1 #include "ceph_debug.h"
3 #include <linux/spinlock.h>
4 #include <linux/fs_struct.h>
5 #include <linux/namei.h>
6 #include <linux/sched.h>
11 * Directory operations: readdir, lookup, create, link, unlink,
16 * Ceph MDS operations are specified in terms of a base ino and
17 * relative path. Thus, the client can specify an operation on a
18 * specific inode (e.g., a getattr due to fstat(2)), or as a path
19 * relative to, say, the root directory.
21 * Normally, we limit ourselves to strict inode ops (no path component)
22 * or dentry operations (a single path component relative to an ino). The
23 * exception to this is open_root_dentry(), which will open the mount
27 const struct inode_operations ceph_dir_iops
;
28 const struct file_operations ceph_dir_fops
;
29 struct dentry_operations ceph_dentry_ops
;
32 * Initialize ceph dentry state.
34 int ceph_init_dentry(struct dentry
*dentry
)
36 struct ceph_dentry_info
*di
;
41 if (ceph_snap(dentry
->d_parent
->d_inode
) == CEPH_NOSNAP
)
42 dentry
->d_op
= &ceph_dentry_ops
;
43 else if (ceph_snap(dentry
->d_parent
->d_inode
) == CEPH_SNAPDIR
)
44 dentry
->d_op
= &ceph_snapdir_dentry_ops
;
46 dentry
->d_op
= &ceph_snap_dentry_ops
;
48 di
= kmem_cache_alloc(ceph_dentry_cachep
, GFP_NOFS
);
50 return -ENOMEM
; /* oh well */
52 spin_lock(&dentry
->d_lock
);
53 if (dentry
->d_fsdata
) /* lost a race */
56 di
->lease_session
= NULL
;
57 dentry
->d_fsdata
= di
;
58 dentry
->d_time
= jiffies
;
59 ceph_dentry_lru_add(dentry
);
61 spin_unlock(&dentry
->d_lock
);
68 * for readdir, we encode the directory frag and offset within that
71 static unsigned fpos_frag(loff_t p
)
75 static unsigned fpos_off(loff_t p
)
77 return p
& 0xffffffff;
81 * When possible, we try to satisfy a readdir by peeking at the
82 * dcache. We make this work by carefully ordering dentries on
83 * d_u.d_child when we initially get results back from the MDS, and
84 * falling back to a "normal" sync readdir if any dentries in the dir
87 * I_COMPLETE tells indicates we have all dentries in the dir. It is
88 * defined IFF we hold CEPH_CAP_FILE_SHARED (which will be revoked by
89 * the MDS if/when the directory is modified).
91 static int __dcache_readdir(struct file
*filp
,
92 void *dirent
, filldir_t filldir
)
94 struct inode
*inode
= filp
->f_dentry
->d_inode
;
95 struct ceph_file_info
*fi
= filp
->private_data
;
96 struct dentry
*parent
= filp
->f_dentry
;
97 struct inode
*dir
= parent
->d_inode
;
99 struct dentry
*dentry
, *last
;
100 struct ceph_dentry_info
*di
;
103 /* claim ref on last dentry we returned */
107 dout("__dcache_readdir %p at %llu (last %p)\n", dir
, filp
->f_pos
,
110 spin_lock(&dcache_lock
);
112 /* start at beginning? */
113 if (filp
->f_pos
== 2 || (last
&&
114 filp
->f_pos
< ceph_dentry(last
)->offset
)) {
115 if (list_empty(&parent
->d_subdirs
))
117 p
= parent
->d_subdirs
.prev
;
118 dout(" initial p %p/%p\n", p
->prev
, p
->next
);
120 p
= last
->d_u
.d_child
.prev
;
124 dentry
= list_entry(p
, struct dentry
, d_u
.d_child
);
125 di
= ceph_dentry(dentry
);
127 dout(" p %p/%p d_subdirs %p/%p\n", p
->prev
, p
->next
,
128 parent
->d_subdirs
.prev
, parent
->d_subdirs
.next
);
129 if (p
== &parent
->d_subdirs
) {
133 if (!d_unhashed(dentry
) && dentry
->d_inode
&&
134 ceph_snap(dentry
->d_inode
) != CEPH_SNAPDIR
&&
135 ceph_ino(dentry
->d_inode
) != CEPH_INO_CEPH
&&
136 filp
->f_pos
<= di
->offset
)
138 dout(" skipping %p %.*s at %llu (%llu)%s%s\n", dentry
,
139 dentry
->d_name
.len
, dentry
->d_name
.name
, di
->offset
,
140 filp
->f_pos
, d_unhashed(dentry
) ? " unhashed" : "",
141 !dentry
->d_inode
? " null" : "");
143 dentry
= list_entry(p
, struct dentry
, d_u
.d_child
);
144 di
= ceph_dentry(dentry
);
147 atomic_inc(&dentry
->d_count
);
148 spin_unlock(&dcache_lock
);
149 spin_unlock(&inode
->i_lock
);
151 dout(" %llu (%llu) dentry %p %.*s %p\n", di
->offset
, filp
->f_pos
,
152 dentry
, dentry
->d_name
.len
, dentry
->d_name
.name
