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;
103 static int fpos_cmp(loff_t l, loff_t r)
105 int v = ceph_frag_compare(fpos_frag(l), fpos_frag(r));
108 return (int)(fpos_off(l) - fpos_off(r));
112 * When possible, we try to satisfy a readdir by peeking at the
113 * dcache. We make this work by carefully ordering dentries on
114 * d_child when we initially get results back from the MDS, and
115 * falling back to a "normal" sync readdir if any dentries in the dir
118 * Complete dir indicates that we have all dentries in the dir. It is
119 * defined IFF we hold CEPH_CAP_FILE_SHARED (which will be revoked by
120 * the MDS if/when the directory is modified).
122 static int __dcache_readdir(struct file *file, struct dir_context *ctx,
125 struct ceph_file_info *fi = file->private_data;
126 struct dentry *parent = file->f_dentry;
127 struct inode *dir = parent->d_inode;
129 struct dentry *dentry, *last;
130 struct ceph_dentry_info *di;
133 /* claim ref on last dentry we returned */
137 dout("__dcache_readdir %p v%u at %llu (last %p)\n",
138 dir, shared_gen, ctx->pos, last);
140 spin_lock(&parent->d_lock);
142 /* start at beginning? */
143 if (ctx->pos == 2 || last == NULL ||
144 fpos_cmp(ctx->pos, ceph_dentry(last)->offset) < 0) {
145 if (list_empty(&parent->d_subdirs))
147 p = parent->d_subdirs.prev;
148 dout(" initial p %p/%p\n", p->prev, p->next);
150 p = last->d_child.prev;
154 dentry = list_entry(p, struct dentry, d_child);
155 di = ceph_dentry(dentry);
157 dout(" p %p/%p %s d_subdirs %p/%p\n", p->prev, p->next,
158 d_unhashed(dentry) ? "!hashed" : "hashed",
159 parent->d_subdirs.prev, parent->d_subdirs.next);
160 if (p == &parent->d_subdirs) {
161 fi->flags |= CEPH_F_ATEND;
164 spin_lock_nested(&dentry->d_lock, DENTRY_D_LOCK_NESTED);
165 if (di->lease_shared_gen == shared_gen &&
166 !d_unhashed(dentry) && dentry->d_inode &&
167 ceph_snap(dentry->d_inode) != CEPH_SNAPDIR &&
168 ceph_ino(dentry->d_inode) != CEPH_INO_CEPH &&
169 fpos_cmp(ctx->pos, di->offset) <= 0)
171 dout(" skipping %p %pd at %llu (%llu)%s%s\n", dentry,
173 ctx->pos, d_unhashed(dentry) ? " unhashed" : "",
174 !dentry->d_inode ? " null" : "");
175 spin_unlock(&dentry->d_lock);
177 dentry = list_entry(p, struct dentry, d_child);
178 di = ceph_dentry(dentry);
182 spin_unlock(&dentry->d_lock);
183 spin_unlock(&parent->d_lock);
185 /* make sure a dentry wasn't dropped while we didn't have parent lock */
186 if (!ceph_dir_is_complete(dir)) {
187 dout(" lost dir complete on %p; falling back to mds\n", dir);
193 dout(" %llu (%llu) dentry %p %pd %p\n", di->offset, ctx->pos,
194 dentry, dentry, dentry->d_inode);
195 if (!dir_emit(ctx, dentry->d_name.name,
197 ceph_translate_ino(dentry->d_sb, dentry->d_inode->i_ino),
198 dentry->d_inode->i_mode >> 12)) {
200 /* remember our position */
202 fi->next_offset = fpos_off(di->offset);
208 ctx->pos = di->offset + 1;
214 spin_lock(&parent->d_lock);
215 p = p->prev; /* advance to next dentry */
219 spin_unlock(&parent->d_lock);
227 * make note of the last dentry we read, so we can
228 * continue at the same lexicographical point,
229 * regardless of what dir changes take place on the
232 static int note_last_dentry(struct ceph_file_info *fi, const char *name,
235 kfree(fi->last_name);
236 fi->last_name = kmalloc(len+1, GFP_NOFS);
239 memcpy(fi->last_name, name, len);
240 fi->last_name[len] = 0;
241 dout("note_last_dentry '%s'\n", fi->last_name);
245 static int ceph_readdir(struct file *file, struct dir_context *ctx)
247 struct ceph_file_info *fi = file->private_data;
248 struct inode *inode = file_inode(file);
249 struct ceph_inode_info *ci = ceph_inode(inode);
250 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
251 struct ceph_mds_client *mdsc = fsc->mdsc;
252 unsigned frag = fpos_frag(ctx->pos);
253 int off = fpos_off(ctx->pos);
256 struct ceph_mds_reply_info_parsed *rinfo;
258 dout("readdir %p file %p frag %u off %u\n", inode, file, frag, off);
259 if (fi->flags & CEPH_F_ATEND)
262 /* always start with . and .. */
264 /* note dir version at start of readdir so we can tell
265 * if any dentries get dropped */
266 fi->dir_release_count = atomic_read(&ci->i_release_count);
268 dout("readdir off 0 -> '.'\n");
269 if (!dir_emit(ctx, ".", 1,
