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Merge tag 'regmap-fix-v5.11-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git...
[linux/fpc-iii.git] / fs / ceph / caps.c
blob255a512f1277ed50412e70776033b7f0b6afac19
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 #include <linux/iversion.h>
12
13 #include "super.h"
14 #include "mds_client.h"
15 #include "cache.h"
16 #include <linux/ceph/decode.h>
17 #include <linux/ceph/messenger.h>
18
19 /*
20 * Capability management
21 *
22 * The Ceph metadata servers control client access to inode metadata
23 * and file data by issuing capabilities, granting clients permission
24 * to read and/or write both inode field and file data to OSDs
25 * (storage nodes). Each capability consists of a set of bits
26 * indicating which operations are allowed.
27 *
28 * If the client holds a *_SHARED cap, the client has a coherent value
29 * that can be safely read from the cached inode.
30 *
31 * In the case of a *_EXCL (exclusive) or FILE_WR capabilities, the
32 * client is allowed to change inode attributes (e.g., file size,
33 * mtime), note its dirty state in the ceph_cap, and asynchronously
34 * flush that metadata change to the MDS.
35 *
36 * In the event of a conflicting operation (perhaps by another
37 * client), the MDS will revoke the conflicting client capabilities.
38 *
39 * In order for a client to cache an inode, it must hold a capability
40 * with at least one MDS server. When inodes are released, release
41 * notifications are batched and periodically sent en masse to the MDS
42 * cluster to release server state.
43 */
44
45 static u64 __get_oldest_flush_tid(struct ceph_mds_client *mdsc);
46 static void __kick_flushing_caps(struct ceph_mds_client *mdsc,
47 struct ceph_mds_session *session,
48 struct ceph_inode_info *ci,
49 u64 oldest_flush_tid);
50
51 /*
52 * Generate readable cap strings for debugging output.
53 */
54 #define MAX_CAP_STR 20
55 static char cap_str[MAX_CAP_STR][40];
56 static DEFINE_SPINLOCK(cap_str_lock);
57 static int last_cap_str;
58
59 static char *gcap_string(char *s, int c)
60 {
61 if (c & CEPH_CAP_GSHARED)
62 *s++ = 's';
63 if (c & CEPH_CAP_GEXCL)
64 *s++ = 'x';
65 if (c & CEPH_CAP_GCACHE)
66 *s++ = 'c';
67 if (c & CEPH_CAP_GRD)
68 *s++ = 'r';
69 if (c & CEPH_CAP_GWR)
70 *s++ = 'w';
71 if (c & CEPH_CAP_GBUFFER)
72 *s++ = 'b';
73 if (c & CEPH_CAP_GWREXTEND)
74 *s++ = 'a';
75 if (c & CEPH_CAP_GLAZYIO)
76 *s++ = 'l';
77 return s;
78 }
79
80 const char *ceph_cap_string(int caps)
81 {
82 int i;
83 char *s;
84 int c;
85
86 spin_lock(&cap_str_lock);
87 i = last_cap_str++;
88 if (last_cap_str == MAX_CAP_STR)
89 last_cap_str = 0;
90 spin_unlock(&cap_str_lock);
91
92 s = cap_str[i];
93
94 if (caps & CEPH_CAP_PIN)
95 *s++ = 'p';
96
97 c = (caps >> CEPH_CAP_SAUTH) & 3;
98 if (c) {
99 *s++ = 'A';
100 s = gcap_string(s, c);
101 }
102
103 c = (caps >> CEPH_CAP_SLINK) & 3;
104 if (c) {
105 *s++ = 'L';
106 s = gcap_string(s, c);
107 }
108
109 c = (caps >> CEPH_CAP_SXATTR) & 3;
110 if (c) {
111 *s++ = 'X';
112 s = gcap_string(s, c);
113 }
114
115 c = caps >> CEPH_CAP_SFILE;
116 if (c) {
117 *s++ = 'F';
118 s = gcap_string(s, c);
119 }
120
121 if (s == cap_str[i])
122 *s++ = '-';
123 *s = 0;
124 return cap_str[i];
125 }
126
127 void ceph_caps_init(struct ceph_mds_client *mdsc)
128 {
129 INIT_LIST_HEAD(&mdsc->caps_list);
130 spin_lock_init(&mdsc->caps_list_lock);
131 }
132
133 void ceph_caps_finalize(struct ceph_mds_client *mdsc)
134 {
135 struct ceph_cap *cap;
136
137 spin_lock(&mdsc->caps_list_lock);
138 while (!list_empty(&mdsc->caps_list)) {
139 cap = list_first_entry(&mdsc->caps_list,
140 struct ceph_cap, caps_item);
141 list_del(&cap->caps_item);
142 kmem_cache_free(ceph_cap_cachep, cap);
143 }
144 mdsc->caps_total_count = 0;
145 mdsc->caps_avail_count = 0;
146 mdsc->caps_use_count = 0;
147 mdsc->caps_reserve_count = 0;
148 mdsc->caps_min_count = 0;
149 spin_unlock(&mdsc->caps_list_lock);
150 }
151
152 void ceph_adjust_caps_max_min(struct ceph_mds_client *mdsc,
153 struct ceph_mount_options *fsopt)
154 {
155 spin_lock(&mdsc->caps_list_lock);
156 mdsc->caps_min_count = fsopt->max_readdir;
157 if (mdsc->caps_min_count < 1024)
158 mdsc->caps_min_count = 1024;
159 mdsc->caps_use_max = fsopt->caps_max;
160 if (mdsc->caps_use_max > 0 &&
161 mdsc->caps_use_max < mdsc->caps_min_count)
162 mdsc->caps_use_max = mdsc->caps_min_count;
163 spin_unlock(&mdsc->caps_list_lock);
164 }
165
166 static void __ceph_unreserve_caps(struct ceph_mds_client *mdsc, int nr_caps)
167 {
168 struct ceph_cap *cap;
169 int i;
170
171 if (nr_caps) {
172 BUG_ON(mdsc->caps_reserve_count < nr_caps);
173 mdsc->caps_reserve_count -= nr_caps;
174 if (mdsc->caps_avail_count >=
175 mdsc->caps_reserve_count + mdsc->caps_min_count) {
176 mdsc->caps_total_count -= nr_caps;
177 for (i = 0; i < nr_caps; i++) {
178 cap = list_first_entry(&mdsc->caps_list,
179 struct ceph_cap, caps_item);
180 list_del(&cap->caps_item);
181 kmem_cache_free(ceph_cap_cachep, cap);
182 }
183 } else {
184 mdsc->caps_avail_count += nr_caps;
185 }
186
187 dout("%s: caps %d = %d used + %d resv + %d avail\n",
188 __func__,
189 mdsc->caps_total_count, mdsc->caps_use_count,
190 mdsc->caps_reserve_count, mdsc->caps_avail_count);
191 BUG_ON(mdsc->caps_total_count != mdsc->caps_use_count +
192 mdsc->caps_reserve_count +
193 mdsc->caps_avail_count);
194 }
195 }
196
197 /*
198 * Called under mdsc->mutex.
199 */
200 int ceph_reserve_caps(struct ceph_mds_client *mdsc,
201 struct ceph_cap_reservation *ctx, int need)
202 {
203 int i, j;
204 struct ceph_cap *cap;
205 int have;
206 int alloc = 0;
207 int max_caps;
208 int err = 0;
209 bool trimmed = false;
210 struct ceph_mds_session *s;
211 LIST_HEAD(newcaps);
212
213 dout("reserve caps ctx=%p need=%d\n", ctx, need);
214
215 /* first reserve any caps that are already allocated */
216 spin_lock(&mdsc->caps_list_lock);
217 if (mdsc->caps_avail_count >= need)
218 have = need;
219 else
220 have = mdsc->caps_avail_count;
221 mdsc->caps_avail_count -= have;
222 mdsc->caps_reserve_count += have;
223 BUG_ON(mdsc->caps_total_count != mdsc->caps_use_count +
224 mdsc->caps_reserve_count +
225 mdsc->caps_avail_count);
226 spin_unlock(&mdsc->caps_list_lock);
227
228 for (i = have; i < need; ) {
229 cap = kmem_cache_alloc(ceph_cap_cachep, GFP_NOFS);
230 if (cap) {
231 list_add(&cap->caps_item, &newcaps);
232 alloc++;
233 i++;
234 continue;
235 }
236
237 if (!trimmed) {
238 for (j = 0; j < mdsc->max_sessions; j++) {
239 s = __ceph_lookup_mds_session(mdsc, j);
240 if (!s)
241 continue;
242 mutex_unlock(&mdsc->mutex);
243
244 mutex_lock(&s->s_mutex);
245 max_caps = s->s_nr_caps - (need - i);
246 ceph_trim_caps(mdsc, s, max_caps);
247 mutex_unlock(&s->s_mutex);
248
249 ceph_put_mds_session(s);
250 mutex_lock(&mdsc->mutex);
251 }
252 trimmed = true;
253
254 spin_lock(&mdsc->caps_list_lock);
255 if (mdsc->caps_avail_count) {
256 int more_have;
257 if (mdsc->caps_avail_count >= need - i)
258 more_have = need - i;
259 else
260 more_have = mdsc->caps_avail_count;
261
262 i += more_have;
263 have += more_have;
264 mdsc->caps_avail_count -= more_have;
265 mdsc->caps_reserve_count += more_have;
266
267 }
268 spin_unlock(&mdsc->caps_list_lock);
269
270 continue;
271 }
272
273 pr_warn("reserve caps ctx=%p ENOMEM need=%d got=%d\n",
274 ctx, need, have + alloc);
275 err = -ENOMEM;
276 break;
277 }
278
279 if (!err) {
280 BUG_ON(have + alloc != need);
281 ctx->count = need;
282 ctx->used = 0;
283 }
284
285 spin_lock(&mdsc->caps_list_lock);
286 mdsc->caps_total_count += alloc;
287 mdsc->caps_reserve_count += alloc;
288 list_splice(&newcaps, &mdsc->caps_list);
289
290 BUG_ON(mdsc->caps_total_count != mdsc->caps_use_count +
291 mdsc->caps_reserve_count +
292 mdsc->caps_avail_count);
293
294 if (err)
295 __ceph_unreserve_caps(mdsc, have + alloc);
296
297 spin_unlock(&mdsc->caps_list_lock);
298
299 dout("reserve caps ctx=%p %d = %d used + %d resv + %d avail\n",
300 ctx, mdsc->caps_total_count, mdsc->caps_use_count,
301 mdsc->caps_reserve_count, mdsc->caps_avail_count);
302 return err;
303 }
304
305 void ceph_unreserve_caps(struct ceph_mds_client *mdsc,
306 struct ceph_cap_reservation *ctx)
307 {
308 bool reclaim = false;
309 if (!ctx->count)
310 return;
311
312 dout("unreserve caps ctx=%p count=%d\n", ctx, ctx->count);
313 spin_lock(&mdsc->caps_list_lock);
314 __ceph_unreserve_caps(mdsc, ctx->count);
315 ctx->count = 0;
316
317 if (mdsc->caps_use_max > 0 &&
318 mdsc->caps_use_count > mdsc->caps_use_max)
319 reclaim = true;
320 spin_unlock(&mdsc->caps_list_lock);
321
322 if (reclaim)
323 ceph_reclaim_caps_nr(mdsc, ctx->used);
324 }
325
326 struct ceph_cap *ceph_get_cap(struct ceph_mds_client *mdsc,
327 struct ceph_cap_reservation *ctx)
328 {
329 struct ceph_cap *cap = NULL;
330
331 /* temporary, until we do something about cap import/export */
332 if (!ctx) {
333 cap = kmem_cache_alloc(ceph_cap_cachep, GFP_NOFS);
334 if (cap) {
335 spin_lock(&mdsc->caps_list_lock);
336 mdsc->caps_use_count++;
337 mdsc->caps_total_count++;
338 spin_unlock(&mdsc->caps_list_lock);
339 } else {
340 spin_lock(&mdsc->caps_list_lock);
341 if (mdsc->caps_avail_count) {
342 BUG_ON(list_empty(&mdsc->caps_list));
343
344 mdsc->caps_avail_count--;
345 mdsc->caps_use_count++;
346 cap = list_first_entry(&mdsc->caps_list,
347 struct ceph_cap, caps_item);
348 list_del(&cap->caps_item);
349
350 BUG_ON(mdsc->caps_total_count != mdsc->caps_use_count +
351 mdsc->caps_reserve_count + mdsc->caps_avail_count);
352 }
353 spin_unlock(&mdsc->caps_list_lock);
354 }
355
356 return cap;
357 }
358
359 spin_lock(&mdsc->caps_list_lock);
360 dout("get_cap ctx=%p (%d) %d = %d used + %d resv + %d avail\n",
361 ctx, ctx->count, mdsc->caps_total_count, mdsc->caps_use_count,
362 mdsc->caps_reserve_count, mdsc->caps_avail_count);
363 BUG_ON(!ctx->count);
364 BUG_ON(ctx->count > mdsc->caps_reserve_count);
365 BUG_ON(list_empty(&mdsc->caps_list));
366
367 ctx->count--;
368 ctx->used++;
369 mdsc->caps_reserve_count--;
370 mdsc->caps_use_count++;
371
372 cap = list_first_entry(&mdsc->caps_list, struct ceph_cap, caps_item);
373 list_del(&cap->caps_item);
374
375 BUG_ON(mdsc->caps_total_count != mdsc->caps_use_count +
376 mdsc->caps_reserve_count + mdsc->caps_avail_count);
377 spin_unlock(&mdsc->caps_list_lock);
378 return cap;
379 }
380
381 void ceph_put_cap(struct ceph_mds_client *mdsc, struct ceph_cap *cap)
382 {
383 spin_lock(&mdsc->caps_list_lock);
384 dout("put_cap %p %d = %d used + %d resv + %d avail\n",
385 cap, mdsc->caps_total_count, mdsc->caps_use_count,
386 mdsc->caps_reserve_count, mdsc->caps_avail_count);
387 mdsc->caps_use_count--;
388 /*
389 * Keep some preallocated caps around (ceph_min_count), to
390 * avoid lots of free/alloc churn.
391 */
392 if (mdsc->caps_avail_count >= mdsc->caps_reserve_count +
393 mdsc->caps_min_count) {
394 mdsc->caps_total_count--;
395 kmem_cache_free(ceph_cap_cachep, cap);
396 } else {
397 mdsc->caps_avail_count++;
398 list_add(&cap->caps_item, &mdsc->caps_list);
399 }
400
401 BUG_ON(mdsc->caps_total_count != mdsc->caps_use_count +
402 mdsc->caps_reserve_count + mdsc->caps_avail_count);
403 spin_unlock(&mdsc->caps_list_lock);
404 }
405
406 void ceph_reservation_status(struct ceph_fs_client *fsc,
407 int *total, int *avail, int *used, int *reserved,
408 int *min)
409 {
410 struct ceph_mds_client *mdsc = fsc->mdsc;
411
412 spin_lock(&mdsc->caps_list_lock);
413
414 if (total)
415 *total = mdsc->caps_total_count;
416 if (avail)
417 *avail = mdsc->caps_avail_count;
418 if (used)
419 *used = mdsc->caps_use_count;
420 if (reserved)
421 *reserved = mdsc->caps_reserve_count;
422 if (min)
423 *min = mdsc->caps_min_count;
424
425 spin_unlock(&mdsc->caps_list_lock);
426 }
427
428 /*
429 * Find ceph_cap for given mds, if any.
430 *
431 * Called with i_ceph_lock held.
432 */
433 static struct ceph_cap *__get_cap_for_mds(struct ceph_inode_info *ci, int mds)
434 {
435 struct ceph_cap *cap;
436 struct rb_node *n = ci->i_caps.rb_node;
437
438 while (n) {
439 cap = rb_entry(n, struct ceph_cap, ci_node);
440 if (mds < cap->mds)
441 n = n->rb_left;
442 else if (mds > cap->mds)
443 n = n->rb_right;
444 else
445 return cap;
446 }
447 return NULL;
448 }
449
450 struct ceph_cap *ceph_get_cap_for_mds(struct ceph_inode_info *ci, int mds)
451 {
452 struct ceph_cap *cap;
453
454 spin_lock(&ci->i_ceph_lock);
455 cap = __get_cap_for_mds(ci, mds);
456 spin_unlock(&ci->i_ceph_lock);
457 return cap;
458 }
459
460 /*
461 * Called under i_ceph_lock.
462 */
463 static void __insert_cap_node(struct ceph_inode_info *ci,
464 struct ceph_cap *new)
465 {
466 struct rb_node **p = &ci->i_caps.rb_node;
467 struct rb_node *parent = NULL;
468 struct ceph_cap *cap = NULL;
469
470 while (*p) {
471 parent = *p;
472 cap = rb_entry(parent, struct ceph_cap, ci_node);
473 if (new->mds < cap->mds)
474 p = &(*p)->rb_left;
475 else if (new->mds > cap->mds)
476 p = &(*p)->rb_right;
477 else
478 BUG();
479 }
480
481 rb_link_node(&new->ci_node, parent, p);
482 rb_insert_color(&new->ci_node, &ci->i_caps);
483 }
484
485 /*
486 * (re)set cap hold timeouts, which control the delayed release
487 * of unused caps back to the MDS. Should be called on cap use.
488 */
489 static void __cap_set_timeouts(struct ceph_mds_client *mdsc,
490 struct ceph_inode_info *ci)
491 {
492 struct ceph_mount_options *opt = mdsc->fsc->mount_options;
493 ci->i_hold_caps_max = round_jiffies(jiffies +
494 opt->caps_wanted_delay_max * HZ);
495 dout("__cap_set_timeouts %p %lu\n", &ci->vfs_inode,
496 ci->i_hold_caps_max - jiffies);
497 }
498
499 /*
500 * (Re)queue cap at the end of the delayed cap release list.
501 *
502 * If I_FLUSH is set, leave the inode at the front of the list.
503 *
504 * Caller holds i_ceph_lock
505 * -> we take mdsc->cap_delay_lock
506 */
507 static void __cap_delay_requeue(struct ceph_mds_client *mdsc,
508 struct ceph_inode_info *ci)
509 {
510 dout("__cap_delay_requeue %p flags 0x%lx at %lu\n", &ci->vfs_inode,
511 ci->i_ceph_flags, ci->i_hold_caps_max);
512 if (!mdsc->stopping) {
513 spin_lock(&mdsc->cap_delay_lock);
514 if (!list_empty(&ci->i_cap_delay_list)) {
515 if (ci->i_ceph_flags & CEPH_I_FLUSH)
516 goto no_change;
517 list_del_init(&ci->i_cap_delay_list);
518 }
519 __cap_set_timeouts(mdsc, ci);
520 list_add_tail(&ci->i_cap_delay_list, &mdsc->cap_delay_list);
521 no_change:
522 spin_unlock(&mdsc->cap_delay_lock);
523 }
524 }
525
526 /*
527 * Queue an inode for immediate writeback. Mark inode with I_FLUSH,
528 * indicating we should send a cap message to flush dirty metadata
529 * asap, and move to the front of the delayed cap list.
530 */
531 static void __cap_delay_requeue_front(struct ceph_mds_client *mdsc,
532 struct ceph_inode_info *ci)
533 {
534 dout("__cap_delay_requeue_front %p\n", &ci->vfs_inode);
535 spin_lock(&mdsc->cap_delay_lock);
536 ci->i_ceph_flags |= CEPH_I_FLUSH;
537 if (!list_empty(&ci->i_cap_delay_list))
538 list_del_init(&ci->i_cap_delay_list);
539 list_add(&ci->i_cap_delay_list, &mdsc->cap_delay_list);
540 spin_unlock(&mdsc->cap_delay_lock);
541 }
542
543 /*
544 * Cancel delayed work on cap.
545 *
546 * Caller must hold i_ceph_lock.
547 */
548 static void __cap_delay_cancel(struct ceph_mds_client *mdsc,
549 struct ceph_inode_info *ci)
550 {
551 dout("__cap_delay_cancel %p\n", &ci->vfs_inode);
552 if (list_empty(&ci->i_cap_delay_list))
553 return;
554 spin_lock(&mdsc->cap_delay_lock);
555 list_del_init(&ci->i_cap_delay_list);
556 spin_unlock(&mdsc->cap_delay_lock);
557 }
558
559 /* Common issue checks for add_cap, handle_cap_grant. */
560 static void __check_cap_issue(struct ceph_inode_info *ci, struct ceph_cap *cap,
561 unsigned issued)
562 {
563 unsigned had = __ceph_caps_issued(ci, NULL);
564
565 lockdep_assert_held(&ci->i_ceph_lock);
566
567 /*
568 * Each time we receive FILE_CACHE anew, we increment
569 * i_rdcache_gen.
570 */
571 if (S_ISREG(ci->vfs_inode.i_mode) &&
572 (issued & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) &&
573 (had & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) == 0) {
574 ci->i_rdcache_gen++;
575 }
576
577 /*
578 * If FILE_SHARED is newly issued, mark dir not complete. We don't
579 * know what happened to this directory while we didn't have the cap.
580 * If FILE_SHARED is being revoked, also mark dir not complete. It
581 * stops on-going cached readdir.
582 */
583 if ((issued & CEPH_CAP_FILE_SHARED) != (had & CEPH_CAP_FILE_SHARED)) {
584 if (issued & CEPH_CAP_FILE_SHARED)
585 atomic_inc(&ci->i_shared_gen);
586 if (S_ISDIR(ci->vfs_inode.i_mode)) {
587 dout(" marking %p NOT complete\n", &ci->vfs_inode);
588 __ceph_dir_clear_complete(ci);
589 }
590 }
591
592 /* Wipe saved layout if we're losing DIR_CREATE caps */
593 if (S_ISDIR(ci->vfs_inode.i_mode) && (had & CEPH_CAP_DIR_CREATE) &&
594 !(issued & CEPH_CAP_DIR_CREATE)) {
595 ceph_put_string(rcu_dereference_raw(ci->i_cached_layout.pool_ns));
596 memset(&ci->i_cached_layout, 0, sizeof(ci->i_cached_layout));
597 }
598 }
599
600 /**
601 * change_auth_cap_ses - move inode to appropriate lists when auth caps change
602 * @ci: inode to be moved
603 * @session: new auth caps session
604 */
605 static void change_auth_cap_ses(struct ceph_inode_info *ci,
606 struct ceph_mds_session *session)
607 {
608 lockdep_assert_held(&ci->i_ceph_lock);
609
610 if (list_empty(&ci->i_dirty_item) && list_empty(&ci->i_flushing_item))
611 return;
612
613 spin_lock(&session->s_mdsc->cap_dirty_lock);
614 if (!list_empty(&ci->i_dirty_item))
615 list_move(&ci->i_dirty_item, &session->s_cap_dirty);
616 if (!list_empty(&ci->i_flushing_item))
617 list_move_tail(&ci->i_flushing_item, &session->s_cap_flushing);
618 spin_unlock(&session->s_mdsc->cap_dirty_lock);
619 }
620
621 /*
622 * Add a capability under the given MDS session.
