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 if (as_ctx.pagelist) {
934 req->r_pagelist = as_ctx.pagelist;
935 as_ctx.pagelist = NULL;
937 err = ceph_mdsc_do_request(mdsc, dir, req);
938 if (!err && !req->r_reply_info.head->is_dentry)
939 err = ceph_handle_notrace_create(dir, dentry);
940 ceph_mdsc_put_request(req);
944 ceph_release_acl_sec_ctx(&as_ctx);
948 static int ceph_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
950 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
951 struct ceph_mds_client *mdsc = fsc->mdsc;
952 struct ceph_mds_request *req;
953 struct ceph_acl_sec_ctx as_ctx = {};
957 if (ceph_snap(dir) == CEPH_SNAPDIR) {
958 /* mkdir .snap/foo is a MKSNAP */
959 op = CEPH_MDS_OP_MKSNAP;
960 dout("mksnap dir %p snap '%pd' dn %p\n", dir,
962 } else if (ceph_snap(dir) == CEPH_NOSNAP) {
963 dout("mkdir dir %p dn %p mode 0%ho\n", dir, dentry, mode);
964 op = CEPH_MDS_OP_MKDIR;
969 if (op == CEPH_MDS_OP_MKDIR &&
970 ceph_quota_is_max_files_exceeded(dir)) {
976 err = ceph_pre_init_acls(dir, &mode, &as_ctx);
979 err = ceph_security_init_secctx(dentry, mode, &as_ctx);
983 req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS);
989 req->r_dentry = dget(dentry);
992 set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags);
993 req->r_args.mkdir.mode = cpu_to_le32(mode);
994 req->r_dentry_drop = CEPH_CAP_FILE_SHARED | CEPH_CAP_AUTH_EXCL;
995 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
996 if (as_ctx.pagelist) {
997 req->r_pagelist = as_ctx.pagelist;
998 as_ctx.pagelist = NULL;
1000 err = ceph_mdsc_do_request(mdsc, dir, req);
1002 !req->r_reply_info.head->is_target &&
1003 !req->r_reply_info.head->is_dentry)
1004 err = ceph_handle_notrace_create(dir, dentry);
1005 ceph_mdsc_put_request(req);
1008 ceph_init_inode_acls(d_inode(dentry), &as_ctx);
1011 ceph_release_acl_sec_ctx(&as_ctx);
1015 static int ceph_link(struct dentry *old_dentry, struct inode *dir,
1016 struct dentry *dentry)
1018 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
1019 struct ceph_mds_client *mdsc = fsc->mdsc;
1020 struct ceph_mds_request *req;
1023 if (ceph_snap(dir) != CEPH_NOSNAP)
1026 dout("link in dir %p old_dentry %p dentry %p\n", dir,
1027 old_dentry, dentry);
1028 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_LINK, USE_AUTH_MDS);
1031 return PTR_ERR(req);
1033 req->r_dentry = dget(dentry);
1034 req->r_num_caps = 2;
1035 req->r_old_dentry = dget(old_dentry);
1036 req->r_parent = dir;
1037 set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags);
1038 req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
1039 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
1040 /* release LINK_SHARED on source inode (mds will lock it) */
1041 req->r_old_inode_drop = CEPH_CAP_LINK_SHARED | CEPH_CAP_LINK_EXCL;
1042 err = ceph_mdsc_do_request(mdsc, dir, req);
1045 } else if (!req->r_reply_info.head->is_dentry) {
1046 ihold(d_inode(old_dentry));
1047 d_instantiate(dentry, d_inode(old_dentry));
1049 ceph_mdsc_put_request(req);
1053 static void ceph_async_unlink_cb(struct ceph_mds_client *mdsc,
1054 struct ceph_mds_request *req)
1056 int result = req->r_err ? req->r_err :
1057 le32_to_cpu(req->r_reply_info.head->result);
1059 if (result == -EJUKEBOX)
