1 #include <linux/ceph/ceph_debug.h>
4 #include <linux/kernel.h>
5 #include <linux/sched.h>
6 #include <linux/slab.h>
7 #include <linux/vmalloc.h>
8 #include <linux/wait.h>
9 #include <linux/writeback.h>
12 #include "mds_client.h"
14 #include <linux/ceph/decode.h>
15 #include <linux/ceph/messenger.h>
18 * Capability management
20 * The Ceph metadata servers control client access to inode metadata
21 * and file data by issuing capabilities, granting clients permission
22 * to read and/or write both inode field and file data to OSDs
23 * (storage nodes). Each capability consists of a set of bits
24 * indicating which operations are allowed.
26 * If the client holds a *_SHARED cap, the client has a coherent value
27 * that can be safely read from the cached inode.
29 * In the case of a *_EXCL (exclusive) or FILE_WR capabilities, the
30 * client is allowed to change inode attributes (e.g., file size,
31 * mtime), note its dirty state in the ceph_cap, and asynchronously
32 * flush that metadata change to the MDS.
34 * In the event of a conflicting operation (perhaps by another
35 * client), the MDS will revoke the conflicting client capabilities.
37 * In order for a client to cache an inode, it must hold a capability
38 * with at least one MDS server. When inodes are released, release
39 * notifications are batched and periodically sent en masse to the MDS
40 * cluster to release server state.
45 * Generate readable cap strings for debugging output.
47 #define MAX_CAP_STR 20
48 static char cap_str
[MAX_CAP_STR
][40];
49 static DEFINE_SPINLOCK(cap_str_lock
);
50 static int last_cap_str
;
52 static char *gcap_string(char *s
, int c
)
54 if (c
& CEPH_CAP_GSHARED
)
56 if (c
& CEPH_CAP_GEXCL
)
58 if (c
& CEPH_CAP_GCACHE
)
64 if (c
& CEPH_CAP_GBUFFER
)
66 if (c
& CEPH_CAP_GLAZYIO
)
71 const char *ceph_cap_string(int caps
)
77 spin_lock(&cap_str_lock
);
79 if (last_cap_str
== MAX_CAP_STR
)
81 spin_unlock(&cap_str_lock
);
85 if (caps
& CEPH_CAP_PIN
)
88 c
= (caps
>> CEPH_CAP_SAUTH
) & 3;
91 s
= gcap_string(s
, c
);
94 c
= (caps
>> CEPH_CAP_SLINK
) & 3;
97 s
= gcap_string(s
, c
);
100 c
= (caps
>> CEPH_CAP_SXATTR
) & 3;
103 s
= gcap_string(s
, c
);
106 c
= caps
>> CEPH_CAP_SFILE
;
109 s
= gcap_string(s
, c
);
118 void ceph_caps_init(struct ceph_mds_client
*mdsc
)
120 INIT_LIST_HEAD(&mdsc
->caps_list
);
121 spin_lock_init(&mdsc
->caps_list_lock
);
124 void ceph_caps_finalize(struct ceph_mds_client
*mdsc
)
126 struct ceph_cap
*cap
;
128 spin_lock(&mdsc
->caps_list_lock
);
129 while (!list_empty(&mdsc
->caps_list
)) {
130 cap
= list_first_entry(&mdsc
->caps_list
,
131 struct ceph_cap
, caps_item
);
132 list_del(&cap
->caps_item
);
133 kmem_cache_free(ceph_cap_cachep
, cap
);
135 mdsc
->caps_total_count
= 0;
136 mdsc
->caps_avail_count
= 0;
137 mdsc
->caps_use_count
= 0;
138 mdsc
->caps_reserve_count
= 0;
139 mdsc
->caps_min_count
= 0;
140 spin_unlock(&mdsc
->caps_list_lock
);
143 void ceph_adjust_min_caps(struct ceph_mds_client
*mdsc
, int delta
)
145 spin_lock(&mdsc
->caps_list_lock
);
146 mdsc
->caps_min_count
+= delta
;
147 BUG_ON(mdsc
->caps_min_count
< 0);
148 spin_unlock(&mdsc
->caps_list_lock
);
151 void ceph_reserve_caps(struct ceph_mds_client
*mdsc
,
152 struct ceph_cap_reservation
*ctx
, int need
)
155 struct ceph_cap
*cap
;
160 dout("reserve caps ctx=%p need=%d\n", ctx
, need
);
162 /* first reserve any caps that are already allocated */
163 spin_lock(&mdsc
->caps_list_lock
);
164 if (mdsc
->caps_avail_count
>= need
)
167 have
= mdsc
->caps_avail_count
;
168 mdsc
->caps_avail_count
-= have
;
169 mdsc
->caps_reserve_count
+= have
;
170 BUG_ON(mdsc
->caps_total_count
!= mdsc
->caps_use_count
+
171 mdsc
->caps_reserve_count
+
172 mdsc
->caps_avail_count
);
173 spin_unlock(&mdsc
->caps_list_lock
);
175 for (i
= have
; i
< need
; i
++) {
176 cap
= kmem_cache_alloc(ceph_cap_cachep
, GFP_NOFS
);
179 list_add(&cap
->caps_item
, &newcaps
);
182 /* we didn't manage to reserve as much as we needed */
183 if (have
+ alloc
!= need
)
184 pr_warn("reserve caps ctx=%p ENOMEM need=%d got=%d\n",
185 ctx
, need
, have
+ alloc
);
187 spin_lock(&mdsc
->caps_list_lock
);
188 mdsc
->caps_total_count
+= alloc
;
189 mdsc
->caps_reserve_count
+= alloc
;
190 list_splice(&newcaps
, &mdsc
->caps_list
);
192 BUG_ON(mdsc
->caps_total_count
!= mdsc
->caps_use_count
+
193 mdsc
->caps_reserve_count
+
194 mdsc
->caps_avail_count
);
195 spin_unlock(&mdsc
->caps_list_lock
);
198 dout("reserve caps ctx=%p %d = %d used + %d resv + %d avail\n",
199 ctx
, mdsc
->caps_total_count
, mdsc
->caps_use_count
,
200 mdsc
->caps_reserve_count
, mdsc
->caps_avail_count
);
203 int ceph_unreserve_caps(struct ceph_mds_client
*mdsc
,
204 struct ceph_cap_reservation
*ctx
)
206 dout("unreserve caps ctx=%p count=%d\n", ctx
, ctx
->count
);
208 spin_lock(&mdsc
->caps_list_lock
);
209 BUG_ON(mdsc
->caps_reserve_count
< ctx
->count
);
210 mdsc
->caps_reserve_count
-= ctx
->count
;
211 mdsc
->caps_avail_count
+= ctx
->count
;
213 dout("unreserve caps %d = %d used + %d resv + %d avail\n",
214 mdsc
->caps_total_count
, mdsc
->caps_use_count
,
215 mdsc
->caps_reserve_count
, mdsc
->caps_avail_count
);
216 BUG_ON(mdsc
->caps_total_count
!= mdsc
->caps_use_count
+
217 mdsc
->caps_reserve_count
+
218 mdsc
->caps_avail_count
);
219 spin_unlock(&mdsc
->caps_list_lock
);
224 struct ceph_cap
*ceph_get_cap(struct ceph_mds_client
*mdsc
,
225 struct ceph_cap_reservation
*ctx
)
227 struct ceph_cap
*cap
= NULL
;
229 /* temporary, until we do something about cap import/export */
231 cap
= kmem_cache_alloc(ceph_cap_cachep
, GFP_NOFS
);
233 spin_lock(&mdsc
->caps_list_lock
);
234 mdsc
->caps_use_count
++;
235 mdsc
->caps_total_count
++;
236 spin_unlock(&mdsc
->caps_list_lock
);
241 spin_lock(&mdsc
->caps_list_lock
);
242 dout("get_cap ctx=%p (%d) %d = %d used + %d resv + %d avail\n",
243 ctx
, ctx
->count
, mdsc
->caps_total_count
, mdsc
->caps_use_count
,
244 mdsc
->caps_reserve_count
, mdsc
->caps_avail_count
);
246 BUG_ON(ctx
->count
> mdsc
->caps_reserve_count
);
247 BUG_ON(list_empty(&mdsc
->caps_list
));
250 mdsc
->caps_reserve_count
--;
251 mdsc
->caps_use_count
++;
253 cap
= list_first_entry(&mdsc
->caps_list
, struct ceph_cap
, caps_item
);
254 list_del(&cap
->caps_item
);
256 BUG_ON(mdsc
->caps_total_count
!= mdsc
->caps_use_count
+
257 mdsc
->caps_reserve_count
+ mdsc
->caps_avail_count
);
258 spin_unlock(&mdsc
->caps_list_lock
);
262 void ceph_put_cap(struct ceph_mds_client
*mdsc
, struct ceph_cap
*cap
)
264 spin_lock(&mdsc
->caps_list_lock
);
265 dout("put_cap %p %d = %d used + %d resv + %d avail\n",
266 cap
, mdsc
->caps_total_count
, mdsc
->caps_use_count
,
267 mdsc
->caps_reserve_count
, mdsc
->caps_avail_count
);
268 mdsc
->caps_use_count
--;
270 * Keep some preallocated caps around (ceph_min_count), to
271 * avoid lots of free/alloc churn.
273 if (mdsc
->caps_avail_count
>= mdsc
->caps_reserve_count
+
274 mdsc
->caps_min_count
) {
275 mdsc
->caps_total_count
--;
276 kmem_cache_free(ceph_cap_cachep
, cap
);
278 mdsc
->caps_avail_count
++;
279 list_add(&cap
->caps_item
, &mdsc
->caps_list
);
282 BUG_ON(mdsc
->caps_total_count
!= mdsc
->caps_use_count
+
283 mdsc
->caps_reserve_count
+ mdsc
->caps_avail_count
);
284 spin_unlock(&mdsc
->caps_list_lock
);
287 void ceph_reservation_status(struct ceph_fs_client
*fsc
,
288 int *total
, int *avail
, int *used
, int *reserved
,
291 struct ceph_mds_client
*mdsc
= fsc
->mdsc
;
294 *total
= mdsc
->caps_total_count
;
296 *avail
= mdsc
->caps_avail_count
;
298 *used
= mdsc
->caps_use_count
;
300 *reserved
= mdsc
->caps_reserve_count
;
302 *min
= mdsc
->caps_min_count
;
306 * Find ceph_cap for given mds, if any.
308 * Called with i_ceph_lock held.
310 static struct ceph_cap
*__get_cap_for_mds(struct ceph_inode_info
*ci
, int mds
)
312 struct ceph_cap
*cap
;
313 struct rb_node
*n
= ci
->i_caps
.rb_node
;
316 cap
= rb_entry(n
, struct ceph_cap
, ci_node
);
319 else if (mds
> cap
->mds
)
327 struct ceph_cap
*ceph_get_cap_for_mds(struct ceph_inode_info
*ci
, int mds
)
329 struct ceph_cap
*cap
;
331 spin_lock(&ci
->i_ceph_lock
);
332 cap
= __get_cap_for_mds(ci
, mds
);
333 spin_unlock(&ci
->i_ceph_lock
);
338 * Return id of any MDS with a cap, preferably FILE_WR|BUFFER|EXCL, else -1.
340 static int __ceph_get_cap_mds(struct ceph_inode_info
*ci
)
342 struct ceph_cap
*cap
;
346 /* prefer mds with WR|BUFFER|EXCL caps */
347 for (p
= rb_first(&ci
->i_caps
); p
; p
= rb_next(p
)) {
348 cap
= rb_entry(p
, struct ceph_cap
, ci_node
);
350 if (cap
->issued
& (CEPH_CAP_FILE_WR
|
351 CEPH_CAP_FILE_BUFFER
|
358 int ceph_get_cap_mds(struct inode
*inode
)
360 struct ceph_inode_info
*ci
= ceph_inode(inode
);
362 spin_lock(&ci
->i_ceph_lock
);
363 mds
= __ceph_get_cap_mds(ceph_inode(inode
));
364 spin_unlock(&ci
->i_ceph_lock
);
369 * Called under i_ceph_lock.
371 static void __insert_cap_node(struct ceph_inode_info
*ci
,
372 struct ceph_cap
*new)
374 struct rb_node
**p
= &ci
->i_caps
.rb_node
;
375 struct rb_node
*parent
= NULL
;
376 struct ceph_cap
*cap
= NULL
;
380 cap
= rb_entry(parent
, struct ceph_cap
, ci_node
);
381 if (new->mds
< cap
->mds
)
383 else if (new->mds
> cap
->mds
)
389 rb_link_node(&new->ci_node
, parent
, p
);
390 rb_insert_color(&new->ci_node
, &ci
->i_caps
);
394 * (re)set cap hold timeouts, which control the delayed release
395 * of unused caps back to the MDS. Should be called on cap use.
397 static void __cap_set_timeouts(struct ceph_mds_client
*mdsc
,
398 struct ceph_inode_info
*ci
)
400 struct ceph_mount_options
*ma
= mdsc
->fsc
->mount_options
;
402 ci
->i_hold_caps_min
= round_jiffies(jiffies
+
403 ma
->caps_wanted_delay_min
* HZ
);
404 ci
->i_hold_caps_max
= round_jiffies(jiffies
+
405 ma
->caps_wanted_delay_max
* HZ
);
406 dout("__cap_set_timeouts %p min %lu max %lu\n", &ci
->vfs_inode
,
407 ci
->i_hold_caps_min
- jiffies
, ci
->i_hold_caps_max
- jiffies
);
411 * (Re)queue cap at the end of the delayed cap release list.
413 * If I_FLUSH is set, leave the inode at the front of the list.
415 * Caller holds i_ceph_lock
416 * -> we take mdsc->cap_delay_lock
418 static void __cap_delay_requeue(struct ceph_mds_client
*mdsc
,
419 struct ceph_inode_info
*ci
)
421 __cap_set_timeouts(mdsc
, ci
);
422 dout("__cap_delay_requeue %p flags %d at %lu\n", &ci
->vfs_inode
,
423 ci
->i_ceph_flags
, ci
->i_hold_caps_max
);
424 if (!mdsc
->stopping
) {
425 spin_lock(&mdsc
->cap_delay_lock
);
426 if (!list_empty(&ci
->i_cap_delay_list
)) {
427 if (ci
->i_ceph_flags
& CEPH_I_FLUSH
)
429 list_del_init(&ci
->i_cap_delay_list
);
431 list_add_tail(&ci
->i_cap_delay_list
, &mdsc
->cap_delay_list
);
433 spin_unlock(&mdsc
->cap_delay_lock
);
438 * Queue an inode for immediate writeback. Mark inode with I_FLUSH,
439 * indicating we should send a cap message to flush dirty metadata
440 * asap, and move to the front of the delayed cap list.
442 static void __cap_delay_requeue_front(struct ceph_mds_client
*mdsc
,
443 struct ceph_inode_info
*ci
)
445 dout("__cap_delay_requeue_front %p\n", &ci
->vfs_inode
);
446 spin_lock(&mdsc
->cap_delay_lock
);
447 ci
->i_ceph_flags
|= CEPH_I_FLUSH
;
448 if (!list_empty(&ci
->i_cap_delay_list
))
449 list_del_init(&ci
->i_cap_delay_list
);
450 list_add(&ci
->i_cap_delay_list
, &mdsc
->cap_delay_list
);
451 spin_unlock(&mdsc
->cap_delay_lock
);
455 * Cancel delayed work on cap.
457 * Caller must hold i_ceph_lock.
459 static void __cap_delay_cancel(struct ceph_mds_client
*mdsc
,
460 struct ceph_inode_info
*ci
)
462 dout("__cap_delay_cancel %p\n", &ci
->vfs_inode
);
463 if (list_empty(&ci
->i_cap_delay_list
))
465 spin_lock(&mdsc
->cap_delay_lock
);
466 list_del_init(&ci
->i_cap_delay_list
);
467 spin_unlock(&mdsc
->cap_delay_lock
);
471 * Common issue checks for add_cap, handle_cap_grant.
473 static void __check_cap_issue(struct ceph_inode_info
*ci
, struct ceph_cap
*cap
,
476 unsigned had
= __ceph_caps_issued(ci
, NULL
);
479 * Each time we receive FILE_CACHE anew, we increment
482 if ((issued
& (CEPH_CAP_FILE_CACHE
|CEPH_CAP_FILE_LAZYIO
)) &&
483 (had
& (CEPH_CAP_FILE_CACHE
|CEPH_CAP_FILE_LAZYIO
)) == 0) {
488 * if we are newly issued FILE_SHARED, mark dir not complete; we
489 * don't know what happened to this directory while we didn't
492 if ((issued
& CEPH_CAP_FILE_SHARED
) &&
493 (had
& CEPH_CAP_FILE_SHARED
) == 0) {
495 if (S_ISDIR(ci
->vfs_inode
.i_mode
)) {
496 dout(" marking %p NOT complete\n", &ci
->vfs_inode
);
497 __ceph_dir_clear_complete(ci
);
503 * Add a capability under the given MDS session.
505 * Caller should hold session snap_rwsem (read) and s_mutex.
507 * @fmode is the open file mode, if we are opening a file, otherwise
508 * it is < 0. (This is so we can atomically add the cap and add an
509 * open file reference to it.)