, dentry
->d_inode
);
153 filp
->f_pos
= di
->offset
;
154 err
= filldir(dirent
, dentry
->d_name
.name
,
155 dentry
->d_name
.len
, di
->offset
,
156 dentry
->d_inode
->i_ino
,
157 dentry
->d_inode
->i_mode
>> 12);
161 /* remember our position */
163 fi
->next_offset
= di
->offset
;
170 spin_lock(&inode
->i_lock
);
171 spin_lock(&dcache_lock
);
181 /* make sure a dentry wasn't dropped while we didn't have dcache_lock */
182 if ((ceph_inode(dir
)->i_ceph_flags
& CEPH_I_COMPLETE
))
184 dout(" lost I_COMPLETE on %p; falling back to mds\n", dir
);
188 spin_unlock(&dcache_lock
);
191 spin_unlock(&inode
->i_lock
);
193 spin_lock(&inode
->i_lock
);
200 * make note of the last dentry we read, so we can
201 * continue at the same lexicographical point,
202 * regardless of what dir changes take place on the
205 static int note_last_dentry(struct ceph_file_info
*fi
, const char *name
,
208 kfree(fi
->last_name
);
209 fi
->last_name
= kmalloc(len
+1, GFP_NOFS
);
212 memcpy(fi
->last_name
, name
, len
);
213 fi
->last_name
[len
] = 0;
214 dout("note_last_dentry '%s'\n", fi
->last_name
);
218 static int ceph_readdir(struct file
*filp
, void *dirent
, filldir_t filldir
)
220 struct ceph_file_info
*fi
= filp
->private_data
;
221 struct inode
*inode
= filp
->f_dentry
->d_inode
;
222 struct ceph_inode_info
*ci
= ceph_inode(inode
);
223 struct ceph_client
*client
= ceph_inode_to_client(inode
);
224 struct ceph_mds_client
*mdsc
= &client
->mdsc
;
225 unsigned frag
= fpos_frag(filp
->f_pos
);
226 int off
= fpos_off(filp
->f_pos
);
229 struct ceph_mds_reply_info_parsed
*rinfo
;
230 const int max_entries
= client
->mount_args
->max_readdir
;
232 dout("readdir %p filp %p frag %u off %u\n", inode
, filp
, frag
, off
);
236 /* always start with . and .. */
237 if (filp
->f_pos
== 0) {
238 /* note dir version at start of readdir so we can tell
239 * if any dentries get dropped */
240 fi
->dir_release_count
= ci
->i_release_count
;
242 dout("readdir off 0 -> '.'\n");
243 if (filldir(dirent
, ".", 1, ceph_make_fpos(0, 0),
244 inode
->i_ino
, inode
->i_mode
>> 12) < 0)
249 if (filp
->f_pos
== 1) {
250 dout("readdir off 1 -> '..'\n");
251 if (filldir(dirent
, "..", 2, ceph_make_fpos(0, 1),
252 filp
->f_dentry
->d_parent
->d_inode
->i_ino
,
253 inode
->i_mode
>> 12) < 0)
259 /* can we use the dcache? */
260 spin_lock(&inode
->i_lock
);
261 if ((filp
->f_pos
== 2 || fi
->dentry
) &&
262 !ceph_test_opt(client
, NOASYNCREADDIR
) &&
263 (ci
->i_ceph_flags
& CEPH_I_COMPLETE
) &&
264 __ceph_caps_issued_mask(ci
, CEPH_CAP_FILE_SHARED
, 1)) {
265 err
= __dcache_readdir(filp
, dirent
, filldir
);
266 if (err
!= -EAGAIN
) {
267 spin_unlock(&inode
->i_lock
);
271 spin_unlock(&inode
->i_lock
);
273 err
= note_last_dentry(fi
, fi
->dentry
->d_name
.name
,
274 fi
->dentry
->d_name
.len
);
281 /* proceed with a normal readdir */
284 /* do we have the correct frag content buffered? */
285 if (fi
->frag
!= frag
|| fi
->last_readdir
== NULL
) {
286 struct ceph_mds_request
*req
;
287 int op
= ceph_snap(inode
) == CEPH_SNAPDIR
?
288 CEPH_MDS_OP_LSSNAP
: CEPH_MDS_OP_READDIR
;
290 /* discard old result, if any */
291 if (fi
->last_readdir
)
292 ceph_mdsc_put_request(fi
->last_readdir
);
294 /* requery frag tree, as the frag topology may have changed */
295 frag
= ceph_choose_frag(ceph_inode(inode
), frag
, NULL
, NULL
);
297 dout("readdir fetching %llx.%llx frag %x offset '%s'\n",
298 ceph_vinop(inode
), frag
, fi
->last_name
);
299 req
= ceph_mdsc_create_request(mdsc
, op
, USE_AUTH_MDS
);
302 req
->r_inode
= igrab(inode
);
303 req
->r_dentry
= dget(filp
->f_dentry
);
304 /* hints to request -> mds selection code */
305 req
->r_direct_mode
= USE_AUTH_MDS
;
306 req
->r_direct_hash
= ceph_frag_value(frag
);
307 req
->r_direct_is_hash
= true;
308 req
->r_path2
= kstrdup(fi
->last_name
, GFP_NOFS
);
309 req
->r_readdir_offset
= fi
->next_offset
;
310 req
->r_args
.readdir
.frag
= cpu_to_le32(frag
);
311 req
->r_args
