1 #include "ceph_debug.h"
3 #include <linux/spinlock.h>
4 #include <linux/fs_struct.h>
5 #include <linux/namei.h>
6 #include <linux/sched.h>
11 * Directory operations: readdir, lookup, create, link, unlink,
16 * Ceph MDS operations are specified in terms of a base ino and
17 * relative path. Thus, the client can specify an operation on a
18 * specific inode (e.g., a getattr due to fstat(2)), or as a path
19 * relative to, say, the root directory.
21 * Normally, we limit ourselves to strict inode ops (no path component)
22 * or dentry operations (a single path component relative to an ino). The
23 * exception to this is open_root_dentry(), which will open the mount
27 const struct inode_operations ceph_dir_iops;
28 const struct file_operations ceph_dir_fops;
29 struct dentry_operations ceph_dentry_ops;
32 * Initialize ceph dentry state.
34 int ceph_init_dentry(struct dentry *dentry)
36 struct ceph_dentry_info *di;
41 if (ceph_snap(dentry->d_parent->d_inode) == CEPH_NOSNAP)
42 dentry->d_op = &ceph_dentry_ops;
43 else if (ceph_snap(dentry->d_parent->d_inode) == CEPH_SNAPDIR)
44 dentry->d_op = &ceph_snapdir_dentry_ops;
46 dentry->d_op = &ceph_snap_dentry_ops;
48 di = kmem_cache_alloc(ceph_dentry_cachep, GFP_NOFS);
50 return -ENOMEM; /* oh well */
52 spin_lock(&dentry->d_lock);
53 if (dentry->d_fsdata) /* lost a race */
56 di->lease_session = NULL;
57 dentry->d_fsdata = di;
58 dentry->d_time = jiffies;
59 ceph_dentry_lru_add(dentry);
61 spin_unlock(&dentry->d_lock);
68 * for readdir, we encode the directory frag and offset within that
71 static unsigned fpos_frag(loff_t p)
75 static unsigned fpos_off(loff_t p)
77 return p & 0xffffffff;
81 * When possible, we try to satisfy a readdir by peeking at the
82 * dcache. We make this work by carefully ordering dentries on
83 * d_u.d_child when we initially get results back from the MDS, and
84 * falling back to a "normal" sync readdir if any dentries in the dir
87 * I_COMPLETE tells indicates we have all dentries in the dir. It is
88 * defined IFF we hold CEPH_CAP_FILE_SHARED (which will be revoked by
89 * the MDS if/when the directory is modified).
91 static int __dcache_readdir(struct file *filp,
92 void *dirent, filldir_t filldir)
94 struct inode *inode = filp->f_dentry->d_inode;
95 struct ceph_file_info *fi = filp->private_data;
96 struct dentry *parent = filp->f_dentry;
97 struct inode *dir = parent->d_inode;
99 struct dentry *dentry, *last;
100 struct ceph_dentry_info *di;
103 /* claim ref on last dentry we returned */
107 dout("__dcache_readdir %p at %llu (last %p)\n", dir, filp->f_pos,
110 spin_lock(&dcache_lock);
112 /* start at beginning? */
113 if (filp->f_pos == 2 || (last &&
114 filp->f_pos < ceph_dentry(last)->offset)) {
115 if (list_empty(&parent->d_subdirs))
117 p = parent->d_subdirs.prev;
118 dout(" initial p %p/%p\n", p->prev, p->next);
120 p = last->d_u.d_child.prev;
124 dentry = list_entry(p, struct dentry, d_u.d_child);
125 di = ceph_dentry(dentry);
127 dout(" p %p/%p d_subdirs %p/%p\n", p->prev, p->next,
128 parent->d_subdirs.prev, parent->d_subdirs.next);
129 if (p == &parent->d_subdirs) {
133 if (!d_unhashed(dentry) && dentry->d_inode &&
134 ceph_snap(dentry->d_inode) != CEPH_SNAPDIR &&
135 ceph_ino(dentry->d_inode) != CEPH_INO_CEPH &&
136 filp->f_pos <= di->offset)
138 dout(" skipping %p %.*s at %llu (%llu)%s%s\n", dentry,
