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>
10 #include "mds_client.h"
13 * Directory operations: readdir, lookup, create, link, unlink,
18 * Ceph MDS operations are specified in terms of a base ino and
19 * relative path. Thus, the client can specify an operation on a
20 * specific inode (e.g., a getattr due to fstat(2)), or as a path
21 * relative to, say, the root directory.
23 * Normally, we limit ourselves to strict inode ops (no path component)
24 * or dentry operations (a single path component relative to an ino). The
25 * exception to this is open_root_dentry(), which will open the mount
29 const struct inode_operations ceph_dir_iops
;
30 const struct file_operations ceph_dir_fops
;
31 const struct dentry_operations ceph_dentry_ops
;
34 * Initialize ceph dentry state.
36 int ceph_init_dentry(struct dentry
*dentry
)
38 struct ceph_dentry_info
*di
;
43 if (dentry
->d_parent
== NULL
|| /* nfs fh_to_dentry */
44 ceph_snap(dentry
->d_parent
->d_inode
) == CEPH_NOSNAP
)
45 dentry
->d_op
= &ceph_dentry_ops
;
46 else if (ceph_snap(dentry
->d_parent
->d_inode
) == CEPH_SNAPDIR
)
47 dentry
->d_op
= &ceph_snapdir_dentry_ops
;
49 dentry
->d_op
= &ceph_snap_dentry_ops
;
51 di
= kmem_cache_alloc(ceph_dentry_cachep
, GFP_NOFS
| __GFP_ZERO
);
53 return -ENOMEM
; /* oh well */
55 spin_lock(&dentry
->d_lock
);
56 if (dentry
->d_fsdata
) {
58 kmem_cache_free(ceph_dentry_cachep
, di
);
62 di
->lease_session
= NULL
;
63 dentry
->d_fsdata
= di
;
64 dentry
->d_time
= jiffies
;
65 ceph_dentry_lru_add(dentry
);
67 spin_unlock(&dentry
->d_lock
);
74 * for readdir, we encode the directory frag and offset within that
77 static unsigned fpos_frag(loff_t p
)
81 static unsigned fpos_off(loff_t p
)
83 return p
& 0xffffffff;
87 * When possible, we try to satisfy a readdir by peeking at the
88 * dcache. We make this work by carefully ordering dentries on
89 * d_u.d_child when we initially get results back from the MDS, and
90 * falling back to a "normal" sync readdir if any dentries in the dir
93 * I_COMPLETE tells indicates we have all dentries in the dir. It is
94 * defined IFF we hold CEPH_CAP_FILE_SHARED (which will be revoked by
95 * the MDS if/when the directory is modified).
97 static int __dcache_readdir(struct file
*filp
,
98 void *dirent
, filldir_t filldir
)
100 struct ceph_file_info
*fi
= filp
->private_data
;
101 struct dentry
*parent
= filp
->f_dentry
;
102 struct inode
*dir
= parent
->d_inode
;
104 struct dentry
*dentry
, *last
;
105 struct ceph_dentry_info
*di
;
108 /* claim ref on last dentry we returned */
112 dout("__dcache_readdir %p at %llu (last %p)\n", dir
, filp
->f_pos
,
115 spin_lock(&dcache_lock
);
116 spin_lock(&parent
->d_lock
);
118 /* start at beginning? */
119 if (filp
->f_pos
== 2 || last
== NULL
||
120 filp
->f_pos
< ceph_dentry(last
)->offset
) {
121 if (list_empty(&parent
->d_subdirs
))
123 p
= parent
->d_subdirs
.prev
;
124 dout(" initial p %p/%p\n", p
->prev
, p
->next
);
126 p
= last
->d_u
.d_child
.prev
;
130 dentry
= list_entry(p
, struct dentry
, d_u
.d_child
);
131 di
= ceph_dentry(dentry
);
133 dout(" p %p/%p %s d_subdirs %p/%p\n", p
->prev
, p
->next
,
134 d_unhashed(dentry
) ? "!hashed" : "hashed",
135 parent
->d_subdirs
.prev
, parent
->d_subdirs
.next
);
136 if (p
== &parent
->d_subdirs
) {
140 spin_lock_nested(&dentry
->d_lock
, DENTRY_D_LOCK_NESTED
);
141 if (!d_unhashed(dentry
) && dentry
->d_inode
&&
142 ceph_snap(dentry
->d_inode
) != CEPH_SNAPDIR
&&
143 ceph_ino(dentry
->d_inode
) != CEPH_INO_CEPH
&&
144 filp
->f_pos
<= di
->offset
)
146 dout(" skipping %p %.*s at %llu (%llu)%s%s\n", dentry
,
147 dentry
->d_name
.len
, dentry
->d_name
.name
, di
->offset
,
148 filp
->f_pos
, d_unhashed(dentry
) ? " unhashed" : "",
149 !dentry
->d_inode
? " null" : "");
150 spin_unlock(&dentry
->d_lock
);
152 dentry
= list_entry(p
, struct dentry
, d_u
.d_child
);
153 di
= ceph_dentry(dentry
);
157 spin_unlock(&dentry
->d_lock
);
158 spin_unlock(&parent
->d_lock
);
159 spin_unlock(&dcache_lock
);
161 dout(" %llu (%llu) dentry %p %.*s %p\n", di
->offset
, filp
->f_pos
,
162 dentry
, dentry
->d_name
.len
, dentry
->d_name
.name
, dentry
