1 #include <linux/ceph/ceph_debug.h>
3 #include <linux/spinlock.h>
4 #include <linux/fs_struct.h>
5 #include <linux/namei.h>
6 #include <linux/slab.h>
7 #include <linux/sched.h>
10 #include "mds_client.h"
13 * Directory operations: readdir, lookup, create, link, unlink,
18 * Ceph MDS operations are specified in terms of a base ino and
19 * relative path. Thus, the client can specify an operation on a
20 * specific inode (e.g., a getattr due to fstat(2)), or as a path
21 * relative to, say, the root directory.
23 * Normally, we limit ourselves to strict inode ops (no path component)
24 * or dentry operations (a single path component relative to an ino). The
25 * exception to this is open_root_dentry(), which will open the mount
29 const struct inode_operations ceph_dir_iops;
30 const struct file_operations ceph_dir_fops;
31 const struct dentry_operations ceph_dentry_ops;
34 * Initialize ceph dentry state.
36 int ceph_init_dentry(struct dentry *dentry)
38 struct ceph_dentry_info *di;
43 di = kmem_cache_alloc(ceph_dentry_cachep, GFP_NOFS | __GFP_ZERO);
45 return -ENOMEM; /* oh well */
47 spin_lock(&dentry->d_lock);
48 if (dentry->d_fsdata) {
50 kmem_cache_free(ceph_dentry_cachep, di);
54 if (ceph_snap(dentry->d_parent->d_inode) == CEPH_NOSNAP)
55 d_set_d_op(dentry, &ceph_dentry_ops);
56 else if (ceph_snap(dentry->d_parent->d_inode) == CEPH_SNAPDIR)
57 d_set_d_op(dentry, &ceph_snapdir_dentry_ops);
59 d_set_d_op(dentry, &ceph_snap_dentry_ops);
62 di->lease_session = NULL;
63 dentry->d_time = jiffies;
64 /* avoid reordering d_fsdata setup so that the check above is safe */
66 dentry->d_fsdata = di;
67 ceph_dentry_lru_add(dentry);
69 spin_unlock(&dentry->d_lock);
73 struct inode *ceph_get_dentry_parent_inode(struct dentry *dentry)
75 struct inode *inode = NULL;
80 spin_lock(&dentry->d_lock);
81 if (!IS_ROOT(dentry)) {
82 inode = dentry->d_parent->d_inode;
85 spin_unlock(&dentry->d_lock);
91 * for readdir, we encode the directory frag and offset within that
94 static unsigned fpos_frag(loff_t p)
98 static unsigned fpos_off(loff_t p)
100 return p & 0xffffffff;
104 * When possible, we try to satisfy a readdir by peeking at the
105 * dcache. We make this work by carefully ordering dentries on
106 * d_u.d_child when we initially get results back from the MDS, and
107 * falling back to a "normal" sync readdir if any dentries in the dir
110 * D_COMPLETE tells indicates we have all dentries in the dir. It is
111 * defined IFF we hold CEPH_CAP_FILE_SHARED (which will be revoked by
112 * the MDS if/when the directory is modified).
114 static int __dcache_readdir(struct file *filp,
115 void *dirent, filldir_t filldir)
117 struct ceph_file_info *fi = filp->private_data;
118 struct dentry *parent = filp->f_dentry;
119 struct inode *dir = parent->d_inode;
121 struct dentry *dentry, *last;
122 struct ceph_dentry_info *di;
125 /* claim ref on last dentry we returned */
129 dout("__dcache_readdir %p at %llu (last %p)\n", dir, filp->f_pos,
132 spin_lock(&parent->d_lock);
134 /* start at beginning? */
135 if (filp->f_pos == 2 || last == NULL ||
136 filp->f_pos < ceph_dentry(last)->offset) {
137 if (list_empty(&parent->d_subdirs))
139 p = parent->d_subdirs.prev;
140 dout(" initial p %p/%p\n", p->prev, p->next);
142 p = last->d_u.d_child.prev;
146 dentry = list_entry(p, struct dentry, d_u.d_child);
147 di = ceph_dentry(dentry);
149 dout(" p %p/%p %s d_subdirs %p/%p\n", p->prev, p->next,
150 d_unhashed(dentry) ? "!hashed" : "hashed",
151 parent->d_subdirs.prev, parent->d_subdirs.next);
152 if (p == &parent->d_subdirs) {
153 fi->flags |= CEPH_F_ATEND;
156 spin_lock_nested(&dentry->d_lock, DENTRY_D_LOCK_NESTED);
157 if (!d_unhashed(dentry) && dentry->d_inode &&
