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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
224struct ceph_cap *ceph_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 */
511void 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 **new_cap)
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 *cap;
520 int mds = session->s_mds;
521 int actual_wanted;
522
523 dout("add_cap %p mds%d cap %llx %s seq %d\n", inode,
524 session->s_mds, cap_id, ceph_cap_string(issued), seq);
525
526 /*
527 * If we are opening the file, include file mode wanted bits
528 * in wanted.
529 */
530 if (fmode >= 0)
531 wanted |= ceph_caps_for_mode(fmode);
532
533 cap = __get_cap_for_mds(ci, mds);
534 if (!cap) {
535 cap = *new_cap;
536 *new_cap = NULL;
537
538 cap->issued = 0;
539 cap->implemented = 0;
540 cap->mds = mds;
541 cap->mds_wanted = 0;
542 cap->mseq = 0;
543
544 cap->ci = ci;
545 __insert_cap_node(ci, cap);
546
547 /* add to session cap list */
548 cap->session = session;
549 spin_lock(&session->s_cap_lock);
550 list_add_tail(&cap->session_caps, &session->s_caps);
551 session->s_nr_caps++;
552 spin_unlock(&session->s_cap_lock);
553 } else {
554 /*
555 * auth mds of the inode changed. we received the cap export
556 * message, but still haven't received the cap import message.
557 * handle_cap_export() updated the new auth MDS' cap.
558 *
559 * "ceph_seq_cmp(seq, cap->seq) <= 0" means we are processing
560 * a message that was send before the cap import message. So
561 * don't remove caps.
562 */
563 if (ceph_seq_cmp(seq, cap->seq) <= 0) {
564 WARN_ON(cap != ci->i_auth_cap);
565 WARN_ON(cap->cap_id != cap_id);
566 seq = cap->seq;
567 mseq = cap->mseq;
568 issued |= cap->issued;
569 flags |= CEPH_CAP_FLAG_AUTH;
570 }
571 }
572
573 if (!ci->i_snap_realm) {
574 /*
575 * add this inode to the appropriate snap realm
576 */
577 struct ceph_snap_realm *realm = ceph_lookup_snap_realm(mdsc,
578 realmino);
579 if (realm) {
580 spin_lock(&realm->inodes_with_caps_lock);
581 ci->i_snap_realm = realm;
582 list_add(&ci->i_snap_realm_item,
583 &realm->inodes_with_caps);
584 spin_unlock(&realm->inodes_with_caps_lock);
585 } else {
586 pr_err("ceph_add_cap: couldn't find snap realm %llx\n",
587 realmino);
588 WARN_ON(!realm);
589 }
590 }
591
592 __check_cap_issue(ci, cap, issued);
593
594 /*
595 * If we are issued caps we don't want, or the mds' wanted
596 * value appears to be off, queue a check so we'll release
597 * later and/or update the mds wanted value.
598 */
599 actual_wanted = __ceph_caps_wanted(ci);
600 if ((wanted & ~actual_wanted) ||
601 (issued & ~actual_wanted & CEPH_CAP_ANY_WR)) {
602 dout(" issued %s, mds wanted %s, actual %s, queueing\n",
603 ceph_cap_string(issued), ceph_cap_string(wanted),
604 ceph_cap_string(actual_wanted));
605 __cap_delay_requeue(mdsc, ci);
606 }
607
608 if (flags & CEPH_CAP_FLAG_AUTH) {
609 if (ci->i_auth_cap == NULL ||
610 ceph_seq_cmp(ci->i_auth_cap->mseq, mseq) < 0) {
611 ci->i_auth_cap = cap;
612 cap->mds_wanted = wanted;
613 }
614 } else {
615 WARN_ON(ci->i_auth_cap == cap);
616 }
617
618 dout("add_cap inode %p (%llx.%llx) cap %p %s now %s seq %d mds%d\n",
619 inode, ceph_vinop(inode), cap, ceph_cap_string(issued),
620 ceph_cap_string(issued|cap->issued), seq, mds);
621 cap->cap_id = cap_id;
622 cap->issued = issued;
623 cap->implemented |= issued;
624 if (ceph_seq_cmp(mseq, cap->mseq) > 0)
625 cap->mds_wanted = wanted;
626 else
627 cap->mds_wanted |= wanted;
628 cap->seq = seq;
629 cap->issue_seq = seq;
630 cap->mseq = mseq;
631 cap->cap_gen = session->s_cap_gen;
632
633 if (fmode >= 0)
634 __ceph_get_fmode(ci, fmode);
635}
636
637/*
638 * Return true if cap has not timed out and belongs to the current
639 * generation of the MDS session (i.e. has not gone 'stale' due to
640 * us losing touch with the mds).
641 */
642static int __cap_is_valid(struct ceph_cap *cap)
643{
644 unsigned long ttl;
645 u32 gen;
646
647 spin_lock(&cap->session->s_gen_ttl_lock);
648 gen = cap->session->s_cap_gen;
649 ttl = cap->session->s_cap_ttl;
650 spin_unlock(&cap->session->s_gen_ttl_lock);
651
652 if (cap->cap_gen < gen || time_after_eq(jiffies, ttl)) {
653 dout("__cap_is_valid %p cap %p issued %s "
654 "but STALE (gen %u vs %u)\n", &cap->ci->vfs_inode,
655 cap, ceph_cap_string(cap->issued), cap->cap_gen, gen);
656 return 0;
657 }
658
659 return 1;
660}
661
662/*
663 * Return set of valid cap bits issued to us. Note that caps time
664 * out, and may be invalidated in bulk if the client session times out
665 * and session->s_cap_gen is bumped.
666 */
667int __ceph_caps_issued(struct ceph_inode_info *ci, int *implemented)
668{
669 int have = ci->i_snap_caps;
670 struct ceph_cap *cap;
671 struct rb_node *p;
672
673 if (implemented)
674 *implemented = 0;
675 for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
676 cap = rb_entry(p, struct ceph_cap, ci_node);
677 if (!__cap_is_valid(cap))
678 continue;
679 dout("__ceph_caps_issued %p cap %p issued %s\n",
680 &ci->vfs_inode, cap, ceph_cap_string(cap->issued));
681 have |= cap->issued;
682 if (implemented)
683 *implemented |= cap->implemented;
684 }
685 /*
686 * exclude caps issued by non-auth MDS, but are been revoking
687 * by the auth MDS. The non-auth MDS should be revoking/exporting
688 * these caps, but the message is delayed.
689 */
690 if (ci->i_auth_cap) {
691 cap = ci->i_auth_cap;
692 have &= ~cap->implemented | cap->issued;
693 }
694 return have;
695}
696
697/*
698 * Get cap bits issued by caps other than @ocap
699 */
700int __ceph_caps_issued_other(struct ceph_inode_info *ci, struct ceph_cap *ocap)
701{
702 int have = ci->i_snap_caps;
703 struct ceph_cap *cap;
704 struct rb_node *p;
705
706 for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
707 cap = rb_entry(p, struct ceph_cap, ci_node);
708 if (cap == ocap)
709 continue;
710 if (!__cap_is_valid(cap))
711 continue;
712 have |= cap->issued;
713 }
714 return have;
715}
716
717/*
718 * Move a cap to the end of the LRU (oldest caps at list head, newest
719 * at list tail).
720 */
721static void __touch_cap(struct ceph_cap *cap)
722{
723 struct ceph_mds_session *s = cap->session;
724
725 spin_lock(&s->s_cap_lock);
726 if (s->s_cap_iterator == NULL) {
727 dout("__touch_cap %p cap %p mds%d\n", &cap->ci->vfs_inode, cap,
728 s->s_mds);
729 list_move_tail(&cap->session_caps, &s->s_caps);
730 } else {
731 dout("__touch_cap %p cap %p mds%d NOP, iterating over caps\n",
732 &cap->ci->vfs_inode, cap, s->s_mds);
733 }
734 spin_unlock(&s->s_cap_lock);
735}
736
737/*
738 * Check if we hold the given mask. If so, move the cap(s) to the
739 * front of their respective LRUs. (This is the preferred way for
740 * callers to check for caps they want.)
741 */
742int __ceph_caps_issued_mask(struct ceph_inode_info *ci, int mask, int touch)
743{
744 struct ceph_cap *cap;
745 struct rb_node *p;
746 int have = ci->i_snap_caps;
747
748 if ((have & mask) == mask) {
749 dout("__ceph_caps_issued_mask %p snap issued %s"
750 " (mask %s)\n", &ci->vfs_inode,
751 ceph_cap_string(have),
752 ceph_cap_string(mask));
753 return 1;
754 }
755
756 for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
757 cap = rb_entry(p, struct ceph_cap, ci_node);
758 if (!__cap_is_valid(cap))
759 continue;
760 if ((cap->issued & mask) == mask) {
761 dout("__ceph_caps_issued_mask %p cap %p issued %s"
762 " (mask %s)\n", &ci->vfs_inode, cap,
763 ceph_cap_string(cap->issued),
764 ceph_cap_string(mask));
765 if (touch)
766 __touch_cap(cap);
767 return 1;
768 }
769
770 /* does a combination of caps satisfy mask? */
771 have |= cap->issued;
772 if ((have & mask) == mask) {
773 dout("__ceph_caps_issued_mask %p combo issued %s"
774 " (mask %s)\n", &ci->vfs_inode,
775 ceph_cap_string(cap->issued),
776 ceph_cap_string(mask));
777 if (touch) {
778 struct rb_node *q;
779
780 /* touch this + preceding caps */
781 __touch_cap(cap);
782 for (q = rb_first(&ci->i_caps); q != p;
783 q = rb_next(q)) {
784 cap = rb_entry(q, struct ceph_cap,
785 ci_node);
786 if (!__cap_is_valid(cap))
787 continue;
788 __touch_cap(cap);
789 }
790 }
791 return 1;
792 }
793 }
794
795 return 0;
796}
797
798/*
799 * Return true if mask caps are currently being revoked by an MDS.
800 */
801int __ceph_caps_revoking_other(struct ceph_inode_info *ci,
802 struct ceph_cap *ocap, int mask)
803{
804 struct ceph_cap *cap;
805 struct rb_node *p;
806
807 for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
808 cap = rb_entry(p, struct ceph_cap, ci_node);
809 if (cap != ocap &&
810 (cap->implemented & ~cap->issued & mask))
811 return 1;
812 }
813 return 0;
814}
815
816int ceph_caps_revoking(struct ceph_inode_info *ci, int mask)
817{
818 struct inode *inode = &ci->vfs_inode;
819 int ret;
820
821 spin_lock(&ci->i_ceph_lock);
822 ret = __ceph_caps_revoking_other(ci, NULL, mask);
823 spin_unlock(&ci->i_ceph_lock);
824 dout("ceph_caps_revoking %p %s = %d\n", inode,
825 ceph_cap_string(mask), ret);
826 return ret;
827}
828
829int __ceph_caps_used(struct ceph_inode_info *ci)
830{
831 int used = 0;
832 if (ci->i_pin_ref)
833 used |= CEPH_CAP_PIN;
834 if (ci->i_rd_ref)
835 used |= CEPH_CAP_FILE_RD;
836 if (ci->i_rdcache_ref ||
837 (!S_ISDIR(ci->vfs_inode.i_mode) && /* ignore readdir cache */
838 ci->vfs_inode.i_data.nrpages))
839 used |= CEPH_CAP_FILE_CACHE;
840 if (ci->i_wr_ref)
841 used |= CEPH_CAP_FILE_WR;
842 if (ci->i_wb_ref || ci->i_wrbuffer_ref)
843 used |= CEPH_CAP_FILE_BUFFER;
844 return used;
845}
846
847/*
848 * wanted, by virtue of open file modes
849 */
850int __ceph_caps_file_wanted(struct ceph_inode_info *ci)
851{
852 int want = 0;
853 int mode;
854 for (mode = 0; mode < CEPH_FILE_MODE_NUM; mode++)
855 if (ci->i_nr_by_mode[mode])
856 want |= ceph_caps_for_mode(mode);
857 return want;
858}
859
860/*
861 * Return caps we have registered with the MDS(s) as 'wanted'.
862 */
863int __ceph_caps_mds_wanted(struct ceph_inode_info *ci)
864{
865 struct ceph_cap *cap;
866 struct rb_node *p;
867 int mds_wanted = 0;
868
869 for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
870 cap = rb_entry(p, struct ceph_cap, ci_node);
871 if (!__cap_is_valid(cap))
872 continue;
873 if (cap == ci->i_auth_cap)
874 mds_wanted |= cap->mds_wanted;
875 else
876 mds_wanted |= (cap->mds_wanted & ~CEPH_CAP_ANY_FILE_WR);
877 }
878 return mds_wanted;
879}
880
881/*
882 * called under i_ceph_lock
883 */
884static int __ceph_is_any_caps(struct ceph_inode_info *ci)
885{
886 return !RB_EMPTY_ROOT(&ci->i_caps);
887}
888
889int ceph_is_any_caps(struct inode *inode)
890{
891 struct ceph_inode_info *ci = ceph_inode(inode);
892 int ret;
893
894 spin_lock(&ci->i_ceph_lock);
895 ret = __ceph_is_any_caps(ci);
896 spin_unlock(&ci->i_ceph_lock);
897
898 return ret;
899}
900
901static void drop_inode_snap_realm(struct ceph_inode_info *ci)
902{
903 struct ceph_snap_realm *realm = ci->i_snap_realm;
904 spin_lock(&realm->inodes_with_caps_lock);
905 list_del_init(&ci->i_snap_realm_item);
906 ci->i_snap_realm_counter++;
907 ci->i_snap_realm = NULL;
908 spin_unlock(&realm->inodes_with_caps_lock);
909 ceph_put_snap_realm(ceph_sb_to_client(ci->vfs_inode.i_sb)->mdsc,
910 realm);
911}
912
913/*
914 * Remove a cap. Take steps to deal with a racing iterate_session_caps.
915 *
916 * caller should hold i_ceph_lock.
917 * caller will not hold session s_mutex if called from destroy_inode.
918 */
919void __ceph_remove_cap(struct ceph_cap *cap, bool queue_release)
920{
921 struct ceph_mds_session *session = cap->session;
922 struct ceph_inode_info *ci = cap->ci;
923 struct ceph_mds_client *mdsc =
924 ceph_sb_to_client(ci->vfs_inode.i_sb)->mdsc;
925 int removed = 0;
926
927 dout("__ceph_remove_cap %p from %p\n", cap, &ci->vfs_inode);
928
929 /* remove from session list */
930 spin_lock(&session->s_cap_lock);
931 if (session->s_cap_iterator == cap) {
932 /* not yet, we are iterating over this very cap */
933 dout("__ceph_remove_cap delaying %p removal from session %p\n",
934 cap, cap->session);
935 } else {
936 list_del_init(&cap->session_caps);
937 session->s_nr_caps--;
938 cap->session = NULL;
939 removed = 1;
940 }
941 /* protect backpointer with s_cap_lock: see iterate_session_caps */
942 cap->ci = NULL;
943
944 /*
945 * s_cap_reconnect is protected by s_cap_lock. no one changes
946 * s_cap_gen while session is in the reconnect state.
947 */
948 if (queue_release &&
949 (!session->s_cap_reconnect || cap->cap_gen == session->s_cap_gen)) {
950 cap->queue_release = 1;
951 if (removed) {
952 list_add_tail(&cap->session_caps,
953 &session->s_cap_releases);
954 session->s_num_cap_releases++;
955 removed = 0;
956 }
957 } else {
958 cap->queue_release = 0;
959 }
960 cap->cap_ino = ci->i_vino.ino;
961
962 spin_unlock(&session->s_cap_lock);
963
964 /* remove from inode list */
965 rb_erase(&cap->ci_node, &ci->i_caps);
966 if (ci->i_auth_cap == cap)
967 ci->i_auth_cap = NULL;
968
969 if (removed)
970 ceph_put_cap(mdsc, cap);
971
972 /* when reconnect denied, we remove session caps forcibly,
973 * i_wr_ref can be non-zero. If there are ongoing write,
974 * keep i_snap_realm.
975 */
976 if (!__ceph_is_any_caps(ci) && ci->i_wr_ref == 0 && ci->i_snap_realm)
977 drop_inode_snap_realm(ci);
978
979 if (!__ceph_is_any_real_caps(ci))
980 __cap_delay_cancel(mdsc, ci);
981}
982
983/*
984 * Build and send a cap message to the given MDS.
985 *
986 * Caller should be holding s_mutex.
