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 ceph_snap(inode
) != CEPH_SNAPDIR
&&
270 (ci
->i_ceph_flags
& CEPH_I_COMPLETE
) &&
271 __ceph_caps_issued_mask(ci
, CEPH_CAP_FILE_SHARED
, 1)) {
272 err
= __dcache_readdir(filp
, dirent
, filldir
);
273 if (err
!= -EAGAIN
) {
274 spin_unlock(&inode
->i_lock
);
278 spin_unlock(&inode
->i_lock
);
280 err
= note_last_dentry(fi
, fi
->dentry
->d_name
.name
,
281 fi
->dentry
->d_name
.len
);
288 /* proceed with a normal readdir */
291 /* do we have the correct frag content buffered? */
292 if (fi
->frag
!= frag
|| fi
->last_readdir
== NULL
) {
293 struct ceph_mds_request
*req
;
294 int op
= ceph_snap(inode
) == CEPH_SNAPDIR
?
295 CEPH_MDS_OP_LSSNAP
: CEPH_MDS_OP_READDIR
;
297 /* discard old result, if any */
298 if (fi
->last_readdir
) {
299 ceph_mdsc_put_request(fi
->last_readdir
);
300 fi
->last_readdir
= NULL
;
303 /* requery frag tree, as the frag topology may have changed */
304 frag
= ceph_choose_frag(ceph_inode(inode
), frag
, NULL
, NULL
);
306 dout("readdir fetching %llx.%llx frag %x offset '%s'\n",
307 ceph_vinop(inode
), frag
, fi
->last_name
);
308 req
= ceph_mdsc_create_request(mdsc
, op
, USE_AUTH_MDS
);
311 req
->r_inode
= igrab(inode
);
312 req
->r_dentry
= dget(filp
->f_dentry
);
313 /* hints to request -> mds selection code */
314 req
->r_direct_mode
= USE_AUTH_MDS
;
315 req
->r_direct_hash
= ceph_frag_value(frag
);
316 req
->r_direct_is_hash
= true;
317 req
->r_path2
= kstrdup(fi
->last_name
, GFP_NOFS
);
318 req
->r_readdir_offset
= fi
->next_offset
;
319 req
->r_args
.readdir
.frag
= cpu_to_le32(frag
);
320 req
->r_args
.readdir
.max_entries
= cpu_to_le32(max_entries
);
321 req
->r_args
.readdir
.max_bytes
= cpu_to_le32(max_bytes
);
322 req
->r_num_caps
= max_entries
+ 1;
323 err
= ceph_mdsc_do_request(mdsc
, NULL
, req
);
325 ceph_mdsc_put_request(req
);
328 dout("readdir got and parsed readdir result=%d"
329 " on frag %x, end=%d, complete=%d\n", err
, frag
,
330 (int)req
->r_reply_info
.dir_end
,
331 (int)req
->r_reply_info
.dir_complete
);
333 if (!req
->r_did_prepopulate
) {
334 dout("readdir !did_prepopulate");
335 fi
->dir_release_count
--; /* preclude I_COMPLETE */
338 /* note next offset and last dentry name */
339 fi
->offset
= fi
->next_offset
;
340 fi
->last_readdir
= req
;
342 if (req
->r_reply_info
.dir_end
) {
343 kfree(fi
->last_name
);
344 fi
->last_name
= NULL
;
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 dout("readdir off %d (%d/%d) -> %lld '%.*s' %p\n",
365 off
, off
- fi
->offset
, rinfo
->dir_nr
, pos
,
366 rinfo
->dir_dname_len
[off
- fi
->offset
],
367 rinfo
->dir_dname
[off
- fi
->offset
], in
);
369 ftype
= le32_to_cpu(in
->mode
) >> 12;
371 rinfo
->dir_dname
[off
- fi
->offset
],
372 rinfo
->dir_dname_len
[off
- fi
->offset
],
374 le64_to_cpu(in
->ino
),
376 dout("filldir stopping us...\n");
380 filp
->f_pos
= pos
+ 1;
384 ceph_mdsc_put_request(fi
->last_readdir
);
385 fi
->last_readdir
= NULL
;
390 if (!ceph_frag_is_rightmost(frag
)) {
391 frag
= ceph_frag_next(frag
);
393 filp
->f_pos
= ceph_make_fpos(frag
, off
);
394 dout("readdir next frag is %x\n", frag
);
400 * if dir_release_count still matches the dir, no dentries
401 * were released during the whole readdir, and we should have
402 * the complete dir contents in our cache.
