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
);
117 /* start at beginning? */
118 if (filp
->f_pos
== 2 || last
== NULL
||
119 filp
->f_pos
< ceph_dentry(last
)->offset
) {
120 if (list_empty(&parent
->d_subdirs
))
122 p
= parent
->d_subdirs
.prev
;
123 dout(" initial p %p/%p\n", p
->prev
, p
->next
);
125 p
= last
->d_u
.d_child
.prev
;
129 dentry
= list_entry(p
, struct dentry
, d_u
.d_child
);
130 di
= ceph_dentry(dentry
);
132 dout(" p %p/%p %s d_subdirs %p/%p\n", p
->prev
, p
->next
,
133 d_unhashed(dentry
) ? "!hashed" : "hashed",
134 parent
->d_subdirs
.prev
, parent
->d_subdirs
.next
);
135 if (p
== &parent
->d_subdirs
) {
139 if (!d_unhashed(dentry
) && dentry
->d_inode
&&
140 ceph_snap(dentry
->d_inode
) != CEPH_SNAPDIR
&&
141 ceph_ino(dentry
->d_inode
) != CEPH_INO_CEPH
&&
142 filp
->f_pos
<= di
->offset
)
144 dout(" skipping %p %.*s at %llu (%llu)%s%s\n", dentry
,
145 dentry
->d_name
.len
, dentry
->d_name
.name
, di
->offset
,
146 filp
->f_pos
, d_unhashed(dentry
) ? " unhashed" : "",
147 !dentry
->d_inode
? " null" : "");
149 dentry
= list_entry(p
, struct dentry
, d_u
.d_child
);
150 di
= ceph_dentry(dentry
);
153 spin_lock(&dentry
->d_lock
);
155 spin_unlock(&dentry
->d_lock
);
156 spin_unlock(&dcache_lock
);
158 dout(" %llu (%llu) dentry %p %.*s %p\n", di
->offset
, filp
->f_pos
,
159 dentry
, dentry
->d_name
.len
, dentry
->d_name
.name
, dentry
->d_inode
);
160 filp
->f_pos
= di
->offset
;
161 err
= filldir(dirent
, dentry
->d_name
.name
,
162 dentry
->d_name
.len
, di
->offset
,
163 dentry
->d_inode
->i_ino
,
164 dentry
->d_inode
->i_mode
>> 12);
168 /* remember our position */
170 fi
->next_offset
= di
->offset
;
182 /* make sure a dentry wasn't dropped while we didn't have dcache_lock */
183 if (!ceph_i_test(dir
, CEPH_I_COMPLETE
)) {
184 dout(" lost I_COMPLETE on %p; falling back to mds\n", dir
);
189 spin_lock(&dcache_lock
);
190 p
= p
->prev
; /* advance to next dentry */
194 spin_unlock(&dcache_lock
);
202 * make note of the last dentry we read, so we can
203 * continue at the same lexicographical point,
204 * regardless of what dir changes take place on the
207 static int note_last_dentry(struct ceph_file_info
*fi
, const char *name
,
210 kfree(fi
->last_name
);
211 fi
->last_name
= kmalloc(len
+1, GFP_NOFS
);
214 memcpy(fi
->last_name
, name
, len
);
215 fi
->last_name
[len
] = 0;
216 dout("note_last_dentry '%s'\n", fi
->last_name
);
220 static int ceph_readdir(struct file
*filp
, void *dirent
, filldir_t filldir
)
222 struct ceph_file_info
*fi
= filp
->private_data
;
223 struct inode
*inode
= filp
->f_dentry
->d_inode
;
224 struct ceph_inode_info
*ci
= ceph_inode(inode
);
225 struct ceph_fs_client
*fsc
= ceph_inode_to_client(inode
);
226 struct ceph_mds_client
*mdsc
= fsc
->mdsc
;
227 unsigned frag
= fpos_frag(filp
->f_pos
);
228 int off
= fpos_off(filp
->f_pos
);
231 struct ceph_mds_reply_info_parsed
*rinfo
;
232 const int max_entries
= fsc
->mount_options
->max_readdir
;
233 const int max_bytes
= fsc
->mount_options
->max_readdir_bytes
;
235 dout("readdir %p filp %p frag %u off %u\n", inode
, filp
, frag
, off
);
239 /* always start with . and .. */
240 if (filp
->f_pos
== 0) {
241 /* note dir version at start of readdir so we can tell
242 * if any dentries get dropped */
243 fi
->dir_release_count
= ci
->i_release_count
;
245 dout("readdir off 0 -> '.'\n");
246 if (filldir(dirent
, ".", 1, ceph_make_fpos(0, 0),
247 inode
->i_ino
, inode
->i_mode
>> 12) < 0)
252 if (filp
->f_pos
== 1) {
253 dout("readdir off 1 -> '..'\n");
254 if (filldir(dirent
, "..", 2, ceph_make_fpos(0, 1),
255 filp
->f_dentry
->d_parent
->d_inode
->i_ino
,
256 inode
->i_mode
>> 12) < 0)
262 /* can we use the dcache? */
263 spin_lock(&inode
->i_lock
);
264 if ((filp
->f_pos
== 2 || fi
->dentry
) &&
265 !ceph_test_mount_opt(fsc
, NOASYNCREADDIR
) &&
266 ceph_snap(inode
) != CEPH_SNAPDIR
&&
267 (ci
->i_ceph_flags
& CEPH_I_COMPLETE
) &&
268 __ceph_caps_issued_mask(ci
, CEPH_CAP_FILE_SHARED
, 1)) {
269 spin_unlock(&inode
->i_lock
);
270 err
= __dcache_readdir(filp
, dirent
, filldir
);
274 spin_unlock(&inode
->i_lock
);
277 err
= note_last_dentry(fi
, fi
->dentry
->d_name
.name
,
278 fi
->dentry
->d_name
.len
);
285 /* proceed with a normal readdir */
288 /* do we have the correct frag content buffered? */
289 if (fi
->frag
!= frag
|| fi
->last_readdir
== NULL
) {
290 struct ceph_mds_request
*req
;
291 int op
= ceph_snap(inode
) == CEPH_SNAPDIR
?
