1 From 4fafa8e8eedf21cf9aeed56f2b193110696154e2 Mon Sep 17 00:00:00 2001
2 From: David-John Willis <John.Willis@Distant-earth.com>
3 Date: Mon, 21 Dec 2009 21:36:25 +0000
4 Subject: [PATCH 7/7] AUFS2: Add latest AUFS2 in-tree code for 2.6.27.
7 Documentation/ABI/testing/debugfs-aufs | 40 +
8 Documentation/ABI/testing/sysfs-aufs | 25 +
9 Documentation/filesystems/aufs/README | 347 +++++
10 Documentation/filesystems/aufs/design/01intro.txt | 137 ++
11 Documentation/filesystems/aufs/design/02struct.txt | 218 +++
12 Documentation/filesystems/aufs/design/03lookup.txt | 104 ++
13 Documentation/filesystems/aufs/design/04branch.txt | 76 +
14 .../filesystems/aufs/design/05wbr_policy.txt | 65 +
15 .../filesystems/aufs/design/06fmode_exec.txt | 33 +
16 Documentation/filesystems/aufs/design/07mmap.txt | 53 +
17 Documentation/filesystems/aufs/design/08export.txt | 59 +
18 Documentation/filesystems/aufs/design/09shwh.txt | 53 +
19 Documentation/filesystems/aufs/design/99plan.txt | 96 ++
22 fs/aufs/Kconfig | 136 ++
23 fs/aufs/Makefile | 23 +
25 fs/aufs/branch.c | 978 ++++++++++++
26 fs/aufs/branch.h | 219 +++
27 fs/aufs/cpup.c | 1048 +++++++++++++
29 fs/aufs/dbgaufs.c | 331 +++++
30 fs/aufs/dbgaufs.h | 52 +
31 fs/aufs/dcsub.c | 223 +++
32 fs/aufs/dcsub.h | 54 +
33 fs/aufs/debug.c | 431 ++++++
34 fs/aufs/debug.h | 232 +++
35 fs/aufs/dentry.c | 875 +++++++++++
36 fs/aufs/dentry.h | 228 +++
37 fs/aufs/dinfo.c | 367 +++++
38 fs/aufs/dir.c | 579 ++++++++
39 fs/aufs/dir.h | 127 ++
40 fs/aufs/export.c | 745 ++++++++++
41 fs/aufs/f_op.c | 810 ++++++++++
42 fs/aufs/f_op_sp.c | 290 ++++
43 fs/aufs/file.c | 620 ++++++++
44 fs/aufs/file.h | 187 +++
45 fs/aufs/finfo.c | 131 ++
46 fs/aufs/fstype.h | 434 ++++++
47 fs/aufs/hinotify.c | 755 ++++++++++
48 fs/aufs/i_op.c | 875 +++++++++++
49 fs/aufs/i_op_add.c | 658 +++++++++
50 fs/aufs/i_op_del.c | 470 ++++++
51 fs/aufs/i_op_ren.c | 965 ++++++++++++
52 fs/aufs/iinfo.c | 283 ++++
53 fs/aufs/inode.c | 414 ++++++
54 fs/aufs/inode.h | 474 ++++++
55 fs/aufs/ioctl.c | 127 ++
58 fs/aufs/magic.mk | 66 +
59 fs/aufs/module.c | 173 +++
60 fs/aufs/module.h | 78 +
61 fs/aufs/opts.c | 1550 ++++++++++++++++++++
62 fs/aufs/opts.h | 196 +++
63 fs/aufs/plink.c | 429 ++++++
64 fs/aufs/rdu.c | 333 +++++
65 fs/aufs/rwsem.h | 186 +++
66 fs/aufs/sbinfo.c | 211 +++
68 fs/aufs/super.c | 874 +++++++++++
69 fs/aufs/super.h | 361 +++++
70 fs/aufs/sysaufs.c | 104 ++
71 fs/aufs/sysaufs.h | 105 ++
72 fs/aufs/sysfs.c | 210 +++
73 fs/aufs/sysrq.c | 118 ++
74 fs/aufs/vdir.c | 884 +++++++++++
75 fs/aufs/vfsub.c | 660 +++++++++
76 fs/aufs/vfsub.h | 145 ++
77 fs/aufs/wbr_policy.c | 641 ++++++++
78 fs/aufs/whout.c | 1054 +++++++++++++
79 fs/aufs/whout.h | 87 ++
80 fs/aufs/wkq.c | 259 ++++
82 fs/aufs/xino.c | 1199 +++++++++++++++
85 include/linux/Kbuild | 1 +
86 include/linux/aufs_type.h | 195 +++
87 include/linux/namei.h | 3 +
88 include/linux/splice.h | 6 +
89 scripts/basic/hash | Bin 0 -> 6907 bytes
90 83 files changed, 25962 insertions(+), 7 deletions(-)
91 create mode 100644 Documentation/ABI/testing/debugfs-aufs
92 create mode 100644 Documentation/ABI/testing/sysfs-aufs
93 create mode 100644 Documentation/filesystems/aufs/README
94 create mode 100644 Documentation/filesystems/aufs/design/01intro.txt
95 create mode 100644 Documentation/filesystems/aufs/design/02struct.txt
96 create mode 100644 Documentation/filesystems/aufs/design/03lookup.txt
97 create mode 100644 Documentation/filesystems/aufs/design/04branch.txt
98 create mode 100644 Documentation/filesystems/aufs/design/05wbr_policy.txt
99 create mode 100644 Documentation/filesystems/aufs/design/06fmode_exec.txt
100 create mode 100644 Documentation/filesystems/aufs/design/07mmap.txt
101 create mode 100644 Documentation/filesystems/aufs/design/08export.txt
102 create mode 100644 Documentation/filesystems/aufs/design/09shwh.txt
103 create mode 100644 Documentation/filesystems/aufs/design/99plan.txt
104 create mode 100644 fs/aufs/Kconfig
105 create mode 100644 fs/aufs/Makefile
106 create mode 100644 fs/aufs/aufs.h
107 create mode 100644 fs/aufs/branch.c
108 create mode 100644 fs/aufs/branch.h
109 create mode 100644 fs/aufs/cpup.c
110 create mode 100644 fs/aufs/cpup.h
111 create mode 100644 fs/aufs/dbgaufs.c
112 create mode 100644 fs/aufs/dbgaufs.h
113 create mode 100644 fs/aufs/dcsub.c
114 create mode 100644 fs/aufs/dcsub.h
115 create mode 100644 fs/aufs/debug.c
116 create mode 100644 fs/aufs/debug.h
117 create mode 100644 fs/aufs/dentry.c
118 create mode 100644 fs/aufs/dentry.h
119 create mode 100644 fs/aufs/dinfo.c
120 create mode 100644 fs/aufs/dir.c
121 create mode 100644 fs/aufs/dir.h
122 create mode 100644 fs/aufs/export.c
123 create mode 100644 fs/aufs/f_op.c
124 create mode 100644 fs/aufs/f_op_sp.c
125 create mode 100644 fs/aufs/file.c
126 create mode 100644 fs/aufs/file.h
127 create mode 100644 fs/aufs/finfo.c
128 create mode 100644 fs/aufs/fstype.h
129 create mode 100644 fs/aufs/hinotify.c
130 create mode 100644 fs/aufs/i_op.c
131 create mode 100644 fs/aufs/i_op_add.c
132 create mode 100644 fs/aufs/i_op_del.c
133 create mode 100644 fs/aufs/i_op_ren.c
134 create mode 100644 fs/aufs/iinfo.c
135 create mode 100644 fs/aufs/inode.c
136 create mode 100644 fs/aufs/inode.h
137 create mode 100644 fs/aufs/ioctl.c
138 create mode 100644 fs/aufs/loop.c
139 create mode 100644 fs/aufs/loop.h
140 create mode 100644 fs/aufs/magic.mk
141 create mode 100644 fs/aufs/module.c
142 create mode 100644 fs/aufs/module.h
143 create mode 100644 fs/aufs/opts.c
144 create mode 100644 fs/aufs/opts.h
145 create mode 100644 fs/aufs/plink.c
146 create mode 100644 fs/aufs/rdu.c
147 create mode 100644 fs/aufs/rwsem.h
148 create mode 100644 fs/aufs/sbinfo.c
149 create mode 100644 fs/aufs/spl.h
150 create mode 100644 fs/aufs/super.c
151 create mode 100644 fs/aufs/super.h
152 create mode 100644 fs/aufs/sysaufs.c
153 create mode 100644 fs/aufs/sysaufs.h
154 create mode 100644 fs/aufs/sysfs.c
155 create mode 100644 fs/aufs/sysrq.c
156 create mode 100644 fs/aufs/vdir.c
157 create mode 100644 fs/aufs/vfsub.c
158 create mode 100644 fs/aufs/vfsub.h
159 create mode 100644 fs/aufs/wbr_policy.c
160 create mode 100644 fs/aufs/whout.c
161 create mode 100644 fs/aufs/whout.h
162 create mode 100644 fs/aufs/wkq.c
163 create mode 100644 fs/aufs/wkq.h
164 create mode 100644 fs/aufs/xino.c
165 create mode 100644 include/linux/aufs_type.h
166 create mode 100644 scripts/basic/hash
168 diff --git a/Documentation/ABI/testing/debugfs-aufs b/Documentation/ABI/testing/debugfs-aufs
170 index 0000000..4110b94
172 +++ b/Documentation/ABI/testing/debugfs-aufs
174 +What: /debug/aufs/si_<id>/
176 +Contact: J. R. Okajima <hooanon05@yahoo.co.jp>
178 + Under /debug/aufs, a directory named si_<id> is created
179 + per aufs mount, where <id> is a unique id generated
182 +What: /debug/aufs/si_<id>/xib
184 +Contact: J. R. Okajima <hooanon05@yahoo.co.jp>
186 + It shows the consumed blocks by xib (External Inode Number
187 + Bitmap), its block size and file size.
188 + When the aufs mount option 'noxino' is specified, it
189 + will be empty. About XINO files, see
190 + Documentation/filesystems/aufs/aufs.5 in detail.
192 +What: /debug/aufs/si_<id>/xino0, xino1 ... xinoN
194 +Contact: J. R. Okajima <hooanon05@yahoo.co.jp>
196 + It shows the consumed blocks by xino (External Inode Number
197 + Translation Table), its link count, block size and file
199 + When the aufs mount option 'noxino' is specified, it
200 + will be empty. About XINO files, see
201 + Documentation/filesystems/aufs/aufs.5 in detail.
203 +What: /debug/aufs/si_<id>/xigen
205 +Contact: J. R. Okajima <hooanon05@yahoo.co.jp>
207 + It shows the consumed blocks by xigen (External Inode
208 + Generation Table), its block size and file size.
209 + If CONFIG_AUFS_EXPORT is disabled, this entry will not
211 + When the aufs mount option 'noxino' is specified, it
212 + will be empty. About XINO files, see
213 + Documentation/filesystems/aufs/aufs.5 in detail.
214 diff --git a/Documentation/ABI/testing/sysfs-aufs b/Documentation/ABI/testing/sysfs-aufs
216 index 0000000..ca49330
218 +++ b/Documentation/ABI/testing/sysfs-aufs
220 +What: /sys/fs/aufs/si_<id>/
222 +Contact: J. R. Okajima <hooanon05@yahoo.co.jp>
224 + Under /sys/fs/aufs, a directory named si_<id> is created
225 + per aufs mount, where <id> is a unique id generated
228 +What: /sys/fs/aufs/si_<id>/br0, br1 ... brN
230 +Contact: J. R. Okajima <hooanon05@yahoo.co.jp>
232 + It shows the abolute path of a member directory (which
233 + is called branch) in aufs, and its permission.
235 +What: /sys/fs/aufs/si_<id>/xi_path
237 +Contact: J. R. Okajima <hooanon05@yahoo.co.jp>
239 + It shows the abolute path of XINO (External Inode Number
240 + Bitmap, Translation Table and Generation Table) file
241 + even if it is the default path.
242 + When the aufs mount option 'noxino' is specified, it
243 + will be empty. About XINO files, see
244 + Documentation/filesystems/aufs/aufs.5 in detail.
245 diff --git a/Documentation/filesystems/aufs/README b/Documentation/filesystems/aufs/README
247 index 0000000..2fbd3e6
249 +++ b/Documentation/filesystems/aufs/README
252 +Aufs2 -- advanced multi layered unification filesystem version 2
258 +----------------------------------------
259 +In the early days, aufs was entirely re-designed and re-implemented
260 +Unionfs Version 1.x series. After many original ideas, approaches,
261 +improvements and implementations, it becomes totally different from
262 +Unionfs while keeping the basic features.
263 +Recently, Unionfs Version 2.x series begin taking some of the same
264 +approaches to aufs1's.
265 +Unionfs is being developed by Professor Erez Zadok at Stony Brook
266 +University and his team.
268 +This version of AUFS, aufs2 has several purposes.
269 +- to be reviewed easily and widely.
270 +- to make the source files simpler and smaller by dropping several
273 +Through this work, I found some bad things in aufs1 source code and
274 +fixed them. Some of the dropped features will be reverted in the future,
275 +but not all I'm afraid.
276 +Aufs2 supports linux-2.6.27 and later. If you want older kernel version
277 +support, try aufs1 from CVS on SourceForge.
279 +Note: it becomes clear that "Aufs was rejected. Let's give it up."
280 +According to Christoph Hellwig, linux rejects all union-type filesystems
282 +<http://marc.info/?l=linux-kernel&m=123938533724484&w=2>
286 +----------------------------------------
287 +- unite several directories into a single virtual filesystem. The member
288 + directory is called as a branch.
289 +- you can specify the permission flags to the branch, which are 'readonly',
290 + 'readwrite' and 'whiteout-able.'
291 +- by upper writable branch, internal copyup and whiteout, files/dirs on
292 + readonly branch are modifiable logically.
293 +- dynamic branch manipulation, add, del.
296 +Also there are many enhancements in aufs1, such as:
297 +- readdir(3) in userspace.
298 +- keep inode number by external inode number table
299 +- keep the timestamps of file/dir in internal copyup operation
300 +- seekable directory, supporting NFS readdir.
301 +- support mmap(2) including /proc/PID/exe symlink, without page-copy
302 +- whiteout is hardlinked in order to reduce the consumption of inodes
304 +- do not copyup, nor create a whiteout when it is unnecessary
305 +- revert a single systemcall when an error occurs in aufs
306 +- remount interface instead of ioctl
307 +- maintain /etc/mtab by an external command, /sbin/mount.aufs.
308 +- loopback mounted filesystem as a branch
309 +- kernel thread for removing the dir who has a plenty of whiteouts
310 +- support copyup sparse file (a file which has a 'hole' in it)
311 +- default permission flags for branches
312 +- selectable permission flags for ro branch, whether whiteout can
315 +- support <sysfs>/fs/aufs and <debugfs>/aufs.
316 +- support multiple writable branches, some policies to select one
317 + among multiple writable branches.
318 +- a new semantics for link(2) and rename(2) to support multiple
320 +- no glibc changes are required.
321 +- pseudo hardlink (hardlink over branches)
322 +- allow a direct access manually to a file on branch, e.g. bypassing aufs.
323 + including NFS or remote filesystem branch.
324 +- userspace wrapper for pathconf(3)/fpathconf(3) with _PC_LINK_MAX.
327 +Currently these features are dropped temporary from this version, aufs2.
328 +See design/08plan.txt in detail.
329 +- test only the highest one for the directory permission (dirperm1)
330 +- show whiteout mode (shwh)
331 +- copyup on open (coo=)
332 +- nested mount, i.e. aufs as readonly no-whiteout branch of another aufs
334 +- statistics of aufs thread (/sys/fs/aufs/stat)
335 +- delegation mode (dlgt)
336 + a delegation of the internal branch access to support task I/O
337 + accounting, which also supports Linux Security Modules (LSM) mainly
339 +- intent.open/create (file open in a single lookup)
341 +Features or just an idea in the future (see also design/*.txt),
342 +- reorder the branch index without del/re-add.
343 +- permanent xino files for NFSD
344 +- an option for refreshing the opened files after add/del branches
345 +- 'move' policy for copy-up between two writable branches, after
346 + checking free space.
348 +- light version, without branch manipulation. (unnecessary?)
349 +- copyup in userspace
350 +- inotify in userspace
356 +----------------------------------------
357 +Kindly one of aufs user, the Center for Scientific Computing and Free
358 +Software (C3SL), Federal University of Parana offered me a public GIT
361 +There are three GIT trees, aufs2-2.6, aufs2-standalone and aufs2-util.
362 +While the aufs2-util is always necessary, you need either of aufs2-2.6
363 +or aufs2-standalone.
365 +The aufs2-2.6 tree includes the whole linux-2.6 GIT tree,
366 +git://git.kernel.org/.../torvalds/linux-2.6.git.
367 +And you cannot select CONFIG_AUFS_FS=m for this version, eg. you cannot
368 +build aufs2 as an externel kernel module.
369 +If you already have linux-2.6 GIT tree, you may want to pull and merge
370 +the "aufs2" branch from this tree.
372 +On the other hand, the aufs2-standalone tree has only aufs2 source files
373 +and a necessary patch, and you can select CONFIG_AUFS_FS=m. In other
374 +words, the aufs2-standalone tree is generated from aufs2-2.6 tree by,
375 +- extract new files and modifications.
376 +- generate some patch files from modifications.
377 +- generate a ChangeLog file from git-log.
378 +- commit the files newly and no log messages. this is not git-pull.
380 +Both of aufs2-2.6 and aufs2-standalone trees have a branch whose name is
381 +in form of "aufs2-xx" where "xx" represents the linux kernel version,
385 +$ git clone --reference /your/linux-2.6/git/tree \
386 + http://git.c3sl.ufpr.br/pub/scm/aufs/aufs2-2.6.git \
388 +- if you don't have linux-2.6 GIT tree, then remove "--reference ..."
390 +$ git checkout origin/aufs2-xx # for instance, aufs2-27 for linux-2.6.27
391 + # aufs2 (no -xx) for the latest -rc version.
393 +o aufs2-standalone tree
394 +$ git clone http://git.c3sl.ufpr.br/pub/scm/aufs/aufs2-standalone.git \
395 + aufs2-standalone.git
396 +$ cd aufs2-standalone.git
397 +$ git checkout origin/aufs2-xx # for instance, aufs2-27 for linux-2.6.27
398 + # aufs2 (no -xx) for the latest -rc version.
401 +$ git clone http://git.c3sl.ufpr.br/pub/scm/aufs/aufs2-util.git \
404 +- no particular tag/branch currently.
406 +o for advanced users
407 +$ git clone git://git.kernel.org/.../torvalds/linux-2.6.git linux-2.6.git
408 + It will take very long time.
411 +$ git remote add aufs2 http://git.c3sl.ufpr.br/pub/scm/aufs/aufs2-2.6.git
412 +$ git checkout -b aufs2-27 v2.6.27
413 +$ git pull aufs2 aufs2-27
414 + It may take long time again.
415 + Once pulling completes, you've got linux-2.6.27 and aufs2 for it in a
416 + branch named aufs2-27, and you can configure and build it.
420 +$ git checkout -t -b aufs2 master
421 +$ git pull aufs2 aufs2
422 + then you've got the latest linux kernel and the latest aufs2 in a
423 + branch named aufs2, and you can configure and build it.
424 + But aufs is released once a week, so you may meet a compilation error
425 + due to mismatching between the mainline and aufs2.
427 +Or you may want build linux-2.6.xx.yy instead of linux-2.6.xx, then here
428 +is an approach using linux-2.6-stable GIT tree.
430 +$ cd linux-2.6.git/..
431 +$ git clone -q --reference ./linux-2.6.git git://git.kernel.org/.../linux-2.6-stable.git \
432 + linux-2.6-stable.git
433 + It will take very long time.
435 +$ cd linux-2.6-stable.git
436 +$ git remote add aufs2 http://git.c3sl.ufpr.br/pub/scm/aufs/aufs2-2.6.git
437 +$ git checkout -b aufs2-27.1 v2.6.27.1
438 +$ git pull aufs2 aufs2-27
439 + then you've got linux-2.6.27.1 and aufs2 for 2.6.27 in a branch named
440 + aufs2-27.1, and you can configure and build it.
441 + But the changes made by v2.6.xx.yy may conflict with aufs2-xx, since
442 + aufs2-xx is for v2.6.xx only. In this case, you may find some patchces
443 + for v2.6.xx.yy in aufs2-standalone.git#aufs2-xx branch if someone else
444 + have ever requested me to support v2.6.xx.yy and I did it.
446 +You can also check what was changed by pulling aufs2.
447 +$ git diff v2.6.27.1..aufs2-27.1
449 +If you want to check the changed files other than fs/aufs, then try this.
450 +$ git diff v2.6.27.1..aufs2-27.1 |
453 +> /^diff.*aufs/ {new=0}
458 +3. Configuration and Compilation
459 +----------------------------------------
460 +Make sure you have git-checkout'ed the correct branch.
463 +- enable CONFIG_EXPERIMENTAL and CONFIG_AUFS_FS.
464 +- set other aufs configurations if necessary.
466 +For aufs2-standalone tree,
467 +There are several ways to build.
469 +You may feel why aufs2-standalone.patch needs to export so many kernel
470 +symbols. Because you selected aufs2-standalone tree instead of aufs2-2.6
471 +tree. The number of necessary symbols to export essentially is zero.
472 +All other symbols are for the external module.
473 +If you don't like aufs2-standalone.patch, then try aufs2-2.6 tree.
476 +- apply ./aufs2-kbuild.patch to your kernel source files.
477 +- apply ./aufs2-base.patch too.
478 +- apply ./aufs2-standalone.patch too, if you have a plan to set
479 + CONFIG_AUFS_FS=m. otherwise you don't need ./aufs2-standalone.patch.
480 +- copy ./{Documentation,fs,include} files to your kernel source tree.
481 +- enable CONFIG_EXPERIMENTAL and CONFIG_AUFS_FS, you can select either
483 +- and build your kernel as usual.
484 +- install it and reboot your system.
487 +- module only (CONFIG_AUFS_FS=m).
488 +- apply ./aufs2-base.patch to your kernel source files.
489 +- apply ./aufs2-standalone.patch too.
490 +- build your kernel and reboot.
491 +- edit ./config.mk and set other aufs configurations if necessary.
492 + Note: You should read ./fs/aufs/Kconfig carefully which describes
493 + every aufs configurations.
494 +- build the module by simple "make".
495 +- you can specify ${KDIR} make variable which points to your kernel
497 +- copy the build ./aufs.ko to /lib/modules/..., and run depmod -a (or
499 +- no need to apply aufs2-kbuild.patch, nor copying source files to your
500 + kernel source tree.
503 +- read README in aufs2-util, build and install it
504 +- if you want to use readdir(3) in userspace or pathconf(3) wrapper,
505 + then run "make install_ulib" too. And refer to the aufs manual in
510 +----------------------------------------
511 +At first, make sure aufs2-util are installed, and please read the aufs
512 +manual, aufs.5 in aufs2-util.git tree.
516 +$ mkdir /tmp/rw /tmp/aufs
517 +# mount -t aufs -o br=/tmp/rw:${HOME} none /tmp/aufs
519 +Here is another example. The result is equivalent.
520 +# mount -t aufs -o br=/tmp/rw=rw:${HOME}=ro none /tmp/aufs
522 +# mount -t aufs -o br:/tmp/rw none /tmp/aufs
523 +# mount -o remount,append:${HOME} /tmp/aufs
525 +Then, you can see whole tree of your home dir through /tmp/aufs. If
526 +you modify a file under /tmp/aufs, the one on your home directory is
527 +not affected, instead the same named file will be newly created under
528 +/tmp/rw. And all of your modification to a file will be applied to
529 +the one under /tmp/rw. This is called the file based Copy on Write
531 +Aufs mount options are described in aufs.5.
533 +Additionally, there are some sample usages of aufs which are a
534 +diskless system with network booting, and LiveCD over NFS.
535 +See sample dir in CVS tree on SourceForge.
539 +----------------------------------------
540 +When you have any problems or strange behaviour in aufs, please let me
542 +- /proc/mounts (instead of the output of mount(8))
543 +- /sys/module/aufs/*
544 +- /sys/fs/aufs/* (if you have them)
545 +- /debug/aufs/* (if you have them)
546 +- linux kernel version
547 + if your kernel is not plain, for example modified by distributor,
548 + the url where i can download its source is necessary too.
549 +- aufs version which was printed at loading the module or booting the
550 + system, instead of the date you downloaded.
551 +- configuration (define/undefine CONFIG_AUFS_xxx)
552 +- kernel configuration or /proc/config.gz (if you have it)
553 +- behaviour which you think to be incorrect
554 +- actual operation, reproducible one is better
555 +- mailto: aufs-users at lists.sourceforge.net
557 +Usually, I don't watch the Public Areas(Bugs, Support Requests, Patches,
558 +and Feature Requests) on SourceForge. Please join and write to
563 +----------------------------------------
564 +Thanks to everyone who have tried and are using aufs, whoever
565 +have reported a bug or any feedback.
568 +Tomas Matejicek(slax.org) made a donation (much more than once).
569 +Dai Itasaka made a donation (2007/8).
570 +Chuck Smith made a donation (2008/4, 10 and 12).
571 +Henk Schoneveld made a donation (2008/9).
572 +Chih-Wei Huang, ASUS, CTC donated Eee PC 4G (2008/10).
573 +Francois Dupoux made a donation (2008/11).
574 +Bruno Cesar Ribas and Luis Carlos Erpen de Bona, C3SL serves public
575 +aufs2 GIT tree (2009/2).
576 +William Grant made a donation (2009/3).
577 +Patrick Lane made a donation (2009/4).
578 +The Mail Archive (mail-archive.com) made donations (2009/5).
579 +Nippy Networks (Ed Wildgoose) made a donation (2009/7).
580 +New Dream Network, LLC (www.dreamhost.com) made a donation (2009/11).
582 +Thank you very much.
583 +Donations are always, including future donations, very important and
584 +helpful for me to keep on developing aufs.
588 +----------------------------------------
589 +If you are an experienced user, no explanation is needed. Aufs is
590 +just a linux filesystem.
595 +# Local variables: ;
598 diff --git a/Documentation/filesystems/aufs/design/01intro.txt b/Documentation/filesystems/aufs/design/01intro.txt
600 index 0000000..ac678c0
602 +++ b/Documentation/filesystems/aufs/design/01intro.txt
605 +# Copyright (C) 2005-2009 Junjiro R. Okajima
607 +# This program is free software; you can redistribute it and/or modify
608 +# it under the terms of the GNU General Public License as published by
609 +# the Free Software Foundation; either version 2 of the License, or
610 +# (at your option) any later version.
612 +# This program is distributed in the hope that it will be useful,
613 +# but WITHOUT ANY WARRANTY; without even the implied warranty of
614 +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
615 +# GNU General Public License for more details.
617 +# You should have received a copy of the GNU General Public License
618 +# along with this program; if not, write to the Free Software
619 +# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
622 +----------------------------------------
624 +aufs [ei ju: ef es] | [a u f s]
625 +1. abbrev. for "advanced multi-layered unification filesystem".
626 +2. abbrev. for "another unionfs".
627 +3. abbrev. for "auf das" in German which means "on the" in English.
628 + Ex. "Butter aufs Brot"(G) means "butter onto bread"(E).
629 + But "Filesystem aufs Filesystem" is hard to understand.
631 +AUFS is a filesystem with features:
632 +- multi layered stackable unification filesystem, the member directory
633 + is called as a branch.
634 +- branch permission and attribute, 'readonly', 'real-readonly',
635 + 'readwrite', 'whiteout-able', 'link-able whiteout' and their
637 +- internal "file copy-on-write".
638 +- logical deletion, whiteout.
639 +- dynamic branch manipulation, adding, deleting and changing permission.
640 +- allow bypassing aufs, user's direct branch access.
641 +- external inode number translation table and bitmap which maintains the
642 + persistent aufs inode number.
643 +- seekable directory, including NFS readdir.
644 +- file mapping, mmap and sharing pages.
645 +- pseudo-link, hardlink over branches.
646 +- loopback mounted filesystem as a branch.
647 +- several policies to select one among multiple writable branches.
648 +- revert a single systemcall when an error occurs in aufs.
652 +Multi Layered Stackable Unification Filesystem
653 +----------------------------------------------------------------------
654 +Most people already knows what it is.
655 +It is a filesystem which unifies several directories and provides a
656 +merged single directory. When users access a file, the access will be
657 +passed/re-directed/converted (sorry, I am not sure which English word is
658 +correct) to the real file on the member filesystem. The member
659 +filesystem is called 'lower filesystem' or 'branch' and has a mode
660 +'readonly' and 'readwrite.' And the deletion for a file on the lower
661 +readonly branch is handled by creating 'whiteout' on the upper writable
664 +On LKML, there have been discussions about UnionMount (Jan Blunck and
665 +Bharata B Rao) and Unionfs (Erez Zadok). They took different approaches
666 +to implement the merged-view.
667 +The former tries putting it into VFS, and the latter implements as a
668 +separate filesystem.
669 +(If I misunderstand about these implementations, please let me know and
670 +I shall correct it. Because it is a long time ago when I read their
671 +source files last time).
672 +UnionMount's approach will be able to small, but may be hard to share
673 +branches between several UnionMount since the whiteout in it is
674 +implemented in the inode on branch filesystem and always
675 +shared. According to Bharata's post, readdir does not seems to be
677 +Unionfs has a longer history. When I started implementing a stacking filesystem
678 +(Aug 2005), it already existed. It has virtual super_block, inode,
679 +dentry and file objects and they have an array pointing lower same kind
680 +objects. After contributing many patches for Unionfs, I re-started my
681 +project AUFS (Jun 2006).
683 +In AUFS, the structure of filesystem resembles to Unionfs, but I
684 +implemented my own ideas, approaches and enhancements and it became
685 +totally different one.
688 +Several characters/aspects of aufs
689 +----------------------------------------------------------------------
691 +Aufs has several characters or aspects.
692 +1. a filesystem, callee of VFS helper
693 +2. sub-VFS, caller of VFS helper for branches
694 +3. a virtual filesystem which maintains persistent inode number
695 +4. reader/writer of files on branches such like an application
697 +1. Caller of VFS Helper
698 +As an ordinary linux filesystem, aufs is a callee of VFS. For instance,
699 +unlink(2) from an application reaches sys_unlink() kernel function and
700 +then vfs_unlink() is called. vfs_unlink() is one of VFS helper and it
701 +calls filesystem specific unlink operation. Actually aufs implements the
702 +unlink operation but it behaves like a redirector.
704 +2. Caller of VFS Helper for Branches
705 +aufs_unlink() passes the unlink request to the branch filesystem as if
706 +it were called from VFS. So the called unlink operation of the branch
707 +filesystem acts as usual. As a caller of VFS helper, aufs should handle
708 +every necessary pre/post operation for the branch filesystem.
709 +- acquire the lock for the parent dir on a branch
710 +- lookup in a branch
711 +- revalidate dentry on a branch
712 +- mnt_want_write() for a branch
713 +- vfs_unlink() for a branch
714 +- mnt_drop_write() for a branch
715 +- release the lock on a branch
717 +3. Persistent Inode Number
718 +One of the most important issue for a filesystem is to maintain inode
719 +numbers. This is particularly important to support exporting a
720 +filesystem via NFS. Aufs is a virtual filesystem which doesn't have a
721 +backend block device for its own. But some storage is necessary to
722 +maintain inode number. It may be a large space and may not suit to keep
723 +in memory. Aufs rents some space from its first writable branch
724 +filesystem (by default) and creates file(s) on it. These files are
725 +created by aufs internally and removed soon (currently) keeping opened.
726 +Note: Because these files are removed, they are totally gone after
727 + unmounting aufs. It means the inode numbers are not persistent
728 + across unmount or reboot. I have a plan to make them really
729 + persistent which will be important for aufs on NFS server.
731 +4. Read/Write Files Internally (copy-on-write)
732 +Because a branch can be readonly, when you write a file on it, aufs will
733 +"copy-up" it to the upper writable branch internally. And then write the
734 +originally requested thing to the file. Generally kernel doesn't
735 +open/read/write file actively. In aufs, even a single write may cause a
736 +internal "file copy". This behaviour is very similar to cp(1) command.
738 +Some people may think it is better to pass such work to user space
739 +helper, instead of doing in kernel space. Actually I am still thinking
740 +about it. But currently I have implemented it in kernel space.
741 diff --git a/Documentation/filesystems/aufs/design/02struct.txt b/Documentation/filesystems/aufs/design/02struct.txt
743 index 0000000..11cee07
745 +++ b/Documentation/filesystems/aufs/design/02struct.txt
748 +# Copyright (C) 2005-2009 Junjiro R. Okajima
750 +# This program is free software; you can redistribute it and/or modify
751 +# it under the terms of the GNU General Public License as published by
752 +# the Free Software Foundation; either version 2 of the License, or
753 +# (at your option) any later version.
755 +# This program is distributed in the hope that it will be useful,
756 +# but WITHOUT ANY WARRANTY; without even the implied warranty of
757 +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
758 +# GNU General Public License for more details.
760 +# You should have received a copy of the GNU General Public License
761 +# along with this program; if not, write to the Free Software
762 +# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
764 +Basic Aufs Internal Structure
766 +Superblock/Inode/Dentry/File Objects
767 +----------------------------------------------------------------------
768 +As like an ordinary filesystem, aufs has its own
769 +superblock/inode/dentry/file objects. All these objects have a
770 +dynamically allocated array and store the same kind of pointers to the
771 +lower filesystem, branch.
772 +For example, when you build a union with one readwrite branch and one
773 +readonly, mounted /au, /rw and /ro respectively.
775 +- /ro/fileA exists but /rw/fileA
777 +Aufs lookup operation finds /ro/fileA and gets dentry for that. These
778 +pointers are stored in a aufs dentry. The array in aufs dentry will be,
782 +This style of an array is essentially same to the aufs
783 +superblock/inode/dentry/file objects.
785 +Because aufs supports manipulating branches, ie. add/delete/change
786 +dynamically, these objects has its own generation. When branches are
787 +changed, the generation in aufs superblock is incremented. And a
788 +generation in other object are compared when it is accessed.
789 +When a generation in other objects are obsoleted, aufs refreshes the
794 +----------------------------------------------------------------------
795 +Additionally aufs superblock has some data for policies to select one
796 +among multiple writable branches, XIB files, pseudo-links and kobject.
797 +See below in detail.
798 +About the policies which supports copy-down a directory, see policy.txt
802 +Branch and XINO(External Inode Number Translation Table)
803 +----------------------------------------------------------------------
804 +Every branch has its own xino (external inode number translation table)
805 +file. The xino file is created and unlinked by aufs internally. When two
806 +members of a union exist on the same filesystem, they share the single
808 +The struct of a xino file is simple, just a sequence of aufs inode
809 +numbers which is indexed by the lower inode number.
810 +In the above sample, assume the inode number of /ro/fileA is i111 and
811 +aufs assigns the inode number i999 for fileA. Then aufs writes 999 as
812 +4(8) bytes at 111 * 4(8) bytes offset in the xino file.
814 +When the inode numbers are not contiguous, the xino file will be sparse
815 +which has a hole in it and doesn't consume as much disk space as it
816 +might appear. If your branch filesystem consumes disk space for such
817 +holes, then you should specify 'xino=' option at mounting aufs.
819 +Also a writable branch has three kinds of "whiteout bases". All these
820 +are existed when the branch is joined to aufs and the names are
821 +whiteout-ed doubly, so that users will never see their names in aufs
823 +1. a regular file which will be linked to all whiteouts.
824 +2. a directory to store a pseudo-link.
825 +3. a directory to store an "orphan-ed" file temporary.
828 + When you remove a file on a readonly branch, aufs handles it as a
829 + logical deletion and creates a whiteout on the upper writable branch
830 + as a hardlink of this file in order not to consume inode on the
833 + See below, Pseudo-link.
835 + When "fileC" exists on the lower readonly branch only and it is
836 + opened and removed with its parent dir, and then user writes
837 + something into it, then aufs copies-up fileC to this
838 + directory. Because there is no other dir to store fileC. After
839 + creating a file under this dir, the file is unlinked.
841 +Because aufs supports manipulating branches, ie. add/delete/change
842 +dynamically, a branch has its own id. When the branch order changes, aufs
843 +finds the new index by searching the branch id.
847 +----------------------------------------------------------------------
848 +Assume "fileA" exists on the lower readonly branch only and it is
849 +hardlinked to "fileB" on the branch. When you write something to fileA,
850 +aufs copies-up it to the upper writable branch. Additionally aufs
851 +creates a hardlink under the Pseudo-link Directory of the writable
852 +branch. The inode of a pseudo-link is kept in aufs super_block as a
853 +simple list. If fileB is read after unlinking fileA, aufs returns
854 +filedata from the pseudo-link instead of the lower readonly
855 +branch. Because the pseudo-link is based upon the inode, to keep the
856 +inode number by xino (see above) is important.
858 +All the hardlinks under the Pseudo-link Directory of the writable branch
859 +should be restored in a proper location later. Aufs provides a utility
860 +to do this. The userspace helpers executed at remounting and unmounting
864 +XIB(external inode number bitmap)
865 +----------------------------------------------------------------------
866 +Addition to the xino file per a branch, aufs has an external inode number
867 +bitmap in a superblock object. It is also a file such like a xino file.
868 +It is a simple bitmap to mark whether the aufs inode number is in-use or
870 +To reduce the file I/O, aufs prepares a single memory page to cache xib.
872 +Aufs implements a feature to truncate/refresh both of xino and xib to
873 +reduce the number of consumed disk blocks for these files.
876 +Virtual or Vertical Dir
877 +----------------------------------------------------------------------
878 +In order to support multiple layers (branches), aufs readdir operation
879 +constructs a virtual dir block on memory. For readdir, aufs calls
880 +vfs_readdir() internally for each dir on branches, merges their entries
881 +with eliminating the whiteout-ed ones, and sets it to file (dir)
882 +object. So the file object has its entry list until it is closed. The
883 +entry list will be updated when the file position is zero and becomes
884 +old. This decision is made in aufs automatically.
886 +The dynamically allocated memory block for the name of entries has a
887 +unit of 512 bytes (by default) and stores the names contiguously (no
888 +padding). Another block for each entry is handled by kmem_cache too.
889 +During building dir blocks, aufs creates hash list and judging whether
890 +the entry is whiteouted by its upper branch or already listed.
892 +Some people may call it can be a security hole or invite DoS attack
893 +since the opened and once readdir-ed dir (file object) holds its entry
894 +list and becomes a pressure for system memory. But I'd say it is similar
895 +to files under /proc or /sys. The virtual files in them also holds a
896 +memory page (generally) while they are opened. When an idea to reduce
897 +memory for them is introduced, it will be applied to aufs too.
898 +For those who really hate this situation, I've developed readdir(3)
899 +library which operates this merging in userspace. You just need to set
900 +LD_PRELOAD environment variable, and aufs will not consume no memory in
901 +kernel space for readdir(3).
905 +----------------------------------------------------------------------
906 +Aufs sometimes requires privilege access to a branch. For instance,
907 +in copy-up/down operation. When a user process is going to make changes
908 +to a file which exists in the lower readonly branch only, and the mode
909 +of one of ancestor directories may not be writable by a user
910 +process. Here aufs copy-up the file with its ancestors and they may
911 +require privilege to set its owner/group/mode/etc.
912 +This is a typical case of a application character of aufs (see
915 +Aufs uses workqueue synchronously for this case. It creates its own
916 +workqueue. The workqueue is a kernel thread and has privilege. Aufs
917 +passes the request to call mkdir or write (for example), and wait for
918 +its completion. This approach solves a problem of a signal handler
920 +If aufs didn't adopt the workqueue and changed the privilege of the
921 +process, and if the mkdir/write call arises SIGXFSZ or other signal,
922 +then the user process might gain a privilege or the generated core file
923 +was owned by a superuser. But I have a plan to switch to a new
924 +credential approach which will be introduced in linux-2.6.29.
926 +Also aufs uses the system global workqueue ("events" kernel thread) too
927 +for asynchronous tasks, such like handling inotify, re-creating a
928 +whiteout base and etc. This is unrelated to a privilege.
929 +Most of aufs operation tries acquiring a rw_semaphore for aufs
930 +superblock at the beginning, at the same time waits for the completion
931 +of all queued asynchronous tasks.
935 +----------------------------------------------------------------------
936 +The whiteout in aufs is very similar to Unionfs's. That is represented
937 +by its filename. UnionMount takes an approach of a file mode, but I am
938 +afraid several utilities (find(1) or something) will have to support it.
940 +Basically the whiteout represents "logical deletion" which stops aufs to
941 +lookup further, but also it represents "dir is opaque" which also stop
944 +In aufs, rmdir(2) and rename(2) for dir uses whiteout alternatively.
945 +In order to make several functions in a single systemcall to be
946 +revertible, aufs adopts an approach to rename a directory to a temporary
947 +unique whiteouted name.
948 +For example, in rename(2) dir where the target dir already existed, aufs
949 +renames the target dir to a temporary unique whiteouted name before the
950 +actual rename on a branch and then handles other actions (make it opaque,
951 +update the attributes, etc). If an error happens in these actions, aufs
952 +simply renames the whiteouted name back and returns an error. If all are
953 +succeeded, aufs registers a function to remove the whiteouted unique
954 +temporary name completely and asynchronously to the system global
959 +----------------------------------------------------------------------
960 +It is a well-known feature or concept.
961 +When user modifies a file on a readonly branch, aufs operate "copy-up"
962 +internally and makes change to the new file on the upper writable branch.
963 +When the trigger systemcall does not update the timestamps of the parent
964 +dir, aufs reverts it after copy-up.
965 diff --git a/Documentation/filesystems/aufs/design/03lookup.txt b/Documentation/filesystems/aufs/design/03lookup.txt
967 index 0000000..7510fdb
969 +++ b/Documentation/filesystems/aufs/design/03lookup.txt
972 +# Copyright (C) 2005-2009 Junjiro R. Okajima
974 +# This program is free software; you can redistribute it and/or modify
975 +# it under the terms of the GNU General Public License as published by
976 +# the Free Software Foundation; either version 2 of the License, or
977 +# (at your option) any later version.
979 +# This program is distributed in the hope that it will be useful,
980 +# but WITHOUT ANY WARRANTY; without even the implied warranty of
981 +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
982 +# GNU General Public License for more details.
984 +# You should have received a copy of the GNU General Public License
985 +# along with this program; if not, write to the Free Software
986 +# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
989 +----------------------------------------------------------------------
990 +Since aufs has a character of sub-VFS (see Introduction), it operates
991 +lookup for branches as VFS does. It may be a heavy work. Generally
992 +speaking struct nameidata is a bigger structure and includes many
993 +information. But almost all lookup operation in aufs is the simplest
994 +case, ie. lookup only an entry directly connected to its parent. Digging
995 +down the directory hierarchy is unnecessary.
997 +VFS has a function lookup_one_len() for that use, but it is not usable
998 +for a branch filesystem which requires struct nameidata. So aufs
999 +implements a simple lookup wrapper function. When a branch filesystem
1000 +allows NULL as nameidata, it calls lookup_one_len(). Otherwise it builds
1001 +a simplest nameidata and calls lookup_hash().
1002 +Here aufs applies "a principle in NFSD", ie. if the filesystem supports
1003 +NFS-export, then it has to support NULL as a nameidata parameter for
1004 +->create(), ->lookup() and ->d_revalidate(). So the lookup wrapper in
1005 +aufs tests if ->s_export_op in the branch is NULL or not.
1007 +When a branch is a remote filesystem, aufs trusts its ->d_revalidate().
1008 +For d_revalidate, aufs implements three levels of revalidate tests. See
1009 +"Revalidate Dentry and UDBA" in detail.
1013 +----------------------------------------------------------------------
1014 +Basically aufs supports any type of filesystem and block device for a
1015 +branch (actually there are some exceptions). But it is prohibited to add
1016 +a loopback mounted one whose backend file exists in a filesystem which is
1017 +already added to aufs. The reason is to protect aufs from a recursive
1018 +lookup. If it was allowed, the aufs lookup operation might re-enter a
1019 +lookup for the loopback mounted branch in the same context, and will
1023 +Revalidate Dentry and UDBA (User's Direct Branch Access)
1024 +----------------------------------------------------------------------
1025 +Generally VFS helpers re-validate a dentry as a part of lookup.
1026 +0. digging down the directory hierarchy.
1027 +1. lock the parent dir by its i_mutex.
1028 +2. lookup the final (child) entry.
1030 +4. call the actual operation (create, unlink, etc.)
1031 +5. unlock the parent dir
1033 +If the filesystem implements its ->d_revalidate() (step 3), then it is
1034 +called. Actually aufs implements it and checks the dentry on a branch is
1036 +But it is not enough. Because aufs has to release the lock for the
1037 +parent dir on a branch at the end of ->lookup() (step 2) and
1038 +->d_revalidate() (step 3) while the i_mutex of the aufs dir is still
1040 +If the file on a branch is changed directly, eg. bypassing aufs, after
1041 +aufs released the lock, then the subsequent operation may cause
1042 +something unpleasant result.
1044 +This situation is a result of VFS architecture, ->lookup() and
1045 +->d_revalidate() is separated. But I never say it is wrong. It is a good
1046 +design from VFS's point of view. It is just not suitable for sub-VFS
1049 +Aufs supports such case by three level of revalidation which is
1050 +selectable by user.
1051 +1. Simple Revalidate
1052 + Addition to the native flow in VFS's, confirm the child-parent
1053 + relationship on the branch just after locking the parent dir on the
1054 + branch in the "actual operation" (step 4). When this validation
1055 + fails, aufs returns EBUSY. ->d_revalidate() (step 3) in aufs still
1056 + checks the validation of the dentry on branches.
1057 +2. Monitor Changes Internally by Inotify
1058 + Addition to above, in the "actual operation" (step 4) aufs re-lookup
1059 + the dentry on the branch, and returns EBUSY if it finds different
1061 + Additionally, aufs sets the inotify watch for every dir on branches
1062 + during it is in cache. When the event is notified, aufs registers a
1063 + function to kernel 'events' thread by schedule_work(). And the
1064 + function sets some special status to the cached aufs dentry and inode
1065 + private data. If they are not cached, then aufs has nothing to
1066 + do. When the same file is accessed through aufs (step 0-3) later,
1067 + aufs will detect the status and refresh all necessary data.
1068 + In this mode, aufs has to ignore the event which is fired by aufs
1070 +3. No Extra Validation
1071 + This is the simplest test and doesn't add any additional revalidation
1072 + test, and skip therevalidatin in step 4. It is useful and improves
1073 + aufs performance when system surely hide the aufs branches from user,
1074 + by over-mounting something (or another method).
1075 diff --git a/Documentation/filesystems/aufs/design/04branch.txt b/Documentation/filesystems/aufs/design/04branch.txt
1076 new file mode 100644
1077 index 0000000..5529d6a
1079 +++ b/Documentation/filesystems/aufs/design/04branch.txt
1082 +# Copyright (C) 2005-2009 Junjiro R. Okajima
1084 +# This program is free software; you can redistribute it and/or modify
1085 +# it under the terms of the GNU General Public License as published by
1086 +# the Free Software Foundation; either version 2 of the License, or
1087 +# (at your option) any later version.
1089 +# This program is distributed in the hope that it will be useful,
1090 +# but WITHOUT ANY WARRANTY; without even the implied warranty of
1091 +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
1092 +# GNU General Public License for more details.
1094 +# You should have received a copy of the GNU General Public License
1095 +# along with this program; if not, write to the Free Software
1096 +# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
1098 +Branch Manipulation
1100 +Since aufs supports dynamic branch manipulation, ie. add/remove a branch
1101 +and changing its permission/attribute, there are a lot of works to do.
1105 +----------------------------------------------------------------------
1106 +o Confirm the adding dir exists outside of aufs, including loopback
1108 +- and other various attributes...
1109 +o Initialize the xino file and whiteout bases if necessary.
1112 +o Check the owner/group/mode of the directory
1113 + When the owner/group/mode of the adding directory differs from the
1114 + existing branch, aufs issues a warning because it may impose a
1116 + For example, when a upper writable branch has a world writable empty
1117 + top directory, a malicious user can create any files on the writable
1118 + branch directly, like copy-up and modify manually. If something like
1119 + /etc/{passwd,shadow} exists on the lower readonly branch but the upper
1120 + writable branch, and the writable branch is world-writable, then a
1121 + malicious guy may create /etc/passwd on the writable branch directly
1122 + and the infected file will be valid in aufs.
1123 + I am afraid it can be a security issue, but nothing to do except
1124 + producing a warning.
1128 +----------------------------------------------------------------------
1129 +o Confirm the deleting branch is not busy
1130 + To be general, there is one merit to adopt "remount" interface to
1131 + manipulate branches. It is to discard caches. At deleting a branch,
1132 + aufs checks the still cached (and connected) dentries and inodes. If
1133 + there are any, then they are all in-use. An inode without its
1134 + corresponding dentry can be alive alone (for example, inotify case).
1136 + For the cached one, aufs checks whether the same named entry exists on
1138 + If the cached one is a directory, because aufs provides a merged view
1139 + to users, as long as one dir is left on any branch aufs can show the
1140 + dir to users. In this case, the branch can be removed from aufs.
1141 + Otherwise aufs rejects deleting the branch.
1143 + If any file on the deleting branch is opened by aufs, then aufs
1147 +Modify the Permission of a Branch
1148 +----------------------------------------------------------------------
1149 +o Re-initialize or remove the xino file and whiteout bases if necessary.
1152 +o rw --> ro: Confirm the modifying branch is not busy
1153 + Aufs rejects the request if any of these conditions are true.
1154 + - a file on the branch is mmap-ed.
1155 + - a regular file on the branch is opened for write and there is no
1156 + same named entry on the upper branch.
1157 diff --git a/Documentation/filesystems/aufs/design/05wbr_policy.txt b/Documentation/filesystems/aufs/design/05wbr_policy.txt
1158 new file mode 100644
1159 index 0000000..5f25684
1161 +++ b/Documentation/filesystems/aufs/design/05wbr_policy.txt
1164 +# Copyright (C) 2005-2009 Junjiro R. Okajima
1166 +# This program is free software; you can redistribute it and/or modify
1167 +# it under the terms of the GNU General Public License as published by
1168 +# the Free Software Foundation; either version 2 of the License, or
1169 +# (at your option) any later version.
1171 +# This program is distributed in the hope that it will be useful,
1172 +# but WITHOUT ANY WARRANTY; without even the implied warranty of
1173 +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
1174 +# GNU General Public License for more details.
1176 +# You should have received a copy of the GNU General Public License
1177 +# along with this program; if not, write to the Free Software
1178 +# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
1180 +Policies to Select One among Multiple Writable Branches
1181 +----------------------------------------------------------------------
1182 +When the number of writable branch is more than one, aufs has to decide
1183 +the target branch for file creation or copy-up. By default, the highest
1184 +writable branch which has the parent (or ancestor) dir of the target
1185 +file is chosen (top-down-parent policy).
1186 +By user's request, aufs implements some other policies to select the
1187 +writable branch, for file creation two policies, round-robin and
1188 +most-free-space policies. For copy-up three policies, top-down-parent,
1189 +bottom-up-parent and bottom-up policies.
1191 +As expected, the round-robin policy selects the branch in circular. When
1192 +you have two writable branches and creates 10 new files, 5 files will be
1193 +created for each branch. mkdir(2) systemcall is an exception. When you
1194 +create 10 new directories, all will be created on the same branch.
1195 +And the most-free-space policy selects the one which has most free
1196 +space among the writable branches. The amount of free space will be
1197 +checked by aufs internally, and users can specify its time interval.
1199 +The policies for copy-up is more simple,
1200 +top-down-parent is equivalent to the same named on in create policy,
1201 +bottom-up-parent selects the writable branch where the parent dir
1202 +exists and the nearest upper one from the copyup-source,
1203 +bottom-up selects the nearest upper writable branch from the
1204 +copyup-source, regardless the existence of the parent dir.
1206 +There are some rules or exceptions to apply these policies.
1207 +- If there is a readonly branch above the policy-selected branch and
1208 + the parent dir is marked as opaque (a variation of whiteout), or the
1209 + target (creating) file is whiteout-ed on the upper readonly branch,
1210 + then the result of the policy is ignored and the target file will be
1211 + created on the nearest upper writable branch than the readonly branch.
1212 +- If there is a writable branch above the policy-selected branch and
1213 + the parent dir is marked as opaque or the target file is whiteouted
1214 + on the branch, then the result of the policy is ignored and the target
1215 + file will be created on the highest one among the upper writable
1216 + branches who has diropq or whiteout. In case of whiteout, aufs removes
1218 +- link(2) and rename(2) systemcalls are exceptions in every policy.
1219 + They try selecting the branch where the source exists as possible
1220 + since copyup a large file will take long time. If it can't be,
1221 + ie. the branch where the source exists is readonly, then they will
1222 + follow the copyup policy.
1223 +- There is an exception for rename(2) when the target exists.
1224 + If the rename target exists, aufs compares the index of the branches
1225 + where the source and the target exists and selects the higher
1226 + one. If the selected branch is readonly, then aufs follows the
1228 diff --git a/Documentation/filesystems/aufs/design/06fmode_exec.txt b/Documentation/filesystems/aufs/design/06fmode_exec.txt
1229 new file mode 100644
1230 index 0000000..ebc311d
1232 +++ b/Documentation/filesystems/aufs/design/06fmode_exec.txt
1235 +# Copyright (C) 2005-2009 Junjiro R. Okajima
1237 +# This program is free software; you can redistribute it and/or modify
1238 +# it under the terms of the GNU General Public License as published by
1239 +# the Free Software Foundation; either version 2 of the License, or
1240 +# (at your option) any later version.
1242 +# This program is distributed in the hope that it will be useful,
1243 +# but WITHOUT ANY WARRANTY; without even the implied warranty of
1244 +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
1245 +# GNU General Public License for more details.
1247 +# You should have received a copy of the GNU General Public License
1248 +# along with this program; if not, write to the Free Software
1249 +# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
1251 +FMODE_EXEC and deny_write()
1252 +----------------------------------------------------------------------
1253 +Generally Unix prevents an executing file from writing its filedata.
1254 +In linux it is implemented by deny_write() and allow_write().
1255 +When a file is executed by exec() family, open_exec() (and sys_uselib())
1256 +they opens the file and calls deny_write(). If the file is aufs's virtual
1257 +one, it has no meaning. The file which deny_write() is really necessary
1258 +is the file on a branch. But the FMODE_EXEC flag is not passed to
1259 +->open() operation. So aufs adopt a dirty trick.
1261 +- in order to get FMODE_EXEC, aufs ->lookup() and ->d_revalidate() set
1262 + nd->intent.open.file->private_data to nd->intent.open.flags temporary.
1263 +- in aufs ->open(), when FMODE_EXEC is set in file->private_data, it
1264 + calls deny_write() for the file on a branch.
1265 +- when the aufs file is released, allow_write() for the file on a branch
1267 diff --git a/Documentation/filesystems/aufs/design/07mmap.txt b/Documentation/filesystems/aufs/design/07mmap.txt
1268 new file mode 100644
1269 index 0000000..5d60fb9
1271 +++ b/Documentation/filesystems/aufs/design/07mmap.txt
1274 +# Copyright (C) 2005-2009 Junjiro R. Okajima
1276 +# This program is free software; you can redistribute it and/or modify
1277 +# it under the terms of the GNU General Public License as published by
1278 +# the Free Software Foundation; either version 2 of the License, or
1279 +# (at your option) any later version.
1281 +# This program is distributed in the hope that it will be useful,
1282 +# but WITHOUT ANY WARRANTY; without even the implied warranty of
1283 +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
1284 +# GNU General Public License for more details.
1286 +# You should have received a copy of the GNU General Public License
1287 +# along with this program; if not, write to the Free Software
1288 +# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
1290 +mmap(2) -- File Memory Mapping
1291 +----------------------------------------------------------------------
1292 +In aufs, the file-mapped pages are shared between the file on a branch
1293 +and the virtual one in aufs by overriding vm_operation, particularly
1297 +- get and store vm_ops of the real file on a branch.
1298 +- map the file of aufs by generic_file_mmap() and set aufs's vm
1302 +- get the file of aufs from the passed vma, sleep if needed.
1303 +- get the real file on a branch from the aufs file.
1304 +- a race may happen. for instance a multithreaded library. so some lock
1306 +- call ->fault() in the previously stored vm_ops with setting the
1307 + real file on a branch to vm_file.
1308 +- restore vm_file and wake_up if someone else got sleep.
1310 +When a branch is added to or deleted from aufs, the same-named file may
1311 +unveil and its contents will be replaced by the new one when a process
1312 +read(2) through previously opened file.
1313 +(Some users may not want to refresh the filedata. For such users, I
1314 +have a plan to implement a mount option 'refrof' which decides to
1315 +refresh the opened files or not. See plan.txt too.)
1316 +In this case, an already mapped file will not be updated since the
1317 +contents are a part of a process already and it should not be changed by
1318 +aufs branch manipulation. (Even if MAP_SHARED is specified, currently).
1319 +Of course, in case of the deleting branch has a busy file, it cannot be
1320 +deleted from the union.
1322 +In Unionfs, it took an approach which the memory pages mapped to
1323 +filedata are copied from the lower (real) file into the Unionfs's
1324 +virtual one and handles it by address_space operations. Recently Unionfs
1325 +changed it to this approach which aufs adopted since Jul 2006.
1326 diff --git a/Documentation/filesystems/aufs/design/08export.txt b/Documentation/filesystems/aufs/design/08export.txt
1327 new file mode 100644
1328 index 0000000..8394348
1330 +++ b/Documentation/filesystems/aufs/design/08export.txt
1333 +# Copyright (C) 2005-2009 Junjiro R. Okajima
1335 +# This program is free software; you can redistribute it and/or modify
1336 +# it under the terms of the GNU General Public License as published by
1337 +# the Free Software Foundation; either version 2 of the License, or
1338 +# (at your option) any later version.
1340 +# This program is distributed in the hope that it will be useful,
1341 +# but WITHOUT ANY WARRANTY; without even the implied warranty of
1342 +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
1343 +# GNU General Public License for more details.
1345 +# You should have received a copy of the GNU General Public License
1346 +# along with this program; if not, write to the Free Software
1347 +# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
1349 +Export Aufs via NFS
1350 +----------------------------------------------------------------------
1351 +Here is an approach.
1352 +- like xino/xib, add a new file 'xigen' which stores aufs inode
1354 +- iget_locked(): initialize aufs inode generation for a new inode, and
1355 + store it in xigen file.
1356 +- destroy_inode(): increment aufs inode generation and store it in xigen
1357 + file. it is necessary even if it is not unlinked, because any data of
1358 + inode may be changed by UDBA.
1359 +- encode_fh(): for a root dir, simply return FILEID_ROOT. otherwise
1360 + build file handle by
1361 + + branch id (4 bytes)
1362 + + superblock generation (4 bytes)
1363 + + inode number (4 or 8 bytes)
1364 + + parent dir inode number (4 or 8 bytes)
1365 + + inode generation (4 bytes))
1366 + + return value of exportfs_encode_fh() for the parent on a branch (4
1368 + + file handle for a branch (by exportfs_encode_fh())
1370 + + find the index of a branch from its id in handle, and check it is
1371 + still exist in aufs.
1372 + + 1st level: get the inode number from handle and search it in cache.
1373 + + 2nd level: if not found, get the parent inode number from handle and
1374 + search it in cache. and then open the parent dir, find the matching
1375 + inode number by vfs_readdir() and get its name, and call
1376 + lookup_one_len() for the target dentry.
1377 + + 3rd level: if the parent dir is not cached, call
1378 + exportfs_decode_fh() for a branch and get the parent on a branch,
1379 + build a pathname of it, convert it a pathname in aufs, call
1380 + path_lookup(). now aufs gets a parent dir dentry, then handle it as
1382 + + to open the dir, aufs needs struct vfsmount. aufs keeps vfsmount
1383 + for every branch, but not itself. to get this, (currently) aufs
1384 + searches in current->nsproxy->mnt_ns list. it may not be a good
1385 + idea, but I didn't get other approach.
1386 + + test the generation of the gotten inode.
1387 +- every inode operation: they may get EBUSY due to UDBA. in this case,
1388 + convert it into ESTALE for NFSD.
1389 +- readdir(): call lockdep_on/off() because filldir in NFSD calls
1390 + lookup_one_len(), vfs_getattr(), encode_fh() and others.
1391 diff --git a/Documentation/filesystems/aufs/design/09shwh.txt b/Documentation/filesystems/aufs/design/09shwh.txt
1392 new file mode 100644
1393 index 0000000..ce0c633
1395 +++ b/Documentation/filesystems/aufs/design/09shwh.txt
1398 +# Copyright (C) 2005-2009 Junjiro R. Okajima
1400 +# This program is free software; you can redistribute it and/or modify
1401 +# it under the terms of the GNU General Public License as published by
1402 +# the Free Software Foundation; either version 2 of the License, or
1403 +# (at your option) any later version.
1405 +# This program is distributed in the hope that it will be useful,
1406 +# but WITHOUT ANY WARRANTY; without even the implied warranty of
1407 +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
1408 +# GNU General Public License for more details.
1410 +# You should have received a copy of the GNU General Public License
1411 +# along with this program; if not, write to the Free Software
1412 +# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
1414 +Show Whiteout Mode (shwh)
1415 +----------------------------------------------------------------------
1416 +Generally aufs hides the name of whiteouts. But in some cases, to show
1417 +them is very useful for users. For instance, creating a new middle layer
1418 +(branch) by merging existing layers.
1420 +(borrowing aufs1 HOW-TO from a user, Michael Towers)
1421 +When you have three branches,
1422 +- Bottom: 'system', squashfs (underlying base system), read-only
1423 +- Middle: 'mods', squashfs, read-only
1424 +- Top: 'overlay', ram (tmpfs), read-write
1426 +The top layer is loaded at boot time and saved at shutdown, to preserve
1427 +the changes made to the system during the session.
1428 +When larger changes have been made, or smaller changes have accumulated,
1429 +the size of the saved top layer data grows. At this point, it would be
1430 +nice to be able to merge the two overlay branches ('mods' and 'overlay')
1431 +and rewrite the 'mods' squashfs, clearing the top layer and thus
1432 +restoring save and load speed.
1434 +This merging is simplified by the use of another aufs mount, of just the
1435 +two overlay branches using the 'shwh' option.
1436 +# mount -t aufs -o ro,shwh,br:/livesys/overlay=ro+wh:/livesys/mods=rr+wh \
1437 + aufs /livesys/merge_union
1439 +A merged view of these two branches is then available at
1440 +/livesys/merge_union, and the new feature is that the whiteouts are
1442 +Note that in 'shwh' mode the aufs mount must be 'ro', which will disable
1443 +writing to all branches. Also the default mode for all branches is 'ro'.
1444 +It is now possible to save the combined contents of the two overlay
1445 +branches to a new squashfs, e.g.:
1446 +# mksquashfs /livesys/merge_union /path/to/newmods.squash
1448 +This new squashfs archive can be stored on the boot device and the
1449 +initramfs will use it to replace the old one at the next boot.
1450 diff --git a/Documentation/filesystems/aufs/design/99plan.txt b/Documentation/filesystems/aufs/design/99plan.txt
1451 new file mode 100644
1452 index 0000000..78d1f0e
1454 +++ b/Documentation/filesystems/aufs/design/99plan.txt
1457 +# Copyright (C) 2005-2009 Junjiro R. Okajima
1459 +# This program is free software; you can redistribute it and/or modify
1460 +# it under the terms of the GNU General Public License as published by
1461 +# the Free Software Foundation; either version 2 of the License, or
1462 +# (at your option) any later version.
1464 +# This program is distributed in the hope that it will be useful,
1465 +# but WITHOUT ANY WARRANTY; without even the implied warranty of
1466 +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
1467 +# GNU General Public License for more details.
1469 +# You should have received a copy of the GNU General Public License
1470 +# along with this program; if not, write to the Free Software
1471 +# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
1475 +Restoring some features which was implemented in aufs1.
1476 +They were dropped in aufs2 in order to make source files simpler and
1477 +easier to be reviewed.
1480 +Test Only the Highest One for the Directory Permission (dirperm1 option)
1481 +----------------------------------------------------------------------
1482 +Let's try case study.
1483 +- aufs has two branches, upper readwrite and lower readonly.
1485 +- "dirA" exists under /ro, but /rw. and its mode is 0700.
1486 +- user invoked "chmod a+rx /au/dirA"
1487 +- then "dirA" becomes world readable?
1489 +In this case, /ro/dirA is still 0700 since it exists in readonly branch,
1490 +or it may be a natively readonly filesystem. If aufs respects the lower
1491 +branch, it should not respond readdir request from other users. But user
1492 +allowed it by chmod. Should really aufs rejects showing the entries
1495 +To be honest, I don't have a best solution for this case. So I
1496 +implemented 'dirperm1' and 'nodirperm1' option in aufs1, and leave it to
1498 +When dirperm1 is specified, aufs checks only the highest one for the
1499 +directory permission, and shows the entries. Otherwise, as usual, checks
1500 +every dir existing on all branches and rejects the request.
1502 +As a side effect, dirperm1 option improves the performance of aufs
1503 +because the number of permission check is reduced.
1506 +Being Another Aufs's Readonly Branch (robr)
1507 +----------------------------------------------------------------------
1508 +Aufs1 allows aufs to be another aufs's readonly branch.
1509 +This feature was developed by a user's request. But it may not be used
1513 +Copy-up on Open (coo=)
1514 +----------------------------------------------------------------------
1515 +By default the internal copy-up is executed when it is really necessary.
1516 +It is not done when a file is opened for writing, but when write(2) is
1517 +done. Users who have many (over 100) branches want to know and analyse
1518 +when and what file is copied-up. To insert a new upper branch which
1519 +contains such files only may improve the performance of aufs.
1521 +Aufs1 implemented "coo=none | leaf | all" option.
1524 +Refresh the Opened File (refrof)
1525 +----------------------------------------------------------------------
1526 +This option is implemented in aufs1 but incomplete.
1528 +When user reads from a file, he expects to get its latest filedata
1529 +generally. If the file is removed and a new same named file is created,
1530 +the content he gets is unchanged, ie. the unlinked filedata.
1532 +Let's try case study again.
1533 +- aufs has two branches.
1535 +- "fileA" exists under /ro, but /rw.
1536 +- user opened "/au/fileA".
1537 +- he or someone else inserts a branch (/new) between /rw and /ro.
1538 + /au = /rw + /new + /ro
1539 +- the new branch has "fileA".
1540 +- user reads from the opened "fileA"
1541 +- which filedata should aufs return, from /ro or /new?
1543 +Some people says it has to be "from /ro" and it is a semantics of Unix.
1544 +The others say it should be "from /new" because the file is not removed
1545 +and it is equivalent to the case of someone else modifies the file.
1547 +Here again I don't have a best and final answer. I got an idea to
1548 +implement 'refrof' and 'norefrof' option. When 'refrof' (REFResh the
1549 +Opened File) is specified (by default), aufs returns the filedata from
1551 +Otherwise from /new.
1552 diff --git a/fs/Kconfig b/fs/Kconfig
1553 index bd989c0..8af22e4 100644
1556 @@ -1541,6 +1541,8 @@ config UFS_DEBUG
1557 Y here. This will result in _many_ additional debugging messages to be
1558 written to the system log.
1560 +source "fs/aufs/Kconfig"
1564 menuconfig NETWORK_FILESYSTEMS
1565 diff --git a/fs/Makefile b/fs/Makefile
1566 index 0871ab5..364e863 100644
1569 @@ -123,3 +123,4 @@ obj-$(CONFIG_HPPFS) += hppfs/
1570 obj-$(CONFIG_DEBUG_FS) += debugfs/
1571 obj-$(CONFIG_OCFS2_FS) += ocfs2/
1572 obj-$(CONFIG_GFS2_FS) += gfs2/
1573 +obj-$(CONFIG_AUFS_FS) += aufs/
1574 diff --git a/fs/aufs/Kconfig b/fs/aufs/Kconfig
1575 new file mode 100644
1576 index 0000000..12e4327
1578 +++ b/fs/aufs/Kconfig
1581 + bool "Aufs (Advanced multi layered unification filesystem) support"
1582 + depends on EXPERIMENTAL
1584 + Aufs is a stackable unification filesystem such as Unionfs,
1585 + which unifies several directories and provides a merged single
1587 + In the early days, aufs was entirely re-designed and
1588 + re-implemented Unionfs Version 1.x series. Introducing many
1589 + original ideas, approaches and improvements, it becomes totally
1590 + different from Unionfs while keeping the basic features.
1594 + prompt "Maximum number of branches"
1595 + default AUFS_BRANCH_MAX_127
1597 + Specifies the maximum number of branches (or member directories)
1598 + in a single aufs. The larger value consumes more system
1599 + resources and has a minor impact to performance.
1600 +config AUFS_BRANCH_MAX_127
1603 + Specifies the maximum number of branches (or member directories)
1604 + in a single aufs. The larger value consumes more system
1605 + resources and has a minor impact to performance.
1606 +config AUFS_BRANCH_MAX_511
1609 + Specifies the maximum number of branches (or member directories)
1610 + in a single aufs. The larger value consumes more system
1611 + resources and has a minor impact to performance.
1612 +config AUFS_BRANCH_MAX_1023
1615 + Specifies the maximum number of branches (or member directories)
1616 + in a single aufs. The larger value consumes more system
1617 + resources and has a minor impact to performance.
1618 +config AUFS_BRANCH_MAX_32767
1621 + Specifies the maximum number of branches (or member directories)
1622 + in a single aufs. The larger value consumes more system
1623 + resources and has a minor impact to performance.
1626 +config AUFS_HINOTIFY
1627 + bool "Use inotify to detect actions on a branch"
1628 + depends on INOTIFY
1630 + If you want to modify files on branches directly, eg. bypassing aufs,
1631 + and want aufs to detect the changes of them fully, then enable this
1632 + option and use 'udba=inotify' mount option.
1633 + It will have a negative impact to the performance.
1634 + See detail in aufs.5.
1637 + bool "NFS-exportable aufs"
1638 + depends on EXPORTFS = y
1640 + If you want to export your mounted aufs via NFS, then enable this
1641 + option. There are several requirements for this configuration.
1642 + See detail in aufs.5.
1644 +config AUFS_INO_T_64
1646 + depends on AUFS_EXPORT
1647 + depends on 64BIT && !(ALPHA || S390)
1650 + Automatic configuration for internal use.
1651 + /* typedef unsigned long/int __kernel_ino_t */
1652 + /* alpha and s390x are int */
1655 + bool "Readdir in userspace"
1657 + If you have millions of files under a single aufs directory, and
1658 + meet the out of memory, then enable this option and set
1659 + environment variables for your readdir(3).
1660 + See detail in aufs.5.
1662 +config AUFS_SP_IATTR
1663 + bool "Respect the attributes (mtime/ctime mainly) of special files"
1665 + When you write something to a special file, some attributes of it
1666 + (mtime/ctime mainly) may be updated. Generally such updates are
1667 + less important (actually some device drivers and NFS ignore
1668 + it). But some applications (such like test program) requires
1669 + such updates. If you need these updates, then enable this
1670 + configuration which introduces some overhead.
1671 + Currently this configuration handles FIFO only.
1674 + bool "Show whiteouts"
1676 + If you want to make the whiteouts in aufs visible, then enable
1677 + this option and specify 'shwh' mount option. Although it may
1678 + sounds like philosophy or something, but in technically it
1679 + simply shows the name of whiteout with keeping its behaviour.
1681 +config AUFS_BR_RAMFS
1682 + bool "Ramfs (initramfs/rootfs) as an aufs branch"
1684 + If you want to use ramfs as an aufs branch fs, then enable this
1685 + option. Generally tmpfs is recommended.
1686 + Aufs prohibited them to be a branch fs by default, because
1687 + initramfs becomes unusable after switch_root or something
1688 + generally. If you sets initramfs as an aufs branch and boot your
1689 + system by switch_root, you will meet a problem easily since the
1690 + files in initramfs may be inaccessible.
1691 + Unless you are going to use ramfs as an aufs branch fs without
1692 + switch_root or something, leave it N.
1694 +config AUFS_BDEV_LOOP
1696 + depends on BLK_DEV_LOOP
1699 + Automatic configuration for internal use.
1700 + Convert =[ym] into =y.
1705 + Enable this to compile aufs internal debug code.
1706 + It will have a negative impact to the performance.
1708 +config AUFS_MAGIC_SYSRQ
1710 + depends on AUFS_DEBUG && MAGIC_SYSRQ
1713 + Automatic configuration for internal use.
1714 + When aufs supports Magic SysRq, enabled automatically.
1716 diff --git a/fs/aufs/Makefile b/fs/aufs/Makefile
1717 new file mode 100644
1718 index 0000000..29411e9
1720 +++ b/fs/aufs/Makefile
1723 +include ${srctree}/${src}/magic.mk
1725 +obj-$(CONFIG_AUFS_FS) += aufs.o
1726 +aufs-y := module.o sbinfo.o super.o branch.o xino.o sysaufs.o opts.o \
1727 + wkq.o vfsub.o dcsub.o \
1728 + cpup.o whout.o plink.o wbr_policy.o \
1729 + dinfo.o dentry.o \
1730 + finfo.o file.o f_op.o \
1732 + iinfo.o inode.o i_op.o i_op_add.o i_op_del.o i_op_ren.o \
1736 +aufs-$(CONFIG_SYSFS) += sysfs.o
1737 +aufs-$(CONFIG_DEBUG_FS) += dbgaufs.o
1738 +aufs-$(CONFIG_AUFS_BDEV_LOOP) += loop.o
1739 +aufs-$(CONFIG_AUFS_HINOTIFY) += hinotify.o
1740 +aufs-$(CONFIG_AUFS_EXPORT) += export.o
1741 +aufs-$(CONFIG_AUFS_RDU) += rdu.o
1742 +aufs-$(CONFIG_AUFS_SP_IATTR) += f_op_sp.o
1743 +aufs-$(CONFIG_AUFS_DEBUG) += debug.o
1744 +aufs-$(CONFIG_AUFS_MAGIC_SYSRQ) += sysrq.o
1745 diff --git a/fs/aufs/aufs.h b/fs/aufs/aufs.h
1746 new file mode 100644
1747 index 0000000..49bada2
1749 +++ b/fs/aufs/aufs.h
1752 + * Copyright (C) 2005-2009 Junjiro R. Okajima
1754 + * This program, aufs is free software; you can redistribute it and/or modify
1755 + * it under the terms of the GNU General Public License as published by
1756 + * the Free Software Foundation; either version 2 of the License, or
1757 + * (at your option) any later version.
1759 + * This program is distributed in the hope that it will be useful,
1760 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
1761 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
1762 + * GNU General Public License for more details.
1764 + * You should have received a copy of the GNU General Public License
1765 + * along with this program; if not, write to the Free Software
1766 + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
1770 + * all header files
1778 +#define AuStub(type, name, body, ...) \
1779 + static inline type name(__VA_ARGS__) { body; }
1781 +#define AuStubVoid(name, ...) \
1782 + AuStub(void, name, , __VA_ARGS__)
1783 +#define AuStubInt0(name, ...) \
1784 + AuStub(int, name, return 0, __VA_ARGS__)
1788 +#include "branch.h"
1791 +#include "dbgaufs.h"
1792 +#include "dentry.h"
1795 +#include "fstype.h"
1798 +#include "module.h"
1803 +#include "sysaufs.h"
1808 +#endif /* __KERNEL__ */
1809 +#endif /* __AUFS_H__ */
1810 diff --git a/fs/aufs/branch.c b/fs/aufs/branch.c
1811 new file mode 100644
1812 index 0000000..2717e9e
1814 +++ b/fs/aufs/branch.c
1817 + * Copyright (C) 2005-2009 Junjiro R. Okajima
1819 + * This program, aufs is free software; you can redistribute it and/or modify
1820 + * it under the terms of the GNU General Public License as published by
1821 + * the Free Software Foundation; either version 2 of the License, or
1822 + * (at your option) any later version.
1824 + * This program is distributed in the hope that it will be useful,
1825 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
1826 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
1827 + * GNU General Public License for more details.
1829 + * You should have received a copy of the GNU General Public License
1830 + * along with this program; if not, write to the Free Software
1831 + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
1835 + * branch management
1838 +#include <linux/file.h>
1839 +#include <linux/statfs.h>
1843 + * free a single branch
1845 +static void au_br_do_free(struct au_branch *br)
1848 + struct au_wbr *wbr;
1850 + if (br->br_xino.xi_file)
1851 + fput(br->br_xino.xi_file);
1852 + mutex_destroy(&br->br_xino.xi_nondir_mtx);
1854 + AuDebugOn(atomic_read(&br->br_count));
1858 + for (i = 0; i < AuBrWh_Last; i++)
1859 + dput(wbr->wbr_wh[i]);
1860 + AuDebugOn(atomic_read(&wbr->wbr_wh_running));
1861 + AuRwDestroy(&wbr->wbr_wh_rwsem);
1864 + /* some filesystems acquire extra lock */
1866 + mntput(br->br_mnt);
1874 + * frees all branches
1876 +void au_br_free(struct au_sbinfo *sbinfo)
1878 + aufs_bindex_t bmax;
1879 + struct au_branch **br;
1881 + AuRwMustWriteLock(&sbinfo->si_rwsem);
1883 + bmax = sbinfo->si_bend + 1;
1884 + br = sbinfo->si_branch;
1886 + au_br_do_free(*br++);
1890 + * find the index of a branch which is specified by @br_id.
1892 +int au_br_index(struct super_block *sb, aufs_bindex_t br_id)
1894 + aufs_bindex_t bindex, bend;
1896 + bend = au_sbend(sb);
1897 + for (bindex = 0; bindex <= bend; bindex++)
1898 + if (au_sbr_id(sb, bindex) == br_id)
1903 +/* ---------------------------------------------------------------------- */
1909 +static int test_overlap(struct super_block *sb, struct dentry *h_d1,
1910 + struct dentry *h_d2)
1912 + if (unlikely(h_d1 == h_d2))
1914 + return !!au_test_subdir(h_d1, h_d2)
1915 + || !!au_test_subdir(h_d2, h_d1)
1916 + || au_test_loopback_overlap(sb, h_d1, h_d2)
1917 + || au_test_loopback_overlap(sb, h_d2, h_d1);
1921 + * returns a newly allocated branch. @new_nbranch is a number of branches
1922 + * after adding a branch.
1924 +static struct au_branch *au_br_alloc(struct super_block *sb, int new_nbranch,
1927 + struct au_branch *add_branch;
1928 + struct dentry *root;
1930 + root = sb->s_root;
1931 + add_branch = kmalloc(sizeof(*add_branch), GFP_NOFS);
1932 + if (unlikely(!add_branch))
1935 + add_branch->br_wbr = NULL;
1936 + if (au_br_writable(perm)) {
1937 + /* may be freed separately at changing the branch permission */
1938 + add_branch->br_wbr = kmalloc(sizeof(*add_branch->br_wbr),
1940 + if (unlikely(!add_branch->br_wbr))
1944 + if (unlikely(au_sbr_realloc(au_sbi(sb), new_nbranch)
1945 + || au_di_realloc(au_di(root), new_nbranch)
1946 + || au_ii_realloc(au_ii(root->d_inode), new_nbranch)))
1948 + return add_branch; /* success */
1951 + kfree(add_branch->br_wbr);
1953 + kfree(add_branch);
1955 + return ERR_PTR(-ENOMEM);
1959 + * test if the branch permission is legal or not.
1961 +static int test_br(struct inode *inode, int brperm, char *path)
1966 + if (unlikely(au_br_writable(brperm) && IS_RDONLY(inode))) {
1967 + AuErr("write permission for readonly mount or inode, %s\n",
1977 + * 0: success, the caller will add it
1978 + * plus: success, it is already unified, the caller should ignore it
1981 +static int test_add(struct super_block *sb, struct au_opt_add *add, int remount)
1984 + aufs_bindex_t bend, bindex;
1985 + struct dentry *root;
1986 + struct inode *inode, *h_inode;
1988 + root = sb->s_root;
1989 + bend = au_sbend(sb);
1990 + if (unlikely(bend >= 0
1991 + && au_find_dbindex(root, add->path.dentry) >= 0)) {
1995 + AuErr("%s duplicated\n", add->pathname);
2000 + err = -ENOSPC; /* -E2BIG; */
2001 + if (unlikely(AUFS_BRANCH_MAX <= add->bindex
2002 + || AUFS_BRANCH_MAX - 1 <= bend)) {
2003 + AuErr("number of branches exceeded %s\n", add->pathname);
2008 + if (unlikely(add->bindex < 0 || bend + 1 < add->bindex)) {
2009 + AuErr("bad index %d\n", add->bindex);
2013 + inode = add->path.dentry->d_inode;
2015 + if (unlikely(!inode->i_nlink)) {
2016 + AuErr("no existence %s\n", add->pathname);
2021 + if (unlikely(inode->i_sb == sb)) {
2022 + AuErr("%s must be outside\n", add->pathname);
2026 + if (unlikely(au_test_fs_unsuppoted(inode->i_sb))) {
2027 + AuErr("unsupported filesystem, %s (%s)\n",
2028 + add->pathname, au_sbtype(inode->i_sb));
2032 + err = test_br(add->path.dentry->d_inode, add->perm, add->pathname);
2033 + if (unlikely(err))
2037 + return 0; /* success */
2040 + for (bindex = 0; bindex <= bend; bindex++)
2041 + if (unlikely(test_overlap(sb, add->path.dentry,
2042 + au_h_dptr(root, bindex)))) {
2043 + AuErr("%s is overlapped\n", add->pathname);
2048 + if (au_opt_test(au_mntflags(sb), WARN_PERM)) {
2049 + h_inode = au_h_dptr(root, 0)->d_inode;
2050 + if ((h_inode->i_mode & S_IALLUGO) != (inode->i_mode & S_IALLUGO)
2051 + || h_inode->i_uid != inode->i_uid
2052 + || h_inode->i_gid != inode->i_gid)
2053 + AuWarn("uid/gid/perm %s %u/%u/0%o, %u/%u/0%o\n",
2055 + inode->i_uid, inode->i_gid,
2056 + (inode->i_mode & S_IALLUGO),
2057 + h_inode->i_uid, h_inode->i_gid,
2058 + (h_inode->i_mode & S_IALLUGO));
2066 + * initialize or clean the whiteouts for an adding branch
2068 +static int au_br_init_wh(struct super_block *sb, struct au_branch *br,
2069 + int new_perm, struct dentry *h_root)
2071 + int err, old_perm;
2072 + aufs_bindex_t bindex;
2073 + struct mutex *h_mtx;
2074 + struct au_wbr *wbr;
2075 + struct au_hinode *hdir;
2078 + old_perm = br->br_perm;
2079 + br->br_perm = new_perm;
2082 + bindex = au_br_index(sb, br->br_id);
2083 + if (0 <= bindex) {
2084 + hdir = au_hi(sb->s_root->d_inode, bindex);
2085 + au_hin_imtx_lock_nested(hdir, AuLsc_I_PARENT);
2087 + h_mtx = &h_root->d_inode->i_mutex;
2088 + mutex_lock_nested(h_mtx, AuLsc_I_PARENT);
2091 + err = au_wh_init(h_root, br, sb);
2093 + wbr_wh_write_lock(wbr);
2094 + err = au_wh_init(h_root, br, sb);
2095 + wbr_wh_write_unlock(wbr);
2098 + au_hin_imtx_unlock(hdir);
2100 + mutex_unlock(h_mtx);
2101 + br->br_perm = old_perm;
2103 + if (!err && wbr && !au_br_writable(new_perm)) {
2105 + br->br_wbr = NULL;
2111 +static int au_wbr_init(struct au_branch *br, struct super_block *sb,
2112 + int perm, struct path *path)
2115 + struct kstatfs kst;
2116 + struct au_wbr *wbr;
2117 + struct dentry *h_dentry;
2120 + au_rw_init(&wbr->wbr_wh_rwsem);
2121 + memset(wbr->wbr_wh, 0, sizeof(wbr->wbr_wh));
2122 + atomic_set(&wbr->wbr_wh_running, 0);
2123 + wbr->wbr_bytes = 0;
2126 + * a limit for rmdir/rename a dir
2127 + * cf. AUFS_MAX_NAMELEN in include/linux/aufs_type.h
2129 + h_dentry = path->dentry;
2130 + err = vfs_statfs(h_dentry, &kst);
2131 + if (unlikely(err))
2134 + if (kst.f_namelen >= NAME_MAX)
2135 + err = au_br_init_wh(sb, br, perm, h_dentry);
2137 + AuErr("%.*s(%s), unsupported namelen %ld\n",
2138 + AuDLNPair(h_dentry), au_sbtype(h_dentry->d_sb),
2145 +/* intialize a new branch */
2146 +static int au_br_init(struct au_branch *br, struct super_block *sb,
2147 + struct au_opt_add *add)
2152 + memset(&br->br_xino, 0, sizeof(br->br_xino));
2153 + mutex_init(&br->br_xino.xi_nondir_mtx);
2154 + br->br_perm = add->perm;
2155 + br->br_mnt = add->path.mnt; /* set first, mntget() later */
2156 + atomic_set(&br->br_count, 0);
2157 + br->br_xino_upper = AUFS_XINO_TRUNC_INIT;
2158 + atomic_set(&br->br_xino_running, 0);
2159 + br->br_id = au_new_br_id(sb);
2161 + if (au_br_writable(add->perm)) {
2162 + err = au_wbr_init(br, sb, add->perm, &add->path);
2163 + if (unlikely(err))
2167 + if (au_opt_test(au_mntflags(sb), XINO)) {
2168 + err = au_xino_br(sb, br, add->path.dentry->d_inode->i_ino,
2169 + au_sbr(sb, 0)->br_xino.xi_file, /*do_test*/1);
2170 + if (unlikely(err)) {
2171 + AuDebugOn(br->br_xino.xi_file);
2176 + sysaufs_br_init(br);
2177 + mntget(add->path.mnt);
2183 +static void au_br_do_add_brp(struct au_sbinfo *sbinfo, aufs_bindex_t bindex,
2184 + struct au_branch *br, aufs_bindex_t bend,
2185 + aufs_bindex_t amount)
2187 + struct au_branch **brp;
2189 + AuRwMustWriteLock(&sbinfo->si_rwsem);
2191 + brp = sbinfo->si_branch + bindex;
2192 + memmove(brp + 1, brp, sizeof(*brp) * amount);
2194 + sbinfo->si_bend++;
2195 + if (unlikely(bend < 0))
2196 + sbinfo->si_bend = 0;
2199 +static void au_br_do_add_hdp(struct au_dinfo *dinfo, aufs_bindex_t bindex,
2200 + aufs_bindex_t bend, aufs_bindex_t amount)
2202 + struct au_hdentry *hdp;
2204 + AuRwMustWriteLock(&dinfo->di_rwsem);
2206 + hdp = dinfo->di_hdentry + bindex;
2207 + memmove(hdp + 1, hdp, sizeof(*hdp) * amount);
2208 + au_h_dentry_init(hdp);
2210 + if (unlikely(bend < 0))
2211 + dinfo->di_bstart = 0;
2214 +static void au_br_do_add_hip(struct au_iinfo *iinfo, aufs_bindex_t bindex,
2215 + aufs_bindex_t bend, aufs_bindex_t amount)
2217 + struct au_hinode *hip;
2219 + AuRwMustWriteLock(&iinfo->ii_rwsem);
2221 + hip = iinfo->ii_hinode + bindex;
2222 + memmove(hip + 1, hip, sizeof(*hip) * amount);
2223 + hip->hi_inode = NULL;
2224 + au_hin_init(hip, NULL);
2226 + if (unlikely(bend < 0))
2227 + iinfo->ii_bstart = 0;
2230 +static void au_br_do_add(struct super_block *sb, struct dentry *h_dentry,
2231 + struct au_branch *br, aufs_bindex_t bindex)
2233 + struct dentry *root;
2234 + struct inode *root_inode;
2235 + aufs_bindex_t bend, amount;
2237 + root = sb->s_root;
2238 + root_inode = root->d_inode;
2239 + au_plink_maint_block(sb);
2240 + bend = au_sbend(sb);
2241 + amount = bend + 1 - bindex;
2242 + au_br_do_add_brp(au_sbi(sb), bindex, br, bend, amount);
2243 + au_br_do_add_hdp(au_di(root), bindex, bend, amount);
2244 + au_br_do_add_hip(au_ii(root_inode), bindex, bend, amount);
2245 + au_set_h_dptr(root, bindex, dget(h_dentry));
2246 + au_set_h_iptr(root_inode, bindex, au_igrab(h_dentry->d_inode),
2250 +int au_br_add(struct super_block *sb, struct au_opt_add *add, int remount)
2253 + aufs_bindex_t bend, add_bindex;
2254 + struct dentry *root, *h_dentry;
2255 + struct inode *root_inode;
2256 + struct au_branch *add_branch;
2258 + root = sb->s_root;
2259 + root_inode = root->d_inode;
2260 + IMustLock(root_inode);
2261 + err = test_add(sb, add, remount);
2262 + if (unlikely(err < 0))
2266 + goto out; /* success */
2269 + bend = au_sbend(sb);
2270 + add_branch = au_br_alloc(sb, bend + 2, add->perm);
2271 + err = PTR_ERR(add_branch);
2272 + if (IS_ERR(add_branch))
2275 + err = au_br_init(add_branch, sb, add);
2276 + if (unlikely(err)) {
2277 + au_br_do_free(add_branch);
2281 + add_bindex = add->bindex;
2282 + h_dentry = add->path.dentry;
2284 + au_br_do_add(sb, h_dentry, add_branch, add_bindex);
2286 + sysaufs_brs_del(sb, add_bindex);
2287 + au_br_do_add(sb, h_dentry, add_branch, add_bindex);
2288 + sysaufs_brs_add(sb, add_bindex);
2291 + if (!add_bindex) {
2292 + au_cpup_attr_all(root_inode, /*force*/1);
2293 + sb->s_maxbytes = h_dentry->d_sb->s_maxbytes;
2295 + au_add_nlink(root_inode, h_dentry->d_inode);
2298 + * this test/set prevents aufs from handling unnecesary inotify events
2299 + * of xino files, in a case of re-adding a writable branch which was
2300 + * once detached from aufs.
2302 + if (au_xino_brid(sb) < 0
2303 + && au_br_writable(add_branch->br_perm)
2304 + && !au_test_fs_bad_xino(h_dentry->d_sb)
2305 + && add_branch->br_xino.xi_file
2306 + && add_branch->br_xino.xi_file->f_dentry->d_parent == h_dentry)
2307 + au_xino_brid_set(sb, add_branch->br_id);
2313 +/* ---------------------------------------------------------------------- */
2319 +/* to show the line number, do not make it inlined function */
2320 +#define AuVerbose(do_info, fmt, ...) do { \
2322 + AuInfo(fmt, ##__VA_ARGS__); \
2326 + * test if the branch is deletable or not.
2328 +static int test_dentry_busy(struct dentry *root, aufs_bindex_t bindex,
2329 + unsigned int sigen)
2331 + int err, i, j, ndentry;
2332 + aufs_bindex_t bstart, bend;
2333 + unsigned char verbose;
2334 + struct au_dcsub_pages dpages;
2335 + struct au_dpage *dpage;
2337 + struct inode *inode;
2339 + err = au_dpages_init(&dpages, GFP_NOFS);
2340 + if (unlikely(err))
2342 + err = au_dcsub_pages(&dpages, root, NULL, NULL);
2343 + if (unlikely(err))
2346 + verbose = !!au_opt_test(au_mntflags(root->d_sb), VERBOSE);
2347 + for (i = 0; !err && i < dpages.ndpage; i++) {
2348 + dpage = dpages.dpages + i;
2349 + ndentry = dpage->ndentry;
2350 + for (j = 0; !err && j < ndentry; j++) {
2351 + d = dpage->dentries[j];
2352 + AuDebugOn(!atomic_read(&d->d_count));
2353 + inode = d->d_inode;
2354 + if (au_digen(d) == sigen && au_iigen(inode) == sigen)
2355 + di_read_lock_child(d, AuLock_IR);
2357 + di_write_lock_child(d);
2358 + err = au_reval_dpath(d, sigen);
2360 + di_downgrade_lock(d, AuLock_IR);
2362 + di_write_unlock(d);
2367 + bstart = au_dbstart(d);
2368 + bend = au_dbend(d);
2369 + if (bstart <= bindex
2371 + && au_h_dptr(d, bindex)
2372 + && (!S_ISDIR(inode->i_mode) || bstart == bend)) {
2374 + AuVerbose(verbose, "busy %.*s\n", AuDLNPair(d));
2376 + di_read_unlock(d, AuLock_IR);
2381 + au_dpages_free(&dpages);
2386 +static int test_inode_busy(struct super_block *sb, aufs_bindex_t bindex,
2387 + unsigned int sigen)
2391 + aufs_bindex_t bstart, bend;
2392 + unsigned char verbose;
2395 + verbose = !!au_opt_test(au_mntflags(sb), VERBOSE);
2396 + list_for_each_entry(i, &sb->s_inodes, i_sb_list) {
2397 + AuDebugOn(!atomic_read(&i->i_count));
2398 + if (!list_empty(&i->i_dentry))
2401 + if (au_iigen(i) == sigen)
2402 + ii_read_lock_child(i);
2404 + ii_write_lock_child(i);
2405 + err = au_refresh_hinode_self(i, /*do_attr*/1);
2407 + ii_downgrade_lock(i);
2409 + ii_write_unlock(i);
2414 + bstart = au_ibstart(i);
2415 + bend = au_ibend(i);
2416 + if (bstart <= bindex
2418 + && au_h_iptr(i, bindex)
2419 + && (!S_ISDIR(i->i_mode) || bstart == bend)) {
2421 + AuVerbose(verbose, "busy i%lu\n", i->i_ino);
2422 + ii_read_unlock(i);
2425 + ii_read_unlock(i);
2431 +static int test_children_busy(struct dentry *root, aufs_bindex_t bindex)
2434 + unsigned int sigen;
2436 + sigen = au_sigen(root->d_sb);
2437 + DiMustNoWaiters(root);
2438 + IiMustNoWaiters(root->d_inode);
2439 + di_write_unlock(root);
2440 + err = test_dentry_busy(root, bindex, sigen);
2442 + err = test_inode_busy(root->d_sb, bindex, sigen);
2443 + di_write_lock_child(root); /* aufs_write_lock() calls ..._child() */
2448 +static void au_br_do_del_brp(struct au_sbinfo *sbinfo,
2449 + const aufs_bindex_t bindex,
2450 + const aufs_bindex_t bend)
2452 + struct au_branch **brp, **p;
2454 + AuRwMustWriteLock(&sbinfo->si_rwsem);
2456 + brp = sbinfo->si_branch + bindex;
2457 + if (bindex < bend)
2458 + memmove(brp, brp + 1, sizeof(*brp) * (bend - bindex));
2459 + sbinfo->si_branch[0 + bend] = NULL;
2460 + sbinfo->si_bend--;
2462 + p = krealloc(sbinfo->si_branch, sizeof(*p) * bend, GFP_NOFS);
2464 + sbinfo->si_branch = p;
2467 +static void au_br_do_del_hdp(struct au_dinfo *dinfo, const aufs_bindex_t bindex,
2468 + const aufs_bindex_t bend)
2470 + struct au_hdentry *hdp, *p;
2472 + AuRwMustWriteLock(&dinfo->di_rwsem);
2474 + hdp = dinfo->di_hdentry + bindex;
2475 + if (bindex < bend)
2476 + memmove(hdp, hdp + 1, sizeof(*hdp) * (bend - bindex));
2477 + dinfo->di_hdentry[0 + bend].hd_dentry = NULL;
2480 + p = krealloc(dinfo->di_hdentry, sizeof(*p) * bend, GFP_NOFS);
2482 + dinfo->di_hdentry = p;
2485 +static void au_br_do_del_hip(struct au_iinfo *iinfo, const aufs_bindex_t bindex,
2486 + const aufs_bindex_t bend)
2488 + struct au_hinode *hip, *p;
2490 + AuRwMustWriteLock(&iinfo->ii_rwsem);
2492 + hip = iinfo->ii_hinode + bindex;
2493 + if (bindex < bend)
2494 + memmove(hip, hip + 1, sizeof(*hip) * (bend - bindex));
2495 + iinfo->ii_hinode[0 + bend].hi_inode = NULL;
2496 + au_hin_init(iinfo->ii_hinode + bend, NULL);
2499 + p = krealloc(iinfo->ii_hinode, sizeof(*p) * bend, GFP_NOFS);
2501 + iinfo->ii_hinode = p;
2504 +static void au_br_do_del(struct super_block *sb, aufs_bindex_t bindex,
2505 + struct au_branch *br)
2507 + aufs_bindex_t bend;
2508 + struct au_sbinfo *sbinfo;
2509 + struct dentry *root;
2510 + struct inode *inode;
2512 + SiMustWriteLock(sb);
2514 + root = sb->s_root;
2515 + inode = root->d_inode;
2516 + au_plink_maint_block(sb);
2517 + sbinfo = au_sbi(sb);
2518 + bend = sbinfo->si_bend;
2520 + dput(au_h_dptr(root, bindex));
2521 + au_hiput(au_hi(inode, bindex));
2522 + au_br_do_free(br);
2524 + au_br_do_del_brp(sbinfo, bindex, bend);
2525 + au_br_do_del_hdp(au_di(root), bindex, bend);
2526 + au_br_do_del_hip(au_ii(inode), bindex, bend);
2529 +int au_br_del(struct super_block *sb, struct au_opt_del *del, int remount)
2532 + unsigned int mnt_flags;
2533 + aufs_bindex_t bindex, bend, br_id;
2534 + unsigned char do_wh, verbose;
2535 + struct au_branch *br;
2536 + struct au_wbr *wbr;
2539 + bindex = au_find_dbindex(sb->s_root, del->h_path.dentry);
2542 + goto out; /* success */
2544 + AuErr("%s no such branch\n", del->pathname);
2547 + AuDbg("bindex b%d\n", bindex);
2550 + mnt_flags = au_mntflags(sb);
2551 + verbose = !!au_opt_test(mnt_flags, VERBOSE);
2552 + bend = au_sbend(sb);
2553 + if (unlikely(!bend)) {
2554 + AuVerbose(verbose, "no more branches left\n");
2557 + br = au_sbr(sb, bindex);
2558 + i = atomic_read(&br->br_count);
2559 + if (unlikely(i)) {
2560 + AuVerbose(verbose, "%d file(s) opened\n", i);
2565 + do_wh = wbr && (wbr->wbr_whbase || wbr->wbr_plink || wbr->wbr_orph);
2567 + /* instead of WbrWhMustWriteLock(wbr) */
2568 + SiMustWriteLock(sb);
2569 + for (i = 0; i < AuBrWh_Last; i++) {
2570 + dput(wbr->wbr_wh[i]);
2571 + wbr->wbr_wh[i] = NULL;
2575 + err = test_children_busy(sb->s_root, bindex);
2576 + if (unlikely(err)) {
2583 + br_id = br->br_id;
2585 + au_br_do_del(sb, bindex, br);
2587 + sysaufs_brs_del(sb, bindex);
2588 + au_br_do_del(sb, bindex, br);
2589 + sysaufs_brs_add(sb, bindex);
2593 + au_cpup_attr_all(sb->s_root->d_inode, /*force*/1);
2594 + sb->s_maxbytes = au_sbr_sb(sb, 0)->s_maxbytes;
2596 + au_sub_nlink(sb->s_root->d_inode, del->h_path.dentry->d_inode);
2597 + if (au_opt_test(mnt_flags, PLINK))
2598 + au_plink_half_refresh(sb, br_id);
2600 + if (au_xino_brid(sb) == br->br_id)
2601 + au_xino_brid_set(sb, -1);
2602 + goto out; /* success */
2606 + rerr = au_br_init_wh(sb, br, br->br_perm, del->h_path.dentry);
2608 + AuWarn("failed re-creating base whiteout, %s. (%d)\n",
2609 + del->pathname, rerr);
2614 +/* ---------------------------------------------------------------------- */
2617 + * change a branch permission
2620 +static int do_need_sigen_inc(int a, int b)
2622 + return au_br_whable(a) && !au_br_whable(b);
2625 +static int need_sigen_inc(int old, int new)
2627 + return do_need_sigen_inc(old, new)
2628 + || do_need_sigen_inc(new, old);
2631 +static int au_br_mod_files_ro(struct super_block *sb, aufs_bindex_t bindex)
2634 + unsigned long n, ul, bytes, files;
2635 + aufs_bindex_t bstart;
2636 + struct file *file, *hf, **a;
2637 + const int step_bytes = 1024, /* memory allocation unit */
2638 + step_files = step_bytes / sizeof(*a);
2642 + bytes = step_bytes;
2643 + files = step_files;
2644 + a = kmalloc(bytes, GFP_NOFS);
2648 + /* no need file_list_lock() since sbinfo is locked? defered? */
2649 + list_for_each_entry(file, &sb->s_files, f_u.fu_list) {
2650 + if (special_file(file->f_dentry->d_inode->i_mode))
2653 + AuDbg("%.*s\n", AuDLNPair(file->f_dentry));
2654 + fi_read_lock(file);
2655 + if (unlikely(au_test_mmapped(file))) {
2657 + FiMustNoWaiters(file);
2658 + fi_read_unlock(file);
2662 + bstart = au_fbstart(file);
2663 + if (!S_ISREG(file->f_dentry->d_inode->i_mode)
2664 + || !(file->f_mode & FMODE_WRITE)
2665 + || bstart != bindex) {
2666 + FiMustNoWaiters(file);
2667 + fi_read_unlock(file);
2671 + hf = au_h_fptr(file, bstart);
2672 + FiMustNoWaiters(file);
2673 + fi_read_unlock(file);
2681 + bytes += step_bytes;
2682 + files += step_files;
2683 + p = krealloc(a, bytes, GFP_NOFS);
2693 + for (ul = 0; ul < n; ul++) {
2694 + /* todo: already flushed? */
2695 + /* cf. fs/super.c:mark_files_ro() */
2697 + hf->f_mode &= ~FMODE_WRITE;
2698 + if (!file_check_writeable(hf)) {
2699 + file_release_write(hf);
2700 + mnt_drop_write(hf->f_vfsmnt);
2710 +int au_br_mod(struct super_block *sb, struct au_opt_mod *mod, int remount,
2714 + aufs_bindex_t bindex;
2716 + struct dentry *root;
2717 + struct au_branch *br;
2719 + root = sb->s_root;
2720 + au_plink_maint_block(sb);
2721 + bindex = au_find_dbindex(root, mod->h_root);
2724 + return 0; /* success */
2726 + AuErr("%s no such branch\n", mod->path);
2729 + AuDbg("bindex b%d\n", bindex);
2731 + err = test_br(mod->h_root->d_inode, mod->perm, mod->path);
2732 + if (unlikely(err))
2735 + br = au_sbr(sb, bindex);
2736 + if (br->br_perm == mod->perm)
2737 + return 0; /* success */
2739 + if (au_br_writable(br->br_perm)) {
2740 + /* remove whiteout base */
2741 + err = au_br_init_wh(sb, br, mod->perm, mod->h_root);
2742 + if (unlikely(err))
2745 + if (!au_br_writable(mod->perm)) {
2746 + /* rw --> ro, file might be mmapped */
2747 + DiMustNoWaiters(root);
2748 + IiMustNoWaiters(root->d_inode);
2749 + di_write_unlock(root);
2750 + err = au_br_mod_files_ro(sb, bindex);
2751 + /* aufs_write_lock() calls ..._child() */
2752 + di_write_lock_child(root);
2754 + if (unlikely(err)) {
2756 + br->br_wbr = kmalloc(sizeof(*br->br_wbr),
2759 + path.mnt = br->br_mnt;
2760 + path.dentry = mod->h_root;
2761 + rerr = au_wbr_init(br, sb, br->br_perm,
2764 + if (unlikely(rerr)) {
2765 + AuIOErr("nested error %d (%d)\n",
2767 + br->br_perm = mod->perm;
2771 + } else if (au_br_writable(mod->perm)) {
2774 + br->br_wbr = kmalloc(sizeof(*br->br_wbr), GFP_NOFS);
2776 + path.mnt = br->br_mnt;
2777 + path.dentry = mod->h_root;
2778 + err = au_wbr_init(br, sb, mod->perm, &path);
2779 + if (unlikely(err)) {
2780 + kfree(br->br_wbr);
2781 + br->br_wbr = NULL;
2787 + *do_update |= need_sigen_inc(br->br_perm, mod->perm);
2788 + br->br_perm = mod->perm;
2794 diff --git a/fs/aufs/branch.h b/fs/aufs/branch.h
2795 new file mode 100644
2796 index 0000000..1a7219c
2798 +++ b/fs/aufs/branch.h
2801 + * Copyright (C) 2005-2009 Junjiro R. Okajima
2803 + * This program, aufs is free software; you can redistribute it and/or modify
2804 + * it under the terms of the GNU General Public License as published by
2805 + * the Free Software Foundation; either version 2 of the License, or
2806 + * (at your option) any later version.
