2 * linux/fs/9p/vfs_inode_dotl.c
4 * This file contains vfs inode ops for the 9P2000.L protocol.
6 * Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
7 * Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2
11 * as published by the Free Software Foundation.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to:
20 * Free Software Foundation
21 * 51 Franklin Street, Fifth Floor
22 * Boston, MA 02111-1301 USA
26 #include <linux/module.h>
27 #include <linux/errno.h>
29 #include <linux/file.h>
30 #include <linux/pagemap.h>
31 #include <linux/stat.h>
32 #include <linux/string.h>
33 #include <linux/inet.h>
34 #include <linux/namei.h>
35 #include <linux/idr.h>
36 #include <linux/sched.h>
37 #include <linux/slab.h>
38 #include <linux/xattr.h>
39 #include <linux/posix_acl.h>
40 #include <net/9p/9p.h>
41 #include <net/9p/client.h>
51 v9fs_vfs_mknod_dotl(struct inode *dir, struct dentry *dentry, int omode,
55 * v9fs_get_fsgid_for_create - Helper function to get the gid for creating a
56 * new file system object. This checks the S_ISGID to determine the owning
57 * group of the new file system object.
60 static gid_t v9fs_get_fsgid_for_create(struct inode *dir_inode)
62 BUG_ON(dir_inode == NULL);
64 if (dir_inode->i_mode & S_ISGID) {
65 /* set_gid bit is set.*/
66 return dir_inode->i_gid;
68 return current_fsgid();
72 * v9fs_dentry_from_dir_inode - helper function to get the dentry from
77 static struct dentry *v9fs_dentry_from_dir_inode(struct inode *inode)
79 struct dentry *dentry;
81 spin_lock(&inode->i_lock);
82 /* Directory should have only one entry. */
83 BUG_ON(S_ISDIR(inode->i_mode) && !list_is_singular(&inode->i_dentry));
84 dentry = list_entry(inode->i_dentry.next, struct dentry, d_alias);
85 spin_unlock(&inode->i_lock);
90 v9fs_inode_dotl(struct v9fs_session_info *v9ses, struct p9_fid *fid,
91 struct super_block *sb)
93 struct inode *ret = NULL;
95 struct p9_stat_dotl *st;
97 st = p9_client_getattr_dotl(fid, P9_STATS_BASIC);
101 ret = v9fs_get_inode(sb, st->st_mode);
107 v9fs_stat2inode_dotl(st, ret);
108 ret->i_ino = v9fs_qid2ino(&st->qid);
109 #ifdef CONFIG_9P_FSCACHE
110 v9fs_vcookie_set_qid(ret, &st->qid);
111 v9fs_cache_inode_get_cookie(ret);
113 err = v9fs_get_acl(ret, fid);
126 * v9fs_vfs_create_dotl - VFS hook to create files for 9P2000.L protocol.
127 * @dir: directory inode that is being created
128 * @dentry: dentry that is being deleted
129 * @mode: create permissions
130 * @nd: path information
135 v9fs_vfs_create_dotl(struct inode *dir, struct dentry *dentry, int omode,
136 struct nameidata *nd)
143 struct v9fs_session_info *v9ses;
144 struct p9_fid *fid = NULL;
145 struct p9_fid *dfid, *ofid;
149 struct posix_acl *pacl = NULL, *dacl = NULL;
151 v9ses = v9fs_inode2v9ses(dir);
152 if (nd && nd->flags & LOOKUP_OPEN)
153 flags = nd->intent.open.flags - 1;
156 * create call without LOOKUP_OPEN is due
157 * to mknod of regular files. So use mknod
160 return v9fs_vfs_mknod_dotl(dir, dentry, omode, 0);
163 name = (char *) dentry->d_name.name;
164 P9_DPRINTK(P9_DEBUG_VFS, "v9fs_vfs_create_dotl: name:%s flags:0x%x "
165 "mode:0x%x\n", name, flags, omode);
167 dfid = v9fs_fid_lookup(dentry->d_parent);
170 P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
174 /* clone a fid to use for creation */
175 ofid = p9_client_walk(dfid, 0, NULL, 1);
178 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
182 gid = v9fs_get_fsgid_for_create(dir);
185 /* Update mode based on ACL value */
186 err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
188 P9_DPRINTK(P9_DEBUG_VFS,
189 "Failed to get acl values in creat %d\n", err);