139 dentry->d_name.len, dentry->d_name.name, di->offset,
140 filp->f_pos, d_unhashed(dentry) ? " unhashed" : "",
141 !dentry->d_inode ? " null" : "");
143 dentry = list_entry(p, struct dentry, d_u.d_child);
144 di = ceph_dentry(dentry);
147 atomic_inc(&dentry->d_count);
148 spin_unlock(&dcache_lock);
149 spin_unlock(&inode->i_lock);
151 dout(" %llu (%llu) dentry %p %.*s %p\n", di->offset, filp->f_pos,
152 dentry, dentry->d_name.len, dentry->d_name.name, dentry->d_inode);
153 filp->f_pos = di->offset;
154 err = filldir(dirent, dentry->d_name.name,
155 dentry->d_name.len, di->offset,
156 dentry->d_inode->i_ino,
157 dentry->d_inode->i_mode >> 12);
161 /* remember our position */
163 fi->next_offset = di->offset;
170 spin_lock(&inode->i_lock);
171 spin_lock(&dcache_lock);
181 /* make sure a dentry wasn't dropped while we didn't have dcache_lock */
182 if ((ceph_inode(dir)->i_ceph_flags & CEPH_I_COMPLETE))
184 dout(" lost I_COMPLETE on %p; falling back to mds\n", dir);
188 spin_unlock(&dcache_lock);
191 spin_unlock(&inode->i_lock);
193 spin_lock(&inode->i_lock);
200 * make note of the last dentry we read, so we can
201 * continue at the same lexicographical point,
202 * regardless of what dir changes take place on the
205 static int note_last_dentry(struct ceph_file_info *fi, const char *name,
208 kfree(fi->last_name);
209 fi->last_name = kmalloc(len+1, GFP_NOFS);
212 memcpy(fi->last_name, name, len);
213 fi->last_name[len] = 0;
214 dout("note_last_dentry '%s'\n", fi->last_name);
218 static int ceph_readdir(struct file *filp, void *dirent, filldir_t filldir)
220 struct ceph_file_info *fi = filp->private_data;
221 struct inode *inode = filp->f_dentry->d_inode;
222 struct ceph_inode_info *ci = ceph_inode(inode);
223 struct ceph_client *client = ceph_inode_to_client(inode);
224 struct ceph_mds_client *mdsc = &client->mdsc;
225 unsigned frag = fpos_frag(filp->f_pos);
226 int off = fpos_off(filp->f_pos);
229 struct ceph_mds_reply_info_parsed *rinfo;
230 const int max_entries = client->mount_args->max_readdir;
232 dout("readdir %p filp %p frag %u off %u\n", inode, filp, frag, off);
236 /* always start with . and .. */
237 if (filp->f_pos == 0) {
238 /* note dir version at start of readdir so we can tell
239 * if any dentries get dropped */
240 fi->dir_release_count = ci->i_release_count;
242 dout("readdir off 0 -> '.'\n");
243 if (filldir(dirent, ".", 1, ceph_make_fpos(0, 0),
244 inode->i_ino, inode->i_mode >> 12) < 0)
249 if (filp->f_pos == 1) {
250 dout("readdir off 1 -> '..'\n");
251 if (filldir(dirent, "..", 2, ceph_make_fpos(0, 1),
252 filp->f_dentry->d_parent->d_inode->i_ino,
253 inode->i_mode >> 12) < 0)
259 /* can we use the dcache? */
260 spin_lock(&inode->i_lock);
261 if ((filp->f_pos == 2 || fi->dentry) &&
262 !ceph_test_opt(client, NOASYNCREADDIR) &&
263 (ci->i_ceph_flags & CEPH_I_COMPLETE) &&
264 __ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1)) {
265 err = __dcache_readdir(filp, dirent, filldir);
266 if (err != -EAGAIN) {
267 spin_unlock(&inode->i_lock);
271 spin_unlock(&inode->i_lock);
273 err = note_last_dentry(fi, fi->dentry->d_name.name,
274 fi->dentry->d_name.len);
281 /* proceed with a normal readdir */
284 /* do we have the correct frag content buffered? */
285 if (fi->frag != frag || fi->last_readdir == NULL) {
286 struct ceph_mds_request *req;
287 int op = ceph_snap(inode) == CEPH_SNAPDIR ?
