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 int ceph_reserve_caps(struct ceph_mds_client *mdsc,
151 struct ceph_cap_reservation *ctx, int need)
154 struct ceph_cap *cap;
160 dout("reserve caps ctx=%p need=%d\n", ctx, need);
162 /* first reserve any caps that are already allocated */
163 spin_lock(&mdsc->caps_list_lock);
164 if (mdsc->caps_avail_count >= need)
167 have = mdsc->caps_avail_count;
168 mdsc->caps_avail_count -= have;
169 mdsc->caps_reserve_count += have;
170 BUG_ON(mdsc->caps_total_count != mdsc->caps_use_count +
171 mdsc->caps_reserve_count +
172 mdsc->caps_avail_count);
173 spin_unlock(&mdsc->caps_list_lock);
175 for (i = have; i < need; i++) {
176 cap = kmem_cache_alloc(ceph_cap_cachep, GFP_NOFS);
179 goto out_alloc_count;
181 list_add(&cap->caps_item, &newcaps);
184 BUG_ON(have + alloc != need);
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);
203 /* we didn't manage to reserve as much as we needed */
204 pr_warning("reserve caps ctx=%p ENOMEM need=%d got=%d\n",
209 int ceph_unreserve_caps(struct ceph_mds_client *mdsc,
210 struct ceph_cap_reservation *ctx)
212 dout("unreserve caps ctx=%p count=%d\n", ctx, ctx->count);
214 spin_lock(&mdsc->caps_list_lock);
215 BUG_ON(mdsc->caps_reserve_count < ctx->count);
216 mdsc->caps_reserve_count -= ctx->count;
217 mdsc->caps_avail_count += ctx->count;
219 dout("unreserve caps %d = %d used + %d resv + %d avail\n",
220 mdsc->caps_total_count, mdsc->caps_use_count,
221 mdsc->caps_reserve_count, mdsc->caps_avail_count);
222 BUG_ON(mdsc->caps_total_count != mdsc->caps_use_count +
223 mdsc->caps_reserve_count +
224 mdsc->caps_avail_count);
225 spin_unlock(&mdsc->caps_list_lock);
230 static struct ceph_cap *get_cap(struct ceph_mds_client *mdsc,
231 struct ceph_cap_reservation *ctx)
233 struct ceph_cap *cap = NULL;
235 /* temporary, until we do something about cap import/export */
237 cap = kmem_cache_alloc(ceph_cap_cachep, GFP_NOFS);
239 spin_lock(&mdsc->caps_list_lock);
240 mdsc->caps_use_count++;
241 mdsc->caps_total_count++;
242 spin_unlock(&mdsc->caps_list_lock);
247 spin_lock(&mdsc->caps_list_lock);
248 dout("get_cap ctx=%p (%d) %d = %d used + %d resv + %d avail\n",
249 ctx, ctx->count, mdsc->caps_total_count, mdsc->caps_use_count,
250 mdsc->caps_reserve_count, mdsc->caps_avail_count);
252 BUG_ON(ctx->count > mdsc->caps_reserve_count);
253 BUG_ON(list_empty(&mdsc->caps_list));
256 mdsc->caps_reserve_count--;
257 mdsc->caps_use_count++;
259 cap = list_first_entry(&mdsc->caps_list, struct ceph_cap, caps_item);
260 list_del(&cap->caps_item);
262 BUG_ON(mdsc->caps_total_count != mdsc->caps_use_count +
263 mdsc->caps_reserve_count + mdsc->caps_avail_count);
264 spin_unlock(&mdsc->caps_list_lock);
268 void ceph_put_cap(struct ceph_mds_client *mdsc, struct ceph_cap *cap)
270 spin_lock(&mdsc->caps_list_lock);
271 dout("put_cap %p %d = %d used + %d resv + %d avail\n",
272 cap, mdsc->caps_total_count, mdsc->caps_use_count,
273 mdsc->caps_reserve_count, mdsc->caps_avail_count);
274 mdsc->caps_use_count--;
276 * Keep some preallocated caps around (ceph_min_count), to
277 * avoid lots of free/alloc churn.
279 if (mdsc->caps_avail_count >= mdsc->caps_reserve_count +
280 mdsc->caps_min_count) {
281 mdsc->caps_total_count--;
282 kmem_cache_free(ceph_cap_cachep, cap);
284 mdsc->caps_avail_count++;
285 list_add(&cap->caps_item, &mdsc->caps_list);
288 BUG_ON(mdsc->caps_total_count != mdsc->caps_use_count +
289 mdsc->caps_reserve_count + mdsc->caps_avail_count);
290 spin_unlock(&mdsc->caps_list_lock);
293 void ceph_reservation_status(struct ceph_fs_client *fsc,
294 int *total, int *avail, int *used, int *reserved,
297 struct ceph_mds_client *mdsc = fsc->mdsc;
300 *total = mdsc->caps_total_count;
302 *avail = mdsc->caps_avail_count;
304 *used = mdsc->caps_use_count;
306 *reserved = mdsc->caps_reserve_count;
308 *min = mdsc->caps_min_count;
312 * Find ceph_cap for given mds, if any.
314 * Called with i_ceph_lock held.
316 static struct ceph_cap *__get_cap_for_mds(struct ceph_inode_info *ci, int mds)
318 struct ceph_cap *cap;
319 struct rb_node *n = ci->i_caps.rb_node;
322 cap = rb_entry(n, struct ceph_cap, ci_node);
325 else if (mds > cap->mds)
333 struct ceph_cap *ceph_get_cap_for_mds(struct ceph_inode_info *ci, int mds)
335 struct ceph_cap *cap;
337 spin_lock(&ci->i_ceph_lock);
338 cap = __get_cap_for_mds(ci, mds);
339 spin_unlock(&ci->i_ceph_lock);
344 * Return id of any MDS with a cap, preferably FILE_WR|BUFFER|EXCL, else -1.
346 static int __ceph_get_cap_mds(struct ceph_inode_info *ci)
348 struct ceph_cap *cap;
352 /* prefer mds with WR|BUFFER|EXCL caps */
353 for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
354 cap = rb_entry(p, struct ceph_cap, ci_node);
356 if (cap->issued & (CEPH_CAP_FILE_WR |
357 CEPH_CAP_FILE_BUFFER |
364 int ceph_get_cap_mds(struct inode *inode)
366 struct ceph_inode_info *ci = ceph_inode(inode);
368 spin_lock(&ci->i_ceph_lock);
369 mds = __ceph_get_cap_mds(ceph_inode(inode));
370 spin_unlock(&ci->i_ceph_lock);
375 * Called under i_ceph_lock.
377 static void __insert_cap_node(struct ceph_inode_info *ci,
378 struct ceph_cap *new)
380 struct rb_node **p = &ci->i_caps.rb_node;
381 struct rb_node *parent = NULL;
382 struct ceph_cap *cap = NULL;
386 cap = rb_entry(parent, struct ceph_cap, ci_node);
387 if (new->mds < cap->mds)
389 else if (new->mds > cap->mds)
395 rb_link_node(&new->ci_node, parent, p);
396 rb_insert_color(&new->ci_node, &ci->i_caps);
400 * (re)set cap hold timeouts, which control the delayed release
401 * of unused caps back to the MDS. Should be called on cap use.
403 static void __cap_set_timeouts(struct ceph_mds_client *mdsc,
404 struct ceph_inode_info *ci)
406 struct ceph_mount_options *ma = mdsc->fsc->mount_options;
408 ci->i_hold_caps_min = round_jiffies(jiffies +
409 ma->caps_wanted_delay_min * HZ);
410 ci->i_hold_caps_max = round_jiffies(jiffies +
411 ma->caps_wanted_delay_max * HZ);
412 dout("__cap_set_timeouts %p min %lu max %lu\n", &ci->vfs_inode,
413 ci->i_hold_caps_min - jiffies, ci->i_hold_caps_max - jiffies);
417 * (Re)queue cap at the end of the delayed cap release list.
419 * If I_FLUSH is set, leave the inode at the front of the list.
421 * Caller holds i_ceph_lock
422 * -> we take mdsc->cap_delay_lock
424 static void __cap_delay_requeue(struct ceph_mds_client *mdsc,
425 struct ceph_inode_info *ci)
427 __cap_set_timeouts(mdsc, ci);
428 dout("__cap_delay_requeue %p flags %d at %lu\n", &ci->vfs_inode,
429 ci->i_ceph_flags, ci->i_hold_caps_max);
430 if (!mdsc->stopping) {
431 spin_lock(&mdsc->cap_delay_lock);
432 if (!list_empty(&ci->i_cap_delay_list)) {
433 if (ci->i_ceph_flags & CEPH_I_FLUSH)
435 list_del_init(&ci->i_cap_delay_list);
437 list_add_tail(&ci->i_cap_delay_list, &mdsc->cap_delay_list);
439 spin_unlock(&mdsc->cap_delay_lock);
444 * Queue an inode for immediate writeback. Mark inode with I_FLUSH,
445 * indicating we should send a cap message to flush dirty metadata
446 * asap, and move to the front of the delayed cap list.
448 static void __cap_delay_requeue_front(struct ceph_mds_client *mdsc,
449 struct ceph_inode_info *ci)
451 dout("__cap_delay_requeue_front %p\n", &ci->vfs_inode);
452 spin_lock(&mdsc->cap_delay_lock);
453 ci->i_ceph_flags |= CEPH_I_FLUSH;
454 if (!list_empty(&ci->i_cap_delay_list))
455 list_del_init(&ci->i_cap_delay_list);
456 list_add(&ci->i_cap_delay_list, &mdsc->cap_delay_list);
457 spin_unlock(&mdsc->cap_delay_lock);
461 * Cancel delayed work on cap.
463 * Caller must hold i_ceph_lock.
465 static void __cap_delay_cancel(struct ceph_mds_client *mdsc,
466 struct ceph_inode_info *ci)
468 dout("__cap_delay_cancel %p\n", &ci->vfs_inode);
469 if (list_empty(&ci->i_cap_delay_list))
471 spin_lock(&mdsc->cap_delay_lock);
472 list_del_init(&ci->i_cap_delay_list);
473 spin_unlock(&mdsc->cap_delay_lock);
477 * Common issue checks for add_cap, handle_cap_grant.
479 static void __check_cap_issue(struct ceph_inode_info *ci, struct ceph_cap *cap,
482 unsigned had = __ceph_caps_issued(ci, NULL);
485 * Each time we receive FILE_CACHE anew, we increment
488 if ((issued & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) &&
489 (had & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) == 0)
493 * if we are newly issued FILE_SHARED, clear D_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 ceph_dir_clear_complete(&ci->vfs_inode);
506 * Add a capability under the given MDS session.
508 * Caller should hold session snap_rwsem (read) and s_mutex.
510 * @fmode is the open file mode, if we are opening a file, otherwise
511 * it is < 0. (This is so we can atomically add the cap and add an
512 * open file reference to it.)
514 int ceph_add_cap(struct inode *inode,
515 struct ceph_mds_session *session, u64 cap_id,
516 int fmode, unsigned issued, unsigned wanted,
517 unsigned seq, unsigned mseq, u64 realmino, int flags,
518 struct ceph_cap_reservation *caps_reservation)
520 struct ceph_mds_client *mdsc = ceph_inode_to_client(inode)->mdsc;
521 struct ceph_inode_info *ci = ceph_inode(inode);
522 struct ceph_cap *new_cap = NULL;
523 struct ceph_cap *cap;
524 int mds = session->s_mds;
527 dout("add_cap %p mds%d cap %llx %s seq %d\n", inode,
528 session->s_mds, cap_id, ceph_cap_string(issued), seq);
531 * If we are opening the file, include file mode wanted bits
535 wanted |= ceph_caps_for_mode(fmode);
538 spin_lock(&ci->i_ceph_lock);
539 cap = __get_cap_for_mds(ci, mds);
545 spin_unlock(&ci->i_ceph_lock);
546 new_cap = get_cap(mdsc, caps_reservation);
553 cap->implemented = 0;
558 __insert_cap_node(ci, cap);
560 /* clear out old exporting info? (i.e. on cap import) */
561 if (ci->i_cap_exporting_mds == mds) {
562 ci->i_cap_exporting_issued = 0;
563 ci->i_cap_exporting_mseq = 0;
564 ci->i_cap_exporting_mds = -1;
567 /* add to session cap list */
568 cap->session = session;
569 spin_lock(&session->s_cap_lock);
570 list_add_tail(&cap->session_caps, &session->s_caps);
571 session->s_nr_caps++;
572 spin_unlock(&session->s_cap_lock);
574 ceph_put_cap(mdsc, new_cap);
576 if (!ci->i_snap_realm) {
578 * add this inode to the appropriate snap realm
580 struct ceph_snap_realm *realm = ceph_lookup_snap_realm(mdsc,
583 ceph_get_snap_realm(mdsc, realm);
584 spin_lock(&realm->inodes_with_caps_lock);
585 ci->i_snap_realm = realm;
586 list_add(&ci->i_snap_realm_item,
587 &realm->inodes_with_caps);
588 spin_unlock(&realm->inodes_with_caps_lock);
590 pr_err("ceph_add_cap: couldn't find snap realm %llx\n",
596 __check_cap_issue(ci, cap, issued);
599 * If we are issued caps we don't want, or the mds' wanted
600 * value appears to be off, queue a check so we'll release
601 * later and/or update the mds wanted value.