1062 /* If op failed, mark everyone involved for errors */
1066 char *path = ceph_mdsc_build_path(req->r_dentry, &pathlen,
1069 /* mark error on parent + clear complete */
1070 mapping_set_error(req->r_parent->i_mapping, result);
1071 ceph_dir_clear_complete(req->r_parent);
1073 /* drop the dentry -- we don't know its status */
1074 if (!d_unhashed(req->r_dentry))
1075 d_drop(req->r_dentry);
1077 /* mark inode itself for an error (since metadata is bogus) */
1078 mapping_set_error(req->r_old_inode->i_mapping, result);
1080 pr_warn("ceph: async unlink failure path=(%llx)%s result=%d!\n",
1081 base, IS_ERR(path) ? "<<bad>>" : path, result);
1082 ceph_mdsc_free_path(path, pathlen);
1085 iput(req->r_old_inode);
1086 ceph_mdsc_release_dir_caps(req);
1089 static int get_caps_for_async_unlink(struct inode *dir, struct dentry *dentry)
1091 struct ceph_inode_info *ci = ceph_inode(dir);
1092 struct ceph_dentry_info *di;
1093 int got = 0, want = CEPH_CAP_FILE_EXCL | CEPH_CAP_DIR_UNLINK;
1095 spin_lock(&ci->i_ceph_lock);
1096 if ((__ceph_caps_issued(ci, NULL) & want) == want) {
1097 ceph_take_cap_refs(ci, want, false);
1100 spin_unlock(&ci->i_ceph_lock);
1102 /* If we didn't get anything, return 0 */
1106 spin_lock(&dentry->d_lock);
1107 di = ceph_dentry(dentry);
1109 * - We are holding Fx, which implies Fs caps.
1110 * - Only support async unlink for primary linkage
1112 if (atomic_read(&ci->i_shared_gen) != di->lease_shared_gen ||
1113 !(di->flags & CEPH_DENTRY_PRIMARY_LINK))
1115 spin_unlock(&dentry->d_lock);
1117 /* Do we still want what we've got? */
1121 ceph_put_cap_refs(ci, got);
1126 * rmdir and unlink are differ only by the metadata op code
1128 static int ceph_unlink(struct inode *dir, struct dentry *dentry)
1130 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
1131 struct ceph_mds_client *mdsc = fsc->mdsc;
1132 struct inode *inode = d_inode(dentry);
1133 struct ceph_mds_request *req;
1134 bool try_async = ceph_test_mount_opt(fsc, ASYNC_DIROPS);
1138 if (ceph_snap(dir) == CEPH_SNAPDIR) {
1139 /* rmdir .snap/foo is RMSNAP */
1140 dout("rmsnap dir %p '%pd' dn %p\n", dir, dentry, dentry);
1141 op = CEPH_MDS_OP_RMSNAP;
1142 } else if (ceph_snap(dir) == CEPH_NOSNAP) {
1143 dout("unlink/rmdir dir %p dn %p inode %p\n",
1144 dir, dentry, inode);
1145 op = d_is_dir(dentry) ?
1146 CEPH_MDS_OP_RMDIR : CEPH_MDS_OP_UNLINK;
1150 req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS);
1155 req->r_dentry = dget(dentry);
1156 req->r_num_caps = 2;
1157 req->r_parent = dir;
1158 req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
1159 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
1160 req->r_inode_drop = ceph_drop_caps_for_unlink(inode);
1162 if (try_async && op == CEPH_MDS_OP_UNLINK &&
1163 (req->r_dir_caps = get_caps_for_async_unlink(dir, dentry))) {
1164 dout("async unlink on %lu/%.*s caps=%s", dir->i_ino,
1165 dentry->d_name.len, dentry->d_name.name,
1166 ceph_cap_string(req->r_dir_caps));
1167 set_bit(CEPH_MDS_R_ASYNC, &req->r_req_flags);
1168 req->r_callback = ceph_async_unlink_cb;
1169 req->r_old_inode = d_inode(dentry);
1170 ihold(req->r_old_inode);
1171 err = ceph_mdsc_submit_request(mdsc, dir, req);
1174 * We have enough caps, so we assume that the unlink
1175 * will succeed. Fix up the target inode and dcache.
