1 #include <linux/ceph/ceph_debug.h>
3 #include <linux/spinlock.h>
4 #include <linux/fs_struct.h>
5 #include <linux/namei.h>
6 #include <linux/slab.h>
7 #include <linux/sched.h>
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;
33 * Initialize ceph dentry state.
35 static int ceph_d_init(struct dentry *dentry)
37 struct ceph_dentry_info *di;
39 di = kmem_cache_zalloc(ceph_dentry_cachep, GFP_KERNEL);
41 return -ENOMEM; /* oh well */
44 di->lease_session = NULL;
46 dentry->d_fsdata = di;
47 ceph_dentry_lru_add(dentry);
52 * for f_pos for readdir:
54 * (0xff << 52) | ((24 bits hash) << 28) |
55 * (the nth entry has hash collision);
57 * ((frag value) << 28) | (the nth entry in frag);
59 #define OFFSET_BITS 28
60 #define OFFSET_MASK ((1 << OFFSET_BITS) - 1)
61 #define HASH_ORDER (0xffull << (OFFSET_BITS + 24))
62 loff_t ceph_make_fpos(unsigned high, unsigned off, bool hash_order)
64 loff_t fpos = ((loff_t)high << 28) | (loff_t)off;
70 static bool is_hash_order(loff_t p)
72 return (p & HASH_ORDER) == HASH_ORDER;
75 static unsigned fpos_frag(loff_t p)
77 return p >> OFFSET_BITS;
80 static unsigned fpos_hash(loff_t p)
82 return ceph_frag_value(fpos_frag(p));
85 static unsigned fpos_off(loff_t p)
87 return p & OFFSET_MASK;
90 static int fpos_cmp(loff_t l, loff_t r)
92 int v = ceph_frag_compare(fpos_frag(l), fpos_frag(r));
95 return (int)(fpos_off(l) - fpos_off(r));
99 * make note of the last dentry we read, so we can
100 * continue at the same lexicographical point,
101 * regardless of what dir changes take place on the
104 static int note_last_dentry(struct ceph_file_info *fi, const char *name,
105 int len, unsigned next_offset)
107 char *buf = kmalloc(len+1, GFP_KERNEL);
110 kfree(fi->last_name);
112 memcpy(fi->last_name, name, len);
113 fi->last_name[len] = 0;
114 fi->next_offset = next_offset;
115 dout("note_last_dentry '%s'\n", fi->last_name);
120 static struct dentry *
121 __dcache_find_get_entry(struct dentry *parent, u64 idx,
122 struct ceph_readdir_cache_control *cache_ctl)
124 struct inode *dir = d_inode(parent);
125 struct dentry *dentry;
126 unsigned idx_mask = (PAGE_SIZE / sizeof(struct dentry *)) - 1;
127 loff_t ptr_pos = idx * sizeof(struct dentry *);
128 pgoff_t ptr_pgoff = ptr_pos >> PAGE_SHIFT;
130 if (ptr_pos >= i_size_read(dir))
133 if (!cache_ctl->page || ptr_pgoff != page_index(cache_ctl->page)) {
134 ceph_readdir_cache_release(cache_ctl);
135 cache_ctl->page = find_lock_page(&dir->i_data, ptr_pgoff);
136 if (!cache_ctl->page) {
137 dout(" page %lu not found\n", ptr_pgoff);
138 return ERR_PTR(-EAGAIN);
140 /* reading/filling the cache are serialized by
141 i_mutex, no need to use page lock */
142 unlock_page(cache_ctl->page);
143 cache_ctl->dentries = kmap(cache_ctl->page);
146 cache_ctl->index = idx & idx_mask;
149 spin_lock(&parent->d_lock);
150 /* check i_size again here, because empty directory can be
151 * marked as complete while not holding the i_mutex. */
152 if (ceph_dir_is_complete_ordered(dir) && ptr_pos < i_size_read(dir))
153 dentry = cache_ctl->dentries[cache_ctl->index];
156 spin_unlock(&parent->d_lock);
157 if (dentry && !lockref_get_not_dead(&dentry->d_lockref))
160 return dentry ? : ERR_PTR(-EAGAIN);
164 * When possible, we try to satisfy a readdir by peeking at the
165 * dcache. We make this work by carefully ordering dentries on
166 * d_child when we initially get results back from the MDS, and
167 * falling back to a "normal" sync readdir if any dentries in the dir
170 * Complete dir indicates that we have all dentries in the dir. It is
171 * defined IFF we hold CEPH_CAP_FILE_SHARED (which will be revoked by
172 * the MDS if/when the directory is modified).
