1 // SPDX-License-Identifier: GPL-2.0
2 #include <linux/ceph/ceph_debug.h>
5 #include <linux/kernel.h>
6 #include <linux/sched/signal.h>
7 #include <linux/slab.h>
8 #include <linux/vmalloc.h>
9 #include <linux/wait.h>
10 #include <linux/writeback.h>
11 #include <linux/iversion.h>
14 #include "mds_client.h"
16 #include <linux/ceph/decode.h>
17 #include <linux/ceph/messenger.h>
20 * Capability management
22 * The Ceph metadata servers control client access to inode metadata
23 * and file data by issuing capabilities, granting clients permission
24 * to read and/or write both inode field and file data to OSDs
25 * (storage nodes). Each capability consists of a set of bits
26 * indicating which operations are allowed.
28 * If the client holds a *_SHARED cap, the client has a coherent value
29 * that can be safely read from the cached inode.
31 * In the case of a *_EXCL (exclusive) or FILE_WR capabilities, the
32 * client is allowed to change inode attributes (e.g., file size,
33 * mtime), note its dirty state in the ceph_cap, and asynchronously
34 * flush that metadata change to the MDS.
36 * In the event of a conflicting operation (perhaps by another
37 * client), the MDS will revoke the conflicting client capabilities.
39 * In order for a client to cache an inode, it must hold a capability
40 * with at least one MDS server. When inodes are released, release
41 * notifications are batched and periodically sent en masse to the MDS
42 * cluster to release server state.
45 static u64 __get_oldest_flush_tid(struct ceph_mds_client *mdsc);
46 static void __kick_flushing_caps(struct ceph_mds_client *mdsc,
47 struct ceph_mds_session *session,
48 struct ceph_inode_info *ci,
49 u64 oldest_flush_tid);
52 * Generate readable cap strings for debugging output.
54 #define MAX_CAP_STR 20
55 static char cap_str[MAX_CAP_STR][40];
56 static DEFINE_SPINLOCK(cap_str_lock);
57 static int last_cap_str;
59 static char *gcap_string(char *s, int c)
61 if (c & CEPH_CAP_GSHARED)
63 if (c & CEPH_CAP_GEXCL)
65 if (c & CEPH_CAP_GCACHE)
71 if (c & CEPH_CAP_GBUFFER)
73 if (c & CEPH_CAP_GWREXTEND)
75 if (c & CEPH_CAP_GLAZYIO)
80 const char *ceph_cap_string(int caps)
86 spin_lock(&cap_str_lock);
88 if (last_cap_str == MAX_CAP_STR)
90 spin_unlock(&cap_str_lock);
94 if (caps & CEPH_CAP_PIN)
97 c = (caps >> CEPH_CAP_SAUTH) & 3;
100 s = gcap_string(s, c);
103 c = (caps >> CEPH_CAP_SLINK) & 3;
106 s = gcap_string(s, c);
109 c = (caps >> CEPH_CAP_SXATTR) & 3;
112 s = gcap_string(s, c);
115 c = caps >> CEPH_CAP_SFILE;
118 s = gcap_string(s, c);
127 void ceph_caps_init(struct ceph_mds_client *mdsc)
129 INIT_LIST_HEAD(&mdsc->caps_list);
130 spin_lock_init(&mdsc->caps_list_lock);
133 void ceph_caps_finalize(struct ceph_mds_client *mdsc)
135 struct ceph_cap *cap;
137 spin_lock(&mdsc->caps_list_lock);
138 while (!list_empty(&mdsc->caps_list)) {
139 cap = list_first_entry(&mdsc->caps_list,
140 struct ceph_cap, caps_item);
141 list_del(&cap->caps_item);
142 kmem_cache_free(ceph_cap_cachep, cap);
144 mdsc->caps_total_count = 0;
145 mdsc->caps_avail_count = 0;
146 mdsc->caps_use_count = 0;
147 mdsc->caps_reserve_count = 0;
148 mdsc->caps_min_count = 0;
149 spin_unlock(&mdsc->caps_list_lock);
152 void ceph_adjust_caps_max_min(struct ceph_mds_client *mdsc,
153 struct ceph_mount_options *fsopt)
155 spin_lock(&mdsc->caps_list_lock);
156 mdsc->caps_min_count = fsopt->max_readdir;
157 if (mdsc->caps_min_count < 1024)
158 mdsc->caps_min_count = 1024;
159 mdsc->caps_use_max = fsopt->caps_max;
160 if (mdsc->caps_use_max > 0 &&
161 mdsc->caps_use_max < mdsc->caps_min_count)
162 mdsc->caps_use_max = mdsc->caps_min_count;
163 spin_unlock(&mdsc->caps_list_lock);
166 static void __ceph_unreserve_caps(struct ceph_mds_client *mdsc, int nr_caps)
168 struct ceph_cap *cap;
172 BUG_ON(mdsc->caps_reserve_count < nr_caps);
173 mdsc->caps_reserve_count -= nr_caps;
174 if (mdsc->caps_avail_count >=
175 mdsc->caps_reserve_count + mdsc->caps_min_count) {
176 mdsc->caps_total_count -= nr_caps;
177 for (i = 0; i < nr_caps; i++) {
178 cap = list_first_entry(&mdsc->caps_list,
179 struct ceph_cap, caps_item);
180 list_del(&cap->caps_item);
181 kmem_cache_free(ceph_cap_cachep, cap);
184 mdsc->caps_avail_count += nr_caps;
187 dout("%s: caps %d = %d used + %d resv + %d avail\n",
189 mdsc->caps_total_count, mdsc->caps_use_count,
190 mdsc->caps_reserve_count, mdsc->caps_avail_count);
191 BUG_ON(mdsc->caps_total_count != mdsc->caps_use_count +
192 mdsc->caps_reserve_count +
193 mdsc->caps_avail_count);
198 * Called under mdsc->mutex.
200 int ceph_reserve_caps(struct ceph_mds_client *mdsc,
201 struct ceph_cap_reservation *ctx, int need)
204 struct ceph_cap *cap;
209 bool trimmed = false;
210 struct ceph_mds_session *s;
213 dout("reserve caps ctx=%p need=%d\n", ctx, need);
215 /* first reserve any caps that are already allocated */
216 spin_lock(&mdsc->caps_list_lock);
217 if (mdsc->caps_avail_count >= need)
220 have = mdsc->caps_avail_count;
221 mdsc->caps_avail_count -= have;
222 mdsc->caps_reserve_count += have;
223 BUG_ON(mdsc->caps_total_count != mdsc->caps_use_count +
224 mdsc->caps_reserve_count +
225 mdsc->caps_avail_count);
226 spin_unlock(&mdsc->caps_list_lock);
228 for (i = have; i < need; ) {
229 cap = kmem_cache_alloc(ceph_cap_cachep, GFP_NOFS);
231 list_add(&cap->caps_item, &newcaps);
238 for (j = 0; j < mdsc->max_sessions; j++) {
239 s = __ceph_lookup_mds_session(mdsc, j);
242 mutex_unlock(&mdsc->mutex);
244 mutex_lock(&s->s_mutex);
245 max_caps = s->s_nr_caps - (need - i);
246 ceph_trim_caps(mdsc, s, max_caps);
247 mutex_unlock(&s->s_mutex);
249 ceph_put_mds_session(s);
250 mutex_lock(&mdsc->mutex);
254 spin_lock(&mdsc->caps_list_lock);
255 if (mdsc->caps_avail_count) {
257 if (mdsc->caps_avail_count >= need - i)
258 more_have = need - i;
260 more_have = mdsc->caps_avail_count;
264 mdsc->caps_avail_count -= more_have;
265 mdsc->caps_reserve_count += more_have;
268 spin_unlock(&mdsc->caps_list_lock);
273 pr_warn("reserve caps ctx=%p ENOMEM need=%d got=%d\n",
274 ctx, need, have + alloc);
280 BUG_ON(have + alloc != need);
285 spin_lock(&mdsc->caps_list_lock);
286 mdsc->caps_total_count += alloc;
287 mdsc->caps_reserve_count += alloc;
288 list_splice(&newcaps, &mdsc->caps_list);
290 BUG_ON(mdsc->caps_total_count != mdsc->caps_use_count +
291 mdsc->caps_reserve_count +
292 mdsc->caps_avail_count);
295 __ceph_unreserve_caps(mdsc, have + alloc);
297 spin_unlock(&mdsc->caps_list_lock);
299 dout("reserve caps ctx=%p %d = %d used + %d resv + %d avail\n",
300 ctx, mdsc->caps_total_count, mdsc->caps_use_count,
301 mdsc->caps_reserve_count, mdsc->caps_avail_count);
305 void ceph_unreserve_caps(struct ceph_mds_client *mdsc,
306 struct ceph_cap_reservation *ctx)
308 bool reclaim = false;
312 dout("unreserve caps ctx=%p count=%d\n", ctx, ctx->count);
313 spin_lock(&mdsc->caps_list_lock);
314 __ceph_unreserve_caps(mdsc, ctx->count);
317 if (mdsc->caps_use_max > 0 &&
318 mdsc->caps_use_count > mdsc->caps_use_max)
320 spin_unlock(&mdsc->caps_list_lock);
323 ceph_reclaim_caps_nr(mdsc, ctx->used);
326 struct ceph_cap *ceph_get_cap(struct ceph_mds_client *mdsc,
327 struct ceph_cap_reservation *ctx)
329 struct ceph_cap *cap = NULL;
331 /* temporary, until we do something about cap import/export */
333 cap = kmem_cache_alloc(ceph_cap_cachep, GFP_NOFS);
335 spin_lock(&mdsc->caps_list_lock);
336 mdsc->caps_use_count++;
337 mdsc->caps_total_count++;
338 spin_unlock(&mdsc->caps_list_lock);
340 spin_lock(&mdsc->caps_list_lock);
341 if (mdsc->caps_avail_count) {
342 BUG_ON(list_empty(&mdsc->caps_list));
344 mdsc->caps_avail_count--;
345 mdsc->caps_use_count++;
346 cap = list_first_entry(&mdsc->caps_list,
347 struct ceph_cap, caps_item);
348 list_del(&cap->caps_item);
350 BUG_ON(mdsc->caps_total_count != mdsc->caps_use_count +
351 mdsc->caps_reserve_count + mdsc->caps_avail_count);
353 spin_unlock(&mdsc->caps_list_lock);
359 spin_lock(&mdsc->caps_list_lock);
360 dout("get_cap ctx=%p (%d) %d = %d used + %d resv + %d avail\n",
361 ctx, ctx->count, mdsc->caps_total_count, mdsc->caps_use_count,
362 mdsc->caps_reserve_count, mdsc->caps_avail_count);
364 BUG_ON(ctx->count > mdsc->caps_reserve_count);
365 BUG_ON(list_empty(&mdsc->caps_list));
369 mdsc->caps_reserve_count--;
370 mdsc->caps_use_count++;
372 cap = list_first_entry(&mdsc->caps_list, struct ceph_cap, caps_item);
373 list_del(&cap->caps_item);
375 BUG_ON(mdsc->caps_total_count != mdsc->caps_use_count +
376 mdsc->caps_reserve_count + mdsc->caps_avail_count);
377 spin_unlock(&mdsc->caps_list_lock);
381 void ceph_put_cap(struct ceph_mds_client *mdsc, struct ceph_cap *cap)
383 spin_lock(&mdsc->caps_list_lock);
384 dout("put_cap %p %d = %d used + %d resv + %d avail\n",
385 cap, mdsc->caps_total_count, mdsc->caps_use_count,
386 mdsc->caps_reserve_count, mdsc->caps_avail_count);
387 mdsc->caps_use_count--;
389 * Keep some preallocated caps around (ceph_min_count), to
390 * avoid lots of free/alloc churn.
392 if (mdsc->caps_avail_count >= mdsc->caps_reserve_count +
393 mdsc->caps_min_count) {
394 mdsc->caps_total_count--;
395 kmem_cache_free(ceph_cap_cachep, cap);
397 mdsc->caps_avail_count++;
398 list_add(&cap->caps_item, &mdsc->caps_list);
401 BUG_ON(mdsc->caps_total_count != mdsc->caps_use_count +
402 mdsc->caps_reserve_count + mdsc->caps_avail_count);
403 spin_unlock(&mdsc->caps_list_lock);
406 void ceph_reservation_status(struct ceph_fs_client *fsc,
407 int *total, int *avail, int *used, int *reserved,
410 struct ceph_mds_client *mdsc = fsc->mdsc;
412 spin_lock(&mdsc->caps_list_lock);
415 *total = mdsc->caps_total_count;
417 *avail = mdsc->caps_avail_count;
419 *used = mdsc->caps_use_count;
421 *reserved = mdsc->caps_reserve_count;
423 *min = mdsc->caps_min_count;
425 spin_unlock(&mdsc->caps_list_lock);
429 * Find ceph_cap for given mds, if any.
431 * Called with i_ceph_lock held.
433 static struct ceph_cap *__get_cap_for_mds(struct ceph_inode_info *ci, int mds)
435 struct ceph_cap *cap;
436 struct rb_node *n = ci->i_caps.rb_node;
439 cap = rb_entry(n, struct ceph_cap, ci_node);
442 else if (mds > cap->mds)
450 struct ceph_cap *ceph_get_cap_for_mds(struct ceph_inode_info *ci, int mds)
452 struct ceph_cap *cap;
454 spin_lock(&ci->i_ceph_lock);
455 cap = __get_cap_for_mds(ci, mds);
456 spin_unlock(&ci->i_ceph_lock);
461 * Called under i_ceph_lock.
463 static void __insert_cap_node(struct ceph_inode_info *ci,
464 struct ceph_cap *new)
466 struct rb_node **p = &ci->i_caps.rb_node;
467 struct rb_node *parent = NULL;
468 struct ceph_cap *cap = NULL;
472 cap = rb_entry(parent, struct ceph_cap, ci_node);
473 if (new->mds < cap->mds)
475 else if (new->mds > cap->mds)
481 rb_link_node(&new->ci_node, parent, p);
482 rb_insert_color(&new->ci_node, &ci->i_caps);
486 * (re)set cap hold timeouts, which control the delayed release
487 * of unused caps back to the MDS. Should be called on cap use.
489 static void __cap_set_timeouts(struct ceph_mds_client *mdsc,
490 struct ceph_inode_info *ci)
492 struct ceph_mount_options *opt = mdsc->fsc->mount_options;
493 ci->i_hold_caps_max = round_jiffies(jiffies +
494 opt->caps_wanted_delay_max * HZ);
495 dout("__cap_set_timeouts %p %lu\n", &ci->vfs_inode,
496 ci->i_hold_caps_max - jiffies);
500 * (Re)queue cap at the end of the delayed cap release list.
502 * If I_FLUSH is set, leave the inode at the front of the list.
504 * Caller holds i_ceph_lock
505 * -> we take mdsc->cap_delay_lock
507 static void __cap_delay_requeue(struct ceph_mds_client *mdsc,
508 struct ceph_inode_info *ci)
510 dout("__cap_delay_requeue %p flags 0x%lx at %lu\n", &ci->vfs_inode,
511 ci->i_ceph_flags, ci->i_hold_caps_max);
512 if (!mdsc->stopping) {
513 spin_lock(&mdsc->cap_delay_lock);
514 if (!list_empty(&ci->i_cap_delay_list)) {
515 if (ci->i_ceph_flags & CEPH_I_FLUSH)
517 list_del_init(&ci->i_cap_delay_list);
519 __cap_set_timeouts(mdsc, ci);
520 list_add_tail(&ci->i_cap_delay_list, &mdsc->cap_delay_list);
522 spin_unlock(&mdsc->cap_delay_lock);
527 * Queue an inode for immediate writeback. Mark inode with I_FLUSH,
528 * indicating we should send a cap message to flush dirty metadata
529 * asap, and move to the front of the delayed cap list.
531 static void __cap_delay_requeue_front(struct ceph_mds_client *mdsc,
532 struct ceph_inode_info *ci)
534 dout("__cap_delay_requeue_front %p\n", &ci->vfs_inode);
535 spin_lock(&mdsc->cap_delay_lock);
536 ci->i_ceph_flags |= CEPH_I_FLUSH;
537 if (!list_empty(&ci->i_cap_delay_list))
538 list_del_init(&ci->i_cap_delay_list);
539 list_add(&ci->i_cap_delay_list, &mdsc->cap_delay_list);
540 spin_unlock(&mdsc->cap_delay_lock);
544 * Cancel delayed work on cap.
546 * Caller must hold i_ceph_lock.
548 static void __cap_delay_cancel(struct ceph_mds_client *mdsc,
549 struct ceph_inode_info *ci)
551 dout("__cap_delay_cancel %p\n", &ci->vfs_inode);
552 if (list_empty(&ci->i_cap_delay_list))
554 spin_lock(&mdsc->cap_delay_lock);
555 list_del_init(&ci->i_cap_delay_list);
556 spin_unlock(&mdsc->cap_delay_lock);
559 /* Common issue checks for add_cap, handle_cap_grant. */
560 static void __check_cap_issue(struct ceph_inode_info *ci, struct ceph_cap *cap,
563 unsigned had = __ceph_caps_issued(ci, NULL);
565 lockdep_assert_held(&ci->i_ceph_lock);
568 * Each time we receive FILE_CACHE anew, we increment
571 if (S_ISREG(ci->vfs_inode.i_mode) &&
572 (issued & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) &&
573 (had & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) == 0) {
578 * If FILE_SHARED is newly issued, mark dir not complete. We don't
579 * know what happened to this directory while we didn't have the cap.
580 * If FILE_SHARED is being revoked, also mark dir not complete. It
581 * stops on-going cached readdir.
583 if ((issued & CEPH_CAP_FILE_SHARED) != (had & CEPH_CAP_FILE_SHARED)) {
584 if (issued & CEPH_CAP_FILE_SHARED)
585 atomic_inc(&ci->i_shared_gen);
586 if (S_ISDIR(ci->vfs_inode.i_mode)) {
587 dout(" marking %p NOT complete\n", &ci->vfs_inode);
588 __ceph_dir_clear_complete(ci);
592 /* Wipe saved layout if we're losing DIR_CREATE caps */
593 if (S_ISDIR(ci->vfs_inode.i_mode) && (had & CEPH_CAP_DIR_CREATE) &&
594 !(issued & CEPH_CAP_DIR_CREATE)) {
595 ceph_put_string(rcu_dereference_raw(ci->i_cached_layout.pool_ns));
596 memset(&ci->i_cached_layout, 0, sizeof(ci->i_cached_layout));
601 * change_auth_cap_ses - move inode to appropriate lists when auth caps change
602 * @ci: inode to be moved
603 * @session: new auth caps session
605 static void change_auth_cap_ses(struct ceph_inode_info *ci,
606 struct ceph_mds_session *session)
608 lockdep_assert_held(&ci->i_ceph_lock);
610 if (list_empty(&ci->i_dirty_item) && list_empty(&ci->i_flushing_item))
613 spin_lock(&session->s_mdsc->cap_dirty_lock);
614 if (!list_empty(&ci->i_dirty_item))
615 list_move(&ci->i_dirty_item, &session->s_cap_dirty);
616 if (!list_empty(&ci->i_flushing_item))
617 list_move_tail(&ci->i_flushing_item, &session->s_cap_flushing);
618 spin_unlock(&session->s_mdsc->cap_dirty_lock);
622 * Add a capability under the given MDS session.