270 ceph_translate_ino(inode->i_sb, inode->i_ino),
271 inode->i_mode >> 12))
277 ino_t ino = parent_ino(file->f_dentry);
278 dout("readdir off 1 -> '..'\n");
279 if (!dir_emit(ctx, "..", 2,
280 ceph_translate_ino(inode->i_sb, ino),
281 inode->i_mode >> 12))
287 /* can we use the dcache? */
288 spin_lock(&ci->i_ceph_lock);
289 if ((ctx->pos == 2 || fi->dentry) &&
290 !ceph_test_mount_opt(fsc, NOASYNCREADDIR) &&
291 ceph_snap(inode) != CEPH_SNAPDIR &&
292 __ceph_dir_is_complete(ci) &&
293 __ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1)) {
294 u32 shared_gen = ci->i_shared_gen;
295 spin_unlock(&ci->i_ceph_lock);
296 err = __dcache_readdir(file, ctx, shared_gen);
299 frag = fpos_frag(ctx->pos);
300 off = fpos_off(ctx->pos);
302 spin_unlock(&ci->i_ceph_lock);
305 err = note_last_dentry(fi, fi->dentry->d_name.name,
306 fi->dentry->d_name.len);
313 /* proceed with a normal readdir */
316 /* do we have the correct frag content buffered? */
317 if (fi->frag != frag || fi->last_readdir == NULL) {
318 struct ceph_mds_request *req;
319 int op = ceph_snap(inode) == CEPH_SNAPDIR ?
320 CEPH_MDS_OP_LSSNAP : CEPH_MDS_OP_READDIR;
322 /* discard old result, if any */
323 if (fi->last_readdir) {
324 ceph_mdsc_put_request(fi->last_readdir);
325 fi->last_readdir = NULL;
328 dout("readdir fetching %llx.%llx frag %x offset '%s'\n",
329 ceph_vinop(inode), frag, fi->last_name);
330 req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS);
333 err = ceph_alloc_readdir_reply_buffer(req, inode);
335 ceph_mdsc_put_request(req);
338 req->r_inode = inode;
340 req->r_dentry = dget(file->f_dentry);
341 /* hints to request -> mds selection code */
342 req->r_direct_mode = USE_AUTH_MDS;
343 req->r_direct_hash = ceph_frag_value(frag);
344 req->r_direct_is_hash = true;
345 req->r_path2 = kstrdup(fi->last_name, GFP_NOFS);
346 req->r_readdir_offset = fi->next_offset;
347 req->r_args.readdir.frag = cpu_to_le32(frag);
348 err = ceph_mdsc_do_request(mdsc, NULL, req);
350 ceph_mdsc_put_request(req);
353 dout("readdir got and parsed readdir result=%d"
354 " on frag %x, end=%d, complete=%d\n", err, frag,
355 (int)req->r_reply_info.dir_end,
356 (int)req->r_reply_info.dir_complete);
358 if (!req->r_did_prepopulate) {
359 dout("readdir !did_prepopulate");
360 /* preclude from marking dir complete */
361 fi->dir_release_count--;
364 /* note next offset and last dentry name */
365 rinfo = &req->r_reply_info;
366 if (le32_to_cpu(rinfo->dir_dir->frag) != frag) {
367 frag = le32_to_cpu(rinfo->dir_dir->frag);
368 if (ceph_frag_is_leftmost(frag))
372 off = fi->next_offset;
375 fi->offset = fi->next_offset;
376 fi->last_readdir = req;
378 if (req->r_reply_info.dir_end) {
379 kfree(fi->last_name);
380 fi->last_name = NULL;
381 if (ceph_frag_is_rightmost(frag))
386 err = note_last_dentry(fi,
387 rinfo->dir_dname[rinfo->dir_nr-1],
388 rinfo->dir_dname_len[rinfo->dir_nr-1]);
391 fi->next_offset += rinfo->dir_nr;
395 rinfo = &fi->last_readdir->r_reply_info;
396 dout("readdir frag %x num %d off %d chunkoff %d\n", frag,
397 rinfo->dir_nr, off, fi->offset);
399 ctx->pos = ceph_make_fpos(frag, off);
400 while (off >= fi->offset && off - fi->offset < rinfo->dir_nr) {
401 struct ceph_mds_reply_inode *in =
402 rinfo->dir_in[off - fi->offset].in;
403 struct ceph_vino vino;
406 dout("readdir off %d (%d/%d) -> %lld '%.*s' %p\n",
407 off, off - fi->offset, rinfo->dir_nr, ctx->pos,
408 rinfo->dir_dname_len[off - fi->offset],
409 rinfo->dir_dname[off - fi->offset], in);
411 ftype = le32_to_cpu(in->mode) >> 12;
412 vino.ino = le64_to_cpu(in->ino);
413 vino.snap = le64_to_cpu(in->snapid);
414 ino = ceph_vino_to_ino(vino);
416 rinfo->dir_dname[off - fi->offset],
417 rinfo->dir_dname_len[off - fi->offset],
418 ceph_translate_ino(inode->i_sb, ino), ftype)) {
419 dout("filldir stopping us...\n");
427 ceph_mdsc_put_request(fi->last_readdir);
428 fi->last_readdir = NULL;
433 if (!ceph_frag_is_rightmost(frag)) {
434 frag = ceph_frag_next(frag);
436 ctx->pos = ceph_make_fpos(frag, off);
437 dout("readdir next frag is %x\n", frag);
440 fi->flags |= CEPH_F_ATEND;
443 * if dir_release_count still matches the dir, no dentries
444 * were released during the whole readdir, and we should have
445 * the complete dir contents in our cache.