.readdir
.max_entries
= cpu_to_le32(max_entries
);
312 req
->r_num_caps
= max_entries
;
313 err
= ceph_mdsc_do_request(mdsc
, NULL
, req
);
315 ceph_mdsc_put_request(req
);
318 dout("readdir got and parsed readdir result=%d"
319 " on frag %x, end=%d, complete=%d\n", err
, frag
,
320 (int)req
->r_reply_info
.dir_end
,
321 (int)req
->r_reply_info
.dir_complete
);
323 if (!req
->r_did_prepopulate
) {
324 dout("readdir !did_prepopulate");
325 fi
->dir_release_count
--; /* preclude I_COMPLETE */
328 /* note next offset and last dentry name */
329 fi
->offset
= fi
->next_offset
;
330 fi
->last_readdir
= req
;
332 if (req
->r_reply_info
.dir_end
) {
333 kfree(fi
->last_name
);
334 fi
->last_name
= NULL
;
337 rinfo
= &req
->r_reply_info
;
338 err
= note_last_dentry(fi
,
339 rinfo
->dir_dname
[rinfo
->dir_nr
-1],
340 rinfo
->dir_dname_len
[rinfo
->dir_nr
-1]);
343 fi
->next_offset
+= rinfo
->dir_nr
;
347 rinfo
= &fi
->last_readdir
->r_reply_info
;
348 dout("readdir frag %x num %d off %d chunkoff %d\n", frag
,
349 rinfo
->dir_nr
, off
, fi
->offset
);
350 while (off
- fi
->offset
>= 0 && off
- fi
->offset
< rinfo
->dir_nr
) {
351 u64 pos
= ceph_make_fpos(frag
, off
);
352 struct ceph_mds_reply_inode
*in
=
353 rinfo
->dir_in
[off
- fi
->offset
].in
;
354 dout("readdir off %d (%d/%d) -> %lld '%.*s' %p\n",
355 off
, off
- fi
->offset
, rinfo
->dir_nr
, pos
,
356 rinfo
->dir_dname_len
[off
- fi
->offset
],
357 rinfo
->dir_dname
[off
- fi
->offset
], in
);
359 ftype
= le32_to_cpu(in
->mode
) >> 12;
361 rinfo
->dir_dname
[off
- fi
->offset
],
362 rinfo
->dir_dname_len
[off
- fi
->offset
],
364 le64_to_cpu(in
->ino
),
366 dout("filldir stopping us...\n");
370 filp
->f_pos
= pos
+ 1;
374 ceph_mdsc_put_request(fi
->last_readdir
);
375 fi
->last_readdir
= NULL
;
380 if (!ceph_frag_is_rightmost(frag
)) {
381 frag
= ceph_frag_next(frag
);
383 filp
->f_pos
= ceph_make_fpos(frag
, off
);
384 dout("readdir next frag is %x\n", frag
);
390 * if dir_release_count still matches the dir, no dentries
391 * were released during the whole readdir, and we should have
392 * the complete dir contents in our cache.
394 spin_lock(&inode
->i_lock
);
395 if (ci
->i_release_count
== fi
->dir_release_count
) {
396 dout(" marking %p complete\n", inode
);
397 ci
->i_ceph_flags
|= CEPH_I_COMPLETE
;
398 ci
->i_max_offset
= filp
->f_pos
;
400 spin_unlock(&inode
->i_lock
);
402 dout("readdir %p filp %p done.\n", inode
, filp
);
406 static void reset_readdir(struct ceph_file_info
*fi
)
408 if (fi
->last_readdir
) {
409 ceph_mdsc_put_request(fi
->last_readdir
);
410 fi
->last_readdir
= NULL
;
412 kfree(fi
->last_name
);
413 fi
->next_offset
= 2; /* compensate for . and .. */
421 static loff_t
ceph_dir_llseek(struct file
*file
, loff_t offset
, int origin
)
423 struct ceph_file_info
*fi
= file
->private_data
;
424 struct inode
*inode
= file
->f_mapping
->host
;
425 loff_t old_offset
= offset
;
428 mutex_lock(&inode
->i_mutex
);
431 offset
+= inode
->i_size
+ 2; /* FIXME */
434 offset
+= file
->f_pos
;
437 if (offset
>= 0 && offset
<= inode
->i_sb
->s_maxbytes
) {
438 if (offset
!= file
->f_pos
) {
439 file
->f_pos
= offset
;
446 * discard buffered readdir content on seekdir(0), or
447 * seek to new frag, or seek prior to current chunk.
450 fpos_frag(offset
) != fpos_frag(old_offset
) ||
451 fpos_off(offset
) < fi
->offset
) {
452 dout("dir_llseek dropping %p content\n", file
);
456 /* bump dir_release_count if we did a forward seek */
457 if (offset
> old_offset
)
458 fi
->dir_release_count
--;
460 mutex_unlock(&inode
->i_mutex
);
465 * Process result of a lookup/open request.
467 * Mainly, make sure we return the final req->r_dentry (if it already
468 * existed) in place of the original VFS-provided dentry when they
471 * Gracefully handle the case where the MDS replies with -ENOENT and
472 * no trace (which it may do, at its discretion, e.g., if it doesn't
473 * care to issue a lease on the negative dentry).
