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 gen = atomic_read(&session->s_cap_gen);
650 cap = __get_cap_for_mds(ci, mds);
656 cap->implemented = 0;
662 __insert_cap_node(ci, cap);
664 /* add to session cap list */
665 cap->session = session;
666 spin_lock(&session->s_cap_lock);
667 list_add_tail(&cap->session_caps, &session->s_caps);
668 session->s_nr_caps++;
669 atomic64_inc(&mdsc->metric.total_caps);
670 spin_unlock(&session->s_cap_lock);
672 spin_lock(&session->s_cap_lock);
673 list_move_tail(&cap->session_caps, &session->s_caps);
674 spin_unlock(&session->s_cap_lock);
676 if (cap->cap_gen < gen)
677 cap->issued = cap->implemented = CEPH_CAP_PIN;
680 * auth mds of the inode changed. we received the cap export
681 * message, but still haven't received the cap import message.
682 * handle_cap_export() updated the new auth MDS' cap.
684 * "ceph_seq_cmp(seq, cap->seq) <= 0" means we are processing
685 * a message that was send before the cap import message. So
688 if (ceph_seq_cmp(seq, cap->seq) <= 0) {
689 WARN_ON(cap != ci->i_auth_cap);
690 WARN_ON(cap->cap_id != cap_id);
693 issued |= cap->issued;
694 flags |= CEPH_CAP_FLAG_AUTH;
698 if (!ci->i_snap_realm ||
699 ((flags & CEPH_CAP_FLAG_AUTH) &&
700 realmino != (u64)-1 && ci->i_snap_realm->ino != realmino)) {
702 * add this inode to the appropriate snap realm
704 struct ceph_snap_realm *realm = ceph_lookup_snap_realm(mdsc,
707 ceph_change_snap_realm(inode, realm);
709 WARN(1, "%s: couldn't find snap realm 0x%llx (ino 0x%llx oldrealm 0x%llx)\n",
710 __func__, realmino, ci->i_vino.ino,
711 ci->i_snap_realm ? ci->i_snap_realm->ino : 0);
714 __check_cap_issue(ci, cap, issued);
717 * If we are issued caps we don't want, or the mds' wanted
718 * value appears to be off, queue a check so we'll release
719 * later and/or update the mds wanted value.
721 actual_wanted = __ceph_caps_wanted(ci);
722 if ((wanted & ~actual_wanted) ||
723 (issued & ~actual_wanted & CEPH_CAP_ANY_WR)) {
724 dout(" issued %s, mds wanted %s, actual %s, queueing\n",
725 ceph_cap_string(issued), ceph_cap_string(wanted),
726 ceph_cap_string(actual_wanted));
727 __cap_delay_requeue(mdsc, ci);
730 if (flags & CEPH_CAP_FLAG_AUTH) {
731 if (!ci->i_auth_cap ||
732 ceph_seq_cmp(ci->i_auth_cap->mseq, mseq) < 0) {
733 if (ci->i_auth_cap &&
734 ci->i_auth_cap->session != cap->session)
735 change_auth_cap_ses(ci, cap->session);
736 ci->i_auth_cap = cap;
737 cap->mds_wanted = wanted;
740 WARN_ON(ci->i_auth_cap == cap);
743 dout("add_cap inode %p (%llx.%llx) cap %p %s now %s seq %d mds%d\n",
744 inode, ceph_vinop(inode), cap, ceph_cap_string(issued),
745 ceph_cap_string(issued|cap->issued), seq, mds);
746 cap->cap_id = cap_id;
747 cap->issued = issued;
748 cap->implemented |= issued;
749 if (ceph_seq_cmp(mseq, cap->mseq) > 0)
750 cap->mds_wanted = wanted;
752 cap->mds_wanted |= wanted;
754 cap->issue_seq = seq;
760 * Return true if cap has not timed out and belongs to the current
761 * generation of the MDS session (i.e. has not gone 'stale' due to
762 * us losing touch with the mds).
764 static int __cap_is_valid(struct ceph_cap *cap)
769 gen = atomic_read(&cap->session->s_cap_gen);
770 ttl = cap->session->s_cap_ttl;
772 if (cap->cap_gen < gen || time_after_eq(jiffies, ttl)) {
773 dout("__cap_is_valid %p cap %p issued %s "
774 "but STALE (gen %u vs %u)\n", &cap->ci->vfs_inode,
775 cap, ceph_cap_string(cap->issued), cap->cap_gen, gen);
783 * Return set of valid cap bits issued to us. Note that caps time
784 * out, and may be invalidated in bulk if the client session times out
785 * and session->s_cap_gen is bumped.
787 int __ceph_caps_issued(struct ceph_inode_info *ci, int *implemented)
789 int have = ci->i_snap_caps;
790 struct ceph_cap *cap;
795 for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
796 cap = rb_entry(p, struct ceph_cap, ci_node);
797 if (!__cap_is_valid(cap))
799 dout("__ceph_caps_issued %p cap %p issued %s\n",
800 &ci->vfs_inode, cap, ceph_cap_string(cap->issued));
803 *implemented |= cap->implemented;
806 * exclude caps issued by non-auth MDS, but are been revoking
807 * by the auth MDS. The non-auth MDS should be revoking/exporting
808 * these caps, but the message is delayed.
810 if (ci->i_auth_cap) {
811 cap = ci->i_auth_cap;
812 have &= ~cap->implemented | cap->issued;
818 * Get cap bits issued by caps other than @ocap
820 int __ceph_caps_issued_other(struct ceph_inode_info *ci, struct ceph_cap *ocap)
822 int have = ci->i_snap_caps;
823 struct ceph_cap *cap;
826 for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
827 cap = rb_entry(p, struct ceph_cap, ci_node);
830 if (!__cap_is_valid(cap))
838 * Move a cap to the end of the LRU (oldest caps at list head, newest
841 static void __touch_cap(struct ceph_cap *cap)
843 struct ceph_mds_session *s = cap->session;
845 spin_lock(&s->s_cap_lock);
846 if (!s->s_cap_iterator) {
847 dout("__touch_cap %p cap %p mds%d\n", &cap->ci->vfs_inode, cap,
849 list_move_tail(&cap->session_caps, &s->s_caps);
851 dout("__touch_cap %p cap %p mds%d NOP, iterating over caps\n",
852 &cap->ci->vfs_inode, cap, s->s_mds);
854 spin_unlock(&s->s_cap_lock);
858 * Check if we hold the given mask. If so, move the cap(s) to the
859 * front of their respective LRUs. (This is the preferred way for
860 * callers to check for caps they want.)
862 int __ceph_caps_issued_mask(struct ceph_inode_info *ci, int mask, int touch)
864 struct ceph_cap *cap;
866 int have = ci->i_snap_caps;
868 if ((have & mask) == mask) {
869 dout("__ceph_caps_issued_mask ino 0x%llx snap issued %s"
870 " (mask %s)\n", ceph_ino(&ci->vfs_inode),
871 ceph_cap_string(have),
872 ceph_cap_string(mask));
876 for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
877 cap = rb_entry(p, struct ceph_cap, ci_node);
878 if (!__cap_is_valid(cap))
880 if ((cap->issued & mask) == mask) {
881 dout("__ceph_caps_issued_mask ino 0x%llx cap %p issued %s"
882 " (mask %s)\n", ceph_ino(&ci->vfs_inode), cap,
883 ceph_cap_string(cap->issued),
884 ceph_cap_string(mask));
890 /* does a combination of caps satisfy mask? */
892 if ((have & mask) == mask) {
893 dout("__ceph_caps_issued_mask ino 0x%llx combo issued %s"
894 " (mask %s)\n", ceph_ino(&ci->vfs_inode),
895 ceph_cap_string(cap->issued),
896 ceph_cap_string(mask));
900 /* touch this + preceding caps */
902 for (q = rb_first(&ci->i_caps); q != p;
904 cap = rb_entry(q, struct ceph_cap,
906 if (!__cap_is_valid(cap))
908 if (cap->issued & mask)
919 int __ceph_caps_issued_mask_metric(struct ceph_inode_info *ci, int mask,
922 struct ceph_fs_client *fsc = ceph_sb_to_client(ci->vfs_inode.i_sb);
925 r = __ceph_caps_issued_mask(ci, mask, touch);
927 ceph_update_cap_hit(&fsc->mdsc->metric);
929 ceph_update_cap_mis(&fsc->mdsc->metric);
934 * Return true if mask caps are currently being revoked by an MDS.
936 int __ceph_caps_revoking_other(struct ceph_inode_info *ci,
937 struct ceph_cap *ocap, int mask)
939 struct ceph_cap *cap;
942 for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
943 cap = rb_entry(p, struct ceph_cap, ci_node);
945 (cap->implemented & ~cap->issued & mask))
951 int ceph_caps_revoking(struct ceph_inode_info *ci, int mask)
953 struct inode *inode = &ci->vfs_inode;
956 spin_lock(&ci->i_ceph_lock);
957 ret = __ceph_caps_revoking_other(ci, NULL, mask);
958 spin_unlock(&ci->i_ceph_lock);
959 dout("ceph_caps_revoking %p %s = %d\n", inode,
960 ceph_cap_string(mask), ret);
964 int __ceph_caps_used(struct ceph_inode_info *ci)
968 used |= CEPH_CAP_PIN;
970 used |= CEPH_CAP_FILE_RD;
971 if (ci->i_rdcache_ref ||
972 (S_ISREG(ci->vfs_inode.i_mode) &&
973 ci->vfs_inode.i_data.nrpages))
974 used |= CEPH_CAP_FILE_CACHE;
976 used |= CEPH_CAP_FILE_WR;
977 if (ci->i_wb_ref || ci->i_wrbuffer_ref)
978 used |= CEPH_CAP_FILE_BUFFER;
980 used |= CEPH_CAP_FILE_EXCL;
984 #define FMODE_WAIT_BIAS 1000
987 * wanted, by virtue of open file modes
989 int __ceph_caps_file_wanted(struct ceph_inode_info *ci)
991 const int PIN_SHIFT = ffs(CEPH_FILE_MODE_PIN);
992 const int RD_SHIFT = ffs(CEPH_FILE_MODE_RD);
993 const int WR_SHIFT = ffs(CEPH_FILE_MODE_WR);
994 const int LAZY_SHIFT = ffs(CEPH_FILE_MODE_LAZY);
995 struct ceph_mount_options *opt =
996 ceph_inode_to_client(&ci->vfs_inode)->mount_options;
997 unsigned long used_cutoff = jiffies - opt->caps_wanted_delay_max * HZ;
998 unsigned long idle_cutoff = jiffies - opt->caps_wanted_delay_min * HZ;
1000 if (S_ISDIR(ci->vfs_inode.i_mode)) {
1003 /* use used_cutoff here, to keep dir's wanted caps longer */
1004 if (ci->i_nr_by_mode[RD_SHIFT] > 0 ||
1005 time_after(ci->i_last_rd, used_cutoff))
1006 want |= CEPH_CAP_ANY_SHARED;
1008 if (ci->i_nr_by_mode[WR_SHIFT] > 0 ||
1009 time_after(ci->i_last_wr, used_cutoff)) {
1010 want |= CEPH_CAP_ANY_SHARED | CEPH_CAP_FILE_EXCL;
1011 if (opt->flags & CEPH_MOUNT_OPT_ASYNC_DIROPS)
1012 want |= CEPH_CAP_ANY_DIR_OPS;
1015 if (want || ci->i_nr_by_mode[PIN_SHIFT] > 0)
1016 want |= CEPH_CAP_PIN;
1022 if (ci->i_nr_by_mode[RD_SHIFT] > 0) {
1023 if (ci->i_nr_by_mode[RD_SHIFT] >= FMODE_WAIT_BIAS ||
1024 time_after(ci->i_last_rd, used_cutoff))
1025 bits |= 1 << RD_SHIFT;
1026 } else if (time_after(ci->i_last_rd, idle_cutoff)) {
1027 bits |= 1 << RD_SHIFT;
1030 if (ci->i_nr_by_mode[WR_SHIFT] > 0) {
1031 if (ci->i_nr_by_mode[WR_SHIFT] >= FMODE_WAIT_BIAS ||
1032 time_after(ci->i_last_wr, used_cutoff))
1033 bits |= 1 << WR_SHIFT;
1034 } else if (time_after(ci->i_last_wr, idle_cutoff)) {
1035 bits |= 1 << WR_SHIFT;
1038 /* check lazyio only when read/write is wanted */
1039 if ((bits & (CEPH_FILE_MODE_RDWR << 1)) &&
1040 ci->i_nr_by_mode[LAZY_SHIFT] > 0)
1041 bits |= 1 << LAZY_SHIFT;
1043 return bits ? ceph_caps_for_mode(bits >> 1) : 0;
1048 * wanted, by virtue of open file modes AND cap refs (buffered/cached data)
1050 int __ceph_caps_wanted(struct ceph_inode_info *ci)
1052 int w = __ceph_caps_file_wanted(ci) | __ceph_caps_used(ci);
1053 if (S_ISDIR(ci->vfs_inode.i_mode)) {
1054 /* we want EXCL if holding caps of dir ops */
1055 if (w & CEPH_CAP_ANY_DIR_OPS)
1056 w |= CEPH_CAP_FILE_EXCL;
1058 /* we want EXCL if dirty data */
1059 if (w & CEPH_CAP_FILE_BUFFER)
1060 w |= CEPH_CAP_FILE_EXCL;
1066 * Return caps we have registered with the MDS(s) as 'wanted'.
1068 int __ceph_caps_mds_wanted(struct ceph_inode_info *ci, bool check)
1070 struct ceph_cap *cap;
1074 for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
1075 cap = rb_entry(p, struct ceph_cap, ci_node);
1076 if (check && !__cap_is_valid(cap))
1078 if (cap == ci->i_auth_cap)
1079 mds_wanted |= cap->mds_wanted;
1081 mds_wanted |= (cap->mds_wanted & ~CEPH_CAP_ANY_FILE_WR);
1086 int ceph_is_any_caps(struct inode *inode)
1088 struct ceph_inode_info *ci = ceph_inode(inode);
1091 spin_lock(&ci->i_ceph_lock);
1092 ret = __ceph_is_any_real_caps(ci);
1093 spin_unlock(&ci->i_ceph_lock);
1099 * Remove a cap. Take steps to deal with a racing iterate_session_caps.
1101 * caller should hold i_ceph_lock.
1102 * caller will not hold session s_mutex if called from destroy_inode.
1104 void __ceph_remove_cap(struct ceph_cap *cap, bool queue_release)
1106 struct ceph_mds_session *session = cap->session;
1107 struct ceph_inode_info *ci = cap->ci;
1108 struct ceph_mds_client *mdsc;
1111 /* 'ci' being NULL means the remove have already occurred */
1113 dout("%s: cap inode is NULL\n", __func__);
1117 lockdep_assert_held(&ci->i_ceph_lock);
1119 dout("__ceph_remove_cap %p from %p\n", cap, &ci->vfs_inode);
1121 mdsc = ceph_inode_to_client(&ci->vfs_inode)->mdsc;
1123 /* remove from inode's cap rbtree, and clear auth cap */
1124 rb_erase(&cap->ci_node, &ci->i_caps);
1125 if (ci->i_auth_cap == cap)
1126 ci->i_auth_cap = NULL;
1128 /* remove from session list */
1129 spin_lock(&session->s_cap_lock);
1130 if (session->s_cap_iterator == cap) {
1131 /* not yet, we are iterating over this very cap */
1132 dout("__ceph_remove_cap delaying %p removal from session %p\n",
1135 list_del_init(&cap->session_caps);
1136 session->s_nr_caps--;
1137 atomic64_dec(&mdsc->metric.total_caps);
1138 cap->session = NULL;
1141 /* protect backpointer with s_cap_lock: see iterate_session_caps */
1145 * s_cap_reconnect is protected by s_cap_lock. no one changes
1146 * s_cap_gen while session is in the reconnect state.
1148 if (queue_release &&
1149 (!session->s_cap_reconnect ||
1150 cap->cap_gen == atomic_read(&session->s_cap_gen))) {
1151 cap->queue_release = 1;
1153 __ceph_queue_cap_release(session, cap);
1157 cap->queue_release = 0;
1159 cap->cap_ino = ci->i_vino.ino;
1161 spin_unlock(&session->s_cap_lock);
1164 ceph_put_cap(mdsc, cap);
1166 if (!__ceph_is_any_real_caps(ci)) {
1167 /* when reconnect denied, we remove session caps forcibly,
1168 * i_wr_ref can be non-zero. If there are ongoing write,
1169 * keep i_snap_realm.