624 * Caller should hold session snap_rwsem (read) and ci->i_ceph_lock
626 * @fmode is the open file mode, if we are opening a file, otherwise
627 * it is < 0. (This is so we can atomically add the cap and add an
628 * open file reference to it.)
630 void ceph_add_cap(struct inode *inode,
631 struct ceph_mds_session *session, u64 cap_id,
632 unsigned issued, unsigned wanted,
633 unsigned seq, unsigned mseq, u64 realmino, int flags,
634 struct ceph_cap **new_cap)
636 struct ceph_mds_client *mdsc = ceph_inode_to_client(inode)->mdsc;
637 struct ceph_inode_info *ci = ceph_inode(inode);
638 struct ceph_cap *cap;
639 int mds = session->s_mds;
643 lockdep_assert_held(&ci->i_ceph_lock);
645 dout("add_cap %p mds%d cap %llx %s seq %d\n", inode,
646 session->s_mds, cap_id, ceph_cap_string(issued), seq);
648 spin_lock(&session->s_gen_ttl_lock);
649 gen = session->s_cap_gen;
650 spin_unlock(&session->s_gen_ttl_lock);
652 cap = __get_cap_for_mds(ci, mds);
658 cap->implemented = 0;
664 __insert_cap_node(ci, cap);
666 /* add to session cap list */
667 cap->session = session;
668 spin_lock(&session->s_cap_lock);
669 list_add_tail(&cap->session_caps, &session->s_caps);
670 session->s_nr_caps++;
671 atomic64_inc(&mdsc->metric.total_caps);
672 spin_unlock(&session->s_cap_lock);
674 spin_lock(&session->s_cap_lock);
675 list_move_tail(&cap->session_caps, &session->s_caps);
676 spin_unlock(&session->s_cap_lock);
678 if (cap->cap_gen < gen)
679 cap->issued = cap->implemented = CEPH_CAP_PIN;
682 * auth mds of the inode changed. we received the cap export
683 * message, but still haven't received the cap import message.
684 * handle_cap_export() updated the new auth MDS' cap.
686 * "ceph_seq_cmp(seq, cap->seq) <= 0" means we are processing
687 * a message that was send before the cap import message. So
690 if (ceph_seq_cmp(seq, cap->seq) <= 0) {
691 WARN_ON(cap != ci->i_auth_cap);
692 WARN_ON(cap->cap_id != cap_id);
695 issued |= cap->issued;
696 flags |= CEPH_CAP_FLAG_AUTH;
700 if (!ci->i_snap_realm ||
701 ((flags & CEPH_CAP_FLAG_AUTH) &&
702 realmino != (u64)-1 && ci->i_snap_realm->ino != realmino)) {
704 * add this inode to the appropriate snap realm
706 struct ceph_snap_realm *realm = ceph_lookup_snap_realm(mdsc,
709 struct ceph_snap_realm *oldrealm = ci->i_snap_realm;
711 spin_lock(&oldrealm->inodes_with_caps_lock);
712 list_del_init(&ci->i_snap_realm_item);
713 spin_unlock(&oldrealm->inodes_with_caps_lock);
716 spin_lock(&realm->inodes_with_caps_lock);
717 list_add(&ci->i_snap_realm_item,
718 &realm->inodes_with_caps);
719 ci->i_snap_realm = realm;
720 if (realm->ino == ci->i_vino.ino)
721 realm->inode = inode;
722 spin_unlock(&realm->inodes_with_caps_lock);
725 ceph_put_snap_realm(mdsc, oldrealm);
727 pr_err("ceph_add_cap: couldn't find snap realm %llx\n",
733 __check_cap_issue(ci, cap, issued);
736 * If we are issued caps we don't want, or the mds' wanted
737 * value appears to be off, queue a check so we'll release
738 * later and/or update the mds wanted value.
740 actual_wanted = __ceph_caps_wanted(ci);
741 if ((wanted & ~actual_wanted) ||
742 (issued & ~actual_wanted & CEPH_CAP_ANY_WR)) {
743 dout(" issued %s, mds wanted %s, actual %s, queueing\n",
744 ceph_cap_string(issued), ceph_cap_string(wanted),
745 ceph_cap_string(actual_wanted));
746 __cap_delay_requeue(mdsc, ci);
749 if (flags & CEPH_CAP_FLAG_AUTH) {
750 if (!ci->i_auth_cap ||
751 ceph_seq_cmp(ci->i_auth_cap->mseq, mseq) < 0) {
752 if (ci->i_auth_cap &&
753 ci->i_auth_cap->session != cap->session)
754 change_auth_cap_ses(ci, cap->session);
755 ci->i_auth_cap = cap;
756 cap->mds_wanted = wanted;
759 WARN_ON(ci->i_auth_cap == cap);
762 dout("add_cap inode %p (%llx.%llx) cap %p %s now %s seq %d mds%d\n",
763 inode, ceph_vinop(inode), cap, ceph_cap_string(issued),
764 ceph_cap_string(issued|cap->issued), seq, mds);
765 cap->cap_id = cap_id;
766 cap->issued = issued;
767 cap->implemented |= issued;
768 if (ceph_seq_cmp(mseq, cap->mseq) > 0)
769 cap->mds_wanted = wanted;
771 cap->mds_wanted |= wanted;
773 cap->issue_seq = seq;
779 * Return true if cap has not timed out and belongs to the current
780 * generation of the MDS session (i.e. has not gone 'stale' due to
781 * us losing touch with the mds).
783 static int __cap_is_valid(struct ceph_cap *cap)
788 spin_lock(&cap->session->s_gen_ttl_lock);
789 gen = cap->session->s_cap_gen;
790 ttl = cap->session->s_cap_ttl;
791 spin_unlock(&cap->session->s_gen_ttl_lock);
793 if (cap->cap_gen < gen || time_after_eq(jiffies, ttl)) {
794 dout("__cap_is_valid %p cap %p issued %s "
795 "but STALE (gen %u vs %u)\n", &cap->ci->vfs_inode,
796 cap, ceph_cap_string(cap->issued), cap->cap_gen, gen);
804 * Return set of valid cap bits issued to us. Note that caps time
805 * out, and may be invalidated in bulk if the client session times out
806 * and session->s_cap_gen is bumped.
808 int __ceph_caps_issued(struct ceph_inode_info *ci, int *implemented)
810 int have = ci->i_snap_caps;
811 struct ceph_cap *cap;
816 for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
817 cap = rb_entry(p, struct ceph_cap, ci_node);
818 if (!__cap_is_valid(cap))
820 dout("__ceph_caps_issued %p cap %p issued %s\n",
821 &ci->vfs_inode, cap, ceph_cap_string(cap->issued));
824 *implemented |= cap->implemented;
827 * exclude caps issued by non-auth MDS, but are been revoking
828 * by the auth MDS. The non-auth MDS should be revoking/exporting
829 * these caps, but the message is delayed.
831 if (ci->i_auth_cap) {
832 cap = ci->i_auth_cap;
833 have &= ~cap->implemented | cap->issued;
839 * Get cap bits issued by caps other than @ocap
841 int __ceph_caps_issued_other(struct ceph_inode_info *ci, struct ceph_cap *ocap)
843 int have = ci->i_snap_caps;
844 struct ceph_cap *cap;
847 for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
848 cap = rb_entry(p, struct ceph_cap, ci_node);
851 if (!__cap_is_valid(cap))
859 * Move a cap to the end of the LRU (oldest caps at list head, newest
862 static void __touch_cap(struct ceph_cap *cap)
864 struct ceph_mds_session *s = cap->session;
866 spin_lock(&s->s_cap_lock);
867 if (!s->s_cap_iterator) {
868 dout("__touch_cap %p cap %p mds%d\n", &cap->ci->vfs_inode, cap,
870 list_move_tail(&cap->session_caps, &s->s_caps);
872 dout("__touch_cap %p cap %p mds%d NOP, iterating over caps\n",
873 &cap->ci->vfs_inode, cap, s->s_mds);
875 spin_unlock(&s->s_cap_lock);
879 * Check if we hold the given mask. If so, move the cap(s) to the
880 * front of their respective LRUs. (This is the preferred way for
881 * callers to check for caps they want.)
883 int __ceph_caps_issued_mask(struct ceph_inode_info *ci, int mask, int touch)
885 struct ceph_cap *cap;
887 int have = ci->i_snap_caps;
889 if ((have & mask) == mask) {
890 dout("__ceph_caps_issued_mask ino 0x%lx snap issued %s"
891 " (mask %s)\n", ci->vfs_inode.i_ino,
892 ceph_cap_string(have),
893 ceph_cap_string(mask));
897 for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
898 cap = rb_entry(p, struct ceph_cap, ci_node);
899 if (!__cap_is_valid(cap))
901 if ((cap->issued & mask) == mask) {
902 dout("__ceph_caps_issued_mask ino 0x%lx cap %p issued %s"
903 " (mask %s)\n", ci->vfs_inode.i_ino, cap,
904 ceph_cap_string(cap->issued),
905 ceph_cap_string(mask));
911 /* does a combination of caps satisfy mask? */
913 if ((have & mask) == mask) {
914 dout("__ceph_caps_issued_mask ino 0x%lx combo issued %s"
915 " (mask %s)\n", ci->vfs_inode.i_ino,
916 ceph_cap_string(cap->issued),
917 ceph_cap_string(mask));
921 /* touch this + preceding caps */
923 for (q = rb_first(&ci->i_caps); q != p;
925 cap = rb_entry(q, struct ceph_cap,
927 if (!__cap_is_valid(cap))
929 if (cap->issued & mask)
940 int __ceph_caps_issued_mask_metric(struct ceph_inode_info *ci, int mask,
943 struct ceph_fs_client *fsc = ceph_sb_to_client(ci->vfs_inode.i_sb);
946 r = __ceph_caps_issued_mask(ci, mask, touch);
948 ceph_update_cap_hit(&fsc->mdsc->metric);
950 ceph_update_cap_mis(&fsc->mdsc->metric);
955 * Return true if mask caps are currently being revoked by an MDS.
957 int __ceph_caps_revoking_other(struct ceph_inode_info *ci,
958 struct ceph_cap *ocap, int mask)
960 struct ceph_cap *cap;
963 for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
964 cap = rb_entry(p, struct ceph_cap, ci_node);
966 (cap->implemented & ~cap->issued & mask))
972 int ceph_caps_revoking(struct ceph_inode_info *ci, int mask)
974 struct inode *inode = &ci->vfs_inode;
977 spin_lock(&ci->i_ceph_lock);
978 ret = __ceph_caps_revoking_other(ci, NULL, mask);
979 spin_unlock(&ci->i_ceph_lock);
980 dout("ceph_caps_revoking %p %s = %d\n", inode,
981 ceph_cap_string(mask), ret);
985 int __ceph_caps_used(struct ceph_inode_info *ci)
989 used |= CEPH_CAP_PIN;
991 used |= CEPH_CAP_FILE_RD;
992 if (ci->i_rdcache_ref ||
993 (S_ISREG(ci->vfs_inode.i_mode) &&
994 ci->vfs_inode.i_data.nrpages))
995 used |= CEPH_CAP_FILE_CACHE;
997 used |= CEPH_CAP_FILE_WR;
998 if (ci->i_wb_ref || ci->i_wrbuffer_ref)
999 used |= CEPH_CAP_FILE_BUFFER;
1001 used |= CEPH_CAP_FILE_EXCL;
1005 #define FMODE_WAIT_BIAS 1000
1008 * wanted, by virtue of open file modes
1010 int __ceph_caps_file_wanted(struct ceph_inode_info *ci)
1012 const int PIN_SHIFT = ffs(CEPH_FILE_MODE_PIN);
1013 const int RD_SHIFT = ffs(CEPH_FILE_MODE_RD);
1014 const int WR_SHIFT = ffs(CEPH_FILE_MODE_WR);
1015 const int LAZY_SHIFT = ffs(CEPH_FILE_MODE_LAZY);
1016 struct ceph_mount_options *opt =
1017 ceph_inode_to_client(&ci->vfs_inode)->mount_options;
1018 unsigned long used_cutoff = jiffies - opt->caps_wanted_delay_max * HZ;
1019 unsigned long idle_cutoff = jiffies - opt->caps_wanted_delay_min * HZ;
1021 if (S_ISDIR(ci->vfs_inode.i_mode)) {
1024 /* use used_cutoff here, to keep dir's wanted caps longer */
1025 if (ci->i_nr_by_mode[RD_SHIFT] > 0 ||
1026 time_after(ci->i_last_rd, used_cutoff))
1027 want |= CEPH_CAP_ANY_SHARED;
1029 if (ci->i_nr_by_mode[WR_SHIFT] > 0 ||
1030 time_after(ci->i_last_wr, used_cutoff)) {
1031 want |= CEPH_CAP_ANY_SHARED | CEPH_CAP_FILE_EXCL;
1032 if (opt->flags & CEPH_MOUNT_OPT_ASYNC_DIROPS)
1033 want |= CEPH_CAP_ANY_DIR_OPS;
1036 if (want || ci->i_nr_by_mode[PIN_SHIFT] > 0)
1037 want |= CEPH_CAP_PIN;
1043 if (ci->i_nr_by_mode[RD_SHIFT] > 0) {
1044 if (ci->i_nr_by_mode[RD_SHIFT] >= FMODE_WAIT_BIAS ||
1045 time_after(ci->i_last_rd, used_cutoff))
1046 bits |= 1 << RD_SHIFT;
1047 } else if (time_after(ci->i_last_rd, idle_cutoff)) {
1048 bits |= 1 << RD_SHIFT;
1051 if (ci->i_nr_by_mode[WR_SHIFT] > 0) {
1052 if (ci->i_nr_by_mode[WR_SHIFT] >= FMODE_WAIT_BIAS ||
1053 time_after(ci->i_last_wr, used_cutoff))
1054 bits |= 1 << WR_SHIFT;
1055 } else if (time_after(ci->i_last_wr, idle_cutoff)) {
1056 bits |= 1 << WR_SHIFT;
1059 /* check lazyio only when read/write is wanted */
1060 if ((bits & (CEPH_FILE_MODE_RDWR << 1)) &&
1061 ci->i_nr_by_mode[LAZY_SHIFT] > 0)
1062 bits |= 1 << LAZY_SHIFT;
1064 return bits ? ceph_caps_for_mode(bits >> 1) : 0;
1069 * wanted, by virtue of open file modes AND cap refs (buffered/cached data)
1071 int __ceph_caps_wanted(struct ceph_inode_info *ci)
1073 int w = __ceph_caps_file_wanted(ci) | __ceph_caps_used(ci);
1074 if (S_ISDIR(ci->vfs_inode.i_mode)) {
1075 /* we want EXCL if holding caps of dir ops */
1076 if (w & CEPH_CAP_ANY_DIR_OPS)
1077 w |= CEPH_CAP_FILE_EXCL;
1079 /* we want EXCL if dirty data */
1080 if (w & CEPH_CAP_FILE_BUFFER)
1081 w |= CEPH_CAP_FILE_EXCL;
1087 * Return caps we have registered with the MDS(s) as 'wanted'.
1089 int __ceph_caps_mds_wanted(struct ceph_inode_info *ci, bool check)
1091 struct ceph_cap *cap;
1095 for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
1096 cap = rb_entry(p, struct ceph_cap, ci_node);
1097 if (check && !__cap_is_valid(cap))
1099 if (cap == ci->i_auth_cap)
1100 mds_wanted |= cap->mds_wanted;
1102 mds_wanted |= (cap->mds_wanted & ~CEPH_CAP_ANY_FILE_WR);
1107 int ceph_is_any_caps(struct inode *inode)
1109 struct ceph_inode_info *ci = ceph_inode(inode);
1112 spin_lock(&ci->i_ceph_lock);
1113 ret = __ceph_is_any_real_caps(ci);
1114 spin_unlock(&ci->i_ceph_lock);
1119 static void drop_inode_snap_realm(struct ceph_inode_info *ci)
1121 struct ceph_snap_realm *realm = ci->i_snap_realm;
1122 spin_lock(&realm->inodes_with_caps_lock);
1123 list_del_init(&ci->i_snap_realm_item);
1124 ci->i_snap_realm_counter++;
1125 ci->i_snap_realm = NULL;
1126 if (realm->ino == ci->i_vino.ino)
1127 realm->inode = NULL;
1128 spin_unlock(&realm->inodes_with_caps_lock);
1129 ceph_put_snap_realm(ceph_sb_to_client(ci->vfs_inode.i_sb)->mdsc,
1134 * Remove a cap. Take steps to deal with a racing iterate_session_caps.
1136 * caller should hold i_ceph_lock.
1137 * caller will not hold session s_mutex if called from destroy_inode.
1139 void __ceph_remove_cap(struct ceph_cap *cap, bool queue_release)
1141 struct ceph_mds_session *session = cap->session;
1142 struct ceph_inode_info *ci = cap->ci;
1143 struct ceph_mds_client *mdsc =
1144 ceph_sb_to_client(ci->vfs_inode.i_sb)->mdsc;
1147 dout("__ceph_remove_cap %p from %p\n", cap, &ci->vfs_inode);
1149 /* remove from inode's cap rbtree, and clear auth cap */
1150 rb_erase(&cap->ci_node, &ci->i_caps);
1151 if (ci->i_auth_cap == cap) {
1152 WARN_ON_ONCE(!list_empty(&ci->i_dirty_item));
1153 ci->i_auth_cap = NULL;
1156 /* remove from session list */
1157 spin_lock(&session->s_cap_lock);
1158 if (session->s_cap_iterator == cap) {
1159 /* not yet, we are iterating over this very cap */
1160 dout("__ceph_remove_cap delaying %p removal from session %p\n",
1163 list_del_init(&cap->session_caps);
1164 session->s_nr_caps--;
1165 atomic64_dec(&mdsc->metric.total_caps);
1166 cap->session = NULL;
1169 /* protect backpointer with s_cap_lock: see iterate_session_caps */
1173 * s_cap_reconnect is protected by s_cap_lock. no one changes
1174 * s_cap_gen while session is in the reconnect state.
1176 if (queue_release &&
1177 (!session->s_cap_reconnect || cap->cap_gen == session->s_cap_gen)) {
1178 cap->queue_release = 1;
1180 __ceph_queue_cap_release(session, cap);
1184 cap->queue_release = 0;
1186 cap->cap_ino = ci->i_vino.ino;
1188 spin_unlock(&session->s_cap_lock);
1191 ceph_put_cap(mdsc, cap);
1193 if (!__ceph_is_any_real_caps(ci)) {
1194 /* when reconnect denied, we remove session caps forcibly,
1195 * i_wr_ref can be non-zero. If there are ongoing write,
1196 * keep i_snap_realm.