->d_inode
);
163 filp
->f_pos
= di
->offset
;
164 err
= filldir(dirent
, dentry
->d_name
.name
,
165 dentry
->d_name
.len
, di
->offset
,
166 dentry
->d_inode
->i_ino
,
167 dentry
->d_inode
->i_mode
>> 12);
171 /* remember our position */
173 fi
->next_offset
= di
->offset
;
185 /* make sure a dentry wasn't dropped while we didn't have dcache_lock */
186 if (!ceph_i_test(dir
, CEPH_I_COMPLETE
)) {
187 dout(" lost I_COMPLETE on %p; falling back to mds\n", dir
);
192 spin_lock(&dcache_lock
);
193 spin_lock(&parent
->d_lock
);
194 p
= p
->prev
; /* advance to next dentry */
198 spin_unlock(&parent
->d_lock
);
199 spin_unlock(&dcache_lock
);
207 * make note of the last dentry we read, so we can
208 * continue at the same lexicographical point,
209 * regardless of what dir changes take place on the
212 static int note_last_dentry(struct ceph_file_info
*fi
, const char *name
,
215 kfree(fi
->last_name
);
216 fi
->last_name
= kmalloc(len
+1, GFP_NOFS
);
219 memcpy(fi
->last_name
, name
, len
);
220 fi
->last_name
[len
] = 0;
221 dout("note_last_dentry '%s'\n", fi
->last_name
);
225 static int ceph_readdir(struct file
*filp
, void *dirent
, filldir_t filldir
)
227 struct ceph_file_info
*fi
= filp
->private_data
;
228 struct inode
*inode
= filp
->f_dentry
->d_inode
;
229 struct ceph_inode_info
*ci
= ceph_inode(inode
);
230 struct ceph_fs_client
*fsc
= ceph_inode_to_client(inode
);
231 struct ceph_mds_client
*mdsc
= fsc
->mdsc
;
232 unsigned frag
= fpos_frag(filp
->f_pos
);
233 int off
= fpos_off(filp
->f_pos
);
236 struct ceph_mds_reply_info_parsed
*rinfo
;
237 const int max_entries
= fsc
->mount_options
->max_readdir
;
238 const int max_bytes
= fsc
->mount_options
->max_readdir_bytes
;
240 dout("readdir %p filp %p frag %u off %u\n", inode
, filp
, frag
, off
);
244 /* always start with . and .. */
245 if (filp
->f_pos
== 0) {
246 /* note dir version at start of readdir so we can tell
247 * if any dentries get dropped */
248 fi
->dir_release_count
= ci
->i_release_count
;
250 dout("readdir off 0 -> '.'\n");
251 if (filldir(dirent
, ".", 1, ceph_make_fpos(0, 0),
252 inode
->i_ino
, inode
->i_mode
>> 12) < 0)
257 if (filp
->f_pos
== 1) {
258 dout("readdir off 1 -> '..'\n");
259 if (filldir(dirent
, "..", 2, ceph_make_fpos(0, 1),
260 filp
->f_dentry
->d_parent
->d_inode
->i_ino
,
261 inode
->i_mode
>> 12) < 0)
267 /* can we use the dcache? */
268 spin_lock(&inode
->i_lock
);
269 if ((filp
->f_pos
== 2 || fi
->dentry
) &&
270 !ceph_test_mount_opt(fsc
, NOASYNCREADDIR
) &&
271 ceph_snap(inode
) != CEPH_SNAPDIR
&&
272 (ci
->i_ceph_flags
& CEPH_I_COMPLETE
) &&
273 __ceph_caps_issued_mask(ci
, CEPH_CAP_FILE_SHARED
, 1)) {
274 spin_unlock(&inode
->i_lock
);
275 err
= __dcache_readdir(filp
, dirent
, filldir
);
279 spin_unlock(&inode
->i_lock
);
282 err
= note_last_dentry(fi
, fi
->dentry
->d_name
.name
,
283 fi
->dentry
->d_name
.len
);
290 /* proceed with a normal readdir */
293 /* do we have the correct frag content buffered? */
294 if (fi
->frag
!= frag
|| fi
->last_readdir
== NULL
) {
295 struct ceph_mds_request
*req
;
296 int op
= ceph_snap(inode
) == CEPH_SNAPDIR
?
297 CEPH_MDS_OP_LSSNAP
: CEPH_MDS_OP_READDIR
;
299 /* discard old result, if any */
300 if (fi
->last_readdir
) {
301 ceph_mdsc_put_request(fi
->last_readdir
);
302 fi
->last_readdir
= NULL
;
305 /* requery frag tree, as the frag topology may have changed */
306 frag
= ceph_choose_frag(ceph_inode(inode
), frag
, NULL
, NULL
);
308 dout("readdir fetching %llx.%llx frag %x offset '%s'\n",
309 ceph_vinop(inode
), frag
, fi
->last_name
);
310 req
= ceph_mdsc_create_request(mdsc
, op
, USE_AUTH_MDS
);
313 req
->r_inode
= igrab(inode
);
314 req
->r_dentry
= dget(filp
->f_dentry
);
315 /* hints to request -> mds selection code */
316 req
->r_direct_mode
= USE_AUTH_MDS
;
317 req
->r_direct_hash
= ceph_frag_value(frag
);
318 req
->r_direct_is_hash
= true;
319 req
->r_path2
= kstrdup(fi
->last_name
, GFP_NOFS
);
320 req
->r_readdir_offset
= fi
->next_offset
;
321 req
->r_args
.readdir
.frag
= cpu_to_le32(frag
);
322 req
->r_args
.readdir
.max_entries
= cpu_to_le32(max_entries
);
323 req
->r_args
.readdir
.max_bytes
