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"
13 #include <linux/ceph/decode.h>
14 #include <linux/ceph/messenger.h>
17 * Capability management
19 * The Ceph metadata servers control client access to inode metadata
20 * and file data by issuing capabilities, granting clients permission
21 * to read and/or write both inode field and file data to OSDs
22 * (storage nodes). Each capability consists of a set of bits
23 * indicating which operations are allowed.
25 * If the client holds a *_SHARED cap, the client has a coherent value
26 * that can be safely read from the cached inode.
28 * In the case of a *_EXCL (exclusive) or FILE_WR capabilities, the
29 * client is allowed to change inode attributes (e.g., file size,
30 * mtime), note its dirty state in the ceph_cap, and asynchronously
31 * flush that metadata change to the MDS.
33 * In the event of a conflicting operation (perhaps by another
34 * client), the MDS will revoke the conflicting client capabilities.
36 * In order for a client to cache an inode, it must hold a capability
37 * with at least one MDS server. When inodes are released, release
38 * notifications are batched and periodically sent en masse to the MDS
39 * cluster to release server state.
44 * Generate readable cap strings for debugging output.
46 #define MAX_CAP_STR 20
47 static char cap_str[MAX_CAP_STR][40];
48 static DEFINE_SPINLOCK(cap_str_lock);
49 static int last_cap_str;
51 static char *gcap_string(char *s, int c)
53 if (c & CEPH_CAP_GSHARED)
55 if (c & CEPH_CAP_GEXCL)
57 if (c & CEPH_CAP_GCACHE)
63 if (c & CEPH_CAP_GBUFFER)
65 if (c & CEPH_CAP_GLAZYIO)
70 const char *ceph_cap_string(int caps)
76 spin_lock(&cap_str_lock);
78 if (last_cap_str == MAX_CAP_STR)
80 spin_unlock(&cap_str_lock);
84 if (caps & CEPH_CAP_PIN)
87 c = (caps >> CEPH_CAP_SAUTH) & 3;
90 s = gcap_string(s, c);
93 c = (caps >> CEPH_CAP_SLINK) & 3;
96 s = gcap_string(s, c);
99 c = (caps >> CEPH_CAP_SXATTR) & 3;
102 s = gcap_string(s, c);
105 c = caps >> CEPH_CAP_SFILE;
108 s = gcap_string(s, c);
117 void ceph_caps_init(struct ceph_mds_client *mdsc)
119 INIT_LIST_HEAD(&mdsc->caps_list);
120 spin_lock_init(&mdsc->caps_list_lock);
123 void ceph_caps_finalize(struct ceph_mds_client *mdsc)
125 struct ceph_cap *cap;
127 spin_lock(&mdsc->caps_list_lock);
128 while (!list_empty(&mdsc->caps_list)) {
129 cap = list_first_entry(&mdsc->caps_list,
130 struct ceph_cap, caps_item);
131 list_del(&cap->caps_item);
132 kmem_cache_free(ceph_cap_cachep, cap);
134 mdsc->caps_total_count = 0;
135 mdsc->caps_avail_count = 0;
136 mdsc->caps_use_count = 0;
137 mdsc->caps_reserve_count = 0;
138 mdsc->caps_min_count = 0;
139 spin_unlock(&mdsc->caps_list_lock);
142 void ceph_adjust_min_caps(struct ceph_mds_client *mdsc, int delta)
144 spin_lock(&mdsc->caps_list_lock);
145 mdsc->caps_min_count += delta;
146 BUG_ON(mdsc->caps_min_count < 0);
147 spin_unlock(&mdsc->caps_list_lock);
150 void ceph_reserve_caps(struct ceph_mds_client *mdsc,
151 struct ceph_cap_reservation *ctx, int need)
154 struct ceph_cap *cap;
159 dout("reserve caps ctx=%p need=%d\n", ctx, need);
161 /* first reserve any caps that are already allocated */
162 spin_lock(&mdsc->caps_list_lock);
163 if (mdsc->caps_avail_count >= need)
166 have = mdsc->caps_avail_count;
167 mdsc->caps_avail_count -= have;
168 mdsc->caps_reserve_count += have;
169 BUG_ON(mdsc->caps_total_count != mdsc->caps_use_count +
170 mdsc->caps_reserve_count +
171 mdsc->caps_avail_count);
172 spin_unlock(&mdsc->caps_list_lock);
174 for (i = have; i < need; i++) {
175 cap = kmem_cache_alloc(ceph_cap_cachep, GFP_NOFS);
178 list_add(&cap->caps_item, &newcaps);
181 /* we didn't manage to reserve as much as we needed */
182 if (have + alloc != need)
183 pr_warn("reserve caps ctx=%p ENOMEM need=%d got=%d\n",
184 ctx, need, have + alloc);
186 spin_lock(&mdsc->caps_list_lock);
187 mdsc->caps_total_count += alloc;
188 mdsc->caps_reserve_count += alloc;
189 list_splice(&newcaps, &mdsc->caps_list);
191 BUG_ON(mdsc->caps_total_count != mdsc->caps_use_count +
192 mdsc->caps_reserve_count +
193 mdsc->caps_avail_count);
194 spin_unlock(&mdsc->caps_list_lock);
197 dout("reserve caps ctx=%p %d = %d used + %d resv + %d avail\n",
198 ctx, mdsc->caps_total_count, mdsc->caps_use_count,
199 mdsc->caps_reserve_count, mdsc->caps_avail_count);
202 int ceph_unreserve_caps(struct ceph_mds_client *mdsc,
203 struct ceph_cap_reservation *ctx)
205 dout("unreserve caps ctx=%p count=%d\n", ctx, ctx->count);
207 spin_lock(&mdsc->caps_list_lock);
208 BUG_ON(mdsc->caps_reserve_count < ctx->count);
209 mdsc->caps_reserve_count -= ctx->count;
210 mdsc->caps_avail_count += ctx->count;
212 dout("unreserve caps %d = %d used + %d resv + %d avail\n",
213 mdsc->caps_total_count, mdsc->caps_use_count,
214 mdsc->caps_reserve_count, mdsc->caps_avail_count);
215 BUG_ON(mdsc->caps_total_count != mdsc->caps_use_count +
216 mdsc->caps_reserve_count +
217 mdsc->caps_avail_count);
218 spin_unlock(&mdsc->caps_list_lock);
223 static struct ceph_cap *get_cap(struct ceph_mds_client *mdsc,
224 struct ceph_cap_reservation *ctx)
226 struct ceph_cap *cap = NULL;
228 /* temporary, until we do something about cap import/export */
230 cap = kmem_cache_alloc(ceph_cap_cachep, GFP_NOFS);
232 spin_lock(&mdsc->caps_list_lock);
233 mdsc->caps_use_count++;
234 mdsc->caps_total_count++;
235 spin_unlock(&mdsc->caps_list_lock);
240 spin_lock(&mdsc->caps_list_lock);
241 dout("get_cap ctx=%p (%d) %d = %d used + %d resv + %d avail\n",
242 ctx, ctx->count, mdsc->caps_total_count, mdsc->caps_use_count,
243 mdsc->caps_reserve_count, mdsc->caps_avail_count);
245 BUG_ON(ctx->count > mdsc->caps_reserve_count);
246 BUG_ON(list_empty(&mdsc->caps_list));
249 mdsc->caps_reserve_count--;
250 mdsc->caps_use_count++;
252 cap = list_first_entry(&mdsc->caps_list, struct ceph_cap, caps_item);
253 list_del(&cap->caps_item);
255 BUG_ON(mdsc->caps_total_count != mdsc->caps_use_count +
256 mdsc->caps_reserve_count + mdsc->caps_avail_count);
257 spin_unlock(&mdsc->caps_list_lock);
261 void ceph_put_cap(struct ceph_mds_client *mdsc, struct ceph_cap *cap)
263 spin_lock(&mdsc->caps_list_lock);
264 dout("put_cap %p %d = %d used + %d resv + %d avail\n",
265 cap, mdsc->caps_total_count, mdsc->caps_use_count,
266 mdsc->caps_reserve_count, mdsc->caps_avail_count);
267 mdsc->caps_use_count--;
269 * Keep some preallocated caps around (ceph_min_count), to
270 * avoid lots of free/alloc churn.
272 if (mdsc->caps_avail_count >= mdsc->caps_reserve_count +
273 mdsc->caps_min_count) {
274 mdsc->caps_total_count--;
275 kmem_cache_free(ceph_cap_cachep, cap);
277 mdsc->caps_avail_count++;
278 list_add(&cap->caps_item, &mdsc->caps_list);
281 BUG_ON(mdsc->caps_total_count != mdsc->caps_use_count +
282 mdsc->caps_reserve_count + mdsc->caps_avail_count);
283 spin_unlock(&mdsc->caps_list_lock);
286 void ceph_reservation_status(struct ceph_fs_client *fsc,
287 int *total, int *avail, int *used, int *reserved,
290 struct ceph_mds_client *mdsc = fsc->mdsc;
293 *total = mdsc->caps_total_count;
295 *avail = mdsc->caps_avail_count;
297 *used = mdsc->caps_use_count;
299 *reserved = mdsc->caps_reserve_count;
301 *min = mdsc->caps_min_count;
305 * Find ceph_cap for given mds, if any.
307 * Called with i_ceph_lock held.
309 static struct ceph_cap *__get_cap_for_mds(struct ceph_inode_info *ci, int mds)
311 struct ceph_cap *cap;
312 struct rb_node *n = ci->i_caps.rb_node;
315 cap = rb_entry(n, struct ceph_cap, ci_node);
318 else if (mds > cap->mds)
326 struct ceph_cap *ceph_get_cap_for_mds(struct ceph_inode_info *ci, int mds)
328 struct ceph_cap *cap;
330 spin_lock(&ci->i_ceph_lock);
331 cap = __get_cap_for_mds(ci, mds);
332 spin_unlock(&ci->i_ceph_lock);
337 * Return id of any MDS with a cap, preferably FILE_WR|BUFFER|EXCL, else -1.
339 static int __ceph_get_cap_mds(struct ceph_inode_info *ci)
341 struct ceph_cap *cap;
345 /* prefer mds with WR|BUFFER|EXCL caps */
346 for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
347 cap = rb_entry(p, struct ceph_cap, ci_node);
349 if (cap->issued & (CEPH_CAP_FILE_WR |
350 CEPH_CAP_FILE_BUFFER |
357 int ceph_get_cap_mds(struct inode *inode)
359 struct ceph_inode_info *ci = ceph_inode(inode);
361 spin_lock(&ci->i_ceph_lock);
362 mds = __ceph_get_cap_mds(ceph_inode(inode));
363 spin_unlock(&ci->i_ceph_lock);
368 * Called under i_ceph_lock.
370 static void __insert_cap_node(struct ceph_inode_info *ci,
371 struct ceph_cap *new)
373 struct rb_node **p = &ci->i_caps.rb_node;
374 struct rb_node *parent = NULL;
375 struct ceph_cap *cap = NULL;
379 cap = rb_entry(parent, struct ceph_cap, ci_node);
380 if (new->mds < cap->mds)
382 else if (new->mds > cap->mds)
388 rb_link_node(&new->ci_node, parent, p);
389 rb_insert_color(&new->ci_node, &ci->i_caps);
393 * (re)set cap hold timeouts, which control the delayed release
394 * of unused caps back to the MDS. Should be called on cap use.
396 static void __cap_set_timeouts(struct ceph_mds_client *mdsc,
397 struct ceph_inode_info *ci)
399 struct ceph_mount_options *ma = mdsc->fsc->mount_options;
401 ci->i_hold_caps_min = round_jiffies(jiffies +
402 ma->caps_wanted_delay_min * HZ);
403 ci->i_hold_caps_max = round_jiffies(jiffies +
404 ma->caps_wanted_delay_max * HZ);
405 dout("__cap_set_timeouts %p min %lu max %lu\n", &ci->vfs_inode,
406 ci->i_hold_caps_min - jiffies, ci->i_hold_caps_max - jiffies);
410 * (Re)queue cap at the end of the delayed cap release list.
412 * If I_FLUSH is set, leave the inode at the front of the list.
414 * Caller holds i_ceph_lock
415 * -> we take mdsc->cap_delay_lock
417 static void __cap_delay_requeue(struct ceph_mds_client *mdsc,
418 struct ceph_inode_info *ci)
420 __cap_set_timeouts(mdsc, ci);
421 dout("__cap_delay_requeue %p flags %d at %lu\n", &ci->vfs_inode,
422 ci->i_ceph_flags, ci->i_hold_caps_max);
423 if (!mdsc->stopping) {
424 spin_lock(&mdsc->cap_delay_lock);
425 if (!list_empty(&ci->i_cap_delay_list)) {
426 if (ci->i_ceph_flags & CEPH_I_FLUSH)
428 list_del_init(&ci->i_cap_delay_list);
430 list_add_tail(&ci->i_cap_delay_list, &mdsc->cap_delay_list);
432 spin_unlock(&mdsc->cap_delay_lock);
437 * Queue an inode for immediate writeback. Mark inode with I_FLUSH,
438 * indicating we should send a cap message to flush dirty metadata
439 * asap, and move to the front of the delayed cap list.
