1 // SPDX-License-Identifier: GPL-2.0
2 #include <linux/ceph/ceph_debug.h>
5 #include <linux/kernel.h>
6 #include <linux/sched/signal.h>
7 #include <linux/slab.h>
8 #include <linux/vmalloc.h>
9 #include <linux/wait.h>
10 #include <linux/writeback.h>
13 #include "mds_client.h"
15 #include <linux/ceph/decode.h>
16 #include <linux/ceph/messenger.h>
19 * Capability management
21 * The Ceph metadata servers control client access to inode metadata
22 * and file data by issuing capabilities, granting clients permission
23 * to read and/or write both inode field and file data to OSDs
24 * (storage nodes). Each capability consists of a set of bits
25 * indicating which operations are allowed.
27 * If the client holds a *_SHARED cap, the client has a coherent value
28 * that can be safely read from the cached inode.
30 * In the case of a *_EXCL (exclusive) or FILE_WR capabilities, the
31 * client is allowed to change inode attributes (e.g., file size,
32 * mtime), note its dirty state in the ceph_cap, and asynchronously
33 * flush that metadata change to the MDS.
35 * In the event of a conflicting operation (perhaps by another
36 * client), the MDS will revoke the conflicting client capabilities.
38 * In order for a client to cache an inode, it must hold a capability
39 * with at least one MDS server. When inodes are released, release
40 * notifications are batched and periodically sent en masse to the MDS
41 * cluster to release server state.
44 static u64
__get_oldest_flush_tid(struct ceph_mds_client
*mdsc
);
45 static void __kick_flushing_caps(struct ceph_mds_client
*mdsc
,
46 struct ceph_mds_session
*session
,
47 struct ceph_inode_info
*ci
,
48 u64 oldest_flush_tid
);
51 * Generate readable cap strings for debugging output.
53 #define MAX_CAP_STR 20
54 static char cap_str
[MAX_CAP_STR
][40];
55 static DEFINE_SPINLOCK(cap_str_lock
);
56 static int last_cap_str
;
58 static char *gcap_string(char *s
, int c
)
60 if (c
& CEPH_CAP_GSHARED
)
62 if (c
& CEPH_CAP_GEXCL
)
64 if (c
& CEPH_CAP_GCACHE
)
70 if (c
& CEPH_CAP_GBUFFER
)
72 if (c
& CEPH_CAP_GWREXTEND
)
74 if (c
& CEPH_CAP_GLAZYIO
)
79 const char *ceph_cap_string(int caps
)
85 spin_lock(&cap_str_lock
);
87 if (last_cap_str
== MAX_CAP_STR
)
89 spin_unlock(&cap_str_lock
);
93 if (caps
& CEPH_CAP_PIN
)
96 c
= (caps
>> CEPH_CAP_SAUTH
) & 3;
99 s
= gcap_string(s
, c
);
102 c
= (caps
>> CEPH_CAP_SLINK
) & 3;
105 s
= gcap_string(s
, c
);
108 c
= (caps
>> CEPH_CAP_SXATTR
) & 3;
111 s
= gcap_string(s
, c
);
114 c
= caps
>> CEPH_CAP_SFILE
;
117 s
= gcap_string(s
, c
);
126 void ceph_caps_init(struct ceph_mds_client
*mdsc
)
128 INIT_LIST_HEAD(&mdsc
->caps_list
);
129 spin_lock_init(&mdsc
->caps_list_lock
);
132 void ceph_caps_finalize(struct ceph_mds_client
*mdsc
)
134 struct ceph_cap
*cap
;
136 spin_lock(&mdsc
->caps_list_lock
);
137 while (!list_empty(&mdsc
->caps_list
)) {
138 cap
= list_first_entry(&mdsc
->caps_list
,
139 struct ceph_cap
, caps_item
);
140 list_del(&cap
->caps_item
);
141 kmem_cache_free(ceph_cap_cachep
, cap
);
143 mdsc
->caps_total_count
= 0;
144 mdsc
->caps_avail_count
= 0;
145 mdsc
->caps_use_count
= 0;
146 mdsc
->caps_reserve_count
= 0;
147 mdsc
->caps_min_count
= 0;
148 spin_unlock(&mdsc
->caps_list_lock
);
151 void ceph_adjust_caps_max_min(struct ceph_mds_client
*mdsc
,
152 struct ceph_mount_options
*fsopt
)
154 spin_lock(&mdsc
->caps_list_lock
);
155 mdsc
->caps_min_count
= fsopt
->max_readdir
;
156 if (mdsc
->caps_min_count
< 1024)
157 mdsc
->caps_min_count
= 1024;
158 mdsc
->caps_use_max
= fsopt
->caps_max
;
159 if (mdsc
->caps_use_max
> 0 &&
160 mdsc
->caps_use_max
< mdsc
->caps_min_count
)
161 mdsc
->caps_use_max
= mdsc
->caps_min_count
;
162 spin_unlock(&mdsc
->caps_list_lock
);
165 static void __ceph_unreserve_caps(struct ceph_mds_client
*mdsc
, int nr_caps
)
167 struct ceph_cap
*cap
;
171 BUG_ON(mdsc
->caps_reserve_count
< nr_caps
);
172 mdsc
->caps_reserve_count
-= nr_caps
;
173 if (mdsc
->caps_avail_count
>=
174 mdsc
->caps_reserve_count
+ mdsc
->caps_min_count
) {
175 mdsc
->caps_total_count
-= nr_caps
;
176 for (i
= 0; i
< nr_caps
; i
++) {
177 cap
= list_first_entry(&mdsc
->caps_list
,
178 struct ceph_cap
, caps_item
);
179 list_del(&cap
->caps_item
);
180 kmem_cache_free(ceph_cap_cachep
, cap
);
183 mdsc
->caps_avail_count
+= nr_caps
;
186 dout("%s: caps %d = %d used + %d resv + %d avail\n",
188 mdsc
->caps_total_count
, mdsc
->caps_use_count
,
189 mdsc
->caps_reserve_count
, mdsc
->caps_avail_count
);
190 BUG_ON(mdsc
->caps_total_count
!= mdsc
->caps_use_count
+
191 mdsc
->caps_reserve_count
+
192 mdsc
->caps_avail_count
);
197 * Called under mdsc->mutex.
199 int ceph_reserve_caps(struct ceph_mds_client
*mdsc
,
200 struct ceph_cap_reservation
*ctx
, int need
)
203 struct ceph_cap
*cap
;
208 bool trimmed
= false;
209 struct ceph_mds_session
*s
;
212 dout("reserve caps ctx=%p need=%d\n", ctx
, need
);
214 /* first reserve any caps that are already allocated */
215 spin_lock(&mdsc
->caps_list_lock
);
216 if (mdsc
->caps_avail_count
>= need
)
219 have
= mdsc
->caps_avail_count
;
220 mdsc
->caps_avail_count
-= have
;
221 mdsc
->caps_reserve_count
+= have
;
222 BUG_ON(mdsc
->caps_total_count
!= mdsc
->caps_use_count
+
223 mdsc
->caps_reserve_count
+
224 mdsc
->caps_avail_count
);
225 spin_unlock(&mdsc
->caps_list_lock
);
227 for (i
= have
; i
< need
; ) {
228 cap
= kmem_cache_alloc(ceph_cap_cachep
, GFP_NOFS
);
230 list_add(&cap
->caps_item
, &newcaps
);
237 for (j
= 0; j
< mdsc
->max_sessions
; j
++) {
238 s
= __ceph_lookup_mds_session(mdsc
, j
);
241 mutex_unlock(&mdsc
->mutex
);
243 mutex_lock(&s
->s_mutex
);
244 max_caps
= s
->s_nr_caps
- (need
- i
);
245 ceph_trim_caps(mdsc
, s
, max_caps
);
246 mutex_unlock(&s
->s_mutex
);
248 ceph_put_mds_session(s
);
249 mutex_lock(&mdsc
->mutex
);
253 spin_lock(&mdsc
->caps_list_lock
);
254 if (mdsc
->caps_avail_count
) {
256 if (mdsc
->caps_avail_count
>= need
- i
)
257 more_have
= need
- i
;
259 more_have
= mdsc
->caps_avail_count
;
263 mdsc
->caps_avail_count
-= more_have
;
264 mdsc
->caps_reserve_count
+= more_have
;
267 spin_unlock(&mdsc
->caps_list_lock
);
272 pr_warn("reserve caps ctx=%p ENOMEM need=%d got=%d\n",
273 ctx
, need
, have
+ alloc
);
279 BUG_ON(have
+ alloc
!= need
);
284 spin_lock(&mdsc
->caps_list_lock
);
285 mdsc
->caps_total_count
+= alloc
;
286 mdsc
->caps_reserve_count
+= alloc
;
287 list_splice(&newcaps
, &mdsc
->caps_list
);
289 BUG_ON(mdsc
->caps_total_count
!= mdsc
->caps_use_count
+
290 mdsc
->caps_reserve_count
+
291 mdsc
->caps_avail_count
);
294 __ceph_unreserve_caps(mdsc
, have
+ alloc
);
296 spin_unlock(&mdsc
->caps_list_lock
);
298 dout("reserve caps ctx=%p %d = %d used + %d resv + %d avail\n",
299 ctx
, mdsc
->caps_total_count
, mdsc
->caps_use_count
,
300 mdsc
->caps_reserve_count
, mdsc
->caps_avail_count
);
304 void ceph_unreserve_caps(struct ceph_mds_client
*mdsc
,
305 struct ceph_cap_reservation
*ctx
)
307 bool reclaim
= false;
311 dout("unreserve caps ctx=%p count=%d\n", ctx
, ctx
->count
);
312 spin_lock(&mdsc
->caps_list_lock
);
313 __ceph_unreserve_caps(mdsc
, ctx
->count
);
316 if (mdsc
->caps_use_max
> 0 &&
317 mdsc
->caps_use_count
> mdsc
->caps_use_max
)
319 spin_unlock(&mdsc
->caps_list_lock
);
322 ceph_reclaim_caps_nr(mdsc
, ctx
->used
);
325 struct ceph_cap
*ceph_get_cap(struct ceph_mds_client
*mdsc
,
326 struct ceph_cap_reservation
*ctx
)
328 struct ceph_cap
*cap
= NULL
;
330 /* temporary, until we do something about cap import/export */
332 cap
= kmem_cache_alloc(ceph_cap_cachep
, GFP_NOFS
);
334 spin_lock(&mdsc
->caps_list_lock
);
335 mdsc
->caps_use_count
++;
336 mdsc
->caps_total_count
++;
337 spin_unlock(&mdsc
->caps_list_lock
);
339 spin_lock(&mdsc
->caps_list_lock
);
340 if (mdsc
->caps_avail_count
) {
341 BUG_ON(list_empty(&mdsc
->caps_list
));
343 mdsc
->caps_avail_count
--;
344 mdsc
->caps_use_count
++;
345 cap
= list_first_entry(&mdsc
->caps_list
,
346 struct ceph_cap
, caps_item
);
347 list_del(&cap
->caps_item
);
349 BUG_ON(mdsc
->caps_total_count
!= mdsc
->caps_use_count
+
350 mdsc
->caps_reserve_count
+ mdsc
->caps_avail_count
);
352 spin_unlock(&mdsc
->caps_list_lock
);
358 spin_lock(&mdsc
->caps_list_lock
);
359 dout("get_cap ctx=%p (%d) %d = %d used + %d resv + %d avail\n",
360 ctx
, ctx
->count
, mdsc
->caps_total_count
, mdsc
->caps_use_count
,
361 mdsc
->caps_reserve_count
, mdsc
->caps_avail_count
);
363 BUG_ON(ctx
->count
> mdsc
->caps_reserve_count
);
364 BUG_ON(list_empty(&mdsc
->caps_list
));
368 mdsc
->caps_reserve_count
--;
369 mdsc
->caps_use_count
++;
371 cap
= list_first_entry(&mdsc
->caps_list
, struct ceph_cap
, caps_item
);
372 list_del(&cap
->caps_item
);
374 BUG_ON(mdsc
->caps_total_count
!= mdsc
->caps_use_count
+
375 mdsc
->caps_reserve_count
+ mdsc
->caps_avail_count
);
376 spin_unlock(&mdsc
->caps_list_lock
);
380 void ceph_put_cap(struct ceph_mds_client
*mdsc
, struct ceph_cap
*cap
)
382 spin_lock(&mdsc
->caps_list_lock
);
383 dout("put_cap %p %d = %d used + %d resv + %d avail\n",
384 cap
, mdsc
->caps_total_count
, mdsc
->caps_use_count
,
385 mdsc
->caps_reserve_count
, mdsc
->caps_avail_count
);
386 mdsc
->caps_use_count
--;
388 * Keep some preallocated caps around (ceph_min_count), to
389 * avoid lots of free/alloc churn.
391 if (mdsc
->caps_avail_count
>= mdsc
->caps_reserve_count
+
392 mdsc
->caps_min_count
) {
393 mdsc
->caps_total_count
--;
394 kmem_cache_free(ceph_cap_cachep
, cap
);
396 mdsc
->caps_avail_count
++;
397 list_add(&cap
->caps_item
, &mdsc
->caps_list
);
400 BUG_ON(mdsc
->caps_total_count
!= mdsc
->caps_use_count
+
401 mdsc
->caps_reserve_count
+ mdsc
->caps_avail_count
);
402 spin_unlock(&mdsc
->caps_list_lock
);
405 void ceph_reservation_status(struct ceph_fs_client
*fsc
,
406 int *total
, int *avail
, int *used
, int *reserved
,
409 struct ceph_mds_client
*mdsc
= fsc
->mdsc
;
411 spin_lock(&mdsc
->caps_list_lock
);
414 *total
= mdsc
->caps_total_count
;
416 *avail
= mdsc
->caps_avail_count
;
418 *used
= mdsc
->caps_use_count
;
420 *reserved
= mdsc
->caps_reserve_count
;
422 *min
= mdsc
->caps_min_count
;
424 spin_unlock(&mdsc
->caps_list_lock
);
428 * Find ceph_cap for given mds, if any.
430 * Called with i_ceph_lock held.
432 static struct ceph_cap
*__get_cap_for_mds(struct ceph_inode_info
*ci
, int mds
)
434 struct ceph_cap
*cap
;
435 struct rb_node
*n
= ci
->i_caps
.rb_node
;
438 cap
= rb_entry(n
, struct ceph_cap
, ci_node
);
441 else if (mds
> cap
->mds
)
449 struct ceph_cap
*ceph_get_cap_for_mds(struct ceph_inode_info
*ci
, int mds
)
451 struct ceph_cap
*cap
;
453 spin_lock(&ci
->i_ceph_lock
);
454 cap
= __get_cap_for_mds(ci
, mds
);
455 spin_unlock(&ci
->i_ceph_lock
);
460 * Return id of any MDS with a cap, preferably FILE_WR|BUFFER|EXCL, else -1.
462 static int __ceph_get_cap_mds(struct ceph_inode_info
*ci
)
464 struct ceph_cap
*cap
;
468 /* prefer mds with WR|BUFFER|EXCL caps */
469 for (p
= rb_first(&ci
->i_caps
); p
; p
= rb_next(p
)) {
470 cap
= rb_entry(p
, struct ceph_cap
, ci_node
);
472 if (cap
->issued
& (CEPH_CAP_FILE_WR
|
473 CEPH_CAP_FILE_BUFFER
|
480 int ceph_get_cap_mds(struct inode
*inode
)
482 struct ceph_inode_info
*ci
= ceph_inode(inode
);
484 spin_lock(&ci
->i_ceph_lock
);
485 mds
= __ceph_get_cap_mds(ceph_inode(inode
));
486 spin_unlock(&ci
->i_ceph_lock
);
491 * Called under i_ceph_lock.
493 static void __insert_cap_node(struct ceph_inode_info
*ci
,
494 struct ceph_cap
*new)
496 struct rb_node
**p
= &ci
->i_caps
.rb_node
;
497 struct rb_node
*parent
= NULL
;
498 struct ceph_cap
*cap
= NULL
;
502 cap
= rb_entry(parent
, struct ceph_cap
, ci_node
);
503 if (new->mds
< cap
->mds
)
505 else if (new->mds
> cap
->mds
)
511 rb_link_node(&new->ci_node
, parent
, p
);
512 rb_insert_color(&new->ci_node
, &ci
->i_caps
);
516 * (re)set cap hold timeouts, which control the delayed release
517 * of unused caps back to the MDS. Should be called on cap use.
519 static void __cap_set_timeouts(struct ceph_mds_client
*mdsc
,
520 struct ceph_inode_info
*ci
)
522 struct ceph_mount_options
*opt
= mdsc
->fsc
->mount_options
;
524 ci
->i_hold_caps_min
= round_jiffies(jiffies
+
525 opt
->caps_wanted_delay_min
* HZ
);
526 ci
->i_hold_caps_max
= round_jiffies(jiffies
+
527 opt
->caps_wanted_delay_max
* HZ
);
528 dout("__cap_set_timeouts %p min %lu max %lu\n", &ci
->vfs_inode
,
529 ci
->i_hold_caps_min
- jiffies
, ci
->i_hold_caps_max
- jiffies
);
533 * (Re)queue cap at the end of the delayed cap release list.
535 * If I_FLUSH is set, leave the inode at the front of the list.
537 * Caller holds i_ceph_lock
538 * -> we take mdsc->cap_delay_lock
540 static void __cap_delay_requeue(struct ceph_mds_client
*mdsc
,
541 struct ceph_inode_info
*ci
,
544 dout("__cap_delay_requeue %p flags %d at %lu\n", &ci
->vfs_inode
,
545 ci
->i_ceph_flags
, ci
->i_hold_caps_max
);
546 if (!mdsc
->stopping
) {
547 spin_lock(&mdsc
->cap_delay_lock
);
548 if (!list_empty(&ci
->i_cap_delay_list
)) {
549 if (ci
->i_ceph_flags
& CEPH_I_FLUSH
)
551 list_del_init(&ci
->i_cap_delay_list
);
554 __cap_set_timeouts(mdsc
, ci
);
555 list_add_tail(&ci
->i_cap_delay_list
, &mdsc
->cap_delay_list
);
557 spin_unlock(&mdsc
->cap_delay_lock
);
562 * Queue an inode for immediate writeback. Mark inode with I_FLUSH,
563 * indicating we should send a cap message to flush dirty metadata
564 * asap, and move to the front of the delayed cap list.
566 static void __cap_delay_requeue_front(struct ceph_mds_client
*mdsc
,
567 struct ceph_inode_info
*ci
)
569 dout("__cap_delay_requeue_front %p\n", &ci
->vfs_inode
);
570 spin_lock(&mdsc
->cap_delay_lock
);
571 ci
->i_ceph_flags
|= CEPH_I_FLUSH
;
572 if (!list_empty(&ci
->i_cap_delay_list
))
573 list_del_init(&ci
->i_cap_delay_list
);
574 list_add(&ci
->i_cap_delay_list
, &mdsc
->cap_delay_list
);
575 spin_unlock(&mdsc
->cap_delay_lock
);
579 * Cancel delayed work on cap.
581 * Caller must hold i_ceph_lock.
583 static void __cap_delay_cancel(struct ceph_mds_client
*mdsc
,
584 struct ceph_inode_info
*ci
)
586 dout("__cap_delay_cancel %p\n", &ci
->vfs_inode
);
587 if (list_empty(&ci
->i_cap_delay_list
))
589 spin_lock(&mdsc
->cap_delay_lock
);
590 list_del_init(&ci
->i_cap_delay_list
);
591 spin_unlock(&mdsc
->cap_delay_lock
);
595 * Common issue checks for add_cap, handle_cap_grant.