603 actual_wanted = __ceph_caps_wanted(ci);
604 if ((wanted & ~actual_wanted) ||
605 (issued & ~actual_wanted & CEPH_CAP_ANY_WR)) {
606 dout(" issued %s, mds wanted %s, actual %s, queueing\n",
607 ceph_cap_string(issued), ceph_cap_string(wanted),
608 ceph_cap_string(actual_wanted));
609 __cap_delay_requeue(mdsc, ci);
612 if (flags & CEPH_CAP_FLAG_AUTH)
613 ci->i_auth_cap = cap;
614 else if (ci->i_auth_cap == cap) {
615 ci->i_auth_cap = NULL;
616 spin_lock(&mdsc->cap_dirty_lock);
617 if (!list_empty(&ci->i_dirty_item)) {
618 dout(" moving %p to cap_dirty_migrating\n", inode);
619 list_move(&ci->i_dirty_item,
620 &mdsc->cap_dirty_migrating);
622 spin_unlock(&mdsc->cap_dirty_lock);
625 dout("add_cap inode %p (%llx.%llx) cap %p %s now %s seq %d mds%d\n",
626 inode, ceph_vinop(inode), cap, ceph_cap_string(issued),
627 ceph_cap_string(issued|cap->issued), seq, mds);
628 cap->cap_id = cap_id;
629 cap->issued = issued;
630 cap->implemented |= issued;
631 cap->mds_wanted |= wanted;
633 cap->issue_seq = seq;
635 cap->cap_gen = session->s_cap_gen;
638 __ceph_get_fmode(ci, fmode);
639 spin_unlock(&ci->i_ceph_lock);
640 wake_up_all(&ci->i_cap_wq);
645 * Return true if cap has not timed out and belongs to the current
646 * generation of the MDS session (i.e. has not gone 'stale' due to
647 * us losing touch with the mds).
649 static int __cap_is_valid(struct ceph_cap *cap)
654 spin_lock(&cap->session->s_gen_ttl_lock);
655 gen = cap->session->s_cap_gen;
656 ttl = cap->session->s_cap_ttl;
657 spin_unlock(&cap->session->s_gen_ttl_lock);
659 if (cap->cap_gen < gen || time_after_eq(jiffies, ttl)) {
660 dout("__cap_is_valid %p cap %p issued %s "
661 "but STALE (gen %u vs %u)\n", &cap->ci->vfs_inode,
662 cap, ceph_cap_string(cap->issued), cap->cap_gen, gen);
670 * Return set of valid cap bits issued to us. Note that caps time
671 * out, and may be invalidated in bulk if the client session times out
672 * and session->s_cap_gen is bumped.
674 int __ceph_caps_issued(struct ceph_inode_info *ci, int *implemented)
676 int have = ci->i_snap_caps | ci->i_cap_exporting_issued;
677 struct ceph_cap *cap;
682 for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
683 cap = rb_entry(p, struct ceph_cap, ci_node);
684 if (!__cap_is_valid(cap))
686 dout("__ceph_caps_issued %p cap %p issued %s\n",
687 &ci->vfs_inode, cap, ceph_cap_string(cap->issued));
690 *implemented |= cap->implemented;
696 * Get cap bits issued by caps other than @ocap
698 int __ceph_caps_issued_other(struct ceph_inode_info *ci, struct ceph_cap *ocap)
700 int have = ci->i_snap_caps;
701 struct ceph_cap *cap;
704 for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
705 cap = rb_entry(p, struct ceph_cap, ci_node);
708 if (!__cap_is_valid(cap))
716 * Move a cap to the end of the LRU (oldest caps at list head, newest
719 static void __touch_cap(struct ceph_cap *cap)
721 struct ceph_mds_session *s = cap->session;
723 spin_lock(&s->s_cap_lock);
724 if (s->s_cap_iterator == NULL) {
725 dout("__touch_cap %p cap %p mds%d\n", &cap->ci->vfs_inode, cap,
727 list_move_tail(&cap->session_caps, &s->s_caps);
729 dout("__touch_cap %p cap %p mds%d NOP, iterating over caps\n",
730 &cap->ci->vfs_inode, cap, s->s_mds);
732 spin_unlock(&s->s_cap_lock);
736 * Check if we hold the given mask. If so, move the cap(s) to the
737 * front of their respective LRUs. (This is the preferred way for
738 * callers to check for caps they want.)
740 int __ceph_caps_issued_mask(struct ceph_inode_info *ci, int mask, int touch)
742 struct ceph_cap *cap;
744 int have = ci->i_snap_caps;
746 if ((have & mask) == mask) {
747 dout("__ceph_caps_issued_mask %p snap issued %s"
748 " (mask %s)\n", &ci->vfs_inode,
749 ceph_cap_string(have),
750 ceph_cap_string(mask));
754 for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
755 cap = rb_entry(p, struct ceph_cap, ci_node);
756 if (!__cap_is_valid(cap))
758 if ((cap->issued & mask) == mask) {
759 dout("__ceph_caps_issued_mask %p cap %p issued %s"
760 " (mask %s)\n", &ci->vfs_inode, cap,
761 ceph_cap_string(cap->issued),
762 ceph_cap_string(mask));
768 /* does a combination of caps satisfy mask? */
770 if ((have & mask) == mask) {
771 dout("__ceph_caps_issued_mask %p combo issued %s"
772 " (mask %s)\n", &ci->vfs_inode,
773 ceph_cap_string(cap->issued),
774 ceph_cap_string(mask));
778 /* touch this + preceding caps */
780 for (q = rb_first(&ci->i_caps); q != p;
782 cap = rb_entry(q, struct ceph_cap,
784 if (!__cap_is_valid(cap))
797 * Return true if mask caps are currently being revoked by an MDS.
799 int ceph_caps_revoking(struct ceph_inode_info *ci, int mask)
801 struct inode *inode = &ci->vfs_inode;
802 struct ceph_cap *cap;
806 spin_lock(&ci->i_ceph_lock);
807 for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
808 cap = rb_entry(p, struct ceph_cap, ci_node);
809 if (__cap_is_valid(cap) &&
810 (cap->implemented & ~cap->issued & mask)) {
815 spin_unlock(&ci->i_ceph_lock);
816 dout("ceph_caps_revoking %p %s = %d\n", inode,
817 ceph_cap_string(mask), ret);
821 int __ceph_caps_used(struct ceph_inode_info *ci)
825 used |= CEPH_CAP_PIN;
827 used |= CEPH_CAP_FILE_RD;
828 if (ci->i_rdcache_ref || ci->vfs_inode.i_data.nrpages)
829 used |= CEPH_CAP_FILE_CACHE;
831 used |= CEPH_CAP_FILE_WR;
832 if (ci->i_wb_ref || ci->i_wrbuffer_ref)
833 used |= CEPH_CAP_FILE_BUFFER;
838 * wanted, by virtue of open file modes
840 int __ceph_caps_file_wanted(struct ceph_inode_info *ci)
844 for (mode = 0; mode < CEPH_FILE_MODE_NUM; mode++)
845 if (ci->i_nr_by_mode[mode])
846 want |= ceph_caps_for_mode(mode);
851 * Return caps we have registered with the MDS(s) as 'wanted'.
853 int __ceph_caps_mds_wanted(struct ceph_inode_info *ci)
855 struct ceph_cap *cap;
859 for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
860 cap = rb_entry(p, struct ceph_cap, ci_node);
861 if (!__cap_is_valid(cap))
863 mds_wanted |= cap->mds_wanted;
869 * called under i_ceph_lock
871 static int __ceph_is_any_caps(struct ceph_inode_info *ci)
873 return !RB_EMPTY_ROOT(&ci->i_caps) || ci->i_cap_exporting_mds >= 0;
877 * Remove a cap. Take steps to deal with a racing iterate_session_caps.
879 * caller should hold i_ceph_lock.
880 * caller will not hold session s_mutex if called from destroy_inode.
882 void __ceph_remove_cap(struct ceph_cap *cap)
884 struct ceph_mds_session *session = cap->session;
885 struct ceph_inode_info *ci = cap->ci;
886 struct ceph_mds_client *mdsc =
887 ceph_sb_to_client(ci->vfs_inode.i_sb)->mdsc;
890 dout("__ceph_remove_cap %p from %p\n", cap, &ci->vfs_inode);
892 /* remove from session list */
893 spin_lock(&session->s_cap_lock);
894 if (session->s_cap_iterator == cap) {
895 /* not yet, we are iterating over this very cap */
896 dout("__ceph_remove_cap delaying %p removal from session %p\n",
899 list_del_init(&cap->session_caps);
900 session->s_nr_caps--;
904 /* protect backpointer with s_cap_lock: see iterate_session_caps */
906 spin_unlock(&session->s_cap_lock);
908 /* remove from inode list */
909 rb_erase(&cap->ci_node, &ci->i_caps);
910 if (ci->i_auth_cap == cap)
911 ci->i_auth_cap = NULL;
914 ceph_put_cap(mdsc, cap);
916 if (!__ceph_is_any_caps(ci) && ci->i_snap_realm) {
917 struct ceph_snap_realm *realm = ci->i_snap_realm;
918 spin_lock(&realm->inodes_with_caps_lock);
919 list_del_init(&ci->i_snap_realm_item);
920 ci->i_snap_realm_counter++;
921 ci->i_snap_realm = NULL;
922 spin_unlock(&realm->inodes_with_caps_lock);
923 ceph_put_snap_realm(mdsc, realm);
925 if (!__ceph_is_any_real_caps(ci))
926 __cap_delay_cancel(mdsc, ci);
930 * Build and send a cap message to the given MDS.
932 * Caller should be holding s_mutex.