292 CEPH_MDS_OP_LSSNAP
: CEPH_MDS_OP_READDIR
;
294 /* discard old result, if any */
295 if (fi
->last_readdir
) {
296 ceph_mdsc_put_request(fi
->last_readdir
);
297 fi
->last_readdir
= NULL
;
300 /* requery frag tree, as the frag topology may have changed */
301 frag
= ceph_choose_frag(ceph_inode(inode
), frag
, NULL
, NULL
);
303 dout("readdir fetching %llx.%llx frag %x offset '%s'\n",
304 ceph_vinop(inode
), frag
, fi
->last_name
);
305 req
= ceph_mdsc_create_request(mdsc
, op
, USE_AUTH_MDS
);
308 req
->r_inode
= igrab(inode
);
309 req
->r_dentry
= dget(filp
->f_dentry
);
310 /* hints to request -> mds selection code */
311 req
->r_direct_mode
= USE_AUTH_MDS
;
312 req
->r_direct_hash
= ceph_frag_value(frag
);
313 req
->r_direct_is_hash
= true;
314 req
->r_path2
= kstrdup(fi
->last_name
, GFP_NOFS
);
315 req
->r_readdir_offset
= fi
->next_offset
;
316 req
->r_args
.readdir
.frag
= cpu_to_le32(frag
);
317 req
->r_args
.readdir
.max_entries
= cpu_to_le32(max_entries
);
318 req
->r_args
.readdir
.max_bytes
= cpu_to_le32(max_bytes
);
319 req
->r_num_caps
= max_entries
+ 1;
320 err
= ceph_mdsc_do_request(mdsc
, NULL
, req
);
322 ceph_mdsc_put_request(req
);
325 dout("readdir got and parsed readdir result=%d"
326 " on frag %x, end=%d, complete=%d\n", err
, frag
,
327 (int)req
->r_reply_info
.dir_end
,
328 (int)req
->r_reply_info
.dir_complete
);
330 if (!req
->r_did_prepopulate
) {
331 dout("readdir !did_prepopulate");
332 fi
->dir_release_count
--; /* preclude I_COMPLETE */
335 /* note next offset and last dentry name */
336 fi
->offset
= fi
->next_offset
;
337 fi
->last_readdir
= req
;
339 if (req
->r_reply_info
.dir_end
) {
340 kfree(fi
->last_name
);
341 fi
->last_name
= NULL
;
342 if (ceph_frag_is_rightmost(frag
))
347 rinfo
= &req
->r_reply_info
;
348 err
= note_last_dentry(fi
,
349 rinfo
->dir_dname
[rinfo
->dir_nr
-1],
350 rinfo
->dir_dname_len
[rinfo
->dir_nr
-1]);
353 fi
->next_offset
+= rinfo
->dir_nr
;
357 rinfo
= &fi
->last_readdir
->r_reply_info
;
358 dout("readdir frag %x num %d off %d chunkoff %d\n", frag
,
359 rinfo
->dir_nr
, off
, fi
->offset
);
360 while (off
- fi
->offset
>= 0 && off
- fi
->offset
< rinfo
->dir_nr
) {
361 u64 pos
= ceph_make_fpos(frag
, off
);
362 struct ceph_mds_reply_inode
*in
=
363 rinfo
->dir_in
[off
- fi
->offset
].in
;
364 struct ceph_vino vino
;
367 dout("readdir off %d (%d/%d) -> %lld '%.*s' %p\n",
368 off
, off
- fi
->offset
, rinfo
->dir_nr
, pos
,
369 rinfo
->dir_dname_len
[off
- fi
->offset
],
370 rinfo
->dir_dname
[off
- fi
->offset
], in
);
372 ftype
= le32_to_cpu(in
->mode
) >> 12;
373 vino
.ino
= le64_to_cpu(in
->ino
);
374 vino
.snap
= le64_to_cpu(in
->snapid
);
375 ino
= ceph_vino_to_ino(vino
);
377 rinfo
->dir_dname
[off
- fi
->offset
],
378 rinfo
->dir_dname_len
[off
- fi
->offset
],
379 pos
, ino
, ftype
) < 0) {
380 dout("filldir stopping us...\n");
384 filp
->f_pos
= pos
+ 1;
388 ceph_mdsc_put_request(fi
->last_readdir
);
389 fi
->last_readdir
= NULL
;
394 if (!ceph_frag_is_rightmost(frag
)) {
395 frag
= ceph_frag_next(frag
);
397 filp
->f_pos
= ceph_make_fpos(frag
, off
);
398 dout("readdir next frag is %x\n", frag
);
404 * if dir_release_count still matches the dir, no dentries
405 * were released during the whole readdir, and we should have
406 * the complete dir contents in our cache.