2808 + * This program is distributed in the hope that it will be useful,
2809 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
2810 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
2811 + * GNU General Public License for more details.
2813 + * You should have received a copy of the GNU General Public License
2814 + * along with this program; if not, write to the Free Software
2815 + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
2819 + * branch filesystems and xino for them
2822 +#ifndef __AUFS_BRANCH_H__
2823 +#define __AUFS_BRANCH_H__
2827 +#include <linux/fs.h>
2828 +#include <linux/mount.h>
2829 +#include <linux/aufs_type.h>
2833 +/* ---------------------------------------------------------------------- */
2836 +struct au_xino_file {
2837 + struct file *xi_file;
2838 + struct mutex xi_nondir_mtx;
2840 + /* todo: make xino files an array to support huge inode number */
2842 +#ifdef CONFIG_DEBUG_FS
2843 + struct dentry *xi_dbgaufs;
2847 +/* members for writable branch only */
2848 +enum {AuBrWh_BASE, AuBrWh_PLINK, AuBrWh_ORPH, AuBrWh_Last};
2850 + struct au_rwsem wbr_wh_rwsem;
2851 + struct dentry *wbr_wh[AuBrWh_Last];
2852 + atomic_t wbr_wh_running;
2853 +#define wbr_whbase wbr_wh[AuBrWh_BASE] /* whiteout base */
2854 +#define wbr_plink wbr_wh[AuBrWh_PLINK] /* pseudo-link dir */
2855 +#define wbr_orph wbr_wh[AuBrWh_ORPH] /* dir for orphans */
2858 + unsigned long long wbr_bytes;
2861 +/* protected by superblock rwsem */
2863 + struct au_xino_file br_xino;
2865 + aufs_bindex_t br_id;
2868 + struct vfsmount *br_mnt;
2869 + atomic_t br_count;
2871 + struct au_wbr *br_wbr;
2873 + /* xino truncation */
2874 + blkcnt_t br_xino_upper; /* watermark in blocks */
2875 + atomic_t br_xino_running;
2877 +#ifdef CONFIG_SYSFS
2878 + /* an entry under sysfs per mount-point */
2880 + struct attribute br_attr;
2884 +/* ---------------------------------------------------------------------- */
2886 +/* branch permission and attribute */
2888 + AuBrPerm_RW, /* writable, linkable wh */
2889 + AuBrPerm_RO, /* readonly, no wh */
2890 + AuBrPerm_RR, /* natively readonly, no wh */
2892 + AuBrPerm_RWNoLinkWH, /* un-linkable whiteouts */
2894 + AuBrPerm_ROWH, /* whiteout-able */
2895 + AuBrPerm_RRWH, /* whiteout-able */
2900 +static inline int au_br_writable(int brperm)
2902 + return brperm == AuBrPerm_RW || brperm == AuBrPerm_RWNoLinkWH;
2905 +static inline int au_br_whable(int brperm)
2907 + return brperm == AuBrPerm_RW
2908 + || brperm == AuBrPerm_ROWH
2909 + || brperm == AuBrPerm_RRWH;
2912 +static inline int au_br_rdonly(struct au_branch *br)
2914 + return ((br->br_mnt->mnt_sb->s_flags & MS_RDONLY)
2915 + || !au_br_writable(br->br_perm))
2919 +static inline int au_br_hinotifyable(int brperm __maybe_unused)
2921 +#ifdef CONFIG_AUFS_HINOTIFY
2922 + return brperm != AuBrPerm_RR && brperm != AuBrPerm_RRWH;
2928 +/* ---------------------------------------------------------------------- */
2932 +void au_br_free(struct au_sbinfo *sinfo);
2933 +int au_br_index(struct super_block *sb, aufs_bindex_t br_id);
2935 +int au_br_add(struct super_block *sb, struct au_opt_add *add, int remount);
2937 +int au_br_del(struct super_block *sb, struct au_opt_del *del, int remount);
2939 +int au_br_mod(struct super_block *sb, struct au_opt_mod *mod, int remount,
2943 +static const loff_t au_loff_max = LLONG_MAX;
2945 +int au_xib_trunc(struct super_block *sb);
2946 +ssize_t xino_fread(au_readf_t func, struct file *file, void *buf, size_t size,
2948 +ssize_t xino_fwrite(au_writef_t func, struct file *file, void *buf, size_t size,
2950 +struct file *au_xino_create2(struct file *base_file, struct file *copy_src);
2951 +struct file *au_xino_create(struct super_block *sb, char *fname, int silent);
2952 +ino_t au_xino_new_ino(struct super_block *sb);
2953 +int au_xino_write0(struct super_block *sb, aufs_bindex_t bindex, ino_t h_ino,
2955 +int au_xino_write(struct super_block *sb, aufs_bindex_t bindex, ino_t h_ino,
2957 +int au_xino_read(struct super_block *sb, aufs_bindex_t bindex, ino_t h_ino,
2959 +int au_xino_br(struct super_block *sb, struct au_branch *br, ino_t hino,
2960 + struct file *base_file, int do_test);
2961 +int au_xino_trunc(struct super_block *sb, aufs_bindex_t bindex);
2963 +struct au_opt_xino;
2964 +int au_xino_set(struct super_block *sb, struct au_opt_xino *xino, int remount);
2965 +void au_xino_clr(struct super_block *sb);
2966 +struct file *au_xino_def(struct super_block *sb);
2967 +int au_xino_path(struct seq_file *seq, struct file *file);
2969 +/* ---------------------------------------------------------------------- */
2971 +/* Superblock to branch */
2973 +aufs_bindex_t au_sbr_id(struct super_block *sb, aufs_bindex_t bindex)
2975 + return au_sbr(sb, bindex)->br_id;
2979 +struct vfsmount *au_sbr_mnt(struct super_block *sb, aufs_bindex_t bindex)
2981 + return au_sbr(sb, bindex)->br_mnt;
2985 +struct super_block *au_sbr_sb(struct super_block *sb, aufs_bindex_t bindex)
2987 + return au_sbr_mnt(sb, bindex)->mnt_sb;
2990 +static inline void au_sbr_put(struct super_block *sb, aufs_bindex_t bindex)
2992 + atomic_dec_return(&au_sbr(sb, bindex)->br_count);
2995 +static inline int au_sbr_perm(struct super_block *sb, aufs_bindex_t bindex)
2997 + return au_sbr(sb, bindex)->br_perm;
3000 +static inline int au_sbr_whable(struct super_block *sb, aufs_bindex_t bindex)
3002 + return au_br_whable(au_sbr_perm(sb, bindex));
3005 +/* ---------------------------------------------------------------------- */
3008 + * wbr_wh_read_lock, wbr_wh_write_lock
3009 + * wbr_wh_read_unlock, wbr_wh_write_unlock, wbr_wh_downgrade_lock
3011 +AuSimpleRwsemFuncs(wbr_wh, struct au_wbr *wbr, &wbr->wbr_wh_rwsem);
3013 +#define WbrWhMustNoWaiters(wbr) AuRwMustNoWaiters(&wbr->wbr_wh_rwsem)
3014 +#define WbrWhMustAnyLock(wbr) AuRwMustAnyLock(&wbr->wbr_wh_rwsem)
3015 +#define WbrWhMustWriteLock(wbr) AuRwMustWriteLock(&wbr->wbr_wh_rwsem)
3017 +#endif /* __KERNEL__ */
3018 +#endif /* __AUFS_BRANCH_H__ */
3019 diff --git a/fs/aufs/cpup.c b/fs/aufs/cpup.c
3020 new file mode 100644
3021 index 0000000..7f70e2f
3023 +++ b/fs/aufs/cpup.c
3026 + * Copyright (C) 2005-2009 Junjiro R. Okajima
3028 + * This program, aufs is free software; you can redistribute it and/or modify
3029 + * it under the terms of the GNU General Public License as published by
3030 + * the Free Software Foundation; either version 2 of the License, or
3031 + * (at your option) any later version.
3033 + * This program is distributed in the hope that it will be useful,
3034 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
3035 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
3036 + * GNU General Public License for more details.
3038 + * You should have received a copy of the GNU General Public License
3039 + * along with this program; if not, write to the Free Software
3040 + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
3044 + * copy-up functions, see wbr_policy.c for copy-down
3047 +#include <linux/file.h>
3048 +#include <linux/fs_stack.h>
3049 +#include <linux/mm.h>
3050 +#include <linux/uaccess.h>
3053 +void au_cpup_attr_flags(struct inode *dst, struct inode *src)
3055 + const unsigned int mask = S_DEAD | S_SWAPFILE | S_PRIVATE
3056 + | S_NOATIME | S_NOCMTIME;
3058 + dst->i_flags |= src->i_flags & ~mask;
3059 + if (au_test_fs_notime(dst->i_sb))
3060 + dst->i_flags |= S_NOATIME | S_NOCMTIME;
3063 +void au_cpup_attr_timesizes(struct inode *inode)
3065 + struct inode *h_inode;
3067 + h_inode = au_h_iptr(inode, au_ibstart(inode));
3068 + fsstack_copy_attr_times(inode, h_inode);
3069 + vfsub_copy_inode_size(inode, h_inode);
3072 +void au_cpup_attr_nlink(struct inode *inode, int force)
3074 + struct inode *h_inode;
3075 + struct super_block *sb;
3076 + aufs_bindex_t bindex, bend;
3079 + bindex = au_ibstart(inode);
3080 + h_inode = au_h_iptr(inode, bindex);
3082 + && !S_ISDIR(h_inode->i_mode)
3083 + && au_opt_test(au_mntflags(sb), PLINK)
3084 + && au_plink_test(inode))
3087 + inode->i_nlink = h_inode->i_nlink;
3090 + * fewer nlink makes find(1) noisy, but larger nlink doesn't.
3091 + * it may includes whplink directory.
3093 + if (S_ISDIR(h_inode->i_mode)) {
3094 + bend = au_ibend(inode);
3095 + for (bindex++; bindex <= bend; bindex++) {
3096 + h_inode = au_h_iptr(inode, bindex);
3098 + au_add_nlink(inode, h_inode);
3103 +void au_cpup_attr_changeable(struct inode *inode)
3105 + struct inode *h_inode;
3107 + h_inode = au_h_iptr(inode, au_ibstart(inode));
3108 + inode->i_mode = h_inode->i_mode;
3109 + inode->i_uid = h_inode->i_uid;
3110 + inode->i_gid = h_inode->i_gid;
3111 + au_cpup_attr_timesizes(inode);
3112 + au_cpup_attr_flags(inode, h_inode);
3115 +void au_cpup_igen(struct inode *inode, struct inode *h_inode)
3117 + struct au_iinfo *iinfo = au_ii(inode);
3119 + IiMustWriteLock(inode);
3121 + iinfo->ii_higen = h_inode->i_generation;
3122 + iinfo->ii_hsb1 = h_inode->i_sb;
3125 +void au_cpup_attr_all(struct inode *inode, int force)
3127 + struct inode *h_inode;
3129 + h_inode = au_h_iptr(inode, au_ibstart(inode));
3130 + au_cpup_attr_changeable(inode);
3131 + if (inode->i_nlink > 0)
3132 + au_cpup_attr_nlink(inode, force);
3133 + inode->i_rdev = h_inode->i_rdev;
3134 + inode->i_blkbits = h_inode->i_blkbits;
3135 + au_cpup_igen(inode, h_inode);
3138 +/* ---------------------------------------------------------------------- */
3140 +/* Note: dt_dentry and dt_h_dentry are not dget/dput-ed */
3142 +/* keep the timestamps of the parent dir when cpup */
3143 +void au_dtime_store(struct au_dtime *dt, struct dentry *dentry,
3144 + struct path *h_path)
3146 + struct inode *h_inode;
3148 + dt->dt_dentry = dentry;
3149 + dt->dt_h_path = *h_path;
3150 + h_inode = h_path->dentry->d_inode;
3151 + dt->dt_atime = h_inode->i_atime;
3152 + dt->dt_mtime = h_inode->i_mtime;
3156 +void au_dtime_revert(struct au_dtime *dt)
3158 + struct iattr attr;
3161 + attr.ia_atime = dt->dt_atime;
3162 + attr.ia_mtime = dt->dt_mtime;
3163 + attr.ia_valid = ATTR_FORCE | ATTR_MTIME | ATTR_MTIME_SET
3164 + | ATTR_ATIME | ATTR_ATIME_SET;
3166 + err = vfsub_notify_change(&dt->dt_h_path, &attr);
3167 + if (unlikely(err))
3168 + AuWarn("restoring timestamps failed(%d). ignored\n", err);
3171 +/* ---------------------------------------------------------------------- */
3173 +static noinline_for_stack
3174 +int cpup_iattr(struct dentry *dst, aufs_bindex_t bindex, struct dentry *h_src)
3178 + struct path h_path;
3179 + struct inode *h_isrc, *h_idst;
3181 + h_path.dentry = au_h_dptr(dst, bindex);
3182 + h_idst = h_path.dentry->d_inode;
3183 + h_path.mnt = au_sbr_mnt(dst->d_sb, bindex);
3184 + h_isrc = h_src->d_inode;
3185 + ia.ia_valid = ATTR_FORCE | ATTR_UID | ATTR_GID
3186 + | ATTR_ATIME | ATTR_MTIME
3187 + | ATTR_ATIME_SET | ATTR_MTIME_SET;
3188 + ia.ia_uid = h_isrc->i_uid;
3189 + ia.ia_gid = h_isrc->i_gid;
3190 + ia.ia_atime = h_isrc->i_atime;
3191 + ia.ia_mtime = h_isrc->i_mtime;
3192 + if (h_idst->i_mode != h_isrc->i_mode
3193 + && !S_ISLNK(h_idst->i_mode)) {
3194 + ia.ia_valid |= ATTR_MODE;
3195 + ia.ia_mode = h_isrc->i_mode;
3197 + sbits = !!(h_isrc->i_mode & (S_ISUID | S_ISGID));
3198 + au_cpup_attr_flags(h_idst, h_isrc);
3199 + err = vfsub_notify_change(&h_path, &ia);
3201 + /* is this nfs only? */
3202 + if (!err && sbits && au_test_nfs(h_path.dentry->d_sb)) {
3203 + ia.ia_valid = ATTR_FORCE | ATTR_MODE;
3204 + ia.ia_mode = h_isrc->i_mode;
3205 + err = vfsub_notify_change(&h_path, &ia);
3211 +/* ---------------------------------------------------------------------- */
3213 +static int au_do_copy_file(struct file *dst, struct file *src, loff_t len,
3214 + char *buf, unsigned long blksize)
3217 + size_t sz, rbytes, wbytes;
3218 + unsigned char all_zero;
3220 + struct mutex *h_mtx;
3221 + /* reduce stack usage */
3224 + zp = page_address(ZERO_PAGE(0));
3225 + if (unlikely(!zp))
3226 + return -ENOMEM; /* possible? */
3231 + AuDbg("len %lld\n", len);
3233 + if (len < blksize)
3237 + /* todo: signal_pending? */
3238 + while (!rbytes || err == -EAGAIN || err == -EINTR) {
3239 + rbytes = vfsub_read_k(src, buf, sz, &src->f_pos);
3242 + if (unlikely(err < 0))
3246 + if (len >= rbytes && rbytes == blksize)
3247 + all_zero = !memcmp(buf, zp, rbytes);
3254 + b = vfsub_write_k(dst, p, wbytes, &dst->f_pos);
3256 + /* todo: signal_pending? */
3257 + if (unlikely(err == -EAGAIN || err == -EINTR))
3259 + if (unlikely(err < 0))
3268 + res = vfsub_llseek(dst, rbytes, SEEK_CUR);
3270 + if (unlikely(res < 0))
3277 + /* the last block may be a hole */
3278 + if (!err && all_zero) {
3279 + AuLabel(last hole);
3282 + if (au_test_nfs(dst->f_dentry->d_sb)) {
3283 + /* nfs requires this step to make last hole */
3284 + /* is this only nfs? */
3286 + /* todo: signal_pending? */
3287 + err = vfsub_write_k(dst, "\0", 1, &dst->f_pos);
3288 + } while (err == -EAGAIN || err == -EINTR);
3295 + ia->ia_size = dst->f_pos;
3296 + ia->ia_valid = ATTR_SIZE | ATTR_FILE;
3297 + ia->ia_file = dst;
3298 + h_mtx = &dst->f_dentry->d_inode->i_mutex;
3299 + mutex_lock_nested(h_mtx, AuLsc_I_CHILD2);
3300 + err = vfsub_notify_change(&dst->f_path, ia);
3301 + mutex_unlock(h_mtx);
3308 +int au_copy_file(struct file *dst, struct file *src, loff_t len)
3311 + unsigned long blksize;
3312 + unsigned char do_kfree;
3316 + blksize = dst->f_dentry->d_sb->s_blocksize;
3317 + if (!blksize || PAGE_SIZE < blksize)
3318 + blksize = PAGE_SIZE;
3319 + AuDbg("blksize %lu\n", blksize);
3320 + do_kfree = (blksize != PAGE_SIZE && blksize >= sizeof(struct iattr *));
3322 + buf = kmalloc(blksize, GFP_NOFS);
3324 + buf = (void *)__get_free_page(GFP_NOFS);
3325 + if (unlikely(!buf))
3328 + if (len > (1 << 22))
3329 + AuDbg("copying a large file %lld\n", (long long)len);
3333 + err = au_do_copy_file(dst, src, len, buf, blksize);
3337 + free_page((unsigned long)buf);
3344 + * to support a sparse file which is opened with O_APPEND,
3345 + * we need to close the file.
3347 +static int au_cp_regular(struct dentry *dentry, aufs_bindex_t bdst,
3348 + aufs_bindex_t bsrc, loff_t len)
3351 + enum { SRC, DST };
3353 + aufs_bindex_t bindex;
3354 + unsigned int flags;
3355 + struct dentry *dentry;
3356 + struct file *file;
3357 + void *label, *label_file;
3361 + .flags = O_RDONLY | O_NOATIME | O_LARGEFILE,
3364 + .label_file = &&out_src
3368 + .flags = O_WRONLY | O_NOATIME | O_LARGEFILE,
3370 + .label = &&out_src,
3371 + .label_file = &&out_dst
3374 + struct super_block *sb;
3376 + /* bsrc branch can be ro/rw. */
3377 + sb = dentry->d_sb;
3379 + for (i = 0; i < 2; i++, f++) {
3380 + f->dentry = au_h_dptr(dentry, f->bindex);
3381 + f->file = au_h_open(dentry, f->bindex, f->flags, /*file*/NULL);
3382 + err = PTR_ERR(f->file);
3383 + if (IS_ERR(f->file))
3386 + if (unlikely(!f->file->f_op))
3387 + goto *f->label_file;
3390 + /* try stopping to update while we copyup */
3391 + IMustLock(file[SRC].dentry->d_inode);
3392 + err = au_copy_file(file[DST].file, file[SRC].file, len);
3395 + fput(file[DST].file);
3396 + au_sbr_put(sb, file[DST].bindex);
3398 + fput(file[SRC].file);
3399 + au_sbr_put(sb, file[SRC].bindex);
3404 +static int au_do_cpup_regular(struct dentry *dentry, aufs_bindex_t bdst,
3405 + aufs_bindex_t bsrc, loff_t len,
3406 + struct inode *h_dir, struct path *h_path)
3412 + l = i_size_read(au_h_iptr(dentry->d_inode, bsrc));
3413 + if (len == -1 || l < len)
3416 + err = au_cp_regular(dentry, bdst, bsrc, len);
3418 + goto out; /* success */
3420 + rerr = vfsub_unlink(h_dir, h_path, /*force*/0);
3422 + AuIOErr("failed unlinking cpup-ed %.*s(%d, %d)\n",
3423 + AuDLNPair(h_path->dentry), err, rerr);
3431 +static int au_do_cpup_symlink(struct path *h_path, struct dentry *h_src,
3432 + struct inode *h_dir)
3435 + mm_segment_t old_fs;
3439 + if (unlikely(!h_src->d_inode->i_op->readlink))
3443 + sym = __getname();
3444 + if (unlikely(!sym))
3447 + old_fs = get_fs();
3448 + set_fs(KERNEL_DS);
3449 + symlen = h_src->d_inode->i_op->readlink(h_src, (char __user *)sym,
3456 + err = vfsub_symlink(h_dir, h_path, sym);
3464 +/* return with the lower dst inode is locked */
3465 +static noinline_for_stack
3466 +int cpup_entry(struct dentry *dentry, aufs_bindex_t bdst,
3467 + aufs_bindex_t bsrc, loff_t len, unsigned int flags,
3468 + struct dentry *dst_parent)
3472 + unsigned int mnt_flags;
3473 + unsigned char isdir;
3474 + const unsigned char do_dt = !!au_ftest_cpup(flags, DTIME);
3475 + struct au_dtime dt;
3476 + struct path h_path;
3477 + struct dentry *h_src, *h_dst, *h_parent;
3478 + struct inode *h_inode, *h_dir;
3479 + struct super_block *sb;
3481 + /* bsrc branch can be ro/rw. */
3482 + h_src = au_h_dptr(dentry, bsrc);
3483 + h_inode = h_src->d_inode;
3484 + AuDebugOn(h_inode != au_h_iptr(dentry->d_inode, bsrc));
3486 + /* try stopping to be referenced while we are creating */
3487 + h_dst = au_h_dptr(dentry, bdst);
3488 + h_parent = h_dst->d_parent; /* dir inode is locked */
3489 + h_dir = h_parent->d_inode;
3491 + AuDebugOn(h_parent != h_dst->d_parent);
3493 + sb = dentry->d_sb;
3494 + h_path.mnt = au_sbr_mnt(sb, bdst);
3496 + h_path.dentry = h_parent;
3497 + au_dtime_store(&dt, dst_parent, &h_path);
3499 + h_path.dentry = h_dst;
3502 + mode = h_inode->i_mode;
3503 + switch (mode & S_IFMT) {
3505 + /* try stopping to update while we are referencing */
3506 + IMustLock(h_inode);
3507 + err = vfsub_create(h_dir, &h_path, mode | S_IWUSR);
3509 + err = au_do_cpup_regular
3510 + (dentry, bdst, bsrc, len,
3511 + au_h_iptr(dst_parent->d_inode, bdst), &h_path);
3515 + err = vfsub_mkdir(h_dir, &h_path, mode);
3518 + * strange behaviour from the users view,
3519 + * particularry setattr case
3521 + if (au_ibstart(dst_parent->d_inode) == bdst)
3522 + au_cpup_attr_nlink(dst_parent->d_inode,
3524 + au_cpup_attr_nlink(dentry->d_inode, /*force*/1);
3528 + err = au_do_cpup_symlink(&h_path, h_src, h_dir);
3532 + AuDebugOn(!capable(CAP_MKNOD));
3536 + err = vfsub_mknod(h_dir, &h_path, mode, h_inode->i_rdev);
3539 + AuIOErr("Unknown inode type 0%o\n", mode);
3543 + mnt_flags = au_mntflags(sb);
3544 + if (!au_opt_test(mnt_flags, UDBA_NONE)
3546 + && au_opt_test(mnt_flags, XINO)
3547 + && h_inode->i_nlink == 1
3548 + /* todo: unnecessary? */
3549 + /* && dentry->d_inode->i_nlink == 1 */
3551 + && !au_ftest_cpup(flags, KEEPLINO))
3552 + au_xino_write(sb, bsrc, h_inode->i_ino, /*ino*/0);
3553 + /* ignore this error */
3556 + au_dtime_revert(&dt);
3561 + * copyup the @dentry from @bsrc to @bdst.
3562 + * the caller must set the both of lower dentries.
3563 + * @len is for truncating when it is -1 copyup the entire file.
3564 + * in link/rename cases, @dst_parent may be different from the real one.
3566 +static int au_cpup_single(struct dentry *dentry, aufs_bindex_t bdst,
3567 + aufs_bindex_t bsrc, loff_t len, unsigned int flags,
3568 + struct dentry *dst_parent)
3571 + aufs_bindex_t old_ibstart;
3572 + unsigned char isdir, plink;
3573 + struct au_dtime dt;
3574 + struct path h_path;
3575 + struct dentry *h_src, *h_dst, *h_parent;
3576 + struct inode *dst_inode, *h_dir, *inode;
3577 + struct super_block *sb;
3579 + AuDebugOn(bsrc <= bdst);
3581 + sb = dentry->d_sb;
3582 + h_path.mnt = au_sbr_mnt(sb, bdst);
3583 + h_dst = au_h_dptr(dentry, bdst);
3584 + h_parent = h_dst->d_parent; /* dir inode is locked */
3585 + h_dir = h_parent->d_inode;
3588 + h_src = au_h_dptr(dentry, bsrc);
3589 + inode = dentry->d_inode;
3592 + dst_parent = dget_parent(dentry);
3596 + plink = !!au_opt_test(au_mntflags(sb), PLINK);
3597 + dst_inode = au_h_iptr(inode, bdst);
3599 + if (unlikely(!plink)) {
3601 + AuIOErr("i%lu exists on a upper branch "
3602 + "but plink is disabled\n", inode->i_ino);
3606 + if (dst_inode->i_nlink) {
3607 + const int do_dt = au_ftest_cpup(flags, DTIME);
3609 + h_src = au_plink_lkup(inode, bdst);
3610 + err = PTR_ERR(h_src);
3611 + if (IS_ERR(h_src))
3613 + if (unlikely(!h_src->d_inode)) {
3615 + AuIOErr("i%lu exists on a upper branch "
3616 + "but plink is broken\n", inode->i_ino);
3622 + h_path.dentry = h_parent;
3623 + au_dtime_store(&dt, dst_parent, &h_path);
3625 + h_path.dentry = h_dst;
3626 + err = vfsub_link(h_src, h_dir, &h_path);
3628 + au_dtime_revert(&dt);
3632 + /* todo: cpup_wh_file? */
3634 + au_update_brange(inode, 1);
3637 + old_ibstart = au_ibstart(inode);
3638 + err = cpup_entry(dentry, bdst, bsrc, len, flags, dst_parent);
3639 + if (unlikely(err))
3641 + dst_inode = h_dst->d_inode;
3642 + mutex_lock_nested(&dst_inode->i_mutex, AuLsc_I_CHILD2);
3644 + err = cpup_iattr(dentry, bdst, h_src);
3645 + isdir = S_ISDIR(dst_inode->i_mode);
3647 + if (bdst < old_ibstart)
3648 + au_set_ibstart(inode, bdst);
3649 + au_set_h_iptr(inode, bdst, au_igrab(dst_inode),
3650 + au_hi_flags(inode, isdir));
3651 + mutex_unlock(&dst_inode->i_mutex);
3653 + && h_src->d_inode->i_nlink > 1
3655 + au_plink_append(inode, bdst, h_dst);
3656 + goto out; /* success */
3660 + h_path.dentry = h_parent;
3661 + mutex_unlock(&dst_inode->i_mutex);
3662 + au_dtime_store(&dt, dst_parent, &h_path);
3663 + h_path.dentry = h_dst;
3665 + rerr = vfsub_unlink(h_dir, &h_path, /*force*/0);
3667 + rerr = vfsub_rmdir(h_dir, &h_path);
3668 + au_dtime_revert(&dt);
3670 + AuIOErr("failed removing broken entry(%d, %d)\n", err, rerr);
3679 +struct au_cpup_single_args {
3681 + struct dentry *dentry;
3682 + aufs_bindex_t bdst, bsrc;
3684 + unsigned int flags;
3685 + struct dentry *dst_parent;
3688 +static void au_call_cpup_single(void *args)
3690 + struct au_cpup_single_args *a = args;
3691 + *a->errp = au_cpup_single(a->dentry, a->bdst, a->bsrc, a->len,
3692 + a->flags, a->dst_parent);
3695 +int au_sio_cpup_single(struct dentry *dentry, aufs_bindex_t bdst,
3696 + aufs_bindex_t bsrc, loff_t len, unsigned int flags,
3697 + struct dentry *dst_parent)
3701 + struct dentry *h_dentry;
3703 + h_dentry = au_h_dptr(dentry, bsrc);
3704 + mode = h_dentry->d_inode->i_mode & S_IFMT;
3705 + if ((mode != S_IFCHR && mode != S_IFBLK)
3706 + || capable(CAP_MKNOD))
3707 + err = au_cpup_single(dentry, bdst, bsrc, len, flags,
3710 + struct au_cpup_single_args args = {
3717 + .dst_parent = dst_parent
3719 + wkq_err = au_wkq_wait(au_call_cpup_single, &args);
3720 + if (unlikely(wkq_err))
3728 + * copyup the @dentry from the first active lower branch to @bdst,
3729 + * using au_cpup_single().
3731 +static int au_cpup_simple(struct dentry *dentry, aufs_bindex_t bdst, loff_t len,
3732 + unsigned int flags)
3735 + aufs_bindex_t bsrc, bend;
3737 + bend = au_dbend(dentry);
3738 + for (bsrc = bdst + 1; bsrc <= bend; bsrc++)
3739 + if (au_h_dptr(dentry, bsrc))
3742 + err = au_lkup_neg(dentry, bdst);
3744 + err = au_cpup_single(dentry, bdst, bsrc, len, flags, NULL);
3746 + return 0; /* success */
3749 + au_set_h_dptr(dentry, bdst, NULL);
3750 + au_set_dbstart(dentry, bsrc);
3756 +struct au_cpup_simple_args {
3758 + struct dentry *dentry;
3759 + aufs_bindex_t bdst;
3761 + unsigned int flags;
3764 +static void au_call_cpup_simple(void *args)
3766 + struct au_cpup_simple_args *a = args;
3767 + *a->errp = au_cpup_simple(a->dentry, a->bdst, a->len, a->flags);
3770 +int au_sio_cpup_simple(struct dentry *dentry, aufs_bindex_t bdst, loff_t len,
3771 + unsigned int flags)
3774 + unsigned char do_sio;
3775 + struct dentry *parent;
3776 + struct inode *h_dir;
3778 + parent = dget_parent(dentry);
3779 + h_dir = au_h_iptr(parent->d_inode, bdst);
3780 + do_sio = !!au_test_h_perm_sio(h_dir, MAY_EXEC | MAY_WRITE);
3783 + * testing CAP_MKNOD is for generic fs,
3784 + * but CAP_FSETID is for xfs only, currently.
3786 + umode_t mode = dentry->d_inode->i_mode;
3787 + do_sio = (((mode & (S_IFCHR | S_IFBLK))
3788 + && !capable(CAP_MKNOD))
3789 + || ((mode & (S_ISUID | S_ISGID))
3790 + && !capable(CAP_FSETID)));
3793 + err = au_cpup_simple(dentry, bdst, len, flags);
3795 + struct au_cpup_simple_args args = {
3802 + wkq_err = au_wkq_wait(au_call_cpup_simple, &args);
3803 + if (unlikely(wkq_err))
3811 +/* ---------------------------------------------------------------------- */
3814 + * copyup the deleted file for writing.
3816 +static int au_do_cpup_wh(struct dentry *dentry, aufs_bindex_t bdst,
3817 + struct dentry *wh_dentry, struct file *file,
3821 + aufs_bindex_t bstart;
3822 + struct au_dinfo *dinfo;
3823 + struct dentry *h_d_dst, *h_d_start;
3825 + dinfo = au_di(dentry);
3826 + AuRwMustWriteLock(&dinfo->di_rwsem);
3828 + bstart = dinfo->di_bstart;
3829 + h_d_dst = dinfo->di_hdentry[0 + bdst].hd_dentry;
3830 + dinfo->di_bstart = bdst;
3831 + dinfo->di_hdentry[0 + bdst].hd_dentry = wh_dentry;
3832 + h_d_start = dinfo->di_hdentry[0 + bstart].hd_dentry;
3834 + dinfo->di_hdentry[0 + bstart].hd_dentry
3835 + = au_h_fptr(file, au_fbstart(file))->f_dentry;
3836 + err = au_cpup_single(dentry, bdst, bstart, len, !AuCpup_DTIME,
3837 + /*h_parent*/NULL);
3838 + if (!err && file) {
3839 + err = au_reopen_nondir(file);
3840 + dinfo->di_hdentry[0 + bstart].hd_dentry = h_d_start;
3842 + dinfo->di_hdentry[0 + bdst].hd_dentry = h_d_dst;
3843 + dinfo->di_bstart = bstart;
3848 +static int au_cpup_wh(struct dentry *dentry, aufs_bindex_t bdst, loff_t len,
3849 + struct file *file)
3852 + struct au_dtime dt;
3853 + struct dentry *parent, *h_parent, *wh_dentry;
3854 + struct au_branch *br;
3855 + struct path h_path;
3857 + br = au_sbr(dentry->d_sb, bdst);
3858 + parent = dget_parent(dentry);
3859 + h_parent = au_h_dptr(parent, bdst);
3860 + wh_dentry = au_whtmp_lkup(h_parent, br, &dentry->d_name);
3861 + err = PTR_ERR(wh_dentry);
3862 + if (IS_ERR(wh_dentry))
3865 + h_path.dentry = h_parent;
3866 + h_path.mnt = br->br_mnt;
3867 + au_dtime_store(&dt, parent, &h_path);
3868 + err = au_do_cpup_wh(dentry, bdst, wh_dentry, file, len);
3869 + if (unlikely(err))
3873 + h_path.dentry = wh_dentry;
3874 + err = vfsub_unlink(h_parent->d_inode, &h_path, /*force*/0);
3875 + if (unlikely(err)) {
3876 + AuIOErr("failed remove copied-up tmp file %.*s(%d)\n",
3877 + AuDLNPair(wh_dentry), err);
3880 + au_dtime_revert(&dt);
3881 + au_set_hi_wh(dentry->d_inode, bdst, wh_dentry);
3890 +struct au_cpup_wh_args {
3892 + struct dentry *dentry;
3893 + aufs_bindex_t bdst;
3895 + struct file *file;
3898 +static void au_call_cpup_wh(void *args)
3900 + struct au_cpup_wh_args *a = args;
3901 + *a->errp = au_cpup_wh(a->dentry, a->bdst, a->len, a->file);
3904 +int au_sio_cpup_wh(struct dentry *dentry, aufs_bindex_t bdst, loff_t len,
3905 + struct file *file)
3908 + struct dentry *parent, *h_orph, *h_parent, *h_dentry;
3909 + struct inode *dir, *h_dir, *h_tmpdir, *h_inode;
3910 + struct au_wbr *wbr;
3912 + parent = dget_parent(dentry);
3913 + dir = parent->d_inode;
3916 + h_dir = au_igrab(au_h_iptr(dir, bdst));
3918 + if (!h_dir->i_nlink) {
3919 + wbr = au_sbr(dentry->d_sb, bdst)->br_wbr;
3920 + h_orph = wbr->wbr_orph;
3922 + h_parent = dget(au_h_dptr(parent, bdst));
3923 + au_set_h_dptr(parent, bdst, NULL);
3924 + au_set_h_dptr(parent, bdst, dget(h_orph));
3925 + h_tmpdir = h_orph->d_inode;
3926 + au_set_h_iptr(dir, bdst, NULL, 0);
3927 + au_set_h_iptr(dir, bdst, au_igrab(h_tmpdir), /*flags*/0);
3929 + /* this temporary unlock is safe */
3931 + h_dentry = au_h_fptr(file, au_fbstart(file))->f_dentry;
3933 + h_dentry = au_h_dptr(dentry, au_dbstart(dentry));
3934 + h_inode = h_dentry->d_inode;
3935 + IMustLock(h_inode);
3936 + mutex_unlock(&h_inode->i_mutex);
3937 + mutex_lock_nested(&h_tmpdir->i_mutex, AuLsc_I_PARENT3);
3938 + mutex_lock_nested(&h_inode->i_mutex, AuLsc_I_CHILD);
3941 + if (!au_test_h_perm_sio(h_tmpdir, MAY_EXEC | MAY_WRITE))
3942 + err = au_cpup_wh(dentry, bdst, len, file);
3944 + struct au_cpup_wh_args args = {
3951 + wkq_err = au_wkq_wait(au_call_cpup_wh, &args);
3952 + if (unlikely(wkq_err))
3957 + mutex_unlock(&h_tmpdir->i_mutex);
3958 + au_set_h_iptr(dir, bdst, NULL, 0);
3959 + au_set_h_iptr(dir, bdst, au_igrab(h_dir), /*flags*/0);
3960 + au_set_h_dptr(parent, bdst, NULL);
3961 + au_set_h_dptr(parent, bdst, h_parent);
3969 +/* ---------------------------------------------------------------------- */
3972 + * generic routine for both of copy-up and copy-down.
3974 +/* cf. revalidate function in file.c */
3975 +int au_cp_dirs(struct dentry *dentry, aufs_bindex_t bdst,
3976 + int (*cp)(struct dentry *dentry, aufs_bindex_t bdst,
3977 + struct dentry *h_parent, void *arg),
3981 + struct au_pin pin;
3982 + struct dentry *d, *parent, *h_parent, *real_parent;
3985 + parent = dget_parent(dentry);
3986 + if (IS_ROOT(parent))
3989 + au_pin_init(&pin, dentry, bdst, AuLsc_DI_PARENT2, AuLsc_I_PARENT2,
3990 + au_opt_udba(dentry->d_sb), AuPin_MNT_WRITE);
3992 + /* do not use au_dpage */
3993 + real_parent = parent;
3996 + parent = dget_parent(dentry);
3997 + h_parent = au_h_dptr(parent, bdst);
3999 + goto out; /* success */
4001 + /* find top dir which is necessary to cpup */
4005 + parent = dget_parent(d);
4006 + di_read_lock_parent3(parent, !AuLock_IR);
4007 + h_parent = au_h_dptr(parent, bdst);
4008 + di_read_unlock(parent, !AuLock_IR);
4009 + } while (!h_parent);
4011 + if (d != real_parent)
4012 + di_write_lock_child3(d);
4014 + /* somebody else might create while we were sleeping */
4015 + if (!au_h_dptr(d, bdst) || !au_h_dptr(d, bdst)->d_inode) {
4016 + if (au_h_dptr(d, bdst))
4017 + au_update_dbstart(d);
4019 + au_pin_set_dentry(&pin, d);
4020 + err = au_do_pin(&pin);
4022 + err = cp(d, bdst, h_parent, arg);
4027 + if (d != real_parent)
4028 + di_write_unlock(d);
4029 + if (unlikely(err))
4038 +static int au_cpup_dir(struct dentry *dentry, aufs_bindex_t bdst,
4039 + struct dentry *h_parent __maybe_unused ,
4040 + void *arg __maybe_unused)
4042 + return au_sio_cpup_simple(dentry, bdst, -1, AuCpup_DTIME);
4045 +int au_cpup_dirs(struct dentry *dentry, aufs_bindex_t bdst)
4047 + return au_cp_dirs(dentry, bdst, au_cpup_dir, NULL);
4050 +int au_test_and_cpup_dirs(struct dentry *dentry, aufs_bindex_t bdst)
4053 + struct dentry *parent;
4054 + struct inode *dir;
4056 + parent = dget_parent(dentry);
4057 + dir = parent->d_inode;
4059 + if (au_h_iptr(dir, bdst))
4062 + di_read_unlock(parent, AuLock_IR);
4063 + di_write_lock_parent(parent);
4064 + /* someone else might change our inode while we were sleeping */
4065 + if (!au_h_iptr(dir, bdst))
4066 + err = au_cpup_dirs(dentry, bdst);
4067 + di_downgrade_lock(parent, AuLock_IR);
4073 diff --git a/fs/aufs/cpup.h b/fs/aufs/cpup.h
4074 new file mode 100644
4075 index 0000000..29e2508
4077 +++ b/fs/aufs/cpup.h
4080 + * Copyright (C) 2005-2009 Junjiro R. Okajima
4082 + * This program, aufs is free software; you can redistribute it and/or modify
4083 + * it under the terms of the GNU General Public License as published by
4084 + * the Free Software Foundation; either version 2 of the License, or
4085 + * (at your option) any later version.
4087 + * This program is distributed in the hope that it will be useful,
4088 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
4089 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
4090 + * GNU General Public License for more details.
4092 + * You should have received a copy of the GNU General Public License
4093 + * along with this program; if not, write to the Free Software
4094 + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
4098 + * copy-up/down functions
4101 +#ifndef __AUFS_CPUP_H__
4102 +#define __AUFS_CPUP_H__
4106 +#include <linux/path.h>
4107 +#include <linux/time.h>
4108 +#include <linux/aufs_type.h>
4113 +void au_cpup_attr_flags(struct inode *dst, struct inode *src);
4114 +void au_cpup_attr_timesizes(struct inode *inode);
4115 +void au_cpup_attr_nlink(struct inode *inode, int force);
4116 +void au_cpup_attr_changeable(struct inode *inode);
4117 +void au_cpup_igen(struct inode *inode, struct inode *h_inode);
4118 +void au_cpup_attr_all(struct inode *inode, int force);
4120 +/* ---------------------------------------------------------------------- */
4123 +#define AuCpup_DTIME 1 /* do dtime_store/revert */
4124 +#define AuCpup_KEEPLINO (1 << 1) /* do not clear the lower xino,
4126 +#define au_ftest_cpup(flags, name) ((flags) & AuCpup_##name)
4127 +#define au_fset_cpup(flags, name) { (flags) |= AuCpup_##name; }
4128 +#define au_fclr_cpup(flags, name) { (flags) &= ~AuCpup_##name; }
4130 +int au_copy_file(struct file *dst, struct file *src, loff_t len);
4131 +int au_sio_cpup_single(struct dentry *dentry, aufs_bindex_t bdst,
4132 + aufs_bindex_t bsrc, loff_t len, unsigned int flags,
4133 + struct dentry *dst_parent);
4134 +int au_sio_cpup_simple(struct dentry *dentry, aufs_bindex_t bdst, loff_t len,
4135 + unsigned int flags);
4136 +int au_sio_cpup_wh(struct dentry *dentry, aufs_bindex_t bdst, loff_t len,
4137 + struct file *file);
4139 +int au_cp_dirs(struct dentry *dentry, aufs_bindex_t bdst,
4140 + int (*cp)(struct dentry *dentry, aufs_bindex_t bdst,
4141 + struct dentry *h_parent, void *arg),
4143 +int au_cpup_dirs(struct dentry *dentry, aufs_bindex_t bdst);
4144 +int au_test_and_cpup_dirs(struct dentry *dentry, aufs_bindex_t bdst);
4146 +/* ---------------------------------------------------------------------- */
4148 +/* keep timestamps when copyup */
4150 + struct dentry *dt_dentry;
4151 + struct path dt_h_path;
4152 + struct timespec dt_atime, dt_mtime;
4154 +void au_dtime_store(struct au_dtime *dt, struct dentry *dentry,
4155 + struct path *h_path);
4156 +void au_dtime_revert(struct au_dtime *dt);
4158 +#endif /* __KERNEL__ */
4159 +#endif /* __AUFS_CPUP_H__ */
4160 diff --git a/fs/aufs/dbgaufs.c b/fs/aufs/dbgaufs.c
4161 new file mode 100644
4162 index 0000000..6b19d09
4164 +++ b/fs/aufs/dbgaufs.c
4167 + * Copyright (C) 2005-2009 Junjiro R. Okajima
4169 + * This program, aufs is free software; you can redistribute it and/or modify
4170 + * it under the terms of the GNU General Public License as published by
4171 + * the Free Software Foundation; either version 2 of the License, or
4172 + * (at your option) any later version.
4174 + * This program is distributed in the hope that it will be useful,
4175 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
4176 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
4177 + * GNU General Public License for more details.
4179 + * You should have received a copy of the GNU General Public License
4180 + * along with this program; if not, write to the Free Software
4181 + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
4185 + * debugfs interface
4188 +#include <linux/debugfs.h>
4191 +#ifndef CONFIG_SYSFS
4192 +#error DEBUG_FS depends upon SYSFS
4195 +static struct dentry *dbgaufs;
4196 +static const mode_t dbgaufs_mode = S_IRUSR | S_IRGRP | S_IROTH;
4198 +/* 20 is max digits length of ulong 64 */
4199 +struct dbgaufs_arg {
4205 + * common function for all XINO files
4207 +static int dbgaufs_xi_release(struct inode *inode __maybe_unused,
4208 + struct file *file)
4210 + kfree(file->private_data);
4214 +static int dbgaufs_xi_open(struct file *xf, struct file *file, int do_fcnt)
4218 + struct dbgaufs_arg *p;
4221 + p = kmalloc(sizeof(*p), GFP_NOFS);
4227 + file->private_data = p;
4231 + err = vfs_getattr(xf->f_vfsmnt, xf->f_dentry, &st);
4235 + (p->a, sizeof(p->a), "%ld, %llux%lu %lld\n",
4236 + (long)file_count(xf), st.blocks, st.blksize,
4237 + (long long)st.size);
4239 + p->n = snprintf(p->a, sizeof(p->a), "%llux%lu %lld\n",
4240 + st.blocks, st.blksize,
4241 + (long long)st.size);
4242 + AuDebugOn(p->n >= sizeof(p->a));
4244 + p->n = snprintf(p->a, sizeof(p->a), "err %d\n", err);
4253 +static ssize_t dbgaufs_xi_read(struct file *file, char __user *buf,
4254 + size_t count, loff_t *ppos)
4256 + struct dbgaufs_arg *p;
4258 + p = file->private_data;
4259 + return simple_read_from_buffer(buf, count, ppos, p->a, p->n);
4262 +/* ---------------------------------------------------------------------- */
4264 +static int dbgaufs_xib_open(struct inode *inode, struct file *file)
4267 + struct au_sbinfo *sbinfo;
4268 + struct super_block *sb;
4270 + sbinfo = inode->i_private;
4271 + sb = sbinfo->si_sb;
4272 + si_noflush_read_lock(sb);
4273 + err = dbgaufs_xi_open(sbinfo->si_xib, file, /*do_fcnt*/0);
4274 + si_read_unlock(sb);
4278 +static struct file_operations dbgaufs_xib_fop = {
4279 + .open = dbgaufs_xib_open,
4280 + .release = dbgaufs_xi_release,
4281 + .read = dbgaufs_xi_read
4284 +/* ---------------------------------------------------------------------- */
4286 +#define DbgaufsXi_PREFIX "xi"
4288 +static int dbgaufs_xino_open(struct inode *inode, struct file *file)
4292 + struct au_sbinfo *sbinfo;
4293 + struct super_block *sb;
4295 + struct qstr *name;
4299 + name = &file->f_dentry->d_name;
4300 + if (unlikely(name->len < sizeof(DbgaufsXi_PREFIX)
4301 + || memcmp(name->name, DbgaufsXi_PREFIX,
4302 + sizeof(DbgaufsXi_PREFIX) - 1)))
4304 + err = strict_strtol(name->name + sizeof(DbgaufsXi_PREFIX) - 1, 10, &l);
4305 + if (unlikely(err))
4308 + sbinfo = inode->i_private;
4309 + sb = sbinfo->si_sb;
4310 + si_noflush_read_lock(sb);
4311 + if (l <= au_sbend(sb)) {
4312 + xf = au_sbr(sb, (aufs_bindex_t)l)->br_xino.xi_file;
4313 + err = dbgaufs_xi_open(xf, file, /*do_fcnt*/1);
4316 + si_read_unlock(sb);
4322 +static struct file_operations dbgaufs_xino_fop = {
4323 + .open = dbgaufs_xino_open,
4324 + .release = dbgaufs_xi_release,
4325 + .read = dbgaufs_xi_read
4328 +void dbgaufs_brs_del(struct super_block *sb, aufs_bindex_t bindex)
4330 + aufs_bindex_t bend;
4331 + struct au_branch *br;
4332 + struct au_xino_file *xi;
4334 + if (!au_sbi(sb)->si_dbgaufs)
4337 + bend = au_sbend(sb);
4338 + for (; bindex <= bend; bindex++) {
4339 + br = au_sbr(sb, bindex);
4340 + xi = &br->br_xino;
4341 + if (xi->xi_dbgaufs) {
4342 + debugfs_remove(xi->xi_dbgaufs);
4343 + xi->xi_dbgaufs = NULL;
4348 +void dbgaufs_brs_add(struct super_block *sb, aufs_bindex_t bindex)
4350 + struct au_sbinfo *sbinfo;
4351 + struct dentry *parent;
4352 + struct au_branch *br;
4353 + struct au_xino_file *xi;
4354 + aufs_bindex_t bend;
4355 + char name[sizeof(DbgaufsXi_PREFIX) + 5]; /* "xi" bindex NULL */
4357 + sbinfo = au_sbi(sb);
4358 + parent = sbinfo->si_dbgaufs;
4362 + bend = au_sbend(sb);
4363 + for (; bindex <= bend; bindex++) {
4364 + snprintf(name, sizeof(name), DbgaufsXi_PREFIX "%d", bindex);
4365 + br = au_sbr(sb, bindex);
4366 + xi = &br->br_xino;
4367 + AuDebugOn(xi->xi_dbgaufs);
4368 + xi->xi_dbgaufs = debugfs_create_file(name, dbgaufs_mode, parent,
4369 + sbinfo, &dbgaufs_xino_fop);
4370 + /* ignore an error */
4371 + if (unlikely(!xi->xi_dbgaufs))
4372 + AuWarn1("failed %s under debugfs\n", name);
4376 +/* ---------------------------------------------------------------------- */
4378 +#ifdef CONFIG_AUFS_EXPORT
4379 +static int dbgaufs_xigen_open(struct inode *inode, struct file *file)
4382 + struct au_sbinfo *sbinfo;
4383 + struct super_block *sb;
4385 + sbinfo = inode->i_private;
4386 + sb = sbinfo->si_sb;
4387 + si_noflush_read_lock(sb);
4388 + err = dbgaufs_xi_open(sbinfo->si_xigen, file, /*do_fcnt*/0);
4389 + si_read_unlock(sb);
4393 +static struct file_operations dbgaufs_xigen_fop = {
4394 + .open = dbgaufs_xigen_open,
4395 + .release = dbgaufs_xi_release,
4396 + .read = dbgaufs_xi_read
4399 +static int dbgaufs_xigen_init(struct au_sbinfo *sbinfo)
4404 + * This function is a dynamic '__init' fucntion actually,
4405 + * so the tiny check for si_rwsem is unnecessary.
4407 + /* AuRwMustWriteLock(&sbinfo->si_rwsem); */
4410 + sbinfo->si_dbgaufs_xigen = debugfs_create_file
4411 + ("xigen", dbgaufs_mode, sbinfo->si_dbgaufs, sbinfo,
4412 + &dbgaufs_xigen_fop);
4413 + if (sbinfo->si_dbgaufs_xigen)
4419 +static int dbgaufs_xigen_init(struct au_sbinfo *sbinfo)
4423 +#endif /* CONFIG_AUFS_EXPORT */
4425 +/* ---------------------------------------------------------------------- */
4427 +void dbgaufs_si_fin(struct au_sbinfo *sbinfo)
4430 + * This function is a dynamic '__init' fucntion actually,
4431 + * so the tiny check for si_rwsem is unnecessary.
4433 + /* AuRwMustWriteLock(&sbinfo->si_rwsem); */
4435 + debugfs_remove_recursive(sbinfo->si_dbgaufs);
4436 + sbinfo->si_dbgaufs = NULL;
4437 + kobject_put(&sbinfo->si_kobj);
4440 +int dbgaufs_si_init(struct au_sbinfo *sbinfo)
4443 + char name[SysaufsSiNameLen];
4446 + * This function is a dynamic '__init' fucntion actually,
4447 + * so the tiny check for si_rwsem is unnecessary.
4449 + /* AuRwMustWriteLock(&sbinfo->si_rwsem); */
4453 + AuErr1("/debug/aufs is uninitialized\n");
4458 + sysaufs_name(sbinfo, name);
4459 + sbinfo->si_dbgaufs = debugfs_create_dir(name, dbgaufs);
4460 + if (unlikely(!sbinfo->si_dbgaufs))
4462 + kobject_get(&sbinfo->si_kobj);
4464 + sbinfo->si_dbgaufs_xib = debugfs_create_file
4465 + ("xib", dbgaufs_mode, sbinfo->si_dbgaufs, sbinfo,
4466 + &dbgaufs_xib_fop);
4467 + if (unlikely(!sbinfo->si_dbgaufs_xib))
4470 + err = dbgaufs_xigen_init(sbinfo);
4472 + goto out; /* success */
4475 + dbgaufs_si_fin(sbinfo);
4480 +/* ---------------------------------------------------------------------- */
4482 +void dbgaufs_fin(void)
4484 + debugfs_remove(dbgaufs);
4487 +int __init dbgaufs_init(void)
4492 + dbgaufs = debugfs_create_dir(AUFS_NAME, NULL);
4497 diff --git a/fs/aufs/dbgaufs.h b/fs/aufs/dbgaufs.h
4498 new file mode 100644
4499 index 0000000..3481fc2
4501 +++ b/fs/aufs/dbgaufs.h
4504 + * Copyright (C) 2005-2009 Junjiro R. Okajima
4506 + * This program, aufs is free software; you can redistribute it and/or modify
4507 + * it under the terms of the GNU General Public License as published by
4508 + * the Free Software Foundation; either version 2 of the License, or
4509 + * (at your option) any later version.
4511 + * This program is distributed in the hope that it will be useful,
4512 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
4513 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
4514 + * GNU General Public License for more details.
4516 + * You should have received a copy of the GNU General Public License
4517 + * along with this program; if not, write to the Free Software
4518 + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
4522 + * debugfs interface
4525 +#ifndef __DBGAUFS_H__
4526 +#define __DBGAUFS_H__
4530 +#include <linux/init.h>
4531 +#include <linux/aufs_type.h>
4533 +struct super_block;
4536 +#ifdef CONFIG_DEBUG_FS
4538 +void dbgaufs_brs_del(struct super_block *sb, aufs_bindex_t bindex);
4539 +void dbgaufs_brs_add(struct super_block *sb, aufs_bindex_t bindex);
4540 +void dbgaufs_si_fin(struct au_sbinfo *sbinfo);
4541 +int dbgaufs_si_init(struct au_sbinfo *sbinfo);
4542 +void dbgaufs_fin(void);
4543 +int __init dbgaufs_init(void);
4545 +AuStubVoid(dbgaufs_brs_del, struct super_block *sb, aufs_bindex_t bindex)
4546 +AuStubVoid(dbgaufs_brs_add, struct super_block *sb, aufs_bindex_t bindex)
4547 +AuStubVoid(dbgaufs_si_fin, struct au_sbinfo *sbinfo)
4548 +AuStubInt0(dbgaufs_si_init, struct au_sbinfo *sbinfo)
4549 +AuStubVoid(dbgaufs_fin, void)
4550 +AuStubInt0(__init dbgaufs_init, void)
4551 +#endif /* CONFIG_DEBUG_FS */
4553 +#endif /* __KERNEL__ */
4554 +#endif /* __DBGAUFS_H__ */
4555 diff --git a/fs/aufs/dcsub.c b/fs/aufs/dcsub.c
4556 new file mode 100644
4557 index 0000000..43a8cb4
4559 +++ b/fs/aufs/dcsub.c
4562 + * Copyright (C) 2005-2009 Junjiro R. Okajima
4564 + * This program, aufs is free software; you can redistribute it and/or modify
4565 + * it under the terms of the GNU General Public License as published by
4566 + * the Free Software Foundation; either version 2 of the License, or
4567 + * (at your option) any later version.
4569 + * This program is distributed in the hope that it will be useful,
4570 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
4571 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
4572 + * GNU General Public License for more details.
4574 + * You should have received a copy of the GNU General Public License
4575 + * along with this program; if not, write to the Free Software
4576 + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
4580 + * sub-routines for dentry cache
4585 +static void au_dpage_free(struct au_dpage *dpage)
4588 + struct dentry **p;
4590 + p = dpage->dentries;
4591 + for (i = 0; i < dpage->ndentry; i++)
4593 + free_page((unsigned long)dpage->dentries);
4596 +int au_dpages_init(struct au_dcsub_pages *dpages, gfp_t gfp)
4602 + dpages->dpages = kmalloc(sizeof(*dpages->dpages), gfp);
4603 + if (unlikely(!dpages->dpages))
4606 + p = (void *)__get_free_page(gfp);
4610 + dpages->dpages[0].ndentry = 0;
4611 + dpages->dpages[0].dentries = p;
4612 + dpages->ndpage = 1;
4613 + return 0; /* success */
4616 + kfree(dpages->dpages);
4621 +void au_dpages_free(struct au_dcsub_pages *dpages)
4624 + struct au_dpage *p;
4626 + p = dpages->dpages;
4627 + for (i = 0; i < dpages->ndpage; i++)
4628 + au_dpage_free(p++);
4629 + kfree(dpages->dpages);
4632 +static int au_dpages_append(struct au_dcsub_pages *dpages,
4633 + struct dentry *dentry, gfp_t gfp)
4636 + struct au_dpage *dpage;
4639 + dpage = dpages->dpages + dpages->ndpage - 1;
4640 + sz = PAGE_SIZE / sizeof(dentry);
4641 + if (unlikely(dpage->ndentry >= sz)) {
4642 + AuLabel(new dpage);
4644 + sz = dpages->ndpage * sizeof(*dpages->dpages);
4645 + p = au_kzrealloc(dpages->dpages, sz,
4646 + sz + sizeof(*dpages->dpages), gfp);
4650 + dpages->dpages = p;
4651 + dpage = dpages->dpages + dpages->ndpage;
4652 + p = (void *)__get_free_page(gfp);
4656 + dpage->ndentry = 0;
4657 + dpage->dentries = p;
4661 + dpage->dentries[dpage->ndentry++] = dget(dentry);
4662 + return 0; /* success */
4668 +int au_dcsub_pages(struct au_dcsub_pages *dpages, struct dentry *root,
4669 + au_dpages_test test, void *arg)
4672 + struct dentry *this_parent = root;
4673 + struct list_head *next;
4674 + struct super_block *sb = root->d_sb;
4677 + spin_lock(&dcache_lock);
4679 + next = this_parent->d_subdirs.next;
4681 + if (this_parent->d_sb == sb
4682 + && !IS_ROOT(this_parent)
4683 + && atomic_read(&this_parent->d_count)
4684 + && this_parent->d_inode
4685 + && (!test || test(this_parent, arg))) {
4686 + err = au_dpages_append(dpages, this_parent, GFP_ATOMIC);
4687 + if (unlikely(err))
4691 + while (next != &this_parent->d_subdirs) {
4692 + struct list_head *tmp = next;
4693 + struct dentry *dentry = list_entry(tmp, struct dentry,
4696 + if (/*d_unhashed(dentry) || */!dentry->d_inode)
4698 + if (!list_empty(&dentry->d_subdirs)) {
4699 + this_parent = dentry;
4702 + if (dentry->d_sb == sb
4703 + && atomic_read(&dentry->d_count)
4704 + && (!test || test(dentry, arg))) {
4705 + err = au_dpages_append(dpages, dentry, GFP_ATOMIC);
4706 + if (unlikely(err))
4711 + if (this_parent != root) {
4712 + next = this_parent->d_u.d_child.next;
4713 + this_parent = this_parent->d_parent; /* dcache_lock is locked */
4717 + spin_unlock(&dcache_lock);
4721 +int au_dcsub_pages_rev(struct au_dcsub_pages *dpages, struct dentry *dentry,
4722 + int do_include, au_dpages_test test, void *arg)
4727 + spin_lock(&dcache_lock);
4728 + if (do_include && (!test || test(dentry, arg))) {
4729 + err = au_dpages_append(dpages, dentry, GFP_ATOMIC);
4730 + if (unlikely(err))
4733 + while (!IS_ROOT(dentry)) {
4734 + dentry = dentry->d_parent; /* dcache_lock is locked */
4735 + if (!test || test(dentry, arg)) {
4736 + err = au_dpages_append(dpages, dentry, GFP_ATOMIC);
4737 + if (unlikely(err))
4743 + spin_unlock(&dcache_lock);
4748 +struct dentry *au_test_subdir(struct dentry *d1, struct dentry *d2)
4750 + struct dentry *trap, **dentries;
4752 + struct au_dcsub_pages dpages;
4753 + struct au_dpage *dpage;
4755 + trap = ERR_PTR(-ENOMEM);
4756 + err = au_dpages_init(&dpages, GFP_NOFS);
4757 + if (unlikely(err))
4759 + err = au_dcsub_pages_rev(&dpages, d1, /*do_include*/1, NULL, NULL);
4760 + if (unlikely(err))
4764 + for (i = 0; !err && i < dpages.ndpage; i++) {
4765 + dpage = dpages.dpages + i;
4766 + dentries = dpage->dentries;
4767 + for (j = 0; !err && j < dpage->ndentry; j++) {
4780 + au_dpages_free(&dpages);
4784 diff --git a/fs/aufs/dcsub.h b/fs/aufs/dcsub.h
4785 new file mode 100644
4786 index 0000000..bb934b4
4788 +++ b/fs/aufs/dcsub.h
4791 + * Copyright (C) 2005-2009 Junjiro R. Okajima
4793 + * This program, aufs is free software; you can redistribute it and/or modify
4794 + * it under the terms of the GNU General Public License as published by
4795 + * the Free Software Foundation; either version 2 of the License, or
4796 + * (at your option) any later version.
4798 + * This program is distributed in the hope that it will be useful,
4799 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
4800 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
4801 + * GNU General Public License for more details.
4803 + * You should have received a copy of the GNU General Public License
4804 + * along with this program; if not, write to the Free Software
4805 + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
4809 + * sub-routines for dentry cache
4812 +#ifndef __AUFS_DCSUB_H__
4813 +#define __AUFS_DCSUB_H__
4817 +#include <linux/types.h>
4823 + struct dentry **dentries;
4826 +struct au_dcsub_pages {
4828 + struct au_dpage *dpages;
4831 +/* ---------------------------------------------------------------------- */
4833 +int au_dpages_init(struct au_dcsub_pages *dpages, gfp_t gfp);
4834 +void au_dpages_free(struct au_dcsub_pages *dpages);
4835 +typedef int (*au_dpages_test)(struct dentry *dentry, void *arg);
4836 +int au_dcsub_pages(struct au_dcsub_pages *dpages, struct dentry *root,
4837 + au_dpages_test test, void *arg);
4838 +int au_dcsub_pages_rev(struct au_dcsub_pages *dpages, struct dentry *dentry,
4839 + int do_include, au_dpages_test test, void *arg);
4840 +struct dentry *au_test_subdir(struct dentry *d1, struct dentry *d2);
4842 +#endif /* __KERNEL__ */
4843 +#endif /* __AUFS_DCSUB_H__ */
4844 diff --git a/fs/aufs/debug.c b/fs/aufs/debug.c
4845 new file mode 100644
4846 index 0000000..5cfd707
4848 +++ b/fs/aufs/debug.c
4851 + * Copyright (C) 2005-2009 Junjiro R. Okajima
4853 + * This program, aufs is free software; you can redistribute it and/or modify
4854 + * it under the terms of the GNU General Public License as published by
4855 + * the Free Software Foundation; either version 2 of the License, or
4856 + * (at your option) any later version.
4858 + * This program is distributed in the hope that it will be useful,
4859 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
4860 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
4861 + * GNU General Public License for more details.
4863 + * You should have received a copy of the GNU General Public License
4864 + * along with this program; if not, write to the Free Software
4865 + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
4869 + * debug print functions
4872 +#include <linux/module.h>
4873 +#include <linux/vt_kern.h>
4877 +MODULE_PARM_DESC(debug, "debug print");
4878 +module_param_named(debug, aufs_debug, int, S_IRUGO | S_IWUSR | S_IWGRP);
4880 +char *au_plevel = KERN_DEBUG;
4881 +#define dpri(fmt, ...) do { \
4882 + if (au_debug_test()) \
4883 + printk("%s" fmt, au_plevel, ##__VA_ARGS__); \
4886 +/* ---------------------------------------------------------------------- */
4888 +void au_dpri_whlist(struct au_nhash *whlist)
4890 + unsigned long ul, n;
4891 + struct hlist_head *head;
4892 + struct au_vdir_wh *tpos;
4893 + struct hlist_node *pos;
4895 + n = whlist->nh_num;
4896 + head = whlist->nh_head;
4897 + for (ul = 0; ul < n; ul++) {
4898 + hlist_for_each_entry(tpos, pos, head, wh_hash)
4899 + dpri("b%d, %.*s, %d\n",
4901 + tpos->wh_str.len, tpos->wh_str.name,
4902 + tpos->wh_str.len);
4907 +void au_dpri_vdir(struct au_vdir *vdir)
4910 + union au_vdir_deblk_p p;
4913 + if (!vdir || IS_ERR(vdir)) {
4914 + dpri("err %ld\n", PTR_ERR(vdir));
4918 + dpri("deblk %u, nblk %lu, deblk %p, last{%lu, %p}, ver %lu\n",
4919 + vdir->vd_deblk_sz, vdir->vd_nblk, vdir->vd_deblk,
4920 + vdir->vd_last.ul, vdir->vd_last.p.deblk, vdir->vd_version);
4921 + for (ul = 0; ul < vdir->vd_nblk; ul++) {
4922 + p.deblk = vdir->vd_deblk[ul];
4924 + dpri("[%lu]: %p\n", ul, o);
4928 +static int do_pri_inode(aufs_bindex_t bindex, struct inode *inode,
4929 + struct dentry *wh)
4934 + if (!inode || IS_ERR(inode)) {
4935 + dpri("i%d: err %ld\n", bindex, PTR_ERR(inode));
4939 + /* the type of i_blocks depends upon CONFIG_LSF */
4940 + BUILD_BUG_ON(sizeof(inode->i_blocks) != sizeof(unsigned long)
4941 + && sizeof(inode->i_blocks) != sizeof(u64));
4943 + n = (void *)wh->d_name.name;
4944 + l = wh->d_name.len;
4947 + dpri("i%d: i%lu, %s, cnt %d, nl %u, 0%o, sz %llu, blk %llu,"
4948 + " ct %lld, np %lu, st 0x%lx, f 0x%x, g %x%s%.*s\n",
4950 + inode->i_ino, inode->i_sb ? au_sbtype(inode->i_sb) : "??",
4951 + atomic_read(&inode->i_count), inode->i_nlink, inode->i_mode,
4952 + i_size_read(inode), (unsigned long long)inode->i_blocks,
4953 + (long long)timespec_to_ns(&inode->i_ctime) & 0x0ffff,
4954 + inode->i_mapping ? inode->i_mapping->nrpages : 0,
4955 + inode->i_state, inode->i_flags, inode->i_generation,
4956 + l ? ", wh " : "", l, n);
4960 +void au_dpri_inode(struct inode *inode)
4962 + struct au_iinfo *iinfo;
4963 + aufs_bindex_t bindex;
4966 + err = do_pri_inode(-1, inode, NULL);
4967 + if (err || !au_test_aufs(inode->i_sb))
4970 + iinfo = au_ii(inode);
4973 + dpri("i-1: bstart %d, bend %d, gen %d\n",
4974 + iinfo->ii_bstart, iinfo->ii_bend, au_iigen(inode));
4975 + if (iinfo->ii_bstart < 0)
4977 + for (bindex = iinfo->ii_bstart; bindex <= iinfo->ii_bend; bindex++)
4978 + do_pri_inode(bindex, iinfo->ii_hinode[0 + bindex].hi_inode,
4979 + iinfo->ii_hinode[0 + bindex].hi_whdentry);
4982 +static int do_pri_dentry(aufs_bindex_t bindex, struct dentry *dentry)
4984 + struct dentry *wh = NULL;
4986 + if (!dentry || IS_ERR(dentry)) {
4987 + dpri("d%d: err %ld\n", bindex, PTR_ERR(dentry));
4990 + /* do not call dget_parent() here */
4991 + dpri("d%d: %.*s?/%.*s, %s, cnt %d, flags 0x%x\n",
4993 + AuDLNPair(dentry->d_parent), AuDLNPair(dentry),
4994 + dentry->d_sb ? au_sbtype(dentry->d_sb) : "??",
4995 + atomic_read(&dentry->d_count), dentry->d_flags);
4996 + if (bindex >= 0 && dentry->d_inode && au_test_aufs(dentry->d_sb)) {
4997 + struct au_iinfo *iinfo = au_ii(dentry->d_inode);
4999 + wh = iinfo->ii_hinode[0 + bindex].hi_whdentry;
5001 + do_pri_inode(bindex, dentry->d_inode, wh);
5005 +void au_dpri_dentry(struct dentry *dentry)
5007 + struct au_dinfo *dinfo;
5008 + aufs_bindex_t bindex;
5011 + err = do_pri_dentry(-1, dentry);
5012 + if (err || !au_test_aufs(dentry->d_sb))
5015 + dinfo = au_di(dentry);
5018 + dpri("d-1: bstart %d, bend %d, bwh %d, bdiropq %d, gen %d\n",
5019 + dinfo->di_bstart, dinfo->di_bend,
5020 + dinfo->di_bwh, dinfo->di_bdiropq, au_digen(dentry));
5021 + if (dinfo->di_bstart < 0)
5023 + for (bindex = dinfo->di_bstart; bindex <= dinfo->di_bend; bindex++)
5024 + do_pri_dentry(bindex, dinfo->di_hdentry[0 + bindex].hd_dentry);
5027 +static int do_pri_file(aufs_bindex_t bindex, struct file *file)
5031 + if (!file || IS_ERR(file)) {
5032 + dpri("f%d: err %ld\n", bindex, PTR_ERR(file));
5038 + && au_test_aufs(file->f_dentry->d_sb)
5040 + snprintf(a, sizeof(a), ", mmapped %d", au_test_mmapped(file));
5041 + dpri("f%d: mode 0x%x, flags 0%o, cnt %ld, pos %llu%s\n",
5042 + bindex, file->f_mode, file->f_flags, (long)file_count(file),
5044 + if (file->f_dentry)
5045 + do_pri_dentry(bindex, file->f_dentry);
5049 +void au_dpri_file(struct file *file)
5051 + struct au_finfo *finfo;
5052 + aufs_bindex_t bindex;
5055 + err = do_pri_file(-1, file);
5056 + if (err || !file->f_dentry || !au_test_aufs(file->f_dentry->d_sb))
5059 + finfo = au_fi(file);
5062 + if (finfo->fi_bstart < 0)
5064 + for (bindex = finfo->fi_bstart; bindex <= finfo->fi_bend; bindex++) {
5065 + struct au_hfile *hf;
5067 + hf = finfo->fi_hfile + bindex;
5068 + do_pri_file(bindex, hf ? hf->hf_file : NULL);
5072 +static int do_pri_br(aufs_bindex_t bindex, struct au_branch *br)
5074 + struct vfsmount *mnt;
5075 + struct super_block *sb;
5077 + if (!br || IS_ERR(br))
5080 + if (!mnt || IS_ERR(mnt))
5083 + if (!sb || IS_ERR(sb))
5086 + dpri("s%d: {perm 0x%x, cnt %d, wbr %p}, "
5087 + "%s, dev 0x%02x%02x, flags 0x%lx, cnt(BIAS) %d, active %d, "
5089 + bindex, br->br_perm, atomic_read(&br->br_count), br->br_wbr,
5090 + au_sbtype(sb), MAJOR(sb->s_dev), MINOR(sb->s_dev),
5091 + sb->s_flags, sb->s_count - S_BIAS,
5092 + atomic_read(&sb->s_active), !!br->br_xino.xi_file);
5096 + dpri("s%d: err %ld\n", bindex, PTR_ERR(br));
5100 +void au_dpri_sb(struct super_block *sb)
5102 + struct au_sbinfo *sbinfo;
5103 + aufs_bindex_t bindex;
5105 + /* to reuduce stack size */
5107 + struct vfsmount mnt;
5108 + struct au_branch fake;
5111 + /* this function can be called from magic sysrq */
5112 + a = kzalloc(sizeof(*a), GFP_ATOMIC);
5113 + if (unlikely(!a)) {
5114 + dpri("no memory\n");
5118 + a->mnt.mnt_sb = sb;
5119 + a->fake.br_perm = 0;
5120 + a->fake.br_mnt = &a->mnt;
5121 + a->fake.br_xino.xi_file = NULL;
5122 + atomic_set(&a->fake.br_count, 0);
5123 + smp_mb(); /* atomic_set */
5124 + err = do_pri_br(-1, &a->fake);
5126 + dpri("dev 0x%x\n", sb->s_dev);
5127 + if (err || !au_test_aufs(sb))
5130 + sbinfo = au_sbi(sb);
5133 + dpri("nw %d, gen %u, kobj %d\n",
5134 + atomic_read(&sbinfo->si_nowait.nw_len), sbinfo->si_generation,
5135 + atomic_read(&sbinfo->si_kobj.kref.refcount));
5136 + for (bindex = 0; bindex <= sbinfo->si_bend; bindex++)
5137 + do_pri_br(bindex, sbinfo->si_branch[0 + bindex]);
5140 +/* ---------------------------------------------------------------------- */
5142 +void au_dbg_sleep_jiffy(int jiffy)
5145 + jiffy = schedule_timeout_uninterruptible(jiffy);
5148 +void au_dbg_iattr(struct iattr *ia)
5150 +#define AuBit(name) if (ia->ia_valid & ATTR_ ## name) \
5170 + dpri("ia_file %p\n", ia->ia_file);
5173 +/* ---------------------------------------------------------------------- */
5175 +void au_dbg_verify_dir_parent(struct dentry *dentry, unsigned int sigen)
5177 + struct dentry *parent;
5179 + parent = dget_parent(dentry);
5180 + AuDebugOn(!S_ISDIR(dentry->d_inode->i_mode)
5181 + || IS_ROOT(dentry)
5182 + || au_digen(parent) != sigen);
5186 +void au_dbg_verify_nondir_parent(struct dentry *dentry, unsigned int sigen)
5188 + struct dentry *parent;
5190 + parent = dget_parent(dentry);
5191 + AuDebugOn(S_ISDIR(dentry->d_inode->i_mode)
5192 + || au_digen(parent) != sigen);
5196 +void au_dbg_verify_gen(struct dentry *parent, unsigned int sigen)
5199 + struct au_dcsub_pages dpages;
5200 + struct au_dpage *dpage;
5201 + struct dentry **dentries;
5203 + err = au_dpages_init(&dpages, GFP_NOFS);
5205 + err = au_dcsub_pages_rev(&dpages, parent, /*do_include*/1, NULL, NULL);
5207 + for (i = dpages.ndpage - 1; !err && i >= 0; i--) {
5208 + dpage = dpages.dpages + i;
5209 + dentries = dpage->dentries;
5210 + for (j = dpage->ndentry - 1; !err && j >= 0; j--)
5211 + AuDebugOn(au_digen(dentries[j]) != sigen);
5213 + au_dpages_free(&dpages);
5216 +void au_dbg_verify_hf(struct au_finfo *finfo)
5218 + struct au_hfile *hf;
5219 + aufs_bindex_t bend, bindex;
5221 + if (finfo->fi_bstart >= 0) {
5222 + bend = finfo->fi_bend;
5223 + for (bindex = finfo->fi_bstart; bindex <= bend; bindex++) {
5224 + hf = finfo->fi_hfile + bindex;
5225 + AuDebugOn(hf->hf_file || hf->hf_br);
5230 +void au_dbg_verify_kthread(void)
5232 + if (au_test_wkq(current)) {
5238 +/* ---------------------------------------------------------------------- */
5240 +void au_debug_sbinfo_init(struct au_sbinfo *sbinfo __maybe_unused)
5242 +#ifdef AuForceNoPlink
5243 + au_opt_clr(sbinfo->si_mntflags, PLINK);
5245 +#ifdef AuForceNoXino
5246 + au_opt_clr(sbinfo->si_mntflags, XINO);
5248 +#ifdef AuForceNoRefrof
5249 + au_opt_clr(sbinfo->si_mntflags, REFROF);
5251 +#ifdef AuForceHinotify
5252 + au_opt_set_udba(sbinfo->si_mntflags, UDBA_HINOTIFY);
5255 + sbinfo->si_rdblk = 0;
5256 + sbinfo->si_rdhash = 0;
5260 +int __init au_debug_init(void)
5262 + aufs_bindex_t bindex;
5263 + struct au_vdir_destr destr;
5266 + AuDebugOn(bindex >= 0);
5269 + AuDebugOn(destr.len < NAME_MAX);
5271 +#ifdef CONFIG_4KSTACKS
5272 + AuWarn("CONFIG_4KSTACKS is defined.\n");
5275 +#ifdef AuForceNoBrs
5281 diff --git a/fs/aufs/debug.h b/fs/aufs/debug.h
5282 new file mode 100644
5283 index 0000000..dbcbf31
5285 +++ b/fs/aufs/debug.h
5288 + * Copyright (C) 2005-2009 Junjiro R. Okajima
5290 + * This program, aufs is free software; you can redistribute it and/or modify
5291 + * it under the terms of the GNU General Public License as published by
5292 + * the Free Software Foundation; either version 2 of the License, or
5293 + * (at your option) any later version.
5295 + * This program is distributed in the hope that it will be useful,
5296 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
5297 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
5298 + * GNU General Public License for more details.
5300 + * You should have received a copy of the GNU General Public License
5301 + * along with this program; if not, write to the Free Software
5302 + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
5306 + * debug print functions
5309 +#ifndef __AUFS_DEBUG_H__
5310 +#define __AUFS_DEBUG_H__
5314 +#include <linux/bug.h>
5315 +/* #include <linux/err.h> */
5316 +/* #include <linux/init.h> */
5317 +/* #include <linux/kernel.h> */
5318 +#include <linux/delay.h>
5319 +/* #include <linux/kd.h> */
5320 +/* #include <linux/vt_kern.h> */
5321 +#include <linux/sysrq.h>
5322 +#include <linux/aufs_type.h>
5324 +#ifdef CONFIG_AUFS_DEBUG
5325 +#define AuDebugOn(a) BUG_ON(a)
5327 +/* module parameter */
5328 +extern int aufs_debug;
5329 +static inline void au_debug(int n)
5335 +static inline int au_debug_test(void)
5337 + return aufs_debug;
5340 +#define AuDebugOn(a) do {} while (0)
5341 +AuStubVoid(au_debug, int n)
5342 +AuStubInt0(au_debug_test, void)
5343 +#endif /* CONFIG_AUFS_DEBUG */
5345 +/* ---------------------------------------------------------------------- */
5349 +#define AuDpri(lvl, fmt, ...) \
5350 + printk(lvl AUFS_NAME " %s:%d:%s[%d]: " fmt, \
5351 + __func__, __LINE__, current->comm, current->pid, ##__VA_ARGS__)
5352 +#define AuDbg(fmt, ...) do { \
5353 + if (au_debug_test()) \
5354 + AuDpri(KERN_DEBUG, "DEBUG: " fmt, ##__VA_ARGS__); \
5356 +#define AuLabel(l) AuDbg(#l "\n")
5357 +#define AuInfo(fmt, ...) AuDpri(KERN_INFO, fmt, ##__VA_ARGS__)
5358 +#define AuWarn(fmt, ...) AuDpri(KERN_WARNING, fmt, ##__VA_ARGS__)
5359 +#define AuErr(fmt, ...) AuDpri(KERN_ERR, fmt, ##__VA_ARGS__)
5360 +#define AuIOErr(fmt, ...) AuErr("I/O Error, " fmt, ##__VA_ARGS__)
5361 +#define AuWarn1(fmt, ...) do { \
5362 + static unsigned char _c; \
5364 + AuWarn(fmt, ##__VA_ARGS__); \
5367 +#define AuErr1(fmt, ...) do { \
5368 + static unsigned char _c; \
5370 + AuErr(fmt, ##__VA_ARGS__); \
5373 +#define AuIOErr1(fmt, ...) do { \
5374 + static unsigned char _c; \
5376 + AuIOErr(fmt, ##__VA_ARGS__); \
5379 +#define AuUnsupportMsg "This operation is not supported." \
5380 + " Please report this application to aufs-users ML."
5381 +#define AuUnsupport(fmt, ...) do { \
5382 + AuErr(AuUnsupportMsg "\n" fmt, ##__VA_ARGS__); \
5386 +#define AuTraceErr(e) do { \
5387 + if (unlikely((e) < 0)) \
5388 + AuDbg("err %d\n", (int)(e)); \
5391 +#define AuTraceErrPtr(p) do { \
5393 + AuDbg("err %ld\n", PTR_ERR(p)); \
5396 +/* dirty macros for debug print, use with "%.*s" and caution */
5397 +#define AuLNPair(qstr) (qstr)->len, (qstr)->name
5398 +#define AuDLNPair(d) AuLNPair(&(d)->d_name)
5400 +/* ---------------------------------------------------------------------- */
5405 +#ifdef CONFIG_AUFS_DEBUG
5406 +extern char *au_plevel;
5408 +void au_dpri_whlist(struct au_nhash *whlist);
5410 +void au_dpri_vdir(struct au_vdir *vdir);
5412 +void au_dpri_inode(struct inode *inode);
5413 +void au_dpri_dentry(struct dentry *dentry);
5415 +void au_dpri_file(struct file *filp);
5416 +struct super_block;
5417 +void au_dpri_sb(struct super_block *sb);
5419 +void au_dbg_sleep_jiffy(int jiffy);
5421 +void au_dbg_iattr(struct iattr *ia);
5423 +void au_dbg_verify_dir_parent(struct dentry *dentry, unsigned int sigen);
5424 +void au_dbg_verify_nondir_parent(struct dentry *dentry, unsigned int sigen);
5425 +void au_dbg_verify_gen(struct dentry *parent, unsigned int sigen);
5426 +void au_dbg_verify_hf(struct au_finfo *finfo);
5427 +void au_dbg_verify_kthread(void);
5429 +int __init au_debug_init(void);
5430 +void au_debug_sbinfo_init(struct au_sbinfo *sbinfo);
5431 +#define AuDbgWhlist(w) do { \
5433 + au_dpri_whlist(w); \
5436 +#define AuDbgVdir(v) do { \
5438 + au_dpri_vdir(v); \
5441 +#define AuDbgInode(i) do { \
5443 + au_dpri_inode(i); \
5446 +#define AuDbgDentry(d) do { \
5448 + au_dpri_dentry(d); \
5451 +#define AuDbgFile(f) do { \
5453 + au_dpri_file(f); \
5456 +#define AuDbgSb(sb) do { \
5457 + AuDbg(#sb "\n"); \
5461 +#define AuDbgSleep(sec) do { \
5462 + AuDbg("sleep %d sec\n", sec); \
5466 +#define AuDbgSleepJiffy(jiffy) do { \
5467 + AuDbg("sleep %d jiffies\n", jiffy); \
5468 + au_dbg_sleep_jiffy(jiffy); \
5471 +#define AuDbgIAttr(ia) do { \
5472 + AuDbg("ia_valid 0x%x\n", (ia)->ia_valid); \
5473 + au_dbg_iattr(ia); \
5476 +AuStubVoid(au_dbg_verify_dir_parent, struct dentry *dentry, unsigned int sigen)
5477 +AuStubVoid(au_dbg_verify_nondir_parent, struct dentry *dentry,
5478 + unsigned int sigen)
5479 +AuStubVoid(au_dbg_verify_gen, struct dentry *parent, unsigned int sigen)
5480 +AuStubVoid(au_dbg_verify_hf, struct au_finfo *finfo)
5481 +AuStubVoid(au_dbg_verify_kthread, void)
5482 +AuStubInt0(__init au_debug_init, void)
5483 +AuStubVoid(au_debug_sbinfo_init, struct au_sbinfo *sbinfo)
5485 +#define AuDbgWhlist(w) do {} while (0)
5486 +#define AuDbgVdir(v) do {} while (0)
5487 +#define AuDbgInode(i) do {} while (0)
5488 +#define AuDbgDentry(d) do {} while (0)
5489 +#define AuDbgFile(f) do {} while (0)
5490 +#define AuDbgSb(sb) do {} while (0)
5491 +#define AuDbgSleep(sec) do {} while (0)
5492 +#define AuDbgSleepJiffy(jiffy) do {} while (0)
5493 +#define AuDbgIAttr(ia) do {} while (0)
5494 +#endif /* CONFIG_AUFS_DEBUG */
5496 +/* ---------------------------------------------------------------------- */
5498 +#ifdef CONFIG_AUFS_MAGIC_SYSRQ
5499 +int __init au_sysrq_init(void);
5500 +void au_sysrq_fin(void);
5502 +#ifdef CONFIG_HW_CONSOLE
5503 +#define au_dbg_blocked() do { \
5505 + handle_sysrq('w', vc_cons[fg_console].d->vc_tty); \
5508 +AuStubVoid(au_dbg_blocked, void)
5512 +AuStubInt0(__init au_sysrq_init, void)
5513 +AuStubVoid(au_sysrq_fin, void)
5514 +AuStubVoid(au_dbg_blocked, void)
5515 +#endif /* CONFIG_AUFS_MAGIC_SYSRQ */
5517 +#endif /* __KERNEL__ */
5518 +#endif /* __AUFS_DEBUG_H__ */
5519 diff --git a/fs/aufs/dentry.c b/fs/aufs/dentry.c
5520 new file mode 100644
5521 index 0000000..2b18f3c
5523 +++ b/fs/aufs/dentry.c
5526 + * Copyright (C) 2005-2009 Junjiro R. Okajima
5528 + * This program, aufs is free software; you can redistribute it and/or modify
5529 + * it under the terms of the GNU General Public License as published by
5530 + * the Free Software Foundation; either version 2 of the License, or
5531 + * (at your option) any later version.
5533 + * This program is distributed in the hope that it will be useful,
5534 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
5535 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
5536 + * GNU General Public License for more details.
5538 + * You should have received a copy of the GNU General Public License
5539 + * along with this program; if not, write to the Free Software
5540 + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
5544 + * lookup and dentry operations
5547 +#include <linux/namei.h>
5550 +static void au_h_nd(struct nameidata *h_nd, struct nameidata *nd)
5556 + * gave up supporting LOOKUP_CREATE/OPEN for lower fs,
5557 + * due to whiteout and branch permission.
5559 + h_nd->flags &= ~(/*LOOKUP_PARENT |*/ LOOKUP_OPEN | LOOKUP_CREATE
5561 + /* unnecessary? */
5562 + h_nd->intent.open.file = NULL;
5564 + memset(h_nd, 0, sizeof(*h_nd));
5567 +struct au_lkup_one_args {
5568 + struct dentry **errp;
5569 + struct qstr *name;
5570 + struct dentry *h_parent;
5571 + struct au_branch *br;
5572 + struct nameidata *nd;
5575 +struct dentry *au_lkup_one(struct qstr *name, struct dentry *h_parent,
5576 + struct au_branch *br, struct nameidata *nd)
5578 + struct dentry *h_dentry;
5580 + struct nameidata h_nd;
5582 + if (au_test_fs_null_nd(h_parent->d_sb))
5583 + return vfsub_lookup_one_len(name->name, h_parent, name->len);
5585 + au_h_nd(&h_nd, nd);
5586 + h_nd.path.dentry = h_parent;
5587 + h_nd.path.mnt = br->br_mnt;
5589 + err = __lookup_one_len(name->name, &h_nd.last, NULL, name->len);
5590 + h_dentry = ERR_PTR(err);
5592 + path_get(&h_nd.path);
5593 + h_dentry = vfsub_lookup_hash(&h_nd);
5594 + path_put(&h_nd.path);
5597 + AuTraceErrPtr(h_dentry);
5601 +static void au_call_lkup_one(void *args)
5603 + struct au_lkup_one_args *a = args;
5604 + *a->errp = au_lkup_one(a->name, a->h_parent, a->br, a->nd);
5607 +#define AuLkup_ALLOW_NEG 1
5608 +#define au_ftest_lkup(flags, name) ((flags) & AuLkup_##name)
5609 +#define au_fset_lkup(flags, name) { (flags) |= AuLkup_##name; }
5610 +#define au_fclr_lkup(flags, name) { (flags) &= ~AuLkup_##name; }
5612 +struct au_do_lookup_args {
5613 + unsigned int flags;
5615 + struct nameidata *nd;
5619 + * returns positive/negative dentry, NULL or an error.
5620 + * NULL means whiteout-ed or not-found.
5622 +static struct dentry*
5623 +au_do_lookup(struct dentry *h_parent, struct dentry *dentry,
5624 + aufs_bindex_t bindex, struct qstr *wh_name,
5625 + struct au_do_lookup_args *args)
5627 + struct dentry *h_dentry;
5628 + struct inode *h_inode, *inode;
5629 + struct qstr *name;
5630 + struct au_branch *br;
5631 + int wh_found, opq;
5632 + unsigned char wh_able;
5633 + const unsigned char allow_neg = !!au_ftest_lkup(args->flags, ALLOW_NEG);
5635 + name = &dentry->d_name;
5637 + br = au_sbr(dentry->d_sb, bindex);
5638 + wh_able = !!au_br_whable(br->br_perm);
5640 + wh_found = au_wh_test(h_parent, wh_name, br, /*try_sio*/0);
5641 + h_dentry = ERR_PTR(wh_found);
5644 + if (unlikely(wh_found < 0))
5647 + /* We found a whiteout */
5648 + /* au_set_dbend(dentry, bindex); */
5649 + au_set_dbwh(dentry, bindex);
5651 + return NULL; /* success */
5654 + h_dentry = au_lkup_one(name, h_parent, br, args->nd);
5655 + if (IS_ERR(h_dentry))
5658 + h_inode = h_dentry->d_inode;
5662 + } else if (wh_found
5663 + || (args->type && args->type != (h_inode->i_mode & S_IFMT)))
5666 + if (au_dbend(dentry) <= bindex)
5667 + au_set_dbend(dentry, bindex);
5668 + if (au_dbstart(dentry) < 0 || bindex < au_dbstart(dentry))
5669 + au_set_dbstart(dentry, bindex);
5670 + au_set_h_dptr(dentry, bindex, h_dentry);
5672 + inode = dentry->d_inode;
5673 + if (!h_inode || !S_ISDIR(h_inode->i_mode) || !wh_able
5674 + || (inode && !S_ISDIR(inode->i_mode)))
5675 + goto out; /* success */
5677 + mutex_lock_nested(&h_inode->i_mutex, AuLsc_I_CHILD);
5678 + opq = au_diropq_test(h_dentry, br);
5679 + mutex_unlock(&h_inode->i_mutex);
5681 + au_set_dbdiropq(dentry, bindex);
5682 + else if (unlikely(opq < 0)) {
5683 + au_set_h_dptr(dentry, bindex, NULL);
5684 + h_dentry = ERR_PTR(opq);
5695 +static int au_test_shwh(struct super_block *sb, const struct qstr *name)
5697 + if (unlikely(!au_opt_test(au_mntflags(sb), SHWH)
5698 + && !strncmp(name->name, AUFS_WH_PFX, AUFS_WH_PFX_LEN)))
5704 + * returns the number of lower positive dentries,
5705 + * otherwise an error.
5706 + * can be called at unlinking with @type is zero.
5708 +int au_lkup_dentry(struct dentry *dentry, aufs_bindex_t bstart, mode_t type,
5709 + struct nameidata *nd)
5711 + int npositive, err;
5712 + aufs_bindex_t bindex, btail, bdiropq;
5713 + unsigned char isdir;
5714 + struct qstr whname;
5715 + struct au_do_lookup_args args = {
5720 + const struct qstr *name = &dentry->d_name;
5721 + struct dentry *parent;
5722 + struct inode *inode;
5724 + parent = dget_parent(dentry);
5725 + err = au_test_shwh(dentry->d_sb, name);
5726 + if (unlikely(err))
5729 + err = au_wh_name_alloc(&whname, name);
5730 + if (unlikely(err))
5733 + inode = dentry->d_inode;
5734 + isdir = !!(inode && S_ISDIR(inode->i_mode));
5736 + au_fset_lkup(args.flags, ALLOW_NEG);
5739 + btail = au_dbtaildir(parent);
5740 + for (bindex = bstart; bindex <= btail; bindex++) {
5741 + struct dentry *h_parent, *h_dentry;
5742 + struct inode *h_inode, *h_dir;
5744 + h_dentry = au_h_dptr(dentry, bindex);
5746 + if (h_dentry->d_inode)
5748 + if (type != S_IFDIR)
5752 + h_parent = au_h_dptr(parent, bindex);
5755 + h_dir = h_parent->d_inode;
5756 + if (!h_dir || !S_ISDIR(h_dir->i_mode))
5759 + mutex_lock_nested(&h_dir->i_mutex, AuLsc_I_PARENT);
5760 + h_dentry = au_do_lookup(h_parent, dentry, bindex, &whname,
5762 + mutex_unlock(&h_dir->i_mutex);
5763 + err = PTR_ERR(h_dentry);
5764 + if (IS_ERR(h_dentry))
5766 + au_fclr_lkup(args.flags, ALLOW_NEG);
5768 + if (au_dbwh(dentry) >= 0)
5772 + h_inode = h_dentry->d_inode;
5777 + args.type = h_inode->i_mode & S_IFMT;
5778 + if (args.type != S_IFDIR)
5781 + /* the type of lower may be different */
5782 + bdiropq = au_dbdiropq(dentry);
5783 + if (bdiropq >= 0 && bdiropq <= bindex)
5789 + AuLabel(positive);
5790 + au_update_dbstart(dentry);
5793 + if (unlikely(!au_opt_test(au_mntflags(dentry->d_sb), UDBA_NONE)
5794 + && au_dbstart(dentry) < 0))
5795 + /* both of real entry and whiteout found */
5799 + kfree(whname.name);
5805 +struct dentry *au_sio_lkup_one(struct qstr *name, struct dentry *parent,
5806 + struct au_branch *br)
5808 + struct dentry *dentry;
5811 + if (!au_test_h_perm_sio(parent->d_inode, MAY_EXEC))
5812 + dentry = au_lkup_one(name, parent, br, /*nd*/NULL);
5814 + struct au_lkup_one_args args = {
5817 + .h_parent = parent,
5822 + wkq_err = au_wkq_wait(au_call_lkup_one, &args);
5823 + if (unlikely(wkq_err))
5824 + dentry = ERR_PTR(wkq_err);
5831 + * lookup @dentry on @bindex which should be negative.
5833 +int au_lkup_neg(struct dentry *dentry, aufs_bindex_t bindex)
5836 + struct dentry *parent, *h_parent, *h_dentry;
5837 + struct qstr *name;
5839 + name = &dentry->d_name;
5840 + parent = dget_parent(dentry);
5841 + h_parent = au_h_dptr(parent, bindex);
5842 + h_dentry = au_sio_lkup_one(name, h_parent,
5843 + au_sbr(dentry->d_sb, bindex));
5844 + err = PTR_ERR(h_dentry);
5845 + if (IS_ERR(h_dentry))
5847 + if (unlikely(h_dentry->d_inode)) {
5849 + AuIOErr("b%d %.*s should be negative.\n",
5850 + bindex, AuDLNPair(h_dentry));
5855 + if (bindex < au_dbstart(dentry))
5856 + au_set_dbstart(dentry, bindex);
5857 + if (au_dbend(dentry) < bindex)
5858 + au_set_dbend(dentry, bindex);
5859 + au_set_h_dptr(dentry, bindex, h_dentry);
5867 +/* ---------------------------------------------------------------------- */
5869 +/* subset of struct inode */
5871 + unsigned long i_ino;
5872 + /* unsigned int i_nlink; */
5878 + blkcnt_t i_blocks;
5883 +static void au_iattr_save(struct au_iattr *ia, struct inode *h_inode)
5885 + ia->i_ino = h_inode->i_ino;
5886 + /* ia->i_nlink = h_inode->i_nlink; */
5887 + ia->i_uid = h_inode->i_uid;
5888 + ia->i_gid = h_inode->i_gid;
5889 + ia->i_version = h_inode->i_version;
5891 + ia->i_size = h_inode->i_size;
5892 + ia->i_blocks = h_inode->i_blocks;
5894 + ia->i_mode = (h_inode->i_mode & S_IFMT);
5897 +static int au_iattr_test(struct au_iattr *ia, struct inode *h_inode)
5899 + return ia->i_ino != h_inode->i_ino
5900 + /* || ia->i_nlink != h_inode->i_nlink */
5901 + || ia->i_uid != h_inode->i_uid
5902 + || ia->i_gid != h_inode->i_gid
5903 + || ia->i_version != h_inode->i_version
5905 + || ia->i_size != h_inode->i_size
5906 + || ia->i_blocks != h_inode->i_blocks
5908 + || ia->i_mode != (h_inode->i_mode & S_IFMT);
5911 +static int au_h_verify_dentry(struct dentry *h_dentry, struct dentry *h_parent,
5912 + struct au_branch *br)
5915 + struct au_iattr ia;
5916 + struct inode *h_inode;
5917 + struct dentry *h_d;
5919 + memset(&ia, -1, sizeof(ia));
5920 + h_inode = h_dentry->d_inode;
5922 + au_iattr_save(&ia, h_inode);
5924 + /* main purpose is namei.c:cached_lookup() and d_revalidate */
5925 + h_d = au_lkup_one(&h_dentry->d_name, h_parent, br, /*nd*/NULL);
5926 + err = PTR_ERR(h_d);
5930 + /* fuse d_revalidate always return 0 for negative dentries */
5932 + if (unlikely((h_d != h_dentry
5933 + || h_d->d_inode != h_inode
5934 + || (h_inode && au_iattr_test(&ia, h_inode)))
5935 + && !au_test_fuse(h_parent->d_sb)))
5936 + err = au_busy_or_stale();
5943 +int au_h_verify(struct dentry *h_dentry, unsigned int udba, struct inode *h_dir,
5944 + struct dentry *h_parent, struct au_branch *br)
5949 + if (udba == AuOpt_UDBA_REVAL) {
5951 + err = (h_dentry->d_parent->d_inode != h_dir);
5952 + } else if (udba == AuOpt_UDBA_HINOTIFY)
5953 + err = au_h_verify_dentry(h_dentry, h_parent, br);
5958 +/* ---------------------------------------------------------------------- */
5960 +static void au_do_refresh_hdentry(struct au_hdentry *p, struct au_dinfo *dinfo,
5961 + struct dentry *parent)
5963 + struct dentry *h_d, *h_dp;
5964 + struct au_hdentry tmp, *q;
5965 + struct super_block *sb;
5966 + aufs_bindex_t new_bindex, bindex, bend, bwh, bdiropq;
5968 + AuRwMustWriteLock(&dinfo->di_rwsem);
5970 + bend = dinfo->di_bend;
5971 + bwh = dinfo->di_bwh;
5972 + bdiropq = dinfo->di_bdiropq;
5973 + for (bindex = dinfo->di_bstart; bindex <= bend; bindex++, p++) {
5974 + h_d = p->hd_dentry;
5978 + h_dp = dget_parent(h_d);
5979 + if (h_dp == au_h_dptr(parent, bindex)) {
5984 + new_bindex = au_find_dbindex(parent, h_dp);
5986 + if (dinfo->di_bwh == bindex)
5988 + if (dinfo->di_bdiropq == bindex)
5989 + bdiropq = new_bindex;
5990 + if (new_bindex < 0) {
5992 + p->hd_dentry = NULL;
5996 + /* swap two lower dentries, and loop again */
5997 + q = dinfo->di_hdentry + new_bindex;
6001 + if (tmp.hd_dentry) {
6007 + sb = parent->d_sb;
6008 + dinfo->di_bwh = -1;
6009 + if (bwh >= 0 && bwh <= au_sbend(sb) && au_sbr_whable(sb, bwh))
6010 + dinfo->di_bwh = bwh;
6012 + dinfo->di_bdiropq = -1;
6014 + && bdiropq <= au_sbend(sb)
6015 + && au_sbr_whable(sb, bdiropq))
6016 + dinfo->di_bdiropq = bdiropq;
6018 + bend = au_dbend(parent);
6019 + p = dinfo->di_hdentry;
6020 + for (bindex = 0; bindex <= bend; bindex++, p++)
6021 + if (p->hd_dentry) {
6022 + dinfo->di_bstart = bindex;
6026 + p = dinfo->di_hdentry + bend;
6027 + for (bindex = bend; bindex >= 0; bindex--, p--)
6028 + if (p->hd_dentry) {
6029 + dinfo->di_bend = bindex;
6035 + * returns the number of found lower positive dentries,
6036 + * otherwise an error.
6038 +int au_refresh_hdentry(struct dentry *dentry, mode_t type)
6040 + int npositive, err;
6041 + unsigned int sigen;
6042 + aufs_bindex_t bstart;
6043 + struct au_dinfo *dinfo;
6044 + struct super_block *sb;
6045 + struct dentry *parent;
6047 + DiMustWriteLock(dentry);
6049 + sb = dentry->d_sb;
6050 + AuDebugOn(IS_ROOT(dentry));
6051 + sigen = au_sigen(sb);
6052 + parent = dget_parent(dentry);
6053 + AuDebugOn(au_digen(parent) != sigen
6054 + || au_iigen(parent->d_inode) != sigen);
6056 + dinfo = au_di(dentry);
6057 + err = au_di_realloc(dinfo, au_sbend(sb) + 1);
6059 + if (unlikely(err))
6061 + au_do_refresh_hdentry(dinfo->di_hdentry + dinfo->di_bstart, dinfo,
6065 + bstart = au_dbstart(parent);
6066 + if (type != S_IFDIR && dinfo->di_bstart == bstart)
6067 + goto out_dgen; /* success */
6069 + npositive = au_lkup_dentry(dentry, bstart, type, /*nd*/NULL);
6070 + if (npositive < 0)
6072 + if (dinfo->di_bwh >= 0 && dinfo->di_bwh <= dinfo->di_bstart)
6076 + au_update_digen(dentry);
6079 + AuTraceErr(npositive);
6083 +static noinline_for_stack
6084 +int au_do_h_d_reval(struct dentry *h_dentry, struct nameidata *nd,
6085 + struct dentry *dentry, aufs_bindex_t bindex)
6088 + int (*reval)(struct dentry *, struct nameidata *);
6092 + if (h_dentry->d_op)
6093 + reval = h_dentry->d_op->d_revalidate;
6097 + AuDbg("b%d\n", bindex);
6098 + if (au_test_fs_null_nd(h_dentry->d_sb))
6099 + /* it may return tri-state */
6100 + valid = reval(h_dentry, NULL);
6102 + struct nameidata h_nd;
6104 + struct dentry *parent;
6106 + au_h_nd(&h_nd, nd);
6107 + parent = nd->path.dentry;
6108 + locked = (nd && nd->path.dentry != dentry);
6110 + di_read_lock_parent(parent, AuLock_IR);
6111 + BUG_ON(bindex > au_dbend(parent));
6112 + h_nd.path.dentry = au_h_dptr(parent, bindex);
6113 + BUG_ON(!h_nd.path.dentry);
6114 + h_nd.path.mnt = au_sbr(parent->d_sb, bindex)->br_mnt;
6115 + path_get(&h_nd.path);
6116 + valid = reval(h_dentry, &h_nd);
6117 + path_put(&h_nd.path);
6119 + di_read_unlock(parent, AuLock_IR);
6122 + if (unlikely(valid < 0))
6132 +/* todo: remove this */
6133 +static int h_d_revalidate(struct dentry *dentry, struct inode *inode,
6134 + struct nameidata *nd, int do_udba)
6137 + umode_t mode, h_mode;
6138 + aufs_bindex_t bindex, btail, bstart, ibs, ibe;
6139 + unsigned char plus, unhashed, is_root, h_plus;
6140 + struct inode *first, *h_inode, *h_cached_inode;
6141 + struct dentry *h_dentry;
6142 + struct qstr *name, *h_name;
6150 + unhashed = !!d_unhashed(dentry);
6151 + is_root = !!IS_ROOT(dentry);
6152 + name = &dentry->d_name;
6155 + * Theoretically, REVAL test should be unnecessary in case of INOTIFY.
6156 + * But inotify doesn't fire some necessary events,
6157 + * IN_ATTRIB for atime/nlink/pageio
6158 + * IN_DELETE for NFS dentry
6159 + * Let's do REVAL test too.