1198 if (ci->i_wr_ref == 0 && ci->i_snap_realm)
1199 drop_inode_snap_realm(ci);
1201 __cap_delay_cancel(mdsc, ci);
1205 struct cap_msg_args {
1206 struct ceph_mds_session *session;
1207 u64 ino, cid, follows;
1208 u64 flush_tid, oldest_flush_tid, size, max_size;
1211 struct ceph_buffer *xattr_buf;
1212 struct ceph_buffer *old_xattr_buf;
1213 struct timespec64 atime, mtime, ctime, btime;
1214 int op, caps, wanted, dirty;
1215 u32 seq, issue_seq, mseq, time_warp_seq;
1225 * Build and send a cap message to the given MDS.
1227 * Caller should be holding s_mutex.
1229 static int send_cap_msg(struct cap_msg_args *arg)
1231 struct ceph_mds_caps *fc;
1232 struct ceph_msg *msg;
1235 struct ceph_osd_client *osdc = &arg->session->s_mdsc->fsc->client->osdc;
1237 dout("send_cap_msg %s %llx %llx caps %s wanted %s dirty %s"
1238 " seq %u/%u tid %llu/%llu mseq %u follows %lld size %llu/%llu"
1239 " xattr_ver %llu xattr_len %d\n", ceph_cap_op_name(arg->op),
1240 arg->cid, arg->ino, ceph_cap_string(arg->caps),
1241 ceph_cap_string(arg->wanted), ceph_cap_string(arg->dirty),
1242 arg->seq, arg->issue_seq, arg->flush_tid, arg->oldest_flush_tid,
1243 arg->mseq, arg->follows, arg->size, arg->max_size,
1245 arg->xattr_buf ? (int)arg->xattr_buf->vec.iov_len : 0);
1247 /* flock buffer size + inline version + inline data size +
1248 * osd_epoch_barrier + oldest_flush_tid */
1249 extra_len = 4 + 8 + 4 + 4 + 8 + 4 + 4 + 4 + 8 + 8 + 4;
1250 msg = ceph_msg_new(CEPH_MSG_CLIENT_CAPS, sizeof(*fc) + extra_len,
1255 msg->hdr.version = cpu_to_le16(10);
1256 msg->hdr.tid = cpu_to_le64(arg->flush_tid);
1258 fc = msg->front.iov_base;
1259 memset(fc, 0, sizeof(*fc));
1261 fc->cap_id = cpu_to_le64(arg->cid);
1262 fc->op = cpu_to_le32(arg->op);
1263 fc->seq = cpu_to_le32(arg->seq);
1264 fc->issue_seq = cpu_to_le32(arg->issue_seq);
1265 fc->migrate_seq = cpu_to_le32(arg->mseq);
1266 fc->caps = cpu_to_le32(arg->caps);
1267 fc->wanted = cpu_to_le32(arg->wanted);
1268 fc->dirty = cpu_to_le32(arg->dirty);
1269 fc->ino = cpu_to_le64(arg->ino);
1270 fc->snap_follows = cpu_to_le64(arg->follows);
1272 fc->size = cpu_to_le64(arg->size);
1273 fc->max_size = cpu_to_le64(arg->max_size);
1274 ceph_encode_timespec64(&fc->mtime, &arg->mtime);
1275 ceph_encode_timespec64(&fc->atime, &arg->atime);
1276 ceph_encode_timespec64(&fc->ctime, &arg->ctime);
1277 fc->time_warp_seq = cpu_to_le32(arg->time_warp_seq);
1279 fc->uid = cpu_to_le32(from_kuid(&init_user_ns, arg->uid));
1280 fc->gid = cpu_to_le32(from_kgid(&init_user_ns, arg->gid));
1281 fc->mode = cpu_to_le32(arg->mode);
1283 fc->xattr_version = cpu_to_le64(arg->xattr_version);
1284 if (arg->xattr_buf) {
1285 msg->middle = ceph_buffer_get(arg->xattr_buf);
1286 fc->xattr_len = cpu_to_le32(arg->xattr_buf->vec.iov_len);
1287 msg->hdr.middle_len = cpu_to_le32(arg->xattr_buf->vec.iov_len);
1291 /* flock buffer size (version 2) */
1292 ceph_encode_32(&p, 0);
1293 /* inline version (version 4) */
1294 ceph_encode_64(&p, arg->inline_data ? 0 : CEPH_INLINE_NONE);
1295 /* inline data size */
1296 ceph_encode_32(&p, 0);
1298 * osd_epoch_barrier (version 5)
1299 * The epoch_barrier is protected osdc->lock, so READ_ONCE here in
1300 * case it was recently changed
1302 ceph_encode_32(&p, READ_ONCE(osdc->epoch_barrier));
1303 /* oldest_flush_tid (version 6) */
1304 ceph_encode_64(&p, arg->oldest_flush_tid);
1307 * caller_uid/caller_gid (version 7)
1309 * Currently, we don't properly track which caller dirtied the caps
1310 * last, and force a flush of them when there is a conflict. For now,
1311 * just set this to 0:0, to emulate how the MDS has worked up to now.
1313 ceph_encode_32(&p, 0);
1314 ceph_encode_32(&p, 0);
1316 /* pool namespace (version 8) (mds always ignores this) */
1317 ceph_encode_32(&p, 0);
1319 /* btime and change_attr (version 9) */
1320 ceph_encode_timespec64(p, &arg->btime);
1321 p += sizeof(struct ceph_timespec);
1322 ceph_encode_64(&p, arg->change_attr);
1324 /* Advisory flags (version 10) */
1325 ceph_encode_32(&p, arg->flags);
1327 ceph_con_send(&arg->session->s_con, msg);
1332 * Queue cap releases when an inode is dropped from our cache.
1334 void __ceph_remove_caps(struct ceph_inode_info *ci)
1338 /* lock i_ceph_lock, because ceph_d_revalidate(..., LOOKUP_RCU)
1339 * may call __ceph_caps_issued_mask() on a freeing inode. */
1340 spin_lock(&ci->i_ceph_lock);
1341 p = rb_first(&ci->i_caps);
1343 struct ceph_cap *cap = rb_entry(p, struct ceph_cap, ci_node);
1345 __ceph_remove_cap(cap, true);
1347 spin_unlock(&ci->i_ceph_lock);
1351 * Prepare to send a cap message to an MDS. Update the cap state, and populate
1352 * the arg struct with the parameters that will need to be sent. This should
1353 * be done under the i_ceph_lock to guard against changes to cap state.
1355 * Make note of max_size reported/requested from mds, revoked caps
1356 * that have now been implemented.
1358 static void __prep_cap(struct cap_msg_args *arg, struct ceph_cap *cap,
1359 int op, int flags, int used, int want, int retain,
1360 int flushing, u64 flush_tid, u64 oldest_flush_tid)
1362 struct ceph_inode_info *ci = cap->ci;
1363 struct inode *inode = &ci->vfs_inode;
1366 lockdep_assert_held(&ci->i_ceph_lock);
1368 held = cap->issued | cap->implemented;
1369 revoking = cap->implemented & ~cap->issued;
1370 retain &= ~revoking;
1372 dout("%s %p cap %p session %p %s -> %s (revoking %s)\n",
1373 __func__, inode, cap, cap->session,
1374 ceph_cap_string(held), ceph_cap_string(held & retain),
1375 ceph_cap_string(revoking));
1376 BUG_ON((retain & CEPH_CAP_PIN) == 0);
1378 ci->i_ceph_flags &= ~CEPH_I_FLUSH;
1380 cap->issued &= retain; /* drop bits we don't want */
1382 * Wake up any waiters on wanted -> needed transition. This is due to
1383 * the weird transition from buffered to sync IO... we need to flush
1384 * dirty pages _before_ allowing sync writes to avoid reordering.
1386 arg->wake = cap->implemented & ~cap->issued;
1387 cap->implemented &= cap->issued | used;
1388 cap->mds_wanted = want;
1390 arg->session = cap->session;
1391 arg->ino = ceph_vino(inode).ino;
1392 arg->cid = cap->cap_id;
1393 arg->follows = flushing ? ci->i_head_snapc->seq : 0;
1394 arg->flush_tid = flush_tid;
1395 arg->oldest_flush_tid = oldest_flush_tid;
1397 arg->size = inode->i_size;
1398 ci->i_reported_size = arg->size;
1399 arg->max_size = ci->i_wanted_max_size;
1400 if (cap == ci->i_auth_cap) {
1401 if (want & CEPH_CAP_ANY_FILE_WR)
1402 ci->i_requested_max_size = arg->max_size;
1404 ci->i_requested_max_size = 0;
1407 if (flushing & CEPH_CAP_XATTR_EXCL) {
1408 arg->old_xattr_buf = __ceph_build_xattrs_blob(ci);
1409 arg->xattr_version = ci->i_xattrs.version;
1410 arg->xattr_buf = ci->i_xattrs.blob;
1412 arg->xattr_buf = NULL;
1413 arg->old_xattr_buf = NULL;
1416 arg->mtime = inode->i_mtime;
1417 arg->atime = inode->i_atime;
1418 arg->ctime = inode->i_ctime;
1419 arg->btime = ci->i_btime;
1420 arg->change_attr = inode_peek_iversion_raw(inode);
1423 arg->caps = cap->implemented;
1425 arg->dirty = flushing;
1427 arg->seq = cap->seq;
1428 arg->issue_seq = cap->issue_seq;
1429 arg->mseq = cap->mseq;
1430 arg->time_warp_seq = ci->i_time_warp_seq;
1432 arg->uid = inode->i_uid;
1433 arg->gid = inode->i_gid;
1434 arg->mode = inode->i_mode;
1436 arg->inline_data = ci->i_inline_version != CEPH_INLINE_NONE;
1437 if (!(flags & CEPH_CLIENT_CAPS_PENDING_CAPSNAP) &&
1438 !list_empty(&ci->i_cap_snaps)) {
1439 struct ceph_cap_snap *capsnap;
1440 list_for_each_entry_reverse(capsnap, &ci->i_cap_snaps, ci_item) {
1441 if (capsnap->cap_flush.tid)
1443 if (capsnap->need_flush) {
1444 flags |= CEPH_CLIENT_CAPS_PENDING_CAPSNAP;
1453 * Send a cap msg on the given inode.
1455 * Caller should hold snap_rwsem (read), s_mutex.
1457 static void __send_cap(struct ceph_mds_client *mdsc, struct cap_msg_args *arg,
1458 struct ceph_inode_info *ci)
1460 struct inode *inode = &ci->vfs_inode;
1463 ret = send_cap_msg(arg);
1465 pr_err("error sending cap msg, ino (%llx.%llx) "
1466 "flushing %s tid %llu, requeue\n",
1467 ceph_vinop(inode), ceph_cap_string(arg->dirty),
1469 spin_lock(&ci->i_ceph_lock);
1470 __cap_delay_requeue(mdsc, ci);
1471 spin_unlock(&ci->i_ceph_lock);
1474 ceph_buffer_put(arg->old_xattr_buf);
1477 wake_up_all(&ci->i_cap_wq);
1480 static inline int __send_flush_snap(struct inode *inode,
1481 struct ceph_mds_session *session,
1482 struct ceph_cap_snap *capsnap,
1483 u32 mseq, u64 oldest_flush_tid)
1485 struct cap_msg_args arg;
1487 arg.session = session;
1488 arg.ino = ceph_vino(inode).ino;
1490 arg.follows = capsnap->follows;
1491 arg.flush_tid = capsnap->cap_flush.tid;
1492 arg.oldest_flush_tid = oldest_flush_tid;
1494 arg.size = capsnap->size;
1496 arg.xattr_version = capsnap->xattr_version;
1497 arg.xattr_buf = capsnap->xattr_blob;
1498 arg.old_xattr_buf = NULL;
1500 arg.atime = capsnap->atime;
1501 arg.mtime = capsnap->mtime;
1502 arg.ctime = capsnap->ctime;
1503 arg.btime = capsnap->btime;
1504 arg.change_attr = capsnap->change_attr;
1506 arg.op = CEPH_CAP_OP_FLUSHSNAP;
1507 arg.caps = capsnap->issued;
1509 arg.dirty = capsnap->dirty;
1514 arg.time_warp_seq = capsnap->time_warp_seq;
1516 arg.uid = capsnap->uid;
1517 arg.gid = capsnap->gid;
1518 arg.mode = capsnap->mode;
1520 arg.inline_data = capsnap->inline_data;
1524 return send_cap_msg(&arg);
1528 * When a snapshot is taken, clients accumulate dirty metadata on
1529 * inodes with capabilities in ceph_cap_snaps to describe the file
1530 * state at the time the snapshot was taken. This must be flushed
1531 * asynchronously back to the MDS once sync writes complete and dirty
1532 * data is written out.
1534 * Called under i_ceph_lock. Takes s_mutex as needed.
1536 static void __ceph_flush_snaps(struct ceph_inode_info *ci,
1537 struct ceph_mds_session *session)
1538 __releases(ci->i_ceph_lock)
1539 __acquires(ci->i_ceph_lock)
1541 struct inode *inode = &ci->vfs_inode;
1542 struct ceph_mds_client *mdsc = session->s_mdsc;
1543 struct ceph_cap_snap *capsnap;
1544 u64 oldest_flush_tid = 0;
1545 u64 first_tid = 1, last_tid = 0;
1547 dout("__flush_snaps %p session %p\n", inode, session);
1549 list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) {
1551 * we need to wait for sync writes to complete and for dirty
1552 * pages to be written out.
1554 if (capsnap->dirty_pages || capsnap->writing)
1557 /* should be removed by ceph_try_drop_cap_snap() */
1558 BUG_ON(!capsnap->need_flush);
1560 /* only flush each capsnap once */
1561 if (capsnap->cap_flush.tid > 0) {
1562 dout(" already flushed %p, skipping\n", capsnap);
1566 spin_lock(&mdsc->cap_dirty_lock);
1567 capsnap->cap_flush.tid = ++mdsc->last_cap_flush_tid;
1568 list_add_tail(&capsnap->cap_flush.g_list,
1569 &mdsc->cap_flush_list);
1570 if (oldest_flush_tid == 0)
1571 oldest_flush_tid = __get_oldest_flush_tid(mdsc);
1572 if (list_empty(&ci->i_flushing_item)) {
1573 list_add_tail(&ci->i_flushing_item,
1574 &session->s_cap_flushing);
1576 spin_unlock(&mdsc->cap_dirty_lock);
1578 list_add_tail(&capsnap->cap_flush.i_list,
1579 &ci->i_cap_flush_list);
1582 first_tid = capsnap->cap_flush.tid;
1583 last_tid = capsnap->cap_flush.tid;
1586 ci->i_ceph_flags &= ~CEPH_I_FLUSH_SNAPS;
1588 while (first_tid <= last_tid) {
1589 struct ceph_cap *cap = ci->i_auth_cap;
1590 struct ceph_cap_flush *cf;
1593 if (!(cap && cap->session == session)) {
1594 dout("__flush_snaps %p auth cap %p not mds%d, "
1595 "stop\n", inode, cap, session->s_mds);
1600 list_for_each_entry(cf, &ci->i_cap_flush_list, i_list) {
1601 if (cf->tid >= first_tid) {
1609 first_tid = cf->tid + 1;
1611 capsnap = container_of(cf, struct ceph_cap_snap, cap_flush);
1612 refcount_inc(&capsnap->nref);
1613 spin_unlock(&ci->i_ceph_lock);
1615 dout("__flush_snaps %p capsnap %p tid %llu %s\n",
1616 inode, capsnap, cf->tid, ceph_cap_string(capsnap->dirty));
1618 ret = __send_flush_snap(inode, session, capsnap, cap->mseq,
1621 pr_err("__flush_snaps: error sending cap flushsnap, "
1622 "ino (%llx.%llx) tid %llu follows %llu\n",
1623 ceph_vinop(inode), cf->tid, capsnap->follows);
1626 ceph_put_cap_snap(capsnap);
1627 spin_lock(&ci->i_ceph_lock);
1631 void ceph_flush_snaps(struct ceph_inode_info *ci,
1632 struct ceph_mds_session **psession)
1634 struct inode *inode = &ci->vfs_inode;
1635 struct ceph_mds_client *mdsc = ceph_inode_to_client(inode)->mdsc;
1636 struct ceph_mds_session *session = NULL;
1639 dout("ceph_flush_snaps %p\n", inode);
1641 session = *psession;
1643 spin_lock(&ci->i_ceph_lock);
1644 if (!(ci->i_ceph_flags & CEPH_I_FLUSH_SNAPS)) {
1645 dout(" no capsnap needs flush, doing nothing\n");
1648 if (!ci->i_auth_cap) {
1649 dout(" no auth cap (migrating?), doing nothing\n");
1653 mds = ci->i_auth_cap->session->s_mds;
1654 if (session && session->s_mds != mds) {
1655 dout(" oops, wrong session %p mutex\n", session);
1656 mutex_unlock(&session->s_mutex);
1657 ceph_put_mds_session(session);
1661 spin_unlock(&ci->i_ceph_lock);
1662 mutex_lock(&mdsc->mutex);
1663 session = __ceph_lookup_mds_session(mdsc, mds);
1664 mutex_unlock(&mdsc->mutex);
1666 dout(" inverting session/ino locks on %p\n", session);
1667 mutex_lock(&session->s_mutex);
1672 // make sure flushsnap messages are sent in proper order.
1673 if (ci->i_ceph_flags & CEPH_I_KICK_FLUSH)
1674 __kick_flushing_caps(mdsc, session, ci, 0);
1676 __ceph_flush_snaps(ci, session);
1678 spin_unlock(&ci->i_ceph_lock);
1681 *psession = session;
1682 } else if (session) {
1683 mutex_unlock(&session->s_mutex);
1684 ceph_put_mds_session(session);
1686 /* we flushed them all; remove this inode from the queue */
1687 spin_lock(&mdsc->snap_flush_lock);
1688 list_del_init(&ci->i_snap_flush_item);
1689 spin_unlock(&mdsc->snap_flush_lock);
1693 * Mark caps dirty. If inode is newly dirty, return the dirty flags.
1694 * Caller is then responsible for calling __mark_inode_dirty with the
1695 * returned flags value.
