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 spin_unlock(&session->s_cap_lock);
673 spin_lock(&session->s_cap_lock);
674 list_move_tail(&cap->session_caps, &session->s_caps);
675 spin_unlock(&session->s_cap_lock);
677 if (cap->cap_gen < gen)
678 cap->issued = cap->implemented = CEPH_CAP_PIN;
681 * auth mds of the inode changed. we received the cap export
682 * message, but still haven't received the cap import message.
683 * handle_cap_export() updated the new auth MDS' cap.
685 * "ceph_seq_cmp(seq, cap->seq) <= 0" means we are processing
686 * a message that was send before the cap import message. So
689 if (ceph_seq_cmp(seq, cap->seq) <= 0) {
690 WARN_ON(cap != ci->i_auth_cap);
691 WARN_ON(cap->cap_id != cap_id);
694 issued |= cap->issued;
695 flags |= CEPH_CAP_FLAG_AUTH;
699 if (!ci->i_snap_realm ||
700 ((flags & CEPH_CAP_FLAG_AUTH) &&
701 realmino != (u64)-1 && ci->i_snap_realm->ino != realmino)) {
703 * add this inode to the appropriate snap realm
705 struct ceph_snap_realm *realm = ceph_lookup_snap_realm(mdsc,
708 struct ceph_snap_realm *oldrealm = ci->i_snap_realm;
710 spin_lock(&oldrealm->inodes_with_caps_lock);
711 list_del_init(&ci->i_snap_realm_item);
712 spin_unlock(&oldrealm->inodes_with_caps_lock);
715 spin_lock(&realm->inodes_with_caps_lock);
716 list_add(&ci->i_snap_realm_item,
717 &realm->inodes_with_caps);
718 ci->i_snap_realm = realm;
719 if (realm->ino == ci->i_vino.ino)
720 realm->inode = inode;
721 spin_unlock(&realm->inodes_with_caps_lock);
724 ceph_put_snap_realm(mdsc, oldrealm);
726 pr_err("ceph_add_cap: couldn't find snap realm %llx\n",
732 __check_cap_issue(ci, cap, issued);
735 * If we are issued caps we don't want, or the mds' wanted
736 * value appears to be off, queue a check so we'll release
737 * later and/or update the mds wanted value.
739 actual_wanted = __ceph_caps_wanted(ci);
740 if ((wanted & ~actual_wanted) ||
741 (issued & ~actual_wanted & CEPH_CAP_ANY_WR)) {
742 dout(" issued %s, mds wanted %s, actual %s, queueing\n",
743 ceph_cap_string(issued), ceph_cap_string(wanted),
744 ceph_cap_string(actual_wanted));
745 __cap_delay_requeue(mdsc, ci);
748 if (flags & CEPH_CAP_FLAG_AUTH) {
749 if (!ci->i_auth_cap ||
750 ceph_seq_cmp(ci->i_auth_cap->mseq, mseq) < 0) {
751 if (ci->i_auth_cap &&
752 ci->i_auth_cap->session != cap->session)
753 change_auth_cap_ses(ci, cap->session);
754 ci->i_auth_cap = cap;
755 cap->mds_wanted = wanted;
758 WARN_ON(ci->i_auth_cap == cap);
761 dout("add_cap inode %p (%llx.%llx) cap %p %s now %s seq %d mds%d\n",
762 inode, ceph_vinop(inode), cap, ceph_cap_string(issued),
763 ceph_cap_string(issued|cap->issued), seq, mds);
764 cap->cap_id = cap_id;
765 cap->issued = issued;
766 cap->implemented |= issued;
767 if (ceph_seq_cmp(mseq, cap->mseq) > 0)
768 cap->mds_wanted = wanted;
770 cap->mds_wanted |= wanted;
772 cap->issue_seq = seq;
778 * Return true if cap has not timed out and belongs to the current
779 * generation of the MDS session (i.e. has not gone 'stale' due to
780 * us losing touch with the mds).
782 static int __cap_is_valid(struct ceph_cap *cap)
787 spin_lock(&cap->session->s_gen_ttl_lock);
788 gen = cap->session->s_cap_gen;
789 ttl = cap->session->s_cap_ttl;
790 spin_unlock(&cap->session->s_gen_ttl_lock);
792 if (cap->cap_gen < gen || time_after_eq(jiffies, ttl)) {
793 dout("__cap_is_valid %p cap %p issued %s "
794 "but STALE (gen %u vs %u)\n", &cap->ci->vfs_inode,
795 cap, ceph_cap_string(cap->issued), cap->cap_gen, gen);
803 * Return set of valid cap bits issued to us. Note that caps time
804 * out, and may be invalidated in bulk if the client session times out
805 * and session->s_cap_gen is bumped.
807 int __ceph_caps_issued(struct ceph_inode_info *ci, int *implemented)
809 int have = ci->i_snap_caps;
810 struct ceph_cap *cap;
815 for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
816 cap = rb_entry(p, struct ceph_cap, ci_node);
817 if (!__cap_is_valid(cap))
819 dout("__ceph_caps_issued %p cap %p issued %s\n",
820 &ci->vfs_inode, cap, ceph_cap_string(cap->issued));
823 *implemented |= cap->implemented;
826 * exclude caps issued by non-auth MDS, but are been revoking
827 * by the auth MDS. The non-auth MDS should be revoking/exporting
828 * these caps, but the message is delayed.
830 if (ci->i_auth_cap) {
831 cap = ci->i_auth_cap;
832 have &= ~cap->implemented | cap->issued;
838 * Get cap bits issued by caps other than @ocap
840 int __ceph_caps_issued_other(struct ceph_inode_info *ci, struct ceph_cap *ocap)
842 int have = ci->i_snap_caps;
843 struct ceph_cap *cap;
846 for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
847 cap = rb_entry(p, struct ceph_cap, ci_node);
850 if (!__cap_is_valid(cap))
858 * Move a cap to the end of the LRU (oldest caps at list head, newest
861 static void __touch_cap(struct ceph_cap *cap)
863 struct ceph_mds_session *s = cap->session;
865 spin_lock(&s->s_cap_lock);
866 if (!s->s_cap_iterator) {
867 dout("__touch_cap %p cap %p mds%d\n", &cap->ci->vfs_inode, cap,
869 list_move_tail(&cap->session_caps, &s->s_caps);
871 dout("__touch_cap %p cap %p mds%d NOP, iterating over caps\n",
872 &cap->ci->vfs_inode, cap, s->s_mds);
874 spin_unlock(&s->s_cap_lock);
878 * Check if we hold the given mask. If so, move the cap(s) to the
879 * front of their respective LRUs. (This is the preferred way for
880 * callers to check for caps they want.)
882 int __ceph_caps_issued_mask(struct ceph_inode_info *ci, int mask, int touch)
884 struct ceph_cap *cap;
886 int have = ci->i_snap_caps;
888 if ((have & mask) == mask) {
889 dout("__ceph_caps_issued_mask ino 0x%lx snap issued %s"
890 " (mask %s)\n", ci->vfs_inode.i_ino,
891 ceph_cap_string(have),
892 ceph_cap_string(mask));
896 for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
897 cap = rb_entry(p, struct ceph_cap, ci_node);
898 if (!__cap_is_valid(cap))
900 if ((cap->issued & mask) == mask) {
901 dout("__ceph_caps_issued_mask ino 0x%lx cap %p issued %s"
902 " (mask %s)\n", ci->vfs_inode.i_ino, cap,
903 ceph_cap_string(cap->issued),
904 ceph_cap_string(mask));
910 /* does a combination of caps satisfy mask? */
912 if ((have & mask) == mask) {
913 dout("__ceph_caps_issued_mask ino 0x%lx combo issued %s"
914 " (mask %s)\n", ci->vfs_inode.i_ino,
915 ceph_cap_string(cap->issued),
916 ceph_cap_string(mask));
920 /* touch this + preceding caps */
922 for (q = rb_first(&ci->i_caps); q != p;
924 cap = rb_entry(q, struct ceph_cap,
926 if (!__cap_is_valid(cap))
928 if (cap->issued & mask)
939 int __ceph_caps_issued_mask_metric(struct ceph_inode_info *ci, int mask,
942 struct ceph_fs_client *fsc = ceph_sb_to_client(ci->vfs_inode.i_sb);
945 r = __ceph_caps_issued_mask(ci, mask, touch);
947 ceph_update_cap_hit(&fsc->mdsc->metric);
949 ceph_update_cap_mis(&fsc->mdsc->metric);
954 * Return true if mask caps are currently being revoked by an MDS.
956 int __ceph_caps_revoking_other(struct ceph_inode_info *ci,
957 struct ceph_cap *ocap, int mask)
959 struct ceph_cap *cap;
962 for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
963 cap = rb_entry(p, struct ceph_cap, ci_node);
965 (cap->implemented & ~cap->issued & mask))
971 int ceph_caps_revoking(struct ceph_inode_info *ci, int mask)
973 struct inode *inode = &ci->vfs_inode;
976 spin_lock(&ci->i_ceph_lock);
977 ret = __ceph_caps_revoking_other(ci, NULL, mask);
978 spin_unlock(&ci->i_ceph_lock);
979 dout("ceph_caps_revoking %p %s = %d\n", inode,
980 ceph_cap_string(mask), ret);
984 int __ceph_caps_used(struct ceph_inode_info *ci)
988 used |= CEPH_CAP_PIN;
990 used |= CEPH_CAP_FILE_RD;
991 if (ci->i_rdcache_ref ||
992 (S_ISREG(ci->vfs_inode.i_mode) &&
993 ci->vfs_inode.i_data.nrpages))
994 used |= CEPH_CAP_FILE_CACHE;
996 used |= CEPH_CAP_FILE_WR;
997 if (ci->i_wb_ref || ci->i_wrbuffer_ref)
998 used |= CEPH_CAP_FILE_BUFFER;
1000 used |= CEPH_CAP_FILE_EXCL;
1004 #define FMODE_WAIT_BIAS 1000
1007 * wanted, by virtue of open file modes
1009 int __ceph_caps_file_wanted(struct ceph_inode_info *ci)
1011 const int PIN_SHIFT = ffs(CEPH_FILE_MODE_PIN);
1012 const int RD_SHIFT = ffs(CEPH_FILE_MODE_RD);
1013 const int WR_SHIFT = ffs(CEPH_FILE_MODE_WR);
1014 const int LAZY_SHIFT = ffs(CEPH_FILE_MODE_LAZY);
1015 struct ceph_mount_options *opt =
1016 ceph_inode_to_client(&ci->vfs_inode)->mount_options;
1017 unsigned long used_cutoff = jiffies - opt->caps_wanted_delay_max * HZ;
1018 unsigned long idle_cutoff = jiffies - opt->caps_wanted_delay_min * HZ;
1020 if (S_ISDIR(ci->vfs_inode.i_mode)) {
1023 /* use used_cutoff here, to keep dir's wanted caps longer */
1024 if (ci->i_nr_by_mode[RD_SHIFT] > 0 ||
1025 time_after(ci->i_last_rd, used_cutoff))
1026 want |= CEPH_CAP_ANY_SHARED;
1028 if (ci->i_nr_by_mode[WR_SHIFT] > 0 ||
1029 time_after(ci->i_last_wr, used_cutoff)) {
1030 want |= CEPH_CAP_ANY_SHARED | CEPH_CAP_FILE_EXCL;
1031 if (opt->flags & CEPH_MOUNT_OPT_ASYNC_DIROPS)
1032 want |= CEPH_CAP_ANY_DIR_OPS;
1035 if (want || ci->i_nr_by_mode[PIN_SHIFT] > 0)
1036 want |= CEPH_CAP_PIN;
1042 if (ci->i_nr_by_mode[RD_SHIFT] > 0) {
1043 if (ci->i_nr_by_mode[RD_SHIFT] >= FMODE_WAIT_BIAS ||
1044 time_after(ci->i_last_rd, used_cutoff))
1045 bits |= 1 << RD_SHIFT;
1046 } else if (time_after(ci->i_last_rd, idle_cutoff)) {
1047 bits |= 1 << RD_SHIFT;
1050 if (ci->i_nr_by_mode[WR_SHIFT] > 0) {
1051 if (ci->i_nr_by_mode[WR_SHIFT] >= FMODE_WAIT_BIAS ||
1052 time_after(ci->i_last_wr, used_cutoff))
1053 bits |= 1 << WR_SHIFT;
1054 } else if (time_after(ci->i_last_wr, idle_cutoff)) {
1055 bits |= 1 << WR_SHIFT;
1058 /* check lazyio only when read/write is wanted */
1059 if ((bits & (CEPH_FILE_MODE_RDWR << 1)) &&
1060 ci->i_nr_by_mode[LAZY_SHIFT] > 0)
1061 bits |= 1 << LAZY_SHIFT;
1063 return bits ? ceph_caps_for_mode(bits >> 1) : 0;
1068 * wanted, by virtue of open file modes AND cap refs (buffered/cached data)
1070 int __ceph_caps_wanted(struct ceph_inode_info *ci)
1072 int w = __ceph_caps_file_wanted(ci) | __ceph_caps_used(ci);
1073 if (S_ISDIR(ci->vfs_inode.i_mode)) {
1074 /* we want EXCL if holding caps of dir ops */
1075 if (w & CEPH_CAP_ANY_DIR_OPS)
1076 w |= CEPH_CAP_FILE_EXCL;
1078 /* we want EXCL if dirty data */
1079 if (w & CEPH_CAP_FILE_BUFFER)
1080 w |= CEPH_CAP_FILE_EXCL;
1086 * Return caps we have registered with the MDS(s) as 'wanted'.
1088 int __ceph_caps_mds_wanted(struct ceph_inode_info *ci, bool check)
1090 struct ceph_cap *cap;
1094 for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
1095 cap = rb_entry(p, struct ceph_cap, ci_node);
1096 if (check && !__cap_is_valid(cap))
1098 if (cap == ci->i_auth_cap)
1099 mds_wanted |= cap->mds_wanted;
1101 mds_wanted |= (cap->mds_wanted & ~CEPH_CAP_ANY_FILE_WR);
1106 int ceph_is_any_caps(struct inode *inode)
1108 struct ceph_inode_info *ci = ceph_inode(inode);
1111 spin_lock(&ci->i_ceph_lock);
1112 ret = __ceph_is_any_real_caps(ci);
1113 spin_unlock(&ci->i_ceph_lock);
1118 static void drop_inode_snap_realm(struct ceph_inode_info *ci)
1120 struct ceph_snap_realm *realm = ci->i_snap_realm;
1121 spin_lock(&realm->inodes_with_caps_lock);
1122 list_del_init(&ci->i_snap_realm_item);
1123 ci->i_snap_realm_counter++;
1124 ci->i_snap_realm = NULL;
1125 if (realm->ino == ci->i_vino.ino)
1126 realm->inode = NULL;
1127 spin_unlock(&realm->inodes_with_caps_lock);
1128 ceph_put_snap_realm(ceph_sb_to_client(ci->vfs_inode.i_sb)->mdsc,
1133 * Remove a cap. Take steps to deal with a racing iterate_session_caps.
1135 * caller should hold i_ceph_lock.
1136 * caller will not hold session s_mutex if called from destroy_inode.