192 err = p9_client_create_dotl(ofid, name, flags, mode, gid, &qid);
194 P9_DPRINTK(P9_DEBUG_VFS,
195 "p9_client_open_dotl failed in creat %d\n",
200 /* instantiate inode and assign the unopened fid to the dentry */
201 fid = p9_client_walk(dfid, 1, &name, 1);
204 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
208 inode = v9fs_inode_from_fid(v9ses, fid, dir->i_sb);
210 err = PTR_ERR(inode);
211 P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n", err);
214 d_instantiate(dentry, inode);
215 err = v9fs_fid_add(dentry, fid);
219 /* Now set the ACL based on the default value */
220 v9fs_set_create_acl(dentry, dacl, pacl);
222 /* Since we are opening a file, assign the open fid to the file */
223 filp = lookup_instantiate_filp(nd, dentry, generic_file_open);
225 p9_client_clunk(ofid);
226 return PTR_ERR(filp);
228 filp->private_data = ofid;
229 #ifdef CONFIG_9P_FSCACHE
231 v9fs_cache_inode_set_cookie(inode, filp);
237 p9_client_clunk(ofid);
239 p9_client_clunk(fid);
244 * v9fs_vfs_mkdir_dotl - VFS mkdir hook to create a directory
245 * @dir: inode that is being unlinked
246 * @dentry: dentry that is being unlinked
247 * @mode: mode for new directory
251 static int v9fs_vfs_mkdir_dotl(struct inode *dir,
252 struct dentry *dentry, int omode)
255 struct v9fs_session_info *v9ses;
256 struct p9_fid *fid = NULL, *dfid = NULL;
262 struct dentry *dir_dentry;
263 struct posix_acl *dacl = NULL, *pacl = NULL;
265 P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name);
267 v9ses = v9fs_inode2v9ses(dir);
270 if (dir->i_mode & S_ISGID)
273 dir_dentry = v9fs_dentry_from_dir_inode(dir);
274 dfid = v9fs_fid_lookup(dir_dentry);
277 P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
282 gid = v9fs_get_fsgid_for_create(dir);
284 /* Update mode based on ACL value */
285 err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
287 P9_DPRINTK(P9_DEBUG_VFS,
288 "Failed to get acl values in mkdir %d\n", err);
291 name = (char *) dentry->d_name.name;
292 err = p9_client_mkdir_dotl(dfid, name, mode, gid, &qid);
296 /* instantiate inode and assign the unopened fid to the dentry */
297 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
298 fid = p9_client_walk(dfid, 1, &name, 1);
301 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
307 inode = v9fs_inode_from_fid(v9ses, fid, dir->i_sb);
309 err = PTR_ERR(inode);
310 P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n",
314 d_instantiate(dentry, inode);
315 err = v9fs_fid_add(dentry, fid);
321 * Not in cached mode. No need to populate
322 * inode with stat. We need to get an inode
323 * so that we can set the acl with dentry
325 inode = v9fs_get_inode(dir->i_sb, mode);
327 err = PTR_ERR(inode);
330 d_instantiate(dentry, inode);
332 /* Now set the ACL based on the default value */
333 v9fs_set_create_acl(dentry, dacl, pacl);
337 p9_client_clunk(fid);
342 v9fs_vfs_getattr_dotl(struct vfsmount *mnt, struct dentry *dentry,
346 struct v9fs_session_info *v9ses;
348 struct p9_stat_dotl *st;
350 P9_DPRINTK(P9_DEBUG_VFS, "dentry: %p\n", dentry);
352 v9ses = v9fs_inode2v9ses(dentry->d_inode);
353 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE)
354 return simple_getattr(mnt, dentry, stat);
356 fid = v9fs_fid_lookup(dentry);
360 /* Ask for all the fields in stat structure. Server will return
361 * whatever it supports
364 st = p9_client_getattr_dotl(fid, P9_STATS_ALL);
368 v9fs_stat2inode_dotl(st, dentry->d_inode);
369 generic_fillattr(dentry->d_inode, stat);
370 /* Change block size to what the server returned */
371 stat->blksize = st->st_blksize;