1697 int __ceph_mark_dirty_caps(struct ceph_inode_info *ci, int mask,
1698 struct ceph_cap_flush **pcf)
1700 struct ceph_mds_client *mdsc =
1701 ceph_sb_to_client(ci->vfs_inode.i_sb)->mdsc;
1702 struct inode *inode = &ci->vfs_inode;
1703 int was = ci->i_dirty_caps;
1706 lockdep_assert_held(&ci->i_ceph_lock);
1708 if (!ci->i_auth_cap) {
1709 pr_warn("__mark_dirty_caps %p %llx mask %s, "
1710 "but no auth cap (session was closed?)\n",
1711 inode, ceph_ino(inode), ceph_cap_string(mask));
1715 dout("__mark_dirty_caps %p %s dirty %s -> %s\n", &ci->vfs_inode,
1716 ceph_cap_string(mask), ceph_cap_string(was),
1717 ceph_cap_string(was | mask));
1718 ci->i_dirty_caps |= mask;
1720 struct ceph_mds_session *session = ci->i_auth_cap->session;
1722 WARN_ON_ONCE(ci->i_prealloc_cap_flush);
1723 swap(ci->i_prealloc_cap_flush, *pcf);
1725 if (!ci->i_head_snapc) {
1726 WARN_ON_ONCE(!rwsem_is_locked(&mdsc->snap_rwsem));
1727 ci->i_head_snapc = ceph_get_snap_context(
1728 ci->i_snap_realm->cached_context);
1730 dout(" inode %p now dirty snapc %p auth cap %p\n",
1731 &ci->vfs_inode, ci->i_head_snapc, ci->i_auth_cap);
1732 BUG_ON(!list_empty(&ci->i_dirty_item));
1733 spin_lock(&mdsc->cap_dirty_lock);
1734 list_add(&ci->i_dirty_item, &session->s_cap_dirty);
1735 spin_unlock(&mdsc->cap_dirty_lock);
1736 if (ci->i_flushing_caps == 0) {
1738 dirty |= I_DIRTY_SYNC;
1741 WARN_ON_ONCE(!ci->i_prealloc_cap_flush);
1743 BUG_ON(list_empty(&ci->i_dirty_item));
1744 if (((was | ci->i_flushing_caps) & CEPH_CAP_FILE_BUFFER) &&
1745 (mask & CEPH_CAP_FILE_BUFFER))
1746 dirty |= I_DIRTY_DATASYNC;
1747 __cap_delay_requeue(mdsc, ci);
1751 struct ceph_cap_flush *ceph_alloc_cap_flush(void)
1753 return kmem_cache_alloc(ceph_cap_flush_cachep, GFP_KERNEL);
1756 void ceph_free_cap_flush(struct ceph_cap_flush *cf)
1759 kmem_cache_free(ceph_cap_flush_cachep, cf);
1762 static u64 __get_oldest_flush_tid(struct ceph_mds_client *mdsc)
1764 if (!list_empty(&mdsc->cap_flush_list)) {
1765 struct ceph_cap_flush *cf =
1766 list_first_entry(&mdsc->cap_flush_list,
1767 struct ceph_cap_flush, g_list);
1774 * Remove cap_flush from the mdsc's or inode's flushing cap list.
1775 * Return true if caller needs to wake up flush waiters.
1777 static bool __detach_cap_flush_from_mdsc(struct ceph_mds_client *mdsc,
1778 struct ceph_cap_flush *cf)
1780 struct ceph_cap_flush *prev;
1781 bool wake = cf->wake;
1783 if (wake && cf->g_list.prev != &mdsc->cap_flush_list) {
1784 prev = list_prev_entry(cf, g_list);
1788 list_del(&cf->g_list);
1792 static bool __detach_cap_flush_from_ci(struct ceph_inode_info *ci,
1793 struct ceph_cap_flush *cf)
1795 struct ceph_cap_flush *prev;
1796 bool wake = cf->wake;
1798 if (wake && cf->i_list.prev != &ci->i_cap_flush_list) {
1799 prev = list_prev_entry(cf, i_list);
1803 list_del(&cf->i_list);
1808 * Add dirty inode to the flushing list. Assigned a seq number so we
1809 * can wait for caps to flush without starving.
1811 * Called under i_ceph_lock. Returns the flush tid.
1813 static u64 __mark_caps_flushing(struct inode *inode,
1814 struct ceph_mds_session *session, bool wake,
1815 u64 *oldest_flush_tid)
1817 struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
1818 struct ceph_inode_info *ci = ceph_inode(inode);
1819 struct ceph_cap_flush *cf = NULL;
1822 lockdep_assert_held(&ci->i_ceph_lock);
1823 BUG_ON(ci->i_dirty_caps == 0);
1824 BUG_ON(list_empty(&ci->i_dirty_item));
1825 BUG_ON(!ci->i_prealloc_cap_flush);
1827 flushing = ci->i_dirty_caps;
1828 dout("__mark_caps_flushing flushing %s, flushing_caps %s -> %s\n",
1829 ceph_cap_string(flushing),
1830 ceph_cap_string(ci->i_flushing_caps),
1831 ceph_cap_string(ci->i_flushing_caps | flushing));
1832 ci->i_flushing_caps |= flushing;
1833 ci->i_dirty_caps = 0;
1834 dout(" inode %p now !dirty\n", inode);
1836 swap(cf, ci->i_prealloc_cap_flush);
1837 cf->caps = flushing;
1840 spin_lock(&mdsc->cap_dirty_lock);
1841 list_del_init(&ci->i_dirty_item);
1843 cf->tid = ++mdsc->last_cap_flush_tid;
1844 list_add_tail(&cf->g_list, &mdsc->cap_flush_list);
1845 *oldest_flush_tid = __get_oldest_flush_tid(mdsc);
1847 if (list_empty(&ci->i_flushing_item)) {
1848 list_add_tail(&ci->i_flushing_item, &session->s_cap_flushing);
1849 mdsc->num_cap_flushing++;
1851 spin_unlock(&mdsc->cap_dirty_lock);
1853 list_add_tail(&cf->i_list, &ci->i_cap_flush_list);
1859 * try to invalidate mapping pages without blocking.
1861 static int try_nonblocking_invalidate(struct inode *inode)
1863 struct ceph_inode_info *ci = ceph_inode(inode);
1864 u32 invalidating_gen = ci->i_rdcache_gen;
1866 spin_unlock(&ci->i_ceph_lock);
1867 invalidate_mapping_pages(&inode->i_data, 0, -1);
1868 spin_lock(&ci->i_ceph_lock);
1870 if (inode->i_data.nrpages == 0 &&
1871 invalidating_gen == ci->i_rdcache_gen) {
1873 dout("try_nonblocking_invalidate %p success\n", inode);
1874 /* save any racing async invalidate some trouble */
1875 ci->i_rdcache_revoking = ci->i_rdcache_gen - 1;
1878 dout("try_nonblocking_invalidate %p failed\n", inode);
1882 bool __ceph_should_report_size(struct ceph_inode_info *ci)
1884 loff_t size = ci->vfs_inode.i_size;
1885 /* mds will adjust max size according to the reported size */
1886 if (ci->i_flushing_caps & CEPH_CAP_FILE_WR)
1888 if (size >= ci->i_max_size)
1890 /* half of previous max_size increment has been used */
1891 if (ci->i_max_size > ci->i_reported_size &&
1892 (size << 1) >= ci->i_max_size + ci->i_reported_size)
1898 * Swiss army knife function to examine currently used and wanted
1899 * versus held caps. Release, flush, ack revoked caps to mds as
1902 * CHECK_CAPS_AUTHONLY - we should only check the auth cap
1903 * CHECK_CAPS_FLUSH - we should flush any dirty caps immediately, without
1906 void ceph_check_caps(struct ceph_inode_info *ci, int flags,
1907 struct ceph_mds_session *session)
1909 struct ceph_fs_client *fsc = ceph_inode_to_client(&ci->vfs_inode);
1910 struct ceph_mds_client *mdsc = fsc->mdsc;
1911 struct inode *inode = &ci->vfs_inode;
1912 struct ceph_cap *cap;
1913 u64 flush_tid, oldest_flush_tid;
1914 int file_wanted, used, cap_used;
1915 int took_snap_rwsem = 0; /* true if mdsc->snap_rwsem held */
1916 int issued, implemented, want, retain, revoking, flushing = 0;
1917 int mds = -1; /* keep track of how far we've gone through i_caps list
1918 to avoid an infinite loop on retry */
1920 bool queue_invalidate = false;
1921 bool tried_invalidate = false;
1923 spin_lock(&ci->i_ceph_lock);
1924 if (ci->i_ceph_flags & CEPH_I_FLUSH)
1925 flags |= CHECK_CAPS_FLUSH;
1929 spin_lock(&ci->i_ceph_lock);
1931 file_wanted = __ceph_caps_file_wanted(ci);
1932 used = __ceph_caps_used(ci);
1933 issued = __ceph_caps_issued(ci, &implemented);
1934 revoking = implemented & ~issued;
1937 retain = file_wanted | used | CEPH_CAP_PIN;
1938 if (!mdsc->stopping && inode->i_nlink > 0) {
1940 retain |= CEPH_CAP_ANY; /* be greedy */
1941 } else if (S_ISDIR(inode->i_mode) &&
1942 (issued & CEPH_CAP_FILE_SHARED) &&
1943 __ceph_dir_is_complete(ci)) {
1945 * If a directory is complete, we want to keep
1946 * the exclusive cap. So that MDS does not end up
1947 * revoking the shared cap on every create/unlink
1950 if (IS_RDONLY(inode)) {
1951 want = CEPH_CAP_ANY_SHARED;
1953 want |= CEPH_CAP_ANY_SHARED | CEPH_CAP_FILE_EXCL;
1958 retain |= CEPH_CAP_ANY_SHARED;
1960 * keep RD only if we didn't have the file open RW,
1961 * because then the mds would revoke it anyway to
1962 * journal max_size=0.
1964 if (ci->i_max_size == 0)
1965 retain |= CEPH_CAP_ANY_RD;
1969 dout("check_caps %p file_want %s used %s dirty %s flushing %s"
1970 " issued %s revoking %s retain %s %s%s\n", inode,
1971 ceph_cap_string(file_wanted),
1972 ceph_cap_string(used), ceph_cap_string(ci->i_dirty_caps),
1973 ceph_cap_string(ci->i_flushing_caps),
1974 ceph_cap_string(issued), ceph_cap_string(revoking),
1975 ceph_cap_string(retain),
1976 (flags & CHECK_CAPS_AUTHONLY) ? " AUTHONLY" : "",
1977 (flags & CHECK_CAPS_FLUSH) ? " FLUSH" : "");
1980 * If we no longer need to hold onto old our caps, and we may
1981 * have cached pages, but don't want them, then try to invalidate.
1982 * If we fail, it's because pages are locked.... try again later.
1984 if ((!(flags & CHECK_CAPS_NOINVAL) || mdsc->stopping) &&
1985 S_ISREG(inode->i_mode) &&
1986 !(ci->i_wb_ref || ci->i_wrbuffer_ref) && /* no dirty pages... */
1987 inode->i_data.nrpages && /* have cached pages */
1988 (revoking & (CEPH_CAP_FILE_CACHE|
1989 CEPH_CAP_FILE_LAZYIO)) && /* or revoking cache */
1990 !tried_invalidate) {
1991 dout("check_caps trying to invalidate on %p\n", inode);
1992 if (try_nonblocking_invalidate(inode) < 0) {
1993 dout("check_caps queuing invalidate\n");
1994 queue_invalidate = true;
1995 ci->i_rdcache_revoking = ci->i_rdcache_gen;
1997 tried_invalidate = true;
2001 for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
2003 struct cap_msg_args arg;
2005 cap = rb_entry(p, struct ceph_cap, ci_node);
2007 /* avoid looping forever */
2008 if (mds >= cap->mds ||
2009 ((flags & CHECK_CAPS_AUTHONLY) && cap != ci->i_auth_cap))
2012 /* NOTE: no side-effects allowed, until we take s_mutex */
2015 if (ci->i_auth_cap && cap != ci->i_auth_cap)
2016 cap_used &= ~ci->i_auth_cap->issued;
2018 revoking = cap->implemented & ~cap->issued;
2019 dout(" mds%d cap %p used %s issued %s implemented %s revoking %s\n",
2020 cap->mds, cap, ceph_cap_string(cap_used),
2021 ceph_cap_string(cap->issued),
2022 ceph_cap_string(cap->implemented),
2023 ceph_cap_string(revoking));
2025 if (cap == ci->i_auth_cap &&
2026 (cap->issued & CEPH_CAP_FILE_WR)) {
2027 /* request larger max_size from MDS? */
2028 if (ci->i_wanted_max_size > ci->i_max_size &&
2029 ci->i_wanted_max_size > ci->i_requested_max_size) {
2030 dout("requesting new max_size\n");
2034 /* approaching file_max? */
2035 if (__ceph_should_report_size(ci)) {
2036 dout("i_size approaching max_size\n");
2040 /* flush anything dirty? */
2041 if (cap == ci->i_auth_cap) {
2042 if ((flags & CHECK_CAPS_FLUSH) && ci->i_dirty_caps) {
2043 dout("flushing dirty caps\n");
2046 if (ci->i_ceph_flags & CEPH_I_FLUSH_SNAPS) {
2047 dout("flushing snap caps\n");
2052 /* completed revocation? going down and there are no caps? */
2053 if (revoking && (revoking & cap_used) == 0) {
2054 dout("completed revocation of %s\n",
2055 ceph_cap_string(cap->implemented & ~cap->issued));
2059 /* want more caps from mds? */
2060 if (want & ~cap->mds_wanted) {
2061 if (want & ~(cap->mds_wanted | cap->issued))
2063 if (!__cap_is_valid(cap))
2067 /* things we might delay */
2068 if ((cap->issued & ~retain) == 0)
2069 continue; /* nope, all good */
2072 if (session && session != cap->session) {
2073 dout("oops, wrong session %p mutex\n", session);
2074 mutex_unlock(&session->s_mutex);
2078 session = cap->session;
2079 if (mutex_trylock(&session->s_mutex) == 0) {
2080 dout("inverting session/ino locks on %p\n",
2082 session = ceph_get_mds_session(session);
2083 spin_unlock(&ci->i_ceph_lock);
2084 if (took_snap_rwsem) {
2085 up_read(&mdsc->snap_rwsem);
2086 took_snap_rwsem = 0;
2089 mutex_lock(&session->s_mutex);
2090 ceph_put_mds_session(session);
2093 * Because we take the reference while
2094 * holding the i_ceph_lock, it should
2095 * never be NULL. Throw a warning if it
2104 /* kick flushing and flush snaps before sending normal
2106 if (cap == ci->i_auth_cap &&
2108 (CEPH_I_KICK_FLUSH | CEPH_I_FLUSH_SNAPS))) {
2109 if (ci->i_ceph_flags & CEPH_I_KICK_FLUSH)
2110 __kick_flushing_caps(mdsc, session, ci, 0);
2111 if (ci->i_ceph_flags & CEPH_I_FLUSH_SNAPS)
2112 __ceph_flush_snaps(ci, session);
2117 /* take snap_rwsem after session mutex */
2118 if (!took_snap_rwsem) {
2119 if (down_read_trylock(&mdsc->snap_rwsem) == 0) {
2120 dout("inverting snap/in locks on %p\n",
2122 spin_unlock(&ci->i_ceph_lock);
2123 down_read(&mdsc->snap_rwsem);
2124 took_snap_rwsem = 1;
2127 took_snap_rwsem = 1;
2130 if (cap == ci->i_auth_cap && ci->i_dirty_caps) {
2131 flushing = ci->i_dirty_caps;
2132 flush_tid = __mark_caps_flushing(inode, session, false,
2134 if (flags & CHECK_CAPS_FLUSH &&
2135 list_empty(&session->s_cap_dirty))
2136 mflags |= CEPH_CLIENT_CAPS_SYNC;
2140 spin_lock(&mdsc->cap_dirty_lock);
2141 oldest_flush_tid = __get_oldest_flush_tid(mdsc);
2142 spin_unlock(&mdsc->cap_dirty_lock);
2145 mds = cap->mds; /* remember mds, so we don't repeat */
2147 __prep_cap(&arg, cap, CEPH_CAP_OP_UPDATE, mflags, cap_used,
2148 want, retain, flushing, flush_tid, oldest_flush_tid);
2149 spin_unlock(&ci->i_ceph_lock);
2151 __send_cap(mdsc, &arg, ci);
2153 goto retry; /* retake i_ceph_lock and restart our cap scan. */
2156 /* periodically re-calculate caps wanted by open files */
2157 if (__ceph_is_any_real_caps(ci) &&
2158 list_empty(&ci->i_cap_delay_list) &&
2159 (file_wanted & ~CEPH_CAP_PIN) &&
2160 !(used & (CEPH_CAP_FILE_RD | CEPH_CAP_ANY_FILE_WR))) {
2161 __cap_delay_requeue(mdsc, ci);
2164 spin_unlock(&ci->i_ceph_lock);
2166 if (queue_invalidate)
2167 ceph_queue_invalidate(inode);
2170 mutex_unlock(&session->s_mutex);
2171 if (took_snap_rwsem)
2172 up_read(&mdsc->snap_rwsem);
2176 * Try to flush dirty caps back to the auth mds.
2178 static int try_flush_caps(struct inode *inode, u64 *ptid)
2180 struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
2181 struct ceph_inode_info *ci = ceph_inode(inode);
2182 struct ceph_mds_session *session = NULL;
2184 u64 flush_tid = 0, oldest_flush_tid = 0;
2187 spin_lock(&ci->i_ceph_lock);
2189 if (ci->i_dirty_caps && ci->i_auth_cap) {
2190 struct ceph_cap *cap = ci->i_auth_cap;
2191 struct cap_msg_args arg;
2193 if (session != cap->session) {
2194 spin_unlock(&ci->i_ceph_lock);
2196 mutex_unlock(&session->s_mutex);
2197 session = cap->session;
2198 mutex_lock(&session->s_mutex);
2201 if (cap->session->s_state < CEPH_MDS_SESSION_OPEN) {
2202 spin_unlock(&ci->i_ceph_lock);
2206 if (ci->i_ceph_flags &
2207 (CEPH_I_KICK_FLUSH | CEPH_I_FLUSH_SNAPS)) {
2208 if (ci->i_ceph_flags & CEPH_I_KICK_FLUSH)
2209 __kick_flushing_caps(mdsc, session, ci, 0);
2210 if (ci->i_ceph_flags & CEPH_I_FLUSH_SNAPS)
2211 __ceph_flush_snaps(ci, session);
2215 flushing = ci->i_dirty_caps;
2216 flush_tid = __mark_caps_flushing(inode, session, true,
2219 __prep_cap(&arg, cap, CEPH_CAP_OP_FLUSH, CEPH_CLIENT_CAPS_SYNC,
2220 __ceph_caps_used(ci), __ceph_caps_wanted(ci),
2221 (cap->issued | cap->implemented),
2222 flushing, flush_tid, oldest_flush_tid);
2223 spin_unlock(&ci->i_ceph_lock);
2225 __send_cap(mdsc, &arg, ci);
2227 if (!list_empty(&ci->i_cap_flush_list)) {
2228 struct ceph_cap_flush *cf =
2229 list_last_entry(&ci->i_cap_flush_list,
2230 struct ceph_cap_flush, i_list);
2232 flush_tid = cf->tid;
2234 flushing = ci->i_flushing_caps;
2235 spin_unlock(&ci->i_ceph_lock);
2239 mutex_unlock(&session->s_mutex);
2246 * Return true if we've flushed caps through the given flush_tid.