1138 void __ceph_remove_cap(struct ceph_cap *cap, bool queue_release)
1140 struct ceph_mds_session *session = cap->session;
1141 struct ceph_inode_info *ci = cap->ci;
1142 struct ceph_mds_client *mdsc =
1143 ceph_sb_to_client(ci->vfs_inode.i_sb)->mdsc;
1146 dout("__ceph_remove_cap %p from %p\n", cap, &ci->vfs_inode);
1148 /* remove from inode's cap rbtree, and clear auth cap */
1149 rb_erase(&cap->ci_node, &ci->i_caps);
1150 if (ci->i_auth_cap == cap) {
1151 WARN_ON_ONCE(!list_empty(&ci->i_dirty_item));
1152 ci->i_auth_cap = NULL;
1155 /* remove from session list */
1156 spin_lock(&session->s_cap_lock);
1157 if (session->s_cap_iterator == cap) {
1158 /* not yet, we are iterating over this very cap */
1159 dout("__ceph_remove_cap delaying %p removal from session %p\n",
1162 list_del_init(&cap->session_caps);
1163 session->s_nr_caps--;
1164 cap->session = NULL;
1167 /* protect backpointer with s_cap_lock: see iterate_session_caps */
1171 * s_cap_reconnect is protected by s_cap_lock. no one changes
1172 * s_cap_gen while session is in the reconnect state.
1174 if (queue_release &&
1175 (!session->s_cap_reconnect || cap->cap_gen == session->s_cap_gen)) {
1176 cap->queue_release = 1;
1178 __ceph_queue_cap_release(session, cap);
1182 cap->queue_release = 0;
1184 cap->cap_ino = ci->i_vino.ino;
1186 spin_unlock(&session->s_cap_lock);
1189 ceph_put_cap(mdsc, cap);
1191 if (!__ceph_is_any_real_caps(ci)) {
1192 /* when reconnect denied, we remove session caps forcibly,
1193 * i_wr_ref can be non-zero. If there are ongoing write,
1194 * keep i_snap_realm.
1196 if (ci->i_wr_ref == 0 && ci->i_snap_realm)
1197 drop_inode_snap_realm(ci);
1199 __cap_delay_cancel(mdsc, ci);
1203 struct cap_msg_args {
1204 struct ceph_mds_session *session;
1205 u64 ino, cid, follows;
1206 u64 flush_tid, oldest_flush_tid, size, max_size;
1209 struct ceph_buffer *xattr_buf;
1210 struct ceph_buffer *old_xattr_buf;
1211 struct timespec64 atime, mtime, ctime, btime;
1212 int op, caps, wanted, dirty;
1213 u32 seq, issue_seq, mseq, time_warp_seq;
1223 * Build and send a cap message to the given MDS.
1225 * Caller should be holding s_mutex.
1227 static int send_cap_msg(struct cap_msg_args *arg)
1229 struct ceph_mds_caps *fc;
1230 struct ceph_msg *msg;
1233 struct ceph_osd_client *osdc = &arg->session->s_mdsc->fsc->client->osdc;
1235 dout("send_cap_msg %s %llx %llx caps %s wanted %s dirty %s"
1236 " seq %u/%u tid %llu/%llu mseq %u follows %lld size %llu/%llu"
1237 " xattr_ver %llu xattr_len %d\n", ceph_cap_op_name(arg->op),
1238 arg->cid, arg->ino, ceph_cap_string(arg->caps),
1239 ceph_cap_string(arg->wanted), ceph_cap_string(arg->dirty),
1240 arg->seq, arg->issue_seq, arg->flush_tid, arg->oldest_flush_tid,
1241 arg->mseq, arg->follows, arg->size, arg->max_size,
1243 arg->xattr_buf ? (int)arg->xattr_buf->vec.iov_len : 0);
1245 /* flock buffer size + inline version + inline data size +
1246 * osd_epoch_barrier + oldest_flush_tid */
1247 extra_len = 4 + 8 + 4 + 4 + 8 + 4 + 4 + 4 + 8 + 8 + 4;
1248 msg = ceph_msg_new(CEPH_MSG_CLIENT_CAPS, sizeof(*fc) + extra_len,
1253 msg->hdr.version = cpu_to_le16(10);
1254 msg->hdr.tid = cpu_to_le64(arg->flush_tid);
1256 fc = msg->front.iov_base;
1257 memset(fc, 0, sizeof(*fc));
1259 fc->cap_id = cpu_to_le64(arg->cid);
1260 fc->op = cpu_to_le32(arg->op);
1261 fc->seq = cpu_to_le32(arg->seq);
1262 fc->issue_seq = cpu_to_le32(arg->issue_seq);
1263 fc->migrate_seq = cpu_to_le32(arg->mseq);
1264 fc->caps = cpu_to_le32(arg->caps);
1265 fc->wanted = cpu_to_le32(arg->wanted);
1266 fc->dirty = cpu_to_le32(arg->dirty);
1267 fc->ino = cpu_to_le64(arg->ino);
1268 fc->snap_follows = cpu_to_le64(arg->follows);
1270 fc->size = cpu_to_le64(arg->size);
1271 fc->max_size = cpu_to_le64(arg->max_size);
1272 ceph_encode_timespec64(&fc->mtime, &arg->mtime);
1273 ceph_encode_timespec64(&fc->atime, &arg->atime);
1274 ceph_encode_timespec64(&fc->ctime, &arg->ctime);
1275 fc->time_warp_seq = cpu_to_le32(arg->time_warp_seq);
1277 fc->uid = cpu_to_le32(from_kuid(&init_user_ns, arg->uid));
1278 fc->gid = cpu_to_le32(from_kgid(&init_user_ns, arg->gid));
1279 fc->mode = cpu_to_le32(arg->mode);
1281 fc->xattr_version = cpu_to_le64(arg->xattr_version);
1282 if (arg->xattr_buf) {
1283 msg->middle = ceph_buffer_get(arg->xattr_buf);
1284 fc->xattr_len = cpu_to_le32(arg->xattr_buf->vec.iov_len);
1285 msg->hdr.middle_len = cpu_to_le32(arg->xattr_buf->vec.iov_len);
1289 /* flock buffer size (version 2) */
1290 ceph_encode_32(&p, 0);
1291 /* inline version (version 4) */
1292 ceph_encode_64(&p, arg->inline_data ? 0 : CEPH_INLINE_NONE);
1293 /* inline data size */
1294 ceph_encode_32(&p, 0);
1296 * osd_epoch_barrier (version 5)
1297 * The epoch_barrier is protected osdc->lock, so READ_ONCE here in
1298 * case it was recently changed
1300 ceph_encode_32(&p, READ_ONCE(osdc->epoch_barrier));
1301 /* oldest_flush_tid (version 6) */
1302 ceph_encode_64(&p, arg->oldest_flush_tid);
1305 * caller_uid/caller_gid (version 7)
1307 * Currently, we don't properly track which caller dirtied the caps
1308 * last, and force a flush of them when there is a conflict. For now,
1309 * just set this to 0:0, to emulate how the MDS has worked up to now.
1311 ceph_encode_32(&p, 0);
1312 ceph_encode_32(&p, 0);
1314 /* pool namespace (version 8) (mds always ignores this) */
1315 ceph_encode_32(&p, 0);
1317 /* btime and change_attr (version 9) */
1318 ceph_encode_timespec64(p, &arg->btime);
1319 p += sizeof(struct ceph_timespec);
1320 ceph_encode_64(&p, arg->change_attr);
1322 /* Advisory flags (version 10) */
1323 ceph_encode_32(&p, arg->flags);
1325 ceph_con_send(&arg->session->s_con, msg);
1330 * Queue cap releases when an inode is dropped from our cache.
1332 void __ceph_remove_caps(struct ceph_inode_info *ci)
1336 /* lock i_ceph_lock, because ceph_d_revalidate(..., LOOKUP_RCU)
1337 * may call __ceph_caps_issued_mask() on a freeing inode. */
1338 spin_lock(&ci->i_ceph_lock);
1339 p = rb_first(&ci->i_caps);
1341 struct ceph_cap *cap = rb_entry(p, struct ceph_cap, ci_node);
1343 __ceph_remove_cap(cap, true);
1345 spin_unlock(&ci->i_ceph_lock);
1349 * Prepare to send a cap message to an MDS. Update the cap state, and populate
1350 * the arg struct with the parameters that will need to be sent. This should
1351 * be done under the i_ceph_lock to guard against changes to cap state.
1353 * Make note of max_size reported/requested from mds, revoked caps
1354 * that have now been implemented.
1356 static void __prep_cap(struct cap_msg_args *arg, struct ceph_cap *cap,
1357 int op, int flags, int used, int want, int retain,
1358 int flushing, u64 flush_tid, u64 oldest_flush_tid)
1360 struct ceph_inode_info *ci = cap->ci;
1361 struct inode *inode = &ci->vfs_inode;
1364 lockdep_assert_held(&ci->i_ceph_lock);
1366 held = cap->issued | cap->implemented;
1367 revoking = cap->implemented & ~cap->issued;
1368 retain &= ~revoking;
1370 dout("%s %p cap %p session %p %s -> %s (revoking %s)\n",
1371 __func__, inode, cap, cap->session,
1372 ceph_cap_string(held), ceph_cap_string(held & retain),
1373 ceph_cap_string(revoking));
1374 BUG_ON((retain & CEPH_CAP_PIN) == 0);
1376 ci->i_ceph_flags &= ~CEPH_I_FLUSH;
1378 cap->issued &= retain; /* drop bits we don't want */
1380 * Wake up any waiters on wanted -> needed transition. This is due to
1381 * the weird transition from buffered to sync IO... we need to flush
1382 * dirty pages _before_ allowing sync writes to avoid reordering.
1384 arg->wake = cap->implemented & ~cap->issued;
1385 cap->implemented &= cap->issued | used;
1386 cap->mds_wanted = want;
1388 arg->session = cap->session;
1389 arg->ino = ceph_vino(inode).ino;
1390 arg->cid = cap->cap_id;
1391 arg->follows = flushing ? ci->i_head_snapc->seq : 0;
1392 arg->flush_tid = flush_tid;
1393 arg->oldest_flush_tid = oldest_flush_tid;
1395 arg->size = inode->i_size;
1396 ci->i_reported_size = arg->size;
1397 arg->max_size = ci->i_wanted_max_size;
1398 if (cap == ci->i_auth_cap) {
1399 if (want & CEPH_CAP_ANY_FILE_WR)
1400 ci->i_requested_max_size = arg->max_size;
1402 ci->i_requested_max_size = 0;
1405 if (flushing & CEPH_CAP_XATTR_EXCL) {
1406 arg->old_xattr_buf = __ceph_build_xattrs_blob(ci);
1407 arg->xattr_version = ci->i_xattrs.version;
1408 arg->xattr_buf = ci->i_xattrs.blob;
1410 arg->xattr_buf = NULL;
1411 arg->old_xattr_buf = NULL;
1414 arg->mtime = inode->i_mtime;
1415 arg->atime = inode->i_atime;
1416 arg->ctime = inode->i_ctime;
1417 arg->btime = ci->i_btime;
1418 arg->change_attr = inode_peek_iversion_raw(inode);
1421 arg->caps = cap->implemented;
1423 arg->dirty = flushing;
1425 arg->seq = cap->seq;
1426 arg->issue_seq = cap->issue_seq;
1427 arg->mseq = cap->mseq;
1428 arg->time_warp_seq = ci->i_time_warp_seq;
1430 arg->uid = inode->i_uid;
1431 arg->gid = inode->i_gid;
1432 arg->mode = inode->i_mode;
1434 arg->inline_data = ci->i_inline_version != CEPH_INLINE_NONE;
1435 if (!(flags & CEPH_CLIENT_CAPS_PENDING_CAPSNAP) &&
1436 !list_empty(&ci->i_cap_snaps)) {
1437 struct ceph_cap_snap *capsnap;
1438 list_for_each_entry_reverse(capsnap, &ci->i_cap_snaps, ci_item) {
1439 if (capsnap->cap_flush.tid)
1441 if (capsnap->need_flush) {
1442 flags |= CEPH_CLIENT_CAPS_PENDING_CAPSNAP;
1451 * Send a cap msg on the given inode.
1453 * Caller should hold snap_rwsem (read), s_mutex.
1455 static void __send_cap(struct ceph_mds_client *mdsc, struct cap_msg_args *arg,
1456 struct ceph_inode_info *ci)
1458 struct inode *inode = &ci->vfs_inode;
1461 ret = send_cap_msg(arg);
1463 pr_err("error sending cap msg, ino (%llx.%llx) "
1464 "flushing %s tid %llu, requeue\n",
1465 ceph_vinop(inode), ceph_cap_string(arg->dirty),
1467 spin_lock(&ci->i_ceph_lock);
1468 __cap_delay_requeue(mdsc, ci);
1469 spin_unlock(&ci->i_ceph_lock);
1472 ceph_buffer_put(arg->old_xattr_buf);
1475 wake_up_all(&ci->i_cap_wq);
1478 static inline int __send_flush_snap(struct inode *inode,
1479 struct ceph_mds_session *session,
1480 struct ceph_cap_snap *capsnap,
1481 u32 mseq, u64 oldest_flush_tid)
1483 struct cap_msg_args arg;
1485 arg.session = session;
1486 arg.ino = ceph_vino(inode).ino;
1488 arg.follows = capsnap->follows;
1489 arg.flush_tid = capsnap->cap_flush.tid;
1490 arg.oldest_flush_tid = oldest_flush_tid;
1492 arg.size = capsnap->size;
1494 arg.xattr_version = capsnap->xattr_version;
1495 arg.xattr_buf = capsnap->xattr_blob;
1496 arg.old_xattr_buf = NULL;
1498 arg.atime = capsnap->atime;
1499 arg.mtime = capsnap->mtime;
1500 arg.ctime = capsnap->ctime;
1501 arg.btime = capsnap->btime;
1502 arg.change_attr = capsnap->change_attr;
1504 arg.op = CEPH_CAP_OP_FLUSHSNAP;
1505 arg.caps = capsnap->issued;
1507 arg.dirty = capsnap->dirty;
1512 arg.time_warp_seq = capsnap->time_warp_seq;
1514 arg.uid = capsnap->uid;
1515 arg.gid = capsnap->gid;
1516 arg.mode = capsnap->mode;
1518 arg.inline_data = capsnap->inline_data;
1522 return send_cap_msg(&arg);
1526 * When a snapshot is taken, clients accumulate dirty metadata on
1527 * inodes with capabilities in ceph_cap_snaps to describe the file
1528 * state at the time the snapshot was taken. This must be flushed
1529 * asynchronously back to the MDS once sync writes complete and dirty
1530 * data is written out.
1532 * Called under i_ceph_lock. Takes s_mutex as needed.
1534 static void __ceph_flush_snaps(struct ceph_inode_info *ci,
1535 struct ceph_mds_session *session)
1536 __releases(ci->i_ceph_lock)
1537 __acquires(ci->i_ceph_lock)
1539 struct inode *inode = &ci->vfs_inode;
1540 struct ceph_mds_client *mdsc = session->s_mdsc;
1541 struct ceph_cap_snap *capsnap;
1542 u64 oldest_flush_tid = 0;
1543 u64 first_tid = 1, last_tid = 0;
1545 dout("__flush_snaps %p session %p\n", inode, session);
1547 list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) {
1549 * we need to wait for sync writes to complete and for dirty
1550 * pages to be written out.
