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,
263 ceph_translate_ino(dentry->d_sb,
264 d_inode(dentry)->i_ino),
265 d_inode(dentry)->i_mode >> 12)) {
280 ceph_readdir_cache_release(&cache_ctl);
283 di = ceph_dentry(last);
284 ret = note_last_dentry(dfi, last->d_name.name, last->d_name.len,
285 fpos_off(di->offset) + 1);
289 /* last_name no longer match cache index */
290 if (dfi->readdir_cache_idx >= 0) {
291 dfi->readdir_cache_idx = -1;
292 dfi->dir_release_count = 0;
298 static bool need_send_readdir(struct ceph_dir_file_info *dfi, loff_t pos)
300 if (!dfi->last_readdir)
302 if (is_hash_order(pos))
303 return !ceph_frag_contains_value(dfi->frag, fpos_hash(pos));
305 return dfi->frag != fpos_frag(pos);
308 static int ceph_readdir(struct file *file, struct dir_context *ctx)
310 struct ceph_dir_file_info *dfi = file->private_data;
311 struct inode *inode = file_inode(file);
312 struct ceph_inode_info *ci = ceph_inode(inode);
313 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
314 struct ceph_mds_client *mdsc = fsc->mdsc;
318 struct ceph_mds_reply_info_parsed *rinfo;
320 dout("readdir %p file %p pos %llx\n", inode, file, ctx->pos);
321 if (dfi->file_info.flags & CEPH_F_ATEND)
324 /* always start with . and .. */
326 dout("readdir off 0 -> '.'\n");
327 if (!dir_emit(ctx, ".", 1,
328 ceph_translate_ino(inode->i_sb, inode->i_ino),
329 inode->i_mode >> 12))
334 ino_t ino = parent_ino(file->f_path.dentry);
335 dout("readdir off 1 -> '..'\n");
336 if (!dir_emit(ctx, "..", 2,
337 ceph_translate_ino(inode->i_sb, ino),
338 inode->i_mode >> 12))
343 spin_lock(&ci->i_ceph_lock);
344 /* request Fx cap. if have Fx, we don't need to release Fs cap
345 * for later create/unlink. */
346 __ceph_touch_fmode(ci, mdsc, CEPH_FILE_MODE_WR);
347 /* can we use the dcache? */
348 if (ceph_test_mount_opt(fsc, DCACHE) &&
349 !ceph_test_mount_opt(fsc, NOASYNCREADDIR) &&
350 ceph_snap(inode) != CEPH_SNAPDIR &&
351 __ceph_dir_is_complete_ordered(ci) &&
352 __ceph_caps_issued_mask_metric(ci, CEPH_CAP_FILE_SHARED, 1)) {
353 int shared_gen = atomic_read(&ci->i_shared_gen);
355 spin_unlock(&ci->i_ceph_lock);
356 err = __dcache_readdir(file, ctx, shared_gen);
360 spin_unlock(&ci->i_ceph_lock);
363 /* proceed with a normal readdir */
365 /* do we have the correct frag content buffered? */
366 if (need_send_readdir(dfi, ctx->pos)) {
367 struct ceph_mds_request *req;
368 int op = ceph_snap(inode) == CEPH_SNAPDIR ?
369 CEPH_MDS_OP_LSSNAP : CEPH_MDS_OP_READDIR;
371 /* discard old result, if any */
372 if (dfi->last_readdir) {
373 ceph_mdsc_put_request(dfi->last_readdir);
374 dfi->last_readdir = NULL;
377 if (is_hash_order(ctx->pos)) {
378 /* fragtree isn't always accurate. choose frag
379 * based on previous reply when possible. */
380 if (frag == (unsigned)-1)
381 frag = ceph_choose_frag(ci, fpos_hash(ctx->pos),
384 frag = fpos_frag(ctx->pos);
387 dout("readdir fetching %llx.%llx frag %x offset '%s'\n",
388 ceph_vinop(inode), frag, dfi->last_name);
389 req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS);
392 err = ceph_alloc_readdir_reply_buffer(req, inode);
394 ceph_mdsc_put_request(req);
397 /* hints to request -> mds selection code */
398 req->r_direct_mode = USE_AUTH_MDS;
399 if (op == CEPH_MDS_OP_READDIR) {
400 req->r_direct_hash = ceph_frag_value(frag);
401 __set_bit(CEPH_MDS_R_DIRECT_IS_HASH, &req->r_req_flags);
402 req->r_inode_drop = CEPH_CAP_FILE_EXCL;
404 if (dfi->last_name) {
405 req->r_path2 = kstrdup(dfi->last_name, GFP_KERNEL);
407 ceph_mdsc_put_request(req);
410 } else if (is_hash_order(ctx->pos)) {
411 req->r_args.readdir.offset_hash =
412 cpu_to_le32(fpos_hash(ctx->pos));
415 req->r_dir_release_cnt = dfi->dir_release_count;
416 req->r_dir_ordered_cnt = dfi->dir_ordered_count;
417 req->r_readdir_cache_idx = dfi->readdir_cache_idx;
418 req->r_readdir_offset = dfi->next_offset;
419 req->r_args.readdir.frag = cpu_to_le32(frag);
420 req->r_args.readdir.flags =
421 cpu_to_le16(CEPH_READDIR_REPLY_BITFLAGS);
423 req->r_inode = inode;
425 req->r_dentry = dget(file->f_path.dentry);
426 err = ceph_mdsc_do_request(mdsc, NULL, req);
428 ceph_mdsc_put_request(req);
431 dout("readdir got and parsed readdir result=%d on "
432 "frag %x, end=%d, complete=%d, hash_order=%d\n",
434 (int)req->r_reply_info.dir_end,
435 (int)req->r_reply_info.dir_complete,
436 (int)req->r_reply_info.hash_order);
438 rinfo = &req->r_reply_info;
439 if (le32_to_cpu(rinfo->dir_dir->frag) != frag) {
440 frag = le32_to_cpu(rinfo->dir_dir->frag);
441 if (!rinfo->hash_order) {
442 dfi->next_offset = req->r_readdir_offset;
443 /* adjust ctx->pos to beginning of frag */
444 ctx->pos = ceph_make_fpos(frag,
451 dfi->last_readdir = req;
453 if (test_bit(CEPH_MDS_R_DID_PREPOPULATE, &req->r_req_flags)) {
454 dfi->readdir_cache_idx = req->r_readdir_cache_idx;
455 if (dfi->readdir_cache_idx < 0) {
456 /* preclude from marking dir ordered */
457 dfi->dir_ordered_count = 0;
458 } else if (ceph_frag_is_leftmost(frag) &&
459 dfi->next_offset == 2) {
460 /* note dir version at start of readdir so
461 * we can tell if any dentries get dropped */
462 dfi->dir_release_count = req->r_dir_release_cnt;
463 dfi->dir_ordered_count = req->r_dir_ordered_cnt;
466 dout("readdir !did_prepopulate\n");
467 /* disable readdir cache */
468 dfi->readdir_cache_idx = -1;
469 /* preclude from marking dir complete */
470 dfi->dir_release_count = 0;
473 /* note next offset and last dentry name */
474 if (rinfo->dir_nr > 0) {
475 struct ceph_mds_reply_dir_entry *rde =
476 rinfo->dir_entries + (rinfo->dir_nr-1);
477 unsigned next_offset = req->r_reply_info.dir_end ?