= cpu_to_le32(max_bytes
);
324 req
->r_num_caps
= max_entries
+ 1;
325 err
= ceph_mdsc_do_request(mdsc
, NULL
, req
);
327 ceph_mdsc_put_request(req
);
330 dout("readdir got and parsed readdir result=%d"
331 " on frag %x, end=%d, complete=%d\n", err
, frag
,
332 (int)req
->r_reply_info
.dir_end
,
333 (int)req
->r_reply_info
.dir_complete
);
335 if (!req
->r_did_prepopulate
) {
336 dout("readdir !did_prepopulate");
337 fi
->dir_release_count
--; /* preclude I_COMPLETE */
340 /* note next offset and last dentry name */
341 fi
->offset
= fi
->next_offset
;
342 fi
->last_readdir
= req
;
344 if (req
->r_reply_info
.dir_end
) {
345 kfree(fi
->last_name
);
346 fi
->last_name
= NULL
;
347 if (ceph_frag_is_rightmost(frag
))
352 rinfo
= &req
->r_reply_info
;
353 err
= note_last_dentry(fi
,
354 rinfo
->dir_dname
[rinfo
->dir_nr
-1],
355 rinfo
->dir_dname_len
[rinfo
->dir_nr
-1]);
358 fi
->next_offset
+= rinfo
->dir_nr
;
362 rinfo
= &fi
->last_readdir
->r_reply_info
;
363 dout("readdir frag %x num %d off %d chunkoff %d\n", frag
,
364 rinfo
->dir_nr
, off
, fi
->offset
);
365 while (off
- fi
->offset
>= 0 && off
- fi
->offset
< rinfo
->dir_nr
) {
366 u64 pos
= ceph_make_fpos(frag
, off
);
367 struct ceph_mds_reply_inode
*in
=
368 rinfo
->dir_in
[off
- fi
->offset
].in
;
369 struct ceph_vino vino
;
372 dout("readdir off %d (%d/%d) -> %lld '%.*s' %p\n",
373 off
, off
- fi
->offset
, rinfo
->dir_nr
, pos
,
374 rinfo
->dir_dname_len
[off
- fi
->offset
],
375 rinfo
->dir_dname
[off
- fi
->offset
], in
);
377 ftype
= le32_to_cpu(in
->mode
) >> 12;
378 vino
.ino
= le64_to_cpu(in
->ino
);
379 vino
.snap
= le64_to_cpu(in
->snapid
);
380 ino
= ceph_vino_to_ino(vino
);
382 rinfo
->dir_dname
[off
- fi
->offset
],
383 rinfo
->dir_dname_len
[off
- fi
->offset
],
384 pos
, ino
, ftype
) < 0) {
385 dout("filldir stopping us...\n");
389 filp
->f_pos
= pos
+ 1;
393 ceph_mdsc_put_request(fi
->last_readdir
);
394 fi
->last_readdir
= NULL
;
399 if (!ceph_frag_is_rightmost(frag
)) {
400 frag
= ceph_frag_next(frag
);
402 filp
->f_pos
= ceph_make_fpos(frag
, off
);
403 dout("readdir next frag is %x\n", frag
);
409 * if dir_release_count still matches the dir, no dentries
410 * were released during the whole readdir, and we should have
411 * the complete dir contents in our cache.
413 spin_lock(&inode
->i_lock
);
414 if (ci
->i_release_count
== fi
->dir_release_count
) {
415 dout(" marking %p complete\n", inode
);
416 ci
->i_ceph_flags
|= CEPH_I_COMPLETE
;
417 ci
->i_max_offset
= filp
->f_pos
;
419 spin_unlock(&inode
->i_lock
);
421 dout("readdir %p filp %p done.\n", inode
, filp
);
425 static void reset_readdir(struct ceph_file_info
*fi
)
427 if (fi
->last_readdir
) {
428 ceph_mdsc_put_request(fi
->last_readdir
);
429 fi
->last_readdir
= NULL
;
431 kfree(fi
->last_name
);
432 fi
->last_name
= NULL
;
433 fi
->next_offset
= 2; /* compensate for . and .. */
441 static loff_t
ceph_dir_llseek(struct file
*file
, loff_t offset
, int origin
)
443 struct ceph_file_info
*fi
= file
->private_data
;
444 struct inode
*inode
= file
->f_mapping
->host
;
445 loff_t old_offset
= offset
;
448 mutex_lock(&inode
->i_mutex
);
451 offset
+= inode
->i_size
+ 2; /* FIXME */
454 offset
+= file
->f_pos
;
457 if (offset
>= 0 && offset
<= inode
->i_sb
->s_maxbytes
) {
458 if (offset
!= file
->f_pos
) {
459 file
->f_pos
= offset
;
466 * discard buffered readdir content on seekdir(0), or
467 * seek to new frag, or seek prior to current chunk.
470 fpos_frag(offset
) != fpos_frag(old_offset
) ||
471 fpos_off(offset
) < fi
->offset
) {
472 dout("dir_llseek dropping %p content\n", file
);
476 /* bump dir_release_count if we did a forward seek */
477 if (offset
> old_offset
)
478 fi
->dir_release_count
--;
480 mutex_unlock(&inode
->i_mutex
);
485 * Process result of a lookup/open request.
487 * Mainly, make sure we return the final req->r_dentry (if it already
488 * existed) in place of the original VFS-provided dentry when they
491 * Gracefully handle the case where the MDS replies with -ENOENT and
492 * no trace (which it may do, at its discretion, e.g., if it doesn't
493 * care to issue a lease on the negative dentry).