1179 } else if (err == -EJUKEBOX) {
1181 ceph_mdsc_put_request(req);
1185 set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags);
1186 err = ceph_mdsc_do_request(mdsc, dir, req);
1187 if (!err && !req->r_reply_info.head->is_dentry)
1191 ceph_mdsc_put_request(req);
1196 static int ceph_rename(struct inode *old_dir, struct dentry *old_dentry,
1197 struct inode *new_dir, struct dentry *new_dentry,
1200 struct ceph_fs_client *fsc = ceph_sb_to_client(old_dir->i_sb);
1201 struct ceph_mds_client *mdsc = fsc->mdsc;
1202 struct ceph_mds_request *req;
1203 int op = CEPH_MDS_OP_RENAME;
1209 if (ceph_snap(old_dir) != ceph_snap(new_dir))
1211 if (ceph_snap(old_dir) != CEPH_NOSNAP) {
1212 if (old_dir == new_dir && ceph_snap(old_dir) == CEPH_SNAPDIR)
1213 op = CEPH_MDS_OP_RENAMESNAP;
1216 } else if (old_dir != new_dir) {
1217 err = ceph_quota_check_rename(mdsc, d_inode(old_dentry),
1223 dout("rename dir %p dentry %p to dir %p dentry %p\n",
1224 old_dir, old_dentry, new_dir, new_dentry);
1225 req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS);
1227 return PTR_ERR(req);
1229 req->r_dentry = dget(new_dentry);
1230 req->r_num_caps = 2;
1231 req->r_old_dentry = dget(old_dentry);
1232 req->r_old_dentry_dir = old_dir;
1233 req->r_parent = new_dir;
1234 set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags);
1235 req->r_old_dentry_drop = CEPH_CAP_FILE_SHARED;
1236 req->r_old_dentry_unless = CEPH_CAP_FILE_EXCL;
1237 req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
1238 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
1239 /* release LINK_RDCACHE on source inode (mds will lock it) */
1240 req->r_old_inode_drop = CEPH_CAP_LINK_SHARED | CEPH_CAP_LINK_EXCL;
1241 if (d_really_is_positive(new_dentry)) {
1243 ceph_drop_caps_for_unlink(d_inode(new_dentry));
1245 err = ceph_mdsc_do_request(mdsc, old_dir, req);
1246 if (!err && !req->r_reply_info.head->is_dentry) {
1248 * Normally d_move() is done by fill_trace (called by
1249 * do_request, above). If there is no trace, we need
1252 d_move(old_dentry, new_dentry);
1254 ceph_mdsc_put_request(req);
1259 * Move dentry to tail of mdsc->dentry_leases list when lease is updated.
1260 * Leases at front of the list will expire first. (Assume all leases have
1263 * Called under dentry->d_lock.
1265 void __ceph_dentry_lease_touch(struct ceph_dentry_info *di)
1267 struct dentry *dn = di->dentry;
1268 struct ceph_mds_client *mdsc;
1270 dout("dentry_lease_touch %p %p '%pd'\n", di, dn, dn);
1272 di->flags |= CEPH_DENTRY_LEASE_LIST;
1273 if (di->flags & CEPH_DENTRY_SHRINK_LIST) {
1274 di->flags |= CEPH_DENTRY_REFERENCED;
1278 mdsc = ceph_sb_to_client(dn->d_sb)->mdsc;
1279 spin_lock(&mdsc->dentry_list_lock);
1280 list_move_tail(&di->lease_list, &mdsc->dentry_leases);
1281 spin_unlock(&mdsc->dentry_list_lock);
1284 static void __dentry_dir_lease_touch(struct ceph_mds_client* mdsc,
1285 struct ceph_dentry_info *di)
1287 di->flags &= ~(CEPH_DENTRY_LEASE_LIST | CEPH_DENTRY_REFERENCED);
1290 list_move_tail(&di->lease_list, &mdsc->dentry_dir_leases);
1294 * When dir lease is used, add dentry to tail of mdsc->dentry_dir_leases
1295 * list if it's not in the list, otherwise set 'referenced' flag.
1297 * Called under dentry->d_lock.
