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1// SPDX-License-Identifier: GPL-2.0
2#include <linux/ceph/ceph_debug.h>
3
4#include <linux/fs.h>
5#include <linux/kernel.h>
6#include <linux/sched/signal.h>
7#include <linux/slab.h>
8#include <linux/vmalloc.h>
9#include <linux/wait.h>
10#include <linux/writeback.h>
11
12#include "super.h"
13#include "mds_client.h"
14#include "cache.h"
15#include <linux/ceph/decode.h>
16#include <linux/ceph/messenger.h>
17
18/*
19 * Capability management
20 *
21 * The Ceph metadata servers control client access to inode metadata
22 * and file data by issuing capabilities, granting clients permission
23 * to read and/or write both inode field and file data to OSDs
24 * (storage nodes). Each capability consists of a set of bits
25 * indicating which operations are allowed.
26 *
27 * If the client holds a *_SHARED cap, the client has a coherent value
28 * that can be safely read from the cached inode.
29 *
30 * In the case of a *_EXCL (exclusive) or FILE_WR capabilities, the
31 * client is allowed to change inode attributes (e.g., file size,
32 * mtime), note its dirty state in the ceph_cap, and asynchronously
33 * flush that metadata change to the MDS.
34 *
35 * In the event of a conflicting operation (perhaps by another
36 * client), the MDS will revoke the conflicting client capabilities.
37 *
38 * In order for a client to cache an inode, it must hold a capability
39 * with at least one MDS server. When inodes are released, release
40 * notifications are batched and periodically sent en masse to the MDS
41 * cluster to release server state.
42 */
43
44static u64 __get_oldest_flush_tid(struct ceph_mds_client *mdsc);
45static void __kick_flushing_caps(struct ceph_mds_client *mdsc,
46 struct ceph_mds_session *session,
47 struct ceph_inode_info *ci,
48 u64 oldest_flush_tid);
49
50/*
51 * Generate readable cap strings for debugging output.
52 */
53#define MAX_CAP_STR 20
54static char cap_str[MAX_CAP_STR][40];
55static DEFINE_SPINLOCK(cap_str_lock);
56static int last_cap_str;
57
58static char *gcap_string(char *s, int c)
59{
60 if (c & CEPH_CAP_GSHARED)
61 *s++ = 's';
62 if (c & CEPH_CAP_GEXCL)
63 *s++ = 'x';
64 if (c & CEPH_CAP_GCACHE)
65 *s++ = 'c';
66 if (c & CEPH_CAP_GRD)
67 *s++ = 'r';
68 if (c & CEPH_CAP_GWR)
69 *s++ = 'w';
70 if (c & CEPH_CAP_GBUFFER)
71 *s++ = 'b';
72 if (c & CEPH_CAP_GLAZYIO)
73 *s++ = 'l';
74 return s;
75}
76
77const char *ceph_cap_string(int caps)
78{
79 int i;
80 char *s;
81 int c;
82
83 spin_lock(&cap_str_lock);
84 i = last_cap_str++;
85 if (last_cap_str == MAX_CAP_STR)
86 last_cap_str = 0;
87 spin_unlock(&cap_str_lock);
88
89 s = cap_str[i];
90
91 if (caps & CEPH_CAP_PIN)
92 *s++ = 'p';
93
94 c = (caps >> CEPH_CAP_SAUTH) & 3;
95 if (c) {
96 *s++ = 'A';
97 s = gcap_string(s, c);
98 }
99
100 c = (caps >> CEPH_CAP_SLINK) & 3;
101 if (c) {
102 *s++ = 'L';
103 s = gcap_string(s, c);
104 }
105
106 c = (caps >> CEPH_CAP_SXATTR) & 3;
107 if (c) {
108 *s++ = 'X';
109 s = gcap_string(s, c);
110 }
111
112 c = caps >> CEPH_CAP_SFILE;
113 if (c) {
114 *s++ = 'F';
115 s = gcap_string(s, c);
116 }
117
118 if (s == cap_str[i])
119 *s++ = '-';
120 *s = 0;
121 return cap_str[i];
122}
123
124void ceph_caps_init(struct ceph_mds_client *mdsc)
125{
126 INIT_LIST_HEAD(&mdsc->caps_list);
127 spin_lock_init(&mdsc->caps_list_lock);
128}
129
130void ceph_caps_finalize(struct ceph_mds_client *mdsc)
131{
132 struct ceph_cap *cap;
133
134 spin_lock(&mdsc->caps_list_lock);
135 while (!list_empty(&mdsc->caps_list)) {
136 cap = list_first_entry(&mdsc->caps_list,
137 struct ceph_cap, caps_item);
138 list_del(&cap->caps_item);
139 kmem_cache_free(ceph_cap_cachep, cap);
140 }
141 mdsc->caps_total_count = 0;
142 mdsc->caps_avail_count = 0;
143 mdsc->caps_use_count = 0;
144 mdsc->caps_reserve_count = 0;
145 mdsc->caps_min_count = 0;
146 spin_unlock(&mdsc->caps_list_lock);
147}
148
149void ceph_adjust_min_caps(struct ceph_mds_client *mdsc, int delta)
150{
151 spin_lock(&mdsc->caps_list_lock);
152 mdsc->caps_min_count += delta;
153 BUG_ON(mdsc->caps_min_count < 0);
154 spin_unlock(&mdsc->caps_list_lock);
155}
156
157/*
158 * Called under mdsc->mutex.
159 */
160int ceph_reserve_caps(struct ceph_mds_client *mdsc,
161 struct ceph_cap_reservation *ctx, int need)
162{
163 int i, j;
164 struct ceph_cap *cap;
165 int have;
166 int alloc = 0;
167 int max_caps;
168 bool trimmed = false;
169 struct ceph_mds_session *s;
170 LIST_HEAD(newcaps);
171
172 dout("reserve caps ctx=%p need=%d\n", ctx, need);
173
174 /* first reserve any caps that are already allocated */
175 spin_lock(&mdsc->caps_list_lock);
176 if (mdsc->caps_avail_count >= need)
177 have = need;
178 else
179 have = mdsc->caps_avail_count;
180 mdsc->caps_avail_count -= have;
181 mdsc->caps_reserve_count += have;
182 BUG_ON(mdsc->caps_total_count != mdsc->caps_use_count +
183 mdsc->caps_reserve_count +
184 mdsc->caps_avail_count);
185 spin_unlock(&mdsc->caps_list_lock);
186
187 for (i = have; i < need; ) {
188 cap = kmem_cache_alloc(ceph_cap_cachep, GFP_NOFS);
189 if (cap) {
190 list_add(&cap->caps_item, &newcaps);
191 alloc++;
192 i++;
193 continue;
194 }
195
196 if (!trimmed) {
197 for (j = 0; j < mdsc->max_sessions; j++) {
198 s = __ceph_lookup_mds_session(mdsc, j);
199 if (!s)
200 continue;
201 mutex_unlock(&mdsc->mutex);
202
203 mutex_lock(&s->s_mutex);
204 max_caps = s->s_nr_caps - (need - i);
205 ceph_trim_caps(mdsc, s, max_caps);
206 mutex_unlock(&s->s_mutex);
207
208 ceph_put_mds_session(s);
209 mutex_lock(&mdsc->mutex);
210 }
211 trimmed = true;
212
213 spin_lock(&mdsc->caps_list_lock);
214 if (mdsc->caps_avail_count) {
215 int more_have;
216 if (mdsc->caps_avail_count >= need - i)
217 more_have = need - i;
218 else
219 more_have = mdsc->caps_avail_count;
220
221 i += more_have;
222 have += more_have;
223 mdsc->caps_avail_count -= more_have;
224 mdsc->caps_reserve_count += more_have;
225
226 }
227 spin_unlock(&mdsc->caps_list_lock);
228
229 continue;
230 }
231
232 pr_warn("reserve caps ctx=%p ENOMEM need=%d got=%d\n",
233 ctx, need, have + alloc);
234 goto out_nomem;
235 }
236 BUG_ON(have + alloc != need);
237
238 spin_lock(&mdsc->caps_list_lock);
239 mdsc->caps_total_count += alloc;
240 mdsc->caps_reserve_count += alloc;
241 list_splice(&newcaps, &mdsc->caps_list);
242
243 BUG_ON(mdsc->caps_total_count != mdsc->caps_use_count +
244 mdsc->caps_reserve_count +
245 mdsc->caps_avail_count);
246 spin_unlock(&mdsc->caps_list_lock);
247
248 ctx->count = need;
249 dout("reserve caps ctx=%p %d = %d used + %d resv + %d avail\n",
250 ctx, mdsc->caps_total_count, mdsc->caps_use_count,
251 mdsc->caps_reserve_count, mdsc->caps_avail_count);
252 return 0;
253
254out_nomem:
255
256 spin_lock(&mdsc->caps_list_lock);
257 mdsc->caps_avail_count += have;
258 mdsc->caps_reserve_count -= have;
259
260 while (!list_empty(&newcaps)) {
261 cap = list_first_entry(&newcaps,
262 struct ceph_cap, caps_item);
263 list_del(&cap->caps_item);
264
265 /* Keep some preallocated caps around (ceph_min_count), to
266 * avoid lots of free/alloc churn. */
267 if (mdsc->caps_avail_count >=
268 mdsc->caps_reserve_count + mdsc->caps_min_count) {
269 kmem_cache_free(ceph_cap_cachep, cap);
270 } else {
271 mdsc->caps_avail_count++;
272 mdsc->caps_total_count++;
273 list_add(&cap->caps_item, &mdsc->caps_list);
274 }
275 }
276
277 BUG_ON(mdsc->caps_total_count != mdsc->caps_use_count +
278 mdsc->caps_reserve_count +
279 mdsc->caps_avail_count);
280 spin_unlock(&mdsc->caps_list_lock);
281 return -ENOMEM;
282}
283
284int ceph_unreserve_caps(struct ceph_mds_client *mdsc,
285 struct ceph_cap_reservation *ctx)
286{
287 int i;
288 struct ceph_cap *cap;
289
290 dout("unreserve caps ctx=%p count=%d\n", ctx, ctx->count);
291 if (ctx->count) {
292 spin_lock(&mdsc->caps_list_lock);
293 BUG_ON(mdsc->caps_reserve_count < ctx->count);
294 mdsc->caps_reserve_count -= ctx->count;
295 if (mdsc->caps_avail_count >=
296 mdsc->caps_reserve_count + mdsc->caps_min_count) {
297 mdsc->caps_total_count -= ctx->count;
298 for (i = 0; i < ctx->count; i++) {
299 cap = list_first_entry(&mdsc->caps_list,
300 struct ceph_cap, caps_item);
301 list_del(&cap->caps_item);
302 kmem_cache_free(ceph_cap_cachep, cap);
303 }
304 } else {
305 mdsc->caps_avail_count += ctx->count;
306 }
307 ctx->count = 0;
308 dout("unreserve caps %d = %d used + %d resv + %d avail\n",
309 mdsc->caps_total_count, mdsc->caps_use_count,
310 mdsc->caps_reserve_count, mdsc->caps_avail_count);
311 BUG_ON(mdsc->caps_total_count != mdsc->caps_use_count +
312 mdsc->caps_reserve_count +
313 mdsc->caps_avail_count);
314 spin_unlock(&mdsc->caps_list_lock);
315 }
316 return 0;
317}
318
319struct ceph_cap *ceph_get_cap(struct ceph_mds_client *mdsc,
320 struct ceph_cap_reservation *ctx)
321{
322 struct ceph_cap *cap = NULL;
323
324 /* temporary, until we do something about cap import/export */
325 if (!ctx) {
326 cap = kmem_cache_alloc(ceph_cap_cachep, GFP_NOFS);
327 if (cap) {
328 spin_lock(&mdsc->caps_list_lock);
329 mdsc->caps_use_count++;
330 mdsc->caps_total_count++;
331 spin_unlock(&mdsc->caps_list_lock);
332 } else {
333 spin_lock(&mdsc->caps_list_lock);
334 if (mdsc->caps_avail_count) {
335 BUG_ON(list_empty(&mdsc->caps_list));
336
337 mdsc->caps_avail_count--;
338 mdsc->caps_use_count++;
339 cap = list_first_entry(&mdsc->caps_list,
340 struct ceph_cap, caps_item);
341 list_del(&cap->caps_item);
342
343 BUG_ON(mdsc->caps_total_count != mdsc->caps_use_count +
344 mdsc->caps_reserve_count + mdsc->caps_avail_count);
345 }
346 spin_unlock(&mdsc->caps_list_lock);
347 }
348
349 return cap;
350 }
351
352 spin_lock(&mdsc->caps_list_lock);
353 dout("get_cap ctx=%p (%d) %d = %d used + %d resv + %d avail\n",
354 ctx, ctx->count, mdsc->caps_total_count, mdsc->caps_use_count,
355 mdsc->caps_reserve_count, mdsc->caps_avail_count);
356 BUG_ON(!ctx->count);
357 BUG_ON(ctx->count > mdsc->caps_reserve_count);
358 BUG_ON(list_empty(&mdsc->caps_list));
359
360 ctx->count--;
361 mdsc->caps_reserve_count--;
362 mdsc->caps_use_count++;
363
364 cap = list_first_entry(&mdsc->caps_list, struct ceph_cap, caps_item);
365 list_del(&cap->caps_item);
366
367 BUG_ON(mdsc->caps_total_count != mdsc->caps_use_count +
368 mdsc->caps_reserve_count + mdsc->caps_avail_count);
369 spin_unlock(&mdsc->caps_list_lock);
370 return cap;
371}
372
373void ceph_put_cap(struct ceph_mds_client *mdsc, struct ceph_cap *cap)
374{
375 spin_lock(&mdsc->caps_list_lock);
376 dout("put_cap %p %d = %d used + %d resv + %d avail\n",
377 cap, mdsc->caps_total_count, mdsc->caps_use_count,
378 mdsc->caps_reserve_count, mdsc->caps_avail_count);
379 mdsc->caps_use_count--;
380 /*
381 * Keep some preallocated caps around (ceph_min_count), to
382 * avoid lots of free/alloc churn.
383 */
384 if (mdsc->caps_avail_count >= mdsc->caps_reserve_count +
385 mdsc->caps_min_count) {
386 mdsc->caps_total_count--;
387 kmem_cache_free(ceph_cap_cachep, cap);
388 } else {
389 mdsc->caps_avail_count++;
390 list_add(&cap->caps_item, &mdsc->caps_list);
391 }
392
393 BUG_ON(mdsc->caps_total_count != mdsc->caps_use_count +
394 mdsc->caps_reserve_count + mdsc->caps_avail_count);
395 spin_unlock(&mdsc->caps_list_lock);
396}
397
398void ceph_reservation_status(struct ceph_fs_client *fsc,
399 int *total, int *avail, int *used, int *reserved,
400 int *min)
401{
402 struct ceph_mds_client *mdsc = fsc->mdsc;
403
404 spin_lock(&mdsc->caps_list_lock);
405
406 if (total)
407 *total = mdsc->caps_total_count;
408 if (avail)
409 *avail = mdsc->caps_avail_count;
410 if (used)
411 *used = mdsc->caps_use_count;
412 if (reserved)
413 *reserved = mdsc->caps_reserve_count;
414 if (min)
415 *min = mdsc->caps_min_count;
416
417 spin_unlock(&mdsc->caps_list_lock);
418}
419
420/*
421 * Find ceph_cap for given mds, if any.
422 *
423 * Called with i_ceph_lock held.
424 */
425static struct ceph_cap *__get_cap_for_mds(struct ceph_inode_info *ci, int mds)
426{
427 struct ceph_cap *cap;
428 struct rb_node *n = ci->i_caps.rb_node;
429
430 while (n) {
431 cap = rb_entry(n, struct ceph_cap, ci_node);
432 if (mds < cap->mds)
433 n = n->rb_left;
434 else if (mds > cap->mds)
435 n = n->rb_right;
436 else
437 return cap;
438 }
439 return NULL;
440}
441
442struct ceph_cap *ceph_get_cap_for_mds(struct ceph_inode_info *ci, int mds)
443{
444 struct ceph_cap *cap;
445
446 spin_lock(&ci->i_ceph_lock);
447 cap = __get_cap_for_mds(ci, mds);
448 spin_unlock(&ci->i_ceph_lock);
449 return cap;
450}
451
452/*
453 * Return id of any MDS with a cap, preferably FILE_WR|BUFFER|EXCL, else -1.
454 */
455static int __ceph_get_cap_mds(struct ceph_inode_info *ci)
456{
457 struct ceph_cap *cap;
458 int mds = -1;
459 struct rb_node *p;
460
461 /* prefer mds with WR|BUFFER|EXCL caps */
462 for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
463 cap = rb_entry(p, struct ceph_cap, ci_node);
464 mds = cap->mds;
465 if (cap->issued & (CEPH_CAP_FILE_WR |
466 CEPH_CAP_FILE_BUFFER |
467 CEPH_CAP_FILE_EXCL))
468 break;
469 }
470 return mds;
471}
472
473int ceph_get_cap_mds(struct inode *inode)
474{
475 struct ceph_inode_info *ci = ceph_inode(inode);
476 int mds;
477 spin_lock(&ci->i_ceph_lock);
478 mds = __ceph_get_cap_mds(ceph_inode(inode));
479 spin_unlock(&ci->i_ceph_lock);
480 return mds;
481}
482
483/*
484 * Called under i_ceph_lock.
485 */
486static void __insert_cap_node(struct ceph_inode_info *ci,
487 struct ceph_cap *new)
488{
489 struct rb_node **p = &ci->i_caps.rb_node;
490 struct rb_node *parent = NULL;
491 struct ceph_cap *cap = NULL;
492
493 while (*p) {
494 parent = *p;
495 cap = rb_entry(parent, struct ceph_cap, ci_node);
496 if (new->mds < cap->mds)
497 p = &(*p)->rb_left;
498 else if (new->mds > cap->mds)
499 p = &(*p)->rb_right;
500 else
501 BUG();
502 }
503
504 rb_link_node(&new->ci_node, parent, p);
505 rb_insert_color(&new->ci_node, &ci->i_caps);
506}
507
508/*
509 * (re)set cap hold timeouts, which control the delayed release
510 * of unused caps back to the MDS. Should be called on cap use.
511 */
512static void __cap_set_timeouts(struct ceph_mds_client *mdsc,
513 struct ceph_inode_info *ci)
514{
515 struct ceph_mount_options *ma = mdsc->fsc->mount_options;
516
517 ci->i_hold_caps_min = round_jiffies(jiffies +
518 ma->caps_wanted_delay_min * HZ);
519 ci->i_hold_caps_max = round_jiffies(jiffies +
520 ma->caps_wanted_delay_max * HZ);
521 dout("__cap_set_timeouts %p min %lu max %lu\n", &ci->vfs_inode,
522 ci->i_hold_caps_min - jiffies, ci->i_hold_caps_max - jiffies);
523}
524
525/*
526 * (Re)queue cap at the end of the delayed cap release list.
527 *
528 * If I_FLUSH is set, leave the inode at the front of the list.
529 *
530 * Caller holds i_ceph_lock
531 * -> we take mdsc->cap_delay_lock
532 */
533static void __cap_delay_requeue(struct ceph_mds_client *mdsc,
534 struct ceph_inode_info *ci)
535{
536 __cap_set_timeouts(mdsc, ci);
537 dout("__cap_delay_requeue %p flags %d at %lu\n", &ci->vfs_inode,
538 ci->i_ceph_flags, ci->i_hold_caps_max);
539 if (!mdsc->stopping) {
540 spin_lock(&mdsc->cap_delay_lock);
541 if (!list_empty(&ci->i_cap_delay_list)) {
542 if (ci->i_ceph_flags & CEPH_I_FLUSH)
543 goto no_change;
544 list_del_init(&ci->i_cap_delay_list);
545 }
546 list_add_tail(&ci->i_cap_delay_list, &mdsc->cap_delay_list);
547no_change:
548 spin_unlock(&mdsc->cap_delay_lock);
549 }
550}
551
552/*
553 * Queue an inode for immediate writeback. Mark inode with I_FLUSH,
554 * indicating we should send a cap message to flush dirty metadata
555 * asap, and move to the front of the delayed cap list.
556 */
557static void __cap_delay_requeue_front(struct ceph_mds_client *mdsc,
558 struct ceph_inode_info *ci)
559{
560 dout("__cap_delay_requeue_front %p\n", &ci->vfs_inode);
561 spin_lock(&mdsc->cap_delay_lock);
562 ci->i_ceph_flags |= CEPH_I_FLUSH;
563 if (!list_empty(&ci->i_cap_delay_list))
564 list_del_init(&ci->i_cap_delay_list);
565 list_add(&ci->i_cap_delay_list, &mdsc->cap_delay_list);
566 spin_unlock(&mdsc->cap_delay_lock);
567}
568
569/*
570 * Cancel delayed work on cap.
571 *
572 * Caller must hold i_ceph_lock.
573 */
574static void __cap_delay_cancel(struct ceph_mds_client *mdsc,
575 struct ceph_inode_info *ci)
576{
577 dout("__cap_delay_cancel %p\n", &ci->vfs_inode);
578 if (list_empty(&ci->i_cap_delay_list))
579 return;
580 spin_lock(&mdsc->cap_delay_lock);
581 list_del_init(&ci->i_cap_delay_list);
582 spin_unlock(&mdsc->cap_delay_lock);
583}
584
585/*
586 * Common issue checks for add_cap, handle_cap_grant.
587 */
588static void __check_cap_issue(struct ceph_inode_info *ci, struct ceph_cap *cap,
589 unsigned issued)
590{
591 unsigned had = __ceph_caps_issued(ci, NULL);
592
593 /*
594 * Each time we receive FILE_CACHE anew, we increment
595 * i_rdcache_gen.
596 */
597 if ((issued & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) &&
598 (had & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) == 0) {
599 ci->i_rdcache_gen++;
600 }
601
602 /*
603 * If FILE_SHARED is newly issued, mark dir not complete. We don't
604 * know what happened to this directory while we didn't have the cap.
605 * If FILE_SHARED is being revoked, also mark dir not complete. It
606 * stops on-going cached readdir.
607 */
608 if ((issued & CEPH_CAP_FILE_SHARED) != (had & CEPH_CAP_FILE_SHARED)) {
609 if (issued & CEPH_CAP_FILE_SHARED)
610 atomic_inc(&ci->i_shared_gen);
611 if (S_ISDIR(ci->vfs_inode.i_mode)) {
612 dout(" marking %p NOT complete\n", &ci->vfs_inode);
613 __ceph_dir_clear_complete(ci);
614 }
615 }
616}
617
618/*
619 * Add a capability under the given MDS session.
620 *
621 * Caller should hold session snap_rwsem (read) and s_mutex.
622 *
623 * @fmode is the open file mode, if we are opening a file, otherwise
624 * it is < 0. (This is so we can atomically add the cap and add an
625 * open file reference to it.)
626 */
627void ceph_add_cap(struct inode *inode,
628 struct ceph_mds_session *session, u64 cap_id,
629 int fmode, unsigned issued, unsigned wanted,
630 unsigned seq, unsigned mseq, u64 realmino, int flags,
631 struct ceph_cap **new_cap)
632{
633 struct ceph_mds_client *mdsc = ceph_inode_to_client(inode)->mdsc;
634 struct ceph_inode_info *ci = ceph_inode(inode);
635 struct ceph_cap *cap;
636 int mds = session->s_mds;
637 int actual_wanted;
638
639 dout("add_cap %p mds%d cap %llx %s seq %d\n", inode,
640 session->s_mds, cap_id, ceph_cap_string(issued), seq);
641
642 /*
643 * If we are opening the file, include file mode wanted bits
644 * in wanted.
645 */
646 if (fmode >= 0)
647 wanted |= ceph_caps_for_mode(fmode);
648
649 cap = __get_cap_for_mds(ci, mds);
650 if (!cap) {
651 cap = *new_cap;
652 *new_cap = NULL;
653
654 cap->issued = 0;
655 cap->implemented = 0;
656 cap->mds = mds;
657 cap->mds_wanted = 0;
658 cap->mseq = 0;
659
660 cap->ci = ci;
661 __insert_cap_node(ci, cap);
662
663 /* add to session cap list */
664 cap->session = session;
665 spin_lock(&session->s_cap_lock);
666 list_add_tail(&cap->session_caps, &session->s_caps);
667 session->s_nr_caps++;
668 spin_unlock(&session->s_cap_lock);
669 } else {
670 /*
671 * auth mds of the inode changed. we received the cap export
672 * message, but still haven't received the cap import message.
673 * handle_cap_export() updated the new auth MDS' cap.
674 *
675 * "ceph_seq_cmp(seq, cap->seq) <= 0" means we are processing
676 * a message that was send before the cap import message. So
677 * don't remove caps.
678 */
679 if (ceph_seq_cmp(seq, cap->seq) <= 0) {
680 WARN_ON(cap != ci->i_auth_cap);
681 WARN_ON(cap->cap_id != cap_id);
682 seq = cap->seq;
683 mseq = cap->mseq;
684 issued |= cap->issued;
685 flags |= CEPH_CAP_FLAG_AUTH;
686 }
687 }
688
689 if (!ci->i_snap_realm ||
690 ((flags & CEPH_CAP_FLAG_AUTH) &&
691 realmino != (u64)-1 && ci->i_snap_realm->ino != realmino)) {
692 /*
693 * add this inode to the appropriate snap realm
694 */
695 struct ceph_snap_realm *realm = ceph_lookup_snap_realm(mdsc,
696 realmino);
697 if (realm) {
698 struct ceph_snap_realm *oldrealm = ci->i_snap_realm;
699 if (oldrealm) {
700 spin_lock(&oldrealm->inodes_with_caps_lock);
701 list_del_init(&ci->i_snap_realm_item);
702 spin_unlock(&oldrealm->inodes_with_caps_lock);
703 }
704
705 spin_lock(&realm->inodes_with_caps_lock);
706 list_add(&ci->i_snap_realm_item,
707 &realm->inodes_with_caps);
708 ci->i_snap_realm = realm;
709 if (realm->ino == ci->i_vino.ino)
710 realm->inode = inode;
711 spin_unlock(&realm->inodes_with_caps_lock);
712
713 if (oldrealm)
714 ceph_put_snap_realm(mdsc, oldrealm);
715 } else {
716 pr_err("ceph_add_cap: couldn't find snap realm %llx\n",
717 realmino);
718 WARN_ON(!realm);
719 }
720 }
721
722 __check_cap_issue(ci, cap, issued);
723
724 /*
725 * If we are issued caps we don't want, or the mds' wanted
726 * value appears to be off, queue a check so we'll release
727 * later and/or update the mds wanted value.
728 */
729 actual_wanted = __ceph_caps_wanted(ci);
730 if ((wanted & ~actual_wanted) ||
731 (issued & ~actual_wanted & CEPH_CAP_ANY_WR)) {
732 dout(" issued %s, mds wanted %s, actual %s, queueing\n",
733 ceph_cap_string(issued), ceph_cap_string(wanted),
734 ceph_cap_string(actual_wanted));
735 __cap_delay_requeue(mdsc, ci);
736 }
737
738 if (flags & CEPH_CAP_FLAG_AUTH) {
739 if (!ci->i_auth_cap ||
740 ceph_seq_cmp(ci->i_auth_cap->mseq, mseq) < 0) {
741 ci->i_auth_cap = cap;
742 cap->mds_wanted = wanted;
743 }
744 } else {
745 WARN_ON(ci->i_auth_cap == cap);
746 }
747
748 dout("add_cap inode %p (%llx.%llx) cap %p %s now %s seq %d mds%d\n",
749 inode, ceph_vinop(inode), cap, ceph_cap_string(issued),
750 ceph_cap_string(issued|cap->issued), seq, mds);
751 cap->cap_id = cap_id;
752 cap->issued = issued;
753 cap->implemented |= issued;
754 if (ceph_seq_cmp(mseq, cap->mseq) > 0)
755 cap->mds_wanted = wanted;
756 else
757 cap->mds_wanted |= wanted;
758 cap->seq = seq;
759 cap->issue_seq = seq;
760 cap->mseq = mseq;
761 cap->cap_gen = session->s_cap_gen;
762
763 if (fmode >= 0)
764 __ceph_get_fmode(ci, fmode);
765}
766
767/*
768 * Return true if cap has not timed out and belongs to the current
769 * generation of the MDS session (i.e. has not gone 'stale' due to
770 * us losing touch with the mds).
771 */
772static int __cap_is_valid(struct ceph_cap *cap)
773{
774 unsigned long ttl;
775 u32 gen;
776
777 spin_lock(&cap->session->s_gen_ttl_lock);
778 gen = cap->session->s_cap_gen;
779 ttl = cap->session->s_cap_ttl;
780 spin_unlock(&cap->session->s_gen_ttl_lock);
781
782 if (cap->cap_gen < gen || time_after_eq(jiffies, ttl)) {
783 dout("__cap_is_valid %p cap %p issued %s "
784 "but STALE (gen %u vs %u)\n", &cap->ci->vfs_inode,
785 cap, ceph_cap_string(cap->issued), cap->cap_gen, gen);
786 return 0;
787 }
788
789 return 1;
790}
791
792/*
793 * Return set of valid cap bits issued to us. Note that caps time
794 * out, and may be invalidated in bulk if the client session times out
795 * and session->s_cap_gen is bumped.
796 */
797int __ceph_caps_issued(struct ceph_inode_info *ci, int *implemented)
798{
799 int have = ci->i_snap_caps;
800 struct ceph_cap *cap;
801 struct rb_node *p;
802
803 if (implemented)
804 *implemented = 0;
805 for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
806 cap = rb_entry(p, struct ceph_cap, ci_node);
807 if (!__cap_is_valid(cap))
808 continue;
809 dout("__ceph_caps_issued %p cap %p issued %s\n",
810 &ci->vfs_inode, cap, ceph_cap_string(cap->issued));
811 have |= cap->issued;
812 if (implemented)
813 *implemented |= cap->implemented;
814 }
815 /*
816 * exclude caps issued by non-auth MDS, but are been revoking
817 * by the auth MDS. The non-auth MDS should be revoking/exporting
818 * these caps, but the message is delayed.
819 */
820 if (ci->i_auth_cap) {
821 cap = ci->i_auth_cap;
822 have &= ~cap->implemented | cap->issued;
823 }
824 return have;
825}
826
827/*
828 * Get cap bits issued by caps other than @ocap
829 */
830int __ceph_caps_issued_other(struct ceph_inode_info *ci, struct ceph_cap *ocap)
831{
832 int have = ci->i_snap_caps;
833 struct ceph_cap *cap;
834 struct rb_node *p;
835
836 for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
837 cap = rb_entry(p, struct ceph_cap, ci_node);
838 if (cap == ocap)
839 continue;
840 if (!__cap_is_valid(cap))
841 continue;
842 have |= cap->issued;
843 }
844 return have;
845}
846
847/*
848 * Move a cap to the end of the LRU (oldest caps at list head, newest
849 * at list tail).
850 */
851static void __touch_cap(struct ceph_cap *cap)
852{
853 struct ceph_mds_session *s = cap->session;
854
855 spin_lock(&s->s_cap_lock);
856 if (!s->s_cap_iterator) {
857 dout("__touch_cap %p cap %p mds%d\n", &cap->ci->vfs_inode, cap,
858 s->s_mds);
859 list_move_tail(&cap->session_caps, &s->s_caps);
860 } else {
861 dout("__touch_cap %p cap %p mds%d NOP, iterating over caps\n",
862 &cap->ci->vfs_inode, cap, s->s_mds);
863 }
864 spin_unlock(&s->s_cap_lock);
865}
866
867/*
868 * Check if we hold the given mask. If so, move the cap(s) to the
869 * front of their respective LRUs. (This is the preferred way for
870 * callers to check for caps they want.)
871 */
872int __ceph_caps_issued_mask(struct ceph_inode_info *ci, int mask, int touch)
873{
874 struct ceph_cap *cap;
875 struct rb_node *p;
876 int have = ci->i_snap_caps;
877
878 if ((have & mask) == mask) {
879 dout("__ceph_caps_issued_mask %p snap issued %s"
880 " (mask %s)\n", &ci->vfs_inode,
881 ceph_cap_string(have),
882 ceph_cap_string(mask));
883 return 1;
884 }
885
886 for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
887 cap = rb_entry(p, struct ceph_cap, ci_node);
888 if (!__cap_is_valid(cap))
889 continue;
890 if ((cap->issued & mask) == mask) {
891 dout("__ceph_caps_issued_mask %p cap %p issued %s"
892 " (mask %s)\n", &ci->vfs_inode, cap,
893 ceph_cap_string(cap->issued),
894 ceph_cap_string(mask));
895 if (touch)
896 __touch_cap(cap);
897 return 1;
898 }
899
900 /* does a combination of caps satisfy mask? */
901 have |= cap->issued;
902 if ((have & mask) == mask) {
903 dout("__ceph_caps_issued_mask %p combo issued %s"
904 " (mask %s)\n", &ci->vfs_inode,
905 ceph_cap_string(cap->issued),
906 ceph_cap_string(mask));
907 if (touch) {
908 struct rb_node *q;
909
910 /* touch this + preceding caps */
911 __touch_cap(cap);
912 for (q = rb_first(&ci->i_caps); q != p;
913 q = rb_next(q)) {
914 cap = rb_entry(q, struct ceph_cap,
915 ci_node);
916 if (!__cap_is_valid(cap))
917 continue;
918 __touch_cap(cap);
919 }
920 }
921 return 1;
922 }
923 }
924
925 return 0;
926}
927
928/*
929 * Return true if mask caps are currently being revoked by an MDS.
930 */
931int __ceph_caps_revoking_other(struct ceph_inode_info *ci,
932 struct ceph_cap *ocap, int mask)
933{
934 struct ceph_cap *cap;
935 struct rb_node *p;
936
937 for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
938 cap = rb_entry(p, struct ceph_cap, ci_node);
939 if (cap != ocap &&
940 (cap->implemented & ~cap->issued & mask))
941 return 1;
942 }
943 return 0;
944}
945
946int ceph_caps_revoking(struct ceph_inode_info *ci, int mask)
947{
948 struct inode *inode = &ci->vfs_inode;
949 int ret;
950
951 spin_lock(&ci->i_ceph_lock);
952 ret = __ceph_caps_revoking_other(ci, NULL, mask);
953 spin_unlock(&ci->i_ceph_lock);
954 dout("ceph_caps_revoking %p %s = %d\n", inode,
955 ceph_cap_string(mask), ret);
956 return ret;
957}
958
959int __ceph_caps_used(struct ceph_inode_info *ci)
960{
961 int used = 0;
962 if (ci->i_pin_ref)
963 used |= CEPH_CAP_PIN;
964 if (ci->i_rd_ref)
965 used |= CEPH_CAP_FILE_RD;
966 if (ci->i_rdcache_ref ||
967 (!S_ISDIR(ci->vfs_inode.i_mode) && /* ignore readdir cache */
968 ci->vfs_inode.i_data.nrpages))
969 used |= CEPH_CAP_FILE_CACHE;
970 if (ci->i_wr_ref)
971 used |= CEPH_CAP_FILE_WR;
972 if (ci->i_wb_ref || ci->i_wrbuffer_ref)
973 used |= CEPH_CAP_FILE_BUFFER;
974 return used;
975}
976
977/*
978 * wanted, by virtue of open file modes
979 */
980int __ceph_caps_file_wanted(struct ceph_inode_info *ci)
981{
982 int i, bits = 0;
983 for (i = 0; i < CEPH_FILE_MODE_BITS; i++) {
984 if (ci->i_nr_by_mode[i])
985 bits |= 1 << i;
986 }
987 if (bits == 0)
988 return 0;
989 return ceph_caps_for_mode(bits >> 1);
990}
991
992/*
993 * Return caps we have registered with the MDS(s) as 'wanted'.