987 */
988static int send_cap_msg(struct ceph_mds_session *session,
989 u64 ino, u64 cid, int op,
990 int caps, int wanted, int dirty,
991 u32 seq, u64 flush_tid, u64 oldest_flush_tid,
992 u32 issue_seq, u32 mseq, u64 size, u64 max_size,
993 struct timespec *mtime, struct timespec *atime,
994 struct timespec *ctime, u64 time_warp_seq,
995 kuid_t uid, kgid_t gid, umode_t mode,
996 u64 xattr_version,
997 struct ceph_buffer *xattrs_buf,
998 u64 follows, bool inline_data)
999{
1000 struct ceph_mds_caps *fc;
1001 struct ceph_msg *msg;
1002 void *p;
1003 size_t extra_len;
1004
1005 dout("send_cap_msg %s %llx %llx caps %s wanted %s dirty %s"
1006 " seq %u/%u tid %llu/%llu mseq %u follows %lld size %llu/%llu"
1007 " xattr_ver %llu xattr_len %d\n", ceph_cap_op_name(op),
1008 cid, ino, ceph_cap_string(caps), ceph_cap_string(wanted),
1009 ceph_cap_string(dirty),
1010 seq, issue_seq, flush_tid, oldest_flush_tid,
1011 mseq, follows, size, max_size,
1012 xattr_version, xattrs_buf ? (int)xattrs_buf->vec.iov_len : 0);
1013
1014 /* flock buffer size + inline version + inline data size +
1015 * osd_epoch_barrier + oldest_flush_tid */
1016 extra_len = 4 + 8 + 4 + 4 + 8;
1017 msg = ceph_msg_new(CEPH_MSG_CLIENT_CAPS, sizeof(*fc) + extra_len,
1018 GFP_NOFS, false);
1019 if (!msg)
1020 return -ENOMEM;
1021
1022 msg->hdr.version = cpu_to_le16(6);
1023 msg->hdr.tid = cpu_to_le64(flush_tid);
1024
1025 fc = msg->front.iov_base;
1026 memset(fc, 0, sizeof(*fc));
1027
1028 fc->cap_id = cpu_to_le64(cid);
1029 fc->op = cpu_to_le32(op);
1030 fc->seq = cpu_to_le32(seq);
1031 fc->issue_seq = cpu_to_le32(issue_seq);
1032 fc->migrate_seq = cpu_to_le32(mseq);
1033 fc->caps = cpu_to_le32(caps);
1034 fc->wanted = cpu_to_le32(wanted);
1035 fc->dirty = cpu_to_le32(dirty);
1036 fc->ino = cpu_to_le64(ino);
1037 fc->snap_follows = cpu_to_le64(follows);
1038
1039 fc->size = cpu_to_le64(size);
1040 fc->max_size = cpu_to_le64(max_size);
1041 if (mtime)
1042 ceph_encode_timespec(&fc->mtime, mtime);
1043 if (atime)
1044 ceph_encode_timespec(&fc->atime, atime);
1045 if (ctime)
1046 ceph_encode_timespec(&fc->ctime, ctime);
1047 fc->time_warp_seq = cpu_to_le32(time_warp_seq);
1048
1049 fc->uid = cpu_to_le32(from_kuid(&init_user_ns, uid));
1050 fc->gid = cpu_to_le32(from_kgid(&init_user_ns, gid));
1051 fc->mode = cpu_to_le32(mode);
1052
1053 p = fc + 1;
1054 /* flock buffer size */
1055 ceph_encode_32(&p, 0);
1056 /* inline version */
1057 ceph_encode_64(&p, inline_data ? 0 : CEPH_INLINE_NONE);
1058 /* inline data size */
1059 ceph_encode_32(&p, 0);
1060 /* osd_epoch_barrier */
1061 ceph_encode_32(&p, 0);
1062 /* oldest_flush_tid */
1063 ceph_encode_64(&p, oldest_flush_tid);
1064
1065 fc->xattr_version = cpu_to_le64(xattr_version);
1066 if (xattrs_buf) {
1067 msg->middle = ceph_buffer_get(xattrs_buf);
1068 fc->xattr_len = cpu_to_le32(xattrs_buf->vec.iov_len);
1069 msg->hdr.middle_len = cpu_to_le32(xattrs_buf->vec.iov_len);
1070 }
1071
1072 ceph_con_send(&session->s_con, msg);
1073 return 0;
1074}
1075
1076/*
1077 * Queue cap releases when an inode is dropped from our cache. Since
1078 * inode is about to be destroyed, there is no need for i_ceph_lock.
1079 */
1080void ceph_queue_caps_release(struct inode *inode)
1081{
1082 struct ceph_inode_info *ci = ceph_inode(inode);
1083 struct rb_node *p;
1084
1085 p = rb_first(&ci->i_caps);
1086 while (p) {
1087 struct ceph_cap *cap = rb_entry(p, struct ceph_cap, ci_node);
1088 p = rb_next(p);
1089 __ceph_remove_cap(cap, true);
1090 }
1091}
1092
1093/*
1094 * Send a cap msg on the given inode. Update our caps state, then
1095 * drop i_ceph_lock and send the message.
1096 *
1097 * Make note of max_size reported/requested from mds, revoked caps
1098 * that have now been implemented.
1099 *
1100 * Make half-hearted attempt ot to invalidate page cache if we are
1101 * dropping RDCACHE. Note that this will leave behind locked pages
1102 * that we'll then need to deal with elsewhere.
1103 *
1104 * Return non-zero if delayed release, or we experienced an error
1105 * such that the caller should requeue + retry later.
1106 *
1107 * called with i_ceph_lock, then drops it.
1108 * caller should hold snap_rwsem (read), s_mutex.
1109 */
1110static int __send_cap(struct ceph_mds_client *mdsc, struct ceph_cap *cap,
1111 int op, int used, int want, int retain, int flushing,
1112 u64 flush_tid, u64 oldest_flush_tid)
1113 __releases(cap->ci->i_ceph_lock)
1114{
1115 struct ceph_inode_info *ci = cap->ci;
1116 struct inode *inode = &ci->vfs_inode;
1117 u64 cap_id = cap->cap_id;
1118 int held, revoking, dropping, keep;
1119 u64 seq, issue_seq, mseq, time_warp_seq, follows;
1120 u64 size, max_size;
1121 struct timespec mtime, atime, ctime;
1122 int wake = 0;
1123 umode_t mode;
1124 kuid_t uid;
1125 kgid_t gid;
1126 struct ceph_mds_session *session;
1127 u64 xattr_version = 0;
1128 struct ceph_buffer *xattr_blob = NULL;
1129 int delayed = 0;
1130 int ret;
1131 bool inline_data;
1132
1133 held = cap->issued | cap->implemented;
1134 revoking = cap->implemented & ~cap->issued;
1135 retain &= ~revoking;
1136 dropping = cap->issued & ~retain;
1137
1138 dout("__send_cap %p cap %p session %p %s -> %s (revoking %s)\n",
1139 inode, cap, cap->session,
1140 ceph_cap_string(held), ceph_cap_string(held & retain),
1141 ceph_cap_string(revoking));
1142 BUG_ON((retain & CEPH_CAP_PIN) == 0);
1143
1144 session = cap->session;
1145
1146 /* don't release wanted unless we've waited a bit. */
1147 if ((ci->i_ceph_flags & CEPH_I_NODELAY) == 0 &&
1148 time_before(jiffies, ci->i_hold_caps_min)) {
1149 dout(" delaying issued %s -> %s, wanted %s -> %s on send\n",
1150 ceph_cap_string(cap->issued),
1151 ceph_cap_string(cap->issued & retain),
1152 ceph_cap_string(cap->mds_wanted),
1153 ceph_cap_string(want));
1154 want |= cap->mds_wanted;
1155 retain |= cap->issued;
1156 delayed = 1;
1157 }
1158 ci->i_ceph_flags &= ~(CEPH_I_NODELAY | CEPH_I_FLUSH);
1159
1160 cap->issued &= retain; /* drop bits we don't want */
1161 if (cap->implemented & ~cap->issued) {
1162 /*
1163 * Wake up any waiters on wanted -> needed transition.
1164 * This is due to the weird transition from buffered
1165 * to sync IO... we need to flush dirty pages _before_
1166 * allowing sync writes to avoid reordering.
1167 */
1168 wake = 1;
1169 }
1170 cap->implemented &= cap->issued | used;
1171 cap->mds_wanted = want;
1172
1173 follows = flushing ? ci->i_head_snapc->seq : 0;
1174
1175 keep = cap->implemented;
1176 seq = cap->seq;
1177 issue_seq = cap->issue_seq;
1178 mseq = cap->mseq;
1179 size = inode->i_size;
1180 ci->i_reported_size = size;
1181 max_size = ci->i_wanted_max_size;
1182 ci->i_requested_max_size = max_size;
1183 mtime = inode->i_mtime;
1184 atime = inode->i_atime;
1185 ctime = inode->i_ctime;
1186 time_warp_seq = ci->i_time_warp_seq;
1187 uid = inode->i_uid;
1188 gid = inode->i_gid;
1189 mode = inode->i_mode;
1190
1191 if (flushing & CEPH_CAP_XATTR_EXCL) {
1192 __ceph_build_xattrs_blob(ci);
1193 xattr_blob = ci->i_xattrs.blob;
1194 xattr_version = ci->i_xattrs.version;
1195 }
1196
1197 inline_data = ci->i_inline_version != CEPH_INLINE_NONE;
1198
1199 spin_unlock(&ci->i_ceph_lock);
1200
1201 ret = send_cap_msg(session, ceph_vino(inode).ino, cap_id,
1202 op, keep, want, flushing, seq,
1203 flush_tid, oldest_flush_tid, issue_seq, mseq,
1204 size, max_size, &mtime, &atime, &ctime, time_warp_seq,
1205 uid, gid, mode, xattr_version, xattr_blob,
1206 follows, inline_data);
1207 if (ret < 0) {
1208 dout("error sending cap msg, must requeue %p\n", inode);
1209 delayed = 1;
1210 }
1211
1212 if (wake)
1213 wake_up_all(&ci->i_cap_wq);
1214
1215 return delayed;
1216}
1217
1218/*
1219 * When a snapshot is taken, clients accumulate dirty metadata on
1220 * inodes with capabilities in ceph_cap_snaps to describe the file
1221 * state at the time the snapshot was taken. This must be flushed
1222 * asynchronously back to the MDS once sync writes complete and dirty
1223 * data is written out.
1224 *
1225 * Unless @kick is true, skip cap_snaps that were already sent to
1226 * the MDS (i.e., during this session).
1227 *
1228 * Called under i_ceph_lock. Takes s_mutex as needed.
1229 */
1230void __ceph_flush_snaps(struct ceph_inode_info *ci,
1231 struct ceph_mds_session **psession,
1232 int kick)
1233 __releases(ci->i_ceph_lock)
1234 __acquires(ci->i_ceph_lock)
1235{
1236 struct inode *inode = &ci->vfs_inode;
1237 int mds;
1238 struct ceph_cap_snap *capsnap;
1239 u32 mseq;
1240 struct ceph_mds_client *mdsc = ceph_inode_to_client(inode)->mdsc;
1241 struct ceph_mds_session *session = NULL; /* if session != NULL, we hold
1242 session->s_mutex */
1243 u64 next_follows = 0; /* keep track of how far we've gotten through the
1244 i_cap_snaps list, and skip these entries next time
1245 around to avoid an infinite loop */
1246
1247 if (psession)
1248 session = *psession;
1249
1250 dout("__flush_snaps %p\n", inode);
1251retry:
1252 list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) {
1253 /* avoid an infiniute loop after retry */
1254 if (capsnap->follows < next_follows)
1255 continue;
1256 /*
1257 * we need to wait for sync writes to complete and for dirty
1258 * pages to be written out.
1259 */
1260 if (capsnap->dirty_pages || capsnap->writing)
1261 break;
1262
1263 /* should be removed by ceph_try_drop_cap_snap() */
1264 BUG_ON(!capsnap->need_flush);
1265
1266 /* pick mds, take s_mutex */
1267 if (ci->i_auth_cap == NULL) {
1268 dout("no auth cap (migrating?), doing nothing\n");
1269 goto out;
1270 }
1271
1272 /* only flush each capsnap once */
1273 if (!kick && !list_empty(&capsnap->flushing_item)) {
1274 dout("already flushed %p, skipping\n", capsnap);
1275 continue;
1276 }
1277
1278 mds = ci->i_auth_cap->session->s_mds;
1279 mseq = ci->i_auth_cap->mseq;
1280
1281 if (session && session->s_mds != mds) {
1282 dout("oops, wrong session %p mutex\n", session);
1283 if (kick)
1284 goto out;
1285
1286 mutex_unlock(&session->s_mutex);
1287 ceph_put_mds_session(session);
1288 session = NULL;
1289 }
1290 if (!session) {
1291 spin_unlock(&ci->i_ceph_lock);
1292 mutex_lock(&mdsc->mutex);
1293 session = __ceph_lookup_mds_session(mdsc, mds);
1294 mutex_unlock(&mdsc->mutex);
1295 if (session) {
1296 dout("inverting session/ino locks on %p\n",
1297 session);
1298 mutex_lock(&session->s_mutex);
1299 }
1300 /*
1301 * if session == NULL, we raced against a cap
1302 * deletion or migration. retry, and we'll
1303 * get a better @mds value next time.
1304 */
1305 spin_lock(&ci->i_ceph_lock);
1306 goto retry;
1307 }
1308
1309 spin_lock(&mdsc->cap_dirty_lock);
1310 capsnap->flush_tid = ++mdsc->last_cap_flush_tid;
1311 spin_unlock(&mdsc->cap_dirty_lock);
1312
1313 atomic_inc(&capsnap->nref);
1314 if (list_empty(&capsnap->flushing_item))
1315 list_add_tail(&capsnap->flushing_item,
1316 &session->s_cap_snaps_flushing);
1317 spin_unlock(&ci->i_ceph_lock);
1318
1319 dout("flush_snaps %p cap_snap %p follows %lld tid %llu\n",
1320 inode, capsnap, capsnap->follows, capsnap->flush_tid);
1321 send_cap_msg(session, ceph_vino(inode).ino, 0,
1322 CEPH_CAP_OP_FLUSHSNAP, capsnap->issued, 0,
1323 capsnap->dirty, 0, capsnap->flush_tid, 0,
1324 0, mseq, capsnap->size, 0,
1325 &capsnap->mtime, &capsnap->atime,
1326 &capsnap->ctime, capsnap->time_warp_seq,
1327 capsnap->uid, capsnap->gid, capsnap->mode,
1328 capsnap->xattr_version, capsnap->xattr_blob,
1329 capsnap->follows, capsnap->inline_data);
1330
1331 next_follows = capsnap->follows + 1;
1332 ceph_put_cap_snap(capsnap);
1333
1334 spin_lock(&ci->i_ceph_lock);
1335 goto retry;
1336 }
1337
1338 /* we flushed them all; remove this inode from the queue */
1339 spin_lock(&mdsc->snap_flush_lock);
1340 list_del_init(&ci->i_snap_flush_item);
1341 spin_unlock(&mdsc->snap_flush_lock);
1342
1343out:
1344 if (psession)
1345 *psession = session;
1346 else if (session) {
1347 mutex_unlock(&session->s_mutex);
1348 ceph_put_mds_session(session);
1349 }
1350}
1351
1352static void ceph_flush_snaps(struct ceph_inode_info *ci)
1353{
1354 spin_lock(&ci->i_ceph_lock);
1355 __ceph_flush_snaps(ci, NULL, 0);
1356 spin_unlock(&ci->i_ceph_lock);
1357}
1358
1359/*
1360 * Mark caps dirty. If inode is newly dirty, return the dirty flags.
1361 * Caller is then responsible for calling __mark_inode_dirty with the
1362 * returned flags value.