408 spin_lock(&inode
->i_lock
);
409 if (ci
->i_release_count
== fi
->dir_release_count
) {
410 dout(" marking %p complete\n", inode
);
411 ci
->i_ceph_flags
|= CEPH_I_COMPLETE
;
412 ci
->i_max_offset
= filp
->f_pos
;
414 spin_unlock(&inode
->i_lock
);
416 dout("readdir %p filp %p done.\n", inode
, filp
);
420 static void reset_readdir(struct ceph_file_info
*fi
)
422 if (fi
->last_readdir
) {
423 ceph_mdsc_put_request(fi
->last_readdir
);
424 fi
->last_readdir
= NULL
;
426 kfree(fi
->last_name
);
427 fi
->last_name
= NULL
;
428 fi
->next_offset
= 2; /* compensate for . and .. */
436 static loff_t
ceph_dir_llseek(struct file
*file
, loff_t offset
, int origin
)
438 struct ceph_file_info
*fi
= file
->private_data
;
439 struct inode
*inode
= file
->f_mapping
->host
;
440 loff_t old_offset
= offset
;
443 mutex_lock(&inode
->i_mutex
);
446 offset
+= inode
->i_size
+ 2; /* FIXME */
449 offset
+= file
->f_pos
;
452 if (offset
>= 0 && offset
<= inode
->i_sb
->s_maxbytes
) {
453 if (offset
!= file
->f_pos
) {
454 file
->f_pos
= offset
;
461 * discard buffered readdir content on seekdir(0), or
462 * seek to new frag, or seek prior to current chunk.
465 fpos_frag(offset
) != fpos_frag(old_offset
) ||
466 fpos_off(offset
) < fi
->offset
) {
467 dout("dir_llseek dropping %p content\n", file
);
471 /* bump dir_release_count if we did a forward seek */
472 if (offset
> old_offset
)
473 fi
->dir_release_count
--;
475 mutex_unlock(&inode
->i_mutex
);
480 * Process result of a lookup/open request.
482 * Mainly, make sure we return the final req->r_dentry (if it already
483 * existed) in place of the original VFS-provided dentry when they
486 * Gracefully handle the case where the MDS replies with -ENOENT and
487 * no trace (which it may do, at its discretion, e.g., if it doesn't
488 * care to issue a lease on the negative dentry).
490 struct dentry
*ceph_finish_lookup(struct ceph_mds_request
*req
,
491 struct dentry
*dentry
, int err
)
493 struct ceph_fs_client
*fsc
= ceph_sb_to_client(dentry
->d_sb
);
494 struct inode
*parent
= dentry
->d_parent
->d_inode
;
497 if (err
== -ENOENT
&&
498 strcmp(dentry
->d_name
.name
,
499 fsc
->mount_options
->snapdir_name
) == 0) {
500 struct inode
*inode
= ceph_get_snapdir(parent
);
501 dout("ENOENT on snapdir %p '%.*s', linking to snapdir %p\n",
502 dentry
, dentry
->d_name
.len
, dentry
->d_name
.name
, inode
);
503 BUG_ON(!d_unhashed(dentry
));
504 d_add(dentry
, inode
);
508 if (err
== -ENOENT
) {
511 if (!req
->r_reply_info
.head
->is_dentry
) {
512 dout("ENOENT and no trace, dentry %p inode %p\n",
513 dentry
, dentry
->d_inode
);
514 if (dentry
->d_inode
) {
523 dentry
= ERR_PTR(err
);
524 else if (dentry
!= req
->r_dentry
)
525 dentry
= dget(req
->r_dentry
); /* we got spliced */
531 static int is_root_ceph_dentry(struct inode
*inode
, struct dentry
*dentry
)
533 return ceph_ino(inode
) == CEPH_INO_ROOT
&&
534 strncmp(dentry
->d_name
.name
, ".ceph", 5) == 0;
538 * Look up a single dir entry. If there is a lookup intent, inform
539 * the MDS so that it gets our 'caps wanted' value in a single op.
541 static struct dentry
*ceph_lookup(struct inode
*dir
, struct dentry
*dentry
,
542 struct nameidata
*nd
)
544 struct ceph_fs_client
*fsc
= ceph_sb_to_client(dir
->i_sb
);
545 struct ceph_mds_client
*mdsc
= fsc
->mdsc
;
546 struct ceph_mds_request
*req
;
550 dout("lookup %p dentry %p '%.*s'\n",
551 dir
, dentry
, dentry
->d_name
.len
, dentry
->d_name
.name
);
553 if (dentry
->d_name
.len
> NAME_MAX
)
554 return ERR_PTR(-ENAMETOOLONG
);
556 err
= ceph_init_dentry(dentry
);
560 /* open (but not create!) intent? */
562 (nd
->flags
& LOOKUP_OPEN
) &&
563 (nd
->flags
& LOOKUP_CONTINUE
) == 0 && /* only open last component */
564 !(nd
->intent
.open
.flags
& O_CREAT
)) {
565 int mode
= nd
->intent
.open
.create_mode
& ~current
->fs
->umask
;
566 return ceph_lookup_open(dir
, dentry
, nd
, mode
, 1);
569 /* can we conclude ENOENT locally? */
570 if (dentry
->d_inode
== NULL
) {
571 struct ceph_inode_info
*ci
= ceph_inode(dir
);
572 struct ceph_dentry_info
*di
= ceph_dentry(dentry
);
574 spin_lock(&dir
->i_lock
);
575 dout(" dir %p flags are %d\n", dir
, ci
->i_ceph_flags
);
576 if (strncmp(dentry
->d_name
.name
,
577 fsc
->mount_options
->snapdir_name
,
578 dentry
->d_name
.len
) &&
579 !is_root_ceph_dentry(dir
, dentry
) &&
580 (ci
->i_ceph_flags
& CEPH_I_COMPLETE
) &&
581 (__ceph_caps_issued_mask(ci
, CEPH_CAP_FILE_SHARED
, 1))) {
582 spin_unlock(&dir
->i_lock
);
583 dout(" dir %p complete, -ENOENT\n", dir
);
585 di
->lease_shared_gen
= ci
->i_shared_gen
;
588 spin_unlock(&dir
->i_lock
);
591 op
= ceph_snap(dir
) == CEPH_SNAPDIR
?