404 spin_lock(&inode
->i_lock
);
405 if (ci
->i_release_count
== fi
->dir_release_count
) {
406 dout(" marking %p complete\n", inode
);
407 ci
->i_ceph_flags
|= CEPH_I_COMPLETE
;
408 ci
->i_max_offset
= filp
->f_pos
;
410 spin_unlock(&inode
->i_lock
);
412 dout("readdir %p filp %p done.\n", inode
, filp
);
416 static void reset_readdir(struct ceph_file_info
*fi
)
418 if (fi
->last_readdir
) {
419 ceph_mdsc_put_request(fi
->last_readdir
);
420 fi
->last_readdir
= NULL
;
422 kfree(fi
->last_name
);
423 fi
->next_offset
= 2; /* compensate for . and .. */
431 static loff_t
ceph_dir_llseek(struct file
*file
, loff_t offset
, int origin
)
433 struct ceph_file_info
*fi
= file
->private_data
;
434 struct inode
*inode
= file
->f_mapping
->host
;
435 loff_t old_offset
= offset
;
438 mutex_lock(&inode
->i_mutex
);
441 offset
+= inode
->i_size
+ 2; /* FIXME */
444 offset
+= file
->f_pos
;
447 if (offset
>= 0 && offset
<= inode
->i_sb
->s_maxbytes
) {
448 if (offset
!= file
->f_pos
) {
449 file
->f_pos
= offset
;
456 * discard buffered readdir content on seekdir(0), or
457 * seek to new frag, or seek prior to current chunk.
460 fpos_frag(offset
) != fpos_frag(old_offset
) ||
461 fpos_off(offset
) < fi
->offset
) {
462 dout("dir_llseek dropping %p content\n", file
);
466 /* bump dir_release_count if we did a forward seek */
467 if (offset
> old_offset
)
468 fi
->dir_release_count
--;
470 mutex_unlock(&inode
->i_mutex
);
475 * Process result of a lookup/open request.
477 * Mainly, make sure we return the final req->r_dentry (if it already
478 * existed) in place of the original VFS-provided dentry when they
481 * Gracefully handle the case where the MDS replies with -ENOENT and
482 * no trace (which it may do, at its discretion, e.g., if it doesn't
483 * care to issue a lease on the negative dentry).
485 struct dentry
*ceph_finish_lookup(struct ceph_mds_request
*req
,
486 struct dentry
*dentry
, int err
)
488 struct ceph_client
*client
= ceph_sb_to_client(dentry
->d_sb
);
489 struct inode
*parent
= dentry
->d_parent
->d_inode
;
492 if (err
== -ENOENT
&&
493 ceph_vino(parent
).ino
!= CEPH_INO_ROOT
&& /* no .snap in root dir */
494 strcmp(dentry
->d_name
.name
,
495 client
->mount_args
->snapdir_name
) == 0) {
496 struct inode
*inode
= ceph_get_snapdir(parent
);
497 dout("ENOENT on snapdir %p '%.*s', linking to snapdir %p\n",
498 dentry
, dentry
->d_name
.len
, dentry
->d_name
.name
, inode
);
499 BUG_ON(!d_unhashed(dentry
));
500 d_add(dentry
, inode
);
504 if (err
== -ENOENT
) {
507 if (!req
->r_reply_info
.head
->is_dentry
) {
508 dout("ENOENT and no trace, dentry %p inode %p\n",
509 dentry
, dentry
->d_inode
);
510 if (dentry
->d_inode
) {
519 dentry
= ERR_PTR(err
);
520 else if (dentry
!= req
->r_dentry
)
521 dentry
= dget(req
->r_dentry
); /* we got spliced */
527 static int is_root_ceph_dentry(struct inode
*inode
, struct dentry
*dentry
)
529 return ceph_ino(inode
) == CEPH_INO_ROOT
&&
530 strncmp(dentry
->d_name
.name
, ".ceph", 5) == 0;
534 * Look up a single dir entry. If there is a lookup intent, inform
535 * the MDS so that it gets our 'caps wanted' value in a single op.