1552 if (capsnap->dirty_pages || capsnap->writing)
1555 /* should be removed by ceph_try_drop_cap_snap() */
1556 BUG_ON(!capsnap->need_flush);
1558 /* only flush each capsnap once */
1559 if (capsnap->cap_flush.tid > 0) {
1560 dout(" already flushed %p, skipping\n", capsnap);
1564 spin_lock(&mdsc->cap_dirty_lock);
1565 capsnap->cap_flush.tid = ++mdsc->last_cap_flush_tid;
1566 list_add_tail(&capsnap->cap_flush.g_list,
1567 &mdsc->cap_flush_list);
1568 if (oldest_flush_tid == 0)
1569 oldest_flush_tid = __get_oldest_flush_tid(mdsc);
1570 if (list_empty(&ci->i_flushing_item)) {
1571 list_add_tail(&ci->i_flushing_item,
1572 &session->s_cap_flushing);
1574 spin_unlock(&mdsc->cap_dirty_lock);
1576 list_add_tail(&capsnap->cap_flush.i_list,
1577 &ci->i_cap_flush_list);
1580 first_tid = capsnap->cap_flush.tid;
1581 last_tid = capsnap->cap_flush.tid;
1584 ci->i_ceph_flags &= ~CEPH_I_FLUSH_SNAPS;
1586 while (first_tid <= last_tid) {
1587 struct ceph_cap *cap = ci->i_auth_cap;
1588 struct ceph_cap_flush *cf;
1591 if (!(cap && cap->session == session)) {
1592 dout("__flush_snaps %p auth cap %p not mds%d, "
1593 "stop\n", inode, cap, session->s_mds);
1598 list_for_each_entry(cf, &ci->i_cap_flush_list, i_list) {
1599 if (cf->tid >= first_tid) {
1607 first_tid = cf->tid + 1;
1609 capsnap = container_of(cf, struct ceph_cap_snap, cap_flush);
1610 refcount_inc(&capsnap->nref);
1611 spin_unlock(&ci->i_ceph_lock);
1613 dout("__flush_snaps %p capsnap %p tid %llu %s\n",
1614 inode, capsnap, cf->tid, ceph_cap_string(capsnap->dirty));
1616 ret = __send_flush_snap(inode, session, capsnap, cap->mseq,
1619 pr_err("__flush_snaps: error sending cap flushsnap, "
1620 "ino (%llx.%llx) tid %llu follows %llu\n",
1621 ceph_vinop(inode), cf->tid, capsnap->follows);
1624 ceph_put_cap_snap(capsnap);
1625 spin_lock(&ci->i_ceph_lock);
1629 void ceph_flush_snaps(struct ceph_inode_info *ci,
1630 struct ceph_mds_session **psession)
1632 struct inode *inode = &ci->vfs_inode;
1633 struct ceph_mds_client *mdsc = ceph_inode_to_client(inode)->mdsc;
1634 struct ceph_mds_session *session = NULL;
1637 dout("ceph_flush_snaps %p\n", inode);
1639 session = *psession;
1641 spin_lock(&ci->i_ceph_lock);
1642 if (!(ci->i_ceph_flags & CEPH_I_FLUSH_SNAPS)) {
1643 dout(" no capsnap needs flush, doing nothing\n");
1646 if (!ci->i_auth_cap) {
1647 dout(" no auth cap (migrating?), doing nothing\n");
1651 mds = ci->i_auth_cap->session->s_mds;
1652 if (session && session->s_mds != mds) {
1653 dout(" oops, wrong session %p mutex\n", session);
1654 mutex_unlock(&session->s_mutex);
1655 ceph_put_mds_session(session);
1659 spin_unlock(&ci->i_ceph_lock);
1660 mutex_lock(&mdsc->mutex);
1661 session = __ceph_lookup_mds_session(mdsc, mds);
1662 mutex_unlock(&mdsc->mutex);
1664 dout(" inverting session/ino locks on %p\n", session);
1665 mutex_lock(&session->s_mutex);
1670 // make sure flushsnap messages are sent in proper order.
1671 if (ci->i_ceph_flags & CEPH_I_KICK_FLUSH)
1672 __kick_flushing_caps(mdsc, session, ci, 0);
1674 __ceph_flush_snaps(ci, session);
1676 spin_unlock(&ci->i_ceph_lock);
1679 *psession = session;
1680 } else if (session) {
1681 mutex_unlock(&session->s_mutex);
1682 ceph_put_mds_session(session);
1684 /* we flushed them all; remove this inode from the queue */
1685 spin_lock(&mdsc->snap_flush_lock);
1686 list_del_init(&ci->i_snap_flush_item);
1687 spin_unlock(&mdsc->snap_flush_lock);
1691 * Mark caps dirty. If inode is newly dirty, return the dirty flags.
1692 * Caller is then responsible for calling __mark_inode_dirty with the
1693 * returned flags value.
1695 int __ceph_mark_dirty_caps(struct ceph_inode_info *ci, int mask,
1696 struct ceph_cap_flush **pcf)
1698 struct ceph_mds_client *mdsc =
1699 ceph_sb_to_client(ci->vfs_inode.i_sb)->mdsc;
1700 struct inode *inode = &ci->vfs_inode;
1701 int was = ci->i_dirty_caps;
1704 lockdep_assert_held(&ci->i_ceph_lock);
1706 if (!ci->i_auth_cap) {
1707 pr_warn("__mark_dirty_caps %p %llx mask %s, "
1708 "but no auth cap (session was closed?)\n",
1709 inode, ceph_ino(inode), ceph_cap_string(mask));
1713 dout("__mark_dirty_caps %p %s dirty %s -> %s\n", &ci->vfs_inode,
1714 ceph_cap_string(mask), ceph_cap_string(was),
1715 ceph_cap_string(was | mask));
1716 ci->i_dirty_caps |= mask;
1718 struct ceph_mds_session *session = ci->i_auth_cap->session;
1720 WARN_ON_ONCE(ci->i_prealloc_cap_flush);
1721 swap(ci->i_prealloc_cap_flush, *pcf);
1723 if (!ci->i_head_snapc) {
1724 WARN_ON_ONCE(!rwsem_is_locked(&mdsc->snap_rwsem));
1725 ci->i_head_snapc = ceph_get_snap_context(
1726 ci->i_snap_realm->cached_context);
1728 dout(" inode %p now dirty snapc %p auth cap %p\n",
1729 &ci->vfs_inode, ci->i_head_snapc, ci->i_auth_cap);
1730 BUG_ON(!list_empty(&ci->i_dirty_item));
1731 spin_lock(&mdsc->cap_dirty_lock);
1732 list_add(&ci->i_dirty_item, &session->s_cap_dirty);
1733 spin_unlock(&mdsc->cap_dirty_lock);
1734 if (ci->i_flushing_caps == 0) {
1736 dirty |= I_DIRTY_SYNC;
1739 WARN_ON_ONCE(!ci->i_prealloc_cap_flush);
1741 BUG_ON(list_empty(&ci->i_dirty_item));
1742 if (((was | ci->i_flushing_caps) & CEPH_CAP_FILE_BUFFER) &&
1743 (mask & CEPH_CAP_FILE_BUFFER))
1744 dirty |= I_DIRTY_DATASYNC;
1745 __cap_delay_requeue(mdsc, ci);
1749 struct ceph_cap_flush *ceph_alloc_cap_flush(void)
1751 return kmem_cache_alloc(ceph_cap_flush_cachep, GFP_KERNEL);
1754 void ceph_free_cap_flush(struct ceph_cap_flush *cf)
1757 kmem_cache_free(ceph_cap_flush_cachep, cf);
1760 static u64 __get_oldest_flush_tid(struct ceph_mds_client *mdsc)
1762 if (!list_empty(&mdsc->cap_flush_list)) {
1763 struct ceph_cap_flush *cf =
1764 list_first_entry(&mdsc->cap_flush_list,
1765 struct ceph_cap_flush, g_list);
1772 * Remove cap_flush from the mdsc's or inode's flushing cap list.
1773 * Return true if caller needs to wake up flush waiters.
1775 static bool __detach_cap_flush_from_mdsc(struct ceph_mds_client *mdsc,
1776 struct ceph_cap_flush *cf)
1778 struct ceph_cap_flush *prev;
1779 bool wake = cf->wake;
1781 if (wake && cf->g_list.prev != &mdsc->cap_flush_list) {
1782 prev = list_prev_entry(cf, g_list);
1786 list_del(&cf->g_list);
1790 static bool __detach_cap_flush_from_ci(struct ceph_inode_info *ci,
1791 struct ceph_cap_flush *cf)
1793 struct ceph_cap_flush *prev;
1794 bool wake = cf->wake;
1796 if (wake && cf->i_list.prev != &ci->i_cap_flush_list) {
1797 prev = list_prev_entry(cf, i_list);
1801 list_del(&cf->i_list);
1806 * Add dirty inode to the flushing list. Assigned a seq number so we
1807 * can wait for caps to flush without starving.
1809 * Called under i_ceph_lock. Returns the flush tid.
1811 static u64 __mark_caps_flushing(struct inode *inode,
1812 struct ceph_mds_session *session, bool wake,
1813 u64 *oldest_flush_tid)
1815 struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
1816 struct ceph_inode_info *ci = ceph_inode(inode);
1817 struct ceph_cap_flush *cf = NULL;
1820 lockdep_assert_held(&ci->i_ceph_lock);
1821 BUG_ON(ci->i_dirty_caps == 0);
1822 BUG_ON(list_empty(&ci->i_dirty_item));
1823 BUG_ON(!ci->i_prealloc_cap_flush);
1825 flushing = ci->i_dirty_caps;
1826 dout("__mark_caps_flushing flushing %s, flushing_caps %s -> %s\n",
1827 ceph_cap_string(flushing),
1828 ceph_cap_string(ci->i_flushing_caps),
1829 ceph_cap_string(ci->i_flushing_caps | flushing));
1830 ci->i_flushing_caps |= flushing;
1831 ci->i_dirty_caps = 0;
1832 dout(" inode %p now !dirty\n", inode);
1834 swap(cf, ci->i_prealloc_cap_flush);
1835 cf->caps = flushing;
1838 spin_lock(&mdsc->cap_dirty_lock);
1839 list_del_init(&ci->i_dirty_item);
1841 cf->tid = ++mdsc->last_cap_flush_tid;
1842 list_add_tail(&cf->g_list, &mdsc->cap_flush_list);
1843 *oldest_flush_tid = __get_oldest_flush_tid(mdsc);
1845 if (list_empty(&ci->i_flushing_item)) {
1846 list_add_tail(&ci->i_flushing_item, &session->s_cap_flushing);
1847 mdsc->num_cap_flushing++;
1849 spin_unlock(&mdsc->cap_dirty_lock);
1851 list_add_tail(&cf->i_list, &ci->i_cap_flush_list);
1857 * try to invalidate mapping pages without blocking.
1859 static int try_nonblocking_invalidate(struct inode *inode)
1861 struct ceph_inode_info *ci = ceph_inode(inode);
1862 u32 invalidating_gen = ci->i_rdcache_gen;
1864 spin_unlock(&ci->i_ceph_lock);
1865 invalidate_mapping_pages(&inode->i_data, 0, -1);
1866 spin_lock(&ci->i_ceph_lock);
1868 if (inode->i_data.nrpages == 0 &&
1869 invalidating_gen == ci->i_rdcache_gen) {
1871 dout("try_nonblocking_invalidate %p success\n", inode);
1872 /* save any racing async invalidate some trouble */
1873 ci->i_rdcache_revoking = ci->i_rdcache_gen - 1;
1876 dout("try_nonblocking_invalidate %p failed\n", inode);
1880 bool __ceph_should_report_size(struct ceph_inode_info *ci)
1882 loff_t size = ci->vfs_inode.i_size;
1883 /* mds will adjust max size according to the reported size */
1884 if (ci->i_flushing_caps & CEPH_CAP_FILE_WR)
1886 if (size >= ci->i_max_size)
1888 /* half of previous max_size increment has been used */
1889 if (ci->i_max_size > ci->i_reported_size &&
1890 (size << 1) >= ci->i_max_size + ci->i_reported_size)
1896 * Swiss army knife function to examine currently used and wanted
1897 * versus held caps. Release, flush, ack revoked caps to mds as
1900 * CHECK_CAPS_AUTHONLY - we should only check the auth cap
1901 * CHECK_CAPS_FLUSH - we should flush any dirty caps immediately, without
1904 void ceph_check_caps(struct ceph_inode_info *ci, int flags,
1905 struct ceph_mds_session *session)
1907 struct ceph_fs_client *fsc = ceph_inode_to_client(&ci->vfs_inode);
1908 struct ceph_mds_client *mdsc = fsc->mdsc;
1909 struct inode *inode = &ci->vfs_inode;
1910 struct ceph_cap *cap;
1911 u64 flush_tid, oldest_flush_tid;
1912 int file_wanted, used, cap_used;
1913 int took_snap_rwsem = 0; /* true if mdsc->snap_rwsem held */
1914 int issued, implemented, want, retain, revoking, flushing = 0;
1915 int mds = -1; /* keep track of how far we've gone through i_caps list
1916 to avoid an infinite loop on retry */
1918 bool queue_invalidate = false;
1919 bool tried_invalidate = false;
1921 spin_lock(&ci->i_ceph_lock);
1922 if (ci->i_ceph_flags & CEPH_I_FLUSH)
1923 flags |= CHECK_CAPS_FLUSH;
1927 spin_lock(&ci->i_ceph_lock);
1929 file_wanted = __ceph_caps_file_wanted(ci);
1930 used = __ceph_caps_used(ci);
1931 issued = __ceph_caps_issued(ci, &implemented);
1932 revoking = implemented & ~issued;
1935 retain = file_wanted | used | CEPH_CAP_PIN;
1936 if (!mdsc->stopping && inode->i_nlink > 0) {
1938 retain |= CEPH_CAP_ANY; /* be greedy */
1939 } else if (S_ISDIR(inode->i_mode) &&
1940 (issued & CEPH_CAP_FILE_SHARED) &&
1941 __ceph_dir_is_complete(ci)) {
1943 * If a directory is complete, we want to keep
1944 * the exclusive cap. So that MDS does not end up
1945 * revoking the shared cap on every create/unlink
1948 if (IS_RDONLY(inode)) {
1949 want = CEPH_CAP_ANY_SHARED;
1951 want |= CEPH_CAP_ANY_SHARED | CEPH_CAP_FILE_EXCL;
1956 retain |= CEPH_CAP_ANY_SHARED;
1958 * keep RD only if we didn't have the file open RW,
1959 * because then the mds would revoke it anyway to
1960 * journal max_size=0.