934 static int send_cap_msg(struct ceph_mds_session *session,
935 u64 ino, u64 cid, int op,
936 int caps, int wanted, int dirty,
937 u32 seq, u64 flush_tid, u32 issue_seq, u32 mseq,
938 u64 size, u64 max_size,
939 struct timespec *mtime, struct timespec *atime,
941 kuid_t uid, kgid_t gid, umode_t mode,
943 struct ceph_buffer *xattrs_buf,
946 struct ceph_mds_caps *fc;
947 struct ceph_msg *msg;
949 dout("send_cap_msg %s %llx %llx caps %s wanted %s dirty %s"
950 " seq %u/%u mseq %u follows %lld size %llu/%llu"
951 " xattr_ver %llu xattr_len %d\n", ceph_cap_op_name(op),
952 cid, ino, ceph_cap_string(caps), ceph_cap_string(wanted),
953 ceph_cap_string(dirty),
954 seq, issue_seq, mseq, follows, size, max_size,
955 xattr_version, xattrs_buf ? (int)xattrs_buf->vec.iov_len : 0);
957 msg = ceph_msg_new(CEPH_MSG_CLIENT_CAPS, sizeof(*fc), GFP_NOFS, false);
961 msg->hdr.tid = cpu_to_le64(flush_tid);
963 fc = msg->front.iov_base;
964 memset(fc, 0, sizeof(*fc));
966 fc->cap_id = cpu_to_le64(cid);
967 fc->op = cpu_to_le32(op);
968 fc->seq = cpu_to_le32(seq);
969 fc->issue_seq = cpu_to_le32(issue_seq);
970 fc->migrate_seq = cpu_to_le32(mseq);
971 fc->caps = cpu_to_le32(caps);
972 fc->wanted = cpu_to_le32(wanted);
973 fc->dirty = cpu_to_le32(dirty);
974 fc->ino = cpu_to_le64(ino);
975 fc->snap_follows = cpu_to_le64(follows);
977 fc->size = cpu_to_le64(size);
978 fc->max_size = cpu_to_le64(max_size);
980 ceph_encode_timespec(&fc->mtime, mtime);
982 ceph_encode_timespec(&fc->atime, atime);
983 fc->time_warp_seq = cpu_to_le32(time_warp_seq);
985 fc->uid = cpu_to_le32(from_kuid(&init_user_ns, uid));
986 fc->gid = cpu_to_le32(from_kgid(&init_user_ns, gid));
987 fc->mode = cpu_to_le32(mode);
989 fc->xattr_version = cpu_to_le64(xattr_version);
991 msg->middle = ceph_buffer_get(xattrs_buf);
992 fc->xattr_len = cpu_to_le32(xattrs_buf->vec.iov_len);
993 msg->hdr.middle_len = cpu_to_le32(xattrs_buf->vec.iov_len);
996 ceph_con_send(&session->s_con, msg);
1000 static void __queue_cap_release(struct ceph_mds_session *session,
1001 u64 ino, u64 cap_id, u32 migrate_seq,
1004 struct ceph_msg *msg;
1005 struct ceph_mds_cap_release *head;
1006 struct ceph_mds_cap_item *item;
1008 spin_lock(&session->s_cap_lock);
1009 BUG_ON(!session->s_num_cap_releases);
1010 msg = list_first_entry(&session->s_cap_releases,
1011 struct ceph_msg, list_head);
1013 dout(" adding %llx release to mds%d msg %p (%d left)\n",
1014 ino, session->s_mds, msg, session->s_num_cap_releases);
1016 BUG_ON(msg->front.iov_len + sizeof(*item) > PAGE_CACHE_SIZE);
1017 head = msg->front.iov_base;
1018 le32_add_cpu(&head->num, 1);
1019 item = msg->front.iov_base + msg->front.iov_len;
1020 item->ino = cpu_to_le64(ino);
1021 item->cap_id = cpu_to_le64(cap_id);
1022 item->migrate_seq = cpu_to_le32(migrate_seq);
1023 item->seq = cpu_to_le32(issue_seq);
1025 session->s_num_cap_releases--;
1027 msg->front.iov_len += sizeof(*item);
1028 if (le32_to_cpu(head->num) == CEPH_CAPS_PER_RELEASE) {
1029 dout(" release msg %p full\n", msg);
1030 list_move_tail(&msg->list_head, &session->s_cap_releases_done);
1032 dout(" release msg %p at %d/%d (%d)\n", msg,
1033 (int)le32_to_cpu(head->num),
1034 (int)CEPH_CAPS_PER_RELEASE,
1035 (int)msg->front.iov_len);
1037 spin_unlock(&session->s_cap_lock);
1041 * Queue cap releases when an inode is dropped from our cache. Since
1042 * inode is about to be destroyed, there is no need for i_ceph_lock.
1044 void ceph_queue_caps_release(struct inode *inode)
1046 struct ceph_inode_info *ci = ceph_inode(inode);
1049 p = rb_first(&ci->i_caps);
1051 struct ceph_cap *cap = rb_entry(p, struct ceph_cap, ci_node);
1052 struct ceph_mds_session *session = cap->session;
1054 __queue_cap_release(session, ceph_ino(inode), cap->cap_id,
1055 cap->mseq, cap->issue_seq);
1057 __ceph_remove_cap(cap);
1062 * Send a cap msg on the given inode. Update our caps state, then
1063 * drop i_ceph_lock and send the message.
1065 * Make note of max_size reported/requested from mds, revoked caps
1066 * that have now been implemented.
1068 * Make half-hearted attempt ot to invalidate page cache if we are
1069 * dropping RDCACHE. Note that this will leave behind locked pages
1070 * that we'll then need to deal with elsewhere.
1072 * Return non-zero if delayed release, or we experienced an error
1073 * such that the caller should requeue + retry later.
1075 * called with i_ceph_lock, then drops it.
1076 * caller should hold snap_rwsem (read), s_mutex.
1078 static int __send_cap(struct ceph_mds_client *mdsc, struct ceph_cap *cap,
1079 int op, int used, int want, int retain, int flushing,
1080 unsigned *pflush_tid)
1081 __releases(cap->ci->i_ceph_lock)
1083 struct ceph_inode_info *ci = cap->ci;
1084 struct inode *inode = &ci->vfs_inode;
1085 u64 cap_id = cap->cap_id;
1086 int held, revoking, dropping, keep;
1087 u64 seq, issue_seq, mseq, time_warp_seq, follows;
1089 struct timespec mtime, atime;
1094 struct ceph_mds_session *session;
1095 u64 xattr_version = 0;
1096 struct ceph_buffer *xattr_blob = NULL;
1102 held = cap->issued | cap->implemented;
1103 revoking = cap->implemented & ~cap->issued;
1104 retain &= ~revoking;
1105 dropping = cap->issued & ~retain;
1107 dout("__send_cap %p cap %p session %p %s -> %s (revoking %s)\n",
1108 inode, cap, cap->session,
1109 ceph_cap_string(held), ceph_cap_string(held & retain),
1110 ceph_cap_string(revoking));
1111 BUG_ON((retain & CEPH_CAP_PIN) == 0);
1113 session = cap->session;
1115 /* don't release wanted unless we've waited a bit. */
1116 if ((ci->i_ceph_flags & CEPH_I_NODELAY) == 0 &&
1117 time_before(jiffies, ci->i_hold_caps_min)) {
1118 dout(" delaying issued %s -> %s, wanted %s -> %s on send\n",
1119 ceph_cap_string(cap->issued),
1120 ceph_cap_string(cap->issued & retain),
1121 ceph_cap_string(cap->mds_wanted),
1122 ceph_cap_string(want));
1123 want |= cap->mds_wanted;
1124 retain |= cap->issued;
1127 ci->i_ceph_flags &= ~(CEPH_I_NODELAY | CEPH_I_FLUSH);
1129 cap->issued &= retain; /* drop bits we don't want */
1130 if (cap->implemented & ~cap->issued) {
1132 * Wake up any waiters on wanted -> needed transition.
1133 * This is due to the weird transition from buffered
1134 * to sync IO... we need to flush dirty pages _before_
1135 * allowing sync writes to avoid reordering.
1139 cap->implemented &= cap->issued | used;
1140 cap->mds_wanted = want;
1144 * assign a tid for flush operations so we can avoid
1145 * flush1 -> dirty1 -> flush2 -> flushack1 -> mark
1146 * clean type races. track latest tid for every bit
1147 * so we can handle flush AxFw, flush Fw, and have the
1148 * first ack clean Ax.
1150 flush_tid = ++ci->i_cap_flush_last_tid;
1152 *pflush_tid = flush_tid;
1153 dout(" cap_flush_tid %d\n", (int)flush_tid);
1154 for (i = 0; i < CEPH_CAP_BITS; i++)
1155 if (flushing & (1 << i))
1156 ci->i_cap_flush_tid[i] = flush_tid;
1158 follows = ci->i_head_snapc->seq;
1163 keep = cap->implemented;
1165 issue_seq = cap->issue_seq;
1167 size = inode->i_size;
1168 ci->i_reported_size = size;
1169 max_size = ci->i_wanted_max_size;
1170 ci->i_requested_max_size = max_size;
1171 mtime = inode->i_mtime;
1172 atime = inode->i_atime;
1173 time_warp_seq = ci->i_time_warp_seq;
1176 mode = inode->i_mode;
1178 if (flushing & CEPH_CAP_XATTR_EXCL) {
1179 __ceph_build_xattrs_blob(ci);
1180 xattr_blob = ci->i_xattrs.blob;
1181 xattr_version = ci->i_xattrs.version;
1184 spin_unlock(&ci->i_ceph_lock);
1186 ret = send_cap_msg(session, ceph_vino(inode).ino, cap_id,
1187 op, keep, want, flushing, seq, flush_tid, issue_seq, mseq,
1188 size, max_size, &mtime, &atime, time_warp_seq,
1189 uid, gid, mode, xattr_version, xattr_blob,
1192 dout("error sending cap msg, must requeue %p\n", inode);
1197 wake_up_all(&ci->i_cap_wq);
1203 * When a snapshot is taken, clients accumulate dirty metadata on
1204 * inodes with capabilities in ceph_cap_snaps to describe the file
1205 * state at the time the snapshot was taken. This must be flushed
1206 * asynchronously back to the MDS once sync writes complete and dirty
1207 * data is written out.
1209 * Unless @again is true, skip cap_snaps that were already sent to
1210 * the MDS (i.e., during this session).
1212 * Called under i_ceph_lock. Takes s_mutex as needed.
1214 void __ceph_flush_snaps(struct ceph_inode_info *ci,
1215 struct ceph_mds_session **psession,
1217 __releases(ci->i_ceph_lock)
1218 __acquires(ci->i_ceph_lock)
1220 struct inode *inode = &ci->vfs_inode;
1222 struct ceph_cap_snap *capsnap;
1224 struct ceph_mds_client *mdsc = ceph_inode_to_client(inode)->mdsc;
1225 struct ceph_mds_session *session = NULL; /* if session != NULL, we hold
1227 u64 next_follows = 0; /* keep track of how far we've gotten through the
1228 i_cap_snaps list, and skip these entries next time
1229 around to avoid an infinite loop */
1232 session = *psession;
1234 dout("__flush_snaps %p\n", inode);
1236 list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) {
1237 /* avoid an infiniute loop after retry */
1238 if (capsnap->follows < next_follows)
1241 * we need to wait for sync writes to complete and for dirty
1242 * pages to be written out.
1244 if (capsnap->dirty_pages || capsnap->writing)
1248 * if cap writeback already occurred, we should have dropped
1249 * the capsnap in ceph_put_wrbuffer_cap_refs.
1251 BUG_ON(capsnap->dirty == 0);
1253 /* pick mds, take s_mutex */
1254 if (ci->i_auth_cap == NULL) {
1255 dout("no auth cap (migrating?), doing nothing\n");
1259 /* only flush each capsnap once */
1260 if (!again && !list_empty(&capsnap->flushing_item)) {
1261 dout("already flushed %p, skipping\n", capsnap);
1265 mds = ci->i_auth_cap->session->s_mds;
1266 mseq = ci->i_auth_cap->mseq;
1268 if (session && session->s_mds != mds) {
1269 dout("oops, wrong session %p mutex\n", session);
1270 mutex_unlock(&session->s_mutex);
1271 ceph_put_mds_session(session);
1275 spin_unlock(&ci->i_ceph_lock);
1276 mutex_lock(&mdsc->mutex);
1277 session = __ceph_lookup_mds_session(mdsc, mds);
1278 mutex_unlock(&mdsc->mutex);
1280 dout("inverting session/ino locks on %p\n",
1282 mutex_lock(&session->s_mutex);
1285 * if session == NULL, we raced against a cap
1286 * deletion or migration. retry, and we'll
1287 * get a better @mds value next time.
1289 spin_lock(&ci->i_ceph_lock);
1293 capsnap->flush_tid = ++ci->i_cap_flush_last_tid;
1294 atomic_inc(&capsnap->nref);
1295 if (!list_empty(&capsnap->flushing_item))
1296 list_del_init(&capsnap->flushing_item);
1297 list_add_tail(&capsnap->flushing_item,
1298 &session->s_cap_snaps_flushing);
1299 spin_unlock(&ci->i_ceph_lock);
1301 dout("flush_snaps %p cap_snap %p follows %lld tid %llu\n",
1302 inode, capsnap, capsnap->follows, capsnap->flush_tid);
1303 send_cap_msg(session, ceph_vino(inode).ino, 0,
1304 CEPH_CAP_OP_FLUSHSNAP, capsnap->issued, 0,
1305 capsnap->dirty, 0, capsnap->flush_tid, 0, mseq,
1307 &capsnap->mtime, &capsnap->atime,
1308 capsnap->time_warp_seq,
1309 capsnap->uid, capsnap->gid, capsnap->mode,
1310 capsnap->xattr_version, capsnap->xattr_blob,
1313 next_follows = capsnap->follows + 1;
1314 ceph_put_cap_snap(capsnap);
1316 spin_lock(&ci->i_ceph_lock);
1320 /* we flushed them all; remove this inode from the queue */
1321 spin_lock(&mdsc->snap_flush_lock);
1322 list_del_init(&ci->i_snap_flush_item);
1323 spin_unlock(&mdsc->snap_flush_lock);
1327 *psession = session;
1329 mutex_unlock(&session->s_mutex);
1330 ceph_put_mds_session(session);
1334 static void ceph_flush_snaps(struct ceph_inode_info *ci)
1336 spin_lock(&ci->i_ceph_lock);
1337 __ceph_flush_snaps(ci, NULL, 0);
1338 spin_unlock(&ci->i_ceph_lock);
1342 * Mark caps dirty. If inode is newly dirty, return the dirty flags.