288 CEPH_MDS_OP_LSSNAP : CEPH_MDS_OP_READDIR;
290 /* discard old result, if any */
291 if (fi->last_readdir)
292 ceph_mdsc_put_request(fi->last_readdir);
294 /* requery frag tree, as the frag topology may have changed */
295 frag = ceph_choose_frag(ceph_inode(inode), frag, NULL, NULL);
297 dout("readdir fetching %llx.%llx frag %x offset '%s'\n",
298 ceph_vinop(inode), frag, fi->last_name);
299 req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS);
302 req->r_inode = igrab(inode);
303 req->r_dentry = dget(filp->f_dentry);
304 /* hints to request -> mds selection code */
305 req->r_direct_mode = USE_AUTH_MDS;
306 req->r_direct_hash = ceph_frag_value(frag);
307 req->r_direct_is_hash = true;
308 req->r_path2 = kstrdup(fi->last_name, GFP_NOFS);
309 req->r_readdir_offset = fi->next_offset;
310 req->r_args.readdir.frag = cpu_to_le32(frag);
311 req->r_args.readdir.max_entries = cpu_to_le32(max_entries);
312 req->r_num_caps = max_entries;
313 err = ceph_mdsc_do_request(mdsc, NULL, req);
315 ceph_mdsc_put_request(req);
318 dout("readdir got and parsed readdir result=%d"
319 " on frag %x, end=%d, complete=%d\n", err, frag,
320 (int)req->r_reply_info.dir_end,
321 (int)req->r_reply_info.dir_complete);
323 if (!req->r_did_prepopulate) {
324 dout("readdir !did_prepopulate");
325 fi->dir_release_count--; /* preclude I_COMPLETE */
328 /* note next offset and last dentry name */
329 fi->offset = fi->next_offset;
330 fi->last_readdir = req;
332 if (req->r_reply_info.dir_end) {
333 kfree(fi->last_name);
334 fi->last_name = NULL;
337 rinfo = &req->r_reply_info;
338 err = note_last_dentry(fi,
339 rinfo->dir_dname[rinfo->dir_nr-1],
340 rinfo->dir_dname_len[rinfo->dir_nr-1]);
343 fi->next_offset += rinfo->dir_nr;
347 rinfo = &fi->last_readdir->r_reply_info;
348 dout("readdir frag %x num %d off %d chunkoff %d\n", frag,
349 rinfo->dir_nr, off, fi->offset);
350 while (off - fi->offset >= 0 && off - fi->offset < rinfo->dir_nr) {
351 u64 pos = ceph_make_fpos(frag, off);
352 struct ceph_mds_reply_inode *in =
353 rinfo->dir_in[off - fi->offset].in;
354 dout("readdir off %d (%d/%d) -> %lld '%.*s' %p\n",
355 off, off - fi->offset, rinfo->dir_nr, pos,
356 rinfo->dir_dname_len[off - fi->offset],
357 rinfo->dir_dname[off - fi->offset], in);
359 ftype = le32_to_cpu(in->mode) >> 12;
361 rinfo->dir_dname[off - fi->offset],
362 rinfo->dir_dname_len[off - fi->offset],
364 le64_to_cpu(in->ino),
366 dout("filldir stopping us...\n");
370 filp->f_pos = pos + 1;
374 ceph_mdsc_put_request(fi->last_readdir);
375 fi->last_readdir = NULL;
380 if (!ceph_frag_is_rightmost(frag)) {
381 frag = ceph_frag_next(frag);
383 filp->f_pos = ceph_make_fpos(frag, off);
384 dout("readdir next frag is %x\n", frag);
390 * if dir_release_count still matches the dir, no dentries
391 * were released during the whole readdir, and we should have
392 * the complete dir contents in our cache.
394 spin_lock(&inode->i_lock);
395 if (ci->i_release_count == fi->dir_release_count) {
396 dout(" marking %p complete\n", inode);
397 ci->i_ceph_flags |= CEPH_I_COMPLETE;
398 ci->i_max_offset = filp->f_pos;
400 spin_unlock(&inode->i_lock);
402 dout("readdir %p filp %p done.\n", inode, filp);
406 static void reset_readdir(struct ceph_file_info *fi)
408 if (fi->last_readdir) {
409 ceph_mdsc_put_request(fi->last_readdir);
410 fi->last_readdir = NULL;
412 kfree(fi->last_name);
413 fi->next_offset = 2; /* compensate for . and .. */
421 static loff_t ceph_dir_llseek(struct file *file, loff_t offset, int origin)
423 struct ceph_file_info *fi = file->private_data;
424 struct inode *inode = file->f_mapping->host;
425 loff_t old_offset = offset;
428 mutex_lock(&inode->i_mutex);
431 offset += inode->i_size + 2; /* FIXME */
434 offset += file->f_pos;
437 if (offset >= 0 && offset <= inode->i_sb->s_maxbytes) {
438 if (offset != file->f_pos) {
439 file->f_pos = offset;
446 * discard buffered readdir content on seekdir(0), or
447 * seek to new frag, or seek prior to current chunk.
450 fpos_frag(offset) != fpos_frag(old_offset) ||
451 fpos_off(offset) < fi->offset) {
452 dout("dir_llseek dropping %p content\n", file);
456 /* bump dir_release_count if we did a forward seek */
457 if (offset > old_offset)
458 fi->dir_release_count--;
460 mutex_unlock(&inode->i_mutex);
465 * Process result of a lookup/open request.
467 * Mainly, make sure we return the final req->r_dentry (if it already
468 * existed) in place of the original VFS-provided dentry when they
471 * Gracefully handle the case where the MDS replies with -ENOENT and
472 * no trace (which it may do, at its discretion, e.g., if it doesn't
473 * care to issue a lease on the negative dentry).