1171 if (ci->i_wr_ref == 0 && ci->i_snap_realm)
1172 ceph_change_snap_realm(&ci->vfs_inode, NULL);
1174 __cap_delay_cancel(mdsc, ci);
1178 void ceph_remove_cap(struct ceph_cap *cap, bool queue_release)
1180 struct ceph_inode_info *ci = cap->ci;
1181 struct ceph_fs_client *fsc;
1183 /* 'ci' being NULL means the remove have already occurred */
1185 dout("%s: cap inode is NULL\n", __func__);
1189 lockdep_assert_held(&ci->i_ceph_lock);
1191 fsc = ceph_sb_to_client(ci->vfs_inode.i_sb);
1192 WARN_ON_ONCE(ci->i_auth_cap == cap &&
1193 !list_empty(&ci->i_dirty_item) &&
1194 !fsc->blocklisted &&
1195 READ_ONCE(fsc->mount_state) != CEPH_MOUNT_SHUTDOWN);
1197 __ceph_remove_cap(cap, queue_release);
1200 struct cap_msg_args {
1201 struct ceph_mds_session *session;
1202 u64 ino, cid, follows;
1203 u64 flush_tid, oldest_flush_tid, size, max_size;
1206 struct ceph_buffer *xattr_buf;
1207 struct ceph_buffer *old_xattr_buf;
1208 struct timespec64 atime, mtime, ctime, btime;
1209 int op, caps, wanted, dirty;
1210 u32 seq, issue_seq, mseq, time_warp_seq;
1220 * cap struct size + flock buffer size + inline version + inline data size +
1221 * osd_epoch_barrier + oldest_flush_tid
1223 #define CAP_MSG_SIZE (sizeof(struct ceph_mds_caps) + \
1224 4 + 8 + 4 + 4 + 8 + 4 + 4 + 4 + 8 + 8 + 4)
1226 /* Marshal up the cap msg to the MDS */
1227 static void encode_cap_msg(struct ceph_msg *msg, struct cap_msg_args *arg)
1229 struct ceph_mds_caps *fc;
1231 struct ceph_osd_client *osdc = &arg->session->s_mdsc->fsc->client->osdc;
1233 dout("%s %s %llx %llx caps %s wanted %s dirty %s seq %u/%u tid %llu/%llu mseq %u follows %lld size %llu/%llu xattr_ver %llu xattr_len %d\n",
1234 __func__, ceph_cap_op_name(arg->op), arg->cid, arg->ino,
1235 ceph_cap_string(arg->caps), ceph_cap_string(arg->wanted),
1236 ceph_cap_string(arg->dirty), arg->seq, arg->issue_seq,
1237 arg->flush_tid, arg->oldest_flush_tid, arg->mseq, arg->follows,
1238 arg->size, arg->max_size, arg->xattr_version,
1239 arg->xattr_buf ? (int)arg->xattr_buf->vec.iov_len : 0);
1241 msg->hdr.version = cpu_to_le16(10);
1242 msg->hdr.tid = cpu_to_le64(arg->flush_tid);
1244 fc = msg->front.iov_base;
1245 memset(fc, 0, sizeof(*fc));
1247 fc->cap_id = cpu_to_le64(arg->cid);
1248 fc->op = cpu_to_le32(arg->op);
1249 fc->seq = cpu_to_le32(arg->seq);
1250 fc->issue_seq = cpu_to_le32(arg->issue_seq);
1251 fc->migrate_seq = cpu_to_le32(arg->mseq);
1252 fc->caps = cpu_to_le32(arg->caps);
1253 fc->wanted = cpu_to_le32(arg->wanted);
1254 fc->dirty = cpu_to_le32(arg->dirty);
1255 fc->ino = cpu_to_le64(arg->ino);
1256 fc->snap_follows = cpu_to_le64(arg->follows);
1258 fc->size = cpu_to_le64(arg->size);
1259 fc->max_size = cpu_to_le64(arg->max_size);
1260 ceph_encode_timespec64(&fc->mtime, &arg->mtime);
1261 ceph_encode_timespec64(&fc->atime, &arg->atime);
1262 ceph_encode_timespec64(&fc->ctime, &arg->ctime);
1263 fc->time_warp_seq = cpu_to_le32(arg->time_warp_seq);
1265 fc->uid = cpu_to_le32(from_kuid(&init_user_ns, arg->uid));
1266 fc->gid = cpu_to_le32(from_kgid(&init_user_ns, arg->gid));
1267 fc->mode = cpu_to_le32(arg->mode);
1269 fc->xattr_version = cpu_to_le64(arg->xattr_version);
1270 if (arg->xattr_buf) {
1271 msg->middle = ceph_buffer_get(arg->xattr_buf);
1272 fc->xattr_len = cpu_to_le32(arg->xattr_buf->vec.iov_len);
1273 msg->hdr.middle_len = cpu_to_le32(arg->xattr_buf->vec.iov_len);
1277 /* flock buffer size (version 2) */
1278 ceph_encode_32(&p, 0);
1279 /* inline version (version 4) */
1280 ceph_encode_64(&p, arg->inline_data ? 0 : CEPH_INLINE_NONE);
1281 /* inline data size */
1282 ceph_encode_32(&p, 0);
1284 * osd_epoch_barrier (version 5)
1285 * The epoch_barrier is protected osdc->lock, so READ_ONCE here in
1286 * case it was recently changed
1288 ceph_encode_32(&p, READ_ONCE(osdc->epoch_barrier));
1289 /* oldest_flush_tid (version 6) */
1290 ceph_encode_64(&p, arg->oldest_flush_tid);
1293 * caller_uid/caller_gid (version 7)
1295 * Currently, we don't properly track which caller dirtied the caps
1296 * last, and force a flush of them when there is a conflict. For now,
1297 * just set this to 0:0, to emulate how the MDS has worked up to now.
1299 ceph_encode_32(&p, 0);
1300 ceph_encode_32(&p, 0);
1302 /* pool namespace (version 8) (mds always ignores this) */
1303 ceph_encode_32(&p, 0);
1305 /* btime and change_attr (version 9) */
1306 ceph_encode_timespec64(p, &arg->btime);
1307 p += sizeof(struct ceph_timespec);
1308 ceph_encode_64(&p, arg->change_attr);
1310 /* Advisory flags (version 10) */
1311 ceph_encode_32(&p, arg->flags);
1315 * Queue cap releases when an inode is dropped from our cache.
1317 void __ceph_remove_caps(struct ceph_inode_info *ci)
1321 /* lock i_ceph_lock, because ceph_d_revalidate(..., LOOKUP_RCU)
1322 * may call __ceph_caps_issued_mask() on a freeing inode. */
1323 spin_lock(&ci->i_ceph_lock);
1324 p = rb_first(&ci->i_caps);
1326 struct ceph_cap *cap = rb_entry(p, struct ceph_cap, ci_node);
1328 ceph_remove_cap(cap, true);
1330 spin_unlock(&ci->i_ceph_lock);
1334 * Prepare to send a cap message to an MDS. Update the cap state, and populate
1335 * the arg struct with the parameters that will need to be sent. This should
1336 * be done under the i_ceph_lock to guard against changes to cap state.
1338 * Make note of max_size reported/requested from mds, revoked caps
1339 * that have now been implemented.
1341 static void __prep_cap(struct cap_msg_args *arg, struct ceph_cap *cap,
1342 int op, int flags, int used, int want, int retain,
1343 int flushing, u64 flush_tid, u64 oldest_flush_tid)
1345 struct ceph_inode_info *ci = cap->ci;
1346 struct inode *inode = &ci->vfs_inode;
1349 lockdep_assert_held(&ci->i_ceph_lock);
1351 held = cap->issued | cap->implemented;
1352 revoking = cap->implemented & ~cap->issued;
1353 retain &= ~revoking;
1355 dout("%s %p cap %p session %p %s -> %s (revoking %s)\n",
1356 __func__, inode, cap, cap->session,
1357 ceph_cap_string(held), ceph_cap_string(held & retain),
1358 ceph_cap_string(revoking));
1359 BUG_ON((retain & CEPH_CAP_PIN) == 0);
1361 ci->i_ceph_flags &= ~CEPH_I_FLUSH;
1363 cap->issued &= retain; /* drop bits we don't want */
1365 * Wake up any waiters on wanted -> needed transition. This is due to
1366 * the weird transition from buffered to sync IO... we need to flush
1367 * dirty pages _before_ allowing sync writes to avoid reordering.
1369 arg->wake = cap->implemented & ~cap->issued;
1370 cap->implemented &= cap->issued | used;
1371 cap->mds_wanted = want;
1373 arg->session = cap->session;
1374 arg->ino = ceph_vino(inode).ino;
1375 arg->cid = cap->cap_id;
1376 arg->follows = flushing ? ci->i_head_snapc->seq : 0;
1377 arg->flush_tid = flush_tid;
1378 arg->oldest_flush_tid = oldest_flush_tid;
1380 arg->size = i_size_read(inode);
1381 ci->i_reported_size = arg->size;
1382 arg->max_size = ci->i_wanted_max_size;
1383 if (cap == ci->i_auth_cap) {
1384 if (want & CEPH_CAP_ANY_FILE_WR)
1385 ci->i_requested_max_size = arg->max_size;
1387 ci->i_requested_max_size = 0;
1390 if (flushing & CEPH_CAP_XATTR_EXCL) {
1391 arg->old_xattr_buf = __ceph_build_xattrs_blob(ci);
1392 arg->xattr_version = ci->i_xattrs.version;
1393 arg->xattr_buf = ci->i_xattrs.blob;
1395 arg->xattr_buf = NULL;
1396 arg->old_xattr_buf = NULL;
1399 arg->mtime = inode->i_mtime;
1400 arg->atime = inode->i_atime;
1401 arg->ctime = inode->i_ctime;
1402 arg->btime = ci->i_btime;
1403 arg->change_attr = inode_peek_iversion_raw(inode);
1406 arg->caps = cap->implemented;
1408 arg->dirty = flushing;
1410 arg->seq = cap->seq;
1411 arg->issue_seq = cap->issue_seq;
1412 arg->mseq = cap->mseq;
1413 arg->time_warp_seq = ci->i_time_warp_seq;
1415 arg->uid = inode->i_uid;
1416 arg->gid = inode->i_gid;
1417 arg->mode = inode->i_mode;
1419 arg->inline_data = ci->i_inline_version != CEPH_INLINE_NONE;
1420 if (!(flags & CEPH_CLIENT_CAPS_PENDING_CAPSNAP) &&
1421 !list_empty(&ci->i_cap_snaps)) {
1422 struct ceph_cap_snap *capsnap;
1423 list_for_each_entry_reverse(capsnap, &ci->i_cap_snaps, ci_item) {
1424 if (capsnap->cap_flush.tid)
1426 if (capsnap->need_flush) {
1427 flags |= CEPH_CLIENT_CAPS_PENDING_CAPSNAP;
1436 * Send a cap msg on the given inode.
1438 * Caller should hold snap_rwsem (read), s_mutex.
1440 static void __send_cap(struct cap_msg_args *arg, struct ceph_inode_info *ci)
1442 struct ceph_msg *msg;
1443 struct inode *inode = &ci->vfs_inode;
1445 msg = ceph_msg_new(CEPH_MSG_CLIENT_CAPS, CAP_MSG_SIZE, GFP_NOFS, false);
1447 pr_err("error allocating cap msg: ino (%llx.%llx) flushing %s tid %llu, requeuing cap.\n",
1448 ceph_vinop(inode), ceph_cap_string(arg->dirty),
1450 spin_lock(&ci->i_ceph_lock);
1451 __cap_delay_requeue(arg->session->s_mdsc, ci);
1452 spin_unlock(&ci->i_ceph_lock);
1456 encode_cap_msg(msg, arg);
1457 ceph_con_send(&arg->session->s_con, msg);
1458 ceph_buffer_put(arg->old_xattr_buf);
1460 wake_up_all(&ci->i_cap_wq);
1463 static inline int __send_flush_snap(struct inode *inode,
1464 struct ceph_mds_session *session,
1465 struct ceph_cap_snap *capsnap,
1466 u32 mseq, u64 oldest_flush_tid)
1468 struct cap_msg_args arg;
1469 struct ceph_msg *msg;
1471 msg = ceph_msg_new(CEPH_MSG_CLIENT_CAPS, CAP_MSG_SIZE, GFP_NOFS, false);
1475 arg.session = session;
1476 arg.ino = ceph_vino(inode).ino;
1478 arg.follows = capsnap->follows;
1479 arg.flush_tid = capsnap->cap_flush.tid;
1480 arg.oldest_flush_tid = oldest_flush_tid;
1482 arg.size = capsnap->size;
1484 arg.xattr_version = capsnap->xattr_version;
1485 arg.xattr_buf = capsnap->xattr_blob;
1486 arg.old_xattr_buf = NULL;
1488 arg.atime = capsnap->atime;
1489 arg.mtime = capsnap->mtime;
1490 arg.ctime = capsnap->ctime;
1491 arg.btime = capsnap->btime;
1492 arg.change_attr = capsnap->change_attr;
1494 arg.op = CEPH_CAP_OP_FLUSHSNAP;
1495 arg.caps = capsnap->issued;
1497 arg.dirty = capsnap->dirty;
1502 arg.time_warp_seq = capsnap->time_warp_seq;
1504 arg.uid = capsnap->uid;
1505 arg.gid = capsnap->gid;
1506 arg.mode = capsnap->mode;
1508 arg.inline_data = capsnap->inline_data;
1512 encode_cap_msg(msg, &arg);
1513 ceph_con_send(&arg.session->s_con, msg);
1518 * When a snapshot is taken, clients accumulate dirty metadata on
1519 * inodes with capabilities in ceph_cap_snaps to describe the file
1520 * state at the time the snapshot was taken. This must be flushed
1521 * asynchronously back to the MDS once sync writes complete and dirty
1522 * data is written out.
1524 * Called under i_ceph_lock.
1526 static void __ceph_flush_snaps(struct ceph_inode_info *ci,
1527 struct ceph_mds_session *session)
1528 __releases(ci->i_ceph_lock)
1529 __acquires(ci->i_ceph_lock)
1531 struct inode *inode = &ci->vfs_inode;
1532 struct ceph_mds_client *mdsc = session->s_mdsc;
1533 struct ceph_cap_snap *capsnap;
1534 u64 oldest_flush_tid = 0;
1535 u64 first_tid = 1, last_tid = 0;
1537 dout("__flush_snaps %p session %p\n", inode, session);
1539 list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) {
1541 * we need to wait for sync writes to complete and for dirty
1542 * pages to be written out.
1544 if (capsnap->dirty_pages || capsnap->writing)
1547 /* should be removed by ceph_try_drop_cap_snap() */
1548 BUG_ON(!capsnap->need_flush);
1550 /* only flush each capsnap once */
1551 if (capsnap->cap_flush.tid > 0) {
1552 dout(" already flushed %p, skipping\n", capsnap);
1556 spin_lock(&mdsc->cap_dirty_lock);
1557 capsnap->cap_flush.tid = ++mdsc->last_cap_flush_tid;
1558 list_add_tail(&capsnap->cap_flush.g_list,
1559 &mdsc->cap_flush_list);
1560 if (oldest_flush_tid == 0)
1561 oldest_flush_tid = __get_oldest_flush_tid(mdsc);
1562 if (list_empty(&ci->i_flushing_item)) {
1563 list_add_tail(&ci->i_flushing_item,
1564 &session->s_cap_flushing);
1566 spin_unlock(&mdsc->cap_dirty_lock);
1568 list_add_tail(&capsnap->cap_flush.i_list,
1569 &ci->i_cap_flush_list);
1572 first_tid = capsnap->cap_flush.tid;
1573 last_tid = capsnap->cap_flush.tid;
1576 ci->i_ceph_flags &= ~CEPH_I_FLUSH_SNAPS;
1578 while (first_tid <= last_tid) {
1579 struct ceph_cap *cap = ci->i_auth_cap;
1580 struct ceph_cap_flush *cf;
1583 if (!(cap && cap->session == session)) {
1584 dout("__flush_snaps %p auth cap %p not mds%d, "
1585 "stop\n", inode, cap, session->s_mds);
1590 list_for_each_entry(cf, &ci->i_cap_flush_list, i_list) {
1591 if (cf->tid >= first_tid) {
1599 first_tid = cf->tid + 1;
1601 capsnap = container_of(cf, struct ceph_cap_snap, cap_flush);
1602 refcount_inc(&capsnap->nref);
1603 spin_unlock(&ci->i_ceph_lock);
1605 dout("__flush_snaps %p capsnap %p tid %llu %s\n",
1606 inode, capsnap, cf->tid, ceph_cap_string(capsnap->dirty));
1608 ret = __send_flush_snap(inode, session, capsnap, cap->mseq,
1611 pr_err("__flush_snaps: error sending cap flushsnap, "
1612 "ino (%llx.%llx) tid %llu follows %llu\n",
1613 ceph_vinop(inode), cf->tid, capsnap->follows);
1616 ceph_put_cap_snap(capsnap);
1617 spin_lock(&ci->i_ceph_lock);
1621 void ceph_flush_snaps(struct ceph_inode_info *ci,
1622 struct ceph_mds_session **psession)
1624 struct inode *inode = &ci->vfs_inode;
1625 struct ceph_mds_client *mdsc = ceph_inode_to_client(inode)->mdsc;
1626 struct ceph_mds_session *session = NULL;
1629 dout("ceph_flush_snaps %p\n", inode);
1631 session = *psession;
1633 spin_lock(&ci->i_ceph_lock);
1634 if (!(ci->i_ceph_flags & CEPH_I_FLUSH_SNAPS)) {
1635 dout(" no capsnap needs flush, doing nothing\n");
1638 if (!ci->i_auth_cap) {
1639 dout(" no auth cap (migrating?), doing nothing\n");
1643 mds = ci->i_auth_cap->session->s_mds;
1644 if (session && session->s_mds != mds) {
1645 dout(" oops, wrong session %p mutex\n", session);
1646 ceph_put_mds_session(session);
1650 spin_unlock(&ci->i_ceph_lock);
1651 mutex_lock(&mdsc->mutex);
1652 session = __ceph_lookup_mds_session(mdsc, mds);
1653 mutex_unlock(&mdsc->mutex);
1657 // make sure flushsnap messages are sent in proper order.
