1 #include "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>
12 * Directory operations: readdir, lookup, create, link, unlink,
17 * Ceph MDS operations are specified in terms of a base ino and
18 * relative path. Thus, the client can specify an operation on a
19 * specific inode (e.g., a getattr due to fstat(2)), or as a path
20 * relative to, say, the root directory.
22 * Normally, we limit ourselves to strict inode ops (no path component)
23 * or dentry operations (a single path component relative to an ino). The
24 * exception to this is open_root_dentry(), which will open the mount
28 const struct inode_operations ceph_dir_iops
;
29 const struct file_operations ceph_dir_fops
;
30 struct dentry_operations ceph_dentry_ops
;
33 * Initialize ceph dentry state.
35 int ceph_init_dentry(struct dentry
*dentry
)
37 struct ceph_dentry_info
*di
;
42 if (ceph_snap(dentry
->d_parent
->d_inode
) == CEPH_NOSNAP
)
43 dentry
->d_op
= &ceph_dentry_ops
;
44 else if (ceph_snap(dentry
->d_parent
->d_inode
) == CEPH_SNAPDIR
)
45 dentry
->d_op
= &ceph_snapdir_dentry_ops
;
47 dentry
->d_op
= &ceph_snap_dentry_ops
;
49 di
= kmem_cache_alloc(ceph_dentry_cachep
, GFP_NOFS
);
51 return -ENOMEM
; /* oh well */
53 spin_lock(&dentry
->d_lock
);
54 if (dentry
->d_fsdata
) {
56 kmem_cache_free(ceph_dentry_cachep
, di
);
60 di
->lease_session
= NULL
;
61 dentry
->d_fsdata
= di
;
62 dentry
->d_time
= jiffies
;
63 ceph_dentry_lru_add(dentry
);
65 spin_unlock(&dentry
->d_lock
);
72 * for readdir, we encode the directory frag and offset within that
75 static unsigned fpos_frag(loff_t p
)
79 static unsigned fpos_off(loff_t p
)
81 return p
& 0xffffffff;
85 * When possible, we try to satisfy a readdir by peeking at the
86 * dcache. We make this work by carefully ordering dentries on
87 * d_u.d_child when we initially get results back from the MDS, and
88 * falling back to a "normal" sync readdir if any dentries in the dir
91 * I_COMPLETE tells indicates we have all dentries in the dir. It is
92 * defined IFF we hold CEPH_CAP_FILE_SHARED (which will be revoked by
93 * the MDS if/when the directory is modified).
95 static int __dcache_readdir(struct file
*filp
,
96 void *dirent
, filldir_t filldir
)
98 struct inode
*inode
= filp
->f_dentry
->d_inode
;
99 struct ceph_file_info
*fi
= filp
->private_data
;
100 struct dentry
*parent
= filp
->f_dentry
;
101 struct inode
*dir
= parent
->d_inode
;
103 struct dentry
*dentry
, *last
;
104 struct ceph_dentry_info
*di
;
107 /* claim ref on last dentry we returned */
111 dout("__dcache_readdir %p at %llu (last %p)\n", dir
, filp
->f_pos
,
114 spin_lock(&dcache_lock
);
116 /* start at beginning? */
117 if (filp
->f_pos
== 2 || (last
&&
118 filp
->f_pos
< ceph_dentry(last
)->offset
)) {
119 if (list_empty(&parent
->d_subdirs
))
121 p
= parent
->d_subdirs
.prev
;
122 dout(" initial p %p/%p\n", p
->prev
, p
->next
);
124 p
= last
->d_u
.d_child
.prev
;
128 dentry
= list_entry(p
, struct dentry
, d_u
.d_child
);
129 di
= ceph_dentry(dentry
);
131 dout(" p %p/%p %s d_subdirs %p/%p\n", p
->prev
, p
->next
,
132 d_unhashed(dentry
) ? "!hashed" : "hashed",
133 parent
->d_subdirs
.prev
, parent
->d_subdirs
.next
);
134 if (p
== &parent
->d_subdirs
) {
138 if (!d_unhashed(dentry
) && dentry
->d_inode
&&
139 ceph_snap(dentry
->d_inode
) != CEPH_SNAPDIR
&&
140 ceph_ino(dentry
->d_inode
) != CEPH_INO_CEPH
&&
141 filp
->f_pos
<= di
->offset
)
143 dout(" skipping %p %.*s at %llu (%llu)%s%s\n", dentry
,
144 dentry
->d_name
.len
, dentry
->d_name
.name
, di
->offset
,
145 filp
->f_pos
, d_unhashed(dentry
) ? " unhashed" : "",
146 !dentry
->d_inode
? " null" : "");
148 dentry
= list_entry(p
, struct dentry
, d_u
.d_child
);
149 di
= ceph_dentry(dentry
);
152 atomic_inc(&dentry
->d_count
);
153 spin_unlock(&dcache_lock
);
154 spin_unlock(&inode
->i_lock
);
156 dout(" %llu (%llu) dentry %p %.*s %p\n", di
->offset
, filp
->f_pos
,
157 dentry
, dentry
->d_name
.len
, dentry
->d_name
.name
, dentry
->d_inode
);
158 filp
->f_pos
= di
->offset
;
159 err
= filldir(dirent
, dentry
->d_name
.name
,
160 dentry
->d_name
.len
, di
->offset
,
161 dentry
->d_inode
->i_ino
,
162 dentry
->d_inode
->i_mode
>> 12);
166 /* remember our position */
168 fi
->next_offset
= di
->offset
;
175 spin_lock(&inode
->i_lock
);
176 spin_lock(&dcache_lock
);
186 /* make sure a dentry wasn't dropped while we didn't have dcache_lock */
187 if ((ceph_inode(dir
)->i_ceph_flags
& CEPH_I_COMPLETE