441 static void __cap_delay_requeue_front(struct ceph_mds_client *mdsc,
442 struct ceph_inode_info *ci)
444 dout("__cap_delay_requeue_front %p\n", &ci->vfs_inode);
445 spin_lock(&mdsc->cap_delay_lock);
446 ci->i_ceph_flags |= CEPH_I_FLUSH;
447 if (!list_empty(&ci->i_cap_delay_list))
448 list_del_init(&ci->i_cap_delay_list);
449 list_add(&ci->i_cap_delay_list, &mdsc->cap_delay_list);
450 spin_unlock(&mdsc->cap_delay_lock);
454 * Cancel delayed work on cap.
456 * Caller must hold i_ceph_lock.
458 static void __cap_delay_cancel(struct ceph_mds_client *mdsc,
459 struct ceph_inode_info *ci)
461 dout("__cap_delay_cancel %p\n", &ci->vfs_inode);
462 if (list_empty(&ci->i_cap_delay_list))
464 spin_lock(&mdsc->cap_delay_lock);
465 list_del_init(&ci->i_cap_delay_list);
466 spin_unlock(&mdsc->cap_delay_lock);
470 * Common issue checks for add_cap, handle_cap_grant.
472 static void __check_cap_issue(struct ceph_inode_info *ci, struct ceph_cap *cap,
475 unsigned had = __ceph_caps_issued(ci, NULL);
478 * Each time we receive FILE_CACHE anew, we increment
481 if ((issued & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) &&
482 (had & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) == 0)
486 * if we are newly issued FILE_SHARED, mark dir not complete; we
487 * don't know what happened to this directory while we didn't
490 if ((issued & CEPH_CAP_FILE_SHARED) &&
491 (had & CEPH_CAP_FILE_SHARED) == 0) {
493 if (S_ISDIR(ci->vfs_inode.i_mode)) {
494 dout(" marking %p NOT complete\n", &ci->vfs_inode);
495 __ceph_dir_clear_complete(ci);
501 * Add a capability under the given MDS session.
503 * Caller should hold session snap_rwsem (read) and s_mutex.
505 * @fmode is the open file mode, if we are opening a file, otherwise
506 * it is < 0. (This is so we can atomically add the cap and add an
507 * open file reference to it.)
509 int ceph_add_cap(struct inode *inode,
510 struct ceph_mds_session *session, u64 cap_id,
511 int fmode, unsigned issued, unsigned wanted,
512 unsigned seq, unsigned mseq, u64 realmino, int flags,
513 struct ceph_cap_reservation *caps_reservation)
515 struct ceph_mds_client *mdsc = ceph_inode_to_client(inode)->mdsc;
516 struct ceph_inode_info *ci = ceph_inode(inode);
517 struct ceph_cap *new_cap = NULL;
518 struct ceph_cap *cap;
519 int mds = session->s_mds;
522 dout("add_cap %p mds%d cap %llx %s seq %d\n", inode,
523 session->s_mds, cap_id, ceph_cap_string(issued), seq);
526 * If we are opening the file, include file mode wanted bits
530 wanted |= ceph_caps_for_mode(fmode);
533 spin_lock(&ci->i_ceph_lock);
534 cap = __get_cap_for_mds(ci, mds);
540 spin_unlock(&ci->i_ceph_lock);
541 new_cap = get_cap(mdsc, caps_reservation);
548 cap->implemented = 0;
554 __insert_cap_node(ci, cap);
556 /* clear out old exporting info? (i.e. on cap import) */
557 if (ci->i_cap_exporting_mds == mds) {
558 ci->i_cap_exporting_issued = 0;
559 ci->i_cap_exporting_mseq = 0;
560 ci->i_cap_exporting_mds = -1;
563 /* add to session cap list */
564 cap->session = session;
565 spin_lock(&session->s_cap_lock);
566 list_add_tail(&cap->session_caps, &session->s_caps);
567 session->s_nr_caps++;
568 spin_unlock(&session->s_cap_lock);
570 ceph_put_cap(mdsc, new_cap);
572 if (!ci->i_snap_realm) {
574 * add this inode to the appropriate snap realm
576 struct ceph_snap_realm *realm = ceph_lookup_snap_realm(mdsc,
579 ceph_get_snap_realm(mdsc, realm);
580 spin_lock(&realm->inodes_with_caps_lock);
581 ci->i_snap_realm = realm;
582 list_add(&ci->i_snap_realm_item,
583 &realm->inodes_with_caps);
584 spin_unlock(&realm->inodes_with_caps_lock);
586 pr_err("ceph_add_cap: couldn't find snap realm %llx\n",
592 __check_cap_issue(ci, cap, issued);
595 * If we are issued caps we don't want, or the mds' wanted
596 * value appears to be off, queue a check so we'll release
597 * later and/or update the mds wanted value.
599 actual_wanted = __ceph_caps_wanted(ci);
600 if ((wanted & ~actual_wanted) ||
601 (issued & ~actual_wanted & CEPH_CAP_ANY_WR)) {
602 dout(" issued %s, mds wanted %s, actual %s, queueing\n",
603 ceph_cap_string(issued), ceph_cap_string(wanted),
604 ceph_cap_string(actual_wanted));
605 __cap_delay_requeue(mdsc, ci);
608 if (flags & CEPH_CAP_FLAG_AUTH) {
609 if (ci->i_auth_cap == NULL ||
610 ceph_seq_cmp(ci->i_auth_cap->mseq, mseq) < 0)
611 ci->i_auth_cap = cap;
612 } else if (ci->i_auth_cap == cap) {
613 ci->i_auth_cap = NULL;
614 spin_lock(&mdsc->cap_dirty_lock);
615 if (!list_empty(&ci->i_dirty_item)) {
616 dout(" moving %p to cap_dirty_migrating\n", inode);
617 list_move(&ci->i_dirty_item,
618 &mdsc->cap_dirty_migrating);
620 spin_unlock(&mdsc->cap_dirty_lock);
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 (mseq > cap->mseq)
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);
640 spin_unlock(&ci->i_ceph_lock);
641 wake_up_all(&ci->i_cap_wq);
646 * Return true if cap has not timed out and belongs to the current
647 * generation of the MDS session (i.e. has not gone 'stale' due to
648 * us losing touch with the mds).
650 static int __cap_is_valid(struct ceph_cap *cap)
655 spin_lock(&cap->session->s_gen_ttl_lock);
656 gen = cap->session->s_cap_gen;
657 ttl = cap->session->s_cap_ttl;
658 spin_unlock(&cap->session->s_gen_ttl_lock);
660 if (cap->cap_gen < gen || time_after_eq(jiffies, ttl)) {
661 dout("__cap_is_valid %p cap %p issued %s "
662 "but STALE (gen %u vs %u)\n", &cap->ci->vfs_inode,
663 cap, ceph_cap_string(cap->issued), cap->cap_gen, gen);
671 * Return set of valid cap bits issued to us. Note that caps time
672 * out, and may be invalidated in bulk if the client session times out
673 * and session->s_cap_gen is bumped.
675 int __ceph_caps_issued(struct ceph_inode_info *ci, int *implemented)
677 int have = ci->i_snap_caps | ci->i_cap_exporting_issued;
678 struct ceph_cap *cap;
683 for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
684 cap = rb_entry(p, struct ceph_cap, ci_node);
685 if (!__cap_is_valid(cap))
687 dout("__ceph_caps_issued %p cap %p issued %s\n",
688 &ci->vfs_inode, cap, ceph_cap_string(cap->issued));
691 *implemented |= cap->implemented;
697 * Get cap bits issued by caps other than @ocap
699 int __ceph_caps_issued_other(struct ceph_inode_info *ci, struct ceph_cap *ocap)
701 int have = ci->i_snap_caps;
702 struct ceph_cap *cap;
705 for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
706 cap = rb_entry(p, struct ceph_cap, ci_node);
709 if (!__cap_is_valid(cap))
717 * Move a cap to the end of the LRU (oldest caps at list head, newest
720 static void __touch_cap(struct ceph_cap *cap)
722 struct ceph_mds_session *s = cap->session;
724 spin_lock(&s->s_cap_lock);
725 if (s->s_cap_iterator == NULL) {
726 dout("__touch_cap %p cap %p mds%d\n", &cap->ci->vfs_inode, cap,
728 list_move_tail(&cap->session_caps, &s->s_caps);
730 dout("__touch_cap %p cap %p mds%d NOP, iterating over caps\n",
731 &cap->ci->vfs_inode, cap, s->s_mds);
733 spin_unlock(&s->s_cap_lock);
737 * Check if we hold the given mask. If so, move the cap(s) to the
738 * front of their respective LRUs. (This is the preferred way for
739 * callers to check for caps they want.)
741 int __ceph_caps_issued_mask(struct ceph_inode_info *ci, int mask, int touch)
743 struct ceph_cap *cap;
745 int have = ci->i_snap_caps;
747 if ((have & mask) == mask) {
748 dout("__ceph_caps_issued_mask %p snap issued %s"
749 " (mask %s)\n", &ci->vfs_inode,
750 ceph_cap_string(have),
751 ceph_cap_string(mask));
755 for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
756 cap = rb_entry(p, struct ceph_cap, ci_node);
757 if (!__cap_is_valid(cap))
759 if ((cap->issued & mask) == mask) {
760 dout("__ceph_caps_issued_mask %p cap %p issued %s"
761 " (mask %s)\n", &ci->vfs_inode, cap,
762 ceph_cap_string(cap->issued),
763 ceph_cap_string(mask));
769 /* does a combination of caps satisfy mask? */
771 if ((have & mask) == mask) {
772 dout("__ceph_caps_issued_mask %p combo issued %s"
773 " (mask %s)\n", &ci->vfs_inode,
774 ceph_cap_string(cap->issued),
775 ceph_cap_string(mask));
779 /* touch this + preceding caps */
781 for (q = rb_first(&ci->i_caps); q != p;
783 cap = rb_entry(q, struct ceph_cap,
785 if (!__cap_is_valid(cap))
798 * Return true if mask caps are currently being revoked by an MDS.
800 int ceph_caps_revoking(struct ceph_inode_info *ci, int mask)
802 struct inode *inode = &ci->vfs_inode;
803 struct ceph_cap *cap;
807 spin_lock(&ci->i_ceph_lock);
808 for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
809 cap = rb_entry(p, struct ceph_cap, ci_node);
810 if (__cap_is_valid(cap) &&
811 (cap->implemented & ~cap->issued & mask)) {
816 spin_unlock(&ci->i_ceph_lock);
817 dout("ceph_caps_revoking %p %s = %d\n", inode,
818 ceph_cap_string(mask), ret);
822 int __ceph_caps_used(struct ceph_inode_info *ci)
826 used |= CEPH_CAP_PIN;
828 used |= CEPH_CAP_FILE_RD;
829 if (ci->i_rdcache_ref || ci->vfs_inode.i_data.nrpages)
830 used |= CEPH_CAP_FILE_CACHE;
832 used |= CEPH_CAP_FILE_WR;
833 if (ci->i_wb_ref || ci->i_wrbuffer_ref)
834 used |= CEPH_CAP_FILE_BUFFER;
839 * wanted, by virtue of open file modes
841 int __ceph_caps_file_wanted(struct ceph_inode_info *ci)
845 for (mode = 0; mode < CEPH_FILE_MODE_NUM; mode++)
846 if (ci->i_nr_by_mode[mode])
847 want |= ceph_caps_for_mode(mode);
852 * Return caps we have registered with the MDS(s) as 'wanted'.
854 int __ceph_caps_mds_wanted(struct ceph_inode_info *ci)
856 struct ceph_cap *cap;
860 for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
861 cap = rb_entry(p, struct ceph_cap, ci_node);
862 if (!__cap_is_valid(cap))
864 mds_wanted |= cap->mds_wanted;
870 * called under i_ceph_lock
872 static int __ceph_is_any_caps(struct ceph_inode_info *ci)
874 return !RB_EMPTY_ROOT(&ci->i_caps) || ci->i_cap_exporting_mds >= 0;
878 * Remove a cap. Take steps to deal with a racing iterate_session_caps.
880 * caller should hold i_ceph_lock.
881 * caller will not hold session s_mutex if called from destroy_inode.
883 void __ceph_remove_cap(struct ceph_cap *cap)
885 struct ceph_mds_session *session = cap->session;
886 struct ceph_inode_info *ci = cap->ci;
887 struct ceph_mds_client *mdsc =
888 ceph_sb_to_client(ci->vfs_inode.i_sb)->mdsc;
891 dout("__ceph_remove_cap %p from %p\n", cap, &ci->vfs_inode);
893 /* remove from session list */
894 spin_lock(&session->s_cap_lock);
895 if (session->s_cap_iterator == cap) {
896 /* not yet, we are iterating over this very cap */
897 dout("__ceph_remove_cap delaying %p removal from session %p\n",
900 list_del_init(&cap->session_caps);
901 session->s_nr_caps--;
905 /* protect backpointer with s_cap_lock: see iterate_session_caps */
907 spin_unlock(&session->s_cap_lock);
909 /* remove from inode list */
910 rb_erase(&cap->ci_node, &ci->i_caps);
911 if (ci->i_auth_cap == cap)
912 ci->i_auth_cap = NULL;
915 ceph_put_cap(mdsc, cap);
917 if (!__ceph_is_any_caps(ci) && ci->i_snap_realm) {
918 struct ceph_snap_realm *realm = ci->i_snap_realm;
919 spin_lock(&realm->inodes_with_caps_lock);
920 list_del_init(&ci->i_snap_realm_item);
921 ci->i_snap_realm_counter++;
922 ci->i_snap_realm = NULL;
923 spin_unlock(&realm->inodes_with_caps_lock);
924 ceph_put_snap_realm(mdsc, realm);
926 if (!__ceph_is_any_real_caps(ci))
927 __cap_delay_cancel(mdsc, ci);
931 * Build and send a cap message to the given MDS.