597 static void __check_cap_issue(struct ceph_inode_info
*ci
, struct ceph_cap
*cap
,
600 unsigned had
= __ceph_caps_issued(ci
, NULL
);
603 * Each time we receive FILE_CACHE anew, we increment
606 if ((issued
& (CEPH_CAP_FILE_CACHE
|CEPH_CAP_FILE_LAZYIO
)) &&
607 (had
& (CEPH_CAP_FILE_CACHE
|CEPH_CAP_FILE_LAZYIO
)) == 0) {
612 * If FILE_SHARED is newly issued, mark dir not complete. We don't
613 * know what happened to this directory while we didn't have the cap.
614 * If FILE_SHARED is being revoked, also mark dir not complete. It
615 * stops on-going cached readdir.
617 if ((issued
& CEPH_CAP_FILE_SHARED
) != (had
& CEPH_CAP_FILE_SHARED
)) {
618 if (issued
& CEPH_CAP_FILE_SHARED
)
619 atomic_inc(&ci
->i_shared_gen
);
620 if (S_ISDIR(ci
->vfs_inode
.i_mode
)) {
621 dout(" marking %p NOT complete\n", &ci
->vfs_inode
);
622 __ceph_dir_clear_complete(ci
);
628 * Add a capability under the given MDS session.
630 * Caller should hold session snap_rwsem (read) and s_mutex.
632 * @fmode is the open file mode, if we are opening a file, otherwise
633 * it is < 0. (This is so we can atomically add the cap and add an
634 * open file reference to it.)
636 void ceph_add_cap(struct inode
*inode
,
637 struct ceph_mds_session
*session
, u64 cap_id
,
638 int fmode
, unsigned issued
, unsigned wanted
,
639 unsigned seq
, unsigned mseq
, u64 realmino
, int flags
,
640 struct ceph_cap
**new_cap
)
642 struct ceph_mds_client
*mdsc
= ceph_inode_to_client(inode
)->mdsc
;
643 struct ceph_inode_info
*ci
= ceph_inode(inode
);
644 struct ceph_cap
*cap
;
645 int mds
= session
->s_mds
;
648 dout("add_cap %p mds%d cap %llx %s seq %d\n", inode
,
649 session
->s_mds
, cap_id
, ceph_cap_string(issued
), seq
);
652 * If we are opening the file, include file mode wanted bits
656 wanted
|= ceph_caps_for_mode(fmode
);
658 cap
= __get_cap_for_mds(ci
, mds
);
664 cap
->implemented
= 0;
670 __insert_cap_node(ci
, cap
);
672 /* add to session cap list */
673 cap
->session
= session
;
674 spin_lock(&session
->s_cap_lock
);
675 list_add_tail(&cap
->session_caps
, &session
->s_caps
);
676 session
->s_nr_caps
++;
677 spin_unlock(&session
->s_cap_lock
);
679 spin_lock(&session
->s_cap_lock
);
680 list_move_tail(&cap
->session_caps
, &session
->s_caps
);
681 spin_unlock(&session
->s_cap_lock
);
683 if (cap
->cap_gen
< session
->s_cap_gen
)
684 cap
->issued
= cap
->implemented
= CEPH_CAP_PIN
;
687 * auth mds of the inode changed. we received the cap export
688 * message, but still haven't received the cap import message.
689 * handle_cap_export() updated the new auth MDS' cap.
691 * "ceph_seq_cmp(seq, cap->seq) <= 0" means we are processing
692 * a message that was send before the cap import message. So
695 if (ceph_seq_cmp(seq
, cap
->seq
) <= 0) {
696 WARN_ON(cap
!= ci
->i_auth_cap
);
697 WARN_ON(cap
->cap_id
!= cap_id
);
700 issued
|= cap
->issued
;
701 flags
|= CEPH_CAP_FLAG_AUTH
;
705 if (!ci
->i_snap_realm
||
706 ((flags
& CEPH_CAP_FLAG_AUTH
) &&
707 realmino
!= (u64
)-1 && ci
->i_snap_realm
->ino
!= realmino
)) {
709 * add this inode to the appropriate snap realm
711 struct ceph_snap_realm
*realm
= ceph_lookup_snap_realm(mdsc
,
714 struct ceph_snap_realm
*oldrealm
= ci
->i_snap_realm
;
716 spin_lock(&oldrealm
->inodes_with_caps_lock
);
717 list_del_init(&ci
->i_snap_realm_item
);
718 spin_unlock(&oldrealm
->inodes_with_caps_lock
);
721 spin_lock(&realm
->inodes_with_caps_lock
);
722 list_add(&ci
->i_snap_realm_item
,
723 &realm
->inodes_with_caps
);
724 ci
->i_snap_realm
= realm
;
725 if (realm
->ino
== ci
->i_vino
.ino
)
726 realm
->inode
= inode
;
727 spin_unlock(&realm
->inodes_with_caps_lock
);
730 ceph_put_snap_realm(mdsc
, oldrealm
);
732 pr_err("ceph_add_cap: couldn't find snap realm %llx\n",
738 __check_cap_issue(ci
, cap
, issued
);
741 * If we are issued caps we don't want, or the mds' wanted
742 * value appears to be off, queue a check so we'll release
743 * later and/or update the mds wanted value.
745 actual_wanted
= __ceph_caps_wanted(ci
);
746 if ((wanted
& ~actual_wanted
) ||
747 (issued
& ~actual_wanted
& CEPH_CAP_ANY_WR
)) {
748 dout(" issued %s, mds wanted %s, actual %s, queueing\n",
749 ceph_cap_string(issued
), ceph_cap_string(wanted
),
750 ceph_cap_string(actual_wanted
));
751 __cap_delay_requeue(mdsc
, ci
, true);
754 if (flags
& CEPH_CAP_FLAG_AUTH
) {
755 if (!ci
->i_auth_cap
||
756 ceph_seq_cmp(ci
->i_auth_cap
->mseq
, mseq
) < 0) {
757 ci
->i_auth_cap
= cap
;
758 cap
->mds_wanted
= wanted
;
761 WARN_ON(ci
->i_auth_cap
== cap
);
764 dout("add_cap inode %p (%llx.%llx) cap %p %s now %s seq %d mds%d\n",
765 inode
, ceph_vinop(inode
), cap
, ceph_cap_string(issued
),
766 ceph_cap_string(issued
|cap
->issued
), seq
, mds
);
767 cap
->cap_id
= cap_id
;
768 cap
->issued
= issued
;
769 cap
->implemented
|= issued
;
770 if (ceph_seq_cmp(mseq
, cap
->mseq
) > 0)
771 cap
->mds_wanted
= wanted
;
773 cap
->mds_wanted
|= wanted
;
775 cap
->issue_seq
= seq
;
777 cap
->cap_gen
= session
->s_cap_gen
;
780 __ceph_get_fmode(ci
, fmode
);
784 * Return true if cap has not timed out and belongs to the current
785 * generation of the MDS session (i.e. has not gone 'stale' due to
786 * us losing touch with the mds).
788 static int __cap_is_valid(struct ceph_cap
*cap
)
793 spin_lock(&cap
->session
->s_gen_ttl_lock
);
794 gen
= cap
->session
->s_cap_gen
;
795 ttl
= cap
->session
->s_cap_ttl
;
796 spin_unlock(&cap
->session
->s_gen_ttl_lock
);
798 if (cap
->cap_gen
< gen
|| time_after_eq(jiffies
, ttl
)) {
799 dout("__cap_is_valid %p cap %p issued %s "
800 "but STALE (gen %u vs %u)\n", &cap
->ci
->vfs_inode
,
801 cap
, ceph_cap_string(cap
->issued
), cap
->cap_gen
, gen
);
809 * Return set of valid cap bits issued to us. Note that caps time
810 * out, and may be invalidated in bulk if the client session times out
811 * and session->s_cap_gen is bumped.
813 int __ceph_caps_issued(struct ceph_inode_info
*ci
, int *implemented
)
815 int have
= ci
->i_snap_caps
;
816 struct ceph_cap
*cap
;
821 for (p
= rb_first(&ci
->i_caps
); p
; p
= rb_next(p
)) {
822 cap
= rb_entry(p
, struct ceph_cap
, ci_node
);
823 if (!__cap_is_valid(cap
))
825 dout("__ceph_caps_issued %p cap %p issued %s\n",
826 &ci
->vfs_inode
, cap
, ceph_cap_string(cap
->issued
));
829 *implemented
|= cap
->implemented
;
832 * exclude caps issued by non-auth MDS, but are been revoking
833 * by the auth MDS. The non-auth MDS should be revoking/exporting
834 * these caps, but the message is delayed.
836 if (ci
->i_auth_cap
) {
837 cap
= ci
->i_auth_cap
;
838 have
&= ~cap
->implemented
| cap
->issued
;
844 * Get cap bits issued by caps other than @ocap
846 int __ceph_caps_issued_other(struct ceph_inode_info
*ci
, struct ceph_cap
*ocap
)
848 int have
= ci
->i_snap_caps
;
849 struct ceph_cap
*cap
;
852 for (p
= rb_first(&ci
->i_caps
); p
; p
= rb_next(p
)) {
853 cap
= rb_entry(p
, struct ceph_cap
, ci_node
);
856 if (!__cap_is_valid(cap
))
864 * Move a cap to the end of the LRU (oldest caps at list head, newest
867 static void __touch_cap(struct ceph_cap
*cap
)
869 struct ceph_mds_session
*s
= cap
->session
;
871 spin_lock(&s
->s_cap_lock
);
872 if (!s
->s_cap_iterator
) {
873 dout("__touch_cap %p cap %p mds%d\n", &cap
->ci
->vfs_inode
, cap
,
875 list_move_tail(&cap
->session_caps
, &s
->s_caps
);
877 dout("__touch_cap %p cap %p mds%d NOP, iterating over caps\n",
878 &cap
->ci
->vfs_inode
, cap
, s
->s_mds
);
880 spin_unlock(&s
->s_cap_lock
);
884 * Check if we hold the given mask. If so, move the cap(s) to the
885 * front of their respective LRUs. (This is the preferred way for
886 * callers to check for caps they want.)
888 int __ceph_caps_issued_mask(struct ceph_inode_info
*ci
, int mask
, int touch
)
890 struct ceph_cap
*cap
;
892 int have
= ci
->i_snap_caps
;
894 if ((have
& mask
) == mask
) {
895 dout("__ceph_caps_issued_mask ino 0x%lx snap issued %s"
896 " (mask %s)\n", ci
->vfs_inode
.i_ino
,
897 ceph_cap_string(have
),
898 ceph_cap_string(mask
));
902 for (p
= rb_first(&ci
->i_caps
); p
; p
= rb_next(p
)) {
903 cap
= rb_entry(p
, struct ceph_cap
, ci_node
);
904 if (!__cap_is_valid(cap
))
906 if ((cap
->issued
& mask
) == mask
) {
907 dout("__ceph_caps_issued_mask ino 0x%lx cap %p issued %s"
908 " (mask %s)\n", ci
->vfs_inode
.i_ino
, cap
,
909 ceph_cap_string(cap
->issued
),
910 ceph_cap_string(mask
));
916 /* does a combination of caps satisfy mask? */
918 if ((have
& mask
) == mask
) {
919 dout("__ceph_caps_issued_mask ino 0x%lx combo issued %s"
920 " (mask %s)\n", ci
->vfs_inode
.i_ino
,
921 ceph_cap_string(cap
->issued
),
922 ceph_cap_string(mask
));
926 /* touch this + preceding caps */
928 for (q
= rb_first(&ci
->i_caps
); q
!= p
;
930 cap
= rb_entry(q
, struct ceph_cap
,
932 if (!__cap_is_valid(cap
))
945 * Return true if mask caps are currently being revoked by an MDS.
947 int __ceph_caps_revoking_other(struct ceph_inode_info
*ci
,
948 struct ceph_cap
*ocap
, int mask
)
950 struct ceph_cap
*cap
;
953 for (p
= rb_first(&ci
->i_caps
); p
; p
= rb_next(p
)) {
954 cap
= rb_entry(p
, struct ceph_cap
, ci_node
);
956 (cap
->implemented
& ~cap
->issued
& mask
))
962 int ceph_caps_revoking(struct ceph_inode_info
*ci
, int mask
)
964 struct inode
*inode
= &ci
->vfs_inode
;
967 spin_lock(&ci
->i_ceph_lock
);
968 ret
= __ceph_caps_revoking_other(ci
, NULL
, mask
);
969 spin_unlock(&ci
->i_ceph_lock
);
970 dout("ceph_caps_revoking %p %s = %d\n", inode
,
971 ceph_cap_string(mask
), ret
);
975 int __ceph_caps_used(struct ceph_inode_info
*ci
)
979 used
|= CEPH_CAP_PIN
;
981 used
|= CEPH_CAP_FILE_RD
;
982 if (ci
->i_rdcache_ref
||
983 (!S_ISDIR(ci
->vfs_inode
.i_mode
) && /* ignore readdir cache */
984 ci
->vfs_inode
.i_data
.nrpages
))
985 used
|= CEPH_CAP_FILE_CACHE
;
987 used
|= CEPH_CAP_FILE_WR
;
988 if (ci
->i_wb_ref
|| ci
->i_wrbuffer_ref
)
989 used
|= CEPH_CAP_FILE_BUFFER
;
994 * wanted, by virtue of open file modes
996 int __ceph_caps_file_wanted(struct ceph_inode_info
*ci
)
999 for (i
= 0; i
< CEPH_FILE_MODE_BITS
; i
++) {
1000 if (ci
->i_nr_by_mode
[i
])
1005 return ceph_caps_for_mode(bits
>> 1);
1009 * Return caps we have registered with the MDS(s) as 'wanted'.
1011 int __ceph_caps_mds_wanted(struct ceph_inode_info
*ci
, bool check
)
1013 struct ceph_cap
*cap
;
1017 for (p
= rb_first(&ci
->i_caps
); p
; p
= rb_next(p
)) {
1018 cap
= rb_entry(p
, struct ceph_cap
, ci_node
);
1019 if (check
&& !__cap_is_valid(cap
))
1021 if (cap
== ci
->i_auth_cap
)
1022 mds_wanted
|= cap
->mds_wanted
;
1024 mds_wanted
|= (cap
->mds_wanted
& ~CEPH_CAP_ANY_FILE_WR
);
1030 * called under i_ceph_lock
1032 static int __ceph_is_single_caps(struct ceph_inode_info
*ci
)
1034 return rb_first(&ci
->i_caps
) == rb_last(&ci
->i_caps
);
1037 static int __ceph_is_any_caps(struct ceph_inode_info
*ci
)
1039 return !RB_EMPTY_ROOT(&ci
->i_caps
);
1042 int ceph_is_any_caps(struct inode
*inode
)
1044 struct ceph_inode_info
*ci
= ceph_inode(inode
);
1047 spin_lock(&ci
->i_ceph_lock
);
1048 ret
= __ceph_is_any_caps(ci
);
1049 spin_unlock(&ci
->i_ceph_lock
);
1054 static void drop_inode_snap_realm(struct ceph_inode_info
*ci
)
1056 struct ceph_snap_realm
*realm
= ci
->i_snap_realm
;
1057 spin_lock(&realm
->inodes_with_caps_lock
);
1058 list_del_init(&ci
->i_snap_realm_item
);
1059 ci
->i_snap_realm_counter
++;
1060 ci
->i_snap_realm
= NULL
;
1061 if (realm
->ino
== ci
->i_vino
.ino
)
1062 realm
->inode
= NULL
;
1063 spin_unlock(&realm
->inodes_with_caps_lock
);
1064 ceph_put_snap_realm(ceph_sb_to_client(ci
->vfs_inode
.i_sb
)->mdsc
,
1069 * Remove a cap. Take steps to deal with a racing iterate_session_caps.
1071 * caller should hold i_ceph_lock.
1072 * caller will not hold session s_mutex if called from destroy_inode.
1074 void __ceph_remove_cap(struct ceph_cap
*cap
, bool queue_release
)
1076 struct ceph_mds_session
*session
= cap
->session
;
1077 struct ceph_inode_info
*ci
= cap
->ci
;
1078 struct ceph_mds_client
*mdsc
=
1079 ceph_sb_to_client(ci
->vfs_inode
.i_sb
)->mdsc
;
1082 dout("__ceph_remove_cap %p from %p\n", cap
, &ci
->vfs_inode
);
1084 /* remove from session list */
1085 spin_lock(&session
->s_cap_lock
);
1086 if (session
->s_cap_iterator
== cap
) {
1087 /* not yet, we are iterating over this very cap */
1088 dout("__ceph_remove_cap delaying %p removal from session %p\n",
1091 list_del_init(&cap
->session_caps
);
1092 session
->s_nr_caps
--;
1093 cap
->session
= NULL
;
1096 /* protect backpointer with s_cap_lock: see iterate_session_caps */
1100 * s_cap_reconnect is protected by s_cap_lock. no one changes
1101 * s_cap_gen while session is in the reconnect state.
1103 if (queue_release
&&
1104 (!session
->s_cap_reconnect
|| cap
->cap_gen
== session
->s_cap_gen
)) {
1105 cap
->queue_release
= 1;
1107 __ceph_queue_cap_release(session
, cap
);
1111 cap
->queue_release
= 0;
1113 cap
->cap_ino
= ci
->i_vino
.ino
;
1115 spin_unlock(&session
->s_cap_lock
);
1117 /* remove from inode list */
1118 rb_erase(&cap
->ci_node
, &ci
->i_caps
);
1119 if (ci
->i_auth_cap
== cap
)
1120 ci
->i_auth_cap
= NULL
;
1123 ceph_put_cap(mdsc
, cap
);
1125 /* when reconnect denied, we remove session caps forcibly,
1126 * i_wr_ref can be non-zero. If there are ongoing write,
1127 * keep i_snap_realm.
1129 if (!__ceph_is_any_caps(ci
) && ci
->i_wr_ref
== 0 && ci
->i_snap_realm
)
1130 drop_inode_snap_realm(ci
);
1132 if (!__ceph_is_any_real_caps(ci
))
1133 __cap_delay_cancel(mdsc
, ci
);
1136 struct cap_msg_args
{
1137 struct ceph_mds_session
*session
;
1138 u64 ino
, cid
, follows
;
1139 u64 flush_tid
, oldest_flush_tid
, size
, max_size
;
1141 struct ceph_buffer
*xattr_buf
;
1142 struct timespec64 atime
, mtime
, ctime
;
1143 int op
, caps
, wanted
, dirty
;
1144 u32 seq
, issue_seq
, mseq
, time_warp_seq
;
1153 * Build and send a cap message to the given MDS.
1155 * Caller should be holding s_mutex.
