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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
43
44/*
45 * Generate readable cap strings for debugging output.
46 */
47#define MAX_CAP_STR 20
48static char cap_str[MAX_CAP_STR][40];
49static DEFINE_SPINLOCK(cap_str_lock);
50static int last_cap_str;
51
52static char *gcap_string(char *s, int c)
53{
54 if (c & CEPH_CAP_GSHARED)
55 *s++ = 's';
56 if (c & CEPH_CAP_GEXCL)
57 *s++ = 'x';
58 if (c & CEPH_CAP_GCACHE)
59 *s++ = 'c';
60 if (c & CEPH_CAP_GRD)
61 *s++ = 'r';
62 if (c & CEPH_CAP_GWR)
63 *s++ = 'w';
64 if (c & CEPH_CAP_GBUFFER)
65 *s++ = 'b';
66 if (c & CEPH_CAP_GLAZYIO)
67 *s++ = 'l';
68 return s;
69}
70
71const char *ceph_cap_string(int caps)
72{
73 int i;
74 char *s;
75 int c;
76
77 spin_lock(&cap_str_lock);
78 i = last_cap_str++;
79 if (last_cap_str == MAX_CAP_STR)
80 last_cap_str = 0;
81 spin_unlock(&cap_str_lock);
82
83 s = cap_str[i];
84
85 if (caps & CEPH_CAP_PIN)
86 *s++ = 'p';
87
88 c = (caps >> CEPH_CAP_SAUTH) & 3;
89 if (c) {
90 *s++ = 'A';
91 s = gcap_string(s, c);
92 }
93
94 c = (caps >> CEPH_CAP_SLINK) & 3;
95 if (c) {
96 *s++ = 'L';
97 s = gcap_string(s, c);
98 }
99
100 c = (caps >> CEPH_CAP_SXATTR) & 3;
101 if (c) {
102 *s++ = 'X';
103 s = gcap_string(s, c);
104 }
105
106 c = caps >> CEPH_CAP_SFILE;
107 if (c) {
108 *s++ = 'F';
109 s = gcap_string(s, c);
110 }
111
112 if (s == cap_str[i])
113 *s++ = '-';
114 *s = 0;
115 return cap_str[i];
116}
117
118void ceph_caps_init(struct ceph_mds_client *mdsc)
119{
120 INIT_LIST_HEAD(&mdsc->caps_list);
121 spin_lock_init(&mdsc->caps_list_lock);
122}
123
124void ceph_caps_finalize(struct ceph_mds_client *mdsc)
125{
126 struct ceph_cap *cap;
127
128 spin_lock(&mdsc->caps_list_lock);
129 while (!list_empty(&mdsc->caps_list)) {
130 cap = list_first_entry(&mdsc->caps_list,
131 struct ceph_cap, caps_item);
132 list_del(&cap->caps_item);
133 kmem_cache_free(ceph_cap_cachep, cap);
134 }
135 mdsc->caps_total_count = 0;
136 mdsc->caps_avail_count = 0;
137 mdsc->caps_use_count = 0;
138 mdsc->caps_reserve_count = 0;
139 mdsc->caps_min_count = 0;
140 spin_unlock(&mdsc->caps_list_lock);
141}
142
143void ceph_adjust_min_caps(struct ceph_mds_client *mdsc, int delta)
144{
145 spin_lock(&mdsc->caps_list_lock);
146 mdsc->caps_min_count += delta;
147 BUG_ON(mdsc->caps_min_count < 0);
148 spin_unlock(&mdsc->caps_list_lock);
149}
150
151void ceph_reserve_caps(struct ceph_mds_client *mdsc,
152 struct ceph_cap_reservation *ctx, int need)
153{
154 int i;
155 struct ceph_cap *cap;
156 int have;
157 int alloc = 0;
158 LIST_HEAD(newcaps);
159
160 dout("reserve caps ctx=%p need=%d\n", ctx, need);
161
162 /* first reserve any caps that are already allocated */
163 spin_lock(&mdsc->caps_list_lock);
164 if (mdsc->caps_avail_count >= need)
165 have = need;
166 else
167 have = mdsc->caps_avail_count;
168 mdsc->caps_avail_count -= have;
169 mdsc->caps_reserve_count += have;
170 BUG_ON(mdsc->caps_total_count != mdsc->caps_use_count +
171 mdsc->caps_reserve_count +
172 mdsc->caps_avail_count);
173 spin_unlock(&mdsc->caps_list_lock);
174
175 for (i = have; i < need; i++) {
176 cap = kmem_cache_alloc(ceph_cap_cachep, GFP_NOFS);
177 if (!cap)
178 break;
179 list_add(&cap->caps_item, &newcaps);
180 alloc++;
181 }
182 /* we didn't manage to reserve as much as we needed */
183 if (have + alloc != need)
184 pr_warn("reserve caps ctx=%p ENOMEM need=%d got=%d\n",
185 ctx, need, have + alloc);
186
187 spin_lock(&mdsc->caps_list_lock);
188 mdsc->caps_total_count += alloc;
189 mdsc->caps_reserve_count += alloc;
190 list_splice(&newcaps, &mdsc->caps_list);
191
192 BUG_ON(mdsc->caps_total_count != mdsc->caps_use_count +
193 mdsc->caps_reserve_count +
194 mdsc->caps_avail_count);
195 spin_unlock(&mdsc->caps_list_lock);
196
197 ctx->count = need;
198 dout("reserve caps ctx=%p %d = %d used + %d resv + %d avail\n",
199 ctx, mdsc->caps_total_count, mdsc->caps_use_count,
200 mdsc->caps_reserve_count, mdsc->caps_avail_count);
201}
202
203int ceph_unreserve_caps(struct ceph_mds_client *mdsc,
204 struct ceph_cap_reservation *ctx)
205{
206 dout("unreserve caps ctx=%p count=%d\n", ctx, ctx->count);
207 if (ctx->count) {
208 spin_lock(&mdsc->caps_list_lock);
209 BUG_ON(mdsc->caps_reserve_count < ctx->count);
210 mdsc->caps_reserve_count -= ctx->count;
211 mdsc->caps_avail_count += ctx->count;
212 ctx->count = 0;
213 dout("unreserve caps %d = %d used + %d resv + %d avail\n",
214 mdsc->caps_total_count, mdsc->caps_use_count,
215 mdsc->caps_reserve_count, mdsc->caps_avail_count);
216 BUG_ON(mdsc->caps_total_count != mdsc->caps_use_count +
217 mdsc->caps_reserve_count +
218 mdsc->caps_avail_count);
219 spin_unlock(&mdsc->caps_list_lock);
220 }
221 return 0;
222}
223
224static struct ceph_cap *get_cap(struct ceph_mds_client *mdsc,
225 struct ceph_cap_reservation *ctx)
226{
227 struct ceph_cap *cap = NULL;
228
229 /* temporary, until we do something about cap import/export */
230 if (!ctx) {
231 cap = kmem_cache_alloc(ceph_cap_cachep, GFP_NOFS);
232 if (cap) {
233 spin_lock(&mdsc->caps_list_lock);
234 mdsc->caps_use_count++;
235 mdsc->caps_total_count++;
236 spin_unlock(&mdsc->caps_list_lock);
237 }
238 return cap;
239 }
240
241 spin_lock(&mdsc->caps_list_lock);
242 dout("get_cap ctx=%p (%d) %d = %d used + %d resv + %d avail\n",
243 ctx, ctx->count, mdsc->caps_total_count, mdsc->caps_use_count,
244 mdsc->caps_reserve_count, mdsc->caps_avail_count);
245 BUG_ON(!ctx->count);
246 BUG_ON(ctx->count > mdsc->caps_reserve_count);
247 BUG_ON(list_empty(&mdsc->caps_list));
248
249 ctx->count--;
250 mdsc->caps_reserve_count--;
251 mdsc->caps_use_count++;
252
253 cap = list_first_entry(&mdsc->caps_list, struct ceph_cap, caps_item);
254 list_del(&cap->caps_item);
255
256 BUG_ON(mdsc->caps_total_count != mdsc->caps_use_count +
257 mdsc->caps_reserve_count + mdsc->caps_avail_count);
258 spin_unlock(&mdsc->caps_list_lock);
259 return cap;
260}
261
262void ceph_put_cap(struct ceph_mds_client *mdsc, struct ceph_cap *cap)
263{
264 spin_lock(&mdsc->caps_list_lock);
265 dout("put_cap %p %d = %d used + %d resv + %d avail\n",
266 cap, mdsc->caps_total_count, mdsc->caps_use_count,
267 mdsc->caps_reserve_count, mdsc->caps_avail_count);
268 mdsc->caps_use_count--;
269 /*
270 * Keep some preallocated caps around (ceph_min_count), to
271 * avoid lots of free/alloc churn.
272 */
273 if (mdsc->caps_avail_count >= mdsc->caps_reserve_count +
274 mdsc->caps_min_count) {
275 mdsc->caps_total_count--;
276 kmem_cache_free(ceph_cap_cachep, cap);
277 } else {
278 mdsc->caps_avail_count++;
279 list_add(&cap->caps_item, &mdsc->caps_list);
280 }
281
282 BUG_ON(mdsc->caps_total_count != mdsc->caps_use_count +
283 mdsc->caps_reserve_count + mdsc->caps_avail_count);
284 spin_unlock(&mdsc->caps_list_lock);
285}
286
287void ceph_reservation_status(struct ceph_fs_client *fsc,
288 int *total, int *avail, int *used, int *reserved,
289 int *min)
290{
291 struct ceph_mds_client *mdsc = fsc->mdsc;
292
293 if (total)
294 *total = mdsc->caps_total_count;
295 if (avail)
296 *avail = mdsc->caps_avail_count;
297 if (used)
298 *used = mdsc->caps_use_count;
299 if (reserved)
300 *reserved = mdsc->caps_reserve_count;
301 if (min)
302 *min = mdsc->caps_min_count;
303}
304
305/*
306 * Find ceph_cap for given mds, if any.
307 *
308 * Called with i_ceph_lock held.
309 */
310static struct ceph_cap *__get_cap_for_mds(struct ceph_inode_info *ci, int mds)
311{
312 struct ceph_cap *cap;
313 struct rb_node *n = ci->i_caps.rb_node;
314
315 while (n) {
316 cap = rb_entry(n, struct ceph_cap, ci_node);
317 if (mds < cap->mds)
318 n = n->rb_left;
319 else if (mds > cap->mds)
320 n = n->rb_right;
321 else
322 return cap;
323 }
324 return NULL;
325}
326
327struct ceph_cap *ceph_get_cap_for_mds(struct ceph_inode_info *ci, int mds)
328{
329 struct ceph_cap *cap;
330
331 spin_lock(&ci->i_ceph_lock);
332 cap = __get_cap_for_mds(ci, mds);
333 spin_unlock(&ci->i_ceph_lock);
334 return cap;
335}
336
337/*
338 * Return id of any MDS with a cap, preferably FILE_WR|BUFFER|EXCL, else -1.
339 */
340static int __ceph_get_cap_mds(struct ceph_inode_info *ci)
341{
342 struct ceph_cap *cap;
343 int mds = -1;
344 struct rb_node *p;
345
346 /* prefer mds with WR|BUFFER|EXCL caps */
347 for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
348 cap = rb_entry(p, struct ceph_cap, ci_node);
349 mds = cap->mds;
350 if (cap->issued & (CEPH_CAP_FILE_WR |
351 CEPH_CAP_FILE_BUFFER |
352 CEPH_CAP_FILE_EXCL))
353 break;
354 }
355 return mds;
356}
357
358int ceph_get_cap_mds(struct inode *inode)
359{
360 struct ceph_inode_info *ci = ceph_inode(inode);
361 int mds;
362 spin_lock(&ci->i_ceph_lock);
363 mds = __ceph_get_cap_mds(ceph_inode(inode));
364 spin_unlock(&ci->i_ceph_lock);
365 return mds;
366}
367
368/*
369 * Called under i_ceph_lock.
370 */
371static void __insert_cap_node(struct ceph_inode_info *ci,
372 struct ceph_cap *new)
373{
374 struct rb_node **p = &ci->i_caps.rb_node;
375 struct rb_node *parent = NULL;
376 struct ceph_cap *cap = NULL;
377
378 while (*p) {
379 parent = *p;
380 cap = rb_entry(parent, struct ceph_cap, ci_node);
381 if (new->mds < cap->mds)
382 p = &(*p)->rb_left;
383 else if (new->mds > cap->mds)
384 p = &(*p)->rb_right;
385 else
386 BUG();
387 }
388
389 rb_link_node(&new->ci_node, parent, p);
390 rb_insert_color(&new->ci_node, &ci->i_caps);
391}
392
393/*
394 * (re)set cap hold timeouts, which control the delayed release
395 * of unused caps back to the MDS. Should be called on cap use.
396 */
397static void __cap_set_timeouts(struct ceph_mds_client *mdsc,
398 struct ceph_inode_info *ci)
399{
400 struct ceph_mount_options *ma = mdsc->fsc->mount_options;
401
402 ci->i_hold_caps_min = round_jiffies(jiffies +
403 ma->caps_wanted_delay_min * HZ);
404 ci->i_hold_caps_max = round_jiffies(jiffies +
405 ma->caps_wanted_delay_max * HZ);
406 dout("__cap_set_timeouts %p min %lu max %lu\n", &ci->vfs_inode,
407 ci->i_hold_caps_min - jiffies, ci->i_hold_caps_max - jiffies);
408}
409
410/*
411 * (Re)queue cap at the end of the delayed cap release list.
412 *
413 * If I_FLUSH is set, leave the inode at the front of the list.
414 *
415 * Caller holds i_ceph_lock
416 * -> we take mdsc->cap_delay_lock
417 */
418static void __cap_delay_requeue(struct ceph_mds_client *mdsc,
419 struct ceph_inode_info *ci)
420{
421 __cap_set_timeouts(mdsc, ci);
422 dout("__cap_delay_requeue %p flags %d at %lu\n", &ci->vfs_inode,
423 ci->i_ceph_flags, ci->i_hold_caps_max);
424 if (!mdsc->stopping) {
425 spin_lock(&mdsc->cap_delay_lock);
426 if (!list_empty(&ci->i_cap_delay_list)) {
427 if (ci->i_ceph_flags & CEPH_I_FLUSH)
428 goto no_change;
429 list_del_init(&ci->i_cap_delay_list);
430 }
431 list_add_tail(&ci->i_cap_delay_list, &mdsc->cap_delay_list);
432no_change:
433 spin_unlock(&mdsc->cap_delay_lock);
434 }
435}
436
437/*
438 * Queue an inode for immediate writeback. Mark inode with I_FLUSH,
439 * indicating we should send a cap message to flush dirty metadata
440 * asap, and move to the front of the delayed cap list.
441 */
442static void __cap_delay_requeue_front(struct ceph_mds_client *mdsc,
443 struct ceph_inode_info *ci)
444{
445 dout("__cap_delay_requeue_front %p\n", &ci->vfs_inode);
446 spin_lock(&mdsc->cap_delay_lock);
447 ci->i_ceph_flags |= CEPH_I_FLUSH;
448 if (!list_empty(&ci->i_cap_delay_list))
449 list_del_init(&ci->i_cap_delay_list);
450 list_add(&ci->i_cap_delay_list, &mdsc->cap_delay_list);
451 spin_unlock(&mdsc->cap_delay_lock);
452}
453
454/*
455 * Cancel delayed work on cap.
456 *
457 * Caller must hold i_ceph_lock.
458 */
459static void __cap_delay_cancel(struct ceph_mds_client *mdsc,
460 struct ceph_inode_info *ci)
461{
462 dout("__cap_delay_cancel %p\n", &ci->vfs_inode);
463 if (list_empty(&ci->i_cap_delay_list))
464 return;
465 spin_lock(&mdsc->cap_delay_lock);
466 list_del_init(&ci->i_cap_delay_list);
467 spin_unlock(&mdsc->cap_delay_lock);
468}
469
470/*
471 * Common issue checks for add_cap, handle_cap_grant.
472 */
473static void __check_cap_issue(struct ceph_inode_info *ci, struct ceph_cap *cap,
474 unsigned issued)
475{
476 unsigned had = __ceph_caps_issued(ci, NULL);
477
478 /*
479 * Each time we receive FILE_CACHE anew, we increment
480 * i_rdcache_gen.
481 */
482 if ((issued & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) &&
483 (had & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) == 0) {
484 ci->i_rdcache_gen++;
485 }
486
487 /*
488 * if we are newly issued FILE_SHARED, mark dir not complete; we
489 * don't know what happened to this directory while we didn't
490 * have the cap.
491 */
492 if ((issued & CEPH_CAP_FILE_SHARED) &&
493 (had & CEPH_CAP_FILE_SHARED) == 0) {
494 ci->i_shared_gen++;
495 if (S_ISDIR(ci->vfs_inode.i_mode)) {
496 dout(" marking %p NOT complete\n", &ci->vfs_inode);
497 __ceph_dir_clear_complete(ci);
498 }
499 }
500}
501
502/*
503 * Add a capability under the given MDS session.
504 *
505 * Caller should hold session snap_rwsem (read) and s_mutex.
506 *
507 * @fmode is the open file mode, if we are opening a file, otherwise
508 * it is < 0. (This is so we can atomically add the cap and add an
509 * open file reference to it.)
510 */
511int ceph_add_cap(struct inode *inode,
512 struct ceph_mds_session *session, u64 cap_id,
513 int fmode, unsigned issued, unsigned wanted,
514 unsigned seq, unsigned mseq, u64 realmino, int flags,
515 struct ceph_cap_reservation *caps_reservation)
516{
517 struct ceph_mds_client *mdsc = ceph_inode_to_client(inode)->mdsc;
518 struct ceph_inode_info *ci = ceph_inode(inode);
519 struct ceph_cap *new_cap = NULL;
520 struct ceph_cap *cap;
521 int mds = session->s_mds;
522 int actual_wanted;
523
524 dout("add_cap %p mds%d cap %llx %s seq %d\n", inode,
525 session->s_mds, cap_id, ceph_cap_string(issued), seq);
526
527 /*
528 * If we are opening the file, include file mode wanted bits
529 * in wanted.
530 */
531 if (fmode >= 0)
532 wanted |= ceph_caps_for_mode(fmode);
533
534retry:
535 spin_lock(&ci->i_ceph_lock);
536 cap = __get_cap_for_mds(ci, mds);
537 if (!cap) {
538 if (new_cap) {
539 cap = new_cap;
540 new_cap = NULL;
541 } else {
542 spin_unlock(&ci->i_ceph_lock);
543 new_cap = get_cap(mdsc, caps_reservation);
544 if (new_cap == NULL)
545 return -ENOMEM;
546 goto retry;
547 }
548
549 cap->issued = 0;
550 cap->implemented = 0;
551 cap->mds = mds;
552 cap->mds_wanted = 0;
553 cap->mseq = 0;
554
555 cap->ci = ci;
556 __insert_cap_node(ci, cap);
557
558 /* add to session cap list */
559 cap->session = session;
560 spin_lock(&session->s_cap_lock);
561 list_add_tail(&cap->session_caps, &session->s_caps);
562 session->s_nr_caps++;
563 spin_unlock(&session->s_cap_lock);
564 } else {
565 if (new_cap)
566 ceph_put_cap(mdsc, new_cap);
567
568 /*
569 * auth mds of the inode changed. we received the cap export
570 * message, but still haven't received the cap import message.
571 * handle_cap_export() updated the new auth MDS' cap.
572 *
573 * "ceph_seq_cmp(seq, cap->seq) <= 0" means we are processing
574 * a message that was send before the cap import message. So
575 * don't remove caps.
576 */
577 if (ceph_seq_cmp(seq, cap->seq) <= 0) {
578 WARN_ON(cap != ci->i_auth_cap);
579 WARN_ON(cap->cap_id != cap_id);
580 seq = cap->seq;
581 mseq = cap->mseq;
582 issued |= cap->issued;
583 flags |= CEPH_CAP_FLAG_AUTH;
584 }
585 }
586
587 if (!ci->i_snap_realm) {
588 /*
589 * add this inode to the appropriate snap realm
590 */
591 struct ceph_snap_realm *realm = ceph_lookup_snap_realm(mdsc,
592 realmino);
593 if (realm) {
594 ceph_get_snap_realm(mdsc, realm);
595 spin_lock(&realm->inodes_with_caps_lock);
596 ci->i_snap_realm = realm;
597 list_add(&ci->i_snap_realm_item,
598 &realm->inodes_with_caps);
599 spin_unlock(&realm->inodes_with_caps_lock);
600 } else {
601 pr_err("ceph_add_cap: couldn't find snap realm %llx\n",
602 realmino);
603 WARN_ON(!realm);
604 }
605 }
606
607 __check_cap_issue(ci, cap, issued);
608
609 /*
610 * If we are issued caps we don't want, or the mds' wanted
611 * value appears to be off, queue a check so we'll release
612 * later and/or update the mds wanted value.
613 */
614 actual_wanted = __ceph_caps_wanted(ci);
615 if ((wanted & ~actual_wanted) ||
616 (issued & ~actual_wanted & CEPH_CAP_ANY_WR)) {
617 dout(" issued %s, mds wanted %s, actual %s, queueing\n",
618 ceph_cap_string(issued), ceph_cap_string(wanted),
619 ceph_cap_string(actual_wanted));
620 __cap_delay_requeue(mdsc, ci);
621 }
622
623 if (flags & CEPH_CAP_FLAG_AUTH) {
624 if (ci->i_auth_cap == NULL ||
625 ceph_seq_cmp(ci->i_auth_cap->mseq, mseq) < 0) {
626 ci->i_auth_cap = cap;
627 cap->mds_wanted = wanted;
628 }
629 ci->i_cap_exporting_issued = 0;
630 } else {
631 WARN_ON(ci->i_auth_cap == cap);
632 }
633
634 dout("add_cap inode %p (%llx.%llx) cap %p %s now %s seq %d mds%d\n",
635 inode, ceph_vinop(inode), cap, ceph_cap_string(issued),
636 ceph_cap_string(issued|cap->issued), seq, mds);
637 cap->cap_id = cap_id;
638 cap->issued = issued;
639 cap->implemented |= issued;
640 if (ceph_seq_cmp(mseq, cap->mseq) > 0)
641 cap->mds_wanted = wanted;
642 else
643 cap->mds_wanted |= wanted;
644 cap->seq = seq;
645 cap->issue_seq = seq;
646 cap->mseq = mseq;
647 cap->cap_gen = session->s_cap_gen;
648
649 if (fmode >= 0)
650 __ceph_get_fmode(ci, fmode);
651 spin_unlock(&ci->i_ceph_lock);
652 wake_up_all(&ci->i_cap_wq);
653 return 0;
654}
655
656/*
657 * Return true if cap has not timed out and belongs to the current
658 * generation of the MDS session (i.e. has not gone 'stale' due to
659 * us losing touch with the mds).
660 */
661static int __cap_is_valid(struct ceph_cap *cap)
662{
663 unsigned long ttl;
664 u32 gen;
665
666 spin_lock(&cap->session->s_gen_ttl_lock);
667 gen = cap->session->s_cap_gen;
668 ttl = cap->session->s_cap_ttl;
669 spin_unlock(&cap->session->s_gen_ttl_lock);
670
671 if (cap->cap_gen < gen || time_after_eq(jiffies, ttl)) {
672 dout("__cap_is_valid %p cap %p issued %s "
673 "but STALE (gen %u vs %u)\n", &cap->ci->vfs_inode,
674 cap, ceph_cap_string(cap->issued), cap->cap_gen, gen);
675 return 0;
676 }
677
678 return 1;
679}
680
681/*
682 * Return set of valid cap bits issued to us. Note that caps time
683 * out, and may be invalidated in bulk if the client session times out
684 * and session->s_cap_gen is bumped.
685 */
686int __ceph_caps_issued(struct ceph_inode_info *ci, int *implemented)
687{
688 int have = ci->i_snap_caps | ci->i_cap_exporting_issued;
689 struct ceph_cap *cap;
690 struct rb_node *p;
691
692 if (implemented)
693 *implemented = 0;
694 for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
695 cap = rb_entry(p, struct ceph_cap, ci_node);
696 if (!__cap_is_valid(cap))
697 continue;
698 dout("__ceph_caps_issued %p cap %p issued %s\n",
699 &ci->vfs_inode, cap, ceph_cap_string(cap->issued));
700 have |= cap->issued;
701 if (implemented)
702 *implemented |= cap->implemented;
703 }
704 /*
705 * exclude caps issued by non-auth MDS, but are been revoking
706 * by the auth MDS. The non-auth MDS should be revoking/exporting
707 * these caps, but the message is delayed.
708 */
709 if (ci->i_auth_cap) {
710 cap = ci->i_auth_cap;
711 have &= ~cap->implemented | cap->issued;
712 }
713 return have;
714}
715
716/*
717 * Get cap bits issued by caps other than @ocap
718 */
719int __ceph_caps_issued_other(struct ceph_inode_info *ci, struct ceph_cap *ocap)
720{
721 int have = ci->i_snap_caps;
722 struct ceph_cap *cap;
723 struct rb_node *p;
724
725 for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
726 cap = rb_entry(p, struct ceph_cap, ci_node);
727 if (cap == ocap)
728 continue;
729 if (!__cap_is_valid(cap))
730 continue;
731 have |= cap->issued;
732 }
733 return have;
734}
735
736/*
737 * Move a cap to the end of the LRU (oldest caps at list head, newest
738 * at list tail).
739 */
740static void __touch_cap(struct ceph_cap *cap)
741{
742 struct ceph_mds_session *s = cap->session;
743
744 spin_lock(&s->s_cap_lock);
745 if (s->s_cap_iterator == NULL) {
746 dout("__touch_cap %p cap %p mds%d\n", &cap->ci->vfs_inode, cap,
747 s->s_mds);
748 list_move_tail(&cap->session_caps, &s->s_caps);
749 } else {
750 dout("__touch_cap %p cap %p mds%d NOP, iterating over caps\n",
751 &cap->ci->vfs_inode, cap, s->s_mds);
752 }
753 spin_unlock(&s->s_cap_lock);
754}
755
756/*
757 * Check if we hold the given mask. If so, move the cap(s) to the
758 * front of their respective LRUs. (This is the preferred way for
759 * callers to check for caps they want.)
760 */
761int __ceph_caps_issued_mask(struct ceph_inode_info *ci, int mask, int touch)
762{
763 struct ceph_cap *cap;
764 struct rb_node *p;
765 int have = ci->i_snap_caps;
766
767 if ((have & mask) == mask) {
768 dout("__ceph_caps_issued_mask %p snap issued %s"
769 " (mask %s)\n", &ci->vfs_inode,
770 ceph_cap_string(have),
771 ceph_cap_string(mask));
772 return 1;
773 }
774
775 for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
776 cap = rb_entry(p, struct ceph_cap, ci_node);
777 if (!__cap_is_valid(cap))
778 continue;
779 if ((cap->issued & mask) == mask) {
780 dout("__ceph_caps_issued_mask %p cap %p issued %s"
781 " (mask %s)\n", &ci->vfs_inode, cap,
782 ceph_cap_string(cap->issued),
783 ceph_cap_string(mask));
784 if (touch)
785 __touch_cap(cap);
786 return 1;
787 }
788
789 /* does a combination of caps satisfy mask? */
790 have |= cap->issued;
791 if ((have & mask) == mask) {
792 dout("__ceph_caps_issued_mask %p combo issued %s"
793 " (mask %s)\n", &ci->vfs_inode,
794 ceph_cap_string(cap->issued),
795 ceph_cap_string(mask));
796 if (touch) {
797 struct rb_node *q;
798
799 /* touch this + preceding caps */
800 __touch_cap(cap);
801 for (q = rb_first(&ci->i_caps); q != p;
802 q = rb_next(q)) {
803 cap = rb_entry(q, struct ceph_cap,
804 ci_node);
805 if (!__cap_is_valid(cap))
806 continue;
807 __touch_cap(cap);
808 }
809 }
810 return 1;
811 }
812 }
813
814 return 0;
815}
816
817/*
818 * Return true if mask caps are currently being revoked by an MDS.
819 */
820int __ceph_caps_revoking_other(struct ceph_inode_info *ci,
821 struct ceph_cap *ocap, int mask)
822{
823 struct ceph_cap *cap;
824 struct rb_node *p;
825
826 for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
827 cap = rb_entry(p, struct ceph_cap, ci_node);
828 if (cap != ocap &&
829 (cap->implemented & ~cap->issued & mask))
830 return 1;
831 }
832 return 0;
833}
834
835int ceph_caps_revoking(struct ceph_inode_info *ci, int mask)
836{
837 struct inode *inode = &ci->vfs_inode;
838 int ret;
839
840 spin_lock(&ci->i_ceph_lock);
841 ret = __ceph_caps_revoking_other(ci, NULL, mask);
842 spin_unlock(&ci->i_ceph_lock);
843 dout("ceph_caps_revoking %p %s = %d\n", inode,
844 ceph_cap_string(mask), ret);
845 return ret;
846}
847
848int __ceph_caps_used(struct ceph_inode_info *ci)
849{
850 int used = 0;
851 if (ci->i_pin_ref)
852 used |= CEPH_CAP_PIN;
853 if (ci->i_rd_ref)
854 used |= CEPH_CAP_FILE_RD;
855 if (ci->i_rdcache_ref || ci->vfs_inode.i_data.nrpages)
856 used |= CEPH_CAP_FILE_CACHE;
857 if (ci->i_wr_ref)
858 used |= CEPH_CAP_FILE_WR;
859 if (ci->i_wb_ref || ci->i_wrbuffer_ref)
860 used |= CEPH_CAP_FILE_BUFFER;
861 return used;
862}
863
864/*
865 * wanted, by virtue of open file modes
866 */
867int __ceph_caps_file_wanted(struct ceph_inode_info *ci)
868{
869 int want = 0;
870 int mode;
871 for (mode = 0; mode < CEPH_FILE_MODE_NUM; mode++)
872 if (ci->i_nr_by_mode[mode])
873 want |= ceph_caps_for_mode(mode);
874 return want;
875}
876
877/*
878 * Return caps we have registered with the MDS(s) as 'wanted'.
879 */
880int __ceph_caps_mds_wanted(struct ceph_inode_info *ci)
881{
882 struct ceph_cap *cap;
883 struct rb_node *p;
884 int mds_wanted = 0;
885
886 for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
887 cap = rb_entry(p, struct ceph_cap, ci_node);
888 if (!__cap_is_valid(cap))
889 continue;
890 if (cap == ci->i_auth_cap)
891 mds_wanted |= cap->mds_wanted;
892 else
893 mds_wanted |= (cap->mds_wanted & ~CEPH_CAP_ANY_FILE_WR);
894 }
895 return mds_wanted;
896}
897
898/*
899 * called under i_ceph_lock
900 */
901static int __ceph_is_any_caps(struct ceph_inode_info *ci)
902{
903 return !RB_EMPTY_ROOT(&ci->i_caps) || ci->i_cap_exporting_issued;
904}
905
906int ceph_is_any_caps(struct inode *inode)
907{
908 struct ceph_inode_info *ci = ceph_inode(inode);
909 int ret;
910
911 spin_lock(&ci->i_ceph_lock);
912 ret = __ceph_is_any_caps(ci);
913 spin_unlock(&ci->i_ceph_lock);
914
915 return ret;
916}
917
918/*
919 * Remove a cap. Take steps to deal with a racing iterate_session_caps.
920 *
921 * caller should hold i_ceph_lock.
922 * caller will not hold session s_mutex if called from destroy_inode.
923 */
924void __ceph_remove_cap(struct ceph_cap *cap, bool queue_release)
925{
926 struct ceph_mds_session *session = cap->session;
927 struct ceph_inode_info *ci = cap->ci;
928 struct ceph_mds_client *mdsc =
929 ceph_sb_to_client(ci->vfs_inode.i_sb)->mdsc;
930 int removed = 0;
931
932 dout("__ceph_remove_cap %p from %p\n", cap, &ci->vfs_inode);
933
934 /* remove from session list */
935 spin_lock(&session->s_cap_lock);
936 /*
937 * s_cap_reconnect is protected by s_cap_lock. no one changes
938 * s_cap_gen while session is in the reconnect state.
939 */
940 if (queue_release &&
941 (!session->s_cap_reconnect ||
942 cap->cap_gen == session->s_cap_gen))
943 __queue_cap_release(session, ci->i_vino.ino, cap->cap_id,
944 cap->mseq, cap->issue_seq);
945
946 if (session->s_cap_iterator == cap) {
947 /* not yet, we are iterating over this very cap */
948 dout("__ceph_remove_cap delaying %p removal from session %p\n",
949 cap, cap->session);
950 } else {
951 list_del_init(&cap->session_caps);
952 session->s_nr_caps--;
953 cap->session = NULL;
954 removed = 1;
955 }
956 /* protect backpointer with s_cap_lock: see iterate_session_caps */
957 cap->ci = NULL;
958 spin_unlock(&session->s_cap_lock);
959
960 /* remove from inode list */
961 rb_erase(&cap->ci_node, &ci->i_caps);
962 if (ci->i_auth_cap == cap)
963 ci->i_auth_cap = NULL;
964
965 if (removed)
966 ceph_put_cap(mdsc, cap);
967
968 if (!__ceph_is_any_caps(ci) && ci->i_snap_realm) {
969 struct ceph_snap_realm *realm = ci->i_snap_realm;
970 spin_lock(&realm->inodes_with_caps_lock);
971 list_del_init(&ci->i_snap_realm_item);
972 ci->i_snap_realm_counter++;
973 ci->i_snap_realm = NULL;
974 spin_unlock(&realm->inodes_with_caps_lock);
975 ceph_put_snap_realm(mdsc, realm);
976 }
977 if (!__ceph_is_any_real_caps(ci))
978 __cap_delay_cancel(mdsc, ci);
979}
980
981/*
982 * Build and send a cap message to the given MDS.
983 *
984 * Caller should be holding s_mutex.
985 */
986static int send_cap_msg(struct ceph_mds_session *session,
987 u64 ino, u64 cid, int op,
988 int caps, int wanted, int dirty,
989 u32 seq, u64 flush_tid, u32 issue_seq, u32 mseq,
990 u64 size, u64 max_size,
991 struct timespec *mtime, struct timespec *atime,
992 u64 time_warp_seq,
993 kuid_t uid, kgid_t gid, umode_t mode,
994 u64 xattr_version,
995 struct ceph_buffer *xattrs_buf,
996 u64 follows)
997{
998 struct ceph_mds_caps *fc;
999 struct ceph_msg *msg;
1000
1001 dout("send_cap_msg %s %llx %llx caps %s wanted %s dirty %s"
1002 " seq %u/%u mseq %u follows %lld size %llu/%llu"
1003 " xattr_ver %llu xattr_len %d\n", ceph_cap_op_name(op),
1004 cid, ino, ceph_cap_string(caps), ceph_cap_string(wanted),
1005 ceph_cap_string(dirty),
1006 seq, issue_seq, mseq, follows, size, max_size,
1007 xattr_version, xattrs_buf ? (int)xattrs_buf->vec.iov_len : 0);
1008
1009 msg = ceph_msg_new(CEPH_MSG_CLIENT_CAPS, sizeof(*fc), GFP_NOFS, false);
1010 if (!msg)
1011 return -ENOMEM;
1012
1013 msg->hdr.tid = cpu_to_le64(flush_tid);
1014
1015 fc = msg->front.iov_base;
1016 memset(fc, 0, sizeof(*fc));
1017
1018 fc->cap_id = cpu_to_le64(cid);
1019 fc->op = cpu_to_le32(op);
1020 fc->seq = cpu_to_le32(seq);
1021 fc->issue_seq = cpu_to_le32(issue_seq);
1022 fc->migrate_seq = cpu_to_le32(mseq);
1023 fc->caps = cpu_to_le32(caps);
1024 fc->wanted = cpu_to_le32(wanted);
1025 fc->dirty = cpu_to_le32(dirty);
1026 fc->ino = cpu_to_le64(ino);
1027 fc->snap_follows = cpu_to_le64(follows);
1028
1029 fc->size = cpu_to_le64(size);
1030 fc->max_size = cpu_to_le64(max_size);
1031 if (mtime)
1032 ceph_encode_timespec(&fc->mtime, mtime);
1033 if (atime)
1034 ceph_encode_timespec(&fc->atime, atime);
1035 fc->time_warp_seq = cpu_to_le32(time_warp_seq);
1036
1037 fc->uid = cpu_to_le32(from_kuid(&init_user_ns, uid));
1038 fc->gid = cpu_to_le32(from_kgid(&init_user_ns, gid));
1039 fc->mode = cpu_to_le32(mode);
1040
1041 fc->xattr_version = cpu_to_le64(xattr_version);
1042 if (xattrs_buf) {
1043 msg->middle = ceph_buffer_get(xattrs_buf);
1044 fc->xattr_len = cpu_to_le32(xattrs_buf->vec.iov_len);
1045 msg->hdr.middle_len = cpu_to_le32(xattrs_buf->vec.iov_len);
1046 }
1047
1048 ceph_con_send(&session->s_con, msg);
1049 return 0;
1050}
1051
1052void __queue_cap_release(struct ceph_mds_session *session,
1053 u64 ino, u64 cap_id, u32 migrate_seq,
1054 u32 issue_seq)
1055{
1056 struct ceph_msg *msg;
1057 struct ceph_mds_cap_release *head;
1058 struct ceph_mds_cap_item *item;
1059
1060 BUG_ON(!session->s_num_cap_releases);
1061 msg = list_first_entry(&session->s_cap_releases,
1062 struct ceph_msg, list_head);
1063
1064 dout(" adding %llx release to mds%d msg %p (%d left)\n",
1065 ino, session->s_mds, msg, session->s_num_cap_releases);
1066
1067 BUG_ON(msg->front.iov_len + sizeof(*item) > PAGE_CACHE_SIZE);
1068 head = msg->front.iov_base;
1069 le32_add_cpu(&head->num, 1);
1070 item = msg->front.iov_base + msg->front.iov_len;
1071 item->ino = cpu_to_le64(ino);
1072 item->cap_id = cpu_to_le64(cap_id);
1073 item->migrate_seq = cpu_to_le32(migrate_seq);
1074 item->seq = cpu_to_le32(issue_seq);
1075
1076 session->s_num_cap_releases--;
1077
1078 msg->front.iov_len += sizeof(*item);
1079 if (le32_to_cpu(head->num) == CEPH_CAPS_PER_RELEASE) {
1080 dout(" release msg %p full\n", msg);
1081 list_move_tail(&msg->list_head, &session->s_cap_releases_done);
1082 } else {
1083 dout(" release msg %p at %d/%d (%d)\n", msg,
1084 (int)le32_to_cpu(head->num),
1085 (int)CEPH_CAPS_PER_RELEASE,
1086 (int)msg->front.iov_len);
1087 }
1088}
1089
1090/*
1091 * Queue cap releases when an inode is dropped from our cache. Since
1092 * inode is about to be destroyed, there is no need for i_ceph_lock.