1962 if (ci->i_max_size == 0)
1963 retain |= CEPH_CAP_ANY_RD;
1967 dout("check_caps %p file_want %s used %s dirty %s flushing %s"
1968 " issued %s revoking %s retain %s %s%s\n", inode,
1969 ceph_cap_string(file_wanted),
1970 ceph_cap_string(used), ceph_cap_string(ci->i_dirty_caps),
1971 ceph_cap_string(ci->i_flushing_caps),
1972 ceph_cap_string(issued), ceph_cap_string(revoking),
1973 ceph_cap_string(retain),
1974 (flags & CHECK_CAPS_AUTHONLY) ? " AUTHONLY" : "",
1975 (flags & CHECK_CAPS_FLUSH) ? " FLUSH" : "");
1978 * If we no longer need to hold onto old our caps, and we may
1979 * have cached pages, but don't want them, then try to invalidate.
1980 * If we fail, it's because pages are locked.... try again later.
1982 if ((!(flags & CHECK_CAPS_NOINVAL) || mdsc->stopping) &&
1983 S_ISREG(inode->i_mode) &&
1984 !(ci->i_wb_ref || ci->i_wrbuffer_ref) && /* no dirty pages... */
1985 inode->i_data.nrpages && /* have cached pages */
1986 (revoking & (CEPH_CAP_FILE_CACHE|
1987 CEPH_CAP_FILE_LAZYIO)) && /* or revoking cache */
1988 !tried_invalidate) {
1989 dout("check_caps trying to invalidate on %p\n", inode);
1990 if (try_nonblocking_invalidate(inode) < 0) {
1991 dout("check_caps queuing invalidate\n");
1992 queue_invalidate = true;
1993 ci->i_rdcache_revoking = ci->i_rdcache_gen;
1995 tried_invalidate = true;
1999 for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
2001 struct cap_msg_args arg;
2003 cap = rb_entry(p, struct ceph_cap, ci_node);
2005 /* avoid looping forever */
2006 if (mds >= cap->mds ||
2007 ((flags & CHECK_CAPS_AUTHONLY) && cap != ci->i_auth_cap))
2010 /* NOTE: no side-effects allowed, until we take s_mutex */
2013 if (ci->i_auth_cap && cap != ci->i_auth_cap)
2014 cap_used &= ~ci->i_auth_cap->issued;
2016 revoking = cap->implemented & ~cap->issued;
2017 dout(" mds%d cap %p used %s issued %s implemented %s revoking %s\n",
2018 cap->mds, cap, ceph_cap_string(cap_used),
2019 ceph_cap_string(cap->issued),
2020 ceph_cap_string(cap->implemented),
2021 ceph_cap_string(revoking));
2023 if (cap == ci->i_auth_cap &&
2024 (cap->issued & CEPH_CAP_FILE_WR)) {
2025 /* request larger max_size from MDS? */
2026 if (ci->i_wanted_max_size > ci->i_max_size &&
2027 ci->i_wanted_max_size > ci->i_requested_max_size) {
2028 dout("requesting new max_size\n");
2032 /* approaching file_max? */
2033 if (__ceph_should_report_size(ci)) {
2034 dout("i_size approaching max_size\n");
2038 /* flush anything dirty? */
2039 if (cap == ci->i_auth_cap) {
2040 if ((flags & CHECK_CAPS_FLUSH) && ci->i_dirty_caps) {
2041 dout("flushing dirty caps\n");
2044 if (ci->i_ceph_flags & CEPH_I_FLUSH_SNAPS) {
2045 dout("flushing snap caps\n");
2050 /* completed revocation? going down and there are no caps? */
2051 if (revoking && (revoking & cap_used) == 0) {
2052 dout("completed revocation of %s\n",
2053 ceph_cap_string(cap->implemented & ~cap->issued));
2057 /* want more caps from mds? */
2058 if (want & ~cap->mds_wanted) {
2059 if (want & ~(cap->mds_wanted | cap->issued))
2061 if (!__cap_is_valid(cap))
2065 /* things we might delay */
2066 if ((cap->issued & ~retain) == 0)
2067 continue; /* nope, all good */
2070 if (session && session != cap->session) {
2071 dout("oops, wrong session %p mutex\n", session);
2072 mutex_unlock(&session->s_mutex);
2076 session = cap->session;
2077 if (mutex_trylock(&session->s_mutex) == 0) {
2078 dout("inverting session/ino locks on %p\n",
2080 session = ceph_get_mds_session(session);
2081 spin_unlock(&ci->i_ceph_lock);
2082 if (took_snap_rwsem) {
2083 up_read(&mdsc->snap_rwsem);
2084 took_snap_rwsem = 0;
2087 mutex_lock(&session->s_mutex);
2088 ceph_put_mds_session(session);
2091 * Because we take the reference while
2092 * holding the i_ceph_lock, it should
2093 * never be NULL. Throw a warning if it
2102 /* kick flushing and flush snaps before sending normal
2104 if (cap == ci->i_auth_cap &&
2106 (CEPH_I_KICK_FLUSH | CEPH_I_FLUSH_SNAPS))) {
2107 if (ci->i_ceph_flags & CEPH_I_KICK_FLUSH)
2108 __kick_flushing_caps(mdsc, session, ci, 0);
2109 if (ci->i_ceph_flags & CEPH_I_FLUSH_SNAPS)
2110 __ceph_flush_snaps(ci, session);
2115 /* take snap_rwsem after session mutex */
2116 if (!took_snap_rwsem) {
2117 if (down_read_trylock(&mdsc->snap_rwsem) == 0) {
2118 dout("inverting snap/in locks on %p\n",
2120 spin_unlock(&ci->i_ceph_lock);
2121 down_read(&mdsc->snap_rwsem);
2122 took_snap_rwsem = 1;
2125 took_snap_rwsem = 1;
2128 if (cap == ci->i_auth_cap && ci->i_dirty_caps) {
2129 flushing = ci->i_dirty_caps;
2130 flush_tid = __mark_caps_flushing(inode, session, false,
2132 if (flags & CHECK_CAPS_FLUSH &&
2133 list_empty(&session->s_cap_dirty))
2134 mflags |= CEPH_CLIENT_CAPS_SYNC;
2138 spin_lock(&mdsc->cap_dirty_lock);
2139 oldest_flush_tid = __get_oldest_flush_tid(mdsc);
2140 spin_unlock(&mdsc->cap_dirty_lock);
2143 mds = cap->mds; /* remember mds, so we don't repeat */
2145 __prep_cap(&arg, cap, CEPH_CAP_OP_UPDATE, mflags, cap_used,
2146 want, retain, flushing, flush_tid, oldest_flush_tid);
2147 spin_unlock(&ci->i_ceph_lock);
2149 __send_cap(mdsc, &arg, ci);
2151 goto retry; /* retake i_ceph_lock and restart our cap scan. */
2154 /* periodically re-calculate caps wanted by open files */
2155 if (__ceph_is_any_real_caps(ci) &&
2156 list_empty(&ci->i_cap_delay_list) &&
2157 (file_wanted & ~CEPH_CAP_PIN) &&
2158 !(used & (CEPH_CAP_FILE_RD | CEPH_CAP_ANY_FILE_WR))) {
2159 __cap_delay_requeue(mdsc, ci);
2162 spin_unlock(&ci->i_ceph_lock);
2164 if (queue_invalidate)
2165 ceph_queue_invalidate(inode);
2168 mutex_unlock(&session->s_mutex);
2169 if (took_snap_rwsem)
2170 up_read(&mdsc->snap_rwsem);
2174 * Try to flush dirty caps back to the auth mds.
2176 static int try_flush_caps(struct inode *inode, u64 *ptid)
2178 struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
2179 struct ceph_inode_info *ci = ceph_inode(inode);
2180 struct ceph_mds_session *session = NULL;
2182 u64 flush_tid = 0, oldest_flush_tid = 0;
2185 spin_lock(&ci->i_ceph_lock);
2187 if (ci->i_dirty_caps && ci->i_auth_cap) {
2188 struct ceph_cap *cap = ci->i_auth_cap;
2189 struct cap_msg_args arg;
2191 if (session != cap->session) {
2192 spin_unlock(&ci->i_ceph_lock);
2194 mutex_unlock(&session->s_mutex);
2195 session = cap->session;
2196 mutex_lock(&session->s_mutex);
2199 if (cap->session->s_state < CEPH_MDS_SESSION_OPEN) {
2200 spin_unlock(&ci->i_ceph_lock);
2204 if (ci->i_ceph_flags &
2205 (CEPH_I_KICK_FLUSH | CEPH_I_FLUSH_SNAPS)) {
2206 if (ci->i_ceph_flags & CEPH_I_KICK_FLUSH)
2207 __kick_flushing_caps(mdsc, session, ci, 0);
2208 if (ci->i_ceph_flags & CEPH_I_FLUSH_SNAPS)
2209 __ceph_flush_snaps(ci, session);
2213 flushing = ci->i_dirty_caps;
2214 flush_tid = __mark_caps_flushing(inode, session, true,
2217 __prep_cap(&arg, cap, CEPH_CAP_OP_FLUSH, CEPH_CLIENT_CAPS_SYNC,
2218 __ceph_caps_used(ci), __ceph_caps_wanted(ci),
2219 (cap->issued | cap->implemented),
2220 flushing, flush_tid, oldest_flush_tid);
2221 spin_unlock(&ci->i_ceph_lock);
2223 __send_cap(mdsc, &arg, ci);
2225 if (!list_empty(&ci->i_cap_flush_list)) {
2226 struct ceph_cap_flush *cf =
2227 list_last_entry(&ci->i_cap_flush_list,
2228 struct ceph_cap_flush, i_list);
2230 flush_tid = cf->tid;
2232 flushing = ci->i_flushing_caps;
2233 spin_unlock(&ci->i_ceph_lock);
2237 mutex_unlock(&session->s_mutex);
2244 * Return true if we've flushed caps through the given flush_tid.
2246 static int caps_are_flushed(struct inode *inode, u64 flush_tid)
2248 struct ceph_inode_info *ci = ceph_inode(inode);
2251 spin_lock(&ci->i_ceph_lock);
2252 if (!list_empty(&ci->i_cap_flush_list)) {
2253 struct ceph_cap_flush * cf =
2254 list_first_entry(&ci->i_cap_flush_list,
2255 struct ceph_cap_flush, i_list);
2256 if (cf->tid <= flush_tid)
2259 spin_unlock(&ci->i_ceph_lock);
2264 * wait for any unsafe requests to complete.
2266 static int unsafe_request_wait(struct inode *inode)
2268 struct ceph_inode_info *ci = ceph_inode(inode);
2269 struct ceph_mds_request *req1 = NULL, *req2 = NULL;
2272 spin_lock(&ci->i_unsafe_lock);
2273 if (S_ISDIR(inode->i_mode) && !list_empty(&ci->i_unsafe_dirops)) {
2274 req1 = list_last_entry(&ci->i_unsafe_dirops,
2275 struct ceph_mds_request,
2277 ceph_mdsc_get_request(req1);
2279 if (!list_empty(&ci->i_unsafe_iops)) {
2280 req2 = list_last_entry(&ci->i_unsafe_iops,
2281 struct ceph_mds_request,
2282 r_unsafe_target_item);
2283 ceph_mdsc_get_request(req2);
2285 spin_unlock(&ci->i_unsafe_lock);
2287 dout("unsafe_request_wait %p wait on tid %llu %llu\n",
2288 inode, req1 ? req1->r_tid : 0ULL, req2 ? req2->r_tid : 0ULL);
2290 ret = !wait_for_completion_timeout(&req1->r_safe_completion,
2291 ceph_timeout_jiffies(req1->r_timeout));
2294 ceph_mdsc_put_request(req1);
2297 ret = !wait_for_completion_timeout(&req2->r_safe_completion,
2298 ceph_timeout_jiffies(req2->r_timeout));
2301 ceph_mdsc_put_request(req2);
2306 int ceph_fsync(struct file *file, loff_t start, loff_t end, int datasync)
2308 struct ceph_file_info *fi = file->private_data;
2309 struct inode *inode = file->f_mapping->host;
2310 struct ceph_inode_info *ci = ceph_inode(inode);
2315 dout("fsync %p%s\n", inode, datasync ? " datasync" : "");
2317 ret = file_write_and_wait_range(file, start, end);
2321 ret = ceph_wait_on_async_create(inode);
2325 dirty = try_flush_caps(inode, &flush_tid);
2326 dout("fsync dirty caps are %s\n", ceph_cap_string(dirty));
2328 err = unsafe_request_wait(inode);
2331 * only wait on non-file metadata writeback (the mds
2332 * can recover size and mtime, so we don't need to
2335 if (!err && (dirty & ~CEPH_CAP_ANY_FILE_WR)) {
2336 err = wait_event_interruptible(ci->i_cap_wq,
2337 caps_are_flushed(inode, flush_tid));
2343 if (errseq_check(&ci->i_meta_err, READ_ONCE(fi->meta_err))) {
2344 spin_lock(&file->f_lock);
2345 err = errseq_check_and_advance(&ci->i_meta_err,
2347 spin_unlock(&file->f_lock);
2352 dout("fsync %p%s result=%d\n", inode, datasync ? " datasync" : "", ret);
2357 * Flush any dirty caps back to the mds. If we aren't asked to wait,
2358 * queue inode for flush but don't do so immediately, because we can
2359 * get by with fewer MDS messages if we wait for data writeback to
2362 int ceph_write_inode(struct inode *inode, struct writeback_control *wbc)
2364 struct ceph_inode_info *ci = ceph_inode(inode);
2368 int wait = (wbc->sync_mode == WB_SYNC_ALL && !wbc->for_sync);
2370 dout("write_inode %p wait=%d\n", inode, wait);
2372 dirty = try_flush_caps(inode, &flush_tid);
2374 err = wait_event_interruptible(ci->i_cap_wq,
2375 caps_are_flushed(inode, flush_tid));
2377 struct ceph_mds_client *mdsc =
2378 ceph_sb_to_client(inode->i_sb)->mdsc;
2380 spin_lock(&ci->i_ceph_lock);
2381 if (__ceph_caps_dirty(ci))
2382 __cap_delay_requeue_front(mdsc, ci);
2383 spin_unlock(&ci->i_ceph_lock);
2388 static void __kick_flushing_caps(struct ceph_mds_client *mdsc,
2389 struct ceph_mds_session *session,
2390 struct ceph_inode_info *ci,
2391 u64 oldest_flush_tid)
2392 __releases(ci->i_ceph_lock)
2393 __acquires(ci->i_ceph_lock)
2395 struct inode *inode = &ci->vfs_inode;
2396 struct ceph_cap *cap;
2397 struct ceph_cap_flush *cf;
2400 u64 last_snap_flush = 0;
2402 ci->i_ceph_flags &= ~CEPH_I_KICK_FLUSH;
2404 list_for_each_entry_reverse(cf, &ci->i_cap_flush_list, i_list) {
2406 last_snap_flush = cf->tid;
2411 list_for_each_entry(cf, &ci->i_cap_flush_list, i_list) {
2412 if (cf->tid < first_tid)
2415 cap = ci->i_auth_cap;
2416 if (!(cap && cap->session == session)) {
2417 pr_err("%p auth cap %p not mds%d ???\n",
2418 inode, cap, session->s_mds);
2422 first_tid = cf->tid + 1;
2425 struct cap_msg_args arg;
2427 dout("kick_flushing_caps %p cap %p tid %llu %s\n",
2428 inode, cap, cf->tid, ceph_cap_string(cf->caps));
2429 __prep_cap(&arg, cap, CEPH_CAP_OP_FLUSH,
2430 (cf->tid < last_snap_flush ?