623 *
624 * Caller should hold session snap_rwsem (read) and ci->i_ceph_lock
625 *
626 * @fmode is the open file mode, if we are opening a file, otherwise
627 * it is < 0. (This is so we can atomically add the cap and add an
628 * open file reference to it.)
629 */
630 void ceph_add_cap(struct inode *inode,
631 struct ceph_mds_session *session, u64 cap_id,
632 unsigned issued, unsigned wanted,
633 unsigned seq, unsigned mseq, u64 realmino, int flags,
634 struct ceph_cap **new_cap)
635 {
636 struct ceph_mds_client *mdsc = ceph_inode_to_client(inode)->mdsc;
637 struct ceph_inode_info *ci = ceph_inode(inode);
638 struct ceph_cap *cap;
639 int mds = session->s_mds;
640 int actual_wanted;
641 u32 gen;
642
643 lockdep_assert_held(&ci->i_ceph_lock);
644
645 dout("add_cap %p mds%d cap %llx %s seq %d\n", inode,
646 session->s_mds, cap_id, ceph_cap_string(issued), seq);
647
648 spin_lock(&session->s_gen_ttl_lock);
649 gen = session->s_cap_gen;
650 spin_unlock(&session->s_gen_ttl_lock);
651
652 cap = __get_cap_for_mds(ci, mds);
653 if (!cap) {
654 cap = *new_cap;
655 *new_cap = NULL;
656
657 cap->issued = 0;
658 cap->implemented = 0;
659 cap->mds = mds;
660 cap->mds_wanted = 0;
661 cap->mseq = 0;
662
663 cap->ci = ci;
664 __insert_cap_node(ci, cap);
665
666 /* add to session cap list */
667 cap->session = session;
668 spin_lock(&session->s_cap_lock);
669 list_add_tail(&cap->session_caps, &session->s_caps);
670 session->s_nr_caps++;
671 atomic64_inc(&mdsc->metric.total_caps);
672 spin_unlock(&session->s_cap_lock);
673 } else {
674 spin_lock(&session->s_cap_lock);
675 list_move_tail(&cap->session_caps, &session->s_caps);
676 spin_unlock(&session->s_cap_lock);
677
678 if (cap->cap_gen < gen)
679 cap->issued = cap->implemented = CEPH_CAP_PIN;
680
681 /*
682 * auth mds of the inode changed. we received the cap export
683 * message, but still haven't received the cap import message.
684 * handle_cap_export() updated the new auth MDS' cap.
685 *
686 * "ceph_seq_cmp(seq, cap->seq) <= 0" means we are processing
687 * a message that was send before the cap import message. So
688 * don't remove caps.
689 */
690 if (ceph_seq_cmp(seq, cap->seq) <= 0) {
691 WARN_ON(cap != ci->i_auth_cap);
692 WARN_ON(cap->cap_id != cap_id);
693 seq = cap->seq;
694 mseq = cap->mseq;
695 issued |= cap->issued;
696 flags |= CEPH_CAP_FLAG_AUTH;
697 }
698 }
699
700 if (!ci->i_snap_realm ||
701 ((flags & CEPH_CAP_FLAG_AUTH) &&
702 realmino != (u64)-1 && ci->i_snap_realm->ino != realmino)) {
703 /*
704 * add this inode to the appropriate snap realm
705 */
706 struct ceph_snap_realm *realm = ceph_lookup_snap_realm(mdsc,
707 realmino);
708 if (realm) {
709 struct ceph_snap_realm *oldrealm = ci->i_snap_realm;
710 if (oldrealm) {
711 spin_lock(&oldrealm->inodes_with_caps_lock);
712 list_del_init(&ci->i_snap_realm_item);
713 spin_unlock(&oldrealm->inodes_with_caps_lock);
714 }
715
716 spin_lock(&realm->inodes_with_caps_lock);
717 list_add(&ci->i_snap_realm_item,
718 &realm->inodes_with_caps);
719 ci->i_snap_realm = realm;
720 if (realm->ino == ci->i_vino.ino)
721 realm->inode = inode;
722 spin_unlock(&realm->inodes_with_caps_lock);
723
724 if (oldrealm)
725 ceph_put_snap_realm(mdsc, oldrealm);
726 } else {
727 pr_err("ceph_add_cap: couldn't find snap realm %llx\n",
728 realmino);
729 WARN_ON(!realm);
730 }
731 }
732
733 __check_cap_issue(ci, cap, issued);
734
735 /*
736 * If we are issued caps we don't want, or the mds' wanted
737 * value appears to be off, queue a check so we'll release
738 * later and/or update the mds wanted value.
739 */
740 actual_wanted = __ceph_caps_wanted(ci);
741 if ((wanted & ~actual_wanted) ||
742 (issued & ~actual_wanted & CEPH_CAP_ANY_WR)) {
743 dout(" issued %s, mds wanted %s, actual %s, queueing\n",
744 ceph_cap_string(issued), ceph_cap_string(wanted),
745 ceph_cap_string(actual_wanted));
746 __cap_delay_requeue(mdsc, ci);
747 }
748
749 if (flags & CEPH_CAP_FLAG_AUTH) {
750 if (!ci->i_auth_cap ||
751 ceph_seq_cmp(ci->i_auth_cap->mseq, mseq) < 0) {
752 if (ci->i_auth_cap &&
753 ci->i_auth_cap->session != cap->session)
754 change_auth_cap_ses(ci, cap->session);
755 ci->i_auth_cap = cap;
756 cap->mds_wanted = wanted;
757 }
758 } else {
759 WARN_ON(ci->i_auth_cap == cap);
760 }
761
762 dout("add_cap inode %p (%llx.%llx) cap %p %s now %s seq %d mds%d\n",
763 inode, ceph_vinop(inode), cap, ceph_cap_string(issued),
764 ceph_cap_string(issued|cap->issued), seq, mds);
765 cap->cap_id = cap_id;
766 cap->issued = issued;
767 cap->implemented |= issued;
768 if (ceph_seq_cmp(mseq, cap->mseq) > 0)
769 cap->mds_wanted = wanted;
770 else
771 cap->mds_wanted |= wanted;
772 cap->seq = seq;
773 cap->issue_seq = seq;
774 cap->mseq = mseq;
775 cap->cap_gen = gen;
776 }
777
778 /*
779 * Return true if cap has not timed out and belongs to the current
780 * generation of the MDS session (i.e. has not gone 'stale' due to
781 * us losing touch with the mds).
782 */
783 static int __cap_is_valid(struct ceph_cap *cap)
784 {
785 unsigned long ttl;
786 u32 gen;
787
788 spin_lock(&cap->session->s_gen_ttl_lock);
789 gen = cap->session->s_cap_gen;
790 ttl = cap->session->s_cap_ttl;
791 spin_unlock(&cap->session->s_gen_ttl_lock);
792
793 if (cap->cap_gen < gen || time_after_eq(jiffies, ttl)) {
794 dout("__cap_is_valid %p cap %p issued %s "
795 "but STALE (gen %u vs %u)\n", &cap->ci->vfs_inode,
796 cap, ceph_cap_string(cap->issued), cap->cap_gen, gen);
797 return 0;
798 }
799
800 return 1;
801 }
802
803 /*
804 * Return set of valid cap bits issued to us. Note that caps time
805 * out, and may be invalidated in bulk if the client session times out
806 * and session->s_cap_gen is bumped.
807 */
808 int __ceph_caps_issued(struct ceph_inode_info *ci, int *implemented)
809 {
810 int have = ci->i_snap_caps;
811 struct ceph_cap *cap;
812 struct rb_node *p;
813
814 if (implemented)
815 *implemented = 0;
816 for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
817 cap = rb_entry(p, struct ceph_cap, ci_node);
818 if (!__cap_is_valid(cap))
819 continue;
820 dout("__ceph_caps_issued %p cap %p issued %s\n",
821 &ci->vfs_inode, cap, ceph_cap_string(cap->issued));
822 have |= cap->issued;
823 if (implemented)
824 *implemented |= cap->implemented;
825 }
826 /*
827 * exclude caps issued by non-auth MDS, but are been revoking
828 * by the auth MDS. The non-auth MDS should be revoking/exporting
829 * these caps, but the message is delayed.
830 */
831 if (ci->i_auth_cap) {
832 cap = ci->i_auth_cap;
833 have &= ~cap->implemented | cap->issued;
834 }
835 return have;
836 }
837
838 /*
839 * Get cap bits issued by caps other than @ocap
840 */
841 int __ceph_caps_issued_other(struct ceph_inode_info *ci, struct ceph_cap *ocap)
842 {
843 int have = ci->i_snap_caps;
844 struct ceph_cap *cap;
845 struct rb_node *p;
846
847 for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
848 cap = rb_entry(p, struct ceph_cap, ci_node);
849 if (cap == ocap)
850 continue;
851 if (!__cap_is_valid(cap))
852 continue;
853 have |= cap->issued;
854 }
855 return have;
856 }
857
858 /*
859 * Move a cap to the end of the LRU (oldest caps at list head, newest
860 * at list tail).
861 */
862 static void __touch_cap(struct ceph_cap *cap)
863 {
864 struct ceph_mds_session *s = cap->session;
865
866 spin_lock(&s->s_cap_lock);
867 if (!s->s_cap_iterator) {
868 dout("__touch_cap %p cap %p mds%d\n", &cap->ci->vfs_inode, cap,
869 s->s_mds);
870 list_move_tail(&cap->session_caps, &s->s_caps);
871 } else {
872 dout("__touch_cap %p cap %p mds%d NOP, iterating over caps\n",
873 &cap->ci->vfs_inode, cap, s->s_mds);
874 }
875 spin_unlock(&s->s_cap_lock);
876 }
877
878 /*
879 * Check if we hold the given mask. If so, move the cap(s) to the
880 * front of their respective LRUs. (This is the preferred way for
881 * callers to check for caps they want.)
882 */
883 int __ceph_caps_issued_mask(struct ceph_inode_info *ci, int mask, int touch)
884 {
885 struct ceph_cap *cap;
886 struct rb_node *p;
887 int have = ci->i_snap_caps;
888
889 if ((have & mask) == mask) {
890 dout("__ceph_caps_issued_mask ino 0x%llx snap issued %s"
891 " (mask %s)\n", ceph_ino(&ci->vfs_inode),
892 ceph_cap_string(have),
893 ceph_cap_string(mask));
894 return 1;
895 }
896
897 for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
898 cap = rb_entry(p, struct ceph_cap, ci_node);
899 if (!__cap_is_valid(cap))
900 continue;
901 if ((cap->issued & mask) == mask) {
902 dout("__ceph_caps_issued_mask ino 0x%llx cap %p issued %s"
903 " (mask %s)\n", ceph_ino(&ci->vfs_inode), cap,
904 ceph_cap_string(cap->issued),
905 ceph_cap_string(mask));
906 if (touch)
907 __touch_cap(cap);
908 return 1;
909 }
910
911 /* does a combination of caps satisfy mask? */
912 have |= cap->issued;
913 if ((have & mask) == mask) {
914 dout("__ceph_caps_issued_mask ino 0x%llx combo issued %s"
915 " (mask %s)\n", ceph_ino(&ci->vfs_inode),
916 ceph_cap_string(cap->issued),
917 ceph_cap_string(mask));
918 if (touch) {
919 struct rb_node *q;
920
921 /* touch this + preceding caps */
922 __touch_cap(cap);
923 for (q = rb_first(&ci->i_caps); q != p;
924 q = rb_next(q)) {
925 cap = rb_entry(q, struct ceph_cap,
926 ci_node);
927 if (!__cap_is_valid(cap))
928 continue;
929 if (cap->issued & mask)
930 __touch_cap(cap);
931 }
932 }
933 return 1;
934 }
935 }
936
937 return 0;
938 }
939
940 int __ceph_caps_issued_mask_metric(struct ceph_inode_info *ci, int mask,
941 int touch)
942 {
943 struct ceph_fs_client *fsc = ceph_sb_to_client(ci->vfs_inode.i_sb);
944 int r;
945
946 r = __ceph_caps_issued_mask(ci, mask, touch);
947 if (r)
948 ceph_update_cap_hit(&fsc->mdsc->metric);
949 else
950 ceph_update_cap_mis(&fsc->mdsc->metric);
951 return r;
952 }
953
954 /*
955 * Return true if mask caps are currently being revoked by an MDS.
956 */
957 int __ceph_caps_revoking_other(struct ceph_inode_info *ci,
958 struct ceph_cap *ocap, int mask)
959 {
960 struct ceph_cap *cap;
961 struct rb_node *p;
962
963 for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
964 cap = rb_entry(p, struct ceph_cap, ci_node);
965 if (cap != ocap &&
966 (cap->implemented & ~cap->issued & mask))
967 return 1;
968 }
969 return 0;
970 }
971
972 int ceph_caps_revoking(struct ceph_inode_info *ci, int mask)
973 {
974 struct inode *inode = &ci->vfs_inode;
975 int ret;
976
977 spin_lock(&ci->i_ceph_lock);
978 ret = __ceph_caps_revoking_other(ci, NULL, mask);
979 spin_unlock(&ci->i_ceph_lock);
980 dout("ceph_caps_revoking %p %s = %d\n", inode,
981 ceph_cap_string(mask), ret);
982 return ret;
983 }
984
985 int __ceph_caps_used(struct ceph_inode_info *ci)
986 {
987 int used = 0;
988 if (ci->i_pin_ref)
989 used |= CEPH_CAP_PIN;
990 if (ci->i_rd_ref)
991 used |= CEPH_CAP_FILE_RD;
992 if (ci->i_rdcache_ref ||
993 (S_ISREG(ci->vfs_inode.i_mode) &&
994 ci->vfs_inode.i_data.nrpages))
995 used |= CEPH_CAP_FILE_CACHE;
996 if (ci->i_wr_ref)
997 used |= CEPH_CAP_FILE_WR;
998 if (ci->i_wb_ref || ci->i_wrbuffer_ref)
999 used |= CEPH_CAP_FILE_BUFFER;
1000 if (ci->i_fx_ref)
1001 used |= CEPH_CAP_FILE_EXCL;
1002 return used;
1003 }
1004
1005 #define FMODE_WAIT_BIAS 1000
1006
1007 /*
1008 * wanted, by virtue of open file modes
1009 */
1010 int __ceph_caps_file_wanted(struct ceph_inode_info *ci)
1011 {
1012 const int PIN_SHIFT = ffs(CEPH_FILE_MODE_PIN);
1013 const int RD_SHIFT = ffs(CEPH_FILE_MODE_RD);
1014 const int WR_SHIFT = ffs(CEPH_FILE_MODE_WR);
1015 const int LAZY_SHIFT = ffs(CEPH_FILE_MODE_LAZY);
1016 struct ceph_mount_options *opt =
1017 ceph_inode_to_client(&ci->vfs_inode)->mount_options;
1018 unsigned long used_cutoff = jiffies - opt->caps_wanted_delay_max * HZ;
1019 unsigned long idle_cutoff = jiffies - opt->caps_wanted_delay_min * HZ;
1020
1021 if (S_ISDIR(ci->vfs_inode.i_mode)) {
1022 int want = 0;
1023
1024 /* use used_cutoff here, to keep dir's wanted caps longer */
1025 if (ci->i_nr_by_mode[RD_SHIFT] > 0 ||
1026 time_after(ci->i_last_rd, used_cutoff))
1027 want |= CEPH_CAP_ANY_SHARED;
1028
1029 if (ci->i_nr_by_mode[WR_SHIFT] > 0 ||
1030 time_after(ci->i_last_wr, used_cutoff)) {
1031 want |= CEPH_CAP_ANY_SHARED | CEPH_CAP_FILE_EXCL;
1032 if (opt->flags & CEPH_MOUNT_OPT_ASYNC_DIROPS)
1033 want |= CEPH_CAP_ANY_DIR_OPS;
1034 }
1035
1036 if (want || ci->i_nr_by_mode[PIN_SHIFT] > 0)
1037 want |= CEPH_CAP_PIN;
1038
1039 return want;
1040 } else {
1041 int bits = 0;
1042
1043 if (ci->i_nr_by_mode[RD_SHIFT] > 0) {
1044 if (ci->i_nr_by_mode[RD_SHIFT] >= FMODE_WAIT_BIAS ||
1045 time_after(ci->i_last_rd, used_cutoff))
1046 bits |= 1 << RD_SHIFT;
1047 } else if (time_after(ci->i_last_rd, idle_cutoff)) {
1048 bits |= 1 << RD_SHIFT;
1049 }
1050
1051 if (ci->i_nr_by_mode[WR_SHIFT] > 0) {
1052 if (ci->i_nr_by_mode[WR_SHIFT] >= FMODE_WAIT_BIAS ||
1053 time_after(ci->i_last_wr, used_cutoff))
1054 bits |= 1 << WR_SHIFT;
1055 } else if (time_after(ci->i_last_wr, idle_cutoff)) {
1056 bits |= 1 << WR_SHIFT;
1057 }
1058
1059 /* check lazyio only when read/write is wanted */
1060 if ((bits & (CEPH_FILE_MODE_RDWR << 1)) &&
1061 ci->i_nr_by_mode[LAZY_SHIFT] > 0)
1062 bits |= 1 << LAZY_SHIFT;
1063
1064 return bits ? ceph_caps_for_mode(bits >> 1) : 0;
1065 }
1066 }
1067
1068 /*
1069 * wanted, by virtue of open file modes AND cap refs (buffered/cached data)
1070 */
1071 int __ceph_caps_wanted(struct ceph_inode_info *ci)
1072 {
1073 int w = __ceph_caps_file_wanted(ci) | __ceph_caps_used(ci);
1074 if (S_ISDIR(ci->vfs_inode.i_mode)) {
1075 /* we want EXCL if holding caps of dir ops */
1076 if (w & CEPH_CAP_ANY_DIR_OPS)
1077 w |= CEPH_CAP_FILE_EXCL;
1078 } else {
1079 /* we want EXCL if dirty data */
1080 if (w & CEPH_CAP_FILE_BUFFER)
1081 w |= CEPH_CAP_FILE_EXCL;
1082 }
1083 return w;
1084 }
1085
1086 /*
1087 * Return caps we have registered with the MDS(s) as 'wanted'.
1088 */
1089 int __ceph_caps_mds_wanted(struct ceph_inode_info *ci, bool check)
1090 {
1091 struct ceph_cap *cap;
1092 struct rb_node *p;
1093 int mds_wanted = 0;
1094
1095 for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
1096 cap = rb_entry(p, struct ceph_cap, ci_node);
1097 if (check && !__cap_is_valid(cap))
1098 continue;
1099 if (cap == ci->i_auth_cap)
1100 mds_wanted |= cap->mds_wanted;
1101 else
1102 mds_wanted |= (cap->mds_wanted & ~CEPH_CAP_ANY_FILE_WR);
1103 }
1104 return mds_wanted;
1105 }
1106
1107 int ceph_is_any_caps(struct inode *inode)
1108 {
1109 struct ceph_inode_info *ci = ceph_inode(inode);
1110 int ret;
1111
1112 spin_lock(&ci->i_ceph_lock);
1113 ret = __ceph_is_any_real_caps(ci);
1114 spin_unlock(&ci->i_ceph_lock);
1115
1116 return ret;
1117 }
1118
1119 static void drop_inode_snap_realm(struct ceph_inode_info *ci)
1120 {
1121 struct ceph_snap_realm *realm = ci->i_snap_realm;
1122 spin_lock(&realm->inodes_with_caps_lock);
1123 list_del_init(&ci->i_snap_realm_item);
1124 ci->i_snap_realm_counter++;
1125 ci->i_snap_realm = NULL;
1126 if (realm->ino == ci->i_vino.ino)
1127 realm->inode = NULL;
1128 spin_unlock(&realm->inodes_with_caps_lock);
1129 ceph_put_snap_realm(ceph_sb_to_client(ci->vfs_inode.i_sb)->mdsc,
1130 realm);
1131 }
1132
1133 /*
1134 * Remove a cap. Take steps to deal with a racing iterate_session_caps.
1135 *
1136 * caller should hold i_ceph_lock.
1137 * caller will not hold session s_mutex if called from destroy_inode.
1138 */
1139 void __ceph_remove_cap(struct ceph_cap *cap, bool queue_release)
1140 {
1141 struct ceph_mds_session *session = cap->session;
1142 struct ceph_inode_info *ci = cap->ci;
1143 struct ceph_mds_client *mdsc;
1144 int removed = 0;
1145
1146 /* 'ci' being NULL means the remove have already occurred */
1147 if (!ci) {
1148 dout("%s: cap inode is NULL\n", __func__);
1149 return;
1150 }
1151
1152 dout("__ceph_remove_cap %p from %p\n", cap, &ci->vfs_inode);
1153
1154 mdsc = ceph_inode_to_client(&ci->vfs_inode)->mdsc;
1155
1156 /* remove from inode's cap rbtree, and clear auth cap */
1157 rb_erase(&cap->ci_node, &ci->i_caps);
1158 if (ci->i_auth_cap == cap) {
1159 WARN_ON_ONCE(!list_empty(&ci->i_dirty_item) &&
1160 !mdsc->fsc->blocklisted);
1161 ci->i_auth_cap = NULL;
1162 }
1163
1164 /* remove from session list */
1165 spin_lock(&session->s_cap_lock);
1166 if (session->s_cap_iterator == cap) {
1167 /* not yet, we are iterating over this very cap */
1168 dout("__ceph_remove_cap delaying %p removal from session %p\n",
1169 cap, cap->session);
1170 } else {
1171 list_del_init(&cap->session_caps);
1172 session->s_nr_caps--;
1173 atomic64_dec(&mdsc->metric.total_caps);
1174 cap->session = NULL;
1175 removed = 1;
1176 }
1177 /* protect backpointer with s_cap_lock: see iterate_session_caps */
1178 cap->ci = NULL;
1179
1180 /*
1181 * s_cap_reconnect is protected by s_cap_lock. no one changes
1182 * s_cap_gen while session is in the reconnect state.
1183 */
1184 if (queue_release &&
1185 (!session->s_cap_reconnect || cap->cap_gen == session->s_cap_gen)) {
1186 cap->queue_release = 1;
1187 if (removed) {
1188 __ceph_queue_cap_release(session, cap);
1189 removed = 0;
1190 }
1191 } else {
1192 cap->queue_release = 0;
1193 }
1194 cap->cap_ino = ci->i_vino.ino;
1195
1196 spin_unlock(&session->s_cap_lock);
1197
1198 if (removed)
1199 ceph_put_cap(mdsc, cap);
1200
1201 if (!__ceph_is_any_real_caps(ci)) {
1202 /* when reconnect denied, we remove session caps forcibly,
1203 * i_wr_ref can be non-zero. If there are ongoing write,
1204 * keep i_snap_realm.