1093 */
1094void ceph_queue_caps_release(struct inode *inode)
1095{
1096 struct ceph_inode_info *ci = ceph_inode(inode);
1097 struct rb_node *p;
1098
1099 p = rb_first(&ci->i_caps);
1100 while (p) {
1101 struct ceph_cap *cap = rb_entry(p, struct ceph_cap, ci_node);
1102 p = rb_next(p);
1103 __ceph_remove_cap(cap, true);
1104 }
1105}
1106
1107/*
1108 * Send a cap msg on the given inode. Update our caps state, then
1109 * drop i_ceph_lock and send the message.
1110 *
1111 * Make note of max_size reported/requested from mds, revoked caps
1112 * that have now been implemented.
1113 *
1114 * Make half-hearted attempt ot to invalidate page cache if we are
1115 * dropping RDCACHE. Note that this will leave behind locked pages
1116 * that we'll then need to deal with elsewhere.
1117 *
1118 * Return non-zero if delayed release, or we experienced an error
1119 * such that the caller should requeue + retry later.
1120 *
1121 * called with i_ceph_lock, then drops it.
1122 * caller should hold snap_rwsem (read), s_mutex.
1123 */
1124static int __send_cap(struct ceph_mds_client *mdsc, struct ceph_cap *cap,
1125 int op, int used, int want, int retain, int flushing,
1126 unsigned *pflush_tid)
1127 __releases(cap->ci->i_ceph_lock)
1128{
1129 struct ceph_inode_info *ci = cap->ci;
1130 struct inode *inode = &ci->vfs_inode;
1131 u64 cap_id = cap->cap_id;
1132 int held, revoking, dropping, keep;
1133 u64 seq, issue_seq, mseq, time_warp_seq, follows;
1134 u64 size, max_size;
1135 struct timespec mtime, atime;
1136 int wake = 0;
1137 umode_t mode;
1138 kuid_t uid;
1139 kgid_t gid;
1140 struct ceph_mds_session *session;
1141 u64 xattr_version = 0;
1142 struct ceph_buffer *xattr_blob = NULL;
1143 int delayed = 0;
1144 u64 flush_tid = 0;
1145 int i;
1146 int ret;
1147
1148 held = cap->issued | cap->implemented;
1149 revoking = cap->implemented & ~cap->issued;
1150 retain &= ~revoking;
1151 dropping = cap->issued & ~retain;
1152
1153 dout("__send_cap %p cap %p session %p %s -> %s (revoking %s)\n",
1154 inode, cap, cap->session,
1155 ceph_cap_string(held), ceph_cap_string(held & retain),
1156 ceph_cap_string(revoking));
1157 BUG_ON((retain & CEPH_CAP_PIN) == 0);
1158
1159 session = cap->session;
1160
1161 /* don't release wanted unless we've waited a bit. */
1162 if ((ci->i_ceph_flags & CEPH_I_NODELAY) == 0 &&
1163 time_before(jiffies, ci->i_hold_caps_min)) {
1164 dout(" delaying issued %s -> %s, wanted %s -> %s on send\n",
1165 ceph_cap_string(cap->issued),
1166 ceph_cap_string(cap->issued & retain),
1167 ceph_cap_string(cap->mds_wanted),
1168 ceph_cap_string(want));
1169 want |= cap->mds_wanted;
1170 retain |= cap->issued;
1171 delayed = 1;
1172 }
1173 ci->i_ceph_flags &= ~(CEPH_I_NODELAY | CEPH_I_FLUSH);
1174
1175 cap->issued &= retain; /* drop bits we don't want */
1176 if (cap->implemented & ~cap->issued) {
1177 /*
1178 * Wake up any waiters on wanted -> needed transition.
1179 * This is due to the weird transition from buffered
1180 * to sync IO... we need to flush dirty pages _before_
1181 * allowing sync writes to avoid reordering.
1182 */
1183 wake = 1;
1184 }
1185 cap->implemented &= cap->issued | used;
1186 cap->mds_wanted = want;
1187
1188 if (flushing) {
1189 /*
1190 * assign a tid for flush operations so we can avoid
1191 * flush1 -> dirty1 -> flush2 -> flushack1 -> mark
1192 * clean type races. track latest tid for every bit
1193 * so we can handle flush AxFw, flush Fw, and have the
1194 * first ack clean Ax.
1195 */
1196 flush_tid = ++ci->i_cap_flush_last_tid;
1197 if (pflush_tid)
1198 *pflush_tid = flush_tid;
1199 dout(" cap_flush_tid %d\n", (int)flush_tid);
1200 for (i = 0; i < CEPH_CAP_BITS; i++)
1201 if (flushing & (1 << i))
1202 ci->i_cap_flush_tid[i] = flush_tid;
1203
1204 follows = ci->i_head_snapc->seq;
1205 } else {
1206 follows = 0;
1207 }
1208
1209 keep = cap->implemented;
1210 seq = cap->seq;
1211 issue_seq = cap->issue_seq;
1212 mseq = cap->mseq;
1213 size = inode->i_size;
1214 ci->i_reported_size = size;
1215 max_size = ci->i_wanted_max_size;
1216 ci->i_requested_max_size = max_size;
1217 mtime = inode->i_mtime;
1218 atime = inode->i_atime;
1219 time_warp_seq = ci->i_time_warp_seq;
1220 uid = inode->i_uid;
1221 gid = inode->i_gid;
1222 mode = inode->i_mode;
1223
1224 if (flushing & CEPH_CAP_XATTR_EXCL) {
1225 __ceph_build_xattrs_blob(ci);
1226 xattr_blob = ci->i_xattrs.blob;
1227 xattr_version = ci->i_xattrs.version;
1228 }
1229
1230 spin_unlock(&ci->i_ceph_lock);
1231
1232 ret = send_cap_msg(session, ceph_vino(inode).ino, cap_id,
1233 op, keep, want, flushing, seq, flush_tid, issue_seq, mseq,
1234 size, max_size, &mtime, &atime, time_warp_seq,
1235 uid, gid, mode, xattr_version, xattr_blob,
1236 follows);
1237 if (ret < 0) {
1238 dout("error sending cap msg, must requeue %p\n", inode);
1239 delayed = 1;
1240 }
1241
1242 if (wake)
1243 wake_up_all(&ci->i_cap_wq);
1244
1245 return delayed;
1246}
1247
1248/*
1249 * When a snapshot is taken, clients accumulate dirty metadata on
1250 * inodes with capabilities in ceph_cap_snaps to describe the file
1251 * state at the time the snapshot was taken. This must be flushed
1252 * asynchronously back to the MDS once sync writes complete and dirty
1253 * data is written out.
1254 *
1255 * Unless @again is true, skip cap_snaps that were already sent to
1256 * the MDS (i.e., during this session).
1257 *
1258 * Called under i_ceph_lock. Takes s_mutex as needed.
1259 */
1260void __ceph_flush_snaps(struct ceph_inode_info *ci,
1261 struct ceph_mds_session **psession,
1262 int again)
1263 __releases(ci->i_ceph_lock)
1264 __acquires(ci->i_ceph_lock)
1265{
1266 struct inode *inode = &ci->vfs_inode;
1267 int mds;
1268 struct ceph_cap_snap *capsnap;
1269 u32 mseq;
1270 struct ceph_mds_client *mdsc = ceph_inode_to_client(inode)->mdsc;
1271 struct ceph_mds_session *session = NULL; /* if session != NULL, we hold
1272 session->s_mutex */
1273 u64 next_follows = 0; /* keep track of how far we've gotten through the
1274 i_cap_snaps list, and skip these entries next time
1275 around to avoid an infinite loop */
1276
1277 if (psession)
1278 session = *psession;
1279
1280 dout("__flush_snaps %p\n", inode);
1281retry:
1282 list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) {
1283 /* avoid an infiniute loop after retry */
1284 if (capsnap->follows < next_follows)
1285 continue;
1286 /*
1287 * we need to wait for sync writes to complete and for dirty
1288 * pages to be written out.
1289 */
1290 if (capsnap->dirty_pages || capsnap->writing)
1291 break;
1292
1293 /*
1294 * if cap writeback already occurred, we should have dropped
1295 * the capsnap in ceph_put_wrbuffer_cap_refs.
1296 */
1297 BUG_ON(capsnap->dirty == 0);
1298
1299 /* pick mds, take s_mutex */
1300 if (ci->i_auth_cap == NULL) {
1301 dout("no auth cap (migrating?), doing nothing\n");
1302 goto out;
1303 }
1304
1305 /* only flush each capsnap once */
1306 if (!again && !list_empty(&capsnap->flushing_item)) {
1307 dout("already flushed %p, skipping\n", capsnap);
1308 continue;
1309 }
1310
1311 mds = ci->i_auth_cap->session->s_mds;
1312 mseq = ci->i_auth_cap->mseq;
1313
1314 if (session && session->s_mds != mds) {
1315 dout("oops, wrong session %p mutex\n", session);
1316 mutex_unlock(&session->s_mutex);
1317 ceph_put_mds_session(session);
1318 session = NULL;
1319 }
1320 if (!session) {
1321 spin_unlock(&ci->i_ceph_lock);
1322 mutex_lock(&mdsc->mutex);
1323 session = __ceph_lookup_mds_session(mdsc, mds);
1324 mutex_unlock(&mdsc->mutex);
1325 if (session) {
1326 dout("inverting session/ino locks on %p\n",
1327 session);
1328 mutex_lock(&session->s_mutex);
1329 }
1330 /*
1331 * if session == NULL, we raced against a cap
1332 * deletion or migration. retry, and we'll
1333 * get a better @mds value next time.
1334 */
1335 spin_lock(&ci->i_ceph_lock);
1336 goto retry;
1337 }
1338
1339 capsnap->flush_tid = ++ci->i_cap_flush_last_tid;
1340 atomic_inc(&capsnap->nref);
1341 if (!list_empty(&capsnap->flushing_item))
1342 list_del_init(&capsnap->flushing_item);
1343 list_add_tail(&capsnap->flushing_item,
1344 &session->s_cap_snaps_flushing);
1345 spin_unlock(&ci->i_ceph_lock);
1346
1347 dout("flush_snaps %p cap_snap %p follows %lld tid %llu\n",
1348 inode, capsnap, capsnap->follows, capsnap->flush_tid);
1349 send_cap_msg(session, ceph_vino(inode).ino, 0,
1350 CEPH_CAP_OP_FLUSHSNAP, capsnap->issued, 0,
1351 capsnap->dirty, 0, capsnap->flush_tid, 0, mseq,
1352 capsnap->size, 0,
1353 &capsnap->mtime, &capsnap->atime,
1354 capsnap->time_warp_seq,
1355 capsnap->uid, capsnap->gid, capsnap->mode,
1356 capsnap->xattr_version, capsnap->xattr_blob,
1357 capsnap->follows);
1358
1359 next_follows = capsnap->follows + 1;
1360 ceph_put_cap_snap(capsnap);
1361
1362 spin_lock(&ci->i_ceph_lock);
1363 goto retry;
1364 }
1365
1366 /* we flushed them all; remove this inode from the queue */
1367 spin_lock(&mdsc->snap_flush_lock);
1368 list_del_init(&ci->i_snap_flush_item);
1369 spin_unlock(&mdsc->snap_flush_lock);
1370
1371out:
1372 if (psession)
1373 *psession = session;
1374 else if (session) {
1375 mutex_unlock(&session->s_mutex);
1376 ceph_put_mds_session(session);
1377 }
1378}
1379
1380static void ceph_flush_snaps(struct ceph_inode_info *ci)
1381{
1382 spin_lock(&ci->i_ceph_lock);
1383 __ceph_flush_snaps(ci, NULL, 0);
1384 spin_unlock(&ci->i_ceph_lock);
1385}
1386
1387/*
1388 * Mark caps dirty. If inode is newly dirty, return the dirty flags.
1389 * Caller is then responsible for calling __mark_inode_dirty with the
1390 * returned flags value.
1391 */
1392int __ceph_mark_dirty_caps(struct ceph_inode_info *ci, int mask)
1393{
1394 struct ceph_mds_client *mdsc =
1395 ceph_sb_to_client(ci->vfs_inode.i_sb)->mdsc;
1396 struct inode *inode = &ci->vfs_inode;
1397 int was = ci->i_dirty_caps;
1398 int dirty = 0;
1399
1400 dout("__mark_dirty_caps %p %s dirty %s -> %s\n", &ci->vfs_inode,
1401 ceph_cap_string(mask), ceph_cap_string(was),
1402 ceph_cap_string(was | mask));
1403 ci->i_dirty_caps |= mask;
1404 if (was == 0) {
1405 if (!ci->i_head_snapc)
1406 ci->i_head_snapc = ceph_get_snap_context(
1407 ci->i_snap_realm->cached_context);
1408 dout(" inode %p now dirty snapc %p auth cap %p\n",
1409 &ci->vfs_inode, ci->i_head_snapc, ci->i_auth_cap);
1410 WARN_ON(!ci->i_auth_cap);
1411 BUG_ON(!list_empty(&ci->i_dirty_item));
1412 spin_lock(&mdsc->cap_dirty_lock);
1413 list_add(&ci->i_dirty_item, &mdsc->cap_dirty);
1414 spin_unlock(&mdsc->cap_dirty_lock);
1415 if (ci->i_flushing_caps == 0) {
1416 ihold(inode);
1417 dirty |= I_DIRTY_SYNC;
1418 }
1419 }
1420 BUG_ON(list_empty(&ci->i_dirty_item));
1421 if (((was | ci->i_flushing_caps) & CEPH_CAP_FILE_BUFFER) &&
1422 (mask & CEPH_CAP_FILE_BUFFER))
1423 dirty |= I_DIRTY_DATASYNC;
1424 __cap_delay_requeue(mdsc, ci);
1425 return dirty;
1426}
1427
1428/*
1429 * Add dirty inode to the flushing list. Assigned a seq number so we
1430 * can wait for caps to flush without starving.
1431 *
1432 * Called under i_ceph_lock.
1433 */
1434static int __mark_caps_flushing(struct inode *inode,
1435 struct ceph_mds_session *session)
1436{
1437 struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
1438 struct ceph_inode_info *ci = ceph_inode(inode);
1439 int flushing;
1440
1441 BUG_ON(ci->i_dirty_caps == 0);
1442 BUG_ON(list_empty(&ci->i_dirty_item));
1443
1444 flushing = ci->i_dirty_caps;
1445 dout("__mark_caps_flushing flushing %s, flushing_caps %s -> %s\n",
1446 ceph_cap_string(flushing),
1447 ceph_cap_string(ci->i_flushing_caps),
1448 ceph_cap_string(ci->i_flushing_caps | flushing));
1449 ci->i_flushing_caps |= flushing;
1450 ci->i_dirty_caps = 0;
1451 dout(" inode %p now !dirty\n", inode);
1452
1453 spin_lock(&mdsc->cap_dirty_lock);
1454 list_del_init(&ci->i_dirty_item);
1455
1456 ci->i_cap_flush_seq = ++mdsc->cap_flush_seq;
1457 if (list_empty(&ci->i_flushing_item)) {
1458 list_add_tail(&ci->i_flushing_item, &session->s_cap_flushing);
1459 mdsc->num_cap_flushing++;
1460 dout(" inode %p now flushing seq %lld\n", inode,
1461 ci->i_cap_flush_seq);
1462 } else {
1463 list_move_tail(&ci->i_flushing_item, &session->s_cap_flushing);
1464 dout(" inode %p now flushing (more) seq %lld\n", inode,
1465 ci->i_cap_flush_seq);
1466 }
1467 spin_unlock(&mdsc->cap_dirty_lock);
1468
1469 return flushing;
1470}
1471
1472/*
1473 * try to invalidate mapping pages without blocking.
1474 */
1475static int try_nonblocking_invalidate(struct inode *inode)
1476{
1477 struct ceph_inode_info *ci = ceph_inode(inode);
1478 u32 invalidating_gen = ci->i_rdcache_gen;
1479
1480 spin_unlock(&ci->i_ceph_lock);
1481 invalidate_mapping_pages(&inode->i_data, 0, -1);
1482 spin_lock(&ci->i_ceph_lock);
1483
1484 if (inode->i_data.nrpages == 0 &&
1485 invalidating_gen == ci->i_rdcache_gen) {
1486 /* success. */
1487 dout("try_nonblocking_invalidate %p success\n", inode);
1488 /* save any racing async invalidate some trouble */
1489 ci->i_rdcache_revoking = ci->i_rdcache_gen - 1;
1490 return 0;
1491 }
1492 dout("try_nonblocking_invalidate %p failed\n", inode);
1493 return -1;
1494}
1495
1496/*
1497 * Swiss army knife function to examine currently used and wanted
1498 * versus held caps. Release, flush, ack revoked caps to mds as
1499 * appropriate.
1500 *
1501 * CHECK_CAPS_NODELAY - caller is delayed work and we should not delay
1502 * cap release further.
1503 * CHECK_CAPS_AUTHONLY - we should only check the auth cap
1504 * CHECK_CAPS_FLUSH - we should flush any dirty caps immediately, without
1505 * further delay.
1506 */
1507void ceph_check_caps(struct ceph_inode_info *ci, int flags,
1508 struct ceph_mds_session *session)
1509{
1510 struct ceph_fs_client *fsc = ceph_inode_to_client(&ci->vfs_inode);
1511 struct ceph_mds_client *mdsc = fsc->mdsc;
1512 struct inode *inode = &ci->vfs_inode;
1513 struct ceph_cap *cap;
1514 int file_wanted, used, cap_used;
1515 int took_snap_rwsem = 0; /* true if mdsc->snap_rwsem held */
1516 int issued, implemented, want, retain, revoking, flushing = 0;
1517 int mds = -1; /* keep track of how far we've gone through i_caps list
1518 to avoid an infinite loop on retry */
1519 struct rb_node *p;
1520 int tried_invalidate = 0;
1521 int delayed = 0, sent = 0, force_requeue = 0, num;
1522 int queue_invalidate = 0;
1523 int is_delayed = flags & CHECK_CAPS_NODELAY;
1524
1525 /* if we are unmounting, flush any unused caps immediately. */
1526 if (mdsc->stopping)
1527 is_delayed = 1;
1528
1529 spin_lock(&ci->i_ceph_lock);
1530
1531 if (ci->i_ceph_flags & CEPH_I_FLUSH)
1532 flags |= CHECK_CAPS_FLUSH;
1533
1534 /* flush snaps first time around only */
1535 if (!list_empty(&ci->i_cap_snaps))
1536 __ceph_flush_snaps(ci, &session, 0);
1537 goto retry_locked;
1538retry:
1539 spin_lock(&ci->i_ceph_lock);
1540retry_locked:
1541 file_wanted = __ceph_caps_file_wanted(ci);
1542 used = __ceph_caps_used(ci);
1543 want = file_wanted | used;
1544 issued = __ceph_caps_issued(ci, &implemented);
1545 revoking = implemented & ~issued;
1546
1547 retain = want | CEPH_CAP_PIN;
1548 if (!mdsc->stopping && inode->i_nlink > 0) {
1549 if (want) {
1550 retain |= CEPH_CAP_ANY; /* be greedy */
1551 } else {
1552 retain |= CEPH_CAP_ANY_SHARED;
1553 /*
1554 * keep RD only if we didn't have the file open RW,
1555 * because then the mds would revoke it anyway to
1556 * journal max_size=0.
1557 */
1558 if (ci->i_max_size == 0)
1559 retain |= CEPH_CAP_ANY_RD;
1560 }
1561 }
1562
1563 dout("check_caps %p file_want %s used %s dirty %s flushing %s"
1564 " issued %s revoking %s retain %s %s%s%s\n", inode,
1565 ceph_cap_string(file_wanted),
1566 ceph_cap_string(used), ceph_cap_string(ci->i_dirty_caps),
1567 ceph_cap_string(ci->i_flushing_caps),
1568 ceph_cap_string(issued), ceph_cap_string(revoking),
1569 ceph_cap_string(retain),
1570 (flags & CHECK_CAPS_AUTHONLY) ? " AUTHONLY" : "",
1571 (flags & CHECK_CAPS_NODELAY) ? " NODELAY" : "",
1572 (flags & CHECK_CAPS_FLUSH) ? " FLUSH" : "");
1573
1574 /*
1575 * If we no longer need to hold onto old our caps, and we may
1576 * have cached pages, but don't want them, then try to invalidate.
1577 * If we fail, it's because pages are locked.... try again later.
1578 */
1579 if ((!is_delayed || mdsc->stopping) &&
1580 ci->i_wrbuffer_ref == 0 && /* no dirty pages... */
1581 inode->i_data.nrpages && /* have cached pages */
1582 (file_wanted == 0 || /* no open files */
1583 (revoking & (CEPH_CAP_FILE_CACHE|
1584 CEPH_CAP_FILE_LAZYIO))) && /* or revoking cache */
1585 !tried_invalidate) {
1586 dout("check_caps trying to invalidate on %p\n", inode);
1587 if (try_nonblocking_invalidate(inode) < 0) {
1588 if (revoking & (CEPH_CAP_FILE_CACHE|
1589 CEPH_CAP_FILE_LAZYIO)) {
1590 dout("check_caps queuing invalidate\n");
1591 queue_invalidate = 1;
1592 ci->i_rdcache_revoking = ci->i_rdcache_gen;
1593 } else {
1594 dout("check_caps failed to invalidate pages\n");
1595 /* we failed to invalidate pages. check these
1596 caps again later. */
1597 force_requeue = 1;
1598 __cap_set_timeouts(mdsc, ci);
1599 }
1600 }
1601 tried_invalidate = 1;
1602 goto retry_locked;
1603 }
1604
1605 num = 0;
1606 for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
1607 cap = rb_entry(p, struct ceph_cap, ci_node);
1608 num++;
1609
1610 /* avoid looping forever */
1611 if (mds >= cap->mds ||
1612 ((flags & CHECK_CAPS_AUTHONLY) && cap != ci->i_auth_cap))
1613 continue;
1614
1615 /* NOTE: no side-effects allowed, until we take s_mutex */
1616
1617 cap_used = used;
1618 if (ci->i_auth_cap && cap != ci->i_auth_cap)
1619 cap_used &= ~ci->i_auth_cap->issued;
1620
1621 revoking = cap->implemented & ~cap->issued;
1622 dout(" mds%d cap %p used %s issued %s implemented %s revoking %s\n",
1623 cap->mds, cap, ceph_cap_string(cap->issued),
1624 ceph_cap_string(cap_used),
1625 ceph_cap_string(cap->implemented),
1626 ceph_cap_string(revoking));
1627
1628 if (cap == ci->i_auth_cap &&
1629 (cap->issued & CEPH_CAP_FILE_WR)) {
1630 /* request larger max_size from MDS? */
1631 if (ci->i_wanted_max_size > ci->i_max_size &&
1632 ci->i_wanted_max_size > ci->i_requested_max_size) {
1633 dout("requesting new max_size\n");
1634 goto ack;
1635 }
1636
1637 /* approaching file_max? */
1638 if ((inode->i_size << 1) >= ci->i_max_size &&
1639 (ci->i_reported_size << 1) < ci->i_max_size) {
1640 dout("i_size approaching max_size\n");
1641 goto ack;
1642 }
1643 }
1644 /* flush anything dirty? */
1645 if (cap == ci->i_auth_cap && (flags & CHECK_CAPS_FLUSH) &&
1646 ci->i_dirty_caps) {
1647 dout("flushing dirty caps\n");
1648 goto ack;
1649 }
1650
1651 /* completed revocation? going down and there are no caps? */
1652 if (revoking && (revoking & cap_used) == 0) {
1653 dout("completed revocation of %s\n",
1654 ceph_cap_string(cap->implemented & ~cap->issued));
1655 goto ack;
1656 }
1657
1658 /* want more caps from mds? */
1659 if (want & ~(cap->mds_wanted | cap->issued))
1660 goto ack;
1661
1662 /* things we might delay */
1663 if ((cap->issued & ~retain) == 0 &&
1664 cap->mds_wanted == want)
1665 continue; /* nope, all good */
1666
1667 if (is_delayed)
1668 goto ack;
1669
1670 /* delay? */
1671 if ((ci->i_ceph_flags & CEPH_I_NODELAY) == 0 &&
1672 time_before(jiffies, ci->i_hold_caps_max)) {
1673 dout(" delaying issued %s -> %s, wanted %s -> %s\n",
1674 ceph_cap_string(cap->issued),
1675 ceph_cap_string(cap->issued & retain),
1676 ceph_cap_string(cap->mds_wanted),
1677 ceph_cap_string(want));
1678 delayed++;
1679 continue;
1680 }
1681
1682ack:
1683 if (ci->i_ceph_flags & CEPH_I_NOFLUSH) {
1684 dout(" skipping %p I_NOFLUSH set\n", inode);
1685 continue;
1686 }
1687
1688 if (session && session != cap->session) {
1689 dout("oops, wrong session %p mutex\n", session);
1690 mutex_unlock(&session->s_mutex);
1691 session = NULL;
1692 }
1693 if (!session) {
1694 session = cap->session;
1695 if (mutex_trylock(&session->s_mutex) == 0) {
1696 dout("inverting session/ino locks on %p\n",
1697 session);
1698 spin_unlock(&ci->i_ceph_lock);
1699 if (took_snap_rwsem) {
1700 up_read(&mdsc->snap_rwsem);
1701 took_snap_rwsem = 0;
1702 }
1703 mutex_lock(&session->s_mutex);
1704 goto retry;
1705 }
1706 }
1707 /* take snap_rwsem after session mutex */
1708 if (!took_snap_rwsem) {
1709 if (down_read_trylock(&mdsc->snap_rwsem) == 0) {
1710 dout("inverting snap/in locks on %p\n",
1711 inode);
1712 spin_unlock(&ci->i_ceph_lock);
1713 down_read(&mdsc->snap_rwsem);
1714 took_snap_rwsem = 1;
1715 goto retry;
1716 }
1717 took_snap_rwsem = 1;
1718 }
1719
1720 if (cap == ci->i_auth_cap && ci->i_dirty_caps)
1721 flushing = __mark_caps_flushing(inode, session);
1722 else
1723 flushing = 0;
1724
1725 mds = cap->mds; /* remember mds, so we don't repeat */
1726 sent++;
1727
1728 /* __send_cap drops i_ceph_lock */
1729 delayed += __send_cap(mdsc, cap, CEPH_CAP_OP_UPDATE, cap_used,
1730 want, retain, flushing, NULL);
1731 goto retry; /* retake i_ceph_lock and restart our cap scan. */
1732 }
1733
1734 /*
1735 * Reschedule delayed caps release if we delayed anything,
1736 * otherwise cancel.
1737 */
1738 if (delayed && is_delayed)
1739 force_requeue = 1; /* __send_cap delayed release; requeue */
1740 if (!delayed && !is_delayed)
1741 __cap_delay_cancel(mdsc, ci);
1742 else if (!is_delayed || force_requeue)
1743 __cap_delay_requeue(mdsc, ci);
1744
1745 spin_unlock(&ci->i_ceph_lock);
1746
1747 if (queue_invalidate)
1748 ceph_queue_invalidate(inode);
1749
1750 if (session)
1751 mutex_unlock(&session->s_mutex);
1752 if (took_snap_rwsem)
1753 up_read(&mdsc->snap_rwsem);
1754}
1755
1756/*
1757 * Try to flush dirty caps back to the auth mds.
1758 */
1759static int try_flush_caps(struct inode *inode, unsigned *flush_tid)
1760{
1761 struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
1762 struct ceph_inode_info *ci = ceph_inode(inode);
1763 int flushing = 0;
1764 struct ceph_mds_session *session = NULL;
1765
1766retry:
1767 spin_lock(&ci->i_ceph_lock);
1768 if (ci->i_ceph_flags & CEPH_I_NOFLUSH) {
1769 dout("try_flush_caps skipping %p I_NOFLUSH set\n", inode);
1770 goto out;
1771 }
1772 if (ci->i_dirty_caps && ci->i_auth_cap) {
1773 struct ceph_cap *cap = ci->i_auth_cap;
1774 int used = __ceph_caps_used(ci);
1775 int want = __ceph_caps_wanted(ci);
1776 int delayed;
1777
1778 if (!session || session != cap->session) {
1779 spin_unlock(&ci->i_ceph_lock);
1780 if (session)
1781 mutex_unlock(&session->s_mutex);
1782 session = cap->session;
1783 mutex_lock(&session->s_mutex);
1784 goto retry;
1785 }
1786 if (cap->session->s_state < CEPH_MDS_SESSION_OPEN)
1787 goto out;
1788
1789 flushing = __mark_caps_flushing(inode, session);
1790
1791 /* __send_cap drops i_ceph_lock */
1792 delayed = __send_cap(mdsc, cap, CEPH_CAP_OP_FLUSH, used, want,
1793 cap->issued | cap->implemented, flushing,
1794 flush_tid);
1795 if (!delayed)
1796 goto out_unlocked;
1797
1798 spin_lock(&ci->i_ceph_lock);
1799 __cap_delay_requeue(mdsc, ci);
1800 }
1801out:
1802 spin_unlock(&ci->i_ceph_lock);
1803out_unlocked:
1804 if (session)
1805 mutex_unlock(&session->s_mutex);
1806 return flushing;
1807}
1808
1809/*
1810 * Return true if we've flushed caps through the given flush_tid.
1811 */
1812static int caps_are_flushed(struct inode *inode, unsigned tid)
1813{
1814 struct ceph_inode_info *ci = ceph_inode(inode);
1815 int i, ret = 1;
1816
1817 spin_lock(&ci->i_ceph_lock);
1818 for (i = 0; i < CEPH_CAP_BITS; i++)
1819 if ((ci->i_flushing_caps & (1 << i)) &&
1820 ci->i_cap_flush_tid[i] <= tid) {
1821 /* still flushing this bit */
1822 ret = 0;
1823 break;
1824 }
1825 spin_unlock(&ci->i_ceph_lock);
1826 return ret;
1827}
1828
1829/*
1830 * Wait on any unsafe replies for the given inode. First wait on the
1831 * newest request, and make that the upper bound. Then, if there are
1832 * more requests, keep waiting on the oldest as long as it is still older
1833 * than the original request.
1834 */
1835static void sync_write_wait(struct inode *inode)
1836{
1837 struct ceph_inode_info *ci = ceph_inode(inode);
1838 struct list_head *head = &ci->i_unsafe_writes;
1839 struct ceph_osd_request *req;
1840 u64 last_tid;
1841
1842 spin_lock(&ci->i_unsafe_lock);
1843 if (list_empty(head))
1844 goto out;
1845
1846 /* set upper bound as _last_ entry in chain */
1847 req = list_entry(head->prev, struct ceph_osd_request,
1848 r_unsafe_item);
1849 last_tid = req->r_tid;
1850
1851 do {
1852 ceph_osdc_get_request(req);
1853 spin_unlock(&ci->i_unsafe_lock);
1854 dout("sync_write_wait on tid %llu (until %llu)\n",
1855 req->r_tid, last_tid);
1856 wait_for_completion(&req->r_safe_completion);
1857 spin_lock(&ci->i_unsafe_lock);
1858 ceph_osdc_put_request(req);
1859
1860 /*
1861 * from here on look at first entry in chain, since we
1862 * only want to wait for anything older than last_tid
1863 */
1864 if (list_empty(head))
1865 break;
1866 req = list_entry(head->next, struct ceph_osd_request,
1867 r_unsafe_item);
1868 } while (req->r_tid < last_tid);
1869out:
1870 spin_unlock(&ci->i_unsafe_lock);
1871}
1872
1873int ceph_fsync(struct file *file, loff_t start, loff_t end, int datasync)
1874{
1875 struct inode *inode = file->f_mapping->host;
1876 struct ceph_inode_info *ci = ceph_inode(inode);
1877 unsigned flush_tid;
1878 int ret;
1879 int dirty;
1880
1881 dout("fsync %p%s\n", inode, datasync ? " datasync" : "");
1882 sync_write_wait(inode);
1883
1884 ret = filemap_write_and_wait_range(inode->i_mapping, start, end);
1885 if (ret < 0)
1886 return ret;
1887 mutex_lock(&inode->i_mutex);
1888
1889 dirty = try_flush_caps(inode, &flush_tid);
1890 dout("fsync dirty caps are %s\n", ceph_cap_string(dirty));
1891
1892 /*
1893 * only wait on non-file metadata writeback (the mds
1894 * can recover size and mtime, so we don't need to
1895 * wait for that)
1896 */
1897 if (!datasync && (dirty & ~CEPH_CAP_ANY_FILE_WR)) {
1898 dout("fsync waiting for flush_tid %u\n", flush_tid);
1899 ret = wait_event_interruptible(ci->i_cap_wq,
1900 caps_are_flushed(inode, flush_tid));
1901 }
1902
1903 dout("fsync %p%s done\n", inode, datasync ? " datasync" : "");
1904 mutex_unlock(&inode->i_mutex);
1905 return ret;
1906}
1907
1908/*
1909 * Flush any dirty caps back to the mds. If we aren't asked to wait,
1910 * queue inode for flush but don't do so immediately, because we can
1911 * get by with fewer MDS messages if we wait for data writeback to
1912 * complete first.
1913 */
1914int ceph_write_inode(struct inode *inode, struct writeback_control *wbc)
1915{
1916 struct ceph_inode_info *ci = ceph_inode(inode);
1917 unsigned flush_tid;
1918 int err = 0;
1919 int dirty;
1920 int wait = wbc->sync_mode == WB_SYNC_ALL;
1921
1922 dout("write_inode %p wait=%d\n", inode, wait);
1923 if (wait) {
1924 dirty = try_flush_caps(inode, &flush_tid);
1925 if (dirty)
1926 err = wait_event_interruptible(ci->i_cap_wq,
1927 caps_are_flushed(inode, flush_tid));
1928 } else {
1929 struct ceph_mds_client *mdsc =
1930 ceph_sb_to_client(inode->i_sb)->mdsc;
1931
1932 spin_lock(&ci->i_ceph_lock);
1933 if (__ceph_caps_dirty(ci))
1934 __cap_delay_requeue_front(mdsc, ci);
1935 spin_unlock(&ci->i_ceph_lock);
1936 }
1937 return err;
1938}
1939
1940/*
1941 * After a recovering MDS goes active, we need to resend any caps
1942 * we were flushing.
1943 *
1944 * Caller holds session->s_mutex.