1157 static int send_cap_msg(struct cap_msg_args
*arg
)
1159 struct ceph_mds_caps
*fc
;
1160 struct ceph_msg
*msg
;
1163 struct timespec64 zerotime
= {0};
1164 struct ceph_osd_client
*osdc
= &arg
->session
->s_mdsc
->fsc
->client
->osdc
;
1166 dout("send_cap_msg %s %llx %llx caps %s wanted %s dirty %s"
1167 " seq %u/%u tid %llu/%llu mseq %u follows %lld size %llu/%llu"
1168 " xattr_ver %llu xattr_len %d\n", ceph_cap_op_name(arg
->op
),
1169 arg
->cid
, arg
->ino
, ceph_cap_string(arg
->caps
),
1170 ceph_cap_string(arg
->wanted
), ceph_cap_string(arg
->dirty
),
1171 arg
->seq
, arg
->issue_seq
, arg
->flush_tid
, arg
->oldest_flush_tid
,
1172 arg
->mseq
, arg
->follows
, arg
->size
, arg
->max_size
,
1174 arg
->xattr_buf
? (int)arg
->xattr_buf
->vec
.iov_len
: 0);
1176 /* flock buffer size + inline version + inline data size +
1177 * osd_epoch_barrier + oldest_flush_tid */
1178 extra_len
= 4 + 8 + 4 + 4 + 8 + 4 + 4 + 4 + 8 + 8 + 4;
1179 msg
= ceph_msg_new(CEPH_MSG_CLIENT_CAPS
, sizeof(*fc
) + extra_len
,
1184 msg
->hdr
.version
= cpu_to_le16(10);
1185 msg
->hdr
.tid
= cpu_to_le64(arg
->flush_tid
);
1187 fc
= msg
->front
.iov_base
;
1188 memset(fc
, 0, sizeof(*fc
));
1190 fc
->cap_id
= cpu_to_le64(arg
->cid
);
1191 fc
->op
= cpu_to_le32(arg
->op
);
1192 fc
->seq
= cpu_to_le32(arg
->seq
);
1193 fc
->issue_seq
= cpu_to_le32(arg
->issue_seq
);
1194 fc
->migrate_seq
= cpu_to_le32(arg
->mseq
);
1195 fc
->caps
= cpu_to_le32(arg
->caps
);
1196 fc
->wanted
= cpu_to_le32(arg
->wanted
);
1197 fc
->dirty
= cpu_to_le32(arg
->dirty
);
1198 fc
->ino
= cpu_to_le64(arg
->ino
);
1199 fc
->snap_follows
= cpu_to_le64(arg
->follows
);
1201 fc
->size
= cpu_to_le64(arg
->size
);
1202 fc
->max_size
= cpu_to_le64(arg
->max_size
);
1203 ceph_encode_timespec64(&fc
->mtime
, &arg
->mtime
);
1204 ceph_encode_timespec64(&fc
->atime
, &arg
->atime
);
1205 ceph_encode_timespec64(&fc
->ctime
, &arg
->ctime
);
1206 fc
->time_warp_seq
= cpu_to_le32(arg
->time_warp_seq
);
1208 fc
->uid
= cpu_to_le32(from_kuid(&init_user_ns
, arg
->uid
));
1209 fc
->gid
= cpu_to_le32(from_kgid(&init_user_ns
, arg
->gid
));
1210 fc
->mode
= cpu_to_le32(arg
->mode
);
1212 fc
->xattr_version
= cpu_to_le64(arg
->xattr_version
);
1213 if (arg
->xattr_buf
) {
1214 msg
->middle
= ceph_buffer_get(arg
->xattr_buf
);
1215 fc
->xattr_len
= cpu_to_le32(arg
->xattr_buf
->vec
.iov_len
);
1216 msg
->hdr
.middle_len
= cpu_to_le32(arg
->xattr_buf
->vec
.iov_len
);
1220 /* flock buffer size (version 2) */
1221 ceph_encode_32(&p
, 0);
1222 /* inline version (version 4) */
1223 ceph_encode_64(&p
, arg
->inline_data
? 0 : CEPH_INLINE_NONE
);
1224 /* inline data size */
1225 ceph_encode_32(&p
, 0);
1227 * osd_epoch_barrier (version 5)
1228 * The epoch_barrier is protected osdc->lock, so READ_ONCE here in
1229 * case it was recently changed
1231 ceph_encode_32(&p
, READ_ONCE(osdc
->epoch_barrier
));
1232 /* oldest_flush_tid (version 6) */
1233 ceph_encode_64(&p
, arg
->oldest_flush_tid
);
1236 * caller_uid/caller_gid (version 7)
1238 * Currently, we don't properly track which caller dirtied the caps
1239 * last, and force a flush of them when there is a conflict. For now,
1240 * just set this to 0:0, to emulate how the MDS has worked up to now.
1242 ceph_encode_32(&p
, 0);
1243 ceph_encode_32(&p
, 0);
1245 /* pool namespace (version 8) (mds always ignores this) */
1246 ceph_encode_32(&p
, 0);
1249 * btime and change_attr (version 9)
1251 * We just zero these out for now, as the MDS ignores them unless
1252 * the requisite feature flags are set (which we don't do yet).
1254 ceph_encode_timespec64(p
, &zerotime
);
1255 p
+= sizeof(struct ceph_timespec
);
1256 ceph_encode_64(&p
, 0);
1258 /* Advisory flags (version 10) */
1259 ceph_encode_32(&p
, arg
->flags
);
1261 ceph_con_send(&arg
->session
->s_con
, msg
);
1266 * Queue cap releases when an inode is dropped from our cache. Since
1267 * inode is about to be destroyed, there is no need for i_ceph_lock.
1269 void __ceph_remove_caps(struct inode
*inode
)
1271 struct ceph_inode_info
*ci
= ceph_inode(inode
);
1274 p
= rb_first(&ci
->i_caps
);
1276 struct ceph_cap
*cap
= rb_entry(p
, struct ceph_cap
, ci_node
);
1278 __ceph_remove_cap(cap
, true);
1283 * Send a cap msg on the given inode. Update our caps state, then
1284 * drop i_ceph_lock and send the message.
1286 * Make note of max_size reported/requested from mds, revoked caps
1287 * that have now been implemented.
1289 * Make half-hearted attempt ot to invalidate page cache if we are
1290 * dropping RDCACHE. Note that this will leave behind locked pages
1291 * that we'll then need to deal with elsewhere.
1293 * Return non-zero if delayed release, or we experienced an error
1294 * such that the caller should requeue + retry later.
1296 * called with i_ceph_lock, then drops it.
1297 * caller should hold snap_rwsem (read), s_mutex.
1299 static int __send_cap(struct ceph_mds_client
*mdsc
, struct ceph_cap
*cap
,
1300 int op
, bool sync
, int used
, int want
, int retain
,
1301 int flushing
, u64 flush_tid
, u64 oldest_flush_tid
)
1302 __releases(cap
->ci
->i_ceph_lock
)
1304 struct ceph_inode_info
*ci
= cap
->ci
;
1305 struct inode
*inode
= &ci
->vfs_inode
;
1306 struct cap_msg_args arg
;
1312 held
= cap
->issued
| cap
->implemented
;
1313 revoking
= cap
->implemented
& ~cap
->issued
;
1314 retain
&= ~revoking
;
1316 dout("__send_cap %p cap %p session %p %s -> %s (revoking %s)\n",
1317 inode
, cap
, cap
->session
,
1318 ceph_cap_string(held
), ceph_cap_string(held
& retain
),
1319 ceph_cap_string(revoking
));
1320 BUG_ON((retain
& CEPH_CAP_PIN
) == 0);
1322 arg
.session
= cap
->session
;
1324 /* don't release wanted unless we've waited a bit. */
1325 if ((ci
->i_ceph_flags
& CEPH_I_NODELAY
) == 0 &&
1326 time_before(jiffies
, ci
->i_hold_caps_min
)) {
1327 dout(" delaying issued %s -> %s, wanted %s -> %s on send\n",
1328 ceph_cap_string(cap
->issued
),
1329 ceph_cap_string(cap
->issued
& retain
),
1330 ceph_cap_string(cap
->mds_wanted
),
1331 ceph_cap_string(want
));
1332 want
|= cap
->mds_wanted
;
1333 retain
|= cap
->issued
;
1336 ci
->i_ceph_flags
&= ~(CEPH_I_NODELAY
| CEPH_I_FLUSH
);
1337 if (want
& ~cap
->mds_wanted
) {
1338 /* user space may open/close single file frequently.
1339 * This avoids droping mds_wanted immediately after
1340 * requesting new mds_wanted.
1342 __cap_set_timeouts(mdsc
, ci
);
1345 cap
->issued
&= retain
; /* drop bits we don't want */
1346 if (cap
->implemented
& ~cap
->issued
) {
1348 * Wake up any waiters on wanted -> needed transition.
1349 * This is due to the weird transition from buffered
1350 * to sync IO... we need to flush dirty pages _before_
1351 * allowing sync writes to avoid reordering.
1355 cap
->implemented
&= cap
->issued
| used
;
1356 cap
->mds_wanted
= want
;
1358 arg
.ino
= ceph_vino(inode
).ino
;
1359 arg
.cid
= cap
->cap_id
;
1360 arg
.follows
= flushing
? ci
->i_head_snapc
->seq
: 0;
1361 arg
.flush_tid
= flush_tid
;
1362 arg
.oldest_flush_tid
= oldest_flush_tid
;
1364 arg
.size
= inode
->i_size
;
1365 ci
->i_reported_size
= arg
.size
;
1366 arg
.max_size
= ci
->i_wanted_max_size
;
1367 ci
->i_requested_max_size
= arg
.max_size
;
1369 if (flushing
& CEPH_CAP_XATTR_EXCL
) {
1370 __ceph_build_xattrs_blob(ci
);
1371 arg
.xattr_version
= ci
->i_xattrs
.version
;
1372 arg
.xattr_buf
= ci
->i_xattrs
.blob
;
1374 arg
.xattr_buf
= NULL
;
1377 arg
.mtime
= inode
->i_mtime
;
1378 arg
.atime
= inode
->i_atime
;
1379 arg
.ctime
= inode
->i_ctime
;
1382 arg
.caps
= cap
->implemented
;
1384 arg
.dirty
= flushing
;
1387 arg
.issue_seq
= cap
->issue_seq
;
1388 arg
.mseq
= cap
->mseq
;
1389 arg
.time_warp_seq
= ci
->i_time_warp_seq
;
1391 arg
.uid
= inode
->i_uid
;
1392 arg
.gid
= inode
->i_gid
;
1393 arg
.mode
= inode
->i_mode
;
1395 arg
.inline_data
= ci
->i_inline_version
!= CEPH_INLINE_NONE
;
1396 if (list_empty(&ci
->i_cap_snaps
))
1397 arg
.flags
= CEPH_CLIENT_CAPS_NO_CAPSNAP
;
1399 arg
.flags
= CEPH_CLIENT_CAPS_PENDING_CAPSNAP
;
1401 arg
.flags
|= CEPH_CLIENT_CAPS_SYNC
;
1403 spin_unlock(&ci
->i_ceph_lock
);
1405 ret
= send_cap_msg(&arg
);
1407 dout("error sending cap msg, must requeue %p\n", inode
);
1412 wake_up_all(&ci
->i_cap_wq
);
1417 static inline int __send_flush_snap(struct inode
*inode
,
1418 struct ceph_mds_session
*session
,
1419 struct ceph_cap_snap
*capsnap
,
1420 u32 mseq
, u64 oldest_flush_tid
)
1422 struct cap_msg_args arg
;
1424 arg
.session
= session
;
1425 arg
.ino
= ceph_vino(inode
).ino
;
1427 arg
.follows
= capsnap
->follows
;
1428 arg
.flush_tid
= capsnap
->cap_flush
.tid
;
1429 arg
.oldest_flush_tid
= oldest_flush_tid
;
1431 arg
.size
= capsnap
->size
;
1433 arg
.xattr_version
= capsnap
->xattr_version
;
1434 arg
.xattr_buf
= capsnap
->xattr_blob
;
1436 arg
.atime
= capsnap
->atime
;
1437 arg
.mtime
= capsnap
->mtime
;
1438 arg
.ctime
= capsnap
->ctime
;
1440 arg
.op
= CEPH_CAP_OP_FLUSHSNAP
;
1441 arg
.caps
= capsnap
->issued
;
1443 arg
.dirty
= capsnap
->dirty
;
1448 arg
.time_warp_seq
= capsnap
->time_warp_seq
;
1450 arg
.uid
= capsnap
->uid
;
1451 arg
.gid
= capsnap
->gid
;
1452 arg
.mode
= capsnap
->mode
;
1454 arg
.inline_data
= capsnap
->inline_data
;
1457 return send_cap_msg(&arg
);
1461 * When a snapshot is taken, clients accumulate dirty metadata on
1462 * inodes with capabilities in ceph_cap_snaps to describe the file
1463 * state at the time the snapshot was taken. This must be flushed
1464 * asynchronously back to the MDS once sync writes complete and dirty
1465 * data is written out.
1467 * Called under i_ceph_lock. Takes s_mutex as needed.
1469 static void __ceph_flush_snaps(struct ceph_inode_info
*ci
,
1470 struct ceph_mds_session
*session
)
1471 __releases(ci
->i_ceph_lock
)
1472 __acquires(ci
->i_ceph_lock
)
1474 struct inode
*inode
= &ci
->vfs_inode
;
1475 struct ceph_mds_client
*mdsc
= session
->s_mdsc
;
1476 struct ceph_cap_snap
*capsnap
;
1477 u64 oldest_flush_tid
= 0;
1478 u64 first_tid
= 1, last_tid
= 0;
1480 dout("__flush_snaps %p session %p\n", inode
, session
);
1482 list_for_each_entry(capsnap
, &ci
->i_cap_snaps
, ci_item
) {
1484 * we need to wait for sync writes to complete and for dirty
1485 * pages to be written out.
1487 if (capsnap
->dirty_pages
|| capsnap
->writing
)
1490 /* should be removed by ceph_try_drop_cap_snap() */
1491 BUG_ON(!capsnap
->need_flush
);
1493 /* only flush each capsnap once */
1494 if (capsnap
->cap_flush
.tid
> 0) {
1495 dout(" already flushed %p, skipping\n", capsnap
);
1499 spin_lock(&mdsc
->cap_dirty_lock
);
1500 capsnap
->cap_flush
.tid
= ++mdsc
->last_cap_flush_tid
;
1501 list_add_tail(&capsnap
->cap_flush
.g_list
,
1502 &mdsc
->cap_flush_list
);
1503 if (oldest_flush_tid
== 0)
1504 oldest_flush_tid
= __get_oldest_flush_tid(mdsc
);
1505 if (list_empty(&ci
->i_flushing_item
)) {
1506 list_add_tail(&ci
->i_flushing_item
,
1507 &session
->s_cap_flushing
);
1509 spin_unlock(&mdsc
->cap_dirty_lock
);
1511 list_add_tail(&capsnap
->cap_flush
.i_list
,
1512 &ci
->i_cap_flush_list
);
1515 first_tid
= capsnap
->cap_flush
.tid
;
1516 last_tid
= capsnap
->cap_flush
.tid
;
1519 ci
->i_ceph_flags
&= ~CEPH_I_FLUSH_SNAPS
;
1521 while (first_tid
<= last_tid
) {
1522 struct ceph_cap
*cap
= ci
->i_auth_cap
;
1523 struct ceph_cap_flush
*cf
;
1526 if (!(cap
&& cap
->session
== session
)) {
1527 dout("__flush_snaps %p auth cap %p not mds%d, "
1528 "stop\n", inode
, cap
, session
->s_mds
);
1533 list_for_each_entry(cf
, &ci
->i_cap_flush_list
, i_list
) {
1534 if (cf
->tid
>= first_tid
) {
1542 first_tid
= cf
->tid
+ 1;
1544 capsnap
= container_of(cf
, struct ceph_cap_snap
, cap_flush
);
1545 refcount_inc(&capsnap
->nref
);
1546 spin_unlock(&ci
->i_ceph_lock
);
1548 dout("__flush_snaps %p capsnap %p tid %llu %s\n",
1549 inode
, capsnap
, cf
->tid
, ceph_cap_string(capsnap
->dirty
));
1551 ret
= __send_flush_snap(inode
, session
, capsnap
, cap
->mseq
,
1554 pr_err("__flush_snaps: error sending cap flushsnap, "
1555 "ino (%llx.%llx) tid %llu follows %llu\n",
1556 ceph_vinop(inode
), cf
->tid
, capsnap
->follows
);
1559 ceph_put_cap_snap(capsnap
);
1560 spin_lock(&ci
->i_ceph_lock
);
1564 void ceph_flush_snaps(struct ceph_inode_info
*ci
,
1565 struct ceph_mds_session
**psession
)
1567 struct inode
*inode
= &ci
->vfs_inode
;
1568 struct ceph_mds_client
*mdsc
= ceph_inode_to_client(inode
)->mdsc
;
1569 struct ceph_mds_session
*session
= NULL
;
1572 dout("ceph_flush_snaps %p\n", inode
);
1574 session
= *psession
;
1576 spin_lock(&ci
->i_ceph_lock
);
1577 if (!(ci
->i_ceph_flags
& CEPH_I_FLUSH_SNAPS
)) {
1578 dout(" no capsnap needs flush, doing nothing\n");
1581 if (!ci
->i_auth_cap
) {
1582 dout(" no auth cap (migrating?), doing nothing\n");
1586 mds
= ci
->i_auth_cap
->session
->s_mds
;
1587 if (session
&& session
->s_mds
!= mds
) {
1588 dout(" oops, wrong session %p mutex\n", session
);
1589 mutex_unlock(&session
->s_mutex
);
1590 ceph_put_mds_session(session
);
1594 spin_unlock(&ci
->i_ceph_lock
);
1595 mutex_lock(&mdsc
->mutex
);
1596 session
= __ceph_lookup_mds_session(mdsc
, mds
);
1597 mutex_unlock(&mdsc
->mutex
);
1599 dout(" inverting session/ino locks on %p\n", session
);
1600 mutex_lock(&session
->s_mutex
);
1605 // make sure flushsnap messages are sent in proper order.
1606 if (ci
->i_ceph_flags
& CEPH_I_KICK_FLUSH
) {
1607 __kick_flushing_caps(mdsc
, session
, ci
, 0);
1608 ci
->i_ceph_flags
&= ~CEPH_I_KICK_FLUSH
;
1611 __ceph_flush_snaps(ci
, session
);
1613 spin_unlock(&ci
->i_ceph_lock
);
1616 *psession
= session
;
1617 } else if (session
) {
1618 mutex_unlock(&session
->s_mutex
);
1619 ceph_put_mds_session(session
);
1621 /* we flushed them all; remove this inode from the queue */
1622 spin_lock(&mdsc
->snap_flush_lock
);
1623 list_del_init(&ci
->i_snap_flush_item
);
1624 spin_unlock(&mdsc
->snap_flush_lock
);
1628 * Mark caps dirty. If inode is newly dirty, return the dirty flags.
1629 * Caller is then responsible for calling __mark_inode_dirty with the
1630 * returned flags value.