1205 */
1206 if (ci->i_wr_ref == 0 && ci->i_snap_realm)
1207 drop_inode_snap_realm(ci);
1208
1209 __cap_delay_cancel(mdsc, ci);
1210 }
1211 }
1212
1213 struct cap_msg_args {
1214 struct ceph_mds_session *session;
1215 u64 ino, cid, follows;
1216 u64 flush_tid, oldest_flush_tid, size, max_size;
1217 u64 xattr_version;
1218 u64 change_attr;
1219 struct ceph_buffer *xattr_buf;
1220 struct ceph_buffer *old_xattr_buf;
1221 struct timespec64 atime, mtime, ctime, btime;
1222 int op, caps, wanted, dirty;
1223 u32 seq, issue_seq, mseq, time_warp_seq;
1224 u32 flags;
1225 kuid_t uid;
1226 kgid_t gid;
1227 umode_t mode;
1228 bool inline_data;
1229 bool wake;
1230 };
1231
1232 /*
1233 * cap struct size + flock buffer size + inline version + inline data size +
1234 * osd_epoch_barrier + oldest_flush_tid
1235 */
1236 #define CAP_MSG_SIZE (sizeof(struct ceph_mds_caps) + \
1237 4 + 8 + 4 + 4 + 8 + 4 + 4 + 4 + 8 + 8 + 4)
1238
1239 /* Marshal up the cap msg to the MDS */
1240 static void encode_cap_msg(struct ceph_msg *msg, struct cap_msg_args *arg)
1241 {
1242 struct ceph_mds_caps *fc;
1243 void *p;
1244 struct ceph_osd_client *osdc = &arg->session->s_mdsc->fsc->client->osdc;
1245
1246 dout("%s %s %llx %llx caps %s wanted %s dirty %s seq %u/%u tid %llu/%llu mseq %u follows %lld size %llu/%llu xattr_ver %llu xattr_len %d\n",
1247 __func__, ceph_cap_op_name(arg->op), arg->cid, arg->ino,
1248 ceph_cap_string(arg->caps), ceph_cap_string(arg->wanted),
1249 ceph_cap_string(arg->dirty), arg->seq, arg->issue_seq,
1250 arg->flush_tid, arg->oldest_flush_tid, arg->mseq, arg->follows,
1251 arg->size, arg->max_size, arg->xattr_version,
1252 arg->xattr_buf ? (int)arg->xattr_buf->vec.iov_len : 0);
1253
1254 msg->hdr.version = cpu_to_le16(10);
1255 msg->hdr.tid = cpu_to_le64(arg->flush_tid);
1256
1257 fc = msg->front.iov_base;
1258 memset(fc, 0, sizeof(*fc));
1259
1260 fc->cap_id = cpu_to_le64(arg->cid);
1261 fc->op = cpu_to_le32(arg->op);
1262 fc->seq = cpu_to_le32(arg->seq);
1263 fc->issue_seq = cpu_to_le32(arg->issue_seq);
1264 fc->migrate_seq = cpu_to_le32(arg->mseq);
1265 fc->caps = cpu_to_le32(arg->caps);
1266 fc->wanted = cpu_to_le32(arg->wanted);
1267 fc->dirty = cpu_to_le32(arg->dirty);
1268 fc->ino = cpu_to_le64(arg->ino);
1269 fc->snap_follows = cpu_to_le64(arg->follows);
1270
1271 fc->size = cpu_to_le64(arg->size);
1272 fc->max_size = cpu_to_le64(arg->max_size);
1273 ceph_encode_timespec64(&fc->mtime, &arg->mtime);
1274 ceph_encode_timespec64(&fc->atime, &arg->atime);
1275 ceph_encode_timespec64(&fc->ctime, &arg->ctime);
1276 fc->time_warp_seq = cpu_to_le32(arg->time_warp_seq);
1277
1278 fc->uid = cpu_to_le32(from_kuid(&init_user_ns, arg->uid));
1279 fc->gid = cpu_to_le32(from_kgid(&init_user_ns, arg->gid));
1280 fc->mode = cpu_to_le32(arg->mode);
1281
1282 fc->xattr_version = cpu_to_le64(arg->xattr_version);
1283 if (arg->xattr_buf) {
1284 msg->middle = ceph_buffer_get(arg->xattr_buf);
1285 fc->xattr_len = cpu_to_le32(arg->xattr_buf->vec.iov_len);
1286 msg->hdr.middle_len = cpu_to_le32(arg->xattr_buf->vec.iov_len);
1287 }
1288
1289 p = fc + 1;
1290 /* flock buffer size (version 2) */
1291 ceph_encode_32(&p, 0);
1292 /* inline version (version 4) */
1293 ceph_encode_64(&p, arg->inline_data ? 0 : CEPH_INLINE_NONE);
1294 /* inline data size */
1295 ceph_encode_32(&p, 0);
1296 /*
1297 * osd_epoch_barrier (version 5)
1298 * The epoch_barrier is protected osdc->lock, so READ_ONCE here in
1299 * case it was recently changed
1300 */
1301 ceph_encode_32(&p, READ_ONCE(osdc->epoch_barrier));
1302 /* oldest_flush_tid (version 6) */
1303 ceph_encode_64(&p, arg->oldest_flush_tid);
1304
1305 /*
1306 * caller_uid/caller_gid (version 7)
1307 *
1308 * Currently, we don't properly track which caller dirtied the caps
1309 * last, and force a flush of them when there is a conflict. For now,
1310 * just set this to 0:0, to emulate how the MDS has worked up to now.
1311 */
1312 ceph_encode_32(&p, 0);
1313 ceph_encode_32(&p, 0);
1314
1315 /* pool namespace (version 8) (mds always ignores this) */
1316 ceph_encode_32(&p, 0);
1317
1318 /* btime and change_attr (version 9) */
1319 ceph_encode_timespec64(p, &arg->btime);
1320 p += sizeof(struct ceph_timespec);
1321 ceph_encode_64(&p, arg->change_attr);
1322
1323 /* Advisory flags (version 10) */
1324 ceph_encode_32(&p, arg->flags);
1325 }
1326
1327 /*
1328 * Queue cap releases when an inode is dropped from our cache.
1329 */
1330 void __ceph_remove_caps(struct ceph_inode_info *ci)
1331 {
1332 struct rb_node *p;
1333
1334 /* lock i_ceph_lock, because ceph_d_revalidate(..., LOOKUP_RCU)
1335 * may call __ceph_caps_issued_mask() on a freeing inode. */
1336 spin_lock(&ci->i_ceph_lock);
1337 p = rb_first(&ci->i_caps);
1338 while (p) {
1339 struct ceph_cap *cap = rb_entry(p, struct ceph_cap, ci_node);
1340 p = rb_next(p);
1341 __ceph_remove_cap(cap, true);
1342 }
1343 spin_unlock(&ci->i_ceph_lock);
1344 }
1345
1346 /*
1347 * Prepare to send a cap message to an MDS. Update the cap state, and populate
1348 * the arg struct with the parameters that will need to be sent. This should
1349 * be done under the i_ceph_lock to guard against changes to cap state.
1350 *
1351 * Make note of max_size reported/requested from mds, revoked caps
1352 * that have now been implemented.
1353 */
1354 static void __prep_cap(struct cap_msg_args *arg, struct ceph_cap *cap,
1355 int op, int flags, int used, int want, int retain,
1356 int flushing, u64 flush_tid, u64 oldest_flush_tid)
1357 {
1358 struct ceph_inode_info *ci = cap->ci;
1359 struct inode *inode = &ci->vfs_inode;
1360 int held, revoking;
1361
1362 lockdep_assert_held(&ci->i_ceph_lock);
1363
1364 held = cap->issued | cap->implemented;
1365 revoking = cap->implemented & ~cap->issued;
1366 retain &= ~revoking;
1367
1368 dout("%s %p cap %p session %p %s -> %s (revoking %s)\n",
1369 __func__, inode, cap, cap->session,
1370 ceph_cap_string(held), ceph_cap_string(held & retain),
1371 ceph_cap_string(revoking));
1372 BUG_ON((retain & CEPH_CAP_PIN) == 0);
1373
1374 ci->i_ceph_flags &= ~CEPH_I_FLUSH;
1375
1376 cap->issued &= retain; /* drop bits we don't want */
1377 /*
1378 * Wake up any waiters on wanted -> needed transition. This is due to
1379 * the weird transition from buffered to sync IO... we need to flush
1380 * dirty pages _before_ allowing sync writes to avoid reordering.
1381 */
1382 arg->wake = cap->implemented & ~cap->issued;
1383 cap->implemented &= cap->issued | used;
1384 cap->mds_wanted = want;
1385
1386 arg->session = cap->session;
1387 arg->ino = ceph_vino(inode).ino;
1388 arg->cid = cap->cap_id;
1389 arg->follows = flushing ? ci->i_head_snapc->seq : 0;
1390 arg->flush_tid = flush_tid;
1391 arg->oldest_flush_tid = oldest_flush_tid;
1392
1393 arg->size = inode->i_size;
1394 ci->i_reported_size = arg->size;
1395 arg->max_size = ci->i_wanted_max_size;
1396 if (cap == ci->i_auth_cap) {
1397 if (want & CEPH_CAP_ANY_FILE_WR)
1398 ci->i_requested_max_size = arg->max_size;
1399 else
1400 ci->i_requested_max_size = 0;
1401 }
1402
1403 if (flushing & CEPH_CAP_XATTR_EXCL) {
1404 arg->old_xattr_buf = __ceph_build_xattrs_blob(ci);
1405 arg->xattr_version = ci->i_xattrs.version;
1406 arg->xattr_buf = ci->i_xattrs.blob;
1407 } else {
1408 arg->xattr_buf = NULL;
1409 arg->old_xattr_buf = NULL;
1410 }
1411
1412 arg->mtime = inode->i_mtime;
1413 arg->atime = inode->i_atime;
1414 arg->ctime = inode->i_ctime;
1415 arg->btime = ci->i_btime;
1416 arg->change_attr = inode_peek_iversion_raw(inode);
1417
1418 arg->op = op;
1419 arg->caps = cap->implemented;
1420 arg->wanted = want;
1421 arg->dirty = flushing;
1422
1423 arg->seq = cap->seq;
1424 arg->issue_seq = cap->issue_seq;
1425 arg->mseq = cap->mseq;
1426 arg->time_warp_seq = ci->i_time_warp_seq;
1427
1428 arg->uid = inode->i_uid;
1429 arg->gid = inode->i_gid;
1430 arg->mode = inode->i_mode;
1431
1432 arg->inline_data = ci->i_inline_version != CEPH_INLINE_NONE;
1433 if (!(flags & CEPH_CLIENT_CAPS_PENDING_CAPSNAP) &&
1434 !list_empty(&ci->i_cap_snaps)) {
1435 struct ceph_cap_snap *capsnap;
1436 list_for_each_entry_reverse(capsnap, &ci->i_cap_snaps, ci_item) {
1437 if (capsnap->cap_flush.tid)
1438 break;
1439 if (capsnap->need_flush) {
1440 flags |= CEPH_CLIENT_CAPS_PENDING_CAPSNAP;
1441 break;
1442 }
1443 }
1444 }
1445 arg->flags = flags;
1446 }
1447
1448 /*
1449 * Send a cap msg on the given inode.
1450 *
1451 * Caller should hold snap_rwsem (read), s_mutex.
1452 */
1453 static void __send_cap(struct cap_msg_args *arg, struct ceph_inode_info *ci)
1454 {
1455 struct ceph_msg *msg;
1456 struct inode *inode = &ci->vfs_inode;
1457
1458 msg = ceph_msg_new(CEPH_MSG_CLIENT_CAPS, CAP_MSG_SIZE, GFP_NOFS, false);
1459 if (!msg) {
1460 pr_err("error allocating cap msg: ino (%llx.%llx) flushing %s tid %llu, requeuing cap.\n",
1461 ceph_vinop(inode), ceph_cap_string(arg->dirty),
1462 arg->flush_tid);
1463 spin_lock(&ci->i_ceph_lock);
1464 __cap_delay_requeue(arg->session->s_mdsc, ci);
1465 spin_unlock(&ci->i_ceph_lock);
1466 return;
1467 }
1468
1469 encode_cap_msg(msg, arg);
1470 ceph_con_send(&arg->session->s_con, msg);
1471 ceph_buffer_put(arg->old_xattr_buf);
1472 if (arg->wake)
1473 wake_up_all(&ci->i_cap_wq);
1474 }
1475
1476 static inline int __send_flush_snap(struct inode *inode,
1477 struct ceph_mds_session *session,
1478 struct ceph_cap_snap *capsnap,
1479 u32 mseq, u64 oldest_flush_tid)
1480 {
1481 struct cap_msg_args arg;
1482 struct ceph_msg *msg;
1483
1484 msg = ceph_msg_new(CEPH_MSG_CLIENT_CAPS, CAP_MSG_SIZE, GFP_NOFS, false);
1485 if (!msg)
1486 return -ENOMEM;
1487
1488 arg.session = session;
1489 arg.ino = ceph_vino(inode).ino;
1490 arg.cid = 0;
1491 arg.follows = capsnap->follows;
1492 arg.flush_tid = capsnap->cap_flush.tid;
1493 arg.oldest_flush_tid = oldest_flush_tid;
1494
1495 arg.size = capsnap->size;
1496 arg.max_size = 0;
1497 arg.xattr_version = capsnap->xattr_version;
1498 arg.xattr_buf = capsnap->xattr_blob;
1499 arg.old_xattr_buf = NULL;
1500
1501 arg.atime = capsnap->atime;
1502 arg.mtime = capsnap->mtime;
1503 arg.ctime = capsnap->ctime;
1504 arg.btime = capsnap->btime;
1505 arg.change_attr = capsnap->change_attr;
1506
1507 arg.op = CEPH_CAP_OP_FLUSHSNAP;
1508 arg.caps = capsnap->issued;
1509 arg.wanted = 0;
1510 arg.dirty = capsnap->dirty;
1511
1512 arg.seq = 0;
1513 arg.issue_seq = 0;
1514 arg.mseq = mseq;
1515 arg.time_warp_seq = capsnap->time_warp_seq;
1516
1517 arg.uid = capsnap->uid;
1518 arg.gid = capsnap->gid;
1519 arg.mode = capsnap->mode;
1520
1521 arg.inline_data = capsnap->inline_data;
1522 arg.flags = 0;
1523 arg.wake = false;
1524
1525 encode_cap_msg(msg, &arg);
1526 ceph_con_send(&arg.session->s_con, msg);
1527 return 0;
1528 }
1529
1530 /*
1531 * When a snapshot is taken, clients accumulate dirty metadata on
1532 * inodes with capabilities in ceph_cap_snaps to describe the file
1533 * state at the time the snapshot was taken. This must be flushed
1534 * asynchronously back to the MDS once sync writes complete and dirty
1535 * data is written out.
1536 *
1537 * Called under i_ceph_lock. Takes s_mutex as needed.
1538 */
1539 static void __ceph_flush_snaps(struct ceph_inode_info *ci,
1540 struct ceph_mds_session *session)
1541 __releases(ci->i_ceph_lock)
1542 __acquires(ci->i_ceph_lock)
1543 {
1544 struct inode *inode = &ci->vfs_inode;
1545 struct ceph_mds_client *mdsc = session->s_mdsc;
1546 struct ceph_cap_snap *capsnap;
1547 u64 oldest_flush_tid = 0;
1548 u64 first_tid = 1, last_tid = 0;
1549
1550 dout("__flush_snaps %p session %p\n", inode, session);
1551
1552 list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) {
1553 /*
1554 * we need to wait for sync writes to complete and for dirty
1555 * pages to be written out.
1556 */
1557 if (capsnap->dirty_pages || capsnap->writing)
1558 break;
1559
1560 /* should be removed by ceph_try_drop_cap_snap() */
1561 BUG_ON(!capsnap->need_flush);
1562
1563 /* only flush each capsnap once */
1564 if (capsnap->cap_flush.tid > 0) {
1565 dout(" already flushed %p, skipping\n", capsnap);
1566 continue;
1567 }
1568
1569 spin_lock(&mdsc->cap_dirty_lock);
1570 capsnap->cap_flush.tid = ++mdsc->last_cap_flush_tid;
1571 list_add_tail(&capsnap->cap_flush.g_list,
1572 &mdsc->cap_flush_list);
1573 if (oldest_flush_tid == 0)
1574 oldest_flush_tid = __get_oldest_flush_tid(mdsc);
1575 if (list_empty(&ci->i_flushing_item)) {
1576 list_add_tail(&ci->i_flushing_item,
1577 &session->s_cap_flushing);
1578 }
1579 spin_unlock(&mdsc->cap_dirty_lock);
1580
1581 list_add_tail(&capsnap->cap_flush.i_list,
1582 &ci->i_cap_flush_list);
1583
1584 if (first_tid == 1)
1585 first_tid = capsnap->cap_flush.tid;
1586 last_tid = capsnap->cap_flush.tid;
1587 }
1588
1589 ci->i_ceph_flags &= ~CEPH_I_FLUSH_SNAPS;
1590
1591 while (first_tid <= last_tid) {
1592 struct ceph_cap *cap = ci->i_auth_cap;
1593 struct ceph_cap_flush *cf;
1594 int ret;
1595
1596 if (!(cap && cap->session == session)) {
1597 dout("__flush_snaps %p auth cap %p not mds%d, "
1598 "stop\n", inode, cap, session->s_mds);
1599 break;
1600 }
1601
1602 ret = -ENOENT;
1603 list_for_each_entry(cf, &ci->i_cap_flush_list, i_list) {
1604 if (cf->tid >= first_tid) {
1605 ret = 0;
1606 break;
1607 }
1608 }
1609 if (ret < 0)
1610 break;
1611
1612 first_tid = cf->tid + 1;
1613
1614 capsnap = container_of(cf, struct ceph_cap_snap, cap_flush);
1615 refcount_inc(&capsnap->nref);
1616 spin_unlock(&ci->i_ceph_lock);
1617
1618 dout("__flush_snaps %p capsnap %p tid %llu %s\n",
1619 inode, capsnap, cf->tid, ceph_cap_string(capsnap->dirty));
1620
1621 ret = __send_flush_snap(inode, session, capsnap, cap->mseq,
1622 oldest_flush_tid);
1623 if (ret < 0) {
1624 pr_err("__flush_snaps: error sending cap flushsnap, "
1625 "ino (%llx.%llx) tid %llu follows %llu\n",
1626 ceph_vinop(inode), cf->tid, capsnap->follows);
1627 }
1628
1629 ceph_put_cap_snap(capsnap);
1630 spin_lock(&ci->i_ceph_lock);
1631 }
1632 }
1633
1634 void ceph_flush_snaps(struct ceph_inode_info *ci,
1635 struct ceph_mds_session **psession)
1636 {
1637 struct inode *inode = &ci->vfs_inode;
1638 struct ceph_mds_client *mdsc = ceph_inode_to_client(inode)->mdsc;
1639 struct ceph_mds_session *session = NULL;
1640 int mds;
1641
1642 dout("ceph_flush_snaps %p\n", inode);
1643 if (psession)
1644 session = *psession;
1645 retry:
1646 spin_lock(&ci->i_ceph_lock);
1647 if (!(ci->i_ceph_flags & CEPH_I_FLUSH_SNAPS)) {
1648 dout(" no capsnap needs flush, doing nothing\n");
1649 goto out;
1650 }
1651 if (!ci->i_auth_cap) {
1652 dout(" no auth cap (migrating?), doing nothing\n");
1653 goto out;
1654 }
1655
1656 mds = ci->i_auth_cap->session->s_mds;
1657 if (session && session->s_mds != mds) {
1658 dout(" oops, wrong session %p mutex\n", session);
1659 mutex_unlock(&session->s_mutex);
1660 ceph_put_mds_session(session);
1661 session = NULL;
1662 }
1663 if (!session) {
1664 spin_unlock(&ci->i_ceph_lock);
1665 mutex_lock(&mdsc->mutex);
1666 session = __ceph_lookup_mds_session(mdsc, mds);
1667 mutex_unlock(&mdsc->mutex);
1668 if (session) {
1669 dout(" inverting session/ino locks on %p\n", session);
1670 mutex_lock(&session->s_mutex);
1671 }
1672 goto retry;
1673 }
1674
1675 // make sure flushsnap messages are sent in proper order.
1676 if (ci->i_ceph_flags & CEPH_I_KICK_FLUSH)
1677 __kick_flushing_caps(mdsc, session, ci, 0);
1678
1679 __ceph_flush_snaps(ci, session);
1680 out:
1681 spin_unlock(&ci->i_ceph_lock);
1682
1683 if (psession) {
1684 *psession = session;
1685 } else if (session) {
1686 mutex_unlock(&session->s_mutex);
1687 ceph_put_mds_session(session);
1688 }
1689 /* we flushed them all; remove this inode from the queue */
1690 spin_lock(&mdsc->snap_flush_lock);
1691 list_del_init(&ci->i_snap_flush_item);
1692 spin_unlock(&mdsc->snap_flush_lock);
1693 }
1694
1695 /*
1696 * Mark caps dirty. If inode is newly dirty, return the dirty flags.
1697 * Caller is then responsible for calling __mark_inode_dirty with the
1698 * returned flags value.
