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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 <linux/ceph/decode.h>
14#include <linux/ceph/messenger.h>
15
16/*
17 * Capability management
18 *
19 * The Ceph metadata servers control client access to inode metadata
20 * and file data by issuing capabilities, granting clients permission
21 * to read and/or write both inode field and file data to OSDs
22 * (storage nodes). Each capability consists of a set of bits
23 * indicating which operations are allowed.
24 *
25 * If the client holds a *_SHARED cap, the client has a coherent value
26 * that can be safely read from the cached inode.
27 *
28 * In the case of a *_EXCL (exclusive) or FILE_WR capabilities, the
29 * client is allowed to change inode attributes (e.g., file size,
30 * mtime), note its dirty state in the ceph_cap, and asynchronously
31 * flush that metadata change to the MDS.
32 *
33 * In the event of a conflicting operation (perhaps by another
34 * client), the MDS will revoke the conflicting client capabilities.
35 *
36 * In order for a client to cache an inode, it must hold a capability
37 * with at least one MDS server. When inodes are released, release
38 * notifications are batched and periodically sent en masse to the MDS
39 * cluster to release server state.
40 */
41
42
43/*
44 * Generate readable cap strings for debugging output.
45 */
46#define MAX_CAP_STR 20
47static char cap_str[MAX_CAP_STR][40];
48static DEFINE_SPINLOCK(cap_str_lock);
49static int last_cap_str;
50
51static char *gcap_string(char *s, int c)
52{
53 if (c & CEPH_CAP_GSHARED)
54 *s++ = 's';
55 if (c & CEPH_CAP_GEXCL)
56 *s++ = 'x';
57 if (c & CEPH_CAP_GCACHE)
58 *s++ = 'c';
59 if (c & CEPH_CAP_GRD)
60 *s++ = 'r';
61 if (c & CEPH_CAP_GWR)
62 *s++ = 'w';
63 if (c & CEPH_CAP_GBUFFER)
64 *s++ = 'b';
65 if (c & CEPH_CAP_GLAZYIO)
66 *s++ = 'l';
67 return s;
68}
69
70const char *ceph_cap_string(int caps)
71{
72 int i;
73 char *s;
74 int c;
75
76 spin_lock(&cap_str_lock);
77 i = last_cap_str++;
78 if (last_cap_str == MAX_CAP_STR)
79 last_cap_str = 0;
80 spin_unlock(&cap_str_lock);
81
82 s = cap_str[i];
83
84 if (caps & CEPH_CAP_PIN)
85 *s++ = 'p';
86
87 c = (caps >> CEPH_CAP_SAUTH) & 3;
88 if (c) {
89 *s++ = 'A';
90 s = gcap_string(s, c);
91 }
92
93 c = (caps >> CEPH_CAP_SLINK) & 3;
94 if (c) {
95 *s++ = 'L';
96 s = gcap_string(s, c);
97 }
98
99 c = (caps >> CEPH_CAP_SXATTR) & 3;
100 if (c) {
101 *s++ = 'X';
102 s = gcap_string(s, c);
103 }
104
105 c = caps >> CEPH_CAP_SFILE;
106 if (c) {
107 *s++ = 'F';
108 s = gcap_string(s, c);
109 }
110
111 if (s == cap_str[i])
112 *s++ = '-';
113 *s = 0;
114 return cap_str[i];
115}
116
117void ceph_caps_init(struct ceph_mds_client *mdsc)
118{
119 INIT_LIST_HEAD(&mdsc->caps_list);
120 spin_lock_init(&mdsc->caps_list_lock);
121}
122
123void ceph_caps_finalize(struct ceph_mds_client *mdsc)
124{
125 struct ceph_cap *cap;
126
127 spin_lock(&mdsc->caps_list_lock);
128 while (!list_empty(&mdsc->caps_list)) {
129 cap = list_first_entry(&mdsc->caps_list,
130 struct ceph_cap, caps_item);
131 list_del(&cap->caps_item);
132 kmem_cache_free(ceph_cap_cachep, cap);
133 }
134 mdsc->caps_total_count = 0;
135 mdsc->caps_avail_count = 0;
136 mdsc->caps_use_count = 0;
137 mdsc->caps_reserve_count = 0;
138 mdsc->caps_min_count = 0;
139 spin_unlock(&mdsc->caps_list_lock);
140}
141
142void ceph_adjust_min_caps(struct ceph_mds_client *mdsc, int delta)
143{
144 spin_lock(&mdsc->caps_list_lock);
145 mdsc->caps_min_count += delta;
146 BUG_ON(mdsc->caps_min_count < 0);
147 spin_unlock(&mdsc->caps_list_lock);
148}
149
150int ceph_reserve_caps(struct ceph_mds_client *mdsc,
151 struct ceph_cap_reservation *ctx, int need)
152{
153 int i;
154 struct ceph_cap *cap;
155 int have;
156 int alloc = 0;
157 LIST_HEAD(newcaps);
158 int ret = 0;
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 ret = -ENOMEM;
179 goto out_alloc_count;
180 }
181 list_add(&cap->caps_item, &newcaps);
182 alloc++;
183 }
184 BUG_ON(have + alloc != need);
185
186 spin_lock(&mdsc->caps_list_lock);
187 mdsc->caps_total_count += alloc;
188 mdsc->caps_reserve_count += alloc;
189 list_splice(&newcaps, &mdsc->caps_list);
190
191 BUG_ON(mdsc->caps_total_count != mdsc->caps_use_count +
192 mdsc->caps_reserve_count +
193 mdsc->caps_avail_count);
194 spin_unlock(&mdsc->caps_list_lock);
195
196 ctx->count = need;
197 dout("reserve caps ctx=%p %d = %d used + %d resv + %d avail\n",
198 ctx, mdsc->caps_total_count, mdsc->caps_use_count,
199 mdsc->caps_reserve_count, mdsc->caps_avail_count);
200 return 0;
201
202out_alloc_count:
203 /* we didn't manage to reserve as much as we needed */
204 pr_warning("reserve caps ctx=%p ENOMEM need=%d got=%d\n",
205 ctx, need, have);
206 return ret;
207}
208
209int ceph_unreserve_caps(struct ceph_mds_client *mdsc,
210 struct ceph_cap_reservation *ctx)
211{
212 dout("unreserve caps ctx=%p count=%d\n", ctx, ctx->count);
213 if (ctx->count) {
214 spin_lock(&mdsc->caps_list_lock);
215 BUG_ON(mdsc->caps_reserve_count < ctx->count);
216 mdsc->caps_reserve_count -= ctx->count;
217 mdsc->caps_avail_count += ctx->count;
218 ctx->count = 0;
219 dout("unreserve caps %d = %d used + %d resv + %d avail\n",
220 mdsc->caps_total_count, mdsc->caps_use_count,
221 mdsc->caps_reserve_count, mdsc->caps_avail_count);
222 BUG_ON(mdsc->caps_total_count != mdsc->caps_use_count +
223 mdsc->caps_reserve_count +
224 mdsc->caps_avail_count);
225 spin_unlock(&mdsc->caps_list_lock);
226 }
227 return 0;
228}
229
230static struct ceph_cap *get_cap(struct ceph_mds_client *mdsc,
231 struct ceph_cap_reservation *ctx)
232{
233 struct ceph_cap *cap = NULL;
234
235 /* temporary, until we do something about cap import/export */
236 if (!ctx) {
237 cap = kmem_cache_alloc(ceph_cap_cachep, GFP_NOFS);
238 if (cap) {
239 mdsc->caps_use_count++;
240 mdsc->caps_total_count++;
241 }
242 return cap;
243 }
244
245 spin_lock(&mdsc->caps_list_lock);
246 dout("get_cap ctx=%p (%d) %d = %d used + %d resv + %d avail\n",
247 ctx, ctx->count, mdsc->caps_total_count, mdsc->caps_use_count,
248 mdsc->caps_reserve_count, mdsc->caps_avail_count);
249 BUG_ON(!ctx->count);
250 BUG_ON(ctx->count > mdsc->caps_reserve_count);
251 BUG_ON(list_empty(&mdsc->caps_list));
252
253 ctx->count--;
254 mdsc->caps_reserve_count--;
255 mdsc->caps_use_count++;
256
257 cap = list_first_entry(&mdsc->caps_list, struct ceph_cap, caps_item);
258 list_del(&cap->caps_item);
259
260 BUG_ON(mdsc->caps_total_count != mdsc->caps_use_count +
261 mdsc->caps_reserve_count + mdsc->caps_avail_count);
262 spin_unlock(&mdsc->caps_list_lock);
263 return cap;
264}
265
266void ceph_put_cap(struct ceph_mds_client *mdsc, struct ceph_cap *cap)
267{
268 spin_lock(&mdsc->caps_list_lock);
269 dout("put_cap %p %d = %d used + %d resv + %d avail\n",
270 cap, mdsc->caps_total_count, mdsc->caps_use_count,
271 mdsc->caps_reserve_count, mdsc->caps_avail_count);
272 mdsc->caps_use_count--;
273 /*
274 * Keep some preallocated caps around (ceph_min_count), to
275 * avoid lots of free/alloc churn.