174 static int __dcache_readdir(struct file *file, struct dir_context *ctx,
177 struct ceph_file_info *fi = file->private_data;
178 struct dentry *parent = file->f_path.dentry;
179 struct inode *dir = d_inode(parent);
180 struct dentry *dentry, *last = NULL;
181 struct ceph_dentry_info *di;
182 struct ceph_readdir_cache_control cache_ctl = {};
186 dout("__dcache_readdir %p v%u at %llx\n", dir, shared_gen, ctx->pos);
188 /* search start position */
190 u64 count = div_u64(i_size_read(dir), sizeof(struct dentry *));
192 u64 step = count >> 1;
193 dentry = __dcache_find_get_entry(parent, idx + step,
196 /* use linar search */
200 if (IS_ERR(dentry)) {
201 err = PTR_ERR(dentry);
204 di = ceph_dentry(dentry);
205 spin_lock(&dentry->d_lock);
206 if (fpos_cmp(di->offset, ctx->pos) < 0) {
212 spin_unlock(&dentry->d_lock);
216 dout("__dcache_readdir %p cache idx %llu\n", dir, idx);
221 bool emit_dentry = false;
222 dentry = __dcache_find_get_entry(parent, idx++, &cache_ctl);
224 fi->flags |= CEPH_F_ATEND;
228 if (IS_ERR(dentry)) {
229 err = PTR_ERR(dentry);
233 di = ceph_dentry(dentry);
234 spin_lock(&dentry->d_lock);
235 if (di->lease_shared_gen == shared_gen &&
236 d_really_is_positive(dentry) &&
237 fpos_cmp(ctx->pos, di->offset) <= 0) {
240 spin_unlock(&dentry->d_lock);
243 dout(" %llx dentry %p %pd %p\n", di->offset,
244 dentry, dentry, d_inode(dentry));
245 ctx->pos = di->offset;
246 if (!dir_emit(ctx, dentry->d_name.name,
248 ceph_translate_ino(dentry->d_sb,
249 d_inode(dentry)->i_ino),
250 d_inode(dentry)->i_mode >> 12)) {
265 ceph_readdir_cache_release(&cache_ctl);
268 di = ceph_dentry(last);
269 ret = note_last_dentry(fi, last->d_name.name, last->d_name.len,
270 fpos_off(di->offset) + 1);
274 /* last_name no longer match cache index */
275 if (fi->readdir_cache_idx >= 0) {
276 fi->readdir_cache_idx = -1;
277 fi->dir_release_count = 0;
283 static bool need_send_readdir(struct ceph_file_info *fi, loff_t pos)
285 if (!fi->last_readdir)
287 if (is_hash_order(pos))
288 return !ceph_frag_contains_value(fi->frag, fpos_hash(pos));
290 return fi->frag != fpos_frag(pos);
293 static int ceph_readdir(struct file *file, struct dir_context *ctx)
295 struct ceph_file_info *fi = file->private_data;
296 struct inode *inode = file_inode(file);
297 struct ceph_inode_info *ci = ceph_inode(inode);
298 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
299 struct ceph_mds_client *mdsc = fsc->mdsc;
303 struct ceph_mds_reply_info_parsed *rinfo;
305 dout("readdir %p file %p pos %llx\n", inode, file, ctx->pos);
306 if (fi->flags & CEPH_F_ATEND)
309 /* always start with . and .. */
311 dout("readdir off 0 -> '.'\n");
312 if (!dir_emit(ctx, ".", 1,
313 ceph_translate_ino(inode->i_sb, inode->i_ino),
314 inode->i_mode >> 12))
319 ino_t ino = parent_ino(file->f_path.dentry);
320 dout("readdir off 1 -> '..'\n");
321 if (!dir_emit(ctx, "..", 2,
322 ceph_translate_ino(inode->i_sb, ino),
323 inode->i_mode >> 12))
328 /* can we use the dcache? */
329 spin_lock(&ci->i_ceph_lock);
330 if (ceph_test_mount_opt(fsc, DCACHE) &&
331 !ceph_test_mount_opt(fsc, NOASYNCREADDIR) &&
332 ceph_snap(inode) != CEPH_SNAPDIR &&
333 __ceph_dir_is_complete_ordered(ci) &&
334 __ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1)) {
335 u32 shared_gen = ci->i_shared_gen;
336 spin_unlock(&ci->i_ceph_lock);
337 err = __dcache_readdir(file, ctx, shared_gen);
341 spin_unlock(&ci->i_ceph_lock);
344 /* proceed with a normal readdir */
346 /* do we have the correct frag content buffered? */
347 if (need_send_readdir(fi, ctx->pos)) {
348 struct ceph_mds_request *req;
349 int op = ceph_snap(inode) == CEPH_SNAPDIR ?
350 CEPH_MDS_OP_LSSNAP : CEPH_MDS_OP_READDIR;
352 /* discard old result, if any */
353 if (fi->last_readdir) {
354 ceph_mdsc_put_request(fi->last_readdir);
355 fi->last_readdir = NULL;
358 if (is_hash_order(ctx->pos)) {
359 /* fragtree isn't always accurate. choose frag
360 * based on previous reply when possible. */
361 if (frag == (unsigned)-1)
362 frag = ceph_choose_frag(ci, fpos_hash(ctx->pos),
365 frag = fpos_frag(ctx->pos);
368 dout("readdir fetching %llx.%llx frag %x offset '%s'\n",
369 ceph_vinop(inode), frag, fi->last_name);
370 req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS);
373 err = ceph_alloc_readdir_reply_buffer(req, inode);