1945 */
1946static void kick_flushing_capsnaps(struct ceph_mds_client *mdsc,
1947 struct ceph_mds_session *session)
1948{
1949 struct ceph_cap_snap *capsnap;
1950
1951 dout("kick_flushing_capsnaps mds%d\n", session->s_mds);
1952 list_for_each_entry(capsnap, &session->s_cap_snaps_flushing,
1953 flushing_item) {
1954 struct ceph_inode_info *ci = capsnap->ci;
1955 struct inode *inode = &ci->vfs_inode;
1956 struct ceph_cap *cap;
1957
1958 spin_lock(&ci->i_ceph_lock);
1959 cap = ci->i_auth_cap;
1960 if (cap && cap->session == session) {
1961 dout("kick_flushing_caps %p cap %p capsnap %p\n", inode,
1962 cap, capsnap);
1963 __ceph_flush_snaps(ci, &session, 1);
1964 } else {
1965 pr_err("%p auth cap %p not mds%d ???\n", inode,
1966 cap, session->s_mds);
1967 }
1968 spin_unlock(&ci->i_ceph_lock);
1969 }
1970}
1971
1972void ceph_kick_flushing_caps(struct ceph_mds_client *mdsc,
1973 struct ceph_mds_session *session)
1974{
1975 struct ceph_inode_info *ci;
1976
1977 kick_flushing_capsnaps(mdsc, session);
1978
1979 dout("kick_flushing_caps mds%d\n", session->s_mds);
1980 list_for_each_entry(ci, &session->s_cap_flushing, i_flushing_item) {
1981 struct inode *inode = &ci->vfs_inode;
1982 struct ceph_cap *cap;
1983 int delayed = 0;
1984
1985 spin_lock(&ci->i_ceph_lock);
1986 cap = ci->i_auth_cap;
1987 if (cap && cap->session == session) {
1988 dout("kick_flushing_caps %p cap %p %s\n", inode,
1989 cap, ceph_cap_string(ci->i_flushing_caps));
1990 delayed = __send_cap(mdsc, cap, CEPH_CAP_OP_FLUSH,
1991 __ceph_caps_used(ci),
1992 __ceph_caps_wanted(ci),
1993 cap->issued | cap->implemented,
1994 ci->i_flushing_caps, NULL);
1995 if (delayed) {
1996 spin_lock(&ci->i_ceph_lock);
1997 __cap_delay_requeue(mdsc, ci);
1998 spin_unlock(&ci->i_ceph_lock);
1999 }
2000 } else {
2001 pr_err("%p auth cap %p not mds%d ???\n", inode,
2002 cap, session->s_mds);
2003 spin_unlock(&ci->i_ceph_lock);
2004 }
2005 }
2006}
2007
2008static void kick_flushing_inode_caps(struct ceph_mds_client *mdsc,
2009 struct ceph_mds_session *session,
2010 struct inode *inode)
2011{
2012 struct ceph_inode_info *ci = ceph_inode(inode);
2013 struct ceph_cap *cap;
2014 int delayed = 0;
2015
2016 spin_lock(&ci->i_ceph_lock);
2017 cap = ci->i_auth_cap;
2018 dout("kick_flushing_inode_caps %p flushing %s flush_seq %lld\n", inode,
2019 ceph_cap_string(ci->i_flushing_caps), ci->i_cap_flush_seq);
2020
2021 __ceph_flush_snaps(ci, &session, 1);
2022
2023 if (ci->i_flushing_caps) {
2024 spin_lock(&mdsc->cap_dirty_lock);
2025 list_move_tail(&ci->i_flushing_item,
2026 &cap->session->s_cap_flushing);
2027 spin_unlock(&mdsc->cap_dirty_lock);
2028
2029 delayed = __send_cap(mdsc, cap, CEPH_CAP_OP_FLUSH,
2030 __ceph_caps_used(ci),
2031 __ceph_caps_wanted(ci),
2032 cap->issued | cap->implemented,
2033 ci->i_flushing_caps, NULL);
2034 if (delayed) {
2035 spin_lock(&ci->i_ceph_lock);
2036 __cap_delay_requeue(mdsc, ci);
2037 spin_unlock(&ci->i_ceph_lock);
2038 }
2039 } else {
2040 spin_unlock(&ci->i_ceph_lock);
2041 }
2042}
2043
2044
2045/*
2046 * Take references to capabilities we hold, so that we don't release
2047 * them to the MDS prematurely.
2048 *
2049 * Protected by i_ceph_lock.
2050 */
2051static void __take_cap_refs(struct ceph_inode_info *ci, int got)
2052{
2053 if (got & CEPH_CAP_PIN)
2054 ci->i_pin_ref++;
2055 if (got & CEPH_CAP_FILE_RD)
2056 ci->i_rd_ref++;
2057 if (got & CEPH_CAP_FILE_CACHE)
2058 ci->i_rdcache_ref++;
2059 if (got & CEPH_CAP_FILE_WR)
2060 ci->i_wr_ref++;
2061 if (got & CEPH_CAP_FILE_BUFFER) {
2062 if (ci->i_wb_ref == 0)
2063 ihold(&ci->vfs_inode);
2064 ci->i_wb_ref++;
2065 dout("__take_cap_refs %p wb %d -> %d (?)\n",
2066 &ci->vfs_inode, ci->i_wb_ref-1, ci->i_wb_ref);
2067 }
2068}
2069
2070/*
2071 * Try to grab cap references. Specify those refs we @want, and the
2072 * minimal set we @need. Also include the larger offset we are writing
2073 * to (when applicable), and check against max_size here as well.
2074 * Note that caller is responsible for ensuring max_size increases are
2075 * requested from the MDS.
2076 */
2077static int try_get_cap_refs(struct ceph_inode_info *ci, int need, int want,
2078 int *got, loff_t endoff, int *check_max, int *err)
2079{
2080 struct inode *inode = &ci->vfs_inode;
2081 int ret = 0;
2082 int have, implemented;
2083 int file_wanted;
2084
2085 dout("get_cap_refs %p need %s want %s\n", inode,
2086 ceph_cap_string(need), ceph_cap_string(want));
2087 spin_lock(&ci->i_ceph_lock);
2088
2089 /* make sure file is actually open */
2090 file_wanted = __ceph_caps_file_wanted(ci);
2091 if ((file_wanted & need) == 0) {
2092 dout("try_get_cap_refs need %s file_wanted %s, EBADF\n",
2093 ceph_cap_string(need), ceph_cap_string(file_wanted));
2094 *err = -EBADF;
2095 ret = 1;
2096 goto out;
2097 }
2098
2099 /* finish pending truncate */
2100 while (ci->i_truncate_pending) {
2101 spin_unlock(&ci->i_ceph_lock);
2102 __ceph_do_pending_vmtruncate(inode);
2103 spin_lock(&ci->i_ceph_lock);
2104 }
2105
2106 have = __ceph_caps_issued(ci, &implemented);
2107
2108 if (have & need & CEPH_CAP_FILE_WR) {
2109 if (endoff >= 0 && endoff > (loff_t)ci->i_max_size) {
2110 dout("get_cap_refs %p endoff %llu > maxsize %llu\n",
2111 inode, endoff, ci->i_max_size);
2112 if (endoff > ci->i_requested_max_size) {
2113 *check_max = 1;
2114 ret = 1;
2115 }
2116 goto out;
2117 }
2118 /*
2119 * If a sync write is in progress, we must wait, so that we
2120 * can get a final snapshot value for size+mtime.
2121 */
2122 if (__ceph_have_pending_cap_snap(ci)) {
2123 dout("get_cap_refs %p cap_snap_pending\n", inode);
2124 goto out;
2125 }
2126 }
2127
2128 if ((have & need) == need) {
2129 /*
2130 * Look at (implemented & ~have & not) so that we keep waiting
2131 * on transition from wanted -> needed caps. This is needed
2132 * for WRBUFFER|WR -> WR to avoid a new WR sync write from
2133 * going before a prior buffered writeback happens.
2134 */
2135 int not = want & ~(have & need);
2136 int revoking = implemented & ~have;
2137 dout("get_cap_refs %p have %s but not %s (revoking %s)\n",
2138 inode, ceph_cap_string(have), ceph_cap_string(not),
2139 ceph_cap_string(revoking));
2140 if ((revoking & not) == 0) {
2141 *got = need | (have & want);
2142 __take_cap_refs(ci, *got);
2143 ret = 1;
2144 }
2145 } else {
2146 dout("get_cap_refs %p have %s needed %s\n", inode,
2147 ceph_cap_string(have), ceph_cap_string(need));
2148 }
2149out:
2150 spin_unlock(&ci->i_ceph_lock);
2151 dout("get_cap_refs %p ret %d got %s\n", inode,
2152 ret, ceph_cap_string(*got));
2153 return ret;
2154}
2155
2156/*
2157 * Check the offset we are writing up to against our current
2158 * max_size. If necessary, tell the MDS we want to write to
2159 * a larger offset.
2160 */
2161static void check_max_size(struct inode *inode, loff_t endoff)
2162{
2163 struct ceph_inode_info *ci = ceph_inode(inode);
2164 int check = 0;
2165
2166 /* do we need to explicitly request a larger max_size? */
2167 spin_lock(&ci->i_ceph_lock);
2168 if (endoff >= ci->i_max_size && endoff > ci->i_wanted_max_size) {
2169 dout("write %p at large endoff %llu, req max_size\n",
2170 inode, endoff);
2171 ci->i_wanted_max_size = endoff;
2172 }
2173 /* duplicate ceph_check_caps()'s logic */
2174 if (ci->i_auth_cap &&
2175 (ci->i_auth_cap->issued & CEPH_CAP_FILE_WR) &&
2176 ci->i_wanted_max_size > ci->i_max_size &&
2177 ci->i_wanted_max_size > ci->i_requested_max_size)
2178 check = 1;
2179 spin_unlock(&ci->i_ceph_lock);
2180 if (check)
2181 ceph_check_caps(ci, CHECK_CAPS_AUTHONLY, NULL);
2182}
2183
2184/*
2185 * Wait for caps, and take cap references. If we can't get a WR cap
2186 * due to a small max_size, make sure we check_max_size (and possibly
2187 * ask the mds) so we don't get hung up indefinitely.
2188 */
2189int ceph_get_caps(struct ceph_inode_info *ci, int need, int want, int *got,
2190 loff_t endoff)
2191{
2192 int check_max, ret, err;
2193
2194retry:
2195 if (endoff > 0)
2196 check_max_size(&ci->vfs_inode, endoff);
2197 check_max = 0;
2198 err = 0;
2199 ret = wait_event_interruptible(ci->i_cap_wq,
2200 try_get_cap_refs(ci, need, want,
2201 got, endoff,
2202 &check_max, &err));
2203 if (err)
2204 ret = err;
2205 if (check_max)
2206 goto retry;
2207 return ret;
2208}
2209
2210/*
2211 * Take cap refs. Caller must already know we hold at least one ref
2212 * on the caps in question or we don't know this is safe.
2213 */
2214void ceph_get_cap_refs(struct ceph_inode_info *ci, int caps)
2215{
2216 spin_lock(&ci->i_ceph_lock);
2217 __take_cap_refs(ci, caps);
2218 spin_unlock(&ci->i_ceph_lock);
2219}
2220
2221/*
2222 * Release cap refs.
2223 *
2224 * If we released the last ref on any given cap, call ceph_check_caps
2225 * to release (or schedule a release).
2226 *
2227 * If we are releasing a WR cap (from a sync write), finalize any affected
2228 * cap_snap, and wake up any waiters.
2229 */
2230void ceph_put_cap_refs(struct ceph_inode_info *ci, int had)
2231{
2232 struct inode *inode = &ci->vfs_inode;
2233 int last = 0, put = 0, flushsnaps = 0, wake = 0;
2234 struct ceph_cap_snap *capsnap;
2235
2236 spin_lock(&ci->i_ceph_lock);
2237 if (had & CEPH_CAP_PIN)
2238 --ci->i_pin_ref;
2239 if (had & CEPH_CAP_FILE_RD)
2240 if (--ci->i_rd_ref == 0)
2241 last++;
2242 if (had & CEPH_CAP_FILE_CACHE)
2243 if (--ci->i_rdcache_ref == 0)
2244 last++;
2245 if (had & CEPH_CAP_FILE_BUFFER) {
2246 if (--ci->i_wb_ref == 0) {
2247 last++;
2248 put++;
2249 }
2250 dout("put_cap_refs %p wb %d -> %d (?)\n",
2251 inode, ci->i_wb_ref+1, ci->i_wb_ref);
2252 }
2253 if (had & CEPH_CAP_FILE_WR)
2254 if (--ci->i_wr_ref == 0) {
2255 last++;
2256 if (!list_empty(&ci->i_cap_snaps)) {
2257 capsnap = list_first_entry(&ci->i_cap_snaps,
2258 struct ceph_cap_snap,
2259 ci_item);
2260 if (capsnap->writing) {
2261 capsnap->writing = 0;
2262 flushsnaps =
2263 __ceph_finish_cap_snap(ci,
2264 capsnap);
2265 wake = 1;
2266 }
2267 }
2268 }
2269 spin_unlock(&ci->i_ceph_lock);
2270
2271 dout("put_cap_refs %p had %s%s%s\n", inode, ceph_cap_string(had),
2272 last ? " last" : "", put ? " put" : "");
2273
2274 if (last && !flushsnaps)
2275 ceph_check_caps(ci, 0, NULL);
2276 else if (flushsnaps)
2277 ceph_flush_snaps(ci);
2278 if (wake)
2279 wake_up_all(&ci->i_cap_wq);
2280 if (put)
2281 iput(inode);
2282}
2283
2284/*
2285 * Release @nr WRBUFFER refs on dirty pages for the given @snapc snap
2286 * context. Adjust per-snap dirty page accounting as appropriate.
2287 * Once all dirty data for a cap_snap is flushed, flush snapped file
2288 * metadata back to the MDS. If we dropped the last ref, call
2289 * ceph_check_caps.
2290 */
2291void ceph_put_wrbuffer_cap_refs(struct ceph_inode_info *ci, int nr,
2292 struct ceph_snap_context *snapc)
2293{
2294 struct inode *inode = &ci->vfs_inode;
2295 int last = 0;
2296 int complete_capsnap = 0;
2297 int drop_capsnap = 0;
2298 int found = 0;
2299 struct ceph_cap_snap *capsnap = NULL;
2300
2301 spin_lock(&ci->i_ceph_lock);
2302 ci->i_wrbuffer_ref -= nr;
2303 last = !ci->i_wrbuffer_ref;
2304
2305 if (ci->i_head_snapc == snapc) {
2306 ci->i_wrbuffer_ref_head -= nr;
2307 if (ci->i_wrbuffer_ref_head == 0 &&
2308 ci->i_dirty_caps == 0 && ci->i_flushing_caps == 0) {
2309 BUG_ON(!ci->i_head_snapc);
2310 ceph_put_snap_context(ci->i_head_snapc);
2311 ci->i_head_snapc = NULL;
2312 }
2313 dout("put_wrbuffer_cap_refs on %p head %d/%d -> %d/%d %s\n",
2314 inode,
2315 ci->i_wrbuffer_ref+nr, ci->i_wrbuffer_ref_head+nr,
2316 ci->i_wrbuffer_ref, ci->i_wrbuffer_ref_head,
2317 last ? " LAST" : "");
2318 } else {
2319 list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) {
2320 if (capsnap->context == snapc) {
2321 found = 1;
2322 break;
2323 }
2324 }
2325 BUG_ON(!found);
2326 capsnap->dirty_pages -= nr;
2327 if (capsnap->dirty_pages == 0) {
2328 complete_capsnap = 1;
2329 if (capsnap->dirty == 0)
2330 /* cap writeback completed before we created
2331 * the cap_snap; no FLUSHSNAP is needed */
2332 drop_capsnap = 1;
2333 }
2334 dout("put_wrbuffer_cap_refs on %p cap_snap %p "
2335 " snap %lld %d/%d -> %d/%d %s%s%s\n",
2336 inode, capsnap, capsnap->context->seq,
2337 ci->i_wrbuffer_ref+nr, capsnap->dirty_pages + nr,
2338 ci->i_wrbuffer_ref, capsnap->dirty_pages,
2339 last ? " (wrbuffer last)" : "",
2340 complete_capsnap ? " (complete capsnap)" : "",
2341 drop_capsnap ? " (drop capsnap)" : "");
2342 if (drop_capsnap) {
2343 ceph_put_snap_context(capsnap->context);
2344 list_del(&capsnap->ci_item);
2345 list_del(&capsnap->flushing_item);
2346 ceph_put_cap_snap(capsnap);
2347 }
2348 }
2349
2350 spin_unlock(&ci->i_ceph_lock);
2351
2352 if (last) {
2353 ceph_check_caps(ci, CHECK_CAPS_AUTHONLY, NULL);
2354 iput(inode);
2355 } else if (complete_capsnap) {
2356 ceph_flush_snaps(ci);
2357 wake_up_all(&ci->i_cap_wq);
2358 }
2359 if (drop_capsnap)
2360 iput(inode);
2361}
2362
2363/*
2364 * Invalidate unlinked inode's aliases, so we can drop the inode ASAP.
2365 */
2366static void invalidate_aliases(struct inode *inode)
2367{
2368 struct dentry *dn, *prev = NULL;
2369
2370 dout("invalidate_aliases inode %p\n", inode);
2371 d_prune_aliases(inode);
2372 /*
2373 * For non-directory inode, d_find_alias() only returns
2374 * hashed dentry. After calling d_invalidate(), the
2375 * dentry becomes unhashed.
2376 *
2377 * For directory inode, d_find_alias() can return
2378 * unhashed dentry. But directory inode should have
2379 * one alias at most.
2380 */
2381 while ((dn = d_find_alias(inode))) {
2382 if (dn == prev) {
2383 dput(dn);
2384 break;
2385 }
2386 d_invalidate(dn);
2387 if (prev)
2388 dput(prev);
2389 prev = dn;
2390 }
2391 if (prev)
2392 dput(prev);
2393}
2394
2395/*
2396 * Handle a cap GRANT message from the MDS. (Note that a GRANT may
2397 * actually be a revocation if it specifies a smaller cap set.)
2398 *
2399 * caller holds s_mutex and i_ceph_lock, we drop both.
2400 *
2401 * return value:
2402 * 0 - ok
2403 * 1 - check_caps on auth cap only (writeback)
2404 * 2 - check_caps (ack revoke)
2405 */
2406static void handle_cap_grant(struct inode *inode, struct ceph_mds_caps *grant,
2407 struct ceph_mds_session *session,
2408 struct ceph_cap *cap,
2409 struct ceph_buffer *xattr_buf)
2410 __releases(ci->i_ceph_lock)
2411{
2412 struct ceph_inode_info *ci = ceph_inode(inode);
2413 int mds = session->s_mds;
2414 int seq = le32_to_cpu(grant->seq);
2415 int newcaps = le32_to_cpu(grant->caps);
2416 int issued, implemented, used, wanted, dirty;
2417 u64 size = le64_to_cpu(grant->size);
2418 u64 max_size = le64_to_cpu(grant->max_size);
2419 struct timespec mtime, atime, ctime;
2420 int check_caps = 0;
2421 int wake = 0;
2422 int writeback = 0;
2423 int queue_invalidate = 0;
2424 int deleted_inode = 0;
2425 int queue_revalidate = 0;
2426
2427 dout("handle_cap_grant inode %p cap %p mds%d seq %d %s\n",
2428 inode, cap, mds, seq, ceph_cap_string(newcaps));
2429 dout(" size %llu max_size %llu, i_size %llu\n", size, max_size,
2430 inode->i_size);
2431
2432
2433 /*
2434 * auth mds of the inode changed. we received the cap export message,
2435 * but still haven't received the cap import message. handle_cap_export
2436 * updated the new auth MDS' cap.
2437 *
2438 * "ceph_seq_cmp(seq, cap->seq) <= 0" means we are processing a message
2439 * that was sent before the cap import message. So don't remove caps.
2440 */
2441 if (ceph_seq_cmp(seq, cap->seq) <= 0) {
2442 WARN_ON(cap != ci->i_auth_cap);
2443 WARN_ON(cap->cap_id != le64_to_cpu(grant->cap_id));
2444 seq = cap->seq;
2445 newcaps |= cap->issued;
2446 }
2447
2448 /*
2449 * If CACHE is being revoked, and we have no dirty buffers,
2450 * try to invalidate (once). (If there are dirty buffers, we
2451 * will invalidate _after_ writeback.)
2452 */
2453 if (((cap->issued & ~newcaps) & CEPH_CAP_FILE_CACHE) &&
2454 (newcaps & CEPH_CAP_FILE_LAZYIO) == 0 &&
2455 !ci->i_wrbuffer_ref) {
2456 if (try_nonblocking_invalidate(inode)) {
2457 /* there were locked pages.. invalidate later
2458 in a separate thread. */
2459 if (ci->i_rdcache_revoking != ci->i_rdcache_gen) {
2460 queue_invalidate = 1;
2461 ci->i_rdcache_revoking = ci->i_rdcache_gen;
2462 }
2463 }
2464
2465 ceph_fscache_invalidate(inode);
2466 }
2467
2468 /* side effects now are allowed */
2469
2470 issued = __ceph_caps_issued(ci, &implemented);
2471 issued |= implemented | __ceph_caps_dirty(ci);
2472
2473 cap->cap_gen = session->s_cap_gen;
2474 cap->seq = seq;
2475
2476 __check_cap_issue(ci, cap, newcaps);
2477
2478 if ((issued & CEPH_CAP_AUTH_EXCL) == 0) {
2479 inode->i_mode = le32_to_cpu(grant->mode);
2480 inode->i_uid = make_kuid(&init_user_ns, le32_to_cpu(grant->uid));
2481 inode->i_gid = make_kgid(&init_user_ns, le32_to_cpu(grant->gid));
2482 dout("%p mode 0%o uid.gid %d.%d\n", inode, inode->i_mode,
2483 from_kuid(&init_user_ns, inode->i_uid),
2484 from_kgid(&init_user_ns, inode->i_gid));
2485 }
2486
2487 if ((issued & CEPH_CAP_LINK_EXCL) == 0) {
2488 set_nlink(inode, le32_to_cpu(grant->nlink));
2489 if (inode->i_nlink == 0 &&
2490 (newcaps & (CEPH_CAP_LINK_SHARED | CEPH_CAP_LINK_EXCL)))
2491 deleted_inode = 1;
2492 }
2493
2494 if ((issued & CEPH_CAP_XATTR_EXCL) == 0 && grant->xattr_len) {
2495 int len = le32_to_cpu(grant->xattr_len);
2496 u64 version = le64_to_cpu(grant->xattr_version);
2497
2498 if (version > ci->i_xattrs.version) {
2499 dout(" got new xattrs v%llu on %p len %d\n",
2500 version, inode, len);
2501 if (ci->i_xattrs.blob)
2502 ceph_buffer_put(ci->i_xattrs.blob);
2503 ci->i_xattrs.blob = ceph_buffer_get(xattr_buf);
2504 ci->i_xattrs.version = version;
2505 ceph_forget_all_cached_acls(inode);
2506 }
2507 }
2508
2509 /* Do we need to revalidate our fscache cookie. Don't bother on the
2510 * first cache cap as we already validate at cookie creation time. */
2511 if ((issued & CEPH_CAP_FILE_CACHE) && ci->i_rdcache_gen > 1)
2512 queue_revalidate = 1;
2513
2514 /* size/ctime/mtime/atime? */
2515 ceph_fill_file_size(inode, issued,
2516 le32_to_cpu(grant->truncate_seq),
2517 le64_to_cpu(grant->truncate_size), size);
2518 ceph_decode_timespec(&mtime, &grant->mtime);
2519 ceph_decode_timespec(&atime, &grant->atime);
2520 ceph_decode_timespec(&ctime, &grant->ctime);
2521 ceph_fill_file_time(inode, issued,
2522 le32_to_cpu(grant->time_warp_seq), &ctime, &mtime,
2523 &atime);
2524
2525
2526 /* file layout may have changed */
2527 ci->i_layout = grant->layout;
2528
2529 /* max size increase? */
2530 if (ci->i_auth_cap == cap && max_size != ci->i_max_size) {
2531 dout("max_size %lld -> %llu\n", ci->i_max_size, max_size);
2532 ci->i_max_size = max_size;
2533 if (max_size >= ci->i_wanted_max_size) {
2534 ci->i_wanted_max_size = 0; /* reset */
2535 ci->i_requested_max_size = 0;
2536 }
2537 wake = 1;
2538 }
2539
2540 /* check cap bits */
2541 wanted = __ceph_caps_wanted(ci);
2542 used = __ceph_caps_used(ci);
2543 dirty = __ceph_caps_dirty(ci);
2544 dout(" my wanted = %s, used = %s, dirty %s\n",
2545 ceph_cap_string(wanted),
2546 ceph_cap_string(used),
2547 ceph_cap_string(dirty));
2548 if (wanted != le32_to_cpu(grant->wanted)) {
2549 dout("mds wanted %s -> %s\n",
2550 ceph_cap_string(le32_to_cpu(grant->wanted)),
2551 ceph_cap_string(wanted));
2552 /* imported cap may not have correct mds_wanted */
2553 if (le32_to_cpu(grant->op) == CEPH_CAP_OP_IMPORT)
2554 check_caps = 1;
2555 }
2556
2557 /* revocation, grant, or no-op? */
2558 if (cap->issued & ~newcaps) {
2559 int revoking = cap->issued & ~newcaps;
2560
2561 dout("revocation: %s -> %s (revoking %s)\n",
2562 ceph_cap_string(cap->issued),
2563 ceph_cap_string(newcaps),
2564 ceph_cap_string(revoking));
2565 if (revoking & used & CEPH_CAP_FILE_BUFFER)
2566 writeback = 1; /* initiate writeback; will delay ack */
2567 else if (revoking == CEPH_CAP_FILE_CACHE &&
2568 (newcaps & CEPH_CAP_FILE_LAZYIO) == 0 &&
2569 queue_invalidate)
2570 ; /* do nothing yet, invalidation will be queued */
2571 else if (cap == ci->i_auth_cap)
2572 check_caps = 1; /* check auth cap only */
2573 else
2574 check_caps = 2; /* check all caps */
2575 cap->issued = newcaps;
2576 cap->implemented |= newcaps;
2577 } else if (cap->issued == newcaps) {
2578 dout("caps unchanged: %s -> %s\n",
2579 ceph_cap_string(cap->issued), ceph_cap_string(newcaps));
2580 } else {
2581 dout("grant: %s -> %s\n", ceph_cap_string(cap->issued),
2582 ceph_cap_string(newcaps));
2583 /* non-auth MDS is revoking the newly grant caps ? */
2584 if (cap == ci->i_auth_cap &&
2585 __ceph_caps_revoking_other(ci, cap, newcaps))
2586 check_caps = 2;
2587
2588 cap->issued = newcaps;
2589 cap->implemented |= newcaps; /* add bits only, to
2590 * avoid stepping on a
2591 * pending revocation */
2592 wake = 1;
2593 }
2594 BUG_ON(cap->issued & ~cap->implemented);
2595
2596 spin_unlock(&ci->i_ceph_lock);
2597
2598 if (writeback)
2599 /*
2600 * queue inode for writeback: we can't actually call
2601 * filemap_write_and_wait, etc. from message handler
2602 * context.
2603 */
2604 ceph_queue_writeback(inode);
2605 if (queue_invalidate)
2606 ceph_queue_invalidate(inode);
2607 if (deleted_inode)
2608 invalidate_aliases(inode);
2609 if (queue_revalidate)
2610 ceph_queue_revalidate(inode);
2611 if (wake)
2612 wake_up_all(&ci->i_cap_wq);
2613
2614 if (check_caps == 1)
2615 ceph_check_caps(ci, CHECK_CAPS_NODELAY|CHECK_CAPS_AUTHONLY,
2616 session);
2617 else if (check_caps == 2)
2618 ceph_check_caps(ci, CHECK_CAPS_NODELAY, session);
2619 else
2620 mutex_unlock(&session->s_mutex);
2621}
2622
2623/*
2624 * Handle FLUSH_ACK from MDS, indicating that metadata we sent to the
2625 * MDS has been safely committed.
2626 */
2627static void handle_cap_flush_ack(struct inode *inode, u64 flush_tid,
2628 struct ceph_mds_caps *m,
2629 struct ceph_mds_session *session,
2630 struct ceph_cap *cap)
2631 __releases(ci->i_ceph_lock)
2632{
2633 struct ceph_inode_info *ci = ceph_inode(inode);
2634 struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
2635 unsigned seq = le32_to_cpu(m->seq);
2636 int dirty = le32_to_cpu(m->dirty);
2637 int cleaned = 0;
2638 int drop = 0;
2639 int i;
2640
2641 for (i = 0; i < CEPH_CAP_BITS; i++)
2642 if ((dirty & (1 << i)) &&
2643 flush_tid == ci->i_cap_flush_tid[i])
2644 cleaned |= 1 << i;
2645
2646 dout("handle_cap_flush_ack inode %p mds%d seq %d on %s cleaned %s,"
2647 " flushing %s -> %s\n",
2648 inode, session->s_mds, seq, ceph_cap_string(dirty),
2649 ceph_cap_string(cleaned), ceph_cap_string(ci->i_flushing_caps),
2650 ceph_cap_string(ci->i_flushing_caps & ~cleaned));
2651
2652 if (ci->i_flushing_caps == (ci->i_flushing_caps & ~cleaned))
2653 goto out;
2654
2655 ci->i_flushing_caps &= ~cleaned;
2656
2657 spin_lock(&mdsc->cap_dirty_lock);
2658 if (ci->i_flushing_caps == 0) {
2659 list_del_init(&ci->i_flushing_item);
2660 if (!list_empty(&session->s_cap_flushing))
2661 dout(" mds%d still flushing cap on %p\n",
2662 session->s_mds,
2663 &list_entry(session->s_cap_flushing.next,
2664 struct ceph_inode_info,
2665 i_flushing_item)->vfs_inode);
2666 mdsc->num_cap_flushing--;
2667 wake_up_all(&mdsc->cap_flushing_wq);
2668 dout(" inode %p now !flushing\n", inode);
2669
2670 if (ci->i_dirty_caps == 0) {
2671 dout(" inode %p now clean\n", inode);
2672 BUG_ON(!list_empty(&ci->i_dirty_item));
2673 drop = 1;
2674 if (ci->i_wrbuffer_ref_head == 0) {
2675 BUG_ON(!ci->i_head_snapc);
2676 ceph_put_snap_context(ci->i_head_snapc);
2677 ci->i_head_snapc = NULL;
2678 }
2679 } else {
2680 BUG_ON(list_empty(&ci->i_dirty_item));
2681 }
2682 }
2683 spin_unlock(&mdsc->cap_dirty_lock);
2684 wake_up_all(&ci->i_cap_wq);
2685
2686out:
2687 spin_unlock(&ci->i_ceph_lock);
2688 if (drop)
2689 iput(inode);
2690}
2691
2692/*
2693 * Handle FLUSHSNAP_ACK. MDS has flushed snap data to disk and we can
2694 * throw away our cap_snap.
2695 *
2696 * Caller hold s_mutex.
2697 */
2698static void handle_cap_flushsnap_ack(struct inode *inode, u64 flush_tid,
2699 struct ceph_mds_caps *m,
2700 struct ceph_mds_session *session)
2701{
2702 struct ceph_inode_info *ci = ceph_inode(inode);
2703 u64 follows = le64_to_cpu(m->snap_follows);
2704 struct ceph_cap_snap *capsnap;
2705 int drop = 0;
2706
2707 dout("handle_cap_flushsnap_ack inode %p ci %p mds%d follows %lld\n",
2708 inode, ci, session->s_mds, follows);
2709
2710 spin_lock(&ci->i_ceph_lock);
2711 list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) {
2712 if (capsnap->follows == follows) {
2713 if (capsnap->flush_tid != flush_tid) {
2714 dout(" cap_snap %p follows %lld tid %lld !="
2715 " %lld\n", capsnap, follows,
2716 flush_tid, capsnap->flush_tid);
2717 break;
2718 }
2719 WARN_ON(capsnap->dirty_pages || capsnap->writing);
2720 dout(" removing %p cap_snap %p follows %lld\n",
2721 inode, capsnap, follows);
2722 ceph_put_snap_context(capsnap->context);
2723 list_del(&capsnap->ci_item);
2724 list_del(&capsnap->flushing_item);
2725 ceph_put_cap_snap(capsnap);
2726 drop = 1;
2727 break;
2728 } else {
2729 dout(" skipping cap_snap %p follows %lld\n",
2730 capsnap, capsnap->follows);
2731 }
2732 }
2733 spin_unlock(&ci->i_ceph_lock);
2734 if (drop)
2735 iput(inode);
2736}
2737
2738/*
2739 * Handle TRUNC from MDS, indicating file truncation.
2740 *
2741 * caller hold s_mutex.
2742 */
2743static void handle_cap_trunc(struct inode *inode,
2744 struct ceph_mds_caps *trunc,
2745 struct ceph_mds_session *session)
2746 __releases(ci->i_ceph_lock)
2747{
2748 struct ceph_inode_info *ci = ceph_inode(inode);
2749 int mds = session->s_mds;
2750 int seq = le32_to_cpu(trunc->seq);
2751 u32 truncate_seq = le32_to_cpu(trunc->truncate_seq);
2752 u64 truncate_size = le64_to_cpu(trunc->truncate_size);
2753 u64 size = le64_to_cpu(trunc->size);
2754 int implemented = 0;
2755 int dirty = __ceph_caps_dirty(ci);
2756 int issued = __ceph_caps_issued(ceph_inode(inode), &implemented);
2757 int queue_trunc = 0;
2758
2759 issued |= implemented | dirty;
2760
2761 dout("handle_cap_trunc inode %p mds%d seq %d to %lld seq %d\n",
2762 inode, mds, seq, truncate_size, truncate_seq);
2763 queue_trunc = ceph_fill_file_size(inode, issued,
2764 truncate_seq, truncate_size, size);
2765 spin_unlock(&ci->i_ceph_lock);
2766
2767 if (queue_trunc) {
2768 ceph_queue_vmtruncate(inode);
2769 ceph_fscache_invalidate(inode);
2770 }
2771}
2772
2773/*
2774 * Handle EXPORT from MDS. Cap is being migrated _from_ this mds to a
2775 * different one. If we are the most recent migration we've seen (as
2776 * indicated by mseq), make note of the migrating cap bits for the
2777 * duration (until we see the corresponding IMPORT).
2778 *
2779 * caller holds s_mutex
2780 */
2781static void handle_cap_export(struct inode *inode, struct ceph_mds_caps *ex,
2782 struct ceph_mds_cap_peer *ph,
2783 struct ceph_mds_session *session)
2784{
2785 struct ceph_mds_client *mdsc = ceph_inode_to_client(inode)->mdsc;
2786 struct ceph_mds_session *tsession = NULL;
2787 struct ceph_cap *cap, *tcap;
2788 struct ceph_inode_info *ci = ceph_inode(inode);
2789 u64 t_cap_id;
2790 unsigned mseq = le32_to_cpu(ex->migrate_seq);
2791 unsigned t_seq, t_mseq;
2792 int target, issued;
2793 int mds = session->s_mds;
2794
2795 if (ph) {
2796 t_cap_id = le64_to_cpu(ph->cap_id);
2797 t_seq = le32_to_cpu(ph->seq);
2798 t_mseq = le32_to_cpu(ph->mseq);
2799 target = le32_to_cpu(ph->mds);
2800 } else {
2801 t_cap_id = t_seq = t_mseq = 0;
2802 target = -1;
2803 }
2804
2805 dout("handle_cap_export inode %p ci %p mds%d mseq %d target %d\n",
2806 inode, ci, mds, mseq, target);
2807retry:
2808 spin_lock(&ci->i_ceph_lock);
2809 cap = __get_cap_for_mds(ci, mds);
2810 if (!cap)
2811 goto out_unlock;
2812
2813 if (target < 0) {
2814 __ceph_remove_cap(cap, false);
2815 goto out_unlock;
2816 }
2817
2818 /*
2819 * now we know we haven't received the cap import message yet
2820 * because the exported cap still exist.
2821 */
2822
2823 issued = cap->issued;
2824 WARN_ON(issued != cap->implemented);
2825
2826 tcap = __get_cap_for_mds(ci, target);
2827 if (tcap) {
2828 /* already have caps from the target */
2829 if (tcap->cap_id != t_cap_id ||
2830 ceph_seq_cmp(tcap->seq, t_seq) < 0) {
2831 dout(" updating import cap %p mds%d\n", tcap, target);
2832 tcap->cap_id = t_cap_id;
2833 tcap->seq = t_seq - 1;
2834 tcap->issue_seq = t_seq - 1;
2835 tcap->mseq = t_mseq;
2836 tcap->issued |= issued;
2837 tcap->implemented |= issued;
2838 if (cap == ci->i_auth_cap)
2839 ci->i_auth_cap = tcap;
2840 if (ci->i_flushing_caps && ci->i_auth_cap == tcap) {
2841 spin_lock(&mdsc->cap_dirty_lock);
2842 list_move_tail(&ci->i_flushing_item,
2843 &tcap->session->s_cap_flushing);
2844 spin_unlock(&mdsc->cap_dirty_lock);
2845 }
2846 }
2847 __ceph_remove_cap(cap, false);
2848 goto out_unlock;
2849 }
2850
2851 if (tsession) {
2852 int flag = (cap == ci->i_auth_cap) ? CEPH_CAP_FLAG_AUTH : 0;
2853 spin_unlock(&ci->i_ceph_lock);
2854 /* add placeholder for the export tagert */
2855 ceph_add_cap(inode, tsession, t_cap_id, -1, issued, 0,
2856 t_seq - 1, t_mseq, (u64)-1, flag, NULL);
2857 goto retry;
2858 }
2859
2860 spin_unlock(&ci->i_ceph_lock);
2861 mutex_unlock(&session->s_mutex);
2862
2863 /* open target session */
2864 tsession = ceph_mdsc_open_export_target_session(mdsc, target);
2865 if (!IS_ERR(tsession)) {
2866 if (mds > target) {
2867 mutex_lock(&session->s_mutex);
2868 mutex_lock_nested(&tsession->s_mutex,
2869 SINGLE_DEPTH_NESTING);
2870 } else {
2871 mutex_lock(&tsession->s_mutex);
2872 mutex_lock_nested(&session->s_mutex,
2873 SINGLE_DEPTH_NESTING);
2874 }
2875 ceph_add_cap_releases(mdsc, tsession);
2876 } else {
2877 WARN_ON(1);
2878 tsession = NULL;
2879 target = -1;
2880 }
2881 goto retry;
2882
2883out_unlock:
2884 spin_unlock(&ci->i_ceph_lock);
2885 mutex_unlock(&session->s_mutex);
2886 if (tsession) {
2887 mutex_unlock(&tsession->s_mutex);
2888 ceph_put_mds_session(tsession);
2889 }
2890}
2891
2892/*
2893 * Handle cap IMPORT. If there are temp bits from an older EXPORT,
2894 * clean them up.
2895 *
2896 * caller holds s_mutex.