276 */
277 if (mdsc->caps_avail_count >= mdsc->caps_reserve_count +
278 mdsc->caps_min_count) {
279 mdsc->caps_total_count--;
280 kmem_cache_free(ceph_cap_cachep, cap);
281 } else {
282 mdsc->caps_avail_count++;
283 list_add(&cap->caps_item, &mdsc->caps_list);
284 }
285
286 BUG_ON(mdsc->caps_total_count != mdsc->caps_use_count +
287 mdsc->caps_reserve_count + mdsc->caps_avail_count);
288 spin_unlock(&mdsc->caps_list_lock);
289}
290
291void ceph_reservation_status(struct ceph_fs_client *fsc,
292 int *total, int *avail, int *used, int *reserved,
293 int *min)
294{
295 struct ceph_mds_client *mdsc = fsc->mdsc;
296
297 if (total)
298 *total = mdsc->caps_total_count;
299 if (avail)
300 *avail = mdsc->caps_avail_count;
301 if (used)
302 *used = mdsc->caps_use_count;
303 if (reserved)
304 *reserved = mdsc->caps_reserve_count;
305 if (min)
306 *min = mdsc->caps_min_count;
307}
308
309/*
310 * Find ceph_cap for given mds, if any.
311 *
312 * Called with i_lock held.
313 */
314static struct ceph_cap *__get_cap_for_mds(struct ceph_inode_info *ci, int mds)
315{
316 struct ceph_cap *cap;
317 struct rb_node *n = ci->i_caps.rb_node;
318
319 while (n) {
320 cap = rb_entry(n, struct ceph_cap, ci_node);
321 if (mds < cap->mds)
322 n = n->rb_left;
323 else if (mds > cap->mds)
324 n = n->rb_right;
325 else
326 return cap;
327 }
328 return NULL;
329}
330
331struct ceph_cap *ceph_get_cap_for_mds(struct ceph_inode_info *ci, int mds)
332{
333 struct ceph_cap *cap;
334
335 spin_lock(&ci->vfs_inode.i_lock);
336 cap = __get_cap_for_mds(ci, mds);
337 spin_unlock(&ci->vfs_inode.i_lock);
338 return cap;
339}
340
341/*
342 * Return id of any MDS with a cap, preferably FILE_WR|BUFFER|EXCL, else -1.
343 */
344static int __ceph_get_cap_mds(struct ceph_inode_info *ci)
345{
346 struct ceph_cap *cap;
347 int mds = -1;
348 struct rb_node *p;
349
350 /* prefer mds with WR|BUFFER|EXCL caps */
351 for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
352 cap = rb_entry(p, struct ceph_cap, ci_node);
353 mds = cap->mds;
354 if (cap->issued & (CEPH_CAP_FILE_WR |
355 CEPH_CAP_FILE_BUFFER |
356 CEPH_CAP_FILE_EXCL))
357 break;
358 }
359 return mds;
360}
361
362int ceph_get_cap_mds(struct inode *inode)
363{
364 int mds;
365 spin_lock(&inode->i_lock);
366 mds = __ceph_get_cap_mds(ceph_inode(inode));
367 spin_unlock(&inode->i_lock);
368 return mds;
369}
370
371/*
372 * Called under i_lock.
373 */
374static void __insert_cap_node(struct ceph_inode_info *ci,
375 struct ceph_cap *new)
376{
377 struct rb_node **p = &ci->i_caps.rb_node;
378 struct rb_node *parent = NULL;
379 struct ceph_cap *cap = NULL;
380
381 while (*p) {
382 parent = *p;
383 cap = rb_entry(parent, struct ceph_cap, ci_node);
384 if (new->mds < cap->mds)
385 p = &(*p)->rb_left;
386 else if (new->mds > cap->mds)
387 p = &(*p)->rb_right;
388 else
389 BUG();
390 }
391
392 rb_link_node(&new->ci_node, parent, p);
393 rb_insert_color(&new->ci_node, &ci->i_caps);
394}
395
396/*
397 * (re)set cap hold timeouts, which control the delayed release
398 * of unused caps back to the MDS. Should be called on cap use.
399 */
400static void __cap_set_timeouts(struct ceph_mds_client *mdsc,
401 struct ceph_inode_info *ci)
402{
403 struct ceph_mount_options *ma = mdsc->fsc->mount_options;
404
405 ci->i_hold_caps_min = round_jiffies(jiffies +
406 ma->caps_wanted_delay_min * HZ);
407 ci->i_hold_caps_max = round_jiffies(jiffies +
408 ma->caps_wanted_delay_max * HZ);
409 dout("__cap_set_timeouts %p min %lu max %lu\n", &ci->vfs_inode,
410 ci->i_hold_caps_min - jiffies, ci->i_hold_caps_max - jiffies);
411}
412
413/*
414 * (Re)queue cap at the end of the delayed cap release list.
415 *
416 * If I_FLUSH is set, leave the inode at the front of the list.
417 *
418 * Caller holds i_lock
419 * -> we take mdsc->cap_delay_lock
420 */
421static void __cap_delay_requeue(struct ceph_mds_client *mdsc,
422 struct ceph_inode_info *ci)
423{
424 __cap_set_timeouts(mdsc, ci);
425 dout("__cap_delay_requeue %p flags %d at %lu\n", &ci->vfs_inode,
426 ci->i_ceph_flags, ci->i_hold_caps_max);
427 if (!mdsc->stopping) {
428 spin_lock(&mdsc->cap_delay_lock);
429 if (!list_empty(&ci->i_cap_delay_list)) {
430 if (ci->i_ceph_flags & CEPH_I_FLUSH)
431 goto no_change;
432 list_del_init(&ci->i_cap_delay_list);
433 }
434 list_add_tail(&ci->i_cap_delay_list, &mdsc->cap_delay_list);
435no_change:
436 spin_unlock(&mdsc->cap_delay_lock);
437 }
438}
439
440/*
441 * Queue an inode for immediate writeback. Mark inode with I_FLUSH,
442 * indicating we should send a cap message to flush dirty metadata
443 * asap, and move to the front of the delayed cap list.
444 */
445static void __cap_delay_requeue_front(struct ceph_mds_client *mdsc,
446 struct ceph_inode_info *ci)
447{
448 dout("__cap_delay_requeue_front %p\n", &ci->vfs_inode);
449 spin_lock(&mdsc->cap_delay_lock);
450 ci->i_ceph_flags |= CEPH_I_FLUSH;
451 if (!list_empty(&ci->i_cap_delay_list))
452 list_del_init(&ci->i_cap_delay_list);
453 list_add(&ci->i_cap_delay_list, &mdsc->cap_delay_list);
454 spin_unlock(&mdsc->cap_delay_lock);
455}
456
457/*
458 * Cancel delayed work on cap.
459 *
460 * Caller must hold i_lock.
461 */
462static void __cap_delay_cancel(struct ceph_mds_client *mdsc,
463 struct ceph_inode_info *ci)
464{
465 dout("__cap_delay_cancel %p\n", &ci->vfs_inode);
466 if (list_empty(&ci->i_cap_delay_list))
467 return;
468 spin_lock(&mdsc->cap_delay_lock);
469 list_del_init(&ci->i_cap_delay_list);
470 spin_unlock(&mdsc->cap_delay_lock);
471}
472
473/*
474 * Common issue checks for add_cap, handle_cap_grant.
475 */
476static void __check_cap_issue(struct ceph_inode_info *ci, struct ceph_cap *cap,
477 unsigned issued)
478{
479 unsigned had = __ceph_caps_issued(ci, NULL);
480
481 /*
482 * Each time we receive FILE_CACHE anew, we increment
483 * i_rdcache_gen.
484 */
485 if ((issued & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) &&
486 (had & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) == 0)
487 ci->i_rdcache_gen++;
488
489 /*
490 * if we are newly issued FILE_SHARED, clear I_COMPLETE; we
491 * don't know what happened to this directory while we didn't
492 * have the cap.
493 */
494 if ((issued & CEPH_CAP_FILE_SHARED) &&
495 (had & CEPH_CAP_FILE_SHARED) == 0) {
496 ci->i_shared_gen++;
497 if (S_ISDIR(ci->vfs_inode.i_mode)) {
498 dout(" marking %p NOT complete\n", &ci->vfs_inode);
499 ci->i_ceph_flags &= ~CEPH_I_COMPLETE;
500 }
501 }
502}
503
504/*
505 * Add a capability under the given MDS session.
506 *
507 * Caller should hold session snap_rwsem (read) and s_mutex.