447 spin_lock(&ci->i_ceph_lock);
448 if (atomic_read(&ci->i_release_count) == fi->dir_release_count) {
449 dout(" marking %p complete\n", inode);
450 __ceph_dir_set_complete(ci, fi->dir_release_count);
452 spin_unlock(&ci->i_ceph_lock);
454 dout("readdir %p file %p done.\n", inode, file);
458 static void reset_readdir(struct ceph_file_info *fi, unsigned frag)
460 if (fi->last_readdir) {
461 ceph_mdsc_put_request(fi->last_readdir);
462 fi->last_readdir = NULL;
464 kfree(fi->last_name);
465 fi->last_name = NULL;
466 if (ceph_frag_is_leftmost(frag))
467 fi->next_offset = 2; /* compensate for . and .. */
474 fi->flags &= ~CEPH_F_ATEND;
477 static loff_t ceph_dir_llseek(struct file *file, loff_t offset, int whence)
479 struct ceph_file_info *fi = file->private_data;
480 struct inode *inode = file->f_mapping->host;
481 loff_t old_offset = ceph_make_fpos(fi->frag, fi->next_offset);
484 mutex_lock(&inode->i_mutex);
488 offset += inode->i_size + 2; /* FIXME */
491 offset += file->f_pos;
499 if (offset != file->f_pos) {
500 file->f_pos = offset;
502 fi->flags &= ~CEPH_F_ATEND;
507 * discard buffered readdir content on seekdir(0), or
508 * seek to new frag, or seek prior to current chunk.
511 fpos_frag(offset) != fi->frag ||
512 fpos_off(offset) < fi->offset) {
513 dout("dir_llseek dropping %p content\n", file);
514 reset_readdir(fi, fpos_frag(offset));
517 /* bump dir_release_count if we did a forward seek */
518 if (fpos_cmp(offset, old_offset) > 0)
519 fi->dir_release_count--;
522 mutex_unlock(&inode->i_mutex);
527 * Handle lookups for the hidden .snap directory.
529 int ceph_handle_snapdir(struct ceph_mds_request *req,
530 struct dentry *dentry, int err)
532 struct ceph_fs_client *fsc = ceph_sb_to_client(dentry->d_sb);
533 struct inode *parent = dentry->d_parent->d_inode; /* we hold i_mutex */
536 if (err == -ENOENT &&
537 ceph_snap(parent) == CEPH_NOSNAP &&
538 strcmp(dentry->d_name.name,
539 fsc->mount_options->snapdir_name) == 0) {
540 struct inode *inode = ceph_get_snapdir(parent);
541 dout("ENOENT on snapdir %p '%pd', linking to snapdir %p\n",
542 dentry, dentry, inode);
543 BUG_ON(!d_unhashed(dentry));
544 d_add(dentry, inode);
551 * Figure out final result of a lookup/open request.
553 * Mainly, make sure we return the final req->r_dentry (if it already
554 * existed) in place of the original VFS-provided dentry when they
557 * Gracefully handle the case where the MDS replies with -ENOENT and
558 * no trace (which it may do, at its discretion, e.g., if it doesn't
559 * care to issue a lease on the negative dentry).
561 struct dentry *ceph_finish_lookup(struct ceph_mds_request *req,
562 struct dentry *dentry, int err)
564 if (err == -ENOENT) {
567 if (!req->r_reply_info.head->is_dentry) {
568 dout("ENOENT and no trace, dentry %p inode %p\n",
569 dentry, dentry->d_inode);
570 if (dentry->d_inode) {
579 dentry = ERR_PTR(err);
580 else if (dentry != req->r_dentry)
581 dentry = dget(req->r_dentry); /* we got spliced */
587 static int is_root_ceph_dentry(struct inode *inode, struct dentry *dentry)
589 return ceph_ino(inode) == CEPH_INO_ROOT &&
590 strncmp(dentry->d_name.name, ".ceph", 5) == 0;
594 * Look up a single dir entry. If there is a lookup intent, inform
595 * the MDS so that it gets our 'caps wanted' value in a single op.