537 static struct dentry
*ceph_lookup(struct inode
*dir
, struct dentry
*dentry
,
538 struct nameidata
*nd
)
540 struct ceph_client
*client
= ceph_sb_to_client(dir
->i_sb
);
541 struct ceph_mds_client
*mdsc
= &client
->mdsc
;
542 struct ceph_mds_request
*req
;
546 dout("lookup %p dentry %p '%.*s'\n",
547 dir
, dentry
, dentry
->d_name
.len
, dentry
->d_name
.name
);
549 if (dentry
->d_name
.len
> NAME_MAX
)
550 return ERR_PTR(-ENAMETOOLONG
);
552 err
= ceph_init_dentry(dentry
);
556 /* open (but not create!) intent? */
558 (nd
->flags
& LOOKUP_OPEN
) &&
559 (nd
->flags
& LOOKUP_CONTINUE
) == 0 && /* only open last component */
560 !(nd
->intent
.open
.flags
& O_CREAT
)) {
561 int mode
= nd
->intent
.open
.create_mode
& ~current
->fs
->umask
;
562 return ceph_lookup_open(dir
, dentry
, nd
, mode
, 1);
565 /* can we conclude ENOENT locally? */
566 if (dentry
->d_inode
== NULL
) {
567 struct ceph_inode_info
*ci
= ceph_inode(dir
);
568 struct ceph_dentry_info
*di
= ceph_dentry(dentry
);
570 spin_lock(&dir
->i_lock
);
571 dout(" dir %p flags are %d\n", dir
, ci
->i_ceph_flags
);
572 if (strncmp(dentry
->d_name
.name
,
573 client
->mount_args
->snapdir_name
,
574 dentry
->d_name
.len
) &&
575 !is_root_ceph_dentry(dir
, dentry
) &&
576 (ci
->i_ceph_flags
& CEPH_I_COMPLETE
) &&
577 (__ceph_caps_issued_mask(ci
, CEPH_CAP_FILE_SHARED
, 1))) {
578 spin_unlock(&dir
->i_lock
);
579 dout(" dir %p complete, -ENOENT\n", dir
);
581 di
->lease_shared_gen
= ci
->i_shared_gen
;
584 spin_unlock(&dir
->i_lock
);
587 op
= ceph_snap(dir
) == CEPH_SNAPDIR
?
588 CEPH_MDS_OP_LOOKUPSNAP
: CEPH_MDS_OP_LOOKUP
;
589 req
= ceph_mdsc_create_request(mdsc
, op
, USE_ANY_MDS
);
591 return ERR_CAST(req
);
592 req
->r_dentry
= dget(dentry
);
594 /* we only need inode linkage */
595 req
->r_args
.getattr
.mask
= cpu_to_le32(CEPH_STAT_CAP_INODE
);
596 req
->r_locked_dir
= dir
;
597 err
= ceph_mdsc_do_request(mdsc
, NULL
, req
);
598 dentry
= ceph_finish_lookup(req
, dentry
, err
);
599 ceph_mdsc_put_request(req
); /* will dput(dentry) */
600 dout("lookup result=%p\n", dentry
);
605 * If we do a create but get no trace back from the MDS, follow up with
606 * a lookup (the VFS expects us to link up the provided dentry).
608 int ceph_handle_notrace_create(struct inode
*dir
, struct dentry
*dentry
)
610 struct dentry
*result
= ceph_lookup(dir
, dentry
, NULL
);
612 if (result
&& !IS_ERR(result
)) {
614 * We created the item, then did a lookup, and found
615 * it was already linked to another inode we already
616 * had in our cache (and thus got spliced). Link our
617 * dentry to that inode, but don't hash it, just in
618 * case the VFS wants to dereference it.
620 BUG_ON(!result
->d_inode
);
621 d_instantiate(dentry
, result
->d_inode
);
624 return PTR_ERR(result
);
627 static int ceph_mknod(struct inode
*dir
, struct dentry
*dentry
,
628 int mode
, dev_t rdev
)
630 struct ceph_client
*client
= ceph_sb_to_client(dir
->i_sb
);
631 struct ceph_mds_client
*mdsc
= &client
->mdsc
;
632 struct ceph_mds_request
*req
;
635 if (ceph_snap(dir
) != CEPH_NOSNAP
)
638 dout("mknod in dir %p dentry %p mode 0%o rdev %d\n",
639 dir
, dentry
, mode
, rdev
);
640 req
= ceph_mdsc_create_request(mdsc
, CEPH_MDS_OP_MKNOD
, USE_AUTH_MDS
);
645 req
->r_dentry
= dget(dentry
);
647 req
->r_locked_dir
= dir
;
648 req
->r_args
.mknod
.mode
= cpu_to_le32(mode
);
649 req
->r_args
.mknod
.rdev
= cpu_to_le32(rdev
);
650 req
->r_dentry_drop
= CEPH_CAP_FILE_SHARED
;
651 req
->r_dentry_unless
= CEPH_CAP_FILE_EXCL
;