478 2 : (fpos_off(rde->offset) + 1);
479 err = note_last_dentry(dfi, rde->name, rde->name_len,
483 } else if (req->r_reply_info.dir_end) {
484 dfi->next_offset = 2;
489 rinfo = &dfi->last_readdir->r_reply_info;
490 dout("readdir frag %x num %d pos %llx chunk first %llx\n",
491 dfi->frag, rinfo->dir_nr, ctx->pos,
492 rinfo->dir_nr ? rinfo->dir_entries[0].offset : 0LL);
495 /* search start position */
496 if (rinfo->dir_nr > 0) {
497 int step, nr = rinfo->dir_nr;
500 if (rinfo->dir_entries[i + step].offset < ctx->pos) {
508 for (; i < rinfo->dir_nr; i++) {
509 struct ceph_mds_reply_dir_entry *rde = rinfo->dir_entries + i;
510 struct ceph_vino vino;
514 BUG_ON(rde->offset < ctx->pos);
516 ctx->pos = rde->offset;
517 dout("readdir (%d/%d) -> %llx '%.*s' %p\n",
518 i, rinfo->dir_nr, ctx->pos,
519 rde->name_len, rde->name, &rde->inode.in);
521 BUG_ON(!rde->inode.in);
522 ftype = le32_to_cpu(rde->inode.in->mode) >> 12;
523 vino.ino = le64_to_cpu(rde->inode.in->ino);
524 vino.snap = le64_to_cpu(rde->inode.in->snapid);
525 ino = ceph_vino_to_ino(vino);
527 if (!dir_emit(ctx, rde->name, rde->name_len,
528 ceph_translate_ino(inode->i_sb, ino), ftype)) {
529 dout("filldir stopping us...\n");
535 ceph_mdsc_put_request(dfi->last_readdir);
536 dfi->last_readdir = NULL;
538 if (dfi->next_offset > 2) {
544 if (!ceph_frag_is_rightmost(dfi->frag)) {
545 frag = ceph_frag_next(dfi->frag);
546 if (is_hash_order(ctx->pos)) {
547 loff_t new_pos = ceph_make_fpos(ceph_frag_value(frag),
548 dfi->next_offset, true);
549 if (new_pos > ctx->pos)
553 ctx->pos = ceph_make_fpos(frag, dfi->next_offset,
555 kfree(dfi->last_name);
556 dfi->last_name = NULL;
558 dout("readdir next frag is %x\n", frag);
561 dfi->file_info.flags |= CEPH_F_ATEND;
564 * if dir_release_count still matches the dir, no dentries
565 * were released during the whole readdir, and we should have
566 * the complete dir contents in our cache.
568 if (atomic64_read(&ci->i_release_count) ==
569 dfi->dir_release_count) {
570 spin_lock(&ci->i_ceph_lock);
571 if (dfi->dir_ordered_count ==
572 atomic64_read(&ci->i_ordered_count)) {
573 dout(" marking %p complete and ordered\n", inode);
574 /* use i_size to track number of entries in
576 BUG_ON(dfi->readdir_cache_idx < 0);
577 i_size_write(inode, dfi->readdir_cache_idx *
578 sizeof(struct dentry*));
580 dout(" marking %p complete\n", inode);
582 __ceph_dir_set_complete(ci, dfi->dir_release_count,
583 dfi->dir_ordered_count);
584 spin_unlock(&ci->i_ceph_lock);
587 dout("readdir %p file %p done.\n", inode, file);
591 static void reset_readdir(struct ceph_dir_file_info *dfi)
593 if (dfi->last_readdir) {
594 ceph_mdsc_put_request(dfi->last_readdir);
595 dfi->last_readdir = NULL;
597 kfree(dfi->last_name);
598 dfi->last_name = NULL;
599 dfi->dir_release_count = 0;
600 dfi->readdir_cache_idx = -1;
601 dfi->next_offset = 2; /* compensate for . and .. */
602 dfi->file_info.flags &= ~CEPH_F_ATEND;
606 * discard buffered readdir content on seekdir(0), or seek to new frag,
607 * or seek prior to current chunk
609 static bool need_reset_readdir(struct ceph_dir_file_info *dfi, loff_t new_pos)
611 struct ceph_mds_reply_info_parsed *rinfo;
615 if (is_hash_order(new_pos)) {
616 /* no need to reset last_name for a forward seek when
617 * dentries are sotred in hash order */
618 } else if (dfi->frag != fpos_frag(new_pos)) {
621 rinfo = dfi->last_readdir ? &dfi->last_readdir->r_reply_info : NULL;
622 if (!rinfo || !rinfo->dir_nr)
624 chunk_offset = rinfo->dir_entries[0].offset;
625 return new_pos < chunk_offset ||
626 is_hash_order(new_pos) != is_hash_order(chunk_offset);
629 static loff_t ceph_dir_llseek(struct file *file, loff_t offset, int whence)
631 struct ceph_dir_file_info *dfi = file->private_data;
632 struct inode *inode = file->f_mapping->host;
639 offset += file->f_pos;
643 retval = -EOPNOTSUPP;
649 if (need_reset_readdir(dfi, offset)) {
650 dout("dir_llseek dropping %p content\n", file);
652 } else if (is_hash_order(offset) && offset > file->f_pos) {
653 /* for hash offset, we don't know if a forward seek
654 * is within same frag */
655 dfi->dir_release_count = 0;
656 dfi->readdir_cache_idx = -1;
659 if (offset != file->f_pos) {
660 file->f_pos = offset;
662 dfi->file_info.flags &= ~CEPH_F_ATEND;
672 * Handle lookups for the hidden .snap directory.