511 void ceph_add_cap(struct inode
*inode
,
512 struct ceph_mds_session
*session
, u64 cap_id
,
513 int fmode
, unsigned issued
, unsigned wanted
,
514 unsigned seq
, unsigned mseq
, u64 realmino
, int flags
,
515 struct ceph_cap
**new_cap
)
517 struct ceph_mds_client
*mdsc
= ceph_inode_to_client(inode
)->mdsc
;
518 struct ceph_inode_info
*ci
= ceph_inode(inode
);
519 struct ceph_cap
*cap
;
520 int mds
= session
->s_mds
;
523 dout("add_cap %p mds%d cap %llx %s seq %d\n", inode
,
524 session
->s_mds
, cap_id
, ceph_cap_string(issued
), seq
);
527 * If we are opening the file, include file mode wanted bits
531 wanted
|= ceph_caps_for_mode(fmode
);
533 cap
= __get_cap_for_mds(ci
, mds
);
539 cap
->implemented
= 0;
545 __insert_cap_node(ci
, cap
);
547 /* add to session cap list */
548 cap
->session
= session
;
549 spin_lock(&session
->s_cap_lock
);
550 list_add_tail(&cap
->session_caps
, &session
->s_caps
);
551 session
->s_nr_caps
++;
552 spin_unlock(&session
->s_cap_lock
);
555 * auth mds of the inode changed. we received the cap export
556 * message, but still haven't received the cap import message.
557 * handle_cap_export() updated the new auth MDS' cap.
559 * "ceph_seq_cmp(seq, cap->seq) <= 0" means we are processing
560 * a message that was send before the cap import message. So
563 if (ceph_seq_cmp(seq
, cap
->seq
) <= 0) {
564 WARN_ON(cap
!= ci
->i_auth_cap
);
565 WARN_ON(cap
->cap_id
!= cap_id
);
568 issued
|= cap
->issued
;
569 flags
|= CEPH_CAP_FLAG_AUTH
;
573 if (!ci
->i_snap_realm
) {
575 * add this inode to the appropriate snap realm
577 struct ceph_snap_realm
*realm
= ceph_lookup_snap_realm(mdsc
,
580 spin_lock(&realm
->inodes_with_caps_lock
);
581 ci
->i_snap_realm
= realm
;
582 list_add(&ci
->i_snap_realm_item
,
583 &realm
->inodes_with_caps
);
584 spin_unlock(&realm
->inodes_with_caps_lock
);
586 pr_err("ceph_add_cap: couldn't find snap realm %llx\n",
592 __check_cap_issue(ci
, cap
, issued
);
595 * If we are issued caps we don't want, or the mds' wanted
596 * value appears to be off, queue a check so we'll release
597 * later and/or update the mds wanted value.
599 actual_wanted
= __ceph_caps_wanted(ci
);
600 if ((wanted
& ~actual_wanted
) ||
601 (issued
& ~actual_wanted
& CEPH_CAP_ANY_WR
)) {
602 dout(" issued %s, mds wanted %s, actual %s, queueing\n",
603 ceph_cap_string(issued
), ceph_cap_string(wanted
),
604 ceph_cap_string(actual_wanted
));
605 __cap_delay_requeue(mdsc
, ci
);
608 if (flags
& CEPH_CAP_FLAG_AUTH
) {
609 if (ci
->i_auth_cap
== NULL
||
610 ceph_seq_cmp(ci
->i_auth_cap
->mseq
, mseq
) < 0) {
611 ci
->i_auth_cap
= cap
;
612 cap
->mds_wanted
= wanted
;
615 WARN_ON(ci
->i_auth_cap
== cap
);
618 dout("add_cap inode %p (%llx.%llx) cap %p %s now %s seq %d mds%d\n",
619 inode
, ceph_vinop(inode
), cap
, ceph_cap_string(issued
),
620 ceph_cap_string(issued
|cap
->issued
), seq
, mds
);
621 cap
->cap_id
= cap_id
;
622 cap
->issued
= issued
;
623 cap
->implemented
|= issued
;
624 if (ceph_seq_cmp(mseq
, cap
->mseq
) > 0)
625 cap
->mds_wanted
= wanted
;
627 cap
->mds_wanted
|= wanted
;
629 cap
->issue_seq
= seq
;
631 cap
->cap_gen
= session
->s_cap_gen
;
634 __ceph_get_fmode(ci
, fmode
);
638 * Return true if cap has not timed out and belongs to the current
639 * generation of the MDS session (i.e. has not gone 'stale' due to
640 * us losing touch with the mds).
642 static int __cap_is_valid(struct ceph_cap
*cap
)
647 spin_lock(&cap
->session
->s_gen_ttl_lock
);
648 gen
= cap
->session
->s_cap_gen
;
649 ttl
= cap
->session
->s_cap_ttl
;
650 spin_unlock(&cap
->session
->s_gen_ttl_lock
);
652 if (cap
->cap_gen
< gen
|| time_after_eq(jiffies
, ttl
)) {
653 dout("__cap_is_valid %p cap %p issued %s "
654 "but STALE (gen %u vs %u)\n", &cap
->ci
->vfs_inode
,
655 cap
, ceph_cap_string(cap
->issued
), cap
->cap_gen
, gen
);
663 * Return set of valid cap bits issued to us. Note that caps time
664 * out, and may be invalidated in bulk if the client session times out
665 * and session->s_cap_gen is bumped.
667 int __ceph_caps_issued(struct ceph_inode_info
*ci
, int *implemented
)
669 int have
= ci
->i_snap_caps
;
670 struct ceph_cap
*cap
;
675 for (p
= rb_first(&ci
->i_caps
); p
; p
= rb_next(p
)) {
676 cap
= rb_entry(p
, struct ceph_cap
, ci_node
);
677 if (!__cap_is_valid(cap
))
679 dout("__ceph_caps_issued %p cap %p issued %s\n",
680 &ci
->vfs_inode
, cap
, ceph_cap_string(cap
->issued
));
683 *implemented
|= cap
->implemented
;
686 * exclude caps issued by non-auth MDS, but are been revoking
687 * by the auth MDS. The non-auth MDS should be revoking/exporting
688 * these caps, but the message is delayed.
690 if (ci
->i_auth_cap
) {
691 cap
= ci
->i_auth_cap
;
692 have
&= ~cap
->implemented
| cap
->issued
;
698 * Get cap bits issued by caps other than @ocap
700 int __ceph_caps_issued_other(struct ceph_inode_info
*ci
, struct ceph_cap
*ocap
)
702 int have
= ci
->i_snap_caps
;
703 struct ceph_cap
*cap
;
706 for (p
= rb_first(&ci
->i_caps
); p
; p
= rb_next(p
)) {
707 cap
= rb_entry(p
, struct ceph_cap
, ci_node
);
710 if (!__cap_is_valid(cap
))
718 * Move a cap to the end of the LRU (oldest caps at list head, newest
721 static void __touch_cap(struct ceph_cap
*cap
)
723 struct ceph_mds_session
*s
= cap
->session
;
725 spin_lock(&s
->s_cap_lock
);
726 if (s
->s_cap_iterator
== NULL
) {
727 dout("__touch_cap %p cap %p mds%d\n", &cap
->ci
->vfs_inode
, cap
,
729 list_move_tail(&cap
->session_caps
, &s
->s_caps
);
731 dout("__touch_cap %p cap %p mds%d NOP, iterating over caps\n",
732 &cap
->ci
->vfs_inode
, cap
, s
->s_mds
);
734 spin_unlock(&s
->s_cap_lock
);
738 * Check if we hold the given mask. If so, move the cap(s) to the
739 * front of their respective LRUs. (This is the preferred way for
740 * callers to check for caps they want.)
742 int __ceph_caps_issued_mask(struct ceph_inode_info
*ci
, int mask
, int touch
)
744 struct ceph_cap
*cap
;
746 int have
= ci
->i_snap_caps
;
748 if ((have
& mask
) == mask
) {
749 dout("__ceph_caps_issued_mask %p snap issued %s"
750 " (mask %s)\n", &ci
->vfs_inode
,
751 ceph_cap_string(have
),
752 ceph_cap_string(mask
));
756 for (p
= rb_first(&ci
->i_caps
); p
; p
= rb_next(p
)) {
757 cap
= rb_entry(p
, struct ceph_cap
, ci_node
);
758 if (!__cap_is_valid(cap
))
760 if ((cap
->issued
& mask
) == mask
) {
761 dout("__ceph_caps_issued_mask %p cap %p issued %s"
762 " (mask %s)\n", &ci
->vfs_inode
, cap
,
763 ceph_cap_string(cap
->issued
),
764 ceph_cap_string(mask
));
770 /* does a combination of caps satisfy mask? */
772 if ((have
& mask
) == mask
) {
773 dout("__ceph_caps_issued_mask %p combo issued %s"
774 " (mask %s)\n", &ci
->vfs_inode
,
775 ceph_cap_string(cap
->issued
),
776 ceph_cap_string(mask
));
780 /* touch this + preceding caps */
782 for (q
= rb_first(&ci
->i_caps
); q
!= p
;
784 cap
= rb_entry(q
, struct ceph_cap
,
786 if (!__cap_is_valid(cap
))
799 * Return true if mask caps are currently being revoked by an MDS.
801 int __ceph_caps_revoking_other(struct ceph_inode_info
*ci
,
802 struct ceph_cap
*ocap
, int mask
)
804 struct ceph_cap
*cap
;
807 for (p
= rb_first(&ci
->i_caps
); p
; p
= rb_next(p
)) {
808 cap
= rb_entry(p
, struct ceph_cap
, ci_node
);
810 (cap
->implemented
& ~cap
->issued
& mask
))
816 int ceph_caps_revoking(struct ceph_inode_info
*ci
, int mask
)
818 struct inode
*inode
= &ci
->vfs_inode
;
821 spin_lock(&ci
->i_ceph_lock
);
822 ret
= __ceph_caps_revoking_other(ci
, NULL
, mask
);
823 spin_unlock(&ci
->i_ceph_lock
);
824 dout("ceph_caps_revoking %p %s = %d\n", inode
,
825 ceph_cap_string(mask
), ret
);
829 int __ceph_caps_used(struct ceph_inode_info
*ci
)
833 used
|= CEPH_CAP_PIN
;
835 used
|= CEPH_CAP_FILE_RD
;
836 if (ci
->i_rdcache_ref
||
837 (!S_ISDIR(ci
->vfs_inode
.i_mode
) && /* ignore readdir cache */
838 ci
->vfs_inode
.i_data
.nrpages
))
839 used
|= CEPH_CAP_FILE_CACHE
;
841 used
|= CEPH_CAP_FILE_WR
;
842 if (ci
->i_wb_ref
|| ci
->i_wrbuffer_ref
)
843 used
|= CEPH_CAP_FILE_BUFFER
;
848 * wanted, by virtue of open file modes
850 int __ceph_caps_file_wanted(struct ceph_inode_info
*ci
)
854 for (mode
= 0; mode
< CEPH_FILE_MODE_NUM
; mode
++)
855 if (ci
->i_nr_by_mode
[mode
])
856 want
|= ceph_caps_for_mode(mode
);
861 * Return caps we have registered with the MDS(s) as 'wanted'.
863 int __ceph_caps_mds_wanted(struct ceph_inode_info
*ci
)
865 struct ceph_cap
*cap
;
869 for (p
= rb_first(&ci
->i_caps
); p
; p
= rb_next(p
)) {
870 cap
= rb_entry(p
, struct ceph_cap
, ci_node
);
871 if (!__cap_is_valid(cap
))
873 if (cap
== ci
->i_auth_cap
)
874 mds_wanted
|= cap
->mds_wanted
;
876 mds_wanted
|= (cap
->mds_wanted
& ~CEPH_CAP_ANY_FILE_WR
);
882 * called under i_ceph_lock
884 static int __ceph_is_any_caps(struct ceph_inode_info
*ci
)
886 return !RB_EMPTY_ROOT(&ci
->i_caps
);
889 int ceph_is_any_caps(struct inode
*inode
)
891 struct ceph_inode_info
*ci
= ceph_inode(inode
);
894 spin_lock(&ci
->i_ceph_lock
);
895 ret
= __ceph_is_any_caps(ci
);
896 spin_unlock(&ci
->i_ceph_lock
);
901 static void drop_inode_snap_realm(struct ceph_inode_info
*ci
)
903 struct ceph_snap_realm
*realm
= ci
->i_snap_realm
;
904 spin_lock(&realm
->inodes_with_caps_lock
);
905 list_del_init(&ci
->i_snap_realm_item
);
906 ci
->i_snap_realm_counter
++;
907 ci
->i_snap_realm
= NULL
;
908 spin_unlock(&realm
->inodes_with_caps_lock
);
909 ceph_put_snap_realm(ceph_sb_to_client(ci
->vfs_inode
.i_sb
)->mdsc
,
914 * Remove a cap. Take steps to deal with a racing iterate_session_caps.
916 * caller should hold i_ceph_lock.
917 * caller will not hold session s_mutex if called from destroy_inode.
919 void __ceph_remove_cap(struct ceph_cap
*cap
, bool queue_release
)
921 struct ceph_mds_session
*session
= cap
->session
;
922 struct ceph_inode_info
*ci
= cap
->ci
;
923 struct ceph_mds_client
*mdsc
=
924 ceph_sb_to_client(ci
->vfs_inode
.i_sb
)->mdsc
;
927 dout("__ceph_remove_cap %p from %p\n", cap
, &ci
->vfs_inode
);
929 /* remove from session list */
930 spin_lock(&session
->s_cap_lock
);
931 if (session
->s_cap_iterator
== cap
) {
932 /* not yet, we are iterating over this very cap */
933 dout("__ceph_remove_cap delaying %p removal from session %p\n",
936 list_del_init(&cap
->session_caps
);
937 session
->s_nr_caps
--;
941 /* protect backpointer with s_cap_lock: see iterate_session_caps */
945 * s_cap_reconnect is protected by s_cap_lock. no one changes
946 * s_cap_gen while session is in the reconnect state.
949 (!session
->s_cap_reconnect
|| cap
->cap_gen
== session
->s_cap_gen
)) {
950 cap
->queue_release
= 1;
952 list_add_tail(&cap
->session_caps
,
953 &session
->s_cap_releases
);
954 session
->s_num_cap_releases
++;
958 cap
->queue_release
= 0;
960 cap
->cap_ino
= ci
->i_vino
.ino
;
962 spin_unlock(&session
->s_cap_lock
);
964 /* remove from inode list */
965 rb_erase(&cap
->ci_node
, &ci
->i_caps
);
966 if (ci
->i_auth_cap
== cap
)
967 ci
->i_auth_cap
= NULL
;
970 ceph_put_cap(mdsc
, cap
);
972 /* when reconnect denied, we remove session caps forcibly,
973 * i_wr_ref can be non-zero. If there are ongoing write,
976 if (!__ceph_is_any_caps(ci
) && ci
->i_wr_ref
== 0 && ci
->i_snap_realm
)
977 drop_inode_snap_realm(ci
);
979 if (!__ceph_is_any_real_caps(ci
))
980 __cap_delay_cancel(mdsc
, ci
);
984 * Build and send a cap message to the given MDS.
986 * Caller should be holding s_mutex.
988 static int send_cap_msg(struct ceph_mds_session
*session
,
989 u64 ino
, u64 cid
, int op
,
990 int caps
, int wanted
, int dirty
,
991 u32 seq
, u64 flush_tid
, u64 oldest_flush_tid
,
992 u32 issue_seq
, u32 mseq
, u64 size
, u64 max_size
,
993 struct timespec
*mtime
, struct timespec
*atime
,
994 struct timespec
*ctime
, u64 time_warp_seq
,
995 kuid_t uid
, kgid_t gid
, umode_t mode
,
997 struct ceph_buffer
*xattrs_buf
,
998 u64 follows
, bool inline_data
)
1000 struct ceph_mds_caps
*fc
;
1001 struct ceph_msg
*msg
;
1005 dout("send_cap_msg %s %llx %llx caps %s wanted %s dirty %s"
1006 " seq %u/%u tid %llu/%llu mseq %u follows %lld size %llu/%llu"
1007 " xattr_ver %llu xattr_len %d\n", ceph_cap_op_name(op
),
1008 cid
, ino
, ceph_cap_string(caps
), ceph_cap_string(wanted
),
1009 ceph_cap_string(dirty
),
1010 seq
, issue_seq
, flush_tid
, oldest_flush_tid
,
1011 mseq
, follows
, size
, max_size
,
1012 xattr_version
, xattrs_buf
? (int)xattrs_buf
->vec
.iov_len
: 0);
1014 /* flock buffer size + inline version + inline data size +
1015 * osd_epoch_barrier + oldest_flush_tid */
1016 extra_len
= 4 + 8 + 4 + 4 + 8;
1017 msg
= ceph_msg_new(CEPH_MSG_CLIENT_CAPS
, sizeof(*fc
) + extra_len
,
1022 msg
->hdr
.version
= cpu_to_le16(6);
1023 msg
->hdr
.tid
= cpu_to_le64(flush_tid
);
1025 fc
= msg
->front
.iov_base
;
1026 memset(fc
, 0, sizeof(*fc
));
1028 fc
->cap_id
= cpu_to_le64(cid
);
1029 fc
->op
= cpu_to_le32(op
);
1030 fc
->seq
= cpu_to_le32(seq
);
1031 fc
->issue_seq
= cpu_to_le32(issue_seq
);
1032 fc
->migrate_seq
= cpu_to_le32(mseq
);
1033 fc
->caps
= cpu_to_le32(caps
);
1034 fc
->wanted
= cpu_to_le32(wanted
);
1035 fc
->dirty
= cpu_to_le32(dirty
);
1036 fc
->ino
= cpu_to_le64(ino
);
1037 fc
->snap_follows
= cpu_to_le64(follows
);
1039 fc
->size
= cpu_to_le64(size
);
1040 fc
->max_size
= cpu_to_le64(max_size
);
1042 ceph_encode_timespec(&fc
->mtime
, mtime
);
1044 ceph_encode_timespec(&fc
->atime
, atime
);
1046 ceph_encode_timespec(&fc
->ctime
, ctime
);
1047 fc
->time_warp_seq
= cpu_to_le32(time_warp_seq
);
1049 fc
->uid
= cpu_to_le32(from_kuid(&init_user_ns
, uid
));
1050 fc
->gid
= cpu_to_le32(from_kgid(&init_user_ns
, gid
));
1051 fc
->mode
= cpu_to_le32(mode
);
1054 /* flock buffer size */
1055 ceph_encode_32(&p
, 0);
1056 /* inline version */
1057 ceph_encode_64(&p
, inline_data
? 0 : CEPH_INLINE_NONE
);
1058 /* inline data size */
1059 ceph_encode_32(&p
, 0);
1060 /* osd_epoch_barrier */
1061 ceph_encode_32(&p
, 0);
1062 /* oldest_flush_tid */
1063 ceph_encode_64(&p
, oldest_flush_tid
);
1065 fc
->xattr_version
= cpu_to_le64(xattr_version
);
1067 msg
->middle
= ceph_buffer_get(xattrs_buf
);
1068 fc
->xattr_len
= cpu_to_le32(xattrs_buf
->vec
.iov_len
);
1069 msg
->hdr
.middle_len
= cpu_to_le32(xattrs_buf
->vec
.iov_len
);
1072 ceph_con_send(&session
->s_con
, msg
);
1077 * Queue cap releases when an inode is dropped from our cache. Since
1078 * inode is about to be destroyed, there is no need for i_ceph_lock.