158 ceph_snap(dentry->d_inode) != CEPH_SNAPDIR &&
159 ceph_ino(dentry->d_inode) != CEPH_INO_CEPH &&
160 filp->f_pos <= di->offset)
162 dout(" skipping %p %.*s at %llu (%llu)%s%s\n", dentry,
163 dentry->d_name.len, dentry->d_name.name, di->offset,
164 filp->f_pos, d_unhashed(dentry) ? " unhashed" : "",
165 !dentry->d_inode ? " null" : "");
166 spin_unlock(&dentry->d_lock);
168 dentry = list_entry(p, struct dentry, d_u.d_child);
169 di = ceph_dentry(dentry);
173 spin_unlock(&dentry->d_lock);
174 spin_unlock(&parent->d_lock);
176 dout(" %llu (%llu) dentry %p %.*s %p\n", di->offset, filp->f_pos,
177 dentry, dentry->d_name.len, dentry->d_name.name, dentry->d_inode);
178 filp->f_pos = di->offset;
179 err = filldir(dirent, dentry->d_name.name,
180 dentry->d_name.len, di->offset,
181 ceph_translate_ino(dentry->d_sb, dentry->d_inode->i_ino),
182 dentry->d_inode->i_mode >> 12);
186 /* remember our position */
188 fi->next_offset = di->offset;
200 /* make sure a dentry wasn't dropped while we didn't have parent lock */
201 if (!ceph_dir_test_complete(dir)) {
202 dout(" lost D_COMPLETE on %p; falling back to mds\n", dir);
207 spin_lock(&parent->d_lock);
208 p = p->prev; /* advance to next dentry */
212 spin_unlock(&parent->d_lock);
220 * make note of the last dentry we read, so we can
221 * continue at the same lexicographical point,
222 * regardless of what dir changes take place on the
225 static int note_last_dentry(struct ceph_file_info *fi, const char *name,
228 kfree(fi->last_name);
229 fi->last_name = kmalloc(len+1, GFP_NOFS);
232 memcpy(fi->last_name, name, len);
233 fi->last_name[len] = 0;
234 dout("note_last_dentry '%s'\n", fi->last_name);
238 static int ceph_readdir(struct file *filp, void *dirent, filldir_t filldir)
240 struct ceph_file_info *fi = filp->private_data;
241 struct inode *inode = filp->f_dentry->d_inode;
242 struct ceph_inode_info *ci = ceph_inode(inode);
243 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
244 struct ceph_mds_client *mdsc = fsc->mdsc;
245 unsigned frag = fpos_frag(filp->f_pos);
246 int off = fpos_off(filp->f_pos);
249 struct ceph_mds_reply_info_parsed *rinfo;
250 const int max_entries = fsc->mount_options->max_readdir;
251 const int max_bytes = fsc->mount_options->max_readdir_bytes;
253 dout("readdir %p filp %p frag %u off %u\n", inode, filp, frag, off);
254 if (fi->flags & CEPH_F_ATEND)
257 /* always start with . and .. */
258 if (filp->f_pos == 0) {
259 /* note dir version at start of readdir so we can tell
260 * if any dentries get dropped */
261 fi->dir_release_count = ci->i_release_count;
263 dout("readdir off 0 -> '.'\n");
264 if (filldir(dirent, ".", 1, ceph_make_fpos(0, 0),
265 ceph_translate_ino(inode->i_sb, inode->i_ino),
266 inode->i_mode >> 12) < 0)
271 if (filp->f_pos == 1) {
272 ino_t ino = parent_ino(filp->f_dentry);
273 dout("readdir off 1 -> '..'\n");
274 if (filldir(dirent, "..", 2, ceph_make_fpos(0, 1),
275 ceph_translate_ino(inode->i_sb, ino),
276 inode->i_mode >> 12) < 0)
282 /* can we use the dcache? */
283 spin_lock(&ci->i_ceph_lock);
284 if ((filp->f_pos == 2 || fi->dentry) &&
285 !ceph_test_mount_opt(fsc, NOASYNCREADDIR) &&
286 ceph_snap(inode) != CEPH_SNAPDIR &&
287 ceph_dir_test_complete(inode) &&
288 __ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1)) {
289 spin_unlock(&ci->i_ceph_lock);
290 err = __dcache_readdir(filp, dirent, filldir);
294 spin_unlock(&ci->i_ceph_lock);
297 err = note_last_dentry(fi, fi->dentry->d_name.name,
298 fi->dentry->d_name.len);
305 /* proceed with a normal readdir */
308 /* do we have the correct frag content buffered? */
309 if (fi->frag != frag || fi->last_readdir == NULL) {
310 struct ceph_mds_request *req;
311 int op = ceph_snap(inode) == CEPH_SNAPDIR ?