674 int ceph_handle_snapdir(struct ceph_mds_request *req,
675 struct dentry *dentry, int err)
677 struct ceph_fs_client *fsc = ceph_sb_to_client(dentry->d_sb);
678 struct inode *parent = d_inode(dentry->d_parent); /* we hold i_mutex */
681 if (err == -ENOENT &&
682 ceph_snap(parent) == CEPH_NOSNAP &&
683 strcmp(dentry->d_name.name,
684 fsc->mount_options->snapdir_name) == 0) {
685 struct inode *inode = ceph_get_snapdir(parent);
686 dout("ENOENT on snapdir %p '%pd', linking to snapdir %p\n",
687 dentry, dentry, inode);
688 BUG_ON(!d_unhashed(dentry));
689 d_add(dentry, inode);
696 * Figure out final result of a lookup/open request.
698 * Mainly, make sure we return the final req->r_dentry (if it already
699 * existed) in place of the original VFS-provided dentry when they
702 * Gracefully handle the case where the MDS replies with -ENOENT and
703 * no trace (which it may do, at its discretion, e.g., if it doesn't
704 * care to issue a lease on the negative dentry).
706 struct dentry *ceph_finish_lookup(struct ceph_mds_request *req,
707 struct dentry *dentry, int err)
709 if (err == -ENOENT) {
712 if (!req->r_reply_info.head->is_dentry) {
713 dout("ENOENT and no trace, dentry %p inode %p\n",
714 dentry, d_inode(dentry));
715 if (d_really_is_positive(dentry)) {
724 dentry = ERR_PTR(err);
725 else if (dentry != req->r_dentry)
726 dentry = dget(req->r_dentry); /* we got spliced */
732 static bool is_root_ceph_dentry(struct inode *inode, struct dentry *dentry)
734 return ceph_ino(inode) == CEPH_INO_ROOT &&
735 strncmp(dentry->d_name.name, ".ceph", 5) == 0;
739 * Look up a single dir entry. If there is a lookup intent, inform
740 * the MDS so that it gets our 'caps wanted' value in a single op.
742 static struct dentry *ceph_lookup(struct inode *dir, struct dentry *dentry,
745 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
746 struct ceph_mds_client *mdsc = fsc->mdsc;
747 struct ceph_mds_request *req;
752 dout("lookup %p dentry %p '%pd'\n",
753 dir, dentry, dentry);
755 if (dentry->d_name.len > NAME_MAX)
756 return ERR_PTR(-ENAMETOOLONG);
758 /* can we conclude ENOENT locally? */
759 if (d_really_is_negative(dentry)) {
760 struct ceph_inode_info *ci = ceph_inode(dir);
761 struct ceph_dentry_info *di = ceph_dentry(dentry);
763 spin_lock(&ci->i_ceph_lock);
764 dout(" dir %p flags are 0x%lx\n", dir, ci->i_ceph_flags);
765 if (strncmp(dentry->d_name.name,
766 fsc->mount_options->snapdir_name,
767 dentry->d_name.len) &&
768 !is_root_ceph_dentry(dir, dentry) &&
769 ceph_test_mount_opt(fsc, DCACHE) &&
770 __ceph_dir_is_complete(ci) &&
771 __ceph_caps_issued_mask_metric(ci, CEPH_CAP_FILE_SHARED, 1)) {
772 __ceph_touch_fmode(ci, mdsc, CEPH_FILE_MODE_RD);
773 spin_unlock(&ci->i_ceph_lock);
774 dout(" dir %p complete, -ENOENT\n", dir);
776 di->lease_shared_gen = atomic_read(&ci->i_shared_gen);
779 spin_unlock(&ci->i_ceph_lock);
782 op = ceph_snap(dir) == CEPH_SNAPDIR ?
783 CEPH_MDS_OP_LOOKUPSNAP : CEPH_MDS_OP_LOOKUP;
784 req = ceph_mdsc_create_request(mdsc, op, USE_ANY_MDS);
786 return ERR_CAST(req);
787 req->r_dentry = dget(dentry);
790 mask = CEPH_STAT_CAP_INODE | CEPH_CAP_AUTH_SHARED;
791 if (ceph_security_xattr_wanted(dir))
792 mask |= CEPH_CAP_XATTR_SHARED;
793 req->r_args.getattr.mask = cpu_to_le32(mask);
796 set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags);
797 err = ceph_mdsc_do_request(mdsc, NULL, req);
798 err = ceph_handle_snapdir(req, dentry, err);
799 dentry = ceph_finish_lookup(req, dentry, err);
800 ceph_mdsc_put_request(req); /* will dput(dentry) */
801 dout("lookup result=%p\n", dentry);
806 * If we do a create but get no trace back from the MDS, follow up with
807 * a lookup (the VFS expects us to link up the provided dentry).
809 int ceph_handle_notrace_create(struct inode *dir, struct dentry *dentry)
811 struct dentry *result = ceph_lookup(dir, dentry, 0);
813 if (result && !IS_ERR(result)) {
815 * We created the item, then did a lookup, and found
816 * it was already linked to another inode we already
817 * had in our cache (and thus got spliced). To not
818 * confuse VFS (especially when inode is a directory),
819 * we don't link our dentry to that inode, return an
822 * This event should be rare and it happens only when
823 * we talk to old MDS. Recent MDS does not send traceless
824 * reply for request that creates new inode.
