1 // SPDX-License-Identifier: GPL-2.0
2 #include <linux/ceph/ceph_debug.h>
4 #include <linux/spinlock.h>
5 #include <linux/namei.h>
6 #include <linux/slab.h>
7 #include <linux/sched.h>
8 #include <linux/xattr.h>
11 #include "mds_client.h"
14 * Directory operations: readdir, lookup, create, link, unlink,
19 * Ceph MDS operations are specified in terms of a base ino and
20 * relative path. Thus, the client can specify an operation on a
21 * specific inode (e.g., a getattr due to fstat(2)), or as a path
22 * relative to, say, the root directory.
24 * Normally, we limit ourselves to strict inode ops (no path component)
25 * or dentry operations (a single path component relative to an ino). The
26 * exception to this is open_root_dentry(), which will open the mount
30 const struct dentry_operations ceph_dentry_ops;
32 static bool __dentry_lease_is_valid(struct ceph_dentry_info *di);
33 static int __dir_lease_try_check(const struct dentry *dentry);
36 * Initialize ceph dentry state.
38 static int ceph_d_init(struct dentry *dentry)
40 struct ceph_dentry_info *di;
41 struct ceph_fs_client *fsc = ceph_sb_to_client(dentry->d_sb);
42 struct ceph_mds_client *mdsc = fsc->mdsc;
44 di = kmem_cache_zalloc(ceph_dentry_cachep, GFP_KERNEL);
46 return -ENOMEM; /* oh well */
49 di->lease_session = NULL;
51 dentry->d_fsdata = di;
52 INIT_LIST_HEAD(&di->lease_list);
54 atomic64_inc(&mdsc->metric.total_dentries);
60 * for f_pos for readdir:
62 * (0xff << 52) | ((24 bits hash) << 28) |
63 * (the nth entry has hash collision);
65 * ((frag value) << 28) | (the nth entry in frag);
67 #define OFFSET_BITS 28
68 #define OFFSET_MASK ((1 << OFFSET_BITS) - 1)
69 #define HASH_ORDER (0xffull << (OFFSET_BITS + 24))
70 loff_t ceph_make_fpos(unsigned high, unsigned off, bool hash_order)
72 loff_t fpos = ((loff_t)high << 28) | (loff_t)off;
78 static bool is_hash_order(loff_t p)
80 return (p & HASH_ORDER) == HASH_ORDER;
83 static unsigned fpos_frag(loff_t p)
85 return p >> OFFSET_BITS;
88 static unsigned fpos_hash(loff_t p)
90 return ceph_frag_value(fpos_frag(p));
93 static unsigned fpos_off(loff_t p)
95 return p & OFFSET_MASK;
98 static int fpos_cmp(loff_t l, loff_t r)
100 int v = ceph_frag_compare(fpos_frag(l), fpos_frag(r));
103 return (int)(fpos_off(l) - fpos_off(r));
107 * make note of the last dentry we read, so we can
108 * continue at the same lexicographical point,
109 * regardless of what dir changes take place on the
112 static int note_last_dentry(struct ceph_dir_file_info *dfi, const char *name,
113 int len, unsigned next_offset)
115 char *buf = kmalloc(len+1, GFP_KERNEL);
118 kfree(dfi->last_name);
119 dfi->last_name = buf;
120 memcpy(dfi->last_name, name, len);
121 dfi->last_name[len] = 0;
122 dfi->next_offset = next_offset;
123 dout("note_last_dentry '%s'\n", dfi->last_name);
128 static struct dentry *
129 __dcache_find_get_entry(struct dentry *parent, u64 idx,
130 struct ceph_readdir_cache_control *cache_ctl)
132 struct inode *dir = d_inode(parent);
133 struct dentry *dentry;
134 unsigned idx_mask = (PAGE_SIZE / sizeof(struct dentry *)) - 1;
135 loff_t ptr_pos = idx * sizeof(struct dentry *);
136 pgoff_t ptr_pgoff = ptr_pos >> PAGE_SHIFT;
138 if (ptr_pos >= i_size_read(dir))
141 if (!cache_ctl->page || ptr_pgoff != page_index(cache_ctl->page)) {
142 ceph_readdir_cache_release(cache_ctl);
143 cache_ctl->page = find_lock_page(&dir->i_data, ptr_pgoff);
144 if (!cache_ctl->page) {
145 dout(" page %lu not found\n", ptr_pgoff);
146 return ERR_PTR(-EAGAIN);
148 /* reading/filling the cache are serialized by
149 i_mutex, no need to use page lock */
150 unlock_page(cache_ctl->page);
151 cache_ctl->dentries = kmap(cache_ctl->page);
154 cache_ctl->index = idx & idx_mask;
157 spin_lock(&parent->d_lock);
158 /* check i_size again here, because empty directory can be
159 * marked as complete while not holding the i_mutex. */
160 if (ceph_dir_is_complete_ordered(dir) && ptr_pos < i_size_read(dir))
161 dentry = cache_ctl->dentries[cache_ctl->index];
164 spin_unlock(&parent->d_lock);
165 if (dentry && !lockref_get_not_dead(&dentry->d_lockref))
168 return dentry ? : ERR_PTR(-EAGAIN);
172 * When possible, we try to satisfy a readdir by peeking at the
173 * dcache. We make this work by carefully ordering dentries on
174 * d_child when we initially get results back from the MDS, and
175 * falling back to a "normal" sync readdir if any dentries in the dir
178 * Complete dir indicates that we have all dentries in the dir. It is
179 * defined IFF we hold CEPH_CAP_FILE_SHARED (which will be revoked by
180 * the MDS if/when the directory is modified).