312 CEPH_MDS_OP_LSSNAP : CEPH_MDS_OP_READDIR;
314 /* discard old result, if any */
315 if (fi->last_readdir) {
316 ceph_mdsc_put_request(fi->last_readdir);
317 fi->last_readdir = NULL;
320 /* requery frag tree, as the frag topology may have changed */
321 frag = ceph_choose_frag(ceph_inode(inode), frag, NULL, NULL);
323 dout("readdir fetching %llx.%llx frag %x offset '%s'\n",
324 ceph_vinop(inode), frag, fi->last_name);
325 req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS);
328 req->r_inode = inode;
330 req->r_dentry = dget(filp->f_dentry);
331 /* hints to request -> mds selection code */
332 req->r_direct_mode = USE_AUTH_MDS;
333 req->r_direct_hash = ceph_frag_value(frag);
334 req->r_direct_is_hash = true;
335 req->r_path2 = kstrdup(fi->last_name, GFP_NOFS);
336 req->r_readdir_offset = fi->next_offset;
337 req->r_args.readdir.frag = cpu_to_le32(frag);
338 req->r_args.readdir.max_entries = cpu_to_le32(max_entries);
339 req->r_args.readdir.max_bytes = cpu_to_le32(max_bytes);
340 req->r_num_caps = max_entries + 1;
341 err = ceph_mdsc_do_request(mdsc, NULL, req);
343 ceph_mdsc_put_request(req);
346 dout("readdir got and parsed readdir result=%d"
347 " on frag %x, end=%d, complete=%d\n", err, frag,
348 (int)req->r_reply_info.dir_end,
349 (int)req->r_reply_info.dir_complete);
351 if (!req->r_did_prepopulate) {
352 dout("readdir !did_prepopulate");
353 fi->dir_release_count--; /* preclude D_COMPLETE */
356 /* note next offset and last dentry name */
357 fi->offset = fi->next_offset;
358 fi->last_readdir = req;
360 if (req->r_reply_info.dir_end) {
361 kfree(fi->last_name);
362 fi->last_name = NULL;
363 if (ceph_frag_is_rightmost(frag))
368 rinfo = &req->r_reply_info;
369 err = note_last_dentry(fi,
370 rinfo->dir_dname[rinfo->dir_nr-1],
371 rinfo->dir_dname_len[rinfo->dir_nr-1]);
374 fi->next_offset += rinfo->dir_nr;
378 rinfo = &fi->last_readdir->r_reply_info;
379 dout("readdir frag %x num %d off %d chunkoff %d\n", frag,
380 rinfo->dir_nr, off, fi->offset);
381 while (off >= fi->offset && off - fi->offset < rinfo->dir_nr) {
382 u64 pos = ceph_make_fpos(frag, off);
383 struct ceph_mds_reply_inode *in =
384 rinfo->dir_in[off - fi->offset].in;
385 struct ceph_vino vino;
388 dout("readdir off %d (%d/%d) -> %lld '%.*s' %p\n",
389 off, off - fi->offset, rinfo->dir_nr, pos,
390 rinfo->dir_dname_len[off - fi->offset],
391 rinfo->dir_dname[off - fi->offset], in);
393 ftype = le32_to_cpu(in->mode) >> 12;
394 vino.ino = le64_to_cpu(in->ino);
395 vino.snap = le64_to_cpu(in->snapid);
396 ino = ceph_vino_to_ino(vino);
398 rinfo->dir_dname[off - fi->offset],
399 rinfo->dir_dname_len[off - fi->offset],
401 ceph_translate_ino(inode->i_sb, ino), ftype) < 0) {
402 dout("filldir stopping us...\n");
406 filp->f_pos = pos + 1;
410 ceph_mdsc_put_request(fi->last_readdir);
411 fi->last_readdir = NULL;
416 if (!ceph_frag_is_rightmost(frag)) {
417 frag = ceph_frag_next(frag);
419 filp->f_pos = ceph_make_fpos(frag, off);
420 dout("readdir next frag is %x\n", frag);
423 fi->flags |= CEPH_F_ATEND;
426 * if dir_release_count still matches the dir, no dentries
427 * were released during the whole readdir, and we should have
428 * the complete dir contents in our cache.
430 spin_lock(&ci->i_ceph_lock);
431 if (ci->i_release_count == fi->dir_release_count) {
432 ceph_dir_set_complete(inode);
433 ci->i_max_offset = filp->f_pos;
435 spin_unlock(&ci->i_ceph_lock);
437 dout("readdir %p filp %p done.\n", inode, filp);
441 static void reset_readdir(struct ceph_file_info *fi)
443 if (fi->last_readdir) {
444 ceph_mdsc_put_request(fi->last_readdir);
445 fi->last_readdir = NULL;
447 kfree(fi->last_name);
448 fi->last_name = NULL;
449 fi->next_offset = 2; /* compensate for . and .. */
454 fi->flags &= ~CEPH_F_ATEND;
457 static loff_t ceph_dir_llseek(struct file *file, loff_t offset, int origin)
459 struct ceph_file_info *fi = file->private_data;
460 struct inode *inode = file->f_mapping->host;
461 loff_t old_offset = offset;
464 mutex_lock(&inode->i_mutex);
468 offset += inode->i_size + 2; /* FIXME */
471 offset += file->f_pos;
478 if (offset >= 0 && offset <= inode->i_sb->s_maxbytes) {
479 if (offset != file->f_pos) {
480 file->f_pos = offset;
482 fi->flags &= ~CEPH_F_ATEND;
487 * discard buffered readdir content on seekdir(0), or
488 * seek to new frag, or seek prior to current chunk.
491 fpos_frag(offset) != fpos_frag(old_offset) ||
492 fpos_off(offset) < fi->offset) {
493 dout("dir_llseek dropping %p content\n", file);
497 /* bump dir_release_count if we did a forward seek */
498 if (offset > old_offset)
499 fi->dir_release_count--;
502 mutex_unlock(&inode->i_mutex);
507 * Handle lookups for the hidden .snap directory.
509 int ceph_handle_snapdir(struct ceph_mds_request *req,
510 struct dentry *dentry, int err)
512 struct ceph_fs_client *fsc = ceph_sb_to_client(dentry->d_sb);
513 struct inode *parent = dentry->d_parent->d_inode; /* we hold i_mutex */
516 if (err == -ENOENT &&
517 ceph_snap(parent) == CEPH_NOSNAP &&
518 strcmp(dentry->d_name.name,
519 fsc->mount_options->snapdir_name) == 0) {
520 struct inode *inode = ceph_get_snapdir(parent);
521 dout("ENOENT on snapdir %p '%.*s', linking to snapdir %p\n",
522 dentry, dentry->d_name.len, dentry->d_name.name, inode);
523 BUG_ON(!d_unhashed(dentry));
524 d_add(dentry, inode);
531 * Figure out final result of a lookup/open request.