2248 static int caps_are_flushed(struct inode *inode, u64 flush_tid)
2250 struct ceph_inode_info *ci = ceph_inode(inode);
2253 spin_lock(&ci->i_ceph_lock);
2254 if (!list_empty(&ci->i_cap_flush_list)) {
2255 struct ceph_cap_flush * cf =
2256 list_first_entry(&ci->i_cap_flush_list,
2257 struct ceph_cap_flush, i_list);
2258 if (cf->tid <= flush_tid)
2261 spin_unlock(&ci->i_ceph_lock);
2266 * wait for any unsafe requests to complete.
2268 static int unsafe_request_wait(struct inode *inode)
2270 struct ceph_inode_info *ci = ceph_inode(inode);
2271 struct ceph_mds_request *req1 = NULL, *req2 = NULL;
2274 spin_lock(&ci->i_unsafe_lock);
2275 if (S_ISDIR(inode->i_mode) && !list_empty(&ci->i_unsafe_dirops)) {
2276 req1 = list_last_entry(&ci->i_unsafe_dirops,
2277 struct ceph_mds_request,
2279 ceph_mdsc_get_request(req1);
2281 if (!list_empty(&ci->i_unsafe_iops)) {
2282 req2 = list_last_entry(&ci->i_unsafe_iops,
2283 struct ceph_mds_request,
2284 r_unsafe_target_item);
2285 ceph_mdsc_get_request(req2);
2287 spin_unlock(&ci->i_unsafe_lock);
2289 dout("unsafe_request_wait %p wait on tid %llu %llu\n",
2290 inode, req1 ? req1->r_tid : 0ULL, req2 ? req2->r_tid : 0ULL);
2292 ret = !wait_for_completion_timeout(&req1->r_safe_completion,
2293 ceph_timeout_jiffies(req1->r_timeout));
2296 ceph_mdsc_put_request(req1);
2299 ret = !wait_for_completion_timeout(&req2->r_safe_completion,
2300 ceph_timeout_jiffies(req2->r_timeout));
2303 ceph_mdsc_put_request(req2);
2308 int ceph_fsync(struct file *file, loff_t start, loff_t end, int datasync)
2310 struct ceph_file_info *fi = file->private_data;
2311 struct inode *inode = file->f_mapping->host;
2312 struct ceph_inode_info *ci = ceph_inode(inode);
2317 dout("fsync %p%s\n", inode, datasync ? " datasync" : "");
2319 ret = file_write_and_wait_range(file, start, end);
2323 ret = ceph_wait_on_async_create(inode);
2327 dirty = try_flush_caps(inode, &flush_tid);
2328 dout("fsync dirty caps are %s\n", ceph_cap_string(dirty));
2330 err = unsafe_request_wait(inode);
2333 * only wait on non-file metadata writeback (the mds
2334 * can recover size and mtime, so we don't need to
2337 if (!err && (dirty & ~CEPH_CAP_ANY_FILE_WR)) {
2338 err = wait_event_interruptible(ci->i_cap_wq,
2339 caps_are_flushed(inode, flush_tid));
2345 if (errseq_check(&ci->i_meta_err, READ_ONCE(fi->meta_err))) {
2346 spin_lock(&file->f_lock);
2347 err = errseq_check_and_advance(&ci->i_meta_err,
2349 spin_unlock(&file->f_lock);
2354 dout("fsync %p%s result=%d\n", inode, datasync ? " datasync" : "", ret);
2359 * Flush any dirty caps back to the mds. If we aren't asked to wait,
2360 * queue inode for flush but don't do so immediately, because we can
2361 * get by with fewer MDS messages if we wait for data writeback to
2364 int ceph_write_inode(struct inode *inode, struct writeback_control *wbc)
2366 struct ceph_inode_info *ci = ceph_inode(inode);
2370 int wait = (wbc->sync_mode == WB_SYNC_ALL && !wbc->for_sync);
2372 dout("write_inode %p wait=%d\n", inode, wait);
2374 dirty = try_flush_caps(inode, &flush_tid);
2376 err = wait_event_interruptible(ci->i_cap_wq,
2377 caps_are_flushed(inode, flush_tid));
2379 struct ceph_mds_client *mdsc =
2380 ceph_sb_to_client(inode->i_sb)->mdsc;
2382 spin_lock(&ci->i_ceph_lock);
2383 if (__ceph_caps_dirty(ci))
2384 __cap_delay_requeue_front(mdsc, ci);
2385 spin_unlock(&ci->i_ceph_lock);
2390 static void __kick_flushing_caps(struct ceph_mds_client *mdsc,
2391 struct ceph_mds_session *session,
2392 struct ceph_inode_info *ci,
2393 u64 oldest_flush_tid)
2394 __releases(ci->i_ceph_lock)
2395 __acquires(ci->i_ceph_lock)
2397 struct inode *inode = &ci->vfs_inode;
2398 struct ceph_cap *cap;
2399 struct ceph_cap_flush *cf;
2402 u64 last_snap_flush = 0;
2404 ci->i_ceph_flags &= ~CEPH_I_KICK_FLUSH;
2406 list_for_each_entry_reverse(cf, &ci->i_cap_flush_list, i_list) {
2408 last_snap_flush = cf->tid;
2413 list_for_each_entry(cf, &ci->i_cap_flush_list, i_list) {
2414 if (cf->tid < first_tid)
2417 cap = ci->i_auth_cap;
2418 if (!(cap && cap->session == session)) {
2419 pr_err("%p auth cap %p not mds%d ???\n",
2420 inode, cap, session->s_mds);
2424 first_tid = cf->tid + 1;
2427 struct cap_msg_args arg;
2429 dout("kick_flushing_caps %p cap %p tid %llu %s\n",
2430 inode, cap, cf->tid, ceph_cap_string(cf->caps));
2431 __prep_cap(&arg, cap, CEPH_CAP_OP_FLUSH,
2432 (cf->tid < last_snap_flush ?
2433 CEPH_CLIENT_CAPS_PENDING_CAPSNAP : 0),
2434 __ceph_caps_used(ci),
2435 __ceph_caps_wanted(ci),
2436 (cap->issued | cap->implemented),
2437 cf->caps, cf->tid, oldest_flush_tid);
2438 spin_unlock(&ci->i_ceph_lock);
2439 __send_cap(mdsc, &arg, ci);
2441 struct ceph_cap_snap *capsnap =
2442 container_of(cf, struct ceph_cap_snap,
2444 dout("kick_flushing_caps %p capsnap %p tid %llu %s\n",
2445 inode, capsnap, cf->tid,
2446 ceph_cap_string(capsnap->dirty));
2448 refcount_inc(&capsnap->nref);
2449 spin_unlock(&ci->i_ceph_lock);
2451 ret = __send_flush_snap(inode, session, capsnap, cap->mseq,
2454 pr_err("kick_flushing_caps: error sending "
2455 "cap flushsnap, ino (%llx.%llx) "
2456 "tid %llu follows %llu\n",
2457 ceph_vinop(inode), cf->tid,
2461 ceph_put_cap_snap(capsnap);
2464 spin_lock(&ci->i_ceph_lock);
2468 void ceph_early_kick_flushing_caps(struct ceph_mds_client *mdsc,
2469 struct ceph_mds_session *session)
2471 struct ceph_inode_info *ci;
2472 struct ceph_cap *cap;
2473 u64 oldest_flush_tid;
2475 dout("early_kick_flushing_caps mds%d\n", session->s_mds);
2477 spin_lock(&mdsc->cap_dirty_lock);
2478 oldest_flush_tid = __get_oldest_flush_tid(mdsc);
2479 spin_unlock(&mdsc->cap_dirty_lock);
2481 list_for_each_entry(ci, &session->s_cap_flushing, i_flushing_item) {
2482 spin_lock(&ci->i_ceph_lock);
2483 cap = ci->i_auth_cap;
2484 if (!(cap && cap->session == session)) {
2485 pr_err("%p auth cap %p not mds%d ???\n",
2486 &ci->vfs_inode, cap, session->s_mds);
2487 spin_unlock(&ci->i_ceph_lock);
2493 * if flushing caps were revoked, we re-send the cap flush
2494 * in client reconnect stage. This guarantees MDS * processes
2495 * the cap flush message before issuing the flushing caps to
2498 if ((cap->issued & ci->i_flushing_caps) !=
2499 ci->i_flushing_caps) {
2500 /* encode_caps_cb() also will reset these sequence
2501 * numbers. make sure sequence numbers in cap flush
2502 * message match later reconnect message */
2506 __kick_flushing_caps(mdsc, session, ci,
2509 ci->i_ceph_flags |= CEPH_I_KICK_FLUSH;
2512 spin_unlock(&ci->i_ceph_lock);
2516 void ceph_kick_flushing_caps(struct ceph_mds_client *mdsc,
2517 struct ceph_mds_session *session)
2519 struct ceph_inode_info *ci;
2520 struct ceph_cap *cap;
2521 u64 oldest_flush_tid;
2523 lockdep_assert_held(&session->s_mutex);
2525 dout("kick_flushing_caps mds%d\n", session->s_mds);
2527 spin_lock(&mdsc->cap_dirty_lock);
2528 oldest_flush_tid = __get_oldest_flush_tid(mdsc);
2529 spin_unlock(&mdsc->cap_dirty_lock);
2531 list_for_each_entry(ci, &session->s_cap_flushing, i_flushing_item) {
2532 spin_lock(&ci->i_ceph_lock);
2533 cap = ci->i_auth_cap;
2534 if (!(cap && cap->session == session)) {
2535 pr_err("%p auth cap %p not mds%d ???\n",
2536 &ci->vfs_inode, cap, session->s_mds);
2537 spin_unlock(&ci->i_ceph_lock);
2540 if (ci->i_ceph_flags & CEPH_I_KICK_FLUSH) {
2541 __kick_flushing_caps(mdsc, session, ci,
2544 spin_unlock(&ci->i_ceph_lock);
2548 void ceph_kick_flushing_inode_caps(struct ceph_mds_session *session,
2549 struct ceph_inode_info *ci)
2551 struct ceph_mds_client *mdsc = session->s_mdsc;
2552 struct ceph_cap *cap = ci->i_auth_cap;
2554 lockdep_assert_held(&ci->i_ceph_lock);
2556 dout("%s %p flushing %s\n", __func__, &ci->vfs_inode,
2557 ceph_cap_string(ci->i_flushing_caps));
2559 if (!list_empty(&ci->i_cap_flush_list)) {
2560 u64 oldest_flush_tid;
2561 spin_lock(&mdsc->cap_dirty_lock);
2562 list_move_tail(&ci->i_flushing_item,
2563 &cap->session->s_cap_flushing);
2564 oldest_flush_tid = __get_oldest_flush_tid(mdsc);
2565 spin_unlock(&mdsc->cap_dirty_lock);
2567 __kick_flushing_caps(mdsc, session, ci, oldest_flush_tid);
2573 * Take references to capabilities we hold, so that we don't release
2574 * them to the MDS prematurely.
2576 void ceph_take_cap_refs(struct ceph_inode_info *ci, int got,
2577 bool snap_rwsem_locked)
2579 lockdep_assert_held(&ci->i_ceph_lock);
2581 if (got & CEPH_CAP_PIN)
2583 if (got & CEPH_CAP_FILE_RD)
2585 if (got & CEPH_CAP_FILE_CACHE)
2586 ci->i_rdcache_ref++;
2587 if (got & CEPH_CAP_FILE_EXCL)
2589 if (got & CEPH_CAP_FILE_WR) {
2590 if (ci->i_wr_ref == 0 && !ci->i_head_snapc) {
2591 BUG_ON(!snap_rwsem_locked);
2592 ci->i_head_snapc = ceph_get_snap_context(
2593 ci->i_snap_realm->cached_context);
2597 if (got & CEPH_CAP_FILE_BUFFER) {
2598 if (ci->i_wb_ref == 0)
2599 ihold(&ci->vfs_inode);
2601 dout("%s %p wb %d -> %d (?)\n", __func__,
2602 &ci->vfs_inode, ci->i_wb_ref-1, ci->i_wb_ref);
2607 * Try to grab cap references. Specify those refs we @want, and the
2608 * minimal set we @need. Also include the larger offset we are writing
2609 * to (when applicable), and check against max_size here as well.
2610 * Note that caller is responsible for ensuring max_size increases are
2611 * requested from the MDS.
2613 * Returns 0 if caps were not able to be acquired (yet), 1 if succeed,
2614 * or a negative error code. There are 3 speical error codes:
2615 * -EAGAIN: need to sleep but non-blocking is specified
2616 * -EFBIG: ask caller to call check_max_size() and try again.
2617 * -ESTALE: ask caller to call ceph_renew_caps() and try again.
2620 /* first 8 bits are reserved for CEPH_FILE_MODE_FOO */
2621 NON_BLOCKING = (1 << 8),
2622 CHECK_FILELOCK = (1 << 9),
2625 static int try_get_cap_refs(struct inode *inode, int need, int want,
2626 loff_t endoff, int flags, int *got)
2628 struct ceph_inode_info *ci = ceph_inode(inode);
2629 struct ceph_mds_client *mdsc = ceph_inode_to_client(inode)->mdsc;
2631 int have, implemented;
2632 bool snap_rwsem_locked = false;
2634 dout("get_cap_refs %p need %s want %s\n", inode,
2635 ceph_cap_string(need), ceph_cap_string(want));
2638 spin_lock(&ci->i_ceph_lock);
2640 if ((flags & CHECK_FILELOCK) &&
2641 (ci->i_ceph_flags & CEPH_I_ERROR_FILELOCK)) {
2642 dout("try_get_cap_refs %p error filelock\n", inode);
2647 /* finish pending truncate */
2648 while (ci->i_truncate_pending) {
2649 spin_unlock(&ci->i_ceph_lock);
2650 if (snap_rwsem_locked) {
2651 up_read(&mdsc->snap_rwsem);
2652 snap_rwsem_locked = false;
2654 __ceph_do_pending_vmtruncate(inode);
2655 spin_lock(&ci->i_ceph_lock);
2658 have = __ceph_caps_issued(ci, &implemented);
2660 if (have & need & CEPH_CAP_FILE_WR) {
2661 if (endoff >= 0 && endoff > (loff_t)ci->i_max_size) {
2662 dout("get_cap_refs %p endoff %llu > maxsize %llu\n",
2663 inode, endoff, ci->i_max_size);
2664 if (endoff > ci->i_requested_max_size)
2665 ret = ci->i_auth_cap ? -EFBIG : -ESTALE;
2669 * If a sync write is in progress, we must wait, so that we
2670 * can get a final snapshot value for size+mtime.
2672 if (__ceph_have_pending_cap_snap(ci)) {
2673 dout("get_cap_refs %p cap_snap_pending\n", inode);
2678 if ((have & need) == need) {
2680 * Look at (implemented & ~have & not) so that we keep waiting
2681 * on transition from wanted -> needed caps. This is needed
2682 * for WRBUFFER|WR -> WR to avoid a new WR sync write from
2683 * going before a prior buffered writeback happens.
2685 int not = want & ~(have & need);
2686 int revoking = implemented & ~have;
2687 dout("get_cap_refs %p have %s but not %s (revoking %s)\n",
2688 inode, ceph_cap_string(have), ceph_cap_string(not),
2689 ceph_cap_string(revoking));
2690 if ((revoking & not) == 0) {
2691 if (!snap_rwsem_locked &&
2692 !ci->i_head_snapc &&
2693 (need & CEPH_CAP_FILE_WR)) {
2694 if (!down_read_trylock(&mdsc->snap_rwsem)) {
2696 * we can not call down_read() when
2697 * task isn't in TASK_RUNNING state
2699 if (flags & NON_BLOCKING) {
2704 spin_unlock(&ci->i_ceph_lock);
2705 down_read(&mdsc->snap_rwsem);
2706 snap_rwsem_locked = true;
2709 snap_rwsem_locked = true;
2711 if ((have & want) == want)
2715 if (S_ISREG(inode->i_mode) &&
2716 (need & CEPH_CAP_FILE_RD) &&
2717 !(*got & CEPH_CAP_FILE_CACHE))
2718 ceph_disable_fscache_readpage(ci);
2719 ceph_take_cap_refs(ci, *got, true);
2723 int session_readonly = false;
2725 if (ci->i_auth_cap &&
2726 (need & (CEPH_CAP_FILE_WR | CEPH_CAP_FILE_EXCL))) {
2727 struct ceph_mds_session *s = ci->i_auth_cap->session;
2728 spin_lock(&s->s_cap_lock);
2729 session_readonly = s->s_readonly;
2730 spin_unlock(&s->s_cap_lock);
2732 if (session_readonly) {
2733 dout("get_cap_refs %p need %s but mds%d readonly\n",
2734 inode, ceph_cap_string(need), ci->i_auth_cap->mds);
2739 if (READ_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_SHUTDOWN) {
2740 dout("get_cap_refs %p forced umount\n", inode);
2744 mds_wanted = __ceph_caps_mds_wanted(ci, false);
2745 if (need & ~mds_wanted) {
2746 dout("get_cap_refs %p need %s > mds_wanted %s\n",
2747 inode, ceph_cap_string(need),
2748 ceph_cap_string(mds_wanted));
2753 dout("get_cap_refs %p have %s need %s\n", inode,
2754 ceph_cap_string(have), ceph_cap_string(need));
2758 __ceph_touch_fmode(ci, mdsc, flags);
2760 spin_unlock(&ci->i_ceph_lock);
2761 if (snap_rwsem_locked)
2762 up_read(&mdsc->snap_rwsem);
2765 ceph_update_cap_mis(&mdsc->metric);
2767 ceph_update_cap_hit(&mdsc->metric);
2769 dout("get_cap_refs %p ret %d got %s\n", inode,
2770 ret, ceph_cap_string(*got));
2775 * Check the offset we are writing up to against our current
2776 * max_size. If necessary, tell the MDS we want to write to
2779 static void check_max_size(struct inode *inode, loff_t endoff)
2781 struct ceph_inode_info *ci = ceph_inode(inode);
2784 /* do we need to explicitly request a larger max_size? */
2785 spin_lock(&ci->i_ceph_lock);
2786 if (endoff >= ci->i_max_size && endoff > ci->i_wanted_max_size) {
2787 dout("write %p at large endoff %llu, req max_size\n",
2789 ci->i_wanted_max_size = endoff;
2791 /* duplicate ceph_check_caps()'s logic */
2792 if (ci->i_auth_cap &&
2793 (ci->i_auth_cap->issued & CEPH_CAP_FILE_WR) &&
2794 ci->i_wanted_max_size > ci->i_max_size &&
2795 ci->i_wanted_max_size > ci->i_requested_max_size)
2797 spin_unlock(&ci->i_ceph_lock);
2799 ceph_check_caps(ci, CHECK_CAPS_AUTHONLY, NULL);
2802 static inline int get_used_fmode(int caps)
2805 if (caps & CEPH_CAP_FILE_RD)
2806 fmode |= CEPH_FILE_MODE_RD;
2807 if (caps & CEPH_CAP_FILE_WR)
2808 fmode |= CEPH_FILE_MODE_WR;
2812 int ceph_try_get_caps(struct inode *inode, int need, int want,
2813 bool nonblock, int *got)
2817 BUG_ON(need & ~CEPH_CAP_FILE_RD);
2818 BUG_ON(want & ~(CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO |
2819 CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_EXCL |
2820 CEPH_CAP_ANY_DIR_OPS));
2822 ret = ceph_pool_perm_check(inode, need);
2827 flags = get_used_fmode(need | want);
2829 flags |= NON_BLOCKING;
2831 ret = try_get_cap_refs(inode, need, want, 0, flags, got);
2832 /* three special error codes */
2833 if (ret == -EAGAIN || ret == -EFBIG || ret == -ESTALE)
2839 * Wait for caps, and take cap references. If we can't get a WR cap
2840 * due to a small max_size, make sure we check_max_size (and possibly
2841 * ask the mds) so we don't get hung up indefinitely.
