1 #include <linux/ceph/ceph_debug.h>
4 #include <linux/kernel.h>
5 #include <linux/sched.h>
6 #include <linux/slab.h>
7 #include <linux/vmalloc.h>
8 #include <linux/wait.h>
9 #include <linux/writeback.h>
12 #include "mds_client.h"
14 #include <linux/ceph/decode.h>
15 #include <linux/ceph/messenger.h>
18 * Capability management
20 * The Ceph metadata servers control client access to inode metadata
21 * and file data by issuing capabilities, granting clients permission
22 * to read and/or write both inode field and file data to OSDs
23 * (storage nodes). Each capability consists of a set of bits
24 * indicating which operations are allowed.
26 * If the client holds a *_SHARED cap, the client has a coherent value
27 * that can be safely read from the cached inode.
29 * In the case of a *_EXCL (exclusive) or FILE_WR capabilities, the
30 * client is allowed to change inode attributes (e.g., file size,
31 * mtime), note its dirty state in the ceph_cap, and asynchronously
32 * flush that metadata change to the MDS.
34 * In the event of a conflicting operation (perhaps by another
35 * client), the MDS will revoke the conflicting client capabilities.
37 * In order for a client to cache an inode, it must hold a capability
38 * with at least one MDS server. When inodes are released, release
39 * notifications are batched and periodically sent en masse to the MDS
40 * cluster to release server state.
43 static u64 __get_oldest_flush_tid(struct ceph_mds_client *mdsc);
44 static void __kick_flushing_caps(struct ceph_mds_client *mdsc,
45 struct ceph_mds_session *session,
46 struct ceph_inode_info *ci,
47 u64 oldest_flush_tid);
50 * Generate readable cap strings for debugging output.
52 #define MAX_CAP_STR 20
53 static char cap_str[MAX_CAP_STR][40];
54 static DEFINE_SPINLOCK(cap_str_lock);
55 static int last_cap_str;
57 static char *gcap_string(char *s, int c)
59 if (c & CEPH_CAP_GSHARED)
61 if (c & CEPH_CAP_GEXCL)
63 if (c & CEPH_CAP_GCACHE)
69 if (c & CEPH_CAP_GBUFFER)
71 if (c & CEPH_CAP_GLAZYIO)
76 const char *ceph_cap_string(int caps)
82 spin_lock(&cap_str_lock);
84 if (last_cap_str == MAX_CAP_STR)
86 spin_unlock(&cap_str_lock);
90 if (caps & CEPH_CAP_PIN)
93 c = (caps >> CEPH_CAP_SAUTH) & 3;
96 s = gcap_string(s, c);
99 c = (caps >> CEPH_CAP_SLINK) & 3;
102 s = gcap_string(s, c);
105 c = (caps >> CEPH_CAP_SXATTR) & 3;
108 s = gcap_string(s, c);
111 c = caps >> CEPH_CAP_SFILE;
114 s = gcap_string(s, c);
123 void ceph_caps_init(struct ceph_mds_client *mdsc)
125 INIT_LIST_HEAD(&mdsc->caps_list);
126 spin_lock_init(&mdsc->caps_list_lock);
129 void ceph_caps_finalize(struct ceph_mds_client *mdsc)
131 struct ceph_cap *cap;
133 spin_lock(&mdsc->caps_list_lock);
134 while (!list_empty(&mdsc->caps_list)) {
135 cap = list_first_entry(&mdsc->caps_list,
136 struct ceph_cap, caps_item);
137 list_del(&cap->caps_item);
138 kmem_cache_free(ceph_cap_cachep, cap);
140 mdsc->caps_total_count = 0;
141 mdsc->caps_avail_count = 0;
142 mdsc->caps_use_count = 0;
143 mdsc->caps_reserve_count = 0;
144 mdsc->caps_min_count = 0;
145 spin_unlock(&mdsc->caps_list_lock);
148 void ceph_adjust_min_caps(struct ceph_mds_client *mdsc, int delta)
150 spin_lock(&mdsc->caps_list_lock);
151 mdsc->caps_min_count += delta;
152 BUG_ON(mdsc->caps_min_count < 0);
153 spin_unlock(&mdsc->caps_list_lock);
156 void ceph_reserve_caps(struct ceph_mds_client *mdsc,
157 struct ceph_cap_reservation *ctx, int need)
160 struct ceph_cap *cap;
165 dout("reserve caps ctx=%p need=%d\n", ctx, need);
167 /* first reserve any caps that are already allocated */
168 spin_lock(&mdsc->caps_list_lock);
169 if (mdsc->caps_avail_count >= need)
172 have = mdsc->caps_avail_count;
173 mdsc->caps_avail_count -= have;
174 mdsc->caps_reserve_count += have;
175 BUG_ON(mdsc->caps_total_count != mdsc->caps_use_count +
176 mdsc->caps_reserve_count +
177 mdsc->caps_avail_count);
178 spin_unlock(&mdsc->caps_list_lock);
180 for (i = have; i < need; i++) {
181 cap = kmem_cache_alloc(ceph_cap_cachep, GFP_NOFS);
184 list_add(&cap->caps_item, &newcaps);
187 /* we didn't manage to reserve as much as we needed */
188 if (have + alloc != need)
189 pr_warn("reserve caps ctx=%p ENOMEM need=%d got=%d\n",
190 ctx, need, have + alloc);
192 spin_lock(&mdsc->caps_list_lock);
193 mdsc->caps_total_count += alloc;
194 mdsc->caps_reserve_count += alloc;
195 list_splice(&newcaps, &mdsc->caps_list);
197 BUG_ON(mdsc->caps_total_count != mdsc->caps_use_count +
198 mdsc->caps_reserve_count +
199 mdsc->caps_avail_count);
200 spin_unlock(&mdsc->caps_list_lock);
203 dout("reserve caps ctx=%p %d = %d used + %d resv + %d avail\n",
204 ctx, mdsc->caps_total_count, mdsc->caps_use_count,
205 mdsc->caps_reserve_count, mdsc->caps_avail_count);
208 int ceph_unreserve_caps(struct ceph_mds_client *mdsc,
209 struct ceph_cap_reservation *ctx)
211 dout("unreserve caps ctx=%p count=%d\n", ctx, ctx->count);
213 spin_lock(&mdsc->caps_list_lock);
214 BUG_ON(mdsc->caps_reserve_count < ctx->count);
215 mdsc->caps_reserve_count -= ctx->count;
216 mdsc->caps_avail_count += ctx->count;
218 dout("unreserve caps %d = %d used + %d resv + %d avail\n",
219 mdsc->caps_total_count, mdsc->caps_use_count,
220 mdsc->caps_reserve_count, mdsc->caps_avail_count);
221 BUG_ON(mdsc->caps_total_count != mdsc->caps_use_count +
222 mdsc->caps_reserve_count +
223 mdsc->caps_avail_count);
224 spin_unlock(&mdsc->caps_list_lock);
229 struct ceph_cap *ceph_get_cap(struct ceph_mds_client *mdsc,
230 struct ceph_cap_reservation *ctx)
232 struct ceph_cap *cap = NULL;
234 /* temporary, until we do something about cap import/export */
236 cap = kmem_cache_alloc(ceph_cap_cachep, GFP_NOFS);
238 spin_lock(&mdsc->caps_list_lock);
239 mdsc->caps_use_count++;
240 mdsc->caps_total_count++;
241 spin_unlock(&mdsc->caps_list_lock);
246 spin_lock(&mdsc->caps_list_lock);
247 dout("get_cap ctx=%p (%d) %d = %d used + %d resv + %d avail\n",
248 ctx, ctx->count, mdsc->caps_total_count, mdsc->caps_use_count,
249 mdsc->caps_reserve_count, mdsc->caps_avail_count);
251 BUG_ON(ctx->count > mdsc->caps_reserve_count);
252 BUG_ON(list_empty(&mdsc->caps_list));
255 mdsc->caps_reserve_count--;
256 mdsc->caps_use_count++;
258 cap = list_first_entry(&mdsc->caps_list, struct ceph_cap, caps_item);
259 list_del(&cap->caps_item);
261 BUG_ON(mdsc->caps_total_count != mdsc->caps_use_count +
262 mdsc->caps_reserve_count + mdsc->caps_avail_count);
263 spin_unlock(&mdsc->caps_list_lock);
267 void ceph_put_cap(struct ceph_mds_client *mdsc, struct ceph_cap *cap)
269 spin_lock(&mdsc->caps_list_lock);
270 dout("put_cap %p %d = %d used + %d resv + %d avail\n",
271 cap, mdsc->caps_total_count, mdsc->caps_use_count,
272 mdsc->caps_reserve_count, mdsc->caps_avail_count);
273 mdsc->caps_use_count--;
275 * Keep some preallocated caps around (ceph_min_count), to
276 * avoid lots of free/alloc churn.
278 if (mdsc->caps_avail_count >= mdsc->caps_reserve_count +
279 mdsc->caps_min_count) {
280 mdsc->caps_total_count--;
281 kmem_cache_free(ceph_cap_cachep, cap);
283 mdsc->caps_avail_count++;
284 list_add(&cap->caps_item, &mdsc->caps_list);
287 BUG_ON(mdsc->caps_total_count != mdsc->caps_use_count +
288 mdsc->caps_reserve_count + mdsc->caps_avail_count);
289 spin_unlock(&mdsc->caps_list_lock);
292 void ceph_reservation_status(struct ceph_fs_client *fsc,
293 int *total, int *avail, int *used, int *reserved,
296 struct ceph_mds_client *mdsc = fsc->mdsc;
299 *total = mdsc->caps_total_count;
301 *avail = mdsc->caps_avail_count;
303 *used = mdsc->caps_use_count;
305 *reserved = mdsc->caps_reserve_count;
307 *min = mdsc->caps_min_count;
311 * Find ceph_cap for given mds, if any.
313 * Called with i_ceph_lock held.
315 static struct ceph_cap *__get_cap_for_mds(struct ceph_inode_info *ci, int mds)
317 struct ceph_cap *cap;
318 struct rb_node *n = ci->i_caps.rb_node;
321 cap = rb_entry(n, struct ceph_cap, ci_node);
324 else if (mds > cap->mds)
332 struct ceph_cap *ceph_get_cap_for_mds(struct ceph_inode_info *ci, int mds)
334 struct ceph_cap *cap;
336 spin_lock(&ci->i_ceph_lock);
337 cap = __get_cap_for_mds(ci, mds);
338 spin_unlock(&ci->i_ceph_lock);
343 * Return id of any MDS with a cap, preferably FILE_WR|BUFFER|EXCL, else -1.
345 static int __ceph_get_cap_mds(struct ceph_inode_info *ci)
347 struct ceph_cap *cap;
351 /* prefer mds with WR|BUFFER|EXCL caps */
352 for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
353 cap = rb_entry(p, struct ceph_cap, ci_node);
355 if (cap->issued & (CEPH_CAP_FILE_WR |
356 CEPH_CAP_FILE_BUFFER |
363 int ceph_get_cap_mds(struct inode *inode)
365 struct ceph_inode_info *ci = ceph_inode(inode);
367 spin_lock(&ci->i_ceph_lock);
368 mds = __ceph_get_cap_mds(ceph_inode(inode));
369 spin_unlock(&ci->i_ceph_lock);
374 * Called under i_ceph_lock.
376 static void __insert_cap_node(struct ceph_inode_info *ci,
377 struct ceph_cap *new)
379 struct rb_node **p = &ci->i_caps.rb_node;
380 struct rb_node *parent = NULL;
381 struct ceph_cap *cap = NULL;
385 cap = rb_entry(parent, struct ceph_cap, ci_node);
386 if (new->mds < cap->mds)
388 else if (new->mds > cap->mds)
394 rb_link_node(&new->ci_node, parent, p);
395 rb_insert_color(&new->ci_node, &ci->i_caps);
399 * (re)set cap hold timeouts, which control the delayed release
400 * of unused caps back to the MDS. Should be called on cap use.
402 static void __cap_set_timeouts(struct ceph_mds_client *mdsc,
403 struct ceph_inode_info *ci)
405 struct ceph_mount_options *ma = mdsc->fsc->mount_options;
407 ci->i_hold_caps_min = round_jiffies(jiffies +
408 ma->caps_wanted_delay_min * HZ);
409 ci->i_hold_caps_max = round_jiffies(jiffies +
410 ma->caps_wanted_delay_max * HZ);
411 dout("__cap_set_timeouts %p min %lu max %lu\n", &ci->vfs_inode,
412 ci->i_hold_caps_min - jiffies, ci->i_hold_caps_max - jiffies);
416 * (Re)queue cap at the end of the delayed cap release list.
418 * If I_FLUSH is set, leave the inode at the front of the list.
420 * Caller holds i_ceph_lock
421 * -> we take mdsc->cap_delay_lock
423 static void __cap_delay_requeue(struct ceph_mds_client *mdsc,
424 struct ceph_inode_info *ci)
426 __cap_set_timeouts(mdsc, ci);
427 dout("__cap_delay_requeue %p flags %d at %lu\n", &ci->vfs_inode,
428 ci->i_ceph_flags, ci->i_hold_caps_max);
429 if (!mdsc->stopping) {
430 spin_lock(&mdsc->cap_delay_lock);
431 if (!list_empty(&ci->i_cap_delay_list)) {
432 if (ci->i_ceph_flags & CEPH_I_FLUSH)
434 list_del_init(&ci->i_cap_delay_list);
436 list_add_tail(&ci->i_cap_delay_list, &mdsc->cap_delay_list);
438 spin_unlock(&mdsc->cap_delay_lock);
443 * Queue an inode for immediate writeback. Mark inode with I_FLUSH,
444 * indicating we should send a cap message to flush dirty metadata
445 * asap, and move to the front of the delayed cap list.
447 static void __cap_delay_requeue_front(struct ceph_mds_client *mdsc,
448 struct ceph_inode_info *ci)
450 dout("__cap_delay_requeue_front %p\n", &ci->vfs_inode);
451 spin_lock(&mdsc->cap_delay_lock);
452 ci->i_ceph_flags |= CEPH_I_FLUSH;
453 if (!list_empty(&ci->i_cap_delay_list))
454 list_del_init(&ci->i_cap_delay_list);
455 list_add(&ci->i_cap_delay_list, &mdsc->cap_delay_list);
456 spin_unlock(&mdsc->cap_delay_lock);
460 * Cancel delayed work on cap.
462 * Caller must hold i_ceph_lock.
464 static void __cap_delay_cancel(struct ceph_mds_client *mdsc,
465 struct ceph_inode_info *ci)
467 dout("__cap_delay_cancel %p\n", &ci->vfs_inode);
468 if (list_empty(&ci->i_cap_delay_list))
470 spin_lock(&mdsc->cap_delay_lock);
471 list_del_init(&ci->i_cap_delay_list);
472 spin_unlock(&mdsc->cap_delay_lock);
476 * Common issue checks for add_cap, handle_cap_grant.
478 static void __check_cap_issue(struct ceph_inode_info *ci, struct ceph_cap *cap,
481 unsigned had = __ceph_caps_issued(ci, NULL);
484 * Each time we receive FILE_CACHE anew, we increment
487 if ((issued & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) &&
488 (had & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) == 0) {
493 * if we are newly issued FILE_SHARED, mark dir not complete; we
494 * don't know what happened to this directory while we didn't
497 if ((issued & CEPH_CAP_FILE_SHARED) &&
498 (had & CEPH_CAP_FILE_SHARED) == 0) {
500 if (S_ISDIR(ci->vfs_inode.i_mode)) {
501 dout(" marking %p NOT complete\n", &ci->vfs_inode);
502 __ceph_dir_clear_complete(ci);
508 * Add a capability under the given MDS session.
510 * Caller should hold session snap_rwsem (read) and s_mutex.
512 * @fmode is the open file mode, if we are opening a file, otherwise
513 * it is < 0. (This is so we can atomically add the cap and add an
514 * open file reference to it.)