829 return PTR_ERR(result);
832 static int ceph_mknod(struct inode *dir, struct dentry *dentry,
833 umode_t mode, dev_t rdev)
835 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
836 struct ceph_mds_client *mdsc = fsc->mdsc;
837 struct ceph_mds_request *req;
838 struct ceph_acl_sec_ctx as_ctx = {};
841 if (ceph_snap(dir) != CEPH_NOSNAP)
844 if (ceph_quota_is_max_files_exceeded(dir)) {
849 err = ceph_pre_init_acls(dir, &mode, &as_ctx);
852 err = ceph_security_init_secctx(dentry, mode, &as_ctx);
856 dout("mknod in dir %p dentry %p mode 0%ho rdev %d\n",
857 dir, dentry, mode, rdev);
858 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_MKNOD, USE_AUTH_MDS);
863 req->r_dentry = dget(dentry);
866 set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags);
867 req->r_args.mknod.mode = cpu_to_le32(mode);
868 req->r_args.mknod.rdev = cpu_to_le32(rdev);
869 req->r_dentry_drop = CEPH_CAP_FILE_SHARED | CEPH_CAP_AUTH_EXCL;
870 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
871 if (as_ctx.pagelist) {
872 req->r_pagelist = as_ctx.pagelist;
873 as_ctx.pagelist = NULL;
875 err = ceph_mdsc_do_request(mdsc, dir, req);
876 if (!err && !req->r_reply_info.head->is_dentry)
877 err = ceph_handle_notrace_create(dir, dentry);
878 ceph_mdsc_put_request(req);
881 ceph_init_inode_acls(d_inode(dentry), &as_ctx);
884 ceph_release_acl_sec_ctx(&as_ctx);
888 static int ceph_create(struct inode *dir, struct dentry *dentry, umode_t mode,
891 return ceph_mknod(dir, dentry, mode, 0);
894 static int ceph_symlink(struct inode *dir, struct dentry *dentry,
897 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
898 struct ceph_mds_client *mdsc = fsc->mdsc;
899 struct ceph_mds_request *req;
900 struct ceph_acl_sec_ctx as_ctx = {};
903 if (ceph_snap(dir) != CEPH_NOSNAP)
906 if (ceph_quota_is_max_files_exceeded(dir)) {
911 err = ceph_security_init_secctx(dentry, S_IFLNK | 0777, &as_ctx);
915 dout("symlink in dir %p dentry %p to '%s'\n", dir, dentry, dest);
916 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SYMLINK, USE_AUTH_MDS);
921 req->r_path2 = kstrdup(dest, GFP_KERNEL);
924 ceph_mdsc_put_request(req);
928 set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags);
929 req->r_dentry = dget(dentry);
931 req->r_dentry_drop = CEPH_CAP_FILE_SHARED | CEPH_CAP_AUTH_EXCL;
932 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
933 err = ceph_mdsc_do_request(mdsc, dir, req);
934 if (!err && !req->r_reply_info.head->is_dentry)
935 err = ceph_handle_notrace_create(dir, dentry);
936 ceph_mdsc_put_request(req);
940 ceph_release_acl_sec_ctx(&as_ctx);
944 static int ceph_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
946 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
947 struct ceph_mds_client *mdsc = fsc->mdsc;
948 struct ceph_mds_request *req;
949 struct ceph_acl_sec_ctx as_ctx = {};
953 if (ceph_snap(dir) == CEPH_SNAPDIR) {
954 /* mkdir .snap/foo is a MKSNAP */
955 op = CEPH_MDS_OP_MKSNAP;
956 dout("mksnap dir %p snap '%pd' dn %p\n", dir,
958 } else if (ceph_snap(dir) == CEPH_NOSNAP) {
959 dout("mkdir dir %p dn %p mode 0%ho\n", dir, dentry, mode);
960 op = CEPH_MDS_OP_MKDIR;
965 if (op == CEPH_MDS_OP_MKDIR &&
966 ceph_quota_is_max_files_exceeded(dir)) {
972 err = ceph_pre_init_acls(dir, &mode, &as_ctx);
975 err = ceph_security_init_secctx(dentry, mode, &as_ctx);
979 req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS);
985 req->r_dentry = dget(dentry);
988 set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags);
989 req->r_args.mkdir.mode = cpu_to_le32(mode);
990 req->r_dentry_drop = CEPH_CAP_FILE_SHARED | CEPH_CAP_AUTH_EXCL;
991 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
992 if (as_ctx.pagelist) {
993 req->r_pagelist = as_ctx.pagelist;
994 as_ctx.pagelist = NULL;
996 err = ceph_mdsc_do_request(mdsc, dir, req);
998 !req->r_reply_info.head->is_target &&
999 !req->r_reply_info.head->is_dentry)
1000 err = ceph_handle_notrace_create(dir, dentry);
1001 ceph_mdsc_put_request(req);
1004 ceph_init_inode_acls(d_inode(dentry), &as_ctx);
1007 ceph_release_acl_sec_ctx(&as_ctx);
1011 static int ceph_link(struct dentry *old_dentry, struct inode *dir,
1012 struct dentry *dentry)
1014 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
1015 struct ceph_mds_client *mdsc = fsc->mdsc;
1016 struct ceph_mds_request *req;
1019 if (ceph_snap(dir) != CEPH_NOSNAP)
1022 dout("link in dir %p old_dentry %p dentry %p\n", dir,
1023 old_dentry, dentry);
1024 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_LINK, USE_AUTH_MDS);
1027 return PTR_ERR(req);
1029 req->r_dentry = dget(dentry);
1030 req->r_num_caps = 2;
1031 req->r_old_dentry = dget(old_dentry);
1032 req->r_parent = dir;
1033 set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags);
1034 req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
1035 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
1036 /* release LINK_SHARED on source inode (mds will lock it) */
1037 req->r_old_inode_drop = CEPH_CAP_LINK_SHARED | CEPH_CAP_LINK_EXCL;
1038 err = ceph_mdsc_do_request(mdsc, dir, req);
1041 } else if (!req->r_reply_info.head->is_dentry) {
1042 ihold(d_inode(old_dentry));
1043 d_instantiate(dentry, d_inode(old_dentry));
1045 ceph_mdsc_put_request(req);
1049 static void ceph_async_unlink_cb(struct ceph_mds_client *mdsc,
1050 struct ceph_mds_request *req)
1052 int result = req->r_err ? req->r_err :
1053 le32_to_cpu(req->r_reply_info.head->result);
1055 if (result == -EJUKEBOX)
1058 /* If op failed, mark everyone involved for errors */
1062 char *path = ceph_mdsc_build_path(req->r_dentry, &pathlen,
1065 /* mark error on parent + clear complete */
1066 mapping_set_error(req->r_parent->i_mapping, result);
1067 ceph_dir_clear_complete(req->r_parent);
1069 /* drop the dentry -- we don't know its status */
1070 if (!d_unhashed(req->r_dentry))
1071 d_drop(req->r_dentry);
1073 /* mark inode itself for an error (since metadata is bogus) */
1074 mapping_set_error(req->r_old_inode->i_mapping, result);
1076 pr_warn("ceph: async unlink failure path=(%llx)%s result=%d!\n",
1077 base, IS_ERR(path) ? "<<bad>>" : path, result);
1078 ceph_mdsc_free_path(path, pathlen);
1081 iput(req->r_old_inode);
1082 ceph_mdsc_release_dir_caps(req);
1085 static int get_caps_for_async_unlink(struct inode *dir, struct dentry *dentry)
1087 struct ceph_inode_info *ci = ceph_inode(dir);
1088 struct ceph_dentry_info *di;
1089 int got = 0, want = CEPH_CAP_FILE_EXCL | CEPH_CAP_DIR_UNLINK;
1091 spin_lock(&ci->i_ceph_lock);
1092 if ((__ceph_caps_issued(ci, NULL) & want) == want) {
1093 ceph_take_cap_refs(ci, want, false);
1096 spin_unlock(&ci->i_ceph_lock);
1098 /* If we didn't get anything, return 0 */
1102 spin_lock(&dentry->d_lock);
1103 di = ceph_dentry(dentry);
1105 * - We are holding Fx, which implies Fs caps.