378 * v9fs_vfs_setattr_dotl - set file metadata
379 * @dentry: file whose metadata to set
380 * @iattr: metadata assignment structure
384 int v9fs_vfs_setattr_dotl(struct dentry *dentry, struct iattr *iattr)
387 struct v9fs_session_info *v9ses;
389 struct p9_iattr_dotl p9attr;
391 P9_DPRINTK(P9_DEBUG_VFS, "\n");
393 retval = inode_change_ok(dentry->d_inode, iattr);
397 p9attr.valid = iattr->ia_valid;
398 p9attr.mode = iattr->ia_mode;
399 p9attr.uid = iattr->ia_uid;
400 p9attr.gid = iattr->ia_gid;
401 p9attr.size = iattr->ia_size;
402 p9attr.atime_sec = iattr->ia_atime.tv_sec;
403 p9attr.atime_nsec = iattr->ia_atime.tv_nsec;
404 p9attr.mtime_sec = iattr->ia_mtime.tv_sec;
405 p9attr.mtime_nsec = iattr->ia_mtime.tv_nsec;
408 v9ses = v9fs_inode2v9ses(dentry->d_inode);
409 fid = v9fs_fid_lookup(dentry);
413 retval = p9_client_setattr(fid, &p9attr);
417 if ((iattr->ia_valid & ATTR_SIZE) &&
418 iattr->ia_size != i_size_read(dentry->d_inode)) {
419 retval = vmtruncate(dentry->d_inode, iattr->ia_size);
424 setattr_copy(dentry->d_inode, iattr);
425 mark_inode_dirty(dentry->d_inode);
426 if (iattr->ia_valid & ATTR_MODE) {
427 /* We also want to update ACL when we update mode bits */
428 retval = v9fs_acl_chmod(dentry);
436 * v9fs_stat2inode_dotl - populate an inode structure with stat info
437 * @stat: stat structure
438 * @inode: inode to populate
439 * @sb: superblock of filesystem
444 v9fs_stat2inode_dotl(struct p9_stat_dotl *stat, struct inode *inode)
447 if ((stat->st_result_mask & P9_STATS_BASIC) == P9_STATS_BASIC) {
448 inode->i_atime.tv_sec = stat->st_atime_sec;
449 inode->i_atime.tv_nsec = stat->st_atime_nsec;
450 inode->i_mtime.tv_sec = stat->st_mtime_sec;
451 inode->i_mtime.tv_nsec = stat->st_mtime_nsec;
452 inode->i_ctime.tv_sec = stat->st_ctime_sec;
453 inode->i_ctime.tv_nsec = stat->st_ctime_nsec;
454 inode->i_uid = stat->st_uid;
455 inode->i_gid = stat->st_gid;
456 inode->i_nlink = stat->st_nlink;
457 inode->i_mode = stat->st_mode;
458 inode->i_rdev = new_decode_dev(stat->st_rdev);
460 if ((S_ISBLK(inode->i_mode)) || (S_ISCHR(inode->i_mode)))
461 init_special_inode(inode, inode->i_mode, inode->i_rdev);
463 i_size_write(inode, stat->st_size);
464 inode->i_blocks = stat->st_blocks;
466 if (stat->st_result_mask & P9_STATS_ATIME) {
467 inode->i_atime.tv_sec = stat->st_atime_sec;
468 inode->i_atime.tv_nsec = stat->st_atime_nsec;
470 if (stat->st_result_mask & P9_STATS_MTIME) {
471 inode->i_mtime.tv_sec = stat->st_mtime_sec;
472 inode->i_mtime.tv_nsec = stat->st_mtime_nsec;
474 if (stat->st_result_mask & P9_STATS_CTIME) {
475 inode->i_ctime.tv_sec = stat->st_ctime_sec;
476 inode->i_ctime.tv_nsec = stat->st_ctime_nsec;
478 if (stat->st_result_mask & P9_STATS_UID)
479 inode->i_uid = stat->st_uid;
480 if (stat->st_result_mask & P9_STATS_GID)
481 inode->i_gid = stat->st_gid;
482 if (stat->st_result_mask & P9_STATS_NLINK)
483 inode->i_nlink = stat->st_nlink;
484 if (stat->st_result_mask & P9_STATS_MODE) {
485 inode->i_mode = stat->st_mode;
486 if ((S_ISBLK(inode->i_mode)) ||
487 (S_ISCHR(inode->i_mode)))
488 init_special_inode(inode, inode->i_mode,
491 if (stat->st_result_mask & P9_STATS_RDEV)
492 inode->i_rdev = new_decode_dev(stat->st_rdev);
493 if (stat->st_result_mask & P9_STATS_SIZE)
494 i_size_write(inode, stat->st_size);
495 if (stat->st_result_mask & P9_STATS_BLOCKS)
496 inode->i_blocks = stat->st_blocks;
498 if (stat->st_result_mask & P9_STATS_GEN)
499 inode->i_generation = stat->st_gen;
501 /* Currently we don't support P9_STATS_BTIME and P9_STATS_DATA_VERSION
502 * because the inode structure does not have fields for them.