597 static struct dentry *ceph_lookup(struct inode *dir, struct dentry *dentry,
600 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
601 struct ceph_mds_client *mdsc = fsc->mdsc;
602 struct ceph_mds_request *req;
606 dout("lookup %p dentry %p '%pd'\n",
607 dir, dentry, dentry);
609 if (dentry->d_name.len > NAME_MAX)
610 return ERR_PTR(-ENAMETOOLONG);
612 err = ceph_init_dentry(dentry);
616 /* can we conclude ENOENT locally? */
617 if (dentry->d_inode == NULL) {
618 struct ceph_inode_info *ci = ceph_inode(dir);
619 struct ceph_dentry_info *di = ceph_dentry(dentry);
621 spin_lock(&ci->i_ceph_lock);
622 dout(" dir %p flags are %d\n", dir, ci->i_ceph_flags);
623 if (strncmp(dentry->d_name.name,
624 fsc->mount_options->snapdir_name,
625 dentry->d_name.len) &&
626 !is_root_ceph_dentry(dir, dentry) &&
627 __ceph_dir_is_complete(ci) &&
628 (__ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1))) {
629 spin_unlock(&ci->i_ceph_lock);
630 dout(" dir %p complete, -ENOENT\n", dir);
632 di->lease_shared_gen = ci->i_shared_gen;
635 spin_unlock(&ci->i_ceph_lock);
638 op = ceph_snap(dir) == CEPH_SNAPDIR ?
639 CEPH_MDS_OP_LOOKUPSNAP : CEPH_MDS_OP_LOOKUP;
640 req = ceph_mdsc_create_request(mdsc, op, USE_ANY_MDS);
642 return ERR_CAST(req);
643 req->r_dentry = dget(dentry);
645 /* we only need inode linkage */
646 req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INODE);
647 req->r_locked_dir = dir;
648 err = ceph_mdsc_do_request(mdsc, NULL, req);
649 err = ceph_handle_snapdir(req, dentry, err);
650 dentry = ceph_finish_lookup(req, dentry, err);
651 ceph_mdsc_put_request(req); /* will dput(dentry) */
652 dout("lookup result=%p\n", dentry);
657 * If we do a create but get no trace back from the MDS, follow up with
658 * a lookup (the VFS expects us to link up the provided dentry).
660 int ceph_handle_notrace_create(struct inode *dir, struct dentry *dentry)
662 struct dentry *result = ceph_lookup(dir, dentry, 0);
664 if (result && !IS_ERR(result)) {
666 * We created the item, then did a lookup, and found
667 * it was already linked to another inode we already
668 * had in our cache (and thus got spliced). Link our
669 * dentry to that inode, but don't hash it, just in
670 * case the VFS wants to dereference it.
672 BUG_ON(!result->d_inode);
673 d_instantiate(dentry, result->d_inode);
676 return PTR_ERR(result);
679 static int ceph_mknod(struct inode *dir, struct dentry *dentry,
680 umode_t mode, dev_t rdev)
682 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
683 struct ceph_mds_client *mdsc = fsc->mdsc;
684 struct ceph_mds_request *req;
685 struct ceph_acls_info acls = {};
688 if (ceph_snap(dir) != CEPH_NOSNAP)
691 err = ceph_pre_init_acls(dir, &mode, &acls);
695 dout("mknod in dir %p dentry %p mode 0%ho rdev %d\n",
696 dir, dentry, mode, rdev);
697 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_MKNOD, USE_AUTH_MDS);
702 req->r_dentry = dget(dentry);
704 req->r_locked_dir = dir;
705 req->r_args.mknod.mode = cpu_to_le32(mode);
706 req->r_args.mknod.rdev = cpu_to_le32(rdev);
707 req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
708 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
710 req->r_pagelist = acls.pagelist;
711 acls.pagelist = NULL;
713 err = ceph_mdsc_do_request(mdsc, dir, req);
714 if (!err && !req->r_reply_info.head->is_dentry)
715 err = ceph_handle_notrace_create(dir, dentry);
716 ceph_mdsc_put_request(req);
719 ceph_init_inode_acls(dentry->d_inode, &acls);
722 ceph_release_acls_info(&acls);
726 static int ceph_create(struct inode *dir, struct dentry *dentry, umode_t mode,
729 return ceph_mknod(dir, dentry, mode, 0);
732 static int ceph_symlink(struct inode *dir, struct dentry *dentry,
735 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
736 struct ceph_mds_client *mdsc = fsc->mdsc;
737 struct ceph_mds_request *req;
740 if (ceph_snap(dir) != CEPH_NOSNAP)
743 dout("symlink in dir %p dentry %p to '%s'\n", dir, dentry, dest);