1299 void __ceph_dentry_dir_lease_touch(struct ceph_dentry_info *di)
1301 struct dentry *dn = di->dentry;
1302 struct ceph_mds_client *mdsc;
1304 dout("dentry_dir_lease_touch %p %p '%pd' (offset 0x%llx)\n",
1305 di, dn, dn, di->offset);
1307 if (!list_empty(&di->lease_list)) {
1308 if (di->flags & CEPH_DENTRY_LEASE_LIST) {
1309 /* don't remove dentry from dentry lease list
1310 * if its lease is valid */
1311 if (__dentry_lease_is_valid(di))
1314 di->flags |= CEPH_DENTRY_REFERENCED;
1319 if (di->flags & CEPH_DENTRY_SHRINK_LIST) {
1320 di->flags |= CEPH_DENTRY_REFERENCED;
1321 di->flags &= ~CEPH_DENTRY_LEASE_LIST;
1325 mdsc = ceph_sb_to_client(dn->d_sb)->mdsc;
1326 spin_lock(&mdsc->dentry_list_lock);
1327 __dentry_dir_lease_touch(mdsc, di),
1328 spin_unlock(&mdsc->dentry_list_lock);
1331 static void __dentry_lease_unlist(struct ceph_dentry_info *di)
1333 struct ceph_mds_client *mdsc;
1334 if (di->flags & CEPH_DENTRY_SHRINK_LIST)
1336 if (list_empty(&di->lease_list))
1339 mdsc = ceph_sb_to_client(di->dentry->d_sb)->mdsc;
1340 spin_lock(&mdsc->dentry_list_lock);
1341 list_del_init(&di->lease_list);
1342 spin_unlock(&mdsc->dentry_list_lock);
1352 struct ceph_lease_walk_control {
1354 bool expire_dir_lease;
1355 unsigned long nr_to_scan;
1356 unsigned long dir_lease_ttl;
1359 static unsigned long
1360 __dentry_leases_walk(struct ceph_mds_client *mdsc,
1361 struct ceph_lease_walk_control *lwc,
1362 int (*check)(struct dentry*, void*))
1364 struct ceph_dentry_info *di, *tmp;
1365 struct dentry *dentry, *last = NULL;
1366 struct list_head* list;
1368 unsigned long freed = 0;
1371 list = lwc->dir_lease ? &mdsc->dentry_dir_leases : &mdsc->dentry_leases;
1372 spin_lock(&mdsc->dentry_list_lock);
1373 list_for_each_entry_safe(di, tmp, list, lease_list) {
1374 if (!lwc->nr_to_scan)
1378 dentry = di->dentry;
1382 if (!spin_trylock(&dentry->d_lock))
1385 if (__lockref_is_dead(&dentry->d_lockref)) {
1386 list_del_init(&di->lease_list);
1390 ret = check(dentry, lwc);
1392 /* move it into tail of dir lease list */
1393 __dentry_dir_lease_touch(mdsc, di);
1399 di->flags &= ~CEPH_DENTRY_REFERENCED;
1400 if (dentry->d_lockref.count > 0) {
1401 /* update_dentry_lease() will re-add
1402 * it to lease list, or
1403 * ceph_d_delete() will return 1 when
1404 * last reference is dropped */
1405 list_del_init(&di->lease_list);
1407 di->flags |= CEPH_DENTRY_SHRINK_LIST;
1408 list_move_tail(&di->lease_list, &dispose);
1413 spin_unlock(&dentry->d_lock);
1417 spin_unlock(&mdsc->dentry_list_lock);
1419 while (!list_empty(&dispose)) {
1420 di = list_first_entry(&dispose, struct ceph_dentry_info,
1422 dentry = di->dentry;
1423 spin_lock(&dentry->d_lock);