533 * Mainly, make sure we return the final req->r_dentry (if it already
534 * existed) in place of the original VFS-provided dentry when they
537 * Gracefully handle the case where the MDS replies with -ENOENT and
538 * no trace (which it may do, at its discretion, e.g., if it doesn't
539 * care to issue a lease on the negative dentry).
541 struct dentry *ceph_finish_lookup(struct ceph_mds_request *req,
542 struct dentry *dentry, int err)
544 if (err == -ENOENT) {
547 if (!req->r_reply_info.head->is_dentry) {
548 dout("ENOENT and no trace, dentry %p inode %p\n",
549 dentry, dentry->d_inode);
550 if (dentry->d_inode) {
559 dentry = ERR_PTR(err);
560 else if (dentry != req->r_dentry)
561 dentry = dget(req->r_dentry); /* we got spliced */
567 static int is_root_ceph_dentry(struct inode *inode, struct dentry *dentry)
569 return ceph_ino(inode) == CEPH_INO_ROOT &&
570 strncmp(dentry->d_name.name, ".ceph", 5) == 0;
574 * Look up a single dir entry. If there is a lookup intent, inform
575 * the MDS so that it gets our 'caps wanted' value in a single op.
577 static struct dentry *ceph_lookup(struct inode *dir, struct dentry *dentry,
580 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
581 struct ceph_mds_client *mdsc = fsc->mdsc;
582 struct ceph_mds_request *req;
586 dout("lookup %p dentry %p '%.*s'\n",
587 dir, dentry, dentry->d_name.len, dentry->d_name.name);
589 if (dentry->d_name.len > NAME_MAX)
590 return ERR_PTR(-ENAMETOOLONG);
592 err = ceph_init_dentry(dentry);
596 /* can we conclude ENOENT locally? */
597 if (dentry->d_inode == NULL) {
598 struct ceph_inode_info *ci = ceph_inode(dir);
599 struct ceph_dentry_info *di = ceph_dentry(dentry);
601 spin_lock(&ci->i_ceph_lock);
602 dout(" dir %p flags are %d\n", dir, ci->i_ceph_flags);
603 if (strncmp(dentry->d_name.name,
604 fsc->mount_options->snapdir_name,
605 dentry->d_name.len) &&
606 !is_root_ceph_dentry(dir, dentry) &&
607 ceph_dir_test_complete(dir) &&
608 (__ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1))) {
609 spin_unlock(&ci->i_ceph_lock);
610 dout(" dir %p complete, -ENOENT\n", dir);
612 di->lease_shared_gen = ci->i_shared_gen;
615 spin_unlock(&ci->i_ceph_lock);
618 op = ceph_snap(dir) == CEPH_SNAPDIR ?
619 CEPH_MDS_OP_LOOKUPSNAP : CEPH_MDS_OP_LOOKUP;
620 req = ceph_mdsc_create_request(mdsc, op, USE_ANY_MDS);
622 return ERR_CAST(req);
623 req->r_dentry = dget(dentry);
625 /* we only need inode linkage */
626 req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INODE);
627 req->r_locked_dir = dir;
628 err = ceph_mdsc_do_request(mdsc, NULL, req);
629 err = ceph_handle_snapdir(req, dentry, err);
630 dentry = ceph_finish_lookup(req, dentry, err);
631 ceph_mdsc_put_request(req); /* will dput(dentry) */
632 dout("lookup result=%p\n", dentry);
636 int ceph_atomic_open(struct inode *dir, struct dentry *dentry,
637 struct file *file, unsigned flags, umode_t mode,
641 struct dentry *res = NULL;
643 if (!(flags & O_CREAT)) {
644 if (dentry->d_name.len > NAME_MAX)
645 return -ENAMETOOLONG;
647 err = ceph_init_dentry(dentry);
651 return ceph_lookup_open(dir, dentry, file, flags, mode, opened);
654 if (d_unhashed(dentry)) {
655 res = ceph_lookup(dir, dentry, 0);
663 /* We don't deal with positive dentries here */
665 return finish_no_open(file, res);
667 *opened |= FILE_CREATED;
668 err = ceph_lookup_open(dir, dentry, file, flags, mode, opened);
675 * If we do a create but get no trace back from the MDS, follow up with
676 * a lookup (the VFS expects us to link up the provided dentry).
678 int ceph_handle_notrace_create(struct inode *dir, struct dentry *dentry)
680 struct dentry *result = ceph_lookup(dir, dentry, 0);
682 if (result && !IS_ERR(result)) {
684 * We created the item, then did a lookup, and found
685 * it was already linked to another inode we already
686 * had in our cache (and thus got spliced). Link our
687 * dentry to that inode, but don't hash it, just in
688 * case the VFS wants to dereference it.