1658 if (ci->i_ceph_flags & CEPH_I_KICK_FLUSH)
1659 __kick_flushing_caps(mdsc, session, ci, 0);
1661 __ceph_flush_snaps(ci, session);
1663 spin_unlock(&ci->i_ceph_lock);
1666 *psession = session;
1668 ceph_put_mds_session(session);
1669 /* we flushed them all; remove this inode from the queue */
1670 spin_lock(&mdsc->snap_flush_lock);
1671 list_del_init(&ci->i_snap_flush_item);
1672 spin_unlock(&mdsc->snap_flush_lock);
1676 * Mark caps dirty. If inode is newly dirty, return the dirty flags.
1677 * Caller is then responsible for calling __mark_inode_dirty with the
1678 * returned flags value.
1680 int __ceph_mark_dirty_caps(struct ceph_inode_info *ci, int mask,
1681 struct ceph_cap_flush **pcf)
1683 struct ceph_mds_client *mdsc =
1684 ceph_sb_to_client(ci->vfs_inode.i_sb)->mdsc;
1685 struct inode *inode = &ci->vfs_inode;
1686 int was = ci->i_dirty_caps;
1689 lockdep_assert_held(&ci->i_ceph_lock);
1691 if (!ci->i_auth_cap) {
1692 pr_warn("__mark_dirty_caps %p %llx mask %s, "
1693 "but no auth cap (session was closed?)\n",
1694 inode, ceph_ino(inode), ceph_cap_string(mask));
1698 dout("__mark_dirty_caps %p %s dirty %s -> %s\n", &ci->vfs_inode,
1699 ceph_cap_string(mask), ceph_cap_string(was),
1700 ceph_cap_string(was | mask));
1701 ci->i_dirty_caps |= mask;
1703 struct ceph_mds_session *session = ci->i_auth_cap->session;
1705 WARN_ON_ONCE(ci->i_prealloc_cap_flush);
1706 swap(ci->i_prealloc_cap_flush, *pcf);
1708 if (!ci->i_head_snapc) {
1709 WARN_ON_ONCE(!rwsem_is_locked(&mdsc->snap_rwsem));
1710 ci->i_head_snapc = ceph_get_snap_context(
1711 ci->i_snap_realm->cached_context);
1713 dout(" inode %p now dirty snapc %p auth cap %p\n",
1714 &ci->vfs_inode, ci->i_head_snapc, ci->i_auth_cap);
1715 BUG_ON(!list_empty(&ci->i_dirty_item));
1716 spin_lock(&mdsc->cap_dirty_lock);
1717 list_add(&ci->i_dirty_item, &session->s_cap_dirty);
1718 spin_unlock(&mdsc->cap_dirty_lock);
1719 if (ci->i_flushing_caps == 0) {
1721 dirty |= I_DIRTY_SYNC;
1724 WARN_ON_ONCE(!ci->i_prealloc_cap_flush);
1726 BUG_ON(list_empty(&ci->i_dirty_item));
1727 if (((was | ci->i_flushing_caps) & CEPH_CAP_FILE_BUFFER) &&
1728 (mask & CEPH_CAP_FILE_BUFFER))
1729 dirty |= I_DIRTY_DATASYNC;
1730 __cap_delay_requeue(mdsc, ci);
1734 struct ceph_cap_flush *ceph_alloc_cap_flush(void)
1736 struct ceph_cap_flush *cf;
1738 cf = kmem_cache_alloc(ceph_cap_flush_cachep, GFP_KERNEL);
1742 cf->is_capsnap = false;
1746 void ceph_free_cap_flush(struct ceph_cap_flush *cf)
1749 kmem_cache_free(ceph_cap_flush_cachep, cf);
1752 static u64 __get_oldest_flush_tid(struct ceph_mds_client *mdsc)
1754 if (!list_empty(&mdsc->cap_flush_list)) {
1755 struct ceph_cap_flush *cf =
1756 list_first_entry(&mdsc->cap_flush_list,
1757 struct ceph_cap_flush, g_list);
1764 * Remove cap_flush from the mdsc's or inode's flushing cap list.
1765 * Return true if caller needs to wake up flush waiters.
1767 static bool __detach_cap_flush_from_mdsc(struct ceph_mds_client *mdsc,
1768 struct ceph_cap_flush *cf)
1770 struct ceph_cap_flush *prev;
1771 bool wake = cf->wake;
1773 if (wake && cf->g_list.prev != &mdsc->cap_flush_list) {
1774 prev = list_prev_entry(cf, g_list);
1778 list_del_init(&cf->g_list);
1782 static bool __detach_cap_flush_from_ci(struct ceph_inode_info *ci,
1783 struct ceph_cap_flush *cf)
1785 struct ceph_cap_flush *prev;
1786 bool wake = cf->wake;
1788 if (wake && cf->i_list.prev != &ci->i_cap_flush_list) {
1789 prev = list_prev_entry(cf, i_list);
1793 list_del_init(&cf->i_list);
1798 * Add dirty inode to the flushing list. Assigned a seq number so we
1799 * can wait for caps to flush without starving.
1801 * Called under i_ceph_lock. Returns the flush tid.
1803 static u64 __mark_caps_flushing(struct inode *inode,
1804 struct ceph_mds_session *session, bool wake,
1805 u64 *oldest_flush_tid)
1807 struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
1808 struct ceph_inode_info *ci = ceph_inode(inode);
1809 struct ceph_cap_flush *cf = NULL;
1812 lockdep_assert_held(&ci->i_ceph_lock);
1813 BUG_ON(ci->i_dirty_caps == 0);
1814 BUG_ON(list_empty(&ci->i_dirty_item));
1815 BUG_ON(!ci->i_prealloc_cap_flush);
1817 flushing = ci->i_dirty_caps;
1818 dout("__mark_caps_flushing flushing %s, flushing_caps %s -> %s\n",
1819 ceph_cap_string(flushing),
1820 ceph_cap_string(ci->i_flushing_caps),
1821 ceph_cap_string(ci->i_flushing_caps | flushing));
1822 ci->i_flushing_caps |= flushing;
1823 ci->i_dirty_caps = 0;
1824 dout(" inode %p now !dirty\n", inode);
1826 swap(cf, ci->i_prealloc_cap_flush);
1827 cf->caps = flushing;
1830 spin_lock(&mdsc->cap_dirty_lock);
1831 list_del_init(&ci->i_dirty_item);
1833 cf->tid = ++mdsc->last_cap_flush_tid;
1834 list_add_tail(&cf->g_list, &mdsc->cap_flush_list);
1835 *oldest_flush_tid = __get_oldest_flush_tid(mdsc);
1837 if (list_empty(&ci->i_flushing_item)) {
1838 list_add_tail(&ci->i_flushing_item, &session->s_cap_flushing);
1839 mdsc->num_cap_flushing++;
1841 spin_unlock(&mdsc->cap_dirty_lock);
1843 list_add_tail(&cf->i_list, &ci->i_cap_flush_list);
1849 * try to invalidate mapping pages without blocking.
1851 static int try_nonblocking_invalidate(struct inode *inode)
1852 __releases(ci->i_ceph_lock)
1853 __acquires(ci->i_ceph_lock)
1855 struct ceph_inode_info *ci = ceph_inode(inode);
1856 u32 invalidating_gen = ci->i_rdcache_gen;
1858 spin_unlock(&ci->i_ceph_lock);
1859 ceph_fscache_invalidate(inode);
1860 invalidate_mapping_pages(&inode->i_data, 0, -1);
1861 spin_lock(&ci->i_ceph_lock);
1863 if (inode->i_data.nrpages == 0 &&
1864 invalidating_gen == ci->i_rdcache_gen) {
1866 dout("try_nonblocking_invalidate %p success\n", inode);
1867 /* save any racing async invalidate some trouble */
1868 ci->i_rdcache_revoking = ci->i_rdcache_gen - 1;
1871 dout("try_nonblocking_invalidate %p failed\n", inode);
1875 bool __ceph_should_report_size(struct ceph_inode_info *ci)
1877 loff_t size = i_size_read(&ci->vfs_inode);
1878 /* mds will adjust max size according to the reported size */
1879 if (ci->i_flushing_caps & CEPH_CAP_FILE_WR)
1881 if (size >= ci->i_max_size)
1883 /* half of previous max_size increment has been used */
1884 if (ci->i_max_size > ci->i_reported_size &&
1885 (size << 1) >= ci->i_max_size + ci->i_reported_size)
1891 * Swiss army knife function to examine currently used and wanted
1892 * versus held caps. Release, flush, ack revoked caps to mds as
1895 * CHECK_CAPS_AUTHONLY - we should only check the auth cap
1896 * CHECK_CAPS_FLUSH - we should flush any dirty caps immediately, without
1899 void ceph_check_caps(struct ceph_inode_info *ci, int flags,
1900 struct ceph_mds_session *session)
1902 struct inode *inode = &ci->vfs_inode;
1903 struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(inode->i_sb);
1904 struct ceph_cap *cap;
1905 u64 flush_tid, oldest_flush_tid;
1906 int file_wanted, used, cap_used;
1907 int issued, implemented, want, retain, revoking, flushing = 0;
1908 int mds = -1; /* keep track of how far we've gone through i_caps list
1909 to avoid an infinite loop on retry */
1911 bool queue_invalidate = false;
1912 bool tried_invalidate = false;
1915 ceph_get_mds_session(session);
1917 spin_lock(&ci->i_ceph_lock);
1918 if (ci->i_ceph_flags & CEPH_I_FLUSH)
1919 flags |= CHECK_CAPS_FLUSH;
1921 /* Caps wanted by virtue of active open files. */
1922 file_wanted = __ceph_caps_file_wanted(ci);
1924 /* Caps which have active references against them */
1925 used = __ceph_caps_used(ci);
1928 * "issued" represents the current caps that the MDS wants us to have.
1929 * "implemented" is the set that we have been granted, and includes the
1930 * ones that have not yet been returned to the MDS (the "revoking" set,
1931 * usually because they have outstanding references).
1933 issued = __ceph_caps_issued(ci, &implemented);
1934 revoking = implemented & ~issued;
1938 /* The ones we currently want to retain (may be adjusted below) */
1939 retain = file_wanted | used | CEPH_CAP_PIN;
1940 if (!mdsc->stopping && inode->i_nlink > 0) {
1942 retain |= CEPH_CAP_ANY; /* be greedy */
1943 } else if (S_ISDIR(inode->i_mode) &&
1944 (issued & CEPH_CAP_FILE_SHARED) &&
1945 __ceph_dir_is_complete(ci)) {
1947 * If a directory is complete, we want to keep
1948 * the exclusive cap. So that MDS does not end up
1949 * revoking the shared cap on every create/unlink
1952 if (IS_RDONLY(inode)) {
1953 want = CEPH_CAP_ANY_SHARED;
1955 want |= CEPH_CAP_ANY_SHARED | CEPH_CAP_FILE_EXCL;
1960 retain |= CEPH_CAP_ANY_SHARED;
1962 * keep RD only if we didn't have the file open RW,
1963 * because then the mds would revoke it anyway to
1964 * journal max_size=0.
1966 if (ci->i_max_size == 0)
1967 retain |= CEPH_CAP_ANY_RD;
1971 dout("check_caps %p file_want %s used %s dirty %s flushing %s"
1972 " issued %s revoking %s retain %s %s%s\n", inode,
1973 ceph_cap_string(file_wanted),
1974 ceph_cap_string(used), ceph_cap_string(ci->i_dirty_caps),
1975 ceph_cap_string(ci->i_flushing_caps),
1976 ceph_cap_string(issued), ceph_cap_string(revoking),
1977 ceph_cap_string(retain),
1978 (flags & CHECK_CAPS_AUTHONLY) ? " AUTHONLY" : "",
1979 (flags & CHECK_CAPS_FLUSH) ? " FLUSH" : "");
1982 * If we no longer need to hold onto old our caps, and we may
1983 * have cached pages, but don't want them, then try to invalidate.
1984 * If we fail, it's because pages are locked.... try again later.
1986 if ((!(flags & CHECK_CAPS_NOINVAL) || mdsc->stopping) &&
1987 S_ISREG(inode->i_mode) &&
1988 !(ci->i_wb_ref || ci->i_wrbuffer_ref) && /* no dirty pages... */
1989 inode->i_data.nrpages && /* have cached pages */
1990 (revoking & (CEPH_CAP_FILE_CACHE|
1991 CEPH_CAP_FILE_LAZYIO)) && /* or revoking cache */
1992 !tried_invalidate) {
1993 dout("check_caps trying to invalidate on %p\n", inode);
1994 if (try_nonblocking_invalidate(inode) < 0) {
1995 dout("check_caps queuing invalidate\n");
1996 queue_invalidate = true;
1997 ci->i_rdcache_revoking = ci->i_rdcache_gen;
1999 tried_invalidate = true;
2003 for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
2005 struct cap_msg_args arg;
2007 cap = rb_entry(p, struct ceph_cap, ci_node);
2009 /* avoid looping forever */
2010 if (mds >= cap->mds ||
2011 ((flags & CHECK_CAPS_AUTHONLY) && cap != ci->i_auth_cap))
2015 * If we have an auth cap, we don't need to consider any
2016 * overlapping caps as used.
2019 if (ci->i_auth_cap && cap != ci->i_auth_cap)
2020 cap_used &= ~ci->i_auth_cap->issued;
2022 revoking = cap->implemented & ~cap->issued;
2023 dout(" mds%d cap %p used %s issued %s implemented %s revoking %s\n",
2024 cap->mds, cap, ceph_cap_string(cap_used),
2025 ceph_cap_string(cap->issued),
2026 ceph_cap_string(cap->implemented),
2027 ceph_cap_string(revoking));
2029 if (cap == ci->i_auth_cap &&
2030 (cap->issued & CEPH_CAP_FILE_WR)) {
2031 /* request larger max_size from MDS? */
2032 if (ci->i_wanted_max_size > ci->i_max_size &&
2033 ci->i_wanted_max_size > ci->i_requested_max_size) {
2034 dout("requesting new max_size\n");
2038 /* approaching file_max? */
2039 if (__ceph_should_report_size(ci)) {
2040 dout("i_size approaching max_size\n");
2044 /* flush anything dirty? */
2045 if (cap == ci->i_auth_cap) {
2046 if ((flags & CHECK_CAPS_FLUSH) && ci->i_dirty_caps) {
2047 dout("flushing dirty caps\n");
2050 if (ci->i_ceph_flags & CEPH_I_FLUSH_SNAPS) {
2051 dout("flushing snap caps\n");
2056 /* completed revocation? going down and there are no caps? */
2057 if (revoking && (revoking & cap_used) == 0) {
2058 dout("completed revocation of %s\n",
2059 ceph_cap_string(cap->implemented & ~cap->issued));
2063 /* want more caps from mds? */
2064 if (want & ~cap->mds_wanted) {
2065 if (want & ~(cap->mds_wanted | cap->issued))
2067 if (!__cap_is_valid(cap))
2071 /* things we might delay */
2072 if ((cap->issued & ~retain) == 0)
2073 continue; /* nope, all good */
2076 ceph_put_mds_session(session);
2077 session = ceph_get_mds_session(cap->session);
2079 /* kick flushing and flush snaps before sending normal
2081 if (cap == ci->i_auth_cap &&
2083 (CEPH_I_KICK_FLUSH | CEPH_I_FLUSH_SNAPS))) {
2084 if (ci->i_ceph_flags & CEPH_I_KICK_FLUSH)
2085 __kick_flushing_caps(mdsc, session, ci, 0);
2086 if (ci->i_ceph_flags & CEPH_I_FLUSH_SNAPS)
2087 __ceph_flush_snaps(ci, session);
2092 if (cap == ci->i_auth_cap && ci->i_dirty_caps) {
2093 flushing = ci->i_dirty_caps;
2094 flush_tid = __mark_caps_flushing(inode, session, false,
2096 if (flags & CHECK_CAPS_FLUSH &&
2097 list_empty(&session->s_cap_dirty))
2098 mflags |= CEPH_CLIENT_CAPS_SYNC;
2102 spin_lock(&mdsc->cap_dirty_lock);
2103 oldest_flush_tid = __get_oldest_flush_tid(mdsc);
2104 spin_unlock(&mdsc->cap_dirty_lock);
2107 mds = cap->mds; /* remember mds, so we don't repeat */
2109 __prep_cap(&arg, cap, CEPH_CAP_OP_UPDATE, mflags, cap_used,
2110 want, retain, flushing, flush_tid, oldest_flush_tid);
2112 spin_unlock(&ci->i_ceph_lock);
2113 __send_cap(&arg, ci);
2114 spin_lock(&ci->i_ceph_lock);
2116 goto retry; /* retake i_ceph_lock and restart our cap scan. */
2119 /* periodically re-calculate caps wanted by open files */
2120 if (__ceph_is_any_real_caps(ci) &&
2121 list_empty(&ci->i_cap_delay_list) &&
2122 (file_wanted & ~CEPH_CAP_PIN) &&
2123 !(used & (CEPH_CAP_FILE_RD | CEPH_CAP_ANY_FILE_WR))) {
2124 __cap_delay_requeue(mdsc, ci);
2127 spin_unlock(&ci->i_ceph_lock);
2129 ceph_put_mds_session(session);
2130 if (queue_invalidate)
2131 ceph_queue_invalidate(inode);
2135 * Try to flush dirty caps back to the auth mds.