182 static int __dcache_readdir(struct file *file, struct dir_context *ctx,
185 struct ceph_dir_file_info *dfi = file->private_data;
186 struct dentry *parent = file->f_path.dentry;
187 struct inode *dir = d_inode(parent);
188 struct dentry *dentry, *last = NULL;
189 struct ceph_dentry_info *di;
190 struct ceph_readdir_cache_control cache_ctl = {};
194 dout("__dcache_readdir %p v%u at %llx\n", dir, (unsigned)shared_gen, ctx->pos);
196 /* search start position */
198 u64 count = div_u64(i_size_read(dir), sizeof(struct dentry *));
200 u64 step = count >> 1;
201 dentry = __dcache_find_get_entry(parent, idx + step,
204 /* use linar search */
208 if (IS_ERR(dentry)) {
209 err = PTR_ERR(dentry);
212 di = ceph_dentry(dentry);
213 spin_lock(&dentry->d_lock);
214 if (fpos_cmp(di->offset, ctx->pos) < 0) {
220 spin_unlock(&dentry->d_lock);
224 dout("__dcache_readdir %p cache idx %llu\n", dir, idx);
229 bool emit_dentry = false;
230 dentry = __dcache_find_get_entry(parent, idx++, &cache_ctl);
232 dfi->file_info.flags |= CEPH_F_ATEND;
236 if (IS_ERR(dentry)) {
237 err = PTR_ERR(dentry);
241 spin_lock(&dentry->d_lock);
242 di = ceph_dentry(dentry);
243 if (d_unhashed(dentry) ||
244 d_really_is_negative(dentry) ||
245 di->lease_shared_gen != shared_gen) {
246 spin_unlock(&dentry->d_lock);
251 if (fpos_cmp(ctx->pos, di->offset) <= 0) {
252 __ceph_dentry_dir_lease_touch(di);
255 spin_unlock(&dentry->d_lock);
258 dout(" %llx dentry %p %pd %p\n", di->offset,
259 dentry, dentry, d_inode(dentry));
260 ctx->pos = di->offset;
261 if (!dir_emit(ctx, dentry->d_name.name,
262 dentry->d_name.len, ceph_present_inode(d_inode(dentry)),
263 d_inode(dentry)->i_mode >> 12)) {
278 ceph_readdir_cache_release(&cache_ctl);
281 di = ceph_dentry(last);
282 ret = note_last_dentry(dfi, last->d_name.name, last->d_name.len,
283 fpos_off(di->offset) + 1);
287 /* last_name no longer match cache index */
288 if (dfi->readdir_cache_idx >= 0) {
289 dfi->readdir_cache_idx = -1;
290 dfi->dir_release_count = 0;
296 static bool need_send_readdir(struct ceph_dir_file_info *dfi, loff_t pos)
298 if (!dfi->last_readdir)
300 if (is_hash_order(pos))
301 return !ceph_frag_contains_value(dfi->frag, fpos_hash(pos));
303 return dfi->frag != fpos_frag(pos);
306 static int ceph_readdir(struct file *file, struct dir_context *ctx)
308 struct ceph_dir_file_info *dfi = file->private_data;
309 struct inode *inode = file_inode(file);
310 struct ceph_inode_info *ci = ceph_inode(inode);
311 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
312 struct ceph_mds_client *mdsc = fsc->mdsc;
316 struct ceph_mds_reply_info_parsed *rinfo;
318 dout("readdir %p file %p pos %llx\n", inode, file, ctx->pos);
319 if (dfi->file_info.flags & CEPH_F_ATEND)
322 /* always start with . and .. */
324 dout("readdir off 0 -> '.'\n");
325 if (!dir_emit(ctx, ".", 1, ceph_present_inode(inode),
326 inode->i_mode >> 12))
332 struct dentry *dentry = file->f_path.dentry;
334 spin_lock(&dentry->d_lock);
335 ino = ceph_present_inode(dentry->d_parent->d_inode);
336 spin_unlock(&dentry->d_lock);
338 dout("readdir off 1 -> '..'\n");
339 if (!dir_emit(ctx, "..", 2, ino, inode->i_mode >> 12))
344 spin_lock(&ci->i_ceph_lock);
345 /* request Fx cap. if have Fx, we don't need to release Fs cap
346 * for later create/unlink. */
347 __ceph_touch_fmode(ci, mdsc, CEPH_FILE_MODE_WR);
348 /* can we use the dcache? */
349 if (ceph_test_mount_opt(fsc, DCACHE) &&
350 !ceph_test_mount_opt(fsc, NOASYNCREADDIR) &&
351 ceph_snap(inode) != CEPH_SNAPDIR &&
352 __ceph_dir_is_complete_ordered(ci) &&
353 __ceph_caps_issued_mask_metric(ci, CEPH_CAP_FILE_SHARED, 1)) {
354 int shared_gen = atomic_read(&ci->i_shared_gen);
356 spin_unlock(&ci->i_ceph_lock);
357 err = __dcache_readdir(file, ctx, shared_gen);
361 spin_unlock(&ci->i_ceph_lock);
364 /* proceed with a normal readdir */
366 /* do we have the correct frag content buffered? */
367 if (need_send_readdir(dfi, ctx->pos)) {
368 struct ceph_mds_request *req;
369 int op = ceph_snap(inode) == CEPH_SNAPDIR ?
370 CEPH_MDS_OP_LSSNAP : CEPH_MDS_OP_READDIR;
372 /* discard old result, if any */
373 if (dfi->last_readdir) {
374 ceph_mdsc_put_request(dfi->last_readdir);
375 dfi->last_readdir = NULL;
378 if (is_hash_order(ctx->pos)) {
379 /* fragtree isn't always accurate. choose frag
380 * based on previous reply when possible. */
381 if (frag == (unsigned)-1)
382 frag = ceph_choose_frag(ci, fpos_hash(ctx->pos),
385 frag = fpos_frag(ctx->pos);
388 dout("readdir fetching %llx.%llx frag %x offset '%s'\n",
389 ceph_vinop(inode), frag, dfi->last_name);
390 req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS);
393 err = ceph_alloc_readdir_reply_buffer(req, inode);
395 ceph_mdsc_put_request(req);
398 /* hints to request -> mds selection code */
399 req->r_direct_mode = USE_AUTH_MDS;
400 if (op == CEPH_MDS_OP_READDIR) {
401 req->r_direct_hash = ceph_frag_value(frag);
402 __set_bit(CEPH_MDS_R_DIRECT_IS_HASH, &req->r_req_flags);
403 req->r_inode_drop = CEPH_CAP_FILE_EXCL;
405 if (dfi->last_name) {
406 req->r_path2 = kstrdup(dfi->last_name, GFP_KERNEL);
408 ceph_mdsc_put_request(req);
411 } else if (is_hash_order(ctx->pos)) {
412 req->r_args.readdir.offset_hash =
413 cpu_to_le32(fpos_hash(ctx->pos));
416 req->r_dir_release_cnt = dfi->dir_release_count;
417 req->r_dir_ordered_cnt = dfi->dir_ordered_count;
418 req->r_readdir_cache_idx = dfi->readdir_cache_idx;
419 req->r_readdir_offset = dfi->next_offset;
420 req->r_args.readdir.frag = cpu_to_le32(frag);
421 req->r_args.readdir.flags =
422 cpu_to_le16(CEPH_READDIR_REPLY_BITFLAGS);
424 req->r_inode = inode;
426 req->r_dentry = dget(file->f_path.dentry);
427 err = ceph_mdsc_do_request(mdsc, NULL, req);
429 ceph_mdsc_put_request(req);
432 dout("readdir got and parsed readdir result=%d on "
433 "frag %x, end=%d, complete=%d, hash_order=%d\n",
435 (int)req->r_reply_info.dir_end,
436 (int)req->r_reply_info.dir_complete,
437 (int)req->r_reply_info.hash_order);
439 rinfo = &req->r_reply_info;
440 if (le32_to_cpu(rinfo->dir_dir->frag) != frag) {
441 frag = le32_to_cpu(rinfo->dir_dir->frag);
442 if (!rinfo->hash_order) {
443 dfi->next_offset = req->r_readdir_offset;
444 /* adjust ctx->pos to beginning of frag */
445 ctx->pos = ceph_make_fpos(frag,
452 dfi->last_readdir = req;
454 if (test_bit(CEPH_MDS_R_DID_PREPOPULATE, &req->r_req_flags)) {
455 dfi->readdir_cache_idx = req->r_readdir_cache_idx;
456 if (dfi->readdir_cache_idx < 0) {
457 /* preclude from marking dir ordered */
458 dfi->dir_ordered_count = 0;
459 } else if (ceph_frag_is_leftmost(frag) &&
460 dfi->next_offset == 2) {
461 /* note dir version at start of readdir so
462 * we can tell if any dentries get dropped */
463 dfi->dir_release_count = req->r_dir_release_cnt;
464 dfi->dir_ordered_count = req->r_dir_ordered_cnt;
467 dout("readdir !did_prepopulate\n");
468 /* disable readdir cache */
469 dfi->readdir_cache_idx = -1;
470 /* preclude from marking dir complete */
471 dfi->dir_release_count = 0;
474 /* note next offset and last dentry name */
475 if (rinfo->dir_nr > 0) {
476 struct ceph_mds_reply_dir_entry *rde =
477 rinfo->dir_entries + (rinfo->dir_nr-1);
478 unsigned next_offset = req->r_reply_info.dir_end ?