1363 */
1364int __ceph_mark_dirty_caps(struct ceph_inode_info *ci, int mask,
1365 struct ceph_cap_flush **pcf)
1366{
1367 struct ceph_mds_client *mdsc =
1368 ceph_sb_to_client(ci->vfs_inode.i_sb)->mdsc;
1369 struct inode *inode = &ci->vfs_inode;
1370 int was = ci->i_dirty_caps;
1371 int dirty = 0;
1372
1373 if (!ci->i_auth_cap) {
1374 pr_warn("__mark_dirty_caps %p %llx mask %s, "
1375 "but no auth cap (session was closed?)\n",
1376 inode, ceph_ino(inode), ceph_cap_string(mask));
1377 return 0;
1378 }
1379
1380 dout("__mark_dirty_caps %p %s dirty %s -> %s\n", &ci->vfs_inode,
1381 ceph_cap_string(mask), ceph_cap_string(was),
1382 ceph_cap_string(was | mask));
1383 ci->i_dirty_caps |= mask;
1384 if (was == 0) {
1385 WARN_ON_ONCE(ci->i_prealloc_cap_flush);
1386 swap(ci->i_prealloc_cap_flush, *pcf);
1387
1388 if (!ci->i_head_snapc) {
1389 WARN_ON_ONCE(!rwsem_is_locked(&mdsc->snap_rwsem));
1390 ci->i_head_snapc = ceph_get_snap_context(
1391 ci->i_snap_realm->cached_context);
1392 }
1393 dout(" inode %p now dirty snapc %p auth cap %p\n",
1394 &ci->vfs_inode, ci->i_head_snapc, ci->i_auth_cap);
1395 BUG_ON(!list_empty(&ci->i_dirty_item));
1396 spin_lock(&mdsc->cap_dirty_lock);
1397 list_add(&ci->i_dirty_item, &mdsc->cap_dirty);
1398 spin_unlock(&mdsc->cap_dirty_lock);
1399 if (ci->i_flushing_caps == 0) {
1400 ihold(inode);
1401 dirty |= I_DIRTY_SYNC;
1402 }
1403 } else {
1404 WARN_ON_ONCE(!ci->i_prealloc_cap_flush);
1405 }
1406 BUG_ON(list_empty(&ci->i_dirty_item));
1407 if (((was | ci->i_flushing_caps) & CEPH_CAP_FILE_BUFFER) &&
1408 (mask & CEPH_CAP_FILE_BUFFER))
1409 dirty |= I_DIRTY_DATASYNC;
1410 __cap_delay_requeue(mdsc, ci);
1411 return dirty;
1412}
1413
1414static void __add_cap_flushing_to_inode(struct ceph_inode_info *ci,
1415 struct ceph_cap_flush *cf)
1416{
1417 struct rb_node **p = &ci->i_cap_flush_tree.rb_node;
1418 struct rb_node *parent = NULL;
1419 struct ceph_cap_flush *other = NULL;
1420
1421 while (*p) {
1422 parent = *p;
1423 other = rb_entry(parent, struct ceph_cap_flush, i_node);
1424
1425 if (cf->tid < other->tid)
1426 p = &(*p)->rb_left;
1427 else if (cf->tid > other->tid)
1428 p = &(*p)->rb_right;
1429 else
1430 BUG();
1431 }
1432
1433 rb_link_node(&cf->i_node, parent, p);
1434 rb_insert_color(&cf->i_node, &ci->i_cap_flush_tree);
1435}
1436
1437static void __add_cap_flushing_to_mdsc(struct ceph_mds_client *mdsc,
1438 struct ceph_cap_flush *cf)
1439{
1440 struct rb_node **p = &mdsc->cap_flush_tree.rb_node;
1441 struct rb_node *parent = NULL;
1442 struct ceph_cap_flush *other = NULL;
1443
1444 while (*p) {
1445 parent = *p;
1446 other = rb_entry(parent, struct ceph_cap_flush, g_node);
1447
1448 if (cf->tid < other->tid)
1449 p = &(*p)->rb_left;
1450 else if (cf->tid > other->tid)
1451 p = &(*p)->rb_right;
1452 else
1453 BUG();
1454 }
1455
1456 rb_link_node(&cf->g_node, parent, p);
1457 rb_insert_color(&cf->g_node, &mdsc->cap_flush_tree);
1458}
1459
1460struct ceph_cap_flush *ceph_alloc_cap_flush(void)
1461{
1462 return kmem_cache_alloc(ceph_cap_flush_cachep, GFP_KERNEL);
1463}
1464
1465void ceph_free_cap_flush(struct ceph_cap_flush *cf)
1466{
1467 if (cf)
1468 kmem_cache_free(ceph_cap_flush_cachep, cf);
1469}
1470
1471static u64 __get_oldest_flush_tid(struct ceph_mds_client *mdsc)
1472{
1473 struct rb_node *n = rb_first(&mdsc->cap_flush_tree);
1474 if (n) {
1475 struct ceph_cap_flush *cf =
1476 rb_entry(n, struct ceph_cap_flush, g_node);
1477 return cf->tid;
1478 }
1479 return 0;
1480}
1481
1482/*
1483 * Add dirty inode to the flushing list. Assigned a seq number so we
1484 * can wait for caps to flush without starving.
1485 *
1486 * Called under i_ceph_lock.
1487 */
1488static int __mark_caps_flushing(struct inode *inode,
1489 struct ceph_mds_session *session,
1490 u64 *flush_tid, u64 *oldest_flush_tid)
1491{
1492 struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
1493 struct ceph_inode_info *ci = ceph_inode(inode);
1494 struct ceph_cap_flush *cf = NULL;
1495 int flushing;
1496
1497 BUG_ON(ci->i_dirty_caps == 0);
1498 BUG_ON(list_empty(&ci->i_dirty_item));
1499 BUG_ON(!ci->i_prealloc_cap_flush);
1500
1501 flushing = ci->i_dirty_caps;
1502 dout("__mark_caps_flushing flushing %s, flushing_caps %s -> %s\n",
1503 ceph_cap_string(flushing),
1504 ceph_cap_string(ci->i_flushing_caps),
1505 ceph_cap_string(ci->i_flushing_caps | flushing));
1506 ci->i_flushing_caps |= flushing;
1507 ci->i_dirty_caps = 0;
1508 dout(" inode %p now !dirty\n", inode);
1509
1510 swap(cf, ci->i_prealloc_cap_flush);
1511 cf->caps = flushing;
1512
1513 spin_lock(&mdsc->cap_dirty_lock);
1514 list_del_init(&ci->i_dirty_item);
1515
1516 cf->tid = ++mdsc->last_cap_flush_tid;
1517 __add_cap_flushing_to_mdsc(mdsc, cf);
1518 *oldest_flush_tid = __get_oldest_flush_tid(mdsc);
1519
1520 if (list_empty(&ci->i_flushing_item)) {
1521 list_add_tail(&ci->i_flushing_item, &session->s_cap_flushing);
1522 mdsc->num_cap_flushing++;
1523 dout(" inode %p now flushing tid %llu\n", inode, cf->tid);
1524 } else {
1525 list_move_tail(&ci->i_flushing_item, &session->s_cap_flushing);
1526 dout(" inode %p now flushing (more) tid %llu\n",
1527 inode, cf->tid);
1528 }
1529 spin_unlock(&mdsc->cap_dirty_lock);
1530
1531 __add_cap_flushing_to_inode(ci, cf);
1532
1533 *flush_tid = cf->tid;
1534 return flushing;
1535}
1536
1537/*
1538 * try to invalidate mapping pages without blocking.
1539 */
1540static int try_nonblocking_invalidate(struct inode *inode)
1541{
1542 struct ceph_inode_info *ci = ceph_inode(inode);
1543 u32 invalidating_gen = ci->i_rdcache_gen;
1544
1545 spin_unlock(&ci->i_ceph_lock);
1546 invalidate_mapping_pages(&inode->i_data, 0, -1);
1547 spin_lock(&ci->i_ceph_lock);
1548
1549 if (inode->i_data.nrpages == 0 &&
1550 invalidating_gen == ci->i_rdcache_gen) {
1551 /* success. */
1552 dout("try_nonblocking_invalidate %p success\n", inode);
1553 /* save any racing async invalidate some trouble */
1554 ci->i_rdcache_revoking = ci->i_rdcache_gen - 1;
1555 return 0;
1556 }
1557 dout("try_nonblocking_invalidate %p failed\n", inode);
1558 return -1;
1559}
1560
1561/*
1562 * Swiss army knife function to examine currently used and wanted
1563 * versus held caps. Release, flush, ack revoked caps to mds as
1564 * appropriate.
1565 *
1566 * CHECK_CAPS_NODELAY - caller is delayed work and we should not delay
1567 * cap release further.
1568 * CHECK_CAPS_AUTHONLY - we should only check the auth cap
1569 * CHECK_CAPS_FLUSH - we should flush any dirty caps immediately, without
1570 * further delay.
1571 */
1572void ceph_check_caps(struct ceph_inode_info *ci, int flags,
1573 struct ceph_mds_session *session)
1574{
1575 struct ceph_fs_client *fsc = ceph_inode_to_client(&ci->vfs_inode);
1576 struct ceph_mds_client *mdsc = fsc->mdsc;
1577 struct inode *inode = &ci->vfs_inode;
1578 struct ceph_cap *cap;
1579 u64 flush_tid, oldest_flush_tid;
1580 int file_wanted, used, cap_used;
1581 int took_snap_rwsem = 0; /* true if mdsc->snap_rwsem held */
1582 int issued, implemented, want, retain, revoking, flushing = 0;
1583 int mds = -1; /* keep track of how far we've gone through i_caps list
1584 to avoid an infinite loop on retry */
1585 struct rb_node *p;
1586 int tried_invalidate = 0;
1587 int delayed = 0, sent = 0, force_requeue = 0, num;
1588 int queue_invalidate = 0;
1589 int is_delayed = flags & CHECK_CAPS_NODELAY;
1590
1591 /* if we are unmounting, flush any unused caps immediately. */
1592 if (mdsc->stopping)
1593 is_delayed = 1;
1594
1595 spin_lock(&ci->i_ceph_lock);
1596
1597 if (ci->i_ceph_flags & CEPH_I_FLUSH)
1598 flags |= CHECK_CAPS_FLUSH;
1599
1600 /* flush snaps first time around only */
1601 if (!list_empty(&ci->i_cap_snaps))
1602 __ceph_flush_snaps(ci, &session, 0);
1603 goto retry_locked;
1604retry:
1605 spin_lock(&ci->i_ceph_lock);
1606retry_locked:
1607 file_wanted = __ceph_caps_file_wanted(ci);
1608 used = __ceph_caps_used(ci);
1609 issued = __ceph_caps_issued(ci, &implemented);
1610 revoking = implemented & ~issued;
1611
1612 want = file_wanted;
1613 retain = file_wanted | used | CEPH_CAP_PIN;
1614 if (!mdsc->stopping && inode->i_nlink > 0) {
1615 if (file_wanted) {
1616 retain |= CEPH_CAP_ANY; /* be greedy */
1617 } else if (S_ISDIR(inode->i_mode) &&
1618 (issued & CEPH_CAP_FILE_SHARED) &&
1619 __ceph_dir_is_complete(ci)) {
1620 /*
1621 * If a directory is complete, we want to keep
1622 * the exclusive cap. So that MDS does not end up
1623 * revoking the shared cap on every create/unlink
1624 * operation.
1625 */
1626 want = CEPH_CAP_ANY_SHARED | CEPH_CAP_FILE_EXCL;
1627 retain |= want;
1628 } else {
1629
1630 retain |= CEPH_CAP_ANY_SHARED;
1631 /*
1632 * keep RD only if we didn't have the file open RW,
1633 * because then the mds would revoke it anyway to
1634 * journal max_size=0.
1635 */
1636 if (ci->i_max_size == 0)
1637 retain |= CEPH_CAP_ANY_RD;
1638 }
1639 }
1640
1641 dout("check_caps %p file_want %s used %s dirty %s flushing %s"
1642 " issued %s revoking %s retain %s %s%s%s\n", inode,
1643 ceph_cap_string(file_wanted),
1644 ceph_cap_string(used), ceph_cap_string(ci->i_dirty_caps),
1645 ceph_cap_string(ci->i_flushing_caps),
1646 ceph_cap_string(issued), ceph_cap_string(revoking),
1647 ceph_cap_string(retain),
1648 (flags & CHECK_CAPS_AUTHONLY) ? " AUTHONLY" : "",
1649 (flags & CHECK_CAPS_NODELAY) ? " NODELAY" : "",
1650 (flags & CHECK_CAPS_FLUSH) ? " FLUSH" : "");
1651
1652 /*
1653 * If we no longer need to hold onto old our caps, and we may
1654 * have cached pages, but don't want them, then try to invalidate.
1655 * If we fail, it's because pages are locked.... try again later.
1656 */
1657 if ((!is_delayed || mdsc->stopping) &&
1658 !S_ISDIR(inode->i_mode) && /* ignore readdir cache */
1659 ci->i_wrbuffer_ref == 0 && /* no dirty pages... */
1660 inode->i_data.nrpages && /* have cached pages */
1661 (revoking & (CEPH_CAP_FILE_CACHE|
1662 CEPH_CAP_FILE_LAZYIO)) && /* or revoking cache */
1663 !tried_invalidate) {
1664 dout("check_caps trying to invalidate on %p\n", inode);
1665 if (try_nonblocking_invalidate(inode) < 0) {
1666 if (revoking & (CEPH_CAP_FILE_CACHE|
1667 CEPH_CAP_FILE_LAZYIO)) {
1668 dout("check_caps queuing invalidate\n");
1669 queue_invalidate = 1;
1670 ci->i_rdcache_revoking = ci->i_rdcache_gen;
1671 } else {
1672 dout("check_caps failed to invalidate pages\n");
1673 /* we failed to invalidate pages. check these
1674 caps again later. */
1675 force_requeue = 1;
1676 __cap_set_timeouts(mdsc, ci);
1677 }
1678 }
1679 tried_invalidate = 1;
1680 goto retry_locked;
1681 }
1682
1683 num = 0;
1684 for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
1685 cap = rb_entry(p, struct ceph_cap, ci_node);
1686 num++;
1687
1688 /* avoid looping forever */
1689 if (mds >= cap->mds ||
1690 ((flags & CHECK_CAPS_AUTHONLY) && cap != ci->i_auth_cap))
1691 continue;
1692
1693 /* NOTE: no side-effects allowed, until we take s_mutex */
1694
1695 cap_used = used;
1696 if (ci->i_auth_cap && cap != ci->i_auth_cap)
1697 cap_used &= ~ci->i_auth_cap->issued;
1698
1699 revoking = cap->implemented & ~cap->issued;
1700 dout(" mds%d cap %p used %s issued %s implemented %s revoking %s\n",
1701 cap->mds, cap, ceph_cap_string(cap->issued),
1702 ceph_cap_string(cap_used),
1703 ceph_cap_string(cap->implemented),
1704 ceph_cap_string(revoking));
1705
1706 if (cap == ci->i_auth_cap &&
1707 (cap->issued & CEPH_CAP_FILE_WR)) {
1708 /* request larger max_size from MDS? */
1709 if (ci->i_wanted_max_size > ci->i_max_size &&
1710 ci->i_wanted_max_size > ci->i_requested_max_size) {
1711 dout("requesting new max_size\n");
1712 goto ack;
1713 }
1714
1715 /* approaching file_max? */
1716 if ((inode->i_size << 1) >= ci->i_max_size &&
1717 (ci->i_reported_size << 1) < ci->i_max_size) {
1718 dout("i_size approaching max_size\n");
1719 goto ack;
1720 }
1721 }
1722 /* flush anything dirty? */
1723 if (cap == ci->i_auth_cap && (flags & CHECK_CAPS_FLUSH) &&
1724 ci->i_dirty_caps) {
1725 dout("flushing dirty caps\n");
1726 goto ack;
1727 }
1728
1729 /* completed revocation? going down and there are no caps? */
1730 if (revoking && (revoking & cap_used) == 0) {
1731 dout("completed revocation of %s\n",
1732 ceph_cap_string(cap->implemented & ~cap->issued));
1733 goto ack;
1734 }
1735
1736 /* want more caps from mds? */
1737 if (want & ~(cap->mds_wanted | cap->issued))
1738 goto ack;
1739
1740 /* things we might delay */
1741 if ((cap->issued & ~retain) == 0 &&
1742 cap->mds_wanted == want)
1743 continue; /* nope, all good */
1744
1745 if (is_delayed)
1746 goto ack;
1747
1748 /* delay? */
1749 if ((ci->i_ceph_flags & CEPH_I_NODELAY) == 0 &&
1750 time_before(jiffies, ci->i_hold_caps_max)) {
1751 dout(" delaying issued %s -> %s, wanted %s -> %s\n",
1752 ceph_cap_string(cap->issued),
1753 ceph_cap_string(cap->issued & retain),
1754 ceph_cap_string(cap->mds_wanted),
1755 ceph_cap_string(want));
1756 delayed++;
1757 continue;
1758 }
1759
1760ack:
1761 if (ci->i_ceph_flags & CEPH_I_NOFLUSH) {
1762 dout(" skipping %p I_NOFLUSH set\n", inode);
1763 continue;
1764 }
1765
1766 if (session && session != cap->session) {
1767 dout("oops, wrong session %p mutex\n", session);
1768 mutex_unlock(&session->s_mutex);
1769 session = NULL;
1770 }
1771 if (!session) {
1772 session = cap->session;
1773 if (mutex_trylock(&session->s_mutex) == 0) {
1774 dout("inverting session/ino locks on %p\n",
1775 session);
1776 spin_unlock(&ci->i_ceph_lock);
1777 if (took_snap_rwsem) {
1778 up_read(&mdsc->snap_rwsem);
1779 took_snap_rwsem = 0;
1780 }
1781 mutex_lock(&session->s_mutex);
1782 goto retry;
1783 }
1784 }
1785 /* take snap_rwsem after session mutex */
1786 if (!took_snap_rwsem) {
1787 if (down_read_trylock(&mdsc->snap_rwsem) == 0) {
1788 dout("inverting snap/in locks on %p\n",
1789 inode);
1790 spin_unlock(&ci->i_ceph_lock);
1791 down_read(&mdsc->snap_rwsem);
1792 took_snap_rwsem = 1;
1793 goto retry;
1794 }
1795 took_snap_rwsem = 1;
1796 }
1797
1798 if (cap == ci->i_auth_cap && ci->i_dirty_caps) {
1799 flushing = __mark_caps_flushing(inode, session,
1800 &flush_tid,
1801 &oldest_flush_tid);
1802 } else {
1803 flushing = 0;
1804 flush_tid = 0;
1805 spin_lock(&mdsc->cap_dirty_lock);
1806 oldest_flush_tid = __get_oldest_flush_tid(mdsc);
1807 spin_unlock(&mdsc->cap_dirty_lock);
1808 }
1809
1810 mds = cap->mds; /* remember mds, so we don't repeat */
1811 sent++;
1812
1813 /* __send_cap drops i_ceph_lock */
1814 delayed += __send_cap(mdsc, cap, CEPH_CAP_OP_UPDATE, cap_used,
1815 want, retain, flushing,
1816 flush_tid, oldest_flush_tid);
1817 goto retry; /* retake i_ceph_lock and restart our cap scan. */
1818 }
1819
1820 /*
1821 * Reschedule delayed caps release if we delayed anything,
1822 * otherwise cancel.