))
189 dout(" lost I_COMPLETE on %p; falling back to mds\n", dir
);
193 spin_unlock(&dcache_lock
);
196 spin_unlock(&inode
->i_lock
);
198 spin_lock(&inode
->i_lock
);
205 * make note of the last dentry we read, so we can
206 * continue at the same lexicographical point,
207 * regardless of what dir changes take place on the
210 static int note_last_dentry(struct ceph_file_info
*fi
, const char *name
,
213 kfree(fi
->last_name
);
214 fi
->last_name
= kmalloc(len
+1, GFP_NOFS
);
217 memcpy(fi
->last_name
, name
, len
);
218 fi
->last_name
[len
] = 0;
219 dout("note_last_dentry '%s'\n", fi
->last_name
);
223 static int ceph_readdir(struct file
*filp
, void *dirent
, filldir_t filldir
)
225 struct ceph_file_info
*fi
= filp
->private_data
;
226 struct inode
*inode
= filp
->f_dentry
->d_inode
;
227 struct ceph_inode_info
*ci
= ceph_inode(inode
);
228 struct ceph_client
*client
= ceph_inode_to_client(inode
);
229 struct ceph_mds_client
*mdsc
= &client
->mdsc
;
230 unsigned frag
= fpos_frag(filp
->f_pos
);
231 int off
= fpos_off(filp
->f_pos
);
234 struct ceph_mds_reply_info_parsed
*rinfo
;
235 const int max_entries
= client
->mount_args
->max_readdir
;
236 const int max_bytes
= client
->mount_args
->max_readdir_bytes
;
238 dout("readdir %p filp %p frag %u off %u\n", inode
, filp
, frag
, off
);
242 /* always start with . and .. */
243 if (filp
->f_pos
== 0) {
244 /* note dir version at start of readdir so we can tell
245 * if any dentries get dropped */
246 fi
->dir_release_count
= ci
->i_release_count
;
248 dout("readdir off 0 -> '.'\n");
249 if (filldir(dirent
, ".", 1, ceph_make_fpos(0, 0),
250 inode
->i_ino
, inode
->i_mode
>> 12) < 0)
255 if (filp
->f_pos
== 1) {
256 dout("readdir off 1 -> '..'\n");
257 if (filldir(dirent
, "..", 2, ceph_make_fpos(0, 1),
258 filp
->f_dentry
->d_parent
->d_inode
->i_ino
,
259 inode
->i_mode
>> 12) < 0)
265 /* can we use the dcache? */
266 spin_lock(&inode
->i_lock
);
267 if ((filp
->f_pos
== 2 || fi
->dentry
) &&
268 !ceph_test_opt(client
, NOASYNCREADDIR
) &&
269 (ci
->i_ceph_flags
& CEPH_I_COMPLETE
) &&
270 __ceph_caps_issued_mask(ci
, CEPH_CAP_FILE_SHARED
, 1)) {
271 err
= __dcache_readdir(filp
, dirent
, filldir
);
272 if (err
!= -EAGAIN
) {
273 spin_unlock(&inode
->i_lock
);
277 spin_unlock(&inode
->i_lock
);
279 err
= note_last_dentry(fi
, fi
->dentry
->d_name
.name
,
280 fi
->dentry
->d_name
.len
);
287 /* proceed with a normal readdir */
290 /* do we have the correct frag content buffered? */
291 if (fi
->frag
!= frag
|| fi
->last_readdir
== NULL
) {
292 struct ceph_mds_request
*req
;
293 int op
= ceph_snap(inode
) == CEPH_SNAPDIR
?
294 CEPH_MDS_OP_LSSNAP
: CEPH_MDS_OP_READDIR
;
296 /* discard old result, if any */
297 if (fi
->last_readdir
) {
298 ceph_mdsc_put_request(fi
->last_readdir
);
299 fi
->last_readdir
= NULL
;
302 /* requery frag tree, as the frag topology may have changed */
303 frag
= ceph_choose_frag(ceph_inode(inode
), frag
, NULL
, NULL
);
305 dout("readdir fetching %llx.%llx frag %x offset '%s'\n",
306 ceph_vinop(inode
), frag
, fi
->last_name
);
307 req
= ceph_mdsc_create_request(mdsc
, op
, USE_AUTH_MDS
);
310 req
->r_inode
= igrab(inode
);
311 req
->r_dentry
= dget(filp
->f_dentry
);
312 /* hints to request -> mds selection code */
313 req
->r_direct_mode
= USE_AUTH_MDS
;
314 req
->r_direct_hash
= ceph_frag_value(frag
);
315 req
->r_direct_is_hash
= true;
316 req
->r_path2
= kstrdup(fi
->last_name
, GFP_NOFS
);
317 req
->r_readdir_offset
= fi
->next_offset
;
318 req
->r_args
.readdir
.frag
= cpu_to_le32(frag
);
319 req
->r_args
.readdir
.max_entries
= cpu_to_le32(max_entries
);
320 req
->r_args
.readdir
.max_bytes
= cpu_to_le32(max_bytes
);
321 req
->r_num_caps
= max_entries
+ 1;
322 err
= ceph_mdsc_do_request(mdsc
, NULL
, req
);
324 ceph_mdsc_put_request(req
);
327 dout("readdir got and parsed readdir result=%d"
328 " on frag %x, end=%d, complete=%d\n", err
, frag
,
329 (int)req
->r_reply_info
.dir_end
,
330 (int)req
->r_reply_info
.dir_complete
);
332 if (!req
->r_did_prepopulate
) {
333 dout("readdir !did_prepopulate");
334 fi
->dir_release_count
--; /* preclude I_COMPLETE */
337 /* note next offset and last dentry name */
338 fi
->offset
= fi
->next_offset
;
339 fi
->last_readdir
= req
;
341 if (req
->r_reply_info
.dir_end
) {
342 kfree(fi
->last_name
);
343 fi
->last_name
= NULL
;
346 rinfo
= &req
->r_reply_info
;
347 err
= note_last_dentry(fi
,
348 rinfo
->dir_dname
[rinfo
->dir_nr