652 err
= ceph_mdsc_do_request(mdsc
, dir
, req
);
653 if (!err
&& !req
->r_reply_info
.head
->is_dentry
)
654 err
= ceph_handle_notrace_create(dir
, dentry
);
655 ceph_mdsc_put_request(req
);
661 static int ceph_create(struct inode
*dir
, struct dentry
*dentry
, int mode
,
662 struct nameidata
*nd
)
664 dout("create in dir %p dentry %p name '%.*s'\n",
665 dir
, dentry
, dentry
->d_name
.len
, dentry
->d_name
.name
);
667 if (ceph_snap(dir
) != CEPH_NOSNAP
)
671 BUG_ON((nd
->flags
& LOOKUP_OPEN
) == 0);
672 dentry
= ceph_lookup_open(dir
, dentry
, nd
, mode
, 0);
673 /* hrm, what should i do here if we get aliased? */
675 return PTR_ERR(dentry
);
679 /* fall back to mknod */
680 return ceph_mknod(dir
, dentry
, (mode
& ~S_IFMT
) | S_IFREG
, 0);
683 static int ceph_symlink(struct inode
*dir
, struct dentry
*dentry
,
686 struct ceph_client
*client
= ceph_sb_to_client(dir
->i_sb
);
687 struct ceph_mds_client
*mdsc
= &client
->mdsc
;
688 struct ceph_mds_request
*req
;
691 if (ceph_snap(dir
) != CEPH_NOSNAP
)
694 dout("symlink in dir %p dentry %p to '%s'\n", dir
, dentry
, dest
);
695 req
= ceph_mdsc_create_request(mdsc
, CEPH_MDS_OP_SYMLINK
, USE_AUTH_MDS
);
700 req
->r_dentry
= dget(dentry
);
702 req
->r_path2
= kstrdup(dest
, GFP_NOFS
);
703 req
->r_locked_dir
= dir
;
704 req
->r_dentry_drop
= CEPH_CAP_FILE_SHARED
;
705 req
->r_dentry_unless
= CEPH_CAP_FILE_EXCL
;
706 err
= ceph_mdsc_do_request(mdsc
, dir
, req
);
707 if (!err
&& !req
->r_reply_info
.head
->is_dentry
)
708 err
= ceph_handle_notrace_create(dir
, dentry
);
709 ceph_mdsc_put_request(req
);
715 static int ceph_mkdir(struct inode
*dir
, struct dentry
*dentry
, int mode
)
717 struct ceph_client
*client
= ceph_sb_to_client(dir
->i_sb
);
718 struct ceph_mds_client
*mdsc
= &client
->mdsc
;
719 struct ceph_mds_request
*req
;
723 if (ceph_snap(dir
) == CEPH_SNAPDIR
) {
724 /* mkdir .snap/foo is a MKSNAP */
725 op
= CEPH_MDS_OP_MKSNAP
;
726 dout("mksnap dir %p snap '%.*s' dn %p\n", dir
,
727 dentry
->d_name
.len
, dentry
->d_name
.name
, dentry
);
728 } else if (ceph_snap(dir
) == CEPH_NOSNAP
) {
729 dout("mkdir dir %p dn %p mode 0%o\n", dir
, dentry
, mode
);
730 op
= CEPH_MDS_OP_MKDIR
;
734 req
= ceph_mdsc_create_request(mdsc
, op
, USE_AUTH_MDS
);
740 req
->r_dentry
= dget(dentry
);
742 req
->r_locked_dir
= dir
;
743 req
->r_args
.mkdir
.mode
= cpu_to_le32(mode
);
744 req
->r_dentry_drop
= CEPH_CAP_FILE_SHARED
;
745 req
->r_dentry_unless
= CEPH_CAP_FILE_EXCL
;
746 err
= ceph_mdsc_do_request(mdsc
, dir
, req
);
747 if (!err
&& !req
->r_reply_info
.head
->is_dentry
)
748 err
= ceph_handle_notrace_create(dir
, dentry
);
749 ceph_mdsc_put_request(req
);
756 static int ceph_link(struct dentry
*old_dentry
, struct inode
*dir
,
757 struct dentry
*dentry
)
759 struct ceph_client
*client
= ceph_sb_to_client(dir
->i_sb
);
760 struct ceph_mds_client
*mdsc
= &client
->mdsc
;
761 struct ceph_mds_request
*req
;
764 if (ceph_snap(dir
) != CEPH_NOSNAP
)
767 dout("link in dir %p old_dentry %p dentry %p\n", dir
,
769 req
= ceph_mdsc_create_request(mdsc
, CEPH_MDS_OP_LINK
, USE_AUTH_MDS
);
774 req
->r_dentry
= dget(dentry
);
776 req
->r_old_dentry
= dget(old_dentry
); /* or inode? hrm. */
777 req
->r_locked_dir
= dir
;
778 req
->r_dentry_drop
= CEPH_CAP_FILE_SHARED
;
779 req
->r_dentry_unless
= CEPH_CAP_FILE_EXCL
;
780 err
= ceph_mdsc_do_request(mdsc
, dir
, req
);
783 else if (!req
->r_reply_info
.head
->is_dentry
)
784 d_instantiate(dentry
, igrab(old_dentry
->d_inode
));
785 ceph_mdsc_put_request(req