475 struct dentry
*ceph_finish_lookup(struct ceph_mds_request
*req
,
476 struct dentry
*dentry
, int err
)
478 struct ceph_client
*client
= ceph_client(dentry
->d_sb
);
479 struct inode
*parent
= dentry
->d_parent
->d_inode
;
482 if (err
== -ENOENT
&&
483 ceph_vino(parent
).ino
!= CEPH_INO_ROOT
&& /* no .snap in root dir */
484 strcmp(dentry
->d_name
.name
,
485 client
->mount_args
->snapdir_name
) == 0) {
486 struct inode
*inode
= ceph_get_snapdir(parent
);
487 dout("ENOENT on snapdir %p '%.*s', linking to snapdir %p\n",
488 dentry
, dentry
->d_name
.len
, dentry
->d_name
.name
, inode
);
489 d_add(dentry
, inode
);
493 if (err
== -ENOENT
) {
496 if (!req
->r_reply_info
.head
->is_dentry
) {
497 dout("ENOENT and no trace, dentry %p inode %p\n",
498 dentry
, dentry
->d_inode
);
499 if (dentry
->d_inode
) {
508 dentry
= ERR_PTR(err
);
509 else if (dentry
!= req
->r_dentry
)
510 dentry
= dget(req
->r_dentry
); /* we got spliced */
516 static int is_root_ceph_dentry(struct inode
*inode
, struct dentry
*dentry
)
518 return ceph_ino(inode
) == CEPH_INO_ROOT
&&
519 strncmp(dentry
->d_name
.name
, ".ceph", 5) == 0;
523 * Look up a single dir entry. If there is a lookup intent, inform
524 * the MDS so that it gets our 'caps wanted' value in a single op.
526 static struct dentry
*ceph_lookup(struct inode
*dir
, struct dentry
*dentry
,
527 struct nameidata
*nd
)
529 struct ceph_client
*client
= ceph_sb_to_client(dir
->i_sb
);
530 struct ceph_mds_client
*mdsc
= &client
->mdsc
;
531 struct ceph_mds_request
*req
;
535 dout("lookup %p dentry %p '%.*s'\n",
536 dir
, dentry
, dentry
->d_name
.len
, dentry
->d_name
.name
);
538 if (dentry
->d_name
.len
> NAME_MAX
)
539 return ERR_PTR(-ENAMETOOLONG
);
541 err
= ceph_init_dentry(dentry
);
545 /* open (but not create!) intent? */
547 (nd
->flags
& LOOKUP_OPEN
) &&
548 (nd
->flags
& LOOKUP_CONTINUE
) == 0 && /* only open last component */
549 !(nd
->intent
.open
.flags
& O_CREAT
)) {
550 int mode
= nd
->intent
.open
.create_mode
& ~current
->fs
->umask
;
551 return ceph_lookup_open(dir
, dentry
, nd
, mode
, 1);
554 /* can we conclude ENOENT locally? */
555 if (dentry
->d_inode
== NULL
) {
556 struct ceph_inode_info
*ci
= ceph_inode(dir
);
557 struct ceph_dentry_info
*di
= ceph_dentry(dentry
);
559 spin_lock(&dir
->i_lock
);
560 dout(" dir %p flags are %d\n", dir
, ci
->i_ceph_flags
);
561 if (strncmp(dentry
->d_name
.name
,
562 client
->mount_args
->snapdir_name
,
563 dentry
->d_name
.len
) &&
564 !is_root_ceph_dentry(dir
, dentry
) &&
565 (ci
->i_ceph_flags
& CEPH_I_COMPLETE
) &&
566 (__ceph_caps_issued_mask(ci
, CEPH_CAP_FILE_SHARED
, 1))) {
567 di
->offset
= ci
->i_max_offset
++;
568 spin_unlock(&dir
->i_lock
);
569 dout(" dir %p complete, -ENOENT\n", dir
);
571 di
->lease_shared_gen
= ci
->i_shared_gen
;
574 spin_unlock(&dir
->i_lock
);
577 op
= ceph_snap(dir
) == CEPH_SNAPDIR
?
578 CEPH_MDS_OP_LOOKUPSNAP
: CEPH_MDS_OP_LOOKUP
;
579 req
= ceph_mdsc_create_request(mdsc
, op
, USE_ANY_MDS
);
581 return ERR_PTR(PTR_ERR(req
));
582 req
->r_dentry
= dget(dentry
);
584 /* we only need inode linkage */
585 req
->r_args
.getattr
.mask
= cpu_to_le32(CEPH_STAT_CAP_INODE
);
586 req
->r_locked_dir
= dir
;
587 err
= ceph_mdsc_do_request(mdsc
, NULL
, req
);
588 dentry
= ceph_finish_lookup(req
, dentry
, err
);
589 ceph_mdsc_put_request(req
); /* will dput(dentry) */
590 dout("lookup result=%p\n", dentry
);
595 * If we do a create but get no trace back from the MDS, follow up with
596 * a lookup (the VFS expects us to link up the provided dentry).
598 int ceph_handle_notrace_create(struct inode
*dir
, struct dentry
*dentry
)
600 struct dentry
*result
= ceph_lookup(dir
, dentry
, NULL
);
602 if (result
&& !IS_ERR(result
)) {
604 * We created the item, then did a lookup, and found
605 * it was already linked to another inode we already
606 * had in our cache (and thus got spliced). Link our
607 * dentry to that inode, but don't hash it, just in
608 * case the VFS wants to dereference it.