744 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SYMLINK, USE_AUTH_MDS);
749 req->r_dentry = dget(dentry);
751 req->r_path2 = kstrdup(dest, GFP_NOFS);
752 req->r_locked_dir = dir;
753 req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
754 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
755 err = ceph_mdsc_do_request(mdsc, dir, req);
756 if (!err && !req->r_reply_info.head->is_dentry)
757 err = ceph_handle_notrace_create(dir, dentry);
758 ceph_mdsc_put_request(req);
765 static int ceph_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
767 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
768 struct ceph_mds_client *mdsc = fsc->mdsc;
769 struct ceph_mds_request *req;
770 struct ceph_acls_info acls = {};
774 if (ceph_snap(dir) == CEPH_SNAPDIR) {
775 /* mkdir .snap/foo is a MKSNAP */
776 op = CEPH_MDS_OP_MKSNAP;
777 dout("mksnap dir %p snap '%pd' dn %p\n", dir,
779 } else if (ceph_snap(dir) == CEPH_NOSNAP) {
780 dout("mkdir dir %p dn %p mode 0%ho\n", dir, dentry, mode);
781 op = CEPH_MDS_OP_MKDIR;
787 err = ceph_pre_init_acls(dir, &mode, &acls);
791 req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS);
797 req->r_dentry = dget(dentry);
799 req->r_locked_dir = dir;
800 req->r_args.mkdir.mode = cpu_to_le32(mode);
801 req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
802 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
804 req->r_pagelist = acls.pagelist;
805 acls.pagelist = NULL;
807 err = ceph_mdsc_do_request(mdsc, dir, req);
808 if (!err && !req->r_reply_info.head->is_dentry)
809 err = ceph_handle_notrace_create(dir, dentry);
810 ceph_mdsc_put_request(req);
813 ceph_init_inode_acls(dentry->d_inode, &acls);
816 ceph_release_acls_info(&acls);
820 static int ceph_link(struct dentry *old_dentry, struct inode *dir,
821 struct dentry *dentry)
823 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
824 struct ceph_mds_client *mdsc = fsc->mdsc;
825 struct ceph_mds_request *req;
828 if (ceph_snap(dir) != CEPH_NOSNAP)
831 dout("link in dir %p old_dentry %p dentry %p\n", dir,
833 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_LINK, USE_AUTH_MDS);
838 req->r_dentry = dget(dentry);
840 req->r_old_dentry = dget(old_dentry);
841 req->r_locked_dir = dir;
842 req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
843 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
844 /* release LINK_SHARED on source inode (mds will lock it) */
845 req->r_old_inode_drop = CEPH_CAP_LINK_SHARED;
846 err = ceph_mdsc_do_request(mdsc, dir, req);
849 } else if (!req->r_reply_info.head->is_dentry) {
850 ihold(old_dentry->d_inode);
851 d_instantiate(dentry, old_dentry->d_inode);
853 ceph_mdsc_put_request(req);
858 * For a soon-to-be unlinked file, drop the AUTH_RDCACHE caps. If it
859 * looks like the link count will hit 0, drop any other caps (other
860 * than PIN) we don't specifically want (due to the file still being
863 static int drop_caps_for_unlink(struct inode *inode)
865 struct ceph_inode_info *ci = ceph_inode(inode);
866 int drop = CEPH_CAP_LINK_SHARED | CEPH_CAP_LINK_EXCL;
868 spin_lock(&ci->i_ceph_lock);
869 if (inode->i_nlink == 1) {
870 drop |= ~(__ceph_caps_wanted(ci) | CEPH_CAP_PIN);
871 ci->i_ceph_flags |= CEPH_I_NODELAY;
873 spin_unlock(&ci->i_ceph_lock);
878 * rmdir and unlink are differ only by the metadata op code
880 static int ceph_unlink(struct inode *dir, struct dentry *dentry)
882 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
883 struct ceph_mds_client *mdsc = fsc->mdsc;
884 struct inode *inode = dentry->d_inode;
885 struct ceph_mds_request *req;
889 if (ceph_snap(dir) == CEPH_SNAPDIR) {
890 /* rmdir .snap/foo is RMSNAP */
891 dout("rmsnap dir %p '%pd' dn %p\n", dir, dentry, dentry);
892 op = CEPH_MDS_OP_RMSNAP;
893 } else if (ceph_snap(dir) == CEPH_NOSNAP) {
894 dout("unlink/rmdir dir %p dn %p inode %p\n",
896 op = S_ISDIR(dentry->d_inode->i_mode) ?
