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