495 struct dentry
*ceph_finish_lookup(struct ceph_mds_request
*req
,
496 struct dentry
*dentry
, int err
)
498 struct ceph_fs_client
*fsc
= ceph_sb_to_client(dentry
->d_sb
);
499 struct inode
*parent
= dentry
->d_parent
->d_inode
;
502 if (err
== -ENOENT
&&
503 strcmp(dentry
->d_name
.name
,
504 fsc
->mount_options
->snapdir_name
) == 0) {
505 struct inode
*inode
= ceph_get_snapdir(parent
);
506 dout("ENOENT on snapdir %p '%.*s', linking to snapdir %p\n",
507 dentry
, dentry
->d_name
.len
, dentry
->d_name
.name
, inode
);
508 BUG_ON(!d_unhashed(dentry
));
509 d_add(dentry
, inode
);
513 if (err
== -ENOENT
) {
516 if (!req
->r_reply_info
.head
->is_dentry
) {
517 dout("ENOENT and no trace, dentry %p inode %p\n",
518 dentry
, dentry
->d_inode
);
519 if (dentry
->d_inode
) {
528 dentry
= ERR_PTR(err
);
529 else if (dentry
!= req
->r_dentry
)
530 dentry
= dget(req
->r_dentry
); /* we got spliced */
536 static int is_root_ceph_dentry(struct inode
*inode
, struct dentry
*dentry
)
538 return ceph_ino(inode
) == CEPH_INO_ROOT
&&
539 strncmp(dentry
->d_name
.name
, ".ceph", 5) == 0;
543 * Look up a single dir entry. If there is a lookup intent, inform
544 * the MDS so that it gets our 'caps wanted' value in a single op.
546 static struct dentry
*ceph_lookup(struct inode
*dir
, struct dentry
*dentry
,
547 struct nameidata
*nd
)
549 struct ceph_fs_client
*fsc
= ceph_sb_to_client(dir
->i_sb
);
550 struct ceph_mds_client
*mdsc
= fsc
->mdsc
;
551 struct ceph_mds_request
*req
;
555 dout("lookup %p dentry %p '%.*s'\n",
556 dir
, dentry
, dentry
->d_name
.len
, dentry
->d_name
.name
);
558 if (dentry
->d_name
.len
> NAME_MAX
)
559 return ERR_PTR(-ENAMETOOLONG
);
561 err
= ceph_init_dentry(dentry
);
565 /* open (but not create!) intent? */
567 (nd
->flags
& LOOKUP_OPEN
) &&
568 (nd
->flags
& LOOKUP_CONTINUE
) == 0 && /* only open last component */
569 !(nd
->intent
.open
.flags
& O_CREAT
)) {
570 int mode
= nd
->intent
.open
.create_mode
& ~current
->fs
->umask
;
571 return ceph_lookup_open(dir
, dentry
, nd
, mode
, 1);
574 /* can we conclude ENOENT locally? */
575 if (dentry
->d_inode
== NULL
) {
576 struct ceph_inode_info
*ci
= ceph_inode(dir
);
577 struct ceph_dentry_info
*di
= ceph_dentry(dentry
);
579 spin_lock(&dir
->i_lock
);
580 dout(" dir %p flags are %d\n", dir
, ci
->i_ceph_flags
);
581 if (strncmp(dentry
->d_name
.name
,
582 fsc
->mount_options
->snapdir_name
,
583 dentry
->d_name
.len
) &&
584 !is_root_ceph_dentry(dir
, dentry
) &&
585 (ci
->i_ceph_flags
& CEPH_I_COMPLETE
) &&
586 (__ceph_caps_issued_mask(ci
, CEPH_CAP_FILE_SHARED
, 1))) {
587 spin_unlock(&dir
->i_lock
);
588 dout(" dir %p complete, -ENOENT\n", dir
);
590 di
->lease_shared_gen
= ci
->i_shared_gen
;
593 spin_unlock(&dir
->i_lock
);
596 op
= ceph_snap(dir
) == CEPH_SNAPDIR
?
597 CEPH_MDS_OP_LOOKUPSNAP
: CEPH_MDS_OP_LOOKUP
;
598 req
= ceph_mdsc_create_request(mdsc
, op
, USE_ANY_MDS
);
600 return ERR_CAST(req
);
601 req
->r_dentry
= dget(dentry
);
603 /* we only need inode linkage */
604 req
->r_args
.getattr
.mask
= cpu_to_le32(CEPH_STAT_CAP_INODE
);
605 req
->r_locked_dir
= dir
;
606 err
= ceph_mdsc_do_request(mdsc
, NULL
, req
);
607 dentry
= ceph_finish_lookup(req
, dentry
, err
);
608 ceph_mdsc_put_request(req
); /* will dput(dentry) */
609 dout("lookup result=%p\n", dentry
);
614 * If we do a create but get no trace back from the MDS, follow up with
615 * a lookup (the VFS expects us to link up the provided dentry).
617 int ceph_handle_notrace_create(struct inode
*dir
, struct dentry
*dentry
)
619 struct dentry
*result
= ceph_lookup(dir
, dentry
, NULL
);
621 if (result
&& !IS_ERR(result
)) {
623 * We created the item, then did a lookup, and found
624 * it was already linked to another inode we already
625 * had in our cache (and thus got spliced). Link our
626 * dentry to that inode, but don't hash it, just in
627 * case the VFS wants to dereference it.