1106 * - Only support async unlink for primary linkage
1108 if (atomic_read(&ci->i_shared_gen) != di->lease_shared_gen ||
1109 !(di->flags & CEPH_DENTRY_PRIMARY_LINK))
1111 spin_unlock(&dentry->d_lock);
1113 /* Do we still want what we've got? */
1117 ceph_put_cap_refs(ci, got);
1122 * rmdir and unlink are differ only by the metadata op code
1124 static int ceph_unlink(struct inode *dir, struct dentry *dentry)
1126 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
1127 struct ceph_mds_client *mdsc = fsc->mdsc;
1128 struct inode *inode = d_inode(dentry);
1129 struct ceph_mds_request *req;
1130 bool try_async = ceph_test_mount_opt(fsc, ASYNC_DIROPS);
1134 if (ceph_snap(dir) == CEPH_SNAPDIR) {
1135 /* rmdir .snap/foo is RMSNAP */
1136 dout("rmsnap dir %p '%pd' dn %p\n", dir, dentry, dentry);
1137 op = CEPH_MDS_OP_RMSNAP;
1138 } else if (ceph_snap(dir) == CEPH_NOSNAP) {
1139 dout("unlink/rmdir dir %p dn %p inode %p\n",
1140 dir, dentry, inode);
1141 op = d_is_dir(dentry) ?
1142 CEPH_MDS_OP_RMDIR : CEPH_MDS_OP_UNLINK;
1146 req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS);
1151 req->r_dentry = dget(dentry);
1152 req->r_num_caps = 2;
1153 req->r_parent = dir;
1154 req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
1155 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
1156 req->r_inode_drop = ceph_drop_caps_for_unlink(inode);
1158 if (try_async && op == CEPH_MDS_OP_UNLINK &&
1159 (req->r_dir_caps = get_caps_for_async_unlink(dir, dentry))) {
1160 dout("async unlink on %lu/%.*s caps=%s", dir->i_ino,
1161 dentry->d_name.len, dentry->d_name.name,
1162 ceph_cap_string(req->r_dir_caps));
1163 set_bit(CEPH_MDS_R_ASYNC, &req->r_req_flags);
1164 req->r_callback = ceph_async_unlink_cb;
1165 req->r_old_inode = d_inode(dentry);
1166 ihold(req->r_old_inode);
1167 err = ceph_mdsc_submit_request(mdsc, dir, req);
1170 * We have enough caps, so we assume that the unlink
1171 * will succeed. Fix up the target inode and dcache.
1175 } else if (err == -EJUKEBOX) {
1177 ceph_mdsc_put_request(req);
1181 set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags);
1182 err = ceph_mdsc_do_request(mdsc, dir, req);
1183 if (!err && !req->r_reply_info.head->is_dentry)
1187 ceph_mdsc_put_request(req);
1192 static int ceph_rename(struct inode *old_dir, struct dentry *old_dentry,
1193 struct inode *new_dir, struct dentry *new_dentry,
1196 struct ceph_fs_client *fsc = ceph_sb_to_client(old_dir->i_sb);
1197 struct ceph_mds_client *mdsc = fsc->mdsc;
1198 struct ceph_mds_request *req;
1199 int op = CEPH_MDS_OP_RENAME;
1205 if (ceph_snap(old_dir) != ceph_snap(new_dir))
1207 if (ceph_snap(old_dir) != CEPH_NOSNAP) {
1208 if (old_dir == new_dir && ceph_snap(old_dir) == CEPH_SNAPDIR)
1209 op = CEPH_MDS_OP_RENAMESNAP;
1212 } else if (old_dir != new_dir) {
1213 err = ceph_quota_check_rename(mdsc, d_inode(old_dentry),
1219 dout("rename dir %p dentry %p to dir %p dentry %p\n",
1220 old_dir, old_dentry, new_dir, new_dentry);
1221 req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS);
1223 return PTR_ERR(req);
1225 req->r_dentry = dget(new_dentry);
1226 req->r_num_caps = 2;
1227 req->r_old_dentry = dget(old_dentry);
1228 req->r_old_dentry_dir = old_dir;
1229 req->r_parent = new_dir;
1230 set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags);
1231 req->r_old_dentry_drop = CEPH_CAP_FILE_SHARED;
1232 req->r_old_dentry_unless = CEPH_CAP_FILE_EXCL;
1233 req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
1234 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
1235 /* release LINK_RDCACHE on source inode (mds will lock it) */
1236 req->r_old_inode_drop = CEPH_CAP_LINK_SHARED | CEPH_CAP_LINK_EXCL;
1237 if (d_really_is_positive(new_dentry)) {
1239 ceph_drop_caps_for_unlink(d_inode(new_dentry));
1241 err = ceph_mdsc_do_request(mdsc, old_dir, req);
1242 if (!err && !req->r_reply_info.head->is_dentry) {
1244 * Normally d_move() is done by fill_trace (called by
1245 * do_request, above). If there is no trace, we need
1248 d_move(old_dentry, new_dentry);
1250 ceph_mdsc_put_request(req);
1255 * Move dentry to tail of mdsc->dentry_leases list when lease is updated.
1256 * Leases at front of the list will expire first. (Assume all leases have
1259 * Called under dentry->d_lock.
1261 void __ceph_dentry_lease_touch(struct ceph_dentry_info *di)
1263 struct dentry *dn = di->dentry;
1264 struct ceph_mds_client *mdsc;
1266 dout("dentry_lease_touch %p %p '%pd'\n", di, dn, dn);
1268 di->flags |= CEPH_DENTRY_LEASE_LIST;
1269 if (di->flags & CEPH_DENTRY_SHRINK_LIST) {
1270 di->flags |= CEPH_DENTRY_REFERENCED;
1274 mdsc = ceph_sb_to_client(dn->d_sb)->mdsc;
1275 spin_lock(&mdsc->dentry_list_lock);
1276 list_move_tail(&di->lease_list, &mdsc->dentry_leases);
1277 spin_unlock(&mdsc->dentry_list_lock);
1280 static void __dentry_dir_lease_touch(struct ceph_mds_client* mdsc,
1281 struct ceph_dentry_info *di)
1283 di->flags &= ~(CEPH_DENTRY_LEASE_LIST | CEPH_DENTRY_REFERENCED);
1286 list_move_tail(&di->lease_list, &mdsc->dentry_dir_leases);
1290 * When dir lease is used, add dentry to tail of mdsc->dentry_dir_leases
1291 * list if it's not in the list, otherwise set 'referenced' flag.
1293 * Called under dentry->d_lock.