2137 static int try_flush_caps(struct inode *inode, u64 *ptid)
2139 struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
2140 struct ceph_inode_info *ci = ceph_inode(inode);
2142 u64 flush_tid = 0, oldest_flush_tid = 0;
2144 spin_lock(&ci->i_ceph_lock);
2146 if (ci->i_dirty_caps && ci->i_auth_cap) {
2147 struct ceph_cap *cap = ci->i_auth_cap;
2148 struct cap_msg_args arg;
2149 struct ceph_mds_session *session = cap->session;
2151 if (session->s_state < CEPH_MDS_SESSION_OPEN) {
2152 spin_unlock(&ci->i_ceph_lock);
2156 if (ci->i_ceph_flags &
2157 (CEPH_I_KICK_FLUSH | CEPH_I_FLUSH_SNAPS)) {
2158 if (ci->i_ceph_flags & CEPH_I_KICK_FLUSH)
2159 __kick_flushing_caps(mdsc, session, ci, 0);
2160 if (ci->i_ceph_flags & CEPH_I_FLUSH_SNAPS)
2161 __ceph_flush_snaps(ci, session);
2165 flushing = ci->i_dirty_caps;
2166 flush_tid = __mark_caps_flushing(inode, session, true,
2169 __prep_cap(&arg, cap, CEPH_CAP_OP_FLUSH, CEPH_CLIENT_CAPS_SYNC,
2170 __ceph_caps_used(ci), __ceph_caps_wanted(ci),
2171 (cap->issued | cap->implemented),
2172 flushing, flush_tid, oldest_flush_tid);
2173 spin_unlock(&ci->i_ceph_lock);
2175 __send_cap(&arg, ci);
2177 if (!list_empty(&ci->i_cap_flush_list)) {
2178 struct ceph_cap_flush *cf =
2179 list_last_entry(&ci->i_cap_flush_list,
2180 struct ceph_cap_flush, i_list);
2182 flush_tid = cf->tid;
2184 flushing = ci->i_flushing_caps;
2185 spin_unlock(&ci->i_ceph_lock);
2193 * Return true if we've flushed caps through the given flush_tid.
2195 static int caps_are_flushed(struct inode *inode, u64 flush_tid)
2197 struct ceph_inode_info *ci = ceph_inode(inode);
2200 spin_lock(&ci->i_ceph_lock);
2201 if (!list_empty(&ci->i_cap_flush_list)) {
2202 struct ceph_cap_flush * cf =
2203 list_first_entry(&ci->i_cap_flush_list,
2204 struct ceph_cap_flush, i_list);
2205 if (cf->tid <= flush_tid)
2208 spin_unlock(&ci->i_ceph_lock);
2213 * wait for any unsafe requests to complete.
2215 static int unsafe_request_wait(struct inode *inode)
2217 struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
2218 struct ceph_inode_info *ci = ceph_inode(inode);
2219 struct ceph_mds_request *req1 = NULL, *req2 = NULL;
2222 spin_lock(&ci->i_unsafe_lock);
2223 if (S_ISDIR(inode->i_mode) && !list_empty(&ci->i_unsafe_dirops)) {
2224 req1 = list_last_entry(&ci->i_unsafe_dirops,
2225 struct ceph_mds_request,
2227 ceph_mdsc_get_request(req1);
2229 if (!list_empty(&ci->i_unsafe_iops)) {
2230 req2 = list_last_entry(&ci->i_unsafe_iops,
2231 struct ceph_mds_request,
2232 r_unsafe_target_item);
2233 ceph_mdsc_get_request(req2);
2235 spin_unlock(&ci->i_unsafe_lock);
2238 * Trigger to flush the journal logs in all the relevant MDSes
2239 * manually, or in the worst case we must wait at most 5 seconds
2240 * to wait the journal logs to be flushed by the MDSes periodically.
2243 struct ceph_mds_session **sessions = NULL;
2244 struct ceph_mds_session *s;
2245 struct ceph_mds_request *req;
2250 * The mdsc->max_sessions is unlikely to be changed
2251 * mostly, here we will retry it by reallocating the
2252 * sessions arrary memory to get rid of the mdsc->mutex
2256 max = mdsc->max_sessions;
2257 sessions = krealloc(sessions, max * sizeof(s), __GFP_ZERO);
2261 spin_lock(&ci->i_unsafe_lock);
2263 list_for_each_entry(req, &ci->i_unsafe_dirops,
2264 r_unsafe_dir_item) {
2266 if (unlikely(s->s_mds >= max)) {
2267 spin_unlock(&ci->i_unsafe_lock);
2270 if (!sessions[s->s_mds]) {
2271 s = ceph_get_mds_session(s);
2272 sessions[s->s_mds] = s;
2277 list_for_each_entry(req, &ci->i_unsafe_iops,
2278 r_unsafe_target_item) {
2280 if (unlikely(s->s_mds >= max)) {
2281 spin_unlock(&ci->i_unsafe_lock);
2284 if (!sessions[s->s_mds]) {
2285 s = ceph_get_mds_session(s);
2286 sessions[s->s_mds] = s;
2290 spin_unlock(&ci->i_unsafe_lock);
2293 spin_lock(&ci->i_ceph_lock);
2294 if (ci->i_auth_cap) {
2295 s = ci->i_auth_cap->session;
2296 if (!sessions[s->s_mds])
2297 sessions[s->s_mds] = ceph_get_mds_session(s);
2299 spin_unlock(&ci->i_ceph_lock);
2301 /* send flush mdlog request to MDSes */
2302 for (i = 0; i < max; i++) {
2305 send_flush_mdlog(s);
2306 ceph_put_mds_session(s);
2312 dout("unsafe_request_wait %p wait on tid %llu %llu\n",
2313 inode, req1 ? req1->r_tid : 0ULL, req2 ? req2->r_tid : 0ULL);
2315 ret = !wait_for_completion_timeout(&req1->r_safe_completion,
2316 ceph_timeout_jiffies(req1->r_timeout));
2319 ceph_mdsc_put_request(req1);
2322 ret = !wait_for_completion_timeout(&req2->r_safe_completion,
2323 ceph_timeout_jiffies(req2->r_timeout));
2326 ceph_mdsc_put_request(req2);
2331 int ceph_fsync(struct file *file, loff_t start, loff_t end, int datasync)
2333 struct inode *inode = file->f_mapping->host;
2334 struct ceph_inode_info *ci = ceph_inode(inode);
2339 dout("fsync %p%s\n", inode, datasync ? " datasync" : "");
2341 ret = file_write_and_wait_range(file, start, end);
2345 ret = ceph_wait_on_async_create(inode);
2349 dirty = try_flush_caps(inode, &flush_tid);
2350 dout("fsync dirty caps are %s\n", ceph_cap_string(dirty));
2352 err = unsafe_request_wait(inode);
2355 * only wait on non-file metadata writeback (the mds
2356 * can recover size and mtime, so we don't need to
2359 if (!err && (dirty & ~CEPH_CAP_ANY_FILE_WR)) {
2360 err = wait_event_interruptible(ci->i_cap_wq,
2361 caps_are_flushed(inode, flush_tid));
2367 err = file_check_and_advance_wb_err(file);
2371 dout("fsync %p%s result=%d\n", inode, datasync ? " datasync" : "", ret);
2376 * Flush any dirty caps back to the mds. If we aren't asked to wait,
2377 * queue inode for flush but don't do so immediately, because we can
2378 * get by with fewer MDS messages if we wait for data writeback to
2381 int ceph_write_inode(struct inode *inode, struct writeback_control *wbc)
2383 struct ceph_inode_info *ci = ceph_inode(inode);
2387 int wait = (wbc->sync_mode == WB_SYNC_ALL && !wbc->for_sync);
2389 dout("write_inode %p wait=%d\n", inode, wait);
2391 dirty = try_flush_caps(inode, &flush_tid);
2393 err = wait_event_interruptible(ci->i_cap_wq,
2394 caps_are_flushed(inode, flush_tid));
2396 struct ceph_mds_client *mdsc =
2397 ceph_sb_to_client(inode->i_sb)->mdsc;
2399 spin_lock(&ci->i_ceph_lock);
2400 if (__ceph_caps_dirty(ci))
2401 __cap_delay_requeue_front(mdsc, ci);
2402 spin_unlock(&ci->i_ceph_lock);
2407 static void __kick_flushing_caps(struct ceph_mds_client *mdsc,
2408 struct ceph_mds_session *session,
2409 struct ceph_inode_info *ci,
2410 u64 oldest_flush_tid)
2411 __releases(ci->i_ceph_lock)
2412 __acquires(ci->i_ceph_lock)
2414 struct inode *inode = &ci->vfs_inode;
2415 struct ceph_cap *cap;
2416 struct ceph_cap_flush *cf;
2419 u64 last_snap_flush = 0;
2421 ci->i_ceph_flags &= ~CEPH_I_KICK_FLUSH;
2423 list_for_each_entry_reverse(cf, &ci->i_cap_flush_list, i_list) {
2424 if (cf->is_capsnap) {
2425 last_snap_flush = cf->tid;
2430 list_for_each_entry(cf, &ci->i_cap_flush_list, i_list) {
2431 if (cf->tid < first_tid)
2434 cap = ci->i_auth_cap;
2435 if (!(cap && cap->session == session)) {
2436 pr_err("%p auth cap %p not mds%d ???\n",
2437 inode, cap, session->s_mds);
2441 first_tid = cf->tid + 1;
2443 if (!cf->is_capsnap) {
2444 struct cap_msg_args arg;
2446 dout("kick_flushing_caps %p cap %p tid %llu %s\n",
2447 inode, cap, cf->tid, ceph_cap_string(cf->caps));
2448 __prep_cap(&arg, cap, CEPH_CAP_OP_FLUSH,
2449 (cf->tid < last_snap_flush ?
2450 CEPH_CLIENT_CAPS_PENDING_CAPSNAP : 0),
2451 __ceph_caps_used(ci),
2452 __ceph_caps_wanted(ci),
2453 (cap->issued | cap->implemented),
2454 cf->caps, cf->tid, oldest_flush_tid);
2455 spin_unlock(&ci->i_ceph_lock);
2456 __send_cap(&arg, ci);
2458 struct ceph_cap_snap *capsnap =
2459 container_of(cf, struct ceph_cap_snap,
2461 dout("kick_flushing_caps %p capsnap %p tid %llu %s\n",
2462 inode, capsnap, cf->tid,
2463 ceph_cap_string(capsnap->dirty));
2465 refcount_inc(&capsnap->nref);
2466 spin_unlock(&ci->i_ceph_lock);
2468 ret = __send_flush_snap(inode, session, capsnap, cap->mseq,
2471 pr_err("kick_flushing_caps: error sending "
2472 "cap flushsnap, ino (%llx.%llx) "
2473 "tid %llu follows %llu\n",
2474 ceph_vinop(inode), cf->tid,
2478 ceph_put_cap_snap(capsnap);
2481 spin_lock(&ci->i_ceph_lock);
2485 void ceph_early_kick_flushing_caps(struct ceph_mds_client *mdsc,
2486 struct ceph_mds_session *session)
2488 struct ceph_inode_info *ci;
2489 struct ceph_cap *cap;
2490 u64 oldest_flush_tid;
2492 dout("early_kick_flushing_caps mds%d\n", session->s_mds);
2494 spin_lock(&mdsc->cap_dirty_lock);
2495 oldest_flush_tid = __get_oldest_flush_tid(mdsc);
2496 spin_unlock(&mdsc->cap_dirty_lock);
2498 list_for_each_entry(ci, &session->s_cap_flushing, i_flushing_item) {
2499 spin_lock(&ci->i_ceph_lock);
2500 cap = ci->i_auth_cap;
2501 if (!(cap && cap->session == session)) {
2502 pr_err("%p auth cap %p not mds%d ???\n",
2503 &ci->vfs_inode, cap, session->s_mds);
2504 spin_unlock(&ci->i_ceph_lock);
2510 * if flushing caps were revoked, we re-send the cap flush
2511 * in client reconnect stage. This guarantees MDS * processes
2512 * the cap flush message before issuing the flushing caps to
2515 if ((cap->issued & ci->i_flushing_caps) !=
2516 ci->i_flushing_caps) {
2517 /* encode_caps_cb() also will reset these sequence
2518 * numbers. make sure sequence numbers in cap flush
2519 * message match later reconnect message */
2523 __kick_flushing_caps(mdsc, session, ci,
2526 ci->i_ceph_flags |= CEPH_I_KICK_FLUSH;
2529 spin_unlock(&ci->i_ceph_lock);
2533 void ceph_kick_flushing_caps(struct ceph_mds_client *mdsc,
2534 struct ceph_mds_session *session)
2536 struct ceph_inode_info *ci;
2537 struct ceph_cap *cap;
2538 u64 oldest_flush_tid;
2540 lockdep_assert_held(&session->s_mutex);
2542 dout("kick_flushing_caps mds%d\n", session->s_mds);
2544 spin_lock(&mdsc->cap_dirty_lock);
2545 oldest_flush_tid = __get_oldest_flush_tid(mdsc);
2546 spin_unlock(&mdsc->cap_dirty_lock);
2548 list_for_each_entry(ci, &session->s_cap_flushing, i_flushing_item) {
2549 spin_lock(&ci->i_ceph_lock);
2550 cap = ci->i_auth_cap;
2551 if (!(cap && cap->session == session)) {
2552 pr_err("%p auth cap %p not mds%d ???\n",
2553 &ci->vfs_inode, cap, session->s_mds);
2554 spin_unlock(&ci->i_ceph_lock);
2557 if (ci->i_ceph_flags & CEPH_I_KICK_FLUSH) {
2558 __kick_flushing_caps(mdsc, session, ci,
2561 spin_unlock(&ci->i_ceph_lock);
2565 void ceph_kick_flushing_inode_caps(struct ceph_mds_session *session,
2566 struct ceph_inode_info *ci)
2568 struct ceph_mds_client *mdsc = session->s_mdsc;
2569 struct ceph_cap *cap = ci->i_auth_cap;
2571 lockdep_assert_held(&ci->i_ceph_lock);
2573 dout("%s %p flushing %s\n", __func__, &ci->vfs_inode,
2574 ceph_cap_string(ci->i_flushing_caps));
2576 if (!list_empty(&ci->i_cap_flush_list)) {
2577 u64 oldest_flush_tid;
2578 spin_lock(&mdsc->cap_dirty_lock);
2579 list_move_tail(&ci->i_flushing_item,
2580 &cap->session->s_cap_flushing);
2581 oldest_flush_tid = __get_oldest_flush_tid(mdsc);
2582 spin_unlock(&mdsc->cap_dirty_lock);
2584 __kick_flushing_caps(mdsc, session, ci, oldest_flush_tid);
2590 * Take references to capabilities we hold, so that we don't release
2591 * them to the MDS prematurely.