629 BUG_ON(!result
->d_inode
);
630 d_instantiate(dentry
, result
->d_inode
);
633 return PTR_ERR(result
);
636 static int ceph_mknod(struct inode
*dir
, struct dentry
*dentry
,
637 int mode
, dev_t rdev
)
639 struct ceph_fs_client
*fsc
= ceph_sb_to_client(dir
->i_sb
);
640 struct ceph_mds_client
*mdsc
= fsc
->mdsc
;
641 struct ceph_mds_request
*req
;
644 if (ceph_snap(dir
) != CEPH_NOSNAP
)
647 dout("mknod in dir %p dentry %p mode 0%o rdev %d\n",
648 dir
, dentry
, mode
, rdev
);
649 req
= ceph_mdsc_create_request(mdsc
, CEPH_MDS_OP_MKNOD
, USE_AUTH_MDS
);
654 req
->r_dentry
= dget(dentry
);
656 req
->r_locked_dir
= dir
;
657 req
->r_args
.mknod
.mode
= cpu_to_le32(mode
);
658 req
->r_args
.mknod
.rdev
= cpu_to_le32(rdev
);
659 req
->r_dentry_drop
= CEPH_CAP_FILE_SHARED
;
660 req
->r_dentry_unless
= CEPH_CAP_FILE_EXCL
;
661 err
= ceph_mdsc_do_request(mdsc
, dir
, req
);
662 if (!err
&& !req
->r_reply_info
.head
->is_dentry
)
663 err
= ceph_handle_notrace_create(dir
, dentry
);
664 ceph_mdsc_put_request(req
);
670 static int ceph_create(struct inode
*dir
, struct dentry
*dentry
, int mode
,
671 struct nameidata
*nd
)
673 dout("create in dir %p dentry %p name '%.*s'\n",
674 dir
, dentry
, dentry
->d_name
.len
, dentry
->d_name
.name
);
676 if (ceph_snap(dir
) != CEPH_NOSNAP
)
680 BUG_ON((nd
->flags
& LOOKUP_OPEN
) == 0);
681 dentry
= ceph_lookup_open(dir
, dentry
, nd
, mode
, 0);
682 /* hrm, what should i do here if we get aliased? */
684 return PTR_ERR(dentry
);
688 /* fall back to mknod */
689 return ceph_mknod(dir
, dentry
, (mode
& ~S_IFMT
) | S_IFREG
, 0);
692 static int ceph_symlink(struct inode
*dir
, struct dentry
*dentry
,
695 struct ceph_fs_client
*fsc
= ceph_sb_to_client(dir
->i_sb
);
696 struct ceph_mds_client
*mdsc
= fsc
->mdsc
;
697 struct ceph_mds_request
*req
;
700 if (ceph_snap(dir
) != CEPH_NOSNAP
)
703 dout("symlink in dir %p dentry %p to '%s'\n", dir
, dentry
, dest
);
704 req
= ceph_mdsc_create_request(mdsc
, CEPH_MDS_OP_SYMLINK
, USE_AUTH_MDS
);
709 req
->r_dentry
= dget(dentry
);
711 req
->r_path2
= kstrdup(dest
, GFP_NOFS
);
712 req
->r_locked_dir
= dir
;
713 req
->r_dentry_drop
= CEPH_CAP_FILE_SHARED
;
714 req
->r_dentry_unless
= CEPH_CAP_FILE_EXCL
;
715 err
= ceph_mdsc_do_request(mdsc
, dir
, req
);
716 if (!err
&& !req
->r_reply_info
.head
->is_dentry
)
717 err
= ceph_handle_notrace_create(dir
, dentry
);
718 ceph_mdsc_put_request(req
);
724 static int ceph_mkdir(struct inode
*dir
, struct dentry
*dentry
, int mode
)
726 struct ceph_fs_client
*fsc
= ceph_sb_to_client(dir
->i_sb
);
727 struct ceph_mds_client
*mdsc
= fsc
->mdsc
;
728 struct ceph_mds_request
*req
;
732 if (ceph_snap(dir
) == CEPH_SNAPDIR
) {
733 /* mkdir .snap/foo is a MKSNAP */
734 op
= CEPH_MDS_OP_MKSNAP
;
735 dout("mksnap dir %p snap '%.*s' dn %p\n", dir
,
736 dentry
->d_name
.len
, dentry
->d_name
.name
, dentry
);
737 } else if (ceph_snap(dir
) == CEPH_NOSNAP
) {
738 dout("mkdir dir %p dn %p mode 0%o\n", dir
, dentry
, mode
);
739 op
= CEPH_MDS_OP_MKDIR
;
743 req
= ceph_mdsc_create_request(mdsc
, op
, USE_AUTH_MDS
);
749 req
->r_dentry
= dget(dentry
);
751 req
->r_locked_dir
= dir
;
752 req
->r_args
.mkdir
.mode
= cpu_to_le32(mode
);
753 req
->r_dentry_drop
= CEPH_CAP_FILE_SHARED
;
754 req
->r_dentry_unless
= CEPH_CAP_FILE_EXCL
;
755 err
= ceph_mdsc_do_request(mdsc
, dir
, req
);
756 if (!err
&& !req
->r_reply_info
.head
->is_dentry
)
757 err
= ceph_handle_notrace_create(dir
, dentry
);
758 ceph_mdsc_put_request(req
);
765 static int ceph_link(struct dentry
*old_dentry
, struct inode
*dir
,
766 struct dentry
*dentry
)
768 struct ceph_fs_client
*fsc
= ceph_sb_to_client(dir
->i_sb
);
769 struct ceph_mds_client
*mdsc
= fsc
->mdsc
;
770 struct ceph_mds_request
*req
;
773 if (ceph_snap(dir
) != CEPH_NOSNAP
)
776 dout("link in dir %p old_dentry %p dentry %p\n", dir
,
778 req
= ceph_mdsc_create_request(mdsc
, CEPH_MDS_OP_LINK
, USE_AUTH_MDS
);
783 req
->r_dentry
= dget(dentry
);
785 req
->r_old_dentry
= dget(old_dentry
); /* or inode? hrm. */
786 req
->r_locked_dir
= dir
;
787 req
->r_dentry_drop
= CEPH_CAP_FILE_SHARED
;
788 req
->r_dentry_unless
= CEPH_CAP_FILE_EXCL
;
789 err
= ceph_mdsc_do_request(mdsc
, dir
, req
);
792 else if (!req
->r_reply_info
.head
->is_dentry
)
793 d_instantiate(dentry
, igrab(old_dentry
->d_inode
));
794 ceph_mdsc_put_request(req
);
799 * For a soon-to-be unlinked file, drop the AUTH_RDCACHE caps. If it
800 * looks like the link count will hit 0, drop any other caps (other
801 * than PIN) we don't specifically want (due to the file still being
804 static int drop_caps_for_unlink(struct inode
*inode
)
806 struct ceph_inode_info
*ci
= ceph_inode(inode
);
807 int drop
= CEPH_CAP_LINK_SHARED
| CEPH_CAP_LINK_EXCL
;
809 spin_lock(&inode
->i_lock
);
810 if (inode
->i_nlink
== 1) {
811 drop
|= ~(__ceph_caps_wanted(ci
) | CEPH_CAP_PIN
);
812 ci
->i_ceph_flags
|= CEPH_I_NODELAY
;
814 spin_unlock(&inode
->i_lock
);
819 * rmdir and unlink are differ only by the metadata op code
821 static int ceph_unlink(struct inode
*dir
, struct dentry
*dentry
)
823 struct ceph_fs_client
*fsc
= ceph_sb_to_client(dir
->i_sb
);
824 struct ceph_mds_client
*mdsc
= fsc
->mdsc
;
825 struct inode
*inode
= dentry
->d_inode
;
826 struct ceph_mds_request
*req
;
830 if (ceph_snap(dir
) == CEPH_SNAPDIR
) {
831 /* rmdir .snap/foo is RMSNAP */
832 dout("rmsnap dir %p '%.*s' dn %p\n", dir
, dentry
->d_name
.len
,
833 dentry
->d_name
.name
, dentry
);
834 op
= CEPH_MDS_OP_RMSNAP
;
835 } else if (ceph_snap(dir
) == CEPH_NOSNAP
) {
836 dout("unlink/rmdir dir %p dn %p inode %p\n",
838 op
= ((dentry
->d_inode
->i_mode
& S_IFMT
) == S_IFDIR
) ?