2843 int ceph_get_caps(struct file *filp, int need, int want,
2844 loff_t endoff, int *got, struct page **pinned_page)
2846 struct ceph_file_info *fi = filp->private_data;
2847 struct inode *inode = file_inode(filp);
2848 struct ceph_inode_info *ci = ceph_inode(inode);
2849 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
2850 int ret, _got, flags;
2852 ret = ceph_pool_perm_check(inode, need);
2856 if ((fi->fmode & CEPH_FILE_MODE_WR) &&
2857 fi->filp_gen != READ_ONCE(fsc->filp_gen))
2860 flags = get_used_fmode(need | want);
2863 flags &= CEPH_FILE_MODE_MASK;
2864 if (atomic_read(&fi->num_locks))
2865 flags |= CHECK_FILELOCK;
2867 ret = try_get_cap_refs(inode, need, want, endoff,
2869 WARN_ON_ONCE(ret == -EAGAIN);
2871 struct ceph_mds_client *mdsc = fsc->mdsc;
2873 DEFINE_WAIT_FUNC(wait, woken_wake_function);
2875 cw.ino = inode->i_ino;
2876 cw.tgid = current->tgid;
2880 spin_lock(&mdsc->caps_list_lock);
2881 list_add(&cw.list, &mdsc->cap_wait_list);
2882 spin_unlock(&mdsc->caps_list_lock);
2884 /* make sure used fmode not timeout */
2885 ceph_get_fmode(ci, flags, FMODE_WAIT_BIAS);
2886 add_wait_queue(&ci->i_cap_wq, &wait);
2888 flags |= NON_BLOCKING;
2889 while (!(ret = try_get_cap_refs(inode, need, want,
2890 endoff, flags, &_got))) {
2891 if (signal_pending(current)) {
2895 wait_woken(&wait, TASK_INTERRUPTIBLE, MAX_SCHEDULE_TIMEOUT);
2898 remove_wait_queue(&ci->i_cap_wq, &wait);
2899 ceph_put_fmode(ci, flags, FMODE_WAIT_BIAS);
2901 spin_lock(&mdsc->caps_list_lock);
2903 spin_unlock(&mdsc->caps_list_lock);
2909 if ((fi->fmode & CEPH_FILE_MODE_WR) &&
2910 fi->filp_gen != READ_ONCE(fsc->filp_gen)) {
2911 if (ret >= 0 && _got)
2912 ceph_put_cap_refs(ci, _got);
2917 if (ret == -EFBIG || ret == -ESTALE) {
2918 int ret2 = ceph_wait_on_async_create(inode);
2922 if (ret == -EFBIG) {
2923 check_max_size(inode, endoff);
2926 if (ret == -ESTALE) {
2927 /* session was killed, try renew caps */
2928 ret = ceph_renew_caps(inode, flags);
2935 if (S_ISREG(ci->vfs_inode.i_mode) &&
2936 ci->i_inline_version != CEPH_INLINE_NONE &&
2937 (_got & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) &&
2938 i_size_read(inode) > 0) {
2940 find_get_page(inode->i_mapping, 0);
2942 if (PageUptodate(page)) {
2943 *pinned_page = page;
2949 * drop cap refs first because getattr while
2950 * holding * caps refs can cause deadlock.
2952 ceph_put_cap_refs(ci, _got);
2956 * getattr request will bring inline data into
2959 ret = __ceph_do_getattr(inode, NULL,
2960 CEPH_STAT_CAP_INLINE_DATA,
2969 if (S_ISREG(ci->vfs_inode.i_mode) &&
2970 (_got & CEPH_CAP_FILE_RD) && (_got & CEPH_CAP_FILE_CACHE))
2971 ceph_fscache_revalidate_cookie(ci);
2978 * Take cap refs. Caller must already know we hold at least one ref
2979 * on the caps in question or we don't know this is safe.
2981 void ceph_get_cap_refs(struct ceph_inode_info *ci, int caps)
2983 spin_lock(&ci->i_ceph_lock);
2984 ceph_take_cap_refs(ci, caps, false);
2985 spin_unlock(&ci->i_ceph_lock);
2990 * drop cap_snap that is not associated with any snapshot.
2991 * we don't need to send FLUSHSNAP message for it.
2993 static int ceph_try_drop_cap_snap(struct ceph_inode_info *ci,
2994 struct ceph_cap_snap *capsnap)
2996 if (!capsnap->need_flush &&
2997 !capsnap->writing && !capsnap->dirty_pages) {
2998 dout("dropping cap_snap %p follows %llu\n",
2999 capsnap, capsnap->follows);
3000 BUG_ON(capsnap->cap_flush.tid > 0);
3001 ceph_put_snap_context(capsnap->context);
3002 if (!list_is_last(&capsnap->ci_item, &ci->i_cap_snaps))
3003 ci->i_ceph_flags |= CEPH_I_FLUSH_SNAPS;
3005 list_del(&capsnap->ci_item);
3006 ceph_put_cap_snap(capsnap);
3015 * If we released the last ref on any given cap, call ceph_check_caps
3016 * to release (or schedule a release).
3018 * If we are releasing a WR cap (from a sync write), finalize any affected
3019 * cap_snap, and wake up any waiters.
3021 static void __ceph_put_cap_refs(struct ceph_inode_info *ci, int had,
3022 bool skip_checking_caps)
3024 struct inode *inode = &ci->vfs_inode;
3025 int last = 0, put = 0, flushsnaps = 0, wake = 0;
3027 spin_lock(&ci->i_ceph_lock);
3028 if (had & CEPH_CAP_PIN)
3030 if (had & CEPH_CAP_FILE_RD)
3031 if (--ci->i_rd_ref == 0)
3033 if (had & CEPH_CAP_FILE_CACHE)
3034 if (--ci->i_rdcache_ref == 0)
3036 if (had & CEPH_CAP_FILE_EXCL)
3037 if (--ci->i_fx_ref == 0)
3039 if (had & CEPH_CAP_FILE_BUFFER) {
3040 if (--ci->i_wb_ref == 0) {
3044 dout("put_cap_refs %p wb %d -> %d (?)\n",
3045 inode, ci->i_wb_ref+1, ci->i_wb_ref);
3047 if (had & CEPH_CAP_FILE_WR)
3048 if (--ci->i_wr_ref == 0) {
3050 if (__ceph_have_pending_cap_snap(ci)) {
3051 struct ceph_cap_snap *capsnap =
3052 list_last_entry(&ci->i_cap_snaps,
3053 struct ceph_cap_snap,
3055 capsnap->writing = 0;
3056 if (ceph_try_drop_cap_snap(ci, capsnap))
3058 else if (__ceph_finish_cap_snap(ci, capsnap))
3062 if (ci->i_wrbuffer_ref_head == 0 &&
3063 ci->i_dirty_caps == 0 &&
3064 ci->i_flushing_caps == 0) {
3065 BUG_ON(!ci->i_head_snapc);
3066 ceph_put_snap_context(ci->i_head_snapc);
3067 ci->i_head_snapc = NULL;
3069 /* see comment in __ceph_remove_cap() */
3070 if (!__ceph_is_any_real_caps(ci) && ci->i_snap_realm)
3071 drop_inode_snap_realm(ci);
3073 spin_unlock(&ci->i_ceph_lock);
3075 dout("put_cap_refs %p had %s%s%s\n", inode, ceph_cap_string(had),
3076 last ? " last" : "", put ? " put" : "");
3078 if (last && !skip_checking_caps)
3079 ceph_check_caps(ci, 0, NULL);
3080 else if (flushsnaps)
3081 ceph_flush_snaps(ci, NULL);
3083 wake_up_all(&ci->i_cap_wq);
3088 void ceph_put_cap_refs(struct ceph_inode_info *ci, int had)
3090 __ceph_put_cap_refs(ci, had, false);
3093 void ceph_put_cap_refs_no_check_caps(struct ceph_inode_info *ci, int had)
3095 __ceph_put_cap_refs(ci, had, true);
3099 * Release @nr WRBUFFER refs on dirty pages for the given @snapc snap
3100 * context. Adjust per-snap dirty page accounting as appropriate.
3101 * Once all dirty data for a cap_snap is flushed, flush snapped file
3102 * metadata back to the MDS. If we dropped the last ref, call
3105 void ceph_put_wrbuffer_cap_refs(struct ceph_inode_info *ci, int nr,
3106 struct ceph_snap_context *snapc)
3108 struct inode *inode = &ci->vfs_inode;
3109 struct ceph_cap_snap *capsnap = NULL;
3113 bool flush_snaps = false;
3114 bool complete_capsnap = false;
3116 spin_lock(&ci->i_ceph_lock);
3117 ci->i_wrbuffer_ref -= nr;
3118 if (ci->i_wrbuffer_ref == 0) {
3123 if (ci->i_head_snapc == snapc) {
3124 ci->i_wrbuffer_ref_head -= nr;
3125 if (ci->i_wrbuffer_ref_head == 0 &&
3126 ci->i_wr_ref == 0 &&
3127 ci->i_dirty_caps == 0 &&
3128 ci->i_flushing_caps == 0) {
3129 BUG_ON(!ci->i_head_snapc);
3130 ceph_put_snap_context(ci->i_head_snapc);
3131 ci->i_head_snapc = NULL;
3133 dout("put_wrbuffer_cap_refs on %p head %d/%d -> %d/%d %s\n",
3135 ci->i_wrbuffer_ref+nr, ci->i_wrbuffer_ref_head+nr,
3136 ci->i_wrbuffer_ref, ci->i_wrbuffer_ref_head,
3137 last ? " LAST" : "");
3139 list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) {
3140 if (capsnap->context == snapc) {
3146 capsnap->dirty_pages -= nr;
3147 if (capsnap->dirty_pages == 0) {
3148 complete_capsnap = true;
3149 if (!capsnap->writing) {
3150 if (ceph_try_drop_cap_snap(ci, capsnap)) {
3153 ci->i_ceph_flags |= CEPH_I_FLUSH_SNAPS;
3158 dout("put_wrbuffer_cap_refs on %p cap_snap %p "
3159 " snap %lld %d/%d -> %d/%d %s%s\n",
3160 inode, capsnap, capsnap->context->seq,
3161 ci->i_wrbuffer_ref+nr, capsnap->dirty_pages + nr,
3162 ci->i_wrbuffer_ref, capsnap->dirty_pages,
3163 last ? " (wrbuffer last)" : "",
3164 complete_capsnap ? " (complete capsnap)" : "");
3167 spin_unlock(&ci->i_ceph_lock);
3170 ceph_check_caps(ci, 0, NULL);
3171 } else if (flush_snaps) {
3172 ceph_flush_snaps(ci, NULL);
3174 if (complete_capsnap)
3175 wake_up_all(&ci->i_cap_wq);
3177 /* avoid calling iput_final() in osd dispatch threads */
3178 ceph_async_iput(inode);
3183 * Invalidate unlinked inode's aliases, so we can drop the inode ASAP.
3185 static void invalidate_aliases(struct inode *inode)
3187 struct dentry *dn, *prev = NULL;
3189 dout("invalidate_aliases inode %p\n", inode);
3190 d_prune_aliases(inode);
3192 * For non-directory inode, d_find_alias() only returns
3193 * hashed dentry. After calling d_invalidate(), the
3194 * dentry becomes unhashed.
3196 * For directory inode, d_find_alias() can return
3197 * unhashed dentry. But directory inode should have
3198 * one alias at most.
3200 while ((dn = d_find_alias(inode))) {
3214 struct cap_extra_info {
3215 struct ceph_string *pool_ns;
3225 /* currently issued */
3227 struct timespec64 btime;
3231 * Handle a cap GRANT message from the MDS. (Note that a GRANT may
3232 * actually be a revocation if it specifies a smaller cap set.)
3234 * caller holds s_mutex and i_ceph_lock, we drop both.
3236 static void handle_cap_grant(struct inode *inode,
3237 struct ceph_mds_session *session,
3238 struct ceph_cap *cap,
3239 struct ceph_mds_caps *grant,
3240 struct ceph_buffer *xattr_buf,
3241 struct cap_extra_info *extra_info)
3242 __releases(ci->i_ceph_lock)
3243 __releases(session->s_mdsc->snap_rwsem)
3245 struct ceph_inode_info *ci = ceph_inode(inode);
3246 int seq = le32_to_cpu(grant->seq);
3247 int newcaps = le32_to_cpu(grant->caps);
3248 int used, wanted, dirty;
3249 u64 size = le64_to_cpu(grant->size);
3250 u64 max_size = le64_to_cpu(grant->max_size);
3251 unsigned char check_caps = 0;
3252 bool was_stale = cap->cap_gen < session->s_cap_gen;
3254 bool writeback = false;
3255 bool queue_trunc = false;
3256 bool queue_invalidate = false;
3257 bool deleted_inode = false;
3258 bool fill_inline = false;
3260 dout("handle_cap_grant inode %p cap %p mds%d seq %d %s\n",
3261 inode, cap, session->s_mds, seq, ceph_cap_string(newcaps));
3262 dout(" size %llu max_size %llu, i_size %llu\n", size, max_size,
3267 * If CACHE is being revoked, and we have no dirty buffers,
3268 * try to invalidate (once). (If there are dirty buffers, we
3269 * will invalidate _after_ writeback.)
3271 if (S_ISREG(inode->i_mode) && /* don't invalidate readdir cache */
3272 ((cap->issued & ~newcaps) & CEPH_CAP_FILE_CACHE) &&
3273 (newcaps & CEPH_CAP_FILE_LAZYIO) == 0 &&
3274 !(ci->i_wrbuffer_ref || ci->i_wb_ref)) {
3275 if (try_nonblocking_invalidate(inode)) {
3276 /* there were locked pages.. invalidate later
3277 in a separate thread. */
3278 if (ci->i_rdcache_revoking != ci->i_rdcache_gen) {
3279 queue_invalidate = true;
3280 ci->i_rdcache_revoking = ci->i_rdcache_gen;
3286 cap->issued = cap->implemented = CEPH_CAP_PIN;
3289 * auth mds of the inode changed. we received the cap export message,
3290 * but still haven't received the cap import message. handle_cap_export
3291 * updated the new auth MDS' cap.
3293 * "ceph_seq_cmp(seq, cap->seq) <= 0" means we are processing a message
3294 * that was sent before the cap import message. So don't remove caps.
3296 if (ceph_seq_cmp(seq, cap->seq) <= 0) {
3297 WARN_ON(cap != ci->i_auth_cap);
3298 WARN_ON(cap->cap_id != le64_to_cpu(grant->cap_id));
3300 newcaps |= cap->issued;
3303 /* side effects now are allowed */
3304 cap->cap_gen = session->s_cap_gen;
3307 __check_cap_issue(ci, cap, newcaps);
3309 inode_set_max_iversion_raw(inode, extra_info->change_attr);
3311 if ((newcaps & CEPH_CAP_AUTH_SHARED) &&
3312 (extra_info->issued & CEPH_CAP_AUTH_EXCL) == 0) {
3313 inode->i_mode = le32_to_cpu(grant->mode);
3314 inode->i_uid = make_kuid(&init_user_ns, le32_to_cpu(grant->uid));
3315 inode->i_gid = make_kgid(&init_user_ns, le32_to_cpu(grant->gid));
3316 ci->i_btime = extra_info->btime;
3317 dout("%p mode 0%o uid.gid %d.%d\n", inode, inode->i_mode,
3318 from_kuid(&init_user_ns, inode->i_uid),
3319 from_kgid(&init_user_ns, inode->i_gid));
3322 if ((newcaps & CEPH_CAP_LINK_SHARED) &&
3323 (extra_info->issued & CEPH_CAP_LINK_EXCL) == 0) {
3324 set_nlink(inode, le32_to_cpu(grant->nlink));
3325 if (inode->i_nlink == 0 &&
3326 (newcaps & (CEPH_CAP_LINK_SHARED | CEPH_CAP_LINK_EXCL)))
3327 deleted_inode = true;
3330 if ((extra_info->issued & CEPH_CAP_XATTR_EXCL) == 0 &&
3332 int len = le32_to_cpu(grant->xattr_len);
3333 u64 version = le64_to_cpu(grant->xattr_version);
3335 if (version > ci->i_xattrs.version) {
3336 dout(" got new xattrs v%llu on %p len %d\n",
3337 version, inode, len);
3338 if (ci->i_xattrs.blob)
3339 ceph_buffer_put(ci->i_xattrs.blob);
3340 ci->i_xattrs.blob = ceph_buffer_get(xattr_buf);
3341 ci->i_xattrs.version = version;
3342 ceph_forget_all_cached_acls(inode);
3343 ceph_security_invalidate_secctx(inode);
3347 if (newcaps & CEPH_CAP_ANY_RD) {
3348 struct timespec64 mtime, atime, ctime;
3349 /* ctime/mtime/atime? */
3350 ceph_decode_timespec64(&mtime, &grant->mtime);
3351 ceph_decode_timespec64(&atime, &grant->atime);
3352 ceph_decode_timespec64(&ctime, &grant->ctime);
3353 ceph_fill_file_time(inode, extra_info->issued,
3354 le32_to_cpu(grant->time_warp_seq),
3355 &ctime, &mtime, &atime);
3358 if ((newcaps & CEPH_CAP_FILE_SHARED) && extra_info->dirstat_valid) {
3359 ci->i_files = extra_info->nfiles;
3360 ci->i_subdirs = extra_info->nsubdirs;
3363 if (newcaps & (CEPH_CAP_ANY_FILE_RD | CEPH_CAP_ANY_FILE_WR)) {
3364 /* file layout may have changed */
3365 s64 old_pool = ci->i_layout.pool_id;
3366 struct ceph_string *old_ns;
3368 ceph_file_layout_from_legacy(&ci->i_layout, &grant->layout);
3369 old_ns = rcu_dereference_protected(ci->i_layout.pool_ns,
3370 lockdep_is_held(&ci->i_ceph_lock));
3371 rcu_assign_pointer(ci->i_layout.pool_ns, extra_info->pool_ns);
3373 if (ci->i_layout.pool_id != old_pool ||
3374 extra_info->pool_ns != old_ns)
3375 ci->i_ceph_flags &= ~CEPH_I_POOL_PERM;
3377 extra_info->pool_ns = old_ns;
3379 /* size/truncate_seq? */
3380 queue_trunc = ceph_fill_file_size(inode, extra_info->issued,
3381 le32_to_cpu(grant->truncate_seq),
3382 le64_to_cpu(grant->truncate_size),
3386 if (ci->i_auth_cap == cap && (newcaps & CEPH_CAP_ANY_FILE_WR)) {
3387 if (max_size != ci->i_max_size) {
3388 dout("max_size %lld -> %llu\n",
3389 ci->i_max_size, max_size);
3390 ci->i_max_size = max_size;
3391 if (max_size >= ci->i_wanted_max_size) {
3392 ci->i_wanted_max_size = 0; /* reset */
3393 ci->i_requested_max_size = 0;
3399 /* check cap bits */
3400 wanted = __ceph_caps_wanted(ci);
3401 used = __ceph_caps_used(ci);
3402 dirty = __ceph_caps_dirty(ci);
3403 dout(" my wanted = %s, used = %s, dirty %s\n",
3404 ceph_cap_string(wanted),
3405 ceph_cap_string(used),
3406 ceph_cap_string(dirty));
3408 if ((was_stale || le32_to_cpu(grant->op) == CEPH_CAP_OP_IMPORT) &&
3409 (wanted & ~(cap->mds_wanted | newcaps))) {
3411 * If mds is importing cap, prior cap messages that update
3412 * 'wanted' may get dropped by mds (migrate seq mismatch).