994 */
995int __ceph_caps_mds_wanted(struct ceph_inode_info *ci, bool check)
996{
997 struct ceph_cap *cap;
998 struct rb_node *p;
999 int mds_wanted = 0;
1000
1001 for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
1002 cap = rb_entry(p, struct ceph_cap, ci_node);
1003 if (check && !__cap_is_valid(cap))
1004 continue;
1005 if (cap == ci->i_auth_cap)
1006 mds_wanted |= cap->mds_wanted;
1007 else
1008 mds_wanted |= (cap->mds_wanted & ~CEPH_CAP_ANY_FILE_WR);
1009 }
1010 return mds_wanted;
1011}
1012
1013/*
1014 * called under i_ceph_lock
1015 */
1016static int __ceph_is_single_caps(struct ceph_inode_info *ci)
1017{
1018 return rb_first(&ci->i_caps) == rb_last(&ci->i_caps);
1019}
1020
1021static int __ceph_is_any_caps(struct ceph_inode_info *ci)
1022{
1023 return !RB_EMPTY_ROOT(&ci->i_caps);
1024}
1025
1026int ceph_is_any_caps(struct inode *inode)
1027{
1028 struct ceph_inode_info *ci = ceph_inode(inode);
1029 int ret;
1030
1031 spin_lock(&ci->i_ceph_lock);
1032 ret = __ceph_is_any_caps(ci);
1033 spin_unlock(&ci->i_ceph_lock);
1034
1035 return ret;
1036}
1037
1038static void drop_inode_snap_realm(struct ceph_inode_info *ci)
1039{
1040 struct ceph_snap_realm *realm = ci->i_snap_realm;
1041 spin_lock(&realm->inodes_with_caps_lock);
1042 list_del_init(&ci->i_snap_realm_item);
1043 ci->i_snap_realm_counter++;
1044 ci->i_snap_realm = NULL;
1045 spin_unlock(&realm->inodes_with_caps_lock);
1046 ceph_put_snap_realm(ceph_sb_to_client(ci->vfs_inode.i_sb)->mdsc,
1047 realm);
1048}
1049
1050/*
1051 * Remove a cap. Take steps to deal with a racing iterate_session_caps.
1052 *
1053 * caller should hold i_ceph_lock.
1054 * caller will not hold session s_mutex if called from destroy_inode.
1055 */
1056void __ceph_remove_cap(struct ceph_cap *cap, bool queue_release)
1057{
1058 struct ceph_mds_session *session = cap->session;
1059 struct ceph_inode_info *ci = cap->ci;
1060 struct ceph_mds_client *mdsc =
1061 ceph_sb_to_client(ci->vfs_inode.i_sb)->mdsc;
1062 int removed = 0;
1063
1064 dout("__ceph_remove_cap %p from %p\n", cap, &ci->vfs_inode);
1065
1066 /* remove from session list */
1067 spin_lock(&session->s_cap_lock);
1068 if (session->s_cap_iterator == cap) {
1069 /* not yet, we are iterating over this very cap */
1070 dout("__ceph_remove_cap delaying %p removal from session %p\n",
1071 cap, cap->session);
1072 } else {
1073 list_del_init(&cap->session_caps);
1074 session->s_nr_caps--;
1075 cap->session = NULL;
1076 removed = 1;
1077 }
1078 /* protect backpointer with s_cap_lock: see iterate_session_caps */
1079 cap->ci = NULL;
1080
1081 /*
1082 * s_cap_reconnect is protected by s_cap_lock. no one changes
1083 * s_cap_gen while session is in the reconnect state.
1084 */
1085 if (queue_release &&
1086 (!session->s_cap_reconnect || cap->cap_gen == session->s_cap_gen)) {
1087 cap->queue_release = 1;
1088 if (removed) {
1089 list_add_tail(&cap->session_caps,
1090 &session->s_cap_releases);
1091 session->s_num_cap_releases++;
1092 removed = 0;
1093 }
1094 } else {
1095 cap->queue_release = 0;
1096 }
1097 cap->cap_ino = ci->i_vino.ino;
1098
1099 spin_unlock(&session->s_cap_lock);
1100
1101 /* remove from inode list */
1102 rb_erase(&cap->ci_node, &ci->i_caps);
1103 if (ci->i_auth_cap == cap)
1104 ci->i_auth_cap = NULL;
1105
1106 if (removed)
1107 ceph_put_cap(mdsc, cap);
1108
1109 /* when reconnect denied, we remove session caps forcibly,
1110 * i_wr_ref can be non-zero. If there are ongoing write,
1111 * keep i_snap_realm.
1112 */
1113 if (!__ceph_is_any_caps(ci) && ci->i_wr_ref == 0 && ci->i_snap_realm)
1114 drop_inode_snap_realm(ci);
1115
1116 if (!__ceph_is_any_real_caps(ci))
1117 __cap_delay_cancel(mdsc, ci);
1118}
1119
1120struct cap_msg_args {
1121 struct ceph_mds_session *session;
1122 u64 ino, cid, follows;
1123 u64 flush_tid, oldest_flush_tid, size, max_size;
1124 u64 xattr_version;
1125 struct ceph_buffer *xattr_buf;
1126 struct timespec atime, mtime, ctime;
1127 int op, caps, wanted, dirty;
1128 u32 seq, issue_seq, mseq, time_warp_seq;
1129 u32 flags;
1130 kuid_t uid;
1131 kgid_t gid;
1132 umode_t mode;
1133 bool inline_data;
1134};
1135
1136/*
1137 * Build and send a cap message to the given MDS.
1138 *
1139 * Caller should be holding s_mutex.
1140 */
1141static int send_cap_msg(struct cap_msg_args *arg)
1142{
1143 struct ceph_mds_caps *fc;
1144 struct ceph_msg *msg;
1145 void *p;
1146 size_t extra_len;
1147 struct timespec zerotime = {0};
1148 struct ceph_osd_client *osdc = &arg->session->s_mdsc->fsc->client->osdc;
1149
1150 dout("send_cap_msg %s %llx %llx caps %s wanted %s dirty %s"
1151 " seq %u/%u tid %llu/%llu mseq %u follows %lld size %llu/%llu"
1152 " xattr_ver %llu xattr_len %d\n", ceph_cap_op_name(arg->op),
1153 arg->cid, arg->ino, ceph_cap_string(arg->caps),
1154 ceph_cap_string(arg->wanted), ceph_cap_string(arg->dirty),
1155 arg->seq, arg->issue_seq, arg->flush_tid, arg->oldest_flush_tid,
1156 arg->mseq, arg->follows, arg->size, arg->max_size,
1157 arg->xattr_version,
1158 arg->xattr_buf ? (int)arg->xattr_buf->vec.iov_len : 0);
1159
1160 /* flock buffer size + inline version + inline data size +
1161 * osd_epoch_barrier + oldest_flush_tid */
1162 extra_len = 4 + 8 + 4 + 4 + 8 + 4 + 4 + 4 + 8 + 8 + 4;
1163 msg = ceph_msg_new(CEPH_MSG_CLIENT_CAPS, sizeof(*fc) + extra_len,
1164 GFP_NOFS, false);
1165 if (!msg)
1166 return -ENOMEM;
1167
1168 msg->hdr.version = cpu_to_le16(10);
1169 msg->hdr.tid = cpu_to_le64(arg->flush_tid);
1170
1171 fc = msg->front.iov_base;
1172 memset(fc, 0, sizeof(*fc));
1173
1174 fc->cap_id = cpu_to_le64(arg->cid);
1175 fc->op = cpu_to_le32(arg->op);
1176 fc->seq = cpu_to_le32(arg->seq);
1177 fc->issue_seq = cpu_to_le32(arg->issue_seq);
1178 fc->migrate_seq = cpu_to_le32(arg->mseq);
1179 fc->caps = cpu_to_le32(arg->caps);
1180 fc->wanted = cpu_to_le32(arg->wanted);
1181 fc->dirty = cpu_to_le32(arg->dirty);
1182 fc->ino = cpu_to_le64(arg->ino);
1183 fc->snap_follows = cpu_to_le64(arg->follows);
1184
1185 fc->size = cpu_to_le64(arg->size);
1186 fc->max_size = cpu_to_le64(arg->max_size);
1187 ceph_encode_timespec(&fc->mtime, &arg->mtime);
1188 ceph_encode_timespec(&fc->atime, &arg->atime);
1189 ceph_encode_timespec(&fc->ctime, &arg->ctime);
1190 fc->time_warp_seq = cpu_to_le32(arg->time_warp_seq);
1191
1192 fc->uid = cpu_to_le32(from_kuid(&init_user_ns, arg->uid));
1193 fc->gid = cpu_to_le32(from_kgid(&init_user_ns, arg->gid));
1194 fc->mode = cpu_to_le32(arg->mode);
1195
1196 fc->xattr_version = cpu_to_le64(arg->xattr_version);
1197 if (arg->xattr_buf) {
1198 msg->middle = ceph_buffer_get(arg->xattr_buf);
1199 fc->xattr_len = cpu_to_le32(arg->xattr_buf->vec.iov_len);
1200 msg->hdr.middle_len = cpu_to_le32(arg->xattr_buf->vec.iov_len);
1201 }
1202
1203 p = fc + 1;
1204 /* flock buffer size (version 2) */
1205 ceph_encode_32(&p, 0);
1206 /* inline version (version 4) */
1207 ceph_encode_64(&p, arg->inline_data ? 0 : CEPH_INLINE_NONE);
1208 /* inline data size */
1209 ceph_encode_32(&p, 0);
1210 /*
1211 * osd_epoch_barrier (version 5)
1212 * The epoch_barrier is protected osdc->lock, so READ_ONCE here in
1213 * case it was recently changed
1214 */
1215 ceph_encode_32(&p, READ_ONCE(osdc->epoch_barrier));
1216 /* oldest_flush_tid (version 6) */
1217 ceph_encode_64(&p, arg->oldest_flush_tid);
1218
1219 /*
1220 * caller_uid/caller_gid (version 7)
1221 *
1222 * Currently, we don't properly track which caller dirtied the caps
1223 * last, and force a flush of them when there is a conflict. For now,
1224 * just set this to 0:0, to emulate how the MDS has worked up to now.
1225 */
1226 ceph_encode_32(&p, 0);
1227 ceph_encode_32(&p, 0);
1228
1229 /* pool namespace (version 8) (mds always ignores this) */
1230 ceph_encode_32(&p, 0);
1231
1232 /*
1233 * btime and change_attr (version 9)
1234 *
1235 * We just zero these out for now, as the MDS ignores them unless
1236 * the requisite feature flags are set (which we don't do yet).
1237 */
1238 ceph_encode_timespec(p, &zerotime);
1239 p += sizeof(struct ceph_timespec);
1240 ceph_encode_64(&p, 0);
1241
1242 /* Advisory flags (version 10) */
1243 ceph_encode_32(&p, arg->flags);
1244
1245 ceph_con_send(&arg->session->s_con, msg);
1246 return 0;
1247}
1248
1249/*
1250 * Queue cap releases when an inode is dropped from our cache. Since
1251 * inode is about to be destroyed, there is no need for i_ceph_lock.
1252 */
1253void ceph_queue_caps_release(struct inode *inode)
1254{
1255 struct ceph_inode_info *ci = ceph_inode(inode);
1256 struct rb_node *p;
1257
1258 p = rb_first(&ci->i_caps);
1259 while (p) {
1260 struct ceph_cap *cap = rb_entry(p, struct ceph_cap, ci_node);
1261 p = rb_next(p);
1262 __ceph_remove_cap(cap, true);
1263 }
1264}
1265
1266/*
1267 * Send a cap msg on the given inode. Update our caps state, then
1268 * drop i_ceph_lock and send the message.
1269 *
1270 * Make note of max_size reported/requested from mds, revoked caps
1271 * that have now been implemented.
1272 *
1273 * Make half-hearted attempt ot to invalidate page cache if we are
1274 * dropping RDCACHE. Note that this will leave behind locked pages
1275 * that we'll then need to deal with elsewhere.
1276 *
1277 * Return non-zero if delayed release, or we experienced an error
1278 * such that the caller should requeue + retry later.
1279 *
1280 * called with i_ceph_lock, then drops it.
1281 * caller should hold snap_rwsem (read), s_mutex.
1282 */
1283static int __send_cap(struct ceph_mds_client *mdsc, struct ceph_cap *cap,
1284 int op, bool sync, int used, int want, int retain,
1285 int flushing, u64 flush_tid, u64 oldest_flush_tid)
1286 __releases(cap->ci->i_ceph_lock)
1287{
1288 struct ceph_inode_info *ci = cap->ci;
1289 struct inode *inode = &ci->vfs_inode;
1290 struct cap_msg_args arg;
1291 int held, revoking;
1292 int wake = 0;
1293 int delayed = 0;
1294 int ret;
1295
1296 held = cap->issued | cap->implemented;
1297 revoking = cap->implemented & ~cap->issued;
1298 retain &= ~revoking;
1299
1300 dout("__send_cap %p cap %p session %p %s -> %s (revoking %s)\n",
1301 inode, cap, cap->session,
1302 ceph_cap_string(held), ceph_cap_string(held & retain),
1303 ceph_cap_string(revoking));
1304 BUG_ON((retain & CEPH_CAP_PIN) == 0);
1305
1306 arg.session = cap->session;
1307
1308 /* don't release wanted unless we've waited a bit. */
1309 if ((ci->i_ceph_flags & CEPH_I_NODELAY) == 0 &&
1310 time_before(jiffies, ci->i_hold_caps_min)) {
1311 dout(" delaying issued %s -> %s, wanted %s -> %s on send\n",
1312 ceph_cap_string(cap->issued),
1313 ceph_cap_string(cap->issued & retain),
1314 ceph_cap_string(cap->mds_wanted),
1315 ceph_cap_string(want));
1316 want |= cap->mds_wanted;
1317 retain |= cap->issued;
1318 delayed = 1;
1319 }
1320 ci->i_ceph_flags &= ~(CEPH_I_NODELAY | CEPH_I_FLUSH);
1321 if (want & ~cap->mds_wanted) {
1322 /* user space may open/close single file frequently.
1323 * This avoids droping mds_wanted immediately after
1324 * requesting new mds_wanted.
1325 */
1326 __cap_set_timeouts(mdsc, ci);
1327 }
1328
1329 cap->issued &= retain; /* drop bits we don't want */
1330 if (cap->implemented & ~cap->issued) {
1331 /*
1332 * Wake up any waiters on wanted -> needed transition.
1333 * This is due to the weird transition from buffered
1334 * to sync IO... we need to flush dirty pages _before_
1335 * allowing sync writes to avoid reordering.
1336 */
1337 wake = 1;
1338 }
1339 cap->implemented &= cap->issued | used;
1340 cap->mds_wanted = want;
1341
1342 arg.ino = ceph_vino(inode).ino;
1343 arg.cid = cap->cap_id;
1344 arg.follows = flushing ? ci->i_head_snapc->seq : 0;
1345 arg.flush_tid = flush_tid;
1346 arg.oldest_flush_tid = oldest_flush_tid;
1347
1348 arg.size = inode->i_size;
1349 ci->i_reported_size = arg.size;
1350 arg.max_size = ci->i_wanted_max_size;
1351 ci->i_requested_max_size = arg.max_size;
1352
1353 if (flushing & CEPH_CAP_XATTR_EXCL) {
1354 __ceph_build_xattrs_blob(ci);
1355 arg.xattr_version = ci->i_xattrs.version;
1356 arg.xattr_buf = ci->i_xattrs.blob;
1357 } else {
1358 arg.xattr_buf = NULL;
1359 }
1360
1361 arg.mtime = inode->i_mtime;
1362 arg.atime = inode->i_atime;
1363 arg.ctime = inode->i_ctime;
1364
1365 arg.op = op;
1366 arg.caps = cap->implemented;
1367 arg.wanted = want;
1368 arg.dirty = flushing;
1369
1370 arg.seq = cap->seq;
1371 arg.issue_seq = cap->issue_seq;
1372 arg.mseq = cap->mseq;
1373 arg.time_warp_seq = ci->i_time_warp_seq;
1374
1375 arg.uid = inode->i_uid;
1376 arg.gid = inode->i_gid;
1377 arg.mode = inode->i_mode;
1378
1379 arg.inline_data = ci->i_inline_version != CEPH_INLINE_NONE;
1380 if (list_empty(&ci->i_cap_snaps))
1381 arg.flags = CEPH_CLIENT_CAPS_NO_CAPSNAP;
1382 else
1383 arg.flags = CEPH_CLIENT_CAPS_PENDING_CAPSNAP;
1384 if (sync)
1385 arg.flags |= CEPH_CLIENT_CAPS_SYNC;
1386
1387 spin_unlock(&ci->i_ceph_lock);
1388
1389 ret = send_cap_msg(&arg);
1390 if (ret < 0) {
1391 dout("error sending cap msg, must requeue %p\n", inode);
1392 delayed = 1;
1393 }
1394
1395 if (wake)
1396 wake_up_all(&ci->i_cap_wq);
1397
1398 return delayed;
1399}
1400
1401static inline int __send_flush_snap(struct inode *inode,
1402 struct ceph_mds_session *session,
1403 struct ceph_cap_snap *capsnap,
1404 u32 mseq, u64 oldest_flush_tid)
1405{
1406 struct cap_msg_args arg;
1407
1408 arg.session = session;
1409 arg.ino = ceph_vino(inode).ino;
1410 arg.cid = 0;
1411 arg.follows = capsnap->follows;
1412 arg.flush_tid = capsnap->cap_flush.tid;
1413 arg.oldest_flush_tid = oldest_flush_tid;
1414
1415 arg.size = capsnap->size;
1416 arg.max_size = 0;
1417 arg.xattr_version = capsnap->xattr_version;
1418 arg.xattr_buf = capsnap->xattr_blob;
1419
1420 arg.atime = capsnap->atime;
1421 arg.mtime = capsnap->mtime;
1422 arg.ctime = capsnap->ctime;
1423
1424 arg.op = CEPH_CAP_OP_FLUSHSNAP;
1425 arg.caps = capsnap->issued;
1426 arg.wanted = 0;
1427 arg.dirty = capsnap->dirty;
1428
1429 arg.seq = 0;
1430 arg.issue_seq = 0;
1431 arg.mseq = mseq;
1432 arg.time_warp_seq = capsnap->time_warp_seq;
1433
1434 arg.uid = capsnap->uid;
1435 arg.gid = capsnap->gid;
1436 arg.mode = capsnap->mode;
1437
1438 arg.inline_data = capsnap->inline_data;
1439 arg.flags = 0;
1440
1441 return send_cap_msg(&arg);
1442}
1443
1444/*
1445 * When a snapshot is taken, clients accumulate dirty metadata on
1446 * inodes with capabilities in ceph_cap_snaps to describe the file
1447 * state at the time the snapshot was taken. This must be flushed
1448 * asynchronously back to the MDS once sync writes complete and dirty
1449 * data is written out.
1450 *
1451 * Called under i_ceph_lock. Takes s_mutex as needed.
1452 */
1453static void __ceph_flush_snaps(struct ceph_inode_info *ci,
1454 struct ceph_mds_session *session)
1455 __releases(ci->i_ceph_lock)
1456 __acquires(ci->i_ceph_lock)
1457{
1458 struct inode *inode = &ci->vfs_inode;
1459 struct ceph_mds_client *mdsc = session->s_mdsc;
1460 struct ceph_cap_snap *capsnap;
1461 u64 oldest_flush_tid = 0;
1462 u64 first_tid = 1, last_tid = 0;
1463
1464 dout("__flush_snaps %p session %p\n", inode, session);
1465
1466 list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) {
1467 /*
1468 * we need to wait for sync writes to complete and for dirty
1469 * pages to be written out.
1470 */
1471 if (capsnap->dirty_pages || capsnap->writing)
1472 break;
1473
1474 /* should be removed by ceph_try_drop_cap_snap() */
1475 BUG_ON(!capsnap->need_flush);
1476
1477 /* only flush each capsnap once */
1478 if (capsnap->cap_flush.tid > 0) {
1479 dout(" already flushed %p, skipping\n", capsnap);
1480 continue;
1481 }
1482
1483 spin_lock(&mdsc->cap_dirty_lock);
1484 capsnap->cap_flush.tid = ++mdsc->last_cap_flush_tid;
1485 list_add_tail(&capsnap->cap_flush.g_list,
1486 &mdsc->cap_flush_list);
1487 if (oldest_flush_tid == 0)
1488 oldest_flush_tid = __get_oldest_flush_tid(mdsc);
1489 if (list_empty(&ci->i_flushing_item)) {
1490 list_add_tail(&ci->i_flushing_item,
1491 &session->s_cap_flushing);
1492 }
1493 spin_unlock(&mdsc->cap_dirty_lock);
1494
1495 list_add_tail(&capsnap->cap_flush.i_list,
1496 &ci->i_cap_flush_list);
1497
1498 if (first_tid == 1)
1499 first_tid = capsnap->cap_flush.tid;
1500 last_tid = capsnap->cap_flush.tid;
1501 }
1502
1503 ci->i_ceph_flags &= ~CEPH_I_FLUSH_SNAPS;
1504
1505 while (first_tid <= last_tid) {
1506 struct ceph_cap *cap = ci->i_auth_cap;
1507 struct ceph_cap_flush *cf;
1508 int ret;
1509
1510 if (!(cap && cap->session == session)) {
1511 dout("__flush_snaps %p auth cap %p not mds%d, "
1512 "stop\n", inode, cap, session->s_mds);
1513 break;
1514 }
1515
1516 ret = -ENOENT;
1517 list_for_each_entry(cf, &ci->i_cap_flush_list, i_list) {
1518 if (cf->tid >= first_tid) {
1519 ret = 0;
1520 break;
1521 }
1522 }
1523 if (ret < 0)
1524 break;
1525
1526 first_tid = cf->tid + 1;
1527
1528 capsnap = container_of(cf, struct ceph_cap_snap, cap_flush);
1529 refcount_inc(&capsnap->nref);
1530 spin_unlock(&ci->i_ceph_lock);
1531
1532 dout("__flush_snaps %p capsnap %p tid %llu %s\n",
1533 inode, capsnap, cf->tid, ceph_cap_string(capsnap->dirty));
1534
1535 ret = __send_flush_snap(inode, session, capsnap, cap->mseq,
1536 oldest_flush_tid);
1537 if (ret < 0) {
1538 pr_err("__flush_snaps: error sending cap flushsnap, "
1539 "ino (%llx.%llx) tid %llu follows %llu\n",
1540 ceph_vinop(inode), cf->tid, capsnap->follows);
1541 }
1542
1543 ceph_put_cap_snap(capsnap);
1544 spin_lock(&ci->i_ceph_lock);
1545 }
1546}
1547
1548void ceph_flush_snaps(struct ceph_inode_info *ci,
1549 struct ceph_mds_session **psession)
1550{
1551 struct inode *inode = &ci->vfs_inode;
1552 struct ceph_mds_client *mdsc = ceph_inode_to_client(inode)->mdsc;
1553 struct ceph_mds_session *session = NULL;
1554 int mds;
1555
1556 dout("ceph_flush_snaps %p\n", inode);
1557 if (psession)
1558 session = *psession;
1559retry:
1560 spin_lock(&ci->i_ceph_lock);
1561 if (!(ci->i_ceph_flags & CEPH_I_FLUSH_SNAPS)) {
1562 dout(" no capsnap needs flush, doing nothing\n");
1563 goto out;
1564 }
1565 if (!ci->i_auth_cap) {
1566 dout(" no auth cap (migrating?), doing nothing\n");
1567 goto out;
1568 }
1569
1570 mds = ci->i_auth_cap->session->s_mds;
1571 if (session && session->s_mds != mds) {
1572 dout(" oops, wrong session %p mutex\n", session);
1573 mutex_unlock(&session->s_mutex);
1574 ceph_put_mds_session(session);
1575 session = NULL;
1576 }
1577 if (!session) {
1578 spin_unlock(&ci->i_ceph_lock);
1579 mutex_lock(&mdsc->mutex);
1580 session = __ceph_lookup_mds_session(mdsc, mds);
1581 mutex_unlock(&mdsc->mutex);
1582 if (session) {
1583 dout(" inverting session/ino locks on %p\n", session);
1584 mutex_lock(&session->s_mutex);
1585 }
1586 goto retry;
1587 }
1588
1589 // make sure flushsnap messages are sent in proper order.
1590 if (ci->i_ceph_flags & CEPH_I_KICK_FLUSH) {
1591 __kick_flushing_caps(mdsc, session, ci, 0);
1592 ci->i_ceph_flags &= ~CEPH_I_KICK_FLUSH;
1593 }
1594
1595 __ceph_flush_snaps(ci, session);
1596out:
1597 spin_unlock(&ci->i_ceph_lock);
1598
1599 if (psession) {
1600 *psession = session;
1601 } else if (session) {
1602 mutex_unlock(&session->s_mutex);
1603 ceph_put_mds_session(session);
1604 }
1605 /* we flushed them all; remove this inode from the queue */
1606 spin_lock(&mdsc->snap_flush_lock);
1607 list_del_init(&ci->i_snap_flush_item);
1608 spin_unlock(&mdsc->snap_flush_lock);
1609}
1610
1611/*
1612 * Mark caps dirty. If inode is newly dirty, return the dirty flags.
1613 * Caller is then responsible for calling __mark_inode_dirty with the
1614 * returned flags value.
1615 */
1616int __ceph_mark_dirty_caps(struct ceph_inode_info *ci, int mask,
1617 struct ceph_cap_flush **pcf)
1618{
1619 struct ceph_mds_client *mdsc =
1620 ceph_sb_to_client(ci->vfs_inode.i_sb)->mdsc;
1621 struct inode *inode = &ci->vfs_inode;
1622 int was = ci->i_dirty_caps;
1623 int dirty = 0;
1624
1625 if (!ci->i_auth_cap) {
1626 pr_warn("__mark_dirty_caps %p %llx mask %s, "
1627 "but no auth cap (session was closed?)\n",
1628 inode, ceph_ino(inode), ceph_cap_string(mask));
1629 return 0;
1630 }
1631
1632 dout("__mark_dirty_caps %p %s dirty %s -> %s\n", &ci->vfs_inode,
1633 ceph_cap_string(mask), ceph_cap_string(was),
1634 ceph_cap_string(was | mask));
1635 ci->i_dirty_caps |= mask;
1636 if (was == 0) {
1637 WARN_ON_ONCE(ci->i_prealloc_cap_flush);
1638 swap(ci->i_prealloc_cap_flush, *pcf);
1639
1640 if (!ci->i_head_snapc) {
1641 WARN_ON_ONCE(!rwsem_is_locked(&mdsc->snap_rwsem));
1642 ci->i_head_snapc = ceph_get_snap_context(
1643 ci->i_snap_realm->cached_context);
1644 }
1645 dout(" inode %p now dirty snapc %p auth cap %p\n",
1646 &ci->vfs_inode, ci->i_head_snapc, ci->i_auth_cap);
1647 BUG_ON(!list_empty(&ci->i_dirty_item));
1648 spin_lock(&mdsc->cap_dirty_lock);
1649 list_add(&ci->i_dirty_item, &mdsc->cap_dirty);
1650 spin_unlock(&mdsc->cap_dirty_lock);
1651 if (ci->i_flushing_caps == 0) {
1652 ihold(inode);
1653 dirty |= I_DIRTY_SYNC;
1654 }
1655 } else {
1656 WARN_ON_ONCE(!ci->i_prealloc_cap_flush);
1657 }
1658 BUG_ON(list_empty(&ci->i_dirty_item));
1659 if (((was | ci->i_flushing_caps) & CEPH_CAP_FILE_BUFFER) &&
1660 (mask & CEPH_CAP_FILE_BUFFER))
1661 dirty |= I_DIRTY_DATASYNC;
1662 __cap_delay_requeue(mdsc, ci);
1663 return dirty;
1664}
1665
1666struct ceph_cap_flush *ceph_alloc_cap_flush(void)
1667{
1668 return kmem_cache_alloc(ceph_cap_flush_cachep, GFP_KERNEL);
1669}
1670
1671void ceph_free_cap_flush(struct ceph_cap_flush *cf)
1672{
1673 if (cf)
1674 kmem_cache_free(ceph_cap_flush_cachep, cf);
1675}
1676
1677static u64 __get_oldest_flush_tid(struct ceph_mds_client *mdsc)
1678{
1679 if (!list_empty(&mdsc->cap_flush_list)) {
1680 struct ceph_cap_flush *cf =
1681 list_first_entry(&mdsc->cap_flush_list,
1682 struct ceph_cap_flush, g_list);
1683 return cf->tid;
1684 }
1685 return 0;
1686}
1687
1688/*
1689 * Remove cap_flush from the mdsc's or inode's flushing cap list.
1690 * Return true if caller needs to wake up flush waiters.
1691 */
1692static bool __finish_cap_flush(struct ceph_mds_client *mdsc,
1693 struct ceph_inode_info *ci,
1694 struct ceph_cap_flush *cf)
1695{
1696 struct ceph_cap_flush *prev;
1697 bool wake = cf->wake;
1698 if (mdsc) {
1699 /* are there older pending cap flushes? */
1700 if (wake && cf->g_list.prev != &mdsc->cap_flush_list) {
1701 prev = list_prev_entry(cf, g_list);
1702 prev->wake = true;
1703 wake = false;
1704 }
1705 list_del(&cf->g_list);
1706 } else if (ci) {
1707 if (wake && cf->i_list.prev != &ci->i_cap_flush_list) {
1708 prev = list_prev_entry(cf, i_list);
1709 prev->wake = true;
1710 wake = false;
1711 }
1712 list_del(&cf->i_list);
1713 } else {
1714 BUG_ON(1);
1715 }
1716 return wake;
1717}
1718
1719/*
1720 * Add dirty inode to the flushing list. Assigned a seq number so we
1721 * can wait for caps to flush without starving.
1722 *
1723 * Called under i_ceph_lock.
1724 */
1725static int __mark_caps_flushing(struct inode *inode,
1726 struct ceph_mds_session *session, bool wake,
1727 u64 *flush_tid, u64 *oldest_flush_tid)
1728{
1729 struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
1730 struct ceph_inode_info *ci = ceph_inode(inode);
1731 struct ceph_cap_flush *cf = NULL;
1732 int flushing;
1733
1734 BUG_ON(ci->i_dirty_caps == 0);
1735 BUG_ON(list_empty(&ci->i_dirty_item));
1736 BUG_ON(!ci->i_prealloc_cap_flush);
1737
1738 flushing = ci->i_dirty_caps;
1739 dout("__mark_caps_flushing flushing %s, flushing_caps %s -> %s\n",
1740 ceph_cap_string(flushing),
1741 ceph_cap_string(ci->i_flushing_caps),
1742 ceph_cap_string(ci->i_flushing_caps | flushing));
1743 ci->i_flushing_caps |= flushing;
1744 ci->i_dirty_caps = 0;
1745 dout(" inode %p now !dirty\n", inode);
1746
1747 swap(cf, ci->i_prealloc_cap_flush);
1748 cf->caps = flushing;
1749 cf->wake = wake;
1750
1751 spin_lock(&mdsc->cap_dirty_lock);
1752 list_del_init(&ci->i_dirty_item);
1753
1754 cf->tid = ++mdsc->last_cap_flush_tid;
1755 list_add_tail(&cf->g_list, &mdsc->cap_flush_list);
1756 *oldest_flush_tid = __get_oldest_flush_tid(mdsc);
1757
1758 if (list_empty(&ci->i_flushing_item)) {
1759 list_add_tail(&ci->i_flushing_item, &session->s_cap_flushing);
1760 mdsc->num_cap_flushing++;
1761 }
1762 spin_unlock(&mdsc->cap_dirty_lock);
1763
1764 list_add_tail(&cf->i_list, &ci->i_cap_flush_list);
1765
1766 *flush_tid = cf->tid;
1767 return flushing;
1768}
1769
1770/*
1771 * try to invalidate mapping pages without blocking.
1772 */
1773static int try_nonblocking_invalidate(struct inode *inode)
1774{
1775 struct ceph_inode_info *ci = ceph_inode(inode);
1776 u32 invalidating_gen = ci->i_rdcache_gen;
1777
1778 spin_unlock(&ci->i_ceph_lock);
1779 invalidate_mapping_pages(&inode->i_data, 0, -1);
1780 spin_lock(&ci->i_ceph_lock);
1781
1782 if (inode->i_data.nrpages == 0 &&
1783 invalidating_gen == ci->i_rdcache_gen) {
1784 /* success. */
1785 dout("try_nonblocking_invalidate %p success\n", inode);
1786 /* save any racing async invalidate some trouble */
1787 ci->i_rdcache_revoking = ci->i_rdcache_gen - 1;
1788 return 0;
1789 }
1790 dout("try_nonblocking_invalidate %p failed\n", inode);
1791 return -1;
1792}
1793
1794bool __ceph_should_report_size(struct ceph_inode_info *ci)
1795{
1796 loff_t size = ci->vfs_inode.i_size;
1797 /* mds will adjust max size according to the reported size */
1798 if (ci->i_flushing_caps & CEPH_CAP_FILE_WR)
1799 return false;
1800 if (size >= ci->i_max_size)
1801 return true;
1802 /* half of previous max_size increment has been used */
1803 if (ci->i_max_size > ci->i_reported_size &&
1804 (size << 1) >= ci->i_max_size + ci->i_reported_size)
1805 return true;
1806 return false;
1807}
1808
1809/*
1810 * Swiss army knife function to examine currently used and wanted
1811 * versus held caps. Release, flush, ack revoked caps to mds as
1812 * appropriate.
1813 *
1814 * CHECK_CAPS_NODELAY - caller is delayed work and we should not delay
1815 * cap release further.
1816 * CHECK_CAPS_AUTHONLY - we should only check the auth cap
1817 * CHECK_CAPS_FLUSH - we should flush any dirty caps immediately, without
1818 * further delay.
1819 */
1820void ceph_check_caps(struct ceph_inode_info *ci, int flags,
1821 struct ceph_mds_session *session)
1822{
1823 struct ceph_fs_client *fsc = ceph_inode_to_client(&ci->vfs_inode);
1824 struct ceph_mds_client *mdsc = fsc->mdsc;
1825 struct inode *inode = &ci->vfs_inode;
1826 struct ceph_cap *cap;
1827 u64 flush_tid, oldest_flush_tid;
1828 int file_wanted, used, cap_used;
1829 int took_snap_rwsem = 0; /* true if mdsc->snap_rwsem held */
1830 int issued, implemented, want, retain, revoking, flushing = 0;
1831 int mds = -1; /* keep track of how far we've gone through i_caps list
1832 to avoid an infinite loop on retry */
1833 struct rb_node *p;
1834 int delayed = 0, sent = 0;
1835 bool no_delay = flags & CHECK_CAPS_NODELAY;
1836 bool queue_invalidate = false;
1837 bool tried_invalidate = false;
1838
1839 /* if we are unmounting, flush any unused caps immediately. */
1840 if (mdsc->stopping)
1841 no_delay = true;
1842
1843 spin_lock(&ci->i_ceph_lock);
1844
1845 if (ci->i_ceph_flags & CEPH_I_FLUSH)
1846 flags |= CHECK_CAPS_FLUSH;
1847
1848 if (!(flags & CHECK_CAPS_AUTHONLY) ||
1849 (ci->i_auth_cap && __ceph_is_single_caps(ci)))
1850 __cap_delay_cancel(mdsc, ci);
1851
1852 goto retry_locked;
1853retry:
1854 spin_lock(&ci->i_ceph_lock);
1855retry_locked:
1856 file_wanted = __ceph_caps_file_wanted(ci);
1857 used = __ceph_caps_used(ci);
1858 issued = __ceph_caps_issued(ci, &implemented);
1859 revoking = implemented & ~issued;
1860
1861 want = file_wanted;
1862 retain = file_wanted | used | CEPH_CAP_PIN;
1863 if (!mdsc->stopping && inode->i_nlink > 0) {
1864 if (file_wanted) {
1865 retain |= CEPH_CAP_ANY; /* be greedy */
1866 } else if (S_ISDIR(inode->i_mode) &&
1867 (issued & CEPH_CAP_FILE_SHARED) &&
1868 __ceph_dir_is_complete(ci)) {
1869 /*
1870 * If a directory is complete, we want to keep
1871 * the exclusive cap. So that MDS does not end up
1872 * revoking the shared cap on every create/unlink
1873 * operation.