516 void ceph_add_cap(struct inode *inode,
517 struct ceph_mds_session *session, u64 cap_id,
518 int fmode, unsigned issued, unsigned wanted,
519 unsigned seq, unsigned mseq, u64 realmino, int flags,
520 struct ceph_cap **new_cap)
522 struct ceph_mds_client *mdsc = ceph_inode_to_client(inode)->mdsc;
523 struct ceph_inode_info *ci = ceph_inode(inode);
524 struct ceph_cap *cap;
525 int mds = session->s_mds;
528 dout("add_cap %p mds%d cap %llx %s seq %d\n", inode,
529 session->s_mds, cap_id, ceph_cap_string(issued), seq);
532 * If we are opening the file, include file mode wanted bits
536 wanted |= ceph_caps_for_mode(fmode);
538 cap = __get_cap_for_mds(ci, mds);
544 cap->implemented = 0;
550 __insert_cap_node(ci, cap);
552 /* add to session cap list */
553 cap->session = session;
554 spin_lock(&session->s_cap_lock);
555 list_add_tail(&cap->session_caps, &session->s_caps);
556 session->s_nr_caps++;
557 spin_unlock(&session->s_cap_lock);
560 * auth mds of the inode changed. we received the cap export
561 * message, but still haven't received the cap import message.
562 * handle_cap_export() updated the new auth MDS' cap.
564 * "ceph_seq_cmp(seq, cap->seq) <= 0" means we are processing
565 * a message that was send before the cap import message. So
568 if (ceph_seq_cmp(seq, cap->seq) <= 0) {
569 WARN_ON(cap != ci->i_auth_cap);
570 WARN_ON(cap->cap_id != cap_id);
573 issued |= cap->issued;
574 flags |= CEPH_CAP_FLAG_AUTH;
578 if (!ci->i_snap_realm) {
580 * add this inode to the appropriate snap realm
582 struct ceph_snap_realm *realm = ceph_lookup_snap_realm(mdsc,
585 spin_lock(&realm->inodes_with_caps_lock);
586 ci->i_snap_realm = realm;
587 list_add(&ci->i_snap_realm_item,
588 &realm->inodes_with_caps);
589 spin_unlock(&realm->inodes_with_caps_lock);
591 pr_err("ceph_add_cap: couldn't find snap realm %llx\n",
597 __check_cap_issue(ci, cap, issued);
600 * If we are issued caps we don't want, or the mds' wanted
601 * value appears to be off, queue a check so we'll release
602 * later and/or update the mds wanted value.
604 actual_wanted = __ceph_caps_wanted(ci);
605 if ((wanted & ~actual_wanted) ||
606 (issued & ~actual_wanted & CEPH_CAP_ANY_WR)) {
607 dout(" issued %s, mds wanted %s, actual %s, queueing\n",
608 ceph_cap_string(issued), ceph_cap_string(wanted),
609 ceph_cap_string(actual_wanted));
610 __cap_delay_requeue(mdsc, ci);
613 if (flags & CEPH_CAP_FLAG_AUTH) {
614 if (ci->i_auth_cap == NULL ||
615 ceph_seq_cmp(ci->i_auth_cap->mseq, mseq) < 0) {
616 ci->i_auth_cap = cap;
617 cap->mds_wanted = wanted;
620 WARN_ON(ci->i_auth_cap == cap);
623 dout("add_cap inode %p (%llx.%llx) cap %p %s now %s seq %d mds%d\n",
624 inode, ceph_vinop(inode), cap, ceph_cap_string(issued),
625 ceph_cap_string(issued|cap->issued), seq, mds);
626 cap->cap_id = cap_id;
627 cap->issued = issued;
628 cap->implemented |= issued;
629 if (ceph_seq_cmp(mseq, cap->mseq) > 0)
630 cap->mds_wanted = wanted;
632 cap->mds_wanted |= wanted;
634 cap->issue_seq = seq;
636 cap->cap_gen = session->s_cap_gen;
639 __ceph_get_fmode(ci, fmode);
643 * Return true if cap has not timed out and belongs to the current
644 * generation of the MDS session (i.e. has not gone 'stale' due to
645 * us losing touch with the mds).
647 static int __cap_is_valid(struct ceph_cap *cap)
652 spin_lock(&cap->session->s_gen_ttl_lock);
653 gen = cap->session->s_cap_gen;
654 ttl = cap->session->s_cap_ttl;
655 spin_unlock(&cap->session->s_gen_ttl_lock);
657 if (cap->cap_gen < gen || time_after_eq(jiffies, ttl)) {
658 dout("__cap_is_valid %p cap %p issued %s "
659 "but STALE (gen %u vs %u)\n", &cap->ci->vfs_inode,
660 cap, ceph_cap_string(cap->issued), cap->cap_gen, gen);
668 * Return set of valid cap bits issued to us. Note that caps time
669 * out, and may be invalidated in bulk if the client session times out
670 * and session->s_cap_gen is bumped.
672 int __ceph_caps_issued(struct ceph_inode_info *ci, int *implemented)
674 int have = ci->i_snap_caps;
675 struct ceph_cap *cap;
680 for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
681 cap = rb_entry(p, struct ceph_cap, ci_node);
682 if (!__cap_is_valid(cap))
684 dout("__ceph_caps_issued %p cap %p issued %s\n",
685 &ci->vfs_inode, cap, ceph_cap_string(cap->issued));
688 *implemented |= cap->implemented;
691 * exclude caps issued by non-auth MDS, but are been revoking
692 * by the auth MDS. The non-auth MDS should be revoking/exporting
693 * these caps, but the message is delayed.
695 if (ci->i_auth_cap) {
696 cap = ci->i_auth_cap;
697 have &= ~cap->implemented | cap->issued;
703 * Get cap bits issued by caps other than @ocap
705 int __ceph_caps_issued_other(struct ceph_inode_info *ci, struct ceph_cap *ocap)
707 int have = ci->i_snap_caps;
708 struct ceph_cap *cap;
711 for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
712 cap = rb_entry(p, struct ceph_cap, ci_node);
715 if (!__cap_is_valid(cap))
723 * Move a cap to the end of the LRU (oldest caps at list head, newest
726 static void __touch_cap(struct ceph_cap *cap)
728 struct ceph_mds_session *s = cap->session;
730 spin_lock(&s->s_cap_lock);
731 if (s->s_cap_iterator == NULL) {
732 dout("__touch_cap %p cap %p mds%d\n", &cap->ci->vfs_inode, cap,
734 list_move_tail(&cap->session_caps, &s->s_caps);
736 dout("__touch_cap %p cap %p mds%d NOP, iterating over caps\n",
737 &cap->ci->vfs_inode, cap, s->s_mds);
739 spin_unlock(&s->s_cap_lock);
743 * Check if we hold the given mask. If so, move the cap(s) to the
744 * front of their respective LRUs. (This is the preferred way for
745 * callers to check for caps they want.)
747 int __ceph_caps_issued_mask(struct ceph_inode_info *ci, int mask, int touch)
749 struct ceph_cap *cap;
751 int have = ci->i_snap_caps;
753 if ((have & mask) == mask) {
754 dout("__ceph_caps_issued_mask %p snap issued %s"
755 " (mask %s)\n", &ci->vfs_inode,
756 ceph_cap_string(have),
757 ceph_cap_string(mask));
761 for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
762 cap = rb_entry(p, struct ceph_cap, ci_node);
763 if (!__cap_is_valid(cap))
765 if ((cap->issued & mask) == mask) {
766 dout("__ceph_caps_issued_mask %p cap %p issued %s"
767 " (mask %s)\n", &ci->vfs_inode, cap,
768 ceph_cap_string(cap->issued),
769 ceph_cap_string(mask));
775 /* does a combination of caps satisfy mask? */
777 if ((have & mask) == mask) {
778 dout("__ceph_caps_issued_mask %p combo issued %s"
779 " (mask %s)\n", &ci->vfs_inode,
780 ceph_cap_string(cap->issued),
781 ceph_cap_string(mask));
785 /* touch this + preceding caps */
787 for (q = rb_first(&ci->i_caps); q != p;
789 cap = rb_entry(q, struct ceph_cap,
791 if (!__cap_is_valid(cap))
804 * Return true if mask caps are currently being revoked by an MDS.
806 int __ceph_caps_revoking_other(struct ceph_inode_info *ci,
807 struct ceph_cap *ocap, int mask)
809 struct ceph_cap *cap;
812 for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
813 cap = rb_entry(p, struct ceph_cap, ci_node);
815 (cap->implemented & ~cap->issued & mask))
821 int ceph_caps_revoking(struct ceph_inode_info *ci, int mask)
823 struct inode *inode = &ci->vfs_inode;
826 spin_lock(&ci->i_ceph_lock);
827 ret = __ceph_caps_revoking_other(ci, NULL, mask);
828 spin_unlock(&ci->i_ceph_lock);
829 dout("ceph_caps_revoking %p %s = %d\n", inode,
830 ceph_cap_string(mask), ret);
834 int __ceph_caps_used(struct ceph_inode_info *ci)
838 used |= CEPH_CAP_PIN;
840 used |= CEPH_CAP_FILE_RD;
841 if (ci->i_rdcache_ref ||
842 (!S_ISDIR(ci->vfs_inode.i_mode) && /* ignore readdir cache */
843 ci->vfs_inode.i_data.nrpages))
844 used |= CEPH_CAP_FILE_CACHE;
846 used |= CEPH_CAP_FILE_WR;
847 if (ci->i_wb_ref || ci->i_wrbuffer_ref)
848 used |= CEPH_CAP_FILE_BUFFER;
853 * wanted, by virtue of open file modes
855 int __ceph_caps_file_wanted(struct ceph_inode_info *ci)
858 for (i = 0; i < CEPH_FILE_MODE_BITS; i++) {
859 if (ci->i_nr_by_mode[i])
864 return ceph_caps_for_mode(bits >> 1);
868 * Return caps we have registered with the MDS(s) as 'wanted'.
870 int __ceph_caps_mds_wanted(struct ceph_inode_info *ci)
872 struct ceph_cap *cap;
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 == ci->i_auth_cap)
881 mds_wanted |= cap->mds_wanted;
883 mds_wanted |= (cap->mds_wanted & ~CEPH_CAP_ANY_FILE_WR);
889 * called under i_ceph_lock
891 static int __ceph_is_any_caps(struct ceph_inode_info *ci)
893 return !RB_EMPTY_ROOT(&ci->i_caps);
896 int ceph_is_any_caps(struct inode *inode)
898 struct ceph_inode_info *ci = ceph_inode(inode);
901 spin_lock(&ci->i_ceph_lock);
902 ret = __ceph_is_any_caps(ci);
903 spin_unlock(&ci->i_ceph_lock);
908 static void drop_inode_snap_realm(struct ceph_inode_info *ci)
910 struct ceph_snap_realm *realm = ci->i_snap_realm;
911 spin_lock(&realm->inodes_with_caps_lock);
912 list_del_init(&ci->i_snap_realm_item);
913 ci->i_snap_realm_counter++;
914 ci->i_snap_realm = NULL;
915 spin_unlock(&realm->inodes_with_caps_lock);
916 ceph_put_snap_realm(ceph_sb_to_client(ci->vfs_inode.i_sb)->mdsc,
921 * Remove a cap. Take steps to deal with a racing iterate_session_caps.
923 * caller should hold i_ceph_lock.
924 * caller will not hold session s_mutex if called from destroy_inode.
926 void __ceph_remove_cap(struct ceph_cap *cap, bool queue_release)
928 struct ceph_mds_session *session = cap->session;
929 struct ceph_inode_info *ci = cap->ci;
930 struct ceph_mds_client *mdsc =
931 ceph_sb_to_client(ci->vfs_inode.i_sb)->mdsc;
934 dout("__ceph_remove_cap %p from %p\n", cap, &ci->vfs_inode);
936 /* remove from session list */
937 spin_lock(&session->s_cap_lock);
938 if (session->s_cap_iterator == cap) {
939 /* not yet, we are iterating over this very cap */
940 dout("__ceph_remove_cap delaying %p removal from session %p\n",
943 list_del_init(&cap->session_caps);
944 session->s_nr_caps--;
948 /* protect backpointer with s_cap_lock: see iterate_session_caps */
952 * s_cap_reconnect is protected by s_cap_lock. no one changes
953 * s_cap_gen while session is in the reconnect state.
956 (!session->s_cap_reconnect || cap->cap_gen == session->s_cap_gen)) {
957 cap->queue_release = 1;
959 list_add_tail(&cap->session_caps,
960 &session->s_cap_releases);
961 session->s_num_cap_releases++;
965 cap->queue_release = 0;
967 cap->cap_ino = ci->i_vino.ino;
969 spin_unlock(&session->s_cap_lock);
971 /* remove from inode list */
972 rb_erase(&cap->ci_node, &ci->i_caps);
973 if (ci->i_auth_cap == cap)
974 ci->i_auth_cap = NULL;
977 ceph_put_cap(mdsc, cap);
979 /* when reconnect denied, we remove session caps forcibly,
980 * i_wr_ref can be non-zero. If there are ongoing write,
983 if (!__ceph_is_any_caps(ci) && ci->i_wr_ref == 0 && ci->i_snap_realm)
984 drop_inode_snap_realm(ci);
986 if (!__ceph_is_any_real_caps(ci))
987 __cap_delay_cancel(mdsc, ci);
991 * Build and send a cap message to the given MDS.
993 * Caller should be holding s_mutex.
995 static int send_cap_msg(struct ceph_mds_session *session,
996 u64 ino, u64 cid, int op,
997 int caps, int wanted, int dirty,
998 u32 seq, u64 flush_tid, u64 oldest_flush_tid,
999 u32 issue_seq, u32 mseq, u64 size, u64 max_size,
1000 struct timespec *mtime, struct timespec *atime,
1001 struct timespec *ctime, u32 time_warp_seq,
1002 kuid_t uid, kgid_t gid, umode_t mode,
1004 struct ceph_buffer *xattrs_buf,
1005 u64 follows, bool inline_data)
1007 struct ceph_mds_caps *fc;
1008 struct ceph_msg *msg;
1012 dout("send_cap_msg %s %llx %llx caps %s wanted %s dirty %s"
1013 " seq %u/%u tid %llu/%llu mseq %u follows %lld size %llu/%llu"
1014 " xattr_ver %llu xattr_len %d\n", ceph_cap_op_name(op),
1015 cid, ino, ceph_cap_string(caps), ceph_cap_string(wanted),
1016 ceph_cap_string(dirty),
1017 seq, issue_seq, flush_tid, oldest_flush_tid,
1018 mseq, follows, size, max_size,
1019 xattr_version, xattrs_buf ? (int)xattrs_buf->vec.iov_len : 0);
1021 /* flock buffer size + inline version + inline data size +
1022 * osd_epoch_barrier + oldest_flush_tid */
1023 extra_len = 4 + 8 + 4 + 4 + 8;
1024 msg = ceph_msg_new(CEPH_MSG_CLIENT_CAPS, sizeof(*fc) + extra_len,
1029 msg->hdr.version = cpu_to_le16(6);
1030 msg->hdr.tid = cpu_to_le64(flush_tid);
1032 fc = msg->front.iov_base;
1033 memset(fc, 0, sizeof(*fc));
1035 fc->cap_id = cpu_to_le64(cid);
1036 fc->op = cpu_to_le32(op);
1037 fc->seq = cpu_to_le32(seq);
1038 fc->issue_seq = cpu_to_le32(issue_seq);
1039 fc->migrate_seq = cpu_to_le32(mseq);
1040 fc->caps = cpu_to_le32(caps);
1041 fc->wanted = cpu_to_le32(wanted);
1042 fc->dirty = cpu_to_le32(dirty);
1043 fc->ino = cpu_to_le64(ino);
1044 fc->snap_follows = cpu_to_le64(follows);
1046 fc->size = cpu_to_le64(size);
1047 fc->max_size = cpu_to_le64(max_size);
1049 ceph_encode_timespec(&fc->mtime, mtime);
1051 ceph_encode_timespec(&fc->atime, atime);
1053 ceph_encode_timespec(&fc->ctime, ctime);
1054 fc->time_warp_seq = cpu_to_le32(time_warp_seq);
1056 fc->uid = cpu_to_le32(from_kuid(&init_user_ns, uid));
1057 fc->gid = cpu_to_le32(from_kgid(&init_user_ns, gid));
1058 fc->mode = cpu_to_le32(mode);
1061 /* flock buffer size */
1062 ceph_encode_32(&p, 0);
1063 /* inline version */
1064 ceph_encode_64(&p, inline_data ? 0 : CEPH_INLINE_NONE);
1065 /* inline data size */
1066 ceph_encode_32(&p, 0);
1067 /* osd_epoch_barrier */
1068 ceph_encode_32(&p, 0);
1069 /* oldest_flush_tid */
1070 ceph_encode_64(&p, oldest_flush_tid);
1072 fc->xattr_version = cpu_to_le64(xattr_version);
1074 msg->middle = ceph_buffer_get(xattrs_buf);
1075 fc->xattr_len = cpu_to_le32(xattrs_buf->vec.iov_len);
1076 msg->hdr.middle_len = cpu_to_le32(xattrs_buf->vec.iov_len);
1079 ceph_con_send(&session->s_con, msg);
1084 * Queue cap releases when an inode is dropped from our cache. Since
1085 * inode is about to be destroyed, there is no need for i_ceph_lock.