475 struct dentry *ceph_finish_lookup(struct ceph_mds_request *req,
476 struct dentry *dentry, int err)
478 struct ceph_client *client = ceph_client(dentry->d_sb);
479 struct inode *parent = dentry->d_parent->d_inode;
482 if (err == -ENOENT &&
483 ceph_vino(parent).ino != CEPH_INO_ROOT && /* no .snap in root dir */
484 strcmp(dentry->d_name.name,
485 client->mount_args->snapdir_name) == 0) {
486 struct inode *inode = ceph_get_snapdir(parent);
487 dout("ENOENT on snapdir %p '%.*s', linking to snapdir %p\n",
488 dentry, dentry->d_name.len, dentry->d_name.name, inode);
489 d_add(dentry, inode);
493 if (err == -ENOENT) {
496 if (!req->r_reply_info.head->is_dentry) {
497 dout("ENOENT and no trace, dentry %p inode %p\n",
498 dentry, dentry->d_inode);
499 if (dentry->d_inode) {
508 dentry = ERR_PTR(err);
509 else if (dentry != req->r_dentry)
510 dentry = dget(req->r_dentry); /* we got spliced */
516 static int is_root_ceph_dentry(struct inode *inode, struct dentry *dentry)
518 return ceph_ino(inode) == CEPH_INO_ROOT &&
519 strncmp(dentry->d_name.name, ".ceph", 5) == 0;
523 * Look up a single dir entry. If there is a lookup intent, inform
524 * the MDS so that it gets our 'caps wanted' value in a single op.
526 static struct dentry *ceph_lookup(struct inode *dir, struct dentry *dentry,
527 struct nameidata *nd)
529 struct ceph_client *client = ceph_sb_to_client(dir->i_sb);
530 struct ceph_mds_client *mdsc = &client->mdsc;
531 struct ceph_mds_request *req;
535 dout("lookup %p dentry %p '%.*s'\n",
536 dir, dentry, dentry->d_name.len, dentry->d_name.name);
538 if (dentry->d_name.len > NAME_MAX)
539 return ERR_PTR(-ENAMETOOLONG);
541 err = ceph_init_dentry(dentry);
545 /* open (but not create!) intent? */
547 (nd->flags & LOOKUP_OPEN) &&
548 (nd->flags & LOOKUP_CONTINUE) == 0 && /* only open last component */
549 !(nd->intent.open.flags & O_CREAT)) {
550 int mode = nd->intent.open.create_mode & ~current->fs->umask;
551 return ceph_lookup_open(dir, dentry, nd, mode, 1);
554 /* can we conclude ENOENT locally? */
555 if (dentry->d_inode == NULL) {
556 struct ceph_inode_info *ci = ceph_inode(dir);
557 struct ceph_dentry_info *di = ceph_dentry(dentry);
559 spin_lock(&dir->i_lock);
560 dout(" dir %p flags are %d\n", dir, ci->i_ceph_flags);
561 if (strncmp(dentry->d_name.name,
562 client->mount_args->snapdir_name,
563 dentry->d_name.len) &&
564 !is_root_ceph_dentry(dir, dentry) &&
565 (ci->i_ceph_flags & CEPH_I_COMPLETE) &&
566 (__ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1))) {
567 di->offset = ci->i_max_offset++;
568 spin_unlock(&dir->i_lock);
569 dout(" dir %p complete, -ENOENT\n", dir);
571 di->lease_shared_gen = ci->i_shared_gen;
574 spin_unlock(&dir->i_lock);
577 op = ceph_snap(dir) == CEPH_SNAPDIR ?
578 CEPH_MDS_OP_LOOKUPSNAP : CEPH_MDS_OP_LOOKUP;
579 req = ceph_mdsc_create_request(mdsc, op, USE_ANY_MDS);
581 return ERR_PTR(PTR_ERR(req));
582 req->r_dentry = dget(dentry);
584 /* we only need inode linkage */
585 req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INODE);
586 req->r_locked_dir = dir;
587 err = ceph_mdsc_do_request(mdsc, NULL, req);
588 dentry = ceph_finish_lookup(req, dentry, err);
589 ceph_mdsc_put_request(req); /* will dput(dentry) */
590 dout("lookup result=%p\n", dentry);
595 * If we do a create but get no trace back from the MDS, follow up with
596 * a lookup (the VFS expects us to link up the provided dentry).
598 int ceph_handle_notrace_create(struct inode *dir, struct dentry *dentry)
600 struct dentry *result = ceph_lookup(dir, dentry, NULL);
602 if (result && !IS_ERR(result)) {
604 * We created the item, then did a lookup, and found
605 * it was already linked to another inode we already
606 * had in our cache (and thus got spliced). Link our
607 * dentry to that inode, but don't hash it, just in
608 * case the VFS wants to dereference it.