-1],
349 rinfo
->dir_dname_len
[rinfo
->dir_nr
-1]);
352 fi
->next_offset
+= rinfo
->dir_nr
;
356 rinfo
= &fi
->last_readdir
->r_reply_info
;
357 dout("readdir frag %x num %d off %d chunkoff %d\n", frag
,
358 rinfo
->dir_nr
, off
, fi
->offset
);
359 while (off
- fi
->offset
>= 0 && off
- fi
->offset
< rinfo
->dir_nr
) {
360 u64 pos
= ceph_make_fpos(frag
, off
);
361 struct ceph_mds_reply_inode
*in
=
362 rinfo
->dir_in
[off
- fi
->offset
].in
;
363 dout("readdir off %d (%d/%d) -> %lld '%.*s' %p\n",
364 off
, off
- fi
->offset
, rinfo
->dir_nr
, pos
,
365 rinfo
->dir_dname_len
[off
- fi
->offset
],
366 rinfo
->dir_dname
[off
- fi
->offset
], in
);
368 ftype
= le32_to_cpu(in
->mode
) >> 12;
370 rinfo
->dir_dname
[off
- fi
->offset
],
371 rinfo
->dir_dname_len
[off
- fi
->offset
],
373 le64_to_cpu(in
->ino
),
375 dout("filldir stopping us...\n");
379 filp
->f_pos
= pos
+ 1;
383 ceph_mdsc_put_request(fi
->last_readdir
);
384 fi
->last_readdir
= NULL
;
389 if (!ceph_frag_is_rightmost(frag
)) {
390 frag
= ceph_frag_next(frag
);
392 filp
->f_pos
= ceph_make_fpos(frag
, off
);
393 dout("readdir next frag is %x\n", frag
);
399 * if dir_release_count still matches the dir, no dentries
400 * were released during the whole readdir, and we should have
401 * the complete dir contents in our cache.
403 spin_lock(&inode
->i_lock
);
404 if (ci
->i_release_count
== fi
->dir_release_count
) {
405 dout(" marking %p complete\n", inode
);
406 ci
->i_ceph_flags
|= CEPH_I_COMPLETE
;
407 ci
->i_max_offset
= filp
->f_pos
;
409 spin_unlock(&inode
->i_lock
);
411 dout("readdir %p filp %p done.\n", inode
, filp
);
415 static void reset_readdir(struct ceph_file_info
*fi
)
417 if (fi
->last_readdir
) {
418 ceph_mdsc_put_request(fi
->last_readdir
);
419 fi
->last_readdir
= NULL
;
421 kfree(fi
->last_name
);
422 fi
->next_offset
= 2; /* compensate for . and .. */
430 static loff_t
ceph_dir_llseek(struct file
*file
, loff_t offset
, int origin
)
432 struct ceph_file_info
*fi
= file
->private_data
;
433 struct inode
*inode
= file
->f_mapping
->host
;
434 loff_t old_offset
= offset
;
437 mutex_lock(&inode
->i_mutex
);
440 offset
+= inode
->i_size
+ 2; /* FIXME */
443 offset
+= file
->f_pos
;
446 if (offset
>= 0 && offset
<= inode
->i_sb
->s_maxbytes
) {
447 if (offset
!= file
->f_pos
) {
448 file
->f_pos
= offset
;
455 * discard buffered readdir content on seekdir(0), or
456 * seek to new frag, or seek prior to current chunk.
459 fpos_frag(offset
) != fpos_frag(old_offset
) ||
460 fpos_off(offset
) < fi
->offset
) {
461 dout("dir_llseek dropping %p content\n", file
);
465 /* bump dir_release_count if we did a forward seek */
466 if (offset
> old_offset
)
467 fi
->dir_release_count
--;
469 mutex_unlock(&inode
->i_mutex
);
474 * Process result of a lookup/open request.
476 * Mainly, make sure we return the final req->r_dentry (if it already
477 * existed) in place of the original VFS-provided dentry when they
480 * Gracefully handle the case where the MDS replies with -ENOENT and
481 * no trace (which it may do, at its discretion, e.g., if it doesn't
482 * care to issue a lease on the negative dentry).
484 struct dentry
*ceph_finish_lookup(struct ceph_mds_request
*req
,
485 struct dentry
*dentry
, int err
)
487 struct ceph_client
*client
= ceph_sb_to_client(dentry
->d_sb
);
488 struct inode
*parent
= dentry
->d_parent
->d_inode
;
491 if (err
== -ENOENT
&&
492 ceph_vino(parent
).ino
!= CEPH_INO_ROOT
&& /* no .snap in root dir */
493 strcmp(dentry
->d_name
.name
,
494 client
->mount_args
->snapdir_name
) == 0) {
495 struct inode
*inode
= ceph_get_snapdir(parent
);
496 dout("ENOENT on snapdir %p '%.*s', linking to snapdir %p\n",
497 dentry
, dentry
->d_name
.len
, dentry
->d_name
.name
, inode
);
498 BUG_ON(!d_unhashed(dentry
));
499 d_add(dentry
, inode
);
503 if (err
== -ENOENT
) {
506 if (!req
->r_reply_info
.head
->is_dentry
) {
507 dout("ENOENT and no trace, dentry %p inode %p\n",
508 dentry
, dentry
->d_inode
);
509 if (dentry
->d_inode
) {
518 dentry
= ERR_PTR(err
);
519 else if (dentry
!= req
->r_dentry
)
520 dentry
= dget(req
->r_dentry
); /* we got spliced */
526 static int is_root_ceph_dentry(struct inode
*inode
, struct dentry
*dentry
)
528 return ceph_ino(inode
) == CEPH_INO_ROOT
&&
529 strncmp(dentry
->d_name
.name
, ".ceph", 5) == 0;
533 * Look up a single dir entry. If there is a lookup intent, inform
534 * the MDS so that it gets our 'caps wanted' value in a single op.