6161 + if (do_udba && inode) {
6162 + mode = (inode->i_mode & S_IFMT);
6163 + plus = (inode->i_nlink > 0);
6164 + first = au_h_iptr(inode, au_ibstart(inode));
6165 + ibs = au_ibstart(inode);
6166 + ibe = au_ibend(inode);
6169 + bstart = au_dbstart(dentry);
6171 + if (inode && S_ISDIR(inode->i_mode))
6172 + btail = au_dbtaildir(dentry);
6173 + for (bindex = bstart; bindex <= btail; bindex++) {
6174 + h_dentry = au_h_dptr(dentry, bindex);
6178 + AuDbg("b%d, %.*s\n", bindex, AuDLNPair(h_dentry));
6179 + h_name = &h_dentry->d_name;
6180 + if (unlikely(do_udba
6182 + && (unhashed != !!d_unhashed(h_dentry)
6183 + || name->len != h_name->len
6184 + || memcmp(name->name, h_name->name, name->len))
6186 + AuDbg("unhash 0x%x 0x%x, %.*s %.*s\n",
6187 + unhashed, d_unhashed(h_dentry),
6188 + AuDLNPair(dentry), AuDLNPair(h_dentry));
6192 + err = au_do_h_d_reval(h_dentry, nd, dentry, bindex);
6193 + if (unlikely(err))
6194 + /* do not goto err, to keep the errno */
6197 + /* todo: plink too? */
6202 + h_inode = h_dentry->d_inode;
6203 + if (unlikely(!!inode != !!h_inode))
6208 + h_cached_inode = h_inode;
6210 + h_mode = (h_inode->i_mode & S_IFMT);
6211 + h_plus = (h_inode->i_nlink > 0);
6213 + if (inode && ibs <= bindex && bindex <= ibe)
6214 + h_cached_inode = au_h_iptr(inode, bindex);
6216 + if (unlikely(plus != h_plus
6218 + || h_cached_inode != h_inode))
6230 +static int simple_reval_dpath(struct dentry *dentry, unsigned int sigen)
6233 + struct dentry *parent;
6234 + struct inode *inode;
6236 + inode = dentry->d_inode;
6237 + if (au_digen(dentry) == sigen && au_iigen(inode) == sigen)
6240 + parent = dget_parent(dentry);
6241 + di_read_lock_parent(parent, AuLock_IR);
6242 + AuDebugOn(au_digen(parent) != sigen
6243 + || au_iigen(parent->d_inode) != sigen);
6244 + au_dbg_verify_gen(parent, sigen);
6246 + /* returns a number of positive dentries */
6247 + err = au_refresh_hdentry(dentry, inode->i_mode & S_IFMT);
6249 + err = au_refresh_hinode(inode, dentry);
6251 + di_read_unlock(parent, AuLock_IR);
6256 +int au_reval_dpath(struct dentry *dentry, unsigned int sigen)
6259 + struct dentry *d, *parent;
6260 + struct inode *inode;
6262 + if (!au_ftest_si(au_sbi(dentry->d_sb), FAILED_REFRESH_DIRS))
6263 + return simple_reval_dpath(dentry, sigen);
6265 + /* slow loop, keep it simple and stupid */
6266 + /* cf: au_cpup_dirs() */
6269 + while (au_digen(dentry) != sigen
6270 + || au_iigen(dentry->d_inode) != sigen) {
6274 + parent = dget_parent(d);
6275 + if (au_digen(parent) == sigen
6276 + && au_iigen(parent->d_inode) == sigen)
6281 + inode = d->d_inode;
6283 + di_write_lock_child(d);
6285 + /* someone might update our dentry while we were sleeping */
6286 + if (au_digen(d) != sigen || au_iigen(d->d_inode) != sigen) {
6287 + di_read_lock_parent(parent, AuLock_IR);
6288 + /* returns a number of positive dentries */
6289 + err = au_refresh_hdentry(d, inode->i_mode & S_IFMT);
6291 + err = au_refresh_hinode(inode, d);
6292 + di_read_unlock(parent, AuLock_IR);
6296 + di_write_unlock(d);
6298 + if (unlikely(err))
6306 + * if valid returns 1, otherwise 0.
6308 +static int aufs_d_revalidate(struct dentry *dentry, struct nameidata *nd)
6311 + unsigned int sigen;
6312 + unsigned char do_udba;
6313 + struct super_block *sb;
6314 + struct inode *inode;
6317 + sb = dentry->d_sb;
6318 + inode = dentry->d_inode;
6319 + aufs_read_lock(dentry, AuLock_FLUSH | AuLock_DW);
6320 + sigen = au_sigen(sb);
6321 + if (au_digen(dentry) != sigen) {
6322 + AuDebugOn(IS_ROOT(dentry));
6324 + err = au_reval_dpath(dentry, sigen);
6325 + if (unlikely(err))
6327 + AuDebugOn(au_digen(dentry) != sigen);
6329 + if (inode && au_iigen(inode) != sigen) {
6330 + AuDebugOn(IS_ROOT(dentry));
6331 + err = au_refresh_hinode(inode, dentry);
6332 + if (unlikely(err))
6334 + AuDebugOn(au_iigen(inode) != sigen);
6336 + di_downgrade_lock(dentry, AuLock_IR);
6338 + AuDebugOn(au_digen(dentry) != sigen);
6339 + AuDebugOn(inode && au_iigen(inode) != sigen);
6341 + do_udba = !au_opt_test(au_mntflags(sb), UDBA_NONE);
6342 + if (do_udba && inode) {
6343 + aufs_bindex_t bstart = au_ibstart(inode);
6346 + && au_test_higen(inode, au_h_iptr(inode, bstart)))
6350 + err = h_d_revalidate(dentry, inode, nd, do_udba);
6351 + if (unlikely(!err && do_udba && au_dbstart(dentry) < 0))
6352 + /* both of real entry and whiteout found */
6357 + di_downgrade_lock(dentry, AuLock_IR);
6359 + au_store_oflag(nd, inode);
6360 + aufs_read_unlock(dentry, AuLock_IR);
6364 + AuDbg("%.*s invalid\n", AuDLNPair(dentry));
6368 +static void aufs_d_release(struct dentry *dentry)
6370 + struct au_dinfo *dinfo;
6371 + aufs_bindex_t bend, bindex;
6373 + dinfo = dentry->d_fsdata;
6377 + /* dentry may not be revalidated */
6378 + bindex = dinfo->di_bstart;
6379 + if (bindex >= 0) {
6380 + struct au_hdentry *p;
6382 + bend = dinfo->di_bend;
6383 + p = dinfo->di_hdentry + bindex;
6384 + while (bindex++ <= bend) {
6390 + kfree(dinfo->di_hdentry);
6391 + AuRwDestroy(&dinfo->di_rwsem);
6392 + au_cache_free_dinfo(dinfo);
6393 + au_hin_di_reinit(dentry);
6396 +struct dentry_operations aufs_dop = {
6397 + .d_revalidate = aufs_d_revalidate,
6398 + .d_release = aufs_d_release
6400 diff --git a/fs/aufs/dentry.h b/fs/aufs/dentry.h
6401 new file mode 100644
6402 index 0000000..893288c
6404 +++ b/fs/aufs/dentry.h
6407 + * Copyright (C) 2005-2009 Junjiro R. Okajima
6409 + * This program, aufs is free software; you can redistribute it and/or modify
6410 + * it under the terms of the GNU General Public License as published by
6411 + * the Free Software Foundation; either version 2 of the License, or
6412 + * (at your option) any later version.
6414 + * This program is distributed in the hope that it will be useful,
6415 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
6416 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
6417 + * GNU General Public License for more details.
6419 + * You should have received a copy of the GNU General Public License
6420 + * along with this program; if not, write to the Free Software
6421 + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
6425 + * lookup and dentry operations
6428 +#ifndef __AUFS_DENTRY_H__
6429 +#define __AUFS_DENTRY_H__
6433 +#include <linux/dcache.h>
6434 +#include <linux/aufs_type.h>
6437 +/* make a single member structure for future use */
6438 +/* todo: remove this structure */
6439 +struct au_hdentry {
6440 + struct dentry *hd_dentry;
6444 + atomic_t di_generation;
6446 + struct au_rwsem di_rwsem;
6447 + aufs_bindex_t di_bstart, di_bend, di_bwh, di_bdiropq;
6448 + struct au_hdentry *di_hdentry;
6451 +/* ---------------------------------------------------------------------- */
6454 +extern struct dentry_operations aufs_dop;
6456 +struct dentry *au_lkup_one(struct qstr *name, struct dentry *h_parent,
6457 + struct au_branch *br, struct nameidata *nd);
6458 +struct dentry *au_sio_lkup_one(struct qstr *name, struct dentry *parent,
6459 + struct au_branch *br);
6460 +int au_h_verify(struct dentry *h_dentry, unsigned int udba, struct inode *h_dir,
6461 + struct dentry *h_parent, struct au_branch *br);
6463 +int au_lkup_dentry(struct dentry *dentry, aufs_bindex_t bstart, mode_t type,
6464 + struct nameidata *nd);
6465 +int au_lkup_neg(struct dentry *dentry, aufs_bindex_t bindex);
6466 +int au_refresh_hdentry(struct dentry *dentry, mode_t type);
6467 +int au_reval_dpath(struct dentry *dentry, unsigned int sigen);
6470 +int au_alloc_dinfo(struct dentry *dentry);
6471 +int au_di_realloc(struct au_dinfo *dinfo, int nbr);
6473 +void di_read_lock(struct dentry *d, int flags, unsigned int lsc);
6474 +void di_read_unlock(struct dentry *d, int flags);
6475 +void di_downgrade_lock(struct dentry *d, int flags);
6476 +void di_write_lock(struct dentry *d, unsigned int lsc);
6477 +void di_write_unlock(struct dentry *d);
6478 +void di_write_lock2_child(struct dentry *d1, struct dentry *d2, int isdir);
6479 +void di_write_lock2_parent(struct dentry *d1, struct dentry *d2, int isdir);
6480 +void di_write_unlock2(struct dentry *d1, struct dentry *d2);
6482 +struct dentry *au_h_dptr(struct dentry *dentry, aufs_bindex_t bindex);
6483 +aufs_bindex_t au_dbtail(struct dentry *dentry);
6484 +aufs_bindex_t au_dbtaildir(struct dentry *dentry);
6486 +void au_set_h_dptr(struct dentry *dentry, aufs_bindex_t bindex,
6487 + struct dentry *h_dentry);
6488 +void au_update_digen(struct dentry *dentry);
6489 +void au_update_dbrange(struct dentry *dentry, int do_put_zero);
6490 +void au_update_dbstart(struct dentry *dentry);
6491 +void au_update_dbend(struct dentry *dentry);
6492 +int au_find_dbindex(struct dentry *dentry, struct dentry *h_dentry);
6494 +/* ---------------------------------------------------------------------- */
6496 +static inline struct au_dinfo *au_di(struct dentry *dentry)
6498 + return dentry->d_fsdata;
6501 +/* ---------------------------------------------------------------------- */
6503 +/* lock subclass for dinfo */
6505 + AuLsc_DI_CHILD, /* child first */
6506 + AuLsc_DI_CHILD2, /* rename(2), link(2), and cpup at hinotify */
6507 + AuLsc_DI_CHILD3, /* copyup dirs */
6514 + * di_read_lock_child, di_write_lock_child,
6515 + * di_read_lock_child2, di_write_lock_child2,
6516 + * di_read_lock_child3, di_write_lock_child3,
6517 + * di_read_lock_parent, di_write_lock_parent,
6518 + * di_read_lock_parent2, di_write_lock_parent2,
6519 + * di_read_lock_parent3, di_write_lock_parent3,
6521 +#define AuReadLockFunc(name, lsc) \
6522 +static inline void di_read_lock_##name(struct dentry *d, int flags) \
6523 +{ di_read_lock(d, flags, AuLsc_DI_##lsc); }
6525 +#define AuWriteLockFunc(name, lsc) \
6526 +static inline void di_write_lock_##name(struct dentry *d) \
6527 +{ di_write_lock(d, AuLsc_DI_##lsc); }
6529 +#define AuRWLockFuncs(name, lsc) \
6530 + AuReadLockFunc(name, lsc) \
6531 + AuWriteLockFunc(name, lsc)
6533 +AuRWLockFuncs(child, CHILD);
6534 +AuRWLockFuncs(child2, CHILD2);
6535 +AuRWLockFuncs(child3, CHILD3);
6536 +AuRWLockFuncs(parent, PARENT);
6537 +AuRWLockFuncs(parent2, PARENT2);
6538 +AuRWLockFuncs(parent3, PARENT3);
6540 +#undef AuReadLockFunc
6541 +#undef AuWriteLockFunc
6542 +#undef AuRWLockFuncs
6544 +#define DiMustNoWaiters(d) AuRwMustNoWaiters(&au_di(d)->di_rwsem)
6545 +#define DiMustAnyLock(d) AuRwMustAnyLock(&au_di(d)->di_rwsem)
6546 +#define DiMustWriteLock(d) AuRwMustWriteLock(&au_di(d)->di_rwsem)
6548 +/* ---------------------------------------------------------------------- */
6550 +/* todo: memory barrier? */
6551 +static inline unsigned int au_digen(struct dentry *d)
6553 + return atomic_read(&au_di(d)->di_generation);
6556 +static inline void au_h_dentry_init(struct au_hdentry *hdentry)
6558 + hdentry->hd_dentry = NULL;
6561 +static inline void au_hdput(struct au_hdentry *hd)
6563 + dput(hd->hd_dentry);
6566 +static inline aufs_bindex_t au_dbstart(struct dentry *dentry)
6568 + DiMustAnyLock(dentry);
6569 + return au_di(dentry)->di_bstart;
6572 +static inline aufs_bindex_t au_dbend(struct dentry *dentry)
6574 + DiMustAnyLock(dentry);
6575 + return au_di(dentry)->di_bend;
6578 +static inline aufs_bindex_t au_dbwh(struct dentry *dentry)
6580 + DiMustAnyLock(dentry);
6581 + return au_di(dentry)->di_bwh;
6584 +static inline aufs_bindex_t au_dbdiropq(struct dentry *dentry)
6586 + DiMustAnyLock(dentry);
6587 + return au_di(dentry)->di_bdiropq;
6590 +/* todo: hard/soft set? */
6591 +static inline void au_set_dbstart(struct dentry *dentry, aufs_bindex_t bindex)
6593 + DiMustWriteLock(dentry);
6594 + au_di(dentry)->di_bstart = bindex;
6597 +static inline void au_set_dbend(struct dentry *dentry, aufs_bindex_t bindex)
6599 + DiMustWriteLock(dentry);
6600 + au_di(dentry)->di_bend = bindex;
6603 +static inline void au_set_dbwh(struct dentry *dentry, aufs_bindex_t bindex)
6605 + DiMustWriteLock(dentry);
6606 + /* dbwh can be outside of bstart - bend range */
6607 + au_di(dentry)->di_bwh = bindex;
6610 +static inline void au_set_dbdiropq(struct dentry *dentry, aufs_bindex_t bindex)
6612 + DiMustWriteLock(dentry);
6613 + au_di(dentry)->di_bdiropq = bindex;
6616 +/* ---------------------------------------------------------------------- */
6618 +#ifdef CONFIG_AUFS_HINOTIFY
6619 +static inline void au_digen_dec(struct dentry *d)
6621 + atomic_dec_return(&au_di(d)->di_generation);
6624 +static inline void au_hin_di_reinit(struct dentry *dentry)
6626 + dentry->d_fsdata = NULL;
6629 +AuStubVoid(au_hin_di_reinit, struct dentry *dentry __maybe_unused)
6630 +#endif /* CONFIG_AUFS_HINOTIFY */
6632 +#endif /* __KERNEL__ */
6633 +#endif /* __AUFS_DENTRY_H__ */
6634 diff --git a/fs/aufs/dinfo.c b/fs/aufs/dinfo.c
6635 new file mode 100644
6636 index 0000000..0010c99
6638 +++ b/fs/aufs/dinfo.c
6641 + * Copyright (C) 2005-2009 Junjiro R. Okajima
6643 + * This program, aufs is free software; you can redistribute it and/or modify
6644 + * it under the terms of the GNU General Public License as published by
6645 + * the Free Software Foundation; either version 2 of the License, or
6646 + * (at your option) any later version.
6648 + * This program is distributed in the hope that it will be useful,
6649 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
6650 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
6651 + * GNU General Public License for more details.
6653 + * You should have received a copy of the GNU General Public License
6654 + * along with this program; if not, write to the Free Software
6655 + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
6659 + * dentry private data
6664 +int au_alloc_dinfo(struct dentry *dentry)
6666 + struct au_dinfo *dinfo;
6667 + struct super_block *sb;
6670 + dinfo = au_cache_alloc_dinfo();
6671 + if (unlikely(!dinfo))
6674 + sb = dentry->d_sb;
6675 + nbr = au_sbend(sb) + 1;
6678 + dinfo->di_hdentry = kcalloc(nbr, sizeof(*dinfo->di_hdentry), GFP_NOFS);
6679 + if (unlikely(!dinfo->di_hdentry))
6682 + atomic_set(&dinfo->di_generation, au_sigen(sb));
6683 + /* smp_mb(); */ /* atomic_set */
6684 + au_rw_init_wlock_nested(&dinfo->di_rwsem, AuLsc_DI_CHILD);
6685 + dinfo->di_bstart = -1;
6686 + dinfo->di_bend = -1;
6687 + dinfo->di_bwh = -1;
6688 + dinfo->di_bdiropq = -1;
6690 + dentry->d_fsdata = dinfo;
6691 + dentry->d_op = &aufs_dop;
6692 + return 0; /* success */
6695 + au_cache_free_dinfo(dinfo);
6700 +int au_di_realloc(struct au_dinfo *dinfo, int nbr)
6703 + struct au_hdentry *hdp;
6705 + AuRwMustWriteLock(&dinfo->di_rwsem);
6708 + sz = sizeof(*hdp) * (dinfo->di_bend + 1);
6710 + sz = sizeof(*hdp);
6711 + hdp = au_kzrealloc(dinfo->di_hdentry, sz, sizeof(*hdp) * nbr, GFP_NOFS);
6713 + dinfo->di_hdentry = hdp;
6720 +/* ---------------------------------------------------------------------- */
6722 +static void do_ii_write_lock(struct inode *inode, unsigned int lsc)
6725 + case AuLsc_DI_CHILD:
6726 + ii_write_lock_child(inode);
6728 + case AuLsc_DI_CHILD2:
6729 + ii_write_lock_child2(inode);
6731 + case AuLsc_DI_CHILD3:
6732 + ii_write_lock_child3(inode);
6734 + case AuLsc_DI_PARENT:
6735 + ii_write_lock_parent(inode);
6737 + case AuLsc_DI_PARENT2:
6738 + ii_write_lock_parent2(inode);
6740 + case AuLsc_DI_PARENT3:
6741 + ii_write_lock_parent3(inode);
6748 +static void do_ii_read_lock(struct inode *inode, unsigned int lsc)
6751 + case AuLsc_DI_CHILD:
6752 + ii_read_lock_child(inode);
6754 + case AuLsc_DI_CHILD2:
6755 + ii_read_lock_child2(inode);
6757 + case AuLsc_DI_CHILD3:
6758 + ii_read_lock_child3(inode);
6760 + case AuLsc_DI_PARENT:
6761 + ii_read_lock_parent(inode);
6763 + case AuLsc_DI_PARENT2:
6764 + ii_read_lock_parent2(inode);
6766 + case AuLsc_DI_PARENT3:
6767 + ii_read_lock_parent3(inode);
6774 +void di_read_lock(struct dentry *d, int flags, unsigned int lsc)
6776 + au_rw_read_lock_nested(&au_di(d)->di_rwsem, lsc);
6778 + if (au_ftest_lock(flags, IW))
6779 + do_ii_write_lock(d->d_inode, lsc);
6780 + else if (au_ftest_lock(flags, IR))
6781 + do_ii_read_lock(d->d_inode, lsc);
6785 +void di_read_unlock(struct dentry *d, int flags)
6788 + if (au_ftest_lock(flags, IW))
6789 + ii_write_unlock(d->d_inode);
6790 + else if (au_ftest_lock(flags, IR))
6791 + ii_read_unlock(d->d_inode);
6793 + au_rw_read_unlock(&au_di(d)->di_rwsem);
6796 +void di_downgrade_lock(struct dentry *d, int flags)
6798 + if (d->d_inode && au_ftest_lock(flags, IR))
6799 + ii_downgrade_lock(d->d_inode);
6800 + au_rw_dgrade_lock(&au_di(d)->di_rwsem);
6803 +void di_write_lock(struct dentry *d, unsigned int lsc)
6805 + au_rw_write_lock_nested(&au_di(d)->di_rwsem, lsc);
6807 + do_ii_write_lock(d->d_inode, lsc);
6810 +void di_write_unlock(struct dentry *d)
6813 + ii_write_unlock(d->d_inode);
6814 + au_rw_write_unlock(&au_di(d)->di_rwsem);
6817 +void di_write_lock2_child(struct dentry *d1, struct dentry *d2, int isdir)
6819 + AuDebugOn(d1 == d2
6820 + || d1->d_inode == d2->d_inode
6821 + || d1->d_sb != d2->d_sb);
6823 + if (isdir && au_test_subdir(d1, d2)) {
6824 + di_write_lock_child(d1);
6825 + di_write_lock_child2(d2);
6827 + /* there should be no races */
6828 + di_write_lock_child(d2);
6829 + di_write_lock_child2(d1);
6833 +void di_write_lock2_parent(struct dentry *d1, struct dentry *d2, int isdir)
6835 + AuDebugOn(d1 == d2
6836 + || d1->d_inode == d2->d_inode
6837 + || d1->d_sb != d2->d_sb);
6839 + if (isdir && au_test_subdir(d1, d2)) {
6840 + di_write_lock_parent(d1);
6841 + di_write_lock_parent2(d2);
6843 + /* there should be no races */
6844 + di_write_lock_parent(d2);
6845 + di_write_lock_parent2(d1);
6849 +void di_write_unlock2(struct dentry *d1, struct dentry *d2)
6851 + di_write_unlock(d1);
6852 + if (d1->d_inode == d2->d_inode)
6853 + au_rw_write_unlock(&au_di(d2)->di_rwsem);
6855 + di_write_unlock(d2);
6858 +/* ---------------------------------------------------------------------- */
6860 +struct dentry *au_h_dptr(struct dentry *dentry, aufs_bindex_t bindex)
6864 + DiMustAnyLock(dentry);
6866 + if (au_dbstart(dentry) < 0 || bindex < au_dbstart(dentry))
6868 + AuDebugOn(bindex < 0);
6869 + d = au_di(dentry)->di_hdentry[0 + bindex].hd_dentry;
6870 + AuDebugOn(d && (atomic_read(&d->d_count) <= 0));
6874 +aufs_bindex_t au_dbtail(struct dentry *dentry)
6876 + aufs_bindex_t bend, bwh;
6878 + bend = au_dbend(dentry);
6880 + bwh = au_dbwh(dentry);
6883 + if (0 < bwh && bwh < bend)
6889 +aufs_bindex_t au_dbtaildir(struct dentry *dentry)
6891 + aufs_bindex_t bend, bopq;
6893 + bend = au_dbtail(dentry);
6895 + bopq = au_dbdiropq(dentry);
6896 + if (0 <= bopq && bopq < bend)
6902 +/* ---------------------------------------------------------------------- */
6904 +void au_set_h_dptr(struct dentry *dentry, aufs_bindex_t bindex,
6905 + struct dentry *h_dentry)
6907 + struct au_hdentry *hd = au_di(dentry)->di_hdentry + bindex;
6909 + DiMustWriteLock(dentry);
6911 + if (hd->hd_dentry)
6913 + hd->hd_dentry = h_dentry;
6916 +void au_update_digen(struct dentry *dentry)
6918 + atomic_set(&au_di(dentry)->di_generation, au_sigen(dentry->d_sb));
6919 + /* smp_mb(); */ /* atomic_set */
6922 +void au_update_dbrange(struct dentry *dentry, int do_put_zero)
6924 + struct au_dinfo *dinfo;
6925 + struct dentry *h_d;
6927 + DiMustWriteLock(dentry);
6929 + dinfo = au_di(dentry);
6930 + if (!dinfo || dinfo->di_bstart < 0)
6933 + if (do_put_zero) {
6934 + aufs_bindex_t bindex, bend;
6936 + bend = dinfo->di_bend;
6937 + for (bindex = dinfo->di_bstart; bindex <= bend; bindex++) {
6938 + h_d = dinfo->di_hdentry[0 + bindex].hd_dentry;
6939 + if (h_d && !h_d->d_inode)
6940 + au_set_h_dptr(dentry, bindex, NULL);
6944 + dinfo->di_bstart = -1;
6945 + while (++dinfo->di_bstart <= dinfo->di_bend)
6946 + if (dinfo->di_hdentry[0 + dinfo->di_bstart].hd_dentry)
6948 + if (dinfo->di_bstart > dinfo->di_bend) {
6949 + dinfo->di_bstart = -1;
6950 + dinfo->di_bend = -1;
6955 + while (0 <= --dinfo->di_bend)
6956 + if (dinfo->di_hdentry[0 + dinfo->di_bend].hd_dentry)
6958 + AuDebugOn(dinfo->di_bstart > dinfo->di_bend || dinfo->di_bend < 0);
6961 +void au_update_dbstart(struct dentry *dentry)
6963 + aufs_bindex_t bindex, bend;
6964 + struct dentry *h_dentry;
6966 + bend = au_dbend(dentry);
6967 + for (bindex = au_dbstart(dentry); bindex <= bend; bindex++) {
6968 + h_dentry = au_h_dptr(dentry, bindex);
6971 + if (h_dentry->d_inode) {
6972 + au_set_dbstart(dentry, bindex);
6975 + au_set_h_dptr(dentry, bindex, NULL);
6979 +void au_update_dbend(struct dentry *dentry)
6981 + aufs_bindex_t bindex, bstart;
6982 + struct dentry *h_dentry;
6984 + bstart = au_dbstart(dentry);
6985 + for (bindex = au_dbend(dentry); bindex <= bstart; bindex--) {
6986 + h_dentry = au_h_dptr(dentry, bindex);
6989 + if (h_dentry->d_inode) {
6990 + au_set_dbend(dentry, bindex);
6993 + au_set_h_dptr(dentry, bindex, NULL);
6997 +int au_find_dbindex(struct dentry *dentry, struct dentry *h_dentry)
6999 + aufs_bindex_t bindex, bend;
7001 + bend = au_dbend(dentry);
7002 + for (bindex = au_dbstart(dentry); bindex <= bend; bindex++)
7003 + if (au_h_dptr(dentry, bindex) == h_dentry)
7007 diff --git a/fs/aufs/dir.c b/fs/aufs/dir.c
7008 new file mode 100644
7009 index 0000000..c9d8284
7014 + * Copyright (C) 2005-2009 Junjiro R. Okajima
7016 + * This program, aufs is free software; you can redistribute it and/or modify
7017 + * it under the terms of the GNU General Public License as published by
7018 + * the Free Software Foundation; either version 2 of the License, or
7019 + * (at your option) any later version.
7021 + * This program is distributed in the hope that it will be useful,
7022 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
7023 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
7024 + * GNU General Public License for more details.
7026 + * You should have received a copy of the GNU General Public License
7027 + * along with this program; if not, write to the Free Software
7028 + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
7032 + * directory operations
7035 +#include <linux/file.h>
7036 +#include <linux/fs_stack.h>
7039 +void au_add_nlink(struct inode *dir, struct inode *h_dir)
7041 + AuDebugOn(!S_ISDIR(dir->i_mode) || !S_ISDIR(h_dir->i_mode));
7043 + dir->i_nlink += h_dir->i_nlink - 2;
7044 + if (h_dir->i_nlink < 2)
7045 + dir->i_nlink += 2;
7048 +void au_sub_nlink(struct inode *dir, struct inode *h_dir)
7050 + AuDebugOn(!S_ISDIR(dir->i_mode) || !S_ISDIR(h_dir->i_mode));
7052 + dir->i_nlink -= h_dir->i_nlink - 2;
7053 + if (h_dir->i_nlink < 2)
7054 + dir->i_nlink -= 2;
7057 +loff_t au_dir_size(struct file *file, struct dentry *dentry)
7060 + aufs_bindex_t bindex, bend;
7061 + struct file *h_file;
7062 + struct dentry *h_dentry;
7066 + AuDebugOn(!file->f_dentry);
7067 + AuDebugOn(!file->f_dentry->d_inode);
7068 + AuDebugOn(!S_ISDIR(file->f_dentry->d_inode->i_mode));
7070 + bend = au_fbend(file);
7071 + for (bindex = au_fbstart(file);
7072 + bindex <= bend && sz < KMALLOC_MAX_SIZE;
7074 + h_file = au_h_fptr(file, bindex);
7076 + && h_file->f_dentry
7077 + && h_file->f_dentry->d_inode)
7078 + sz += i_size_read(h_file->f_dentry->d_inode);
7081 + AuDebugOn(!dentry);
7082 + AuDebugOn(!dentry->d_inode);
7083 + AuDebugOn(!S_ISDIR(dentry->d_inode->i_mode));
7085 + bend = au_dbtaildir(dentry);
7086 + for (bindex = au_dbstart(dentry);
7087 + bindex <= bend && sz < KMALLOC_MAX_SIZE;
7089 + h_dentry = au_h_dptr(dentry, bindex);
7090 + if (h_dentry && h_dentry->d_inode)
7091 + sz += i_size_read(h_dentry->d_inode);
7094 + if (sz < KMALLOC_MAX_SIZE)
7095 + sz = roundup_pow_of_two(sz);
7096 + if (sz > KMALLOC_MAX_SIZE)
7097 + sz = KMALLOC_MAX_SIZE;
7098 + else if (sz < NAME_MAX) {
7099 + BUILD_BUG_ON(AUFS_RDBLK_DEF < NAME_MAX);
7100 + sz = AUFS_RDBLK_DEF;
7105 +/* ---------------------------------------------------------------------- */
7107 +static int reopen_dir(struct file *file)
7110 + unsigned int flags;
7111 + aufs_bindex_t bindex, btail, bstart;
7112 + struct dentry *dentry, *h_dentry;
7113 + struct file *h_file;
7115 + /* open all lower dirs */
7116 + dentry = file->f_dentry;
7117 + bstart = au_dbstart(dentry);
7118 + for (bindex = au_fbstart(file); bindex < bstart; bindex++)
7119 + au_set_h_fptr(file, bindex, NULL);
7120 + au_set_fbstart(file, bstart);
7122 + btail = au_dbtaildir(dentry);
7123 + for (bindex = au_fbend(file); btail < bindex; bindex--)
7124 + au_set_h_fptr(file, bindex, NULL);
7125 + au_set_fbend(file, btail);
7127 + flags = file->f_flags;
7128 + for (bindex = bstart; bindex <= btail; bindex++) {
7129 + h_dentry = au_h_dptr(dentry, bindex);
7132 + h_file = au_h_fptr(file, bindex);
7136 + h_file = au_h_open(dentry, bindex, flags, file);
7137 + err = PTR_ERR(h_file);
7138 + if (IS_ERR(h_file))
7139 + goto out; /* close all? */
7140 + au_set_h_fptr(file, bindex, h_file);
7142 + au_update_figen(file);
7143 + /* todo: necessary? */
7144 + /* file->f_ra = h_file->f_ra; */
7151 +static int do_open_dir(struct file *file, int flags)
7154 + aufs_bindex_t bindex, btail;
7155 + struct dentry *dentry, *h_dentry;
7156 + struct file *h_file;
7158 + FiMustWriteLock(file);
7161 + dentry = file->f_dentry;
7162 + au_set_fvdir_cache(file, NULL);
7163 + file->f_version = dentry->d_inode->i_version;
7164 + bindex = au_dbstart(dentry);
7165 + au_set_fbstart(file, bindex);
7166 + btail = au_dbtaildir(dentry);
7167 + au_set_fbend(file, btail);
7168 + for (; !err && bindex <= btail; bindex++) {
7169 + h_dentry = au_h_dptr(dentry, bindex);
7173 + h_file = au_h_open(dentry, bindex, flags, file);
7174 + if (IS_ERR(h_file)) {
7175 + err = PTR_ERR(h_file);
7178 + au_set_h_fptr(file, bindex, h_file);
7180 + au_update_figen(file);
7181 + /* todo: necessary? */
7182 + /* file->f_ra = h_file->f_ra; */
7184 + return 0; /* success */
7187 + for (bindex = au_fbstart(file); bindex <= btail; bindex++)
7188 + au_set_h_fptr(file, bindex, NULL);
7189 + au_set_fbstart(file, -1);
7190 + au_set_fbend(file, -1);
7194 +static int aufs_open_dir(struct inode *inode __maybe_unused,
7195 + struct file *file)
7197 + return au_do_open(file, do_open_dir);
7200 +static int aufs_release_dir(struct inode *inode __maybe_unused,
7201 + struct file *file)
7203 + struct au_vdir *vdir_cache;
7204 + struct super_block *sb;
7206 + sb = file->f_dentry->d_sb;
7207 + vdir_cache = au_fi(file)->fi_vdir_cache; /* lock-free */
7209 + au_vdir_free(vdir_cache);
7210 + au_plink_maint_leave(file);
7211 + au_finfo_fin(file);
7215 +/* ---------------------------------------------------------------------- */
7217 +static int au_do_fsync_dir_no_file(struct dentry *dentry, int datasync)
7220 + aufs_bindex_t bend, bindex;
7221 + struct inode *inode;
7222 + struct super_block *sb;
7225 + sb = dentry->d_sb;
7226 + inode = dentry->d_inode;
7228 + bend = au_dbend(dentry);
7229 + for (bindex = au_dbstart(dentry); !err && bindex <= bend; bindex++) {
7230 + struct path h_path;
7231 + struct inode *h_inode;
7233 + if (au_test_ro(sb, bindex, inode))
7235 + h_path.dentry = au_h_dptr(dentry, bindex);
7236 + if (!h_path.dentry)
7238 + h_inode = h_path.dentry->d_inode;
7242 + /* no mnt_want_write() */
7243 + /* cf. fs/nsfd/vfs.c and fs/nfsd/nfs4recover.c */
7244 + /* todo: inotiry fired? */
7245 + h_path.mnt = au_sbr_mnt(sb, bindex);
7246 + mutex_lock(&h_inode->i_mutex);
7247 + err = filemap_fdatawrite(h_inode->i_mapping);
7248 + AuDebugOn(!h_inode->i_fop);
7249 + if (!err && h_inode->i_fop->fsync)
7250 + err = h_inode->i_fop->fsync(NULL, h_path.dentry,
7253 + err = filemap_fdatawrite(h_inode->i_mapping);
7255 + vfsub_update_h_iattr(&h_path, /*did*/NULL); /*ignore*/
7256 + mutex_unlock(&h_inode->i_mutex);
7262 +static int au_do_fsync_dir(struct file *file, int datasync)
7265 + aufs_bindex_t bend, bindex;
7266 + struct file *h_file;
7267 + struct super_block *sb;
7268 + struct inode *inode;
7269 + struct mutex *h_mtx;
7271 + err = au_reval_and_lock_fdi(file, reopen_dir, /*wlock*/1);
7272 + if (unlikely(err))
7275 + sb = file->f_dentry->d_sb;
7276 + inode = file->f_dentry->d_inode;
7277 + bend = au_fbend(file);
7278 + for (bindex = au_fbstart(file); !err && bindex <= bend; bindex++) {
7279 + h_file = au_h_fptr(file, bindex);
7280 + if (!h_file || au_test_ro(sb, bindex, inode))
7283 + err = (int)do_fsync(h_file, datasync);
7285 + h_mtx = &h_file->f_dentry->d_inode->i_mutex;
7286 + mutex_lock(h_mtx);
7287 + vfsub_update_h_iattr(&h_file->f_path, /*did*/NULL);
7289 + mutex_unlock(h_mtx);
7298 + * @file may be NULL
7300 +static int aufs_fsync_dir(struct file *file, struct dentry *dentry,
7304 + struct super_block *sb;
7306 + IMustLock(dentry->d_inode);
7309 + sb = dentry->d_sb;
7310 + si_noflush_read_lock(sb);
7312 + err = au_do_fsync_dir(file, datasync);
7314 + di_write_lock_child(dentry);
7315 + err = au_do_fsync_dir_no_file(dentry, datasync);
7317 + au_cpup_attr_timesizes(dentry->d_inode);
7318 + di_write_unlock(dentry);
7320 + fi_write_unlock(file);
7322 + si_read_unlock(sb);
7326 +/* ---------------------------------------------------------------------- */
7328 +static int aufs_readdir(struct file *file, void *dirent, filldir_t filldir)
7331 + struct dentry *dentry;
7332 + struct inode *inode;
7333 + struct super_block *sb;
7335 + dentry = file->f_dentry;
7336 + inode = dentry->d_inode;
7339 + sb = dentry->d_sb;
7340 + si_read_lock(sb, AuLock_FLUSH);
7341 + err = au_reval_and_lock_fdi(file, reopen_dir, /*wlock*/1);
7342 + if (unlikely(err))
7344 + err = au_vdir_init(file);
7345 + di_downgrade_lock(dentry, AuLock_IR);
7346 + if (unlikely(err))
7349 + if (!au_test_nfsd(current)) {
7350 + err = au_vdir_fill_de(file, dirent, filldir);
7351 + fsstack_copy_attr_atime(inode,
7352 + au_h_iptr(inode, au_ibstart(inode)));
7355 + * nfsd filldir may call lookup_one_len(), vfs_getattr(),
7356 + * encode_fh() and others.
7358 + struct inode *h_inode = au_h_iptr(inode, au_ibstart(inode));
7360 + di_read_unlock(dentry, AuLock_IR);
7361 + si_read_unlock(sb);
7363 + err = au_vdir_fill_de(file, dirent, filldir);
7365 + fsstack_copy_attr_atime(inode, h_inode);
7366 + fi_write_unlock(file);
7373 + di_read_unlock(dentry, AuLock_IR);
7374 + fi_write_unlock(file);
7376 + si_read_unlock(sb);
7380 +/* ---------------------------------------------------------------------- */
7382 +#define AuTestEmpty_WHONLY 1
7383 +#define AuTestEmpty_CALLED (1 << 1)
7384 +#define AuTestEmpty_SHWH (1 << 2)
7385 +#define au_ftest_testempty(flags, name) ((flags) & AuTestEmpty_##name)
7386 +#define au_fset_testempty(flags, name) { (flags) |= AuTestEmpty_##name; }
7387 +#define au_fclr_testempty(flags, name) { (flags) &= ~AuTestEmpty_##name; }
7389 +#ifndef CONFIG_AUFS_SHWH
7390 +#undef AuTestEmpty_SHWH
7391 +#define AuTestEmpty_SHWH 0
7394 +struct test_empty_arg {
7395 + struct au_nhash *whlist;
7396 + unsigned int flags;
7398 + aufs_bindex_t bindex;
7401 +static int test_empty_cb(void *__arg, const char *__name, int namelen,
7402 + loff_t offset __maybe_unused, u64 ino,
7403 + unsigned int d_type)
7405 + struct test_empty_arg *arg = __arg;
7406 + char *name = (void *)__name;
7409 + au_fset_testempty(arg->flags, CALLED);
7411 + if (name[0] == '.'
7412 + && (namelen == 1 || (name[1] == '.' && namelen == 2)))
7413 + goto out; /* success */
7415 + if (namelen <= AUFS_WH_PFX_LEN
7416 + || memcmp(name, AUFS_WH_PFX, AUFS_WH_PFX_LEN)) {
7417 + if (au_ftest_testempty(arg->flags, WHONLY)
7418 + && !au_nhash_test_known_wh(arg->whlist, name, namelen))
7419 + arg->err = -ENOTEMPTY;
7423 + name += AUFS_WH_PFX_LEN;
7424 + namelen -= AUFS_WH_PFX_LEN;
7425 + if (!au_nhash_test_known_wh(arg->whlist, name, namelen))
7426 + arg->err = au_nhash_append_wh
7427 + (arg->whlist, name, namelen, ino, d_type, arg->bindex,
7428 + au_ftest_testempty(arg->flags, SHWH));
7432 + AuTraceErr(arg->err);
7436 +static int do_test_empty(struct dentry *dentry, struct test_empty_arg *arg)
7439 + struct file *h_file;
7441 + h_file = au_h_open(dentry, arg->bindex,
7442 + O_RDONLY | O_NONBLOCK | O_DIRECTORY | O_LARGEFILE,
7444 + err = PTR_ERR(h_file);
7445 + if (IS_ERR(h_file))
7449 + if (!au_opt_test(au_mntflags(dentry->d_sb), UDBA_NONE)
7450 + && !h_file->f_dentry->d_inode->i_nlink)
7455 + au_fclr_testempty(arg->flags, CALLED);
7457 + err = vfsub_readdir(h_file, test_empty_cb, arg);
7460 + } while (!err && au_ftest_testempty(arg->flags, CALLED));
7464 + au_sbr_put(dentry->d_sb, arg->bindex);
7469 +struct do_test_empty_args {
7471 + struct dentry *dentry;
7472 + struct test_empty_arg *arg;
7475 +static void call_do_test_empty(void *args)
7477 + struct do_test_empty_args *a = args;
7478 + *a->errp = do_test_empty(a->dentry, a->arg);
7481 +static int sio_test_empty(struct dentry *dentry, struct test_empty_arg *arg)
7484 + struct dentry *h_dentry;
7485 + struct inode *h_inode;
7487 + h_dentry = au_h_dptr(dentry, arg->bindex);
7488 + h_inode = h_dentry->d_inode;
7489 + mutex_lock_nested(&h_inode->i_mutex, AuLsc_I_CHILD);
7490 + err = au_test_h_perm_sio(h_inode, MAY_EXEC | MAY_READ);
7491 + mutex_unlock(&h_inode->i_mutex);
7493 + err = do_test_empty(dentry, arg);
7495 + struct do_test_empty_args args = {
7500 + unsigned int flags = arg->flags;
7502 + wkq_err = au_wkq_wait(call_do_test_empty, &args);
7503 + if (unlikely(wkq_err))
7505 + arg->flags = flags;
7511 +int au_test_empty_lower(struct dentry *dentry)
7514 + unsigned int rdhash;
7515 + aufs_bindex_t bindex, bstart, btail;
7516 + struct au_nhash whlist;
7517 + struct test_empty_arg arg;
7519 + SiMustAnyLock(dentry->d_sb);
7521 + rdhash = au_sbi(dentry->d_sb)->si_rdhash;
7523 + rdhash = au_rdhash_est(au_dir_size(/*file*/NULL, dentry));
7524 + err = au_nhash_alloc(&whlist, rdhash, GFP_NOFS);
7525 + if (unlikely(err))
7529 + arg.whlist = &whlist;
7530 + bstart = au_dbstart(dentry);
7531 + if (au_opt_test(au_mntflags(dentry->d_sb), SHWH))
7532 + au_fset_testempty(arg.flags, SHWH);
7533 + arg.bindex = bstart;
7534 + err = do_test_empty(dentry, &arg);
7535 + if (unlikely(err))
7538 + au_fset_testempty(arg.flags, WHONLY);
7539 + btail = au_dbtaildir(dentry);
7540 + for (bindex = bstart + 1; !err && bindex <= btail; bindex++) {
7541 + struct dentry *h_dentry;
7543 + h_dentry = au_h_dptr(dentry, bindex);
7544 + if (h_dentry && h_dentry->d_inode) {
7545 + arg.bindex = bindex;
7546 + err = do_test_empty(dentry, &arg);
7551 + au_nhash_wh_free(&whlist);
7556 +int au_test_empty(struct dentry *dentry, struct au_nhash *whlist)
7559 + struct test_empty_arg arg;
7560 + aufs_bindex_t bindex, btail;
7563 + arg.whlist = whlist;
7564 + arg.flags = AuTestEmpty_WHONLY;
7565 + if (au_opt_test(au_mntflags(dentry->d_sb), SHWH))
7566 + au_fset_testempty(arg.flags, SHWH);
7567 + btail = au_dbtaildir(dentry);
7568 + for (bindex = au_dbstart(dentry); !err && bindex <= btail; bindex++) {
7569 + struct dentry *h_dentry;
7571 + h_dentry = au_h_dptr(dentry, bindex);
7572 + if (h_dentry && h_dentry->d_inode) {
7573 + arg.bindex = bindex;
7574 + err = sio_test_empty(dentry, &arg);
7581 +/* ---------------------------------------------------------------------- */
7583 +struct file_operations aufs_dir_fop = {
7584 + .read = generic_read_dir,
7585 + .readdir = aufs_readdir,
7586 + .unlocked_ioctl = aufs_ioctl_dir,
7587 + .open = aufs_open_dir,
7588 + .release = aufs_release_dir,
7589 + .flush = aufs_flush,
7590 + .fsync = aufs_fsync_dir
7592 diff --git a/fs/aufs/dir.h b/fs/aufs/dir.h
7593 new file mode 100644
7594 index 0000000..dc40539
7599 + * Copyright (C) 2005-2009 Junjiro R. Okajima
7601 + * This program, aufs is free software; you can redistribute it and/or modify
7602 + * it under the terms of the GNU General Public License as published by
7603 + * the Free Software Foundation; either version 2 of the License, or
7604 + * (at your option) any later version.
7606 + * This program is distributed in the hope that it will be useful,
7607 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
7608 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
7609 + * GNU General Public License for more details.
7611 + * You should have received a copy of the GNU General Public License
7612 + * along with this program; if not, write to the Free Software
7613 + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
7617 + * directory operations
7620 +#ifndef __AUFS_DIR_H__
7621 +#define __AUFS_DIR_H__
7625 +#include <linux/fs.h>
7626 +#include <linux/aufs_type.h>
7628 +/* ---------------------------------------------------------------------- */
7630 +/* need to be faster and smaller */
7633 + unsigned int nh_num;
7634 + struct hlist_head *nh_head;
7637 +struct au_vdir_destr {
7638 + unsigned char len;
7639 + unsigned char name[0];
7642 +struct au_vdir_dehstr {
7643 + struct hlist_node hash;
7644 + struct au_vdir_destr *str;
7647 +struct au_vdir_de {
7649 + unsigned char de_type;
7650 + /* caution: packed */
7651 + struct au_vdir_destr de_str;
7654 +struct au_vdir_wh {
7655 + struct hlist_node wh_hash;
7656 +#ifdef CONFIG_AUFS_SHWH
7658 + aufs_bindex_t wh_bindex;
7659 + unsigned char wh_type;
7661 + aufs_bindex_t wh_bindex;
7663 + /* caution: packed */
7664 + struct au_vdir_destr wh_str;
7667 +union au_vdir_deblk_p {
7668 + unsigned char *deblk;
7669 + struct au_vdir_de *de;
7673 + unsigned char **vd_deblk;
7674 + unsigned long vd_nblk;
7677 + union au_vdir_deblk_p p;
7680 + unsigned long vd_version;
7681 + unsigned int vd_deblk_sz;
7682 + unsigned long vd_jiffy;
7685 +/* ---------------------------------------------------------------------- */
7688 +extern struct file_operations aufs_dir_fop;
7689 +void au_add_nlink(struct inode *dir, struct inode *h_dir);
7690 +void au_sub_nlink(struct inode *dir, struct inode *h_dir);
7691 +loff_t au_dir_size(struct file *file, struct dentry *dentry);
7692 +int au_test_empty_lower(struct dentry *dentry);
7693 +int au_test_empty(struct dentry *dentry, struct au_nhash *whlist);
7696 +unsigned int au_rdhash_est(loff_t sz);
7697 +int au_nhash_alloc(struct au_nhash *nhash, unsigned int num_hash, gfp_t gfp);
7698 +void au_nhash_wh_free(struct au_nhash *whlist);
7699 +int au_nhash_test_longer_wh(struct au_nhash *whlist, aufs_bindex_t btgt,
7701 +int au_nhash_test_known_wh(struct au_nhash *whlist, char *name, int nlen);
7702 +int au_nhash_append_wh(struct au_nhash *whlist, char *name, int nlen, ino_t ino,
7703 + unsigned int d_type, aufs_bindex_t bindex,
7704 + unsigned char shwh);
7705 +void au_vdir_free(struct au_vdir *vdir);
7706 +int au_vdir_init(struct file *file);
7707 +int au_vdir_fill_de(struct file *file, void *dirent, filldir_t filldir);
7710 +long aufs_ioctl_dir(struct file *file, unsigned int cmd, unsigned long arg);
7712 +#ifdef CONFIG_AUFS_RDU
7714 +long au_rdu_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
7716 +static inline long au_rdu_ioctl(struct file *file, unsigned int cmd,
7717 + unsigned long arg)
7723 +#endif /* __KERNEL__ */
7724 +#endif /* __AUFS_DIR_H__ */
7725 diff --git a/fs/aufs/export.c b/fs/aufs/export.c
7726 new file mode 100644
7727 index 0000000..3d13ff5
7729 +++ b/fs/aufs/export.c
7732 + * Copyright (C) 2005-2009 Junjiro R. Okajima
7734 + * This program, aufs is free software; you can redistribute it and/or modify
7735 + * it under the terms of the GNU General Public License as published by
7736 + * the Free Software Foundation; either version 2 of the License, or
7737 + * (at your option) any later version.
7739 + * This program is distributed in the hope that it will be useful,
7740 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
7741 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
7742 + * GNU General Public License for more details.
7744 + * You should have received a copy of the GNU General Public License
7745 + * along with this program; if not, write to the Free Software
7746 + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
7753 +#include <linux/exportfs.h>
7754 +#include <linux/file.h>
7755 +#include <linux/mnt_namespace.h>
7756 +#include <linux/namei.h>
7757 +#include <linux/random.h>
7761 +#ifdef CONFIG_AUFS_INO_T_64
7769 +static ino_t decode_ino(__u32 *a)
7773 + BUILD_BUG_ON(sizeof(u.ino) != sizeof(u.a));
7775 +#ifdef CONFIG_AUFS_INO_T_64
7781 +static void encode_ino(__u32 *a, ino_t ino)
7787 +#ifdef CONFIG_AUFS_INO_T_64
7792 +/* NFS file handle */
7796 +#ifdef CONFIG_AUFS_INO_T_64
7797 + /* support 64bit inode number */
7811 + Fh_dir_ino = Fh_dir_ino1
7814 +static int au_test_anon(struct dentry *dentry)
7816 + return !!(dentry->d_flags & DCACHE_DISCONNECTED);
7819 +/* ---------------------------------------------------------------------- */
7820 +/* inode generation external table */
7822 +int au_xigen_inc(struct inode *inode)
7828 + struct super_block *sb;
7829 + struct au_sbinfo *sbinfo;
7833 + sbinfo = au_sbi(sb);
7835 + * temporary workaround for escaping from SiMustAnyLock() in
7836 + * au_mntflags(), since this function is called from au_iinfo_fin().
7838 + if (unlikely(!au_opt_test(sbinfo->si_mntflags, XINO)))
7841 + pos = inode->i_ino;
7842 + pos *= sizeof(igen);
7843 + igen = inode->i_generation + 1;
7844 + sz = xino_fwrite(sbinfo->si_xwrite, sbinfo->si_xigen, &igen,
7845 + sizeof(igen), &pos);
7846 + if (sz == sizeof(igen))
7847 + goto out; /* success */
7850 + if (unlikely(sz >= 0)) {
7852 + AuIOErr("xigen error (%zd)\n", sz);
7859 +int au_xigen_new(struct inode *inode)
7864 + struct super_block *sb;
7865 + struct au_sbinfo *sbinfo;
7866 + struct file *file;
7869 + /* todo: dirty, at mount time */
7870 + if (inode->i_ino == AUFS_ROOT_INO)
7873 + SiMustAnyLock(sb);
7874 + if (unlikely(!au_opt_test(au_mntflags(sb), XINO)))
7878 + pos = inode->i_ino;
7879 + if (unlikely(au_loff_max / sizeof(inode->i_generation) - 1 < pos)) {
7880 + AuIOErr1("too large i%lld\n", pos);
7883 + pos *= sizeof(inode->i_generation);
7886 + sbinfo = au_sbi(sb);
7887 + file = sbinfo->si_xigen;
7890 + if (i_size_read(file->f_dentry->d_inode)
7891 + < pos + sizeof(inode->i_generation)) {
7892 + inode->i_generation = atomic_inc_return(&sbinfo->si_xigen_next);
7893 + sz = xino_fwrite(sbinfo->si_xwrite, file, &inode->i_generation,
7894 + sizeof(inode->i_generation), &pos);
7896 + sz = xino_fread(sbinfo->si_xread, file, &inode->i_generation,
7897 + sizeof(inode->i_generation), &pos);
7898 + if (sz == sizeof(inode->i_generation))
7899 + goto out; /* success */
7902 + if (unlikely(sz >= 0)) {
7904 + AuIOErr("xigen error (%zd)\n", sz);
7911 +int au_xigen_set(struct super_block *sb, struct file *base)
7914 + struct au_sbinfo *sbinfo;
7915 + struct file *file;
7917 + SiMustWriteLock(sb);
7919 + sbinfo = au_sbi(sb);
7920 + file = au_xino_create2(base, sbinfo->si_xigen);
7921 + err = PTR_ERR(file);
7925 + if (sbinfo->si_xigen)
7926 + fput(sbinfo->si_xigen);
7927 + sbinfo->si_xigen = file;
7933 +void au_xigen_clr(struct super_block *sb)
7935 + struct au_sbinfo *sbinfo;
7937 + SiMustWriteLock(sb);
7939 + sbinfo = au_sbi(sb);
7940 + if (sbinfo->si_xigen) {
7941 + fput(sbinfo->si_xigen);
7942 + sbinfo->si_xigen = NULL;
7946 +/* ---------------------------------------------------------------------- */
7948 +static struct dentry *decode_by_ino(struct super_block *sb, ino_t ino,
7951 + struct dentry *dentry, *d;
7952 + struct inode *inode;
7953 + unsigned int sigen;
7956 + inode = ilookup(sb, ino);
7960 + dentry = ERR_PTR(-ESTALE);
7961 + sigen = au_sigen(sb);
7962 + if (unlikely(is_bad_inode(inode)
7963 + || IS_DEADDIR(inode)
7964 + || sigen != au_iigen(inode)))
7968 + if (!dir_ino || S_ISDIR(inode->i_mode))
7969 + dentry = d_find_alias(inode);
7971 + spin_lock(&dcache_lock);
7972 + list_for_each_entry(d, &inode->i_dentry, d_alias)
7973 + if (!au_test_anon(d)
7974 + && d->d_parent->d_inode->i_ino == dir_ino) {
7975 + dentry = dget_locked(d);
7978 + spin_unlock(&dcache_lock);
7980 + if (unlikely(dentry && sigen != au_digen(dentry))) {
7982 + dentry = ERR_PTR(-ESTALE);
7991 +/* ---------------------------------------------------------------------- */
7994 +/* if exportfs_decode_fh() passed vfsmount*, we could be happy */
7995 +static struct vfsmount *au_mnt_get(struct super_block *sb)
7997 + struct mnt_namespace *ns;
7998 + struct vfsmount *pos, *mnt;
8000 + spin_lock(&vfsmount_lock);
8001 + /* no get/put ?? */
8002 + AuDebugOn(!current->nsproxy);
8003 + ns = current->nsproxy->mnt_ns;
8006 + /* the order (reverse) will not be a problem */
8007 + list_for_each_entry(pos, &ns->list, mnt_list)
8008 + if (pos->mnt_sb == sb) {
8009 + mnt = mntget(pos);
8012 + spin_unlock(&vfsmount_lock);
8018 +struct au_nfsd_si_lock {
8019 + const unsigned int sigen;
8020 + const aufs_bindex_t br_id;
8021 + unsigned char force_lock;
8024 +static aufs_bindex_t si_nfsd_read_lock(struct super_block *sb,
8025 + struct au_nfsd_si_lock *nsi_lock)
8027 + aufs_bindex_t bindex;
8029 + si_read_lock(sb, AuLock_FLUSH);
8031 + /* branch id may be wrapped around */
8032 + bindex = au_br_index(sb, nsi_lock->br_id);
8033 + if (bindex >= 0 && nsi_lock->sigen + AUFS_BRANCH_MAX > au_sigen(sb))
8034 + goto out; /* success */
8036 + if (!nsi_lock->force_lock)
8037 + si_read_unlock(sb);
8044 +struct find_name_by_ino {
8045 + int called, found;
8052 +find_name_by_ino(void *arg, const char *name, int namelen, loff_t offset,
8053 + u64 ino, unsigned int d_type)
8055 + struct find_name_by_ino *a = arg;
8058 + if (a->ino != ino)
8061 + memcpy(a->name, name, namelen);
8062 + a->namelen = namelen;
8067 +static struct dentry *au_lkup_by_ino(struct path *path, ino_t ino,
8068 + struct au_nfsd_si_lock *nsi_lock)
8070 + struct dentry *dentry, *parent;
8071 + struct file *file;
8072 + struct inode *dir;
8073 + struct find_name_by_ino arg;
8076 + parent = path->dentry;
8078 + si_read_unlock(parent->d_sb);
8080 + file = dentry_open(parent, path->mnt, au_dir_roflags);
8081 + dentry = (void *)file;
8085 + dentry = ERR_PTR(-ENOMEM);
8086 + arg.name = __getname();
8087 + if (unlikely(!arg.name))
8094 + err = vfsub_readdir(file, find_name_by_ino, &arg);
8095 + } while (!err && !arg.found && arg.called);
8096 + dentry = ERR_PTR(err);
8097 + if (unlikely(err))
8099 + dentry = ERR_PTR(-ENOENT);
8103 + /* do not call au_lkup_one() */
8104 + dir = parent->d_inode;
8105 + mutex_lock(&dir->i_mutex);
8106 + dentry = vfsub_lookup_one_len(arg.name, parent, arg.namelen);
8107 + mutex_unlock(&dir->i_mutex);
8108 + AuTraceErrPtr(dentry);
8109 + if (IS_ERR(dentry))
8111 + AuDebugOn(au_test_anon(dentry));
8112 + if (unlikely(!dentry->d_inode)) {
8114 + dentry = ERR_PTR(-ENOENT);
8118 + __putname(arg.name);
8122 + if (unlikely(nsi_lock
8123 + && si_nfsd_read_lock(parent->d_sb, nsi_lock) < 0))
8124 + if (!IS_ERR(dentry)) {
8126 + dentry = ERR_PTR(-ESTALE);
8128 + AuTraceErrPtr(dentry);
8132 +static struct dentry *decode_by_dir_ino(struct super_block *sb, ino_t ino,
8134 + struct au_nfsd_si_lock *nsi_lock)
8136 + struct dentry *dentry;
8139 + if (dir_ino != AUFS_ROOT_INO) {
8140 + path.dentry = decode_by_ino(sb, dir_ino, 0);
8141 + dentry = path.dentry;
8142 + if (!path.dentry || IS_ERR(path.dentry))
8144 + AuDebugOn(au_test_anon(path.dentry));
8146 + path.dentry = dget(sb->s_root);
8148 + path.mnt = au_mnt_get(sb);
8149 + dentry = au_lkup_by_ino(&path, ino, nsi_lock);
8153 + AuTraceErrPtr(dentry);
8157 +/* ---------------------------------------------------------------------- */
8159 +static int h_acceptable(void *expv, struct dentry *dentry)
8164 +static char *au_build_path(struct dentry *h_parent, struct path *h_rootpath,
8165 + char *buf, int len, struct super_block *sb)
8171 + p = d_path(h_rootpath, buf, len);
8176 + path.mnt = h_rootpath->mnt;
8177 + path.dentry = h_parent;
8178 + p = d_path(&path, buf, len);
8184 + path.mnt = au_mnt_get(sb);
8185 + path.dentry = sb->s_root;
8186 + p = d_path(&path, buf, len - strlen(p));
8191 + p[strlen(p)] = '/';
8198 +static noinline_for_stack
8199 +struct dentry *decode_by_path(struct super_block *sb, aufs_bindex_t bindex,
8200 + ino_t ino, __u32 *fh, int fh_len,
8201 + struct au_nfsd_si_lock *nsi_lock)
8203 + struct dentry *dentry, *h_parent, *root;
8204 + struct super_block *h_sb;
8205 + char *pathname, *p;
8206 + struct vfsmount *h_mnt;
8207 + struct au_branch *br;
8209 + struct nameidata nd;
8211 + br = au_sbr(sb, bindex);
8212 + /* au_br_get(br); */
8213 + h_mnt = br->br_mnt;
8214 + h_sb = h_mnt->mnt_sb;
8215 + /* todo: call lower fh_to_dentry()? fh_to_parent()? */
8216 + h_parent = exportfs_decode_fh(h_mnt, (void *)(fh + Fh_tail),
8217 + fh_len - Fh_tail, fh[Fh_h_type],
8218 + h_acceptable, /*context*/NULL);
8219 + dentry = h_parent;
8220 + if (unlikely(!h_parent || IS_ERR(h_parent))) {
8221 + AuWarn1("%s decode_fh failed, %ld\n",
8222 + au_sbtype(h_sb), PTR_ERR(h_parent));
8226 + if (unlikely(au_test_anon(h_parent))) {
8227 + AuWarn1("%s decode_fh returned a disconnected dentry\n",
8229 + goto out_h_parent;
8232 + dentry = ERR_PTR(-ENOMEM);
8233 + pathname = (void *)__get_free_page(GFP_NOFS);
8234 + if (unlikely(!pathname))
8235 + goto out_h_parent;
8237 + root = sb->s_root;
8238 + nd.path.mnt = h_mnt;
8239 + di_read_lock_parent(root, !AuLock_IR);
8240 + nd.path.dentry = au_h_dptr(root, bindex);
8241 + di_read_unlock(root, !AuLock_IR);
8242 + p = au_build_path(h_parent, &nd.path, pathname, PAGE_SIZE, sb);
8243 + dentry = (void *)p;
8245 + goto out_pathname;
8247 + si_read_unlock(sb);
8248 + err = vfsub_path_lookup(p, LOOKUP_FOLLOW | LOOKUP_DIRECTORY, &nd);
8249 + dentry = ERR_PTR(err);
8250 + if (unlikely(err))
8253 + dentry = ERR_PTR(-ENOENT);
8254 + AuDebugOn(au_test_anon(nd.path.dentry));
8255 + if (unlikely(!nd.path.dentry->d_inode))
8258 + if (ino != nd.path.dentry->d_inode->i_ino)
8259 + dentry = au_lkup_by_ino(&nd.path, ino, /*nsi_lock*/NULL);
8261 + dentry = dget(nd.path.dentry);
8264 + path_put(&nd.path);
8266 + if (unlikely(si_nfsd_read_lock(sb, nsi_lock) < 0))
8267 + if (!IS_ERR(dentry)) {
8269 + dentry = ERR_PTR(-ESTALE);
8272 + free_page((unsigned long)pathname);
8276 + /* au_br_put(br); */
8277 + AuTraceErrPtr(dentry);
8281 +/* ---------------------------------------------------------------------- */
8283 +static struct dentry *
8284 +aufs_fh_to_dentry(struct super_block *sb, struct fid *fid, int fh_len,
8287 + struct dentry *dentry;
8288 + __u32 *fh = fid->raw;
8289 + ino_t ino, dir_ino;
8290 + aufs_bindex_t bindex;
8291 + struct au_nfsd_si_lock nsi_lock = {
8292 + .sigen = fh[Fh_sigen],
8293 + .br_id = fh[Fh_br_id],
8297 + AuDebugOn(fh_len < Fh_tail);
8299 + dentry = ERR_PTR(-ESTALE);
8300 + /* branch id may be wrapped around */
8301 + bindex = si_nfsd_read_lock(sb, &nsi_lock);
8302 + if (unlikely(bindex < 0))
8304 + nsi_lock.force_lock = 1;
8306 + /* is this inode still cached? */
8307 + ino = decode_ino(fh + Fh_ino);
8308 + AuDebugOn(ino == AUFS_ROOT_INO);
8309 + dir_ino = decode_ino(fh + Fh_dir_ino);
8310 + dentry = decode_by_ino(sb, ino, dir_ino);
8311 + if (IS_ERR(dentry))
8316 + /* is the parent dir cached? */
8317 + dentry = decode_by_dir_ino(sb, ino, dir_ino, &nsi_lock);
8318 + if (IS_ERR(dentry))
8324 + dentry = decode_by_path(sb, bindex, ino, fh, fh_len, &nsi_lock);
8325 + if (IS_ERR(dentry))
8327 + if (unlikely(!dentry))
8328 + /* todo?: make it ESTALE */
8332 + if (dentry->d_inode->i_generation == fh[Fh_igen])
8333 + goto out_unlock; /* success */
8336 + dentry = ERR_PTR(-ESTALE);
8338 + si_read_unlock(sb);
8340 + AuTraceErrPtr(dentry);
8344 +#if 0 /* reserved for future use */
8345 +/* support subtreecheck option */
8346 +static struct dentry *aufs_fh_to_parent(struct super_block *sb, struct fid *fid,
8347 + int fh_len, int fh_type)
8349 + struct dentry *parent;
8350 + __u32 *fh = fid->raw;
8353 + dir_ino = decode_ino(fh + Fh_dir_ino);
8354 + parent = decode_by_ino(sb, dir_ino, 0);
8355 + if (IS_ERR(parent))
8358 + parent = decode_by_path(sb, au_br_index(sb, fh[Fh_br_id]),
8359 + dir_ino, fh, fh_len);
8362 + AuTraceErrPtr(parent);
8367 +/* ---------------------------------------------------------------------- */
8369 +static int aufs_encode_fh(struct dentry *dentry, __u32 *fh, int *max_len,
8373 + aufs_bindex_t bindex, bend;
8374 + struct super_block *sb, *h_sb;
8375 + struct inode *inode;
8376 + struct dentry *parent, *h_parent;
8377 + struct au_branch *br;
8379 + AuDebugOn(au_test_anon(dentry));
8383 + if (unlikely(*max_len <= Fh_tail)) {
8384 + AuWarn1("NFSv2 client (max_len %d)?\n", *max_len);
8388 + err = FILEID_ROOT;
8389 + if (IS_ROOT(dentry)) {
8390 + AuDebugOn(dentry->d_inode->i_ino != AUFS_ROOT_INO);
8396 + sb = dentry->d_sb;
8397 + aufs_read_lock(dentry, AuLock_FLUSH | AuLock_IR);
8398 + parent = dget_parent(dentry);
8399 + di_read_lock_parent(parent, !AuLock_IR);
8400 + inode = dentry->d_inode;
8401 + AuDebugOn(!inode);
8402 +#ifdef CONFIG_AUFS_DEBUG
8403 + if (unlikely(!au_opt_test(au_mntflags(sb), XINO)))
8404 + AuWarn1("NFS-exporting requires xino\n");
8407 + bend = au_dbtaildir(parent);
8408 + for (bindex = au_dbstart(parent); bindex <= bend; bindex++) {
8409 + h_parent = au_h_dptr(parent, bindex);
8415 + if (unlikely(!h_parent))
8419 + br = au_sbr(sb, bindex);
8420 + h_sb = br->br_mnt->mnt_sb;
8421 + if (unlikely(!h_sb->s_export_op)) {
8422 + AuErr1("%s branch is not exportable\n", au_sbtype(h_sb));
8426 + fh[Fh_br_id] = br->br_id;
8427 + fh[Fh_sigen] = au_sigen(sb);
8428 + encode_ino(fh + Fh_ino, inode->i_ino);
8429 + encode_ino(fh + Fh_dir_ino, parent->d_inode->i_ino);
8430 + fh[Fh_igen] = inode->i_generation;
8432 + *max_len -= Fh_tail;
8433 + fh[Fh_h_type] = exportfs_encode_fh(h_parent, (void *)(fh + Fh_tail),
8435 + /*connectable or subtreecheck*/0);
8436 + err = fh[Fh_h_type];
8437 + *max_len += Fh_tail;
8438 + /* todo: macros? */
8442 + AuWarn1("%s encode_fh failed\n", au_sbtype(h_sb));
8447 + di_read_unlock(parent, !AuLock_IR);
8449 + aufs_read_unlock(dentry, AuLock_IR);
8451 + if (unlikely(err < 0))
8456 +/* ---------------------------------------------------------------------- */
8458 +static struct export_operations aufs_export_op = {
8459 + .fh_to_dentry = aufs_fh_to_dentry,
8460 + /* .fh_to_parent = aufs_fh_to_parent, */
8461 + .encode_fh = aufs_encode_fh
8464 +void au_export_init(struct super_block *sb)
8466 + struct au_sbinfo *sbinfo;
8469 + sb->s_export_op = &aufs_export_op;
8470 + sbinfo = au_sbi(sb);
8471 + sbinfo->si_xigen = NULL;
8472 + get_random_bytes(&u, sizeof(u));
8473 + BUILD_BUG_ON(sizeof(u) != sizeof(int));
8474 + atomic_set(&sbinfo->si_xigen_next, u);
8476 diff --git a/fs/aufs/f_op.c b/fs/aufs/f_op.c
8477 new file mode 100644
8478 index 0000000..867d1e1
8480 +++ b/fs/aufs/f_op.c
8483 + * Copyright (C) 2005-2009 Junjiro R. Okajima
8485 + * This program, aufs is free software; you can redistribute it and/or modify
8486 + * it under the terms of the GNU General Public License as published by
8487 + * the Free Software Foundation; either version 2 of the License, or
8488 + * (at your option) any later version.
8490 + * This program is distributed in the hope that it will be useful,
8491 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
8492 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
8493 + * GNU General Public License for more details.
8495 + * You should have received a copy of the GNU General Public License
8496 + * along with this program; if not, write to the Free Software
8497 + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
8501 + * file and vm operations
8504 +#include <linux/file.h>
8505 +#include <linux/fs_stack.h>
8506 +#include <linux/mm.h>
8507 +#include <linux/security.h>
8510 +/* common function to regular file and dir */
8511 +int aufs_flush(struct file *file, fl_owner_t id)
8514 + aufs_bindex_t bindex, bend;
8515 + struct dentry *dentry;
8516 + struct file *h_file;
8518 + dentry = file->f_dentry;
8519 + si_noflush_read_lock(dentry->d_sb);
8520 + fi_read_lock(file);
8521 + di_read_lock_child(dentry, AuLock_IW);
8524 + bend = au_fbend(file);
8525 + for (bindex = au_fbstart(file); !err && bindex <= bend; bindex++) {
8526 + h_file = au_h_fptr(file, bindex);
8527 + if (!h_file || !h_file->f_op || !h_file->f_op->flush)
8530 + err = h_file->f_op->flush(h_file, id);
8532 + vfsub_update_h_iattr(&h_file->f_path, /*did*/NULL);
8535 + au_cpup_attr_timesizes(dentry->d_inode);
8537 + di_read_unlock(dentry, AuLock_IW);
8538 + fi_read_unlock(file);
8539 + si_read_unlock(dentry->d_sb);
8543 +/* ---------------------------------------------------------------------- */
8545 +int au_do_open_nondir(struct file *file, int flags)
8548 + aufs_bindex_t bindex;
8549 + struct file *h_file;
8550 + struct dentry *dentry;
8551 + struct au_finfo *finfo;
8553 + FiMustWriteLock(file);
8556 + dentry = file->f_dentry;
8557 + finfo = au_fi(file);
8558 + finfo->fi_h_vm_ops = NULL;
8559 + finfo->fi_vm_ops = NULL;
8560 + bindex = au_dbstart(dentry);
8561 + /* O_TRUNC is processed already */
8562 + BUG_ON(au_test_ro(dentry->d_sb, bindex, dentry->d_inode)
8563 + && (flags & O_TRUNC));
8565 + h_file = au_h_open(dentry, bindex, flags, file);
8566 + if (IS_ERR(h_file))
8567 + err = PTR_ERR(h_file);
8569 + au_set_fbstart(file, bindex);
8570 + au_set_fbend(file, bindex);
8571 + au_set_h_fptr(file, bindex, h_file);
8572 + au_update_figen(file);
8573 + /* todo: necessary? */
8574 + /* file->f_ra = h_file->f_ra; */
8579 +static int aufs_open_nondir(struct inode *inode __maybe_unused,
8580 + struct file *file)
8582 + return au_do_open(file, au_do_open_nondir);
8585 +int aufs_release_nondir(struct inode *inode __maybe_unused, struct file *file)
8587 + kfree(au_fi(file)->fi_vm_ops);
8588 + au_finfo_fin(file);
8592 +/* ---------------------------------------------------------------------- */
8594 +static ssize_t aufs_read(struct file *file, char __user *buf, size_t count,
8598 + struct dentry *dentry;
8599 + struct file *h_file;
8600 + struct super_block *sb;
8602 + dentry = file->f_dentry;
8603 + sb = dentry->d_sb;
8604 + si_read_lock(sb, AuLock_FLUSH);
8605 + err = au_reval_and_lock_fdi(file, au_reopen_nondir, /*wlock*/0);
8606 + if (unlikely(err))
8609 + h_file = au_h_fptr(file, au_fbstart(file));
8610 + err = vfsub_read_u(h_file, buf, count, ppos);
8611 + /* todo: necessary? */
8612 + /* file->f_ra = h_file->f_ra; */
8613 + fsstack_copy_attr_atime(dentry->d_inode, h_file->f_dentry->d_inode);
8615 + di_read_unlock(dentry, AuLock_IR);
8616 + fi_read_unlock(file);
8618 + si_read_unlock(sb);
8622 +static ssize_t aufs_write(struct file *file, const char __user *ubuf,
8623 + size_t count, loff_t *ppos)
8626 + aufs_bindex_t bstart;
8627 + struct au_pin pin;
8628 + struct dentry *dentry;
8629 + struct inode *inode;
8630 + struct super_block *sb;
8631 + struct file *h_file;
8632 + char __user *buf = (char __user *)ubuf;
8634 + dentry = file->f_dentry;
8635 + sb = dentry->d_sb;
8636 + inode = dentry->d_inode;
8637 + mutex_lock(&inode->i_mutex);
8638 + si_read_lock(sb, AuLock_FLUSH);
8640 + err = au_reval_and_lock_fdi(file, au_reopen_nondir, /*wlock*/1);
8641 + if (unlikely(err))
8644 + err = au_ready_to_write(file, -1, &pin);
8645 + di_downgrade_lock(dentry, AuLock_IR);
8646 + if (unlikely(err))
8649 + bstart = au_fbstart(file);
8650 + h_file = au_h_fptr(file, bstart);
8652 + err = vfsub_write_u(h_file, buf, count, ppos);
8653 + au_cpup_attr_timesizes(inode);
8654 + inode->i_mode = h_file->f_dentry->d_inode->i_mode;
8657 + di_read_unlock(dentry, AuLock_IR);
8658 + fi_write_unlock(file);
8660 + si_read_unlock(sb);
8661 + mutex_unlock(&inode->i_mutex);
8665 +static ssize_t au_do_aio(struct file *h_file, int rw, struct kiocb *kio,
8666 + const struct iovec *iov, unsigned long nv, loff_t pos)
8669 + struct file *file;
8671 + err = security_file_permission(h_file, rw);
8672 + if (unlikely(err))
8675 + file = kio->ki_filp;
8676 + if (!is_sync_kiocb(kio)) {
8680 + kio->ki_filp = h_file;
8681 + if (rw == MAY_READ)
8682 + err = h_file->f_op->aio_read(kio, iov, nv, pos);
8683 + else if (rw == MAY_WRITE)
8684 + err = h_file->f_op->aio_write(kio, iov, nv, pos);
8687 + /* do not restore kio->ki_filp */
8693 +static ssize_t aufs_aio_read(struct kiocb *kio, const struct iovec *iov,
8694 + unsigned long nv, loff_t pos)
8697 + struct file *file, *h_file;
8698 + struct dentry *dentry;
8699 + struct super_block *sb;
8701 + file = kio->ki_filp;
8702 + dentry = file->f_dentry;
8703 + sb = dentry->d_sb;
8704 + si_read_lock(sb, AuLock_FLUSH);
8705 + err = au_reval_and_lock_fdi(file, au_reopen_nondir, /*wlock*/0);
8706 + if (unlikely(err))
8710 + h_file = au_h_fptr(file, au_fbstart(file));
8711 + if (h_file->f_op && h_file->f_op->aio_read) {
8712 + err = au_do_aio(h_file, MAY_READ, kio, iov, nv, pos);
8713 + /* todo: necessary? */
8714 + /* file->f_ra = h_file->f_ra; */
8715 + fsstack_copy_attr_atime(dentry->d_inode,
8716 + h_file->f_dentry->d_inode);
8718 + /* currently there is no such fs */
8719 + WARN_ON_ONCE(h_file->f_op && h_file->f_op->read);
8721 + di_read_unlock(dentry, AuLock_IR);
8722 + fi_read_unlock(file);
8725 + si_read_unlock(sb);
8729 +static ssize_t aufs_aio_write(struct kiocb *kio, const struct iovec *iov,
8730 + unsigned long nv, loff_t pos)
8733 + struct au_pin pin;
8734 + struct dentry *dentry;
8735 + struct inode *inode;
8736 + struct super_block *sb;
8737 + struct file *file, *h_file;
8739 + file = kio->ki_filp;
8740 + dentry = file->f_dentry;
8741 + sb = dentry->d_sb;
8742 + inode = dentry->d_inode;
8743 + mutex_lock(&inode->i_mutex);
8744 + si_read_lock(sb, AuLock_FLUSH);
8746 + err = au_reval_and_lock_fdi(file, au_reopen_nondir, /*wlock*/1);
8747 + if (unlikely(err))
8750 + err = au_ready_to_write(file, -1, &pin);
8751 + di_downgrade_lock(dentry, AuLock_IR);
8752 + if (unlikely(err))
8756 + h_file = au_h_fptr(file, au_fbstart(file));
8758 + if (h_file->f_op && h_file->f_op->aio_write) {
8759 + err = au_do_aio(h_file, MAY_WRITE, kio, iov, nv, pos);
8760 + au_cpup_attr_timesizes(inode);
8761 + inode->i_mode = h_file->f_dentry->d_inode->i_mode;
8763 + /* currently there is no such fs */
8764 + WARN_ON_ONCE(h_file->f_op && h_file->f_op->write);
8767 + di_read_unlock(dentry, AuLock_IR);
8768 + fi_write_unlock(file);
8770 + si_read_unlock(sb);
8771 + mutex_unlock(&inode->i_mutex);
8775 +static ssize_t aufs_splice_read(struct file *file, loff_t *ppos,
8776 + struct pipe_inode_info *pipe, size_t len,
8777 + unsigned int flags)
8780 + struct file *h_file;
8781 + struct dentry *dentry;
8782 + struct super_block *sb;
8784 + dentry = file->f_dentry;
8785 + sb = dentry->d_sb;
8786 + si_read_lock(sb, AuLock_FLUSH);
8787 + err = au_reval_and_lock_fdi(file, au_reopen_nondir, /*wlock*/0);
8788 + if (unlikely(err))
8792 + h_file = au_h_fptr(file, au_fbstart(file));
8793 + if (au_test_loopback_kthread()) {
8794 + file->f_mapping = h_file->f_mapping;
8795 + smp_mb(); /* unnecessary? */
8797 + err = vfsub_splice_to(h_file, ppos, pipe, len, flags);
8798 + /* todo: necessasry? */
8799 + /* file->f_ra = h_file->f_ra; */
8800 + fsstack_copy_attr_atime(dentry->d_inode, h_file->f_dentry->d_inode);
8802 + di_read_unlock(dentry, AuLock_IR);
8803 + fi_read_unlock(file);
8806 + si_read_unlock(sb);
8811 +aufs_splice_write(struct pipe_inode_info *pipe, struct file *file, loff_t *ppos,
8812 + size_t len, unsigned int flags)
8815 + struct au_pin pin;
8816 + struct dentry *dentry;
8817 + struct inode *inode;
8818 + struct super_block *sb;
8819 + struct file *h_file;
8821 + dentry = file->f_dentry;
8822 + inode = dentry->d_inode;
8823 + mutex_lock(&inode->i_mutex);
8824 + sb = dentry->d_sb;
8825 + si_read_lock(sb, AuLock_FLUSH);
8827 + err = au_reval_and_lock_fdi(file, au_reopen_nondir, /*wlock*/1);
8828 + if (unlikely(err))
8831 + err = au_ready_to_write(file, -1, &pin);
8832 + di_downgrade_lock(dentry, AuLock_IR);
8833 + if (unlikely(err))
8836 + h_file = au_h_fptr(file, au_fbstart(file));
8838 + err = vfsub_splice_from(pipe, h_file, ppos, len, flags);
8839 + au_cpup_attr_timesizes(inode);
8840 + inode->i_mode = h_file->f_dentry->d_inode->i_mode;
8843 + di_read_unlock(dentry, AuLock_IR);
8844 + fi_write_unlock(file);
8846 + si_read_unlock(sb);
8847 + mutex_unlock(&inode->i_mutex);
8851 +/* ---------------------------------------------------------------------- */
8853 +static struct file *au_safe_file(struct vm_area_struct *vma)
8855 + struct file *file;
8857 + file = vma->vm_file;
8858 + if (file->private_data && au_test_aufs(file->f_dentry->d_sb))
8863 +static void au_reset_file(struct vm_area_struct *vma, struct file *file)
8865 + vma->vm_file = file;
8866 + /* smp_mb(); */ /* flush vm_file */
8869 +static int aufs_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
8872 + static DECLARE_WAIT_QUEUE_HEAD(wq);
8873 + struct file *file, *h_file;
8874 + struct au_finfo *finfo;
8876 + /* todo: non-robr mode, user vm_file as it is? */
8877 + wait_event(wq, (file = au_safe_file(vma)));
8879 + /* do not revalidate, no si lock */
8880 + finfo = au_fi(file);
8881 + h_file = finfo->fi_hfile[0 + finfo->fi_bstart].hf_file;
8882 + AuDebugOn(!h_file || !finfo->fi_h_vm_ops);
8884 + mutex_lock(&finfo->fi_vm_mtx);
8885 + vma->vm_file = h_file;
8886 + err = finfo->fi_h_vm_ops->fault(vma, vmf);
8887 + /* todo: necessary? */
8888 + /* file->f_ra = h_file->f_ra; */
8889 + au_reset_file(vma, file);
8890 + mutex_unlock(&finfo->fi_vm_mtx);
8891 +#if 0 /* def CONFIG_SMP */
8892 + /* wake_up_nr(&wq, online_cpu - 1); */
8901 +static int aufs_page_mkwrite(struct vm_area_struct *vma, struct page *page)
8904 + static DECLARE_WAIT_QUEUE_HEAD(wq);
8905 + struct file *file, *h_file;
8906 + struct au_finfo *finfo;
8908 + wait_event(wq, (file = au_safe_file(vma)));
8910 + finfo = au_fi(file);
8911 + h_file = finfo->fi_hfile[0 + finfo->fi_bstart].hf_file;
8912 + AuDebugOn(!h_file || !finfo->fi_h_vm_ops);
8914 + mutex_lock(&finfo->fi_vm_mtx);
8915 + vma->vm_file = h_file;
8916 + err = finfo->fi_h_vm_ops->page_mkwrite(vma, page);
8917 + au_reset_file(vma, file);
8918 + mutex_unlock(&finfo->fi_vm_mtx);
8924 +static void aufs_vm_close(struct vm_area_struct *vma)
8926 + static DECLARE_WAIT_QUEUE_HEAD(wq);
8927 + struct file *file, *h_file;
8928 + struct au_finfo *finfo;
8930 + wait_event(wq, (file = au_safe_file(vma)));
8932 + finfo = au_fi(file);
8933 + h_file = finfo->fi_hfile[0 + finfo->fi_bstart].hf_file;
8934 + AuDebugOn(!h_file || !finfo->fi_h_vm_ops);
8936 + mutex_lock(&finfo->fi_vm_mtx);
8937 + vma->vm_file = h_file;
8938 + finfo->fi_h_vm_ops->close(vma);
8939 + au_reset_file(vma, file);
8940 + mutex_unlock(&finfo->fi_vm_mtx);
8944 +static struct vm_operations_struct aufs_vm_ops = {
8945 + /* .close and .page_mkwrite are not set by default */
8946 + .fault = aufs_fault,
8949 +/* ---------------------------------------------------------------------- */
8951 +static struct vm_operations_struct *au_vm_ops(struct file *h_file,
8952 + struct vm_area_struct *vma)
8954 + struct vm_operations_struct *vm_ops;
8957 + /* todo: call security_file_mmap() here */
8959 + vm_ops = ERR_PTR(-ENODEV);
8960 + if (!h_file->f_op || !h_file->f_op->mmap)
8963 + err = h_file->f_op->mmap(h_file, vma);
8964 + vm_ops = ERR_PTR(err);
8965 + if (unlikely(err))
8968 + vm_ops = vma->vm_ops;
8969 + err = do_munmap(current->mm, vma->vm_start,
8970 + vma->vm_end - vma->vm_start);
8971 + if (unlikely(err)) {
8972 + AuIOErr("failed internal unmapping %.*s, %d\n",
8973 + AuDLNPair(h_file->f_dentry), err);
8974 + vm_ops = ERR_PTR(-EIO);
8981 +static int au_custom_vm_ops(struct au_finfo *finfo, struct vm_area_struct *vma)
8984 + struct vm_operations_struct *h_ops;
8986 + AuRwMustAnyLock(&finfo->fi_rwsem);
8989 + h_ops = finfo->fi_h_vm_ops;
8990 + AuDebugOn(!h_ops);
8991 + if ((!h_ops->page_mkwrite && !h_ops->close)
8992 + || finfo->fi_vm_ops)
8996 + finfo->fi_vm_ops = kmemdup(&aufs_vm_ops, sizeof(aufs_vm_ops), GFP_NOFS);
8997 + if (unlikely(!finfo->fi_vm_ops))
9001 + if (h_ops->page_mkwrite)
9002 + finfo->fi_vm_ops->page_mkwrite = aufs_page_mkwrite;
9004 + finfo->fi_vm_ops->close = aufs_vm_close;
9006 + vma->vm_ops = finfo->fi_vm_ops;
9012 +static int aufs_mmap(struct file *file, struct vm_area_struct *vma)
9015 + unsigned char wlock, mmapped;
9016 + struct dentry *dentry;
9017 + struct super_block *sb;
9018 + struct file *h_file;
9019 + struct vm_operations_struct *vm_ops;
9021 + dentry = file->f_dentry;
9022 + wlock = !!(file->f_mode & FMODE_WRITE) && (vma->vm_flags & VM_SHARED);
9023 + sb = dentry->d_sb;
9024 + si_read_lock(sb, AuLock_FLUSH);
9025 + err = au_reval_and_lock_fdi(file, au_reopen_nondir, /*wlock*/1);
9026 + if (unlikely(err))
9029 + mmapped = !!au_test_mmapped(file);
9031 + struct au_pin pin;
9033 + err = au_ready_to_write(file, -1, &pin);
9034 + di_downgrade_lock(dentry, AuLock_IR);
9035 + if (unlikely(err))
9039 + di_downgrade_lock(dentry, AuLock_IR);
9041 + h_file = au_h_fptr(file, au_fbstart(file));
9042 + if (!mmapped && au_test_fs_bad_mapping(h_file->f_dentry->d_sb)) {
9044 + * by this assignment, f_mapping will differs from aufs inode
9046 + * if someone else mixes the use of f_dentry->d_inode and
9047 + * f_mapping->host, then a problem may arise.
9049 + file->f_mapping = h_file->f_mapping;
9054 + vm_ops = au_vm_ops(h_file, vma);
9055 + err = PTR_ERR(vm_ops);
9056 + if (IS_ERR(vm_ops))
9061 + * unnecessary to handle MAP_DENYWRITE and deny_write_access()?
9062 + * currently MAP_DENYWRITE from userspace is ignored, but elf loader
9063 + * sets it. when FMODE_EXEC is set (by open_exec() or sys_uselib()),
9064 + * both of the aufs file and the lower file is deny_write_access()-ed.
9065 + * finally I hope we can skip handlling MAP_DENYWRITE here.
9067 + err = generic_file_mmap(file, vma);
9068 + if (unlikely(err))
9071 + vma->vm_ops = &aufs_vm_ops;
9073 + struct au_finfo *finfo = au_fi(file);
9075 + finfo->fi_h_vm_ops = vm_ops;
9076 + mutex_init(&finfo->fi_vm_mtx);
9079 + err = au_custom_vm_ops(au_fi(file), vma);
9080 + if (unlikely(err))
9083 + vfsub_file_accessed(h_file);
9084 + fsstack_copy_attr_atime(dentry->d_inode, h_file->f_dentry->d_inode);
9087 + di_read_unlock(dentry, AuLock_IR);
9088 + fi_write_unlock(file);
9090 + si_read_unlock(sb);
9094 +/* ---------------------------------------------------------------------- */
9096 +static int aufs_fsync_nondir(struct file *file, struct dentry *dentry,
9100 + struct au_pin pin;
9101 + struct inode *inode;
9102 + struct file *h_file;
9103 + struct super_block *sb;
9105 + inode = dentry->d_inode;
9106 + IMustLock(file->f_mapping->host);
9107 + if (inode != file->f_mapping->host) {
9108 + mutex_unlock(&file->f_mapping->host->i_mutex);
9109 + mutex_lock(&inode->i_mutex);
9113 + sb = dentry->d_sb;
9114 + si_read_lock(sb, AuLock_FLUSH);
9116 + err = 0; /* -EBADF; */ /* posix? */
9117 + if (unlikely(!(file->f_mode & FMODE_WRITE)))
9119 + err = au_reval_and_lock_fdi(file, au_reopen_nondir, /*wlock*/1);
9120 + if (unlikely(err))
9123 + err = au_ready_to_write(file, -1, &pin);
9124 + di_downgrade_lock(dentry, AuLock_IR);
9125 + if (unlikely(err))
9130 + h_file = au_h_fptr(file, au_fbstart(file));
9131 + if (h_file->f_op && h_file->f_op->fsync) {
9132 + struct dentry *h_d;
9133 + struct mutex *h_mtx;
9136 + * no filemap_fdatawrite() since aufs file has no its own
9137 + * mapping, but dir.
9139 + h_d = h_file->f_dentry;
9140 + h_mtx = &h_d->d_inode->i_mutex;
9141 + mutex_lock_nested(h_mtx, AuLsc_I_CHILD);
9142 + err = h_file->f_op->fsync(h_file, h_d, datasync);
9144 + vfsub_update_h_iattr(&h_file->f_path, /*did*/NULL);
9146 + au_cpup_attr_timesizes(inode);
9147 + mutex_unlock(h_mtx);
9151 + di_read_unlock(dentry, AuLock_IR);
9152 + fi_write_unlock(file);
9154 + si_read_unlock(sb);
9155 + if (inode != file->f_mapping->host) {
9156 + mutex_unlock(&inode->i_mutex);
9157 + mutex_lock(&file->f_mapping->host->i_mutex);
9162 +/* no one supports this operation, currently */
9164 +static int aufs_aio_fsync_nondir(struct kiocb *kio, int datasync)
9167 + struct au_pin pin;
9168 + struct dentry *dentry;
9169 + struct inode *inode;
9170 + struct file *file, *h_file;
9171 + struct super_block *sb;
9173 + file = kio->ki_filp;
9174 + dentry = file->f_dentry;
9175 + inode = dentry->d_inode;
9176 + mutex_lock(&inode->i_mutex);
9178 + sb = dentry->d_sb;
9179 + si_read_lock(sb, AuLock_FLUSH);
9181 + err = 0; /* -EBADF; */ /* posix? */
9182 + if (unlikely(!(file->f_mode & FMODE_WRITE)))
9184 + err = au_reval_and_lock_fdi(file, au_reopen_nondir, /*wlock*/1);
9185 + if (unlikely(err))
9188 + err = au_ready_to_write(file, -1, &pin);
9189 + di_downgrade_lock(dentry, AuLock_IR);
9190 + if (unlikely(err))
9195 + h_file = au_h_fptr(file, au_fbstart(file));
9196 + if (h_file->f_op && h_file->f_op->aio_fsync) {
9197 + struct dentry *h_d;
9198 + struct mutex *h_mtx;
9200 + h_d = h_file->f_dentry;
9201 + h_mtx = &h_d->d_inode->i_mutex;
9202 + if (!is_sync_kiocb(kio)) {
9206 + kio->ki_filp = h_file;
9207 + err = h_file->f_op->aio_fsync(kio, datasync);
9208 + mutex_lock_nested(h_mtx, AuLsc_I_CHILD);
9210 + vfsub_update_h_iattr(&h_file->f_path, /*did*/NULL);
9212 + au_cpup_attr_timesizes(inode);
9213 + mutex_unlock(h_mtx);
9217 + di_read_unlock(dentry, AuLock_IR);
9218 + fi_write_unlock(file);
9220 + si_read_unlock(sb);
9221 + mutex_unlock(&inode->i_mutex);
9226 +static int aufs_fasync(int fd, struct file *file, int flag)
9229 + struct file *h_file;
9230 + struct dentry *dentry;
9231 + struct super_block *sb;
9233 + dentry = file->f_dentry;
9234 + sb = dentry->d_sb;
9235 + si_read_lock(sb, AuLock_FLUSH);
9236 + err = au_reval_and_lock_fdi(file, au_reopen_nondir, /*wlock*/0);
9237 + if (unlikely(err))
9240 + h_file = au_h_fptr(file, au_fbstart(file));
9241 + if (h_file->f_op && h_file->f_op->fasync)
9242 + err = h_file->f_op->fasync(fd, h_file, flag);
9244 + di_read_unlock(dentry, AuLock_IR);
9245 + fi_read_unlock(file);
9248 + si_read_unlock(sb);
9252 +/* ---------------------------------------------------------------------- */
9254 +/* no one supports this operation, currently */
9256 +static ssize_t aufs_sendpage(struct file *file, struct page *page, int offset,
9257 + size_t len, loff_t *pos , int more)
9262 +/* ---------------------------------------------------------------------- */
9264 +struct file_operations aufs_file_fop = {
9266 + * while generic_file_llseek/_unlocked() don't use BKL,
9267 + * don't use it since it operates file->f_mapping->host.
9268 + * in aufs, it may be a real file and may confuse users by UDBA.
9270 + /* .llseek = generic_file_llseek, */
9272 + .read = aufs_read,
9273 + .write = aufs_write,
9274 + .aio_read = aufs_aio_read,
9275 + .aio_write = aufs_aio_write,
9276 + .unlocked_ioctl = aufs_ioctl_nondir,
9277 + .mmap = aufs_mmap,
9278 + .open = aufs_open_nondir,
9279 + .flush = aufs_flush,
9280 + .release = aufs_release_nondir,
9281 + .fsync = aufs_fsync_nondir,
9282 + /* .aio_fsync = aufs_aio_fsync_nondir, */
9283 + .fasync = aufs_fasync,
9284 + /* .sendpage = aufs_sendpage, */
9285 + .splice_write = aufs_splice_write,
9286 + .splice_read = aufs_splice_read,
9288 + .aio_splice_write = aufs_aio_splice_write,
9289 + .aio_splice_read = aufs_aio_splice_read
9292 diff --git a/fs/aufs/f_op_sp.c b/fs/aufs/f_op_sp.c
9293 new file mode 100644
9294 index 0000000..03fddc0
9296 +++ b/fs/aufs/f_op_sp.c
9299 + * Copyright (C) 2005-2009 Junjiro R. Okajima
9301 + * This program, aufs is free software; you can redistribute it and/or modify
9302 + * it under the terms of the GNU General Public License as published by
9303 + * the Free Software Foundation; either version 2 of the License, or
9304 + * (at your option) any later version.
9306 + * This program is distributed in the hope that it will be useful,
9307 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
9308 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
9309 + * GNU General Public License for more details.
9311 + * You should have received a copy of the GNU General Public License
9312 + * along with this program; if not, write to the Free Software
9313 + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
9317 + * file operations for special files.
9318 + * while they exist in aufs virtually,
9319 + * their file I/O is handled out of aufs.
9322 +#include <linux/fs_stack.h>
9325 +static ssize_t aufs_aio_read_sp(struct kiocb *kio, const struct iovec *iov,
9326 + unsigned long nv, loff_t pos)
9329 + aufs_bindex_t bstart;
9330 + unsigned char wbr;
9331 + struct file *file, *h_file;
9332 + struct super_block *sb;
9334 + file = kio->ki_filp;
9335 + sb = file->f_dentry->d_sb;
9336 + si_read_lock(sb, AuLock_FLUSH);
9337 + fi_read_lock(file);
9338 + bstart = au_fbstart(file);
9339 + h_file = au_h_fptr(file, bstart);
9340 + fi_read_unlock(file);
9341 + wbr = !!au_br_writable(au_sbr(sb, bstart)->br_perm);
9342 + si_read_unlock(sb);
9344 + /* do not change the file in kio */
9345 + AuDebugOn(!h_file->f_op || !h_file->f_op->aio_read);
9346 + err = h_file->f_op->aio_read(kio, iov, nv, pos);
9347 + if (err > 0 && wbr)
9348 + file_accessed(h_file);
9353 +static ssize_t aufs_aio_write_sp(struct kiocb *kio, const struct iovec *iov,
9354 + unsigned long nv, loff_t pos)
9357 + aufs_bindex_t bstart;
9358 + unsigned char wbr;
9359 + struct super_block *sb;
9360 + struct file *file, *h_file;
9362 + file = kio->ki_filp;
9363 + sb = file->f_dentry->d_sb;
9364 + si_read_lock(sb, AuLock_FLUSH);
9365 + fi_read_lock(file);
9366 + bstart = au_fbstart(file);
9367 + h_file = au_h_fptr(file, bstart);
9368 + fi_read_unlock(file);
9369 + wbr = !!au_br_writable(au_sbr(sb, bstart)->br_perm);
9370 + si_read_unlock(sb);
9372 + /* do not change the file in kio */
9373 + AuDebugOn(!h_file->f_op || !h_file->f_op->aio_write);
9374 + err = h_file->f_op->aio_write(kio, iov, nv, pos);
9375 + if (err > 0 && wbr)
9376 + file_update_time(h_file);
9381 +/* ---------------------------------------------------------------------- */
9383 +static int aufs_release_sp(struct inode *inode, struct file *file)
9386 + struct file *h_file;
9388 + fi_read_lock(file);
9389 + h_file = au_h_fptr(file, au_fbstart(file));
9390 + fi_read_unlock(file);
9391 + /* close this fifo in aufs */
9392 + err = h_file->f_op->release(inode, file); /* ignore */
9393 + aufs_release_nondir(inode, file); /* ignore */
9397 +/* ---------------------------------------------------------------------- */
9399 +/* currently, support only FIFO */
9400 +enum {AuSp_FIFO, AuSp_FIFO_R, AuSp_FIFO_W, AuSp_FIFO_RW,
9401 + /* AuSp_SOCK, AuSp_CHR, AuSp_BLK, */
9403 +static int aufs_open_sp(struct inode *inode, struct file *file);
9404 +static struct au_sp_fop {
9406 + struct file_operations fop; /* not 'const' */
9408 +} au_sp_fop[AuSp_Last] = {
9411 + .open = aufs_open_sp
9416 +static void au_init_fop_sp(struct file *file)
9418 + struct au_sp_fop *p;
9420 + struct file *h_file;
9423 + if (unlikely(!p->done)) {
9424 + /* initialize first time only */
9425 + static DEFINE_SPINLOCK(spin);
9429 + BUILD_BUG_ON(sizeof(au_sp_fop)/sizeof(*au_sp_fop)
9431 + for (i = 0; i < AuSp_Last; i++)
9432 + spin_lock_init(&p[i].spin);
9435 + spin_unlock(&spin);
9438 + switch (file->f_mode & (FMODE_READ | FMODE_WRITE)) {
9445 + case FMODE_READ | FMODE_WRITE:
9453 + if (unlikely(!p->done)) {
9454 + /* initialize first time only */
9455 + h_file = au_h_fptr(file, au_fbstart(file));
9456 + spin_lock(&p->spin);
9458 + p->fop = *h_file->f_op;
9459 + if (p->fop.aio_read)
9460 + p->fop.aio_read = aufs_aio_read_sp;
9461 + if (p->fop.aio_write)
9462 + p->fop.aio_write = aufs_aio_write_sp;
9463 + p->fop.release = aufs_release_sp;
9466 + spin_unlock(&p->spin);
9468 + file->f_op = &p->fop;
9471 +static int au_cpup_sp(struct dentry *dentry)
9474 + aufs_bindex_t bcpup;
9475 + struct au_pin pin;
9476 + struct au_wr_dir_args wr_dir_args = {
9481 + AuDbg("%.*s\n", AuDLNPair(dentry));
9483 + di_read_unlock(dentry, AuLock_IR);
9484 + di_write_lock_child(dentry);
9485 + err = au_wr_dir(dentry, /*src_dentry*/NULL, &wr_dir_args);
9486 + if (unlikely(err < 0))
9490 + if (bcpup == au_dbstart(dentry))
9491 + goto out; /* success */
9493 + err = au_pin(&pin, dentry, bcpup, au_opt_udba(dentry->d_sb),
9496 + err = au_sio_cpup_simple(dentry, bcpup, -1, AuCpup_DTIME);
9501 + di_downgrade_lock(dentry, AuLock_IR);
9505 +static int au_do_open_sp(struct file *file, int flags)
9508 + struct dentry *dentry;
9509 + struct super_block *sb;
9510 + struct file *h_file;
9511 + struct inode *h_inode;
9513 + dentry = file->f_dentry;
9514 + AuDbg("%.*s\n", AuDLNPair(dentry));
9518 + * operate on the ro branch is not an error.
9520 + au_cpup_sp(dentry); /* ignore */
9522 + /* prepare h_file */
9523 + err = au_do_open_nondir(file, file->f_flags);
9524 + if (unlikely(err))
9527 + sb = dentry->d_sb;
9528 + h_file = au_h_fptr(file, au_fbstart(file));
9529 + h_inode = h_file->f_dentry->d_inode;
9530 + di_read_unlock(dentry, AuLock_IR);
9531 + fi_write_unlock(file);
9532 + si_read_unlock(sb);
9533 + /* open this fifo in aufs */
9534 + err = h_inode->i_fop->open(file->f_dentry->d_inode, file);
9535 + si_noflush_read_lock(sb);
9536 + fi_write_lock(file);
9537 + di_read_lock_child(dentry, AuLock_IR);
9539 + au_init_fop_sp(file);
9541 + au_finfo_fin(file);
9547 +static int aufs_open_sp(struct inode *inode, struct file *file)
9549 + return au_do_open(file, au_do_open_sp);
9552 +/* ---------------------------------------------------------------------- */
9554 +void au_init_special_fop(struct inode *inode, umode_t mode, dev_t rdev)
9556 + init_special_inode(inode, mode, rdev);
9558 + switch (mode & S_IFMT) {
9560 + inode->i_fop = &au_sp_fop[AuSp_FIFO].fop;
9571 +int au_special_file(umode_t mode)
9576 + switch (mode & S_IFMT) {
9588 diff --git a/fs/aufs/file.c b/fs/aufs/file.c
9589 new file mode 100644
9590 index 0000000..cc24802
9592 +++ b/fs/aufs/file.c
9595 + * Copyright (C) 2005-2009 Junjiro R. Okajima
9597 + * This program, aufs is free software; you can redistribute it and/or modify
9598 + * it under the terms of the GNU General Public License as published by
9599 + * the Free Software Foundation; either version 2 of the License, or
9600 + * (at your option) any later version.
9602 + * This program is distributed in the hope that it will be useful,
9603 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
9604 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
9605 + * GNU General Public License for more details.
9607 + * You should have received a copy of the GNU General Public License
9608 + * along with this program; if not, write to the Free Software
9609 + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
9613 + * handling file/dir, and address_space operation
9616 +#include <linux/file.h>
9617 +#include <linux/fsnotify.h>
9618 +#include <linux/namei.h>
9619 +#include <linux/pagemap.h>
9623 + * a dirty trick for handling deny_write_access().
9624 + * because FMODE_EXEC flag is not passed to f_op->open(),
9625 + * set it to file->private_data temporary.