2897 */
2898static void handle_cap_import(struct ceph_mds_client *mdsc,
2899 struct inode *inode, struct ceph_mds_caps *im,
2900 struct ceph_mds_cap_peer *ph,
2901 struct ceph_mds_session *session,
2902 void *snaptrace, int snaptrace_len)
2903{
2904 struct ceph_inode_info *ci = ceph_inode(inode);
2905 struct ceph_cap *cap;
2906 int mds = session->s_mds;
2907 unsigned issued = le32_to_cpu(im->caps);
2908 unsigned wanted = le32_to_cpu(im->wanted);
2909 unsigned seq = le32_to_cpu(im->seq);
2910 unsigned mseq = le32_to_cpu(im->migrate_seq);
2911 u64 realmino = le64_to_cpu(im->realm);
2912 u64 cap_id = le64_to_cpu(im->cap_id);
2913 u64 p_cap_id;
2914 int peer;
2915
2916 if (ph) {
2917 p_cap_id = le64_to_cpu(ph->cap_id);
2918 peer = le32_to_cpu(ph->mds);
2919 } else {
2920 p_cap_id = 0;
2921 peer = -1;
2922 }
2923
2924 dout("handle_cap_import inode %p ci %p mds%d mseq %d peer %d\n",
2925 inode, ci, mds, mseq, peer);
2926
2927 spin_lock(&ci->i_ceph_lock);
2928 cap = peer >= 0 ? __get_cap_for_mds(ci, peer) : NULL;
2929 if (cap && cap->cap_id == p_cap_id) {
2930 dout(" remove export cap %p mds%d flags %d\n",
2931 cap, peer, ph->flags);
2932 if ((ph->flags & CEPH_CAP_FLAG_AUTH) &&
2933 (cap->seq != le32_to_cpu(ph->seq) ||
2934 cap->mseq != le32_to_cpu(ph->mseq))) {
2935 pr_err("handle_cap_import: mismatched seq/mseq: "
2936 "ino (%llx.%llx) mds%d seq %d mseq %d "
2937 "importer mds%d has peer seq %d mseq %d\n",
2938 ceph_vinop(inode), peer, cap->seq,
2939 cap->mseq, mds, le32_to_cpu(ph->seq),
2940 le32_to_cpu(ph->mseq));
2941 }
2942 ci->i_cap_exporting_issued = cap->issued;
2943 __ceph_remove_cap(cap, (ph->flags & CEPH_CAP_FLAG_RELEASE));
2944 }
2945
2946 /* make sure we re-request max_size, if necessary */
2947 ci->i_wanted_max_size = 0;
2948 ci->i_requested_max_size = 0;
2949 spin_unlock(&ci->i_ceph_lock);
2950
2951 down_write(&mdsc->snap_rwsem);
2952 ceph_update_snap_trace(mdsc, snaptrace, snaptrace+snaptrace_len,
2953 false);
2954 downgrade_write(&mdsc->snap_rwsem);
2955 ceph_add_cap(inode, session, cap_id, -1,
2956 issued, wanted, seq, mseq, realmino, CEPH_CAP_FLAG_AUTH,
2957 NULL /* no caps context */);
2958 kick_flushing_inode_caps(mdsc, session, inode);
2959 up_read(&mdsc->snap_rwsem);
2960
2961}
2962
2963/*
2964 * Handle a caps message from the MDS.
2965 *
2966 * Identify the appropriate session, inode, and call the right handler
2967 * based on the cap op.
2968 */
2969void ceph_handle_caps(struct ceph_mds_session *session,
2970 struct ceph_msg *msg)
2971{
2972 struct ceph_mds_client *mdsc = session->s_mdsc;
2973 struct super_block *sb = mdsc->fsc->sb;
2974 struct inode *inode;
2975 struct ceph_inode_info *ci;
2976 struct ceph_cap *cap;
2977 struct ceph_mds_caps *h;
2978 struct ceph_mds_cap_peer *peer = NULL;
2979 int mds = session->s_mds;
2980 int op;
2981 u32 seq, mseq;
2982 struct ceph_vino vino;
2983 u64 cap_id;
2984 u64 size, max_size;
2985 u64 tid;
2986 void *snaptrace;
2987 size_t snaptrace_len;
2988 void *flock;
2989 void *end;
2990 u32 flock_len;
2991
2992 dout("handle_caps from mds%d\n", mds);
2993
2994 /* decode */
2995 end = msg->front.iov_base + msg->front.iov_len;
2996 tid = le64_to_cpu(msg->hdr.tid);
2997 if (msg->front.iov_len < sizeof(*h))
2998 goto bad;
2999 h = msg->front.iov_base;
3000 op = le32_to_cpu(h->op);
3001 vino.ino = le64_to_cpu(h->ino);
3002 vino.snap = CEPH_NOSNAP;
3003 cap_id = le64_to_cpu(h->cap_id);
3004 seq = le32_to_cpu(h->seq);
3005 mseq = le32_to_cpu(h->migrate_seq);
3006 size = le64_to_cpu(h->size);
3007 max_size = le64_to_cpu(h->max_size);
3008
3009 snaptrace = h + 1;
3010 snaptrace_len = le32_to_cpu(h->snap_trace_len);
3011
3012 if (le16_to_cpu(msg->hdr.version) >= 2) {
3013 void *p = snaptrace + snaptrace_len;
3014 ceph_decode_32_safe(&p, end, flock_len, bad);
3015 if (p + flock_len > end)
3016 goto bad;
3017 flock = p;
3018 } else {
3019 flock = NULL;
3020 flock_len = 0;
3021 }
3022
3023 if (le16_to_cpu(msg->hdr.version) >= 3) {
3024 if (op == CEPH_CAP_OP_IMPORT) {
3025 void *p = flock + flock_len;
3026 if (p + sizeof(*peer) > end)
3027 goto bad;
3028 peer = p;
3029 } else if (op == CEPH_CAP_OP_EXPORT) {
3030 /* recorded in unused fields */
3031 peer = (void *)&h->size;
3032 }
3033 }
3034
3035 mutex_lock(&session->s_mutex);
3036 session->s_seq++;
3037 dout(" mds%d seq %lld cap seq %u\n", session->s_mds, session->s_seq,
3038 (unsigned)seq);
3039
3040 if (op == CEPH_CAP_OP_IMPORT)
3041 ceph_add_cap_releases(mdsc, session);
3042
3043 /* lookup ino */
3044 inode = ceph_find_inode(sb, vino);
3045 ci = ceph_inode(inode);
3046 dout(" op %s ino %llx.%llx inode %p\n", ceph_cap_op_name(op), vino.ino,
3047 vino.snap, inode);
3048 if (!inode) {
3049 dout(" i don't have ino %llx\n", vino.ino);
3050
3051 if (op == CEPH_CAP_OP_IMPORT) {
3052 spin_lock(&session->s_cap_lock);
3053 __queue_cap_release(session, vino.ino, cap_id,
3054 mseq, seq);
3055 spin_unlock(&session->s_cap_lock);
3056 }
3057 goto flush_cap_releases;
3058 }
3059
3060 /* these will work even if we don't have a cap yet */
3061 switch (op) {
3062 case CEPH_CAP_OP_FLUSHSNAP_ACK:
3063 handle_cap_flushsnap_ack(inode, tid, h, session);
3064 goto done;
3065
3066 case CEPH_CAP_OP_EXPORT:
3067 handle_cap_export(inode, h, peer, session);
3068 goto done_unlocked;
3069
3070 case CEPH_CAP_OP_IMPORT:
3071 handle_cap_import(mdsc, inode, h, peer, session,
3072 snaptrace, snaptrace_len);
3073 }
3074
3075 /* the rest require a cap */
3076 spin_lock(&ci->i_ceph_lock);
3077 cap = __get_cap_for_mds(ceph_inode(inode), mds);
3078 if (!cap) {
3079 dout(" no cap on %p ino %llx.%llx from mds%d\n",
3080 inode, ceph_ino(inode), ceph_snap(inode), mds);
3081 spin_unlock(&ci->i_ceph_lock);
3082 goto flush_cap_releases;
3083 }
3084
3085 /* note that each of these drops i_ceph_lock for us */
3086 switch (op) {
3087 case CEPH_CAP_OP_REVOKE:
3088 case CEPH_CAP_OP_GRANT:
3089 case CEPH_CAP_OP_IMPORT:
3090 handle_cap_grant(inode, h, session, cap, msg->middle);
3091 goto done_unlocked;
3092
3093 case CEPH_CAP_OP_FLUSH_ACK:
3094 handle_cap_flush_ack(inode, tid, h, session, cap);
3095 break;
3096
3097 case CEPH_CAP_OP_TRUNC:
3098 handle_cap_trunc(inode, h, session);
3099 break;
3100
3101 default:
3102 spin_unlock(&ci->i_ceph_lock);
3103 pr_err("ceph_handle_caps: unknown cap op %d %s\n", op,
3104 ceph_cap_op_name(op));
3105 }
3106
3107 goto done;
3108
3109flush_cap_releases:
3110 /*
3111 * send any full release message to try to move things
3112 * along for the mds (who clearly thinks we still have this
3113 * cap).
3114 */
3115 ceph_add_cap_releases(mdsc, session);
3116 ceph_send_cap_releases(mdsc, session);
3117
3118done:
3119 mutex_unlock(&session->s_mutex);
3120done_unlocked:
3121 if (inode)
3122 iput(inode);
3123 return;
3124
3125bad:
3126 pr_err("ceph_handle_caps: corrupt message\n");
3127 ceph_msg_dump(msg);
3128 return;
3129}
3130
3131/*
3132 * Delayed work handler to process end of delayed cap release LRU list.
3133 */
3134void ceph_check_delayed_caps(struct ceph_mds_client *mdsc)
3135{
3136 struct ceph_inode_info *ci;
3137 int flags = CHECK_CAPS_NODELAY;
3138
3139 dout("check_delayed_caps\n");
3140 while (1) {
3141 spin_lock(&mdsc->cap_delay_lock);
3142 if (list_empty(&mdsc->cap_delay_list))
3143 break;
3144 ci = list_first_entry(&mdsc->cap_delay_list,
3145 struct ceph_inode_info,
3146 i_cap_delay_list);
3147 if ((ci->i_ceph_flags & CEPH_I_FLUSH) == 0 &&
3148 time_before(jiffies, ci->i_hold_caps_max))
3149 break;
3150 list_del_init(&ci->i_cap_delay_list);
3151 spin_unlock(&mdsc->cap_delay_lock);
3152 dout("check_delayed_caps on %p\n", &ci->vfs_inode);
3153 ceph_check_caps(ci, flags, NULL);
3154 }
3155 spin_unlock(&mdsc->cap_delay_lock);
3156}
3157
3158/*
3159 * Flush all dirty caps to the mds
3160 */
3161void ceph_flush_dirty_caps(struct ceph_mds_client *mdsc)
3162{
3163 struct ceph_inode_info *ci;
3164 struct inode *inode;
3165
3166 dout("flush_dirty_caps\n");
3167 spin_lock(&mdsc->cap_dirty_lock);
3168 while (!list_empty(&mdsc->cap_dirty)) {
3169 ci = list_first_entry(&mdsc->cap_dirty, struct ceph_inode_info,
3170 i_dirty_item);
3171 inode = &ci->vfs_inode;
3172 ihold(inode);
3173 dout("flush_dirty_caps %p\n", inode);
3174 spin_unlock(&mdsc->cap_dirty_lock);
3175 ceph_check_caps(ci, CHECK_CAPS_NODELAY|CHECK_CAPS_FLUSH, NULL);
3176 iput(inode);
3177 spin_lock(&mdsc->cap_dirty_lock);
3178 }
3179 spin_unlock(&mdsc->cap_dirty_lock);
3180 dout("flush_dirty_caps done\n");
3181}
3182
3183/*
3184 * Drop open file reference. If we were the last open file,
3185 * we may need to release capabilities to the MDS (or schedule
3186 * their delayed release).
3187 */
3188void ceph_put_fmode(struct ceph_inode_info *ci, int fmode)
3189{
3190 struct inode *inode = &ci->vfs_inode;
3191 int last = 0;
3192
3193 spin_lock(&ci->i_ceph_lock);
3194 dout("put_fmode %p fmode %d %d -> %d\n", inode, fmode,
3195 ci->i_nr_by_mode[fmode], ci->i_nr_by_mode[fmode]-1);
3196 BUG_ON(ci->i_nr_by_mode[fmode] == 0);
3197 if (--ci->i_nr_by_mode[fmode] == 0)
3198 last++;
3199 spin_unlock(&ci->i_ceph_lock);
3200
3201 if (last && ci->i_vino.snap == CEPH_NOSNAP)
3202 ceph_check_caps(ci, 0, NULL);
3203}
3204
3205/*
3206 * Helpers for embedding cap and dentry lease releases into mds
3207 * requests.
3208 *
3209 * @force is used by dentry_release (below) to force inclusion of a
3210 * record for the directory inode, even when there aren't any caps to
3211 * drop.
3212 */
3213int ceph_encode_inode_release(void **p, struct inode *inode,
3214 int mds, int drop, int unless, int force)
3215{
3216 struct ceph_inode_info *ci = ceph_inode(inode);
3217 struct ceph_cap *cap;
3218 struct ceph_mds_request_release *rel = *p;
3219 int used, dirty;
3220 int ret = 0;
3221
3222 spin_lock(&ci->i_ceph_lock);
3223 used = __ceph_caps_used(ci);
3224 dirty = __ceph_caps_dirty(ci);
3225
3226 dout("encode_inode_release %p mds%d used|dirty %s drop %s unless %s\n",
3227 inode, mds, ceph_cap_string(used|dirty), ceph_cap_string(drop),
3228 ceph_cap_string(unless));
3229
3230 /* only drop unused, clean caps */
3231 drop &= ~(used | dirty);
3232
3233 cap = __get_cap_for_mds(ci, mds);
3234 if (cap && __cap_is_valid(cap)) {
3235 if (force ||
3236 ((cap->issued & drop) &&
3237 (cap->issued & unless) == 0)) {
3238 if ((cap->issued & drop) &&
3239 (cap->issued & unless) == 0) {
3240 int wanted = __ceph_caps_wanted(ci);
3241 if ((ci->i_ceph_flags & CEPH_I_NODELAY) == 0)
3242 wanted |= cap->mds_wanted;
3243 dout("encode_inode_release %p cap %p "
3244 "%s -> %s, wanted %s -> %s\n", inode, cap,
3245 ceph_cap_string(cap->issued),
3246 ceph_cap_string(cap->issued & ~drop),
3247 ceph_cap_string(cap->mds_wanted),
3248 ceph_cap_string(wanted));
3249
3250 cap->issued &= ~drop;
3251 cap->implemented &= ~drop;
3252 cap->mds_wanted = wanted;
3253 } else {
3254 dout("encode_inode_release %p cap %p %s"
3255 " (force)\n", inode, cap,
3256 ceph_cap_string(cap->issued));
3257 }
3258
3259 rel->ino = cpu_to_le64(ceph_ino(inode));
3260 rel->cap_id = cpu_to_le64(cap->cap_id);
3261 rel->seq = cpu_to_le32(cap->seq);
3262 rel->issue_seq = cpu_to_le32(cap->issue_seq),
3263 rel->mseq = cpu_to_le32(cap->mseq);
3264 rel->caps = cpu_to_le32(cap->implemented);
3265 rel->wanted = cpu_to_le32(cap->mds_wanted);
3266 rel->dname_len = 0;
3267 rel->dname_seq = 0;
3268 *p += sizeof(*rel);
3269 ret = 1;
3270 } else {
3271 dout("encode_inode_release %p cap %p %s\n",
3272 inode, cap, ceph_cap_string(cap->issued));
3273 }
3274 }
3275 spin_unlock(&ci->i_ceph_lock);
3276 return ret;
3277}
3278
3279int ceph_encode_dentry_release(void **p, struct dentry *dentry,
3280 int mds, int drop, int unless)
3281{
3282 struct inode *dir = dentry->d_parent->d_inode;
3283 struct ceph_mds_request_release *rel = *p;
3284 struct ceph_dentry_info *di = ceph_dentry(dentry);
3285 int force = 0;
3286 int ret;
3287
3288 /*
3289 * force an record for the directory caps if we have a dentry lease.
3290 * this is racy (can't take i_ceph_lock and d_lock together), but it
3291 * doesn't have to be perfect; the mds will revoke anything we don't
3292 * release.
3293 */
3294 spin_lock(&dentry->d_lock);
3295 if (di->lease_session && di->lease_session->s_mds == mds)
3296 force = 1;
3297 spin_unlock(&dentry->d_lock);
3298
3299 ret = ceph_encode_inode_release(p, dir, mds, drop, unless, force);
3300
3301 spin_lock(&dentry->d_lock);
3302 if (ret && di->lease_session && di->lease_session->s_mds == mds) {
3303 dout("encode_dentry_release %p mds%d seq %d\n",
3304 dentry, mds, (int)di->lease_seq);
3305 rel->dname_len = cpu_to_le32(dentry->d_name.len);
3306 memcpy(*p, dentry->d_name.name, dentry->d_name.len);
3307 *p += dentry->d_name.len;
3308 rel->dname_seq = cpu_to_le32(di->lease_seq);
3309 __ceph_mdsc_drop_dentry_lease(dentry);
3310 }
3311 spin_unlock(&dentry->d_lock);
3312 return ret;
3313}
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 ci->i_hold_caps_max = round_jiffies(jiffies +
494 opt->caps_wanted_delay_max * HZ);
495 dout("__cap_set_timeouts %p %lu\n", &ci->netfs.inode,
496 ci->i_hold_caps_max - jiffies);
497}
498
499/*
500 * (Re)queue cap at the end of the delayed cap release list.
501 *
502 * If I_FLUSH is set, leave the inode at the front of the list.
503 *
504 * Caller holds i_ceph_lock
505 * -> we take mdsc->cap_delay_lock
506 */
507static void __cap_delay_requeue(struct ceph_mds_client *mdsc,
508 struct ceph_inode_info *ci)
509{
510 dout("__cap_delay_requeue %p flags 0x%lx at %lu\n", &ci->netfs.inode,
511 ci->i_ceph_flags, ci->i_hold_caps_max);
512 if (!mdsc->stopping) {
513 spin_lock(&mdsc->cap_delay_lock);
514 if (!list_empty(&ci->i_cap_delay_list)) {
515 if (ci->i_ceph_flags & CEPH_I_FLUSH)
516 goto no_change;
517 list_del_init(&ci->i_cap_delay_list);
518 }
519 __cap_set_timeouts(mdsc, ci);
520 list_add_tail(&ci->i_cap_delay_list, &mdsc->cap_delay_list);
521no_change:
522 spin_unlock(&mdsc->cap_delay_lock);
523 }
524}
525
526/*
527 * Queue an inode for immediate writeback. Mark inode with I_FLUSH,
528 * indicating we should send a cap message to flush dirty metadata
529 * asap, and move to the front of the delayed cap list.
530 */
531static void __cap_delay_requeue_front(struct ceph_mds_client *mdsc,
532 struct ceph_inode_info *ci)
533{
534 dout("__cap_delay_requeue_front %p\n", &ci->netfs.inode);
535 spin_lock(&mdsc->cap_delay_lock);
536 ci->i_ceph_flags |= CEPH_I_FLUSH;
537 if (!list_empty(&ci->i_cap_delay_list))
538 list_del_init(&ci->i_cap_delay_list);
539 list_add(&ci->i_cap_delay_list, &mdsc->cap_delay_list);
540 spin_unlock(&mdsc->cap_delay_lock);
541}
542
543/*
544 * Cancel delayed work on cap.
545 *
546 * Caller must hold i_ceph_lock.
547 */
548static void __cap_delay_cancel(struct ceph_mds_client *mdsc,
549 struct ceph_inode_info *ci)
550{
551 dout("__cap_delay_cancel %p\n", &ci->netfs.inode);
552 if (list_empty(&ci->i_cap_delay_list))
553 return;
554 spin_lock(&mdsc->cap_delay_lock);
555 list_del_init(&ci->i_cap_delay_list);
556 spin_unlock(&mdsc->cap_delay_lock);
557}
558
559/* Common issue checks for add_cap, handle_cap_grant. */
560static void __check_cap_issue(struct ceph_inode_info *ci, struct ceph_cap *cap,
561 unsigned issued)
562{
563 unsigned had = __ceph_caps_issued(ci, NULL);
564
565 lockdep_assert_held(&ci->i_ceph_lock);
566
567 /*
568 * Each time we receive FILE_CACHE anew, we increment
569 * i_rdcache_gen.
570 */
571 if (S_ISREG(ci->netfs.inode.i_mode) &&
572 (issued & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) &&
573 (had & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) == 0) {
574 ci->i_rdcache_gen++;
575 }
576
577 /*
578 * If FILE_SHARED is newly issued, mark dir not complete. We don't
579 * know what happened to this directory while we didn't have the cap.
580 * If FILE_SHARED is being revoked, also mark dir not complete. It
581 * stops on-going cached readdir.
582 */
583 if ((issued & CEPH_CAP_FILE_SHARED) != (had & CEPH_CAP_FILE_SHARED)) {
584 if (issued & CEPH_CAP_FILE_SHARED)
585 atomic_inc(&ci->i_shared_gen);
586 if (S_ISDIR(ci->netfs.inode.i_mode)) {
587 dout(" marking %p NOT complete\n", &ci->netfs.inode);
588 __ceph_dir_clear_complete(ci);
589 }
590 }
591
592 /* Wipe saved layout if we're losing DIR_CREATE caps */
593 if (S_ISDIR(ci->netfs.inode.i_mode) && (had & CEPH_CAP_DIR_CREATE) &&
594 !(issued & CEPH_CAP_DIR_CREATE)) {
595 ceph_put_string(rcu_dereference_raw(ci->i_cached_layout.pool_ns));
596 memset(&ci->i_cached_layout, 0, sizeof(ci->i_cached_layout));
597 }
598}
599
600/**
601 * change_auth_cap_ses - move inode to appropriate lists when auth caps change
602 * @ci: inode to be moved
603 * @session: new auth caps session
604 */
605void change_auth_cap_ses(struct ceph_inode_info *ci,
606 struct ceph_mds_session *session)
607{
608 lockdep_assert_held(&ci->i_ceph_lock);
609
610 if (list_empty(&ci->i_dirty_item) && list_empty(&ci->i_flushing_item))
611 return;
612
613 spin_lock(&session->s_mdsc->cap_dirty_lock);
614 if (!list_empty(&ci->i_dirty_item))
615 list_move(&ci->i_dirty_item, &session->s_cap_dirty);
616 if (!list_empty(&ci->i_flushing_item))
617 list_move_tail(&ci->i_flushing_item, &session->s_cap_flushing);
618 spin_unlock(&session->s_mdsc->cap_dirty_lock);
619}
620
621/*
622 * Add a capability under the given MDS session.
623 *
624 * Caller should hold session snap_rwsem (read) and ci->i_ceph_lock
625 *
626 * @fmode is the open file mode, if we are opening a file, otherwise
627 * it is < 0. (This is so we can atomically add the cap and add an
628 * open file reference to it.)
629 */
630void ceph_add_cap(struct inode *inode,
631 struct ceph_mds_session *session, u64 cap_id,
632 unsigned issued, unsigned wanted,
633 unsigned seq, unsigned mseq, u64 realmino, int flags,
634 struct ceph_cap **new_cap)
635{
636 struct ceph_mds_client *mdsc = ceph_inode_to_client(inode)->mdsc;
637 struct ceph_inode_info *ci = ceph_inode(inode);
638 struct ceph_cap *cap;
639 int mds = session->s_mds;
640 int actual_wanted;
641 u32 gen;
642
643 lockdep_assert_held(&ci->i_ceph_lock);
644
645 dout("add_cap %p mds%d cap %llx %s seq %d\n", inode,
646 session->s_mds, cap_id, ceph_cap_string(issued), seq);
647
648 gen = atomic_read(&session->s_cap_gen);
649
650 cap = __get_cap_for_mds(ci, mds);
651 if (!cap) {
652 cap = *new_cap;
653 *new_cap = NULL;
654
655 cap->issued = 0;
656 cap->implemented = 0;
657 cap->mds = mds;
658 cap->mds_wanted = 0;
659 cap->mseq = 0;
660
661 cap->ci = ci;
662 __insert_cap_node(ci, cap);
663
664 /* add to session cap list */
665 cap->session = session;
666 spin_lock(&session->s_cap_lock);
667 list_add_tail(&cap->session_caps, &session->s_caps);
668 session->s_nr_caps++;
669 atomic64_inc(&mdsc->metric.total_caps);
670 spin_unlock(&session->s_cap_lock);
671 } else {
672 spin_lock(&session->s_cap_lock);
673 list_move_tail(&cap->session_caps, &session->s_caps);
674 spin_unlock(&session->s_cap_lock);
675
676 if (cap->cap_gen < gen)
677 cap->issued = cap->implemented = CEPH_CAP_PIN;
678
679 /*
680 * auth mds of the inode changed. we received the cap export
681 * message, but still haven't received the cap import message.
682 * handle_cap_export() updated the new auth MDS' cap.
683 *
684 * "ceph_seq_cmp(seq, cap->seq) <= 0" means we are processing
685 * a message that was send before the cap import message. So
686 * don't remove caps.
687 */
688 if (ceph_seq_cmp(seq, cap->seq) <= 0) {
689 WARN_ON(cap != ci->i_auth_cap);
690 WARN_ON(cap->cap_id != cap_id);
691 seq = cap->seq;
692 mseq = cap->mseq;
693 issued |= cap->issued;
694 flags |= CEPH_CAP_FLAG_AUTH;
695 }
696 }
697
698 if (!ci->i_snap_realm ||
699 ((flags & CEPH_CAP_FLAG_AUTH) &&
700 realmino != (u64)-1 && ci->i_snap_realm->ino != realmino)) {
701 /*
702 * add this inode to the appropriate snap realm
703 */
704 struct ceph_snap_realm *realm = ceph_lookup_snap_realm(mdsc,
705 realmino);
706 if (realm)
707 ceph_change_snap_realm(inode, realm);
708 else
709 WARN(1, "%s: couldn't find snap realm 0x%llx (ino 0x%llx oldrealm 0x%llx)\n",
710 __func__, realmino, ci->i_vino.ino,
711 ci->i_snap_realm ? ci->i_snap_realm->ino : 0);
712 }
713
714 __check_cap_issue(ci, cap, issued);
715
716 /*
717 * If we are issued caps we don't want, or the mds' wanted
718 * value appears to be off, queue a check so we'll release
719 * later and/or update the mds wanted value.
720 */
721 actual_wanted = __ceph_caps_wanted(ci);
722 if ((wanted & ~actual_wanted) ||
723 (issued & ~actual_wanted & CEPH_CAP_ANY_WR)) {
724 dout(" issued %s, mds wanted %s, actual %s, queueing\n",
725 ceph_cap_string(issued), ceph_cap_string(wanted),
726 ceph_cap_string(actual_wanted));
727 __cap_delay_requeue(mdsc, ci);
728 }
729
730 if (flags & CEPH_CAP_FLAG_AUTH) {
731 if (!ci->i_auth_cap ||
732 ceph_seq_cmp(ci->i_auth_cap->mseq, mseq) < 0) {
733 if (ci->i_auth_cap &&
734 ci->i_auth_cap->session != cap->session)
735 change_auth_cap_ses(ci, cap->session);
736 ci->i_auth_cap = cap;
737 cap->mds_wanted = wanted;
738 }
739 } else {
740 WARN_ON(ci->i_auth_cap == cap);
741 }
742
743 dout("add_cap inode %p (%llx.%llx) cap %p %s now %s seq %d mds%d\n",
744 inode, ceph_vinop(inode), cap, ceph_cap_string(issued),
745 ceph_cap_string(issued|cap->issued), seq, mds);
746 cap->cap_id = cap_id;
747 cap->issued = issued;
748 cap->implemented |= issued;
749 if (ceph_seq_cmp(mseq, cap->mseq) > 0)
750 cap->mds_wanted = wanted;
751 else
752 cap->mds_wanted |= wanted;
753 cap->seq = seq;
754 cap->issue_seq = seq;
755 cap->mseq = mseq;
756 cap->cap_gen = gen;
757 wake_up_all(&ci->i_cap_wq);
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 gen = atomic_read(&cap->session->s_cap_gen);
771 ttl = cap->session->s_cap_ttl;
772
773 if (cap->cap_gen < gen || time_after_eq(jiffies, ttl)) {
774 dout("__cap_is_valid %p cap %p issued %s "
775 "but STALE (gen %u vs %u)\n", &cap->ci->netfs.inode,
776 cap, ceph_cap_string(cap->issued), cap->cap_gen, gen);
777 return 0;
778 }
779
780 return 1;
781}
782
783/*
784 * Return set of valid cap bits issued to us. Note that caps time
785 * out, and may be invalidated in bulk if the client session times out
786 * and session->s_cap_gen is bumped.
787 */
788int __ceph_caps_issued(struct ceph_inode_info *ci, int *implemented)
789{
790 int have = ci->i_snap_caps;
791 struct ceph_cap *cap;
792 struct rb_node *p;
793
794 if (implemented)
795 *implemented = 0;
796 for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
797 cap = rb_entry(p, struct ceph_cap, ci_node);
798 if (!__cap_is_valid(cap))
799 continue;
800 dout("__ceph_caps_issued %p cap %p issued %s\n",
801 &ci->netfs.inode, cap, ceph_cap_string(cap->issued));
802 have |= cap->issued;
803 if (implemented)
804 *implemented |= cap->implemented;
805 }
806 /*
807 * exclude caps issued by non-auth MDS, but are been revoking
808 * by the auth MDS. The non-auth MDS should be revoking/exporting
809 * these caps, but the message is delayed.
810 */
811 if (ci->i_auth_cap) {
812 cap = ci->i_auth_cap;
813 have &= ~cap->implemented | cap->issued;
814 }
815 return have;
816}
817
818/*
819 * Get cap bits issued by caps other than @ocap
820 */
821int __ceph_caps_issued_other(struct ceph_inode_info *ci, struct ceph_cap *ocap)
822{
823 int have = ci->i_snap_caps;
824 struct ceph_cap *cap;
825 struct rb_node *p;
826
827 for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
828 cap = rb_entry(p, struct ceph_cap, ci_node);
829 if (cap == ocap)
830 continue;
831 if (!__cap_is_valid(cap))
832 continue;
833 have |= cap->issued;
834 }
835 return have;
836}
837
838/*
839 * Move a cap to the end of the LRU (oldest caps at list head, newest
840 * at list tail).
841 */
842static void __touch_cap(struct ceph_cap *cap)
843{
844 struct ceph_mds_session *s = cap->session;
845
846 spin_lock(&s->s_cap_lock);
847 if (!s->s_cap_iterator) {
848 dout("__touch_cap %p cap %p mds%d\n", &cap->ci->netfs.inode, cap,
849 s->s_mds);
850 list_move_tail(&cap->session_caps, &s->s_caps);
851 } else {
852 dout("__touch_cap %p cap %p mds%d NOP, iterating over caps\n",
853 &cap->ci->netfs.inode, cap, s->s_mds);
854 }
855 spin_unlock(&s->s_cap_lock);
856}
857
858/*
859 * Check if we hold the given mask. If so, move the cap(s) to the
860 * front of their respective LRUs. (This is the preferred way for
861 * callers to check for caps they want.)
862 */
863int __ceph_caps_issued_mask(struct ceph_inode_info *ci, int mask, int touch)
864{
865 struct ceph_cap *cap;
866 struct rb_node *p;
867 int have = ci->i_snap_caps;
868
869 if ((have & mask) == mask) {
870 dout("__ceph_caps_issued_mask ino 0x%llx snap issued %s"
871 " (mask %s)\n", ceph_ino(&ci->netfs.inode),
872 ceph_cap_string(have),
873 ceph_cap_string(mask));
874 return 1;
875 }
876
877 for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
878 cap = rb_entry(p, struct ceph_cap, ci_node);
879 if (!__cap_is_valid(cap))
880 continue;
881 if ((cap->issued & mask) == mask) {
882 dout("__ceph_caps_issued_mask ino 0x%llx cap %p issued %s"
883 " (mask %s)\n", ceph_ino(&ci->netfs.inode), cap,
884 ceph_cap_string(cap->issued),
885 ceph_cap_string(mask));
886 if (touch)
887 __touch_cap(cap);
888 return 1;
889 }
890
891 /* does a combination of caps satisfy mask? */
892 have |= cap->issued;
893 if ((have & mask) == mask) {
894 dout("__ceph_caps_issued_mask ino 0x%llx combo issued %s"
895 " (mask %s)\n", ceph_ino(&ci->netfs.inode),
896 ceph_cap_string(cap->issued),
897 ceph_cap_string(mask));
898 if (touch) {
899 struct rb_node *q;
900
901 /* touch this + preceding caps */
902 __touch_cap(cap);
903 for (q = rb_first(&ci->i_caps); q != p;
904 q = rb_next(q)) {
905 cap = rb_entry(q, struct ceph_cap,
906 ci_node);
907 if (!__cap_is_valid(cap))
908 continue;
909 if (cap->issued & mask)
910 __touch_cap(cap);
911 }
912 }
913 return 1;
914 }
915 }
916
917 return 0;
918}
919
920int __ceph_caps_issued_mask_metric(struct ceph_inode_info *ci, int mask,
921 int touch)
922{
923 struct ceph_fs_client *fsc = ceph_sb_to_client(ci->netfs.inode.i_sb);
924 int r;
925
926 r = __ceph_caps_issued_mask(ci, mask, touch);
927 if (r)
928 ceph_update_cap_hit(&fsc->mdsc->metric);
929 else
930 ceph_update_cap_mis(&fsc->mdsc->metric);
931 return r;
932}
933
934/*
935 * Return true if mask caps are currently being revoked by an MDS.
936 */
937int __ceph_caps_revoking_other(struct ceph_inode_info *ci,
938 struct ceph_cap *ocap, int mask)
939{
940 struct ceph_cap *cap;
941 struct rb_node *p;
942
943 for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
944 cap = rb_entry(p, struct ceph_cap, ci_node);
945 if (cap != ocap &&
946 (cap->implemented & ~cap->issued & mask))
947 return 1;
948 }
949 return 0;
950}
951
952int ceph_caps_revoking(struct ceph_inode_info *ci, int mask)
953{
954 struct inode *inode = &ci->netfs.inode;
955 int ret;
956
957 spin_lock(&ci->i_ceph_lock);
958 ret = __ceph_caps_revoking_other(ci, NULL, mask);
959 spin_unlock(&ci->i_ceph_lock);
960 dout("ceph_caps_revoking %p %s = %d\n", inode,
961 ceph_cap_string(mask), ret);
962 return ret;
963}
964
965int __ceph_caps_used(struct ceph_inode_info *ci)
966{
967 int used = 0;
968 if (ci->i_pin_ref)
969 used |= CEPH_CAP_PIN;
970 if (ci->i_rd_ref)
971 used |= CEPH_CAP_FILE_RD;
972 if (ci->i_rdcache_ref ||
973 (S_ISREG(ci->netfs.inode.i_mode) &&
974 ci->netfs.inode.i_data.nrpages))
975 used |= CEPH_CAP_FILE_CACHE;
976 if (ci->i_wr_ref)
977 used |= CEPH_CAP_FILE_WR;
978 if (ci->i_wb_ref || ci->i_wrbuffer_ref)
979 used |= CEPH_CAP_FILE_BUFFER;
980 if (ci->i_fx_ref)
981 used |= CEPH_CAP_FILE_EXCL;
982 return used;
983}
984
985#define FMODE_WAIT_BIAS 1000
986
987/*
988 * wanted, by virtue of open file modes
989 */
990int __ceph_caps_file_wanted(struct ceph_inode_info *ci)
991{
992 const int PIN_SHIFT = ffs(CEPH_FILE_MODE_PIN);
993 const int RD_SHIFT = ffs(CEPH_FILE_MODE_RD);
994 const int WR_SHIFT = ffs(CEPH_FILE_MODE_WR);
995 const int LAZY_SHIFT = ffs(CEPH_FILE_MODE_LAZY);
996 struct ceph_mount_options *opt =
997 ceph_inode_to_client(&ci->netfs.inode)->mount_options;
998 unsigned long used_cutoff = jiffies - opt->caps_wanted_delay_max * HZ;
999 unsigned long idle_cutoff = jiffies - opt->caps_wanted_delay_min * HZ;
1000
1001 if (S_ISDIR(ci->netfs.inode.i_mode)) {
1002 int want = 0;
1003
1004 /* use used_cutoff here, to keep dir's wanted caps longer */
1005 if (ci->i_nr_by_mode[RD_SHIFT] > 0 ||
1006 time_after(ci->i_last_rd, used_cutoff))
1007 want |= CEPH_CAP_ANY_SHARED;
1008
1009 if (ci->i_nr_by_mode[WR_SHIFT] > 0 ||
1010 time_after(ci->i_last_wr, used_cutoff)) {
1011 want |= CEPH_CAP_ANY_SHARED | CEPH_CAP_FILE_EXCL;
1012 if (opt->flags & CEPH_MOUNT_OPT_ASYNC_DIROPS)
1013 want |= CEPH_CAP_ANY_DIR_OPS;
1014 }
1015
1016 if (want || ci->i_nr_by_mode[PIN_SHIFT] > 0)
1017 want |= CEPH_CAP_PIN;
1018
1019 return want;
1020 } else {
1021 int bits = 0;
1022
1023 if (ci->i_nr_by_mode[RD_SHIFT] > 0) {
1024 if (ci->i_nr_by_mode[RD_SHIFT] >= FMODE_WAIT_BIAS ||
1025 time_after(ci->i_last_rd, used_cutoff))
1026 bits |= 1 << RD_SHIFT;
1027 } else if (time_after(ci->i_last_rd, idle_cutoff)) {
1028 bits |= 1 << RD_SHIFT;
1029 }
1030
1031 if (ci->i_nr_by_mode[WR_SHIFT] > 0) {
1032 if (ci->i_nr_by_mode[WR_SHIFT] >= FMODE_WAIT_BIAS ||
1033 time_after(ci->i_last_wr, used_cutoff))
1034 bits |= 1 << WR_SHIFT;
1035 } else if (time_after(ci->i_last_wr, idle_cutoff)) {
1036 bits |= 1 << WR_SHIFT;
1037 }
1038
1039 /* check lazyio only when read/write is wanted */
1040 if ((bits & (CEPH_FILE_MODE_RDWR << 1)) &&
1041 ci->i_nr_by_mode[LAZY_SHIFT] > 0)
1042 bits |= 1 << LAZY_SHIFT;
1043
1044 return bits ? ceph_caps_for_mode(bits >> 1) : 0;
1045 }
1046}
1047
1048/*
1049 * wanted, by virtue of open file modes AND cap refs (buffered/cached data)
1050 */
1051int __ceph_caps_wanted(struct ceph_inode_info *ci)
1052{
1053 int w = __ceph_caps_file_wanted(ci) | __ceph_caps_used(ci);
1054 if (S_ISDIR(ci->netfs.inode.i_mode)) {
1055 /* we want EXCL if holding caps of dir ops */
1056 if (w & CEPH_CAP_ANY_DIR_OPS)
1057 w |= CEPH_CAP_FILE_EXCL;
1058 } else {
1059 /* we want EXCL if dirty data */
1060 if (w & CEPH_CAP_FILE_BUFFER)
1061 w |= CEPH_CAP_FILE_EXCL;
1062 }
1063 return w;
1064}
1065
1066/*
1067 * Return caps we have registered with the MDS(s) as 'wanted'.