1699 */
1700 int __ceph_mark_dirty_caps(struct ceph_inode_info *ci, int mask,
1701 struct ceph_cap_flush **pcf)
1702 {
1703 struct ceph_mds_client *mdsc =
1704 ceph_sb_to_client(ci->vfs_inode.i_sb)->mdsc;
1705 struct inode *inode = &ci->vfs_inode;
1706 int was = ci->i_dirty_caps;
1707 int dirty = 0;
1708
1709 lockdep_assert_held(&ci->i_ceph_lock);
1710
1711 if (!ci->i_auth_cap) {
1712 pr_warn("__mark_dirty_caps %p %llx mask %s, "
1713 "but no auth cap (session was closed?)\n",
1714 inode, ceph_ino(inode), ceph_cap_string(mask));
1715 return 0;
1716 }
1717
1718 dout("__mark_dirty_caps %p %s dirty %s -> %s\n", &ci->vfs_inode,
1719 ceph_cap_string(mask), ceph_cap_string(was),
1720 ceph_cap_string(was | mask));
1721 ci->i_dirty_caps |= mask;
1722 if (was == 0) {
1723 struct ceph_mds_session *session = ci->i_auth_cap->session;
1724
1725 WARN_ON_ONCE(ci->i_prealloc_cap_flush);
1726 swap(ci->i_prealloc_cap_flush, *pcf);
1727
1728 if (!ci->i_head_snapc) {
1729 WARN_ON_ONCE(!rwsem_is_locked(&mdsc->snap_rwsem));
1730 ci->i_head_snapc = ceph_get_snap_context(
1731 ci->i_snap_realm->cached_context);
1732 }
1733 dout(" inode %p now dirty snapc %p auth cap %p\n",
1734 &ci->vfs_inode, ci->i_head_snapc, ci->i_auth_cap);
1735 BUG_ON(!list_empty(&ci->i_dirty_item));
1736 spin_lock(&mdsc->cap_dirty_lock);
1737 list_add(&ci->i_dirty_item, &session->s_cap_dirty);
1738 spin_unlock(&mdsc->cap_dirty_lock);
1739 if (ci->i_flushing_caps == 0) {
1740 ihold(inode);
1741 dirty |= I_DIRTY_SYNC;
1742 }
1743 } else {
1744 WARN_ON_ONCE(!ci->i_prealloc_cap_flush);
1745 }
1746 BUG_ON(list_empty(&ci->i_dirty_item));
1747 if (((was | ci->i_flushing_caps) & CEPH_CAP_FILE_BUFFER) &&
1748 (mask & CEPH_CAP_FILE_BUFFER))
1749 dirty |= I_DIRTY_DATASYNC;
1750 __cap_delay_requeue(mdsc, ci);
1751 return dirty;
1752 }
1753
1754 struct ceph_cap_flush *ceph_alloc_cap_flush(void)
1755 {
1756 return kmem_cache_alloc(ceph_cap_flush_cachep, GFP_KERNEL);
1757 }
1758
1759 void ceph_free_cap_flush(struct ceph_cap_flush *cf)
1760 {
1761 if (cf)
1762 kmem_cache_free(ceph_cap_flush_cachep, cf);
1763 }
1764
1765 static u64 __get_oldest_flush_tid(struct ceph_mds_client *mdsc)
1766 {
1767 if (!list_empty(&mdsc->cap_flush_list)) {
1768 struct ceph_cap_flush *cf =
1769 list_first_entry(&mdsc->cap_flush_list,
1770 struct ceph_cap_flush, g_list);
1771 return cf->tid;
1772 }
1773 return 0;
1774 }
1775
1776 /*
1777 * Remove cap_flush from the mdsc's or inode's flushing cap list.
1778 * Return true if caller needs to wake up flush waiters.
1779 */
1780 static bool __detach_cap_flush_from_mdsc(struct ceph_mds_client *mdsc,
1781 struct ceph_cap_flush *cf)
1782 {
1783 struct ceph_cap_flush *prev;
1784 bool wake = cf->wake;
1785
1786 if (wake && cf->g_list.prev != &mdsc->cap_flush_list) {
1787 prev = list_prev_entry(cf, g_list);
1788 prev->wake = true;
1789 wake = false;
1790 }
1791 list_del(&cf->g_list);
1792 return wake;
1793 }
1794
1795 static bool __detach_cap_flush_from_ci(struct ceph_inode_info *ci,
1796 struct ceph_cap_flush *cf)
1797 {
1798 struct ceph_cap_flush *prev;
1799 bool wake = cf->wake;
1800
1801 if (wake && cf->i_list.prev != &ci->i_cap_flush_list) {
1802 prev = list_prev_entry(cf, i_list);
1803 prev->wake = true;
1804 wake = false;
1805 }
1806 list_del(&cf->i_list);
1807 return wake;
1808 }
1809
1810 /*
1811 * Add dirty inode to the flushing list. Assigned a seq number so we
1812 * can wait for caps to flush without starving.
1813 *
1814 * Called under i_ceph_lock. Returns the flush tid.
1815 */
1816 static u64 __mark_caps_flushing(struct inode *inode,
1817 struct ceph_mds_session *session, bool wake,
1818 u64 *oldest_flush_tid)
1819 {
1820 struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
1821 struct ceph_inode_info *ci = ceph_inode(inode);
1822 struct ceph_cap_flush *cf = NULL;
1823 int flushing;
1824
1825 lockdep_assert_held(&ci->i_ceph_lock);
1826 BUG_ON(ci->i_dirty_caps == 0);
1827 BUG_ON(list_empty(&ci->i_dirty_item));
1828 BUG_ON(!ci->i_prealloc_cap_flush);
1829
1830 flushing = ci->i_dirty_caps;
1831 dout("__mark_caps_flushing flushing %s, flushing_caps %s -> %s\n",
1832 ceph_cap_string(flushing),
1833 ceph_cap_string(ci->i_flushing_caps),
1834 ceph_cap_string(ci->i_flushing_caps | flushing));
1835 ci->i_flushing_caps |= flushing;
1836 ci->i_dirty_caps = 0;
1837 dout(" inode %p now !dirty\n", inode);
1838
1839 swap(cf, ci->i_prealloc_cap_flush);
1840 cf->caps = flushing;
1841 cf->wake = wake;
1842
1843 spin_lock(&mdsc->cap_dirty_lock);
1844 list_del_init(&ci->i_dirty_item);
1845
1846 cf->tid = ++mdsc->last_cap_flush_tid;
1847 list_add_tail(&cf->g_list, &mdsc->cap_flush_list);
1848 *oldest_flush_tid = __get_oldest_flush_tid(mdsc);
1849
1850 if (list_empty(&ci->i_flushing_item)) {
1851 list_add_tail(&ci->i_flushing_item, &session->s_cap_flushing);
1852 mdsc->num_cap_flushing++;
1853 }
1854 spin_unlock(&mdsc->cap_dirty_lock);
1855
1856 list_add_tail(&cf->i_list, &ci->i_cap_flush_list);
1857
1858 return cf->tid;
1859 }
1860
1861 /*
1862 * try to invalidate mapping pages without blocking.
1863 */
1864 static int try_nonblocking_invalidate(struct inode *inode)
1865 {
1866 struct ceph_inode_info *ci = ceph_inode(inode);
1867 u32 invalidating_gen = ci->i_rdcache_gen;
1868
1869 spin_unlock(&ci->i_ceph_lock);
1870 invalidate_mapping_pages(&inode->i_data, 0, -1);
1871 spin_lock(&ci->i_ceph_lock);
1872
1873 if (inode->i_data.nrpages == 0 &&
1874 invalidating_gen == ci->i_rdcache_gen) {
1875 /* success. */
1876 dout("try_nonblocking_invalidate %p success\n", inode);
1877 /* save any racing async invalidate some trouble */
1878 ci->i_rdcache_revoking = ci->i_rdcache_gen - 1;
1879 return 0;
1880 }
1881 dout("try_nonblocking_invalidate %p failed\n", inode);
1882 return -1;
1883 }
1884
1885 bool __ceph_should_report_size(struct ceph_inode_info *ci)
1886 {
1887 loff_t size = ci->vfs_inode.i_size;
1888 /* mds will adjust max size according to the reported size */
1889 if (ci->i_flushing_caps & CEPH_CAP_FILE_WR)
1890 return false;
1891 if (size >= ci->i_max_size)
1892 return true;
1893 /* half of previous max_size increment has been used */
1894 if (ci->i_max_size > ci->i_reported_size &&
1895 (size << 1) >= ci->i_max_size + ci->i_reported_size)
1896 return true;
1897 return false;
1898 }
1899
1900 /*
1901 * Swiss army knife function to examine currently used and wanted
1902 * versus held caps. Release, flush, ack revoked caps to mds as
1903 * appropriate.
1904 *
1905 * CHECK_CAPS_AUTHONLY - we should only check the auth cap
1906 * CHECK_CAPS_FLUSH - we should flush any dirty caps immediately, without
1907 * further delay.
1908 */
1909 void ceph_check_caps(struct ceph_inode_info *ci, int flags,
1910 struct ceph_mds_session *session)
1911 {
1912 struct inode *inode = &ci->vfs_inode;
1913 struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(inode->i_sb);
1914 struct ceph_cap *cap;
1915 u64 flush_tid, oldest_flush_tid;
1916 int file_wanted, used, cap_used;
1917 int took_snap_rwsem = 0; /* true if mdsc->snap_rwsem held */
1918 int issued, implemented, want, retain, revoking, flushing = 0;
1919 int mds = -1; /* keep track of how far we've gone through i_caps list
1920 to avoid an infinite loop on retry */
1921 struct rb_node *p;
1922 bool queue_invalidate = false;
1923 bool tried_invalidate = false;
1924
1925 spin_lock(&ci->i_ceph_lock);
1926 if (ci->i_ceph_flags & CEPH_I_FLUSH)
1927 flags |= CHECK_CAPS_FLUSH;
1928
1929 goto retry_locked;
1930 retry:
1931 spin_lock(&ci->i_ceph_lock);
1932 retry_locked:
1933 /* Caps wanted by virtue of active open files. */
1934 file_wanted = __ceph_caps_file_wanted(ci);
1935
1936 /* Caps which have active references against them */
1937 used = __ceph_caps_used(ci);
1938
1939 /*
1940 * "issued" represents the current caps that the MDS wants us to have.
1941 * "implemented" is the set that we have been granted, and includes the
1942 * ones that have not yet been returned to the MDS (the "revoking" set,
1943 * usually because they have outstanding references).
1944 */
1945 issued = __ceph_caps_issued(ci, &implemented);
1946 revoking = implemented & ~issued;
1947
1948 want = file_wanted;
1949
1950 /* The ones we currently want to retain (may be adjusted below) */
1951 retain = file_wanted | used | CEPH_CAP_PIN;
1952 if (!mdsc->stopping && inode->i_nlink > 0) {
1953 if (file_wanted) {
1954 retain |= CEPH_CAP_ANY; /* be greedy */
1955 } else if (S_ISDIR(inode->i_mode) &&
1956 (issued & CEPH_CAP_FILE_SHARED) &&
1957 __ceph_dir_is_complete(ci)) {
1958 /*
1959 * If a directory is complete, we want to keep
1960 * the exclusive cap. So that MDS does not end up
1961 * revoking the shared cap on every create/unlink
1962 * operation.
1963 */
1964 if (IS_RDONLY(inode)) {
1965 want = CEPH_CAP_ANY_SHARED;
1966 } else {
1967 want |= CEPH_CAP_ANY_SHARED | CEPH_CAP_FILE_EXCL;
1968 }
1969 retain |= want;
1970 } else {
1971
1972 retain |= CEPH_CAP_ANY_SHARED;
1973 /*
1974 * keep RD only if we didn't have the file open RW,
1975 * because then the mds would revoke it anyway to
1976 * journal max_size=0.
1977 */
1978 if (ci->i_max_size == 0)
1979 retain |= CEPH_CAP_ANY_RD;
1980 }
1981 }
1982
1983 dout("check_caps %p file_want %s used %s dirty %s flushing %s"
1984 " issued %s revoking %s retain %s %s%s\n", inode,
1985 ceph_cap_string(file_wanted),
1986 ceph_cap_string(used), ceph_cap_string(ci->i_dirty_caps),
1987 ceph_cap_string(ci->i_flushing_caps),
1988 ceph_cap_string(issued), ceph_cap_string(revoking),
1989 ceph_cap_string(retain),
1990 (flags & CHECK_CAPS_AUTHONLY) ? " AUTHONLY" : "",
1991 (flags & CHECK_CAPS_FLUSH) ? " FLUSH" : "");
1992
1993 /*
1994 * If we no longer need to hold onto old our caps, and we may
1995 * have cached pages, but don't want them, then try to invalidate.
1996 * If we fail, it's because pages are locked.... try again later.
1997 */
1998 if ((!(flags & CHECK_CAPS_NOINVAL) || mdsc->stopping) &&
1999 S_ISREG(inode->i_mode) &&
2000 !(ci->i_wb_ref || ci->i_wrbuffer_ref) && /* no dirty pages... */
2001 inode->i_data.nrpages && /* have cached pages */
2002 (revoking & (CEPH_CAP_FILE_CACHE|
2003 CEPH_CAP_FILE_LAZYIO)) && /* or revoking cache */
2004 !tried_invalidate) {
2005 dout("check_caps trying to invalidate on %p\n", inode);
2006 if (try_nonblocking_invalidate(inode) < 0) {
2007 dout("check_caps queuing invalidate\n");
2008 queue_invalidate = true;
2009 ci->i_rdcache_revoking = ci->i_rdcache_gen;
2010 }
2011 tried_invalidate = true;
2012 goto retry_locked;
2013 }
2014
2015 for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
2016 int mflags = 0;
2017 struct cap_msg_args arg;
2018
2019 cap = rb_entry(p, struct ceph_cap, ci_node);
2020
2021 /* avoid looping forever */
2022 if (mds >= cap->mds ||
2023 ((flags & CHECK_CAPS_AUTHONLY) && cap != ci->i_auth_cap))
2024 continue;
2025
2026 /* NOTE: no side-effects allowed, until we take s_mutex */
2027
2028 /*
2029 * If we have an auth cap, we don't need to consider any
2030 * overlapping caps as used.
2031 */
2032 cap_used = used;
2033 if (ci->i_auth_cap && cap != ci->i_auth_cap)
2034 cap_used &= ~ci->i_auth_cap->issued;
2035
2036 revoking = cap->implemented & ~cap->issued;
2037 dout(" mds%d cap %p used %s issued %s implemented %s revoking %s\n",
2038 cap->mds, cap, ceph_cap_string(cap_used),
2039 ceph_cap_string(cap->issued),
2040 ceph_cap_string(cap->implemented),
2041 ceph_cap_string(revoking));
2042
2043 if (cap == ci->i_auth_cap &&
2044 (cap->issued & CEPH_CAP_FILE_WR)) {
2045 /* request larger max_size from MDS? */
2046 if (ci->i_wanted_max_size > ci->i_max_size &&
2047 ci->i_wanted_max_size > ci->i_requested_max_size) {
2048 dout("requesting new max_size\n");
2049 goto ack;
2050 }
2051
2052 /* approaching file_max? */
2053 if (__ceph_should_report_size(ci)) {
2054 dout("i_size approaching max_size\n");
2055 goto ack;
2056 }
2057 }
2058 /* flush anything dirty? */
2059 if (cap == ci->i_auth_cap) {
2060 if ((flags & CHECK_CAPS_FLUSH) && ci->i_dirty_caps) {
2061 dout("flushing dirty caps\n");
2062 goto ack;
2063 }
2064 if (ci->i_ceph_flags & CEPH_I_FLUSH_SNAPS) {
2065 dout("flushing snap caps\n");
2066 goto ack;
2067 }
2068 }
2069
2070 /* completed revocation? going down and there are no caps? */
2071 if (revoking && (revoking & cap_used) == 0) {
2072 dout("completed revocation of %s\n",
2073 ceph_cap_string(cap->implemented & ~cap->issued));
2074 goto ack;
2075 }
2076
2077 /* want more caps from mds? */
2078 if (want & ~cap->mds_wanted) {
2079 if (want & ~(cap->mds_wanted | cap->issued))
2080 goto ack;
2081 if (!__cap_is_valid(cap))
2082 goto ack;
2083 }
2084
2085 /* things we might delay */
2086 if ((cap->issued & ~retain) == 0)
2087 continue; /* nope, all good */
2088
2089 ack:
2090 if (session && session != cap->session) {
2091 dout("oops, wrong session %p mutex\n", session);
2092 mutex_unlock(&session->s_mutex);
2093 session = NULL;
2094 }
2095 if (!session) {
2096 session = cap->session;
2097 if (mutex_trylock(&session->s_mutex) == 0) {
2098 dout("inverting session/ino locks on %p\n",
2099 session);
2100 session = ceph_get_mds_session(session);
2101 spin_unlock(&ci->i_ceph_lock);
2102 if (took_snap_rwsem) {
2103 up_read(&mdsc->snap_rwsem);
2104 took_snap_rwsem = 0;
2105 }
2106 if (session) {
2107 mutex_lock(&session->s_mutex);
2108 ceph_put_mds_session(session);
2109 } else {
2110 /*
2111 * Because we take the reference while
2112 * holding the i_ceph_lock, it should
2113 * never be NULL. Throw a warning if it
2114 * ever is.
2115 */
2116 WARN_ON_ONCE(true);
2117 }
2118 goto retry;
2119 }
2120 }
2121
2122 /* kick flushing and flush snaps before sending normal
2123 * cap message */
2124 if (cap == ci->i_auth_cap &&
2125 (ci->i_ceph_flags &
2126 (CEPH_I_KICK_FLUSH | CEPH_I_FLUSH_SNAPS))) {
2127 if (ci->i_ceph_flags & CEPH_I_KICK_FLUSH)
2128 __kick_flushing_caps(mdsc, session, ci, 0);
2129 if (ci->i_ceph_flags & CEPH_I_FLUSH_SNAPS)
2130 __ceph_flush_snaps(ci, session);
2131
2132 goto retry_locked;
2133 }
2134
2135 /* take snap_rwsem after session mutex */
2136 if (!took_snap_rwsem) {
2137 if (down_read_trylock(&mdsc->snap_rwsem) == 0) {
2138 dout("inverting snap/in locks on %p\n",
2139 inode);
2140 spin_unlock(&ci->i_ceph_lock);
2141 down_read(&mdsc->snap_rwsem);
2142 took_snap_rwsem = 1;
2143 goto retry;
2144 }
2145 took_snap_rwsem = 1;
2146 }
2147
2148 if (cap == ci->i_auth_cap && ci->i_dirty_caps) {
2149 flushing = ci->i_dirty_caps;
2150 flush_tid = __mark_caps_flushing(inode, session, false,
2151 &oldest_flush_tid);
2152 if (flags & CHECK_CAPS_FLUSH &&
2153 list_empty(&session->s_cap_dirty))
2154 mflags |= CEPH_CLIENT_CAPS_SYNC;
2155 } else {
2156 flushing = 0;
2157 flush_tid = 0;
2158 spin_lock(&mdsc->cap_dirty_lock);
2159 oldest_flush_tid = __get_oldest_flush_tid(mdsc);
2160 spin_unlock(&mdsc->cap_dirty_lock);
2161 }
2162
2163 mds = cap->mds; /* remember mds, so we don't repeat */
2164
2165 __prep_cap(&arg, cap, CEPH_CAP_OP_UPDATE, mflags, cap_used,
2166 want, retain, flushing, flush_tid, oldest_flush_tid);
2167 spin_unlock(&ci->i_ceph_lock);
2168
2169 __send_cap(&arg, ci);
2170
2171 goto retry; /* retake i_ceph_lock and restart our cap scan. */
2172 }
2173
2174 /* periodically re-calculate caps wanted by open files */
2175 if (__ceph_is_any_real_caps(ci) &&
2176 list_empty(&ci->i_cap_delay_list) &&
2177 (file_wanted & ~CEPH_CAP_PIN) &&
2178 !(used & (CEPH_CAP_FILE_RD | CEPH_CAP_ANY_FILE_WR))) {
2179 __cap_delay_requeue(mdsc, ci);
2180 }
2181
2182 spin_unlock(&ci->i_ceph_lock);
2183
2184 if (queue_invalidate)
2185 ceph_queue_invalidate(inode);
2186
2187 if (session)
2188 mutex_unlock(&session->s_mutex);
2189 if (took_snap_rwsem)
2190 up_read(&mdsc->snap_rwsem);
2191 }
2192
2193 /*
2194 * Try to flush dirty caps back to the auth mds.
2195 */
2196 static int try_flush_caps(struct inode *inode, u64 *ptid)
2197 {
2198 struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
2199 struct ceph_inode_info *ci = ceph_inode(inode);
2200 struct ceph_mds_session *session = NULL;
2201 int flushing = 0;
2202 u64 flush_tid = 0, oldest_flush_tid = 0;
2203
2204 retry:
2205 spin_lock(&ci->i_ceph_lock);
2206 retry_locked:
2207 if (ci->i_dirty_caps && ci->i_auth_cap) {
2208 struct ceph_cap *cap = ci->i_auth_cap;
2209 struct cap_msg_args arg;
2210
2211 if (session != cap->session) {
2212 spin_unlock(&ci->i_ceph_lock);
2213 if (session)
2214 mutex_unlock(&session->s_mutex);
2215 session = cap->session;
2216 mutex_lock(&session->s_mutex);
2217 goto retry;
2218 }
2219 if (cap->session->s_state < CEPH_MDS_SESSION_OPEN) {
2220 spin_unlock(&ci->i_ceph_lock);
2221 goto out;
2222 }
2223
2224 if (ci->i_ceph_flags &
2225 (CEPH_I_KICK_FLUSH | CEPH_I_FLUSH_SNAPS)) {
2226 if (ci->i_ceph_flags & CEPH_I_KICK_FLUSH)
2227 __kick_flushing_caps(mdsc, session, ci, 0);
2228 if (ci->i_ceph_flags & CEPH_I_FLUSH_SNAPS)
2229 __ceph_flush_snaps(ci, session);
2230 goto retry_locked;
2231 }
2232
2233 flushing = ci->i_dirty_caps;
2234 flush_tid = __mark_caps_flushing(inode, session, true,
2235 &oldest_flush_tid);
2236
2237 __prep_cap(&arg, cap, CEPH_CAP_OP_FLUSH, CEPH_CLIENT_CAPS_SYNC,
2238 __ceph_caps_used(ci), __ceph_caps_wanted(ci),
2239 (cap->issued | cap->implemented),
2240 flushing, flush_tid, oldest_flush_tid);
2241 spin_unlock(&ci->i_ceph_lock);
2242
2243 __send_cap(&arg, ci);
2244 } else {
2245 if (!list_empty(&ci->i_cap_flush_list)) {
2246 struct ceph_cap_flush *cf =
2247 list_last_entry(&ci->i_cap_flush_list,
2248 struct ceph_cap_flush, i_list);
2249 cf->wake = true;
2250 flush_tid = cf->tid;
2251 }
2252 flushing = ci->i_flushing_caps;
2253 spin_unlock(&ci->i_ceph_lock);
2254 }
2255 out:
2256 if (session)
2257 mutex_unlock(&session->s_mutex);
2258
2259 *ptid = flush_tid;
2260 return flushing;
2261 }
2262
2263 /*
2264 * Return true if we've flushed caps through the given flush_tid.
2265 */
2266 static int caps_are_flushed(struct inode *inode, u64 flush_tid)
2267 {
2268 struct ceph_inode_info *ci = ceph_inode(inode);
2269 int ret = 1;
2270
2271 spin_lock(&ci->i_ceph_lock);
2272 if (!list_empty(&ci->i_cap_flush_list)) {
2273 struct ceph_cap_flush * cf =
2274 list_first_entry(&ci->i_cap_flush_list,
2275 struct ceph_cap_flush, i_list);
2276 if (cf->tid <= flush_tid)
2277 ret = 0;
2278 }
2279 spin_unlock(&ci->i_ceph_lock);
2280 return ret;
2281 }
2282
2283 /*
2284 * wait for any unsafe requests to complete.