592 CEPH_MDS_OP_LOOKUPSNAP
: CEPH_MDS_OP_LOOKUP
;
593 req
= ceph_mdsc_create_request(mdsc
, op
, USE_ANY_MDS
);
595 return ERR_CAST(req
);
596 req
->r_dentry
= dget(dentry
);
598 /* we only need inode linkage */
599 req
->r_args
.getattr
.mask
= cpu_to_le32(CEPH_STAT_CAP_INODE
);
600 req
->r_locked_dir
= dir
;
601 err
= ceph_mdsc_do_request(mdsc
, NULL
, req
);
602 dentry
= ceph_finish_lookup(req
, dentry
, err
);
603 ceph_mdsc_put_request(req
); /* will dput(dentry) */
604 dout("lookup result=%p\n", dentry
);
609 * If we do a create but get no trace back from the MDS, follow up with
610 * a lookup (the VFS expects us to link up the provided dentry).
612 int ceph_handle_notrace_create(struct inode
*dir
, struct dentry
*dentry
)
614 struct dentry
*result
= ceph_lookup(dir
, dentry
, NULL
);
616 if (result
&& !IS_ERR(result
)) {
618 * We created the item, then did a lookup, and found
619 * it was already linked to another inode we already
620 * had in our cache (and thus got spliced). Link our
621 * dentry to that inode, but don't hash it, just in
622 * case the VFS wants to dereference it.
624 BUG_ON(!result
->d_inode
);
625 d_instantiate(dentry
, result
->d_inode
);
628 return PTR_ERR(result
);
631 static int ceph_mknod(struct inode
*dir
, struct dentry
*dentry
,
632 int mode
, dev_t rdev
)
634 struct ceph_fs_client
*fsc
= ceph_sb_to_client(dir
->i_sb
);
635 struct ceph_mds_client
*mdsc
= fsc
->mdsc
;
636 struct ceph_mds_request
*req
;
639 if (ceph_snap(dir
) != CEPH_NOSNAP
)
642 dout("mknod in dir %p dentry %p mode 0%o rdev %d\n",
643 dir
, dentry
, mode
, rdev
);
644 req
= ceph_mdsc_create_request(mdsc
, CEPH_MDS_OP_MKNOD
, USE_AUTH_MDS
);
649 req
->r_dentry
= dget(dentry
);
651 req
->r_locked_dir
= dir
;
652 req
->r_args
.mknod
.mode
= cpu_to_le32(mode
);
653 req
->r_args
.mknod
.rdev
= cpu_to_le32(rdev
);
654 req
->r_dentry_drop
= CEPH_CAP_FILE_SHARED
;
655 req
->r_dentry_unless
= CEPH_CAP_FILE_EXCL
;
656 err
= ceph_mdsc_do_request(mdsc
, dir
, req
);
657 if (!err
&& !req
->r_reply_info
.head
->is_dentry
)
658 err
= ceph_handle_notrace_create(dir
, dentry
);
659 ceph_mdsc_put_request(req
);
665 static int ceph_create(struct inode
*dir
, struct dentry
*dentry
, int mode
,
666 struct nameidata
*nd
)
668 dout("create in dir %p dentry %p name '%.*s'\n",
669 dir
, dentry
, dentry
->d_name
.len
, dentry
->d_name
.name
);
671 if (ceph_snap(dir
) != CEPH_NOSNAP
)
675 BUG_ON((nd
->flags
& LOOKUP_OPEN
) == 0);
676 dentry
= ceph_lookup_open(dir
, dentry
, nd
, mode
, 0);
677 /* hrm, what should i do here if we get aliased? */
679 return PTR_ERR(dentry
);
683 /* fall back to mknod */
684 return ceph_mknod(dir
, dentry
, (mode
& ~S_IFMT
) | S_IFREG
, 0);
687 static int ceph_symlink(struct inode
*dir
, struct dentry
*dentry
,
690 struct ceph_fs_client
*fsc
= ceph_sb_to_client(dir
->i_sb
);
691 struct ceph_mds_client
*mdsc
= fsc
->mdsc
;
692 struct ceph_mds_request
*req
;
695 if (ceph_snap(dir
) != CEPH_NOSNAP
)
698 dout("symlink in dir %p dentry %p to '%s'\n", dir
, dentry
, dest
);
699 req
= ceph_mdsc_create_request(mdsc
, CEPH_MDS_OP_SYMLINK
, USE_AUTH_MDS
);
704 req
->r_dentry
= dget(dentry
);
706 req
->r_path2
= kstrdup(dest
, GFP_NOFS
);
707 req
->r_locked_dir
= dir
;
708 req
->r_dentry_drop
= CEPH_CAP_FILE_SHARED
;
709 req
->r_dentry_unless
= CEPH_CAP_FILE_EXCL
;
710 err
= ceph_mdsc_do_request(mdsc
, dir