690 BUG_ON(!result->d_inode);
691 d_instantiate(dentry, result->d_inode);
694 return PTR_ERR(result);
697 static int ceph_mknod(struct inode *dir, struct dentry *dentry,
698 umode_t mode, dev_t rdev)
700 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
701 struct ceph_mds_client *mdsc = fsc->mdsc;
702 struct ceph_mds_request *req;
705 if (ceph_snap(dir) != CEPH_NOSNAP)
708 dout("mknod in dir %p dentry %p mode 0%ho rdev %d\n",
709 dir, dentry, mode, rdev);
710 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_MKNOD, USE_AUTH_MDS);
715 req->r_dentry = dget(dentry);
717 req->r_locked_dir = dir;
718 req->r_args.mknod.mode = cpu_to_le32(mode);
719 req->r_args.mknod.rdev = cpu_to_le32(rdev);
720 req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
721 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
722 err = ceph_mdsc_do_request(mdsc, dir, req);
723 if (!err && !req->r_reply_info.head->is_dentry)
724 err = ceph_handle_notrace_create(dir, dentry);
725 ceph_mdsc_put_request(req);
731 static int ceph_create(struct inode *dir, struct dentry *dentry, umode_t mode,
734 return ceph_mknod(dir, dentry, mode, 0);
737 static int ceph_symlink(struct inode *dir, struct dentry *dentry,
740 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
741 struct ceph_mds_client *mdsc = fsc->mdsc;
742 struct ceph_mds_request *req;
745 if (ceph_snap(dir) != CEPH_NOSNAP)
748 dout("symlink in dir %p dentry %p to '%s'\n", dir, dentry, dest);
749 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SYMLINK, USE_AUTH_MDS);
754 req->r_dentry = dget(dentry);
756 req->r_path2 = kstrdup(dest, GFP_NOFS);
757 req->r_locked_dir = dir;
758 req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
759 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
760 err = ceph_mdsc_do_request(mdsc, dir, req);
761 if (!err && !req->r_reply_info.head->is_dentry)
762 err = ceph_handle_notrace_create(dir, dentry);
763 ceph_mdsc_put_request(req);
769 static int ceph_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
771 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
772 struct ceph_mds_client *mdsc = fsc->mdsc;
773 struct ceph_mds_request *req;
777 if (ceph_snap(dir) == CEPH_SNAPDIR) {
778 /* mkdir .snap/foo is a MKSNAP */
779 op = CEPH_MDS_OP_MKSNAP;
780 dout("mksnap dir %p snap '%.*s' dn %p\n", dir,
781 dentry->d_name.len, dentry->d_name.name, dentry);
782 } else if (ceph_snap(dir) == CEPH_NOSNAP) {
783 dout("mkdir dir %p dn %p mode 0%ho\n", dir, dentry, mode);
784 op = CEPH_MDS_OP_MKDIR;
788 req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS);
794 req->r_dentry = dget(dentry);
796 req->r_locked_dir = dir;
797 req->r_args.mkdir.mode = cpu_to_le32(mode);
798 req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
799 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
800 err = ceph_mdsc_do_request(mdsc, dir, req);
801 if (!err && !req->r_reply_info.head->is_dentry)
802 err = ceph_handle_notrace_create(dir, dentry);
803 ceph_mdsc_put_request(req);
810 static int ceph_link(struct dentry *old_dentry, struct inode *dir,
811 struct dentry *dentry)
813 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
814 struct ceph_mds_client *mdsc = fsc->mdsc;
815 struct ceph_mds_request *req;
818 if (ceph_snap(dir) != CEPH_NOSNAP)
821 dout("link in dir %p old_dentry %p dentry %p\n", dir,
823 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_LINK, USE_AUTH_MDS);
828 req->r_dentry = dget(dentry);
830 req->r_old_dentry = dget(old_dentry); /* or inode? hrm. */
831 req->r_old_dentry_dir = ceph_get_dentry_parent_inode(old_dentry);
832 req->r_locked_dir = dir;
833 req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
834 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
835 err = ceph_mdsc_do_request(mdsc, dir, req);
838 } else if (!req->r_reply_info.head->is_dentry) {
839 ihold(old_dentry->d_inode);
840 d_instantiate(dentry, old_dentry->d_inode);
842 ceph_mdsc_put_request(req);
847 * For a soon-to-be unlinked file, drop the AUTH_RDCACHE caps. If it
848 * looks like the link count will hit 0, drop any other caps (other
849 * than PIN) we don't specifically want (due to the file still being
852 static int drop_caps_for_unlink(struct inode *inode)
854 struct ceph_inode_info *ci = ceph_inode(inode);
855 int drop = CEPH_CAP_LINK_SHARED | CEPH_CAP_LINK_EXCL;
857 spin_lock(&ci->i_ceph_lock);
858 if (inode->i_nlink == 1) {
859 drop |= ~(__ceph_caps_wanted(ci) | CEPH_CAP_PIN);
860 ci->i_ceph_flags |= CEPH_I_NODELAY;
862 spin_unlock(&ci->i_ceph_lock);
867 * rmdir and unlink are differ only by the metadata op code
869 static int ceph_unlink(struct inode *dir, struct dentry *dentry)
871 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
872 struct ceph_mds_client *mdsc = fsc->mdsc;
873 struct inode *inode = dentry->d_inode;
874 struct ceph_mds_request *req;
878 if (ceph_snap(dir) == CEPH_SNAPDIR) {
879 /* rmdir .snap/foo is RMSNAP */
880 dout("rmsnap dir %p '%.*s' dn %p\n", dir, dentry->d_name.len,
881 dentry->d_name.name, dentry);
882 op = CEPH_MDS_OP_RMSNAP;
883 } else if (ceph_snap(dir) == CEPH_NOSNAP) {
884 dout("unlink/rmdir dir %p dn %p inode %p\n",
886 op = S_ISDIR(dentry->d_inode->i_mode) ?