1874 */
1875 want = CEPH_CAP_ANY_SHARED | CEPH_CAP_FILE_EXCL;
1876 retain |= want;
1877 } else {
1878
1879 retain |= CEPH_CAP_ANY_SHARED;
1880 /*
1881 * keep RD only if we didn't have the file open RW,
1882 * because then the mds would revoke it anyway to
1883 * journal max_size=0.
1884 */
1885 if (ci->i_max_size == 0)
1886 retain |= CEPH_CAP_ANY_RD;
1887 }
1888 }
1889
1890 dout("check_caps %p file_want %s used %s dirty %s flushing %s"
1891 " issued %s revoking %s retain %s %s%s%s\n", inode,
1892 ceph_cap_string(file_wanted),
1893 ceph_cap_string(used), ceph_cap_string(ci->i_dirty_caps),
1894 ceph_cap_string(ci->i_flushing_caps),
1895 ceph_cap_string(issued), ceph_cap_string(revoking),
1896 ceph_cap_string(retain),
1897 (flags & CHECK_CAPS_AUTHONLY) ? " AUTHONLY" : "",
1898 (flags & CHECK_CAPS_NODELAY) ? " NODELAY" : "",
1899 (flags & CHECK_CAPS_FLUSH) ? " FLUSH" : "");
1900
1901 /*
1902 * If we no longer need to hold onto old our caps, and we may
1903 * have cached pages, but don't want them, then try to invalidate.
1904 * If we fail, it's because pages are locked.... try again later.
1905 */
1906 if ((!no_delay || mdsc->stopping) &&
1907 !S_ISDIR(inode->i_mode) && /* ignore readdir cache */
1908 !(ci->i_wb_ref || ci->i_wrbuffer_ref) && /* no dirty pages... */
1909 inode->i_data.nrpages && /* have cached pages */
1910 (revoking & (CEPH_CAP_FILE_CACHE|
1911 CEPH_CAP_FILE_LAZYIO)) && /* or revoking cache */
1912 !tried_invalidate) {
1913 dout("check_caps trying to invalidate on %p\n", inode);
1914 if (try_nonblocking_invalidate(inode) < 0) {
1915 dout("check_caps queuing invalidate\n");
1916 queue_invalidate = true;
1917 ci->i_rdcache_revoking = ci->i_rdcache_gen;
1918 }
1919 tried_invalidate = true;
1920 goto retry_locked;
1921 }
1922
1923 for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
1924 cap = rb_entry(p, struct ceph_cap, ci_node);
1925
1926 /* avoid looping forever */
1927 if (mds >= cap->mds ||
1928 ((flags & CHECK_CAPS_AUTHONLY) && cap != ci->i_auth_cap))
1929 continue;
1930
1931 /* NOTE: no side-effects allowed, until we take s_mutex */
1932
1933 cap_used = used;
1934 if (ci->i_auth_cap && cap != ci->i_auth_cap)
1935 cap_used &= ~ci->i_auth_cap->issued;
1936
1937 revoking = cap->implemented & ~cap->issued;
1938 dout(" mds%d cap %p used %s issued %s implemented %s revoking %s\n",
1939 cap->mds, cap, ceph_cap_string(cap_used),
1940 ceph_cap_string(cap->issued),
1941 ceph_cap_string(cap->implemented),
1942 ceph_cap_string(revoking));
1943
1944 if (cap == ci->i_auth_cap &&
1945 (cap->issued & CEPH_CAP_FILE_WR)) {
1946 /* request larger max_size from MDS? */
1947 if (ci->i_wanted_max_size > ci->i_max_size &&
1948 ci->i_wanted_max_size > ci->i_requested_max_size) {
1949 dout("requesting new max_size\n");
1950 goto ack;
1951 }
1952
1953 /* approaching file_max? */
1954 if (__ceph_should_report_size(ci)) {
1955 dout("i_size approaching max_size\n");
1956 goto ack;
1957 }
1958 }
1959 /* flush anything dirty? */
1960 if (cap == ci->i_auth_cap) {
1961 if ((flags & CHECK_CAPS_FLUSH) && ci->i_dirty_caps) {
1962 dout("flushing dirty caps\n");
1963 goto ack;
1964 }
1965 if (ci->i_ceph_flags & CEPH_I_FLUSH_SNAPS) {
1966 dout("flushing snap caps\n");
1967 goto ack;
1968 }
1969 }
1970
1971 /* completed revocation? going down and there are no caps? */
1972 if (revoking && (revoking & cap_used) == 0) {
1973 dout("completed revocation of %s\n",
1974 ceph_cap_string(cap->implemented & ~cap->issued));
1975 goto ack;
1976 }
1977
1978 /* want more caps from mds? */
1979 if (want & ~(cap->mds_wanted | cap->issued))
1980 goto ack;
1981
1982 /* things we might delay */
1983 if ((cap->issued & ~retain) == 0 &&
1984 cap->mds_wanted == want)
1985 continue; /* nope, all good */
1986
1987 if (no_delay)
1988 goto ack;
1989
1990 /* delay? */
1991 if ((ci->i_ceph_flags & CEPH_I_NODELAY) == 0 &&
1992 time_before(jiffies, ci->i_hold_caps_max)) {
1993 dout(" delaying issued %s -> %s, wanted %s -> %s\n",
1994 ceph_cap_string(cap->issued),
1995 ceph_cap_string(cap->issued & retain),
1996 ceph_cap_string(cap->mds_wanted),
1997 ceph_cap_string(want));
1998 delayed++;
1999 continue;
2000 }
2001
2002ack:
2003 if (ci->i_ceph_flags & CEPH_I_NOFLUSH) {
2004 dout(" skipping %p I_NOFLUSH set\n", inode);
2005 continue;
2006 }
2007
2008 if (session && session != cap->session) {
2009 dout("oops, wrong session %p mutex\n", session);
2010 mutex_unlock(&session->s_mutex);
2011 session = NULL;
2012 }
2013 if (!session) {
2014 session = cap->session;
2015 if (mutex_trylock(&session->s_mutex) == 0) {
2016 dout("inverting session/ino locks on %p\n",
2017 session);
2018 spin_unlock(&ci->i_ceph_lock);
2019 if (took_snap_rwsem) {
2020 up_read(&mdsc->snap_rwsem);
2021 took_snap_rwsem = 0;
2022 }
2023 mutex_lock(&session->s_mutex);
2024 goto retry;
2025 }
2026 }
2027
2028 /* kick flushing and flush snaps before sending normal
2029 * cap message */
2030 if (cap == ci->i_auth_cap &&
2031 (ci->i_ceph_flags &
2032 (CEPH_I_KICK_FLUSH | CEPH_I_FLUSH_SNAPS))) {
2033 if (ci->i_ceph_flags & CEPH_I_KICK_FLUSH) {
2034 __kick_flushing_caps(mdsc, session, ci, 0);
2035 ci->i_ceph_flags &= ~CEPH_I_KICK_FLUSH;
2036 }
2037 if (ci->i_ceph_flags & CEPH_I_FLUSH_SNAPS)
2038 __ceph_flush_snaps(ci, session);
2039
2040 goto retry_locked;
2041 }
2042
2043 /* take snap_rwsem after session mutex */
2044 if (!took_snap_rwsem) {
2045 if (down_read_trylock(&mdsc->snap_rwsem) == 0) {
2046 dout("inverting snap/in locks on %p\n",
2047 inode);
2048 spin_unlock(&ci->i_ceph_lock);
2049 down_read(&mdsc->snap_rwsem);
2050 took_snap_rwsem = 1;
2051 goto retry;
2052 }
2053 took_snap_rwsem = 1;
2054 }
2055
2056 if (cap == ci->i_auth_cap && ci->i_dirty_caps) {
2057 flushing = __mark_caps_flushing(inode, session, false,
2058 &flush_tid,
2059 &oldest_flush_tid);
2060 } else {
2061 flushing = 0;
2062 flush_tid = 0;
2063 spin_lock(&mdsc->cap_dirty_lock);
2064 oldest_flush_tid = __get_oldest_flush_tid(mdsc);
2065 spin_unlock(&mdsc->cap_dirty_lock);
2066 }
2067
2068 mds = cap->mds; /* remember mds, so we don't repeat */
2069 sent++;
2070
2071 /* __send_cap drops i_ceph_lock */
2072 delayed += __send_cap(mdsc, cap, CEPH_CAP_OP_UPDATE, false,
2073 cap_used, want, retain, flushing,
2074 flush_tid, oldest_flush_tid);
2075 goto retry; /* retake i_ceph_lock and restart our cap scan. */
2076 }
2077
2078 /* Reschedule delayed caps release if we delayed anything */
2079 if (delayed)
2080 __cap_delay_requeue(mdsc, ci);
2081
2082 spin_unlock(&ci->i_ceph_lock);
2083
2084 if (queue_invalidate)
2085 ceph_queue_invalidate(inode);
2086
2087 if (session)
2088 mutex_unlock(&session->s_mutex);
2089 if (took_snap_rwsem)
2090 up_read(&mdsc->snap_rwsem);
2091}
2092
2093/*
2094 * Try to flush dirty caps back to the auth mds.
2095 */
2096static int try_flush_caps(struct inode *inode, u64 *ptid)
2097{
2098 struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
2099 struct ceph_inode_info *ci = ceph_inode(inode);
2100 struct ceph_mds_session *session = NULL;
2101 int flushing = 0;
2102 u64 flush_tid = 0, oldest_flush_tid = 0;
2103
2104retry:
2105 spin_lock(&ci->i_ceph_lock);
2106 if (ci->i_ceph_flags & CEPH_I_NOFLUSH) {
2107 spin_unlock(&ci->i_ceph_lock);
2108 dout("try_flush_caps skipping %p I_NOFLUSH set\n", inode);
2109 goto out;
2110 }
2111 if (ci->i_dirty_caps && ci->i_auth_cap) {
2112 struct ceph_cap *cap = ci->i_auth_cap;
2113 int used = __ceph_caps_used(ci);
2114 int want = __ceph_caps_wanted(ci);
2115 int delayed;
2116
2117 if (!session || session != cap->session) {
2118 spin_unlock(&ci->i_ceph_lock);
2119 if (session)
2120 mutex_unlock(&session->s_mutex);
2121 session = cap->session;
2122 mutex_lock(&session->s_mutex);
2123 goto retry;
2124 }
2125 if (cap->session->s_state < CEPH_MDS_SESSION_OPEN) {
2126 spin_unlock(&ci->i_ceph_lock);
2127 goto out;
2128 }
2129
2130 flushing = __mark_caps_flushing(inode, session, true,
2131 &flush_tid, &oldest_flush_tid);
2132
2133 /* __send_cap drops i_ceph_lock */
2134 delayed = __send_cap(mdsc, cap, CEPH_CAP_OP_FLUSH, true,
2135 used, want, (cap->issued | cap->implemented),
2136 flushing, flush_tid, oldest_flush_tid);
2137
2138 if (delayed) {
2139 spin_lock(&ci->i_ceph_lock);
2140 __cap_delay_requeue(mdsc, ci);
2141 spin_unlock(&ci->i_ceph_lock);
2142 }
2143 } else {
2144 if (!list_empty(&ci->i_cap_flush_list)) {
2145 struct ceph_cap_flush *cf =
2146 list_last_entry(&ci->i_cap_flush_list,
2147 struct ceph_cap_flush, i_list);
2148 cf->wake = true;
2149 flush_tid = cf->tid;
2150 }
2151 flushing = ci->i_flushing_caps;
2152 spin_unlock(&ci->i_ceph_lock);
2153 }
2154out:
2155 if (session)
2156 mutex_unlock(&session->s_mutex);
2157
2158 *ptid = flush_tid;
2159 return flushing;
2160}
2161
2162/*
2163 * Return true if we've flushed caps through the given flush_tid.
2164 */
2165static int caps_are_flushed(struct inode *inode, u64 flush_tid)
2166{
2167 struct ceph_inode_info *ci = ceph_inode(inode);
2168 int ret = 1;
2169
2170 spin_lock(&ci->i_ceph_lock);
2171 if (!list_empty(&ci->i_cap_flush_list)) {
2172 struct ceph_cap_flush * cf =
2173 list_first_entry(&ci->i_cap_flush_list,
2174 struct ceph_cap_flush, i_list);
2175 if (cf->tid <= flush_tid)
2176 ret = 0;
2177 }
2178 spin_unlock(&ci->i_ceph_lock);
2179 return ret;
2180}
2181
2182/*
2183 * wait for any unsafe requests to complete.
2184 */
2185static int unsafe_request_wait(struct inode *inode)
2186{
2187 struct ceph_inode_info *ci = ceph_inode(inode);
2188 struct ceph_mds_request *req1 = NULL, *req2 = NULL;
2189 int ret, err = 0;
2190
2191 spin_lock(&ci->i_unsafe_lock);
2192 if (S_ISDIR(inode->i_mode) && !list_empty(&ci->i_unsafe_dirops)) {
2193 req1 = list_last_entry(&ci->i_unsafe_dirops,
2194 struct ceph_mds_request,
2195 r_unsafe_dir_item);
2196 ceph_mdsc_get_request(req1);
2197 }
2198 if (!list_empty(&ci->i_unsafe_iops)) {
2199 req2 = list_last_entry(&ci->i_unsafe_iops,
2200 struct ceph_mds_request,
2201 r_unsafe_target_item);
2202 ceph_mdsc_get_request(req2);
2203 }
2204 spin_unlock(&ci->i_unsafe_lock);
2205
2206 dout("unsafe_request_wait %p wait on tid %llu %llu\n",
2207 inode, req1 ? req1->r_tid : 0ULL, req2 ? req2->r_tid : 0ULL);
2208 if (req1) {
2209 ret = !wait_for_completion_timeout(&req1->r_safe_completion,
2210 ceph_timeout_jiffies(req1->r_timeout));
2211 if (ret)
2212 err = -EIO;
2213 ceph_mdsc_put_request(req1);
2214 }
2215 if (req2) {
2216 ret = !wait_for_completion_timeout(&req2->r_safe_completion,
2217 ceph_timeout_jiffies(req2->r_timeout));
2218 if (ret)
2219 err = -EIO;
2220 ceph_mdsc_put_request(req2);
2221 }
2222 return err;
2223}
2224
2225int ceph_fsync(struct file *file, loff_t start, loff_t end, int datasync)
2226{
2227 struct inode *inode = file->f_mapping->host;
2228 struct ceph_inode_info *ci = ceph_inode(inode);
2229 u64 flush_tid;
2230 int ret;
2231 int dirty;
2232
2233 dout("fsync %p%s\n", inode, datasync ? " datasync" : "");
2234
2235 ret = file_write_and_wait_range(file, start, end);
2236 if (ret < 0)
2237 goto out;
2238
2239 if (datasync)
2240 goto out;
2241
2242 inode_lock(inode);
2243
2244 dirty = try_flush_caps(inode, &flush_tid);
2245 dout("fsync dirty caps are %s\n", ceph_cap_string(dirty));
2246
2247 ret = unsafe_request_wait(inode);
2248
2249 /*
2250 * only wait on non-file metadata writeback (the mds
2251 * can recover size and mtime, so we don't need to
2252 * wait for that)
2253 */
2254 if (!ret && (dirty & ~CEPH_CAP_ANY_FILE_WR)) {
2255 ret = wait_event_interruptible(ci->i_cap_wq,
2256 caps_are_flushed(inode, flush_tid));
2257 }
2258 inode_unlock(inode);
2259out:
2260 dout("fsync %p%s result=%d\n", inode, datasync ? " datasync" : "", ret);
2261 return ret;
2262}
2263
2264/*
2265 * Flush any dirty caps back to the mds. If we aren't asked to wait,
2266 * queue inode for flush but don't do so immediately, because we can
2267 * get by with fewer MDS messages if we wait for data writeback to
2268 * complete first.
2269 */
2270int ceph_write_inode(struct inode *inode, struct writeback_control *wbc)
2271{
2272 struct ceph_inode_info *ci = ceph_inode(inode);
2273 u64 flush_tid;
2274 int err = 0;
2275 int dirty;
2276 int wait = (wbc->sync_mode == WB_SYNC_ALL && !wbc->for_sync);
2277
2278 dout("write_inode %p wait=%d\n", inode, wait);
2279 if (wait) {
2280 dirty = try_flush_caps(inode, &flush_tid);
2281 if (dirty)
2282 err = wait_event_interruptible(ci->i_cap_wq,
2283 caps_are_flushed(inode, flush_tid));
2284 } else {
2285 struct ceph_mds_client *mdsc =
2286 ceph_sb_to_client(inode->i_sb)->mdsc;
2287
2288 spin_lock(&ci->i_ceph_lock);
2289 if (__ceph_caps_dirty(ci))
2290 __cap_delay_requeue_front(mdsc, ci);
2291 spin_unlock(&ci->i_ceph_lock);
2292 }
2293 return err;
2294}
2295
2296static void __kick_flushing_caps(struct ceph_mds_client *mdsc,
2297 struct ceph_mds_session *session,
2298 struct ceph_inode_info *ci,
2299 u64 oldest_flush_tid)
2300 __releases(ci->i_ceph_lock)
2301 __acquires(ci->i_ceph_lock)
2302{
2303 struct inode *inode = &ci->vfs_inode;
2304 struct ceph_cap *cap;
2305 struct ceph_cap_flush *cf;
2306 int ret;
2307 u64 first_tid = 0;
2308
2309 list_for_each_entry(cf, &ci->i_cap_flush_list, i_list) {
2310 if (cf->tid < first_tid)
2311 continue;
2312
2313 cap = ci->i_auth_cap;
2314 if (!(cap && cap->session == session)) {
2315 pr_err("%p auth cap %p not mds%d ???\n",
2316 inode, cap, session->s_mds);
2317 break;
2318 }
2319
2320 first_tid = cf->tid + 1;
2321
2322 if (cf->caps) {
2323 dout("kick_flushing_caps %p cap %p tid %llu %s\n",
2324 inode, cap, cf->tid, ceph_cap_string(cf->caps));
2325 ci->i_ceph_flags |= CEPH_I_NODELAY;
2326 ret = __send_cap(mdsc, cap, CEPH_CAP_OP_FLUSH,
2327 false, __ceph_caps_used(ci),
2328 __ceph_caps_wanted(ci),
2329 cap->issued | cap->implemented,
2330 cf->caps, cf->tid, oldest_flush_tid);
2331 if (ret) {
2332 pr_err("kick_flushing_caps: error sending "
2333 "cap flush, ino (%llx.%llx) "
2334 "tid %llu flushing %s\n",
2335 ceph_vinop(inode), cf->tid,
2336 ceph_cap_string(cf->caps));
2337 }
2338 } else {
2339 struct ceph_cap_snap *capsnap =
2340 container_of(cf, struct ceph_cap_snap,
2341 cap_flush);
2342 dout("kick_flushing_caps %p capsnap %p tid %llu %s\n",
2343 inode, capsnap, cf->tid,
2344 ceph_cap_string(capsnap->dirty));
2345
2346 refcount_inc(&capsnap->nref);
2347 spin_unlock(&ci->i_ceph_lock);
2348
2349 ret = __send_flush_snap(inode, session, capsnap, cap->mseq,
2350 oldest_flush_tid);
2351 if (ret < 0) {
2352 pr_err("kick_flushing_caps: error sending "
2353 "cap flushsnap, ino (%llx.%llx) "
2354 "tid %llu follows %llu\n",
2355 ceph_vinop(inode), cf->tid,
2356 capsnap->follows);
2357 }
2358
2359 ceph_put_cap_snap(capsnap);
2360 }
2361
2362 spin_lock(&ci->i_ceph_lock);
2363 }
2364}
2365
2366void ceph_early_kick_flushing_caps(struct ceph_mds_client *mdsc,
2367 struct ceph_mds_session *session)
2368{
2369 struct ceph_inode_info *ci;
2370 struct ceph_cap *cap;
2371 u64 oldest_flush_tid;
2372
2373 dout("early_kick_flushing_caps mds%d\n", session->s_mds);
2374
2375 spin_lock(&mdsc->cap_dirty_lock);
2376 oldest_flush_tid = __get_oldest_flush_tid(mdsc);
2377 spin_unlock(&mdsc->cap_dirty_lock);
2378
2379 list_for_each_entry(ci, &session->s_cap_flushing, i_flushing_item) {
2380 spin_lock(&ci->i_ceph_lock);
2381 cap = ci->i_auth_cap;
2382 if (!(cap && cap->session == session)) {
2383 pr_err("%p auth cap %p not mds%d ???\n",
2384 &ci->vfs_inode, cap, session->s_mds);
2385 spin_unlock(&ci->i_ceph_lock);
2386 continue;
2387 }
2388
2389
2390 /*
2391 * if flushing caps were revoked, we re-send the cap flush
2392 * in client reconnect stage. This guarantees MDS * processes
2393 * the cap flush message before issuing the flushing caps to
2394 * other client.
2395 */
2396 if ((cap->issued & ci->i_flushing_caps) !=
2397 ci->i_flushing_caps) {
2398 ci->i_ceph_flags &= ~CEPH_I_KICK_FLUSH;
2399 __kick_flushing_caps(mdsc, session, ci,
2400 oldest_flush_tid);
2401 } else {
2402 ci->i_ceph_flags |= CEPH_I_KICK_FLUSH;
2403 }
2404
2405 spin_unlock(&ci->i_ceph_lock);
2406 }
2407}
2408
2409void ceph_kick_flushing_caps(struct ceph_mds_client *mdsc,
2410 struct ceph_mds_session *session)
2411{
2412 struct ceph_inode_info *ci;
2413 struct ceph_cap *cap;
2414 u64 oldest_flush_tid;
2415
2416 dout("kick_flushing_caps mds%d\n", session->s_mds);
2417
2418 spin_lock(&mdsc->cap_dirty_lock);
2419 oldest_flush_tid = __get_oldest_flush_tid(mdsc);
2420 spin_unlock(&mdsc->cap_dirty_lock);
2421
2422 list_for_each_entry(ci, &session->s_cap_flushing, i_flushing_item) {
2423 spin_lock(&ci->i_ceph_lock);
2424 cap = ci->i_auth_cap;
2425 if (!(cap && cap->session == session)) {
2426 pr_err("%p auth cap %p not mds%d ???\n",
2427 &ci->vfs_inode, cap, session->s_mds);
2428 spin_unlock(&ci->i_ceph_lock);
2429 continue;
2430 }
2431 if (ci->i_ceph_flags & CEPH_I_KICK_FLUSH) {
2432 ci->i_ceph_flags &= ~CEPH_I_KICK_FLUSH;
2433 __kick_flushing_caps(mdsc, session, ci,
2434 oldest_flush_tid);
2435 }
2436 spin_unlock(&ci->i_ceph_lock);
2437 }
2438}
2439
2440static void kick_flushing_inode_caps(struct ceph_mds_client *mdsc,
2441 struct ceph_mds_session *session,
2442 struct inode *inode)
2443 __releases(ci->i_ceph_lock)
2444{
2445 struct ceph_inode_info *ci = ceph_inode(inode);
2446 struct ceph_cap *cap;
2447
2448 cap = ci->i_auth_cap;
2449 dout("kick_flushing_inode_caps %p flushing %s\n", inode,
2450 ceph_cap_string(ci->i_flushing_caps));
2451
2452 if (!list_empty(&ci->i_cap_flush_list)) {
2453 u64 oldest_flush_tid;
2454 spin_lock(&mdsc->cap_dirty_lock);
2455 list_move_tail(&ci->i_flushing_item,
2456 &cap->session->s_cap_flushing);
2457 oldest_flush_tid = __get_oldest_flush_tid(mdsc);
2458 spin_unlock(&mdsc->cap_dirty_lock);
2459
2460 ci->i_ceph_flags &= ~CEPH_I_KICK_FLUSH;
2461 __kick_flushing_caps(mdsc, session, ci, oldest_flush_tid);
2462 spin_unlock(&ci->i_ceph_lock);
2463 } else {
2464 spin_unlock(&ci->i_ceph_lock);
2465 }
2466}
2467
2468
2469/*
2470 * Take references to capabilities we hold, so that we don't release
2471 * them to the MDS prematurely.
2472 *
2473 * Protected by i_ceph_lock.
2474 */
2475static void __take_cap_refs(struct ceph_inode_info *ci, int got,
2476 bool snap_rwsem_locked)
2477{
2478 if (got & CEPH_CAP_PIN)
2479 ci->i_pin_ref++;
2480 if (got & CEPH_CAP_FILE_RD)
2481 ci->i_rd_ref++;
2482 if (got & CEPH_CAP_FILE_CACHE)
2483 ci->i_rdcache_ref++;
2484 if (got & CEPH_CAP_FILE_WR) {
2485 if (ci->i_wr_ref == 0 && !ci->i_head_snapc) {
2486 BUG_ON(!snap_rwsem_locked);
2487 ci->i_head_snapc = ceph_get_snap_context(
2488 ci->i_snap_realm->cached_context);
2489 }
2490 ci->i_wr_ref++;
2491 }
2492 if (got & CEPH_CAP_FILE_BUFFER) {
2493 if (ci->i_wb_ref == 0)
2494 ihold(&ci->vfs_inode);
2495 ci->i_wb_ref++;
2496 dout("__take_cap_refs %p wb %d -> %d (?)\n",
2497 &ci->vfs_inode, ci->i_wb_ref-1, ci->i_wb_ref);
2498 }
2499}
2500
2501/*
2502 * Try to grab cap references. Specify those refs we @want, and the
2503 * minimal set we @need. Also include the larger offset we are writing
2504 * to (when applicable), and check against max_size here as well.
2505 * Note that caller is responsible for ensuring max_size increases are
2506 * requested from the MDS.
2507 */
2508static int try_get_cap_refs(struct ceph_inode_info *ci, int need, int want,
2509 loff_t endoff, bool nonblock, int *got, int *err)
2510{
2511 struct inode *inode = &ci->vfs_inode;
2512 struct ceph_mds_client *mdsc = ceph_inode_to_client(inode)->mdsc;
2513 int ret = 0;
2514 int have, implemented;
2515 int file_wanted;
2516 bool snap_rwsem_locked = false;
2517
2518 dout("get_cap_refs %p need %s want %s\n", inode,
2519 ceph_cap_string(need), ceph_cap_string(want));
2520
2521again:
2522 spin_lock(&ci->i_ceph_lock);
2523
2524 /* make sure file is actually open */
2525 file_wanted = __ceph_caps_file_wanted(ci);
2526 if ((file_wanted & need) != need) {
2527 dout("try_get_cap_refs need %s file_wanted %s, EBADF\n",
2528 ceph_cap_string(need), ceph_cap_string(file_wanted));
2529 *err = -EBADF;
2530 ret = 1;
2531 goto out_unlock;
2532 }
2533
2534 /* finish pending truncate */
2535 while (ci->i_truncate_pending) {
2536 spin_unlock(&ci->i_ceph_lock);
2537 if (snap_rwsem_locked) {
2538 up_read(&mdsc->snap_rwsem);
2539 snap_rwsem_locked = false;
2540 }
2541 __ceph_do_pending_vmtruncate(inode);
2542 spin_lock(&ci->i_ceph_lock);
2543 }
2544
2545 have = __ceph_caps_issued(ci, &implemented);
2546
2547 if (have & need & CEPH_CAP_FILE_WR) {
2548 if (endoff >= 0 && endoff > (loff_t)ci->i_max_size) {
2549 dout("get_cap_refs %p endoff %llu > maxsize %llu\n",
2550 inode, endoff, ci->i_max_size);
2551 if (endoff > ci->i_requested_max_size) {
2552 *err = -EAGAIN;
2553 ret = 1;
2554 }
2555 goto out_unlock;
2556 }
2557 /*
2558 * If a sync write is in progress, we must wait, so that we
2559 * can get a final snapshot value for size+mtime.
2560 */
2561 if (__ceph_have_pending_cap_snap(ci)) {
2562 dout("get_cap_refs %p cap_snap_pending\n", inode);
2563 goto out_unlock;
2564 }
2565 }
2566
2567 if ((have & need) == need) {
2568 /*
2569 * Look at (implemented & ~have & not) so that we keep waiting
2570 * on transition from wanted -> needed caps. This is needed
2571 * for WRBUFFER|WR -> WR to avoid a new WR sync write from
2572 * going before a prior buffered writeback happens.
2573 */
2574 int not = want & ~(have & need);
2575 int revoking = implemented & ~have;
2576 dout("get_cap_refs %p have %s but not %s (revoking %s)\n",
2577 inode, ceph_cap_string(have), ceph_cap_string(not),
2578 ceph_cap_string(revoking));
2579 if ((revoking & not) == 0) {
2580 if (!snap_rwsem_locked &&
2581 !ci->i_head_snapc &&
2582 (need & CEPH_CAP_FILE_WR)) {
2583 if (!down_read_trylock(&mdsc->snap_rwsem)) {
2584 /*
2585 * we can not call down_read() when
2586 * task isn't in TASK_RUNNING state
2587 */
2588 if (nonblock) {
2589 *err = -EAGAIN;
2590 ret = 1;
2591 goto out_unlock;
2592 }
2593
2594 spin_unlock(&ci->i_ceph_lock);
2595 down_read(&mdsc->snap_rwsem);
2596 snap_rwsem_locked = true;
2597 goto again;
2598 }
2599 snap_rwsem_locked = true;
2600 }
2601 *got = need | (have & want);
2602 if ((need & CEPH_CAP_FILE_RD) &&
2603 !(*got & CEPH_CAP_FILE_CACHE))
2604 ceph_disable_fscache_readpage(ci);
2605 __take_cap_refs(ci, *got, true);
2606 ret = 1;
2607 }
2608 } else {
2609 int session_readonly = false;
2610 if ((need & CEPH_CAP_FILE_WR) && ci->i_auth_cap) {
2611 struct ceph_mds_session *s = ci->i_auth_cap->session;
2612 spin_lock(&s->s_cap_lock);
2613 session_readonly = s->s_readonly;
2614 spin_unlock(&s->s_cap_lock);
2615 }
2616 if (session_readonly) {
2617 dout("get_cap_refs %p needed %s but mds%d readonly\n",
2618 inode, ceph_cap_string(need), ci->i_auth_cap->mds);
2619 *err = -EROFS;
2620 ret = 1;
2621 goto out_unlock;
2622 }
2623
2624 if (ci->i_ceph_flags & CEPH_I_CAP_DROPPED) {
2625 int mds_wanted;
2626 if (READ_ONCE(mdsc->fsc->mount_state) ==
2627 CEPH_MOUNT_SHUTDOWN) {
2628 dout("get_cap_refs %p forced umount\n", inode);
2629 *err = -EIO;
2630 ret = 1;
2631 goto out_unlock;
2632 }
2633 mds_wanted = __ceph_caps_mds_wanted(ci, false);
2634 if (need & ~(mds_wanted & need)) {
2635 dout("get_cap_refs %p caps were dropped"
2636 " (session killed?)\n", inode);
2637 *err = -ESTALE;
2638 ret = 1;
2639 goto out_unlock;
2640 }
2641 if (!(file_wanted & ~mds_wanted))
2642 ci->i_ceph_flags &= ~CEPH_I_CAP_DROPPED;
2643 }
2644
2645 dout("get_cap_refs %p have %s needed %s\n", inode,
2646 ceph_cap_string(have), ceph_cap_string(need));
2647 }
2648out_unlock:
2649 spin_unlock(&ci->i_ceph_lock);
2650 if (snap_rwsem_locked)
2651 up_read(&mdsc->snap_rwsem);
2652
2653 dout("get_cap_refs %p ret %d got %s\n", inode,
2654 ret, ceph_cap_string(*got));
2655 return ret;
2656}
2657
2658/*
2659 * Check the offset we are writing up to against our current
2660 * max_size. If necessary, tell the MDS we want to write to
2661 * a larger offset.
2662 */
2663static void check_max_size(struct inode *inode, loff_t endoff)
2664{
2665 struct ceph_inode_info *ci = ceph_inode(inode);
2666 int check = 0;
2667
2668 /* do we need to explicitly request a larger max_size? */
2669 spin_lock(&ci->i_ceph_lock);
2670 if (endoff >= ci->i_max_size && endoff > ci->i_wanted_max_size) {
2671 dout("write %p at large endoff %llu, req max_size\n",
2672 inode, endoff);
2673 ci->i_wanted_max_size = endoff;
2674 }
2675 /* duplicate ceph_check_caps()'s logic */
2676 if (ci->i_auth_cap &&
2677 (ci->i_auth_cap->issued & CEPH_CAP_FILE_WR) &&
2678 ci->i_wanted_max_size > ci->i_max_size &&
2679 ci->i_wanted_max_size > ci->i_requested_max_size)
2680 check = 1;
2681 spin_unlock(&ci->i_ceph_lock);
2682 if (check)
2683 ceph_check_caps(ci, CHECK_CAPS_AUTHONLY, NULL);
2684}
2685
2686int ceph_try_get_caps(struct ceph_inode_info *ci, int need, int want, int *got)
2687{
2688 int ret, err = 0;
2689
2690 BUG_ON(need & ~CEPH_CAP_FILE_RD);
2691 BUG_ON(want & ~(CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO));
2692 ret = ceph_pool_perm_check(ci, need);
2693 if (ret < 0)
2694 return ret;
2695
2696 ret = try_get_cap_refs(ci, need, want, 0, true, got, &err);
2697 if (ret) {
2698 if (err == -EAGAIN) {
2699 ret = 0;
2700 } else if (err < 0) {
2701 ret = err;
2702 }
2703 }
2704 return ret;
2705}
2706
2707/*
2708 * Wait for caps, and take cap references. If we can't get a WR cap
2709 * due to a small max_size, make sure we check_max_size (and possibly
2710 * ask the mds) so we don't get hung up indefinitely.