897 CEPH_MDS_OP_RMDIR : CEPH_MDS_OP_UNLINK;
900 req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS);
905 req->r_dentry = dget(dentry);
907 req->r_locked_dir = dir;
908 req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
909 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
910 req->r_inode_drop = drop_caps_for_unlink(inode);
911 err = ceph_mdsc_do_request(mdsc, dir, req);
912 if (!err && !req->r_reply_info.head->is_dentry)
914 ceph_mdsc_put_request(req);
919 static int ceph_rename(struct inode *old_dir, struct dentry *old_dentry,
920 struct inode *new_dir, struct dentry *new_dentry)
922 struct ceph_fs_client *fsc = ceph_sb_to_client(old_dir->i_sb);
923 struct ceph_mds_client *mdsc = fsc->mdsc;
924 struct ceph_mds_request *req;
927 if (ceph_snap(old_dir) != ceph_snap(new_dir))
929 if (ceph_snap(old_dir) != CEPH_NOSNAP ||
930 ceph_snap(new_dir) != CEPH_NOSNAP)
932 dout("rename dir %p dentry %p to dir %p dentry %p\n",
933 old_dir, old_dentry, new_dir, new_dentry);
934 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_RENAME, USE_AUTH_MDS);
938 req->r_dentry = dget(new_dentry);
940 req->r_old_dentry = dget(old_dentry);
941 req->r_old_dentry_dir = old_dir;
942 req->r_locked_dir = new_dir;
943 req->r_old_dentry_drop = CEPH_CAP_FILE_SHARED;
944 req->r_old_dentry_unless = CEPH_CAP_FILE_EXCL;
945 req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
946 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
947 /* release LINK_RDCACHE on source inode (mds will lock it) */
948 req->r_old_inode_drop = CEPH_CAP_LINK_SHARED;
949 if (new_dentry->d_inode)
950 req->r_inode_drop = drop_caps_for_unlink(new_dentry->d_inode);
951 err = ceph_mdsc_do_request(mdsc, old_dir, req);
952 if (!err && !req->r_reply_info.head->is_dentry) {
954 * Normally d_move() is done by fill_trace (called by
955 * do_request, above). If there is no trace, we need
959 d_move(old_dentry, new_dentry);
961 /* ensure target dentry is invalidated, despite
962 rehashing bug in vfs_rename_dir */
963 ceph_invalidate_dentry_lease(new_dentry);
965 /* d_move screws up sibling dentries' offsets */
966 ceph_dir_clear_complete(old_dir);
967 ceph_dir_clear_complete(new_dir);
970 ceph_mdsc_put_request(req);
975 * Ensure a dentry lease will no longer revalidate.
977 void ceph_invalidate_dentry_lease(struct dentry *dentry)
979 spin_lock(&dentry->d_lock);
980 dentry->d_time = jiffies;
981 ceph_dentry(dentry)->lease_shared_gen = 0;
982 spin_unlock(&dentry->d_lock);
986 * Check if dentry lease is valid. If not, delete the lease. Try to
987 * renew if the least is more than half up.
989 static int dentry_lease_is_valid(struct dentry *dentry)
991 struct ceph_dentry_info *di;
992 struct ceph_mds_session *s;
996 struct ceph_mds_session *session = NULL;
997 struct inode *dir = NULL;
1000 spin_lock(&dentry->d_lock);
1001 di = ceph_dentry(dentry);
1002 if (di->lease_session) {
1003 s = di->lease_session;
1004 spin_lock(&s->s_gen_ttl_lock);
1007 spin_unlock(&s->s_gen_ttl_lock);
1009 if (di->lease_gen == gen &&
1010 time_before(jiffies, dentry->d_time) &&
1011 time_before(jiffies, ttl)) {
1013 if (di->lease_renew_after &&
1014 time_after(jiffies, di->lease_renew_after)) {
1015 /* we should renew */
1016 dir = dentry->d_parent->d_inode;
1017 session = ceph_get_mds_session(s);
1018 seq = di->lease_seq;
1019 di->lease_renew_after = 0;
1020 di->lease_renew_from = jiffies;
1024 spin_unlock(&dentry->d_lock);
1027 ceph_mdsc_lease_send_msg(session, dir, dentry,
1028 CEPH_MDS_LEASE_RENEW, seq);
1029 ceph_put_mds_session(session);
1031 dout("dentry_lease_is_valid - dentry %p = %d\n", dentry, valid);
1036 * Check if directory-wide content lease/cap is valid.
1038 static int dir_lease_is_valid(struct inode *dir, struct dentry *dentry)
1040 struct ceph_inode_info *ci = ceph_inode(dir);
1041 struct ceph_dentry_info *di = ceph_dentry(dentry);
1044 spin_lock(&ci->i_ceph_lock);
1045 if (ci->i_shared_gen == di->lease_shared_gen)
1046 valid = __ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1);
1047 spin_unlock(&ci->i_ceph_lock);
1048 dout("dir_lease_is_valid dir %p v%u dentry %p v%u = %d\n",
1049 dir, (unsigned)ci->i_shared_gen, dentry,
1050 (unsigned)di->lease_shared_gen, valid);
1055 * Check if cached dentry can be trusted.