610 BUG_ON(!result->d_inode);
611 d_instantiate(dentry, result->d_inode);
614 return PTR_ERR(result);
617 static int ceph_mknod(struct inode *dir, struct dentry *dentry,
618 int mode, dev_t rdev)
620 struct ceph_client *client = ceph_sb_to_client(dir->i_sb);
621 struct ceph_mds_client *mdsc = &client->mdsc;
622 struct ceph_mds_request *req;
625 if (ceph_snap(dir) != CEPH_NOSNAP)
628 dout("mknod in dir %p dentry %p mode 0%o rdev %d\n",
629 dir, dentry, mode, rdev);
630 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_MKNOD, USE_AUTH_MDS);
635 req->r_dentry = dget(dentry);
637 req->r_locked_dir = dir;
638 req->r_args.mknod.mode = cpu_to_le32(mode);
639 req->r_args.mknod.rdev = cpu_to_le32(rdev);
640 req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
641 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
642 err = ceph_mdsc_do_request(mdsc, dir, req);
643 if (!err && !req->r_reply_info.head->is_dentry)
644 err = ceph_handle_notrace_create(dir, dentry);
645 ceph_mdsc_put_request(req);
651 static int ceph_create(struct inode *dir, struct dentry *dentry, int mode,
652 struct nameidata *nd)
654 dout("create in dir %p dentry %p name '%.*s'\n",
655 dir, dentry, dentry->d_name.len, dentry->d_name.name);
657 if (ceph_snap(dir) != CEPH_NOSNAP)
661 BUG_ON((nd->flags & LOOKUP_OPEN) == 0);
662 dentry = ceph_lookup_open(dir, dentry, nd, mode, 0);
663 /* hrm, what should i do here if we get aliased? */
665 return PTR_ERR(dentry);
669 /* fall back to mknod */
670 return ceph_mknod(dir, dentry, (mode & ~S_IFMT) | S_IFREG, 0);
673 static int ceph_symlink(struct inode *dir, struct dentry *dentry,
676 struct ceph_client *client = ceph_sb_to_client(dir->i_sb);
677 struct ceph_mds_client *mdsc = &client->mdsc;
678 struct ceph_mds_request *req;
681 if (ceph_snap(dir) != CEPH_NOSNAP)
684 dout("symlink in dir %p dentry %p to '%s'\n", dir, dentry, dest);
685 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SYMLINK, USE_AUTH_MDS);
690 req->r_dentry = dget(dentry);
692 req->r_path2 = kstrdup(dest, GFP_NOFS);
693 req->r_locked_dir = dir;
694 req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
695 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
696 err = ceph_mdsc_do_request(mdsc, dir, req);
697 if (!err && !req->r_reply_info.head->is_dentry)
698 err = ceph_handle_notrace_create(dir, dentry);
699 ceph_mdsc_put_request(req);
705 static int ceph_mkdir(struct inode *dir, struct dentry *dentry, int mode)
707 struct ceph_client *client = ceph_sb_to_client(dir->i_sb);
708 struct ceph_mds_client *mdsc = &client->mdsc;
709 struct ceph_mds_request *req;
713 if (ceph_snap(dir) == CEPH_SNAPDIR) {
714 /* mkdir .snap/foo is a MKSNAP */
715 op = CEPH_MDS_OP_MKSNAP;
716 dout("mksnap dir %p snap '%.*s' dn %p\n", dir,
717 dentry->d_name.len, dentry->d_name.name, dentry);
718 } else if (ceph_snap(dir) == CEPH_NOSNAP) {
719 dout("mkdir dir %p dn %p mode 0%o\n", dir, dentry, mode);
720 op = CEPH_MDS_OP_MKDIR;
724 req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS);
730 req->r_dentry = dget(dentry);
732 req->r_locked_dir = dir;
733 req->r_args.mkdir.mode = cpu_to_le32(mode);
734 req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
735 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
736 err = ceph_mdsc_do_request(mdsc, dir, req);
737 if (!err && !req->r_reply_info.head->is_dentry)
738 err = ceph_handle_notrace_create(dir, dentry);
739 ceph_mdsc_put_request(req);
746 static int ceph_link(struct dentry *old_dentry, struct inode *dir,
747 struct dentry *dentry)
749 struct ceph_client *client = ceph_sb_to_client(dir->i_sb);
750 struct ceph_mds_client *mdsc = &client->mdsc;
751 struct ceph_mds_request *req;
754 if (ceph_snap(dir) != CEPH_NOSNAP)
757 dout("link in dir %p old_dentry %p dentry %p\n", dir,
759 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_LINK, USE_AUTH_MDS);
764 req->r_dentry = dget(dentry);
766 req->r_old_dentry = dget(old_dentry); /* or inode? hrm. */
767 req->r_locked_dir = dir;
768 req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
769 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
770 err = ceph_mdsc_do_request(mdsc, dir, req);
773 else if (!req->r_reply_info.head->is_dentry)
774 d_instantiate(dentry, igrab(old_dentry->d_inode));
775 ceph_mdsc_put_request(req);