2711 */
2712int ceph_get_caps(struct ceph_inode_info *ci, int need, int want,
2713 loff_t endoff, int *got, struct page **pinned_page)
2714{
2715 int _got, ret, err = 0;
2716
2717 ret = ceph_pool_perm_check(ci, need);
2718 if (ret < 0)
2719 return ret;
2720
2721 while (true) {
2722 if (endoff > 0)
2723 check_max_size(&ci->vfs_inode, endoff);
2724
2725 err = 0;
2726 _got = 0;
2727 ret = try_get_cap_refs(ci, need, want, endoff,
2728 false, &_got, &err);
2729 if (ret) {
2730 if (err == -EAGAIN)
2731 continue;
2732 if (err < 0)
2733 ret = err;
2734 } else {
2735 DEFINE_WAIT_FUNC(wait, woken_wake_function);
2736 add_wait_queue(&ci->i_cap_wq, &wait);
2737
2738 while (!try_get_cap_refs(ci, need, want, endoff,
2739 true, &_got, &err)) {
2740 if (signal_pending(current)) {
2741 ret = -ERESTARTSYS;
2742 break;
2743 }
2744 wait_woken(&wait, TASK_INTERRUPTIBLE, MAX_SCHEDULE_TIMEOUT);
2745 }
2746
2747 remove_wait_queue(&ci->i_cap_wq, &wait);
2748
2749 if (err == -EAGAIN)
2750 continue;
2751 if (err < 0)
2752 ret = err;
2753 }
2754 if (ret < 0) {
2755 if (err == -ESTALE) {
2756 /* session was killed, try renew caps */
2757 ret = ceph_renew_caps(&ci->vfs_inode);
2758 if (ret == 0)
2759 continue;
2760 }
2761 return ret;
2762 }
2763
2764 if (ci->i_inline_version != CEPH_INLINE_NONE &&
2765 (_got & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) &&
2766 i_size_read(&ci->vfs_inode) > 0) {
2767 struct page *page =
2768 find_get_page(ci->vfs_inode.i_mapping, 0);
2769 if (page) {
2770 if (PageUptodate(page)) {
2771 *pinned_page = page;
2772 break;
2773 }
2774 put_page(page);
2775 }
2776 /*
2777 * drop cap refs first because getattr while
2778 * holding * caps refs can cause deadlock.
2779 */
2780 ceph_put_cap_refs(ci, _got);
2781 _got = 0;
2782
2783 /*
2784 * getattr request will bring inline data into
2785 * page cache
2786 */
2787 ret = __ceph_do_getattr(&ci->vfs_inode, NULL,
2788 CEPH_STAT_CAP_INLINE_DATA,
2789 true);
2790 if (ret < 0)
2791 return ret;
2792 continue;
2793 }
2794 break;
2795 }
2796
2797 if ((_got & CEPH_CAP_FILE_RD) && (_got & CEPH_CAP_FILE_CACHE))
2798 ceph_fscache_revalidate_cookie(ci);
2799
2800 *got = _got;
2801 return 0;
2802}
2803
2804/*
2805 * Take cap refs. Caller must already know we hold at least one ref
2806 * on the caps in question or we don't know this is safe.
2807 */
2808void ceph_get_cap_refs(struct ceph_inode_info *ci, int caps)
2809{
2810 spin_lock(&ci->i_ceph_lock);
2811 __take_cap_refs(ci, caps, false);
2812 spin_unlock(&ci->i_ceph_lock);
2813}
2814
2815
2816/*
2817 * drop cap_snap that is not associated with any snapshot.
2818 * we don't need to send FLUSHSNAP message for it.
2819 */
2820static int ceph_try_drop_cap_snap(struct ceph_inode_info *ci,
2821 struct ceph_cap_snap *capsnap)
2822{
2823 if (!capsnap->need_flush &&
2824 !capsnap->writing && !capsnap->dirty_pages) {
2825 dout("dropping cap_snap %p follows %llu\n",
2826 capsnap, capsnap->follows);
2827 BUG_ON(capsnap->cap_flush.tid > 0);
2828 ceph_put_snap_context(capsnap->context);
2829 if (!list_is_last(&capsnap->ci_item, &ci->i_cap_snaps))
2830 ci->i_ceph_flags |= CEPH_I_FLUSH_SNAPS;
2831
2832 list_del(&capsnap->ci_item);
2833 ceph_put_cap_snap(capsnap);
2834 return 1;
2835 }
2836 return 0;
2837}
2838
2839/*
2840 * Release cap refs.
2841 *
2842 * If we released the last ref on any given cap, call ceph_check_caps
2843 * to release (or schedule a release).
2844 *
2845 * If we are releasing a WR cap (from a sync write), finalize any affected
2846 * cap_snap, and wake up any waiters.
2847 */
2848void ceph_put_cap_refs(struct ceph_inode_info *ci, int had)
2849{
2850 struct inode *inode = &ci->vfs_inode;
2851 int last = 0, put = 0, flushsnaps = 0, wake = 0;
2852
2853 spin_lock(&ci->i_ceph_lock);
2854 if (had & CEPH_CAP_PIN)
2855 --ci->i_pin_ref;
2856 if (had & CEPH_CAP_FILE_RD)
2857 if (--ci->i_rd_ref == 0)
2858 last++;
2859 if (had & CEPH_CAP_FILE_CACHE)
2860 if (--ci->i_rdcache_ref == 0)
2861 last++;
2862 if (had & CEPH_CAP_FILE_BUFFER) {
2863 if (--ci->i_wb_ref == 0) {
2864 last++;
2865 put++;
2866 }
2867 dout("put_cap_refs %p wb %d -> %d (?)\n",
2868 inode, ci->i_wb_ref+1, ci->i_wb_ref);
2869 }
2870 if (had & CEPH_CAP_FILE_WR)
2871 if (--ci->i_wr_ref == 0) {
2872 last++;
2873 if (__ceph_have_pending_cap_snap(ci)) {
2874 struct ceph_cap_snap *capsnap =
2875 list_last_entry(&ci->i_cap_snaps,
2876 struct ceph_cap_snap,
2877 ci_item);
2878 capsnap->writing = 0;
2879 if (ceph_try_drop_cap_snap(ci, capsnap))
2880 put++;
2881 else if (__ceph_finish_cap_snap(ci, capsnap))
2882 flushsnaps = 1;
2883 wake = 1;
2884 }
2885 if (ci->i_wrbuffer_ref_head == 0 &&
2886 ci->i_dirty_caps == 0 &&
2887 ci->i_flushing_caps == 0) {
2888 BUG_ON(!ci->i_head_snapc);
2889 ceph_put_snap_context(ci->i_head_snapc);
2890 ci->i_head_snapc = NULL;
2891 }
2892 /* see comment in __ceph_remove_cap() */
2893 if (!__ceph_is_any_caps(ci) && ci->i_snap_realm)
2894 drop_inode_snap_realm(ci);
2895 }
2896 spin_unlock(&ci->i_ceph_lock);
2897
2898 dout("put_cap_refs %p had %s%s%s\n", inode, ceph_cap_string(had),
2899 last ? " last" : "", put ? " put" : "");
2900
2901 if (last && !flushsnaps)
2902 ceph_check_caps(ci, 0, NULL);
2903 else if (flushsnaps)
2904 ceph_flush_snaps(ci, NULL);
2905 if (wake)
2906 wake_up_all(&ci->i_cap_wq);
2907 while (put-- > 0)
2908 iput(inode);
2909}
2910
2911/*
2912 * Release @nr WRBUFFER refs on dirty pages for the given @snapc snap
2913 * context. Adjust per-snap dirty page accounting as appropriate.
2914 * Once all dirty data for a cap_snap is flushed, flush snapped file
2915 * metadata back to the MDS. If we dropped the last ref, call
2916 * ceph_check_caps.
2917 */
2918void ceph_put_wrbuffer_cap_refs(struct ceph_inode_info *ci, int nr,
2919 struct ceph_snap_context *snapc)
2920{
2921 struct inode *inode = &ci->vfs_inode;
2922 struct ceph_cap_snap *capsnap = NULL;
2923 int put = 0;
2924 bool last = false;
2925 bool found = false;
2926 bool flush_snaps = false;
2927 bool complete_capsnap = false;
2928
2929 spin_lock(&ci->i_ceph_lock);
2930 ci->i_wrbuffer_ref -= nr;
2931 if (ci->i_wrbuffer_ref == 0) {
2932 last = true;
2933 put++;
2934 }
2935
2936 if (ci->i_head_snapc == snapc) {
2937 ci->i_wrbuffer_ref_head -= nr;
2938 if (ci->i_wrbuffer_ref_head == 0 &&
2939 ci->i_wr_ref == 0 &&
2940 ci->i_dirty_caps == 0 &&
2941 ci->i_flushing_caps == 0) {
2942 BUG_ON(!ci->i_head_snapc);
2943 ceph_put_snap_context(ci->i_head_snapc);
2944 ci->i_head_snapc = NULL;
2945 }
2946 dout("put_wrbuffer_cap_refs on %p head %d/%d -> %d/%d %s\n",
2947 inode,
2948 ci->i_wrbuffer_ref+nr, ci->i_wrbuffer_ref_head+nr,
2949 ci->i_wrbuffer_ref, ci->i_wrbuffer_ref_head,
2950 last ? " LAST" : "");
2951 } else {
2952 list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) {
2953 if (capsnap->context == snapc) {
2954 found = true;
2955 break;
2956 }
2957 }
2958 BUG_ON(!found);
2959 capsnap->dirty_pages -= nr;
2960 if (capsnap->dirty_pages == 0) {
2961 complete_capsnap = true;
2962 if (!capsnap->writing) {
2963 if (ceph_try_drop_cap_snap(ci, capsnap)) {
2964 put++;
2965 } else {
2966 ci->i_ceph_flags |= CEPH_I_FLUSH_SNAPS;
2967 flush_snaps = true;
2968 }
2969 }
2970 }
2971 dout("put_wrbuffer_cap_refs on %p cap_snap %p "
2972 " snap %lld %d/%d -> %d/%d %s%s\n",
2973 inode, capsnap, capsnap->context->seq,
2974 ci->i_wrbuffer_ref+nr, capsnap->dirty_pages + nr,
2975 ci->i_wrbuffer_ref, capsnap->dirty_pages,
2976 last ? " (wrbuffer last)" : "",
2977 complete_capsnap ? " (complete capsnap)" : "");
2978 }
2979
2980 spin_unlock(&ci->i_ceph_lock);
2981
2982 if (last) {
2983 ceph_check_caps(ci, CHECK_CAPS_AUTHONLY, NULL);
2984 } else if (flush_snaps) {
2985 ceph_flush_snaps(ci, NULL);
2986 }
2987 if (complete_capsnap)
2988 wake_up_all(&ci->i_cap_wq);
2989 while (put-- > 0)
2990 iput(inode);
2991}
2992
2993/*
2994 * Invalidate unlinked inode's aliases, so we can drop the inode ASAP.
2995 */
2996static void invalidate_aliases(struct inode *inode)
2997{
2998 struct dentry *dn, *prev = NULL;
2999
3000 dout("invalidate_aliases inode %p\n", inode);
3001 d_prune_aliases(inode);
3002 /*
3003 * For non-directory inode, d_find_alias() only returns
3004 * hashed dentry. After calling d_invalidate(), the
3005 * dentry becomes unhashed.
3006 *
3007 * For directory inode, d_find_alias() can return
3008 * unhashed dentry. But directory inode should have
3009 * one alias at most.
3010 */
3011 while ((dn = d_find_alias(inode))) {
3012 if (dn == prev) {
3013 dput(dn);
3014 break;
3015 }
3016 d_invalidate(dn);
3017 if (prev)
3018 dput(prev);
3019 prev = dn;
3020 }
3021 if (prev)
3022 dput(prev);
3023}
3024
3025/*
3026 * Handle a cap GRANT message from the MDS. (Note that a GRANT may
3027 * actually be a revocation if it specifies a smaller cap set.)
3028 *
3029 * caller holds s_mutex and i_ceph_lock, we drop both.
3030 */
3031static void handle_cap_grant(struct ceph_mds_client *mdsc,
3032 struct inode *inode, struct ceph_mds_caps *grant,
3033 struct ceph_string **pns, u64 inline_version,
3034 void *inline_data, u32 inline_len,
3035 struct ceph_buffer *xattr_buf,
3036 struct ceph_mds_session *session,
3037 struct ceph_cap *cap, int issued)
3038 __releases(ci->i_ceph_lock)
3039 __releases(mdsc->snap_rwsem)
3040{
3041 struct ceph_inode_info *ci = ceph_inode(inode);
3042 int mds = session->s_mds;
3043 int seq = le32_to_cpu(grant->seq);
3044 int newcaps = le32_to_cpu(grant->caps);
3045 int used, wanted, dirty;
3046 u64 size = le64_to_cpu(grant->size);
3047 u64 max_size = le64_to_cpu(grant->max_size);
3048 struct timespec mtime, atime, ctime;
3049 int check_caps = 0;
3050 bool wake = false;
3051 bool writeback = false;
3052 bool queue_trunc = false;
3053 bool queue_invalidate = false;
3054 bool deleted_inode = false;
3055 bool fill_inline = false;
3056
3057 dout("handle_cap_grant inode %p cap %p mds%d seq %d %s\n",
3058 inode, cap, mds, seq, ceph_cap_string(newcaps));
3059 dout(" size %llu max_size %llu, i_size %llu\n", size, max_size,
3060 inode->i_size);
3061
3062
3063 /*
3064 * auth mds of the inode changed. we received the cap export message,
3065 * but still haven't received the cap import message. handle_cap_export
3066 * updated the new auth MDS' cap.
3067 *
3068 * "ceph_seq_cmp(seq, cap->seq) <= 0" means we are processing a message
3069 * that was sent before the cap import message. So don't remove caps.
3070 */
3071 if (ceph_seq_cmp(seq, cap->seq) <= 0) {
3072 WARN_ON(cap != ci->i_auth_cap);
3073 WARN_ON(cap->cap_id != le64_to_cpu(grant->cap_id));
3074 seq = cap->seq;
3075 newcaps |= cap->issued;
3076 }
3077
3078 /*
3079 * If CACHE is being revoked, and we have no dirty buffers,
3080 * try to invalidate (once). (If there are dirty buffers, we
3081 * will invalidate _after_ writeback.)
3082 */
3083 if (!S_ISDIR(inode->i_mode) && /* don't invalidate readdir cache */
3084 ((cap->issued & ~newcaps) & CEPH_CAP_FILE_CACHE) &&
3085 (newcaps & CEPH_CAP_FILE_LAZYIO) == 0 &&
3086 !(ci->i_wrbuffer_ref || ci->i_wb_ref)) {
3087 if (try_nonblocking_invalidate(inode)) {
3088 /* there were locked pages.. invalidate later
3089 in a separate thread. */
3090 if (ci->i_rdcache_revoking != ci->i_rdcache_gen) {
3091 queue_invalidate = true;
3092 ci->i_rdcache_revoking = ci->i_rdcache_gen;
3093 }
3094 }
3095 }
3096
3097 /* side effects now are allowed */
3098 cap->cap_gen = session->s_cap_gen;
3099 cap->seq = seq;
3100
3101 __check_cap_issue(ci, cap, newcaps);
3102
3103 if ((newcaps & CEPH_CAP_AUTH_SHARED) &&
3104 (issued & CEPH_CAP_AUTH_EXCL) == 0) {
3105 inode->i_mode = le32_to_cpu(grant->mode);
3106 inode->i_uid = make_kuid(&init_user_ns, le32_to_cpu(grant->uid));
3107 inode->i_gid = make_kgid(&init_user_ns, le32_to_cpu(grant->gid));
3108 dout("%p mode 0%o uid.gid %d.%d\n", inode, inode->i_mode,
3109 from_kuid(&init_user_ns, inode->i_uid),
3110 from_kgid(&init_user_ns, inode->i_gid));
3111 }
3112
3113 if ((newcaps & CEPH_CAP_AUTH_SHARED) &&
3114 (issued & CEPH_CAP_LINK_EXCL) == 0) {
3115 set_nlink(inode, le32_to_cpu(grant->nlink));
3116 if (inode->i_nlink == 0 &&
3117 (newcaps & (CEPH_CAP_LINK_SHARED | CEPH_CAP_LINK_EXCL)))
3118 deleted_inode = true;
3119 }
3120
3121 if ((issued & CEPH_CAP_XATTR_EXCL) == 0 && grant->xattr_len) {
3122 int len = le32_to_cpu(grant->xattr_len);
3123 u64 version = le64_to_cpu(grant->xattr_version);
3124
3125 if (version > ci->i_xattrs.version) {
3126 dout(" got new xattrs v%llu on %p len %d\n",
3127 version, inode, len);
3128 if (ci->i_xattrs.blob)
3129 ceph_buffer_put(ci->i_xattrs.blob);
3130 ci->i_xattrs.blob = ceph_buffer_get(xattr_buf);
3131 ci->i_xattrs.version = version;
3132 ceph_forget_all_cached_acls(inode);
3133 }
3134 }
3135
3136 if (newcaps & CEPH_CAP_ANY_RD) {
3137 /* ctime/mtime/atime? */
3138 ceph_decode_timespec(&mtime, &grant->mtime);
3139 ceph_decode_timespec(&atime, &grant->atime);
3140 ceph_decode_timespec(&ctime, &grant->ctime);
3141 ceph_fill_file_time(inode, issued,
3142 le32_to_cpu(grant->time_warp_seq),
3143 &ctime, &mtime, &atime);
3144 }
3145
3146 if (newcaps & (CEPH_CAP_ANY_FILE_RD | CEPH_CAP_ANY_FILE_WR)) {
3147 /* file layout may have changed */
3148 s64 old_pool = ci->i_layout.pool_id;
3149 struct ceph_string *old_ns;
3150
3151 ceph_file_layout_from_legacy(&ci->i_layout, &grant->layout);
3152 old_ns = rcu_dereference_protected(ci->i_layout.pool_ns,
3153 lockdep_is_held(&ci->i_ceph_lock));
3154 rcu_assign_pointer(ci->i_layout.pool_ns, *pns);
3155
3156 if (ci->i_layout.pool_id != old_pool || *pns != old_ns)
3157 ci->i_ceph_flags &= ~CEPH_I_POOL_PERM;
3158
3159 *pns = old_ns;
3160
3161 /* size/truncate_seq? */
3162 queue_trunc = ceph_fill_file_size(inode, issued,
3163 le32_to_cpu(grant->truncate_seq),
3164 le64_to_cpu(grant->truncate_size),
3165 size);
3166 }
3167
3168 if (ci->i_auth_cap == cap && (newcaps & CEPH_CAP_ANY_FILE_WR)) {
3169 if (max_size != ci->i_max_size) {
3170 dout("max_size %lld -> %llu\n",
3171 ci->i_max_size, max_size);
3172 ci->i_max_size = max_size;
3173 if (max_size >= ci->i_wanted_max_size) {
3174 ci->i_wanted_max_size = 0; /* reset */
3175 ci->i_requested_max_size = 0;
3176 }
3177 wake = true;
3178 } else if (ci->i_wanted_max_size > ci->i_max_size &&
3179 ci->i_wanted_max_size > ci->i_requested_max_size) {
3180 /* CEPH_CAP_OP_IMPORT */
3181 wake = true;
3182 }
3183 }
3184
3185 /* check cap bits */
3186 wanted = __ceph_caps_wanted(ci);
3187 used = __ceph_caps_used(ci);
3188 dirty = __ceph_caps_dirty(ci);
3189 dout(" my wanted = %s, used = %s, dirty %s\n",
3190 ceph_cap_string(wanted),
3191 ceph_cap_string(used),
3192 ceph_cap_string(dirty));
3193 if (wanted != le32_to_cpu(grant->wanted)) {
3194 dout("mds wanted %s -> %s\n",
3195 ceph_cap_string(le32_to_cpu(grant->wanted)),
3196 ceph_cap_string(wanted));
3197 /* imported cap may not have correct mds_wanted */
3198 if (le32_to_cpu(grant->op) == CEPH_CAP_OP_IMPORT)
3199 check_caps = 1;
3200 }
3201
3202 /* revocation, grant, or no-op? */
3203 if (cap->issued & ~newcaps) {
3204 int revoking = cap->issued & ~newcaps;
3205
3206 dout("revocation: %s -> %s (revoking %s)\n",
3207 ceph_cap_string(cap->issued),
3208 ceph_cap_string(newcaps),
3209 ceph_cap_string(revoking));
3210 if (revoking & used & CEPH_CAP_FILE_BUFFER)
3211 writeback = true; /* initiate writeback; will delay ack */
3212 else if (revoking == CEPH_CAP_FILE_CACHE &&
3213 (newcaps & CEPH_CAP_FILE_LAZYIO) == 0 &&
3214 queue_invalidate)
3215 ; /* do nothing yet, invalidation will be queued */
3216 else if (cap == ci->i_auth_cap)
3217 check_caps = 1; /* check auth cap only */
3218 else
3219 check_caps = 2; /* check all caps */
3220 cap->issued = newcaps;
3221 cap->implemented |= newcaps;
3222 } else if (cap->issued == newcaps) {
3223 dout("caps unchanged: %s -> %s\n",
3224 ceph_cap_string(cap->issued), ceph_cap_string(newcaps));
3225 } else {
3226 dout("grant: %s -> %s\n", ceph_cap_string(cap->issued),
3227 ceph_cap_string(newcaps));
3228 /* non-auth MDS is revoking the newly grant caps ? */
3229 if (cap == ci->i_auth_cap &&
3230 __ceph_caps_revoking_other(ci, cap, newcaps))
3231 check_caps = 2;
3232
3233 cap->issued = newcaps;
3234 cap->implemented |= newcaps; /* add bits only, to
3235 * avoid stepping on a
3236 * pending revocation */
3237 wake = true;
3238 }
3239 BUG_ON(cap->issued & ~cap->implemented);
3240
3241 if (inline_version > 0 && inline_version >= ci->i_inline_version) {
3242 ci->i_inline_version = inline_version;
3243 if (ci->i_inline_version != CEPH_INLINE_NONE &&
3244 (newcaps & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)))
3245 fill_inline = true;
3246 }
3247
3248 if (le32_to_cpu(grant->op) == CEPH_CAP_OP_IMPORT) {
3249 if (newcaps & ~issued)
3250 wake = true;
3251 kick_flushing_inode_caps(mdsc, session, inode);
3252 up_read(&mdsc->snap_rwsem);
3253 } else {
3254 spin_unlock(&ci->i_ceph_lock);
3255 }
3256
3257 if (fill_inline)
3258 ceph_fill_inline_data(inode, NULL, inline_data, inline_len);
3259
3260 if (queue_trunc)
3261 ceph_queue_vmtruncate(inode);
3262
3263 if (writeback)
3264 /*
3265 * queue inode for writeback: we can't actually call
3266 * filemap_write_and_wait, etc. from message handler
3267 * context.
3268 */
3269 ceph_queue_writeback(inode);
3270 if (queue_invalidate)
3271 ceph_queue_invalidate(inode);
3272 if (deleted_inode)
3273 invalidate_aliases(inode);
3274 if (wake)
3275 wake_up_all(&ci->i_cap_wq);
3276
3277 if (check_caps == 1)
3278 ceph_check_caps(ci, CHECK_CAPS_NODELAY|CHECK_CAPS_AUTHONLY,
3279 session);
3280 else if (check_caps == 2)
3281 ceph_check_caps(ci, CHECK_CAPS_NODELAY, session);
3282 else
3283 mutex_unlock(&session->s_mutex);
3284}
3285
3286/*
3287 * Handle FLUSH_ACK from MDS, indicating that metadata we sent to the
3288 * MDS has been safely committed.
3289 */
3290static void handle_cap_flush_ack(struct inode *inode, u64 flush_tid,
3291 struct ceph_mds_caps *m,
3292 struct ceph_mds_session *session,
3293 struct ceph_cap *cap)
3294 __releases(ci->i_ceph_lock)
3295{
3296 struct ceph_inode_info *ci = ceph_inode(inode);
3297 struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
3298 struct ceph_cap_flush *cf, *tmp_cf;
3299 LIST_HEAD(to_remove);
3300 unsigned seq = le32_to_cpu(m->seq);
3301 int dirty = le32_to_cpu(m->dirty);
3302 int cleaned = 0;
3303 bool drop = false;
3304 bool wake_ci = false;
3305 bool wake_mdsc = false;
3306
3307 list_for_each_entry_safe(cf, tmp_cf, &ci->i_cap_flush_list, i_list) {
3308 if (cf->tid == flush_tid)
3309 cleaned = cf->caps;
3310 if (cf->caps == 0) /* capsnap */
3311 continue;
3312 if (cf->tid <= flush_tid) {
3313 if (__finish_cap_flush(NULL, ci, cf))
3314 wake_ci = true;
3315 list_add_tail(&cf->i_list, &to_remove);
3316 } else {
3317 cleaned &= ~cf->caps;
3318 if (!cleaned)
3319 break;
3320 }
3321 }
3322
3323 dout("handle_cap_flush_ack inode %p mds%d seq %d on %s cleaned %s,"
3324 " flushing %s -> %s\n",
3325 inode, session->s_mds, seq, ceph_cap_string(dirty),
3326 ceph_cap_string(cleaned), ceph_cap_string(ci->i_flushing_caps),
3327 ceph_cap_string(ci->i_flushing_caps & ~cleaned));
3328
3329 if (list_empty(&to_remove) && !cleaned)
3330 goto out;
3331
3332 ci->i_flushing_caps &= ~cleaned;
3333
3334 spin_lock(&mdsc->cap_dirty_lock);
3335
3336 list_for_each_entry(cf, &to_remove, i_list) {
3337 if (__finish_cap_flush(mdsc, NULL, cf))
3338 wake_mdsc = true;
3339 }
3340
3341 if (ci->i_flushing_caps == 0) {
3342 if (list_empty(&ci->i_cap_flush_list)) {
3343 list_del_init(&ci->i_flushing_item);
3344 if (!list_empty(&session->s_cap_flushing)) {
3345 dout(" mds%d still flushing cap on %p\n",
3346 session->s_mds,
3347 &list_first_entry(&session->s_cap_flushing,
3348 struct ceph_inode_info,
3349 i_flushing_item)->vfs_inode);
3350 }
3351 }
3352 mdsc->num_cap_flushing--;
3353 dout(" inode %p now !flushing\n", inode);
3354
3355 if (ci->i_dirty_caps == 0) {
3356 dout(" inode %p now clean\n", inode);
3357 BUG_ON(!list_empty(&ci->i_dirty_item));
3358 drop = true;
3359 if (ci->i_wr_ref == 0 &&
3360 ci->i_wrbuffer_ref_head == 0) {
3361 BUG_ON(!ci->i_head_snapc);
3362 ceph_put_snap_context(ci->i_head_snapc);
3363 ci->i_head_snapc = NULL;
3364 }
3365 } else {
3366 BUG_ON(list_empty(&ci->i_dirty_item));
3367 }
3368 }
3369 spin_unlock(&mdsc->cap_dirty_lock);
3370
3371out:
3372 spin_unlock(&ci->i_ceph_lock);
3373
3374 while (!list_empty(&to_remove)) {
3375 cf = list_first_entry(&to_remove,
3376 struct ceph_cap_flush, i_list);
3377 list_del(&cf->i_list);
3378 ceph_free_cap_flush(cf);
3379 }
3380
3381 if (wake_ci)
3382 wake_up_all(&ci->i_cap_wq);
3383 if (wake_mdsc)
3384 wake_up_all(&mdsc->cap_flushing_wq);
3385 if (drop)
3386 iput(inode);
3387}
3388
3389/*
3390 * Handle FLUSHSNAP_ACK. MDS has flushed snap data to disk and we can
3391 * throw away our cap_snap.
3392 *
3393 * Caller hold s_mutex.
3394 */
3395static void handle_cap_flushsnap_ack(struct inode *inode, u64 flush_tid,
3396 struct ceph_mds_caps *m,
3397 struct ceph_mds_session *session)
3398{
3399 struct ceph_inode_info *ci = ceph_inode(inode);
3400 struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
3401 u64 follows = le64_to_cpu(m->snap_follows);
3402 struct ceph_cap_snap *capsnap;
3403 bool flushed = false;
3404 bool wake_ci = false;
3405 bool wake_mdsc = false;
3406
3407 dout("handle_cap_flushsnap_ack inode %p ci %p mds%d follows %lld\n",
3408 inode, ci, session->s_mds, follows);
3409
3410 spin_lock(&ci->i_ceph_lock);
3411 list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) {
3412 if (capsnap->follows == follows) {
3413 if (capsnap->cap_flush.tid != flush_tid) {
3414 dout(" cap_snap %p follows %lld tid %lld !="
3415 " %lld\n", capsnap, follows,
3416 flush_tid, capsnap->cap_flush.tid);
3417 break;
3418 }
3419 flushed = true;
3420 break;
3421 } else {
3422 dout(" skipping cap_snap %p follows %lld\n",
3423 capsnap, capsnap->follows);
3424 }
3425 }
3426 if (flushed) {
3427 WARN_ON(capsnap->dirty_pages || capsnap->writing);
3428 dout(" removing %p cap_snap %p follows %lld\n",
3429 inode, capsnap, follows);
3430 list_del(&capsnap->ci_item);
3431 if (__finish_cap_flush(NULL, ci, &capsnap->cap_flush))
3432 wake_ci = true;
3433
3434 spin_lock(&mdsc->cap_dirty_lock);
3435
3436 if (list_empty(&ci->i_cap_flush_list))
3437 list_del_init(&ci->i_flushing_item);
3438
3439 if (__finish_cap_flush(mdsc, NULL, &capsnap->cap_flush))
3440 wake_mdsc = true;
3441
3442 spin_unlock(&mdsc->cap_dirty_lock);
3443 }
3444 spin_unlock(&ci->i_ceph_lock);
3445 if (flushed) {
3446 ceph_put_snap_context(capsnap->context);
3447 ceph_put_cap_snap(capsnap);
3448 if (wake_ci)
3449 wake_up_all(&ci->i_cap_wq);
3450 if (wake_mdsc)
3451 wake_up_all(&mdsc->cap_flushing_wq);
3452 iput(inode);
3453 }
3454}
3455
3456/*
3457 * Handle TRUNC from MDS, indicating file truncation.
3458 *
3459 * caller hold s_mutex.
3460 */
3461static void handle_cap_trunc(struct inode *inode,
3462 struct ceph_mds_caps *trunc,
3463 struct ceph_mds_session *session)
3464 __releases(ci->i_ceph_lock)
3465{
3466 struct ceph_inode_info *ci = ceph_inode(inode);
3467 int mds = session->s_mds;
3468 int seq = le32_to_cpu(trunc->seq);
3469 u32 truncate_seq = le32_to_cpu(trunc->truncate_seq);
3470 u64 truncate_size = le64_to_cpu(trunc->truncate_size);
3471 u64 size = le64_to_cpu(trunc->size);
3472 int implemented = 0;
3473 int dirty = __ceph_caps_dirty(ci);
3474 int issued = __ceph_caps_issued(ceph_inode(inode), &implemented);
3475 int queue_trunc = 0;
3476
3477 issued |= implemented | dirty;
3478
3479 dout("handle_cap_trunc inode %p mds%d seq %d to %lld seq %d\n",
3480 inode, mds, seq, truncate_size, truncate_seq);
3481 queue_trunc = ceph_fill_file_size(inode, issued,
3482 truncate_seq, truncate_size, size);
3483 spin_unlock(&ci->i_ceph_lock);
3484
3485 if (queue_trunc)
3486 ceph_queue_vmtruncate(inode);
3487}
3488
3489/*
3490 * Handle EXPORT from MDS. Cap is being migrated _from_ this mds to a
3491 * different one. If we are the most recent migration we've seen (as
3492 * indicated by mseq), make note of the migrating cap bits for the
3493 * duration (until we see the corresponding IMPORT).
3494 *
3495 * caller holds s_mutex
3496 */
3497static void handle_cap_export(struct inode *inode, struct ceph_mds_caps *ex,
3498 struct ceph_mds_cap_peer *ph,
3499 struct ceph_mds_session *session)
3500{
3501 struct ceph_mds_client *mdsc = ceph_inode_to_client(inode)->mdsc;
3502 struct ceph_mds_session *tsession = NULL;
3503 struct ceph_cap *cap, *tcap, *new_cap = NULL;
3504 struct ceph_inode_info *ci = ceph_inode(inode);
3505 u64 t_cap_id;
3506 unsigned mseq = le32_to_cpu(ex->migrate_seq);
3507 unsigned t_seq, t_mseq;
3508 int target, issued;
3509 int mds = session->s_mds;
3510
3511 if (ph) {
3512 t_cap_id = le64_to_cpu(ph->cap_id);
3513 t_seq = le32_to_cpu(ph->seq);
3514 t_mseq = le32_to_cpu(ph->mseq);
3515 target = le32_to_cpu(ph->mds);
3516 } else {
3517 t_cap_id = t_seq = t_mseq = 0;
3518 target = -1;
3519 }
3520
3521 dout("handle_cap_export inode %p ci %p mds%d mseq %d target %d\n",
3522 inode, ci, mds, mseq, target);
3523retry:
3524 spin_lock(&ci->i_ceph_lock);
3525 cap = __get_cap_for_mds(ci, mds);
3526 if (!cap || cap->cap_id != le64_to_cpu(ex->cap_id))
3527 goto out_unlock;
3528
3529 if (target < 0) {
3530 __ceph_remove_cap(cap, false);
3531 if (!ci->i_auth_cap)
3532 ci->i_ceph_flags |= CEPH_I_CAP_DROPPED;
3533 goto out_unlock;
3534 }
3535
3536 /*
3537 * now we know we haven't received the cap import message yet
3538 * because the exported cap still exist.
3539 */
3540
3541 issued = cap->issued;
3542 if (issued != cap->implemented)
3543 pr_err_ratelimited("handle_cap_export: issued != implemented: "
3544 "ino (%llx.%llx) mds%d seq %d mseq %d "
3545 "issued %s implemented %s\n",
3546 ceph_vinop(inode), mds, cap->seq, cap->mseq,
3547 ceph_cap_string(issued),
3548 ceph_cap_string(cap->implemented));
3549
3550
3551 tcap = __get_cap_for_mds(ci, target);
3552 if (tcap) {
3553 /* already have caps from the target */
3554 if (tcap->cap_id == t_cap_id &&
3555 ceph_seq_cmp(tcap->seq, t_seq) < 0) {
3556 dout(" updating import cap %p mds%d\n", tcap, target);
3557 tcap->cap_id = t_cap_id;
3558 tcap->seq = t_seq - 1;
3559 tcap->issue_seq = t_seq - 1;
3560 tcap->mseq = t_mseq;
3561 tcap->issued |= issued;
3562 tcap->implemented |= issued;
3563 if (cap == ci->i_auth_cap)
3564 ci->i_auth_cap = tcap;
3565
3566 if (!list_empty(&ci->i_cap_flush_list) &&
3567 ci->i_auth_cap == tcap) {
3568 spin_lock(&mdsc->cap_dirty_lock);
3569 list_move_tail(&ci->i_flushing_item,
3570 &tcap->session->s_cap_flushing);
3571 spin_unlock(&mdsc->cap_dirty_lock);
3572 }
3573 }
3574 __ceph_remove_cap(cap, false);
3575 goto out_unlock;
3576 } else if (tsession) {
3577 /* add placeholder for the export tagert */
3578 int flag = (cap == ci->i_auth_cap) ? CEPH_CAP_FLAG_AUTH : 0;
3579 tcap = new_cap;
3580 ceph_add_cap(inode, tsession, t_cap_id, -1, issued, 0,
3581 t_seq - 1, t_mseq, (u64)-1, flag, &new_cap);
3582
3583 if (!list_empty(&ci->i_cap_flush_list) &&
3584 ci->i_auth_cap == tcap) {
3585 spin_lock(&mdsc->cap_dirty_lock);
3586 list_move_tail(&ci->i_flushing_item,
3587 &tcap->session->s_cap_flushing);
3588 spin_unlock(&mdsc->cap_dirty_lock);
3589 }
3590
3591 __ceph_remove_cap(cap, false);
3592 goto out_unlock;
3593 }
3594
3595 spin_unlock(&ci->i_ceph_lock);
3596 mutex_unlock(&session->s_mutex);
3597
3598 /* open target session */
3599 tsession = ceph_mdsc_open_export_target_session(mdsc, target);
3600 if (!IS_ERR(tsession)) {
3601 if (mds > target) {
3602 mutex_lock(&session->s_mutex);
3603 mutex_lock_nested(&tsession->s_mutex,
3604 SINGLE_DEPTH_NESTING);
3605 } else {
3606 mutex_lock(&tsession->s_mutex);
3607 mutex_lock_nested(&session->s_mutex,
3608 SINGLE_DEPTH_NESTING);
3609 }
3610 new_cap = ceph_get_cap(mdsc, NULL);
3611 } else {
3612 WARN_ON(1);
3613 tsession = NULL;
3614 target = -1;
3615 }
3616 goto retry;
3617
3618out_unlock:
3619 spin_unlock(&ci->i_ceph_lock);
3620 mutex_unlock(&session->s_mutex);
3621 if (tsession) {
3622 mutex_unlock(&tsession->s_mutex);
3623 ceph_put_mds_session(tsession);
3624 }
3625 if (new_cap)
3626 ceph_put_cap(mdsc, new_cap);
3627}
3628
3629/*
3630 * Handle cap IMPORT.