508 *
509 * @fmode is the open file mode, if we are opening a file, otherwise
510 * it is < 0. (This is so we can atomically add the cap and add an
511 * open file reference to it.)
512 */
513int ceph_add_cap(struct inode *inode,
514 struct ceph_mds_session *session, u64 cap_id,
515 int fmode, unsigned issued, unsigned wanted,
516 unsigned seq, unsigned mseq, u64 realmino, int flags,
517 struct ceph_cap_reservation *caps_reservation)
518{
519 struct ceph_mds_client *mdsc = ceph_inode_to_client(inode)->mdsc;
520 struct ceph_inode_info *ci = ceph_inode(inode);
521 struct ceph_cap *new_cap = NULL;
522 struct ceph_cap *cap;
523 int mds = session->s_mds;
524 int actual_wanted;
525
526 dout("add_cap %p mds%d cap %llx %s seq %d\n", inode,
527 session->s_mds, cap_id, ceph_cap_string(issued), seq);
528
529 /*
530 * If we are opening the file, include file mode wanted bits
531 * in wanted.
532 */
533 if (fmode >= 0)
534 wanted |= ceph_caps_for_mode(fmode);
535
536retry:
537 spin_lock(&inode->i_lock);
538 cap = __get_cap_for_mds(ci, mds);
539 if (!cap) {
540 if (new_cap) {
541 cap = new_cap;
542 new_cap = NULL;
543 } else {
544 spin_unlock(&inode->i_lock);
545 new_cap = get_cap(mdsc, caps_reservation);
546 if (new_cap == NULL)
547 return -ENOMEM;
548 goto retry;
549 }
550
551 cap->issued = 0;
552 cap->implemented = 0;
553 cap->mds = mds;
554 cap->mds_wanted = 0;
555
556 cap->ci = ci;
557 __insert_cap_node(ci, cap);
558
559 /* clear out old exporting info? (i.e. on cap import) */
560 if (ci->i_cap_exporting_mds == mds) {
561 ci->i_cap_exporting_issued = 0;
562 ci->i_cap_exporting_mseq = 0;
563 ci->i_cap_exporting_mds = -1;
564 }
565
566 /* add to session cap list */
567 cap->session = session;
568 spin_lock(&session->s_cap_lock);
569 list_add_tail(&cap->session_caps, &session->s_caps);
570 session->s_nr_caps++;
571 spin_unlock(&session->s_cap_lock);
572 } else if (new_cap)
573 ceph_put_cap(mdsc, new_cap);
574
575 if (!ci->i_snap_realm) {
576 /*
577 * add this inode to the appropriate snap realm
578 */
579 struct ceph_snap_realm *realm = ceph_lookup_snap_realm(mdsc,
580 realmino);
581 if (realm) {
582 ceph_get_snap_realm(mdsc, realm);
583 spin_lock(&realm->inodes_with_caps_lock);
584 ci->i_snap_realm = realm;
585 list_add(&ci->i_snap_realm_item,
586 &realm->inodes_with_caps);
587 spin_unlock(&realm->inodes_with_caps_lock);
588 } else {
589 pr_err("ceph_add_cap: couldn't find snap realm %llx\n",
590 realmino);
591 WARN_ON(!realm);
592 }
593 }
594
595 __check_cap_issue(ci, cap, issued);
596
597 /*
598 * If we are issued caps we don't want, or the mds' wanted
599 * value appears to be off, queue a check so we'll release
600 * later and/or update the mds wanted value.
601 */
602 actual_wanted = __ceph_caps_wanted(ci);
603 if ((wanted & ~actual_wanted) ||
604 (issued & ~actual_wanted & CEPH_CAP_ANY_WR)) {
605 dout(" issued %s, mds wanted %s, actual %s, queueing\n",
606 ceph_cap_string(issued), ceph_cap_string(wanted),
607 ceph_cap_string(actual_wanted));
608 __cap_delay_requeue(mdsc, ci);
609 }
610
611 if (flags & CEPH_CAP_FLAG_AUTH)
612 ci->i_auth_cap = cap;
613 else if (ci->i_auth_cap == cap)
614 ci->i_auth_cap = NULL;
615
616 dout("add_cap inode %p (%llx.%llx) cap %p %s now %s seq %d mds%d\n",
617 inode, ceph_vinop(inode), cap, ceph_cap_string(issued),
618 ceph_cap_string(issued|cap->issued), seq, mds);
619 cap->cap_id = cap_id;
620 cap->issued = issued;
621 cap->implemented |= issued;
622 cap->mds_wanted |= wanted;
623 cap->seq = seq;
624 cap->issue_seq = seq;
625 cap->mseq = mseq;
626 cap->cap_gen = session->s_cap_gen;
627
628 if (fmode >= 0)
629 __ceph_get_fmode(ci, fmode);
630 spin_unlock(&inode->i_lock);
631 wake_up_all(&ci->i_cap_wq);
632 return 0;
633}
634
635/*
636 * Return true if cap has not timed out and belongs to the current
637 * generation of the MDS session (i.e. has not gone 'stale' due to
638 * us losing touch with the mds).
639 */
640static int __cap_is_valid(struct ceph_cap *cap)
641{
642 unsigned long ttl;
643 u32 gen;
644
645 spin_lock(&cap->session->s_cap_lock);
646 gen = cap->session->s_cap_gen;
647 ttl = cap->session->s_cap_ttl;
648 spin_unlock(&cap->session->s_cap_lock);
649
650 if (cap->cap_gen < gen || time_after_eq(jiffies, ttl)) {
651 dout("__cap_is_valid %p cap %p issued %s "
652 "but STALE (gen %u vs %u)\n", &cap->ci->vfs_inode,
653 cap, ceph_cap_string(cap->issued), cap->cap_gen, gen);
654 return 0;
655 }
656
657 return 1;
658}
659
660/*
661 * Return set of valid cap bits issued to us. Note that caps time
662 * out, and may be invalidated in bulk if the client session times out
663 * and session->s_cap_gen is bumped.
664 */
665int __ceph_caps_issued(struct ceph_inode_info *ci, int *implemented)
666{
667 int have = ci->i_snap_caps | ci->i_cap_exporting_issued;
668 struct ceph_cap *cap;
669 struct rb_node *p;
670
671 if (implemented)
672 *implemented = 0;
673 for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
674 cap = rb_entry(p, struct ceph_cap, ci_node);
675 if (!__cap_is_valid(cap))
676 continue;
677 dout("__ceph_caps_issued %p cap %p issued %s\n",
678 &ci->vfs_inode, cap, ceph_cap_string(cap->issued));
679 have |= cap->issued;
680 if (implemented)
681 *implemented |= cap->implemented;
682 }
683 return have;
684}
685
686/*
687 * Get cap bits issued by caps other than @ocap
688 */
689int __ceph_caps_issued_other(struct ceph_inode_info *ci, struct ceph_cap *ocap)
690{
691 int have = ci->i_snap_caps;
692 struct ceph_cap *cap;
693 struct rb_node *p;
694
695 for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
696 cap = rb_entry(p, struct ceph_cap, ci_node);
697 if (cap == ocap)
698 continue;
699 if (!__cap_is_valid(cap))
700 continue;
701 have |= cap->issued;
702 }
703 return have;
704}
705
706/*
707 * Move a cap to the end of the LRU (oldest caps at list head, newest
708 * at list tail).
709 */
710static void __touch_cap(struct ceph_cap *cap)
711{
712 struct ceph_mds_session *s = cap->session;
713
714 spin_lock(&s->s_cap_lock);
715 if (s->s_cap_iterator == NULL) {
716 dout("__touch_cap %p cap %p mds%d\n", &cap->ci->vfs_inode, cap,
717 s->s_mds);
718 list_move_tail(&cap->session_caps, &s->s_caps);
719 } else {
720 dout("__touch_cap %p cap %p mds%d NOP, iterating over caps\n",
721 &cap->ci->vfs_inode, cap, s->s_mds);
722 }
723 spin_unlock(&s->s_cap_lock);
724}
725
726/*
727 * Check if we hold the given mask. If so, move the cap(s) to the
728 * front of their respective LRUs. (This is the preferred way for
729 * callers to check for caps they want.)