479 2 : (fpos_off(rde->offset) + 1);
480 err = note_last_dentry(dfi, rde->name, rde->name_len,
484 } else if (req->r_reply_info.dir_end) {
485 dfi->next_offset = 2;
490 rinfo = &dfi->last_readdir->r_reply_info;
491 dout("readdir frag %x num %d pos %llx chunk first %llx\n",
492 dfi->frag, rinfo->dir_nr, ctx->pos,
493 rinfo->dir_nr ? rinfo->dir_entries[0].offset : 0LL);
496 /* search start position */
497 if (rinfo->dir_nr > 0) {
498 int step, nr = rinfo->dir_nr;
501 if (rinfo->dir_entries[i + step].offset < ctx->pos) {
509 for (; i < rinfo->dir_nr; i++) {
510 struct ceph_mds_reply_dir_entry *rde = rinfo->dir_entries + i;
512 BUG_ON(rde->offset < ctx->pos);
514 ctx->pos = rde->offset;
515 dout("readdir (%d/%d) -> %llx '%.*s' %p\n",
516 i, rinfo->dir_nr, ctx->pos,
517 rde->name_len, rde->name, &rde->inode.in);
519 BUG_ON(!rde->inode.in);
521 if (!dir_emit(ctx, rde->name, rde->name_len,
522 ceph_present_ino(inode->i_sb, le64_to_cpu(rde->inode.in->ino)),
523 le32_to_cpu(rde->inode.in->mode) >> 12)) {
524 dout("filldir stopping us...\n");
530 ceph_mdsc_put_request(dfi->last_readdir);
531 dfi->last_readdir = NULL;
533 if (dfi->next_offset > 2) {
539 if (!ceph_frag_is_rightmost(dfi->frag)) {
540 frag = ceph_frag_next(dfi->frag);
541 if (is_hash_order(ctx->pos)) {
542 loff_t new_pos = ceph_make_fpos(ceph_frag_value(frag),
543 dfi->next_offset, true);
544 if (new_pos > ctx->pos)
548 ctx->pos = ceph_make_fpos(frag, dfi->next_offset,
550 kfree(dfi->last_name);
551 dfi->last_name = NULL;
553 dout("readdir next frag is %x\n", frag);
556 dfi->file_info.flags |= CEPH_F_ATEND;
559 * if dir_release_count still matches the dir, no dentries
560 * were released during the whole readdir, and we should have
561 * the complete dir contents in our cache.
563 if (atomic64_read(&ci->i_release_count) ==
564 dfi->dir_release_count) {
565 spin_lock(&ci->i_ceph_lock);
566 if (dfi->dir_ordered_count ==
567 atomic64_read(&ci->i_ordered_count)) {
568 dout(" marking %p complete and ordered\n", inode);
569 /* use i_size to track number of entries in
571 BUG_ON(dfi->readdir_cache_idx < 0);
572 i_size_write(inode, dfi->readdir_cache_idx *
573 sizeof(struct dentry*));
575 dout(" marking %p complete\n", inode);
577 __ceph_dir_set_complete(ci, dfi->dir_release_count,
578 dfi->dir_ordered_count);
579 spin_unlock(&ci->i_ceph_lock);
582 dout("readdir %p file %p done.\n", inode, file);
586 static void reset_readdir(struct ceph_dir_file_info *dfi)
588 if (dfi->last_readdir) {
589 ceph_mdsc_put_request(dfi->last_readdir);
590 dfi->last_readdir = NULL;
592 kfree(dfi->last_name);
593 dfi->last_name = NULL;
594 dfi->dir_release_count = 0;
595 dfi->readdir_cache_idx = -1;
596 dfi->next_offset = 2; /* compensate for . and .. */
597 dfi->file_info.flags &= ~CEPH_F_ATEND;
601 * discard buffered readdir content on seekdir(0), or seek to new frag,
602 * or seek prior to current chunk
604 static bool need_reset_readdir(struct ceph_dir_file_info *dfi, loff_t new_pos)
606 struct ceph_mds_reply_info_parsed *rinfo;
610 if (is_hash_order(new_pos)) {
611 /* no need to reset last_name for a forward seek when
612 * dentries are sotred in hash order */
613 } else if (dfi->frag != fpos_frag(new_pos)) {
616 rinfo = dfi->last_readdir ? &dfi->last_readdir->r_reply_info : NULL;
617 if (!rinfo || !rinfo->dir_nr)
619 chunk_offset = rinfo->dir_entries[0].offset;
620 return new_pos < chunk_offset ||
621 is_hash_order(new_pos) != is_hash_order(chunk_offset);
624 static loff_t ceph_dir_llseek(struct file *file, loff_t offset, int whence)
626 struct ceph_dir_file_info *dfi = file->private_data;
627 struct inode *inode = file->f_mapping->host;
634 offset += file->f_pos;
638 retval = -EOPNOTSUPP;
644 if (need_reset_readdir(dfi, offset)) {
645 dout("dir_llseek dropping %p content\n", file);
647 } else if (is_hash_order(offset) && offset > file->f_pos) {
648 /* for hash offset, we don't know if a forward seek
649 * is within same frag */
650 dfi->dir_release_count = 0;
651 dfi->readdir_cache_idx = -1;
654 if (offset != file->f_pos) {
655 file->f_pos = offset;
657 dfi->file_info.flags &= ~CEPH_F_ATEND;
667 * Handle lookups for the hidden .snap directory.
669 int ceph_handle_snapdir(struct ceph_mds_request *req,
670 struct dentry *dentry, int err)
672 struct ceph_fs_client *fsc = ceph_sb_to_client(dentry->d_sb);
673 struct inode *parent = d_inode(dentry->d_parent); /* we hold i_mutex */
676 if (err == -ENOENT &&
677 ceph_snap(parent) == CEPH_NOSNAP &&
678 strcmp(dentry->d_name.name,
679 fsc->mount_options->snapdir_name) == 0) {
680 struct inode *inode = ceph_get_snapdir(parent);
681 dout("ENOENT on snapdir %p '%pd', linking to snapdir %p\n",
682 dentry, dentry, inode);
683 BUG_ON(!d_unhashed(dentry));
684 d_add(dentry, inode);
691 * Figure out final result of a lookup/open request.
693 * Mainly, make sure we return the final req->r_dentry (if it already
694 * existed) in place of the original VFS-provided dentry when they
697 * Gracefully handle the case where the MDS replies with -ENOENT and
698 * no trace (which it may do, at its discretion, e.g., if it doesn't
699 * care to issue a lease on the negative dentry).
701 struct dentry *ceph_finish_lookup(struct ceph_mds_request *req,
702 struct dentry *dentry, int err)
704 if (err == -ENOENT) {
707 if (!req->r_reply_info.head->is_dentry) {
708 dout("ENOENT and no trace, dentry %p inode %p\n",
709 dentry, d_inode(dentry));
710 if (d_really_is_positive(dentry)) {
719 dentry = ERR_PTR(err);
720 else if (dentry != req->r_dentry)
721 dentry = dget(req->r_dentry); /* we got spliced */
727 static bool is_root_ceph_dentry(struct inode *inode, struct dentry *dentry)
729 return ceph_ino(inode) == CEPH_INO_ROOT &&
730 strncmp(dentry->d_name.name, ".ceph", 5) == 0;
734 * Look up a single dir entry. If there is a lookup intent, inform
735 * the MDS so that it gets our 'caps wanted' value in a single op.