536 static struct dentry
*ceph_lookup(struct inode
*dir
, struct dentry
*dentry
,
537 struct nameidata
*nd
)
539 struct ceph_client
*client
= ceph_sb_to_client(dir
->i_sb
);
540 struct ceph_mds_client
*mdsc
= &client
->mdsc
;
541 struct ceph_mds_request
*req
;
545 dout("lookup %p dentry %p '%.*s'\n",
546 dir
, dentry
, dentry
->d_name
.len
, dentry
->d_name
.name
);
548 if (dentry
->d_name
.len
> NAME_MAX
)
549 return ERR_PTR(-ENAMETOOLONG
);
551 err
= ceph_init_dentry(dentry
);
555 /* open (but not create!) intent? */
557 (nd
->flags
& LOOKUP_OPEN
) &&
558 (nd
->flags
& LOOKUP_CONTINUE
) == 0 && /* only open last component */
559 !(nd
->intent
.open
.flags
& O_CREAT
)) {
560 int mode
= nd
->intent
.open
.create_mode
& ~current
->fs
->umask
;
561 return ceph_lookup_open(dir
, dentry
, nd
, mode
, 1);
564 /* can we conclude ENOENT locally? */
565 if (dentry
->d_inode
== NULL
) {
566 struct ceph_inode_info
*ci
= ceph_inode(dir
);
567 struct ceph_dentry_info
*di
= ceph_dentry(dentry
);
569 spin_lock(&dir
->i_lock
);
570 dout(" dir %p flags are %d\n", dir
, ci
->i_ceph_flags
);
571 if (strncmp(dentry
->d_name
.name
,
572 client
->mount_args
->snapdir_name
,
573 dentry
->d_name
.len
) &&
574 !is_root_ceph_dentry(dir
, dentry
) &&
575 (ci
->i_ceph_flags
& CEPH_I_COMPLETE
) &&
576 (__ceph_caps_issued_mask(ci
, CEPH_CAP_FILE_SHARED
, 1))) {
577 spin_unlock(&dir
->i_lock
);
578 dout(" dir %p complete, -ENOENT\n", dir
);
580 di
->lease_shared_gen
= ci
->i_shared_gen
;
583 spin_unlock(&dir
->i_lock
);
586 op
= ceph_snap(dir
) == CEPH_SNAPDIR
?
587 CEPH_MDS_OP_LOOKUPSNAP
: CEPH_MDS_OP_LOOKUP
;
588 req
= ceph_mdsc_create_request(mdsc
, op
, USE_ANY_MDS
);
590 return ERR_PTR(PTR_ERR(req
));
591 req
->r_dentry
= dget(dentry
);
593 /* we only need inode linkage */
594 req
->r_args
.getattr
.mask
= cpu_to_le32(CEPH_STAT_CAP_INODE
);
595 req
->r_locked_dir
= dir
;
596 err
= ceph_mdsc_do_request(mdsc
, NULL
, req
);
597 dentry
= ceph_finish_lookup(req
, dentry
, err
);
598 ceph_mdsc_put_request(req
); /* will dput(dentry) */
599 dout("lookup result=%p\n", dentry
);
604 * If we do a create but get no trace back from the MDS, follow up with
605 * a lookup (the VFS expects us to link up the provided dentry).
607 int ceph_handle_notrace_create(struct inode
*dir
, struct dentry
*dentry
)
609 struct dentry
*result
= ceph_lookup(dir
, dentry
, NULL
);
611 if (result
&& !IS_ERR(result
)) {
613 * We created the item, then did a lookup, and found
614 * it was already linked to another inode we already
615 * had in our cache (and thus got spliced). Link our
616 * dentry to that inode, but don't hash it, just in
617 * case the VFS wants to dereference it.