730 */
731int __ceph_caps_issued_mask(struct ceph_inode_info *ci, int mask, int touch)
732{
733 struct ceph_cap *cap;
734 struct rb_node *p;
735 int have = ci->i_snap_caps;
736
737 if ((have & mask) == mask) {
738 dout("__ceph_caps_issued_mask %p snap issued %s"
739 " (mask %s)\n", &ci->vfs_inode,
740 ceph_cap_string(have),
741 ceph_cap_string(mask));
742 return 1;
743 }
744
745 for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
746 cap = rb_entry(p, struct ceph_cap, ci_node);
747 if (!__cap_is_valid(cap))
748 continue;
749 if ((cap->issued & mask) == mask) {
750 dout("__ceph_caps_issued_mask %p cap %p issued %s"
751 " (mask %s)\n", &ci->vfs_inode, cap,
752 ceph_cap_string(cap->issued),
753 ceph_cap_string(mask));
754 if (touch)
755 __touch_cap(cap);
756 return 1;
757 }
758
759 /* does a combination of caps satisfy mask? */
760 have |= cap->issued;
761 if ((have & mask) == mask) {
762 dout("__ceph_caps_issued_mask %p combo issued %s"
763 " (mask %s)\n", &ci->vfs_inode,
764 ceph_cap_string(cap->issued),
765 ceph_cap_string(mask));
766 if (touch) {
767 struct rb_node *q;
768
769 /* touch this + preceding caps */
770 __touch_cap(cap);
771 for (q = rb_first(&ci->i_caps); q != p;
772 q = rb_next(q)) {
773 cap = rb_entry(q, struct ceph_cap,
774 ci_node);
775 if (!__cap_is_valid(cap))
776 continue;
777 __touch_cap(cap);
778 }
779 }
780 return 1;
781 }
782 }
783
784 return 0;
785}
786
787/*
788 * Return true if mask caps are currently being revoked by an MDS.
789 */
790int ceph_caps_revoking(struct ceph_inode_info *ci, int mask)
791{
792 struct inode *inode = &ci->vfs_inode;
793 struct ceph_cap *cap;
794 struct rb_node *p;
795 int ret = 0;
796
797 spin_lock(&inode->i_lock);
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 (cap->implemented & ~cap->issued & mask)) {
802 ret = 1;
803 break;
804 }
805 }
806 spin_unlock(&inode->i_lock);
807 dout("ceph_caps_revoking %p %s = %d\n", inode,
808 ceph_cap_string(mask), ret);
809 return ret;
810}
811
812int __ceph_caps_used(struct ceph_inode_info *ci)
813{
814 int used = 0;
815 if (ci->i_pin_ref)
816 used |= CEPH_CAP_PIN;
817 if (ci->i_rd_ref)
818 used |= CEPH_CAP_FILE_RD;
819 if (ci->i_rdcache_ref || ci->vfs_inode.i_data.nrpages)
820 used |= CEPH_CAP_FILE_CACHE;
821 if (ci->i_wr_ref)
822 used |= CEPH_CAP_FILE_WR;
823 if (ci->i_wb_ref || ci->i_wrbuffer_ref)
824 used |= CEPH_CAP_FILE_BUFFER;
825 return used;
826}
827
828/*
829 * wanted, by virtue of open file modes
830 */
831int __ceph_caps_file_wanted(struct ceph_inode_info *ci)
832{
833 int want = 0;
834 int mode;
835 for (mode = 0; mode < CEPH_FILE_MODE_NUM; mode++)
836 if (ci->i_nr_by_mode[mode])
837 want |= ceph_caps_for_mode(mode);
838 return want;
839}
840
841/*
842 * Return caps we have registered with the MDS(s) as 'wanted'.
843 */
844int __ceph_caps_mds_wanted(struct ceph_inode_info *ci)
845{
846 struct ceph_cap *cap;
847 struct rb_node *p;
848 int mds_wanted = 0;
849
850 for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
851 cap = rb_entry(p, struct ceph_cap, ci_node);
852 if (!__cap_is_valid(cap))
853 continue;
854 mds_wanted |= cap->mds_wanted;
855 }
856 return mds_wanted;
857}
858
859/*
860 * called under i_lock
861 */
862static int __ceph_is_any_caps(struct ceph_inode_info *ci)
863{
864 return !RB_EMPTY_ROOT(&ci->i_caps) || ci->i_cap_exporting_mds >= 0;
865}
866
867/*
868 * Remove a cap. Take steps to deal with a racing iterate_session_caps.
869 *
870 * caller should hold i_lock.
871 * caller will not hold session s_mutex if called from destroy_inode.
872 */
873void __ceph_remove_cap(struct ceph_cap *cap)
874{
875 struct ceph_mds_session *session = cap->session;
876 struct ceph_inode_info *ci = cap->ci;
877 struct ceph_mds_client *mdsc =
878 ceph_sb_to_client(ci->vfs_inode.i_sb)->mdsc;
879 int removed = 0;
880
881 dout("__ceph_remove_cap %p from %p\n", cap, &ci->vfs_inode);
882
883 /* remove from session list */
884 spin_lock(&session->s_cap_lock);
885 if (session->s_cap_iterator == cap) {
886 /* not yet, we are iterating over this very cap */
887 dout("__ceph_remove_cap delaying %p removal from session %p\n",
888 cap, cap->session);
889 } else {
890 list_del_init(&cap->session_caps);
891 session->s_nr_caps--;
892 cap->session = NULL;
893 removed = 1;
894 }
895 /* protect backpointer with s_cap_lock: see iterate_session_caps */
896 cap->ci = NULL;
897 spin_unlock(&session->s_cap_lock);
898
899 /* remove from inode list */
900 rb_erase(&cap->ci_node, &ci->i_caps);
901 if (ci->i_auth_cap == cap)
902 ci->i_auth_cap = NULL;
903
904 if (removed)
905 ceph_put_cap(mdsc, cap);
906
907 if (!__ceph_is_any_caps(ci) && ci->i_snap_realm) {
908 struct ceph_snap_realm *realm = ci->i_snap_realm;
909 spin_lock(&realm->inodes_with_caps_lock);
910 list_del_init(&ci->i_snap_realm_item);
911 ci->i_snap_realm_counter++;
912 ci->i_snap_realm = NULL;
913 spin_unlock(&realm->inodes_with_caps_lock);
914 ceph_put_snap_realm(mdsc, realm);
915 }
916 if (!__ceph_is_any_real_caps(ci))
917 __cap_delay_cancel(mdsc, ci);
918}
919
920/*
921 * Build and send a cap message to the given MDS.
922 *
923 * Caller should be holding s_mutex.
924 */
925static int send_cap_msg(struct ceph_mds_session *session,
926 u64 ino, u64 cid, int op,
927 int caps, int wanted, int dirty,
928 u32 seq, u64 flush_tid, u32 issue_seq, u32 mseq,
929 u64 size, u64 max_size,
930 struct timespec *mtime, struct timespec *atime,
931 u64 time_warp_seq,
932 uid_t uid, gid_t gid, mode_t mode,
933 u64 xattr_version,
934 struct ceph_buffer *xattrs_buf,
935 u64 follows)
936{
937 struct ceph_mds_caps *fc;
938 struct ceph_msg *msg;
939
940 dout("send_cap_msg %s %llx %llx caps %s wanted %s dirty %s"
941 " seq %u/%u mseq %u follows %lld size %llu/%llu"
942 " xattr_ver %llu xattr_len %d\n", ceph_cap_op_name(op),
943 cid, ino, ceph_cap_string(caps), ceph_cap_string(wanted),
944 ceph_cap_string(dirty),
945 seq, issue_seq, mseq, follows, size, max_size,
946 xattr_version, xattrs_buf ? (int)xattrs_buf->vec.iov_len : 0);
947
948 msg = ceph_msg_new(CEPH_MSG_CLIENT_CAPS, sizeof(*fc), GFP_NOFS);
949 if (!msg)
950 return -ENOMEM;
951
952 msg->hdr.tid = cpu_to_le64(flush_tid);
953
954 fc = msg->front.iov_base;
955 memset(fc, 0, sizeof(*fc));
956
957 fc->cap_id = cpu_to_le64(cid);
958 fc->op = cpu_to_le32(op);
959 fc->seq = cpu_to_le32(seq);
960 fc->issue_seq = cpu_to_le32(issue_seq);
961 fc->migrate_seq = cpu_to_le32(mseq);
962 fc->caps = cpu_to_le32(caps);
963 fc->wanted = cpu_to_le32(wanted);
964 fc->dirty = cpu_to_le32(dirty);
965 fc->ino = cpu_to_le64(ino);
966 fc->snap_follows = cpu_to_le64(follows);
967
968 fc->size = cpu_to_le64(size);
969 fc->max_size = cpu_to_le64(max_size);
970 if (mtime)
971 ceph_encode_timespec(&fc->mtime, mtime);
972 if (atime)
973 ceph_encode_timespec(&fc->atime, atime);
974 fc->time_warp_seq = cpu_to_le32(time_warp_seq);
975
976 fc->uid = cpu_to_le32(uid);
977 fc->gid = cpu_to_le32(gid);
978 fc->mode = cpu_to_le32(mode);
979
980 fc->xattr_version = cpu_to_le64(xattr_version);
981 if (xattrs_buf) {
982 msg->middle = ceph_buffer_get(xattrs_buf);
983 fc->xattr_len = cpu_to_le32(xattrs_buf->vec.iov_len);
984 msg->hdr.middle_len = cpu_to_le32(xattrs_buf->vec.iov_len);
985 }
986
987 ceph_con_send(&session->s_con, msg);
988 return 0;
989}
990
991static void __queue_cap_release(struct ceph_mds_session *session,
992 u64 ino, u64 cap_id, u32 migrate_seq,
993 u32 issue_seq)
994{
995 struct ceph_msg *msg;
996 struct ceph_mds_cap_release *head;
997 struct ceph_mds_cap_item *item;
998
999 spin_lock(&session->s_cap_lock);
1000 BUG_ON(!session->s_num_cap_releases);
1001 msg = list_first_entry(&session->s_cap_releases,
1002 struct ceph_msg, list_head);
1003
1004 dout(" adding %llx release to mds%d msg %p (%d left)\n",
1005 ino, session->s_mds, msg, session->s_num_cap_releases);
1006
1007 BUG_ON(msg->front.iov_len + sizeof(*item) > PAGE_CACHE_SIZE);
1008 head = msg->front.iov_base;
1009 head->num = cpu_to_le32(le32_to_cpu(head->num) + 1);
1010 item = msg->front.iov_base + msg->front.iov_len;
1011 item->ino = cpu_to_le64(ino);
1012 item->cap_id = cpu_to_le64(cap_id);
1013 item->migrate_seq = cpu_to_le32(migrate_seq);
1014 item->seq = cpu_to_le32(issue_seq);
1015
1016 session->s_num_cap_releases--;
1017
1018 msg->front.iov_len += sizeof(*item);
1019 if (le32_to_cpu(head->num) == CEPH_CAPS_PER_RELEASE) {
1020 dout(" release msg %p full\n", msg);
1021 list_move_tail(&msg->list_head, &session->s_cap_releases_done);
1022 } else {
1023 dout(" release msg %p at %d/%d (%d)\n", msg,
1024 (int)le32_to_cpu(head->num),
1025 (int)CEPH_CAPS_PER_RELEASE,
1026 (int)msg->front.iov_len);
1027 }
1028 spin_unlock(&session->s_cap_lock);
1029}
1030
1031/*
1032 * Queue cap releases when an inode is dropped from our cache. Since
1033 * inode is about to be destroyed, there is no need for i_lock.