);
790 * For a soon-to-be unlinked file, drop the AUTH_RDCACHE caps. If it
791 * looks like the link count will hit 0, drop any other caps (other
792 * than PIN) we don't specifically want (due to the file still being
795 static int drop_caps_for_unlink(struct inode
*inode
)
797 struct ceph_inode_info
*ci
= ceph_inode(inode
);
798 int drop
= CEPH_CAP_LINK_SHARED
| CEPH_CAP_LINK_EXCL
;
800 spin_lock(&inode
->i_lock
);
801 if (inode
->i_nlink
== 1) {
802 drop
|= ~(__ceph_caps_wanted(ci
) | CEPH_CAP_PIN
);
803 ci
->i_ceph_flags
|= CEPH_I_NODELAY
;
805 spin_unlock(&inode
->i_lock
);
810 * rmdir and unlink are differ only by the metadata op code
812 static int ceph_unlink(struct inode
*dir
, struct dentry
*dentry
)
814 struct ceph_client
*client
= ceph_sb_to_client(dir
->i_sb
);
815 struct ceph_mds_client
*mdsc
= &client
->mdsc
;
816 struct inode
*inode
= dentry
->d_inode
;
817 struct ceph_mds_request
*req
;
821 if (ceph_snap(dir
) == CEPH_SNAPDIR
) {
822 /* rmdir .snap/foo is RMSNAP */
823 dout("rmsnap dir %p '%.*s' dn %p\n", dir
, dentry
->d_name
.len
,
824 dentry
->d_name
.name
, dentry
);
825 op
= CEPH_MDS_OP_RMSNAP
;
826 } else if (ceph_snap(dir
) == CEPH_NOSNAP
) {
827 dout("unlink/rmdir dir %p dn %p inode %p\n",
829 op
= ((dentry
->d_inode
->i_mode
& S_IFMT
) == S_IFDIR
) ?
830 CEPH_MDS_OP_RMDIR
: CEPH_MDS_OP_UNLINK
;
833 req
= ceph_mdsc_create_request(mdsc
, op
, USE_AUTH_MDS
);
838 req
->r_dentry
= dget(dentry
);
840 req
->r_locked_dir
= dir
;
841 req
->r_dentry_drop
= CEPH_CAP_FILE_SHARED
;
842 req
->r_dentry_unless
= CEPH_CAP_FILE_EXCL
;
843 req
->r_inode_drop
= drop_caps_for_unlink(inode
);
844 err
= ceph_mdsc_do_request(mdsc
, dir
, req
);
845 if (!err
&& !req
->r_reply_info
.head
->is_dentry
)
847 ceph_mdsc_put_request(req
);
852 static int ceph_rename(struct inode
*old_dir
, struct dentry
*old_dentry
,
853 struct inode
*new_dir
, struct dentry
*new_dentry
)
855 struct ceph_client
*client
= ceph_sb_to_client(old_dir
->i_sb
);
856 struct ceph_mds_client
*mdsc
= &client
->mdsc
;
857 struct ceph_mds_request
*req
;
860 if (ceph_snap(old_dir
) != ceph_snap(new_dir
))
862 if (ceph_snap(old_dir
) != CEPH_NOSNAP
||
863 ceph_snap(new_dir
) != CEPH_NOSNAP
)
865 dout("rename dir %p dentry %p to dir %p dentry %p\n",
866 old_dir
, old_dentry
, new_dir
, new_dentry
);
867 req
= ceph_mdsc_create_request(mdsc
, CEPH_MDS_OP_RENAME
, USE_AUTH_MDS
);
870 req
->r_dentry
= dget(new_dentry
);
872 req
->r_old_dentry
= dget(old_dentry
);
873 req
->r_locked_dir
= new_dir
;
874 req
->r_old_dentry_drop
= CEPH_CAP_FILE_SHARED
;
875 req
->r_old_dentry_unless
= CEPH_CAP_FILE_EXCL
;
876 req
->r_dentry_drop
= CEPH_CAP_FILE_SHARED
;
877 req
->r_dentry_unless
= CEPH_CAP_FILE_EXCL
;
878 /* release LINK_RDCACHE on source inode (mds will lock it) */
879 req
->r_old_inode_drop
= CEPH_CAP_LINK_SHARED
;
880 if (new_dentry
->d_inode
)
881 req
->r_inode_drop
= drop_caps_for_unlink(new_dentry
->d_inode
);
882 err
= ceph_mdsc_do_request(mdsc
, old_dir
, req
);
883 if (!err
&& !req
->r_reply_info
.head
->is_dentry
) {
885 * Normally d_move() is done by fill_trace (called by
886 * do_request, above). If there is no trace, we need
890 /* d_move screws up d_subdirs order */
891 ceph_i_clear(new_dir
, CEPH_I_COMPLETE
);
893 d_move(old_dentry
, new_dentry
);
895 /* ensure target dentry is invalidated, despite
896 rehashing bug in vfs_rename_dir */
897 ceph_invalidate_dentry_lease(new_dentry
);
899 ceph_mdsc_put_request(req
);
904 * Ensure a dentry lease will no longer revalidate.