1425 list_del_init(&di->lease_list);
1426 di->flags &= ~CEPH_DENTRY_SHRINK_LIST;
1427 if (di->flags & CEPH_DENTRY_REFERENCED) {
1428 spin_lock(&mdsc->dentry_list_lock);
1429 if (di->flags & CEPH_DENTRY_LEASE_LIST) {
1430 list_add_tail(&di->lease_list,
1431 &mdsc->dentry_leases);
1433 __dentry_dir_lease_touch(mdsc, di);
1435 spin_unlock(&mdsc->dentry_list_lock);
1440 spin_unlock(&dentry->d_lock);
1441 /* ceph_d_delete() does the trick */
1447 static int __dentry_lease_check(struct dentry *dentry, void *arg)
1449 struct ceph_dentry_info *di = ceph_dentry(dentry);
1452 if (__dentry_lease_is_valid(di))
1454 ret = __dir_lease_try_check(dentry);
1462 static int __dir_lease_check(struct dentry *dentry, void *arg)
1464 struct ceph_lease_walk_control *lwc = arg;
1465 struct ceph_dentry_info *di = ceph_dentry(dentry);
1467 int ret = __dir_lease_try_check(dentry);
1471 if (time_before(jiffies, di->time + lwc->dir_lease_ttl))
1473 /* Move dentry to tail of dir lease list if we don't want
1474 * to delete it. So dentries in the list are checked in a
1475 * round robin manner */
1476 if (!lwc->expire_dir_lease)
1478 if (dentry->d_lockref.count > 0 ||
1479 (di->flags & CEPH_DENTRY_REFERENCED))
1481 /* invalidate dir lease */
1482 di->lease_shared_gen = 0;
1487 int ceph_trim_dentries(struct ceph_mds_client *mdsc)
1489 struct ceph_lease_walk_control lwc;
1490 unsigned long count;
1491 unsigned long freed;
1493 spin_lock(&mdsc->caps_list_lock);
1494 if (mdsc->caps_use_max > 0 &&
1495 mdsc->caps_use_count > mdsc->caps_use_max)
1496 count = mdsc->caps_use_count - mdsc->caps_use_max;
1499 spin_unlock(&mdsc->caps_list_lock);
1501 lwc.dir_lease = false;
1502 lwc.nr_to_scan = CEPH_CAPS_PER_RELEASE * 2;
1503 freed = __dentry_leases_walk(mdsc, &lwc, __dentry_lease_check);
1504 if (!lwc.nr_to_scan) /* more invalid leases */
1507 if (lwc.nr_to_scan < CEPH_CAPS_PER_RELEASE)
1508 lwc.nr_to_scan = CEPH_CAPS_PER_RELEASE;
1510 lwc.dir_lease = true;
1511 lwc.expire_dir_lease = freed < count;
1512 lwc.dir_lease_ttl = mdsc->fsc->mount_options->caps_wanted_delay_max * HZ;
1513 freed +=__dentry_leases_walk(mdsc, &lwc, __dir_lease_check);
1514 if (!lwc.nr_to_scan) /* more to check */
1517 return freed > 0 ? 1 : 0;
1521 * Ensure a dentry lease will no longer revalidate.
1523 void ceph_invalidate_dentry_lease(struct dentry *dentry)
1525 struct ceph_dentry_info *di = ceph_dentry(dentry);
1526 spin_lock(&dentry->d_lock);
1528 di->lease_shared_gen = 0;
1529 di->flags &= ~CEPH_DENTRY_PRIMARY_LINK;
1530 __dentry_lease_unlist(di);
1531 spin_unlock(&dentry->d_lock);
1535 * Check if dentry lease is valid. If not, delete the lease. Try to
1536 * renew if the least is more than half up.