1632 int __ceph_mark_dirty_caps(struct ceph_inode_info
*ci
, int mask
,
1633 struct ceph_cap_flush
**pcf
)
1635 struct ceph_mds_client
*mdsc
=
1636 ceph_sb_to_client(ci
->vfs_inode
.i_sb
)->mdsc
;
1637 struct inode
*inode
= &ci
->vfs_inode
;
1638 int was
= ci
->i_dirty_caps
;
1641 if (!ci
->i_auth_cap
) {
1642 pr_warn("__mark_dirty_caps %p %llx mask %s, "
1643 "but no auth cap (session was closed?)\n",
1644 inode
, ceph_ino(inode
), ceph_cap_string(mask
));
1648 dout("__mark_dirty_caps %p %s dirty %s -> %s\n", &ci
->vfs_inode
,
1649 ceph_cap_string(mask
), ceph_cap_string(was
),
1650 ceph_cap_string(was
| mask
));
1651 ci
->i_dirty_caps
|= mask
;
1653 WARN_ON_ONCE(ci
->i_prealloc_cap_flush
);
1654 swap(ci
->i_prealloc_cap_flush
, *pcf
);
1656 if (!ci
->i_head_snapc
) {
1657 WARN_ON_ONCE(!rwsem_is_locked(&mdsc
->snap_rwsem
));
1658 ci
->i_head_snapc
= ceph_get_snap_context(
1659 ci
->i_snap_realm
->cached_context
);
1661 dout(" inode %p now dirty snapc %p auth cap %p\n",
1662 &ci
->vfs_inode
, ci
->i_head_snapc
, ci
->i_auth_cap
);
1663 BUG_ON(!list_empty(&ci
->i_dirty_item
));
1664 spin_lock(&mdsc
->cap_dirty_lock
);
1665 list_add(&ci
->i_dirty_item
, &mdsc
->cap_dirty
);
1666 spin_unlock(&mdsc
->cap_dirty_lock
);
1667 if (ci
->i_flushing_caps
== 0) {
1669 dirty
|= I_DIRTY_SYNC
;
1672 WARN_ON_ONCE(!ci
->i_prealloc_cap_flush
);
1674 BUG_ON(list_empty(&ci
->i_dirty_item
));
1675 if (((was
| ci
->i_flushing_caps
) & CEPH_CAP_FILE_BUFFER
) &&
1676 (mask
& CEPH_CAP_FILE_BUFFER
))
1677 dirty
|= I_DIRTY_DATASYNC
;
1678 __cap_delay_requeue(mdsc
, ci
, true);
1682 struct ceph_cap_flush
*ceph_alloc_cap_flush(void)
1684 return kmem_cache_alloc(ceph_cap_flush_cachep
, GFP_KERNEL
);
1687 void ceph_free_cap_flush(struct ceph_cap_flush
*cf
)
1690 kmem_cache_free(ceph_cap_flush_cachep
, cf
);
1693 static u64
__get_oldest_flush_tid(struct ceph_mds_client
*mdsc
)
1695 if (!list_empty(&mdsc
->cap_flush_list
)) {
1696 struct ceph_cap_flush
*cf
=
1697 list_first_entry(&mdsc
->cap_flush_list
,
1698 struct ceph_cap_flush
, g_list
);
1705 * Remove cap_flush from the mdsc's or inode's flushing cap list.
1706 * Return true if caller needs to wake up flush waiters.
1708 static bool __finish_cap_flush(struct ceph_mds_client
*mdsc
,
1709 struct ceph_inode_info
*ci
,
1710 struct ceph_cap_flush
*cf
)
1712 struct ceph_cap_flush
*prev
;
1713 bool wake
= cf
->wake
;
1715 /* are there older pending cap flushes? */
1716 if (wake
&& cf
->g_list
.prev
!= &mdsc
->cap_flush_list
) {
1717 prev
= list_prev_entry(cf
, g_list
);
1721 list_del(&cf
->g_list
);
1723 if (wake
&& cf
->i_list
.prev
!= &ci
->i_cap_flush_list
) {
1724 prev
= list_prev_entry(cf
, i_list
);
1728 list_del(&cf
->i_list
);
1736 * Add dirty inode to the flushing list. Assigned a seq number so we
1737 * can wait for caps to flush without starving.
1739 * Called under i_ceph_lock.
1741 static int __mark_caps_flushing(struct inode
*inode
,
1742 struct ceph_mds_session
*session
, bool wake
,
1743 u64
*flush_tid
, u64
*oldest_flush_tid
)
1745 struct ceph_mds_client
*mdsc
= ceph_sb_to_client(inode
->i_sb
)->mdsc
;
1746 struct ceph_inode_info
*ci
= ceph_inode(inode
);
1747 struct ceph_cap_flush
*cf
= NULL
;
1750 BUG_ON(ci
->i_dirty_caps
== 0);
1751 BUG_ON(list_empty(&ci
->i_dirty_item
));
1752 BUG_ON(!ci
->i_prealloc_cap_flush
);
1754 flushing
= ci
->i_dirty_caps
;
1755 dout("__mark_caps_flushing flushing %s, flushing_caps %s -> %s\n",
1756 ceph_cap_string(flushing
),
1757 ceph_cap_string(ci
->i_flushing_caps
),
1758 ceph_cap_string(ci
->i_flushing_caps
| flushing
));
1759 ci
->i_flushing_caps
|= flushing
;
1760 ci
->i_dirty_caps
= 0;
1761 dout(" inode %p now !dirty\n", inode
);
1763 swap(cf
, ci
->i_prealloc_cap_flush
);
1764 cf
->caps
= flushing
;
1767 spin_lock(&mdsc
->cap_dirty_lock
);
1768 list_del_init(&ci
->i_dirty_item
);
1770 cf
->tid
= ++mdsc
->last_cap_flush_tid
;
1771 list_add_tail(&cf
->g_list
, &mdsc
->cap_flush_list
);
1772 *oldest_flush_tid
= __get_oldest_flush_tid(mdsc
);
1774 if (list_empty(&ci
->i_flushing_item
)) {
1775 list_add_tail(&ci
->i_flushing_item
, &session
->s_cap_flushing
);
1776 mdsc
->num_cap_flushing
++;
1778 spin_unlock(&mdsc
->cap_dirty_lock
);
1780 list_add_tail(&cf
->i_list
, &ci
->i_cap_flush_list
);
1782 *flush_tid
= cf
->tid
;
1787 * try to invalidate mapping pages without blocking.
1789 static int try_nonblocking_invalidate(struct inode
*inode
)
1791 struct ceph_inode_info
*ci
= ceph_inode(inode
);
1792 u32 invalidating_gen
= ci
->i_rdcache_gen
;
1794 spin_unlock(&ci
->i_ceph_lock
);
1795 invalidate_mapping_pages(&inode
->i_data
, 0, -1);
1796 spin_lock(&ci
->i_ceph_lock
);
1798 if (inode
->i_data
.nrpages
== 0 &&
1799 invalidating_gen
== ci
->i_rdcache_gen
) {
1801 dout("try_nonblocking_invalidate %p success\n", inode
);
1802 /* save any racing async invalidate some trouble */
1803 ci
->i_rdcache_revoking
= ci
->i_rdcache_gen
- 1;
1806 dout("try_nonblocking_invalidate %p failed\n", inode
);
1810 bool __ceph_should_report_size(struct ceph_inode_info
*ci
)
1812 loff_t size
= ci
->vfs_inode
.i_size
;
1813 /* mds will adjust max size according to the reported size */
1814 if (ci
->i_flushing_caps
& CEPH_CAP_FILE_WR
)
1816 if (size
>= ci
->i_max_size
)
1818 /* half of previous max_size increment has been used */
1819 if (ci
->i_max_size
> ci
->i_reported_size
&&
1820 (size
<< 1) >= ci
->i_max_size
+ ci
->i_reported_size
)
1826 * Swiss army knife function to examine currently used and wanted
1827 * versus held caps. Release, flush, ack revoked caps to mds as
1830 * CHECK_CAPS_NODELAY - caller is delayed work and we should not delay
1831 * cap release further.
1832 * CHECK_CAPS_AUTHONLY - we should only check the auth cap
1833 * CHECK_CAPS_FLUSH - we should flush any dirty caps immediately, without
1836 void ceph_check_caps(struct ceph_inode_info
*ci
, int flags
,
1837 struct ceph_mds_session
*session
)
1839 struct ceph_fs_client
*fsc
= ceph_inode_to_client(&ci
->vfs_inode
);
1840 struct ceph_mds_client
*mdsc
= fsc
->mdsc
;
1841 struct inode
*inode
= &ci
->vfs_inode
;
1842 struct ceph_cap
*cap
;
1843 u64 flush_tid
, oldest_flush_tid
;
1844 int file_wanted
, used
, cap_used
;
1845 int took_snap_rwsem
= 0; /* true if mdsc->snap_rwsem held */
1846 int issued
, implemented
, want
, retain
, revoking
, flushing
= 0;
1847 int mds
= -1; /* keep track of how far we've gone through i_caps list
1848 to avoid an infinite loop on retry */
1850 int delayed
= 0, sent
= 0;
1851 bool no_delay
= flags
& CHECK_CAPS_NODELAY
;
1852 bool queue_invalidate
= false;
1853 bool tried_invalidate
= false;
1855 /* if we are unmounting, flush any unused caps immediately. */
1859 spin_lock(&ci
->i_ceph_lock
);
1861 if (ci
->i_ceph_flags
& CEPH_I_FLUSH
)
1862 flags
|= CHECK_CAPS_FLUSH
;
1864 if (!(flags
& CHECK_CAPS_AUTHONLY
) ||
1865 (ci
->i_auth_cap
&& __ceph_is_single_caps(ci
)))
1866 __cap_delay_cancel(mdsc
, ci
);
1870 spin_lock(&ci
->i_ceph_lock
);
1872 file_wanted
= __ceph_caps_file_wanted(ci
);
1873 used
= __ceph_caps_used(ci
);
1874 issued
= __ceph_caps_issued(ci
, &implemented
);
1875 revoking
= implemented
& ~issued
;
1878 retain
= file_wanted
| used
| CEPH_CAP_PIN
;
1879 if (!mdsc
->stopping
&& inode
->i_nlink
> 0) {
1881 retain
|= CEPH_CAP_ANY
; /* be greedy */
1882 } else if (S_ISDIR(inode
->i_mode
) &&
1883 (issued
& CEPH_CAP_FILE_SHARED
) &&
1884 __ceph_dir_is_complete(ci
)) {
1886 * If a directory is complete, we want to keep
1887 * the exclusive cap. So that MDS does not end up
1888 * revoking the shared cap on every create/unlink
1891 if (IS_RDONLY(inode
))
1892 want
= CEPH_CAP_ANY_SHARED
;
1894 want
= CEPH_CAP_ANY_SHARED
| CEPH_CAP_FILE_EXCL
;
1898 retain
|= CEPH_CAP_ANY_SHARED
;
1900 * keep RD only if we didn't have the file open RW,
1901 * because then the mds would revoke it anyway to
1902 * journal max_size=0.
1904 if (ci
->i_max_size
== 0)
1905 retain
|= CEPH_CAP_ANY_RD
;
1909 dout("check_caps %p file_want %s used %s dirty %s flushing %s"
1910 " issued %s revoking %s retain %s %s%s%s\n", inode
,
1911 ceph_cap_string(file_wanted
),
1912 ceph_cap_string(used
), ceph_cap_string(ci
->i_dirty_caps
),
1913 ceph_cap_string(ci
->i_flushing_caps
),
1914 ceph_cap_string(issued
), ceph_cap_string(revoking
),
1915 ceph_cap_string(retain
),
1916 (flags
& CHECK_CAPS_AUTHONLY
) ? " AUTHONLY" : "",
1917 (flags
& CHECK_CAPS_NODELAY
) ? " NODELAY" : "",
1918 (flags
& CHECK_CAPS_FLUSH
) ? " FLUSH" : "");
1921 * If we no longer need to hold onto old our caps, and we may
1922 * have cached pages, but don't want them, then try to invalidate.
1923 * If we fail, it's because pages are locked.... try again later.
1925 if ((!no_delay
|| mdsc
->stopping
) &&
1926 !S_ISDIR(inode
->i_mode
) && /* ignore readdir cache */
1927 !(ci
->i_wb_ref
|| ci
->i_wrbuffer_ref
) && /* no dirty pages... */
1928 inode
->i_data
.nrpages
&& /* have cached pages */
1929 (revoking
& (CEPH_CAP_FILE_CACHE
|
1930 CEPH_CAP_FILE_LAZYIO
)) && /* or revoking cache */
1931 !tried_invalidate
) {
1932 dout("check_caps trying to invalidate on %p\n", inode
);
1933 if (try_nonblocking_invalidate(inode
) < 0) {
1934 dout("check_caps queuing invalidate\n");
1935 queue_invalidate
= true;
1936 ci
->i_rdcache_revoking
= ci
->i_rdcache_gen
;
1938 tried_invalidate
= true;
1942 for (p
= rb_first(&ci
->i_caps
); p
; p
= rb_next(p
)) {
1943 cap
= rb_entry(p
, struct ceph_cap
, ci_node
);
1945 /* avoid looping forever */
1946 if (mds
>= cap
->mds
||
1947 ((flags
& CHECK_CAPS_AUTHONLY
) && cap
!= ci
->i_auth_cap
))
1950 /* NOTE: no side-effects allowed, until we take s_mutex */
1953 if (ci
->i_auth_cap
&& cap
!= ci
->i_auth_cap
)
1954 cap_used
&= ~ci
->i_auth_cap
->issued
;
1956 revoking
= cap
->implemented
& ~cap
->issued
;
1957 dout(" mds%d cap %p used %s issued %s implemented %s revoking %s\n",
1958 cap
->mds
, cap
, ceph_cap_string(cap_used
),
1959 ceph_cap_string(cap
->issued
),
1960 ceph_cap_string(cap
->implemented
),
1961 ceph_cap_string(revoking
));
1963 if (cap
== ci
->i_auth_cap
&&
1964 (cap
->issued
& CEPH_CAP_FILE_WR
)) {
1965 /* request larger max_size from MDS? */
1966 if (ci
->i_wanted_max_size
> ci
->i_max_size
&&
1967 ci
->i_wanted_max_size
> ci
->i_requested_max_size
) {
1968 dout("requesting new max_size\n");
1972 /* approaching file_max? */
1973 if (__ceph_should_report_size(ci
)) {
1974 dout("i_size approaching max_size\n");
1978 /* flush anything dirty? */
1979 if (cap
== ci
->i_auth_cap
) {
1980 if ((flags
& CHECK_CAPS_FLUSH
) && ci
->i_dirty_caps
) {
1981 dout("flushing dirty caps\n");
1984 if (ci
->i_ceph_flags
& CEPH_I_FLUSH_SNAPS
) {
1985 dout("flushing snap caps\n");
1990 /* completed revocation? going down and there are no caps? */
1991 if (revoking
&& (revoking
& cap_used
) == 0) {
1992 dout("completed revocation of %s\n",
1993 ceph_cap_string(cap
->implemented
& ~cap
->issued
));
1997 /* want more caps from mds? */
1998 if (want
& ~(cap
->mds_wanted
| cap
->issued
))
2001 /* things we might delay */
2002 if ((cap
->issued
& ~retain
) == 0)
2003 continue; /* nope, all good */
2009 if ((ci
->i_ceph_flags
& CEPH_I_NODELAY
) == 0 &&
2010 time_before(jiffies
, ci
->i_hold_caps_max
)) {
2011 dout(" delaying issued %s -> %s, wanted %s -> %s\n",
2012 ceph_cap_string(cap
->issued
),
2013 ceph_cap_string(cap
->issued
& retain
),
2014 ceph_cap_string(cap
->mds_wanted
),
2015 ceph_cap_string(want
));
2021 if (ci
->i_ceph_flags
& CEPH_I_NOFLUSH
) {
2022 dout(" skipping %p I_NOFLUSH set\n", inode
);
2026 if (session
&& session
!= cap
->session
) {
2027 dout("oops, wrong session %p mutex\n", session
);
2028 mutex_unlock(&session
->s_mutex
);
2032 session
= cap
->session
;
2033 if (mutex_trylock(&session
->s_mutex
) == 0) {
2034 dout("inverting session/ino locks on %p\n",
2036 spin_unlock(&ci
->i_ceph_lock
);
2037 if (took_snap_rwsem
) {
2038 up_read(&mdsc
->snap_rwsem
);
2039 took_snap_rwsem
= 0;
2041 mutex_lock(&session
->s_mutex
);
2046 /* kick flushing and flush snaps before sending normal
2048 if (cap
== ci
->i_auth_cap
&&
2050 (CEPH_I_KICK_FLUSH
| CEPH_I_FLUSH_SNAPS
))) {
2051 if (ci
->i_ceph_flags
& CEPH_I_KICK_FLUSH
) {
2052 __kick_flushing_caps(mdsc
, session
, ci
, 0);
2053 ci
->i_ceph_flags
&= ~CEPH_I_KICK_FLUSH
;
2055 if (ci
->i_ceph_flags
& CEPH_I_FLUSH_SNAPS
)
2056 __ceph_flush_snaps(ci
, session
);
2061 /* take snap_rwsem after session mutex */
2062 if (!took_snap_rwsem
) {
2063 if (down_read_trylock(&mdsc
->snap_rwsem
) == 0) {
2064 dout("inverting snap/in locks on %p\n",
2066 spin_unlock(&ci
->i_ceph_lock
);
2067 down_read(&mdsc
->snap_rwsem
);
2068 took_snap_rwsem
= 1;
2071 took_snap_rwsem
= 1;
2074 if (cap
== ci
->i_auth_cap
&& ci
->i_dirty_caps
) {
2075 flushing
= __mark_caps_flushing(inode
, session
, false,
2081 spin_lock(&mdsc
->cap_dirty_lock
);
2082 oldest_flush_tid
= __get_oldest_flush_tid(mdsc
);
2083 spin_unlock(&mdsc
->cap_dirty_lock
);
2086 mds
= cap
->mds
; /* remember mds, so we don't repeat */
2089 /* __send_cap drops i_ceph_lock */
2090 delayed
+= __send_cap(mdsc
, cap
, CEPH_CAP_OP_UPDATE
, false,
2091 cap_used
, want
, retain
, flushing
,
2092 flush_tid
, oldest_flush_tid
);
2093 goto retry
; /* retake i_ceph_lock and restart our cap scan. */
2096 /* Reschedule delayed caps release if we delayed anything */
2098 __cap_delay_requeue(mdsc
, ci
, false);
2100 spin_unlock(&ci
->i_ceph_lock
);
2102 if (queue_invalidate
)
2103 ceph_queue_invalidate(inode
);
2106 mutex_unlock(&session
->s_mutex
);
2107 if (took_snap_rwsem
)
2108 up_read(&mdsc
->snap_rwsem
);
2112 * Try to flush dirty caps back to the auth mds.
2114 static int try_flush_caps(struct inode
*inode
, u64
*ptid
)
2116 struct ceph_mds_client
*mdsc
= ceph_sb_to_client(inode
->i_sb
)->mdsc
;
2117 struct ceph_inode_info
*ci
= ceph_inode(inode
);
2118 struct ceph_mds_session
*session
= NULL
;
2120 u64 flush_tid
= 0, oldest_flush_tid
= 0;
2123 spin_lock(&ci
->i_ceph_lock
);
2124 if (ci
->i_ceph_flags
& CEPH_I_NOFLUSH
) {
2125 spin_unlock(&ci
->i_ceph_lock
);
2126 dout("try_flush_caps skipping %p I_NOFLUSH set\n", inode
);
2129 if (ci
->i_dirty_caps
&& ci
->i_auth_cap
) {
2130 struct ceph_cap
*cap
= ci
->i_auth_cap
;
2131 int used
= __ceph_caps_used(ci
);
2132 int want
= __ceph_caps_wanted(ci
);
2135 if (!session
|| session
!= cap
->session
) {
2136 spin_unlock(&ci
->i_ceph_lock
);
2138 mutex_unlock(&session
->s_mutex
);
2139 session
= cap
->session
;
2140 mutex_lock(&session
->s_mutex
);
2143 if (cap
->session
->s_state
< CEPH_MDS_SESSION_OPEN
) {
2144 spin_unlock(&ci
->i_ceph_lock
);
2148 flushing
= __mark_caps_flushing(inode
, session
, true,
2149 &flush_tid
, &oldest_flush_tid
);
2151 /* __send_cap drops i_ceph_lock */
2152 delayed
= __send_cap(mdsc
, cap
, CEPH_CAP_OP_FLUSH
, true,
2153 used
, want
, (cap
->issued
| cap
->implemented
),
2154 flushing
, flush_tid
, oldest_flush_tid
);
2157 spin_lock(&ci
->i_ceph_lock
);
2158 __cap_delay_requeue(mdsc
, ci
, true);
2159 spin_unlock(&ci
->i_ceph_lock
);
2162 if (!list_empty(&ci
->i_cap_flush_list
)) {
2163 struct ceph_cap_flush
*cf
=
2164 list_last_entry(&ci
->i_cap_flush_list
,
2165 struct ceph_cap_flush
, i_list
);
2167 flush_tid
= cf
->tid
;
2169 flushing
= ci
->i_flushing_caps
;
2170 spin_unlock(&ci
->i_ceph_lock
);
2174 mutex_unlock(&session
->s_mutex
);
2181 * Return true if we've flushed caps through the given flush_tid.