933 * Caller should be holding s_mutex.
935 static int send_cap_msg(struct ceph_mds_session *session,
936 u64 ino, u64 cid, int op,
937 int caps, int wanted, int dirty,
938 u32 seq, u64 flush_tid, u32 issue_seq, u32 mseq,
939 u64 size, u64 max_size,
940 struct timespec *mtime, struct timespec *atime,
942 kuid_t uid, kgid_t gid, umode_t mode,
944 struct ceph_buffer *xattrs_buf,
947 struct ceph_mds_caps *fc;
948 struct ceph_msg *msg;
950 dout("send_cap_msg %s %llx %llx caps %s wanted %s dirty %s"
951 " seq %u/%u mseq %u follows %lld size %llu/%llu"
952 " xattr_ver %llu xattr_len %d\n", ceph_cap_op_name(op),
953 cid, ino, ceph_cap_string(caps), ceph_cap_string(wanted),
954 ceph_cap_string(dirty),
955 seq, issue_seq, mseq, follows, size, max_size,
956 xattr_version, xattrs_buf ? (int)xattrs_buf->vec.iov_len : 0);
958 msg = ceph_msg_new(CEPH_MSG_CLIENT_CAPS, sizeof(*fc), GFP_NOFS, false);
962 msg->hdr.tid = cpu_to_le64(flush_tid);
964 fc = msg->front.iov_base;
965 memset(fc, 0, sizeof(*fc));
967 fc->cap_id = cpu_to_le64(cid);
968 fc->op = cpu_to_le32(op);
969 fc->seq = cpu_to_le32(seq);
970 fc->issue_seq = cpu_to_le32(issue_seq);
971 fc->migrate_seq = cpu_to_le32(mseq);
972 fc->caps = cpu_to_le32(caps);
973 fc->wanted = cpu_to_le32(wanted);
974 fc->dirty = cpu_to_le32(dirty);
975 fc->ino = cpu_to_le64(ino);
976 fc->snap_follows = cpu_to_le64(follows);
978 fc->size = cpu_to_le64(size);
979 fc->max_size = cpu_to_le64(max_size);
981 ceph_encode_timespec(&fc->mtime, mtime);
983 ceph_encode_timespec(&fc->atime, atime);
984 fc->time_warp_seq = cpu_to_le32(time_warp_seq);
986 fc->uid = cpu_to_le32(from_kuid(&init_user_ns, uid));
987 fc->gid = cpu_to_le32(from_kgid(&init_user_ns, gid));
988 fc->mode = cpu_to_le32(mode);
990 fc->xattr_version = cpu_to_le64(xattr_version);
992 msg->middle = ceph_buffer_get(xattrs_buf);
993 fc->xattr_len = cpu_to_le32(xattrs_buf->vec.iov_len);
994 msg->hdr.middle_len = cpu_to_le32(xattrs_buf->vec.iov_len);
997 ceph_con_send(&session->s_con, msg);
1001 void __queue_cap_release(struct ceph_mds_session *session,
1002 u64 ino, u64 cap_id, u32 migrate_seq,
1005 struct ceph_msg *msg;
1006 struct ceph_mds_cap_release *head;
1007 struct ceph_mds_cap_item *item;
1009 spin_lock(&session->s_cap_lock);
1010 BUG_ON(!session->s_num_cap_releases);
1011 msg = list_first_entry(&session->s_cap_releases,
1012 struct ceph_msg, list_head);
1014 dout(" adding %llx release to mds%d msg %p (%d left)\n",
1015 ino, session->s_mds, msg, session->s_num_cap_releases);
1017 BUG_ON(msg->front.iov_len + sizeof(*item) > PAGE_CACHE_SIZE);
1018 head = msg->front.iov_base;
1019 le32_add_cpu(&head->num, 1);
1020 item = msg->front.iov_base + msg->front.iov_len;
1021 item->ino = cpu_to_le64(ino);
1022 item->cap_id = cpu_to_le64(cap_id);
1023 item->migrate_seq = cpu_to_le32(migrate_seq);
1024 item->seq = cpu_to_le32(issue_seq);
1026 session->s_num_cap_releases--;
1028 msg->front.iov_len += sizeof(*item);
1029 if (le32_to_cpu(head->num) == CEPH_CAPS_PER_RELEASE) {
1030 dout(" release msg %p full\n", msg);
1031 list_move_tail(&msg->list_head, &session->s_cap_releases_done);
1033 dout(" release msg %p at %d/%d (%d)\n", msg,
1034 (int)le32_to_cpu(head->num),
1035 (int)CEPH_CAPS_PER_RELEASE,
1036 (int)msg->front.iov_len);
1038 spin_unlock(&session->s_cap_lock);
1042 * Queue cap releases when an inode is dropped from our cache. Since
1043 * inode is about to be destroyed, there is no need for i_ceph_lock.
1045 void ceph_queue_caps_release(struct inode *inode)
1047 struct ceph_inode_info *ci = ceph_inode(inode);
1050 p = rb_first(&ci->i_caps);
1052 struct ceph_cap *cap = rb_entry(p, struct ceph_cap, ci_node);
1053 struct ceph_mds_session *session = cap->session;
1055 __queue_cap_release(session, ceph_ino(inode), cap->cap_id,
1056 cap->mseq, cap->issue_seq);
1058 __ceph_remove_cap(cap);
1063 * Send a cap msg on the given inode. Update our caps state, then
1064 * drop i_ceph_lock and send the message.
1066 * Make note of max_size reported/requested from mds, revoked caps
1067 * that have now been implemented.
1069 * Make half-hearted attempt ot to invalidate page cache if we are
1070 * dropping RDCACHE. Note that this will leave behind locked pages
1071 * that we'll then need to deal with elsewhere.
1073 * Return non-zero if delayed release, or we experienced an error
1074 * such that the caller should requeue + retry later.
1076 * called with i_ceph_lock, then drops it.
1077 * caller should hold snap_rwsem (read), s_mutex.
1079 static int __send_cap(struct ceph_mds_client *mdsc, struct ceph_cap *cap,
1080 int op, int used, int want, int retain, int flushing,
1081 unsigned *pflush_tid)
1082 __releases(cap->ci->i_ceph_lock)
1084 struct ceph_inode_info *ci = cap->ci;
1085 struct inode *inode = &ci->vfs_inode;
1086 u64 cap_id = cap->cap_id;
1087 int held, revoking, dropping, keep;
1088 u64 seq, issue_seq, mseq, time_warp_seq, follows;
1090 struct timespec mtime, atime;
1095 struct ceph_mds_session *session;
1096 u64 xattr_version = 0;
1097 struct ceph_buffer *xattr_blob = NULL;
1103 held = cap->issued | cap->implemented;
1104 revoking = cap->implemented & ~cap->issued;
1105 retain &= ~revoking;
1106 dropping = cap->issued & ~retain;
1108 dout("__send_cap %p cap %p session %p %s -> %s (revoking %s)\n",
1109 inode, cap, cap->session,
1110 ceph_cap_string(held), ceph_cap_string(held & retain),
1111 ceph_cap_string(revoking));
1112 BUG_ON((retain & CEPH_CAP_PIN) == 0);
1114 session = cap->session;
1116 /* don't release wanted unless we've waited a bit. */
1117 if ((ci->i_ceph_flags & CEPH_I_NODELAY) == 0 &&
1118 time_before(jiffies, ci->i_hold_caps_min)) {
1119 dout(" delaying issued %s -> %s, wanted %s -> %s on send\n",
1120 ceph_cap_string(cap->issued),
1121 ceph_cap_string(cap->issued & retain),
1122 ceph_cap_string(cap->mds_wanted),
1123 ceph_cap_string(want));
1124 want |= cap->mds_wanted;
1125 retain |= cap->issued;
1128 ci->i_ceph_flags &= ~(CEPH_I_NODELAY | CEPH_I_FLUSH);
1130 cap->issued &= retain; /* drop bits we don't want */
1131 if (cap->implemented & ~cap->issued) {
1133 * Wake up any waiters on wanted -> needed transition.
1134 * This is due to the weird transition from buffered
1135 * to sync IO... we need to flush dirty pages _before_
1136 * allowing sync writes to avoid reordering.
1140 cap->implemented &= cap->issued | used;
1141 cap->mds_wanted = want;
1145 * assign a tid for flush operations so we can avoid
1146 * flush1 -> dirty1 -> flush2 -> flushack1 -> mark
1147 * clean type races. track latest tid for every bit
1148 * so we can handle flush AxFw, flush Fw, and have the
1149 * first ack clean Ax.
1151 flush_tid = ++ci->i_cap_flush_last_tid;
1153 *pflush_tid = flush_tid;
1154 dout(" cap_flush_tid %d\n", (int)flush_tid);
1155 for (i = 0; i < CEPH_CAP_BITS; i++)
1156 if (flushing & (1 << i))
1157 ci->i_cap_flush_tid[i] = flush_tid;
1159 follows = ci->i_head_snapc->seq;
1164 keep = cap->implemented;
1166 issue_seq = cap->issue_seq;
1168 size = inode->i_size;
1169 ci->i_reported_size = size;
1170 max_size = ci->i_wanted_max_size;
1171 ci->i_requested_max_size = max_size;
1172 mtime = inode->i_mtime;
1173 atime = inode->i_atime;
1174 time_warp_seq = ci->i_time_warp_seq;
1177 mode = inode->i_mode;
1179 if (flushing & CEPH_CAP_XATTR_EXCL) {
1180 __ceph_build_xattrs_blob(ci);
1181 xattr_blob = ci->i_xattrs.blob;
1182 xattr_version = ci->i_xattrs.version;
1185 spin_unlock(&ci->i_ceph_lock);
1187 ret = send_cap_msg(session, ceph_vino(inode).ino, cap_id,
1188 op, keep, want, flushing, seq, flush_tid, issue_seq, mseq,
1189 size, max_size, &mtime, &atime, time_warp_seq,
1190 uid, gid, mode, xattr_version, xattr_blob,
1193 dout("error sending cap msg, must requeue %p\n", inode);
1198 wake_up_all(&ci->i_cap_wq);
1204 * When a snapshot is taken, clients accumulate dirty metadata on
1205 * inodes with capabilities in ceph_cap_snaps to describe the file
1206 * state at the time the snapshot was taken. This must be flushed
1207 * asynchronously back to the MDS once sync writes complete and dirty
1208 * data is written out.
1210 * Unless @again is true, skip cap_snaps that were already sent to
1211 * the MDS (i.e., during this session).
1213 * Called under i_ceph_lock. Takes s_mutex as needed.
1215 void __ceph_flush_snaps(struct ceph_inode_info *ci,
1216 struct ceph_mds_session **psession,
1218 __releases(ci->i_ceph_lock)
1219 __acquires(ci->i_ceph_lock)
1221 struct inode *inode = &ci->vfs_inode;
1223 struct ceph_cap_snap *capsnap;
1225 struct ceph_mds_client *mdsc = ceph_inode_to_client(inode)->mdsc;
1226 struct ceph_mds_session *session = NULL; /* if session != NULL, we hold
1228 u64 next_follows = 0; /* keep track of how far we've gotten through the
1229 i_cap_snaps list, and skip these entries next time
1230 around to avoid an infinite loop */
1233 session = *psession;
1235 dout("__flush_snaps %p\n", inode);
1237 list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) {
1238 /* avoid an infiniute loop after retry */
1239 if (capsnap->follows < next_follows)
1242 * we need to wait for sync writes to complete and for dirty
1243 * pages to be written out.
1245 if (capsnap->dirty_pages || capsnap->writing)
1249 * if cap writeback already occurred, we should have dropped
1250 * the capsnap in ceph_put_wrbuffer_cap_refs.
1252 BUG_ON(capsnap->dirty == 0);
1254 /* pick mds, take s_mutex */
1255 if (ci->i_auth_cap == NULL) {
1256 dout("no auth cap (migrating?), doing nothing\n");
1260 /* only flush each capsnap once */
1261 if (!again && !list_empty(&capsnap->flushing_item)) {
1262 dout("already flushed %p, skipping\n", capsnap);
1266 mds = ci->i_auth_cap->session->s_mds;
1267 mseq = ci->i_auth_cap->mseq;
1269 if (session && session->s_mds != mds) {
1270 dout("oops, wrong session %p mutex\n", session);
1271 mutex_unlock(&session->s_mutex);
1272 ceph_put_mds_session(session);
1276 spin_unlock(&ci->i_ceph_lock);
1277 mutex_lock(&mdsc->mutex);
1278 session = __ceph_lookup_mds_session(mdsc, mds);
1279 mutex_unlock(&mdsc->mutex);
1281 dout("inverting session/ino locks on %p\n",
1283 mutex_lock(&session->s_mutex);
1286 * if session == NULL, we raced against a cap
1287 * deletion or migration. retry, and we'll
1288 * get a better @mds value next time.