780 * For a soon-to-be unlinked file, drop the AUTH_RDCACHE caps. If it
781 * looks like the link count will hit 0, drop any other caps (other
782 * than PIN) we don't specifically want (due to the file still being
785 static int drop_caps_for_unlink(struct inode *inode)
787 struct ceph_inode_info *ci = ceph_inode(inode);
788 int drop = CEPH_CAP_LINK_SHARED | CEPH_CAP_LINK_EXCL;
790 spin_lock(&inode->i_lock);
791 if (inode->i_nlink == 1) {
792 drop |= ~(__ceph_caps_wanted(ci) | CEPH_CAP_PIN);
793 ci->i_ceph_flags |= CEPH_I_NODELAY;
795 spin_unlock(&inode->i_lock);
800 * rmdir and unlink are differ only by the metadata op code
802 static int ceph_unlink(struct inode *dir, struct dentry *dentry)
804 struct ceph_client *client = ceph_sb_to_client(dir->i_sb);
805 struct ceph_mds_client *mdsc = &client->mdsc;
806 struct inode *inode = dentry->d_inode;
807 struct ceph_mds_request *req;
811 if (ceph_snap(dir) == CEPH_SNAPDIR) {
812 /* rmdir .snap/foo is RMSNAP */
813 dout("rmsnap dir %p '%.*s' dn %p\n", dir, dentry->d_name.len,
814 dentry->d_name.name, dentry);
815 op = CEPH_MDS_OP_RMSNAP;
816 } else if (ceph_snap(dir) == CEPH_NOSNAP) {
817 dout("unlink/rmdir dir %p dn %p inode %p\n",
819 op = ((dentry->d_inode->i_mode & S_IFMT) == S_IFDIR) ?
820 CEPH_MDS_OP_RMDIR : CEPH_MDS_OP_UNLINK;
823 req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS);
828 req->r_dentry = dget(dentry);
830 req->r_locked_dir = dir;
831 req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
832 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
833 req->r_inode_drop = drop_caps_for_unlink(inode);
834 err = ceph_mdsc_do_request(mdsc, dir, req);
835 if (!err && !req->r_reply_info.head->is_dentry)
837 ceph_mdsc_put_request(req);
842 static int ceph_rename(struct inode *old_dir, struct dentry *old_dentry,
843 struct inode *new_dir, struct dentry *new_dentry)
845 struct ceph_client *client = ceph_sb_to_client(old_dir->i_sb);
846 struct ceph_mds_client *mdsc = &client->mdsc;
847 struct ceph_mds_request *req;
850 if (ceph_snap(old_dir) != ceph_snap(new_dir))
852 if (ceph_snap(old_dir) != CEPH_NOSNAP ||
853 ceph_snap(new_dir) != CEPH_NOSNAP)
855 dout("rename dir %p dentry %p to dir %p dentry %p\n",
856 old_dir, old_dentry, new_dir, new_dentry);
857 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_RENAME, USE_AUTH_MDS);
860 req->r_dentry = dget(new_dentry);
862 req->r_old_dentry = dget(old_dentry);
863 req->r_locked_dir = new_dir;
864 req->r_old_dentry_drop = CEPH_CAP_FILE_SHARED;
865 req->r_old_dentry_unless = CEPH_CAP_FILE_EXCL;
866 req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
867 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
868 /* release LINK_RDCACHE on source inode (mds will lock it) */
869 req->r_old_inode_drop = CEPH_CAP_LINK_SHARED;
870 if (new_dentry->d_inode)
871 req->r_inode_drop = drop_caps_for_unlink(new_dentry->d_inode);
872 err = ceph_mdsc_do_request(mdsc, old_dir, req);
873 if (!err && !req->r_reply_info.head->is_dentry) {
875 * Normally d_move() is done by fill_trace (called by
876 * do_request, above). If there is no trace, we need
879 d_move(old_dentry, new_dentry);
881 ceph_mdsc_put_request(req);
887 * Check if dentry lease is valid. If not, delete the lease. Try to
888 * renew if the least is more than half up.
890 static int dentry_lease_is_valid(struct dentry *dentry)
892 struct ceph_dentry_info *di;
893 struct ceph_mds_session *s;
897 struct ceph_mds_session *session = NULL;
898 struct inode *dir = NULL;
901 spin_lock(&dentry->d_lock);
902 di = ceph_dentry(dentry);
903 if (di && di->lease_session) {
904 s = di->lease_session;
905 spin_lock(&s->s_cap_lock);
908 spin_unlock(&s->s_cap_lock);
910 if (di->lease_gen == gen &&
911 time_before(jiffies, dentry->d_time) &&
912 time_before(jiffies, ttl)) {
914 if (di->lease_renew_after &&
915 time_after(jiffies, di->lease_renew_after)) {
916 /* we should renew */
917 dir = dentry->d_parent->d_inode;
918 session = ceph_get_mds_session(s);
920 di->lease_renew_after = 0;
921 di->lease_renew_from = jiffies;
925 spin_unlock(&dentry->d_lock);
928 ceph_mdsc_lease_send_msg(session, dir, dentry,
929 CEPH_MDS_LEASE_RENEW, seq);
930 ceph_put_mds_session(session);
932 dout("dentry_lease_is_valid - dentry %p = %d\n", dentry, valid);
937 * Check if directory-wide content lease/cap is valid.