1057 static int ceph_d_revalidate(struct dentry *dentry, unsigned int flags)
1062 if (flags & LOOKUP_RCU)
1065 dout("d_revalidate %p '%pd' inode %p offset %lld\n", dentry,
1066 dentry, dentry->d_inode, ceph_dentry(dentry)->offset);
1068 dir = ceph_get_dentry_parent_inode(dentry);
1070 /* always trust cached snapped dentries, snapdir dentry */
1071 if (ceph_snap(dir) != CEPH_NOSNAP) {
1072 dout("d_revalidate %p '%pd' inode %p is SNAPPED\n", dentry,
1073 dentry, dentry->d_inode);
1075 } else if (dentry->d_inode &&
1076 ceph_snap(dentry->d_inode) == CEPH_SNAPDIR) {
1078 } else if (dentry_lease_is_valid(dentry) ||
1079 dir_lease_is_valid(dir, dentry)) {
1080 if (dentry->d_inode)
1081 valid = ceph_is_any_caps(dentry->d_inode);
1086 dout("d_revalidate %p %s\n", dentry, valid ? "valid" : "invalid");
1088 ceph_dentry_lru_touch(dentry);
1090 ceph_dir_clear_complete(dir);
1097 * Release our ceph_dentry_info.
1099 static void ceph_d_release(struct dentry *dentry)
1101 struct ceph_dentry_info *di = ceph_dentry(dentry);
1103 dout("d_release %p\n", dentry);
1104 ceph_dentry_lru_del(dentry);
1105 if (di->lease_session)
1106 ceph_put_mds_session(di->lease_session);
1107 kmem_cache_free(ceph_dentry_cachep, di);
1108 dentry->d_fsdata = NULL;
1111 static int ceph_snapdir_d_revalidate(struct dentry *dentry,
1115 * Eventually, we'll want to revalidate snapped metadata
1116 * too... probably...
1122 * When the VFS prunes a dentry from the cache, we need to clear the
1123 * complete flag on the parent directory.
1125 * Called under dentry->d_lock.
1127 static void ceph_d_prune(struct dentry *dentry)
1129 dout("ceph_d_prune %p\n", dentry);
1131 /* do we have a valid parent? */
1132 if (IS_ROOT(dentry))
1135 /* if we are not hashed, we don't affect dir's completeness */
1136 if (d_unhashed(dentry))
1140 * we hold d_lock, so d_parent is stable, and d_fsdata is never
1141 * cleared until d_release
1143 ceph_dir_clear_complete(dentry->d_parent->d_inode);
1147 * read() on a dir. This weird interface hack only works if mounted
1148 * with '-o dirstat'.
1150 static ssize_t ceph_read_dir(struct file *file, char __user *buf, size_t size,
1153 struct ceph_file_info *cf = file->private_data;
1154 struct inode *inode = file_inode(file);
1155 struct ceph_inode_info *ci = ceph_inode(inode);
1157 const int bufsize = 1024;
1159 if (!ceph_test_mount_opt(ceph_sb_to_client(inode->i_sb), DIRSTAT))
1162 if (!cf->dir_info) {
1163 cf->dir_info = kmalloc(bufsize, GFP_NOFS);
1167 snprintf(cf->dir_info, bufsize,
1170 " subdirs: %20lld\n"
1171 "rentries: %20lld\n"
1173 " rsubdirs: %20lld\n"
1175 "rctime: %10ld.%09ld\n",
1176 ci->i_files + ci->i_subdirs,
1179 ci->i_rfiles + ci->i_rsubdirs,
1183 (long)ci->i_rctime.tv_sec,
1184 (long)ci->i_rctime.tv_nsec);
1187 if (*ppos >= cf->dir_info_len)
1189 size = min_t(unsigned, size, cf->dir_info_len-*ppos);
1190 left = copy_to_user(buf, cf->dir_info + *ppos, size);
1193 *ppos += (size - left);
1198 * an fsync() on a dir will wait for any uncommitted directory
1199 * operations to commit.
1201 static int ceph_dir_fsync(struct file *file, loff_t start, loff_t end,
1204 struct inode *inode = file_inode(file);
1205 struct ceph_inode_info *ci = ceph_inode(inode);
1206 struct list_head *head = &ci->i_unsafe_dirops;
1207 struct ceph_mds_request *req;
1211 dout("dir_fsync %p\n", inode);
1212 ret = filemap_write_and_wait_range(inode->i_mapping, start, end);
1215 mutex_lock(&inode->i_mutex);
1217 spin_lock(&ci->i_unsafe_lock);
1218 if (list_empty(head))
1221 req = list_entry(head->prev,
1222 struct ceph_mds_request, r_unsafe_dir_item);
1223 last_tid = req->r_tid;
1226 ceph_mdsc_get_request(req);
1227 spin_unlock(&ci->i_unsafe_lock);
1229 dout("dir_fsync %p wait on tid %llu (until %llu)\n",
1230 inode, req->r_tid, last_tid);
1231 if (req->r_timeout) {
1232 ret = wait_for_completion_timeout(
1233 &req->r_safe_completion, req->r_timeout);
1237 ret = -EIO; /* timed out */
1239 wait_for_completion(&req->r_safe_completion);
1241 ceph_mdsc_put_request(req);
1243 spin_lock(&ci->i_unsafe_lock);
1244 if (ret || list_empty(head))
1246 req = list_entry(head->next,
1247 struct ceph_mds_request, r_unsafe_dir_item);
1248 } while (req->r_tid < last_tid);
1250 spin_unlock(&ci->i_unsafe_lock);
1251 mutex_unlock(&inode->i_mutex);
1257 * We maintain a private dentry LRU.