3414 * We don't send cap message to update 'wanted' if what we
3415 * want are already issued. If mds revokes caps, cap message
3416 * that releases caps also tells mds what we want. But if
3417 * caps got revoked by mds forcedly (session stale). We may
3418 * haven't told mds what we want.
3423 /* revocation, grant, or no-op? */
3424 if (cap->issued & ~newcaps) {
3425 int revoking = cap->issued & ~newcaps;
3427 dout("revocation: %s -> %s (revoking %s)\n",
3428 ceph_cap_string(cap->issued),
3429 ceph_cap_string(newcaps),
3430 ceph_cap_string(revoking));
3431 if (S_ISREG(inode->i_mode) &&
3432 (revoking & used & CEPH_CAP_FILE_BUFFER))
3433 writeback = true; /* initiate writeback; will delay ack */
3434 else if (queue_invalidate &&
3435 revoking == CEPH_CAP_FILE_CACHE &&
3436 (newcaps & CEPH_CAP_FILE_LAZYIO) == 0)
3437 ; /* do nothing yet, invalidation will be queued */
3438 else if (cap == ci->i_auth_cap)
3439 check_caps = 1; /* check auth cap only */
3441 check_caps = 2; /* check all caps */
3442 cap->issued = newcaps;
3443 cap->implemented |= newcaps;
3444 } else if (cap->issued == newcaps) {
3445 dout("caps unchanged: %s -> %s\n",
3446 ceph_cap_string(cap->issued), ceph_cap_string(newcaps));
3448 dout("grant: %s -> %s\n", ceph_cap_string(cap->issued),
3449 ceph_cap_string(newcaps));
3450 /* non-auth MDS is revoking the newly grant caps ? */
3451 if (cap == ci->i_auth_cap &&
3452 __ceph_caps_revoking_other(ci, cap, newcaps))
3455 cap->issued = newcaps;
3456 cap->implemented |= newcaps; /* add bits only, to
3457 * avoid stepping on a
3458 * pending revocation */
3461 BUG_ON(cap->issued & ~cap->implemented);
3463 if (extra_info->inline_version > 0 &&
3464 extra_info->inline_version >= ci->i_inline_version) {
3465 ci->i_inline_version = extra_info->inline_version;
3466 if (ci->i_inline_version != CEPH_INLINE_NONE &&
3467 (newcaps & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)))
3471 if (ci->i_auth_cap == cap &&
3472 le32_to_cpu(grant->op) == CEPH_CAP_OP_IMPORT) {
3473 if (newcaps & ~extra_info->issued)
3476 if (ci->i_requested_max_size > max_size ||
3477 !(le32_to_cpu(grant->wanted) & CEPH_CAP_ANY_FILE_WR)) {
3478 /* re-request max_size if necessary */
3479 ci->i_requested_max_size = 0;
3483 ceph_kick_flushing_inode_caps(session, ci);
3484 spin_unlock(&ci->i_ceph_lock);
3485 up_read(&session->s_mdsc->snap_rwsem);
3487 spin_unlock(&ci->i_ceph_lock);
3491 ceph_fill_inline_data(inode, NULL, extra_info->inline_data,
3492 extra_info->inline_len);
3495 ceph_queue_vmtruncate(inode);
3499 * queue inode for writeback: we can't actually call
3500 * filemap_write_and_wait, etc. from message handler
3503 ceph_queue_writeback(inode);
3504 if (queue_invalidate)
3505 ceph_queue_invalidate(inode);
3507 invalidate_aliases(inode);
3509 wake_up_all(&ci->i_cap_wq);
3511 if (check_caps == 1)
3512 ceph_check_caps(ci, CHECK_CAPS_AUTHONLY | CHECK_CAPS_NOINVAL,
3514 else if (check_caps == 2)
3515 ceph_check_caps(ci, CHECK_CAPS_NOINVAL, session);
3517 mutex_unlock(&session->s_mutex);
3521 * Handle FLUSH_ACK from MDS, indicating that metadata we sent to the
3522 * MDS has been safely committed.
3524 static void handle_cap_flush_ack(struct inode *inode, u64 flush_tid,
3525 struct ceph_mds_caps *m,
3526 struct ceph_mds_session *session,
3527 struct ceph_cap *cap)
3528 __releases(ci->i_ceph_lock)
3530 struct ceph_inode_info *ci = ceph_inode(inode);
3531 struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
3532 struct ceph_cap_flush *cf, *tmp_cf;
3533 LIST_HEAD(to_remove);
3534 unsigned seq = le32_to_cpu(m->seq);
3535 int dirty = le32_to_cpu(m->dirty);
3538 bool wake_ci = false;
3539 bool wake_mdsc = false;
3541 list_for_each_entry_safe(cf, tmp_cf, &ci->i_cap_flush_list, i_list) {
3542 /* Is this the one that was flushed? */
3543 if (cf->tid == flush_tid)
3546 /* Is this a capsnap? */
3550 if (cf->tid <= flush_tid) {
3552 * An earlier or current tid. The FLUSH_ACK should
3553 * represent a superset of this flush's caps.
3555 wake_ci |= __detach_cap_flush_from_ci(ci, cf);
3556 list_add_tail(&cf->i_list, &to_remove);
3559 * This is a later one. Any caps in it are still dirty
3560 * so don't count them as cleaned.
3562 cleaned &= ~cf->caps;
3568 dout("handle_cap_flush_ack inode %p mds%d seq %d on %s cleaned %s,"
3569 " flushing %s -> %s\n",
3570 inode, session->s_mds, seq, ceph_cap_string(dirty),
3571 ceph_cap_string(cleaned), ceph_cap_string(ci->i_flushing_caps),
3572 ceph_cap_string(ci->i_flushing_caps & ~cleaned));
3574 if (list_empty(&to_remove) && !cleaned)
3577 ci->i_flushing_caps &= ~cleaned;
3579 spin_lock(&mdsc->cap_dirty_lock);
3581 list_for_each_entry(cf, &to_remove, i_list)
3582 wake_mdsc |= __detach_cap_flush_from_mdsc(mdsc, cf);
3584 if (ci->i_flushing_caps == 0) {
3585 if (list_empty(&ci->i_cap_flush_list)) {
3586 list_del_init(&ci->i_flushing_item);
3587 if (!list_empty(&session->s_cap_flushing)) {
3588 dout(" mds%d still flushing cap on %p\n",
3590 &list_first_entry(&session->s_cap_flushing,
3591 struct ceph_inode_info,
3592 i_flushing_item)->vfs_inode);
3595 mdsc->num_cap_flushing--;
3596 dout(" inode %p now !flushing\n", inode);
3598 if (ci->i_dirty_caps == 0) {
3599 dout(" inode %p now clean\n", inode);
3600 BUG_ON(!list_empty(&ci->i_dirty_item));
3602 if (ci->i_wr_ref == 0 &&
3603 ci->i_wrbuffer_ref_head == 0) {
3604 BUG_ON(!ci->i_head_snapc);
3605 ceph_put_snap_context(ci->i_head_snapc);
3606 ci->i_head_snapc = NULL;
3609 BUG_ON(list_empty(&ci->i_dirty_item));
3612 spin_unlock(&mdsc->cap_dirty_lock);
3615 spin_unlock(&ci->i_ceph_lock);
3617 while (!list_empty(&to_remove)) {
3618 cf = list_first_entry(&to_remove,
3619 struct ceph_cap_flush, i_list);
3620 list_del(&cf->i_list);
3621 ceph_free_cap_flush(cf);
3625 wake_up_all(&ci->i_cap_wq);
3627 wake_up_all(&mdsc->cap_flushing_wq);
3633 * Handle FLUSHSNAP_ACK. MDS has flushed snap data to disk and we can
3634 * throw away our cap_snap.
3636 * Caller hold s_mutex.
3638 static void handle_cap_flushsnap_ack(struct inode *inode, u64 flush_tid,
3639 struct ceph_mds_caps *m,
3640 struct ceph_mds_session *session)
3642 struct ceph_inode_info *ci = ceph_inode(inode);
3643 struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
3644 u64 follows = le64_to_cpu(m->snap_follows);
3645 struct ceph_cap_snap *capsnap;
3646 bool flushed = false;
3647 bool wake_ci = false;
3648 bool wake_mdsc = false;
3650 dout("handle_cap_flushsnap_ack inode %p ci %p mds%d follows %lld\n",
3651 inode, ci, session->s_mds, follows);
3653 spin_lock(&ci->i_ceph_lock);
3654 list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) {
3655 if (capsnap->follows == follows) {
3656 if (capsnap->cap_flush.tid != flush_tid) {
3657 dout(" cap_snap %p follows %lld tid %lld !="
3658 " %lld\n", capsnap, follows,
3659 flush_tid, capsnap->cap_flush.tid);
3665 dout(" skipping cap_snap %p follows %lld\n",
3666 capsnap, capsnap->follows);
3670 WARN_ON(capsnap->dirty_pages || capsnap->writing);
3671 dout(" removing %p cap_snap %p follows %lld\n",
3672 inode, capsnap, follows);
3673 list_del(&capsnap->ci_item);
3674 wake_ci |= __detach_cap_flush_from_ci(ci, &capsnap->cap_flush);
3676 spin_lock(&mdsc->cap_dirty_lock);
3678 if (list_empty(&ci->i_cap_flush_list))
3679 list_del_init(&ci->i_flushing_item);
3681 wake_mdsc |= __detach_cap_flush_from_mdsc(mdsc,
3682 &capsnap->cap_flush);
3683 spin_unlock(&mdsc->cap_dirty_lock);
3685 spin_unlock(&ci->i_ceph_lock);
3687 ceph_put_snap_context(capsnap->context);
3688 ceph_put_cap_snap(capsnap);
3690 wake_up_all(&ci->i_cap_wq);
3692 wake_up_all(&mdsc->cap_flushing_wq);
3698 * Handle TRUNC from MDS, indicating file truncation.
3700 * caller hold s_mutex.
3702 static bool handle_cap_trunc(struct inode *inode,
3703 struct ceph_mds_caps *trunc,
3704 struct ceph_mds_session *session)
3706 struct ceph_inode_info *ci = ceph_inode(inode);
3707 int mds = session->s_mds;
3708 int seq = le32_to_cpu(trunc->seq);
3709 u32 truncate_seq = le32_to_cpu(trunc->truncate_seq);
3710 u64 truncate_size = le64_to_cpu(trunc->truncate_size);
3711 u64 size = le64_to_cpu(trunc->size);
3712 int implemented = 0;
3713 int dirty = __ceph_caps_dirty(ci);
3714 int issued = __ceph_caps_issued(ceph_inode(inode), &implemented);
3715 bool queue_trunc = false;
3717 lockdep_assert_held(&ci->i_ceph_lock);
3719 issued |= implemented | dirty;
3721 dout("handle_cap_trunc inode %p mds%d seq %d to %lld seq %d\n",
3722 inode, mds, seq, truncate_size, truncate_seq);
3723 queue_trunc = ceph_fill_file_size(inode, issued,
3724 truncate_seq, truncate_size, size);
3729 * Handle EXPORT from MDS. Cap is being migrated _from_ this mds to a
3730 * different one. If we are the most recent migration we've seen (as
3731 * indicated by mseq), make note of the migrating cap bits for the
3732 * duration (until we see the corresponding IMPORT).
3734 * caller holds s_mutex
3736 static void handle_cap_export(struct inode *inode, struct ceph_mds_caps *ex,
3737 struct ceph_mds_cap_peer *ph,
3738 struct ceph_mds_session *session)
3740 struct ceph_mds_client *mdsc = ceph_inode_to_client(inode)->mdsc;
3741 struct ceph_mds_session *tsession = NULL;
3742 struct ceph_cap *cap, *tcap, *new_cap = NULL;
3743 struct ceph_inode_info *ci = ceph_inode(inode);
3745 unsigned mseq = le32_to_cpu(ex->migrate_seq);
3746 unsigned t_seq, t_mseq;
3748 int mds = session->s_mds;
3751 t_cap_id = le64_to_cpu(ph->cap_id);
3752 t_seq = le32_to_cpu(ph->seq);
3753 t_mseq = le32_to_cpu(ph->mseq);
3754 target = le32_to_cpu(ph->mds);
3756 t_cap_id = t_seq = t_mseq = 0;
3760 dout("handle_cap_export inode %p ci %p mds%d mseq %d target %d\n",
3761 inode, ci, mds, mseq, target);
3763 spin_lock(&ci->i_ceph_lock);
3764 cap = __get_cap_for_mds(ci, mds);
3765 if (!cap || cap->cap_id != le64_to_cpu(ex->cap_id))
3769 __ceph_remove_cap(cap, false);
3774 * now we know we haven't received the cap import message yet
3775 * because the exported cap still exist.
3778 issued = cap->issued;
3779 if (issued != cap->implemented)
3780 pr_err_ratelimited("handle_cap_export: issued != implemented: "
3781 "ino (%llx.%llx) mds%d seq %d mseq %d "
3782 "issued %s implemented %s\n",
3783 ceph_vinop(inode), mds, cap->seq, cap->mseq,
3784 ceph_cap_string(issued),
3785 ceph_cap_string(cap->implemented));
3788 tcap = __get_cap_for_mds(ci, target);
3790 /* already have caps from the target */
3791 if (tcap->cap_id == t_cap_id &&
3792 ceph_seq_cmp(tcap->seq, t_seq) < 0) {
3793 dout(" updating import cap %p mds%d\n", tcap, target);
3794 tcap->cap_id = t_cap_id;
3795 tcap->seq = t_seq - 1;
3796 tcap->issue_seq = t_seq - 1;
3797 tcap->issued |= issued;
3798 tcap->implemented |= issued;
3799 if (cap == ci->i_auth_cap) {
3800 ci->i_auth_cap = tcap;
3801 change_auth_cap_ses(ci, tcap->session);
3804 __ceph_remove_cap(cap, false);
3806 } else if (tsession) {
3807 /* add placeholder for the export tagert */
3808 int flag = (cap == ci->i_auth_cap) ? CEPH_CAP_FLAG_AUTH : 0;
3810 ceph_add_cap(inode, tsession, t_cap_id, issued, 0,
3811 t_seq - 1, t_mseq, (u64)-1, flag, &new_cap);
3813 if (!list_empty(&ci->i_cap_flush_list) &&
3814 ci->i_auth_cap == tcap) {
3815 spin_lock(&mdsc->cap_dirty_lock);
3816 list_move_tail(&ci->i_flushing_item,
3817 &tcap->session->s_cap_flushing);
3818 spin_unlock(&mdsc->cap_dirty_lock);
3821 __ceph_remove_cap(cap, false);
3825 spin_unlock(&ci->i_ceph_lock);
3826 mutex_unlock(&session->s_mutex);
3828 /* open target session */
3829 tsession = ceph_mdsc_open_export_target_session(mdsc, target);
3830 if (!IS_ERR(tsession)) {
3832 mutex_lock(&session->s_mutex);
3833 mutex_lock_nested(&tsession->s_mutex,
3834 SINGLE_DEPTH_NESTING);
3836 mutex_lock(&tsession->s_mutex);
3837 mutex_lock_nested(&session->s_mutex,
3838 SINGLE_DEPTH_NESTING);
3840 new_cap = ceph_get_cap(mdsc, NULL);
3845 mutex_lock(&session->s_mutex);
3850 spin_unlock(&ci->i_ceph_lock);
3851 mutex_unlock(&session->s_mutex);
3853 mutex_unlock(&tsession->s_mutex);
3854 ceph_put_mds_session(tsession);
3857 ceph_put_cap(mdsc, new_cap);
3861 * Handle cap IMPORT.
3863 * caller holds s_mutex. acquires i_ceph_lock
3865 static void handle_cap_import(struct ceph_mds_client *mdsc,
3866 struct inode *inode, struct ceph_mds_caps *im,
3867 struct ceph_mds_cap_peer *ph,
3868 struct ceph_mds_session *session,
3869 struct ceph_cap **target_cap, int *old_issued)
3871 struct ceph_inode_info *ci = ceph_inode(inode);
3872 struct ceph_cap *cap, *ocap, *new_cap = NULL;
3873 int mds = session->s_mds;
3875 unsigned caps = le32_to_cpu(im->caps);
3876 unsigned wanted = le32_to_cpu(im->wanted);
3877 unsigned seq = le32_to_cpu(im->seq);
3878 unsigned mseq = le32_to_cpu(im->migrate_seq);
3879 u64 realmino = le64_to_cpu(im->realm);
3880 u64 cap_id = le64_to_cpu(im->cap_id);
3885 p_cap_id = le64_to_cpu(ph->cap_id);
3886 peer = le32_to_cpu(ph->mds);
3892 dout("handle_cap_import inode %p ci %p mds%d mseq %d peer %d\n",
3893 inode, ci, mds, mseq, peer);
3895 cap = __get_cap_for_mds(ci, mds);
3898 spin_unlock(&ci->i_ceph_lock);
3899 new_cap = ceph_get_cap(mdsc, NULL);
3900 spin_lock(&ci->i_ceph_lock);
3906 ceph_put_cap(mdsc, new_cap);
3911 __ceph_caps_issued(ci, &issued);
3912 issued |= __ceph_caps_dirty(ci);
3914 ceph_add_cap(inode, session, cap_id, caps, wanted, seq, mseq,
3915 realmino, CEPH_CAP_FLAG_AUTH, &new_cap);
3917 ocap = peer >= 0 ? __get_cap_for_mds(ci, peer) : NULL;
3918 if (ocap && ocap->cap_id == p_cap_id) {
3919 dout(" remove export cap %p mds%d flags %d\n",
3920 ocap, peer, ph->flags);
3921 if ((ph->flags & CEPH_CAP_FLAG_AUTH) &&
3922 (ocap->seq != le32_to_cpu(ph->seq) ||
3923 ocap->mseq != le32_to_cpu(ph->mseq))) {
3924 pr_err_ratelimited("handle_cap_import: "
3925 "mismatched seq/mseq: ino (%llx.%llx) "
3926 "mds%d seq %d mseq %d importer mds%d "
3927 "has peer seq %d mseq %d\n",
3928 ceph_vinop(inode), peer, ocap->seq,
3929 ocap->mseq, mds, le32_to_cpu(ph->seq),
3930 le32_to_cpu(ph->mseq));
3932 __ceph_remove_cap(ocap, (ph->flags & CEPH_CAP_FLAG_RELEASE));
3935 *old_issued = issued;
3940 * Handle a caps message from the MDS.