1080 void ceph_queue_caps_release(struct inode
*inode
)
1082 struct ceph_inode_info
*ci
= ceph_inode(inode
);
1085 p
= rb_first(&ci
->i_caps
);
1087 struct ceph_cap
*cap
= rb_entry(p
, struct ceph_cap
, ci_node
);
1089 __ceph_remove_cap(cap
, true);
1094 * Send a cap msg on the given inode. Update our caps state, then
1095 * drop i_ceph_lock and send the message.
1097 * Make note of max_size reported/requested from mds, revoked caps
1098 * that have now been implemented.
1100 * Make half-hearted attempt ot to invalidate page cache if we are
1101 * dropping RDCACHE. Note that this will leave behind locked pages
1102 * that we'll then need to deal with elsewhere.
1104 * Return non-zero if delayed release, or we experienced an error
1105 * such that the caller should requeue + retry later.
1107 * called with i_ceph_lock, then drops it.
1108 * caller should hold snap_rwsem (read), s_mutex.
1110 static int __send_cap(struct ceph_mds_client
*mdsc
, struct ceph_cap
*cap
,
1111 int op
, int used
, int want
, int retain
, int flushing
,
1112 u64 flush_tid
, u64 oldest_flush_tid
)
1113 __releases(cap
->ci
->i_ceph_lock
)
1115 struct ceph_inode_info
*ci
= cap
->ci
;
1116 struct inode
*inode
= &ci
->vfs_inode
;
1117 u64 cap_id
= cap
->cap_id
;
1118 int held
, revoking
, dropping
, keep
;
1119 u64 seq
, issue_seq
, mseq
, time_warp_seq
, follows
;
1121 struct timespec mtime
, atime
, ctime
;
1126 struct ceph_mds_session
*session
;
1127 u64 xattr_version
= 0;
1128 struct ceph_buffer
*xattr_blob
= NULL
;
1133 held
= cap
->issued
| cap
->implemented
;
1134 revoking
= cap
->implemented
& ~cap
->issued
;
1135 retain
&= ~revoking
;
1136 dropping
= cap
->issued
& ~retain
;
1138 dout("__send_cap %p cap %p session %p %s -> %s (revoking %s)\n",
1139 inode
, cap
, cap
->session
,
1140 ceph_cap_string(held
), ceph_cap_string(held
& retain
),
1141 ceph_cap_string(revoking
));
1142 BUG_ON((retain
& CEPH_CAP_PIN
) == 0);
1144 session
= cap
->session
;
1146 /* don't release wanted unless we've waited a bit. */
1147 if ((ci
->i_ceph_flags
& CEPH_I_NODELAY
) == 0 &&
1148 time_before(jiffies
, ci
->i_hold_caps_min
)) {
1149 dout(" delaying issued %s -> %s, wanted %s -> %s on send\n",
1150 ceph_cap_string(cap
->issued
),
1151 ceph_cap_string(cap
->issued
& retain
),
1152 ceph_cap_string(cap
->mds_wanted
),
1153 ceph_cap_string(want
));
1154 want
|= cap
->mds_wanted
;
1155 retain
|= cap
->issued
;
1158 ci
->i_ceph_flags
&= ~(CEPH_I_NODELAY
| CEPH_I_FLUSH
);
1160 cap
->issued
&= retain
; /* drop bits we don't want */
1161 if (cap
->implemented
& ~cap
->issued
) {
1163 * Wake up any waiters on wanted -> needed transition.
1164 * This is due to the weird transition from buffered
1165 * to sync IO... we need to flush dirty pages _before_
1166 * allowing sync writes to avoid reordering.
1170 cap
->implemented
&= cap
->issued
| used
;
1171 cap
->mds_wanted
= want
;
1173 follows
= flushing
? ci
->i_head_snapc
->seq
: 0;
1175 keep
= cap
->implemented
;
1177 issue_seq
= cap
->issue_seq
;
1179 size
= inode
->i_size
;
1180 ci
->i_reported_size
= size
;
1181 max_size
= ci
->i_wanted_max_size
;
1182 ci
->i_requested_max_size
= max_size
;
1183 mtime
= inode
->i_mtime
;
1184 atime
= inode
->i_atime
;
1185 ctime
= inode
->i_ctime
;
1186 time_warp_seq
= ci
->i_time_warp_seq
;
1189 mode
= inode
->i_mode
;
1191 if (flushing
& CEPH_CAP_XATTR_EXCL
) {
1192 __ceph_build_xattrs_blob(ci
);
1193 xattr_blob
= ci
->i_xattrs
.blob
;
1194 xattr_version
= ci
->i_xattrs
.version
;
1197 inline_data
= ci
->i_inline_version
!= CEPH_INLINE_NONE
;
1199 spin_unlock(&ci
->i_ceph_lock
);
1201 ret
= send_cap_msg(session
, ceph_vino(inode
).ino
, cap_id
,
1202 op
, keep
, want
, flushing
, seq
,
1203 flush_tid
, oldest_flush_tid
, issue_seq
, mseq
,
1204 size
, max_size
, &mtime
, &atime
, &ctime
, time_warp_seq
,
1205 uid
, gid
, mode
, xattr_version
, xattr_blob
,
1206 follows
, inline_data
);
1208 dout("error sending cap msg, must requeue %p\n", inode
);
1213 wake_up_all(&ci
->i_cap_wq
);
1219 * When a snapshot is taken, clients accumulate dirty metadata on
1220 * inodes with capabilities in ceph_cap_snaps to describe the file
1221 * state at the time the snapshot was taken. This must be flushed
1222 * asynchronously back to the MDS once sync writes complete and dirty
1223 * data is written out.
1225 * Unless @kick is true, skip cap_snaps that were already sent to
1226 * the MDS (i.e., during this session).
1228 * Called under i_ceph_lock. Takes s_mutex as needed.
1230 void __ceph_flush_snaps(struct ceph_inode_info
*ci
,
1231 struct ceph_mds_session
**psession
,
1233 __releases(ci
->i_ceph_lock
)
1234 __acquires(ci
->i_ceph_lock
)
1236 struct inode
*inode
= &ci
->vfs_inode
;
1238 struct ceph_cap_snap
*capsnap
;
1240 struct ceph_mds_client
*mdsc
= ceph_inode_to_client(inode
)->mdsc
;
1241 struct ceph_mds_session
*session
= NULL
; /* if session != NULL, we hold
1243 u64 next_follows
= 0; /* keep track of how far we've gotten through the
1244 i_cap_snaps list, and skip these entries next time
1245 around to avoid an infinite loop */
1248 session
= *psession
;
1250 dout("__flush_snaps %p\n", inode
);
1252 list_for_each_entry(capsnap
, &ci
->i_cap_snaps
, ci_item
) {
1253 /* avoid an infiniute loop after retry */
1254 if (capsnap
->follows
< next_follows
)
1257 * we need to wait for sync writes to complete and for dirty
1258 * pages to be written out.
1260 if (capsnap
->dirty_pages
|| capsnap
->writing
)
1263 /* should be removed by ceph_try_drop_cap_snap() */
1264 BUG_ON(!capsnap
->need_flush
);
1266 /* pick mds, take s_mutex */
1267 if (ci
->i_auth_cap
== NULL
) {
1268 dout("no auth cap (migrating?), doing nothing\n");
1272 /* only flush each capsnap once */
1273 if (!kick
&& !list_empty(&capsnap
->flushing_item
)) {
1274 dout("already flushed %p, skipping\n", capsnap
);
1278 mds
= ci
->i_auth_cap
->session
->s_mds
;
1279 mseq
= ci
->i_auth_cap
->mseq
;
1281 if (session
&& session
->s_mds
!= mds
) {
1282 dout("oops, wrong session %p mutex\n", session
);
1286 mutex_unlock(&session
->s_mutex
);
1287 ceph_put_mds_session(session
);
1291 spin_unlock(&ci
->i_ceph_lock
);
1292 mutex_lock(&mdsc
->mutex
);
1293 session
= __ceph_lookup_mds_session(mdsc
, mds
);
1294 mutex_unlock(&mdsc
->mutex
);
1296 dout("inverting session/ino locks on %p\n",
1298 mutex_lock(&session
->s_mutex
);
1301 * if session == NULL, we raced against a cap
1302 * deletion or migration. retry, and we'll
1303 * get a better @mds value next time.
1305 spin_lock(&ci
->i_ceph_lock
);
1309 spin_lock(&mdsc
->cap_dirty_lock
);
1310 capsnap
->flush_tid
= ++mdsc
->last_cap_flush_tid
;
1311 spin_unlock(&mdsc
->cap_dirty_lock
);
1313 atomic_inc(&capsnap
->nref
);
1314 if (list_empty(&capsnap
->flushing_item
))
1315 list_add_tail(&capsnap
->flushing_item
,
1316 &session
->s_cap_snaps_flushing
);
1317 spin_unlock(&ci
->i_ceph_lock
);
1319 dout("flush_snaps %p cap_snap %p follows %lld tid %llu\n",
1320 inode
, capsnap
, capsnap
->follows
, capsnap
->flush_tid
);
1321 send_cap_msg(session
, ceph_vino(inode
).ino
, 0,
1322 CEPH_CAP_OP_FLUSHSNAP
, capsnap
->issued
, 0,
1323 capsnap
->dirty
, 0, capsnap
->flush_tid
, 0,
1324 0, mseq
, capsnap
->size
, 0,
1325 &capsnap
->mtime
, &capsnap
->atime
,
1326 &capsnap
->ctime
, capsnap
->time_warp_seq
,
1327 capsnap
->uid
, capsnap
->gid
, capsnap
->mode
,
1328 capsnap
->xattr_version
, capsnap
->xattr_blob
,
1329 capsnap
->follows
, capsnap
->inline_data
);
1331 next_follows
= capsnap
->follows
+ 1;
1332 ceph_put_cap_snap(capsnap
);
1334 spin_lock(&ci
->i_ceph_lock
);
1338 /* we flushed them all; remove this inode from the queue */
1339 spin_lock(&mdsc
->snap_flush_lock
);
1340 list_del_init(&ci
->i_snap_flush_item
);
1341 spin_unlock(&mdsc
->snap_flush_lock
);
1345 *psession
= session
;
1347 mutex_unlock(&session
->s_mutex
);
1348 ceph_put_mds_session(session
);
1352 static void ceph_flush_snaps(struct ceph_inode_info
*ci
)
1354 spin_lock(&ci
->i_ceph_lock
);
1355 __ceph_flush_snaps(ci
, NULL
, 0);
1356 spin_unlock(&ci
->i_ceph_lock
);
1360 * Mark caps dirty. If inode is newly dirty, return the dirty flags.
1361 * Caller is then responsible for calling __mark_inode_dirty with the
1362 * returned flags value.
1364 int __ceph_mark_dirty_caps(struct ceph_inode_info
*ci
, int mask
,
1365 struct ceph_cap_flush
**pcf
)
1367 struct ceph_mds_client
*mdsc
=
1368 ceph_sb_to_client(ci
->vfs_inode
.i_sb
)->mdsc
;
1369 struct inode
*inode
= &ci
->vfs_inode
;
1370 int was
= ci
->i_dirty_caps
;
1373 if (!ci
->i_auth_cap
) {
1374 pr_warn("__mark_dirty_caps %p %llx mask %s, "
1375 "but no auth cap (session was closed?)\n",
1376 inode
, ceph_ino(inode
), ceph_cap_string(mask
));
1380 dout("__mark_dirty_caps %p %s dirty %s -> %s\n", &ci
->vfs_inode
,
1381 ceph_cap_string(mask
), ceph_cap_string(was
),
1382 ceph_cap_string(was
| mask
));
1383 ci
->i_dirty_caps
|= mask
;
1385 WARN_ON_ONCE(ci
->i_prealloc_cap_flush
);
1386 swap(ci
->i_prealloc_cap_flush
, *pcf
);
1388 if (!ci
->i_head_snapc
) {
1389 WARN_ON_ONCE(!rwsem_is_locked(&mdsc
->snap_rwsem
));
1390 ci
->i_head_snapc
= ceph_get_snap_context(
1391 ci
->i_snap_realm
->cached_context
);
1393 dout(" inode %p now dirty snapc %p auth cap %p\n",
1394 &ci
->vfs_inode
, ci
->i_head_snapc
, ci
->i_auth_cap
);
1395 BUG_ON(!list_empty(&ci
->i_dirty_item
));
1396 spin_lock(&mdsc
->cap_dirty_lock
);
1397 list_add(&ci
->i_dirty_item
, &mdsc
->cap_dirty
);
1398 spin_unlock(&mdsc
->cap_dirty_lock
);
1399 if (ci
->i_flushing_caps
== 0) {
1401 dirty
|= I_DIRTY_SYNC
;
1404 WARN_ON_ONCE(!ci
->i_prealloc_cap_flush
);
1406 BUG_ON(list_empty(&ci
->i_dirty_item
));
1407 if (((was
| ci
->i_flushing_caps
) & CEPH_CAP_FILE_BUFFER
) &&
1408 (mask
& CEPH_CAP_FILE_BUFFER
))
1409 dirty
|= I_DIRTY_DATASYNC
;
1410 __cap_delay_requeue(mdsc
, ci
);
1414 static void __add_cap_flushing_to_inode(struct ceph_inode_info
*ci
,
1415 struct ceph_cap_flush
*cf
)
1417 struct rb_node
**p
= &ci
->i_cap_flush_tree
.rb_node
;
1418 struct rb_node
*parent
= NULL
;
1419 struct ceph_cap_flush
*other
= NULL
;
1423 other
= rb_entry(parent
, struct ceph_cap_flush
, i_node
);
1425 if (cf
->tid
< other
->tid
)
1427 else if (cf
->tid
> other
->tid
)
1428 p
= &(*p
)->rb_right
;
1433 rb_link_node(&cf
->i_node
, parent
, p
);
1434 rb_insert_color(&cf
->i_node
, &ci
->i_cap_flush_tree
);
1437 static void __add_cap_flushing_to_mdsc(struct ceph_mds_client
*mdsc
,
1438 struct ceph_cap_flush
*cf
)
1440 struct rb_node
**p
= &mdsc
->cap_flush_tree
.rb_node
;
1441 struct rb_node
*parent
= NULL
;
1442 struct ceph_cap_flush
*other
= NULL
;
1446 other
= rb_entry(parent
, struct ceph_cap_flush
, g_node
);
1448 if (cf
->tid
< other
->tid
)
1450 else if (cf
->tid
> other
->tid
)
1451 p
= &(*p
)->rb_right
;
1456 rb_link_node(&cf
->g_node
, parent
, p
);
1457 rb_insert_color(&cf
->g_node
, &mdsc
->cap_flush_tree
);
1460 struct ceph_cap_flush
*ceph_alloc_cap_flush(void)
1462 return kmem_cache_alloc(ceph_cap_flush_cachep
, GFP_KERNEL
);
1465 void ceph_free_cap_flush(struct ceph_cap_flush
*cf
)
1468 kmem_cache_free(ceph_cap_flush_cachep
, cf
);
1471 static u64
__get_oldest_flush_tid(struct ceph_mds_client
*mdsc
)
1473 struct rb_node
*n
= rb_first(&mdsc
->cap_flush_tree
);
1475 struct ceph_cap_flush
*cf
=
1476 rb_entry(n
, struct ceph_cap_flush
, g_node
);
1483 * Add dirty inode to the flushing list. Assigned a seq number so we
1484 * can wait for caps to flush without starving.
1486 * Called under i_ceph_lock.