1823 */
1824 if (delayed && is_delayed)
1825 force_requeue = 1; /* __send_cap delayed release; requeue */
1826 if (!delayed && !is_delayed)
1827 __cap_delay_cancel(mdsc, ci);
1828 else if (!is_delayed || force_requeue)
1829 __cap_delay_requeue(mdsc, ci);
1830
1831 spin_unlock(&ci->i_ceph_lock);
1832
1833 if (queue_invalidate)
1834 ceph_queue_invalidate(inode);
1835
1836 if (session)
1837 mutex_unlock(&session->s_mutex);
1838 if (took_snap_rwsem)
1839 up_read(&mdsc->snap_rwsem);
1840}
1841
1842/*
1843 * Try to flush dirty caps back to the auth mds.
1844 */
1845static int try_flush_caps(struct inode *inode, u64 *ptid)
1846{
1847 struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
1848 struct ceph_inode_info *ci = ceph_inode(inode);
1849 struct ceph_mds_session *session = NULL;
1850 int flushing = 0;
1851 u64 flush_tid = 0, oldest_flush_tid = 0;
1852
1853retry:
1854 spin_lock(&ci->i_ceph_lock);
1855 if (ci->i_ceph_flags & CEPH_I_NOFLUSH) {
1856 dout("try_flush_caps skipping %p I_NOFLUSH set\n", inode);
1857 goto out;
1858 }
1859 if (ci->i_dirty_caps && ci->i_auth_cap) {
1860 struct ceph_cap *cap = ci->i_auth_cap;
1861 int used = __ceph_caps_used(ci);
1862 int want = __ceph_caps_wanted(ci);
1863 int delayed;
1864
1865 if (!session || session != cap->session) {
1866 spin_unlock(&ci->i_ceph_lock);
1867 if (session)
1868 mutex_unlock(&session->s_mutex);
1869 session = cap->session;
1870 mutex_lock(&session->s_mutex);
1871 goto retry;
1872 }
1873 if (cap->session->s_state < CEPH_MDS_SESSION_OPEN)
1874 goto out;
1875
1876 flushing = __mark_caps_flushing(inode, session, &flush_tid,
1877 &oldest_flush_tid);
1878
1879 /* __send_cap drops i_ceph_lock */
1880 delayed = __send_cap(mdsc, cap, CEPH_CAP_OP_FLUSH, used, want,
1881 (cap->issued | cap->implemented),
1882 flushing, flush_tid, oldest_flush_tid);
1883
1884 if (delayed) {
1885 spin_lock(&ci->i_ceph_lock);
1886 __cap_delay_requeue(mdsc, ci);
1887 spin_unlock(&ci->i_ceph_lock);
1888 }
1889 } else {
1890 struct rb_node *n = rb_last(&ci->i_cap_flush_tree);
1891 if (n) {
1892 struct ceph_cap_flush *cf =
1893 rb_entry(n, struct ceph_cap_flush, i_node);
1894 flush_tid = cf->tid;
1895 }
1896 flushing = ci->i_flushing_caps;
1897 spin_unlock(&ci->i_ceph_lock);
1898 }
1899out:
1900 if (session)
1901 mutex_unlock(&session->s_mutex);
1902
1903 *ptid = flush_tid;
1904 return flushing;
1905}
1906
1907/*
1908 * Return true if we've flushed caps through the given flush_tid.
1909 */
1910static int caps_are_flushed(struct inode *inode, u64 flush_tid)
1911{
1912 struct ceph_inode_info *ci = ceph_inode(inode);
1913 struct ceph_cap_flush *cf;
1914 struct rb_node *n;
1915 int ret = 1;
1916
1917 spin_lock(&ci->i_ceph_lock);
1918 n = rb_first(&ci->i_cap_flush_tree);
1919 if (n) {
1920 cf = rb_entry(n, struct ceph_cap_flush, i_node);
1921 if (cf->tid <= flush_tid)
1922 ret = 0;
1923 }
1924 spin_unlock(&ci->i_ceph_lock);
1925 return ret;
1926}
1927
1928/*
1929 * Wait on any unsafe replies for the given inode. First wait on the
1930 * newest request, and make that the upper bound. Then, if there are
1931 * more requests, keep waiting on the oldest as long as it is still older
1932 * than the original request.
1933 */
1934static void sync_write_wait(struct inode *inode)
1935{
1936 struct ceph_inode_info *ci = ceph_inode(inode);
1937 struct list_head *head = &ci->i_unsafe_writes;
1938 struct ceph_osd_request *req;
1939 u64 last_tid;
1940
1941 if (!S_ISREG(inode->i_mode))
1942 return;
1943
1944 spin_lock(&ci->i_unsafe_lock);
1945 if (list_empty(head))
1946 goto out;
1947
1948 /* set upper bound as _last_ entry in chain */
1949 req = list_last_entry(head, struct ceph_osd_request,
1950 r_unsafe_item);
1951 last_tid = req->r_tid;
1952
1953 do {
1954 ceph_osdc_get_request(req);
1955 spin_unlock(&ci->i_unsafe_lock);
1956 dout("sync_write_wait on tid %llu (until %llu)\n",
1957 req->r_tid, last_tid);
1958 wait_for_completion(&req->r_safe_completion);
1959 spin_lock(&ci->i_unsafe_lock);
1960 ceph_osdc_put_request(req);
1961
1962 /*
1963 * from here on look at first entry in chain, since we
1964 * only want to wait for anything older than last_tid
1965 */
1966 if (list_empty(head))
1967 break;
1968 req = list_first_entry(head, struct ceph_osd_request,
1969 r_unsafe_item);
1970 } while (req->r_tid < last_tid);
1971out:
1972 spin_unlock(&ci->i_unsafe_lock);
1973}
1974
1975/*
1976 * wait for any unsafe requests to complete.
1977 */
1978static int unsafe_request_wait(struct inode *inode)
1979{
1980 struct ceph_inode_info *ci = ceph_inode(inode);
1981 struct ceph_mds_request *req1 = NULL, *req2 = NULL;
1982 int ret, err = 0;
1983
1984 spin_lock(&ci->i_unsafe_lock);
1985 if (S_ISDIR(inode->i_mode) && !list_empty(&ci->i_unsafe_dirops)) {
1986 req1 = list_last_entry(&ci->i_unsafe_dirops,
1987 struct ceph_mds_request,
1988 r_unsafe_dir_item);
1989 ceph_mdsc_get_request(req1);
1990 }
1991 if (!list_empty(&ci->i_unsafe_iops)) {
1992 req2 = list_last_entry(&ci->i_unsafe_iops,
1993 struct ceph_mds_request,
1994 r_unsafe_target_item);
1995 ceph_mdsc_get_request(req2);
1996 }
1997 spin_unlock(&ci->i_unsafe_lock);
1998
1999 dout("unsafe_requeset_wait %p wait on tid %llu %llu\n",
2000 inode, req1 ? req1->r_tid : 0ULL, req2 ? req2->r_tid : 0ULL);
2001 if (req1) {
2002 ret = !wait_for_completion_timeout(&req1->r_safe_completion,
2003 ceph_timeout_jiffies(req1->r_timeout));
2004 if (ret)
2005 err = -EIO;
2006 ceph_mdsc_put_request(req1);
2007 }
2008 if (req2) {
2009 ret = !wait_for_completion_timeout(&req2->r_safe_completion,
2010 ceph_timeout_jiffies(req2->r_timeout));
2011 if (ret)
2012 err = -EIO;
2013 ceph_mdsc_put_request(req2);
2014 }
2015 return err;
2016}
2017
2018int ceph_fsync(struct file *file, loff_t start, loff_t end, int datasync)
2019{
2020 struct inode *inode = file->f_mapping->host;
2021 struct ceph_inode_info *ci = ceph_inode(inode);
2022 u64 flush_tid;
2023 int ret;
2024 int dirty;
2025
2026 dout("fsync %p%s\n", inode, datasync ? " datasync" : "");
2027 sync_write_wait(inode);
2028
2029 ret = filemap_write_and_wait_range(inode->i_mapping, start, end);
2030 if (ret < 0)
2031 goto out;
2032
2033 if (datasync)
2034 goto out;
2035
2036 inode_lock(inode);
2037
2038 dirty = try_flush_caps(inode, &flush_tid);
2039 dout("fsync dirty caps are %s\n", ceph_cap_string(dirty));
2040
2041 ret = unsafe_request_wait(inode);
2042
2043 /*
2044 * only wait on non-file metadata writeback (the mds
2045 * can recover size and mtime, so we don't need to
2046 * wait for that)
2047 */
2048 if (!ret && (dirty & ~CEPH_CAP_ANY_FILE_WR)) {
2049 ret = wait_event_interruptible(ci->i_cap_wq,
2050 caps_are_flushed(inode, flush_tid));
2051 }
2052 inode_unlock(inode);
2053out:
2054 dout("fsync %p%s result=%d\n", inode, datasync ? " datasync" : "", ret);
2055 return ret;
2056}
2057
2058/*
2059 * Flush any dirty caps back to the mds. If we aren't asked to wait,
2060 * queue inode for flush but don't do so immediately, because we can
2061 * get by with fewer MDS messages if we wait for data writeback to
2062 * complete first.
2063 */
2064int ceph_write_inode(struct inode *inode, struct writeback_control *wbc)
2065{
2066 struct ceph_inode_info *ci = ceph_inode(inode);
2067 u64 flush_tid;
2068 int err = 0;
2069 int dirty;
2070 int wait = wbc->sync_mode == WB_SYNC_ALL;
2071
2072 dout("write_inode %p wait=%d\n", inode, wait);
2073 if (wait) {
2074 dirty = try_flush_caps(inode, &flush_tid);
2075 if (dirty)
2076 err = wait_event_interruptible(ci->i_cap_wq,
2077 caps_are_flushed(inode, flush_tid));
2078 } else {
2079 struct ceph_mds_client *mdsc =
2080 ceph_sb_to_client(inode->i_sb)->mdsc;
2081
2082 spin_lock(&ci->i_ceph_lock);
2083 if (__ceph_caps_dirty(ci))
2084 __cap_delay_requeue_front(mdsc, ci);
2085 spin_unlock(&ci->i_ceph_lock);
2086 }
2087 return err;
2088}
2089
2090/*
2091 * After a recovering MDS goes active, we need to resend any caps
2092 * we were flushing.
2093 *
2094 * Caller holds session->s_mutex.
2095 */
2096static void kick_flushing_capsnaps(struct ceph_mds_client *mdsc,
2097 struct ceph_mds_session *session)
2098{
2099 struct ceph_cap_snap *capsnap;
2100
2101 dout("kick_flushing_capsnaps mds%d\n", session->s_mds);
2102 list_for_each_entry(capsnap, &session->s_cap_snaps_flushing,
2103 flushing_item) {
2104 struct ceph_inode_info *ci = capsnap->ci;
2105 struct inode *inode = &ci->vfs_inode;
2106 struct ceph_cap *cap;
2107
2108 spin_lock(&ci->i_ceph_lock);
2109 cap = ci->i_auth_cap;
2110 if (cap && cap->session == session) {
2111 dout("kick_flushing_caps %p cap %p capsnap %p\n", inode,
2112 cap, capsnap);
2113 __ceph_flush_snaps(ci, &session, 1);
2114 } else {
2115 pr_err("%p auth cap %p not mds%d ???\n", inode,
2116 cap, session->s_mds);
2117 }
2118 spin_unlock(&ci->i_ceph_lock);
2119 }
2120}
2121
2122static int __kick_flushing_caps(struct ceph_mds_client *mdsc,
2123 struct ceph_mds_session *session,
2124 struct ceph_inode_info *ci)
2125{
2126 struct inode *inode = &ci->vfs_inode;
2127 struct ceph_cap *cap;
2128 struct ceph_cap_flush *cf;
2129 struct rb_node *n;
2130 int delayed = 0;
2131 u64 first_tid = 0;
2132 u64 oldest_flush_tid;
2133
2134 spin_lock(&mdsc->cap_dirty_lock);
2135 oldest_flush_tid = __get_oldest_flush_tid(mdsc);
2136 spin_unlock(&mdsc->cap_dirty_lock);
2137
2138 while (true) {
2139 spin_lock(&ci->i_ceph_lock);
2140 cap = ci->i_auth_cap;
2141 if (!(cap && cap->session == session)) {
2142 pr_err("%p auth cap %p not mds%d ???\n", inode,
2143 cap, session->s_mds);
2144 spin_unlock(&ci->i_ceph_lock);
2145 break;
2146 }
2147
2148 for (n = rb_first(&ci->i_cap_flush_tree); n; n = rb_next(n)) {
2149 cf = rb_entry(n, struct ceph_cap_flush, i_node);
2150 if (cf->tid >= first_tid)
2151 break;
2152 }
2153 if (!n) {
2154 spin_unlock(&ci->i_ceph_lock);
2155 break;
2156 }
2157
2158 cf = rb_entry(n, struct ceph_cap_flush, i_node);
2159
2160 first_tid = cf->tid + 1;
2161
2162 dout("kick_flushing_caps %p cap %p tid %llu %s\n", inode,
2163 cap, cf->tid, ceph_cap_string(cf->caps));
2164 delayed |= __send_cap(mdsc, cap, CEPH_CAP_OP_FLUSH,
2165 __ceph_caps_used(ci),
2166 __ceph_caps_wanted(ci),
2167 cap->issued | cap->implemented,
2168 cf->caps, cf->tid, oldest_flush_tid);
2169 }
2170 return delayed;
2171}
2172
2173void ceph_early_kick_flushing_caps(struct ceph_mds_client *mdsc,
2174 struct ceph_mds_session *session)
2175{
2176 struct ceph_inode_info *ci;
2177 struct ceph_cap *cap;
2178
2179 dout("early_kick_flushing_caps mds%d\n", session->s_mds);
2180 list_for_each_entry(ci, &session->s_cap_flushing, i_flushing_item) {
2181 spin_lock(&ci->i_ceph_lock);
2182 cap = ci->i_auth_cap;
2183 if (!(cap && cap->session == session)) {
2184 pr_err("%p auth cap %p not mds%d ???\n",
2185 &ci->vfs_inode, cap, session->s_mds);
2186 spin_unlock(&ci->i_ceph_lock);
2187 continue;
2188 }
2189
2190
2191 /*
2192 * if flushing caps were revoked, we re-send the cap flush
2193 * in client reconnect stage. This guarantees MDS * processes
2194 * the cap flush message before issuing the flushing caps to
2195 * other client.