1290 spin_lock(&ci->i_ceph_lock);
1294 capsnap->flush_tid = ++ci->i_cap_flush_last_tid;
1295 atomic_inc(&capsnap->nref);
1296 if (!list_empty(&capsnap->flushing_item))
1297 list_del_init(&capsnap->flushing_item);
1298 list_add_tail(&capsnap->flushing_item,
1299 &session->s_cap_snaps_flushing);
1300 spin_unlock(&ci->i_ceph_lock);
1302 dout("flush_snaps %p cap_snap %p follows %lld tid %llu\n",
1303 inode, capsnap, capsnap->follows, capsnap->flush_tid);
1304 send_cap_msg(session, ceph_vino(inode).ino, 0,
1305 CEPH_CAP_OP_FLUSHSNAP, capsnap->issued, 0,
1306 capsnap->dirty, 0, capsnap->flush_tid, 0, mseq,
1308 &capsnap->mtime, &capsnap->atime,
1309 capsnap->time_warp_seq,
1310 capsnap->uid, capsnap->gid, capsnap->mode,
1311 capsnap->xattr_version, capsnap->xattr_blob,
1314 next_follows = capsnap->follows + 1;
1315 ceph_put_cap_snap(capsnap);
1317 spin_lock(&ci->i_ceph_lock);
1321 /* we flushed them all; remove this inode from the queue */
1322 spin_lock(&mdsc->snap_flush_lock);
1323 list_del_init(&ci->i_snap_flush_item);
1324 spin_unlock(&mdsc->snap_flush_lock);
1328 *psession = session;
1330 mutex_unlock(&session->s_mutex);
1331 ceph_put_mds_session(session);
1335 static void ceph_flush_snaps(struct ceph_inode_info *ci)
1337 spin_lock(&ci->i_ceph_lock);
1338 __ceph_flush_snaps(ci, NULL, 0);
1339 spin_unlock(&ci->i_ceph_lock);
1343 * Mark caps dirty. If inode is newly dirty, return the dirty flags.
1344 * Caller is then responsible for calling __mark_inode_dirty with the
1345 * returned flags value.
1347 int __ceph_mark_dirty_caps(struct ceph_inode_info *ci, int mask)
1349 struct ceph_mds_client *mdsc =
1350 ceph_sb_to_client(ci->vfs_inode.i_sb)->mdsc;
1351 struct inode *inode = &ci->vfs_inode;
1352 int was = ci->i_dirty_caps;
1355 dout("__mark_dirty_caps %p %s dirty %s -> %s\n", &ci->vfs_inode,
1356 ceph_cap_string(mask), ceph_cap_string(was),
1357 ceph_cap_string(was | mask));
1358 ci->i_dirty_caps |= mask;
1360 if (!ci->i_head_snapc)
1361 ci->i_head_snapc = ceph_get_snap_context(
1362 ci->i_snap_realm->cached_context);
1363 dout(" inode %p now dirty snapc %p auth cap %p\n",
1364 &ci->vfs_inode, ci->i_head_snapc, ci->i_auth_cap);
1365 BUG_ON(!list_empty(&ci->i_dirty_item));
1366 spin_lock(&mdsc->cap_dirty_lock);
1368 list_add(&ci->i_dirty_item, &mdsc->cap_dirty);
1370 list_add(&ci->i_dirty_item,
1371 &mdsc->cap_dirty_migrating);
1372 spin_unlock(&mdsc->cap_dirty_lock);
1373 if (ci->i_flushing_caps == 0) {
1375 dirty |= I_DIRTY_SYNC;
1378 BUG_ON(list_empty(&ci->i_dirty_item));
1379 if (((was | ci->i_flushing_caps) & CEPH_CAP_FILE_BUFFER) &&
1380 (mask & CEPH_CAP_FILE_BUFFER))
1381 dirty |= I_DIRTY_DATASYNC;
1382 __cap_delay_requeue(mdsc, ci);
1387 * Add dirty inode to the flushing list. Assigned a seq number so we
1388 * can wait for caps to flush without starving.
1390 * Called under i_ceph_lock.
1392 static int __mark_caps_flushing(struct inode *inode,
1393 struct ceph_mds_session *session)
1395 struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
1396 struct ceph_inode_info *ci = ceph_inode(inode);
1399 BUG_ON(ci->i_dirty_caps == 0);
1400 BUG_ON(list_empty(&ci->i_dirty_item));
1402 flushing = ci->i_dirty_caps;
1403 dout("__mark_caps_flushing flushing %s, flushing_caps %s -> %s\n",
1404 ceph_cap_string(flushing),
1405 ceph_cap_string(ci->i_flushing_caps),
1406 ceph_cap_string(ci->i_flushing_caps | flushing));
1407 ci->i_flushing_caps |= flushing;
1408 ci->i_dirty_caps = 0;
1409 dout(" inode %p now !dirty\n", inode);
1411 spin_lock(&mdsc->cap_dirty_lock);
1412 list_del_init(&ci->i_dirty_item);
1414 ci->i_cap_flush_seq = ++mdsc->cap_flush_seq;
1415 if (list_empty(&ci->i_flushing_item)) {
1416 list_add_tail(&ci->i_flushing_item, &session->s_cap_flushing);
1417 mdsc->num_cap_flushing++;
1418 dout(" inode %p now flushing seq %lld\n", inode,
1419 ci->i_cap_flush_seq);
1421 list_move_tail(&ci->i_flushing_item, &session->s_cap_flushing);
1422 dout(" inode %p now flushing (more) seq %lld\n", inode,
1423 ci->i_cap_flush_seq);
1425 spin_unlock(&mdsc->cap_dirty_lock);
1431 * try to invalidate mapping pages without blocking.
1433 static int try_nonblocking_invalidate(struct inode *inode)
1435 struct ceph_inode_info *ci = ceph_inode(inode);
1436 u32 invalidating_gen = ci->i_rdcache_gen;
1438 spin_unlock(&ci->i_ceph_lock);
1439 invalidate_mapping_pages(&inode->i_data, 0, -1);
1440 spin_lock(&ci->i_ceph_lock);
1442 if (inode->i_data.nrpages == 0 &&
1443 invalidating_gen == ci->i_rdcache_gen) {
1445 dout("try_nonblocking_invalidate %p success\n", inode);
1446 /* save any racing async invalidate some trouble */
1447 ci->i_rdcache_revoking = ci->i_rdcache_gen - 1;
1450 dout("try_nonblocking_invalidate %p failed\n", inode);
1455 * Swiss army knife function to examine currently used and wanted
1456 * versus held caps. Release, flush, ack revoked caps to mds as
1459 * CHECK_CAPS_NODELAY - caller is delayed work and we should not delay
1460 * cap release further.
1461 * CHECK_CAPS_AUTHONLY - we should only check the auth cap
1462 * CHECK_CAPS_FLUSH - we should flush any dirty caps immediately, without
1465 void ceph_check_caps(struct ceph_inode_info *ci, int flags,
1466 struct ceph_mds_session *session)
1468 struct ceph_fs_client *fsc = ceph_inode_to_client(&ci->vfs_inode);
1469 struct ceph_mds_client *mdsc = fsc->mdsc;
1470 struct inode *inode = &ci->vfs_inode;
1471 struct ceph_cap *cap;
1472 int file_wanted, used, cap_used;
1473 int took_snap_rwsem = 0; /* true if mdsc->snap_rwsem held */
1474 int issued, implemented, want, retain, revoking, flushing = 0;
1475 int mds = -1; /* keep track of how far we've gone through i_caps list
1476 to avoid an infinite loop on retry */
1478 int tried_invalidate = 0;
1479 int delayed = 0, sent = 0, force_requeue = 0, num;
1480 int queue_invalidate = 0;
1481 int is_delayed = flags & CHECK_CAPS_NODELAY;
1483 /* if we are unmounting, flush any unused caps immediately. */
1487 spin_lock(&ci->i_ceph_lock);
1489 if (ci->i_ceph_flags & CEPH_I_FLUSH)
1490 flags |= CHECK_CAPS_FLUSH;
1492 /* flush snaps first time around only */
1493 if (!list_empty(&ci->i_cap_snaps))
1494 __ceph_flush_snaps(ci, &session, 0);
1497 spin_lock(&ci->i_ceph_lock);
1499 file_wanted = __ceph_caps_file_wanted(ci);
1500 used = __ceph_caps_used(ci);
1501 want = file_wanted | used;
1502 issued = __ceph_caps_issued(ci, &implemented);
1503 revoking = implemented & ~issued;
1505 retain = want | CEPH_CAP_PIN;
1506 if (!mdsc->stopping && inode->i_nlink > 0) {
1508 retain |= CEPH_CAP_ANY; /* be greedy */
1510 retain |= CEPH_CAP_ANY_SHARED;
1512 * keep RD only if we didn't have the file open RW,
1513 * because then the mds would revoke it anyway to
1514 * journal max_size=0.
1516 if (ci->i_max_size == 0)
1517 retain |= CEPH_CAP_ANY_RD;
1521 dout("check_caps %p file_want %s used %s dirty %s flushing %s"
1522 " issued %s revoking %s retain %s %s%s%s\n", inode,
1523 ceph_cap_string(file_wanted),
1524 ceph_cap_string(used), ceph_cap_string(ci->i_dirty_caps),
1525 ceph_cap_string(ci->i_flushing_caps),
1526 ceph_cap_string(issued), ceph_cap_string(revoking),
1527 ceph_cap_string(retain),
1528 (flags & CHECK_CAPS_AUTHONLY) ? " AUTHONLY" : "",
1529 (flags & CHECK_CAPS_NODELAY) ? " NODELAY" : "",
1530 (flags & CHECK_CAPS_FLUSH) ? " FLUSH" : "");
1533 * If we no longer need to hold onto old our caps, and we may
1534 * have cached pages, but don't want them, then try to invalidate.
1535 * If we fail, it's because pages are locked.... try again later.