375 ceph_mdsc_put_request(req);
378 /* hints to request -> mds selection code */
379 req->r_direct_mode = USE_AUTH_MDS;
380 req->r_direct_hash = ceph_frag_value(frag);
381 __set_bit(CEPH_MDS_R_DIRECT_IS_HASH, &req->r_req_flags);
383 req->r_path2 = kstrdup(fi->last_name, GFP_KERNEL);
385 ceph_mdsc_put_request(req);
388 } else if (is_hash_order(ctx->pos)) {
389 req->r_args.readdir.offset_hash =
390 cpu_to_le32(fpos_hash(ctx->pos));
393 req->r_dir_release_cnt = fi->dir_release_count;
394 req->r_dir_ordered_cnt = fi->dir_ordered_count;
395 req->r_readdir_cache_idx = fi->readdir_cache_idx;
396 req->r_readdir_offset = fi->next_offset;
397 req->r_args.readdir.frag = cpu_to_le32(frag);
398 req->r_args.readdir.flags =
399 cpu_to_le16(CEPH_READDIR_REPLY_BITFLAGS);
401 req->r_inode = inode;
403 req->r_dentry = dget(file->f_path.dentry);
404 err = ceph_mdsc_do_request(mdsc, NULL, req);
406 ceph_mdsc_put_request(req);
409 dout("readdir got and parsed readdir result=%d on "
410 "frag %x, end=%d, complete=%d, hash_order=%d\n",
412 (int)req->r_reply_info.dir_end,
413 (int)req->r_reply_info.dir_complete,
414 (int)req->r_reply_info.hash_order);
416 rinfo = &req->r_reply_info;
417 if (le32_to_cpu(rinfo->dir_dir->frag) != frag) {
418 frag = le32_to_cpu(rinfo->dir_dir->frag);
419 if (!rinfo->hash_order) {
420 fi->next_offset = req->r_readdir_offset;
421 /* adjust ctx->pos to beginning of frag */
422 ctx->pos = ceph_make_fpos(frag,
429 fi->last_readdir = req;
431 if (test_bit(CEPH_MDS_R_DID_PREPOPULATE, &req->r_req_flags)) {
432 fi->readdir_cache_idx = req->r_readdir_cache_idx;
433 if (fi->readdir_cache_idx < 0) {
434 /* preclude from marking dir ordered */
435 fi->dir_ordered_count = 0;
436 } else if (ceph_frag_is_leftmost(frag) &&
437 fi->next_offset == 2) {
438 /* note dir version at start of readdir so
439 * we can tell if any dentries get dropped */
440 fi->dir_release_count = req->r_dir_release_cnt;
441 fi->dir_ordered_count = req->r_dir_ordered_cnt;
444 dout("readdir !did_prepopulate");
445 /* disable readdir cache */
446 fi->readdir_cache_idx = -1;
447 /* preclude from marking dir complete */
448 fi->dir_release_count = 0;
451 /* note next offset and last dentry name */
452 if (rinfo->dir_nr > 0) {
453 struct ceph_mds_reply_dir_entry *rde =
454 rinfo->dir_entries + (rinfo->dir_nr-1);
455 unsigned next_offset = req->r_reply_info.dir_end ?
456 2 : (fpos_off(rde->offset) + 1);
457 err = note_last_dentry(fi, rde->name, rde->name_len,
461 } else if (req->r_reply_info.dir_end) {
467 rinfo = &fi->last_readdir->r_reply_info;
468 dout("readdir frag %x num %d pos %llx chunk first %llx\n",
469 fi->frag, rinfo->dir_nr, ctx->pos,
470 rinfo->dir_nr ? rinfo->dir_entries[0].offset : 0LL);
473 /* search start position */
474 if (rinfo->dir_nr > 0) {
475 int step, nr = rinfo->dir_nr;
478 if (rinfo->dir_entries[i + step].offset < ctx->pos) {
486 for (; i < rinfo->dir_nr; i++) {
487 struct ceph_mds_reply_dir_entry *rde = rinfo->dir_entries + i;
488 struct ceph_vino vino;
492 BUG_ON(rde->offset < ctx->pos);
494 ctx->pos = rde->offset;
495 dout("readdir (%d/%d) -> %llx '%.*s' %p\n",
496 i, rinfo->dir_nr, ctx->pos,
497 rde->name_len, rde->name, &rde->inode.in);
499 BUG_ON(!rde->inode.in);
500 ftype = le32_to_cpu(rde->inode.in->mode) >> 12;
501 vino.ino = le64_to_cpu(rde->inode.in->ino);
502 vino.snap = le64_to_cpu(rde->inode.in->snapid);
503 ino = ceph_vino_to_ino(vino);
505 if (!dir_emit(ctx, rde->name, rde->name_len,
506 ceph_translate_ino(inode->i_sb, ino), ftype)) {
507 dout("filldir stopping us...\n");
513 ceph_mdsc_put_request(fi->last_readdir);
514 fi->last_readdir = NULL;
516 if (fi->next_offset > 2) {
522 if (!ceph_frag_is_rightmost(fi->frag)) {
523 frag = ceph_frag_next(fi->frag);
524 if (is_hash_order(ctx->pos)) {
525 loff_t new_pos = ceph_make_fpos(ceph_frag_value(frag),
526 fi->next_offset, true);
527 if (new_pos > ctx->pos)
531 ctx->pos = ceph_make_fpos(frag, fi->next_offset, false);
532 kfree(fi->last_name);
533 fi->last_name = NULL;
535 dout("readdir next frag is %x\n", frag);
538 fi->flags |= CEPH_F_ATEND;
541 * if dir_release_count still matches the dir, no dentries
542 * were released during the whole readdir, and we should have
543 * the complete dir contents in our cache.