2196 */
2197 if ((cap->issued & ci->i_flushing_caps) !=
2198 ci->i_flushing_caps) {
2199 spin_unlock(&ci->i_ceph_lock);
2200 if (!__kick_flushing_caps(mdsc, session, ci))
2201 continue;
2202 spin_lock(&ci->i_ceph_lock);
2203 }
2204
2205 spin_unlock(&ci->i_ceph_lock);
2206 }
2207}
2208
2209void ceph_kick_flushing_caps(struct ceph_mds_client *mdsc,
2210 struct ceph_mds_session *session)
2211{
2212 struct ceph_inode_info *ci;
2213
2214 kick_flushing_capsnaps(mdsc, session);
2215
2216 dout("kick_flushing_caps mds%d\n", session->s_mds);
2217 list_for_each_entry(ci, &session->s_cap_flushing, i_flushing_item) {
2218 int delayed = __kick_flushing_caps(mdsc, session, ci);
2219 if (delayed) {
2220 spin_lock(&ci->i_ceph_lock);
2221 __cap_delay_requeue(mdsc, ci);
2222 spin_unlock(&ci->i_ceph_lock);
2223 }
2224 }
2225}
2226
2227static void kick_flushing_inode_caps(struct ceph_mds_client *mdsc,
2228 struct ceph_mds_session *session,
2229 struct inode *inode)
2230{
2231 struct ceph_inode_info *ci = ceph_inode(inode);
2232 struct ceph_cap *cap;
2233
2234 spin_lock(&ci->i_ceph_lock);
2235 cap = ci->i_auth_cap;
2236 dout("kick_flushing_inode_caps %p flushing %s\n", inode,
2237 ceph_cap_string(ci->i_flushing_caps));
2238
2239 __ceph_flush_snaps(ci, &session, 1);
2240
2241 if (ci->i_flushing_caps) {
2242 int delayed;
2243
2244 spin_lock(&mdsc->cap_dirty_lock);
2245 list_move_tail(&ci->i_flushing_item,
2246 &cap->session->s_cap_flushing);
2247 spin_unlock(&mdsc->cap_dirty_lock);
2248
2249 spin_unlock(&ci->i_ceph_lock);
2250
2251 delayed = __kick_flushing_caps(mdsc, session, ci);
2252 if (delayed) {
2253 spin_lock(&ci->i_ceph_lock);
2254 __cap_delay_requeue(mdsc, ci);
2255 spin_unlock(&ci->i_ceph_lock);
2256 }
2257 } else {
2258 spin_unlock(&ci->i_ceph_lock);
2259 }
2260}
2261
2262
2263/*
2264 * Take references to capabilities we hold, so that we don't release
2265 * them to the MDS prematurely.
2266 *
2267 * Protected by i_ceph_lock.
2268 */
2269static void __take_cap_refs(struct ceph_inode_info *ci, int got,
2270 bool snap_rwsem_locked)
2271{
2272 if (got & CEPH_CAP_PIN)
2273 ci->i_pin_ref++;
2274 if (got & CEPH_CAP_FILE_RD)
2275 ci->i_rd_ref++;
2276 if (got & CEPH_CAP_FILE_CACHE)
2277 ci->i_rdcache_ref++;
2278 if (got & CEPH_CAP_FILE_WR) {
2279 if (ci->i_wr_ref == 0 && !ci->i_head_snapc) {
2280 BUG_ON(!snap_rwsem_locked);
2281 ci->i_head_snapc = ceph_get_snap_context(
2282 ci->i_snap_realm->cached_context);
2283 }
2284 ci->i_wr_ref++;
2285 }
2286 if (got & CEPH_CAP_FILE_BUFFER) {
2287 if (ci->i_wb_ref == 0)
2288 ihold(&ci->vfs_inode);
2289 ci->i_wb_ref++;
2290 dout("__take_cap_refs %p wb %d -> %d (?)\n",
2291 &ci->vfs_inode, ci->i_wb_ref-1, ci->i_wb_ref);
2292 }
2293}
2294
2295/*
2296 * Try to grab cap references. Specify those refs we @want, and the
2297 * minimal set we @need. Also include the larger offset we are writing
2298 * to (when applicable), and check against max_size here as well.
2299 * Note that caller is responsible for ensuring max_size increases are
2300 * requested from the MDS.
2301 */
2302static int try_get_cap_refs(struct ceph_inode_info *ci, int need, int want,
2303 loff_t endoff, bool nonblock, int *got, int *err)
2304{
2305 struct inode *inode = &ci->vfs_inode;
2306 struct ceph_mds_client *mdsc = ceph_inode_to_client(inode)->mdsc;
2307 int ret = 0;
2308 int have, implemented;
2309 int file_wanted;
2310 bool snap_rwsem_locked = false;
2311
2312 dout("get_cap_refs %p need %s want %s\n", inode,
2313 ceph_cap_string(need), ceph_cap_string(want));
2314
2315again:
2316 spin_lock(&ci->i_ceph_lock);
2317
2318 /* make sure file is actually open */
2319 file_wanted = __ceph_caps_file_wanted(ci);
2320 if ((file_wanted & need) == 0) {
2321 dout("try_get_cap_refs need %s file_wanted %s, EBADF\n",
2322 ceph_cap_string(need), ceph_cap_string(file_wanted));
2323 *err = -EBADF;
2324 ret = 1;
2325 goto out_unlock;
2326 }
2327
2328 /* finish pending truncate */
2329 while (ci->i_truncate_pending) {
2330 spin_unlock(&ci->i_ceph_lock);
2331 if (snap_rwsem_locked) {
2332 up_read(&mdsc->snap_rwsem);
2333 snap_rwsem_locked = false;
2334 }
2335 __ceph_do_pending_vmtruncate(inode);
2336 spin_lock(&ci->i_ceph_lock);
2337 }
2338
2339 have = __ceph_caps_issued(ci, &implemented);
2340
2341 if (have & need & CEPH_CAP_FILE_WR) {
2342 if (endoff >= 0 && endoff > (loff_t)ci->i_max_size) {
2343 dout("get_cap_refs %p endoff %llu > maxsize %llu\n",
2344 inode, endoff, ci->i_max_size);
2345 if (endoff > ci->i_requested_max_size) {
2346 *err = -EAGAIN;
2347 ret = 1;
2348 }
2349 goto out_unlock;
2350 }
2351 /*
2352 * If a sync write is in progress, we must wait, so that we
2353 * can get a final snapshot value for size+mtime.
2354 */
2355 if (__ceph_have_pending_cap_snap(ci)) {
2356 dout("get_cap_refs %p cap_snap_pending\n", inode);
2357 goto out_unlock;
2358 }
2359 }
2360
2361 if ((have & need) == need) {
2362 /*
2363 * Look at (implemented & ~have & not) so that we keep waiting
2364 * on transition from wanted -> needed caps. This is needed
2365 * for WRBUFFER|WR -> WR to avoid a new WR sync write from
2366 * going before a prior buffered writeback happens.
2367 */
2368 int not = want & ~(have & need);
2369 int revoking = implemented & ~have;
2370 dout("get_cap_refs %p have %s but not %s (revoking %s)\n",
2371 inode, ceph_cap_string(have), ceph_cap_string(not),
2372 ceph_cap_string(revoking));
2373 if ((revoking & not) == 0) {
2374 if (!snap_rwsem_locked &&
2375 !ci->i_head_snapc &&
2376 (need & CEPH_CAP_FILE_WR)) {
2377 if (!down_read_trylock(&mdsc->snap_rwsem)) {
2378 /*
2379 * we can not call down_read() when
2380 * task isn't in TASK_RUNNING state
2381 */
2382 if (nonblock) {
2383 *err = -EAGAIN;
2384 ret = 1;
2385 goto out_unlock;
2386 }
2387
2388 spin_unlock(&ci->i_ceph_lock);
2389 down_read(&mdsc->snap_rwsem);
2390 snap_rwsem_locked = true;
2391 goto again;
2392 }
2393 snap_rwsem_locked = true;
2394 }
2395 *got = need | (have & want);
2396 __take_cap_refs(ci, *got, true);
2397 ret = 1;
2398 }
2399 } else {
2400 int session_readonly = false;
2401 if ((need & CEPH_CAP_FILE_WR) && ci->i_auth_cap) {
2402 struct ceph_mds_session *s = ci->i_auth_cap->session;
2403 spin_lock(&s->s_cap_lock);
2404 session_readonly = s->s_readonly;
2405 spin_unlock(&s->s_cap_lock);
2406 }
2407 if (session_readonly) {
2408 dout("get_cap_refs %p needed %s but mds%d readonly\n",
2409 inode, ceph_cap_string(need), ci->i_auth_cap->mds);
2410 *err = -EROFS;
2411 ret = 1;
2412 goto out_unlock;
2413 }
2414
2415 if (!__ceph_is_any_caps(ci) &&
2416 ACCESS_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_SHUTDOWN) {
2417 dout("get_cap_refs %p forced umount\n", inode);
2418 *err = -EIO;
2419 ret = 1;
2420 goto out_unlock;
2421 }
2422
2423 dout("get_cap_refs %p have %s needed %s\n", inode,
2424 ceph_cap_string(have), ceph_cap_string(need));
2425 }
2426out_unlock:
2427 spin_unlock(&ci->i_ceph_lock);
2428 if (snap_rwsem_locked)
2429 up_read(&mdsc->snap_rwsem);
2430
2431 dout("get_cap_refs %p ret %d got %s\n", inode,
2432 ret, ceph_cap_string(*got));
2433 return ret;
2434}
2435
2436/*
2437 * Check the offset we are writing up to against our current
2438 * max_size. If necessary, tell the MDS we want to write to
2439 * a larger offset.
2440 */
2441static void check_max_size(struct inode *inode, loff_t endoff)
2442{
2443 struct ceph_inode_info *ci = ceph_inode(inode);
2444 int check = 0;
2445
2446 /* do we need to explicitly request a larger max_size? */
2447 spin_lock(&ci->i_ceph_lock);
2448 if (endoff >= ci->i_max_size && endoff > ci->i_wanted_max_size) {
2449 dout("write %p at large endoff %llu, req max_size\n",
2450 inode, endoff);
2451 ci->i_wanted_max_size = endoff;
2452 }
2453 /* duplicate ceph_check_caps()'s logic */
2454 if (ci->i_auth_cap &&
2455 (ci->i_auth_cap->issued & CEPH_CAP_FILE_WR) &&
2456 ci->i_wanted_max_size > ci->i_max_size &&
2457 ci->i_wanted_max_size > ci->i_requested_max_size)
2458 check = 1;
2459 spin_unlock(&ci->i_ceph_lock);
2460 if (check)
2461 ceph_check_caps(ci, CHECK_CAPS_AUTHONLY, NULL);
2462}
2463
2464/*
2465 * Wait for caps, and take cap references. If we can't get a WR cap
2466 * due to a small max_size, make sure we check_max_size (and possibly
2467 * ask the mds) so we don't get hung up indefinitely.
2468 */
2469int ceph_get_caps(struct ceph_inode_info *ci, int need, int want,
2470 loff_t endoff, int *got, struct page **pinned_page)
2471{
2472 int _got, ret, err = 0;
2473
2474 ret = ceph_pool_perm_check(ci, need);
2475 if (ret < 0)
2476 return ret;
2477
2478 while (true) {
2479 if (endoff > 0)
2480 check_max_size(&ci->vfs_inode, endoff);
2481
2482 err = 0;
2483 _got = 0;
2484 ret = try_get_cap_refs(ci, need, want, endoff,
2485 false, &_got, &err);
2486 if (ret) {
2487 if (err == -EAGAIN)
2488 continue;
2489 if (err < 0)
2490 return err;
2491 } else {
2492 ret = wait_event_interruptible(ci->i_cap_wq,
2493 try_get_cap_refs(ci, need, want, endoff,
2494 true, &_got, &err));
2495 if (err == -EAGAIN)
2496 continue;
2497 if (err < 0)
2498 ret = err;
2499 if (ret < 0)
2500 return ret;
2501 }
2502
2503 if (ci->i_inline_version != CEPH_INLINE_NONE &&
2504 (_got & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) &&
2505 i_size_read(&ci->vfs_inode) > 0) {
2506 struct page *page =
2507 find_get_page(ci->vfs_inode.i_mapping, 0);
2508 if (page) {
2509 if (PageUptodate(page)) {
2510 *pinned_page = page;
2511 break;
2512 }
2513 put_page(page);
2514 }
2515 /*
2516 * drop cap refs first because getattr while
2517 * holding * caps refs can cause deadlock.
2518 */
2519 ceph_put_cap_refs(ci, _got);
2520 _got = 0;
2521
2522 /*
2523 * getattr request will bring inline data into
2524 * page cache
2525 */
2526 ret = __ceph_do_getattr(&ci->vfs_inode, NULL,
2527 CEPH_STAT_CAP_INLINE_DATA,
2528 true);
2529 if (ret < 0)
2530 return ret;
2531 continue;
2532 }
2533 break;
2534 }
2535
2536 *got = _got;
2537 return 0;
2538}
2539
2540/*
2541 * Take cap refs. Caller must already know we hold at least one ref
2542 * on the caps in question or we don't know this is safe.
2543 */
2544void ceph_get_cap_refs(struct ceph_inode_info *ci, int caps)
2545{
2546 spin_lock(&ci->i_ceph_lock);
2547 __take_cap_refs(ci, caps, false);
2548 spin_unlock(&ci->i_ceph_lock);
2549}
2550
2551
2552/*
2553 * drop cap_snap that is not associated with any snapshot.
2554 * we don't need to send FLUSHSNAP message for it.
2555 */
2556static int ceph_try_drop_cap_snap(struct ceph_cap_snap *capsnap)
2557{
2558 if (!capsnap->need_flush &&
2559 !capsnap->writing && !capsnap->dirty_pages) {
2560
2561 dout("dropping cap_snap %p follows %llu\n",
2562 capsnap, capsnap->follows);
2563 ceph_put_snap_context(capsnap->context);
2564 list_del(&capsnap->ci_item);
2565 list_del(&capsnap->flushing_item);
2566 ceph_put_cap_snap(capsnap);
2567 return 1;
2568 }
2569 return 0;
2570}
2571
2572/*
2573 * Release cap refs.
2574 *
2575 * If we released the last ref on any given cap, call ceph_check_caps
2576 * to release (or schedule a release).
2577 *
2578 * If we are releasing a WR cap (from a sync write), finalize any affected
2579 * cap_snap, and wake up any waiters.
2580 */
2581void ceph_put_cap_refs(struct ceph_inode_info *ci, int had)
2582{
2583 struct inode *inode = &ci->vfs_inode;
2584 int last = 0, put = 0, flushsnaps = 0, wake = 0;
2585
2586 spin_lock(&ci->i_ceph_lock);
2587 if (had & CEPH_CAP_PIN)
2588 --ci->i_pin_ref;
2589 if (had & CEPH_CAP_FILE_RD)
2590 if (--ci->i_rd_ref == 0)
2591 last++;
2592 if (had & CEPH_CAP_FILE_CACHE)
2593 if (--ci->i_rdcache_ref == 0)
2594 last++;
2595 if (had & CEPH_CAP_FILE_BUFFER) {
2596 if (--ci->i_wb_ref == 0) {
2597 last++;
2598 put++;
2599 }
2600 dout("put_cap_refs %p wb %d -> %d (?)\n",
2601 inode, ci->i_wb_ref+1, ci->i_wb_ref);
2602 }
2603 if (had & CEPH_CAP_FILE_WR)
2604 if (--ci->i_wr_ref == 0) {
2605 last++;
2606 if (__ceph_have_pending_cap_snap(ci)) {
2607 struct ceph_cap_snap *capsnap =
2608 list_last_entry(&ci->i_cap_snaps,
2609 struct ceph_cap_snap,
2610 ci_item);
2611 capsnap->writing = 0;
2612 if (ceph_try_drop_cap_snap(capsnap))
2613 put++;
2614 else if (__ceph_finish_cap_snap(ci, capsnap))
2615 flushsnaps = 1;
2616 wake = 1;
2617 }
2618 if (ci->i_wrbuffer_ref_head == 0 &&
2619 ci->i_dirty_caps == 0 &&
2620 ci->i_flushing_caps == 0) {
2621 BUG_ON(!ci->i_head_snapc);
2622 ceph_put_snap_context(ci->i_head_snapc);
2623 ci->i_head_snapc = NULL;
2624 }
2625 /* see comment in __ceph_remove_cap() */
2626 if (!__ceph_is_any_caps(ci) && ci->i_snap_realm)
2627 drop_inode_snap_realm(ci);
2628 }
2629 spin_unlock(&ci->i_ceph_lock);
2630
2631 dout("put_cap_refs %p had %s%s%s\n", inode, ceph_cap_string(had),
2632 last ? " last" : "", put ? " put" : "");
2633
2634 if (last && !flushsnaps)
2635 ceph_check_caps(ci, 0, NULL);
2636 else if (flushsnaps)
2637 ceph_flush_snaps(ci);
2638 if (wake)
2639 wake_up_all(&ci->i_cap_wq);
2640 while (put-- > 0)
2641 iput(inode);
2642}
2643
2644/*
2645 * Release @nr WRBUFFER refs on dirty pages for the given @snapc snap
2646 * context. Adjust per-snap dirty page accounting as appropriate.