2183 static int caps_are_flushed(struct inode
*inode
, u64 flush_tid
)
2185 struct ceph_inode_info
*ci
= ceph_inode(inode
);
2188 spin_lock(&ci
->i_ceph_lock
);
2189 if (!list_empty(&ci
->i_cap_flush_list
)) {
2190 struct ceph_cap_flush
* cf
=
2191 list_first_entry(&ci
->i_cap_flush_list
,
2192 struct ceph_cap_flush
, i_list
);
2193 if (cf
->tid
<= flush_tid
)
2196 spin_unlock(&ci
->i_ceph_lock
);
2201 * wait for any unsafe requests to complete.
2203 static int unsafe_request_wait(struct inode
*inode
)
2205 struct ceph_inode_info
*ci
= ceph_inode(inode
);
2206 struct ceph_mds_request
*req1
= NULL
, *req2
= NULL
;
2209 spin_lock(&ci
->i_unsafe_lock
);
2210 if (S_ISDIR(inode
->i_mode
) && !list_empty(&ci
->i_unsafe_dirops
)) {
2211 req1
= list_last_entry(&ci
->i_unsafe_dirops
,
2212 struct ceph_mds_request
,
2214 ceph_mdsc_get_request(req1
);
2216 if (!list_empty(&ci
->i_unsafe_iops
)) {
2217 req2
= list_last_entry(&ci
->i_unsafe_iops
,
2218 struct ceph_mds_request
,
2219 r_unsafe_target_item
);
2220 ceph_mdsc_get_request(req2
);
2222 spin_unlock(&ci
->i_unsafe_lock
);
2224 dout("unsafe_request_wait %p wait on tid %llu %llu\n",
2225 inode
, req1
? req1
->r_tid
: 0ULL, req2
? req2
->r_tid
: 0ULL);
2227 ret
= !wait_for_completion_timeout(&req1
->r_safe_completion
,
2228 ceph_timeout_jiffies(req1
->r_timeout
));
2231 ceph_mdsc_put_request(req1
);
2234 ret
= !wait_for_completion_timeout(&req2
->r_safe_completion
,
2235 ceph_timeout_jiffies(req2
->r_timeout
));
2238 ceph_mdsc_put_request(req2
);
2243 int ceph_fsync(struct file
*file
, loff_t start
, loff_t end
, int datasync
)
2245 struct inode
*inode
= file
->f_mapping
->host
;
2246 struct ceph_inode_info
*ci
= ceph_inode(inode
);
2251 dout("fsync %p%s\n", inode
, datasync
? " datasync" : "");
2253 ret
= file_write_and_wait_range(file
, start
, end
);
2260 dirty
= try_flush_caps(inode
, &flush_tid
);
2261 dout("fsync dirty caps are %s\n", ceph_cap_string(dirty
));
2263 ret
= unsafe_request_wait(inode
);
2266 * only wait on non-file metadata writeback (the mds
2267 * can recover size and mtime, so we don't need to
2270 if (!ret
&& (dirty
& ~CEPH_CAP_ANY_FILE_WR
)) {
2271 ret
= wait_event_interruptible(ci
->i_cap_wq
,
2272 caps_are_flushed(inode
, flush_tid
));
2275 dout("fsync %p%s result=%d\n", inode
, datasync
? " datasync" : "", ret
);
2280 * Flush any dirty caps back to the mds. If we aren't asked to wait,
2281 * queue inode for flush but don't do so immediately, because we can
2282 * get by with fewer MDS messages if we wait for data writeback to
2285 int ceph_write_inode(struct inode
*inode
, struct writeback_control
*wbc
)
2287 struct ceph_inode_info
*ci
= ceph_inode(inode
);
2291 int wait
= (wbc
->sync_mode
== WB_SYNC_ALL
&& !wbc
->for_sync
);
2293 dout("write_inode %p wait=%d\n", inode
, wait
);
2295 dirty
= try_flush_caps(inode
, &flush_tid
);
2297 err
= wait_event_interruptible(ci
->i_cap_wq
,
2298 caps_are_flushed(inode
, flush_tid
));
2300 struct ceph_mds_client
*mdsc
=
2301 ceph_sb_to_client(inode
->i_sb
)->mdsc
;
2303 spin_lock(&ci
->i_ceph_lock
);
2304 if (__ceph_caps_dirty(ci
))
2305 __cap_delay_requeue_front(mdsc
, ci
);
2306 spin_unlock(&ci
->i_ceph_lock
);
2311 static void __kick_flushing_caps(struct ceph_mds_client
*mdsc
,
2312 struct ceph_mds_session
*session
,
2313 struct ceph_inode_info
*ci
,
2314 u64 oldest_flush_tid
)
2315 __releases(ci
->i_ceph_lock
)
2316 __acquires(ci
->i_ceph_lock
)
2318 struct inode
*inode
= &ci
->vfs_inode
;
2319 struct ceph_cap
*cap
;
2320 struct ceph_cap_flush
*cf
;
2324 list_for_each_entry(cf
, &ci
->i_cap_flush_list
, i_list
) {
2325 if (cf
->tid
< first_tid
)
2328 cap
= ci
->i_auth_cap
;
2329 if (!(cap
&& cap
->session
== session
)) {
2330 pr_err("%p auth cap %p not mds%d ???\n",
2331 inode
, cap
, session
->s_mds
);
2335 first_tid
= cf
->tid
+ 1;
2338 dout("kick_flushing_caps %p cap %p tid %llu %s\n",
2339 inode
, cap
, cf
->tid
, ceph_cap_string(cf
->caps
));
2340 ci
->i_ceph_flags
|= CEPH_I_NODELAY
;
2341 ret
= __send_cap(mdsc
, cap
, CEPH_CAP_OP_FLUSH
,
2342 false, __ceph_caps_used(ci
),
2343 __ceph_caps_wanted(ci
),
2344 cap
->issued
| cap
->implemented
,
2345 cf
->caps
, cf
->tid
, oldest_flush_tid
);
2347 pr_err("kick_flushing_caps: error sending "
2348 "cap flush, ino (%llx.%llx) "
2349 "tid %llu flushing %s\n",
2350 ceph_vinop(inode
), cf
->tid
,
2351 ceph_cap_string(cf
->caps
));
2354 struct ceph_cap_snap
*capsnap
=
2355 container_of(cf
, struct ceph_cap_snap
,
2357 dout("kick_flushing_caps %p capsnap %p tid %llu %s\n",
2358 inode
, capsnap
, cf
->tid
,
2359 ceph_cap_string(capsnap
->dirty
));
2361 refcount_inc(&capsnap
->nref
);
2362 spin_unlock(&ci
->i_ceph_lock
);
2364 ret
= __send_flush_snap(inode
, session
, capsnap
, cap
->mseq
,
2367 pr_err("kick_flushing_caps: error sending "
2368 "cap flushsnap, ino (%llx.%llx) "
2369 "tid %llu follows %llu\n",
2370 ceph_vinop(inode
), cf
->tid
,
2374 ceph_put_cap_snap(capsnap
);
2377 spin_lock(&ci
->i_ceph_lock
);
2381 void ceph_early_kick_flushing_caps(struct ceph_mds_client
*mdsc
,
2382 struct ceph_mds_session
*session
)
2384 struct ceph_inode_info
*ci
;
2385 struct ceph_cap
*cap
;
2386 u64 oldest_flush_tid
;
2388 dout("early_kick_flushing_caps mds%d\n", session
->s_mds
);
2390 spin_lock(&mdsc
->cap_dirty_lock
);
2391 oldest_flush_tid
= __get_oldest_flush_tid(mdsc
);
2392 spin_unlock(&mdsc
->cap_dirty_lock
);
2394 list_for_each_entry(ci
, &session
->s_cap_flushing
, i_flushing_item
) {
2395 spin_lock(&ci
->i_ceph_lock
);
2396 cap
= ci
->i_auth_cap
;
2397 if (!(cap
&& cap
->session
== session
)) {
2398 pr_err("%p auth cap %p not mds%d ???\n",
2399 &ci
->vfs_inode
, cap
, session
->s_mds
);
2400 spin_unlock(&ci
->i_ceph_lock
);
2406 * if flushing caps were revoked, we re-send the cap flush
2407 * in client reconnect stage. This guarantees MDS * processes
2408 * the cap flush message before issuing the flushing caps to
2411 if ((cap
->issued
& ci
->i_flushing_caps
) !=
2412 ci
->i_flushing_caps
) {
2413 ci
->i_ceph_flags
&= ~CEPH_I_KICK_FLUSH
;
2414 /* encode_caps_cb() also will reset these sequence
2415 * numbers. make sure sequence numbers in cap flush
2416 * message match later reconnect message */
2420 __kick_flushing_caps(mdsc
, session
, ci
,
2423 ci
->i_ceph_flags
|= CEPH_I_KICK_FLUSH
;
2426 spin_unlock(&ci
->i_ceph_lock
);
2430 void ceph_kick_flushing_caps(struct ceph_mds_client
*mdsc
,
2431 struct ceph_mds_session
*session
)
2433 struct ceph_inode_info
*ci
;
2434 struct ceph_cap
*cap
;
2435 u64 oldest_flush_tid
;
2437 dout("kick_flushing_caps mds%d\n", session
->s_mds
);
2439 spin_lock(&mdsc
->cap_dirty_lock
);
2440 oldest_flush_tid
= __get_oldest_flush_tid(mdsc
);
2441 spin_unlock(&mdsc
->cap_dirty_lock
);
2443 list_for_each_entry(ci
, &session
->s_cap_flushing
, i_flushing_item
) {
2444 spin_lock(&ci
->i_ceph_lock
);
2445 cap
= ci
->i_auth_cap
;
2446 if (!(cap
&& cap
->session
== session
)) {
2447 pr_err("%p auth cap %p not mds%d ???\n",
2448 &ci
->vfs_inode
, cap
, session
->s_mds
);
2449 spin_unlock(&ci
->i_ceph_lock
);
2452 if (ci
->i_ceph_flags
& CEPH_I_KICK_FLUSH
) {
2453 ci
->i_ceph_flags
&= ~CEPH_I_KICK_FLUSH
;
2454 __kick_flushing_caps(mdsc
, session
, ci
,
2457 spin_unlock(&ci
->i_ceph_lock
);
2461 static void kick_flushing_inode_caps(struct ceph_mds_client
*mdsc
,
2462 struct ceph_mds_session
*session
,
2463 struct inode
*inode
)
2464 __releases(ci
->i_ceph_lock
)
2466 struct ceph_inode_info
*ci
= ceph_inode(inode
);
2467 struct ceph_cap
*cap
;
2469 cap
= ci
->i_auth_cap
;
2470 dout("kick_flushing_inode_caps %p flushing %s\n", inode
,
2471 ceph_cap_string(ci
->i_flushing_caps
));
2473 if (!list_empty(&ci
->i_cap_flush_list
)) {
2474 u64 oldest_flush_tid
;
2475 spin_lock(&mdsc
->cap_dirty_lock
);
2476 list_move_tail(&ci
->i_flushing_item
,
2477 &cap
->session
->s_cap_flushing
);
2478 oldest_flush_tid
= __get_oldest_flush_tid(mdsc
);
2479 spin_unlock(&mdsc
->cap_dirty_lock
);
2481 ci
->i_ceph_flags
&= ~CEPH_I_KICK_FLUSH
;
2482 __kick_flushing_caps(mdsc
, session
, ci
, oldest_flush_tid
);
2483 spin_unlock(&ci
->i_ceph_lock
);
2485 spin_unlock(&ci
->i_ceph_lock
);
2491 * Take references to capabilities we hold, so that we don't release
2492 * them to the MDS prematurely.
2494 * Protected by i_ceph_lock.
2496 static void __take_cap_refs(struct ceph_inode_info
*ci
, int got
,
2497 bool snap_rwsem_locked
)
2499 if (got
& CEPH_CAP_PIN
)
2501 if (got
& CEPH_CAP_FILE_RD
)
2503 if (got
& CEPH_CAP_FILE_CACHE
)
2504 ci
->i_rdcache_ref
++;
2505 if (got
& CEPH_CAP_FILE_WR
) {
2506 if (ci
->i_wr_ref
== 0 && !ci
->i_head_snapc
) {
2507 BUG_ON(!snap_rwsem_locked
);
2508 ci
->i_head_snapc
= ceph_get_snap_context(
2509 ci
->i_snap_realm
->cached_context
);
2513 if (got
& CEPH_CAP_FILE_BUFFER
) {
2514 if (ci
->i_wb_ref
== 0)
2515 ihold(&ci
->vfs_inode
);
2517 dout("__take_cap_refs %p wb %d -> %d (?)\n",
2518 &ci
->vfs_inode
, ci
->i_wb_ref
-1, ci
->i_wb_ref
);
2523 * Try to grab cap references. Specify those refs we @want, and the
2524 * minimal set we @need. Also include the larger offset we are writing
2525 * to (when applicable), and check against max_size here as well.
2526 * Note that caller is responsible for ensuring max_size increases are
2527 * requested from the MDS.
2529 * Returns 0 if caps were not able to be acquired (yet), a 1 if they were,
2530 * or a negative error code.
2532 * FIXME: how does a 0 return differ from -EAGAIN?
2534 static int try_get_cap_refs(struct ceph_inode_info
*ci
, int need
, int want
,
2535 loff_t endoff
, bool nonblock
, int *got
)
2537 struct inode
*inode
= &ci
->vfs_inode
;
2538 struct ceph_mds_client
*mdsc
= ceph_inode_to_client(inode
)->mdsc
;
2540 int have
, implemented
;
2542 bool snap_rwsem_locked
= false;
2544 dout("get_cap_refs %p need %s want %s\n", inode
,
2545 ceph_cap_string(need
), ceph_cap_string(want
));
2548 spin_lock(&ci
->i_ceph_lock
);
2550 /* make sure file is actually open */
2551 file_wanted
= __ceph_caps_file_wanted(ci
);
2552 if ((file_wanted
& need
) != need
) {
2553 dout("try_get_cap_refs need %s file_wanted %s, EBADF\n",
2554 ceph_cap_string(need
), ceph_cap_string(file_wanted
));
2559 /* finish pending truncate */
2560 while (ci
->i_truncate_pending
) {
2561 spin_unlock(&ci
->i_ceph_lock
);
2562 if (snap_rwsem_locked
) {
2563 up_read(&mdsc
->snap_rwsem
);
2564 snap_rwsem_locked
= false;
2566 __ceph_do_pending_vmtruncate(inode
);
2567 spin_lock(&ci
->i_ceph_lock
);
2570 have
= __ceph_caps_issued(ci
, &implemented
);
2572 if (have
& need
& CEPH_CAP_FILE_WR
) {
2573 if (endoff
>= 0 && endoff
> (loff_t
)ci
->i_max_size
) {
2574 dout("get_cap_refs %p endoff %llu > maxsize %llu\n",
2575 inode
, endoff
, ci
->i_max_size
);
2576 if (endoff
> ci
->i_requested_max_size
)
2581 * If a sync write is in progress, we must wait, so that we
2582 * can get a final snapshot value for size+mtime.
2584 if (__ceph_have_pending_cap_snap(ci
)) {
2585 dout("get_cap_refs %p cap_snap_pending\n", inode
);
2590 if ((have
& need
) == need
) {
2592 * Look at (implemented & ~have & not) so that we keep waiting
2593 * on transition from wanted -> needed caps. This is needed
2594 * for WRBUFFER|WR -> WR to avoid a new WR sync write from
2595 * going before a prior buffered writeback happens.
2597 int not = want
& ~(have
& need
);
2598 int revoking
= implemented
& ~have
;
2599 dout("get_cap_refs %p have %s but not %s (revoking %s)\n",
2600 inode
, ceph_cap_string(have
), ceph_cap_string(not),
2601 ceph_cap_string(revoking
));
2602 if ((revoking
& not) == 0) {
2603 if (!snap_rwsem_locked
&&
2604 !ci
->i_head_snapc
&&
2605 (need
& CEPH_CAP_FILE_WR
)) {
2606 if (!down_read_trylock(&mdsc
->snap_rwsem
)) {
2608 * we can not call down_read() when
2609 * task isn't in TASK_RUNNING state
2616 spin_unlock(&ci
->i_ceph_lock
);
2617 down_read(&mdsc
->snap_rwsem
);
2618 snap_rwsem_locked
= true;
2621 snap_rwsem_locked
= true;
2623 *got
= need
| (have
& want
);
2624 if ((need
& CEPH_CAP_FILE_RD
) &&
2625 !(*got
& CEPH_CAP_FILE_CACHE
))
2626 ceph_disable_fscache_readpage(ci
);
2627 __take_cap_refs(ci
, *got
, true);
2631 int session_readonly
= false;
2632 if ((need
& CEPH_CAP_FILE_WR
) && ci
->i_auth_cap
) {
2633 struct ceph_mds_session
*s
= ci
->i_auth_cap
->session
;
2634 spin_lock(&s
->s_cap_lock
);
2635 session_readonly
= s
->s_readonly
;
2636 spin_unlock(&s
->s_cap_lock
);
2638 if (session_readonly
) {
2639 dout("get_cap_refs %p needed %s but mds%d readonly\n",
2640 inode
, ceph_cap_string(need
), ci
->i_auth_cap
->mds
);
2645 if (ci
->i_ceph_flags
& CEPH_I_CAP_DROPPED
) {
2647 if (READ_ONCE(mdsc
->fsc
->mount_state
) ==
2648 CEPH_MOUNT_SHUTDOWN
) {
2649 dout("get_cap_refs %p forced umount\n", inode
);
2653 mds_wanted
= __ceph_caps_mds_wanted(ci
, false);
2654 if (need
& ~(mds_wanted
& need
)) {
2655 dout("get_cap_refs %p caps were dropped"
2656 " (session killed?)\n", inode
);
2660 if (!(file_wanted
& ~mds_wanted
))
2661 ci
->i_ceph_flags
&= ~CEPH_I_CAP_DROPPED
;
2664 dout("get_cap_refs %p have %s needed %s\n", inode
,
2665 ceph_cap_string(have
), ceph_cap_string(need
));
2668 spin_unlock(&ci
->i_ceph_lock
);
2669 if (snap_rwsem_locked
)
2670 up_read(&mdsc
->snap_rwsem
);
2672 dout("get_cap_refs %p ret %d got %s\n", inode
,
2673 ret
, ceph_cap_string(*got
));
2678 * Check the offset we are writing up to against our current
2679 * max_size. If necessary, tell the MDS we want to write to
2682 static void check_max_size(struct inode
*inode
, loff_t endoff
)
2684 struct ceph_inode_info
*ci
= ceph_inode(inode
);
2687 /* do we need to explicitly request a larger max_size? */
2688 spin_lock(&ci
->i_ceph_lock
);
2689 if (endoff
>= ci
->i_max_size
&& endoff
> ci
->i_wanted_max_size
) {
2690 dout("write %p at large endoff %llu, req max_size\n",
2692 ci
->i_wanted_max_size
= endoff
;
2694 /* duplicate ceph_check_caps()'s logic */
2695 if (ci
->i_auth_cap
&&
2696 (ci
->i_auth_cap
->issued
& CEPH_CAP_FILE_WR
) &&
2697 ci
->i_wanted_max_size
> ci
->i_max_size
&&
2698 ci
->i_wanted_max_size
> ci
->i_requested_max_size
)
2700 spin_unlock(&ci
->i_ceph_lock
);
2702 ceph_check_caps(ci
, CHECK_CAPS_AUTHONLY
, NULL
);
2705 int ceph_try_get_caps(struct ceph_inode_info
*ci
, int need
, int want
,
2706 bool nonblock
, int *got
)
2710 BUG_ON(need
& ~CEPH_CAP_FILE_RD
);
2711 BUG_ON(want
& ~(CEPH_CAP_FILE_CACHE
|CEPH_CAP_FILE_LAZYIO
|CEPH_CAP_FILE_SHARED
));
2712 ret
= ceph_pool_perm_check(ci
, need
);
2716 ret
= try_get_cap_refs(ci
, need
, want
, 0, nonblock
, got
);
2717 return ret
== -EAGAIN
? 0 : ret
;
2721 * Wait for caps, and take cap references. If we can't get a WR cap
2722 * due to a small max_size, make sure we check_max_size (and possibly
2723 * ask the mds) so we don't get hung up indefinitely.