1488 static int __mark_caps_flushing(struct inode
*inode
,
1489 struct ceph_mds_session
*session
,
1490 u64
*flush_tid
, u64
*oldest_flush_tid
)
1492 struct ceph_mds_client
*mdsc
= ceph_sb_to_client(inode
->i_sb
)->mdsc
;
1493 struct ceph_inode_info
*ci
= ceph_inode(inode
);
1494 struct ceph_cap_flush
*cf
= NULL
;
1497 BUG_ON(ci
->i_dirty_caps
== 0);
1498 BUG_ON(list_empty(&ci
->i_dirty_item
));
1499 BUG_ON(!ci
->i_prealloc_cap_flush
);
1501 flushing
= ci
->i_dirty_caps
;
1502 dout("__mark_caps_flushing flushing %s, flushing_caps %s -> %s\n",
1503 ceph_cap_string(flushing
),
1504 ceph_cap_string(ci
->i_flushing_caps
),
1505 ceph_cap_string(ci
->i_flushing_caps
| flushing
));
1506 ci
->i_flushing_caps
|= flushing
;
1507 ci
->i_dirty_caps
= 0;
1508 dout(" inode %p now !dirty\n", inode
);
1510 swap(cf
, ci
->i_prealloc_cap_flush
);
1511 cf
->caps
= flushing
;
1513 spin_lock(&mdsc
->cap_dirty_lock
);
1514 list_del_init(&ci
->i_dirty_item
);
1516 cf
->tid
= ++mdsc
->last_cap_flush_tid
;
1517 __add_cap_flushing_to_mdsc(mdsc
, cf
);
1518 *oldest_flush_tid
= __get_oldest_flush_tid(mdsc
);
1520 if (list_empty(&ci
->i_flushing_item
)) {
1521 list_add_tail(&ci
->i_flushing_item
, &session
->s_cap_flushing
);
1522 mdsc
->num_cap_flushing
++;
1523 dout(" inode %p now flushing tid %llu\n", inode
, cf
->tid
);
1525 list_move_tail(&ci
->i_flushing_item
, &session
->s_cap_flushing
);
1526 dout(" inode %p now flushing (more) tid %llu\n",
1529 spin_unlock(&mdsc
->cap_dirty_lock
);
1531 __add_cap_flushing_to_inode(ci
, cf
);
1533 *flush_tid
= cf
->tid
;
1538 * try to invalidate mapping pages without blocking.
1540 static int try_nonblocking_invalidate(struct inode
*inode
)
1542 struct ceph_inode_info
*ci
= ceph_inode(inode
);
1543 u32 invalidating_gen
= ci
->i_rdcache_gen
;
1545 spin_unlock(&ci
->i_ceph_lock
);
1546 invalidate_mapping_pages(&inode
->i_data
, 0, -1);
1547 spin_lock(&ci
->i_ceph_lock
);
1549 if (inode
->i_data
.nrpages
== 0 &&
1550 invalidating_gen
== ci
->i_rdcache_gen
) {
1552 dout("try_nonblocking_invalidate %p success\n", inode
);
1553 /* save any racing async invalidate some trouble */
1554 ci
->i_rdcache_revoking
= ci
->i_rdcache_gen
- 1;
1557 dout("try_nonblocking_invalidate %p failed\n", inode
);
1562 * Swiss army knife function to examine currently used and wanted
1563 * versus held caps. Release, flush, ack revoked caps to mds as
1566 * CHECK_CAPS_NODELAY - caller is delayed work and we should not delay
1567 * cap release further.
1568 * CHECK_CAPS_AUTHONLY - we should only check the auth cap
1569 * CHECK_CAPS_FLUSH - we should flush any dirty caps immediately, without
1572 void ceph_check_caps(struct ceph_inode_info
*ci
, int flags
,
1573 struct ceph_mds_session
*session
)
1575 struct ceph_fs_client
*fsc
= ceph_inode_to_client(&ci
->vfs_inode
);
1576 struct ceph_mds_client
*mdsc
= fsc
->mdsc
;
1577 struct inode
*inode
= &ci
->vfs_inode
;
1578 struct ceph_cap
*cap
;
1579 u64 flush_tid
, oldest_flush_tid
;
1580 int file_wanted
, used
, cap_used
;
1581 int took_snap_rwsem
= 0; /* true if mdsc->snap_rwsem held */
1582 int issued
, implemented
, want
, retain
, revoking
, flushing
= 0;
1583 int mds
= -1; /* keep track of how far we've gone through i_caps list
1584 to avoid an infinite loop on retry */
1586 int tried_invalidate
= 0;
1587 int delayed
= 0, sent
= 0, force_requeue
= 0, num
;
1588 int queue_invalidate
= 0;
1589 int is_delayed
= flags
& CHECK_CAPS_NODELAY
;
1591 /* if we are unmounting, flush any unused caps immediately. */
1595 spin_lock(&ci
->i_ceph_lock
);
1597 if (ci
->i_ceph_flags
& CEPH_I_FLUSH
)
1598 flags
|= CHECK_CAPS_FLUSH
;
1600 /* flush snaps first time around only */
1601 if (!list_empty(&ci
->i_cap_snaps
))
1602 __ceph_flush_snaps(ci
, &session
, 0);
1605 spin_lock(&ci
->i_ceph_lock
);
1607 file_wanted
= __ceph_caps_file_wanted(ci
);
1608 used
= __ceph_caps_used(ci
);
1609 issued
= __ceph_caps_issued(ci
, &implemented
);
1610 revoking
= implemented
& ~issued
;
1613 retain
= file_wanted
| used
| CEPH_CAP_PIN
;
1614 if (!mdsc
->stopping
&& inode
->i_nlink
> 0) {
1616 retain
|= CEPH_CAP_ANY
; /* be greedy */
1617 } else if (S_ISDIR(inode
->i_mode
) &&
1618 (issued
& CEPH_CAP_FILE_SHARED
) &&
1619 __ceph_dir_is_complete(ci
)) {
1621 * If a directory is complete, we want to keep
1622 * the exclusive cap. So that MDS does not end up
1623 * revoking the shared cap on every create/unlink
1626 want
= CEPH_CAP_ANY_SHARED
| CEPH_CAP_FILE_EXCL
;
1630 retain
|= CEPH_CAP_ANY_SHARED
;
1632 * keep RD only if we didn't have the file open RW,
1633 * because then the mds would revoke it anyway to
1634 * journal max_size=0.
1636 if (ci
->i_max_size
== 0)
1637 retain
|= CEPH_CAP_ANY_RD
;
1641 dout("check_caps %p file_want %s used %s dirty %s flushing %s"
1642 " issued %s revoking %s retain %s %s%s%s\n", inode
,
1643 ceph_cap_string(file_wanted
),
1644 ceph_cap_string(used
), ceph_cap_string(ci
->i_dirty_caps
),
1645 ceph_cap_string(ci
->i_flushing_caps
),
1646 ceph_cap_string(issued
), ceph_cap_string(revoking
),
1647 ceph_cap_string(retain
),
1648 (flags
& CHECK_CAPS_AUTHONLY
) ? " AUTHONLY" : "",
1649 (flags
& CHECK_CAPS_NODELAY
) ? " NODELAY" : "",
1650 (flags
& CHECK_CAPS_FLUSH
) ? " FLUSH" : "");
1653 * If we no longer need to hold onto old our caps, and we may
1654 * have cached pages, but don't want them, then try to invalidate.
1655 * If we fail, it's because pages are locked.... try again later.
1657 if ((!is_delayed
|| mdsc
->stopping
) &&
1658 !S_ISDIR(inode
->i_mode
) && /* ignore readdir cache */
1659 !(ci
->i_wb_ref
|| ci
->i_wrbuffer_ref
) && /* no dirty pages... */
1660 inode
->i_data
.nrpages
&& /* have cached pages */
1661 (revoking
& (CEPH_CAP_FILE_CACHE
|
1662 CEPH_CAP_FILE_LAZYIO
)) && /* or revoking cache */
1663 !tried_invalidate
) {
1664 dout("check_caps trying to invalidate on %p\n", inode
);
1665 if (try_nonblocking_invalidate(inode
) < 0) {
1666 if (revoking
& (CEPH_CAP_FILE_CACHE
|
1667 CEPH_CAP_FILE_LAZYIO
)) {
1668 dout("check_caps queuing invalidate\n");
1669 queue_invalidate
= 1;
1670 ci
->i_rdcache_revoking
= ci
->i_rdcache_gen
;
1672 dout("check_caps failed to invalidate pages\n");
1673 /* we failed to invalidate pages. check these
1674 caps again later. */
1676 __cap_set_timeouts(mdsc
, ci
);
1679 tried_invalidate
= 1;
1684 for (p
= rb_first(&ci
->i_caps
); p
; p
= rb_next(p
)) {
1685 cap
= rb_entry(p
, struct ceph_cap
, ci_node
);
1688 /* avoid looping forever */
1689 if (mds
>= cap
->mds
||
1690 ((flags
& CHECK_CAPS_AUTHONLY
) && cap
!= ci
->i_auth_cap
))
1693 /* NOTE: no side-effects allowed, until we take s_mutex */
1696 if (ci
->i_auth_cap
&& cap
!= ci
->i_auth_cap
)
1697 cap_used
&= ~ci
->i_auth_cap
->issued
;
1699 revoking
= cap
->implemented
& ~cap
->issued
;
1700 dout(" mds%d cap %p used %s issued %s implemented %s revoking %s\n",
1701 cap
->mds
, cap
, ceph_cap_string(cap_used
),
1702 ceph_cap_string(cap
->issued
),
1703 ceph_cap_string(cap
->implemented
),
1704 ceph_cap_string(revoking
));
1706 if (cap
== ci
->i_auth_cap
&&
1707 (cap
->issued
& CEPH_CAP_FILE_WR
)) {
1708 /* request larger max_size from MDS? */
1709 if (ci
->i_wanted_max_size
> ci
->i_max_size
&&
1710 ci
->i_wanted_max_size
> ci
->i_requested_max_size
) {
1711 dout("requesting new max_size\n");
1715 /* approaching file_max? */
1716 if ((inode
->i_size
<< 1) >= ci
->i_max_size
&&
1717 (ci
->i_reported_size
<< 1) < ci
->i_max_size
) {
1718 dout("i_size approaching max_size\n");
1722 /* flush anything dirty? */
1723 if (cap
== ci
->i_auth_cap
&& (flags
& CHECK_CAPS_FLUSH
) &&
1725 dout("flushing dirty caps\n");
1729 /* completed revocation? going down and there are no caps? */
1730 if (revoking
&& (revoking
& cap_used
) == 0) {
1731 dout("completed revocation of %s\n",
1732 ceph_cap_string(cap
->implemented
& ~cap
->issued
));
1736 /* want more caps from mds? */
1737 if (want
& ~(cap
->mds_wanted
| cap
->issued
))
1740 /* things we might delay */
1741 if ((cap
->issued
& ~retain
) == 0 &&
1742 cap
->mds_wanted
== want
)
1743 continue; /* nope, all good */
1749 if ((ci
->i_ceph_flags
& CEPH_I_NODELAY
) == 0 &&
1750 time_before(jiffies
, ci
->i_hold_caps_max
)) {
1751 dout(" delaying issued %s -> %s, wanted %s -> %s\n",
1752 ceph_cap_string(cap
->issued
),
1753 ceph_cap_string(cap
->issued
& retain
),
1754 ceph_cap_string(cap
->mds_wanted
),
1755 ceph_cap_string(want
));
1761 if (ci
->i_ceph_flags
& CEPH_I_NOFLUSH
) {
1762 dout(" skipping %p I_NOFLUSH set\n", inode
);
1766 if (session
&& session
!= cap
->session
) {
1767 dout("oops, wrong session %p mutex\n", session
);
1768 mutex_unlock(&session
->s_mutex
);
1772 session
= cap
->session
;
1773 if (mutex_trylock(&session
->s_mutex
) == 0) {
1774 dout("inverting session/ino locks on %p\n",
1776 spin_unlock(&ci
->i_ceph_lock
);
1777 if (took_snap_rwsem
) {
1778 up_read(&mdsc
->snap_rwsem
);
1779 took_snap_rwsem
= 0;
1781 mutex_lock(&session
->s_mutex
);
1785 /* take snap_rwsem after session mutex */
1786 if (!took_snap_rwsem
) {
1787 if (down_read_trylock(&mdsc
->snap_rwsem
) == 0) {
1788 dout("inverting snap/in locks on %p\n",
1790 spin_unlock(&ci
->i_ceph_lock
);
1791 down_read(&mdsc
->snap_rwsem
);
1792 took_snap_rwsem
= 1;
1795 took_snap_rwsem
= 1;
1798 if (cap
== ci
->i_auth_cap
&& ci
->i_dirty_caps
) {
1799 flushing
= __mark_caps_flushing(inode
, session
,
1805 spin_lock(&mdsc
->cap_dirty_lock
);
1806 oldest_flush_tid
= __get_oldest_flush_tid(mdsc
);
1807 spin_unlock(&mdsc
->cap_dirty_lock
);
1810 mds
= cap
->mds
; /* remember mds, so we don't repeat */
1813 /* __send_cap drops i_ceph_lock */
1814 delayed
+= __send_cap(mdsc
, cap
, CEPH_CAP_OP_UPDATE
, cap_used
,
1815 want
, retain
, flushing
,
1816 flush_tid
, oldest_flush_tid
);
1817 goto retry
; /* retake i_ceph_lock and restart our cap scan. */
1821 * Reschedule delayed caps release if we delayed anything,
1824 if (delayed
&& is_delayed
)
1825 force_requeue
= 1; /* __send_cap delayed release; requeue */
1826 if (!delayed
&& !is_delayed
)
1827 __cap_delay_cancel(mdsc
, ci
);
1828 else if (!is_delayed
|| force_requeue
)
1829 __cap_delay_requeue(mdsc
, ci
);
1831 spin_unlock(&ci
->i_ceph_lock
);
1833 if (queue_invalidate
)
1834 ceph_queue_invalidate(inode
);
1837 mutex_unlock(&session
->s_mutex
);
1838 if (took_snap_rwsem
)
1839 up_read(&mdsc
->snap_rwsem
);
1843 * Try to flush dirty caps back to the auth mds.
1845 static int try_flush_caps(struct inode
*inode
, u64
*ptid
)
1847 struct ceph_mds_client
*mdsc
= ceph_sb_to_client(inode
->i_sb
)->mdsc
;
1848 struct ceph_inode_info
*ci
= ceph_inode(inode
);
1849 struct ceph_mds_session
*session
= NULL
;
1851 u64 flush_tid
= 0, oldest_flush_tid
= 0;
1854 spin_lock(&ci
->i_ceph_lock
);
1855 if (ci
->i_ceph_flags
& CEPH_I_NOFLUSH
) {
1856 dout("try_flush_caps skipping %p I_NOFLUSH set\n", inode
);
1859 if (ci
->i_dirty_caps
&& ci
->i_auth_cap
) {
1860 struct ceph_cap
*cap
= ci
->i_auth_cap
;
1861 int used
= __ceph_caps_used(ci
);
1862 int want
= __ceph_caps_wanted(ci
);
1865 if (!session
|| session
!= cap
->session
) {
1866 spin_unlock(&ci
->i_ceph_lock
);
1868 mutex_unlock(&session
->s_mutex
);
1869 session
= cap
->session
;
1870 mutex_lock(&session
->s_mutex
);
1873 if (cap
->session
->s_state
< CEPH_MDS_SESSION_OPEN
)
1876 flushing
= __mark_caps_flushing(inode
, session
, &flush_tid
,
1879 /* __send_cap drops i_ceph_lock */
1880 delayed
= __send_cap(mdsc
, cap
, CEPH_CAP_OP_FLUSH
, used
, want
,
1881 (cap
->issued
| cap
->implemented
),
1882 flushing
, flush_tid
, oldest_flush_tid
);
1885 spin_lock(&ci
->i_ceph_lock
);
1886 __cap_delay_requeue(mdsc
, ci
);
1887 spin_unlock(&ci
->i_ceph_lock
);
1890 struct rb_node
*n
= rb_last(&ci
->i_cap_flush_tree
);
1892 struct ceph_cap_flush
*cf
=
1893 rb_entry(n
, struct ceph_cap_flush
, i_node
);
1894 flush_tid
= cf
->tid
;
1896 flushing
= ci
->i_flushing_caps
;
1897 spin_unlock(&ci
->i_ceph_lock
);
1901 mutex_unlock(&session
->s_mutex
);
1908 * Return true if we've flushed caps through the given flush_tid.
1910 static int caps_are_flushed(struct inode
*inode
, u64 flush_tid
)
1912 struct ceph_inode_info
*ci
= ceph_inode(inode
);
1913 struct ceph_cap_flush
*cf
;
1917 spin_lock(&ci
->i_ceph_lock
);
1918 n
= rb_first(&ci
->i_cap_flush_tree
);
1920 cf
= rb_entry(n
, struct ceph_cap_flush
, i_node
);
1921 if (cf
->tid
<= flush_tid
)
1924 spin_unlock(&ci
->i_ceph_lock
);
1929 * Wait on any unsafe replies for the given inode. First wait on the
1930 * newest request, and make that the upper bound. Then, if there are
1931 * more requests, keep waiting on the oldest as long as it is still older
1932 * than the original request.