887 CEPH_MDS_OP_RMDIR : CEPH_MDS_OP_UNLINK;
890 req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS);
895 req->r_dentry = dget(dentry);
897 req->r_locked_dir = dir;
898 req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
899 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
900 req->r_inode_drop = drop_caps_for_unlink(inode);
901 err = ceph_mdsc_do_request(mdsc, dir, req);
902 if (!err && !req->r_reply_info.head->is_dentry)
904 ceph_mdsc_put_request(req);
909 static int ceph_rename(struct inode *old_dir, struct dentry *old_dentry,
910 struct inode *new_dir, struct dentry *new_dentry)
912 struct ceph_fs_client *fsc = ceph_sb_to_client(old_dir->i_sb);
913 struct ceph_mds_client *mdsc = fsc->mdsc;
914 struct ceph_mds_request *req;
917 if (ceph_snap(old_dir) != ceph_snap(new_dir))
919 if (ceph_snap(old_dir) != CEPH_NOSNAP ||
920 ceph_snap(new_dir) != CEPH_NOSNAP)
922 dout("rename dir %p dentry %p to dir %p dentry %p\n",
923 old_dir, old_dentry, new_dir, new_dentry);
924 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_RENAME, USE_AUTH_MDS);
927 req->r_dentry = dget(new_dentry);
929 req->r_old_dentry = dget(old_dentry);
930 req->r_old_dentry_dir = ceph_get_dentry_parent_inode(old_dentry);
931 req->r_locked_dir = new_dir;
932 req->r_old_dentry_drop = CEPH_CAP_FILE_SHARED;
933 req->r_old_dentry_unless = CEPH_CAP_FILE_EXCL;
934 req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
935 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
936 /* release LINK_RDCACHE on source inode (mds will lock it) */
937 req->r_old_inode_drop = CEPH_CAP_LINK_SHARED;
938 if (new_dentry->d_inode)
939 req->r_inode_drop = drop_caps_for_unlink(new_dentry->d_inode);
940 err = ceph_mdsc_do_request(mdsc, old_dir, req);
941 if (!err && !req->r_reply_info.head->is_dentry) {
943 * Normally d_move() is done by fill_trace (called by
944 * do_request, above). If there is no trace, we need
948 /* d_move screws up d_subdirs order */
949 ceph_dir_clear_complete(new_dir);
951 d_move(old_dentry, new_dentry);
953 /* ensure target dentry is invalidated, despite
954 rehashing bug in vfs_rename_dir */
955 ceph_invalidate_dentry_lease(new_dentry);
957 ceph_mdsc_put_request(req);
962 * Ensure a dentry lease will no longer revalidate.
964 void ceph_invalidate_dentry_lease(struct dentry *dentry)
966 spin_lock(&dentry->d_lock);
967 dentry->d_time = jiffies;
968 ceph_dentry(dentry)->lease_shared_gen = 0;
969 spin_unlock(&dentry->d_lock);
973 * Check if dentry lease is valid. If not, delete the lease. Try to
974 * renew if the least is more than half up.
976 static int dentry_lease_is_valid(struct dentry *dentry)
978 struct ceph_dentry_info *di;
979 struct ceph_mds_session *s;
983 struct ceph_mds_session *session = NULL;
984 struct inode *dir = NULL;
987 spin_lock(&dentry->d_lock);
988 di = ceph_dentry(dentry);
989 if (di->lease_session) {
990 s = di->lease_session;
991 spin_lock(&s->s_gen_ttl_lock);
994 spin_unlock(&s->s_gen_ttl_lock);
996 if (di->lease_gen == gen &&
997 time_before(jiffies, dentry->d_time) &&
998 time_before(jiffies, ttl)) {
1000 if (di->lease_renew_after &&
1001 time_after(jiffies, di->lease_renew_after)) {
1002 /* we should renew */
1003 dir = dentry->d_parent->d_inode;
1004 session = ceph_get_mds_session(s);
1005 seq = di->lease_seq;
1006 di->lease_renew_after = 0;
1007 di->lease_renew_from = jiffies;
1011 spin_unlock(&dentry->d_lock);
1014 ceph_mdsc_lease_send_msg(session, dir, dentry,
1015 CEPH_MDS_LEASE_RENEW, seq);
1016 ceph_put_mds_session(session);
1018 dout("dentry_lease_is_valid - dentry %p = %d\n", dentry, valid);
1023 * Check if directory-wide content lease/cap is valid.
1025 static int dir_lease_is_valid(struct inode *dir, struct dentry *dentry)
1027 struct ceph_inode_info *ci = ceph_inode(dir);
1028 struct ceph_dentry_info *di = ceph_dentry(dentry);
1031 spin_lock(&ci->i_ceph_lock);
1032 if (ci->i_shared_gen == di->lease_shared_gen)
1033 valid = __ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1);
1034 spin_unlock(&ci->i_ceph_lock);
1035 dout("dir_lease_is_valid dir %p v%u dentry %p v%u = %d\n",
1036 dir, (unsigned)ci->i_shared_gen, dentry,
1037 (unsigned)di->lease_shared_gen, valid);
1042 * Check if cached dentry can be trusted.