839 CEPH_MDS_OP_RMDIR
: CEPH_MDS_OP_UNLINK
;
842 req
= ceph_mdsc_create_request(mdsc
, op
, USE_AUTH_MDS
);
847 req
->r_dentry
= dget(dentry
);
849 req
->r_locked_dir
= dir
;
850 req
->r_dentry_drop
= CEPH_CAP_FILE_SHARED
;
851 req
->r_dentry_unless
= CEPH_CAP_FILE_EXCL
;
852 req
->r_inode_drop
= drop_caps_for_unlink(inode
);
853 err
= ceph_mdsc_do_request(mdsc
, dir
, req
);
854 if (!err
&& !req
->r_reply_info
.head
->is_dentry
)
856 ceph_mdsc_put_request(req
);
861 static int ceph_rename(struct inode
*old_dir
, struct dentry
*old_dentry
,
862 struct inode
*new_dir
, struct dentry
*new_dentry
)
864 struct ceph_fs_client
*fsc
= ceph_sb_to_client(old_dir
->i_sb
);
865 struct ceph_mds_client
*mdsc
= fsc
->mdsc
;
866 struct ceph_mds_request
*req
;
869 if (ceph_snap(old_dir
) != ceph_snap(new_dir
))
871 if (ceph_snap(old_dir
) != CEPH_NOSNAP
||
872 ceph_snap(new_dir
) != CEPH_NOSNAP
)
874 dout("rename dir %p dentry %p to dir %p dentry %p\n",
875 old_dir
, old_dentry
, new_dir
, new_dentry
);
876 req
= ceph_mdsc_create_request(mdsc
, CEPH_MDS_OP_RENAME
, USE_AUTH_MDS
);
879 req
->r_dentry
= dget(new_dentry
);
881 req
->r_old_dentry
= dget(old_dentry
);
882 req
->r_locked_dir
= new_dir
;
883 req
->r_old_dentry_drop
= CEPH_CAP_FILE_SHARED
;
884 req
->r_old_dentry_unless
= CEPH_CAP_FILE_EXCL
;
885 req
->r_dentry_drop
= CEPH_CAP_FILE_SHARED
;
886 req
->r_dentry_unless
= CEPH_CAP_FILE_EXCL
;
887 /* release LINK_RDCACHE on source inode (mds will lock it) */
888 req
->r_old_inode_drop
= CEPH_CAP_LINK_SHARED
;
889 if (new_dentry
->d_inode
)
890 req
->r_inode_drop
= drop_caps_for_unlink(new_dentry
->d_inode
);
891 err
= ceph_mdsc_do_request(mdsc
, old_dir
, req
);
892 if (!err
&& !req
->r_reply_info
.head
->is_dentry
) {
894 * Normally d_move() is done by fill_trace (called by
895 * do_request, above). If there is no trace, we need
899 /* d_move screws up d_subdirs order */
900 ceph_i_clear(new_dir
, CEPH_I_COMPLETE
);
902 d_move(old_dentry
, new_dentry
);
904 /* ensure target dentry is invalidated, despite
905 rehashing bug in vfs_rename_dir */
906 ceph_invalidate_dentry_lease(new_dentry
);
908 ceph_mdsc_put_request(req
);
913 * Ensure a dentry lease will no longer revalidate.
915 void ceph_invalidate_dentry_lease(struct dentry
*dentry
)
917 spin_lock(&dentry
->d_lock
);
918 dentry
->d_time
= jiffies
;
919 ceph_dentry(dentry
)->lease_shared_gen
= 0;
920 spin_unlock(&dentry
->d_lock
);
924 * Check if dentry lease is valid. If not, delete the lease. Try to
925 * renew if the least is more than half up.
