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