2285 */
2286 static int unsafe_request_wait(struct inode *inode)
2287 {
2288 struct ceph_inode_info *ci = ceph_inode(inode);
2289 struct ceph_mds_request *req1 = NULL, *req2 = NULL;
2290 int ret, err = 0;
2291
2292 spin_lock(&ci->i_unsafe_lock);
2293 if (S_ISDIR(inode->i_mode) && !list_empty(&ci->i_unsafe_dirops)) {
2294 req1 = list_last_entry(&ci->i_unsafe_dirops,
2295 struct ceph_mds_request,
2296 r_unsafe_dir_item);
2297 ceph_mdsc_get_request(req1);
2298 }
2299 if (!list_empty(&ci->i_unsafe_iops)) {
2300 req2 = list_last_entry(&ci->i_unsafe_iops,
2301 struct ceph_mds_request,
2302 r_unsafe_target_item);
2303 ceph_mdsc_get_request(req2);
2304 }
2305 spin_unlock(&ci->i_unsafe_lock);
2306
2307 dout("unsafe_request_wait %p wait on tid %llu %llu\n",
2308 inode, req1 ? req1->r_tid : 0ULL, req2 ? req2->r_tid : 0ULL);
2309 if (req1) {
2310 ret = !wait_for_completion_timeout(&req1->r_safe_completion,
2311 ceph_timeout_jiffies(req1->r_timeout));
2312 if (ret)
2313 err = -EIO;
2314 ceph_mdsc_put_request(req1);
2315 }
2316 if (req2) {
2317 ret = !wait_for_completion_timeout(&req2->r_safe_completion,
2318 ceph_timeout_jiffies(req2->r_timeout));
2319 if (ret)
2320 err = -EIO;
2321 ceph_mdsc_put_request(req2);
2322 }
2323 return err;
2324 }
2325
2326 int ceph_fsync(struct file *file, loff_t start, loff_t end, int datasync)
2327 {
2328 struct ceph_file_info *fi = file->private_data;
2329 struct inode *inode = file->f_mapping->host;
2330 struct ceph_inode_info *ci = ceph_inode(inode);
2331 u64 flush_tid;
2332 int ret, err;
2333 int dirty;
2334
2335 dout("fsync %p%s\n", inode, datasync ? " datasync" : "");
2336
2337 ret = file_write_and_wait_range(file, start, end);
2338 if (datasync)
2339 goto out;
2340
2341 ret = ceph_wait_on_async_create(inode);
2342 if (ret)
2343 goto out;
2344
2345 dirty = try_flush_caps(inode, &flush_tid);
2346 dout("fsync dirty caps are %s\n", ceph_cap_string(dirty));
2347
2348 err = unsafe_request_wait(inode);
2349
2350 /*
2351 * only wait on non-file metadata writeback (the mds
2352 * can recover size and mtime, so we don't need to
2353 * wait for that)
2354 */
2355 if (!err && (dirty & ~CEPH_CAP_ANY_FILE_WR)) {
2356 err = wait_event_interruptible(ci->i_cap_wq,
2357 caps_are_flushed(inode, flush_tid));
2358 }
2359
2360 if (err < 0)
2361 ret = err;
2362
2363 if (errseq_check(&ci->i_meta_err, READ_ONCE(fi->meta_err))) {
2364 spin_lock(&file->f_lock);
2365 err = errseq_check_and_advance(&ci->i_meta_err,
2366 &fi->meta_err);
2367 spin_unlock(&file->f_lock);
2368 if (err < 0)
2369 ret = err;
2370 }
2371 out:
2372 dout("fsync %p%s result=%d\n", inode, datasync ? " datasync" : "", ret);
2373 return ret;
2374 }
2375
2376 /*
2377 * Flush any dirty caps back to the mds. If we aren't asked to wait,
2378 * queue inode for flush but don't do so immediately, because we can
2379 * get by with fewer MDS messages if we wait for data writeback to
2380 * complete first.
2381 */
2382 int ceph_write_inode(struct inode *inode, struct writeback_control *wbc)
2383 {
2384 struct ceph_inode_info *ci = ceph_inode(inode);
2385 u64 flush_tid;
2386 int err = 0;
2387 int dirty;
2388 int wait = (wbc->sync_mode == WB_SYNC_ALL && !wbc->for_sync);
2389
2390 dout("write_inode %p wait=%d\n", inode, wait);
2391 if (wait) {
2392 dirty = try_flush_caps(inode, &flush_tid);
2393 if (dirty)
2394 err = wait_event_interruptible(ci->i_cap_wq,
2395 caps_are_flushed(inode, flush_tid));
2396 } else {
2397 struct ceph_mds_client *mdsc =
2398 ceph_sb_to_client(inode->i_sb)->mdsc;
2399
2400 spin_lock(&ci->i_ceph_lock);
2401 if (__ceph_caps_dirty(ci))
2402 __cap_delay_requeue_front(mdsc, ci);
2403 spin_unlock(&ci->i_ceph_lock);
2404 }
2405 return err;
2406 }
2407
2408 static void __kick_flushing_caps(struct ceph_mds_client *mdsc,
2409 struct ceph_mds_session *session,
2410 struct ceph_inode_info *ci,
2411 u64 oldest_flush_tid)
2412 __releases(ci->i_ceph_lock)
2413 __acquires(ci->i_ceph_lock)
2414 {
2415 struct inode *inode = &ci->vfs_inode;
2416 struct ceph_cap *cap;
2417 struct ceph_cap_flush *cf;
2418 int ret;
2419 u64 first_tid = 0;
2420 u64 last_snap_flush = 0;
2421
2422 ci->i_ceph_flags &= ~CEPH_I_KICK_FLUSH;
2423
2424 list_for_each_entry_reverse(cf, &ci->i_cap_flush_list, i_list) {
2425 if (!cf->caps) {
2426 last_snap_flush = cf->tid;
2427 break;
2428 }
2429 }
2430
2431 list_for_each_entry(cf, &ci->i_cap_flush_list, i_list) {
2432 if (cf->tid < first_tid)
2433 continue;
2434
2435 cap = ci->i_auth_cap;
2436 if (!(cap && cap->session == session)) {
2437 pr_err("%p auth cap %p not mds%d ???\n",
2438 inode, cap, session->s_mds);
2439 break;
2440 }
2441
2442 first_tid = cf->tid + 1;
2443
2444 if (cf->caps) {
2445 struct cap_msg_args arg;
2446
2447 dout("kick_flushing_caps %p cap %p tid %llu %s\n",
2448 inode, cap, cf->tid, ceph_cap_string(cf->caps));
2449 __prep_cap(&arg, cap, CEPH_CAP_OP_FLUSH,
2450 (cf->tid < last_snap_flush ?
2451 CEPH_CLIENT_CAPS_PENDING_CAPSNAP : 0),
2452 __ceph_caps_used(ci),
2453 __ceph_caps_wanted(ci),
2454 (cap->issued | cap->implemented),
2455 cf->caps, cf->tid, oldest_flush_tid);
2456 spin_unlock(&ci->i_ceph_lock);
2457 __send_cap(&arg, ci);
2458 } else {
2459 struct ceph_cap_snap *capsnap =
2460 container_of(cf, struct ceph_cap_snap,
2461 cap_flush);
2462 dout("kick_flushing_caps %p capsnap %p tid %llu %s\n",
2463 inode, capsnap, cf->tid,
2464 ceph_cap_string(capsnap->dirty));
2465
2466 refcount_inc(&capsnap->nref);
2467 spin_unlock(&ci->i_ceph_lock);
2468
2469 ret = __send_flush_snap(inode, session, capsnap, cap->mseq,
2470 oldest_flush_tid);
2471 if (ret < 0) {
2472 pr_err("kick_flushing_caps: error sending "
2473 "cap flushsnap, ino (%llx.%llx) "
2474 "tid %llu follows %llu\n",
2475 ceph_vinop(inode), cf->tid,
2476 capsnap->follows);
2477 }
2478
2479 ceph_put_cap_snap(capsnap);
2480 }
2481
2482 spin_lock(&ci->i_ceph_lock);
2483 }
2484 }
2485
2486 void ceph_early_kick_flushing_caps(struct ceph_mds_client *mdsc,
2487 struct ceph_mds_session *session)
2488 {
2489 struct ceph_inode_info *ci;
2490 struct ceph_cap *cap;
2491 u64 oldest_flush_tid;
2492
2493 dout("early_kick_flushing_caps mds%d\n", session->s_mds);
2494
2495 spin_lock(&mdsc->cap_dirty_lock);
2496 oldest_flush_tid = __get_oldest_flush_tid(mdsc);
2497 spin_unlock(&mdsc->cap_dirty_lock);
2498
2499 list_for_each_entry(ci, &session->s_cap_flushing, i_flushing_item) {
2500 spin_lock(&ci->i_ceph_lock);
2501 cap = ci->i_auth_cap;
2502 if (!(cap && cap->session == session)) {
2503 pr_err("%p auth cap %p not mds%d ???\n",
2504 &ci->vfs_inode, cap, session->s_mds);
2505 spin_unlock(&ci->i_ceph_lock);
2506 continue;
2507 }
2508
2509
2510 /*
2511 * if flushing caps were revoked, we re-send the cap flush
2512 * in client reconnect stage. This guarantees MDS * processes
2513 * the cap flush message before issuing the flushing caps to
2514 * other client.
2515 */
2516 if ((cap->issued & ci->i_flushing_caps) !=
2517 ci->i_flushing_caps) {
2518 /* encode_caps_cb() also will reset these sequence
2519 * numbers. make sure sequence numbers in cap flush
2520 * message match later reconnect message */
2521 cap->seq = 0;
2522 cap->issue_seq = 0;
2523 cap->mseq = 0;
2524 __kick_flushing_caps(mdsc, session, ci,
2525 oldest_flush_tid);
2526 } else {
2527 ci->i_ceph_flags |= CEPH_I_KICK_FLUSH;
2528 }
2529
2530 spin_unlock(&ci->i_ceph_lock);
2531 }
2532 }
2533
2534 void ceph_kick_flushing_caps(struct ceph_mds_client *mdsc,
2535 struct ceph_mds_session *session)
2536 {
2537 struct ceph_inode_info *ci;
2538 struct ceph_cap *cap;
2539 u64 oldest_flush_tid;
2540
2541 lockdep_assert_held(&session->s_mutex);
2542
2543 dout("kick_flushing_caps mds%d\n", session->s_mds);
2544
2545 spin_lock(&mdsc->cap_dirty_lock);
2546 oldest_flush_tid = __get_oldest_flush_tid(mdsc);
2547 spin_unlock(&mdsc->cap_dirty_lock);
2548
2549 list_for_each_entry(ci, &session->s_cap_flushing, i_flushing_item) {
2550 spin_lock(&ci->i_ceph_lock);
2551 cap = ci->i_auth_cap;
2552 if (!(cap && cap->session == session)) {
2553 pr_err("%p auth cap %p not mds%d ???\n",
2554 &ci->vfs_inode, cap, session->s_mds);
2555 spin_unlock(&ci->i_ceph_lock);
2556 continue;
2557 }
2558 if (ci->i_ceph_flags & CEPH_I_KICK_FLUSH) {
2559 __kick_flushing_caps(mdsc, session, ci,
2560 oldest_flush_tid);
2561 }
2562 spin_unlock(&ci->i_ceph_lock);
2563 }
2564 }
2565
2566 void ceph_kick_flushing_inode_caps(struct ceph_mds_session *session,
2567 struct ceph_inode_info *ci)
2568 {
2569 struct ceph_mds_client *mdsc = session->s_mdsc;
2570 struct ceph_cap *cap = ci->i_auth_cap;
2571
2572 lockdep_assert_held(&ci->i_ceph_lock);
2573
2574 dout("%s %p flushing %s\n", __func__, &ci->vfs_inode,
2575 ceph_cap_string(ci->i_flushing_caps));
2576
2577 if (!list_empty(&ci->i_cap_flush_list)) {
2578 u64 oldest_flush_tid;
2579 spin_lock(&mdsc->cap_dirty_lock);
2580 list_move_tail(&ci->i_flushing_item,
2581 &cap->session->s_cap_flushing);
2582 oldest_flush_tid = __get_oldest_flush_tid(mdsc);
2583 spin_unlock(&mdsc->cap_dirty_lock);
2584
2585 __kick_flushing_caps(mdsc, session, ci, oldest_flush_tid);
2586 }
2587 }
2588
2589
2590 /*
2591 * Take references to capabilities we hold, so that we don't release
2592 * them to the MDS prematurely.
2593 */
2594 void ceph_take_cap_refs(struct ceph_inode_info *ci, int got,
2595 bool snap_rwsem_locked)
2596 {
2597 lockdep_assert_held(&ci->i_ceph_lock);
2598
2599 if (got & CEPH_CAP_PIN)
2600 ci->i_pin_ref++;
2601 if (got & CEPH_CAP_FILE_RD)
2602 ci->i_rd_ref++;
2603 if (got & CEPH_CAP_FILE_CACHE)
2604 ci->i_rdcache_ref++;
2605 if (got & CEPH_CAP_FILE_EXCL)
2606 ci->i_fx_ref++;
2607 if (got & CEPH_CAP_FILE_WR) {
2608 if (ci->i_wr_ref == 0 && !ci->i_head_snapc) {
2609 BUG_ON(!snap_rwsem_locked);
2610 ci->i_head_snapc = ceph_get_snap_context(
2611 ci->i_snap_realm->cached_context);
2612 }
2613 ci->i_wr_ref++;
2614 }
2615 if (got & CEPH_CAP_FILE_BUFFER) {
2616 if (ci->i_wb_ref == 0)
2617 ihold(&ci->vfs_inode);
2618 ci->i_wb_ref++;
2619 dout("%s %p wb %d -> %d (?)\n", __func__,
2620 &ci->vfs_inode, ci->i_wb_ref-1, ci->i_wb_ref);
2621 }
2622 }
2623
2624 /*
2625 * Try to grab cap references. Specify those refs we @want, and the
2626 * minimal set we @need. Also include the larger offset we are writing
2627 * to (when applicable), and check against max_size here as well.
2628 * Note that caller is responsible for ensuring max_size increases are
2629 * requested from the MDS.
2630 *
2631 * Returns 0 if caps were not able to be acquired (yet), 1 if succeed,
2632 * or a negative error code. There are 3 speical error codes:
2633 * -EAGAIN: need to sleep but non-blocking is specified
2634 * -EFBIG: ask caller to call check_max_size() and try again.
2635 * -ESTALE: ask caller to call ceph_renew_caps() and try again.
2636 */
2637 enum {
2638 /* first 8 bits are reserved for CEPH_FILE_MODE_FOO */
2639 NON_BLOCKING = (1 << 8),
2640 CHECK_FILELOCK = (1 << 9),
2641 };
2642
2643 static int try_get_cap_refs(struct inode *inode, int need, int want,
2644 loff_t endoff, int flags, int *got)
2645 {
2646 struct ceph_inode_info *ci = ceph_inode(inode);
2647 struct ceph_mds_client *mdsc = ceph_inode_to_client(inode)->mdsc;
2648 int ret = 0;
2649 int have, implemented;
2650 bool snap_rwsem_locked = false;
2651
2652 dout("get_cap_refs %p need %s want %s\n", inode,
2653 ceph_cap_string(need), ceph_cap_string(want));
2654
2655 again:
2656 spin_lock(&ci->i_ceph_lock);
2657
2658 if ((flags & CHECK_FILELOCK) &&
2659 (ci->i_ceph_flags & CEPH_I_ERROR_FILELOCK)) {
2660 dout("try_get_cap_refs %p error filelock\n", inode);
2661 ret = -EIO;
2662 goto out_unlock;
2663 }
2664
2665 /* finish pending truncate */
2666 while (ci->i_truncate_pending) {
2667 spin_unlock(&ci->i_ceph_lock);
2668 if (snap_rwsem_locked) {
2669 up_read(&mdsc->snap_rwsem);
2670 snap_rwsem_locked = false;
2671 }
2672 __ceph_do_pending_vmtruncate(inode);
2673 spin_lock(&ci->i_ceph_lock);
2674 }
2675
2676 have = __ceph_caps_issued(ci, &implemented);
2677
2678 if (have & need & CEPH_CAP_FILE_WR) {
2679 if (endoff >= 0 && endoff > (loff_t)ci->i_max_size) {
2680 dout("get_cap_refs %p endoff %llu > maxsize %llu\n",
2681 inode, endoff, ci->i_max_size);
2682 if (endoff > ci->i_requested_max_size)
2683 ret = ci->i_auth_cap ? -EFBIG : -ESTALE;
2684 goto out_unlock;
2685 }
2686 /*
2687 * If a sync write is in progress, we must wait, so that we
2688 * can get a final snapshot value for size+mtime.
2689 */
2690 if (__ceph_have_pending_cap_snap(ci)) {
2691 dout("get_cap_refs %p cap_snap_pending\n", inode);
2692 goto out_unlock;
2693 }
2694 }
2695
2696 if ((have & need) == need) {
2697 /*
2698 * Look at (implemented & ~have & not) so that we keep waiting
2699 * on transition from wanted -> needed caps. This is needed
2700 * for WRBUFFER|WR -> WR to avoid a new WR sync write from
2701 * going before a prior buffered writeback happens.
2702 */
2703 int not = want & ~(have & need);
2704 int revoking = implemented & ~have;
2705 dout("get_cap_refs %p have %s but not %s (revoking %s)\n",
2706 inode, ceph_cap_string(have), ceph_cap_string(not),
2707 ceph_cap_string(revoking));
2708 if ((revoking & not) == 0) {
2709 if (!snap_rwsem_locked &&
2710 !ci->i_head_snapc &&
2711 (need & CEPH_CAP_FILE_WR)) {
2712 if (!down_read_trylock(&mdsc->snap_rwsem)) {
2713 /*
2714 * we can not call down_read() when
2715 * task isn't in TASK_RUNNING state
2716 */
2717 if (flags & NON_BLOCKING) {
2718 ret = -EAGAIN;
2719 goto out_unlock;
2720 }
2721
2722 spin_unlock(&ci->i_ceph_lock);
2723 down_read(&mdsc->snap_rwsem);
2724 snap_rwsem_locked = true;
2725 goto again;
2726 }
2727 snap_rwsem_locked = true;
2728 }
2729 if ((have & want) == want)
2730 *got = need | want;
2731 else
2732 *got = need;
2733 if (S_ISREG(inode->i_mode) &&
2734 (need & CEPH_CAP_FILE_RD) &&
2735 !(*got & CEPH_CAP_FILE_CACHE))
2736 ceph_disable_fscache_readpage(ci);
2737 ceph_take_cap_refs(ci, *got, true);
2738 ret = 1;
2739 }
2740 } else {
2741 int session_readonly = false;
2742 int mds_wanted;
2743 if (ci->i_auth_cap &&
2744 (need & (CEPH_CAP_FILE_WR | CEPH_CAP_FILE_EXCL))) {
2745 struct ceph_mds_session *s = ci->i_auth_cap->session;
2746 spin_lock(&s->s_cap_lock);
2747 session_readonly = s->s_readonly;
2748 spin_unlock(&s->s_cap_lock);
2749 }
2750 if (session_readonly) {
2751 dout("get_cap_refs %p need %s but mds%d readonly\n",
2752 inode, ceph_cap_string(need), ci->i_auth_cap->mds);
2753 ret = -EROFS;
2754 goto out_unlock;
2755 }
2756
2757 if (READ_ONCE(mdsc->fsc->mount_state) >= CEPH_MOUNT_SHUTDOWN) {
2758 dout("get_cap_refs %p forced umount\n", inode);
2759 ret = -EIO;
2760 goto out_unlock;
2761 }
2762 mds_wanted = __ceph_caps_mds_wanted(ci, false);
2763 if (need & ~mds_wanted) {
2764 dout("get_cap_refs %p need %s > mds_wanted %s\n",
2765 inode, ceph_cap_string(need),
2766 ceph_cap_string(mds_wanted));
2767 ret = -ESTALE;
2768 goto out_unlock;
2769 }
2770
2771 dout("get_cap_refs %p have %s need %s\n", inode,
2772 ceph_cap_string(have), ceph_cap_string(need));
2773 }
2774 out_unlock:
2775
2776 __ceph_touch_fmode(ci, mdsc, flags);
2777
2778 spin_unlock(&ci->i_ceph_lock);
2779 if (snap_rwsem_locked)
2780 up_read(&mdsc->snap_rwsem);
2781
2782 if (!ret)
2783 ceph_update_cap_mis(&mdsc->metric);
2784 else if (ret == 1)
2785 ceph_update_cap_hit(&mdsc->metric);
2786
2787 dout("get_cap_refs %p ret %d got %s\n", inode,
2788 ret, ceph_cap_string(*got));
2789 return ret;
2790 }
2791
2792 /*
2793 * Check the offset we are writing up to against our current
2794 * max_size. If necessary, tell the MDS we want to write to
2795 * a larger offset.
2796 */
2797 static void check_max_size(struct inode *inode, loff_t endoff)
2798 {
2799 struct ceph_inode_info *ci = ceph_inode(inode);
2800 int check = 0;
2801
2802 /* do we need to explicitly request a larger max_size? */
2803 spin_lock(&ci->i_ceph_lock);
2804 if (endoff >= ci->i_max_size && endoff > ci->i_wanted_max_size) {
2805 dout("write %p at large endoff %llu, req max_size\n",
2806 inode, endoff);
2807 ci->i_wanted_max_size = endoff;
2808 }
2809 /* duplicate ceph_check_caps()'s logic */
2810 if (ci->i_auth_cap &&
2811 (ci->i_auth_cap->issued & CEPH_CAP_FILE_WR) &&
2812 ci->i_wanted_max_size > ci->i_max_size &&
2813 ci->i_wanted_max_size > ci->i_requested_max_size)
2814 check = 1;
2815 spin_unlock(&ci->i_ceph_lock);
2816 if (check)
2817 ceph_check_caps(ci, CHECK_CAPS_AUTHONLY, NULL);
2818 }
2819
2820 static inline int get_used_fmode(int caps)
2821 {
2822 int fmode = 0;
2823 if (caps & CEPH_CAP_FILE_RD)
2824 fmode |= CEPH_FILE_MODE_RD;
2825 if (caps & CEPH_CAP_FILE_WR)
2826 fmode |= CEPH_FILE_MODE_WR;
2827 return fmode;
2828 }
2829
2830 int ceph_try_get_caps(struct inode *inode, int need, int want,
2831 bool nonblock, int *got)
2832 {
2833 int ret, flags;
2834
2835 BUG_ON(need & ~CEPH_CAP_FILE_RD);
2836 BUG_ON(want & ~(CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO |
2837 CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_EXCL |
2838 CEPH_CAP_ANY_DIR_OPS));
2839 if (need) {
2840 ret = ceph_pool_perm_check(inode, need);
2841 if (ret < 0)
2842 return ret;
2843 }
2844
2845 flags = get_used_fmode(need | want);
2846 if (nonblock)
2847 flags |= NON_BLOCKING;
2848
2849 ret = try_get_cap_refs(inode, need, want, 0, flags, got);
2850 /* three special error codes */
2851 if (ret == -EAGAIN || ret == -EFBIG || ret == -ESTALE)
2852 ret = 0;
2853 return ret;
2854 }
2855
2856 /*
2857 * Wait for caps, and take cap references. If we can't get a WR cap
2858 * due to a small max_size, make sure we check_max_size (and possibly
2859 * ask the mds) so we don't get hung up indefinitely.