9627 +void au_store_oflag(struct nameidata *nd, struct inode *inode)
9630 + /* && !(nd->flags & LOOKUP_CONTINUE) */
9631 + && (nd->flags & LOOKUP_OPEN)
9632 + && (nd->intent.open.flags & FMODE_EXEC)
9634 + && S_ISREG(inode->i_mode)) {
9635 + /* suppress a warning in lp64 */
9636 + unsigned long flags = nd->intent.open.flags;
9637 + nd->intent.open.file->private_data = (void *)flags;
9642 +/* drop flags for writing */
9643 +unsigned int au_file_roflags(unsigned int flags)
9645 + flags &= ~(O_WRONLY | O_RDWR | O_APPEND | O_CREAT | O_TRUNC);
9646 + flags |= O_RDONLY | O_NOATIME;
9650 +/* common functions to regular file and dir */
9651 +struct file *au_h_open(struct dentry *dentry, aufs_bindex_t bindex, int flags,
9652 + struct file *file)
9654 + struct file *h_file;
9655 + struct dentry *h_dentry;
9656 + struct inode *h_inode;
9657 + struct super_block *sb;
9658 + struct au_branch *br;
9661 + /* a race condition can happen between open and unlink/rmdir */
9662 + h_file = ERR_PTR(-ENOENT);
9663 + h_dentry = au_h_dptr(dentry, bindex);
9664 + if (au_test_nfsd(current) && !h_dentry)
9666 + h_inode = h_dentry->d_inode;
9667 + if (au_test_nfsd(current) && !h_inode)
9669 + if (unlikely((!d_unhashed(dentry) && d_unhashed(h_dentry))
9673 + sb = dentry->d_sb;
9674 + br = au_sbr(sb, bindex);
9675 + h_file = ERR_PTR(-EACCES);
9676 + if (file && (file->f_mode & FMODE_EXEC)
9677 + && (br->br_mnt->mnt_flags & MNT_NOEXEC))
9680 + /* drop flags for writing */
9681 + if (au_test_ro(sb, bindex, dentry->d_inode))
9682 + flags = au_file_roflags(flags);
9683 + flags &= ~O_CREAT;
9684 + atomic_inc(&br->br_count);
9685 + if (!au_special_file(h_inode->i_mode))
9686 + h_file = dentry_open(dget(h_dentry), mntget(br->br_mnt), flags);
9688 + /* this block depends upon the configuration */
9689 + di_read_unlock(dentry, AuLock_IR);
9690 + fi_write_unlock(file);
9691 + si_read_unlock(sb);
9692 + h_file = dentry_open(dget(h_dentry), mntget(br->br_mnt), flags);
9693 + si_noflush_read_lock(sb);
9694 + fi_write_lock(file);
9695 + di_read_lock_child(dentry, AuLock_IR);
9697 + if (IS_ERR(h_file))
9700 + if (file && (file->f_mode & FMODE_EXEC)) {
9701 + h_file->f_mode |= FMODE_EXEC;
9702 + err = deny_write_access(h_file);
9703 + if (unlikely(err)) {
9705 + h_file = ERR_PTR(err);
9709 + fsnotify_open(h_dentry);
9710 + goto out; /* success */
9713 + atomic_dec(&br->br_count);
9718 +int au_do_open(struct file *file, int (*open)(struct file *file, int flags))
9721 + struct dentry *dentry;
9722 + struct super_block *sb;
9724 + dentry = file->f_dentry;
9725 + sb = dentry->d_sb;
9726 + si_read_lock(sb, AuLock_FLUSH);
9727 + err = au_finfo_init(file);
9728 + if (unlikely(err))
9731 + di_read_lock_child(dentry, AuLock_IR);
9732 + err = open(file, file->f_flags);
9733 + di_read_unlock(dentry, AuLock_IR);
9735 + fi_write_unlock(file);
9736 + if (unlikely(err))
9737 + au_finfo_fin(file);
9739 + si_read_unlock(sb);
9743 +int au_reopen_nondir(struct file *file)
9746 + aufs_bindex_t bstart, bindex, bend;
9747 + struct dentry *dentry;
9748 + struct file *h_file, *h_file_tmp;
9750 + dentry = file->f_dentry;
9751 + AuDebugOn(au_special_file(dentry->d_inode->i_mode));
9752 + bstart = au_dbstart(dentry);
9753 + h_file_tmp = NULL;
9754 + if (au_fbstart(file) == bstart) {
9755 + h_file = au_h_fptr(file, bstart);
9756 + if (file->f_mode == h_file->f_mode)
9757 + return 0; /* success */
9758 + h_file_tmp = h_file;
9759 + get_file(h_file_tmp);
9760 + au_set_h_fptr(file, bstart, NULL);
9762 + AuDebugOn(au_fbstart(file) < bstart
9763 + || au_fi(file)->fi_hfile[0 + bstart].hf_file);
9765 + h_file = au_h_open(dentry, bstart, file->f_flags & ~O_TRUNC, file);
9766 + err = PTR_ERR(h_file);
9767 + if (IS_ERR(h_file))
9768 + goto out; /* todo: close all? */
9771 + au_set_fbstart(file, bstart);
9772 + au_set_h_fptr(file, bstart, h_file);
9773 + au_update_figen(file);
9774 + /* todo: necessary? */
9775 + /* file->f_ra = h_file->f_ra; */
9777 + /* close lower files */
9778 + bend = au_fbend(file);
9779 + for (bindex = bstart + 1; bindex <= bend; bindex++)
9780 + au_set_h_fptr(file, bindex, NULL);
9781 + au_set_fbend(file, bstart);
9789 +/* ---------------------------------------------------------------------- */
9791 +static int au_reopen_wh(struct file *file, aufs_bindex_t btgt,
9792 + struct dentry *hi_wh)
9795 + aufs_bindex_t bstart;
9796 + struct au_dinfo *dinfo;
9797 + struct dentry *h_dentry;
9799 + dinfo = au_di(file->f_dentry);
9800 + AuRwMustWriteLock(&dinfo->di_rwsem);
9802 + bstart = dinfo->di_bstart;
9803 + dinfo->di_bstart = btgt;
9804 + h_dentry = dinfo->di_hdentry[0 + btgt].hd_dentry;
9805 + dinfo->di_hdentry[0 + btgt].hd_dentry = hi_wh;
9806 + err = au_reopen_nondir(file);
9807 + dinfo->di_hdentry[0 + btgt].hd_dentry = h_dentry;
9808 + dinfo->di_bstart = bstart;
9813 +static int au_ready_to_write_wh(struct file *file, loff_t len,
9814 + aufs_bindex_t bcpup)
9817 + struct inode *inode;
9818 + struct dentry *dentry, *hi_wh;
9819 + struct super_block *sb;
9821 + dentry = file->f_dentry;
9822 + inode = dentry->d_inode;
9823 + hi_wh = au_hi_wh(inode, bcpup);
9825 + err = au_sio_cpup_wh(dentry, bcpup, len, file);
9827 + /* already copied-up after unlink */
9828 + err = au_reopen_wh(file, bcpup, hi_wh);
9830 + sb = dentry->d_sb;
9831 + if (!err && inode->i_nlink > 1 && au_opt_test(au_mntflags(sb), PLINK))
9832 + au_plink_append(inode, bcpup, au_h_dptr(dentry, bcpup));
9838 + * prepare the @file for writing.
9840 +int au_ready_to_write(struct file *file, loff_t len, struct au_pin *pin)
9843 + aufs_bindex_t bstart, bcpup;
9844 + struct dentry *dentry, *parent, *h_dentry;
9845 + struct inode *h_inode, *inode;
9846 + struct super_block *sb;
9848 + dentry = file->f_dentry;
9849 + sb = dentry->d_sb;
9850 + bstart = au_fbstart(file);
9851 + inode = dentry->d_inode;
9852 + AuDebugOn(au_special_file(inode->i_mode));
9853 + err = au_test_ro(sb, bstart, inode);
9854 + if (!err && (au_h_fptr(file, bstart)->f_mode & FMODE_WRITE)) {
9855 + err = au_pin(pin, dentry, bstart, AuOpt_UDBA_NONE, /*flags*/0);
9859 + /* need to cpup */
9860 + parent = dget_parent(dentry);
9861 + di_write_lock_parent(parent);
9862 + err = AuWbrCopyup(au_sbi(sb), dentry);
9864 + if (unlikely(err < 0))
9868 + if (!au_h_dptr(parent, bcpup)) {
9869 + err = au_cpup_dirs(dentry, bcpup);
9870 + if (unlikely(err))
9874 + err = au_pin(pin, dentry, bcpup, AuOpt_UDBA_NONE,
9875 + AuPin_DI_LOCKED | AuPin_MNT_WRITE);
9876 + if (unlikely(err))
9879 + h_dentry = au_h_fptr(file, bstart)->f_dentry;
9880 + h_inode = h_dentry->d_inode;
9881 + mutex_lock_nested(&h_inode->i_mutex, AuLsc_I_CHILD);
9882 + if (d_unhashed(dentry) /* || d_unhashed(h_dentry) */
9883 + /* || !h_inode->i_nlink */) {
9884 + err = au_ready_to_write_wh(file, len, bcpup);
9885 + di_downgrade_lock(parent, AuLock_IR);
9887 + di_downgrade_lock(parent, AuLock_IR);
9888 + if (!au_h_dptr(dentry, bcpup))
9889 + err = au_sio_cpup_simple(dentry, bcpup, len,
9892 + err = au_reopen_nondir(file);
9894 + mutex_unlock(&h_inode->i_mutex);
9897 + au_pin_set_parent_lflag(pin, /*lflag*/0);
9898 + goto out_dput; /* success */
9904 + di_downgrade_lock(parent, AuLock_IR);
9906 + di_read_unlock(parent, AuLock_IR);
9913 +/* ---------------------------------------------------------------------- */
9915 +static int au_file_refresh_by_inode(struct file *file, int *need_reopen)
9918 + aufs_bindex_t bstart;
9919 + struct au_pin pin;
9920 + struct au_finfo *finfo;
9921 + struct dentry *dentry, *parent, *hi_wh;
9922 + struct inode *inode;
9923 + struct super_block *sb;
9925 + FiMustWriteLock(file);
9928 + finfo = au_fi(file);
9929 + dentry = file->f_dentry;
9930 + sb = dentry->d_sb;
9931 + inode = dentry->d_inode;
9932 + bstart = au_ibstart(inode);
9933 + if (bstart == finfo->fi_bstart)
9936 + parent = dget_parent(dentry);
9937 + if (au_test_ro(sb, bstart, inode)) {
9938 + di_read_lock_parent(parent, !AuLock_IR);
9939 + err = AuWbrCopyup(au_sbi(sb), dentry);
9941 + di_read_unlock(parent, !AuLock_IR);
9942 + if (unlikely(err < 0))
9947 + di_read_lock_parent(parent, AuLock_IR);
9948 + hi_wh = au_hi_wh(inode, bstart);
9949 + if (au_opt_test(au_mntflags(sb), PLINK)
9950 + && au_plink_test(inode)
9951 + && !d_unhashed(dentry)) {
9952 + err = au_test_and_cpup_dirs(dentry, bstart);
9953 + if (unlikely(err))
9956 + /* always superio. */
9957 + err = au_pin(&pin, dentry, bstart, AuOpt_UDBA_NONE,
9958 + AuPin_DI_LOCKED | AuPin_MNT_WRITE);
9960 + err = au_sio_cpup_simple(dentry, bstart, -1,
9963 + } else if (hi_wh) {
9964 + /* already copied-up after unlink */
9965 + err = au_reopen_wh(file, bstart, hi_wh);
9970 + di_read_unlock(parent, AuLock_IR);
9977 +static void au_do_refresh_file(struct file *file)
9979 + aufs_bindex_t bindex, bend, new_bindex, brid;
9980 + struct au_hfile *p, tmp, *q;
9981 + struct au_finfo *finfo;
9982 + struct super_block *sb;
9984 + FiMustWriteLock(file);
9986 + sb = file->f_dentry->d_sb;
9987 + finfo = au_fi(file);
9988 + p = finfo->fi_hfile + finfo->fi_bstart;
9989 + brid = p->hf_br->br_id;
9990 + bend = finfo->fi_bend;
9991 + for (bindex = finfo->fi_bstart; bindex <= bend; bindex++, p++) {
9995 + new_bindex = au_br_index(sb, p->hf_br->br_id);
9996 + if (new_bindex == bindex)
9998 + if (new_bindex < 0) {
9999 + au_set_h_fptr(file, bindex, NULL);
10003 + /* swap two lower inode, and loop again */
10004 + q = finfo->fi_hfile + new_bindex;
10008 + if (tmp.hf_file) {
10014 + p = finfo->fi_hfile;
10015 + if (!au_test_mmapped(file) && !d_unhashed(file->f_dentry)) {
10016 + bend = au_sbend(sb);
10017 + for (finfo->fi_bstart = 0; finfo->fi_bstart <= bend;
10018 + finfo->fi_bstart++, p++)
10019 + if (p->hf_file) {
10020 + if (p->hf_file->f_dentry
10021 + && p->hf_file->f_dentry->d_inode)
10024 + au_hfput(p, file);
10027 + bend = au_br_index(sb, brid);
10028 + for (finfo->fi_bstart = 0; finfo->fi_bstart < bend;
10029 + finfo->fi_bstart++, p++)
10031 + au_hfput(p, file);
10032 + bend = au_sbend(sb);
10035 + p = finfo->fi_hfile + bend;
10036 + for (finfo->fi_bend = bend; finfo->fi_bend >= finfo->fi_bstart;
10037 + finfo->fi_bend--, p--)
10038 + if (p->hf_file) {
10039 + if (p->hf_file->f_dentry
10040 + && p->hf_file->f_dentry->d_inode)
10043 + au_hfput(p, file);
10045 + AuDebugOn(finfo->fi_bend < finfo->fi_bstart);
10049 + * after branch manipulating, refresh the file.
10051 +static int refresh_file(struct file *file, int (*reopen)(struct file *file))
10053 + int err, need_reopen;
10054 + struct dentry *dentry;
10055 + aufs_bindex_t bend, bindex;
10057 + dentry = file->f_dentry;
10058 + err = au_fi_realloc(au_fi(file), au_sbend(dentry->d_sb) + 1);
10059 + if (unlikely(err))
10061 + au_do_refresh_file(file);
10065 + if (!au_test_mmapped(file))
10066 + err = au_file_refresh_by_inode(file, &need_reopen);
10067 + if (!err && need_reopen && !d_unhashed(dentry))
10068 + err = reopen(file);
10070 + au_update_figen(file);
10071 + return 0; /* success */
10074 + /* error, close all lower files */
10075 + bend = au_fbend(file);
10076 + for (bindex = au_fbstart(file); bindex <= bend; bindex++)
10077 + au_set_h_fptr(file, bindex, NULL);
10083 +/* common function to regular file and dir */
10084 +int au_reval_and_lock_fdi(struct file *file, int (*reopen)(struct file *file),
10088 + unsigned int sigen, figen;
10089 + aufs_bindex_t bstart;
10090 + unsigned char pseudo_link;
10091 + struct dentry *dentry;
10092 + struct inode *inode;
10095 + dentry = file->f_dentry;
10096 + inode = dentry->d_inode;
10097 + AuDebugOn(au_special_file(inode->i_mode));
10098 + sigen = au_sigen(dentry->d_sb);
10099 + fi_write_lock(file);
10100 + figen = au_figen(file);
10101 + di_write_lock_child(dentry);
10102 + bstart = au_dbstart(dentry);
10103 + pseudo_link = (bstart != au_ibstart(inode));
10104 + if (sigen == figen && !pseudo_link && au_fbstart(file) == bstart) {
10106 + di_downgrade_lock(dentry, AuLock_IR);
10107 + fi_downgrade_lock(file);
10109 + goto out; /* success */
10112 + AuDbg("sigen %d, figen %d\n", sigen, figen);
10113 + if (sigen != au_digen(dentry)
10114 + || sigen != au_iigen(inode)) {
10115 + err = au_reval_dpath(dentry, sigen);
10116 + if (unlikely(err < 0))
10118 + AuDebugOn(au_digen(dentry) != sigen
10119 + || au_iigen(inode) != sigen);
10122 + err = refresh_file(file, reopen);
10125 + di_downgrade_lock(dentry, AuLock_IR);
10126 + fi_downgrade_lock(file);
10129 + di_write_unlock(dentry);
10130 + fi_write_unlock(file);
10137 +/* ---------------------------------------------------------------------- */
10139 +/* cf. aufs_nopage() */
10140 +/* for madvise(2) */
10141 +static int aufs_readpage(struct file *file __maybe_unused, struct page *page)
10143 + unlock_page(page);
10147 +/* they will never be called. */
10148 +#ifdef CONFIG_AUFS_DEBUG
10149 +static int aufs_prepare_write(struct file *file, struct page *page,
10150 + unsigned from, unsigned to)
10151 +{ AuUnsupport(); return 0; }
10152 +static int aufs_commit_write(struct file *file, struct page *page,
10153 + unsigned from, unsigned to)
10154 +{ AuUnsupport(); return 0; }
10155 +static int aufs_write_begin(struct file *file, struct address_space *mapping,
10156 + loff_t pos, unsigned len, unsigned flags,
10157 + struct page **pagep, void **fsdata)
10158 +{ AuUnsupport(); return 0; }
10159 +static int aufs_write_end(struct file *file, struct address_space *mapping,
10160 + loff_t pos, unsigned len, unsigned copied,
10161 + struct page *page, void *fsdata)
10162 +{ AuUnsupport(); return 0; }
10163 +static int aufs_writepage(struct page *page, struct writeback_control *wbc)
10164 +{ AuUnsupport(); return 0; }
10165 +static void aufs_sync_page(struct page *page)
10166 +{ AuUnsupport(); }
10168 +static int aufs_set_page_dirty(struct page *page)
10169 +{ AuUnsupport(); return 0; }
10170 +static void aufs_invalidatepage(struct page *page, unsigned long offset)
10171 +{ AuUnsupport(); }
10172 +static int aufs_releasepage(struct page *page, gfp_t gfp)
10173 +{ AuUnsupport(); return 0; }
10174 +static ssize_t aufs_direct_IO(int rw, struct kiocb *iocb,
10175 + const struct iovec *iov, loff_t offset,
10176 + unsigned long nr_segs)
10177 +{ AuUnsupport(); return 0; }
10178 +static int aufs_get_xip_mem(struct address_space *mapping, pgoff_t pgoff,
10179 + int create, void **kmem, unsigned long *pfn)
10180 +{ AuUnsupport(); return 0; }
10181 +static int aufs_migratepage(struct address_space *mapping, struct page *newpage,
10182 + struct page *page)
10183 +{ AuUnsupport(); return 0; }
10184 +static int aufs_launder_page(struct page *page)
10185 +{ AuUnsupport(); return 0; }
10186 +static int aufs_is_partially_uptodate(struct page *page,
10187 + read_descriptor_t *desc,
10188 + unsigned long from)
10189 +{ AuUnsupport(); return 0; }
10190 +#endif /* CONFIG_AUFS_DEBUG */
10192 +struct address_space_operations aufs_aop = {
10193 + .readpage = aufs_readpage,
10194 +#ifdef CONFIG_AUFS_DEBUG
10195 + .writepage = aufs_writepage,
10196 + .sync_page = aufs_sync_page,
10197 + /* no writepages, because of writepage */
10198 + .set_page_dirty = aufs_set_page_dirty,
10199 + /* no readpages, because of readpage */
10200 + .prepare_write = aufs_prepare_write,
10201 + .commit_write = aufs_commit_write,
10202 + .write_begin = aufs_write_begin,
10203 + .write_end = aufs_write_end,
10204 + /* no bmap, no block device */
10205 + .invalidatepage = aufs_invalidatepage,
10206 + .releasepage = aufs_releasepage,
10207 + .direct_IO = aufs_direct_IO, /* todo */
10208 + .get_xip_mem = aufs_get_xip_mem, /* todo */
10209 + .migratepage = aufs_migratepage,
10210 + .launder_page = aufs_launder_page,
10211 + .is_partially_uptodate = aufs_is_partially_uptodate
10212 +#endif /* CONFIG_AUFS_DEBUG */
10214 diff --git a/fs/aufs/file.h b/fs/aufs/file.h
10215 new file mode 100644
10216 index 0000000..c6626dd
10218 +++ b/fs/aufs/file.h
10221 + * Copyright (C) 2005-2009 Junjiro R. Okajima
10223 + * This program, aufs is free software; you can redistribute it and/or modify
10224 + * it under the terms of the GNU General Public License as published by
10225 + * the Free Software Foundation; either version 2 of the License, or
10226 + * (at your option) any later version.
10228 + * This program is distributed in the hope that it will be useful,
10229 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
10230 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
10231 + * GNU General Public License for more details.
10233 + * You should have received a copy of the GNU General Public License
10234 + * along with this program; if not, write to the Free Software
10235 + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
10239 + * file operations
10242 +#ifndef __AUFS_FILE_H__
10243 +#define __AUFS_FILE_H__
10247 +#include <linux/fs.h>
10248 +#include <linux/aufs_type.h>
10249 +#include "rwsem.h"
10253 + struct file *hf_file;
10254 + struct au_branch *hf_br;
10259 + atomic_t fi_generation;
10261 + struct au_rwsem fi_rwsem;
10262 + struct au_hfile *fi_hfile;
10263 + aufs_bindex_t fi_bstart, fi_bend;
10266 + /* non-dir only */
10268 + struct vm_operations_struct *fi_h_vm_ops;
10269 + struct vm_operations_struct *fi_vm_ops;
10270 + struct mutex fi_vm_mtx;
10275 + struct au_vdir *fi_vdir_cache;
10280 +/* ---------------------------------------------------------------------- */
10283 +extern struct address_space_operations aufs_aop;
10284 +void au_store_oflag(struct nameidata *nd, struct inode *inode);
10285 +unsigned int au_file_roflags(unsigned int flags);
10286 +struct file *au_h_open(struct dentry *dentry, aufs_bindex_t bindex, int flags,
10287 + struct file *file);
10288 +int au_do_open(struct file *file, int (*open)(struct file *file, int flags));
10289 +int au_reopen_nondir(struct file *file);
10291 +int au_ready_to_write(struct file *file, loff_t len, struct au_pin *pin);
10292 +int au_reval_and_lock_fdi(struct file *file, int (*reopen)(struct file *file),
10296 +extern struct file_operations aufs_file_fop;
10297 +int aufs_flush(struct file *file, fl_owner_t id);
10298 +int au_do_open_nondir(struct file *file, int flags);
10299 +int aufs_release_nondir(struct inode *inode __maybe_unused, struct file *file);
10301 +#ifdef CONFIG_AUFS_SP_IATTR
10303 +int au_special_file(umode_t mode);
10304 +void au_init_special_fop(struct inode *inode, umode_t mode, dev_t rdev);
10306 +AuStubInt0(au_special_file, umode_t mode)
10307 +static inline void au_init_special_fop(struct inode *inode, umode_t mode,
10310 + init_special_inode(inode, mode, rdev);
10315 +void au_hfput(struct au_hfile *hf, struct file *file);
10316 +void au_set_h_fptr(struct file *file, aufs_bindex_t bindex,
10317 + struct file *h_file);
10319 +void au_update_figen(struct file *file);
10321 +void au_finfo_fin(struct file *file);
10322 +int au_finfo_init(struct file *file);
10323 +int au_fi_realloc(struct au_finfo *finfo, int nbr);
10326 +long aufs_ioctl_nondir(struct file *file, unsigned int cmd, unsigned long arg);
10328 +/* ---------------------------------------------------------------------- */
10330 +static inline struct au_finfo *au_fi(struct file *file)
10332 + return file->private_data;
10335 +/* ---------------------------------------------------------------------- */
10338 + * fi_read_lock, fi_write_lock,
10339 + * fi_read_unlock, fi_write_unlock, fi_downgrade_lock
10341 +AuSimpleRwsemFuncs(fi, struct file *f, &au_fi(f)->fi_rwsem);
10343 +#define FiMustNoWaiters(f) AuRwMustNoWaiters(&au_fi(f)->fi_rwsem)
10344 +#define FiMustAnyLock(f) AuRwMustAnyLock(&au_fi(f)->fi_rwsem)
10345 +#define FiMustWriteLock(f) AuRwMustWriteLock(&au_fi(f)->fi_rwsem)
10347 +/* ---------------------------------------------------------------------- */
10349 +/* todo: hard/soft set? */
10350 +static inline aufs_bindex_t au_fbstart(struct file *file)
10352 + FiMustAnyLock(file);
10353 + return au_fi(file)->fi_bstart;
10356 +static inline aufs_bindex_t au_fbend(struct file *file)
10358 + FiMustAnyLock(file);
10359 + return au_fi(file)->fi_bend;
10362 +static inline struct au_vdir *au_fvdir_cache(struct file *file)
10364 + FiMustAnyLock(file);
10365 + return au_fi(file)->fi_vdir_cache;
10368 +static inline void au_set_fbstart(struct file *file, aufs_bindex_t bindex)
10370 + FiMustWriteLock(file);
10371 + au_fi(file)->fi_bstart = bindex;
10374 +static inline void au_set_fbend(struct file *file, aufs_bindex_t bindex)
10376 + FiMustWriteLock(file);
10377 + au_fi(file)->fi_bend = bindex;
10380 +static inline void au_set_fvdir_cache(struct file *file,
10381 + struct au_vdir *vdir_cache)
10383 + FiMustWriteLock(file);
10384 + au_fi(file)->fi_vdir_cache = vdir_cache;
10387 +static inline struct file *au_h_fptr(struct file *file, aufs_bindex_t bindex)
10389 + FiMustAnyLock(file);
10390 + return au_fi(file)->fi_hfile[0 + bindex].hf_file;
10393 +/* todo: memory barrier? */
10394 +static inline unsigned int au_figen(struct file *f)
10396 + return atomic_read(&au_fi(f)->fi_generation);
10399 +static inline int au_test_mmapped(struct file *f)
10401 + /* FiMustAnyLock(f); */
10402 + return !!(au_fi(f)->fi_h_vm_ops);
10405 +#endif /* __KERNEL__ */
10406 +#endif /* __AUFS_FILE_H__ */
10407 diff --git a/fs/aufs/finfo.c b/fs/aufs/finfo.c
10408 new file mode 100644
10409 index 0000000..158cd7f
10411 +++ b/fs/aufs/finfo.c
10414 + * Copyright (C) 2005-2009 Junjiro R. Okajima
10416 + * This program, aufs is free software; you can redistribute it and/or modify
10417 + * it under the terms of the GNU General Public License as published by
10418 + * the Free Software Foundation; either version 2 of the License, or
10419 + * (at your option) any later version.
10421 + * This program is distributed in the hope that it will be useful,
10422 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
10423 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
10424 + * GNU General Public License for more details.
10426 + * You should have received a copy of the GNU General Public License
10427 + * along with this program; if not, write to the Free Software
10428 + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
10432 + * file private data
10435 +#include <linux/file.h>
10438 +void au_hfput(struct au_hfile *hf, struct file *file)
10440 + if (file->f_mode & FMODE_EXEC)
10441 + allow_write_access(hf->hf_file);
10442 + fput(hf->hf_file);
10443 + hf->hf_file = NULL;
10444 + atomic_dec_return(&hf->hf_br->br_count);
10445 + hf->hf_br = NULL;
10448 +void au_set_h_fptr(struct file *file, aufs_bindex_t bindex, struct file *val)
10450 + struct au_finfo *finfo = au_fi(file);
10451 + struct au_hfile *hf;
10453 + hf = finfo->fi_hfile + bindex;
10455 + au_hfput(hf, file);
10457 + hf->hf_file = val;
10458 + hf->hf_br = au_sbr(file->f_dentry->d_sb, bindex);
10462 +void au_update_figen(struct file *file)
10464 + atomic_set(&au_fi(file)->fi_generation, au_digen(file->f_dentry));
10465 + /* smp_mb(); */ /* atomic_set */
10468 +/* ---------------------------------------------------------------------- */
10470 +void au_finfo_fin(struct file *file)
10472 + struct au_finfo *finfo;
10473 + aufs_bindex_t bindex, bend;
10475 + finfo = au_fi(file);
10476 + bindex = finfo->fi_bstart;
10477 + if (bindex >= 0) {
10479 + * calls fput() instead of filp_close(),
10480 + * since no dnotify or lock for the lower file.
10482 + bend = finfo->fi_bend;
10483 + for (; bindex <= bend; bindex++)
10484 + au_set_h_fptr(file, bindex, NULL);
10487 + au_dbg_verify_hf(finfo);
10488 + kfree(finfo->fi_hfile);
10489 + AuRwDestroy(&finfo->fi_rwsem);
10490 + au_cache_free_finfo(finfo);
10493 +int au_finfo_init(struct file *file)
10495 + struct au_finfo *finfo;
10496 + struct dentry *dentry;
10497 + unsigned long ul;
10499 + dentry = file->f_dentry;
10500 + finfo = au_cache_alloc_finfo();
10501 + if (unlikely(!finfo))
10504 + finfo->fi_hfile = kcalloc(au_sbend(dentry->d_sb) + 1,
10505 + sizeof(*finfo->fi_hfile), GFP_NOFS);
10506 + if (unlikely(!finfo->fi_hfile))
10509 + au_rw_init_wlock(&finfo->fi_rwsem);
10510 + finfo->fi_bstart = -1;
10511 + finfo->fi_bend = -1;
10512 + atomic_set(&finfo->fi_generation, au_digen(dentry));
10513 + /* smp_mb(); */ /* atomic_set */
10515 + /* cf. au_store_oflag() */
10516 + ul = (unsigned long)file->private_data;
10517 + file->f_mode |= (ul & FMODE_EXEC);
10518 + file->private_data = finfo;
10519 + return 0; /* success */
10522 + au_cache_free_finfo(finfo);
10527 +int au_fi_realloc(struct au_finfo *finfo, int nbr)
10530 + struct au_hfile *hfp;
10533 + sz = sizeof(*hfp) * (finfo->fi_bend + 1);
10535 + sz = sizeof(*hfp);
10536 + hfp = au_kzrealloc(finfo->fi_hfile, sz, sizeof(*hfp) * nbr, GFP_NOFS);
10538 + finfo->fi_hfile = hfp;
10544 diff --git a/fs/aufs/fstype.h b/fs/aufs/fstype.h
10545 new file mode 100644
10546 index 0000000..3f3709f
10548 +++ b/fs/aufs/fstype.h
10551 + * Copyright (C) 2005-2009 Junjiro R. Okajima
10553 + * This program, aufs is free software; you can redistribute it and/or modify
10554 + * it under the terms of the GNU General Public License as published by
10555 + * the Free Software Foundation; either version 2 of the License, or
10556 + * (at your option) any later version.
10558 + * This program is distributed in the hope that it will be useful,
10559 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
10560 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
10561 + * GNU General Public License for more details.
10563 + * You should have received a copy of the GNU General Public License
10564 + * along with this program; if not, write to the Free Software
10565 + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
10569 + * judging filesystem type
10572 +#ifndef __AUFS_FSTYPE_H__
10573 +#define __AUFS_FSTYPE_H__
10577 +#include <linux/cramfs_fs.h>
10578 +#include <linux/fs.h>
10579 +#include <linux/magic.h>
10580 +#include <linux/romfs_fs.h>
10581 +#include <linux/aufs_type.h>
10583 +static inline int au_test_aufs(struct super_block *sb)
10585 + return sb->s_magic == AUFS_SUPER_MAGIC;
10588 +static inline const char *au_sbtype(struct super_block *sb)
10590 + return sb->s_type->name;
10593 +static inline int au_test_iso9660(struct super_block *sb __maybe_unused)
10595 +#if defined(CONFIG_ROMFS_FS) || defined(CONFIG_ROMFS_FS_MODULE)
10596 + return sb->s_magic == ROMFS_MAGIC;
10602 +static inline int au_test_romfs(struct super_block *sb __maybe_unused)
10604 +#if defined(CONFIG_ISO9660_FS) || defined(CONFIG_ISO9660_FS_MODULE)
10605 + return sb->s_magic == ISOFS_SUPER_MAGIC;
10611 +static inline int au_test_cramfs(struct super_block *sb __maybe_unused)
10613 +#if defined(CONFIG_CRAMFS) || defined(CONFIG_CRAMFS_MODULE)
10614 + return sb->s_magic == CRAMFS_MAGIC;
10619 +static inline int au_test_nfs(struct super_block *sb __maybe_unused)
10621 +#if defined(CONFIG_NFS_FS) || defined(CONFIG_NFS_FS_MODULE)
10622 + return sb->s_magic == NFS_SUPER_MAGIC;
10628 +static inline int au_test_fuse(struct super_block *sb __maybe_unused)
10630 +#if defined(CONFIG_FUSE_FS) || defined(CONFIG_FUSE_FS_MODULE)
10631 + return sb->s_magic == FUSE_SUPER_MAGIC;
10637 +static inline int au_test_xfs(struct super_block *sb __maybe_unused)
10639 +#if defined(CONFIG_XFS_FS) || defined(CONFIG_XFS_FS_MODULE)
10640 + return sb->s_magic == XFS_SB_MAGIC;
10646 +static inline int au_test_tmpfs(struct super_block *sb __maybe_unused)
10648 +#ifdef CONFIG_TMPFS
10649 + return sb->s_magic == TMPFS_MAGIC;
10655 +static inline int au_test_ecryptfs(struct super_block *sb __maybe_unused)
10657 +#if defined(CONFIG_ECRYPT_FS) || defined(CONFIG_ECRYPT_FS_MODULE)
10658 + return !strcmp(au_sbtype(sb), "ecryptfs");
10664 +static inline int au_test_smbfs(struct super_block *sb __maybe_unused)
10666 +#if defined(CONFIG_SMB_FS) || defined(CONFIG_SMB_FS_MODULE)
10667 + return sb->s_magic == SMB_SUPER_MAGIC;
10673 +static inline int au_test_ocfs2(struct super_block *sb __maybe_unused)
10675 +#if defined(CONFIG_OCFS2_FS) || defined(CONFIG_OCFS2_FS_MODULE)
10676 + return sb->s_magic == OCFS2_SUPER_MAGIC;
10682 +static inline int au_test_ocfs2_dlmfs(struct super_block *sb __maybe_unused)
10684 +#if defined(CONFIG_OCFS2_FS_O2CB) || defined(CONFIG_OCFS2_FS_O2CB_MODULE)
10685 + return sb->s_magic == DLMFS_MAGIC;
10691 +static inline int au_test_coda(struct super_block *sb __maybe_unused)
10693 +#if defined(CONFIG_CODA_FS) || defined(CONFIG_CODA_FS_MODULE)
10694 + return sb->s_magic == CODA_SUPER_MAGIC;
10700 +static inline int au_test_v9fs(struct super_block *sb __maybe_unused)
10702 +#if defined(CONFIG_9P_FS) || defined(CONFIG_9P_FS_MODULE)
10703 + return sb->s_magic == V9FS_MAGIC;
10709 +static inline int au_test_ext4(struct super_block *sb __maybe_unused)
10711 +#if defined(CONFIG_EXT4DEV_FS) || defined(CONFIG_EXT4DEV_FS_MODULE)
10712 + return sb->s_magic == EXT4_SUPER_MAGIC;
10718 +static inline int au_test_sysv(struct super_block *sb __maybe_unused)
10720 +#if defined(CONFIG_SYSV_FS) || defined(CONFIG_SYSV_FS_MODULE)
10721 + return !strcmp(au_sbtype(sb), "sysv");
10727 +static inline int au_test_ramfs(struct super_block *sb)
10729 + return sb->s_magic == RAMFS_MAGIC;
10732 +static inline int au_test_ubifs(struct super_block *sb __maybe_unused)
10734 +#if defined(CONFIG_UBIFS_FS) || defined(CONFIG_UBIFS_FS_MODULE)
10735 + return sb->s_magic == UBIFS_SUPER_MAGIC;
10741 +static inline int au_test_procfs(struct super_block *sb __maybe_unused)
10743 +#ifdef CONFIG_PROC_FS
10744 + return sb->s_magic == PROC_SUPER_MAGIC;
10750 +static inline int au_test_sysfs(struct super_block *sb __maybe_unused)
10752 +#ifdef CONFIG_SYSFS
10753 + return sb->s_magic == SYSFS_MAGIC;
10759 +static inline int au_test_configfs(struct super_block *sb __maybe_unused)
10761 +#if defined(CONFIG_CONFIGFS_FS) || defined(CONFIG_CONFIGFS_FS_MODULE)
10762 + return sb->s_magic == CONFIGFS_MAGIC;
10768 +static inline int au_test_minix(struct super_block *sb __maybe_unused)
10770 +#if defined(CONFIG_MINIX_FS) || defined(CONFIG_MINIX_FS_MODULE)
10771 + return sb->s_magic == MINIX3_SUPER_MAGIC
10772 + || sb->s_magic == MINIX2_SUPER_MAGIC
10773 + || sb->s_magic == MINIX2_SUPER_MAGIC2
10774 + || sb->s_magic == MINIX_SUPER_MAGIC
10775 + || sb->s_magic == MINIX_SUPER_MAGIC2;
10781 +static inline int au_test_cifs(struct super_block *sb __maybe_unused)
10783 +#if defined(CONFIG_CIFS_FS) || defined(CONFIGCIFS_FS_MODULE)
10784 + return sb->s_magic == CIFS_MAGIC_NUMBER;
10790 +static inline int au_test_fat(struct super_block *sb __maybe_unused)
10792 +#if defined(CONFIG_FAT_FS) || defined(CONFIG_FAT_FS_MODULE)
10793 + return sb->s_magic == MSDOS_SUPER_MAGIC;
10799 +static inline int au_test_msdos(struct super_block *sb)
10801 + return au_test_fat(sb);
10804 +static inline int au_test_vfat(struct super_block *sb)
10806 + return au_test_fat(sb);
10809 +static inline int au_test_debugfs(struct super_block *sb __maybe_unused)
10811 +#ifdef CONFIG_DEBUG_FS
10812 + return sb->s_magic == DEBUGFS_MAGIC;
10818 +/* ---------------------------------------------------------------------- */
10820 + * they can't be an aufs branch.
10822 +static inline int au_test_fs_unsuppoted(struct super_block *sb)
10825 +#ifndef CONFIG_AUFS_BR_RAMFS
10826 + au_test_ramfs(sb) ||
10828 + au_test_procfs(sb)
10829 + || au_test_sysfs(sb)
10830 + || au_test_configfs(sb)
10831 + || au_test_debugfs(sb)
10832 + /* || !strcmp(au_sbtype(sb), "unionfs") */
10833 + || au_test_aufs(sb); /* will be supported in next version */
10837 + * If the filesystem supports NFS-export, then it has to support NULL as
10838 + * a nameidata parameter for ->create(), ->lookup() and ->d_revalidate().
10839 + * We can apply this principle when we handle a lower filesystem.
10841 +static inline int au_test_fs_null_nd(struct super_block *sb)
10843 + return !!sb->s_export_op;
10846 +static inline int au_test_fs_remote(struct super_block *sb)
10848 + return !au_test_tmpfs(sb)
10849 +#ifdef CONFIG_AUFS_BR_RAMFS
10850 + && !au_test_ramfs(sb)
10852 + && !(sb->s_type->fs_flags & FS_REQUIRES_DEV);
10855 +/* ---------------------------------------------------------------------- */
10858 + * Note: these functions (below) are created after reading ->getattr() in all
10859 + * filesystems under linux/fs. it means we have to do so in every update...
10863 + * some filesystems require getattr to refresh the inode attributes before
10865 + * in most cases, we can rely on the inode attribute in NFS (or every remote fs)
10866 + * and leave the work for d_revalidate()
10868 +static inline int au_test_fs_refresh_iattr(struct super_block *sb)
10870 + return au_test_nfs(sb)
10871 + || au_test_fuse(sb)
10872 + /* || au_test_smbfs(sb) */ /* untested */
10873 + /* || au_test_ocfs2(sb) */ /* untested */
10874 + /* || au_test_coda(sb) */ /* untested */
10875 + /* || au_test_v9fs(sb) */ /* untested */
10880 + * filesystems which don't maintain i_size or i_blocks.
10882 +static inline int au_test_fs_bad_iattr_size(struct super_block *sb)
10884 + return au_test_xfs(sb)
10885 + /* || au_test_ext4(sb) */ /* untested */
10886 + /* || au_test_ocfs2(sb) */ /* untested */
10887 + /* || au_test_ocfs2_dlmfs(sb) */ /* untested */
10888 + /* || au_test_sysv(sb) */ /* untested */
10889 + /* || au_test_ubifs(sb) */ /* untested */
10890 + /* || au_test_minix(sb) */ /* untested */
10895 + * filesystems which don't store the correct value in some of their inode
10898 +static inline int au_test_fs_bad_iattr(struct super_block *sb)
10900 + return au_test_fs_bad_iattr_size(sb)
10901 + /* || au_test_cifs(sb) */ /* untested */
10902 + || au_test_fat(sb)
10903 + || au_test_msdos(sb)
10904 + || au_test_vfat(sb);
10907 +/* they don't check i_nlink in link(2) */
10908 +static inline int au_test_fs_no_limit_nlink(struct super_block *sb)
10910 + return au_test_tmpfs(sb)
10911 +#ifdef CONFIG_AUFS_BR_RAMFS
10912 + || au_test_ramfs(sb)
10914 + || au_test_ubifs(sb);
10918 + * filesystems which sets S_NOATIME and S_NOCMTIME.
10920 +static inline int au_test_fs_notime(struct super_block *sb)
10922 + return au_test_nfs(sb)
10923 + || au_test_fuse(sb)
10924 + || au_test_ubifs(sb)
10925 + /* || au_test_cifs(sb) */ /* untested */
10930 + * filesystems which requires replacing i_mapping.
10932 +static inline int au_test_fs_bad_mapping(struct super_block *sb)
10934 + return au_test_fuse(sb)
10935 + || au_test_ubifs(sb);
10938 +/* temporary support for i#1 in cramfs */
10939 +static inline int au_test_fs_unique_ino(struct inode *inode)
10941 + if (au_test_cramfs(inode->i_sb))
10942 + return inode->i_ino != 1;
10946 +/* ---------------------------------------------------------------------- */
10949 + * the filesystem where the xino files placed must support i/o after unlink and
10950 + * maintain i_size and i_blocks.
10952 +static inline int au_test_fs_bad_xino(struct super_block *sb)
10954 + return au_test_fs_remote(sb)
10955 + || au_test_fs_bad_iattr_size(sb)
10956 +#ifdef CONFIG_AUFS_BR_RAMFS
10957 + || !(au_test_ramfs(sb) || au_test_fs_null_nd(sb))
10959 + || !au_test_fs_null_nd(sb) /* to keep xino code simple */
10961 + /* don't want unnecessary work for xino */
10962 + || au_test_aufs(sb)
10963 + || au_test_ecryptfs(sb);
10966 +static inline int au_test_fs_trunc_xino(struct super_block *sb)
10968 + return au_test_tmpfs(sb)
10969 + || au_test_ramfs(sb);
10973 + * test if the @sb is real-readonly.
10975 +static inline int au_test_fs_rr(struct super_block *sb)
10977 + return au_test_iso9660(sb)
10978 + || au_test_cramfs(sb)
10979 + || au_test_romfs(sb);
10982 +#endif /* __KERNEL__ */
10983 +#endif /* __AUFS_FSTYPE_H__ */
10984 diff --git a/fs/aufs/hinotify.c b/fs/aufs/hinotify.c
10985 new file mode 100644
10986 index 0000000..66b761f
10988 +++ b/fs/aufs/hinotify.c
10991 + * Copyright (C) 2005-2009 Junjiro R. Okajima
10993 + * This program, aufs is free software; you can redistribute it and/or modify
10994 + * it under the terms of the GNU General Public License as published by
10995 + * the Free Software Foundation; either version 2 of the License, or
10996 + * (at your option) any later version.
10998 + * This program is distributed in the hope that it will be useful,
10999 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
11000 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11001 + * GNU General Public License for more details.
11003 + * You should have received a copy of the GNU General Public License
11004 + * along with this program; if not, write to the Free Software
11005 + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
11009 + * inotify for the lower directories
11014 +static const __u32 AuHinMask = (IN_MOVE | IN_DELETE | IN_CREATE);
11015 +static struct inotify_handle *au_hin_handle;
11017 +AuCacheFuncs(hinotify, HINOTIFY);
11019 +int au_hin_alloc(struct au_hinode *hinode, struct inode *inode,
11020 + struct inode *h_inode)
11023 + struct au_hinotify *hin;
11027 + hin = au_cache_alloc_hinotify();
11029 + AuDebugOn(hinode->hi_notify);
11030 + hinode->hi_notify = hin;
11031 + hin->hin_aufs_inode = inode;
11033 + inotify_init_watch(&hin->hin_watch);
11034 + wd = inotify_add_watch(au_hin_handle, &hin->hin_watch, h_inode,
11037 + return 0; /* success */
11040 + put_inotify_watch(&hin->hin_watch);
11041 + au_cache_free_hinotify(hin);
11042 + hinode->hi_notify = NULL;
11048 +void au_hin_free(struct au_hinode *hinode)
11051 + struct au_hinotify *hin;
11053 + hin = hinode->hi_notify;
11056 + if (atomic_read(&hin->hin_watch.count))
11057 + err = inotify_rm_watch(au_hin_handle, &hin->hin_watch);
11058 + if (unlikely(err))
11059 + /* it means the watch is already removed */
11060 + AuWarn("failed inotify_rm_watch() %d\n", err);
11061 + au_cache_free_hinotify(hin);
11062 + hinode->hi_notify = NULL;
11066 +/* ---------------------------------------------------------------------- */
11068 +void au_hin_ctl(struct au_hinode *hinode, int do_set)
11070 + struct inode *h_inode;
11071 + struct inotify_watch *watch;
11073 + if (!hinode->hi_notify)
11076 + h_inode = hinode->hi_inode;
11077 + IMustLock(h_inode);
11079 + /* todo: try inotify_find_update_watch()? */
11080 + watch = &hinode->hi_notify->hin_watch;
11081 + mutex_lock(&h_inode->inotify_mutex);
11082 + /* mutex_lock(&watch->ih->mutex); */
11084 + AuDebugOn(watch->mask & AuHinMask);
11085 + watch->mask |= AuHinMask;
11087 + AuDebugOn(!(watch->mask & AuHinMask));
11088 + watch->mask &= ~AuHinMask;
11090 + /* mutex_unlock(&watch->ih->mutex); */
11091 + mutex_unlock(&h_inode->inotify_mutex);
11094 +void au_reset_hinotify(struct inode *inode, unsigned int flags)
11096 + aufs_bindex_t bindex, bend;
11097 + struct inode *hi;
11098 + struct dentry *iwhdentry;
11100 + bend = au_ibend(inode);
11101 + for (bindex = au_ibstart(inode); bindex <= bend; bindex++) {
11102 + hi = au_h_iptr(inode, bindex);
11106 + /* mutex_lock_nested(&hi->i_mutex, AuLsc_I_CHILD); */
11107 + iwhdentry = au_hi_wh(inode, bindex);
11111 + au_set_h_iptr(inode, bindex, NULL, 0);
11112 + au_set_h_iptr(inode, bindex, au_igrab(hi),
11113 + flags & ~AuHi_XINO);
11116 + /* mutex_unlock(&hi->i_mutex); */
11120 +/* ---------------------------------------------------------------------- */
11122 +static int hin_xino(struct inode *inode, struct inode *h_inode)
11125 + aufs_bindex_t bindex, bend, bfound, bstart;
11126 + struct inode *h_i;
11129 + if (unlikely(inode->i_ino == AUFS_ROOT_INO)) {
11130 + AuWarn("branch root dir was changed\n");
11135 + bend = au_ibend(inode);
11136 + bstart = au_ibstart(inode);
11137 +#if 0 /* reserved for future use */
11138 + if (bindex == bend) {
11139 + /* keep this ino in rename case */
11143 + for (bindex = bstart; bindex <= bend; bindex++) {
11144 + if (au_h_iptr(inode, bindex) == h_inode) {
11152 + for (bindex = bstart; bindex <= bend; bindex++) {
11153 + h_i = au_h_iptr(inode, bindex);
11157 + err = au_xino_write(inode->i_sb, bindex, h_i->i_ino, /*ino*/0);
11158 + /* ignore this error */
11159 + /* bad action? */
11162 + /* children inode number will be broken */
11169 +static int hin_gen_tree(struct dentry *dentry)
11171 + int err, i, j, ndentry;
11172 + struct au_dcsub_pages dpages;
11173 + struct au_dpage *dpage;
11174 + struct dentry **dentries;
11176 + err = au_dpages_init(&dpages, GFP_NOFS);
11177 + if (unlikely(err))
11179 + err = au_dcsub_pages(&dpages, dentry, NULL, NULL);
11180 + if (unlikely(err))
11183 + for (i = 0; i < dpages.ndpage; i++) {
11184 + dpage = dpages.dpages + i;
11185 + dentries = dpage->dentries;
11186 + ndentry = dpage->ndentry;
11187 + for (j = 0; j < ndentry; j++) {
11188 + struct dentry *d;
11197 + /* todo: reset children xino?
11198 + cached children only? */
11199 + au_iigen_dec(d->d_inode);
11204 + au_dpages_free(&dpages);
11206 + /* discard children */
11207 + dentry_unhash(dentry);
11214 + * return 0 if processed.
11216 +static int hin_gen_by_inode(char *name, unsigned int nlen, struct inode *inode,
11217 + const unsigned int isdir)
11220 + struct dentry *d;
11221 + struct qstr *dname;
11224 + if (unlikely(inode->i_ino == AUFS_ROOT_INO)) {
11225 + AuWarn("branch root dir was changed\n");
11231 + AuDebugOn(!name);
11232 + au_iigen_dec(inode);
11233 + spin_lock(&dcache_lock);
11234 + list_for_each_entry(d, &inode->i_dentry, d_alias) {
11235 + dname = &d->d_name;
11236 + if (dname->len != nlen
11237 + && memcmp(dname->name, name, nlen))
11240 + spin_lock(&d->d_lock);
11243 + spin_unlock(&d->d_lock);
11246 + spin_unlock(&dcache_lock);
11248 + au_fset_si(au_sbi(inode->i_sb), FAILED_REFRESH_DIRS);
11249 + d = d_find_alias(inode);
11251 + au_iigen_dec(inode);
11255 + dname = &d->d_name;
11256 + if (dname->len == nlen && !memcmp(dname->name, name, nlen))
11257 + err = hin_gen_tree(d);
11266 +static int hin_gen_by_name(struct dentry *dentry, const unsigned int isdir)
11269 + struct inode *inode;
11271 + inode = dentry->d_inode;
11272 + if (IS_ROOT(dentry)
11273 + /* || (inode && inode->i_ino == AUFS_ROOT_INO) */
11275 + AuWarn("branch root dir was changed\n");
11282 + au_digen_dec(dentry);
11284 + au_iigen_dec(inode);
11286 + au_fset_si(au_sbi(dentry->d_sb), FAILED_REFRESH_DIRS);
11288 + err = hin_gen_tree(dentry);
11295 +/* ---------------------------------------------------------------------- */
11297 +/* hinotify job flags */
11298 +#define AuHinJob_XINO0 1
11299 +#define AuHinJob_GEN (1 << 1)
11300 +#define AuHinJob_DIRENT (1 << 2)
11301 +#define AuHinJob_ISDIR (1 << 3)
11302 +#define AuHinJob_TRYXINO0 (1 << 4)
11303 +#define AuHinJob_MNTPNT (1 << 5)
11304 +#define au_ftest_hinjob(flags, name) ((flags) & AuHinJob_##name)
11305 +#define au_fset_hinjob(flags, name) { (flags) |= AuHinJob_##name; }
11306 +#define au_fclr_hinjob(flags, name) { (flags) &= ~AuHinJob_##name; }
11308 +struct hin_job_args {
11309 + unsigned int flags;
11310 + struct inode *inode, *h_inode, *dir, *h_dir;
11311 + struct dentry *dentry;
11316 +static int hin_job(struct hin_job_args *a)
11318 + const unsigned int isdir = au_ftest_hinjob(a->flags, ISDIR);
11321 + if (au_ftest_hinjob(a->flags, XINO0) && a->inode)
11322 + hin_xino(a->inode, a->h_inode); /* ignore this error */
11324 + if (au_ftest_hinjob(a->flags, TRYXINO0)
11327 + mutex_lock_nested(&a->h_inode->i_mutex, AuLsc_I_CHILD);
11328 + if (!a->h_inode->i_nlink)
11329 + hin_xino(a->inode, a->h_inode); /* ignore this error */
11330 + mutex_unlock(&a->h_inode->i_mutex);
11333 + /* make the generation obsolete */
11334 + if (au_ftest_hinjob(a->flags, GEN)) {
11337 + err = hin_gen_by_inode(a->h_name, a->h_nlen, a->inode,
11339 + if (err && a->dentry)
11340 + hin_gen_by_name(a->dentry, isdir);
11341 + /* ignore this error */
11344 + /* make dir entries obsolete */
11345 + if (au_ftest_hinjob(a->flags, DIRENT) && a->inode) {
11346 + struct au_vdir *vdir;
11348 + vdir = au_ivdir(a->inode);
11350 + vdir->vd_jiffy = 0;
11351 + /* IMustLock(a->inode); */
11352 + /* a->inode->i_version++; */
11355 + /* can do nothing but warn */
11356 + if (au_ftest_hinjob(a->flags, MNTPNT)
11358 + && d_mountpoint(a->dentry))
11359 + AuWarn("mount-point %.*s is removed or renamed\n",
11360 + AuDLNPair(a->dentry));
11365 +/* ---------------------------------------------------------------------- */
11367 +static char *in_name(u32 mask)
11369 +#ifdef CONFIG_AUFS_DEBUG
11370 +#define test_ret(flag) if (mask & flag) \
11372 + test_ret(IN_ACCESS);
11373 + test_ret(IN_MODIFY);
11374 + test_ret(IN_ATTRIB);
11375 + test_ret(IN_CLOSE_WRITE);
11376 + test_ret(IN_CLOSE_NOWRITE);
11377 + test_ret(IN_OPEN);
11378 + test_ret(IN_MOVED_FROM);
11379 + test_ret(IN_MOVED_TO);
11380 + test_ret(IN_CREATE);
11381 + test_ret(IN_DELETE);
11382 + test_ret(IN_DELETE_SELF);
11383 + test_ret(IN_MOVE_SELF);
11384 + test_ret(IN_UNMOUNT);
11385 + test_ret(IN_Q_OVERFLOW);
11386 + test_ret(IN_IGNORED);
11394 +static struct dentry *lookup_wlock_by_name(char *name, unsigned int nlen,
11395 + struct inode *dir)
11397 + struct dentry *dentry, *d, *parent;
11398 + struct qstr *dname;
11400 + parent = d_find_alias(dir);
11405 + spin_lock(&dcache_lock);
11406 + list_for_each_entry(d, &parent->d_subdirs, d_u.d_child) {
11407 + /* AuDbg("%.*s\n", AuDLNPair(d)); */
11408 + dname = &d->d_name;
11409 + if (dname->len != nlen || memcmp(dname->name, name, nlen))
11411 + if (!atomic_read(&d->d_count) || !d->d_fsdata) {
11412 + spin_lock(&d->d_lock);
11414 + spin_unlock(&d->d_lock);
11418 + dentry = dget(d);
11421 + spin_unlock(&dcache_lock);
11425 + di_write_lock_child(dentry);
11430 +static struct inode *lookup_wlock_by_ino(struct super_block *sb,
11431 + aufs_bindex_t bindex, ino_t h_ino)
11433 + struct inode *inode;
11438 + err = au_xino_read(sb, bindex, h_ino, &ino);
11440 + inode = ilookup(sb, ino);
11444 + if (unlikely(inode->i_ino == AUFS_ROOT_INO)) {
11445 + AuWarn("wrong root branch\n");
11451 + ii_write_lock_child(inode);
11457 +enum { CHILD, PARENT };
11458 +struct postproc_args {
11459 + struct inode *h_dir, *dir, *h_child_inode;
11461 + unsigned int flags[2];
11462 + unsigned int h_child_nlen;
11463 + char h_child_name[];
11466 +static void postproc(void *_args)
11468 + struct postproc_args *a = _args;
11469 + struct super_block *sb;
11470 + aufs_bindex_t bindex, bend, bfound;
11471 + unsigned char xino, try_iput;
11473 + struct inode *inode;
11475 + struct hin_job_args args;
11476 + struct dentry *dentry;
11477 + struct au_sbinfo *sbinfo;
11479 + AuDebugOn(!_args);
11480 + AuDebugOn(!a->h_dir);
11481 + AuDebugOn(!a->dir);
11482 + AuDebugOn(!a->mask);
11483 + AuDbg("mask 0x%x %s, i%lu, hi%lu, hci%lu\n",
11484 + a->mask, in_name(a->mask), a->dir->i_ino, a->h_dir->i_ino,
11485 + a->h_child_inode ? a->h_child_inode->i_ino : 0);
11490 + * do not lock a->dir->i_mutex here
11491 + * because of d_revalidate() may cause a deadlock.
11493 + sb = a->dir->i_sb;
11495 + sbinfo = au_sbi(sb);
11496 + AuDebugOn(!sbinfo);
11497 + /* big aufs lock */
11498 + si_noflush_write_lock(sb);
11500 + ii_read_lock_parent(a->dir);
11502 + bend = au_ibend(a->dir);
11503 + for (bindex = au_ibstart(a->dir); bindex <= bend; bindex++)
11504 + if (au_h_iptr(a->dir, bindex) == a->h_dir) {
11508 + ii_read_unlock(a->dir);
11509 + if (unlikely(bfound < 0))
11512 + xino = !!au_opt_test(au_mntflags(sb), XINO);
11514 + if (a->h_child_inode)
11515 + h_ino = a->h_child_inode->i_ino;
11517 + if (a->h_child_nlen
11518 + && (au_ftest_hinjob(a->flags[CHILD], GEN)
11519 + || au_ftest_hinjob(a->flags[CHILD], MNTPNT)))
11520 + dentry = lookup_wlock_by_name(a->h_child_name, a->h_child_nlen,
11524 + inode = dentry->d_inode;
11525 + if (xino && !inode && h_ino
11526 + && (au_ftest_hinjob(a->flags[CHILD], XINO0)
11527 + || au_ftest_hinjob(a->flags[CHILD], TRYXINO0)
11528 + || au_ftest_hinjob(a->flags[CHILD], GEN))) {
11529 + inode = lookup_wlock_by_ino(sb, bfound, h_ino);
11533 + args.flags = a->flags[CHILD];
11534 + args.dentry = dentry;
11535 + args.inode = inode;
11536 + args.h_inode = a->h_child_inode;
11537 + args.dir = a->dir;
11538 + args.h_dir = a->h_dir;
11539 + args.h_name = a->h_child_name;
11540 + args.h_nlen = a->h_child_nlen;
11541 + err = hin_job(&args);
11543 + if (dentry->d_fsdata)
11544 + di_write_unlock(dentry);
11547 + if (inode && try_iput) {
11548 + ii_write_unlock(inode);
11552 + ii_write_lock_parent(a->dir);
11553 + args.flags = a->flags[PARENT];
11554 + args.dentry = NULL;
11555 + args.inode = a->dir;
11556 + args.h_inode = a->h_dir;
11558 + args.h_dir = NULL;
11559 + args.h_name = NULL;
11561 + err = hin_job(&args);
11562 + ii_write_unlock(a->dir);
11565 + au_nwt_done(&sbinfo->si_nowait);
11566 + si_write_unlock(sb);
11568 + iput(a->h_child_inode);
11574 +/* ---------------------------------------------------------------------- */
11576 +static void aufs_inotify(struct inotify_watch *watch, u32 wd __maybe_unused,
11577 + u32 mask, u32 cookie __maybe_unused,
11578 + const char *h_child_name, struct inode *h_child_inode)
11580 + struct au_hinotify *hinotify;
11581 + struct postproc_args *args;
11582 + int len, wkq_err;
11583 + unsigned char isdir, isroot, wh;
11585 + struct inode *dir;
11586 + unsigned int flags[2];
11588 + /* if IN_UNMOUNT happens, there must be another bug */
11589 + AuDebugOn(mask & IN_UNMOUNT);
11590 + if (mask & (IN_IGNORED | IN_UNMOUNT)) {
11591 + put_inotify_watch(watch);
11594 +#ifdef AuDbgHinotify
11596 + if (1 || !h_child_name || strcmp(h_child_name, AUFS_XINO_FNAME)) {
11597 + AuDbg("i%lu, wd %d, mask 0x%x %s, cookie 0x%x, hcname %s,"
11599 + watch->inode->i_ino, wd, mask, in_name(mask), cookie,
11600 + h_child_name ? h_child_name : "",
11601 + h_child_inode ? h_child_inode->i_ino : 0);
11607 + hinotify = container_of(watch, struct au_hinotify, hin_watch);
11608 + AuDebugOn(!hinotify || !hinotify->hin_aufs_inode);
11609 + dir = igrab(hinotify->hin_aufs_inode);
11613 + isroot = (dir->i_ino == AUFS_ROOT_INO);
11616 + if (h_child_name) {
11617 + len = strlen(h_child_name);
11618 + if (!memcmp(h_child_name, AUFS_WH_PFX, AUFS_WH_PFX_LEN)) {
11619 + h_child_name += AUFS_WH_PFX_LEN;
11620 + len -= AUFS_WH_PFX_LEN;
11626 + if (h_child_inode)
11627 + isdir = !!S_ISDIR(h_child_inode->i_mode);
11628 + flags[PARENT] = AuHinJob_ISDIR;
11629 + flags[CHILD] = 0;
11631 + flags[CHILD] = AuHinJob_ISDIR;
11632 + switch (mask & IN_ALL_EVENTS) {
11633 + case IN_MOVED_FROM:
11634 + case IN_MOVED_TO:
11635 + AuDebugOn(!h_child_name || !h_child_inode);
11636 + au_fset_hinjob(flags[CHILD], GEN);
11637 + au_fset_hinjob(flags[CHILD], XINO0);
11638 + au_fset_hinjob(flags[CHILD], MNTPNT);
11639 + au_fset_hinjob(flags[PARENT], DIRENT);
11643 + AuDebugOn(!h_child_name || !h_child_inode);
11644 + au_fset_hinjob(flags[PARENT], DIRENT);
11645 + au_fset_hinjob(flags[CHILD], GEN);
11650 + * aufs never be able to get this child inode.
11651 + * revalidation should be in d_revalidate()
11652 + * by checking i_nlink, i_generation or d_unhashed().
11654 + AuDebugOn(!h_child_name);
11655 + au_fset_hinjob(flags[PARENT], DIRENT);
11656 + au_fset_hinjob(flags[CHILD], GEN);
11657 + au_fset_hinjob(flags[CHILD], TRYXINO0);
11658 + au_fset_hinjob(flags[CHILD], MNTPNT);
11666 + h_child_inode = NULL;
11668 + /* iput() and kfree() will be called in postproc() */
11670 + * inotify_mutex is already acquired and kmalloc/prune_icache may lock
11671 + * iprune_mutex. strange.
11674 + args = kmalloc(sizeof(*args) + len + 1, GFP_NOFS);
11676 + if (unlikely(!args)) {
11677 + AuErr1("no memory\n");
11681 + args->flags[PARENT] = flags[PARENT];
11682 + args->flags[CHILD] = flags[CHILD];
11683 + args->mask = mask;
11685 + args->h_dir = igrab(watch->inode);
11686 + if (h_child_inode)
11687 + h_child_inode = igrab(h_child_inode); /* can be NULL */
11688 + args->h_child_inode = h_child_inode;
11689 + args->h_child_nlen = len;
11691 + p = (void *)args;
11692 + p += sizeof(*args);
11693 + memcpy(p, h_child_name, len + 1);
11697 + wkq_err = au_wkq_nowait(postproc, args, dir->i_sb);
11699 + if (unlikely(wkq_err))
11700 + AuErr("wkq %d\n", wkq_err);
11703 +static void aufs_inotify_destroy(struct inotify_watch *watch __maybe_unused)
11708 +static struct inotify_operations aufs_inotify_ops = {
11709 + .handle_event = aufs_inotify,
11710 + .destroy_watch = aufs_inotify_destroy
11713 +/* ---------------------------------------------------------------------- */
11715 +static void au_hin_destroy_cache(void)
11717 + kmem_cache_destroy(au_cachep[AuCache_HINOTIFY]);
11718 + au_cachep[AuCache_HINOTIFY] = NULL;
11721 +int __init au_hinotify_init(void)
11726 + au_cachep[AuCache_HINOTIFY] = AuCache(au_hinotify);
11727 + if (au_cachep[AuCache_HINOTIFY]) {
11729 + au_hin_handle = inotify_init(&aufs_inotify_ops);
11730 + if (IS_ERR(au_hin_handle)) {
11731 + err = PTR_ERR(au_hin_handle);
11732 + au_hin_destroy_cache();
11739 +void au_hinotify_fin(void)
11741 + inotify_destroy(au_hin_handle);
11742 + if (au_cachep[AuCache_HINOTIFY])
11743 + au_hin_destroy_cache();
11745 diff --git a/fs/aufs/i_op.c b/fs/aufs/i_op.c
11746 new file mode 100644
11747 index 0000000..f4f4912
11749 +++ b/fs/aufs/i_op.c
11752 + * Copyright (C) 2005-2009 Junjiro R. Okajima
11754 + * This program, aufs is free software; you can redistribute it and/or modify
11755 + * it under the terms of the GNU General Public License as published by
11756 + * the Free Software Foundation; either version 2 of the License, or
11757 + * (at your option) any later version.
11759 + * This program is distributed in the hope that it will be useful,
11760 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
11761 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11762 + * GNU General Public License for more details.
11764 + * You should have received a copy of the GNU General Public License
11765 + * along with this program; if not, write to the Free Software
11766 + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
11770 + * inode operations (except add/del/rename)
11773 +#include <linux/device_cgroup.h>
11774 +#include <linux/fs_stack.h>
11775 +#include <linux/mm.h>
11776 +#include <linux/namei.h>
11777 +#include <linux/security.h>
11778 +#include <linux/uaccess.h>
11781 +static int h_permission(struct inode *h_inode, int mask,
11782 + struct vfsmount *h_mnt, int brperm)
11785 + const unsigned char write_mask = !!(mask & (MAY_WRITE | MAY_APPEND));
11788 + if ((write_mask && IS_IMMUTABLE(h_inode))
11789 + || ((mask & MAY_EXEC)
11790 + && S_ISREG(h_inode->i_mode)
11791 + && ((h_mnt->mnt_flags & MNT_NOEXEC)
11792 + || !(h_inode->i_mode & S_IXUGO))))
11796 + * - skip the lower fs test in the case of write to ro branch.
11797 + * - nfs dir permission write check is optimized, but a policy for
11798 + * link/rename requires a real check.
11800 + if ((write_mask && !au_br_writable(brperm))
11801 + || (au_test_nfs(h_inode->i_sb) && S_ISDIR(h_inode->i_mode)
11802 + && write_mask && !(mask & MAY_READ))
11803 + || !h_inode->i_op
11804 + || !h_inode->i_op->permission) {
11805 + /* AuLabel(generic_permission); */
11806 + err = generic_permission(h_inode, mask, NULL);
11808 + /* AuLabel(h_inode->permission); */
11809 + err = h_inode->i_op->permission(h_inode, mask);
11814 + err = devcgroup_inode_permission(h_inode, mask);
11816 + err = security_inode_permission
11817 + (h_inode, mask & (MAY_READ | MAY_WRITE | MAY_EXEC
11824 +static int aufs_permission(struct inode *inode, int mask)
11827 + aufs_bindex_t bindex, bend;
11828 + const unsigned char isdir = !!S_ISDIR(inode->i_mode);
11829 + const unsigned char write_mask = !!(mask & (MAY_WRITE | MAY_APPEND));
11830 + struct inode *h_inode;
11831 + struct super_block *sb;
11832 + struct au_branch *br;
11834 + sb = inode->i_sb;
11835 + si_read_lock(sb, AuLock_FLUSH);
11836 + ii_read_lock_child(inode);
11838 + if (!isdir || write_mask) {
11839 + err = au_busy_or_stale();
11840 + h_inode = au_h_iptr(inode, au_ibstart(inode));
11841 + if (unlikely(!h_inode
11842 + || (h_inode->i_mode & S_IFMT)
11843 + != (inode->i_mode & S_IFMT)))
11847 + bindex = au_ibstart(inode);
11848 + br = au_sbr(sb, bindex);
11849 + err = h_permission(h_inode, mask, br->br_mnt, br->br_perm);
11850 + if (write_mask && !err) {
11851 + /* test whether the upper writable branch exists */
11853 + for (; bindex >= 0; bindex--)
11854 + if (!au_br_rdonly(au_sbr(sb, bindex))) {
11862 + /* non-write to dir */
11864 + bend = au_ibend(inode);
11865 + for (bindex = au_ibstart(inode); !err && bindex <= bend; bindex++) {
11866 + h_inode = au_h_iptr(inode, bindex);
11868 + err = au_busy_or_stale();
11869 + if (unlikely(!S_ISDIR(h_inode->i_mode)))
11872 + br = au_sbr(sb, bindex);
11873 + err = h_permission(h_inode, mask, br->br_mnt,
11879 + ii_read_unlock(inode);
11880 + si_read_unlock(sb);
11884 +/* ---------------------------------------------------------------------- */
11886 +static struct dentry *aufs_lookup(struct inode *dir, struct dentry *dentry,
11887 + struct nameidata *nd)
11889 + struct dentry *ret, *parent;
11890 + struct inode *inode, *h_inode;
11891 + struct mutex *mtx;
11892 + struct super_block *sb;
11893 + int err, npositive;
11894 + aufs_bindex_t bstart;
11899 + si_read_lock(sb, AuLock_FLUSH);
11900 + ret = ERR_PTR(-ENAMETOOLONG);
11901 + if (unlikely(dentry->d_name.len > AUFS_MAX_NAMELEN))
11903 + err = au_alloc_dinfo(dentry);
11904 + ret = ERR_PTR(err);
11905 + if (unlikely(err))
11908 + parent = dentry->d_parent; /* dir inode is locked */
11909 + di_read_lock_parent(parent, AuLock_IR);
11910 + npositive = au_lkup_dentry(dentry, au_dbstart(parent), /*type*/0, nd);
11911 + di_read_unlock(parent, AuLock_IR);
11913 + ret = ERR_PTR(err);
11914 + if (unlikely(err < 0))
11919 + bstart = au_dbstart(dentry);
11920 + h_inode = au_h_dptr(dentry, bstart)->d_inode;
11921 + if (!S_ISDIR(h_inode->i_mode)) {
11923 + * stop 'race'-ing between hardlinks under different
11926 + mtx = &au_sbr(sb, bstart)->br_xino.xi_nondir_mtx;
11928 + inode = au_new_inode(dentry, /*must_new*/0);
11929 + mutex_unlock(mtx);
11931 + inode = au_new_inode(dentry, /*must_new*/0);
11932 + ret = (void *)inode;
11934 + if (IS_ERR(inode))
11937 + ret = d_splice_alias(inode, dentry);
11938 + if (unlikely(IS_ERR(ret) && inode))
11939 + ii_write_unlock(inode);
11940 + au_store_oflag(nd, inode);
11943 + di_write_unlock(dentry);
11945 + si_read_unlock(sb);
11949 +/* ---------------------------------------------------------------------- */
11951 +static int au_wr_dir_cpup(struct dentry *dentry, struct dentry *parent,
11952 + const unsigned char add_entry, aufs_bindex_t bcpup,
11953 + aufs_bindex_t bstart)
11956 + struct dentry *h_parent;
11957 + struct inode *h_dir;
11960 + au_update_dbstart(dentry);
11961 + IMustLock(parent->d_inode);
11963 + di_write_lock_parent(parent);
11966 + if (!au_h_dptr(parent, bcpup)) {
11967 + if (bstart < bcpup)
11968 + err = au_cpdown_dirs(dentry, bcpup);
11970 + err = au_cpup_dirs(dentry, bcpup);
11972 + if (!err && add_entry) {
11973 + h_parent = au_h_dptr(parent, bcpup);
11974 + h_dir = h_parent->d_inode;
11975 + mutex_lock_nested(&h_dir->i_mutex, AuLsc_I_PARENT);
11976 + err = au_lkup_neg(dentry, bcpup);
11977 + /* todo: no unlock here */
11978 + mutex_unlock(&h_dir->i_mutex);
11979 + if (bstart < bcpup && au_dbstart(dentry) < 0) {
11980 + au_set_dbstart(dentry, 0);
11981 + au_update_dbrange(dentry, /*do_put_zero*/0);
11986 + di_write_unlock(parent);
11988 + err = bcpup; /* success */
11994 + * decide the branch and the parent dir where we will create a new entry.
11995 + * returns new bindex or an error.
11996 + * copyup the parent dir if needed.
11998 +int au_wr_dir(struct dentry *dentry, struct dentry *src_dentry,
11999 + struct au_wr_dir_args *args)
12002 + aufs_bindex_t bcpup, bstart, src_bstart;
12003 + const unsigned char add_entry = !!au_ftest_wrdir(args->flags,
12005 + struct super_block *sb;
12006 + struct dentry *parent;
12007 + struct au_sbinfo *sbinfo;
12009 + sb = dentry->d_sb;
12010 + sbinfo = au_sbi(sb);
12011 + parent = dget_parent(dentry);
12012 + bstart = au_dbstart(dentry);
12014 + if (args->force_btgt < 0) {
12015 + if (src_dentry) {
12016 + src_bstart = au_dbstart(src_dentry);
12017 + if (src_bstart < bstart)
12018 + bcpup = src_bstart;
12019 + } else if (add_entry) {
12020 + err = AuWbrCreate(sbinfo, dentry,
12021 + au_ftest_wrdir(args->flags, ISDIR));
12025 + if (bcpup < 0 || au_test_ro(sb, bcpup, dentry->d_inode)) {
12027 + err = AuWbrCopyup(sbinfo, dentry);
12029 + if (!IS_ROOT(dentry)) {
12030 + di_read_lock_parent(parent, !AuLock_IR);
12031 + err = AuWbrCopyup(sbinfo, dentry);
12032 + di_read_unlock(parent, !AuLock_IR);
12034 + err = AuWbrCopyup(sbinfo, dentry);
12037 + if (unlikely(err < 0))
12041 + bcpup = args->force_btgt;
12042 + AuDebugOn(au_test_ro(sb, bcpup, dentry->d_inode));
12044 + AuDbg("bstart %d, bcpup %d\n", bstart, bcpup);
12045 + if (bstart < bcpup)
12046 + au_update_dbrange(dentry, /*do_put_zero*/1);
12049 + if (bcpup == bstart)
12050 + goto out; /* success */
12052 + /* copyup the new parent into the branch we process */
12053 + err = au_wr_dir_cpup(dentry, parent, add_entry, bcpup, bstart);
12060 +/* ---------------------------------------------------------------------- */
12062 +struct dentry *au_pinned_h_parent(struct au_pin *pin)
12064 + if (pin && pin->parent)
12065 + return au_h_dptr(pin->parent, pin->bindex);
12069 +void au_unpin(struct au_pin *p)
12071 + if (au_ftest_pin(p->flags, MNT_WRITE))
12072 + mnt_drop_write(p->h_mnt);
12076 + au_hin_imtx_unlock(p->hdir);
12077 + if (!au_ftest_pin(p->flags, DI_LOCKED))
12078 + di_read_unlock(p->parent, AuLock_IR);
12079 + iput(p->hdir->hi_inode);
12081 + p->parent = NULL;
12086 +int au_do_pin(struct au_pin *p)
12089 + struct super_block *sb;
12090 + struct dentry *h_dentry, *h_parent;
12091 + struct au_branch *br;
12092 + struct inode *h_dir;
12095 + sb = p->dentry->d_sb;
12096 + br = au_sbr(sb, p->bindex);
12097 + if (IS_ROOT(p->dentry)) {
12098 + if (au_ftest_pin(p->flags, MNT_WRITE)) {
12099 + p->h_mnt = br->br_mnt;
12100 + err = mnt_want_write(p->h_mnt);
12101 + if (unlikely(err)) {
12102 + au_fclr_pin(p->flags, MNT_WRITE);
12110 + if (p->bindex <= au_dbend(p->dentry))
12111 + h_dentry = au_h_dptr(p->dentry, p->bindex);
12113 + p->parent = dget_parent(p->dentry);
12114 + if (!au_ftest_pin(p->flags, DI_LOCKED))
12115 + di_read_lock(p->parent, AuLock_IR, p->lsc_di);
12118 + h_parent = au_h_dptr(p->parent, p->bindex);
12119 + p->hdir = au_hi(p->parent->d_inode, p->bindex);
12121 + h_dir = p->hdir->hi_inode;
12124 + if (unlikely(!p->hdir || !h_dir)) {
12125 + if (!au_ftest_pin(p->flags, DI_LOCKED))
12126 + di_read_unlock(p->parent, AuLock_IR);
12128 + p->parent = NULL;
12133 + au_hin_imtx_lock_nested(p->hdir, p->lsc_hi);
12135 + if (unlikely(p->hdir->hi_inode != h_parent->d_inode)) {
12140 + err = au_h_verify(h_dentry, p->udba, h_dir, h_parent, br);
12141 + if (unlikely(err)) {
12142 + au_fclr_pin(p->flags, MNT_WRITE);
12147 + if (au_ftest_pin(p->flags, MNT_WRITE)) {
12148 + p->h_mnt = br->br_mnt;
12149 + err = mnt_want_write(p->h_mnt);
12150 + if (unlikely(err)) {
12151 + au_fclr_pin(p->flags, MNT_WRITE);
12155 + goto out; /* success */
12160 + AuErr("err %d\n", err);
12161 + err = au_busy_or_stale();
12166 +void au_pin_init(struct au_pin *p, struct dentry *dentry,
12167 + aufs_bindex_t bindex, int lsc_di, int lsc_hi,
12168 + unsigned int udba, unsigned char flags)
12170 + p->dentry = dentry;
12172 + p->lsc_di = lsc_di;
12173 + p->lsc_hi = lsc_hi;
12174 + p->flags = flags;
12175 + p->bindex = bindex;
12177 + p->parent = NULL;
12182 +int au_pin(struct au_pin *pin, struct dentry *dentry, aufs_bindex_t bindex,
12183 + unsigned int udba, unsigned char flags)
12185 + au_pin_init(pin, dentry, bindex, AuLsc_DI_PARENT, AuLsc_I_PARENT2,
12187 + return au_do_pin(pin);
12190 +/* ---------------------------------------------------------------------- */
12192 +#define AuIcpup_DID_CPUP 1
12193 +#define au_ftest_icpup(flags, name) ((flags) & AuIcpup_##name)
12194 +#define au_fset_icpup(flags, name) { (flags) |= AuIcpup_##name; }
12195 +#define au_fclr_icpup(flags, name) { (flags) &= ~AuIcpup_##name; }
12197 +struct au_icpup_args {
12198 + unsigned char flags;
12199 + unsigned char pin_flags;
12200 + aufs_bindex_t btgt;
12201 + struct au_pin pin;
12202 + struct path h_path;
12203 + struct inode *h_inode;
12206 +static int au_lock_and_icpup(struct dentry *dentry, struct iattr *ia,
12207 + struct au_icpup_args *a)
12210 + unsigned int udba;
12212 + aufs_bindex_t bstart;
12213 + struct dentry *hi_wh, *parent;
12214 + struct inode *inode;
12215 + struct au_wr_dir_args wr_dir_args = {
12216 + .force_btgt = -1,
12220 + di_write_lock_child(dentry);
12221 + bstart = au_dbstart(dentry);
12222 + inode = dentry->d_inode;
12223 + if (S_ISDIR(inode->i_mode))
12224 + au_fset_wrdir(wr_dir_args.flags, ISDIR);
12225 + /* plink or hi_wh() case */
12226 + if (bstart != au_ibstart(inode))
12227 + wr_dir_args.force_btgt = au_ibstart(inode);
12228 + err = au_wr_dir(dentry, /*src_dentry*/NULL, &wr_dir_args);
12229 + if (unlikely(err < 0))
12232 + if (err != bstart)
12233 + au_fset_icpup(a->flags, DID_CPUP);
12236 + a->pin_flags = AuPin_MNT_WRITE;
12238 + if (!IS_ROOT(dentry)) {
12239 + au_fset_pin(a->pin_flags, DI_LOCKED);
12240 + parent = dget_parent(dentry);
12241 + di_write_lock_parent(parent);
12244 + udba = au_opt_udba(dentry->d_sb);
12245 + if (d_unhashed(dentry) || (ia->ia_valid & ATTR_FILE))
12246 + udba = AuOpt_UDBA_NONE;
12247 + err = au_pin(&a->pin, dentry, a->btgt, udba, a->pin_flags);
12248 + if (unlikely(err)) {
12250 + di_write_unlock(parent);
12255 + a->h_path.dentry = au_h_dptr(dentry, bstart);
12256 + a->h_inode = a->h_path.dentry->d_inode;
12257 + mutex_lock_nested(&a->h_inode->i_mutex, AuLsc_I_CHILD);
12259 + if ((ia->ia_valid & ATTR_SIZE) && ia->ia_size < i_size_read(a->h_inode))
12260 + sz = ia->ia_size;
12263 + if (au_ftest_icpup(a->flags, DID_CPUP) && d_unhashed(dentry)) {
12264 + hi_wh = au_hi_wh(inode, a->btgt);
12266 + err = au_sio_cpup_wh(dentry, a->btgt, sz, /*file*/NULL);
12267 + if (unlikely(err))
12269 + hi_wh = au_hi_wh(inode, a->btgt);
12270 + /* todo: revalidate hi_wh? */
12275 + au_pin_set_parent_lflag(&a->pin, /*lflag*/0);
12276 + di_downgrade_lock(parent, AuLock_IR);
12279 + if (!au_ftest_icpup(a->flags, DID_CPUP))
12280 + goto out; /* success */
12282 + if (!d_unhashed(dentry)) {
12283 + err = au_sio_cpup_simple(dentry, a->btgt, sz, AuCpup_DTIME);
12285 + a->h_path.dentry = au_h_dptr(dentry, a->btgt);
12286 + } else if (!hi_wh)
12287 + a->h_path.dentry = au_h_dptr(dentry, a->btgt);
12289 + a->h_path.dentry = hi_wh; /* do not dget here */
12292 + mutex_unlock(&a->h_inode->i_mutex);
12293 + a->h_inode = a->h_path.dentry->d_inode;
12295 + mutex_lock_nested(&a->h_inode->i_mutex, AuLsc_I_CHILD);
12296 + goto out; /* success */
12299 + au_unpin(&a->pin);
12302 + di_write_unlock(dentry);
12307 +static int aufs_setattr(struct dentry *dentry, struct iattr *ia)
12310 + struct inode *inode;
12311 + struct super_block *sb;
12312 + struct file *file;
12313 + struct au_icpup_args *a;
12316 + a = kzalloc(sizeof(*a), GFP_NOFS);
12317 + if (unlikely(!a))
12320 + inode = dentry->d_inode;
12321 + IMustLock(inode);
12322 + sb = dentry->d_sb;
12323 + si_read_lock(sb, AuLock_FLUSH);
12326 + if (ia->ia_valid & ATTR_FILE) {
12327 + /* currently ftruncate(2) only */
12328 + file = ia->ia_file;
12329 + fi_write_lock(file);
12330 + ia->ia_file = au_h_fptr(file, au_fbstart(file));
12333 + if (ia->ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID))
12334 + ia->ia_valid &= ~ATTR_MODE;
12336 + err = au_lock_and_icpup(dentry, ia, a);
12337 + if (unlikely(err < 0))
12339 + if (au_ftest_icpup(a->flags, DID_CPUP)) {
12340 + ia->ia_file = NULL;
12341 + ia->ia_valid &= ~ATTR_FILE;
12344 + a->h_path.mnt = au_sbr_mnt(sb, a->btgt);
12345 + if (ia->ia_valid & ATTR_SIZE) {
12348 + if (ia->ia_size < i_size_read(inode)) {
12350 + err = vmtruncate(inode, ia->ia_size);
12351 + if (unlikely(err))
12356 + if (ia->ia_valid & ATTR_FILE)
12358 + mutex_unlock(&a->h_inode->i_mutex);
12359 + err = vfsub_trunc(&a->h_path, ia->ia_size, ia->ia_valid, f);
12360 + mutex_lock_nested(&a->h_inode->i_mutex, AuLsc_I_CHILD);
12362 + err = vfsub_notify_change(&a->h_path, ia);
12364 + au_cpup_attr_changeable(inode);
12367 + mutex_unlock(&a->h_inode->i_mutex);
12368 + au_unpin(&a->pin);
12369 + di_write_unlock(dentry);
12372 + fi_write_unlock(file);
12373 + ia->ia_file = file;
12374 + ia->ia_valid |= ATTR_FILE;
12376 + si_read_unlock(sb);
12382 +static int au_getattr_lock_reval(struct dentry *dentry, unsigned int sigen)
12385 + struct inode *inode;
12386 + struct dentry *parent;
12389 + inode = dentry->d_inode;
12390 + di_write_lock_child(dentry);
12391 + if (au_digen(dentry) != sigen || au_iigen(inode) != sigen) {
12392 + parent = dget_parent(dentry);
12393 + di_read_lock_parent(parent, AuLock_IR);
12394 + /* returns a number of positive dentries */
12395 + err = au_refresh_hdentry(dentry, inode->i_mode & S_IFMT);
12397 + err = au_refresh_hinode(inode, dentry);
12398 + di_read_unlock(parent, AuLock_IR);
12401 + di_downgrade_lock(dentry, AuLock_IR);
12402 + if (unlikely(err))
12403 + di_read_unlock(dentry, AuLock_IR);
12409 +static void au_refresh_iattr(struct inode *inode, struct kstat *st,
12410 + unsigned int nlink)
12412 + inode->i_mode = st->mode;
12413 + inode->i_uid = st->uid;
12414 + inode->i_gid = st->gid;
12415 + inode->i_atime = st->atime;
12416 + inode->i_mtime = st->mtime;
12417 + inode->i_ctime = st->ctime;
12419 + au_cpup_attr_nlink(inode, /*force*/0);
12420 + if (S_ISDIR(inode->i_mode)) {
12421 + inode->i_nlink -= nlink;
12422 + inode->i_nlink += st->nlink;
12425 + spin_lock(&inode->i_lock);
12426 + inode->i_blocks = st->blocks;
12427 + i_size_write(inode, st->size);
12428 + spin_unlock(&inode->i_lock);
12431 +static int aufs_getattr(struct vfsmount *mnt __maybe_unused,
12432 + struct dentry *dentry, struct kstat *st)
12435 + unsigned int mnt_flags;
12436 + aufs_bindex_t bindex;
12437 + unsigned char udba_none, positive;
12438 + struct super_block *sb, *h_sb;
12439 + struct inode *inode;
12440 + struct vfsmount *h_mnt;
12441 + struct dentry *h_dentry;
12444 + sb = dentry->d_sb;
12445 + inode = dentry->d_inode;
12446 + si_read_lock(sb, AuLock_FLUSH);
12447 + mnt_flags = au_mntflags(sb);
12448 + udba_none = !!au_opt_test(mnt_flags, UDBA_NONE);
12450 + /* support fstat(2) */
12451 + if (!d_unhashed(dentry) && !udba_none) {
12452 + unsigned int sigen = au_sigen(sb);
12453 + if (au_digen(dentry) == sigen && au_iigen(inode) == sigen)
12454 + di_read_lock_child(dentry, AuLock_IR);
12456 + AuDebugOn(IS_ROOT(dentry));
12457 + err = au_getattr_lock_reval(dentry, sigen);
12458 + if (unlikely(err))
12462 + di_read_lock_child(dentry, AuLock_IR);
12464 + bindex = au_ibstart(inode);
12465 + h_mnt = au_sbr_mnt(sb, bindex);
12466 + h_sb = h_mnt->mnt_sb;
12467 + if (!au_test_fs_bad_iattr(h_sb) && udba_none)
12468 + goto out_fill; /* success */
12471 + if (au_dbstart(dentry) == bindex)
12472 + h_dentry = dget(au_h_dptr(dentry, bindex));
12473 + else if (au_opt_test(mnt_flags, PLINK) && au_plink_test(inode)) {
12474 + h_dentry = au_plink_lkup(inode, bindex);
12475 + if (IS_ERR(h_dentry))
12476 + goto out_fill; /* pretending success */
12478 + /* illegally overlapped or something */
12479 + if (unlikely(!h_dentry))
12480 + goto out_fill; /* pretending success */
12482 + positive = !!h_dentry->d_inode;
12484 + err = vfs_getattr(h_mnt, h_dentry, st);
12488 + au_refresh_iattr(inode, st, h_dentry->d_inode->i_nlink);
12489 + goto out_fill; /* success */
12494 + generic_fillattr(inode, st);
12496 + di_read_unlock(dentry, AuLock_IR);
12498 + si_read_unlock(sb);
12502 +/* ---------------------------------------------------------------------- */
12504 +static int h_readlink(struct dentry *dentry, int bindex, char __user *buf,
12508 + struct super_block *sb;
12509 + struct dentry *h_dentry;
12512 + h_dentry = au_h_dptr(dentry, bindex);
12513 + if (unlikely(/* !h_dentry
12514 + || !h_dentry->d_inode
12515 + || */ !h_dentry->d_inode->i_op
12516 + || !h_dentry->d_inode->i_op->readlink))
12519 + err = security_inode_readlink(h_dentry);
12520 + if (unlikely(err))
12523 + sb = dentry->d_sb;
12524 + if (!au_test_ro(sb, bindex, dentry->d_inode)) {
12525 + vfsub_touch_atime(au_sbr_mnt(sb, bindex), h_dentry);
12526 + fsstack_copy_attr_atime(dentry->d_inode, h_dentry->d_inode);
12528 + err = h_dentry->d_inode->i_op->readlink(h_dentry, buf, bufsiz);
12534 +static int aufs_readlink(struct dentry *dentry, char __user *buf, int bufsiz)
12538 + aufs_read_lock(dentry, AuLock_IR);
12539 + err = h_readlink(dentry, au_dbstart(dentry), buf, bufsiz);
12540 + aufs_read_unlock(dentry, AuLock_IR);
12545 +static void *aufs_follow_link(struct dentry *dentry, struct nameidata *nd)
12549 + mm_segment_t old_fs;
12552 + buf = __getname();
12553 + if (unlikely(!buf))
12556 + aufs_read_lock(dentry, AuLock_IR);
12557 + old_fs = get_fs();
12558 + set_fs(KERNEL_DS);
12559 + err = h_readlink(dentry, au_dbstart(dentry), (char __user *)buf,
12562 + aufs_read_unlock(dentry, AuLock_IR);
12566 + /* will be freed by put_link */
12567 + nd_set_link(nd, buf);
12568 + return NULL; /* success */
12573 + path_put(&nd->path);
12575 + return ERR_PTR(err);
12578 +static void aufs_put_link(struct dentry *dentry __maybe_unused,
12579 + struct nameidata *nd, void *cookie __maybe_unused)
12581 + __putname(nd_get_link(nd));
12584 +/* ---------------------------------------------------------------------- */
12586 +static void aufs_truncate_range(struct inode *inode __maybe_unused,
12587 + loff_t start __maybe_unused,
12588 + loff_t end __maybe_unused)
12593 +/* ---------------------------------------------------------------------- */
12595 +struct inode_operations aufs_symlink_iop = {
12596 + .permission = aufs_permission,
12597 + .setattr = aufs_setattr,
12598 + .getattr = aufs_getattr,
12599 + .readlink = aufs_readlink,
12600 + .follow_link = aufs_follow_link,
12601 + .put_link = aufs_put_link
12604 +struct inode_operations aufs_dir_iop = {
12605 + .create = aufs_create,
12606 + .lookup = aufs_lookup,
12607 + .link = aufs_link,
12608 + .unlink = aufs_unlink,
12609 + .symlink = aufs_symlink,
12610 + .mkdir = aufs_mkdir,
12611 + .rmdir = aufs_rmdir,
12612 + .mknod = aufs_mknod,
12613 + .rename = aufs_rename,
12615 + .permission = aufs_permission,
12616 + .setattr = aufs_setattr,
12617 + .getattr = aufs_getattr
12620 +struct inode_operations aufs_iop = {
12621 + .permission = aufs_permission,
12622 + .setattr = aufs_setattr,
12623 + .getattr = aufs_getattr,
12624 + .truncate_range = aufs_truncate_range
12626 diff --git a/fs/aufs/i_op_add.c b/fs/aufs/i_op_add.c
12627 new file mode 100644
12628 index 0000000..813890f
12630 +++ b/fs/aufs/i_op_add.c
12633 + * Copyright (C) 2005-2009 Junjiro R. Okajima
12635 + * This program, aufs is free software; you can redistribute it and/or modify
12636 + * it under the terms of the GNU General Public License as published by
12637 + * the Free Software Foundation; either version 2 of the License, or
12638 + * (at your option) any later version.
12640 + * This program is distributed in the hope that it will be useful,
12641 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
12642 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12643 + * GNU General Public License for more details.
12645 + * You should have received a copy of the GNU General Public License
12646 + * along with this program; if not, write to the Free Software
12647 + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
12651 + * inode operations (add entry)
12657 + * final procedure of adding a new entry, except link(2).
12658 + * remove whiteout, instantiate, copyup the parent dir's times and size
12659 + * and update version.
12660 + * if it failed, re-create the removed whiteout.
12662 +static int epilog(struct inode *dir, aufs_bindex_t bindex,
12663 + struct dentry *wh_dentry, struct dentry *dentry)
12666 + aufs_bindex_t bwh;
12667 + struct path h_path;
12668 + struct inode *inode, *h_dir;
12669 + struct dentry *wh;
12673 + h_dir = wh_dentry->d_parent->d_inode; /* dir inode is locked */
12674 + IMustLock(h_dir);
12675 + AuDebugOn(au_h_iptr(dir, bindex) != h_dir);
12676 + bwh = au_dbwh(dentry);
12677 + h_path.dentry = wh_dentry;
12678 + h_path.mnt = au_sbr_mnt(dir->i_sb, bindex);
12679 + err = au_wh_unlink_dentry(au_h_iptr(dir, bindex), &h_path,
12681 + if (unlikely(err))
12685 + inode = au_new_inode(dentry, /*must_new*/1);
12686 + if (!IS_ERR(inode)) {
12687 + d_instantiate(dentry, inode);
12688 + dir = dentry->d_parent->d_inode; /* dir inode is locked */
12690 + if (au_ibstart(dir) == au_dbstart(dentry))
12691 + au_cpup_attr_timesizes(dir);
12692 + dir->i_version++;
12693 + return 0; /* success */
12696 + err = PTR_ERR(inode);
12701 + /* dir inode is locked */
12702 + wh = au_wh_create(dentry, bwh, wh_dentry->d_parent);
12703 + rerr = PTR_ERR(wh);
12704 + if (IS_ERR(wh)) {
12705 + AuIOErr("%.*s reverting whiteout failed(%d, %d)\n",
12706 + AuDLNPair(dentry), err, rerr);
12716 + * simple tests for the adding inode operations.
12717 + * following the checks in vfs, plus the parent-child relationship.
12719 +int au_may_add(struct dentry *dentry, aufs_bindex_t bindex,
12720 + struct dentry *h_parent, int isdir)
12724 + struct dentry *h_dentry;
12725 + struct inode *h_inode;
12727 + err = -ENAMETOOLONG;
12728 + if (unlikely(dentry->d_name.len > AUFS_MAX_NAMELEN))
12731 + h_dentry = au_h_dptr(dentry, bindex);
12732 + h_inode = h_dentry->d_inode;
12733 + if (!dentry->d_inode) {
12735 + if (unlikely(h_inode))
12738 + /* rename(2) case */
12740 + if (unlikely(!h_inode || !h_inode->i_nlink))
12743 + h_mode = h_inode->i_mode;
12746 + if (unlikely(S_ISDIR(h_mode)))
12748 + } else if (unlikely(!S_ISDIR(h_mode))) {
12755 + /* expected parent dir is locked */
12756 + if (unlikely(h_parent != h_dentry->d_parent))
12766 + * initial procedure of adding a new entry.
12767 + * prepare writable branch and the parent dir, lock it,
12768 + * and lookup whiteout for the new entry.
12770 +static struct dentry*
12771 +lock_hdir_lkup_wh(struct dentry *dentry, struct au_dtime *dt,
12772 + struct dentry *src_dentry, struct au_pin *pin,
12773 + struct au_wr_dir_args *wr_dir_args)
12775 + struct dentry *wh_dentry, *h_parent;
12776 + struct super_block *sb;
12777 + struct au_branch *br;
12779 + unsigned int udba;
12780 + aufs_bindex_t bcpup;
12782 + AuDbg("%.*s\n", AuDLNPair(dentry));
12784 + err = au_wr_dir(dentry, src_dentry, wr_dir_args);
12786 + wh_dentry = ERR_PTR(err);
12787 + if (unlikely(err < 0))
12790 + sb = dentry->d_sb;
12791 + udba = au_opt_udba(sb);
12792 + err = au_pin(pin, dentry, bcpup, udba,
12793 + AuPin_DI_LOCKED | AuPin_MNT_WRITE);
12794 + wh_dentry = ERR_PTR(err);
12795 + if (unlikely(err))
12798 + h_parent = au_pinned_h_parent(pin);
12799 + if (udba != AuOpt_UDBA_NONE
12800 + && au_dbstart(dentry) == bcpup)
12801 + err = au_may_add(dentry, bcpup, h_parent,
12802 + au_ftest_wrdir(wr_dir_args->flags, ISDIR));
12803 + else if (unlikely(dentry->d_name.len > AUFS_MAX_NAMELEN))
12804 + err = -ENAMETOOLONG;
12805 + wh_dentry = ERR_PTR(err);
12806 + if (unlikely(err))
12809 + br = au_sbr(sb, bcpup);
12811 + struct path tmp = {
12812 + .dentry = h_parent,
12813 + .mnt = br->br_mnt
12815 + au_dtime_store(dt, au_pinned_parent(pin), &tmp);
12818 + wh_dentry = NULL;
12819 + if (bcpup != au_dbwh(dentry))
12820 + goto out; /* success */
12822 + wh_dentry = au_wh_lkup(h_parent, &dentry->d_name, br);
12825 + if (IS_ERR(wh_dentry))
12828 + return wh_dentry;
12831 +/* ---------------------------------------------------------------------- */
12833 +enum { Mknod, Symlink, Creat };
12834 +struct simple_arg {
12839 + struct nameidata *nd;
12842 + const char *symname;
12851 +static int add_simple(struct inode *dir, struct dentry *dentry,
12852 + struct simple_arg *arg)
12855 + aufs_bindex_t bstart;
12856 + unsigned char created;
12857 + struct au_dtime dt;
12858 + struct au_pin pin;
12859 + struct path h_path;
12860 + struct dentry *wh_dentry, *parent;
12861 + struct inode *h_dir;
12862 + struct au_wr_dir_args wr_dir_args = {
12863 + .force_btgt = -1,
12864 + .flags = AuWrDir_ADD_ENTRY
12867 + AuDbg("%.*s\n", AuDLNPair(dentry));
12870 + parent = dentry->d_parent; /* dir inode is locked */
12871 + aufs_read_lock(dentry, AuLock_DW);
12872 + di_write_lock_parent(parent);
12873 + wh_dentry = lock_hdir_lkup_wh(dentry, &dt, /*src_dentry*/NULL, &pin,
12875 + err = PTR_ERR(wh_dentry);
12876 + if (IS_ERR(wh_dentry))
12879 + bstart = au_dbstart(dentry);
12880 + h_path.dentry = au_h_dptr(dentry, bstart);
12881 + h_path.mnt = au_sbr_mnt(dentry->d_sb, bstart);
12882 + h_dir = au_pinned_h_dir(&pin);
12883 + switch (arg->type) {
12885 + err = vfsub_create(h_dir, &h_path, arg->u.c.mode);
12888 + err = vfsub_symlink(h_dir, &h_path, arg->u.s.symname);
12891 + err = vfsub_mknod(h_dir, &h_path, arg->u.m.mode, arg->u.m.dev);
12898 + err = epilog(dir, bstart, wh_dentry, dentry);
12901 + if (unlikely(created && err && h_path.dentry->d_inode)) {
12903 + rerr = vfsub_unlink(h_dir, &h_path, /*force*/0);
12905 + AuIOErr("%.*s revert failure(%d, %d)\n",
12906 + AuDLNPair(dentry), err, rerr);
12909 + au_dtime_revert(&dt);
12917 + if (unlikely(err)) {
12918 + au_update_dbstart(dentry);
12921 + di_write_unlock(parent);
12922 + aufs_read_unlock(dentry, AuLock_DW);
12926 +int aufs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev)
12928 + struct simple_arg arg = {
12935 + return add_simple(dir, dentry, &arg);
12938 +int aufs_symlink(struct inode *dir, struct dentry *dentry, const char *symname)
12940 + struct simple_arg arg = {
12942 + .u.s.symname = symname
12944 + return add_simple(dir, dentry, &arg);
12947 +int aufs_create(struct inode *dir, struct dentry *dentry, int mode,
12948 + struct nameidata *nd)
12950 + struct simple_arg arg = {
12957 + return add_simple(dir, dentry, &arg);
12960 +/* ---------------------------------------------------------------------- */
12962 +struct au_link_args {
12963 + aufs_bindex_t bdst, bsrc;
12964 + struct au_pin pin;
12965 + struct path h_path;
12966 + struct dentry *src_parent, *parent;
12969 +static int au_cpup_before_link(struct dentry *src_dentry,
12970 + struct au_link_args *a)
12973 + struct dentry *h_src_dentry;
12974 + struct mutex *h_mtx;
12976 + di_read_lock_parent(a->src_parent, AuLock_IR);
12977 + err = au_test_and_cpup_dirs(src_dentry, a->bdst);
12978 + if (unlikely(err))
12981 + h_src_dentry = au_h_dptr(src_dentry, a->bsrc);
12982 + h_mtx = &h_src_dentry->d_inode->i_mutex;
12983 + err = au_pin(&a->pin, src_dentry, a->bdst,
12984 + au_opt_udba(src_dentry->d_sb),
12985 + AuPin_DI_LOCKED | AuPin_MNT_WRITE);
12986 + if (unlikely(err))
12988 + mutex_lock_nested(h_mtx, AuLsc_I_CHILD);
12989 + err = au_sio_cpup_simple(src_dentry, a->bdst, -1,
12990 + AuCpup_DTIME /* | AuCpup_KEEPLINO */);
12991 + mutex_unlock(h_mtx);
12992 + au_unpin(&a->pin);
12995 + di_read_unlock(a->src_parent, AuLock_IR);
12999 +static int au_cpup_or_link(struct dentry *src_dentry, struct au_link_args *a)
13002 + unsigned char plink;
13003 + struct inode *h_inode, *inode;
13004 + struct dentry *h_src_dentry;
13005 + struct super_block *sb;
13009 + sb = src_dentry->d_sb;
13010 + inode = src_dentry->d_inode;
13011 + if (au_ibstart(inode) <= a->bdst)
13012 + h_inode = au_h_iptr(inode, a->bdst);
13013 + if (!h_inode || !h_inode->i_nlink) {
13014 + /* copyup src_dentry as the name of dentry. */
13015 + au_set_dbstart(src_dentry, a->bdst);
13016 + au_set_h_dptr(src_dentry, a->bdst, dget(a->h_path.dentry));
13017 + h_inode = au_h_dptr(src_dentry, a->bsrc)->d_inode;
13018 + mutex_lock_nested(&h_inode->i_mutex, AuLsc_I_CHILD);
13019 + err = au_sio_cpup_single(src_dentry, a->bdst, a->bsrc, -1,
13020 + AuCpup_KEEPLINO, a->parent);
13021 + mutex_unlock(&h_inode->i_mutex);
13022 + au_set_h_dptr(src_dentry, a->bdst, NULL);
13023 + au_set_dbstart(src_dentry, a->bsrc);
13025 + /* the inode of src_dentry already exists on a.bdst branch */
13026 + h_src_dentry = d_find_alias(h_inode);
13027 + if (!h_src_dentry && au_plink_test(inode)) {
13029 + h_src_dentry = au_plink_lkup(inode, a->bdst);
13030 + err = PTR_ERR(h_src_dentry);
13031 + if (IS_ERR(h_src_dentry))
13034 + if (unlikely(!h_src_dentry->d_inode)) {
13035 + dput(h_src_dentry);
13036 + h_src_dentry = NULL;
13040 + if (h_src_dentry) {
13041 + err = vfsub_link(h_src_dentry, au_pinned_h_dir(&a->pin),
13043 + dput(h_src_dentry);
13045 + AuIOErr("no dentry found for hi%lu on b%d\n",
13046 + h_inode->i_ino, a->bdst);
13051 + if (!err && !plink)
13052 + au_plink_append(inode, a->bdst, a->h_path.dentry);
13058 +int aufs_link(struct dentry *src_dentry, struct inode *dir,
13059 + struct dentry *dentry)
13062 + struct au_dtime dt;
13063 + struct au_link_args *a;
13064 + struct dentry *wh_dentry, *h_src_dentry;
13065 + struct inode *inode;
13066 + struct super_block *sb;
13067 + struct au_wr_dir_args wr_dir_args = {
13068 + /* .force_btgt = -1, */
13069 + .flags = AuWrDir_ADD_ENTRY
13073 + inode = src_dentry->d_inode;
13074 + IMustLock(inode);
13077 + if (unlikely(!inode->i_nlink))
13081 + a = kzalloc(sizeof(*a), GFP_NOFS);
13082 + if (unlikely(!a))
13085 + a->parent = dentry->d_parent; /* dir inode is locked */
13086 + aufs_read_and_write_lock2(dentry, src_dentry, /*AuLock_FLUSH*/0);
13087 + a->src_parent = dget_parent(src_dentry);
13088 + wr_dir_args.force_btgt = au_dbstart(src_dentry);
13090 + di_write_lock_parent(a->parent);
13091 + wr_dir_args.force_btgt = au_wbr(dentry, wr_dir_args.force_btgt);
13092 + wh_dentry = lock_hdir_lkup_wh(dentry, &dt, src_dentry, &a->pin,
13094 + err = PTR_ERR(wh_dentry);
13095 + if (IS_ERR(wh_dentry))
13099 + sb = dentry->d_sb;
13100 + a->bdst = au_dbstart(dentry);
13101 + a->h_path.dentry = au_h_dptr(dentry, a->bdst);
13102 + a->h_path.mnt = au_sbr_mnt(sb, a->bdst);
13103 + a->bsrc = au_dbstart(src_dentry);
13104 + if (au_opt_test(au_mntflags(sb), PLINK)) {
13105 + if (a->bdst < a->bsrc
13106 + /* && h_src_dentry->d_sb != a->h_path.dentry->d_sb */)
13107 + err = au_cpup_or_link(src_dentry, a);
13109 + h_src_dentry = au_h_dptr(src_dentry, a->bdst);
13110 + err = vfsub_link(h_src_dentry, au_pinned_h_dir(&a->pin),
13115 + * copyup src_dentry to the branch we process,
13116 + * and then link(2) to it.