1295 void __ceph_dentry_dir_lease_touch(struct ceph_dentry_info *di)
1297 struct dentry *dn = di->dentry;
1298 struct ceph_mds_client *mdsc;
1300 dout("dentry_dir_lease_touch %p %p '%pd' (offset 0x%llx)\n",
1301 di, dn, dn, di->offset);
1303 if (!list_empty(&di->lease_list)) {
1304 if (di->flags & CEPH_DENTRY_LEASE_LIST) {
1305 /* don't remove dentry from dentry lease list
1306 * if its lease is valid */
1307 if (__dentry_lease_is_valid(di))
1310 di->flags |= CEPH_DENTRY_REFERENCED;
1315 if (di->flags & CEPH_DENTRY_SHRINK_LIST) {
1316 di->flags |= CEPH_DENTRY_REFERENCED;
1317 di->flags &= ~CEPH_DENTRY_LEASE_LIST;
1321 mdsc = ceph_sb_to_client(dn->d_sb)->mdsc;
1322 spin_lock(&mdsc->dentry_list_lock);
1323 __dentry_dir_lease_touch(mdsc, di),
1324 spin_unlock(&mdsc->dentry_list_lock);
1327 static void __dentry_lease_unlist(struct ceph_dentry_info *di)
1329 struct ceph_mds_client *mdsc;
1330 if (di->flags & CEPH_DENTRY_SHRINK_LIST)
1332 if (list_empty(&di->lease_list))
1335 mdsc = ceph_sb_to_client(di->dentry->d_sb)->mdsc;
1336 spin_lock(&mdsc->dentry_list_lock);
1337 list_del_init(&di->lease_list);
1338 spin_unlock(&mdsc->dentry_list_lock);
1348 struct ceph_lease_walk_control {
1350 bool expire_dir_lease;
1351 unsigned long nr_to_scan;
1352 unsigned long dir_lease_ttl;
1355 static unsigned long
1356 __dentry_leases_walk(struct ceph_mds_client *mdsc,
1357 struct ceph_lease_walk_control *lwc,
1358 int (*check)(struct dentry*, void*))
1360 struct ceph_dentry_info *di, *tmp;
1361 struct dentry *dentry, *last = NULL;
1362 struct list_head* list;
1364 unsigned long freed = 0;
1367 list = lwc->dir_lease ? &mdsc->dentry_dir_leases : &mdsc->dentry_leases;
1368 spin_lock(&mdsc->dentry_list_lock);
1369 list_for_each_entry_safe(di, tmp, list, lease_list) {
1370 if (!lwc->nr_to_scan)
1374 dentry = di->dentry;
1378 if (!spin_trylock(&dentry->d_lock))
1381 if (__lockref_is_dead(&dentry->d_lockref)) {
1382 list_del_init(&di->lease_list);
1386 ret = check(dentry, lwc);
1388 /* move it into tail of dir lease list */
1389 __dentry_dir_lease_touch(mdsc, di);
1395 di->flags &= ~CEPH_DENTRY_REFERENCED;
1396 if (dentry->d_lockref.count > 0) {
1397 /* update_dentry_lease() will re-add
1398 * it to lease list, or
1399 * ceph_d_delete() will return 1 when
1400 * last reference is dropped */
1401 list_del_init(&di->lease_list);
1403 di->flags |= CEPH_DENTRY_SHRINK_LIST;
1404 list_move_tail(&di->lease_list, &dispose);
1409 spin_unlock(&dentry->d_lock);
1413 spin_unlock(&mdsc->dentry_list_lock);
1415 while (!list_empty(&dispose)) {
1416 di = list_first_entry(&dispose, struct ceph_dentry_info,
1418 dentry = di->dentry;
1419 spin_lock(&dentry->d_lock);
1421 list_del_init(&di->lease_list);
1422 di->flags &= ~CEPH_DENTRY_SHRINK_LIST;
1423 if (di->flags & CEPH_DENTRY_REFERENCED) {
1424 spin_lock(&mdsc->dentry_list_lock);
1425 if (di->flags & CEPH_DENTRY_LEASE_LIST) {
1426 list_add_tail(&di->lease_list,
1427 &mdsc->dentry_leases);
1429 __dentry_dir_lease_touch(mdsc, di);
1431 spin_unlock(&mdsc->dentry_list_lock);
1436 spin_unlock(&dentry->d_lock);
1437 /* ceph_d_delete() does the trick */
1443 static int __dentry_lease_check(struct dentry *dentry, void *arg)
1445 struct ceph_dentry_info *di = ceph_dentry(dentry);
1448 if (__dentry_lease_is_valid(di))
1450 ret = __dir_lease_try_check(dentry);
1458 static int __dir_lease_check(struct dentry *dentry, void *arg)
1460 struct ceph_lease_walk_control *lwc = arg;
1461 struct ceph_dentry_info *di = ceph_dentry(dentry);
1463 int ret = __dir_lease_try_check(dentry);
1467 if (time_before(jiffies, di->time + lwc->dir_lease_ttl))
1469 /* Move dentry to tail of dir lease list if we don't want
1470 * to delete it. So dentries in the list are checked in a
1471 * round robin manner */
1472 if (!lwc->expire_dir_lease)
1474 if (dentry->d_lockref.count > 0 ||
1475 (di->flags & CEPH_DENTRY_REFERENCED))
1477 /* invalidate dir lease */
1478 di->lease_shared_gen = 0;
1483 int ceph_trim_dentries(struct ceph_mds_client *mdsc)
1485 struct ceph_lease_walk_control lwc;
1486 unsigned long count;
1487 unsigned long freed;
1489 spin_lock(&mdsc->caps_list_lock);
1490 if (mdsc->caps_use_max > 0 &&
1491 mdsc->caps_use_count > mdsc->caps_use_max)
1492 count = mdsc->caps_use_count - mdsc->caps_use_max;
1495 spin_unlock(&mdsc->caps_list_lock);
1497 lwc.dir_lease = false;
1498 lwc.nr_to_scan = CEPH_CAPS_PER_RELEASE * 2;
1499 freed = __dentry_leases_walk(mdsc, &lwc, __dentry_lease_check);
1500 if (!lwc.nr_to_scan) /* more invalid leases */
1503 if (lwc.nr_to_scan < CEPH_CAPS_PER_RELEASE)
1504 lwc.nr_to_scan = CEPH_CAPS_PER_RELEASE;
1506 lwc.dir_lease = true;
1507 lwc.expire_dir_lease = freed < count;
1508 lwc.dir_lease_ttl = mdsc->fsc->mount_options->caps_wanted_delay_max * HZ;
1509 freed +=__dentry_leases_walk(mdsc, &lwc, __dir_lease_check);
1510 if (!lwc.nr_to_scan) /* more to check */
1513 return freed > 0 ? 1 : 0;
1517 * Ensure a dentry lease will no longer revalidate.