2593 void ceph_take_cap_refs(struct ceph_inode_info *ci, int got,
2594 bool snap_rwsem_locked)
2596 lockdep_assert_held(&ci->i_ceph_lock);
2598 if (got & CEPH_CAP_PIN)
2600 if (got & CEPH_CAP_FILE_RD)
2602 if (got & CEPH_CAP_FILE_CACHE)
2603 ci->i_rdcache_ref++;
2604 if (got & CEPH_CAP_FILE_EXCL)
2606 if (got & CEPH_CAP_FILE_WR) {
2607 if (ci->i_wr_ref == 0 && !ci->i_head_snapc) {
2608 BUG_ON(!snap_rwsem_locked);
2609 ci->i_head_snapc = ceph_get_snap_context(
2610 ci->i_snap_realm->cached_context);
2614 if (got & CEPH_CAP_FILE_BUFFER) {
2615 if (ci->i_wb_ref == 0)
2616 ihold(&ci->vfs_inode);
2618 dout("%s %p wb %d -> %d (?)\n", __func__,
2619 &ci->vfs_inode, ci->i_wb_ref-1, ci->i_wb_ref);
2624 * Try to grab cap references. Specify those refs we @want, and the
2625 * minimal set we @need. Also include the larger offset we are writing
2626 * to (when applicable), and check against max_size here as well.
2627 * Note that caller is responsible for ensuring max_size increases are
2628 * requested from the MDS.
2630 * Returns 0 if caps were not able to be acquired (yet), 1 if succeed,
2631 * or a negative error code. There are 3 speical error codes:
2632 * -EAGAIN: need to sleep but non-blocking is specified
2633 * -EFBIG: ask caller to call check_max_size() and try again.
2634 * -ESTALE: ask caller to call ceph_renew_caps() and try again.
2637 /* first 8 bits are reserved for CEPH_FILE_MODE_FOO */
2638 NON_BLOCKING = (1 << 8),
2639 CHECK_FILELOCK = (1 << 9),
2642 static int try_get_cap_refs(struct inode *inode, int need, int want,
2643 loff_t endoff, int flags, int *got)
2645 struct ceph_inode_info *ci = ceph_inode(inode);
2646 struct ceph_mds_client *mdsc = ceph_inode_to_client(inode)->mdsc;
2648 int have, implemented;
2649 bool snap_rwsem_locked = false;
2651 dout("get_cap_refs %p need %s want %s\n", inode,
2652 ceph_cap_string(need), ceph_cap_string(want));
2655 spin_lock(&ci->i_ceph_lock);
2657 if ((flags & CHECK_FILELOCK) &&
2658 (ci->i_ceph_flags & CEPH_I_ERROR_FILELOCK)) {
2659 dout("try_get_cap_refs %p error filelock\n", inode);
2664 /* finish pending truncate */
2665 while (ci->i_truncate_pending) {
2666 spin_unlock(&ci->i_ceph_lock);
2667 if (snap_rwsem_locked) {
2668 up_read(&mdsc->snap_rwsem);
2669 snap_rwsem_locked = false;
2671 __ceph_do_pending_vmtruncate(inode);
2672 spin_lock(&ci->i_ceph_lock);
2675 have = __ceph_caps_issued(ci, &implemented);
2677 if (have & need & CEPH_CAP_FILE_WR) {
2678 if (endoff >= 0 && endoff > (loff_t)ci->i_max_size) {
2679 dout("get_cap_refs %p endoff %llu > maxsize %llu\n",
2680 inode, endoff, ci->i_max_size);
2681 if (endoff > ci->i_requested_max_size)
2682 ret = ci->i_auth_cap ? -EFBIG : -ESTALE;
2686 * If a sync write is in progress, we must wait, so that we
2687 * can get a final snapshot value for size+mtime.
2689 if (__ceph_have_pending_cap_snap(ci)) {
2690 dout("get_cap_refs %p cap_snap_pending\n", inode);
2695 if ((have & need) == need) {
2697 * Look at (implemented & ~have & not) so that we keep waiting
2698 * on transition from wanted -> needed caps. This is needed
2699 * for WRBUFFER|WR -> WR to avoid a new WR sync write from
2700 * going before a prior buffered writeback happens.
2702 int not = want & ~(have & need);
2703 int revoking = implemented & ~have;
2704 dout("get_cap_refs %p have %s but not %s (revoking %s)\n",
2705 inode, ceph_cap_string(have), ceph_cap_string(not),
2706 ceph_cap_string(revoking));
2707 if ((revoking & not) == 0) {
2708 if (!snap_rwsem_locked &&
2709 !ci->i_head_snapc &&
2710 (need & CEPH_CAP_FILE_WR)) {
2711 if (!down_read_trylock(&mdsc->snap_rwsem)) {
2713 * we can not call down_read() when
2714 * task isn't in TASK_RUNNING state
2716 if (flags & NON_BLOCKING) {
2721 spin_unlock(&ci->i_ceph_lock);
2722 down_read(&mdsc->snap_rwsem);
2723 snap_rwsem_locked = true;
2726 snap_rwsem_locked = true;
2728 if ((have & want) == want)
2732 ceph_take_cap_refs(ci, *got, true);
2736 int session_readonly = false;
2738 if (ci->i_auth_cap &&
2739 (need & (CEPH_CAP_FILE_WR | CEPH_CAP_FILE_EXCL))) {
2740 struct ceph_mds_session *s = ci->i_auth_cap->session;
2741 spin_lock(&s->s_cap_lock);
2742 session_readonly = s->s_readonly;
2743 spin_unlock(&s->s_cap_lock);
2745 if (session_readonly) {
2746 dout("get_cap_refs %p need %s but mds%d readonly\n",
2747 inode, ceph_cap_string(need), ci->i_auth_cap->mds);
2752 if (READ_ONCE(mdsc->fsc->mount_state) >= CEPH_MOUNT_SHUTDOWN) {
2753 dout("get_cap_refs %p forced umount\n", inode);
2757 mds_wanted = __ceph_caps_mds_wanted(ci, false);
2758 if (need & ~mds_wanted) {
2759 dout("get_cap_refs %p need %s > mds_wanted %s\n",
2760 inode, ceph_cap_string(need),
2761 ceph_cap_string(mds_wanted));
2766 dout("get_cap_refs %p have %s need %s\n", inode,
2767 ceph_cap_string(have), ceph_cap_string(need));
2771 __ceph_touch_fmode(ci, mdsc, flags);
2773 spin_unlock(&ci->i_ceph_lock);
2774 if (snap_rwsem_locked)
2775 up_read(&mdsc->snap_rwsem);
2778 ceph_update_cap_mis(&mdsc->metric);
2780 ceph_update_cap_hit(&mdsc->metric);
2782 dout("get_cap_refs %p ret %d got %s\n", inode,
2783 ret, ceph_cap_string(*got));
2788 * Check the offset we are writing up to against our current
2789 * max_size. If necessary, tell the MDS we want to write to
2792 static void check_max_size(struct inode *inode, loff_t endoff)
2794 struct ceph_inode_info *ci = ceph_inode(inode);
2797 /* do we need to explicitly request a larger max_size? */
2798 spin_lock(&ci->i_ceph_lock);
2799 if (endoff >= ci->i_max_size && endoff > ci->i_wanted_max_size) {
2800 dout("write %p at large endoff %llu, req max_size\n",
2802 ci->i_wanted_max_size = endoff;
2804 /* duplicate ceph_check_caps()'s logic */
2805 if (ci->i_auth_cap &&
2806 (ci->i_auth_cap->issued & CEPH_CAP_FILE_WR) &&
2807 ci->i_wanted_max_size > ci->i_max_size &&
2808 ci->i_wanted_max_size > ci->i_requested_max_size)
2810 spin_unlock(&ci->i_ceph_lock);
2812 ceph_check_caps(ci, CHECK_CAPS_AUTHONLY, NULL);
2815 static inline int get_used_fmode(int caps)
2818 if (caps & CEPH_CAP_FILE_RD)
2819 fmode |= CEPH_FILE_MODE_RD;
2820 if (caps & CEPH_CAP_FILE_WR)
2821 fmode |= CEPH_FILE_MODE_WR;
2825 int ceph_try_get_caps(struct inode *inode, int need, int want,
2826 bool nonblock, int *got)
2830 BUG_ON(need & ~CEPH_CAP_FILE_RD);
2831 BUG_ON(want & ~(CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO |
2832 CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_EXCL |
2833 CEPH_CAP_ANY_DIR_OPS));
2835 ret = ceph_pool_perm_check(inode, need);
2840 flags = get_used_fmode(need | want);
2842 flags |= NON_BLOCKING;
2844 ret = try_get_cap_refs(inode, need, want, 0, flags, got);
2845 /* three special error codes */
2846 if (ret == -EAGAIN || ret == -EFBIG || ret == -ESTALE)
2852 * Wait for caps, and take cap references. If we can't get a WR cap
2853 * due to a small max_size, make sure we check_max_size (and possibly
2854 * ask the mds) so we don't get hung up indefinitely.
2856 int ceph_get_caps(struct file *filp, int need, int want, loff_t endoff, int *got)
2858 struct ceph_file_info *fi = filp->private_data;
2859 struct inode *inode = file_inode(filp);
2860 struct ceph_inode_info *ci = ceph_inode(inode);
2861 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
2862 int ret, _got, flags;
2864 ret = ceph_pool_perm_check(inode, need);
2868 if ((fi->fmode & CEPH_FILE_MODE_WR) &&
2869 fi->filp_gen != READ_ONCE(fsc->filp_gen))
2872 flags = get_used_fmode(need | want);
2875 flags &= CEPH_FILE_MODE_MASK;
2876 if (atomic_read(&fi->num_locks))
2877 flags |= CHECK_FILELOCK;
2879 ret = try_get_cap_refs(inode, need, want, endoff,
2881 WARN_ON_ONCE(ret == -EAGAIN);
2883 struct ceph_mds_client *mdsc = fsc->mdsc;
2885 DEFINE_WAIT_FUNC(wait, woken_wake_function);
2887 cw.ino = ceph_ino(inode);
2888 cw.tgid = current->tgid;
2892 spin_lock(&mdsc->caps_list_lock);
2893 list_add(&cw.list, &mdsc->cap_wait_list);
2894 spin_unlock(&mdsc->caps_list_lock);
2896 /* make sure used fmode not timeout */
2897 ceph_get_fmode(ci, flags, FMODE_WAIT_BIAS);
2898 add_wait_queue(&ci->i_cap_wq, &wait);
2900 flags |= NON_BLOCKING;
2901 while (!(ret = try_get_cap_refs(inode, need, want,
2902 endoff, flags, &_got))) {
2903 if (signal_pending(current)) {
2907 wait_woken(&wait, TASK_INTERRUPTIBLE, MAX_SCHEDULE_TIMEOUT);
2910 remove_wait_queue(&ci->i_cap_wq, &wait);
2911 ceph_put_fmode(ci, flags, FMODE_WAIT_BIAS);
2913 spin_lock(&mdsc->caps_list_lock);
2915 spin_unlock(&mdsc->caps_list_lock);
2921 if ((fi->fmode & CEPH_FILE_MODE_WR) &&
2922 fi->filp_gen != READ_ONCE(fsc->filp_gen)) {
2923 if (ret >= 0 && _got)
2924 ceph_put_cap_refs(ci, _got);
2929 if (ret == -EFBIG || ret == -ESTALE) {
2930 int ret2 = ceph_wait_on_async_create(inode);
2934 if (ret == -EFBIG) {
2935 check_max_size(inode, endoff);
2938 if (ret == -ESTALE) {
2939 /* session was killed, try renew caps */
2940 ret = ceph_renew_caps(inode, flags);
2947 if (S_ISREG(ci->vfs_inode.i_mode) &&
2948 ci->i_inline_version != CEPH_INLINE_NONE &&
2949 (_got & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) &&
2950 i_size_read(inode) > 0) {
2952 find_get_page(inode->i_mapping, 0);
2954 bool uptodate = PageUptodate(page);
2961 * drop cap refs first because getattr while
2962 * holding * caps refs can cause deadlock.
2964 ceph_put_cap_refs(ci, _got);
2968 * getattr request will bring inline data into
2971 ret = __ceph_do_getattr(inode, NULL,
2972 CEPH_STAT_CAP_INLINE_DATA,
2985 * Take cap refs. Caller must already know we hold at least one ref
2986 * on the caps in question or we don't know this is safe.
2988 void ceph_get_cap_refs(struct ceph_inode_info *ci, int caps)
2990 spin_lock(&ci->i_ceph_lock);
2991 ceph_take_cap_refs(ci, caps, false);
2992 spin_unlock(&ci->i_ceph_lock);
2997 * drop cap_snap that is not associated with any snapshot.
2998 * we don't need to send FLUSHSNAP message for it.
3000 static int ceph_try_drop_cap_snap(struct ceph_inode_info *ci,
3001 struct ceph_cap_snap *capsnap)
3003 if (!capsnap->need_flush &&
3004 !capsnap->writing && !capsnap->dirty_pages) {
3005 dout("dropping cap_snap %p follows %llu\n",
3006 capsnap, capsnap->follows);
3007 BUG_ON(capsnap->cap_flush.tid > 0);
3008 ceph_put_snap_context(capsnap->context);
3009 if (!list_is_last(&capsnap->ci_item, &ci->i_cap_snaps))
3010 ci->i_ceph_flags |= CEPH_I_FLUSH_SNAPS;
3012 list_del(&capsnap->ci_item);
3013 ceph_put_cap_snap(capsnap);
3019 enum put_cap_refs_mode {
3020 PUT_CAP_REFS_SYNC = 0,
3021 PUT_CAP_REFS_NO_CHECK,
3028 * If we released the last ref on any given cap, call ceph_check_caps
3029 * to release (or schedule a release).
3031 * If we are releasing a WR cap (from a sync write), finalize any affected
3032 * cap_snap, and wake up any waiters.
3034 static void __ceph_put_cap_refs(struct ceph_inode_info *ci, int had,
3035 enum put_cap_refs_mode mode)
3037 struct inode *inode = &ci->vfs_inode;
3038 int last = 0, put = 0, flushsnaps = 0, wake = 0;
3039 bool check_flushsnaps = false;
3041 spin_lock(&ci->i_ceph_lock);
3042 if (had & CEPH_CAP_PIN)
3044 if (had & CEPH_CAP_FILE_RD)
3045 if (--ci->i_rd_ref == 0)
3047 if (had & CEPH_CAP_FILE_CACHE)
3048 if (--ci->i_rdcache_ref == 0)
3050 if (had & CEPH_CAP_FILE_EXCL)
3051 if (--ci->i_fx_ref == 0)
3053 if (had & CEPH_CAP_FILE_BUFFER) {
3054 if (--ci->i_wb_ref == 0) {
3056 /* put the ref held by ceph_take_cap_refs() */
3058 check_flushsnaps = true;
3060 dout("put_cap_refs %p wb %d -> %d (?)\n",
3061 inode, ci->i_wb_ref+1, ci->i_wb_ref);
3063 if (had & CEPH_CAP_FILE_WR) {
3064 if (--ci->i_wr_ref == 0) {
3066 check_flushsnaps = true;
3067 if (ci->i_wrbuffer_ref_head == 0 &&
3068 ci->i_dirty_caps == 0 &&
3069 ci->i_flushing_caps == 0) {
3070 BUG_ON(!ci->i_head_snapc);
3071 ceph_put_snap_context(ci->i_head_snapc);
3072 ci->i_head_snapc = NULL;
3074 /* see comment in __ceph_remove_cap() */
3075 if (!__ceph_is_any_real_caps(ci) && ci->i_snap_realm)
3076 ceph_change_snap_realm(inode, NULL);
3079 if (check_flushsnaps && __ceph_have_pending_cap_snap(ci)) {
3080 struct ceph_cap_snap *capsnap =
3081 list_last_entry(&ci->i_cap_snaps,
3082 struct ceph_cap_snap,
3085 capsnap->writing = 0;
3086 if (ceph_try_drop_cap_snap(ci, capsnap))
3087 /* put the ref held by ceph_queue_cap_snap() */
3089 else if (__ceph_finish_cap_snap(ci, capsnap))
3093 spin_unlock(&ci->i_ceph_lock);
3095 dout("put_cap_refs %p had %s%s%s\n", inode, ceph_cap_string(had),
3096 last ? " last" : "", put ? " put" : "");
3099 case PUT_CAP_REFS_SYNC:
3101 ceph_check_caps(ci, 0, NULL);
3102 else if (flushsnaps)
3103 ceph_flush_snaps(ci, NULL);
3105 case PUT_CAP_REFS_ASYNC:
3107 ceph_queue_check_caps(inode);
3108 else if (flushsnaps)
3109 ceph_queue_flush_snaps(inode);
3115 wake_up_all(&ci->i_cap_wq);
3120 void ceph_put_cap_refs(struct ceph_inode_info *ci, int had)
3122 __ceph_put_cap_refs(ci, had, PUT_CAP_REFS_SYNC);
3125 void ceph_put_cap_refs_async(struct ceph_inode_info *ci, int had)
3127 __ceph_put_cap_refs(ci, had, PUT_CAP_REFS_ASYNC);
3130 void ceph_put_cap_refs_no_check_caps(struct ceph_inode_info *ci, int had)
3132 __ceph_put_cap_refs(ci, had, PUT_CAP_REFS_NO_CHECK);
3136 * Release @nr WRBUFFER refs on dirty pages for the given @snapc snap
3137 * context. Adjust per-snap dirty page accounting as appropriate.