1087 void ceph_queue_caps_release(struct inode *inode)
1089 struct ceph_inode_info *ci = ceph_inode(inode);
1092 p = rb_first(&ci->i_caps);
1094 struct ceph_cap *cap = rb_entry(p, struct ceph_cap, ci_node);
1096 __ceph_remove_cap(cap, true);
1101 * Send a cap msg on the given inode. Update our caps state, then
1102 * drop i_ceph_lock and send the message.
1104 * Make note of max_size reported/requested from mds, revoked caps
1105 * that have now been implemented.
1107 * Make half-hearted attempt ot to invalidate page cache if we are
1108 * dropping RDCACHE. Note that this will leave behind locked pages
1109 * that we'll then need to deal with elsewhere.
1111 * Return non-zero if delayed release, or we experienced an error
1112 * such that the caller should requeue + retry later.
1114 * called with i_ceph_lock, then drops it.
1115 * caller should hold snap_rwsem (read), s_mutex.
1117 static int __send_cap(struct ceph_mds_client *mdsc, struct ceph_cap *cap,
1118 int op, int used, int want, int retain, int flushing,
1119 u64 flush_tid, u64 oldest_flush_tid)
1120 __releases(cap->ci->i_ceph_lock)
1122 struct ceph_inode_info *ci = cap->ci;
1123 struct inode *inode = &ci->vfs_inode;
1124 u64 cap_id = cap->cap_id;
1125 int held, revoking, dropping, keep;
1126 u64 follows, size, max_size;
1127 u32 seq, issue_seq, mseq, time_warp_seq;
1128 struct timespec mtime, atime, ctime;
1133 struct ceph_mds_session *session;
1134 u64 xattr_version = 0;
1135 struct ceph_buffer *xattr_blob = NULL;
1140 held = cap->issued | cap->implemented;
1141 revoking = cap->implemented & ~cap->issued;
1142 retain &= ~revoking;
1143 dropping = cap->issued & ~retain;
1145 dout("__send_cap %p cap %p session %p %s -> %s (revoking %s)\n",
1146 inode, cap, cap->session,
1147 ceph_cap_string(held), ceph_cap_string(held & retain),
1148 ceph_cap_string(revoking));
1149 BUG_ON((retain & CEPH_CAP_PIN) == 0);
1151 session = cap->session;
1153 /* don't release wanted unless we've waited a bit. */
1154 if ((ci->i_ceph_flags & CEPH_I_NODELAY) == 0 &&
1155 time_before(jiffies, ci->i_hold_caps_min)) {
1156 dout(" delaying issued %s -> %s, wanted %s -> %s on send\n",
1157 ceph_cap_string(cap->issued),
1158 ceph_cap_string(cap->issued & retain),
1159 ceph_cap_string(cap->mds_wanted),
1160 ceph_cap_string(want));
1161 want |= cap->mds_wanted;
1162 retain |= cap->issued;
1165 ci->i_ceph_flags &= ~(CEPH_I_NODELAY | CEPH_I_FLUSH);
1167 cap->issued &= retain; /* drop bits we don't want */
1168 if (cap->implemented & ~cap->issued) {
1170 * Wake up any waiters on wanted -> needed transition.
1171 * This is due to the weird transition from buffered
1172 * to sync IO... we need to flush dirty pages _before_
1173 * allowing sync writes to avoid reordering.
1177 cap->implemented &= cap->issued | used;
1178 cap->mds_wanted = want;
1180 follows = flushing ? ci->i_head_snapc->seq : 0;
1182 keep = cap->implemented;
1184 issue_seq = cap->issue_seq;
1186 size = inode->i_size;
1187 ci->i_reported_size = size;
1188 max_size = ci->i_wanted_max_size;
1189 ci->i_requested_max_size = max_size;
1190 mtime = inode->i_mtime;
1191 atime = inode->i_atime;
1192 ctime = inode->i_ctime;
1193 time_warp_seq = ci->i_time_warp_seq;
1196 mode = inode->i_mode;
1198 if (flushing & CEPH_CAP_XATTR_EXCL) {
1199 __ceph_build_xattrs_blob(ci);
1200 xattr_blob = ci->i_xattrs.blob;
1201 xattr_version = ci->i_xattrs.version;
1204 inline_data = ci->i_inline_version != CEPH_INLINE_NONE;
1206 spin_unlock(&ci->i_ceph_lock);
1208 ret = send_cap_msg(session, ceph_vino(inode).ino, cap_id,
1209 op, keep, want, flushing, seq,
1210 flush_tid, oldest_flush_tid, issue_seq, mseq,
1211 size, max_size, &mtime, &atime, &ctime, time_warp_seq,
1212 uid, gid, mode, xattr_version, xattr_blob,
1213 follows, inline_data);
1215 dout("error sending cap msg, must requeue %p\n", inode);
1220 wake_up_all(&ci->i_cap_wq);
1225 static inline int __send_flush_snap(struct inode *inode,
1226 struct ceph_mds_session *session,
1227 struct ceph_cap_snap *capsnap,
1228 u32 mseq, u64 oldest_flush_tid)
1230 return send_cap_msg(session, ceph_vino(inode).ino, 0,
1231 CEPH_CAP_OP_FLUSHSNAP, capsnap->issued, 0,
1232 capsnap->dirty, 0, capsnap->cap_flush.tid,
1233 oldest_flush_tid, 0, mseq, capsnap->size, 0,
1234 &capsnap->mtime, &capsnap->atime,
1235 &capsnap->ctime, capsnap->time_warp_seq,
1236 capsnap->uid, capsnap->gid, capsnap->mode,
1237 capsnap->xattr_version, capsnap->xattr_blob,
1238 capsnap->follows, capsnap->inline_data);
1242 * When a snapshot is taken, clients accumulate dirty metadata on
1243 * inodes with capabilities in ceph_cap_snaps to describe the file
1244 * state at the time the snapshot was taken. This must be flushed
1245 * asynchronously back to the MDS once sync writes complete and dirty
1246 * data is written out.
1248 * Called under i_ceph_lock. Takes s_mutex as needed.
1250 void __ceph_flush_snaps(struct ceph_inode_info *ci,
1251 struct ceph_mds_session **psession)
1252 __releases(ci->i_ceph_lock)
1253 __acquires(ci->i_ceph_lock)
1255 struct inode *inode = &ci->vfs_inode;
1257 struct ceph_cap_snap *capsnap;
1259 struct ceph_mds_client *mdsc = ceph_inode_to_client(inode)->mdsc;
1260 struct ceph_mds_session *session = NULL; /* if session != NULL, we hold
1262 u64 oldest_flush_tid;
1263 u64 next_follows = 0; /* keep track of how far we've gotten through the
1264 i_cap_snaps list, and skip these entries next time
1265 around to avoid an infinite loop */
1268 session = *psession;
1270 dout("__flush_snaps %p\n", inode);
1272 list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) {
1273 /* avoid an infiniute loop after retry */
1274 if (capsnap->follows < next_follows)
1277 * we need to wait for sync writes to complete and for dirty
1278 * pages to be written out.
1280 if (capsnap->dirty_pages || capsnap->writing)
1283 /* should be removed by ceph_try_drop_cap_snap() */
1284 BUG_ON(!capsnap->need_flush);
1286 /* pick mds, take s_mutex */
1287 if (ci->i_auth_cap == NULL) {
1288 dout("no auth cap (migrating?), doing nothing\n");
1292 /* only flush each capsnap once */
1293 if (capsnap->cap_flush.tid > 0) {
1294 dout("already flushed %p, skipping\n", capsnap);
1298 mds = ci->i_auth_cap->session->s_mds;
1299 mseq = ci->i_auth_cap->mseq;
1301 if (session && session->s_mds != mds) {
1302 dout("oops, wrong session %p mutex\n", session);
1304 mutex_unlock(&session->s_mutex);
1305 ceph_put_mds_session(session);
1309 spin_unlock(&ci->i_ceph_lock);
1310 mutex_lock(&mdsc->mutex);
1311 session = __ceph_lookup_mds_session(mdsc, mds);
1312 mutex_unlock(&mdsc->mutex);
1314 dout("inverting session/ino locks on %p\n",
1316 mutex_lock(&session->s_mutex);
1319 * if session == NULL, we raced against a cap
1320 * deletion or migration. retry, and we'll
1321 * get a better @mds value next time.
1323 spin_lock(&ci->i_ceph_lock);
1327 spin_lock(&mdsc->cap_dirty_lock);
1328 capsnap->cap_flush.tid = ++mdsc->last_cap_flush_tid;
1329 list_add_tail(&capsnap->cap_flush.g_list,
1330 &mdsc->cap_flush_list);
1331 oldest_flush_tid = __get_oldest_flush_tid(mdsc);
1333 if (list_empty(&ci->i_flushing_item)) {
1334 list_add_tail(&ci->i_flushing_item,
1335 &session->s_cap_flushing);
1337 spin_unlock(&mdsc->cap_dirty_lock);
1339 list_add_tail(&capsnap->cap_flush.i_list,
1340 &ci->i_cap_flush_list);
1342 atomic_inc(&capsnap->nref);
1343 spin_unlock(&ci->i_ceph_lock);
1345 dout("flush_snaps %p cap_snap %p follows %lld tid %llu\n",
1346 inode, capsnap, capsnap->follows, capsnap->cap_flush.tid);
1347 __send_flush_snap(inode, session, capsnap, mseq,
1350 next_follows = capsnap->follows + 1;
1351 ceph_put_cap_snap(capsnap);
1353 spin_lock(&ci->i_ceph_lock);
1357 /* we flushed them all; remove this inode from the queue */
1358 spin_lock(&mdsc->snap_flush_lock);
1359 list_del_init(&ci->i_snap_flush_item);
1360 spin_unlock(&mdsc->snap_flush_lock);
1364 *psession = session;
1366 mutex_unlock(&session->s_mutex);
1367 ceph_put_mds_session(session);
1371 static void ceph_flush_snaps(struct ceph_inode_info *ci)
1373 spin_lock(&ci->i_ceph_lock);
1374 __ceph_flush_snaps(ci, NULL);
1375 ci->i_ceph_flags &= ~CEPH_I_FLUSH_SNAPS;
1376 spin_unlock(&ci->i_ceph_lock);
1380 * Mark caps dirty. If inode is newly dirty, return the dirty flags.
1381 * Caller is then responsible for calling __mark_inode_dirty with the
1382 * returned flags value.
1384 int __ceph_mark_dirty_caps(struct ceph_inode_info *ci, int mask,
1385 struct ceph_cap_flush **pcf)
1387 struct ceph_mds_client *mdsc =
1388 ceph_sb_to_client(ci->vfs_inode.i_sb)->mdsc;
1389 struct inode *inode = &ci->vfs_inode;
1390 int was = ci->i_dirty_caps;
1393 if (!ci->i_auth_cap) {
1394 pr_warn("__mark_dirty_caps %p %llx mask %s, "
1395 "but no auth cap (session was closed?)\n",
1396 inode, ceph_ino(inode), ceph_cap_string(mask));
1400 dout("__mark_dirty_caps %p %s dirty %s -> %s\n", &ci->vfs_inode,
1401 ceph_cap_string(mask), ceph_cap_string(was),
1402 ceph_cap_string(was | mask));
1403 ci->i_dirty_caps |= mask;
1405 WARN_ON_ONCE(ci->i_prealloc_cap_flush);
1406 swap(ci->i_prealloc_cap_flush, *pcf);
1408 if (!ci->i_head_snapc) {
1409 WARN_ON_ONCE(!rwsem_is_locked(&mdsc->snap_rwsem));
1410 ci->i_head_snapc = ceph_get_snap_context(
1411 ci->i_snap_realm->cached_context);
1413 dout(" inode %p now dirty snapc %p auth cap %p\n",
1414 &ci->vfs_inode, ci->i_head_snapc, ci->i_auth_cap);
1415 BUG_ON(!list_empty(&ci->i_dirty_item));
1416 spin_lock(&mdsc->cap_dirty_lock);
1417 list_add(&ci->i_dirty_item, &mdsc->cap_dirty);
1418 spin_unlock(&mdsc->cap_dirty_lock);
1419 if (ci->i_flushing_caps == 0) {
1421 dirty |= I_DIRTY_SYNC;
1424 WARN_ON_ONCE(!ci->i_prealloc_cap_flush);
1426 BUG_ON(list_empty(&ci->i_dirty_item));
1427 if (((was | ci->i_flushing_caps) & CEPH_CAP_FILE_BUFFER) &&
1428 (mask & CEPH_CAP_FILE_BUFFER))
1429 dirty |= I_DIRTY_DATASYNC;
1430 __cap_delay_requeue(mdsc, ci);
1434 struct ceph_cap_flush *ceph_alloc_cap_flush(void)
1436 return kmem_cache_alloc(ceph_cap_flush_cachep, GFP_KERNEL);
1439 void ceph_free_cap_flush(struct ceph_cap_flush *cf)
1442 kmem_cache_free(ceph_cap_flush_cachep, cf);
1445 static u64 __get_oldest_flush_tid(struct ceph_mds_client *mdsc)
1447 if (!list_empty(&mdsc->cap_flush_list)) {
1448 struct ceph_cap_flush *cf =
1449 list_first_entry(&mdsc->cap_flush_list,
1450 struct ceph_cap_flush, g_list);
1457 * Add dirty inode to the flushing list. Assigned a seq number so we
1458 * can wait for caps to flush without starving.
1460 * Called under i_ceph_lock.
1462 static int __mark_caps_flushing(struct inode *inode,
1463 struct ceph_mds_session *session,
1464 u64 *flush_tid, u64 *oldest_flush_tid)
1466 struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
1467 struct ceph_inode_info *ci = ceph_inode(inode);
1468 struct ceph_cap_flush *cf = NULL;
1471 BUG_ON(ci->i_dirty_caps == 0);
1472 BUG_ON(list_empty(&ci->i_dirty_item));
1473 BUG_ON(!ci->i_prealloc_cap_flush);
1475 flushing = ci->i_dirty_caps;
1476 dout("__mark_caps_flushing flushing %s, flushing_caps %s -> %s\n",
1477 ceph_cap_string(flushing),
1478 ceph_cap_string(ci->i_flushing_caps),
1479 ceph_cap_string(ci->i_flushing_caps | flushing));
1480 ci->i_flushing_caps |= flushing;
1481 ci->i_dirty_caps = 0;
1482 dout(" inode %p now !dirty\n", inode);
1484 swap(cf, ci->i_prealloc_cap_flush);
1485 cf->caps = flushing;
1487 spin_lock(&mdsc->cap_dirty_lock);
1488 list_del_init(&ci->i_dirty_item);
1490 cf->tid = ++mdsc->last_cap_flush_tid;
1491 list_add_tail(&cf->g_list, &mdsc->cap_flush_list);
1492 *oldest_flush_tid = __get_oldest_flush_tid(mdsc);
1494 if (list_empty(&ci->i_flushing_item)) {
1495 list_add_tail(&ci->i_flushing_item, &session->s_cap_flushing);
1496 mdsc->num_cap_flushing++;
1498 spin_unlock(&mdsc->cap_dirty_lock);
1500 list_add_tail(&cf->i_list, &ci->i_cap_flush_list);
1502 *flush_tid = cf->tid;
1507 * try to invalidate mapping pages without blocking.