1343 * Caller is then responsible for calling __mark_inode_dirty with the
1344 * returned flags value.
1346 int __ceph_mark_dirty_caps(struct ceph_inode_info *ci, int mask)
1348 struct ceph_mds_client *mdsc =
1349 ceph_sb_to_client(ci->vfs_inode.i_sb)->mdsc;
1350 struct inode *inode = &ci->vfs_inode;
1351 int was = ci->i_dirty_caps;
1354 dout("__mark_dirty_caps %p %s dirty %s -> %s\n", &ci->vfs_inode,
1355 ceph_cap_string(mask), ceph_cap_string(was),
1356 ceph_cap_string(was | mask));
1357 ci->i_dirty_caps |= mask;
1359 if (!ci->i_head_snapc)
1360 ci->i_head_snapc = ceph_get_snap_context(
1361 ci->i_snap_realm->cached_context);
1362 dout(" inode %p now dirty snapc %p auth cap %p\n",
1363 &ci->vfs_inode, ci->i_head_snapc, ci->i_auth_cap);
1364 BUG_ON(!list_empty(&ci->i_dirty_item));
1365 spin_lock(&mdsc->cap_dirty_lock);
1367 list_add(&ci->i_dirty_item, &mdsc->cap_dirty);
1369 list_add(&ci->i_dirty_item,
1370 &mdsc->cap_dirty_migrating);
1371 spin_unlock(&mdsc->cap_dirty_lock);
1372 if (ci->i_flushing_caps == 0) {
1374 dirty |= I_DIRTY_SYNC;
1377 BUG_ON(list_empty(&ci->i_dirty_item));
1378 if (((was | ci->i_flushing_caps) & CEPH_CAP_FILE_BUFFER) &&
1379 (mask & CEPH_CAP_FILE_BUFFER))
1380 dirty |= I_DIRTY_DATASYNC;
1381 __cap_delay_requeue(mdsc, ci);
1386 * Add dirty inode to the flushing list. Assigned a seq number so we
1387 * can wait for caps to flush without starving.
1389 * Called under i_ceph_lock.
1391 static int __mark_caps_flushing(struct inode *inode,
1392 struct ceph_mds_session *session)
1394 struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
1395 struct ceph_inode_info *ci = ceph_inode(inode);
1398 BUG_ON(ci->i_dirty_caps == 0);
1399 BUG_ON(list_empty(&ci->i_dirty_item));
1401 flushing = ci->i_dirty_caps;
1402 dout("__mark_caps_flushing flushing %s, flushing_caps %s -> %s\n",
1403 ceph_cap_string(flushing),
1404 ceph_cap_string(ci->i_flushing_caps),
1405 ceph_cap_string(ci->i_flushing_caps | flushing));
1406 ci->i_flushing_caps |= flushing;
1407 ci->i_dirty_caps = 0;
1408 dout(" inode %p now !dirty\n", inode);
1410 spin_lock(&mdsc->cap_dirty_lock);
1411 list_del_init(&ci->i_dirty_item);
1413 ci->i_cap_flush_seq = ++mdsc->cap_flush_seq;
1414 if (list_empty(&ci->i_flushing_item)) {
1415 list_add_tail(&ci->i_flushing_item, &session->s_cap_flushing);
1416 mdsc->num_cap_flushing++;
1417 dout(" inode %p now flushing seq %lld\n", inode,
1418 ci->i_cap_flush_seq);
1420 list_move_tail(&ci->i_flushing_item, &session->s_cap_flushing);
1421 dout(" inode %p now flushing (more) seq %lld\n", inode,
1422 ci->i_cap_flush_seq);
1424 spin_unlock(&mdsc->cap_dirty_lock);
1430 * try to invalidate mapping pages without blocking.
1432 static int try_nonblocking_invalidate(struct inode *inode)
1434 struct ceph_inode_info *ci = ceph_inode(inode);
1435 u32 invalidating_gen = ci->i_rdcache_gen;
1437 spin_unlock(&ci->i_ceph_lock);
1438 invalidate_mapping_pages(&inode->i_data, 0, -1);
1439 spin_lock(&ci->i_ceph_lock);
1441 if (inode->i_data.nrpages == 0 &&
1442 invalidating_gen == ci->i_rdcache_gen) {
1444 dout("try_nonblocking_invalidate %p success\n", inode);
1445 /* save any racing async invalidate some trouble */
1446 ci->i_rdcache_revoking = ci->i_rdcache_gen - 1;
1449 dout("try_nonblocking_invalidate %p failed\n", inode);
1454 * Swiss army knife function to examine currently used and wanted
1455 * versus held caps. Release, flush, ack revoked caps to mds as
1458 * CHECK_CAPS_NODELAY - caller is delayed work and we should not delay
1459 * cap release further.
1460 * CHECK_CAPS_AUTHONLY - we should only check the auth cap
1461 * CHECK_CAPS_FLUSH - we should flush any dirty caps immediately, without
1464 void ceph_check_caps(struct ceph_inode_info *ci, int flags,
1465 struct ceph_mds_session *session)
1467 struct ceph_fs_client *fsc = ceph_inode_to_client(&ci->vfs_inode);
1468 struct ceph_mds_client *mdsc = fsc->mdsc;
1469 struct inode *inode = &ci->vfs_inode;
1470 struct ceph_cap *cap;
1471 int file_wanted, used, cap_used;
1472 int took_snap_rwsem = 0; /* true if mdsc->snap_rwsem held */
1473 int issued, implemented, want, retain, revoking, flushing = 0;
1474 int mds = -1; /* keep track of how far we've gone through i_caps list
1475 to avoid an infinite loop on retry */
1477 int tried_invalidate = 0;
1478 int delayed = 0, sent = 0, force_requeue = 0, num;
1479 int queue_invalidate = 0;
1480 int is_delayed = flags & CHECK_CAPS_NODELAY;
1482 /* if we are unmounting, flush any unused caps immediately. */
1486 spin_lock(&ci->i_ceph_lock);
1488 if (ci->i_ceph_flags & CEPH_I_FLUSH)
1489 flags |= CHECK_CAPS_FLUSH;
1491 /* flush snaps first time around only */
1492 if (!list_empty(&ci->i_cap_snaps))
1493 __ceph_flush_snaps(ci, &session, 0);
1496 spin_lock(&ci->i_ceph_lock);
1498 file_wanted = __ceph_caps_file_wanted(ci);
1499 used = __ceph_caps_used(ci);
1500 want = file_wanted | used;
1501 issued = __ceph_caps_issued(ci, &implemented);
1502 revoking = implemented & ~issued;
1504 retain = want | CEPH_CAP_PIN;
1505 if (!mdsc->stopping && inode->i_nlink > 0) {
1507 retain |= CEPH_CAP_ANY; /* be greedy */
1509 retain |= CEPH_CAP_ANY_SHARED;
1511 * keep RD only if we didn't have the file open RW,
1512 * because then the mds would revoke it anyway to
1513 * journal max_size=0.
1515 if (ci->i_max_size == 0)
1516 retain |= CEPH_CAP_ANY_RD;
1520 dout("check_caps %p file_want %s used %s dirty %s flushing %s"
1521 " issued %s revoking %s retain %s %s%s%s\n", inode,
1522 ceph_cap_string(file_wanted),
1523 ceph_cap_string(used), ceph_cap_string(ci->i_dirty_caps),
1524 ceph_cap_string(ci->i_flushing_caps),
1525 ceph_cap_string(issued), ceph_cap_string(revoking),
1526 ceph_cap_string(retain),
1527 (flags & CHECK_CAPS_AUTHONLY) ? " AUTHONLY" : "",
1528 (flags & CHECK_CAPS_NODELAY) ? " NODELAY" : "",
1529 (flags & CHECK_CAPS_FLUSH) ? " FLUSH" : "");
1532 * If we no longer need to hold onto old our caps, and we may
1533 * have cached pages, but don't want them, then try to invalidate.
1534 * If we fail, it's because pages are locked.... try again later.
1536 if ((!is_delayed || mdsc->stopping) &&
1537 ci->i_wrbuffer_ref == 0 && /* no dirty pages... */
1538 inode->i_data.nrpages && /* have cached pages */
1539 (file_wanted == 0 || /* no open files */
1540 (revoking & (CEPH_CAP_FILE_CACHE|
1541 CEPH_CAP_FILE_LAZYIO))) && /* or revoking cache */
1542 !tried_invalidate) {
1543 dout("check_caps trying to invalidate on %p\n", inode);
1544 if (try_nonblocking_invalidate(inode) < 0) {
1545 if (revoking & (CEPH_CAP_FILE_CACHE|
1546 CEPH_CAP_FILE_LAZYIO)) {
1547 dout("check_caps queuing invalidate\n");
1548 queue_invalidate = 1;
1549 ci->i_rdcache_revoking = ci->i_rdcache_gen;
1551 dout("check_caps failed to invalidate pages\n");
1552 /* we failed to invalidate pages. check these
1553 caps again later. */
1555 __cap_set_timeouts(mdsc, ci);
1558 tried_invalidate = 1;
1563 for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
1564 cap = rb_entry(p, struct ceph_cap, ci_node);
1567 /* avoid looping forever */
1568 if (mds >= cap->mds ||
1569 ((flags & CHECK_CAPS_AUTHONLY) && cap != ci->i_auth_cap))
1572 /* NOTE: no side-effects allowed, until we take s_mutex */
1575 if (ci->i_auth_cap && cap != ci->i_auth_cap)
1576 cap_used &= ~ci->i_auth_cap->issued;
1578 revoking = cap->implemented & ~cap->issued;
1579 dout(" mds%d cap %p used %s issued %s implemented %s revoking %s\n",
1580 cap->mds, cap, ceph_cap_string(cap->issued),
1581 ceph_cap_string(cap_used),
1582 ceph_cap_string(cap->implemented),
1583 ceph_cap_string(revoking));
1585 if (cap == ci->i_auth_cap &&
1586 (cap->issued & CEPH_CAP_FILE_WR)) {
1587 /* request larger max_size from MDS? */
1588 if (ci->i_wanted_max_size > ci->i_max_size &&
1589 ci->i_wanted_max_size > ci->i_requested_max_size) {
1590 dout("requesting new max_size\n");
1594 /* approaching file_max? */
1595 if ((inode->i_size << 1) >= ci->i_max_size &&
1596 (ci->i_reported_size << 1) < ci->i_max_size) {
1597 dout("i_size approaching max_size\n");
1601 /* flush anything dirty? */
1602 if (cap == ci->i_auth_cap && (flags & CHECK_CAPS_FLUSH) &&
1604 dout("flushing dirty caps\n");
1608 /* completed revocation? going down and there are no caps? */
1609 if (revoking && (revoking & cap_used) == 0) {
1610 dout("completed revocation of %s\n",
1611 ceph_cap_string(cap->implemented & ~cap->issued));
1615 /* want more caps from mds? */
1616 if (want & ~(cap->mds_wanted | cap->issued))
1619 /* things we might delay */
1620 if ((cap->issued & ~retain) == 0 &&
1621 cap->mds_wanted == want)
1622 continue; /* nope, all good */
1628 if ((ci->i_ceph_flags & CEPH_I_NODELAY) == 0 &&
1629 time_before(jiffies, ci->i_hold_caps_max)) {
1630 dout(" delaying issued %s -> %s, wanted %s -> %s\n",
1631 ceph_cap_string(cap->issued),
1632 ceph_cap_string(cap->issued & retain),
1633 ceph_cap_string(cap->mds_wanted),
1634 ceph_cap_string(want));
1640 if (ci->i_ceph_flags & CEPH_I_NOFLUSH) {
1641 dout(" skipping %p I_NOFLUSH set\n", inode);
1645 if (session && session != cap->session) {
1646 dout("oops, wrong session %p mutex\n", session);
1647 mutex_unlock(&session->s_mutex);
1651 session = cap->session;
1652 if (mutex_trylock(&session->s_mutex) == 0) {
1653 dout("inverting session/ino locks on %p\n",
1655 spin_unlock(&ci->i_ceph_lock);
1656 if (took_snap_rwsem) {
1657 up_read(&mdsc->snap_rwsem);
1658 took_snap_rwsem = 0;
1660 mutex_lock(&session->s_mutex);
1664 /* take snap_rwsem after session mutex */
1665 if (!took_snap_rwsem) {
1666 if (down_read_trylock(&mdsc->snap_rwsem) == 0) {
1667 dout("inverting snap/in locks on %p\n",
1669 spin_unlock(&ci->i_ceph_lock);
1670 down_read(&mdsc->snap_rwsem);
1671 took_snap_rwsem = 1;
1674 took_snap_rwsem = 1;
1677 if (cap == ci->i_auth_cap && ci->i_dirty_caps)
1678 flushing = __mark_caps_flushing(inode, session);
1682 mds = cap->mds; /* remember mds, so we don't repeat */
1685 /* __send_cap drops i_ceph_lock */
1686 delayed += __send_cap(mdsc, cap, CEPH_CAP_OP_UPDATE, cap_used,
1687 want, retain, flushing, NULL);
1688 goto retry; /* retake i_ceph_lock and restart our cap scan. */
1692 * Reschedule delayed caps release if we delayed anything,
1695 if (delayed && is_delayed)
1696 force_requeue = 1; /* __send_cap delayed release; requeue */
1697 if (!delayed && !is_delayed)
1698 __cap_delay_cancel(mdsc, ci);
1699 else if (!is_delayed || force_requeue)
1700 __cap_delay_requeue(mdsc, ci);
1702 spin_unlock(&ci->i_ceph_lock);
1704 if (queue_invalidate)
1705 ceph_queue_invalidate(inode);
1708 mutex_unlock(&session->s_mutex);
1709 if (took_snap_rwsem)
1710 up_read(&mdsc->snap_rwsem);
1714 * Try to flush dirty caps back to the auth mds.