939 static int dir_lease_is_valid(struct inode *dir, struct dentry *dentry)
941 struct ceph_inode_info *ci = ceph_inode(dir);
942 struct ceph_dentry_info *di = ceph_dentry(dentry);
945 spin_lock(&dir->i_lock);
946 if (ci->i_shared_gen == di->lease_shared_gen)
947 valid = __ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1);
948 spin_unlock(&dir->i_lock);
949 dout("dir_lease_is_valid dir %p v%u dentry %p v%u = %d\n",
950 dir, (unsigned)ci->i_shared_gen, dentry,
951 (unsigned)di->lease_shared_gen, valid);
956 * Check if cached dentry can be trusted.
958 static int ceph_d_revalidate(struct dentry *dentry, struct nameidata *nd)
960 struct inode *dir = dentry->d_parent->d_inode;
962 dout("d_revalidate %p '%.*s' inode %p\n", dentry,
963 dentry->d_name.len, dentry->d_name.name, dentry->d_inode);
965 /* always trust cached snapped dentries, snapdir dentry */
966 if (ceph_snap(dir) != CEPH_NOSNAP) {
967 dout("d_revalidate %p '%.*s' inode %p is SNAPPED\n", dentry,
968 dentry->d_name.len, dentry->d_name.name, dentry->d_inode);
971 if (dentry->d_inode && ceph_snap(dentry->d_inode) == CEPH_SNAPDIR)
974 if (dentry_lease_is_valid(dentry) ||
975 dir_lease_is_valid(dir, dentry))
978 dout("d_revalidate %p invalid\n", dentry);
982 ceph_dentry_lru_touch(dentry);
987 * When a dentry is released, clear the dir I_COMPLETE if it was part
988 * of the current dir gen.
990 static void ceph_dentry_release(struct dentry *dentry)
992 struct ceph_dentry_info *di = ceph_dentry(dentry);
993 struct inode *parent_inode = dentry->d_parent->d_inode;
996 struct ceph_inode_info *ci = ceph_inode(parent_inode);
998 spin_lock(&parent_inode->i_lock);
999 if (ci->i_shared_gen == di->lease_shared_gen) {
1000 dout(" clearing %p complete (d_release)\n",
1002 ci->i_ceph_flags &= ~CEPH_I_COMPLETE;
1003 ci->i_release_count++;
1005 spin_unlock(&parent_inode->i_lock);
1008 ceph_dentry_lru_del(dentry);
1009 if (di->lease_session)
1010 ceph_put_mds_session(di->lease_session);
1011 kmem_cache_free(ceph_dentry_cachep, di);
1012 dentry->d_fsdata = NULL;
1016 static int ceph_snapdir_d_revalidate(struct dentry *dentry,
1017 struct nameidata *nd)
1020 * Eventually, we'll want to revalidate snapped metadata
1021 * too... probably...
1029 * read() on a dir. This weird interface hack only works if mounted
1030 * with '-o dirstat'.
1032 static ssize_t ceph_read_dir(struct file *file, char __user *buf, size_t size,
1035 struct ceph_file_info *cf = file->private_data;
1036 struct inode *inode = file->f_dentry->d_inode;
1037 struct ceph_inode_info *ci = ceph_inode(inode);
1040 if (!ceph_test_opt(ceph_client(inode->i_sb), DIRSTAT))
1043 if (!cf->dir_info) {
1044 cf->dir_info = kmalloc(1024, GFP_NOFS);
1048 sprintf(cf->dir_info,
1051 " subdirs: %20lld\n"
1052 "rentries: %20lld\n"
1054 " rsubdirs: %20lld\n"
1056 "rctime: %10ld.%09ld\n",
1057 ci->i_files + ci->i_subdirs,
1060 ci->i_rfiles + ci->i_rsubdirs,
1064 (long)ci->i_rctime.tv_sec,
1065 (long)ci->i_rctime.tv_nsec);
1068 if (*ppos >= cf->dir_info_len)
1070 size = min_t(unsigned, size, cf->dir_info_len-*ppos);
1071 left = copy_to_user(buf, cf->dir_info + *ppos, size);
1074 *ppos += (size - left);
1079 * an fsync() on a dir will wait for any uncommitted directory
1080 * operations to commit.