619 BUG_ON(!result
->d_inode
);
620 d_instantiate(dentry
, result
->d_inode
);
623 return PTR_ERR(result
);
626 static int ceph_mknod(struct inode
*dir
, struct dentry
*dentry
,
627 int mode
, dev_t rdev
)
629 struct ceph_client
*client
= ceph_sb_to_client(dir
->i_sb
);
630 struct ceph_mds_client
*mdsc
= &client
->mdsc
;
631 struct ceph_mds_request
*req
;
634 if (ceph_snap(dir
) != CEPH_NOSNAP
)
637 dout("mknod in dir %p dentry %p mode 0%o rdev %d\n",
638 dir
, dentry
, mode
, rdev
);
639 req
= ceph_mdsc_create_request(mdsc
, CEPH_MDS_OP_MKNOD
, USE_AUTH_MDS
);
644 req
->r_dentry
= dget(dentry
);
646 req
->r_locked_dir
= dir
;
647 req
->r_args
.mknod
.mode
= cpu_to_le32(mode
);
648 req
->r_args
.mknod
.rdev
= cpu_to_le32(rdev
);
649 req
->r_dentry_drop
= CEPH_CAP_FILE_SHARED
;
650 req
->r_dentry_unless
= CEPH_CAP_FILE_EXCL
;
651 err
= ceph_mdsc_do_request(mdsc
, dir
, req
);
652 if (!err
&& !req
->r_reply_info
.head
->is_dentry
)
653 err
= ceph_handle_notrace_create(dir
, dentry
);
654 ceph_mdsc_put_request(req
);
660 static int ceph_create(struct inode
*dir
, struct dentry
*dentry
, int mode
,
661 struct nameidata
*nd
)
663 dout("create in dir %p dentry %p name '%.*s'\n",
664 dir
, dentry
, dentry
->d_name
.len
, dentry
->d_name
.name
);
666 if (ceph_snap(dir
) != CEPH_NOSNAP
)
670 BUG_ON((nd
->flags
& LOOKUP_OPEN
) == 0);
671 dentry
= ceph_lookup_open(dir
, dentry
, nd
, mode
, 0);
672 /* hrm, what should i do here if we get aliased? */
674 return PTR_ERR(dentry
);
678 /* fall back to mknod */
679 return ceph_mknod(dir
, dentry
, (mode
& ~S_IFMT
) | S_IFREG
, 0);
682 static int ceph_symlink(struct inode
*dir
, struct dentry
*dentry
,
685 struct ceph_client
*client
= ceph_sb_to_client(dir
->i_sb
);
686 struct ceph_mds_client
*mdsc
= &client
->mdsc
;
687 struct ceph_mds_request
*req
;
690 if (ceph_snap(dir
) != CEPH_NOSNAP
)
693 dout("symlink in dir %p dentry %p to '%s'\n", dir
, dentry
, dest
);
694 req
= ceph_mdsc_create_request(mdsc
, CEPH_MDS_OP_SYMLINK
, USE_AUTH_MDS
);
699 req
->r_dentry
= dget(dentry
);
701 req
->r_path2
= kstrdup(dest
, GFP_NOFS
);
702 req
->r_locked_dir
= dir
;
703 req
->r_dentry_drop
= CEPH_CAP_FILE_SHARED
;
704 req
->r_dentry_unless
= CEPH_CAP_FILE_EXCL
;
705 err
= ceph_mdsc_do_request(mdsc
, dir
, req
);
706 if (!err
&& !req
->r_reply_info
.head
->is_dentry
)
707 err
= ceph_handle_notrace_create(dir
, dentry
);
708 ceph_mdsc_put_request(req
);
714 static int ceph_mkdir(struct inode
*dir
, struct dentry
*dentry
, int mode
)
716 struct ceph_client
*client
= ceph_sb_to_client(dir
->i_sb
);
717 struct ceph_mds_client
*mdsc
= &client
->mdsc
;
718 struct ceph_mds_request
*req
;
722 if (ceph_snap(dir
) == CEPH_SNAPDIR
) {
723 /* mkdir .snap/foo is a MKSNAP */
724 op
= CEPH_MDS_OP_MKSNAP
;
725 dout("mksnap dir %p snap '%.*s' dn %p\n", dir
,
726 dentry
->d_name
.len
, dentry
->d_name
.name
, dentry
);
727 } else if (ceph_snap(dir
) == CEPH_NOSNAP
) {
728 dout("mkdir dir %p dn %p mode 0%o\n", dir
, dentry
, mode
);
729 op
= CEPH_MDS_OP_MKDIR
;
733 req
= ceph_mdsc_create_request(mdsc
, op
, USE_AUTH_MDS
);
739 req
->r_dentry
= dget(dentry
);
741 req
->r_locked_dir
= dir
;
742 req
->r_args
.mkdir
.mode
= cpu_to_le32(mode
);
743 req
->r_dentry_drop
= CEPH_CAP_FILE_SHARED
;
744 req
->r_dentry_unless
= CEPH_CAP_FILE_EXCL
;
745 err
= ceph_mdsc_do_request(mdsc
, dir
, req
);
746 if (!err
&& !req
->r_reply_info
.head
->is_dentry
)
747 err
= ceph_handle_notrace_create(dir
, dentry
);
748 ceph_mdsc_put_request(req
);
755 static int ceph_link(struct dentry
*old_dentry
, struct inode
*dir
,
756 struct dentry
*dentry
)
758 struct ceph_client
*client
= ceph_sb_to_client(dir
->i_sb
);
759 struct ceph_mds_client
*mdsc
= &client
->mdsc
;
760 struct ceph_mds_request
*req
;
763 if (ceph_snap(dir
) != CEPH_NOSNAP
)
766 dout("link in dir %p old_dentry %p dentry %p\n", dir
,
768 req
= ceph_mdsc_create_request(mdsc
, CEPH_MDS_OP_LINK
, USE_AUTH_MDS
);
773 req
->r_dentry
= dget(dentry
);
775 req
->r_old_dentry
= dget(old_dentry
); /* or inode? hrm. */
776 req
->r_locked_dir
= dir
;
777 req
->r_dentry_drop
= CEPH_CAP_FILE_SHARED
;
778 req
->r_dentry_unless
= CEPH_CAP_FILE_EXCL
;
779 err
= ceph_mdsc_do_request(mdsc
, dir
, req
);
782 else if (!req
->r_reply_info
.head
->is_dentry
)
783 d_instantiate(dentry
, igrab(old_dentry
->d_inode
));
784 ceph_mdsc_put_request(req
);
789 * For a soon-to-be unlinked file, drop the AUTH_RDCACHE caps. If it
790 * looks like the link count will hit 0, drop any other caps (other
791 * than PIN) we don't specifically want (due to the file still being
794 static int drop_caps_for_unlink(struct inode
*inode
)
796 struct ceph_inode_info
*ci
= ceph_inode(inode
);
797 int drop
= CEPH_CAP_LINK_SHARED
| CEPH_CAP_LINK_EXCL
;
799 spin_lock(&inode
->i_lock
);
800 if (inode
->i_nlink
== 1) {
801 drop
|= ~(__ceph_caps_wanted(ci
) | CEPH_CAP_PIN
);
802 ci
->i_ceph_flags
|= CEPH_I_NODELAY
;
804 spin_unlock(&inode
->i_lock
);
809 * rmdir and unlink are differ only by the metadata op code
811 static int ceph_unlink(struct inode
*dir
, struct dentry
*dentry
)
813 struct ceph_client
*client
= ceph_sb_to_client(dir
->i_sb
);
814 struct ceph_mds_client
*mdsc
= &client
->mdsc
;
815 struct inode
*inode
= dentry
->d_inode
;
816 struct ceph_mds_request
*req
;
820 if (ceph_snap(dir
) == CEPH_SNAPDIR
) {
821 /* rmdir .snap/foo is RMSNAP */
822 dout("rmsnap dir %p '%.*s' dn %p\n", dir
, dentry
->d_name
.len
,
823 dentry
->d_name
.name
, dentry
);
824 op
= CEPH_MDS_OP_RMSNAP
;
825 } else if (ceph_snap(dir
) == CEPH_NOSNAP
) {
826 dout("unlink/rmdir dir %p dn %p inode %p\n",
828 op
= ((dentry
->d_inode
->i_mode
& S_IFMT
) == S_IFDIR
) ?