1509 static int try_nonblocking_invalidate(struct inode *inode)
1511 struct ceph_inode_info *ci = ceph_inode(inode);
1512 u32 invalidating_gen = ci->i_rdcache_gen;
1514 spin_unlock(&ci->i_ceph_lock);
1515 invalidate_mapping_pages(&inode->i_data, 0, -1);
1516 spin_lock(&ci->i_ceph_lock);
1518 if (inode->i_data.nrpages == 0 &&
1519 invalidating_gen == ci->i_rdcache_gen) {
1521 dout("try_nonblocking_invalidate %p success\n", inode);
1522 /* save any racing async invalidate some trouble */
1523 ci->i_rdcache_revoking = ci->i_rdcache_gen - 1;
1526 dout("try_nonblocking_invalidate %p failed\n", inode);
1531 * Swiss army knife function to examine currently used and wanted
1532 * versus held caps. Release, flush, ack revoked caps to mds as
1535 * CHECK_CAPS_NODELAY - caller is delayed work and we should not delay
1536 * cap release further.
1537 * CHECK_CAPS_AUTHONLY - we should only check the auth cap
1538 * CHECK_CAPS_FLUSH - we should flush any dirty caps immediately, without
1541 void ceph_check_caps(struct ceph_inode_info *ci, int flags,
1542 struct ceph_mds_session *session)
1544 struct ceph_fs_client *fsc = ceph_inode_to_client(&ci->vfs_inode);
1545 struct ceph_mds_client *mdsc = fsc->mdsc;
1546 struct inode *inode = &ci->vfs_inode;
1547 struct ceph_cap *cap;
1548 u64 flush_tid, oldest_flush_tid;
1549 int file_wanted, used, cap_used;
1550 int took_snap_rwsem = 0; /* true if mdsc->snap_rwsem held */
1551 int issued, implemented, want, retain, revoking, flushing = 0;
1552 int mds = -1; /* keep track of how far we've gone through i_caps list
1553 to avoid an infinite loop on retry */
1555 int delayed = 0, sent = 0, num;
1556 bool is_delayed = flags & CHECK_CAPS_NODELAY;
1557 bool queue_invalidate = false;
1558 bool force_requeue = false;
1559 bool tried_invalidate = false;
1561 /* if we are unmounting, flush any unused caps immediately. */
1565 spin_lock(&ci->i_ceph_lock);
1567 if (ci->i_ceph_flags & CEPH_I_FLUSH)
1568 flags |= CHECK_CAPS_FLUSH;
1572 spin_lock(&ci->i_ceph_lock);
1574 file_wanted = __ceph_caps_file_wanted(ci);
1575 used = __ceph_caps_used(ci);
1576 issued = __ceph_caps_issued(ci, &implemented);
1577 revoking = implemented & ~issued;
1580 retain = file_wanted | used | CEPH_CAP_PIN;
1581 if (!mdsc->stopping && inode->i_nlink > 0) {
1583 retain |= CEPH_CAP_ANY; /* be greedy */
1584 } else if (S_ISDIR(inode->i_mode) &&
1585 (issued & CEPH_CAP_FILE_SHARED) &&
1586 __ceph_dir_is_complete(ci)) {
1588 * If a directory is complete, we want to keep
1589 * the exclusive cap. So that MDS does not end up
1590 * revoking the shared cap on every create/unlink
1593 want = CEPH_CAP_ANY_SHARED | CEPH_CAP_FILE_EXCL;
1597 retain |= CEPH_CAP_ANY_SHARED;
1599 * keep RD only if we didn't have the file open RW,
1600 * because then the mds would revoke it anyway to
1601 * journal max_size=0.
1603 if (ci->i_max_size == 0)
1604 retain |= CEPH_CAP_ANY_RD;
1608 dout("check_caps %p file_want %s used %s dirty %s flushing %s"
1609 " issued %s revoking %s retain %s %s%s%s\n", inode,
1610 ceph_cap_string(file_wanted),
1611 ceph_cap_string(used), ceph_cap_string(ci->i_dirty_caps),
1612 ceph_cap_string(ci->i_flushing_caps),
1613 ceph_cap_string(issued), ceph_cap_string(revoking),
1614 ceph_cap_string(retain),
1615 (flags & CHECK_CAPS_AUTHONLY) ? " AUTHONLY" : "",
1616 (flags & CHECK_CAPS_NODELAY) ? " NODELAY" : "",
1617 (flags & CHECK_CAPS_FLUSH) ? " FLUSH" : "");
1620 * If we no longer need to hold onto old our caps, and we may
1621 * have cached pages, but don't want them, then try to invalidate.
1622 * If we fail, it's because pages are locked.... try again later.
1624 if ((!is_delayed || mdsc->stopping) &&
1625 !S_ISDIR(inode->i_mode) && /* ignore readdir cache */
1626 !(ci->i_wb_ref || ci->i_wrbuffer_ref) && /* no dirty pages... */
1627 inode->i_data.nrpages && /* have cached pages */
1628 (revoking & (CEPH_CAP_FILE_CACHE|
1629 CEPH_CAP_FILE_LAZYIO)) && /* or revoking cache */
1630 !tried_invalidate) {
1631 dout("check_caps trying to invalidate on %p\n", inode);
1632 if (try_nonblocking_invalidate(inode) < 0) {
1633 if (revoking & (CEPH_CAP_FILE_CACHE|
1634 CEPH_CAP_FILE_LAZYIO)) {
1635 dout("check_caps queuing invalidate\n");
1636 queue_invalidate = true;
1637 ci->i_rdcache_revoking = ci->i_rdcache_gen;
1639 dout("check_caps failed to invalidate pages\n");
1640 /* we failed to invalidate pages. check these
1641 caps again later. */
1642 force_requeue = true;
1643 __cap_set_timeouts(mdsc, ci);
1646 tried_invalidate = true;
1651 for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
1652 cap = rb_entry(p, struct ceph_cap, ci_node);
1655 /* avoid looping forever */
1656 if (mds >= cap->mds ||
1657 ((flags & CHECK_CAPS_AUTHONLY) && cap != ci->i_auth_cap))
1660 /* NOTE: no side-effects allowed, until we take s_mutex */
1663 if (ci->i_auth_cap && cap != ci->i_auth_cap)
1664 cap_used &= ~ci->i_auth_cap->issued;
1666 revoking = cap->implemented & ~cap->issued;
1667 dout(" mds%d cap %p used %s issued %s implemented %s revoking %s\n",
1668 cap->mds, cap, ceph_cap_string(cap_used),
1669 ceph_cap_string(cap->issued),
1670 ceph_cap_string(cap->implemented),
1671 ceph_cap_string(revoking));
1673 if (cap == ci->i_auth_cap &&
1674 (cap->issued & CEPH_CAP_FILE_WR)) {
1675 /* request larger max_size from MDS? */
1676 if (ci->i_wanted_max_size > ci->i_max_size &&
1677 ci->i_wanted_max_size > ci->i_requested_max_size) {
1678 dout("requesting new max_size\n");
1682 /* approaching file_max? */
1683 if ((inode->i_size << 1) >= ci->i_max_size &&
1684 (ci->i_reported_size << 1) < ci->i_max_size) {
1685 dout("i_size approaching max_size\n");
1689 /* flush anything dirty? */
1690 if (cap == ci->i_auth_cap) {
1691 if ((flags & CHECK_CAPS_FLUSH) && ci->i_dirty_caps) {
1692 dout("flushing dirty caps\n");
1695 if (ci->i_ceph_flags & CEPH_I_FLUSH_SNAPS) {
1696 dout("flushing snap caps\n");
1701 /* completed revocation? going down and there are no caps? */
1702 if (revoking && (revoking & cap_used) == 0) {
1703 dout("completed revocation of %s\n",
1704 ceph_cap_string(cap->implemented & ~cap->issued));
1708 /* want more caps from mds? */
1709 if (want & ~(cap->mds_wanted | cap->issued))
1712 /* things we might delay */
1713 if ((cap->issued & ~retain) == 0 &&
1714 cap->mds_wanted == want)
1715 continue; /* nope, all good */
1721 if ((ci->i_ceph_flags & CEPH_I_NODELAY) == 0 &&
1722 time_before(jiffies, ci->i_hold_caps_max)) {
1723 dout(" delaying issued %s -> %s, wanted %s -> %s\n",
1724 ceph_cap_string(cap->issued),
1725 ceph_cap_string(cap->issued & retain),
1726 ceph_cap_string(cap->mds_wanted),
1727 ceph_cap_string(want));
1733 if (ci->i_ceph_flags & CEPH_I_NOFLUSH) {
1734 dout(" skipping %p I_NOFLUSH set\n", inode);
1738 if (session && session != cap->session) {
1739 dout("oops, wrong session %p mutex\n", session);
1740 mutex_unlock(&session->s_mutex);
1744 session = cap->session;
1745 if (mutex_trylock(&session->s_mutex) == 0) {
1746 dout("inverting session/ino locks on %p\n",
1748 spin_unlock(&ci->i_ceph_lock);
1749 if (took_snap_rwsem) {
1750 up_read(&mdsc->snap_rwsem);
1751 took_snap_rwsem = 0;
1753 mutex_lock(&session->s_mutex);
1758 /* kick flushing and flush snaps before sending normal
1760 if (cap == ci->i_auth_cap &&
1762 (CEPH_I_KICK_FLUSH | CEPH_I_FLUSH_SNAPS))) {
1763 if (ci->i_ceph_flags & CEPH_I_KICK_FLUSH) {
1764 spin_lock(&mdsc->cap_dirty_lock);
1765 oldest_flush_tid = __get_oldest_flush_tid(mdsc);
1766 spin_unlock(&mdsc->cap_dirty_lock);
1767 __kick_flushing_caps(mdsc, session, ci,
1769 ci->i_ceph_flags &= ~CEPH_I_KICK_FLUSH;
1771 if (ci->i_ceph_flags & CEPH_I_FLUSH_SNAPS) {
1772 __ceph_flush_snaps(ci, &session);
1773 ci->i_ceph_flags &= ~CEPH_I_FLUSH_SNAPS;
1778 /* take snap_rwsem after session mutex */
1779 if (!took_snap_rwsem) {
1780 if (down_read_trylock(&mdsc->snap_rwsem) == 0) {
1781 dout("inverting snap/in locks on %p\n",
1783 spin_unlock(&ci->i_ceph_lock);
1784 down_read(&mdsc->snap_rwsem);
1785 took_snap_rwsem = 1;
1788 took_snap_rwsem = 1;
1791 if (cap == ci->i_auth_cap && ci->i_dirty_caps) {
1792 flushing = __mark_caps_flushing(inode, session,
1798 spin_lock(&mdsc->cap_dirty_lock);
1799 oldest_flush_tid = __get_oldest_flush_tid(mdsc);
1800 spin_unlock(&mdsc->cap_dirty_lock);
1803 mds = cap->mds; /* remember mds, so we don't repeat */
1806 /* __send_cap drops i_ceph_lock */
1807 delayed += __send_cap(mdsc, cap, CEPH_CAP_OP_UPDATE, cap_used,
1808 want, retain, flushing,
1809 flush_tid, oldest_flush_tid);
1810 goto retry; /* retake i_ceph_lock and restart our cap scan. */
1814 * Reschedule delayed caps release if we delayed anything,
1817 if (delayed && is_delayed)
1818 force_requeue = true; /* __send_cap delayed release; requeue */
1819 if (!delayed && !is_delayed)
1820 __cap_delay_cancel(mdsc, ci);
1821 else if (!is_delayed || force_requeue)
1822 __cap_delay_requeue(mdsc, ci);
1824 spin_unlock(&ci->i_ceph_lock);
1826 if (queue_invalidate)
1827 ceph_queue_invalidate(inode);
1830 mutex_unlock(&session->s_mutex);
1831 if (took_snap_rwsem)
1832 up_read(&mdsc->snap_rwsem);
1836 * Try to flush dirty caps back to the auth mds.
1838 static int try_flush_caps(struct inode *inode, u64 *ptid)
1840 struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
1841 struct ceph_inode_info *ci = ceph_inode(inode);
1842 struct ceph_mds_session *session = NULL;
1844 u64 flush_tid = 0, oldest_flush_tid = 0;
1847 spin_lock(&ci->i_ceph_lock);
1848 if (ci->i_ceph_flags & CEPH_I_NOFLUSH) {
1849 dout("try_flush_caps skipping %p I_NOFLUSH set\n", inode);
1852 if (ci->i_dirty_caps && ci->i_auth_cap) {
1853 struct ceph_cap *cap = ci->i_auth_cap;
1854 int used = __ceph_caps_used(ci);
1855 int want = __ceph_caps_wanted(ci);
1858 if (!session || session != cap->session) {
1859 spin_unlock(&ci->i_ceph_lock);
1861 mutex_unlock(&session->s_mutex);
1862 session = cap->session;
1863 mutex_lock(&session->s_mutex);
1866 if (cap->session->s_state < CEPH_MDS_SESSION_OPEN)
1869 flushing = __mark_caps_flushing(inode, session, &flush_tid,
1872 /* __send_cap drops i_ceph_lock */
1873 delayed = __send_cap(mdsc, cap, CEPH_CAP_OP_FLUSH, used, want,
1874 (cap->issued | cap->implemented),
1875 flushing, flush_tid, oldest_flush_tid);
1878 spin_lock(&ci->i_ceph_lock);
1879 __cap_delay_requeue(mdsc, ci);
1880 spin_unlock(&ci->i_ceph_lock);
1883 if (!list_empty(&ci->i_cap_flush_list)) {
1884 struct ceph_cap_flush *cf =
1885 list_last_entry(&ci->i_cap_flush_list,
1886 struct ceph_cap_flush, i_list);
1887 flush_tid = cf->tid;
1889 flushing = ci->i_flushing_caps;
1890 spin_unlock(&ci->i_ceph_lock);
1894 mutex_unlock(&session->s_mutex);
1901 * Return true if we've flushed caps through the given flush_tid.
1903 static int caps_are_flushed(struct inode *inode, u64 flush_tid)
1905 struct ceph_inode_info *ci = ceph_inode(inode);
1908 spin_lock(&ci->i_ceph_lock);
1909 if (!list_empty(&ci->i_cap_flush_list)) {
1910 struct ceph_cap_flush * cf =
1911 list_first_entry(&ci->i_cap_flush_list,
1912 struct ceph_cap_flush, i_list);
1913 if (cf->tid <= flush_tid)
1916 spin_unlock(&ci->i_ceph_lock);
1921 * wait for any unsafe requests to complete.