737 static struct dentry *ceph_lookup(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;
747 dout("lookup %p dentry %p '%pd'\n",
748 dir, dentry, dentry);
750 if (dentry->d_name.len > NAME_MAX)
751 return ERR_PTR(-ENAMETOOLONG);
753 /* can we conclude ENOENT locally? */
754 if (d_really_is_negative(dentry)) {
755 struct ceph_inode_info *ci = ceph_inode(dir);
756 struct ceph_dentry_info *di = ceph_dentry(dentry);
758 spin_lock(&ci->i_ceph_lock);
759 dout(" dir %p flags are 0x%lx\n", dir, ci->i_ceph_flags);
760 if (strncmp(dentry->d_name.name,
761 fsc->mount_options->snapdir_name,
762 dentry->d_name.len) &&
763 !is_root_ceph_dentry(dir, dentry) &&
764 ceph_test_mount_opt(fsc, DCACHE) &&
765 __ceph_dir_is_complete(ci) &&
766 __ceph_caps_issued_mask_metric(ci, CEPH_CAP_FILE_SHARED, 1)) {
767 __ceph_touch_fmode(ci, mdsc, CEPH_FILE_MODE_RD);
768 spin_unlock(&ci->i_ceph_lock);
769 dout(" dir %p complete, -ENOENT\n", dir);
771 di->lease_shared_gen = atomic_read(&ci->i_shared_gen);
774 spin_unlock(&ci->i_ceph_lock);
777 op = ceph_snap(dir) == CEPH_SNAPDIR ?
778 CEPH_MDS_OP_LOOKUPSNAP : CEPH_MDS_OP_LOOKUP;
779 req = ceph_mdsc_create_request(mdsc, op, USE_ANY_MDS);
781 return ERR_CAST(req);
782 req->r_dentry = dget(dentry);
785 mask = CEPH_STAT_CAP_INODE | CEPH_CAP_AUTH_SHARED;
786 if (ceph_security_xattr_wanted(dir))
787 mask |= CEPH_CAP_XATTR_SHARED;
788 req->r_args.getattr.mask = cpu_to_le32(mask);
791 set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags);
792 err = ceph_mdsc_do_request(mdsc, NULL, req);
793 err = ceph_handle_snapdir(req, dentry, err);
794 dentry = ceph_finish_lookup(req, dentry, err);
795 ceph_mdsc_put_request(req); /* will dput(dentry) */
796 dout("lookup result=%p\n", dentry);
801 * If we do a create but get no trace back from the MDS, follow up with
802 * a lookup (the VFS expects us to link up the provided dentry).
804 int ceph_handle_notrace_create(struct inode *dir, struct dentry *dentry)
806 struct dentry *result = ceph_lookup(dir, dentry, 0);
808 if (result && !IS_ERR(result)) {
810 * We created the item, then did a lookup, and found
811 * it was already linked to another inode we already
812 * had in our cache (and thus got spliced). To not
813 * confuse VFS (especially when inode is a directory),
814 * we don't link our dentry to that inode, return an
817 * This event should be rare and it happens only when
818 * we talk to old MDS. Recent MDS does not send traceless
819 * reply for request that creates new inode.
824 return PTR_ERR(result);
827 static int ceph_mknod(struct inode *dir, struct dentry *dentry,
828 umode_t mode, dev_t rdev)
830 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
831 struct ceph_mds_client *mdsc = fsc->mdsc;
832 struct ceph_mds_request *req;
833 struct ceph_acl_sec_ctx as_ctx = {};
836 if (ceph_snap(dir) != CEPH_NOSNAP)
839 if (ceph_quota_is_max_files_exceeded(dir)) {
844 err = ceph_pre_init_acls(dir, &mode, &as_ctx);
847 err = ceph_security_init_secctx(dentry, mode, &as_ctx);
851 dout("mknod in dir %p dentry %p mode 0%ho rdev %d\n",
852 dir, dentry, mode, rdev);
853 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_MKNOD, USE_AUTH_MDS);
858 req->r_dentry = dget(dentry);
861 set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags);
862 req->r_args.mknod.mode = cpu_to_le32(mode);
863 req->r_args.mknod.rdev = cpu_to_le32(rdev);
864 req->r_dentry_drop = CEPH_CAP_FILE_SHARED | CEPH_CAP_AUTH_EXCL;
865 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
866 if (as_ctx.pagelist) {
867 req->r_pagelist = as_ctx.pagelist;
868 as_ctx.pagelist = NULL;
870 err = ceph_mdsc_do_request(mdsc, dir, req);
871 if (!err && !req->r_reply_info.head->is_dentry)
872 err = ceph_handle_notrace_create(dir, dentry);
873 ceph_mdsc_put_request(req);
876 ceph_init_inode_acls(d_inode(dentry), &as_ctx);
879 ceph_release_acl_sec_ctx(&as_ctx);
883 static int ceph_create(struct inode *dir, struct dentry *dentry, umode_t mode,
886 return ceph_mknod(dir, dentry, mode, 0);
889 static int ceph_symlink(struct inode *dir, struct dentry *dentry,
892 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
893 struct ceph_mds_client *mdsc = fsc->mdsc;
894 struct ceph_mds_request *req;
895 struct ceph_acl_sec_ctx as_ctx = {};
898 if (ceph_snap(dir) != CEPH_NOSNAP)
901 if (ceph_quota_is_max_files_exceeded(dir)) {
906 err = ceph_security_init_secctx(dentry, S_IFLNK | 0777, &as_ctx);
910 dout("symlink in dir %p dentry %p to '%s'\n", dir, dentry, dest);
911 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SYMLINK, USE_AUTH_MDS);
916 req->r_path2 = kstrdup(dest, GFP_KERNEL);
919 ceph_mdsc_put_request(req);
923 set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags);
924 req->r_dentry = dget(dentry);
926 req->r_dentry_drop = CEPH_CAP_FILE_SHARED | CEPH_CAP_AUTH_EXCL;
927 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
928 if (as_ctx.pagelist) {
929 req->r_pagelist = as_ctx.pagelist;
930 as_ctx.pagelist = NULL;
932 err = ceph_mdsc_do_request(mdsc, dir, req);
933 if (!err && !req->r_reply_info.head->is_dentry)
934 err = ceph_handle_notrace_create(dir, dentry);
935 ceph_mdsc_put_request(req);
939 ceph_release_acl_sec_ctx(&as_ctx);
943 static int ceph_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
945 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
946 struct ceph_mds_client *mdsc = fsc->mdsc;
947 struct ceph_mds_request *req;
948 struct ceph_acl_sec_ctx as_ctx = {};
952 if (ceph_snap(dir) == CEPH_SNAPDIR) {
953 /* mkdir .snap/foo is a MKSNAP */
954 op = CEPH_MDS_OP_MKSNAP;
955 dout("mksnap dir %p snap '%pd' dn %p\n", dir,
957 } else if (ceph_snap(dir) == CEPH_NOSNAP) {
958 dout("mkdir dir %p dn %p mode 0%ho\n", dir, dentry, mode);
959 op = CEPH_MDS_OP_MKDIR;
964 if (op == CEPH_MDS_OP_MKDIR &&
965 ceph_quota_is_max_files_exceeded(dir)) {
971 err = ceph_pre_init_acls(dir, &mode, &as_ctx);
974 err = ceph_security_init_secctx(dentry, mode, &as_ctx);
978 req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS);
984 req->r_dentry = dget(dentry);
987 set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags);
988 req->r_args.mkdir.mode = cpu_to_le32(mode);
989 req->r_dentry_drop = CEPH_CAP_FILE_SHARED | CEPH_CAP_AUTH_EXCL;
990 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
991 if (as_ctx.pagelist) {
992 req->r_pagelist = as_ctx.pagelist;
993 as_ctx.pagelist = NULL;
995 err = ceph_mdsc_do_request(mdsc, dir, req);
997 !req->r_reply_info.head->is_target &&
998 !req->r_reply_info.head->is_dentry)
999 err = ceph_handle_notrace_create(dir, dentry);
1000 ceph_mdsc_put_request(req);
1003 ceph_init_inode_acls(d_inode(dentry), &as_ctx);
1006 ceph_release_acl_sec_ctx(&as_ctx);
1010 static int ceph_link(struct dentry *old_dentry, struct inode *dir,
1011 struct dentry *dentry)