927 static int dentry_lease_is_valid(struct dentry
*dentry
)
929 struct ceph_dentry_info
*di
;
930 struct ceph_mds_session
*s
;
934 struct ceph_mds_session
*session
= NULL
;
935 struct inode
*dir
= NULL
;
938 spin_lock(&dentry
->d_lock
);
939 di
= ceph_dentry(dentry
);
940 if (di
&& di
->lease_session
) {
941 s
= di
->lease_session
;
942 spin_lock(&s
->s_cap_lock
);
945 spin_unlock(&s
->s_cap_lock
);
947 if (di
->lease_gen
== gen
&&
948 time_before(jiffies
, dentry
->d_time
) &&
949 time_before(jiffies
, ttl
)) {
951 if (di
->lease_renew_after
&&
952 time_after(jiffies
, di
->lease_renew_after
)) {
953 /* we should renew */
954 dir
= dentry
->d_parent
->d_inode
;
955 session
= ceph_get_mds_session(s
);
957 di
->lease_renew_after
= 0;
958 di
->lease_renew_from
= jiffies
;
962 spin_unlock(&dentry
->d_lock
);
965 ceph_mdsc_lease_send_msg(session
, dir
, dentry
,
966 CEPH_MDS_LEASE_RENEW
, seq
);
967 ceph_put_mds_session(session
);
969 dout("dentry_lease_is_valid - dentry %p = %d\n", dentry
, valid
);
974 * Check if directory-wide content lease/cap is valid.
976 static int dir_lease_is_valid(struct inode
*dir
, struct dentry
*dentry
)
978 struct ceph_inode_info
*ci
= ceph_inode(dir
);
979 struct ceph_dentry_info
*di
= ceph_dentry(dentry
);
982 spin_lock(&dir
->i_lock
);
983 if (ci
->i_shared_gen
== di
->lease_shared_gen
)
984 valid
= __ceph_caps_issued_mask(ci
, CEPH_CAP_FILE_SHARED
, 1);
985 spin_unlock(&dir
->i_lock
);
986 dout("dir_lease_is_valid dir %p v%u dentry %p v%u = %d\n",
987 dir
, (unsigned)ci
->i_shared_gen
, dentry
,
988 (unsigned)di
->lease_shared_gen
, valid
);
993 * Check if cached dentry can be trusted.
995 static int ceph_d_revalidate(struct dentry
*dentry
, struct nameidata
*nd
)
997 struct inode
*dir
= dentry
->d_parent
->d_inode
;
999 dout("d_revalidate %p '%.*s' inode %p offset %lld\n", dentry
,
1000 dentry
->d_name
.len
, dentry
->d_name
.name
, dentry
->d_inode
,
1001 ceph_dentry(dentry
)->offset
);
1003 /* always trust cached snapped dentries, snapdir dentry */
1004 if (ceph_snap(dir
) != CEPH_NOSNAP
) {
1005 dout("d_revalidate %p '%.*s' inode %p is SNAPPED\n", dentry
,
1006 dentry
->d_name
.len
, dentry
->d_name
.name
, dentry
->d_inode
);
1009 if (dentry
->d_inode
&& ceph_snap(dentry
->d_inode
) == CEPH_SNAPDIR
)
1012 if (dentry_lease_is_valid(dentry
) ||
1013 dir_lease_is_valid(dir
, dentry
))
1016 dout("d_revalidate %p invalid\n", dentry
);
1020 ceph_dentry_lru_touch(dentry
);
1025 * When a dentry is released, clear the dir I_COMPLETE if it was part
1026 * of the current dir gen or if this is in the snapshot namespace.
1028 static void ceph_dentry_release(struct dentry
*dentry
)
1030 struct ceph_dentry_info
*di
= ceph_dentry(dentry
);
1031 struct inode
*parent_inode
= NULL
;
1032 u64 snapid
= CEPH_NOSNAP
;
1034 if (!IS_ROOT(dentry
)) {
1035 parent_inode
= dentry
->d_parent
->d_inode
;
1037 snapid
= ceph_snap(parent_inode
);
1039 dout("dentry_release %p parent %p\n", dentry
, parent_inode
);
1040 if (parent_inode
&& snapid
!= CEPH_SNAPDIR
) {
1041 struct ceph_inode_info
*ci
= ceph_inode(parent_inode
);
1043 spin_lock(&parent_inode
->i_lock
);
1044 if (ci
->i_shared_gen
== di
->lease_shared_gen
||
1045 snapid
<= CEPH_MAXSNAP
) {
1046 dout(" clearing %p complete (d_release)\n",
1048 ci
->i_ceph_flags
&= ~CEPH_I_COMPLETE
;
1049 ci
->i_release_count
++;
1051 spin_unlock(&parent_inode
->i_lock
);
1054 ceph_dentry_lru_del(dentry
);
1055 if (di
->lease_session
)
1056 ceph_put_mds_session(di
->lease_session
);
1057 kmem_cache_free(ceph_dentry_cachep
, di
);
1058 dentry
->d_fsdata
= NULL
;
1062 static int ceph_snapdir_d_revalidate(struct dentry
*dentry
,
1063 struct nameidata
*nd
)
1066 * Eventually, we'll want to revalidate snapped metadata
1067 * too... probably...
1075 * read() on a dir. This weird interface hack only works if mounted
1076 * with '-o dirstat'.
1078 static ssize_t
ceph_read_dir(struct file
*file
, char __user
*buf
, size_t size
,
1081 struct ceph_file_info
*cf
= file
->private_data
;
1082 struct inode
*inode
= file
->f_dentry
->d_inode
;
1083 struct ceph_inode_info
*ci
= ceph_inode(inode
);
1086 if (!ceph_test_mount_opt(ceph_sb_to_client(inode
->i_sb
), DIRSTAT
))
1089 if (!cf
->dir_info
) {
1090 cf
->dir_info
= kmalloc(1024, GFP_NOFS
);
1094 sprintf(cf
->dir_info
,
1097 " subdirs: %20lld\n"
1098 "rentries: %20lld\n"
1100 " rsubdirs: %20lld\n"
1102 "rctime: %10ld.%09ld\n",
1103 ci
->i_files
+ ci
->i_subdirs
,
1106 ci
->i_rfiles
+ ci
->i_rsubdirs
,
1110 (long)ci
->i_rctime
.tv_sec
,
1111 (long)ci
->i_rctime
.tv_nsec
);
1114 if (*ppos
>= cf
->dir_info_len
)
1116 size
= min_t(unsigned, size
, cf
->dir_info_len
-*ppos
);
1117 left
= copy_to_user(buf
, cf
->dir_info
+ *ppos
, size
);
1120 *ppos
+= (size
- left
);
1125 * an fsync() on a dir will wait for any uncommitted directory
1126 * operations to commit.