545 if (atomic64_read(&ci->i_release_count) == fi->dir_release_count) {
546 spin_lock(&ci->i_ceph_lock);
547 if (fi->dir_ordered_count == atomic64_read(&ci->i_ordered_count)) {
548 dout(" marking %p complete and ordered\n", inode);
549 /* use i_size to track number of entries in
551 BUG_ON(fi->readdir_cache_idx < 0);
552 i_size_write(inode, fi->readdir_cache_idx *
553 sizeof(struct dentry*));
555 dout(" marking %p complete\n", inode);
557 __ceph_dir_set_complete(ci, fi->dir_release_count,
558 fi->dir_ordered_count);
559 spin_unlock(&ci->i_ceph_lock);
562 dout("readdir %p file %p done.\n", inode, file);
566 static void reset_readdir(struct ceph_file_info *fi)
568 if (fi->last_readdir) {
569 ceph_mdsc_put_request(fi->last_readdir);
570 fi->last_readdir = NULL;
572 kfree(fi->last_name);
573 fi->last_name = NULL;
574 fi->dir_release_count = 0;
575 fi->readdir_cache_idx = -1;
576 fi->next_offset = 2; /* compensate for . and .. */
577 fi->flags &= ~CEPH_F_ATEND;
581 * discard buffered readdir content on seekdir(0), or seek to new frag,
582 * or seek prior to current chunk
584 static bool need_reset_readdir(struct ceph_file_info *fi, loff_t new_pos)
586 struct ceph_mds_reply_info_parsed *rinfo;
590 if (is_hash_order(new_pos)) {
591 /* no need to reset last_name for a forward seek when
592 * dentries are sotred in hash order */
593 } else if (fi->frag != fpos_frag(new_pos)) {
596 rinfo = fi->last_readdir ? &fi->last_readdir->r_reply_info : NULL;
597 if (!rinfo || !rinfo->dir_nr)
599 chunk_offset = rinfo->dir_entries[0].offset;
600 return new_pos < chunk_offset ||
601 is_hash_order(new_pos) != is_hash_order(chunk_offset);
604 static loff_t ceph_dir_llseek(struct file *file, loff_t offset, int whence)
606 struct ceph_file_info *fi = file->private_data;
607 struct inode *inode = file->f_mapping->host;
614 offset += file->f_pos;
618 retval = -EOPNOTSUPP;
624 if (need_reset_readdir(fi, offset)) {
625 dout("dir_llseek dropping %p content\n", file);
627 } else if (is_hash_order(offset) && offset > file->f_pos) {
628 /* for hash offset, we don't know if a forward seek
629 * is within same frag */
630 fi->dir_release_count = 0;
631 fi->readdir_cache_idx = -1;
634 if (offset != file->f_pos) {
635 file->f_pos = offset;
637 fi->flags &= ~CEPH_F_ATEND;
647 * Handle lookups for the hidden .snap directory.
649 int ceph_handle_snapdir(struct ceph_mds_request *req,
650 struct dentry *dentry, int err)
652 struct ceph_fs_client *fsc = ceph_sb_to_client(dentry->d_sb);
653 struct inode *parent = d_inode(dentry->d_parent); /* we hold i_mutex */
656 if (err == -ENOENT &&
657 ceph_snap(parent) == CEPH_NOSNAP &&
658 strcmp(dentry->d_name.name,
659 fsc->mount_options->snapdir_name) == 0) {
660 struct inode *inode = ceph_get_snapdir(parent);
661 dout("ENOENT on snapdir %p '%pd', linking to snapdir %p\n",
662 dentry, dentry, inode);
663 BUG_ON(!d_unhashed(dentry));
664 d_add(dentry, inode);
671 * Figure out final result of a lookup/open request.
673 * Mainly, make sure we return the final req->r_dentry (if it already
674 * existed) in place of the original VFS-provided dentry when they
677 * Gracefully handle the case where the MDS replies with -ENOENT and
678 * no trace (which it may do, at its discretion, e.g., if it doesn't
679 * care to issue a lease on the negative dentry).
681 struct dentry *ceph_finish_lookup(struct ceph_mds_request *req,
682 struct dentry *dentry, int err)
684 if (err == -ENOENT) {
687 if (!req->r_reply_info.head->is_dentry) {
688 dout("ENOENT and no trace, dentry %p inode %p\n",
689 dentry, d_inode(dentry));
690 if (d_really_is_positive(dentry)) {
699 dentry = ERR_PTR(err);
700 else if (dentry != req->r_dentry)
701 dentry = dget(req->r_dentry); /* we got spliced */
707 static bool is_root_ceph_dentry(struct inode *inode, struct dentry *dentry)
709 return ceph_ino(inode) == CEPH_INO_ROOT &&
710 strncmp(dentry->d_name.name, ".ceph", 5) == 0;
714 * Look up a single dir entry. If there is a lookup intent, inform
715 * the MDS so that it gets our 'caps wanted' value in a single op.
717 static struct dentry *ceph_lookup(struct inode *dir, struct dentry *dentry,
720 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
721 struct ceph_mds_client *mdsc = fsc->mdsc;
722 struct ceph_mds_request *req;
727 dout("lookup %p dentry %p '%pd'\n",
728 dir, dentry, dentry);
730 if (dentry->d_name.len > NAME_MAX)
731 return ERR_PTR(-ENAMETOOLONG);
733 /* can we conclude ENOENT locally? */
734 if (d_really_is_negative(dentry)) {
735 struct ceph_inode_info *ci = ceph_inode(dir);
736 struct ceph_dentry_info *di = ceph_dentry(dentry);
738 spin_lock(&ci->i_ceph_lock);
739 dout(" dir %p flags are %d\n", dir, ci->i_ceph_flags);
740 if (strncmp(dentry->d_name.name,
741 fsc->mount_options->snapdir_name,
742 dentry->d_name.len) &&
743 !is_root_ceph_dentry(dir, dentry) &&
744 ceph_test_mount_opt(fsc, DCACHE) &&
745 __ceph_dir_is_complete(ci) &&
746 (__ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1))) {
747 spin_unlock(&ci->i_ceph_lock);
748 dout(" dir %p complete, -ENOENT\n", dir);
750 di->lease_shared_gen = ci->i_shared_gen;
753 spin_unlock(&ci->i_ceph_lock);
756 op = ceph_snap(dir) == CEPH_SNAPDIR ?
757 CEPH_MDS_OP_LOOKUPSNAP : CEPH_MDS_OP_LOOKUP;
758 req = ceph_mdsc_create_request(mdsc, op, USE_ANY_MDS);
760 return ERR_CAST(req);
761 req->r_dentry = dget(dentry);
764 mask = CEPH_STAT_CAP_INODE | CEPH_CAP_AUTH_SHARED;
765 if (ceph_security_xattr_wanted(dir))
766 mask |= CEPH_CAP_XATTR_SHARED;
767 req->r_args.getattr.mask = cpu_to_le32(mask);
770 set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags);
771 err = ceph_mdsc_do_request(mdsc, NULL, req);
772 err = ceph_handle_snapdir(req, dentry, err);
773 dentry = ceph_finish_lookup(req, dentry, err);
774 ceph_mdsc_put_request(req); /* will dput(dentry) */
775 dout("lookup result=%p\n", dentry);
780 * If we do a create but get no trace back from the MDS, follow up with
781 * a lookup (the VFS expects us to link up the provided dentry).