1537 if ((!is_delayed || mdsc->stopping) &&
1538 ci->i_wrbuffer_ref == 0 && /* no dirty pages... */
1539 inode->i_data.nrpages && /* have cached pages */
1540 (file_wanted == 0 || /* no open files */
1541 (revoking & (CEPH_CAP_FILE_CACHE|
1542 CEPH_CAP_FILE_LAZYIO))) && /* or revoking cache */
1543 !tried_invalidate) {
1544 dout("check_caps trying to invalidate on %p\n", inode);
1545 if (try_nonblocking_invalidate(inode) < 0) {
1546 if (revoking & (CEPH_CAP_FILE_CACHE|
1547 CEPH_CAP_FILE_LAZYIO)) {
1548 dout("check_caps queuing invalidate\n");
1549 queue_invalidate = 1;
1550 ci->i_rdcache_revoking = ci->i_rdcache_gen;
1552 dout("check_caps failed to invalidate pages\n");
1553 /* we failed to invalidate pages. check these
1554 caps again later. */
1556 __cap_set_timeouts(mdsc, ci);
1559 tried_invalidate = 1;
1564 for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
1565 cap = rb_entry(p, struct ceph_cap, ci_node);
1568 /* avoid looping forever */
1569 if (mds >= cap->mds ||
1570 ((flags & CHECK_CAPS_AUTHONLY) && cap != ci->i_auth_cap))
1573 /* NOTE: no side-effects allowed, until we take s_mutex */
1576 if (ci->i_auth_cap && cap != ci->i_auth_cap)
1577 cap_used &= ~ci->i_auth_cap->issued;
1579 revoking = cap->implemented & ~cap->issued;
1580 dout(" mds%d cap %p used %s issued %s implemented %s revoking %s\n",
1581 cap->mds, cap, ceph_cap_string(cap->issued),
1582 ceph_cap_string(cap_used),
1583 ceph_cap_string(cap->implemented),
1584 ceph_cap_string(revoking));
1586 if (cap == ci->i_auth_cap &&
1587 (cap->issued & CEPH_CAP_FILE_WR)) {
1588 /* request larger max_size from MDS? */
1589 if (ci->i_wanted_max_size > ci->i_max_size &&
1590 ci->i_wanted_max_size > ci->i_requested_max_size) {
1591 dout("requesting new max_size\n");
1595 /* approaching file_max? */
1596 if ((inode->i_size << 1) >= ci->i_max_size &&
1597 (ci->i_reported_size << 1) < ci->i_max_size) {
1598 dout("i_size approaching max_size\n");
1602 /* flush anything dirty? */
1603 if (cap == ci->i_auth_cap && (flags & CHECK_CAPS_FLUSH) &&
1605 dout("flushing dirty caps\n");
1609 /* completed revocation? going down and there are no caps? */
1610 if (revoking && (revoking & cap_used) == 0) {
1611 dout("completed revocation of %s\n",
1612 ceph_cap_string(cap->implemented & ~cap->issued));
1616 /* want more caps from mds? */
1617 if (want & ~(cap->mds_wanted | cap->issued))
1620 /* things we might delay */
1621 if ((cap->issued & ~retain) == 0 &&
1622 cap->mds_wanted == want)
1623 continue; /* nope, all good */
1629 if ((ci->i_ceph_flags & CEPH_I_NODELAY) == 0 &&
1630 time_before(jiffies, ci->i_hold_caps_max)) {
1631 dout(" delaying issued %s -> %s, wanted %s -> %s\n",
1632 ceph_cap_string(cap->issued),
1633 ceph_cap_string(cap->issued & retain),
1634 ceph_cap_string(cap->mds_wanted),
1635 ceph_cap_string(want));
1641 if (ci->i_ceph_flags & CEPH_I_NOFLUSH) {
1642 dout(" skipping %p I_NOFLUSH set\n", inode);
1646 if (session && session != cap->session) {
1647 dout("oops, wrong session %p mutex\n", session);
1648 mutex_unlock(&session->s_mutex);
1652 session = cap->session;
1653 if (mutex_trylock(&session->s_mutex) == 0) {
1654 dout("inverting session/ino locks on %p\n",
1656 spin_unlock(&ci->i_ceph_lock);
1657 if (took_snap_rwsem) {
1658 up_read(&mdsc->snap_rwsem);
1659 took_snap_rwsem = 0;
1661 mutex_lock(&session->s_mutex);
1665 /* take snap_rwsem after session mutex */
1666 if (!took_snap_rwsem) {
1667 if (down_read_trylock(&mdsc->snap_rwsem) == 0) {
1668 dout("inverting snap/in locks on %p\n",
1670 spin_unlock(&ci->i_ceph_lock);
1671 down_read(&mdsc->snap_rwsem);
1672 took_snap_rwsem = 1;
1675 took_snap_rwsem = 1;
1678 if (cap == ci->i_auth_cap && ci->i_dirty_caps)
1679 flushing = __mark_caps_flushing(inode, session);
1683 mds = cap->mds; /* remember mds, so we don't repeat */
1686 /* __send_cap drops i_ceph_lock */
1687 delayed += __send_cap(mdsc, cap, CEPH_CAP_OP_UPDATE, cap_used,
1688 want, retain, flushing, NULL);
1689 goto retry; /* retake i_ceph_lock and restart our cap scan. */
1693 * Reschedule delayed caps release if we delayed anything,
1696 if (delayed && is_delayed)
1697 force_requeue = 1; /* __send_cap delayed release; requeue */
1698 if (!delayed && !is_delayed)
1699 __cap_delay_cancel(mdsc, ci);
1700 else if (!is_delayed || force_requeue)
1701 __cap_delay_requeue(mdsc, ci);
1703 spin_unlock(&ci->i_ceph_lock);
1705 if (queue_invalidate)
1706 ceph_queue_invalidate(inode);
1709 mutex_unlock(&session->s_mutex);
1710 if (took_snap_rwsem)
1711 up_read(&mdsc->snap_rwsem);
1715 * Try to flush dirty caps back to the auth mds.
1717 static int try_flush_caps(struct inode *inode, struct ceph_mds_session *session,
1718 unsigned *flush_tid)
1720 struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
1721 struct ceph_inode_info *ci = ceph_inode(inode);
1722 int unlock_session = session ? 0 : 1;
1726 spin_lock(&ci->i_ceph_lock);
1727 if (ci->i_ceph_flags & CEPH_I_NOFLUSH) {
1728 dout("try_flush_caps skipping %p I_NOFLUSH set\n", inode);
1731 if (ci->i_dirty_caps && ci->i_auth_cap) {
1732 struct ceph_cap *cap = ci->i_auth_cap;
1733 int used = __ceph_caps_used(ci);
1734 int want = __ceph_caps_wanted(ci);
1738 spin_unlock(&ci->i_ceph_lock);
1739 session = cap->session;
1740 mutex_lock(&session->s_mutex);
1743 BUG_ON(session != cap->session);
1744 if (cap->session->s_state < CEPH_MDS_SESSION_OPEN)
1747 flushing = __mark_caps_flushing(inode, session);
1749 /* __send_cap drops i_ceph_lock */
1750 delayed = __send_cap(mdsc, cap, CEPH_CAP_OP_FLUSH, used, want,
1751 cap->issued | cap->implemented, flushing,
1756 spin_lock(&ci->i_ceph_lock);
1757 __cap_delay_requeue(mdsc, ci);
1760 spin_unlock(&ci->i_ceph_lock);
1762 if (session && unlock_session)
1763 mutex_unlock(&session->s_mutex);
1768 * Return true if we've flushed caps through the given flush_tid.
1770 static int caps_are_flushed(struct inode *inode, unsigned tid)
1772 struct ceph_inode_info *ci = ceph_inode(inode);
1775 spin_lock(&ci->i_ceph_lock);
1776 for (i = 0; i < CEPH_CAP_BITS; i++)
1777 if ((ci->i_flushing_caps & (1 << i)) &&
1778 ci->i_cap_flush_tid[i] <= tid) {
1779 /* still flushing this bit */
1783 spin_unlock(&ci->i_ceph_lock);
1788 * Wait on any unsafe replies for the given inode. First wait on the
1789 * newest request, and make that the upper bound. Then, if there are
1790 * more requests, keep waiting on the oldest as long as it is still older
1791 * than the original request.
1793 static void sync_write_wait(struct inode *inode)
1795 struct ceph_inode_info *ci = ceph_inode(inode);
1796 struct list_head *head = &ci->i_unsafe_writes;
1797 struct ceph_osd_request *req;
1800 spin_lock(&ci->i_unsafe_lock);
1801 if (list_empty(head))
1804 /* set upper bound as _last_ entry in chain */
1805 req = list_entry(head->prev, struct ceph_osd_request,
1807 last_tid = req->r_tid;
1810 ceph_osdc_get_request(req);
1811 spin_unlock(&ci->i_unsafe_lock);
1812 dout("sync_write_wait on tid %llu (until %llu)\n",
1813 req->r_tid, last_tid);
1814 wait_for_completion(&req->r_safe_completion);
1815 spin_lock(&ci->i_unsafe_lock);
1816 ceph_osdc_put_request(req);
1819 * from here on look at first entry in chain, since we
1820 * only want to wait for anything older than last_tid
1822 if (list_empty(head))
1824 req = list_entry(head->next, struct ceph_osd_request,
1826 } while (req->r_tid < last_tid);
1828 spin_unlock(&ci->i_unsafe_lock);
1831 int ceph_fsync(struct file *file, loff_t start, loff_t end, int datasync)
1833 struct inode *inode = file->f_mapping->host;
1834 struct ceph_inode_info *ci = ceph_inode(inode);
1839 dout("fsync %p%s\n", inode, datasync ? " datasync" : "");
1840 sync_write_wait(inode);
1842 ret = filemap_write_and_wait_range(inode->i_mapping, start, end);
1845 mutex_lock(&inode->i_mutex);
1847 dirty = try_flush_caps(inode, NULL, &flush_tid);
1848 dout("fsync dirty caps are %s\n", ceph_cap_string(dirty));
1851 * only wait on non-file metadata writeback (the mds
1852 * can recover size and mtime, so we don't need to
1855 if (!datasync && (dirty & ~CEPH_CAP_ANY_FILE_WR)) {
1856 dout("fsync waiting for flush_tid %u\n", flush_tid);
1857 ret = wait_event_interruptible(ci->i_cap_wq,
1858 caps_are_flushed(inode, flush_tid));
1861 dout("fsync %p%s done\n", inode, datasync ? " datasync" : "");
1862 mutex_unlock(&inode->i_mutex);
1867 * Flush any dirty caps back to the mds. If we aren't asked to wait,
1868 * queue inode for flush but don't do so immediately, because we can
1869 * get by with fewer MDS messages if we wait for data writeback to
1872 int ceph_write_inode(struct inode *inode, struct writeback_control *wbc)
1874 struct ceph_inode_info *ci = ceph_inode(inode);
1878 int wait = wbc->sync_mode == WB_SYNC_ALL;
1880 dout("write_inode %p wait=%d\n", inode, wait);
1882 dirty = try_flush_caps(inode, NULL, &flush_tid);
1884 err = wait_event_interruptible(ci->i_cap_wq,
1885 caps_are_flushed(inode, flush_tid));
1887 struct ceph_mds_client *mdsc =
1888 ceph_sb_to_client(inode->i_sb)->mdsc;
1890 spin_lock(&ci->i_ceph_lock);
1891 if (__ceph_caps_dirty(ci))
1892 __cap_delay_requeue_front(mdsc, ci);
1893 spin_unlock(&ci->i_ceph_lock);
1899 * After a recovering MDS goes active, we need to resend any caps
1902 * Caller holds session->s_mutex.
1904 static void kick_flushing_capsnaps(struct ceph_mds_client *mdsc,
1905 struct ceph_mds_session *session)
1907 struct ceph_cap_snap *capsnap;
1909 dout("kick_flushing_capsnaps mds%d\n", session->s_mds);
1910 list_for_each_entry(capsnap, &session->s_cap_snaps_flushing,
1912 struct ceph_inode_info *ci = capsnap->ci;
1913 struct inode *inode = &ci->vfs_inode;
1914 struct ceph_cap *cap;
1916 spin_lock(&ci->i_ceph_lock);
1917 cap = ci->i_auth_cap;
1918 if (cap && cap->session == session) {
1919 dout("kick_flushing_caps %p cap %p capsnap %p\n", inode,
1921 __ceph_flush_snaps(ci, &session, 1);
1923 pr_err("%p auth cap %p not mds%d ???\n", inode,
1924 cap, session->s_mds);
1926 spin_unlock(&ci->i_ceph_lock);
1930 void ceph_kick_flushing_caps(struct ceph_mds_client *mdsc,
1931 struct ceph_mds_session *session)
1933 struct ceph_inode_info *ci;
1935 kick_flushing_capsnaps(mdsc, session);
1937 dout("kick_flushing_caps mds%d\n", session->s_mds);
1938 list_for_each_entry(ci, &session->s_cap_flushing, i_flushing_item) {
1939 struct inode *inode = &ci->vfs_inode;
1940 struct ceph_cap *cap;
1943 spin_lock(&ci->i_ceph_lock);
1944 cap = ci->i_auth_cap;
1945 if (cap && cap->session == session) {
1946 dout("kick_flushing_caps %p cap %p %s\n", inode,
1947 cap, ceph_cap_string(ci->i_flushing_caps));
1948 delayed = __send_cap(mdsc, cap, CEPH_CAP_OP_FLUSH,
1949 __ceph_caps_used(ci),
1950 __ceph_caps_wanted(ci),
1951 cap->issued | cap->implemented,
1952 ci->i_flushing_caps, NULL);
1954 spin_lock(&ci->i_ceph_lock);
1955 __cap_delay_requeue(mdsc, ci);
1956 spin_unlock(&ci->i_ceph_lock);
1959 pr_err("%p auth cap %p not mds%d ???\n", inode,
1960 cap, session->s_mds);
1961 spin_unlock(&ci->i_ceph_lock);
1966 static void kick_flushing_inode_caps(struct ceph_mds_client *mdsc,
1967 struct ceph_mds_session *session,
1968 struct inode *inode)
1970 struct ceph_inode_info *ci = ceph_inode(inode);
1971 struct ceph_cap *cap;
1974 spin_lock(&ci->i_ceph_lock);
1975 cap = ci->i_auth_cap;
1976 dout("kick_flushing_inode_caps %p flushing %s flush_seq %lld\n", inode,
1977 ceph_cap_string(ci->i_flushing_caps), ci->i_cap_flush_seq);
1979 __ceph_flush_snaps(ci, &session, 1);
1981 if (ci->i_flushing_caps) {
1982 spin_lock(&mdsc->cap_dirty_lock);
1983 list_move_tail(&ci->i_flushing_item,
1984 &cap->session->s_cap_flushing);
1985 spin_unlock(&mdsc->cap_dirty_lock);
1987 delayed = __send_cap(mdsc, cap, CEPH_CAP_OP_FLUSH,
1988 __ceph_caps_used(ci),
1989 __ceph_caps_wanted(ci),
1990 cap->issued | cap->implemented,
1991 ci->i_flushing_caps, NULL);
1993 spin_lock(&ci->i_ceph_lock);
1994 __cap_delay_requeue(mdsc, ci);
1995 spin_unlock(&ci->i_ceph_lock);
1998 spin_unlock(&ci->i_ceph_lock);
2004 * Take references to capabilities we hold, so that we don't release
2005 * them to the MDS prematurely.
2007 * Protected by i_ceph_lock.