1068 */
1069int __ceph_caps_mds_wanted(struct ceph_inode_info *ci, bool check)
1070{
1071 struct ceph_cap *cap;
1072 struct rb_node *p;
1073 int mds_wanted = 0;
1074
1075 for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
1076 cap = rb_entry(p, struct ceph_cap, ci_node);
1077 if (check && !__cap_is_valid(cap))
1078 continue;
1079 if (cap == ci->i_auth_cap)
1080 mds_wanted |= cap->mds_wanted;
1081 else
1082 mds_wanted |= (cap->mds_wanted & ~CEPH_CAP_ANY_FILE_WR);
1083 }
1084 return mds_wanted;
1085}
1086
1087int ceph_is_any_caps(struct inode *inode)
1088{
1089 struct ceph_inode_info *ci = ceph_inode(inode);
1090 int ret;
1091
1092 spin_lock(&ci->i_ceph_lock);
1093 ret = __ceph_is_any_real_caps(ci);
1094 spin_unlock(&ci->i_ceph_lock);
1095
1096 return ret;
1097}
1098
1099/*
1100 * Remove a cap. Take steps to deal with a racing iterate_session_caps.
1101 *
1102 * caller should hold i_ceph_lock.
1103 * caller will not hold session s_mutex if called from destroy_inode.
1104 */
1105void __ceph_remove_cap(struct ceph_cap *cap, bool queue_release)
1106{
1107 struct ceph_mds_session *session = cap->session;
1108 struct ceph_inode_info *ci = cap->ci;
1109 struct ceph_mds_client *mdsc;
1110 int removed = 0;
1111
1112 /* 'ci' being NULL means the remove have already occurred */
1113 if (!ci) {
1114 dout("%s: cap inode is NULL\n", __func__);
1115 return;
1116 }
1117
1118 lockdep_assert_held(&ci->i_ceph_lock);
1119
1120 dout("__ceph_remove_cap %p from %p\n", cap, &ci->netfs.inode);
1121
1122 mdsc = ceph_inode_to_client(&ci->netfs.inode)->mdsc;
1123
1124 /* remove from inode's cap rbtree, and clear auth cap */
1125 rb_erase(&cap->ci_node, &ci->i_caps);
1126 if (ci->i_auth_cap == cap)
1127 ci->i_auth_cap = NULL;
1128
1129 /* remove from session list */
1130 spin_lock(&session->s_cap_lock);
1131 if (session->s_cap_iterator == cap) {
1132 /* not yet, we are iterating over this very cap */
1133 dout("__ceph_remove_cap delaying %p removal from session %p\n",
1134 cap, cap->session);
1135 } else {
1136 list_del_init(&cap->session_caps);
1137 session->s_nr_caps--;
1138 atomic64_dec(&mdsc->metric.total_caps);
1139 cap->session = NULL;
1140 removed = 1;
1141 }
1142 /* protect backpointer with s_cap_lock: see iterate_session_caps */
1143 cap->ci = NULL;
1144
1145 /*
1146 * s_cap_reconnect is protected by s_cap_lock. no one changes
1147 * s_cap_gen while session is in the reconnect state.
1148 */
1149 if (queue_release &&
1150 (!session->s_cap_reconnect ||
1151 cap->cap_gen == atomic_read(&session->s_cap_gen))) {
1152 cap->queue_release = 1;
1153 if (removed) {
1154 __ceph_queue_cap_release(session, cap);
1155 removed = 0;
1156 }
1157 } else {
1158 cap->queue_release = 0;
1159 }
1160 cap->cap_ino = ci->i_vino.ino;
1161
1162 spin_unlock(&session->s_cap_lock);
1163
1164 if (removed)
1165 ceph_put_cap(mdsc, cap);
1166
1167 if (!__ceph_is_any_real_caps(ci)) {
1168 /* when reconnect denied, we remove session caps forcibly,
1169 * i_wr_ref can be non-zero. If there are ongoing write,
1170 * keep i_snap_realm.
1171 */
1172 if (ci->i_wr_ref == 0 && ci->i_snap_realm)
1173 ceph_change_snap_realm(&ci->netfs.inode, NULL);
1174
1175 __cap_delay_cancel(mdsc, ci);
1176 }
1177}
1178
1179void ceph_remove_cap(struct ceph_cap *cap, bool queue_release)
1180{
1181 struct ceph_inode_info *ci = cap->ci;
1182 struct ceph_fs_client *fsc;
1183
1184 /* 'ci' being NULL means the remove have already occurred */
1185 if (!ci) {
1186 dout("%s: cap inode is NULL\n", __func__);
1187 return;
1188 }
1189
1190 lockdep_assert_held(&ci->i_ceph_lock);
1191
1192 fsc = ceph_inode_to_client(&ci->netfs.inode);
1193 WARN_ON_ONCE(ci->i_auth_cap == cap &&
1194 !list_empty(&ci->i_dirty_item) &&
1195 !fsc->blocklisted &&
1196 !ceph_inode_is_shutdown(&ci->netfs.inode));
1197
1198 __ceph_remove_cap(cap, queue_release);
1199}
1200
1201struct cap_msg_args {
1202 struct ceph_mds_session *session;
1203 u64 ino, cid, follows;
1204 u64 flush_tid, oldest_flush_tid, size, max_size;
1205 u64 xattr_version;
1206 u64 change_attr;
1207 struct ceph_buffer *xattr_buf;
1208 struct ceph_buffer *old_xattr_buf;
1209 struct timespec64 atime, mtime, ctime, btime;
1210 int op, caps, wanted, dirty;
1211 u32 seq, issue_seq, mseq, time_warp_seq;
1212 u32 flags;
1213 kuid_t uid;
1214 kgid_t gid;
1215 umode_t mode;
1216 bool inline_data;
1217 bool wake;
1218};
1219
1220/*
1221 * cap struct size + flock buffer size + inline version + inline data size +
1222 * osd_epoch_barrier + oldest_flush_tid
1223 */
1224#define CAP_MSG_SIZE (sizeof(struct ceph_mds_caps) + \
1225 4 + 8 + 4 + 4 + 8 + 4 + 4 + 4 + 8 + 8 + 4)
1226
1227/* Marshal up the cap msg to the MDS */
1228static void encode_cap_msg(struct ceph_msg *msg, struct cap_msg_args *arg)
1229{
1230 struct ceph_mds_caps *fc;
1231 void *p;
1232 struct ceph_osd_client *osdc = &arg->session->s_mdsc->fsc->client->osdc;
1233
1234 dout("%s %s %llx %llx caps %s wanted %s dirty %s seq %u/%u tid %llu/%llu mseq %u follows %lld size %llu/%llu xattr_ver %llu xattr_len %d\n",
1235 __func__, ceph_cap_op_name(arg->op), arg->cid, arg->ino,
1236 ceph_cap_string(arg->caps), ceph_cap_string(arg->wanted),
1237 ceph_cap_string(arg->dirty), arg->seq, arg->issue_seq,
1238 arg->flush_tid, arg->oldest_flush_tid, arg->mseq, arg->follows,
1239 arg->size, arg->max_size, arg->xattr_version,
1240 arg->xattr_buf ? (int)arg->xattr_buf->vec.iov_len : 0);
1241
1242 msg->hdr.version = cpu_to_le16(10);
1243 msg->hdr.tid = cpu_to_le64(arg->flush_tid);
1244
1245 fc = msg->front.iov_base;
1246 memset(fc, 0, sizeof(*fc));
1247
1248 fc->cap_id = cpu_to_le64(arg->cid);
1249 fc->op = cpu_to_le32(arg->op);
1250 fc->seq = cpu_to_le32(arg->seq);
1251 fc->issue_seq = cpu_to_le32(arg->issue_seq);
1252 fc->migrate_seq = cpu_to_le32(arg->mseq);
1253 fc->caps = cpu_to_le32(arg->caps);
1254 fc->wanted = cpu_to_le32(arg->wanted);
1255 fc->dirty = cpu_to_le32(arg->dirty);
1256 fc->ino = cpu_to_le64(arg->ino);
1257 fc->snap_follows = cpu_to_le64(arg->follows);
1258
1259 fc->size = cpu_to_le64(arg->size);
1260 fc->max_size = cpu_to_le64(arg->max_size);
1261 ceph_encode_timespec64(&fc->mtime, &arg->mtime);
1262 ceph_encode_timespec64(&fc->atime, &arg->atime);
1263 ceph_encode_timespec64(&fc->ctime, &arg->ctime);
1264 fc->time_warp_seq = cpu_to_le32(arg->time_warp_seq);
1265
1266 fc->uid = cpu_to_le32(from_kuid(&init_user_ns, arg->uid));
1267 fc->gid = cpu_to_le32(from_kgid(&init_user_ns, arg->gid));
1268 fc->mode = cpu_to_le32(arg->mode);
1269
1270 fc->xattr_version = cpu_to_le64(arg->xattr_version);
1271 if (arg->xattr_buf) {
1272 msg->middle = ceph_buffer_get(arg->xattr_buf);
1273 fc->xattr_len = cpu_to_le32(arg->xattr_buf->vec.iov_len);
1274 msg->hdr.middle_len = cpu_to_le32(arg->xattr_buf->vec.iov_len);
1275 }
1276
1277 p = fc + 1;
1278 /* flock buffer size (version 2) */
1279 ceph_encode_32(&p, 0);
1280 /* inline version (version 4) */
1281 ceph_encode_64(&p, arg->inline_data ? 0 : CEPH_INLINE_NONE);
1282 /* inline data size */
1283 ceph_encode_32(&p, 0);
1284 /*
1285 * osd_epoch_barrier (version 5)
1286 * The epoch_barrier is protected osdc->lock, so READ_ONCE here in
1287 * case it was recently changed
1288 */
1289 ceph_encode_32(&p, READ_ONCE(osdc->epoch_barrier));
1290 /* oldest_flush_tid (version 6) */
1291 ceph_encode_64(&p, arg->oldest_flush_tid);
1292
1293 /*
1294 * caller_uid/caller_gid (version 7)
1295 *
1296 * Currently, we don't properly track which caller dirtied the caps
1297 * last, and force a flush of them when there is a conflict. For now,
1298 * just set this to 0:0, to emulate how the MDS has worked up to now.
1299 */
1300 ceph_encode_32(&p, 0);
1301 ceph_encode_32(&p, 0);
1302
1303 /* pool namespace (version 8) (mds always ignores this) */
1304 ceph_encode_32(&p, 0);
1305
1306 /* btime and change_attr (version 9) */
1307 ceph_encode_timespec64(p, &arg->btime);
1308 p += sizeof(struct ceph_timespec);
1309 ceph_encode_64(&p, arg->change_attr);
1310
1311 /* Advisory flags (version 10) */
1312 ceph_encode_32(&p, arg->flags);
1313}
1314
1315/*
1316 * Queue cap releases when an inode is dropped from our cache.
1317 */
1318void __ceph_remove_caps(struct ceph_inode_info *ci)
1319{
1320 struct rb_node *p;
1321
1322 /* lock i_ceph_lock, because ceph_d_revalidate(..., LOOKUP_RCU)
1323 * may call __ceph_caps_issued_mask() on a freeing inode. */
1324 spin_lock(&ci->i_ceph_lock);
1325 p = rb_first(&ci->i_caps);
1326 while (p) {
1327 struct ceph_cap *cap = rb_entry(p, struct ceph_cap, ci_node);
1328 p = rb_next(p);
1329 ceph_remove_cap(cap, true);
1330 }
1331 spin_unlock(&ci->i_ceph_lock);
1332}
1333
1334/*
1335 * Prepare to send a cap message to an MDS. Update the cap state, and populate
1336 * the arg struct with the parameters that will need to be sent. This should
1337 * be done under the i_ceph_lock to guard against changes to cap state.
1338 *
1339 * Make note of max_size reported/requested from mds, revoked caps
1340 * that have now been implemented.
1341 */
1342static void __prep_cap(struct cap_msg_args *arg, struct ceph_cap *cap,
1343 int op, int flags, int used, int want, int retain,
1344 int flushing, u64 flush_tid, u64 oldest_flush_tid)
1345{
1346 struct ceph_inode_info *ci = cap->ci;
1347 struct inode *inode = &ci->netfs.inode;
1348 int held, revoking;
1349
1350 lockdep_assert_held(&ci->i_ceph_lock);
1351
1352 held = cap->issued | cap->implemented;
1353 revoking = cap->implemented & ~cap->issued;
1354 retain &= ~revoking;
1355
1356 dout("%s %p cap %p session %p %s -> %s (revoking %s)\n",
1357 __func__, inode, cap, cap->session,
1358 ceph_cap_string(held), ceph_cap_string(held & retain),
1359 ceph_cap_string(revoking));
1360 BUG_ON((retain & CEPH_CAP_PIN) == 0);
1361
1362 ci->i_ceph_flags &= ~CEPH_I_FLUSH;
1363
1364 cap->issued &= retain; /* drop bits we don't want */
1365 /*
1366 * Wake up any waiters on wanted -> needed transition. This is due to
1367 * the weird transition from buffered to sync IO... we need to flush
1368 * dirty pages _before_ allowing sync writes to avoid reordering.
1369 */
1370 arg->wake = cap->implemented & ~cap->issued;
1371 cap->implemented &= cap->issued | used;
1372 cap->mds_wanted = want;
1373
1374 arg->session = cap->session;
1375 arg->ino = ceph_vino(inode).ino;
1376 arg->cid = cap->cap_id;
1377 arg->follows = flushing ? ci->i_head_snapc->seq : 0;
1378 arg->flush_tid = flush_tid;
1379 arg->oldest_flush_tid = oldest_flush_tid;
1380
1381 arg->size = i_size_read(inode);
1382 ci->i_reported_size = arg->size;
1383 arg->max_size = ci->i_wanted_max_size;
1384 if (cap == ci->i_auth_cap) {
1385 if (want & CEPH_CAP_ANY_FILE_WR)
1386 ci->i_requested_max_size = arg->max_size;
1387 else
1388 ci->i_requested_max_size = 0;
1389 }
1390
1391 if (flushing & CEPH_CAP_XATTR_EXCL) {
1392 arg->old_xattr_buf = __ceph_build_xattrs_blob(ci);
1393 arg->xattr_version = ci->i_xattrs.version;
1394 arg->xattr_buf = ci->i_xattrs.blob;
1395 } else {
1396 arg->xattr_buf = NULL;
1397 arg->old_xattr_buf = NULL;
1398 }
1399
1400 arg->mtime = inode->i_mtime;
1401 arg->atime = inode->i_atime;
1402 arg->ctime = inode->i_ctime;
1403 arg->btime = ci->i_btime;
1404 arg->change_attr = inode_peek_iversion_raw(inode);
1405
1406 arg->op = op;
1407 arg->caps = cap->implemented;
1408 arg->wanted = want;
1409 arg->dirty = flushing;
1410
1411 arg->seq = cap->seq;
1412 arg->issue_seq = cap->issue_seq;
1413 arg->mseq = cap->mseq;
1414 arg->time_warp_seq = ci->i_time_warp_seq;
1415
1416 arg->uid = inode->i_uid;
1417 arg->gid = inode->i_gid;
1418 arg->mode = inode->i_mode;
1419
1420 arg->inline_data = ci->i_inline_version != CEPH_INLINE_NONE;
1421 if (!(flags & CEPH_CLIENT_CAPS_PENDING_CAPSNAP) &&
1422 !list_empty(&ci->i_cap_snaps)) {
1423 struct ceph_cap_snap *capsnap;
1424 list_for_each_entry_reverse(capsnap, &ci->i_cap_snaps, ci_item) {
1425 if (capsnap->cap_flush.tid)
1426 break;
1427 if (capsnap->need_flush) {
1428 flags |= CEPH_CLIENT_CAPS_PENDING_CAPSNAP;
1429 break;
1430 }
1431 }
1432 }
1433 arg->flags = flags;
1434}
1435
1436/*
1437 * Send a cap msg on the given inode.
1438 *
1439 * Caller should hold snap_rwsem (read), s_mutex.
1440 */
1441static void __send_cap(struct cap_msg_args *arg, struct ceph_inode_info *ci)
1442{
1443 struct ceph_msg *msg;
1444 struct inode *inode = &ci->netfs.inode;
1445
1446 msg = ceph_msg_new(CEPH_MSG_CLIENT_CAPS, CAP_MSG_SIZE, GFP_NOFS, false);
1447 if (!msg) {
1448 pr_err("error allocating cap msg: ino (%llx.%llx) flushing %s tid %llu, requeuing cap.\n",
1449 ceph_vinop(inode), ceph_cap_string(arg->dirty),
1450 arg->flush_tid);
1451 spin_lock(&ci->i_ceph_lock);
1452 __cap_delay_requeue(arg->session->s_mdsc, ci);
1453 spin_unlock(&ci->i_ceph_lock);
1454 return;
1455 }
1456
1457 encode_cap_msg(msg, arg);
1458 ceph_con_send(&arg->session->s_con, msg);
1459 ceph_buffer_put(arg->old_xattr_buf);
1460 if (arg->wake)
1461 wake_up_all(&ci->i_cap_wq);
1462}
1463
1464static inline int __send_flush_snap(struct inode *inode,
1465 struct ceph_mds_session *session,
1466 struct ceph_cap_snap *capsnap,
1467 u32 mseq, u64 oldest_flush_tid)
1468{
1469 struct cap_msg_args arg;
1470 struct ceph_msg *msg;
1471
1472 msg = ceph_msg_new(CEPH_MSG_CLIENT_CAPS, CAP_MSG_SIZE, GFP_NOFS, false);
1473 if (!msg)
1474 return -ENOMEM;
1475
1476 arg.session = session;
1477 arg.ino = ceph_vino(inode).ino;
1478 arg.cid = 0;
1479 arg.follows = capsnap->follows;
1480 arg.flush_tid = capsnap->cap_flush.tid;
1481 arg.oldest_flush_tid = oldest_flush_tid;
1482
1483 arg.size = capsnap->size;
1484 arg.max_size = 0;
1485 arg.xattr_version = capsnap->xattr_version;
1486 arg.xattr_buf = capsnap->xattr_blob;
1487 arg.old_xattr_buf = NULL;
1488
1489 arg.atime = capsnap->atime;
1490 arg.mtime = capsnap->mtime;
1491 arg.ctime = capsnap->ctime;
1492 arg.btime = capsnap->btime;
1493 arg.change_attr = capsnap->change_attr;
1494
1495 arg.op = CEPH_CAP_OP_FLUSHSNAP;
1496 arg.caps = capsnap->issued;
1497 arg.wanted = 0;
1498 arg.dirty = capsnap->dirty;
1499
1500 arg.seq = 0;
1501 arg.issue_seq = 0;
1502 arg.mseq = mseq;
1503 arg.time_warp_seq = capsnap->time_warp_seq;
1504
1505 arg.uid = capsnap->uid;
1506 arg.gid = capsnap->gid;
1507 arg.mode = capsnap->mode;
1508
1509 arg.inline_data = capsnap->inline_data;
1510 arg.flags = 0;
1511 arg.wake = false;
1512
1513 encode_cap_msg(msg, &arg);
1514 ceph_con_send(&arg.session->s_con, msg);
1515 return 0;
1516}
1517
1518/*
1519 * When a snapshot is taken, clients accumulate dirty metadata on
1520 * inodes with capabilities in ceph_cap_snaps to describe the file
1521 * state at the time the snapshot was taken. This must be flushed
1522 * asynchronously back to the MDS once sync writes complete and dirty
1523 * data is written out.
1524 *
1525 * Called under i_ceph_lock.
1526 */
1527static void __ceph_flush_snaps(struct ceph_inode_info *ci,
1528 struct ceph_mds_session *session)
1529 __releases(ci->i_ceph_lock)
1530 __acquires(ci->i_ceph_lock)
1531{
1532 struct inode *inode = &ci->netfs.inode;
1533 struct ceph_mds_client *mdsc = session->s_mdsc;
1534 struct ceph_cap_snap *capsnap;
1535 u64 oldest_flush_tid = 0;
1536 u64 first_tid = 1, last_tid = 0;
1537
1538 dout("__flush_snaps %p session %p\n", inode, session);
1539
1540 list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) {
1541 /*
1542 * we need to wait for sync writes to complete and for dirty
1543 * pages to be written out.
1544 */
1545 if (capsnap->dirty_pages || capsnap->writing)
1546 break;
1547
1548 /* should be removed by ceph_try_drop_cap_snap() */
1549 BUG_ON(!capsnap->need_flush);
1550
1551 /* only flush each capsnap once */
1552 if (capsnap->cap_flush.tid > 0) {
1553 dout(" already flushed %p, skipping\n", capsnap);
1554 continue;
1555 }
1556
1557 spin_lock(&mdsc->cap_dirty_lock);
1558 capsnap->cap_flush.tid = ++mdsc->last_cap_flush_tid;
1559 list_add_tail(&capsnap->cap_flush.g_list,
1560 &mdsc->cap_flush_list);
1561 if (oldest_flush_tid == 0)
1562 oldest_flush_tid = __get_oldest_flush_tid(mdsc);
1563 if (list_empty(&ci->i_flushing_item)) {
1564 list_add_tail(&ci->i_flushing_item,
1565 &session->s_cap_flushing);
1566 }
1567 spin_unlock(&mdsc->cap_dirty_lock);
1568
1569 list_add_tail(&capsnap->cap_flush.i_list,
1570 &ci->i_cap_flush_list);
1571
1572 if (first_tid == 1)
1573 first_tid = capsnap->cap_flush.tid;
1574 last_tid = capsnap->cap_flush.tid;
1575 }
1576
1577 ci->i_ceph_flags &= ~CEPH_I_FLUSH_SNAPS;
1578
1579 while (first_tid <= last_tid) {
1580 struct ceph_cap *cap = ci->i_auth_cap;
1581 struct ceph_cap_flush *cf = NULL, *iter;
1582 int ret;
1583
1584 if (!(cap && cap->session == session)) {
1585 dout("__flush_snaps %p auth cap %p not mds%d, "
1586 "stop\n", inode, cap, session->s_mds);
1587 break;
1588 }
1589
1590 ret = -ENOENT;
1591 list_for_each_entry(iter, &ci->i_cap_flush_list, i_list) {
1592 if (iter->tid >= first_tid) {
1593 cf = iter;
1594 ret = 0;
1595 break;
1596 }
1597 }
1598 if (ret < 0)
1599 break;
1600
1601 first_tid = cf->tid + 1;
1602
1603 capsnap = container_of(cf, struct ceph_cap_snap, cap_flush);
1604 refcount_inc(&capsnap->nref);
1605 spin_unlock(&ci->i_ceph_lock);
1606
1607 dout("__flush_snaps %p capsnap %p tid %llu %s\n",
1608 inode, capsnap, cf->tid, ceph_cap_string(capsnap->dirty));
1609
1610 ret = __send_flush_snap(inode, session, capsnap, cap->mseq,
1611 oldest_flush_tid);
1612 if (ret < 0) {
1613 pr_err("__flush_snaps: error sending cap flushsnap, "
1614 "ino (%llx.%llx) tid %llu follows %llu\n",
1615 ceph_vinop(inode), cf->tid, capsnap->follows);
1616 }
1617
1618 ceph_put_cap_snap(capsnap);
1619 spin_lock(&ci->i_ceph_lock);
1620 }
1621}
1622
1623void ceph_flush_snaps(struct ceph_inode_info *ci,
1624 struct ceph_mds_session **psession)
1625{
1626 struct inode *inode = &ci->netfs.inode;
1627 struct ceph_mds_client *mdsc = ceph_inode_to_client(inode)->mdsc;
1628 struct ceph_mds_session *session = NULL;
1629 int mds;
1630
1631 dout("ceph_flush_snaps %p\n", inode);
1632 if (psession)
1633 session = *psession;
1634retry:
1635 spin_lock(&ci->i_ceph_lock);
1636 if (!(ci->i_ceph_flags & CEPH_I_FLUSH_SNAPS)) {
1637 dout(" no capsnap needs flush, doing nothing\n");
1638 goto out;
1639 }
1640 if (!ci->i_auth_cap) {
1641 dout(" no auth cap (migrating?), doing nothing\n");
1642 goto out;
1643 }
1644
1645 mds = ci->i_auth_cap->session->s_mds;
1646 if (session && session->s_mds != mds) {
1647 dout(" oops, wrong session %p mutex\n", session);
1648 ceph_put_mds_session(session);
1649 session = NULL;
1650 }
1651 if (!session) {
1652 spin_unlock(&ci->i_ceph_lock);
1653 mutex_lock(&mdsc->mutex);
1654 session = __ceph_lookup_mds_session(mdsc, mds);
1655 mutex_unlock(&mdsc->mutex);
1656 goto retry;
1657 }
1658
1659 // make sure flushsnap messages are sent in proper order.
1660 if (ci->i_ceph_flags & CEPH_I_KICK_FLUSH)
1661 __kick_flushing_caps(mdsc, session, ci, 0);
1662
1663 __ceph_flush_snaps(ci, session);
1664out:
1665 spin_unlock(&ci->i_ceph_lock);
1666
1667 if (psession)
1668 *psession = session;
1669 else
1670 ceph_put_mds_session(session);
1671 /* we flushed them all; remove this inode from the queue */
1672 spin_lock(&mdsc->snap_flush_lock);
1673 list_del_init(&ci->i_snap_flush_item);
1674 spin_unlock(&mdsc->snap_flush_lock);
1675}
1676
1677/*
1678 * Mark caps dirty. If inode is newly dirty, return the dirty flags.
1679 * Caller is then responsible for calling __mark_inode_dirty with the
1680 * returned flags value.
1681 */
1682int __ceph_mark_dirty_caps(struct ceph_inode_info *ci, int mask,
1683 struct ceph_cap_flush **pcf)
1684{
1685 struct ceph_mds_client *mdsc =
1686 ceph_sb_to_client(ci->netfs.inode.i_sb)->mdsc;
1687 struct inode *inode = &ci->netfs.inode;
1688 int was = ci->i_dirty_caps;
1689 int dirty = 0;
1690
1691 lockdep_assert_held(&ci->i_ceph_lock);
1692
1693 if (!ci->i_auth_cap) {
1694 pr_warn("__mark_dirty_caps %p %llx mask %s, "
1695 "but no auth cap (session was closed?)\n",
1696 inode, ceph_ino(inode), ceph_cap_string(mask));
1697 return 0;
1698 }
1699
1700 dout("__mark_dirty_caps %p %s dirty %s -> %s\n", &ci->netfs.inode,
1701 ceph_cap_string(mask), ceph_cap_string(was),
1702 ceph_cap_string(was | mask));
1703 ci->i_dirty_caps |= mask;
1704 if (was == 0) {
1705 struct ceph_mds_session *session = ci->i_auth_cap->session;
1706
1707 WARN_ON_ONCE(ci->i_prealloc_cap_flush);
1708 swap(ci->i_prealloc_cap_flush, *pcf);
1709
1710 if (!ci->i_head_snapc) {
1711 WARN_ON_ONCE(!rwsem_is_locked(&mdsc->snap_rwsem));
1712 ci->i_head_snapc = ceph_get_snap_context(
1713 ci->i_snap_realm->cached_context);
1714 }
1715 dout(" inode %p now dirty snapc %p auth cap %p\n",
1716 &ci->netfs.inode, ci->i_head_snapc, ci->i_auth_cap);
1717 BUG_ON(!list_empty(&ci->i_dirty_item));
1718 spin_lock(&mdsc->cap_dirty_lock);
1719 list_add(&ci->i_dirty_item, &session->s_cap_dirty);
1720 spin_unlock(&mdsc->cap_dirty_lock);
1721 if (ci->i_flushing_caps == 0) {
1722 ihold(inode);
1723 dirty |= I_DIRTY_SYNC;
1724 }
1725 } else {
1726 WARN_ON_ONCE(!ci->i_prealloc_cap_flush);
1727 }
1728 BUG_ON(list_empty(&ci->i_dirty_item));
1729 if (((was | ci->i_flushing_caps) & CEPH_CAP_FILE_BUFFER) &&
1730 (mask & CEPH_CAP_FILE_BUFFER))
1731 dirty |= I_DIRTY_DATASYNC;
1732 __cap_delay_requeue(mdsc, ci);
1733 return dirty;
1734}
1735
1736struct ceph_cap_flush *ceph_alloc_cap_flush(void)
1737{
1738 struct ceph_cap_flush *cf;
1739
1740 cf = kmem_cache_alloc(ceph_cap_flush_cachep, GFP_KERNEL);
1741 if (!cf)
1742 return NULL;
1743
1744 cf->is_capsnap = false;
1745 return cf;
1746}
1747
1748void ceph_free_cap_flush(struct ceph_cap_flush *cf)
1749{
1750 if (cf)
1751 kmem_cache_free(ceph_cap_flush_cachep, cf);
1752}
1753
1754static u64 __get_oldest_flush_tid(struct ceph_mds_client *mdsc)
1755{
1756 if (!list_empty(&mdsc->cap_flush_list)) {
1757 struct ceph_cap_flush *cf =
1758 list_first_entry(&mdsc->cap_flush_list,
1759 struct ceph_cap_flush, g_list);
1760 return cf->tid;
1761 }
1762 return 0;
1763}
1764
1765/*
1766 * Remove cap_flush from the mdsc's or inode's flushing cap list.
1767 * Return true if caller needs to wake up flush waiters.
1768 */
1769static bool __detach_cap_flush_from_mdsc(struct ceph_mds_client *mdsc,
1770 struct ceph_cap_flush *cf)
1771{
1772 struct ceph_cap_flush *prev;
1773 bool wake = cf->wake;
1774
1775 if (wake && cf->g_list.prev != &mdsc->cap_flush_list) {
1776 prev = list_prev_entry(cf, g_list);
1777 prev->wake = true;
1778 wake = false;
1779 }
1780 list_del_init(&cf->g_list);
1781 return wake;
1782}
1783
1784static bool __detach_cap_flush_from_ci(struct ceph_inode_info *ci,
1785 struct ceph_cap_flush *cf)
1786{
1787 struct ceph_cap_flush *prev;
1788 bool wake = cf->wake;
1789
1790 if (wake && cf->i_list.prev != &ci->i_cap_flush_list) {
1791 prev = list_prev_entry(cf, i_list);
1792 prev->wake = true;
1793 wake = false;
1794 }
1795 list_del_init(&cf->i_list);
1796 return wake;
1797}
1798
1799/*
1800 * Add dirty inode to the flushing list. Assigned a seq number so we
1801 * can wait for caps to flush without starving.
1802 *
1803 * Called under i_ceph_lock. Returns the flush tid.
1804 */
1805static u64 __mark_caps_flushing(struct inode *inode,
1806 struct ceph_mds_session *session, bool wake,
1807 u64 *oldest_flush_tid)
1808{
1809 struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
1810 struct ceph_inode_info *ci = ceph_inode(inode);
1811 struct ceph_cap_flush *cf = NULL;
1812 int flushing;
1813
1814 lockdep_assert_held(&ci->i_ceph_lock);
1815 BUG_ON(ci->i_dirty_caps == 0);
1816 BUG_ON(list_empty(&ci->i_dirty_item));
1817 BUG_ON(!ci->i_prealloc_cap_flush);
1818
1819 flushing = ci->i_dirty_caps;
1820 dout("__mark_caps_flushing flushing %s, flushing_caps %s -> %s\n",
1821 ceph_cap_string(flushing),
1822 ceph_cap_string(ci->i_flushing_caps),
1823 ceph_cap_string(ci->i_flushing_caps | flushing));
1824 ci->i_flushing_caps |= flushing;
1825 ci->i_dirty_caps = 0;
1826 dout(" inode %p now !dirty\n", inode);
1827
1828 swap(cf, ci->i_prealloc_cap_flush);
1829 cf->caps = flushing;
1830 cf->wake = wake;
1831
1832 spin_lock(&mdsc->cap_dirty_lock);
1833 list_del_init(&ci->i_dirty_item);
1834
1835 cf->tid = ++mdsc->last_cap_flush_tid;
1836 list_add_tail(&cf->g_list, &mdsc->cap_flush_list);
1837 *oldest_flush_tid = __get_oldest_flush_tid(mdsc);
1838
1839 if (list_empty(&ci->i_flushing_item)) {
1840 list_add_tail(&ci->i_flushing_item, &session->s_cap_flushing);
1841 mdsc->num_cap_flushing++;
1842 }
1843 spin_unlock(&mdsc->cap_dirty_lock);
1844
1845 list_add_tail(&cf->i_list, &ci->i_cap_flush_list);
1846
1847 return cf->tid;
1848}
1849
1850/*
1851 * try to invalidate mapping pages without blocking.
1852 */
1853static int try_nonblocking_invalidate(struct inode *inode)
1854 __releases(ci->i_ceph_lock)
1855 __acquires(ci->i_ceph_lock)
1856{
1857 struct ceph_inode_info *ci = ceph_inode(inode);
1858 u32 invalidating_gen = ci->i_rdcache_gen;
1859
1860 spin_unlock(&ci->i_ceph_lock);
1861 ceph_fscache_invalidate(inode, false);
1862 invalidate_mapping_pages(&inode->i_data, 0, -1);
1863 spin_lock(&ci->i_ceph_lock);
1864
1865 if (inode->i_data.nrpages == 0 &&
1866 invalidating_gen == ci->i_rdcache_gen) {
1867 /* success. */
1868 dout("try_nonblocking_invalidate %p success\n", inode);
1869 /* save any racing async invalidate some trouble */
1870 ci->i_rdcache_revoking = ci->i_rdcache_gen - 1;
1871 return 0;
1872 }
1873 dout("try_nonblocking_invalidate %p failed\n", inode);
1874 return -1;
1875}
1876
1877bool __ceph_should_report_size(struct ceph_inode_info *ci)
1878{
1879 loff_t size = i_size_read(&ci->netfs.inode);
1880 /* mds will adjust max size according to the reported size */
1881 if (ci->i_flushing_caps & CEPH_CAP_FILE_WR)
1882 return false;
1883 if (size >= ci->i_max_size)
1884 return true;
1885 /* half of previous max_size increment has been used */
1886 if (ci->i_max_size > ci->i_reported_size &&
1887 (size << 1) >= ci->i_max_size + ci->i_reported_size)
1888 return true;
1889 return false;
1890}
1891
1892/*
1893 * Swiss army knife function to examine currently used and wanted
1894 * versus held caps. Release, flush, ack revoked caps to mds as
1895 * appropriate.
1896 *
1897 * CHECK_CAPS_AUTHONLY - we should only check the auth cap
1898 * CHECK_CAPS_FLUSH - we should flush any dirty caps immediately, without
1899 * further delay.
1900 */
1901void ceph_check_caps(struct ceph_inode_info *ci, int flags)
1902{
1903 struct inode *inode = &ci->netfs.inode;
1904 struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(inode->i_sb);
1905 struct ceph_cap *cap;
1906 u64 flush_tid, oldest_flush_tid;
1907 int file_wanted, used, cap_used;
1908 int issued, implemented, want, retain, revoking, flushing = 0;
1909 int mds = -1; /* keep track of how far we've gone through i_caps list
1910 to avoid an infinite loop on retry */
1911 struct rb_node *p;
1912 bool queue_invalidate = false;
1913 bool tried_invalidate = false;
1914 bool queue_writeback = false;
1915 struct ceph_mds_session *session = NULL;
1916
1917 spin_lock(&ci->i_ceph_lock);
1918 if (ci->i_ceph_flags & CEPH_I_ASYNC_CREATE) {
1919 ci->i_ceph_flags |= CEPH_I_ASYNC_CHECK_CAPS;
1920
1921 /* Don't send messages until we get async create reply */
1922 spin_unlock(&ci->i_ceph_lock);
1923 return;
1924 }
1925
1926 if (ci->i_ceph_flags & CEPH_I_FLUSH)
1927 flags |= CHECK_CAPS_FLUSH;
1928retry:
1929 /* Caps wanted by virtue of active open files. */
1930 file_wanted = __ceph_caps_file_wanted(ci);
1931
1932 /* Caps which have active references against them */
1933 used = __ceph_caps_used(ci);
1934
1935 /*
1936 * "issued" represents the current caps that the MDS wants us to have.
1937 * "implemented" is the set that we have been granted, and includes the
1938 * ones that have not yet been returned to the MDS (the "revoking" set,
1939 * usually because they have outstanding references).