1082 static int ceph_dir_fsync(struct file *file, struct dentry *dentry,
1085 struct inode *inode = dentry->d_inode;
1086 struct ceph_inode_info *ci = ceph_inode(inode);
1087 struct list_head *head = &ci->i_unsafe_dirops;
1088 struct ceph_mds_request *req;
1092 dout("dir_fsync %p\n", inode);
1093 spin_lock(&ci->i_unsafe_lock);
1094 if (list_empty(head))
1097 req = list_entry(head->prev,
1098 struct ceph_mds_request, r_unsafe_dir_item);
1099 last_tid = req->r_tid;
1102 ceph_mdsc_get_request(req);
1103 spin_unlock(&ci->i_unsafe_lock);
1104 dout("dir_fsync %p wait on tid %llu (until %llu)\n",
1105 inode, req->r_tid, last_tid);
1106 if (req->r_timeout) {
1107 ret = wait_for_completion_timeout(
1108 &req->r_safe_completion, req->r_timeout);
1112 ret = -EIO; /* timed out */
1114 wait_for_completion(&req->r_safe_completion);
1116 spin_lock(&ci->i_unsafe_lock);
1117 ceph_mdsc_put_request(req);
1119 if (ret || list_empty(head))
1121 req = list_entry(head->next,
1122 struct ceph_mds_request, r_unsafe_dir_item);
1123 } while (req->r_tid < last_tid);
1125 spin_unlock(&ci->i_unsafe_lock);
1130 * We maintain a private dentry LRU.
1132 * FIXME: this needs to be changed to a per-mds lru to be useful.
1134 void ceph_dentry_lru_add(struct dentry *dn)
1136 struct ceph_dentry_info *di = ceph_dentry(dn);
1137 struct ceph_mds_client *mdsc;
1139 dout("dentry_lru_add %p %p '%.*s'\n", di, dn,
1140 dn->d_name.len, dn->d_name.name);
1142 mdsc = &ceph_client(dn->d_sb)->mdsc;
1143 spin_lock(&mdsc->dentry_lru_lock);
1144 list_add_tail(&di->lru, &mdsc->dentry_lru);
1146 spin_unlock(&mdsc->dentry_lru_lock);
1150 void ceph_dentry_lru_touch(struct dentry *dn)
1152 struct ceph_dentry_info *di = ceph_dentry(dn);
1153 struct ceph_mds_client *mdsc;
1155 dout("dentry_lru_touch %p %p '%.*s'\n", di, dn,
1156 dn->d_name.len, dn->d_name.name);
1158 mdsc = &ceph_client(dn->d_sb)->mdsc;
1159 spin_lock(&mdsc->dentry_lru_lock);
1160 list_move_tail(&di->lru, &mdsc->dentry_lru);
1161 spin_unlock(&mdsc->dentry_lru_lock);
1165 void ceph_dentry_lru_del(struct dentry *dn)
1167 struct ceph_dentry_info *di = ceph_dentry(dn);
1168 struct ceph_mds_client *mdsc;
1170 dout("dentry_lru_del %p %p '%.*s'\n", di, dn,
1171 dn->d_name.len, dn->d_name.name);
1173 mdsc = &ceph_client(dn->d_sb)->mdsc;
1174 spin_lock(&mdsc->dentry_lru_lock);
1175 list_del_init(&di->lru);
1177 spin_unlock(&mdsc->dentry_lru_lock);
1181 const struct file_operations ceph_dir_fops = {
1182 .read = ceph_read_dir,
1183 .readdir = ceph_readdir,
1184 .llseek = ceph_dir_llseek,
1186 .release = ceph_release,
1187 .unlocked_ioctl = ceph_ioctl,
1188 .fsync = ceph_dir_fsync,
1191 const struct inode_operations ceph_dir_iops = {
1192 .lookup = ceph_lookup,
1193 .permission = ceph_permission,
1194 .getattr = ceph_getattr,
1195 .setattr = ceph_setattr,
1196 .setxattr = ceph_setxattr,
1197 .getxattr = ceph_getxattr,
1198 .listxattr = ceph_listxattr,
1199 .removexattr = ceph_removexattr,
1200 .mknod = ceph_mknod,
1201 .symlink = ceph_symlink,
1202 .mkdir = ceph_mkdir,
1204 .unlink = ceph_unlink,
1205 .rmdir = ceph_unlink,
1206 .rename = ceph_rename,
1207 .create = ceph_create,
1210 struct dentry_operations ceph_dentry_ops = {
1211 .d_revalidate = ceph_d_revalidate,
1212 .d_release = ceph_dentry_release,
1215 struct dentry_operations ceph_snapdir_dentry_ops = {
1216 .d_revalidate = ceph_snapdir_d_revalidate,
1219 struct dentry_operations ceph_snap_dentry_ops = {