1034 */
1035void ceph_queue_caps_release(struct inode *inode)
1036{
1037 struct ceph_inode_info *ci = ceph_inode(inode);
1038 struct rb_node *p;
1039
1040 p = rb_first(&ci->i_caps);
1041 while (p) {
1042 struct ceph_cap *cap = rb_entry(p, struct ceph_cap, ci_node);
1043 struct ceph_mds_session *session = cap->session;
1044
1045 __queue_cap_release(session, ceph_ino(inode), cap->cap_id,
1046 cap->mseq, cap->issue_seq);
1047 p = rb_next(p);
1048 __ceph_remove_cap(cap);
1049 }
1050}
1051
1052/*
1053 * Send a cap msg on the given inode. Update our caps state, then
1054 * drop i_lock and send the message.
1055 *
1056 * Make note of max_size reported/requested from mds, revoked caps
1057 * that have now been implemented.
1058 *
1059 * Make half-hearted attempt ot to invalidate page cache if we are
1060 * dropping RDCACHE. Note that this will leave behind locked pages
1061 * that we'll then need to deal with elsewhere.
1062 *
1063 * Return non-zero if delayed release, or we experienced an error
1064 * such that the caller should requeue + retry later.
1065 *
1066 * called with i_lock, then drops it.
1067 * caller should hold snap_rwsem (read), s_mutex.
1068 */
1069static int __send_cap(struct ceph_mds_client *mdsc, struct ceph_cap *cap,
1070 int op, int used, int want, int retain, int flushing,
1071 unsigned *pflush_tid)
1072 __releases(cap->ci->vfs_inode->i_lock)
1073{
1074 struct ceph_inode_info *ci = cap->ci;
1075 struct inode *inode = &ci->vfs_inode;
1076 u64 cap_id = cap->cap_id;
1077 int held, revoking, dropping, keep;
1078 u64 seq, issue_seq, mseq, time_warp_seq, follows;
1079 u64 size, max_size;
1080 struct timespec mtime, atime;
1081 int wake = 0;
1082 mode_t mode;
1083 uid_t uid;
1084 gid_t gid;
1085 struct ceph_mds_session *session;
1086 u64 xattr_version = 0;
1087 struct ceph_buffer *xattr_blob = NULL;
1088 int delayed = 0;
1089 u64 flush_tid = 0;
1090 int i;
1091 int ret;
1092
1093 held = cap->issued | cap->implemented;
1094 revoking = cap->implemented & ~cap->issued;
1095 retain &= ~revoking;
1096 dropping = cap->issued & ~retain;
1097
1098 dout("__send_cap %p cap %p session %p %s -> %s (revoking %s)\n",
1099 inode, cap, cap->session,
1100 ceph_cap_string(held), ceph_cap_string(held & retain),
1101 ceph_cap_string(revoking));
1102 BUG_ON((retain & CEPH_CAP_PIN) == 0);
1103
1104 session = cap->session;
1105
1106 /* don't release wanted unless we've waited a bit. */
1107 if ((ci->i_ceph_flags & CEPH_I_NODELAY) == 0 &&
1108 time_before(jiffies, ci->i_hold_caps_min)) {
1109 dout(" delaying issued %s -> %s, wanted %s -> %s on send\n",
1110 ceph_cap_string(cap->issued),
1111 ceph_cap_string(cap->issued & retain),
1112 ceph_cap_string(cap->mds_wanted),
1113 ceph_cap_string(want));
1114 want |= cap->mds_wanted;
1115 retain |= cap->issued;
1116 delayed = 1;
1117 }
1118 ci->i_ceph_flags &= ~(CEPH_I_NODELAY | CEPH_I_FLUSH);
1119
1120 cap->issued &= retain; /* drop bits we don't want */
1121 if (cap->implemented & ~cap->issued) {
1122 /*
1123 * Wake up any waiters on wanted -> needed transition.
1124 * This is due to the weird transition from buffered
1125 * to sync IO... we need to flush dirty pages _before_
1126 * allowing sync writes to avoid reordering.
1127 */
1128 wake = 1;
1129 }
1130 cap->implemented &= cap->issued | used;
1131 cap->mds_wanted = want;
1132
1133 if (flushing) {
1134 /*
1135 * assign a tid for flush operations so we can avoid
1136 * flush1 -> dirty1 -> flush2 -> flushack1 -> mark
1137 * clean type races. track latest tid for every bit
1138 * so we can handle flush AxFw, flush Fw, and have the
1139 * first ack clean Ax.
1140 */
1141 flush_tid = ++ci->i_cap_flush_last_tid;
1142 if (pflush_tid)
1143 *pflush_tid = flush_tid;
1144 dout(" cap_flush_tid %d\n", (int)flush_tid);
1145 for (i = 0; i < CEPH_CAP_BITS; i++)
1146 if (flushing & (1 << i))
1147 ci->i_cap_flush_tid[i] = flush_tid;
1148
1149 follows = ci->i_head_snapc->seq;
1150 } else {
1151 follows = 0;
1152 }
1153
1154 keep = cap->implemented;
1155 seq = cap->seq;
1156 issue_seq = cap->issue_seq;
1157 mseq = cap->mseq;
1158 size = inode->i_size;
1159 ci->i_reported_size = size;
1160 max_size = ci->i_wanted_max_size;
1161 ci->i_requested_max_size = max_size;
1162 mtime = inode->i_mtime;
1163 atime = inode->i_atime;
1164 time_warp_seq = ci->i_time_warp_seq;
1165 uid = inode->i_uid;
1166 gid = inode->i_gid;
1167 mode = inode->i_mode;
1168
1169 if (flushing & CEPH_CAP_XATTR_EXCL) {
1170 __ceph_build_xattrs_blob(ci);
1171 xattr_blob = ci->i_xattrs.blob;
1172 xattr_version = ci->i_xattrs.version;
1173 }
1174
1175 spin_unlock(&inode->i_lock);
1176
1177 ret = send_cap_msg(session, ceph_vino(inode).ino, cap_id,
1178 op, keep, want, flushing, seq, flush_tid, issue_seq, mseq,
1179 size, max_size, &mtime, &atime, time_warp_seq,
1180 uid, gid, mode, xattr_version, xattr_blob,
1181 follows);
1182 if (ret < 0) {
1183 dout("error sending cap msg, must requeue %p\n", inode);
1184 delayed = 1;
1185 }
1186
1187 if (wake)
1188 wake_up_all(&ci->i_cap_wq);
1189
1190 return delayed;
1191}
1192
1193/*
1194 * When a snapshot is taken, clients accumulate dirty metadata on
1195 * inodes with capabilities in ceph_cap_snaps to describe the file
1196 * state at the time the snapshot was taken. This must be flushed
1197 * asynchronously back to the MDS once sync writes complete and dirty
1198 * data is written out.