1519 void ceph_invalidate_dentry_lease(struct dentry *dentry)
1521 struct ceph_dentry_info *di = ceph_dentry(dentry);
1522 spin_lock(&dentry->d_lock);
1524 di->lease_shared_gen = 0;
1525 di->flags &= ~CEPH_DENTRY_PRIMARY_LINK;
1526 __dentry_lease_unlist(di);
1527 spin_unlock(&dentry->d_lock);
1531 * Check if dentry lease is valid. If not, delete the lease. Try to
1532 * renew if the least is more than half up.
1534 static bool __dentry_lease_is_valid(struct ceph_dentry_info *di)
1536 struct ceph_mds_session *session;
1541 session = di->lease_session;
1546 spin_lock(&session->s_gen_ttl_lock);
1547 gen = session->s_cap_gen;
1548 ttl = session->s_cap_ttl;
1549 spin_unlock(&session->s_gen_ttl_lock);
1551 if (di->lease_gen == gen &&
1552 time_before(jiffies, ttl) &&
1553 time_before(jiffies, di->time))
1560 static int dentry_lease_is_valid(struct dentry *dentry, unsigned int flags)
1562 struct ceph_dentry_info *di;
1563 struct ceph_mds_session *session = NULL;
1567 spin_lock(&dentry->d_lock);
1568 di = ceph_dentry(dentry);
1569 if (di && __dentry_lease_is_valid(di)) {
1572 if (di->lease_renew_after &&
1573 time_after(jiffies, di->lease_renew_after)) {
1575 * We should renew. If we're in RCU walk mode
1576 * though, we can't do that so just return
1579 if (flags & LOOKUP_RCU) {
1582 session = ceph_get_mds_session(di->lease_session);
1583 seq = di->lease_seq;
1584 di->lease_renew_after = 0;
1585 di->lease_renew_from = jiffies;
1589 spin_unlock(&dentry->d_lock);
1592 ceph_mdsc_lease_send_msg(session, dentry,
1593 CEPH_MDS_LEASE_RENEW, seq);
1594 ceph_put_mds_session(session);
1596 dout("dentry_lease_is_valid - dentry %p = %d\n", dentry, valid);
1601 * Called under dentry->d_lock.
1603 static int __dir_lease_try_check(const struct dentry *dentry)
1605 struct ceph_dentry_info *di = ceph_dentry(dentry);
1607 struct ceph_inode_info *ci;
1610 if (!di->lease_shared_gen)
1612 if (IS_ROOT(dentry))
1615 dir = d_inode(dentry->d_parent);
1616 ci = ceph_inode(dir);
1618 if (spin_trylock(&ci->i_ceph_lock)) {
1619 if (atomic_read(&ci->i_shared_gen) == di->lease_shared_gen &&
1620 __ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 0))
1622 spin_unlock(&ci->i_ceph_lock);
1628 di->lease_shared_gen = 0;
1633 * Check if directory-wide content lease/cap is valid.
1635 static int dir_lease_is_valid(struct inode *dir, struct dentry *dentry,
1636 struct ceph_mds_client *mdsc)
1638 struct ceph_inode_info *ci = ceph_inode(dir);
1642 spin_lock(&ci->i_ceph_lock);
1643 valid = __ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1);
1645 __ceph_touch_fmode(ci, mdsc, CEPH_FILE_MODE_RD);
1646 shared_gen = atomic_read(&ci->i_shared_gen);
1648 spin_unlock(&ci->i_ceph_lock);
1650 struct ceph_dentry_info *di;
1651 spin_lock(&dentry->d_lock);
1652 di = ceph_dentry(dentry);
1653 if (dir == d_inode(dentry->d_parent) &&
1654 di && di->lease_shared_gen == shared_gen)
1655 __ceph_dentry_dir_lease_touch(di);
1658 spin_unlock(&dentry->d_lock);
1660 dout("dir_lease_is_valid dir %p v%u dentry %p = %d\n",
1661 dir, (unsigned)atomic_read(&ci->i_shared_gen), dentry, valid);
1666 * Check if cached dentry can be trusted.
1668 static int ceph_d_revalidate(struct dentry *dentry, unsigned int flags)
1671 struct dentry *parent;
1672 struct inode *dir, *inode;
1673 struct ceph_mds_client *mdsc;
1675 if (flags & LOOKUP_RCU) {
1676 parent = READ_ONCE(dentry->d_parent);
1677 dir = d_inode_rcu(parent);
1680 inode = d_inode_rcu(dentry);
1682 parent = dget_parent(dentry);
1683 dir = d_inode(parent);
1684 inode = d_inode(dentry);
1687 dout("d_revalidate %p '%pd' inode %p offset 0x%llx\n", dentry,
1688 dentry, inode, ceph_dentry(dentry)->offset);
1690 mdsc = ceph_sb_to_client(dir->i_sb)->mdsc;
1692 /* always trust cached snapped dentries, snapdir dentry */
1693 if (ceph_snap(dir) != CEPH_NOSNAP) {
1694 dout("d_revalidate %p '%pd' inode %p is SNAPPED\n", dentry,
1697 } else if (inode && ceph_snap(inode) == CEPH_SNAPDIR) {
1700 valid = dentry_lease_is_valid(dentry, flags);
1701 if (valid == -ECHILD)
1703 if (valid || dir_lease_is_valid(dir, dentry, mdsc)) {
1705 valid = ceph_is_any_caps(inode);
1712 struct ceph_mds_request *req;
1716 if (flags & LOOKUP_RCU)
1719 percpu_counter_inc(&mdsc->metric.d_lease_mis);
1721 op = ceph_snap(dir) == CEPH_SNAPDIR ?
1722 CEPH_MDS_OP_LOOKUPSNAP : CEPH_MDS_OP_LOOKUP;
1723 req = ceph_mdsc_create_request(mdsc, op, USE_ANY_MDS);
1725 req->r_dentry = dget(dentry);
1726 req->r_num_caps = 2;
1727 req->r_parent = dir;
1729 mask = CEPH_STAT_CAP_INODE | CEPH_CAP_AUTH_SHARED;
1730 if (ceph_security_xattr_wanted(dir))
1731 mask |= CEPH_CAP_XATTR_SHARED;
1732 req->r_args.getattr.mask = cpu_to_le32(mask);
1734 err = ceph_mdsc_do_request(mdsc, NULL, req);
1737 if (d_really_is_positive(dentry) &&
1738 d_inode(dentry) == req->r_target_inode)
1742 if (d_really_is_negative(dentry))
1748 ceph_mdsc_put_request(req);
1749 dout("d_revalidate %p lookup result=%d\n",
1753 percpu_counter_inc(&mdsc->metric.d_lease_hit);
1756 dout("d_revalidate %p %s\n", dentry, valid ? "valid" : "invalid");
1758 ceph_dir_clear_complete(dir);
1760 if (!(flags & LOOKUP_RCU))
1766 * Delete unused dentry that doesn't have valid lease
1768 * Called under dentry->d_lock.