1716 static int try_flush_caps(struct inode *inode, struct ceph_mds_session *session,
1717 unsigned *flush_tid)
1719 struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
1720 struct ceph_inode_info *ci = ceph_inode(inode);
1721 int unlock_session = session ? 0 : 1;
1725 spin_lock(&ci->i_ceph_lock);
1726 if (ci->i_ceph_flags & CEPH_I_NOFLUSH) {
1727 dout("try_flush_caps skipping %p I_NOFLUSH set\n", inode);
1730 if (ci->i_dirty_caps && ci->i_auth_cap) {
1731 struct ceph_cap *cap = ci->i_auth_cap;
1732 int used = __ceph_caps_used(ci);
1733 int want = __ceph_caps_wanted(ci);
1737 spin_unlock(&ci->i_ceph_lock);
1738 session = cap->session;
1739 mutex_lock(&session->s_mutex);
1742 BUG_ON(session != cap->session);
1743 if (cap->session->s_state < CEPH_MDS_SESSION_OPEN)
1746 flushing = __mark_caps_flushing(inode, session);
1748 /* __send_cap drops i_ceph_lock */
1749 delayed = __send_cap(mdsc, cap, CEPH_CAP_OP_FLUSH, used, want,
1750 cap->issued | cap->implemented, flushing,
1755 spin_lock(&ci->i_ceph_lock);
1756 __cap_delay_requeue(mdsc, ci);
1759 spin_unlock(&ci->i_ceph_lock);
1761 if (session && unlock_session)
1762 mutex_unlock(&session->s_mutex);
1767 * Return true if we've flushed caps through the given flush_tid.
1769 static int caps_are_flushed(struct inode *inode, unsigned tid)
1771 struct ceph_inode_info *ci = ceph_inode(inode);
1774 spin_lock(&ci->i_ceph_lock);
1775 for (i = 0; i < CEPH_CAP_BITS; i++)
1776 if ((ci->i_flushing_caps & (1 << i)) &&
1777 ci->i_cap_flush_tid[i] <= tid) {
1778 /* still flushing this bit */
1782 spin_unlock(&ci->i_ceph_lock);
1787 * Wait on any unsafe replies for the given inode. First wait on the
1788 * newest request, and make that the upper bound. Then, if there are
1789 * more requests, keep waiting on the oldest as long as it is still older
1790 * than the original request.
1792 static void sync_write_wait(struct inode *inode)
1794 struct ceph_inode_info *ci = ceph_inode(inode);
1795 struct list_head *head = &ci->i_unsafe_writes;
1796 struct ceph_osd_request *req;
1799 spin_lock(&ci->i_unsafe_lock);
1800 if (list_empty(head))
1803 /* set upper bound as _last_ entry in chain */
1804 req = list_entry(head->prev, struct ceph_osd_request,
1806 last_tid = req->r_tid;
1809 ceph_osdc_get_request(req);
1810 spin_unlock(&ci->i_unsafe_lock);
1811 dout("sync_write_wait on tid %llu (until %llu)\n",
1812 req->r_tid, last_tid);
1813 wait_for_completion(&req->r_safe_completion);
1814 spin_lock(&ci->i_unsafe_lock);
1815 ceph_osdc_put_request(req);
1818 * from here on look at first entry in chain, since we
1819 * only want to wait for anything older than last_tid
1821 if (list_empty(head))
1823 req = list_entry(head->next, struct ceph_osd_request,
1825 } while (req->r_tid < last_tid);
1827 spin_unlock(&ci->i_unsafe_lock);
1830 int ceph_fsync(struct file *file, loff_t start, loff_t end, int datasync)
1832 struct inode *inode = file->f_mapping->host;
1833 struct ceph_inode_info *ci = ceph_inode(inode);
1838 dout("fsync %p%s\n", inode, datasync ? " datasync" : "");
1839 sync_write_wait(inode);
1841 ret = filemap_write_and_wait_range(inode->i_mapping, start, end);
1844 mutex_lock(&inode->i_mutex);
1846 dirty = try_flush_caps(inode, NULL, &flush_tid);
1847 dout("fsync dirty caps are %s\n", ceph_cap_string(dirty));
1850 * only wait on non-file metadata writeback (the mds
1851 * can recover size and mtime, so we don't need to
1854 if (!datasync && (dirty & ~CEPH_CAP_ANY_FILE_WR)) {
1855 dout("fsync waiting for flush_tid %u\n", flush_tid);
1856 ret = wait_event_interruptible(ci->i_cap_wq,
1857 caps_are_flushed(inode, flush_tid));
1860 dout("fsync %p%s done\n", inode, datasync ? " datasync" : "");
1861 mutex_unlock(&inode->i_mutex);
1866 * Flush any dirty caps back to the mds. If we aren't asked to wait,
1867 * queue inode for flush but don't do so immediately, because we can
1868 * get by with fewer MDS messages if we wait for data writeback to
1871 int ceph_write_inode(struct inode *inode, struct writeback_control *wbc)
1873 struct ceph_inode_info *ci = ceph_inode(inode);
1877 int wait = wbc->sync_mode == WB_SYNC_ALL;
1879 dout("write_inode %p wait=%d\n", inode, wait);
1881 dirty = try_flush_caps(inode, NULL, &flush_tid);
1883 err = wait_event_interruptible(ci->i_cap_wq,
1884 caps_are_flushed(inode, flush_tid));
1886 struct ceph_mds_client *mdsc =
1887 ceph_sb_to_client(inode->i_sb)->mdsc;
1889 spin_lock(&ci->i_ceph_lock);
1890 if (__ceph_caps_dirty(ci))
1891 __cap_delay_requeue_front(mdsc, ci);
1892 spin_unlock(&ci->i_ceph_lock);
1898 * After a recovering MDS goes active, we need to resend any caps
1901 * Caller holds session->s_mutex.
1903 static void kick_flushing_capsnaps(struct ceph_mds_client *mdsc,
1904 struct ceph_mds_session *session)
1906 struct ceph_cap_snap *capsnap;
1908 dout("kick_flushing_capsnaps mds%d\n", session->s_mds);
1909 list_for_each_entry(capsnap, &session->s_cap_snaps_flushing,
1911 struct ceph_inode_info *ci = capsnap->ci;
1912 struct inode *inode = &ci->vfs_inode;
1913 struct ceph_cap *cap;
1915 spin_lock(&ci->i_ceph_lock);
1916 cap = ci->i_auth_cap;
1917 if (cap && cap->session == session) {
1918 dout("kick_flushing_caps %p cap %p capsnap %p\n", inode,
1920 __ceph_flush_snaps(ci, &session, 1);
1922 pr_err("%p auth cap %p not mds%d ???\n", inode,
1923 cap, session->s_mds);
1925 spin_unlock(&ci->i_ceph_lock);
1929 void ceph_kick_flushing_caps(struct ceph_mds_client *mdsc,
1930 struct ceph_mds_session *session)
1932 struct ceph_inode_info *ci;
1934 kick_flushing_capsnaps(mdsc, session);
1936 dout("kick_flushing_caps mds%d\n", session->s_mds);
1937 list_for_each_entry(ci, &session->s_cap_flushing, i_flushing_item) {
1938 struct inode *inode = &ci->vfs_inode;
1939 struct ceph_cap *cap;
1942 spin_lock(&ci->i_ceph_lock);
1943 cap = ci->i_auth_cap;
1944 if (cap && cap->session == session) {
1945 dout("kick_flushing_caps %p cap %p %s\n", inode,
1946 cap, ceph_cap_string(ci->i_flushing_caps));
1947 delayed = __send_cap(mdsc, cap, CEPH_CAP_OP_FLUSH,
1948 __ceph_caps_used(ci),
1949 __ceph_caps_wanted(ci),
1950 cap->issued | cap->implemented,
1951 ci->i_flushing_caps, NULL);
1953 spin_lock(&ci->i_ceph_lock);
1954 __cap_delay_requeue(mdsc, ci);
1955 spin_unlock(&ci->i_ceph_lock);
1958 pr_err("%p auth cap %p not mds%d ???\n", inode,
1959 cap, session->s_mds);
1960 spin_unlock(&ci->i_ceph_lock);
1965 static void kick_flushing_inode_caps(struct ceph_mds_client *mdsc,
1966 struct ceph_mds_session *session,
1967 struct inode *inode)
1969 struct ceph_inode_info *ci = ceph_inode(inode);
1970 struct ceph_cap *cap;
1973 spin_lock(&ci->i_ceph_lock);
1974 cap = ci->i_auth_cap;
1975 dout("kick_flushing_inode_caps %p flushing %s flush_seq %lld\n", inode,
1976 ceph_cap_string(ci->i_flushing_caps), ci->i_cap_flush_seq);
1977 __ceph_flush_snaps(ci, &session, 1);
1978 if (ci->i_flushing_caps) {
1979 delayed = __send_cap(mdsc, cap, CEPH_CAP_OP_FLUSH,
1980 __ceph_caps_used(ci),
1981 __ceph_caps_wanted(ci),
1982 cap->issued | cap->implemented,
1983 ci->i_flushing_caps, NULL);
1985 spin_lock(&ci->i_ceph_lock);
1986 __cap_delay_requeue(mdsc, ci);
1987 spin_unlock(&ci->i_ceph_lock);
1990 spin_unlock(&ci->i_ceph_lock);
1996 * Take references to capabilities we hold, so that we don't release
1997 * them to the MDS prematurely.
1999 * Protected by i_ceph_lock.
2001 static void __take_cap_refs(struct ceph_inode_info *ci, int got)
2003 if (got & CEPH_CAP_PIN)
2005 if (got & CEPH_CAP_FILE_RD)
2007 if (got & CEPH_CAP_FILE_CACHE)
2008 ci->i_rdcache_ref++;
2009 if (got & CEPH_CAP_FILE_WR)
2011 if (got & CEPH_CAP_FILE_BUFFER) {
2012 if (ci->i_wb_ref == 0)
2013 ihold(&ci->vfs_inode);
2015 dout("__take_cap_refs %p wb %d -> %d (?)\n",
2016 &ci->vfs_inode, ci->i_wb_ref-1, ci->i_wb_ref);
2021 * Try to grab cap references. Specify those refs we @want, and the
2022 * minimal set we @need. Also include the larger offset we are writing
2023 * to (when applicable), and check against max_size here as well.
2024 * Note that caller is responsible for ensuring max_size increases are
2025 * requested from the MDS.
2027 static int try_get_cap_refs(struct ceph_inode_info *ci, int need, int want,
2028 int *got, loff_t endoff, int *check_max, int *err)
2030 struct inode *inode = &ci->vfs_inode;
2032 int have, implemented;
2035 dout("get_cap_refs %p need %s want %s\n", inode,
2036 ceph_cap_string(need), ceph_cap_string(want));
2037 spin_lock(&ci->i_ceph_lock);
2039 /* make sure file is actually open */
2040 file_wanted = __ceph_caps_file_wanted(ci);
2041 if ((file_wanted & need) == 0) {
2042 dout("try_get_cap_refs need %s file_wanted %s, EBADF\n",
2043 ceph_cap_string(need), ceph_cap_string(file_wanted));
2049 if (need & CEPH_CAP_FILE_WR) {
2050 if (endoff >= 0 && endoff > (loff_t)ci->i_max_size) {
2051 dout("get_cap_refs %p endoff %llu > maxsize %llu\n",
2052 inode, endoff, ci->i_max_size);
2053 if (endoff > ci->i_wanted_max_size) {
2060 * If a sync write is in progress, we must wait, so that we
2061 * can get a final snapshot value for size+mtime.