2647 * Once all dirty data for a cap_snap is flushed, flush snapped file
2648 * metadata back to the MDS. If we dropped the last ref, call
2649 * ceph_check_caps.
2650 */
2651void ceph_put_wrbuffer_cap_refs(struct ceph_inode_info *ci, int nr,
2652 struct ceph_snap_context *snapc)
2653{
2654 struct inode *inode = &ci->vfs_inode;
2655 int last = 0;
2656 int complete_capsnap = 0;
2657 int drop_capsnap = 0;
2658 int found = 0;
2659 struct ceph_cap_snap *capsnap = NULL;
2660
2661 spin_lock(&ci->i_ceph_lock);
2662 ci->i_wrbuffer_ref -= nr;
2663 last = !ci->i_wrbuffer_ref;
2664
2665 if (ci->i_head_snapc == snapc) {
2666 ci->i_wrbuffer_ref_head -= nr;
2667 if (ci->i_wrbuffer_ref_head == 0 &&
2668 ci->i_wr_ref == 0 &&
2669 ci->i_dirty_caps == 0 &&
2670 ci->i_flushing_caps == 0) {
2671 BUG_ON(!ci->i_head_snapc);
2672 ceph_put_snap_context(ci->i_head_snapc);
2673 ci->i_head_snapc = NULL;
2674 }
2675 dout("put_wrbuffer_cap_refs on %p head %d/%d -> %d/%d %s\n",
2676 inode,
2677 ci->i_wrbuffer_ref+nr, ci->i_wrbuffer_ref_head+nr,
2678 ci->i_wrbuffer_ref, ci->i_wrbuffer_ref_head,
2679 last ? " LAST" : "");
2680 } else {
2681 list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) {
2682 if (capsnap->context == snapc) {
2683 found = 1;
2684 break;
2685 }
2686 }
2687 BUG_ON(!found);
2688 capsnap->dirty_pages -= nr;
2689 if (capsnap->dirty_pages == 0) {
2690 complete_capsnap = 1;
2691 drop_capsnap = ceph_try_drop_cap_snap(capsnap);
2692 }
2693 dout("put_wrbuffer_cap_refs on %p cap_snap %p "
2694 " snap %lld %d/%d -> %d/%d %s%s\n",
2695 inode, capsnap, capsnap->context->seq,
2696 ci->i_wrbuffer_ref+nr, capsnap->dirty_pages + nr,
2697 ci->i_wrbuffer_ref, capsnap->dirty_pages,
2698 last ? " (wrbuffer last)" : "",
2699 complete_capsnap ? " (complete capsnap)" : "");
2700 }
2701
2702 spin_unlock(&ci->i_ceph_lock);
2703
2704 if (last) {
2705 ceph_check_caps(ci, CHECK_CAPS_AUTHONLY, NULL);
2706 iput(inode);
2707 } else if (complete_capsnap) {
2708 ceph_flush_snaps(ci);
2709 wake_up_all(&ci->i_cap_wq);
2710 }
2711 if (drop_capsnap)
2712 iput(inode);
2713}
2714
2715/*
2716 * Invalidate unlinked inode's aliases, so we can drop the inode ASAP.
2717 */
2718static void invalidate_aliases(struct inode *inode)
2719{
2720 struct dentry *dn, *prev = NULL;
2721
2722 dout("invalidate_aliases inode %p\n", inode);
2723 d_prune_aliases(inode);
2724 /*
2725 * For non-directory inode, d_find_alias() only returns
2726 * hashed dentry. After calling d_invalidate(), the
2727 * dentry becomes unhashed.
2728 *
2729 * For directory inode, d_find_alias() can return
2730 * unhashed dentry. But directory inode should have
2731 * one alias at most.
2732 */
2733 while ((dn = d_find_alias(inode))) {
2734 if (dn == prev) {
2735 dput(dn);
2736 break;
2737 }
2738 d_invalidate(dn);
2739 if (prev)
2740 dput(prev);
2741 prev = dn;
2742 }
2743 if (prev)
2744 dput(prev);
2745}
2746
2747/*
2748 * Handle a cap GRANT message from the MDS. (Note that a GRANT may
2749 * actually be a revocation if it specifies a smaller cap set.)
2750 *
2751 * caller holds s_mutex and i_ceph_lock, we drop both.
2752 */
2753static void handle_cap_grant(struct ceph_mds_client *mdsc,
2754 struct inode *inode, struct ceph_mds_caps *grant,
2755 u64 inline_version,
2756 void *inline_data, int inline_len,
2757 struct ceph_buffer *xattr_buf,
2758 struct ceph_mds_session *session,
2759 struct ceph_cap *cap, int issued,
2760 u32 pool_ns_len)
2761 __releases(ci->i_ceph_lock)
2762 __releases(mdsc->snap_rwsem)
2763{
2764 struct ceph_inode_info *ci = ceph_inode(inode);
2765 int mds = session->s_mds;
2766 int seq = le32_to_cpu(grant->seq);
2767 int newcaps = le32_to_cpu(grant->caps);
2768 int used, wanted, dirty;
2769 u64 size = le64_to_cpu(grant->size);
2770 u64 max_size = le64_to_cpu(grant->max_size);
2771 struct timespec mtime, atime, ctime;
2772 int check_caps = 0;
2773 bool wake = false;
2774 bool writeback = false;
2775 bool queue_trunc = false;
2776 bool queue_invalidate = false;
2777 bool queue_revalidate = false;
2778 bool deleted_inode = false;
2779 bool fill_inline = false;
2780
2781 dout("handle_cap_grant inode %p cap %p mds%d seq %d %s\n",
2782 inode, cap, mds, seq, ceph_cap_string(newcaps));
2783 dout(" size %llu max_size %llu, i_size %llu\n", size, max_size,
2784 inode->i_size);
2785
2786
2787 /*
2788 * auth mds of the inode changed. we received the cap export message,
2789 * but still haven't received the cap import message. handle_cap_export
2790 * updated the new auth MDS' cap.
2791 *
2792 * "ceph_seq_cmp(seq, cap->seq) <= 0" means we are processing a message
2793 * that was sent before the cap import message. So don't remove caps.
2794 */
2795 if (ceph_seq_cmp(seq, cap->seq) <= 0) {
2796 WARN_ON(cap != ci->i_auth_cap);
2797 WARN_ON(cap->cap_id != le64_to_cpu(grant->cap_id));
2798 seq = cap->seq;
2799 newcaps |= cap->issued;
2800 }
2801
2802 /*
2803 * If CACHE is being revoked, and we have no dirty buffers,
2804 * try to invalidate (once). (If there are dirty buffers, we
2805 * will invalidate _after_ writeback.)
2806 */
2807 if (!S_ISDIR(inode->i_mode) && /* don't invalidate readdir cache */
2808 ((cap->issued & ~newcaps) & CEPH_CAP_FILE_CACHE) &&
2809 (newcaps & CEPH_CAP_FILE_LAZYIO) == 0 &&
2810 !ci->i_wrbuffer_ref) {
2811 if (try_nonblocking_invalidate(inode)) {
2812 /* there were locked pages.. invalidate later
2813 in a separate thread. */
2814 if (ci->i_rdcache_revoking != ci->i_rdcache_gen) {
2815 queue_invalidate = true;
2816 ci->i_rdcache_revoking = ci->i_rdcache_gen;
2817 }
2818 }
2819
2820 ceph_fscache_invalidate(inode);
2821 }
2822
2823 /* side effects now are allowed */
2824 cap->cap_gen = session->s_cap_gen;
2825 cap->seq = seq;
2826
2827 __check_cap_issue(ci, cap, newcaps);
2828
2829 if ((newcaps & CEPH_CAP_AUTH_SHARED) &&
2830 (issued & CEPH_CAP_AUTH_EXCL) == 0) {
2831 inode->i_mode = le32_to_cpu(grant->mode);
2832 inode->i_uid = make_kuid(&init_user_ns, le32_to_cpu(grant->uid));
2833 inode->i_gid = make_kgid(&init_user_ns, le32_to_cpu(grant->gid));
2834 dout("%p mode 0%o uid.gid %d.%d\n", inode, inode->i_mode,
2835 from_kuid(&init_user_ns, inode->i_uid),
2836 from_kgid(&init_user_ns, inode->i_gid));
2837 }
2838
2839 if ((newcaps & CEPH_CAP_AUTH_SHARED) &&
2840 (issued & CEPH_CAP_LINK_EXCL) == 0) {
2841 set_nlink(inode, le32_to_cpu(grant->nlink));
2842 if (inode->i_nlink == 0 &&
2843 (newcaps & (CEPH_CAP_LINK_SHARED | CEPH_CAP_LINK_EXCL)))
2844 deleted_inode = true;
2845 }
2846
2847 if ((issued & CEPH_CAP_XATTR_EXCL) == 0 && grant->xattr_len) {
2848 int len = le32_to_cpu(grant->xattr_len);
2849 u64 version = le64_to_cpu(grant->xattr_version);
2850
2851 if (version > ci->i_xattrs.version) {
2852 dout(" got new xattrs v%llu on %p len %d\n",
2853 version, inode, len);
2854 if (ci->i_xattrs.blob)
2855 ceph_buffer_put(ci->i_xattrs.blob);
2856 ci->i_xattrs.blob = ceph_buffer_get(xattr_buf);
2857 ci->i_xattrs.version = version;
2858 ceph_forget_all_cached_acls(inode);
2859 }
2860 }
2861
2862 /* Do we need to revalidate our fscache cookie. Don't bother on the
2863 * first cache cap as we already validate at cookie creation time. */
2864 if ((issued & CEPH_CAP_FILE_CACHE) && ci->i_rdcache_gen > 1)
2865 queue_revalidate = true;
2866
2867 if (newcaps & CEPH_CAP_ANY_RD) {
2868 /* ctime/mtime/atime? */
2869 ceph_decode_timespec(&mtime, &grant->mtime);
2870 ceph_decode_timespec(&atime, &grant->atime);
2871 ceph_decode_timespec(&ctime, &grant->ctime);
2872 ceph_fill_file_time(inode, issued,
2873 le32_to_cpu(grant->time_warp_seq),
2874 &ctime, &mtime, &atime);
2875 }
2876
2877 if (newcaps & (CEPH_CAP_ANY_FILE_RD | CEPH_CAP_ANY_FILE_WR)) {
2878 /* file layout may have changed */
2879 ci->i_layout = grant->layout;
2880 ci->i_pool_ns_len = pool_ns_len;
2881
2882 /* size/truncate_seq? */
2883 queue_trunc = ceph_fill_file_size(inode, issued,
2884 le32_to_cpu(grant->truncate_seq),
2885 le64_to_cpu(grant->truncate_size),
2886 size);
2887 /* max size increase? */
2888 if (ci->i_auth_cap == cap && max_size != ci->i_max_size) {
2889 dout("max_size %lld -> %llu\n",
2890 ci->i_max_size, max_size);
2891 ci->i_max_size = max_size;
2892 if (max_size >= ci->i_wanted_max_size) {
2893 ci->i_wanted_max_size = 0; /* reset */
2894 ci->i_requested_max_size = 0;
2895 }
2896 wake = true;
2897 }
2898 }
2899
2900 /* check cap bits */
2901 wanted = __ceph_caps_wanted(ci);
2902 used = __ceph_caps_used(ci);
2903 dirty = __ceph_caps_dirty(ci);
2904 dout(" my wanted = %s, used = %s, dirty %s\n",
2905 ceph_cap_string(wanted),
2906 ceph_cap_string(used),
2907 ceph_cap_string(dirty));
2908 if (wanted != le32_to_cpu(grant->wanted)) {
2909 dout("mds wanted %s -> %s\n",
2910 ceph_cap_string(le32_to_cpu(grant->wanted)),
2911 ceph_cap_string(wanted));
2912 /* imported cap may not have correct mds_wanted */
2913 if (le32_to_cpu(grant->op) == CEPH_CAP_OP_IMPORT)
2914 check_caps = 1;
2915 }
2916
2917 /* revocation, grant, or no-op? */
2918 if (cap->issued & ~newcaps) {
2919 int revoking = cap->issued & ~newcaps;
2920
2921 dout("revocation: %s -> %s (revoking %s)\n",
2922 ceph_cap_string(cap->issued),
2923 ceph_cap_string(newcaps),
2924 ceph_cap_string(revoking));
2925 if (revoking & used & CEPH_CAP_FILE_BUFFER)
2926 writeback = true; /* initiate writeback; will delay ack */
2927 else if (revoking == CEPH_CAP_FILE_CACHE &&
2928 (newcaps & CEPH_CAP_FILE_LAZYIO) == 0 &&
2929 queue_invalidate)
2930 ; /* do nothing yet, invalidation will be queued */
2931 else if (cap == ci->i_auth_cap)
2932 check_caps = 1; /* check auth cap only */
2933 else
2934 check_caps = 2; /* check all caps */
2935 cap->issued = newcaps;
2936 cap->implemented |= newcaps;
2937 } else if (cap->issued == newcaps) {
2938 dout("caps unchanged: %s -> %s\n",
2939 ceph_cap_string(cap->issued), ceph_cap_string(newcaps));
2940 } else {
2941 dout("grant: %s -> %s\n", ceph_cap_string(cap->issued),
2942 ceph_cap_string(newcaps));
2943 /* non-auth MDS is revoking the newly grant caps ? */
2944 if (cap == ci->i_auth_cap &&
2945 __ceph_caps_revoking_other(ci, cap, newcaps))
2946 check_caps = 2;
2947
2948 cap->issued = newcaps;
2949 cap->implemented |= newcaps; /* add bits only, to
2950 * avoid stepping on a
2951 * pending revocation */
2952 wake = true;
2953 }
2954 BUG_ON(cap->issued & ~cap->implemented);
2955
2956 if (inline_version > 0 && inline_version >= ci->i_inline_version) {
2957 ci->i_inline_version = inline_version;
2958 if (ci->i_inline_version != CEPH_INLINE_NONE &&
2959 (newcaps & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)))
2960 fill_inline = true;
2961 }
2962
2963 spin_unlock(&ci->i_ceph_lock);
2964
2965 if (le32_to_cpu(grant->op) == CEPH_CAP_OP_IMPORT) {
2966 kick_flushing_inode_caps(mdsc, session, inode);
2967 up_read(&mdsc->snap_rwsem);
2968 if (newcaps & ~issued)
2969 wake = true;
2970 }
2971
2972 if (fill_inline)
2973 ceph_fill_inline_data(inode, NULL, inline_data, inline_len);
2974
2975 if (queue_trunc) {
2976 ceph_queue_vmtruncate(inode);
2977 ceph_queue_revalidate(inode);
2978 } else if (queue_revalidate)
2979 ceph_queue_revalidate(inode);
2980
2981 if (writeback)
2982 /*
2983 * queue inode for writeback: we can't actually call
2984 * filemap_write_and_wait, etc. from message handler
2985 * context.