1199 *
1200 * Unless @again is true, skip cap_snaps that were already sent to
1201 * the MDS (i.e., during this session).
1202 *
1203 * Called under i_lock. Takes s_mutex as needed.
1204 */
1205void __ceph_flush_snaps(struct ceph_inode_info *ci,
1206 struct ceph_mds_session **psession,
1207 int again)
1208 __releases(ci->vfs_inode->i_lock)
1209 __acquires(ci->vfs_inode->i_lock)
1210{
1211 struct inode *inode = &ci->vfs_inode;
1212 int mds;
1213 struct ceph_cap_snap *capsnap;
1214 u32 mseq;
1215 struct ceph_mds_client *mdsc = ceph_inode_to_client(inode)->mdsc;
1216 struct ceph_mds_session *session = NULL; /* if session != NULL, we hold
1217 session->s_mutex */
1218 u64 next_follows = 0; /* keep track of how far we've gotten through the
1219 i_cap_snaps list, and skip these entries next time
1220 around to avoid an infinite loop */
1221
1222 if (psession)
1223 session = *psession;
1224
1225 dout("__flush_snaps %p\n", inode);
1226retry:
1227 list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) {
1228 /* avoid an infiniute loop after retry */
1229 if (capsnap->follows < next_follows)
1230 continue;
1231 /*
1232 * we need to wait for sync writes to complete and for dirty
1233 * pages to be written out.
1234 */
1235 if (capsnap->dirty_pages || capsnap->writing)
1236 break;
1237
1238 /*
1239 * if cap writeback already occurred, we should have dropped
1240 * the capsnap in ceph_put_wrbuffer_cap_refs.
1241 */
1242 BUG_ON(capsnap->dirty == 0);
1243
1244 /* pick mds, take s_mutex */
1245 if (ci->i_auth_cap == NULL) {
1246 dout("no auth cap (migrating?), doing nothing\n");
1247 goto out;
1248 }
1249
1250 /* only flush each capsnap once */
1251 if (!again && !list_empty(&capsnap->flushing_item)) {
1252 dout("already flushed %p, skipping\n", capsnap);
1253 continue;
1254 }
1255
1256 mds = ci->i_auth_cap->session->s_mds;
1257 mseq = ci->i_auth_cap->mseq;
1258
1259 if (session && session->s_mds != mds) {
1260 dout("oops, wrong session %p mutex\n", session);
1261 mutex_unlock(&session->s_mutex);
1262 ceph_put_mds_session(session);
1263 session = NULL;
1264 }
1265 if (!session) {
1266 spin_unlock(&inode->i_lock);
1267 mutex_lock(&mdsc->mutex);
1268 session = __ceph_lookup_mds_session(mdsc, mds);
1269 mutex_unlock(&mdsc->mutex);
1270 if (session) {
1271 dout("inverting session/ino locks on %p\n",
1272 session);
1273 mutex_lock(&session->s_mutex);
1274 }
1275 /*
1276 * if session == NULL, we raced against a cap
1277 * deletion or migration. retry, and we'll
1278 * get a better @mds value next time.
1279 */
1280 spin_lock(&inode->i_lock);
1281 goto retry;
1282 }
1283
1284 capsnap->flush_tid = ++ci->i_cap_flush_last_tid;
1285 atomic_inc(&capsnap->nref);
1286 if (!list_empty(&capsnap->flushing_item))
1287 list_del_init(&capsnap->flushing_item);
1288 list_add_tail(&capsnap->flushing_item,
1289 &session->s_cap_snaps_flushing);
1290 spin_unlock(&inode->i_lock);
1291
1292 dout("flush_snaps %p cap_snap %p follows %lld tid %llu\n",
1293 inode, capsnap, capsnap->follows, capsnap->flush_tid);
1294 send_cap_msg(session, ceph_vino(inode).ino, 0,
1295 CEPH_CAP_OP_FLUSHSNAP, capsnap->issued, 0,
1296 capsnap->dirty, 0, capsnap->flush_tid, 0, mseq,
1297 capsnap->size, 0,
1298 &capsnap->mtime, &capsnap->atime,
1299 capsnap->time_warp_seq,
1300 capsnap->uid, capsnap->gid, capsnap->mode,
1301 capsnap->xattr_version, capsnap->xattr_blob,
1302 capsnap->follows);
1303
1304 next_follows = capsnap->follows + 1;
1305 ceph_put_cap_snap(capsnap);
1306
1307 spin_lock(&inode->i_lock);
1308 goto retry;
1309 }
1310
1311 /* we flushed them all; remove this inode from the queue */
1312 spin_lock(&mdsc->snap_flush_lock);
1313 list_del_init(&ci->i_snap_flush_item);
1314 spin_unlock(&mdsc->snap_flush_lock);
1315
1316out:
1317 if (psession)
1318 *psession = session;
1319 else if (session) {
1320 mutex_unlock(&session->s_mutex);
1321 ceph_put_mds_session(session);
1322 }
1323}
1324
1325static void ceph_flush_snaps(struct ceph_inode_info *ci)
1326{
1327 struct inode *inode = &ci->vfs_inode;
1328
1329 spin_lock(&inode->i_lock);
1330 __ceph_flush_snaps(ci, NULL, 0);
1331 spin_unlock(&inode->i_lock);
1332}
1333
1334/*
1335 * Mark caps dirty. If inode is newly dirty, return the dirty flags.
1336 * Caller is then responsible for calling __mark_inode_dirty with the
1337 * returned flags value.
1338 */
1339int __ceph_mark_dirty_caps(struct ceph_inode_info *ci, int mask)
1340{
1341 struct ceph_mds_client *mdsc =
1342 ceph_sb_to_client(ci->vfs_inode.i_sb)->mdsc;
1343 struct inode *inode = &ci->vfs_inode;
1344 int was = ci->i_dirty_caps;
1345 int dirty = 0;
1346
1347 dout("__mark_dirty_caps %p %s dirty %s -> %s\n", &ci->vfs_inode,
1348 ceph_cap_string(mask), ceph_cap_string(was),
1349 ceph_cap_string(was | mask));
1350 ci->i_dirty_caps |= mask;
1351 if (was == 0) {
1352 if (!ci->i_head_snapc)
1353 ci->i_head_snapc = ceph_get_snap_context(
1354 ci->i_snap_realm->cached_context);
1355 dout(" inode %p now dirty snapc %p\n", &ci->vfs_inode,
1356 ci->i_head_snapc);
1357 BUG_ON(!list_empty(&ci->i_dirty_item));
1358 spin_lock(&mdsc->cap_dirty_lock);
1359 list_add(&ci->i_dirty_item, &mdsc->cap_dirty);
1360 spin_unlock(&mdsc->cap_dirty_lock);
1361 if (ci->i_flushing_caps == 0) {
1362 ihold(inode);
1363 dirty |= I_DIRTY_SYNC;
1364 }
1365 }
1366 BUG_ON(list_empty(&ci->i_dirty_item));
1367 if (((was | ci->i_flushing_caps) & CEPH_CAP_FILE_BUFFER) &&
1368 (mask & CEPH_CAP_FILE_BUFFER))
1369 dirty |= I_DIRTY_DATASYNC;
1370 __cap_delay_requeue(mdsc, ci);
1371 return dirty;
1372}
1373
1374/*
1375 * Add dirty inode to the flushing list. Assigned a seq number so we
1376 * can wait for caps to flush without starving.
1377 *
1378 * Called under i_lock.
1379 */
1380static int __mark_caps_flushing(struct inode *inode,
1381 struct ceph_mds_session *session)
1382{
1383 struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
1384 struct ceph_inode_info *ci = ceph_inode(inode);
1385 int flushing;
1386
1387 BUG_ON(ci->i_dirty_caps == 0);
1388 BUG_ON(list_empty(&ci->i_dirty_item));
1389
1390 flushing = ci->i_dirty_caps;
1391 dout("__mark_caps_flushing flushing %s, flushing_caps %s -> %s\n",
1392 ceph_cap_string(flushing),
1393 ceph_cap_string(ci->i_flushing_caps),
1394 ceph_cap_string(ci->i_flushing_caps | flushing));
1395 ci->i_flushing_caps |= flushing;
1396 ci->i_dirty_caps = 0;
1397 dout(" inode %p now !dirty\n", inode);
1398
1399 spin_lock(&mdsc->cap_dirty_lock);
1400 list_del_init(&ci->i_dirty_item);
1401
1402 ci->i_cap_flush_seq = ++mdsc->cap_flush_seq;
1403 if (list_empty(&ci->i_flushing_item)) {
1404 list_add_tail(&ci->i_flushing_item, &session->s_cap_flushing);
1405 mdsc->num_cap_flushing++;
1406 dout(" inode %p now flushing seq %lld\n", inode,
1407 ci->i_cap_flush_seq);
1408 } else {
1409 list_move_tail(&ci->i_flushing_item, &session->s_cap_flushing);
1410 dout(" inode %p now flushing (more) seq %lld\n", inode,
1411 ci->i_cap_flush_seq);
1412 }
1413 spin_unlock(&mdsc->cap_dirty_lock);
1414
1415 return flushing;
1416}
1417
1418/*
1419 * try to invalidate mapping pages without blocking.