1013 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
1014 struct ceph_mds_client *mdsc = fsc->mdsc;
1015 struct ceph_mds_request *req;
1018 if (ceph_snap(dir) != CEPH_NOSNAP)
1021 dout("link in dir %p old_dentry %p dentry %p\n", dir,
1022 old_dentry, dentry);
1023 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_LINK, USE_AUTH_MDS);
1026 return PTR_ERR(req);
1028 req->r_dentry = dget(dentry);
1029 req->r_num_caps = 2;
1030 req->r_old_dentry = dget(old_dentry);
1031 req->r_parent = dir;
1032 set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags);
1033 req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
1034 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
1035 /* release LINK_SHARED on source inode (mds will lock it) */
1036 req->r_old_inode_drop = CEPH_CAP_LINK_SHARED | CEPH_CAP_LINK_EXCL;
1037 err = ceph_mdsc_do_request(mdsc, dir, req);
1040 } else if (!req->r_reply_info.head->is_dentry) {
1041 ihold(d_inode(old_dentry));
1042 d_instantiate(dentry, d_inode(old_dentry));
1044 ceph_mdsc_put_request(req);
1048 static void ceph_async_unlink_cb(struct ceph_mds_client *mdsc,
1049 struct ceph_mds_request *req)
1051 int result = req->r_err ? req->r_err :
1052 le32_to_cpu(req->r_reply_info.head->result);
1054 if (result == -EJUKEBOX)
1057 /* If op failed, mark everyone involved for errors */
1061 char *path = ceph_mdsc_build_path(req->r_dentry, &pathlen,
1064 /* mark error on parent + clear complete */
1065 mapping_set_error(req->r_parent->i_mapping, result);
1066 ceph_dir_clear_complete(req->r_parent);
1068 /* drop the dentry -- we don't know its status */
1069 if (!d_unhashed(req->r_dentry))
1070 d_drop(req->r_dentry);
1072 /* mark inode itself for an error (since metadata is bogus) */
1073 mapping_set_error(req->r_old_inode->i_mapping, result);
1075 pr_warn("ceph: async unlink failure path=(%llx)%s result=%d!\n",
1076 base, IS_ERR(path) ? "<<bad>>" : path, result);
1077 ceph_mdsc_free_path(path, pathlen);
1080 iput(req->r_old_inode);
1081 ceph_mdsc_release_dir_caps(req);
1084 static int get_caps_for_async_unlink(struct inode *dir, struct dentry *dentry)
1086 struct ceph_inode_info *ci = ceph_inode(dir);
1087 struct ceph_dentry_info *di;
1088 int got = 0, want = CEPH_CAP_FILE_EXCL | CEPH_CAP_DIR_UNLINK;
1090 spin_lock(&ci->i_ceph_lock);
1091 if ((__ceph_caps_issued(ci, NULL) & want) == want) {
1092 ceph_take_cap_refs(ci, want, false);
1095 spin_unlock(&ci->i_ceph_lock);
1097 /* If we didn't get anything, return 0 */
1101 spin_lock(&dentry->d_lock);
1102 di = ceph_dentry(dentry);
1104 * - We are holding Fx, which implies Fs caps.
1105 * - Only support async unlink for primary linkage
1107 if (atomic_read(&ci->i_shared_gen) != di->lease_shared_gen ||
1108 !(di->flags & CEPH_DENTRY_PRIMARY_LINK))
1110 spin_unlock(&dentry->d_lock);
1112 /* Do we still want what we've got? */
1116 ceph_put_cap_refs(ci, got);
1121 * rmdir and unlink are differ only by the metadata op code
1123 static int ceph_unlink(struct inode *dir, struct dentry *dentry)
1125 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
1126 struct ceph_mds_client *mdsc = fsc->mdsc;
1127 struct inode *inode = d_inode(dentry);
1128 struct ceph_mds_request *req;
1129 bool try_async = ceph_test_mount_opt(fsc, ASYNC_DIROPS);
1133 if (ceph_snap(dir) == CEPH_SNAPDIR) {
1134 /* rmdir .snap/foo is RMSNAP */
1135 dout("rmsnap dir %p '%pd' dn %p\n", dir, dentry, dentry);
1136 op = CEPH_MDS_OP_RMSNAP;
1137 } else if (ceph_snap(dir) == CEPH_NOSNAP) {
1138 dout("unlink/rmdir dir %p dn %p inode %p\n",
1139 dir, dentry, inode);
1140 op = d_is_dir(dentry) ?
1141 CEPH_MDS_OP_RMDIR : CEPH_MDS_OP_UNLINK;
1145 req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS);
1150 req->r_dentry = dget(dentry);
1151 req->r_num_caps = 2;
1152 req->r_parent = dir;
1153 req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
1154 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
1155 req->r_inode_drop = ceph_drop_caps_for_unlink(inode);
1157 if (try_async && op == CEPH_MDS_OP_UNLINK &&
1158 (req->r_dir_caps = get_caps_for_async_unlink(dir, dentry))) {
1159 dout("async unlink on %llu/%.*s caps=%s", ceph_ino(dir),
1160 dentry->d_name.len, dentry->d_name.name,
1161 ceph_cap_string(req->r_dir_caps));
1162 set_bit(CEPH_MDS_R_ASYNC, &req->r_req_flags);
1163 req->r_callback = ceph_async_unlink_cb;
1164 req->r_old_inode = d_inode(dentry);
1165 ihold(req->r_old_inode);
1166 err = ceph_mdsc_submit_request(mdsc, dir, req);
1169 * We have enough caps, so we assume that the unlink
1170 * will succeed. Fix up the target inode and dcache.
1174 } else if (err == -EJUKEBOX) {
1176 ceph_mdsc_put_request(req);
1180 set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags);
1181 err = ceph_mdsc_do_request(mdsc, dir, req);
1182 if (!err && !req->r_reply_info.head->is_dentry)
1186 ceph_mdsc_put_request(req);
1191 static int ceph_rename(struct inode *old_dir, struct dentry *old_dentry,
1192 struct inode *new_dir, struct dentry *new_dentry,
1195 struct ceph_fs_client *fsc = ceph_sb_to_client(old_dir->i_sb);
1196 struct ceph_mds_client *mdsc = fsc->mdsc;
1197 struct ceph_mds_request *req;
1198 int op = CEPH_MDS_OP_RENAME;
1204 if (ceph_snap(old_dir) != ceph_snap(new_dir))
1206 if (ceph_snap(old_dir) != CEPH_NOSNAP) {
1207 if (old_dir == new_dir && ceph_snap(old_dir) == CEPH_SNAPDIR)
1208 op = CEPH_MDS_OP_RENAMESNAP;
1211 } else if (old_dir != new_dir) {
1212 err = ceph_quota_check_rename(mdsc, d_inode(old_dentry),
1218 dout("rename dir %p dentry %p to dir %p dentry %p\n",
1219 old_dir, old_dentry, new_dir, new_dentry);
1220 req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS);
1222 return PTR_ERR(req);
1224 req->r_dentry = dget(new_dentry);
1225 req->r_num_caps = 2;
1226 req->r_old_dentry = dget(old_dentry);
1227 req->r_old_dentry_dir = old_dir;
1228 req->r_parent = new_dir;
1229 set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags);
1230 req->r_old_dentry_drop = CEPH_CAP_FILE_SHARED;
1231 req->r_old_dentry_unless = CEPH_CAP_FILE_EXCL;
1232 req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
1233 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
1234 /* release LINK_RDCACHE on source inode (mds will lock it) */
1235 req->r_old_inode_drop = CEPH_CAP_LINK_SHARED | CEPH_CAP_LINK_EXCL;
1236 if (d_really_is_positive(new_dentry)) {
1238 ceph_drop_caps_for_unlink(d_inode(new_dentry));
1240 err = ceph_mdsc_do_request(mdsc, old_dir, req);
1241 if (!err && !req->r_reply_info.head->is_dentry) {
1243 * Normally d_move() is done by fill_trace (called by
1244 * do_request, above). If there is no trace, we need
1247 d_move(old_dentry, new_dentry);
1249 ceph_mdsc_put_request(req);
1254 * Move dentry to tail of mdsc->dentry_leases list when lease is updated.