507 v9fs_vfs_symlink_dotl(struct inode *dir, struct dentry *dentry,
510 struct v9fs_session_info *v9ses;
512 struct p9_fid *fid = NULL;
519 name = (char *) dentry->d_name.name;
520 P9_DPRINTK(P9_DEBUG_VFS, "v9fs_vfs_symlink_dotl : %lu,%s,%s\n",
521 dir->i_ino, name, symname);
522 v9ses = v9fs_inode2v9ses(dir);
524 dfid = v9fs_fid_lookup(dentry->d_parent);
527 P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
531 gid = v9fs_get_fsgid_for_create(dir);
533 /* Server doesn't alter fid on TSYMLINK. Hence no need to clone it. */
534 err = p9_client_symlink(dfid, name, (char *)symname, gid, &qid);
537 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_symlink failed %d\n", err);
542 /* Now walk from the parent so we can get an unopened fid. */
543 fid = p9_client_walk(dfid, 1, &name, 1);
546 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
552 /* instantiate inode and assign the unopened fid to dentry */
553 inode = v9fs_inode_from_fid(v9ses, fid, dir->i_sb);
555 err = PTR_ERR(inode);
556 P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n",
560 d_instantiate(dentry, inode);
561 err = v9fs_fid_add(dentry, fid);
566 /* Not in cached mode. No need to populate inode with stat */
567 inode = v9fs_get_inode(dir->i_sb, S_IFLNK);
569 err = PTR_ERR(inode);
572 d_instantiate(dentry, inode);
577 p9_client_clunk(fid);
583 * v9fs_vfs_link_dotl - create a hardlink for dotl
584 * @old_dentry: dentry for file to link to
585 * @dir: inode destination for new link
586 * @dentry: dentry for link
591 v9fs_vfs_link_dotl(struct dentry *old_dentry, struct inode *dir,
592 struct dentry *dentry)
595 struct p9_fid *dfid, *oldfid;
597 struct v9fs_session_info *v9ses;
598 struct dentry *dir_dentry;
600 P9_DPRINTK(P9_DEBUG_VFS, "dir ino: %lu, old_name: %s, new_name: %s\n",
601 dir->i_ino, old_dentry->d_name.name,
602 dentry->d_name.name);
604 v9ses = v9fs_inode2v9ses(dir);
605 dir_dentry = v9fs_dentry_from_dir_inode(dir);
606 dfid = v9fs_fid_lookup(dir_dentry);
608 return PTR_ERR(dfid);
610 oldfid = v9fs_fid_lookup(old_dentry);
612 return PTR_ERR(oldfid);
614 name = (char *) dentry->d_name.name;
616 err = p9_client_link(dfid, oldfid, (char *)dentry->d_name.name);
619 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_link failed %d\n", err);
623 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
624 /* Get the latest stat info from server. */
626 struct p9_stat_dotl *st;
628 fid = v9fs_fid_lookup(old_dentry);
632 st = p9_client_getattr_dotl(fid, P9_STATS_BASIC);
636 v9fs_stat2inode_dotl(st, old_dentry->d_inode);
640 ihold(old_dentry->d_inode);
641 d_instantiate(dentry, old_dentry->d_inode);
647 * v9fs_vfs_mknod_dotl - create a special file
648 * @dir: inode destination for new link
649 * @dentry: dentry for file
650 * @mode: mode for creation
651 * @rdev: device associated with special file
655 v9fs_vfs_mknod_dotl(struct inode *dir, struct dentry *dentry, int omode,
661 struct v9fs_session_info *v9ses;
662 struct p9_fid *fid = NULL, *dfid = NULL;
666 struct dentry *dir_dentry;
667 struct posix_acl *dacl = NULL, *pacl = NULL;
669 P9_DPRINTK(P9_DEBUG_VFS,
670 " %lu,%s mode: %x MAJOR: %u MINOR: %u\n", dir->i_ino,
671 dentry->d_name.name, omode, MAJOR(rdev), MINOR(rdev));