783 int ceph_handle_notrace_create(struct inode *dir, struct dentry *dentry)
785 struct dentry *result = ceph_lookup(dir, dentry, 0);
787 if (result && !IS_ERR(result)) {
789 * We created the item, then did a lookup, and found
790 * it was already linked to another inode we already
791 * had in our cache (and thus got spliced). To not
792 * confuse VFS (especially when inode is a directory),
793 * we don't link our dentry to that inode, return an
796 * This event should be rare and it happens only when
797 * we talk to old MDS. Recent MDS does not send traceless
798 * reply for request that creates new inode.
803 return PTR_ERR(result);
806 static int ceph_mknod(struct inode *dir, struct dentry *dentry,
807 umode_t mode, dev_t rdev)
809 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
810 struct ceph_mds_client *mdsc = fsc->mdsc;
811 struct ceph_mds_request *req;
812 struct ceph_acls_info acls = {};
815 if (ceph_snap(dir) != CEPH_NOSNAP)
818 err = ceph_pre_init_acls(dir, &mode, &acls);
822 dout("mknod in dir %p dentry %p mode 0%ho rdev %d\n",
823 dir, dentry, mode, rdev);
824 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_MKNOD, USE_AUTH_MDS);
829 req->r_dentry = dget(dentry);
832 set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags);
833 req->r_args.mknod.mode = cpu_to_le32(mode);
834 req->r_args.mknod.rdev = cpu_to_le32(rdev);
835 req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
836 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
838 req->r_pagelist = acls.pagelist;
839 acls.pagelist = NULL;
841 err = ceph_mdsc_do_request(mdsc, dir, req);
842 if (!err && !req->r_reply_info.head->is_dentry)
843 err = ceph_handle_notrace_create(dir, dentry);
844 ceph_mdsc_put_request(req);
847 ceph_init_inode_acls(d_inode(dentry), &acls);
850 ceph_release_acls_info(&acls);
854 static int ceph_create(struct inode *dir, struct dentry *dentry, umode_t mode,
857 return ceph_mknod(dir, dentry, mode, 0);
860 static int ceph_symlink(struct inode *dir, struct dentry *dentry,
863 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
864 struct ceph_mds_client *mdsc = fsc->mdsc;
865 struct ceph_mds_request *req;
868 if (ceph_snap(dir) != CEPH_NOSNAP)
871 dout("symlink in dir %p dentry %p to '%s'\n", dir, dentry, dest);
872 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SYMLINK, USE_AUTH_MDS);
877 req->r_path2 = kstrdup(dest, GFP_KERNEL);
880 ceph_mdsc_put_request(req);
884 set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags);
885 req->r_dentry = dget(dentry);
887 req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
888 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
889 err = ceph_mdsc_do_request(mdsc, dir, req);
890 if (!err && !req->r_reply_info.head->is_dentry)
891 err = ceph_handle_notrace_create(dir, dentry);
892 ceph_mdsc_put_request(req);
899 static int ceph_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
901 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
902 struct ceph_mds_client *mdsc = fsc->mdsc;
903 struct ceph_mds_request *req;
904 struct ceph_acls_info acls = {};
908 if (ceph_snap(dir) == CEPH_SNAPDIR) {
909 /* mkdir .snap/foo is a MKSNAP */
910 op = CEPH_MDS_OP_MKSNAP;
911 dout("mksnap dir %p snap '%pd' dn %p\n", dir,
913 } else if (ceph_snap(dir) == CEPH_NOSNAP) {
914 dout("mkdir dir %p dn %p mode 0%ho\n", dir, dentry, mode);
915 op = CEPH_MDS_OP_MKDIR;
921 err = ceph_pre_init_acls(dir, &mode, &acls);
925 req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS);
931 req->r_dentry = dget(dentry);
934 set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags);
935 req->r_args.mkdir.mode = cpu_to_le32(mode);
936 req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
937 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
939 req->r_pagelist = acls.pagelist;
940 acls.pagelist = NULL;
942 err = ceph_mdsc_do_request(mdsc, dir, req);
944 !req->r_reply_info.head->is_target &&
945 !req->r_reply_info.head->is_dentry)
946 err = ceph_handle_notrace_create(dir, dentry);
947 ceph_mdsc_put_request(req);
950 ceph_init_inode_acls(d_inode(dentry), &acls);
953 ceph_release_acls_info(&acls);
957 static int ceph_link(struct dentry *old_dentry, struct inode *dir,
958 struct dentry *dentry)
960 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
961 struct ceph_mds_client *mdsc = fsc->mdsc;
962 struct ceph_mds_request *req;
965 if (ceph_snap(dir) != CEPH_NOSNAP)
968 dout("link in dir %p old_dentry %p dentry %p\n", dir,
970 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_LINK, USE_AUTH_MDS);
975 req->r_dentry = dget(dentry);
977 req->r_old_dentry = dget(old_dentry);
979 set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags);