2860 */
2861 int ceph_get_caps(struct file *filp, int need, int want,
2862 loff_t endoff, int *got, struct page **pinned_page)
2863 {
2864 struct ceph_file_info *fi = filp->private_data;
2865 struct inode *inode = file_inode(filp);
2866 struct ceph_inode_info *ci = ceph_inode(inode);
2867 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
2868 int ret, _got, flags;
2869
2870 ret = ceph_pool_perm_check(inode, need);
2871 if (ret < 0)
2872 return ret;
2873
2874 if ((fi->fmode & CEPH_FILE_MODE_WR) &&
2875 fi->filp_gen != READ_ONCE(fsc->filp_gen))
2876 return -EBADF;
2877
2878 flags = get_used_fmode(need | want);
2879
2880 while (true) {
2881 flags &= CEPH_FILE_MODE_MASK;
2882 if (atomic_read(&fi->num_locks))
2883 flags |= CHECK_FILELOCK;
2884 _got = 0;
2885 ret = try_get_cap_refs(inode, need, want, endoff,
2886 flags, &_got);
2887 WARN_ON_ONCE(ret == -EAGAIN);
2888 if (!ret) {
2889 struct ceph_mds_client *mdsc = fsc->mdsc;
2890 struct cap_wait cw;
2891 DEFINE_WAIT_FUNC(wait, woken_wake_function);
2892
2893 cw.ino = ceph_ino(inode);
2894 cw.tgid = current->tgid;
2895 cw.need = need;
2896 cw.want = want;
2897
2898 spin_lock(&mdsc->caps_list_lock);
2899 list_add(&cw.list, &mdsc->cap_wait_list);
2900 spin_unlock(&mdsc->caps_list_lock);
2901
2902 /* make sure used fmode not timeout */
2903 ceph_get_fmode(ci, flags, FMODE_WAIT_BIAS);
2904 add_wait_queue(&ci->i_cap_wq, &wait);
2905
2906 flags |= NON_BLOCKING;
2907 while (!(ret = try_get_cap_refs(inode, need, want,
2908 endoff, flags, &_got))) {
2909 if (signal_pending(current)) {
2910 ret = -ERESTARTSYS;
2911 break;
2912 }
2913 wait_woken(&wait, TASK_INTERRUPTIBLE, MAX_SCHEDULE_TIMEOUT);
2914 }
2915
2916 remove_wait_queue(&ci->i_cap_wq, &wait);
2917 ceph_put_fmode(ci, flags, FMODE_WAIT_BIAS);
2918
2919 spin_lock(&mdsc->caps_list_lock);
2920 list_del(&cw.list);
2921 spin_unlock(&mdsc->caps_list_lock);
2922
2923 if (ret == -EAGAIN)
2924 continue;
2925 }
2926
2927 if ((fi->fmode & CEPH_FILE_MODE_WR) &&
2928 fi->filp_gen != READ_ONCE(fsc->filp_gen)) {
2929 if (ret >= 0 && _got)
2930 ceph_put_cap_refs(ci, _got);
2931 return -EBADF;
2932 }
2933
2934 if (ret < 0) {
2935 if (ret == -EFBIG || ret == -ESTALE) {
2936 int ret2 = ceph_wait_on_async_create(inode);
2937 if (ret2 < 0)
2938 return ret2;
2939 }
2940 if (ret == -EFBIG) {
2941 check_max_size(inode, endoff);
2942 continue;
2943 }
2944 if (ret == -ESTALE) {
2945 /* session was killed, try renew caps */
2946 ret = ceph_renew_caps(inode, flags);
2947 if (ret == 0)
2948 continue;
2949 }
2950 return ret;
2951 }
2952
2953 if (S_ISREG(ci->vfs_inode.i_mode) &&
2954 ci->i_inline_version != CEPH_INLINE_NONE &&
2955 (_got & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) &&
2956 i_size_read(inode) > 0) {
2957 struct page *page =
2958 find_get_page(inode->i_mapping, 0);
2959 if (page) {
2960 if (PageUptodate(page)) {
2961 *pinned_page = page;
2962 break;
2963 }
2964 put_page(page);
2965 }
2966 /*
2967 * drop cap refs first because getattr while
2968 * holding * caps refs can cause deadlock.
2969 */
2970 ceph_put_cap_refs(ci, _got);
2971 _got = 0;
2972
2973 /*
2974 * getattr request will bring inline data into
2975 * page cache
2976 */
2977 ret = __ceph_do_getattr(inode, NULL,
2978 CEPH_STAT_CAP_INLINE_DATA,
2979 true);
2980 if (ret < 0)
2981 return ret;
2982 continue;
2983 }
2984 break;
2985 }
2986
2987 if (S_ISREG(ci->vfs_inode.i_mode) &&
2988 (_got & CEPH_CAP_FILE_RD) && (_got & CEPH_CAP_FILE_CACHE))
2989 ceph_fscache_revalidate_cookie(ci);
2990
2991 *got = _got;
2992 return 0;
2993 }
2994
2995 /*
2996 * Take cap refs. Caller must already know we hold at least one ref
2997 * on the caps in question or we don't know this is safe.
2998 */
2999 void ceph_get_cap_refs(struct ceph_inode_info *ci, int caps)
3000 {
3001 spin_lock(&ci->i_ceph_lock);
3002 ceph_take_cap_refs(ci, caps, false);
3003 spin_unlock(&ci->i_ceph_lock);
3004 }
3005
3006
3007 /*
3008 * drop cap_snap that is not associated with any snapshot.
3009 * we don't need to send FLUSHSNAP message for it.
3010 */
3011 static int ceph_try_drop_cap_snap(struct ceph_inode_info *ci,
3012 struct ceph_cap_snap *capsnap)
3013 {
3014 if (!capsnap->need_flush &&
3015 !capsnap->writing && !capsnap->dirty_pages) {
3016 dout("dropping cap_snap %p follows %llu\n",
3017 capsnap, capsnap->follows);
3018 BUG_ON(capsnap->cap_flush.tid > 0);
3019 ceph_put_snap_context(capsnap->context);
3020 if (!list_is_last(&capsnap->ci_item, &ci->i_cap_snaps))
3021 ci->i_ceph_flags |= CEPH_I_FLUSH_SNAPS;
3022
3023 list_del(&capsnap->ci_item);
3024 ceph_put_cap_snap(capsnap);
3025 return 1;
3026 }
3027 return 0;
3028 }
3029
3030 /*
3031 * Release cap refs.
3032 *
3033 * If we released the last ref on any given cap, call ceph_check_caps
3034 * to release (or schedule a release).
3035 *
3036 * If we are releasing a WR cap (from a sync write), finalize any affected
3037 * cap_snap, and wake up any waiters.
3038 */
3039 static void __ceph_put_cap_refs(struct ceph_inode_info *ci, int had,
3040 bool skip_checking_caps)
3041 {
3042 struct inode *inode = &ci->vfs_inode;
3043 int last = 0, put = 0, flushsnaps = 0, wake = 0;
3044
3045 spin_lock(&ci->i_ceph_lock);
3046 if (had & CEPH_CAP_PIN)
3047 --ci->i_pin_ref;
3048 if (had & CEPH_CAP_FILE_RD)
3049 if (--ci->i_rd_ref == 0)
3050 last++;
3051 if (had & CEPH_CAP_FILE_CACHE)
3052 if (--ci->i_rdcache_ref == 0)
3053 last++;
3054 if (had & CEPH_CAP_FILE_EXCL)
3055 if (--ci->i_fx_ref == 0)
3056 last++;
3057 if (had & CEPH_CAP_FILE_BUFFER) {
3058 if (--ci->i_wb_ref == 0) {
3059 last++;
3060 put++;
3061 }
3062 dout("put_cap_refs %p wb %d -> %d (?)\n",
3063 inode, ci->i_wb_ref+1, ci->i_wb_ref);
3064 }
3065 if (had & CEPH_CAP_FILE_WR)
3066 if (--ci->i_wr_ref == 0) {
3067 last++;
3068 if (__ceph_have_pending_cap_snap(ci)) {
3069 struct ceph_cap_snap *capsnap =
3070 list_last_entry(&ci->i_cap_snaps,
3071 struct ceph_cap_snap,
3072 ci_item);
3073 capsnap->writing = 0;
3074 if (ceph_try_drop_cap_snap(ci, capsnap))
3075 put++;
3076 else if (__ceph_finish_cap_snap(ci, capsnap))
3077 flushsnaps = 1;
3078 wake = 1;
3079 }
3080 if (ci->i_wrbuffer_ref_head == 0 &&
3081 ci->i_dirty_caps == 0 &&
3082 ci->i_flushing_caps == 0) {
3083 BUG_ON(!ci->i_head_snapc);
3084 ceph_put_snap_context(ci->i_head_snapc);
3085 ci->i_head_snapc = NULL;
3086 }
3087 /* see comment in __ceph_remove_cap() */
3088 if (!__ceph_is_any_real_caps(ci) && ci->i_snap_realm)
3089 drop_inode_snap_realm(ci);
3090 }
3091 spin_unlock(&ci->i_ceph_lock);
3092
3093 dout("put_cap_refs %p had %s%s%s\n", inode, ceph_cap_string(had),
3094 last ? " last" : "", put ? " put" : "");
3095
3096 if (last && !skip_checking_caps)
3097 ceph_check_caps(ci, 0, NULL);
3098 else if (flushsnaps)
3099 ceph_flush_snaps(ci, NULL);
3100 if (wake)
3101 wake_up_all(&ci->i_cap_wq);
3102 while (put-- > 0)
3103 iput(inode);
3104 }
3105
3106 void ceph_put_cap_refs(struct ceph_inode_info *ci, int had)
3107 {
3108 __ceph_put_cap_refs(ci, had, false);
3109 }
3110
3111 void ceph_put_cap_refs_no_check_caps(struct ceph_inode_info *ci, int had)
3112 {
3113 __ceph_put_cap_refs(ci, had, true);
3114 }
3115
3116 /*
3117 * Release @nr WRBUFFER refs on dirty pages for the given @snapc snap
3118 * context. Adjust per-snap dirty page accounting as appropriate.
3119 * Once all dirty data for a cap_snap is flushed, flush snapped file
3120 * metadata back to the MDS. If we dropped the last ref, call
3121 * ceph_check_caps.
3122 */
3123 void ceph_put_wrbuffer_cap_refs(struct ceph_inode_info *ci, int nr,
3124 struct ceph_snap_context *snapc)
3125 {
3126 struct inode *inode = &ci->vfs_inode;
3127 struct ceph_cap_snap *capsnap = NULL;
3128 int put = 0;
3129 bool last = false;
3130 bool found = false;
3131 bool flush_snaps = false;
3132 bool complete_capsnap = false;
3133
3134 spin_lock(&ci->i_ceph_lock);
3135 ci->i_wrbuffer_ref -= nr;
3136 if (ci->i_wrbuffer_ref == 0) {
3137 last = true;
3138 put++;
3139 }
3140
3141 if (ci->i_head_snapc == snapc) {
3142 ci->i_wrbuffer_ref_head -= nr;
3143 if (ci->i_wrbuffer_ref_head == 0 &&
3144 ci->i_wr_ref == 0 &&
3145 ci->i_dirty_caps == 0 &&
3146 ci->i_flushing_caps == 0) {
3147 BUG_ON(!ci->i_head_snapc);
3148 ceph_put_snap_context(ci->i_head_snapc);
3149 ci->i_head_snapc = NULL;
3150 }
3151 dout("put_wrbuffer_cap_refs on %p head %d/%d -> %d/%d %s\n",
3152 inode,
3153 ci->i_wrbuffer_ref+nr, ci->i_wrbuffer_ref_head+nr,
3154 ci->i_wrbuffer_ref, ci->i_wrbuffer_ref_head,
3155 last ? " LAST" : "");
3156 } else {
3157 list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) {
3158 if (capsnap->context == snapc) {
3159 found = true;
3160 break;
3161 }
3162 }
3163 BUG_ON(!found);
3164 capsnap->dirty_pages -= nr;
3165 if (capsnap->dirty_pages == 0) {
3166 complete_capsnap = true;
3167 if (!capsnap->writing) {
3168 if (ceph_try_drop_cap_snap(ci, capsnap)) {
3169 put++;
3170 } else {
3171 ci->i_ceph_flags |= CEPH_I_FLUSH_SNAPS;
3172 flush_snaps = true;
3173 }
3174 }
3175 }
3176 dout("put_wrbuffer_cap_refs on %p cap_snap %p "
3177 " snap %lld %d/%d -> %d/%d %s%s\n",
3178 inode, capsnap, capsnap->context->seq,
3179 ci->i_wrbuffer_ref+nr, capsnap->dirty_pages + nr,
3180 ci->i_wrbuffer_ref, capsnap->dirty_pages,
3181 last ? " (wrbuffer last)" : "",
3182 complete_capsnap ? " (complete capsnap)" : "");
3183 }
3184
3185 spin_unlock(&ci->i_ceph_lock);
3186
3187 if (last) {
3188 ceph_check_caps(ci, 0, NULL);
3189 } else if (flush_snaps) {
3190 ceph_flush_snaps(ci, NULL);
3191 }
3192 if (complete_capsnap)
3193 wake_up_all(&ci->i_cap_wq);
3194 while (put-- > 0) {
3195 /* avoid calling iput_final() in osd dispatch threads */
3196 ceph_async_iput(inode);
3197 }
3198 }
3199
3200 /*
3201 * Invalidate unlinked inode's aliases, so we can drop the inode ASAP.
3202 */
3203 static void invalidate_aliases(struct inode *inode)
3204 {
3205 struct dentry *dn, *prev = NULL;
3206
3207 dout("invalidate_aliases inode %p\n", inode);
3208 d_prune_aliases(inode);
3209 /*
3210 * For non-directory inode, d_find_alias() only returns
3211 * hashed dentry. After calling d_invalidate(), the
3212 * dentry becomes unhashed.
3213 *
3214 * For directory inode, d_find_alias() can return
3215 * unhashed dentry. But directory inode should have
3216 * one alias at most.
3217 */
3218 while ((dn = d_find_alias(inode))) {
3219 if (dn == prev) {
3220 dput(dn);
3221 break;
3222 }
3223 d_invalidate(dn);
3224 if (prev)
3225 dput(prev);
3226 prev = dn;
3227 }
3228 if (prev)
3229 dput(prev);
3230 }
3231
3232 struct cap_extra_info {
3233 struct ceph_string *pool_ns;
3234 /* inline data */
3235 u64 inline_version;
3236 void *inline_data;
3237 u32 inline_len;
3238 /* dirstat */
3239 bool dirstat_valid;
3240 u64 nfiles;
3241 u64 nsubdirs;
3242 u64 change_attr;
3243 /* currently issued */
3244 int issued;
3245 struct timespec64 btime;
3246 };
3247
3248 /*
3249 * Handle a cap GRANT message from the MDS. (Note that a GRANT may
3250 * actually be a revocation if it specifies a smaller cap set.)
3251 *
3252 * caller holds s_mutex and i_ceph_lock, we drop both.
3253 */
3254 static void handle_cap_grant(struct inode *inode,
3255 struct ceph_mds_session *session,
3256 struct ceph_cap *cap,
3257 struct ceph_mds_caps *grant,
3258 struct ceph_buffer *xattr_buf,
3259 struct cap_extra_info *extra_info)
3260 __releases(ci->i_ceph_lock)
3261 __releases(session->s_mdsc->snap_rwsem)
3262 {
3263 struct ceph_inode_info *ci = ceph_inode(inode);
3264 int seq = le32_to_cpu(grant->seq);
3265 int newcaps = le32_to_cpu(grant->caps);
3266 int used, wanted, dirty;
3267 u64 size = le64_to_cpu(grant->size);
3268 u64 max_size = le64_to_cpu(grant->max_size);
3269 unsigned char check_caps = 0;
3270 bool was_stale = cap->cap_gen < session->s_cap_gen;
3271 bool wake = false;
3272 bool writeback = false;
3273 bool queue_trunc = false;
3274 bool queue_invalidate = false;
3275 bool deleted_inode = false;
3276 bool fill_inline = false;
3277
3278 dout("handle_cap_grant inode %p cap %p mds%d seq %d %s\n",
3279 inode, cap, session->s_mds, seq, ceph_cap_string(newcaps));
3280 dout(" size %llu max_size %llu, i_size %llu\n", size, max_size,
3281 inode->i_size);
3282
3283
3284 /*
3285 * If CACHE is being revoked, and we have no dirty buffers,
3286 * try to invalidate (once). (If there are dirty buffers, we
3287 * will invalidate _after_ writeback.)
3288 */
3289 if (S_ISREG(inode->i_mode) && /* don't invalidate readdir cache */
3290 ((cap->issued & ~newcaps) & CEPH_CAP_FILE_CACHE) &&
3291 (newcaps & CEPH_CAP_FILE_LAZYIO) == 0 &&
3292 !(ci->i_wrbuffer_ref || ci->i_wb_ref)) {
3293 if (try_nonblocking_invalidate(inode)) {
3294 /* there were locked pages.. invalidate later
3295 in a separate thread. */
3296 if (ci->i_rdcache_revoking != ci->i_rdcache_gen) {
3297 queue_invalidate = true;
3298 ci->i_rdcache_revoking = ci->i_rdcache_gen;
3299 }
3300 }
3301 }
3302
3303 if (was_stale)
3304 cap->issued = cap->implemented = CEPH_CAP_PIN;
3305
3306 /*
3307 * auth mds of the inode changed. we received the cap export message,
3308 * but still haven't received the cap import message. handle_cap_export
3309 * updated the new auth MDS' cap.
3310 *
3311 * "ceph_seq_cmp(seq, cap->seq) <= 0" means we are processing a message
3312 * that was sent before the cap import message. So don't remove caps.
3313 */
3314 if (ceph_seq_cmp(seq, cap->seq) <= 0) {
3315 WARN_ON(cap != ci->i_auth_cap);
3316 WARN_ON(cap->cap_id != le64_to_cpu(grant->cap_id));
3317 seq = cap->seq;
3318 newcaps |= cap->issued;
3319 }
3320
3321 /* side effects now are allowed */
3322 cap->cap_gen = session->s_cap_gen;
3323 cap->seq = seq;
3324
3325 __check_cap_issue(ci, cap, newcaps);
3326
3327 inode_set_max_iversion_raw(inode, extra_info->change_attr);
3328
3329 if ((newcaps & CEPH_CAP_AUTH_SHARED) &&
3330 (extra_info->issued & CEPH_CAP_AUTH_EXCL) == 0) {
3331 inode->i_mode = le32_to_cpu(grant->mode);
3332 inode->i_uid = make_kuid(&init_user_ns, le32_to_cpu(grant->uid));
3333 inode->i_gid = make_kgid(&init_user_ns, le32_to_cpu(grant->gid));
3334 ci->i_btime = extra_info->btime;
3335 dout("%p mode 0%o uid.gid %d.%d\n", inode, inode->i_mode,
3336 from_kuid(&init_user_ns, inode->i_uid),
3337 from_kgid(&init_user_ns, inode->i_gid));
3338 }
3339
3340 if ((newcaps & CEPH_CAP_LINK_SHARED) &&
3341 (extra_info->issued & CEPH_CAP_LINK_EXCL) == 0) {
3342 set_nlink(inode, le32_to_cpu(grant->nlink));
3343 if (inode->i_nlink == 0 &&
3344 (newcaps & (CEPH_CAP_LINK_SHARED | CEPH_CAP_LINK_EXCL)))
3345 deleted_inode = true;
3346 }
3347
3348 if ((extra_info->issued & CEPH_CAP_XATTR_EXCL) == 0 &&
3349 grant->xattr_len) {
3350 int len = le32_to_cpu(grant->xattr_len);
3351 u64 version = le64_to_cpu(grant->xattr_version);
3352
3353 if (version > ci->i_xattrs.version) {
3354 dout(" got new xattrs v%llu on %p len %d\n",
3355 version, inode, len);
3356 if (ci->i_xattrs.blob)
3357 ceph_buffer_put(ci->i_xattrs.blob);
3358 ci->i_xattrs.blob = ceph_buffer_get(xattr_buf);
3359 ci->i_xattrs.version = version;
3360 ceph_forget_all_cached_acls(inode);
3361 ceph_security_invalidate_secctx(inode);
3362 }
3363 }
3364
3365 if (newcaps & CEPH_CAP_ANY_RD) {
3366 struct timespec64 mtime, atime, ctime;
3367 /* ctime/mtime/atime? */
3368 ceph_decode_timespec64(&mtime, &grant->mtime);
3369 ceph_decode_timespec64(&atime, &grant->atime);
3370 ceph_decode_timespec64(&ctime, &grant->ctime);
3371 ceph_fill_file_time(inode, extra_info->issued,
3372 le32_to_cpu(grant->time_warp_seq),
3373 &ctime, &mtime, &atime);
3374 }
3375
3376 if ((newcaps & CEPH_CAP_FILE_SHARED) && extra_info->dirstat_valid) {
3377 ci->i_files = extra_info->nfiles;
3378 ci->i_subdirs = extra_info->nsubdirs;
3379 }
3380
3381 if (newcaps & (CEPH_CAP_ANY_FILE_RD | CEPH_CAP_ANY_FILE_WR)) {
3382 /* file layout may have changed */
3383 s64 old_pool = ci->i_layout.pool_id;
3384 struct ceph_string *old_ns;
3385
3386 ceph_file_layout_from_legacy(&ci->i_layout, &grant->layout);
3387 old_ns = rcu_dereference_protected(ci->i_layout.pool_ns,
3388 lockdep_is_held(&ci->i_ceph_lock));
3389 rcu_assign_pointer(ci->i_layout.pool_ns, extra_info->pool_ns);
3390
3391 if (ci->i_layout.pool_id != old_pool ||
3392 extra_info->pool_ns != old_ns)
3393 ci->i_ceph_flags &= ~CEPH_I_POOL_PERM;
3394
3395 extra_info->pool_ns = old_ns;
3396
3397 /* size/truncate_seq? */
3398 queue_trunc = ceph_fill_file_size(inode, extra_info->issued,
3399 le32_to_cpu(grant->truncate_seq),
3400 le64_to_cpu(grant->truncate_size),
3401 size);
3402 }
3403
3404 if (ci->i_auth_cap == cap && (newcaps & CEPH_CAP_ANY_FILE_WR)) {
3405 if (max_size != ci->i_max_size) {
3406 dout("max_size %lld -> %llu\n",
3407 ci->i_max_size, max_size);
3408 ci->i_max_size = max_size;
3409 if (max_size >= ci->i_wanted_max_size) {
3410 ci->i_wanted_max_size = 0; /* reset */
3411 ci->i_requested_max_size = 0;
3412 }
3413 wake = true;
3414 }
3415 }
3416
3417 /* check cap bits */
3418 wanted = __ceph_caps_wanted(ci);
3419 used = __ceph_caps_used(ci);
3420 dirty = __ceph_caps_dirty(ci);
3421 dout(" my wanted = %s, used = %s, dirty %s\n",
3422 ceph_cap_string(wanted),
3423 ceph_cap_string(used),
3424 ceph_cap_string(dirty));
3425
3426 if ((was_stale || le32_to_cpu(grant->op) == CEPH_CAP_OP_IMPORT) &&
3427 (wanted & ~(cap->mds_wanted | newcaps))) {
3428 /*
3429 * If mds is importing cap, prior cap messages that update
3430 * 'wanted' may get dropped by mds (migrate seq mismatch).