2431 CEPH_CLIENT_CAPS_PENDING_CAPSNAP : 0),
2432 __ceph_caps_used(ci),
2433 __ceph_caps_wanted(ci),
2434 (cap->issued | cap->implemented),
2435 cf->caps, cf->tid, oldest_flush_tid);
2436 spin_unlock(&ci->i_ceph_lock);
2437 __send_cap(mdsc, &arg, ci);
2439 struct ceph_cap_snap *capsnap =
2440 container_of(cf, struct ceph_cap_snap,
2442 dout("kick_flushing_caps %p capsnap %p tid %llu %s\n",
2443 inode, capsnap, cf->tid,
2444 ceph_cap_string(capsnap->dirty));
2446 refcount_inc(&capsnap->nref);
2447 spin_unlock(&ci->i_ceph_lock);
2449 ret = __send_flush_snap(inode, session, capsnap, cap->mseq,
2452 pr_err("kick_flushing_caps: error sending "
2453 "cap flushsnap, ino (%llx.%llx) "
2454 "tid %llu follows %llu\n",
2455 ceph_vinop(inode), cf->tid,
2459 ceph_put_cap_snap(capsnap);
2462 spin_lock(&ci->i_ceph_lock);
2466 void ceph_early_kick_flushing_caps(struct ceph_mds_client *mdsc,
2467 struct ceph_mds_session *session)
2469 struct ceph_inode_info *ci;
2470 struct ceph_cap *cap;
2471 u64 oldest_flush_tid;
2473 dout("early_kick_flushing_caps mds%d\n", session->s_mds);
2475 spin_lock(&mdsc->cap_dirty_lock);
2476 oldest_flush_tid = __get_oldest_flush_tid(mdsc);
2477 spin_unlock(&mdsc->cap_dirty_lock);
2479 list_for_each_entry(ci, &session->s_cap_flushing, i_flushing_item) {
2480 spin_lock(&ci->i_ceph_lock);
2481 cap = ci->i_auth_cap;
2482 if (!(cap && cap->session == session)) {
2483 pr_err("%p auth cap %p not mds%d ???\n",
2484 &ci->vfs_inode, cap, session->s_mds);
2485 spin_unlock(&ci->i_ceph_lock);
2491 * if flushing caps were revoked, we re-send the cap flush
2492 * in client reconnect stage. This guarantees MDS * processes
2493 * the cap flush message before issuing the flushing caps to
2496 if ((cap->issued & ci->i_flushing_caps) !=
2497 ci->i_flushing_caps) {
2498 /* encode_caps_cb() also will reset these sequence
2499 * numbers. make sure sequence numbers in cap flush
2500 * message match later reconnect message */
2504 __kick_flushing_caps(mdsc, session, ci,
2507 ci->i_ceph_flags |= CEPH_I_KICK_FLUSH;
2510 spin_unlock(&ci->i_ceph_lock);
2514 void ceph_kick_flushing_caps(struct ceph_mds_client *mdsc,
2515 struct ceph_mds_session *session)
2517 struct ceph_inode_info *ci;
2518 struct ceph_cap *cap;
2519 u64 oldest_flush_tid;
2521 lockdep_assert_held(&session->s_mutex);
2523 dout("kick_flushing_caps mds%d\n", session->s_mds);
2525 spin_lock(&mdsc->cap_dirty_lock);
2526 oldest_flush_tid = __get_oldest_flush_tid(mdsc);
2527 spin_unlock(&mdsc->cap_dirty_lock);
2529 list_for_each_entry(ci, &session->s_cap_flushing, i_flushing_item) {
2530 spin_lock(&ci->i_ceph_lock);
2531 cap = ci->i_auth_cap;
2532 if (!(cap && cap->session == session)) {
2533 pr_err("%p auth cap %p not mds%d ???\n",
2534 &ci->vfs_inode, cap, session->s_mds);
2535 spin_unlock(&ci->i_ceph_lock);
2538 if (ci->i_ceph_flags & CEPH_I_KICK_FLUSH) {
2539 __kick_flushing_caps(mdsc, session, ci,
2542 spin_unlock(&ci->i_ceph_lock);
2546 void ceph_kick_flushing_inode_caps(struct ceph_mds_session *session,
2547 struct ceph_inode_info *ci)
2549 struct ceph_mds_client *mdsc = session->s_mdsc;
2550 struct ceph_cap *cap = ci->i_auth_cap;
2552 lockdep_assert_held(&ci->i_ceph_lock);
2554 dout("%s %p flushing %s\n", __func__, &ci->vfs_inode,
2555 ceph_cap_string(ci->i_flushing_caps));
2557 if (!list_empty(&ci->i_cap_flush_list)) {
2558 u64 oldest_flush_tid;
2559 spin_lock(&mdsc->cap_dirty_lock);
2560 list_move_tail(&ci->i_flushing_item,
2561 &cap->session->s_cap_flushing);
2562 oldest_flush_tid = __get_oldest_flush_tid(mdsc);
2563 spin_unlock(&mdsc->cap_dirty_lock);
2565 __kick_flushing_caps(mdsc, session, ci, oldest_flush_tid);
2571 * Take references to capabilities we hold, so that we don't release
2572 * them to the MDS prematurely.
2574 void ceph_take_cap_refs(struct ceph_inode_info *ci, int got,
2575 bool snap_rwsem_locked)
2577 lockdep_assert_held(&ci->i_ceph_lock);
2579 if (got & CEPH_CAP_PIN)
2581 if (got & CEPH_CAP_FILE_RD)
2583 if (got & CEPH_CAP_FILE_CACHE)
2584 ci->i_rdcache_ref++;
2585 if (got & CEPH_CAP_FILE_EXCL)
2587 if (got & CEPH_CAP_FILE_WR) {
2588 if (ci->i_wr_ref == 0 && !ci->i_head_snapc) {
2589 BUG_ON(!snap_rwsem_locked);
2590 ci->i_head_snapc = ceph_get_snap_context(
2591 ci->i_snap_realm->cached_context);
2595 if (got & CEPH_CAP_FILE_BUFFER) {
2596 if (ci->i_wb_ref == 0)
2597 ihold(&ci->vfs_inode);
2599 dout("%s %p wb %d -> %d (?)\n", __func__,
2600 &ci->vfs_inode, ci->i_wb_ref-1, ci->i_wb_ref);
2605 * Try to grab cap references. Specify those refs we @want, and the
2606 * minimal set we @need. Also include the larger offset we are writing
2607 * to (when applicable), and check against max_size here as well.
2608 * Note that caller is responsible for ensuring max_size increases are
2609 * requested from the MDS.
2611 * Returns 0 if caps were not able to be acquired (yet), 1 if succeed,
2612 * or a negative error code. There are 3 speical error codes:
2613 * -EAGAIN: need to sleep but non-blocking is specified
2614 * -EFBIG: ask caller to call check_max_size() and try again.
2615 * -ESTALE: ask caller to call ceph_renew_caps() and try again.
2618 /* first 8 bits are reserved for CEPH_FILE_MODE_FOO */
2619 NON_BLOCKING = (1 << 8),
2620 CHECK_FILELOCK = (1 << 9),
2623 static int try_get_cap_refs(struct inode *inode, int need, int want,
2624 loff_t endoff, int flags, int *got)
2626 struct ceph_inode_info *ci = ceph_inode(inode);
2627 struct ceph_mds_client *mdsc = ceph_inode_to_client(inode)->mdsc;
2629 int have, implemented;
2630 bool snap_rwsem_locked = false;
2632 dout("get_cap_refs %p need %s want %s\n", inode,
2633 ceph_cap_string(need), ceph_cap_string(want));
2636 spin_lock(&ci->i_ceph_lock);
2638 if ((flags & CHECK_FILELOCK) &&
2639 (ci->i_ceph_flags & CEPH_I_ERROR_FILELOCK)) {
2640 dout("try_get_cap_refs %p error filelock\n", inode);
2645 /* finish pending truncate */
2646 while (ci->i_truncate_pending) {
2647 spin_unlock(&ci->i_ceph_lock);
2648 if (snap_rwsem_locked) {
2649 up_read(&mdsc->snap_rwsem);
2650 snap_rwsem_locked = false;
2652 __ceph_do_pending_vmtruncate(inode);
2653 spin_lock(&ci->i_ceph_lock);
2656 have = __ceph_caps_issued(ci, &implemented);
2658 if (have & need & CEPH_CAP_FILE_WR) {
2659 if (endoff >= 0 && endoff > (loff_t)ci->i_max_size) {
2660 dout("get_cap_refs %p endoff %llu > maxsize %llu\n",
2661 inode, endoff, ci->i_max_size);
2662 if (endoff > ci->i_requested_max_size)
2663 ret = ci->i_auth_cap ? -EFBIG : -ESTALE;
2667 * If a sync write is in progress, we must wait, so that we
2668 * can get a final snapshot value for size+mtime.
2670 if (__ceph_have_pending_cap_snap(ci)) {
2671 dout("get_cap_refs %p cap_snap_pending\n", inode);
2676 if ((have & need) == need) {
2678 * Look at (implemented & ~have & not) so that we keep waiting
2679 * on transition from wanted -> needed caps. This is needed
2680 * for WRBUFFER|WR -> WR to avoid a new WR sync write from
2681 * going before a prior buffered writeback happens.
2683 int not = want & ~(have & need);
2684 int revoking = implemented & ~have;
2685 dout("get_cap_refs %p have %s but not %s (revoking %s)\n",
2686 inode, ceph_cap_string(have), ceph_cap_string(not),
2687 ceph_cap_string(revoking));
2688 if ((revoking & not) == 0) {
2689 if (!snap_rwsem_locked &&
2690 !ci->i_head_snapc &&
2691 (need & CEPH_CAP_FILE_WR)) {
2692 if (!down_read_trylock(&mdsc->snap_rwsem)) {
2694 * we can not call down_read() when
2695 * task isn't in TASK_RUNNING state
2697 if (flags & NON_BLOCKING) {
2702 spin_unlock(&ci->i_ceph_lock);
2703 down_read(&mdsc->snap_rwsem);
2704 snap_rwsem_locked = true;
2707 snap_rwsem_locked = true;
2709 if ((have & want) == want)
2713 if (S_ISREG(inode->i_mode) &&
2714 (need & CEPH_CAP_FILE_RD) &&
2715 !(*got & CEPH_CAP_FILE_CACHE))
2716 ceph_disable_fscache_readpage(ci);
2717 ceph_take_cap_refs(ci, *got, true);
2721 int session_readonly = false;
2723 if (ci->i_auth_cap &&
2724 (need & (CEPH_CAP_FILE_WR | CEPH_CAP_FILE_EXCL))) {
2725 struct ceph_mds_session *s = ci->i_auth_cap->session;
2726 spin_lock(&s->s_cap_lock);
2727 session_readonly = s->s_readonly;
2728 spin_unlock(&s->s_cap_lock);
2730 if (session_readonly) {
2731 dout("get_cap_refs %p need %s but mds%d readonly\n",
2732 inode, ceph_cap_string(need), ci->i_auth_cap->mds);
2737 if (READ_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_SHUTDOWN) {
2738 dout("get_cap_refs %p forced umount\n", inode);
2742 mds_wanted = __ceph_caps_mds_wanted(ci, false);
2743 if (need & ~mds_wanted) {
2744 dout("get_cap_refs %p need %s > mds_wanted %s\n",
2745 inode, ceph_cap_string(need),
2746 ceph_cap_string(mds_wanted));
2751 dout("get_cap_refs %p have %s need %s\n", inode,
2752 ceph_cap_string(have), ceph_cap_string(need));
2756 __ceph_touch_fmode(ci, mdsc, flags);
2758 spin_unlock(&ci->i_ceph_lock);
2759 if (snap_rwsem_locked)
2760 up_read(&mdsc->snap_rwsem);
2763 ceph_update_cap_mis(&mdsc->metric);
2765 ceph_update_cap_hit(&mdsc->metric);
2767 dout("get_cap_refs %p ret %d got %s\n", inode,
2768 ret, ceph_cap_string(*got));
2773 * Check the offset we are writing up to against our current
2774 * max_size. If necessary, tell the MDS we want to write to
2777 static void check_max_size(struct inode *inode, loff_t endoff)
2779 struct ceph_inode_info *ci = ceph_inode(inode);
2782 /* do we need to explicitly request a larger max_size? */
2783 spin_lock(&ci->i_ceph_lock);
2784 if (endoff >= ci->i_max_size && endoff > ci->i_wanted_max_size) {
2785 dout("write %p at large endoff %llu, req max_size\n",
2787 ci->i_wanted_max_size = endoff;
2789 /* duplicate ceph_check_caps()'s logic */
2790 if (ci->i_auth_cap &&
2791 (ci->i_auth_cap->issued & CEPH_CAP_FILE_WR) &&
2792 ci->i_wanted_max_size > ci->i_max_size &&
2793 ci->i_wanted_max_size > ci->i_requested_max_size)
2795 spin_unlock(&ci->i_ceph_lock);
2797 ceph_check_caps(ci, CHECK_CAPS_AUTHONLY, NULL);
2800 static inline int get_used_fmode(int caps)
2803 if (caps & CEPH_CAP_FILE_RD)
2804 fmode |= CEPH_FILE_MODE_RD;
2805 if (caps & CEPH_CAP_FILE_WR)
2806 fmode |= CEPH_FILE_MODE_WR;
2810 int ceph_try_get_caps(struct inode *inode, int need, int want,
2811 bool nonblock, int *got)
2815 BUG_ON(need & ~CEPH_CAP_FILE_RD);
2816 BUG_ON(want & ~(CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO |
2817 CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_EXCL |
2818 CEPH_CAP_ANY_DIR_OPS));
2820 ret = ceph_pool_perm_check(inode, need);
2825 flags = get_used_fmode(need | want);
2827 flags |= NON_BLOCKING;
2829 ret = try_get_cap_refs(inode, need, want, 0, flags, got);
2830 /* three special error codes */
2831 if (ret == -EAGAIN || ret == -EFBIG || ret == -ESTALE)
2837 * Wait for caps, and take cap references. If we can't get a WR cap
2838 * due to a small max_size, make sure we check_max_size (and possibly
2839 * ask the mds) so we don't get hung up indefinitely.