829 CEPH_MDS_OP_RMDIR
: CEPH_MDS_OP_UNLINK
;
832 req
= ceph_mdsc_create_request(mdsc
, op
, USE_AUTH_MDS
);
837 req
->r_dentry
= dget(dentry
);
839 req
->r_locked_dir
= dir
;
840 req
->r_dentry_drop
= CEPH_CAP_FILE_SHARED
;
841 req
->r_dentry_unless
= CEPH_CAP_FILE_EXCL
;
842 req
->r_inode_drop
= drop_caps_for_unlink(inode
);
843 err
= ceph_mdsc_do_request(mdsc
, dir
, req
);
844 if (!err
&& !req
->r_reply_info
.head
->is_dentry
)
846 ceph_mdsc_put_request(req
);
851 static int ceph_rename(struct inode
*old_dir
, struct dentry
*old_dentry
,
852 struct inode
*new_dir
, struct dentry
*new_dentry
)
854 struct ceph_client
*client
= ceph_sb_to_client(old_dir
->i_sb
);
855 struct ceph_mds_client
*mdsc
= &client
->mdsc
;
856 struct ceph_mds_request
*req
;
859 if (ceph_snap(old_dir
) != ceph_snap(new_dir
))
861 if (ceph_snap(old_dir
) != CEPH_NOSNAP
||
862 ceph_snap(new_dir
) != CEPH_NOSNAP
)
864 dout("rename dir %p dentry %p to dir %p dentry %p\n",
865 old_dir
, old_dentry
, new_dir
, new_dentry
);
866 req
= ceph_mdsc_create_request(mdsc
, CEPH_MDS_OP_RENAME
, USE_AUTH_MDS
);
869 req
->r_dentry
= dget(new_dentry
);
871 req
->r_old_dentry
= dget(old_dentry
);
872 req
->r_locked_dir
= new_dir
;
873 req
->r_old_dentry_drop
= CEPH_CAP_FILE_SHARED
;
874 req
->r_old_dentry_unless
= CEPH_CAP_FILE_EXCL
;
875 req
->r_dentry_drop
= CEPH_CAP_FILE_SHARED
;
876 req
->r_dentry_unless
= CEPH_CAP_FILE_EXCL
;
877 /* release LINK_RDCACHE on source inode (mds will lock it) */
878 req
->r_old_inode_drop
= CEPH_CAP_LINK_SHARED
;
879 if (new_dentry
->d_inode
)
880 req
->r_inode_drop
= drop_caps_for_unlink(new_dentry
->d_inode
);
881 err
= ceph_mdsc_do_request(mdsc
, old_dir
, req
);
882 if (!err
&& !req
->r_reply_info
.head
->is_dentry
) {
884 * Normally d_move() is done by fill_trace (called by
885 * do_request, above). If there is no trace, we need
889 /* d_move screws up d_subdirs order */
890 ceph_i_clear(new_dir
, CEPH_I_COMPLETE
);
892 d_move(old_dentry
, new_dentry
);
894 /* ensure target dentry is invalidated, despite
895 rehashing bug in vfs_rename_dir */
896 ceph_invalidate_dentry_lease(new_dentry
);
898 ceph_mdsc_put_request(req
);
903 * Ensure a dentry lease will no longer revalidate.
905 void ceph_invalidate_dentry_lease(struct dentry
*dentry
)
907 spin_lock(&dentry
->d_lock
);
908 dentry
->d_time
= jiffies
;
909 ceph_dentry(dentry
)->lease_shared_gen
= 0;
910 spin_unlock(&dentry
->d_lock
);
914 * Check if dentry lease is valid. If not, delete the lease. Try to
915 * renew if the least is more than half up.