3138 * Once all dirty data for a cap_snap is flushed, flush snapped file
3139 * metadata back to the MDS. If we dropped the last ref, call
3142 void ceph_put_wrbuffer_cap_refs(struct ceph_inode_info *ci, int nr,
3143 struct ceph_snap_context *snapc)
3145 struct inode *inode = &ci->vfs_inode;
3146 struct ceph_cap_snap *capsnap = NULL;
3150 bool flush_snaps = false;
3151 bool complete_capsnap = false;
3153 spin_lock(&ci->i_ceph_lock);
3154 ci->i_wrbuffer_ref -= nr;
3155 if (ci->i_wrbuffer_ref == 0) {
3160 if (ci->i_head_snapc == snapc) {
3161 ci->i_wrbuffer_ref_head -= nr;
3162 if (ci->i_wrbuffer_ref_head == 0 &&
3163 ci->i_wr_ref == 0 &&
3164 ci->i_dirty_caps == 0 &&
3165 ci->i_flushing_caps == 0) {
3166 BUG_ON(!ci->i_head_snapc);
3167 ceph_put_snap_context(ci->i_head_snapc);
3168 ci->i_head_snapc = NULL;
3170 dout("put_wrbuffer_cap_refs on %p head %d/%d -> %d/%d %s\n",
3172 ci->i_wrbuffer_ref+nr, ci->i_wrbuffer_ref_head+nr,
3173 ci->i_wrbuffer_ref, ci->i_wrbuffer_ref_head,
3174 last ? " LAST" : "");
3176 list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) {
3177 if (capsnap->context == snapc) {
3185 * The capsnap should already be removed when removing
3186 * auth cap in the case of a forced unmount.
3188 WARN_ON_ONCE(ci->i_auth_cap);
3192 capsnap->dirty_pages -= nr;
3193 if (capsnap->dirty_pages == 0) {
3194 complete_capsnap = true;
3195 if (!capsnap->writing) {
3196 if (ceph_try_drop_cap_snap(ci, capsnap)) {
3199 ci->i_ceph_flags |= CEPH_I_FLUSH_SNAPS;
3204 dout("put_wrbuffer_cap_refs on %p cap_snap %p "
3205 " snap %lld %d/%d -> %d/%d %s%s\n",
3206 inode, capsnap, capsnap->context->seq,
3207 ci->i_wrbuffer_ref+nr, capsnap->dirty_pages + nr,
3208 ci->i_wrbuffer_ref, capsnap->dirty_pages,
3209 last ? " (wrbuffer last)" : "",
3210 complete_capsnap ? " (complete capsnap)" : "");
3214 spin_unlock(&ci->i_ceph_lock);
3217 ceph_check_caps(ci, 0, NULL);
3218 } else if (flush_snaps) {
3219 ceph_flush_snaps(ci, NULL);
3221 if (complete_capsnap)
3222 wake_up_all(&ci->i_cap_wq);
3229 * Invalidate unlinked inode's aliases, so we can drop the inode ASAP.
3231 static void invalidate_aliases(struct inode *inode)
3233 struct dentry *dn, *prev = NULL;
3235 dout("invalidate_aliases inode %p\n", inode);
3236 d_prune_aliases(inode);
3238 * For non-directory inode, d_find_alias() only returns
3239 * hashed dentry. After calling d_invalidate(), the
3240 * dentry becomes unhashed.
3242 * For directory inode, d_find_alias() can return
3243 * unhashed dentry. But directory inode should have
3244 * one alias at most.
3246 while ((dn = d_find_alias(inode))) {
3260 struct cap_extra_info {
3261 struct ceph_string *pool_ns;
3271 /* currently issued */
3273 struct timespec64 btime;
3277 * Handle a cap GRANT message from the MDS. (Note that a GRANT may
3278 * actually be a revocation if it specifies a smaller cap set.)
3280 * caller holds s_mutex and i_ceph_lock, we drop both.
3282 static void handle_cap_grant(struct inode *inode,
3283 struct ceph_mds_session *session,
3284 struct ceph_cap *cap,
3285 struct ceph_mds_caps *grant,
3286 struct ceph_buffer *xattr_buf,
3287 struct cap_extra_info *extra_info)
3288 __releases(ci->i_ceph_lock)
3289 __releases(session->s_mdsc->snap_rwsem)
3291 struct ceph_inode_info *ci = ceph_inode(inode);
3292 int seq = le32_to_cpu(grant->seq);
3293 int newcaps = le32_to_cpu(grant->caps);
3294 int used, wanted, dirty;
3295 u64 size = le64_to_cpu(grant->size);
3296 u64 max_size = le64_to_cpu(grant->max_size);
3297 unsigned char check_caps = 0;
3298 bool was_stale = cap->cap_gen < atomic_read(&session->s_cap_gen);
3300 bool writeback = false;
3301 bool queue_trunc = false;
3302 bool queue_invalidate = false;
3303 bool deleted_inode = false;
3304 bool fill_inline = false;
3306 dout("handle_cap_grant inode %p cap %p mds%d seq %d %s\n",
3307 inode, cap, session->s_mds, seq, ceph_cap_string(newcaps));
3308 dout(" size %llu max_size %llu, i_size %llu\n", size, max_size,
3309 i_size_read(inode));
3313 * If CACHE is being revoked, and we have no dirty buffers,
3314 * try to invalidate (once). (If there are dirty buffers, we
3315 * will invalidate _after_ writeback.)
3317 if (S_ISREG(inode->i_mode) && /* don't invalidate readdir cache */
3318 ((cap->issued & ~newcaps) & CEPH_CAP_FILE_CACHE) &&
3319 (newcaps & CEPH_CAP_FILE_LAZYIO) == 0 &&
3320 !(ci->i_wrbuffer_ref || ci->i_wb_ref)) {
3321 if (try_nonblocking_invalidate(inode)) {
3322 /* there were locked pages.. invalidate later
3323 in a separate thread. */
3324 if (ci->i_rdcache_revoking != ci->i_rdcache_gen) {
3325 queue_invalidate = true;
3326 ci->i_rdcache_revoking = ci->i_rdcache_gen;
3332 cap->issued = cap->implemented = CEPH_CAP_PIN;
3335 * auth mds of the inode changed. we received the cap export message,
3336 * but still haven't received the cap import message. handle_cap_export
3337 * updated the new auth MDS' cap.
3339 * "ceph_seq_cmp(seq, cap->seq) <= 0" means we are processing a message
3340 * that was sent before the cap import message. So don't remove caps.
3342 if (ceph_seq_cmp(seq, cap->seq) <= 0) {
3343 WARN_ON(cap != ci->i_auth_cap);
3344 WARN_ON(cap->cap_id != le64_to_cpu(grant->cap_id));
3346 newcaps |= cap->issued;
3349 /* side effects now are allowed */
3350 cap->cap_gen = atomic_read(&session->s_cap_gen);
3353 __check_cap_issue(ci, cap, newcaps);
3355 inode_set_max_iversion_raw(inode, extra_info->change_attr);
3357 if ((newcaps & CEPH_CAP_AUTH_SHARED) &&
3358 (extra_info->issued & CEPH_CAP_AUTH_EXCL) == 0) {
3359 umode_t mode = le32_to_cpu(grant->mode);
3361 if (inode_wrong_type(inode, mode))
3362 pr_warn_once("inode type changed! (ino %llx.%llx is 0%o, mds says 0%o)\n",
3363 ceph_vinop(inode), inode->i_mode, mode);
3365 inode->i_mode = mode;
3366 inode->i_uid = make_kuid(&init_user_ns, le32_to_cpu(grant->uid));
3367 inode->i_gid = make_kgid(&init_user_ns, le32_to_cpu(grant->gid));
3368 ci->i_btime = extra_info->btime;
3369 dout("%p mode 0%o uid.gid %d.%d\n", inode, inode->i_mode,
3370 from_kuid(&init_user_ns, inode->i_uid),
3371 from_kgid(&init_user_ns, inode->i_gid));
3374 if ((newcaps & CEPH_CAP_LINK_SHARED) &&
3375 (extra_info->issued & CEPH_CAP_LINK_EXCL) == 0) {
3376 set_nlink(inode, le32_to_cpu(grant->nlink));
3377 if (inode->i_nlink == 0 &&
3378 (newcaps & (CEPH_CAP_LINK_SHARED | CEPH_CAP_LINK_EXCL)))
3379 deleted_inode = true;
3382 if ((extra_info->issued & CEPH_CAP_XATTR_EXCL) == 0 &&
3384 int len = le32_to_cpu(grant->xattr_len);
3385 u64 version = le64_to_cpu(grant->xattr_version);
3387 if (version > ci->i_xattrs.version) {
3388 dout(" got new xattrs v%llu on %p len %d\n",
3389 version, inode, len);
3390 if (ci->i_xattrs.blob)
3391 ceph_buffer_put(ci->i_xattrs.blob);
3392 ci->i_xattrs.blob = ceph_buffer_get(xattr_buf);
3393 ci->i_xattrs.version = version;
3394 ceph_forget_all_cached_acls(inode);
3395 ceph_security_invalidate_secctx(inode);
3399 if (newcaps & CEPH_CAP_ANY_RD) {
3400 struct timespec64 mtime, atime, ctime;
3401 /* ctime/mtime/atime? */
3402 ceph_decode_timespec64(&mtime, &grant->mtime);
3403 ceph_decode_timespec64(&atime, &grant->atime);
3404 ceph_decode_timespec64(&ctime, &grant->ctime);
3405 ceph_fill_file_time(inode, extra_info->issued,
3406 le32_to_cpu(grant->time_warp_seq),
3407 &ctime, &mtime, &atime);
3410 if ((newcaps & CEPH_CAP_FILE_SHARED) && extra_info->dirstat_valid) {
3411 ci->i_files = extra_info->nfiles;
3412 ci->i_subdirs = extra_info->nsubdirs;
3415 if (newcaps & (CEPH_CAP_ANY_FILE_RD | CEPH_CAP_ANY_FILE_WR)) {
3416 /* file layout may have changed */
3417 s64 old_pool = ci->i_layout.pool_id;
3418 struct ceph_string *old_ns;
3420 ceph_file_layout_from_legacy(&ci->i_layout, &grant->layout);
3421 old_ns = rcu_dereference_protected(ci->i_layout.pool_ns,
3422 lockdep_is_held(&ci->i_ceph_lock));
3423 rcu_assign_pointer(ci->i_layout.pool_ns, extra_info->pool_ns);
3425 if (ci->i_layout.pool_id != old_pool ||
3426 extra_info->pool_ns != old_ns)
3427 ci->i_ceph_flags &= ~CEPH_I_POOL_PERM;
3429 extra_info->pool_ns = old_ns;
3431 /* size/truncate_seq? */
3432 queue_trunc = ceph_fill_file_size(inode, extra_info->issued,
3433 le32_to_cpu(grant->truncate_seq),
3434 le64_to_cpu(grant->truncate_size),
3438 if (ci->i_auth_cap == cap && (newcaps & CEPH_CAP_ANY_FILE_WR)) {
3439 if (max_size != ci->i_max_size) {
3440 dout("max_size %lld -> %llu\n",
3441 ci->i_max_size, max_size);
3442 ci->i_max_size = max_size;
3443 if (max_size >= ci->i_wanted_max_size) {
3444 ci->i_wanted_max_size = 0; /* reset */
3445 ci->i_requested_max_size = 0;
3451 /* check cap bits */
3452 wanted = __ceph_caps_wanted(ci);
3453 used = __ceph_caps_used(ci);
3454 dirty = __ceph_caps_dirty(ci);
3455 dout(" my wanted = %s, used = %s, dirty %s\n",
3456 ceph_cap_string(wanted),
3457 ceph_cap_string(used),
3458 ceph_cap_string(dirty));
3460 if ((was_stale || le32_to_cpu(grant->op) == CEPH_CAP_OP_IMPORT) &&
3461 (wanted & ~(cap->mds_wanted | newcaps))) {
3463 * If mds is importing cap, prior cap messages that update
3464 * 'wanted' may get dropped by mds (migrate seq mismatch).
3466 * We don't send cap message to update 'wanted' if what we
3467 * want are already issued. If mds revokes caps, cap message
3468 * that releases caps also tells mds what we want. But if
3469 * caps got revoked by mds forcedly (session stale). We may
3470 * haven't told mds what we want.
3475 /* revocation, grant, or no-op? */
3476 if (cap->issued & ~newcaps) {
3477 int revoking = cap->issued & ~newcaps;
3479 dout("revocation: %s -> %s (revoking %s)\n",
3480 ceph_cap_string(cap->issued),
3481 ceph_cap_string(newcaps),
3482 ceph_cap_string(revoking));
3483 if (S_ISREG(inode->i_mode) &&
3484 (revoking & used & CEPH_CAP_FILE_BUFFER))
3485 writeback = true; /* initiate writeback; will delay ack */
3486 else if (queue_invalidate &&
3487 revoking == CEPH_CAP_FILE_CACHE &&
3488 (newcaps & CEPH_CAP_FILE_LAZYIO) == 0)
3489 ; /* do nothing yet, invalidation will be queued */
3490 else if (cap == ci->i_auth_cap)
3491 check_caps = 1; /* check auth cap only */
3493 check_caps = 2; /* check all caps */
3494 cap->issued = newcaps;
3495 cap->implemented |= newcaps;
3496 } else if (cap->issued == newcaps) {
3497 dout("caps unchanged: %s -> %s\n",
3498 ceph_cap_string(cap->issued), ceph_cap_string(newcaps));
3500 dout("grant: %s -> %s\n", ceph_cap_string(cap->issued),
3501 ceph_cap_string(newcaps));
3502 /* non-auth MDS is revoking the newly grant caps ? */
3503 if (cap == ci->i_auth_cap &&
3504 __ceph_caps_revoking_other(ci, cap, newcaps))
3507 cap->issued = newcaps;
3508 cap->implemented |= newcaps; /* add bits only, to
3509 * avoid stepping on a
3510 * pending revocation */
3513 BUG_ON(cap->issued & ~cap->implemented);
3515 if (extra_info->inline_version > 0 &&
3516 extra_info->inline_version >= ci->i_inline_version) {
3517 ci->i_inline_version = extra_info->inline_version;
3518 if (ci->i_inline_version != CEPH_INLINE_NONE &&
3519 (newcaps & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)))
3523 if (ci->i_auth_cap == cap &&
3524 le32_to_cpu(grant->op) == CEPH_CAP_OP_IMPORT) {
3525 if (newcaps & ~extra_info->issued)
3528 if (ci->i_requested_max_size > max_size ||
3529 !(le32_to_cpu(grant->wanted) & CEPH_CAP_ANY_FILE_WR)) {
3530 /* re-request max_size if necessary */
3531 ci->i_requested_max_size = 0;
3535 ceph_kick_flushing_inode_caps(session, ci);
3536 spin_unlock(&ci->i_ceph_lock);
3537 up_read(&session->s_mdsc->snap_rwsem);
3539 spin_unlock(&ci->i_ceph_lock);
3543 ceph_fill_inline_data(inode, NULL, extra_info->inline_data,
3544 extra_info->inline_len);
3547 ceph_queue_vmtruncate(inode);
3551 * queue inode for writeback: we can't actually call
3552 * filemap_write_and_wait, etc. from message handler
3555 ceph_queue_writeback(inode);
3556 if (queue_invalidate)
3557 ceph_queue_invalidate(inode);
3559 invalidate_aliases(inode);
3561 wake_up_all(&ci->i_cap_wq);
3563 mutex_unlock(&session->s_mutex);
3564 if (check_caps == 1)
3565 ceph_check_caps(ci, CHECK_CAPS_AUTHONLY | CHECK_CAPS_NOINVAL,
3567 else if (check_caps == 2)
3568 ceph_check_caps(ci, CHECK_CAPS_NOINVAL, session);
3572 * Handle FLUSH_ACK from MDS, indicating that metadata we sent to the
3573 * MDS has been safely committed.