13118 + if (a->bdst < a->bsrc
13119 + /* && h_src_dentry->d_sb != a->h_path.dentry->d_sb */) {
13120 + au_unpin(&a->pin);
13121 + di_write_unlock(a->parent);
13122 + err = au_cpup_before_link(src_dentry, a);
13123 + di_write_lock_parent(a->parent);
13125 + err = au_pin(&a->pin, dentry, a->bdst,
13127 + AuPin_DI_LOCKED | AuPin_MNT_WRITE);
13128 + if (unlikely(err))
13132 + h_src_dentry = au_h_dptr(src_dentry, a->bdst);
13134 + if (h_src_dentry && h_src_dentry->d_inode)
13135 + err = vfsub_link(h_src_dentry,
13136 + au_pinned_h_dir(&a->pin),
13140 + if (unlikely(err))
13144 + a->h_path.dentry = wh_dentry;
13145 + err = au_wh_unlink_dentry(au_pinned_h_dir(&a->pin), &a->h_path,
13147 + if (unlikely(err))
13151 + dir->i_version++;
13152 + if (au_ibstart(dir) == au_dbstart(dentry))
13153 + au_cpup_attr_timesizes(dir);
13154 + inc_nlink(inode);
13155 + inode->i_ctime = dir->i_ctime;
13156 + if (!d_unhashed(a->h_path.dentry))
13157 + d_instantiate(dentry, au_igrab(inode));
13159 + /* some filesystem calls d_drop() */
13161 + goto out_unpin; /* success */
13164 + rerr = vfsub_unlink(au_pinned_h_dir(&a->pin), &a->h_path, /*force*/0);
13167 + AuIOErr("%.*s reverting failed(%d, %d)\n",
13168 + AuDLNPair(dentry), err, rerr);
13172 + au_dtime_revert(&dt);
13174 + au_unpin(&a->pin);
13178 + if (unlikely(err)) {
13179 + au_update_dbstart(dentry);
13182 + di_write_unlock(a->parent);
13183 + dput(a->src_parent);
13184 + aufs_read_and_write_unlock2(dentry, src_dentry);
13190 +int aufs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
13193 + aufs_bindex_t bindex;
13194 + unsigned char diropq;
13195 + struct path h_path;
13196 + struct dentry *wh_dentry, *parent, *opq_dentry;
13197 + struct mutex *h_mtx;
13198 + struct super_block *sb;
13200 + struct au_pin pin;
13201 + struct au_dtime dt;
13202 + } *a; /* reduce the stack usage */
13203 + struct au_wr_dir_args wr_dir_args = {
13204 + .force_btgt = -1,
13205 + .flags = AuWrDir_ADD_ENTRY | AuWrDir_ISDIR
13211 + a = kmalloc(sizeof(*a), GFP_NOFS);
13212 + if (unlikely(!a))
13215 + aufs_read_lock(dentry, AuLock_DW);
13216 + parent = dentry->d_parent; /* dir inode is locked */
13217 + di_write_lock_parent(parent);
13218 + wh_dentry = lock_hdir_lkup_wh(dentry, &a->dt, /*src_dentry*/NULL,
13219 + &a->pin, &wr_dir_args);
13220 + err = PTR_ERR(wh_dentry);
13221 + if (IS_ERR(wh_dentry))
13224 + sb = dentry->d_sb;
13225 + bindex = au_dbstart(dentry);
13226 + h_path.dentry = au_h_dptr(dentry, bindex);
13227 + h_path.mnt = au_sbr_mnt(sb, bindex);
13228 + err = vfsub_mkdir(au_pinned_h_dir(&a->pin), &h_path, mode);
13229 + if (unlikely(err))
13232 + /* make the dir opaque */
13234 + h_mtx = &h_path.dentry->d_inode->i_mutex;
13236 + || au_opt_test(au_mntflags(sb), ALWAYS_DIROPQ)) {
13237 + mutex_lock_nested(h_mtx, AuLsc_I_CHILD);
13238 + opq_dentry = au_diropq_create(dentry, bindex);
13239 + mutex_unlock(h_mtx);
13240 + err = PTR_ERR(opq_dentry);
13241 + if (IS_ERR(opq_dentry))
13243 + dput(opq_dentry);
13247 + err = epilog(dir, bindex, wh_dentry, dentry);
13250 + goto out_unlock; /* success */
13255 + AuLabel(revert opq);
13256 + mutex_lock_nested(h_mtx, AuLsc_I_CHILD);
13257 + rerr = au_diropq_remove(dentry, bindex);
13258 + mutex_unlock(h_mtx);
13260 + AuIOErr("%.*s reverting diropq failed(%d, %d)\n",
13261 + AuDLNPair(dentry), err, rerr);
13267 + AuLabel(revert dir);
13268 + rerr = vfsub_rmdir(au_pinned_h_dir(&a->pin), &h_path);
13270 + AuIOErr("%.*s reverting dir failed(%d, %d)\n",
13271 + AuDLNPair(dentry), err, rerr);
13275 + au_dtime_revert(&a->dt);
13277 + au_unpin(&a->pin);
13280 + if (unlikely(err)) {
13281 + au_update_dbstart(dentry);
13284 + di_write_unlock(parent);
13285 + aufs_read_unlock(dentry, AuLock_DW);
13290 diff --git a/fs/aufs/i_op_del.c b/fs/aufs/i_op_del.c
13291 new file mode 100644
13292 index 0000000..d47ddfb
13294 +++ b/fs/aufs/i_op_del.c
13297 + * Copyright (C) 2005-2009 Junjiro R. Okajima
13299 + * This program, aufs is free software; you can redistribute it and/or modify
13300 + * it under the terms of the GNU General Public License as published by
13301 + * the Free Software Foundation; either version 2 of the License, or
13302 + * (at your option) any later version.
13304 + * This program is distributed in the hope that it will be useful,
13305 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
13306 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13307 + * GNU General Public License for more details.
13309 + * You should have received a copy of the GNU General Public License
13310 + * along with this program; if not, write to the Free Software
13311 + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
13315 + * inode operations (del entry)
13321 + * decide if a new whiteout for @dentry is necessary or not.
13322 + * when it is necessary, prepare the parent dir for the upper branch whose
13323 + * branch index is @bcpup for creation. the actual creation of the whiteout will
13324 + * be done by caller.
13326 + * 0: wh is unnecessary
13327 + * plus: wh is necessary
13330 +int au_wr_dir_need_wh(struct dentry *dentry, int isdir, aufs_bindex_t *bcpup)
13332 + int need_wh, err;
13333 + aufs_bindex_t bstart;
13334 + struct super_block *sb;
13336 + sb = dentry->d_sb;
13337 + bstart = au_dbstart(dentry);
13338 + if (*bcpup < 0) {
13340 + if (au_test_ro(sb, bstart, dentry->d_inode)) {
13341 + err = AuWbrCopyup(au_sbi(sb), dentry);
13343 + if (unlikely(err < 0))
13347 + AuDebugOn(bstart < *bcpup
13348 + || au_test_ro(sb, *bcpup, dentry->d_inode));
13349 + AuDbg("bcpup %d, bstart %d\n", *bcpup, bstart);
13351 + if (*bcpup != bstart) {
13352 + err = au_cpup_dirs(dentry, *bcpup);
13353 + if (unlikely(err))
13357 + aufs_bindex_t old_bend, new_bend, bdiropq = -1;
13359 + old_bend = au_dbend(dentry);
13361 + bdiropq = au_dbdiropq(dentry);
13362 + au_set_dbdiropq(dentry, -1);
13364 + need_wh = au_lkup_dentry(dentry, bstart + 1, /*type*/0,
13368 + au_set_dbdiropq(dentry, bdiropq);
13369 + if (unlikely(err < 0))
13371 + new_bend = au_dbend(dentry);
13372 + if (!need_wh && old_bend != new_bend) {
13373 + au_set_h_dptr(dentry, new_bend, NULL);
13374 + au_set_dbend(dentry, old_bend);
13377 + AuDbg("need_wh %d\n", need_wh);
13385 + * simple tests for the del-entry operations.
13386 + * following the checks in vfs, plus the parent-child relationship.
13388 +int au_may_del(struct dentry *dentry, aufs_bindex_t bindex,
13389 + struct dentry *h_parent, int isdir)
13393 + struct dentry *h_dentry, *h_latest;
13394 + struct inode *h_inode;
13396 + h_dentry = au_h_dptr(dentry, bindex);
13397 + h_inode = h_dentry->d_inode;
13398 + if (dentry->d_inode) {
13400 + if (unlikely(!h_inode || !h_inode->i_nlink))
13403 + h_mode = h_inode->i_mode;
13406 + if (unlikely(S_ISDIR(h_mode)))
13408 + } else if (unlikely(!S_ISDIR(h_mode))) {
13413 + /* rename(2) case */
13415 + if (unlikely(h_inode))
13420 + /* expected parent dir is locked */
13421 + if (unlikely(h_parent != h_dentry->d_parent))
13426 + * rmdir a dir may break the consistency on some filesystem.
13427 + * let's try heavy test.
13430 + if (unlikely(au_test_h_perm(h_parent->d_inode, MAY_EXEC | MAY_WRITE)))
13433 + h_latest = au_sio_lkup_one(&dentry->d_name, h_parent,
13434 + au_sbr(dentry->d_sb, bindex));
13436 + if (IS_ERR(h_latest))
13438 + if (h_latest == h_dentry)
13447 + * decide the branch where we operate for @dentry. the branch index will be set
13448 + * @rbcpup. after diciding it, 'pin' it and store the timestamps of the parent
13449 + * dir for reverting.
13450 + * when a new whiteout is necessary, create it.
13452 +static struct dentry*
13453 +lock_hdir_create_wh(struct dentry *dentry, int isdir, aufs_bindex_t *rbcpup,
13454 + struct au_dtime *dt, struct au_pin *pin)
13456 + struct dentry *wh_dentry;
13457 + struct super_block *sb;
13458 + struct path h_path;
13459 + int err, need_wh;
13460 + unsigned int udba;
13461 + aufs_bindex_t bcpup;
13463 + need_wh = au_wr_dir_need_wh(dentry, isdir, rbcpup);
13464 + wh_dentry = ERR_PTR(need_wh);
13465 + if (unlikely(need_wh < 0))
13468 + sb = dentry->d_sb;
13469 + udba = au_opt_udba(sb);
13471 + err = au_pin(pin, dentry, bcpup, udba,
13472 + AuPin_DI_LOCKED | AuPin_MNT_WRITE);
13473 + wh_dentry = ERR_PTR(err);
13474 + if (unlikely(err))
13477 + h_path.dentry = au_pinned_h_parent(pin);
13478 + if (udba != AuOpt_UDBA_NONE
13479 + && au_dbstart(dentry) == bcpup) {
13480 + err = au_may_del(dentry, bcpup, h_path.dentry, isdir);
13481 + wh_dentry = ERR_PTR(err);
13482 + if (unlikely(err))
13486 + h_path.mnt = au_sbr_mnt(sb, bcpup);
13487 + au_dtime_store(dt, au_pinned_parent(pin), &h_path);
13488 + wh_dentry = NULL;
13490 + goto out; /* success, no need to create whiteout */
13492 + wh_dentry = au_wh_create(dentry, bcpup, h_path.dentry);
13493 + if (!IS_ERR(wh_dentry))
13494 + goto out; /* success */
13495 + /* returns with the parent is locked and wh_dentry is dget-ed */
13500 + return wh_dentry;
13504 + * when removing a dir, rename it to a unique temporary whiteout-ed name first
13505 + * in order to be revertible and save time for removing many child whiteouts
13507 + * returns 1 when there are too many child whiteout and caller should remove
13508 + * them asynchronously. returns 0 when the number of children is enough small to
13509 + * remove now or the branch fs is a remote fs.
13510 + * otherwise return an error.
13512 +static int renwh_and_rmdir(struct dentry *dentry, aufs_bindex_t bindex,
13513 + struct au_nhash *whlist, struct inode *dir)
13515 + int rmdir_later, err, dirwh;
13516 + struct dentry *h_dentry;
13517 + struct super_block *sb;
13519 + sb = dentry->d_sb;
13520 + SiMustAnyLock(sb);
13521 + h_dentry = au_h_dptr(dentry, bindex);
13522 + err = au_whtmp_ren(h_dentry, au_sbr(sb, bindex));
13523 + if (unlikely(err))
13526 + /* stop monitoring */
13527 + au_hin_free(au_hi(dentry->d_inode, bindex));
13529 + if (!au_test_fs_remote(h_dentry->d_sb)) {
13530 + dirwh = au_sbi(sb)->si_dirwh;
13531 + rmdir_later = (dirwh <= 1);
13532 + if (!rmdir_later)
13533 + rmdir_later = au_nhash_test_longer_wh(whlist, bindex,
13536 + return rmdir_later;
13539 + err = au_whtmp_rmdir(dir, bindex, h_dentry, whlist);
13540 + if (unlikely(err)) {
13541 + AuIOErr("rmdir %.*s, b%d failed, %d. ignored\n",
13542 + AuDLNPair(h_dentry), bindex, err);
13552 + * final procedure for deleting a entry.
13553 + * maintain dentry and iattr.
13555 +static void epilog(struct inode *dir, struct dentry *dentry,
13556 + aufs_bindex_t bindex)
13558 + struct inode *inode;
13560 + inode = dentry->d_inode;
13562 + inode->i_ctime = dir->i_ctime;
13564 + if (atomic_read(&dentry->d_count) == 1) {
13565 + au_set_h_dptr(dentry, au_dbstart(dentry), NULL);
13566 + au_update_dbstart(dentry);
13568 + if (au_ibstart(dir) == bindex)
13569 + au_cpup_attr_timesizes(dir);
13570 + dir->i_version++;
13574 + * when an error happened, remove the created whiteout and revert everything.
13576 +static int do_revert(int err, struct inode *dir, aufs_bindex_t bwh,
13577 + struct dentry *wh_dentry, struct dentry *dentry,
13578 + struct au_dtime *dt)
13581 + struct path h_path = {
13582 + .dentry = wh_dentry,
13583 + .mnt = au_sbr_mnt(dir->i_sb, bwh)
13586 + rerr = au_wh_unlink_dentry(au_h_iptr(dir, bwh), &h_path, dentry);
13588 + au_set_dbwh(dentry, bwh);
13589 + au_dtime_revert(dt);
13593 + AuIOErr("%.*s reverting whiteout failed(%d, %d)\n",
13594 + AuDLNPair(dentry), err, rerr);
13598 +/* ---------------------------------------------------------------------- */
13600 +int aufs_unlink(struct inode *dir, struct dentry *dentry)
13603 + aufs_bindex_t bwh, bindex, bstart;
13604 + struct au_dtime dt;
13605 + struct au_pin pin;
13606 + struct path h_path;
13607 + struct inode *inode, *h_dir;
13608 + struct dentry *parent, *wh_dentry;
13611 + inode = dentry->d_inode;
13612 + if (unlikely(!inode))
13613 + return -ENOENT; /* possible? */
13614 + IMustLock(inode);
13616 + aufs_read_lock(dentry, AuLock_DW);
13617 + parent = dentry->d_parent; /* dir inode is locked */
13618 + di_write_lock_parent(parent);
13620 + bstart = au_dbstart(dentry);
13621 + bwh = au_dbwh(dentry);
13623 + wh_dentry = lock_hdir_create_wh(dentry, /*isdir*/0, &bindex, &dt, &pin);
13624 + err = PTR_ERR(wh_dentry);
13625 + if (IS_ERR(wh_dentry))
13628 + h_path.mnt = au_sbr_mnt(dentry->d_sb, bstart);
13629 + h_path.dentry = au_h_dptr(dentry, bstart);
13630 + dget(h_path.dentry);
13631 + if (bindex == bstart) {
13632 + h_dir = au_pinned_h_dir(&pin);
13633 + err = vfsub_unlink(h_dir, &h_path, /*force*/0);
13635 + /* dir inode is locked */
13636 + h_dir = wh_dentry->d_parent->d_inode;
13637 + IMustLock(h_dir);
13642 + drop_nlink(inode);
13643 + epilog(dir, dentry, bindex);
13645 + /* update target timestamps */
13646 + if (bindex == bstart) {
13647 + vfsub_update_h_iattr(&h_path, /*did*/NULL); /*ignore*/
13648 + inode->i_ctime = h_path.dentry->d_inode->i_ctime;
13650 + /* todo: this timestamp may be reverted later */
13651 + inode->i_ctime = h_dir->i_ctime;
13652 + goto out_unlock; /* success */
13659 + rerr = do_revert(err, dir, bwh, wh_dentry, dentry, &dt);
13667 + dput(h_path.dentry);
13669 + di_write_unlock(parent);
13670 + aufs_read_unlock(dentry, AuLock_DW);
13674 +int aufs_rmdir(struct inode *dir, struct dentry *dentry)
13676 + int err, rmdir_later;
13677 + aufs_bindex_t bwh, bindex, bstart;
13678 + struct au_dtime dt;
13679 + struct au_pin pin;
13680 + struct inode *inode;
13681 + struct dentry *parent, *wh_dentry, *h_dentry;
13682 + struct au_whtmp_rmdir *args;
13685 + inode = dentry->d_inode;
13686 + err = -ENOENT; /* possible? */
13687 + if (unlikely(!inode))
13689 + IMustLock(inode);
13691 + aufs_read_lock(dentry, AuLock_DW | AuLock_FLUSH);
13693 + args = au_whtmp_rmdir_alloc(dir->i_sb, GFP_NOFS);
13694 + if (unlikely(!args))
13697 + parent = dentry->d_parent; /* dir inode is locked */
13698 + di_write_lock_parent(parent);
13699 + err = au_test_empty(dentry, &args->whlist);
13700 + if (unlikely(err))
13703 + bstart = au_dbstart(dentry);
13704 + bwh = au_dbwh(dentry);
13706 + wh_dentry = lock_hdir_create_wh(dentry, /*isdir*/1, &bindex, &dt, &pin);
13707 + err = PTR_ERR(wh_dentry);
13708 + if (IS_ERR(wh_dentry))
13711 + h_dentry = au_h_dptr(dentry, bstart);
13714 + if (bindex == bstart) {
13715 + err = renwh_and_rmdir(dentry, bstart, &args->whlist, dir);
13717 + rmdir_later = err;
13721 + /* stop monitoring */
13722 + au_hin_free(au_hi(inode, bstart));
13724 + /* dir inode is locked */
13725 + IMustLock(wh_dentry->d_parent->d_inode);
13730 + clear_nlink(inode);
13731 + au_set_dbdiropq(dentry, -1);
13732 + epilog(dir, dentry, bindex);
13734 + if (rmdir_later) {
13735 + au_whtmp_kick_rmdir(dir, bstart, h_dentry, args);
13739 + goto out_unpin; /* success */
13747 + rerr = do_revert(err, dir, bwh, wh_dentry, dentry, &dt);
13757 + di_write_unlock(parent);
13759 + au_whtmp_rmdir_free(args);
13761 + aufs_read_unlock(dentry, AuLock_DW);
13766 diff --git a/fs/aufs/i_op_ren.c b/fs/aufs/i_op_ren.c
13767 new file mode 100644
13768 index 0000000..e7b2402
13770 +++ b/fs/aufs/i_op_ren.c
13773 + * Copyright (C) 2005-2009 Junjiro R. Okajima
13775 + * This program, aufs is free software; you can redistribute it and/or modify
13776 + * it under the terms of the GNU General Public License as published by
13777 + * the Free Software Foundation; either version 2 of the License, or
13778 + * (at your option) any later version.
13780 + * This program is distributed in the hope that it will be useful,
13781 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
13782 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13783 + * GNU General Public License for more details.
13785 + * You should have received a copy of the GNU General Public License
13786 + * along with this program; if not, write to the Free Software
13787 + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
13791 + * inode operation (rename entry)
13792 + * todo: this is crazy monster
13797 +enum { AuSRC, AuDST, AuSrcDst };
13798 +enum { AuPARENT, AuCHILD, AuParentChild };
13800 +#define AuRen_ISDIR 1
13801 +#define AuRen_ISSAMEDIR (1 << 1)
13802 +#define AuRen_WHSRC (1 << 2)
13803 +#define AuRen_WHDST (1 << 3)
13804 +#define AuRen_MNT_WRITE (1 << 4)
13805 +#define AuRen_DT_DSTDIR (1 << 5)
13806 +#define AuRen_DIROPQ (1 << 6)
13807 +#define AuRen_CPUP (1 << 7)
13808 +#define au_ftest_ren(flags, name) ((flags) & AuRen_##name)
13809 +#define au_fset_ren(flags, name) { (flags) |= AuRen_##name; }
13810 +#define au_fclr_ren(flags, name) { (flags) &= ~AuRen_##name; }
13812 +struct au_ren_args {
13814 + struct dentry *dentry, *h_dentry, *parent, *h_parent,
13816 + struct inode *dir, *inode;
13817 + struct au_hinode *hdir;
13818 + struct au_dtime dt[AuParentChild];
13819 + aufs_bindex_t bstart;
13822 +#define src_dentry sd[AuSRC].dentry
13823 +#define src_dir sd[AuSRC].dir
13824 +#define src_inode sd[AuSRC].inode
13825 +#define src_h_dentry sd[AuSRC].h_dentry
13826 +#define src_parent sd[AuSRC].parent
13827 +#define src_h_parent sd[AuSRC].h_parent
13828 +#define src_wh_dentry sd[AuSRC].wh_dentry
13829 +#define src_hdir sd[AuSRC].hdir
13830 +#define src_h_dir sd[AuSRC].hdir->hi_inode
13831 +#define src_dt sd[AuSRC].dt
13832 +#define src_bstart sd[AuSRC].bstart
13834 +#define dst_dentry sd[AuDST].dentry
13835 +#define dst_dir sd[AuDST].dir
13836 +#define dst_inode sd[AuDST].inode
13837 +#define dst_h_dentry sd[AuDST].h_dentry
13838 +#define dst_parent sd[AuDST].parent
13839 +#define dst_h_parent sd[AuDST].h_parent
13840 +#define dst_wh_dentry sd[AuDST].wh_dentry
13841 +#define dst_hdir sd[AuDST].hdir
13842 +#define dst_h_dir sd[AuDST].hdir->hi_inode
13843 +#define dst_dt sd[AuDST].dt
13844 +#define dst_bstart sd[AuDST].bstart
13846 + struct dentry *h_trap;
13847 + struct au_branch *br;
13848 + struct au_hinode *src_hinode;
13849 + struct path h_path;
13850 + struct au_nhash whlist;
13851 + aufs_bindex_t btgt;
13853 + unsigned int flags;
13855 + struct au_whtmp_rmdir *thargs;
13856 + struct dentry *h_dst;
13859 +/* ---------------------------------------------------------------------- */
13862 + * functions for reverting.
13863 + * when an error happened in a single rename systemcall, we should revert
13864 + * everything as if nothing happend.
13865 + * we don't need to revert the copied-up/down the parent dir since they are
13869 +#define RevertFailure(fmt, ...) do { \
13870 + AuIOErr("revert failure: " fmt " (%d, %d)\n", \
13871 + ##__VA_ARGS__, err, rerr); \
13875 +static void au_ren_rev_diropq(int err, struct au_ren_args *a)
13879 + au_hin_imtx_lock_nested(a->src_hinode, AuLsc_I_CHILD);
13880 + rerr = au_diropq_remove(a->src_dentry, a->btgt);
13881 + au_hin_imtx_unlock(a->src_hinode);
13883 + RevertFailure("remove diropq %.*s", AuDLNPair(a->src_dentry));
13887 +static void au_ren_rev_rename(int err, struct au_ren_args *a)
13891 + a->h_path.dentry = au_lkup_one(&a->src_dentry->d_name, a->src_h_parent,
13892 + a->br, /*nd*/NULL);
13893 + rerr = PTR_ERR(a->h_path.dentry);
13894 + if (IS_ERR(a->h_path.dentry)) {
13895 + RevertFailure("au_lkup_one %.*s", AuDLNPair(a->src_dentry));
13899 + rerr = vfsub_rename(a->dst_h_dir,
13900 + au_h_dptr(a->src_dentry, a->btgt),
13901 + a->src_h_dir, &a->h_path);
13902 + d_drop(a->h_path.dentry);
13903 + dput(a->h_path.dentry);
13904 + /* au_set_h_dptr(a->src_dentry, a->btgt, NULL); */
13906 + RevertFailure("rename %.*s", AuDLNPair(a->src_dentry));
13909 +static void au_ren_rev_cpup(int err, struct au_ren_args *a)
13913 + a->h_path.dentry = a->dst_h_dentry;
13914 + rerr = vfsub_unlink(a->dst_h_dir, &a->h_path, /*force*/0);
13915 + au_set_h_dptr(a->src_dentry, a->btgt, NULL);
13916 + au_set_dbstart(a->src_dentry, a->src_bstart);
13918 + RevertFailure("unlink %.*s", AuDLNPair(a->dst_h_dentry));
13922 +static void au_ren_rev_whtmp(int err, struct au_ren_args *a)
13926 + a->h_path.dentry = au_lkup_one(&a->dst_dentry->d_name, a->dst_h_parent,
13927 + a->br, /*nd*/NULL);
13928 + rerr = PTR_ERR(a->h_path.dentry);
13929 + if (IS_ERR(a->h_path.dentry)) {
13930 + RevertFailure("lookup %.*s", AuDLNPair(a->dst_dentry));
13933 + if (a->h_path.dentry->d_inode) {
13934 + d_drop(a->h_path.dentry);
13935 + dput(a->h_path.dentry);
13939 + rerr = vfsub_rename(a->dst_h_dir, a->h_dst, a->dst_h_dir, &a->h_path);
13940 + d_drop(a->h_path.dentry);
13941 + dput(a->h_path.dentry);
13943 + au_set_h_dptr(a->dst_dentry, a->btgt, NULL);
13944 + au_set_h_dptr(a->dst_dentry, a->btgt, dget(a->h_dst));
13946 + RevertFailure("rename %.*s", AuDLNPair(a->h_dst));
13949 +static void au_ren_rev_whsrc(int err, struct au_ren_args *a)
13953 + a->h_path.dentry = a->src_wh_dentry;
13954 + rerr = au_wh_unlink_dentry(a->src_h_dir, &a->h_path, a->src_dentry);
13956 + RevertFailure("unlink %.*s", AuDLNPair(a->src_wh_dentry));
13959 +static void au_ren_rev_drop(struct au_ren_args *a)
13961 + struct dentry *d, *h_d;
13963 + aufs_bindex_t bend, bindex;
13965 + for (i = 0; i < AuSrcDst; i++) {
13966 + d = a->sd[i].dentry;
13968 + bend = au_dbend(d);
13969 + for (bindex = au_dbstart(d); bindex <= bend; bindex++) {
13970 + h_d = au_h_dptr(d, bindex);
13976 + au_update_dbstart(a->dst_dentry);
13978 + d_drop(a->h_dst);
13980 +#undef RevertFailure
13982 +/* ---------------------------------------------------------------------- */
13985 + * when we have to copyup the renaming entry, do it with the rename-target name
13986 + * in order to minimize the cost (the later actual rename is unnecessary).
13987 + * otherwise rename it on the target branch.
13989 +static int au_ren_or_cpup(struct au_ren_args *a)
13992 + struct dentry *d;
13994 + d = a->src_dentry;
13995 + if (au_dbstart(d) == a->btgt) {
13996 + a->h_path.dentry = a->dst_h_dentry;
13997 + if (au_ftest_ren(a->flags, DIROPQ)
13998 + && au_dbdiropq(d) == a->btgt)
13999 + au_fclr_ren(a->flags, DIROPQ);
14000 + AuDebugOn(au_dbstart(d) != a->btgt);
14001 + err = vfsub_rename(a->src_h_dir, au_h_dptr(d, a->btgt),
14002 + a->dst_h_dir, &a->h_path);
14004 + struct mutex *h_mtx = &a->src_h_dentry->d_inode->i_mutex;
14006 + au_fset_ren(a->flags, CPUP);
14007 + mutex_lock_nested(h_mtx, AuLsc_I_CHILD);
14008 + au_set_dbstart(d, a->btgt);
14009 + au_set_h_dptr(d, a->btgt, dget(a->dst_h_dentry));
14010 + err = au_sio_cpup_single(d, a->btgt, a->src_bstart, -1,
14011 + !AuCpup_DTIME, a->dst_parent);
14012 + mutex_unlock(h_mtx);
14014 + d = a->dst_dentry;
14015 + au_set_h_dptr(d, a->btgt, NULL);
14016 + au_update_dbstart(d);
14018 + au_set_h_dptr(d, a->btgt, NULL);
14019 + au_set_dbstart(d, a->src_bstart);
14026 +/* cf. aufs_rmdir() */
14027 +static int au_ren_del_whtmp(struct au_ren_args *a)
14030 + struct inode *dir;
14032 + dir = a->dst_dir;
14033 + SiMustAnyLock(dir->i_sb);
14034 + if (!au_nhash_test_longer_wh(&a->whlist, a->btgt,
14035 + au_sbi(dir->i_sb)->si_dirwh)
14036 + || au_test_fs_remote(a->h_dst->d_sb)) {
14037 + err = au_whtmp_rmdir(dir, a->btgt, a->h_dst, &a->whlist);
14038 + if (unlikely(err))
14039 + AuWarn("failed removing whtmp dir %.*s (%d), "
14040 + "ignored.\n", AuDLNPair(a->h_dst), err);
14042 + au_nhash_wh_free(&a->thargs->whlist);
14043 + a->thargs->whlist = a->whlist;
14044 + a->whlist.nh_num = 0;
14045 + au_whtmp_kick_rmdir(dir, a->btgt, a->h_dst, a->thargs);
14047 + a->thargs = NULL;
14053 +/* make it 'opaque' dir. */
14054 +static int au_ren_diropq(struct au_ren_args *a)
14057 + struct dentry *diropq;
14060 + a->src_hinode = au_hi(a->src_inode, a->btgt);
14061 + au_hin_imtx_lock_nested(a->src_hinode, AuLsc_I_CHILD);
14062 + diropq = au_diropq_create(a->src_dentry, a->btgt);
14063 + au_hin_imtx_unlock(a->src_hinode);
14064 + if (IS_ERR(diropq))
14065 + err = PTR_ERR(diropq);
14071 +static int do_rename(struct au_ren_args *a)
14074 + struct dentry *d, *h_d;
14076 + /* prepare workqueue args for asynchronous rmdir */
14077 + h_d = a->dst_h_dentry;
14078 + if (au_ftest_ren(a->flags, ISDIR) && h_d->d_inode) {
14080 + a->thargs = au_whtmp_rmdir_alloc(a->src_dentry->d_sb, GFP_NOFS);
14081 + if (unlikely(!a->thargs))
14083 + a->h_dst = dget(h_d);
14086 + /* create whiteout for src_dentry */
14087 + if (au_ftest_ren(a->flags, WHSRC)) {
14089 + = au_wh_create(a->src_dentry, a->btgt, a->src_h_parent);
14090 + err = PTR_ERR(a->src_wh_dentry);
14091 + if (IS_ERR(a->src_wh_dentry))
14095 + /* lookup whiteout for dentry */
14096 + if (au_ftest_ren(a->flags, WHDST)) {
14097 + h_d = au_wh_lkup(a->dst_h_parent, &a->dst_dentry->d_name,
14099 + err = PTR_ERR(h_d);
14102 + if (!h_d->d_inode)
14105 + a->dst_wh_dentry = h_d;
14108 + /* rename dentry to tmpwh */
14110 + err = au_whtmp_ren(a->dst_h_dentry, a->br);
14111 + if (unlikely(err))
14114 + d = a->dst_dentry;
14115 + au_set_h_dptr(d, a->btgt, NULL);
14116 + err = au_lkup_neg(d, a->btgt);
14117 + if (unlikely(err))
14119 + a->dst_h_dentry = au_h_dptr(d, a->btgt);
14123 + if (a->dst_h_dentry->d_inode && a->src_bstart != a->btgt) {
14124 + struct mutex *h_mtx = &a->src_h_dentry->d_inode->i_mutex;
14126 + mutex_lock_nested(h_mtx, AuLsc_I_CHILD);
14127 + err = au_sio_cpup_simple(a->src_dentry, a->btgt, -1,
14129 + mutex_unlock(h_mtx);
14130 + if (unlikely(err))
14134 + /* rename by vfs_rename or cpup */
14135 + d = a->dst_dentry;
14136 + if (au_ftest_ren(a->flags, ISDIR)
14137 + && (a->dst_wh_dentry
14138 + || au_dbdiropq(d) == a->btgt
14139 + /* hide the lower to keep xino */
14140 + || a->btgt < au_dbend(d)
14141 + || au_opt_test(au_mntflags(d->d_sb), ALWAYS_DIROPQ)))
14142 + au_fset_ren(a->flags, DIROPQ);
14143 + err = au_ren_or_cpup(a);
14144 + if (unlikely(err))
14145 + /* leave the copied-up one */
14148 + /* make dir opaque */
14149 + if (au_ftest_ren(a->flags, DIROPQ)) {
14150 + err = au_ren_diropq(a);
14151 + if (unlikely(err))
14155 + /* update target timestamps */
14156 + AuDebugOn(au_dbstart(a->src_dentry) != a->btgt);
14157 + a->h_path.dentry = au_h_dptr(a->src_dentry, a->btgt);
14158 + vfsub_update_h_iattr(&a->h_path, /*did*/NULL); /*ignore*/
14159 + a->src_inode->i_ctime = a->h_path.dentry->d_inode->i_ctime;
14161 + /* remove whiteout for dentry */
14162 + if (a->dst_wh_dentry) {
14163 + a->h_path.dentry = a->dst_wh_dentry;
14164 + err = au_wh_unlink_dentry(a->dst_h_dir, &a->h_path,
14166 + if (unlikely(err))
14170 + /* remove whtmp */
14172 + au_ren_del_whtmp(a); /* ignore this error */
14175 + goto out_success;
14178 + if (au_ftest_ren(a->flags, DIROPQ))
14179 + au_ren_rev_diropq(err, a);
14181 + if (!au_ftest_ren(a->flags, CPUP))
14182 + au_ren_rev_rename(err, a);
14184 + au_ren_rev_cpup(err, a);
14187 + au_ren_rev_whtmp(err, a);
14189 + dput(a->dst_wh_dentry);
14190 + a->dst_wh_dentry = NULL;
14192 + if (a->src_wh_dentry)
14193 + au_ren_rev_whsrc(err, a);
14194 + au_ren_rev_drop(a);
14196 + dput(a->src_wh_dentry);
14197 + dput(a->dst_wh_dentry);
14201 + au_whtmp_rmdir_free(a->thargs);
14202 + a->thargs = NULL;
14208 +/* ---------------------------------------------------------------------- */
14211 + * test if @dentry dir can be rename destination or not.
14212 + * success means, it is a logically empty dir.
14214 +static int may_rename_dstdir(struct dentry *dentry, struct au_nhash *whlist)
14216 + return au_test_empty(dentry, whlist);
14220 + * test if @dentry dir can be rename source or not.
14221 + * if it can, return 0 and @children is filled.
14223 + * - it is a logically empty dir.
14224 + * - or, it exists on writable branch and has no children including whiteouts
14225 + * on the lower branch.
14227 +static int may_rename_srcdir(struct dentry *dentry, aufs_bindex_t btgt)
14230 + unsigned int rdhash;
14231 + aufs_bindex_t bstart;
14233 + bstart = au_dbstart(dentry);
14234 + if (bstart != btgt) {
14235 + struct au_nhash whlist;
14237 + SiMustAnyLock(dentry->d_sb);
14238 + rdhash = au_sbi(dentry->d_sb)->si_rdhash;
14240 + rdhash = au_rdhash_est(au_dir_size(/*file*/NULL,
14242 + err = au_nhash_alloc(&whlist, rdhash, GFP_NOFS);
14243 + if (unlikely(err))
14245 + err = au_test_empty(dentry, &whlist);
14246 + au_nhash_wh_free(&whlist);
14250 + if (bstart == au_dbtaildir(dentry))
14251 + return 0; /* success */
14253 + err = au_test_empty_lower(dentry);
14256 + if (err == -ENOTEMPTY) {
14257 + AuWarn1("renaming dir who has child(ren) on multiple branches,"
14258 + " is not supported\n");
14264 +/* side effect: sets whlist and h_dentry */
14265 +static int au_ren_may_dir(struct au_ren_args *a)
14268 + unsigned int rdhash;
14269 + struct dentry *d;
14271 + d = a->dst_dentry;
14272 + SiMustAnyLock(d->d_sb);
14275 + if (au_ftest_ren(a->flags, ISDIR) && a->dst_inode) {
14276 + rdhash = au_sbi(d->d_sb)->si_rdhash;
14278 + rdhash = au_rdhash_est(au_dir_size(/*file*/NULL, d));
14279 + err = au_nhash_alloc(&a->whlist, rdhash, GFP_NOFS);
14280 + if (unlikely(err))
14283 + au_set_dbstart(d, a->dst_bstart);
14284 + err = may_rename_dstdir(d, &a->whlist);
14285 + au_set_dbstart(d, a->btgt);
14287 + a->dst_h_dentry = au_h_dptr(d, au_dbstart(d));
14288 + if (unlikely(err))
14291 + d = a->src_dentry;
14292 + a->src_h_dentry = au_h_dptr(d, au_dbstart(d));
14293 + if (au_ftest_ren(a->flags, ISDIR)) {
14294 + err = may_rename_srcdir(d, a->btgt);
14295 + if (unlikely(err)) {
14296 + au_nhash_wh_free(&a->whlist);
14297 + a->whlist.nh_num = 0;
14304 +/* ---------------------------------------------------------------------- */
14307 + * simple tests for rename.
14308 + * following the checks in vfs, plus the parent-child relationship.
14310 +static int au_may_ren(struct au_ren_args *a)
14313 + struct inode *h_inode;
14315 + if (a->src_bstart == a->btgt) {
14316 + err = au_may_del(a->src_dentry, a->btgt, a->src_h_parent,
14317 + au_ftest_ren(a->flags, ISDIR));
14318 + if (unlikely(err))
14321 + if (unlikely(a->src_h_dentry == a->h_trap))
14326 + if (a->dst_bstart != a->btgt)
14330 + h_inode = a->dst_h_dentry->d_inode;
14331 + isdir = !!au_ftest_ren(a->flags, ISDIR);
14332 + if (!a->dst_dentry->d_inode) {
14333 + if (unlikely(h_inode))
14335 + err = au_may_add(a->dst_dentry, a->btgt, a->dst_h_parent,
14338 + if (unlikely(!h_inode || !h_inode->i_nlink))
14340 + err = au_may_del(a->dst_dentry, a->btgt, a->dst_h_parent,
14342 + if (unlikely(err))
14344 + err = -ENOTEMPTY;
14345 + if (unlikely(a->dst_h_dentry == a->h_trap))
14351 + if (unlikely(err == -ENOENT || err == -EEXIST))
14357 +/* ---------------------------------------------------------------------- */
14362 + * - src_dir and dir by lock_rename()
14363 + * - inode if exitsts
14366 + * + src_dentry and dentry by aufs_read_and_write_lock2() which calls,
14368 + * + di_write_lock2_child()
14369 + * + di_write_lock_child()
14370 + * + ii_write_lock_child()
14371 + * + di_write_lock_child2()
14372 + * + ii_write_lock_child2()
14373 + * + src_parent and parent
14374 + * + di_write_lock_parent()
14375 + * + ii_write_lock_parent()
14376 + * + di_write_lock_parent2()
14377 + * + ii_write_lock_parent2()
14378 + * + lower src_dir and dir by vfsub_lock_rename()
14379 + * + verify the every relationships between child and parent. if any
14380 + * of them failed, unlock all and return -EBUSY.
14382 +static void au_ren_unlock(struct au_ren_args *a)
14384 + struct super_block *sb;
14386 + sb = a->dst_dentry->d_sb;
14387 + if (au_ftest_ren(a->flags, MNT_WRITE))
14388 + mnt_drop_write(a->br->br_mnt);
14389 + vfsub_unlock_rename(a->src_h_parent, a->src_hdir,
14390 + a->dst_h_parent, a->dst_hdir);
14393 +static int au_ren_lock(struct au_ren_args *a)
14396 + unsigned int udba;
14399 + a->src_h_parent = au_h_dptr(a->src_parent, a->btgt);
14400 + a->src_hdir = au_hi(a->src_dir, a->btgt);
14401 + a->dst_h_parent = au_h_dptr(a->dst_parent, a->btgt);
14402 + a->dst_hdir = au_hi(a->dst_dir, a->btgt);
14403 + a->h_trap = vfsub_lock_rename(a->src_h_parent, a->src_hdir,
14404 + a->dst_h_parent, a->dst_hdir);
14405 + udba = au_opt_udba(a->src_dentry->d_sb);
14406 + if (unlikely(a->src_hdir->hi_inode != a->src_h_parent->d_inode
14407 + || a->dst_hdir->hi_inode != a->dst_h_parent->d_inode))
14408 + err = au_busy_or_stale();
14409 + if (!err && au_dbstart(a->src_dentry) == a->btgt)
14410 + err = au_h_verify(a->src_h_dentry, udba,
14411 + a->src_h_parent->d_inode, a->src_h_parent,
14413 + if (!err && au_dbstart(a->dst_dentry) == a->btgt)
14414 + err = au_h_verify(a->dst_h_dentry, udba,
14415 + a->dst_h_parent->d_inode, a->dst_h_parent,
14418 + err = mnt_want_write(a->br->br_mnt);
14419 + if (unlikely(err))
14421 + au_fset_ren(a->flags, MNT_WRITE);
14422 + goto out; /* success */
14425 + err = au_busy_or_stale();
14428 + au_ren_unlock(a);
14433 +/* ---------------------------------------------------------------------- */
14435 +static void au_ren_refresh_dir(struct au_ren_args *a)
14437 + struct inode *dir;
14439 + dir = a->dst_dir;
14440 + dir->i_version++;
14441 + if (au_ftest_ren(a->flags, ISDIR)) {
14442 + /* is this updating defined in POSIX? */
14443 + au_cpup_attr_timesizes(a->src_inode);
14444 + au_cpup_attr_nlink(dir, /*force*/1);
14445 + if (a->dst_inode) {
14446 + clear_nlink(a->dst_inode);
14447 + au_cpup_attr_timesizes(a->dst_inode);
14450 + if (au_ibstart(dir) == a->btgt)
14451 + au_cpup_attr_timesizes(dir);
14453 + if (au_ftest_ren(a->flags, ISSAMEDIR))
14456 + dir = a->src_dir;
14457 + dir->i_version++;
14458 + if (au_ftest_ren(a->flags, ISDIR))
14459 + au_cpup_attr_nlink(dir, /*force*/1);
14460 + if (au_ibstart(dir) == a->btgt)
14461 + au_cpup_attr_timesizes(dir);
14464 +static void au_ren_refresh(struct au_ren_args *a)
14466 + aufs_bindex_t bend, bindex;
14467 + struct dentry *d, *h_d;
14468 + struct inode *i, *h_i;
14469 + struct super_block *sb;
14471 + d = a->src_dentry;
14472 + au_set_dbwh(d, -1);
14473 + bend = au_dbend(d);
14474 + for (bindex = a->btgt + 1; bindex <= bend; bindex++) {
14475 + h_d = au_h_dptr(d, bindex);
14477 + au_set_h_dptr(d, bindex, NULL);
14479 + au_set_dbend(d, a->btgt);
14482 + i = a->src_inode;
14483 + if (au_opt_test(au_mntflags(sb), PLINK) && au_plink_test(i))
14484 + return; /* success */
14486 + bend = au_ibend(i);
14487 + for (bindex = a->btgt + 1; bindex <= bend; bindex++) {
14488 + h_i = au_h_iptr(i, bindex);
14490 + au_xino_write(sb, bindex, h_i->i_ino, /*ino*/0);
14491 + /* ignore this error */
14492 + au_set_h_iptr(i, bindex, NULL, 0);
14495 + au_set_ibend(i, a->btgt);
14498 +/* ---------------------------------------------------------------------- */
14500 +/* mainly for link(2) and rename(2) */
14501 +int au_wbr(struct dentry *dentry, aufs_bindex_t btgt)
14503 + aufs_bindex_t bdiropq, bwh;
14504 + struct dentry *parent;
14505 + struct au_branch *br;
14507 + parent = dentry->d_parent;
14508 + IMustLock(parent->d_inode); /* dir is locked */
14510 + bdiropq = au_dbdiropq(parent);
14511 + bwh = au_dbwh(dentry);
14512 + br = au_sbr(dentry->d_sb, btgt);
14513 + if (au_br_rdonly(br)
14514 + || (0 <= bdiropq && bdiropq < btgt)
14515 + || (0 <= bwh && bwh < btgt))
14518 + AuDbg("btgt %d\n", btgt);
14522 +/* sets src_bstart, dst_bstart and btgt */
14523 +static int au_ren_wbr(struct au_ren_args *a)
14526 + struct au_wr_dir_args wr_dir_args = {
14527 + /* .force_btgt = -1, */
14528 + .flags = AuWrDir_ADD_ENTRY
14531 + a->src_bstart = au_dbstart(a->src_dentry);
14532 + a->dst_bstart = au_dbstart(a->dst_dentry);
14533 + if (au_ftest_ren(a->flags, ISDIR))
14534 + au_fset_wrdir(wr_dir_args.flags, ISDIR);
14535 + wr_dir_args.force_btgt = a->src_bstart;
14536 + if (a->dst_inode && a->dst_bstart < a->src_bstart)
14537 + wr_dir_args.force_btgt = a->dst_bstart;
14538 + wr_dir_args.force_btgt = au_wbr(a->dst_dentry, wr_dir_args.force_btgt);
14539 + err = au_wr_dir(a->dst_dentry, a->src_dentry, &wr_dir_args);
14545 +static void au_ren_dt(struct au_ren_args *a)
14547 + a->h_path.dentry = a->src_h_parent;
14548 + au_dtime_store(a->src_dt + AuPARENT, a->src_parent, &a->h_path);
14549 + if (!au_ftest_ren(a->flags, ISSAMEDIR)) {
14550 + a->h_path.dentry = a->dst_h_parent;
14551 + au_dtime_store(a->dst_dt + AuPARENT, a->dst_parent, &a->h_path);
14554 + au_fclr_ren(a->flags, DT_DSTDIR);
14555 + if (!au_ftest_ren(a->flags, ISDIR))
14558 + a->h_path.dentry = a->src_h_dentry;
14559 + au_dtime_store(a->src_dt + AuCHILD, a->src_dentry, &a->h_path);
14560 + if (a->dst_h_dentry->d_inode) {
14561 + au_fset_ren(a->flags, DT_DSTDIR);
14562 + a->h_path.dentry = a->dst_h_dentry;
14563 + au_dtime_store(a->dst_dt + AuCHILD, a->dst_dentry, &a->h_path);
14567 +static void au_ren_rev_dt(int err, struct au_ren_args *a)
14569 + struct dentry *h_d;
14570 + struct mutex *h_mtx;
14572 + au_dtime_revert(a->src_dt + AuPARENT);
14573 + if (!au_ftest_ren(a->flags, ISSAMEDIR))
14574 + au_dtime_revert(a->dst_dt + AuPARENT);
14576 + if (au_ftest_ren(a->flags, ISDIR) && err != -EIO) {
14577 + h_d = a->src_dt[AuCHILD].dt_h_path.dentry;
14578 + h_mtx = &h_d->d_inode->i_mutex;
14579 + mutex_lock_nested(h_mtx, AuLsc_I_CHILD);
14580 + au_dtime_revert(a->src_dt + AuCHILD);
14581 + mutex_unlock(h_mtx);
14583 + if (au_ftest_ren(a->flags, DT_DSTDIR)) {
14584 + h_d = a->dst_dt[AuCHILD].dt_h_path.dentry;
14585 + h_mtx = &h_d->d_inode->i_mutex;
14586 + mutex_lock_nested(h_mtx, AuLsc_I_CHILD);
14587 + au_dtime_revert(a->dst_dt + AuCHILD);
14588 + mutex_unlock(h_mtx);
14593 +/* ---------------------------------------------------------------------- */
14595 +int aufs_rename(struct inode *_src_dir, struct dentry *_src_dentry,
14596 + struct inode *_dst_dir, struct dentry *_dst_dentry)
14599 + /* reduce stack space */
14600 + struct au_ren_args *a;
14602 + AuDbg("%.*s, %.*s\n", AuDLNPair(_src_dentry), AuDLNPair(_dst_dentry));
14603 + IMustLock(_src_dir);
14604 + IMustLock(_dst_dir);
14607 + BUILD_BUG_ON(sizeof(*a) > PAGE_SIZE);
14608 + a = kzalloc(sizeof(*a), GFP_NOFS);
14609 + if (unlikely(!a))
14612 + a->src_dir = _src_dir;
14613 + a->src_dentry = _src_dentry;
14614 + a->src_inode = a->src_dentry->d_inode;
14615 + a->src_parent = a->src_dentry->d_parent; /* dir inode is locked */
14616 + a->dst_dir = _dst_dir;
14617 + a->dst_dentry = _dst_dentry;
14618 + a->dst_inode = a->dst_dentry->d_inode;
14619 + a->dst_parent = a->dst_dentry->d_parent; /* dir inode is locked */
14620 + if (a->dst_inode) {
14621 + IMustLock(a->dst_inode);
14622 + au_igrab(a->dst_inode);
14626 + if (S_ISDIR(a->src_inode->i_mode)) {
14627 + au_fset_ren(a->flags, ISDIR);
14628 + if (unlikely(a->dst_inode && !S_ISDIR(a->dst_inode->i_mode)))
14630 + aufs_read_and_write_lock2(a->dst_dentry, a->src_dentry,
14631 + AuLock_DIR | AuLock_FLUSH);
14633 + aufs_read_and_write_lock2(a->dst_dentry, a->src_dentry,
14636 + au_fset_ren(a->flags, ISSAMEDIR); /* temporary */
14637 + di_write_lock_parent(a->dst_parent);
14639 + /* which branch we process */
14640 + err = au_ren_wbr(a);
14641 + if (unlikely(err < 0))
14643 + a->br = au_sbr(a->dst_dentry->d_sb, a->btgt);
14644 + a->h_path.mnt = a->br->br_mnt;
14646 + /* are they available to be renamed */
14647 + err = au_ren_may_dir(a);
14648 + if (unlikely(err))
14649 + goto out_children;
14651 + /* prepare the writable parent dir on the same branch */
14652 + if (a->dst_bstart == a->btgt) {
14653 + au_fset_ren(a->flags, WHDST);
14655 + err = au_cpup_dirs(a->dst_dentry, a->btgt);
14656 + if (unlikely(err))
14657 + goto out_children;
14660 + if (a->src_dir != a->dst_dir) {
14662 + * this temporary unlock is safe,
14663 + * because both dir->i_mutex are locked.
14665 + di_write_unlock(a->dst_parent);
14666 + di_write_lock_parent(a->src_parent);
14667 + err = au_wr_dir_need_wh(a->src_dentry,
14668 + au_ftest_ren(a->flags, ISDIR),
14670 + di_write_unlock(a->src_parent);
14671 + di_write_lock2_parent(a->src_parent, a->dst_parent, /*isdir*/1);
14672 + au_fclr_ren(a->flags, ISSAMEDIR);
14674 + err = au_wr_dir_need_wh(a->src_dentry,
14675 + au_ftest_ren(a->flags, ISDIR),
14677 + if (unlikely(err < 0))
14678 + goto out_children;
14680 + au_fset_ren(a->flags, WHSRC);
14682 + /* lock them all */
14683 + err = au_ren_lock(a);
14684 + if (unlikely(err))
14685 + goto out_children;
14687 + if (!au_opt_test(au_mntflags(a->dst_dir->i_sb), UDBA_NONE))
14688 + err = au_may_ren(a);
14689 + else if (unlikely(a->dst_dentry->d_name.len > AUFS_MAX_NAMELEN))
14690 + err = -ENAMETOOLONG;
14691 + if (unlikely(err))
14694 + /* store timestamps to be revertible */
14698 + err = do_rename(a);
14699 + if (unlikely(err))
14702 + /* update dir attributes */
14703 + au_ren_refresh_dir(a);
14705 + /* dput/iput all lower dentries */
14706 + au_ren_refresh(a);
14708 + goto out_hdir; /* success */
14711 + au_ren_rev_dt(err, a);
14713 + au_ren_unlock(a);
14715 + au_nhash_wh_free(&a->whlist);
14717 + if (unlikely(err && au_ftest_ren(a->flags, ISDIR))) {
14718 + au_update_dbstart(a->dst_dentry);
14719 + d_drop(a->dst_dentry);
14722 + d_move(a->src_dentry, a->dst_dentry);
14723 + if (au_ftest_ren(a->flags, ISSAMEDIR))
14724 + di_write_unlock(a->dst_parent);
14726 + di_write_unlock2(a->src_parent, a->dst_parent);
14727 + aufs_read_and_write_unlock2(a->dst_dentry, a->src_dentry);
14729 + iput(a->dst_inode);
14731 + au_whtmp_rmdir_free(a->thargs);
14737 diff --git a/fs/aufs/iinfo.c b/fs/aufs/iinfo.c
14738 new file mode 100644
14739 index 0000000..072ddfc
14741 +++ b/fs/aufs/iinfo.c
14744 + * Copyright (C) 2005-2009 Junjiro R. Okajima
14746 + * This program, aufs is free software; you can redistribute it and/or modify
14747 + * it under the terms of the GNU General Public License as published by
14748 + * the Free Software Foundation; either version 2 of the License, or
14749 + * (at your option) any later version.
14751 + * This program is distributed in the hope that it will be useful,
14752 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
14753 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14754 + * GNU General Public License for more details.
14756 + * You should have received a copy of the GNU General Public License
14757 + * along with this program; if not, write to the Free Software
14758 + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
14762 + * inode private data
14767 +struct inode *au_h_iptr(struct inode *inode, aufs_bindex_t bindex)
14769 + struct inode *h_inode;
14771 + IiMustAnyLock(inode);
14773 + h_inode = au_ii(inode)->ii_hinode[0 + bindex].hi_inode;
14774 + AuDebugOn(h_inode && atomic_read(&h_inode->i_count) <= 0);
14778 +/* todo: hard/soft set? */
14779 +void au_set_ibstart(struct inode *inode, aufs_bindex_t bindex)
14781 + struct au_iinfo *iinfo = au_ii(inode);
14782 + struct inode *h_inode;
14784 + IiMustWriteLock(inode);
14786 + iinfo->ii_bstart = bindex;
14787 + h_inode = iinfo->ii_hinode[bindex + 0].hi_inode;
14789 + au_cpup_igen(inode, h_inode);
14792 +void au_hiput(struct au_hinode *hinode)
14794 + au_hin_free(hinode);
14795 + dput(hinode->hi_whdentry);
14796 + iput(hinode->hi_inode);
14799 +unsigned int au_hi_flags(struct inode *inode, int isdir)
14801 + unsigned int flags;
14802 + const unsigned int mnt_flags = au_mntflags(inode->i_sb);
14805 + if (au_opt_test(mnt_flags, XINO))
14806 + au_fset_hi(flags, XINO);
14807 + if (isdir && au_opt_test(mnt_flags, UDBA_HINOTIFY))
14808 + au_fset_hi(flags, HINOTIFY);
14812 +void au_set_h_iptr(struct inode *inode, aufs_bindex_t bindex,
14813 + struct inode *h_inode, unsigned int flags)
14815 + struct au_hinode *hinode;
14816 + struct inode *hi;
14817 + struct au_iinfo *iinfo = au_ii(inode);
14819 + IiMustWriteLock(inode);
14821 + hinode = iinfo->ii_hinode + bindex;
14822 + hi = hinode->hi_inode;
14823 + AuDebugOn(h_inode && atomic_read(&h_inode->i_count) <= 0);
14824 + AuDebugOn(h_inode && hi);
14827 + au_hiput(hinode);
14828 + hinode->hi_inode = h_inode;
14831 + struct super_block *sb = inode->i_sb;
14832 + struct au_branch *br;
14834 + if (bindex == iinfo->ii_bstart)
14835 + au_cpup_igen(inode, h_inode);
14836 + br = au_sbr(sb, bindex);
14837 + hinode->hi_id = br->br_id;
14838 + if (au_ftest_hi(flags, XINO)) {
14839 + err = au_xino_write(sb, bindex, h_inode->i_ino,
14841 + if (unlikely(err))
14842 + AuIOErr1("failed au_xino_write() %d\n", err);
14845 + if (au_ftest_hi(flags, HINOTIFY)
14846 + && au_br_hinotifyable(br->br_perm)) {
14847 + err = au_hin_alloc(hinode, inode, h_inode);
14848 + if (unlikely(err))
14849 + AuIOErr1("au_hin_alloc() %d\n", err);
14854 +void au_set_hi_wh(struct inode *inode, aufs_bindex_t bindex,
14855 + struct dentry *h_wh)
14857 + struct au_hinode *hinode;
14859 + IiMustWriteLock(inode);
14861 + hinode = au_ii(inode)->ii_hinode + bindex;
14862 + AuDebugOn(hinode->hi_whdentry);
14863 + hinode->hi_whdentry = h_wh;
14866 +void au_update_iigen(struct inode *inode)
14868 + atomic_set(&au_ii(inode)->ii_generation, au_sigen(inode->i_sb));
14869 + /* smp_mb(); */ /* atomic_set */
14872 +/* it may be called at remount time, too */
14873 +void au_update_brange(struct inode *inode, int do_put_zero)
14875 + struct au_iinfo *iinfo;
14877 + iinfo = au_ii(inode);
14878 + if (!iinfo || iinfo->ii_bstart < 0)
14881 + IiMustWriteLock(inode);
14883 + if (do_put_zero) {
14884 + aufs_bindex_t bindex;
14886 + for (bindex = iinfo->ii_bstart; bindex <= iinfo->ii_bend;
14888 + struct inode *h_i;
14890 + h_i = iinfo->ii_hinode[0 + bindex].hi_inode;
14891 + if (h_i && !h_i->i_nlink)
14892 + au_set_h_iptr(inode, bindex, NULL, 0);
14896 + iinfo->ii_bstart = -1;
14897 + while (++iinfo->ii_bstart <= iinfo->ii_bend)
14898 + if (iinfo->ii_hinode[0 + iinfo->ii_bstart].hi_inode)
14900 + if (iinfo->ii_bstart > iinfo->ii_bend) {
14901 + iinfo->ii_bstart = -1;
14902 + iinfo->ii_bend = -1;
14906 + iinfo->ii_bend++;
14907 + while (0 <= --iinfo->ii_bend)
14908 + if (iinfo->ii_hinode[0 + iinfo->ii_bend].hi_inode)
14910 + AuDebugOn(iinfo->ii_bstart > iinfo->ii_bend || iinfo->ii_bend < 0);
14913 +/* ---------------------------------------------------------------------- */
14915 +int au_iinfo_init(struct inode *inode)
14917 + struct au_iinfo *iinfo;
14918 + struct super_block *sb;
14921 + sb = inode->i_sb;
14922 + iinfo = &(container_of(inode, struct au_icntnr, vfs_inode)->iinfo);
14923 + nbr = au_sbend(sb) + 1;
14924 + if (unlikely(nbr <= 0))
14926 + iinfo->ii_hinode = kcalloc(nbr, sizeof(*iinfo->ii_hinode), GFP_NOFS);
14927 + if (iinfo->ii_hinode) {
14928 + for (i = 0; i < nbr; i++)
14929 + iinfo->ii_hinode[i].hi_id = -1;
14931 + atomic_set(&iinfo->ii_generation, au_sigen(sb));
14932 + /* smp_mb(); */ /* atomic_set */
14933 + au_rw_init(&iinfo->ii_rwsem);
14934 + iinfo->ii_bstart = -1;
14935 + iinfo->ii_bend = -1;
14936 + iinfo->ii_vdir = NULL;
14942 +int au_ii_realloc(struct au_iinfo *iinfo, int nbr)
14945 + struct au_hinode *hip;
14947 + AuRwMustWriteLock(&iinfo->ii_rwsem);
14950 + sz = sizeof(*hip) * (iinfo->ii_bend + 1);
14952 + sz = sizeof(*hip);
14953 + hip = au_kzrealloc(iinfo->ii_hinode, sz, sizeof(*hip) * nbr, GFP_NOFS);
14955 + iinfo->ii_hinode = hip;
14962 +static int au_iinfo_write0(struct super_block *sb, struct au_hinode *hinode,
14966 + aufs_bindex_t bindex;
14967 + unsigned char locked;
14970 + locked = !!si_noflush_read_trylock(sb);
14971 + bindex = au_br_index(sb, hinode->hi_id);
14973 + err = au_xino_write0(sb, bindex, hinode->hi_inode->i_ino, ino);
14974 + /* error action? */
14976 + si_read_unlock(sb);
14980 +void au_iinfo_fin(struct inode *inode)
14983 + aufs_bindex_t bend;
14984 + unsigned char unlinked = !inode->i_nlink;
14985 + struct au_iinfo *iinfo;
14986 + struct au_hinode *hi;
14987 + struct super_block *sb;
14990 + int err = au_xigen_inc(inode);
14991 + if (unlikely(err))
14992 + AuWarn1("failed resetting i_generation, %d\n", err);
14995 + iinfo = au_ii(inode);
14996 + /* bad_inode case */
15000 + if (iinfo->ii_vdir)
15001 + au_vdir_free(iinfo->ii_vdir);
15003 + if (iinfo->ii_bstart >= 0) {
15004 + sb = inode->i_sb;
15007 + ino = inode->i_ino;
15008 + hi = iinfo->ii_hinode + iinfo->ii_bstart;
15009 + bend = iinfo->ii_bend;
15010 + while (iinfo->ii_bstart++ <= bend) {
15011 + if (hi->hi_inode) {
15012 + if (unlinked || !hi->hi_inode->i_nlink) {
15013 + au_iinfo_write0(sb, hi, ino);
15014 + /* ignore this error */
15023 + kfree(iinfo->ii_hinode);
15024 + AuRwDestroy(&iinfo->ii_rwsem);
15026 diff --git a/fs/aufs/inode.c b/fs/aufs/inode.c
15027 new file mode 100644
15028 index 0000000..4273007
15030 +++ b/fs/aufs/inode.c
15033 + * Copyright (C) 2005-2009 Junjiro R. Okajima
15035 + * This program, aufs is free software; you can redistribute it and/or modify
15036 + * it under the terms of the GNU General Public License as published by
15037 + * the Free Software Foundation; either version 2 of the License, or
15038 + * (at your option) any later version.
15040 + * This program is distributed in the hope that it will be useful,
15041 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
15042 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15043 + * GNU General Public License for more details.
15045 + * You should have received a copy of the GNU General Public License
15046 + * along with this program; if not, write to the Free Software
15047 + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
15051 + * inode functions
15056 +struct inode *au_igrab(struct inode *inode)
15059 + AuDebugOn(!atomic_read(&inode->i_count));
15060 + atomic_inc_return(&inode->i_count);
15065 +static void au_refresh_hinode_attr(struct inode *inode, int do_version)
15067 + au_cpup_attr_all(inode, /*force*/0);
15068 + au_update_iigen(inode);
15070 + inode->i_version++;
15073 +int au_refresh_hinode_self(struct inode *inode, int do_attr)
15076 + aufs_bindex_t bindex, new_bindex;
15077 + unsigned char update;
15078 + struct inode *first;
15079 + struct au_hinode *p, *q, tmp;
15080 + struct super_block *sb;
15081 + struct au_iinfo *iinfo;
15083 + IiMustWriteLock(inode);
15086 + sb = inode->i_sb;
15087 + iinfo = au_ii(inode);
15088 + err = au_ii_realloc(iinfo, au_sbend(sb) + 1);
15089 + if (unlikely(err))
15092 + p = iinfo->ii_hinode + iinfo->ii_bstart;
15093 + first = p->hi_inode;
15095 + for (bindex = iinfo->ii_bstart; bindex <= iinfo->ii_bend;
15097 + if (!p->hi_inode)
15100 + new_bindex = au_br_index(sb, p->hi_id);
15101 + if (new_bindex == bindex)
15104 + if (new_bindex < 0) {
15107 + p->hi_inode = NULL;
15111 + if (new_bindex < iinfo->ii_bstart)
15112 + iinfo->ii_bstart = new_bindex;
15113 + if (iinfo->ii_bend < new_bindex)
15114 + iinfo->ii_bend = new_bindex;
15115 + /* swap two lower inode, and loop again */
15116 + q = iinfo->ii_hinode + new_bindex;
15120 + if (tmp.hi_inode) {
15125 + au_update_brange(inode, /*do_put_zero*/0);
15127 + au_refresh_hinode_attr(inode, update && S_ISDIR(inode->i_mode));
15133 +int au_refresh_hinode(struct inode *inode, struct dentry *dentry)
15136 + unsigned int flags;
15137 + aufs_bindex_t bindex, bend;
15138 + unsigned char isdir;
15139 + struct inode *first;
15140 + struct au_hinode *p;
15141 + struct au_iinfo *iinfo;
15143 + err = au_refresh_hinode_self(inode, /*do_attr*/0);
15144 + if (unlikely(err))
15148 + iinfo = au_ii(inode);
15149 + p = iinfo->ii_hinode + iinfo->ii_bstart;
15150 + first = p->hi_inode;
15151 + isdir = S_ISDIR(inode->i_mode);
15152 + flags = au_hi_flags(inode, isdir);
15153 + bend = au_dbend(dentry);
15154 + for (bindex = au_dbstart(dentry); bindex <= bend; bindex++) {
15155 + struct inode *h_i;
15156 + struct dentry *h_d;
15158 + h_d = au_h_dptr(dentry, bindex);
15159 + if (!h_d || !h_d->d_inode)
15162 + if (iinfo->ii_bstart <= bindex && bindex <= iinfo->ii_bend) {
15163 + h_i = au_h_iptr(inode, bindex);
15165 + if (h_i == h_d->d_inode)
15171 + if (bindex < iinfo->ii_bstart)
15172 + iinfo->ii_bstart = bindex;
15173 + if (iinfo->ii_bend < bindex)
15174 + iinfo->ii_bend = bindex;
15175 + au_set_h_iptr(inode, bindex, au_igrab(h_d->d_inode), flags);
15178 + au_update_brange(inode, /*do_put_zero*/0);
15180 + if (unlikely(err))
15183 + au_refresh_hinode_attr(inode, update && isdir);
15190 +static int set_inode(struct inode *inode, struct dentry *dentry)
15193 + unsigned int flags;
15195 + aufs_bindex_t bindex, bstart, btail;
15196 + unsigned char isdir;
15197 + struct dentry *h_dentry;
15198 + struct inode *h_inode;
15199 + struct au_iinfo *iinfo;
15201 + IiMustWriteLock(inode);
15205 + bstart = au_dbstart(dentry);
15206 + h_inode = au_h_dptr(dentry, bstart)->d_inode;
15207 + mode = h_inode->i_mode;
15208 + switch (mode & S_IFMT) {
15210 + btail = au_dbtail(dentry);
15211 + inode->i_op = &aufs_iop;
15212 + inode->i_fop = &aufs_file_fop;
15213 + inode->i_mapping->a_ops = &aufs_aop;
15217 + btail = au_dbtaildir(dentry);
15218 + inode->i_op = &aufs_dir_iop;
15219 + inode->i_fop = &aufs_dir_fop;
15222 + btail = au_dbtail(dentry);
15223 + inode->i_op = &aufs_symlink_iop;
15229 + btail = au_dbtail(dentry);
15230 + inode->i_op = &aufs_iop;
15231 + au_init_special_fop(inode, mode, h_inode->i_rdev);
15234 + AuIOErr("Unknown file type 0%o\n", mode);
15239 + /* do not set inotify for whiteouted dirs (SHWH mode) */
15240 + flags = au_hi_flags(inode, isdir);
15241 + if (au_opt_test(au_mntflags(dentry->d_sb), SHWH)
15242 + && au_ftest_hi(flags, HINOTIFY)
15243 + && dentry->d_name.len > AUFS_WH_PFX_LEN
15244 + && !memcmp(dentry->d_name.name, AUFS_WH_PFX, AUFS_WH_PFX_LEN))
15245 + au_fclr_hi(flags, HINOTIFY);
15246 + iinfo = au_ii(inode);
15247 + iinfo->ii_bstart = bstart;
15248 + iinfo->ii_bend = btail;
15249 + for (bindex = bstart; bindex <= btail; bindex++) {
15250 + h_dentry = au_h_dptr(dentry, bindex);
15252 + au_set_h_iptr(inode, bindex,
15253 + au_igrab(h_dentry->d_inode), flags);
15255 + au_cpup_attr_all(inode, /*force*/1);
15261 +/* successful returns with iinfo write_locked */
15262 +static int reval_inode(struct inode *inode, struct dentry *dentry, int *matched)
15265 + aufs_bindex_t bindex, bend;
15266 + struct inode *h_inode, *h_dinode;
15271 + * before this function, if aufs got any iinfo lock, it must be only
15272 + * one, the parent dir.
15273 + * it can happen by UDBA and the obsoleted inode number.
15276 + if (unlikely(inode->i_ino == parent_ino(dentry)))
15280 + ii_write_lock_new_child(inode);
15281 + h_dinode = au_h_dptr(dentry, au_dbstart(dentry))->d_inode;
15282 + bend = au_ibend(inode);
15283 + for (bindex = au_ibstart(inode); bindex <= bend; bindex++) {
15284 + h_inode = au_h_iptr(inode, bindex);
15285 + if (h_inode && h_inode == h_dinode) {
15288 + if (au_iigen(inode) != au_digen(dentry))
15289 + err = au_refresh_hinode(inode, dentry);
15294 + if (unlikely(err))
15295 + ii_write_unlock(inode);
15300 +int au_ino(struct super_block *sb, aufs_bindex_t bindex, ino_t h_ino,
15301 + unsigned int d_type, ino_t *ino)
15304 + struct mutex *mtx;
15305 + const int isdir = (d_type == DT_DIR);
15307 + /* prevent hardlinks from race condition */
15310 + mtx = &au_sbr(sb, bindex)->br_xino.xi_nondir_mtx;
15313 + err = au_xino_read(sb, bindex, h_ino, ino);
15314 + if (unlikely(err))
15319 + *ino = au_xino_new_ino(sb);
15320 + if (unlikely(!*ino))
15322 + err = au_xino_write(sb, bindex, h_ino, *ino);
15323 + if (unlikely(err))
15329 + mutex_unlock(mtx);
15333 +/* successful returns with iinfo write_locked */
15334 +/* todo: return with unlocked? */
15335 +struct inode *au_new_inode(struct dentry *dentry, int must_new)
15337 + struct inode *inode;
15338 + struct dentry *h_dentry;
15339 + struct super_block *sb;
15340 + ino_t h_ino, ino;
15342 + aufs_bindex_t bstart;
15344 + sb = dentry->d_sb;
15345 + bstart = au_dbstart(dentry);
15346 + h_dentry = au_h_dptr(dentry, bstart);
15347 + h_ino = h_dentry->d_inode->i_ino;
15348 + err = au_xino_read(sb, bstart, h_ino, &ino);
15349 + inode = ERR_PTR(err);
15350 + if (unlikely(err))
15354 + ino = au_xino_new_ino(sb);
15355 + if (unlikely(!ino)) {
15356 + inode = ERR_PTR(-EIO);
15361 + AuDbg("i%lu\n", (unsigned long)ino);
15362 + inode = au_iget_locked(sb, ino);
15363 + err = PTR_ERR(inode);
15364 + if (IS_ERR(inode))
15367 + AuDbg("%lx, new %d\n", inode->i_state, !!(inode->i_state & I_NEW));
15368 + if (inode->i_state & I_NEW) {
15369 + ii_write_lock_new_child(inode);
15370 + err = set_inode(inode, dentry);
15371 + unlock_new_inode(inode);
15373 + goto out; /* success */
15375 + iget_failed(inode);
15376 + ii_write_unlock(inode);
15378 + } else if (!must_new) {
15379 + err = reval_inode(inode, dentry, &match);
15381 + goto out; /* success */
15386 + if (unlikely(au_test_fs_unique_ino(h_dentry->d_inode)))
15387 + AuWarn1("Warning: Un-notified UDBA or repeatedly renamed dir,"
15388 + " b%d, %s, %.*s, hi%lu, i%lu.\n",
15389 + bstart, au_sbtype(h_dentry->d_sb), AuDLNPair(dentry),
15390 + (unsigned long)h_ino, (unsigned long)ino);
15392 + err = au_xino_write(sb, bstart, h_ino, /*ino*/0);
15400 + inode = ERR_PTR(err);
15405 +/* ---------------------------------------------------------------------- */
15407 +int au_test_ro(struct super_block *sb, aufs_bindex_t bindex,
15408 + struct inode *inode)
15412 + err = au_br_rdonly(au_sbr(sb, bindex));
15414 + /* pseudo-link after flushed may happen out of bounds */
15417 + && au_ibstart(inode) <= bindex
15418 + && bindex <= au_ibend(inode)) {
15420 + * permission check is unnecessary since vfsub routine
15421 + * will be called later
15423 + struct inode *hi = au_h_iptr(inode, bindex);
15425 + err = IS_IMMUTABLE(hi) ? -EROFS : 0;
15431 +int au_test_h_perm(struct inode *h_inode, int mask)
15433 + if (!current->fsuid)
15435 + return inode_permission(h_inode, mask);
15438 +int au_test_h_perm_sio(struct inode *h_inode, int mask)
15440 + if (au_test_nfs(h_inode->i_sb)
15441 + && (mask & MAY_WRITE)
15442 + && S_ISDIR(h_inode->i_mode))
15443 + mask |= MAY_READ; /* force permission check */
15444 + return au_test_h_perm(h_inode, mask);
15446 diff --git a/fs/aufs/inode.h b/fs/aufs/inode.h
15447 new file mode 100644
15448 index 0000000..39a8ae5
15450 +++ b/fs/aufs/inode.h
15453 + * Copyright (C) 2005-2009 Junjiro R. Okajima
15455 + * This program, aufs is free software; you can redistribute it and/or modify
15456 + * it under the terms of the GNU General Public License as published by
15457 + * the Free Software Foundation; either version 2 of the License, or
15458 + * (at your option) any later version.
15460 + * This program is distributed in the hope that it will be useful,
15461 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
15462 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15463 + * GNU General Public License for more details.
15465 + * You should have received a copy of the GNU General Public License
15466 + * along with this program; if not, write to the Free Software
15467 + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
15471 + * inode operations
15474 +#ifndef __AUFS_INODE_H__
15475 +#define __AUFS_INODE_H__
15479 +#include <linux/fs.h>
15480 +#include <linux/inotify.h>
15481 +#include <linux/aufs_type.h>
15482 +#include "rwsem.h"
15486 +struct au_hinotify {
15487 +#ifdef CONFIG_AUFS_HINOTIFY
15488 + struct inotify_watch hin_watch;
15489 + struct inode *hin_aufs_inode; /* no get/put */
15493 +struct au_hinode {
15494 + struct inode *hi_inode;
15495 + aufs_bindex_t hi_id;
15496 +#ifdef CONFIG_AUFS_HINOTIFY
15497 + struct au_hinotify *hi_notify;
15500 + /* reference to the copied-up whiteout with get/put */
15501 + struct dentry *hi_whdentry;
15506 + atomic_t ii_generation;
15507 + struct super_block *ii_hsb1; /* no get/put */
15509 + struct au_rwsem ii_rwsem;
15510 + aufs_bindex_t ii_bstart, ii_bend;
15512 + struct au_hinode *ii_hinode;
15513 + struct au_vdir *ii_vdir;
15516 +struct au_icntnr {
15517 + struct au_iinfo iinfo;
15518 + struct inode vfs_inode;
15521 +/* au_pin flags */
15522 +#define AuPin_DI_LOCKED 1
15523 +#define AuPin_MNT_WRITE (1 << 1)
15524 +#define au_ftest_pin(flags, name) ((flags) & AuPin_##name)
15525 +#define au_fset_pin(flags, name) { (flags) |= AuPin_##name; }
15526 +#define au_fclr_pin(flags, name) { (flags) &= ~AuPin_##name; }
15530 + struct dentry *dentry;
15531 + unsigned int udba;
15532 + unsigned char lsc_di, lsc_hi, flags;
15533 + aufs_bindex_t bindex;
15536 + struct dentry *parent;
15537 + struct au_hinode *hdir;
15538 + struct vfsmount *h_mnt;
15541 +/* ---------------------------------------------------------------------- */
15543 +static inline struct au_iinfo *au_ii(struct inode *inode)
15545 + struct au_iinfo *iinfo;
15547 + iinfo = &(container_of(inode, struct au_icntnr, vfs_inode)->iinfo);
15548 + if (iinfo->ii_hinode)
15550 + return NULL; /* debugging bad_inode case */
15553 +/* ---------------------------------------------------------------------- */
15556 +struct inode *au_igrab(struct inode *inode);
15557 +int au_refresh_hinode_self(struct inode *inode, int do_attr);
15558 +int au_refresh_hinode(struct inode *inode, struct dentry *dentry);
15559 +int au_ino(struct super_block *sb, aufs_bindex_t bindex, ino_t h_ino,
15560 + unsigned int d_type, ino_t *ino);
15561 +struct inode *au_new_inode(struct dentry *dentry, int must_new);
15562 +int au_test_ro(struct super_block *sb, aufs_bindex_t bindex,
15563 + struct inode *inode);
15564 +int au_test_h_perm(struct inode *h_inode, int mask);
15565 +int au_test_h_perm_sio(struct inode *h_inode, int mask);
15567 +static inline int au_wh_ino(struct super_block *sb, aufs_bindex_t bindex,
15568 + ino_t h_ino, unsigned int d_type, ino_t *ino)
15570 +#ifdef CONFIG_AUFS_SHWH
15571 + return au_ino(sb, bindex, h_ino, d_type, ino);
15578 +extern struct inode_operations aufs_iop, aufs_symlink_iop, aufs_dir_iop;
15580 +/* au_wr_dir flags */
15581 +#define AuWrDir_ADD_ENTRY 1
15582 +#define AuWrDir_ISDIR (1 << 1)
15583 +#define au_ftest_wrdir(flags, name) ((flags) & AuWrDir_##name)
15584 +#define au_fset_wrdir(flags, name) { (flags) |= AuWrDir_##name; }
15585 +#define au_fclr_wrdir(flags, name) { (flags) &= ~AuWrDir_##name; }
15587 +struct au_wr_dir_args {
15588 + aufs_bindex_t force_btgt;
15589 + unsigned char flags;
15591 +int au_wr_dir(struct dentry *dentry, struct dentry *src_dentry,
15592 + struct au_wr_dir_args *args);
15594 +struct dentry *au_pinned_h_parent(struct au_pin *pin);
15595 +void au_pin_init(struct au_pin *pin, struct dentry *dentry,
15596 + aufs_bindex_t bindex, int lsc_di, int lsc_hi,
15597 + unsigned int udba, unsigned char flags);
15598 +int au_pin(struct au_pin *pin, struct dentry *dentry, aufs_bindex_t bindex,
15599 + unsigned int udba, unsigned char flags) __must_check;
15600 +int au_do_pin(struct au_pin *pin) __must_check;
15601 +void au_unpin(struct au_pin *pin);
15604 +int au_may_add(struct dentry *dentry, aufs_bindex_t bindex,
15605 + struct dentry *h_parent, int isdir);
15606 +int aufs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev);
15607 +int aufs_symlink(struct inode *dir, struct dentry *dentry, const char *symname);
15608 +int aufs_create(struct inode *dir, struct dentry *dentry, int mode,
15609 + struct nameidata *nd);
15610 +int aufs_link(struct dentry *src_dentry, struct inode *dir,
15611 + struct dentry *dentry);
15612 +int aufs_mkdir(struct inode *dir, struct dentry *dentry, int mode);
15615 +int au_wr_dir_need_wh(struct dentry *dentry, int isdir, aufs_bindex_t *bcpup);
15616 +int au_may_del(struct dentry *dentry, aufs_bindex_t bindex,
15617 + struct dentry *h_parent, int isdir);
15618 +int aufs_unlink(struct inode *dir, struct dentry *dentry);
15619 +int aufs_rmdir(struct inode *dir, struct dentry *dentry);
15622 +int au_wbr(struct dentry *dentry, aufs_bindex_t btgt);
15623 +int aufs_rename(struct inode *src_dir, struct dentry *src_dentry,
15624 + struct inode *dir, struct dentry *dentry);
15627 +struct inode *au_h_iptr(struct inode *inode, aufs_bindex_t bindex);
15628 +void au_hiput(struct au_hinode *hinode);
15629 +void au_set_ibstart(struct inode *inode, aufs_bindex_t bindex);
15630 +void au_set_hi_wh(struct inode *inode, aufs_bindex_t bindex,
15631 + struct dentry *h_wh);
15632 +unsigned int au_hi_flags(struct inode *inode, int isdir);
15634 +/* hinode flags */
15635 +#define AuHi_XINO 1
15636 +#define AuHi_HINOTIFY (1 << 1)
15637 +#define au_ftest_hi(flags, name) ((flags) & AuHi_##name)
15638 +#define au_fset_hi(flags, name) { (flags) |= AuHi_##name; }
15639 +#define au_fclr_hi(flags, name) { (flags) &= ~AuHi_##name; }
15641 +#ifndef CONFIG_AUFS_HINOTIFY
15642 +#undef AuHi_HINOTIFY
15643 +#define AuHi_HINOTIFY 0
15646 +void au_set_h_iptr(struct inode *inode, aufs_bindex_t bindex,
15647 + struct inode *h_inode, unsigned int flags);
15649 +void au_update_iigen(struct inode *inode);
15650 +void au_update_brange(struct inode *inode, int do_put_zero);
15652 +int au_iinfo_init(struct inode *inode);
15653 +void au_iinfo_fin(struct inode *inode);
15654 +int au_ii_realloc(struct au_iinfo *iinfo, int nbr);
15657 +void au_plink_maint_block(struct super_block *sb);
15658 +void au_plink_maint_leave(struct file *file);
15659 +#ifdef CONFIG_AUFS_DEBUG
15660 +void au_plink_list(struct super_block *sb);
15662 +AuStubVoid(au_plink_list, struct super_block *sb)
15664 +int au_plink_test(struct inode *inode);
15665 +struct dentry *au_plink_lkup(struct inode *inode, aufs_bindex_t bindex);
15666 +void au_plink_append(struct inode *inode, aufs_bindex_t bindex,
15667 + struct dentry *h_dentry);
15668 +void au_plink_put(struct super_block *sb);
15669 +void au_plink_half_refresh(struct super_block *sb, aufs_bindex_t br_id);
15670 +long au_plink_ioctl(struct file *file, unsigned int cmd);
15672 +/* ---------------------------------------------------------------------- */
15674 +/* lock subclass for iinfo */
15676 + AuLsc_II_CHILD, /* child first */
15677 + AuLsc_II_CHILD2, /* rename(2), link(2), and cpup at hinotify */
15678 + AuLsc_II_CHILD3, /* copyup dirs */
15679 + AuLsc_II_PARENT, /* see AuLsc_I_PARENT in vfsub.h */
15680 + AuLsc_II_PARENT2,
15681 + AuLsc_II_PARENT3, /* copyup dirs */
15682 + AuLsc_II_NEW_CHILD
15686 + * ii_read_lock_child, ii_write_lock_child,
15687 + * ii_read_lock_child2, ii_write_lock_child2,
15688 + * ii_read_lock_child3, ii_write_lock_child3,
15689 + * ii_read_lock_parent, ii_write_lock_parent,
15690 + * ii_read_lock_parent2, ii_write_lock_parent2,
15691 + * ii_read_lock_parent3, ii_write_lock_parent3,
15692 + * ii_read_lock_new_child, ii_write_lock_new_child,
15694 +#define AuReadLockFunc(name, lsc) \
15695 +static inline void ii_read_lock_##name(struct inode *i) \
15697 + au_rw_read_lock_nested(&au_ii(i)->ii_rwsem, AuLsc_II_##lsc); \
15700 +#define AuWriteLockFunc(name, lsc) \
15701 +static inline void ii_write_lock_##name(struct inode *i) \
15703 + au_rw_write_lock_nested(&au_ii(i)->ii_rwsem, AuLsc_II_##lsc); \
15706 +#define AuRWLockFuncs(name, lsc) \
15707 + AuReadLockFunc(name, lsc) \
15708 + AuWriteLockFunc(name, lsc)
15710 +AuRWLockFuncs(child, CHILD);
15711 +AuRWLockFuncs(child2, CHILD2);
15712 +AuRWLockFuncs(child3, CHILD3);
15713 +AuRWLockFuncs(parent, PARENT);
15714 +AuRWLockFuncs(parent2, PARENT2);
15715 +AuRWLockFuncs(parent3, PARENT3);
15716 +AuRWLockFuncs(new_child, NEW_CHILD);
15718 +#undef AuReadLockFunc
15719 +#undef AuWriteLockFunc
15720 +#undef AuRWLockFuncs
15723 + * ii_read_unlock, ii_write_unlock, ii_downgrade_lock
15725 +AuSimpleUnlockRwsemFuncs(ii, struct inode *i, &au_ii(i)->ii_rwsem);
15727 +#define IiMustNoWaiters(i) AuRwMustNoWaiters(&au_ii(i)->ii_rwsem)
15728 +#define IiMustAnyLock(i) AuRwMustAnyLock(&au_ii(i)->ii_rwsem)
15729 +#define IiMustWriteLock(i) AuRwMustWriteLock(&au_ii(i)->ii_rwsem)
15731 +/* ---------------------------------------------------------------------- */
15733 +static inline unsigned int au_iigen(struct inode *inode)
15735 + return atomic_read(&au_ii(inode)->ii_generation);
15738 +/* tiny test for inode number */
15739 +/* tmpfs generation is too rough */
15740 +static inline int au_test_higen(struct inode *inode, struct inode *h_inode)
15742 + struct au_iinfo *iinfo;
15744 + iinfo = au_ii(inode);
15745 + AuRwMustAnyLock(&iinfo->ii_rwsem);
15746 + return !(iinfo->ii_hsb1 == h_inode->i_sb
15747 + && iinfo->ii_higen == h_inode->i_generation);
15750 +/* ---------------------------------------------------------------------- */
15752 +static inline aufs_bindex_t au_ii_br_id(struct inode *inode,
15753 + aufs_bindex_t bindex)
15755 + IiMustAnyLock(inode);
15756 + return au_ii(inode)->ii_hinode[0 + bindex].hi_id;
15759 +static inline aufs_bindex_t au_ibstart(struct inode *inode)
15761 + IiMustAnyLock(inode);
15762 + return au_ii(inode)->ii_bstart;
15765 +static inline aufs_bindex_t au_ibend(struct inode *inode)
15767 + IiMustAnyLock(inode);
15768 + return au_ii(inode)->ii_bend;
15771 +static inline struct au_vdir *au_ivdir(struct inode *inode)
15773 + IiMustAnyLock(inode);
15774 + return au_ii(inode)->ii_vdir;
15777 +static inline struct dentry *au_hi_wh(struct inode *inode, aufs_bindex_t bindex)
15779 + IiMustAnyLock(inode);
15780 + return au_ii(inode)->ii_hinode[0 + bindex].hi_whdentry;
15783 +static inline void au_set_ibend(struct inode *inode, aufs_bindex_t bindex)
15785 + IiMustWriteLock(inode);
15786 + au_ii(inode)->ii_bend = bindex;
15789 +static inline void au_set_ivdir(struct inode *inode, struct au_vdir *vdir)
15791 + IiMustWriteLock(inode);
15792 + au_ii(inode)->ii_vdir = vdir;
15795 +static inline struct au_hinode *au_hi(struct inode *inode, aufs_bindex_t bindex)
15797 + IiMustAnyLock(inode);
15798 + return au_ii(inode)->ii_hinode + bindex;
15801 +/* ---------------------------------------------------------------------- */
15803 +static inline struct dentry *au_pinned_parent(struct au_pin *pin)
15806 + return pin->parent;
15810 +static inline struct inode *au_pinned_h_dir(struct au_pin *pin)
15812 + if (pin && pin->hdir)
15813 + return pin->hdir->hi_inode;
15817 +static inline struct au_hinode *au_pinned_hdir(struct au_pin *pin)
15820 + return pin->hdir;
15824 +static inline void au_pin_set_dentry(struct au_pin *pin, struct dentry *dentry)
15827 + pin->dentry = dentry;
15830 +static inline void au_pin_set_parent_lflag(struct au_pin *pin,
15831 + unsigned char lflag)
15834 + /* dirty macros require brackets */
15836 + au_fset_pin(pin->flags, DI_LOCKED);
15838 + au_fclr_pin(pin->flags, DI_LOCKED);
15843 +static inline void au_pin_set_parent(struct au_pin *pin, struct dentry *parent)
15846 + dput(pin->parent);
15847 + pin->parent = dget(parent);
15851 +/* ---------------------------------------------------------------------- */
15853 +#ifdef CONFIG_AUFS_HINOTIFY
15855 +int au_hin_alloc(struct au_hinode *hinode, struct inode *inode,
15856 + struct inode *h_inode);
15857 +void au_hin_free(struct au_hinode *hinode);
15858 +void au_hin_ctl(struct au_hinode *hinode, int do_set);
15859 +void au_reset_hinotify(struct inode *inode, unsigned int flags);
15861 +int __init au_hinotify_init(void);
15862 +void au_hinotify_fin(void);
15865 +void au_hin_init(struct au_hinode *hinode, struct au_hinotify *val)
15867 + hinode->hi_notify = val;
15870 +static inline void au_iigen_dec(struct inode *inode)
15872 + atomic_dec_return(&au_ii(inode)->ii_generation);
15877 +int au_hin_alloc(struct au_hinode *hinode __maybe_unused,
15878 + struct inode *inode __maybe_unused,
15879 + struct inode *h_inode __maybe_unused)
15881 + return -EOPNOTSUPP;
15884 +AuStubVoid(au_hin_free, struct au_hinode *hinode __maybe_unused)
15885 +AuStubVoid(au_hin_ctl, struct au_hinode *hinode __maybe_unused,
15886 + int do_set __maybe_unused)
15887 +AuStubVoid(au_reset_hinotify, struct inode *inode __maybe_unused,
15888 + unsigned int flags __maybe_unused)
15889 +AuStubInt0(__init au_hinotify_init, void)
15890 +AuStubVoid(au_hinotify_fin, void)
15891 +AuStubVoid(au_hin_init, struct au_hinode *hinode __maybe_unused,
15892 + struct au_hinotify *val __maybe_unused)
15893 +#endif /* CONFIG_AUFS_HINOTIFY */
15895 +static inline void au_hin_suspend(struct au_hinode *hdir)
15897 + au_hin_ctl(hdir, /*do_set*/0);
15900 +static inline void au_hin_resume(struct au_hinode *hdir)
15902 + au_hin_ctl(hdir, /*do_set*/1);
15905 +static inline void au_hin_imtx_lock(struct au_hinode *hdir)
15907 + mutex_lock(&hdir->hi_inode->i_mutex);
15908 + au_hin_suspend(hdir);
15911 +static inline void au_hin_imtx_lock_nested(struct au_hinode *hdir,
15912 + unsigned int sc __maybe_unused)
15914 + mutex_lock_nested(&hdir->hi_inode->i_mutex, sc);
15915 + au_hin_suspend(hdir);
15918 +static inline void au_hin_imtx_unlock(struct au_hinode *hdir)
15920 + au_hin_resume(hdir);
15921 + mutex_unlock(&hdir->hi_inode->i_mutex);
15924 +#endif /* __KERNEL__ */
15925 +#endif /* __AUFS_INODE_H__ */
15926 diff --git a/fs/aufs/ioctl.c b/fs/aufs/ioctl.c
15927 new file mode 100644
15928 index 0000000..e4aba32
15930 +++ b/fs/aufs/ioctl.c
15933 + * Copyright (C) 2005-2009 Junjiro R. Okajima
15935 + * This program, aufs is free software; you can redistribute it and/or modify
15936 + * it under the terms of the GNU General Public License as published by
15937 + * the Free Software Foundation; either version 2 of the License, or
15938 + * (at your option) any later version.
15940 + * This program is distributed in the hope that it will be useful,
15941 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
15942 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15943 + * GNU General Public License for more details.
15945 + * You should have received a copy of the GNU General Public License
15946 + * along with this program; if not, write to the Free Software
15947 + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
15952 + * plink-management and readdir in userspace.
15953 + * assist the pathconf(3) wrapper library.
15956 +#include <linux/file.h>
15959 +static int au_wbr_fd(struct path *path)
15961 + int err, fd, flags;
15962 + aufs_bindex_t wbi, bindex, bend;
15963 + struct file *h_file;
15964 + struct super_block *sb;
15965 + struct dentry *root;
15966 + struct au_branch *wbr;
15968 + err = get_unused_fd();
15969 + if (unlikely(err < 0))
15973 + flags = O_RDONLY | O_DIRECTORY;
15974 + if (force_o_largefile())
15975 + flags |= O_LARGEFILE;
15978 + sb = path->dentry->d_sb;
15979 + root = sb->s_root;
15980 + aufs_read_lock(root, AuLock_IR);
15981 + wbr = au_sbr(sb, wbi);
15982 + if (!(path->mnt->mnt_flags & MNT_READONLY)
15983 + && !au_br_writable(wbr->br_perm)) {
15984 + bend = au_sbend(sb);
15985 + for (bindex = 1; bindex <= bend; bindex++) {
15986 + wbr = au_sbr(sb, bindex);
15987 + if (au_br_writable(wbr->br_perm)) {
15992 + wbr = au_sbr(sb, wbi);
15994 + AuDbg("wbi %d\n", wbi);
15995 + h_file = au_h_open(root, wbi, flags, NULL);
15996 + aufs_read_unlock(root, AuLock_IR);
15997 + err = PTR_ERR(h_file);
15998 + if (IS_ERR(h_file))
16001 + atomic_dec(&wbr->br_count); /* cf. au_h_open() */
16002 + fd_install(fd, h_file);
16004 + goto out; /* success */
16007 + put_unused_fd(fd);
16012 +/* ---------------------------------------------------------------------- */
16014 +long aufs_ioctl_dir(struct file *file, unsigned int cmd, unsigned long arg)
16019 + case AUFS_CTL_PLINK_MAINT:
16020 + case AUFS_CTL_PLINK_CLEAN:
16021 + err = au_plink_ioctl(file, cmd);
16024 + case AUFS_CTL_RDU:
16025 + case AUFS_CTL_RDU_INO:
16026 + err = au_rdu_ioctl(file, cmd, arg);
16029 + case AUFS_CTL_WBR_FD:
16030 + err = au_wbr_fd(&file->f_path);
16034 + AuDbg("0x%x\n", cmd);
16042 +long aufs_ioctl_nondir(struct file *file, unsigned int cmd, unsigned long arg)
16047 + case AUFS_CTL_WBR_FD:
16048 + err = au_wbr_fd(&file->f_path);
16052 + AuDbg("0x%x\n", cmd);
16059 diff --git a/fs/aufs/loop.c b/fs/aufs/loop.c
16060 new file mode 100644
16061 index 0000000..277011f
16063 +++ b/fs/aufs/loop.c
16066 + * Copyright (C) 2005-2009 Junjiro R. Okajima
16068 + * This program, aufs is free software; you can redistribute it and/or modify
16069 + * it under the terms of the GNU General Public License as published by
16070 + * the Free Software Foundation; either version 2 of the License, or
16071 + * (at your option) any later version.
16073 + * This program is distributed in the hope that it will be useful,
16074 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
16075 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16076 + * GNU General Public License for more details.
16078 + * You should have received a copy of the GNU General Public License
16079 + * along with this program; if not, write to the Free Software
16080 + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
16084 + * support for loopback block device as a branch
16087 +#include <linux/loop.h>
16091 + * test if two lower dentries have overlapping branches.
16093 +int au_test_loopback_overlap(struct super_block *sb, struct dentry *h_d1,
16094 + struct dentry *h_d2)
16096 + struct inode *h_inode;
16097 + struct loop_device *l;
16099 + h_inode = h_d1->d_inode;
16100 + if (MAJOR(h_inode->i_sb->s_dev) != LOOP_MAJOR)
16103 + l = h_inode->i_sb->s_bdev->bd_disk->private_data;
16104 + h_d1 = l->lo_backing_file->f_dentry;
16105 + /* h_d1 can be local NFS. in this case aufs cannot detect the loop */
16106 + if (unlikely(h_d1->d_sb == sb))
16108 + return !!au_test_subdir(h_d1, h_d2);
16111 +/* true if a kernel thread named 'loop[0-9].*' accesses a file */
16112 +int au_test_loopback_kthread(void)
16114 + const char c = current->comm[4];
16116 + return current->mm == NULL
16117 + && '0' <= c && c <= '9'
16118 + && strncmp(current->comm, "loop", 4) == 0;
16120 diff --git a/fs/aufs/loop.h b/fs/aufs/loop.h
16121 new file mode 100644
16122 index 0000000..fe88093
16124 +++ b/fs/aufs/loop.h
16127 + * Copyright (C) 2005-2009 Junjiro R. Okajima
16129 + * This program, aufs is free software; you can redistribute it and/or modify
16130 + * it under the terms of the GNU General Public License as published by
16131 + * the Free Software Foundation; either version 2 of the License, or
16132 + * (at your option) any later version.
16134 + * This program is distributed in the hope that it will be useful,
16135 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
16136 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16137 + * GNU General Public License for more details.
16139 + * You should have received a copy of the GNU General Public License
16140 + * along with this program; if not, write to the Free Software
16141 + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
16145 + * support for loopback mount as a branch
16148 +#ifndef __AUFS_LOOP_H__
16149 +#define __AUFS_LOOP_H__
16154 +struct super_block;
16156 +#ifdef CONFIG_AUFS_BDEV_LOOP
16158 +int au_test_loopback_overlap(struct super_block *sb, struct dentry *h_d1,
16159 + struct dentry *h_d2);
16160 +int au_test_loopback_kthread(void);
16162 +AuStubInt0(au_test_loopback_overlap, struct super_block *sb,
16163 + struct dentry *h_d1, struct dentry *h_d2)
16164 +AuStubInt0(au_test_loopback_kthread, void)
16165 +#endif /* BLK_DEV_LOOP */
16167 +#endif /* __KERNEL__ */
16168 +#endif /* __AUFS_LOOP_H__ */
16169 diff --git a/fs/aufs/magic.mk b/fs/aufs/magic.mk
16170 new file mode 100644
16171 index 0000000..47c5af7
16173 +++ b/fs/aufs/magic.mk
16176 +# defined in ${srctree}/fs/fuse/inode.c
16178 +ifdef CONFIG_FUSE_FS
16179 +ccflags-y += -DFUSE_SUPER_MAGIC=0x65735546
16182 +# defined in ${srctree}/fs/ocfs2/ocfs2_fs.h
16184 +ifdef CONFIG_OCFS2_FS
16185 +ccflags-y += -DOCFS2_SUPER_MAGIC=0x7461636f
16188 +# defined in ${srctree}/fs/ocfs2/dlm/userdlm.h
16190 +ifdef CONFIG_OCFS2_FS_O2CB
16191 +ccflags-y += -DDLMFS_MAGIC=0x76a9f425
16194 +# defined in ${srctree}/fs/ramfs/inode.c
16196 +ccflags-y += -DRAMFS_MAGIC=0x858458f6
16198 +# defined in ${srctree}/fs/cifs/cifsfs.c
16200 +ifdef CONFIG_CIFS_FS
16201 +ccflags-y += -DCIFS_MAGIC_NUMBER=0xFF534D42
16204 +# defined in ${srctree}/fs/xfs/xfs_sb.h
16206 +ifdef CONFIG_XFS_FS
16207 +ccflags-y += -DXFS_SB_MAGIC=0x58465342
16210 +# defined in ${srctree}/mm/shmem.c
16212 +ccflags-$(CONFIG_TMPFS) += -DTMPFS_MAGIC=0x01021994
16214 +# defined in ${srctree}/fs/sysfs/mount.c
16216 +ccflags-$(CONFIG_SYSFS) += -DSYSFS_MAGIC=0x62656572
16218 +# defined in ${srctree}/fs/configfs/mount.c
16220 +ifdef CONFIG_CONFIGFS_FS
16221 +ccflags-y += -DCONFIGFS_MAGIC=0x62656570
16224 +# defined in ${srctree}/fs/9p/v9fs.h
16226 +ifdef CONFIG_9P_FS
16227 +ccflags-y += -DV9FS_MAGIC=0x01021997
16230 +# defined in ${srctree}/fs/ubifs/ubifs.h
16232 +ifdef CONFIG_UBIFS_FS
16233 +ccflags-y += -DUBIFS_SUPER_MAGIC=0x24051905
16236 +# defined in ${srctree}/fs/debugfs/inode.c
16238 +ifdef CONFIG_DEBUG_FS
16239 +ccflags-y += -DDEBUGFS_MAGIC=0x64626720
16241 diff --git a/fs/aufs/module.c b/fs/aufs/module.c
16242 new file mode 100644
16243 index 0000000..dbfb2c4
16245 +++ b/fs/aufs/module.c
16248 + * Copyright (C) 2005-2009 Junjiro R. Okajima
16250 + * This program, aufs is free software; you can redistribute it and/or modify
16251 + * it under the terms of the GNU General Public License as published by
16252 + * the Free Software Foundation; either version 2 of the License, or
16253 + * (at your option) any later version.
16255 + * This program is distributed in the hope that it will be useful,
16256 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
16257 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16258 + * GNU General Public License for more details.
16260 + * You should have received a copy of the GNU General Public License
16261 + * along with this program; if not, write to the Free Software
16262 + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
16266 + * module global variables and operations
16269 +#include <linux/module.h>
16270 +#include <linux/seq_file.h>
16273 +void *au_kzrealloc(void *p, unsigned int nused, unsigned int new_sz, gfp_t gfp)
16275 + if (new_sz <= nused)
16278 + p = krealloc(p, new_sz, gfp);
16280 + memset(p + nused, 0, new_sz - nused);
16284 +/* ---------------------------------------------------------------------- */
16289 +struct kmem_cache *au_cachep[AuCache_Last];
16290 +static int __init au_cache_init(void)
16292 + au_cachep[AuCache_DINFO] = AuCache(au_dinfo);
16293 + if (au_cachep[AuCache_DINFO])
16294 + au_cachep[AuCache_ICNTNR] = AuCache(au_icntnr);
16295 + if (au_cachep[AuCache_ICNTNR])
16296 + au_cachep[AuCache_FINFO] = AuCache(au_finfo);
16297 + if (au_cachep[AuCache_FINFO])
16298 + au_cachep[AuCache_VDIR] = AuCache(au_vdir);
16299 + if (au_cachep[AuCache_VDIR])
16300 + au_cachep[AuCache_DEHSTR] = AuCache(au_vdir_dehstr);
16301 + if (au_cachep[AuCache_DEHSTR])
16307 +static void au_cache_fin(void)
16310 + for (i = 0; i < AuCache_Last; i++)
16311 + if (au_cachep[i]) {
16312 + kmem_cache_destroy(au_cachep[i]);
16313 + au_cachep[i] = NULL;
16317 +/* ---------------------------------------------------------------------- */
16319 +int au_dir_roflags;
16322 + * functions for module interface.