1934 static void sync_write_wait(struct inode
*inode
)
1936 struct ceph_inode_info
*ci
= ceph_inode(inode
);
1937 struct list_head
*head
= &ci
->i_unsafe_writes
;
1938 struct ceph_osd_request
*req
;
1941 if (!S_ISREG(inode
->i_mode
))
1944 spin_lock(&ci
->i_unsafe_lock
);
1945 if (list_empty(head
))
1948 /* set upper bound as _last_ entry in chain */
1949 req
= list_last_entry(head
, struct ceph_osd_request
,
1951 last_tid
= req
->r_tid
;
1954 ceph_osdc_get_request(req
);
1955 spin_unlock(&ci
->i_unsafe_lock
);
1956 dout("sync_write_wait on tid %llu (until %llu)\n",
1957 req
->r_tid
, last_tid
);
1958 wait_for_completion(&req
->r_safe_completion
);
1959 spin_lock(&ci
->i_unsafe_lock
);
1960 ceph_osdc_put_request(req
);
1963 * from here on look at first entry in chain, since we
1964 * only want to wait for anything older than last_tid
1966 if (list_empty(head
))
1968 req
= list_first_entry(head
, struct ceph_osd_request
,
1970 } while (req
->r_tid
< last_tid
);
1972 spin_unlock(&ci
->i_unsafe_lock
);
1976 * wait for any unsafe requests to complete.
1978 static int unsafe_request_wait(struct inode
*inode
)
1980 struct ceph_inode_info
*ci
= ceph_inode(inode
);
1981 struct ceph_mds_request
*req1
= NULL
, *req2
= NULL
;
1984 spin_lock(&ci
->i_unsafe_lock
);
1985 if (S_ISDIR(inode
->i_mode
) && !list_empty(&ci
->i_unsafe_dirops
)) {
1986 req1
= list_last_entry(&ci
->i_unsafe_dirops
,
1987 struct ceph_mds_request
,
1989 ceph_mdsc_get_request(req1
);
1991 if (!list_empty(&ci
->i_unsafe_iops
)) {
1992 req2
= list_last_entry(&ci
->i_unsafe_iops
,
1993 struct ceph_mds_request
,
1994 r_unsafe_target_item
);
1995 ceph_mdsc_get_request(req2
);
1997 spin_unlock(&ci
->i_unsafe_lock
);
1999 dout("unsafe_requeset_wait %p wait on tid %llu %llu\n",
2000 inode
, req1
? req1
->r_tid
: 0ULL, req2
? req2
->r_tid
: 0ULL);
2002 ret
= !wait_for_completion_timeout(&req1
->r_safe_completion
,
2003 ceph_timeout_jiffies(req1
->r_timeout
));
2006 ceph_mdsc_put_request(req1
);
2009 ret
= !wait_for_completion_timeout(&req2
->r_safe_completion
,
2010 ceph_timeout_jiffies(req2
->r_timeout
));
2013 ceph_mdsc_put_request(req2
);
2018 int ceph_fsync(struct file
*file
, loff_t start
, loff_t end
, int datasync
)
2020 struct inode
*inode
= file
->f_mapping
->host
;
2021 struct ceph_inode_info
*ci
= ceph_inode(inode
);
2026 dout("fsync %p%s\n", inode
, datasync
? " datasync" : "");
2027 sync_write_wait(inode
);
2029 ret
= filemap_write_and_wait_range(inode
->i_mapping
, start
, end
);
2038 dirty
= try_flush_caps(inode
, &flush_tid
);
2039 dout("fsync dirty caps are %s\n", ceph_cap_string(dirty
));
2041 ret
= unsafe_request_wait(inode
);
2044 * only wait on non-file metadata writeback (the mds
2045 * can recover size and mtime, so we don't need to
2048 if (!ret
&& (dirty
& ~CEPH_CAP_ANY_FILE_WR
)) {
2049 ret
= wait_event_interruptible(ci
->i_cap_wq
,
2050 caps_are_flushed(inode
, flush_tid
));
2052 inode_unlock(inode
);
2054 dout("fsync %p%s result=%d\n", inode
, datasync
? " datasync" : "", ret
);
2059 * Flush any dirty caps back to the mds. If we aren't asked to wait,
2060 * queue inode for flush but don't do so immediately, because we can
2061 * get by with fewer MDS messages if we wait for data writeback to
2064 int ceph_write_inode(struct inode
*inode
, struct writeback_control
*wbc
)
2066 struct ceph_inode_info
*ci
= ceph_inode(inode
);
2070 int wait
= wbc
->sync_mode
== WB_SYNC_ALL
;
2072 dout("write_inode %p wait=%d\n", inode
, wait
);
2074 dirty
= try_flush_caps(inode
, &flush_tid
);
2076 err
= wait_event_interruptible(ci
->i_cap_wq
,
2077 caps_are_flushed(inode
, flush_tid
));
2079 struct ceph_mds_client
*mdsc
=
2080 ceph_sb_to_client(inode
->i_sb
)->mdsc
;
2082 spin_lock(&ci
->i_ceph_lock
);
2083 if (__ceph_caps_dirty(ci
))
2084 __cap_delay_requeue_front(mdsc
, ci
);
2085 spin_unlock(&ci
->i_ceph_lock
);
2091 * After a recovering MDS goes active, we need to resend any caps
2094 * Caller holds session->s_mutex.
2096 static void kick_flushing_capsnaps(struct ceph_mds_client
*mdsc
,
2097 struct ceph_mds_session
*session
)
2099 struct ceph_cap_snap
*capsnap
;
2101 dout("kick_flushing_capsnaps mds%d\n", session
->s_mds
);
2102 list_for_each_entry(capsnap
, &session
->s_cap_snaps_flushing
,
2104 struct ceph_inode_info
*ci
= capsnap
->ci
;
2105 struct inode
*inode
= &ci
->vfs_inode
;
2106 struct ceph_cap
*cap
;
2108 spin_lock(&ci
->i_ceph_lock
);
2109 cap
= ci
->i_auth_cap
;
2110 if (cap
&& cap
->session
== session
) {
2111 dout("kick_flushing_caps %p cap %p capsnap %p\n", inode
,
2113 __ceph_flush_snaps(ci
, &session
, 1);
2115 pr_err("%p auth cap %p not mds%d ???\n", inode
,
2116 cap
, session
->s_mds
);
2118 spin_unlock(&ci
->i_ceph_lock
);
2122 static int __kick_flushing_caps(struct ceph_mds_client
*mdsc
,
2123 struct ceph_mds_session
*session
,
2124 struct ceph_inode_info
*ci
)
2126 struct inode
*inode
= &ci
->vfs_inode
;
2127 struct ceph_cap
*cap
;
2128 struct ceph_cap_flush
*cf
;
2132 u64 oldest_flush_tid
;
2134 spin_lock(&mdsc
->cap_dirty_lock
);
2135 oldest_flush_tid
= __get_oldest_flush_tid(mdsc
);
2136 spin_unlock(&mdsc
->cap_dirty_lock
);
2139 spin_lock(&ci
->i_ceph_lock
);
2140 cap
= ci
->i_auth_cap
;
2141 if (!(cap
&& cap
->session
== session
)) {
2142 pr_err("%p auth cap %p not mds%d ???\n", inode
,
2143 cap
, session
->s_mds
);
2144 spin_unlock(&ci
->i_ceph_lock
);
2148 for (n
= rb_first(&ci
->i_cap_flush_tree
); n
; n
= rb_next(n
)) {
2149 cf
= rb_entry(n
, struct ceph_cap_flush
, i_node
);
2150 if (cf
->tid
>= first_tid
)
2154 spin_unlock(&ci
->i_ceph_lock
);
2158 cf
= rb_entry(n
, struct ceph_cap_flush
, i_node
);
2160 first_tid
= cf
->tid
+ 1;
2162 dout("kick_flushing_caps %p cap %p tid %llu %s\n", inode
,
2163 cap
, cf
->tid
, ceph_cap_string(cf
->caps
));
2164 delayed
|= __send_cap(mdsc
, cap
, CEPH_CAP_OP_FLUSH
,
2165 __ceph_caps_used(ci
),
2166 __ceph_caps_wanted(ci
),
2167 cap
->issued
| cap
->implemented
,
2168 cf
->caps
, cf
->tid
, oldest_flush_tid
);
2173 void ceph_early_kick_flushing_caps(struct ceph_mds_client
*mdsc
,
2174 struct ceph_mds_session
*session
)
2176 struct ceph_inode_info
*ci
;
2177 struct ceph_cap
*cap
;
2179 dout("early_kick_flushing_caps mds%d\n", session
->s_mds
);
2180 list_for_each_entry(ci
, &session
->s_cap_flushing
, i_flushing_item
) {
2181 spin_lock(&ci
->i_ceph_lock
);
2182 cap
= ci
->i_auth_cap
;
2183 if (!(cap
&& cap
->session
== session
)) {
2184 pr_err("%p auth cap %p not mds%d ???\n",
2185 &ci
->vfs_inode
, cap
, session
->s_mds
);
2186 spin_unlock(&ci
->i_ceph_lock
);
2192 * if flushing caps were revoked, we re-send the cap flush
2193 * in client reconnect stage. This guarantees MDS * processes
2194 * the cap flush message before issuing the flushing caps to
2197 if ((cap
->issued
& ci
->i_flushing_caps
) !=
2198 ci
->i_flushing_caps
) {
2199 spin_unlock(&ci
->i_ceph_lock
);
2200 if (!__kick_flushing_caps(mdsc
, session
, ci
))
2202 spin_lock(&ci
->i_ceph_lock
);
2205 spin_unlock(&ci
->i_ceph_lock
);
2209 void ceph_kick_flushing_caps(struct ceph_mds_client
*mdsc
,
2210 struct ceph_mds_session
*session
)
2212 struct ceph_inode_info
*ci
;
2214 kick_flushing_capsnaps(mdsc
, session
);
2216 dout("kick_flushing_caps mds%d\n", session
->s_mds
);
2217 list_for_each_entry(ci
, &session
->s_cap_flushing
, i_flushing_item
) {
2218 int delayed
= __kick_flushing_caps(mdsc
, session
, ci
);
2220 spin_lock(&ci
->i_ceph_lock
);
2221 __cap_delay_requeue(mdsc
, ci
);
2222 spin_unlock(&ci
->i_ceph_lock
);
2227 static void kick_flushing_inode_caps(struct ceph_mds_client
*mdsc
,
2228 struct ceph_mds_session
*session
,
2229 struct inode
*inode
)
2231 struct ceph_inode_info
*ci
= ceph_inode(inode
);
2232 struct ceph_cap
*cap
;
2234 spin_lock(&ci
->i_ceph_lock
);
2235 cap
= ci
->i_auth_cap
;
2236 dout("kick_flushing_inode_caps %p flushing %s\n", inode
,
2237 ceph_cap_string(ci
->i_flushing_caps
));
2239 __ceph_flush_snaps(ci
, &session
, 1);
2241 if (ci
->i_flushing_caps
) {
2244 spin_lock(&mdsc
->cap_dirty_lock
);
2245 list_move_tail(&ci
->i_flushing_item
,
2246 &cap
->session
->s_cap_flushing
);
2247 spin_unlock(&mdsc
->cap_dirty_lock
);
2249 spin_unlock(&ci
->i_ceph_lock
);
2251 delayed
= __kick_flushing_caps(mdsc
, session
, ci
);
2253 spin_lock(&ci
->i_ceph_lock
);
2254 __cap_delay_requeue(mdsc
, ci
);
2255 spin_unlock(&ci
->i_ceph_lock
);
2258 spin_unlock(&ci
->i_ceph_lock
);
2264 * Take references to capabilities we hold, so that we don't release
2265 * them to the MDS prematurely.
2267 * Protected by i_ceph_lock.
2269 static void __take_cap_refs(struct ceph_inode_info
*ci
, int got
,
2270 bool snap_rwsem_locked
)
2272 if (got
& CEPH_CAP_PIN
)
2274 if (got
& CEPH_CAP_FILE_RD
)
2276 if (got
& CEPH_CAP_FILE_CACHE
)
2277 ci
->i_rdcache_ref
++;
2278 if (got
& CEPH_CAP_FILE_WR
) {
2279 if (ci
->i_wr_ref
== 0 && !ci
->i_head_snapc
) {
2280 BUG_ON(!snap_rwsem_locked
);
2281 ci
->i_head_snapc
= ceph_get_snap_context(
2282 ci
->i_snap_realm
->cached_context
);
2286 if (got
& CEPH_CAP_FILE_BUFFER
) {
2287 if (ci
->i_wb_ref
== 0)
2288 ihold(&ci
->vfs_inode
);
2290 dout("__take_cap_refs %p wb %d -> %d (?)\n",
2291 &ci
->vfs_inode
, ci
->i_wb_ref
-1, ci
->i_wb_ref
);
2296 * Try to grab cap references. Specify those refs we @want, and the
2297 * minimal set we @need. Also include the larger offset we are writing
2298 * to (when applicable), and check against max_size here as well.
2299 * Note that caller is responsible for ensuring max_size increases are
2300 * requested from the MDS.
2302 static int try_get_cap_refs(struct ceph_inode_info
*ci
, int need
, int want
,
2303 loff_t endoff
, bool nonblock
, int *got
, int *err
)
2305 struct inode
*inode
= &ci
->vfs_inode
;
2306 struct ceph_mds_client
*mdsc
= ceph_inode_to_client(inode
)->mdsc
;
2308 int have
, implemented
;
2310 bool snap_rwsem_locked
= false;
2312 dout("get_cap_refs %p need %s want %s\n", inode
,
2313 ceph_cap_string(need
), ceph_cap_string(want
));
2316 spin_lock(&ci
->i_ceph_lock
);
2318 /* make sure file is actually open */
2319 file_wanted
= __ceph_caps_file_wanted(ci
);
2320 if ((file_wanted
& need
) != need
) {
2321 dout("try_get_cap_refs need %s file_wanted %s, EBADF\n",
2322 ceph_cap_string(need
), ceph_cap_string(file_wanted
));
2328 /* finish pending truncate */
2329 while (ci
->i_truncate_pending
) {
2330 spin_unlock(&ci
->i_ceph_lock
);
2331 if (snap_rwsem_locked
) {
2332 up_read(&mdsc
->snap_rwsem
);
2333 snap_rwsem_locked
= false;
2335 __ceph_do_pending_vmtruncate(inode
);
2336 spin_lock(&ci
->i_ceph_lock
);
2339 have
= __ceph_caps_issued(ci
, &implemented
);
2341 if (have
& need
& CEPH_CAP_FILE_WR
) {
2342 if (endoff
>= 0 && endoff
> (loff_t
)ci
->i_max_size
) {
2343 dout("get_cap_refs %p endoff %llu > maxsize %llu\n",
2344 inode
, endoff
, ci
->i_max_size
);
2345 if (endoff
> ci
->i_requested_max_size
) {
2352 * If a sync write is in progress, we must wait, so that we
2353 * can get a final snapshot value for size+mtime.
2355 if (__ceph_have_pending_cap_snap(ci
)) {
2356 dout("get_cap_refs %p cap_snap_pending\n", inode
);
2361 if ((have
& need
) == need
) {
2363 * Look at (implemented & ~have & not) so that we keep waiting
2364 * on transition from wanted -> needed caps. This is needed
2365 * for WRBUFFER|WR -> WR to avoid a new WR sync write from
2366 * going before a prior buffered writeback happens.
2368 int not = want
& ~(have
& need
);
2369 int revoking
= implemented
& ~have
;
2370 dout("get_cap_refs %p have %s but not %s (revoking %s)\n",
2371 inode
, ceph_cap_string(have
), ceph_cap_string(not),
2372 ceph_cap_string(revoking
));
2373 if ((revoking
& not) == 0) {
2374 if (!snap_rwsem_locked
&&
2375 !ci
->i_head_snapc
&&
2376 (need
& CEPH_CAP_FILE_WR
)) {
2377 if (!down_read_trylock(&mdsc
->snap_rwsem
)) {
2379 * we can not call down_read() when
2380 * task isn't in TASK_RUNNING state
2388 spin_unlock(&ci
->i_ceph_lock
);
2389 down_read(&mdsc
->snap_rwsem
);
2390 snap_rwsem_locked
= true;
2393 snap_rwsem_locked
= true;
2395 *got
= need
| (have
& want
);
2396 if ((need
& CEPH_CAP_FILE_RD
) &&
2397 !(*got
& CEPH_CAP_FILE_CACHE
))
2398 ceph_disable_fscache_readpage(ci
);
2399 __take_cap_refs(ci
, *got
, true);
2403 int session_readonly
= false;
2404 if ((need
& CEPH_CAP_FILE_WR
) && ci
->i_auth_cap
) {
2405 struct ceph_mds_session
*s
= ci
->i_auth_cap
->session
;
2406 spin_lock(&s
->s_cap_lock
);
2407 session_readonly
= s
->s_readonly
;
2408 spin_unlock(&s
->s_cap_lock
);
2410 if (session_readonly
) {
2411 dout("get_cap_refs %p needed %s but mds%d readonly\n",
2412 inode
, ceph_cap_string(need
), ci
->i_auth_cap
->mds
);
2418 if (ci
->i_ceph_flags
& CEPH_I_CAP_DROPPED
) {
2420 if (ACCESS_ONCE(mdsc
->fsc
->mount_state
) ==
2421 CEPH_MOUNT_SHUTDOWN
) {
2422 dout("get_cap_refs %p forced umount\n", inode
);
2427 mds_wanted
= __ceph_caps_mds_wanted(ci
);
2428 if ((mds_wanted
& need
) != need
) {
2429 dout("get_cap_refs %p caps were dropped"
2430 " (session killed?)\n", inode
);
2435 if ((mds_wanted
& file_wanted
) ==
2436 (file_wanted
& (CEPH_CAP_FILE_RD
|CEPH_CAP_FILE_WR
)))
2437 ci
->i_ceph_flags
&= ~CEPH_I_CAP_DROPPED
;
2440 dout("get_cap_refs %p have %s needed %s\n", inode
,
2441 ceph_cap_string(have
), ceph_cap_string(need
));
2444 spin_unlock(&ci
->i_ceph_lock
);
2445 if (snap_rwsem_locked
)
2446 up_read(&mdsc
->snap_rwsem
);
2448 dout("get_cap_refs %p ret %d got %s\n", inode
,
2449 ret
, ceph_cap_string(*got
));
2454 * Check the offset we are writing up to against our current
2455 * max_size. If necessary, tell the MDS we want to write to
2458 static void check_max_size(struct inode
*inode
, loff_t endoff
)
2460 struct ceph_inode_info
*ci
= ceph_inode(inode
);
2463 /* do we need to explicitly request a larger max_size? */
2464 spin_lock(&ci
->i_ceph_lock
);
2465 if (endoff
>= ci
->i_max_size
&& endoff
> ci
->i_wanted_max_size
) {
2466 dout("write %p at large endoff %llu, req max_size\n",
2468 ci
->i_wanted_max_size
= endoff
;
2470 /* duplicate ceph_check_caps()'s logic */
2471 if (ci
->i_auth_cap
&&
2472 (ci
->i_auth_cap
->issued
& CEPH_CAP_FILE_WR
) &&
2473 ci
->i_wanted_max_size
> ci
->i_max_size
&&
2474 ci
->i_wanted_max_size
> ci
->i_requested_max_size
)
2476 spin_unlock(&ci
->i_ceph_lock
);
2478 ceph_check_caps(ci
, CHECK_CAPS_AUTHONLY
, NULL
);
2482 * Wait for caps, and take cap references. If we can't get a WR cap
2483 * due to a small max_size, make sure we check_max_size (and possibly
2484 * ask the mds) so we don't get hung up indefinitely.