3631 *
3632 * caller holds s_mutex. acquires i_ceph_lock
3633 */
3634static void handle_cap_import(struct ceph_mds_client *mdsc,
3635 struct inode *inode, struct ceph_mds_caps *im,
3636 struct ceph_mds_cap_peer *ph,
3637 struct ceph_mds_session *session,
3638 struct ceph_cap **target_cap, int *old_issued)
3639 __acquires(ci->i_ceph_lock)
3640{
3641 struct ceph_inode_info *ci = ceph_inode(inode);
3642 struct ceph_cap *cap, *ocap, *new_cap = NULL;
3643 int mds = session->s_mds;
3644 int issued;
3645 unsigned caps = le32_to_cpu(im->caps);
3646 unsigned wanted = le32_to_cpu(im->wanted);
3647 unsigned seq = le32_to_cpu(im->seq);
3648 unsigned mseq = le32_to_cpu(im->migrate_seq);
3649 u64 realmino = le64_to_cpu(im->realm);
3650 u64 cap_id = le64_to_cpu(im->cap_id);
3651 u64 p_cap_id;
3652 int peer;
3653
3654 if (ph) {
3655 p_cap_id = le64_to_cpu(ph->cap_id);
3656 peer = le32_to_cpu(ph->mds);
3657 } else {
3658 p_cap_id = 0;
3659 peer = -1;
3660 }
3661
3662 dout("handle_cap_import inode %p ci %p mds%d mseq %d peer %d\n",
3663 inode, ci, mds, mseq, peer);
3664
3665retry:
3666 spin_lock(&ci->i_ceph_lock);
3667 cap = __get_cap_for_mds(ci, mds);
3668 if (!cap) {
3669 if (!new_cap) {
3670 spin_unlock(&ci->i_ceph_lock);
3671 new_cap = ceph_get_cap(mdsc, NULL);
3672 goto retry;
3673 }
3674 cap = new_cap;
3675 } else {
3676 if (new_cap) {
3677 ceph_put_cap(mdsc, new_cap);
3678 new_cap = NULL;
3679 }
3680 }
3681
3682 __ceph_caps_issued(ci, &issued);
3683 issued |= __ceph_caps_dirty(ci);
3684
3685 ceph_add_cap(inode, session, cap_id, -1, caps, wanted, seq, mseq,
3686 realmino, CEPH_CAP_FLAG_AUTH, &new_cap);
3687
3688 ocap = peer >= 0 ? __get_cap_for_mds(ci, peer) : NULL;
3689 if (ocap && ocap->cap_id == p_cap_id) {
3690 dout(" remove export cap %p mds%d flags %d\n",
3691 ocap, peer, ph->flags);
3692 if ((ph->flags & CEPH_CAP_FLAG_AUTH) &&
3693 (ocap->seq != le32_to_cpu(ph->seq) ||
3694 ocap->mseq != le32_to_cpu(ph->mseq))) {
3695 pr_err_ratelimited("handle_cap_import: "
3696 "mismatched seq/mseq: ino (%llx.%llx) "
3697 "mds%d seq %d mseq %d importer mds%d "
3698 "has peer seq %d mseq %d\n",
3699 ceph_vinop(inode), peer, ocap->seq,
3700 ocap->mseq, mds, le32_to_cpu(ph->seq),
3701 le32_to_cpu(ph->mseq));
3702 }
3703 __ceph_remove_cap(ocap, (ph->flags & CEPH_CAP_FLAG_RELEASE));
3704 }
3705
3706 /* make sure we re-request max_size, if necessary */
3707 ci->i_requested_max_size = 0;
3708
3709 *old_issued = issued;
3710 *target_cap = cap;
3711}
3712
3713/*
3714 * Handle a caps message from the MDS.
3715 *
3716 * Identify the appropriate session, inode, and call the right handler
3717 * based on the cap op.
3718 */
3719void ceph_handle_caps(struct ceph_mds_session *session,
3720 struct ceph_msg *msg)
3721{
3722 struct ceph_mds_client *mdsc = session->s_mdsc;
3723 struct super_block *sb = mdsc->fsc->sb;
3724 struct inode *inode;
3725 struct ceph_inode_info *ci;
3726 struct ceph_cap *cap;
3727 struct ceph_mds_caps *h;
3728 struct ceph_mds_cap_peer *peer = NULL;
3729 struct ceph_snap_realm *realm = NULL;
3730 struct ceph_string *pool_ns = NULL;
3731 int mds = session->s_mds;
3732 int op, issued;
3733 u32 seq, mseq;
3734 struct ceph_vino vino;
3735 u64 tid;
3736 u64 inline_version = 0;
3737 void *inline_data = NULL;
3738 u32 inline_len = 0;
3739 void *snaptrace;
3740 size_t snaptrace_len;
3741 void *p, *end;
3742
3743 dout("handle_caps from mds%d\n", mds);
3744
3745 /* decode */
3746 end = msg->front.iov_base + msg->front.iov_len;
3747 tid = le64_to_cpu(msg->hdr.tid);
3748 if (msg->front.iov_len < sizeof(*h))
3749 goto bad;
3750 h = msg->front.iov_base;
3751 op = le32_to_cpu(h->op);
3752 vino.ino = le64_to_cpu(h->ino);
3753 vino.snap = CEPH_NOSNAP;
3754 seq = le32_to_cpu(h->seq);
3755 mseq = le32_to_cpu(h->migrate_seq);
3756
3757 snaptrace = h + 1;
3758 snaptrace_len = le32_to_cpu(h->snap_trace_len);
3759 p = snaptrace + snaptrace_len;
3760
3761 if (le16_to_cpu(msg->hdr.version) >= 2) {
3762 u32 flock_len;
3763 ceph_decode_32_safe(&p, end, flock_len, bad);
3764 if (p + flock_len > end)
3765 goto bad;
3766 p += flock_len;
3767 }
3768
3769 if (le16_to_cpu(msg->hdr.version) >= 3) {
3770 if (op == CEPH_CAP_OP_IMPORT) {
3771 if (p + sizeof(*peer) > end)
3772 goto bad;
3773 peer = p;
3774 p += sizeof(*peer);
3775 } else if (op == CEPH_CAP_OP_EXPORT) {
3776 /* recorded in unused fields */
3777 peer = (void *)&h->size;
3778 }
3779 }
3780
3781 if (le16_to_cpu(msg->hdr.version) >= 4) {
3782 ceph_decode_64_safe(&p, end, inline_version, bad);
3783 ceph_decode_32_safe(&p, end, inline_len, bad);
3784 if (p + inline_len > end)
3785 goto bad;
3786 inline_data = p;
3787 p += inline_len;
3788 }
3789
3790 if (le16_to_cpu(msg->hdr.version) >= 5) {
3791 struct ceph_osd_client *osdc = &mdsc->fsc->client->osdc;
3792 u32 epoch_barrier;
3793
3794 ceph_decode_32_safe(&p, end, epoch_barrier, bad);
3795 ceph_osdc_update_epoch_barrier(osdc, epoch_barrier);
3796 }
3797
3798 if (le16_to_cpu(msg->hdr.version) >= 8) {
3799 u64 flush_tid;
3800 u32 caller_uid, caller_gid;
3801 u32 pool_ns_len;
3802
3803 /* version >= 6 */
3804 ceph_decode_64_safe(&p, end, flush_tid, bad);
3805 /* version >= 7 */
3806 ceph_decode_32_safe(&p, end, caller_uid, bad);
3807 ceph_decode_32_safe(&p, end, caller_gid, bad);
3808 /* version >= 8 */
3809 ceph_decode_32_safe(&p, end, pool_ns_len, bad);
3810 if (pool_ns_len > 0) {
3811 ceph_decode_need(&p, end, pool_ns_len, bad);
3812 pool_ns = ceph_find_or_create_string(p, pool_ns_len);
3813 p += pool_ns_len;
3814 }
3815 }
3816
3817 /* lookup ino */
3818 inode = ceph_find_inode(sb, vino);
3819 ci = ceph_inode(inode);
3820 dout(" op %s ino %llx.%llx inode %p\n", ceph_cap_op_name(op), vino.ino,
3821 vino.snap, inode);
3822
3823 mutex_lock(&session->s_mutex);
3824 session->s_seq++;
3825 dout(" mds%d seq %lld cap seq %u\n", session->s_mds, session->s_seq,
3826 (unsigned)seq);
3827
3828 if (!inode) {
3829 dout(" i don't have ino %llx\n", vino.ino);
3830
3831 if (op == CEPH_CAP_OP_IMPORT) {
3832 cap = ceph_get_cap(mdsc, NULL);
3833 cap->cap_ino = vino.ino;
3834 cap->queue_release = 1;
3835 cap->cap_id = le64_to_cpu(h->cap_id);
3836 cap->mseq = mseq;
3837 cap->seq = seq;
3838 cap->issue_seq = seq;
3839 spin_lock(&session->s_cap_lock);
3840 list_add_tail(&cap->session_caps,
3841 &session->s_cap_releases);
3842 session->s_num_cap_releases++;
3843 spin_unlock(&session->s_cap_lock);
3844 }
3845 goto flush_cap_releases;
3846 }
3847
3848 /* these will work even if we don't have a cap yet */
3849 switch (op) {
3850 case CEPH_CAP_OP_FLUSHSNAP_ACK:
3851 handle_cap_flushsnap_ack(inode, tid, h, session);
3852 goto done;
3853
3854 case CEPH_CAP_OP_EXPORT:
3855 handle_cap_export(inode, h, peer, session);
3856 goto done_unlocked;
3857
3858 case CEPH_CAP_OP_IMPORT:
3859 realm = NULL;
3860 if (snaptrace_len) {
3861 down_write(&mdsc->snap_rwsem);
3862 ceph_update_snap_trace(mdsc, snaptrace,
3863 snaptrace + snaptrace_len,
3864 false, &realm);
3865 downgrade_write(&mdsc->snap_rwsem);
3866 } else {
3867 down_read(&mdsc->snap_rwsem);
3868 }
3869 handle_cap_import(mdsc, inode, h, peer, session,
3870 &cap, &issued);
3871 handle_cap_grant(mdsc, inode, h, &pool_ns,
3872 inline_version, inline_data, inline_len,
3873 msg->middle, session, cap, issued);
3874 if (realm)
3875 ceph_put_snap_realm(mdsc, realm);
3876 goto done_unlocked;
3877 }
3878
3879 /* the rest require a cap */
3880 spin_lock(&ci->i_ceph_lock);
3881 cap = __get_cap_for_mds(ceph_inode(inode), mds);
3882 if (!cap) {
3883 dout(" no cap on %p ino %llx.%llx from mds%d\n",
3884 inode, ceph_ino(inode), ceph_snap(inode), mds);
3885 spin_unlock(&ci->i_ceph_lock);
3886 goto flush_cap_releases;
3887 }
3888
3889 /* note that each of these drops i_ceph_lock for us */
3890 switch (op) {
3891 case CEPH_CAP_OP_REVOKE:
3892 case CEPH_CAP_OP_GRANT:
3893 __ceph_caps_issued(ci, &issued);
3894 issued |= __ceph_caps_dirty(ci);
3895 handle_cap_grant(mdsc, inode, h, &pool_ns,
3896 inline_version, inline_data, inline_len,
3897 msg->middle, session, cap, issued);
3898 goto done_unlocked;
3899
3900 case CEPH_CAP_OP_FLUSH_ACK:
3901 handle_cap_flush_ack(inode, tid, h, session, cap);
3902 break;
3903
3904 case CEPH_CAP_OP_TRUNC:
3905 handle_cap_trunc(inode, h, session);
3906 break;
3907
3908 default:
3909 spin_unlock(&ci->i_ceph_lock);
3910 pr_err("ceph_handle_caps: unknown cap op %d %s\n", op,
3911 ceph_cap_op_name(op));
3912 }
3913
3914 goto done;
3915
3916flush_cap_releases:
3917 /*
3918 * send any cap release message to try to move things
3919 * along for the mds (who clearly thinks we still have this
3920 * cap).
3921 */
3922 ceph_send_cap_releases(mdsc, session);
3923
3924done:
3925 mutex_unlock(&session->s_mutex);
3926done_unlocked:
3927 iput(inode);
3928 ceph_put_string(pool_ns);
3929 return;
3930
3931bad:
3932 pr_err("ceph_handle_caps: corrupt message\n");
3933 ceph_msg_dump(msg);
3934 return;
3935}
3936
3937/*
3938 * Delayed work handler to process end of delayed cap release LRU list.
3939 */
3940void ceph_check_delayed_caps(struct ceph_mds_client *mdsc)
3941{
3942 struct inode *inode;
3943 struct ceph_inode_info *ci;
3944 int flags = CHECK_CAPS_NODELAY;
3945
3946 dout("check_delayed_caps\n");
3947 while (1) {
3948 spin_lock(&mdsc->cap_delay_lock);
3949 if (list_empty(&mdsc->cap_delay_list))
3950 break;
3951 ci = list_first_entry(&mdsc->cap_delay_list,
3952 struct ceph_inode_info,
3953 i_cap_delay_list);
3954 if ((ci->i_ceph_flags & CEPH_I_FLUSH) == 0 &&
3955 time_before(jiffies, ci->i_hold_caps_max))
3956 break;
3957 list_del_init(&ci->i_cap_delay_list);
3958
3959 inode = igrab(&ci->vfs_inode);
3960 spin_unlock(&mdsc->cap_delay_lock);
3961
3962 if (inode) {
3963 dout("check_delayed_caps on %p\n", inode);
3964 ceph_check_caps(ci, flags, NULL);
3965 iput(inode);
3966 }
3967 }
3968 spin_unlock(&mdsc->cap_delay_lock);
3969}
3970
3971/*
3972 * Flush all dirty caps to the mds
3973 */
3974void ceph_flush_dirty_caps(struct ceph_mds_client *mdsc)
3975{
3976 struct ceph_inode_info *ci;
3977 struct inode *inode;
3978
3979 dout("flush_dirty_caps\n");
3980 spin_lock(&mdsc->cap_dirty_lock);
3981 while (!list_empty(&mdsc->cap_dirty)) {
3982 ci = list_first_entry(&mdsc->cap_dirty, struct ceph_inode_info,
3983 i_dirty_item);
3984 inode = &ci->vfs_inode;
3985 ihold(inode);
3986 dout("flush_dirty_caps %p\n", inode);
3987 spin_unlock(&mdsc->cap_dirty_lock);
3988 ceph_check_caps(ci, CHECK_CAPS_NODELAY|CHECK_CAPS_FLUSH, NULL);
3989 iput(inode);
3990 spin_lock(&mdsc->cap_dirty_lock);
3991 }
3992 spin_unlock(&mdsc->cap_dirty_lock);
3993 dout("flush_dirty_caps done\n");
3994}
3995
3996void __ceph_get_fmode(struct ceph_inode_info *ci, int fmode)
3997{
3998 int i;
3999 int bits = (fmode << 1) | 1;
4000 for (i = 0; i < CEPH_FILE_MODE_BITS; i++) {
4001 if (bits & (1 << i))
4002 ci->i_nr_by_mode[i]++;
4003 }
4004}
4005
4006/*
4007 * Drop open file reference. If we were the last open file,
4008 * we may need to release capabilities to the MDS (or schedule
4009 * their delayed release).
4010 */
4011void ceph_put_fmode(struct ceph_inode_info *ci, int fmode)
4012{
4013 int i, last = 0;
4014 int bits = (fmode << 1) | 1;
4015 spin_lock(&ci->i_ceph_lock);
4016 for (i = 0; i < CEPH_FILE_MODE_BITS; i++) {
4017 if (bits & (1 << i)) {
4018 BUG_ON(ci->i_nr_by_mode[i] == 0);
4019 if (--ci->i_nr_by_mode[i] == 0)
4020 last++;
4021 }
4022 }
4023 dout("put_fmode %p fmode %d {%d,%d,%d,%d}\n",
4024 &ci->vfs_inode, fmode,
4025 ci->i_nr_by_mode[0], ci->i_nr_by_mode[1],
4026 ci->i_nr_by_mode[2], ci->i_nr_by_mode[3]);
4027 spin_unlock(&ci->i_ceph_lock);
4028
4029 if (last && ci->i_vino.snap == CEPH_NOSNAP)
4030 ceph_check_caps(ci, 0, NULL);
4031}
4032
4033/*
4034 * For a soon-to-be unlinked file, drop the AUTH_RDCACHE caps. If it
4035 * looks like the link count will hit 0, drop any other caps (other
4036 * than PIN) we don't specifically want (due to the file still being
4037 * open).
4038 */
4039int ceph_drop_caps_for_unlink(struct inode *inode)
4040{
4041 struct ceph_inode_info *ci = ceph_inode(inode);
4042 int drop = CEPH_CAP_LINK_SHARED | CEPH_CAP_LINK_EXCL;
4043
4044 spin_lock(&ci->i_ceph_lock);
4045 if (inode->i_nlink == 1) {
4046 drop |= ~(__ceph_caps_wanted(ci) | CEPH_CAP_PIN);
4047
4048 ci->i_ceph_flags |= CEPH_I_NODELAY;
4049 if (__ceph_caps_dirty(ci)) {
4050 struct ceph_mds_client *mdsc =
4051 ceph_inode_to_client(inode)->mdsc;
4052 __cap_delay_requeue_front(mdsc, ci);
4053 }
4054 }
4055 spin_unlock(&ci->i_ceph_lock);
4056 return drop;
4057}
4058
4059/*
4060 * Helpers for embedding cap and dentry lease releases into mds
4061 * requests.
4062 *
4063 * @force is used by dentry_release (below) to force inclusion of a
4064 * record for the directory inode, even when there aren't any caps to
4065 * drop.
4066 */
4067int ceph_encode_inode_release(void **p, struct inode *inode,
4068 int mds, int drop, int unless, int force)
4069{
4070 struct ceph_inode_info *ci = ceph_inode(inode);
4071 struct ceph_cap *cap;
4072 struct ceph_mds_request_release *rel = *p;
4073 int used, dirty;
4074 int ret = 0;
4075
4076 spin_lock(&ci->i_ceph_lock);
4077 used = __ceph_caps_used(ci);
4078 dirty = __ceph_caps_dirty(ci);
4079
4080 dout("encode_inode_release %p mds%d used|dirty %s drop %s unless %s\n",
4081 inode, mds, ceph_cap_string(used|dirty), ceph_cap_string(drop),
4082 ceph_cap_string(unless));
4083
4084 /* only drop unused, clean caps */
4085 drop &= ~(used | dirty);
4086
4087 cap = __get_cap_for_mds(ci, mds);
4088 if (cap && __cap_is_valid(cap)) {
4089 unless &= cap->issued;
4090 if (unless) {
4091 if (unless & CEPH_CAP_AUTH_EXCL)
4092 drop &= ~CEPH_CAP_AUTH_SHARED;
4093 if (unless & CEPH_CAP_LINK_EXCL)
4094 drop &= ~CEPH_CAP_LINK_SHARED;
4095 if (unless & CEPH_CAP_XATTR_EXCL)
4096 drop &= ~CEPH_CAP_XATTR_SHARED;
4097 if (unless & CEPH_CAP_FILE_EXCL)
4098 drop &= ~CEPH_CAP_FILE_SHARED;
4099 }
4100
4101 if (force || (cap->issued & drop)) {
4102 if (cap->issued & drop) {
4103 int wanted = __ceph_caps_wanted(ci);
4104 if ((ci->i_ceph_flags & CEPH_I_NODELAY) == 0)
4105 wanted |= cap->mds_wanted;
4106 dout("encode_inode_release %p cap %p "
4107 "%s -> %s, wanted %s -> %s\n", inode, cap,
4108 ceph_cap_string(cap->issued),
4109 ceph_cap_string(cap->issued & ~drop),
4110 ceph_cap_string(cap->mds_wanted),
4111 ceph_cap_string(wanted));
4112
4113 cap->issued &= ~drop;
4114 cap->implemented &= ~drop;
4115 cap->mds_wanted = wanted;
4116 } else {
4117 dout("encode_inode_release %p cap %p %s"
4118 " (force)\n", inode, cap,
4119 ceph_cap_string(cap->issued));
4120 }
4121
4122 rel->ino = cpu_to_le64(ceph_ino(inode));
4123 rel->cap_id = cpu_to_le64(cap->cap_id);
4124 rel->seq = cpu_to_le32(cap->seq);
4125 rel->issue_seq = cpu_to_le32(cap->issue_seq);
4126 rel->mseq = cpu_to_le32(cap->mseq);
4127 rel->caps = cpu_to_le32(cap->implemented);
4128 rel->wanted = cpu_to_le32(cap->mds_wanted);
4129 rel->dname_len = 0;
4130 rel->dname_seq = 0;
4131 *p += sizeof(*rel);
4132 ret = 1;
4133 } else {
4134 dout("encode_inode_release %p cap %p %s (noop)\n",
4135 inode, cap, ceph_cap_string(cap->issued));
4136 }
4137 }
4138 spin_unlock(&ci->i_ceph_lock);
4139 return ret;
4140}
4141
4142int ceph_encode_dentry_release(void **p, struct dentry *dentry,
4143 struct inode *dir,
4144 int mds, int drop, int unless)
4145{
4146 struct dentry *parent = NULL;
4147 struct ceph_mds_request_release *rel = *p;
4148 struct ceph_dentry_info *di = ceph_dentry(dentry);
4149 int force = 0;
4150 int ret;
4151
4152 /*
4153 * force an record for the directory caps if we have a dentry lease.
4154 * this is racy (can't take i_ceph_lock and d_lock together), but it
4155 * doesn't have to be perfect; the mds will revoke anything we don't
4156 * release.
4157 */
4158 spin_lock(&dentry->d_lock);
4159 if (di->lease_session && di->lease_session->s_mds == mds)
4160 force = 1;
4161 if (!dir) {
4162 parent = dget(dentry->d_parent);
4163 dir = d_inode(parent);
4164 }
4165 spin_unlock(&dentry->d_lock);
4166
4167 ret = ceph_encode_inode_release(p, dir, mds, drop, unless, force);
4168 dput(parent);
4169
4170 spin_lock(&dentry->d_lock);
4171 if (ret && di->lease_session && di->lease_session->s_mds == mds) {
4172 dout("encode_dentry_release %p mds%d seq %d\n",
4173 dentry, mds, (int)di->lease_seq);
4174 rel->dname_len = cpu_to_le32(dentry->d_name.len);
4175 memcpy(*p, dentry->d_name.name, dentry->d_name.len);
4176 *p += dentry->d_name.len;
4177 rel->dname_seq = cpu_to_le32(di->lease_seq);
4178 __ceph_mdsc_drop_dentry_lease(dentry);
4179 }
4180 spin_unlock(&dentry->d_lock);
4181 return ret;
4182}
1#include <linux/ceph/ceph_debug.h>
2
3#include <linux/fs.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>
10
11#include "super.h"
12#include "mds_client.h"
13#include <linux/ceph/decode.h>
14#include <linux/ceph/messenger.h>
15
16/*
17 * Capability management
18 *
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.
24 *
25 * If the client holds a *_SHARED cap, the client has a coherent value
26 * that can be safely read from the cached inode.
27 *
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.
32 *
33 * In the event of a conflicting operation (perhaps by another
34 * client), the MDS will revoke the conflicting client capabilities.
35 *
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.
40 */
41
42
43/*
44 * Generate readable cap strings for debugging output.
45 */
46#define MAX_CAP_STR 20
47static char cap_str[MAX_CAP_STR][40];
48static DEFINE_SPINLOCK(cap_str_lock);
49static int last_cap_str;
50
51static char *gcap_string(char *s, int c)
52{
53 if (c & CEPH_CAP_GSHARED)
54 *s++ = 's';
55 if (c & CEPH_CAP_GEXCL)
56 *s++ = 'x';
57 if (c & CEPH_CAP_GCACHE)
58 *s++ = 'c';
59 if (c & CEPH_CAP_GRD)
60 *s++ = 'r';
61 if (c & CEPH_CAP_GWR)
62 *s++ = 'w';
63 if (c & CEPH_CAP_GBUFFER)
64 *s++ = 'b';
65 if (c & CEPH_CAP_GLAZYIO)
66 *s++ = 'l';
67 return s;
68}
69
70const char *ceph_cap_string(int caps)
71{
72 int i;
73 char *s;
74 int c;
75
76 spin_lock(&cap_str_lock);
77 i = last_cap_str++;
78 if (last_cap_str == MAX_CAP_STR)
79 last_cap_str = 0;
80 spin_unlock(&cap_str_lock);
81
82 s = cap_str[i];
83
84 if (caps & CEPH_CAP_PIN)
85 *s++ = 'p';
86
87 c = (caps >> CEPH_CAP_SAUTH) & 3;
88 if (c) {
89 *s++ = 'A';
90 s = gcap_string(s, c);
91 }
92
93 c = (caps >> CEPH_CAP_SLINK) & 3;
94 if (c) {
95 *s++ = 'L';
96 s = gcap_string(s, c);
97 }
98
99 c = (caps >> CEPH_CAP_SXATTR) & 3;
100 if (c) {
101 *s++ = 'X';
102 s = gcap_string(s, c);
103 }
104
105 c = caps >> CEPH_CAP_SFILE;
106 if (c) {
107 *s++ = 'F';
108 s = gcap_string(s, c);
109 }
110
111 if (s == cap_str[i])
112 *s++ = '-';
113 *s = 0;
114 return cap_str[i];
115}
116
117void ceph_caps_init(struct ceph_mds_client *mdsc)
118{
119 INIT_LIST_HEAD(&mdsc->caps_list);
120 spin_lock_init(&mdsc->caps_list_lock);
121}
122
123void ceph_caps_finalize(struct ceph_mds_client *mdsc)
124{
125 struct ceph_cap *cap;
126
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);
133 }
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);
140}
141
142void ceph_adjust_min_caps(struct ceph_mds_client *mdsc, int delta)
143{
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);
148}
149
150int ceph_reserve_caps(struct ceph_mds_client *mdsc,
151 struct ceph_cap_reservation *ctx, int need)
152{
153 int i;
154 struct ceph_cap *cap;
155 int have;
156 int alloc = 0;
157 LIST_HEAD(newcaps);
158 int ret = 0;
159
160 dout("reserve caps ctx=%p need=%d\n", ctx, need);
161
162 /* first reserve any caps that are already allocated */
163 spin_lock(&mdsc->caps_list_lock);
164 if (mdsc->caps_avail_count >= need)
165 have = need;
166 else
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);
174
175 for (i = have; i < need; i++) {
176 cap = kmem_cache_alloc(ceph_cap_cachep, GFP_NOFS);
177 if (!cap) {
178 ret = -ENOMEM;
179 goto out_alloc_count;
180 }
181 list_add(&cap->caps_item, &newcaps);
182 alloc++;
183 }
184 BUG_ON(have + alloc != need);
185
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);
190
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);
195
196 ctx->count = need;
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);
200 return 0;
201
202out_alloc_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",
205 ctx, need, have);
206 return ret;
207}
208
209int ceph_unreserve_caps(struct ceph_mds_client *mdsc,
210 struct ceph_cap_reservation *ctx)
211{
212 dout("unreserve caps ctx=%p count=%d\n", ctx, ctx->count);
213 if (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;
218 ctx->count = 0;
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);
226 }
227 return 0;
228}
229
230static struct ceph_cap *get_cap(struct ceph_mds_client *mdsc,
231 struct ceph_cap_reservation *ctx)
232{
233 struct ceph_cap *cap = NULL;
234
235 /* temporary, until we do something about cap import/export */
236 if (!ctx) {
237 cap = kmem_cache_alloc(ceph_cap_cachep, GFP_NOFS);
238 if (cap) {
239 mdsc->caps_use_count++;
240 mdsc->caps_total_count++;
241 }
242 return cap;
243 }
244
245 spin_lock(&mdsc->caps_list_lock);
246 dout("get_cap ctx=%p (%d) %d = %d used + %d resv + %d avail\n",
247 ctx, ctx->count, mdsc->caps_total_count, mdsc->caps_use_count,
248 mdsc->caps_reserve_count, mdsc->caps_avail_count);
249 BUG_ON(!ctx->count);
250 BUG_ON(ctx->count > mdsc->caps_reserve_count);
251 BUG_ON(list_empty(&mdsc->caps_list));
252
253 ctx->count--;
254 mdsc->caps_reserve_count--;
255 mdsc->caps_use_count++;
256
257 cap = list_first_entry(&mdsc->caps_list, struct ceph_cap, caps_item);
258 list_del(&cap->caps_item);
259
260 BUG_ON(mdsc->caps_total_count != mdsc->caps_use_count +
261 mdsc->caps_reserve_count + mdsc->caps_avail_count);
262 spin_unlock(&mdsc->caps_list_lock);
263 return cap;
264}
265
266void ceph_put_cap(struct ceph_mds_client *mdsc, struct ceph_cap *cap)
267{
268 spin_lock(&mdsc->caps_list_lock);
269 dout("put_cap %p %d = %d used + %d resv + %d avail\n",
270 cap, mdsc->caps_total_count, mdsc->caps_use_count,
271 mdsc->caps_reserve_count, mdsc->caps_avail_count);
272 mdsc->caps_use_count--;
273 /*
274 * Keep some preallocated caps around (ceph_min_count), to
275 * avoid lots of free/alloc churn.
276 */
277 if (mdsc->caps_avail_count >= mdsc->caps_reserve_count +
278 mdsc->caps_min_count) {
279 mdsc->caps_total_count--;
280 kmem_cache_free(ceph_cap_cachep, cap);
281 } else {
282 mdsc->caps_avail_count++;
283 list_add(&cap->caps_item, &mdsc->caps_list);
284 }
285
286 BUG_ON(mdsc->caps_total_count != mdsc->caps_use_count +
287 mdsc->caps_reserve_count + mdsc->caps_avail_count);
288 spin_unlock(&mdsc->caps_list_lock);
289}
290
291void ceph_reservation_status(struct ceph_fs_client *fsc,
292 int *total, int *avail, int *used, int *reserved,
293 int *min)
294{
295 struct ceph_mds_client *mdsc = fsc->mdsc;
296
297 if (total)
298 *total = mdsc->caps_total_count;
299 if (avail)
300 *avail = mdsc->caps_avail_count;
301 if (used)
302 *used = mdsc->caps_use_count;
303 if (reserved)
304 *reserved = mdsc->caps_reserve_count;
305 if (min)
306 *min = mdsc->caps_min_count;
307}
308
309/*
310 * Find ceph_cap for given mds, if any.
311 *
312 * Called with i_ceph_lock held.
313 */
314static struct ceph_cap *__get_cap_for_mds(struct ceph_inode_info *ci, int mds)
315{
316 struct ceph_cap *cap;
317 struct rb_node *n = ci->i_caps.rb_node;
318
319 while (n) {
320 cap = rb_entry(n, struct ceph_cap, ci_node);
321 if (mds < cap->mds)
322 n = n->rb_left;
323 else if (mds > cap->mds)
324 n = n->rb_right;
325 else
326 return cap;
327 }
328 return NULL;
329}
330
331struct ceph_cap *ceph_get_cap_for_mds(struct ceph_inode_info *ci, int mds)
332{
333 struct ceph_cap *cap;
334
335 spin_lock(&ci->i_ceph_lock);
336 cap = __get_cap_for_mds(ci, mds);
337 spin_unlock(&ci->i_ceph_lock);
338 return cap;
339}
340
341/*
342 * Return id of any MDS with a cap, preferably FILE_WR|BUFFER|EXCL, else -1.
343 */
344static int __ceph_get_cap_mds(struct ceph_inode_info *ci)
345{
346 struct ceph_cap *cap;
347 int mds = -1;
348 struct rb_node *p;
349
350 /* prefer mds with WR|BUFFER|EXCL caps */
351 for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
352 cap = rb_entry(p, struct ceph_cap, ci_node);
353 mds = cap->mds;
354 if (cap->issued & (CEPH_CAP_FILE_WR |
355 CEPH_CAP_FILE_BUFFER |
356 CEPH_CAP_FILE_EXCL))
357 break;
358 }
359 return mds;
360}
361
362int ceph_get_cap_mds(struct inode *inode)
363{
364 struct ceph_inode_info *ci = ceph_inode(inode);
365 int mds;
366 spin_lock(&ci->i_ceph_lock);
367 mds = __ceph_get_cap_mds(ceph_inode(inode));
368 spin_unlock(&ci->i_ceph_lock);
369 return mds;
370}
371
372/*
373 * Called under i_ceph_lock.
374 */
375static void __insert_cap_node(struct ceph_inode_info *ci,
376 struct ceph_cap *new)
377{
378 struct rb_node **p = &ci->i_caps.rb_node;
379 struct rb_node *parent = NULL;
380 struct ceph_cap *cap = NULL;
381
382 while (*p) {
383 parent = *p;
384 cap = rb_entry(parent, struct ceph_cap, ci_node);
385 if (new->mds < cap->mds)
386 p = &(*p)->rb_left;
387 else if (new->mds > cap->mds)
388 p = &(*p)->rb_right;
389 else
390 BUG();
391 }
392
393 rb_link_node(&new->ci_node, parent, p);
394 rb_insert_color(&new->ci_node, &ci->i_caps);
395}
396
397/*
398 * (re)set cap hold timeouts, which control the delayed release
399 * of unused caps back to the MDS. Should be called on cap use.
400 */
401static void __cap_set_timeouts(struct ceph_mds_client *mdsc,
402 struct ceph_inode_info *ci)
403{
404 struct ceph_mount_options *ma = mdsc->fsc->mount_options;
405
406 ci->i_hold_caps_min = round_jiffies(jiffies +
407 ma->caps_wanted_delay_min * HZ);
408 ci->i_hold_caps_max = round_jiffies(jiffies +
409 ma->caps_wanted_delay_max * HZ);
410 dout("__cap_set_timeouts %p min %lu max %lu\n", &ci->vfs_inode,
411 ci->i_hold_caps_min - jiffies, ci->i_hold_caps_max - jiffies);
412}
413
414/*
415 * (Re)queue cap at the end of the delayed cap release list.
416 *
417 * If I_FLUSH is set, leave the inode at the front of the list.