1940 */
1941 issued = __ceph_caps_issued(ci, &implemented);
1942 revoking = implemented & ~issued;
1943
1944 want = file_wanted;
1945
1946 /* The ones we currently want to retain (may be adjusted below) */
1947 retain = file_wanted | used | CEPH_CAP_PIN;
1948 if (!mdsc->stopping && inode->i_nlink > 0) {
1949 if (file_wanted) {
1950 retain |= CEPH_CAP_ANY; /* be greedy */
1951 } else if (S_ISDIR(inode->i_mode) &&
1952 (issued & CEPH_CAP_FILE_SHARED) &&
1953 __ceph_dir_is_complete(ci)) {
1954 /*
1955 * If a directory is complete, we want to keep
1956 * the exclusive cap. So that MDS does not end up
1957 * revoking the shared cap on every create/unlink
1958 * operation.
1959 */
1960 if (IS_RDONLY(inode)) {
1961 want = CEPH_CAP_ANY_SHARED;
1962 } else {
1963 want |= CEPH_CAP_ANY_SHARED | CEPH_CAP_FILE_EXCL;
1964 }
1965 retain |= want;
1966 } else {
1967
1968 retain |= CEPH_CAP_ANY_SHARED;
1969 /*
1970 * keep RD only if we didn't have the file open RW,
1971 * because then the mds would revoke it anyway to
1972 * journal max_size=0.
1973 */
1974 if (ci->i_max_size == 0)
1975 retain |= CEPH_CAP_ANY_RD;
1976 }
1977 }
1978
1979 dout("check_caps %llx.%llx file_want %s used %s dirty %s flushing %s"
1980 " issued %s revoking %s retain %s %s%s%s\n", ceph_vinop(inode),
1981 ceph_cap_string(file_wanted),
1982 ceph_cap_string(used), ceph_cap_string(ci->i_dirty_caps),
1983 ceph_cap_string(ci->i_flushing_caps),
1984 ceph_cap_string(issued), ceph_cap_string(revoking),
1985 ceph_cap_string(retain),
1986 (flags & CHECK_CAPS_AUTHONLY) ? " AUTHONLY" : "",
1987 (flags & CHECK_CAPS_FLUSH) ? " FLUSH" : "",
1988 (flags & CHECK_CAPS_NOINVAL) ? " NOINVAL" : "");
1989
1990 /*
1991 * If we no longer need to hold onto old our caps, and we may
1992 * have cached pages, but don't want them, then try to invalidate.
1993 * If we fail, it's because pages are locked.... try again later.
1994 */
1995 if ((!(flags & CHECK_CAPS_NOINVAL) || mdsc->stopping) &&
1996 S_ISREG(inode->i_mode) &&
1997 !(ci->i_wb_ref || ci->i_wrbuffer_ref) && /* no dirty pages... */
1998 inode->i_data.nrpages && /* have cached pages */
1999 (revoking & (CEPH_CAP_FILE_CACHE|
2000 CEPH_CAP_FILE_LAZYIO)) && /* or revoking cache */
2001 !tried_invalidate) {
2002 dout("check_caps trying to invalidate on %llx.%llx\n",
2003 ceph_vinop(inode));
2004 if (try_nonblocking_invalidate(inode) < 0) {
2005 dout("check_caps queuing invalidate\n");
2006 queue_invalidate = true;
2007 ci->i_rdcache_revoking = ci->i_rdcache_gen;
2008 }
2009 tried_invalidate = true;
2010 goto retry;
2011 }
2012
2013 for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
2014 int mflags = 0;
2015 struct cap_msg_args arg;
2016
2017 cap = rb_entry(p, struct ceph_cap, ci_node);
2018
2019 /* avoid looping forever */
2020 if (mds >= cap->mds ||
2021 ((flags & CHECK_CAPS_AUTHONLY) && cap != ci->i_auth_cap))
2022 continue;
2023
2024 /*
2025 * If we have an auth cap, we don't need to consider any
2026 * overlapping caps as used.
2027 */
2028 cap_used = used;
2029 if (ci->i_auth_cap && cap != ci->i_auth_cap)
2030 cap_used &= ~ci->i_auth_cap->issued;
2031
2032 revoking = cap->implemented & ~cap->issued;
2033 dout(" mds%d cap %p used %s issued %s implemented %s revoking %s\n",
2034 cap->mds, cap, ceph_cap_string(cap_used),
2035 ceph_cap_string(cap->issued),
2036 ceph_cap_string(cap->implemented),
2037 ceph_cap_string(revoking));
2038
2039 if (cap == ci->i_auth_cap &&
2040 (cap->issued & CEPH_CAP_FILE_WR)) {
2041 /* request larger max_size from MDS? */
2042 if (ci->i_wanted_max_size > ci->i_max_size &&
2043 ci->i_wanted_max_size > ci->i_requested_max_size) {
2044 dout("requesting new max_size\n");
2045 goto ack;
2046 }
2047
2048 /* approaching file_max? */
2049 if (__ceph_should_report_size(ci)) {
2050 dout("i_size approaching max_size\n");
2051 goto ack;
2052 }
2053 }
2054 /* flush anything dirty? */
2055 if (cap == ci->i_auth_cap) {
2056 if ((flags & CHECK_CAPS_FLUSH) && ci->i_dirty_caps) {
2057 dout("flushing dirty caps\n");
2058 goto ack;
2059 }
2060 if (ci->i_ceph_flags & CEPH_I_FLUSH_SNAPS) {
2061 dout("flushing snap caps\n");
2062 goto ack;
2063 }
2064 }
2065
2066 /* completed revocation? going down and there are no caps? */
2067 if (revoking) {
2068 if ((revoking & cap_used) == 0) {
2069 dout("completed revocation of %s\n",
2070 ceph_cap_string(cap->implemented & ~cap->issued));
2071 goto ack;
2072 }
2073
2074 /*
2075 * If the "i_wrbuffer_ref" was increased by mmap or generic
2076 * cache write just before the ceph_check_caps() is called,
2077 * the Fb capability revoking will fail this time. Then we
2078 * must wait for the BDI's delayed work to flush the dirty
2079 * pages and to release the "i_wrbuffer_ref", which will cost
2080 * at most 5 seconds. That means the MDS needs to wait at
2081 * most 5 seconds to finished the Fb capability's revocation.
2082 *
2083 * Let's queue a writeback for it.
2084 */
2085 if (S_ISREG(inode->i_mode) && ci->i_wrbuffer_ref &&
2086 (revoking & CEPH_CAP_FILE_BUFFER))
2087 queue_writeback = true;
2088 }
2089
2090 /* want more caps from mds? */
2091 if (want & ~cap->mds_wanted) {
2092 if (want & ~(cap->mds_wanted | cap->issued))
2093 goto ack;
2094 if (!__cap_is_valid(cap))
2095 goto ack;
2096 }
2097
2098 /* things we might delay */
2099 if ((cap->issued & ~retain) == 0)
2100 continue; /* nope, all good */
2101
2102ack:
2103 ceph_put_mds_session(session);
2104 session = ceph_get_mds_session(cap->session);
2105
2106 /* kick flushing and flush snaps before sending normal
2107 * cap message */
2108 if (cap == ci->i_auth_cap &&
2109 (ci->i_ceph_flags &
2110 (CEPH_I_KICK_FLUSH | CEPH_I_FLUSH_SNAPS))) {
2111 if (ci->i_ceph_flags & CEPH_I_KICK_FLUSH)
2112 __kick_flushing_caps(mdsc, session, ci, 0);
2113 if (ci->i_ceph_flags & CEPH_I_FLUSH_SNAPS)
2114 __ceph_flush_snaps(ci, session);
2115
2116 goto retry;
2117 }
2118
2119 if (cap == ci->i_auth_cap && ci->i_dirty_caps) {
2120 flushing = ci->i_dirty_caps;
2121 flush_tid = __mark_caps_flushing(inode, session, false,
2122 &oldest_flush_tid);
2123 if (flags & CHECK_CAPS_FLUSH &&
2124 list_empty(&session->s_cap_dirty))
2125 mflags |= CEPH_CLIENT_CAPS_SYNC;
2126 } else {
2127 flushing = 0;
2128 flush_tid = 0;
2129 spin_lock(&mdsc->cap_dirty_lock);
2130 oldest_flush_tid = __get_oldest_flush_tid(mdsc);
2131 spin_unlock(&mdsc->cap_dirty_lock);
2132 }
2133
2134 mds = cap->mds; /* remember mds, so we don't repeat */
2135
2136 __prep_cap(&arg, cap, CEPH_CAP_OP_UPDATE, mflags, cap_used,
2137 want, retain, flushing, flush_tid, oldest_flush_tid);
2138
2139 spin_unlock(&ci->i_ceph_lock);
2140 __send_cap(&arg, ci);
2141 spin_lock(&ci->i_ceph_lock);
2142
2143 goto retry; /* retake i_ceph_lock and restart our cap scan. */
2144 }
2145
2146 /* periodically re-calculate caps wanted by open files */
2147 if (__ceph_is_any_real_caps(ci) &&
2148 list_empty(&ci->i_cap_delay_list) &&
2149 (file_wanted & ~CEPH_CAP_PIN) &&
2150 !(used & (CEPH_CAP_FILE_RD | CEPH_CAP_ANY_FILE_WR))) {
2151 __cap_delay_requeue(mdsc, ci);
2152 }
2153
2154 spin_unlock(&ci->i_ceph_lock);
2155
2156 ceph_put_mds_session(session);
2157 if (queue_writeback)
2158 ceph_queue_writeback(inode);
2159 if (queue_invalidate)
2160 ceph_queue_invalidate(inode);
2161}
2162
2163/*
2164 * Try to flush dirty caps back to the auth mds.
2165 */
2166static int try_flush_caps(struct inode *inode, u64 *ptid)
2167{
2168 struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
2169 struct ceph_inode_info *ci = ceph_inode(inode);
2170 int flushing = 0;
2171 u64 flush_tid = 0, oldest_flush_tid = 0;
2172
2173 spin_lock(&ci->i_ceph_lock);
2174retry_locked:
2175 if (ci->i_dirty_caps && ci->i_auth_cap) {
2176 struct ceph_cap *cap = ci->i_auth_cap;
2177 struct cap_msg_args arg;
2178 struct ceph_mds_session *session = cap->session;
2179
2180 if (session->s_state < CEPH_MDS_SESSION_OPEN) {
2181 spin_unlock(&ci->i_ceph_lock);
2182 goto out;
2183 }
2184
2185 if (ci->i_ceph_flags &
2186 (CEPH_I_KICK_FLUSH | CEPH_I_FLUSH_SNAPS)) {
2187 if (ci->i_ceph_flags & CEPH_I_KICK_FLUSH)
2188 __kick_flushing_caps(mdsc, session, ci, 0);
2189 if (ci->i_ceph_flags & CEPH_I_FLUSH_SNAPS)
2190 __ceph_flush_snaps(ci, session);
2191 goto retry_locked;
2192 }
2193
2194 flushing = ci->i_dirty_caps;
2195 flush_tid = __mark_caps_flushing(inode, session, true,
2196 &oldest_flush_tid);
2197
2198 __prep_cap(&arg, cap, CEPH_CAP_OP_FLUSH, CEPH_CLIENT_CAPS_SYNC,
2199 __ceph_caps_used(ci), __ceph_caps_wanted(ci),
2200 (cap->issued | cap->implemented),
2201 flushing, flush_tid, oldest_flush_tid);
2202 spin_unlock(&ci->i_ceph_lock);
2203
2204 __send_cap(&arg, ci);
2205 } else {
2206 if (!list_empty(&ci->i_cap_flush_list)) {
2207 struct ceph_cap_flush *cf =
2208 list_last_entry(&ci->i_cap_flush_list,
2209 struct ceph_cap_flush, i_list);
2210 cf->wake = true;
2211 flush_tid = cf->tid;
2212 }
2213 flushing = ci->i_flushing_caps;
2214 spin_unlock(&ci->i_ceph_lock);
2215 }
2216out:
2217 *ptid = flush_tid;
2218 return flushing;
2219}
2220
2221/*
2222 * Return true if we've flushed caps through the given flush_tid.
2223 */
2224static int caps_are_flushed(struct inode *inode, u64 flush_tid)
2225{
2226 struct ceph_inode_info *ci = ceph_inode(inode);
2227 int ret = 1;
2228
2229 spin_lock(&ci->i_ceph_lock);
2230 if (!list_empty(&ci->i_cap_flush_list)) {
2231 struct ceph_cap_flush * cf =
2232 list_first_entry(&ci->i_cap_flush_list,
2233 struct ceph_cap_flush, i_list);
2234 if (cf->tid <= flush_tid)
2235 ret = 0;
2236 }
2237 spin_unlock(&ci->i_ceph_lock);
2238 return ret;
2239}
2240
2241/*
2242 * flush the mdlog and wait for any unsafe requests to complete.
2243 */
2244static int flush_mdlog_and_wait_inode_unsafe_requests(struct inode *inode)
2245{
2246 struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
2247 struct ceph_inode_info *ci = ceph_inode(inode);
2248 struct ceph_mds_request *req1 = NULL, *req2 = NULL;
2249 int ret, err = 0;
2250
2251 spin_lock(&ci->i_unsafe_lock);
2252 if (S_ISDIR(inode->i_mode) && !list_empty(&ci->i_unsafe_dirops)) {
2253 req1 = list_last_entry(&ci->i_unsafe_dirops,
2254 struct ceph_mds_request,
2255 r_unsafe_dir_item);
2256 ceph_mdsc_get_request(req1);
2257 }
2258 if (!list_empty(&ci->i_unsafe_iops)) {
2259 req2 = list_last_entry(&ci->i_unsafe_iops,
2260 struct ceph_mds_request,
2261 r_unsafe_target_item);
2262 ceph_mdsc_get_request(req2);
2263 }
2264 spin_unlock(&ci->i_unsafe_lock);
2265
2266 /*
2267 * Trigger to flush the journal logs in all the relevant MDSes
2268 * manually, or in the worst case we must wait at most 5 seconds
2269 * to wait the journal logs to be flushed by the MDSes periodically.
2270 */
2271 if (req1 || req2) {
2272 struct ceph_mds_request *req;
2273 struct ceph_mds_session **sessions;
2274 struct ceph_mds_session *s;
2275 unsigned int max_sessions;
2276 int i;
2277
2278 mutex_lock(&mdsc->mutex);
2279 max_sessions = mdsc->max_sessions;
2280
2281 sessions = kcalloc(max_sessions, sizeof(s), GFP_KERNEL);
2282 if (!sessions) {
2283 mutex_unlock(&mdsc->mutex);
2284 err = -ENOMEM;
2285 goto out;
2286 }
2287
2288 spin_lock(&ci->i_unsafe_lock);
2289 if (req1) {
2290 list_for_each_entry(req, &ci->i_unsafe_dirops,
2291 r_unsafe_dir_item) {
2292 s = req->r_session;
2293 if (!s)
2294 continue;
2295 if (!sessions[s->s_mds]) {
2296 s = ceph_get_mds_session(s);
2297 sessions[s->s_mds] = s;
2298 }
2299 }
2300 }
2301 if (req2) {
2302 list_for_each_entry(req, &ci->i_unsafe_iops,
2303 r_unsafe_target_item) {
2304 s = req->r_session;
2305 if (!s)
2306 continue;
2307 if (!sessions[s->s_mds]) {
2308 s = ceph_get_mds_session(s);
2309 sessions[s->s_mds] = s;
2310 }
2311 }
2312 }
2313 spin_unlock(&ci->i_unsafe_lock);
2314
2315 /* the auth MDS */
2316 spin_lock(&ci->i_ceph_lock);
2317 if (ci->i_auth_cap) {
2318 s = ci->i_auth_cap->session;
2319 if (!sessions[s->s_mds])
2320 sessions[s->s_mds] = ceph_get_mds_session(s);
2321 }
2322 spin_unlock(&ci->i_ceph_lock);
2323 mutex_unlock(&mdsc->mutex);
2324
2325 /* send flush mdlog request to MDSes */
2326 for (i = 0; i < max_sessions; i++) {
2327 s = sessions[i];
2328 if (s) {
2329 send_flush_mdlog(s);
2330 ceph_put_mds_session(s);
2331 }
2332 }
2333 kfree(sessions);
2334 }
2335
2336 dout("%s %p wait on tid %llu %llu\n", __func__,
2337 inode, req1 ? req1->r_tid : 0ULL, req2 ? req2->r_tid : 0ULL);
2338 if (req1) {
2339 ret = !wait_for_completion_timeout(&req1->r_safe_completion,
2340 ceph_timeout_jiffies(req1->r_timeout));
2341 if (ret)
2342 err = -EIO;
2343 }
2344 if (req2) {
2345 ret = !wait_for_completion_timeout(&req2->r_safe_completion,
2346 ceph_timeout_jiffies(req2->r_timeout));
2347 if (ret)
2348 err = -EIO;
2349 }
2350
2351out:
2352 if (req1)
2353 ceph_mdsc_put_request(req1);
2354 if (req2)
2355 ceph_mdsc_put_request(req2);
2356 return err;
2357}
2358
2359int ceph_fsync(struct file *file, loff_t start, loff_t end, int datasync)
2360{
2361 struct inode *inode = file->f_mapping->host;
2362 struct ceph_inode_info *ci = ceph_inode(inode);
2363 u64 flush_tid;
2364 int ret, err;
2365 int dirty;
2366
2367 dout("fsync %p%s\n", inode, datasync ? " datasync" : "");
2368
2369 ret = file_write_and_wait_range(file, start, end);
2370 if (datasync)
2371 goto out;
2372
2373 ret = ceph_wait_on_async_create(inode);
2374 if (ret)
2375 goto out;
2376
2377 dirty = try_flush_caps(inode, &flush_tid);
2378 dout("fsync dirty caps are %s\n", ceph_cap_string(dirty));
2379
2380 err = flush_mdlog_and_wait_inode_unsafe_requests(inode);
2381
2382 /*
2383 * only wait on non-file metadata writeback (the mds
2384 * can recover size and mtime, so we don't need to
2385 * wait for that)
2386 */
2387 if (!err && (dirty & ~CEPH_CAP_ANY_FILE_WR)) {
2388 err = wait_event_interruptible(ci->i_cap_wq,
2389 caps_are_flushed(inode, flush_tid));
2390 }
2391
2392 if (err < 0)
2393 ret = err;
2394
2395 err = file_check_and_advance_wb_err(file);
2396 if (err < 0)
2397 ret = err;
2398out:
2399 dout("fsync %p%s result=%d\n", inode, datasync ? " datasync" : "", ret);
2400 return ret;
2401}
2402
2403/*
2404 * Flush any dirty caps back to the mds. If we aren't asked to wait,
2405 * queue inode for flush but don't do so immediately, because we can
2406 * get by with fewer MDS messages if we wait for data writeback to
2407 * complete first.
2408 */
2409int ceph_write_inode(struct inode *inode, struct writeback_control *wbc)
2410{
2411 struct ceph_inode_info *ci = ceph_inode(inode);
2412 u64 flush_tid;
2413 int err = 0;
2414 int dirty;
2415 int wait = (wbc->sync_mode == WB_SYNC_ALL && !wbc->for_sync);
2416
2417 dout("write_inode %p wait=%d\n", inode, wait);
2418 ceph_fscache_unpin_writeback(inode, wbc);
2419 if (wait) {
2420 err = ceph_wait_on_async_create(inode);
2421 if (err)
2422 return err;
2423 dirty = try_flush_caps(inode, &flush_tid);
2424 if (dirty)
2425 err = wait_event_interruptible(ci->i_cap_wq,
2426 caps_are_flushed(inode, flush_tid));
2427 } else {
2428 struct ceph_mds_client *mdsc =
2429 ceph_sb_to_client(inode->i_sb)->mdsc;
2430
2431 spin_lock(&ci->i_ceph_lock);
2432 if (__ceph_caps_dirty(ci))
2433 __cap_delay_requeue_front(mdsc, ci);
2434 spin_unlock(&ci->i_ceph_lock);
2435 }
2436 return err;
2437}
2438
2439static void __kick_flushing_caps(struct ceph_mds_client *mdsc,
2440 struct ceph_mds_session *session,
2441 struct ceph_inode_info *ci,
2442 u64 oldest_flush_tid)
2443 __releases(ci->i_ceph_lock)
2444 __acquires(ci->i_ceph_lock)
2445{
2446 struct inode *inode = &ci->netfs.inode;
2447 struct ceph_cap *cap;
2448 struct ceph_cap_flush *cf;
2449 int ret;
2450 u64 first_tid = 0;
2451 u64 last_snap_flush = 0;
2452
2453 /* Don't do anything until create reply comes in */
2454 if (ci->i_ceph_flags & CEPH_I_ASYNC_CREATE)
2455 return;
2456
2457 ci->i_ceph_flags &= ~CEPH_I_KICK_FLUSH;
2458
2459 list_for_each_entry_reverse(cf, &ci->i_cap_flush_list, i_list) {
2460 if (cf->is_capsnap) {
2461 last_snap_flush = cf->tid;
2462 break;
2463 }
2464 }
2465
2466 list_for_each_entry(cf, &ci->i_cap_flush_list, i_list) {
2467 if (cf->tid < first_tid)
2468 continue;
2469
2470 cap = ci->i_auth_cap;
2471 if (!(cap && cap->session == session)) {
2472 pr_err("%p auth cap %p not mds%d ???\n",
2473 inode, cap, session->s_mds);
2474 break;
2475 }
2476
2477 first_tid = cf->tid + 1;
2478
2479 if (!cf->is_capsnap) {
2480 struct cap_msg_args arg;
2481
2482 dout("kick_flushing_caps %p cap %p tid %llu %s\n",
2483 inode, cap, cf->tid, ceph_cap_string(cf->caps));
2484 __prep_cap(&arg, cap, CEPH_CAP_OP_FLUSH,
2485 (cf->tid < last_snap_flush ?
2486 CEPH_CLIENT_CAPS_PENDING_CAPSNAP : 0),
2487 __ceph_caps_used(ci),
2488 __ceph_caps_wanted(ci),
2489 (cap->issued | cap->implemented),
2490 cf->caps, cf->tid, oldest_flush_tid);
2491 spin_unlock(&ci->i_ceph_lock);
2492 __send_cap(&arg, ci);
2493 } else {
2494 struct ceph_cap_snap *capsnap =
2495 container_of(cf, struct ceph_cap_snap,
2496 cap_flush);
2497 dout("kick_flushing_caps %p capsnap %p tid %llu %s\n",
2498 inode, capsnap, cf->tid,
2499 ceph_cap_string(capsnap->dirty));
2500
2501 refcount_inc(&capsnap->nref);
2502 spin_unlock(&ci->i_ceph_lock);
2503
2504 ret = __send_flush_snap(inode, session, capsnap, cap->mseq,
2505 oldest_flush_tid);
2506 if (ret < 0) {
2507 pr_err("kick_flushing_caps: error sending "
2508 "cap flushsnap, ino (%llx.%llx) "
2509 "tid %llu follows %llu\n",
2510 ceph_vinop(inode), cf->tid,
2511 capsnap->follows);
2512 }
2513
2514 ceph_put_cap_snap(capsnap);
2515 }
2516
2517 spin_lock(&ci->i_ceph_lock);
2518 }
2519}
2520
2521void ceph_early_kick_flushing_caps(struct ceph_mds_client *mdsc,
2522 struct ceph_mds_session *session)
2523{
2524 struct ceph_inode_info *ci;
2525 struct ceph_cap *cap;
2526 u64 oldest_flush_tid;
2527
2528 dout("early_kick_flushing_caps mds%d\n", session->s_mds);
2529
2530 spin_lock(&mdsc->cap_dirty_lock);
2531 oldest_flush_tid = __get_oldest_flush_tid(mdsc);
2532 spin_unlock(&mdsc->cap_dirty_lock);
2533
2534 list_for_each_entry(ci, &session->s_cap_flushing, i_flushing_item) {
2535 spin_lock(&ci->i_ceph_lock);
2536 cap = ci->i_auth_cap;
2537 if (!(cap && cap->session == session)) {
2538 pr_err("%p auth cap %p not mds%d ???\n",
2539 &ci->netfs.inode, cap, session->s_mds);
2540 spin_unlock(&ci->i_ceph_lock);
2541 continue;
2542 }
2543
2544
2545 /*
2546 * if flushing caps were revoked, we re-send the cap flush
2547 * in client reconnect stage. This guarantees MDS * processes
2548 * the cap flush message before issuing the flushing caps to
2549 * other client.
2550 */
2551 if ((cap->issued & ci->i_flushing_caps) !=
2552 ci->i_flushing_caps) {
2553 /* encode_caps_cb() also will reset these sequence
2554 * numbers. make sure sequence numbers in cap flush
2555 * message match later reconnect message */
2556 cap->seq = 0;
2557 cap->issue_seq = 0;
2558 cap->mseq = 0;
2559 __kick_flushing_caps(mdsc, session, ci,
2560 oldest_flush_tid);
2561 } else {
2562 ci->i_ceph_flags |= CEPH_I_KICK_FLUSH;
2563 }
2564
2565 spin_unlock(&ci->i_ceph_lock);
2566 }
2567}
2568
2569void ceph_kick_flushing_caps(struct ceph_mds_client *mdsc,
2570 struct ceph_mds_session *session)
2571{
2572 struct ceph_inode_info *ci;
2573 struct ceph_cap *cap;
2574 u64 oldest_flush_tid;
2575
2576 lockdep_assert_held(&session->s_mutex);
2577
2578 dout("kick_flushing_caps mds%d\n", session->s_mds);
2579
2580 spin_lock(&mdsc->cap_dirty_lock);
2581 oldest_flush_tid = __get_oldest_flush_tid(mdsc);
2582 spin_unlock(&mdsc->cap_dirty_lock);
2583
2584 list_for_each_entry(ci, &session->s_cap_flushing, i_flushing_item) {
2585 spin_lock(&ci->i_ceph_lock);
2586 cap = ci->i_auth_cap;
2587 if (!(cap && cap->session == session)) {
2588 pr_err("%p auth cap %p not mds%d ???\n",
2589 &ci->netfs.inode, cap, session->s_mds);
2590 spin_unlock(&ci->i_ceph_lock);
2591 continue;
2592 }
2593 if (ci->i_ceph_flags & CEPH_I_KICK_FLUSH) {
2594 __kick_flushing_caps(mdsc, session, ci,
2595 oldest_flush_tid);
2596 }
2597 spin_unlock(&ci->i_ceph_lock);
2598 }
2599}
2600
2601void ceph_kick_flushing_inode_caps(struct ceph_mds_session *session,
2602 struct ceph_inode_info *ci)
2603{
2604 struct ceph_mds_client *mdsc = session->s_mdsc;
2605 struct ceph_cap *cap = ci->i_auth_cap;
2606
2607 lockdep_assert_held(&ci->i_ceph_lock);
2608
2609 dout("%s %p flushing %s\n", __func__, &ci->netfs.inode,
2610 ceph_cap_string(ci->i_flushing_caps));
2611
2612 if (!list_empty(&ci->i_cap_flush_list)) {
2613 u64 oldest_flush_tid;
2614 spin_lock(&mdsc->cap_dirty_lock);
2615 list_move_tail(&ci->i_flushing_item,
2616 &cap->session->s_cap_flushing);
2617 oldest_flush_tid = __get_oldest_flush_tid(mdsc);
2618 spin_unlock(&mdsc->cap_dirty_lock);
2619
2620 __kick_flushing_caps(mdsc, session, ci, oldest_flush_tid);
2621 }
2622}
2623
2624
2625/*
2626 * Take references to capabilities we hold, so that we don't release
2627 * them to the MDS prematurely.
2628 */
2629void ceph_take_cap_refs(struct ceph_inode_info *ci, int got,
2630 bool snap_rwsem_locked)
2631{
2632 lockdep_assert_held(&ci->i_ceph_lock);
2633
2634 if (got & CEPH_CAP_PIN)
2635 ci->i_pin_ref++;
2636 if (got & CEPH_CAP_FILE_RD)
2637 ci->i_rd_ref++;
2638 if (got & CEPH_CAP_FILE_CACHE)
2639 ci->i_rdcache_ref++;
2640 if (got & CEPH_CAP_FILE_EXCL)
2641 ci->i_fx_ref++;
2642 if (got & CEPH_CAP_FILE_WR) {
2643 if (ci->i_wr_ref == 0 && !ci->i_head_snapc) {
2644 BUG_ON(!snap_rwsem_locked);
2645 ci->i_head_snapc = ceph_get_snap_context(
2646 ci->i_snap_realm->cached_context);
2647 }
2648 ci->i_wr_ref++;
2649 }
2650 if (got & CEPH_CAP_FILE_BUFFER) {
2651 if (ci->i_wb_ref == 0)
2652 ihold(&ci->netfs.inode);
2653 ci->i_wb_ref++;
2654 dout("%s %p wb %d -> %d (?)\n", __func__,
2655 &ci->netfs.inode, ci->i_wb_ref-1, ci->i_wb_ref);
2656 }
2657}
2658
2659/*
2660 * Try to grab cap references. Specify those refs we @want, and the
2661 * minimal set we @need. Also include the larger offset we are writing
2662 * to (when applicable), and check against max_size here as well.
2663 * Note that caller is responsible for ensuring max_size increases are
2664 * requested from the MDS.
2665 *
2666 * Returns 0 if caps were not able to be acquired (yet), 1 if succeed,
2667 * or a negative error code. There are 3 speical error codes:
2668 * -EAGAIN: need to sleep but non-blocking is specified
2669 * -EFBIG: ask caller to call check_max_size() and try again.
2670 * -EUCLEAN: ask caller to call ceph_renew_caps() and try again.
2671 */
2672enum {
2673 /* first 8 bits are reserved for CEPH_FILE_MODE_FOO */
2674 NON_BLOCKING = (1 << 8),
2675 CHECK_FILELOCK = (1 << 9),
2676};
2677
2678static int try_get_cap_refs(struct inode *inode, int need, int want,
2679 loff_t endoff, int flags, int *got)
2680{
2681 struct ceph_inode_info *ci = ceph_inode(inode);
2682 struct ceph_mds_client *mdsc = ceph_inode_to_client(inode)->mdsc;
2683 int ret = 0;
2684 int have, implemented;
2685 bool snap_rwsem_locked = false;
2686
2687 dout("get_cap_refs %p need %s want %s\n", inode,
2688 ceph_cap_string(need), ceph_cap_string(want));
2689
2690again:
2691 spin_lock(&ci->i_ceph_lock);
2692
2693 if ((flags & CHECK_FILELOCK) &&
2694 (ci->i_ceph_flags & CEPH_I_ERROR_FILELOCK)) {
2695 dout("try_get_cap_refs %p error filelock\n", inode);
2696 ret = -EIO;
2697 goto out_unlock;
2698 }
2699
2700 /* finish pending truncate */
2701 while (ci->i_truncate_pending) {
2702 spin_unlock(&ci->i_ceph_lock);
2703 if (snap_rwsem_locked) {
2704 up_read(&mdsc->snap_rwsem);
2705 snap_rwsem_locked = false;
2706 }
2707 __ceph_do_pending_vmtruncate(inode);
2708 spin_lock(&ci->i_ceph_lock);
2709 }
2710
2711 have = __ceph_caps_issued(ci, &implemented);
2712
2713 if (have & need & CEPH_CAP_FILE_WR) {
2714 if (endoff >= 0 && endoff > (loff_t)ci->i_max_size) {
2715 dout("get_cap_refs %p endoff %llu > maxsize %llu\n",
2716 inode, endoff, ci->i_max_size);
2717 if (endoff > ci->i_requested_max_size)
2718 ret = ci->i_auth_cap ? -EFBIG : -EUCLEAN;
2719 goto out_unlock;
2720 }
2721 /*
2722 * If a sync write is in progress, we must wait, so that we
2723 * can get a final snapshot value for size+mtime.
2724 */
2725 if (__ceph_have_pending_cap_snap(ci)) {
2726 dout("get_cap_refs %p cap_snap_pending\n", inode);
2727 goto out_unlock;
2728 }
2729 }
2730
2731 if ((have & need) == need) {
2732 /*
2733 * Look at (implemented & ~have & not) so that we keep waiting
2734 * on transition from wanted -> needed caps. This is needed
2735 * for WRBUFFER|WR -> WR to avoid a new WR sync write from
2736 * going before a prior buffered writeback happens.
2737 *
2738 * For RDCACHE|RD -> RD, there is not need to wait and we can
2739 * just exclude the revoking caps and force to sync read.
2740 */
2741 int not = want & ~(have & need);
2742 int revoking = implemented & ~have;
2743 int exclude = revoking & not;
2744 dout("get_cap_refs %p have %s but not %s (revoking %s)\n",
2745 inode, ceph_cap_string(have), ceph_cap_string(not),
2746 ceph_cap_string(revoking));
2747 if (!exclude || !(exclude & CEPH_CAP_FILE_BUFFER)) {
2748 if (!snap_rwsem_locked &&
2749 !ci->i_head_snapc &&
2750 (need & CEPH_CAP_FILE_WR)) {
2751 if (!down_read_trylock(&mdsc->snap_rwsem)) {
2752 /*
2753 * we can not call down_read() when
2754 * task isn't in TASK_RUNNING state
2755 */
2756 if (flags & NON_BLOCKING) {
2757 ret = -EAGAIN;
2758 goto out_unlock;
2759 }
2760
2761 spin_unlock(&ci->i_ceph_lock);
2762 down_read(&mdsc->snap_rwsem);
2763 snap_rwsem_locked = true;
2764 goto again;
2765 }
2766 snap_rwsem_locked = true;
2767 }
2768 if ((have & want) == want)
2769 *got = need | (want & ~exclude);
2770 else
2771 *got = need;
2772 ceph_take_cap_refs(ci, *got, true);
2773 ret = 1;
2774 }
2775 } else {
2776 int session_readonly = false;
2777 int mds_wanted;
2778 if (ci->i_auth_cap &&
2779 (need & (CEPH_CAP_FILE_WR | CEPH_CAP_FILE_EXCL))) {
2780 struct ceph_mds_session *s = ci->i_auth_cap->session;
2781 spin_lock(&s->s_cap_lock);
2782 session_readonly = s->s_readonly;
2783 spin_unlock(&s->s_cap_lock);
2784 }
2785 if (session_readonly) {
2786 dout("get_cap_refs %p need %s but mds%d readonly\n",
2787 inode, ceph_cap_string(need), ci->i_auth_cap->mds);
2788 ret = -EROFS;
2789 goto out_unlock;
2790 }
2791
2792 if (ceph_inode_is_shutdown(inode)) {
2793 dout("get_cap_refs %p inode is shutdown\n", inode);
2794 ret = -ESTALE;
2795 goto out_unlock;
2796 }
2797 mds_wanted = __ceph_caps_mds_wanted(ci, false);
2798 if (need & ~mds_wanted) {
2799 dout("get_cap_refs %p need %s > mds_wanted %s\n",
2800 inode, ceph_cap_string(need),
2801 ceph_cap_string(mds_wanted));
2802 ret = -EUCLEAN;
2803 goto out_unlock;
2804 }
2805
2806 dout("get_cap_refs %p have %s need %s\n", inode,
2807 ceph_cap_string(have), ceph_cap_string(need));
2808 }
2809out_unlock:
2810
2811 __ceph_touch_fmode(ci, mdsc, flags);
2812
2813 spin_unlock(&ci->i_ceph_lock);
2814 if (snap_rwsem_locked)
2815 up_read(&mdsc->snap_rwsem);
2816
2817 if (!ret)
2818 ceph_update_cap_mis(&mdsc->metric);
2819 else if (ret == 1)
2820 ceph_update_cap_hit(&mdsc->metric);
2821
2822 dout("get_cap_refs %p ret %d got %s\n", inode,
2823 ret, ceph_cap_string(*got));
2824 return ret;
2825}
2826
2827/*
2828 * Check the offset we are writing up to against our current
2829 * max_size. If necessary, tell the MDS we want to write to
2830 * a larger offset.
2831 */
2832static void check_max_size(struct inode *inode, loff_t endoff)
2833{
2834 struct ceph_inode_info *ci = ceph_inode(inode);
2835 int check = 0;
2836
2837 /* do we need to explicitly request a larger max_size? */
2838 spin_lock(&ci->i_ceph_lock);
2839 if (endoff >= ci->i_max_size && endoff > ci->i_wanted_max_size) {
2840 dout("write %p at large endoff %llu, req max_size\n",
2841 inode, endoff);
2842 ci->i_wanted_max_size = endoff;
2843 }
2844 /* duplicate ceph_check_caps()'s logic */
2845 if (ci->i_auth_cap &&
2846 (ci->i_auth_cap->issued & CEPH_CAP_FILE_WR) &&
2847 ci->i_wanted_max_size > ci->i_max_size &&
2848 ci->i_wanted_max_size > ci->i_requested_max_size)
2849 check = 1;
2850 spin_unlock(&ci->i_ceph_lock);
2851 if (check)
2852 ceph_check_caps(ci, CHECK_CAPS_AUTHONLY);
2853}
2854
2855static inline int get_used_fmode(int caps)
2856{
2857 int fmode = 0;
2858 if (caps & CEPH_CAP_FILE_RD)
2859 fmode |= CEPH_FILE_MODE_RD;
2860 if (caps & CEPH_CAP_FILE_WR)
2861 fmode |= CEPH_FILE_MODE_WR;
2862 return fmode;
2863}
2864
2865int ceph_try_get_caps(struct inode *inode, int need, int want,
2866 bool nonblock, int *got)
2867{
2868 int ret, flags;
2869
2870 BUG_ON(need & ~CEPH_CAP_FILE_RD);
2871 BUG_ON(want & ~(CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO |
2872 CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_EXCL |
2873 CEPH_CAP_ANY_DIR_OPS));
2874 if (need) {
2875 ret = ceph_pool_perm_check(inode, need);
2876 if (ret < 0)
2877 return ret;
2878 }
2879
2880 flags = get_used_fmode(need | want);
2881 if (nonblock)
2882 flags |= NON_BLOCKING;
2883
2884 ret = try_get_cap_refs(inode, need, want, 0, flags, got);
2885 /* three special error codes */
2886 if (ret == -EAGAIN || ret == -EFBIG || ret == -EUCLEAN)
2887 ret = 0;
2888 return ret;
2889}
2890
2891/*
2892 * Wait for caps, and take cap references. If we can't get a WR cap
2893 * due to a small max_size, make sure we check_max_size (and possibly
2894 * ask the mds) so we don't get hung up indefinitely.