2063 if (__ceph_have_pending_cap_snap(ci)) {
2064 dout("get_cap_refs %p cap_snap_pending\n", inode);
2068 have = __ceph_caps_issued(ci, &implemented);
2071 * disallow writes while a truncate is pending
2073 if (ci->i_truncate_pending)
2074 have &= ~CEPH_CAP_FILE_WR;
2076 if ((have & need) == need) {
2078 * Look at (implemented & ~have & not) so that we keep waiting
2079 * on transition from wanted -> needed caps. This is needed
2080 * for WRBUFFER|WR -> WR to avoid a new WR sync write from
2081 * going before a prior buffered writeback happens.
2083 int not = want & ~(have & need);
2084 int revoking = implemented & ~have;
2085 dout("get_cap_refs %p have %s but not %s (revoking %s)\n",
2086 inode, ceph_cap_string(have), ceph_cap_string(not),
2087 ceph_cap_string(revoking));
2088 if ((revoking & not) == 0) {
2089 *got = need | (have & want);
2090 __take_cap_refs(ci, *got);
2094 dout("get_cap_refs %p have %s needed %s\n", inode,
2095 ceph_cap_string(have), ceph_cap_string(need));
2098 spin_unlock(&ci->i_ceph_lock);
2099 dout("get_cap_refs %p ret %d got %s\n", inode,
2100 ret, ceph_cap_string(*got));
2105 * Check the offset we are writing up to against our current
2106 * max_size. If necessary, tell the MDS we want to write to
2109 static void check_max_size(struct inode *inode, loff_t endoff)
2111 struct ceph_inode_info *ci = ceph_inode(inode);
2114 /* do we need to explicitly request a larger max_size? */
2115 spin_lock(&ci->i_ceph_lock);
2116 if ((endoff >= ci->i_max_size ||
2117 endoff > (inode->i_size << 1)) &&
2118 endoff > ci->i_wanted_max_size) {
2119 dout("write %p at large endoff %llu, req max_size\n",
2121 ci->i_wanted_max_size = endoff;
2124 spin_unlock(&ci->i_ceph_lock);
2126 ceph_check_caps(ci, CHECK_CAPS_AUTHONLY, NULL);
2130 * Wait for caps, and take cap references. If we can't get a WR cap
2131 * due to a small max_size, make sure we check_max_size (and possibly
2132 * ask the mds) so we don't get hung up indefinitely.
2134 int ceph_get_caps(struct ceph_inode_info *ci, int need, int want, int *got,
2137 int check_max, ret, err;
2141 check_max_size(&ci->vfs_inode, endoff);
2144 ret = wait_event_interruptible(ci->i_cap_wq,
2145 try_get_cap_refs(ci, need, want,
2156 * Take cap refs. Caller must already know we hold at least one ref
2157 * on the caps in question or we don't know this is safe.
2159 void ceph_get_cap_refs(struct ceph_inode_info *ci, int caps)
2161 spin_lock(&ci->i_ceph_lock);
2162 __take_cap_refs(ci, caps);
2163 spin_unlock(&ci->i_ceph_lock);
2169 * If we released the last ref on any given cap, call ceph_check_caps
2170 * to release (or schedule a release).
2172 * If we are releasing a WR cap (from a sync write), finalize any affected
2173 * cap_snap, and wake up any waiters.
2175 void ceph_put_cap_refs(struct ceph_inode_info *ci, int had)
2177 struct inode *inode = &ci->vfs_inode;
2178 int last = 0, put = 0, flushsnaps = 0, wake = 0;
2179 struct ceph_cap_snap *capsnap;
2181 spin_lock(&ci->i_ceph_lock);
2182 if (had & CEPH_CAP_PIN)
2184 if (had & CEPH_CAP_FILE_RD)
2185 if (--ci->i_rd_ref == 0)
2187 if (had & CEPH_CAP_FILE_CACHE)
2188 if (--ci->i_rdcache_ref == 0)
2190 if (had & CEPH_CAP_FILE_BUFFER) {
2191 if (--ci->i_wb_ref == 0) {
2195 dout("put_cap_refs %p wb %d -> %d (?)\n",
2196 inode, ci->i_wb_ref+1, ci->i_wb_ref);
2198 if (had & CEPH_CAP_FILE_WR)
2199 if (--ci->i_wr_ref == 0) {
2201 if (!list_empty(&ci->i_cap_snaps)) {
2202 capsnap = list_first_entry(&ci->i_cap_snaps,
2203 struct ceph_cap_snap,
2205 if (capsnap->writing) {
2206 capsnap->writing = 0;
2208 __ceph_finish_cap_snap(ci,
2214 spin_unlock(&ci->i_ceph_lock);
2216 dout("put_cap_refs %p had %s%s%s\n", inode, ceph_cap_string(had),
2217 last ? " last" : "", put ? " put" : "");
2219 if (last && !flushsnaps)
2220 ceph_check_caps(ci, 0, NULL);
2221 else if (flushsnaps)
2222 ceph_flush_snaps(ci);
2224 wake_up_all(&ci->i_cap_wq);
2230 * Release @nr WRBUFFER refs on dirty pages for the given @snapc snap
2231 * context. Adjust per-snap dirty page accounting as appropriate.
2232 * Once all dirty data for a cap_snap is flushed, flush snapped file
2233 * metadata back to the MDS. If we dropped the last ref, call
2236 void ceph_put_wrbuffer_cap_refs(struct ceph_inode_info *ci, int nr,
2237 struct ceph_snap_context *snapc)
2239 struct inode *inode = &ci->vfs_inode;
2241 int complete_capsnap = 0;
2242 int drop_capsnap = 0;
2244 struct ceph_cap_snap *capsnap = NULL;
2246 spin_lock(&ci->i_ceph_lock);
2247 ci->i_wrbuffer_ref -= nr;
2248 last = !ci->i_wrbuffer_ref;
2250 if (ci->i_head_snapc == snapc) {
2251 ci->i_wrbuffer_ref_head -= nr;
2252 if (ci->i_wrbuffer_ref_head == 0 &&
2253 ci->i_dirty_caps == 0 && ci->i_flushing_caps == 0) {
2254 BUG_ON(!ci->i_head_snapc);
2255 ceph_put_snap_context(ci->i_head_snapc);
2256 ci->i_head_snapc = NULL;
2258 dout("put_wrbuffer_cap_refs on %p head %d/%d -> %d/%d %s\n",
2260 ci->i_wrbuffer_ref+nr, ci->i_wrbuffer_ref_head+nr,
2261 ci->i_wrbuffer_ref, ci->i_wrbuffer_ref_head,
2262 last ? " LAST" : "");
2264 list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) {
2265 if (capsnap->context == snapc) {
2271 capsnap->dirty_pages -= nr;
2272 if (capsnap->dirty_pages == 0) {
2273 complete_capsnap = 1;
2274 if (capsnap->dirty == 0)
2275 /* cap writeback completed before we created
2276 * the cap_snap; no FLUSHSNAP is needed */
2279 dout("put_wrbuffer_cap_refs on %p cap_snap %p "
2280 " snap %lld %d/%d -> %d/%d %s%s%s\n",
2281 inode, capsnap, capsnap->context->seq,
2282 ci->i_wrbuffer_ref+nr, capsnap->dirty_pages + nr,
2283 ci->i_wrbuffer_ref, capsnap->dirty_pages,
2284 last ? " (wrbuffer last)" : "",
2285 complete_capsnap ? " (complete capsnap)" : "",
2286 drop_capsnap ? " (drop capsnap)" : "");
2288 ceph_put_snap_context(capsnap->context);
2289 list_del(&capsnap->ci_item);
2290 list_del(&capsnap->flushing_item);
2291 ceph_put_cap_snap(capsnap);
2295 spin_unlock(&ci->i_ceph_lock);
2298 ceph_check_caps(ci, CHECK_CAPS_AUTHONLY, NULL);
2300 } else if (complete_capsnap) {
2301 ceph_flush_snaps(ci);
2302 wake_up_all(&ci->i_cap_wq);
2309 * Handle a cap GRANT message from the MDS. (Note that a GRANT may
2310 * actually be a revocation if it specifies a smaller cap set.)
2312 * caller holds s_mutex and i_ceph_lock, we drop both.
2316 * 1 - check_caps on auth cap only (writeback)
2317 * 2 - check_caps (ack revoke)
2319 static void handle_cap_grant(struct inode *inode, struct ceph_mds_caps *grant,
2320 struct ceph_mds_session *session,
2321 struct ceph_cap *cap,
2322 struct ceph_buffer *xattr_buf)
2323 __releases(ci->i_ceph_lock)
2325 struct ceph_inode_info *ci = ceph_inode(inode);
2326 int mds = session->s_mds;
2327 int seq = le32_to_cpu(grant->seq);
2328 int newcaps = le32_to_cpu(grant->caps);
2329 int issued, implemented, used, wanted, dirty;
2330 u64 size = le64_to_cpu(grant->size);
2331 u64 max_size = le64_to_cpu(grant->max_size);
2332 struct timespec mtime, atime, ctime;
2336 int revoked_rdcache = 0;
2337 int queue_invalidate = 0;
2339 dout("handle_cap_grant inode %p cap %p mds%d seq %d %s\n",
2340 inode, cap, mds, seq, ceph_cap_string(newcaps));
2341 dout(" size %llu max_size %llu, i_size %llu\n", size, max_size,
2345 * If CACHE is being revoked, and we have no dirty buffers,
2346 * try to invalidate (once). (If there are dirty buffers, we
2347 * will invalidate _after_ writeback.)