1770 static int ceph_d_delete(const struct dentry *dentry)
1772 struct ceph_dentry_info *di;
1774 /* won't release caps */
1775 if (d_really_is_negative(dentry))
1777 if (ceph_snap(d_inode(dentry)) != CEPH_NOSNAP)
1780 di = ceph_dentry(dentry);
1782 if (__dentry_lease_is_valid(di))
1784 if (__dir_lease_try_check(dentry))
1791 * Release our ceph_dentry_info.
1793 static void ceph_d_release(struct dentry *dentry)
1795 struct ceph_dentry_info *di = ceph_dentry(dentry);
1796 struct ceph_fs_client *fsc = ceph_sb_to_client(dentry->d_sb);
1798 dout("d_release %p\n", dentry);
1800 atomic64_dec(&fsc->mdsc->metric.total_dentries);
1802 spin_lock(&dentry->d_lock);
1803 __dentry_lease_unlist(di);
1804 dentry->d_fsdata = NULL;
1805 spin_unlock(&dentry->d_lock);
1807 if (di->lease_session)
1808 ceph_put_mds_session(di->lease_session);
1809 kmem_cache_free(ceph_dentry_cachep, di);
1813 * When the VFS prunes a dentry from the cache, we need to clear the
1814 * complete flag on the parent directory.
1816 * Called under dentry->d_lock.
1818 static void ceph_d_prune(struct dentry *dentry)
1820 struct ceph_inode_info *dir_ci;
1821 struct ceph_dentry_info *di;
1823 dout("ceph_d_prune %pd %p\n", dentry, dentry);
1825 /* do we have a valid parent? */
1826 if (IS_ROOT(dentry))
1829 /* we hold d_lock, so d_parent is stable */
1830 dir_ci = ceph_inode(d_inode(dentry->d_parent));
1831 if (dir_ci->i_vino.snap == CEPH_SNAPDIR)
1834 /* who calls d_delete() should also disable dcache readdir */
1835 if (d_really_is_negative(dentry))
1838 /* d_fsdata does not get cleared until d_release */
1839 if (!d_unhashed(dentry)) {
1840 __ceph_dir_clear_complete(dir_ci);
1844 /* Disable dcache readdir just in case that someone called d_drop()
1845 * or d_invalidate(), but MDS didn't revoke CEPH_CAP_FILE_SHARED
1846 * properly (dcache readdir is still enabled) */
1847 di = ceph_dentry(dentry);
1848 if (di->offset > 0 &&
1849 di->lease_shared_gen == atomic_read(&dir_ci->i_shared_gen))
1850 __ceph_dir_clear_ordered(dir_ci);
1854 * read() on a dir. This weird interface hack only works if mounted
1855 * with '-o dirstat'.
1857 static ssize_t ceph_read_dir(struct file *file, char __user *buf, size_t size,
1860 struct ceph_dir_file_info *dfi = file->private_data;
1861 struct inode *inode = file_inode(file);
1862 struct ceph_inode_info *ci = ceph_inode(inode);
1864 const int bufsize = 1024;
1866 if (!ceph_test_mount_opt(ceph_sb_to_client(inode->i_sb), DIRSTAT))
1869 if (!dfi->dir_info) {
1870 dfi->dir_info = kmalloc(bufsize, GFP_KERNEL);
1874 snprintf(dfi->dir_info, bufsize,
1877 " subdirs: %20lld\n"
1878 "rentries: %20lld\n"
1880 " rsubdirs: %20lld\n"
1882 "rctime: %10lld.%09ld\n",
1883 ci->i_files + ci->i_subdirs,
1886 ci->i_rfiles + ci->i_rsubdirs,
1890 ci->i_rctime.tv_sec,
1891 ci->i_rctime.tv_nsec);
1894 if (*ppos >= dfi->dir_info_len)
1896 size = min_t(unsigned, size, dfi->dir_info_len-*ppos);
1897 left = copy_to_user(buf, dfi->dir_info + *ppos, size);
1900 *ppos += (size - left);
1907 * Return name hash for a given dentry. This is dependent on
1908 * the parent directory's hash function.
1910 unsigned ceph_dentry_hash(struct inode *dir, struct dentry *dn)
1912 struct ceph_inode_info *dci = ceph_inode(dir);
1915 switch (dci->i_dir_layout.dl_dir_hash) {
1916 case 0: /* for backward compat */
1917 case CEPH_STR_HASH_LINUX:
1918 return dn->d_name.hash;
1921 spin_lock(&dn->d_lock);
1922 hash = ceph_str_hash(dci->i_dir_layout.dl_dir_hash,
1923 dn->d_name.name, dn->d_name.len);
1924 spin_unlock(&dn->d_lock);
1929 const struct file_operations ceph_dir_fops = {
1930 .read = ceph_read_dir,
1931 .iterate = ceph_readdir,
1932 .llseek = ceph_dir_llseek,
1934 .release = ceph_release,
1935 .unlocked_ioctl = ceph_ioctl,
1936 .compat_ioctl = compat_ptr_ioctl,
1937 .fsync = ceph_fsync,
1939 .flock = ceph_flock,
1942 const struct file_operations ceph_snapdir_fops = {
1943 .iterate = ceph_readdir,
1944 .llseek = ceph_dir_llseek,
1946 .release = ceph_release,
1949 const struct inode_operations ceph_dir_iops = {
1950 .lookup = ceph_lookup,
1951 .permission = ceph_permission,
1952 .getattr = ceph_getattr,
1953 .setattr = ceph_setattr,
1954 .listxattr = ceph_listxattr,
1955 .get_acl = ceph_get_acl,
1956 .set_acl = ceph_set_acl,
1957 .mknod = ceph_mknod,
1958 .symlink = ceph_symlink,
1959 .mkdir = ceph_mkdir,
1961 .unlink = ceph_unlink,
1962 .rmdir = ceph_unlink,
1963 .rename = ceph_rename,
1964 .create = ceph_create,
1965 .atomic_open = ceph_atomic_open,
1968 const struct inode_operations ceph_snapdir_iops = {
1969 .lookup = ceph_lookup,
1970 .permission = ceph_permission,
1971 .getattr = ceph_getattr,
1972 .mkdir = ceph_mkdir,
1973 .rmdir = ceph_unlink,
1974 .rename = ceph_rename,
1977 const struct dentry_operations ceph_dentry_ops = {
1978 .d_revalidate = ceph_d_revalidate,
1979 .d_delete = ceph_d_delete,
1980 .d_release = ceph_d_release,
1981 .d_prune = ceph_d_prune,
1982 .d_init = ceph_d_init,