980 req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
981 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
982 /* release LINK_SHARED on source inode (mds will lock it) */
983 req->r_old_inode_drop = CEPH_CAP_LINK_SHARED;
984 err = ceph_mdsc_do_request(mdsc, dir, req);
987 } else if (!req->r_reply_info.head->is_dentry) {
988 ihold(d_inode(old_dentry));
989 d_instantiate(dentry, d_inode(old_dentry));
991 ceph_mdsc_put_request(req);
996 * For a soon-to-be unlinked file, drop the AUTH_RDCACHE caps. If it
997 * looks like the link count will hit 0, drop any other caps (other
998 * than PIN) we don't specifically want (due to the file still being
1001 static int drop_caps_for_unlink(struct inode *inode)
1003 struct ceph_inode_info *ci = ceph_inode(inode);
1004 int drop = CEPH_CAP_LINK_SHARED | CEPH_CAP_LINK_EXCL;
1006 spin_lock(&ci->i_ceph_lock);
1007 if (inode->i_nlink == 1) {
1008 drop |= ~(__ceph_caps_wanted(ci) | CEPH_CAP_PIN);
1009 ci->i_ceph_flags |= CEPH_I_NODELAY;
1011 spin_unlock(&ci->i_ceph_lock);
1016 * rmdir and unlink are differ only by the metadata op code
1018 static int ceph_unlink(struct inode *dir, struct dentry *dentry)
1020 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
1021 struct ceph_mds_client *mdsc = fsc->mdsc;
1022 struct inode *inode = d_inode(dentry);
1023 struct ceph_mds_request *req;
1027 if (ceph_snap(dir) == CEPH_SNAPDIR) {
1028 /* rmdir .snap/foo is RMSNAP */
1029 dout("rmsnap dir %p '%pd' dn %p\n", dir, dentry, dentry);
1030 op = CEPH_MDS_OP_RMSNAP;
1031 } else if (ceph_snap(dir) == CEPH_NOSNAP) {
1032 dout("unlink/rmdir dir %p dn %p inode %p\n",
1033 dir, dentry, inode);
1034 op = d_is_dir(dentry) ?
1035 CEPH_MDS_OP_RMDIR : CEPH_MDS_OP_UNLINK;
1038 req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS);
1043 req->r_dentry = dget(dentry);
1044 req->r_num_caps = 2;
1045 req->r_parent = dir;
1046 set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags);
1047 req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
1048 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
1049 req->r_inode_drop = drop_caps_for_unlink(inode);
1050 err = ceph_mdsc_do_request(mdsc, dir, req);
1051 if (!err && !req->r_reply_info.head->is_dentry)
1053 ceph_mdsc_put_request(req);
1058 static int ceph_rename(struct inode *old_dir, struct dentry *old_dentry,
1059 struct inode *new_dir, struct dentry *new_dentry,
1062 struct ceph_fs_client *fsc = ceph_sb_to_client(old_dir->i_sb);
1063 struct ceph_mds_client *mdsc = fsc->mdsc;
1064 struct ceph_mds_request *req;
1065 int op = CEPH_MDS_OP_RENAME;
1071 if (ceph_snap(old_dir) != ceph_snap(new_dir))
1073 if (ceph_snap(old_dir) != CEPH_NOSNAP) {
1074 if (old_dir == new_dir && ceph_snap(old_dir) == CEPH_SNAPDIR)
1075 op = CEPH_MDS_OP_RENAMESNAP;
1079 dout("rename dir %p dentry %p to dir %p dentry %p\n",
1080 old_dir, old_dentry, new_dir, new_dentry);
1081 req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS);
1083 return PTR_ERR(req);
1085 req->r_dentry = dget(new_dentry);
1086 req->r_num_caps = 2;
1087 req->r_old_dentry = dget(old_dentry);
1088 req->r_old_dentry_dir = old_dir;
1089 req->r_parent = new_dir;
1090 set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags);
1091 req->r_old_dentry_drop = CEPH_CAP_FILE_SHARED;
1092 req->r_old_dentry_unless = CEPH_CAP_FILE_EXCL;
1093 req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
1094 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
1095 /* release LINK_RDCACHE on source inode (mds will lock it) */
1096 req->r_old_inode_drop = CEPH_CAP_LINK_SHARED;
1097 if (d_really_is_positive(new_dentry))
1098 req->r_inode_drop = drop_caps_for_unlink(d_inode(new_dentry));
1099 err = ceph_mdsc_do_request(mdsc, old_dir, req);
1100 if (!err && !req->r_reply_info.head->is_dentry) {
1102 * Normally d_move() is done by fill_trace (called by
1103 * do_request, above). If there is no trace, we need
1107 /* d_move screws up sibling dentries' offsets */
1108 ceph_dir_clear_complete(old_dir);
1109 ceph_dir_clear_complete(new_dir);
1111 d_move(old_dentry, new_dentry);
1113 /* ensure target dentry is invalidated, despite
1114 rehashing bug in vfs_rename_dir */
1115 ceph_invalidate_dentry_lease(new_dentry);
1117 ceph_mdsc_put_request(req);
1122 * Ensure a dentry lease will no longer revalidate.
1124 void ceph_invalidate_dentry_lease(struct dentry *dentry)
1126 spin_lock(&dentry->d_lock);
1127 ceph_dentry(dentry)->time = jiffies;
1128 ceph_dentry(dentry)->lease_shared_gen = 0;
1129 spin_unlock(&dentry->d_lock);
1133 * Check if dentry lease is valid. If not, delete the lease. Try to
1134 * renew if the least is more than half up.