1128 static int ceph_dir_fsync(struct file
*file
, int datasync
)
1130 struct inode
*inode
= file
->f_path
.dentry
->d_inode
;
1131 struct ceph_inode_info
*ci
= ceph_inode(inode
);
1132 struct list_head
*head
= &ci
->i_unsafe_dirops
;
1133 struct ceph_mds_request
*req
;
1137 dout("dir_fsync %p\n", inode
);
1138 spin_lock(&ci
->i_unsafe_lock
);
1139 if (list_empty(head
))
1142 req
= list_entry(head
->prev
,
1143 struct ceph_mds_request
, r_unsafe_dir_item
);
1144 last_tid
= req
->r_tid
;
1147 ceph_mdsc_get_request(req
);
1148 spin_unlock(&ci
->i_unsafe_lock
);
1149 dout("dir_fsync %p wait on tid %llu (until %llu)\n",
1150 inode
, req
->r_tid
, last_tid
);
1151 if (req
->r_timeout
) {
1152 ret
= wait_for_completion_timeout(
1153 &req
->r_safe_completion
, req
->r_timeout
);
1157 ret
= -EIO
; /* timed out */
1159 wait_for_completion(&req
->r_safe_completion
);
1161 spin_lock(&ci
->i_unsafe_lock
);
1162 ceph_mdsc_put_request(req
);
1164 if (ret
|| list_empty(head
))
1166 req
= list_entry(head
->next
,
1167 struct ceph_mds_request
, r_unsafe_dir_item
);
1168 } while (req
->r_tid
< last_tid
);
1170 spin_unlock(&ci
->i_unsafe_lock
);
1175 * We maintain a private dentry LRU.
1177 * FIXME: this needs to be changed to a per-mds lru to be useful.
1179 void ceph_dentry_lru_add(struct dentry
*dn
)
1181 struct ceph_dentry_info
*di
= ceph_dentry(dn
);
1182 struct ceph_mds_client
*mdsc
;
1184 dout("dentry_lru_add %p %p '%.*s'\n", di
, dn
,
1185 dn
->d_name
.len
, dn
->d_name
.name
);
1187 mdsc
= ceph_sb_to_client(dn
->d_sb
)->mdsc
;
1188 spin_lock(&mdsc
->dentry_lru_lock
);
1189 list_add_tail(&di
->lru
, &mdsc
->dentry_lru
);
1191 spin_unlock(&mdsc
->dentry_lru_lock
);
1195 void ceph_dentry_lru_touch(struct dentry
*dn
)
1197 struct ceph_dentry_info
*di
= ceph_dentry(dn
);
1198 struct ceph_mds_client
*mdsc
;
1200 dout("dentry_lru_touch %p %p '%.*s' (offset %lld)\n", di
, dn
,
1201 dn
->d_name
.len
, dn
->d_name
.name
, di
->offset
);
1203 mdsc
= ceph_sb_to_client(dn
->d_sb
)->mdsc
;
1204 spin_lock(&mdsc
->dentry_lru_lock
);
1205 list_move_tail(&di
->lru
, &mdsc
->dentry_lru
);
1206 spin_unlock(&mdsc
->dentry_lru_lock
);
1210 void ceph_dentry_lru_del(struct dentry
*dn
)
1212 struct ceph_dentry_info
*di
= ceph_dentry(dn
);
1213 struct ceph_mds_client
*mdsc
;
1215 dout("dentry_lru_del %p %p '%.*s'\n", di
, dn
,
1216 dn
->d_name
.len
, dn
->d_name
.name
);
1218 mdsc
= ceph_sb_to_client(dn
->d_sb
)->mdsc
;
1219 spin_lock(&mdsc
->dentry_lru_lock
);
1220 list_del_init(&di
->lru
);
1222 spin_unlock(&mdsc
->dentry_lru_lock
);
1226 const struct file_operations ceph_dir_fops
= {
1227 .read
= ceph_read_dir
,
1228 .readdir
= ceph_readdir
,
1229 .llseek
= ceph_dir_llseek
,
1231 .release
= ceph_release
,
1232 .unlocked_ioctl
= ceph_ioctl
,
1233 .fsync
= ceph_dir_fsync
,
1236 const struct inode_operations ceph_dir_iops
= {
1237 .lookup
= ceph_lookup
,
1238 .permission
= ceph_permission
,
1239 .getattr
= ceph_getattr
,
1240 .setattr
= ceph_setattr
,
1241 .setxattr
= ceph_setxattr
,
1242 .getxattr
= ceph_getxattr
,
1243 .listxattr
= ceph_listxattr
,
1244 .removexattr
= ceph_removexattr
,
1245 .mknod
= ceph_mknod
,
1246 .symlink
= ceph_symlink
,
1247 .mkdir
= ceph_mkdir
,
1249 .unlink
= ceph_unlink
,
1250 .rmdir
= ceph_unlink
,
1251 .rename
= ceph_rename
,
1252 .create
= ceph_create
,
1255 const struct dentry_operations ceph_dentry_ops
= {
1256 .d_revalidate
= ceph_d_revalidate
,
1257 .d_release
= ceph_dentry_release
,
1260 const struct dentry_operations ceph_snapdir_dentry_ops
= {
1261 .d_revalidate
= ceph_snapdir_d_revalidate
,
1262 .d_release
= ceph_dentry_release
,
1265 const struct dentry_operations ceph_snap_dentry_ops
= {
1266 .d_release
= ceph_dentry_release
,