2349 if (((cap->issued & ~newcaps) & CEPH_CAP_FILE_CACHE) &&
2350 (newcaps & CEPH_CAP_FILE_LAZYIO) == 0 &&
2351 !ci->i_wrbuffer_ref) {
2352 if (try_nonblocking_invalidate(inode) == 0) {
2353 revoked_rdcache = 1;
2355 /* there were locked pages.. invalidate later
2356 in a separate thread. */
2357 if (ci->i_rdcache_revoking != ci->i_rdcache_gen) {
2358 queue_invalidate = 1;
2359 ci->i_rdcache_revoking = ci->i_rdcache_gen;
2364 /* side effects now are allowed */
2366 issued = __ceph_caps_issued(ci, &implemented);
2367 issued |= implemented | __ceph_caps_dirty(ci);
2369 cap->cap_gen = session->s_cap_gen;
2371 __check_cap_issue(ci, cap, newcaps);
2373 if ((issued & CEPH_CAP_AUTH_EXCL) == 0) {
2374 inode->i_mode = le32_to_cpu(grant->mode);
2375 inode->i_uid = make_kuid(&init_user_ns, le32_to_cpu(grant->uid));
2376 inode->i_gid = make_kgid(&init_user_ns, le32_to_cpu(grant->gid));
2377 dout("%p mode 0%o uid.gid %d.%d\n", inode, inode->i_mode,
2378 from_kuid(&init_user_ns, inode->i_uid),
2379 from_kgid(&init_user_ns, inode->i_gid));
2382 if ((issued & CEPH_CAP_LINK_EXCL) == 0)
2383 set_nlink(inode, le32_to_cpu(grant->nlink));
2385 if ((issued & CEPH_CAP_XATTR_EXCL) == 0 && grant->xattr_len) {
2386 int len = le32_to_cpu(grant->xattr_len);
2387 u64 version = le64_to_cpu(grant->xattr_version);
2389 if (version > ci->i_xattrs.version) {
2390 dout(" got new xattrs v%llu on %p len %d\n",
2391 version, inode, len);
2392 if (ci->i_xattrs.blob)
2393 ceph_buffer_put(ci->i_xattrs.blob);
2394 ci->i_xattrs.blob = ceph_buffer_get(xattr_buf);
2395 ci->i_xattrs.version = version;
2399 /* size/ctime/mtime/atime? */
2400 ceph_fill_file_size(inode, issued,
2401 le32_to_cpu(grant->truncate_seq),
2402 le64_to_cpu(grant->truncate_size), size);
2403 ceph_decode_timespec(&mtime, &grant->mtime);
2404 ceph_decode_timespec(&atime, &grant->atime);
2405 ceph_decode_timespec(&ctime, &grant->ctime);
2406 ceph_fill_file_time(inode, issued,
2407 le32_to_cpu(grant->time_warp_seq), &ctime, &mtime,
2410 /* max size increase? */
2411 if (ci->i_auth_cap == cap && max_size != ci->i_max_size) {
2412 dout("max_size %lld -> %llu\n", ci->i_max_size, max_size);
2413 ci->i_max_size = max_size;
2414 if (max_size >= ci->i_wanted_max_size) {
2415 ci->i_wanted_max_size = 0; /* reset */
2416 ci->i_requested_max_size = 0;
2421 /* check cap bits */
2422 wanted = __ceph_caps_wanted(ci);
2423 used = __ceph_caps_used(ci);
2424 dirty = __ceph_caps_dirty(ci);
2425 dout(" my wanted = %s, used = %s, dirty %s\n",
2426 ceph_cap_string(wanted),
2427 ceph_cap_string(used),
2428 ceph_cap_string(dirty));
2429 if (wanted != le32_to_cpu(grant->wanted)) {
2430 dout("mds wanted %s -> %s\n",
2431 ceph_cap_string(le32_to_cpu(grant->wanted)),
2432 ceph_cap_string(wanted));
2433 /* imported cap may not have correct mds_wanted */
2434 if (le32_to_cpu(grant->op) == CEPH_CAP_OP_IMPORT)
2440 /* file layout may have changed */
2441 ci->i_layout = grant->layout;
2443 /* revocation, grant, or no-op? */
2444 if (cap->issued & ~newcaps) {
2445 int revoking = cap->issued & ~newcaps;
2447 dout("revocation: %s -> %s (revoking %s)\n",
2448 ceph_cap_string(cap->issued),
2449 ceph_cap_string(newcaps),
2450 ceph_cap_string(revoking));
2451 if (revoking & used & CEPH_CAP_FILE_BUFFER)
2452 writeback = 1; /* initiate writeback; will delay ack */
2453 else if (revoking == CEPH_CAP_FILE_CACHE &&
2454 (newcaps & CEPH_CAP_FILE_LAZYIO) == 0 &&
2456 ; /* do nothing yet, invalidation will be queued */
2457 else if (cap == ci->i_auth_cap)
2458 check_caps = 1; /* check auth cap only */
2460 check_caps = 2; /* check all caps */
2461 cap->issued = newcaps;
2462 cap->implemented |= newcaps;
2463 } else if (cap->issued == newcaps) {
2464 dout("caps unchanged: %s -> %s\n",
2465 ceph_cap_string(cap->issued), ceph_cap_string(newcaps));
2467 dout("grant: %s -> %s\n", ceph_cap_string(cap->issued),
2468 ceph_cap_string(newcaps));
2469 cap->issued = newcaps;
2470 cap->implemented |= newcaps; /* add bits only, to
2471 * avoid stepping on a
2472 * pending revocation */
2475 BUG_ON(cap->issued & ~cap->implemented);
2477 spin_unlock(&ci->i_ceph_lock);
2480 * queue inode for writeback: we can't actually call
2481 * filemap_write_and_wait, etc. from message handler
2484 ceph_queue_writeback(inode);
2485 if (queue_invalidate)
2486 ceph_queue_invalidate(inode);
2488 wake_up_all(&ci->i_cap_wq);
2490 if (check_caps == 1)
2491 ceph_check_caps(ci, CHECK_CAPS_NODELAY|CHECK_CAPS_AUTHONLY,
2493 else if (check_caps == 2)
2494 ceph_check_caps(ci, CHECK_CAPS_NODELAY, session);
2496 mutex_unlock(&session->s_mutex);
2500 * Handle FLUSH_ACK from MDS, indicating that metadata we sent to the
2501 * MDS has been safely committed.
2503 static void handle_cap_flush_ack(struct inode *inode, u64 flush_tid,
2504 struct ceph_mds_caps *m,
2505 struct ceph_mds_session *session,
2506 struct ceph_cap *cap)
2507 __releases(ci->i_ceph_lock)
2509 struct ceph_inode_info *ci = ceph_inode(inode);
2510 struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
2511 unsigned seq = le32_to_cpu(m->seq);
2512 int dirty = le32_to_cpu(m->dirty);
2517 for (i = 0; i < CEPH_CAP_BITS; i++)
2518 if ((dirty & (1 << i)) &&
2519 flush_tid == ci->i_cap_flush_tid[i])
2522 dout("handle_cap_flush_ack inode %p mds%d seq %d on %s cleaned %s,"
2523 " flushing %s -> %s\n",
2524 inode, session->s_mds, seq, ceph_cap_string(dirty),
2525 ceph_cap_string(cleaned), ceph_cap_string(ci->i_flushing_caps),
2526 ceph_cap_string(ci->i_flushing_caps & ~cleaned));
2528 if (ci->i_flushing_caps == (ci->i_flushing_caps & ~cleaned))
2531 ci->i_flushing_caps &= ~cleaned;
2533 spin_lock(&mdsc->cap_dirty_lock);
2534 if (ci->i_flushing_caps == 0) {
2535 list_del_init(&ci->i_flushing_item);
2536 if (!list_empty(&session->s_cap_flushing))
2537 dout(" mds%d still flushing cap on %p\n",
2539 &list_entry(session->s_cap_flushing.next,
2540 struct ceph_inode_info,
2541 i_flushing_item)->vfs_inode);
2542 mdsc->num_cap_flushing--;
2543 wake_up_all(&mdsc->cap_flushing_wq);
2544 dout(" inode %p now !flushing\n", inode);
2546 if (ci->i_dirty_caps == 0) {
2547 dout(" inode %p now clean\n", inode);
2548 BUG_ON(!list_empty(&ci->i_dirty_item));
2550 if (ci->i_wrbuffer_ref_head == 0) {
2551 BUG_ON(!ci->i_head_snapc);
2552 ceph_put_snap_context(ci->i_head_snapc);
2553 ci->i_head_snapc = NULL;
2556 BUG_ON(list_empty(&ci->i_dirty_item));
2559 spin_unlock(&mdsc->cap_dirty_lock);
2560 wake_up_all(&ci->i_cap_wq);
2563 spin_unlock(&ci->i_ceph_lock);
2569 * Handle FLUSHSNAP_ACK. MDS has flushed snap data to disk and we can
2570 * throw away our cap_snap.
2572 * Caller hold s_mutex.
2574 static void handle_cap_flushsnap_ack(struct inode *inode, u64 flush_tid,
2575 struct ceph_mds_caps *m,
2576 struct ceph_mds_session *session)
2578 struct ceph_inode_info *ci = ceph_inode(inode);
2579 u64 follows = le64_to_cpu(m->snap_follows);
2580 struct ceph_cap_snap *capsnap;
2583 dout("handle_cap_flushsnap_ack inode %p ci %p mds%d follows %lld\n",
2584 inode, ci, session->s_mds, follows);
2586 spin_lock(&ci->i_ceph_lock);
2587 list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) {
2588 if (capsnap->follows == follows) {
2589 if (capsnap->flush_tid != flush_tid) {
2590 dout(" cap_snap %p follows %lld tid %lld !="
2591 " %lld\n", capsnap, follows,
2592 flush_tid, capsnap->flush_tid);
2595 WARN_ON(capsnap->dirty_pages || capsnap->writing);
2596 dout(" removing %p cap_snap %p follows %lld\n",
2597 inode, capsnap, follows);
2598 ceph_put_snap_context(capsnap->context);
2599 list_del(&capsnap->ci_item);
2600 list_del(&capsnap->flushing_item);
2601 ceph_put_cap_snap(capsnap);
2605 dout(" skipping cap_snap %p follows %lld\n",
2606 capsnap, capsnap->follows);
2609 spin_unlock(&ci->i_ceph_lock);
2615 * Handle TRUNC from MDS, indicating file truncation.
2617 * caller hold s_mutex.
2619 static void handle_cap_trunc(struct inode *inode,
2620 struct ceph_mds_caps *trunc,
2621 struct ceph_mds_session *session)
2622 __releases(ci->i_ceph_lock)
2624 struct ceph_inode_info *ci = ceph_inode(inode);
2625 int mds = session->s_mds;
2626 int seq = le32_to_cpu(trunc->seq);
2627 u32 truncate_seq = le32_to_cpu(trunc->truncate_seq);
2628 u64 truncate_size = le64_to_cpu(trunc->truncate_size);
2629 u64 size = le64_to_cpu(trunc->size);
2630 int implemented = 0;
2631 int dirty = __ceph_caps_dirty(ci);
2632 int issued = __ceph_caps_issued(ceph_inode(inode), &implemented);
2633 int queue_trunc = 0;
2635 issued |= implemented | dirty;
2637 dout("handle_cap_trunc inode %p mds%d seq %d to %lld seq %d\n",
2638 inode, mds, seq, truncate_size, truncate_seq);
2639 queue_trunc = ceph_fill_file_size(inode, issued,
2640 truncate_seq, truncate_size, size);
2641 spin_unlock(&ci->i_ceph_lock);
2644 ceph_queue_vmtruncate(inode);
2648 * Handle EXPORT from MDS. Cap is being migrated _from_ this mds to a
2649 * different one. If we are the most recent migration we've seen (as
2650 * indicated by mseq), make note of the migrating cap bits for the
2651 * duration (until we see the corresponding IMPORT).
2653 * caller holds s_mutex
2655 static void handle_cap_export(struct inode *inode, struct ceph_mds_caps *ex,
2656 struct ceph_mds_session *session,
2657 int *open_target_sessions)
2659 struct ceph_mds_client *mdsc = ceph_inode_to_client(inode)->mdsc;
2660 struct ceph_inode_info *ci = ceph_inode(inode);
2661 int mds = session->s_mds;
2662 unsigned mseq = le32_to_cpu(ex->migrate_seq);
2663 struct ceph_cap *cap = NULL, *t;
2667 dout("handle_cap_export inode %p ci %p mds%d mseq %d\n",
2668 inode, ci, mds, mseq);
2670 spin_lock(&ci->i_ceph_lock);
2672 /* make sure we haven't seen a higher mseq */
2673 for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
2674 t = rb_entry(p, struct ceph_cap, ci_node);
2675 if (ceph_seq_cmp(t->mseq, mseq) > 0) {
2676 dout(" higher mseq on cap from mds%d\n",
2680 if (t->session->s_mds == mds)
2687 ci->i_cap_exporting_mds = mds;
2688 ci->i_cap_exporting_mseq = mseq;
2689 ci->i_cap_exporting_issued = cap->issued;
2692 * make sure we have open sessions with all possible
2693 * export targets, so that we get the matching IMPORT
2695 *open_target_sessions = 1;
2698 * we can't flush dirty caps that we've seen the
2699 * EXPORT but no IMPORT for
2701 spin_lock(&mdsc->cap_dirty_lock);
2702 if (!list_empty(&ci->i_dirty_item)) {
2703 dout(" moving %p to cap_dirty_migrating\n",
2705 list_move(&ci->i_dirty_item,
2706 &mdsc->cap_dirty_migrating);
2708 spin_unlock(&mdsc->cap_dirty_lock);
2710 __ceph_remove_cap(cap);
2712 /* else, we already released it */
2714 spin_unlock(&ci->i_ceph_lock);
2718 * Handle cap IMPORT. If there are temp bits from an older EXPORT,
2721 * caller holds s_mutex.
2723 static void handle_cap_import(struct ceph_mds_client *mdsc,
2724 struct inode *inode, struct ceph_mds_caps *im,
2725 struct ceph_mds_session *session,
2726 void *snaptrace, int snaptrace_len)
2728 struct ceph_inode_info *ci = ceph_inode(inode);
2729 int mds = session->s_mds;
2730 unsigned issued = le32_to_cpu(im->caps);
2731 unsigned wanted = le32_to_cpu(im->wanted);
2732 unsigned seq = le32_to_cpu(im->seq);
2733 unsigned mseq = le32_to_cpu(im->migrate_seq);
2734 u64 realmino = le64_to_cpu(im->realm);
2735 u64 cap_id = le64_to_cpu(im->cap_id);
2737 if (ci->i_cap_exporting_mds >= 0 &&
2738 ceph_seq_cmp(ci->i_cap_exporting_mseq, mseq) < 0) {
2739 dout("handle_cap_import inode %p ci %p mds%d mseq %d"
2740 " - cleared exporting from mds%d\n",
2741 inode, ci, mds, mseq,
2742 ci->i_cap_exporting_mds);
2743 ci->i_cap_exporting_issued = 0;
2744 ci->i_cap_exporting_mseq = 0;
2745 ci->i_cap_exporting_mds = -1;
2747 spin_lock(&mdsc->cap_dirty_lock);
2748 if (!list_empty(&ci->i_dirty_item)) {
2749 dout(" moving %p back to cap_dirty\n", inode);
2750 list_move(&ci->i_dirty_item, &mdsc->cap_dirty);
2752 spin_unlock(&mdsc->cap_dirty_lock);
2754 dout("handle_cap_import inode %p ci %p mds%d mseq %d\n",
2755 inode, ci, mds, mseq);
2758 down_write(&mdsc->snap_rwsem);
2759 ceph_update_snap_trace(mdsc, snaptrace, snaptrace+snaptrace_len,
2761 downgrade_write(&mdsc->snap_rwsem);
2762 ceph_add_cap(inode, session, cap_id, -1,
2763 issued, wanted, seq, mseq, realmino, CEPH_CAP_FLAG_AUTH,
2764 NULL /* no caps context */);
2765 kick_flushing_inode_caps(mdsc, session, inode);
2766 up_read(&mdsc->snap_rwsem);
2768 /* make sure we re-request max_size, if necessary */
2769 spin_lock(&ci->i_ceph_lock);
2770 ci->i_wanted_max_size = 0; /* reset */
2771 ci->i_requested_max_size = 0;
2772 spin_unlock(&ci->i_ceph_lock);
2776 * Handle a caps message from the MDS.