1420 */
1421static int try_nonblocking_invalidate(struct inode *inode)
1422{
1423 struct ceph_inode_info *ci = ceph_inode(inode);
1424 u32 invalidating_gen = ci->i_rdcache_gen;
1425
1426 spin_unlock(&inode->i_lock);
1427 invalidate_mapping_pages(&inode->i_data, 0, -1);
1428 spin_lock(&inode->i_lock);
1429
1430 if (inode->i_data.nrpages == 0 &&
1431 invalidating_gen == ci->i_rdcache_gen) {
1432 /* success. */
1433 dout("try_nonblocking_invalidate %p success\n", inode);
1434 /* save any racing async invalidate some trouble */
1435 ci->i_rdcache_revoking = ci->i_rdcache_gen - 1;
1436 return 0;
1437 }
1438 dout("try_nonblocking_invalidate %p failed\n", inode);
1439 return -1;
1440}
1441
1442/*
1443 * Swiss army knife function to examine currently used and wanted
1444 * versus held caps. Release, flush, ack revoked caps to mds as
1445 * appropriate.
1446 *
1447 * CHECK_CAPS_NODELAY - caller is delayed work and we should not delay
1448 * cap release further.
1449 * CHECK_CAPS_AUTHONLY - we should only check the auth cap
1450 * CHECK_CAPS_FLUSH - we should flush any dirty caps immediately, without
1451 * further delay.
1452 */
1453void ceph_check_caps(struct ceph_inode_info *ci, int flags,
1454 struct ceph_mds_session *session)
1455{
1456 struct ceph_fs_client *fsc = ceph_inode_to_client(&ci->vfs_inode);
1457 struct ceph_mds_client *mdsc = fsc->mdsc;
1458 struct inode *inode = &ci->vfs_inode;
1459 struct ceph_cap *cap;
1460 int file_wanted, used;
1461 int took_snap_rwsem = 0; /* true if mdsc->snap_rwsem held */
1462 int issued, implemented, want, retain, revoking, flushing = 0;
1463 int mds = -1; /* keep track of how far we've gone through i_caps list
1464 to avoid an infinite loop on retry */
1465 struct rb_node *p;
1466 int tried_invalidate = 0;
1467 int delayed = 0, sent = 0, force_requeue = 0, num;
1468 int queue_invalidate = 0;
1469 int is_delayed = flags & CHECK_CAPS_NODELAY;
1470
1471 /* if we are unmounting, flush any unused caps immediately. */
1472 if (mdsc->stopping)
1473 is_delayed = 1;
1474
1475 spin_lock(&inode->i_lock);
1476
1477 if (ci->i_ceph_flags & CEPH_I_FLUSH)
1478 flags |= CHECK_CAPS_FLUSH;
1479
1480 /* flush snaps first time around only */
1481 if (!list_empty(&ci->i_cap_snaps))
1482 __ceph_flush_snaps(ci, &session, 0);
1483 goto retry_locked;
1484retry:
1485 spin_lock(&inode->i_lock);
1486retry_locked:
1487 file_wanted = __ceph_caps_file_wanted(ci);
1488 used = __ceph_caps_used(ci);
1489 want = file_wanted | used;
1490 issued = __ceph_caps_issued(ci, &implemented);
1491 revoking = implemented & ~issued;
1492
1493 retain = want | CEPH_CAP_PIN;
1494 if (!mdsc->stopping && inode->i_nlink > 0) {
1495 if (want) {
1496 retain |= CEPH_CAP_ANY; /* be greedy */
1497 } else {
1498 retain |= CEPH_CAP_ANY_SHARED;
1499 /*
1500 * keep RD only if we didn't have the file open RW,
1501 * because then the mds would revoke it anyway to
1502 * journal max_size=0.
1503 */
1504 if (ci->i_max_size == 0)
1505 retain |= CEPH_CAP_ANY_RD;
1506 }
1507 }
1508
1509 dout("check_caps %p file_want %s used %s dirty %s flushing %s"
1510 " issued %s revoking %s retain %s %s%s%s\n", inode,
1511 ceph_cap_string(file_wanted),
1512 ceph_cap_string(used), ceph_cap_string(ci->i_dirty_caps),
1513 ceph_cap_string(ci->i_flushing_caps),
1514 ceph_cap_string(issued), ceph_cap_string(revoking),
1515 ceph_cap_string(retain),
1516 (flags & CHECK_CAPS_AUTHONLY) ? " AUTHONLY" : "",
1517 (flags & CHECK_CAPS_NODELAY) ? " NODELAY" : "",
1518 (flags & CHECK_CAPS_FLUSH) ? " FLUSH" : "");
1519
1520 /*
1521 * If we no longer need to hold onto old our caps, and we may
1522 * have cached pages, but don't want them, then try to invalidate.
1523 * If we fail, it's because pages are locked.... try again later.
1524 */
1525 if ((!is_delayed || mdsc->stopping) &&
1526 ci->i_wrbuffer_ref == 0 && /* no dirty pages... */
1527 inode->i_data.nrpages && /* have cached pages */
1528 (file_wanted == 0 || /* no open files */
1529 (revoking & (CEPH_CAP_FILE_CACHE|
1530 CEPH_CAP_FILE_LAZYIO))) && /* or revoking cache */
1531 !tried_invalidate) {
1532 dout("check_caps trying to invalidate on %p\n", inode);
1533 if (try_nonblocking_invalidate(inode) < 0) {
1534 if (revoking & (CEPH_CAP_FILE_CACHE|
1535 CEPH_CAP_FILE_LAZYIO)) {
1536 dout("check_caps queuing invalidate\n");
1537 queue_invalidate = 1;
1538 ci->i_rdcache_revoking = ci->i_rdcache_gen;
1539 } else {
1540 dout("check_caps failed to invalidate pages\n");
1541 /* we failed to invalidate pages. check these
1542 caps again later. */
1543 force_requeue = 1;
1544 __cap_set_timeouts(mdsc, ci);
1545 }
1546 }
1547 tried_invalidate = 1;
1548 goto retry_locked;
1549 }
1550
1551 num = 0;
1552 for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
1553 cap = rb_entry(p, struct ceph_cap, ci_node);
1554 num++;
1555
1556 /* avoid looping forever */
1557 if (mds >= cap->mds ||
1558 ((flags & CHECK_CAPS_AUTHONLY) && cap != ci->i_auth_cap))
1559 continue;
1560
1561 /* NOTE: no side-effects allowed, until we take s_mutex */
1562
1563 revoking = cap->implemented & ~cap->issued;
1564 dout(" mds%d cap %p issued %s implemented %s revoking %s\n",
1565 cap->mds, cap, ceph_cap_string(cap->issued),
1566 ceph_cap_string(cap->implemented),
1567 ceph_cap_string(revoking));
1568
1569 if (cap == ci->i_auth_cap &&
1570 (cap->issued & CEPH_CAP_FILE_WR)) {
1571 /* request larger max_size from MDS? */
1572 if (ci->i_wanted_max_size > ci->i_max_size &&
1573 ci->i_wanted_max_size > ci->i_requested_max_size) {
1574 dout("requesting new max_size\n");
1575 goto ack;
1576 }
1577
1578 /* approaching file_max? */
1579 if ((inode->i_size << 1) >= ci->i_max_size &&
1580 (ci->i_reported_size << 1) < ci->i_max_size) {
1581 dout("i_size approaching max_size\n");
1582 goto ack;
1583 }
1584 }
1585 /* flush anything dirty? */
1586 if (cap == ci->i_auth_cap && (flags & CHECK_CAPS_FLUSH) &&
1587 ci->i_dirty_caps) {
1588 dout("flushing dirty caps\n");
1589 goto ack;
1590 }
1591
1592 /* completed revocation? going down and there are no caps? */
1593 if (revoking && (revoking & used) == 0) {
1594 dout("completed revocation of %s\n",
1595 ceph_cap_string(cap->implemented & ~cap->issued));
1596 goto ack;
1597 }
1598
1599 /* want more caps from mds? */
1600 if (want & ~(cap->mds_wanted | cap->issued))
1601 goto ack;
1602
1603 /* things we might delay */
1604 if ((cap->issued & ~retain) == 0 &&
1605 cap->mds_wanted == want)
1606 continue; /* nope, all good */
1607
1608 if (is_delayed)
1609 goto ack;
1610
1611 /* delay? */
1612 if ((ci->i_ceph_flags & CEPH_I_NODELAY) == 0 &&
1613 time_before(jiffies, ci->i_hold_caps_max)) {