906 void ceph_invalidate_dentry_lease(struct dentry
*dentry
)
908 spin_lock(&dentry
->d_lock
);
909 dentry
->d_time
= jiffies
;
910 ceph_dentry(dentry
)->lease_shared_gen
= 0;
911 spin_unlock(&dentry
->d_lock
);
915 * Check if dentry lease is valid. If not, delete the lease. Try to
916 * renew if the least is more than half up.
918 static int dentry_lease_is_valid(struct dentry
*dentry
)
920 struct ceph_dentry_info
*di
;
921 struct ceph_mds_session
*s
;
925 struct ceph_mds_session
*session
= NULL
;
926 struct inode
*dir
= NULL
;
929 spin_lock(&dentry
->d_lock
);
930 di
= ceph_dentry(dentry
);
931 if (di
&& di
->lease_session
) {
932 s
= di
->lease_session
;
933 spin_lock(&s
->s_cap_lock
);
936 spin_unlock(&s
->s_cap_lock
);
938 if (di
->lease_gen
== gen
&&
939 time_before(jiffies
, dentry
->d_time
) &&
940 time_before(jiffies
, ttl
)) {
942 if (di
->lease_renew_after
&&
943 time_after(jiffies
, di
->lease_renew_after
)) {
944 /* we should renew */
945 dir
= dentry
->d_parent
->d_inode
;
946 session
= ceph_get_mds_session(s
);
948 di
->lease_renew_after
= 0;
949 di
->lease_renew_from
= jiffies
;
953 spin_unlock(&dentry
->d_lock
);
956 ceph_mdsc_lease_send_msg(session
, dir
, dentry
,
957 CEPH_MDS_LEASE_RENEW
, seq
);
958 ceph_put_mds_session(session
);
960 dout("dentry_lease_is_valid - dentry %p = %d\n", dentry
, valid
);
965 * Check if directory-wide content lease/cap is valid.
967 static int dir_lease_is_valid(struct inode
*dir
, struct dentry
*dentry
)
969 struct ceph_inode_info
*ci
= ceph_inode(dir
);
970 struct ceph_dentry_info
*di
= ceph_dentry(dentry
);
973 spin_lock(&dir
->i_lock
);
974 if (ci
->i_shared_gen
== di
->lease_shared_gen
)
975 valid
= __ceph_caps_issued_mask(ci
, CEPH_CAP_FILE_SHARED
, 1);
976 spin_unlock(&dir
->i_lock
);
977 dout("dir_lease_is_valid dir %p v%u dentry %p v%u = %d\n",
978 dir
, (unsigned)ci
->i_shared_gen
, dentry
,
979 (unsigned)di
->lease_shared_gen
, valid
);
984 * Check if cached dentry can be trusted.
986 static int ceph_d_revalidate(struct dentry
*dentry
, struct nameidata
*nd
)
988 struct inode
*dir
= dentry
->d_parent
->d_inode
;
990 dout("d_revalidate %p '%.*s' inode %p offset %lld\n", dentry
,
991 dentry
->d_name
.len
, dentry
->d_name
.name
, dentry
->d_inode
,
992 ceph_dentry(dentry
)->offset
);
994 /* always trust cached snapped dentries, snapdir dentry */
995 if (ceph_snap(dir
) != CEPH_NOSNAP
) {
996 dout("d_revalidate %p '%.*s' inode %p is SNAPPED\n", dentry
,
997 dentry
->d_name
.len
, dentry
->d_name
.name
, dentry
->d_inode
);
1000 if (dentry
->d_inode
&& ceph_snap(dentry
->d_inode
) == CEPH_SNAPDIR
)
1003 if (dentry_lease_is_valid(dentry
) ||
1004 dir_lease_is_valid(dir
, dentry
))
1007 dout("d_revalidate %p invalid\n", dentry
);
1011 ceph_dentry_lru_touch(dentry
);
1016 * When a dentry is released, clear the dir I_COMPLETE if it was part
1017 * of the current dir gen or if this is in the snapshot namespace.