1538 static bool __dentry_lease_is_valid(struct ceph_dentry_info *di)
1540 struct ceph_mds_session *session;
1545 session = di->lease_session;
1550 spin_lock(&session->s_gen_ttl_lock);
1551 gen = session->s_cap_gen;
1552 ttl = session->s_cap_ttl;
1553 spin_unlock(&session->s_gen_ttl_lock);
1555 if (di->lease_gen == gen &&
1556 time_before(jiffies, ttl) &&
1557 time_before(jiffies, di->time))
1564 static int dentry_lease_is_valid(struct dentry *dentry, unsigned int flags)
1566 struct ceph_dentry_info *di;
1567 struct ceph_mds_session *session = NULL;
1571 spin_lock(&dentry->d_lock);
1572 di = ceph_dentry(dentry);
1573 if (di && __dentry_lease_is_valid(di)) {
1576 if (di->lease_renew_after &&
1577 time_after(jiffies, di->lease_renew_after)) {
1579 * We should renew. If we're in RCU walk mode
1580 * though, we can't do that so just return
1583 if (flags & LOOKUP_RCU) {
1586 session = ceph_get_mds_session(di->lease_session);
1587 seq = di->lease_seq;
1588 di->lease_renew_after = 0;
1589 di->lease_renew_from = jiffies;
1593 spin_unlock(&dentry->d_lock);
1596 ceph_mdsc_lease_send_msg(session, dentry,
1597 CEPH_MDS_LEASE_RENEW, seq);
1598 ceph_put_mds_session(session);
1600 dout("dentry_lease_is_valid - dentry %p = %d\n", dentry, valid);
1605 * Called under dentry->d_lock.
1607 static int __dir_lease_try_check(const struct dentry *dentry)
1609 struct ceph_dentry_info *di = ceph_dentry(dentry);
1611 struct ceph_inode_info *ci;
1614 if (!di->lease_shared_gen)
1616 if (IS_ROOT(dentry))
1619 dir = d_inode(dentry->d_parent);
1620 ci = ceph_inode(dir);
1622 if (spin_trylock(&ci->i_ceph_lock)) {
1623 if (atomic_read(&ci->i_shared_gen) == di->lease_shared_gen &&
1624 __ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 0))
1626 spin_unlock(&ci->i_ceph_lock);
1632 di->lease_shared_gen = 0;
1637 * Check if directory-wide content lease/cap is valid.
1639 static int dir_lease_is_valid(struct inode *dir, struct dentry *dentry,
1640 struct ceph_mds_client *mdsc)
1642 struct ceph_inode_info *ci = ceph_inode(dir);
1646 spin_lock(&ci->i_ceph_lock);
1647 valid = __ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1);
1649 __ceph_touch_fmode(ci, mdsc, CEPH_FILE_MODE_RD);
1650 shared_gen = atomic_read(&ci->i_shared_gen);
1652 spin_unlock(&ci->i_ceph_lock);
1654 struct ceph_dentry_info *di;
1655 spin_lock(&dentry->d_lock);
1656 di = ceph_dentry(dentry);
1657 if (dir == d_inode(dentry->d_parent) &&
1658 di && di->lease_shared_gen == shared_gen)
1659 __ceph_dentry_dir_lease_touch(di);
1662 spin_unlock(&dentry->d_lock);
1664 dout("dir_lease_is_valid dir %p v%u dentry %p = %d\n",
1665 dir, (unsigned)atomic_read(&ci->i_shared_gen), dentry, valid);
1670 * Check if cached dentry can be trusted.
1672 static int ceph_d_revalidate(struct dentry *dentry, unsigned int flags)
1675 struct dentry *parent;
1676 struct inode *dir, *inode;
1677 struct ceph_mds_client *mdsc;
1679 if (flags & LOOKUP_RCU) {
1680 parent = READ_ONCE(dentry->d_parent);
1681 dir = d_inode_rcu(parent);
1684 inode = d_inode_rcu(dentry);
1686 parent = dget_parent(dentry);
1687 dir = d_inode(parent);
1688 inode = d_inode(dentry);
1691 dout("d_revalidate %p '%pd' inode %p offset 0x%llx\n", dentry,
1692 dentry, inode, ceph_dentry(dentry)->offset);
1694 mdsc = ceph_sb_to_client(dir->i_sb)->mdsc;
1696 /* always trust cached snapped dentries, snapdir dentry */
1697 if (ceph_snap(dir) != CEPH_NOSNAP) {
1698 dout("d_revalidate %p '%pd' inode %p is SNAPPED\n", dentry,
1701 } else if (inode && ceph_snap(inode) == CEPH_SNAPDIR) {
1704 valid = dentry_lease_is_valid(dentry, flags);
1705 if (valid == -ECHILD)
1707 if (valid || dir_lease_is_valid(dir, dentry, mdsc)) {
1709 valid = ceph_is_any_caps(inode);
1716 struct ceph_mds_request *req;
1720 if (flags & LOOKUP_RCU)
1723 percpu_counter_inc(&mdsc->metric.d_lease_mis);
1725 op = ceph_snap(dir) == CEPH_SNAPDIR ?