1044 static int ceph_d_revalidate(struct dentry *dentry, unsigned int flags)
1049 if (flags & LOOKUP_RCU)
1052 dout("d_revalidate %p '%.*s' inode %p offset %lld\n", dentry,
1053 dentry->d_name.len, dentry->d_name.name, dentry->d_inode,
1054 ceph_dentry(dentry)->offset);
1056 dir = ceph_get_dentry_parent_inode(dentry);
1058 /* always trust cached snapped dentries, snapdir dentry */
1059 if (ceph_snap(dir) != CEPH_NOSNAP) {
1060 dout("d_revalidate %p '%.*s' inode %p is SNAPPED\n", dentry,
1061 dentry->d_name.len, dentry->d_name.name, dentry->d_inode);
1063 } else if (dentry->d_inode &&
1064 ceph_snap(dentry->d_inode) == CEPH_SNAPDIR) {
1066 } else if (dentry_lease_is_valid(dentry) ||
1067 dir_lease_is_valid(dir, dentry)) {
1071 dout("d_revalidate %p %s\n", dentry, valid ? "valid" : "invalid");
1073 ceph_dentry_lru_touch(dentry);
1081 * Release our ceph_dentry_info.
1083 static void ceph_d_release(struct dentry *dentry)
1085 struct ceph_dentry_info *di = ceph_dentry(dentry);
1087 dout("d_release %p\n", dentry);
1088 ceph_dentry_lru_del(dentry);
1089 if (di->lease_session)
1090 ceph_put_mds_session(di->lease_session);
1091 kmem_cache_free(ceph_dentry_cachep, di);
1092 dentry->d_fsdata = NULL;
1095 static int ceph_snapdir_d_revalidate(struct dentry *dentry,
1099 * Eventually, we'll want to revalidate snapped metadata
1100 * too... probably...
1106 * Set/clear/test dir complete flag on the dir's dentry.
1108 void ceph_dir_set_complete(struct inode *inode)
1110 struct dentry *dentry = d_find_any_alias(inode);
1112 if (dentry && ceph_dentry(dentry) &&
1113 ceph_test_mount_opt(ceph_sb_to_client(dentry->d_sb), DCACHE)) {
1114 dout(" marking %p (%p) complete\n", inode, dentry);
1115 set_bit(CEPH_D_COMPLETE, &ceph_dentry(dentry)->flags);
1120 void ceph_dir_clear_complete(struct inode *inode)
1122 struct dentry *dentry = d_find_any_alias(inode);
1124 if (dentry && ceph_dentry(dentry)) {
1125 dout(" marking %p (%p) complete\n", inode, dentry);
1126 set_bit(CEPH_D_COMPLETE, &ceph_dentry(dentry)->flags);
1131 bool ceph_dir_test_complete(struct inode *inode)
1133 struct dentry *dentry = d_find_any_alias(inode);
1135 if (dentry && ceph_dentry(dentry)) {
1136 dout(" marking %p (%p) NOT complete\n", inode, dentry);
1137 clear_bit(CEPH_D_COMPLETE, &ceph_dentry(dentry)->flags);
1144 * When the VFS prunes a dentry from the cache, we need to clear the
1145 * complete flag on the parent directory.
1147 * Called under dentry->d_lock.
1149 static void ceph_d_prune(struct dentry *dentry)
1151 struct ceph_dentry_info *di;
1153 dout("ceph_d_prune %p\n", dentry);
1155 /* do we have a valid parent? */
1156 if (IS_ROOT(dentry))
1159 /* if we are not hashed, we don't affect D_COMPLETE */
1160 if (d_unhashed(dentry))
1164 * we hold d_lock, so d_parent is stable, and d_fsdata is never
1165 * cleared until d_release
1167 di = ceph_dentry(dentry->d_parent);
1168 clear_bit(CEPH_D_COMPLETE, &di->flags);
1172 * read() on a dir. This weird interface hack only works if mounted
1173 * with '-o dirstat'.
1175 static ssize_t ceph_read_dir(struct file *file, char __user *buf, size_t size,
1178 struct ceph_file_info *cf = file->private_data;
1179 struct inode *inode = file->f_dentry->d_inode;
1180 struct ceph_inode_info *ci = ceph_inode(inode);
1182 const int bufsize = 1024;
1184 if (!ceph_test_mount_opt(ceph_sb_to_client(inode->i_sb), DIRSTAT))
1187 if (!cf->dir_info) {
1188 cf->dir_info = kmalloc(bufsize, GFP_NOFS);
1192 snprintf(cf->dir_info, bufsize,
1195 " subdirs: %20lld\n"
1196 "rentries: %20lld\n"
1198 " rsubdirs: %20lld\n"
1200 "rctime: %10ld.%09ld\n",
1201 ci->i_files + ci->i_subdirs,
1204 ci->i_rfiles + ci->i_rsubdirs,
1208 (long)ci->i_rctime.tv_sec,
1209 (long)ci->i_rctime.tv_nsec);
1212 if (*ppos >= cf->dir_info_len)
1214 size = min_t(unsigned, size, cf->dir_info_len-*ppos);
1215 left = copy_to_user(buf, cf->dir_info + *ppos, size);
1218 *ppos += (size - left);
1223 * an fsync() on a dir will wait for any uncommitted directory
1224 * operations to commit.