610 BUG_ON(!result
->d_inode
);
611 d_instantiate(dentry
, result
->d_inode
);
614 return PTR_ERR(result
);
617 static int ceph_mknod(struct inode
*dir
, struct dentry
*dentry
,
618 int mode
, dev_t rdev
)
620 struct ceph_client
*client
= ceph_sb_to_client(dir
->i_sb
);
621 struct ceph_mds_client
*mdsc
= &client
->mdsc
;
622 struct ceph_mds_request
*req
;
625 if (ceph_snap(dir
) != CEPH_NOSNAP
)
628 dout("mknod in dir %p dentry %p mode 0%o rdev %d\n",
629 dir
, dentry
, mode
, rdev
);
630 req
= ceph_mdsc_create_request(mdsc
, CEPH_MDS_OP_MKNOD
, USE_AUTH_MDS
);
635 req
->r_dentry
= dget(dentry
);
637 req
->r_locked_dir
= dir
;
638 req
->r_args
.mknod
.mode
= cpu_to_le32(mode
);
639 req
->r_args
.mknod
.rdev
= cpu_to_le32(rdev
);
640 req
->r_dentry_drop
= CEPH_CAP_FILE_SHARED
;
641 req
->r_dentry_unless
= CEPH_CAP_FILE_EXCL
;
642 err
= ceph_mdsc_do_request(mdsc
, dir
, req
);
643 if (!err
&& !req
->r_reply_info
.head
->is_dentry
)
644 err
= ceph_handle_notrace_create(dir
, dentry
);
645 ceph_mdsc_put_request(req
);
651 static int ceph_create(struct inode
*dir
, struct dentry
*dentry
, int mode
,
652 struct nameidata
*nd
)
654 dout("create in dir %p dentry %p name '%.*s'\n",
655 dir
, dentry
, dentry
->d_name
.len
, dentry
->d_name
.name
);
657 if (ceph_snap(dir
) != CEPH_NOSNAP
)
661 BUG_ON((nd
->flags
& LOOKUP_OPEN
) == 0);
662 dentry
= ceph_lookup_open(dir
, dentry
, nd
, mode
, 0);
663 /* hrm, what should i do here if we get aliased? */
665 return PTR_ERR(dentry
);
669 /* fall back to mknod */
670 return ceph_mknod(dir
, dentry
, (mode
& ~S_IFMT
) | S_IFREG
, 0);
673 static int ceph_symlink(struct inode
*dir
, struct dentry
*dentry
,
676 struct ceph_client
*client
= ceph_sb_to_client(dir
->i_sb
);
677 struct ceph_mds_client
*mdsc
= &client
->mdsc
;
678 struct ceph_mds_request
*req
;
681 if (ceph_snap(dir
) != CEPH_NOSNAP
)
684 dout("symlink in dir %p dentry %p to '%s'\n", dir
, dentry
, dest
);
685 req
= ceph_mdsc_create_request(mdsc
, CEPH_MDS_OP_SYMLINK
, USE_AUTH_MDS
);
690 req
->r_dentry
= dget(dentry
);
692 req
->r_path2
= kstrdup(dest
, GFP_NOFS
);
693 req
->r_locked_dir
= dir
;
694 req
->r_dentry_drop
= CEPH_CAP_FILE_SHARED
;
695 req
->r_dentry_unless
= CEPH_CAP_FILE_EXCL
;
696 err
= ceph_mdsc_do_request(mdsc
, dir
, req
);
697 if (!err
&& !req
->r_reply_info
.head
->is_dentry
)
698 err
= ceph_handle_notrace_create(dir
, dentry
);
699 ceph_mdsc_put_request(req
);
705 static int ceph_mkdir(struct inode
*dir
, struct dentry
*dentry
, int mode
)
707 struct ceph_client
*client
= ceph_sb_to_client(dir
->i_sb
);
708 struct ceph_mds_client
*mdsc
= &client
->mdsc
;
709 struct ceph_mds_request
*req
;
713 if (ceph_snap(dir
) == CEPH_SNAPDIR
) {
714 /* mkdir .snap/foo is a MKSNAP */
715 op
= CEPH_MDS_OP_MKSNAP
;
716 dout("mksnap dir %p snap '%.*s' dn %p\n", dir
,
717 dentry
->d_name
.len
, dentry
->d_name
.name
, dentry
);
718 } else if (ceph_snap(dir
) == CEPH_NOSNAP
) {
719 dout("mkdir dir %p dn %p mode 0%o\n", dir
, dentry
, mode
);
720 op
= CEPH_MDS_OP_MKDIR
;
724 req
= ceph_mdsc_create_request(mdsc
, op
, USE_AUTH_MDS
);
730 req
->r_dentry
= dget(dentry
);
732 req
->r_locked_dir
= dir
;
733 req
->r_args
.mkdir
.mode
= cpu_to_le32(mode
);
734 req
->r_dentry_drop
= CEPH_CAP_FILE_SHARED
;
735 req
->r_dentry_unless
= CEPH_CAP_FILE_EXCL
;
736 err
= ceph_mdsc_do_request(mdsc
, dir
, req
);
737 if (!err
&& !req
->r_reply_info
.head
->is_dentry
)
738 err
= ceph_handle_notrace_create(dir
, dentry
);
739 ceph_mdsc_put_request(req
);
746 static int ceph_link(struct dentry
*old_dentry
, struct inode
*dir
,
747 struct dentry
*dentry
)
749 struct ceph_client
*client
= ceph_sb_to_client(dir
->i_sb
);
750 struct ceph_mds_client
*mdsc
= &client
->mdsc
;
751 struct ceph_mds_request
*req
;
754 if (ceph_snap(dir
) != CEPH_NOSNAP
)
757 dout("link in dir %p old_dentry %p dentry %p\n", dir