16324 +MODULE_LICENSE("GPL");
16325 +/* MODULE_LICENSE("GPL v2"); */
16326 +MODULE_AUTHOR("Junjiro R. Okajima <aufs-users@lists.sourceforge.net>");
16327 +MODULE_DESCRIPTION(AUFS_NAME
16328 + " -- Advanced multi layered unification filesystem");
16329 +MODULE_VERSION(AUFS_VERSION);
16331 +/* it should be 'byte', but param_set_byte() prints it by "%c" */
16332 +short aufs_nwkq = AUFS_NWKQ_DEF;
16333 +MODULE_PARM_DESC(nwkq, "the number of workqueue thread, " AUFS_WKQ_NAME);
16334 +module_param_named(nwkq, aufs_nwkq, short, S_IRUGO);
16336 +/* this module parameter has no meaning when SYSFS is disabled */
16337 +int sysaufs_brs = 1;
16338 +MODULE_PARM_DESC(brs, "use <sysfs>/fs/aufs/si_*/brN");
16339 +module_param_named(brs, sysaufs_brs, int, S_IRUGO);
16341 +/* ---------------------------------------------------------------------- */
16343 +static char au_esc_chars[0x20 + 3]; /* 0x01-0x20, backslash, del, and NULL */
16345 +int au_seq_path(struct seq_file *seq, struct path *path)
16347 + return seq_path(seq, path, au_esc_chars);
16350 +/* ---------------------------------------------------------------------- */
16352 +static int __init aufs_init(void)
16357 + p = au_esc_chars;
16358 + for (i = 1; i <= ' '; i++)
16364 + au_dir_roflags = au_file_roflags(O_DIRECTORY | O_LARGEFILE);
16366 + sysaufs_brs_init();
16370 + if (unlikely(aufs_nwkq <= 0))
16373 + err = sysaufs_init();
16374 + if (unlikely(err))
16376 + err = au_wkq_init();
16377 + if (unlikely(err))
16378 + goto out_sysaufs;
16379 + err = au_hinotify_init();
16380 + if (unlikely(err))
16382 + err = au_sysrq_init();
16383 + if (unlikely(err))
16385 + err = au_cache_init();
16386 + if (unlikely(err))
16388 + err = register_filesystem(&aufs_fs_type);
16389 + if (unlikely(err))
16391 + pr_info(AUFS_NAME " " AUFS_VERSION "\n");
16392 + goto out; /* success */
16399 + au_hinotify_fin();
16408 +static void __exit aufs_exit(void)
16410 + unregister_filesystem(&aufs_fs_type);
16413 + au_hinotify_fin();
16418 +module_init(aufs_init);
16419 +module_exit(aufs_exit);
16420 diff --git a/fs/aufs/module.h b/fs/aufs/module.h
16421 new file mode 100644
16422 index 0000000..0825b79
16424 +++ b/fs/aufs/module.h
16427 + * Copyright (C) 2005-2009 Junjiro R. Okajima
16429 + * This program, aufs is free software; you can redistribute it and/or modify
16430 + * it under the terms of the GNU General Public License as published by
16431 + * the Free Software Foundation; either version 2 of the License, or
16432 + * (at your option) any later version.
16434 + * This program is distributed in the hope that it will be useful,
16435 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
16436 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16437 + * GNU General Public License for more details.
16439 + * You should have received a copy of the GNU General Public License
16440 + * along with this program; if not, write to the Free Software
16441 + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
16445 + * module initialization and module-global
16448 +#ifndef __AUFS_MODULE_H__
16449 +#define __AUFS_MODULE_H__
16453 +#include <linux/slab.h>
16458 +/* module parameters */
16459 +extern short aufs_nwkq;
16460 +extern int sysaufs_brs;
16462 +/* ---------------------------------------------------------------------- */
16464 +extern int au_dir_roflags;
16466 +void *au_kzrealloc(void *p, unsigned int nused, unsigned int new_sz, gfp_t gfp);
16467 +int au_seq_path(struct seq_file *seq, struct path *path);
16469 +/* ---------------------------------------------------------------------- */
16478 +#ifdef CONFIG_AUFS_HINOTIFY
16479 + AuCache_HINOTIFY,
16484 +#define AuCache(type) KMEM_CACHE(type, SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD)
16486 +extern struct kmem_cache *au_cachep[];
16488 +#define AuCacheFuncs(name, index) \
16489 +static inline struct au_##name *au_cache_alloc_##name(void) \
16490 +{ return kmem_cache_alloc(au_cachep[AuCache_##index], GFP_NOFS); } \
16491 +static inline void au_cache_free_##name(struct au_##name *p) \
16492 +{ kmem_cache_free(au_cachep[AuCache_##index], p); }
16494 +AuCacheFuncs(dinfo, DINFO);
16495 +AuCacheFuncs(icntnr, ICNTNR);
16496 +AuCacheFuncs(finfo, FINFO);
16497 +AuCacheFuncs(vdir, VDIR);
16498 +AuCacheFuncs(vdir_dehstr, DEHSTR);
16500 +/* ---------------------------------------------------------------------- */
16502 +#endif /* __KERNEL__ */
16503 +#endif /* __AUFS_MODULE_H__ */
16504 diff --git a/fs/aufs/opts.c b/fs/aufs/opts.c
16505 new file mode 100644
16506 index 0000000..b792b9f
16508 +++ b/fs/aufs/opts.c
16511 + * Copyright (C) 2005-2009 Junjiro R. Okajima
16513 + * This program, aufs is free software; you can redistribute it and/or modify
16514 + * it under the terms of the GNU General Public License as published by
16515 + * the Free Software Foundation; either version 2 of the License, or
16516 + * (at your option) any later version.
16518 + * This program is distributed in the hope that it will be useful,
16519 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
16520 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16521 + * GNU General Public License for more details.
16523 + * You should have received a copy of the GNU General Public License
16524 + * along with this program; if not, write to the Free Software
16525 + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
16529 + * mount options/flags
16532 +#include <linux/file.h>
16533 +#include <linux/namei.h>
16534 +#include <linux/types.h> /* a distribution requires */
16535 +#include <linux/parser.h>
16538 +/* ---------------------------------------------------------------------- */
16542 + Opt_add, Opt_del, Opt_mod, Opt_reorder, Opt_append, Opt_prepend,
16543 + Opt_idel, Opt_imod, Opt_ireorder,
16544 + Opt_dirwh, Opt_rdcache, Opt_rdblk, Opt_rdhash, Opt_rendir,
16545 + Opt_rdblk_def, Opt_rdhash_def,
16546 + Opt_xino, Opt_zxino, Opt_noxino,
16547 + Opt_trunc_xino, Opt_trunc_xino_v, Opt_notrunc_xino,
16548 + Opt_trunc_xino_path, Opt_itrunc_xino,
16549 + Opt_trunc_xib, Opt_notrunc_xib,
16550 + Opt_shwh, Opt_noshwh,
16551 + Opt_plink, Opt_noplink, Opt_list_plink,
16553 + /* Opt_lock, Opt_unlock, */
16554 + Opt_cmd, Opt_cmd_args,
16555 + Opt_diropq_a, Opt_diropq_w,
16556 + Opt_warn_perm, Opt_nowarn_perm,
16557 + Opt_wbr_copyup, Opt_wbr_create,
16558 + Opt_refrof, Opt_norefrof,
16559 + Opt_verbose, Opt_noverbose,
16560 + Opt_sum, Opt_nosum, Opt_wsum,
16561 + Opt_tail, Opt_ignore, Opt_ignore_silent, Opt_err
16564 +static match_table_t options = {
16565 + {Opt_br, "br=%s"},
16566 + {Opt_br, "br:%s"},
16568 + {Opt_add, "add=%d:%s"},
16569 + {Opt_add, "add:%d:%s"},
16570 + {Opt_add, "ins=%d:%s"},
16571 + {Opt_add, "ins:%d:%s"},
16572 + {Opt_append, "append=%s"},
16573 + {Opt_append, "append:%s"},
16574 + {Opt_prepend, "prepend=%s"},
16575 + {Opt_prepend, "prepend:%s"},
16577 + {Opt_del, "del=%s"},
16578 + {Opt_del, "del:%s"},
16579 + /* {Opt_idel, "idel:%d"}, */
16580 + {Opt_mod, "mod=%s"},
16581 + {Opt_mod, "mod:%s"},
16582 + /* {Opt_imod, "imod:%d:%s"}, */
16584 + {Opt_dirwh, "dirwh=%d"},
16586 + {Opt_xino, "xino=%s"},
16587 + {Opt_noxino, "noxino"},
16588 + {Opt_trunc_xino, "trunc_xino"},
16589 + {Opt_trunc_xino_v, "trunc_xino_v=%d:%d"},
16590 + {Opt_notrunc_xino, "notrunc_xino"},
16591 + {Opt_trunc_xino_path, "trunc_xino=%s"},
16592 + {Opt_itrunc_xino, "itrunc_xino=%d"},
16593 + /* {Opt_zxino, "zxino=%s"}, */
16594 + {Opt_trunc_xib, "trunc_xib"},
16595 + {Opt_notrunc_xib, "notrunc_xib"},
16597 + {Opt_plink, "plink"},
16598 + {Opt_noplink, "noplink"},
16599 +#ifdef CONFIG_AUFS_DEBUG
16600 + {Opt_list_plink, "list_plink"},
16603 + {Opt_udba, "udba=%s"},
16605 + {Opt_diropq_a, "diropq=always"},
16606 + {Opt_diropq_a, "diropq=a"},
16607 + {Opt_diropq_w, "diropq=whiteouted"},
16608 + {Opt_diropq_w, "diropq=w"},
16610 + {Opt_warn_perm, "warn_perm"},
16611 + {Opt_nowarn_perm, "nowarn_perm"},
16613 + /* keep them temporary */
16614 + {Opt_ignore_silent, "coo=%s"},
16615 + {Opt_ignore_silent, "nodlgt"},
16616 + {Opt_ignore_silent, "nodirperm1"},
16617 + {Opt_ignore_silent, "clean_plink"},
16619 +#ifdef CONFIG_AUFS_SHWH
16620 + {Opt_shwh, "shwh"},
16622 + {Opt_noshwh, "noshwh"},
16624 + {Opt_rendir, "rendir=%d"},
16626 + {Opt_refrof, "refrof"},
16627 + {Opt_norefrof, "norefrof"},
16629 + {Opt_verbose, "verbose"},
16630 + {Opt_verbose, "v"},
16631 + {Opt_noverbose, "noverbose"},
16632 + {Opt_noverbose, "quiet"},
16633 + {Opt_noverbose, "q"},
16634 + {Opt_noverbose, "silent"},
16636 + {Opt_sum, "sum"},
16637 + {Opt_nosum, "nosum"},
16638 + {Opt_wsum, "wsum"},
16640 + {Opt_rdcache, "rdcache=%d"},
16641 + {Opt_rdblk, "rdblk=%d"},
16642 + {Opt_rdblk_def, "rdblk=def"},
16643 + {Opt_rdhash, "rdhash=%d"},
16644 + {Opt_rdhash_def, "rdhash=def"},
16646 + {Opt_wbr_create, "create=%s"},
16647 + {Opt_wbr_create, "create_policy=%s"},
16648 + {Opt_wbr_copyup, "cpup=%s"},
16649 + {Opt_wbr_copyup, "copyup=%s"},
16650 + {Opt_wbr_copyup, "copyup_policy=%s"},
16652 + /* internal use for the scripts */
16653 + {Opt_ignore_silent, "si=%s"},
16655 + {Opt_br, "dirs=%s"},
16656 + {Opt_ignore, "debug=%d"},
16657 + {Opt_ignore, "delete=whiteout"},
16658 + {Opt_ignore, "delete=all"},
16659 + {Opt_ignore, "imap=%s"},
16664 +/* ---------------------------------------------------------------------- */
16666 +static const char *au_parser_pattern(int val, struct match_token *token)
16668 + while (token->pattern) {
16669 + if (token->token == val)
16670 + return token->pattern;
16677 +/* ---------------------------------------------------------------------- */
16679 +static match_table_t brperms = {
16680 + {AuBrPerm_RO, AUFS_BRPERM_RO},
16681 + {AuBrPerm_RR, AUFS_BRPERM_RR},
16682 + {AuBrPerm_RW, AUFS_BRPERM_RW},
16684 + {AuBrPerm_ROWH, AUFS_BRPERM_ROWH},
16685 + {AuBrPerm_RRWH, AUFS_BRPERM_RRWH},
16686 + {AuBrPerm_RWNoLinkWH, AUFS_BRPERM_RWNLWH},
16688 + {AuBrPerm_ROWH, "nfsro"},
16689 + {AuBrPerm_RO, NULL}
16692 +static int br_perm_val(char *perm)
16695 + substring_t args[MAX_OPT_ARGS];
16697 + val = match_token(perm, brperms, args);
16701 +const char *au_optstr_br_perm(int brperm)
16703 + return au_parser_pattern(brperm, (void *)brperms);
16706 +/* ---------------------------------------------------------------------- */
16708 +static match_table_t udbalevel = {
16709 + {AuOpt_UDBA_REVAL, "reval"},
16710 + {AuOpt_UDBA_NONE, "none"},
16711 +#ifdef CONFIG_AUFS_HINOTIFY
16712 + {AuOpt_UDBA_HINOTIFY, "inotify"},
16717 +static int udba_val(char *str)
16719 + substring_t args[MAX_OPT_ARGS];
16721 + return match_token(str, udbalevel, args);
16724 +const char *au_optstr_udba(int udba)
16726 + return au_parser_pattern(udba, (void *)udbalevel);
16729 +/* ---------------------------------------------------------------------- */
16731 +static match_table_t au_wbr_create_policy = {
16732 + {AuWbrCreate_TDP, "tdp"},
16733 + {AuWbrCreate_TDP, "top-down-parent"},
16734 + {AuWbrCreate_RR, "rr"},
16735 + {AuWbrCreate_RR, "round-robin"},
16736 + {AuWbrCreate_MFS, "mfs"},
16737 + {AuWbrCreate_MFS, "most-free-space"},
16738 + {AuWbrCreate_MFSV, "mfs:%d"},
16739 + {AuWbrCreate_MFSV, "most-free-space:%d"},
16741 + {AuWbrCreate_MFSRR, "mfsrr:%d"},
16742 + {AuWbrCreate_MFSRRV, "mfsrr:%d:%d"},
16743 + {AuWbrCreate_PMFS, "pmfs"},
16744 + {AuWbrCreate_PMFSV, "pmfs:%d"},
16750 + * cf. linux/lib/parser.c and cmdline.c
16751 + * gave up calling memparse() since it uses simple_strtoull() instead of
16754 +static int au_match_ull(substring_t *s, unsigned long long *result)
16757 + unsigned int len;
16761 + len = s->to - s->from;
16762 + if (len + 1 <= sizeof(a)) {
16763 + memcpy(a, s->from, len);
16765 + err = strict_strtoull(a, 0, result);
16770 +static int au_wbr_mfs_wmark(substring_t *arg, char *str,
16771 + struct au_opt_wbr_create *create)
16774 + unsigned long long ull;
16777 + if (!au_match_ull(arg, &ull))
16778 + create->mfsrr_watermark = ull;
16780 + AuErr("bad integer in %s\n", str);
16787 +static int au_wbr_mfs_sec(substring_t *arg, char *str,
16788 + struct au_opt_wbr_create *create)
16793 + if (!match_int(arg, &n) && 0 <= n)
16794 + create->mfs_second = n;
16796 + AuErr("bad integer in %s\n", str);
16803 +static int au_wbr_create_val(char *str, struct au_opt_wbr_create *create)
16806 + substring_t args[MAX_OPT_ARGS];
16808 + err = match_token(str, au_wbr_create_policy, args);
16809 + create->wbr_create = err;
16811 + case AuWbrCreate_MFSRRV:
16812 + e = au_wbr_mfs_wmark(&args[0], str, create);
16814 + e = au_wbr_mfs_sec(&args[1], str, create);
16818 + case AuWbrCreate_MFSRR:
16819 + e = au_wbr_mfs_wmark(&args[0], str, create);
16820 + if (unlikely(e)) {
16825 + case AuWbrCreate_MFS:
16826 + case AuWbrCreate_PMFS:
16827 + create->mfs_second = AUFS_MFS_SECOND_DEF;
16829 + case AuWbrCreate_MFSV:
16830 + case AuWbrCreate_PMFSV:
16831 + e = au_wbr_mfs_sec(&args[0], str, create);
16840 +const char *au_optstr_wbr_create(int wbr_create)
16842 + return au_parser_pattern(wbr_create, (void *)au_wbr_create_policy);
16845 +static match_table_t au_wbr_copyup_policy = {
16846 + {AuWbrCopyup_TDP, "tdp"},
16847 + {AuWbrCopyup_TDP, "top-down-parent"},
16848 + {AuWbrCopyup_BUP, "bup"},
16849 + {AuWbrCopyup_BUP, "bottom-up-parent"},
16850 + {AuWbrCopyup_BU, "bu"},
16851 + {AuWbrCopyup_BU, "bottom-up"},
16855 +static int au_wbr_copyup_val(char *str)
16857 + substring_t args[MAX_OPT_ARGS];
16859 + return match_token(str, au_wbr_copyup_policy, args);
16862 +const char *au_optstr_wbr_copyup(int wbr_copyup)
16864 + return au_parser_pattern(wbr_copyup, (void *)au_wbr_copyup_policy);
16867 +/* ---------------------------------------------------------------------- */
16869 +static const int lkup_dirflags = LOOKUP_FOLLOW | LOOKUP_DIRECTORY;
16871 +static void dump_opts(struct au_opts *opts)
16873 +#ifdef CONFIG_AUFS_DEBUG
16874 + /* reduce stack space */
16876 + struct au_opt_add *add;
16877 + struct au_opt_del *del;
16878 + struct au_opt_mod *mod;
16879 + struct au_opt_xino *xino;
16880 + struct au_opt_xino_itrunc *xino_itrunc;
16881 + struct au_opt_wbr_create *create;
16883 + struct au_opt *opt;
16886 + while (opt->type != Opt_tail) {
16887 + switch (opt->type) {
16889 + u.add = &opt->add;
16890 + AuDbg("add {b%d, %s, 0x%x, %p}\n",
16891 + u.add->bindex, u.add->pathname, u.add->perm,
16892 + u.add->path.dentry);
16896 + u.del = &opt->del;
16897 + AuDbg("del {%s, %p}\n",
16898 + u.del->pathname, u.del->h_path.dentry);
16902 + u.mod = &opt->mod;
16903 + AuDbg("mod {%s, 0x%x, %p}\n",
16904 + u.mod->path, u.mod->perm, u.mod->h_root);
16907 + u.add = &opt->add;
16908 + AuDbg("append {b%d, %s, 0x%x, %p}\n",
16909 + u.add->bindex, u.add->pathname, u.add->perm,
16910 + u.add->path.dentry);
16912 + case Opt_prepend:
16913 + u.add = &opt->add;
16914 + AuDbg("prepend {b%d, %s, 0x%x, %p}\n",
16915 + u.add->bindex, u.add->pathname, u.add->perm,
16916 + u.add->path.dentry);
16919 + AuDbg("dirwh %d\n", opt->dirwh);
16921 + case Opt_rdcache:
16922 + AuDbg("rdcache %d\n", opt->rdcache);
16925 + AuDbg("rdblk %u\n", opt->rdblk);
16927 + case Opt_rdblk_def:
16928 + AuDbg("rdblk_def\n");
16931 + AuDbg("rdhash %u\n", opt->rdhash);
16933 + case Opt_rdhash_def:
16934 + AuDbg("rdhash_def\n");
16937 + u.xino = &opt->xino;
16938 + AuDbg("xino {%s %.*s}\n",
16940 + AuDLNPair(u.xino->file->f_dentry));
16942 + case Opt_trunc_xino:
16943 + AuLabel(trunc_xino);
16945 + case Opt_notrunc_xino:
16946 + AuLabel(notrunc_xino);
16948 + case Opt_trunc_xino_path:
16949 + case Opt_itrunc_xino:
16950 + u.xino_itrunc = &opt->xino_itrunc;
16951 + AuDbg("trunc_xino %d\n", u.xino_itrunc->bindex);
16957 + case Opt_trunc_xib:
16958 + AuLabel(trunc_xib);
16960 + case Opt_notrunc_xib:
16961 + AuLabel(notrunc_xib);
16972 + case Opt_noplink:
16973 + AuLabel(noplink);
16975 + case Opt_list_plink:
16976 + AuLabel(list_plink);
16979 + AuDbg("udba %d, %s\n",
16980 + opt->udba, au_optstr_udba(opt->udba));
16982 + case Opt_diropq_a:
16983 + AuLabel(diropq_a);
16985 + case Opt_diropq_w:
16986 + AuLabel(diropq_w);
16988 + case Opt_warn_perm:
16989 + AuLabel(warn_perm);
16991 + case Opt_nowarn_perm:
16992 + AuLabel(nowarn_perm);
16997 + case Opt_norefrof:
16998 + AuLabel(norefrof);
17000 + case Opt_verbose:
17001 + AuLabel(verbose);
17003 + case Opt_noverbose:
17004 + AuLabel(noverbose);
17015 + case Opt_wbr_create:
17016 + u.create = &opt->wbr_create;
17017 + AuDbg("create %d, %s\n", u.create->wbr_create,
17018 + au_optstr_wbr_create(u.create->wbr_create));
17019 + switch (u.create->wbr_create) {
17020 + case AuWbrCreate_MFSV:
17021 + case AuWbrCreate_PMFSV:
17022 + AuDbg("%d sec\n", u.create->mfs_second);
17024 + case AuWbrCreate_MFSRR:
17025 + AuDbg("%llu watermark\n",
17026 + u.create->mfsrr_watermark);
17028 + case AuWbrCreate_MFSRRV:
17029 + AuDbg("%llu watermark, %d sec\n",
17030 + u.create->mfsrr_watermark,
17031 + u.create->mfs_second);
17035 + case Opt_wbr_copyup:
17036 + AuDbg("copyup %d, %s\n", opt->wbr_copyup,
17037 + au_optstr_wbr_copyup(opt->wbr_copyup));
17047 +void au_opts_free(struct au_opts *opts)
17049 + struct au_opt *opt;
17052 + while (opt->type != Opt_tail) {
17053 + switch (opt->type) {
17056 + case Opt_prepend:
17057 + path_put(&opt->add.path);
17061 + path_put(&opt->del.h_path);
17065 + dput(opt->mod.h_root);
17068 + fput(opt->xino.file);
17075 +static int opt_add(struct au_opt *opt, char *opt_str, unsigned long sb_flags,
17076 + aufs_bindex_t bindex)
17079 + struct nameidata nd;
17080 + struct au_opt_add *add = &opt->add;
17083 + add->bindex = bindex;
17084 + add->perm = AuBrPerm_Last;
17085 + add->pathname = opt_str;
17086 + p = strchr(opt_str, '=');
17090 + add->perm = br_perm_val(p);
17093 + err = vfsub_path_lookup(add->pathname, lkup_dirflags, &nd);
17095 + /* keep it path_get()ed */
17096 + add->path = nd.path;
17098 + add->perm = AuBrPerm_RO;
17099 + if (au_test_fs_rr(nd.path.dentry->d_sb))
17100 + add->perm = AuBrPerm_RR;
17101 + else if (!bindex && !(sb_flags & MS_RDONLY))
17102 + add->perm = AuBrPerm_RW;
17104 + opt->type = Opt_add;
17107 + AuErr("lookup failed %s (%d)\n", add->pathname, err);
17114 +static int au_opts_parse_del(struct au_opt_del *del, substring_t args[],
17115 + struct nameidata *nd)
17119 + del->pathname = args[0].from;
17120 + AuDbg("del path %s\n", del->pathname);
17122 + err = vfsub_path_lookup(del->pathname, lkup_dirflags, nd);
17124 + /* keep it get-ed */
17125 + del->h_path = nd->path;
17127 + AuErr("lookup failed %s (%d)\n", del->pathname, err);
17132 +#if 0 /* reserved for future use */
17133 +static int au_opts_parse_idel(struct super_block *sb, aufs_bindex_t bindex,
17134 + struct au_opt_del *del, substring_t args[])
17137 + struct dentry *root;
17140 + root = sb->s_root;
17141 + aufs_read_lock(root, AuLock_FLUSH);
17142 + if (bindex < 0 || au_sbend(sb) < bindex) {
17143 + AuErr("out of bounds, %d\n", bindex);
17148 + del->h_path.dentry = dget(au_h_dptr(root, bindex));
17149 + del->h_path.mnt = mntget(au_sbr_mnt(sb, bindex));
17152 + aufs_read_unlock(root, !AuLock_IR);
17157 +static int au_opts_parse_mod(struct au_opt_mod *mod, substring_t args[],
17158 + struct nameidata *nd)
17164 + mod->path = args[0].from;
17165 + p = strchr(mod->path, '=');
17166 + if (unlikely(!p)) {
17167 + AuErr("no permssion %s\n", args[0].from);
17172 + err = vfsub_path_lookup(mod->path, lkup_dirflags, nd);
17173 + if (unlikely(err)) {
17174 + AuErr("lookup failed %s (%d)\n", mod->path, err);
17178 + mod->perm = br_perm_val(p);
17179 + AuDbg("mod path %s, perm 0x%x, %s\n", mod->path, mod->perm, p);
17180 + mod->h_root = dget(nd->path.dentry);
17181 + path_put(&nd->path);
17187 +#if 0 /* reserved for future use */
17188 +static int au_opts_parse_imod(struct super_block *sb, aufs_bindex_t bindex,
17189 + struct au_opt_mod *mod, substring_t args[])
17192 + struct dentry *root;
17195 + root = sb->s_root;
17196 + aufs_read_lock(root, AuLock_FLUSH);
17197 + if (bindex < 0 || au_sbend(sb) < bindex) {
17198 + AuErr("out of bounds, %d\n", bindex);
17203 + mod->perm = br_perm_val(args[1].from);
17204 + AuDbg("mod path %s, perm 0x%x, %s\n",
17205 + mod->path, mod->perm, args[1].from);
17206 + mod->h_root = dget(au_h_dptr(root, bindex));
17209 + aufs_read_unlock(root, !AuLock_IR);
17214 +static int au_opts_parse_xino(struct super_block *sb, struct au_opt_xino *xino,
17215 + substring_t args[])
17218 + struct file *file;
17220 + file = au_xino_create(sb, args[0].from, /*silent*/0);
17221 + err = PTR_ERR(file);
17222 + if (IS_ERR(file))
17226 + if (unlikely(file->f_dentry->d_sb == sb)) {
17228 + AuErr("%s must be outside\n", args[0].from);
17233 + xino->file = file;
17234 + xino->path = args[0].from;
17241 +int au_opts_parse_xino_itrunc_path(struct super_block *sb,
17242 + struct au_opt_xino_itrunc *xino_itrunc,
17243 + substring_t args[], struct nameidata *nd)
17246 + aufs_bindex_t bend, bindex;
17247 + struct dentry *root;
17249 + err = vfsub_path_lookup(args[0].from, lkup_dirflags, nd);
17250 + if (unlikely(err)) {
17251 + AuErr("lookup failed %s (%d)\n", args[0].from, err);
17255 + xino_itrunc->bindex = -1;
17256 + root = sb->s_root;
17257 + aufs_read_lock(root, AuLock_FLUSH);
17258 + bend = au_sbend(sb);
17259 + for (bindex = 0; bindex <= bend; bindex++) {
17260 + if (au_h_dptr(root, bindex) == nd->path.dentry) {
17261 + xino_itrunc->bindex = bindex;
17265 + aufs_read_unlock(root, !AuLock_IR);
17266 + path_put(&nd->path);
17268 + if (unlikely(xino_itrunc->bindex < 0)) {
17269 + AuErr("no such branch %s\n", args[0].from);
17277 +/* called without aufs lock */
17278 +int au_opts_parse(struct super_block *sb, char *str, struct au_opts *opts)
17280 + int err, n, token;
17281 + aufs_bindex_t bindex;
17282 + unsigned char skipped;
17283 + struct dentry *root;
17284 + struct au_opt *opt, *opt_tail;
17286 + /* reduce the stack space */
17288 + struct au_opt_xino_itrunc *xino_itrunc;
17289 + struct au_opt_wbr_create *create;
17292 + substring_t args[MAX_OPT_ARGS];
17293 + struct nameidata nd;
17297 + a = kmalloc(sizeof(*a), GFP_NOFS);
17298 + if (unlikely(!a))
17301 + root = sb->s_root;
17305 + opt_tail = opt + opts->max_opt - 1;
17306 + opt->type = Opt_tail;
17307 + while (!err && (opt_str = strsep(&str, ",")) && *opt_str) {
17310 + token = match_token(opt_str, options, a->args);
17314 + while (!err && (opt_str = strsep(&a->args[0].from, ":"))
17316 + err = opt_add(opt, opt_str, opts->sb_flags,
17318 + if (unlikely(!err && ++opt > opt_tail)) {
17322 + opt->type = Opt_tail;
17327 + if (unlikely(match_int(&a->args[0], &n))) {
17328 + AuErr("bad integer in %s\n", opt_str);
17332 + err = opt_add(opt, a->args[1].from, opts->sb_flags,
17335 + opt->type = token;
17338 + err = opt_add(opt, a->args[0].from, opts->sb_flags,
17339 + /*dummy bindex*/1);
17341 + opt->type = token;
17343 + case Opt_prepend:
17344 + err = opt_add(opt, a->args[0].from, opts->sb_flags,
17347 + opt->type = token;
17350 + err = au_opts_parse_del(&opt->del, a->args, &a->nd);
17352 + opt->type = token;
17354 +#if 0 /* reserved for future use */
17356 + del->pathname = "(indexed)";
17357 + if (unlikely(match_int(&args[0], &n))) {
17358 + AuErr("bad integer in %s\n", opt_str);
17361 + err = au_opts_parse_idel(sb, n, &opt->del, a->args);
17363 + opt->type = token;
17367 + err = au_opts_parse_mod(&opt->mod, a->args, &a->nd);
17369 + opt->type = token;
17371 +#ifdef IMOD /* reserved for future use */
17373 + u.mod->path = "(indexed)";
17374 + if (unlikely(match_int(&a->args[0], &n))) {
17375 + AuErr("bad integer in %s\n", opt_str);
17378 + err = au_opts_parse_imod(sb, n, &opt->mod, a->args);
17380 + opt->type = token;
17384 + err = au_opts_parse_xino(sb, &opt->xino, a->args);
17386 + opt->type = token;
17389 + case Opt_trunc_xino_path:
17390 + err = au_opts_parse_xino_itrunc_path
17391 + (sb, &opt->xino_itrunc, a->args, &a->nd);
17393 + opt->type = token;
17396 + case Opt_itrunc_xino:
17397 + u.xino_itrunc = &opt->xino_itrunc;
17398 + if (unlikely(match_int(&a->args[0], &n))) {
17399 + AuErr("bad integer in %s\n", opt_str);
17402 + u.xino_itrunc->bindex = n;
17403 + aufs_read_lock(root, AuLock_FLUSH);
17404 + if (n < 0 || au_sbend(sb) < n) {
17405 + AuErr("out of bounds, %d\n", n);
17406 + aufs_read_unlock(root, !AuLock_IR);
17409 + aufs_read_unlock(root, !AuLock_IR);
17411 + opt->type = token;
17415 + if (unlikely(match_int(&a->args[0], &opt->dirwh)))
17418 + opt->type = token;
17421 + case Opt_rdcache:
17422 + if (unlikely(match_int(&a->args[0], &opt->rdcache)))
17425 + opt->type = token;
17428 + if (unlikely(match_int(&a->args[0], &n)
17430 + || n > KMALLOC_MAX_SIZE)) {
17431 + AuErr("bad integer in %s\n", opt_str);
17434 + if (unlikely(n && n < NAME_MAX)) {
17435 + AuErr("rdblk must be larger than %d\n",
17441 + opt->type = token;
17444 + if (unlikely(match_int(&a->args[0], &n)
17446 + || n * sizeof(struct hlist_head)
17447 + > KMALLOC_MAX_SIZE)) {
17448 + AuErr("bad integer in %s\n", opt_str);
17453 + opt->type = token;
17456 + case Opt_trunc_xino:
17457 + case Opt_notrunc_xino:
17459 + case Opt_trunc_xib:
17460 + case Opt_notrunc_xib:
17464 + case Opt_noplink:
17465 + case Opt_list_plink:
17466 + case Opt_diropq_a:
17467 + case Opt_diropq_w:
17468 + case Opt_warn_perm:
17469 + case Opt_nowarn_perm:
17471 + case Opt_norefrof:
17472 + case Opt_verbose:
17473 + case Opt_noverbose:
17477 + case Opt_rdblk_def:
17478 + case Opt_rdhash_def:
17480 + opt->type = token;
17484 + opt->udba = udba_val(a->args[0].from);
17485 + if (opt->udba >= 0) {
17487 + opt->type = token;
17489 + AuErr("wrong value, %s\n", opt_str);
17492 + case Opt_wbr_create:
17493 + u.create = &opt->wbr_create;
17494 + u.create->wbr_create
17495 + = au_wbr_create_val(a->args[0].from, u.create);
17496 + if (u.create->wbr_create >= 0) {
17498 + opt->type = token;
17500 + AuErr("wrong value, %s\n", opt_str);
17502 + case Opt_wbr_copyup:
17503 + opt->wbr_copyup = au_wbr_copyup_val(a->args[0].from);
17504 + if (opt->wbr_copyup >= 0) {
17506 + opt->type = token;
17508 + AuErr("wrong value, %s\n", opt_str);
17512 + AuWarn("ignored %s\n", opt_str);
17514 + case Opt_ignore_silent:
17519 + AuErr("unknown option %s\n", opt_str);
17523 + if (!err && !skipped) {
17524 + if (unlikely(++opt > opt_tail)) {
17527 + opt->type = Opt_tail;
17530 + opt->type = Opt_tail;
17536 + if (unlikely(err))
17537 + au_opts_free(opts);
17543 +static int au_opt_wbr_create(struct super_block *sb,
17544 + struct au_opt_wbr_create *create)
17547 + struct au_sbinfo *sbinfo;
17549 + SiMustWriteLock(sb);
17551 + err = 1; /* handled */
17552 + sbinfo = au_sbi(sb);
17553 + if (sbinfo->si_wbr_create_ops->fin) {
17554 + err = sbinfo->si_wbr_create_ops->fin(sb);
17559 + sbinfo->si_wbr_create = create->wbr_create;
17560 + sbinfo->si_wbr_create_ops = au_wbr_create_ops + create->wbr_create;
17561 + switch (create->wbr_create) {
17562 + case AuWbrCreate_MFSRRV:
17563 + case AuWbrCreate_MFSRR:
17564 + sbinfo->si_wbr_mfs.mfsrr_watermark = create->mfsrr_watermark;
17566 + case AuWbrCreate_MFS:
17567 + case AuWbrCreate_MFSV:
17568 + case AuWbrCreate_PMFS:
17569 + case AuWbrCreate_PMFSV:
17570 + sbinfo->si_wbr_mfs.mfs_expire = create->mfs_second * HZ;
17574 + if (sbinfo->si_wbr_create_ops->init)
17575 + sbinfo->si_wbr_create_ops->init(sb); /* ignore */
17582 + * plus: processed without an error
17583 + * zero: unprocessed
17585 +static int au_opt_simple(struct super_block *sb, struct au_opt *opt,
17586 + struct au_opts *opts)
17589 + struct au_sbinfo *sbinfo;
17591 + SiMustWriteLock(sb);
17593 + err = 1; /* handled */
17594 + sbinfo = au_sbi(sb);
17595 + switch (opt->type) {
17597 + sbinfo->si_mntflags &= ~AuOptMask_UDBA;
17598 + sbinfo->si_mntflags |= opt->udba;
17599 + opts->given_udba |= opt->udba;
17603 + au_opt_set(sbinfo->si_mntflags, PLINK);
17605 + case Opt_noplink:
17606 + if (au_opt_test(sbinfo->si_mntflags, PLINK))
17607 + au_plink_put(sb);
17608 + au_opt_clr(sbinfo->si_mntflags, PLINK);
17610 + case Opt_list_plink:
17611 + if (au_opt_test(sbinfo->si_mntflags, PLINK))
17612 + au_plink_list(sb);
17615 + case Opt_diropq_a:
17616 + au_opt_set(sbinfo->si_mntflags, ALWAYS_DIROPQ);
17618 + case Opt_diropq_w:
17619 + au_opt_clr(sbinfo->si_mntflags, ALWAYS_DIROPQ);
17622 + case Opt_warn_perm:
17623 + au_opt_set(sbinfo->si_mntflags, WARN_PERM);
17625 + case Opt_nowarn_perm:
17626 + au_opt_clr(sbinfo->si_mntflags, WARN_PERM);
17630 + au_opt_set(sbinfo->si_mntflags, REFROF);
17632 + case Opt_norefrof:
17633 + au_opt_clr(sbinfo->si_mntflags, REFROF);
17636 + case Opt_verbose:
17637 + au_opt_set(sbinfo->si_mntflags, VERBOSE);
17639 + case Opt_noverbose:
17640 + au_opt_clr(sbinfo->si_mntflags, VERBOSE);
17644 + au_opt_set(sbinfo->si_mntflags, SUM);
17647 + au_opt_clr(sbinfo->si_mntflags, SUM);
17648 + au_opt_set(sbinfo->si_mntflags, SUM_W);
17650 + au_opt_clr(sbinfo->si_mntflags, SUM);
17651 + au_opt_clr(sbinfo->si_mntflags, SUM_W);
17654 + case Opt_wbr_create:
17655 + err = au_opt_wbr_create(sb, &opt->wbr_create);
17657 + case Opt_wbr_copyup:
17658 + sbinfo->si_wbr_copyup = opt->wbr_copyup;
17659 + sbinfo->si_wbr_copyup_ops = au_wbr_copyup_ops + opt->wbr_copyup;
17663 + sbinfo->si_dirwh = opt->dirwh;
17666 + case Opt_rdcache:
17667 + sbinfo->si_rdcache = opt->rdcache * HZ;
17670 + sbinfo->si_rdblk = opt->rdblk;
17672 + case Opt_rdblk_def:
17673 + sbinfo->si_rdblk = AUFS_RDBLK_DEF;
17676 + sbinfo->si_rdhash = opt->rdhash;
17678 + case Opt_rdhash_def:
17679 + sbinfo->si_rdhash = AUFS_RDHASH_DEF;
17683 + au_opt_set(sbinfo->si_mntflags, SHWH);
17686 + au_opt_clr(sbinfo->si_mntflags, SHWH);
17689 + case Opt_trunc_xino:
17690 + au_opt_set(sbinfo->si_mntflags, TRUNC_XINO);
17692 + case Opt_notrunc_xino:
17693 + au_opt_clr(sbinfo->si_mntflags, TRUNC_XINO);
17696 + case Opt_trunc_xino_path:
17697 + case Opt_itrunc_xino:
17698 + err = au_xino_trunc(sb, opt->xino_itrunc.bindex);
17703 + case Opt_trunc_xib:
17704 + au_fset_opts(opts->flags, TRUNC_XIB);
17706 + case Opt_notrunc_xib:
17707 + au_fclr_opts(opts->flags, TRUNC_XIB);
17719 + * returns tri-state.
17720 + * plus: processed without an error
17721 + * zero: unprocessed
17724 +static int au_opt_br(struct super_block *sb, struct au_opt *opt,
17725 + struct au_opts *opts)
17727 + int err, do_refresh;
17730 + switch (opt->type) {
17732 + opt->add.bindex = au_sbend(sb) + 1;
17733 + if (opt->add.bindex < 0)
17734 + opt->add.bindex = 0;
17736 + case Opt_prepend:
17737 + opt->add.bindex = 0;
17740 + err = au_br_add(sb, &opt->add,
17741 + au_ftest_opts(opts->flags, REMOUNT));
17744 + au_fset_opts(opts->flags, REFRESH_DIR);
17745 + if (au_br_whable(opt->add.perm))
17746 + au_fset_opts(opts->flags, REFRESH_NONDIR);
17752 + err = au_br_del(sb, &opt->del,
17753 + au_ftest_opts(opts->flags, REMOUNT));
17756 + au_fset_opts(opts->flags, TRUNC_XIB);
17757 + au_fset_opts(opts->flags, REFRESH_DIR);
17758 + au_fset_opts(opts->flags, REFRESH_NONDIR);
17764 + err = au_br_mod(sb, &opt->mod,
17765 + au_ftest_opts(opts->flags, REMOUNT),
17769 + if (do_refresh) {
17770 + au_fset_opts(opts->flags, REFRESH_DIR);
17771 + au_fset_opts(opts->flags, REFRESH_NONDIR);
17780 +static int au_opt_xino(struct super_block *sb, struct au_opt *opt,
17781 + struct au_opt_xino **opt_xino,
17782 + struct au_opts *opts)
17785 + aufs_bindex_t bend, bindex;
17786 + struct dentry *root, *parent, *h_root;
17789 + switch (opt->type) {
17791 + err = au_xino_set(sb, &opt->xino,
17792 + !!au_ftest_opts(opts->flags, REMOUNT));
17793 + if (unlikely(err))
17796 + *opt_xino = &opt->xino;
17797 + au_xino_brid_set(sb, -1);
17799 + /* safe d_parent access */
17800 + parent = opt->xino.file->f_dentry->d_parent;
17801 + root = sb->s_root;
17802 + bend = au_sbend(sb);
17803 + for (bindex = 0; bindex <= bend; bindex++) {
17804 + h_root = au_h_dptr(root, bindex);
17805 + if (h_root == parent) {
17806 + au_xino_brid_set(sb, au_sbr_id(sb, bindex));
17814 + au_xino_brid_set(sb, -1);
17815 + *opt_xino = (void *)-1;
17822 +int au_opts_verify(struct super_block *sb, unsigned long sb_flags,
17823 + unsigned int pending)
17826 + aufs_bindex_t bindex, bend;
17827 + unsigned char do_plink, skip, do_free;
17828 + struct au_branch *br;
17829 + struct au_wbr *wbr;
17830 + struct dentry *root;
17831 + struct inode *dir, *h_dir;
17832 + struct au_sbinfo *sbinfo;
17833 + struct au_hinode *hdir;
17835 + SiMustAnyLock(sb);
17837 + sbinfo = au_sbi(sb);
17838 + AuDebugOn(!(sbinfo->si_mntflags & AuOptMask_UDBA));
17840 + if (!(sb_flags & MS_RDONLY)) {
17841 + if (unlikely(!au_br_writable(au_sbr_perm(sb, 0))))
17842 + AuWarn("first branch should be rw\n");
17843 + if (unlikely(au_opt_test(sbinfo->si_mntflags, SHWH)))
17844 + AuWarn("shwh should be used with ro\n");
17847 + if (au_opt_test((sbinfo->si_mntflags | pending), UDBA_HINOTIFY)
17848 + && !au_opt_test(sbinfo->si_mntflags, XINO))
17849 + AuWarn("udba=inotify requires xino\n");
17852 + root = sb->s_root;
17853 + dir = sb->s_root->d_inode;
17854 + do_plink = !!au_opt_test(sbinfo->si_mntflags, PLINK);
17855 + bend = au_sbend(sb);
17856 + for (bindex = 0; !err && bindex <= bend; bindex++) {
17858 + h_dir = au_h_iptr(dir, bindex);
17859 + br = au_sbr(sb, bindex);
17862 + wbr = br->br_wbr;
17864 + wbr_wh_read_lock(wbr);
17866 + switch (br->br_perm) {
17867 + case AuBrPerm_RO:
17868 + case AuBrPerm_ROWH:
17869 + case AuBrPerm_RR:
17870 + case AuBrPerm_RRWH:
17873 + || (!wbr->wbr_whbase
17874 + && !wbr->wbr_plink
17875 + && !wbr->wbr_orph));
17878 + case AuBrPerm_RWNoLinkWH:
17879 + /* skip = (!br->br_whbase && !br->br_orph); */
17880 + skip = (!wbr || !wbr->wbr_whbase);
17881 + if (skip && wbr) {
17883 + skip = !!wbr->wbr_plink;
17885 + skip = !wbr->wbr_plink;
17889 + case AuBrPerm_RW:
17890 + /* skip = (br->br_whbase && br->br_ohph); */
17891 + skip = (wbr && wbr->wbr_whbase);
17894 + skip = !!wbr->wbr_plink;
17896 + skip = !wbr->wbr_plink;
17904 + wbr_wh_read_unlock(wbr);
17909 + hdir = au_hi(dir, bindex);
17910 + au_hin_imtx_lock_nested(hdir, AuLsc_I_PARENT);
17912 + wbr_wh_write_lock(wbr);
17913 + err = au_wh_init(au_h_dptr(root, bindex), br, sb);
17915 + wbr_wh_write_unlock(wbr);
17916 + au_hin_imtx_unlock(hdir);
17918 + if (!err && do_free) {
17920 + br->br_wbr = NULL;
17927 +int au_opts_mount(struct super_block *sb, struct au_opts *opts)
17930 + unsigned int tmp;
17931 + aufs_bindex_t bend;
17932 + struct au_opt *opt;
17933 + struct au_opt_xino *opt_xino, xino;
17934 + struct au_sbinfo *sbinfo;
17936 + SiMustWriteLock(sb);
17941 + while (err >= 0 && opt->type != Opt_tail)
17942 + err = au_opt_simple(sb, opt++, opts);
17945 + else if (unlikely(err < 0))
17948 + /* disable xino and udba temporary */
17949 + sbinfo = au_sbi(sb);
17950 + tmp = sbinfo->si_mntflags;
17951 + au_opt_clr(sbinfo->si_mntflags, XINO);
17952 + au_opt_set_udba(sbinfo->si_mntflags, UDBA_REVAL);
17955 + while (err >= 0 && opt->type != Opt_tail)
17956 + err = au_opt_br(sb, opt++, opts);
17959 + else if (unlikely(err < 0))
17962 + bend = au_sbend(sb);
17963 + if (unlikely(bend < 0)) {
17965 + AuErr("no branches\n");
17969 + if (au_opt_test(tmp, XINO))
17970 + au_opt_set(sbinfo->si_mntflags, XINO);
17972 + while (!err && opt->type != Opt_tail)
17973 + err = au_opt_xino(sb, opt++, &opt_xino, opts);
17974 + if (unlikely(err))
17977 + err = au_opts_verify(sb, sb->s_flags, tmp);
17978 + if (unlikely(err))
17981 + /* restore xino */
17982 + if (au_opt_test(tmp, XINO) && !opt_xino) {
17983 + xino.file = au_xino_def(sb);
17984 + err = PTR_ERR(xino.file);
17985 + if (IS_ERR(xino.file))
17988 + err = au_xino_set(sb, &xino, /*remount*/0);
17990 + if (unlikely(err))
17994 + /* restore udba */
17995 + sbinfo->si_mntflags &= ~AuOptMask_UDBA;
17996 + sbinfo->si_mntflags |= (tmp & AuOptMask_UDBA);
17997 + if (au_opt_test(tmp, UDBA_HINOTIFY)) {
17998 + struct inode *dir = sb->s_root->d_inode;
17999 + au_reset_hinotify(dir,
18000 + au_hi_flags(dir, /*isdir*/1) & ~AuHi_XINO);
18007 +int au_opts_remount(struct super_block *sb, struct au_opts *opts)
18010 + struct inode *dir;
18011 + struct au_opt_xino *opt_xino;
18012 + struct au_opt *opt;
18013 + struct au_sbinfo *sbinfo;
18015 + SiMustWriteLock(sb);
18017 + dir = sb->s_root->d_inode;
18018 + sbinfo = au_sbi(sb);
18022 + while (err >= 0 && opt->type != Opt_tail) {
18023 + err = au_opt_simple(sb, opt, opts);
18025 + err = au_opt_br(sb, opt, opts);
18027 + err = au_opt_xino(sb, opt, &opt_xino, opts);
18033 + /* go on even err */
18035 + rerr = au_opts_verify(sb, opts->sb_flags, /*pending*/0);
18036 + if (unlikely(rerr && !err))
18039 + if (au_ftest_opts(opts->flags, TRUNC_XIB)) {
18040 + rerr = au_xib_trunc(sb);
18041 + if (unlikely(rerr && !err))
18045 + /* will be handled by the caller */
18046 + if (!au_ftest_opts(opts->flags, REFRESH_DIR)
18047 + && (opts->given_udba || au_opt_test(sbinfo->si_mntflags, XINO)))
18048 + au_fset_opts(opts->flags, REFRESH_DIR);
18050 + AuDbg("status 0x%x\n", opts->flags);
18054 +/* ---------------------------------------------------------------------- */
18056 +unsigned int au_opt_udba(struct super_block *sb)
18058 + return au_mntflags(sb) & AuOptMask_UDBA;
18060 diff --git a/fs/aufs/opts.h b/fs/aufs/opts.h
18061 new file mode 100644
18062 index 0000000..27439b1
18064 +++ b/fs/aufs/opts.h
18067 + * Copyright (C) 2005-2009 Junjiro R. Okajima
18069 + * This program, aufs is free software; you can redistribute it and/or modify
18070 + * it under the terms of the GNU General Public License as published by
18071 + * the Free Software Foundation; either version 2 of the License, or
18072 + * (at your option) any later version.
18074 + * This program is distributed in the hope that it will be useful,
18075 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
18076 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18077 + * GNU General Public License for more details.
18079 + * You should have received a copy of the GNU General Public License
18080 + * along with this program; if not, write to the Free Software
18081 + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
18085 + * mount options/flags
18088 +#ifndef __AUFS_OPTS_H__
18089 +#define __AUFS_OPTS_H__
18093 +#include <linux/path.h>
18094 +#include <linux/aufs_type.h>
18097 +struct super_block;
18099 +/* ---------------------------------------------------------------------- */
18102 +#define AuOpt_XINO 1 /* external inode number bitmap
18103 + and translation table */
18104 +#define AuOpt_TRUNC_XINO (1 << 1) /* truncate xino files */
18105 +#define AuOpt_UDBA_NONE (1 << 2) /* users direct branch access */
18106 +#define AuOpt_UDBA_REVAL (1 << 3)
18107 +#define AuOpt_UDBA_HINOTIFY (1 << 4)
18108 +#define AuOpt_SHWH (1 << 5) /* show whiteout */
18109 +#define AuOpt_PLINK (1 << 6) /* pseudo-link */
18110 +#define AuOpt_DIRPERM1 (1 << 7) /* unimplemented */
18111 +#define AuOpt_REFROF (1 << 8) /* unimplemented */
18112 +#define AuOpt_ALWAYS_DIROPQ (1 << 9) /* policy to creating diropq */
18113 +#define AuOpt_SUM (1 << 10) /* summation for statfs(2) */
18114 +#define AuOpt_SUM_W (1 << 11) /* unimplemented */
18115 +#define AuOpt_WARN_PERM (1 << 12) /* warn when add-branch */
18116 +#define AuOpt_VERBOSE (1 << 13) /* busy inode when del-branch */
18118 +#ifndef CONFIG_AUFS_HINOTIFY
18119 +#undef AuOpt_UDBA_HINOTIFY
18120 +#define AuOpt_UDBA_HINOTIFY 0
18122 +#ifndef CONFIG_AUFS_SHWH
18124 +#define AuOpt_SHWH 0
18127 +#define AuOpt_Def (AuOpt_XINO \
18128 + | AuOpt_UDBA_REVAL \
18130 + /* | AuOpt_DIRPERM1 */ \
18131 + | AuOpt_WARN_PERM)
18132 +#define AuOptMask_UDBA (AuOpt_UDBA_NONE \
18133 + | AuOpt_UDBA_REVAL \
18134 + | AuOpt_UDBA_HINOTIFY)
18136 +#define au_opt_test(flags, name) (flags & AuOpt_##name)
18137 +#define au_opt_set(flags, name) do { \
18138 + BUILD_BUG_ON(AuOpt_##name & AuOptMask_UDBA); \
18139 + ((flags) |= AuOpt_##name); \
18141 +#define au_opt_set_udba(flags, name) do { \
18142 + (flags) &= ~AuOptMask_UDBA; \
18143 + ((flags) |= AuOpt_##name); \
18145 +#define au_opt_clr(flags, name) { ((flags) &= ~AuOpt_##name); }
18147 +/* ---------------------------------------------------------------------- */
18149 +/* policies to select one among multiple writable branches */
18151 + AuWbrCreate_TDP, /* top down parent */
18152 + AuWbrCreate_RR, /* round robin */
18153 + AuWbrCreate_MFS, /* most free space */
18154 + AuWbrCreate_MFSV, /* mfs with seconds */
18155 + AuWbrCreate_MFSRR, /* mfs then rr */
18156 + AuWbrCreate_MFSRRV, /* mfs then rr with seconds */
18157 + AuWbrCreate_PMFS, /* parent and mfs */
18158 + AuWbrCreate_PMFSV, /* parent and mfs with seconds */
18160 + AuWbrCreate_Def = AuWbrCreate_TDP
18164 + AuWbrCopyup_TDP, /* top down parent */
18165 + AuWbrCopyup_BUP, /* bottom up parent */
18166 + AuWbrCopyup_BU, /* bottom up */
18168 + AuWbrCopyup_Def = AuWbrCopyup_TDP
18171 +/* ---------------------------------------------------------------------- */
18173 +struct au_opt_add {
18174 + aufs_bindex_t bindex;
18177 + struct path path;
18180 +struct au_opt_del {
18182 + struct path h_path;
18185 +struct au_opt_mod {
18188 + struct dentry *h_root;
18191 +struct au_opt_xino {
18193 + struct file *file;
18196 +struct au_opt_xino_itrunc {
18197 + aufs_bindex_t bindex;
18200 +struct au_opt_wbr_create {
18203 + unsigned long long mfsrr_watermark;
18209 + struct au_opt_xino xino;
18210 + struct au_opt_xino_itrunc xino_itrunc;
18211 + struct au_opt_add add;
18212 + struct au_opt_del del;
18213 + struct au_opt_mod mod;
18216 + unsigned int rdblk;
18217 + unsigned int rdhash;
18219 + struct au_opt_wbr_create wbr_create;
18225 +#define AuOpts_REMOUNT 1
18226 +#define AuOpts_REFRESH_DIR (1 << 1)
18227 +#define AuOpts_REFRESH_NONDIR (1 << 2)
18228 +#define AuOpts_TRUNC_XIB (1 << 3)
18229 +#define au_ftest_opts(flags, name) ((flags) & AuOpts_##name)
18230 +#define au_fset_opts(flags, name) { (flags) |= AuOpts_##name; }
18231 +#define au_fclr_opts(flags, name) { (flags) &= ~AuOpts_##name; }
18234 + struct au_opt *opt;
18237 + unsigned int given_udba;
18238 + unsigned int flags;
18239 + unsigned long sb_flags;
18242 +/* ---------------------------------------------------------------------- */
18244 +const char *au_optstr_br_perm(int brperm);
18245 +const char *au_optstr_udba(int udba);
18246 +const char *au_optstr_wbr_copyup(int wbr_copyup);
18247 +const char *au_optstr_wbr_create(int wbr_create);
18249 +void au_opts_free(struct au_opts *opts);
18250 +int au_opts_parse(struct super_block *sb, char *str, struct au_opts *opts);
18251 +int au_opts_verify(struct super_block *sb, unsigned long sb_flags,
18252 + unsigned int pending);
18253 +int au_opts_mount(struct super_block *sb, struct au_opts *opts);
18254 +int au_opts_remount(struct super_block *sb, struct au_opts *opts);
18256 +unsigned int au_opt_udba(struct super_block *sb);
18258 +/* ---------------------------------------------------------------------- */
18260 +#endif /* __KERNEL__ */
18261 +#endif /* __AUFS_OPTS_H__ */
18262 diff --git a/fs/aufs/plink.c b/fs/aufs/plink.c
18263 new file mode 100644
18264 index 0000000..0fe806e
18266 +++ b/fs/aufs/plink.c
18269 + * Copyright (C) 2005-2009 Junjiro R. Okajima
18271 + * This program, aufs is free software; you can redistribute it and/or modify
18272 + * it under the terms of the GNU General Public License as published by
18273 + * the Free Software Foundation; either version 2 of the License, or
18274 + * (at your option) any later version.
18276 + * This program is distributed in the hope that it will be useful,
18277 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
18278 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18279 + * GNU General Public License for more details.
18281 + * You should have received a copy of the GNU General Public License
18282 + * along with this program; if not, write to the Free Software
18283 + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
18293 + * during a user process maintains the pseudo-links,
18294 + * prohibit adding a new plink and branch manipulation.
18296 +void au_plink_maint_block(struct super_block *sb)
18298 + struct au_sbinfo *sbi = au_sbi(sb);
18300 + SiMustAnyLock(sb);
18302 + /* gave up wake_up_bit() */
18303 + wait_event(sbi->si_plink_wq, !sbi->si_plink_maint);
18306 +void au_plink_maint_leave(struct file *file)
18308 + struct au_sbinfo *sbinfo;
18311 + AuDebugOn(atomic_long_read(&file->f_count));
18313 + sbinfo = au_sbi(file->f_dentry->d_sb);
18314 + spin_lock(&sbinfo->si_plink_maint_lock);
18315 + iam = (sbinfo->si_plink_maint == file);
18317 + sbinfo->si_plink_maint = NULL;
18318 + spin_unlock(&sbinfo->si_plink_maint_lock);
18320 + wake_up_all(&sbinfo->si_plink_wq);
18323 +static int au_plink_maint_enter(struct file *file)
18326 + struct super_block *sb;
18327 + struct au_sbinfo *sbinfo;
18330 + sb = file->f_dentry->d_sb;
18331 + sbinfo = au_sbi(sb);
18332 + /* make sure i am the only one in this fs */
18333 + si_write_lock(sb);
18334 + /* spin_lock(&sbinfo->si_plink_maint_lock); */
18335 + if (!sbinfo->si_plink_maint)
18336 + sbinfo->si_plink_maint = file;
18339 + /* spin_unlock(&sbinfo->si_plink_maint_lock); */
18340 + si_write_unlock(sb);
18345 +/* ---------------------------------------------------------------------- */
18347 +struct pseudo_link {
18348 + struct list_head list;
18349 + struct inode *inode;
18352 +#ifdef CONFIG_AUFS_DEBUG
18353 +void au_plink_list(struct super_block *sb)
18355 + struct au_sbinfo *sbinfo;
18356 + struct list_head *plink_list;
18357 + struct pseudo_link *plink;
18359 + SiMustAnyLock(sb);
18361 + sbinfo = au_sbi(sb);
18362 + AuDebugOn(!au_opt_test(au_mntflags(sb), PLINK));
18364 + plink_list = &sbinfo->si_plink.head;
18365 + spin_lock(&sbinfo->si_plink.spin);
18366 + list_for_each_entry(plink, plink_list, list)
18367 + AuDbg("%lu\n", plink->inode->i_ino);
18368 + spin_unlock(&sbinfo->si_plink.spin);
18372 +/* is the inode pseudo-linked? */
18373 +int au_plink_test(struct inode *inode)
18376 + struct au_sbinfo *sbinfo;
18377 + struct list_head *plink_list;
18378 + struct pseudo_link *plink;
18380 + sbinfo = au_sbi(inode->i_sb);
18381 + AuRwMustAnyLock(&sbinfo->si_rwsem);
18382 + AuDebugOn(!au_opt_test(au_mntflags(inode->i_sb), PLINK));
18385 + plink_list = &sbinfo->si_plink.head;
18386 + spin_lock(&sbinfo->si_plink.spin);
18387 + list_for_each_entry(plink, plink_list, list)
18388 + if (plink->inode == inode) {
18392 + spin_unlock(&sbinfo->si_plink.spin);
18396 +/* ---------------------------------------------------------------------- */
18399 + * generate a name for plink.
18400 + * the file will be stored under AUFS_WH_PLINKDIR.
18402 +/* 20 is max digits length of ulong 64 */
18403 +#define PLINK_NAME_LEN ((20 + 1) * 2)
18405 +static int plink_name(char *name, int len, struct inode *inode,
18406 + aufs_bindex_t bindex)
18409 + struct inode *h_inode;
18411 + h_inode = au_h_iptr(inode, bindex);
18412 + rlen = snprintf(name, len, "%lu.%lu", inode->i_ino, h_inode->i_ino);
18416 +/* lookup the plink-ed @inode under the branch at @bindex */
18417 +struct dentry *au_plink_lkup(struct inode *inode, aufs_bindex_t bindex)
18419 + struct dentry *h_dentry, *h_parent;
18420 + struct au_branch *br;
18421 + struct inode *h_dir;
18422 + char a[PLINK_NAME_LEN];
18423 + struct qstr tgtname = {
18427 + br = au_sbr(inode->i_sb, bindex);
18428 + h_parent = br->br_wbr->wbr_plink;
18429 + h_dir = h_parent->d_inode;
18430 + tgtname.len = plink_name(a, sizeof(a), inode, bindex);
18432 + /* always superio. */
18433 + mutex_lock_nested(&h_dir->i_mutex, AuLsc_I_CHILD2);
18434 + h_dentry = au_sio_lkup_one(&tgtname, h_parent, br);
18435 + mutex_unlock(&h_dir->i_mutex);
18439 +/* create a pseudo-link */
18440 +static int do_whplink(struct qstr *tgt, struct dentry *h_parent,
18441 + struct dentry *h_dentry, struct au_branch *br)
18444 + struct path h_path = {
18445 + .mnt = br->br_mnt
18447 + struct inode *h_dir;
18449 + h_dir = h_parent->d_inode;
18451 + h_path.dentry = au_lkup_one(tgt, h_parent, br, /*nd*/NULL);
18452 + err = PTR_ERR(h_path.dentry);
18453 + if (IS_ERR(h_path.dentry))
18457 + /* wh.plink dir is not monitored */
18458 + if (h_path.dentry->d_inode
18459 + && h_path.dentry->d_inode != h_dentry->d_inode) {
18460 + err = vfsub_unlink(h_dir, &h_path, /*force*/0);
18461 + dput(h_path.dentry);
18462 + h_path.dentry = NULL;
18466 + if (!err && !h_path.dentry->d_inode)
18467 + err = vfsub_link(h_dentry, h_dir, &h_path);
18468 + dput(h_path.dentry);
18474 +struct do_whplink_args {
18476 + struct qstr *tgt;
18477 + struct dentry *h_parent;
18478 + struct dentry *h_dentry;
18479 + struct au_branch *br;
18482 +static void call_do_whplink(void *args)
18484 + struct do_whplink_args *a = args;
18485 + *a->errp = do_whplink(a->tgt, a->h_parent, a->h_dentry, a->br);
18488 +static int whplink(struct dentry *h_dentry, struct inode *inode,
18489 + aufs_bindex_t bindex, struct au_branch *br)
18491 + int err, wkq_err;
18492 + struct au_wbr *wbr;
18493 + struct dentry *h_parent;
18494 + struct inode *h_dir;
18495 + char a[PLINK_NAME_LEN];
18496 + struct qstr tgtname = {
18500 + wbr = au_sbr(inode->i_sb, bindex)->br_wbr;
18501 + h_parent = wbr->wbr_plink;
18502 + h_dir = h_parent->d_inode;
18503 + tgtname.len = plink_name(a, sizeof(a), inode, bindex);
18505 + /* always superio. */
18506 + mutex_lock_nested(&h_dir->i_mutex, AuLsc_I_CHILD2);
18507 + if (!au_test_wkq(current)) {
18508 + struct do_whplink_args args = {
18511 + .h_parent = h_parent,
18512 + .h_dentry = h_dentry,
18515 + wkq_err = au_wkq_wait(call_do_whplink, &args);
18516 + if (unlikely(wkq_err))
18519 + err = do_whplink(&tgtname, h_parent, h_dentry, br);
18520 + mutex_unlock(&h_dir->i_mutex);
18525 +/* free a single plink */
18526 +static void do_put_plink(struct pseudo_link *plink, int do_del)
18528 + iput(plink->inode);
18530 + list_del(&plink->list);
18535 + * create a new pseudo-link for @h_dentry on @bindex.
18536 + * the linked inode is held in aufs @inode.
18538 +void au_plink_append(struct inode *inode, aufs_bindex_t bindex,
18539 + struct dentry *h_dentry)
18541 + struct super_block *sb;
18542 + struct au_sbinfo *sbinfo;
18543 + struct list_head *plink_list;
18544 + struct pseudo_link *plink;
18545 + int found, err, cnt;
18547 + sb = inode->i_sb;
18548 + sbinfo = au_sbi(sb);
18549 + AuDebugOn(!au_opt_test(au_mntflags(sb), PLINK));
18554 + plink_list = &sbinfo->si_plink.head;
18555 + spin_lock(&sbinfo->si_plink.spin);
18556 + list_for_each_entry(plink, plink_list, list) {
18558 + if (plink->inode == inode) {
18564 + spin_unlock(&sbinfo->si_plink.spin);
18570 + plink = kmalloc(sizeof(*plink), GFP_ATOMIC);
18572 + plink->inode = au_igrab(inode);
18573 + list_add(&plink->list, plink_list);
18578 + spin_unlock(&sbinfo->si_plink.spin);
18581 + au_plink_maint_block(sb);
18582 + err = whplink(h_dentry, inode, bindex, au_sbr(sb, bindex));
18585 + if (unlikely(cnt > AUFS_PLINK_WARN))
18586 + AuWarn1("unexpectedly many pseudo links, %d\n", cnt);
18587 + if (unlikely(err)) {
18588 + AuWarn("err %d, damaged pseudo link.\n", err);
18589 + if (!found && plink)
18590 + do_put_plink(plink, /*do_del*/1);
18594 +/* free all plinks */
18595 +void au_plink_put(struct super_block *sb)
18597 + struct au_sbinfo *sbinfo;
18598 + struct list_head *plink_list;
18599 + struct pseudo_link *plink, *tmp;
18601 + SiMustWriteLock(sb);
18603 + sbinfo = au_sbi(sb);
18604 + AuDebugOn(!au_opt_test(au_mntflags(sb), PLINK));
18606 + plink_list = &sbinfo->si_plink.head;
18607 + /* no spin_lock since sbinfo is write-locked */
18608 + list_for_each_entry_safe(plink, tmp, plink_list, list)
18609 + do_put_plink(plink, 0);
18610 + INIT_LIST_HEAD(plink_list);
18613 +/* free the plinks on a branch specified by @br_id */
18614 +void au_plink_half_refresh(struct super_block *sb, aufs_bindex_t br_id)
18616 + struct au_sbinfo *sbinfo;
18617 + struct list_head *plink_list;
18618 + struct pseudo_link *plink, *tmp;
18619 + struct inode *inode;
18620 + aufs_bindex_t bstart, bend, bindex;
18621 + unsigned char do_put;
18623 + SiMustWriteLock(sb);
18625 + sbinfo = au_sbi(sb);
18626 + AuDebugOn(!au_opt_test(au_mntflags(sb), PLINK));
18628 + plink_list = &sbinfo->si_plink.head;
18629 + /* no spin_lock since sbinfo is write-locked */
18630 + list_for_each_entry_safe(plink, tmp, plink_list, list) {
18632 + inode = au_igrab(plink->inode);
18633 + ii_write_lock_child(inode);
18634 + bstart = au_ibstart(inode);
18635 + bend = au_ibend(inode);
18636 + if (bstart >= 0) {
18637 + for (bindex = bstart; bindex <= bend; bindex++) {
18638 + if (!au_h_iptr(inode, bindex)
18639 + || au_ii_br_id(inode, bindex) != br_id)
18641 + au_set_h_iptr(inode, bindex, NULL, 0);
18646 + do_put_plink(plink, 1);
18649 + for (bindex = bstart; bindex <= bend; bindex++)
18650 + if (au_h_iptr(inode, bindex)) {
18655 + do_put_plink(plink, 1);
18657 + ii_write_unlock(inode);
18662 +/* ---------------------------------------------------------------------- */
18664 +long au_plink_ioctl(struct file *file, unsigned int cmd)
18667 + struct super_block *sb;
18668 + struct au_sbinfo *sbinfo;
18671 + if (!capable(CAP_SYS_ADMIN))
18675 + sb = file->f_dentry->d_sb;
18676 + sbinfo = au_sbi(sb);
18678 + case AUFS_CTL_PLINK_MAINT:
18680 + * pseudo-link maintenance mode,
18681 + * cleared by aufs_release_dir()
18683 + err = au_plink_maint_enter(file);
18685 + case AUFS_CTL_PLINK_CLEAN:
18686 + aufs_write_lock(sb->s_root);
18687 + if (au_opt_test(sbinfo->si_mntflags, PLINK))
18688 + au_plink_put(sb);
18689 + aufs_write_unlock(sb->s_root);
18697 diff --git a/fs/aufs/rdu.c b/fs/aufs/rdu.c
18698 new file mode 100644
18699 index 0000000..c38f280
18701 +++ b/fs/aufs/rdu.c
18704 + * Copyright (C) 2005-2009 Junjiro R. Okajima
18706 + * This program, aufs is free software; you can redistribute it and/or modify
18707 + * it under the terms of the GNU General Public License as published by
18708 + * the Free Software Foundation; either version 2 of the License, or
18709 + * (at your option) any later version.
18711 + * This program is distributed in the hope that it will be useful,
18712 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
18713 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18714 + * GNU General Public License for more details.
18716 + * You should have received a copy of the GNU General Public License
18717 + * along with this program; if not, write to the Free Software
18718 + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
18722 + * readdir in userspace.
18725 +#include <linux/security.h>
18726 +#include <linux/uaccess.h>
18727 +#include <linux/aufs_type.h>
18730 +/* bits for struct aufs_rdu.flags */
18731 +#define AuRdu_CALLED 1
18732 +#define AuRdu_CONT (1 << 1)
18733 +#define AuRdu_FULL (1 << 2)
18734 +#define au_ftest_rdu(flags, name) ((flags) & AuRdu_##name)
18735 +#define au_fset_rdu(flags, name) { (flags) |= AuRdu_##name; }
18736 +#define au_fclr_rdu(flags, name) { (flags) &= ~AuRdu_##name; }
18738 +struct au_rdu_arg {
18739 + struct aufs_rdu *rdu;
18740 + union au_rdu_ent_ul ent;
18741 + unsigned long end;
18743 + struct super_block *sb;
18747 +static int au_rdu_fill(void *__arg, const char *name, int nlen,
18748 + loff_t offset, u64 h_ino, unsigned int d_type)
18751 + struct au_rdu_arg *arg = __arg;
18752 + struct aufs_rdu *rdu = arg->rdu;
18753 + struct au_rdu_ent ent;
18757 + au_fset_rdu(rdu->cookie.flags, CALLED);
18758 + len = au_rdu_len(nlen);
18759 + if (arg->ent.ul + len < arg->end) {
18761 + ent.bindex = rdu->cookie.bindex;
18762 + ent.type = d_type;
18764 + if (unlikely(nlen > AUFS_MAX_NAMELEN))
18765 + ent.type = DT_UNKNOWN;
18768 + if (copy_to_user(arg->ent.e, &ent, sizeof(ent)))
18770 + if (copy_to_user(arg->ent.e->name, name, nlen))
18772 + /* the terminating NULL */
18773 + if (__put_user(0, arg->ent.e->name + nlen))
18776 + /* AuDbg("%p, %.*s\n", arg->ent.p, nlen, name); */
18777 + arg->ent.ul += len;
18781 + au_fset_rdu(rdu->cookie.flags, FULL);
18783 + rdu->tail = arg->ent;
18787 + /* AuTraceErr(err); */
18791 +static int au_rdu_do(struct file *h_file, struct au_rdu_arg *arg)
18795 + struct au_rdu_cookie *cookie = &arg->rdu->cookie;
18797 + offset = vfsub_llseek(h_file, cookie->h_pos, SEEK_SET);
18799 + if (unlikely(offset != cookie->h_pos))
18805 + au_fclr_rdu(cookie->flags, CALLED);
18807 + err = vfsub_readdir(h_file, au_rdu_fill, arg);
18811 + && au_ftest_rdu(cookie->flags, CALLED)
18812 + && !au_ftest_rdu(cookie->flags, FULL));
18813 + cookie->h_pos = h_file->f_pos;
18820 +static int au_rdu(struct file *file, struct aufs_rdu *rdu)
18823 + aufs_bindex_t bend;
18824 + struct au_rdu_arg arg;
18825 + struct dentry *dentry;
18826 + struct inode *inode;
18827 + struct file *h_file;
18828 + struct au_rdu_cookie *cookie = &rdu->cookie;
18830 + err = !access_ok(VERIFY_WRITE, rdu->ent.e, rdu->sz);
18831 + if (unlikely(err)) {
18837 + rdu->tail = rdu->ent;
18840 + arg.ent = rdu->ent;
18841 + arg.end = arg.ent.ul;
18842 + arg.end += rdu->sz;
18845 + if (unlikely(!file->f_op || !file->f_op->readdir))
18848 + err = security_file_permission(file, MAY_READ);
18850 + if (unlikely(err))
18853 + dentry = file->f_dentry;
18854 + inode = dentry->d_inode;
18856 + mutex_lock(&inode->i_mutex);
18858 + err = mutex_lock_killable(&inode->i_mutex);
18860 + if (unlikely(err))
18864 + if (unlikely(IS_DEADDIR(inode)))
18867 + arg.sb = inode->i_sb;
18868 + si_read_lock(arg.sb, AuLock_FLUSH);
18869 + fi_read_lock(file);
18872 + if (unlikely(au_ftest_rdu(cookie->flags, CONT)
18873 + && cookie->generation != au_figen(file)))
18878 + rdu->blk = au_sbi(arg.sb)->si_rdblk;
18880 + rdu->blk = au_dir_size(file, /*dentry*/NULL);
18882 + bend = au_fbstart(file);
18883 + if (cookie->bindex < bend)
18884 + cookie->bindex = bend;
18885 + bend = au_fbend(file);
18886 + /* AuDbg("b%d, b%d\n", cookie->bindex, bend); */
18887 + for (; !err && cookie->bindex <= bend;
18888 + cookie->bindex++, cookie->h_pos = 0) {
18889 + h_file = au_h_fptr(file, cookie->bindex);
18893 + au_fclr_rdu(cookie->flags, FULL);
18894 + err = au_rdu_do(h_file, &arg);
18896 + if (unlikely(au_ftest_rdu(cookie->flags, FULL) || err))
18899 + AuDbg("rent %llu\n", rdu->rent);
18901 + if (!err && !au_ftest_rdu(cookie->flags, CONT)) {
18902 + rdu->shwh = !!au_opt_test(au_sbi(arg.sb)->si_mntflags, SHWH);
18903 + au_fset_rdu(cookie->flags, CONT);
18904 + cookie->generation = au_figen(file);
18907 + ii_read_lock_child(inode);
18908 + fsstack_copy_attr_atime(inode, au_h_iptr(inode, au_ibstart(inode)));
18909 + ii_read_unlock(inode);
18912 + fi_read_unlock(file);
18913 + si_read_unlock(arg.sb);
18915 + mutex_unlock(&inode->i_mutex);
18921 +static int au_rdu_ino(struct file *file, struct aufs_rdu *rdu)
18925 + unsigned long long nent;
18926 + union au_rdu_ent_ul *u;
18927 + struct au_rdu_ent ent;
18928 + struct super_block *sb;
18931 + nent = rdu->nent;
18933 + sb = file->f_dentry->d_sb;
18934 + si_read_lock(sb, AuLock_FLUSH);
18935 + while (nent-- > 0) {
18936 + err = !access_ok(VERIFY_WRITE, u->e, sizeof(ent));
18937 + if (unlikely(err)) {
18943 + err = copy_from_user(&ent, u->e, sizeof(ent));
18944 + if (unlikely(err)) {
18950 + /* AuDbg("b%d, i%llu\n", ent.bindex, ent.ino); */
18952 + err = au_ino(sb, ent.bindex, ent.ino, ent.type, &ino);
18954 + err = au_wh_ino(sb, ent.bindex, ent.ino, ent.type,
18956 + if (unlikely(err)) {
18961 + err = __put_user(ino, &u->e->ino);
18962 + if (unlikely(err)) {
18967 + u->ul += au_rdu_len(ent.nlen);
18969 + si_read_unlock(sb);
18974 +/* ---------------------------------------------------------------------- */
18976 +static int au_rdu_verify(struct aufs_rdu *rdu)
18978 + AuDbg("rdu{%llu, %p, (%u, %u) | %u | %llu, %u, %u | "
18979 + "%llu, b%d, 0x%x, g%u}\n",
18980 + rdu->sz, rdu->ent.e, rdu->verify[0], rdu->verify[1],
18982 + rdu->rent, rdu->shwh, rdu->full,
18983 + rdu->cookie.h_pos, rdu->cookie.bindex, rdu->cookie.flags,
18984 + rdu->cookie.generation);
18986 + if (rdu->verify[AufsCtlRduV_SZ] == sizeof(*rdu)
18987 + && rdu->verify[AufsCtlRduV_SZ_PTR] == sizeof(rdu))
18990 + AuDbg("%u:%u, %u:%u\n",
18991 + rdu->verify[AufsCtlRduV_SZ], (unsigned int)sizeof(*rdu),
18992 + rdu->verify[AufsCtlRduV_SZ_PTR], (unsigned int)sizeof(rdu));
18996 +long au_rdu_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
18999 + struct aufs_rdu rdu;
19000 + void __user *p = (void __user *)arg;
19002 + err = copy_from_user(&rdu, p, sizeof(rdu));
19003 + if (unlikely(err)) {
19008 + err = au_rdu_verify(&rdu);
19009 + if (unlikely(err))
19013 + case AUFS_CTL_RDU:
19014 + err = au_rdu(file, &rdu);
19015 + if (unlikely(err))
19018 + e = copy_to_user(p, &rdu, sizeof(rdu));
19019 + if (unlikely(e)) {
19024 + case AUFS_CTL_RDU_INO:
19025 + err = au_rdu_ino(file, &rdu);
19036 diff --git a/fs/aufs/rwsem.h b/fs/aufs/rwsem.h
19037 new file mode 100644
19038 index 0000000..dfd2c68
19040 +++ b/fs/aufs/rwsem.h
19043 + * Copyright (C) 2005-2009 Junjiro R. Okajima
19045 + * This program, aufs is free software; you can redistribute it and/or modify
19046 + * it under the terms of the GNU General Public License as published by
19047 + * the Free Software Foundation; either version 2 of the License, or
19048 + * (at your option) any later version.
19050 + * This program is distributed in the hope that it will be useful,
19051 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
19052 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19053 + * GNU General Public License for more details.
19055 + * You should have received a copy of the GNU General Public License
19056 + * along with this program; if not, write to the Free Software
19057 + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
19061 + * simple read-write semaphore wrappers
19064 +#ifndef __AUFS_RWSEM_H__
19065 +#define __AUFS_RWSEM_H__
19069 +#include <linux/rwsem.h>
19072 + struct rw_semaphore rwsem;
19073 +#ifdef CONFIG_AUFS_DEBUG
19074 + /* just for debugging, not almighty counter */
19075 + atomic_t rcnt, wcnt;
19079 +#ifdef CONFIG_AUFS_DEBUG
19080 +#define AuDbgCntInit(rw) do { \
19081 + atomic_set(&(rw)->rcnt, 0); \
19082 + atomic_set(&(rw)->wcnt, 0); \
19083 + smp_mb(); /* atomic set */ \
19086 +#define AuDbgRcntInc(rw) atomic_inc_return(&(rw)->rcnt)
19087 +#define AuDbgRcntDec(rw) WARN_ON(atomic_dec_return(&(rw)->rcnt) < 0)
19088 +#define AuDbgWcntInc(rw) WARN_ON(atomic_inc_return(&(rw)->wcnt) > 1)
19089 +#define AuDbgWcntDec(rw) WARN_ON(atomic_dec_return(&(rw)->wcnt) < 0)
19091 +#define AuDbgCntInit(rw) do {} while (0)
19092 +#define AuDbgRcntInc(rw) do {} while (0)
19093 +#define AuDbgRcntDec(rw) do {} while (0)
19094 +#define AuDbgWcntInc(rw) do {} while (0)
19095 +#define AuDbgWcntDec(rw) do {} while (0)
19096 +#endif /* CONFIG_AUFS_DEBUG */
19098 +/* to debug easier, do not make them inlined functions */
19099 +#define AuRwMustNoWaiters(rw) AuDebugOn(!list_empty(&(rw)->rwsem.wait_list))
19100 +/* rwsem_is_locked() is unusable */
19101 +#define AuRwMustReadLock(rw) AuDebugOn(atomic_read(&(rw)->rcnt) <= 0)
19102 +#define AuRwMustWriteLock(rw) AuDebugOn(atomic_read(&(rw)->wcnt) <= 0)
19103 +#define AuRwMustAnyLock(rw) AuDebugOn(atomic_read(&(rw)->rcnt) <= 0 \
19104 + && atomic_read(&(rw)->wcnt) <= 0)
19105 +#define AuRwDestroy(rw) AuDebugOn(atomic_read(&(rw)->rcnt) \
19106 + || atomic_read(&(rw)->wcnt))
19108 +static inline void au_rw_init(struct au_rwsem *rw)
19110 + AuDbgCntInit(rw);
19111 + init_rwsem(&rw->rwsem);
19114 +static inline void au_rw_init_wlock(struct au_rwsem *rw)
19117 + down_write(&rw->rwsem);
19118 + AuDbgWcntInc(rw);
19121 +static inline void au_rw_init_wlock_nested(struct au_rwsem *rw,
19122 + unsigned int lsc)
19125 + down_write_nested(&rw->rwsem, lsc);
19126 + AuDbgWcntInc(rw);
19129 +static inline void au_rw_read_lock(struct au_rwsem *rw)
19131 + down_read(&rw->rwsem);
19132 + AuDbgRcntInc(rw);
19135 +static inline void au_rw_read_lock_nested(struct au_rwsem *rw, unsigned int lsc)
19137 + down_read_nested(&rw->rwsem, lsc);
19138 + AuDbgRcntInc(rw);
19141 +static inline void au_rw_read_unlock(struct au_rwsem *rw)
19143 + AuRwMustReadLock(rw);
19144 + AuDbgRcntDec(rw);
19145 + up_read(&rw->rwsem);
19148 +static inline void au_rw_dgrade_lock(struct au_rwsem *rw)
19150 + AuRwMustWriteLock(rw);
19151 + AuDbgRcntInc(rw);
19152 + AuDbgWcntDec(rw);
19153 + downgrade_write(&rw->rwsem);
19156 +static inline void au_rw_write_lock(struct au_rwsem *rw)
19158 + down_write(&rw->rwsem);
19159 + AuDbgWcntInc(rw);
19162 +static inline void au_rw_write_lock_nested(struct au_rwsem *rw,
19163 + unsigned int lsc)
19165 + down_write_nested(&rw->rwsem, lsc);
19166 + AuDbgWcntInc(rw);
19169 +static inline void au_rw_write_unlock(struct au_rwsem *rw)
19171 + AuRwMustWriteLock(rw);
19172 + AuDbgWcntDec(rw);
19173 + up_write(&rw->rwsem);
19176 +/* why is not _nested version defined */
19177 +static inline int au_rw_read_trylock(struct au_rwsem *rw)
19179 + int ret = down_read_trylock(&rw->rwsem);
19181 + AuDbgRcntInc(rw);
19185 +static inline int au_rw_write_trylock(struct au_rwsem *rw)
19187 + int ret = down_write_trylock(&rw->rwsem);
19189 + AuDbgWcntInc(rw);
19193 +#undef AuDbgCntInit
19194 +#undef AuDbgRcntInc
19195 +#undef AuDbgRcntDec
19196 +#undef AuDbgWcntInc
19197 +#undef AuDbgWcntDec
19199 +#define AuSimpleLockRwsemFuncs(prefix, param, rwsem) \
19200 +static inline void prefix##_read_lock(param) \
19201 +{ au_rw_read_lock(rwsem); } \
19202 +static inline void prefix##_write_lock(param) \
19203 +{ au_rw_write_lock(rwsem); } \
19204 +static inline int prefix##_read_trylock(param) \
19205 +{ return au_rw_read_trylock(rwsem); } \
19206 +static inline int prefix##_write_trylock(param) \
19207 +{ return au_rw_write_trylock(rwsem); }
19208 +/* why is not _nested version defined */
19209 +/* static inline void prefix##_read_trylock_nested(param, lsc)
19210 +{ au_rw_read_trylock_nested(rwsem, lsc)); }
19211 +static inline void prefix##_write_trylock_nestd(param, lsc)
19212 +{ au_rw_write_trylock_nested(rwsem, lsc); } */
19214 +#define AuSimpleUnlockRwsemFuncs(prefix, param, rwsem) \
19215 +static inline void prefix##_read_unlock(param) \
19216 +{ au_rw_read_unlock(rwsem); } \
19217 +static inline void prefix##_write_unlock(param) \
19218 +{ au_rw_write_unlock(rwsem); } \
19219 +static inline void prefix##_downgrade_lock(param) \
19220 +{ au_rw_dgrade_lock(rwsem); }
19222 +#define AuSimpleRwsemFuncs(prefix, param, rwsem) \
19223 + AuSimpleLockRwsemFuncs(prefix, param, rwsem) \
19224 + AuSimpleUnlockRwsemFuncs(prefix, param, rwsem)
19226 +#endif /* __KERNEL__ */
19227 +#endif /* __AUFS_RWSEM_H__ */
19228 diff --git a/fs/aufs/sbinfo.c b/fs/aufs/sbinfo.c
19229 new file mode 100644
19230 index 0000000..8a797a7
19232 +++ b/fs/aufs/sbinfo.c
19235 + * Copyright (C) 2005-2009 Junjiro R. Okajima
19237 + * This program, aufs is free software; you can redistribute it and/or modify
19238 + * it under the terms of the GNU General Public License as published by
19239 + * the Free Software Foundation; either version 2 of the License, or
19240 + * (at your option) any later version.
19242 + * This program is distributed in the hope that it will be useful,
19243 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
19244 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19245 + * GNU General Public License for more details.
19247 + * You should have received a copy of the GNU General Public License
19248 + * along with this program; if not, write to the Free Software
19249 + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
19253 + * superblock private data
19259 + * they are necessary regardless sysfs is disabled.
19261 +void au_si_free(struct kobject *kobj)
19263 + struct au_sbinfo *sbinfo;
19264 + struct super_block *sb;
19266 + sbinfo = container_of(kobj, struct au_sbinfo, si_kobj);
19267 + AuDebugOn(!list_empty(&sbinfo->si_plink.head));
19268 + AuDebugOn(sbinfo->si_plink_maint);
19270 + sb = sbinfo->si_sb;
19271 + si_write_lock(sb);
19273 + au_br_free(sbinfo);
19274 + kfree(sbinfo->si_branch);
19275 + mutex_destroy(&sbinfo->si_xib_mtx);
19276 + si_write_unlock(sb);
19277 + AuRwDestroy(&sbinfo->si_rwsem);
19282 +int au_si_alloc(struct super_block *sb)
19285 + struct au_sbinfo *sbinfo;
19288 + sbinfo = kmalloc(sizeof(*sbinfo), GFP_NOFS);
19289 + if (unlikely(!sbinfo))
19292 + /* will be reallocated separately */
19293 + sbinfo->si_branch = kzalloc(sizeof(*sbinfo->si_branch), GFP_NOFS);
19294 + if (unlikely(!sbinfo->si_branch))
19297 + memset(&sbinfo->si_kobj, 0, sizeof(sbinfo->si_kobj));
19298 + err = sysaufs_si_init(sbinfo);
19299 + if (unlikely(err))
19302 + au_nwt_init(&sbinfo->si_nowait);
19303 + au_rw_init_wlock(&sbinfo->si_rwsem);
19304 + sbinfo->si_generation = 0;
19305 + sbinfo->au_si_status = 0;
19306 + sbinfo->si_bend = -1;
19307 + sbinfo->si_last_br_id = 0;
19309 + sbinfo->si_wbr_copyup = AuWbrCopyup_Def;
19310 + sbinfo->si_wbr_create = AuWbrCreate_Def;
19311 + sbinfo->si_wbr_copyup_ops = au_wbr_copyup_ops + AuWbrCopyup_Def;
19312 + sbinfo->si_wbr_create_ops = au_wbr_create_ops + AuWbrCreate_Def;
19314 + sbinfo->si_mntflags = AuOpt_Def;
19316 + sbinfo->si_xread = NULL;
19317 + sbinfo->si_xwrite = NULL;
19318 + sbinfo->si_xib = NULL;
19319 + mutex_init(&sbinfo->si_xib_mtx);
19320 + sbinfo->si_xib_buf = NULL;
19321 + sbinfo->si_xino_brid = -1;
19322 + /* leave si_xib_last_pindex and si_xib_next_bit */
19324 + sbinfo->si_rdcache = AUFS_RDCACHE_DEF * HZ;
19325 + sbinfo->si_rdblk = AUFS_RDBLK_DEF;
19326 + sbinfo->si_rdhash = AUFS_RDHASH_DEF;
19327 + sbinfo->si_dirwh = AUFS_DIRWH_DEF;
19329 + au_spl_init(&sbinfo->si_plink);
19330 + init_waitqueue_head(&sbinfo->si_plink_wq);
19331 + spin_lock_init(&sbinfo->si_plink_maint_lock);
19332 + sbinfo->si_plink_maint = NULL;
19334 + /* leave other members for sysaufs and si_mnt. */
19335 + sbinfo->si_sb = sb;
19336 + sb->s_fs_info = sbinfo;
19337 + au_debug_sbinfo_init(sbinfo);
19338 + return 0; /* success */
19341 + kfree(sbinfo->si_branch);
19348 +int au_sbr_realloc(struct au_sbinfo *sbinfo, int nbr)
19351 + struct au_branch **brp;
19353 + AuRwMustWriteLock(&sbinfo->si_rwsem);
19356 + sz = sizeof(*brp) * (sbinfo->si_bend + 1);
19357 + if (unlikely(!sz))
19358 + sz = sizeof(*brp);
19359 + brp = au_kzrealloc(sbinfo->si_branch, sz, sizeof(*brp) * nbr, GFP_NOFS);
19361 + sbinfo->si_branch = brp;
19368 +/* ---------------------------------------------------------------------- */
19370 +unsigned int au_sigen_inc(struct super_block *sb)
19372 + unsigned int gen;
19374 + SiMustWriteLock(sb);
19376 + gen = ++au_sbi(sb)->si_generation;
19377 + au_update_digen(sb->s_root);
19378 + au_update_iigen(sb->s_root->d_inode);
19379 + sb->s_root->d_inode->i_version++;
19383 +aufs_bindex_t au_new_br_id(struct super_block *sb)
19385 + aufs_bindex_t br_id;
19387 + struct au_sbinfo *sbinfo;
19389 + SiMustWriteLock(sb);
19391 + sbinfo = au_sbi(sb);
19392 + for (i = 0; i <= AUFS_BRANCH_MAX; i++) {
19393 + br_id = ++sbinfo->si_last_br_id;
19394 + if (br_id && au_br_index(sb, br_id) < 0)
19401 +/* ---------------------------------------------------------------------- */
19403 +/* dentry and super_block lock. call at entry point */
19404 +void aufs_read_lock(struct dentry *dentry, int flags)
19406 + si_read_lock(dentry->d_sb, flags);
19407 + if (au_ftest_lock(flags, DW))
19408 + di_write_lock_child(dentry);
19410 + di_read_lock_child(dentry, flags);
19413 +void aufs_read_unlock(struct dentry *dentry, int flags)
19415 + if (au_ftest_lock(flags, DW))
19416 + di_write_unlock(dentry);
19418 + di_read_unlock(dentry, flags);
19419 + si_read_unlock(dentry->d_sb);
19422 +void aufs_write_lock(struct dentry *dentry)
19424 + si_write_lock(dentry->d_sb);
19425 + di_write_lock_child(dentry);
19428 +void aufs_write_unlock(struct dentry *dentry)
19430 + di_write_unlock(dentry);
19431 + si_write_unlock(dentry->d_sb);
19434 +void aufs_read_and_write_lock2(struct dentry *d1, struct dentry *d2, int flags)
19436 + si_read_lock(d1->d_sb, flags);
19437 + di_write_lock2_child(d1, d2, au_ftest_lock(flags, DIR));
19440 +void aufs_read_and_write_unlock2(struct dentry *d1, struct dentry *d2)
19442 + di_write_unlock2(d1, d2);
19443 + si_read_unlock(d1->d_sb);
19445 diff --git a/fs/aufs/spl.h b/fs/aufs/spl.h
19446 new file mode 100644
19447 index 0000000..bcbbd9a
19449 +++ b/fs/aufs/spl.h
19452 + * Copyright (C) 2005-2009 Junjiro R. Okajima
19454 + * This program, aufs is free software; you can redistribute it and/or modify
19455 + * it under the terms of the GNU General Public License as published by
19456 + * the Free Software Foundation; either version 2 of the License, or
19457 + * (at your option) any later version.
19459 + * This program is distributed in the hope that it will be useful,
19460 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
19461 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19462 + * GNU General Public License for more details.
19464 + * You should have received a copy of the GNU General Public License
19465 + * along with this program; if not, write to the Free Software
19466 + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
19470 + * simple list protected by a spinlock
19473 +#ifndef __AUFS_SPL_H__
19474 +#define __AUFS_SPL_H__
19478 +#include <linux/spinlock.h>
19479 +#include <linux/list.h>
19481 +struct au_splhead {
19483 + struct list_head head;
19486 +static inline void au_spl_init(struct au_splhead *spl)
19488 + spin_lock_init(&spl->spin);
19489 + INIT_LIST_HEAD(&spl->head);
19492 +static inline void au_spl_add(struct list_head *list, struct au_splhead *spl)
19494 + spin_lock(&spl->spin);
19495 + list_add(list, &spl->head);
19496 + spin_unlock(&spl->spin);
19499 +static inline void au_spl_del(struct list_head *list, struct au_splhead *spl)
19501 + spin_lock(&spl->spin);
19503 + spin_unlock(&spl->spin);
19506 +#endif /* __KERNEL__ */
19507 +#endif /* __AUFS_SPL_H__ */
19508 diff --git a/fs/aufs/super.c b/fs/aufs/super.c
19509 new file mode 100644
19510 index 0000000..e006e84
19512 +++ b/fs/aufs/super.c
19515 + * Copyright (C) 2005-2009 Junjiro R. Okajima
19517 + * This program, aufs is free software; you can redistribute it and/or modify
19518 + * it under the terms of the GNU General Public License as published by
19519 + * the Free Software Foundation; either version 2 of the License, or
19520 + * (at your option) any later version.
19522 + * This program is distributed in the hope that it will be useful,
19523 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
19524 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19525 + * GNU General Public License for more details.
19527 + * You should have received a copy of the GNU General Public License
19528 + * along with this program; if not, write to the Free Software
19529 + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
19533 + * mount and super_block operations
19536 +#include <linux/buffer_head.h>
19537 +#include <linux/module.h>
19538 +#include <linux/seq_file.h>
19539 +#include <linux/statfs.h>
19543 + * super_operations
19545 +static struct inode *aufs_alloc_inode(struct super_block *sb __maybe_unused)
19547 + struct au_icntnr *c;
19549 + c = au_cache_alloc_icntnr();
19551 + inode_init_once(&c->vfs_inode);
19552 + c->vfs_inode.i_version = 1; /* sigen(sb); */
19553 + c->iinfo.ii_hinode = NULL;
19554 + return &c->vfs_inode;
19559 +static void aufs_destroy_inode(struct inode *inode)
19561 + au_iinfo_fin(inode);
19562 + au_cache_free_icntnr(container_of(inode, struct au_icntnr, vfs_inode));
19565 +struct inode *au_iget_locked(struct super_block *sb, ino_t ino)
19567 + struct inode *inode;
19570 + inode = iget_locked(sb, ino);
19571 + if (unlikely(!inode)) {
19572 + inode = ERR_PTR(-ENOMEM);
19575 + if (!(inode->i_state & I_NEW))
19578 + err = au_xigen_new(inode);
19580 + err = au_iinfo_init(inode);
19582 + inode->i_version++;
19584 + iget_failed(inode);
19585 + inode = ERR_PTR(err);
19589 + /* never return NULL */
19590 + AuDebugOn(!inode);
19591 + AuTraceErrPtr(inode);
19595 +/* lock free root dinfo */
19596 +static int au_show_brs(struct seq_file *seq, struct super_block *sb)
19599 + aufs_bindex_t bindex, bend;
19600 + struct path path;
19601 + struct au_hdentry *hd;
19602 + struct au_branch *br;
19605 + bend = au_sbend(sb);
19606 + hd = au_di(sb->s_root)->di_hdentry;
19607 + for (bindex = 0; !err && bindex <= bend; bindex++) {
19608 + br = au_sbr(sb, bindex);
19609 + path.mnt = br->br_mnt;
19610 + path.dentry = hd[bindex].hd_dentry;
19611 + err = au_seq_path(seq, &path);
19613 + err = seq_printf(seq, "=%s",
19614 + au_optstr_br_perm(br->br_perm));
19615 + if (!err && bindex != bend)
19616 + err = seq_putc(seq, ':');
19622 +static void au_show_wbr_create(struct seq_file *m, int v,
19623 + struct au_sbinfo *sbinfo)
19627 + AuRwMustAnyLock(&sbinfo->si_rwsem);
19629 + seq_printf(m, ",create=");
19630 + pat = au_optstr_wbr_create(v);
19632 + case AuWbrCreate_TDP:
19633 + case AuWbrCreate_RR:
19634 + case AuWbrCreate_MFS:
19635 + case AuWbrCreate_PMFS:
19636 + seq_printf(m, pat);
19638 + case AuWbrCreate_MFSV:
19639 + seq_printf(m, /*pat*/"mfs:%lu",
19640 + sbinfo->si_wbr_mfs.mfs_expire / HZ);
19642 + case AuWbrCreate_PMFSV:
19643 + seq_printf(m, /*pat*/"pmfs:%lu",
19644 + sbinfo->si_wbr_mfs.mfs_expire / HZ);
19646 + case AuWbrCreate_MFSRR:
19647 + seq_printf(m, /*pat*/"mfsrr:%llu",
19648 + sbinfo->si_wbr_mfs.mfsrr_watermark);
19650 + case AuWbrCreate_MFSRRV:
19651 + seq_printf(m, /*pat*/"mfsrr:%llu:%lu",
19652 + sbinfo->si_wbr_mfs.mfsrr_watermark,
19653 + sbinfo->si_wbr_mfs.mfs_expire / HZ);
19658 +static int au_show_xino(struct seq_file *seq, struct vfsmount *mnt)
19660 +#ifdef CONFIG_SYSFS
19664 + const int len = sizeof(AUFS_XINO_FNAME) - 1;
19665 + aufs_bindex_t bindex, brid;
19666 + struct super_block *sb;
19667 + struct qstr *name;
19669 + struct dentry *d, *h_root;
19671 + AuRwMustAnyLock(&sbinfo->si_rwsem);
19674 + sb = mnt->mnt_sb;
19675 + f = au_sbi(sb)->si_xib;
19679 + /* stop printing the default xino path on the first writable branch */
19681 + brid = au_xino_brid(sb);
19683 + bindex = au_br_index(sb, brid);
19684 + h_root = au_di(sb->s_root)->di_hdentry[0 + bindex].hd_dentry;
19687 + name = &d->d_name;
19688 + /* safe ->d_parent because the file is unlinked */
19689 + if (d->d_parent == h_root
19690 + && name->len == len
19691 + && !memcmp(name->name, AUFS_XINO_FNAME, len))
19694 + seq_puts(seq, ",xino=");
19695 + err = au_xino_path(seq, f);
19702 +/* seq_file will re-call me in case of too long string */
19703 +static int aufs_show_options(struct seq_file *m, struct vfsmount *mnt)
19706 + unsigned int mnt_flags, v;
19707 + struct super_block *sb;
19708 + struct au_sbinfo *sbinfo;
19710 +#define AuBool(name, str) do { \
19711 + v = au_opt_test(mnt_flags, name); \
19712 + if (v != au_opt_test(AuOpt_Def, name)) \
19713 + seq_printf(m, ",%s" #str, v ? "" : "no"); \
19716 +#define AuStr(name, str) do { \
19717 + v = mnt_flags & AuOptMask_##name; \
19718 + if (v != (AuOpt_Def & AuOptMask_##name)) \
19719 + seq_printf(m, "," #str "=%s", au_optstr_##str(v)); \
19722 +#define AuUInt(name, str, val) do { \
19723 + if (val != AUFS_##name##_DEF) \
19724 + seq_printf(m, "," #str "=%u", val); \
19727 + /* lock free root dinfo */
19728 + sb = mnt->mnt_sb;
19729 + si_noflush_read_lock(sb);
19730 + sbinfo = au_sbi(sb);
19731 + seq_printf(m, ",si=%lx", sysaufs_si_id(sbinfo));
19733 + mnt_flags = au_mntflags(sb);
19734 + if (au_opt_test(mnt_flags, XINO)) {
19735 + err = au_show_xino(m, mnt);
19736 + if (unlikely(err))
19739 + seq_puts(m, ",noxino");
19741 + AuBool(TRUNC_XINO, trunc_xino);
19742 + AuStr(UDBA, udba);
19743 + AuBool(SHWH, shwh);
19744 + AuBool(PLINK, plink);
19745 + /* AuBool(DIRPERM1, dirperm1); */
19746 + /* AuBool(REFROF, refrof); */
19748 + v = sbinfo->si_wbr_create;
19749 + if (v != AuWbrCreate_Def)
19750 + au_show_wbr_create(m, v, sbinfo);
19752 + v = sbinfo->si_wbr_copyup;
19753 + if (v != AuWbrCopyup_Def)
19754 + seq_printf(m, ",cpup=%s", au_optstr_wbr_copyup(v));
19756 + v = au_opt_test(mnt_flags, ALWAYS_DIROPQ);
19757 + if (v != au_opt_test(AuOpt_Def, ALWAYS_DIROPQ))
19758 + seq_printf(m, ",diropq=%c", v ? 'a' : 'w');
19760 + AuUInt(DIRWH, dirwh, sbinfo->si_dirwh);
19762 + n = sbinfo->si_rdcache / HZ;
19763 + AuUInt(RDCACHE, rdcache, n);
19765 + AuUInt(RDBLK, rdblk, sbinfo->si_rdblk);
19766 + AuUInt(RDHASH, rdhash, sbinfo->si_rdhash);
19768 + AuBool(SUM, sum);
19769 + /* AuBool(SUM_W, wsum); */
19770 + AuBool(WARN_PERM, warn_perm);
19771 + AuBool(VERBOSE, verbose);
19774 + /* be sure to print "br:" last */
19775 + if (!sysaufs_brs) {
19776 + seq_puts(m, ",br:");
19777 + au_show_brs(m, sb);
19779 + si_read_unlock(sb);
19787 +/* ---------------------------------------------------------------------- */
19789 +/* sum mode which returns the summation for statfs(2) */
19791 +static u64 au_add_till_max(u64 a, u64 b)
19799 + return ULLONG_MAX;
19802 +static int au_statfs_sum(struct super_block *sb, struct kstatfs *buf)
19805 + u64 blocks, bfree, bavail, files, ffree;
19806 + aufs_bindex_t bend, bindex, i;
19807 + unsigned char shared;
19808 + struct vfsmount *h_mnt;
19809 + struct super_block *h_sb;
19818 + bend = au_sbend(sb);
19819 + for (bindex = bend; bindex >= 0; bindex--) {
19820 + h_mnt = au_sbr_mnt(sb, bindex);
19821 + h_sb = h_mnt->mnt_sb;
19823 + for (i = bindex + 1; !shared && i <= bend; i++)
19824 + shared = (au_sbr_sb(sb, i) == h_sb);
19828 + /* sb->s_root for NFS is unreliable */
19829 + err = vfs_statfs(h_mnt->mnt_root, buf);
19830 + if (unlikely(err))
19833 + blocks = au_add_till_max(blocks, buf->f_blocks);
19834 + bfree = au_add_till_max(bfree, buf->f_bfree);
19835 + bavail = au_add_till_max(bavail, buf->f_bavail);
19836 + files = au_add_till_max(files, buf->f_files);
19837 + ffree = au_add_till_max(ffree, buf->f_ffree);
19840 + buf->f_blocks = blocks;
19841 + buf->f_bfree = bfree;
19842 + buf->f_bavail = bavail;
19843 + buf->f_files = files;
19844 + buf->f_ffree = ffree;
19850 +static int aufs_statfs(struct dentry *dentry, struct kstatfs *buf)
19853 + struct super_block *sb;
19855 + /* lock free root dinfo */
19856 + sb = dentry->d_sb;
19857 + si_noflush_read_lock(sb);
19858 + if (!au_opt_test(au_mntflags(sb), SUM))
19859 + /* sb->s_root for NFS is unreliable */
19860 + err = vfs_statfs(au_sbr_mnt(sb, 0)->mnt_root, buf);
19862 + err = au_statfs_sum(sb, buf);
19863 + si_read_unlock(sb);
19866 + buf->f_type = AUFS_SUPER_MAGIC;
19867 + buf->f_namelen = AUFS_MAX_NAMELEN;
19868 + memset(&buf->f_fsid, 0, sizeof(buf->f_fsid));
19870 + /* buf->f_bsize = buf->f_blocks = buf->f_bfree = buf->f_bavail = -1; */
19875 +/* ---------------------------------------------------------------------- */
19877 +/* try flushing the lower fs at aufs remount/unmount time */
19879 +static void au_fsync_br(struct super_block *sb)
19881 + aufs_bindex_t bend, bindex;
19883 + struct au_branch *br;
19884 + struct super_block *h_sb;
19886 + bend = au_sbend(sb);
19887 + for (bindex = 0; bindex < bend; bindex++) {
19888 + br = au_sbr(sb, bindex);
19889 + brperm = br->br_perm;
19890 + if (brperm == AuBrPerm_RR || brperm == AuBrPerm_RRWH)
19892 + h_sb = br->br_mnt->mnt_sb;
19893 + if (bdev_read_only(h_sb->s_bdev))
19897 + down_write(&h_sb->s_umount);
19898 + shrink_dcache_sb(h_sb);
19899 + fsync_super(h_sb);
19900 + up_write(&h_sb->s_umount);
19906 + * this IS NOT for super_operations.