2778 * Identify the appropriate session, inode, and call the right handler
2779 * based on the cap op.
2781 void ceph_handle_caps(struct ceph_mds_session *session,
2782 struct ceph_msg *msg)
2784 struct ceph_mds_client *mdsc = session->s_mdsc;
2785 struct super_block *sb = mdsc->fsc->sb;
2786 struct inode *inode;
2787 struct ceph_inode_info *ci;
2788 struct ceph_cap *cap;
2789 struct ceph_mds_caps *h;
2790 int mds = session->s_mds;
2793 struct ceph_vino vino;
2798 size_t snaptrace_len;
2801 int open_target_sessions = 0;
2803 dout("handle_caps from mds%d\n", mds);
2806 tid = le64_to_cpu(msg->hdr.tid);
2807 if (msg->front.iov_len < sizeof(*h))
2809 h = msg->front.iov_base;
2810 op = le32_to_cpu(h->op);
2811 vino.ino = le64_to_cpu(h->ino);
2812 vino.snap = CEPH_NOSNAP;
2813 cap_id = le64_to_cpu(h->cap_id);
2814 seq = le32_to_cpu(h->seq);
2815 mseq = le32_to_cpu(h->migrate_seq);
2816 size = le64_to_cpu(h->size);
2817 max_size = le64_to_cpu(h->max_size);
2820 snaptrace_len = le32_to_cpu(h->snap_trace_len);
2822 if (le16_to_cpu(msg->hdr.version) >= 2) {
2825 p = snaptrace + snaptrace_len;
2826 end = msg->front.iov_base + msg->front.iov_len;
2827 ceph_decode_32_safe(&p, end, flock_len, bad);
2834 mutex_lock(&session->s_mutex);
2836 dout(" mds%d seq %lld cap seq %u\n", session->s_mds, session->s_seq,
2839 if (op == CEPH_CAP_OP_IMPORT)
2840 ceph_add_cap_releases(mdsc, session);
2843 inode = ceph_find_inode(sb, vino);
2844 ci = ceph_inode(inode);
2845 dout(" op %s ino %llx.%llx inode %p\n", ceph_cap_op_name(op), vino.ino,
2848 dout(" i don't have ino %llx\n", vino.ino);
2850 if (op == CEPH_CAP_OP_IMPORT)
2851 __queue_cap_release(session, vino.ino, cap_id,
2853 goto flush_cap_releases;
2856 /* these will work even if we don't have a cap yet */
2858 case CEPH_CAP_OP_FLUSHSNAP_ACK:
2859 handle_cap_flushsnap_ack(inode, tid, h, session);
2862 case CEPH_CAP_OP_EXPORT:
2863 handle_cap_export(inode, h, session, &open_target_sessions);
2866 case CEPH_CAP_OP_IMPORT:
2867 handle_cap_import(mdsc, inode, h, session,
2868 snaptrace, snaptrace_len);
2871 /* the rest require a cap */
2872 spin_lock(&ci->i_ceph_lock);
2873 cap = __get_cap_for_mds(ceph_inode(inode), mds);
2875 dout(" no cap on %p ino %llx.%llx from mds%d\n",
2876 inode, ceph_ino(inode), ceph_snap(inode), mds);
2877 spin_unlock(&ci->i_ceph_lock);
2878 goto flush_cap_releases;
2881 /* note that each of these drops i_ceph_lock for us */
2883 case CEPH_CAP_OP_REVOKE:
2884 case CEPH_CAP_OP_GRANT:
2885 case CEPH_CAP_OP_IMPORT:
2886 handle_cap_grant(inode, h, session, cap, msg->middle);
2889 case CEPH_CAP_OP_FLUSH_ACK:
2890 handle_cap_flush_ack(inode, tid, h, session, cap);
2893 case CEPH_CAP_OP_TRUNC:
2894 handle_cap_trunc(inode, h, session);
2898 spin_unlock(&ci->i_ceph_lock);
2899 pr_err("ceph_handle_caps: unknown cap op %d %s\n", op,
2900 ceph_cap_op_name(op));
2907 * send any full release message to try to move things
2908 * along for the mds (who clearly thinks we still have this
2911 ceph_add_cap_releases(mdsc, session);
2912 ceph_send_cap_releases(mdsc, session);
2915 mutex_unlock(&session->s_mutex);
2919 if (open_target_sessions)
2920 ceph_mdsc_open_export_target_sessions(mdsc, session);
2924 pr_err("ceph_handle_caps: corrupt message\n");
2930 * Delayed work handler to process end of delayed cap release LRU list.
2932 void ceph_check_delayed_caps(struct ceph_mds_client *mdsc)
2934 struct ceph_inode_info *ci;
2935 int flags = CHECK_CAPS_NODELAY;
2937 dout("check_delayed_caps\n");
2939 spin_lock(&mdsc->cap_delay_lock);
2940 if (list_empty(&mdsc->cap_delay_list))
2942 ci = list_first_entry(&mdsc->cap_delay_list,
2943 struct ceph_inode_info,
2945 if ((ci->i_ceph_flags & CEPH_I_FLUSH) == 0 &&
2946 time_before(jiffies, ci->i_hold_caps_max))
2948 list_del_init(&ci->i_cap_delay_list);
2949 spin_unlock(&mdsc->cap_delay_lock);
2950 dout("check_delayed_caps on %p\n", &ci->vfs_inode);
2951 ceph_check_caps(ci, flags, NULL);
2953 spin_unlock(&mdsc->cap_delay_lock);
2957 * Flush all dirty caps to the mds
2959 void ceph_flush_dirty_caps(struct ceph_mds_client *mdsc)
2961 struct ceph_inode_info *ci;
2962 struct inode *inode;
2964 dout("flush_dirty_caps\n");
2965 spin_lock(&mdsc->cap_dirty_lock);
2966 while (!list_empty(&mdsc->cap_dirty)) {
2967 ci = list_first_entry(&mdsc->cap_dirty, struct ceph_inode_info,
2969 inode = &ci->vfs_inode;
2971 dout("flush_dirty_caps %p\n", inode);
2972 spin_unlock(&mdsc->cap_dirty_lock);
2973 ceph_check_caps(ci, CHECK_CAPS_NODELAY|CHECK_CAPS_FLUSH, NULL);
2975 spin_lock(&mdsc->cap_dirty_lock);
2977 spin_unlock(&mdsc->cap_dirty_lock);
2978 dout("flush_dirty_caps done\n");
2982 * Drop open file reference. If we were the last open file,
2983 * we may need to release capabilities to the MDS (or schedule
2984 * their delayed release).
2986 void ceph_put_fmode(struct ceph_inode_info *ci, int fmode)
2988 struct inode *inode = &ci->vfs_inode;
2991 spin_lock(&ci->i_ceph_lock);
2992 dout("put_fmode %p fmode %d %d -> %d\n", inode, fmode,
2993 ci->i_nr_by_mode[fmode], ci->i_nr_by_mode[fmode]-1);
2994 BUG_ON(ci->i_nr_by_mode[fmode] == 0);
2995 if (--ci->i_nr_by_mode[fmode] == 0)
2997 spin_unlock(&ci->i_ceph_lock);
2999 if (last && ci->i_vino.snap == CEPH_NOSNAP)
3000 ceph_check_caps(ci, 0, NULL);
3004 * Helpers for embedding cap and dentry lease releases into mds
3007 * @force is used by dentry_release (below) to force inclusion of a
3008 * record for the directory inode, even when there aren't any caps to
3011 int ceph_encode_inode_release(void **p, struct inode *inode,
3012 int mds, int drop, int unless, int force)
3014 struct ceph_inode_info *ci = ceph_inode(inode);
3015 struct ceph_cap *cap;
3016 struct ceph_mds_request_release *rel = *p;
3020 spin_lock(&ci->i_ceph_lock);
3021 used = __ceph_caps_used(ci);
3022 dirty = __ceph_caps_dirty(ci);
3024 dout("encode_inode_release %p mds%d used|dirty %s drop %s unless %s\n",
3025 inode, mds, ceph_cap_string(used|dirty), ceph_cap_string(drop),
3026 ceph_cap_string(unless));
3028 /* only drop unused, clean caps */
3029 drop &= ~(used | dirty);
3031 cap = __get_cap_for_mds(ci, mds);
3032 if (cap && __cap_is_valid(cap)) {
3034 ((cap->issued & drop) &&
3035 (cap->issued & unless) == 0)) {
3036 if ((cap->issued & drop) &&
3037 (cap->issued & unless) == 0) {
3038 dout("encode_inode_release %p cap %p %s -> "
3040 ceph_cap_string(cap->issued),
3041 ceph_cap_string(cap->issued & ~drop));
3042 cap->issued &= ~drop;
3043 cap->implemented &= ~drop;
3044 if (ci->i_ceph_flags & CEPH_I_NODELAY) {
3045 int wanted = __ceph_caps_wanted(ci);
3046 dout(" wanted %s -> %s (act %s)\n",
3047 ceph_cap_string(cap->mds_wanted),
3048 ceph_cap_string(cap->mds_wanted &
3050 ceph_cap_string(wanted));
3051 cap->mds_wanted &= wanted;
3054 dout("encode_inode_release %p cap %p %s"
3055 " (force)\n", inode, cap,
3056 ceph_cap_string(cap->issued));
3059 rel->ino = cpu_to_le64(ceph_ino(inode));
3060 rel->cap_id = cpu_to_le64(cap->cap_id);
3061 rel->seq = cpu_to_le32(cap->seq);
3062 rel->issue_seq = cpu_to_le32(cap->issue_seq),
3063 rel->mseq = cpu_to_le32(cap->mseq);
3064 rel->caps = cpu_to_le32(cap->issued);
3065 rel->wanted = cpu_to_le32(cap->mds_wanted);
3071 dout("encode_inode_release %p cap %p %s\n",
3072 inode, cap, ceph_cap_string(cap->issued));
3075 spin_unlock(&ci->i_ceph_lock);
3079 int ceph_encode_dentry_release(void **p, struct dentry *dentry,
3080 int mds, int drop, int unless)
3082 struct inode *dir = dentry->d_parent->d_inode;
3083 struct ceph_mds_request_release *rel = *p;
3084 struct ceph_dentry_info *di = ceph_dentry(dentry);
3089 * force an record for the directory caps if we have a dentry lease.
3090 * this is racy (can't take i_ceph_lock and d_lock together), but it
3091 * doesn't have to be perfect; the mds will revoke anything we don't
3094 spin_lock(&dentry->d_lock);
3095 if (di->lease_session && di->lease_session->s_mds == mds)
3097 spin_unlock(&dentry->d_lock);
3099 ret = ceph_encode_inode_release(p, dir, mds, drop, unless, force);
3101 spin_lock(&dentry->d_lock);
3102 if (ret && di->lease_session && di->lease_session->s_mds == mds) {
3103 dout("encode_dentry_release %p mds%d seq %d\n",
3104 dentry, mds, (int)di->lease_seq);
3105 rel->dname_len = cpu_to_le32(dentry->d_name.len);
3106 memcpy(*p, dentry->d_name.name, dentry->d_name.len);
3107 *p += dentry->d_name.len;
3108 rel->dname_seq = cpu_to_le32(di->lease_seq);
3109 __ceph_mdsc_drop_dentry_lease(dentry);
3111 spin_unlock(&dentry->d_lock);