,
759 req
= ceph_mdsc_create_request(mdsc
, CEPH_MDS_OP_LINK
, USE_AUTH_MDS
);
764 req
->r_dentry
= dget(dentry
);
766 req
->r_old_dentry
= dget(old_dentry
); /* or inode? hrm. */
767 req
->r_locked_dir
= dir
;
768 req
->r_dentry_drop
= CEPH_CAP_FILE_SHARED
;
769 req
->r_dentry_unless
= CEPH_CAP_FILE_EXCL
;
770 err
= ceph_mdsc_do_request(mdsc
, dir
, req
);
773 else if (!req
->r_reply_info
.head
->is_dentry
)
774 d_instantiate(dentry
, igrab(old_dentry
->d_inode
));
775 ceph_mdsc_put_request(req
);
780 * For a soon-to-be unlinked file, drop the AUTH_RDCACHE caps. If it
781 * looks like the link count will hit 0, drop any other caps (other
782 * than PIN) we don't specifically want (due to the file still being
785 static int drop_caps_for_unlink(struct inode
*inode
)
787 struct ceph_inode_info
*ci
= ceph_inode(inode
);
788 int drop
= CEPH_CAP_LINK_SHARED
| CEPH_CAP_LINK_EXCL
;
790 spin_lock(&inode
->i_lock
);
791 if (inode
->i_nlink
== 1) {
792 drop
|= ~(__ceph_caps_wanted(ci
) | CEPH_CAP_PIN
);
793 ci
->i_ceph_flags
|= CEPH_I_NODELAY
;
795 spin_unlock(&inode
->i_lock
);
800 * rmdir and unlink are differ only by the metadata op code
802 static int ceph_unlink(struct inode
*dir
, struct dentry
*dentry
)
804 struct ceph_client
*client
= ceph_sb_to_client(dir
->i_sb
);
805 struct ceph_mds_client
*mdsc
= &client
->mdsc
;
806 struct inode
*inode
= dentry
->d_inode
;
807 struct ceph_mds_request
*req
;
811 if (ceph_snap(dir
) == CEPH_SNAPDIR
) {
812 /* rmdir .snap/foo is RMSNAP */
813 dout("rmsnap dir %p '%.*s' dn %p\n", dir
, dentry
->d_name
.len
,
814 dentry
->d_name
.name
, dentry
);
815 op
= CEPH_MDS_OP_RMSNAP
;
816 } else if (ceph_snap(dir
) == CEPH_NOSNAP
) {
817 dout("unlink/rmdir dir %p dn %p inode %p\n",
819 op
= ((dentry
->d_inode
->i_mode
& S_IFMT
) == S_IFDIR
) ?
820 CEPH_MDS_OP_RMDIR
: CEPH_MDS_OP_UNLINK
;
823 req
= ceph_mdsc_create_request(mdsc
, op
, USE_AUTH_MDS
);
828 req
->r_dentry
= dget(dentry
);
830 req
->r_locked_dir
= dir
;
831 req
->r_dentry_drop
= CEPH_CAP_FILE_SHARED
;
832 req
->r_dentry_unless
= CEPH_CAP_FILE_EXCL
;
833 req
->r_inode_drop
= drop_caps_for_unlink(inode
);
834 err
= ceph_mdsc_do_request(mdsc
, dir
, req
);
835 if (!err
&& !req
->r_reply_info
.head
->is_dentry
)
837 ceph_mdsc_put_request(req
);
842 static int ceph_rename(struct inode
*old_dir
, struct dentry
*old_dentry
,
843 struct inode
*new_dir
, struct dentry
*new_dentry
)
845 struct ceph_client
*client
= ceph_sb_to_client(old_dir
->i_sb
);
846 struct ceph_mds_client
*mdsc
= &client
->mdsc
;
847 struct ceph_mds_request
*req
;
850 if (ceph_snap(old_dir
) != ceph_snap(new_dir
))
852 if (ceph_snap(old_dir
) != CEPH_NOSNAP
||
853 ceph_snap(new_dir
) != CEPH_NOSNAP
)
855 dout("rename dir %p dentry %p to dir %p dentry %p\n",
856 old_dir
, old_dentry
, new_dir
, new_dentry
);
857 req
= ceph_mdsc_create_request(mdsc
, CEPH_MDS_OP_RENAME
, USE_AUTH_MDS
);
860 req
->r_dentry
= dget(new_dentry
);
862 req
->r_old_dentry
= dget(old_dentry
);
863 req
->r_locked_dir
= new_dir
;
864 req
->r_old_dentry_drop
= CEPH_CAP_FILE_SHARED
;
865 req
->r_old_dentry_unless
= CEPH_CAP_FILE_EXCL
;
866 req
->r_dentry_drop
= CEPH_CAP_FILE_SHARED
;
867 req
->r_dentry_unless
= CEPH_CAP_FILE_EXCL
;
868 /* release LINK_RDCACHE on source inode (mds will lock it) */
869 req
->r_old_inode_drop
= CEPH_CAP_LINK_SHARED
;
870 if (new_dentry
->d_inode
)
871 req
->r_inode_drop
= drop_caps_for_unlink(new_dentry
->d_inode
);
872 err
= ceph_mdsc_do_request(mdsc
, old_dir
, req
);
873 if (!err
&& !req
->r_reply_info
.head
->is_dentry
) {
875 * Normally d_move() is done by fill_trace (called by
876 * do_request, above). If there is no trace, we need
879 d_move(old_dentry
, new_dentry
);
881 ceph_mdsc_put_request(req
);
887 * Check if dentry lease is valid. If not, delete the lease. Try to
888 * renew if the least is more than half up.