1259 * FIXME: this needs to be changed to a per-mds lru to be useful.
1261 void ceph_dentry_lru_add(struct dentry *dn)
1263 struct ceph_dentry_info *di = ceph_dentry(dn);
1264 struct ceph_mds_client *mdsc;
1266 dout("dentry_lru_add %p %p '%pd'\n", di, dn, dn);
1267 mdsc = ceph_sb_to_client(dn->d_sb)->mdsc;
1268 spin_lock(&mdsc->dentry_lru_lock);
1269 list_add_tail(&di->lru, &mdsc->dentry_lru);
1271 spin_unlock(&mdsc->dentry_lru_lock);
1274 void ceph_dentry_lru_touch(struct dentry *dn)
1276 struct ceph_dentry_info *di = ceph_dentry(dn);
1277 struct ceph_mds_client *mdsc;
1279 dout("dentry_lru_touch %p %p '%pd' (offset %lld)\n", di, dn, dn,
1281 mdsc = ceph_sb_to_client(dn->d_sb)->mdsc;
1282 spin_lock(&mdsc->dentry_lru_lock);
1283 list_move_tail(&di->lru, &mdsc->dentry_lru);
1284 spin_unlock(&mdsc->dentry_lru_lock);
1287 void ceph_dentry_lru_del(struct dentry *dn)
1289 struct ceph_dentry_info *di = ceph_dentry(dn);
1290 struct ceph_mds_client *mdsc;
1292 dout("dentry_lru_del %p %p '%pd'\n", di, dn, dn);
1293 mdsc = ceph_sb_to_client(dn->d_sb)->mdsc;
1294 spin_lock(&mdsc->dentry_lru_lock);
1295 list_del_init(&di->lru);
1297 spin_unlock(&mdsc->dentry_lru_lock);
1301 * Return name hash for a given dentry. This is dependent on
1302 * the parent directory's hash function.
1304 unsigned ceph_dentry_hash(struct inode *dir, struct dentry *dn)
1306 struct ceph_inode_info *dci = ceph_inode(dir);
1308 switch (dci->i_dir_layout.dl_dir_hash) {
1309 case 0: /* for backward compat */
1310 case CEPH_STR_HASH_LINUX:
1311 return dn->d_name.hash;
1314 return ceph_str_hash(dci->i_dir_layout.dl_dir_hash,
1315 dn->d_name.name, dn->d_name.len);
1319 const struct file_operations ceph_dir_fops = {
1320 .read = ceph_read_dir,
1321 .iterate = ceph_readdir,
1322 .llseek = ceph_dir_llseek,
1324 .release = ceph_release,
1325 .unlocked_ioctl = ceph_ioctl,
1326 .fsync = ceph_dir_fsync,
1329 const struct inode_operations ceph_dir_iops = {
1330 .lookup = ceph_lookup,
1331 .permission = ceph_permission,
1332 .getattr = ceph_getattr,
1333 .setattr = ceph_setattr,
1334 .setxattr = ceph_setxattr,
1335 .getxattr = ceph_getxattr,
1336 .listxattr = ceph_listxattr,
1337 .removexattr = ceph_removexattr,
1338 .get_acl = ceph_get_acl,
1339 .set_acl = ceph_set_acl,
1340 .mknod = ceph_mknod,
1341 .symlink = ceph_symlink,
1342 .mkdir = ceph_mkdir,
1344 .unlink = ceph_unlink,
1345 .rmdir = ceph_unlink,
1346 .rename = ceph_rename,
1347 .create = ceph_create,
1348 .atomic_open = ceph_atomic_open,
1351 const struct dentry_operations ceph_dentry_ops = {
1352 .d_revalidate = ceph_d_revalidate,
1353 .d_release = ceph_d_release,
1354 .d_prune = ceph_d_prune,
1357 const struct dentry_operations ceph_snapdir_dentry_ops = {
1358 .d_revalidate = ceph_snapdir_d_revalidate,
1359 .d_release = ceph_d_release,
1362 const struct dentry_operations ceph_snap_dentry_ops = {
1363 .d_release = ceph_d_release,
1364 .d_prune = ceph_d_prune,