917 static int dentry_lease_is_valid(struct dentry
*dentry
)
919 struct ceph_dentry_info
*di
;
920 struct ceph_mds_session
*s
;
924 struct ceph_mds_session
*session
= NULL
;
925 struct inode
*dir
= NULL
;
928 spin_lock(&dentry
->d_lock
);
929 di
= ceph_dentry(dentry
);
930 if (di
&& di
->lease_session
) {
931 s
= di
->lease_session
;
932 spin_lock(&s
->s_cap_lock
);
935 spin_unlock(&s
->s_cap_lock
);
937 if (di
->lease_gen
== gen
&&
938 time_before(jiffies
, dentry
->d_time
) &&
939 time_before(jiffies
, ttl
)) {
941 if (di
->lease_renew_after
&&
942 time_after(jiffies
, di
->lease_renew_after
)) {
943 /* we should renew */
944 dir
= dentry
->d_parent
->d_inode
;
945 session
= ceph_get_mds_session(s
);
947 di
->lease_renew_after
= 0;
948 di
->lease_renew_from
= jiffies
;
952 spin_unlock(&dentry
->d_lock
);
955 ceph_mdsc_lease_send_msg(session
, dir
, dentry
,
956 CEPH_MDS_LEASE_RENEW
, seq
);
957 ceph_put_mds_session(session
);
959 dout("dentry_lease_is_valid - dentry %p = %d\n", dentry
, valid
);
964 * Check if directory-wide content lease/cap is valid.
966 static int dir_lease_is_valid(struct inode
*dir
, struct dentry
*dentry
)
968 struct ceph_inode_info
*ci
= ceph_inode(dir
);
969 struct ceph_dentry_info
*di
= ceph_dentry(dentry
);
972 spin_lock(&dir
->i_lock
);
973 if (ci
->i_shared_gen
== di
->lease_shared_gen
)
974 valid
= __ceph_caps_issued_mask(ci
, CEPH_CAP_FILE_SHARED
, 1);
975 spin_unlock(&dir
->i_lock
);
976 dout("dir_lease_is_valid dir %p v%u dentry %p v%u = %d\n",
977 dir
, (unsigned)ci
->i_shared_gen
, dentry
,
978 (unsigned)di
->lease_shared_gen
, valid
);
983 * Check if cached dentry can be trusted.
985 static int ceph_d_revalidate(struct dentry
*dentry
, struct nameidata
*nd
)
987 struct inode
*dir
= dentry
->d_parent
->d_inode
;
989 dout("d_revalidate %p '%.*s' inode %p offset %lld\n", dentry
,
990 dentry
->d_name
.len
, dentry
->d_name
.name
, dentry
->d_inode
,
991 ceph_dentry(dentry
)->offset
);
993 /* always trust cached snapped dentries, snapdir dentry */
994 if (ceph_snap(dir
) != CEPH_NOSNAP
) {
995 dout("d_revalidate %p '%.*s' inode %p is SNAPPED\n", dentry
,
996 dentry
->d_name
.len
, dentry
->d_name
.name
, dentry
->d_inode
);
999 if (dentry
->d_inode
&& ceph_snap(dentry
->d_inode
) == CEPH_SNAPDIR
)
1002 if (dentry_lease_is_valid(dentry
) ||
1003 dir_lease_is_valid(dir
, dentry
))
1006 dout("d_revalidate %p invalid\n", dentry
);
1010 ceph_dentry_lru_touch(dentry
);
1015 * When a dentry is released, clear the dir I_COMPLETE if it was part
1016 * of the current dir gen.
1018 static void ceph_dentry_release(struct dentry
*dentry
)
1020 struct ceph_dentry_info
*di
= ceph_dentry(dentry
);
1021 struct inode
*parent_inode
= dentry
->d_parent
->d_inode
;
1024 struct ceph_inode_info
*ci
= ceph_inode(parent_inode
);
1026 spin_lock(&parent_inode
->i_lock
);
1027 if (ci
->i_shared_gen
== di
->lease_shared_gen
) {
1028 dout(" clearing %p complete (d_release)\n",
1030 ci
->i_ceph_flags
&= ~CEPH_I_COMPLETE
;
1031 ci
->i_release_count
++;
1033 spin_unlock(&parent_inode
->i_lock
);
1036 ceph_dentry_lru_del(dentry
);
1037 if (di
->lease_session
)
1038 ceph_put_mds_session(di
->lease_session
);
1039 kmem_cache_free(ceph_dentry_cachep
, di
);
1040 dentry
->d_fsdata
= NULL
;
1044 static int ceph_snapdir_d_revalidate(struct dentry
*dentry
,
1045 struct nameidata
*nd
)
1048 * Eventually, we'll want to revalidate snapped metadata
1049 * too... probably...
1057 * read() on a dir. This weird interface hack only works if mounted
1058 * with '-o dirstat'.
1060 static ssize_t
ceph_read_dir(struct file
*file
, char __user
*buf
, size_t size
,
1063 struct ceph_file_info
*cf
= file
->private_data
;
1064 struct inode
*inode
= file
->f_dentry
->d_inode
;
1065 struct ceph_inode_info
*ci
= ceph_inode(inode
);
1068 if (!ceph_test_opt(ceph_sb_to_client(inode
->i_sb
), DIRSTAT
))
1071 if (!cf
->dir_info
) {
1072 cf
->dir_info
= kmalloc(1024, GFP_NOFS
);
1076 sprintf(cf
->dir_info
,
1079 " subdirs: %20lld\n"
1080 "rentries: %20lld\n"
1082 " rsubdirs: %20lld\n"
1084 "rctime: %10ld.%09ld\n",
1085 ci
->i_files
+ ci
->i_subdirs
,
1088 ci
->i_rfiles
+ ci
->i_rsubdirs
,
1092 (long)ci
->i_rctime
.tv_sec
,
1093 (long)ci
->i_rctime
.tv_nsec
);
1096 if (*ppos
>= cf
->dir_info_len
)
1098 size
= min_t(unsigned, size
, cf
->dir_info_len
-*ppos
);
1099 left
= copy_to_user(buf
, cf
->dir_info
+ *ppos
, size
);
1102 *ppos
+= (size
- left
);
1107 * an fsync() on a dir will wait for any uncommitted directory
1108 * operations to commit.