1726 CEPH_MDS_OP_LOOKUPSNAP : CEPH_MDS_OP_LOOKUP;
1727 req = ceph_mdsc_create_request(mdsc, op, USE_ANY_MDS);
1729 req->r_dentry = dget(dentry);
1730 req->r_num_caps = 2;
1731 req->r_parent = dir;
1733 mask = CEPH_STAT_CAP_INODE | CEPH_CAP_AUTH_SHARED;
1734 if (ceph_security_xattr_wanted(dir))
1735 mask |= CEPH_CAP_XATTR_SHARED;
1736 req->r_args.getattr.mask = cpu_to_le32(mask);
1738 err = ceph_mdsc_do_request(mdsc, NULL, req);
1741 if (d_really_is_positive(dentry) &&
1742 d_inode(dentry) == req->r_target_inode)
1746 if (d_really_is_negative(dentry))
1752 ceph_mdsc_put_request(req);
1753 dout("d_revalidate %p lookup result=%d\n",
1757 percpu_counter_inc(&mdsc->metric.d_lease_hit);
1760 dout("d_revalidate %p %s\n", dentry, valid ? "valid" : "invalid");
1762 ceph_dir_clear_complete(dir);
1764 if (!(flags & LOOKUP_RCU))
1770 * Delete unused dentry that doesn't have valid lease
1772 * Called under dentry->d_lock.
1774 static int ceph_d_delete(const struct dentry *dentry)
1776 struct ceph_dentry_info *di;
1778 /* won't release caps */
1779 if (d_really_is_negative(dentry))
1781 if (ceph_snap(d_inode(dentry)) != CEPH_NOSNAP)
1784 di = ceph_dentry(dentry);
1786 if (__dentry_lease_is_valid(di))
1788 if (__dir_lease_try_check(dentry))
1795 * Release our ceph_dentry_info.
1797 static void ceph_d_release(struct dentry *dentry)
1799 struct ceph_dentry_info *di = ceph_dentry(dentry);
1800 struct ceph_fs_client *fsc = ceph_sb_to_client(dentry->d_sb);
1802 dout("d_release %p\n", dentry);
1804 atomic64_dec(&fsc->mdsc->metric.total_dentries);
1806 spin_lock(&dentry->d_lock);
1807 __dentry_lease_unlist(di);
1808 dentry->d_fsdata = NULL;
1809 spin_unlock(&dentry->d_lock);
1811 if (di->lease_session)
1812 ceph_put_mds_session(di->lease_session);
1813 kmem_cache_free(ceph_dentry_cachep, di);
1817 * When the VFS prunes a dentry from the cache, we need to clear the
1818 * complete flag on the parent directory.
1820 * Called under dentry->d_lock.
1822 static void ceph_d_prune(struct dentry *dentry)
1824 struct ceph_inode_info *dir_ci;
1825 struct ceph_dentry_info *di;
1827 dout("ceph_d_prune %pd %p\n", dentry, dentry);
1829 /* do we have a valid parent? */
1830 if (IS_ROOT(dentry))
1833 /* we hold d_lock, so d_parent is stable */
1834 dir_ci = ceph_inode(d_inode(dentry->d_parent));
1835 if (dir_ci->i_vino.snap == CEPH_SNAPDIR)
1838 /* who calls d_delete() should also disable dcache readdir */
1839 if (d_really_is_negative(dentry))
1842 /* d_fsdata does not get cleared until d_release */
1843 if (!d_unhashed(dentry)) {
1844 __ceph_dir_clear_complete(dir_ci);
1848 /* Disable dcache readdir just in case that someone called d_drop()
1849 * or d_invalidate(), but MDS didn't revoke CEPH_CAP_FILE_SHARED
1850 * properly (dcache readdir is still enabled) */
1851 di = ceph_dentry(dentry);
1852 if (di->offset > 0 &&
1853 di->lease_shared_gen == atomic_read(&dir_ci->i_shared_gen))
1854 __ceph_dir_clear_ordered(dir_ci);
1858 * read() on a dir. This weird interface hack only works if mounted
1859 * with '-o dirstat'.