2895 */
2896int ceph_get_caps(struct file *filp, int need, int want, loff_t endoff, int *got)
2897{
2898 struct ceph_file_info *fi = filp->private_data;
2899 struct inode *inode = file_inode(filp);
2900 struct ceph_inode_info *ci = ceph_inode(inode);
2901 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
2902 int ret, _got, flags;
2903
2904 ret = ceph_pool_perm_check(inode, need);
2905 if (ret < 0)
2906 return ret;
2907
2908 if ((fi->fmode & CEPH_FILE_MODE_WR) &&
2909 fi->filp_gen != READ_ONCE(fsc->filp_gen))
2910 return -EBADF;
2911
2912 flags = get_used_fmode(need | want);
2913
2914 while (true) {
2915 flags &= CEPH_FILE_MODE_MASK;
2916 if (vfs_inode_has_locks(inode))
2917 flags |= CHECK_FILELOCK;
2918 _got = 0;
2919 ret = try_get_cap_refs(inode, need, want, endoff,
2920 flags, &_got);
2921 WARN_ON_ONCE(ret == -EAGAIN);
2922 if (!ret) {
2923 struct ceph_mds_client *mdsc = fsc->mdsc;
2924 struct cap_wait cw;
2925 DEFINE_WAIT_FUNC(wait, woken_wake_function);
2926
2927 cw.ino = ceph_ino(inode);
2928 cw.tgid = current->tgid;
2929 cw.need = need;
2930 cw.want = want;
2931
2932 spin_lock(&mdsc->caps_list_lock);
2933 list_add(&cw.list, &mdsc->cap_wait_list);
2934 spin_unlock(&mdsc->caps_list_lock);
2935
2936 /* make sure used fmode not timeout */
2937 ceph_get_fmode(ci, flags, FMODE_WAIT_BIAS);
2938 add_wait_queue(&ci->i_cap_wq, &wait);
2939
2940 flags |= NON_BLOCKING;
2941 while (!(ret = try_get_cap_refs(inode, need, want,
2942 endoff, flags, &_got))) {
2943 if (signal_pending(current)) {
2944 ret = -ERESTARTSYS;
2945 break;
2946 }
2947 wait_woken(&wait, TASK_INTERRUPTIBLE, MAX_SCHEDULE_TIMEOUT);
2948 }
2949
2950 remove_wait_queue(&ci->i_cap_wq, &wait);
2951 ceph_put_fmode(ci, flags, FMODE_WAIT_BIAS);
2952
2953 spin_lock(&mdsc->caps_list_lock);
2954 list_del(&cw.list);
2955 spin_unlock(&mdsc->caps_list_lock);
2956
2957 if (ret == -EAGAIN)
2958 continue;
2959 }
2960
2961 if ((fi->fmode & CEPH_FILE_MODE_WR) &&
2962 fi->filp_gen != READ_ONCE(fsc->filp_gen)) {
2963 if (ret >= 0 && _got)
2964 ceph_put_cap_refs(ci, _got);
2965 return -EBADF;
2966 }
2967
2968 if (ret < 0) {
2969 if (ret == -EFBIG || ret == -EUCLEAN) {
2970 int ret2 = ceph_wait_on_async_create(inode);
2971 if (ret2 < 0)
2972 return ret2;
2973 }
2974 if (ret == -EFBIG) {
2975 check_max_size(inode, endoff);
2976 continue;
2977 }
2978 if (ret == -EUCLEAN) {
2979 /* session was killed, try renew caps */
2980 ret = ceph_renew_caps(inode, flags);
2981 if (ret == 0)
2982 continue;
2983 }
2984 return ret;
2985 }
2986
2987 if (S_ISREG(ci->netfs.inode.i_mode) &&
2988 ceph_has_inline_data(ci) &&
2989 (_got & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) &&
2990 i_size_read(inode) > 0) {
2991 struct page *page =
2992 find_get_page(inode->i_mapping, 0);
2993 if (page) {
2994 bool uptodate = PageUptodate(page);
2995
2996 put_page(page);
2997 if (uptodate)
2998 break;
2999 }
3000 /*
3001 * drop cap refs first because getattr while
3002 * holding * caps refs can cause deadlock.
3003 */
3004 ceph_put_cap_refs(ci, _got);
3005 _got = 0;
3006
3007 /*
3008 * getattr request will bring inline data into
3009 * page cache
3010 */
3011 ret = __ceph_do_getattr(inode, NULL,
3012 CEPH_STAT_CAP_INLINE_DATA,
3013 true);
3014 if (ret < 0)
3015 return ret;
3016 continue;
3017 }
3018 break;
3019 }
3020 *got = _got;
3021 return 0;
3022}
3023
3024/*
3025 * Take cap refs. Caller must already know we hold at least one ref
3026 * on the caps in question or we don't know this is safe.
3027 */
3028void ceph_get_cap_refs(struct ceph_inode_info *ci, int caps)
3029{
3030 spin_lock(&ci->i_ceph_lock);
3031 ceph_take_cap_refs(ci, caps, false);
3032 spin_unlock(&ci->i_ceph_lock);
3033}
3034
3035
3036/*
3037 * drop cap_snap that is not associated with any snapshot.
3038 * we don't need to send FLUSHSNAP message for it.
3039 */
3040static int ceph_try_drop_cap_snap(struct ceph_inode_info *ci,
3041 struct ceph_cap_snap *capsnap)
3042{
3043 if (!capsnap->need_flush &&
3044 !capsnap->writing && !capsnap->dirty_pages) {
3045 dout("dropping cap_snap %p follows %llu\n",
3046 capsnap, capsnap->follows);
3047 BUG_ON(capsnap->cap_flush.tid > 0);
3048 ceph_put_snap_context(capsnap->context);
3049 if (!list_is_last(&capsnap->ci_item, &ci->i_cap_snaps))
3050 ci->i_ceph_flags |= CEPH_I_FLUSH_SNAPS;
3051
3052 list_del(&capsnap->ci_item);
3053 ceph_put_cap_snap(capsnap);
3054 return 1;
3055 }
3056 return 0;
3057}
3058
3059enum put_cap_refs_mode {
3060 PUT_CAP_REFS_SYNC = 0,
3061 PUT_CAP_REFS_NO_CHECK,
3062 PUT_CAP_REFS_ASYNC,
3063};
3064
3065/*
3066 * Release cap refs.
3067 *
3068 * If we released the last ref on any given cap, call ceph_check_caps
3069 * to release (or schedule a release).
3070 *
3071 * If we are releasing a WR cap (from a sync write), finalize any affected
3072 * cap_snap, and wake up any waiters.
3073 */
3074static void __ceph_put_cap_refs(struct ceph_inode_info *ci, int had,
3075 enum put_cap_refs_mode mode)
3076{
3077 struct inode *inode = &ci->netfs.inode;
3078 int last = 0, put = 0, flushsnaps = 0, wake = 0;
3079 bool check_flushsnaps = false;
3080
3081 spin_lock(&ci->i_ceph_lock);
3082 if (had & CEPH_CAP_PIN)
3083 --ci->i_pin_ref;
3084 if (had & CEPH_CAP_FILE_RD)
3085 if (--ci->i_rd_ref == 0)
3086 last++;
3087 if (had & CEPH_CAP_FILE_CACHE)
3088 if (--ci->i_rdcache_ref == 0)
3089 last++;
3090 if (had & CEPH_CAP_FILE_EXCL)
3091 if (--ci->i_fx_ref == 0)
3092 last++;
3093 if (had & CEPH_CAP_FILE_BUFFER) {
3094 if (--ci->i_wb_ref == 0) {
3095 last++;
3096 /* put the ref held by ceph_take_cap_refs() */
3097 put++;
3098 check_flushsnaps = true;
3099 }
3100 dout("put_cap_refs %p wb %d -> %d (?)\n",
3101 inode, ci->i_wb_ref+1, ci->i_wb_ref);
3102 }
3103 if (had & CEPH_CAP_FILE_WR) {
3104 if (--ci->i_wr_ref == 0) {
3105 last++;
3106 check_flushsnaps = true;
3107 if (ci->i_wrbuffer_ref_head == 0 &&
3108 ci->i_dirty_caps == 0 &&
3109 ci->i_flushing_caps == 0) {
3110 BUG_ON(!ci->i_head_snapc);
3111 ceph_put_snap_context(ci->i_head_snapc);
3112 ci->i_head_snapc = NULL;
3113 }
3114 /* see comment in __ceph_remove_cap() */
3115 if (!__ceph_is_any_real_caps(ci) && ci->i_snap_realm)
3116 ceph_change_snap_realm(inode, NULL);
3117 }
3118 }
3119 if (check_flushsnaps && __ceph_have_pending_cap_snap(ci)) {
3120 struct ceph_cap_snap *capsnap =
3121 list_last_entry(&ci->i_cap_snaps,
3122 struct ceph_cap_snap,
3123 ci_item);
3124
3125 capsnap->writing = 0;
3126 if (ceph_try_drop_cap_snap(ci, capsnap))
3127 /* put the ref held by ceph_queue_cap_snap() */
3128 put++;
3129 else if (__ceph_finish_cap_snap(ci, capsnap))
3130 flushsnaps = 1;
3131 wake = 1;
3132 }
3133 spin_unlock(&ci->i_ceph_lock);
3134
3135 dout("put_cap_refs %p had %s%s%s\n", inode, ceph_cap_string(had),
3136 last ? " last" : "", put ? " put" : "");
3137
3138 switch (mode) {
3139 case PUT_CAP_REFS_SYNC:
3140 if (last)
3141 ceph_check_caps(ci, 0);
3142 else if (flushsnaps)
3143 ceph_flush_snaps(ci, NULL);
3144 break;
3145 case PUT_CAP_REFS_ASYNC:
3146 if (last)
3147 ceph_queue_check_caps(inode);
3148 else if (flushsnaps)
3149 ceph_queue_flush_snaps(inode);
3150 break;
3151 default:
3152 break;
3153 }
3154 if (wake)
3155 wake_up_all(&ci->i_cap_wq);
3156 while (put-- > 0)
3157 iput(inode);
3158}
3159
3160void ceph_put_cap_refs(struct ceph_inode_info *ci, int had)
3161{
3162 __ceph_put_cap_refs(ci, had, PUT_CAP_REFS_SYNC);
3163}
3164
3165void ceph_put_cap_refs_async(struct ceph_inode_info *ci, int had)
3166{
3167 __ceph_put_cap_refs(ci, had, PUT_CAP_REFS_ASYNC);
3168}
3169
3170void ceph_put_cap_refs_no_check_caps(struct ceph_inode_info *ci, int had)
3171{
3172 __ceph_put_cap_refs(ci, had, PUT_CAP_REFS_NO_CHECK);
3173}
3174
3175/*
3176 * Release @nr WRBUFFER refs on dirty pages for the given @snapc snap
3177 * context. Adjust per-snap dirty page accounting as appropriate.
3178 * Once all dirty data for a cap_snap is flushed, flush snapped file
3179 * metadata back to the MDS. If we dropped the last ref, call
3180 * ceph_check_caps.
3181 */
3182void ceph_put_wrbuffer_cap_refs(struct ceph_inode_info *ci, int nr,
3183 struct ceph_snap_context *snapc)
3184{
3185 struct inode *inode = &ci->netfs.inode;
3186 struct ceph_cap_snap *capsnap = NULL, *iter;
3187 int put = 0;
3188 bool last = false;
3189 bool flush_snaps = false;
3190 bool complete_capsnap = false;
3191
3192 spin_lock(&ci->i_ceph_lock);
3193 ci->i_wrbuffer_ref -= nr;
3194 if (ci->i_wrbuffer_ref == 0) {
3195 last = true;
3196 put++;
3197 }
3198
3199 if (ci->i_head_snapc == snapc) {
3200 ci->i_wrbuffer_ref_head -= nr;
3201 if (ci->i_wrbuffer_ref_head == 0 &&
3202 ci->i_wr_ref == 0 &&
3203 ci->i_dirty_caps == 0 &&
3204 ci->i_flushing_caps == 0) {
3205 BUG_ON(!ci->i_head_snapc);
3206 ceph_put_snap_context(ci->i_head_snapc);
3207 ci->i_head_snapc = NULL;
3208 }
3209 dout("put_wrbuffer_cap_refs on %p head %d/%d -> %d/%d %s\n",
3210 inode,
3211 ci->i_wrbuffer_ref+nr, ci->i_wrbuffer_ref_head+nr,
3212 ci->i_wrbuffer_ref, ci->i_wrbuffer_ref_head,
3213 last ? " LAST" : "");
3214 } else {
3215 list_for_each_entry(iter, &ci->i_cap_snaps, ci_item) {
3216 if (iter->context == snapc) {
3217 capsnap = iter;
3218 break;
3219 }
3220 }
3221
3222 if (!capsnap) {
3223 /*
3224 * The capsnap should already be removed when removing
3225 * auth cap in the case of a forced unmount.
3226 */
3227 WARN_ON_ONCE(ci->i_auth_cap);
3228 goto unlock;
3229 }
3230
3231 capsnap->dirty_pages -= nr;
3232 if (capsnap->dirty_pages == 0) {
3233 complete_capsnap = true;
3234 if (!capsnap->writing) {
3235 if (ceph_try_drop_cap_snap(ci, capsnap)) {
3236 put++;
3237 } else {
3238 ci->i_ceph_flags |= CEPH_I_FLUSH_SNAPS;
3239 flush_snaps = true;
3240 }
3241 }
3242 }
3243 dout("put_wrbuffer_cap_refs on %p cap_snap %p "
3244 " snap %lld %d/%d -> %d/%d %s%s\n",
3245 inode, capsnap, capsnap->context->seq,
3246 ci->i_wrbuffer_ref+nr, capsnap->dirty_pages + nr,
3247 ci->i_wrbuffer_ref, capsnap->dirty_pages,
3248 last ? " (wrbuffer last)" : "",
3249 complete_capsnap ? " (complete capsnap)" : "");
3250 }
3251
3252unlock:
3253 spin_unlock(&ci->i_ceph_lock);
3254
3255 if (last) {
3256 ceph_check_caps(ci, 0);
3257 } else if (flush_snaps) {
3258 ceph_flush_snaps(ci, NULL);
3259 }
3260 if (complete_capsnap)
3261 wake_up_all(&ci->i_cap_wq);
3262 while (put-- > 0) {
3263 iput(inode);
3264 }
3265}
3266
3267/*
3268 * Invalidate unlinked inode's aliases, so we can drop the inode ASAP.
3269 */
3270static void invalidate_aliases(struct inode *inode)
3271{
3272 struct dentry *dn, *prev = NULL;
3273
3274 dout("invalidate_aliases inode %p\n", inode);
3275 d_prune_aliases(inode);
3276 /*
3277 * For non-directory inode, d_find_alias() only returns
3278 * hashed dentry. After calling d_invalidate(), the
3279 * dentry becomes unhashed.
3280 *
3281 * For directory inode, d_find_alias() can return
3282 * unhashed dentry. But directory inode should have
3283 * one alias at most.
3284 */
3285 while ((dn = d_find_alias(inode))) {
3286 if (dn == prev) {
3287 dput(dn);
3288 break;
3289 }
3290 d_invalidate(dn);
3291 if (prev)
3292 dput(prev);
3293 prev = dn;
3294 }
3295 if (prev)
3296 dput(prev);
3297}
3298
3299struct cap_extra_info {
3300 struct ceph_string *pool_ns;
3301 /* inline data */
3302 u64 inline_version;
3303 void *inline_data;
3304 u32 inline_len;
3305 /* dirstat */
3306 bool dirstat_valid;
3307 u64 nfiles;
3308 u64 nsubdirs;
3309 u64 change_attr;
3310 /* currently issued */
3311 int issued;
3312 struct timespec64 btime;
3313};
3314
3315/*
3316 * Handle a cap GRANT message from the MDS. (Note that a GRANT may
3317 * actually be a revocation if it specifies a smaller cap set.)
3318 *
3319 * caller holds s_mutex and i_ceph_lock, we drop both.
3320 */
3321static void handle_cap_grant(struct inode *inode,
3322 struct ceph_mds_session *session,
3323 struct ceph_cap *cap,
3324 struct ceph_mds_caps *grant,
3325 struct ceph_buffer *xattr_buf,
3326 struct cap_extra_info *extra_info)
3327 __releases(ci->i_ceph_lock)
3328 __releases(session->s_mdsc->snap_rwsem)
3329{
3330 struct ceph_inode_info *ci = ceph_inode(inode);
3331 int seq = le32_to_cpu(grant->seq);
3332 int newcaps = le32_to_cpu(grant->caps);
3333 int used, wanted, dirty;
3334 u64 size = le64_to_cpu(grant->size);
3335 u64 max_size = le64_to_cpu(grant->max_size);
3336 unsigned char check_caps = 0;
3337 bool was_stale = cap->cap_gen < atomic_read(&session->s_cap_gen);
3338 bool wake = false;
3339 bool writeback = false;
3340 bool queue_trunc = false;
3341 bool queue_invalidate = false;
3342 bool deleted_inode = false;
3343 bool fill_inline = false;
3344
3345 dout("handle_cap_grant inode %p cap %p mds%d seq %d %s\n",
3346 inode, cap, session->s_mds, seq, ceph_cap_string(newcaps));
3347 dout(" size %llu max_size %llu, i_size %llu\n", size, max_size,
3348 i_size_read(inode));
3349
3350
3351 /*
3352 * If CACHE is being revoked, and we have no dirty buffers,
3353 * try to invalidate (once). (If there are dirty buffers, we
3354 * will invalidate _after_ writeback.)
3355 */
3356 if (S_ISREG(inode->i_mode) && /* don't invalidate readdir cache */
3357 ((cap->issued & ~newcaps) & CEPH_CAP_FILE_CACHE) &&
3358 (newcaps & CEPH_CAP_FILE_LAZYIO) == 0 &&
3359 !(ci->i_wrbuffer_ref || ci->i_wb_ref)) {
3360 if (try_nonblocking_invalidate(inode)) {
3361 /* there were locked pages.. invalidate later
3362 in a separate thread. */
3363 if (ci->i_rdcache_revoking != ci->i_rdcache_gen) {
3364 queue_invalidate = true;
3365 ci->i_rdcache_revoking = ci->i_rdcache_gen;
3366 }
3367 }
3368 }
3369
3370 if (was_stale)
3371 cap->issued = cap->implemented = CEPH_CAP_PIN;
3372
3373 /*
3374 * auth mds of the inode changed. we received the cap export message,
3375 * but still haven't received the cap import message. handle_cap_export
3376 * updated the new auth MDS' cap.
3377 *
3378 * "ceph_seq_cmp(seq, cap->seq) <= 0" means we are processing a message
3379 * that was sent before the cap import message. So don't remove caps.
3380 */
3381 if (ceph_seq_cmp(seq, cap->seq) <= 0) {
3382 WARN_ON(cap != ci->i_auth_cap);
3383 WARN_ON(cap->cap_id != le64_to_cpu(grant->cap_id));
3384 seq = cap->seq;
3385 newcaps |= cap->issued;
3386 }
3387
3388 /* side effects now are allowed */
3389 cap->cap_gen = atomic_read(&session->s_cap_gen);
3390 cap->seq = seq;
3391
3392 __check_cap_issue(ci, cap, newcaps);
3393
3394 inode_set_max_iversion_raw(inode, extra_info->change_attr);
3395
3396 if ((newcaps & CEPH_CAP_AUTH_SHARED) &&
3397 (extra_info->issued & CEPH_CAP_AUTH_EXCL) == 0) {
3398 umode_t mode = le32_to_cpu(grant->mode);
3399
3400 if (inode_wrong_type(inode, mode))
3401 pr_warn_once("inode type changed! (ino %llx.%llx is 0%o, mds says 0%o)\n",
3402 ceph_vinop(inode), inode->i_mode, mode);
3403 else
3404 inode->i_mode = mode;
3405 inode->i_uid = make_kuid(&init_user_ns, le32_to_cpu(grant->uid));
3406 inode->i_gid = make_kgid(&init_user_ns, le32_to_cpu(grant->gid));
3407 ci->i_btime = extra_info->btime;
3408 dout("%p mode 0%o uid.gid %d.%d\n", inode, inode->i_mode,
3409 from_kuid(&init_user_ns, inode->i_uid),
3410 from_kgid(&init_user_ns, inode->i_gid));
3411 }
3412
3413 if ((newcaps & CEPH_CAP_LINK_SHARED) &&
3414 (extra_info->issued & CEPH_CAP_LINK_EXCL) == 0) {
3415 set_nlink(inode, le32_to_cpu(grant->nlink));
3416 if (inode->i_nlink == 0)
3417 deleted_inode = true;
3418 }
3419
3420 if ((extra_info->issued & CEPH_CAP_XATTR_EXCL) == 0 &&
3421 grant->xattr_len) {
3422 int len = le32_to_cpu(grant->xattr_len);
3423 u64 version = le64_to_cpu(grant->xattr_version);
3424
3425 if (version > ci->i_xattrs.version) {
3426 dout(" got new xattrs v%llu on %p len %d\n",
3427 version, inode, len);
3428 if (ci->i_xattrs.blob)
3429 ceph_buffer_put(ci->i_xattrs.blob);
3430 ci->i_xattrs.blob = ceph_buffer_get(xattr_buf);
3431 ci->i_xattrs.version = version;
3432 ceph_forget_all_cached_acls(inode);
3433 ceph_security_invalidate_secctx(inode);
3434 }
3435 }
3436
3437 if (newcaps & CEPH_CAP_ANY_RD) {
3438 struct timespec64 mtime, atime, ctime;
3439 /* ctime/mtime/atime? */
3440 ceph_decode_timespec64(&mtime, &grant->mtime);
3441 ceph_decode_timespec64(&atime, &grant->atime);
3442 ceph_decode_timespec64(&ctime, &grant->ctime);
3443 ceph_fill_file_time(inode, extra_info->issued,
3444 le32_to_cpu(grant->time_warp_seq),
3445 &ctime, &mtime, &atime);
3446 }
3447
3448 if ((newcaps & CEPH_CAP_FILE_SHARED) && extra_info->dirstat_valid) {
3449 ci->i_files = extra_info->nfiles;
3450 ci->i_subdirs = extra_info->nsubdirs;
3451 }
3452
3453 if (newcaps & (CEPH_CAP_ANY_FILE_RD | CEPH_CAP_ANY_FILE_WR)) {
3454 /* file layout may have changed */
3455 s64 old_pool = ci->i_layout.pool_id;
3456 struct ceph_string *old_ns;
3457
3458 ceph_file_layout_from_legacy(&ci->i_layout, &grant->layout);
3459 old_ns = rcu_dereference_protected(ci->i_layout.pool_ns,
3460 lockdep_is_held(&ci->i_ceph_lock));
3461 rcu_assign_pointer(ci->i_layout.pool_ns, extra_info->pool_ns);
3462
3463 if (ci->i_layout.pool_id != old_pool ||
3464 extra_info->pool_ns != old_ns)
3465 ci->i_ceph_flags &= ~CEPH_I_POOL_PERM;
3466
3467 extra_info->pool_ns = old_ns;
3468
3469 /* size/truncate_seq? */
3470 queue_trunc = ceph_fill_file_size(inode, extra_info->issued,
3471 le32_to_cpu(grant->truncate_seq),
3472 le64_to_cpu(grant->truncate_size),
3473 size);
3474 }
3475
3476 if (ci->i_auth_cap == cap && (newcaps & CEPH_CAP_ANY_FILE_WR)) {
3477 if (max_size != ci->i_max_size) {
3478 dout("max_size %lld -> %llu\n",
3479 ci->i_max_size, max_size);
3480 ci->i_max_size = max_size;
3481 if (max_size >= ci->i_wanted_max_size) {
3482 ci->i_wanted_max_size = 0; /* reset */
3483 ci->i_requested_max_size = 0;
3484 }
3485 wake = true;
3486 }
3487 }
3488
3489 /* check cap bits */
3490 wanted = __ceph_caps_wanted(ci);
3491 used = __ceph_caps_used(ci);
3492 dirty = __ceph_caps_dirty(ci);
3493 dout(" my wanted = %s, used = %s, dirty %s\n",
3494 ceph_cap_string(wanted),
3495 ceph_cap_string(used),
3496 ceph_cap_string(dirty));
3497
3498 if ((was_stale || le32_to_cpu(grant->op) == CEPH_CAP_OP_IMPORT) &&
3499 (wanted & ~(cap->mds_wanted | newcaps))) {
3500 /*
3501 * If mds is importing cap, prior cap messages that update
3502 * 'wanted' may get dropped by mds (migrate seq mismatch).
3503 *
3504 * We don't send cap message to update 'wanted' if what we
3505 * want are already issued. If mds revokes caps, cap message
3506 * that releases caps also tells mds what we want. But if
3507 * caps got revoked by mds forcedly (session stale). We may
3508 * haven't told mds what we want.
3509 */
3510 check_caps = 1;
3511 }
3512
3513 /* revocation, grant, or no-op? */
3514 if (cap->issued & ~newcaps) {
3515 int revoking = cap->issued & ~newcaps;
3516
3517 dout("revocation: %s -> %s (revoking %s)\n",
3518 ceph_cap_string(cap->issued),
3519 ceph_cap_string(newcaps),
3520 ceph_cap_string(revoking));
3521 if (S_ISREG(inode->i_mode) &&
3522 (revoking & used & CEPH_CAP_FILE_BUFFER))
3523 writeback = true; /* initiate writeback; will delay ack */
3524 else if (queue_invalidate &&
3525 revoking == CEPH_CAP_FILE_CACHE &&
3526 (newcaps & CEPH_CAP_FILE_LAZYIO) == 0)
3527 ; /* do nothing yet, invalidation will be queued */
3528 else if (cap == ci->i_auth_cap)
3529 check_caps = 1; /* check auth cap only */
3530 else
3531 check_caps = 2; /* check all caps */
3532 /* If there is new caps, try to wake up the waiters */
3533 if (~cap->issued & newcaps)
3534 wake = true;
3535 cap->issued = newcaps;
3536 cap->implemented |= newcaps;
3537 } else if (cap->issued == newcaps) {
3538 dout("caps unchanged: %s -> %s\n",
3539 ceph_cap_string(cap->issued), ceph_cap_string(newcaps));
3540 } else {
3541 dout("grant: %s -> %s\n", ceph_cap_string(cap->issued),
3542 ceph_cap_string(newcaps));
3543 /* non-auth MDS is revoking the newly grant caps ? */
3544 if (cap == ci->i_auth_cap &&
3545 __ceph_caps_revoking_other(ci, cap, newcaps))
3546 check_caps = 2;
3547
3548 cap->issued = newcaps;
3549 cap->implemented |= newcaps; /* add bits only, to
3550 * avoid stepping on a
3551 * pending revocation */
3552 wake = true;
3553 }
3554 BUG_ON(cap->issued & ~cap->implemented);
3555
3556 if (extra_info->inline_version > 0 &&
3557 extra_info->inline_version >= ci->i_inline_version) {
3558 ci->i_inline_version = extra_info->inline_version;
3559 if (ci->i_inline_version != CEPH_INLINE_NONE &&
3560 (newcaps & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)))
3561 fill_inline = true;
3562 }
3563
3564 if (le32_to_cpu(grant->op) == CEPH_CAP_OP_IMPORT) {
3565 if (ci->i_auth_cap == cap) {
3566 if (newcaps & ~extra_info->issued)
3567 wake = true;
3568
3569 if (ci->i_requested_max_size > max_size ||
3570 !(le32_to_cpu(grant->wanted) & CEPH_CAP_ANY_FILE_WR)) {
3571 /* re-request max_size if necessary */
3572 ci->i_requested_max_size = 0;
3573 wake = true;
3574 }
3575
3576 ceph_kick_flushing_inode_caps(session, ci);
3577 }
3578 up_read(&session->s_mdsc->snap_rwsem);
3579 }
3580 spin_unlock(&ci->i_ceph_lock);
3581
3582 if (fill_inline)
3583 ceph_fill_inline_data(inode, NULL, extra_info->inline_data,
3584 extra_info->inline_len);
3585
3586 if (queue_trunc)
3587 ceph_queue_vmtruncate(inode);
3588
3589 if (writeback)
3590 /*
3591 * queue inode for writeback: we can't actually call
3592 * filemap_write_and_wait, etc. from message handler
3593 * context.
3594 */
3595 ceph_queue_writeback(inode);
3596 if (queue_invalidate)
3597 ceph_queue_invalidate(inode);
3598 if (deleted_inode)
3599 invalidate_aliases(inode);
3600 if (wake)
3601 wake_up_all(&ci->i_cap_wq);
3602
3603 mutex_unlock(&session->s_mutex);
3604 if (check_caps == 1)
3605 ceph_check_caps(ci, CHECK_CAPS_AUTHONLY | CHECK_CAPS_NOINVAL);
3606 else if (check_caps == 2)
3607 ceph_check_caps(ci, CHECK_CAPS_NOINVAL);
3608}
3609
3610/*
3611 * Handle FLUSH_ACK from MDS, indicating that metadata we sent to the
3612 * MDS has been safely committed.
3613 */
3614static void handle_cap_flush_ack(struct inode *inode, u64 flush_tid,
3615 struct ceph_mds_caps *m,
3616 struct ceph_mds_session *session,
3617 struct ceph_cap *cap)
3618 __releases(ci->i_ceph_lock)
3619{
3620 struct ceph_inode_info *ci = ceph_inode(inode);
3621 struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
3622 struct ceph_cap_flush *cf, *tmp_cf;
3623 LIST_HEAD(to_remove);
3624 unsigned seq = le32_to_cpu(m->seq);
3625 int dirty = le32_to_cpu(m->dirty);
3626 int cleaned = 0;
3627 bool drop = false;
3628 bool wake_ci = false;
3629 bool wake_mdsc = false;
3630
3631 list_for_each_entry_safe(cf, tmp_cf, &ci->i_cap_flush_list, i_list) {
3632 /* Is this the one that was flushed? */
3633 if (cf->tid == flush_tid)
3634 cleaned = cf->caps;
3635
3636 /* Is this a capsnap? */
3637 if (cf->is_capsnap)
3638 continue;
3639
3640 if (cf->tid <= flush_tid) {
3641 /*
3642 * An earlier or current tid. The FLUSH_ACK should
3643 * represent a superset of this flush's caps.
3644 */
3645 wake_ci |= __detach_cap_flush_from_ci(ci, cf);
3646 list_add_tail(&cf->i_list, &to_remove);
3647 } else {
3648 /*
3649 * This is a later one. Any caps in it are still dirty
3650 * so don't count them as cleaned.
3651 */
3652 cleaned &= ~cf->caps;
3653 if (!cleaned)
3654 break;
3655 }
3656 }
3657
3658 dout("handle_cap_flush_ack inode %p mds%d seq %d on %s cleaned %s,"
3659 " flushing %s -> %s\n",
3660 inode, session->s_mds, seq, ceph_cap_string(dirty),
3661 ceph_cap_string(cleaned), ceph_cap_string(ci->i_flushing_caps),
3662 ceph_cap_string(ci->i_flushing_caps & ~cleaned));
3663
3664 if (list_empty(&to_remove) && !cleaned)
3665 goto out;
3666
3667 ci->i_flushing_caps &= ~cleaned;
3668
3669 spin_lock(&mdsc->cap_dirty_lock);
3670
3671 list_for_each_entry(cf, &to_remove, i_list)
3672 wake_mdsc |= __detach_cap_flush_from_mdsc(mdsc, cf);
3673
3674 if (ci->i_flushing_caps == 0) {
3675 if (list_empty(&ci->i_cap_flush_list)) {
3676 list_del_init(&ci->i_flushing_item);
3677 if (!list_empty(&session->s_cap_flushing)) {
3678 dout(" mds%d still flushing cap on %p\n",
3679 session->s_mds,
3680 &list_first_entry(&session->s_cap_flushing,
3681 struct ceph_inode_info,
3682 i_flushing_item)->netfs.inode);
3683 }
3684 }
3685 mdsc->num_cap_flushing--;
3686 dout(" inode %p now !flushing\n", inode);
3687
3688 if (ci->i_dirty_caps == 0) {
3689 dout(" inode %p now clean\n", inode);
3690 BUG_ON(!list_empty(&ci->i_dirty_item));
3691 drop = true;
3692 if (ci->i_wr_ref == 0 &&
3693 ci->i_wrbuffer_ref_head == 0) {
3694 BUG_ON(!ci->i_head_snapc);
3695 ceph_put_snap_context(ci->i_head_snapc);
3696 ci->i_head_snapc = NULL;
3697 }
3698 } else {
3699 BUG_ON(list_empty(&ci->i_dirty_item));
3700 }
3701 }
3702 spin_unlock(&mdsc->cap_dirty_lock);
3703
3704out:
3705 spin_unlock(&ci->i_ceph_lock);
3706
3707 while (!list_empty(&to_remove)) {
3708 cf = list_first_entry(&to_remove,
3709 struct ceph_cap_flush, i_list);
3710 list_del_init(&cf->i_list);
3711 if (!cf->is_capsnap)
3712 ceph_free_cap_flush(cf);
3713 }
3714
3715 if (wake_ci)
3716 wake_up_all(&ci->i_cap_wq);
3717 if (wake_mdsc)
3718 wake_up_all(&mdsc->cap_flushing_wq);
3719 if (drop)
3720 iput(inode);
3721}
3722
3723void __ceph_remove_capsnap(struct inode *inode, struct ceph_cap_snap *capsnap,
3724 bool *wake_ci, bool *wake_mdsc)
3725{
3726 struct ceph_inode_info *ci = ceph_inode(inode);
3727 struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
3728 bool ret;
3729
3730 lockdep_assert_held(&ci->i_ceph_lock);
3731
3732 dout("removing capsnap %p, inode %p ci %p\n", capsnap, inode, ci);
3733
3734 list_del_init(&capsnap->ci_item);
3735 ret = __detach_cap_flush_from_ci(ci, &capsnap->cap_flush);
3736 if (wake_ci)
3737 *wake_ci = ret;
3738
3739 spin_lock(&mdsc->cap_dirty_lock);
3740 if (list_empty(&ci->i_cap_flush_list))
3741 list_del_init(&ci->i_flushing_item);
3742
3743 ret = __detach_cap_flush_from_mdsc(mdsc, &capsnap->cap_flush);
3744 if (wake_mdsc)
3745 *wake_mdsc = ret;
3746 spin_unlock(&mdsc->cap_dirty_lock);
3747}
3748
3749void ceph_remove_capsnap(struct inode *inode, struct ceph_cap_snap *capsnap,
3750 bool *wake_ci, bool *wake_mdsc)
3751{
3752 struct ceph_inode_info *ci = ceph_inode(inode);
3753
3754 lockdep_assert_held(&ci->i_ceph_lock);
3755
3756 WARN_ON_ONCE(capsnap->dirty_pages || capsnap->writing);
3757 __ceph_remove_capsnap(inode, capsnap, wake_ci, wake_mdsc);
3758}
3759
3760/*
3761 * Handle FLUSHSNAP_ACK. MDS has flushed snap data to disk and we can
3762 * throw away our cap_snap.
3763 *
3764 * Caller hold s_mutex.
3765 */
3766static void handle_cap_flushsnap_ack(struct inode *inode, u64 flush_tid,
3767 struct ceph_mds_caps *m,
3768 struct ceph_mds_session *session)
3769{
3770 struct ceph_inode_info *ci = ceph_inode(inode);
3771 struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
3772 u64 follows = le64_to_cpu(m->snap_follows);
3773 struct ceph_cap_snap *capsnap = NULL, *iter;
3774 bool wake_ci = false;
3775 bool wake_mdsc = false;
3776
3777 dout("handle_cap_flushsnap_ack inode %p ci %p mds%d follows %lld\n",
3778 inode, ci, session->s_mds, follows);
3779
3780 spin_lock(&ci->i_ceph_lock);
3781 list_for_each_entry(iter, &ci->i_cap_snaps, ci_item) {
3782 if (iter->follows == follows) {
3783 if (iter->cap_flush.tid != flush_tid) {
3784 dout(" cap_snap %p follows %lld tid %lld !="
3785 " %lld\n", iter, follows,
3786 flush_tid, iter->cap_flush.tid);
3787 break;
3788 }
3789 capsnap = iter;
3790 break;
3791 } else {
3792 dout(" skipping cap_snap %p follows %lld\n",
3793 iter, iter->follows);
3794 }
3795 }
3796 if (capsnap)
3797 ceph_remove_capsnap(inode, capsnap, &wake_ci, &wake_mdsc);
3798 spin_unlock(&ci->i_ceph_lock);
3799
3800 if (capsnap) {
3801 ceph_put_snap_context(capsnap->context);
3802 ceph_put_cap_snap(capsnap);
3803 if (wake_ci)
3804 wake_up_all(&ci->i_cap_wq);
3805 if (wake_mdsc)
3806 wake_up_all(&mdsc->cap_flushing_wq);
3807 iput(inode);
3808 }
3809}
3810
3811/*
3812 * Handle TRUNC from MDS, indicating file truncation.