1136 static int dentry_lease_is_valid(struct dentry *dentry, unsigned int flags,
1139 struct ceph_dentry_info *di;
1140 struct ceph_mds_session *s;
1144 struct ceph_mds_session *session = NULL;
1147 spin_lock(&dentry->d_lock);
1148 di = ceph_dentry(dentry);
1149 if (di && di->lease_session) {
1150 s = di->lease_session;
1151 spin_lock(&s->s_gen_ttl_lock);
1154 spin_unlock(&s->s_gen_ttl_lock);
1156 if (di->lease_gen == gen &&
1157 time_before(jiffies, di->time) &&
1158 time_before(jiffies, ttl)) {
1160 if (di->lease_renew_after &&
1161 time_after(jiffies, di->lease_renew_after)) {
1163 * We should renew. If we're in RCU walk mode
1164 * though, we can't do that so just return
1167 if (flags & LOOKUP_RCU) {
1170 session = ceph_get_mds_session(s);
1171 seq = di->lease_seq;
1172 di->lease_renew_after = 0;
1173 di->lease_renew_from = jiffies;
1178 spin_unlock(&dentry->d_lock);
1181 ceph_mdsc_lease_send_msg(session, dir, dentry,
1182 CEPH_MDS_LEASE_RENEW, seq);
1183 ceph_put_mds_session(session);
1185 dout("dentry_lease_is_valid - dentry %p = %d\n", dentry, valid);
1190 * Check if directory-wide content lease/cap is valid.
1192 static int dir_lease_is_valid(struct inode *dir, struct dentry *dentry)
1194 struct ceph_inode_info *ci = ceph_inode(dir);
1195 struct ceph_dentry_info *di = ceph_dentry(dentry);
1198 spin_lock(&ci->i_ceph_lock);
1199 if (ci->i_shared_gen == di->lease_shared_gen)
1200 valid = __ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1);
1201 spin_unlock(&ci->i_ceph_lock);
1202 dout("dir_lease_is_valid dir %p v%u dentry %p v%u = %d\n",
1203 dir, (unsigned)ci->i_shared_gen, dentry,
1204 (unsigned)di->lease_shared_gen, valid);
1209 * Check if cached dentry can be trusted.
1211 static int ceph_d_revalidate(struct dentry *dentry, unsigned int flags)
1214 struct dentry *parent;
1217 if (flags & LOOKUP_RCU) {
1218 parent = READ_ONCE(dentry->d_parent);
1219 dir = d_inode_rcu(parent);
1223 parent = dget_parent(dentry);
1224 dir = d_inode(parent);
1227 dout("d_revalidate %p '%pd' inode %p offset %lld\n", dentry,
1228 dentry, d_inode(dentry), ceph_dentry(dentry)->offset);
1230 /* always trust cached snapped dentries, snapdir dentry */
1231 if (ceph_snap(dir) != CEPH_NOSNAP) {
1232 dout("d_revalidate %p '%pd' inode %p is SNAPPED\n", dentry,
1233 dentry, d_inode(dentry));
1235 } else if (d_really_is_positive(dentry) &&
1236 ceph_snap(d_inode(dentry)) == CEPH_SNAPDIR) {
1239 valid = dentry_lease_is_valid(dentry, flags, dir);
1240 if (valid == -ECHILD)
1242 if (valid || dir_lease_is_valid(dir, dentry)) {
1243 if (d_really_is_positive(dentry))
1244 valid = ceph_is_any_caps(d_inode(dentry));
1251 struct ceph_mds_client *mdsc =
1252 ceph_sb_to_client(dir->i_sb)->mdsc;
1253 struct ceph_mds_request *req;
1257 if (flags & LOOKUP_RCU)
1260 op = ceph_snap(dir) == CEPH_SNAPDIR ?
1261 CEPH_MDS_OP_LOOKUPSNAP : CEPH_MDS_OP_LOOKUP;
1262 req = ceph_mdsc_create_request(mdsc, op, USE_ANY_MDS);
1264 req->r_dentry = dget(dentry);
1265 req->r_num_caps = 2;
1266 req->r_parent = dir;
1268 mask = CEPH_STAT_CAP_INODE | CEPH_CAP_AUTH_SHARED;
1269 if (ceph_security_xattr_wanted(dir))
1270 mask |= CEPH_CAP_XATTR_SHARED;
1271 req->r_args.getattr.mask = cpu_to_le32(mask);
1273 err = ceph_mdsc_do_request(mdsc, NULL, req);
1276 if (d_really_is_positive(dentry) &&
1277 d_inode(dentry) == req->r_target_inode)
1281 if (d_really_is_negative(dentry))
1287 ceph_mdsc_put_request(req);
1288 dout("d_revalidate %p lookup result=%d\n",
1293 dout("d_revalidate %p %s\n", dentry, valid ? "valid" : "invalid");
1295 ceph_dentry_lru_touch(dentry);
1297 ceph_dir_clear_complete(dir);
1300 if (!(flags & LOOKUP_RCU))
1306 * Release our ceph_dentry_info.
1308 static void ceph_d_release(struct dentry *dentry)
1310 struct ceph_dentry_info *di = ceph_dentry(dentry);
1312 dout("d_release %p\n", dentry);
1313 ceph_dentry_lru_del(dentry);
1315 spin_lock(&dentry->d_lock);
1316 dentry->d_fsdata = NULL;
1317 spin_unlock(&dentry->d_lock);
1319 if (di->lease_session)
1320 ceph_put_mds_session(di->lease_session);
1321 kmem_cache_free(ceph_dentry_cachep, di);
1325 * When the VFS prunes a dentry from the cache, we need to clear the
1326 * complete flag on the parent directory.
1328 * Called under dentry->d_lock.
1330 static void ceph_d_prune(struct dentry *dentry)
1332 dout("ceph_d_prune %p\n", dentry);
1334 /* do we have a valid parent? */
1335 if (IS_ROOT(dentry))
1338 /* if we are not hashed, we don't affect dir's completeness */
1339 if (d_unhashed(dentry))
1342 if (ceph_snap(d_inode(dentry->d_parent)) == CEPH_SNAPDIR)
1346 * we hold d_lock, so d_parent is stable, and d_fsdata is never
1347 * cleared until d_release
1349 ceph_dir_clear_complete(d_inode(dentry->d_parent));
1353 * read() on a dir. This weird interface hack only works if mounted
1354 * with '-o dirstat'.