1923 static int unsafe_request_wait(struct inode *inode)
1925 struct ceph_inode_info *ci = ceph_inode(inode);
1926 struct ceph_mds_request *req1 = NULL, *req2 = NULL;
1929 spin_lock(&ci->i_unsafe_lock);
1930 if (S_ISDIR(inode->i_mode) && !list_empty(&ci->i_unsafe_dirops)) {
1931 req1 = list_last_entry(&ci->i_unsafe_dirops,
1932 struct ceph_mds_request,
1934 ceph_mdsc_get_request(req1);
1936 if (!list_empty(&ci->i_unsafe_iops)) {
1937 req2 = list_last_entry(&ci->i_unsafe_iops,
1938 struct ceph_mds_request,
1939 r_unsafe_target_item);
1940 ceph_mdsc_get_request(req2);
1942 spin_unlock(&ci->i_unsafe_lock);
1944 dout("unsafe_requeset_wait %p wait on tid %llu %llu\n",
1945 inode, req1 ? req1->r_tid : 0ULL, req2 ? req2->r_tid : 0ULL);
1947 ret = !wait_for_completion_timeout(&req1->r_safe_completion,
1948 ceph_timeout_jiffies(req1->r_timeout));
1951 ceph_mdsc_put_request(req1);
1954 ret = !wait_for_completion_timeout(&req2->r_safe_completion,
1955 ceph_timeout_jiffies(req2->r_timeout));
1958 ceph_mdsc_put_request(req2);
1963 int ceph_fsync(struct file *file, loff_t start, loff_t end, int datasync)
1965 struct inode *inode = file->f_mapping->host;
1966 struct ceph_inode_info *ci = ceph_inode(inode);
1971 dout("fsync %p%s\n", inode, datasync ? " datasync" : "");
1973 ceph_sync_write_wait(inode);
1975 ret = filemap_write_and_wait_range(inode->i_mapping, start, end);
1984 dirty = try_flush_caps(inode, &flush_tid);
1985 dout("fsync dirty caps are %s\n", ceph_cap_string(dirty));
1987 ret = unsafe_request_wait(inode);
1990 * only wait on non-file metadata writeback (the mds
1991 * can recover size and mtime, so we don't need to
1994 if (!ret && (dirty & ~CEPH_CAP_ANY_FILE_WR)) {
1995 ret = wait_event_interruptible(ci->i_cap_wq,
1996 caps_are_flushed(inode, flush_tid));
1998 inode_unlock(inode);
2000 dout("fsync %p%s result=%d\n", inode, datasync ? " datasync" : "", ret);
2005 * Flush any dirty caps back to the mds. If we aren't asked to wait,
2006 * queue inode for flush but don't do so immediately, because we can
2007 * get by with fewer MDS messages if we wait for data writeback to
2010 int ceph_write_inode(struct inode *inode, struct writeback_control *wbc)
2012 struct ceph_inode_info *ci = ceph_inode(inode);
2016 int wait = wbc->sync_mode == WB_SYNC_ALL;
2018 dout("write_inode %p wait=%d\n", inode, wait);
2020 dirty = try_flush_caps(inode, &flush_tid);
2022 err = wait_event_interruptible(ci->i_cap_wq,
2023 caps_are_flushed(inode, flush_tid));
2025 struct ceph_mds_client *mdsc =
2026 ceph_sb_to_client(inode->i_sb)->mdsc;
2028 spin_lock(&ci->i_ceph_lock);
2029 if (__ceph_caps_dirty(ci))
2030 __cap_delay_requeue_front(mdsc, ci);
2031 spin_unlock(&ci->i_ceph_lock);
2036 static void __kick_flushing_caps(struct ceph_mds_client *mdsc,
2037 struct ceph_mds_session *session,
2038 struct ceph_inode_info *ci,
2039 u64 oldest_flush_tid)
2040 __releases(ci->i_ceph_lock)
2041 __acquires(ci->i_ceph_lock)
2043 struct inode *inode = &ci->vfs_inode;
2044 struct ceph_cap *cap;
2045 struct ceph_cap_flush *cf;
2049 list_for_each_entry(cf, &ci->i_cap_flush_list, i_list) {
2050 if (cf->tid < first_tid)
2053 cap = ci->i_auth_cap;
2054 if (!(cap && cap->session == session)) {
2055 pr_err("%p auth cap %p not mds%d ???\n",
2056 inode, cap, session->s_mds);
2060 first_tid = cf->tid + 1;
2063 dout("kick_flushing_caps %p cap %p tid %llu %s\n",
2064 inode, cap, cf->tid, ceph_cap_string(cf->caps));
2065 ci->i_ceph_flags |= CEPH_I_NODELAY;
2066 ret = __send_cap(mdsc, cap, CEPH_CAP_OP_FLUSH,
2067 __ceph_caps_used(ci),
2068 __ceph_caps_wanted(ci),
2069 cap->issued | cap->implemented,
2070 cf->caps, cf->tid, oldest_flush_tid);
2072 pr_err("kick_flushing_caps: error sending "
2073 "cap flush, ino (%llx.%llx) "
2074 "tid %llu flushing %s\n",
2075 ceph_vinop(inode), cf->tid,
2076 ceph_cap_string(cf->caps));
2079 struct ceph_cap_snap *capsnap =
2080 container_of(cf, struct ceph_cap_snap,
2082 dout("kick_flushing_caps %p capsnap %p tid %llu %s\n",
2083 inode, capsnap, cf->tid,
2084 ceph_cap_string(capsnap->dirty));
2086 atomic_inc(&capsnap->nref);
2087 spin_unlock(&ci->i_ceph_lock);
2089 ret = __send_flush_snap(inode, session, capsnap, cap->mseq,
2092 pr_err("kick_flushing_caps: error sending "
2093 "cap flushsnap, ino (%llx.%llx) "
2094 "tid %llu follows %llu\n",
2095 ceph_vinop(inode), cf->tid,
2099 ceph_put_cap_snap(capsnap);
2102 spin_lock(&ci->i_ceph_lock);
2106 void ceph_early_kick_flushing_caps(struct ceph_mds_client *mdsc,
2107 struct ceph_mds_session *session)
2109 struct ceph_inode_info *ci;
2110 struct ceph_cap *cap;
2111 u64 oldest_flush_tid;
2113 dout("early_kick_flushing_caps mds%d\n", session->s_mds);
2115 spin_lock(&mdsc->cap_dirty_lock);
2116 oldest_flush_tid = __get_oldest_flush_tid(mdsc);
2117 spin_unlock(&mdsc->cap_dirty_lock);
2119 list_for_each_entry(ci, &session->s_cap_flushing, i_flushing_item) {
2120 spin_lock(&ci->i_ceph_lock);
2121 cap = ci->i_auth_cap;
2122 if (!(cap && cap->session == session)) {
2123 pr_err("%p auth cap %p not mds%d ???\n",
2124 &ci->vfs_inode, cap, session->s_mds);
2125 spin_unlock(&ci->i_ceph_lock);
2131 * if flushing caps were revoked, we re-send the cap flush
2132 * in client reconnect stage. This guarantees MDS * processes
2133 * the cap flush message before issuing the flushing caps to
2136 if ((cap->issued & ci->i_flushing_caps) !=
2137 ci->i_flushing_caps) {
2138 ci->i_ceph_flags &= ~CEPH_I_KICK_FLUSH;
2139 __kick_flushing_caps(mdsc, session, ci,
2142 ci->i_ceph_flags |= CEPH_I_KICK_FLUSH;
2145 spin_unlock(&ci->i_ceph_lock);
2149 void ceph_kick_flushing_caps(struct ceph_mds_client *mdsc,
2150 struct ceph_mds_session *session)
2152 struct ceph_inode_info *ci;
2153 struct ceph_cap *cap;
2154 u64 oldest_flush_tid;
2156 dout("kick_flushing_caps mds%d\n", session->s_mds);
2158 spin_lock(&mdsc->cap_dirty_lock);
2159 oldest_flush_tid = __get_oldest_flush_tid(mdsc);
2160 spin_unlock(&mdsc->cap_dirty_lock);
2162 list_for_each_entry(ci, &session->s_cap_flushing, i_flushing_item) {
2163 spin_lock(&ci->i_ceph_lock);
2164 cap = ci->i_auth_cap;
2165 if (!(cap && cap->session == session)) {
2166 pr_err("%p auth cap %p not mds%d ???\n",
2167 &ci->vfs_inode, cap, session->s_mds);
2168 spin_unlock(&ci->i_ceph_lock);
2171 if (ci->i_ceph_flags & CEPH_I_KICK_FLUSH) {
2172 ci->i_ceph_flags &= ~CEPH_I_KICK_FLUSH;
2173 __kick_flushing_caps(mdsc, session, ci,
2176 spin_unlock(&ci->i_ceph_lock);
2180 static void kick_flushing_inode_caps(struct ceph_mds_client *mdsc,
2181 struct ceph_mds_session *session,
2182 struct inode *inode)
2183 __releases(ci->i_ceph_lock)
2185 struct ceph_inode_info *ci = ceph_inode(inode);
2186 struct ceph_cap *cap;
2188 cap = ci->i_auth_cap;
2189 dout("kick_flushing_inode_caps %p flushing %s\n", inode,
2190 ceph_cap_string(ci->i_flushing_caps));
2192 if (!list_empty(&ci->i_cap_flush_list)) {
2193 u64 oldest_flush_tid;
2194 spin_lock(&mdsc->cap_dirty_lock);
2195 list_move_tail(&ci->i_flushing_item,
2196 &cap->session->s_cap_flushing);
2197 oldest_flush_tid = __get_oldest_flush_tid(mdsc);
2198 spin_unlock(&mdsc->cap_dirty_lock);
2200 ci->i_ceph_flags &= ~CEPH_I_KICK_FLUSH;
2201 __kick_flushing_caps(mdsc, session, ci, oldest_flush_tid);
2202 spin_unlock(&ci->i_ceph_lock);
2204 spin_unlock(&ci->i_ceph_lock);
2210 * Take references to capabilities we hold, so that we don't release
2211 * them to the MDS prematurely.
2213 * Protected by i_ceph_lock.
2215 static void __take_cap_refs(struct ceph_inode_info *ci, int got,
2216 bool snap_rwsem_locked)
2218 if (got & CEPH_CAP_PIN)
2220 if (got & CEPH_CAP_FILE_RD)
2222 if (got & CEPH_CAP_FILE_CACHE)
2223 ci->i_rdcache_ref++;
2224 if (got & CEPH_CAP_FILE_WR) {
2225 if (ci->i_wr_ref == 0 && !ci->i_head_snapc) {
2226 BUG_ON(!snap_rwsem_locked);
2227 ci->i_head_snapc = ceph_get_snap_context(
2228 ci->i_snap_realm->cached_context);
2232 if (got & CEPH_CAP_FILE_BUFFER) {
2233 if (ci->i_wb_ref == 0)
2234 ihold(&ci->vfs_inode);
2236 dout("__take_cap_refs %p wb %d -> %d (?)\n",
2237 &ci->vfs_inode, ci->i_wb_ref-1, ci->i_wb_ref);
2242 * Try to grab cap references. Specify those refs we @want, and the
2243 * minimal set we @need. Also include the larger offset we are writing
2244 * to (when applicable), and check against max_size here as well.
2245 * Note that caller is responsible for ensuring max_size increases are
2246 * requested from the MDS.
2248 static int try_get_cap_refs(struct ceph_inode_info *ci, int need, int want,
2249 loff_t endoff, bool nonblock, int *got, int *err)
2251 struct inode *inode = &ci->vfs_inode;
2252 struct ceph_mds_client *mdsc = ceph_inode_to_client(inode)->mdsc;
2254 int have, implemented;
2256 bool snap_rwsem_locked = false;
2258 dout("get_cap_refs %p need %s want %s\n", inode,
2259 ceph_cap_string(need), ceph_cap_string(want));
2262 spin_lock(&ci->i_ceph_lock);
2264 /* make sure file is actually open */
2265 file_wanted = __ceph_caps_file_wanted(ci);
2266 if ((file_wanted & need) != need) {
2267 dout("try_get_cap_refs need %s file_wanted %s, EBADF\n",
2268 ceph_cap_string(need), ceph_cap_string(file_wanted));
2274 /* finish pending truncate */
2275 while (ci->i_truncate_pending) {
2276 spin_unlock(&ci->i_ceph_lock);
2277 if (snap_rwsem_locked) {
2278 up_read(&mdsc->snap_rwsem);
2279 snap_rwsem_locked = false;
2281 __ceph_do_pending_vmtruncate(inode);
2282 spin_lock(&ci->i_ceph_lock);
2285 have = __ceph_caps_issued(ci, &implemented);
2287 if (have & need & CEPH_CAP_FILE_WR) {
2288 if (endoff >= 0 && endoff > (loff_t)ci->i_max_size) {
2289 dout("get_cap_refs %p endoff %llu > maxsize %llu\n",
2290 inode, endoff, ci->i_max_size);
2291 if (endoff > ci->i_requested_max_size) {
2298 * If a sync write is in progress, we must wait, so that we
2299 * can get a final snapshot value for size+mtime.
2301 if (__ceph_have_pending_cap_snap(ci)) {
2302 dout("get_cap_refs %p cap_snap_pending\n", inode);
2307 if ((have & need) == need) {
2309 * Look at (implemented & ~have & not) so that we keep waiting
2310 * on transition from wanted -> needed caps. This is needed
2311 * for WRBUFFER|WR -> WR to avoid a new WR sync write from
2312 * going before a prior buffered writeback happens.
2314 int not = want & ~(have & need);
2315 int revoking = implemented & ~have;
2316 dout("get_cap_refs %p have %s but not %s (revoking %s)\n",
2317 inode, ceph_cap_string(have), ceph_cap_string(not),
2318 ceph_cap_string(revoking));
2319 if ((revoking & not) == 0) {
2320 if (!snap_rwsem_locked &&
2321 !ci->i_head_snapc &&
2322 (need & CEPH_CAP_FILE_WR)) {
2323 if (!down_read_trylock(&mdsc->snap_rwsem)) {
2325 * we can not call down_read() when
2326 * task isn't in TASK_RUNNING state
2334 spin_unlock(&ci->i_ceph_lock);
2335 down_read(&mdsc->snap_rwsem);
2336 snap_rwsem_locked = true;
2339 snap_rwsem_locked = true;
2341 *got = need | (have & want);
2342 if ((need & CEPH_CAP_FILE_RD) &&
2343 !(*got & CEPH_CAP_FILE_CACHE))
2344 ceph_disable_fscache_readpage(ci);
2345 __take_cap_refs(ci, *got, true);
2349 int session_readonly = false;
2350 if ((need & CEPH_CAP_FILE_WR) && ci->i_auth_cap) {
2351 struct ceph_mds_session *s = ci->i_auth_cap->session;
2352 spin_lock(&s->s_cap_lock);
2353 session_readonly = s->s_readonly;
2354 spin_unlock(&s->s_cap_lock);
2356 if (session_readonly) {
2357 dout("get_cap_refs %p needed %s but mds%d readonly\n",
2358 inode, ceph_cap_string(need), ci->i_auth_cap->mds);
2364 if (ci->i_ceph_flags & CEPH_I_CAP_DROPPED) {
2366 if (ACCESS_ONCE(mdsc->fsc->mount_state) ==
2367 CEPH_MOUNT_SHUTDOWN) {
2368 dout("get_cap_refs %p forced umount\n", inode);
2373 mds_wanted = __ceph_caps_mds_wanted(ci);
2374 if ((mds_wanted & need) != need) {
2375 dout("get_cap_refs %p caps were dropped"
2376 " (session killed?)\n", inode);
2381 if ((mds_wanted & file_wanted) ==
2382 (file_wanted & (CEPH_CAP_FILE_RD|CEPH_CAP_FILE_WR)))
2383 ci->i_ceph_flags &= ~CEPH_I_CAP_DROPPED;
2386 dout("get_cap_refs %p have %s needed %s\n", inode,
2387 ceph_cap_string(have), ceph_cap_string(need));
2390 spin_unlock(&ci->i_ceph_lock);
2391 if (snap_rwsem_locked)
2392 up_read(&mdsc->snap_rwsem);
2394 dout("get_cap_refs %p ret %d got %s\n", inode,
2395 ret, ceph_cap_string(*got));
2400 * Check the offset we are writing up to against our current
2401 * max_size. If necessary, tell the MDS we want to write to
2404 static void check_max_size(struct inode *inode, loff_t endoff)
2406 struct ceph_inode_info *ci = ceph_inode(inode);
2409 /* do we need to explicitly request a larger max_size? */
2410 spin_lock(&ci->i_ceph_lock);
2411 if (endoff >= ci->i_max_size && endoff > ci->i_wanted_max_size) {
2412 dout("write %p at large endoff %llu, req max_size\n",
2414 ci->i_wanted_max_size = endoff;
2416 /* duplicate ceph_check_caps()'s logic */
2417 if (ci->i_auth_cap &&
2418 (ci->i_auth_cap->issued & CEPH_CAP_FILE_WR) &&
2419 ci->i_wanted_max_size > ci->i_max_size &&
2420 ci->i_wanted_max_size > ci->i_requested_max_size)
2422 spin_unlock(&ci->i_ceph_lock);
2424 ceph_check_caps(ci, CHECK_CAPS_AUTHONLY, NULL);
2428 * Wait for caps, and take cap references. If we can't get a WR cap
2429 * due to a small max_size, make sure we check_max_size (and possibly
2430 * ask the mds) so we don't get hung up indefinitely.