1861 static ssize_t ceph_read_dir(struct file *file, char __user *buf, size_t size,
1864 struct ceph_dir_file_info *dfi = file->private_data;
1865 struct inode *inode = file_inode(file);
1866 struct ceph_inode_info *ci = ceph_inode(inode);
1868 const int bufsize = 1024;
1870 if (!ceph_test_mount_opt(ceph_sb_to_client(inode->i_sb), DIRSTAT))
1873 if (!dfi->dir_info) {
1874 dfi->dir_info = kmalloc(bufsize, GFP_KERNEL);
1878 snprintf(dfi->dir_info, bufsize,
1881 " subdirs: %20lld\n"
1882 "rentries: %20lld\n"
1884 " rsubdirs: %20lld\n"
1886 "rctime: %10lld.%09ld\n",
1887 ci->i_files + ci->i_subdirs,
1890 ci->i_rfiles + ci->i_rsubdirs,
1894 ci->i_rctime.tv_sec,
1895 ci->i_rctime.tv_nsec);
1898 if (*ppos >= dfi->dir_info_len)
1900 size = min_t(unsigned, size, dfi->dir_info_len-*ppos);
1901 left = copy_to_user(buf, dfi->dir_info + *ppos, size);
1904 *ppos += (size - left);
1911 * Return name hash for a given dentry. This is dependent on
1912 * the parent directory's hash function.
1914 unsigned ceph_dentry_hash(struct inode *dir, struct dentry *dn)
1916 struct ceph_inode_info *dci = ceph_inode(dir);
1919 switch (dci->i_dir_layout.dl_dir_hash) {
1920 case 0: /* for backward compat */
1921 case CEPH_STR_HASH_LINUX:
1922 return dn->d_name.hash;
1925 spin_lock(&dn->d_lock);
1926 hash = ceph_str_hash(dci->i_dir_layout.dl_dir_hash,
1927 dn->d_name.name, dn->d_name.len);
1928 spin_unlock(&dn->d_lock);
1933 const struct file_operations ceph_dir_fops = {
1934 .read = ceph_read_dir,
1935 .iterate = ceph_readdir,
1936 .llseek = ceph_dir_llseek,
1938 .release = ceph_release,
1939 .unlocked_ioctl = ceph_ioctl,
1940 .compat_ioctl = compat_ptr_ioctl,
1941 .fsync = ceph_fsync,
1943 .flock = ceph_flock,
1946 const struct file_operations ceph_snapdir_fops = {
1947 .iterate = ceph_readdir,
1948 .llseek = ceph_dir_llseek,
1950 .release = ceph_release,
1953 const struct inode_operations ceph_dir_iops = {
1954 .lookup = ceph_lookup,
1955 .permission = ceph_permission,
1956 .getattr = ceph_getattr,
1957 .setattr = ceph_setattr,
1958 .listxattr = ceph_listxattr,
1959 .get_acl = ceph_get_acl,
1960 .set_acl = ceph_set_acl,
1961 .mknod = ceph_mknod,
1962 .symlink = ceph_symlink,
1963 .mkdir = ceph_mkdir,
1965 .unlink = ceph_unlink,
1966 .rmdir = ceph_unlink,
1967 .rename = ceph_rename,
1968 .create = ceph_create,
1969 .atomic_open = ceph_atomic_open,
1972 const struct inode_operations ceph_snapdir_iops = {
1973 .lookup = ceph_lookup,
1974 .permission = ceph_permission,
1975 .getattr = ceph_getattr,
1976 .mkdir = ceph_mkdir,
1977 .rmdir = ceph_unlink,
1978 .rename = ceph_rename,
1981 const struct dentry_operations ceph_dentry_ops = {
1982 .d_revalidate = ceph_d_revalidate,
1983 .d_delete = ceph_d_delete,
1984 .d_release = ceph_d_release,
1985 .d_prune = ceph_d_prune,
1986 .d_init = ceph_d_init,