673 if (!new_valid_dev(rdev))
676 v9ses = v9fs_inode2v9ses(dir);
677 dir_dentry = v9fs_dentry_from_dir_inode(dir);
678 dfid = v9fs_fid_lookup(dir_dentry);
681 P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
686 gid = v9fs_get_fsgid_for_create(dir);
688 /* Update mode based on ACL value */
689 err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
691 P9_DPRINTK(P9_DEBUG_VFS,
692 "Failed to get acl values in mknod %d\n", err);
695 name = (char *) dentry->d_name.name;
697 err = p9_client_mknod_dotl(dfid, name, mode, rdev, gid, &qid);
701 /* instantiate inode and assign the unopened fid to the dentry */
702 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
703 fid = p9_client_walk(dfid, 1, &name, 1);
706 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
712 inode = v9fs_inode_from_fid(v9ses, fid, dir->i_sb);
714 err = PTR_ERR(inode);
715 P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n",
719 d_instantiate(dentry, inode);
720 err = v9fs_fid_add(dentry, fid);
726 * Not in cached mode. No need to populate inode with stat.
727 * socket syscall returns a fd, so we need instantiate
729 inode = v9fs_get_inode(dir->i_sb, mode);
731 err = PTR_ERR(inode);
734 d_instantiate(dentry, inode);
736 /* Now set the ACL based on the default value */
737 v9fs_set_create_acl(dentry, dacl, pacl);
740 p9_client_clunk(fid);
745 * v9fs_vfs_follow_link_dotl - follow a symlink path
746 * @dentry: dentry for symlink
752 v9fs_vfs_follow_link_dotl(struct dentry *dentry, struct nameidata *nd)
756 char *link = __getname();
759 P9_DPRINTK(P9_DEBUG_VFS, "%s\n", dentry->d_name.name);
762 link = ERR_PTR(-ENOMEM);
765 fid = v9fs_fid_lookup(dentry);
768 link = ERR_PTR(PTR_ERR(fid));
771 retval = p9_client_readlink(fid, &target);
773 strcpy(link, target);
778 link = ERR_PTR(retval);
780 nd_set_link(nd, link);
784 const struct inode_operations v9fs_dir_inode_operations_dotl = {
785 .create = v9fs_vfs_create_dotl,
786 .lookup = v9fs_vfs_lookup,
787 .link = v9fs_vfs_link_dotl,
788 .symlink = v9fs_vfs_symlink_dotl,
789 .unlink = v9fs_vfs_unlink,
790 .mkdir = v9fs_vfs_mkdir_dotl,
791 .rmdir = v9fs_vfs_rmdir,
792 .mknod = v9fs_vfs_mknod_dotl,
793 .rename = v9fs_vfs_rename,
794 .getattr = v9fs_vfs_getattr_dotl,
795 .setattr = v9fs_vfs_setattr_dotl,
796 .setxattr = generic_setxattr,
797 .getxattr = generic_getxattr,
798 .removexattr = generic_removexattr,
799 .listxattr = v9fs_listxattr,
800 .check_acl = v9fs_check_acl,
803 const struct inode_operations v9fs_file_inode_operations_dotl = {
804 .getattr = v9fs_vfs_getattr_dotl,
805 .setattr = v9fs_vfs_setattr_dotl,
806 .setxattr = generic_setxattr,
807 .getxattr = generic_getxattr,
808 .removexattr = generic_removexattr,
809 .listxattr = v9fs_listxattr,
810 .check_acl = v9fs_check_acl,
813 const struct inode_operations v9fs_symlink_inode_operations_dotl = {
814 .readlink = generic_readlink,
815 .follow_link = v9fs_vfs_follow_link_dotl,
816 .put_link = v9fs_vfs_put_link,
817 .getattr = v9fs_vfs_getattr_dotl,
818 .setattr = v9fs_vfs_setattr_dotl,
819 .setxattr = generic_setxattr,
820 .getxattr = generic_getxattr,
821 .removexattr = generic_removexattr,
822 .listxattr = v9fs_listxattr,