2432 int ceph_get_caps(struct ceph_inode_info *ci, int need, int want,
2433 loff_t endoff, int *got, struct page **pinned_page)
2435 int _got, ret, err = 0;
2437 ret = ceph_pool_perm_check(ci, need);
2443 check_max_size(&ci->vfs_inode, endoff);
2447 ret = try_get_cap_refs(ci, need, want, endoff,
2448 false, &_got, &err);
2455 ret = wait_event_interruptible(ci->i_cap_wq,
2456 try_get_cap_refs(ci, need, want, endoff,
2457 true, &_got, &err));
2464 if (err == -ESTALE) {
2465 /* session was killed, try renew caps */
2466 ret = ceph_renew_caps(&ci->vfs_inode);
2473 if (ci->i_inline_version != CEPH_INLINE_NONE &&
2474 (_got & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) &&
2475 i_size_read(&ci->vfs_inode) > 0) {
2477 find_get_page(ci->vfs_inode.i_mapping, 0);
2479 if (PageUptodate(page)) {
2480 *pinned_page = page;
2486 * drop cap refs first because getattr while
2487 * holding * caps refs can cause deadlock.
2489 ceph_put_cap_refs(ci, _got);
2493 * getattr request will bring inline data into
2496 ret = __ceph_do_getattr(&ci->vfs_inode, NULL,
2497 CEPH_STAT_CAP_INLINE_DATA,
2506 if ((_got & CEPH_CAP_FILE_RD) && (_got & CEPH_CAP_FILE_CACHE))
2507 ceph_fscache_revalidate_cookie(ci);
2514 * Take cap refs. Caller must already know we hold at least one ref
2515 * on the caps in question or we don't know this is safe.
2517 void ceph_get_cap_refs(struct ceph_inode_info *ci, int caps)
2519 spin_lock(&ci->i_ceph_lock);
2520 __take_cap_refs(ci, caps, false);
2521 spin_unlock(&ci->i_ceph_lock);
2526 * drop cap_snap that is not associated with any snapshot.
2527 * we don't need to send FLUSHSNAP message for it.
2529 static int ceph_try_drop_cap_snap(struct ceph_inode_info *ci,
2530 struct ceph_cap_snap *capsnap)
2532 if (!capsnap->need_flush &&
2533 !capsnap->writing && !capsnap->dirty_pages) {
2534 dout("dropping cap_snap %p follows %llu\n",
2535 capsnap, capsnap->follows);
2536 BUG_ON(capsnap->cap_flush.tid > 0);
2537 ceph_put_snap_context(capsnap->context);
2538 if (!list_is_last(&capsnap->ci_item, &ci->i_cap_snaps))
2539 ci->i_ceph_flags |= CEPH_I_FLUSH_SNAPS;
2541 list_del(&capsnap->ci_item);
2542 ceph_put_cap_snap(capsnap);
2551 * If we released the last ref on any given cap, call ceph_check_caps
2552 * to release (or schedule a release).
2554 * If we are releasing a WR cap (from a sync write), finalize any affected
2555 * cap_snap, and wake up any waiters.
2557 void ceph_put_cap_refs(struct ceph_inode_info *ci, int had)
2559 struct inode *inode = &ci->vfs_inode;
2560 int last = 0, put = 0, flushsnaps = 0, wake = 0;
2562 spin_lock(&ci->i_ceph_lock);
2563 if (had & CEPH_CAP_PIN)
2565 if (had & CEPH_CAP_FILE_RD)
2566 if (--ci->i_rd_ref == 0)
2568 if (had & CEPH_CAP_FILE_CACHE)
2569 if (--ci->i_rdcache_ref == 0)
2571 if (had & CEPH_CAP_FILE_BUFFER) {
2572 if (--ci->i_wb_ref == 0) {
2576 dout("put_cap_refs %p wb %d -> %d (?)\n",
2577 inode, ci->i_wb_ref+1, ci->i_wb_ref);
2579 if (had & CEPH_CAP_FILE_WR)
2580 if (--ci->i_wr_ref == 0) {
2582 if (__ceph_have_pending_cap_snap(ci)) {
2583 struct ceph_cap_snap *capsnap =
2584 list_last_entry(&ci->i_cap_snaps,
2585 struct ceph_cap_snap,
2587 capsnap->writing = 0;
2588 if (ceph_try_drop_cap_snap(ci, capsnap))
2590 else if (__ceph_finish_cap_snap(ci, capsnap))
2594 if (ci->i_wrbuffer_ref_head == 0 &&
2595 ci->i_dirty_caps == 0 &&
2596 ci->i_flushing_caps == 0) {
2597 BUG_ON(!ci->i_head_snapc);
2598 ceph_put_snap_context(ci->i_head_snapc);
2599 ci->i_head_snapc = NULL;
2601 /* see comment in __ceph_remove_cap() */
2602 if (!__ceph_is_any_caps(ci) && ci->i_snap_realm)
2603 drop_inode_snap_realm(ci);
2605 spin_unlock(&ci->i_ceph_lock);
2607 dout("put_cap_refs %p had %s%s%s\n", inode, ceph_cap_string(had),
2608 last ? " last" : "", put ? " put" : "");
2610 if (last && !flushsnaps)
2611 ceph_check_caps(ci, 0, NULL);
2612 else if (flushsnaps)
2613 ceph_flush_snaps(ci);
2615 wake_up_all(&ci->i_cap_wq);
2621 * Release @nr WRBUFFER refs on dirty pages for the given @snapc snap
2622 * context. Adjust per-snap dirty page accounting as appropriate.
2623 * Once all dirty data for a cap_snap is flushed, flush snapped file
2624 * metadata back to the MDS. If we dropped the last ref, call
2627 void ceph_put_wrbuffer_cap_refs(struct ceph_inode_info *ci, int nr,
2628 struct ceph_snap_context *snapc)
2630 struct inode *inode = &ci->vfs_inode;
2631 struct ceph_cap_snap *capsnap = NULL;
2635 bool flush_snaps = false;
2636 bool complete_capsnap = false;
2638 spin_lock(&ci->i_ceph_lock);
2639 ci->i_wrbuffer_ref -= nr;
2640 if (ci->i_wrbuffer_ref == 0) {
2645 if (ci->i_head_snapc == snapc) {
2646 ci->i_wrbuffer_ref_head -= nr;
2647 if (ci->i_wrbuffer_ref_head == 0 &&
2648 ci->i_wr_ref == 0 &&
2649 ci->i_dirty_caps == 0 &&
2650 ci->i_flushing_caps == 0) {
2651 BUG_ON(!ci->i_head_snapc);
2652 ceph_put_snap_context(ci->i_head_snapc);
2653 ci->i_head_snapc = NULL;
2655 dout("put_wrbuffer_cap_refs on %p head %d/%d -> %d/%d %s\n",
2657 ci->i_wrbuffer_ref+nr, ci->i_wrbuffer_ref_head+nr,
2658 ci->i_wrbuffer_ref, ci->i_wrbuffer_ref_head,
2659 last ? " LAST" : "");
2661 list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) {
2662 if (capsnap->context == snapc) {
2668 capsnap->dirty_pages -= nr;
2669 if (capsnap->dirty_pages == 0) {
2670 complete_capsnap = true;
2671 if (!capsnap->writing) {
2672 if (ceph_try_drop_cap_snap(ci, capsnap)) {
2675 ci->i_ceph_flags |= CEPH_I_FLUSH_SNAPS;
2680 dout("put_wrbuffer_cap_refs on %p cap_snap %p "
2681 " snap %lld %d/%d -> %d/%d %s%s\n",
2682 inode, capsnap, capsnap->context->seq,
2683 ci->i_wrbuffer_ref+nr, capsnap->dirty_pages + nr,
2684 ci->i_wrbuffer_ref, capsnap->dirty_pages,
2685 last ? " (wrbuffer last)" : "",
2686 complete_capsnap ? " (complete capsnap)" : "");
2689 spin_unlock(&ci->i_ceph_lock);
2692 ceph_check_caps(ci, CHECK_CAPS_AUTHONLY, NULL);
2693 } else if (flush_snaps) {
2694 ceph_flush_snaps(ci);
2696 if (complete_capsnap)
2697 wake_up_all(&ci->i_cap_wq);
2703 * Invalidate unlinked inode's aliases, so we can drop the inode ASAP.
2705 static void invalidate_aliases(struct inode *inode)
2707 struct dentry *dn, *prev = NULL;
2709 dout("invalidate_aliases inode %p\n", inode);
2710 d_prune_aliases(inode);
2712 * For non-directory inode, d_find_alias() only returns
2713 * hashed dentry. After calling d_invalidate(), the
2714 * dentry becomes unhashed.
2716 * For directory inode, d_find_alias() can return
2717 * unhashed dentry. But directory inode should have
2718 * one alias at most.
2720 while ((dn = d_find_alias(inode))) {
2735 * Handle a cap GRANT message from the MDS. (Note that a GRANT may
2736 * actually be a revocation if it specifies a smaller cap set.)
2738 * caller holds s_mutex and i_ceph_lock, we drop both.
2740 static void handle_cap_grant(struct ceph_mds_client *mdsc,
2741 struct inode *inode, struct ceph_mds_caps *grant,
2742 struct ceph_string **pns, u64 inline_version,
2743 void *inline_data, u32 inline_len,
2744 struct ceph_buffer *xattr_buf,
2745 struct ceph_mds_session *session,
2746 struct ceph_cap *cap, int issued)
2747 __releases(ci->i_ceph_lock)
2748 __releases(mdsc->snap_rwsem)
2750 struct ceph_inode_info *ci = ceph_inode(inode);
2751 int mds = session->s_mds;
2752 int seq = le32_to_cpu(grant->seq);
2753 int newcaps = le32_to_cpu(grant->caps);
2754 int used, wanted, dirty;
2755 u64 size = le64_to_cpu(grant->size);
2756 u64 max_size = le64_to_cpu(grant->max_size);
2757 struct timespec mtime, atime, ctime;
2760 bool writeback = false;
2761 bool queue_trunc = false;
2762 bool queue_invalidate = false;
2763 bool deleted_inode = false;
2764 bool fill_inline = false;
2766 dout("handle_cap_grant inode %p cap %p mds%d seq %d %s\n",
2767 inode, cap, mds, seq, ceph_cap_string(newcaps));
2768 dout(" size %llu max_size %llu, i_size %llu\n", size, max_size,
2773 * auth mds of the inode changed. we received the cap export message,
2774 * but still haven't received the cap import message. handle_cap_export
2775 * updated the new auth MDS' cap.
2777 * "ceph_seq_cmp(seq, cap->seq) <= 0" means we are processing a message
2778 * that was sent before the cap import message. So don't remove caps.
2780 if (ceph_seq_cmp(seq, cap->seq) <= 0) {
2781 WARN_ON(cap != ci->i_auth_cap);
2782 WARN_ON(cap->cap_id != le64_to_cpu(grant->cap_id));
2784 newcaps |= cap->issued;
2788 * If CACHE is being revoked, and we have no dirty buffers,
2789 * try to invalidate (once). (If there are dirty buffers, we
2790 * will invalidate _after_ writeback.)
2792 if (!S_ISDIR(inode->i_mode) && /* don't invalidate readdir cache */
2793 ((cap->issued & ~newcaps) & CEPH_CAP_FILE_CACHE) &&
2794 (newcaps & CEPH_CAP_FILE_LAZYIO) == 0 &&
2795 !(ci->i_wrbuffer_ref || ci->i_wb_ref)) {
2796 if (try_nonblocking_invalidate(inode)) {
2797 /* there were locked pages.. invalidate later
2798 in a separate thread. */
2799 if (ci->i_rdcache_revoking != ci->i_rdcache_gen) {
2800 queue_invalidate = true;
2801 ci->i_rdcache_revoking = ci->i_rdcache_gen;
2806 /* side effects now are allowed */
2807 cap->cap_gen = session->s_cap_gen;
2810 __check_cap_issue(ci, cap, newcaps);
2812 if ((newcaps & CEPH_CAP_AUTH_SHARED) &&
2813 (issued & CEPH_CAP_AUTH_EXCL) == 0) {
2814 inode->i_mode = le32_to_cpu(grant->mode);
2815 inode->i_uid = make_kuid(&init_user_ns, le32_to_cpu(grant->uid));
2816 inode->i_gid = make_kgid(&init_user_ns, le32_to_cpu(grant->gid));
2817 dout("%p mode 0%o uid.gid %d.%d\n", inode, inode->i_mode,
2818 from_kuid(&init_user_ns, inode->i_uid),
2819 from_kgid(&init_user_ns, inode->i_gid));
2822 if ((newcaps & CEPH_CAP_AUTH_SHARED) &&
2823 (issued & CEPH_CAP_LINK_EXCL) == 0) {
2824 set_nlink(inode, le32_to_cpu(grant->nlink));
2825 if (inode->i_nlink == 0 &&
2826 (newcaps & (CEPH_CAP_LINK_SHARED | CEPH_CAP_LINK_EXCL)))
2827 deleted_inode = true;
2830 if ((issued & CEPH_CAP_XATTR_EXCL) == 0 && grant->xattr_len) {
2831 int len = le32_to_cpu(grant->xattr_len);
2832 u64 version = le64_to_cpu(grant->xattr_version);
2834 if (version > ci->i_xattrs.version) {
2835 dout(" got new xattrs v%llu on %p len %d\n",
2836 version, inode, len);
2837 if (ci->i_xattrs.blob)
2838 ceph_buffer_put(ci->i_xattrs.blob);
2839 ci->i_xattrs.blob = ceph_buffer_get(xattr_buf);
2840 ci->i_xattrs.version = version;
2841 ceph_forget_all_cached_acls(inode);
2845 if (newcaps & CEPH_CAP_ANY_RD) {
2846 /* ctime/mtime/atime? */
2847 ceph_decode_timespec(&mtime, &grant->mtime);
2848 ceph_decode_timespec(&atime, &grant->atime);
2849 ceph_decode_timespec(&ctime, &grant->ctime);
2850 ceph_fill_file_time(inode, issued,
2851 le32_to_cpu(grant->time_warp_seq),
2852 &ctime, &mtime, &atime);
2855 if (newcaps & (CEPH_CAP_ANY_FILE_RD | CEPH_CAP_ANY_FILE_WR)) {
2856 /* file layout may have changed */
2857 s64 old_pool = ci->i_layout.pool_id;
2858 struct ceph_string *old_ns;
2860 ceph_file_layout_from_legacy(&ci->i_layout, &grant->layout);
2861 old_ns = rcu_dereference_protected(ci->i_layout.pool_ns,
2862 lockdep_is_held(&ci->i_ceph_lock));
2863 rcu_assign_pointer(ci->i_layout.pool_ns, *pns);
2865 if (ci->i_layout.pool_id != old_pool || *pns != old_ns)
2866 ci->i_ceph_flags &= ~CEPH_I_POOL_PERM;
2870 /* size/truncate_seq? */
2871 queue_trunc = ceph_fill_file_size(inode, issued,
2872 le32_to_cpu(grant->truncate_seq),
2873 le64_to_cpu(grant->truncate_size),
2875 /* max size increase? */
2876 if (ci->i_auth_cap == cap && max_size != ci->i_max_size) {
2877 dout("max_size %lld -> %llu\n",
2878 ci->i_max_size, max_size);
2879 ci->i_max_size = max_size;
2880 if (max_size >= ci->i_wanted_max_size) {
2881 ci->i_wanted_max_size = 0; /* reset */
2882 ci->i_requested_max_size = 0;
2888 /* check cap bits */
2889 wanted = __ceph_caps_wanted(ci);
2890 used = __ceph_caps_used(ci);
2891 dirty = __ceph_caps_dirty(ci);
2892 dout(" my wanted = %s, used = %s, dirty %s\n",
2893 ceph_cap_string(wanted),
2894 ceph_cap_string(used),
2895 ceph_cap_string(dirty));
2896 if (wanted != le32_to_cpu(grant->wanted)) {
2897 dout("mds wanted %s -> %s\n",
2898 ceph_cap_string(le32_to_cpu(grant->wanted)),
2899 ceph_cap_string(wanted));
2900 /* imported cap may not have correct mds_wanted */
2901 if (le32_to_cpu(grant->op) == CEPH_CAP_OP_IMPORT)
2905 /* revocation, grant, or no-op? */
2906 if (cap->issued & ~newcaps) {
2907 int revoking = cap->issued & ~newcaps;
2909 dout("revocation: %s -> %s (revoking %s)\n",
2910 ceph_cap_string(cap->issued),
2911 ceph_cap_string(newcaps),
2912 ceph_cap_string(revoking));
2913 if (revoking & used & CEPH_CAP_FILE_BUFFER)
2914 writeback = true; /* initiate writeback; will delay ack */
2915 else if (revoking == CEPH_CAP_FILE_CACHE &&
2916 (newcaps & CEPH_CAP_FILE_LAZYIO) == 0 &&
2918 ; /* do nothing yet, invalidation will be queued */
2919 else if (cap == ci->i_auth_cap)
2920 check_caps = 1; /* check auth cap only */
2922 check_caps = 2; /* check all caps */
2923 cap->issued = newcaps;
2924 cap->implemented |= newcaps;
2925 } else if (cap->issued == newcaps) {
2926 dout("caps unchanged: %s -> %s\n",
2927 ceph_cap_string(cap->issued), ceph_cap_string(newcaps));
2929 dout("grant: %s -> %s\n", ceph_cap_string(cap->issued),
2930 ceph_cap_string(newcaps));
2931 /* non-auth MDS is revoking the newly grant caps ? */
2932 if (cap == ci->i_auth_cap &&
2933 __ceph_caps_revoking_other(ci, cap, newcaps))
2936 cap->issued = newcaps;
2937 cap->implemented |= newcaps; /* add bits only, to
2938 * avoid stepping on a
2939 * pending revocation */
2942 BUG_ON(cap->issued & ~cap->implemented);
2944 if (inline_version > 0 && inline_version >= ci->i_inline_version) {
2945 ci->i_inline_version = inline_version;
2946 if (ci->i_inline_version != CEPH_INLINE_NONE &&
2947 (newcaps & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)))
2951 if (le32_to_cpu(grant->op) == CEPH_CAP_OP_IMPORT) {
2952 if (newcaps & ~issued)
2954 kick_flushing_inode_caps(mdsc, session, inode);
2955 up_read(&mdsc->snap_rwsem);
2957 spin_unlock(&ci->i_ceph_lock);
2961 ceph_fill_inline_data(inode, NULL, inline_data, inline_len);
2964 ceph_queue_vmtruncate(inode);
2968 * queue inode for writeback: we can't actually call
2969 * filemap_write_and_wait, etc. from message handler
2972 ceph_queue_writeback(inode);
2973 if (queue_invalidate)
2974 ceph_queue_invalidate(inode);
2976 invalidate_aliases(inode);
2978 wake_up_all(&ci->i_cap_wq);
2980 if (check_caps == 1)
2981 ceph_check_caps(ci, CHECK_CAPS_NODELAY|CHECK_CAPS_AUTHONLY,
2983 else if (check_caps == 2)
2984 ceph_check_caps(ci, CHECK_CAPS_NODELAY, session);
2986 mutex_unlock(&session->s_mutex);
2990 * Handle FLUSH_ACK from MDS, indicating that metadata we sent to the
2991 * MDS has been safely committed.