890 static int dentry_lease_is_valid(struct dentry
*dentry
)
892 struct ceph_dentry_info
*di
;
893 struct ceph_mds_session
*s
;
897 struct ceph_mds_session
*session
= NULL
;
898 struct inode
*dir
= NULL
;
901 spin_lock(&dentry
->d_lock
);
902 di
= ceph_dentry(dentry
);
903 if (di
&& di
->lease_session
) {
904 s
= di
->lease_session
;
905 spin_lock(&s
->s_cap_lock
);
908 spin_unlock(&s
->s_cap_lock
);
910 if (di
->lease_gen
== gen
&&
911 time_before(jiffies
, dentry
->d_time
) &&
912 time_before(jiffies
, ttl
)) {
914 if (di
->lease_renew_after
&&
915 time_after(jiffies
, di
->lease_renew_after
)) {
916 /* we should renew */
917 dir
= dentry
->d_parent
->d_inode
;
918 session
= ceph_get_mds_session(s
);
920 di
->lease_renew_after
= 0;
921 di
->lease_renew_from
= jiffies
;
925 spin_unlock(&dentry
->d_lock
);
928 ceph_mdsc_lease_send_msg(session
, dir
, dentry
,
929 CEPH_MDS_LEASE_RENEW
, seq
);
930 ceph_put_mds_session(session
);
932 dout("dentry_lease_is_valid - dentry %p = %d\n", dentry
, valid
);
937 * Check if directory-wide content lease/cap is valid.
939 static int dir_lease_is_valid(struct inode
*dir
, struct dentry
*dentry
)
941 struct ceph_inode_info
*ci
= ceph_inode(dir
);
942 struct ceph_dentry_info
*di
= ceph_dentry(dentry
);
945 spin_lock(&dir
->i_lock
);
946 if (ci
->i_shared_gen
== di
->lease_shared_gen
)
947 valid
= __ceph_caps_issued_mask(ci
, CEPH_CAP_FILE_SHARED
, 1);
948 spin_unlock(&dir
->i_lock
);
949 dout("dir_lease_is_valid dir %p v%u dentry %p v%u = %d\n",
950 dir
, (unsigned)ci
->i_shared_gen
, dentry
,
951 (unsigned)di
->lease_shared_gen
, valid
);
956 * Check if cached dentry can be trusted.
958 static int ceph_d_revalidate(struct dentry
*dentry
, struct nameidata
*nd
)
960 struct inode
*dir
= dentry
->d_parent
->d_inode
;
962 dout("d_revalidate %p '%.*s' inode %p\n", dentry
,
963 dentry
->d_name
.len
, dentry
->d_name
.name
, dentry
->d_inode
);
965 /* always trust cached snapped dentries, snapdir dentry */
966 if (ceph_snap(dir
) != CEPH_NOSNAP
) {
967 dout("d_revalidate %p '%.*s' inode %p is SNAPPED\n", dentry
,
968 dentry
->d_name
.len
, dentry
->d_name
.name
, dentry
->d_inode
);
971 if (dentry
->d_inode
&& ceph_snap(dentry
->d_inode
) == CEPH_SNAPDIR
)
974 if (dentry_lease_is_valid(dentry
) ||
975 dir_lease_is_valid(dir
, dentry
))
978 dout("d_revalidate %p invalid\n", dentry
);
982 ceph_dentry_lru_touch(dentry
);
987 * When a dentry is released, clear the dir I_COMPLETE if it was part
988 * of the current dir gen.
990 static void ceph_dentry_release(struct dentry
*dentry
)
992 struct ceph_dentry_info
*di
= ceph_dentry(dentry
);
993 struct inode
*parent_inode
= dentry
->d_parent
->d_inode
;
996 struct ceph_inode_info
*ci
= ceph_inode(parent_inode
);
998 spin_lock(&parent_inode
->i_lock
);
999 if (ci
->i_shared_gen
== di
->lease_shared_gen
) {
1000 dout(" clearing %p complete (d_release)\n",
1002 ci
->i_ceph_flags
&= ~CEPH_I_COMPLETE
;
1003 ci
->i_release_count
++;
1005 spin_unlock(&parent_inode
->i_lock
);
1008 ceph_dentry_lru_del(dentry
);
1009 if (di
->lease_session
)
1010 ceph_put_mds_session(di
->lease_session
);
1011 kmem_cache_free(ceph_dentry_cachep
, di
);
1012 dentry
->d_fsdata
= NULL
;
1016 static int ceph_snapdir_d_revalidate(struct dentry
*dentry
,
1017 struct nameidata
*nd
)
1020 * Eventually, we'll want to revalidate snapped metadata
1021 * too... probably...
1029 * read() on a dir. This weird interface hack only works if mounted
1030 * with '-o dirstat'.
1032 static ssize_t
ceph_read_dir(struct file
*file
, char __user
*buf
, size_t size
,
1035 struct ceph_file_info
*cf
= file
->private_data
;
1036 struct inode
*inode
= file
->f_dentry
->d_inode
;
1037 struct ceph_inode_info
*ci
= ceph_inode(inode
);
1040 if (!ceph_test_opt(ceph_client(inode
->i_sb
), DIRSTAT
))
1043 if (!cf
->dir_info
) {
1044 cf
->dir_info
= kmalloc(1024, GFP_NOFS
);
1048 sprintf(cf
->dir_info
,
1051 " subdirs: %20lld\n"
1052 "rentries: %20lld\n"
1054 " rsubdirs: %20lld\n"
1056 "rctime: %10ld.%09ld\n",
1057 ci
->i_files
+ ci
->i_subdirs
,
1060 ci
->i_rfiles
+ ci
->i_rsubdirs
,
1064 (long)ci
->i_rctime
.tv_sec
,
1065 (long)ci
->i_rctime
.tv_nsec
);
1068 if (*ppos
>= cf
->dir_info_len
)
1070 size
= min_t(unsigned, size
, cf
->dir_info_len
-*ppos
);
1071 left
= copy_to_user(buf
, cf
->dir_info
+ *ppos
, size
);
1074 *ppos
+= (size
- left
);
1079 * an fsync() on a dir will wait for any uncommitted directory
1080 * operations to commit.