, req
);
711 if (!err
&& !req
->r_reply_info
.head
->is_dentry
)
712 err
= ceph_handle_notrace_create(dir
, dentry
);
713 ceph_mdsc_put_request(req
);
719 static int ceph_mkdir(struct inode
*dir
, struct dentry
*dentry
, int mode
)
721 struct ceph_fs_client
*fsc
= ceph_sb_to_client(dir
->i_sb
);
722 struct ceph_mds_client
*mdsc
= fsc
->mdsc
;
723 struct ceph_mds_request
*req
;
727 if (ceph_snap(dir
) == CEPH_SNAPDIR
) {
728 /* mkdir .snap/foo is a MKSNAP */
729 op
= CEPH_MDS_OP_MKSNAP
;
730 dout("mksnap dir %p snap '%.*s' dn %p\n", dir
,
731 dentry
->d_name
.len
, dentry
->d_name
.name
, dentry
);
732 } else if (ceph_snap(dir
) == CEPH_NOSNAP
) {
733 dout("mkdir dir %p dn %p mode 0%o\n", dir
, dentry
, mode
);
734 op
= CEPH_MDS_OP_MKDIR
;
738 req
= ceph_mdsc_create_request(mdsc
, op
, USE_AUTH_MDS
);
744 req
->r_dentry
= dget(dentry
);
746 req
->r_locked_dir
= dir
;
747 req
->r_args
.mkdir
.mode
= cpu_to_le32(mode
);
748 req
->r_dentry_drop
= CEPH_CAP_FILE_SHARED
;
749 req
->r_dentry_unless
= CEPH_CAP_FILE_EXCL
;
750 err
= ceph_mdsc_do_request(mdsc
, dir
, req
);
751 if (!err
&& !req
->r_reply_info
.head
->is_dentry
)
752 err
= ceph_handle_notrace_create(dir
, dentry
);
753 ceph_mdsc_put_request(req
);
760 static int ceph_link(struct dentry
*old_dentry
, struct inode
*dir
,
761 struct dentry
*dentry
)
763 struct ceph_fs_client
*fsc
= ceph_sb_to_client(dir
->i_sb
);
764 struct ceph_mds_client
*mdsc
= fsc
->mdsc
;
765 struct ceph_mds_request
*req
;
768 if (ceph_snap(dir
) != CEPH_NOSNAP
)
771 dout("link in dir %p old_dentry %p dentry %p\n", dir
,
773 req
= ceph_mdsc_create_request(mdsc
, CEPH_MDS_OP_LINK
, USE_AUTH_MDS
);
778 req
->r_dentry
= dget(dentry
);
780 req
->r_old_dentry
= dget(old_dentry
); /* or inode? hrm. */
781 req
->r_locked_dir
= dir
;
782 req
->r_dentry_drop
= CEPH_CAP_FILE_SHARED
;
783 req
->r_dentry_unless
= CEPH_CAP_FILE_EXCL
;
784 err
= ceph_mdsc_do_request(mdsc
, dir
, req
);
787 else if (!req
->r_reply_info
.head
->is_dentry
)
788 d_instantiate(dentry
, igrab(old_dentry
->d_inode
));
789 ceph_mdsc_put_request(req
);
794 * For a soon-to-be unlinked file, drop the AUTH_RDCACHE caps. If it
795 * looks like the link count will hit 0, drop any other caps (other
796 * than PIN) we don't specifically want (due to the file still being
799 static int drop_caps_for_unlink(struct inode
*inode
)
801 struct ceph_inode_info
*ci
= ceph_inode(inode
);
802 int drop
= CEPH_CAP_LINK_SHARED
| CEPH_CAP_LINK_EXCL
;
804 spin_lock(&inode
->i_lock
);
805 if (inode
->i_nlink
== 1) {
806 drop
|= ~(__ceph_caps_wanted(ci
) | CEPH_CAP_PIN
);
807 ci
->i_ceph_flags
|= CEPH_I_NODELAY
;
809 spin_unlock(&inode
->i_lock
);
814 * rmdir and unlink are differ only by the metadata op code
816 static int ceph_unlink(struct inode
*dir
, struct dentry
*dentry
)
818 struct ceph_fs_client
*fsc
= ceph_sb_to_client(dir
->i_sb
);
819 struct ceph_mds_client
*mdsc
= fsc
->mdsc
;
820 struct inode
*inode
= dentry
->d_inode
;
821 struct ceph_mds_request
*req
;
825 if (ceph_snap(dir
) == CEPH_SNAPDIR
) {
826 /* rmdir .snap/foo is RMSNAP */
827 dout("rmsnap dir %p '%.*s' dn %p\n", dir
, dentry
->d_name
.len
,
828 dentry
->d_name
.name
, dentry
);
829 op
= CEPH_MDS_OP_RMSNAP
;
830 } else if (ceph_snap(dir
) == CEPH_NOSNAP
) {
831 dout("unlink/rmdir dir %p dn %p inode %p\n",
833 op
= ((dentry
->d_inode
->i_mode
& S_IFMT
) == S_IFDIR
) ?