2009 static void __take_cap_refs(struct ceph_inode_info *ci, int got)
2011 if (got & CEPH_CAP_PIN)
2013 if (got & CEPH_CAP_FILE_RD)
2015 if (got & CEPH_CAP_FILE_CACHE)
2016 ci->i_rdcache_ref++;
2017 if (got & CEPH_CAP_FILE_WR)
2019 if (got & CEPH_CAP_FILE_BUFFER) {
2020 if (ci->i_wb_ref == 0)
2021 ihold(&ci->vfs_inode);
2023 dout("__take_cap_refs %p wb %d -> %d (?)\n",
2024 &ci->vfs_inode, ci->i_wb_ref-1, ci->i_wb_ref);
2029 * Try to grab cap references. Specify those refs we @want, and the
2030 * minimal set we @need. Also include the larger offset we are writing
2031 * to (when applicable), and check against max_size here as well.
2032 * Note that caller is responsible for ensuring max_size increases are
2033 * requested from the MDS.
2035 static int try_get_cap_refs(struct ceph_inode_info *ci, int need, int want,
2036 int *got, loff_t endoff, int *check_max, int *err)
2038 struct inode *inode = &ci->vfs_inode;
2040 int have, implemented;
2043 dout("get_cap_refs %p need %s want %s\n", inode,
2044 ceph_cap_string(need), ceph_cap_string(want));
2045 spin_lock(&ci->i_ceph_lock);
2047 /* make sure file is actually open */
2048 file_wanted = __ceph_caps_file_wanted(ci);
2049 if ((file_wanted & need) == 0) {
2050 dout("try_get_cap_refs need %s file_wanted %s, EBADF\n",
2051 ceph_cap_string(need), ceph_cap_string(file_wanted));
2057 /* finish pending truncate */
2058 while (ci->i_truncate_pending) {
2059 spin_unlock(&ci->i_ceph_lock);
2060 if (!(need & CEPH_CAP_FILE_WR))
2061 mutex_lock(&inode->i_mutex);
2062 __ceph_do_pending_vmtruncate(inode);
2063 if (!(need & CEPH_CAP_FILE_WR))
2064 mutex_unlock(&inode->i_mutex);
2065 spin_lock(&ci->i_ceph_lock);
2068 if (need & CEPH_CAP_FILE_WR) {
2069 if (endoff >= 0 && endoff > (loff_t)ci->i_max_size) {
2070 dout("get_cap_refs %p endoff %llu > maxsize %llu\n",
2071 inode, endoff, ci->i_max_size);
2072 if (endoff > ci->i_wanted_max_size) {
2079 * If a sync write is in progress, we must wait, so that we
2080 * can get a final snapshot value for size+mtime.
2082 if (__ceph_have_pending_cap_snap(ci)) {
2083 dout("get_cap_refs %p cap_snap_pending\n", inode);
2087 have = __ceph_caps_issued(ci, &implemented);
2089 if ((have & need) == need) {
2091 * Look at (implemented & ~have & not) so that we keep waiting
2092 * on transition from wanted -> needed caps. This is needed
2093 * for WRBUFFER|WR -> WR to avoid a new WR sync write from
2094 * going before a prior buffered writeback happens.
2096 int not = want & ~(have & need);
2097 int revoking = implemented & ~have;
2098 dout("get_cap_refs %p have %s but not %s (revoking %s)\n",
2099 inode, ceph_cap_string(have), ceph_cap_string(not),
2100 ceph_cap_string(revoking));
2101 if ((revoking & not) == 0) {
2102 *got = need | (have & want);
2103 __take_cap_refs(ci, *got);
2107 dout("get_cap_refs %p have %s needed %s\n", inode,
2108 ceph_cap_string(have), ceph_cap_string(need));
2111 spin_unlock(&ci->i_ceph_lock);
2112 dout("get_cap_refs %p ret %d got %s\n", inode,
2113 ret, ceph_cap_string(*got));
2118 * Check the offset we are writing up to against our current
2119 * max_size. If necessary, tell the MDS we want to write to
2122 static void check_max_size(struct inode *inode, loff_t endoff)
2124 struct ceph_inode_info *ci = ceph_inode(inode);
2127 /* do we need to explicitly request a larger max_size? */
2128 spin_lock(&ci->i_ceph_lock);
2129 if ((endoff >= ci->i_max_size ||
2130 endoff > (inode->i_size << 1)) &&
2131 endoff > ci->i_wanted_max_size) {
2132 dout("write %p at large endoff %llu, req max_size\n",
2134 ci->i_wanted_max_size = endoff;
2137 spin_unlock(&ci->i_ceph_lock);
2139 ceph_check_caps(ci, CHECK_CAPS_AUTHONLY, NULL);
2143 * Wait for caps, and take cap references. If we can't get a WR cap
2144 * due to a small max_size, make sure we check_max_size (and possibly
2145 * ask the mds) so we don't get hung up indefinitely.
2147 int ceph_get_caps(struct ceph_inode_info *ci, int need, int want, int *got,
2150 int check_max, ret, err;
2154 check_max_size(&ci->vfs_inode, endoff);
2157 ret = wait_event_interruptible(ci->i_cap_wq,
2158 try_get_cap_refs(ci, need, want,
2169 * Take cap refs. Caller must already know we hold at least one ref
2170 * on the caps in question or we don't know this is safe.
2172 void ceph_get_cap_refs(struct ceph_inode_info *ci, int caps)
2174 spin_lock(&ci->i_ceph_lock);
2175 __take_cap_refs(ci, caps);
2176 spin_unlock(&ci->i_ceph_lock);
2182 * If we released the last ref on any given cap, call ceph_check_caps
2183 * to release (or schedule a release).
2185 * If we are releasing a WR cap (from a sync write), finalize any affected
2186 * cap_snap, and wake up any waiters.
2188 void ceph_put_cap_refs(struct ceph_inode_info *ci, int had)
2190 struct inode *inode = &ci->vfs_inode;
2191 int last = 0, put = 0, flushsnaps = 0, wake = 0;
2192 struct ceph_cap_snap *capsnap;
2194 spin_lock(&ci->i_ceph_lock);
2195 if (had & CEPH_CAP_PIN)
2197 if (had & CEPH_CAP_FILE_RD)
2198 if (--ci->i_rd_ref == 0)
2200 if (had & CEPH_CAP_FILE_CACHE)
2201 if (--ci->i_rdcache_ref == 0)
2203 if (had & CEPH_CAP_FILE_BUFFER) {
2204 if (--ci->i_wb_ref == 0) {
2208 dout("put_cap_refs %p wb %d -> %d (?)\n",
2209 inode, ci->i_wb_ref+1, ci->i_wb_ref);
2211 if (had & CEPH_CAP_FILE_WR)
2212 if (--ci->i_wr_ref == 0) {
2214 if (!list_empty(&ci->i_cap_snaps)) {
2215 capsnap = list_first_entry(&ci->i_cap_snaps,
2216 struct ceph_cap_snap,
2218 if (capsnap->writing) {
2219 capsnap->writing = 0;
2221 __ceph_finish_cap_snap(ci,
2227 spin_unlock(&ci->i_ceph_lock);
2229 dout("put_cap_refs %p had %s%s%s\n", inode, ceph_cap_string(had),
2230 last ? " last" : "", put ? " put" : "");
2232 if (last && !flushsnaps)
2233 ceph_check_caps(ci, 0, NULL);
2234 else if (flushsnaps)
2235 ceph_flush_snaps(ci);
2237 wake_up_all(&ci->i_cap_wq);
2243 * Release @nr WRBUFFER refs on dirty pages for the given @snapc snap
2244 * context. Adjust per-snap dirty page accounting as appropriate.
2245 * Once all dirty data for a cap_snap is flushed, flush snapped file
2246 * metadata back to the MDS. If we dropped the last ref, call
2249 void ceph_put_wrbuffer_cap_refs(struct ceph_inode_info *ci, int nr,
2250 struct ceph_snap_context *snapc)
2252 struct inode *inode = &ci->vfs_inode;
2254 int complete_capsnap = 0;
2255 int drop_capsnap = 0;
2257 struct ceph_cap_snap *capsnap = NULL;
2259 spin_lock(&ci->i_ceph_lock);
2260 ci->i_wrbuffer_ref -= nr;
2261 last = !ci->i_wrbuffer_ref;
2263 if (ci->i_head_snapc == snapc) {
2264 ci->i_wrbuffer_ref_head -= nr;
2265 if (ci->i_wrbuffer_ref_head == 0 &&
2266 ci->i_dirty_caps == 0 && ci->i_flushing_caps == 0) {
2267 BUG_ON(!ci->i_head_snapc);
2268 ceph_put_snap_context(ci->i_head_snapc);
2269 ci->i_head_snapc = NULL;
2271 dout("put_wrbuffer_cap_refs on %p head %d/%d -> %d/%d %s\n",
2273 ci->i_wrbuffer_ref+nr, ci->i_wrbuffer_ref_head+nr,
2274 ci->i_wrbuffer_ref, ci->i_wrbuffer_ref_head,
2275 last ? " LAST" : "");
2277 list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) {
2278 if (capsnap->context == snapc) {
2284 capsnap->dirty_pages -= nr;
2285 if (capsnap->dirty_pages == 0) {
2286 complete_capsnap = 1;
2287 if (capsnap->dirty == 0)
2288 /* cap writeback completed before we created
2289 * the cap_snap; no FLUSHSNAP is needed */
2292 dout("put_wrbuffer_cap_refs on %p cap_snap %p "
2293 " snap %lld %d/%d -> %d/%d %s%s%s\n",
2294 inode, capsnap, capsnap->context->seq,
2295 ci->i_wrbuffer_ref+nr, capsnap->dirty_pages + nr,
2296 ci->i_wrbuffer_ref, capsnap->dirty_pages,
2297 last ? " (wrbuffer last)" : "",
2298 complete_capsnap ? " (complete capsnap)" : "",
2299 drop_capsnap ? " (drop capsnap)" : "");
2301 ceph_put_snap_context(capsnap->context);
2302 list_del(&capsnap->ci_item);
2303 list_del(&capsnap->flushing_item);
2304 ceph_put_cap_snap(capsnap);
2308 spin_unlock(&ci->i_ceph_lock);
2311 ceph_check_caps(ci, CHECK_CAPS_AUTHONLY, NULL);
2313 } else if (complete_capsnap) {
2314 ceph_flush_snaps(ci);
2315 wake_up_all(&ci->i_cap_wq);
2322 * Handle a cap GRANT message from the MDS. (Note that a GRANT may
2323 * actually be a revocation if it specifies a smaller cap set.)
2325 * caller holds s_mutex and i_ceph_lock, we drop both.
2329 * 1 - check_caps on auth cap only (writeback)
2330 * 2 - check_caps (ack revoke)
2332 static void handle_cap_grant(struct inode *inode, struct ceph_mds_caps *grant,
2333 struct ceph_mds_session *session,
2334 struct ceph_cap *cap,
2335 struct ceph_buffer *xattr_buf)
2336 __releases(ci->i_ceph_lock)
2338 struct ceph_inode_info *ci = ceph_inode(inode);
2339 int mds = session->s_mds;
2340 int seq = le32_to_cpu(grant->seq);
2341 int newcaps = le32_to_cpu(grant->caps);
2342 int issued, implemented, used, wanted, dirty;
2343 u64 size = le64_to_cpu(grant->size);
2344 u64 max_size = le64_to_cpu(grant->max_size);
2345 struct timespec mtime, atime, ctime;
2349 int revoked_rdcache = 0;
2350 int queue_invalidate = 0;
2352 dout("handle_cap_grant inode %p cap %p mds%d seq %d %s\n",
2353 inode, cap, mds, seq, ceph_cap_string(newcaps));
2354 dout(" size %llu max_size %llu, i_size %llu\n", size, max_size,
2358 * If CACHE is being revoked, and we have no dirty buffers,
2359 * try to invalidate (once). (If there are dirty buffers, we
2360 * will invalidate _after_ writeback.)