2486 int ceph_get_caps(struct ceph_inode_info
*ci
, int need
, int want
,
2487 loff_t endoff
, int *got
, struct page
**pinned_page
)
2489 int _got
, ret
, err
= 0;
2491 ret
= ceph_pool_perm_check(ci
, need
);
2497 check_max_size(&ci
->vfs_inode
, endoff
);
2501 ret
= try_get_cap_refs(ci
, need
, want
, endoff
,
2502 false, &_got
, &err
);
2509 ret
= wait_event_interruptible(ci
->i_cap_wq
,
2510 try_get_cap_refs(ci
, need
, want
, endoff
,
2511 true, &_got
, &err
));
2518 if (err
== -ESTALE
) {
2519 /* session was killed, try renew caps */
2520 ret
= ceph_renew_caps(&ci
->vfs_inode
);
2527 if (ci
->i_inline_version
!= CEPH_INLINE_NONE
&&
2528 (_got
& (CEPH_CAP_FILE_CACHE
|CEPH_CAP_FILE_LAZYIO
)) &&
2529 i_size_read(&ci
->vfs_inode
) > 0) {
2531 find_get_page(ci
->vfs_inode
.i_mapping
, 0);
2533 if (PageUptodate(page
)) {
2534 *pinned_page
= page
;
2540 * drop cap refs first because getattr while
2541 * holding * caps refs can cause deadlock.
2543 ceph_put_cap_refs(ci
, _got
);
2547 * getattr request will bring inline data into
2550 ret
= __ceph_do_getattr(&ci
->vfs_inode
, NULL
,
2551 CEPH_STAT_CAP_INLINE_DATA
,
2560 if ((_got
& CEPH_CAP_FILE_RD
) && (_got
& CEPH_CAP_FILE_CACHE
))
2561 ceph_fscache_revalidate_cookie(ci
);
2568 * Take cap refs. Caller must already know we hold at least one ref
2569 * on the caps in question or we don't know this is safe.
2571 void ceph_get_cap_refs(struct ceph_inode_info
*ci
, int caps
)
2573 spin_lock(&ci
->i_ceph_lock
);
2574 __take_cap_refs(ci
, caps
, false);
2575 spin_unlock(&ci
->i_ceph_lock
);
2580 * drop cap_snap that is not associated with any snapshot.
2581 * we don't need to send FLUSHSNAP message for it.
2583 static int ceph_try_drop_cap_snap(struct ceph_cap_snap
*capsnap
)
2585 if (!capsnap
->need_flush
&&
2586 !capsnap
->writing
&& !capsnap
->dirty_pages
) {
2588 dout("dropping cap_snap %p follows %llu\n",
2589 capsnap
, capsnap
->follows
);
2590 ceph_put_snap_context(capsnap
->context
);
2591 list_del(&capsnap
->ci_item
);
2592 list_del(&capsnap
->flushing_item
);
2593 ceph_put_cap_snap(capsnap
);
2602 * If we released the last ref on any given cap, call ceph_check_caps
2603 * to release (or schedule a release).
2605 * If we are releasing a WR cap (from a sync write), finalize any affected
2606 * cap_snap, and wake up any waiters.
2608 void ceph_put_cap_refs(struct ceph_inode_info
*ci
, int had
)
2610 struct inode
*inode
= &ci
->vfs_inode
;
2611 int last
= 0, put
= 0, flushsnaps
= 0, wake
= 0;
2613 spin_lock(&ci
->i_ceph_lock
);
2614 if (had
& CEPH_CAP_PIN
)
2616 if (had
& CEPH_CAP_FILE_RD
)
2617 if (--ci
->i_rd_ref
== 0)
2619 if (had
& CEPH_CAP_FILE_CACHE
)
2620 if (--ci
->i_rdcache_ref
== 0)
2622 if (had
& CEPH_CAP_FILE_BUFFER
) {
2623 if (--ci
->i_wb_ref
== 0) {
2627 dout("put_cap_refs %p wb %d -> %d (?)\n",
2628 inode
, ci
->i_wb_ref
+1, ci
->i_wb_ref
);
2630 if (had
& CEPH_CAP_FILE_WR
)
2631 if (--ci
->i_wr_ref
== 0) {
2633 if (__ceph_have_pending_cap_snap(ci
)) {
2634 struct ceph_cap_snap
*capsnap
=
2635 list_last_entry(&ci
->i_cap_snaps
,
2636 struct ceph_cap_snap
,
2638 capsnap
->writing
= 0;
2639 if (ceph_try_drop_cap_snap(capsnap
))
2641 else if (__ceph_finish_cap_snap(ci
, capsnap
))
2645 if (ci
->i_wrbuffer_ref_head
== 0 &&
2646 ci
->i_dirty_caps
== 0 &&
2647 ci
->i_flushing_caps
== 0) {
2648 BUG_ON(!ci
->i_head_snapc
);
2649 ceph_put_snap_context(ci
->i_head_snapc
);
2650 ci
->i_head_snapc
= NULL
;
2652 /* see comment in __ceph_remove_cap() */
2653 if (!__ceph_is_any_caps(ci
) && ci
->i_snap_realm
)
2654 drop_inode_snap_realm(ci
);
2656 spin_unlock(&ci
->i_ceph_lock
);
2658 dout("put_cap_refs %p had %s%s%s\n", inode
, ceph_cap_string(had
),
2659 last
? " last" : "", put
? " put" : "");
2661 if (last
&& !flushsnaps
)
2662 ceph_check_caps(ci
, 0, NULL
);
2663 else if (flushsnaps
)
2664 ceph_flush_snaps(ci
);
2666 wake_up_all(&ci
->i_cap_wq
);
2672 * Release @nr WRBUFFER refs on dirty pages for the given @snapc snap
2673 * context. Adjust per-snap dirty page accounting as appropriate.
2674 * Once all dirty data for a cap_snap is flushed, flush snapped file
2675 * metadata back to the MDS. If we dropped the last ref, call
2678 void ceph_put_wrbuffer_cap_refs(struct ceph_inode_info
*ci
, int nr
,
2679 struct ceph_snap_context
*snapc
)
2681 struct inode
*inode
= &ci
->vfs_inode
;
2683 int complete_capsnap
= 0;
2684 int drop_capsnap
= 0;
2686 struct ceph_cap_snap
*capsnap
= NULL
;
2688 spin_lock(&ci
->i_ceph_lock
);
2689 ci
->i_wrbuffer_ref
-= nr
;
2690 last
= !ci
->i_wrbuffer_ref
;
2692 if (ci
->i_head_snapc
== snapc
) {
2693 ci
->i_wrbuffer_ref_head
-= nr
;
2694 if (ci
->i_wrbuffer_ref_head
== 0 &&
2695 ci
->i_wr_ref
== 0 &&
2696 ci
->i_dirty_caps
== 0 &&
2697 ci
->i_flushing_caps
== 0) {
2698 BUG_ON(!ci
->i_head_snapc
);
2699 ceph_put_snap_context(ci
->i_head_snapc
);
2700 ci
->i_head_snapc
= NULL
;
2702 dout("put_wrbuffer_cap_refs on %p head %d/%d -> %d/%d %s\n",
2704 ci
->i_wrbuffer_ref
+nr
, ci
->i_wrbuffer_ref_head
+nr
,
2705 ci
->i_wrbuffer_ref
, ci
->i_wrbuffer_ref_head
,
2706 last
? " LAST" : "");
2708 list_for_each_entry(capsnap
, &ci
->i_cap_snaps
, ci_item
) {
2709 if (capsnap
->context
== snapc
) {
2715 capsnap
->dirty_pages
-= nr
;
2716 if (capsnap
->dirty_pages
== 0) {
2717 complete_capsnap
= 1;
2718 drop_capsnap
= ceph_try_drop_cap_snap(capsnap
);
2720 dout("put_wrbuffer_cap_refs on %p cap_snap %p "
2721 " snap %lld %d/%d -> %d/%d %s%s\n",
2722 inode
, capsnap
, capsnap
->context
->seq
,
2723 ci
->i_wrbuffer_ref
+nr
, capsnap
->dirty_pages
+ nr
,
2724 ci
->i_wrbuffer_ref
, capsnap
->dirty_pages
,
2725 last
? " (wrbuffer last)" : "",
2726 complete_capsnap
? " (complete capsnap)" : "");
2729 spin_unlock(&ci
->i_ceph_lock
);
2732 ceph_check_caps(ci
, CHECK_CAPS_AUTHONLY
, NULL
);
2734 } else if (complete_capsnap
) {
2735 ceph_flush_snaps(ci
);
2736 wake_up_all(&ci
->i_cap_wq
);
2743 * Invalidate unlinked inode's aliases, so we can drop the inode ASAP.
2745 static void invalidate_aliases(struct inode
*inode
)
2747 struct dentry
*dn
, *prev
= NULL
;
2749 dout("invalidate_aliases inode %p\n", inode
);
2750 d_prune_aliases(inode
);
2752 * For non-directory inode, d_find_alias() only returns
2753 * hashed dentry. After calling d_invalidate(), the
2754 * dentry becomes unhashed.
2756 * For directory inode, d_find_alias() can return
2757 * unhashed dentry. But directory inode should have
2758 * one alias at most.
2760 while ((dn
= d_find_alias(inode
))) {
2775 * Handle a cap GRANT message from the MDS. (Note that a GRANT may
2776 * actually be a revocation if it specifies a smaller cap set.)
2778 * caller holds s_mutex and i_ceph_lock, we drop both.
2780 static void handle_cap_grant(struct ceph_mds_client
*mdsc
,
2781 struct inode
*inode
, struct ceph_mds_caps
*grant
,
2783 void *inline_data
, int inline_len
,
2784 struct ceph_buffer
*xattr_buf
,
2785 struct ceph_mds_session
*session
,
2786 struct ceph_cap
*cap
, int issued
,
2788 __releases(ci
->i_ceph_lock
)
2789 __releases(mdsc
->snap_rwsem
)
2791 struct ceph_inode_info
*ci
= ceph_inode(inode
);
2792 int mds
= session
->s_mds
;
2793 int seq
= le32_to_cpu(grant
->seq
);
2794 int newcaps
= le32_to_cpu(grant
->caps
);
2795 int used
, wanted
, dirty
;
2796 u64 size
= le64_to_cpu(grant
->size
);
2797 u64 max_size
= le64_to_cpu(grant
->max_size
);
2798 struct timespec mtime
, atime
, ctime
;
2801 bool writeback
= false;
2802 bool queue_trunc
= false;
2803 bool queue_invalidate
= false;
2804 bool deleted_inode
= false;
2805 bool fill_inline
= false;
2807 dout("handle_cap_grant inode %p cap %p mds%d seq %d %s\n",
2808 inode
, cap
, mds
, seq
, ceph_cap_string(newcaps
));
2809 dout(" size %llu max_size %llu, i_size %llu\n", size
, max_size
,
2814 * auth mds of the inode changed. we received the cap export message,
2815 * but still haven't received the cap import message. handle_cap_export
2816 * updated the new auth MDS' cap.
2818 * "ceph_seq_cmp(seq, cap->seq) <= 0" means we are processing a message
2819 * that was sent before the cap import message. So don't remove caps.
2821 if (ceph_seq_cmp(seq
, cap
->seq
) <= 0) {
2822 WARN_ON(cap
!= ci
->i_auth_cap
);
2823 WARN_ON(cap
->cap_id
!= le64_to_cpu(grant
->cap_id
));
2825 newcaps
|= cap
->issued
;
2829 * If CACHE is being revoked, and we have no dirty buffers,
2830 * try to invalidate (once). (If there are dirty buffers, we
2831 * will invalidate _after_ writeback.)