1226 static int ceph_dir_fsync(struct file *file, loff_t start, loff_t end,
1229 struct inode *inode = file->f_path.dentry->d_inode;
1230 struct ceph_inode_info *ci = ceph_inode(inode);
1231 struct list_head *head = &ci->i_unsafe_dirops;
1232 struct ceph_mds_request *req;
1236 dout("dir_fsync %p\n", inode);
1237 ret = filemap_write_and_wait_range(inode->i_mapping, start, end);
1240 mutex_lock(&inode->i_mutex);
1242 spin_lock(&ci->i_unsafe_lock);
1243 if (list_empty(head))
1246 req = list_entry(head->prev,
1247 struct ceph_mds_request, r_unsafe_dir_item);
1248 last_tid = req->r_tid;
1251 ceph_mdsc_get_request(req);
1252 spin_unlock(&ci->i_unsafe_lock);
1254 dout("dir_fsync %p wait on tid %llu (until %llu)\n",
1255 inode, req->r_tid, last_tid);
1256 if (req->r_timeout) {
1257 ret = wait_for_completion_timeout(
1258 &req->r_safe_completion, req->r_timeout);
1262 ret = -EIO; /* timed out */
1264 wait_for_completion(&req->r_safe_completion);
1266 ceph_mdsc_put_request(req);
1268 spin_lock(&ci->i_unsafe_lock);
1269 if (ret || list_empty(head))
1271 req = list_entry(head->next,
1272 struct ceph_mds_request, r_unsafe_dir_item);
1273 } while (req->r_tid < last_tid);
1275 spin_unlock(&ci->i_unsafe_lock);
1276 mutex_unlock(&inode->i_mutex);
1282 * We maintain a private dentry LRU.
1284 * FIXME: this needs to be changed to a per-mds lru to be useful.
1286 void ceph_dentry_lru_add(struct dentry *dn)
1288 struct ceph_dentry_info *di = ceph_dentry(dn);
1289 struct ceph_mds_client *mdsc;
1291 dout("dentry_lru_add %p %p '%.*s'\n", di, dn,
1292 dn->d_name.len, dn->d_name.name);
1293 mdsc = ceph_sb_to_client(dn->d_sb)->mdsc;
1294 spin_lock(&mdsc->dentry_lru_lock);
1295 list_add_tail(&di->lru, &mdsc->dentry_lru);
1297 spin_unlock(&mdsc->dentry_lru_lock);
1300 void ceph_dentry_lru_touch(struct dentry *dn)
1302 struct ceph_dentry_info *di = ceph_dentry(dn);
1303 struct ceph_mds_client *mdsc;
1305 dout("dentry_lru_touch %p %p '%.*s' (offset %lld)\n", di, dn,
1306 dn->d_name.len, dn->d_name.name, di->offset);
1307 mdsc = ceph_sb_to_client(dn->d_sb)->mdsc;
1308 spin_lock(&mdsc->dentry_lru_lock);
1309 list_move_tail(&di->lru, &mdsc->dentry_lru);
1310 spin_unlock(&mdsc->dentry_lru_lock);
1313 void ceph_dentry_lru_del(struct dentry *dn)
1315 struct ceph_dentry_info *di = ceph_dentry(dn);
1316 struct ceph_mds_client *mdsc;
1318 dout("dentry_lru_del %p %p '%.*s'\n", di, dn,
1319 dn->d_name.len, dn->d_name.name);
1320 mdsc = ceph_sb_to_client(dn->d_sb)->mdsc;
1321 spin_lock(&mdsc->dentry_lru_lock);
1322 list_del_init(&di->lru);
1324 spin_unlock(&mdsc->dentry_lru_lock);
1328 * Return name hash for a given dentry. This is dependent on
1329 * the parent directory's hash function.
1331 unsigned ceph_dentry_hash(struct inode *dir, struct dentry *dn)
1333 struct ceph_inode_info *dci = ceph_inode(dir);
1335 switch (dci->i_dir_layout.dl_dir_hash) {
1336 case 0: /* for backward compat */
1337 case CEPH_STR_HASH_LINUX:
1338 return dn->d_name.hash;
1341 return ceph_str_hash(dci->i_dir_layout.dl_dir_hash,
1342 dn->d_name.name, dn->d_name.len);
1346 const struct file_operations ceph_dir_fops = {
1347 .read = ceph_read_dir,
1348 .readdir = ceph_readdir,
1349 .llseek = ceph_dir_llseek,
1351 .release = ceph_release,
1352 .unlocked_ioctl = ceph_ioctl,
1353 .fsync = ceph_dir_fsync,
1356 const struct inode_operations ceph_dir_iops = {
1357 .lookup = ceph_lookup,
1358 .permission = ceph_permission,
1359 .getattr = ceph_getattr,
1360 .setattr = ceph_setattr,
1361 .setxattr = ceph_setxattr,
1362 .getxattr = ceph_getxattr,
1363 .listxattr = ceph_listxattr,
1364 .removexattr = ceph_removexattr,
1365 .mknod = ceph_mknod,
1366 .symlink = ceph_symlink,
1367 .mkdir = ceph_mkdir,
1369 .unlink = ceph_unlink,
1370 .rmdir = ceph_unlink,
1371 .rename = ceph_rename,
1372 .create = ceph_create,
1373 .atomic_open = ceph_atomic_open,
1376 const struct dentry_operations ceph_dentry_ops = {
1377 .d_revalidate = ceph_d_revalidate,
1378 .d_release = ceph_d_release,
1379 .d_prune = ceph_d_prune,
1382 const struct dentry_operations ceph_snapdir_dentry_ops = {
1383 .d_revalidate = ceph_snapdir_d_revalidate,
1384 .d_release = ceph_d_release,
1387 const struct dentry_operations ceph_snap_dentry_ops = {
1388 .d_release = ceph_d_release,
1389 .d_prune = ceph_d_prune,