2993 static void handle_cap_flush_ack(struct inode *inode, u64 flush_tid,
2994 struct ceph_mds_caps *m,
2995 struct ceph_mds_session *session,
2996 struct ceph_cap *cap)
2997 __releases(ci->i_ceph_lock)
2999 struct ceph_inode_info *ci = ceph_inode(inode);
3000 struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
3001 struct ceph_cap_flush *cf, *tmp_cf;
3002 LIST_HEAD(to_remove);
3003 unsigned seq = le32_to_cpu(m->seq);
3004 int dirty = le32_to_cpu(m->dirty);
3008 list_for_each_entry_safe(cf, tmp_cf, &ci->i_cap_flush_list, i_list) {
3009 if (cf->tid == flush_tid)
3011 if (cf->caps == 0) /* capsnap */
3013 if (cf->tid <= flush_tid) {
3014 list_del(&cf->i_list);
3015 list_add_tail(&cf->i_list, &to_remove);
3017 cleaned &= ~cf->caps;
3023 dout("handle_cap_flush_ack inode %p mds%d seq %d on %s cleaned %s,"
3024 " flushing %s -> %s\n",
3025 inode, session->s_mds, seq, ceph_cap_string(dirty),
3026 ceph_cap_string(cleaned), ceph_cap_string(ci->i_flushing_caps),
3027 ceph_cap_string(ci->i_flushing_caps & ~cleaned));
3029 if (list_empty(&to_remove) && !cleaned)
3032 ci->i_flushing_caps &= ~cleaned;
3034 spin_lock(&mdsc->cap_dirty_lock);
3036 if (!list_empty(&to_remove)) {
3037 u64 oldest_flush_tid;
3038 list_for_each_entry(cf, &to_remove, i_list)
3039 list_del(&cf->g_list);
3041 oldest_flush_tid = __get_oldest_flush_tid(mdsc);
3042 if (oldest_flush_tid == 0 || oldest_flush_tid > flush_tid)
3043 wake_up_all(&mdsc->cap_flushing_wq);
3046 if (ci->i_flushing_caps == 0) {
3047 if (list_empty(&ci->i_cap_flush_list)) {
3048 list_del_init(&ci->i_flushing_item);
3049 if (!list_empty(&session->s_cap_flushing)) {
3050 dout(" mds%d still flushing cap on %p\n",
3052 &list_first_entry(&session->s_cap_flushing,
3053 struct ceph_inode_info,
3054 i_flushing_item)->vfs_inode);
3057 mdsc->num_cap_flushing--;
3058 dout(" inode %p now !flushing\n", inode);
3060 if (ci->i_dirty_caps == 0) {
3061 dout(" inode %p now clean\n", inode);
3062 BUG_ON(!list_empty(&ci->i_dirty_item));
3064 if (ci->i_wr_ref == 0 &&
3065 ci->i_wrbuffer_ref_head == 0) {
3066 BUG_ON(!ci->i_head_snapc);
3067 ceph_put_snap_context(ci->i_head_snapc);
3068 ci->i_head_snapc = NULL;
3071 BUG_ON(list_empty(&ci->i_dirty_item));
3074 spin_unlock(&mdsc->cap_dirty_lock);
3075 wake_up_all(&ci->i_cap_wq);
3078 spin_unlock(&ci->i_ceph_lock);
3080 while (!list_empty(&to_remove)) {
3081 cf = list_first_entry(&to_remove,
3082 struct ceph_cap_flush, i_list);
3083 list_del(&cf->i_list);
3084 ceph_free_cap_flush(cf);
3091 * Handle FLUSHSNAP_ACK. MDS has flushed snap data to disk and we can
3092 * throw away our cap_snap.
3094 * Caller hold s_mutex.
3096 static void handle_cap_flushsnap_ack(struct inode *inode, u64 flush_tid,
3097 struct ceph_mds_caps *m,
3098 struct ceph_mds_session *session)
3100 struct ceph_inode_info *ci = ceph_inode(inode);
3101 struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
3102 u64 follows = le64_to_cpu(m->snap_follows);
3103 struct ceph_cap_snap *capsnap;
3106 dout("handle_cap_flushsnap_ack inode %p ci %p mds%d follows %lld\n",
3107 inode, ci, session->s_mds, follows);
3109 spin_lock(&ci->i_ceph_lock);
3110 list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) {
3111 if (capsnap->follows == follows) {
3112 if (capsnap->cap_flush.tid != flush_tid) {
3113 dout(" cap_snap %p follows %lld tid %lld !="
3114 " %lld\n", capsnap, follows,
3115 flush_tid, capsnap->cap_flush.tid);
3121 dout(" skipping cap_snap %p follows %lld\n",
3122 capsnap, capsnap->follows);
3126 u64 oldest_flush_tid;
3127 WARN_ON(capsnap->dirty_pages || capsnap->writing);
3128 dout(" removing %p cap_snap %p follows %lld\n",
3129 inode, capsnap, follows);
3130 list_del(&capsnap->ci_item);
3131 list_del(&capsnap->cap_flush.i_list);
3133 spin_lock(&mdsc->cap_dirty_lock);
3135 if (list_empty(&ci->i_cap_flush_list))
3136 list_del_init(&ci->i_flushing_item);
3138 list_del(&capsnap->cap_flush.g_list);
3140 oldest_flush_tid = __get_oldest_flush_tid(mdsc);
3141 if (oldest_flush_tid == 0 || oldest_flush_tid > flush_tid)
3142 wake_up_all(&mdsc->cap_flushing_wq);
3144 spin_unlock(&mdsc->cap_dirty_lock);
3145 wake_up_all(&ci->i_cap_wq);
3147 spin_unlock(&ci->i_ceph_lock);
3149 ceph_put_snap_context(capsnap->context);
3150 ceph_put_cap_snap(capsnap);
3156 * Handle TRUNC from MDS, indicating file truncation.
3158 * caller hold s_mutex.
3160 static void handle_cap_trunc(struct inode *inode,
3161 struct ceph_mds_caps *trunc,
3162 struct ceph_mds_session *session)
3163 __releases(ci->i_ceph_lock)
3165 struct ceph_inode_info *ci = ceph_inode(inode);
3166 int mds = session->s_mds;
3167 int seq = le32_to_cpu(trunc->seq);
3168 u32 truncate_seq = le32_to_cpu(trunc->truncate_seq);
3169 u64 truncate_size = le64_to_cpu(trunc->truncate_size);
3170 u64 size = le64_to_cpu(trunc->size);
3171 int implemented = 0;
3172 int dirty = __ceph_caps_dirty(ci);
3173 int issued = __ceph_caps_issued(ceph_inode(inode), &implemented);
3174 int queue_trunc = 0;
3176 issued |= implemented | dirty;
3178 dout("handle_cap_trunc inode %p mds%d seq %d to %lld seq %d\n",
3179 inode, mds, seq, truncate_size, truncate_seq);
3180 queue_trunc = ceph_fill_file_size(inode, issued,
3181 truncate_seq, truncate_size, size);
3182 spin_unlock(&ci->i_ceph_lock);
3185 ceph_queue_vmtruncate(inode);
3189 * Handle EXPORT from MDS. Cap is being migrated _from_ this mds to a
3190 * different one. If we are the most recent migration we've seen (as
3191 * indicated by mseq), make note of the migrating cap bits for the
3192 * duration (until we see the corresponding IMPORT).
3194 * caller holds s_mutex
3196 static void handle_cap_export(struct inode *inode, struct ceph_mds_caps *ex,
3197 struct ceph_mds_cap_peer *ph,
3198 struct ceph_mds_session *session)
3200 struct ceph_mds_client *mdsc = ceph_inode_to_client(inode)->mdsc;
3201 struct ceph_mds_session *tsession = NULL;
3202 struct ceph_cap *cap, *tcap, *new_cap = NULL;
3203 struct ceph_inode_info *ci = ceph_inode(inode);
3205 unsigned mseq = le32_to_cpu(ex->migrate_seq);
3206 unsigned t_seq, t_mseq;
3208 int mds = session->s_mds;
3211 t_cap_id = le64_to_cpu(ph->cap_id);
3212 t_seq = le32_to_cpu(ph->seq);
3213 t_mseq = le32_to_cpu(ph->mseq);
3214 target = le32_to_cpu(ph->mds);
3216 t_cap_id = t_seq = t_mseq = 0;
3220 dout("handle_cap_export inode %p ci %p mds%d mseq %d target %d\n",
3221 inode, ci, mds, mseq, target);
3223 spin_lock(&ci->i_ceph_lock);
3224 cap = __get_cap_for_mds(ci, mds);
3225 if (!cap || cap->cap_id != le64_to_cpu(ex->cap_id))
3229 __ceph_remove_cap(cap, false);
3230 if (!ci->i_auth_cap)
3231 ci->i_ceph_flags |= CEPH_I_CAP_DROPPED;
3236 * now we know we haven't received the cap import message yet
3237 * because the exported cap still exist.
3240 issued = cap->issued;
3241 WARN_ON(issued != cap->implemented);
3243 tcap = __get_cap_for_mds(ci, target);
3245 /* already have caps from the target */
3246 if (tcap->cap_id != t_cap_id ||
3247 ceph_seq_cmp(tcap->seq, t_seq) < 0) {
3248 dout(" updating import cap %p mds%d\n", tcap, target);
3249 tcap->cap_id = t_cap_id;
3250 tcap->seq = t_seq - 1;
3251 tcap->issue_seq = t_seq - 1;
3252 tcap->mseq = t_mseq;
3253 tcap->issued |= issued;
3254 tcap->implemented |= issued;
3255 if (cap == ci->i_auth_cap)
3256 ci->i_auth_cap = tcap;
3257 if (!list_empty(&ci->i_cap_flush_list) &&
3258 ci->i_auth_cap == tcap) {
3259 spin_lock(&mdsc->cap_dirty_lock);
3260 list_move_tail(&ci->i_flushing_item,
3261 &tcap->session->s_cap_flushing);
3262 spin_unlock(&mdsc->cap_dirty_lock);
3265 __ceph_remove_cap(cap, false);
3267 } else if (tsession) {
3268 /* add placeholder for the export tagert */
3269 int flag = (cap == ci->i_auth_cap) ? CEPH_CAP_FLAG_AUTH : 0;
3270 ceph_add_cap(inode, tsession, t_cap_id, -1, issued, 0,
3271 t_seq - 1, t_mseq, (u64)-1, flag, &new_cap);
3273 __ceph_remove_cap(cap, false);
3277 spin_unlock(&ci->i_ceph_lock);
3278 mutex_unlock(&session->s_mutex);
3280 /* open target session */
3281 tsession = ceph_mdsc_open_export_target_session(mdsc, target);
3282 if (!IS_ERR(tsession)) {
3284 mutex_lock(&session->s_mutex);
3285 mutex_lock_nested(&tsession->s_mutex,
3286 SINGLE_DEPTH_NESTING);
3288 mutex_lock(&tsession->s_mutex);
3289 mutex_lock_nested(&session->s_mutex,
3290 SINGLE_DEPTH_NESTING);
3292 new_cap = ceph_get_cap(mdsc, NULL);
3301 spin_unlock(&ci->i_ceph_lock);
3302 mutex_unlock(&session->s_mutex);
3304 mutex_unlock(&tsession->s_mutex);
3305 ceph_put_mds_session(tsession);
3308 ceph_put_cap(mdsc, new_cap);
3312 * Handle cap IMPORT.