2725 int ceph_get_caps(struct ceph_inode_info
*ci
, int need
, int want
,
2726 loff_t endoff
, int *got
, struct page
**pinned_page
)
2730 ret
= ceph_pool_perm_check(ci
, need
);
2736 check_max_size(&ci
->vfs_inode
, endoff
);
2739 ret
= try_get_cap_refs(ci
, need
, want
, endoff
,
2744 DEFINE_WAIT_FUNC(wait
, woken_wake_function
);
2745 add_wait_queue(&ci
->i_cap_wq
, &wait
);
2747 while (!(ret
= try_get_cap_refs(ci
, need
, want
, endoff
,
2749 if (signal_pending(current
)) {
2753 wait_woken(&wait
, TASK_INTERRUPTIBLE
, MAX_SCHEDULE_TIMEOUT
);
2756 remove_wait_queue(&ci
->i_cap_wq
, &wait
);
2761 if (ret
== -ESTALE
) {
2762 /* session was killed, try renew caps */
2763 ret
= ceph_renew_caps(&ci
->vfs_inode
);
2770 if (ci
->i_inline_version
!= CEPH_INLINE_NONE
&&
2771 (_got
& (CEPH_CAP_FILE_CACHE
|CEPH_CAP_FILE_LAZYIO
)) &&
2772 i_size_read(&ci
->vfs_inode
) > 0) {
2774 find_get_page(ci
->vfs_inode
.i_mapping
, 0);
2776 if (PageUptodate(page
)) {
2777 *pinned_page
= page
;
2783 * drop cap refs first because getattr while
2784 * holding * caps refs can cause deadlock.
2786 ceph_put_cap_refs(ci
, _got
);
2790 * getattr request will bring inline data into
2793 ret
= __ceph_do_getattr(&ci
->vfs_inode
, NULL
,
2794 CEPH_STAT_CAP_INLINE_DATA
,
2803 if ((_got
& CEPH_CAP_FILE_RD
) && (_got
& CEPH_CAP_FILE_CACHE
))
2804 ceph_fscache_revalidate_cookie(ci
);
2811 * Take cap refs. Caller must already know we hold at least one ref
2812 * on the caps in question or we don't know this is safe.
2814 void ceph_get_cap_refs(struct ceph_inode_info
*ci
, int caps
)
2816 spin_lock(&ci
->i_ceph_lock
);
2817 __take_cap_refs(ci
, caps
, false);
2818 spin_unlock(&ci
->i_ceph_lock
);
2823 * drop cap_snap that is not associated with any snapshot.
2824 * we don't need to send FLUSHSNAP message for it.
2826 static int ceph_try_drop_cap_snap(struct ceph_inode_info
*ci
,
2827 struct ceph_cap_snap
*capsnap
)
2829 if (!capsnap
->need_flush
&&
2830 !capsnap
->writing
&& !capsnap
->dirty_pages
) {
2831 dout("dropping cap_snap %p follows %llu\n",
2832 capsnap
, capsnap
->follows
);
2833 BUG_ON(capsnap
->cap_flush
.tid
> 0);
2834 ceph_put_snap_context(capsnap
->context
);
2835 if (!list_is_last(&capsnap
->ci_item
, &ci
->i_cap_snaps
))
2836 ci
->i_ceph_flags
|= CEPH_I_FLUSH_SNAPS
;
2838 list_del(&capsnap
->ci_item
);
2839 ceph_put_cap_snap(capsnap
);
2848 * If we released the last ref on any given cap, call ceph_check_caps
2849 * to release (or schedule a release).
2851 * If we are releasing a WR cap (from a sync write), finalize any affected
2852 * cap_snap, and wake up any waiters.
2854 void ceph_put_cap_refs(struct ceph_inode_info
*ci
, int had
)
2856 struct inode
*inode
= &ci
->vfs_inode
;
2857 int last
= 0, put
= 0, flushsnaps
= 0, wake
= 0;
2859 spin_lock(&ci
->i_ceph_lock
);
2860 if (had
& CEPH_CAP_PIN
)
2862 if (had
& CEPH_CAP_FILE_RD
)
2863 if (--ci
->i_rd_ref
== 0)
2865 if (had
& CEPH_CAP_FILE_CACHE
)
2866 if (--ci
->i_rdcache_ref
== 0)
2868 if (had
& CEPH_CAP_FILE_BUFFER
) {
2869 if (--ci
->i_wb_ref
== 0) {
2873 dout("put_cap_refs %p wb %d -> %d (?)\n",
2874 inode
, ci
->i_wb_ref
+1, ci
->i_wb_ref
);
2876 if (had
& CEPH_CAP_FILE_WR
)
2877 if (--ci
->i_wr_ref
== 0) {
2879 if (__ceph_have_pending_cap_snap(ci
)) {
2880 struct ceph_cap_snap
*capsnap
=
2881 list_last_entry(&ci
->i_cap_snaps
,
2882 struct ceph_cap_snap
,
2884 capsnap
->writing
= 0;
2885 if (ceph_try_drop_cap_snap(ci
, capsnap
))
2887 else if (__ceph_finish_cap_snap(ci
, capsnap
))
2891 if (ci
->i_wrbuffer_ref_head
== 0 &&
2892 ci
->i_dirty_caps
== 0 &&
2893 ci
->i_flushing_caps
== 0) {
2894 BUG_ON(!ci
->i_head_snapc
);
2895 ceph_put_snap_context(ci
->i_head_snapc
);
2896 ci
->i_head_snapc
= NULL
;
2898 /* see comment in __ceph_remove_cap() */
2899 if (!__ceph_is_any_caps(ci
) && ci
->i_snap_realm
)
2900 drop_inode_snap_realm(ci
);
2902 spin_unlock(&ci
->i_ceph_lock
);
2904 dout("put_cap_refs %p had %s%s%s\n", inode
, ceph_cap_string(had
),
2905 last
? " last" : "", put
? " put" : "");
2907 if (last
&& !flushsnaps
)
2908 ceph_check_caps(ci
, 0, NULL
);
2909 else if (flushsnaps
)
2910 ceph_flush_snaps(ci
, NULL
);
2912 wake_up_all(&ci
->i_cap_wq
);
2918 * Release @nr WRBUFFER refs on dirty pages for the given @snapc snap
2919 * context. Adjust per-snap dirty page accounting as appropriate.
2920 * Once all dirty data for a cap_snap is flushed, flush snapped file
2921 * metadata back to the MDS. If we dropped the last ref, call
2924 void ceph_put_wrbuffer_cap_refs(struct ceph_inode_info
*ci
, int nr
,
2925 struct ceph_snap_context
*snapc
)
2927 struct inode
*inode
= &ci
->vfs_inode
;
2928 struct ceph_cap_snap
*capsnap
= NULL
;
2932 bool flush_snaps
= false;
2933 bool complete_capsnap
= false;
2935 spin_lock(&ci
->i_ceph_lock
);
2936 ci
->i_wrbuffer_ref
-= nr
;
2937 if (ci
->i_wrbuffer_ref
== 0) {
2942 if (ci
->i_head_snapc
== snapc
) {
2943 ci
->i_wrbuffer_ref_head
-= nr
;
2944 if (ci
->i_wrbuffer_ref_head
== 0 &&
2945 ci
->i_wr_ref
== 0 &&
2946 ci
->i_dirty_caps
== 0 &&
2947 ci
->i_flushing_caps
== 0) {
2948 BUG_ON(!ci
->i_head_snapc
);
2949 ceph_put_snap_context(ci
->i_head_snapc
);
2950 ci
->i_head_snapc
= NULL
;
2952 dout("put_wrbuffer_cap_refs on %p head %d/%d -> %d/%d %s\n",
2954 ci
->i_wrbuffer_ref
+nr
, ci
->i_wrbuffer_ref_head
+nr
,
2955 ci
->i_wrbuffer_ref
, ci
->i_wrbuffer_ref_head
,
2956 last
? " LAST" : "");
2958 list_for_each_entry(capsnap
, &ci
->i_cap_snaps
, ci_item
) {
2959 if (capsnap
->context
== snapc
) {
2965 capsnap
->dirty_pages
-= nr
;
2966 if (capsnap
->dirty_pages
== 0) {
2967 complete_capsnap
= true;
2968 if (!capsnap
->writing
) {
2969 if (ceph_try_drop_cap_snap(ci
, capsnap
)) {
2972 ci
->i_ceph_flags
|= CEPH_I_FLUSH_SNAPS
;
2977 dout("put_wrbuffer_cap_refs on %p cap_snap %p "
2978 " snap %lld %d/%d -> %d/%d %s%s\n",
2979 inode
, capsnap
, capsnap
->context
->seq
,
2980 ci
->i_wrbuffer_ref
+nr
, capsnap
->dirty_pages
+ nr
,
2981 ci
->i_wrbuffer_ref
, capsnap
->dirty_pages
,
2982 last
? " (wrbuffer last)" : "",
2983 complete_capsnap
? " (complete capsnap)" : "");
2986 spin_unlock(&ci
->i_ceph_lock
);
2989 ceph_check_caps(ci
, CHECK_CAPS_AUTHONLY
, NULL
);
2990 } else if (flush_snaps
) {
2991 ceph_flush_snaps(ci
, NULL
);
2993 if (complete_capsnap
)
2994 wake_up_all(&ci
->i_cap_wq
);
2996 /* avoid calling iput_final() in osd dispatch threads */
2997 ceph_async_iput(inode
);
3002 * Invalidate unlinked inode's aliases, so we can drop the inode ASAP.
3004 static void invalidate_aliases(struct inode
*inode
)
3006 struct dentry
*dn
, *prev
= NULL
;
3008 dout("invalidate_aliases inode %p\n", inode
);
3009 d_prune_aliases(inode
);
3011 * For non-directory inode, d_find_alias() only returns
3012 * hashed dentry. After calling d_invalidate(), the
3013 * dentry becomes unhashed.
3015 * For directory inode, d_find_alias() can return
3016 * unhashed dentry. But directory inode should have
3017 * one alias at most.
3019 while ((dn
= d_find_alias(inode
))) {
3033 struct cap_extra_info
{
3034 struct ceph_string
*pool_ns
;
3043 /* currently issued */
3048 * Handle a cap GRANT message from the MDS. (Note that a GRANT may
3049 * actually be a revocation if it specifies a smaller cap set.)
3051 * caller holds s_mutex and i_ceph_lock, we drop both.
3053 static void handle_cap_grant(struct inode
*inode
,
3054 struct ceph_mds_session
*session
,
3055 struct ceph_cap
*cap
,
3056 struct ceph_mds_caps
*grant
,
3057 struct ceph_buffer
*xattr_buf
,
3058 struct cap_extra_info
*extra_info
)
3059 __releases(ci
->i_ceph_lock
)
3060 __releases(session
->s_mdsc
->snap_rwsem
)
3062 struct ceph_inode_info
*ci
= ceph_inode(inode
);
3063 int seq
= le32_to_cpu(grant
->seq
);
3064 int newcaps
= le32_to_cpu(grant
->caps
);
3065 int used
, wanted
, dirty
;
3066 u64 size
= le64_to_cpu(grant
->size
);
3067 u64 max_size
= le64_to_cpu(grant
->max_size
);
3068 unsigned char check_caps
= 0;
3069 bool was_stale
= cap
->cap_gen
< session
->s_cap_gen
;
3071 bool writeback
= false;
3072 bool queue_trunc
= false;
3073 bool queue_invalidate
= false;
3074 bool deleted_inode
= false;
3075 bool fill_inline
= false;
3077 dout("handle_cap_grant inode %p cap %p mds%d seq %d %s\n",
3078 inode
, cap
, session
->s_mds
, seq
, ceph_cap_string(newcaps
));
3079 dout(" size %llu max_size %llu, i_size %llu\n", size
, max_size
,
3084 * If CACHE is being revoked, and we have no dirty buffers,
3085 * try to invalidate (once). (If there are dirty buffers, we
3086 * will invalidate _after_ writeback.)
3088 if (!S_ISDIR(inode
->i_mode
) && /* don't invalidate readdir cache */
3089 ((cap
->issued
& ~newcaps
) & CEPH_CAP_FILE_CACHE
) &&
3090 (newcaps
& CEPH_CAP_FILE_LAZYIO
) == 0 &&
3091 !(ci
->i_wrbuffer_ref
|| ci
->i_wb_ref
)) {
3092 if (try_nonblocking_invalidate(inode
)) {
3093 /* there were locked pages.. invalidate later
3094 in a separate thread. */
3095 if (ci
->i_rdcache_revoking
!= ci
->i_rdcache_gen
) {
3096 queue_invalidate
= true;
3097 ci
->i_rdcache_revoking
= ci
->i_rdcache_gen
;
3103 cap
->issued
= cap
->implemented
= CEPH_CAP_PIN
;
3106 * auth mds of the inode changed. we received the cap export message,
3107 * but still haven't received the cap import message. handle_cap_export
3108 * updated the new auth MDS' cap.
3110 * "ceph_seq_cmp(seq, cap->seq) <= 0" means we are processing a message
3111 * that was sent before the cap import message. So don't remove caps.
3113 if (ceph_seq_cmp(seq
, cap
->seq
) <= 0) {
3114 WARN_ON(cap
!= ci
->i_auth_cap
);
3115 WARN_ON(cap
->cap_id
!= le64_to_cpu(grant
->cap_id
));
3117 newcaps
|= cap
->issued
;
3120 /* side effects now are allowed */
3121 cap
->cap_gen
= session
->s_cap_gen
;
3124 __check_cap_issue(ci
, cap
, newcaps
);
3126 if ((newcaps
& CEPH_CAP_AUTH_SHARED
) &&
3127 (extra_info
->issued
& CEPH_CAP_AUTH_EXCL
) == 0) {
3128 inode
->i_mode
= le32_to_cpu(grant
->mode
);
3129 inode
->i_uid
= make_kuid(&init_user_ns
, le32_to_cpu(grant
->uid
));
3130 inode
->i_gid
= make_kgid(&init_user_ns
, le32_to_cpu(grant
->gid
));
3131 dout("%p mode 0%o uid.gid %d.%d\n", inode
, inode
->i_mode
,
3132 from_kuid(&init_user_ns
, inode
->i_uid
),
3133 from_kgid(&init_user_ns
, inode
->i_gid
));
3136 if ((newcaps
& CEPH_CAP_LINK_SHARED
) &&
3137 (extra_info
->issued
& CEPH_CAP_LINK_EXCL
) == 0) {
3138 set_nlink(inode
, le32_to_cpu(grant
->nlink
));
3139 if (inode
->i_nlink
== 0 &&
3140 (newcaps
& (CEPH_CAP_LINK_SHARED
| CEPH_CAP_LINK_EXCL
)))
3141 deleted_inode
= true;
3144 if ((extra_info
->issued
& CEPH_CAP_XATTR_EXCL
) == 0 &&
3146 int len
= le32_to_cpu(grant
->xattr_len
);
3147 u64 version
= le64_to_cpu(grant
->xattr_version
);
3149 if (version
> ci
->i_xattrs
.version
) {
3150 dout(" got new xattrs v%llu on %p len %d\n",
3151 version
, inode
, len
);
3152 if (ci
->i_xattrs
.blob
)
3153 ceph_buffer_put(ci
->i_xattrs
.blob
);
3154 ci
->i_xattrs
.blob
= ceph_buffer_get(xattr_buf
);
3155 ci
->i_xattrs
.version
= version
;
3156 ceph_forget_all_cached_acls(inode
);
3160 if (newcaps
& CEPH_CAP_ANY_RD
) {
3161 struct timespec64 mtime
, atime
, ctime
;
3162 /* ctime/mtime/atime? */
3163 ceph_decode_timespec64(&mtime
, &grant
->mtime
);
3164 ceph_decode_timespec64(&atime
, &grant
->atime
);
3165 ceph_decode_timespec64(&ctime
, &grant
->ctime
);
3166 ceph_fill_file_time(inode
, extra_info
->issued
,
3167 le32_to_cpu(grant
->time_warp_seq
),
3168 &ctime
, &mtime
, &atime
);
3171 if ((newcaps
& CEPH_CAP_FILE_SHARED
) && extra_info
->dirstat_valid
) {
3172 ci
->i_files
= extra_info
->nfiles
;
3173 ci
->i_subdirs
= extra_info
->nsubdirs
;
3176 if (newcaps
& (CEPH_CAP_ANY_FILE_RD
| CEPH_CAP_ANY_FILE_WR
)) {
3177 /* file layout may have changed */
3178 s64 old_pool
= ci
->i_layout
.pool_id
;
3179 struct ceph_string
*old_ns
;
3181 ceph_file_layout_from_legacy(&ci
->i_layout
, &grant
->layout
);
3182 old_ns
= rcu_dereference_protected(ci
->i_layout
.pool_ns
,
3183 lockdep_is_held(&ci
->i_ceph_lock
));
3184 rcu_assign_pointer(ci
->i_layout
.pool_ns
, extra_info
->pool_ns
);
3186 if (ci
->i_layout
.pool_id
!= old_pool
||
3187 extra_info
->pool_ns
!= old_ns
)
3188 ci
->i_ceph_flags
&= ~CEPH_I_POOL_PERM
;
3190 extra_info
->pool_ns
= old_ns
;
3192 /* size/truncate_seq? */
3193 queue_trunc
= ceph_fill_file_size(inode
, extra_info
->issued
,
3194 le32_to_cpu(grant
->truncate_seq
),
3195 le64_to_cpu(grant
->truncate_size
),
3199 if (ci
->i_auth_cap
== cap
&& (newcaps
& CEPH_CAP_ANY_FILE_WR
)) {
3200 if (max_size
!= ci
->i_max_size
) {
3201 dout("max_size %lld -> %llu\n",
3202 ci
->i_max_size
, max_size
);
3203 ci
->i_max_size
= max_size
;
3204 if (max_size
>= ci
->i_wanted_max_size
) {
3205 ci
->i_wanted_max_size
= 0; /* reset */
3206 ci
->i_requested_max_size
= 0;
3209 } else if (ci
->i_wanted_max_size
> ci
->i_max_size
&&
3210 ci
->i_wanted_max_size
> ci
->i_requested_max_size
) {
3211 /* CEPH_CAP_OP_IMPORT */
3216 /* check cap bits */
3217 wanted
= __ceph_caps_wanted(ci
);
3218 used
= __ceph_caps_used(ci
);
3219 dirty
= __ceph_caps_dirty(ci
);
3220 dout(" my wanted = %s, used = %s, dirty %s\n",
3221 ceph_cap_string(wanted
),
3222 ceph_cap_string(used
),
3223 ceph_cap_string(dirty
));
3225 if ((was_stale
|| le32_to_cpu(grant
->op
) == CEPH_CAP_OP_IMPORT
) &&
3226 (wanted
& ~(cap
->mds_wanted
| newcaps
))) {
3228 * If mds is importing cap, prior cap messages that update
3229 * 'wanted' may get dropped by mds (migrate seq mismatch).