1255 * Leases at front of the list will expire first. (Assume all leases have
1258 * Called under dentry->d_lock.
1260 void __ceph_dentry_lease_touch(struct ceph_dentry_info *di)
1262 struct dentry *dn = di->dentry;
1263 struct ceph_mds_client *mdsc;
1265 dout("dentry_lease_touch %p %p '%pd'\n", di, dn, dn);
1267 di->flags |= CEPH_DENTRY_LEASE_LIST;
1268 if (di->flags & CEPH_DENTRY_SHRINK_LIST) {
1269 di->flags |= CEPH_DENTRY_REFERENCED;
1273 mdsc = ceph_sb_to_client(dn->d_sb)->mdsc;
1274 spin_lock(&mdsc->dentry_list_lock);
1275 list_move_tail(&di->lease_list, &mdsc->dentry_leases);
1276 spin_unlock(&mdsc->dentry_list_lock);
1279 static void __dentry_dir_lease_touch(struct ceph_mds_client* mdsc,
1280 struct ceph_dentry_info *di)
1282 di->flags &= ~(CEPH_DENTRY_LEASE_LIST | CEPH_DENTRY_REFERENCED);
1285 list_move_tail(&di->lease_list, &mdsc->dentry_dir_leases);
1289 * When dir lease is used, add dentry to tail of mdsc->dentry_dir_leases
1290 * list if it's not in the list, otherwise set 'referenced' flag.
1292 * Called under dentry->d_lock.
1294 void __ceph_dentry_dir_lease_touch(struct ceph_dentry_info *di)
1296 struct dentry *dn = di->dentry;
1297 struct ceph_mds_client *mdsc;
1299 dout("dentry_dir_lease_touch %p %p '%pd' (offset 0x%llx)\n",
1300 di, dn, dn, di->offset);
1302 if (!list_empty(&di->lease_list)) {
1303 if (di->flags & CEPH_DENTRY_LEASE_LIST) {
1304 /* don't remove dentry from dentry lease list
1305 * if its lease is valid */
1306 if (__dentry_lease_is_valid(di))
1309 di->flags |= CEPH_DENTRY_REFERENCED;
1314 if (di->flags & CEPH_DENTRY_SHRINK_LIST) {
1315 di->flags |= CEPH_DENTRY_REFERENCED;
1316 di->flags &= ~CEPH_DENTRY_LEASE_LIST;
1320 mdsc = ceph_sb_to_client(dn->d_sb)->mdsc;
1321 spin_lock(&mdsc->dentry_list_lock);
1322 __dentry_dir_lease_touch(mdsc, di),
1323 spin_unlock(&mdsc->dentry_list_lock);
1326 static void __dentry_lease_unlist(struct ceph_dentry_info *di)
1328 struct ceph_mds_client *mdsc;
1329 if (di->flags & CEPH_DENTRY_SHRINK_LIST)
1331 if (list_empty(&di->lease_list))
1334 mdsc = ceph_sb_to_client(di->dentry->d_sb)->mdsc;
1335 spin_lock(&mdsc->dentry_list_lock);
1336 list_del_init(&di->lease_list);
1337 spin_unlock(&mdsc->dentry_list_lock);
1347 struct ceph_lease_walk_control {
1349 bool expire_dir_lease;
1350 unsigned long nr_to_scan;
1351 unsigned long dir_lease_ttl;
1354 static unsigned long
1355 __dentry_leases_walk(struct ceph_mds_client *mdsc,
1356 struct ceph_lease_walk_control *lwc,
1357 int (*check)(struct dentry*, void*))
1359 struct ceph_dentry_info *di, *tmp;
1360 struct dentry *dentry, *last = NULL;
1361 struct list_head* list;
1363 unsigned long freed = 0;
1366 list = lwc->dir_lease ? &mdsc->dentry_dir_leases : &mdsc->dentry_leases;
1367 spin_lock(&mdsc->dentry_list_lock);
1368 list_for_each_entry_safe(di, tmp, list, lease_list) {
1369 if (!lwc->nr_to_scan)
1373 dentry = di->dentry;
1377 if (!spin_trylock(&dentry->d_lock))
1380 if (__lockref_is_dead(&dentry->d_lockref)) {
1381 list_del_init(&di->lease_list);
1385 ret = check(dentry, lwc);
1387 /* move it into tail of dir lease list */
1388 __dentry_dir_lease_touch(mdsc, di);
1394 di->flags &= ~CEPH_DENTRY_REFERENCED;
1395 if (dentry->d_lockref.count > 0) {
1396 /* update_dentry_lease() will re-add
1397 * it to lease list, or
1398 * ceph_d_delete() will return 1 when
1399 * last reference is dropped */
1400 list_del_init(&di->lease_list);
1402 di->flags |= CEPH_DENTRY_SHRINK_LIST;
1403 list_move_tail(&di->lease_list, &dispose);
1408 spin_unlock(&dentry->d_lock);
1412 spin_unlock(&mdsc->dentry_list_lock);
1414 while (!list_empty(&dispose)) {
1415 di = list_first_entry(&dispose, struct ceph_dentry_info,
1417 dentry = di->dentry;
1418 spin_lock(&dentry->d_lock);
1420 list_del_init(&di->lease_list);
1421 di->flags &= ~CEPH_DENTRY_SHRINK_LIST;
1422 if (di->flags & CEPH_DENTRY_REFERENCED) {
1423 spin_lock(&mdsc->dentry_list_lock);
1424 if (di->flags & CEPH_DENTRY_LEASE_LIST) {
1425 list_add_tail(&di->lease_list,
1426 &mdsc->dentry_leases);
1428 __dentry_dir_lease_touch(mdsc, di);
1430 spin_unlock(&mdsc->dentry_list_lock);
1435 spin_unlock(&dentry->d_lock);
1436 /* ceph_d_delete() does the trick */
1442 static int __dentry_lease_check(struct dentry *dentry, void *arg)
1444 struct ceph_dentry_info *di = ceph_dentry(dentry);
1447 if (__dentry_lease_is_valid(di))
1449 ret = __dir_lease_try_check(dentry);
1457 static int __dir_lease_check(struct dentry *dentry, void *arg)
1459 struct ceph_lease_walk_control *lwc = arg;
1460 struct ceph_dentry_info *di = ceph_dentry(dentry);
1462 int ret = __dir_lease_try_check(dentry);
1466 if (time_before(jiffies, di->time + lwc->dir_lease_ttl))
1468 /* Move dentry to tail of dir lease list if we don't want
1469 * to delete it. So dentries in the list are checked in a
1470 * round robin manner */
1471 if (!lwc->expire_dir_lease)
1473 if (dentry->d_lockref.count > 0 ||
1474 (di->flags & CEPH_DENTRY_REFERENCED))
1476 /* invalidate dir lease */
1477 di->lease_shared_gen = 0;
1482 int ceph_trim_dentries(struct ceph_mds_client *mdsc)
1484 struct ceph_lease_walk_control lwc;
1485 unsigned long count;
1486 unsigned long freed;
1488 spin_lock(&mdsc->caps_list_lock);
1489 if (mdsc->caps_use_max > 0 &&
1490 mdsc->caps_use_count > mdsc->caps_use_max)
1491 count = mdsc->caps_use_count - mdsc->caps_use_max;
1494 spin_unlock(&mdsc->caps_list_lock);
1496 lwc.dir_lease = false;
1497 lwc.nr_to_scan = CEPH_CAPS_PER_RELEASE * 2;
1498 freed = __dentry_leases_walk(mdsc, &lwc, __dentry_lease_check);
1499 if (!lwc.nr_to_scan) /* more invalid leases */
1502 if (lwc.nr_to_scan < CEPH_CAPS_PER_RELEASE)
1503 lwc.nr_to_scan = CEPH_CAPS_PER_RELEASE;
1505 lwc.dir_lease = true;
1506 lwc.expire_dir_lease = freed < count;
1507 lwc.dir_lease_ttl = mdsc->fsc->mount_options->caps_wanted_delay_max * HZ;
1508 freed +=__dentry_leases_walk(mdsc, &lwc, __dir_lease_check);
1509 if (!lwc.nr_to_scan) /* more to check */
1512 return freed > 0 ? 1 : 0;
1516 * Ensure a dentry lease will no longer revalidate.