3942 * Identify the appropriate session, inode, and call the right handler
3943 * based on the cap op.
3945 void ceph_handle_caps(struct ceph_mds_session *session,
3946 struct ceph_msg *msg)
3948 struct ceph_mds_client *mdsc = session->s_mdsc;
3949 struct inode *inode;
3950 struct ceph_inode_info *ci;
3951 struct ceph_cap *cap;
3952 struct ceph_mds_caps *h;
3953 struct ceph_mds_cap_peer *peer = NULL;
3954 struct ceph_snap_realm *realm = NULL;
3956 int msg_version = le16_to_cpu(msg->hdr.version);
3958 struct ceph_vino vino;
3960 size_t snaptrace_len;
3962 struct cap_extra_info extra_info = {};
3965 dout("handle_caps from mds%d\n", session->s_mds);
3968 end = msg->front.iov_base + msg->front.iov_len;
3969 if (msg->front.iov_len < sizeof(*h))
3971 h = msg->front.iov_base;
3972 op = le32_to_cpu(h->op);
3973 vino.ino = le64_to_cpu(h->ino);
3974 vino.snap = CEPH_NOSNAP;
3975 seq = le32_to_cpu(h->seq);
3976 mseq = le32_to_cpu(h->migrate_seq);
3979 snaptrace_len = le32_to_cpu(h->snap_trace_len);
3980 p = snaptrace + snaptrace_len;
3982 if (msg_version >= 2) {
3984 ceph_decode_32_safe(&p, end, flock_len, bad);
3985 if (p + flock_len > end)
3990 if (msg_version >= 3) {
3991 if (op == CEPH_CAP_OP_IMPORT) {
3992 if (p + sizeof(*peer) > end)
3996 } else if (op == CEPH_CAP_OP_EXPORT) {
3997 /* recorded in unused fields */
3998 peer = (void *)&h->size;
4002 if (msg_version >= 4) {
4003 ceph_decode_64_safe(&p, end, extra_info.inline_version, bad);
4004 ceph_decode_32_safe(&p, end, extra_info.inline_len, bad);
4005 if (p + extra_info.inline_len > end)
4007 extra_info.inline_data = p;
4008 p += extra_info.inline_len;
4011 if (msg_version >= 5) {
4012 struct ceph_osd_client *osdc = &mdsc->fsc->client->osdc;
4015 ceph_decode_32_safe(&p, end, epoch_barrier, bad);
4016 ceph_osdc_update_epoch_barrier(osdc, epoch_barrier);
4019 if (msg_version >= 8) {
4021 u32 caller_uid, caller_gid;
4025 ceph_decode_64_safe(&p, end, flush_tid, bad);
4027 ceph_decode_32_safe(&p, end, caller_uid, bad);
4028 ceph_decode_32_safe(&p, end, caller_gid, bad);
4030 ceph_decode_32_safe(&p, end, pool_ns_len, bad);
4031 if (pool_ns_len > 0) {
4032 ceph_decode_need(&p, end, pool_ns_len, bad);
4033 extra_info.pool_ns =
4034 ceph_find_or_create_string(p, pool_ns_len);
4039 if (msg_version >= 9) {
4040 struct ceph_timespec *btime;
4042 if (p + sizeof(*btime) > end)
4045 ceph_decode_timespec64(&extra_info.btime, btime);
4046 p += sizeof(*btime);
4047 ceph_decode_64_safe(&p, end, extra_info.change_attr, bad);
4050 if (msg_version >= 11) {
4053 ceph_decode_32_safe(&p, end, flags, bad);
4055 extra_info.dirstat_valid = true;
4056 ceph_decode_64_safe(&p, end, extra_info.nfiles, bad);
4057 ceph_decode_64_safe(&p, end, extra_info.nsubdirs, bad);
4061 inode = ceph_find_inode(mdsc->fsc->sb, vino);
4062 ci = ceph_inode(inode);
4063 dout(" op %s ino %llx.%llx inode %p\n", ceph_cap_op_name(op), vino.ino,
4066 mutex_lock(&session->s_mutex);
4068 dout(" mds%d seq %lld cap seq %u\n", session->s_mds, session->s_seq,
4072 dout(" i don't have ino %llx\n", vino.ino);
4074 if (op == CEPH_CAP_OP_IMPORT) {
4075 cap = ceph_get_cap(mdsc, NULL);
4076 cap->cap_ino = vino.ino;
4077 cap->queue_release = 1;
4078 cap->cap_id = le64_to_cpu(h->cap_id);
4081 cap->issue_seq = seq;
4082 spin_lock(&session->s_cap_lock);
4083 __ceph_queue_cap_release(session, cap);
4084 spin_unlock(&session->s_cap_lock);
4086 goto flush_cap_releases;
4089 /* these will work even if we don't have a cap yet */
4091 case CEPH_CAP_OP_FLUSHSNAP_ACK:
4092 handle_cap_flushsnap_ack(inode, le64_to_cpu(msg->hdr.tid),
4096 case CEPH_CAP_OP_EXPORT:
4097 handle_cap_export(inode, h, peer, session);
4100 case CEPH_CAP_OP_IMPORT:
4102 if (snaptrace_len) {
4103 down_write(&mdsc->snap_rwsem);
4104 ceph_update_snap_trace(mdsc, snaptrace,
4105 snaptrace + snaptrace_len,
4107 downgrade_write(&mdsc->snap_rwsem);
4109 down_read(&mdsc->snap_rwsem);
4111 spin_lock(&ci->i_ceph_lock);
4112 handle_cap_import(mdsc, inode, h, peer, session,
4113 &cap, &extra_info.issued);
4114 handle_cap_grant(inode, session, cap,
4115 h, msg->middle, &extra_info);
4117 ceph_put_snap_realm(mdsc, realm);
4121 /* the rest require a cap */
4122 spin_lock(&ci->i_ceph_lock);
4123 cap = __get_cap_for_mds(ceph_inode(inode), session->s_mds);
4125 dout(" no cap on %p ino %llx.%llx from mds%d\n",
4126 inode, ceph_ino(inode), ceph_snap(inode),
4128 spin_unlock(&ci->i_ceph_lock);
4129 goto flush_cap_releases;
4132 /* note that each of these drops i_ceph_lock for us */
4134 case CEPH_CAP_OP_REVOKE:
4135 case CEPH_CAP_OP_GRANT:
4136 __ceph_caps_issued(ci, &extra_info.issued);
4137 extra_info.issued |= __ceph_caps_dirty(ci);
4138 handle_cap_grant(inode, session, cap,
4139 h, msg->middle, &extra_info);
4142 case CEPH_CAP_OP_FLUSH_ACK:
4143 handle_cap_flush_ack(inode, le64_to_cpu(msg->hdr.tid),
4147 case CEPH_CAP_OP_TRUNC:
4148 queue_trunc = handle_cap_trunc(inode, h, session);
4149 spin_unlock(&ci->i_ceph_lock);
4151 ceph_queue_vmtruncate(inode);
4155 spin_unlock(&ci->i_ceph_lock);
4156 pr_err("ceph_handle_caps: unknown cap op %d %s\n", op,
4157 ceph_cap_op_name(op));
4161 mutex_unlock(&session->s_mutex);
4163 ceph_put_string(extra_info.pool_ns);
4164 /* avoid calling iput_final() in mds dispatch threads */
4165 ceph_async_iput(inode);
4170 * send any cap release message to try to move things
4171 * along for the mds (who clearly thinks we still have this
4174 ceph_flush_cap_releases(mdsc, session);
4178 pr_err("ceph_handle_caps: corrupt message\n");
4184 * Delayed work handler to process end of delayed cap release LRU list.
4186 void ceph_check_delayed_caps(struct ceph_mds_client *mdsc)
4188 struct inode *inode;
4189 struct ceph_inode_info *ci;
4191 dout("check_delayed_caps\n");
4192 spin_lock(&mdsc->cap_delay_lock);
4193 while (!list_empty(&mdsc->cap_delay_list)) {
4194 ci = list_first_entry(&mdsc->cap_delay_list,
4195 struct ceph_inode_info,
4197 if ((ci->i_ceph_flags & CEPH_I_FLUSH) == 0 &&
4198 time_before(jiffies, ci->i_hold_caps_max))
4200 list_del_init(&ci->i_cap_delay_list);
4202 inode = igrab(&ci->vfs_inode);
4204 spin_unlock(&mdsc->cap_delay_lock);
4205 dout("check_delayed_caps on %p\n", inode);
4206 ceph_check_caps(ci, 0, NULL);
4207 /* avoid calling iput_final() in tick thread */
4208 ceph_async_iput(inode);
4209 spin_lock(&mdsc->cap_delay_lock);
4212 spin_unlock(&mdsc->cap_delay_lock);
4216 * Flush all dirty caps to the mds
4218 static void flush_dirty_session_caps(struct ceph_mds_session *s)
4220 struct ceph_mds_client *mdsc = s->s_mdsc;
4221 struct ceph_inode_info *ci;
4222 struct inode *inode;
4224 dout("flush_dirty_caps\n");
4225 spin_lock(&mdsc->cap_dirty_lock);
4226 while (!list_empty(&s->s_cap_dirty)) {
4227 ci = list_first_entry(&s->s_cap_dirty, struct ceph_inode_info,
4229 inode = &ci->vfs_inode;
4231 dout("flush_dirty_caps %p\n", inode);
4232 spin_unlock(&mdsc->cap_dirty_lock);
4233 ceph_check_caps(ci, CHECK_CAPS_FLUSH, NULL);
4235 spin_lock(&mdsc->cap_dirty_lock);
4237 spin_unlock(&mdsc->cap_dirty_lock);
4238 dout("flush_dirty_caps done\n");
4241 static void iterate_sessions(struct ceph_mds_client *mdsc,
4242 void (*cb)(struct ceph_mds_session *))
4246 mutex_lock(&mdsc->mutex);
4247 for (mds = 0; mds < mdsc->max_sessions; ++mds) {
4248 struct ceph_mds_session *s;
4250 if (!mdsc->sessions[mds])
4253 s = ceph_get_mds_session(mdsc->sessions[mds]);
4257 mutex_unlock(&mdsc->mutex);
4259 ceph_put_mds_session(s);
4260 mutex_lock(&mdsc->mutex);
4262 mutex_unlock(&mdsc->mutex);
4265 void ceph_flush_dirty_caps(struct ceph_mds_client *mdsc)
4267 iterate_sessions(mdsc, flush_dirty_session_caps);
4270 void __ceph_touch_fmode(struct ceph_inode_info *ci,
4271 struct ceph_mds_client *mdsc, int fmode)
4273 unsigned long now = jiffies;
4274 if (fmode & CEPH_FILE_MODE_RD)
4275 ci->i_last_rd = now;
4276 if (fmode & CEPH_FILE_MODE_WR)
4277 ci->i_last_wr = now;
4278 /* queue periodic check */
4280 __ceph_is_any_real_caps(ci) &&
4281 list_empty(&ci->i_cap_delay_list))
4282 __cap_delay_requeue(mdsc, ci);
4285 void ceph_get_fmode(struct ceph_inode_info *ci, int fmode, int count)
4288 int bits = (fmode << 1) | 1;
4289 spin_lock(&ci->i_ceph_lock);
4290 for (i = 0; i < CEPH_FILE_MODE_BITS; i++) {
4291 if (bits & (1 << i))
4292 ci->i_nr_by_mode[i] += count;
4294 spin_unlock(&ci->i_ceph_lock);
4298 * Drop open file reference. If we were the last open file,
4299 * we may need to release capabilities to the MDS (or schedule
4300 * their delayed release).
4302 void ceph_put_fmode(struct ceph_inode_info *ci, int fmode, int count)
4305 int bits = (fmode << 1) | 1;
4306 spin_lock(&ci->i_ceph_lock);
4307 for (i = 0; i < CEPH_FILE_MODE_BITS; i++) {
4308 if (bits & (1 << i)) {
4309 BUG_ON(ci->i_nr_by_mode[i] < count);
4310 ci->i_nr_by_mode[i] -= count;
4313 spin_unlock(&ci->i_ceph_lock);
4317 * For a soon-to-be unlinked file, drop the LINK caps. If it
4318 * looks like the link count will hit 0, drop any other caps (other
4319 * than PIN) we don't specifically want (due to the file still being
4322 int ceph_drop_caps_for_unlink(struct inode *inode)
4324 struct ceph_inode_info *ci = ceph_inode(inode);
4325 int drop = CEPH_CAP_LINK_SHARED | CEPH_CAP_LINK_EXCL;
4327 spin_lock(&ci->i_ceph_lock);
4328 if (inode->i_nlink == 1) {
4329 drop |= ~(__ceph_caps_wanted(ci) | CEPH_CAP_PIN);
4331 if (__ceph_caps_dirty(ci)) {
4332 struct ceph_mds_client *mdsc =
4333 ceph_inode_to_client(inode)->mdsc;
4334 __cap_delay_requeue_front(mdsc, ci);
4337 spin_unlock(&ci->i_ceph_lock);
4342 * Helpers for embedding cap and dentry lease releases into mds
4345 * @force is used by dentry_release (below) to force inclusion of a
4346 * record for the directory inode, even when there aren't any caps to
4349 int ceph_encode_inode_release(void **p, struct inode *inode,
4350 int mds, int drop, int unless, int force)
4352 struct ceph_inode_info *ci = ceph_inode(inode);
4353 struct ceph_cap *cap;
4354 struct ceph_mds_request_release *rel = *p;
4358 spin_lock(&ci->i_ceph_lock);
4359 used = __ceph_caps_used(ci);
4360 dirty = __ceph_caps_dirty(ci);
4362 dout("encode_inode_release %p mds%d used|dirty %s drop %s unless %s\n",
4363 inode, mds, ceph_cap_string(used|dirty), ceph_cap_string(drop),
4364 ceph_cap_string(unless));
4366 /* only drop unused, clean caps */
4367 drop &= ~(used | dirty);
4369 cap = __get_cap_for_mds(ci, mds);
4370 if (cap && __cap_is_valid(cap)) {
4371 unless &= cap->issued;
4373 if (unless & CEPH_CAP_AUTH_EXCL)
4374 drop &= ~CEPH_CAP_AUTH_SHARED;
4375 if (unless & CEPH_CAP_LINK_EXCL)
4376 drop &= ~CEPH_CAP_LINK_SHARED;
4377 if (unless & CEPH_CAP_XATTR_EXCL)
4378 drop &= ~CEPH_CAP_XATTR_SHARED;
4379 if (unless & CEPH_CAP_FILE_EXCL)
4380 drop &= ~CEPH_CAP_FILE_SHARED;
4383 if (force || (cap->issued & drop)) {
4384 if (cap->issued & drop) {
4385 int wanted = __ceph_caps_wanted(ci);
4386 dout("encode_inode_release %p cap %p "
4387 "%s -> %s, wanted %s -> %s\n", inode, cap,
4388 ceph_cap_string(cap->issued),
4389 ceph_cap_string(cap->issued & ~drop),
4390 ceph_cap_string(cap->mds_wanted),
4391 ceph_cap_string(wanted));
4393 cap->issued &= ~drop;
4394 cap->implemented &= ~drop;
4395 cap->mds_wanted = wanted;
4396 if (cap == ci->i_auth_cap &&
4397 !(wanted & CEPH_CAP_ANY_FILE_WR))
4398 ci->i_requested_max_size = 0;
4400 dout("encode_inode_release %p cap %p %s"
4401 " (force)\n", inode, cap,
4402 ceph_cap_string(cap->issued));
4405 rel->ino = cpu_to_le64(ceph_ino(inode));
4406 rel->cap_id = cpu_to_le64(cap->cap_id);
4407 rel->seq = cpu_to_le32(cap->seq);
4408 rel->issue_seq = cpu_to_le32(cap->issue_seq);
4409 rel->mseq = cpu_to_le32(cap->mseq);
4410 rel->caps = cpu_to_le32(cap->implemented);
4411 rel->wanted = cpu_to_le32(cap->mds_wanted);
4417 dout("encode_inode_release %p cap %p %s (noop)\n",
4418 inode, cap, ceph_cap_string(cap->issued));
4421 spin_unlock(&ci->i_ceph_lock);
4425 int ceph_encode_dentry_release(void **p, struct dentry *dentry,
4427 int mds, int drop, int unless)
4429 struct dentry *parent = NULL;
4430 struct ceph_mds_request_release *rel = *p;
4431 struct ceph_dentry_info *di = ceph_dentry(dentry);
4436 * force an record for the directory caps if we have a dentry lease.
4437 * this is racy (can't take i_ceph_lock and d_lock together), but it
4438 * doesn't have to be perfect; the mds will revoke anything we don't
4441 spin_lock(&dentry->d_lock);
4442 if (di->lease_session && di->lease_session->s_mds == mds)
4445 parent = dget(dentry->d_parent);
4446 dir = d_inode(parent);
4448 spin_unlock(&dentry->d_lock);
4450 ret = ceph_encode_inode_release(p, dir, mds, drop, unless, force);
4453 spin_lock(&dentry->d_lock);
4454 if (ret && di->lease_session && di->lease_session->s_mds == mds) {
4455 dout("encode_dentry_release %p mds%d seq %d\n",
4456 dentry, mds, (int)di->lease_seq);
4457 rel->dname_len = cpu_to_le32(dentry->d_name.len);
4458 memcpy(*p, dentry->d_name.name, dentry->d_name.len);
4459 *p += dentry->d_name.len;
4460 rel->dname_seq = cpu_to_le32(di->lease_seq);
4461 __ceph_mdsc_drop_dentry_lease(dentry);
4463 spin_unlock(&dentry->d_lock);