3231 * We don't send cap message to update 'wanted' if what we
3232 * want are already issued. If mds revokes caps, cap message
3233 * that releases caps also tells mds what we want. But if
3234 * caps got revoked by mds forcedly (session stale). We may
3235 * haven't told mds what we want.
3240 /* revocation, grant, or no-op? */
3241 if (cap
->issued
& ~newcaps
) {
3242 int revoking
= cap
->issued
& ~newcaps
;
3244 dout("revocation: %s -> %s (revoking %s)\n",
3245 ceph_cap_string(cap
->issued
),
3246 ceph_cap_string(newcaps
),
3247 ceph_cap_string(revoking
));
3248 if (revoking
& used
& CEPH_CAP_FILE_BUFFER
)
3249 writeback
= true; /* initiate writeback; will delay ack */
3250 else if (revoking
== CEPH_CAP_FILE_CACHE
&&
3251 (newcaps
& CEPH_CAP_FILE_LAZYIO
) == 0 &&
3253 ; /* do nothing yet, invalidation will be queued */
3254 else if (cap
== ci
->i_auth_cap
)
3255 check_caps
= 1; /* check auth cap only */
3257 check_caps
= 2; /* check all caps */
3258 cap
->issued
= newcaps
;
3259 cap
->implemented
|= newcaps
;
3260 } else if (cap
->issued
== newcaps
) {
3261 dout("caps unchanged: %s -> %s\n",
3262 ceph_cap_string(cap
->issued
), ceph_cap_string(newcaps
));
3264 dout("grant: %s -> %s\n", ceph_cap_string(cap
->issued
),
3265 ceph_cap_string(newcaps
));
3266 /* non-auth MDS is revoking the newly grant caps ? */
3267 if (cap
== ci
->i_auth_cap
&&
3268 __ceph_caps_revoking_other(ci
, cap
, newcaps
))
3271 cap
->issued
= newcaps
;
3272 cap
->implemented
|= newcaps
; /* add bits only, to
3273 * avoid stepping on a
3274 * pending revocation */
3277 BUG_ON(cap
->issued
& ~cap
->implemented
);
3279 if (extra_info
->inline_version
> 0 &&
3280 extra_info
->inline_version
>= ci
->i_inline_version
) {
3281 ci
->i_inline_version
= extra_info
->inline_version
;
3282 if (ci
->i_inline_version
!= CEPH_INLINE_NONE
&&
3283 (newcaps
& (CEPH_CAP_FILE_CACHE
|CEPH_CAP_FILE_LAZYIO
)))
3287 if (le32_to_cpu(grant
->op
) == CEPH_CAP_OP_IMPORT
) {
3288 if (newcaps
& ~extra_info
->issued
)
3290 kick_flushing_inode_caps(session
->s_mdsc
, session
, inode
);
3291 up_read(&session
->s_mdsc
->snap_rwsem
);
3293 spin_unlock(&ci
->i_ceph_lock
);
3297 ceph_fill_inline_data(inode
, NULL
, extra_info
->inline_data
,
3298 extra_info
->inline_len
);
3301 ceph_queue_vmtruncate(inode
);
3305 * queue inode for writeback: we can't actually call
3306 * filemap_write_and_wait, etc. from message handler
3309 ceph_queue_writeback(inode
);
3310 if (queue_invalidate
)
3311 ceph_queue_invalidate(inode
);
3313 invalidate_aliases(inode
);
3315 wake_up_all(&ci
->i_cap_wq
);
3317 if (check_caps
== 1)
3318 ceph_check_caps(ci
, CHECK_CAPS_NODELAY
|CHECK_CAPS_AUTHONLY
,
3320 else if (check_caps
== 2)
3321 ceph_check_caps(ci
, CHECK_CAPS_NODELAY
, session
);
3323 mutex_unlock(&session
->s_mutex
);
3327 * Handle FLUSH_ACK from MDS, indicating that metadata we sent to the
3328 * MDS has been safely committed.
3330 static void handle_cap_flush_ack(struct inode
*inode
, u64 flush_tid
,
3331 struct ceph_mds_caps
*m
,
3332 struct ceph_mds_session
*session
,
3333 struct ceph_cap
*cap
)
3334 __releases(ci
->i_ceph_lock
)
3336 struct ceph_inode_info
*ci
= ceph_inode(inode
);
3337 struct ceph_mds_client
*mdsc
= ceph_sb_to_client(inode
->i_sb
)->mdsc
;
3338 struct ceph_cap_flush
*cf
, *tmp_cf
;
3339 LIST_HEAD(to_remove
);
3340 unsigned seq
= le32_to_cpu(m
->seq
);
3341 int dirty
= le32_to_cpu(m
->dirty
);
3344 bool wake_ci
= false;
3345 bool wake_mdsc
= false;
3347 list_for_each_entry_safe(cf
, tmp_cf
, &ci
->i_cap_flush_list
, i_list
) {
3348 if (cf
->tid
== flush_tid
)
3350 if (cf
->caps
== 0) /* capsnap */
3352 if (cf
->tid
<= flush_tid
) {
3353 if (__finish_cap_flush(NULL
, ci
, cf
))
3355 list_add_tail(&cf
->i_list
, &to_remove
);
3357 cleaned
&= ~cf
->caps
;
3363 dout("handle_cap_flush_ack inode %p mds%d seq %d on %s cleaned %s,"
3364 " flushing %s -> %s\n",
3365 inode
, session
->s_mds
, seq
, ceph_cap_string(dirty
),
3366 ceph_cap_string(cleaned
), ceph_cap_string(ci
->i_flushing_caps
),
3367 ceph_cap_string(ci
->i_flushing_caps
& ~cleaned
));
3369 if (list_empty(&to_remove
) && !cleaned
)
3372 ci
->i_flushing_caps
&= ~cleaned
;
3374 spin_lock(&mdsc
->cap_dirty_lock
);
3376 list_for_each_entry(cf
, &to_remove
, i_list
) {
3377 if (__finish_cap_flush(mdsc
, NULL
, cf
))
3381 if (ci
->i_flushing_caps
== 0) {
3382 if (list_empty(&ci
->i_cap_flush_list
)) {
3383 list_del_init(&ci
->i_flushing_item
);
3384 if (!list_empty(&session
->s_cap_flushing
)) {
3385 dout(" mds%d still flushing cap on %p\n",
3387 &list_first_entry(&session
->s_cap_flushing
,
3388 struct ceph_inode_info
,
3389 i_flushing_item
)->vfs_inode
);
3392 mdsc
->num_cap_flushing
--;
3393 dout(" inode %p now !flushing\n", inode
);
3395 if (ci
->i_dirty_caps
== 0) {
3396 dout(" inode %p now clean\n", inode
);
3397 BUG_ON(!list_empty(&ci
->i_dirty_item
));
3399 if (ci
->i_wr_ref
== 0 &&
3400 ci
->i_wrbuffer_ref_head
== 0) {
3401 BUG_ON(!ci
->i_head_snapc
);
3402 ceph_put_snap_context(ci
->i_head_snapc
);
3403 ci
->i_head_snapc
= NULL
;
3406 BUG_ON(list_empty(&ci
->i_dirty_item
));
3409 spin_unlock(&mdsc
->cap_dirty_lock
);
3412 spin_unlock(&ci
->i_ceph_lock
);
3414 while (!list_empty(&to_remove
)) {
3415 cf
= list_first_entry(&to_remove
,
3416 struct ceph_cap_flush
, i_list
);
3417 list_del(&cf
->i_list
);
3418 ceph_free_cap_flush(cf
);
3422 wake_up_all(&ci
->i_cap_wq
);
3424 wake_up_all(&mdsc
->cap_flushing_wq
);
3430 * Handle FLUSHSNAP_ACK. MDS has flushed snap data to disk and we can
3431 * throw away our cap_snap.
3433 * Caller hold s_mutex.
3435 static void handle_cap_flushsnap_ack(struct inode
*inode
, u64 flush_tid
,
3436 struct ceph_mds_caps
*m
,
3437 struct ceph_mds_session
*session
)
3439 struct ceph_inode_info
*ci
= ceph_inode(inode
);
3440 struct ceph_mds_client
*mdsc
= ceph_sb_to_client(inode
->i_sb
)->mdsc
;
3441 u64 follows
= le64_to_cpu(m
->snap_follows
);
3442 struct ceph_cap_snap
*capsnap
;
3443 bool flushed
= false;
3444 bool wake_ci
= false;
3445 bool wake_mdsc
= false;
3447 dout("handle_cap_flushsnap_ack inode %p ci %p mds%d follows %lld\n",
3448 inode
, ci
, session
->s_mds
, follows
);
3450 spin_lock(&ci
->i_ceph_lock
);
3451 list_for_each_entry(capsnap
, &ci
->i_cap_snaps
, ci_item
) {
3452 if (capsnap
->follows
== follows
) {
3453 if (capsnap
->cap_flush
.tid
!= flush_tid
) {
3454 dout(" cap_snap %p follows %lld tid %lld !="
3455 " %lld\n", capsnap
, follows
,
3456 flush_tid
, capsnap
->cap_flush
.tid
);
3462 dout(" skipping cap_snap %p follows %lld\n",
3463 capsnap
, capsnap
->follows
);
3467 WARN_ON(capsnap
->dirty_pages
|| capsnap
->writing
);
3468 dout(" removing %p cap_snap %p follows %lld\n",
3469 inode
, capsnap
, follows
);
3470 list_del(&capsnap
->ci_item
);
3471 if (__finish_cap_flush(NULL
, ci
, &capsnap
->cap_flush
))
3474 spin_lock(&mdsc
->cap_dirty_lock
);
3476 if (list_empty(&ci
->i_cap_flush_list
))
3477 list_del_init(&ci
->i_flushing_item
);
3479 if (__finish_cap_flush(mdsc
, NULL
, &capsnap
->cap_flush
))
3482 spin_unlock(&mdsc
->cap_dirty_lock
);
3484 spin_unlock(&ci
->i_ceph_lock
);
3486 ceph_put_snap_context(capsnap
->context
);
3487 ceph_put_cap_snap(capsnap
);
3489 wake_up_all(&ci
->i_cap_wq
);
3491 wake_up_all(&mdsc
->cap_flushing_wq
);
3497 * Handle TRUNC from MDS, indicating file truncation.
3499 * caller hold s_mutex.
3501 static void handle_cap_trunc(struct inode
*inode
,
3502 struct ceph_mds_caps
*trunc
,
3503 struct ceph_mds_session
*session
)
3504 __releases(ci
->i_ceph_lock
)
3506 struct ceph_inode_info
*ci
= ceph_inode(inode
);
3507 int mds
= session
->s_mds
;
3508 int seq
= le32_to_cpu(trunc
->seq
);
3509 u32 truncate_seq
= le32_to_cpu(trunc
->truncate_seq
);
3510 u64 truncate_size
= le64_to_cpu(trunc
->truncate_size
);
3511 u64 size
= le64_to_cpu(trunc
->size
);
3512 int implemented
= 0;
3513 int dirty
= __ceph_caps_dirty(ci
);
3514 int issued
= __ceph_caps_issued(ceph_inode(inode
), &implemented
);
3515 int queue_trunc
= 0;
3517 issued
|= implemented
| dirty
;
3519 dout("handle_cap_trunc inode %p mds%d seq %d to %lld seq %d\n",
3520 inode
, mds
, seq
, truncate_size
, truncate_seq
);
3521 queue_trunc
= ceph_fill_file_size(inode
, issued
,
3522 truncate_seq
, truncate_size
, size
);
3523 spin_unlock(&ci
->i_ceph_lock
);
3526 ceph_queue_vmtruncate(inode
);
3530 * Handle EXPORT from MDS. Cap is being migrated _from_ this mds to a
3531 * different one. If we are the most recent migration we've seen (as
3532 * indicated by mseq), make note of the migrating cap bits for the
3533 * duration (until we see the corresponding IMPORT).
3535 * caller holds s_mutex
3537 static void handle_cap_export(struct inode
*inode
, struct ceph_mds_caps
*ex
,
3538 struct ceph_mds_cap_peer
*ph
,
3539 struct ceph_mds_session
*session
)
3541 struct ceph_mds_client
*mdsc
= ceph_inode_to_client(inode
)->mdsc
;
3542 struct ceph_mds_session
*tsession
= NULL
;
3543 struct ceph_cap
*cap
, *tcap
, *new_cap
= NULL
;
3544 struct ceph_inode_info
*ci
= ceph_inode(inode
);
3546 unsigned mseq
= le32_to_cpu(ex
->migrate_seq
);
3547 unsigned t_seq
, t_mseq
;
3549 int mds
= session
->s_mds
;
3552 t_cap_id
= le64_to_cpu(ph
->cap_id
);
3553 t_seq
= le32_to_cpu(ph
->seq
);
3554 t_mseq
= le32_to_cpu(ph
->mseq
);
3555 target
= le32_to_cpu(ph
->mds
);
3557 t_cap_id
= t_seq
= t_mseq
= 0;
3561 dout("handle_cap_export inode %p ci %p mds%d mseq %d target %d\n",
3562 inode
, ci
, mds
, mseq
, target
);
3564 spin_lock(&ci
->i_ceph_lock
);
3565 cap
= __get_cap_for_mds(ci
, mds
);
3566 if (!cap
|| cap
->cap_id
!= le64_to_cpu(ex
->cap_id
))
3570 if (cap
->mds_wanted
| cap
->issued
)
3571 ci
->i_ceph_flags
|= CEPH_I_CAP_DROPPED
;
3572 __ceph_remove_cap(cap
, false);
3577 * now we know we haven't received the cap import message yet
3578 * because the exported cap still exist.
3581 issued
= cap
->issued
;
3582 if (issued
!= cap
->implemented
)
3583 pr_err_ratelimited("handle_cap_export: issued != implemented: "
3584 "ino (%llx.%llx) mds%d seq %d mseq %d "
3585 "issued %s implemented %s\n",
3586 ceph_vinop(inode
), mds
, cap
->seq
, cap
->mseq
,
3587 ceph_cap_string(issued
),
3588 ceph_cap_string(cap
->implemented
));
3591 tcap
= __get_cap_for_mds(ci
, target
);
3593 /* already have caps from the target */
3594 if (tcap
->cap_id
== t_cap_id
&&
3595 ceph_seq_cmp(tcap
->seq
, t_seq
) < 0) {
3596 dout(" updating import cap %p mds%d\n", tcap
, target
);
3597 tcap
->cap_id
= t_cap_id
;
3598 tcap
->seq
= t_seq
- 1;
3599 tcap
->issue_seq
= t_seq
- 1;
3600 tcap
->issued
|= issued
;
3601 tcap
->implemented
|= issued
;
3602 if (cap
== ci
->i_auth_cap
)
3603 ci
->i_auth_cap
= tcap
;
3605 if (!list_empty(&ci
->i_cap_flush_list
) &&
3606 ci
->i_auth_cap
== tcap
) {
3607 spin_lock(&mdsc
->cap_dirty_lock
);
3608 list_move_tail(&ci
->i_flushing_item
,
3609 &tcap
->session
->s_cap_flushing
);
3610 spin_unlock(&mdsc
->cap_dirty_lock
);
3613 __ceph_remove_cap(cap
, false);
3615 } else if (tsession
) {
3616 /* add placeholder for the export tagert */
3617 int flag
= (cap
== ci
->i_auth_cap
) ? CEPH_CAP_FLAG_AUTH
: 0;
3619 ceph_add_cap(inode
, tsession
, t_cap_id
, -1, issued
, 0,
3620 t_seq
- 1, t_mseq
, (u64
)-1, flag
, &new_cap
);
3622 if (!list_empty(&ci
->i_cap_flush_list
) &&
3623 ci
->i_auth_cap
== tcap
) {
3624 spin_lock(&mdsc
->cap_dirty_lock
);
3625 list_move_tail(&ci
->i_flushing_item
,
3626 &tcap
->session
->s_cap_flushing
);
3627 spin_unlock(&mdsc
->cap_dirty_lock
);
3630 __ceph_remove_cap(cap
, false);
3634 spin_unlock(&ci
->i_ceph_lock
);
3635 mutex_unlock(&session
->s_mutex
);
3637 /* open target session */
3638 tsession
= ceph_mdsc_open_export_target_session(mdsc
, target
);
3639 if (!IS_ERR(tsession
)) {
3641 mutex_lock(&session
->s_mutex
);
3642 mutex_lock_nested(&tsession
->s_mutex
,
3643 SINGLE_DEPTH_NESTING
);
3645 mutex_lock(&tsession
->s_mutex
);
3646 mutex_lock_nested(&session
->s_mutex
,
3647 SINGLE_DEPTH_NESTING
);
3649 new_cap
= ceph_get_cap(mdsc
, NULL
);
3658 spin_unlock(&ci
->i_ceph_lock
);
3659 mutex_unlock(&session
->s_mutex
);
3661 mutex_unlock(&tsession
->s_mutex
);
3662 ceph_put_mds_session(tsession
);
3665 ceph_put_cap(mdsc
, new_cap
);
3669 * Handle cap IMPORT.