2833 if (!S_ISDIR(inode
->i_mode
) && /* don't invalidate readdir cache */
2834 ((cap
->issued
& ~newcaps
) & CEPH_CAP_FILE_CACHE
) &&
2835 (newcaps
& CEPH_CAP_FILE_LAZYIO
) == 0 &&
2836 !(ci
->i_wrbuffer_ref
|| ci
->i_wb_ref
)) {
2837 if (try_nonblocking_invalidate(inode
)) {
2838 /* there were locked pages.. invalidate later
2839 in a separate thread. */
2840 if (ci
->i_rdcache_revoking
!= ci
->i_rdcache_gen
) {
2841 queue_invalidate
= true;
2842 ci
->i_rdcache_revoking
= ci
->i_rdcache_gen
;
2847 /* side effects now are allowed */
2848 cap
->cap_gen
= session
->s_cap_gen
;
2851 __check_cap_issue(ci
, cap
, newcaps
);
2853 if ((newcaps
& CEPH_CAP_AUTH_SHARED
) &&
2854 (issued
& CEPH_CAP_AUTH_EXCL
) == 0) {
2855 inode
->i_mode
= le32_to_cpu(grant
->mode
);
2856 inode
->i_uid
= make_kuid(&init_user_ns
, le32_to_cpu(grant
->uid
));
2857 inode
->i_gid
= make_kgid(&init_user_ns
, le32_to_cpu(grant
->gid
));
2858 dout("%p mode 0%o uid.gid %d.%d\n", inode
, inode
->i_mode
,
2859 from_kuid(&init_user_ns
, inode
->i_uid
),
2860 from_kgid(&init_user_ns
, inode
->i_gid
));
2863 if ((newcaps
& CEPH_CAP_AUTH_SHARED
) &&
2864 (issued
& CEPH_CAP_LINK_EXCL
) == 0) {
2865 set_nlink(inode
, le32_to_cpu(grant
->nlink
));
2866 if (inode
->i_nlink
== 0 &&
2867 (newcaps
& (CEPH_CAP_LINK_SHARED
| CEPH_CAP_LINK_EXCL
)))
2868 deleted_inode
= true;
2871 if ((issued
& CEPH_CAP_XATTR_EXCL
) == 0 && grant
->xattr_len
) {
2872 int len
= le32_to_cpu(grant
->xattr_len
);
2873 u64 version
= le64_to_cpu(grant
->xattr_version
);
2875 if (version
> ci
->i_xattrs
.version
) {
2876 dout(" got new xattrs v%llu on %p len %d\n",
2877 version
, inode
, len
);
2878 if (ci
->i_xattrs
.blob
)
2879 ceph_buffer_put(ci
->i_xattrs
.blob
);
2880 ci
->i_xattrs
.blob
= ceph_buffer_get(xattr_buf
);
2881 ci
->i_xattrs
.version
= version
;
2882 ceph_forget_all_cached_acls(inode
);
2886 if (newcaps
& CEPH_CAP_ANY_RD
) {
2887 /* ctime/mtime/atime? */
2888 ceph_decode_timespec(&mtime
, &grant
->mtime
);
2889 ceph_decode_timespec(&atime
, &grant
->atime
);
2890 ceph_decode_timespec(&ctime
, &grant
->ctime
);
2891 ceph_fill_file_time(inode
, issued
,
2892 le32_to_cpu(grant
->time_warp_seq
),
2893 &ctime
, &mtime
, &atime
);
2896 if (newcaps
& (CEPH_CAP_ANY_FILE_RD
| CEPH_CAP_ANY_FILE_WR
)) {
2897 /* file layout may have changed */
2898 ci
->i_layout
= grant
->layout
;
2899 ci
->i_pool_ns_len
= pool_ns_len
;
2901 /* size/truncate_seq? */
2902 queue_trunc
= ceph_fill_file_size(inode
, issued
,
2903 le32_to_cpu(grant
->truncate_seq
),
2904 le64_to_cpu(grant
->truncate_size
),
2906 /* max size increase? */
2907 if (ci
->i_auth_cap
== cap
&& max_size
!= ci
->i_max_size
) {
2908 dout("max_size %lld -> %llu\n",
2909 ci
->i_max_size
, max_size
);
2910 ci
->i_max_size
= max_size
;
2911 if (max_size
>= ci
->i_wanted_max_size
) {
2912 ci
->i_wanted_max_size
= 0; /* reset */
2913 ci
->i_requested_max_size
= 0;
2919 /* check cap bits */
2920 wanted
= __ceph_caps_wanted(ci
);
2921 used
= __ceph_caps_used(ci
);
2922 dirty
= __ceph_caps_dirty(ci
);
2923 dout(" my wanted = %s, used = %s, dirty %s\n",
2924 ceph_cap_string(wanted
),
2925 ceph_cap_string(used
),
2926 ceph_cap_string(dirty
));
2927 if (wanted
!= le32_to_cpu(grant
->wanted
)) {
2928 dout("mds wanted %s -> %s\n",
2929 ceph_cap_string(le32_to_cpu(grant
->wanted
)),
2930 ceph_cap_string(wanted
));
2931 /* imported cap may not have correct mds_wanted */
2932 if (le32_to_cpu(grant
->op
) == CEPH_CAP_OP_IMPORT
)
2936 /* revocation, grant, or no-op? */
2937 if (cap
->issued
& ~newcaps
) {
2938 int revoking
= cap
->issued
& ~newcaps
;
2940 dout("revocation: %s -> %s (revoking %s)\n",
2941 ceph_cap_string(cap
->issued
),
2942 ceph_cap_string(newcaps
),
2943 ceph_cap_string(revoking
));
2944 if (revoking
& used
& CEPH_CAP_FILE_BUFFER
)
2945 writeback
= true; /* initiate writeback; will delay ack */
2946 else if (revoking
== CEPH_CAP_FILE_CACHE
&&
2947 (newcaps
& CEPH_CAP_FILE_LAZYIO
) == 0 &&
2949 ; /* do nothing yet, invalidation will be queued */
2950 else if (cap
== ci
->i_auth_cap
)
2951 check_caps
= 1; /* check auth cap only */
2953 check_caps
= 2; /* check all caps */
2954 cap
->issued
= newcaps
;
2955 cap
->implemented
|= newcaps
;
2956 } else if (cap
->issued
== newcaps
) {
2957 dout("caps unchanged: %s -> %s\n",
2958 ceph_cap_string(cap
->issued
), ceph_cap_string(newcaps
));
2960 dout("grant: %s -> %s\n", ceph_cap_string(cap
->issued
),
2961 ceph_cap_string(newcaps
));
2962 /* non-auth MDS is revoking the newly grant caps ? */
2963 if (cap
== ci
->i_auth_cap
&&
2964 __ceph_caps_revoking_other(ci
, cap
, newcaps
))
2967 cap
->issued
= newcaps
;
2968 cap
->implemented
|= newcaps
; /* add bits only, to
2969 * avoid stepping on a
2970 * pending revocation */
2973 BUG_ON(cap
->issued
& ~cap
->implemented
);
2975 if (inline_version
> 0 && inline_version
>= ci
->i_inline_version
) {
2976 ci
->i_inline_version
= inline_version
;
2977 if (ci
->i_inline_version
!= CEPH_INLINE_NONE
&&
2978 (newcaps
& (CEPH_CAP_FILE_CACHE
|CEPH_CAP_FILE_LAZYIO
)))
2982 spin_unlock(&ci
->i_ceph_lock
);
2984 if (le32_to_cpu(grant
->op
) == CEPH_CAP_OP_IMPORT
) {
2985 kick_flushing_inode_caps(mdsc
, session
, inode
);
2986 up_read(&mdsc
->snap_rwsem
);
2987 if (newcaps
& ~issued
)
2992 ceph_fill_inline_data(inode
, NULL
, inline_data
, inline_len
);
2995 ceph_queue_vmtruncate(inode
);
2999 * queue inode for writeback: we can't actually call
3000 * filemap_write_and_wait, etc. from message handler
3003 ceph_queue_writeback(inode
);
3004 if (queue_invalidate
)
3005 ceph_queue_invalidate(inode
);
3007 invalidate_aliases(inode
);
3009 wake_up_all(&ci
->i_cap_wq
);
3011 if (check_caps
== 1)
3012 ceph_check_caps(ci
, CHECK_CAPS_NODELAY
|CHECK_CAPS_AUTHONLY
,
3014 else if (check_caps
== 2)
3015 ceph_check_caps(ci
, CHECK_CAPS_NODELAY
, session
);
3017 mutex_unlock(&session
->s_mutex
);
3021 * Handle FLUSH_ACK from MDS, indicating that metadata we sent to the
3022 * MDS has been safely committed.
3024 static void handle_cap_flush_ack(struct inode
*inode
, u64 flush_tid
,
3025 struct ceph_mds_caps
*m
,
3026 struct ceph_mds_session
*session
,
3027 struct ceph_cap
*cap
)
3028 __releases(ci
->i_ceph_lock
)
3030 struct ceph_inode_info
*ci
= ceph_inode(inode
);
3031 struct ceph_mds_client
*mdsc
= ceph_sb_to_client(inode
->i_sb
)->mdsc
;
3032 struct ceph_cap_flush
*cf
;
3034 LIST_HEAD(to_remove
);
3035 unsigned seq
= le32_to_cpu(m
->seq
);
3036 int dirty
= le32_to_cpu(m
->dirty
);
3040 n
= rb_first(&ci
->i_cap_flush_tree
);
3042 cf
= rb_entry(n
, struct ceph_cap_flush
, i_node
);
3043 n
= rb_next(&cf
->i_node
);
3044 if (cf
->tid
== flush_tid
)
3046 if (cf
->tid
<= flush_tid
) {
3047 rb_erase(&cf
->i_node
, &ci
->i_cap_flush_tree
);
3048 list_add_tail(&cf
->list
, &to_remove
);
3050 cleaned
&= ~cf
->caps
;
3056 dout("handle_cap_flush_ack inode %p mds%d seq %d on %s cleaned %s,"
3057 " flushing %s -> %s\n",
3058 inode
, session
->s_mds
, seq
, ceph_cap_string(dirty
),
3059 ceph_cap_string(cleaned
), ceph_cap_string(ci
->i_flushing_caps
),
3060 ceph_cap_string(ci
->i_flushing_caps
& ~cleaned
));
3062 if (list_empty(&to_remove
) && !cleaned
)
3065 ci
->i_flushing_caps
&= ~cleaned
;
3067 spin_lock(&mdsc
->cap_dirty_lock
);
3069 if (!list_empty(&to_remove
)) {
3070 list_for_each_entry(cf
, &to_remove
, list
)
3071 rb_erase(&cf
->g_node
, &mdsc
->cap_flush_tree
);
3073 n
= rb_first(&mdsc
->cap_flush_tree
);
3074 cf
= n
? rb_entry(n
, struct ceph_cap_flush
, g_node
) : NULL
;
3075 if (!cf
|| cf
->tid
> flush_tid
)
3076 wake_up_all(&mdsc
->cap_flushing_wq
);
3079 if (ci
->i_flushing_caps
== 0) {
3080 list_del_init(&ci
->i_flushing_item
);
3081 if (!list_empty(&session
->s_cap_flushing
))
3082 dout(" mds%d still flushing cap on %p\n",
3084 &list_entry(session
->s_cap_flushing
.next
,
3085 struct ceph_inode_info
,
3086 i_flushing_item
)->vfs_inode
);
3087 mdsc
->num_cap_flushing
--;
3088 dout(" inode %p now !flushing\n", inode
);
3090 if (ci
->i_dirty_caps
== 0) {
3091 dout(" inode %p now clean\n", inode
);
3092 BUG_ON(!list_empty(&ci
->i_dirty_item
));
3094 if (ci
->i_wr_ref
== 0 &&
3095 ci
->i_wrbuffer_ref_head
== 0) {
3096 BUG_ON(!ci
->i_head_snapc
);
3097 ceph_put_snap_context(ci
->i_head_snapc
);
3098 ci
->i_head_snapc
= NULL
;
3101 BUG_ON(list_empty(&ci
->i_dirty_item
));
3104 spin_unlock(&mdsc
->cap_dirty_lock
);
3105 wake_up_all(&ci
->i_cap_wq
);
3108 spin_unlock(&ci
->i_ceph_lock
);
3110 while (!list_empty(&to_remove
)) {
3111 cf
= list_first_entry(&to_remove
,
3112 struct ceph_cap_flush
, list
);
3113 list_del(&cf
->list
);
3114 ceph_free_cap_flush(cf
);
3121 * Handle FLUSHSNAP_ACK. MDS has flushed snap data to disk and we can
3122 * throw away our cap_snap.
3124 * Caller hold s_mutex.
3126 static void handle_cap_flushsnap_ack(struct inode
*inode
, u64 flush_tid
,
3127 struct ceph_mds_caps
*m
,
3128 struct ceph_mds_session
*session
)
3130 struct ceph_inode_info
*ci
= ceph_inode(inode
);
3131 struct ceph_mds_client
*mdsc
= ceph_sb_to_client(inode
->i_sb
)->mdsc
;
3132 u64 follows
= le64_to_cpu(m
->snap_follows
);
3133 struct ceph_cap_snap
*capsnap
;
3136 dout("handle_cap_flushsnap_ack inode %p ci %p mds%d follows %lld\n",
3137 inode
, ci
, session
->s_mds
, follows
);
3139 spin_lock(&ci
->i_ceph_lock
);
3140 list_for_each_entry(capsnap
, &ci
->i_cap_snaps
, ci_item
) {
3141 if (capsnap
->follows
== follows
) {
3142 if (capsnap
->flush_tid
!= flush_tid
) {
3143 dout(" cap_snap %p follows %lld tid %lld !="
3144 " %lld\n", capsnap
, follows
,
3145 flush_tid
, capsnap
->flush_tid
);
3148 WARN_ON(capsnap
->dirty_pages
|| capsnap
->writing
);
3149 dout(" removing %p cap_snap %p follows %lld\n",
3150 inode
, capsnap
, follows
);
3151 ceph_put_snap_context(capsnap
->context
);
3152 list_del(&capsnap
->ci_item
);
3153 list_del(&capsnap
->flushing_item
);
3154 ceph_put_cap_snap(capsnap
);
3155 wake_up_all(&mdsc
->cap_flushing_wq
);
3159 dout(" skipping cap_snap %p follows %lld\n",
3160 capsnap
, capsnap
->follows
);
3163 spin_unlock(&ci
->i_ceph_lock
);
3169 * Handle TRUNC from MDS, indicating file truncation.
3171 * caller hold s_mutex.
3173 static void handle_cap_trunc(struct inode
*inode
,
3174 struct ceph_mds_caps
*trunc
,
3175 struct ceph_mds_session
*session
)
3176 __releases(ci
->i_ceph_lock
)
3178 struct ceph_inode_info
*ci
= ceph_inode(inode
);
3179 int mds
= session
->s_mds
;
3180 int seq
= le32_to_cpu(trunc
->seq
);
3181 u32 truncate_seq
= le32_to_cpu(trunc
->truncate_seq
);
3182 u64 truncate_size
= le64_to_cpu(trunc
->truncate_size
);
3183 u64 size
= le64_to_cpu(trunc
->size
);
3184 int implemented
= 0;
3185 int dirty
= __ceph_caps_dirty(ci
);
3186 int issued
= __ceph_caps_issued(ceph_inode(inode
), &implemented
);
3187 int queue_trunc
= 0;
3189 issued
|= implemented
| dirty
;
3191 dout("handle_cap_trunc inode %p mds%d seq %d to %lld seq %d\n",
3192 inode
, mds
, seq
, truncate_size
, truncate_seq
);
3193 queue_trunc
= ceph_fill_file_size(inode
, issued
,
3194 truncate_seq
, truncate_size
, size
);
3195 spin_unlock(&ci
->i_ceph_lock
);
3198 ceph_queue_vmtruncate(inode
);
3202 * Handle EXPORT from MDS. Cap is being migrated _from_ this mds to a
3203 * different one. If we are the most recent migration we've seen (as
3204 * indicated by mseq), make note of the migrating cap bits for the
3205 * duration (until we see the corresponding IMPORT).
3207 * caller holds s_mutex
3209 static void handle_cap_export(struct inode
*inode
, struct ceph_mds_caps
*ex
,
3210 struct ceph_mds_cap_peer
*ph
,
3211 struct ceph_mds_session
*session
)
3213 struct ceph_mds_client
*mdsc
= ceph_inode_to_client(inode
)->mdsc
;
3214 struct ceph_mds_session
*tsession
= NULL
;
3215 struct ceph_cap
*cap
, *tcap
, *new_cap
= NULL
;
3216 struct ceph_inode_info
*ci
= ceph_inode(inode
);
3218 unsigned mseq
= le32_to_cpu(ex
->migrate_seq
);
3219 unsigned t_seq
, t_mseq
;
3221 int mds
= session
->s_mds
;
3224 t_cap_id
= le64_to_cpu(ph
->cap_id
);
3225 t_seq
= le32_to_cpu(ph
->seq
);
3226 t_mseq
= le32_to_cpu(ph
->mseq
);
3227 target
= le32_to_cpu(ph
->mds
);
3229 t_cap_id
= t_seq
= t_mseq
= 0;
3233 dout("handle_cap_export inode %p ci %p mds%d mseq %d target %d\n",
3234 inode
, ci
, mds
, mseq
, target
);
3236 spin_lock(&ci
->i_ceph_lock
);
3237 cap
= __get_cap_for_mds(ci
, mds
);
3238 if (!cap
|| cap
->cap_id
!= le64_to_cpu(ex
->cap_id
))
3242 __ceph_remove_cap(cap
, false);
3243 if (!ci
->i_auth_cap
)
3244 ci
->i_ceph_flags
|= CEPH_I_CAP_DROPPED
;
3249 * now we know we haven't received the cap import message yet
3250 * because the exported cap still exist.
3253 issued
= cap
->issued
;
3254 WARN_ON(issued
!= cap
->implemented
);
3256 tcap
= __get_cap_for_mds(ci
, target
);
3258 /* already have caps from the target */
3259 if (tcap
->cap_id
!= t_cap_id
||
3260 ceph_seq_cmp(tcap
->seq
, t_seq
) < 0) {
3261 dout(" updating import cap %p mds%d\n", tcap
, target
);
3262 tcap
->cap_id
= t_cap_id
;
3263 tcap
->seq
= t_seq
- 1;
3264 tcap
->issue_seq
= t_seq
- 1;
3265 tcap
->mseq
= t_mseq
;
3266 tcap
->issued
|= issued
;
3267 tcap
->implemented
|= issued
;
3268 if (cap
== ci
->i_auth_cap
)
3269 ci
->i_auth_cap
= tcap
;
3270 if (ci
->i_flushing_caps
&& ci
->i_auth_cap
== tcap
) {
3271 spin_lock(&mdsc
->cap_dirty_lock
);
3272 list_move_tail(&ci
->i_flushing_item
,
3273 &tcap
->session
->s_cap_flushing
);
3274 spin_unlock(&mdsc
->cap_dirty_lock
);
3277 __ceph_remove_cap(cap
, false);
3279 } else if (tsession
) {
3280 /* add placeholder for the export tagert */
3281 int flag
= (cap
== ci
->i_auth_cap
) ? CEPH_CAP_FLAG_AUTH
: 0;
3282 ceph_add_cap(inode
, tsession
, t_cap_id
, -1, issued
, 0,
3283 t_seq
- 1, t_mseq
, (u64
)-1, flag
, &new_cap
);
3285 __ceph_remove_cap(cap
, false);
3289 spin_unlock(&ci
->i_ceph_lock
);
3290 mutex_unlock(&session
->s_mutex
);
3292 /* open target session */
3293 tsession
= ceph_mdsc_open_export_target_session(mdsc
, target
);
3294 if (!IS_ERR(tsession
)) {
3296 mutex_lock(&session
->s_mutex
);
3297 mutex_lock_nested(&tsession
->s_mutex
,
3298 SINGLE_DEPTH_NESTING
);
3300 mutex_lock(&tsession
->s_mutex
);
3301 mutex_lock_nested(&session
->s_mutex
,
3302 SINGLE_DEPTH_NESTING
);
3304 new_cap
= ceph_get_cap(mdsc
, NULL
);
3313 spin_unlock(&ci
->i_ceph_lock
);
3314 mutex_unlock(&session
->s_mutex
);
3316 mutex_unlock(&tsession
->s_mutex
);
3317 ceph_put_mds_session(tsession
);
3320 ceph_put_cap(mdsc
, new_cap
);
3324 * Handle cap IMPORT.