418 *
419 * Caller holds i_ceph_lock
420 * -> we take mdsc->cap_delay_lock
421 */
422static void __cap_delay_requeue(struct ceph_mds_client *mdsc,
423 struct ceph_inode_info *ci)
424{
425 __cap_set_timeouts(mdsc, ci);
426 dout("__cap_delay_requeue %p flags %d at %lu\n", &ci->vfs_inode,
427 ci->i_ceph_flags, ci->i_hold_caps_max);
428 if (!mdsc->stopping) {
429 spin_lock(&mdsc->cap_delay_lock);
430 if (!list_empty(&ci->i_cap_delay_list)) {
431 if (ci->i_ceph_flags & CEPH_I_FLUSH)
432 goto no_change;
433 list_del_init(&ci->i_cap_delay_list);
434 }
435 list_add_tail(&ci->i_cap_delay_list, &mdsc->cap_delay_list);
436no_change:
437 spin_unlock(&mdsc->cap_delay_lock);
438 }
439}
440
441/*
442 * Queue an inode for immediate writeback. Mark inode with I_FLUSH,
443 * indicating we should send a cap message to flush dirty metadata
444 * asap, and move to the front of the delayed cap list.
445 */
446static void __cap_delay_requeue_front(struct ceph_mds_client *mdsc,
447 struct ceph_inode_info *ci)
448{
449 dout("__cap_delay_requeue_front %p\n", &ci->vfs_inode);
450 spin_lock(&mdsc->cap_delay_lock);
451 ci->i_ceph_flags |= CEPH_I_FLUSH;
452 if (!list_empty(&ci->i_cap_delay_list))
453 list_del_init(&ci->i_cap_delay_list);
454 list_add(&ci->i_cap_delay_list, &mdsc->cap_delay_list);
455 spin_unlock(&mdsc->cap_delay_lock);
456}
457
458/*
459 * Cancel delayed work on cap.
460 *
461 * Caller must hold i_ceph_lock.
462 */
463static void __cap_delay_cancel(struct ceph_mds_client *mdsc,
464 struct ceph_inode_info *ci)
465{
466 dout("__cap_delay_cancel %p\n", &ci->vfs_inode);
467 if (list_empty(&ci->i_cap_delay_list))
468 return;
469 spin_lock(&mdsc->cap_delay_lock);
470 list_del_init(&ci->i_cap_delay_list);
471 spin_unlock(&mdsc->cap_delay_lock);
472}
473
474/*
475 * Common issue checks for add_cap, handle_cap_grant.
476 */
477static void __check_cap_issue(struct ceph_inode_info *ci, struct ceph_cap *cap,
478 unsigned issued)
479{
480 unsigned had = __ceph_caps_issued(ci, NULL);
481
482 /*
483 * Each time we receive FILE_CACHE anew, we increment
484 * i_rdcache_gen.
485 */
486 if ((issued & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) &&
487 (had & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) == 0)
488 ci->i_rdcache_gen++;
489
490 /*
491 * if we are newly issued FILE_SHARED, clear D_COMPLETE; we
492 * don't know what happened to this directory while we didn't
493 * have the cap.
494 */
495 if ((issued & CEPH_CAP_FILE_SHARED) &&
496 (had & CEPH_CAP_FILE_SHARED) == 0) {
497 ci->i_shared_gen++;
498 if (S_ISDIR(ci->vfs_inode.i_mode))
499 ceph_dir_clear_complete(&ci->vfs_inode);
500 }
501}
502
503/*
504 * Add a capability under the given MDS session.
505 *
506 * Caller should hold session snap_rwsem (read) and s_mutex.
507 *
508 * @fmode is the open file mode, if we are opening a file, otherwise
509 * it is < 0. (This is so we can atomically add the cap and add an
510 * open file reference to it.)
511 */
512int ceph_add_cap(struct inode *inode,
513 struct ceph_mds_session *session, u64 cap_id,
514 int fmode, unsigned issued, unsigned wanted,
515 unsigned seq, unsigned mseq, u64 realmino, int flags,
516 struct ceph_cap_reservation *caps_reservation)
517{
518 struct ceph_mds_client *mdsc = ceph_inode_to_client(inode)->mdsc;
519 struct ceph_inode_info *ci = ceph_inode(inode);
520 struct ceph_cap *new_cap = NULL;
521 struct ceph_cap *cap;
522 int mds = session->s_mds;
523 int actual_wanted;
524
525 dout("add_cap %p mds%d cap %llx %s seq %d\n", inode,
526 session->s_mds, cap_id, ceph_cap_string(issued), seq);
527
528 /*
529 * If we are opening the file, include file mode wanted bits
530 * in wanted.
531 */
532 if (fmode >= 0)
533 wanted |= ceph_caps_for_mode(fmode);
534
535retry:
536 spin_lock(&ci->i_ceph_lock);
537 cap = __get_cap_for_mds(ci, mds);
538 if (!cap) {
539 if (new_cap) {
540 cap = new_cap;
541 new_cap = NULL;
542 } else {
543 spin_unlock(&ci->i_ceph_lock);
544 new_cap = get_cap(mdsc, caps_reservation);
545 if (new_cap == NULL)
546 return -ENOMEM;
547 goto retry;
548 }
549
550 cap->issued = 0;
551 cap->implemented = 0;
552 cap->mds = mds;
553 cap->mds_wanted = 0;
554
555 cap->ci = ci;
556 __insert_cap_node(ci, cap);
557
558 /* clear out old exporting info? (i.e. on cap import) */
559 if (ci->i_cap_exporting_mds == mds) {
560 ci->i_cap_exporting_issued = 0;
561 ci->i_cap_exporting_mseq = 0;
562 ci->i_cap_exporting_mds = -1;
563 }
564
565 /* add to session cap list */
566 cap->session = session;
567 spin_lock(&session->s_cap_lock);
568 list_add_tail(&cap->session_caps, &session->s_caps);
569 session->s_nr_caps++;
570 spin_unlock(&session->s_cap_lock);
571 } else if (new_cap)
572 ceph_put_cap(mdsc, new_cap);
573
574 if (!ci->i_snap_realm) {
575 /*
576 * add this inode to the appropriate snap realm
577 */
578 struct ceph_snap_realm *realm = ceph_lookup_snap_realm(mdsc,
579 realmino);
580 if (realm) {
581 ceph_get_snap_realm(mdsc, realm);
582 spin_lock(&realm->inodes_with_caps_lock);
583 ci->i_snap_realm = realm;
584 list_add(&ci->i_snap_realm_item,
585 &realm->inodes_with_caps);
586 spin_unlock(&realm->inodes_with_caps_lock);
587 } else {
588 pr_err("ceph_add_cap: couldn't find snap realm %llx\n",
589 realmino);
590 WARN_ON(!realm);
591 }
592 }
593
594 __check_cap_issue(ci, cap, issued);
595
596 /*
597 * If we are issued caps we don't want, or the mds' wanted
598 * value appears to be off, queue a check so we'll release
599 * later and/or update the mds wanted value.
600 */
601 actual_wanted = __ceph_caps_wanted(ci);
602 if ((wanted & ~actual_wanted) ||
603 (issued & ~actual_wanted & CEPH_CAP_ANY_WR)) {
604 dout(" issued %s, mds wanted %s, actual %s, queueing\n",
605 ceph_cap_string(issued), ceph_cap_string(wanted),
606 ceph_cap_string(actual_wanted));
607 __cap_delay_requeue(mdsc, ci);
608 }
609
610 if (flags & CEPH_CAP_FLAG_AUTH)
611 ci->i_auth_cap = cap;
612 else if (ci->i_auth_cap == cap)
613 ci->i_auth_cap = NULL;
614
615 dout("add_cap inode %p (%llx.%llx) cap %p %s now %s seq %d mds%d\n",
616 inode, ceph_vinop(inode), cap, ceph_cap_string(issued),
617 ceph_cap_string(issued|cap->issued), seq, mds);
618 cap->cap_id = cap_id;
619 cap->issued = issued;
620 cap->implemented |= issued;
621 cap->mds_wanted |= wanted;
622 cap->seq = seq;
623 cap->issue_seq = seq;
624 cap->mseq = mseq;
625 cap->cap_gen = session->s_cap_gen;
626
627 if (fmode >= 0)
628 __ceph_get_fmode(ci, fmode);
629 spin_unlock(&ci->i_ceph_lock);
630 wake_up_all(&ci->i_cap_wq);
631 return 0;
632}
633
634/*
635 * Return true if cap has not timed out and belongs to the current
636 * generation of the MDS session (i.e. has not gone 'stale' due to
637 * us losing touch with the mds).
638 */
639static int __cap_is_valid(struct ceph_cap *cap)
640{
641 unsigned long ttl;
642 u32 gen;
643
644 spin_lock(&cap->session->s_gen_ttl_lock);
645 gen = cap->session->s_cap_gen;
646 ttl = cap->session->s_cap_ttl;
647 spin_unlock(&cap->session->s_gen_ttl_lock);
648
649 if (cap->cap_gen < gen || time_after_eq(jiffies, ttl)) {
650 dout("__cap_is_valid %p cap %p issued %s "
651 "but STALE (gen %u vs %u)\n", &cap->ci->vfs_inode,
652 cap, ceph_cap_string(cap->issued), cap->cap_gen, gen);
653 return 0;
654 }
655
656 return 1;
657}
658
659/*
660 * Return set of valid cap bits issued to us. Note that caps time
661 * out, and may be invalidated in bulk if the client session times out
662 * and session->s_cap_gen is bumped.
663 */
664int __ceph_caps_issued(struct ceph_inode_info *ci, int *implemented)
665{
666 int have = ci->i_snap_caps | ci->i_cap_exporting_issued;
667 struct ceph_cap *cap;
668 struct rb_node *p;
669
670 if (implemented)
671 *implemented = 0;
672 for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
673 cap = rb_entry(p, struct ceph_cap, ci_node);
674 if (!__cap_is_valid(cap))
675 continue;
676 dout("__ceph_caps_issued %p cap %p issued %s\n",
677 &ci->vfs_inode, cap, ceph_cap_string(cap->issued));
678 have |= cap->issued;
679 if (implemented)
680 *implemented |= cap->implemented;
681 }
682 return have;
683}
684
685/*
686 * Get cap bits issued by caps other than @ocap
687 */
688int __ceph_caps_issued_other(struct ceph_inode_info *ci, struct ceph_cap *ocap)
689{
690 int have = ci->i_snap_caps;
691 struct ceph_cap *cap;
692 struct rb_node *p;
693
694 for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
695 cap = rb_entry(p, struct ceph_cap, ci_node);
696 if (cap == ocap)
697 continue;
698 if (!__cap_is_valid(cap))
699 continue;
700 have |= cap->issued;
701 }
702 return have;
703}
704
705/*
706 * Move a cap to the end of the LRU (oldest caps at list head, newest
707 * at list tail).
708 */
709static void __touch_cap(struct ceph_cap *cap)
710{
711 struct ceph_mds_session *s = cap->session;
712
713 spin_lock(&s->s_cap_lock);
714 if (s->s_cap_iterator == NULL) {
715 dout("__touch_cap %p cap %p mds%d\n", &cap->ci->vfs_inode, cap,
716 s->s_mds);
717 list_move_tail(&cap->session_caps, &s->s_caps);
718 } else {
719 dout("__touch_cap %p cap %p mds%d NOP, iterating over caps\n",
720 &cap->ci->vfs_inode, cap, s->s_mds);
721 }
722 spin_unlock(&s->s_cap_lock);
723}
724
725/*
726 * Check if we hold the given mask. If so, move the cap(s) to the
727 * front of their respective LRUs. (This is the preferred way for
728 * callers to check for caps they want.)
729 */
730int __ceph_caps_issued_mask(struct ceph_inode_info *ci, int mask, int touch)
731{
732 struct ceph_cap *cap;
733 struct rb_node *p;
734 int have = ci->i_snap_caps;
735
736 if ((have & mask) == mask) {
737 dout("__ceph_caps_issued_mask %p snap issued %s"
738 " (mask %s)\n", &ci->vfs_inode,
739 ceph_cap_string(have),
740 ceph_cap_string(mask));
741 return 1;
742 }
743
744 for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
745 cap = rb_entry(p, struct ceph_cap, ci_node);
746 if (!__cap_is_valid(cap))
747 continue;
748 if ((cap->issued & mask) == mask) {
749 dout("__ceph_caps_issued_mask %p cap %p issued %s"
750 " (mask %s)\n", &ci->vfs_inode, cap,
751 ceph_cap_string(cap->issued),
752 ceph_cap_string(mask));
753 if (touch)
754 __touch_cap(cap);
755 return 1;
756 }
757
758 /* does a combination of caps satisfy mask? */
759 have |= cap->issued;
760 if ((have & mask) == mask) {
761 dout("__ceph_caps_issued_mask %p combo issued %s"
762 " (mask %s)\n", &ci->vfs_inode,
763 ceph_cap_string(cap->issued),
764 ceph_cap_string(mask));
765 if (touch) {
766 struct rb_node *q;
767
768 /* touch this + preceding caps */
769 __touch_cap(cap);
770 for (q = rb_first(&ci->i_caps); q != p;
771 q = rb_next(q)) {
772 cap = rb_entry(q, struct ceph_cap,
773 ci_node);
774 if (!__cap_is_valid(cap))
775 continue;
776 __touch_cap(cap);
777 }
778 }
779 return 1;
780 }
781 }
782
783 return 0;
784}
785
786/*
787 * Return true if mask caps are currently being revoked by an MDS.
788 */
789int ceph_caps_revoking(struct ceph_inode_info *ci, int mask)
790{
791 struct inode *inode = &ci->vfs_inode;
792 struct ceph_cap *cap;
793 struct rb_node *p;
794 int ret = 0;
795
796 spin_lock(&ci->i_ceph_lock);
797 for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
798 cap = rb_entry(p, struct ceph_cap, ci_node);
799 if (__cap_is_valid(cap) &&
800 (cap->implemented & ~cap->issued & mask)) {
801 ret = 1;
802 break;
803 }
804 }
805 spin_unlock(&ci->i_ceph_lock);
806 dout("ceph_caps_revoking %p %s = %d\n", inode,
807 ceph_cap_string(mask), ret);
808 return ret;
809}
810
811int __ceph_caps_used(struct ceph_inode_info *ci)
812{
813 int used = 0;
814 if (ci->i_pin_ref)
815 used |= CEPH_CAP_PIN;
816 if (ci->i_rd_ref)
817 used |= CEPH_CAP_FILE_RD;
818 if (ci->i_rdcache_ref || ci->vfs_inode.i_data.nrpages)
819 used |= CEPH_CAP_FILE_CACHE;
820 if (ci->i_wr_ref)
821 used |= CEPH_CAP_FILE_WR;
822 if (ci->i_wb_ref || ci->i_wrbuffer_ref)
823 used |= CEPH_CAP_FILE_BUFFER;
824 return used;
825}
826
827/*
828 * wanted, by virtue of open file modes
829 */
830int __ceph_caps_file_wanted(struct ceph_inode_info *ci)
831{
832 int want = 0;
833 int mode;
834 for (mode = 0; mode < CEPH_FILE_MODE_NUM; mode++)
835 if (ci->i_nr_by_mode[mode])
836 want |= ceph_caps_for_mode(mode);
837 return want;
838}
839
840/*
841 * Return caps we have registered with the MDS(s) as 'wanted'.
842 */
843int __ceph_caps_mds_wanted(struct ceph_inode_info *ci)
844{
845 struct ceph_cap *cap;
846 struct rb_node *p;
847 int mds_wanted = 0;
848
849 for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
850 cap = rb_entry(p, struct ceph_cap, ci_node);
851 if (!__cap_is_valid(cap))
852 continue;
853 mds_wanted |= cap->mds_wanted;
854 }
855 return mds_wanted;
856}
857
858/*
859 * called under i_ceph_lock
860 */
861static int __ceph_is_any_caps(struct ceph_inode_info *ci)
862{
863 return !RB_EMPTY_ROOT(&ci->i_caps) || ci->i_cap_exporting_mds >= 0;
864}
865
866/*
867 * Remove a cap. Take steps to deal with a racing iterate_session_caps.
868 *
869 * caller should hold i_ceph_lock.
870 * caller will not hold session s_mutex if called from destroy_inode.
871 */
872void __ceph_remove_cap(struct ceph_cap *cap)
873{
874 struct ceph_mds_session *session = cap->session;
875 struct ceph_inode_info *ci = cap->ci;
876 struct ceph_mds_client *mdsc =
877 ceph_sb_to_client(ci->vfs_inode.i_sb)->mdsc;
878 int removed = 0;
879
880 dout("__ceph_remove_cap %p from %p\n", cap, &ci->vfs_inode);
881
882 /* remove from session list */
883 spin_lock(&session->s_cap_lock);
884 if (session->s_cap_iterator == cap) {
885 /* not yet, we are iterating over this very cap */
886 dout("__ceph_remove_cap delaying %p removal from session %p\n",
887 cap, cap->session);
888 } else {
889 list_del_init(&cap->session_caps);
890 session->s_nr_caps--;
891 cap->session = NULL;
892 removed = 1;
893 }
894 /* protect backpointer with s_cap_lock: see iterate_session_caps */
895 cap->ci = NULL;
896 spin_unlock(&session->s_cap_lock);
897
898 /* remove from inode list */
899 rb_erase(&cap->ci_node, &ci->i_caps);
900 if (ci->i_auth_cap == cap)
901 ci->i_auth_cap = NULL;
902
903 if (removed)
904 ceph_put_cap(mdsc, cap);
905
906 if (!__ceph_is_any_caps(ci) && ci->i_snap_realm) {
907 struct ceph_snap_realm *realm = ci->i_snap_realm;
908 spin_lock(&realm->inodes_with_caps_lock);
909 list_del_init(&ci->i_snap_realm_item);
910 ci->i_snap_realm_counter++;
911 ci->i_snap_realm = NULL;
912 spin_unlock(&realm->inodes_with_caps_lock);
913 ceph_put_snap_realm(mdsc, realm);
914 }
915 if (!__ceph_is_any_real_caps(ci))
916 __cap_delay_cancel(mdsc, ci);
917}
918
919/*
920 * Build and send a cap message to the given MDS.
921 *
922 * Caller should be holding s_mutex.
923 */
924static int send_cap_msg(struct ceph_mds_session *session,
925 u64 ino, u64 cid, int op,
926 int caps, int wanted, int dirty,
927 u32 seq, u64 flush_tid, u32 issue_seq, u32 mseq,
928 u64 size, u64 max_size,
929 struct timespec *mtime, struct timespec *atime,
930 u64 time_warp_seq,
931 uid_t uid, gid_t gid, umode_t mode,
932 u64 xattr_version,
933 struct ceph_buffer *xattrs_buf,
934 u64 follows)
935{
936 struct ceph_mds_caps *fc;
937 struct ceph_msg *msg;
938
939 dout("send_cap_msg %s %llx %llx caps %s wanted %s dirty %s"
940 " seq %u/%u mseq %u follows %lld size %llu/%llu"
941 " xattr_ver %llu xattr_len %d\n", ceph_cap_op_name(op),
942 cid, ino, ceph_cap_string(caps), ceph_cap_string(wanted),
943 ceph_cap_string(dirty),
944 seq, issue_seq, mseq, follows, size, max_size,
945 xattr_version, xattrs_buf ? (int)xattrs_buf->vec.iov_len : 0);
946
947 msg = ceph_msg_new(CEPH_MSG_CLIENT_CAPS, sizeof(*fc), GFP_NOFS, false);
948 if (!msg)
949 return -ENOMEM;
950
951 msg->hdr.tid = cpu_to_le64(flush_tid);
952
953 fc = msg->front.iov_base;
954 memset(fc, 0, sizeof(*fc));
955
956 fc->cap_id = cpu_to_le64(cid);
957 fc->op = cpu_to_le32(op);
958 fc->seq = cpu_to_le32(seq);
959 fc->issue_seq = cpu_to_le32(issue_seq);
960 fc->migrate_seq = cpu_to_le32(mseq);
961 fc->caps = cpu_to_le32(caps);
962 fc->wanted = cpu_to_le32(wanted);
963 fc->dirty = cpu_to_le32(dirty);
964 fc->ino = cpu_to_le64(ino);
965 fc->snap_follows = cpu_to_le64(follows);
966
967 fc->size = cpu_to_le64(size);
968 fc->max_size = cpu_to_le64(max_size);
969 if (mtime)
970 ceph_encode_timespec(&fc->mtime, mtime);
971 if (atime)
972 ceph_encode_timespec(&fc->atime, atime);
973 fc->time_warp_seq = cpu_to_le32(time_warp_seq);
974
975 fc->uid = cpu_to_le32(uid);
976 fc->gid = cpu_to_le32(gid);
977 fc->mode = cpu_to_le32(mode);
978
979 fc->xattr_version = cpu_to_le64(xattr_version);
980 if (xattrs_buf) {
981 msg->middle = ceph_buffer_get(xattrs_buf);
982 fc->xattr_len = cpu_to_le32(xattrs_buf->vec.iov_len);
983 msg->hdr.middle_len = cpu_to_le32(xattrs_buf->vec.iov_len);
984 }
985
986 ceph_con_send(&session->s_con, msg);
987 return 0;
988}
989
990static void __queue_cap_release(struct ceph_mds_session *session,
991 u64 ino, u64 cap_id, u32 migrate_seq,
992 u32 issue_seq)
993{
994 struct ceph_msg *msg;
995 struct ceph_mds_cap_release *head;
996 struct ceph_mds_cap_item *item;
997
998 spin_lock(&session->s_cap_lock);
999 BUG_ON(!session->s_num_cap_releases);
1000 msg = list_first_entry(&session->s_cap_releases,
1001 struct ceph_msg, list_head);
1002
1003 dout(" adding %llx release to mds%d msg %p (%d left)\n",
1004 ino, session->s_mds, msg, session->s_num_cap_releases);
1005
1006 BUG_ON(msg->front.iov_len + sizeof(*item) > PAGE_CACHE_SIZE);
1007 head = msg->front.iov_base;
1008 head->num = cpu_to_le32(le32_to_cpu(head->num) + 1);
1009 item = msg->front.iov_base + msg->front.iov_len;
1010 item->ino = cpu_to_le64(ino);
1011 item->cap_id = cpu_to_le64(cap_id);
1012 item->migrate_seq = cpu_to_le32(migrate_seq);
1013 item->seq = cpu_to_le32(issue_seq);
1014
1015 session->s_num_cap_releases--;
1016
1017 msg->front.iov_len += sizeof(*item);
1018 if (le32_to_cpu(head->num) == CEPH_CAPS_PER_RELEASE) {
1019 dout(" release msg %p full\n", msg);
1020 list_move_tail(&msg->list_head, &session->s_cap_releases_done);
1021 } else {
1022 dout(" release msg %p at %d/%d (%d)\n", msg,
1023 (int)le32_to_cpu(head->num),
1024 (int)CEPH_CAPS_PER_RELEASE,
1025 (int)msg->front.iov_len);
1026 }
1027 spin_unlock(&session->s_cap_lock);
1028}
1029
1030/*
1031 * Queue cap releases when an inode is dropped from our cache. Since
1032 * inode is about to be destroyed, there is no need for i_ceph_lock.
1033 */
1034void ceph_queue_caps_release(struct inode *inode)
1035{
1036 struct ceph_inode_info *ci = ceph_inode(inode);
1037 struct rb_node *p;
1038
1039 p = rb_first(&ci->i_caps);
1040 while (p) {
1041 struct ceph_cap *cap = rb_entry(p, struct ceph_cap, ci_node);
1042 struct ceph_mds_session *session = cap->session;
1043
1044 __queue_cap_release(session, ceph_ino(inode), cap->cap_id,
1045 cap->mseq, cap->issue_seq);
1046 p = rb_next(p);
1047 __ceph_remove_cap(cap);
1048 }
1049}
1050
1051/*
1052 * Send a cap msg on the given inode. Update our caps state, then
1053 * drop i_ceph_lock and send the message.
1054 *
1055 * Make note of max_size reported/requested from mds, revoked caps
1056 * that have now been implemented.
1057 *
1058 * Make half-hearted attempt ot to invalidate page cache if we are
1059 * dropping RDCACHE. Note that this will leave behind locked pages
1060 * that we'll then need to deal with elsewhere.
1061 *
1062 * Return non-zero if delayed release, or we experienced an error
1063 * such that the caller should requeue + retry later.
1064 *
1065 * called with i_ceph_lock, then drops it.
1066 * caller should hold snap_rwsem (read), s_mutex.
1067 */
1068static int __send_cap(struct ceph_mds_client *mdsc, struct ceph_cap *cap,
1069 int op, int used, int want, int retain, int flushing,
1070 unsigned *pflush_tid)
1071 __releases(cap->ci->i_ceph_lock)
1072{
1073 struct ceph_inode_info *ci = cap->ci;
1074 struct inode *inode = &ci->vfs_inode;
1075 u64 cap_id = cap->cap_id;
1076 int held, revoking, dropping, keep;
1077 u64 seq, issue_seq, mseq, time_warp_seq, follows;
1078 u64 size, max_size;
1079 struct timespec mtime, atime;
1080 int wake = 0;
1081 umode_t mode;
1082 uid_t uid;
1083 gid_t gid;
1084 struct ceph_mds_session *session;
1085 u64 xattr_version = 0;
1086 struct ceph_buffer *xattr_blob = NULL;
1087 int delayed = 0;
1088 u64 flush_tid = 0;
1089 int i;
1090 int ret;
1091
1092 held = cap->issued | cap->implemented;
1093 revoking = cap->implemented & ~cap->issued;
1094 retain &= ~revoking;
1095 dropping = cap->issued & ~retain;
1096
1097 dout("__send_cap %p cap %p session %p %s -> %s (revoking %s)\n",
1098 inode, cap, cap->session,
1099 ceph_cap_string(held), ceph_cap_string(held & retain),
1100 ceph_cap_string(revoking));
1101 BUG_ON((retain & CEPH_CAP_PIN) == 0);
1102
1103 session = cap->session;
1104
1105 /* don't release wanted unless we've waited a bit. */
1106 if ((ci->i_ceph_flags & CEPH_I_NODELAY) == 0 &&
1107 time_before(jiffies, ci->i_hold_caps_min)) {
1108 dout(" delaying issued %s -> %s, wanted %s -> %s on send\n",
1109 ceph_cap_string(cap->issued),
1110 ceph_cap_string(cap->issued & retain),
1111 ceph_cap_string(cap->mds_wanted),
1112 ceph_cap_string(want));
1113 want |= cap->mds_wanted;
1114 retain |= cap->issued;
1115 delayed = 1;
1116 }
1117 ci->i_ceph_flags &= ~(CEPH_I_NODELAY | CEPH_I_FLUSH);
1118
1119 cap->issued &= retain; /* drop bits we don't want */
1120 if (cap->implemented & ~cap->issued) {
1121 /*
1122 * Wake up any waiters on wanted -> needed transition.
1123 * This is due to the weird transition from buffered
1124 * to sync IO... we need to flush dirty pages _before_
1125 * allowing sync writes to avoid reordering.
1126 */
1127 wake = 1;
1128 }
1129 cap->implemented &= cap->issued | used;
1130 cap->mds_wanted = want;
1131
1132 if (flushing) {
1133 /*
1134 * assign a tid for flush operations so we can avoid
1135 * flush1 -> dirty1 -> flush2 -> flushack1 -> mark
1136 * clean type races. track latest tid for every bit
1137 * so we can handle flush AxFw, flush Fw, and have the
1138 * first ack clean Ax.
1139 */
1140 flush_tid = ++ci->i_cap_flush_last_tid;
1141 if (pflush_tid)
1142 *pflush_tid = flush_tid;
1143 dout(" cap_flush_tid %d\n", (int)flush_tid);
1144 for (i = 0; i < CEPH_CAP_BITS; i++)
1145 if (flushing & (1 << i))
1146 ci->i_cap_flush_tid[i] = flush_tid;
1147
1148 follows = ci->i_head_snapc->seq;
1149 } else {
1150 follows = 0;
1151 }
1152
1153 keep = cap->implemented;
1154 seq = cap->seq;
1155 issue_seq = cap->issue_seq;
1156 mseq = cap->mseq;
1157 size = inode->i_size;
1158 ci->i_reported_size = size;
1159 max_size = ci->i_wanted_max_size;
1160 ci->i_requested_max_size = max_size;
1161 mtime = inode->i_mtime;
1162 atime = inode->i_atime;
1163 time_warp_seq = ci->i_time_warp_seq;
1164 uid = inode->i_uid;
1165 gid = inode->i_gid;
1166 mode = inode->i_mode;
1167
1168 if (flushing & CEPH_CAP_XATTR_EXCL) {
1169 __ceph_build_xattrs_blob(ci);
1170 xattr_blob = ci->i_xattrs.blob;
1171 xattr_version = ci->i_xattrs.version;
1172 }
1173
1174 spin_unlock(&ci->i_ceph_lock);
1175
1176 ret = send_cap_msg(session, ceph_vino(inode).ino, cap_id,
1177 op, keep, want, flushing, seq, flush_tid, issue_seq, mseq,
1178 size, max_size, &mtime, &atime, time_warp_seq,
1179 uid, gid, mode, xattr_version, xattr_blob,
1180 follows);
1181 if (ret < 0) {
1182 dout("error sending cap msg, must requeue %p\n", inode);
1183 delayed = 1;
1184 }
1185
1186 if (wake)
1187 wake_up_all(&ci->i_cap_wq);
1188
1189 return delayed;
1190}
1191
1192/*
1193 * When a snapshot is taken, clients accumulate dirty metadata on
1194 * inodes with capabilities in ceph_cap_snaps to describe the file
1195 * state at the time the snapshot was taken. This must be flushed
1196 * asynchronously back to the MDS once sync writes complete and dirty
1197 * data is written out.
1198 *
1199 * Unless @again is true, skip cap_snaps that were already sent to
1200 * the MDS (i.e., during this session).
1201 *
1202 * Called under i_ceph_lock. Takes s_mutex as needed.
1203 */
1204void __ceph_flush_snaps(struct ceph_inode_info *ci,
1205 struct ceph_mds_session **psession,
1206 int again)
1207 __releases(ci->i_ceph_lock)
1208 __acquires(ci->i_ceph_lock)
1209{
1210 struct inode *inode = &ci->vfs_inode;
1211 int mds;
1212 struct ceph_cap_snap *capsnap;
1213 u32 mseq;
1214 struct ceph_mds_client *mdsc = ceph_inode_to_client(inode)->mdsc;
1215 struct ceph_mds_session *session = NULL; /* if session != NULL, we hold
1216 session->s_mutex */
1217 u64 next_follows = 0; /* keep track of how far we've gotten through the
1218 i_cap_snaps list, and skip these entries next time
1219 around to avoid an infinite loop */
1220
1221 if (psession)
1222 session = *psession;
1223
1224 dout("__flush_snaps %p\n", inode);
1225retry:
1226 list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) {
1227 /* avoid an infiniute loop after retry */
1228 if (capsnap->follows < next_follows)
1229 continue;
1230 /*
1231 * we need to wait for sync writes to complete and for dirty
1232 * pages to be written out.
1233 */
1234 if (capsnap->dirty_pages || capsnap->writing)
1235 break;
1236
1237 /*
1238 * if cap writeback already occurred, we should have dropped
1239 * the capsnap in ceph_put_wrbuffer_cap_refs.
1240 */
1241 BUG_ON(capsnap->dirty == 0);
1242
1243 /* pick mds, take s_mutex */
1244 if (ci->i_auth_cap == NULL) {
1245 dout("no auth cap (migrating?), doing nothing\n");
1246 goto out;
1247 }
1248
1249 /* only flush each capsnap once */
1250 if (!again && !list_empty(&capsnap->flushing_item)) {
1251 dout("already flushed %p, skipping\n", capsnap);
1252 continue;
1253 }
1254
1255 mds = ci->i_auth_cap->session->s_mds;
1256 mseq = ci->i_auth_cap->mseq;
1257
1258 if (session && session->s_mds != mds) {
1259 dout("oops, wrong session %p mutex\n", session);
1260 mutex_unlock(&session->s_mutex);
1261 ceph_put_mds_session(session);
1262 session = NULL;
1263 }
1264 if (!session) {
1265 spin_unlock(&ci->i_ceph_lock);
1266 mutex_lock(&mdsc->mutex);
1267 session = __ceph_lookup_mds_session(mdsc, mds);
1268 mutex_unlock(&mdsc->mutex);
1269 if (session) {
1270 dout("inverting session/ino locks on %p\n",
1271 session);
1272 mutex_lock(&session->s_mutex);
1273 }
1274 /*
1275 * if session == NULL, we raced against a cap
1276 * deletion or migration. retry, and we'll
1277 * get a better @mds value next time.
1278 */
1279 spin_lock(&ci->i_ceph_lock);
1280 goto retry;
1281 }
1282
1283 capsnap->flush_tid = ++ci->i_cap_flush_last_tid;
1284 atomic_inc(&capsnap->nref);
1285 if (!list_empty(&capsnap->flushing_item))
1286 list_del_init(&capsnap->flushing_item);
1287 list_add_tail(&capsnap->flushing_item,
1288 &session->s_cap_snaps_flushing);
1289 spin_unlock(&ci->i_ceph_lock);
1290
1291 dout("flush_snaps %p cap_snap %p follows %lld tid %llu\n",
1292 inode, capsnap, capsnap->follows, capsnap->flush_tid);
1293 send_cap_msg(session, ceph_vino(inode).ino, 0,
1294 CEPH_CAP_OP_FLUSHSNAP, capsnap->issued, 0,
1295 capsnap->dirty, 0, capsnap->flush_tid, 0, mseq,
1296 capsnap->size, 0,
1297 &capsnap->mtime, &capsnap->atime,
1298 capsnap->time_warp_seq,
1299 capsnap->uid, capsnap->gid, capsnap->mode,
1300 capsnap->xattr_version, capsnap->xattr_blob,
1301 capsnap->follows);
1302
1303 next_follows = capsnap->follows + 1;
1304 ceph_put_cap_snap(capsnap);
1305
1306 spin_lock(&ci->i_ceph_lock);
1307 goto retry;
1308 }
1309
1310 /* we flushed them all; remove this inode from the queue */
1311 spin_lock(&mdsc->snap_flush_lock);
1312 list_del_init(&ci->i_snap_flush_item);
1313 spin_unlock(&mdsc->snap_flush_lock);
1314
1315out:
1316 if (psession)
1317 *psession = session;
1318 else if (session) {
1319 mutex_unlock(&session->s_mutex);
1320 ceph_put_mds_session(session);
1321 }
1322}
1323
1324static void ceph_flush_snaps(struct ceph_inode_info *ci)
1325{
1326 spin_lock(&ci->i_ceph_lock);
1327 __ceph_flush_snaps(ci, NULL, 0);
1328 spin_unlock(&ci->i_ceph_lock);
1329}
1330
1331/*
1332 * Mark caps dirty. If inode is newly dirty, return the dirty flags.
1333 * Caller is then responsible for calling __mark_inode_dirty with the
1334 * returned flags value.