1019 static void ceph_dentry_release(struct dentry
*dentry
)
1021 struct ceph_dentry_info
*di
= ceph_dentry(dentry
);
1022 struct inode
*parent_inode
= dentry
->d_parent
->d_inode
;
1023 u64 snapid
= ceph_snap(parent_inode
);
1025 dout("dentry_release %p parent %p\n", dentry
, parent_inode
);
1027 if (parent_inode
&& snapid
!= CEPH_SNAPDIR
) {
1028 struct ceph_inode_info
*ci
= ceph_inode(parent_inode
);
1030 spin_lock(&parent_inode
->i_lock
);
1031 if (ci
->i_shared_gen
== di
->lease_shared_gen
||
1032 snapid
<= CEPH_MAXSNAP
) {
1033 dout(" clearing %p complete (d_release)\n",
1035 ci
->i_ceph_flags
&= ~CEPH_I_COMPLETE
;
1036 ci
->i_release_count
++;
1038 spin_unlock(&parent_inode
->i_lock
);
1041 ceph_dentry_lru_del(dentry
);
1042 if (di
->lease_session
)
1043 ceph_put_mds_session(di
->lease_session
);
1044 kmem_cache_free(ceph_dentry_cachep
, di
);
1045 dentry
->d_fsdata
= NULL
;
1049 static int ceph_snapdir_d_revalidate(struct dentry
*dentry
,
1050 struct nameidata
*nd
)
1053 * Eventually, we'll want to revalidate snapped metadata
1054 * too... probably...
1062 * read() on a dir. This weird interface hack only works if mounted
1063 * with '-o dirstat'.
1065 static ssize_t
ceph_read_dir(struct file
*file
, char __user
*buf
, size_t size
,
1068 struct ceph_file_info
*cf
= file
->private_data
;
1069 struct inode
*inode
= file
->f_dentry
->d_inode
;
1070 struct ceph_inode_info
*ci
= ceph_inode(inode
);
1073 if (!ceph_test_opt(ceph_sb_to_client(inode
->i_sb
), DIRSTAT
))
1076 if (!cf
->dir_info
) {
1077 cf
->dir_info
= kmalloc(1024, GFP_NOFS
);
1081 sprintf(cf
->dir_info
,
1084 " subdirs: %20lld\n"
1085 "rentries: %20lld\n"
1087 " rsubdirs: %20lld\n"
1089 "rctime: %10ld.%09ld\n",
1090 ci
->i_files
+ ci
->i_subdirs
,
1093 ci
->i_rfiles
+ ci
->i_rsubdirs
,
1097 (long)ci
->i_rctime
.tv_sec
,
1098 (long)ci
->i_rctime
.tv_nsec
);
1101 if (*ppos
>= cf
->dir_info_len
)
1103 size
= min_t(unsigned, size
, cf
->dir_info_len
-*ppos
);
1104 left
= copy_to_user(buf
, cf
->dir_info
+ *ppos
, size
);
1107 *ppos
+= (size
- left
);
1112 * an fsync() on a dir will wait for any uncommitted directory
1113 * operations to commit.
1115 static int ceph_dir_fsync(struct file
*file
, int datasync
)
1117 struct inode
*inode
= file
->f_path
.dentry
->d_inode
;
1118 struct ceph_inode_info
*ci
= ceph_inode(inode
);
1119 struct list_head
*head
= &ci
->i_unsafe_dirops
;
1120 struct ceph_mds_request
*req
;
1124 dout("dir_fsync %p\n", inode
);
1125 spin_lock(&ci
->i_unsafe_lock
);
1126 if (list_empty(head
))
1129 req
= list_entry(head
->prev
,
1130 struct ceph_mds_request
, r_unsafe_dir_item
);
1131 last_tid
= req
->r_tid
;
1134 ceph_mdsc_get_request(req
);
1135 spin_unlock(&ci
->i_unsafe_lock
);
1136 dout("dir_fsync %p wait on tid %llu (until %llu)\n",
1137 inode
, req
->r_tid
, last_tid
);
1138 if (req
->r_timeout
) {
1139 ret
= wait_for_completion_timeout(
1140 &req
->r_safe_completion
, req
->r_timeout
);
1144 ret
= -EIO
; /* timed out */
1146 wait_for_completion(&req
->r_safe_completion
);
1148 spin_lock(&ci
->i_unsafe_lock
);
1149 ceph_mdsc_put_request(req
);
1151 if (ret
|| list_empty(head
))
1153 req
= list_entry(head
->next
,
1154 struct ceph_mds_request
, r_unsafe_dir_item
);
1155 } while (req
->r_tid
< last_tid
);
1157 spin_unlock(&ci
->i_unsafe_lock
);
1162 * We maintain a private dentry LRU.