2841 int ceph_get_caps(struct file *filp, int need, int want,
2842 loff_t endoff, int *got, struct page **pinned_page)
2844 struct ceph_file_info *fi = filp->private_data;
2845 struct inode *inode = file_inode(filp);
2846 struct ceph_inode_info *ci = ceph_inode(inode);
2847 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
2848 int ret, _got, flags;
2850 ret = ceph_pool_perm_check(inode, need);
2854 if ((fi->fmode & CEPH_FILE_MODE_WR) &&
2855 fi->filp_gen != READ_ONCE(fsc->filp_gen))
2858 flags = get_used_fmode(need | want);
2861 flags &= CEPH_FILE_MODE_MASK;
2862 if (atomic_read(&fi->num_locks))
2863 flags |= CHECK_FILELOCK;
2865 ret = try_get_cap_refs(inode, need, want, endoff,
2867 WARN_ON_ONCE(ret == -EAGAIN);
2869 struct ceph_mds_client *mdsc = fsc->mdsc;
2871 DEFINE_WAIT_FUNC(wait, woken_wake_function);
2873 cw.ino = inode->i_ino;
2874 cw.tgid = current->tgid;
2878 spin_lock(&mdsc->caps_list_lock);
2879 list_add(&cw.list, &mdsc->cap_wait_list);
2880 spin_unlock(&mdsc->caps_list_lock);
2882 /* make sure used fmode not timeout */
2883 ceph_get_fmode(ci, flags, FMODE_WAIT_BIAS);
2884 add_wait_queue(&ci->i_cap_wq, &wait);
2886 flags |= NON_BLOCKING;
2887 while (!(ret = try_get_cap_refs(inode, need, want,
2888 endoff, flags, &_got))) {
2889 if (signal_pending(current)) {
2893 wait_woken(&wait, TASK_INTERRUPTIBLE, MAX_SCHEDULE_TIMEOUT);
2896 remove_wait_queue(&ci->i_cap_wq, &wait);
2897 ceph_put_fmode(ci, flags, FMODE_WAIT_BIAS);
2899 spin_lock(&mdsc->caps_list_lock);
2901 spin_unlock(&mdsc->caps_list_lock);
2907 if ((fi->fmode & CEPH_FILE_MODE_WR) &&
2908 fi->filp_gen != READ_ONCE(fsc->filp_gen)) {
2909 if (ret >= 0 && _got)
2910 ceph_put_cap_refs(ci, _got);
2915 if (ret == -EFBIG || ret == -ESTALE) {
2916 int ret2 = ceph_wait_on_async_create(inode);
2920 if (ret == -EFBIG) {
2921 check_max_size(inode, endoff);
2924 if (ret == -ESTALE) {
2925 /* session was killed, try renew caps */
2926 ret = ceph_renew_caps(inode, flags);
2933 if (S_ISREG(ci->vfs_inode.i_mode) &&
2934 ci->i_inline_version != CEPH_INLINE_NONE &&
2935 (_got & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) &&
2936 i_size_read(inode) > 0) {
2938 find_get_page(inode->i_mapping, 0);
2940 if (PageUptodate(page)) {
2941 *pinned_page = page;
2947 * drop cap refs first because getattr while
2948 * holding * caps refs can cause deadlock.
2950 ceph_put_cap_refs(ci, _got);
2954 * getattr request will bring inline data into
2957 ret = __ceph_do_getattr(inode, NULL,
2958 CEPH_STAT_CAP_INLINE_DATA,
2967 if (S_ISREG(ci->vfs_inode.i_mode) &&
2968 (_got & CEPH_CAP_FILE_RD) && (_got & CEPH_CAP_FILE_CACHE))
2969 ceph_fscache_revalidate_cookie(ci);
2976 * Take cap refs. Caller must already know we hold at least one ref
2977 * on the caps in question or we don't know this is safe.
2979 void ceph_get_cap_refs(struct ceph_inode_info *ci, int caps)
2981 spin_lock(&ci->i_ceph_lock);
2982 ceph_take_cap_refs(ci, caps, false);
2983 spin_unlock(&ci->i_ceph_lock);
2988 * drop cap_snap that is not associated with any snapshot.
2989 * we don't need to send FLUSHSNAP message for it.
2991 static int ceph_try_drop_cap_snap(struct ceph_inode_info *ci,
2992 struct ceph_cap_snap *capsnap)
2994 if (!capsnap->need_flush &&
2995 !capsnap->writing && !capsnap->dirty_pages) {
2996 dout("dropping cap_snap %p follows %llu\n",
2997 capsnap, capsnap->follows);
2998 BUG_ON(capsnap->cap_flush.tid > 0);
2999 ceph_put_snap_context(capsnap->context);
3000 if (!list_is_last(&capsnap->ci_item, &ci->i_cap_snaps))
3001 ci->i_ceph_flags |= CEPH_I_FLUSH_SNAPS;
3003 list_del(&capsnap->ci_item);
3004 ceph_put_cap_snap(capsnap);
3013 * If we released the last ref on any given cap, call ceph_check_caps
3014 * to release (or schedule a release).
3016 * If we are releasing a WR cap (from a sync write), finalize any affected
3017 * cap_snap, and wake up any waiters.
3019 static void __ceph_put_cap_refs(struct ceph_inode_info *ci, int had,
3020 bool skip_checking_caps)
3022 struct inode *inode = &ci->vfs_inode;
3023 int last = 0, put = 0, flushsnaps = 0, wake = 0;
3025 spin_lock(&ci->i_ceph_lock);
3026 if (had & CEPH_CAP_PIN)
3028 if (had & CEPH_CAP_FILE_RD)
3029 if (--ci->i_rd_ref == 0)
3031 if (had & CEPH_CAP_FILE_CACHE)
3032 if (--ci->i_rdcache_ref == 0)
3034 if (had & CEPH_CAP_FILE_EXCL)
3035 if (--ci->i_fx_ref == 0)
3037 if (had & CEPH_CAP_FILE_BUFFER) {
3038 if (--ci->i_wb_ref == 0) {
3042 dout("put_cap_refs %p wb %d -> %d (?)\n",
3043 inode, ci->i_wb_ref+1, ci->i_wb_ref);
3045 if (had & CEPH_CAP_FILE_WR)
3046 if (--ci->i_wr_ref == 0) {
3048 if (__ceph_have_pending_cap_snap(ci)) {
3049 struct ceph_cap_snap *capsnap =
3050 list_last_entry(&ci->i_cap_snaps,
3051 struct ceph_cap_snap,
3053 capsnap->writing = 0;
3054 if (ceph_try_drop_cap_snap(ci, capsnap))
3056 else if (__ceph_finish_cap_snap(ci, capsnap))
3060 if (ci->i_wrbuffer_ref_head == 0 &&
3061 ci->i_dirty_caps == 0 &&
3062 ci->i_flushing_caps == 0) {
3063 BUG_ON(!ci->i_head_snapc);
3064 ceph_put_snap_context(ci->i_head_snapc);
3065 ci->i_head_snapc = NULL;
3067 /* see comment in __ceph_remove_cap() */
3068 if (!__ceph_is_any_real_caps(ci) && ci->i_snap_realm)
3069 drop_inode_snap_realm(ci);
3071 spin_unlock(&ci->i_ceph_lock);
3073 dout("put_cap_refs %p had %s%s%s\n", inode, ceph_cap_string(had),
3074 last ? " last" : "", put ? " put" : "");
3076 if (last && !skip_checking_caps)
3077 ceph_check_caps(ci, 0, NULL);
3078 else if (flushsnaps)
3079 ceph_flush_snaps(ci, NULL);
3081 wake_up_all(&ci->i_cap_wq);
3086 void ceph_put_cap_refs(struct ceph_inode_info *ci, int had)
3088 __ceph_put_cap_refs(ci, had, false);
3091 void ceph_put_cap_refs_no_check_caps(struct ceph_inode_info *ci, int had)
3093 __ceph_put_cap_refs(ci, had, true);
3097 * Release @nr WRBUFFER refs on dirty pages for the given @snapc snap
3098 * context. Adjust per-snap dirty page accounting as appropriate.
3099 * Once all dirty data for a cap_snap is flushed, flush snapped file
3100 * metadata back to the MDS. If we dropped the last ref, call
3103 void ceph_put_wrbuffer_cap_refs(struct ceph_inode_info *ci, int nr,
3104 struct ceph_snap_context *snapc)
3106 struct inode *inode = &ci->vfs_inode;
3107 struct ceph_cap_snap *capsnap = NULL;
3111 bool flush_snaps = false;
3112 bool complete_capsnap = false;
3114 spin_lock(&ci->i_ceph_lock);
3115 ci->i_wrbuffer_ref -= nr;
3116 if (ci->i_wrbuffer_ref == 0) {
3121 if (ci->i_head_snapc == snapc) {
3122 ci->i_wrbuffer_ref_head -= nr;
3123 if (ci->i_wrbuffer_ref_head == 0 &&
3124 ci->i_wr_ref == 0 &&
3125 ci->i_dirty_caps == 0 &&
3126 ci->i_flushing_caps == 0) {
3127 BUG_ON(!ci->i_head_snapc);
3128 ceph_put_snap_context(ci->i_head_snapc);
3129 ci->i_head_snapc = NULL;
3131 dout("put_wrbuffer_cap_refs on %p head %d/%d -> %d/%d %s\n",
3133 ci->i_wrbuffer_ref+nr, ci->i_wrbuffer_ref_head+nr,
3134 ci->i_wrbuffer_ref, ci->i_wrbuffer_ref_head,
3135 last ? " LAST" : "");
3137 list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) {
3138 if (capsnap->context == snapc) {
3144 capsnap->dirty_pages -= nr;
3145 if (capsnap->dirty_pages == 0) {
3146 complete_capsnap = true;
3147 if (!capsnap->writing) {
3148 if (ceph_try_drop_cap_snap(ci, capsnap)) {
3151 ci->i_ceph_flags |= CEPH_I_FLUSH_SNAPS;
3156 dout("put_wrbuffer_cap_refs on %p cap_snap %p "
3157 " snap %lld %d/%d -> %d/%d %s%s\n",
3158 inode, capsnap, capsnap->context->seq,
3159 ci->i_wrbuffer_ref+nr, capsnap->dirty_pages + nr,
3160 ci->i_wrbuffer_ref, capsnap->dirty_pages,
3161 last ? " (wrbuffer last)" : "",
3162 complete_capsnap ? " (complete capsnap)" : "");
3165 spin_unlock(&ci->i_ceph_lock);
3168 ceph_check_caps(ci, 0, NULL);
3169 } else if (flush_snaps) {
3170 ceph_flush_snaps(ci, NULL);
3172 if (complete_capsnap)
3173 wake_up_all(&ci->i_cap_wq);
3175 /* avoid calling iput_final() in osd dispatch threads */
3176 ceph_async_iput(inode);
3181 * Invalidate unlinked inode's aliases, so we can drop the inode ASAP.
3183 static void invalidate_aliases(struct inode *inode)
3185 struct dentry *dn, *prev = NULL;
3187 dout("invalidate_aliases inode %p\n", inode);
3188 d_prune_aliases(inode);
3190 * For non-directory inode, d_find_alias() only returns
3191 * hashed dentry. After calling d_invalidate(), the
3192 * dentry becomes unhashed.
3194 * For directory inode, d_find_alias() can return
3195 * unhashed dentry. But directory inode should have
3196 * one alias at most.
3198 while ((dn = d_find_alias(inode))) {
3212 struct cap_extra_info {
3213 struct ceph_string *pool_ns;
3223 /* currently issued */
3225 struct timespec64 btime;
3229 * Handle a cap GRANT message from the MDS. (Note that a GRANT may
3230 * actually be a revocation if it specifies a smaller cap set.)
3232 * caller holds s_mutex and i_ceph_lock, we drop both.
3234 static void handle_cap_grant(struct inode *inode,
3235 struct ceph_mds_session *session,
3236 struct ceph_cap *cap,
3237 struct ceph_mds_caps *grant,
3238 struct ceph_buffer *xattr_buf,
3239 struct cap_extra_info *extra_info)
3240 __releases(ci->i_ceph_lock)
3241 __releases(session->s_mdsc->snap_rwsem)
3243 struct ceph_inode_info *ci = ceph_inode(inode);
3244 int seq = le32_to_cpu(grant->seq);
3245 int newcaps = le32_to_cpu(grant->caps);
3246 int used, wanted, dirty;
3247 u64 size = le64_to_cpu(grant->size);
3248 u64 max_size = le64_to_cpu(grant->max_size);
3249 unsigned char check_caps = 0;
3250 bool was_stale = cap->cap_gen < session->s_cap_gen;
3252 bool writeback = false;
3253 bool queue_trunc = false;
3254 bool queue_invalidate = false;
3255 bool deleted_inode = false;
3256 bool fill_inline = false;
3258 dout("handle_cap_grant inode %p cap %p mds%d seq %d %s\n",
3259 inode, cap, session->s_mds, seq, ceph_cap_string(newcaps));
3260 dout(" size %llu max_size %llu, i_size %llu\n", size, max_size,
3265 * If CACHE is being revoked, and we have no dirty buffers,
3266 * try to invalidate (once). (If there are dirty buffers, we
3267 * will invalidate _after_ writeback.)
3269 if (S_ISREG(inode->i_mode) && /* don't invalidate readdir cache */
3270 ((cap->issued & ~newcaps) & CEPH_CAP_FILE_CACHE) &&
3271 (newcaps & CEPH_CAP_FILE_LAZYIO) == 0 &&
3272 !(ci->i_wrbuffer_ref || ci->i_wb_ref)) {
3273 if (try_nonblocking_invalidate(inode)) {
3274 /* there were locked pages.. invalidate later
3275 in a separate thread. */
3276 if (ci->i_rdcache_revoking != ci->i_rdcache_gen) {
3277 queue_invalidate = true;
3278 ci->i_rdcache_revoking = ci->i_rdcache_gen;
3284 cap->issued = cap->implemented = CEPH_CAP_PIN;
3287 * auth mds of the inode changed. we received the cap export message,
3288 * but still haven't received the cap import message. handle_cap_export
3289 * updated the new auth MDS' cap.
3291 * "ceph_seq_cmp(seq, cap->seq) <= 0" means we are processing a message
3292 * that was sent before the cap import message. So don't remove caps.