1518 void ceph_invalidate_dentry_lease(struct dentry *dentry)
1520 struct ceph_dentry_info *di = ceph_dentry(dentry);
1521 spin_lock(&dentry->d_lock);
1523 di->lease_shared_gen = 0;
1524 di->flags &= ~CEPH_DENTRY_PRIMARY_LINK;
1525 __dentry_lease_unlist(di);
1526 spin_unlock(&dentry->d_lock);
1530 * Check if dentry lease is valid. If not, delete the lease. Try to
1531 * renew if the least is more than half up.
1533 static bool __dentry_lease_is_valid(struct ceph_dentry_info *di)
1535 struct ceph_mds_session *session;
1540 session = di->lease_session;
1545 spin_lock(&session->s_gen_ttl_lock);
1546 gen = session->s_cap_gen;
1547 ttl = session->s_cap_ttl;
1548 spin_unlock(&session->s_gen_ttl_lock);
1550 if (di->lease_gen == gen &&
1551 time_before(jiffies, ttl) &&
1552 time_before(jiffies, di->time))
1559 static int dentry_lease_is_valid(struct dentry *dentry, unsigned int flags)
1561 struct ceph_dentry_info *di;
1562 struct ceph_mds_session *session = NULL;
1566 spin_lock(&dentry->d_lock);
1567 di = ceph_dentry(dentry);
1568 if (di && __dentry_lease_is_valid(di)) {
1571 if (di->lease_renew_after &&
1572 time_after(jiffies, di->lease_renew_after)) {
1574 * We should renew. If we're in RCU walk mode
1575 * though, we can't do that so just return
1578 if (flags & LOOKUP_RCU) {
1581 session = ceph_get_mds_session(di->lease_session);
1582 seq = di->lease_seq;
1583 di->lease_renew_after = 0;
1584 di->lease_renew_from = jiffies;
1588 spin_unlock(&dentry->d_lock);
1591 ceph_mdsc_lease_send_msg(session, dentry,
1592 CEPH_MDS_LEASE_RENEW, seq);
1593 ceph_put_mds_session(session);
1595 dout("dentry_lease_is_valid - dentry %p = %d\n", dentry, valid);
1600 * Called under dentry->d_lock.
1602 static int __dir_lease_try_check(const struct dentry *dentry)
1604 struct ceph_dentry_info *di = ceph_dentry(dentry);
1606 struct ceph_inode_info *ci;
1609 if (!di->lease_shared_gen)
1611 if (IS_ROOT(dentry))
1614 dir = d_inode(dentry->d_parent);
1615 ci = ceph_inode(dir);
1617 if (spin_trylock(&ci->i_ceph_lock)) {
1618 if (atomic_read(&ci->i_shared_gen) == di->lease_shared_gen &&
1619 __ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 0))
1621 spin_unlock(&ci->i_ceph_lock);
1627 di->lease_shared_gen = 0;
1632 * Check if directory-wide content lease/cap is valid.
1634 static int dir_lease_is_valid(struct inode *dir, struct dentry *dentry,
1635 struct ceph_mds_client *mdsc)
1637 struct ceph_inode_info *ci = ceph_inode(dir);
1641 spin_lock(&ci->i_ceph_lock);
1642 valid = __ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1);
1644 __ceph_touch_fmode(ci, mdsc, CEPH_FILE_MODE_RD);
1645 shared_gen = atomic_read(&ci->i_shared_gen);
1647 spin_unlock(&ci->i_ceph_lock);
1649 struct ceph_dentry_info *di;
1650 spin_lock(&dentry->d_lock);
1651 di = ceph_dentry(dentry);
1652 if (dir == d_inode(dentry->d_parent) &&
1653 di && di->lease_shared_gen == shared_gen)
1654 __ceph_dentry_dir_lease_touch(di);
1657 spin_unlock(&dentry->d_lock);
1659 dout("dir_lease_is_valid dir %p v%u dentry %p = %d\n",
1660 dir, (unsigned)atomic_read(&ci->i_shared_gen), dentry, valid);
1665 * Check if cached dentry can be trusted.
1667 static int ceph_d_revalidate(struct dentry *dentry, unsigned int flags)
1670 struct dentry *parent;
1671 struct inode *dir, *inode;
1672 struct ceph_mds_client *mdsc;
1674 if (flags & LOOKUP_RCU) {
1675 parent = READ_ONCE(dentry->d_parent);
1676 dir = d_inode_rcu(parent);
1679 inode = d_inode_rcu(dentry);
1681 parent = dget_parent(dentry);
1682 dir = d_inode(parent);
1683 inode = d_inode(dentry);
1686 dout("d_revalidate %p '%pd' inode %p offset 0x%llx\n", dentry,
1687 dentry, inode, ceph_dentry(dentry)->offset);
1689 mdsc = ceph_sb_to_client(dir->i_sb)->mdsc;
1691 /* always trust cached snapped dentries, snapdir dentry */
1692 if (ceph_snap(dir) != CEPH_NOSNAP) {
1693 dout("d_revalidate %p '%pd' inode %p is SNAPPED\n", dentry,
1696 } else if (inode && ceph_snap(inode) == CEPH_SNAPDIR) {
1699 valid = dentry_lease_is_valid(dentry, flags);
1700 if (valid == -ECHILD)
1702 if (valid || dir_lease_is_valid(dir, dentry, mdsc)) {
1704 valid = ceph_is_any_caps(inode);
1711 struct ceph_mds_request *req;
1715 if (flags & LOOKUP_RCU)
1718 percpu_counter_inc(&mdsc->metric.d_lease_mis);
1720 op = ceph_snap(dir) == CEPH_SNAPDIR ?