2986 */
2987 ceph_queue_writeback(inode);
2988 if (queue_invalidate)
2989 ceph_queue_invalidate(inode);
2990 if (deleted_inode)
2991 invalidate_aliases(inode);
2992 if (wake)
2993 wake_up_all(&ci->i_cap_wq);
2994
2995 if (check_caps == 1)
2996 ceph_check_caps(ci, CHECK_CAPS_NODELAY|CHECK_CAPS_AUTHONLY,
2997 session);
2998 else if (check_caps == 2)
2999 ceph_check_caps(ci, CHECK_CAPS_NODELAY, session);
3000 else
3001 mutex_unlock(&session->s_mutex);
3002}
3003
3004/*
3005 * Handle FLUSH_ACK from MDS, indicating that metadata we sent to the
3006 * MDS has been safely committed.
3007 */
3008static void handle_cap_flush_ack(struct inode *inode, u64 flush_tid,
3009 struct ceph_mds_caps *m,
3010 struct ceph_mds_session *session,
3011 struct ceph_cap *cap)
3012 __releases(ci->i_ceph_lock)
3013{
3014 struct ceph_inode_info *ci = ceph_inode(inode);
3015 struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
3016 struct ceph_cap_flush *cf;
3017 struct rb_node *n;
3018 LIST_HEAD(to_remove);
3019 unsigned seq = le32_to_cpu(m->seq);
3020 int dirty = le32_to_cpu(m->dirty);
3021 int cleaned = 0;
3022 int drop = 0;
3023
3024 n = rb_first(&ci->i_cap_flush_tree);
3025 while (n) {
3026 cf = rb_entry(n, struct ceph_cap_flush, i_node);
3027 n = rb_next(&cf->i_node);
3028 if (cf->tid == flush_tid)
3029 cleaned = cf->caps;
3030 if (cf->tid <= flush_tid) {
3031 rb_erase(&cf->i_node, &ci->i_cap_flush_tree);
3032 list_add_tail(&cf->list, &to_remove);
3033 } else {
3034 cleaned &= ~cf->caps;
3035 if (!cleaned)
3036 break;
3037 }
3038 }
3039
3040 dout("handle_cap_flush_ack inode %p mds%d seq %d on %s cleaned %s,"
3041 " flushing %s -> %s\n",
3042 inode, session->s_mds, seq, ceph_cap_string(dirty),
3043 ceph_cap_string(cleaned), ceph_cap_string(ci->i_flushing_caps),
3044 ceph_cap_string(ci->i_flushing_caps & ~cleaned));
3045
3046 if (list_empty(&to_remove) && !cleaned)
3047 goto out;
3048
3049 ci->i_flushing_caps &= ~cleaned;
3050
3051 spin_lock(&mdsc->cap_dirty_lock);
3052
3053 if (!list_empty(&to_remove)) {
3054 list_for_each_entry(cf, &to_remove, list)
3055 rb_erase(&cf->g_node, &mdsc->cap_flush_tree);
3056
3057 n = rb_first(&mdsc->cap_flush_tree);
3058 cf = n ? rb_entry(n, struct ceph_cap_flush, g_node) : NULL;
3059 if (!cf || cf->tid > flush_tid)
3060 wake_up_all(&mdsc->cap_flushing_wq);
3061 }
3062
3063 if (ci->i_flushing_caps == 0) {
3064 list_del_init(&ci->i_flushing_item);
3065 if (!list_empty(&session->s_cap_flushing))
3066 dout(" mds%d still flushing cap on %p\n",
3067 session->s_mds,
3068 &list_entry(session->s_cap_flushing.next,
3069 struct ceph_inode_info,
3070 i_flushing_item)->vfs_inode);
3071 mdsc->num_cap_flushing--;
3072 dout(" inode %p now !flushing\n", inode);
3073
3074 if (ci->i_dirty_caps == 0) {
3075 dout(" inode %p now clean\n", inode);
3076 BUG_ON(!list_empty(&ci->i_dirty_item));
3077 drop = 1;
3078 if (ci->i_wr_ref == 0 &&
3079 ci->i_wrbuffer_ref_head == 0) {
3080 BUG_ON(!ci->i_head_snapc);
3081 ceph_put_snap_context(ci->i_head_snapc);
3082 ci->i_head_snapc = NULL;
3083 }
3084 } else {
3085 BUG_ON(list_empty(&ci->i_dirty_item));
3086 }
3087 }
3088 spin_unlock(&mdsc->cap_dirty_lock);
3089 wake_up_all(&ci->i_cap_wq);
3090
3091out:
3092 spin_unlock(&ci->i_ceph_lock);
3093
3094 while (!list_empty(&to_remove)) {
3095 cf = list_first_entry(&to_remove,
3096 struct ceph_cap_flush, list);
3097 list_del(&cf->list);
3098 ceph_free_cap_flush(cf);
3099 }
3100 if (drop)
3101 iput(inode);
3102}
3103
3104/*
3105 * Handle FLUSHSNAP_ACK. MDS has flushed snap data to disk and we can
3106 * throw away our cap_snap.
3107 *
3108 * Caller hold s_mutex.
3109 */
3110static void handle_cap_flushsnap_ack(struct inode *inode, u64 flush_tid,
3111 struct ceph_mds_caps *m,
3112 struct ceph_mds_session *session)
3113{
3114 struct ceph_inode_info *ci = ceph_inode(inode);
3115 struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
3116 u64 follows = le64_to_cpu(m->snap_follows);
3117 struct ceph_cap_snap *capsnap;
3118 int drop = 0;
3119
3120 dout("handle_cap_flushsnap_ack inode %p ci %p mds%d follows %lld\n",
3121 inode, ci, session->s_mds, follows);
3122
3123 spin_lock(&ci->i_ceph_lock);
3124 list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) {
3125 if (capsnap->follows == follows) {
3126 if (capsnap->flush_tid != flush_tid) {
3127 dout(" cap_snap %p follows %lld tid %lld !="
3128 " %lld\n", capsnap, follows,
3129 flush_tid, capsnap->flush_tid);
3130 break;
3131 }
3132 WARN_ON(capsnap->dirty_pages || capsnap->writing);
3133 dout(" removing %p cap_snap %p follows %lld\n",
3134 inode, capsnap, follows);
3135 ceph_put_snap_context(capsnap->context);
3136 list_del(&capsnap->ci_item);
3137 list_del(&capsnap->flushing_item);
3138 ceph_put_cap_snap(capsnap);
3139 wake_up_all(&mdsc->cap_flushing_wq);
3140 drop = 1;
3141 break;
3142 } else {
3143 dout(" skipping cap_snap %p follows %lld\n",
3144 capsnap, capsnap->follows);
3145 }
3146 }
3147 spin_unlock(&ci->i_ceph_lock);
3148 if (drop)
3149 iput(inode);
3150}
3151
3152/*
3153 * Handle TRUNC from MDS, indicating file truncation.
3154 *
3155 * caller hold s_mutex.
3156 */
3157static void handle_cap_trunc(struct inode *inode,
3158 struct ceph_mds_caps *trunc,
3159 struct ceph_mds_session *session)
3160 __releases(ci->i_ceph_lock)
3161{
3162 struct ceph_inode_info *ci = ceph_inode(inode);
3163 int mds = session->s_mds;
3164 int seq = le32_to_cpu(trunc->seq);
3165 u32 truncate_seq = le32_to_cpu(trunc->truncate_seq);
3166 u64 truncate_size = le64_to_cpu(trunc->truncate_size);
3167 u64 size = le64_to_cpu(trunc->size);
3168 int implemented = 0;
3169 int dirty = __ceph_caps_dirty(ci);
3170 int issued = __ceph_caps_issued(ceph_inode(inode), &implemented);
3171 int queue_trunc = 0;
3172
3173 issued |= implemented | dirty;
3174
3175 dout("handle_cap_trunc inode %p mds%d seq %d to %lld seq %d\n",
3176 inode, mds, seq, truncate_size, truncate_seq);
3177 queue_trunc = ceph_fill_file_size(inode, issued,
3178 truncate_seq, truncate_size, size);
3179 spin_unlock(&ci->i_ceph_lock);
3180
3181 if (queue_trunc) {
3182 ceph_queue_vmtruncate(inode);
3183 ceph_fscache_invalidate(inode);
3184 }
3185}
3186
3187/*
3188 * Handle EXPORT from MDS. Cap is being migrated _from_ this mds to a
3189 * different one. If we are the most recent migration we've seen (as
3190 * indicated by mseq), make note of the migrating cap bits for the
3191 * duration (until we see the corresponding IMPORT).
3192 *
3193 * caller holds s_mutex
3194 */
3195static void handle_cap_export(struct inode *inode, struct ceph_mds_caps *ex,
3196 struct ceph_mds_cap_peer *ph,
3197 struct ceph_mds_session *session)
3198{
3199 struct ceph_mds_client *mdsc = ceph_inode_to_client(inode)->mdsc;
3200 struct ceph_mds_session *tsession = NULL;
3201 struct ceph_cap *cap, *tcap, *new_cap = NULL;
3202 struct ceph_inode_info *ci = ceph_inode(inode);
3203 u64 t_cap_id;
3204 unsigned mseq = le32_to_cpu(ex->migrate_seq);
3205 unsigned t_seq, t_mseq;
3206 int target, issued;
3207 int mds = session->s_mds;
3208
3209 if (ph) {
3210 t_cap_id = le64_to_cpu(ph->cap_id);
3211 t_seq = le32_to_cpu(ph->seq);
3212 t_mseq = le32_to_cpu(ph->mseq);
3213 target = le32_to_cpu(ph->mds);
3214 } else {
3215 t_cap_id = t_seq = t_mseq = 0;
3216 target = -1;
3217 }
3218
3219 dout("handle_cap_export inode %p ci %p mds%d mseq %d target %d\n",
3220 inode, ci, mds, mseq, target);
3221retry:
3222 spin_lock(&ci->i_ceph_lock);
3223 cap = __get_cap_for_mds(ci, mds);
3224 if (!cap || cap->cap_id != le64_to_cpu(ex->cap_id))
3225 goto out_unlock;
3226
3227 if (target < 0) {
3228 __ceph_remove_cap(cap, false);
3229 goto out_unlock;
3230 }
3231
3232 /*
3233 * now we know we haven't received the cap import message yet
3234 * because the exported cap still exist.
3235 */
3236
3237 issued = cap->issued;
3238 WARN_ON(issued != cap->implemented);
3239
3240 tcap = __get_cap_for_mds(ci, target);
3241 if (tcap) {
3242 /* already have caps from the target */
3243 if (tcap->cap_id != t_cap_id ||
3244 ceph_seq_cmp(tcap->seq, t_seq) < 0) {
3245 dout(" updating import cap %p mds%d\n", tcap, target);
3246 tcap->cap_id = t_cap_id;
3247 tcap->seq = t_seq - 1;
3248 tcap->issue_seq = t_seq - 1;
3249 tcap->mseq = t_mseq;
3250 tcap->issued |= issued;
3251 tcap->implemented |= issued;
3252 if (cap == ci->i_auth_cap)
3253 ci->i_auth_cap = tcap;
3254 if (ci->i_flushing_caps && ci->i_auth_cap == tcap) {
3255 spin_lock(&mdsc->cap_dirty_lock);
3256 list_move_tail(&ci->i_flushing_item,
3257 &tcap->session->s_cap_flushing);
3258 spin_unlock(&mdsc->cap_dirty_lock);
3259 }
3260 }
3261 __ceph_remove_cap(cap, false);
3262 goto out_unlock;
3263 } else if (tsession) {
3264 /* add placeholder for the export tagert */
3265 int flag = (cap == ci->i_auth_cap) ? CEPH_CAP_FLAG_AUTH : 0;
3266 ceph_add_cap(inode, tsession, t_cap_id, -1, issued, 0,
3267 t_seq - 1, t_mseq, (u64)-1, flag, &new_cap);
3268
3269 __ceph_remove_cap(cap, false);
3270 goto out_unlock;
3271 }
3272
3273 spin_unlock(&ci->i_ceph_lock);
3274 mutex_unlock(&session->s_mutex);
3275
3276 /* open target session */
3277 tsession = ceph_mdsc_open_export_target_session(mdsc, target);
3278 if (!IS_ERR(tsession)) {
3279 if (mds > target) {
3280 mutex_lock(&session->s_mutex);
3281 mutex_lock_nested(&tsession->s_mutex,
3282 SINGLE_DEPTH_NESTING);
3283 } else {
3284 mutex_lock(&tsession->s_mutex);
3285 mutex_lock_nested(&session->s_mutex,
3286 SINGLE_DEPTH_NESTING);
3287 }
3288 new_cap = ceph_get_cap(mdsc, NULL);
3289 } else {
3290 WARN_ON(1);
3291 tsession = NULL;
3292 target = -1;
3293 }
3294 goto retry;
3295
3296out_unlock:
3297 spin_unlock(&ci->i_ceph_lock);
3298 mutex_unlock(&session->s_mutex);
3299 if (tsession) {
3300 mutex_unlock(&tsession->s_mutex);
3301 ceph_put_mds_session(tsession);
3302 }
3303 if (new_cap)
3304 ceph_put_cap(mdsc, new_cap);
3305}
3306
3307/*
3308 * Handle cap IMPORT.
3309 *
3310 * caller holds s_mutex. acquires i_ceph_lock
3311 */
3312static void handle_cap_import(struct ceph_mds_client *mdsc,
3313 struct inode *inode, struct ceph_mds_caps *im,
3314 struct ceph_mds_cap_peer *ph,
3315 struct ceph_mds_session *session,
3316 struct ceph_cap **target_cap, int *old_issued)
3317 __acquires(ci->i_ceph_lock)
3318{
3319 struct ceph_inode_info *ci = ceph_inode(inode);
3320 struct ceph_cap *cap, *ocap, *new_cap = NULL;
3321 int mds = session->s_mds;
3322 int issued;
3323 unsigned caps = le32_to_cpu(im->caps);
3324 unsigned wanted = le32_to_cpu(im->wanted);
3325 unsigned seq = le32_to_cpu(im->seq);
3326 unsigned mseq = le32_to_cpu(im->migrate_seq);
3327 u64 realmino = le64_to_cpu(im->realm);
3328 u64 cap_id = le64_to_cpu(im->cap_id);
3329 u64 p_cap_id;
3330 int peer;
3331
3332 if (ph) {
3333 p_cap_id = le64_to_cpu(ph->cap_id);
3334 peer = le32_to_cpu(ph->mds);
3335 } else {
3336 p_cap_id = 0;
3337 peer = -1;
3338 }
3339
3340 dout("handle_cap_import inode %p ci %p mds%d mseq %d peer %d\n",
3341 inode, ci, mds, mseq, peer);
3342
3343retry:
3344 spin_lock(&ci->i_ceph_lock);
3345 cap = __get_cap_for_mds(ci, mds);
3346 if (!cap) {
3347 if (!new_cap) {
3348 spin_unlock(&ci->i_ceph_lock);
3349 new_cap = ceph_get_cap(mdsc, NULL);
3350 goto retry;
3351 }
3352 cap = new_cap;
3353 } else {
3354 if (new_cap) {
3355 ceph_put_cap(mdsc, new_cap);
3356 new_cap = NULL;
3357 }
3358 }
3359
3360 __ceph_caps_issued(ci, &issued);
3361 issued |= __ceph_caps_dirty(ci);
3362
3363 ceph_add_cap(inode, session, cap_id, -1, caps, wanted, seq, mseq,
3364 realmino, CEPH_CAP_FLAG_AUTH, &new_cap);
3365
3366 ocap = peer >= 0 ? __get_cap_for_mds(ci, peer) : NULL;
3367 if (ocap && ocap->cap_id == p_cap_id) {
3368 dout(" remove export cap %p mds%d flags %d\n",
3369 ocap, peer, ph->flags);
3370 if ((ph->flags & CEPH_CAP_FLAG_AUTH) &&
3371 (ocap->seq != le32_to_cpu(ph->seq) ||
3372 ocap->mseq != le32_to_cpu(ph->mseq))) {
3373 pr_err("handle_cap_import: mismatched seq/mseq: "
3374 "ino (%llx.%llx) mds%d seq %d mseq %d "
3375 "importer mds%d has peer seq %d mseq %d\n",
3376 ceph_vinop(inode), peer, ocap->seq,
3377 ocap->mseq, mds, le32_to_cpu(ph->seq),
3378 le32_to_cpu(ph->mseq));
3379 }
3380 __ceph_remove_cap(ocap, (ph->flags & CEPH_CAP_FLAG_RELEASE));
3381 }
3382
3383 /* make sure we re-request max_size, if necessary */
3384 ci->i_wanted_max_size = 0;
3385 ci->i_requested_max_size = 0;
3386
3387 *old_issued = issued;
3388 *target_cap = cap;
3389}
3390
3391/*
3392 * Handle a caps message from the MDS.