3671 * caller holds s_mutex. acquires i_ceph_lock
3673 static void handle_cap_import(struct ceph_mds_client
*mdsc
,
3674 struct inode
*inode
, struct ceph_mds_caps
*im
,
3675 struct ceph_mds_cap_peer
*ph
,
3676 struct ceph_mds_session
*session
,
3677 struct ceph_cap
**target_cap
, int *old_issued
)
3678 __acquires(ci
->i_ceph_lock
)
3680 struct ceph_inode_info
*ci
= ceph_inode(inode
);
3681 struct ceph_cap
*cap
, *ocap
, *new_cap
= NULL
;
3682 int mds
= session
->s_mds
;
3684 unsigned caps
= le32_to_cpu(im
->caps
);
3685 unsigned wanted
= le32_to_cpu(im
->wanted
);
3686 unsigned seq
= le32_to_cpu(im
->seq
);
3687 unsigned mseq
= le32_to_cpu(im
->migrate_seq
);
3688 u64 realmino
= le64_to_cpu(im
->realm
);
3689 u64 cap_id
= le64_to_cpu(im
->cap_id
);
3694 p_cap_id
= le64_to_cpu(ph
->cap_id
);
3695 peer
= le32_to_cpu(ph
->mds
);
3701 dout("handle_cap_import inode %p ci %p mds%d mseq %d peer %d\n",
3702 inode
, ci
, mds
, mseq
, peer
);
3705 spin_lock(&ci
->i_ceph_lock
);
3706 cap
= __get_cap_for_mds(ci
, mds
);
3709 spin_unlock(&ci
->i_ceph_lock
);
3710 new_cap
= ceph_get_cap(mdsc
, NULL
);
3716 ceph_put_cap(mdsc
, new_cap
);
3721 __ceph_caps_issued(ci
, &issued
);
3722 issued
|= __ceph_caps_dirty(ci
);
3724 ceph_add_cap(inode
, session
, cap_id
, -1, caps
, wanted
, seq
, mseq
,
3725 realmino
, CEPH_CAP_FLAG_AUTH
, &new_cap
);
3727 ocap
= peer
>= 0 ? __get_cap_for_mds(ci
, peer
) : NULL
;
3728 if (ocap
&& ocap
->cap_id
== p_cap_id
) {
3729 dout(" remove export cap %p mds%d flags %d\n",
3730 ocap
, peer
, ph
->flags
);
3731 if ((ph
->flags
& CEPH_CAP_FLAG_AUTH
) &&
3732 (ocap
->seq
!= le32_to_cpu(ph
->seq
) ||
3733 ocap
->mseq
!= le32_to_cpu(ph
->mseq
))) {
3734 pr_err_ratelimited("handle_cap_import: "
3735 "mismatched seq/mseq: ino (%llx.%llx) "
3736 "mds%d seq %d mseq %d importer mds%d "
3737 "has peer seq %d mseq %d\n",
3738 ceph_vinop(inode
), peer
, ocap
->seq
,
3739 ocap
->mseq
, mds
, le32_to_cpu(ph
->seq
),
3740 le32_to_cpu(ph
->mseq
));
3742 __ceph_remove_cap(ocap
, (ph
->flags
& CEPH_CAP_FLAG_RELEASE
));
3745 /* make sure we re-request max_size, if necessary */
3746 ci
->i_requested_max_size
= 0;
3748 *old_issued
= issued
;
3753 * Handle a caps message from the MDS.
3755 * Identify the appropriate session, inode, and call the right handler
3756 * based on the cap op.
3758 void ceph_handle_caps(struct ceph_mds_session
*session
,
3759 struct ceph_msg
*msg
)
3761 struct ceph_mds_client
*mdsc
= session
->s_mdsc
;
3762 struct inode
*inode
;
3763 struct ceph_inode_info
*ci
;
3764 struct ceph_cap
*cap
;
3765 struct ceph_mds_caps
*h
;
3766 struct ceph_mds_cap_peer
*peer
= NULL
;
3767 struct ceph_snap_realm
*realm
= NULL
;
3769 int msg_version
= le16_to_cpu(msg
->hdr
.version
);
3771 struct ceph_vino vino
;
3773 size_t snaptrace_len
;
3775 struct cap_extra_info extra_info
= {};
3777 dout("handle_caps from mds%d\n", session
->s_mds
);
3780 end
= msg
->front
.iov_base
+ msg
->front
.iov_len
;
3781 if (msg
->front
.iov_len
< sizeof(*h
))
3783 h
= msg
->front
.iov_base
;
3784 op
= le32_to_cpu(h
->op
);
3785 vino
.ino
= le64_to_cpu(h
->ino
);
3786 vino
.snap
= CEPH_NOSNAP
;
3787 seq
= le32_to_cpu(h
->seq
);
3788 mseq
= le32_to_cpu(h
->migrate_seq
);
3791 snaptrace_len
= le32_to_cpu(h
->snap_trace_len
);
3792 p
= snaptrace
+ snaptrace_len
;
3794 if (msg_version
>= 2) {
3796 ceph_decode_32_safe(&p
, end
, flock_len
, bad
);
3797 if (p
+ flock_len
> end
)
3802 if (msg_version
>= 3) {
3803 if (op
== CEPH_CAP_OP_IMPORT
) {
3804 if (p
+ sizeof(*peer
) > end
)
3808 } else if (op
== CEPH_CAP_OP_EXPORT
) {
3809 /* recorded in unused fields */
3810 peer
= (void *)&h
->size
;
3814 if (msg_version
>= 4) {
3815 ceph_decode_64_safe(&p
, end
, extra_info
.inline_version
, bad
);
3816 ceph_decode_32_safe(&p
, end
, extra_info
.inline_len
, bad
);
3817 if (p
+ extra_info
.inline_len
> end
)
3819 extra_info
.inline_data
= p
;
3820 p
+= extra_info
.inline_len
;
3823 if (msg_version
>= 5) {
3824 struct ceph_osd_client
*osdc
= &mdsc
->fsc
->client
->osdc
;
3827 ceph_decode_32_safe(&p
, end
, epoch_barrier
, bad
);
3828 ceph_osdc_update_epoch_barrier(osdc
, epoch_barrier
);
3831 if (msg_version
>= 8) {
3833 u32 caller_uid
, caller_gid
;
3837 ceph_decode_64_safe(&p
, end
, flush_tid
, bad
);
3839 ceph_decode_32_safe(&p
, end
, caller_uid
, bad
);
3840 ceph_decode_32_safe(&p
, end
, caller_gid
, bad
);
3842 ceph_decode_32_safe(&p
, end
, pool_ns_len
, bad
);
3843 if (pool_ns_len
> 0) {
3844 ceph_decode_need(&p
, end
, pool_ns_len
, bad
);
3845 extra_info
.pool_ns
=
3846 ceph_find_or_create_string(p
, pool_ns_len
);
3851 if (msg_version
>= 11) {
3852 struct ceph_timespec
*btime
;
3857 if (p
+ sizeof(*btime
) > end
)
3860 p
+= sizeof(*btime
);
3861 ceph_decode_64_safe(&p
, end
, change_attr
, bad
);
3863 ceph_decode_32_safe(&p
, end
, flags
, bad
);
3865 extra_info
.dirstat_valid
= true;
3866 ceph_decode_64_safe(&p
, end
, extra_info
.nfiles
, bad
);
3867 ceph_decode_64_safe(&p
, end
, extra_info
.nsubdirs
, bad
);
3871 inode
= ceph_find_inode(mdsc
->fsc
->sb
, vino
);
3872 ci
= ceph_inode(inode
);
3873 dout(" op %s ino %llx.%llx inode %p\n", ceph_cap_op_name(op
), vino
.ino
,
3876 mutex_lock(&session
->s_mutex
);
3878 dout(" mds%d seq %lld cap seq %u\n", session
->s_mds
, session
->s_seq
,
3882 dout(" i don't have ino %llx\n", vino
.ino
);
3884 if (op
== CEPH_CAP_OP_IMPORT
) {
3885 cap
= ceph_get_cap(mdsc
, NULL
);
3886 cap
->cap_ino
= vino
.ino
;
3887 cap
->queue_release
= 1;
3888 cap
->cap_id
= le64_to_cpu(h
->cap_id
);
3891 cap
->issue_seq
= seq
;
3892 spin_lock(&session
->s_cap_lock
);
3893 __ceph_queue_cap_release(session
, cap
);
3894 spin_unlock(&session
->s_cap_lock
);
3899 /* these will work even if we don't have a cap yet */
3901 case CEPH_CAP_OP_FLUSHSNAP_ACK
:
3902 handle_cap_flushsnap_ack(inode
, le64_to_cpu(msg
->hdr
.tid
),
3906 case CEPH_CAP_OP_EXPORT
:
3907 handle_cap_export(inode
, h
, peer
, session
);
3910 case CEPH_CAP_OP_IMPORT
:
3912 if (snaptrace_len
) {
3913 down_write(&mdsc
->snap_rwsem
);
3914 ceph_update_snap_trace(mdsc
, snaptrace
,
3915 snaptrace
+ snaptrace_len
,
3917 downgrade_write(&mdsc
->snap_rwsem
);
3919 down_read(&mdsc
->snap_rwsem
);
3921 handle_cap_import(mdsc
, inode
, h
, peer
, session
,
3922 &cap
, &extra_info
.issued
);
3923 handle_cap_grant(inode
, session
, cap
,
3924 h
, msg
->middle
, &extra_info
);
3926 ceph_put_snap_realm(mdsc
, realm
);
3930 /* the rest require a cap */
3931 spin_lock(&ci
->i_ceph_lock
);
3932 cap
= __get_cap_for_mds(ceph_inode(inode
), session
->s_mds
);
3934 dout(" no cap on %p ino %llx.%llx from mds%d\n",
3935 inode
, ceph_ino(inode
), ceph_snap(inode
),
3937 spin_unlock(&ci
->i_ceph_lock
);
3938 goto flush_cap_releases
;
3941 /* note that each of these drops i_ceph_lock for us */
3943 case CEPH_CAP_OP_REVOKE
:
3944 case CEPH_CAP_OP_GRANT
:
3945 __ceph_caps_issued(ci
, &extra_info
.issued
);
3946 extra_info
.issued
|= __ceph_caps_dirty(ci
);
3947 handle_cap_grant(inode
, session
, cap
,
3948 h
, msg
->middle
, &extra_info
);
3951 case CEPH_CAP_OP_FLUSH_ACK
:
3952 handle_cap_flush_ack(inode
, le64_to_cpu(msg
->hdr
.tid
),
3956 case CEPH_CAP_OP_TRUNC
:
3957 handle_cap_trunc(inode
, h
, session
);
3961 spin_unlock(&ci
->i_ceph_lock
);
3962 pr_err("ceph_handle_caps: unknown cap op %d %s\n", op
,
3963 ceph_cap_op_name(op
));
3967 mutex_unlock(&session
->s_mutex
);
3969 ceph_put_string(extra_info
.pool_ns
);
3970 /* avoid calling iput_final() in mds dispatch threads */
3971 ceph_async_iput(inode
);
3976 * send any cap release message to try to move things
3977 * along for the mds (who clearly thinks we still have this
3980 ceph_flush_cap_releases(mdsc
, session
);
3984 pr_err("ceph_handle_caps: corrupt message\n");
3990 * Delayed work handler to process end of delayed cap release LRU list.
3992 void ceph_check_delayed_caps(struct ceph_mds_client
*mdsc
)
3994 struct inode
*inode
;
3995 struct ceph_inode_info
*ci
;
3996 int flags
= CHECK_CAPS_NODELAY
;
3998 dout("check_delayed_caps\n");
4000 spin_lock(&mdsc
->cap_delay_lock
);
4001 if (list_empty(&mdsc
->cap_delay_list
))
4003 ci
= list_first_entry(&mdsc
->cap_delay_list
,
4004 struct ceph_inode_info
,
4006 if ((ci
->i_ceph_flags
& CEPH_I_FLUSH
) == 0 &&
4007 time_before(jiffies
, ci
->i_hold_caps_max
))
4009 list_del_init(&ci
->i_cap_delay_list
);
4011 inode
= igrab(&ci
->vfs_inode
);
4012 spin_unlock(&mdsc
->cap_delay_lock
);
4015 dout("check_delayed_caps on %p\n", inode
);
4016 ceph_check_caps(ci
, flags
, NULL
);
4017 /* avoid calling iput_final() in tick thread */
4018 ceph_async_iput(inode
);
4021 spin_unlock(&mdsc
->cap_delay_lock
);
4025 * Flush all dirty caps to the mds
4027 void ceph_flush_dirty_caps(struct ceph_mds_client
*mdsc
)
4029 struct ceph_inode_info
*ci
;
4030 struct inode
*inode
;
4032 dout("flush_dirty_caps\n");
4033 spin_lock(&mdsc
->cap_dirty_lock
);
4034 while (!list_empty(&mdsc
->cap_dirty
)) {
4035 ci
= list_first_entry(&mdsc
->cap_dirty
, struct ceph_inode_info
,
4037 inode
= &ci
->vfs_inode
;
4039 dout("flush_dirty_caps %p\n", inode
);
4040 spin_unlock(&mdsc
->cap_dirty_lock
);
4041 ceph_check_caps(ci
, CHECK_CAPS_NODELAY
|CHECK_CAPS_FLUSH
, NULL
);
4043 spin_lock(&mdsc
->cap_dirty_lock
);
4045 spin_unlock(&mdsc
->cap_dirty_lock
);
4046 dout("flush_dirty_caps done\n");
4049 void __ceph_get_fmode(struct ceph_inode_info
*ci
, int fmode
)
4052 int bits
= (fmode
<< 1) | 1;
4053 for (i
= 0; i
< CEPH_FILE_MODE_BITS
; i
++) {
4054 if (bits
& (1 << i
))
4055 ci
->i_nr_by_mode
[i
]++;
4060 * Drop open file reference. If we were the last open file,
4061 * we may need to release capabilities to the MDS (or schedule
4062 * their delayed release).
4064 void ceph_put_fmode(struct ceph_inode_info
*ci
, int fmode
)
4067 int bits
= (fmode
<< 1) | 1;
4068 spin_lock(&ci
->i_ceph_lock
);
4069 for (i
= 0; i
< CEPH_FILE_MODE_BITS
; i
++) {
4070 if (bits
& (1 << i
)) {
4071 BUG_ON(ci
->i_nr_by_mode
[i
] == 0);
4072 if (--ci
->i_nr_by_mode
[i
] == 0)
4076 dout("put_fmode %p fmode %d {%d,%d,%d,%d}\n",
4077 &ci
->vfs_inode
, fmode
,
4078 ci
->i_nr_by_mode
[0], ci
->i_nr_by_mode
[1],
4079 ci
->i_nr_by_mode
[2], ci
->i_nr_by_mode
[3]);
4080 spin_unlock(&ci
->i_ceph_lock
);
4082 if (last
&& ci
->i_vino
.snap
== CEPH_NOSNAP
)
4083 ceph_check_caps(ci
, 0, NULL
);
4087 * For a soon-to-be unlinked file, drop the LINK caps. If it
4088 * looks like the link count will hit 0, drop any other caps (other
4089 * than PIN) we don't specifically want (due to the file still being
4092 int ceph_drop_caps_for_unlink(struct inode
*inode
)
4094 struct ceph_inode_info
*ci
= ceph_inode(inode
);
4095 int drop
= CEPH_CAP_LINK_SHARED
| CEPH_CAP_LINK_EXCL
;
4097 spin_lock(&ci
->i_ceph_lock
);
4098 if (inode
->i_nlink
== 1) {
4099 drop
|= ~(__ceph_caps_wanted(ci
) | CEPH_CAP_PIN
);
4101 ci
->i_ceph_flags
|= CEPH_I_NODELAY
;
4102 if (__ceph_caps_dirty(ci
)) {
4103 struct ceph_mds_client
*mdsc
=
4104 ceph_inode_to_client(inode
)->mdsc
;
4105 __cap_delay_requeue_front(mdsc
, ci
);
4108 spin_unlock(&ci
->i_ceph_lock
);
4113 * Helpers for embedding cap and dentry lease releases into mds
4116 * @force is used by dentry_release (below) to force inclusion of a
4117 * record for the directory inode, even when there aren't any caps to
4120 int ceph_encode_inode_release(void **p
, struct inode
*inode
,
4121 int mds
, int drop
, int unless
, int force
)
4123 struct ceph_inode_info
*ci
= ceph_inode(inode
);
4124 struct ceph_cap
*cap
;
4125 struct ceph_mds_request_release
*rel
= *p
;
4129 spin_lock(&ci
->i_ceph_lock
);
4130 used
= __ceph_caps_used(ci
);
4131 dirty
= __ceph_caps_dirty(ci
);
4133 dout("encode_inode_release %p mds%d used|dirty %s drop %s unless %s\n",
4134 inode
, mds
, ceph_cap_string(used
|dirty
), ceph_cap_string(drop
),
4135 ceph_cap_string(unless
));
4137 /* only drop unused, clean caps */
4138 drop
&= ~(used
| dirty
);
4140 cap
= __get_cap_for_mds(ci
, mds
);
4141 if (cap
&& __cap_is_valid(cap
)) {
4142 unless
&= cap
->issued
;
4144 if (unless
& CEPH_CAP_AUTH_EXCL
)
4145 drop
&= ~CEPH_CAP_AUTH_SHARED
;
4146 if (unless
& CEPH_CAP_LINK_EXCL
)
4147 drop
&= ~CEPH_CAP_LINK_SHARED
;
4148 if (unless
& CEPH_CAP_XATTR_EXCL
)
4149 drop
&= ~CEPH_CAP_XATTR_SHARED
;
4150 if (unless
& CEPH_CAP_FILE_EXCL
)
4151 drop
&= ~CEPH_CAP_FILE_SHARED
;
4154 if (force
|| (cap
->issued
& drop
)) {
4155 if (cap
->issued
& drop
) {
4156 int wanted
= __ceph_caps_wanted(ci
);
4157 if ((ci
->i_ceph_flags
& CEPH_I_NODELAY
) == 0)
4158 wanted
|= cap
->mds_wanted
;
4159 dout("encode_inode_release %p cap %p "
4160 "%s -> %s, wanted %s -> %s\n", inode
, cap
,
4161 ceph_cap_string(cap
->issued
),
4162 ceph_cap_string(cap
->issued
& ~drop
),
4163 ceph_cap_string(cap
->mds_wanted
),
4164 ceph_cap_string(wanted
));
4166 cap
->issued
&= ~drop
;
4167 cap
->implemented
&= ~drop
;
4168 cap
->mds_wanted
= wanted
;
4170 dout("encode_inode_release %p cap %p %s"
4171 " (force)\n", inode
, cap
,
4172 ceph_cap_string(cap
->issued
));
4175 rel
->ino
= cpu_to_le64(ceph_ino(inode
));
4176 rel
->cap_id
= cpu_to_le64(cap
->cap_id
);
4177 rel
->seq
= cpu_to_le32(cap
->seq
);
4178 rel
->issue_seq
= cpu_to_le32(cap
->issue_seq
);
4179 rel
->mseq
= cpu_to_le32(cap
->mseq
);
4180 rel
->caps
= cpu_to_le32(cap
->implemented
);
4181 rel
->wanted
= cpu_to_le32(cap
->mds_wanted
);
4187 dout("encode_inode_release %p cap %p %s (noop)\n",
4188 inode
, cap
, ceph_cap_string(cap
->issued
));
4191 spin_unlock(&ci
->i_ceph_lock
);
4195 int ceph_encode_dentry_release(void **p
, struct dentry
*dentry
,
4197 int mds
, int drop
, int unless
)
4199 struct dentry
*parent
= NULL
;
4200 struct ceph_mds_request_release
*rel
= *p
;
4201 struct ceph_dentry_info
*di
= ceph_dentry(dentry
);
4206 * force an record for the directory caps if we have a dentry lease.
4207 * this is racy (can't take i_ceph_lock and d_lock together), but it
4208 * doesn't have to be perfect; the mds will revoke anything we don't
4211 spin_lock(&dentry
->d_lock
);
4212 if (di
->lease_session
&& di
->lease_session
->s_mds
== mds
)
4215 parent
= dget(dentry
->d_parent
);
4216 dir
= d_inode(parent
);
4218 spin_unlock(&dentry
->d_lock
);
4220 ret
= ceph_encode_inode_release(p
, dir
, mds
, drop
, unless
, force
);
4223 spin_lock(&dentry
->d_lock
);
4224 if (ret
&& di
->lease_session
&& di
->lease_session
->s_mds
== mds
) {
4225 dout("encode_dentry_release %p mds%d seq %d\n",
4226 dentry
, mds
, (int)di
->lease_seq
);
4227 rel
->dname_len
= cpu_to_le32(dentry
->d_name
.len
);
4228 memcpy(*p
, dentry
->d_name
.name
, dentry
->d_name
.len
);
4229 *p
+= dentry
->d_name
.len
;
4230 rel
->dname_seq
= cpu_to_le32(di
->lease_seq
);
4231 __ceph_mdsc_drop_dentry_lease(dentry
);
4233 spin_unlock(&dentry
->d_lock
);