834 CEPH_MDS_OP_RMDIR
: CEPH_MDS_OP_UNLINK
;
837 req
= ceph_mdsc_create_request(mdsc
, op
, USE_AUTH_MDS
);
842 req
->r_dentry
= dget(dentry
);
844 req
->r_locked_dir
= dir
;
845 req
->r_dentry_drop
= CEPH_CAP_FILE_SHARED
;
846 req
->r_dentry_unless
= CEPH_CAP_FILE_EXCL
;
847 req
->r_inode_drop
= drop_caps_for_unlink(inode
);
848 err
= ceph_mdsc_do_request(mdsc
, dir
, req
);
849 if (!err
&& !req
->r_reply_info
.head
->is_dentry
)
851 ceph_mdsc_put_request(req
);
856 static int ceph_rename(struct inode
*old_dir
, struct dentry
*old_dentry
,
857 struct inode
*new_dir
, struct dentry
*new_dentry
)
859 struct ceph_fs_client
*fsc
= ceph_sb_to_client(old_dir
->i_sb
);
860 struct ceph_mds_client
*mdsc
= fsc
->mdsc
;
861 struct ceph_mds_request
*req
;
864 if (ceph_snap(old_dir
) != ceph_snap(new_dir
))
866 if (ceph_snap(old_dir
) != CEPH_NOSNAP
||
867 ceph_snap(new_dir
) != CEPH_NOSNAP
)
869 dout("rename dir %p dentry %p to dir %p dentry %p\n",
870 old_dir
, old_dentry
, new_dir
, new_dentry
);
871 req
= ceph_mdsc_create_request(mdsc
, CEPH_MDS_OP_RENAME
, USE_AUTH_MDS
);
874 req
->r_dentry
= dget(new_dentry
);
876 req
->r_old_dentry
= dget(old_dentry
);
877 req
->r_locked_dir
= new_dir
;
878 req
->r_old_dentry_drop
= CEPH_CAP_FILE_SHARED
;
879 req
->r_old_dentry_unless
= CEPH_CAP_FILE_EXCL
;
880 req
->r_dentry_drop
= CEPH_CAP_FILE_SHARED
;
881 req
->r_dentry_unless
= CEPH_CAP_FILE_EXCL
;
882 /* release LINK_RDCACHE on source inode (mds will lock it) */
883 req
->r_old_inode_drop
= CEPH_CAP_LINK_SHARED
;
884 if (new_dentry
->d_inode
)
885 req
->r_inode_drop
= drop_caps_for_unlink(new_dentry
->d_inode
);
886 err
= ceph_mdsc_do_request(mdsc
, old_dir
, req
);
887 if (!err
&& !req
->r_reply_info
.head
->is_dentry
) {
889 * Normally d_move() is done by fill_trace (called by
890 * do_request, above). If there is no trace, we need
894 /* d_move screws up d_subdirs order */
895 ceph_i_clear(new_dir
, CEPH_I_COMPLETE
);
897 d_move(old_dentry
, new_dentry
);
899 /* ensure target dentry is invalidated, despite
900 rehashing bug in vfs_rename_dir */
901 ceph_invalidate_dentry_lease(new_dentry
);
903 ceph_mdsc_put_request(req
);
908 * Ensure a dentry lease will no longer revalidate.
910 void ceph_invalidate_dentry_lease(struct dentry
*dentry
)
912 spin_lock(&dentry
->d_lock
);
913 dentry
->d_time
= jiffies
;
914 ceph_dentry(dentry
)->lease_shared_gen
= 0;
915 spin_unlock(&dentry
->d_lock
);
919 * Check if dentry lease is valid. If not, delete the lease. Try to
920 * renew if the least is more than half up.
922 static int dentry_lease_is_valid(struct dentry
*dentry
)
924 struct ceph_dentry_info
*di
;
925 struct ceph_mds_session
*s
;
929 struct ceph_mds_session
*session
= NULL
;
930 struct inode
*dir
= NULL
;
933 spin_lock(&dentry
->d_lock
);
934 di
= ceph_dentry(dentry
);
935 if (di
&& di
->lease_session
) {
936 s
= di
->lease_session
;
937 spin_lock(&s
->s_cap_lock
);
940 spin_unlock(&s
->s_cap_lock
);
942 if (di
->lease_gen
== gen
&&
943 time_before(jiffies
, dentry
->d_time
) &&
944 time_before(jiffies
, ttl
)) {
946 if (di
->lease_renew_after
&&
947 time_after(jiffies
, di
->lease_renew_after
)) {
948 /* we should renew */
949 dir
= dentry
->d_parent
->d_inode
;
950 session
= ceph_get_mds_session(s
);
952 di
->lease_renew_after
= 0;
953 di
->lease_renew_from
= jiffies
;
957 spin_unlock(&dentry
->d_lock
);
960 ceph_mdsc_lease_send_msg(session
, dir
, dentry
,
961 CEPH_MDS_LEASE_RENEW
, seq
);
962 ceph_put_mds_session(session
);
964 dout("dentry_lease_is_valid - dentry %p = %d\n", dentry
, valid
);
969 * Check if directory-wide content lease/cap is valid.