19907 + * I guess it will be reverted someday.
19909 +static void aufs_umount_begin(struct super_block *sb)
19911 + struct au_sbinfo *sbinfo;
19913 + sbinfo = au_sbi(sb);
19917 + si_write_lock(sb);
19919 + if (au_opt_test(au_mntflags(sb), PLINK))
19920 + au_plink_put(sb);
19921 + if (sbinfo->si_wbr_create_ops->fin)
19922 + sbinfo->si_wbr_create_ops->fin(sb);
19923 + si_write_unlock(sb);
19926 +/* final actions when unmounting a file system */
19927 +static void aufs_put_super(struct super_block *sb)
19929 + struct au_sbinfo *sbinfo;
19931 + sbinfo = au_sbi(sb);
19935 + aufs_umount_begin(sb);
19936 + dbgaufs_si_fin(sbinfo);
19937 + kobject_put(&sbinfo->si_kobj);
19940 +/* ---------------------------------------------------------------------- */
19943 + * refresh dentry and inode at remount time.
19945 +static int do_refresh(struct dentry *dentry, mode_t type,
19946 + unsigned int dir_flags)
19949 + struct dentry *parent;
19951 + di_write_lock_child(dentry);
19952 + parent = dget_parent(dentry);
19953 + di_read_lock_parent(parent, AuLock_IR);
19955 + /* returns the number of positive dentries */
19956 + err = au_refresh_hdentry(dentry, type);
19958 + struct inode *inode = dentry->d_inode;
19959 + err = au_refresh_hinode(inode, dentry);
19960 + if (!err && type == S_IFDIR)
19961 + au_reset_hinotify(inode, dir_flags);
19963 + if (unlikely(err))
19964 + AuErr("unrecoverable error %d, %.*s\n", err, AuDLNPair(dentry));
19966 + di_read_unlock(parent, AuLock_IR);
19968 + di_write_unlock(dentry);
19973 +static int test_dir(struct dentry *dentry, void *arg __maybe_unused)
19975 + return S_ISDIR(dentry->d_inode->i_mode);
19978 +/* gave up consolidating with refresh_nondir() */
19979 +static int refresh_dir(struct dentry *root, unsigned int sigen)
19981 + int err, i, j, ndentry, e;
19982 + struct au_dcsub_pages dpages;
19983 + struct au_dpage *dpage;
19984 + struct dentry **dentries;
19985 + struct inode *inode;
19986 + const unsigned int flags = au_hi_flags(root->d_inode, /*isdir*/1);
19989 + list_for_each_entry(inode, &root->d_sb->s_inodes, i_sb_list)
19990 + if (S_ISDIR(inode->i_mode) && au_iigen(inode) != sigen) {
19991 + ii_write_lock_child(inode);
19992 + e = au_refresh_hinode_self(inode, /*do_attr*/1);
19993 + ii_write_unlock(inode);
19994 + if (unlikely(e)) {
19995 + AuDbg("e %d, i%lu\n", e, inode->i_ino);
19998 + /* go on even if err */
20002 + e = au_dpages_init(&dpages, GFP_NOFS);
20003 + if (unlikely(e)) {
20008 + e = au_dcsub_pages(&dpages, root, test_dir, NULL);
20009 + if (unlikely(e)) {
20015 + for (i = 0; !e && i < dpages.ndpage; i++) {
20016 + dpage = dpages.dpages + i;
20017 + dentries = dpage->dentries;
20018 + ndentry = dpage->ndentry;
20019 + for (j = 0; !e && j < ndentry; j++) {
20020 + struct dentry *d;
20023 + au_dbg_verify_dir_parent(d, sigen);
20024 + if (au_digen(d) != sigen) {
20025 + e = do_refresh(d, S_IFDIR, flags);
20026 + if (unlikely(e && !err))
20028 + /* break on err */
20034 + au_dpages_free(&dpages);
20039 +static int test_nondir(struct dentry *dentry, void *arg __maybe_unused)
20041 + return !S_ISDIR(dentry->d_inode->i_mode);
20044 +static int refresh_nondir(struct dentry *root, unsigned int sigen,
20047 + int err, i, j, ndentry, e;
20048 + struct au_dcsub_pages dpages;
20049 + struct au_dpage *dpage;
20050 + struct dentry **dentries;
20051 + struct inode *inode;
20054 + list_for_each_entry(inode, &root->d_sb->s_inodes, i_sb_list)
20055 + if (!S_ISDIR(inode->i_mode) && au_iigen(inode) != sigen) {
20056 + ii_write_lock_child(inode);
20057 + e = au_refresh_hinode_self(inode, /*do_attr*/1);
20058 + ii_write_unlock(inode);
20059 + if (unlikely(e)) {
20060 + AuDbg("e %d, i%lu\n", e, inode->i_ino);
20063 + /* go on even if err */
20070 + e = au_dpages_init(&dpages, GFP_NOFS);
20071 + if (unlikely(e)) {
20076 + e = au_dcsub_pages(&dpages, root, test_nondir, NULL);
20077 + if (unlikely(e)) {
20083 + for (i = 0; i < dpages.ndpage; i++) {
20084 + dpage = dpages.dpages + i;
20085 + dentries = dpage->dentries;
20086 + ndentry = dpage->ndentry;
20087 + for (j = 0; j < ndentry; j++) {
20088 + struct dentry *d;
20091 + au_dbg_verify_nondir_parent(d, sigen);
20092 + inode = d->d_inode;
20093 + if (inode && au_digen(d) != sigen) {
20094 + e = do_refresh(d, inode->i_mode & S_IFMT,
20096 + if (unlikely(e && !err))
20098 + /* go on even err */
20104 + au_dpages_free(&dpages);
20109 +static void au_remount_refresh(struct super_block *sb, unsigned int flags)
20112 + unsigned int sigen;
20113 + struct au_sbinfo *sbinfo;
20114 + struct dentry *root;
20115 + struct inode *inode;
20117 + au_sigen_inc(sb);
20118 + sigen = au_sigen(sb);
20119 + sbinfo = au_sbi(sb);
20120 + au_fclr_si(sbinfo, FAILED_REFRESH_DIRS);
20122 + root = sb->s_root;
20123 + DiMustNoWaiters(root);
20124 + inode = root->d_inode;
20125 + IiMustNoWaiters(inode);
20126 + au_reset_hinotify(inode, au_hi_flags(inode, /*isdir*/1));
20127 + di_write_unlock(root);
20129 + err = refresh_dir(root, sigen);
20130 + if (unlikely(err)) {
20131 + au_fset_si(sbinfo, FAILED_REFRESH_DIRS);
20132 + AuWarn("Refreshing directories failed, ignored (%d)\n", err);
20135 + if (au_ftest_opts(flags, REFRESH_NONDIR)) {
20136 + err = refresh_nondir(root, sigen, !err);
20137 + if (unlikely(err))
20138 + AuWarn("Refreshing non-directories failed, ignored"
20142 + /* aufs_write_lock() calls ..._child() */
20143 + di_write_lock_child(root);
20144 + au_cpup_attr_all(root->d_inode, /*force*/1);
20147 +/* stop extra interpretation of errno in mount(8), and strange error messages */
20148 +static int cvt_err(int err)
20162 +static int aufs_remount_fs(struct super_block *sb, int *flags, char *data)
20165 + struct au_opts opts;
20166 + struct dentry *root;
20167 + struct inode *inode;
20168 + struct au_sbinfo *sbinfo;
20171 + root = sb->s_root;
20172 + if (!data || !*data) {
20173 + aufs_write_lock(root);
20174 + err = au_opts_verify(sb, *flags, /*pending*/0);
20177 + aufs_write_unlock(root);
20182 + memset(&opts, 0, sizeof(opts));
20183 + opts.opt = (void *)__get_free_page(GFP_NOFS);
20184 + if (unlikely(!opts.opt))
20186 + opts.max_opt = PAGE_SIZE / sizeof(*opts.opt);
20187 + opts.flags = AuOpts_REMOUNT;
20188 + opts.sb_flags = *flags;
20190 + /* parse it before aufs lock */
20191 + err = au_opts_parse(sb, data, &opts);
20192 + if (unlikely(err))
20195 + sbinfo = au_sbi(sb);
20196 + inode = root->d_inode;
20197 + mutex_lock(&inode->i_mutex);
20198 + aufs_write_lock(root);
20201 + /* au_opts_remount() may return an error */
20202 + err = au_opts_remount(sb, &opts);
20203 + au_opts_free(&opts);
20205 + if (au_ftest_opts(opts.flags, REFRESH_DIR)
20206 + || au_ftest_opts(opts.flags, REFRESH_NONDIR))
20207 + au_remount_refresh(sb, opts.flags);
20209 + aufs_write_unlock(root);
20210 + mutex_unlock(&inode->i_mutex);
20213 + free_page((unsigned long)opts.opt);
20215 + err = cvt_err(err);
20220 +static const struct super_operations aufs_sop = {
20221 + .alloc_inode = aufs_alloc_inode,
20222 + .destroy_inode = aufs_destroy_inode,
20223 + .drop_inode = generic_delete_inode,
20224 + .show_options = aufs_show_options,
20225 + .statfs = aufs_statfs,
20226 + .put_super = aufs_put_super,
20227 + .remount_fs = aufs_remount_fs
20230 +/* ---------------------------------------------------------------------- */
20232 +static int alloc_root(struct super_block *sb)
20235 + struct inode *inode;
20236 + struct dentry *root;
20239 + inode = au_iget_locked(sb, AUFS_ROOT_INO);
20240 + err = PTR_ERR(inode);
20241 + if (IS_ERR(inode))
20244 + inode->i_op = &aufs_dir_iop;
20245 + inode->i_fop = &aufs_dir_fop;
20246 + inode->i_mode = S_IFDIR;
20247 + inode->i_nlink = 2;
20248 + unlock_new_inode(inode);
20250 + root = d_alloc_root(inode);
20251 + if (unlikely(!root))
20253 + err = PTR_ERR(root);
20254 + if (IS_ERR(root))
20257 + err = au_alloc_dinfo(root);
20259 + sb->s_root = root;
20260 + return 0; /* success */
20263 + goto out; /* do not iput */
20266 + iget_failed(inode);
20273 +static int aufs_fill_super(struct super_block *sb, void *raw_data,
20274 + int silent __maybe_unused)
20277 + struct au_opts opts;
20278 + struct dentry *root;
20279 + struct inode *inode;
20280 + char *arg = raw_data;
20282 + if (unlikely(!arg || !*arg)) {
20284 + AuErr("no arg\n");
20289 + memset(&opts, 0, sizeof(opts));
20290 + opts.opt = (void *)__get_free_page(GFP_NOFS);
20291 + if (unlikely(!opts.opt))
20293 + opts.max_opt = PAGE_SIZE / sizeof(*opts.opt);
20294 + opts.sb_flags = sb->s_flags;
20296 + err = au_si_alloc(sb);
20297 + if (unlikely(err))
20300 + /* all timestamps always follow the ones on the branch */
20301 + sb->s_flags |= MS_NOATIME | MS_NODIRATIME;
20302 + sb->s_op = &aufs_sop;
20303 + sb->s_magic = AUFS_SUPER_MAGIC;
20304 + sb->s_maxbytes = 0;
20305 + au_export_init(sb);
20307 + err = alloc_root(sb);
20308 + if (unlikely(err)) {
20309 + si_write_unlock(sb);
20312 + root = sb->s_root;
20313 + inode = root->d_inode;
20316 + * actually we can parse options regardless aufs lock here.
20317 + * but at remount time, parsing must be done before aufs lock.
20318 + * so we follow the same rule.
20320 + ii_write_lock_parent(inode);
20321 + aufs_write_unlock(root);
20322 + err = au_opts_parse(sb, arg, &opts);
20323 + if (unlikely(err))
20326 + /* lock vfs_inode first, then aufs. */
20327 + mutex_lock(&inode->i_mutex);
20328 + inode->i_op = &aufs_dir_iop;
20329 + inode->i_fop = &aufs_dir_fop;
20330 + aufs_write_lock(root);
20331 + err = au_opts_mount(sb, &opts);
20332 + au_opts_free(&opts);
20333 + if (unlikely(err))
20335 + aufs_write_unlock(root);
20336 + mutex_unlock(&inode->i_mutex);
20337 + goto out_opts; /* success */
20340 + aufs_write_unlock(root);
20341 + mutex_unlock(&inode->i_mutex);
20344 + sb->s_root = NULL;
20346 + kobject_put(&au_sbi(sb)->si_kobj);
20347 + sb->s_fs_info = NULL;
20349 + free_page((unsigned long)opts.opt);
20352 + err = cvt_err(err);
20357 +/* ---------------------------------------------------------------------- */
20359 +static int aufs_get_sb(struct file_system_type *fs_type, int flags,
20360 + const char *dev_name __maybe_unused, void *raw_data,
20361 + struct vfsmount *mnt)
20364 + struct super_block *sb;
20366 + /* all timestamps always follow the ones on the branch */
20367 + /* mnt->mnt_flags |= MNT_NOATIME | MNT_NODIRATIME; */
20368 + err = get_sb_nodev(fs_type, flags, raw_data, aufs_fill_super, mnt);
20370 + sb = mnt->mnt_sb;
20371 + si_write_lock(sb);
20372 + sysaufs_brs_add(sb, 0);
20373 + si_write_unlock(sb);
20378 +struct file_system_type aufs_fs_type = {
20379 + .name = AUFS_FSTYPE,
20381 + FS_RENAME_DOES_D_MOVE /* a race between rename and others */
20382 + | FS_REVAL_DOT, /* for NFS branch and udba */
20383 + .get_sb = aufs_get_sb,
20384 + .kill_sb = generic_shutdown_super,
20385 + /* no need to __module_get() and module_put(). */
20386 + .owner = THIS_MODULE,
20388 diff --git a/fs/aufs/super.h b/fs/aufs/super.h
20389 new file mode 100644
20390 index 0000000..33a2b73
20392 +++ b/fs/aufs/super.h
20395 + * Copyright (C) 2005-2009 Junjiro R. Okajima
20397 + * This program, aufs is free software; you can redistribute it and/or modify
20398 + * it under the terms of the GNU General Public License as published by
20399 + * the Free Software Foundation; either version 2 of the License, or
20400 + * (at your option) any later version.
20402 + * This program is distributed in the hope that it will be useful,
20403 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
20404 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20405 + * GNU General Public License for more details.
20407 + * You should have received a copy of the GNU General Public License
20408 + * along with this program; if not, write to the Free Software
20409 + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
20413 + * super_block operations
20416 +#ifndef __AUFS_SUPER_H__
20417 +#define __AUFS_SUPER_H__
20421 +#include <linux/fs.h>
20422 +#include <linux/aufs_type.h>
20423 +#include "rwsem.h"
20427 +typedef ssize_t (*au_readf_t)(struct file *, char __user *, size_t, loff_t *);
20428 +typedef ssize_t (*au_writef_t)(struct file *, const char __user *, size_t,
20431 +/* policies to select one among multiple writable branches */
20432 +struct au_wbr_copyup_operations {
20433 + int (*copyup)(struct dentry *dentry);
20436 +struct au_wbr_create_operations {
20437 + int (*create)(struct dentry *dentry, int isdir);
20438 + int (*init)(struct super_block *sb);
20439 + int (*fin)(struct super_block *sb);
20442 +struct au_wbr_mfs {
20443 + struct mutex mfs_lock; /* protect this structure */
20444 + unsigned long mfs_jiffy;
20445 + unsigned long mfs_expire;
20446 + aufs_bindex_t mfs_bindex;
20448 + unsigned long long mfsrr_bytes;
20449 + unsigned long long mfsrr_watermark;
20453 +struct au_sbinfo {
20454 + /* nowait tasks in the system-wide workqueue */
20455 + struct au_nowait_tasks si_nowait;
20457 + struct au_rwsem si_rwsem;
20459 + /* branch management */
20460 + unsigned int si_generation;
20462 + /* see above flags */
20463 + unsigned char au_si_status;
20465 + aufs_bindex_t si_bend;
20466 + aufs_bindex_t si_last_br_id;
20467 + struct au_branch **si_branch;
20469 + /* policy to select a writable branch */
20470 + unsigned char si_wbr_copyup;
20471 + unsigned char si_wbr_create;
20472 + struct au_wbr_copyup_operations *si_wbr_copyup_ops;
20473 + struct au_wbr_create_operations *si_wbr_create_ops;
20475 + /* round robin */
20476 + atomic_t si_wbr_rr_next;
20478 + /* most free space */
20479 + struct au_wbr_mfs si_wbr_mfs;
20481 + /* mount flags */
20482 + /* include/asm-ia64/siginfo.h defines a macro named si_flags */
20483 + unsigned int si_mntflags;
20485 + /* external inode number (bitmap and translation table) */
20486 + au_readf_t si_xread;
20487 + au_writef_t si_xwrite;
20488 + struct file *si_xib;
20489 + struct mutex si_xib_mtx; /* protect xib members */
20490 + unsigned long *si_xib_buf;
20491 + unsigned long si_xib_last_pindex;
20492 + int si_xib_next_bit;
20493 + aufs_bindex_t si_xino_brid;
20494 + /* reserved for future use */
20495 + /* unsigned long long si_xib_limit; */ /* Max xib file size */
20497 +#ifdef CONFIG_AUFS_EXPORT
20498 + /* i_generation */
20499 + struct file *si_xigen;
20500 + atomic_t si_xigen_next;
20503 + /* vdir parameters */
20504 + unsigned long si_rdcache; /* max cache time in HZ */
20505 + unsigned int si_rdblk; /* deblk size */
20506 + unsigned int si_rdhash; /* hash size */
20509 + * If the number of whiteouts are larger than si_dirwh, leave all of
20510 + * them after au_whtmp_ren to reduce the cost of rmdir(2).
20511 + * future fsck.aufs or kernel thread will remove them later.
20512 + * Otherwise, remove all whiteouts and the dir in rmdir(2).
20514 + unsigned int si_dirwh;
20517 + * rename(2) a directory with all children.
20519 + /* reserved for future use */
20520 + /* int si_rendir; */
20522 + /* pseudo_link list */
20523 + struct au_splhead si_plink;
20524 + wait_queue_head_t si_plink_wq;
20525 + spinlock_t si_plink_maint_lock;
20526 + struct file *si_plink_maint;
20529 + * sysfs and lifetime management.
20530 + * this is not a small structure and it may be a waste of memory in case
20531 + * of sysfs is disabled, particulary when many aufs-es are mounted.
20532 + * but using sysfs is majority.
20534 + struct kobject si_kobj;
20535 +#ifdef CONFIG_DEBUG_FS
20536 + struct dentry *si_dbgaufs, *si_dbgaufs_xib;
20537 +#ifdef CONFIG_AUFS_EXPORT
20538 + struct dentry *si_dbgaufs_xigen;
20542 + /* dirty, necessary for unmounting, sysfs and sysrq */
20543 + struct super_block *si_sb;
20546 +/* sbinfo status flags */
20548 + * set true when refresh_dirs() failed at remount time.
20549 + * then try refreshing dirs at access time again.
20550 + * if it is false, refreshing dirs at access time is unnecesary
20552 +#define AuSi_FAILED_REFRESH_DIRS 1
20553 +static inline unsigned char au_do_ftest_si(struct au_sbinfo *sbi,
20554 + unsigned int flag)
20556 + AuRwMustAnyLock(&sbi->si_rwsem);
20557 + return sbi->au_si_status & flag;
20559 +#define au_ftest_si(sbinfo, name) au_do_ftest_si(sbinfo, AuSi_##name)
20560 +#define au_fset_si(sbinfo, name) do { \
20561 + AuRwMustWriteLock(&(sbinfo)->si_rwsem); \
20562 + (sbinfo)->au_si_status |= AuSi_##name; \
20564 +#define au_fclr_si(sbinfo, name) do { \
20565 + AuRwMustWriteLock(&(sbinfo)->si_rwsem); \
20566 + (sbinfo)->au_si_status &= ~AuSi_##name; \
20569 +/* ---------------------------------------------------------------------- */
20571 +/* policy to select one among writable branches */
20572 +#define AuWbrCopyup(sbinfo, ...) \
20573 + ((sbinfo)->si_wbr_copyup_ops->copyup(__VA_ARGS__))
20574 +#define AuWbrCreate(sbinfo, ...) \
20575 + ((sbinfo)->si_wbr_create_ops->create(__VA_ARGS__))
20577 +/* flags for si_read_lock()/aufs_read_lock()/di_read_lock() */
20578 +#define AuLock_DW 1 /* write-lock dentry */
20579 +#define AuLock_IR (1 << 1) /* read-lock inode */
20580 +#define AuLock_IW (1 << 2) /* write-lock inode */
20581 +#define AuLock_FLUSH (1 << 3) /* wait for 'nowait' tasks */
20582 +#define AuLock_DIR (1 << 4) /* target is a dir */
20583 +#define au_ftest_lock(flags, name) ((flags) & AuLock_##name)
20584 +#define au_fset_lock(flags, name) { (flags) |= AuLock_##name; }
20585 +#define au_fclr_lock(flags, name) { (flags) &= ~AuLock_##name; }
20587 +/* ---------------------------------------------------------------------- */
20590 +extern struct file_system_type aufs_fs_type;
20591 +struct inode *au_iget_locked(struct super_block *sb, ino_t ino);
20594 +void au_si_free(struct kobject *kobj);
20595 +int au_si_alloc(struct super_block *sb);
20596 +int au_sbr_realloc(struct au_sbinfo *sbinfo, int nbr);
20598 +unsigned int au_sigen_inc(struct super_block *sb);
20599 +aufs_bindex_t au_new_br_id(struct super_block *sb);
20601 +void aufs_read_lock(struct dentry *dentry, int flags);
20602 +void aufs_read_unlock(struct dentry *dentry, int flags);
20603 +void aufs_write_lock(struct dentry *dentry);
20604 +void aufs_write_unlock(struct dentry *dentry);
20605 +void aufs_read_and_write_lock2(struct dentry *d1, struct dentry *d2, int isdir);
20606 +void aufs_read_and_write_unlock2(struct dentry *d1, struct dentry *d2);
20608 +/* wbr_policy.c */
20609 +extern struct au_wbr_copyup_operations au_wbr_copyup_ops[];
20610 +extern struct au_wbr_create_operations au_wbr_create_ops[];
20611 +int au_cpdown_dirs(struct dentry *dentry, aufs_bindex_t bdst);
20613 +/* ---------------------------------------------------------------------- */
20615 +static inline struct au_sbinfo *au_sbi(struct super_block *sb)
20617 + return sb->s_fs_info;
20620 +/* ---------------------------------------------------------------------- */
20622 +#ifdef CONFIG_AUFS_EXPORT
20623 +void au_export_init(struct super_block *sb);
20625 +static inline int au_test_nfsd(struct task_struct *tsk)
20627 + return !tsk->mm && !strcmp(tsk->comm, "nfsd");
20630 +int au_xigen_inc(struct inode *inode);
20631 +int au_xigen_new(struct inode *inode);
20632 +int au_xigen_set(struct super_block *sb, struct file *base);
20633 +void au_xigen_clr(struct super_block *sb);
20635 +static inline int au_busy_or_stale(void)
20637 + if (!au_test_nfsd(current))
20642 +AuStubVoid(au_export_init, struct super_block *sb)
20643 +AuStubInt0(au_test_nfsd, struct task_struct *tsk)
20644 +AuStubInt0(au_xigen_inc, struct inode *inode)
20645 +AuStubInt0(au_xigen_new, struct inode *inode)
20646 +AuStubInt0(au_xigen_set, struct super_block *sb, struct file *base)
20647 +AuStubVoid(au_xigen_clr, struct super_block *sb)
20648 +static inline int au_busy_or_stale(void)
20652 +#endif /* CONFIG_AUFS_EXPORT */
20654 +/* ---------------------------------------------------------------------- */
20656 +static inline void dbgaufs_si_null(struct au_sbinfo *sbinfo)
20659 + * This function is a dynamic '__init' fucntion actually,
20660 + * so the tiny check for si_rwsem is unnecessary.
20662 + /* AuRwMustWriteLock(&sbinfo->si_rwsem); */
20663 +#ifdef CONFIG_DEBUG_FS
20664 + sbinfo->si_dbgaufs = NULL;
20665 + sbinfo->si_dbgaufs_xib = NULL;
20666 +#ifdef CONFIG_AUFS_EXPORT
20667 + sbinfo->si_dbgaufs_xigen = NULL;
20672 +/* ---------------------------------------------------------------------- */
20674 +/* lock superblock. mainly for entry point functions */
20676 + * si_noflush_read_lock, si_noflush_write_lock,
20677 + * si_read_unlock, si_write_unlock, si_downgrade_lock
20679 +AuSimpleLockRwsemFuncs(si_noflush, struct super_block *sb,
20680 + &au_sbi(sb)->si_rwsem);
20681 +AuSimpleUnlockRwsemFuncs(si, struct super_block *sb, &au_sbi(sb)->si_rwsem);
20683 +#define SiMustNoWaiters(sb) AuRwMustNoWaiters(&au_sbi(sb)->si_rwsem)
20684 +#define SiMustAnyLock(sb) AuRwMustAnyLock(&au_sbi(sb)->si_rwsem)
20685 +#define SiMustWriteLock(sb) AuRwMustWriteLock(&au_sbi(sb)->si_rwsem)
20687 +static inline void si_read_lock(struct super_block *sb, int flags)
20689 + if (au_ftest_lock(flags, FLUSH))
20690 + au_nwt_flush(&au_sbi(sb)->si_nowait);
20691 + si_noflush_read_lock(sb);
20694 +static inline void si_write_lock(struct super_block *sb)
20696 + au_nwt_flush(&au_sbi(sb)->si_nowait);
20697 + si_noflush_write_lock(sb);
20700 +static inline int si_read_trylock(struct super_block *sb, int flags)
20702 + if (au_ftest_lock(flags, FLUSH))
20703 + au_nwt_flush(&au_sbi(sb)->si_nowait);
20704 + return si_noflush_read_trylock(sb);
20707 +static inline int si_write_trylock(struct super_block *sb, int flags)
20709 + if (au_ftest_lock(flags, FLUSH))
20710 + au_nwt_flush(&au_sbi(sb)->si_nowait);
20711 + return si_noflush_write_trylock(sb);
20714 +/* ---------------------------------------------------------------------- */
20716 +static inline aufs_bindex_t au_sbend(struct super_block *sb)
20718 + SiMustAnyLock(sb);
20719 + return au_sbi(sb)->si_bend;
20722 +static inline unsigned int au_mntflags(struct super_block *sb)
20724 + SiMustAnyLock(sb);
20725 + return au_sbi(sb)->si_mntflags;
20728 +static inline unsigned int au_sigen(struct super_block *sb)
20730 + SiMustAnyLock(sb);
20731 + return au_sbi(sb)->si_generation;
20734 +static inline struct au_branch *au_sbr(struct super_block *sb,
20735 + aufs_bindex_t bindex)
20737 + SiMustAnyLock(sb);
20738 + return au_sbi(sb)->si_branch[0 + bindex];
20741 +static inline void au_xino_brid_set(struct super_block *sb, aufs_bindex_t brid)
20743 + SiMustWriteLock(sb);
20744 + au_sbi(sb)->si_xino_brid = brid;
20747 +static inline aufs_bindex_t au_xino_brid(struct super_block *sb)
20749 + SiMustAnyLock(sb);
20750 + return au_sbi(sb)->si_xino_brid;
20753 +#endif /* __KERNEL__ */
20754 +#endif /* __AUFS_SUPER_H__ */
20755 diff --git a/fs/aufs/sysaufs.c b/fs/aufs/sysaufs.c
20756 new file mode 100644
20757 index 0000000..b796330
20759 +++ b/fs/aufs/sysaufs.c
20762 + * Copyright (C) 2005-2009 Junjiro R. Okajima
20764 + * This program, aufs is free software; you can redistribute it and/or modify
20765 + * it under the terms of the GNU General Public License as published by
20766 + * the Free Software Foundation; either version 2 of the License, or
20767 + * (at your option) any later version.
20769 + * This program is distributed in the hope that it will be useful,
20770 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
20771 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20772 + * GNU General Public License for more details.
20774 + * You should have received a copy of the GNU General Public License
20775 + * along with this program; if not, write to the Free Software
20776 + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
20780 + * sysfs interface and lifetime management
20781 + * they are necessary regardless sysfs is disabled.
20784 +#include <linux/fs.h>
20785 +#include <linux/random.h>
20786 +#include <linux/sysfs.h>
20789 +unsigned long sysaufs_si_mask;
20790 +struct kset *sysaufs_ket;
20792 +#define AuSiAttr(_name) { \
20793 + .attr = { .name = __stringify(_name), .mode = 0444 }, \
20794 + .show = sysaufs_si_##_name, \
20797 +static struct sysaufs_si_attr sysaufs_si_attr_xi_path = AuSiAttr(xi_path);
20798 +struct attribute *sysaufs_si_attrs[] = {
20799 + &sysaufs_si_attr_xi_path.attr,
20803 +static struct sysfs_ops au_sbi_ops = {
20804 + .show = sysaufs_si_show
20807 +static struct kobj_type au_sbi_ktype = {
20808 + .release = au_si_free,
20809 + .sysfs_ops = &au_sbi_ops,
20810 + .default_attrs = sysaufs_si_attrs
20813 +/* ---------------------------------------------------------------------- */
20815 +int sysaufs_si_init(struct au_sbinfo *sbinfo)
20819 + sbinfo->si_kobj.kset = sysaufs_ket;
20820 + /* cf. sysaufs_name() */
20821 + err = kobject_init_and_add
20822 + (&sbinfo->si_kobj, &au_sbi_ktype, /*&sysaufs_ket->kobj*/NULL,
20823 + SysaufsSiNamePrefix "%lx", sysaufs_si_id(sbinfo));
20825 + dbgaufs_si_null(sbinfo);
20827 + err = dbgaufs_si_init(sbinfo);
20828 + if (unlikely(err))
20829 + kobject_put(&sbinfo->si_kobj);
20834 +void sysaufs_fin(void)
20837 + sysfs_remove_group(&sysaufs_ket->kobj, sysaufs_attr_group);
20838 + kset_unregister(sysaufs_ket);
20841 +int __init sysaufs_init(void)
20846 + get_random_bytes(&sysaufs_si_mask, sizeof(sysaufs_si_mask));
20847 + } while (!sysaufs_si_mask);
20849 + sysaufs_ket = kset_create_and_add(AUFS_NAME, NULL, fs_kobj);
20850 + err = PTR_ERR(sysaufs_ket);
20851 + if (IS_ERR(sysaufs_ket))
20853 + err = sysfs_create_group(&sysaufs_ket->kobj, sysaufs_attr_group);
20854 + if (unlikely(err)) {
20855 + kset_unregister(sysaufs_ket);
20859 + err = dbgaufs_init();
20860 + if (unlikely(err))
20865 diff --git a/fs/aufs/sysaufs.h b/fs/aufs/sysaufs.h
20866 new file mode 100644
20867 index 0000000..58019f4
20869 +++ b/fs/aufs/sysaufs.h
20872 + * Copyright (C) 2005-2009 Junjiro R. Okajima
20874 + * This program, aufs is free software; you can redistribute it and/or modify
20875 + * it under the terms of the GNU General Public License as published by
20876 + * the Free Software Foundation; either version 2 of the License, or
20877 + * (at your option) any later version.
20879 + * This program is distributed in the hope that it will be useful,
20880 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
20881 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20882 + * GNU General Public License for more details.
20884 + * You should have received a copy of the GNU General Public License
20885 + * along with this program; if not, write to the Free Software
20886 + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
20890 + * sysfs interface and mount lifetime management
20893 +#ifndef __SYSAUFS_H__
20894 +#define __SYSAUFS_H__
20898 +#include <linux/sysfs.h>
20899 +#include <linux/aufs_type.h>
20900 +#include "module.h"
20902 +struct super_block;
20905 +struct sysaufs_si_attr {
20906 + struct attribute attr;
20907 + int (*show)(struct seq_file *seq, struct super_block *sb);
20910 +/* ---------------------------------------------------------------------- */
20913 +extern unsigned long sysaufs_si_mask;
20914 +extern struct kset *sysaufs_ket;
20915 +extern struct attribute *sysaufs_si_attrs[];
20916 +int sysaufs_si_init(struct au_sbinfo *sbinfo);
20917 +int __init sysaufs_init(void);
20918 +void sysaufs_fin(void);
20920 +/* ---------------------------------------------------------------------- */
20922 +/* some people doesn't like to show a pointer in kernel */
20923 +static inline unsigned long sysaufs_si_id(struct au_sbinfo *sbinfo)
20925 + return sysaufs_si_mask ^ (unsigned long)sbinfo;
20928 +#define SysaufsSiNamePrefix "si_"
20929 +#define SysaufsSiNameLen (sizeof(SysaufsSiNamePrefix) + 16)
20930 +static inline void sysaufs_name(struct au_sbinfo *sbinfo, char *name)
20932 + snprintf(name, SysaufsSiNameLen, SysaufsSiNamePrefix "%lx",
20933 + sysaufs_si_id(sbinfo));
20937 +#ifdef CONFIG_SYSFS
20939 +extern struct attribute_group *sysaufs_attr_group;
20941 +int sysaufs_si_xi_path(struct seq_file *seq, struct super_block *sb);
20942 +ssize_t sysaufs_si_show(struct kobject *kobj, struct attribute *attr,
20945 +void sysaufs_br_init(struct au_branch *br);
20946 +void sysaufs_brs_add(struct super_block *sb, aufs_bindex_t bindex);
20947 +void sysaufs_brs_del(struct super_block *sb, aufs_bindex_t bindex);
20949 +#define sysaufs_brs_init() do {} while (0)
20952 +#define sysaufs_attr_group NULL
20954 +AuStubInt0(sysaufs_si_xi_path, struct seq_file *seq, struct super_block *sb)
20957 +ssize_t sysaufs_si_show(struct kobject *kobj, struct attribute *attr,
20963 +AuStubVoid(sysaufs_br_init, struct au_branch *br)
20964 +AuStubVoid(sysaufs_brs_add, struct super_block *sb, aufs_bindex_t bindex)
20965 +AuStubVoid(sysaufs_brs_del, struct super_block *sb, aufs_bindex_t bindex)
20967 +static inline void sysaufs_brs_init(void)
20972 +#endif /* CONFIG_SYSFS */
20974 +#endif /* __KERNEL__ */
20975 +#endif /* __SYSAUFS_H__ */
20976 diff --git a/fs/aufs/sysfs.c b/fs/aufs/sysfs.c
20977 new file mode 100644
20978 index 0000000..55602fa
20980 +++ b/fs/aufs/sysfs.c
20983 + * Copyright (C) 2005-2009 Junjiro R. Okajima
20985 + * This program, aufs is free software; you can redistribute it and/or modify
20986 + * it under the terms of the GNU General Public License as published by
20987 + * the Free Software Foundation; either version 2 of the License, or
20988 + * (at your option) any later version.
20990 + * This program is distributed in the hope that it will be useful,
20991 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
20992 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20993 + * GNU General Public License for more details.
20995 + * You should have received a copy of the GNU General Public License
20996 + * along with this program; if not, write to the Free Software
20997 + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
21001 + * sysfs interface
21004 +#include <linux/fs.h>
21005 +#include <linux/module.h>
21006 +#include <linux/seq_file.h>
21007 +#include <linux/sysfs.h>
21010 +static struct attribute *au_attr[] = {
21011 + NULL, /* need to NULL terminate the list of attributes */
21014 +static struct attribute_group sysaufs_attr_group_body = {
21018 +struct attribute_group *sysaufs_attr_group = &sysaufs_attr_group_body;
21020 +/* ---------------------------------------------------------------------- */
21022 +int sysaufs_si_xi_path(struct seq_file *seq, struct super_block *sb)
21026 + SiMustAnyLock(sb);
21029 + if (au_opt_test(au_mntflags(sb), XINO)) {
21030 + err = au_xino_path(seq, au_sbi(sb)->si_xib);
21031 + seq_putc(seq, '\n');
21037 + * the lifetime of branch is independent from the entry under sysfs.
21038 + * sysfs handles the lifetime of the entry, and never call ->show() after it is
21041 +static int sysaufs_si_br(struct seq_file *seq, struct super_block *sb,
21042 + aufs_bindex_t bindex)
21044 + struct path path;
21045 + struct dentry *root;
21046 + struct au_branch *br;
21048 + AuDbg("b%d\n", bindex);
21050 + root = sb->s_root;
21051 + di_read_lock_parent(root, !AuLock_IR);
21052 + br = au_sbr(sb, bindex);
21053 + path.mnt = br->br_mnt;
21054 + path.dentry = au_h_dptr(root, bindex);
21055 + au_seq_path(seq, &path);
21056 + di_read_unlock(root, !AuLock_IR);
21057 + seq_printf(seq, "=%s\n", au_optstr_br_perm(br->br_perm));
21061 +/* ---------------------------------------------------------------------- */
21063 +static struct seq_file *au_seq(char *p, ssize_t len)
21065 + struct seq_file *seq;
21067 + seq = kzalloc(sizeof(*seq), GFP_NOFS);
21069 + /* mutex_init(&seq.lock); */
21072 + return seq; /* success */
21075 + seq = ERR_PTR(-ENOMEM);
21079 +#define SysaufsBr_PREFIX "br"
21081 +/* todo: file size may exceed PAGE_SIZE */
21082 +ssize_t sysaufs_si_show(struct kobject *kobj, struct attribute *attr,
21087 + aufs_bindex_t bend;
21088 + struct au_sbinfo *sbinfo;
21089 + struct super_block *sb;
21090 + struct seq_file *seq;
21092 + struct attribute **cattr;
21094 + sbinfo = container_of(kobj, struct au_sbinfo, si_kobj);
21095 + sb = sbinfo->si_sb;
21096 + si_noflush_read_lock(sb);
21098 + seq = au_seq(buf, PAGE_SIZE);
21099 + err = PTR_ERR(seq);
21103 + name = (void *)attr->name;
21104 + cattr = sysaufs_si_attrs;
21106 + if (!strcmp(name, (*cattr)->name)) {
21107 + err = container_of(*cattr, struct sysaufs_si_attr, attr)
21114 + bend = au_sbend(sb);
21115 + if (!strncmp(name, SysaufsBr_PREFIX, sizeof(SysaufsBr_PREFIX) - 1)) {
21116 + name += sizeof(SysaufsBr_PREFIX) - 1;
21117 + err = strict_strtol(name, 10, &l);
21120 + err = sysaufs_si_br(seq, sb, (aufs_bindex_t)l);
21130 + err = seq->count;
21131 + /* sysfs limit */
21132 + if (unlikely(err == PAGE_SIZE))
21137 + si_read_unlock(sb);
21141 +/* ---------------------------------------------------------------------- */
21143 +void sysaufs_br_init(struct au_branch *br)
21145 + br->br_attr.name = br->br_name;
21146 + br->br_attr.mode = S_IRUGO;
21147 + br->br_attr.owner = THIS_MODULE;
21150 +void sysaufs_brs_del(struct super_block *sb, aufs_bindex_t bindex)
21152 + struct au_branch *br;
21153 + struct kobject *kobj;
21154 + aufs_bindex_t bend;
21156 + dbgaufs_brs_del(sb, bindex);
21158 + if (!sysaufs_brs)
21161 + kobj = &au_sbi(sb)->si_kobj;
21162 + bend = au_sbend(sb);
21163 + for (; bindex <= bend; bindex++) {
21164 + br = au_sbr(sb, bindex);
21165 + sysfs_remove_file(kobj, &br->br_attr);
21169 +void sysaufs_brs_add(struct super_block *sb, aufs_bindex_t bindex)
21172 + aufs_bindex_t bend;
21173 + struct kobject *kobj;
21174 + struct au_branch *br;
21176 + dbgaufs_brs_add(sb, bindex);
21178 + if (!sysaufs_brs)
21181 + kobj = &au_sbi(sb)->si_kobj;
21182 + bend = au_sbend(sb);
21183 + for (; bindex <= bend; bindex++) {
21184 + br = au_sbr(sb, bindex);
21185 + snprintf(br->br_name, sizeof(br->br_name), SysaufsBr_PREFIX
21187 + err = sysfs_create_file(kobj, &br->br_attr);
21188 + if (unlikely(err))
21189 + AuWarn("failed %s under sysfs(%d)\n", br->br_name, err);
21192 diff --git a/fs/aufs/sysrq.c b/fs/aufs/sysrq.c
21193 new file mode 100644
21194 index 0000000..979ac73
21196 +++ b/fs/aufs/sysrq.c
21199 + * Copyright (C) 2005-2009 Junjiro R. Okajima
21201 + * This program, aufs is free software; you can redistribute it and/or modify
21202 + * it under the terms of the GNU General Public License as published by
21203 + * the Free Software Foundation; either version 2 of the License, or
21204 + * (at your option) any later version.
21206 + * This program is distributed in the hope that it will be useful,
21207 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
21208 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21209 + * GNU General Public License for more details.
21211 + * You should have received a copy of the GNU General Public License
21212 + * along with this program; if not, write to the Free Software
21213 + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
21217 + * magic sysrq hanlder
21220 +#include <linux/fs.h>
21221 +#include <linux/module.h>
21222 +#include <linux/moduleparam.h>
21223 +/* #include <linux/sysrq.h> */
21226 +/* ---------------------------------------------------------------------- */
21228 +static void sysrq_sb(struct super_block *sb)
21231 + struct au_sbinfo *sbinfo;
21232 + struct file *file;
21234 + plevel = au_plevel;
21235 + au_plevel = KERN_WARNING;
21238 + sbinfo = au_sbi(sb);
21239 + pr_warning("si=%lx\n", sysaufs_si_id(sbinfo));
21240 + pr_warning(AUFS_NAME ": superblock\n");
21242 + pr_warning(AUFS_NAME ": root dentry\n");
21243 + au_dpri_dentry(sb->s_root);
21244 + pr_warning(AUFS_NAME ": root inode\n");
21245 + au_dpri_inode(sb->s_root->d_inode);
21248 + pr_warning(AUFS_NAME ": isolated inode\n");
21249 + list_for_each_entry(i, &sb->s_inodes, i_sb_list)
21250 + if (list_empty(&i->i_dentry))
21251 + au_dpri_inode(i);
21253 + pr_warning(AUFS_NAME ": files\n");
21254 + list_for_each_entry(file, &sb->s_files, f_u.fu_list) {
21256 + mode = file->f_dentry->d_inode->i_mode;
21257 + if (!special_file(mode) || au_special_file(mode))
21258 + au_dpri_file(file);
21261 + au_plevel = plevel;
21265 +/* ---------------------------------------------------------------------- */
21267 +/* module parameter */
21268 +static char *aufs_sysrq_key = "a";
21269 +module_param_named(sysrq, aufs_sysrq_key, charp, S_IRUGO);
21270 +MODULE_PARM_DESC(sysrq, "MagicSysRq key for " AUFS_NAME);
21272 +static void au_sysrq(int key __maybe_unused,
21273 + struct tty_struct *tty __maybe_unused)
21275 + struct kobject *kobj;
21276 + struct au_sbinfo *sbinfo;
21278 + /* spin_lock(&sysaufs_ket->list_lock); */
21279 + list_for_each_entry(kobj, &sysaufs_ket->list, entry) {
21280 + sbinfo = container_of(kobj, struct au_sbinfo, si_kobj);
21281 + sysrq_sb(sbinfo->si_sb);
21283 + /* spin_unlock(&sysaufs_ket->list_lock); */
21286 +static struct sysrq_key_op au_sysrq_op = {
21287 + .handler = au_sysrq,
21288 + .help_msg = "Aufs",
21289 + .action_msg = "Aufs",
21290 + .enable_mask = SYSRQ_ENABLE_DUMP
21293 +/* ---------------------------------------------------------------------- */
21295 +int __init au_sysrq_init(void)
21301 + key = *aufs_sysrq_key;
21302 + if ('a' <= key && key <= 'z')
21303 + err = register_sysrq_key(key, &au_sysrq_op);
21304 + if (unlikely(err))
21305 + AuErr("err %d, sysrq=%c\n", err, key);
21309 +void au_sysrq_fin(void)
21312 + err = unregister_sysrq_key(*aufs_sysrq_key, &au_sysrq_op);
21313 + if (unlikely(err))
21314 + AuErr("err %d (ignored)\n", err);
21316 diff --git a/fs/aufs/vdir.c b/fs/aufs/vdir.c
21317 new file mode 100644
21318 index 0000000..7c68962
21320 +++ b/fs/aufs/vdir.c
21323 + * Copyright (C) 2005-2009 Junjiro R. Okajima
21325 + * This program, aufs is free software; you can redistribute it and/or modify
21326 + * it under the terms of the GNU General Public License as published by
21327 + * the Free Software Foundation; either version 2 of the License, or
21328 + * (at your option) any later version.
21330 + * This program is distributed in the hope that it will be useful,
21331 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
21332 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21333 + * GNU General Public License for more details.
21335 + * You should have received a copy of the GNU General Public License
21336 + * along with this program; if not, write to the Free Software
21337 + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
21341 + * virtual or vertical directory
21344 +#include <linux/hash.h>
21347 +static unsigned int calc_size(int nlen)
21349 + return ALIGN(sizeof(struct au_vdir_de) + nlen, sizeof(ino_t));
21352 +static int set_deblk_end(union au_vdir_deblk_p *p,
21353 + union au_vdir_deblk_p *deblk_end)
21355 + if (calc_size(0) <= deblk_end->deblk - p->deblk) {
21356 + p->de->de_str.len = 0;
21360 + return -1; /* error */
21363 +/* returns true or false */
21364 +static int is_deblk_end(union au_vdir_deblk_p *p,
21365 + union au_vdir_deblk_p *deblk_end)
21367 + if (calc_size(0) <= deblk_end->deblk - p->deblk)
21368 + return !p->de->de_str.len;
21372 +static unsigned char *last_deblk(struct au_vdir *vdir)
21374 + return vdir->vd_deblk[vdir->vd_nblk - 1];
21377 +/* ---------------------------------------------------------------------- */
21379 +/* estimate the apropriate size for name hash table */
21380 +unsigned int au_rdhash_est(loff_t sz)
21388 + if (sz < AUFS_RDHASH_DEF)
21389 + n = AUFS_RDHASH_DEF;
21390 + /* AuInfo("n %u\n", n); */
21395 + * the allocated memory has to be freed by
21396 + * au_nhash_wh_free() or au_nhash_de_free().
21398 +int au_nhash_alloc(struct au_nhash *nhash, unsigned int num_hash, gfp_t gfp)
21400 + struct hlist_head *head;
21403 + head = kmalloc(sizeof(*nhash->nh_head) * num_hash, gfp);
21405 + nhash->nh_num = num_hash;
21406 + nhash->nh_head = head;
21407 + for (u = 0; u < num_hash; u++)
21408 + INIT_HLIST_HEAD(head++);
21409 + return 0; /* success */
21415 +static void nhash_count(struct hlist_head *head)
21419 + struct hlist_node *pos;
21422 + hlist_for_each(pos, head)
21424 + AuInfo("%lu\n", n);
21428 +static void au_nhash_wh_do_free(struct hlist_head *head)
21430 + struct au_vdir_wh *tpos;
21431 + struct hlist_node *pos, *node;
21433 + hlist_for_each_entry_safe(tpos, pos, node, head, wh_hash) {
21434 + /* hlist_del(pos); */
21439 +static void au_nhash_de_do_free(struct hlist_head *head)
21441 + struct au_vdir_dehstr *tpos;
21442 + struct hlist_node *pos, *node;
21444 + hlist_for_each_entry_safe(tpos, pos, node, head, hash) {
21445 + /* hlist_del(pos); */
21446 + au_cache_free_vdir_dehstr(tpos);
21450 +static void au_nhash_do_free(struct au_nhash *nhash,
21451 + void (*free)(struct hlist_head *head))
21454 + struct hlist_head *head;
21456 + n = nhash->nh_num;
21460 + head = nhash->nh_head;
21461 + while (n-- > 0) {
21462 + nhash_count(head);
21465 + kfree(nhash->nh_head);
21468 +void au_nhash_wh_free(struct au_nhash *whlist)
21470 + au_nhash_do_free(whlist, au_nhash_wh_do_free);
21473 +static void au_nhash_de_free(struct au_nhash *delist)
21475 + au_nhash_do_free(delist, au_nhash_de_do_free);
21478 +/* ---------------------------------------------------------------------- */
21480 +int au_nhash_test_longer_wh(struct au_nhash *whlist, aufs_bindex_t btgt,
21484 + unsigned int u, n;
21485 + struct hlist_head *head;
21486 + struct au_vdir_wh *tpos;
21487 + struct hlist_node *pos;
21490 + n = whlist->nh_num;
21491 + head = whlist->nh_head;
21492 + for (u = 0; u < n; u++, head++)
21493 + hlist_for_each_entry(tpos, pos, head, wh_hash)
21494 + if (tpos->wh_bindex == btgt && ++num > limit)
21499 +static struct hlist_head *au_name_hash(struct au_nhash *nhash,
21500 + unsigned char *name,
21501 + unsigned int len)
21504 + /* const unsigned int magic_bit = 12; */
21506 + AuDebugOn(!nhash->nh_num || !nhash->nh_head);
21511 + /* v = hash_long(v, magic_bit); */
21512 + v %= nhash->nh_num;
21513 + return nhash->nh_head + v;
21516 +static int au_nhash_test_name(struct au_vdir_destr *str, const char *name,
21519 + return str->len == nlen && !memcmp(str->name, name, nlen);
21522 +/* returns found or not */
21523 +int au_nhash_test_known_wh(struct au_nhash *whlist, char *name, int nlen)
21525 + struct hlist_head *head;
21526 + struct au_vdir_wh *tpos;
21527 + struct hlist_node *pos;
21528 + struct au_vdir_destr *str;
21530 + head = au_name_hash(whlist, name, nlen);
21531 + hlist_for_each_entry(tpos, pos, head, wh_hash) {
21532 + str = &tpos->wh_str;
21533 + AuDbg("%.*s\n", str->len, str->name);
21534 + if (au_nhash_test_name(str, name, nlen))
21540 +/* returns found(true) or not */
21541 +static int test_known(struct au_nhash *delist, char *name, int nlen)
21543 + struct hlist_head *head;
21544 + struct au_vdir_dehstr *tpos;
21545 + struct hlist_node *pos;
21546 + struct au_vdir_destr *str;
21548 + head = au_name_hash(delist, name, nlen);
21549 + hlist_for_each_entry(tpos, pos, head, hash) {
21551 + AuDbg("%.*s\n", str->len, str->name);
21552 + if (au_nhash_test_name(str, name, nlen))
21558 +static void au_shwh_init_wh(struct au_vdir_wh *wh, ino_t ino,
21559 + unsigned char d_type)
21561 +#ifdef CONFIG_AUFS_SHWH
21562 + wh->wh_ino = ino;
21563 + wh->wh_type = d_type;
21567 +/* ---------------------------------------------------------------------- */
21569 +int au_nhash_append_wh(struct au_nhash *whlist, char *name, int nlen, ino_t ino,
21570 + unsigned int d_type, aufs_bindex_t bindex,
21571 + unsigned char shwh)
21574 + struct au_vdir_destr *str;
21575 + struct au_vdir_wh *wh;
21577 + AuDbg("%.*s\n", nlen, name);
21578 + AuDebugOn(!whlist->nh_num || !whlist->nh_head);
21581 + wh = kmalloc(sizeof(*wh) + nlen, GFP_NOFS);
21582 + if (unlikely(!wh))
21586 + wh->wh_bindex = bindex;
21588 + au_shwh_init_wh(wh, ino, d_type);
21589 + str = &wh->wh_str;
21591 + memcpy(str->name, name, nlen);
21592 + hlist_add_head(&wh->wh_hash, au_name_hash(whlist, name, nlen));
21599 +static int append_deblk(struct au_vdir *vdir)
21602 + unsigned long ul;
21603 + const unsigned int deblk_sz = vdir->vd_deblk_sz;
21604 + union au_vdir_deblk_p p, deblk_end;
21605 + unsigned char **o;
21608 + o = krealloc(vdir->vd_deblk, sizeof(*o) * (vdir->vd_nblk + 1),
21610 + if (unlikely(!o))
21613 + vdir->vd_deblk = o;
21614 + p.deblk = kmalloc(deblk_sz, GFP_NOFS);
21616 + ul = vdir->vd_nblk++;
21617 + vdir->vd_deblk[ul] = p.deblk;
21618 + vdir->vd_last.ul = ul;
21619 + vdir->vd_last.p.deblk = p.deblk;
21620 + deblk_end.deblk = p.deblk + deblk_sz;
21621 + err = set_deblk_end(&p, &deblk_end);
21628 +static int append_de(struct au_vdir *vdir, char *name, int nlen, ino_t ino,
21629 + unsigned int d_type, struct au_nhash *delist)
21633 + const unsigned int deblk_sz = vdir->vd_deblk_sz;
21634 + union au_vdir_deblk_p p, *room, deblk_end;
21635 + struct au_vdir_dehstr *dehstr;
21637 + p.deblk = last_deblk(vdir);
21638 + deblk_end.deblk = p.deblk + deblk_sz;
21639 + room = &vdir->vd_last.p;
21640 + AuDebugOn(room->deblk < p.deblk || deblk_end.deblk <= room->deblk
21641 + || !is_deblk_end(room, &deblk_end));
21643 + sz = calc_size(nlen);
21644 + if (unlikely(sz > deblk_end.deblk - room->deblk)) {
21645 + err = append_deblk(vdir);
21646 + if (unlikely(err))
21649 + p.deblk = last_deblk(vdir);
21650 + deblk_end.deblk = p.deblk + deblk_sz;
21652 + AuDebugOn(room->deblk != p.deblk);
21656 + dehstr = au_cache_alloc_vdir_dehstr();
21657 + if (unlikely(!dehstr))
21660 + dehstr->str = &room->de->de_str;
21661 + hlist_add_head(&dehstr->hash, au_name_hash(delist, name, nlen));
21662 + room->de->de_ino = ino;
21663 + room->de->de_type = d_type;
21664 + room->de->de_str.len = nlen;
21665 + memcpy(room->de->de_str.name, name, nlen);
21668 + room->deblk += sz;
21669 + if (unlikely(set_deblk_end(room, &deblk_end)))
21670 + err = append_deblk(vdir);
21677 +/* ---------------------------------------------------------------------- */
21679 +void au_vdir_free(struct au_vdir *vdir)
21681 + unsigned char **deblk;
21683 + deblk = vdir->vd_deblk;
21684 + while (vdir->vd_nblk--)
21686 + kfree(vdir->vd_deblk);
21687 + au_cache_free_vdir(vdir);
21690 +static struct au_vdir *alloc_vdir(struct file *file)
21692 + struct au_vdir *vdir;
21693 + struct super_block *sb;
21696 + sb = file->f_dentry->d_sb;
21697 + SiMustAnyLock(sb);
21700 + vdir = au_cache_alloc_vdir();
21701 + if (unlikely(!vdir))
21704 + vdir->vd_deblk = kzalloc(sizeof(*vdir->vd_deblk), GFP_NOFS);
21705 + if (unlikely(!vdir->vd_deblk))
21708 + vdir->vd_deblk_sz = au_sbi(sb)->si_rdblk;
21709 + if (!vdir->vd_deblk_sz) {
21710 + /* estimate the apropriate size for deblk */
21711 + vdir->vd_deblk_sz = au_dir_size(file, /*dentry*/NULL);
21712 + /* AuInfo("vd_deblk_sz %u\n", vdir->vd_deblk_sz); */
21714 + vdir->vd_nblk = 0;
21715 + vdir->vd_version = 0;
21716 + vdir->vd_jiffy = 0;
21717 + err = append_deblk(vdir);
21719 + return vdir; /* success */
21721 + kfree(vdir->vd_deblk);
21724 + au_cache_free_vdir(vdir);
21726 + vdir = ERR_PTR(err);
21730 +static int reinit_vdir(struct au_vdir *vdir)
21733 + union au_vdir_deblk_p p, deblk_end;
21735 + while (vdir->vd_nblk > 1) {
21736 + kfree(vdir->vd_deblk[vdir->vd_nblk - 1]);
21737 + /* vdir->vd_deblk[vdir->vd_nblk - 1] = NULL; */
21740 + p.deblk = vdir->vd_deblk[0];
21741 + deblk_end.deblk = p.deblk + vdir->vd_deblk_sz;
21742 + err = set_deblk_end(&p, &deblk_end);
21743 + /* keep vd_dblk_sz */
21744 + vdir->vd_last.ul = 0;
21745 + vdir->vd_last.p.deblk = vdir->vd_deblk[0];
21746 + vdir->vd_version = 0;
21747 + vdir->vd_jiffy = 0;
21752 +/* ---------------------------------------------------------------------- */
21754 +#define AuFillVdir_CALLED 1
21755 +#define AuFillVdir_WHABLE (1 << 1)
21756 +#define AuFillVdir_SHWH (1 << 2)
21757 +#define au_ftest_fillvdir(flags, name) ((flags) & AuFillVdir_##name)
21758 +#define au_fset_fillvdir(flags, name) { (flags) |= AuFillVdir_##name; }
21759 +#define au_fclr_fillvdir(flags, name) { (flags) &= ~AuFillVdir_##name; }
21761 +#ifndef CONFIG_AUFS_SHWH
21762 +#undef AuFillVdir_SHWH
21763 +#define AuFillVdir_SHWH 0
21766 +struct fillvdir_arg {
21767 + struct file *file;
21768 + struct au_vdir *vdir;
21769 + struct au_nhash delist;
21770 + struct au_nhash whlist;
21771 + aufs_bindex_t bindex;
21772 + unsigned int flags;
21776 +static int fillvdir(void *__arg, const char *__name, int nlen,
21777 + loff_t offset __maybe_unused, u64 h_ino,
21778 + unsigned int d_type)
21780 + struct fillvdir_arg *arg = __arg;
21781 + char *name = (void *)__name;
21782 + struct super_block *sb;
21784 + const unsigned char shwh = !!au_ftest_fillvdir(arg->flags, SHWH);
21787 + sb = arg->file->f_dentry->d_sb;
21788 + au_fset_fillvdir(arg->flags, CALLED);
21790 + if (nlen <= AUFS_WH_PFX_LEN
21791 + || memcmp(name, AUFS_WH_PFX, AUFS_WH_PFX_LEN)) {
21792 + if (test_known(&arg->delist, name, nlen)
21793 + || au_nhash_test_known_wh(&arg->whlist, name, nlen))
21794 + goto out; /* already exists or whiteouted */
21796 + sb = arg->file->f_dentry->d_sb;
21797 + arg->err = au_ino(sb, arg->bindex, h_ino, d_type, &ino);
21799 + if (unlikely(nlen > AUFS_MAX_NAMELEN))
21800 + d_type = DT_UNKNOWN;
21801 + arg->err = append_de(arg->vdir, name, nlen, ino,
21802 + d_type, &arg->delist);
21804 + } else if (au_ftest_fillvdir(arg->flags, WHABLE)) {
21805 + name += AUFS_WH_PFX_LEN;
21806 + nlen -= AUFS_WH_PFX_LEN;
21807 + if (au_nhash_test_known_wh(&arg->whlist, name, nlen))
21808 + goto out; /* already whiteouted */
21811 + arg->err = au_wh_ino(sb, arg->bindex, h_ino, d_type,
21814 + if (nlen <= AUFS_MAX_NAMELEN + AUFS_WH_PFX_LEN)
21815 + d_type = DT_UNKNOWN;
21816 + arg->err = au_nhash_append_wh
21817 + (&arg->whlist, name, nlen, ino, d_type,
21818 + arg->bindex, shwh);
21824 + arg->vdir->vd_jiffy = jiffies;
21826 + AuTraceErr(arg->err);
21830 +static int au_handle_shwh(struct super_block *sb, struct au_vdir *vdir,
21831 + struct au_nhash *whlist, struct au_nhash *delist)
21833 +#ifdef CONFIG_AUFS_SHWH
21835 + unsigned int nh, u;
21836 + struct hlist_head *head;
21837 + struct au_vdir_wh *tpos;
21838 + struct hlist_node *pos, *n;
21840 + struct au_vdir_destr *destr;
21842 + AuDebugOn(!au_opt_test(au_mntflags(sb), SHWH));
21845 + o = p = __getname();
21846 + if (unlikely(!p))
21850 + nh = whlist->nh_num;
21851 + memcpy(p, AUFS_WH_PFX, AUFS_WH_PFX_LEN);
21852 + p += AUFS_WH_PFX_LEN;
21853 + for (u = 0; u < nh; u++) {
21854 + head = whlist->nh_head + u;
21855 + hlist_for_each_entry_safe(tpos, pos, n, head, wh_hash) {
21856 + destr = &tpos->wh_str;
21857 + memcpy(p, destr->name, destr->len);
21858 + err = append_de(vdir, o, destr->len + AUFS_WH_PFX_LEN,
21859 + tpos->wh_ino, tpos->wh_type, delist);
21860 + if (unlikely(err))
21875 +static int au_do_read_vdir(struct fillvdir_arg *arg)
21878 + unsigned int rdhash;
21880 + aufs_bindex_t bend, bindex, bstart;
21881 + unsigned char shwh;
21882 + struct file *hf, *file;
21883 + struct super_block *sb;
21885 + file = arg->file;
21886 + sb = file->f_dentry->d_sb;
21887 + SiMustAnyLock(sb);
21889 + rdhash = au_sbi(sb)->si_rdhash;
21891 + rdhash = au_rdhash_est(au_dir_size(file, /*dentry*/NULL));
21892 + err = au_nhash_alloc(&arg->delist, rdhash, GFP_NOFS);
21893 + if (unlikely(err))
21895 + err = au_nhash_alloc(&arg->whlist, rdhash, GFP_NOFS);
21896 + if (unlikely(err))
21902 + if (au_opt_test(au_mntflags(sb), SHWH)) {
21904 + au_fset_fillvdir(arg->flags, SHWH);
21906 + bstart = au_fbstart(file);
21907 + bend = au_fbend(file);
21908 + for (bindex = bstart; !err && bindex <= bend; bindex++) {
21909 + hf = au_h_fptr(file, bindex);
21913 + offset = vfsub_llseek(hf, 0, SEEK_SET);
21915 + if (unlikely(offset))
21918 + arg->bindex = bindex;
21919 + au_fclr_fillvdir(arg->flags, WHABLE);
21921 + || (bindex != bend
21922 + && au_br_whable(au_sbr_perm(sb, bindex))))
21923 + au_fset_fillvdir(arg->flags, WHABLE);
21926 + au_fclr_fillvdir(arg->flags, CALLED);
21928 + err = vfsub_readdir(hf, fillvdir, arg);
21931 + } while (!err && au_ftest_fillvdir(arg->flags, CALLED));
21934 + if (!err && shwh)
21935 + err = au_handle_shwh(sb, arg->vdir, &arg->whlist, &arg->delist);
21937 + au_nhash_wh_free(&arg->whlist);
21940 + au_nhash_de_free(&arg->delist);
21945 +static int read_vdir(struct file *file, int may_read)
21948 + unsigned long expire;
21949 + unsigned char do_read;
21950 + struct fillvdir_arg arg;
21951 + struct inode *inode;
21952 + struct au_vdir *vdir, *allocated;
21955 + inode = file->f_dentry->d_inode;
21956 + IMustLock(inode);
21957 + SiMustAnyLock(inode->i_sb);
21959 + allocated = NULL;
21961 + expire = au_sbi(inode->i_sb)->si_rdcache;
21962 + vdir = au_ivdir(inode);
21965 + vdir = alloc_vdir(file);
21966 + err = PTR_ERR(vdir);
21967 + if (IS_ERR(vdir))
21970 + allocated = vdir;
21971 + } else if (may_read
21972 + && (inode->i_version != vdir->vd_version
21973 + || time_after(jiffies, vdir->vd_jiffy + expire))) {
21975 + err = reinit_vdir(vdir);
21976 + if (unlikely(err))
21981 + return 0; /* success */
21985 + err = au_do_read_vdir(&arg);
21987 + /* file->f_pos = 0; */
21988 + vdir->vd_version = inode->i_version;
21989 + vdir->vd_last.ul = 0;
21990 + vdir->vd_last.p.deblk = vdir->vd_deblk[0];
21992 + au_set_ivdir(inode, allocated);
21993 + } else if (allocated)
21994 + au_vdir_free(allocated);
22000 +static int copy_vdir(struct au_vdir *tgt, struct au_vdir *src)
22003 + unsigned long ul, n;
22004 + const unsigned int deblk_sz = src->vd_deblk_sz;
22006 + AuDebugOn(tgt->vd_nblk != 1);
22009 + if (tgt->vd_nblk < src->vd_nblk) {
22010 + unsigned char **p;
22012 + p = krealloc(tgt->vd_deblk, sizeof(*p) * src->vd_nblk,
22014 + if (unlikely(!p))
22016 + tgt->vd_deblk = p;
22019 + if (tgt->vd_deblk_sz != deblk_sz) {
22020 + unsigned char *p;
22022 + tgt->vd_deblk_sz = deblk_sz;
22023 + p = krealloc(tgt->vd_deblk[0], deblk_sz, GFP_NOFS);
22024 + if (unlikely(!p))
22026 + tgt->vd_deblk[0] = p;
22028 + memcpy(tgt->vd_deblk[0], src->vd_deblk[0], deblk_sz);
22029 + tgt->vd_version = src->vd_version;
22030 + tgt->vd_jiffy = src->vd_jiffy;
22032 + n = src->vd_nblk;
22033 + for (ul = 1; ul < n; ul++) {
22034 + tgt->vd_deblk[ul] = kmemdup(src->vd_deblk[ul], deblk_sz,
22036 + if (unlikely(!tgt->vd_deblk[ul]))
22040 + tgt->vd_nblk = n;
22041 + tgt->vd_last.ul = tgt->vd_last.ul;
22042 + tgt->vd_last.p.deblk = tgt->vd_deblk[tgt->vd_last.ul];
22043 + tgt->vd_last.p.deblk += src->vd_last.p.deblk
22044 + - src->vd_deblk[src->vd_last.ul];
22046 + return 0; /* success */
22049 + rerr = reinit_vdir(tgt);
22054 +int au_vdir_init(struct file *file)
22057 + struct inode *inode;
22058 + struct au_vdir *vdir_cache, *allocated;
22060 + err = read_vdir(file, !file->f_pos);
22061 + if (unlikely(err))
22064 + allocated = NULL;
22065 + vdir_cache = au_fvdir_cache(file);
22066 + if (!vdir_cache) {
22067 + vdir_cache = alloc_vdir(file);
22068 + err = PTR_ERR(vdir_cache);
22069 + if (IS_ERR(vdir_cache))
22071 + allocated = vdir_cache;
22072 + } else if (!file->f_pos && vdir_cache->vd_version != file->f_version) {
22073 + err = reinit_vdir(vdir_cache);
22074 + if (unlikely(err))
22077 + return 0; /* success */
22079 + inode = file->f_dentry->d_inode;
22080 + err = copy_vdir(vdir_cache, au_ivdir(inode));
22082 + file->f_version = inode->i_version;
22084 + au_set_fvdir_cache(file, allocated);
22085 + } else if (allocated)
22086 + au_vdir_free(allocated);
22092 +static loff_t calc_offset(struct au_vdir *vdir)
22095 + union au_vdir_deblk_p p;
22097 + p.deblk = vdir->vd_deblk[vdir->vd_last.ul];
22098 + offset = vdir->vd_last.p.deblk - p.deblk;
22099 + offset += vdir->vd_deblk_sz * vdir->vd_last.ul;
22103 +/* returns true or false */
22104 +static int seek_vdir(struct file *file)
22107 + unsigned int deblk_sz;
22108 + unsigned long ul, n;
22110 + union au_vdir_deblk_p p, deblk_end;
22111 + struct au_vdir *vdir_cache;
22114 + vdir_cache = au_fvdir_cache(file);
22115 + offset = calc_offset(vdir_cache);
22116 + AuDbg("offset %lld\n", offset);
22117 + if (file->f_pos == offset)
22120 + vdir_cache->vd_last.ul = 0;
22121 + vdir_cache->vd_last.p.deblk = vdir_cache->vd_deblk[0];
22122 + if (!file->f_pos)
22126 + deblk_sz = vdir_cache->vd_deblk_sz;
22127 + ul = div64_u64(file->f_pos, deblk_sz);
22128 + AuDbg("ul %lu\n", ul);
22129 + if (ul >= vdir_cache->vd_nblk)
22132 + n = vdir_cache->vd_nblk;
22133 + for (; ul < n; ul++) {
22134 + p.deblk = vdir_cache->vd_deblk[ul];
22135 + deblk_end.deblk = p.deblk + deblk_sz;
22137 + offset *= deblk_sz;
22138 + while (!is_deblk_end(&p, &deblk_end) && offset < file->f_pos) {
22141 + l = calc_size(p.de->de_str.len);
22145 + if (!is_deblk_end(&p, &deblk_end)) {
22147 + vdir_cache->vd_last.ul = ul;
22148 + vdir_cache->vd_last.p = p;
22155 + AuTraceErr(!valid);
22159 +int au_vdir_fill_de(struct file *file, void *dirent, filldir_t filldir)
22162 + unsigned int l, deblk_sz;
22163 + union au_vdir_deblk_p deblk_end;
22164 + struct au_vdir *vdir_cache;
22165 + struct au_vdir_de *de;
22167 + vdir_cache = au_fvdir_cache(file);
22168 + if (!seek_vdir(file))
22171 + deblk_sz = vdir_cache->vd_deblk_sz;
22173 + deblk_end.deblk = vdir_cache->vd_deblk[vdir_cache->vd_last.ul];
22174 + deblk_end.deblk += deblk_sz;
22175 + while (!is_deblk_end(&vdir_cache->vd_last.p, &deblk_end)) {
22176 + de = vdir_cache->vd_last.p.de;
22177 + AuDbg("%.*s, off%lld, i%lu, dt%d\n",
22178 + de->de_str.len, de->de_str.name, file->f_pos,
22179 + (unsigned long)de->de_ino, de->de_type);
22180 + err = filldir(dirent, de->de_str.name, de->de_str.len,
22181 + file->f_pos, de->de_ino, de->de_type);
22182 + if (unlikely(err)) {
22184 + /* todo: ignore the error caused by udba? */
22185 + /* return err; */
22189 + l = calc_size(de->de_str.len);
22190 + vdir_cache->vd_last.p.deblk += l;
22191 + file->f_pos += l;
22193 + if (vdir_cache->vd_last.ul < vdir_cache->vd_nblk - 1) {
22194 + vdir_cache->vd_last.ul++;
22195 + vdir_cache->vd_last.p.deblk
22196 + = vdir_cache->vd_deblk[vdir_cache->vd_last.ul];
22197 + file->f_pos = deblk_sz * vdir_cache->vd_last.ul;
22206 diff --git a/fs/aufs/vfsub.c b/fs/aufs/vfsub.c
22207 new file mode 100644
22208 index 0000000..51f2848
22210 +++ b/fs/aufs/vfsub.c
22213 + * Copyright (C) 2005-2009 Junjiro R. Okajima
22215 + * This program, aufs is free software; you can redistribute it and/or modify
22216 + * it under the terms of the GNU General Public License as published by
22217 + * the Free Software Foundation; either version 2 of the License, or
22218 + * (at your option) any later version.
22220 + * This program is distributed in the hope that it will be useful,
22221 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
22222 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
22223 + * GNU General Public License for more details.
22225 + * You should have received a copy of the GNU General Public License
22226 + * along with this program; if not, write to the Free Software
22227 + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
22231 + * sub-routines for VFS
22234 +#include <linux/namei.h>
22235 +#include <linux/splice.h>
22236 +#include <linux/uaccess.h>
22239 +int vfsub_update_h_iattr(struct path *h_path, int *did)
22243 + struct super_block *h_sb;
22245 + /* for remote fs, leave work for its getattr or d_revalidate */
22246 + /* for bad i_attr fs, handle them in aufs_getattr() */
22247 + /* still some fs may acquire i_mutex. we need to skip them */
22251 + h_sb = h_path->dentry->d_sb;
22252 + *did = (!au_test_fs_remote(h_sb) && au_test_fs_refresh_iattr(h_sb));
22254 + err = vfs_getattr(h_path->mnt, h_path->dentry, &st);
22259 +/* ---------------------------------------------------------------------- */
22261 +struct file *vfsub_filp_open(const char *path, int oflags, int mode)
22263 + struct file *file;
22266 + file = filp_open(path, oflags, mode);
22268 + if (IS_ERR(file))
22270 + vfsub_update_h_iattr(&file->f_path, /*did*/NULL); /*ignore*/
22276 +int vfsub_path_lookup(const char *name, unsigned int flags,
22277 + struct nameidata *nd)
22281 + /* lockdep_off(); */
22282 + err = path_lookup(name, flags, nd);
22283 + /* lockdep_on(); */
22284 + if (!err && nd->path.dentry->d_inode)
22285 + vfsub_update_h_iattr(&nd->path, /*did*/NULL); /*ignore*/
22289 +struct dentry *vfsub_lookup_one_len(const char *name, struct dentry *parent,
22292 + struct path path = {
22296 + IMustLock(parent->d_inode);
22298 + path.dentry = lookup_one_len(name, parent, len);
22299 + if (IS_ERR(path.dentry))
22301 + if (path.dentry->d_inode)
22302 + vfsub_update_h_iattr(&path, /*did*/NULL); /*ignore*/
22305 + AuTraceErrPtr(path.dentry);
22306 + return path.dentry;
22309 +struct dentry *vfsub_lookup_hash(struct nameidata *nd)
22311 + struct path path = {
22312 + .mnt = nd->path.mnt
22315 + IMustLock(nd->path.dentry->d_inode);
22317 + path.dentry = lookup_hash(nd);
22318 + if (!IS_ERR(path.dentry) && path.dentry->d_inode)
22319 + vfsub_update_h_iattr(&path, /*did*/NULL); /*ignore*/
22321 + AuTraceErrPtr(path.dentry);
22322 + return path.dentry;
22325 +/* ---------------------------------------------------------------------- */
22327 +struct dentry *vfsub_lock_rename(struct dentry *d1, struct au_hinode *hdir1,
22328 + struct dentry *d2, struct au_hinode *hdir2)
22330 + struct dentry *d;
22333 + d = lock_rename(d1, d2);
22335 + au_hin_suspend(hdir1);
22336 + if (hdir1 != hdir2)
22337 + au_hin_suspend(hdir2);
22342 +void vfsub_unlock_rename(struct dentry *d1, struct au_hinode *hdir1,
22343 + struct dentry *d2, struct au_hinode *hdir2)
22345 + au_hin_resume(hdir1);
22346 + if (hdir1 != hdir2)
22347 + au_hin_resume(hdir2);
22349 + unlock_rename(d1, d2);
22353 +/* ---------------------------------------------------------------------- */
22355 +int vfsub_create(struct inode *dir, struct path *path, int mode)
22361 + if (au_test_fs_null_nd(dir->i_sb))
22362 + err = vfs_create(dir, path->dentry, mode, NULL);
22364 + struct nameidata h_nd;
22366 + memset(&h_nd, 0, sizeof(h_nd));
22367 + h_nd.flags = LOOKUP_CREATE;
22368 + h_nd.intent.open.flags = O_CREAT | FMODE_READ;
22369 + h_nd.intent.open.create_mode = mode;
22370 + h_nd.path.dentry = path->dentry->d_parent;
22371 + h_nd.path.mnt = path->mnt;
22372 + path_get(&h_nd.path);
22373 + err = vfs_create(dir, path->dentry, mode, &h_nd);
22374 + path_put(&h_nd.path);
22378 + struct path tmp = *path;
22381 + vfsub_update_h_iattr(&tmp, &did);
22383 + tmp.dentry = path->dentry->d_parent;
22384 + vfsub_update_h_iattr(&tmp, /*did*/NULL);
22392 +int vfsub_symlink(struct inode *dir, struct path *path, const char *symname)
22398 + err = vfs_symlink(dir, path->dentry, symname);
22400 + struct path tmp = *path;
22403 + vfsub_update_h_iattr(&tmp, &did);
22405 + tmp.dentry = path->dentry->d_parent;
22406 + vfsub_update_h_iattr(&tmp, /*did*/NULL);
22413 +int vfsub_mknod(struct inode *dir, struct path *path, int mode, dev_t dev)
22419 + err = vfs_mknod(dir, path->dentry, mode, dev);
22421 + struct path tmp = *path;
22424 + vfsub_update_h_iattr(&tmp, &did);
22426 + tmp.dentry = path->dentry->d_parent;
22427 + vfsub_update_h_iattr(&tmp, /*did*/NULL);
22434 +static int au_test_nlink(struct inode *inode)
22436 + const unsigned int link_max = UINT_MAX >> 1; /* rough margin */
22438 + if (!au_test_fs_no_limit_nlink(inode->i_sb)
22439 + || inode->i_nlink < link_max)
22444 +int vfsub_link(struct dentry *src_dentry, struct inode *dir, struct path *path)
22450 + err = au_test_nlink(src_dentry->d_inode);
22451 + if (unlikely(err))
22455 + err = vfs_link(src_dentry, dir, path->dentry);
22458 + struct path tmp = *path;
22461 + /* fuse has different memory inode for the same inumber */
22462 + vfsub_update_h_iattr(&tmp, &did);
22464 + tmp.dentry = path->dentry->d_parent;
22465 + vfsub_update_h_iattr(&tmp, /*did*/NULL);
22466 + tmp.dentry = src_dentry;
22467 + vfsub_update_h_iattr(&tmp, /*did*/NULL);
22474 +int vfsub_rename(struct inode *src_dir, struct dentry *src_dentry,
22475 + struct inode *dir, struct path *path)
22478 + struct path tmp = {
22479 + .dentry = path->dentry->d_parent,
22484 + IMustLock(src_dir);
22487 + err = vfs_rename(src_dir, src_dentry, dir, path->dentry);
22492 + vfsub_update_h_iattr(&tmp, &did);
22494 + tmp.dentry = src_dentry;
22495 + vfsub_update_h_iattr(&tmp, /*did*/NULL);
22496 + tmp.dentry = src_dentry->d_parent;
22497 + vfsub_update_h_iattr(&tmp, /*did*/NULL);
22504 +int vfsub_mkdir(struct inode *dir, struct path *path, int mode)
22510 + err = vfs_mkdir(dir, path->dentry, mode);
22512 + struct path tmp = *path;
22515 + vfsub_update_h_iattr(&tmp, &did);
22517 + tmp.dentry = path->dentry->d_parent;
22518 + vfsub_update_h_iattr(&tmp, /*did*/NULL);
22525 +int vfsub_rmdir(struct inode *dir, struct path *path)
22532 + err = vfs_rmdir(dir, path->dentry);
22535 + struct path tmp = {
22536 + .dentry = path->dentry->d_parent,
22540 + vfsub_update_h_iattr(&tmp, /*did*/NULL); /*ignore*/
22546 +/* ---------------------------------------------------------------------- */
22548 +ssize_t vfsub_read_u(struct file *file, char __user *ubuf, size_t count,
22553 + err = vfs_read(file, ubuf, count, ppos);
22555 + vfsub_update_h_iattr(&file->f_path, /*did*/NULL); /*ignore*/
22559 +/* todo: kernel_read()? */
22560 +ssize_t vfsub_read_k(struct file *file, void *kbuf, size_t count,
22564 + mm_segment_t oldfs;
22566 + oldfs = get_fs();
22567 + set_fs(KERNEL_DS);
22568 + err = vfsub_read_u(file, (char __user *)kbuf, count, ppos);
22573 +ssize_t vfsub_write_u(struct file *file, const char __user *ubuf, size_t count,
22579 + err = vfs_write(file, ubuf, count, ppos);
22582 + vfsub_update_h_iattr(&file->f_path, /*did*/NULL); /*ignore*/
22586 +ssize_t vfsub_write_k(struct file *file, void *kbuf, size_t count, loff_t *ppos)
22589 + mm_segment_t oldfs;
22591 + oldfs = get_fs();
22592 + set_fs(KERNEL_DS);
22593 + err = vfsub_write_u(file, (const char __user *)kbuf, count, ppos);
22598 +int vfsub_readdir(struct file *file, filldir_t filldir, void *arg)
22603 + err = vfs_readdir(file, filldir, arg);
22606 + vfsub_update_h_iattr(&file->f_path, /*did*/NULL); /*ignore*/
22610 +long vfsub_splice_to(struct file *in, loff_t *ppos,
22611 + struct pipe_inode_info *pipe, size_t len,
22612 + unsigned int flags)
22617 + err = do_splice_to(in, ppos, pipe, len, flags);
22620 + vfsub_update_h_iattr(&in->f_path, /*did*/NULL); /*ignore*/
22624 +long vfsub_splice_from(struct pipe_inode_info *pipe, struct file *out,
22625 + loff_t *ppos, size_t len, unsigned int flags)
22630 + err = do_splice_from(pipe, out, ppos, len, flags);
22633 + vfsub_update_h_iattr(&out->f_path, /*did*/NULL); /*ignore*/
22637 +/* cf. open.c:do_sys_truncate() and do_sys_ftruncate() */
22638 +int vfsub_trunc(struct path *h_path, loff_t length, unsigned int attr,
22639 + struct file *h_file)
22642 + struct inode *h_inode;
22644 + h_inode = h_path->dentry->d_inode;
22646 + err = mnt_want_write(h_path->mnt);
22649 + err = inode_permission(h_inode, MAY_WRITE);
22652 + err = get_write_access(h_inode);
22655 + err = break_lease(h_inode, FMODE_WRITE);
22660 + err = locks_verify_truncate(h_inode, h_file, length);
22663 + err = do_truncate(h_path->dentry, length, attr, h_file);
22669 + put_write_access(h_inode);
22672 + mnt_drop_write(h_path->mnt);
22677 +/* ---------------------------------------------------------------------- */
22679 +struct au_vfsub_mkdir_args {
22681 + struct inode *dir;
22682 + struct path *path;
22686 +static void au_call_vfsub_mkdir(void *args)
22688 + struct au_vfsub_mkdir_args *a = args;
22689 + *a->errp = vfsub_mkdir(a->dir, a->path, a->mode);
22692 +int vfsub_sio_mkdir(struct inode *dir, struct path *path, int mode)
22694 + int err, do_sio, wkq_err;
22696 + do_sio = au_test_h_perm_sio(dir, MAY_EXEC | MAY_WRITE);
22698 + err = vfsub_mkdir(dir, path, mode);
22700 + struct au_vfsub_mkdir_args args = {
22706 + wkq_err = au_wkq_wait(au_call_vfsub_mkdir, &args);
22707 + if (unlikely(wkq_err))
22714 +struct au_vfsub_rmdir_args {
22716 + struct inode *dir;
22717 + struct path *path;
22720 +static void au_call_vfsub_rmdir(void *args)
22722 + struct au_vfsub_rmdir_args *a = args;
22723 + *a->errp = vfsub_rmdir(a->dir, a->path);
22726 +int vfsub_sio_rmdir(struct inode *dir, struct path *path)
22728 + int err, do_sio, wkq_err;
22730 + do_sio = au_test_h_perm_sio(dir, MAY_EXEC | MAY_WRITE);
22732 + err = vfsub_rmdir(dir, path);
22734 + struct au_vfsub_rmdir_args args = {
22739 + wkq_err = au_wkq_wait(au_call_vfsub_rmdir, &args);
22740 + if (unlikely(wkq_err))
22747 +/* ---------------------------------------------------------------------- */
22749 +struct notify_change_args {
22751 + struct path *path;
22752 + struct iattr *ia;
22755 +static void call_notify_change(void *args)
22757 + struct notify_change_args *a = args;
22758 + struct inode *h_inode;
22760 + h_inode = a->path->dentry->d_inode;
22761 + IMustLock(h_inode);
22763 + *a->errp = -EPERM;
22764 + if (!IS_IMMUTABLE(h_inode) && !IS_APPEND(h_inode)) {
22766 + *a->errp = notify_change(a->path->dentry, a->ia);
22769 + vfsub_update_h_iattr(a->path, /*did*/NULL); /*ignore*/
22771 + AuTraceErr(*a->errp);
22774 +int vfsub_notify_change(struct path *path, struct iattr *ia)
22777 + struct notify_change_args args = {
22783 + call_notify_change(&args);
22788 +int vfsub_sio_notify_change(struct path *path, struct iattr *ia)
22790 + int err, wkq_err;
22791 + struct notify_change_args args = {
22797 + wkq_err = au_wkq_wait(call_notify_change, &args);
22798 + if (unlikely(wkq_err))
22804 +/* ---------------------------------------------------------------------- */
22806 +struct unlink_args {
22808 + struct inode *dir;
22809 + struct path *path;
22812 +static void call_unlink(void *args)
22814 + struct unlink_args *a = args;
22815 + struct dentry *d = a->path->dentry;
22816 + struct inode *h_inode;
22817 + const int stop_sillyrename = (au_test_nfs(d->d_sb)
22818 + && atomic_read(&d->d_count) == 1);
22820 + IMustLock(a->dir);
22822 + if (!stop_sillyrename)
22824 + h_inode = d->d_inode;
22826 + atomic_inc(&h_inode->i_count);
22829 + *a->errp = vfs_unlink(a->dir, d);
22832 + struct path tmp = {
22833 + .dentry = d->d_parent,
22834 + .mnt = a->path->mnt
22836 + vfsub_update_h_iattr(&tmp, /*did*/NULL); /*ignore*/
22839 + if (!stop_sillyrename)
22844 + AuTraceErr(*a->errp);
22848 + * @dir: must be locked.
22849 + * @dentry: target dentry.
22851 +int vfsub_unlink(struct inode *dir, struct path *path, int force)
22854 + struct unlink_args args = {
22861 + call_unlink(&args);
22865 + wkq_err = au_wkq_wait(call_unlink, &args);
22866 + if (unlikely(wkq_err))
22872 diff --git a/fs/aufs/vfsub.h b/fs/aufs/vfsub.h
22873 new file mode 100644
22874 index 0000000..a131d98
22876 +++ b/fs/aufs/vfsub.h
22879 + * Copyright (C) 2005-2009 Junjiro R. Okajima
22881 + * This program, aufs is free software; you can redistribute it and/or modify
22882 + * it under the terms of the GNU General Public License as published by
22883 + * the Free Software Foundation; either version 2 of the License, or
22884 + * (at your option) any later version.
22886 + * This program is distributed in the hope that it will be useful,
22887 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
22888 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
22889 + * GNU General Public License for more details.
22891 + * You should have received a copy of the GNU General Public License
22892 + * along with this program; if not, write to the Free Software
22893 + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
22897 + * sub-routines for VFS
22900 +#ifndef __AUFS_VFSUB_H__
22901 +#define __AUFS_VFSUB_H__
22905 +#include <linux/fs.h>
22906 +#include <linux/fs_stack.h>
22908 +/* ---------------------------------------------------------------------- */
22910 +/* lock subclass for lower inode */
22911 +/* default MAX_LOCKDEP_SUBCLASSES(8) is not enough */
22912 +/* reduce? gave up. */
22914 + AuLsc_I_Begin = I_MUTEX_QUOTA, /* 4 */
22915 + AuLsc_I_PARENT, /* lower inode, parent first */
22916 + AuLsc_I_PARENT2, /* copyup dirs */
22917 + AuLsc_I_PARENT3, /* copyup wh */
22923 +/* to debug easier, do not make them inlined functions */
22924 +#define MtxMustLock(mtx) AuDebugOn(!mutex_is_locked(mtx))
22925 +#define IMustLock(i) MtxMustLock(&(i)->i_mutex)
22927 +/* ---------------------------------------------------------------------- */
22929 +static inline void vfsub_copy_inode_size(struct inode *inode,
22930 + struct inode *h_inode)
22932 + spin_lock(&inode->i_lock);
22933 + fsstack_copy_inode_size(inode, h_inode);
22934 + spin_unlock(&inode->i_lock);
22937 +int vfsub_update_h_iattr(struct path *h_path, int *did);
22938 +struct file *vfsub_filp_open(const char *path, int oflags, int mode);
22939 +int vfsub_path_lookup(const char *name, unsigned int flags,
22940 + struct nameidata *nd);
22941 +struct dentry *vfsub_lookup_one_len(const char *name, struct dentry *parent,
22943 +struct dentry *vfsub_lookup_hash(struct nameidata *nd);
22945 +/* ---------------------------------------------------------------------- */
22948 +struct dentry *vfsub_lock_rename(struct dentry *d1, struct au_hinode *hdir1,
22949 + struct dentry *d2, struct au_hinode *hdir2);
22950 +void vfsub_unlock_rename(struct dentry *d1, struct au_hinode *hdir1,
22951 + struct dentry *d2, struct au_hinode *hdir2);
22953 +int vfsub_create(struct inode *dir, struct path *path, int mode);
22954 +int vfsub_symlink(struct inode *dir, struct path *path,
22955 + const char *symname);
22956 +int vfsub_mknod(struct inode *dir, struct path *path, int mode, dev_t dev);
22957 +int vfsub_link(struct dentry *src_dentry, struct inode *dir,
22958 + struct path *path);
22959 +int vfsub_rename(struct inode *src_hdir, struct dentry *src_dentry,
22960 + struct inode *hdir, struct path *path);
22961 +int vfsub_mkdir(struct inode *dir, struct path *path, int mode);
22962 +int vfsub_rmdir(struct inode *dir, struct path *path);
22964 +/* ---------------------------------------------------------------------- */
22966 +ssize_t vfsub_read_u(struct file *file, char __user *ubuf, size_t count,
22968 +ssize_t vfsub_read_k(struct file *file, void *kbuf, size_t count,
22970 +ssize_t vfsub_write_u(struct file *file, const char __user *ubuf, size_t count,
22972 +ssize_t vfsub_write_k(struct file *file, void *kbuf, size_t count,
22974 +int vfsub_readdir(struct file *file, filldir_t filldir, void *arg);
22976 +static inline void vfsub_file_accessed(struct file *h_file)
22978 + file_accessed(h_file);
22979 + vfsub_update_h_iattr(&h_file->f_path, /*did*/NULL); /*ignore*/
22982 +static inline void vfsub_touch_atime(struct vfsmount *h_mnt,
22983 + struct dentry *h_dentry)
22985 + struct path h_path = {
22986 + .dentry = h_dentry,
22989 + touch_atime(h_mnt, h_dentry);
22990 + vfsub_update_h_iattr(&h_path, /*did*/NULL); /*ignore*/
22993 +long vfsub_splice_to(struct file *in, loff_t *ppos,
22994 + struct pipe_inode_info *pipe, size_t len,
22995 + unsigned int flags);
22996 +long vfsub_splice_from(struct pipe_inode_info *pipe, struct file *out,
22997 + loff_t *ppos, size_t len, unsigned int flags);
22998 +int vfsub_trunc(struct path *h_path, loff_t length, unsigned int attr,
22999 + struct file *h_file);
23001 +/* ---------------------------------------------------------------------- */
23003 +static inline loff_t vfsub_llseek(struct file *file, loff_t offset, int origin)
23008 + err = vfs_llseek(file, offset, origin);
23013 +/* ---------------------------------------------------------------------- */
23015 +int vfsub_sio_mkdir(struct inode *dir, struct path *path, int mode);
23016 +int vfsub_sio_rmdir(struct inode *dir, struct path *path);
23017 +int vfsub_sio_notify_change(struct path *path, struct iattr *ia);
23018 +int vfsub_notify_change(struct path *path, struct iattr *ia);
23019 +int vfsub_unlink(struct inode *dir, struct path *path, int force);
23021 +#endif /* __KERNEL__ */
23022 +#endif /* __AUFS_VFSUB_H__ */
23023 diff --git a/fs/aufs/wbr_policy.c b/fs/aufs/wbr_policy.c
23024 new file mode 100644
23025 index 0000000..05a8c1e
23027 +++ b/fs/aufs/wbr_policy.c
23030 + * Copyright (C) 2005-2009 Junjiro R. Okajima
23032 + * This program, aufs is free software; you can redistribute it and/or modify
23033 + * it under the terms of the GNU General Public License as published by
23034 + * the Free Software Foundation; either version 2 of the License, or
23035 + * (at your option) any later version.
23037 + * This program is distributed in the hope that it will be useful,
23038 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
23039 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
23040 + * GNU General Public License for more details.