3314 * caller holds s_mutex. acquires i_ceph_lock
3316 static void handle_cap_import(struct ceph_mds_client *mdsc,
3317 struct inode *inode, struct ceph_mds_caps *im,
3318 struct ceph_mds_cap_peer *ph,
3319 struct ceph_mds_session *session,
3320 struct ceph_cap **target_cap, int *old_issued)
3321 __acquires(ci->i_ceph_lock)
3323 struct ceph_inode_info *ci = ceph_inode(inode);
3324 struct ceph_cap *cap, *ocap, *new_cap = NULL;
3325 int mds = session->s_mds;
3327 unsigned caps = le32_to_cpu(im->caps);
3328 unsigned wanted = le32_to_cpu(im->wanted);
3329 unsigned seq = le32_to_cpu(im->seq);
3330 unsigned mseq = le32_to_cpu(im->migrate_seq);
3331 u64 realmino = le64_to_cpu(im->realm);
3332 u64 cap_id = le64_to_cpu(im->cap_id);
3337 p_cap_id = le64_to_cpu(ph->cap_id);
3338 peer = le32_to_cpu(ph->mds);
3344 dout("handle_cap_import inode %p ci %p mds%d mseq %d peer %d\n",
3345 inode, ci, mds, mseq, peer);
3348 spin_lock(&ci->i_ceph_lock);
3349 cap = __get_cap_for_mds(ci, mds);
3352 spin_unlock(&ci->i_ceph_lock);
3353 new_cap = ceph_get_cap(mdsc, NULL);
3359 ceph_put_cap(mdsc, new_cap);
3364 __ceph_caps_issued(ci, &issued);
3365 issued |= __ceph_caps_dirty(ci);
3367 ceph_add_cap(inode, session, cap_id, -1, caps, wanted, seq, mseq,
3368 realmino, CEPH_CAP_FLAG_AUTH, &new_cap);
3370 ocap = peer >= 0 ? __get_cap_for_mds(ci, peer) : NULL;
3371 if (ocap && ocap->cap_id == p_cap_id) {
3372 dout(" remove export cap %p mds%d flags %d\n",
3373 ocap, peer, ph->flags);
3374 if ((ph->flags & CEPH_CAP_FLAG_AUTH) &&
3375 (ocap->seq != le32_to_cpu(ph->seq) ||
3376 ocap->mseq != le32_to_cpu(ph->mseq))) {
3377 pr_err("handle_cap_import: mismatched seq/mseq: "
3378 "ino (%llx.%llx) mds%d seq %d mseq %d "
3379 "importer mds%d has peer seq %d mseq %d\n",
3380 ceph_vinop(inode), peer, ocap->seq,
3381 ocap->mseq, mds, le32_to_cpu(ph->seq),
3382 le32_to_cpu(ph->mseq));
3384 __ceph_remove_cap(ocap, (ph->flags & CEPH_CAP_FLAG_RELEASE));
3387 /* make sure we re-request max_size, if necessary */
3388 ci->i_wanted_max_size = 0;
3389 ci->i_requested_max_size = 0;
3391 *old_issued = issued;
3396 * Handle a caps message from the MDS.
3398 * Identify the appropriate session, inode, and call the right handler
3399 * based on the cap op.
3401 void ceph_handle_caps(struct ceph_mds_session *session,
3402 struct ceph_msg *msg)
3404 struct ceph_mds_client *mdsc = session->s_mdsc;
3405 struct super_block *sb = mdsc->fsc->sb;
3406 struct inode *inode;
3407 struct ceph_inode_info *ci;
3408 struct ceph_cap *cap;
3409 struct ceph_mds_caps *h;
3410 struct ceph_mds_cap_peer *peer = NULL;
3411 struct ceph_snap_realm *realm = NULL;
3412 struct ceph_string *pool_ns = NULL;
3413 int mds = session->s_mds;
3416 struct ceph_vino vino;
3418 u64 inline_version = 0;
3419 void *inline_data = NULL;
3422 size_t snaptrace_len;
3425 dout("handle_caps from mds%d\n", mds);
3428 end = msg->front.iov_base + msg->front.iov_len;
3429 tid = le64_to_cpu(msg->hdr.tid);
3430 if (msg->front.iov_len < sizeof(*h))
3432 h = msg->front.iov_base;
3433 op = le32_to_cpu(h->op);
3434 vino.ino = le64_to_cpu(h->ino);
3435 vino.snap = CEPH_NOSNAP;
3436 seq = le32_to_cpu(h->seq);
3437 mseq = le32_to_cpu(h->migrate_seq);
3440 snaptrace_len = le32_to_cpu(h->snap_trace_len);
3441 p = snaptrace + snaptrace_len;
3443 if (le16_to_cpu(msg->hdr.version) >= 2) {
3445 ceph_decode_32_safe(&p, end, flock_len, bad);
3446 if (p + flock_len > end)
3451 if (le16_to_cpu(msg->hdr.version) >= 3) {
3452 if (op == CEPH_CAP_OP_IMPORT) {
3453 if (p + sizeof(*peer) > end)
3457 } else if (op == CEPH_CAP_OP_EXPORT) {
3458 /* recorded in unused fields */
3459 peer = (void *)&h->size;
3463 if (le16_to_cpu(msg->hdr.version) >= 4) {
3464 ceph_decode_64_safe(&p, end, inline_version, bad);
3465 ceph_decode_32_safe(&p, end, inline_len, bad);
3466 if (p + inline_len > end)
3472 if (le16_to_cpu(msg->hdr.version) >= 8) {
3474 u32 caller_uid, caller_gid;
3475 u32 osd_epoch_barrier;
3478 ceph_decode_32_safe(&p, end, osd_epoch_barrier, bad);
3480 ceph_decode_64_safe(&p, end, flush_tid, bad);
3482 ceph_decode_32_safe(&p, end, caller_uid, bad);
3483 ceph_decode_32_safe(&p, end, caller_gid, bad);
3485 ceph_decode_32_safe(&p, end, pool_ns_len, bad);
3486 if (pool_ns_len > 0) {
3487 ceph_decode_need(&p, end, pool_ns_len, bad);
3488 pool_ns = ceph_find_or_create_string(p, pool_ns_len);
3494 inode = ceph_find_inode(sb, vino);
3495 ci = ceph_inode(inode);
3496 dout(" op %s ino %llx.%llx inode %p\n", ceph_cap_op_name(op), vino.ino,
3499 mutex_lock(&session->s_mutex);
3501 dout(" mds%d seq %lld cap seq %u\n", session->s_mds, session->s_seq,
3505 dout(" i don't have ino %llx\n", vino.ino);
3507 if (op == CEPH_CAP_OP_IMPORT) {
3508 cap = ceph_get_cap(mdsc, NULL);
3509 cap->cap_ino = vino.ino;
3510 cap->queue_release = 1;
3511 cap->cap_id = le64_to_cpu(h->cap_id);
3514 spin_lock(&session->s_cap_lock);
3515 list_add_tail(&cap->session_caps,
3516 &session->s_cap_releases);
3517 session->s_num_cap_releases++;
3518 spin_unlock(&session->s_cap_lock);
3520 goto flush_cap_releases;
3523 /* these will work even if we don't have a cap yet */
3525 case CEPH_CAP_OP_FLUSHSNAP_ACK:
3526 handle_cap_flushsnap_ack(inode, tid, h, session);
3529 case CEPH_CAP_OP_EXPORT:
3530 handle_cap_export(inode, h, peer, session);
3533 case CEPH_CAP_OP_IMPORT:
3535 if (snaptrace_len) {
3536 down_write(&mdsc->snap_rwsem);
3537 ceph_update_snap_trace(mdsc, snaptrace,
3538 snaptrace + snaptrace_len,
3540 downgrade_write(&mdsc->snap_rwsem);
3542 down_read(&mdsc->snap_rwsem);
3544 handle_cap_import(mdsc, inode, h, peer, session,
3546 handle_cap_grant(mdsc, inode, h, &pool_ns,
3547 inline_version, inline_data, inline_len,
3548 msg->middle, session, cap, issued);
3550 ceph_put_snap_realm(mdsc, realm);
3554 /* the rest require a cap */
3555 spin_lock(&ci->i_ceph_lock);
3556 cap = __get_cap_for_mds(ceph_inode(inode), mds);
3558 dout(" no cap on %p ino %llx.%llx from mds%d\n",
3559 inode, ceph_ino(inode), ceph_snap(inode), mds);
3560 spin_unlock(&ci->i_ceph_lock);
3561 goto flush_cap_releases;
3564 /* note that each of these drops i_ceph_lock for us */
3566 case CEPH_CAP_OP_REVOKE:
3567 case CEPH_CAP_OP_GRANT:
3568 __ceph_caps_issued(ci, &issued);
3569 issued |= __ceph_caps_dirty(ci);
3570 handle_cap_grant(mdsc, inode, h, &pool_ns,
3571 inline_version, inline_data, inline_len,
3572 msg->middle, session, cap, issued);
3575 case CEPH_CAP_OP_FLUSH_ACK:
3576 handle_cap_flush_ack(inode, tid, h, session, cap);
3579 case CEPH_CAP_OP_TRUNC:
3580 handle_cap_trunc(inode, h, session);
3584 spin_unlock(&ci->i_ceph_lock);
3585 pr_err("ceph_handle_caps: unknown cap op %d %s\n", op,
3586 ceph_cap_op_name(op));
3593 * send any cap release message to try to move things
3594 * along for the mds (who clearly thinks we still have this
3597 ceph_send_cap_releases(mdsc, session);
3600 mutex_unlock(&session->s_mutex);
3603 ceph_put_string(pool_ns);
3607 pr_err("ceph_handle_caps: corrupt message\n");
3613 * Delayed work handler to process end of delayed cap release LRU list.
3615 void ceph_check_delayed_caps(struct ceph_mds_client *mdsc)
3617 struct ceph_inode_info *ci;
3618 int flags = CHECK_CAPS_NODELAY;
3620 dout("check_delayed_caps\n");
3622 spin_lock(&mdsc->cap_delay_lock);
3623 if (list_empty(&mdsc->cap_delay_list))
3625 ci = list_first_entry(&mdsc->cap_delay_list,
3626 struct ceph_inode_info,
3628 if ((ci->i_ceph_flags & CEPH_I_FLUSH) == 0 &&
3629 time_before(jiffies, ci->i_hold_caps_max))
3631 list_del_init(&ci->i_cap_delay_list);
3632 spin_unlock(&mdsc->cap_delay_lock);
3633 dout("check_delayed_caps on %p\n", &ci->vfs_inode);
3634 ceph_check_caps(ci, flags, NULL);
3636 spin_unlock(&mdsc->cap_delay_lock);
3640 * Flush all dirty caps to the mds
3642 void ceph_flush_dirty_caps(struct ceph_mds_client *mdsc)
3644 struct ceph_inode_info *ci;
3645 struct inode *inode;
3647 dout("flush_dirty_caps\n");
3648 spin_lock(&mdsc->cap_dirty_lock);
3649 while (!list_empty(&mdsc->cap_dirty)) {
3650 ci = list_first_entry(&mdsc->cap_dirty, struct ceph_inode_info,
3652 inode = &ci->vfs_inode;
3654 dout("flush_dirty_caps %p\n", inode);
3655 spin_unlock(&mdsc->cap_dirty_lock);
3656 ceph_check_caps(ci, CHECK_CAPS_NODELAY|CHECK_CAPS_FLUSH, NULL);
3658 spin_lock(&mdsc->cap_dirty_lock);
3660 spin_unlock(&mdsc->cap_dirty_lock);
3661 dout("flush_dirty_caps done\n");
3664 void __ceph_get_fmode(struct ceph_inode_info *ci, int fmode)
3667 int bits = (fmode << 1) | 1;
3668 for (i = 0; i < CEPH_FILE_MODE_BITS; i++) {
3669 if (bits & (1 << i))
3670 ci->i_nr_by_mode[i]++;
3675 * Drop open file reference. If we were the last open file,
3676 * we may need to release capabilities to the MDS (or schedule
3677 * their delayed release).
3679 void ceph_put_fmode(struct ceph_inode_info *ci, int fmode)
3682 int bits = (fmode << 1) | 1;
3683 spin_lock(&ci->i_ceph_lock);
3684 for (i = 0; i < CEPH_FILE_MODE_BITS; i++) {
3685 if (bits & (1 << i)) {
3686 BUG_ON(ci->i_nr_by_mode[i] == 0);
3687 if (--ci->i_nr_by_mode[i] == 0)
3691 dout("put_fmode %p fmode %d {%d,%d,%d,%d}\n",
3692 &ci->vfs_inode, fmode,
3693 ci->i_nr_by_mode[0], ci->i_nr_by_mode[1],
3694 ci->i_nr_by_mode[2], ci->i_nr_by_mode[3]);
3695 spin_unlock(&ci->i_ceph_lock);
3697 if (last && ci->i_vino.snap == CEPH_NOSNAP)
3698 ceph_check_caps(ci, 0, NULL);
3702 * Helpers for embedding cap and dentry lease releases into mds
3705 * @force is used by dentry_release (below) to force inclusion of a
3706 * record for the directory inode, even when there aren't any caps to
3709 int ceph_encode_inode_release(void **p, struct inode *inode,
3710 int mds, int drop, int unless, int force)
3712 struct ceph_inode_info *ci = ceph_inode(inode);
3713 struct ceph_cap *cap;
3714 struct ceph_mds_request_release *rel = *p;
3718 spin_lock(&ci->i_ceph_lock);
3719 used = __ceph_caps_used(ci);
3720 dirty = __ceph_caps_dirty(ci);
3722 dout("encode_inode_release %p mds%d used|dirty %s drop %s unless %s\n",
3723 inode, mds, ceph_cap_string(used|dirty), ceph_cap_string(drop),
3724 ceph_cap_string(unless));
3726 /* only drop unused, clean caps */
3727 drop &= ~(used | dirty);
3729 cap = __get_cap_for_mds(ci, mds);
3730 if (cap && __cap_is_valid(cap)) {
3732 ((cap->issued & drop) &&
3733 (cap->issued & unless) == 0)) {
3734 if ((cap->issued & drop) &&
3735 (cap->issued & unless) == 0) {
3736 int wanted = __ceph_caps_wanted(ci);
3737 if ((ci->i_ceph_flags & CEPH_I_NODELAY) == 0)
3738 wanted |= cap->mds_wanted;
3739 dout("encode_inode_release %p cap %p "
3740 "%s -> %s, wanted %s -> %s\n", inode, cap,
3741 ceph_cap_string(cap->issued),
3742 ceph_cap_string(cap->issued & ~drop),
3743 ceph_cap_string(cap->mds_wanted),
3744 ceph_cap_string(wanted));
3746 cap->issued &= ~drop;
3747 cap->implemented &= ~drop;
3748 cap->mds_wanted = wanted;
3750 dout("encode_inode_release %p cap %p %s"
3751 " (force)\n", inode, cap,
3752 ceph_cap_string(cap->issued));
3755 rel->ino = cpu_to_le64(ceph_ino(inode));
3756 rel->cap_id = cpu_to_le64(cap->cap_id);
3757 rel->seq = cpu_to_le32(cap->seq);
3758 rel->issue_seq = cpu_to_le32(cap->issue_seq);
3759 rel->mseq = cpu_to_le32(cap->mseq);
3760 rel->caps = cpu_to_le32(cap->implemented);
3761 rel->wanted = cpu_to_le32(cap->mds_wanted);
3767 dout("encode_inode_release %p cap %p %s\n",
3768 inode, cap, ceph_cap_string(cap->issued));
3771 spin_unlock(&ci->i_ceph_lock);
3775 int ceph_encode_dentry_release(void **p, struct dentry *dentry,
3776 int mds, int drop, int unless)
3778 struct inode *dir = d_inode(dentry->d_parent);
3779 struct ceph_mds_request_release *rel = *p;
3780 struct ceph_dentry_info *di = ceph_dentry(dentry);
3785 * force an record for the directory caps if we have a dentry lease.
3786 * this is racy (can't take i_ceph_lock and d_lock together), but it
3787 * doesn't have to be perfect; the mds will revoke anything we don't
3790 spin_lock(&dentry->d_lock);
3791 if (di->lease_session && di->lease_session->s_mds == mds)
3793 spin_unlock(&dentry->d_lock);
3795 ret = ceph_encode_inode_release(p, dir, mds, drop, unless, force);
3797 spin_lock(&dentry->d_lock);
3798 if (ret && di->lease_session && di->lease_session->s_mds == mds) {
3799 dout("encode_dentry_release %p mds%d seq %d\n",
3800 dentry, mds, (int)di->lease_seq);
3801 rel->dname_len = cpu_to_le32(dentry->d_name.len);
3802 memcpy(*p, dentry->d_name.name, dentry->d_name.len);
3803 *p += dentry->d_name.len;
3804 rel->dname_seq = cpu_to_le32(di->lease_seq);
3805 __ceph_mdsc_drop_dentry_lease(dentry);
3807 spin_unlock(&dentry->d_lock);