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
,