3294 if (ceph_seq_cmp(seq, cap->seq) <= 0) {
3295 WARN_ON(cap != ci->i_auth_cap);
3296 WARN_ON(cap->cap_id != le64_to_cpu(grant->cap_id));
3298 newcaps |= cap->issued;
3301 /* side effects now are allowed */
3302 cap->cap_gen = session->s_cap_gen;
3305 __check_cap_issue(ci, cap, newcaps);
3307 inode_set_max_iversion_raw(inode, extra_info->change_attr);
3309 if ((newcaps & CEPH_CAP_AUTH_SHARED) &&
3310 (extra_info->issued & CEPH_CAP_AUTH_EXCL) == 0) {
3311 inode->i_mode = le32_to_cpu(grant->mode);
3312 inode->i_uid = make_kuid(&init_user_ns, le32_to_cpu(grant->uid));
3313 inode->i_gid = make_kgid(&init_user_ns, le32_to_cpu(grant->gid));
3314 ci->i_btime = extra_info->btime;
3315 dout("%p mode 0%o uid.gid %d.%d\n", inode, inode->i_mode,
3316 from_kuid(&init_user_ns, inode->i_uid),
3317 from_kgid(&init_user_ns, inode->i_gid));
3320 if ((newcaps & CEPH_CAP_LINK_SHARED) &&
3321 (extra_info->issued & CEPH_CAP_LINK_EXCL) == 0) {
3322 set_nlink(inode, le32_to_cpu(grant->nlink));
3323 if (inode->i_nlink == 0 &&
3324 (newcaps & (CEPH_CAP_LINK_SHARED | CEPH_CAP_LINK_EXCL)))
3325 deleted_inode = true;
3328 if ((extra_info->issued & CEPH_CAP_XATTR_EXCL) == 0 &&
3330 int len = le32_to_cpu(grant->xattr_len);
3331 u64 version = le64_to_cpu(grant->xattr_version);
3333 if (version > ci->i_xattrs.version) {
3334 dout(" got new xattrs v%llu on %p len %d\n",
3335 version, inode, len);
3336 if (ci->i_xattrs.blob)
3337 ceph_buffer_put(ci->i_xattrs.blob);
3338 ci->i_xattrs.blob = ceph_buffer_get(xattr_buf);
3339 ci->i_xattrs.version = version;
3340 ceph_forget_all_cached_acls(inode);
3341 ceph_security_invalidate_secctx(inode);
3345 if (newcaps & CEPH_CAP_ANY_RD) {
3346 struct timespec64 mtime, atime, ctime;
3347 /* ctime/mtime/atime? */
3348 ceph_decode_timespec64(&mtime, &grant->mtime);
3349 ceph_decode_timespec64(&atime, &grant->atime);
3350 ceph_decode_timespec64(&ctime, &grant->ctime);
3351 ceph_fill_file_time(inode, extra_info->issued,
3352 le32_to_cpu(grant->time_warp_seq),
3353 &ctime, &mtime, &atime);
3356 if ((newcaps & CEPH_CAP_FILE_SHARED) && extra_info->dirstat_valid) {
3357 ci->i_files = extra_info->nfiles;
3358 ci->i_subdirs = extra_info->nsubdirs;
3361 if (newcaps & (CEPH_CAP_ANY_FILE_RD | CEPH_CAP_ANY_FILE_WR)) {
3362 /* file layout may have changed */
3363 s64 old_pool = ci->i_layout.pool_id;
3364 struct ceph_string *old_ns;
3366 ceph_file_layout_from_legacy(&ci->i_layout, &grant->layout);
3367 old_ns = rcu_dereference_protected(ci->i_layout.pool_ns,
3368 lockdep_is_held(&ci->i_ceph_lock));
3369 rcu_assign_pointer(ci->i_layout.pool_ns, extra_info->pool_ns);
3371 if (ci->i_layout.pool_id != old_pool ||
3372 extra_info->pool_ns != old_ns)
3373 ci->i_ceph_flags &= ~CEPH_I_POOL_PERM;
3375 extra_info->pool_ns = old_ns;
3377 /* size/truncate_seq? */
3378 queue_trunc = ceph_fill_file_size(inode, extra_info->issued,
3379 le32_to_cpu(grant->truncate_seq),
3380 le64_to_cpu(grant->truncate_size),
3384 if (ci->i_auth_cap == cap && (newcaps & CEPH_CAP_ANY_FILE_WR)) {
3385 if (max_size != ci->i_max_size) {
3386 dout("max_size %lld -> %llu\n",
3387 ci->i_max_size, max_size);
3388 ci->i_max_size = max_size;
3389 if (max_size >= ci->i_wanted_max_size) {
3390 ci->i_wanted_max_size = 0; /* reset */
3391 ci->i_requested_max_size = 0;
3397 /* check cap bits */
3398 wanted = __ceph_caps_wanted(ci);
3399 used = __ceph_caps_used(ci);
3400 dirty = __ceph_caps_dirty(ci);
3401 dout(" my wanted = %s, used = %s, dirty %s\n",
3402 ceph_cap_string(wanted),
3403 ceph_cap_string(used),
3404 ceph_cap_string(dirty));
3406 if ((was_stale || le32_to_cpu(grant->op) == CEPH_CAP_OP_IMPORT) &&
3407 (wanted & ~(cap->mds_wanted | newcaps))) {
3409 * If mds is importing cap, prior cap messages that update
3410 * 'wanted' may get dropped by mds (migrate seq mismatch).
3412 * We don't send cap message to update 'wanted' if what we
3413 * want are already issued. If mds revokes caps, cap message
3414 * that releases caps also tells mds what we want. But if
3415 * caps got revoked by mds forcedly (session stale). We may
3416 * haven't told mds what we want.
3421 /* revocation, grant, or no-op? */
3422 if (cap->issued & ~newcaps) {
3423 int revoking = cap->issued & ~newcaps;
3425 dout("revocation: %s -> %s (revoking %s)\n",
3426 ceph_cap_string(cap->issued),
3427 ceph_cap_string(newcaps),
3428 ceph_cap_string(revoking));
3429 if (S_ISREG(inode->i_mode) &&
3430 (revoking & used & CEPH_CAP_FILE_BUFFER))
3431 writeback = true; /* initiate writeback; will delay ack */
3432 else if (queue_invalidate &&
3433 revoking == CEPH_CAP_FILE_CACHE &&
3434 (newcaps & CEPH_CAP_FILE_LAZYIO) == 0)
3435 ; /* do nothing yet, invalidation will be queued */
3436 else if (cap == ci->i_auth_cap)
3437 check_caps = 1; /* check auth cap only */
3439 check_caps = 2; /* check all caps */
3440 cap->issued = newcaps;
3441 cap->implemented |= newcaps;
3442 } else if (cap->issued == newcaps) {
3443 dout("caps unchanged: %s -> %s\n",
3444 ceph_cap_string(cap->issued), ceph_cap_string(newcaps));
3446 dout("grant: %s -> %s\n", ceph_cap_string(cap->issued),
3447 ceph_cap_string(newcaps));
3448 /* non-auth MDS is revoking the newly grant caps ? */
3449 if (cap == ci->i_auth_cap &&
3450 __ceph_caps_revoking_other(ci, cap, newcaps))
3453 cap->issued = newcaps;
3454 cap->implemented |= newcaps; /* add bits only, to
3455 * avoid stepping on a
3456 * pending revocation */
3459 BUG_ON(cap->issued & ~cap->implemented);
3461 if (extra_info->inline_version > 0 &&
3462 extra_info->inline_version >= ci->i_inline_version) {
3463 ci->i_inline_version = extra_info->inline_version;
3464 if (ci->i_inline_version != CEPH_INLINE_NONE &&
3465 (newcaps & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)))
3469 if (ci->i_auth_cap == cap &&
3470 le32_to_cpu(grant->op) == CEPH_CAP_OP_IMPORT) {
3471 if (newcaps & ~extra_info->issued)
3474 if (ci->i_requested_max_size > max_size ||
3475 !(le32_to_cpu(grant->wanted) & CEPH_CAP_ANY_FILE_WR)) {
3476 /* re-request max_size if necessary */
3477 ci->i_requested_max_size = 0;
3481 ceph_kick_flushing_inode_caps(session, ci);
3482 spin_unlock(&ci->i_ceph_lock);
3483 up_read(&session->s_mdsc->snap_rwsem);
3485 spin_unlock(&ci->i_ceph_lock);
3489 ceph_fill_inline_data(inode, NULL, extra_info->inline_data,
3490 extra_info->inline_len);
3493 ceph_queue_vmtruncate(inode);
3497 * queue inode for writeback: we can't actually call
3498 * filemap_write_and_wait, etc. from message handler
3501 ceph_queue_writeback(inode);
3502 if (queue_invalidate)
3503 ceph_queue_invalidate(inode);
3505 invalidate_aliases(inode);
3507 wake_up_all(&ci->i_cap_wq);
3509 if (check_caps == 1)
3510 ceph_check_caps(ci, CHECK_CAPS_AUTHONLY | CHECK_CAPS_NOINVAL,
3512 else if (check_caps == 2)
3513 ceph_check_caps(ci, CHECK_CAPS_NOINVAL, session);
3515 mutex_unlock(&session->s_mutex);
3519 * Handle FLUSH_ACK from MDS, indicating that metadata we sent to the
3520 * MDS has been safely committed.
3522 static void handle_cap_flush_ack(struct inode *inode, u64 flush_tid,
3523 struct ceph_mds_caps *m,
3524 struct ceph_mds_session *session,
3525 struct ceph_cap *cap)
3526 __releases(ci->i_ceph_lock)
3528 struct ceph_inode_info *ci = ceph_inode(inode);
3529 struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
3530 struct ceph_cap_flush *cf, *tmp_cf;
3531 LIST_HEAD(to_remove);
3532 unsigned seq = le32_to_cpu(m->seq);
3533 int dirty = le32_to_cpu(m->dirty);
3536 bool wake_ci = false;
3537 bool wake_mdsc = false;
3539 list_for_each_entry_safe(cf, tmp_cf, &ci->i_cap_flush_list, i_list) {
3540 /* Is this the one that was flushed? */
3541 if (cf->tid == flush_tid)
3544 /* Is this a capsnap? */
3548 if (cf->tid <= flush_tid) {
3550 * An earlier or current tid. The FLUSH_ACK should
3551 * represent a superset of this flush's caps.
3553 wake_ci |= __detach_cap_flush_from_ci(ci, cf);
3554 list_add_tail(&cf->i_list, &to_remove);
3557 * This is a later one. Any caps in it are still dirty
3558 * so don't count them as cleaned.
3560 cleaned &= ~cf->caps;
3566 dout("handle_cap_flush_ack inode %p mds%d seq %d on %s cleaned %s,"
3567 " flushing %s -> %s\n",
3568 inode, session->s_mds, seq, ceph_cap_string(dirty),
3569 ceph_cap_string(cleaned), ceph_cap_string(ci->i_flushing_caps),
3570 ceph_cap_string(ci->i_flushing_caps & ~cleaned));
3572 if (list_empty(&to_remove) && !cleaned)
3575 ci->i_flushing_caps &= ~cleaned;
3577 spin_lock(&mdsc->cap_dirty_lock);
3579 list_for_each_entry(cf, &to_remove, i_list)
3580 wake_mdsc |= __detach_cap_flush_from_mdsc(mdsc, cf);
3582 if (ci->i_flushing_caps == 0) {
3583 if (list_empty(&ci->i_cap_flush_list)) {
3584 list_del_init(&ci->i_flushing_item);
3585 if (!list_empty(&session->s_cap_flushing)) {
3586 dout(" mds%d still flushing cap on %p\n",
3588 &list_first_entry(&session->s_cap_flushing,
3589 struct ceph_inode_info,
3590 i_flushing_item)->vfs_inode);
3593 mdsc->num_cap_flushing--;
3594 dout(" inode %p now !flushing\n", inode);
3596 if (ci->i_dirty_caps == 0) {
3597 dout(" inode %p now clean\n", inode);
3598 BUG_ON(!list_empty(&ci->i_dirty_item));
3600 if (ci->i_wr_ref == 0 &&
3601 ci->i_wrbuffer_ref_head == 0) {
3602 BUG_ON(!ci->i_head_snapc);
3603 ceph_put_snap_context(ci->i_head_snapc);
3604 ci->i_head_snapc = NULL;
3607 BUG_ON(list_empty(&ci->i_dirty_item));
3610 spin_unlock(&mdsc->cap_dirty_lock);
3613 spin_unlock(&ci->i_ceph_lock);
3615 while (!list_empty(&to_remove)) {
3616 cf = list_first_entry(&to_remove,
3617 struct ceph_cap_flush, i_list);
3618 list_del(&cf->i_list);
3619 ceph_free_cap_flush(cf);
3623 wake_up_all(&ci->i_cap_wq);
3625 wake_up_all(&mdsc->cap_flushing_wq);
3631 * Handle FLUSHSNAP_ACK. MDS has flushed snap data to disk and we can
3632 * throw away our cap_snap.
3634 * Caller hold s_mutex.
3636 static void handle_cap_flushsnap_ack(struct inode *inode, u64 flush_tid,
3637 struct ceph_mds_caps *m,
3638 struct ceph_mds_session *session)
3640 struct ceph_inode_info *ci = ceph_inode(inode);
3641 struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
3642 u64 follows = le64_to_cpu(m->snap_follows);
3643 struct ceph_cap_snap *capsnap;
3644 bool flushed = false;
3645 bool wake_ci = false;
3646 bool wake_mdsc = false;
3648 dout("handle_cap_flushsnap_ack inode %p ci %p mds%d follows %lld\n",
3649 inode, ci, session->s_mds, follows);
3651 spin_lock(&ci->i_ceph_lock);
3652 list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) {
3653 if (capsnap->follows == follows) {
3654 if (capsnap->cap_flush.tid != flush_tid) {
3655 dout(" cap_snap %p follows %lld tid %lld !="
3656 " %lld\n", capsnap, follows,
3657 flush_tid, capsnap->cap_flush.tid);
3663 dout(" skipping cap_snap %p follows %lld\n",
3664 capsnap, capsnap->follows);
3668 WARN_ON(capsnap->dirty_pages || capsnap->writing);
3669 dout(" removing %p cap_snap %p follows %lld\n",
3670 inode, capsnap, follows);
3671 list_del(&capsnap->ci_item);
3672 wake_ci |= __detach_cap_flush_from_ci(ci, &capsnap->cap_flush);
3674 spin_lock(&mdsc->cap_dirty_lock);
3676 if (list_empty(&ci->i_cap_flush_list))
3677 list_del_init(&ci->i_flushing_item);
3679 wake_mdsc |= __detach_cap_flush_from_mdsc(mdsc,
3680 &capsnap->cap_flush);
3681 spin_unlock(&mdsc->cap_dirty_lock);
3683 spin_unlock(&ci->i_ceph_lock);
3685 ceph_put_snap_context(capsnap->context);
3686 ceph_put_cap_snap(capsnap);
3688 wake_up_all(&ci->i_cap_wq);
3690 wake_up_all(&mdsc->cap_flushing_wq);
3696 * Handle TRUNC from MDS, indicating file truncation.
3698 * caller hold s_mutex.
3700 static bool handle_cap_trunc(struct inode *inode,
3701 struct ceph_mds_caps *trunc,
3702 struct ceph_mds_session *session)
3704 struct ceph_inode_info *ci = ceph_inode(inode);
3705 int mds = session->s_mds;
3706 int seq = le32_to_cpu(trunc->seq);
3707 u32 truncate_seq = le32_to_cpu(trunc->truncate_seq);
3708 u64 truncate_size = le64_to_cpu(trunc->truncate_size);
3709 u64 size = le64_to_cpu(trunc->size);
3710 int implemented = 0;
3711 int dirty = __ceph_caps_dirty(ci);
3712 int issued = __ceph_caps_issued(ceph_inode(inode), &implemented);
3713 bool queue_trunc = false;
3715 lockdep_assert_held(&ci->i_ceph_lock);
3717 issued |= implemented | dirty;
3719 dout("handle_cap_trunc inode %p mds%d seq %d to %lld seq %d\n",
3720 inode, mds, seq, truncate_size, truncate_seq);
3721 queue_trunc = ceph_fill_file_size(inode, issued,
3722 truncate_seq, truncate_size, size);
3727 * Handle EXPORT from MDS. Cap is being migrated _from_ this mds to a
3728 * different one. If we are the most recent migration we've seen (as
3729 * indicated by mseq), make note of the migrating cap bits for the
3730 * duration (until we see the corresponding IMPORT).