2362 if (((cap->issued & ~newcaps) & CEPH_CAP_FILE_CACHE) &&
2363 (newcaps & CEPH_CAP_FILE_LAZYIO) == 0 &&
2364 !ci->i_wrbuffer_ref) {
2365 if (try_nonblocking_invalidate(inode) == 0) {
2366 revoked_rdcache = 1;
2368 /* there were locked pages.. invalidate later
2369 in a separate thread. */
2370 if (ci->i_rdcache_revoking != ci->i_rdcache_gen) {
2371 queue_invalidate = 1;
2372 ci->i_rdcache_revoking = ci->i_rdcache_gen;
2377 /* side effects now are allowed */
2379 issued = __ceph_caps_issued(ci, &implemented);
2380 issued |= implemented | __ceph_caps_dirty(ci);
2382 cap->cap_gen = session->s_cap_gen;
2384 __check_cap_issue(ci, cap, newcaps);
2386 if ((issued & CEPH_CAP_AUTH_EXCL) == 0) {
2387 inode->i_mode = le32_to_cpu(grant->mode);
2388 inode->i_uid = make_kuid(&init_user_ns, le32_to_cpu(grant->uid));
2389 inode->i_gid = make_kgid(&init_user_ns, le32_to_cpu(grant->gid));
2390 dout("%p mode 0%o uid.gid %d.%d\n", inode, inode->i_mode,
2391 from_kuid(&init_user_ns, inode->i_uid),
2392 from_kgid(&init_user_ns, inode->i_gid));
2395 if ((issued & CEPH_CAP_LINK_EXCL) == 0)
2396 set_nlink(inode, le32_to_cpu(grant->nlink));
2398 if ((issued & CEPH_CAP_XATTR_EXCL) == 0 && grant->xattr_len) {
2399 int len = le32_to_cpu(grant->xattr_len);
2400 u64 version = le64_to_cpu(grant->xattr_version);
2402 if (version > ci->i_xattrs.version) {
2403 dout(" got new xattrs v%llu on %p len %d\n",
2404 version, inode, len);
2405 if (ci->i_xattrs.blob)
2406 ceph_buffer_put(ci->i_xattrs.blob);
2407 ci->i_xattrs.blob = ceph_buffer_get(xattr_buf);
2408 ci->i_xattrs.version = version;
2412 /* size/ctime/mtime/atime? */
2413 ceph_fill_file_size(inode, issued,
2414 le32_to_cpu(grant->truncate_seq),
2415 le64_to_cpu(grant->truncate_size), size);
2416 ceph_decode_timespec(&mtime, &grant->mtime);
2417 ceph_decode_timespec(&atime, &grant->atime);
2418 ceph_decode_timespec(&ctime, &grant->ctime);
2419 ceph_fill_file_time(inode, issued,
2420 le32_to_cpu(grant->time_warp_seq), &ctime, &mtime,
2423 /* max size increase? */
2424 if (ci->i_auth_cap == cap && max_size != ci->i_max_size) {
2425 dout("max_size %lld -> %llu\n", ci->i_max_size, max_size);
2426 ci->i_max_size = max_size;
2427 if (max_size >= ci->i_wanted_max_size) {
2428 ci->i_wanted_max_size = 0; /* reset */
2429 ci->i_requested_max_size = 0;
2434 /* check cap bits */
2435 wanted = __ceph_caps_wanted(ci);
2436 used = __ceph_caps_used(ci);
2437 dirty = __ceph_caps_dirty(ci);
2438 dout(" my wanted = %s, used = %s, dirty %s\n",
2439 ceph_cap_string(wanted),
2440 ceph_cap_string(used),
2441 ceph_cap_string(dirty));
2442 if (wanted != le32_to_cpu(grant->wanted)) {
2443 dout("mds wanted %s -> %s\n",
2444 ceph_cap_string(le32_to_cpu(grant->wanted)),
2445 ceph_cap_string(wanted));
2446 /* imported cap may not have correct mds_wanted */
2447 if (le32_to_cpu(grant->op) == CEPH_CAP_OP_IMPORT)
2453 /* file layout may have changed */
2454 ci->i_layout = grant->layout;
2456 /* revocation, grant, or no-op? */
2457 if (cap->issued & ~newcaps) {
2458 int revoking = cap->issued & ~newcaps;
2460 dout("revocation: %s -> %s (revoking %s)\n",
2461 ceph_cap_string(cap->issued),
2462 ceph_cap_string(newcaps),
2463 ceph_cap_string(revoking));
2464 if (revoking & used & CEPH_CAP_FILE_BUFFER)
2465 writeback = 1; /* initiate writeback; will delay ack */
2466 else if (revoking == CEPH_CAP_FILE_CACHE &&
2467 (newcaps & CEPH_CAP_FILE_LAZYIO) == 0 &&
2469 ; /* do nothing yet, invalidation will be queued */
2470 else if (cap == ci->i_auth_cap)
2471 check_caps = 1; /* check auth cap only */
2473 check_caps = 2; /* check all caps */
2474 cap->issued = newcaps;
2475 cap->implemented |= newcaps;
2476 } else if (cap->issued == newcaps) {
2477 dout("caps unchanged: %s -> %s\n",
2478 ceph_cap_string(cap->issued), ceph_cap_string(newcaps));
2480 dout("grant: %s -> %s\n", ceph_cap_string(cap->issued),
2481 ceph_cap_string(newcaps));
2482 cap->issued = newcaps;
2483 cap->implemented |= newcaps; /* add bits only, to
2484 * avoid stepping on a
2485 * pending revocation */
2488 BUG_ON(cap->issued & ~cap->implemented);
2490 spin_unlock(&ci->i_ceph_lock);
2493 * queue inode for writeback: we can't actually call
2494 * filemap_write_and_wait, etc. from message handler
2497 ceph_queue_writeback(inode);
2498 if (queue_invalidate)
2499 ceph_queue_invalidate(inode);
2501 wake_up_all(&ci->i_cap_wq);
2503 if (check_caps == 1)
2504 ceph_check_caps(ci, CHECK_CAPS_NODELAY|CHECK_CAPS_AUTHONLY,
2506 else if (check_caps == 2)
2507 ceph_check_caps(ci, CHECK_CAPS_NODELAY, session);
2509 mutex_unlock(&session->s_mutex);
2513 * Handle FLUSH_ACK from MDS, indicating that metadata we sent to the
2514 * MDS has been safely committed.
2516 static void handle_cap_flush_ack(struct inode *inode, u64 flush_tid,
2517 struct ceph_mds_caps *m,
2518 struct ceph_mds_session *session,
2519 struct ceph_cap *cap)
2520 __releases(ci->i_ceph_lock)
2522 struct ceph_inode_info *ci = ceph_inode(inode);
2523 struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
2524 unsigned seq = le32_to_cpu(m->seq);
2525 int dirty = le32_to_cpu(m->dirty);
2530 for (i = 0; i < CEPH_CAP_BITS; i++)
2531 if ((dirty & (1 << i)) &&
2532 flush_tid == ci->i_cap_flush_tid[i])
2535 dout("handle_cap_flush_ack inode %p mds%d seq %d on %s cleaned %s,"
2536 " flushing %s -> %s\n",
2537 inode, session->s_mds, seq, ceph_cap_string(dirty),
2538 ceph_cap_string(cleaned), ceph_cap_string(ci->i_flushing_caps),
2539 ceph_cap_string(ci->i_flushing_caps & ~cleaned));
2541 if (ci->i_flushing_caps == (ci->i_flushing_caps & ~cleaned))
2544 ci->i_flushing_caps &= ~cleaned;
2546 spin_lock(&mdsc->cap_dirty_lock);
2547 if (ci->i_flushing_caps == 0) {
2548 list_del_init(&ci->i_flushing_item);
2549 if (!list_empty(&session->s_cap_flushing))
2550 dout(" mds%d still flushing cap on %p\n",
2552 &list_entry(session->s_cap_flushing.next,
2553 struct ceph_inode_info,
2554 i_flushing_item)->vfs_inode);
2555 mdsc->num_cap_flushing--;
2556 wake_up_all(&mdsc->cap_flushing_wq);
2557 dout(" inode %p now !flushing\n", inode);
2559 if (ci->i_dirty_caps == 0) {
2560 dout(" inode %p now clean\n", inode);
2561 BUG_ON(!list_empty(&ci->i_dirty_item));
2563 if (ci->i_wrbuffer_ref_head == 0) {
2564 BUG_ON(!ci->i_head_snapc);
2565 ceph_put_snap_context(ci->i_head_snapc);
2566 ci->i_head_snapc = NULL;
2569 BUG_ON(list_empty(&ci->i_dirty_item));
2572 spin_unlock(&mdsc->cap_dirty_lock);
2573 wake_up_all(&ci->i_cap_wq);
2576 spin_unlock(&ci->i_ceph_lock);
2582 * Handle FLUSHSNAP_ACK. MDS has flushed snap data to disk and we can
2583 * throw away our cap_snap.
2585 * Caller hold s_mutex.
2587 static void handle_cap_flushsnap_ack(struct inode *inode, u64 flush_tid,
2588 struct ceph_mds_caps *m,
2589 struct ceph_mds_session *session)
2591 struct ceph_inode_info *ci = ceph_inode(inode);
2592 u64 follows = le64_to_cpu(m->snap_follows);
2593 struct ceph_cap_snap *capsnap;
2596 dout("handle_cap_flushsnap_ack inode %p ci %p mds%d follows %lld\n",
2597 inode, ci, session->s_mds, follows);
2599 spin_lock(&ci->i_ceph_lock);
2600 list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) {
2601 if (capsnap->follows == follows) {
2602 if (capsnap->flush_tid != flush_tid) {
2603 dout(" cap_snap %p follows %lld tid %lld !="
2604 " %lld\n", capsnap, follows,
2605 flush_tid, capsnap->flush_tid);
2608 WARN_ON(capsnap->dirty_pages || capsnap->writing);
2609 dout(" removing %p cap_snap %p follows %lld\n",
2610 inode, capsnap, follows);
2611 ceph_put_snap_context(capsnap->context);
2612 list_del(&capsnap->ci_item);
2613 list_del(&capsnap->flushing_item);
2614 ceph_put_cap_snap(capsnap);
2618 dout(" skipping cap_snap %p follows %lld\n",
2619 capsnap, capsnap->follows);
2622 spin_unlock(&ci->i_ceph_lock);
2628 * Handle TRUNC from MDS, indicating file truncation.
2630 * caller hold s_mutex.
2632 static void handle_cap_trunc(struct inode *inode,
2633 struct ceph_mds_caps *trunc,
2634 struct ceph_mds_session *session)
2635 __releases(ci->i_ceph_lock)
2637 struct ceph_inode_info *ci = ceph_inode(inode);
2638 int mds = session->s_mds;
2639 int seq = le32_to_cpu(trunc->seq);
2640 u32 truncate_seq = le32_to_cpu(trunc->truncate_seq);
2641 u64 truncate_size = le64_to_cpu(trunc->truncate_size);
2642 u64 size = le64_to_cpu(trunc->size);
2643 int implemented = 0;
2644 int dirty = __ceph_caps_dirty(ci);
2645 int issued = __ceph_caps_issued(ceph_inode(inode), &implemented);
2646 int queue_trunc = 0;
2648 issued |= implemented | dirty;
2650 dout("handle_cap_trunc inode %p mds%d seq %d to %lld seq %d\n",
2651 inode, mds, seq, truncate_size, truncate_seq);
2652 queue_trunc = ceph_fill_file_size(inode, issued,
2653 truncate_seq, truncate_size, size);
2654 spin_unlock(&ci->i_ceph_lock);
2657 ceph_queue_vmtruncate(inode);
2661 * Handle EXPORT from MDS. Cap is being migrated _from_ this mds to a
2662 * different one. If we are the most recent migration we've seen (as
2663 * indicated by mseq), make note of the migrating cap bits for the
2664 * duration (until we see the corresponding IMPORT).
2666 * caller holds s_mutex
2668 static void handle_cap_export(struct inode *inode, struct ceph_mds_caps *ex,
2669 struct ceph_mds_session *session,
2670 int *open_target_sessions)
2672 struct ceph_mds_client *mdsc = ceph_inode_to_client(inode)->mdsc;
2673 struct ceph_inode_info *ci = ceph_inode(inode);
2674 int mds = session->s_mds;
2675 unsigned mseq = le32_to_cpu(ex->migrate_seq);
2676 struct ceph_cap *cap = NULL, *t;
2680 dout("handle_cap_export inode %p ci %p mds%d mseq %d\n",
2681 inode, ci, mds, mseq);
2683 spin_lock(&ci->i_ceph_lock);
2685 /* make sure we haven't seen a higher mseq */
2686 for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
2687 t = rb_entry(p, struct ceph_cap, ci_node);
2688 if (ceph_seq_cmp(t->mseq, mseq) > 0) {
2689 dout(" higher mseq on cap from mds%d\n",
2693 if (t->session->s_mds == mds)
2700 ci->i_cap_exporting_mds = mds;
2701 ci->i_cap_exporting_mseq = mseq;
2702 ci->i_cap_exporting_issued = cap->issued;
2705 * make sure we have open sessions with all possible
2706 * export targets, so that we get the matching IMPORT
2708 *open_target_sessions = 1;
2711 * we can't flush dirty caps that we've seen the
2712 * EXPORT but no IMPORT for
2714 spin_lock(&mdsc->cap_dirty_lock);
2715 if (!list_empty(&ci->i_dirty_item)) {
2716 dout(" moving %p to cap_dirty_migrating\n",
2718 list_move(&ci->i_dirty_item,
2719 &mdsc->cap_dirty_migrating);
2721 spin_unlock(&mdsc->cap_dirty_lock);
2723 __ceph_remove_cap(cap);
2725 /* else, we already released it */
2727 spin_unlock(&ci->i_ceph_lock);
2731 * Handle cap IMPORT. If there are temp bits from an older EXPORT,
2734 * caller holds s_mutex.