3431 *
3432 * We don't send cap message to update 'wanted' if what we
3433 * want are already issued. If mds revokes caps, cap message
3434 * that releases caps also tells mds what we want. But if
3435 * caps got revoked by mds forcedly (session stale). We may
3436 * haven't told mds what we want.
3437 */
3438 check_caps = 1;
3439 }
3440
3441 /* revocation, grant, or no-op? */
3442 if (cap->issued & ~newcaps) {
3443 int revoking = cap->issued & ~newcaps;
3444
3445 dout("revocation: %s -> %s (revoking %s)\n",
3446 ceph_cap_string(cap->issued),
3447 ceph_cap_string(newcaps),
3448 ceph_cap_string(revoking));
3449 if (S_ISREG(inode->i_mode) &&
3450 (revoking & used & CEPH_CAP_FILE_BUFFER))
3451 writeback = true; /* initiate writeback; will delay ack */
3452 else if (queue_invalidate &&
3453 revoking == CEPH_CAP_FILE_CACHE &&
3454 (newcaps & CEPH_CAP_FILE_LAZYIO) == 0)
3455 ; /* do nothing yet, invalidation will be queued */
3456 else if (cap == ci->i_auth_cap)
3457 check_caps = 1; /* check auth cap only */
3458 else
3459 check_caps = 2; /* check all caps */
3460 cap->issued = newcaps;
3461 cap->implemented |= newcaps;
3462 } else if (cap->issued == newcaps) {
3463 dout("caps unchanged: %s -> %s\n",
3464 ceph_cap_string(cap->issued), ceph_cap_string(newcaps));
3465 } else {
3466 dout("grant: %s -> %s\n", ceph_cap_string(cap->issued),
3467 ceph_cap_string(newcaps));
3468 /* non-auth MDS is revoking the newly grant caps ? */
3469 if (cap == ci->i_auth_cap &&
3470 __ceph_caps_revoking_other(ci, cap, newcaps))
3471 check_caps = 2;
3472
3473 cap->issued = newcaps;
3474 cap->implemented |= newcaps; /* add bits only, to
3475 * avoid stepping on a
3476 * pending revocation */
3477 wake = true;
3478 }
3479 BUG_ON(cap->issued & ~cap->implemented);
3480
3481 if (extra_info->inline_version > 0 &&
3482 extra_info->inline_version >= ci->i_inline_version) {
3483 ci->i_inline_version = extra_info->inline_version;
3484 if (ci->i_inline_version != CEPH_INLINE_NONE &&
3485 (newcaps & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)))
3486 fill_inline = true;
3487 }
3488
3489 if (ci->i_auth_cap == cap &&
3490 le32_to_cpu(grant->op) == CEPH_CAP_OP_IMPORT) {
3491 if (newcaps & ~extra_info->issued)
3492 wake = true;
3493
3494 if (ci->i_requested_max_size > max_size ||
3495 !(le32_to_cpu(grant->wanted) & CEPH_CAP_ANY_FILE_WR)) {
3496 /* re-request max_size if necessary */
3497 ci->i_requested_max_size = 0;
3498 wake = true;
3499 }
3500
3501 ceph_kick_flushing_inode_caps(session, ci);
3502 spin_unlock(&ci->i_ceph_lock);
3503 up_read(&session->s_mdsc->snap_rwsem);
3504 } else {
3505 spin_unlock(&ci->i_ceph_lock);
3506 }
3507
3508 if (fill_inline)
3509 ceph_fill_inline_data(inode, NULL, extra_info->inline_data,
3510 extra_info->inline_len);
3511
3512 if (queue_trunc)
3513 ceph_queue_vmtruncate(inode);
3514
3515 if (writeback)
3516 /*
3517 * queue inode for writeback: we can't actually call
3518 * filemap_write_and_wait, etc. from message handler
3519 * context.
3520 */
3521 ceph_queue_writeback(inode);
3522 if (queue_invalidate)
3523 ceph_queue_invalidate(inode);
3524 if (deleted_inode)
3525 invalidate_aliases(inode);
3526 if (wake)
3527 wake_up_all(&ci->i_cap_wq);
3528
3529 if (check_caps == 1)
3530 ceph_check_caps(ci, CHECK_CAPS_AUTHONLY | CHECK_CAPS_NOINVAL,
3531 session);
3532 else if (check_caps == 2)
3533 ceph_check_caps(ci, CHECK_CAPS_NOINVAL, session);
3534 else
3535 mutex_unlock(&session->s_mutex);
3536 }
3537
3538 /*
3539 * Handle FLUSH_ACK from MDS, indicating that metadata we sent to the
3540 * MDS has been safely committed.
3541 */
3542 static void handle_cap_flush_ack(struct inode *inode, u64 flush_tid,
3543 struct ceph_mds_caps *m,
3544 struct ceph_mds_session *session,
3545 struct ceph_cap *cap)
3546 __releases(ci->i_ceph_lock)
3547 {
3548 struct ceph_inode_info *ci = ceph_inode(inode);
3549 struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
3550 struct ceph_cap_flush *cf, *tmp_cf;
3551 LIST_HEAD(to_remove);
3552 unsigned seq = le32_to_cpu(m->seq);
3553 int dirty = le32_to_cpu(m->dirty);
3554 int cleaned = 0;
3555 bool drop = false;
3556 bool wake_ci = false;
3557 bool wake_mdsc = false;
3558
3559 list_for_each_entry_safe(cf, tmp_cf, &ci->i_cap_flush_list, i_list) {
3560 /* Is this the one that was flushed? */
3561 if (cf->tid == flush_tid)
3562 cleaned = cf->caps;
3563
3564 /* Is this a capsnap? */
3565 if (cf->caps == 0)
3566 continue;
3567
3568 if (cf->tid <= flush_tid) {
3569 /*
3570 * An earlier or current tid. The FLUSH_ACK should
3571 * represent a superset of this flush's caps.
3572 */
3573 wake_ci |= __detach_cap_flush_from_ci(ci, cf);
3574 list_add_tail(&cf->i_list, &to_remove);
3575 } else {
3576 /*
3577 * This is a later one. Any caps in it are still dirty
3578 * so don't count them as cleaned.
3579 */
3580 cleaned &= ~cf->caps;
3581 if (!cleaned)
3582 break;
3583 }
3584 }
3585
3586 dout("handle_cap_flush_ack inode %p mds%d seq %d on %s cleaned %s,"
3587 " flushing %s -> %s\n",
3588 inode, session->s_mds, seq, ceph_cap_string(dirty),
3589 ceph_cap_string(cleaned), ceph_cap_string(ci->i_flushing_caps),
3590 ceph_cap_string(ci->i_flushing_caps & ~cleaned));
3591
3592 if (list_empty(&to_remove) && !cleaned)
3593 goto out;
3594
3595 ci->i_flushing_caps &= ~cleaned;
3596
3597 spin_lock(&mdsc->cap_dirty_lock);
3598
3599 list_for_each_entry(cf, &to_remove, i_list)
3600 wake_mdsc |= __detach_cap_flush_from_mdsc(mdsc, cf);
3601
3602 if (ci->i_flushing_caps == 0) {
3603 if (list_empty(&ci->i_cap_flush_list)) {
3604 list_del_init(&ci->i_flushing_item);
3605 if (!list_empty(&session->s_cap_flushing)) {
3606 dout(" mds%d still flushing cap on %p\n",
3607 session->s_mds,
3608 &list_first_entry(&session->s_cap_flushing,
3609 struct ceph_inode_info,
3610 i_flushing_item)->vfs_inode);
3611 }
3612 }
3613 mdsc->num_cap_flushing--;
3614 dout(" inode %p now !flushing\n", inode);
3615
3616 if (ci->i_dirty_caps == 0) {
3617 dout(" inode %p now clean\n", inode);
3618 BUG_ON(!list_empty(&ci->i_dirty_item));
3619 drop = true;
3620 if (ci->i_wr_ref == 0 &&
3621 ci->i_wrbuffer_ref_head == 0) {
3622 BUG_ON(!ci->i_head_snapc);
3623 ceph_put_snap_context(ci->i_head_snapc);
3624 ci->i_head_snapc = NULL;
3625 }
3626 } else {
3627 BUG_ON(list_empty(&ci->i_dirty_item));
3628 }
3629 }
3630 spin_unlock(&mdsc->cap_dirty_lock);
3631
3632 out:
3633 spin_unlock(&ci->i_ceph_lock);
3634
3635 while (!list_empty(&to_remove)) {
3636 cf = list_first_entry(&to_remove,
3637 struct ceph_cap_flush, i_list);
3638 list_del(&cf->i_list);
3639 ceph_free_cap_flush(cf);
3640 }
3641
3642 if (wake_ci)
3643 wake_up_all(&ci->i_cap_wq);
3644 if (wake_mdsc)
3645 wake_up_all(&mdsc->cap_flushing_wq);
3646 if (drop)
3647 iput(inode);
3648 }
3649
3650 /*
3651 * Handle FLUSHSNAP_ACK. MDS has flushed snap data to disk and we can
3652 * throw away our cap_snap.
3653 *
3654 * Caller hold s_mutex.
3655 */
3656 static void handle_cap_flushsnap_ack(struct inode *inode, u64 flush_tid,
3657 struct ceph_mds_caps *m,
3658 struct ceph_mds_session *session)
3659 {
3660 struct ceph_inode_info *ci = ceph_inode(inode);
3661 struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
3662 u64 follows = le64_to_cpu(m->snap_follows);
3663 struct ceph_cap_snap *capsnap;
3664 bool flushed = false;
3665 bool wake_ci = false;
3666 bool wake_mdsc = false;
3667
3668 dout("handle_cap_flushsnap_ack inode %p ci %p mds%d follows %lld\n",
3669 inode, ci, session->s_mds, follows);
3670
3671 spin_lock(&ci->i_ceph_lock);
3672 list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) {
3673 if (capsnap->follows == follows) {
3674 if (capsnap->cap_flush.tid != flush_tid) {
3675 dout(" cap_snap %p follows %lld tid %lld !="
3676 " %lld\n", capsnap, follows,
3677 flush_tid, capsnap->cap_flush.tid);
3678 break;
3679 }
3680 flushed = true;
3681 break;
3682 } else {
3683 dout(" skipping cap_snap %p follows %lld\n",
3684 capsnap, capsnap->follows);
3685 }
3686 }
3687 if (flushed) {
3688 WARN_ON(capsnap->dirty_pages || capsnap->writing);
3689 dout(" removing %p cap_snap %p follows %lld\n",
3690 inode, capsnap, follows);
3691 list_del(&capsnap->ci_item);
3692 wake_ci |= __detach_cap_flush_from_ci(ci, &capsnap->cap_flush);
3693
3694 spin_lock(&mdsc->cap_dirty_lock);
3695
3696 if (list_empty(&ci->i_cap_flush_list))
3697 list_del_init(&ci->i_flushing_item);
3698
3699 wake_mdsc |= __detach_cap_flush_from_mdsc(mdsc,
3700 &capsnap->cap_flush);
3701 spin_unlock(&mdsc->cap_dirty_lock);
3702 }
3703 spin_unlock(&ci->i_ceph_lock);
3704 if (flushed) {
3705 ceph_put_snap_context(capsnap->context);
3706 ceph_put_cap_snap(capsnap);
3707 if (wake_ci)
3708 wake_up_all(&ci->i_cap_wq);
3709 if (wake_mdsc)
3710 wake_up_all(&mdsc->cap_flushing_wq);
3711 iput(inode);
3712 }
3713 }
3714
3715 /*
3716 * Handle TRUNC from MDS, indicating file truncation.
3717 *
3718 * caller hold s_mutex.
3719 */
3720 static bool handle_cap_trunc(struct inode *inode,
3721 struct ceph_mds_caps *trunc,
3722 struct ceph_mds_session *session)
3723 {
3724 struct ceph_inode_info *ci = ceph_inode(inode);
3725 int mds = session->s_mds;
3726 int seq = le32_to_cpu(trunc->seq);
3727 u32 truncate_seq = le32_to_cpu(trunc->truncate_seq);
3728 u64 truncate_size = le64_to_cpu(trunc->truncate_size);
3729 u64 size = le64_to_cpu(trunc->size);
3730 int implemented = 0;
3731 int dirty = __ceph_caps_dirty(ci);
3732 int issued = __ceph_caps_issued(ceph_inode(inode), &implemented);
3733 bool queue_trunc = false;
3734
3735 lockdep_assert_held(&ci->i_ceph_lock);
3736
3737 issued |= implemented | dirty;
3738
3739 dout("handle_cap_trunc inode %p mds%d seq %d to %lld seq %d\n",
3740 inode, mds, seq, truncate_size, truncate_seq);
3741 queue_trunc = ceph_fill_file_size(inode, issued,
3742 truncate_seq, truncate_size, size);
3743 return queue_trunc;
3744 }
3745
3746 /*
3747 * Handle EXPORT from MDS. Cap is being migrated _from_ this mds to a
3748 * different one. If we are the most recent migration we've seen (as
3749 * indicated by mseq), make note of the migrating cap bits for the
3750 * duration (until we see the corresponding IMPORT).
3751 *
3752 * caller holds s_mutex
3753 */
3754 static void handle_cap_export(struct inode *inode, struct ceph_mds_caps *ex,
3755 struct ceph_mds_cap_peer *ph,
3756 struct ceph_mds_session *session)
3757 {
3758 struct ceph_mds_client *mdsc = ceph_inode_to_client(inode)->mdsc;
3759 struct ceph_mds_session *tsession = NULL;
3760 struct ceph_cap *cap, *tcap, *new_cap = NULL;
3761 struct ceph_inode_info *ci = ceph_inode(inode);
3762 u64 t_cap_id;
3763 unsigned mseq = le32_to_cpu(ex->migrate_seq);
3764 unsigned t_seq, t_mseq;
3765 int target, issued;
3766 int mds = session->s_mds;
3767
3768 if (ph) {
3769 t_cap_id = le64_to_cpu(ph->cap_id);
3770 t_seq = le32_to_cpu(ph->seq);
3771 t_mseq = le32_to_cpu(ph->mseq);
3772 target = le32_to_cpu(ph->mds);
3773 } else {
3774 t_cap_id = t_seq = t_mseq = 0;
3775 target = -1;
3776 }
3777
3778 dout("handle_cap_export inode %p ci %p mds%d mseq %d target %d\n",
3779 inode, ci, mds, mseq, target);
3780 retry:
3781 spin_lock(&ci->i_ceph_lock);
3782 cap = __get_cap_for_mds(ci, mds);
3783 if (!cap || cap->cap_id != le64_to_cpu(ex->cap_id))
3784 goto out_unlock;
3785
3786 if (target < 0) {
3787 __ceph_remove_cap(cap, false);
3788 goto out_unlock;
3789 }
3790
3791 /*
3792 * now we know we haven't received the cap import message yet
3793 * because the exported cap still exist.
3794 */
3795
3796 issued = cap->issued;
3797 if (issued != cap->implemented)
3798 pr_err_ratelimited("handle_cap_export: issued != implemented: "
3799 "ino (%llx.%llx) mds%d seq %d mseq %d "
3800 "issued %s implemented %s\n",
3801 ceph_vinop(inode), mds, cap->seq, cap->mseq,
3802 ceph_cap_string(issued),
3803 ceph_cap_string(cap->implemented));
3804
3805
3806 tcap = __get_cap_for_mds(ci, target);
3807 if (tcap) {
3808 /* already have caps from the target */
3809 if (tcap->cap_id == t_cap_id &&
3810 ceph_seq_cmp(tcap->seq, t_seq) < 0) {
3811 dout(" updating import cap %p mds%d\n", tcap, target);
3812 tcap->cap_id = t_cap_id;
3813 tcap->seq = t_seq - 1;
3814 tcap->issue_seq = t_seq - 1;
3815 tcap->issued |= issued;
3816 tcap->implemented |= issued;
3817 if (cap == ci->i_auth_cap) {
3818 ci->i_auth_cap = tcap;
3819 change_auth_cap_ses(ci, tcap->session);
3820 }
3821 }
3822 __ceph_remove_cap(cap, false);
3823 goto out_unlock;
3824 } else if (tsession) {
3825 /* add placeholder for the export tagert */
3826 int flag = (cap == ci->i_auth_cap) ? CEPH_CAP_FLAG_AUTH : 0;
3827 tcap = new_cap;
3828 ceph_add_cap(inode, tsession, t_cap_id, issued, 0,
3829 t_seq - 1, t_mseq, (u64)-1, flag, &new_cap);
3830
3831 if (!list_empty(&ci->i_cap_flush_list) &&
3832 ci->i_auth_cap == tcap) {
3833 spin_lock(&mdsc->cap_dirty_lock);
3834 list_move_tail(&ci->i_flushing_item,
3835 &tcap->session->s_cap_flushing);
3836 spin_unlock(&mdsc->cap_dirty_lock);
3837 }
3838
3839 __ceph_remove_cap(cap, false);
3840 goto out_unlock;
3841 }
3842
3843 spin_unlock(&ci->i_ceph_lock);
3844 mutex_unlock(&session->s_mutex);
3845
3846 /* open target session */
3847 tsession = ceph_mdsc_open_export_target_session(mdsc, target);
3848 if (!IS_ERR(tsession)) {
3849 if (mds > target) {
3850 mutex_lock(&session->s_mutex);
3851 mutex_lock_nested(&tsession->s_mutex,
3852 SINGLE_DEPTH_NESTING);
3853 } else {
3854 mutex_lock(&tsession->s_mutex);
3855 mutex_lock_nested(&session->s_mutex,
3856 SINGLE_DEPTH_NESTING);
3857 }
3858 new_cap = ceph_get_cap(mdsc, NULL);
3859 } else {
3860 WARN_ON(1);
3861 tsession = NULL;
3862 target = -1;
3863 mutex_lock(&session->s_mutex);
3864 }
3865 goto retry;
3866
3867 out_unlock:
3868 spin_unlock(&ci->i_ceph_lock);
3869 mutex_unlock(&session->s_mutex);
3870 if (tsession) {
3871 mutex_unlock(&tsession->s_mutex);
3872 ceph_put_mds_session(tsession);
3873 }
3874 if (new_cap)
3875 ceph_put_cap(mdsc, new_cap);
3876 }
3877
3878 /*
3879 * Handle cap IMPORT.
3880 *
3881 * caller holds s_mutex. acquires i_ceph_lock
3882 */
3883 static void handle_cap_import(struct ceph_mds_client *mdsc,
3884 struct inode *inode, struct ceph_mds_caps *im,
3885 struct ceph_mds_cap_peer *ph,
3886 struct ceph_mds_session *session,
3887 struct ceph_cap **target_cap, int *old_issued)
3888 {
3889 struct ceph_inode_info *ci = ceph_inode(inode);
3890 struct ceph_cap *cap, *ocap, *new_cap = NULL;
3891 int mds = session->s_mds;
3892 int issued;
3893 unsigned caps = le32_to_cpu(im->caps);
3894 unsigned wanted = le32_to_cpu(im->wanted);
3895 unsigned seq = le32_to_cpu(im->seq);
3896 unsigned mseq = le32_to_cpu(im->migrate_seq);
3897 u64 realmino = le64_to_cpu(im->realm);
3898 u64 cap_id = le64_to_cpu(im->cap_id);
3899 u64 p_cap_id;
3900 int peer;
3901
3902 if (ph) {
3903 p_cap_id = le64_to_cpu(ph->cap_id);
3904 peer = le32_to_cpu(ph->mds);
3905 } else {
3906 p_cap_id = 0;
3907 peer = -1;
3908 }
3909
3910 dout("handle_cap_import inode %p ci %p mds%d mseq %d peer %d\n",
3911 inode, ci, mds, mseq, peer);
3912 retry:
3913 cap = __get_cap_for_mds(ci, mds);
3914 if (!cap) {
3915 if (!new_cap) {
3916 spin_unlock(&ci->i_ceph_lock);
3917 new_cap = ceph_get_cap(mdsc, NULL);
3918 spin_lock(&ci->i_ceph_lock);
3919 goto retry;
3920 }
3921 cap = new_cap;
3922 } else {
3923 if (new_cap) {
3924 ceph_put_cap(mdsc, new_cap);
3925 new_cap = NULL;
3926 }
3927 }
3928
3929 __ceph_caps_issued(ci, &issued);
3930 issued |= __ceph_caps_dirty(ci);
3931
3932 ceph_add_cap(inode, session, cap_id, caps, wanted, seq, mseq,
3933 realmino, CEPH_CAP_FLAG_AUTH, &new_cap);
3934
3935 ocap = peer >= 0 ? __get_cap_for_mds(ci, peer) : NULL;
3936 if (ocap && ocap->cap_id == p_cap_id) {
3937 dout(" remove export cap %p mds%d flags %d\n",
3938 ocap, peer, ph->flags);
3939 if ((ph->flags & CEPH_CAP_FLAG_AUTH) &&
3940 (ocap->seq != le32_to_cpu(ph->seq) ||
3941 ocap->mseq != le32_to_cpu(ph->mseq))) {
3942 pr_err_ratelimited("handle_cap_import: "
3943 "mismatched seq/mseq: ino (%llx.%llx) "
3944 "mds%d seq %d mseq %d importer mds%d "
3945 "has peer seq %d mseq %d\n",
3946 ceph_vinop(inode), peer, ocap->seq,
3947 ocap->mseq, mds, le32_to_cpu(ph->seq),
3948 le32_to_cpu(ph->mseq));
3949 }
3950 __ceph_remove_cap(ocap, (ph->flags & CEPH_CAP_FLAG_RELEASE));
3951 }
3952
3953 *old_issued = issued;
3954 *target_cap = cap;
3955 }
3956
3957 /*
3958 * Handle a caps message from the MDS.