3732 * caller holds s_mutex
3734 static void handle_cap_export(struct inode *inode, struct ceph_mds_caps *ex,
3735 struct ceph_mds_cap_peer *ph,
3736 struct ceph_mds_session *session)
3738 struct ceph_mds_client *mdsc = ceph_inode_to_client(inode)->mdsc;
3739 struct ceph_mds_session *tsession = NULL;
3740 struct ceph_cap *cap, *tcap, *new_cap = NULL;
3741 struct ceph_inode_info *ci = ceph_inode(inode);
3743 unsigned mseq = le32_to_cpu(ex->migrate_seq);
3744 unsigned t_seq, t_mseq;
3746 int mds = session->s_mds;
3749 t_cap_id = le64_to_cpu(ph->cap_id);
3750 t_seq = le32_to_cpu(ph->seq);
3751 t_mseq = le32_to_cpu(ph->mseq);
3752 target = le32_to_cpu(ph->mds);
3754 t_cap_id = t_seq = t_mseq = 0;
3758 dout("handle_cap_export inode %p ci %p mds%d mseq %d target %d\n",
3759 inode, ci, mds, mseq, target);
3761 spin_lock(&ci->i_ceph_lock);
3762 cap = __get_cap_for_mds(ci, mds);
3763 if (!cap || cap->cap_id != le64_to_cpu(ex->cap_id))
3767 __ceph_remove_cap(cap, false);
3772 * now we know we haven't received the cap import message yet
3773 * because the exported cap still exist.
3776 issued = cap->issued;
3777 if (issued != cap->implemented)
3778 pr_err_ratelimited("handle_cap_export: issued != implemented: "
3779 "ino (%llx.%llx) mds%d seq %d mseq %d "
3780 "issued %s implemented %s\n",
3781 ceph_vinop(inode), mds, cap->seq, cap->mseq,
3782 ceph_cap_string(issued),
3783 ceph_cap_string(cap->implemented));
3786 tcap = __get_cap_for_mds(ci, target);
3788 /* already have caps from the target */
3789 if (tcap->cap_id == t_cap_id &&
3790 ceph_seq_cmp(tcap->seq, t_seq) < 0) {
3791 dout(" updating import cap %p mds%d\n", tcap, target);
3792 tcap->cap_id = t_cap_id;
3793 tcap->seq = t_seq - 1;
3794 tcap->issue_seq = t_seq - 1;
3795 tcap->issued |= issued;
3796 tcap->implemented |= issued;
3797 if (cap == ci->i_auth_cap) {
3798 ci->i_auth_cap = tcap;
3799 change_auth_cap_ses(ci, tcap->session);
3802 __ceph_remove_cap(cap, false);
3804 } else if (tsession) {
3805 /* add placeholder for the export tagert */
3806 int flag = (cap == ci->i_auth_cap) ? CEPH_CAP_FLAG_AUTH : 0;
3808 ceph_add_cap(inode, tsession, t_cap_id, issued, 0,
3809 t_seq - 1, t_mseq, (u64)-1, flag, &new_cap);
3811 if (!list_empty(&ci->i_cap_flush_list) &&
3812 ci->i_auth_cap == tcap) {
3813 spin_lock(&mdsc->cap_dirty_lock);
3814 list_move_tail(&ci->i_flushing_item,
3815 &tcap->session->s_cap_flushing);
3816 spin_unlock(&mdsc->cap_dirty_lock);
3819 __ceph_remove_cap(cap, false);
3823 spin_unlock(&ci->i_ceph_lock);
3824 mutex_unlock(&session->s_mutex);
3826 /* open target session */
3827 tsession = ceph_mdsc_open_export_target_session(mdsc, target);
3828 if (!IS_ERR(tsession)) {
3830 mutex_lock(&session->s_mutex);
3831 mutex_lock_nested(&tsession->s_mutex,
3832 SINGLE_DEPTH_NESTING);
3834 mutex_lock(&tsession->s_mutex);
3835 mutex_lock_nested(&session->s_mutex,
3836 SINGLE_DEPTH_NESTING);
3838 new_cap = ceph_get_cap(mdsc, NULL);
3843 mutex_lock(&session->s_mutex);
3848 spin_unlock(&ci->i_ceph_lock);
3849 mutex_unlock(&session->s_mutex);
3851 mutex_unlock(&tsession->s_mutex);
3852 ceph_put_mds_session(tsession);
3855 ceph_put_cap(mdsc, new_cap);
3859 * Handle cap IMPORT.
3861 * caller holds s_mutex. acquires i_ceph_lock
3863 static void handle_cap_import(struct ceph_mds_client *mdsc,
3864 struct inode *inode, struct ceph_mds_caps *im,
3865 struct ceph_mds_cap_peer *ph,
3866 struct ceph_mds_session *session,
3867 struct ceph_cap **target_cap, int *old_issued)
3869 struct ceph_inode_info *ci = ceph_inode(inode);
3870 struct ceph_cap *cap, *ocap, *new_cap = NULL;
3871 int mds = session->s_mds;
3873 unsigned caps = le32_to_cpu(im->caps);
3874 unsigned wanted = le32_to_cpu(im->wanted);
3875 unsigned seq = le32_to_cpu(im->seq);
3876 unsigned mseq = le32_to_cpu(im->migrate_seq);
3877 u64 realmino = le64_to_cpu(im->realm);
3878 u64 cap_id = le64_to_cpu(im->cap_id);
3883 p_cap_id = le64_to_cpu(ph->cap_id);
3884 peer = le32_to_cpu(ph->mds);
3890 dout("handle_cap_import inode %p ci %p mds%d mseq %d peer %d\n",
3891 inode, ci, mds, mseq, peer);
3893 cap = __get_cap_for_mds(ci, mds);
3896 spin_unlock(&ci->i_ceph_lock);
3897 new_cap = ceph_get_cap(mdsc, NULL);
3898 spin_lock(&ci->i_ceph_lock);
3904 ceph_put_cap(mdsc, new_cap);
3909 __ceph_caps_issued(ci, &issued);
3910 issued |= __ceph_caps_dirty(ci);
3912 ceph_add_cap(inode, session, cap_id, caps, wanted, seq, mseq,
3913 realmino, CEPH_CAP_FLAG_AUTH, &new_cap);
3915 ocap = peer >= 0 ? __get_cap_for_mds(ci, peer) : NULL;
3916 if (ocap && ocap->cap_id == p_cap_id) {
3917 dout(" remove export cap %p mds%d flags %d\n",
3918 ocap, peer, ph->flags);
3919 if ((ph->flags & CEPH_CAP_FLAG_AUTH) &&
3920 (ocap->seq != le32_to_cpu(ph->seq) ||
3921 ocap->mseq != le32_to_cpu(ph->mseq))) {
3922 pr_err_ratelimited("handle_cap_import: "
3923 "mismatched seq/mseq: ino (%llx.%llx) "
3924 "mds%d seq %d mseq %d importer mds%d "
3925 "has peer seq %d mseq %d\n",
3926 ceph_vinop(inode), peer, ocap->seq,
3927 ocap->mseq, mds, le32_to_cpu(ph->seq),
3928 le32_to_cpu(ph->mseq));
3930 __ceph_remove_cap(ocap, (ph->flags & CEPH_CAP_FLAG_RELEASE));
3933 *old_issued = issued;
3938 * Handle a caps message from the MDS.
3940 * Identify the appropriate session, inode, and call the right handler
3941 * based on the cap op.
3943 void ceph_handle_caps(struct ceph_mds_session *session,
3944 struct ceph_msg *msg)
3946 struct ceph_mds_client *mdsc = session->s_mdsc;
3947 struct inode *inode;
3948 struct ceph_inode_info *ci;
3949 struct ceph_cap *cap;
3950 struct ceph_mds_caps *h;
3951 struct ceph_mds_cap_peer *peer = NULL;
3952 struct ceph_snap_realm *realm = NULL;
3954 int msg_version = le16_to_cpu(msg->hdr.version);
3956 struct ceph_vino vino;
3958 size_t snaptrace_len;
3960 struct cap_extra_info extra_info = {};
3963 dout("handle_caps from mds%d\n", session->s_mds);
3966 end = msg->front.iov_base + msg->front.iov_len;
3967 if (msg->front.iov_len < sizeof(*h))
3969 h = msg->front.iov_base;
3970 op = le32_to_cpu(h->op);
3971 vino.ino = le64_to_cpu(h->ino);
3972 vino.snap = CEPH_NOSNAP;
3973 seq = le32_to_cpu(h->seq);
3974 mseq = le32_to_cpu(h->migrate_seq);
3977 snaptrace_len = le32_to_cpu(h->snap_trace_len);
3978 p = snaptrace + snaptrace_len;
3980 if (msg_version >= 2) {
3982 ceph_decode_32_safe(&p, end, flock_len, bad);
3983 if (p + flock_len > end)
3988 if (msg_version >= 3) {
3989 if (op == CEPH_CAP_OP_IMPORT) {
3990 if (p + sizeof(*peer) > end)
3994 } else if (op == CEPH_CAP_OP_EXPORT) {
3995 /* recorded in unused fields */
3996 peer = (void *)&h->size;
4000 if (msg_version >= 4) {
4001 ceph_decode_64_safe(&p, end, extra_info.inline_version, bad);
4002 ceph_decode_32_safe(&p, end, extra_info.inline_len, bad);
4003 if (p + extra_info.inline_len > end)
4005 extra_info.inline_data = p;
4006 p += extra_info.inline_len;
4009 if (msg_version >= 5) {
4010 struct ceph_osd_client *osdc = &mdsc->fsc->client->osdc;
4013 ceph_decode_32_safe(&p, end, epoch_barrier, bad);
4014 ceph_osdc_update_epoch_barrier(osdc, epoch_barrier);
4017 if (msg_version >= 8) {
4019 u32 caller_uid, caller_gid;
4023 ceph_decode_64_safe(&p, end, flush_tid, bad);
4025 ceph_decode_32_safe(&p, end, caller_uid, bad);
4026 ceph_decode_32_safe(&p, end, caller_gid, bad);
4028 ceph_decode_32_safe(&p, end, pool_ns_len, bad);
4029 if (pool_ns_len > 0) {
4030 ceph_decode_need(&p, end, pool_ns_len, bad);
4031 extra_info.pool_ns =
4032 ceph_find_or_create_string(p, pool_ns_len);
4037 if (msg_version >= 9) {
4038 struct ceph_timespec *btime;
4040 if (p + sizeof(*btime) > end)
4043 ceph_decode_timespec64(&extra_info.btime, btime);
4044 p += sizeof(*btime);
4045 ceph_decode_64_safe(&p, end, extra_info.change_attr, bad);
4048 if (msg_version >= 11) {
4051 ceph_decode_32_safe(&p, end, flags, bad);
4053 extra_info.dirstat_valid = true;
4054 ceph_decode_64_safe(&p, end, extra_info.nfiles, bad);
4055 ceph_decode_64_safe(&p, end, extra_info.nsubdirs, bad);
4059 inode = ceph_find_inode(mdsc->fsc->sb, vino);
4060 ci = ceph_inode(inode);
4061 dout(" op %s ino %llx.%llx inode %p\n", ceph_cap_op_name(op), vino.ino,
4064 mutex_lock(&session->s_mutex);
4066 dout(" mds%d seq %lld cap seq %u\n", session->s_mds, session->s_seq,
4070 dout(" i don't have ino %llx\n", vino.ino);
4072 if (op == CEPH_CAP_OP_IMPORT) {
4073 cap = ceph_get_cap(mdsc, NULL);
4074 cap->cap_ino = vino.ino;
4075 cap->queue_release = 1;
4076 cap->cap_id = le64_to_cpu(h->cap_id);
4079 cap->issue_seq = seq;
4080 spin_lock(&session->s_cap_lock);
4081 __ceph_queue_cap_release(session, cap);
4082 spin_unlock(&session->s_cap_lock);
4084 goto flush_cap_releases;
4087 /* these will work even if we don't have a cap yet */
4089 case CEPH_CAP_OP_FLUSHSNAP_ACK:
4090 handle_cap_flushsnap_ack(inode, le64_to_cpu(msg->hdr.tid),
4094 case CEPH_CAP_OP_EXPORT:
4095 handle_cap_export(inode, h, peer, session);
4098 case CEPH_CAP_OP_IMPORT:
4100 if (snaptrace_len) {
4101 down_write(&mdsc->snap_rwsem);
4102 ceph_update_snap_trace(mdsc, snaptrace,
4103 snaptrace + snaptrace_len,
4105 downgrade_write(&mdsc->snap_rwsem);
4107 down_read(&mdsc->snap_rwsem);
4109 spin_lock(&ci->i_ceph_lock);
4110 handle_cap_import(mdsc, inode, h, peer, session,
4111 &cap, &extra_info.issued);
4112 handle_cap_grant(inode, session, cap,
4113 h, msg->middle, &extra_info);
4115 ceph_put_snap_realm(mdsc, realm);
4119 /* the rest require a cap */
4120 spin_lock(&ci->i_ceph_lock);
4121 cap = __get_cap_for_mds(ceph_inode(inode), session->s_mds);
4123 dout(" no cap on %p ino %llx.%llx from mds%d\n",
4124 inode, ceph_ino(inode), ceph_snap(inode),
4126 spin_unlock(&ci->i_ceph_lock);
4127 goto flush_cap_releases;
4130 /* note that each of these drops i_ceph_lock for us */
4132 case CEPH_CAP_OP_REVOKE:
4133 case CEPH_CAP_OP_GRANT:
4134 __ceph_caps_issued(ci, &extra_info.issued);
4135 extra_info.issued |= __ceph_caps_dirty(ci);
4136 handle_cap_grant(inode, session, cap,
4137 h, msg->middle, &extra_info);
4140 case CEPH_CAP_OP_FLUSH_ACK:
4141 handle_cap_flush_ack(inode, le64_to_cpu(msg->hdr.tid),
4145 case CEPH_CAP_OP_TRUNC:
4146 queue_trunc = handle_cap_trunc(inode, h, session);
4147 spin_unlock(&ci->i_ceph_lock);
4149 ceph_queue_vmtruncate(inode);
4153 spin_unlock(&ci->i_ceph_lock);
4154 pr_err("ceph_handle_caps: unknown cap op %d %s\n", op,
4155 ceph_cap_op_name(op));
4159 mutex_unlock(&session->s_mutex);
4161 ceph_put_string(extra_info.pool_ns);
4162 /* avoid calling iput_final() in mds dispatch threads */
4163 ceph_async_iput(inode);
4168 * send any cap release message to try to move things
4169 * along for the mds (who clearly thinks we still have this
4172 ceph_flush_cap_releases(mdsc, session);
4176 pr_err("ceph_handle_caps: corrupt message\n");
4182 * Delayed work handler to process end of delayed cap release LRU list.
4184 void ceph_check_delayed_caps(struct ceph_mds_client *mdsc)
4186 struct inode *inode;
4187 struct ceph_inode_info *ci;
4189 dout("check_delayed_caps\n");
4191 spin_lock(&mdsc->cap_delay_lock);
4192 if (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);
4203 spin_unlock(&mdsc->cap_delay_lock);
4206 dout("check_delayed_caps on %p\n", inode);
4207 ceph_check_caps(ci, 0, NULL);
4208 /* avoid calling iput_final() in tick thread */
4209 ceph_async_iput(inode);
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);