2736 static void handle_cap_import(struct ceph_mds_client *mdsc,
2737 struct inode *inode, struct ceph_mds_caps *im,
2738 struct ceph_mds_session *session,
2739 void *snaptrace, int snaptrace_len)
2741 struct ceph_inode_info *ci = ceph_inode(inode);
2742 int mds = session->s_mds;
2743 unsigned issued = le32_to_cpu(im->caps);
2744 unsigned wanted = le32_to_cpu(im->wanted);
2745 unsigned seq = le32_to_cpu(im->seq);
2746 unsigned mseq = le32_to_cpu(im->migrate_seq);
2747 u64 realmino = le64_to_cpu(im->realm);
2748 u64 cap_id = le64_to_cpu(im->cap_id);
2750 if (ci->i_cap_exporting_mds >= 0 &&
2751 ceph_seq_cmp(ci->i_cap_exporting_mseq, mseq) < 0) {
2752 dout("handle_cap_import inode %p ci %p mds%d mseq %d"
2753 " - cleared exporting from mds%d\n",
2754 inode, ci, mds, mseq,
2755 ci->i_cap_exporting_mds);
2756 ci->i_cap_exporting_issued = 0;
2757 ci->i_cap_exporting_mseq = 0;
2758 ci->i_cap_exporting_mds = -1;
2760 spin_lock(&mdsc->cap_dirty_lock);
2761 if (!list_empty(&ci->i_dirty_item)) {
2762 dout(" moving %p back to cap_dirty\n", inode);
2763 list_move(&ci->i_dirty_item, &mdsc->cap_dirty);
2765 spin_unlock(&mdsc->cap_dirty_lock);
2767 dout("handle_cap_import inode %p ci %p mds%d mseq %d\n",
2768 inode, ci, mds, mseq);
2771 down_write(&mdsc->snap_rwsem);
2772 ceph_update_snap_trace(mdsc, snaptrace, snaptrace+snaptrace_len,
2774 downgrade_write(&mdsc->snap_rwsem);
2775 ceph_add_cap(inode, session, cap_id, -1,
2776 issued, wanted, seq, mseq, realmino, CEPH_CAP_FLAG_AUTH,
2777 NULL /* no caps context */);
2778 kick_flushing_inode_caps(mdsc, session, inode);
2779 up_read(&mdsc->snap_rwsem);
2781 /* make sure we re-request max_size, if necessary */
2782 spin_lock(&ci->i_ceph_lock);
2783 ci->i_wanted_max_size = 0; /* reset */
2784 ci->i_requested_max_size = 0;
2785 spin_unlock(&ci->i_ceph_lock);
2789 * Handle a caps message from the MDS.
2791 * Identify the appropriate session, inode, and call the right handler
2792 * based on the cap op.
2794 void ceph_handle_caps(struct ceph_mds_session *session,
2795 struct ceph_msg *msg)
2797 struct ceph_mds_client *mdsc = session->s_mdsc;
2798 struct super_block *sb = mdsc->fsc->sb;
2799 struct inode *inode;
2800 struct ceph_inode_info *ci;
2801 struct ceph_cap *cap;
2802 struct ceph_mds_caps *h;
2803 int mds = session->s_mds;
2806 struct ceph_vino vino;
2811 size_t snaptrace_len;
2814 int open_target_sessions = 0;
2816 dout("handle_caps from mds%d\n", mds);
2819 tid = le64_to_cpu(msg->hdr.tid);
2820 if (msg->front.iov_len < sizeof(*h))
2822 h = msg->front.iov_base;
2823 op = le32_to_cpu(h->op);
2824 vino.ino = le64_to_cpu(h->ino);
2825 vino.snap = CEPH_NOSNAP;
2826 cap_id = le64_to_cpu(h->cap_id);
2827 seq = le32_to_cpu(h->seq);
2828 mseq = le32_to_cpu(h->migrate_seq);
2829 size = le64_to_cpu(h->size);
2830 max_size = le64_to_cpu(h->max_size);
2833 snaptrace_len = le32_to_cpu(h->snap_trace_len);
2835 if (le16_to_cpu(msg->hdr.version) >= 2) {
2838 p = snaptrace + snaptrace_len;
2839 end = msg->front.iov_base + msg->front.iov_len;
2840 ceph_decode_32_safe(&p, end, flock_len, bad);
2847 mutex_lock(&session->s_mutex);
2849 dout(" mds%d seq %lld cap seq %u\n", session->s_mds, session->s_seq,
2852 if (op == CEPH_CAP_OP_IMPORT)
2853 ceph_add_cap_releases(mdsc, session);
2856 inode = ceph_find_inode(sb, vino);
2857 ci = ceph_inode(inode);
2858 dout(" op %s ino %llx.%llx inode %p\n", ceph_cap_op_name(op), vino.ino,
2861 dout(" i don't have ino %llx\n", vino.ino);
2863 if (op == CEPH_CAP_OP_IMPORT)
2864 __queue_cap_release(session, vino.ino, cap_id,
2866 goto flush_cap_releases;
2869 /* these will work even if we don't have a cap yet */
2871 case CEPH_CAP_OP_FLUSHSNAP_ACK:
2872 handle_cap_flushsnap_ack(inode, tid, h, session);
2875 case CEPH_CAP_OP_EXPORT:
2876 handle_cap_export(inode, h, session, &open_target_sessions);
2879 case CEPH_CAP_OP_IMPORT:
2880 handle_cap_import(mdsc, inode, h, session,
2881 snaptrace, snaptrace_len);
2884 /* the rest require a cap */
2885 spin_lock(&ci->i_ceph_lock);
2886 cap = __get_cap_for_mds(ceph_inode(inode), mds);
2888 dout(" no cap on %p ino %llx.%llx from mds%d\n",
2889 inode, ceph_ino(inode), ceph_snap(inode), mds);
2890 spin_unlock(&ci->i_ceph_lock);
2891 goto flush_cap_releases;
2894 /* note that each of these drops i_ceph_lock for us */
2896 case CEPH_CAP_OP_REVOKE:
2897 case CEPH_CAP_OP_GRANT:
2898 case CEPH_CAP_OP_IMPORT:
2899 handle_cap_grant(inode, h, session, cap, msg->middle);
2902 case CEPH_CAP_OP_FLUSH_ACK:
2903 handle_cap_flush_ack(inode, tid, h, session, cap);
2906 case CEPH_CAP_OP_TRUNC:
2907 handle_cap_trunc(inode, h, session);
2911 spin_unlock(&ci->i_ceph_lock);
2912 pr_err("ceph_handle_caps: unknown cap op %d %s\n", op,
2913 ceph_cap_op_name(op));
2920 * send any full release message to try to move things
2921 * along for the mds (who clearly thinks we still have this
2924 ceph_add_cap_releases(mdsc, session);
2925 ceph_send_cap_releases(mdsc, session);
2928 mutex_unlock(&session->s_mutex);
2932 if (open_target_sessions)
2933 ceph_mdsc_open_export_target_sessions(mdsc, session);
2937 pr_err("ceph_handle_caps: corrupt message\n");
2943 * Delayed work handler to process end of delayed cap release LRU list.
2945 void ceph_check_delayed_caps(struct ceph_mds_client *mdsc)
2947 struct ceph_inode_info *ci;
2948 int flags = CHECK_CAPS_NODELAY;
2950 dout("check_delayed_caps\n");
2952 spin_lock(&mdsc->cap_delay_lock);
2953 if (list_empty(&mdsc->cap_delay_list))
2955 ci = list_first_entry(&mdsc->cap_delay_list,
2956 struct ceph_inode_info,
2958 if ((ci->i_ceph_flags & CEPH_I_FLUSH) == 0 &&
2959 time_before(jiffies, ci->i_hold_caps_max))
2961 list_del_init(&ci->i_cap_delay_list);
2962 spin_unlock(&mdsc->cap_delay_lock);
2963 dout("check_delayed_caps on %p\n", &ci->vfs_inode);
2964 ceph_check_caps(ci, flags, NULL);
2966 spin_unlock(&mdsc->cap_delay_lock);
2970 * Flush all dirty caps to the mds
2972 void ceph_flush_dirty_caps(struct ceph_mds_client *mdsc)
2974 struct ceph_inode_info *ci;
2975 struct inode *inode;
2977 dout("flush_dirty_caps\n");
2978 spin_lock(&mdsc->cap_dirty_lock);
2979 while (!list_empty(&mdsc->cap_dirty)) {
2980 ci = list_first_entry(&mdsc->cap_dirty, struct ceph_inode_info,
2982 inode = &ci->vfs_inode;
2984 dout("flush_dirty_caps %p\n", inode);
2985 spin_unlock(&mdsc->cap_dirty_lock);
2986 ceph_check_caps(ci, CHECK_CAPS_NODELAY|CHECK_CAPS_FLUSH, NULL);
2988 spin_lock(&mdsc->cap_dirty_lock);
2990 spin_unlock(&mdsc->cap_dirty_lock);
2991 dout("flush_dirty_caps done\n");
2995 * Drop open file reference. If we were the last open file,
2996 * we may need to release capabilities to the MDS (or schedule
2997 * their delayed release).
2999 void ceph_put_fmode(struct ceph_inode_info *ci, int fmode)
3001 struct inode *inode = &ci->vfs_inode;
3004 spin_lock(&ci->i_ceph_lock);
3005 dout("put_fmode %p fmode %d %d -> %d\n", inode, fmode,
3006 ci->i_nr_by_mode[fmode], ci->i_nr_by_mode[fmode]-1);
3007 BUG_ON(ci->i_nr_by_mode[fmode] == 0);
3008 if (--ci->i_nr_by_mode[fmode] == 0)
3010 spin_unlock(&ci->i_ceph_lock);
3012 if (last && ci->i_vino.snap == CEPH_NOSNAP)
3013 ceph_check_caps(ci, 0, NULL);
3017 * Helpers for embedding cap and dentry lease releases into mds
3020 * @force is used by dentry_release (below) to force inclusion of a
3021 * record for the directory inode, even when there aren't any caps to
3024 int ceph_encode_inode_release(void **p, struct inode *inode,
3025 int mds, int drop, int unless, int force)
3027 struct ceph_inode_info *ci = ceph_inode(inode);
3028 struct ceph_cap *cap;
3029 struct ceph_mds_request_release *rel = *p;
3033 spin_lock(&ci->i_ceph_lock);
3034 used = __ceph_caps_used(ci);
3035 dirty = __ceph_caps_dirty(ci);
3037 dout("encode_inode_release %p mds%d used|dirty %s drop %s unless %s\n",
3038 inode, mds, ceph_cap_string(used|dirty), ceph_cap_string(drop),
3039 ceph_cap_string(unless));
3041 /* only drop unused, clean caps */
3042 drop &= ~(used | dirty);
3044 cap = __get_cap_for_mds(ci, mds);
3045 if (cap && __cap_is_valid(cap)) {
3047 ((cap->issued & drop) &&
3048 (cap->issued & unless) == 0)) {
3049 if ((cap->issued & drop) &&
3050 (cap->issued & unless) == 0) {
3051 int wanted = __ceph_caps_wanted(ci);
3052 if ((ci->i_ceph_flags & CEPH_I_NODELAY) == 0)
3053 wanted |= cap->mds_wanted;
3054 dout("encode_inode_release %p cap %p "
3055 "%s -> %s, wanted %s -> %s\n", inode, cap,
3056 ceph_cap_string(cap->issued),
3057 ceph_cap_string(cap->issued & ~drop),
3058 ceph_cap_string(cap->mds_wanted),
3059 ceph_cap_string(wanted));
3061 cap->issued &= ~drop;
3062 cap->implemented &= ~drop;
3063 cap->mds_wanted = wanted;
3065 dout("encode_inode_release %p cap %p %s"
3066 " (force)\n", inode, cap,
3067 ceph_cap_string(cap->issued));
3070 rel->ino = cpu_to_le64(ceph_ino(inode));
3071 rel->cap_id = cpu_to_le64(cap->cap_id);
3072 rel->seq = cpu_to_le32(cap->seq);
3073 rel->issue_seq = cpu_to_le32(cap->issue_seq),
3074 rel->mseq = cpu_to_le32(cap->mseq);
3075 rel->caps = cpu_to_le32(cap->issued);
3076 rel->wanted = cpu_to_le32(cap->mds_wanted);
3082 dout("encode_inode_release %p cap %p %s\n",
3083 inode, cap, ceph_cap_string(cap->issued));
3086 spin_unlock(&ci->i_ceph_lock);
3090 int ceph_encode_dentry_release(void **p, struct dentry *dentry,
3091 int mds, int drop, int unless)
3093 struct inode *dir = dentry->d_parent->d_inode;
3094 struct ceph_mds_request_release *rel = *p;
3095 struct ceph_dentry_info *di = ceph_dentry(dentry);
3100 * force an record for the directory caps if we have a dentry lease.
3101 * this is racy (can't take i_ceph_lock and d_lock together), but it
3102 * doesn't have to be perfect; the mds will revoke anything we don't
3105 spin_lock(&dentry->d_lock);
3106 if (di->lease_session && di->lease_session->s_mds == mds)
3108 spin_unlock(&dentry->d_lock);
3110 ret = ceph_encode_inode_release(p, dir, mds, drop, unless, force);
3112 spin_lock(&dentry->d_lock);
3113 if (ret && di->lease_session && di->lease_session->s_mds == mds) {
3114 dout("encode_dentry_release %p mds%d seq %d\n",
3115 dentry, mds, (int)di->lease_seq);
3116 rel->dname_len = cpu_to_le32(dentry->d_name.len);
3117 memcpy(*p, dentry->d_name.name, dentry->d_name.len);
3118 *p += dentry->d_name.len;
3119 rel->dname_seq = cpu_to_le32(di->lease_seq);
3120 __ceph_mdsc_drop_dentry_lease(dentry);
3122 spin_unlock(&dentry->d_lock);