1110 static int ceph_dir_fsync(struct file
*file
, struct dentry
*dentry
,
1113 struct inode
*inode
= dentry
->d_inode
;
1114 struct ceph_inode_info
*ci
= ceph_inode(inode
);
1115 struct list_head
*head
= &ci
->i_unsafe_dirops
;
1116 struct ceph_mds_request
*req
;
1120 dout("dir_fsync %p\n", inode
);
1121 spin_lock(&ci
->i_unsafe_lock
);
1122 if (list_empty(head
))
1125 req
= list_entry(head
->prev
,
1126 struct ceph_mds_request
, r_unsafe_dir_item
);
1127 last_tid
= req
->r_tid
;
1130 ceph_mdsc_get_request(req
);
1131 spin_unlock(&ci
->i_unsafe_lock
);
1132 dout("dir_fsync %p wait on tid %llu (until %llu)\n",
1133 inode
, req
->r_tid
, last_tid
);
1134 if (req
->r_timeout
) {
1135 ret
= wait_for_completion_timeout(
1136 &req
->r_safe_completion
, req
->r_timeout
);
1140 ret
= -EIO
; /* timed out */
1142 wait_for_completion(&req
->r_safe_completion
);
1144 spin_lock(&ci
->i_unsafe_lock
);
1145 ceph_mdsc_put_request(req
);
1147 if (ret
|| list_empty(head
))
1149 req
= list_entry(head
->next
,
1150 struct ceph_mds_request
, r_unsafe_dir_item
);
1151 } while (req
->r_tid
< last_tid
);
1153 spin_unlock(&ci
->i_unsafe_lock
);
1158 * We maintain a private dentry LRU.
1160 * FIXME: this needs to be changed to a per-mds lru to be useful.
1162 void ceph_dentry_lru_add(struct dentry
*dn
)
1164 struct ceph_dentry_info
*di
= ceph_dentry(dn
);
1165 struct ceph_mds_client
*mdsc
;
1167 dout("dentry_lru_add %p %p '%.*s'\n", di
, dn
,
1168 dn
->d_name
.len
, dn
->d_name
.name
);
1170 mdsc
= &ceph_sb_to_client(dn
->d_sb
)->mdsc
;
1171 spin_lock(&mdsc
->dentry_lru_lock
);
1172 list_add_tail(&di
->lru
, &mdsc
->dentry_lru
);
1174 spin_unlock(&mdsc
->dentry_lru_lock
);
1178 void ceph_dentry_lru_touch(struct dentry
*dn
)
1180 struct ceph_dentry_info
*di
= ceph_dentry(dn
);
1181 struct ceph_mds_client
*mdsc
;
1183 dout("dentry_lru_touch %p %p '%.*s' (offset %lld)\n", di
, dn
,
1184 dn
->d_name
.len
, dn
->d_name
.name
, di
->offset
);
1186 mdsc
= &ceph_sb_to_client(dn
->d_sb
)->mdsc
;
1187 spin_lock(&mdsc
->dentry_lru_lock
);
1188 list_move_tail(&di
->lru
, &mdsc
->dentry_lru
);
1189 spin_unlock(&mdsc
->dentry_lru_lock
);
1193 void ceph_dentry_lru_del(struct dentry
*dn
)
1195 struct ceph_dentry_info
*di
= ceph_dentry(dn
);
1196 struct ceph_mds_client
*mdsc
;
1198 dout("dentry_lru_del %p %p '%.*s'\n", di
, dn
,
1199 dn
->d_name
.len
, dn
->d_name
.name
);
1201 mdsc
= &ceph_sb_to_client(dn
->d_sb
)->mdsc
;
1202 spin_lock(&mdsc
->dentry_lru_lock
);
1203 list_del_init(&di
->lru
);
1205 spin_unlock(&mdsc
->dentry_lru_lock
);
1209 const struct file_operations ceph_dir_fops
= {
1210 .read
= ceph_read_dir
,
1211 .readdir
= ceph_readdir
,
1212 .llseek
= ceph_dir_llseek
,
1214 .release
= ceph_release
,
1215 .unlocked_ioctl
= ceph_ioctl
,
1216 .fsync
= ceph_dir_fsync
,
1219 const struct inode_operations ceph_dir_iops
= {
1220 .lookup
= ceph_lookup
,
1221 .permission
= ceph_permission
,
1222 .getattr
= ceph_getattr
,
1223 .setattr
= ceph_setattr
,
1224 .setxattr
= ceph_setxattr
,
1225 .getxattr
= ceph_getxattr
,
1226 .listxattr
= ceph_listxattr
,
1227 .removexattr
= ceph_removexattr
,
1228 .mknod
= ceph_mknod
,
1229 .symlink
= ceph_symlink
,
1230 .mkdir
= ceph_mkdir
,
1232 .unlink
= ceph_unlink
,
1233 .rmdir
= ceph_unlink
,
1234 .rename
= ceph_rename
,
1235 .create
= ceph_create
,
1238 struct dentry_operations ceph_dentry_ops
= {
1239 .d_revalidate
= ceph_d_revalidate
,
1240 .d_release
= ceph_dentry_release
,
1243 struct dentry_operations ceph_snapdir_dentry_ops
= {
1244 .d_revalidate
= ceph_snapdir_d_revalidate
,
1247 struct dentry_operations ceph_snap_dentry_ops
= {