1082 static int ceph_dir_fsync(struct file
*file
, struct dentry
*dentry
,
1085 struct inode
*inode
= dentry
->d_inode
;
1086 struct ceph_inode_info
*ci
= ceph_inode(inode
);
1087 struct list_head
*head
= &ci
->i_unsafe_dirops
;
1088 struct ceph_mds_request
*req
;
1092 dout("dir_fsync %p\n", inode
);
1093 spin_lock(&ci
->i_unsafe_lock
);
1094 if (list_empty(head
))
1097 req
= list_entry(head
->prev
,
1098 struct ceph_mds_request
, r_unsafe_dir_item
);
1099 last_tid
= req
->r_tid
;
1102 ceph_mdsc_get_request(req
);
1103 spin_unlock(&ci
->i_unsafe_lock
);
1104 dout("dir_fsync %p wait on tid %llu (until %llu)\n",
1105 inode
, req
->r_tid
, last_tid
);
1106 if (req
->r_timeout
) {
1107 ret
= wait_for_completion_timeout(
1108 &req
->r_safe_completion
, req
->r_timeout
);
1112 ret
= -EIO
; /* timed out */
1114 wait_for_completion(&req
->r_safe_completion
);
1116 spin_lock(&ci
->i_unsafe_lock
);
1117 ceph_mdsc_put_request(req
);
1119 if (ret
|| list_empty(head
))
1121 req
= list_entry(head
->next
,
1122 struct ceph_mds_request
, r_unsafe_dir_item
);
1123 } while (req
->r_tid
< last_tid
);
1125 spin_unlock(&ci
->i_unsafe_lock
);
1130 * We maintain a private dentry LRU.
1132 * FIXME: this needs to be changed to a per-mds lru to be useful.
1134 void ceph_dentry_lru_add(struct dentry
*dn
)
1136 struct ceph_dentry_info
*di
= ceph_dentry(dn
);
1137 struct ceph_mds_client
*mdsc
;
1138 dout("dentry_lru_add %p %p\t%.*s\n",
1139 di
, dn
, dn
->d_name
.len
, dn
->d_name
.name
);
1142 mdsc
= &ceph_client(dn
->d_sb
)->mdsc
;
1143 spin_lock(&mdsc
->dentry_lru_lock
);
1144 list_add_tail(&di
->lru
, &mdsc
->dentry_lru
);
1146 spin_unlock(&mdsc
->dentry_lru_lock
);
1150 void ceph_dentry_lru_touch(struct dentry
*dn
)
1152 struct ceph_dentry_info
*di
= ceph_dentry(dn
);
1153 struct ceph_mds_client
*mdsc
;
1154 dout("dentry_lru_touch %p %p\t%.*s\n",
1155 di
, dn
, dn
->d_name
.len
, dn
->d_name
.name
);
1158 mdsc
= &ceph_client(dn
->d_sb
)->mdsc
;
1159 spin_lock(&mdsc
->dentry_lru_lock
);
1160 list_move_tail(&di
->lru
, &mdsc
->dentry_lru
);
1161 spin_unlock(&mdsc
->dentry_lru_lock
);
1165 void ceph_dentry_lru_del(struct dentry
*dn
)
1167 struct ceph_dentry_info
*di
= ceph_dentry(dn
);
1168 struct ceph_mds_client
*mdsc
;
1170 dout("dentry_lru_del %p %p\t%.*s\n",
1171 di
, dn
, dn
->d_name
.len
, dn
->d_name
.name
);
1173 mdsc
= &ceph_client(dn
->d_sb
)->mdsc
;
1174 spin_lock(&mdsc
->dentry_lru_lock
);
1175 list_del_init(&di
->lru
);
1177 spin_unlock(&mdsc
->dentry_lru_lock
);
1181 const struct file_operations ceph_dir_fops
= {
1182 .read
= ceph_read_dir
,
1183 .readdir
= ceph_readdir
,
1184 .llseek
= ceph_dir_llseek
,
1186 .release
= ceph_release
,
1187 .unlocked_ioctl
= ceph_ioctl
,
1188 .fsync
= ceph_dir_fsync
,
1191 const struct inode_operations ceph_dir_iops
= {
1192 .lookup
= ceph_lookup
,
1193 .permission
= ceph_permission
,
1194 .getattr
= ceph_getattr
,
1195 .setattr
= ceph_setattr
,
1196 .setxattr
= ceph_setxattr
,
1197 .getxattr
= ceph_getxattr
,
1198 .listxattr
= ceph_listxattr
,
1199 .removexattr
= ceph_removexattr
,
1200 .mknod
= ceph_mknod
,
1201 .symlink
= ceph_symlink
,
1202 .mkdir
= ceph_mkdir
,
1204 .unlink
= ceph_unlink
,
1205 .rmdir
= ceph_unlink
,
1206 .rename
= ceph_rename
,
1207 .create
= ceph_create
,
1210 struct dentry_operations ceph_dentry_ops
= {
1211 .d_revalidate
= ceph_d_revalidate
,
1212 .d_release
= ceph_dentry_release
,
1215 struct dentry_operations ceph_snapdir_dentry_ops
= {
1216 .d_revalidate
= ceph_snapdir_d_revalidate
,
1219 struct dentry_operations ceph_snap_dentry_ops
= {