1356 static ssize_t ceph_read_dir(struct file *file, char __user *buf, size_t size,
1359 struct ceph_file_info *cf = file->private_data;
1360 struct inode *inode = file_inode(file);
1361 struct ceph_inode_info *ci = ceph_inode(inode);
1363 const int bufsize = 1024;
1365 if (!ceph_test_mount_opt(ceph_sb_to_client(inode->i_sb), DIRSTAT))
1368 if (!cf->dir_info) {
1369 cf->dir_info = kmalloc(bufsize, GFP_KERNEL);
1373 snprintf(cf->dir_info, bufsize,
1376 " subdirs: %20lld\n"
1377 "rentries: %20lld\n"
1379 " rsubdirs: %20lld\n"
1381 "rctime: %10ld.%09ld\n",
1382 ci->i_files + ci->i_subdirs,
1385 ci->i_rfiles + ci->i_rsubdirs,
1389 (long)ci->i_rctime.tv_sec,
1390 (long)ci->i_rctime.tv_nsec);
1393 if (*ppos >= cf->dir_info_len)
1395 size = min_t(unsigned, size, cf->dir_info_len-*ppos);
1396 left = copy_to_user(buf, cf->dir_info + *ppos, size);
1399 *ppos += (size - left);
1404 * We maintain a private dentry LRU.
1406 * FIXME: this needs to be changed to a per-mds lru to be useful.
1408 void ceph_dentry_lru_add(struct dentry *dn)
1410 struct ceph_dentry_info *di = ceph_dentry(dn);
1411 struct ceph_mds_client *mdsc;
1413 dout("dentry_lru_add %p %p '%pd'\n", di, dn, dn);
1414 mdsc = ceph_sb_to_client(dn->d_sb)->mdsc;
1415 spin_lock(&mdsc->dentry_lru_lock);
1416 list_add_tail(&di->lru, &mdsc->dentry_lru);
1418 spin_unlock(&mdsc->dentry_lru_lock);
1421 void ceph_dentry_lru_touch(struct dentry *dn)
1423 struct ceph_dentry_info *di = ceph_dentry(dn);
1424 struct ceph_mds_client *mdsc;
1426 dout("dentry_lru_touch %p %p '%pd' (offset %lld)\n", di, dn, dn,
1428 mdsc = ceph_sb_to_client(dn->d_sb)->mdsc;
1429 spin_lock(&mdsc->dentry_lru_lock);
1430 list_move_tail(&di->lru, &mdsc->dentry_lru);
1431 spin_unlock(&mdsc->dentry_lru_lock);
1434 void ceph_dentry_lru_del(struct dentry *dn)
1436 struct ceph_dentry_info *di = ceph_dentry(dn);
1437 struct ceph_mds_client *mdsc;
1439 dout("dentry_lru_del %p %p '%pd'\n", di, dn, dn);
1440 mdsc = ceph_sb_to_client(dn->d_sb)->mdsc;
1441 spin_lock(&mdsc->dentry_lru_lock);
1442 list_del_init(&di->lru);
1444 spin_unlock(&mdsc->dentry_lru_lock);
1448 * Return name hash for a given dentry. This is dependent on
1449 * the parent directory's hash function.
1451 unsigned ceph_dentry_hash(struct inode *dir, struct dentry *dn)
1453 struct ceph_inode_info *dci = ceph_inode(dir);
1455 switch (dci->i_dir_layout.dl_dir_hash) {
1456 case 0: /* for backward compat */
1457 case CEPH_STR_HASH_LINUX:
1458 return dn->d_name.hash;
1461 return ceph_str_hash(dci->i_dir_layout.dl_dir_hash,
1462 dn->d_name.name, dn->d_name.len);
1466 const struct file_operations ceph_dir_fops = {
1467 .read = ceph_read_dir,
1468 .iterate = ceph_readdir,
1469 .llseek = ceph_dir_llseek,
1471 .release = ceph_release,
1472 .unlocked_ioctl = ceph_ioctl,
1473 .fsync = ceph_fsync,
1476 const struct file_operations ceph_snapdir_fops = {
1477 .iterate = ceph_readdir,
1478 .llseek = ceph_dir_llseek,
1480 .release = ceph_release,
1483 const struct inode_operations ceph_dir_iops = {
1484 .lookup = ceph_lookup,
1485 .permission = ceph_permission,
1486 .getattr = ceph_getattr,
1487 .setattr = ceph_setattr,
1488 .listxattr = ceph_listxattr,
1489 .get_acl = ceph_get_acl,
1490 .set_acl = ceph_set_acl,
1491 .mknod = ceph_mknod,
1492 .symlink = ceph_symlink,
1493 .mkdir = ceph_mkdir,
1495 .unlink = ceph_unlink,
1496 .rmdir = ceph_unlink,
1497 .rename = ceph_rename,
1498 .create = ceph_create,
1499 .atomic_open = ceph_atomic_open,
1502 const struct inode_operations ceph_snapdir_iops = {
1503 .lookup = ceph_lookup,
1504 .permission = ceph_permission,
1505 .getattr = ceph_getattr,
1506 .mkdir = ceph_mkdir,
1507 .rmdir = ceph_unlink,
1508 .rename = ceph_rename,
1511 const struct dentry_operations ceph_dentry_ops = {
1512 .d_revalidate = ceph_d_revalidate,
1513 .d_release = ceph_d_release,
1514 .d_prune = ceph_d_prune,
1515 .d_init = ceph_d_init,