3575 static void handle_cap_flush_ack(struct inode *inode, u64 flush_tid,
3576 struct ceph_mds_caps *m,
3577 struct ceph_mds_session *session,
3578 struct ceph_cap *cap)
3579 __releases(ci->i_ceph_lock)
3581 struct ceph_inode_info *ci = ceph_inode(inode);
3582 struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
3583 struct ceph_cap_flush *cf, *tmp_cf;
3584 LIST_HEAD(to_remove);
3585 unsigned seq = le32_to_cpu(m->seq);
3586 int dirty = le32_to_cpu(m->dirty);
3589 bool wake_ci = false;
3590 bool wake_mdsc = false;
3592 list_for_each_entry_safe(cf, tmp_cf, &ci->i_cap_flush_list, i_list) {
3593 /* Is this the one that was flushed? */
3594 if (cf->tid == flush_tid)
3597 /* Is this a capsnap? */
3601 if (cf->tid <= flush_tid) {
3603 * An earlier or current tid. The FLUSH_ACK should
3604 * represent a superset of this flush's caps.
3606 wake_ci |= __detach_cap_flush_from_ci(ci, cf);
3607 list_add_tail(&cf->i_list, &to_remove);
3610 * This is a later one. Any caps in it are still dirty
3611 * so don't count them as cleaned.
3613 cleaned &= ~cf->caps;
3619 dout("handle_cap_flush_ack inode %p mds%d seq %d on %s cleaned %s,"
3620 " flushing %s -> %s\n",
3621 inode, session->s_mds, seq, ceph_cap_string(dirty),
3622 ceph_cap_string(cleaned), ceph_cap_string(ci->i_flushing_caps),
3623 ceph_cap_string(ci->i_flushing_caps & ~cleaned));
3625 if (list_empty(&to_remove) && !cleaned)
3628 ci->i_flushing_caps &= ~cleaned;
3630 spin_lock(&mdsc->cap_dirty_lock);
3632 list_for_each_entry(cf, &to_remove, i_list)
3633 wake_mdsc |= __detach_cap_flush_from_mdsc(mdsc, cf);
3635 if (ci->i_flushing_caps == 0) {
3636 if (list_empty(&ci->i_cap_flush_list)) {
3637 list_del_init(&ci->i_flushing_item);
3638 if (!list_empty(&session->s_cap_flushing)) {
3639 dout(" mds%d still flushing cap on %p\n",
3641 &list_first_entry(&session->s_cap_flushing,
3642 struct ceph_inode_info,
3643 i_flushing_item)->vfs_inode);
3646 mdsc->num_cap_flushing--;
3647 dout(" inode %p now !flushing\n", inode);
3649 if (ci->i_dirty_caps == 0) {
3650 dout(" inode %p now clean\n", inode);
3651 BUG_ON(!list_empty(&ci->i_dirty_item));
3653 if (ci->i_wr_ref == 0 &&
3654 ci->i_wrbuffer_ref_head == 0) {
3655 BUG_ON(!ci->i_head_snapc);
3656 ceph_put_snap_context(ci->i_head_snapc);
3657 ci->i_head_snapc = NULL;
3660 BUG_ON(list_empty(&ci->i_dirty_item));
3663 spin_unlock(&mdsc->cap_dirty_lock);
3666 spin_unlock(&ci->i_ceph_lock);
3668 while (!list_empty(&to_remove)) {
3669 cf = list_first_entry(&to_remove,
3670 struct ceph_cap_flush, i_list);
3671 list_del_init(&cf->i_list);
3672 if (!cf->is_capsnap)
3673 ceph_free_cap_flush(cf);
3677 wake_up_all(&ci->i_cap_wq);
3679 wake_up_all(&mdsc->cap_flushing_wq);
3684 void __ceph_remove_capsnap(struct inode *inode, struct ceph_cap_snap *capsnap,
3685 bool *wake_ci, bool *wake_mdsc)
3687 struct ceph_inode_info *ci = ceph_inode(inode);
3688 struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
3691 lockdep_assert_held(&ci->i_ceph_lock);
3693 dout("removing capsnap %p, inode %p ci %p\n", capsnap, inode, ci);
3695 list_del_init(&capsnap->ci_item);
3696 ret = __detach_cap_flush_from_ci(ci, &capsnap->cap_flush);
3700 spin_lock(&mdsc->cap_dirty_lock);
3701 if (list_empty(&ci->i_cap_flush_list))
3702 list_del_init(&ci->i_flushing_item);
3704 ret = __detach_cap_flush_from_mdsc(mdsc, &capsnap->cap_flush);
3707 spin_unlock(&mdsc->cap_dirty_lock);
3710 void ceph_remove_capsnap(struct inode *inode, struct ceph_cap_snap *capsnap,
3711 bool *wake_ci, bool *wake_mdsc)
3713 struct ceph_inode_info *ci = ceph_inode(inode);
3715 lockdep_assert_held(&ci->i_ceph_lock);
3717 WARN_ON_ONCE(capsnap->dirty_pages || capsnap->writing);
3718 __ceph_remove_capsnap(inode, capsnap, wake_ci, wake_mdsc);
3722 * Handle FLUSHSNAP_ACK. MDS has flushed snap data to disk and we can
3723 * throw away our cap_snap.
3725 * Caller hold s_mutex.
3727 static void handle_cap_flushsnap_ack(struct inode *inode, u64 flush_tid,
3728 struct ceph_mds_caps *m,
3729 struct ceph_mds_session *session)
3731 struct ceph_inode_info *ci = ceph_inode(inode);
3732 struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
3733 u64 follows = le64_to_cpu(m->snap_follows);
3734 struct ceph_cap_snap *capsnap;
3735 bool flushed = false;
3736 bool wake_ci = false;
3737 bool wake_mdsc = false;
3739 dout("handle_cap_flushsnap_ack inode %p ci %p mds%d follows %lld\n",
3740 inode, ci, session->s_mds, follows);
3742 spin_lock(&ci->i_ceph_lock);
3743 list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) {
3744 if (capsnap->follows == follows) {
3745 if (capsnap->cap_flush.tid != flush_tid) {
3746 dout(" cap_snap %p follows %lld tid %lld !="
3747 " %lld\n", capsnap, follows,
3748 flush_tid, capsnap->cap_flush.tid);
3754 dout(" skipping cap_snap %p follows %lld\n",
3755 capsnap, capsnap->follows);
3759 ceph_remove_capsnap(inode, capsnap, &wake_ci, &wake_mdsc);
3760 spin_unlock(&ci->i_ceph_lock);
3763 ceph_put_snap_context(capsnap->context);
3764 ceph_put_cap_snap(capsnap);
3766 wake_up_all(&ci->i_cap_wq);
3768 wake_up_all(&mdsc->cap_flushing_wq);
3774 * Handle TRUNC from MDS, indicating file truncation.
3776 * caller hold s_mutex.
3778 static bool handle_cap_trunc(struct inode *inode,
3779 struct ceph_mds_caps *trunc,
3780 struct ceph_mds_session *session)
3782 struct ceph_inode_info *ci = ceph_inode(inode);
3783 int mds = session->s_mds;
3784 int seq = le32_to_cpu(trunc->seq);
3785 u32 truncate_seq = le32_to_cpu(trunc->truncate_seq);
3786 u64 truncate_size = le64_to_cpu(trunc->truncate_size);
3787 u64 size = le64_to_cpu(trunc->size);
3788 int implemented = 0;
3789 int dirty = __ceph_caps_dirty(ci);
3790 int issued = __ceph_caps_issued(ceph_inode(inode), &implemented);
3791 bool queue_trunc = false;
3793 lockdep_assert_held(&ci->i_ceph_lock);
3795 issued |= implemented | dirty;
3797 dout("handle_cap_trunc inode %p mds%d seq %d to %lld seq %d\n",
3798 inode, mds, seq, truncate_size, truncate_seq);
3799 queue_trunc = ceph_fill_file_size(inode, issued,
3800 truncate_seq, truncate_size, size);
3805 * Handle EXPORT from MDS. Cap is being migrated _from_ this mds to a
3806 * different one. If we are the most recent migration we've seen (as
3807 * indicated by mseq), make note of the migrating cap bits for the
3808 * duration (until we see the corresponding IMPORT).
3810 * caller holds s_mutex
3812 static void handle_cap_export(struct inode *inode, struct ceph_mds_caps *ex,
3813 struct ceph_mds_cap_peer *ph,
3814 struct ceph_mds_session *session)
3816 struct ceph_mds_client *mdsc = ceph_inode_to_client(inode)->mdsc;
3817 struct ceph_mds_session *tsession = NULL;
3818 struct ceph_cap *cap, *tcap, *new_cap = NULL;
3819 struct ceph_inode_info *ci = ceph_inode(inode);
3821 unsigned mseq = le32_to_cpu(ex->migrate_seq);
3822 unsigned t_seq, t_mseq;
3824 int mds = session->s_mds;
3827 t_cap_id = le64_to_cpu(ph->cap_id);
3828 t_seq = le32_to_cpu(ph->seq);
3829 t_mseq = le32_to_cpu(ph->mseq);
3830 target = le32_to_cpu(ph->mds);
3832 t_cap_id = t_seq = t_mseq = 0;
3836 dout("handle_cap_export inode %p ci %p mds%d mseq %d target %d\n",
3837 inode, ci, mds, mseq, target);
3839 spin_lock(&ci->i_ceph_lock);
3840 cap = __get_cap_for_mds(ci, mds);
3841 if (!cap || cap->cap_id != le64_to_cpu(ex->cap_id))
3845 ceph_remove_cap(cap, false);
3850 * now we know we haven't received the cap import message yet
3851 * because the exported cap still exist.
3854 issued = cap->issued;
3855 if (issued != cap->implemented)
3856 pr_err_ratelimited("handle_cap_export: issued != implemented: "
3857 "ino (%llx.%llx) mds%d seq %d mseq %d "
3858 "issued %s implemented %s\n",
3859 ceph_vinop(inode), mds, cap->seq, cap->mseq,
3860 ceph_cap_string(issued),
3861 ceph_cap_string(cap->implemented));
3864 tcap = __get_cap_for_mds(ci, target);
3866 /* already have caps from the target */
3867 if (tcap->cap_id == t_cap_id &&
3868 ceph_seq_cmp(tcap->seq, t_seq) < 0) {
3869 dout(" updating import cap %p mds%d\n", tcap, target);
3870 tcap->cap_id = t_cap_id;
3871 tcap->seq = t_seq - 1;
3872 tcap->issue_seq = t_seq - 1;
3873 tcap->issued |= issued;
3874 tcap->implemented |= issued;
3875 if (cap == ci->i_auth_cap) {
3876 ci->i_auth_cap = tcap;
3877 change_auth_cap_ses(ci, tcap->session);
3880 ceph_remove_cap(cap, false);
3882 } else if (tsession) {
3883 /* add placeholder for the export tagert */
3884 int flag = (cap == ci->i_auth_cap) ? CEPH_CAP_FLAG_AUTH : 0;
3886 ceph_add_cap(inode, tsession, t_cap_id, issued, 0,
3887 t_seq - 1, t_mseq, (u64)-1, flag, &new_cap);
3889 if (!list_empty(&ci->i_cap_flush_list) &&
3890 ci->i_auth_cap == tcap) {
3891 spin_lock(&mdsc->cap_dirty_lock);
3892 list_move_tail(&ci->i_flushing_item,
3893 &tcap->session->s_cap_flushing);
3894 spin_unlock(&mdsc->cap_dirty_lock);
3897 ceph_remove_cap(cap, false);
3901 spin_unlock(&ci->i_ceph_lock);
3902 mutex_unlock(&session->s_mutex);
3904 /* open target session */
3905 tsession = ceph_mdsc_open_export_target_session(mdsc, target);
3906 if (!IS_ERR(tsession)) {
3908 mutex_lock(&session->s_mutex);
3909 mutex_lock_nested(&tsession->s_mutex,
3910 SINGLE_DEPTH_NESTING);
3912 mutex_lock(&tsession->s_mutex);
3913 mutex_lock_nested(&session->s_mutex,
3914 SINGLE_DEPTH_NESTING);
3916 new_cap = ceph_get_cap(mdsc, NULL);
3921 mutex_lock(&session->s_mutex);
3926 spin_unlock(&ci->i_ceph_lock);
3927 mutex_unlock(&session->s_mutex);
3929 mutex_unlock(&tsession->s_mutex);
3930 ceph_put_mds_session(tsession);
3933 ceph_put_cap(mdsc, new_cap);
3937 * Handle cap IMPORT.
3939 * caller holds s_mutex. acquires i_ceph_lock
3941 static void handle_cap_import(struct ceph_mds_client *mdsc,
3942 struct inode *inode, struct ceph_mds_caps *im,
3943 struct ceph_mds_cap_peer *ph,
3944 struct ceph_mds_session *session,
3945 struct ceph_cap **target_cap, int *old_issued)
3947 struct ceph_inode_info *ci = ceph_inode(inode);
3948 struct ceph_cap *cap, *ocap, *new_cap = NULL;
3949 int mds = session->s_mds;
3951 unsigned caps = le32_to_cpu(im->caps);
3952 unsigned wanted = le32_to_cpu(im->wanted);
3953 unsigned seq = le32_to_cpu(im->seq);
3954 unsigned mseq = le32_to_cpu(im->migrate_seq);
3955 u64 realmino = le64_to_cpu(im->realm);
3956 u64 cap_id = le64_to_cpu(im->cap_id);
3961 p_cap_id = le64_to_cpu(ph->cap_id);
3962 peer = le32_to_cpu(ph->mds);
3968 dout("handle_cap_import inode %p ci %p mds%d mseq %d peer %d\n",
3969 inode, ci, mds, mseq, peer);
3971 cap = __get_cap_for_mds(ci, mds);
3974 spin_unlock(&ci->i_ceph_lock);
3975 new_cap = ceph_get_cap(mdsc, NULL);
3976 spin_lock(&ci->i_ceph_lock);
3982 ceph_put_cap(mdsc, new_cap);
3987 __ceph_caps_issued(ci, &issued);
3988 issued |= __ceph_caps_dirty(ci);
3990 ceph_add_cap(inode, session, cap_id, caps, wanted, seq, mseq,
3991 realmino, CEPH_CAP_FLAG_AUTH, &new_cap);
3993 ocap = peer >= 0 ? __get_cap_for_mds(ci, peer) : NULL;
3994 if (ocap && ocap->cap_id == p_cap_id) {
3995 dout(" remove export cap %p mds%d flags %d\n",
3996 ocap, peer, ph->flags);
3997 if ((ph->flags & CEPH_CAP_FLAG_AUTH) &&
3998 (ocap->seq != le32_to_cpu(ph->seq) ||
3999 ocap->mseq != le32_to_cpu(ph->mseq))) {
4000 pr_err_ratelimited("handle_cap_import: "
4001 "mismatched seq/mseq: ino (%llx.%llx) "
4002 "mds%d seq %d mseq %d importer mds%d "
4003 "has peer seq %d mseq %d\n",
4004 ceph_vinop(inode), peer, ocap->seq,
4005 ocap->mseq, mds, le32_to_cpu(ph->seq),
4006 le32_to_cpu(ph->mseq));
4008 ceph_remove_cap(ocap, (ph->flags & CEPH_CAP_FLAG_RELEASE));
4011 *old_issued = issued;
4016 * Handle a caps message from the MDS.
4018 * Identify the appropriate session, inode, and call the right handler
4019 * based on the cap op.