1164 * FIXME: this needs to be changed to a per-mds lru to be useful.
1166 void ceph_dentry_lru_add(struct dentry
*dn
)
1168 struct ceph_dentry_info
*di
= ceph_dentry(dn
);
1169 struct ceph_mds_client
*mdsc
;
1171 dout("dentry_lru_add %p %p '%.*s'\n", di
, dn
,
1172 dn
->d_name
.len
, dn
->d_name
.name
);
1174 mdsc
= &ceph_sb_to_client(dn
->d_sb
)->mdsc
;
1175 spin_lock(&mdsc
->dentry_lru_lock
);
1176 list_add_tail(&di
->lru
, &mdsc
->dentry_lru
);
1178 spin_unlock(&mdsc
->dentry_lru_lock
);
1182 void ceph_dentry_lru_touch(struct dentry
*dn
)
1184 struct ceph_dentry_info
*di
= ceph_dentry(dn
);
1185 struct ceph_mds_client
*mdsc
;
1187 dout("dentry_lru_touch %p %p '%.*s' (offset %lld)\n", di
, dn
,
1188 dn
->d_name
.len
, dn
->d_name
.name
, di
->offset
);
1190 mdsc
= &ceph_sb_to_client(dn
->d_sb
)->mdsc
;
1191 spin_lock(&mdsc
->dentry_lru_lock
);
1192 list_move_tail(&di
->lru
, &mdsc
->dentry_lru
);
1193 spin_unlock(&mdsc
->dentry_lru_lock
);
1197 void ceph_dentry_lru_del(struct dentry
*dn
)
1199 struct ceph_dentry_info
*di
= ceph_dentry(dn
);
1200 struct ceph_mds_client
*mdsc
;
1202 dout("dentry_lru_del %p %p '%.*s'\n", di
, dn
,
1203 dn
->d_name
.len
, dn
->d_name
.name
);
1205 mdsc
= &ceph_sb_to_client(dn
->d_sb
)->mdsc
;
1206 spin_lock(&mdsc
->dentry_lru_lock
);
1207 list_del_init(&di
->lru
);
1209 spin_unlock(&mdsc
->dentry_lru_lock
);
1213 const struct file_operations ceph_dir_fops
= {
1214 .read
= ceph_read_dir
,
1215 .readdir
= ceph_readdir
,
1216 .llseek
= ceph_dir_llseek
,
1218 .release
= ceph_release
,
1219 .unlocked_ioctl
= ceph_ioctl
,
1220 .fsync
= ceph_dir_fsync
,
1223 const struct inode_operations ceph_dir_iops
= {
1224 .lookup
= ceph_lookup
,
1225 .permission
= ceph_permission
,
1226 .getattr
= ceph_getattr
,
1227 .setattr
= ceph_setattr
,
1228 .setxattr
= ceph_setxattr
,
1229 .getxattr
= ceph_getxattr
,
1230 .listxattr
= ceph_listxattr
,
1231 .removexattr
= ceph_removexattr
,
1232 .mknod
= ceph_mknod
,
1233 .symlink
= ceph_symlink
,
1234 .mkdir
= ceph_mkdir
,
1236 .unlink
= ceph_unlink
,
1237 .rmdir
= ceph_unlink
,
1238 .rename
= ceph_rename
,
1239 .create
= ceph_create
,
1242 struct dentry_operations ceph_dentry_ops
= {
1243 .d_revalidate
= ceph_d_revalidate
,
1244 .d_release
= ceph_dentry_release
,
1247 struct dentry_operations ceph_snapdir_dentry_ops
= {
1248 .d_revalidate
= ceph_snapdir_d_revalidate
,
1249 .d_release
= ceph_dentry_release
,
1252 struct dentry_operations ceph_snap_dentry_ops
= {
1253 .d_release
= ceph_dentry_release
,