3813 *
3814 * caller hold s_mutex.
3815 */
3816static bool handle_cap_trunc(struct inode *inode,
3817 struct ceph_mds_caps *trunc,
3818 struct ceph_mds_session *session)
3819{
3820 struct ceph_inode_info *ci = ceph_inode(inode);
3821 int mds = session->s_mds;
3822 int seq = le32_to_cpu(trunc->seq);
3823 u32 truncate_seq = le32_to_cpu(trunc->truncate_seq);
3824 u64 truncate_size = le64_to_cpu(trunc->truncate_size);
3825 u64 size = le64_to_cpu(trunc->size);
3826 int implemented = 0;
3827 int dirty = __ceph_caps_dirty(ci);
3828 int issued = __ceph_caps_issued(ceph_inode(inode), &implemented);
3829 bool queue_trunc = false;
3830
3831 lockdep_assert_held(&ci->i_ceph_lock);
3832
3833 issued |= implemented | dirty;
3834
3835 dout("handle_cap_trunc inode %p mds%d seq %d to %lld seq %d\n",
3836 inode, mds, seq, truncate_size, truncate_seq);
3837 queue_trunc = ceph_fill_file_size(inode, issued,
3838 truncate_seq, truncate_size, size);
3839 return queue_trunc;
3840}
3841
3842/*
3843 * Handle EXPORT from MDS. Cap is being migrated _from_ this mds to a
3844 * different one. If we are the most recent migration we've seen (as
3845 * indicated by mseq), make note of the migrating cap bits for the
3846 * duration (until we see the corresponding IMPORT).
3847 *
3848 * caller holds s_mutex
3849 */
3850static void handle_cap_export(struct inode *inode, struct ceph_mds_caps *ex,
3851 struct ceph_mds_cap_peer *ph,
3852 struct ceph_mds_session *session)
3853{
3854 struct ceph_mds_client *mdsc = ceph_inode_to_client(inode)->mdsc;
3855 struct ceph_mds_session *tsession = NULL;
3856 struct ceph_cap *cap, *tcap, *new_cap = NULL;
3857 struct ceph_inode_info *ci = ceph_inode(inode);
3858 u64 t_cap_id;
3859 unsigned mseq = le32_to_cpu(ex->migrate_seq);
3860 unsigned t_seq, t_mseq;
3861 int target, issued;
3862 int mds = session->s_mds;
3863
3864 if (ph) {
3865 t_cap_id = le64_to_cpu(ph->cap_id);
3866 t_seq = le32_to_cpu(ph->seq);
3867 t_mseq = le32_to_cpu(ph->mseq);
3868 target = le32_to_cpu(ph->mds);
3869 } else {
3870 t_cap_id = t_seq = t_mseq = 0;
3871 target = -1;
3872 }
3873
3874 dout("handle_cap_export inode %p ci %p mds%d mseq %d target %d\n",
3875 inode, ci, mds, mseq, target);
3876retry:
3877 down_read(&mdsc->snap_rwsem);
3878 spin_lock(&ci->i_ceph_lock);
3879 cap = __get_cap_for_mds(ci, mds);
3880 if (!cap || cap->cap_id != le64_to_cpu(ex->cap_id))
3881 goto out_unlock;
3882
3883 if (target < 0) {
3884 ceph_remove_cap(cap, false);
3885 goto out_unlock;
3886 }
3887
3888 /*
3889 * now we know we haven't received the cap import message yet
3890 * because the exported cap still exist.
3891 */
3892
3893 issued = cap->issued;
3894 if (issued != cap->implemented)
3895 pr_err_ratelimited("handle_cap_export: issued != implemented: "
3896 "ino (%llx.%llx) mds%d seq %d mseq %d "
3897 "issued %s implemented %s\n",
3898 ceph_vinop(inode), mds, cap->seq, cap->mseq,
3899 ceph_cap_string(issued),
3900 ceph_cap_string(cap->implemented));
3901
3902
3903 tcap = __get_cap_for_mds(ci, target);
3904 if (tcap) {
3905 /* already have caps from the target */
3906 if (tcap->cap_id == t_cap_id &&
3907 ceph_seq_cmp(tcap->seq, t_seq) < 0) {
3908 dout(" updating import cap %p mds%d\n", tcap, target);
3909 tcap->cap_id = t_cap_id;
3910 tcap->seq = t_seq - 1;
3911 tcap->issue_seq = t_seq - 1;
3912 tcap->issued |= issued;
3913 tcap->implemented |= issued;
3914 if (cap == ci->i_auth_cap) {
3915 ci->i_auth_cap = tcap;
3916 change_auth_cap_ses(ci, tcap->session);
3917 }
3918 }
3919 ceph_remove_cap(cap, false);
3920 goto out_unlock;
3921 } else if (tsession) {
3922 /* add placeholder for the export tagert */
3923 int flag = (cap == ci->i_auth_cap) ? CEPH_CAP_FLAG_AUTH : 0;
3924 tcap = new_cap;
3925 ceph_add_cap(inode, tsession, t_cap_id, issued, 0,
3926 t_seq - 1, t_mseq, (u64)-1, flag, &new_cap);
3927
3928 if (!list_empty(&ci->i_cap_flush_list) &&
3929 ci->i_auth_cap == tcap) {
3930 spin_lock(&mdsc->cap_dirty_lock);
3931 list_move_tail(&ci->i_flushing_item,
3932 &tcap->session->s_cap_flushing);
3933 spin_unlock(&mdsc->cap_dirty_lock);
3934 }
3935
3936 ceph_remove_cap(cap, false);
3937 goto out_unlock;
3938 }
3939
3940 spin_unlock(&ci->i_ceph_lock);
3941 up_read(&mdsc->snap_rwsem);
3942 mutex_unlock(&session->s_mutex);
3943
3944 /* open target session */
3945 tsession = ceph_mdsc_open_export_target_session(mdsc, target);
3946 if (!IS_ERR(tsession)) {
3947 if (mds > target) {
3948 mutex_lock(&session->s_mutex);
3949 mutex_lock_nested(&tsession->s_mutex,
3950 SINGLE_DEPTH_NESTING);
3951 } else {
3952 mutex_lock(&tsession->s_mutex);
3953 mutex_lock_nested(&session->s_mutex,
3954 SINGLE_DEPTH_NESTING);
3955 }
3956 new_cap = ceph_get_cap(mdsc, NULL);
3957 } else {
3958 WARN_ON(1);
3959 tsession = NULL;
3960 target = -1;
3961 mutex_lock(&session->s_mutex);
3962 }
3963 goto retry;
3964
3965out_unlock:
3966 spin_unlock(&ci->i_ceph_lock);
3967 up_read(&mdsc->snap_rwsem);
3968 mutex_unlock(&session->s_mutex);
3969 if (tsession) {
3970 mutex_unlock(&tsession->s_mutex);
3971 ceph_put_mds_session(tsession);
3972 }
3973 if (new_cap)
3974 ceph_put_cap(mdsc, new_cap);
3975}
3976
3977/*
3978 * Handle cap IMPORT.
3979 *
3980 * caller holds s_mutex. acquires i_ceph_lock
3981 */
3982static void handle_cap_import(struct ceph_mds_client *mdsc,
3983 struct inode *inode, struct ceph_mds_caps *im,
3984 struct ceph_mds_cap_peer *ph,
3985 struct ceph_mds_session *session,
3986 struct ceph_cap **target_cap, int *old_issued)
3987{
3988 struct ceph_inode_info *ci = ceph_inode(inode);
3989 struct ceph_cap *cap, *ocap, *new_cap = NULL;
3990 int mds = session->s_mds;
3991 int issued;
3992 unsigned caps = le32_to_cpu(im->caps);
3993 unsigned wanted = le32_to_cpu(im->wanted);
3994 unsigned seq = le32_to_cpu(im->seq);
3995 unsigned mseq = le32_to_cpu(im->migrate_seq);
3996 u64 realmino = le64_to_cpu(im->realm);
3997 u64 cap_id = le64_to_cpu(im->cap_id);
3998 u64 p_cap_id;
3999 int peer;
4000
4001 if (ph) {
4002 p_cap_id = le64_to_cpu(ph->cap_id);
4003 peer = le32_to_cpu(ph->mds);
4004 } else {
4005 p_cap_id = 0;
4006 peer = -1;
4007 }
4008
4009 dout("handle_cap_import inode %p ci %p mds%d mseq %d peer %d\n",
4010 inode, ci, mds, mseq, peer);
4011retry:
4012 cap = __get_cap_for_mds(ci, mds);
4013 if (!cap) {
4014 if (!new_cap) {
4015 spin_unlock(&ci->i_ceph_lock);
4016 new_cap = ceph_get_cap(mdsc, NULL);
4017 spin_lock(&ci->i_ceph_lock);
4018 goto retry;
4019 }
4020 cap = new_cap;
4021 } else {
4022 if (new_cap) {
4023 ceph_put_cap(mdsc, new_cap);
4024 new_cap = NULL;
4025 }
4026 }
4027
4028 __ceph_caps_issued(ci, &issued);
4029 issued |= __ceph_caps_dirty(ci);
4030
4031 ceph_add_cap(inode, session, cap_id, caps, wanted, seq, mseq,
4032 realmino, CEPH_CAP_FLAG_AUTH, &new_cap);
4033
4034 ocap = peer >= 0 ? __get_cap_for_mds(ci, peer) : NULL;
4035 if (ocap && ocap->cap_id == p_cap_id) {
4036 dout(" remove export cap %p mds%d flags %d\n",
4037 ocap, peer, ph->flags);
4038 if ((ph->flags & CEPH_CAP_FLAG_AUTH) &&
4039 (ocap->seq != le32_to_cpu(ph->seq) ||
4040 ocap->mseq != le32_to_cpu(ph->mseq))) {
4041 pr_err_ratelimited("handle_cap_import: "
4042 "mismatched seq/mseq: ino (%llx.%llx) "
4043 "mds%d seq %d mseq %d importer mds%d "
4044 "has peer seq %d mseq %d\n",
4045 ceph_vinop(inode), peer, ocap->seq,
4046 ocap->mseq, mds, le32_to_cpu(ph->seq),
4047 le32_to_cpu(ph->mseq));
4048 }
4049 ceph_remove_cap(ocap, (ph->flags & CEPH_CAP_FLAG_RELEASE));
4050 }
4051
4052 *old_issued = issued;
4053 *target_cap = cap;
4054}
4055
4056/*
4057 * Handle a caps message from the MDS.
4058 *
4059 * Identify the appropriate session, inode, and call the right handler
4060 * based on the cap op.
4061 */
4062void ceph_handle_caps(struct ceph_mds_session *session,
4063 struct ceph_msg *msg)
4064{
4065 struct ceph_mds_client *mdsc = session->s_mdsc;
4066 struct inode *inode;
4067 struct ceph_inode_info *ci;
4068 struct ceph_cap *cap;
4069 struct ceph_mds_caps *h;
4070 struct ceph_mds_cap_peer *peer = NULL;
4071 struct ceph_snap_realm *realm = NULL;
4072 int op;
4073 int msg_version = le16_to_cpu(msg->hdr.version);
4074 u32 seq, mseq;
4075 struct ceph_vino vino;
4076 void *snaptrace;
4077 size_t snaptrace_len;
4078 void *p, *end;
4079 struct cap_extra_info extra_info = {};
4080 bool queue_trunc;
4081 bool close_sessions = false;
4082
4083 dout("handle_caps from mds%d\n", session->s_mds);
4084
4085 /* decode */
4086 end = msg->front.iov_base + msg->front.iov_len;
4087 if (msg->front.iov_len < sizeof(*h))
4088 goto bad;
4089 h = msg->front.iov_base;
4090 op = le32_to_cpu(h->op);
4091 vino.ino = le64_to_cpu(h->ino);
4092 vino.snap = CEPH_NOSNAP;
4093 seq = le32_to_cpu(h->seq);
4094 mseq = le32_to_cpu(h->migrate_seq);
4095
4096 snaptrace = h + 1;
4097 snaptrace_len = le32_to_cpu(h->snap_trace_len);
4098 p = snaptrace + snaptrace_len;
4099
4100 if (msg_version >= 2) {
4101 u32 flock_len;
4102 ceph_decode_32_safe(&p, end, flock_len, bad);
4103 if (p + flock_len > end)
4104 goto bad;
4105 p += flock_len;
4106 }
4107
4108 if (msg_version >= 3) {
4109 if (op == CEPH_CAP_OP_IMPORT) {
4110 if (p + sizeof(*peer) > end)
4111 goto bad;
4112 peer = p;
4113 p += sizeof(*peer);
4114 } else if (op == CEPH_CAP_OP_EXPORT) {
4115 /* recorded in unused fields */
4116 peer = (void *)&h->size;
4117 }
4118 }
4119
4120 if (msg_version >= 4) {
4121 ceph_decode_64_safe(&p, end, extra_info.inline_version, bad);
4122 ceph_decode_32_safe(&p, end, extra_info.inline_len, bad);
4123 if (p + extra_info.inline_len > end)
4124 goto bad;
4125 extra_info.inline_data = p;
4126 p += extra_info.inline_len;
4127 }
4128
4129 if (msg_version >= 5) {
4130 struct ceph_osd_client *osdc = &mdsc->fsc->client->osdc;
4131 u32 epoch_barrier;
4132
4133 ceph_decode_32_safe(&p, end, epoch_barrier, bad);
4134 ceph_osdc_update_epoch_barrier(osdc, epoch_barrier);
4135 }
4136
4137 if (msg_version >= 8) {
4138 u32 pool_ns_len;
4139
4140 /* version >= 6 */
4141 ceph_decode_skip_64(&p, end, bad); // flush_tid
4142 /* version >= 7 */
4143 ceph_decode_skip_32(&p, end, bad); // caller_uid
4144 ceph_decode_skip_32(&p, end, bad); // caller_gid
4145 /* version >= 8 */
4146 ceph_decode_32_safe(&p, end, pool_ns_len, bad);
4147 if (pool_ns_len > 0) {
4148 ceph_decode_need(&p, end, pool_ns_len, bad);
4149 extra_info.pool_ns =
4150 ceph_find_or_create_string(p, pool_ns_len);
4151 p += pool_ns_len;
4152 }
4153 }
4154
4155 if (msg_version >= 9) {
4156 struct ceph_timespec *btime;
4157
4158 if (p + sizeof(*btime) > end)
4159 goto bad;
4160 btime = p;
4161 ceph_decode_timespec64(&extra_info.btime, btime);
4162 p += sizeof(*btime);
4163 ceph_decode_64_safe(&p, end, extra_info.change_attr, bad);
4164 }
4165
4166 if (msg_version >= 11) {
4167 /* version >= 10 */
4168 ceph_decode_skip_32(&p, end, bad); // flags
4169 /* version >= 11 */
4170 extra_info.dirstat_valid = true;
4171 ceph_decode_64_safe(&p, end, extra_info.nfiles, bad);
4172 ceph_decode_64_safe(&p, end, extra_info.nsubdirs, bad);
4173 }
4174
4175 /* lookup ino */
4176 inode = ceph_find_inode(mdsc->fsc->sb, vino);
4177 dout(" op %s ino %llx.%llx inode %p\n", ceph_cap_op_name(op), vino.ino,
4178 vino.snap, inode);
4179
4180 mutex_lock(&session->s_mutex);
4181 inc_session_sequence(session);
4182 dout(" mds%d seq %lld cap seq %u\n", session->s_mds, session->s_seq,
4183 (unsigned)seq);
4184
4185 if (!inode) {
4186 dout(" i don't have ino %llx\n", vino.ino);
4187
4188 if (op == CEPH_CAP_OP_IMPORT) {
4189 cap = ceph_get_cap(mdsc, NULL);
4190 cap->cap_ino = vino.ino;
4191 cap->queue_release = 1;
4192 cap->cap_id = le64_to_cpu(h->cap_id);
4193 cap->mseq = mseq;
4194 cap->seq = seq;
4195 cap->issue_seq = seq;
4196 spin_lock(&session->s_cap_lock);
4197 __ceph_queue_cap_release(session, cap);
4198 spin_unlock(&session->s_cap_lock);
4199 }
4200 goto flush_cap_releases;
4201 }
4202 ci = ceph_inode(inode);
4203
4204 /* these will work even if we don't have a cap yet */
4205 switch (op) {
4206 case CEPH_CAP_OP_FLUSHSNAP_ACK:
4207 handle_cap_flushsnap_ack(inode, le64_to_cpu(msg->hdr.tid),
4208 h, session);
4209 goto done;
4210
4211 case CEPH_CAP_OP_EXPORT:
4212 handle_cap_export(inode, h, peer, session);
4213 goto done_unlocked;
4214
4215 case CEPH_CAP_OP_IMPORT:
4216 realm = NULL;
4217 if (snaptrace_len) {
4218 down_write(&mdsc->snap_rwsem);
4219 if (ceph_update_snap_trace(mdsc, snaptrace,
4220 snaptrace + snaptrace_len,
4221 false, &realm)) {
4222 up_write(&mdsc->snap_rwsem);
4223 close_sessions = true;
4224 goto done;
4225 }
4226 downgrade_write(&mdsc->snap_rwsem);
4227 } else {
4228 down_read(&mdsc->snap_rwsem);
4229 }
4230 spin_lock(&ci->i_ceph_lock);
4231 handle_cap_import(mdsc, inode, h, peer, session,
4232 &cap, &extra_info.issued);
4233 handle_cap_grant(inode, session, cap,
4234 h, msg->middle, &extra_info);
4235 if (realm)
4236 ceph_put_snap_realm(mdsc, realm);
4237 goto done_unlocked;
4238 }
4239
4240 /* the rest require a cap */
4241 spin_lock(&ci->i_ceph_lock);
4242 cap = __get_cap_for_mds(ceph_inode(inode), session->s_mds);
4243 if (!cap) {
4244 dout(" no cap on %p ino %llx.%llx from mds%d\n",
4245 inode, ceph_ino(inode), ceph_snap(inode),
4246 session->s_mds);
4247 spin_unlock(&ci->i_ceph_lock);
4248 goto flush_cap_releases;
4249 }
4250
4251 /* note that each of these drops i_ceph_lock for us */
4252 switch (op) {
4253 case CEPH_CAP_OP_REVOKE:
4254 case CEPH_CAP_OP_GRANT:
4255 __ceph_caps_issued(ci, &extra_info.issued);
4256 extra_info.issued |= __ceph_caps_dirty(ci);
4257 handle_cap_grant(inode, session, cap,
4258 h, msg->middle, &extra_info);
4259 goto done_unlocked;
4260
4261 case CEPH_CAP_OP_FLUSH_ACK:
4262 handle_cap_flush_ack(inode, le64_to_cpu(msg->hdr.tid),
4263 h, session, cap);
4264 break;
4265
4266 case CEPH_CAP_OP_TRUNC:
4267 queue_trunc = handle_cap_trunc(inode, h, session);
4268 spin_unlock(&ci->i_ceph_lock);
4269 if (queue_trunc)
4270 ceph_queue_vmtruncate(inode);
4271 break;
4272
4273 default:
4274 spin_unlock(&ci->i_ceph_lock);
4275 pr_err("ceph_handle_caps: unknown cap op %d %s\n", op,
4276 ceph_cap_op_name(op));
4277 }
4278
4279done:
4280 mutex_unlock(&session->s_mutex);
4281done_unlocked:
4282 iput(inode);
4283out:
4284 ceph_put_string(extra_info.pool_ns);
4285
4286 /* Defer closing the sessions after s_mutex lock being released */
4287 if (close_sessions)
4288 ceph_mdsc_close_sessions(mdsc);
4289
4290 return;
4291
4292flush_cap_releases:
4293 /*
4294 * send any cap release message to try to move things
4295 * along for the mds (who clearly thinks we still have this
4296 * cap).
4297 */
4298 ceph_flush_cap_releases(mdsc, session);
4299 goto done;
4300
4301bad:
4302 pr_err("ceph_handle_caps: corrupt message\n");
4303 ceph_msg_dump(msg);
4304 goto out;
4305}
4306
4307/*
4308 * Delayed work handler to process end of delayed cap release LRU list.
4309 *
4310 * If new caps are added to the list while processing it, these won't get
4311 * processed in this run. In this case, the ci->i_hold_caps_max will be
4312 * returned so that the work can be scheduled accordingly.
4313 */
4314unsigned long ceph_check_delayed_caps(struct ceph_mds_client *mdsc)
4315{
4316 struct inode *inode;
4317 struct ceph_inode_info *ci;
4318 struct ceph_mount_options *opt = mdsc->fsc->mount_options;
4319 unsigned long delay_max = opt->caps_wanted_delay_max * HZ;
4320 unsigned long loop_start = jiffies;
4321 unsigned long delay = 0;
4322
4323 dout("check_delayed_caps\n");
4324 spin_lock(&mdsc->cap_delay_lock);
4325 while (!list_empty(&mdsc->cap_delay_list)) {
4326 ci = list_first_entry(&mdsc->cap_delay_list,
4327 struct ceph_inode_info,
4328 i_cap_delay_list);
4329 if (time_before(loop_start, ci->i_hold_caps_max - delay_max)) {
4330 dout("%s caps added recently. Exiting loop", __func__);
4331 delay = ci->i_hold_caps_max;
4332 break;
4333 }
4334 if ((ci->i_ceph_flags & CEPH_I_FLUSH) == 0 &&
4335 time_before(jiffies, ci->i_hold_caps_max))
4336 break;
4337 list_del_init(&ci->i_cap_delay_list);
4338
4339 inode = igrab(&ci->netfs.inode);
4340 if (inode) {
4341 spin_unlock(&mdsc->cap_delay_lock);
4342 dout("check_delayed_caps on %p\n", inode);
4343 ceph_check_caps(ci, 0);
4344 iput(inode);
4345 spin_lock(&mdsc->cap_delay_lock);
4346 }
4347 }
4348 spin_unlock(&mdsc->cap_delay_lock);
4349
4350 return delay;
4351}
4352
4353/*
4354 * Flush all dirty caps to the mds
4355 */
4356static void flush_dirty_session_caps(struct ceph_mds_session *s)
4357{
4358 struct ceph_mds_client *mdsc = s->s_mdsc;
4359 struct ceph_inode_info *ci;
4360 struct inode *inode;
4361
4362 dout("flush_dirty_caps\n");
4363 spin_lock(&mdsc->cap_dirty_lock);
4364 while (!list_empty(&s->s_cap_dirty)) {
4365 ci = list_first_entry(&s->s_cap_dirty, struct ceph_inode_info,
4366 i_dirty_item);
4367 inode = &ci->netfs.inode;
4368 ihold(inode);
4369 dout("flush_dirty_caps %llx.%llx\n", ceph_vinop(inode));
4370 spin_unlock(&mdsc->cap_dirty_lock);
4371 ceph_wait_on_async_create(inode);
4372 ceph_check_caps(ci, CHECK_CAPS_FLUSH);
4373 iput(inode);
4374 spin_lock(&mdsc->cap_dirty_lock);
4375 }
4376 spin_unlock(&mdsc->cap_dirty_lock);
4377 dout("flush_dirty_caps done\n");
4378}
4379
4380void ceph_flush_dirty_caps(struct ceph_mds_client *mdsc)
4381{
4382 ceph_mdsc_iterate_sessions(mdsc, flush_dirty_session_caps, true);
4383}
4384
4385void __ceph_touch_fmode(struct ceph_inode_info *ci,
4386 struct ceph_mds_client *mdsc, int fmode)
4387{
4388 unsigned long now = jiffies;
4389 if (fmode & CEPH_FILE_MODE_RD)
4390 ci->i_last_rd = now;
4391 if (fmode & CEPH_FILE_MODE_WR)
4392 ci->i_last_wr = now;
4393 /* queue periodic check */
4394 if (fmode &&
4395 __ceph_is_any_real_caps(ci) &&
4396 list_empty(&ci->i_cap_delay_list))
4397 __cap_delay_requeue(mdsc, ci);
4398}
4399
4400void ceph_get_fmode(struct ceph_inode_info *ci, int fmode, int count)
4401{
4402 struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(ci->netfs.inode.i_sb);
4403 int bits = (fmode << 1) | 1;
4404 bool already_opened = false;
4405 int i;
4406
4407 if (count == 1)
4408 atomic64_inc(&mdsc->metric.opened_files);
4409
4410 spin_lock(&ci->i_ceph_lock);
4411 for (i = 0; i < CEPH_FILE_MODE_BITS; i++) {
4412 /*
4413 * If any of the mode ref is larger than 0,
4414 * that means it has been already opened by
4415 * others. Just skip checking the PIN ref.
4416 */
4417 if (i && ci->i_nr_by_mode[i])
4418 already_opened = true;
4419
4420 if (bits & (1 << i))
4421 ci->i_nr_by_mode[i] += count;
4422 }
4423
4424 if (!already_opened)
4425 percpu_counter_inc(&mdsc->metric.opened_inodes);
4426 spin_unlock(&ci->i_ceph_lock);
4427}
4428
4429/*
4430 * Drop open file reference. If we were the last open file,
4431 * we may need to release capabilities to the MDS (or schedule
4432 * their delayed release).
4433 */
4434void ceph_put_fmode(struct ceph_inode_info *ci, int fmode, int count)
4435{
4436 struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(ci->netfs.inode.i_sb);
4437 int bits = (fmode << 1) | 1;
4438 bool is_closed = true;
4439 int i;
4440
4441 if (count == 1)
4442 atomic64_dec(&mdsc->metric.opened_files);
4443
4444 spin_lock(&ci->i_ceph_lock);
4445 for (i = 0; i < CEPH_FILE_MODE_BITS; i++) {
4446 if (bits & (1 << i)) {
4447 BUG_ON(ci->i_nr_by_mode[i] < count);
4448 ci->i_nr_by_mode[i] -= count;
4449 }
4450
4451 /*
4452 * If any of the mode ref is not 0 after
4453 * decreased, that means it is still opened
4454 * by others. Just skip checking the PIN ref.
4455 */
4456 if (i && ci->i_nr_by_mode[i])
4457 is_closed = false;
4458 }
4459
4460 if (is_closed)
4461 percpu_counter_dec(&mdsc->metric.opened_inodes);
4462 spin_unlock(&ci->i_ceph_lock);
4463}
4464
4465/*
4466 * For a soon-to-be unlinked file, drop the LINK caps. If it
4467 * looks like the link count will hit 0, drop any other caps (other
4468 * than PIN) we don't specifically want (due to the file still being
4469 * open).
4470 */
4471int ceph_drop_caps_for_unlink(struct inode *inode)
4472{
4473 struct ceph_inode_info *ci = ceph_inode(inode);
4474 int drop = CEPH_CAP_LINK_SHARED | CEPH_CAP_LINK_EXCL;
4475
4476 spin_lock(&ci->i_ceph_lock);
4477 if (inode->i_nlink == 1) {
4478 drop |= ~(__ceph_caps_wanted(ci) | CEPH_CAP_PIN);
4479
4480 if (__ceph_caps_dirty(ci)) {
4481 struct ceph_mds_client *mdsc =
4482 ceph_inode_to_client(inode)->mdsc;
4483 __cap_delay_requeue_front(mdsc, ci);
4484 }
4485 }
4486 spin_unlock(&ci->i_ceph_lock);
4487 return drop;
4488}
4489
4490/*
4491 * Helpers for embedding cap and dentry lease releases into mds
4492 * requests.
4493 *
4494 * @force is used by dentry_release (below) to force inclusion of a
4495 * record for the directory inode, even when there aren't any caps to
4496 * drop.
4497 */
4498int ceph_encode_inode_release(void **p, struct inode *inode,
4499 int mds, int drop, int unless, int force)
4500{
4501 struct ceph_inode_info *ci = ceph_inode(inode);
4502 struct ceph_cap *cap;
4503 struct ceph_mds_request_release *rel = *p;
4504 int used, dirty;
4505 int ret = 0;
4506
4507 spin_lock(&ci->i_ceph_lock);
4508 used = __ceph_caps_used(ci);
4509 dirty = __ceph_caps_dirty(ci);
4510
4511 dout("encode_inode_release %p mds%d used|dirty %s drop %s unless %s\n",
4512 inode, mds, ceph_cap_string(used|dirty), ceph_cap_string(drop),
4513 ceph_cap_string(unless));
4514
4515 /* only drop unused, clean caps */
4516 drop &= ~(used | dirty);
4517
4518 cap = __get_cap_for_mds(ci, mds);
4519 if (cap && __cap_is_valid(cap)) {
4520 unless &= cap->issued;
4521 if (unless) {
4522 if (unless & CEPH_CAP_AUTH_EXCL)
4523 drop &= ~CEPH_CAP_AUTH_SHARED;
4524 if (unless & CEPH_CAP_LINK_EXCL)
4525 drop &= ~CEPH_CAP_LINK_SHARED;
4526 if (unless & CEPH_CAP_XATTR_EXCL)
4527 drop &= ~CEPH_CAP_XATTR_SHARED;
4528 if (unless & CEPH_CAP_FILE_EXCL)
4529 drop &= ~CEPH_CAP_FILE_SHARED;
4530 }
4531
4532 if (force || (cap->issued & drop)) {
4533 if (cap->issued & drop) {
4534 int wanted = __ceph_caps_wanted(ci);
4535 dout("encode_inode_release %p cap %p "
4536 "%s -> %s, wanted %s -> %s\n", inode, cap,
4537 ceph_cap_string(cap->issued),
4538 ceph_cap_string(cap->issued & ~drop),
4539 ceph_cap_string(cap->mds_wanted),
4540 ceph_cap_string(wanted));
4541
4542 cap->issued &= ~drop;
4543 cap->implemented &= ~drop;
4544 cap->mds_wanted = wanted;
4545 if (cap == ci->i_auth_cap &&
4546 !(wanted & CEPH_CAP_ANY_FILE_WR))
4547 ci->i_requested_max_size = 0;
4548 } else {
4549 dout("encode_inode_release %p cap %p %s"
4550 " (force)\n", inode, cap,
4551 ceph_cap_string(cap->issued));
4552 }
4553
4554 rel->ino = cpu_to_le64(ceph_ino(inode));
4555 rel->cap_id = cpu_to_le64(cap->cap_id);
4556 rel->seq = cpu_to_le32(cap->seq);
4557 rel->issue_seq = cpu_to_le32(cap->issue_seq);
4558 rel->mseq = cpu_to_le32(cap->mseq);
4559 rel->caps = cpu_to_le32(cap->implemented);
4560 rel->wanted = cpu_to_le32(cap->mds_wanted);
4561 rel->dname_len = 0;
4562 rel->dname_seq = 0;
4563 *p += sizeof(*rel);
4564 ret = 1;
4565 } else {
4566 dout("encode_inode_release %p cap %p %s (noop)\n",
4567 inode, cap, ceph_cap_string(cap->issued));
4568 }
4569 }
4570 spin_unlock(&ci->i_ceph_lock);
4571 return ret;
4572}
4573
4574int ceph_encode_dentry_release(void **p, struct dentry *dentry,
4575 struct inode *dir,
4576 int mds, int drop, int unless)
4577{
4578 struct dentry *parent = NULL;
4579 struct ceph_mds_request_release *rel = *p;
4580 struct ceph_dentry_info *di = ceph_dentry(dentry);
4581 int force = 0;
4582 int ret;
4583
4584 /*
4585 * force an record for the directory caps if we have a dentry lease.
4586 * this is racy (can't take i_ceph_lock and d_lock together), but it
4587 * doesn't have to be perfect; the mds will revoke anything we don't
4588 * release.
4589 */
4590 spin_lock(&dentry->d_lock);
4591 if (di->lease_session && di->lease_session->s_mds == mds)
4592 force = 1;
4593 if (!dir) {
4594 parent = dget(dentry->d_parent);
4595 dir = d_inode(parent);
4596 }
4597 spin_unlock(&dentry->d_lock);
4598
4599 ret = ceph_encode_inode_release(p, dir, mds, drop, unless, force);
4600 dput(parent);
4601
4602 spin_lock(&dentry->d_lock);
4603 if (ret && di->lease_session && di->lease_session->s_mds == mds) {
4604 dout("encode_dentry_release %p mds%d seq %d\n",
4605 dentry, mds, (int)di->lease_seq);
4606 rel->dname_len = cpu_to_le32(dentry->d_name.len);
4607 memcpy(*p, dentry->d_name.name, dentry->d_name.len);
4608 *p += dentry->d_name.len;
4609 rel->dname_seq = cpu_to_le32(di->lease_seq);
4610 __ceph_mdsc_drop_dentry_lease(dentry);
4611 }
4612 spin_unlock(&dentry->d_lock);
4613 return ret;
4614}
4615
4616static int remove_capsnaps(struct ceph_mds_client *mdsc, struct inode *inode)
4617{
4618 struct ceph_inode_info *ci = ceph_inode(inode);
4619 struct ceph_cap_snap *capsnap;
4620 int capsnap_release = 0;
4621
4622 lockdep_assert_held(&ci->i_ceph_lock);
4623
4624 dout("removing capsnaps, ci is %p, inode is %p\n", ci, inode);
4625
4626 while (!list_empty(&ci->i_cap_snaps)) {
4627 capsnap = list_first_entry(&ci->i_cap_snaps,
4628 struct ceph_cap_snap, ci_item);
4629 __ceph_remove_capsnap(inode, capsnap, NULL, NULL);
4630 ceph_put_snap_context(capsnap->context);
4631 ceph_put_cap_snap(capsnap);
4632 capsnap_release++;
4633 }
4634 wake_up_all(&ci->i_cap_wq);
4635 wake_up_all(&mdsc->cap_flushing_wq);
4636 return capsnap_release;
4637}
4638
4639int ceph_purge_inode_cap(struct inode *inode, struct ceph_cap *cap, bool *invalidate)
4640{
4641 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
4642 struct ceph_mds_client *mdsc = fsc->mdsc;
4643 struct ceph_inode_info *ci = ceph_inode(inode);
4644 bool is_auth;
4645 bool dirty_dropped = false;
4646 int iputs = 0;
4647
4648 lockdep_assert_held(&ci->i_ceph_lock);
4649
4650 dout("removing cap %p, ci is %p, inode is %p\n",
4651 cap, ci, &ci->netfs.inode);
4652
4653 is_auth = (cap == ci->i_auth_cap);
4654 __ceph_remove_cap(cap, false);
4655 if (is_auth) {
4656 struct ceph_cap_flush *cf;
4657
4658 if (ceph_inode_is_shutdown(inode)) {
4659 if (inode->i_data.nrpages > 0)
4660 *invalidate = true;
4661 if (ci->i_wrbuffer_ref > 0)
4662 mapping_set_error(&inode->i_data, -EIO);
4663 }
4664
4665 spin_lock(&mdsc->cap_dirty_lock);
4666
4667 /* trash all of the cap flushes for this inode */
4668 while (!list_empty(&ci->i_cap_flush_list)) {
4669 cf = list_first_entry(&ci->i_cap_flush_list,
4670 struct ceph_cap_flush, i_list);
4671 list_del_init(&cf->g_list);
4672 list_del_init(&cf->i_list);
4673 if (!cf->is_capsnap)
4674 ceph_free_cap_flush(cf);
4675 }
4676
4677 if (!list_empty(&ci->i_dirty_item)) {
4678 pr_warn_ratelimited(
4679 " dropping dirty %s state for %p %lld\n",
4680 ceph_cap_string(ci->i_dirty_caps),
4681 inode, ceph_ino(inode));
4682 ci->i_dirty_caps = 0;
4683 list_del_init(&ci->i_dirty_item);
4684 dirty_dropped = true;
4685 }
4686 if (!list_empty(&ci->i_flushing_item)) {
4687 pr_warn_ratelimited(
4688 " dropping dirty+flushing %s state for %p %lld\n",
4689 ceph_cap_string(ci->i_flushing_caps),
4690 inode, ceph_ino(inode));
4691 ci->i_flushing_caps = 0;
4692 list_del_init(&ci->i_flushing_item);
4693 mdsc->num_cap_flushing--;
4694 dirty_dropped = true;
4695 }
4696 spin_unlock(&mdsc->cap_dirty_lock);
4697
4698 if (dirty_dropped) {
4699 mapping_set_error(inode->i_mapping, -EIO);
4700
4701 if (ci->i_wrbuffer_ref_head == 0 &&
4702 ci->i_wr_ref == 0 &&
4703 ci->i_dirty_caps == 0 &&
4704 ci->i_flushing_caps == 0) {
4705 ceph_put_snap_context(ci->i_head_snapc);
4706 ci->i_head_snapc = NULL;
4707 }
4708 }
4709
4710 if (atomic_read(&ci->i_filelock_ref) > 0) {
4711 /* make further file lock syscall return -EIO */
4712 ci->i_ceph_flags |= CEPH_I_ERROR_FILELOCK;
4713 pr_warn_ratelimited(" dropping file locks for %p %lld\n",
4714 inode, ceph_ino(inode));
4715 }
4716
4717 if (!ci->i_dirty_caps && ci->i_prealloc_cap_flush) {
4718 cf = ci->i_prealloc_cap_flush;
4719 ci->i_prealloc_cap_flush = NULL;
4720 if (!cf->is_capsnap)
4721 ceph_free_cap_flush(cf);
4722 }
4723
4724 if (!list_empty(&ci->i_cap_snaps))
4725 iputs = remove_capsnaps(mdsc, inode);
4726 }
4727 if (dirty_dropped)
4728 ++iputs;
4729 return iputs;
4730}