3393 *
3394 * Identify the appropriate session, inode, and call the right handler
3395 * based on the cap op.
3396 */
3397void ceph_handle_caps(struct ceph_mds_session *session,
3398 struct ceph_msg *msg)
3399{
3400 struct ceph_mds_client *mdsc = session->s_mdsc;
3401 struct super_block *sb = mdsc->fsc->sb;
3402 struct inode *inode;
3403 struct ceph_inode_info *ci;
3404 struct ceph_cap *cap;
3405 struct ceph_mds_caps *h;
3406 struct ceph_mds_cap_peer *peer = NULL;
3407 struct ceph_snap_realm *realm;
3408 int mds = session->s_mds;
3409 int op, issued;
3410 u32 seq, mseq;
3411 struct ceph_vino vino;
3412 u64 cap_id;
3413 u64 size, max_size;
3414 u64 tid;
3415 u64 inline_version = 0;
3416 void *inline_data = NULL;
3417 u32 inline_len = 0;
3418 void *snaptrace;
3419 size_t snaptrace_len;
3420 u32 pool_ns_len = 0;
3421 void *p, *end;
3422
3423 dout("handle_caps from mds%d\n", mds);
3424
3425 /* decode */
3426 end = msg->front.iov_base + msg->front.iov_len;
3427 tid = le64_to_cpu(msg->hdr.tid);
3428 if (msg->front.iov_len < sizeof(*h))
3429 goto bad;
3430 h = msg->front.iov_base;
3431 op = le32_to_cpu(h->op);
3432 vino.ino = le64_to_cpu(h->ino);
3433 vino.snap = CEPH_NOSNAP;
3434 cap_id = le64_to_cpu(h->cap_id);
3435 seq = le32_to_cpu(h->seq);
3436 mseq = le32_to_cpu(h->migrate_seq);
3437 size = le64_to_cpu(h->size);
3438 max_size = le64_to_cpu(h->max_size);
3439
3440 snaptrace = h + 1;
3441 snaptrace_len = le32_to_cpu(h->snap_trace_len);
3442 p = snaptrace + snaptrace_len;
3443
3444 if (le16_to_cpu(msg->hdr.version) >= 2) {
3445 u32 flock_len;
3446 ceph_decode_32_safe(&p, end, flock_len, bad);
3447 if (p + flock_len > end)
3448 goto bad;
3449 p += flock_len;
3450 }
3451
3452 if (le16_to_cpu(msg->hdr.version) >= 3) {
3453 if (op == CEPH_CAP_OP_IMPORT) {
3454 if (p + sizeof(*peer) > end)
3455 goto bad;
3456 peer = p;
3457 p += sizeof(*peer);
3458 } else if (op == CEPH_CAP_OP_EXPORT) {
3459 /* recorded in unused fields */
3460 peer = (void *)&h->size;
3461 }
3462 }
3463
3464 if (le16_to_cpu(msg->hdr.version) >= 4) {
3465 ceph_decode_64_safe(&p, end, inline_version, bad);
3466 ceph_decode_32_safe(&p, end, inline_len, bad);
3467 if (p + inline_len > end)
3468 goto bad;
3469 inline_data = p;
3470 p += inline_len;
3471 }
3472
3473 if (le16_to_cpu(msg->hdr.version) >= 8) {
3474 u64 flush_tid;
3475 u32 caller_uid, caller_gid;
3476 u32 osd_epoch_barrier;
3477 /* version >= 5 */
3478 ceph_decode_32_safe(&p, end, osd_epoch_barrier, bad);
3479 /* version >= 6 */
3480 ceph_decode_64_safe(&p, end, flush_tid, bad);
3481 /* version >= 7 */
3482 ceph_decode_32_safe(&p, end, caller_uid, bad);
3483 ceph_decode_32_safe(&p, end, caller_gid, bad);
3484 /* version >= 8 */
3485 ceph_decode_32_safe(&p, end, pool_ns_len, bad);
3486 }
3487
3488 /* lookup ino */
3489 inode = ceph_find_inode(sb, vino);
3490 ci = ceph_inode(inode);
3491 dout(" op %s ino %llx.%llx inode %p\n", ceph_cap_op_name(op), vino.ino,
3492 vino.snap, inode);
3493
3494 mutex_lock(&session->s_mutex);
3495 session->s_seq++;
3496 dout(" mds%d seq %lld cap seq %u\n", session->s_mds, session->s_seq,
3497 (unsigned)seq);
3498
3499 if (!inode) {
3500 dout(" i don't have ino %llx\n", vino.ino);
3501
3502 if (op == CEPH_CAP_OP_IMPORT) {
3503 cap = ceph_get_cap(mdsc, NULL);
3504 cap->cap_ino = vino.ino;
3505 cap->queue_release = 1;
3506 cap->cap_id = cap_id;
3507 cap->mseq = mseq;
3508 cap->seq = seq;
3509 spin_lock(&session->s_cap_lock);
3510 list_add_tail(&cap->session_caps,
3511 &session->s_cap_releases);
3512 session->s_num_cap_releases++;
3513 spin_unlock(&session->s_cap_lock);
3514 }
3515 goto flush_cap_releases;
3516 }
3517
3518 /* these will work even if we don't have a cap yet */
3519 switch (op) {
3520 case CEPH_CAP_OP_FLUSHSNAP_ACK:
3521 handle_cap_flushsnap_ack(inode, tid, h, session);
3522 goto done;
3523
3524 case CEPH_CAP_OP_EXPORT:
3525 handle_cap_export(inode, h, peer, session);
3526 goto done_unlocked;
3527
3528 case CEPH_CAP_OP_IMPORT:
3529 realm = NULL;
3530 if (snaptrace_len) {
3531 down_write(&mdsc->snap_rwsem);
3532 ceph_update_snap_trace(mdsc, snaptrace,
3533 snaptrace + snaptrace_len,
3534 false, &realm);
3535 downgrade_write(&mdsc->snap_rwsem);
3536 } else {
3537 down_read(&mdsc->snap_rwsem);
3538 }
3539 handle_cap_import(mdsc, inode, h, peer, session,
3540 &cap, &issued);
3541 handle_cap_grant(mdsc, inode, h,
3542 inline_version, inline_data, inline_len,
3543 msg->middle, session, cap, issued,
3544 pool_ns_len);
3545 if (realm)
3546 ceph_put_snap_realm(mdsc, realm);
3547 goto done_unlocked;
3548 }
3549
3550 /* the rest require a cap */
3551 spin_lock(&ci->i_ceph_lock);
3552 cap = __get_cap_for_mds(ceph_inode(inode), mds);
3553 if (!cap) {
3554 dout(" no cap on %p ino %llx.%llx from mds%d\n",
3555 inode, ceph_ino(inode), ceph_snap(inode), mds);
3556 spin_unlock(&ci->i_ceph_lock);
3557 goto flush_cap_releases;
3558 }
3559
3560 /* note that each of these drops i_ceph_lock for us */
3561 switch (op) {
3562 case CEPH_CAP_OP_REVOKE:
3563 case CEPH_CAP_OP_GRANT:
3564 __ceph_caps_issued(ci, &issued);
3565 issued |= __ceph_caps_dirty(ci);
3566 handle_cap_grant(mdsc, inode, h,
3567 inline_version, inline_data, inline_len,
3568 msg->middle, session, cap, issued,
3569 pool_ns_len);
3570 goto done_unlocked;
3571
3572 case CEPH_CAP_OP_FLUSH_ACK:
3573 handle_cap_flush_ack(inode, tid, h, session, cap);
3574 break;
3575
3576 case CEPH_CAP_OP_TRUNC:
3577 handle_cap_trunc(inode, h, session);
3578 break;
3579
3580 default:
3581 spin_unlock(&ci->i_ceph_lock);
3582 pr_err("ceph_handle_caps: unknown cap op %d %s\n", op,
3583 ceph_cap_op_name(op));
3584 }
3585
3586 goto done;
3587
3588flush_cap_releases:
3589 /*
3590 * send any cap release message to try to move things
3591 * along for the mds (who clearly thinks we still have this
3592 * cap).
3593 */
3594 ceph_send_cap_releases(mdsc, session);
3595
3596done:
3597 mutex_unlock(&session->s_mutex);
3598done_unlocked:
3599 iput(inode);
3600 return;
3601
3602bad:
3603 pr_err("ceph_handle_caps: corrupt message\n");
3604 ceph_msg_dump(msg);
3605 return;
3606}
3607
3608/*
3609 * Delayed work handler to process end of delayed cap release LRU list.
3610 */
3611void ceph_check_delayed_caps(struct ceph_mds_client *mdsc)
3612{
3613 struct ceph_inode_info *ci;
3614 int flags = CHECK_CAPS_NODELAY;
3615
3616 dout("check_delayed_caps\n");
3617 while (1) {
3618 spin_lock(&mdsc->cap_delay_lock);
3619 if (list_empty(&mdsc->cap_delay_list))
3620 break;
3621 ci = list_first_entry(&mdsc->cap_delay_list,
3622 struct ceph_inode_info,
3623 i_cap_delay_list);
3624 if ((ci->i_ceph_flags & CEPH_I_FLUSH) == 0 &&
3625 time_before(jiffies, ci->i_hold_caps_max))
3626 break;
3627 list_del_init(&ci->i_cap_delay_list);
3628 spin_unlock(&mdsc->cap_delay_lock);
3629 dout("check_delayed_caps on %p\n", &ci->vfs_inode);
3630 ceph_check_caps(ci, flags, NULL);
3631 }
3632 spin_unlock(&mdsc->cap_delay_lock);
3633}
3634
3635/*
3636 * Flush all dirty caps to the mds
3637 */
3638void ceph_flush_dirty_caps(struct ceph_mds_client *mdsc)
3639{
3640 struct ceph_inode_info *ci;
3641 struct inode *inode;
3642
3643 dout("flush_dirty_caps\n");
3644 spin_lock(&mdsc->cap_dirty_lock);
3645 while (!list_empty(&mdsc->cap_dirty)) {
3646 ci = list_first_entry(&mdsc->cap_dirty, struct ceph_inode_info,
3647 i_dirty_item);
3648 inode = &ci->vfs_inode;
3649 ihold(inode);
3650 dout("flush_dirty_caps %p\n", inode);
3651 spin_unlock(&mdsc->cap_dirty_lock);
3652 ceph_check_caps(ci, CHECK_CAPS_NODELAY|CHECK_CAPS_FLUSH, NULL);
3653 iput(inode);
3654 spin_lock(&mdsc->cap_dirty_lock);
3655 }
3656 spin_unlock(&mdsc->cap_dirty_lock);
3657 dout("flush_dirty_caps done\n");
3658}
3659
3660/*
3661 * Drop open file reference. If we were the last open file,
3662 * we may need to release capabilities to the MDS (or schedule
3663 * their delayed release).
3664 */
3665void ceph_put_fmode(struct ceph_inode_info *ci, int fmode)
3666{
3667 struct inode *inode = &ci->vfs_inode;
3668 int last = 0;
3669
3670 spin_lock(&ci->i_ceph_lock);
3671 dout("put_fmode %p fmode %d %d -> %d\n", inode, fmode,
3672 ci->i_nr_by_mode[fmode], ci->i_nr_by_mode[fmode]-1);
3673 BUG_ON(ci->i_nr_by_mode[fmode] == 0);
3674 if (--ci->i_nr_by_mode[fmode] == 0)
3675 last++;
3676 spin_unlock(&ci->i_ceph_lock);
3677
3678 if (last && ci->i_vino.snap == CEPH_NOSNAP)
3679 ceph_check_caps(ci, 0, NULL);
3680}
3681
3682/*
3683 * Helpers for embedding cap and dentry lease releases into mds
3684 * requests.
3685 *
3686 * @force is used by dentry_release (below) to force inclusion of a
3687 * record for the directory inode, even when there aren't any caps to
3688 * drop.
3689 */
3690int ceph_encode_inode_release(void **p, struct inode *inode,
3691 int mds, int drop, int unless, int force)
3692{
3693 struct ceph_inode_info *ci = ceph_inode(inode);
3694 struct ceph_cap *cap;
3695 struct ceph_mds_request_release *rel = *p;
3696 int used, dirty;
3697 int ret = 0;
3698
3699 spin_lock(&ci->i_ceph_lock);
3700 used = __ceph_caps_used(ci);
3701 dirty = __ceph_caps_dirty(ci);
3702
3703 dout("encode_inode_release %p mds%d used|dirty %s drop %s unless %s\n",
3704 inode, mds, ceph_cap_string(used|dirty), ceph_cap_string(drop),
3705 ceph_cap_string(unless));
3706
3707 /* only drop unused, clean caps */
3708 drop &= ~(used | dirty);
3709
3710 cap = __get_cap_for_mds(ci, mds);
3711 if (cap && __cap_is_valid(cap)) {
3712 if (force ||
3713 ((cap->issued & drop) &&
3714 (cap->issued & unless) == 0)) {
3715 if ((cap->issued & drop) &&
3716 (cap->issued & unless) == 0) {
3717 int wanted = __ceph_caps_wanted(ci);
3718 if ((ci->i_ceph_flags & CEPH_I_NODELAY) == 0)
3719 wanted |= cap->mds_wanted;
3720 dout("encode_inode_release %p cap %p "
3721 "%s -> %s, wanted %s -> %s\n", inode, cap,
3722 ceph_cap_string(cap->issued),
3723 ceph_cap_string(cap->issued & ~drop),
3724 ceph_cap_string(cap->mds_wanted),
3725 ceph_cap_string(wanted));
3726
3727 cap->issued &= ~drop;
3728 cap->implemented &= ~drop;
3729 cap->mds_wanted = wanted;
3730 } else {
3731 dout("encode_inode_release %p cap %p %s"
3732 " (force)\n", inode, cap,
3733 ceph_cap_string(cap->issued));
3734 }
3735
3736 rel->ino = cpu_to_le64(ceph_ino(inode));
3737 rel->cap_id = cpu_to_le64(cap->cap_id);
3738 rel->seq = cpu_to_le32(cap->seq);
3739 rel->issue_seq = cpu_to_le32(cap->issue_seq);
3740 rel->mseq = cpu_to_le32(cap->mseq);
3741 rel->caps = cpu_to_le32(cap->implemented);
3742 rel->wanted = cpu_to_le32(cap->mds_wanted);
3743 rel->dname_len = 0;
3744 rel->dname_seq = 0;
3745 *p += sizeof(*rel);
3746 ret = 1;
3747 } else {
3748 dout("encode_inode_release %p cap %p %s\n",
3749 inode, cap, ceph_cap_string(cap->issued));
3750 }
3751 }
3752 spin_unlock(&ci->i_ceph_lock);
3753 return ret;
3754}
3755
3756int ceph_encode_dentry_release(void **p, struct dentry *dentry,
3757 int mds, int drop, int unless)
3758{
3759 struct inode *dir = d_inode(dentry->d_parent);
3760 struct ceph_mds_request_release *rel = *p;
3761 struct ceph_dentry_info *di = ceph_dentry(dentry);
3762 int force = 0;
3763 int ret;
3764
3765 /*
3766 * force an record for the directory caps if we have a dentry lease.
3767 * this is racy (can't take i_ceph_lock and d_lock together), but it
3768 * doesn't have to be perfect; the mds will revoke anything we don't
3769 * release.
3770 */
3771 spin_lock(&dentry->d_lock);
3772 if (di->lease_session && di->lease_session->s_mds == mds)
3773 force = 1;
3774 spin_unlock(&dentry->d_lock);
3775
3776 ret = ceph_encode_inode_release(p, dir, mds, drop, unless, force);
3777
3778 spin_lock(&dentry->d_lock);
3779 if (ret && di->lease_session && di->lease_session->s_mds == mds) {
3780 dout("encode_dentry_release %p mds%d seq %d\n",
3781 dentry, mds, (int)di->lease_seq);
3782 rel->dname_len = cpu_to_le32(dentry->d_name.len);
3783 memcpy(*p, dentry->d_name.name, dentry->d_name.len);
3784 *p += dentry->d_name.len;
3785 rel->dname_seq = cpu_to_le32(di->lease_seq);
3786 __ceph_mdsc_drop_dentry_lease(dentry);
3787 }
3788 spin_unlock(&dentry->d_lock);
3789 return ret;
3790}
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}