4021 void ceph_handle_caps(struct ceph_mds_session *session,
4022 struct ceph_msg *msg)
4024 struct ceph_mds_client *mdsc = session->s_mdsc;
4025 struct inode *inode;
4026 struct ceph_inode_info *ci;
4027 struct ceph_cap *cap;
4028 struct ceph_mds_caps *h;
4029 struct ceph_mds_cap_peer *peer = NULL;
4030 struct ceph_snap_realm *realm = NULL;
4032 int msg_version = le16_to_cpu(msg->hdr.version);
4034 struct ceph_vino vino;
4036 size_t snaptrace_len;
4038 struct cap_extra_info extra_info = {};
4041 dout("handle_caps from mds%d\n", session->s_mds);
4044 end = msg->front.iov_base + msg->front.iov_len;
4045 if (msg->front.iov_len < sizeof(*h))
4047 h = msg->front.iov_base;
4048 op = le32_to_cpu(h->op);
4049 vino.ino = le64_to_cpu(h->ino);
4050 vino.snap = CEPH_NOSNAP;
4051 seq = le32_to_cpu(h->seq);
4052 mseq = le32_to_cpu(h->migrate_seq);
4055 snaptrace_len = le32_to_cpu(h->snap_trace_len);
4056 p = snaptrace + snaptrace_len;
4058 if (msg_version >= 2) {
4060 ceph_decode_32_safe(&p, end, flock_len, bad);
4061 if (p + flock_len > end)
4066 if (msg_version >= 3) {
4067 if (op == CEPH_CAP_OP_IMPORT) {
4068 if (p + sizeof(*peer) > end)
4072 } else if (op == CEPH_CAP_OP_EXPORT) {
4073 /* recorded in unused fields */
4074 peer = (void *)&h->size;
4078 if (msg_version >= 4) {
4079 ceph_decode_64_safe(&p, end, extra_info.inline_version, bad);
4080 ceph_decode_32_safe(&p, end, extra_info.inline_len, bad);
4081 if (p + extra_info.inline_len > end)
4083 extra_info.inline_data = p;
4084 p += extra_info.inline_len;
4087 if (msg_version >= 5) {
4088 struct ceph_osd_client *osdc = &mdsc->fsc->client->osdc;
4091 ceph_decode_32_safe(&p, end, epoch_barrier, bad);
4092 ceph_osdc_update_epoch_barrier(osdc, epoch_barrier);
4095 if (msg_version >= 8) {
4099 ceph_decode_skip_64(&p, end, bad); // flush_tid
4101 ceph_decode_skip_32(&p, end, bad); // caller_uid
4102 ceph_decode_skip_32(&p, end, bad); // caller_gid
4104 ceph_decode_32_safe(&p, end, pool_ns_len, bad);
4105 if (pool_ns_len > 0) {
4106 ceph_decode_need(&p, end, pool_ns_len, bad);
4107 extra_info.pool_ns =
4108 ceph_find_or_create_string(p, pool_ns_len);
4113 if (msg_version >= 9) {
4114 struct ceph_timespec *btime;
4116 if (p + sizeof(*btime) > end)
4119 ceph_decode_timespec64(&extra_info.btime, btime);
4120 p += sizeof(*btime);
4121 ceph_decode_64_safe(&p, end, extra_info.change_attr, bad);
4124 if (msg_version >= 11) {
4126 ceph_decode_skip_32(&p, end, bad); // flags
4128 extra_info.dirstat_valid = true;
4129 ceph_decode_64_safe(&p, end, extra_info.nfiles, bad);
4130 ceph_decode_64_safe(&p, end, extra_info.nsubdirs, bad);
4134 inode = ceph_find_inode(mdsc->fsc->sb, vino);
4135 ci = ceph_inode(inode);
4136 dout(" op %s ino %llx.%llx inode %p\n", ceph_cap_op_name(op), vino.ino,
4139 mutex_lock(&session->s_mutex);
4140 inc_session_sequence(session);
4141 dout(" mds%d seq %lld cap seq %u\n", session->s_mds, session->s_seq,
4145 dout(" i don't have ino %llx\n", vino.ino);
4147 if (op == CEPH_CAP_OP_IMPORT) {
4148 cap = ceph_get_cap(mdsc, NULL);
4149 cap->cap_ino = vino.ino;
4150 cap->queue_release = 1;
4151 cap->cap_id = le64_to_cpu(h->cap_id);
4154 cap->issue_seq = seq;
4155 spin_lock(&session->s_cap_lock);
4156 __ceph_queue_cap_release(session, cap);
4157 spin_unlock(&session->s_cap_lock);
4159 goto flush_cap_releases;
4162 /* these will work even if we don't have a cap yet */
4164 case CEPH_CAP_OP_FLUSHSNAP_ACK:
4165 handle_cap_flushsnap_ack(inode, le64_to_cpu(msg->hdr.tid),
4169 case CEPH_CAP_OP_EXPORT:
4170 handle_cap_export(inode, h, peer, session);
4173 case CEPH_CAP_OP_IMPORT:
4175 if (snaptrace_len) {
4176 down_write(&mdsc->snap_rwsem);
4177 ceph_update_snap_trace(mdsc, snaptrace,
4178 snaptrace + snaptrace_len,
4180 downgrade_write(&mdsc->snap_rwsem);
4182 down_read(&mdsc->snap_rwsem);
4184 spin_lock(&ci->i_ceph_lock);
4185 handle_cap_import(mdsc, inode, h, peer, session,
4186 &cap, &extra_info.issued);
4187 handle_cap_grant(inode, session, cap,
4188 h, msg->middle, &extra_info);
4190 ceph_put_snap_realm(mdsc, realm);
4194 /* the rest require a cap */
4195 spin_lock(&ci->i_ceph_lock);
4196 cap = __get_cap_for_mds(ceph_inode(inode), session->s_mds);
4198 dout(" no cap on %p ino %llx.%llx from mds%d\n",
4199 inode, ceph_ino(inode), ceph_snap(inode),
4201 spin_unlock(&ci->i_ceph_lock);
4202 goto flush_cap_releases;
4205 /* note that each of these drops i_ceph_lock for us */
4207 case CEPH_CAP_OP_REVOKE:
4208 case CEPH_CAP_OP_GRANT:
4209 __ceph_caps_issued(ci, &extra_info.issued);
4210 extra_info.issued |= __ceph_caps_dirty(ci);
4211 handle_cap_grant(inode, session, cap,
4212 h, msg->middle, &extra_info);
4215 case CEPH_CAP_OP_FLUSH_ACK:
4216 handle_cap_flush_ack(inode, le64_to_cpu(msg->hdr.tid),
4220 case CEPH_CAP_OP_TRUNC:
4221 queue_trunc = handle_cap_trunc(inode, h, session);
4222 spin_unlock(&ci->i_ceph_lock);
4224 ceph_queue_vmtruncate(inode);
4228 spin_unlock(&ci->i_ceph_lock);
4229 pr_err("ceph_handle_caps: unknown cap op %d %s\n", op,
4230 ceph_cap_op_name(op));
4234 mutex_unlock(&session->s_mutex);
4238 ceph_put_string(extra_info.pool_ns);
4243 * send any cap release message to try to move things
4244 * along for the mds (who clearly thinks we still have this
4247 ceph_flush_cap_releases(mdsc, session);
4251 pr_err("ceph_handle_caps: corrupt message\n");
4257 * Delayed work handler to process end of delayed cap release LRU list.
4259 * If new caps are added to the list while processing it, these won't get
4260 * processed in this run. In this case, the ci->i_hold_caps_max will be
4261 * returned so that the work can be scheduled accordingly.
4263 unsigned long ceph_check_delayed_caps(struct ceph_mds_client *mdsc)
4265 struct inode *inode;
4266 struct ceph_inode_info *ci;
4267 struct ceph_mount_options *opt = mdsc->fsc->mount_options;
4268 unsigned long delay_max = opt->caps_wanted_delay_max * HZ;
4269 unsigned long loop_start = jiffies;
4270 unsigned long delay = 0;
4272 dout("check_delayed_caps\n");
4273 spin_lock(&mdsc->cap_delay_lock);
4274 while (!list_empty(&mdsc->cap_delay_list)) {
4275 ci = list_first_entry(&mdsc->cap_delay_list,
4276 struct ceph_inode_info,
4278 if (time_before(loop_start, ci->i_hold_caps_max - delay_max)) {
4279 dout("%s caps added recently. Exiting loop", __func__);
4280 delay = ci->i_hold_caps_max;
4283 if ((ci->i_ceph_flags & CEPH_I_FLUSH) == 0 &&
4284 time_before(jiffies, ci->i_hold_caps_max))
4286 list_del_init(&ci->i_cap_delay_list);
4288 inode = igrab(&ci->vfs_inode);
4290 spin_unlock(&mdsc->cap_delay_lock);
4291 dout("check_delayed_caps on %p\n", inode);
4292 ceph_check_caps(ci, 0, NULL);
4294 spin_lock(&mdsc->cap_delay_lock);
4297 spin_unlock(&mdsc->cap_delay_lock);
4303 * Flush all dirty caps to the mds
4305 static void flush_dirty_session_caps(struct ceph_mds_session *s)
4307 struct ceph_mds_client *mdsc = s->s_mdsc;
4308 struct ceph_inode_info *ci;
4309 struct inode *inode;
4311 dout("flush_dirty_caps\n");
4312 spin_lock(&mdsc->cap_dirty_lock);
4313 while (!list_empty(&s->s_cap_dirty)) {
4314 ci = list_first_entry(&s->s_cap_dirty, struct ceph_inode_info,
4316 inode = &ci->vfs_inode;
4318 dout("flush_dirty_caps %p\n", inode);
4319 spin_unlock(&mdsc->cap_dirty_lock);
4320 ceph_check_caps(ci, CHECK_CAPS_FLUSH, NULL);
4322 spin_lock(&mdsc->cap_dirty_lock);
4324 spin_unlock(&mdsc->cap_dirty_lock);
4325 dout("flush_dirty_caps done\n");
4328 void ceph_flush_dirty_caps(struct ceph_mds_client *mdsc)
4330 ceph_mdsc_iterate_sessions(mdsc, flush_dirty_session_caps, true);
4333 void __ceph_touch_fmode(struct ceph_inode_info *ci,
4334 struct ceph_mds_client *mdsc, int fmode)
4336 unsigned long now = jiffies;
4337 if (fmode & CEPH_FILE_MODE_RD)
4338 ci->i_last_rd = now;
4339 if (fmode & CEPH_FILE_MODE_WR)
4340 ci->i_last_wr = now;
4341 /* queue periodic check */
4343 __ceph_is_any_real_caps(ci) &&
4344 list_empty(&ci->i_cap_delay_list))
4345 __cap_delay_requeue(mdsc, ci);
4348 void ceph_get_fmode(struct ceph_inode_info *ci, int fmode, int count)
4350 struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(ci->vfs_inode.i_sb);
4351 int bits = (fmode << 1) | 1;
4352 bool is_opened = false;
4356 atomic64_inc(&mdsc->metric.opened_files);
4358 spin_lock(&ci->i_ceph_lock);
4359 for (i = 0; i < CEPH_FILE_MODE_BITS; i++) {
4360 if (bits & (1 << i))
4361 ci->i_nr_by_mode[i] += count;
4364 * If any of the mode ref is larger than 1,
4365 * that means it has been already opened by
4366 * others. Just skip checking the PIN ref.
4368 if (i && ci->i_nr_by_mode[i] > 1)
4373 percpu_counter_inc(&mdsc->metric.opened_inodes);
4374 spin_unlock(&ci->i_ceph_lock);
4378 * Drop open file reference. If we were the last open file,
4379 * we may need to release capabilities to the MDS (or schedule
4380 * their delayed release).
4382 void ceph_put_fmode(struct ceph_inode_info *ci, int fmode, int count)
4384 struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(ci->vfs_inode.i_sb);
4385 int bits = (fmode << 1) | 1;
4386 bool is_closed = true;
4390 atomic64_dec(&mdsc->metric.opened_files);
4392 spin_lock(&ci->i_ceph_lock);
4393 for (i = 0; i < CEPH_FILE_MODE_BITS; i++) {
4394 if (bits & (1 << i)) {
4395 BUG_ON(ci->i_nr_by_mode[i] < count);
4396 ci->i_nr_by_mode[i] -= count;
4400 * If any of the mode ref is not 0 after
4401 * decreased, that means it is still opened
4402 * by others. Just skip checking the PIN ref.
4404 if (i && ci->i_nr_by_mode[i])
4409 percpu_counter_dec(&mdsc->metric.opened_inodes);
4410 spin_unlock(&ci->i_ceph_lock);
4414 * For a soon-to-be unlinked file, drop the LINK caps. If it
4415 * looks like the link count will hit 0, drop any other caps (other
4416 * than PIN) we don't specifically want (due to the file still being
4419 int ceph_drop_caps_for_unlink(struct inode *inode)
4421 struct ceph_inode_info *ci = ceph_inode(inode);
4422 int drop = CEPH_CAP_LINK_SHARED | CEPH_CAP_LINK_EXCL;
4424 spin_lock(&ci->i_ceph_lock);
4425 if (inode->i_nlink == 1) {
4426 drop |= ~(__ceph_caps_wanted(ci) | CEPH_CAP_PIN);
4428 if (__ceph_caps_dirty(ci)) {
4429 struct ceph_mds_client *mdsc =
4430 ceph_inode_to_client(inode)->mdsc;
4431 __cap_delay_requeue_front(mdsc, ci);
4434 spin_unlock(&ci->i_ceph_lock);
4439 * Helpers for embedding cap and dentry lease releases into mds
4442 * @force is used by dentry_release (below) to force inclusion of a
4443 * record for the directory inode, even when there aren't any caps to
4446 int ceph_encode_inode_release(void **p, struct inode *inode,
4447 int mds, int drop, int unless, int force)
4449 struct ceph_inode_info *ci = ceph_inode(inode);
4450 struct ceph_cap *cap;
4451 struct ceph_mds_request_release *rel = *p;
4455 spin_lock(&ci->i_ceph_lock);
4456 used = __ceph_caps_used(ci);
4457 dirty = __ceph_caps_dirty(ci);
4459 dout("encode_inode_release %p mds%d used|dirty %s drop %s unless %s\n",
4460 inode, mds, ceph_cap_string(used|dirty), ceph_cap_string(drop),
4461 ceph_cap_string(unless));
4463 /* only drop unused, clean caps */
4464 drop &= ~(used | dirty);
4466 cap = __get_cap_for_mds(ci, mds);
4467 if (cap && __cap_is_valid(cap)) {
4468 unless &= cap->issued;
4470 if (unless & CEPH_CAP_AUTH_EXCL)
4471 drop &= ~CEPH_CAP_AUTH_SHARED;
4472 if (unless & CEPH_CAP_LINK_EXCL)
4473 drop &= ~CEPH_CAP_LINK_SHARED;
4474 if (unless & CEPH_CAP_XATTR_EXCL)
4475 drop &= ~CEPH_CAP_XATTR_SHARED;
4476 if (unless & CEPH_CAP_FILE_EXCL)
4477 drop &= ~CEPH_CAP_FILE_SHARED;
4480 if (force || (cap->issued & drop)) {
4481 if (cap->issued & drop) {
4482 int wanted = __ceph_caps_wanted(ci);
4483 dout("encode_inode_release %p cap %p "
4484 "%s -> %s, wanted %s -> %s\n", inode, cap,
4485 ceph_cap_string(cap->issued),
4486 ceph_cap_string(cap->issued & ~drop),
4487 ceph_cap_string(cap->mds_wanted),
4488 ceph_cap_string(wanted));
4490 cap->issued &= ~drop;
4491 cap->implemented &= ~drop;
4492 cap->mds_wanted = wanted;
4493 if (cap == ci->i_auth_cap &&
4494 !(wanted & CEPH_CAP_ANY_FILE_WR))
4495 ci->i_requested_max_size = 0;
4497 dout("encode_inode_release %p cap %p %s"
4498 " (force)\n", inode, cap,
4499 ceph_cap_string(cap->issued));
4502 rel->ino = cpu_to_le64(ceph_ino(inode));
4503 rel->cap_id = cpu_to_le64(cap->cap_id);
4504 rel->seq = cpu_to_le32(cap->seq);
4505 rel->issue_seq = cpu_to_le32(cap->issue_seq);
4506 rel->mseq = cpu_to_le32(cap->mseq);
4507 rel->caps = cpu_to_le32(cap->implemented);
4508 rel->wanted = cpu_to_le32(cap->mds_wanted);
4514 dout("encode_inode_release %p cap %p %s (noop)\n",
4515 inode, cap, ceph_cap_string(cap->issued));
4518 spin_unlock(&ci->i_ceph_lock);
4522 int ceph_encode_dentry_release(void **p, struct dentry *dentry,
4524 int mds, int drop, int unless)
4526 struct dentry *parent = NULL;
4527 struct ceph_mds_request_release *rel = *p;
4528 struct ceph_dentry_info *di = ceph_dentry(dentry);
4533 * force an record for the directory caps if we have a dentry lease.
4534 * this is racy (can't take i_ceph_lock and d_lock together), but it
4535 * doesn't have to be perfect; the mds will revoke anything we don't
4538 spin_lock(&dentry->d_lock);
4539 if (di->lease_session && di->lease_session->s_mds == mds)
4542 parent = dget(dentry->d_parent);
4543 dir = d_inode(parent);
4545 spin_unlock(&dentry->d_lock);
4547 ret = ceph_encode_inode_release(p, dir, mds, drop, unless, force);
4550 spin_lock(&dentry->d_lock);
4551 if (ret && di->lease_session && di->lease_session->s_mds == mds) {
4552 dout("encode_dentry_release %p mds%d seq %d\n",
4553 dentry, mds, (int)di->lease_seq);
4554 rel->dname_len = cpu_to_le32(dentry->d_name.len);
4555 memcpy(*p, dentry->d_name.name, dentry->d_name.len);
4556 *p += dentry->d_name.len;
4557 rel->dname_seq = cpu_to_le32(di->lease_seq);
4558 __ceph_mdsc_drop_dentry_lease(dentry);
4560 spin_unlock(&dentry->d_lock);