1721 CEPH_MDS_OP_LOOKUPSNAP : CEPH_MDS_OP_LOOKUP;
1722 req = ceph_mdsc_create_request(mdsc, op, USE_ANY_MDS);
1724 req->r_dentry = dget(dentry);
1725 req->r_num_caps = 2;
1726 req->r_parent = dir;
1728 mask = CEPH_STAT_CAP_INODE | CEPH_CAP_AUTH_SHARED;
1729 if (ceph_security_xattr_wanted(dir))
1730 mask |= CEPH_CAP_XATTR_SHARED;
1731 req->r_args.getattr.mask = cpu_to_le32(mask);
1733 err = ceph_mdsc_do_request(mdsc, NULL, req);
1736 if (d_really_is_positive(dentry) &&
1737 d_inode(dentry) == req->r_target_inode)
1741 if (d_really_is_negative(dentry))
1747 ceph_mdsc_put_request(req);
1748 dout("d_revalidate %p lookup result=%d\n",
1752 percpu_counter_inc(&mdsc->metric.d_lease_hit);
1755 dout("d_revalidate %p %s\n", dentry, valid ? "valid" : "invalid");
1757 ceph_dir_clear_complete(dir);
1759 if (!(flags & LOOKUP_RCU))
1765 * Delete unused dentry that doesn't have valid lease
1767 * Called under dentry->d_lock.
1769 static int ceph_d_delete(const struct dentry *dentry)
1771 struct ceph_dentry_info *di;
1773 /* won't release caps */
1774 if (d_really_is_negative(dentry))
1776 if (ceph_snap(d_inode(dentry)) != CEPH_NOSNAP)
1779 di = ceph_dentry(dentry);
1781 if (__dentry_lease_is_valid(di))
1783 if (__dir_lease_try_check(dentry))
1790 * Release our ceph_dentry_info.
1792 static void ceph_d_release(struct dentry *dentry)
1794 struct ceph_dentry_info *di = ceph_dentry(dentry);
1795 struct ceph_fs_client *fsc = ceph_sb_to_client(dentry->d_sb);
1797 dout("d_release %p\n", dentry);
1799 atomic64_dec(&fsc->mdsc->metric.total_dentries);
1801 spin_lock(&dentry->d_lock);
1802 __dentry_lease_unlist(di);
1803 dentry->d_fsdata = NULL;
1804 spin_unlock(&dentry->d_lock);
1806 if (di->lease_session)
1807 ceph_put_mds_session(di->lease_session);
1808 kmem_cache_free(ceph_dentry_cachep, di);
1812 * When the VFS prunes a dentry from the cache, we need to clear the
1813 * complete flag on the parent directory.
1815 * Called under dentry->d_lock.
1817 static void ceph_d_prune(struct dentry *dentry)
1819 struct ceph_inode_info *dir_ci;
1820 struct ceph_dentry_info *di;
1822 dout("ceph_d_prune %pd %p\n", dentry, dentry);
1824 /* do we have a valid parent? */
1825 if (IS_ROOT(dentry))
1828 /* we hold d_lock, so d_parent is stable */
1829 dir_ci = ceph_inode(d_inode(dentry->d_parent));
1830 if (dir_ci->i_vino.snap == CEPH_SNAPDIR)
1833 /* who calls d_delete() should also disable dcache readdir */
1834 if (d_really_is_negative(dentry))
1837 /* d_fsdata does not get cleared until d_release */
1838 if (!d_unhashed(dentry)) {
1839 __ceph_dir_clear_complete(dir_ci);
1843 /* Disable dcache readdir just in case that someone called d_drop()
1844 * or d_invalidate(), but MDS didn't revoke CEPH_CAP_FILE_SHARED
1845 * properly (dcache readdir is still enabled) */
1846 di = ceph_dentry(dentry);
1847 if (di->offset > 0 &&
1848 di->lease_shared_gen == atomic_read(&dir_ci->i_shared_gen))
1849 __ceph_dir_clear_ordered(dir_ci);
1853 * read() on a dir. This weird interface hack only works if mounted
1854 * with '-o dirstat'.
1856 static ssize_t ceph_read_dir(struct file *file, char __user *buf, size_t size,
1859 struct ceph_dir_file_info *dfi = file->private_data;
1860 struct inode *inode = file_inode(file);
1861 struct ceph_inode_info *ci = ceph_inode(inode);
1863 const int bufsize = 1024;
1865 if (!ceph_test_mount_opt(ceph_sb_to_client(inode->i_sb), DIRSTAT))
1868 if (!dfi->dir_info) {
1869 dfi->dir_info = kmalloc(bufsize, GFP_KERNEL);
1873 snprintf(dfi->dir_info, bufsize,
1876 " subdirs: %20lld\n"
1877 "rentries: %20lld\n"
1879 " rsubdirs: %20lld\n"
1881 "rctime: %10lld.%09ld\n",
1882 ci->i_files + ci->i_subdirs,
1885 ci->i_rfiles + ci->i_rsubdirs,
1889 ci->i_rctime.tv_sec,
1890 ci->i_rctime.tv_nsec);
1893 if (*ppos >= dfi->dir_info_len)
1895 size = min_t(unsigned, size, dfi->dir_info_len-*ppos);
1896 left = copy_to_user(buf, dfi->dir_info + *ppos, size);
1899 *ppos += (size - left);
1906 * Return name hash for a given dentry. This is dependent on
1907 * the parent directory's hash function.
1909 unsigned ceph_dentry_hash(struct inode *dir, struct dentry *dn)
1911 struct ceph_inode_info *dci = ceph_inode(dir);
1914 switch (dci->i_dir_layout.dl_dir_hash) {
1915 case 0: /* for backward compat */
1916 case CEPH_STR_HASH_LINUX:
1917 return dn->d_name.hash;
1920 spin_lock(&dn->d_lock);
1921 hash = ceph_str_hash(dci->i_dir_layout.dl_dir_hash,
1922 dn->d_name.name, dn->d_name.len);
1923 spin_unlock(&dn->d_lock);
1928 const struct file_operations ceph_dir_fops = {
1929 .read = ceph_read_dir,
1930 .iterate = ceph_readdir,
1931 .llseek = ceph_dir_llseek,
1933 .release = ceph_release,
1934 .unlocked_ioctl = ceph_ioctl,
1935 .compat_ioctl = compat_ptr_ioctl,
1936 .fsync = ceph_fsync,
1938 .flock = ceph_flock,
1941 const struct file_operations ceph_snapdir_fops = {
1942 .iterate = ceph_readdir,
1943 .llseek = ceph_dir_llseek,
1945 .release = ceph_release,
1948 const struct inode_operations ceph_dir_iops = {
1949 .lookup = ceph_lookup,
1950 .permission = ceph_permission,
1951 .getattr = ceph_getattr,
1952 .setattr = ceph_setattr,
1953 .listxattr = ceph_listxattr,
1954 .get_acl = ceph_get_acl,
1955 .set_acl = ceph_set_acl,
1956 .mknod = ceph_mknod,
1957 .symlink = ceph_symlink,
1958 .mkdir = ceph_mkdir,
1960 .unlink = ceph_unlink,
1961 .rmdir = ceph_unlink,
1962 .rename = ceph_rename,
1963 .create = ceph_create,
1964 .atomic_open = ceph_atomic_open,
1967 const struct inode_operations ceph_snapdir_iops = {
1968 .lookup = ceph_lookup,
1969 .permission = ceph_permission,
1970 .getattr = ceph_getattr,
1971 .mkdir = ceph_mkdir,
1972 .rmdir = ceph_unlink,
1973 .rename = ceph_rename,
1976 const struct dentry_operations ceph_dentry_ops = {
1977 .d_revalidate = ceph_d_revalidate,
1978 .d_delete = ceph_d_delete,
1979 .d_release = ceph_d_release,
1980 .d_prune = ceph_d_prune,
1981 .d_init = ceph_d_init,