1335 */
1336int __ceph_mark_dirty_caps(struct ceph_inode_info *ci, int mask)
1337{
1338 struct ceph_mds_client *mdsc =
1339 ceph_sb_to_client(ci->vfs_inode.i_sb)->mdsc;
1340 struct inode *inode = &ci->vfs_inode;
1341 int was = ci->i_dirty_caps;
1342 int dirty = 0;
1343
1344 dout("__mark_dirty_caps %p %s dirty %s -> %s\n", &ci->vfs_inode,
1345 ceph_cap_string(mask), ceph_cap_string(was),
1346 ceph_cap_string(was | mask));
1347 ci->i_dirty_caps |= mask;
1348 if (was == 0) {
1349 if (!ci->i_head_snapc)
1350 ci->i_head_snapc = ceph_get_snap_context(
1351 ci->i_snap_realm->cached_context);
1352 dout(" inode %p now dirty snapc %p\n", &ci->vfs_inode,
1353 ci->i_head_snapc);
1354 BUG_ON(!list_empty(&ci->i_dirty_item));
1355 spin_lock(&mdsc->cap_dirty_lock);
1356 list_add(&ci->i_dirty_item, &mdsc->cap_dirty);
1357 spin_unlock(&mdsc->cap_dirty_lock);
1358 if (ci->i_flushing_caps == 0) {
1359 ihold(inode);
1360 dirty |= I_DIRTY_SYNC;
1361 }
1362 }
1363 BUG_ON(list_empty(&ci->i_dirty_item));
1364 if (((was | ci->i_flushing_caps) & CEPH_CAP_FILE_BUFFER) &&
1365 (mask & CEPH_CAP_FILE_BUFFER))
1366 dirty |= I_DIRTY_DATASYNC;
1367 __cap_delay_requeue(mdsc, ci);
1368 return dirty;
1369}
1370
1371/*
1372 * Add dirty inode to the flushing list. Assigned a seq number so we
1373 * can wait for caps to flush without starving.
1374 *
1375 * Called under i_ceph_lock.
1376 */
1377static int __mark_caps_flushing(struct inode *inode,
1378 struct ceph_mds_session *session)
1379{
1380 struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
1381 struct ceph_inode_info *ci = ceph_inode(inode);
1382 int flushing;
1383
1384 BUG_ON(ci->i_dirty_caps == 0);
1385 BUG_ON(list_empty(&ci->i_dirty_item));
1386
1387 flushing = ci->i_dirty_caps;
1388 dout("__mark_caps_flushing flushing %s, flushing_caps %s -> %s\n",
1389 ceph_cap_string(flushing),
1390 ceph_cap_string(ci->i_flushing_caps),
1391 ceph_cap_string(ci->i_flushing_caps | flushing));
1392 ci->i_flushing_caps |= flushing;
1393 ci->i_dirty_caps = 0;
1394 dout(" inode %p now !dirty\n", inode);
1395
1396 spin_lock(&mdsc->cap_dirty_lock);
1397 list_del_init(&ci->i_dirty_item);
1398
1399 ci->i_cap_flush_seq = ++mdsc->cap_flush_seq;
1400 if (list_empty(&ci->i_flushing_item)) {
1401 list_add_tail(&ci->i_flushing_item, &session->s_cap_flushing);
1402 mdsc->num_cap_flushing++;
1403 dout(" inode %p now flushing seq %lld\n", inode,
1404 ci->i_cap_flush_seq);
1405 } else {
1406 list_move_tail(&ci->i_flushing_item, &session->s_cap_flushing);
1407 dout(" inode %p now flushing (more) seq %lld\n", inode,
1408 ci->i_cap_flush_seq);
1409 }
1410 spin_unlock(&mdsc->cap_dirty_lock);
1411
1412 return flushing;
1413}
1414
1415/*
1416 * try to invalidate mapping pages without blocking.
1417 */
1418static int try_nonblocking_invalidate(struct inode *inode)
1419{
1420 struct ceph_inode_info *ci = ceph_inode(inode);
1421 u32 invalidating_gen = ci->i_rdcache_gen;
1422
1423 spin_unlock(&ci->i_ceph_lock);
1424 invalidate_mapping_pages(&inode->i_data, 0, -1);
1425 spin_lock(&ci->i_ceph_lock);
1426
1427 if (inode->i_data.nrpages == 0 &&
1428 invalidating_gen == ci->i_rdcache_gen) {
1429 /* success. */
1430 dout("try_nonblocking_invalidate %p success\n", inode);
1431 /* save any racing async invalidate some trouble */
1432 ci->i_rdcache_revoking = ci->i_rdcache_gen - 1;
1433 return 0;
1434 }
1435 dout("try_nonblocking_invalidate %p failed\n", inode);
1436 return -1;
1437}
1438
1439/*
1440 * Swiss army knife function to examine currently used and wanted
1441 * versus held caps. Release, flush, ack revoked caps to mds as
1442 * appropriate.
1443 *
1444 * CHECK_CAPS_NODELAY - caller is delayed work and we should not delay
1445 * cap release further.
1446 * CHECK_CAPS_AUTHONLY - we should only check the auth cap
1447 * CHECK_CAPS_FLUSH - we should flush any dirty caps immediately, without
1448 * further delay.
1449 */
1450void ceph_check_caps(struct ceph_inode_info *ci, int flags,
1451 struct ceph_mds_session *session)
1452{
1453 struct ceph_fs_client *fsc = ceph_inode_to_client(&ci->vfs_inode);
1454 struct ceph_mds_client *mdsc = fsc->mdsc;
1455 struct inode *inode = &ci->vfs_inode;
1456 struct ceph_cap *cap;
1457 int file_wanted, used;
1458 int took_snap_rwsem = 0; /* true if mdsc->snap_rwsem held */
1459 int issued, implemented, want, retain, revoking, flushing = 0;
1460 int mds = -1; /* keep track of how far we've gone through i_caps list
1461 to avoid an infinite loop on retry */
1462 struct rb_node *p;
1463 int tried_invalidate = 0;
1464 int delayed = 0, sent = 0, force_requeue = 0, num;
1465 int queue_invalidate = 0;
1466 int is_delayed = flags & CHECK_CAPS_NODELAY;
1467
1468 /* if we are unmounting, flush any unused caps immediately. */
1469 if (mdsc->stopping)
1470 is_delayed = 1;
1471
1472 spin_lock(&ci->i_ceph_lock);
1473
1474 if (ci->i_ceph_flags & CEPH_I_FLUSH)
1475 flags |= CHECK_CAPS_FLUSH;
1476
1477 /* flush snaps first time around only */
1478 if (!list_empty(&ci->i_cap_snaps))
1479 __ceph_flush_snaps(ci, &session, 0);
1480 goto retry_locked;
1481retry:
1482 spin_lock(&ci->i_ceph_lock);
1483retry_locked:
1484 file_wanted = __ceph_caps_file_wanted(ci);
1485 used = __ceph_caps_used(ci);
1486 want = file_wanted | used;
1487 issued = __ceph_caps_issued(ci, &implemented);
1488 revoking = implemented & ~issued;
1489
1490 retain = want | CEPH_CAP_PIN;
1491 if (!mdsc->stopping && inode->i_nlink > 0) {
1492 if (want) {
1493 retain |= CEPH_CAP_ANY; /* be greedy */
1494 } else {
1495 retain |= CEPH_CAP_ANY_SHARED;
1496 /*
1497 * keep RD only if we didn't have the file open RW,
1498 * because then the mds would revoke it anyway to
1499 * journal max_size=0.
1500 */
1501 if (ci->i_max_size == 0)
1502 retain |= CEPH_CAP_ANY_RD;
1503 }
1504 }
1505
1506 dout("check_caps %p file_want %s used %s dirty %s flushing %s"
1507 " issued %s revoking %s retain %s %s%s%s\n", inode,
1508 ceph_cap_string(file_wanted),
1509 ceph_cap_string(used), ceph_cap_string(ci->i_dirty_caps),
1510 ceph_cap_string(ci->i_flushing_caps),
1511 ceph_cap_string(issued), ceph_cap_string(revoking),
1512 ceph_cap_string(retain),
1513 (flags & CHECK_CAPS_AUTHONLY) ? " AUTHONLY" : "",
1514 (flags & CHECK_CAPS_NODELAY) ? " NODELAY" : "",
1515 (flags & CHECK_CAPS_FLUSH) ? " FLUSH" : "");
1516
1517 /*
1518 * If we no longer need to hold onto old our caps, and we may
1519 * have cached pages, but don't want them, then try to invalidate.
1520 * If we fail, it's because pages are locked.... try again later.
1521 */
1522 if ((!is_delayed || mdsc->stopping) &&
1523 ci->i_wrbuffer_ref == 0 && /* no dirty pages... */
1524 inode->i_data.nrpages && /* have cached pages */
1525 (file_wanted == 0 || /* no open files */
1526 (revoking & (CEPH_CAP_FILE_CACHE|
1527 CEPH_CAP_FILE_LAZYIO))) && /* or revoking cache */
1528 !tried_invalidate) {
1529 dout("check_caps trying to invalidate on %p\n", inode);
1530 if (try_nonblocking_invalidate(inode) < 0) {
1531 if (revoking & (CEPH_CAP_FILE_CACHE|
1532 CEPH_CAP_FILE_LAZYIO)) {
1533 dout("check_caps queuing invalidate\n");
1534 queue_invalidate = 1;
1535 ci->i_rdcache_revoking = ci->i_rdcache_gen;
1536 } else {
1537 dout("check_caps failed to invalidate pages\n");
1538 /* we failed to invalidate pages. check these
1539 caps again later. */
1540 force_requeue = 1;
1541 __cap_set_timeouts(mdsc, ci);
1542 }
1543 }
1544 tried_invalidate = 1;
1545 goto retry_locked;
1546 }
1547
1548 num = 0;
1549 for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
1550 cap = rb_entry(p, struct ceph_cap, ci_node);
1551 num++;
1552
1553 /* avoid looping forever */
1554 if (mds >= cap->mds ||
1555 ((flags & CHECK_CAPS_AUTHONLY) && cap != ci->i_auth_cap))
1556 continue;
1557
1558 /* NOTE: no side-effects allowed, until we take s_mutex */
1559
1560 revoking = cap->implemented & ~cap->issued;
1561 dout(" mds%d cap %p issued %s implemented %s revoking %s\n",
1562 cap->mds, cap, ceph_cap_string(cap->issued),
1563 ceph_cap_string(cap->implemented),
1564 ceph_cap_string(revoking));
1565
1566 if (cap == ci->i_auth_cap &&
1567 (cap->issued & CEPH_CAP_FILE_WR)) {
1568 /* request larger max_size from MDS? */
1569 if (ci->i_wanted_max_size > ci->i_max_size &&
1570 ci->i_wanted_max_size > ci->i_requested_max_size) {
1571 dout("requesting new max_size\n");
1572 goto ack;
1573 }
1574
1575 /* approaching file_max? */
1576 if ((inode->i_size << 1) >= ci->i_max_size &&
1577 (ci->i_reported_size << 1) < ci->i_max_size) {
1578 dout("i_size approaching max_size\n");
1579 goto ack;
1580 }
1581 }
1582 /* flush anything dirty? */
1583 if (cap == ci->i_auth_cap && (flags & CHECK_CAPS_FLUSH) &&
1584 ci->i_dirty_caps) {
1585 dout("flushing dirty caps\n");
1586 goto ack;
1587 }
1588
1589 /* completed revocation? going down and there are no caps? */
1590 if (revoking && (revoking & used) == 0) {
1591 dout("completed revocation of %s\n",
1592 ceph_cap_string(cap->implemented & ~cap->issued));
1593 goto ack;
1594 }
1595
1596 /* want more caps from mds? */
1597 if (want & ~(cap->mds_wanted | cap->issued))
1598 goto ack;
1599
1600 /* things we might delay */
1601 if ((cap->issued & ~retain) == 0 &&
1602 cap->mds_wanted == want)
1603 continue; /* nope, all good */
1604
1605 if (is_delayed)
1606 goto ack;
1607
1608 /* delay? */
1609 if ((ci->i_ceph_flags & CEPH_I_NODELAY) == 0 &&
1610 time_before(jiffies, ci->i_hold_caps_max)) {
1611 dout(" delaying issued %s -> %s, wanted %s -> %s\n",
1612 ceph_cap_string(cap->issued),
1613 ceph_cap_string(cap->issued & retain),
1614 ceph_cap_string(cap->mds_wanted),
1615 ceph_cap_string(want));
1616 delayed++;
1617 continue;
1618 }
1619
1620ack:
1621 if (ci->i_ceph_flags & CEPH_I_NOFLUSH) {
1622 dout(" skipping %p I_NOFLUSH set\n", inode);
1623 continue;
1624 }
1625
1626 if (session && session != cap->session) {
1627 dout("oops, wrong session %p mutex\n", session);
1628 mutex_unlock(&session->s_mutex);
1629 session = NULL;
1630 }
1631 if (!session) {
1632 session = cap->session;
1633 if (mutex_trylock(&session->s_mutex) == 0) {
1634 dout("inverting session/ino locks on %p\n",
1635 session);
1636 spin_unlock(&ci->i_ceph_lock);
1637 if (took_snap_rwsem) {
1638 up_read(&mdsc->snap_rwsem);
1639 took_snap_rwsem = 0;
1640 }
1641 mutex_lock(&session->s_mutex);
1642 goto retry;
1643 }
1644 }
1645 /* take snap_rwsem after session mutex */
1646 if (!took_snap_rwsem) {
1647 if (down_read_trylock(&mdsc->snap_rwsem) == 0) {
1648 dout("inverting snap/in locks on %p\n",
1649 inode);
1650 spin_unlock(&ci->i_ceph_lock);
1651 down_read(&mdsc->snap_rwsem);
1652 took_snap_rwsem = 1;
1653 goto retry;
1654 }
1655 took_snap_rwsem = 1;
1656 }
1657
1658 if (cap == ci->i_auth_cap && ci->i_dirty_caps)
1659 flushing = __mark_caps_flushing(inode, session);
1660 else
1661 flushing = 0;
1662
1663 mds = cap->mds; /* remember mds, so we don't repeat */
1664 sent++;
1665
1666 /* __send_cap drops i_ceph_lock */
1667 delayed += __send_cap(mdsc, cap, CEPH_CAP_OP_UPDATE, used, want,
1668 retain, flushing, NULL);
1669 goto retry; /* retake i_ceph_lock and restart our cap scan. */
1670 }
1671
1672 /*
1673 * Reschedule delayed caps release if we delayed anything,
1674 * otherwise cancel.
1675 */
1676 if (delayed && is_delayed)
1677 force_requeue = 1; /* __send_cap delayed release; requeue */
1678 if (!delayed && !is_delayed)
1679 __cap_delay_cancel(mdsc, ci);
1680 else if (!is_delayed || force_requeue)
1681 __cap_delay_requeue(mdsc, ci);
1682
1683 spin_unlock(&ci->i_ceph_lock);
1684
1685 if (queue_invalidate)
1686 ceph_queue_invalidate(inode);
1687
1688 if (session)
1689 mutex_unlock(&session->s_mutex);
1690 if (took_snap_rwsem)
1691 up_read(&mdsc->snap_rwsem);
1692}
1693
1694/*
1695 * Try to flush dirty caps back to the auth mds.
1696 */
1697static int try_flush_caps(struct inode *inode, struct ceph_mds_session *session,
1698 unsigned *flush_tid)
1699{
1700 struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
1701 struct ceph_inode_info *ci = ceph_inode(inode);
1702 int unlock_session = session ? 0 : 1;
1703 int flushing = 0;
1704
1705retry:
1706 spin_lock(&ci->i_ceph_lock);
1707 if (ci->i_ceph_flags & CEPH_I_NOFLUSH) {
1708 dout("try_flush_caps skipping %p I_NOFLUSH set\n", inode);
1709 goto out;
1710 }
1711 if (ci->i_dirty_caps && ci->i_auth_cap) {
1712 struct ceph_cap *cap = ci->i_auth_cap;
1713 int used = __ceph_caps_used(ci);
1714 int want = __ceph_caps_wanted(ci);
1715 int delayed;
1716
1717 if (!session) {
1718 spin_unlock(&ci->i_ceph_lock);
1719 session = cap->session;
1720 mutex_lock(&session->s_mutex);
1721 goto retry;
1722 }
1723 BUG_ON(session != cap->session);
1724 if (cap->session->s_state < CEPH_MDS_SESSION_OPEN)
1725 goto out;
1726
1727 flushing = __mark_caps_flushing(inode, session);
1728
1729 /* __send_cap drops i_ceph_lock */
1730 delayed = __send_cap(mdsc, cap, CEPH_CAP_OP_FLUSH, used, want,
1731 cap->issued | cap->implemented, flushing,
1732 flush_tid);
1733 if (!delayed)
1734 goto out_unlocked;
1735
1736 spin_lock(&ci->i_ceph_lock);
1737 __cap_delay_requeue(mdsc, ci);
1738 }
1739out:
1740 spin_unlock(&ci->i_ceph_lock);
1741out_unlocked:
1742 if (session && unlock_session)
1743 mutex_unlock(&session->s_mutex);
1744 return flushing;
1745}
1746
1747/*
1748 * Return true if we've flushed caps through the given flush_tid.
1749 */
1750static int caps_are_flushed(struct inode *inode, unsigned tid)
1751{
1752 struct ceph_inode_info *ci = ceph_inode(inode);
1753 int i, ret = 1;
1754
1755 spin_lock(&ci->i_ceph_lock);
1756 for (i = 0; i < CEPH_CAP_BITS; i++)
1757 if ((ci->i_flushing_caps & (1 << i)) &&
1758 ci->i_cap_flush_tid[i] <= tid) {
1759 /* still flushing this bit */
1760 ret = 0;
1761 break;
1762 }
1763 spin_unlock(&ci->i_ceph_lock);
1764 return ret;
1765}
1766
1767/*
1768 * Wait on any unsafe replies for the given inode. First wait on the
1769 * newest request, and make that the upper bound. Then, if there are
1770 * more requests, keep waiting on the oldest as long as it is still older
1771 * than the original request.
1772 */
1773static void sync_write_wait(struct inode *inode)
1774{
1775 struct ceph_inode_info *ci = ceph_inode(inode);
1776 struct list_head *head = &ci->i_unsafe_writes;
1777 struct ceph_osd_request *req;
1778 u64 last_tid;
1779
1780 spin_lock(&ci->i_unsafe_lock);
1781 if (list_empty(head))
1782 goto out;
1783
1784 /* set upper bound as _last_ entry in chain */
1785 req = list_entry(head->prev, struct ceph_osd_request,
1786 r_unsafe_item);
1787 last_tid = req->r_tid;
1788
1789 do {
1790 ceph_osdc_get_request(req);
1791 spin_unlock(&ci->i_unsafe_lock);
1792 dout("sync_write_wait on tid %llu (until %llu)\n",
1793 req->r_tid, last_tid);
1794 wait_for_completion(&req->r_safe_completion);
1795 spin_lock(&ci->i_unsafe_lock);
1796 ceph_osdc_put_request(req);
1797
1798 /*
1799 * from here on look at first entry in chain, since we
1800 * only want to wait for anything older than last_tid
1801 */
1802 if (list_empty(head))
1803 break;
1804 req = list_entry(head->next, struct ceph_osd_request,
1805 r_unsafe_item);
1806 } while (req->r_tid < last_tid);
1807out:
1808 spin_unlock(&ci->i_unsafe_lock);
1809}
1810
1811int ceph_fsync(struct file *file, loff_t start, loff_t end, int datasync)
1812{
1813 struct inode *inode = file->f_mapping->host;
1814 struct ceph_inode_info *ci = ceph_inode(inode);
1815 unsigned flush_tid;
1816 int ret;
1817 int dirty;
1818
1819 dout("fsync %p%s\n", inode, datasync ? " datasync" : "");
1820 sync_write_wait(inode);
1821
1822 ret = filemap_write_and_wait_range(inode->i_mapping, start, end);
1823 if (ret < 0)
1824 return ret;
1825 mutex_lock(&inode->i_mutex);
1826
1827 dirty = try_flush_caps(inode, NULL, &flush_tid);
1828 dout("fsync dirty caps are %s\n", ceph_cap_string(dirty));
1829
1830 /*
1831 * only wait on non-file metadata writeback (the mds
1832 * can recover size and mtime, so we don't need to
1833 * wait for that)
1834 */
1835 if (!datasync && (dirty & ~CEPH_CAP_ANY_FILE_WR)) {
1836 dout("fsync waiting for flush_tid %u\n", flush_tid);
1837 ret = wait_event_interruptible(ci->i_cap_wq,
1838 caps_are_flushed(inode, flush_tid));
1839 }
1840
1841 dout("fsync %p%s done\n", inode, datasync ? " datasync" : "");
1842 mutex_unlock(&inode->i_mutex);
1843 return ret;
1844}
1845
1846/*
1847 * Flush any dirty caps back to the mds. If we aren't asked to wait,
1848 * queue inode for flush but don't do so immediately, because we can
1849 * get by with fewer MDS messages if we wait for data writeback to
1850 * complete first.
1851 */
1852int ceph_write_inode(struct inode *inode, struct writeback_control *wbc)
1853{
1854 struct ceph_inode_info *ci = ceph_inode(inode);
1855 unsigned flush_tid;
1856 int err = 0;
1857 int dirty;
1858 int wait = wbc->sync_mode == WB_SYNC_ALL;
1859
1860 dout("write_inode %p wait=%d\n", inode, wait);
1861 if (wait) {
1862 dirty = try_flush_caps(inode, NULL, &flush_tid);
1863 if (dirty)
1864 err = wait_event_interruptible(ci->i_cap_wq,
1865 caps_are_flushed(inode, flush_tid));
1866 } else {
1867 struct ceph_mds_client *mdsc =
1868 ceph_sb_to_client(inode->i_sb)->mdsc;
1869
1870 spin_lock(&ci->i_ceph_lock);
1871 if (__ceph_caps_dirty(ci))
1872 __cap_delay_requeue_front(mdsc, ci);
1873 spin_unlock(&ci->i_ceph_lock);
1874 }
1875 return err;
1876}
1877
1878/*
1879 * After a recovering MDS goes active, we need to resend any caps
1880 * we were flushing.
1881 *
1882 * Caller holds session->s_mutex.
1883 */
1884static void kick_flushing_capsnaps(struct ceph_mds_client *mdsc,
1885 struct ceph_mds_session *session)
1886{
1887 struct ceph_cap_snap *capsnap;
1888
1889 dout("kick_flushing_capsnaps mds%d\n", session->s_mds);
1890 list_for_each_entry(capsnap, &session->s_cap_snaps_flushing,
1891 flushing_item) {
1892 struct ceph_inode_info *ci = capsnap->ci;
1893 struct inode *inode = &ci->vfs_inode;
1894 struct ceph_cap *cap;
1895
1896 spin_lock(&ci->i_ceph_lock);
1897 cap = ci->i_auth_cap;
1898 if (cap && cap->session == session) {
1899 dout("kick_flushing_caps %p cap %p capsnap %p\n", inode,
1900 cap, capsnap);
1901 __ceph_flush_snaps(ci, &session, 1);
1902 } else {
1903 pr_err("%p auth cap %p not mds%d ???\n", inode,
1904 cap, session->s_mds);
1905 }
1906 spin_unlock(&ci->i_ceph_lock);
1907 }
1908}
1909
1910void ceph_kick_flushing_caps(struct ceph_mds_client *mdsc,
1911 struct ceph_mds_session *session)
1912{
1913 struct ceph_inode_info *ci;
1914
1915 kick_flushing_capsnaps(mdsc, session);
1916
1917 dout("kick_flushing_caps mds%d\n", session->s_mds);
1918 list_for_each_entry(ci, &session->s_cap_flushing, i_flushing_item) {
1919 struct inode *inode = &ci->vfs_inode;
1920 struct ceph_cap *cap;
1921 int delayed = 0;
1922
1923 spin_lock(&ci->i_ceph_lock);
1924 cap = ci->i_auth_cap;
1925 if (cap && cap->session == session) {
1926 dout("kick_flushing_caps %p cap %p %s\n", inode,
1927 cap, ceph_cap_string(ci->i_flushing_caps));
1928 delayed = __send_cap(mdsc, cap, CEPH_CAP_OP_FLUSH,
1929 __ceph_caps_used(ci),
1930 __ceph_caps_wanted(ci),
1931 cap->issued | cap->implemented,
1932 ci->i_flushing_caps, NULL);
1933 if (delayed) {
1934 spin_lock(&ci->i_ceph_lock);
1935 __cap_delay_requeue(mdsc, ci);
1936 spin_unlock(&ci->i_ceph_lock);
1937 }
1938 } else {
1939 pr_err("%p auth cap %p not mds%d ???\n", inode,
1940 cap, session->s_mds);
1941 spin_unlock(&ci->i_ceph_lock);
1942 }
1943 }
1944}
1945
1946static void kick_flushing_inode_caps(struct ceph_mds_client *mdsc,
1947 struct ceph_mds_session *session,
1948 struct inode *inode)
1949{
1950 struct ceph_inode_info *ci = ceph_inode(inode);
1951 struct ceph_cap *cap;
1952 int delayed = 0;
1953
1954 spin_lock(&ci->i_ceph_lock);
1955 cap = ci->i_auth_cap;
1956 dout("kick_flushing_inode_caps %p flushing %s flush_seq %lld\n", inode,
1957 ceph_cap_string(ci->i_flushing_caps), ci->i_cap_flush_seq);
1958 __ceph_flush_snaps(ci, &session, 1);
1959 if (ci->i_flushing_caps) {
1960 delayed = __send_cap(mdsc, cap, CEPH_CAP_OP_FLUSH,
1961 __ceph_caps_used(ci),
1962 __ceph_caps_wanted(ci),
1963 cap->issued | cap->implemented,
1964 ci->i_flushing_caps, NULL);
1965 if (delayed) {
1966 spin_lock(&ci->i_ceph_lock);
1967 __cap_delay_requeue(mdsc, ci);
1968 spin_unlock(&ci->i_ceph_lock);
1969 }
1970 } else {
1971 spin_unlock(&ci->i_ceph_lock);
1972 }
1973}
1974
1975
1976/*
1977 * Take references to capabilities we hold, so that we don't release
1978 * them to the MDS prematurely.
1979 *
1980 * Protected by i_ceph_lock.
1981 */
1982static void __take_cap_refs(struct ceph_inode_info *ci, int got)
1983{
1984 if (got & CEPH_CAP_PIN)
1985 ci->i_pin_ref++;
1986 if (got & CEPH_CAP_FILE_RD)
1987 ci->i_rd_ref++;
1988 if (got & CEPH_CAP_FILE_CACHE)
1989 ci->i_rdcache_ref++;
1990 if (got & CEPH_CAP_FILE_WR)
1991 ci->i_wr_ref++;
1992 if (got & CEPH_CAP_FILE_BUFFER) {
1993 if (ci->i_wb_ref == 0)
1994 ihold(&ci->vfs_inode);
1995 ci->i_wb_ref++;
1996 dout("__take_cap_refs %p wb %d -> %d (?)\n",
1997 &ci->vfs_inode, ci->i_wb_ref-1, ci->i_wb_ref);
1998 }
1999}
2000
2001/*
2002 * Try to grab cap references. Specify those refs we @want, and the
2003 * minimal set we @need. Also include the larger offset we are writing
2004 * to (when applicable), and check against max_size here as well.
2005 * Note that caller is responsible for ensuring max_size increases are
2006 * requested from the MDS.
2007 */
2008static int try_get_cap_refs(struct ceph_inode_info *ci, int need, int want,
2009 int *got, loff_t endoff, int *check_max, int *err)
2010{
2011 struct inode *inode = &ci->vfs_inode;
2012 int ret = 0;
2013 int have, implemented;
2014 int file_wanted;
2015
2016 dout("get_cap_refs %p need %s want %s\n", inode,
2017 ceph_cap_string(need), ceph_cap_string(want));
2018 spin_lock(&ci->i_ceph_lock);
2019
2020 /* make sure file is actually open */
2021 file_wanted = __ceph_caps_file_wanted(ci);
2022 if ((file_wanted & need) == 0) {
2023 dout("try_get_cap_refs need %s file_wanted %s, EBADF\n",
2024 ceph_cap_string(need), ceph_cap_string(file_wanted));
2025 *err = -EBADF;
2026 ret = 1;
2027 goto out;
2028 }
2029
2030 if (need & CEPH_CAP_FILE_WR) {
2031 if (endoff >= 0 && endoff > (loff_t)ci->i_max_size) {
2032 dout("get_cap_refs %p endoff %llu > maxsize %llu\n",
2033 inode, endoff, ci->i_max_size);
2034 if (endoff > ci->i_wanted_max_size) {
2035 *check_max = 1;
2036 ret = 1;
2037 }
2038 goto out;
2039 }
2040 /*
2041 * If a sync write is in progress, we must wait, so that we
2042 * can get a final snapshot value for size+mtime.
2043 */
2044 if (__ceph_have_pending_cap_snap(ci)) {
2045 dout("get_cap_refs %p cap_snap_pending\n", inode);
2046 goto out;
2047 }
2048 }
2049 have = __ceph_caps_issued(ci, &implemented);
2050
2051 /*
2052 * disallow writes while a truncate is pending
2053 */
2054 if (ci->i_truncate_pending)
2055 have &= ~CEPH_CAP_FILE_WR;
2056
2057 if ((have & need) == need) {
2058 /*
2059 * Look at (implemented & ~have & not) so that we keep waiting
2060 * on transition from wanted -> needed caps. This is needed
2061 * for WRBUFFER|WR -> WR to avoid a new WR sync write from
2062 * going before a prior buffered writeback happens.
2063 */
2064 int not = want & ~(have & need);
2065 int revoking = implemented & ~have;
2066 dout("get_cap_refs %p have %s but not %s (revoking %s)\n",
2067 inode, ceph_cap_string(have), ceph_cap_string(not),
2068 ceph_cap_string(revoking));
2069 if ((revoking & not) == 0) {
2070 *got = need | (have & want);
2071 __take_cap_refs(ci, *got);
2072 ret = 1;
2073 }
2074 } else {
2075 dout("get_cap_refs %p have %s needed %s\n", inode,
2076 ceph_cap_string(have), ceph_cap_string(need));
2077 }
2078out:
2079 spin_unlock(&ci->i_ceph_lock);
2080 dout("get_cap_refs %p ret %d got %s\n", inode,
2081 ret, ceph_cap_string(*got));
2082 return ret;
2083}
2084
2085/*
2086 * Check the offset we are writing up to against our current
2087 * max_size. If necessary, tell the MDS we want to write to
2088 * a larger offset.
2089 */
2090static void check_max_size(struct inode *inode, loff_t endoff)
2091{
2092 struct ceph_inode_info *ci = ceph_inode(inode);
2093 int check = 0;
2094
2095 /* do we need to explicitly request a larger max_size? */
2096 spin_lock(&ci->i_ceph_lock);
2097 if ((endoff >= ci->i_max_size ||
2098 endoff > (inode->i_size << 1)) &&
2099 endoff > ci->i_wanted_max_size) {
2100 dout("write %p at large endoff %llu, req max_size\n",
2101 inode, endoff);
2102 ci->i_wanted_max_size = endoff;
2103 check = 1;
2104 }
2105 spin_unlock(&ci->i_ceph_lock);
2106 if (check)
2107 ceph_check_caps(ci, CHECK_CAPS_AUTHONLY, NULL);
2108}
2109
2110/*
2111 * Wait for caps, and take cap references. If we can't get a WR cap
2112 * due to a small max_size, make sure we check_max_size (and possibly
2113 * ask the mds) so we don't get hung up indefinitely.
2114 */
2115int ceph_get_caps(struct ceph_inode_info *ci, int need, int want, int *got,
2116 loff_t endoff)
2117{
2118 int check_max, ret, err;
2119
2120retry:
2121 if (endoff > 0)
2122 check_max_size(&ci->vfs_inode, endoff);
2123 check_max = 0;
2124 err = 0;
2125 ret = wait_event_interruptible(ci->i_cap_wq,
2126 try_get_cap_refs(ci, need, want,
2127 got, endoff,
2128 &check_max, &err));
2129 if (err)
2130 ret = err;
2131 if (check_max)
2132 goto retry;
2133 return ret;
2134}
2135
2136/*
2137 * Take cap refs. Caller must already know we hold at least one ref
2138 * on the caps in question or we don't know this is safe.
2139 */
2140void ceph_get_cap_refs(struct ceph_inode_info *ci, int caps)
2141{
2142 spin_lock(&ci->i_ceph_lock);
2143 __take_cap_refs(ci, caps);
2144 spin_unlock(&ci->i_ceph_lock);
2145}
2146
2147/*
2148 * Release cap refs.
2149 *
2150 * If we released the last ref on any given cap, call ceph_check_caps
2151 * to release (or schedule a release).
2152 *
2153 * If we are releasing a WR cap (from a sync write), finalize any affected
2154 * cap_snap, and wake up any waiters.
2155 */
2156void ceph_put_cap_refs(struct ceph_inode_info *ci, int had)
2157{
2158 struct inode *inode = &ci->vfs_inode;
2159 int last = 0, put = 0, flushsnaps = 0, wake = 0;
2160 struct ceph_cap_snap *capsnap;
2161
2162 spin_lock(&ci->i_ceph_lock);
2163 if (had & CEPH_CAP_PIN)
2164 --ci->i_pin_ref;
2165 if (had & CEPH_CAP_FILE_RD)
2166 if (--ci->i_rd_ref == 0)
2167 last++;
2168 if (had & CEPH_CAP_FILE_CACHE)
2169 if (--ci->i_rdcache_ref == 0)
2170 last++;
2171 if (had & CEPH_CAP_FILE_BUFFER) {
2172 if (--ci->i_wb_ref == 0) {
2173 last++;
2174 put++;
2175 }
2176 dout("put_cap_refs %p wb %d -> %d (?)\n",
2177 inode, ci->i_wb_ref+1, ci->i_wb_ref);
2178 }
2179 if (had & CEPH_CAP_FILE_WR)
2180 if (--ci->i_wr_ref == 0) {
2181 last++;
2182 if (!list_empty(&ci->i_cap_snaps)) {
2183 capsnap = list_first_entry(&ci->i_cap_snaps,
2184 struct ceph_cap_snap,
2185 ci_item);
2186 if (capsnap->writing) {
2187 capsnap->writing = 0;
2188 flushsnaps =
2189 __ceph_finish_cap_snap(ci,
2190 capsnap);
2191 wake = 1;
2192 }
2193 }
2194 }
2195 spin_unlock(&ci->i_ceph_lock);
2196
2197 dout("put_cap_refs %p had %s%s%s\n", inode, ceph_cap_string(had),
2198 last ? " last" : "", put ? " put" : "");
2199
2200 if (last && !flushsnaps)
2201 ceph_check_caps(ci, 0, NULL);
2202 else if (flushsnaps)
2203 ceph_flush_snaps(ci);
2204 if (wake)
2205 wake_up_all(&ci->i_cap_wq);
2206 if (put)
2207 iput(inode);
2208}
2209
2210/*
2211 * Release @nr WRBUFFER refs on dirty pages for the given @snapc snap
2212 * context. Adjust per-snap dirty page accounting as appropriate.
2213 * Once all dirty data for a cap_snap is flushed, flush snapped file
2214 * metadata back to the MDS. If we dropped the last ref, call
2215 * ceph_check_caps.