971 static int dir_lease_is_valid(struct inode
*dir
, struct dentry
*dentry
)
973 struct ceph_inode_info
*ci
= ceph_inode(dir
);
974 struct ceph_dentry_info
*di
= ceph_dentry(dentry
);
977 spin_lock(&dir
->i_lock
);
978 if (ci
->i_shared_gen
== di
->lease_shared_gen
)
979 valid
= __ceph_caps_issued_mask(ci
, CEPH_CAP_FILE_SHARED
, 1);
980 spin_unlock(&dir
->i_lock
);
981 dout("dir_lease_is_valid dir %p v%u dentry %p v%u = %d\n",
982 dir
, (unsigned)ci
->i_shared_gen
, dentry
,
983 (unsigned)di
->lease_shared_gen
, valid
);
988 * Check if cached dentry can be trusted.
990 static int ceph_d_revalidate(struct dentry
*dentry
, struct nameidata
*nd
)
992 struct inode
*dir
= dentry
->d_parent
->d_inode
;
994 dout("d_revalidate %p '%.*s' inode %p offset %lld\n", dentry
,
995 dentry
->d_name
.len
, dentry
->d_name
.name
, dentry
->d_inode
,
996 ceph_dentry(dentry
)->offset
);
998 /* always trust cached snapped dentries, snapdir dentry */
999 if (ceph_snap(dir
) != CEPH_NOSNAP
) {
1000 dout("d_revalidate %p '%.*s' inode %p is SNAPPED\n", dentry
,
1001 dentry
->d_name
.len
, dentry
->d_name
.name
, dentry
->d_inode
);
1004 if (dentry
->d_inode
&& ceph_snap(dentry
->d_inode
) == CEPH_SNAPDIR
)
1007 if (dentry_lease_is_valid(dentry
) ||
1008 dir_lease_is_valid(dir
, dentry
))
1011 dout("d_revalidate %p invalid\n", dentry
);
1015 ceph_dentry_lru_touch(dentry
);
1020 * When a dentry is released, clear the dir I_COMPLETE if it was part
1021 * of the current dir gen or if this is in the snapshot namespace.
1023 static void ceph_dentry_release(struct dentry
*dentry
)
1025 struct ceph_dentry_info
*di
= ceph_dentry(dentry
);
1026 struct inode
*parent_inode
= NULL
;
1027 u64 snapid
= CEPH_NOSNAP
;
1029 if (!IS_ROOT(dentry
)) {
1030 parent_inode
= dentry
->d_parent
->d_inode
;
1032 snapid
= ceph_snap(parent_inode
);
1034 dout("dentry_release %p parent %p\n", dentry
, parent_inode
);
1035 if (parent_inode
&& snapid
!= CEPH_SNAPDIR
) {
1036 struct ceph_inode_info
*ci
= ceph_inode(parent_inode
);
1038 spin_lock(&parent_inode
->i_lock
);
1039 if (ci
->i_shared_gen
== di
->lease_shared_gen
||
1040 snapid
<= CEPH_MAXSNAP
) {
1041 dout(" clearing %p complete (d_release)\n",
1043 ci
->i_ceph_flags
&= ~CEPH_I_COMPLETE
;
1044 ci
->i_release_count
++;
1046 spin_unlock(&parent_inode
->i_lock
);
1049 ceph_dentry_lru_del(dentry
);
1050 if (di
->lease_session
)
1051 ceph_put_mds_session(di
->lease_session
);
1052 kmem_cache_free(ceph_dentry_cachep
, di
);
1053 dentry
->d_fsdata
= NULL
;
1057 static int ceph_snapdir_d_revalidate(struct dentry
*dentry
,
1058 struct nameidata
*nd
)
1061 * Eventually, we'll want to revalidate snapped metadata
1062 * too... probably...
1070 * read() on a dir. This weird interface hack only works if mounted
1071 * with '-o dirstat'.
1073 static ssize_t
ceph_read_dir(struct file
*file
, char __user
*buf
, size_t size
,
1076 struct ceph_file_info
*cf
= file
->private_data
;
1077 struct inode
*inode
= file
->f_dentry
->d_inode
;
1078 struct ceph_inode_info
*ci
= ceph_inode(inode
);
1081 if (!ceph_test_mount_opt(ceph_sb_to_client(inode
->i_sb
), DIRSTAT
))
1084 if (!cf
->dir_info
) {
1085 cf
->dir_info
= kmalloc(1024, GFP_NOFS
);
1089 sprintf(cf
->dir_info
,
1092 " subdirs: %20lld\n"
1093 "rentries: %20lld\n"
1095 " rsubdirs: %20lld\n"
1097 "rctime: %10ld.%09ld\n",
1098 ci
->i_files
+ ci
->i_subdirs
,
1101 ci
->i_rfiles
+ ci
->i_rsubdirs
,
1105 (long)ci
->i_rctime
.tv_sec
,
1106 (long)ci
->i_rctime
.tv_nsec
);
1109 if (*ppos
>= cf
->dir_info_len
)
1111 size
= min_t(unsigned, size
, cf
->dir_info_len
-*ppos
);
1112 left
= copy_to_user(buf
, cf
->dir_info
+ *ppos
, size
);
1115 *ppos
+= (size
- left
);
1120 * an fsync() on a dir will wait for any uncommitted directory
1121 * operations to commit.