3326 * caller holds s_mutex. acquires i_ceph_lock
3328 static void handle_cap_import(struct ceph_mds_client
*mdsc
,
3329 struct inode
*inode
, struct ceph_mds_caps
*im
,
3330 struct ceph_mds_cap_peer
*ph
,
3331 struct ceph_mds_session
*session
,
3332 struct ceph_cap
**target_cap
, int *old_issued
)
3333 __acquires(ci
->i_ceph_lock
)
3335 struct ceph_inode_info
*ci
= ceph_inode(inode
);
3336 struct ceph_cap
*cap
, *ocap
, *new_cap
= NULL
;
3337 int mds
= session
->s_mds
;
3339 unsigned caps
= le32_to_cpu(im
->caps
);
3340 unsigned wanted
= le32_to_cpu(im
->wanted
);
3341 unsigned seq
= le32_to_cpu(im
->seq
);
3342 unsigned mseq
= le32_to_cpu(im
->migrate_seq
);
3343 u64 realmino
= le64_to_cpu(im
->realm
);
3344 u64 cap_id
= le64_to_cpu(im
->cap_id
);
3349 p_cap_id
= le64_to_cpu(ph
->cap_id
);
3350 peer
= le32_to_cpu(ph
->mds
);
3356 dout("handle_cap_import inode %p ci %p mds%d mseq %d peer %d\n",
3357 inode
, ci
, mds
, mseq
, peer
);
3360 spin_lock(&ci
->i_ceph_lock
);
3361 cap
= __get_cap_for_mds(ci
, mds
);
3364 spin_unlock(&ci
->i_ceph_lock
);
3365 new_cap
= ceph_get_cap(mdsc
, NULL
);
3371 ceph_put_cap(mdsc
, new_cap
);
3376 __ceph_caps_issued(ci
, &issued
);
3377 issued
|= __ceph_caps_dirty(ci
);
3379 ceph_add_cap(inode
, session
, cap_id
, -1, caps
, wanted
, seq
, mseq
,
3380 realmino
, CEPH_CAP_FLAG_AUTH
, &new_cap
);
3382 ocap
= peer
>= 0 ? __get_cap_for_mds(ci
, peer
) : NULL
;
3383 if (ocap
&& ocap
->cap_id
== p_cap_id
) {
3384 dout(" remove export cap %p mds%d flags %d\n",
3385 ocap
, peer
, ph
->flags
);
3386 if ((ph
->flags
& CEPH_CAP_FLAG_AUTH
) &&
3387 (ocap
->seq
!= le32_to_cpu(ph
->seq
) ||
3388 ocap
->mseq
!= le32_to_cpu(ph
->mseq
))) {
3389 pr_err("handle_cap_import: mismatched seq/mseq: "
3390 "ino (%llx.%llx) mds%d seq %d mseq %d "
3391 "importer mds%d has peer seq %d mseq %d\n",
3392 ceph_vinop(inode
), peer
, ocap
->seq
,
3393 ocap
->mseq
, mds
, le32_to_cpu(ph
->seq
),
3394 le32_to_cpu(ph
->mseq
));
3396 __ceph_remove_cap(ocap
, (ph
->flags
& CEPH_CAP_FLAG_RELEASE
));
3399 /* make sure we re-request max_size, if necessary */
3400 ci
->i_wanted_max_size
= 0;
3401 ci
->i_requested_max_size
= 0;
3403 *old_issued
= issued
;
3408 * Handle a caps message from the MDS.
3410 * Identify the appropriate session, inode, and call the right handler
3411 * based on the cap op.
3413 void ceph_handle_caps(struct ceph_mds_session
*session
,
3414 struct ceph_msg
*msg
)
3416 struct ceph_mds_client
*mdsc
= session
->s_mdsc
;
3417 struct super_block
*sb
= mdsc
->fsc
->sb
;
3418 struct inode
*inode
;
3419 struct ceph_inode_info
*ci
;
3420 struct ceph_cap
*cap
;
3421 struct ceph_mds_caps
*h
;
3422 struct ceph_mds_cap_peer
*peer
= NULL
;
3423 struct ceph_snap_realm
*realm
;
3424 int mds
= session
->s_mds
;
3427 struct ceph_vino vino
;
3431 u64 inline_version
= 0;
3432 void *inline_data
= NULL
;
3435 size_t snaptrace_len
;
3436 u32 pool_ns_len
= 0;
3439 dout("handle_caps from mds%d\n", mds
);
3442 end
= msg
->front
.iov_base
+ msg
->front
.iov_len
;
3443 tid
= le64_to_cpu(msg
->hdr
.tid
);
3444 if (msg
->front
.iov_len
< sizeof(*h
))
3446 h
= msg
->front
.iov_base
;
3447 op
= le32_to_cpu(h
->op
);
3448 vino
.ino
= le64_to_cpu(h
->ino
);
3449 vino
.snap
= CEPH_NOSNAP
;
3450 cap_id
= le64_to_cpu(h
->cap_id
);
3451 seq
= le32_to_cpu(h
->seq
);
3452 mseq
= le32_to_cpu(h
->migrate_seq
);
3453 size
= le64_to_cpu(h
->size
);
3454 max_size
= le64_to_cpu(h
->max_size
);
3457 snaptrace_len
= le32_to_cpu(h
->snap_trace_len
);
3458 p
= snaptrace
+ snaptrace_len
;
3460 if (le16_to_cpu(msg
->hdr
.version
) >= 2) {
3462 ceph_decode_32_safe(&p
, end
, flock_len
, bad
);
3463 if (p
+ flock_len
> end
)
3468 if (le16_to_cpu(msg
->hdr
.version
) >= 3) {
3469 if (op
== CEPH_CAP_OP_IMPORT
) {
3470 if (p
+ sizeof(*peer
) > end
)
3474 } else if (op
== CEPH_CAP_OP_EXPORT
) {
3475 /* recorded in unused fields */
3476 peer
= (void *)&h
->size
;
3480 if (le16_to_cpu(msg
->hdr
.version
) >= 4) {
3481 ceph_decode_64_safe(&p
, end
, inline_version
, bad
);
3482 ceph_decode_32_safe(&p
, end
, inline_len
, bad
);
3483 if (p
+ inline_len
> end
)
3489 if (le16_to_cpu(msg
->hdr
.version
) >= 8) {
3491 u32 caller_uid
, caller_gid
;
3492 u32 osd_epoch_barrier
;
3494 ceph_decode_32_safe(&p
, end
, osd_epoch_barrier
, bad
);
3496 ceph_decode_64_safe(&p
, end
, flush_tid
, bad
);
3498 ceph_decode_32_safe(&p
, end
, caller_uid
, bad
);
3499 ceph_decode_32_safe(&p
, end
, caller_gid
, bad
);
3501 ceph_decode_32_safe(&p
, end
, pool_ns_len
, bad
);
3505 inode
= ceph_find_inode(sb
, vino
);
3506 ci
= ceph_inode(inode
);
3507 dout(" op %s ino %llx.%llx inode %p\n", ceph_cap_op_name(op
), vino
.ino
,
3510 mutex_lock(&session
->s_mutex
);
3512 dout(" mds%d seq %lld cap seq %u\n", session
->s_mds
, session
->s_seq
,
3516 dout(" i don't have ino %llx\n", vino
.ino
);
3518 if (op
== CEPH_CAP_OP_IMPORT
) {
3519 cap
= ceph_get_cap(mdsc
, NULL
);
3520 cap
->cap_ino
= vino
.ino
;
3521 cap
->queue_release
= 1;
3522 cap
->cap_id
= cap_id
;
3525 spin_lock(&session
->s_cap_lock
);
3526 list_add_tail(&cap
->session_caps
,
3527 &session
->s_cap_releases
);
3528 session
->s_num_cap_releases
++;
3529 spin_unlock(&session
->s_cap_lock
);
3531 goto flush_cap_releases
;
3534 /* these will work even if we don't have a cap yet */
3536 case CEPH_CAP_OP_FLUSHSNAP_ACK
:
3537 handle_cap_flushsnap_ack(inode
, tid
, h
, session
);
3540 case CEPH_CAP_OP_EXPORT
:
3541 handle_cap_export(inode
, h
, peer
, session
);
3544 case CEPH_CAP_OP_IMPORT
:
3546 if (snaptrace_len
) {
3547 down_write(&mdsc
->snap_rwsem
);
3548 ceph_update_snap_trace(mdsc
, snaptrace
,
3549 snaptrace
+ snaptrace_len
,
3551 downgrade_write(&mdsc
->snap_rwsem
);
3553 down_read(&mdsc
->snap_rwsem
);
3555 handle_cap_import(mdsc
, inode
, h
, peer
, session
,
3557 handle_cap_grant(mdsc
, inode
, h
,
3558 inline_version
, inline_data
, inline_len
,
3559 msg
->middle
, session
, cap
, issued
,
3562 ceph_put_snap_realm(mdsc
, realm
);
3566 /* the rest require a cap */
3567 spin_lock(&ci
->i_ceph_lock
);
3568 cap
= __get_cap_for_mds(ceph_inode(inode
), mds
);
3570 dout(" no cap on %p ino %llx.%llx from mds%d\n",
3571 inode
, ceph_ino(inode
), ceph_snap(inode
), mds
);
3572 spin_unlock(&ci
->i_ceph_lock
);
3573 goto flush_cap_releases
;
3576 /* note that each of these drops i_ceph_lock for us */
3578 case CEPH_CAP_OP_REVOKE
:
3579 case CEPH_CAP_OP_GRANT
:
3580 __ceph_caps_issued(ci
, &issued
);
3581 issued
|= __ceph_caps_dirty(ci
);
3582 handle_cap_grant(mdsc
, inode
, h
,
3583 inline_version
, inline_data
, inline_len
,
3584 msg
->middle
, session
, cap
, issued
,
3588 case CEPH_CAP_OP_FLUSH_ACK
:
3589 handle_cap_flush_ack(inode
, tid
, h
, session
, cap
);
3592 case CEPH_CAP_OP_TRUNC
:
3593 handle_cap_trunc(inode
, h
, session
);
3597 spin_unlock(&ci
->i_ceph_lock
);
3598 pr_err("ceph_handle_caps: unknown cap op %d %s\n", op
,
3599 ceph_cap_op_name(op
));
3606 * send any cap release message to try to move things
3607 * along for the mds (who clearly thinks we still have this
3610 ceph_send_cap_releases(mdsc
, session
);
3613 mutex_unlock(&session
->s_mutex
);
3619 pr_err("ceph_handle_caps: corrupt message\n");
3625 * Delayed work handler to process end of delayed cap release LRU list.
3627 void ceph_check_delayed_caps(struct ceph_mds_client
*mdsc
)
3629 struct ceph_inode_info
*ci
;
3630 int flags
= CHECK_CAPS_NODELAY
;
3632 dout("check_delayed_caps\n");
3634 spin_lock(&mdsc
->cap_delay_lock
);
3635 if (list_empty(&mdsc
->cap_delay_list
))
3637 ci
= list_first_entry(&mdsc
->cap_delay_list
,
3638 struct ceph_inode_info
,
3640 if ((ci
->i_ceph_flags
& CEPH_I_FLUSH
) == 0 &&
3641 time_before(jiffies
, ci
->i_hold_caps_max
))
3643 list_del_init(&ci
->i_cap_delay_list
);
3644 spin_unlock(&mdsc
->cap_delay_lock
);
3645 dout("check_delayed_caps on %p\n", &ci
->vfs_inode
);
3646 ceph_check_caps(ci
, flags
, NULL
);
3648 spin_unlock(&mdsc
->cap_delay_lock
);
3652 * Flush all dirty caps to the mds
3654 void ceph_flush_dirty_caps(struct ceph_mds_client
*mdsc
)
3656 struct ceph_inode_info
*ci
;
3657 struct inode
*inode
;
3659 dout("flush_dirty_caps\n");
3660 spin_lock(&mdsc
->cap_dirty_lock
);
3661 while (!list_empty(&mdsc
->cap_dirty
)) {
3662 ci
= list_first_entry(&mdsc
->cap_dirty
, struct ceph_inode_info
,
3664 inode
= &ci
->vfs_inode
;
3666 dout("flush_dirty_caps %p\n", inode
);
3667 spin_unlock(&mdsc
->cap_dirty_lock
);
3668 ceph_check_caps(ci
, CHECK_CAPS_NODELAY
|CHECK_CAPS_FLUSH
, NULL
);
3670 spin_lock(&mdsc
->cap_dirty_lock
);
3672 spin_unlock(&mdsc
->cap_dirty_lock
);
3673 dout("flush_dirty_caps done\n");
3677 * Drop open file reference. If we were the last open file,
3678 * we may need to release capabilities to the MDS (or schedule
3679 * their delayed release).
3681 void ceph_put_fmode(struct ceph_inode_info
*ci
, int fmode
)
3683 struct inode
*inode
= &ci
->vfs_inode
;
3686 spin_lock(&ci
->i_ceph_lock
);
3687 dout("put_fmode %p fmode %d %d -> %d\n", inode
, fmode
,
3688 ci
->i_nr_by_mode
[fmode
], ci
->i_nr_by_mode
[fmode
]-1);
3689 BUG_ON(ci
->i_nr_by_mode
[fmode
] == 0);
3690 if (--ci
->i_nr_by_mode
[fmode
] == 0)
3692 spin_unlock(&ci
->i_ceph_lock
);
3694 if (last
&& ci
->i_vino
.snap
== CEPH_NOSNAP
)
3695 ceph_check_caps(ci
, 0, NULL
);
3699 * Helpers for embedding cap and dentry lease releases into mds
3702 * @force is used by dentry_release (below) to force inclusion of a
3703 * record for the directory inode, even when there aren't any caps to
3706 int ceph_encode_inode_release(void **p
, struct inode
*inode
,
3707 int mds
, int drop
, int unless
, int force
)
3709 struct ceph_inode_info
*ci
= ceph_inode(inode
);
3710 struct ceph_cap
*cap
;
3711 struct ceph_mds_request_release
*rel
= *p
;
3715 spin_lock(&ci
->i_ceph_lock
);
3716 used
= __ceph_caps_used(ci
);
3717 dirty
= __ceph_caps_dirty(ci
);
3719 dout("encode_inode_release %p mds%d used|dirty %s drop %s unless %s\n",
3720 inode
, mds
, ceph_cap_string(used
|dirty
), ceph_cap_string(drop
),
3721 ceph_cap_string(unless
));
3723 /* only drop unused, clean caps */
3724 drop
&= ~(used
| dirty
);
3726 cap
= __get_cap_for_mds(ci
, mds
);
3727 if (cap
&& __cap_is_valid(cap
)) {
3729 ((cap
->issued
& drop
) &&
3730 (cap
->issued
& unless
) == 0)) {
3731 if ((cap
->issued
& drop
) &&
3732 (cap
->issued
& unless
) == 0) {
3733 int wanted
= __ceph_caps_wanted(ci
);
3734 if ((ci
->i_ceph_flags
& CEPH_I_NODELAY
) == 0)
3735 wanted
|= cap
->mds_wanted
;
3736 dout("encode_inode_release %p cap %p "
3737 "%s -> %s, wanted %s -> %s\n", inode
, cap
,
3738 ceph_cap_string(cap
->issued
),
3739 ceph_cap_string(cap
->issued
& ~drop
),
3740 ceph_cap_string(cap
->mds_wanted
),
3741 ceph_cap_string(wanted
));
3743 cap
->issued
&= ~drop
;
3744 cap
->implemented
&= ~drop
;
3745 cap
->mds_wanted
= wanted
;
3747 dout("encode_inode_release %p cap %p %s"
3748 " (force)\n", inode
, cap
,
3749 ceph_cap_string(cap
->issued
));
3752 rel
->ino
= cpu_to_le64(ceph_ino(inode
));
3753 rel
->cap_id
= cpu_to_le64(cap
->cap_id
);
3754 rel
->seq
= cpu_to_le32(cap
->seq
);
3755 rel
->issue_seq
= cpu_to_le32(cap
->issue_seq
);
3756 rel
->mseq
= cpu_to_le32(cap
->mseq
);
3757 rel
->caps
= cpu_to_le32(cap
->implemented
);
3758 rel
->wanted
= cpu_to_le32(cap
->mds_wanted
);
3764 dout("encode_inode_release %p cap %p %s\n",
3765 inode
, cap
, ceph_cap_string(cap
->issued
));
3768 spin_unlock(&ci
->i_ceph_lock
);
3772 int ceph_encode_dentry_release(void **p
, struct dentry
*dentry
,
3773 int mds
, int drop
, int unless
)
3775 struct inode
*dir
= d_inode(dentry
->d_parent
);
3776 struct ceph_mds_request_release
*rel
= *p
;
3777 struct ceph_dentry_info
*di
= ceph_dentry(dentry
);
3782 * force an record for the directory caps if we have a dentry lease.
3783 * this is racy (can't take i_ceph_lock and d_lock together), but it
3784 * doesn't have to be perfect; the mds will revoke anything we don't
3787 spin_lock(&dentry
->d_lock
);
3788 if (di
->lease_session
&& di
->lease_session
->s_mds
== mds
)
3790 spin_unlock(&dentry
->d_lock
);
3792 ret
= ceph_encode_inode_release(p
, dir
, mds
, drop
, unless
, force
);
3794 spin_lock(&dentry
->d_lock
);
3795 if (ret
&& di
->lease_session
&& di
->lease_session
->s_mds
== mds
) {
3796 dout("encode_dentry_release %p mds%d seq %d\n",
3797 dentry
, mds
, (int)di
->lease_seq
);
3798 rel
->dname_len
= cpu_to_le32(dentry
->d_name
.len
);
3799 memcpy(*p
, dentry
->d_name
.name
, dentry
->d_name
.len
);
3800 *p
+= dentry
->d_name
.len
;
3801 rel
->dname_seq
= cpu_to_le32(di
->lease_seq
);
3802 __ceph_mdsc_drop_dentry_lease(dentry
);
3804 spin_unlock(&dentry
->d_lock
);