23042 + * You should have received a copy of the GNU General Public License
23043 + * along with this program; if not, write to the Free Software
23044 + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
23048 + * policies for selecting one among multiple writable branches
23051 +#include <linux/statfs.h>
23054 +/* subset of cpup_attr() */
23055 +static noinline_for_stack
23056 +int au_cpdown_attr(struct path *h_path, struct dentry *h_src)
23060 + struct inode *h_isrc;
23062 + h_isrc = h_src->d_inode;
23063 + ia.ia_valid = ATTR_FORCE | ATTR_MODE | ATTR_UID | ATTR_GID;
23064 + ia.ia_mode = h_isrc->i_mode;
23065 + ia.ia_uid = h_isrc->i_uid;
23066 + ia.ia_gid = h_isrc->i_gid;
23067 + sbits = !!(ia.ia_mode & (S_ISUID | S_ISGID));
23068 + au_cpup_attr_flags(h_path->dentry->d_inode, h_isrc);
23069 + err = vfsub_sio_notify_change(h_path, &ia);
23071 + /* is this nfs only? */
23072 + if (!err && sbits && au_test_nfs(h_path->dentry->d_sb)) {
23073 + ia.ia_valid = ATTR_FORCE | ATTR_MODE;
23074 + ia.ia_mode = h_isrc->i_mode;
23075 + err = vfsub_sio_notify_change(h_path, &ia);
23081 +#define AuCpdown_PARENT_OPQ 1
23082 +#define AuCpdown_WHED (1 << 1)
23083 +#define AuCpdown_MADE_DIR (1 << 2)
23084 +#define AuCpdown_DIROPQ (1 << 3)
23085 +#define au_ftest_cpdown(flags, name) ((flags) & AuCpdown_##name)
23086 +#define au_fset_cpdown(flags, name) { (flags) |= AuCpdown_##name; }
23087 +#define au_fclr_cpdown(flags, name) { (flags) &= ~AuCpdown_##name; }
23089 +struct au_cpdown_dir_args {
23090 + struct dentry *parent;
23091 + unsigned int flags;
23094 +static int au_cpdown_dir_opq(struct dentry *dentry, aufs_bindex_t bdst,
23095 + struct au_cpdown_dir_args *a)
23098 + struct dentry *opq_dentry;
23100 + opq_dentry = au_diropq_create(dentry, bdst);
23101 + err = PTR_ERR(opq_dentry);
23102 + if (IS_ERR(opq_dentry))
23104 + dput(opq_dentry);
23105 + au_fset_cpdown(a->flags, DIROPQ);
23111 +static int au_cpdown_dir_wh(struct dentry *dentry, struct dentry *h_parent,
23112 + struct inode *dir, aufs_bindex_t bdst)
23115 + struct path h_path;
23116 + struct au_branch *br;
23118 + br = au_sbr(dentry->d_sb, bdst);
23119 + h_path.dentry = au_wh_lkup(h_parent, &dentry->d_name, br);
23120 + err = PTR_ERR(h_path.dentry);
23121 + if (IS_ERR(h_path.dentry))
23125 + if (h_path.dentry->d_inode) {
23126 + h_path.mnt = br->br_mnt;
23127 + err = au_wh_unlink_dentry(au_h_iptr(dir, bdst), &h_path,
23130 + dput(h_path.dentry);
23136 +static int au_cpdown_dir(struct dentry *dentry, aufs_bindex_t bdst,
23137 + struct dentry *h_parent, void *arg)
23140 + aufs_bindex_t bend, bopq, bstart;
23141 + unsigned char parent_opq;
23142 + struct path h_path;
23143 + struct dentry *parent;
23144 + struct inode *h_dir, *h_inode, *inode, *dir;
23145 + struct au_cpdown_dir_args *args = arg;
23147 + bstart = au_dbstart(dentry);
23148 + /* dentry is di-locked */
23149 + parent = dget_parent(dentry);
23150 + dir = parent->d_inode;
23151 + h_dir = h_parent->d_inode;
23152 + AuDebugOn(h_dir != au_h_iptr(dir, bdst));
23153 + IMustLock(h_dir);
23155 + err = au_lkup_neg(dentry, bdst);
23156 + if (unlikely(err < 0))
23158 + h_path.dentry = au_h_dptr(dentry, bdst);
23159 + h_path.mnt = au_sbr_mnt(dentry->d_sb, bdst);
23160 + err = vfsub_sio_mkdir(au_h_iptr(dir, bdst), &h_path,
23161 + S_IRWXU | S_IRUGO | S_IXUGO);
23162 + if (unlikely(err))
23164 + au_fset_cpdown(args->flags, MADE_DIR);
23166 + bend = au_dbend(dentry);
23167 + bopq = au_dbdiropq(dentry);
23168 + au_fclr_cpdown(args->flags, WHED);
23169 + au_fclr_cpdown(args->flags, DIROPQ);
23170 + if (au_dbwh(dentry) == bdst)
23171 + au_fset_cpdown(args->flags, WHED);
23172 + if (!au_ftest_cpdown(args->flags, PARENT_OPQ) && bopq <= bdst)
23173 + au_fset_cpdown(args->flags, PARENT_OPQ);
23174 + parent_opq = (au_ftest_cpdown(args->flags, PARENT_OPQ)
23175 + && args->parent == dentry);
23176 + h_inode = h_path.dentry->d_inode;
23177 + mutex_lock_nested(&h_inode->i_mutex, AuLsc_I_CHILD);
23178 + if (au_ftest_cpdown(args->flags, WHED)) {
23179 + err = au_cpdown_dir_opq(dentry, bdst, args);
23180 + if (unlikely(err)) {
23181 + mutex_unlock(&h_inode->i_mutex);
23186 + err = au_cpdown_attr(&h_path, au_h_dptr(dentry, bstart));
23187 + mutex_unlock(&h_inode->i_mutex);
23188 + if (unlikely(err))
23191 + if (au_ftest_cpdown(args->flags, WHED)) {
23192 + err = au_cpdown_dir_wh(dentry, h_parent, dir, bdst);
23193 + if (unlikely(err))
23197 + inode = dentry->d_inode;
23198 + if (au_ibend(inode) < bdst)
23199 + au_set_ibend(inode, bdst);
23200 + au_set_h_iptr(inode, bdst, au_igrab(h_inode),
23201 + au_hi_flags(inode, /*isdir*/1));
23202 + goto out; /* success */
23206 + if (au_ftest_cpdown(args->flags, DIROPQ)) {
23207 + mutex_lock_nested(&h_inode->i_mutex, AuLsc_I_CHILD);
23208 + rerr = au_diropq_remove(dentry, bdst);
23209 + mutex_unlock(&h_inode->i_mutex);
23210 + if (unlikely(rerr)) {
23211 + AuIOErr("failed removing diropq for %.*s b%d (%d)\n",
23212 + AuDLNPair(dentry), bdst, rerr);
23218 + if (au_ftest_cpdown(args->flags, MADE_DIR)) {
23219 + rerr = vfsub_sio_rmdir(au_h_iptr(dir, bdst), &h_path);
23220 + if (unlikely(rerr)) {
23221 + AuIOErr("failed removing %.*s b%d (%d)\n",
23222 + AuDLNPair(dentry), bdst, rerr);
23227 + au_set_h_dptr(dentry, bdst, NULL);
23228 + if (au_dbend(dentry) == bdst)
23229 + au_update_dbend(dentry);
23235 +int au_cpdown_dirs(struct dentry *dentry, aufs_bindex_t bdst)
23238 + struct au_cpdown_dir_args args = {
23239 + .parent = dget_parent(dentry),
23243 + err = au_cp_dirs(dentry, bdst, au_cpdown_dir, &args);
23244 + dput(args.parent);
23249 +/* ---------------------------------------------------------------------- */
23251 +/* policies for create */
23253 +static int au_wbr_bu(struct super_block *sb, aufs_bindex_t bindex)
23255 + for (; bindex >= 0; bindex--)
23256 + if (!au_br_rdonly(au_sbr(sb, bindex)))
23261 +/* top down parent */
23262 +static int au_wbr_create_tdp(struct dentry *dentry, int isdir __maybe_unused)
23265 + aufs_bindex_t bstart, bindex;
23266 + struct super_block *sb;
23267 + struct dentry *parent, *h_parent;
23269 + sb = dentry->d_sb;
23270 + bstart = au_dbstart(dentry);
23272 + if (!au_br_rdonly(au_sbr(sb, bstart)))
23276 + parent = dget_parent(dentry);
23277 + for (bindex = au_dbstart(parent); bindex < bstart; bindex++) {
23278 + h_parent = au_h_dptr(parent, bindex);
23279 + if (!h_parent || !h_parent->d_inode)
23282 + if (!au_br_rdonly(au_sbr(sb, bindex))) {
23289 + /* bottom up here */
23290 + if (unlikely(err < 0))
23291 + err = au_wbr_bu(sb, bstart - 1);
23294 + AuDbg("b%d\n", err);
23298 +/* ---------------------------------------------------------------------- */
23300 +/* an exception for the policy other than tdp */
23301 +static int au_wbr_create_exp(struct dentry *dentry)
23304 + aufs_bindex_t bwh, bdiropq;
23305 + struct dentry *parent;
23308 + bwh = au_dbwh(dentry);
23309 + parent = dget_parent(dentry);
23310 + bdiropq = au_dbdiropq(parent);
23312 + if (bdiropq >= 0)
23313 + err = min(bdiropq, bwh);
23316 + AuDbg("%d\n", err);
23317 + } else if (bdiropq >= 0) {
23319 + AuDbg("%d\n", err);
23323 + if (err >= 0 && au_br_rdonly(au_sbr(dentry->d_sb, err)))
23326 + AuDbg("%d\n", err);
23330 +/* ---------------------------------------------------------------------- */
23333 +static int au_wbr_create_init_rr(struct super_block *sb)
23337 + err = au_wbr_bu(sb, au_sbend(sb));
23338 + atomic_set(&au_sbi(sb)->si_wbr_rr_next, -err); /* less important */
23341 + AuDbg("b%d\n", err);
23345 +static int au_wbr_create_rr(struct dentry *dentry, int isdir)
23349 + aufs_bindex_t bindex, bend;
23350 + struct super_block *sb;
23353 + err = au_wbr_create_exp(dentry);
23357 + sb = dentry->d_sb;
23358 + next = &au_sbi(sb)->si_wbr_rr_next;
23359 + bend = au_sbend(sb);
23361 + for (bindex = 0; bindex <= bend; bindex++) {
23363 + err = atomic_dec_return(next) + 1;
23364 + /* modulo for 0 is meaningless */
23365 + if (unlikely(!err))
23366 + err = atomic_dec_return(next) + 1;
23368 + err = atomic_read(next);
23369 + AuDbg("%d\n", err);
23372 + AuDbg("%d\n", err);
23373 + if (!au_br_rdonly(au_sbr(sb, err)))
23379 + AuDbg("%d\n", err);
23383 +/* ---------------------------------------------------------------------- */
23385 +/* most free space */
23386 +static void au_mfs(struct dentry *dentry)
23388 + struct super_block *sb;
23389 + struct au_branch *br;
23390 + struct au_wbr_mfs *mfs;
23391 + aufs_bindex_t bindex, bend;
23393 + unsigned long long b, bavail;
23394 + /* reduce the stack usage */
23395 + struct kstatfs *st;
23397 + st = kmalloc(sizeof(*st), GFP_NOFS);
23398 + if (unlikely(!st)) {
23399 + AuWarn1("failed updating mfs(%d), ignored\n", -ENOMEM);
23404 + sb = dentry->d_sb;
23405 + mfs = &au_sbi(sb)->si_wbr_mfs;
23406 + MtxMustLock(&mfs->mfs_lock);
23407 + mfs->mfs_bindex = -EROFS;
23408 + mfs->mfsrr_bytes = 0;
23409 + bend = au_sbend(sb);
23410 + for (bindex = 0; bindex <= bend; bindex++) {
23411 + br = au_sbr(sb, bindex);
23412 + if (au_br_rdonly(br))
23415 + /* sb->s_root for NFS is unreliable */
23416 + err = vfs_statfs(br->br_mnt->mnt_root, st);
23417 + if (unlikely(err)) {
23418 + AuWarn1("failed statfs, b%d, %d\n", bindex, err);
23422 + /* when the available size is equal, select the lower one */
23423 + BUILD_BUG_ON(sizeof(b) < sizeof(st->f_bavail)
23424 + || sizeof(b) < sizeof(st->f_bsize));
23425 + b = st->f_bavail * st->f_bsize;
23426 + br->br_wbr->wbr_bytes = b;
23427 + if (b >= bavail) {
23429 + mfs->mfs_bindex = bindex;
23430 + mfs->mfs_jiffy = jiffies;
23434 + mfs->mfsrr_bytes = bavail;
23435 + AuDbg("b%d\n", mfs->mfs_bindex);
23439 +static int au_wbr_create_mfs(struct dentry *dentry, int isdir __maybe_unused)
23442 + struct super_block *sb;
23443 + struct au_wbr_mfs *mfs;
23445 + err = au_wbr_create_exp(dentry);
23449 + sb = dentry->d_sb;
23450 + mfs = &au_sbi(sb)->si_wbr_mfs;
23451 + mutex_lock(&mfs->mfs_lock);
23452 + if (time_after(jiffies, mfs->mfs_jiffy + mfs->mfs_expire)
23453 + || mfs->mfs_bindex < 0
23454 + || au_br_rdonly(au_sbr(sb, mfs->mfs_bindex)))
23456 + mutex_unlock(&mfs->mfs_lock);
23457 + err = mfs->mfs_bindex;
23460 + AuDbg("b%d\n", err);
23464 +static int au_wbr_create_init_mfs(struct super_block *sb)
23466 + struct au_wbr_mfs *mfs;
23468 + mfs = &au_sbi(sb)->si_wbr_mfs;
23469 + mutex_init(&mfs->mfs_lock);
23470 + mfs->mfs_jiffy = 0;
23471 + mfs->mfs_bindex = -EROFS;
23476 +static int au_wbr_create_fin_mfs(struct super_block *sb __maybe_unused)
23478 + mutex_destroy(&au_sbi(sb)->si_wbr_mfs.mfs_lock);
23482 +/* ---------------------------------------------------------------------- */
23484 +/* most free space and then round robin */
23485 +static int au_wbr_create_mfsrr(struct dentry *dentry, int isdir)
23488 + struct au_wbr_mfs *mfs;
23490 + err = au_wbr_create_mfs(dentry, isdir);
23492 + mfs = &au_sbi(dentry->d_sb)->si_wbr_mfs;
23493 + mutex_lock(&mfs->mfs_lock);
23494 + if (mfs->mfsrr_bytes < mfs->mfsrr_watermark)
23495 + err = au_wbr_create_rr(dentry, isdir);
23496 + mutex_unlock(&mfs->mfs_lock);
23499 + AuDbg("b%d\n", err);
23503 +static int au_wbr_create_init_mfsrr(struct super_block *sb)
23507 + au_wbr_create_init_mfs(sb); /* ignore */
23508 + err = au_wbr_create_init_rr(sb);
23513 +/* ---------------------------------------------------------------------- */
23515 +/* top down parent and most free space */
23516 +static int au_wbr_create_pmfs(struct dentry *dentry, int isdir)
23519 + unsigned long long b;
23520 + aufs_bindex_t bindex, bstart, bend;
23521 + struct super_block *sb;
23522 + struct dentry *parent, *h_parent;
23523 + struct au_branch *br;
23525 + err = au_wbr_create_tdp(dentry, isdir);
23526 + if (unlikely(err < 0))
23528 + parent = dget_parent(dentry);
23529 + bstart = au_dbstart(parent);
23530 + bend = au_dbtaildir(parent);
23531 + if (bstart == bend)
23532 + goto out_parent; /* success */
23534 + e2 = au_wbr_create_mfs(dentry, isdir);
23536 + goto out_parent; /* success */
23538 + /* when the available size is equal, select upper one */
23539 + sb = dentry->d_sb;
23540 + br = au_sbr(sb, err);
23541 + b = br->br_wbr->wbr_bytes;
23542 + AuDbg("b%d, %llu\n", err, b);
23544 + for (bindex = bstart; bindex <= bend; bindex++) {
23545 + h_parent = au_h_dptr(parent, bindex);
23546 + if (!h_parent || !h_parent->d_inode)
23549 + br = au_sbr(sb, bindex);
23550 + if (!au_br_rdonly(br) && br->br_wbr->wbr_bytes > b) {
23551 + b = br->br_wbr->wbr_bytes;
23553 + AuDbg("b%d, %llu\n", err, b);
23560 + AuDbg("b%d\n", err);
23564 +/* ---------------------------------------------------------------------- */
23566 +/* policies for copyup */
23568 +/* top down parent */
23569 +static int au_wbr_copyup_tdp(struct dentry *dentry)
23571 + return au_wbr_create_tdp(dentry, /*isdir, anything is ok*/0);
23574 +/* bottom up parent */
23575 +static int au_wbr_copyup_bup(struct dentry *dentry)
23578 + aufs_bindex_t bindex, bstart;
23579 + struct dentry *parent, *h_parent;
23580 + struct super_block *sb;
23583 + sb = dentry->d_sb;
23584 + parent = dget_parent(dentry);
23585 + bstart = au_dbstart(parent);
23586 + for (bindex = au_dbstart(dentry); bindex >= bstart; bindex--) {
23587 + h_parent = au_h_dptr(parent, bindex);
23588 + if (!h_parent || !h_parent->d_inode)
23591 + if (!au_br_rdonly(au_sbr(sb, bindex))) {
23598 + /* bottom up here */
23599 + if (unlikely(err < 0))
23600 + err = au_wbr_bu(sb, bstart - 1);
23602 + AuDbg("b%d\n", err);
23607 +static int au_wbr_copyup_bu(struct dentry *dentry)
23611 + err = au_wbr_bu(dentry->d_sb, au_dbstart(dentry));
23613 + AuDbg("b%d\n", err);
23617 +/* ---------------------------------------------------------------------- */
23619 +struct au_wbr_copyup_operations au_wbr_copyup_ops[] = {
23620 + [AuWbrCopyup_TDP] = {
23621 + .copyup = au_wbr_copyup_tdp
23623 + [AuWbrCopyup_BUP] = {
23624 + .copyup = au_wbr_copyup_bup
23626 + [AuWbrCopyup_BU] = {
23627 + .copyup = au_wbr_copyup_bu
23631 +struct au_wbr_create_operations au_wbr_create_ops[] = {
23632 + [AuWbrCreate_TDP] = {
23633 + .create = au_wbr_create_tdp
23635 + [AuWbrCreate_RR] = {
23636 + .create = au_wbr_create_rr,
23637 + .init = au_wbr_create_init_rr
23639 + [AuWbrCreate_MFS] = {
23640 + .create = au_wbr_create_mfs,
23641 + .init = au_wbr_create_init_mfs,
23642 + .fin = au_wbr_create_fin_mfs
23644 + [AuWbrCreate_MFSV] = {
23645 + .create = au_wbr_create_mfs,
23646 + .init = au_wbr_create_init_mfs,
23647 + .fin = au_wbr_create_fin_mfs
23649 + [AuWbrCreate_MFSRR] = {
23650 + .create = au_wbr_create_mfsrr,
23651 + .init = au_wbr_create_init_mfsrr,
23652 + .fin = au_wbr_create_fin_mfs
23654 + [AuWbrCreate_MFSRRV] = {
23655 + .create = au_wbr_create_mfsrr,
23656 + .init = au_wbr_create_init_mfsrr,
23657 + .fin = au_wbr_create_fin_mfs
23659 + [AuWbrCreate_PMFS] = {
23660 + .create = au_wbr_create_pmfs,
23661 + .init = au_wbr_create_init_mfs,
23662 + .fin = au_wbr_create_fin_mfs
23664 + [AuWbrCreate_PMFSV] = {
23665 + .create = au_wbr_create_pmfs,
23666 + .init = au_wbr_create_init_mfs,
23667 + .fin = au_wbr_create_fin_mfs
23670 diff --git a/fs/aufs/whout.c b/fs/aufs/whout.c
23671 new file mode 100644
23672 index 0000000..5e465ca
23674 +++ b/fs/aufs/whout.c
23677 + * Copyright (C) 2005-2009 Junjiro R. Okajima
23679 + * This program, aufs is free software; you can redistribute it and/or modify
23680 + * it under the terms of the GNU General Public License as published by
23681 + * the Free Software Foundation; either version 2 of the License, or
23682 + * (at your option) any later version.
23684 + * This program is distributed in the hope that it will be useful,
23685 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
23686 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
23687 + * GNU General Public License for more details.
23689 + * You should have received a copy of the GNU General Public License
23690 + * along with this program; if not, write to the Free Software
23691 + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
23695 + * whiteout for logical deletion and opaque directory
23698 +#include <linux/fs.h>
23701 +#define WH_MASK S_IRUGO
23704 + * If a directory contains this file, then it is opaque. We start with the
23705 + * .wh. flag so that it is blocked by lookup.
23707 +static struct qstr diropq_name = {
23708 + .name = AUFS_WH_DIROPQ,
23709 + .len = sizeof(AUFS_WH_DIROPQ) - 1
23713 + * generate whiteout name, which is NOT terminated by NULL.
23714 + * @name: original d_name.name
23715 + * @len: original d_name.len
23716 + * @wh: whiteout qstr
23717 + * returns zero when succeeds, otherwise error.
23718 + * succeeded value as wh->name should be freed by kfree().
23720 +int au_wh_name_alloc(struct qstr *wh, const struct qstr *name)
23724 + if (unlikely(name->len > PATH_MAX - AUFS_WH_PFX_LEN))
23725 + return -ENAMETOOLONG;
23727 + wh->len = name->len + AUFS_WH_PFX_LEN;
23728 + p = kmalloc(wh->len, GFP_NOFS);
23731 + memcpy(p, AUFS_WH_PFX, AUFS_WH_PFX_LEN);
23732 + memcpy(p + AUFS_WH_PFX_LEN, name->name, name->len);
23739 +/* ---------------------------------------------------------------------- */
23742 + * test if the @wh_name exists under @h_parent.
23743 + * @try_sio specifies the necessary of super-io.
23745 +int au_wh_test(struct dentry *h_parent, struct qstr *wh_name,
23746 + struct au_branch *br, int try_sio)
23749 + struct dentry *wh_dentry;
23750 + struct inode *h_dir;
23752 + h_dir = h_parent->d_inode;
23754 + wh_dentry = au_lkup_one(wh_name, h_parent, br, /*nd*/NULL);
23756 + wh_dentry = au_sio_lkup_one(wh_name, h_parent, br);
23757 + err = PTR_ERR(wh_dentry);
23758 + if (IS_ERR(wh_dentry))
23762 + if (!wh_dentry->d_inode)
23763 + goto out_wh; /* success */
23766 + if (S_ISREG(wh_dentry->d_inode->i_mode))
23767 + goto out_wh; /* success */
23770 + AuIOErr("%.*s Invalid whiteout entry type 0%o.\n",
23771 + AuDLNPair(wh_dentry), wh_dentry->d_inode->i_mode);
23780 + * test if the @h_dentry sets opaque or not.
23782 +int au_diropq_test(struct dentry *h_dentry, struct au_branch *br)
23785 + struct inode *h_dir;
23787 + h_dir = h_dentry->d_inode;
23788 + err = au_wh_test(h_dentry, &diropq_name, br,
23789 + au_test_h_perm_sio(h_dir, MAY_EXEC));
23794 + * returns a negative dentry whose name is unique and temporary.
23796 +struct dentry *au_whtmp_lkup(struct dentry *h_parent, struct au_branch *br,
23797 + struct qstr *prefix)
23799 + struct dentry *dentry;
23801 + char defname[NAME_MAX - AUFS_MAX_NAMELEN + DNAME_INLINE_LEN_MIN + 1],
23803 + static unsigned short cnt;
23806 + BUILD_BUG_ON(sizeof(cnt) * 2 > AUFS_WH_TMP_LEN);
23809 + qs.len = sizeof(defname) - DNAME_INLINE_LEN_MIN + prefix->len - 1;
23810 + if (unlikely(prefix->len > DNAME_INLINE_LEN_MIN)) {
23811 + dentry = ERR_PTR(-ENAMETOOLONG);
23812 + if (unlikely(qs.len > NAME_MAX))
23814 + dentry = ERR_PTR(-ENOMEM);
23815 + name = kmalloc(qs.len + 1, GFP_NOFS);
23816 + if (unlikely(!name))
23820 + /* doubly whiteout-ed */
23821 + memcpy(name, AUFS_WH_PFX AUFS_WH_PFX, AUFS_WH_PFX_LEN * 2);
23822 + p = name + AUFS_WH_PFX_LEN * 2;
23823 + memcpy(p, prefix->name, prefix->len);
23824 + p += prefix->len;
23826 + AuDebugOn(name + qs.len + 1 - p <= AUFS_WH_TMP_LEN);
23829 + for (i = 0; i < 3; i++) {
23830 + sprintf(p, "%.*d", AUFS_WH_TMP_LEN, cnt++);
23831 + dentry = au_sio_lkup_one(&qs, h_parent, br);
23832 + if (IS_ERR(dentry) || !dentry->d_inode)
23836 + /* AuWarn("could not get random name\n"); */
23837 + dentry = ERR_PTR(-EEXIST);
23838 + AuDbg("%.*s\n", AuLNPair(&qs));
23842 + if (name != defname)
23845 + AuTraceErrPtr(dentry);
23850 + * rename the @h_dentry on @br to the whiteouted temporary name.
23852 +int au_whtmp_ren(struct dentry *h_dentry, struct au_branch *br)
23855 + struct path h_path = {
23856 + .mnt = br->br_mnt
23858 + struct inode *h_dir;
23859 + struct dentry *h_parent;
23861 + h_parent = h_dentry->d_parent; /* dir inode is locked */
23862 + h_dir = h_parent->d_inode;
23863 + IMustLock(h_dir);
23865 + h_path.dentry = au_whtmp_lkup(h_parent, br, &h_dentry->d_name);
23866 + err = PTR_ERR(h_path.dentry);
23867 + if (IS_ERR(h_path.dentry))
23870 + /* under the same dir, no need to lock_rename() */
23871 + err = vfsub_rename(h_dir, h_dentry, h_dir, &h_path);
23873 + dput(h_path.dentry);
23880 +/* ---------------------------------------------------------------------- */
23882 + * functions for removing a whiteout
23885 +static int do_unlink_wh(struct inode *h_dir, struct path *h_path)
23890 + * forces superio when the dir has a sticky bit.
23891 + * this may be a violation of unix fs semantics.
23893 + force = (h_dir->i_mode & S_ISVTX)
23894 + && h_path->dentry->d_inode->i_uid != current->fsuid;
23895 + return vfsub_unlink(h_dir, h_path, force);
23898 +int au_wh_unlink_dentry(struct inode *h_dir, struct path *h_path,
23899 + struct dentry *dentry)
23903 + err = do_unlink_wh(h_dir, h_path);
23904 + if (!err && dentry)
23905 + au_set_dbwh(dentry, -1);
23910 +static int unlink_wh_name(struct dentry *h_parent, struct qstr *wh,
23911 + struct au_branch *br)
23914 + struct path h_path = {
23915 + .mnt = br->br_mnt
23919 + h_path.dentry = au_lkup_one(wh, h_parent, br, /*nd*/NULL);
23920 + if (IS_ERR(h_path.dentry))
23921 + err = PTR_ERR(h_path.dentry);
23923 + if (h_path.dentry->d_inode
23924 + && S_ISREG(h_path.dentry->d_inode->i_mode))
23925 + err = do_unlink_wh(h_parent->d_inode, &h_path);
23926 + dput(h_path.dentry);
23932 +/* ---------------------------------------------------------------------- */
23934 + * initialize/clean whiteout for a branch
23937 +static void au_wh_clean(struct inode *h_dir, struct path *whpath,
23942 + if (!whpath->dentry->d_inode)
23945 + err = mnt_want_write(whpath->mnt);
23948 + err = vfsub_rmdir(h_dir, whpath);
23950 + err = vfsub_unlink(h_dir, whpath, /*force*/0);
23951 + mnt_drop_write(whpath->mnt);
23953 + if (unlikely(err))
23954 + AuWarn("failed removing %.*s (%d), ignored.\n",
23955 + AuDLNPair(whpath->dentry), err);
23958 +static int test_linkable(struct dentry *h_root)
23960 + struct inode *h_dir = h_root->d_inode;
23962 + if (h_dir->i_op && h_dir->i_op->link)
23965 + AuErr("%.*s (%s) doesn't support link(2), use noplink and rw+nolwh\n",
23966 + AuDLNPair(h_root), au_sbtype(h_root->d_sb));
23970 +/* todo: should this mkdir be done in /sbin/mount.aufs helper? */
23971 +static int au_whdir(struct inode *h_dir, struct path *path)
23976 + if (!path->dentry->d_inode) {
23977 + int mode = S_IRWXU;
23979 + if (au_test_nfs(path->dentry->d_sb))
23981 + err = mnt_want_write(path->mnt);
23983 + err = vfsub_mkdir(h_dir, path, mode);
23984 + mnt_drop_write(path->mnt);
23986 + } else if (S_ISDIR(path->dentry->d_inode->i_mode))
23989 + AuErr("unknown %.*s exists\n", AuDLNPair(path->dentry));
23994 +struct au_wh_base {
23995 + const struct qstr *name;
23996 + struct dentry *dentry;
23999 +static void au_wh_init_ro(struct inode *h_dir, struct au_wh_base base[],
24000 + struct path *h_path)
24002 + h_path->dentry = base[AuBrWh_BASE].dentry;
24003 + au_wh_clean(h_dir, h_path, /*isdir*/0);
24004 + h_path->dentry = base[AuBrWh_PLINK].dentry;
24005 + au_wh_clean(h_dir, h_path, /*isdir*/1);
24006 + h_path->dentry = base[AuBrWh_ORPH].dentry;
24007 + au_wh_clean(h_dir, h_path, /*isdir*/1);
24011 + * returns tri-state,
24012 + * minus: error, caller should print the mesage
24014 + * plus: error, caller should NOT print the mesage
24016 +static int au_wh_init_rw_nolink(struct dentry *h_root, struct au_wbr *wbr,
24017 + int do_plink, struct au_wh_base base[],
24018 + struct path *h_path)
24021 + struct inode *h_dir;
24023 + h_dir = h_root->d_inode;
24024 + h_path->dentry = base[AuBrWh_BASE].dentry;
24025 + au_wh_clean(h_dir, h_path, /*isdir*/0);
24026 + h_path->dentry = base[AuBrWh_PLINK].dentry;
24028 + err = test_linkable(h_root);
24029 + if (unlikely(err)) {
24034 + err = au_whdir(h_dir, h_path);
24035 + if (unlikely(err))
24037 + wbr->wbr_plink = dget(base[AuBrWh_PLINK].dentry);
24039 + au_wh_clean(h_dir, h_path, /*isdir*/1);
24040 + h_path->dentry = base[AuBrWh_ORPH].dentry;
24041 + err = au_whdir(h_dir, h_path);
24042 + if (unlikely(err))
24044 + wbr->wbr_orph = dget(base[AuBrWh_ORPH].dentry);
24051 + * for the moment, aufs supports the branch filesystem which does not support
24052 + * link(2). testing on FAT which does not support i_op->setattr() fully either,
24053 + * copyup failed. finally, such filesystem will not be used as the writable
24056 + * returns tri-state, see above.
24058 +static int au_wh_init_rw(struct dentry *h_root, struct au_wbr *wbr,
24059 + int do_plink, struct au_wh_base base[],
24060 + struct path *h_path)
24063 + struct inode *h_dir;
24065 + WbrWhMustWriteLock(wbr);
24067 + err = test_linkable(h_root);
24068 + if (unlikely(err)) {
24074 + * todo: should this create be done in /sbin/mount.aufs helper?
24077 + h_dir = h_root->d_inode;
24078 + if (!base[AuBrWh_BASE].dentry->d_inode) {
24079 + err = mnt_want_write(h_path->mnt);
24081 + h_path->dentry = base[AuBrWh_BASE].dentry;
24082 + err = vfsub_create(h_dir, h_path, WH_MASK);
24083 + mnt_drop_write(h_path->mnt);
24085 + } else if (S_ISREG(base[AuBrWh_BASE].dentry->d_inode->i_mode))
24088 + AuErr("unknown %.*s/%.*s exists\n",
24089 + AuDLNPair(h_root), AuDLNPair(base[AuBrWh_BASE].dentry));
24090 + if (unlikely(err))
24093 + h_path->dentry = base[AuBrWh_PLINK].dentry;
24095 + err = au_whdir(h_dir, h_path);
24096 + if (unlikely(err))
24098 + wbr->wbr_plink = dget(base[AuBrWh_PLINK].dentry);
24100 + au_wh_clean(h_dir, h_path, /*isdir*/1);
24101 + wbr->wbr_whbase = dget(base[AuBrWh_BASE].dentry);
24103 + h_path->dentry = base[AuBrWh_ORPH].dentry;
24104 + err = au_whdir(h_dir, h_path);
24105 + if (unlikely(err))
24107 + wbr->wbr_orph = dget(base[AuBrWh_ORPH].dentry);
24114 + * initialize the whiteout base file/dir for @br.
24116 +int au_wh_init(struct dentry *h_root, struct au_branch *br,
24117 + struct super_block *sb)
24120 + const unsigned char do_plink
24121 + = !!au_opt_test(au_mntflags(sb), PLINK);
24122 + struct path path = {
24123 + .mnt = br->br_mnt
24125 + struct inode *h_dir;
24126 + struct au_wbr *wbr = br->br_wbr;
24127 + static const struct qstr base_name[] = {
24128 + [AuBrWh_BASE] = {
24129 + .name = AUFS_BASE_NAME,
24130 + .len = sizeof(AUFS_BASE_NAME) - 1
24132 + [AuBrWh_PLINK] = {
24133 + .name = AUFS_PLINKDIR_NAME,
24134 + .len = sizeof(AUFS_PLINKDIR_NAME) - 1
24136 + [AuBrWh_ORPH] = {
24137 + .name = AUFS_ORPHDIR_NAME,
24138 + .len = sizeof(AUFS_ORPHDIR_NAME) - 1
24141 + struct au_wh_base base[] = {
24142 + [AuBrWh_BASE] = {
24143 + .name = base_name + AuBrWh_BASE,
24146 + [AuBrWh_PLINK] = {
24147 + .name = base_name + AuBrWh_PLINK,
24150 + [AuBrWh_ORPH] = {
24151 + .name = base_name + AuBrWh_ORPH,
24157 + WbrWhMustWriteLock(wbr);
24159 + h_dir = h_root->d_inode;
24160 + for (i = 0; i < AuBrWh_Last; i++) {
24161 + /* doubly whiteouted */
24162 + struct dentry *d;
24164 + d = au_wh_lkup(h_root, (void *)base[i].name, br);
24165 + err = PTR_ERR(d);
24169 + base[i].dentry = d;
24171 + && wbr->wbr_wh[i]
24172 + && wbr->wbr_wh[i] != base[i].dentry);
24176 + for (i = 0; i < AuBrWh_Last; i++) {
24177 + dput(wbr->wbr_wh[i]);
24178 + wbr->wbr_wh[i] = NULL;
24183 + switch (br->br_perm) {
24184 + case AuBrPerm_RO:
24185 + case AuBrPerm_ROWH:
24186 + case AuBrPerm_RR:
24187 + case AuBrPerm_RRWH:
24188 + au_wh_init_ro(h_dir, base, &path);
24191 + case AuBrPerm_RWNoLinkWH:
24192 + err = au_wh_init_rw_nolink(h_root, wbr, do_plink, base, &path);
24199 + case AuBrPerm_RW:
24200 + err = au_wh_init_rw(h_root, wbr, do_plink, base, &path);
24210 + goto out; /* success */
24213 + AuErr("an error(%d) on the writable branch %.*s(%s)\n",
24214 + err, AuDLNPair(h_root), au_sbtype(h_root->d_sb));
24216 + for (i = 0; i < AuBrWh_Last; i++)
24217 + dput(base[i].dentry);
24221 +/* ---------------------------------------------------------------------- */
24223 + * whiteouts are all hard-linked usually.
24224 + * when its link count reaches a ceiling, we create a new whiteout base
24225 + * asynchronously.
24228 +struct reinit_br_wh {
24229 + struct super_block *sb;
24230 + struct au_branch *br;
24233 +static void reinit_br_wh(void *arg)
24236 + aufs_bindex_t bindex;
24237 + struct path h_path;
24238 + struct reinit_br_wh *a = arg;
24239 + struct au_wbr *wbr;
24240 + struct inode *dir;
24241 + struct dentry *h_root;
24242 + struct au_hinode *hdir;
24245 + wbr = a->br->br_wbr;
24246 + /* big aufs lock */
24247 + si_noflush_write_lock(a->sb);
24248 + if (!au_br_writable(a->br->br_perm))
24250 + bindex = au_br_index(a->sb, a->br->br_id);
24251 + if (unlikely(bindex < 0))
24254 + di_read_lock_parent(a->sb->s_root, AuLock_IR);
24255 + dir = a->sb->s_root->d_inode;
24256 + hdir = au_hi(dir, bindex);
24257 + h_root = au_h_dptr(a->sb->s_root, bindex);
24259 + au_hin_imtx_lock_nested(hdir, AuLsc_I_PARENT);
24260 + wbr_wh_write_lock(wbr);
24261 + err = au_h_verify(wbr->wbr_whbase, au_opt_udba(a->sb), hdir->hi_inode,
24264 + err = mnt_want_write(a->br->br_mnt);
24266 + h_path.dentry = wbr->wbr_whbase;
24267 + h_path.mnt = a->br->br_mnt;
24268 + err = vfsub_unlink(hdir->hi_inode, &h_path, /*force*/0);
24269 + mnt_drop_write(a->br->br_mnt);
24272 + AuWarn("%.*s is moved, ignored\n", AuDLNPair(wbr->wbr_whbase));
24275 + dput(wbr->wbr_whbase);
24276 + wbr->wbr_whbase = NULL;
24278 + err = au_wh_init(h_root, a->br, a->sb);
24279 + wbr_wh_write_unlock(wbr);
24280 + au_hin_imtx_unlock(hdir);
24281 + di_read_unlock(a->sb->s_root, AuLock_IR);
24285 + atomic_dec(&wbr->wbr_wh_running);
24286 + atomic_dec(&a->br->br_count);
24287 + au_nwt_done(&au_sbi(a->sb)->si_nowait);
24288 + si_write_unlock(a->sb);
24290 + if (unlikely(err))
24291 + AuIOErr("err %d\n", err);
24294 +static void kick_reinit_br_wh(struct super_block *sb, struct au_branch *br)
24296 + int do_dec, wkq_err;
24297 + struct reinit_br_wh *arg;
24300 + if (atomic_inc_return(&br->br_wbr->wbr_wh_running) != 1)
24303 + /* ignore ENOMEM */
24304 + arg = kmalloc(sizeof(*arg), GFP_NOFS);
24307 + * dec(wh_running), kfree(arg) and dec(br_count)
24308 + * in reinit function
24312 + atomic_inc(&br->br_count);
24313 + wkq_err = au_wkq_nowait(reinit_br_wh, arg, sb);
24314 + if (unlikely(wkq_err)) {
24315 + atomic_dec(&br->br_wbr->wbr_wh_running);
24316 + atomic_dec(&br->br_count);
24324 + atomic_dec(&br->br_wbr->wbr_wh_running);
24327 +/* ---------------------------------------------------------------------- */
24330 + * create the whiteout @wh.
24332 +static int link_or_create_wh(struct super_block *sb, aufs_bindex_t bindex,
24333 + struct dentry *wh)
24336 + struct path h_path = {
24339 + struct au_branch *br;
24340 + struct au_wbr *wbr;
24341 + struct dentry *h_parent;
24342 + struct inode *h_dir;
24344 + h_parent = wh->d_parent; /* dir inode is locked */
24345 + h_dir = h_parent->d_inode;
24346 + IMustLock(h_dir);
24348 + br = au_sbr(sb, bindex);
24349 + h_path.mnt = br->br_mnt;
24350 + wbr = br->br_wbr;
24351 + wbr_wh_read_lock(wbr);
24352 + if (wbr->wbr_whbase) {
24353 + err = vfsub_link(wbr->wbr_whbase, h_dir, &h_path);
24354 + if (!err || err != -EMLINK)
24357 + /* link count full. re-initialize br_whbase. */
24358 + kick_reinit_br_wh(sb, br);
24361 + /* return this error in this context */
24362 + err = vfsub_create(h_dir, &h_path, WH_MASK);
24365 + wbr_wh_read_unlock(wbr);
24369 +/* ---------------------------------------------------------------------- */
24372 + * create or remove the diropq.
24374 +static struct dentry *do_diropq(struct dentry *dentry, aufs_bindex_t bindex,
24375 + unsigned int flags)
24377 + struct dentry *opq_dentry, *h_dentry;
24378 + struct super_block *sb;
24379 + struct au_branch *br;
24382 + sb = dentry->d_sb;
24383 + br = au_sbr(sb, bindex);
24384 + h_dentry = au_h_dptr(dentry, bindex);
24385 + opq_dentry = au_lkup_one(&diropq_name, h_dentry, br, /*nd*/NULL);
24386 + if (IS_ERR(opq_dentry))
24389 + if (au_ftest_diropq(flags, CREATE)) {
24390 + err = link_or_create_wh(sb, bindex, opq_dentry);
24392 + au_set_dbdiropq(dentry, bindex);
24393 + goto out; /* success */
24396 + struct path tmp = {
24397 + .dentry = opq_dentry,
24398 + .mnt = br->br_mnt
24400 + err = do_unlink_wh(au_h_iptr(dentry->d_inode, bindex), &tmp);
24402 + au_set_dbdiropq(dentry, -1);
24404 + dput(opq_dentry);
24405 + opq_dentry = ERR_PTR(err);
24408 + return opq_dentry;
24411 +struct do_diropq_args {
24412 + struct dentry **errp;
24413 + struct dentry *dentry;
24414 + aufs_bindex_t bindex;
24415 + unsigned int flags;
24418 +static void call_do_diropq(void *args)
24420 + struct do_diropq_args *a = args;
24421 + *a->errp = do_diropq(a->dentry, a->bindex, a->flags);
24424 +struct dentry *au_diropq_sio(struct dentry *dentry, aufs_bindex_t bindex,
24425 + unsigned int flags)
24427 + struct dentry *diropq, *h_dentry;
24429 + h_dentry = au_h_dptr(dentry, bindex);
24430 + if (!au_test_h_perm_sio(h_dentry->d_inode, MAY_EXEC | MAY_WRITE))
24431 + diropq = do_diropq(dentry, bindex, flags);
24434 + struct do_diropq_args args = {
24436 + .dentry = dentry,
24437 + .bindex = bindex,
24441 + wkq_err = au_wkq_wait(call_do_diropq, &args);
24442 + if (unlikely(wkq_err))
24443 + diropq = ERR_PTR(wkq_err);
24449 +/* ---------------------------------------------------------------------- */
24452 + * lookup whiteout dentry.
24453 + * @h_parent: lower parent dentry which must exist and be locked
24454 + * @base_name: name of dentry which will be whiteouted
24455 + * returns dentry for whiteout.
24457 +struct dentry *au_wh_lkup(struct dentry *h_parent, struct qstr *base_name,
24458 + struct au_branch *br)
24461 + struct qstr wh_name;
24462 + struct dentry *wh_dentry;
24464 + err = au_wh_name_alloc(&wh_name, base_name);
24465 + wh_dentry = ERR_PTR(err);
24467 + wh_dentry = au_lkup_one(&wh_name, h_parent, br, /*nd*/NULL);
24468 + kfree(wh_name.name);
24470 + return wh_dentry;
24474 + * link/create a whiteout for @dentry on @bindex.
24476 +struct dentry *au_wh_create(struct dentry *dentry, aufs_bindex_t bindex,
24477 + struct dentry *h_parent)
24479 + struct dentry *wh_dentry;
24480 + struct super_block *sb;
24483 + sb = dentry->d_sb;
24484 + wh_dentry = au_wh_lkup(h_parent, &dentry->d_name, au_sbr(sb, bindex));
24485 + if (!IS_ERR(wh_dentry) && !wh_dentry->d_inode) {
24486 + err = link_or_create_wh(sb, bindex, wh_dentry);
24488 + au_set_dbwh(dentry, bindex);
24491 + wh_dentry = ERR_PTR(err);
24495 + return wh_dentry;
24498 +/* ---------------------------------------------------------------------- */
24500 +/* Delete all whiteouts in this directory on branch bindex. */
24501 +static int del_wh_children(struct dentry *h_dentry, struct au_nhash *whlist,
24502 + aufs_bindex_t bindex, struct au_branch *br)
24505 + unsigned long ul, n;
24506 + struct qstr wh_name;
24508 + struct hlist_head *head;
24509 + struct au_vdir_wh *tpos;
24510 + struct hlist_node *pos;
24511 + struct au_vdir_destr *str;
24515 + wh_name.name = p;
24516 + if (unlikely(!wh_name.name))
24520 + memcpy(p, AUFS_WH_PFX, AUFS_WH_PFX_LEN);
24521 + p += AUFS_WH_PFX_LEN;
24522 + n = whlist->nh_num;
24523 + head = whlist->nh_head;
24524 + for (ul = 0; !err && ul < n; ul++, head++) {
24525 + hlist_for_each_entry(tpos, pos, head, wh_hash) {
24526 + if (tpos->wh_bindex != bindex)
24529 + str = &tpos->wh_str;
24530 + if (str->len + AUFS_WH_PFX_LEN <= PATH_MAX) {
24531 + memcpy(p, str->name, str->len);
24532 + wh_name.len = AUFS_WH_PFX_LEN + str->len;
24533 + err = unlink_wh_name(h_dentry, &wh_name, br);
24538 + AuIOErr("whiteout name too long %.*s\n",
24539 + str->len, str->name);
24544 + __putname(wh_name.name);
24550 +struct del_wh_children_args {
24552 + struct dentry *h_dentry;
24553 + struct au_nhash *whlist;
24554 + aufs_bindex_t bindex;
24555 + struct au_branch *br;
24558 +static void call_del_wh_children(void *args)
24560 + struct del_wh_children_args *a = args;
24561 + *a->errp = del_wh_children(a->h_dentry, a->whlist, a->bindex, a->br);
24564 +/* ---------------------------------------------------------------------- */
24566 +struct au_whtmp_rmdir *au_whtmp_rmdir_alloc(struct super_block *sb, gfp_t gfp)
24568 + struct au_whtmp_rmdir *whtmp;
24570 + unsigned int rdhash;
24572 + SiMustAnyLock(sb);
24574 + whtmp = kmalloc(sizeof(*whtmp), gfp);
24575 + if (unlikely(!whtmp)) {
24576 + whtmp = ERR_PTR(-ENOMEM);
24580 + whtmp->dir = NULL;
24581 + whtmp->wh_dentry = NULL;
24582 + /* no estimation for dir size */
24583 + rdhash = au_sbi(sb)->si_rdhash;
24585 + rdhash = AUFS_RDHASH_DEF;
24586 + err = au_nhash_alloc(&whtmp->whlist, rdhash, gfp);
24587 + if (unlikely(err)) {
24589 + whtmp = ERR_PTR(err);
24596 +void au_whtmp_rmdir_free(struct au_whtmp_rmdir *whtmp)
24598 + dput(whtmp->wh_dentry);
24599 + iput(whtmp->dir);
24600 + au_nhash_wh_free(&whtmp->whlist);
24605 + * rmdir the whiteouted temporary named dir @h_dentry.
24606 + * @whlist: whiteouted children.
24608 +int au_whtmp_rmdir(struct inode *dir, aufs_bindex_t bindex,
24609 + struct dentry *wh_dentry, struct au_nhash *whlist)
24612 + struct path h_tmp;
24613 + struct inode *wh_inode, *h_dir;
24614 + struct au_branch *br;
24616 + h_dir = wh_dentry->d_parent->d_inode; /* dir inode is locked */
24617 + IMustLock(h_dir);
24619 + br = au_sbr(dir->i_sb, bindex);
24620 + wh_inode = wh_dentry->d_inode;
24621 + mutex_lock_nested(&wh_inode->i_mutex, AuLsc_I_CHILD);
24624 + * someone else might change some whiteouts while we were sleeping.
24625 + * it means this whlist may have an obsoleted entry.
24627 + if (!au_test_h_perm_sio(wh_inode, MAY_EXEC | MAY_WRITE))
24628 + err = del_wh_children(wh_dentry, whlist, bindex, br);
24631 + struct del_wh_children_args args = {
24633 + .h_dentry = wh_dentry,
24634 + .whlist = whlist,
24635 + .bindex = bindex,
24639 + wkq_err = au_wkq_wait(call_del_wh_children, &args);
24640 + if (unlikely(wkq_err))
24643 + mutex_unlock(&wh_inode->i_mutex);
24646 + h_tmp.dentry = wh_dentry;
24647 + h_tmp.mnt = br->br_mnt;
24648 + err = vfsub_rmdir(h_dir, &h_tmp);
24649 + /* d_drop(h_dentry); */
24653 + if (au_ibstart(dir) == bindex) {
24654 + au_cpup_attr_timesizes(dir);
24657 + return 0; /* success */
24660 + AuWarn("failed removing %.*s(%d), ignored\n",
24661 + AuDLNPair(wh_dentry), err);
24665 +static void call_rmdir_whtmp(void *args)
24668 + struct au_whtmp_rmdir *a = args;
24669 + struct super_block *sb;
24670 + struct dentry *h_parent;
24671 + struct inode *h_dir;
24672 + struct au_branch *br;
24673 + struct au_hinode *hdir;
24675 + /* rmdir by nfsd may cause deadlock with this i_mutex */
24676 + /* mutex_lock(&a->dir->i_mutex); */
24677 + sb = a->dir->i_sb;
24678 + si_noflush_read_lock(sb);
24679 + err = au_test_ro(sb, a->bindex, NULL);
24680 + if (unlikely(err))
24684 + br = au_sbr(sb, a->bindex);
24685 + ii_write_lock_parent(a->dir);
24686 + h_parent = dget_parent(a->wh_dentry);
24687 + h_dir = h_parent->d_inode;
24688 + hdir = au_hi(a->dir, a->bindex);
24689 + au_hin_imtx_lock_nested(hdir, AuLsc_I_PARENT);
24690 + err = au_h_verify(a->wh_dentry, au_opt_udba(sb), h_dir, h_parent, br);
24692 + err = mnt_want_write(br->br_mnt);
24694 + err = au_whtmp_rmdir(a->dir, a->bindex, a->wh_dentry,
24696 + mnt_drop_write(br->br_mnt);
24699 + au_hin_imtx_unlock(hdir);
24701 + ii_write_unlock(a->dir);
24704 + /* mutex_unlock(&a->dir->i_mutex); */
24705 + au_nwt_done(&au_sbi(sb)->si_nowait);
24706 + si_read_unlock(sb);
24707 + au_whtmp_rmdir_free(a);
24708 + if (unlikely(err))
24709 + AuIOErr("err %d\n", err);
24712 +void au_whtmp_kick_rmdir(struct inode *dir, aufs_bindex_t bindex,
24713 + struct dentry *wh_dentry, struct au_whtmp_rmdir *args)
24719 + /* all post-process will be done in do_rmdir_whtmp(). */
24720 + args->dir = au_igrab(dir);
24721 + args->bindex = bindex;
24722 + args->wh_dentry = dget(wh_dentry);
24723 + wkq_err = au_wkq_nowait(call_rmdir_whtmp, args, dir->i_sb);
24724 + if (unlikely(wkq_err)) {
24725 + AuWarn("rmdir error %.*s (%d), ignored\n",
24726 + AuDLNPair(wh_dentry), wkq_err);
24727 + au_whtmp_rmdir_free(args);
24730 diff --git a/fs/aufs/whout.h b/fs/aufs/whout.h
24731 new file mode 100644
24732 index 0000000..40c6926
24734 +++ b/fs/aufs/whout.h
24737 + * Copyright (C) 2005-2009 Junjiro R. Okajima
24739 + * This program, aufs is free software; you can redistribute it and/or modify
24740 + * it under the terms of the GNU General Public License as published by
24741 + * the Free Software Foundation; either version 2 of the License, or
24742 + * (at your option) any later version.
24744 + * This program is distributed in the hope that it will be useful,
24745 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
24746 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
24747 + * GNU General Public License for more details.
24749 + * You should have received a copy of the GNU General Public License
24750 + * along with this program; if not, write to the Free Software
24751 + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
24755 + * whiteout for logical deletion and opaque directory
24758 +#ifndef __AUFS_WHOUT_H__
24759 +#define __AUFS_WHOUT_H__
24763 +#include <linux/aufs_type.h>
24767 +int au_wh_name_alloc(struct qstr *wh, const struct qstr *name);
24769 +int au_wh_test(struct dentry *h_parent, struct qstr *wh_name,
24770 + struct au_branch *br, int try_sio);
24771 +int au_diropq_test(struct dentry *h_dentry, struct au_branch *br);
24772 +struct dentry *au_whtmp_lkup(struct dentry *h_parent, struct au_branch *br,
24773 + struct qstr *prefix);
24774 +int au_whtmp_ren(struct dentry *h_dentry, struct au_branch *br);
24775 +int au_wh_unlink_dentry(struct inode *h_dir, struct path *h_path,
24776 + struct dentry *dentry);
24777 +int au_wh_init(struct dentry *h_parent, struct au_branch *br,
24778 + struct super_block *sb);
24780 +/* diropq flags */
24781 +#define AuDiropq_CREATE 1
24782 +#define au_ftest_diropq(flags, name) ((flags) & AuDiropq_##name)
24783 +#define au_fset_diropq(flags, name) { (flags) |= AuDiropq_##name; }
24784 +#define au_fclr_diropq(flags, name) { (flags) &= ~AuDiropq_##name; }
24786 +struct dentry *au_diropq_sio(struct dentry *dentry, aufs_bindex_t bindex,
24787 + unsigned int flags);
24788 +struct dentry *au_wh_lkup(struct dentry *h_parent, struct qstr *base_name,
24789 + struct au_branch *br);
24790 +struct dentry *au_wh_create(struct dentry *dentry, aufs_bindex_t bindex,
24791 + struct dentry *h_parent);
24793 +/* real rmdir for the whiteout-ed dir */
24794 +struct au_whtmp_rmdir {
24795 + struct inode *dir;
24796 + aufs_bindex_t bindex;
24797 + struct dentry *wh_dentry;
24798 + struct au_nhash whlist;
24801 +struct au_whtmp_rmdir *au_whtmp_rmdir_alloc(struct super_block *sb, gfp_t gfp);
24802 +void au_whtmp_rmdir_free(struct au_whtmp_rmdir *whtmp);
24803 +int au_whtmp_rmdir(struct inode *dir, aufs_bindex_t bindex,
24804 + struct dentry *wh_dentry, struct au_nhash *whlist);
24805 +void au_whtmp_kick_rmdir(struct inode *dir, aufs_bindex_t bindex,
24806 + struct dentry *wh_dentry, struct au_whtmp_rmdir *args);
24808 +/* ---------------------------------------------------------------------- */
24810 +static inline struct dentry *au_diropq_create(struct dentry *dentry,
24811 + aufs_bindex_t bindex)
24813 + return au_diropq_sio(dentry, bindex, AuDiropq_CREATE);
24816 +static inline int au_diropq_remove(struct dentry *dentry, aufs_bindex_t bindex)
24818 + return PTR_ERR(au_diropq_sio(dentry, bindex, !AuDiropq_CREATE));
24821 +#endif /* __KERNEL__ */
24822 +#endif /* __AUFS_WHOUT_H__ */
24823 diff --git a/fs/aufs/wkq.c b/fs/aufs/wkq.c
24824 new file mode 100644
24825 index 0000000..89656e9
24827 +++ b/fs/aufs/wkq.c
24830 + * Copyright (C) 2005-2009 Junjiro R. Okajima
24832 + * This program, aufs is free software; you can redistribute it and/or modify
24833 + * it under the terms of the GNU General Public License as published by
24834 + * the Free Software Foundation; either version 2 of the License, or
24835 + * (at your option) any later version.
24837 + * This program is distributed in the hope that it will be useful,
24838 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
24839 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
24840 + * GNU General Public License for more details.
24842 + * You should have received a copy of the GNU General Public License
24843 + * along with this program; if not, write to the Free Software
24844 + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
24848 + * workqueue for asynchronous/super-io operations
24849 + * todo: try new dredential scheme
24852 +#include <linux/module.h>
24855 +/* internal workqueue named AUFS_WKQ_NAME */
24856 +static struct au_wkq {
24857 + struct workqueue_struct *q;
24863 +struct au_wkinfo {
24864 + struct work_struct wk;
24865 + struct super_block *sb;
24867 + unsigned int flags; /* see wkq.h */
24869 + au_wkq_func_t func;
24873 + struct completion *comp;
24876 +/* ---------------------------------------------------------------------- */
24878 +static int enqueue(struct au_wkq *wkq, struct au_wkinfo *wkinfo)
24880 + wkinfo->busyp = &wkq->busy;
24881 + if (au_ftest_wkq(wkinfo->flags, WAIT))
24882 + return !queue_work(wkq->q, &wkinfo->wk);
24884 + return !schedule_work(&wkinfo->wk);
24887 +static void do_wkq(struct au_wkinfo *wkinfo)
24889 + unsigned int idle, n;
24893 + if (au_ftest_wkq(wkinfo->flags, WAIT)) {
24896 + for (i = 0; i < aufs_nwkq; i++) {
24897 + n = atomic_inc_return(&au_wkq[i].busy);
24898 + if (n == 1 && !enqueue(au_wkq + i, wkinfo))
24899 + return; /* success */
24905 + atomic_dec(&au_wkq[i].busy);
24908 + idle_idx = aufs_nwkq;
24910 + atomic_inc(&au_wkq[idle_idx].busy);
24911 + if (!enqueue(au_wkq + idle_idx, wkinfo))
24912 + return; /* success */
24914 + /* impossible? */
24915 + AuWarn1("failed to queue_work()\n");
24920 +static void wkq_func(struct work_struct *wk)
24922 + struct au_wkinfo *wkinfo = container_of(wk, struct au_wkinfo, wk);
24924 + wkinfo->func(wkinfo->args);
24925 + atomic_dec_return(wkinfo->busyp);
24926 + if (au_ftest_wkq(wkinfo->flags, WAIT))
24927 + complete(wkinfo->comp);
24929 + kobject_put(&au_sbi(wkinfo->sb)->si_kobj);
24930 + module_put(THIS_MODULE);
24936 + * Since struct completion is large, try allocating it dynamically.
24938 +#if defined(CONFIG_4KSTACKS) || defined(AuTest4KSTACKS)
24939 +#define AuWkqCompDeclare(name) struct completion *comp = NULL
24941 +static int au_wkq_comp_alloc(struct au_wkinfo *wkinfo, struct completion **comp)
24943 + *comp = kmalloc(sizeof(**comp), GFP_NOFS);
24945 + init_completion(*comp);
24946 + wkinfo->comp = *comp;
24952 +static void au_wkq_comp_free(struct completion *comp)
24960 +#define AuWkqCompDeclare(name) \
24961 + DECLARE_COMPLETION_ONSTACK(_ ## name); \
24962 + struct completion *comp = &_ ## name
24964 +static int au_wkq_comp_alloc(struct au_wkinfo *wkinfo, struct completion **comp)
24966 + wkinfo->comp = *comp;
24970 +static void au_wkq_comp_free(struct completion *comp __maybe_unused)
24974 +#endif /* 4KSTACKS */
24976 +static void au_wkq_run(struct au_wkinfo *wkinfo)
24978 + au_dbg_verify_kthread();
24979 + INIT_WORK(&wkinfo->wk, wkq_func);
24983 +int au_wkq_wait(au_wkq_func_t func, void *args)
24986 + AuWkqCompDeclare(comp);
24987 + struct au_wkinfo wkinfo = {
24988 + .flags = AuWkq_WAIT,
24993 + err = au_wkq_comp_alloc(&wkinfo, &comp);
24995 + au_wkq_run(&wkinfo);
24996 + /* no timeout, no interrupt */
24997 + wait_for_completion(wkinfo.comp);
24998 + au_wkq_comp_free(comp);
25005 +int au_wkq_nowait(au_wkq_func_t func, void *args, struct super_block *sb)
25008 + struct au_wkinfo *wkinfo;
25010 + atomic_inc(&au_sbi(sb)->si_nowait.nw_len);
25013 + * wkq_func() must free this wkinfo.
25014 + * it highly depends upon the implementation of workqueue.
25017 + wkinfo = kmalloc(sizeof(*wkinfo), GFP_NOFS);
25020 + wkinfo->flags = !AuWkq_WAIT;
25021 + wkinfo->func = func;
25022 + wkinfo->args = args;
25023 + wkinfo->comp = NULL;
25024 + kobject_get(&au_sbi(sb)->si_kobj);
25025 + __module_get(THIS_MODULE);
25027 + au_wkq_run(wkinfo);
25030 + atomic_dec(&au_sbi(sb)->si_nowait.nw_len);
25036 +/* ---------------------------------------------------------------------- */
25038 +void au_nwt_init(struct au_nowait_tasks *nwt)
25040 + atomic_set(&nwt->nw_len, 0);
25041 + /* smp_mb();*/ /* atomic_set */
25042 + init_waitqueue_head(&nwt->nw_wq);
25045 +void au_wkq_fin(void)
25049 + for (i = 0; i < aufs_nwkq; i++)
25050 + if (au_wkq[i].q && !IS_ERR(au_wkq[i].q))
25051 + destroy_workqueue(au_wkq[i].q);
25055 +int __init au_wkq_init(void)
25058 + struct au_wkq *nowaitq;
25060 + /* '+1' is for accounting of nowait queue */
25062 + au_wkq = kcalloc(aufs_nwkq + 1, sizeof(*au_wkq), GFP_NOFS);
25063 + if (unlikely(!au_wkq))
25067 + for (i = 0; i < aufs_nwkq; i++) {
25068 + au_wkq[i].q = create_singlethread_workqueue(AUFS_WKQ_NAME);
25069 + if (au_wkq[i].q && !IS_ERR(au_wkq[i].q)) {
25070 + atomic_set(&au_wkq[i].busy, 0);
25074 + err = PTR_ERR(au_wkq[i].q);
25079 + /* nowait accounting */
25080 + nowaitq = au_wkq + aufs_nwkq;
25081 + atomic_set(&nowaitq->busy, 0);
25082 + nowaitq->q = NULL;
25083 + /* smp_mb(); */ /* atomic_set */
25088 diff --git a/fs/aufs/wkq.h b/fs/aufs/wkq.h
25089 new file mode 100644
25090 index 0000000..b5b6a61
25092 +++ b/fs/aufs/wkq.h
25095 + * Copyright (C) 2005-2009 Junjiro R. Okajima
25097 + * This program, aufs is free software; you can redistribute it and/or modify
25098 + * it under the terms of the GNU General Public License as published by
25099 + * the Free Software Foundation; either version 2 of the License, or
25100 + * (at your option) any later version.
25102 + * This program is distributed in the hope that it will be useful,
25103 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
25104 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
25105 + * GNU General Public License for more details.
25107 + * You should have received a copy of the GNU General Public License
25108 + * along with this program; if not, write to the Free Software
25109 + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
25113 + * workqueue for asynchronous/super-io operations
25114 + * todo: try new credentials management scheme
25117 +#ifndef __AUFS_WKQ_H__
25118 +#define __AUFS_WKQ_H__
25122 +#include <linux/sched.h>
25123 +#include <linux/wait.h>
25124 +#include <linux/aufs_type.h>
25126 +struct super_block;
25128 +/* ---------------------------------------------------------------------- */
25131 + * in the next operation, wait for the 'nowait' tasks in system-wide workqueue
25133 +struct au_nowait_tasks {
25135 + wait_queue_head_t nw_wq;
25138 +/* ---------------------------------------------------------------------- */
25140 +typedef void (*au_wkq_func_t)(void *args);
25143 +#define AuWkq_WAIT 1
25144 +#define au_ftest_wkq(flags, name) ((flags) & AuWkq_##name)
25145 +#define au_fset_wkq(flags, name) { (flags) |= AuWkq_##name; }
25146 +#define au_fclr_wkq(flags, name) { (flags) &= ~AuWkq_##name; }
25149 +int au_wkq_wait(au_wkq_func_t func, void *args);
25150 +int au_wkq_nowait(au_wkq_func_t func, void *args, struct super_block *sb);
25151 +void au_nwt_init(struct au_nowait_tasks *nwt);
25152 +int __init au_wkq_init(void);
25153 +void au_wkq_fin(void);
25155 +/* ---------------------------------------------------------------------- */
25157 +static inline int au_test_wkq(struct task_struct *tsk)
25159 + return !tsk->mm && !strcmp(tsk->comm, AUFS_WKQ_NAME);
25162 +static inline void au_nwt_done(struct au_nowait_tasks *nwt)
25164 + if (!atomic_dec_return(&nwt->nw_len))
25165 + wake_up_all(&nwt->nw_wq);
25168 +static inline int au_nwt_flush(struct au_nowait_tasks *nwt)
25170 + wait_event(nwt->nw_wq, !atomic_read(&nwt->nw_len));
25174 +#endif /* __KERNEL__ */
25175 +#endif /* __AUFS_WKQ_H__ */
25176 diff --git a/fs/aufs/xino.c b/fs/aufs/xino.c
25177 new file mode 100644
25178 index 0000000..25826ef
25180 +++ b/fs/aufs/xino.c
25183 + * Copyright (C) 2005-2009 Junjiro R. Okajima
25185 + * This program, aufs is free software; you can redistribute it and/or modify
25186 + * it under the terms of the GNU General Public License as published by
25187 + * the Free Software Foundation; either version 2 of the License, or
25188 + * (at your option) any later version.
25190 + * This program is distributed in the hope that it will be useful,
25191 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
25192 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
25193 + * GNU General Public License for more details.
25195 + * You should have received a copy of the GNU General Public License
25196 + * along with this program; if not, write to the Free Software
25197 + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
25201 + * external inode number translation table and bitmap
25204 +#include <linux/file.h>
25205 +#include <linux/seq_file.h>
25206 +#include <linux/uaccess.h>
25209 +ssize_t xino_fread(au_readf_t func, struct file *file, void *buf, size_t size,
25213 + mm_segment_t oldfs;
25215 + oldfs = get_fs();
25216 + set_fs(KERNEL_DS);
25218 + /* todo: signal_pending? */
25219 + err = func(file, (char __user *)buf, size, pos);
25220 + } while (err == -EAGAIN || err == -EINTR);
25223 +#if 0 /* reserved for future use */
25225 + fsnotify_access(file->f_dentry);
25231 +/* ---------------------------------------------------------------------- */
25233 +static ssize_t do_xino_fwrite(au_writef_t func, struct file *file, void *buf,
25234 + size_t size, loff_t *pos)
25237 + mm_segment_t oldfs;
25239 + oldfs = get_fs();
25240 + set_fs(KERNEL_DS);
25243 + /* todo: signal_pending? */
25244 + err = func(file, (const char __user *)buf, size, pos);
25245 + } while (err == -EAGAIN || err == -EINTR);
25249 +#if 0 /* reserved for future use */
25251 + fsnotify_modify(file->f_dentry);
25257 +struct do_xino_fwrite_args {
25259 + au_writef_t func;
25260 + struct file *file;
25266 +static void call_do_xino_fwrite(void *args)
25268 + struct do_xino_fwrite_args *a = args;
25269 + *a->errp = do_xino_fwrite(a->func, a->file, a->buf, a->size, a->pos);
25272 +ssize_t xino_fwrite(au_writef_t func, struct file *file, void *buf, size_t size,
25277 + /* todo: signal block and no wkq? */
25278 + /* todo: new credential scheme */
25280 + * it breaks RLIMIT_FSIZE and normal user's limit,
25281 + * users should care about quota and real 'filesystem full.'
25283 + if (!au_test_wkq(current)) {
25285 + struct do_xino_fwrite_args args = {
25294 + wkq_err = au_wkq_wait(call_do_xino_fwrite, &args);
25295 + if (unlikely(wkq_err))
25298 + err = do_xino_fwrite(func, file, buf, size, pos);
25303 +/* ---------------------------------------------------------------------- */
25306 + * create a new xinofile at the same place/path as @base_file.
25308 +struct file *au_xino_create2(struct file *base_file, struct file *copy_src)
25310 + struct file *file;
25311 + struct dentry *base, *dentry, *parent;
25312 + struct inode *dir;
25313 + struct qstr *name;
25316 + base = base_file->f_dentry;
25317 + parent = base->d_parent; /* dir inode is locked */
25318 + dir = parent->d_inode;
25321 + file = ERR_PTR(-EINVAL);
25322 + name = &base->d_name;
25323 + dentry = vfsub_lookup_one_len(name->name, parent, name->len);
25324 + if (IS_ERR(dentry)) {
25325 + file = (void *)dentry;
25326 + AuErr("%.*s lookup err %ld\n", AuLNPair(name), PTR_ERR(dentry));
25330 + /* no need to mnt_want_write() since we call dentry_open() later */
25331 + err = vfs_create(dir, dentry, S_IRUGO | S_IWUGO, NULL);
25332 + if (unlikely(err)) {
25333 + file = ERR_PTR(err);
25334 + AuErr("%.*s create err %d\n", AuLNPair(name), err);
25338 + file = dentry_open(dget(dentry), mntget(base_file->f_vfsmnt),
25339 + O_RDWR | O_CREAT | O_EXCL | O_LARGEFILE);
25340 + if (IS_ERR(file)) {
25341 + AuErr("%.*s open err %ld\n", AuLNPair(name), PTR_ERR(file));
25345 + err = vfsub_unlink(dir, &file->f_path, /*force*/0);
25346 + if (unlikely(err)) {
25347 + AuErr("%.*s unlink err %d\n", AuLNPair(name), err);
25352 + /* no one can touch copy_src xino */
25353 + err = au_copy_file(file, copy_src,
25354 + i_size_read(copy_src->f_dentry->d_inode));
25355 + if (unlikely(err)) {
25356 + AuErr("%.*s copy err %d\n", AuLNPair(name), err);
25360 + goto out_dput; /* success */
25364 + file = ERR_PTR(err);
25371 +struct au_xino_lock_dir {
25372 + struct au_hinode *hdir;
25373 + struct dentry *parent;
25374 + struct mutex *mtx;
25377 +static void au_xino_lock_dir(struct super_block *sb, struct file *xino,
25378 + struct au_xino_lock_dir *ldir)
25380 + aufs_bindex_t brid, bindex;
25382 + ldir->hdir = NULL;
25384 + brid = au_xino_brid(sb);
25386 + bindex = au_br_index(sb, brid);
25387 + if (bindex >= 0) {
25388 + ldir->hdir = au_hi(sb->s_root->d_inode, bindex);
25389 + au_hin_imtx_lock_nested(ldir->hdir, AuLsc_I_PARENT);
25391 + ldir->parent = dget_parent(xino->f_dentry);
25392 + ldir->mtx = &ldir->parent->d_inode->i_mutex;
25393 + mutex_lock_nested(ldir->mtx, AuLsc_I_PARENT);
25397 +static void au_xino_unlock_dir(struct au_xino_lock_dir *ldir)
25400 + au_hin_imtx_unlock(ldir->hdir);
25402 + mutex_unlock(ldir->mtx);
25403 + dput(ldir->parent);
25407 +/* ---------------------------------------------------------------------- */
25409 +/* trucate xino files asynchronously */
25411 +int au_xino_trunc(struct super_block *sb, aufs_bindex_t bindex)
25414 + aufs_bindex_t bi, bend;
25415 + struct au_branch *br;
25416 + struct file *new_xino, *file;
25417 + struct super_block *h_sb;
25418 + struct au_xino_lock_dir ldir;
25421 + bend = au_sbend(sb);
25422 + if (unlikely(bindex < 0 || bend < bindex))
25424 + br = au_sbr(sb, bindex);
25425 + file = br->br_xino.xi_file;
25429 + au_xino_lock_dir(sb, file, &ldir);
25430 + /* mnt_want_write() is unnecessary here */
25431 + new_xino = au_xino_create2(file, file);
25432 + au_xino_unlock_dir(&ldir);
25433 + err = PTR_ERR(new_xino);
25434 + if (IS_ERR(new_xino))
25438 + br->br_xino.xi_file = new_xino;
25440 + h_sb = br->br_mnt->mnt_sb;
25441 + for (bi = 0; bi <= bend; bi++) {
25442 + if (unlikely(bi == bindex))
25444 + br = au_sbr(sb, bi);
25445 + if (br->br_mnt->mnt_sb != h_sb)
25448 + fput(br->br_xino.xi_file);
25449 + br->br_xino.xi_file = new_xino;
25450 + get_file(new_xino);
25457 +struct xino_do_trunc_args {
25458 + struct super_block *sb;
25459 + struct au_branch *br;
25462 +static void xino_do_trunc(void *_args)
25464 + struct xino_do_trunc_args *args = _args;
25465 + struct super_block *sb;
25466 + struct au_branch *br;
25467 + struct inode *dir;
25469 + aufs_bindex_t bindex;
25473 + dir = sb->s_root->d_inode;
25476 + si_noflush_write_lock(sb);
25477 + ii_read_lock_parent(dir);
25478 + bindex = au_br_index(sb, br->br_id);
25479 + err = au_xino_trunc(sb, bindex);
25481 + && br->br_xino.xi_file->f_dentry->d_inode->i_blocks
25482 + >= br->br_xino_upper)
25483 + br->br_xino_upper += AUFS_XINO_TRUNC_STEP;
25485 + ii_read_unlock(dir);
25486 + if (unlikely(err))
25487 + AuWarn("err b%d, (%d)\n", bindex, err);
25488 + atomic_dec(&br->br_xino_running);
25489 + atomic_dec(&br->br_count);
25490 + au_nwt_done(&au_sbi(sb)->si_nowait);
25491 + si_write_unlock(sb);
25495 +static void xino_try_trunc(struct super_block *sb, struct au_branch *br)
25497 + struct xino_do_trunc_args *args;
25500 + if (br->br_xino.xi_file->f_dentry->d_inode->i_blocks
25501 + < br->br_xino_upper)
25504 + if (atomic_inc_return(&br->br_xino_running) > 1)
25507 + /* lock and kfree() will be called in trunc_xino() */
25508 + args = kmalloc(sizeof(*args), GFP_NOFS);
25509 + if (unlikely(!args)) {
25510 + AuErr1("no memory\n");
25514 + atomic_inc_return(&br->br_count);
25517 + wkq_err = au_wkq_nowait(xino_do_trunc, args, sb);
25519 + return; /* success */
25521 + AuErr("wkq %d\n", wkq_err);
25522 + atomic_dec_return(&br->br_count);
25527 + atomic_dec_return(&br->br_xino_running);
25530 +/* ---------------------------------------------------------------------- */
25532 +static int au_xino_do_write(au_writef_t write, struct file *file,
25533 + ino_t h_ino, ino_t ino)
25539 + if (unlikely(au_loff_max / sizeof(ino) - 1 < pos)) {
25540 + AuIOErr1("too large hi%lu\n", (unsigned long)h_ino);
25543 + pos *= sizeof(ino);
25544 + sz = xino_fwrite(write, file, &ino, sizeof(ino), &pos);
25545 + if (sz == sizeof(ino))
25546 + return 0; /* success */
25548 + AuIOErr("write failed (%zd)\n", sz);
25553 + * write @ino to the xinofile for the specified branch{@sb, @bindex}
25554 + * at the position of @h_ino.
25555 + * even if @ino is zero, it is written to the xinofile and means no entry.
25556 + * if the size of the xino file on a specific filesystem exceeds the watermark,
25557 + * try truncating it.
25559 +int au_xino_write(struct super_block *sb, aufs_bindex_t bindex, ino_t h_ino,
25563 + unsigned int mnt_flags;
25564 + struct au_branch *br;
25566 + BUILD_BUG_ON(sizeof(long long) != sizeof(au_loff_max)
25567 + || ((loff_t)-1) > 0);
25568 + SiMustAnyLock(sb);
25570 + mnt_flags = au_mntflags(sb);
25571 + if (!au_opt_test(mnt_flags, XINO))
25574 + br = au_sbr(sb, bindex);
25575 + err = au_xino_do_write(au_sbi(sb)->si_xwrite, br->br_xino.xi_file,
25578 + if (au_opt_test(mnt_flags, TRUNC_XINO)
25579 + && au_test_fs_trunc_xino(br->br_mnt->mnt_sb))
25580 + xino_try_trunc(sb, br);
25581 + return 0; /* success */
25584 + AuIOErr("write failed (%d)\n", err);
25588 +/* ---------------------------------------------------------------------- */
25590 +/* aufs inode number bitmap */
25592 +static const int page_bits = (int)PAGE_SIZE * BITS_PER_BYTE;
25593 +static ino_t xib_calc_ino(unsigned long pindex, int bit)
25597 + AuDebugOn(bit < 0 || page_bits <= bit);
25598 + ino = AUFS_FIRST_INO + pindex * page_bits + bit;
25602 +static void xib_calc_bit(ino_t ino, unsigned long *pindex, int *bit)
25604 + AuDebugOn(ino < AUFS_FIRST_INO);
25605 + ino -= AUFS_FIRST_INO;
25606 + *pindex = ino / page_bits;
25607 + *bit = ino % page_bits;
25610 +static int xib_pindex(struct super_block *sb, unsigned long pindex)
25615 + struct au_sbinfo *sbinfo;
25616 + struct file *xib;
25617 + unsigned long *p;
25619 + sbinfo = au_sbi(sb);
25620 + MtxMustLock(&sbinfo->si_xib_mtx);
25621 + AuDebugOn(pindex > ULONG_MAX / PAGE_SIZE
25622 + || !au_opt_test(sbinfo->si_mntflags, XINO));
25624 + if (pindex == sbinfo->si_xib_last_pindex)
25627 + xib = sbinfo->si_xib;
25628 + p = sbinfo->si_xib_buf;
25629 + pos = sbinfo->si_xib_last_pindex;
25630 + pos *= PAGE_SIZE;
25631 + sz = xino_fwrite(sbinfo->si_xwrite, xib, p, PAGE_SIZE, &pos);
25632 + if (unlikely(sz != PAGE_SIZE))
25636 + pos *= PAGE_SIZE;
25637 + if (i_size_read(xib->f_dentry->d_inode) >= pos + PAGE_SIZE)
25638 + sz = xino_fread(sbinfo->si_xread, xib, p, PAGE_SIZE, &pos);
25640 + memset(p, 0, PAGE_SIZE);
25641 + sz = xino_fwrite(sbinfo->si_xwrite, xib, p, PAGE_SIZE, &pos);
25643 + if (sz == PAGE_SIZE) {
25644 + sbinfo->si_xib_last_pindex = pindex;
25645 + return 0; /* success */
25649 + AuIOErr1("write failed (%zd)\n", sz);
25656 +/* ---------------------------------------------------------------------- */
25658 +int au_xino_write0(struct super_block *sb, aufs_bindex_t bindex, ino_t h_ino,
25662 + unsigned long pindex;
25663 + struct au_sbinfo *sbinfo;
25665 + if (!au_opt_test(au_mntflags(sb), XINO))
25670 + sbinfo = au_sbi(sb);
25671 + xib_calc_bit(ino, &pindex, &bit);
25672 + AuDebugOn(page_bits <= bit);
25673 + mutex_lock(&sbinfo->si_xib_mtx);
25674 + err = xib_pindex(sb, pindex);
25676 + clear_bit(bit, sbinfo->si_xib_buf);
25677 + sbinfo->si_xib_next_bit = bit;
25679 + mutex_unlock(&sbinfo->si_xib_mtx);
25683 + err = au_xino_write(sb, bindex, h_ino, 0);
25687 +/* get an unused inode number from bitmap */
25688 +ino_t au_xino_new_ino(struct super_block *sb)
25691 + unsigned long *p, pindex, ul, pend;
25692 + struct au_sbinfo *sbinfo;
25693 + struct file *file;
25694 + int free_bit, err;
25696 + if (!au_opt_test(au_mntflags(sb), XINO))
25697 + return iunique(sb, AUFS_FIRST_INO);
25699 + sbinfo = au_sbi(sb);
25700 + mutex_lock(&sbinfo->si_xib_mtx);
25701 + p = sbinfo->si_xib_buf;
25702 + free_bit = sbinfo->si_xib_next_bit;
25703 + if (free_bit < page_bits && !test_bit(free_bit, p))
25704 + goto out; /* success */
25705 + free_bit = find_first_zero_bit(p, page_bits);
25706 + if (free_bit < page_bits)
25707 + goto out; /* success */
25709 + pindex = sbinfo->si_xib_last_pindex;
25710 + for (ul = pindex - 1; ul < ULONG_MAX; ul--) {
25711 + err = xib_pindex(sb, ul);
25712 + if (unlikely(err))
25714 + free_bit = find_first_zero_bit(p, page_bits);
25715 + if (free_bit < page_bits)
25716 + goto out; /* success */
25719 + file = sbinfo->si_xib;
25720 + pend = i_size_read(file->f_dentry->d_inode) / PAGE_SIZE;
25721 + for (ul = pindex + 1; ul <= pend; ul++) {
25722 + err = xib_pindex(sb, ul);
25723 + if (unlikely(err))
25725 + free_bit = find_first_zero_bit(p, page_bits);
25726 + if (free_bit < page_bits)
25727 + goto out; /* success */
25732 + set_bit(free_bit, p);
25733 + sbinfo->si_xib_next_bit++;
25734 + pindex = sbinfo->si_xib_last_pindex;
25735 + mutex_unlock(&sbinfo->si_xib_mtx);
25736 + ino = xib_calc_ino(pindex, free_bit);
25737 + AuDbg("i%lu\n", (unsigned long)ino);
25740 + mutex_unlock(&sbinfo->si_xib_mtx);
25746 + * read @ino from xinofile for the specified branch{@sb, @bindex}
25747 + * at the position of @h_ino.
25748 + * if @ino does not exist and @do_new is true, get new one.
25750 +int au_xino_read(struct super_block *sb, aufs_bindex_t bindex, ino_t h_ino,
25756 + struct file *file;
25757 + struct au_sbinfo *sbinfo;
25760 + if (!au_opt_test(au_mntflags(sb), XINO))
25761 + return 0; /* no xino */
25764 + sbinfo = au_sbi(sb);
25766 + if (unlikely(au_loff_max / sizeof(*ino) - 1 < pos)) {
25767 + AuIOErr1("too large hi%lu\n", (unsigned long)h_ino);
25770 + pos *= sizeof(*ino);
25772 + file = au_sbr(sb, bindex)->br_xino.xi_file;
25773 + if (i_size_read(file->f_dentry->d_inode) < pos + sizeof(*ino))
25774 + return 0; /* no ino */
25776 + sz = xino_fread(sbinfo->si_xread, file, ino, sizeof(*ino), &pos);
25777 + if (sz == sizeof(*ino))
25778 + return 0; /* success */
25781 + if (unlikely(sz >= 0)) {
25783 + AuIOErr("xino read error (%zd)\n", sz);
25789 +/* ---------------------------------------------------------------------- */
25791 +/* create and set a new xino file */
25793 +struct file *au_xino_create(struct super_block *sb, char *fname, int silent)
25795 + struct file *file;
25796 + struct dentry *h_parent, *d;
25797 + struct inode *h_dir;
25801 + * at mount-time, and the xino file is the default path,
25802 + * hinotify is disabled so we have no inotify events to ignore.
25803 + * when a user specified the xino, we cannot get au_hdir to be ignored.
25805 + file = vfsub_filp_open(fname, O_RDWR | O_CREAT | O_EXCL | O_LARGEFILE,
25806 + S_IRUGO | S_IWUGO);
25807 + if (IS_ERR(file)) {
25809 + AuErr("open %s(%ld)\n", fname, PTR_ERR(file));
25813 + /* keep file count */
25814 + h_parent = dget_parent(file->f_dentry);
25815 + h_dir = h_parent->d_inode;
25816 + mutex_lock_nested(&h_dir->i_mutex, AuLsc_I_PARENT);
25817 + /* mnt_want_write() is unnecessary here */
25818 + err = vfsub_unlink(h_dir, &file->f_path, /*force*/0);
25819 + mutex_unlock(&h_dir->i_mutex);
25821 + if (unlikely(err)) {
25823 + AuErr("unlink %s(%d)\n", fname, err);
25828 + d = file->f_dentry;
25829 + if (unlikely(sb == d->d_sb)) {
25831 + AuErr("%s must be outside\n", fname);
25834 + if (unlikely(au_test_fs_bad_xino(d->d_sb))) {
25836 + AuErr("xino doesn't support %s(%s)\n",
25837 + fname, au_sbtype(d->d_sb));
25840 + return file; /* success */
25844 + file = ERR_PTR(err);
25849 + * find another branch who is on the same filesystem of the specified
25850 + * branch{@btgt}. search until @bend.
25852 +static int is_sb_shared(struct super_block *sb, aufs_bindex_t btgt,
25853 + aufs_bindex_t bend)
25855 + aufs_bindex_t bindex;
25856 + struct super_block *tgt_sb = au_sbr_sb(sb, btgt);
25858 + for (bindex = 0; bindex < btgt; bindex++)
25859 + if (unlikely(tgt_sb == au_sbr_sb(sb, bindex)))
25861 + for (bindex++; bindex <= bend; bindex++)
25862 + if (unlikely(tgt_sb == au_sbr_sb(sb, bindex)))
25867 +/* ---------------------------------------------------------------------- */
25870 + * initialize the xinofile for the specified branch @br
25871 + * at the place/path where @base_file indicates.
25872 + * test whether another branch is on the same filesystem or not,
25873 + * if @do_test is true.
25875 +int au_xino_br(struct super_block *sb, struct au_branch *br, ino_t h_ino,
25876 + struct file *base_file, int do_test)
25880 + aufs_bindex_t bend, bindex;
25881 + struct au_branch *shared_br, *b;
25882 + struct file *file;
25883 + struct super_block *tgt_sb;
25885 + shared_br = NULL;
25886 + bend = au_sbend(sb);
25888 + tgt_sb = br->br_mnt->mnt_sb;
25889 + for (bindex = 0; bindex <= bend; bindex++) {
25890 + b = au_sbr(sb, bindex);
25891 + if (tgt_sb == b->br_mnt->mnt_sb) {
25898 + if (!shared_br || !shared_br->br_xino.xi_file) {
25899 + struct au_xino_lock_dir ldir;
25901 + au_xino_lock_dir(sb, base_file, &ldir);
25902 + /* mnt_want_write() is unnecessary here */
25903 + file = au_xino_create2(base_file, NULL);
25904 + au_xino_unlock_dir(&ldir);
25905 + err = PTR_ERR(file);
25906 + if (IS_ERR(file))
25908 + br->br_xino.xi_file = file;
25910 + br->br_xino.xi_file = shared_br->br_xino.xi_file;
25911 + get_file(br->br_xino.xi_file);
25914 + ino = AUFS_ROOT_INO;
25915 + err = au_xino_do_write(au_sbi(sb)->si_xwrite, br->br_xino.xi_file,
25918 + return 0; /* success */
25925 +/* ---------------------------------------------------------------------- */
25927 +/* trucate a xino bitmap file */
25930 +static int do_xib_restore(struct super_block *sb, struct file *file, void *page)
25934 + unsigned long pindex;
25935 + loff_t pos, pend;
25936 + struct au_sbinfo *sbinfo;
25939 + unsigned long *p;
25942 + sbinfo = au_sbi(sb);
25943 + MtxMustLock(&sbinfo->si_xib_mtx);
25944 + p = sbinfo->si_xib_buf;
25945 + func = sbinfo->si_xread;
25946 + pend = i_size_read(file->f_dentry->d_inode);
25948 + while (pos < pend) {
25949 + sz = xino_fread(func, file, page, PAGE_SIZE, &pos);
25951 + if (unlikely(sz <= 0))
25955 + for (ino = page; sz > 0; ino++, sz -= sizeof(ino)) {
25956 + if (unlikely(*ino < AUFS_FIRST_INO))
25959 + xib_calc_bit(*ino, &pindex, &bit);
25960 + AuDebugOn(page_bits <= bit);
25961 + err = xib_pindex(sb, pindex);
25973 +static int xib_restore(struct super_block *sb)
25976 + aufs_bindex_t bindex, bend;
25980 + page = (void *)__get_free_page(GFP_NOFS);
25981 + if (unlikely(!page))
25985 + bend = au_sbend(sb);
25986 + for (bindex = 0; !err && bindex <= bend; bindex++)
25987 + if (!bindex || is_sb_shared(sb, bindex, bindex - 1) < 0)
25988 + err = do_xib_restore
25989 + (sb, au_sbr(sb, bindex)->br_xino.xi_file, page);
25991 + AuDbg("b%d\n", bindex);
25992 + free_page((unsigned long)page);
25998 +int au_xib_trunc(struct super_block *sb)
26003 + struct au_xino_lock_dir ldir;
26004 + struct au_sbinfo *sbinfo;
26005 + unsigned long *p;
26006 + struct file *file;
26008 + SiMustWriteLock(sb);
26011 + sbinfo = au_sbi(sb);
26012 + if (!au_opt_test(sbinfo->si_mntflags, XINO))
26015 + file = sbinfo->si_xib;
26016 + if (i_size_read(file->f_dentry->d_inode) <= PAGE_SIZE)
26019 + au_xino_lock_dir(sb, file, &ldir);
26020 + /* mnt_want_write() is unnecessary here */
26021 + file = au_xino_create2(sbinfo->si_xib, NULL);
26022 + au_xino_unlock_dir(&ldir);
26023 + err = PTR_ERR(file);
26024 + if (IS_ERR(file))
26026 + fput(sbinfo->si_xib);
26027 + sbinfo->si_xib = file;
26029 + p = sbinfo->si_xib_buf;
26030 + memset(p, 0, PAGE_SIZE);
26032 + sz = xino_fwrite(sbinfo->si_xwrite, sbinfo->si_xib, p, PAGE_SIZE, &pos);
26033 + if (unlikely(sz != PAGE_SIZE)) {
26035 + AuIOErr("err %d\n", err);
26041 + mutex_lock(&sbinfo->si_xib_mtx);
26042 + /* mnt_want_write() is unnecessary here */
26043 + err = xib_restore(sb);
26044 + mutex_unlock(&sbinfo->si_xib_mtx);
26050 +/* ---------------------------------------------------------------------- */
26053 + * xino mount option handlers
26055 +static au_readf_t find_readf(struct file *h_file)
26057 + const struct file_operations *fop = h_file->f_op;
26061 + return fop->read;
26062 + if (fop->aio_read)
26063 + return do_sync_read;
26065 + return ERR_PTR(-ENOSYS);
26068 +static au_writef_t find_writef(struct file *h_file)
26070 + const struct file_operations *fop = h_file->f_op;
26074 + return fop->write;
26075 + if (fop->aio_write)
26076 + return do_sync_write;
26078 + return ERR_PTR(-ENOSYS);
26082 +static void xino_clear_xib(struct super_block *sb)
26084 + struct au_sbinfo *sbinfo;
26086 + SiMustWriteLock(sb);
26088 + sbinfo = au_sbi(sb);
26089 + sbinfo->si_xread = NULL;
26090 + sbinfo->si_xwrite = NULL;
26091 + if (sbinfo->si_xib)
26092 + fput(sbinfo->si_xib);
26093 + sbinfo->si_xib = NULL;
26094 + free_page((unsigned long)sbinfo->si_xib_buf);
26095 + sbinfo->si_xib_buf = NULL;
26098 +static int au_xino_set_xib(struct super_block *sb, struct file *base)
26102 + struct au_sbinfo *sbinfo;
26103 + struct file *file;
26105 + SiMustWriteLock(sb);
26107 + sbinfo = au_sbi(sb);
26108 + file = au_xino_create2(base, sbinfo->si_xib);
26109 + err = PTR_ERR(file);
26110 + if (IS_ERR(file))
26112 + if (sbinfo->si_xib)
26113 + fput(sbinfo->si_xib);
26114 + sbinfo->si_xib = file;
26115 + sbinfo->si_xread = find_readf(file);
26116 + sbinfo->si_xwrite = find_writef(file);
26119 + if (!sbinfo->si_xib_buf)
26120 + sbinfo->si_xib_buf = (void *)get_zeroed_page(GFP_NOFS);
26121 + if (unlikely(!sbinfo->si_xib_buf))
26124 + sbinfo->si_xib_last_pindex = 0;
26125 + sbinfo->si_xib_next_bit = 0;
26126 + if (i_size_read(file->f_dentry->d_inode) < PAGE_SIZE) {
26128 + err = xino_fwrite(sbinfo->si_xwrite, file, sbinfo->si_xib_buf,
26129 + PAGE_SIZE, &pos);
26130 + if (unlikely(err != PAGE_SIZE))
26134 + goto out; /* success */
26137 + free_page((unsigned long)sbinfo->si_xib_buf);
26138 + sbinfo->si_xib_buf = NULL;
26142 + fput(sbinfo->si_xib);
26143 + sbinfo->si_xib = NULL;
26144 + sbinfo->si_xread = NULL;
26145 + sbinfo->si_xwrite = NULL;
26150 +/* xino for each branch */
26151 +static void xino_clear_br(struct super_block *sb)
26153 + aufs_bindex_t bindex, bend;
26154 + struct au_branch *br;
26156 + bend = au_sbend(sb);
26157 + for (bindex = 0; bindex <= bend; bindex++) {
26158 + br = au_sbr(sb, bindex);
26159 + if (!br || !br->br_xino.xi_file)
26162 + fput(br->br_xino.xi_file);
26163 + br->br_xino.xi_file = NULL;
26167 +static int au_xino_set_br(struct super_block *sb, struct file *base)
26171 + aufs_bindex_t bindex, bend, bshared;
26173 + struct file *old, *new;
26175 + struct au_branch *br;
26176 + struct inode *inode;
26177 + au_writef_t writef;
26179 + SiMustWriteLock(sb);
26182 + bend = au_sbend(sb);
26183 + fpair = kcalloc(bend + 1, sizeof(*fpair), GFP_NOFS);
26184 + if (unlikely(!fpair))
26187 + inode = sb->s_root->d_inode;
26188 + ino = AUFS_ROOT_INO;
26189 + writef = au_sbi(sb)->si_xwrite;
26190 + for (bindex = 0, p = fpair; bindex <= bend; bindex++, p++) {
26191 + br = au_sbr(sb, bindex);
26192 + bshared = is_sb_shared(sb, bindex, bindex - 1);
26193 + if (bshared >= 0) {
26194 + /* shared xino */
26195 + *p = fpair[bshared];
26196 + get_file(p->new);
26201 + p->old = br->br_xino.xi_file;
26202 + p->new = au_xino_create2(base, br->br_xino.xi_file);
26203 + err = PTR_ERR(p->new);
26204 + if (IS_ERR(p->new)) {
26210 + err = au_xino_do_write(writef, p->new,
26211 + au_h_iptr(inode, bindex)->i_ino, ino);
26212 + if (unlikely(err))
26216 + for (bindex = 0, p = fpair; bindex <= bend; bindex++, p++) {
26217 + br = au_sbr(sb, bindex);
26218 + if (br->br_xino.xi_file)
26219 + fput(br->br_xino.xi_file);
26220 + get_file(p->new);
26221 + br->br_xino.xi_file = p->new;
26225 + for (bindex = 0, p = fpair; bindex <= bend; bindex++, p++)
26235 +void au_xino_clr(struct super_block *sb)
26237 + struct au_sbinfo *sbinfo;
26239 + au_xigen_clr(sb);
26240 + xino_clear_xib(sb);
26241 + xino_clear_br(sb);
26242 + sbinfo = au_sbi(sb);
26243 + /* lvalue, do not call au_mntflags() */
26244 + au_opt_clr(sbinfo->si_mntflags, XINO);
26247 +int au_xino_set(struct super_block *sb, struct au_opt_xino *xino, int remount)
26250 + struct dentry *parent, *cur_parent;
26251 + struct qstr *dname, *cur_name;
26252 + struct file *cur_xino;
26253 + struct inode *dir;
26254 + struct au_sbinfo *sbinfo;
26256 + SiMustWriteLock(sb);
26259 + sbinfo = au_sbi(sb);
26260 + parent = dget_parent(xino->file->f_dentry);
26263 + dname = &xino->file->f_dentry->d_name;
26264 + cur_xino = sbinfo->si_xib;
26266 + cur_parent = dget_parent(cur_xino->f_dentry);
26267 + cur_name = &cur_xino->f_dentry->d_name;
26268 + skip = (cur_parent == parent
26269 + && dname->len == cur_name->len
26270 + && !memcmp(dname->name, cur_name->name,
26272 + dput(cur_parent);
26278 + au_opt_set(sbinfo->si_mntflags, XINO);
26279 + dir = parent->d_inode;
26280 + mutex_lock_nested(&dir->i_mutex, AuLsc_I_PARENT);
26281 + /* mnt_want_write() is unnecessary here */
26282 + err = au_xino_set_xib(sb, xino->file);
26284 + err = au_xigen_set(sb, xino->file);
26286 + err = au_xino_set_br(sb, xino->file);
26287 + mutex_unlock(&dir->i_mutex);
26289 + goto out; /* success */
26292 + AuIOErr("failed creating xino(%d).\n", err);
26299 +/* ---------------------------------------------------------------------- */
26302 + * create a xinofile at the default place/path.
26304 +struct file *au_xino_def(struct super_block *sb)
26306 + struct file *file;
26308 + struct au_branch *br;
26309 + struct super_block *h_sb;
26310 + struct path path;
26311 + aufs_bindex_t bend, bindex, bwr;
26314 + bend = au_sbend(sb);
26316 + for (bindex = 0; bindex <= bend; bindex++) {
26317 + br = au_sbr(sb, bindex);
26318 + if (au_br_writable(br->br_perm)
26319 + && !au_test_fs_bad_xino(br->br_mnt->mnt_sb)) {
26326 + file = ERR_PTR(-ENOMEM);
26327 + page = __getname();
26328 + if (unlikely(!page))
26330 + path.mnt = br->br_mnt;
26331 + path.dentry = au_h_dptr(sb->s_root, bwr);
26332 + p = d_path(&path, page, PATH_MAX - sizeof(AUFS_XINO_FNAME));
26333 + file = (void *)p;
26334 + if (!IS_ERR(p)) {
26335 + strcat(p, "/" AUFS_XINO_FNAME);
26336 + AuDbg("%s\n", p);
26337 + file = au_xino_create(sb, p, /*silent*/0);
26338 + if (!IS_ERR(file))
26339 + au_xino_brid_set(sb, br->br_id);
26343 + file = au_xino_create(sb, AUFS_XINO_DEFPATH, /*silent*/0);
26344 + if (IS_ERR(file))
26346 + h_sb = file->f_dentry->d_sb;
26347 + if (unlikely(au_test_fs_bad_xino(h_sb))) {
26348 + AuErr("xino doesn't support %s(%s)\n",
26349 + AUFS_XINO_DEFPATH, au_sbtype(h_sb));
26351 + file = ERR_PTR(-EINVAL);
26353 + if (!IS_ERR(file))
26354 + au_xino_brid_set(sb, -1);
26361 +/* ---------------------------------------------------------------------- */
26363 +int au_xino_path(struct seq_file *seq, struct file *file)
26367 + err = au_seq_path(seq, &file->f_path);
26368 + if (unlikely(err < 0))
26372 +#define Deleted "\\040(deleted)"
26373 + seq->count -= sizeof(Deleted) - 1;
26374 + AuDebugOn(memcmp(seq->buf + seq->count, Deleted,
26375 + sizeof(Deleted) - 1));
26381 diff --git a/fs/namei.c b/fs/namei.c
26382 index 4ea63ed..2759ad4 100644
26385 @@ -1241,7 +1241,7 @@ out:
26386 * needs parent already locked. Doesn't follow mounts.
26389 -static struct dentry *lookup_hash(struct nameidata *nd)
26390 +struct dentry *lookup_hash(struct nameidata *nd)
26394 @@ -1251,7 +1251,7 @@ static struct dentry *lookup_hash(struct nameidata *nd)
26395 return __lookup_hash(&nd->last, nd->path.dentry, nd);
26398 -static int __lookup_one_len(const char *name, struct qstr *this,
26399 +int __lookup_one_len(const char *name, struct qstr *this,
26400 struct dentry *base, int len)
26402 unsigned long hash;
26403 diff --git a/fs/splice.c b/fs/splice.c
26404 index a1e701c..409245a 100644
26407 @@ -887,8 +887,8 @@ EXPORT_SYMBOL(generic_splice_sendpage);
26409 * Attempt to initiate a splice from pipe to file.
26411 -static long do_splice_from(struct pipe_inode_info *pipe, struct file *out,
26412 - loff_t *ppos, size_t len, unsigned int flags)
26413 +long do_splice_from(struct pipe_inode_info *pipe, struct file *out,
26414 + loff_t *ppos, size_t len, unsigned int flags)
26418 @@ -911,9 +911,9 @@ static long do_splice_from(struct pipe_inode_info *pipe, struct file *out,
26420 * Attempt to initiate a splice from a file to a pipe.
26422 -static long do_splice_to(struct file *in, loff_t *ppos,
26423 - struct pipe_inode_info *pipe, size_t len,
26424 - unsigned int flags)
26425 +long do_splice_to(struct file *in, loff_t *ppos,
26426 + struct pipe_inode_info *pipe, size_t len,
26427 + unsigned int flags)
26431 diff --git a/include/linux/Kbuild b/include/linux/Kbuild
26432 index b68ec09..22d182c 100644
26433 --- a/include/linux/Kbuild
26434 +++ b/include/linux/Kbuild
26435 @@ -34,6 +34,7 @@ header-y += atmppp.h
26436 header-y += atmsap.h
26437 header-y += atmsvc.h
26438 header-y += atm_zatm.h
26439 +header-y += aufs_type.h
26440 header-y += auto_fs4.h
26442 header-y += b1lli.h
26443 diff --git a/include/linux/aufs_type.h b/include/linux/aufs_type.h
26444 new file mode 100644
26445 index 0000000..cf42f85
26447 +++ b/include/linux/aufs_type.h
26450 + * Copyright (C) 2005-2009 Junjiro R. Okajima
26452 + * This program, aufs is free software; you can redistribute it and/or modify
26453 + * it under the terms of the GNU General Public License as published by
26454 + * the Free Software Foundation; either version 2 of the License, or
26455 + * (at your option) any later version.
26457 + * This program is distributed in the hope that it will be useful,
26458 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
26459 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
26460 + * GNU General Public License for more details.
26462 + * You should have received a copy of the GNU General Public License
26463 + * along with this program; if not, write to the Free Software
26464 + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
26467 +#ifndef __AUFS_TYPE_H__
26468 +#define __AUFS_TYPE_H__
26470 +#include <linux/ioctl.h>
26471 +#include <linux/limits.h>
26472 +#include <linux/types.h>
26474 +#define AUFS_VERSION "2-27"
26476 +/* todo? move this to linux-2.6.19/include/magic.h */
26477 +#define AUFS_SUPER_MAGIC ('a' << 24 | 'u' << 16 | 'f' << 8 | 's')
26479 +/* ---------------------------------------------------------------------- */
26481 +#ifdef CONFIG_AUFS_BRANCH_MAX_127
26482 +typedef __s8 aufs_bindex_t;
26483 +#define AUFS_BRANCH_MAX 127
26485 +typedef __s16 aufs_bindex_t;
26486 +#ifdef CONFIG_AUFS_BRANCH_MAX_511
26487 +#define AUFS_BRANCH_MAX 511
26488 +#elif defined(CONFIG_AUFS_BRANCH_MAX_1023)
26489 +#define AUFS_BRANCH_MAX 1023
26490 +#elif defined(CONFIG_AUFS_BRANCH_MAX_32767)
26491 +#define AUFS_BRANCH_MAX 32767
26496 +#ifndef AUFS_BRANCH_MAX
26497 +#error unknown CONFIG_AUFS_BRANCH_MAX value
26499 +#endif /* __KERNEL__ */
26501 +/* ---------------------------------------------------------------------- */
26503 +#define AUFS_NAME "aufs"
26504 +#define AUFS_FSTYPE AUFS_NAME
26506 +#define AUFS_ROOT_INO 2
26507 +#define AUFS_FIRST_INO 11
26509 +#define AUFS_WH_PFX ".wh."
26510 +#define AUFS_WH_PFX_LEN ((int)sizeof(AUFS_WH_PFX) - 1)
26511 +#define AUFS_WH_TMP_LEN 4
26512 +/* a limit for rmdir/rename a dir */
26513 +#define AUFS_MAX_NAMELEN (NAME_MAX \
26514 + - AUFS_WH_PFX_LEN * 2 /* doubly whiteouted */\
26516 + - AUFS_WH_TMP_LEN) /* hex */
26517 +#define AUFS_XINO_FNAME "." AUFS_NAME ".xino"
26518 +#define AUFS_XINO_DEFPATH "/tmp/" AUFS_XINO_FNAME
26519 +#define AUFS_XINO_TRUNC_INIT 64 /* blocks */
26520 +#define AUFS_XINO_TRUNC_STEP 4 /* blocks */
26521 +#define AUFS_DIRWH_DEF 3
26522 +#define AUFS_RDCACHE_DEF 10 /* seconds */
26523 +#define AUFS_RDBLK_DEF 512 /* bytes */
26524 +#define AUFS_RDHASH_DEF 32
26525 +#define AUFS_WKQ_NAME AUFS_NAME "d"
26526 +#define AUFS_NWKQ_DEF 4
26527 +#define AUFS_MFS_SECOND_DEF 30 /* seconds */
26528 +#define AUFS_PLINK_WARN 100 /* number of plinks */
26530 +#define AUFS_DIROPQ_NAME AUFS_WH_PFX ".opq" /* whiteouted doubly */
26531 +#define AUFS_WH_DIROPQ AUFS_WH_PFX AUFS_DIROPQ_NAME
26533 +#define AUFS_BASE_NAME AUFS_WH_PFX AUFS_NAME
26534 +#define AUFS_PLINKDIR_NAME AUFS_WH_PFX "plnk"
26535 +#define AUFS_ORPHDIR_NAME AUFS_WH_PFX "orph"
26537 +/* doubly whiteouted */
26538 +#define AUFS_WH_BASE AUFS_WH_PFX AUFS_BASE_NAME
26539 +#define AUFS_WH_PLINKDIR AUFS_WH_PFX AUFS_PLINKDIR_NAME
26540 +#define AUFS_WH_ORPHDIR AUFS_WH_PFX AUFS_ORPHDIR_NAME
26542 +/* branch permission */
26543 +#define AUFS_BRPERM_RW "rw"
26544 +#define AUFS_BRPERM_RO "ro"
26545 +#define AUFS_BRPERM_RR "rr"
26546 +#define AUFS_BRPERM_WH "wh"
26547 +#define AUFS_BRPERM_NLWH "nolwh"
26548 +#define AUFS_BRPERM_ROWH AUFS_BRPERM_RO "+" AUFS_BRPERM_WH
26549 +#define AUFS_BRPERM_RRWH AUFS_BRPERM_RR "+" AUFS_BRPERM_WH
26550 +#define AUFS_BRPERM_RWNLWH AUFS_BRPERM_RW "+" AUFS_BRPERM_NLWH
26552 +/* ---------------------------------------------------------------------- */
26556 + AuCtl_PLINK_MAINT,
26557 + AuCtl_PLINK_CLEAN,
26559 + /* readdir in userspace */
26563 + /* pathconf wrapper */
26567 +/* borrowed from linux/include/linux/kernel.h */
26569 +#define ALIGN(x, a) __ALIGN_MASK(x, (typeof(x))(a)-1)
26570 +#define __ALIGN_MASK(x, mask) (((x)+(mask))&~(mask))
26573 +/* borrowed from linux/include/linux/compiler-gcc3.h */
26575 +#define __aligned(x) __attribute__((aligned(x)))
26576 +#define __packed __attribute__((packed))
26579 +struct au_rdu_cookie {
26584 + __u32 generation;
26587 +struct au_rdu_ent {
26596 +static inline int au_rdu_len(int nlen)
26598 + /* include the terminating NULL */
26599 + return ALIGN(sizeof(struct au_rdu_ent) + nlen + 1,
26603 +union au_rdu_ent_ul {
26604 + struct au_rdu_ent __user *e;
26605 + unsigned long ul;
26610 + AufsCtlRduV_SZ_PTR,
26617 + __u64 sz; /* AuCtl_RDU */
26618 + __u64 nent; /* AuCtl_RDU_INO */
26620 + union au_rdu_ent_ul ent;
26621 + __u16 verify[AufsCtlRduV_End];
26623 + /* input/output */
26627 + union au_rdu_ent_ul tail;
26628 + /* number of entries which were added in a single call */
26633 + struct au_rdu_cookie cookie;
26636 +#define AuCtlType 'A'
26637 +#define AUFS_CTL_PLINK_MAINT _IO(AuCtlType, AuCtl_PLINK_MAINT)
26638 +#define AUFS_CTL_PLINK_CLEAN _IO(AuCtlType, AuCtl_PLINK_CLEAN)
26639 +#define AUFS_CTL_RDU _IOWR(AuCtlType, AuCtl_RDU, struct aufs_rdu)
26640 +#define AUFS_CTL_RDU_INO _IOWR(AuCtlType, AuCtl_RDU_INO, struct aufs_rdu)
26641 +#define AUFS_CTL_WBR_FD _IO(AuCtlType, AuCtl_WBR_FD)
26643 +#endif /* __AUFS_TYPE_H__ */
26644 diff --git a/include/linux/namei.h b/include/linux/namei.h
26645 index 68f8c32..5522432 100644
26646 --- a/include/linux/namei.h
26647 +++ b/include/linux/namei.h
26648 @@ -71,6 +71,9 @@ extern struct file *lookup_instantiate_filp(struct nameidata *nd, struct dentry
26649 extern struct file *nameidata_to_filp(struct nameidata *nd, int flags);
26650 extern void release_open_intent(struct nameidata *);
26652 +extern struct dentry *lookup_hash(struct nameidata *nd);
26653 +extern int __lookup_one_len(const char *name, struct qstr *this,
26654 + struct dentry *base, int len);
26655 extern struct dentry *lookup_one_len(const char *, struct dentry *, int);
26656 extern struct dentry *lookup_one_noperm(const char *, struct dentry *);
26658 diff --git a/include/linux/splice.h b/include/linux/splice.h
26659 index 528dcb9..5123bc6 100644
26660 --- a/include/linux/splice.h
26661 +++ b/include/linux/splice.h
26662 @@ -71,4 +71,10 @@ extern ssize_t splice_to_pipe(struct pipe_inode_info *,
26663 extern ssize_t splice_direct_to_actor(struct file *, struct splice_desc *,
26664 splice_direct_actor *);
26666 +extern long do_splice_from(struct pipe_inode_info *pipe, struct file *out,
26667 + loff_t *ppos, size_t len, unsigned int flags);
26668 +extern long do_splice_to(struct file *in, loff_t *ppos,
26669 + struct pipe_inode_info *pipe, size_t len,
26670 + unsigned int flags);
26673 diff --git a/scripts/basic/hash b/scripts/basic/hash
26674 new file mode 100644
26675 index 0000000000000000000000000000000000000000..666c5f8620e951471a4362046154a95395a50cc1
26678 zcmb_hYiwM_6`s3$*WTc_W59shUY9j>M6!;96GC{!ahzZ<Nr)W^gm77V*SibrU3d2`
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26680 z2Gme7(z)k+GiPSbyv{uCeZBqb48ssQ_=H~&Sp_rL1>RMwQo4jCDn+{piB?g;c+xKD
26681 zfQ~^X1wbaq4{AaoP4}BY(n4So(^xi12ILi>dK5@veo?Q|W!#UDMnZ;W5bI^S4=e-_
26682 zLK<ljn8b9}L28G7JL)D`z$Be^(}zwJ@H0W@??@$wI#SUksbo68J)Fygm#Ms{TH3yT
26683 z!xovBb}&y6#5Pk#wXz;!Z(!S~&p=L0UD;+!nkVI_ZusB;qUQwa>0m)v?t*8K&<Hu~
26684 z;w!+37rFQo7heee-flC<_BV(+A#6K7nn~L^Cz5q+TcEkaY~~7K_iaRMG?}*ZxmZ-h
26685 zwkI7imQALe5#*ton`bnVOpEpXeQSE`W#Of&Iv?8QlWj8aWnYmP>XXSDwtBsSVj5#s
26686 z0o%<Vo54!(AUQgvnj9ThPYz?Z6h9m&oHVDHZR`CLo0^0uJ#?mAF7H0<1g5@@*r}KK
26687 zc^!Fg+4{yrdHETXTy7J{&phQe){vlh{1~#8+gMYAX~!oeW{nA&dHjIHtU1w4{4_AQ
26688 z=={qa#Xl7Ocxuz&=7fblOf1FcrkfLYK4=D~o`ll$o;d+F7fuFuU2UNx;Z&b!DI72#
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26691 zI}fvnYL$C&-TukWkBgHBkC_KQF^x&%)Ogdb@s>?>`?`(7L8Ew-*(dWyi@#Ud@0ci@
26692 ztlk@f?Xd3{dZM^CWKR9^({dS@({$=N$m9Fiit$(Ew?AZ}`^w)rQ#jdDgzd%KL)Aqm
26693 zRA1Z~YAU8e&81t-QbWmK_{9Gh%f-Mxf?h4%ZN4JDX9k~VOV1Sl`uE436?OXp3lO!c
26694 zSL82%e2$cjd=2C(Df^s`JyTne8^*BisY_u@sV7)8LsN&8jR7c1n+5QR-?@o@nwR*&
26695 ze~|cs>~@ULwh4CZ_)FhnnZVz^d0=WI#QP^+ZV&<;GBp7G@fVv>^LT;ZMXwz!`*xR|
26696 zQ0K>`-g?v*EcI5i+EOo#DL?!ywF<8qSNt=7v~Z|;>mByCiBd}lLyht|=l9a@6;79(
26697 z#?E)klchp6;RzEl`BQ~M=GJYT6|SycA4_4))J~XkE7k)2kAXF}B^QauR#|O1>#FEo
26698 zL(6t%mtSLDHJXX0Bcriv&Jlu<qAhxk$SSV_yX3sroNea7a*<Sn9(}+JVlj)CF!=N*
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git.openpandora.org / openpandora.oe.git / blob