1123 static int ceph_dir_fsync(struct file
*file
, int datasync
)
1125 struct inode
*inode
= file
->f_path
.dentry
->d_inode
;
1126 struct ceph_inode_info
*ci
= ceph_inode(inode
);
1127 struct list_head
*head
= &ci
->i_unsafe_dirops
;
1128 struct ceph_mds_request
*req
;
1132 dout("dir_fsync %p\n", inode
);
1133 spin_lock(&ci
->i_unsafe_lock
);
1134 if (list_empty(head
))
1137 req
= list_entry(head
->prev
,
1138 struct ceph_mds_request
, r_unsafe_dir_item
);
1139 last_tid
= req
->r_tid
;
1142 ceph_mdsc_get_request(req
);
1143 spin_unlock(&ci
->i_unsafe_lock
);
1144 dout("dir_fsync %p wait on tid %llu (until %llu)\n",
1145 inode
, req
->r_tid
, last_tid
);
1146 if (req
->r_timeout
) {
1147 ret
= wait_for_completion_timeout(
1148 &req
->r_safe_completion
, req
->r_timeout
);
1152 ret
= -EIO
; /* timed out */
1154 wait_for_completion(&req
->r_safe_completion
);
1156 spin_lock(&ci
->i_unsafe_lock
);
1157 ceph_mdsc_put_request(req
);
1159 if (ret
|| list_empty(head
))
1161 req
= list_entry(head
->next
,
1162 struct ceph_mds_request
, r_unsafe_dir_item
);
1163 } while (req
->r_tid
< last_tid
);
1165 spin_unlock(&ci
->i_unsafe_lock
);
1170 * We maintain a private dentry LRU.
1172 * FIXME: this needs to be changed to a per-mds lru to be useful.
1174 void ceph_dentry_lru_add(struct dentry
*dn
)
1176 struct ceph_dentry_info
*di
= ceph_dentry(dn
);
1177 struct ceph_mds_client
*mdsc
;
1179 dout("dentry_lru_add %p %p '%.*s'\n", di
, dn
,
1180 dn
->d_name
.len
, dn
->d_name
.name
);
1182 mdsc
= ceph_sb_to_client(dn
->d_sb
)->mdsc
;
1183 spin_lock(&mdsc
->dentry_lru_lock
);
1184 list_add_tail(&di
->lru
, &mdsc
->dentry_lru
);
1186 spin_unlock(&mdsc
->dentry_lru_lock
);
1190 void ceph_dentry_lru_touch(struct dentry
*dn
)
1192 struct ceph_dentry_info
*di
= ceph_dentry(dn
);
1193 struct ceph_mds_client
*mdsc
;
1195 dout("dentry_lru_touch %p %p '%.*s' (offset %lld)\n", di
, dn
,
1196 dn
->d_name
.len
, dn
->d_name
.name
, di
->offset
);
1198 mdsc
= ceph_sb_to_client(dn
->d_sb
)->mdsc
;
1199 spin_lock(&mdsc
->dentry_lru_lock
);
1200 list_move_tail(&di
->lru
, &mdsc
->dentry_lru
);
1201 spin_unlock(&mdsc
->dentry_lru_lock
);
1205 void ceph_dentry_lru_del(struct dentry
*dn
)
1207 struct ceph_dentry_info
*di
= ceph_dentry(dn
);
1208 struct ceph_mds_client
*mdsc
;
1210 dout("dentry_lru_del %p %p '%.*s'\n", di
, dn
,
1211 dn
->d_name
.len
, dn
->d_name
.name
);
1213 mdsc
= ceph_sb_to_client(dn
->d_sb
)->mdsc
;
1214 spin_lock(&mdsc
->dentry_lru_lock
);
1215 list_del_init(&di
->lru
);
1217 spin_unlock(&mdsc
->dentry_lru_lock
);
1221 const struct file_operations ceph_dir_fops
= {
1222 .read
= ceph_read_dir
,
1223 .readdir
= ceph_readdir
,
1224 .llseek
= ceph_dir_llseek
,
1226 .release
= ceph_release
,
1227 .unlocked_ioctl
= ceph_ioctl
,
1228 .fsync
= ceph_dir_fsync
,
1231 const struct inode_operations ceph_dir_iops
= {
1232 .lookup
= ceph_lookup
,
1233 .permission
= ceph_permission
,
1234 .getattr
= ceph_getattr
,
1235 .setattr
= ceph_setattr
,
1236 .setxattr
= ceph_setxattr
,
1237 .getxattr
= ceph_getxattr
,
1238 .listxattr
= ceph_listxattr
,
1239 .removexattr
= ceph_removexattr
,
1240 .mknod
= ceph_mknod
,
1241 .symlink
= ceph_symlink
,
1242 .mkdir
= ceph_mkdir
,
1244 .unlink
= ceph_unlink
,
1245 .rmdir
= ceph_unlink
,
1246 .rename
= ceph_rename
,
1247 .create
= ceph_create
,
1250 const struct dentry_operations ceph_dentry_ops
= {
1251 .d_revalidate
= ceph_d_revalidate
,
1252 .d_release
= ceph_dentry_release
,
1255 const struct dentry_operations ceph_snapdir_dentry_ops
= {
1256 .d_revalidate
= ceph_snapdir_d_revalidate
,
1257 .d_release
= ceph_dentry_release
,
1260 const struct dentry_operations ceph_snap_dentry_ops
= {
1261 .d_release
= ceph_dentry_release
,