3959 *
3960 * Identify the appropriate session, inode, and call the right handler
3961 * based on the cap op.
3962 */
3963 void ceph_handle_caps(struct ceph_mds_session *session,
3964 struct ceph_msg *msg)
3965 {
3966 struct ceph_mds_client *mdsc = session->s_mdsc;
3967 struct inode *inode;
3968 struct ceph_inode_info *ci;
3969 struct ceph_cap *cap;
3970 struct ceph_mds_caps *h;
3971 struct ceph_mds_cap_peer *peer = NULL;
3972 struct ceph_snap_realm *realm = NULL;
3973 int op;
3974 int msg_version = le16_to_cpu(msg->hdr.version);
3975 u32 seq, mseq;
3976 struct ceph_vino vino;
3977 void *snaptrace;
3978 size_t snaptrace_len;
3979 void *p, *end;
3980 struct cap_extra_info extra_info = {};
3981 bool queue_trunc;
3982
3983 dout("handle_caps from mds%d\n", session->s_mds);
3984
3985 /* decode */
3986 end = msg->front.iov_base + msg->front.iov_len;
3987 if (msg->front.iov_len < sizeof(*h))
3988 goto bad;
3989 h = msg->front.iov_base;
3990 op = le32_to_cpu(h->op);
3991 vino.ino = le64_to_cpu(h->ino);
3992 vino.snap = CEPH_NOSNAP;
3993 seq = le32_to_cpu(h->seq);
3994 mseq = le32_to_cpu(h->migrate_seq);
3995
3996 snaptrace = h + 1;
3997 snaptrace_len = le32_to_cpu(h->snap_trace_len);
3998 p = snaptrace + snaptrace_len;
3999
4000 if (msg_version >= 2) {
4001 u32 flock_len;
4002 ceph_decode_32_safe(&p, end, flock_len, bad);
4003 if (p + flock_len > end)
4004 goto bad;
4005 p += flock_len;
4006 }
4007
4008 if (msg_version >= 3) {
4009 if (op == CEPH_CAP_OP_IMPORT) {
4010 if (p + sizeof(*peer) > end)
4011 goto bad;
4012 peer = p;
4013 p += sizeof(*peer);
4014 } else if (op == CEPH_CAP_OP_EXPORT) {
4015 /* recorded in unused fields */
4016 peer = (void *)&h->size;
4017 }
4018 }
4019
4020 if (msg_version >= 4) {
4021 ceph_decode_64_safe(&p, end, extra_info.inline_version, bad);
4022 ceph_decode_32_safe(&p, end, extra_info.inline_len, bad);
4023 if (p + extra_info.inline_len > end)
4024 goto bad;
4025 extra_info.inline_data = p;
4026 p += extra_info.inline_len;
4027 }
4028
4029 if (msg_version >= 5) {
4030 struct ceph_osd_client *osdc = &mdsc->fsc->client->osdc;
4031 u32 epoch_barrier;
4032
4033 ceph_decode_32_safe(&p, end, epoch_barrier, bad);
4034 ceph_osdc_update_epoch_barrier(osdc, epoch_barrier);
4035 }
4036
4037 if (msg_version >= 8) {
4038 u32 pool_ns_len;
4039
4040 /* version >= 6 */
4041 ceph_decode_skip_64(&p, end, bad); // flush_tid
4042 /* version >= 7 */
4043 ceph_decode_skip_32(&p, end, bad); // caller_uid
4044 ceph_decode_skip_32(&p, end, bad); // caller_gid
4045 /* version >= 8 */
4046 ceph_decode_32_safe(&p, end, pool_ns_len, bad);
4047 if (pool_ns_len > 0) {
4048 ceph_decode_need(&p, end, pool_ns_len, bad);
4049 extra_info.pool_ns =
4050 ceph_find_or_create_string(p, pool_ns_len);
4051 p += pool_ns_len;
4052 }
4053 }
4054
4055 if (msg_version >= 9) {
4056 struct ceph_timespec *btime;
4057
4058 if (p + sizeof(*btime) > end)
4059 goto bad;
4060 btime = p;
4061 ceph_decode_timespec64(&extra_info.btime, btime);
4062 p += sizeof(*btime);
4063 ceph_decode_64_safe(&p, end, extra_info.change_attr, bad);
4064 }
4065
4066 if (msg_version >= 11) {
4067 /* version >= 10 */
4068 ceph_decode_skip_32(&p, end, bad); // flags
4069 /* version >= 11 */
4070 extra_info.dirstat_valid = true;
4071 ceph_decode_64_safe(&p, end, extra_info.nfiles, bad);
4072 ceph_decode_64_safe(&p, end, extra_info.nsubdirs, bad);
4073 }
4074
4075 /* lookup ino */
4076 inode = ceph_find_inode(mdsc->fsc->sb, vino);
4077 ci = ceph_inode(inode);
4078 dout(" op %s ino %llx.%llx inode %p\n", ceph_cap_op_name(op), vino.ino,
4079 vino.snap, inode);
4080
4081 mutex_lock(&session->s_mutex);
4082 inc_session_sequence(session);
4083 dout(" mds%d seq %lld cap seq %u\n", session->s_mds, session->s_seq,
4084 (unsigned)seq);
4085
4086 if (!inode) {
4087 dout(" i don't have ino %llx\n", vino.ino);
4088
4089 if (op == CEPH_CAP_OP_IMPORT) {
4090 cap = ceph_get_cap(mdsc, NULL);
4091 cap->cap_ino = vino.ino;
4092 cap->queue_release = 1;
4093 cap->cap_id = le64_to_cpu(h->cap_id);
4094 cap->mseq = mseq;
4095 cap->seq = seq;
4096 cap->issue_seq = seq;
4097 spin_lock(&session->s_cap_lock);
4098 __ceph_queue_cap_release(session, cap);
4099 spin_unlock(&session->s_cap_lock);
4100 }
4101 goto flush_cap_releases;
4102 }
4103
4104 /* these will work even if we don't have a cap yet */
4105 switch (op) {
4106 case CEPH_CAP_OP_FLUSHSNAP_ACK:
4107 handle_cap_flushsnap_ack(inode, le64_to_cpu(msg->hdr.tid),
4108 h, session);
4109 goto done;
4110
4111 case CEPH_CAP_OP_EXPORT:
4112 handle_cap_export(inode, h, peer, session);
4113 goto done_unlocked;
4114
4115 case CEPH_CAP_OP_IMPORT:
4116 realm = NULL;
4117 if (snaptrace_len) {
4118 down_write(&mdsc->snap_rwsem);
4119 ceph_update_snap_trace(mdsc, snaptrace,
4120 snaptrace + snaptrace_len,
4121 false, &realm);
4122 downgrade_write(&mdsc->snap_rwsem);
4123 } else {
4124 down_read(&mdsc->snap_rwsem);
4125 }
4126 spin_lock(&ci->i_ceph_lock);
4127 handle_cap_import(mdsc, inode, h, peer, session,
4128 &cap, &extra_info.issued);
4129 handle_cap_grant(inode, session, cap,
4130 h, msg->middle, &extra_info);
4131 if (realm)
4132 ceph_put_snap_realm(mdsc, realm);
4133 goto done_unlocked;
4134 }
4135
4136 /* the rest require a cap */
4137 spin_lock(&ci->i_ceph_lock);
4138 cap = __get_cap_for_mds(ceph_inode(inode), session->s_mds);
4139 if (!cap) {
4140 dout(" no cap on %p ino %llx.%llx from mds%d\n",
4141 inode, ceph_ino(inode), ceph_snap(inode),
4142 session->s_mds);
4143 spin_unlock(&ci->i_ceph_lock);
4144 goto flush_cap_releases;
4145 }
4146
4147 /* note that each of these drops i_ceph_lock for us */
4148 switch (op) {
4149 case CEPH_CAP_OP_REVOKE:
4150 case CEPH_CAP_OP_GRANT:
4151 __ceph_caps_issued(ci, &extra_info.issued);
4152 extra_info.issued |= __ceph_caps_dirty(ci);
4153 handle_cap_grant(inode, session, cap,
4154 h, msg->middle, &extra_info);
4155 goto done_unlocked;
4156
4157 case CEPH_CAP_OP_FLUSH_ACK:
4158 handle_cap_flush_ack(inode, le64_to_cpu(msg->hdr.tid),
4159 h, session, cap);
4160 break;
4161
4162 case CEPH_CAP_OP_TRUNC:
4163 queue_trunc = handle_cap_trunc(inode, h, session);
4164 spin_unlock(&ci->i_ceph_lock);
4165 if (queue_trunc)
4166 ceph_queue_vmtruncate(inode);
4167 break;
4168
4169 default:
4170 spin_unlock(&ci->i_ceph_lock);
4171 pr_err("ceph_handle_caps: unknown cap op %d %s\n", op,
4172 ceph_cap_op_name(op));
4173 }
4174
4175 done:
4176 mutex_unlock(&session->s_mutex);
4177 done_unlocked:
4178 ceph_put_string(extra_info.pool_ns);
4179 /* avoid calling iput_final() in mds dispatch threads */
4180 ceph_async_iput(inode);
4181 return;
4182
4183 flush_cap_releases:
4184 /*
4185 * send any cap release message to try to move things
4186 * along for the mds (who clearly thinks we still have this
4187 * cap).
4188 */
4189 ceph_flush_cap_releases(mdsc, session);
4190 goto done;
4191
4192 bad:
4193 pr_err("ceph_handle_caps: corrupt message\n");
4194 ceph_msg_dump(msg);
4195 return;
4196 }
4197
4198 /*
4199 * Delayed work handler to process end of delayed cap release LRU list.
4200 */
4201 void ceph_check_delayed_caps(struct ceph_mds_client *mdsc)
4202 {
4203 struct inode *inode;
4204 struct ceph_inode_info *ci;
4205
4206 dout("check_delayed_caps\n");
4207 spin_lock(&mdsc->cap_delay_lock);
4208 while (!list_empty(&mdsc->cap_delay_list)) {
4209 ci = list_first_entry(&mdsc->cap_delay_list,
4210 struct ceph_inode_info,
4211 i_cap_delay_list);
4212 if ((ci->i_ceph_flags & CEPH_I_FLUSH) == 0 &&
4213 time_before(jiffies, ci->i_hold_caps_max))
4214 break;
4215 list_del_init(&ci->i_cap_delay_list);
4216
4217 inode = igrab(&ci->vfs_inode);
4218 if (inode) {
4219 spin_unlock(&mdsc->cap_delay_lock);
4220 dout("check_delayed_caps on %p\n", inode);
4221 ceph_check_caps(ci, 0, NULL);
4222 /* avoid calling iput_final() in tick thread */
4223 ceph_async_iput(inode);
4224 spin_lock(&mdsc->cap_delay_lock);
4225 }
4226 }
4227 spin_unlock(&mdsc->cap_delay_lock);
4228 }
4229
4230 /*
4231 * Flush all dirty caps to the mds
4232 */
4233 static void flush_dirty_session_caps(struct ceph_mds_session *s)
4234 {
4235 struct ceph_mds_client *mdsc = s->s_mdsc;
4236 struct ceph_inode_info *ci;
4237 struct inode *inode;
4238
4239 dout("flush_dirty_caps\n");
4240 spin_lock(&mdsc->cap_dirty_lock);
4241 while (!list_empty(&s->s_cap_dirty)) {
4242 ci = list_first_entry(&s->s_cap_dirty, struct ceph_inode_info,
4243 i_dirty_item);
4244 inode = &ci->vfs_inode;
4245 ihold(inode);
4246 dout("flush_dirty_caps %p\n", inode);
4247 spin_unlock(&mdsc->cap_dirty_lock);
4248 ceph_check_caps(ci, CHECK_CAPS_FLUSH, NULL);
4249 iput(inode);
4250 spin_lock(&mdsc->cap_dirty_lock);
4251 }
4252 spin_unlock(&mdsc->cap_dirty_lock);
4253 dout("flush_dirty_caps done\n");
4254 }
4255
4256 static void iterate_sessions(struct ceph_mds_client *mdsc,
4257 void (*cb)(struct ceph_mds_session *))
4258 {
4259 int mds;
4260
4261 mutex_lock(&mdsc->mutex);
4262 for (mds = 0; mds < mdsc->max_sessions; ++mds) {
4263 struct ceph_mds_session *s;
4264
4265 if (!mdsc->sessions[mds])
4266 continue;
4267
4268 s = ceph_get_mds_session(mdsc->sessions[mds]);
4269 if (!s)
4270 continue;
4271
4272 mutex_unlock(&mdsc->mutex);
4273 cb(s);
4274 ceph_put_mds_session(s);
4275 mutex_lock(&mdsc->mutex);
4276 }
4277 mutex_unlock(&mdsc->mutex);
4278 }
4279
4280 void ceph_flush_dirty_caps(struct ceph_mds_client *mdsc)
4281 {
4282 iterate_sessions(mdsc, flush_dirty_session_caps);
4283 }
4284
4285 void __ceph_touch_fmode(struct ceph_inode_info *ci,
4286 struct ceph_mds_client *mdsc, int fmode)
4287 {
4288 unsigned long now = jiffies;
4289 if (fmode & CEPH_FILE_MODE_RD)
4290 ci->i_last_rd = now;
4291 if (fmode & CEPH_FILE_MODE_WR)
4292 ci->i_last_wr = now;
4293 /* queue periodic check */
4294 if (fmode &&
4295 __ceph_is_any_real_caps(ci) &&
4296 list_empty(&ci->i_cap_delay_list))
4297 __cap_delay_requeue(mdsc, ci);
4298 }
4299
4300 void ceph_get_fmode(struct ceph_inode_info *ci, int fmode, int count)
4301 {
4302 struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(ci->vfs_inode.i_sb);
4303 int bits = (fmode << 1) | 1;
4304 bool is_opened = false;
4305 int i;
4306
4307 if (count == 1)
4308 atomic64_inc(&mdsc->metric.opened_files);
4309
4310 spin_lock(&ci->i_ceph_lock);
4311 for (i = 0; i < CEPH_FILE_MODE_BITS; i++) {
4312 if (bits & (1 << i))
4313 ci->i_nr_by_mode[i] += count;
4314
4315 /*
4316 * If any of the mode ref is larger than 1,
4317 * that means it has been already opened by
4318 * others. Just skip checking the PIN ref.
4319 */
4320 if (i && ci->i_nr_by_mode[i] > 1)
4321 is_opened = true;
4322 }
4323
4324 if (!is_opened)
4325 percpu_counter_inc(&mdsc->metric.opened_inodes);
4326 spin_unlock(&ci->i_ceph_lock);
4327 }
4328
4329 /*
4330 * Drop open file reference. If we were the last open file,
4331 * we may need to release capabilities to the MDS (or schedule
4332 * their delayed release).
4333 */
4334 void ceph_put_fmode(struct ceph_inode_info *ci, int fmode, int count)
4335 {
4336 struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(ci->vfs_inode.i_sb);
4337 int bits = (fmode << 1) | 1;
4338 bool is_closed = true;
4339 int i;
4340
4341 if (count == 1)
4342 atomic64_dec(&mdsc->metric.opened_files);
4343
4344 spin_lock(&ci->i_ceph_lock);
4345 for (i = 0; i < CEPH_FILE_MODE_BITS; i++) {
4346 if (bits & (1 << i)) {
4347 BUG_ON(ci->i_nr_by_mode[i] < count);
4348 ci->i_nr_by_mode[i] -= count;
4349 }
4350
4351 /*
4352 * If any of the mode ref is not 0 after
4353 * decreased, that means it is still opened
4354 * by others. Just skip checking the PIN ref.
4355 */
4356 if (i && ci->i_nr_by_mode[i])
4357 is_closed = false;
4358 }
4359
4360 if (is_closed)
4361 percpu_counter_dec(&mdsc->metric.opened_inodes);
4362 spin_unlock(&ci->i_ceph_lock);
4363 }
4364
4365 /*
4366 * For a soon-to-be unlinked file, drop the LINK caps. If it
4367 * looks like the link count will hit 0, drop any other caps (other
4368 * than PIN) we don't specifically want (due to the file still being
4369 * open).
4370 */
4371 int ceph_drop_caps_for_unlink(struct inode *inode)
4372 {
4373 struct ceph_inode_info *ci = ceph_inode(inode);
4374 int drop = CEPH_CAP_LINK_SHARED | CEPH_CAP_LINK_EXCL;
4375
4376 spin_lock(&ci->i_ceph_lock);
4377 if (inode->i_nlink == 1) {
4378 drop |= ~(__ceph_caps_wanted(ci) | CEPH_CAP_PIN);
4379
4380 if (__ceph_caps_dirty(ci)) {
4381 struct ceph_mds_client *mdsc =
4382 ceph_inode_to_client(inode)->mdsc;
4383 __cap_delay_requeue_front(mdsc, ci);
4384 }
4385 }
4386 spin_unlock(&ci->i_ceph_lock);
4387 return drop;
4388 }
4389
4390 /*
4391 * Helpers for embedding cap and dentry lease releases into mds
4392 * requests.
4393 *
4394 * @force is used by dentry_release (below) to force inclusion of a
4395 * record for the directory inode, even when there aren't any caps to
4396 * drop.
4397 */
4398 int ceph_encode_inode_release(void **p, struct inode *inode,
4399 int mds, int drop, int unless, int force)
4400 {
4401 struct ceph_inode_info *ci = ceph_inode(inode);
4402 struct ceph_cap *cap;
4403 struct ceph_mds_request_release *rel = *p;
4404 int used, dirty;
4405 int ret = 0;
4406
4407 spin_lock(&ci->i_ceph_lock);
4408 used = __ceph_caps_used(ci);
4409 dirty = __ceph_caps_dirty(ci);
4410
4411 dout("encode_inode_release %p mds%d used|dirty %s drop %s unless %s\n",
4412 inode, mds, ceph_cap_string(used|dirty), ceph_cap_string(drop),
4413 ceph_cap_string(unless));
4414
4415 /* only drop unused, clean caps */
4416 drop &= ~(used | dirty);
4417
4418 cap = __get_cap_for_mds(ci, mds);
4419 if (cap && __cap_is_valid(cap)) {
4420 unless &= cap->issued;
4421 if (unless) {
4422 if (unless & CEPH_CAP_AUTH_EXCL)
4423 drop &= ~CEPH_CAP_AUTH_SHARED;
4424 if (unless & CEPH_CAP_LINK_EXCL)
4425 drop &= ~CEPH_CAP_LINK_SHARED;
4426 if (unless & CEPH_CAP_XATTR_EXCL)
4427 drop &= ~CEPH_CAP_XATTR_SHARED;
4428 if (unless & CEPH_CAP_FILE_EXCL)
4429 drop &= ~CEPH_CAP_FILE_SHARED;
4430 }
4431
4432 if (force || (cap->issued & drop)) {
4433 if (cap->issued & drop) {
4434 int wanted = __ceph_caps_wanted(ci);
4435 dout("encode_inode_release %p cap %p "
4436 "%s -> %s, wanted %s -> %s\n", inode, cap,
4437 ceph_cap_string(cap->issued),
4438 ceph_cap_string(cap->issued & ~drop),
4439 ceph_cap_string(cap->mds_wanted),
4440 ceph_cap_string(wanted));
4441
4442 cap->issued &= ~drop;
4443 cap->implemented &= ~drop;
4444 cap->mds_wanted = wanted;
4445 if (cap == ci->i_auth_cap &&
4446 !(wanted & CEPH_CAP_ANY_FILE_WR))
4447 ci->i_requested_max_size = 0;
4448 } else {
4449 dout("encode_inode_release %p cap %p %s"
4450 " (force)\n", inode, cap,
4451 ceph_cap_string(cap->issued));
4452 }
4453
4454 rel->ino = cpu_to_le64(ceph_ino(inode));
4455 rel->cap_id = cpu_to_le64(cap->cap_id);
4456 rel->seq = cpu_to_le32(cap->seq);
4457 rel->issue_seq = cpu_to_le32(cap->issue_seq);
4458 rel->mseq = cpu_to_le32(cap->mseq);
4459 rel->caps = cpu_to_le32(cap->implemented);
4460 rel->wanted = cpu_to_le32(cap->mds_wanted);
4461 rel->dname_len = 0;
4462 rel->dname_seq = 0;
4463 *p += sizeof(*rel);
4464 ret = 1;
4465 } else {
4466 dout("encode_inode_release %p cap %p %s (noop)\n",
4467 inode, cap, ceph_cap_string(cap->issued));
4468 }
4469 }
4470 spin_unlock(&ci->i_ceph_lock);
4471 return ret;
4472 }
4473
4474 int ceph_encode_dentry_release(void **p, struct dentry *dentry,
4475 struct inode *dir,
4476 int mds, int drop, int unless)
4477 {
4478 struct dentry *parent = NULL;
4479 struct ceph_mds_request_release *rel = *p;
4480 struct ceph_dentry_info *di = ceph_dentry(dentry);
4481 int force = 0;
4482 int ret;
4483
4484 /*
4485 * force an record for the directory caps if we have a dentry lease.
4486 * this is racy (can't take i_ceph_lock and d_lock together), but it
4487 * doesn't have to be perfect; the mds will revoke anything we don't
4488 * release.
4489 */
4490 spin_lock(&dentry->d_lock);
4491 if (di->lease_session && di->lease_session->s_mds == mds)
4492 force = 1;
4493 if (!dir) {
4494 parent = dget(dentry->d_parent);
4495 dir = d_inode(parent);
4496 }
4497 spin_unlock(&dentry->d_lock);
4498
4499 ret = ceph_encode_inode_release(p, dir, mds, drop, unless, force);
4500 dput(parent);
4501
4502 spin_lock(&dentry->d_lock);
4503 if (ret && di->lease_session && di->lease_session->s_mds == mds) {
4504 dout("encode_dentry_release %p mds%d seq %d\n",
4505 dentry, mds, (int)di->lease_seq);
4506 rel->dname_len = cpu_to_le32(dentry->d_name.len);
4507 memcpy(*p, dentry->d_name.name, dentry->d_name.len);
4508 *p += dentry->d_name.len;
4509 rel->dname_seq = cpu_to_le32(di->lease_seq);
4510 __ceph_mdsc_drop_dentry_lease(dentry);
4511 }
4512 spin_unlock(&dentry->d_lock);
4513 return ret;
4514 }
Linux with added FPC-III support