2216 */
2217void ceph_put_wrbuffer_cap_refs(struct ceph_inode_info *ci, int nr,
2218 struct ceph_snap_context *snapc)
2219{
2220 struct inode *inode = &ci->vfs_inode;
2221 int last = 0;
2222 int complete_capsnap = 0;
2223 int drop_capsnap = 0;
2224 int found = 0;
2225 struct ceph_cap_snap *capsnap = NULL;
2226
2227 spin_lock(&ci->i_ceph_lock);
2228 ci->i_wrbuffer_ref -= nr;
2229 last = !ci->i_wrbuffer_ref;
2230
2231 if (ci->i_head_snapc == snapc) {
2232 ci->i_wrbuffer_ref_head -= nr;
2233 if (ci->i_wrbuffer_ref_head == 0 &&
2234 ci->i_dirty_caps == 0 && ci->i_flushing_caps == 0) {
2235 BUG_ON(!ci->i_head_snapc);
2236 ceph_put_snap_context(ci->i_head_snapc);
2237 ci->i_head_snapc = NULL;
2238 }
2239 dout("put_wrbuffer_cap_refs on %p head %d/%d -> %d/%d %s\n",
2240 inode,
2241 ci->i_wrbuffer_ref+nr, ci->i_wrbuffer_ref_head+nr,
2242 ci->i_wrbuffer_ref, ci->i_wrbuffer_ref_head,
2243 last ? " LAST" : "");
2244 } else {
2245 list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) {
2246 if (capsnap->context == snapc) {
2247 found = 1;
2248 break;
2249 }
2250 }
2251 BUG_ON(!found);
2252 capsnap->dirty_pages -= nr;
2253 if (capsnap->dirty_pages == 0) {
2254 complete_capsnap = 1;
2255 if (capsnap->dirty == 0)
2256 /* cap writeback completed before we created
2257 * the cap_snap; no FLUSHSNAP is needed */
2258 drop_capsnap = 1;
2259 }
2260 dout("put_wrbuffer_cap_refs on %p cap_snap %p "
2261 " snap %lld %d/%d -> %d/%d %s%s%s\n",
2262 inode, capsnap, capsnap->context->seq,
2263 ci->i_wrbuffer_ref+nr, capsnap->dirty_pages + nr,
2264 ci->i_wrbuffer_ref, capsnap->dirty_pages,
2265 last ? " (wrbuffer last)" : "",
2266 complete_capsnap ? " (complete capsnap)" : "",
2267 drop_capsnap ? " (drop capsnap)" : "");
2268 if (drop_capsnap) {
2269 ceph_put_snap_context(capsnap->context);
2270 list_del(&capsnap->ci_item);
2271 list_del(&capsnap->flushing_item);
2272 ceph_put_cap_snap(capsnap);
2273 }
2274 }
2275
2276 spin_unlock(&ci->i_ceph_lock);
2277
2278 if (last) {
2279 ceph_check_caps(ci, CHECK_CAPS_AUTHONLY, NULL);
2280 iput(inode);
2281 } else if (complete_capsnap) {
2282 ceph_flush_snaps(ci);
2283 wake_up_all(&ci->i_cap_wq);
2284 }
2285 if (drop_capsnap)
2286 iput(inode);
2287}
2288
2289/*
2290 * Handle a cap GRANT message from the MDS. (Note that a GRANT may
2291 * actually be a revocation if it specifies a smaller cap set.)
2292 *
2293 * caller holds s_mutex and i_ceph_lock, we drop both.
2294 *
2295 * return value:
2296 * 0 - ok
2297 * 1 - check_caps on auth cap only (writeback)
2298 * 2 - check_caps (ack revoke)
2299 */
2300static void handle_cap_grant(struct inode *inode, struct ceph_mds_caps *grant,
2301 struct ceph_mds_session *session,
2302 struct ceph_cap *cap,
2303 struct ceph_buffer *xattr_buf)
2304 __releases(ci->i_ceph_lock)
2305{
2306 struct ceph_inode_info *ci = ceph_inode(inode);
2307 int mds = session->s_mds;
2308 int seq = le32_to_cpu(grant->seq);
2309 int newcaps = le32_to_cpu(grant->caps);
2310 int issued, implemented, used, wanted, dirty;
2311 u64 size = le64_to_cpu(grant->size);
2312 u64 max_size = le64_to_cpu(grant->max_size);
2313 struct timespec mtime, atime, ctime;
2314 int check_caps = 0;
2315 int wake = 0;
2316 int writeback = 0;
2317 int revoked_rdcache = 0;
2318 int queue_invalidate = 0;
2319
2320 dout("handle_cap_grant inode %p cap %p mds%d seq %d %s\n",
2321 inode, cap, mds, seq, ceph_cap_string(newcaps));
2322 dout(" size %llu max_size %llu, i_size %llu\n", size, max_size,
2323 inode->i_size);
2324
2325 /*
2326 * If CACHE is being revoked, and we have no dirty buffers,
2327 * try to invalidate (once). (If there are dirty buffers, we
2328 * will invalidate _after_ writeback.)
2329 */
2330 if (((cap->issued & ~newcaps) & CEPH_CAP_FILE_CACHE) &&
2331 (newcaps & CEPH_CAP_FILE_LAZYIO) == 0 &&
2332 !ci->i_wrbuffer_ref) {
2333 if (try_nonblocking_invalidate(inode) == 0) {
2334 revoked_rdcache = 1;
2335 } else {
2336 /* there were locked pages.. invalidate later
2337 in a separate thread. */
2338 if (ci->i_rdcache_revoking != ci->i_rdcache_gen) {
2339 queue_invalidate = 1;
2340 ci->i_rdcache_revoking = ci->i_rdcache_gen;
2341 }
2342 }
2343 }
2344
2345 /* side effects now are allowed */
2346
2347 issued = __ceph_caps_issued(ci, &implemented);
2348 issued |= implemented | __ceph_caps_dirty(ci);
2349
2350 cap->cap_gen = session->s_cap_gen;
2351
2352 __check_cap_issue(ci, cap, newcaps);
2353
2354 if ((issued & CEPH_CAP_AUTH_EXCL) == 0) {
2355 inode->i_mode = le32_to_cpu(grant->mode);
2356 inode->i_uid = le32_to_cpu(grant->uid);
2357 inode->i_gid = le32_to_cpu(grant->gid);
2358 dout("%p mode 0%o uid.gid %d.%d\n", inode, inode->i_mode,
2359 inode->i_uid, inode->i_gid);
2360 }
2361
2362 if ((issued & CEPH_CAP_LINK_EXCL) == 0)
2363 set_nlink(inode, le32_to_cpu(grant->nlink));
2364
2365 if ((issued & CEPH_CAP_XATTR_EXCL) == 0 && grant->xattr_len) {
2366 int len = le32_to_cpu(grant->xattr_len);
2367 u64 version = le64_to_cpu(grant->xattr_version);
2368
2369 if (version > ci->i_xattrs.version) {
2370 dout(" got new xattrs v%llu on %p len %d\n",
2371 version, inode, len);
2372 if (ci->i_xattrs.blob)
2373 ceph_buffer_put(ci->i_xattrs.blob);
2374 ci->i_xattrs.blob = ceph_buffer_get(xattr_buf);
2375 ci->i_xattrs.version = version;
2376 }
2377 }
2378
2379 /* size/ctime/mtime/atime? */
2380 ceph_fill_file_size(inode, issued,
2381 le32_to_cpu(grant->truncate_seq),
2382 le64_to_cpu(grant->truncate_size), size);
2383 ceph_decode_timespec(&mtime, &grant->mtime);
2384 ceph_decode_timespec(&atime, &grant->atime);
2385 ceph_decode_timespec(&ctime, &grant->ctime);
2386 ceph_fill_file_time(inode, issued,
2387 le32_to_cpu(grant->time_warp_seq), &ctime, &mtime,
2388 &atime);
2389
2390 /* max size increase? */
2391 if (max_size != ci->i_max_size) {
2392 dout("max_size %lld -> %llu\n", ci->i_max_size, max_size);
2393 ci->i_max_size = max_size;
2394 if (max_size >= ci->i_wanted_max_size) {
2395 ci->i_wanted_max_size = 0; /* reset */
2396 ci->i_requested_max_size = 0;
2397 }
2398 wake = 1;
2399 }
2400
2401 /* check cap bits */
2402 wanted = __ceph_caps_wanted(ci);
2403 used = __ceph_caps_used(ci);
2404 dirty = __ceph_caps_dirty(ci);
2405 dout(" my wanted = %s, used = %s, dirty %s\n",
2406 ceph_cap_string(wanted),
2407 ceph_cap_string(used),
2408 ceph_cap_string(dirty));
2409 if (wanted != le32_to_cpu(grant->wanted)) {
2410 dout("mds wanted %s -> %s\n",
2411 ceph_cap_string(le32_to_cpu(grant->wanted)),
2412 ceph_cap_string(wanted));
2413 grant->wanted = cpu_to_le32(wanted);
2414 }
2415
2416 cap->seq = seq;
2417
2418 /* file layout may have changed */
2419 ci->i_layout = grant->layout;
2420
2421 /* revocation, grant, or no-op? */
2422 if (cap->issued & ~newcaps) {
2423 int revoking = cap->issued & ~newcaps;
2424
2425 dout("revocation: %s -> %s (revoking %s)\n",
2426 ceph_cap_string(cap->issued),
2427 ceph_cap_string(newcaps),
2428 ceph_cap_string(revoking));
2429 if (revoking & used & CEPH_CAP_FILE_BUFFER)
2430 writeback = 1; /* initiate writeback; will delay ack */
2431 else if (revoking == CEPH_CAP_FILE_CACHE &&
2432 (newcaps & CEPH_CAP_FILE_LAZYIO) == 0 &&
2433 queue_invalidate)
2434 ; /* do nothing yet, invalidation will be queued */
2435 else if (cap == ci->i_auth_cap)
2436 check_caps = 1; /* check auth cap only */
2437 else
2438 check_caps = 2; /* check all caps */
2439 cap->issued = newcaps;
2440 cap->implemented |= newcaps;
2441 } else if (cap->issued == newcaps) {
2442 dout("caps unchanged: %s -> %s\n",
2443 ceph_cap_string(cap->issued), ceph_cap_string(newcaps));
2444 } else {
2445 dout("grant: %s -> %s\n", ceph_cap_string(cap->issued),
2446 ceph_cap_string(newcaps));
2447 cap->issued = newcaps;
2448 cap->implemented |= newcaps; /* add bits only, to
2449 * avoid stepping on a
2450 * pending revocation */
2451 wake = 1;
2452 }
2453 BUG_ON(cap->issued & ~cap->implemented);
2454
2455 spin_unlock(&ci->i_ceph_lock);
2456 if (writeback)
2457 /*
2458 * queue inode for writeback: we can't actually call
2459 * filemap_write_and_wait, etc. from message handler
2460 * context.
2461 */
2462 ceph_queue_writeback(inode);
2463 if (queue_invalidate)
2464 ceph_queue_invalidate(inode);
2465 if (wake)
2466 wake_up_all(&ci->i_cap_wq);
2467
2468 if (check_caps == 1)
2469 ceph_check_caps(ci, CHECK_CAPS_NODELAY|CHECK_CAPS_AUTHONLY,
2470 session);
2471 else if (check_caps == 2)
2472 ceph_check_caps(ci, CHECK_CAPS_NODELAY, session);
2473 else
2474 mutex_unlock(&session->s_mutex);
2475}
2476
2477/*
2478 * Handle FLUSH_ACK from MDS, indicating that metadata we sent to the
2479 * MDS has been safely committed.
2480 */
2481static void handle_cap_flush_ack(struct inode *inode, u64 flush_tid,
2482 struct ceph_mds_caps *m,
2483 struct ceph_mds_session *session,
2484 struct ceph_cap *cap)
2485 __releases(ci->i_ceph_lock)
2486{
2487 struct ceph_inode_info *ci = ceph_inode(inode);
2488 struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
2489 unsigned seq = le32_to_cpu(m->seq);
2490 int dirty = le32_to_cpu(m->dirty);
2491 int cleaned = 0;
2492 int drop = 0;
2493 int i;
2494
2495 for (i = 0; i < CEPH_CAP_BITS; i++)
2496 if ((dirty & (1 << i)) &&
2497 flush_tid == ci->i_cap_flush_tid[i])
2498 cleaned |= 1 << i;
2499
2500 dout("handle_cap_flush_ack inode %p mds%d seq %d on %s cleaned %s,"
2501 " flushing %s -> %s\n",
2502 inode, session->s_mds, seq, ceph_cap_string(dirty),
2503 ceph_cap_string(cleaned), ceph_cap_string(ci->i_flushing_caps),
2504 ceph_cap_string(ci->i_flushing_caps & ~cleaned));
2505
2506 if (ci->i_flushing_caps == (ci->i_flushing_caps & ~cleaned))
2507 goto out;
2508
2509 ci->i_flushing_caps &= ~cleaned;
2510
2511 spin_lock(&mdsc->cap_dirty_lock);
2512 if (ci->i_flushing_caps == 0) {
2513 list_del_init(&ci->i_flushing_item);
2514 if (!list_empty(&session->s_cap_flushing))
2515 dout(" mds%d still flushing cap on %p\n",
2516 session->s_mds,
2517 &list_entry(session->s_cap_flushing.next,
2518 struct ceph_inode_info,
2519 i_flushing_item)->vfs_inode);
2520 mdsc->num_cap_flushing--;
2521 wake_up_all(&mdsc->cap_flushing_wq);
2522 dout(" inode %p now !flushing\n", inode);
2523
2524 if (ci->i_dirty_caps == 0) {
2525 dout(" inode %p now clean\n", inode);
2526 BUG_ON(!list_empty(&ci->i_dirty_item));
2527 drop = 1;
2528 if (ci->i_wrbuffer_ref_head == 0) {
2529 BUG_ON(!ci->i_head_snapc);
2530 ceph_put_snap_context(ci->i_head_snapc);
2531 ci->i_head_snapc = NULL;
2532 }
2533 } else {
2534 BUG_ON(list_empty(&ci->i_dirty_item));
2535 }
2536 }
2537 spin_unlock(&mdsc->cap_dirty_lock);
2538 wake_up_all(&ci->i_cap_wq);
2539
2540out:
2541 spin_unlock(&ci->i_ceph_lock);
2542 if (drop)
2543 iput(inode);
2544}
2545
2546/*
2547 * Handle FLUSHSNAP_ACK. MDS has flushed snap data to disk and we can
2548 * throw away our cap_snap.
2549 *
2550 * Caller hold s_mutex.
2551 */
2552static void handle_cap_flushsnap_ack(struct inode *inode, u64 flush_tid,
2553 struct ceph_mds_caps *m,
2554 struct ceph_mds_session *session)
2555{
2556 struct ceph_inode_info *ci = ceph_inode(inode);
2557 u64 follows = le64_to_cpu(m->snap_follows);
2558 struct ceph_cap_snap *capsnap;
2559 int drop = 0;
2560
2561 dout("handle_cap_flushsnap_ack inode %p ci %p mds%d follows %lld\n",
2562 inode, ci, session->s_mds, follows);
2563
2564 spin_lock(&ci->i_ceph_lock);
2565 list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) {
2566 if (capsnap->follows == follows) {
2567 if (capsnap->flush_tid != flush_tid) {
2568 dout(" cap_snap %p follows %lld tid %lld !="
2569 " %lld\n", capsnap, follows,
2570 flush_tid, capsnap->flush_tid);
2571 break;
2572 }
2573 WARN_ON(capsnap->dirty_pages || capsnap->writing);
2574 dout(" removing %p cap_snap %p follows %lld\n",
2575 inode, capsnap, follows);
2576 ceph_put_snap_context(capsnap->context);
2577 list_del(&capsnap->ci_item);
2578 list_del(&capsnap->flushing_item);
2579 ceph_put_cap_snap(capsnap);
2580 drop = 1;
2581 break;
2582 } else {
2583 dout(" skipping cap_snap %p follows %lld\n",
2584 capsnap, capsnap->follows);
2585 }
2586 }
2587 spin_unlock(&ci->i_ceph_lock);
2588 if (drop)
2589 iput(inode);
2590}
2591
2592/*
2593 * Handle TRUNC from MDS, indicating file truncation.
2594 *
2595 * caller hold s_mutex.
2596 */
2597static void handle_cap_trunc(struct inode *inode,
2598 struct ceph_mds_caps *trunc,
2599 struct ceph_mds_session *session)
2600 __releases(ci->i_ceph_lock)
2601{
2602 struct ceph_inode_info *ci = ceph_inode(inode);
2603 int mds = session->s_mds;
2604 int seq = le32_to_cpu(trunc->seq);
2605 u32 truncate_seq = le32_to_cpu(trunc->truncate_seq);
2606 u64 truncate_size = le64_to_cpu(trunc->truncate_size);
2607 u64 size = le64_to_cpu(trunc->size);
2608 int implemented = 0;
2609 int dirty = __ceph_caps_dirty(ci);
2610 int issued = __ceph_caps_issued(ceph_inode(inode), &implemented);
2611 int queue_trunc = 0;
2612
2613 issued |= implemented | dirty;
2614
2615 dout("handle_cap_trunc inode %p mds%d seq %d to %lld seq %d\n",
2616 inode, mds, seq, truncate_size, truncate_seq);
2617 queue_trunc = ceph_fill_file_size(inode, issued,
2618 truncate_seq, truncate_size, size);
2619 spin_unlock(&ci->i_ceph_lock);
2620
2621 if (queue_trunc)
2622 ceph_queue_vmtruncate(inode);
2623}
2624
2625/*
2626 * Handle EXPORT from MDS. Cap is being migrated _from_ this mds to a
2627 * different one. If we are the most recent migration we've seen (as
2628 * indicated by mseq), make note of the migrating cap bits for the
2629 * duration (until we see the corresponding IMPORT).
2630 *
2631 * caller holds s_mutex
2632 */
2633static void handle_cap_export(struct inode *inode, struct ceph_mds_caps *ex,
2634 struct ceph_mds_session *session,
2635 int *open_target_sessions)
2636{
2637 struct ceph_mds_client *mdsc = ceph_inode_to_client(inode)->mdsc;
2638 struct ceph_inode_info *ci = ceph_inode(inode);
2639 int mds = session->s_mds;
2640 unsigned mseq = le32_to_cpu(ex->migrate_seq);
2641 struct ceph_cap *cap = NULL, *t;
2642 struct rb_node *p;
2643 int remember = 1;
2644
2645 dout("handle_cap_export inode %p ci %p mds%d mseq %d\n",
2646 inode, ci, mds, mseq);
2647
2648 spin_lock(&ci->i_ceph_lock);
2649
2650 /* make sure we haven't seen a higher mseq */
2651 for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
2652 t = rb_entry(p, struct ceph_cap, ci_node);
2653 if (ceph_seq_cmp(t->mseq, mseq) > 0) {
2654 dout(" higher mseq on cap from mds%d\n",
2655 t->session->s_mds);
2656 remember = 0;
2657 }
2658 if (t->session->s_mds == mds)
2659 cap = t;
2660 }
2661
2662 if (cap) {
2663 if (remember) {
2664 /* make note */
2665 ci->i_cap_exporting_mds = mds;
2666 ci->i_cap_exporting_mseq = mseq;
2667 ci->i_cap_exporting_issued = cap->issued;
2668
2669 /*
2670 * make sure we have open sessions with all possible
2671 * export targets, so that we get the matching IMPORT
2672 */
2673 *open_target_sessions = 1;
2674
2675 /*
2676 * we can't flush dirty caps that we've seen the
2677 * EXPORT but no IMPORT for
2678 */
2679 spin_lock(&mdsc->cap_dirty_lock);
2680 if (!list_empty(&ci->i_dirty_item)) {
2681 dout(" moving %p to cap_dirty_migrating\n",
2682 inode);
2683 list_move(&ci->i_dirty_item,
2684 &mdsc->cap_dirty_migrating);
2685 }
2686 spin_unlock(&mdsc->cap_dirty_lock);
2687 }
2688 __ceph_remove_cap(cap);
2689 }
2690 /* else, we already released it */
2691
2692 spin_unlock(&ci->i_ceph_lock);
2693}
2694
2695/*
2696 * Handle cap IMPORT. If there are temp bits from an older EXPORT,
2697 * clean them up.
2698 *
2699 * caller holds s_mutex.
2700 */
2701static void handle_cap_import(struct ceph_mds_client *mdsc,
2702 struct inode *inode, struct ceph_mds_caps *im,
2703 struct ceph_mds_session *session,
2704 void *snaptrace, int snaptrace_len)
2705{
2706 struct ceph_inode_info *ci = ceph_inode(inode);
2707 int mds = session->s_mds;
2708 unsigned issued = le32_to_cpu(im->caps);
2709 unsigned wanted = le32_to_cpu(im->wanted);
2710 unsigned seq = le32_to_cpu(im->seq);
2711 unsigned mseq = le32_to_cpu(im->migrate_seq);
2712 u64 realmino = le64_to_cpu(im->realm);
2713 u64 cap_id = le64_to_cpu(im->cap_id);
2714
2715 if (ci->i_cap_exporting_mds >= 0 &&
2716 ceph_seq_cmp(ci->i_cap_exporting_mseq, mseq) < 0) {
2717 dout("handle_cap_import inode %p ci %p mds%d mseq %d"
2718 " - cleared exporting from mds%d\n",
2719 inode, ci, mds, mseq,
2720 ci->i_cap_exporting_mds);
2721 ci->i_cap_exporting_issued = 0;
2722 ci->i_cap_exporting_mseq = 0;
2723 ci->i_cap_exporting_mds = -1;
2724
2725 spin_lock(&mdsc->cap_dirty_lock);
2726 if (!list_empty(&ci->i_dirty_item)) {
2727 dout(" moving %p back to cap_dirty\n", inode);
2728 list_move(&ci->i_dirty_item, &mdsc->cap_dirty);
2729 }
2730 spin_unlock(&mdsc->cap_dirty_lock);
2731 } else {
2732 dout("handle_cap_import inode %p ci %p mds%d mseq %d\n",
2733 inode, ci, mds, mseq);
2734 }
2735
2736 down_write(&mdsc->snap_rwsem);
2737 ceph_update_snap_trace(mdsc, snaptrace, snaptrace+snaptrace_len,
2738 false);
2739 downgrade_write(&mdsc->snap_rwsem);
2740 ceph_add_cap(inode, session, cap_id, -1,
2741 issued, wanted, seq, mseq, realmino, CEPH_CAP_FLAG_AUTH,
2742 NULL /* no caps context */);
2743 kick_flushing_inode_caps(mdsc, session, inode);
2744 up_read(&mdsc->snap_rwsem);
2745
2746 /* make sure we re-request max_size, if necessary */
2747 spin_lock(&ci->i_ceph_lock);
2748 ci->i_requested_max_size = 0;
2749 spin_unlock(&ci->i_ceph_lock);
2750}
2751
2752/*
2753 * Handle a caps message from the MDS.
2754 *
2755 * Identify the appropriate session, inode, and call the right handler
2756 * based on the cap op.
2757 */
2758void ceph_handle_caps(struct ceph_mds_session *session,
2759 struct ceph_msg *msg)
2760{
2761 struct ceph_mds_client *mdsc = session->s_mdsc;
2762 struct super_block *sb = mdsc->fsc->sb;
2763 struct inode *inode;
2764 struct ceph_inode_info *ci;
2765 struct ceph_cap *cap;
2766 struct ceph_mds_caps *h;
2767 int mds = session->s_mds;
2768 int op;
2769 u32 seq, mseq;
2770 struct ceph_vino vino;
2771 u64 cap_id;
2772 u64 size, max_size;
2773 u64 tid;
2774 void *snaptrace;
2775 size_t snaptrace_len;
2776 void *flock;
2777 u32 flock_len;
2778 int open_target_sessions = 0;
2779
2780 dout("handle_caps from mds%d\n", mds);
2781
2782 /* decode */
2783 tid = le64_to_cpu(msg->hdr.tid);
2784 if (msg->front.iov_len < sizeof(*h))
2785 goto bad;
2786 h = msg->front.iov_base;
2787 op = le32_to_cpu(h->op);
2788 vino.ino = le64_to_cpu(h->ino);
2789 vino.snap = CEPH_NOSNAP;
2790 cap_id = le64_to_cpu(h->cap_id);
2791 seq = le32_to_cpu(h->seq);
2792 mseq = le32_to_cpu(h->migrate_seq);
2793 size = le64_to_cpu(h->size);
2794 max_size = le64_to_cpu(h->max_size);
2795
2796 snaptrace = h + 1;
2797 snaptrace_len = le32_to_cpu(h->snap_trace_len);
2798
2799 if (le16_to_cpu(msg->hdr.version) >= 2) {
2800 void *p, *end;
2801
2802 p = snaptrace + snaptrace_len;
2803 end = msg->front.iov_base + msg->front.iov_len;
2804 ceph_decode_32_safe(&p, end, flock_len, bad);
2805 flock = p;
2806 } else {
2807 flock = NULL;
2808 flock_len = 0;
2809 }
2810
2811 mutex_lock(&session->s_mutex);
2812 session->s_seq++;
2813 dout(" mds%d seq %lld cap seq %u\n", session->s_mds, session->s_seq,
2814 (unsigned)seq);
2815
2816 /* lookup ino */
2817 inode = ceph_find_inode(sb, vino);
2818 ci = ceph_inode(inode);
2819 dout(" op %s ino %llx.%llx inode %p\n", ceph_cap_op_name(op), vino.ino,
2820 vino.snap, inode);
2821 if (!inode) {
2822 dout(" i don't have ino %llx\n", vino.ino);
2823
2824 if (op == CEPH_CAP_OP_IMPORT)
2825 __queue_cap_release(session, vino.ino, cap_id,
2826 mseq, seq);
2827 goto flush_cap_releases;
2828 }
2829
2830 /* these will work even if we don't have a cap yet */
2831 switch (op) {
2832 case CEPH_CAP_OP_FLUSHSNAP_ACK:
2833 handle_cap_flushsnap_ack(inode, tid, h, session);
2834 goto done;
2835
2836 case CEPH_CAP_OP_EXPORT:
2837 handle_cap_export(inode, h, session, &open_target_sessions);
2838 goto done;
2839
2840 case CEPH_CAP_OP_IMPORT:
2841 handle_cap_import(mdsc, inode, h, session,
2842 snaptrace, snaptrace_len);
2843 ceph_check_caps(ceph_inode(inode), 0, session);
2844 goto done_unlocked;
2845 }
2846
2847 /* the rest require a cap */
2848 spin_lock(&ci->i_ceph_lock);
2849 cap = __get_cap_for_mds(ceph_inode(inode), mds);
2850 if (!cap) {
2851 dout(" no cap on %p ino %llx.%llx from mds%d\n",
2852 inode, ceph_ino(inode), ceph_snap(inode), mds);
2853 spin_unlock(&ci->i_ceph_lock);
2854 goto flush_cap_releases;
2855 }
2856
2857 /* note that each of these drops i_ceph_lock for us */
2858 switch (op) {
2859 case CEPH_CAP_OP_REVOKE:
2860 case CEPH_CAP_OP_GRANT:
2861 handle_cap_grant(inode, h, session, cap, msg->middle);
2862 goto done_unlocked;
2863
2864 case CEPH_CAP_OP_FLUSH_ACK:
2865 handle_cap_flush_ack(inode, tid, h, session, cap);
2866 break;
2867
2868 case CEPH_CAP_OP_TRUNC:
2869 handle_cap_trunc(inode, h, session);
2870 break;
2871
2872 default:
2873 spin_unlock(&ci->i_ceph_lock);
2874 pr_err("ceph_handle_caps: unknown cap op %d %s\n", op,
2875 ceph_cap_op_name(op));
2876 }
2877
2878 goto done;
2879
2880flush_cap_releases:
2881 /*
2882 * send any full release message to try to move things
2883 * along for the mds (who clearly thinks we still have this
2884 * cap).
2885 */
2886 ceph_add_cap_releases(mdsc, session);
2887 ceph_send_cap_releases(mdsc, session);
2888
2889done:
2890 mutex_unlock(&session->s_mutex);
2891done_unlocked:
2892 if (inode)
2893 iput(inode);
2894 if (open_target_sessions)
2895 ceph_mdsc_open_export_target_sessions(mdsc, session);
2896 return;
2897
2898bad:
2899 pr_err("ceph_handle_caps: corrupt message\n");
2900 ceph_msg_dump(msg);
2901 return;
2902}
2903
2904/*
2905 * Delayed work handler to process end of delayed cap release LRU list.
2906 */
2907void ceph_check_delayed_caps(struct ceph_mds_client *mdsc)
2908{
2909 struct ceph_inode_info *ci;
2910 int flags = CHECK_CAPS_NODELAY;
2911
2912 dout("check_delayed_caps\n");
2913 while (1) {
2914 spin_lock(&mdsc->cap_delay_lock);
2915 if (list_empty(&mdsc->cap_delay_list))
2916 break;
2917 ci = list_first_entry(&mdsc->cap_delay_list,
2918 struct ceph_inode_info,
2919 i_cap_delay_list);
2920 if ((ci->i_ceph_flags & CEPH_I_FLUSH) == 0 &&
2921 time_before(jiffies, ci->i_hold_caps_max))
2922 break;
2923 list_del_init(&ci->i_cap_delay_list);
2924 spin_unlock(&mdsc->cap_delay_lock);
2925 dout("check_delayed_caps on %p\n", &ci->vfs_inode);
2926 ceph_check_caps(ci, flags, NULL);
2927 }
2928 spin_unlock(&mdsc->cap_delay_lock);
2929}
2930
2931/*
2932 * Flush all dirty caps to the mds
2933 */
2934void ceph_flush_dirty_caps(struct ceph_mds_client *mdsc)
2935{
2936 struct ceph_inode_info *ci;
2937 struct inode *inode;
2938
2939 dout("flush_dirty_caps\n");
2940 spin_lock(&mdsc->cap_dirty_lock);
2941 while (!list_empty(&mdsc->cap_dirty)) {
2942 ci = list_first_entry(&mdsc->cap_dirty, struct ceph_inode_info,
2943 i_dirty_item);
2944 inode = &ci->vfs_inode;
2945 ihold(inode);
2946 dout("flush_dirty_caps %p\n", inode);
2947 spin_unlock(&mdsc->cap_dirty_lock);
2948 ceph_check_caps(ci, CHECK_CAPS_NODELAY|CHECK_CAPS_FLUSH, NULL);
2949 iput(inode);
2950 spin_lock(&mdsc->cap_dirty_lock);
2951 }
2952 spin_unlock(&mdsc->cap_dirty_lock);
2953 dout("flush_dirty_caps done\n");
2954}
2955
2956/*
2957 * Drop open file reference. If we were the last open file,
2958 * we may need to release capabilities to the MDS (or schedule
2959 * their delayed release).
2960 */
2961void ceph_put_fmode(struct ceph_inode_info *ci, int fmode)
2962{
2963 struct inode *inode = &ci->vfs_inode;
2964 int last = 0;
2965
2966 spin_lock(&ci->i_ceph_lock);
2967 dout("put_fmode %p fmode %d %d -> %d\n", inode, fmode,
2968 ci->i_nr_by_mode[fmode], ci->i_nr_by_mode[fmode]-1);
2969 BUG_ON(ci->i_nr_by_mode[fmode] == 0);
2970 if (--ci->i_nr_by_mode[fmode] == 0)
2971 last++;
2972 spin_unlock(&ci->i_ceph_lock);
2973
2974 if (last && ci->i_vino.snap == CEPH_NOSNAP)
2975 ceph_check_caps(ci, 0, NULL);
2976}
2977
2978/*
2979 * Helpers for embedding cap and dentry lease releases into mds
2980 * requests.
2981 *
2982 * @force is used by dentry_release (below) to force inclusion of a
2983 * record for the directory inode, even when there aren't any caps to
2984 * drop.
2985 */
2986int ceph_encode_inode_release(void **p, struct inode *inode,
2987 int mds, int drop, int unless, int force)
2988{
2989 struct ceph_inode_info *ci = ceph_inode(inode);
2990 struct ceph_cap *cap;
2991 struct ceph_mds_request_release *rel = *p;
2992 int used, dirty;
2993 int ret = 0;
2994
2995 spin_lock(&ci->i_ceph_lock);
2996 used = __ceph_caps_used(ci);
2997 dirty = __ceph_caps_dirty(ci);
2998
2999 dout("encode_inode_release %p mds%d used|dirty %s drop %s unless %s\n",
3000 inode, mds, ceph_cap_string(used|dirty), ceph_cap_string(drop),
3001 ceph_cap_string(unless));
3002
3003 /* only drop unused, clean caps */
3004 drop &= ~(used | dirty);
3005
3006 cap = __get_cap_for_mds(ci, mds);
3007 if (cap && __cap_is_valid(cap)) {
3008 if (force ||
3009 ((cap->issued & drop) &&
3010 (cap->issued & unless) == 0)) {
3011 if ((cap->issued & drop) &&
3012 (cap->issued & unless) == 0) {
3013 dout("encode_inode_release %p cap %p %s -> "
3014 "%s\n", inode, cap,
3015 ceph_cap_string(cap->issued),
3016 ceph_cap_string(cap->issued & ~drop));
3017 cap->issued &= ~drop;
3018 cap->implemented &= ~drop;
3019 if (ci->i_ceph_flags & CEPH_I_NODELAY) {
3020 int wanted = __ceph_caps_wanted(ci);
3021 dout(" wanted %s -> %s (act %s)\n",
3022 ceph_cap_string(cap->mds_wanted),
3023 ceph_cap_string(cap->mds_wanted &
3024 ~wanted),
3025 ceph_cap_string(wanted));
3026 cap->mds_wanted &= wanted;
3027 }
3028 } else {
3029 dout("encode_inode_release %p cap %p %s"
3030 " (force)\n", inode, cap,
3031 ceph_cap_string(cap->issued));
3032 }
3033
3034 rel->ino = cpu_to_le64(ceph_ino(inode));
3035 rel->cap_id = cpu_to_le64(cap->cap_id);
3036 rel->seq = cpu_to_le32(cap->seq);
3037 rel->issue_seq = cpu_to_le32(cap->issue_seq),
3038 rel->mseq = cpu_to_le32(cap->mseq);
3039 rel->caps = cpu_to_le32(cap->issued);
3040 rel->wanted = cpu_to_le32(cap->mds_wanted);
3041 rel->dname_len = 0;
3042 rel->dname_seq = 0;
3043 *p += sizeof(*rel);
3044 ret = 1;
3045 } else {
3046 dout("encode_inode_release %p cap %p %s\n",
3047 inode, cap, ceph_cap_string(cap->issued));
3048 }
3049 }
3050 spin_unlock(&ci->i_ceph_lock);
3051 return ret;
3052}
3053
3054int ceph_encode_dentry_release(void **p, struct dentry *dentry,
3055 int mds, int drop, int unless)
3056{
3057 struct inode *dir = dentry->d_parent->d_inode;
3058 struct ceph_mds_request_release *rel = *p;
3059 struct ceph_dentry_info *di = ceph_dentry(dentry);
3060 int force = 0;
3061 int ret;
3062
3063 /*
3064 * force an record for the directory caps if we have a dentry lease.
3065 * this is racy (can't take i_ceph_lock and d_lock together), but it
3066 * doesn't have to be perfect; the mds will revoke anything we don't
3067 * release.
3068 */
3069 spin_lock(&dentry->d_lock);
3070 if (di->lease_session && di->lease_session->s_mds == mds)
3071 force = 1;
3072 spin_unlock(&dentry->d_lock);
3073
3074 ret = ceph_encode_inode_release(p, dir, mds, drop, unless, force);
3075
3076 spin_lock(&dentry->d_lock);
3077 if (ret && di->lease_session && di->lease_session->s_mds == mds) {
3078 dout("encode_dentry_release %p mds%d seq %d\n",
3079 dentry, mds, (int)di->lease_seq);
3080 rel->dname_len = cpu_to_le32(dentry->d_name.len);
3081 memcpy(*p, dentry->d_name.name, dentry->d_name.len);
3082 *p += dentry->d_name.len;
3083 rel->dname_seq = cpu_to_le32(di->lease_seq);
3084 __ceph_mdsc_drop_dentry_lease(dentry);
3085 }
3086 spin_unlock(&dentry->d_lock);
3087 return ret;
3088}