1614 dout(" delaying issued %s -> %s, wanted %s -> %s\n",
1615 ceph_cap_string(cap->issued),
1616 ceph_cap_string(cap->issued & retain),
1617 ceph_cap_string(cap->mds_wanted),
1618 ceph_cap_string(want));
1619 delayed++;
1620 continue;
1621 }
1622
1623ack:
1624 if (ci->i_ceph_flags & CEPH_I_NOFLUSH) {
1625 dout(" skipping %p I_NOFLUSH set\n", inode);
1626 continue;
1627 }
1628
1629 if (session && session != cap->session) {
1630 dout("oops, wrong session %p mutex\n", session);
1631 mutex_unlock(&session->s_mutex);
1632 session = NULL;
1633 }
1634 if (!session) {
1635 session = cap->session;
1636 if (mutex_trylock(&session->s_mutex) == 0) {
1637 dout("inverting session/ino locks on %p\n",
1638 session);
1639 spin_unlock(&inode->i_lock);
1640 if (took_snap_rwsem) {
1641 up_read(&mdsc->snap_rwsem);
1642 took_snap_rwsem = 0;
1643 }
1644 mutex_lock(&session->s_mutex);
1645 goto retry;
1646 }
1647 }
1648 /* take snap_rwsem after session mutex */
1649 if (!took_snap_rwsem) {
1650 if (down_read_trylock(&mdsc->snap_rwsem) == 0) {
1651 dout("inverting snap/in locks on %p\n",
1652 inode);
1653 spin_unlock(&inode->i_lock);
1654 down_read(&mdsc->snap_rwsem);
1655 took_snap_rwsem = 1;
1656 goto retry;
1657 }
1658 took_snap_rwsem = 1;
1659 }
1660
1661 if (cap == ci->i_auth_cap && ci->i_dirty_caps)
1662 flushing = __mark_caps_flushing(inode, session);
1663 else
1664 flushing = 0;
1665
1666 mds = cap->mds; /* remember mds, so we don't repeat */
1667 sent++;
1668
1669 /* __send_cap drops i_lock */
1670 delayed += __send_cap(mdsc, cap, CEPH_CAP_OP_UPDATE, used, want,
1671 retain, flushing, NULL);
1672 goto retry; /* retake i_lock and restart our cap scan. */
1673 }
1674
1675 /*
1676 * Reschedule delayed caps release if we delayed anything,
1677 * otherwise cancel.
1678 */
1679 if (delayed && is_delayed)
1680 force_requeue = 1; /* __send_cap delayed release; requeue */
1681 if (!delayed && !is_delayed)
1682 __cap_delay_cancel(mdsc, ci);
1683 else if (!is_delayed || force_requeue)
1684 __cap_delay_requeue(mdsc, ci);
1685
1686 spin_unlock(&inode->i_lock);
1687
1688 if (queue_invalidate)
1689 ceph_queue_invalidate(inode);
1690
1691 if (session)
1692 mutex_unlock(&session->s_mutex);
1693 if (took_snap_rwsem)
1694 up_read(&mdsc->snap_rwsem);
1695}
1696
1697/*
1698 * Try to flush dirty caps back to the auth mds.
1699 */
1700static int try_flush_caps(struct inode *inode, struct ceph_mds_session *session,
1701 unsigned *flush_tid)
1702{
1703 struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
1704 struct ceph_inode_info *ci = ceph_inode(inode);
1705 int unlock_session = session ? 0 : 1;
1706 int flushing = 0;
1707
1708retry:
1709 spin_lock(&inode->i_lock);
1710 if (ci->i_ceph_flags & CEPH_I_NOFLUSH) {
1711 dout("try_flush_caps skipping %p I_NOFLUSH set\n", inode);
1712 goto out;
1713 }
1714 if (ci->i_dirty_caps && ci->i_auth_cap) {
1715 struct ceph_cap *cap = ci->i_auth_cap;
1716 int used = __ceph_caps_used(ci);
1717 int want = __ceph_caps_wanted(ci);
1718 int delayed;
1719
1720 if (!session) {
1721 spin_unlock(&inode->i_lock);
1722 session = cap->session;
1723 mutex_lock(&session->s_mutex);
1724 goto retry;
1725 }
1726 BUG_ON(session != cap->session);
1727 if (cap->session->s_state < CEPH_MDS_SESSION_OPEN)
1728 goto out;
1729
1730 flushing = __mark_caps_flushing(inode, session);
1731
1732 /* __send_cap drops i_lock */
1733 delayed = __send_cap(mdsc, cap, CEPH_CAP_OP_FLUSH, used, want,
1734 cap->issued | cap->implemented, flushing,
1735 flush_tid);
1736 if (!delayed)
1737 goto out_unlocked;
1738
1739 spin_lock(&inode->i_lock);
1740 __cap_delay_requeue(mdsc, ci);
1741 }
1742out:
1743 spin_unlock(&inode->i_lock);
1744out_unlocked:
1745 if (session && unlock_session)
1746 mutex_unlock(&session->s_mutex);
1747 return flushing;
1748}
1749
1750/*
1751 * Return true if we've flushed caps through the given flush_tid.
1752 */
1753static int caps_are_flushed(struct inode *inode, unsigned tid)
1754{
1755 struct ceph_inode_info *ci = ceph_inode(inode);
1756 int i, ret = 1;
1757
1758 spin_lock(&inode->i_lock);
1759 for (i = 0; i < CEPH_CAP_BITS; i++)
1760 if ((ci->i_flushing_caps & (1 << i)) &&
1761 ci->i_cap_flush_tid[i] <= tid) {
1762 /* still flushing this bit */
1763 ret = 0;
1764 break;
1765 }
1766 spin_unlock(&inode->i_lock);
1767 return ret;
1768}
1769
1770/*
1771 * Wait on any unsafe replies for the given inode. First wait on the
1772 * newest request, and make that the upper bound. Then, if there are
1773 * more requests, keep waiting on the oldest as long as it is still older
1774 * than the original request.
1775 */
1776static void sync_write_wait(struct inode *inode)
1777{
1778 struct ceph_inode_info *ci = ceph_inode(inode);
1779 struct list_head *head = &ci->i_unsafe_writes;
1780 struct ceph_osd_request *req;
1781 u64 last_tid;
1782
1783 spin_lock(&ci->i_unsafe_lock);
1784 if (list_empty(head))
1785 goto out;
1786
1787 /* set upper bound as _last_ entry in chain */
1788 req = list_entry(head->prev, struct ceph_osd_request,
1789 r_unsafe_item);
1790 last_tid = req->r_tid;
1791
1792 do {
1793 ceph_osdc_get_request(req);
1794 spin_unlock(&ci->i_unsafe_lock);
1795 dout("sync_write_wait on tid %llu (until %llu)\n",
1796 req->r_tid, last_tid);
1797 wait_for_completion(&req->r_safe_completion);
1798 spin_lock(&ci->i_unsafe_lock);
1799 ceph_osdc_put_request(req);
1800
1801 /*
1802 * from here on look at first entry in chain, since we
1803 * only want to wait for anything older than last_tid
1804 */
1805 if (list_empty(head))
1806 break;
1807 req = list_entry(head->next, struct ceph_osd_request,
1808 r_unsafe_item);
1809 } while (req->r_tid < last_tid);
1810out:
1811 spin_unlock(&ci->i_unsafe_lock);
1812}
1813
1814int ceph_fsync(struct file *file, loff_t start, loff_t end, int datasync)
1815{
1816 struct inode *inode = file->f_mapping->host;
1817 struct ceph_inode_info *ci = ceph_inode(inode);
1818 unsigned flush_tid;
1819 int ret;
1820 int dirty;
1821
1822 dout("fsync %p%s\n", inode, datasync ? " datasync" : "");
1823 sync_write_wait(inode);
1824
1825 ret = filemap_write_and_wait_range(inode->i_mapping, start, end);
1826 if (ret < 0)
1827 return ret;
1828 mutex_lock(&inode->i_mutex);
1829
1830 dirty = try_flush_caps(inode, NULL, &flush_tid);
1831 dout("fsync dirty caps are %s\n", ceph_cap_string(dirty));
1832
1833 /*
1834 * only wait on non-file metadata writeback (the mds
1835 * can recover size and mtime, so we don't need to
1836 * wait for that)
1837 */
1838 if (!datasync && (dirty & ~CEPH_CAP_ANY_FILE_WR)) {
1839 dout("fsync waiting for flush_tid %u\n", flush_tid);
1840 ret = wait_event_interruptible(ci->i_cap_wq,
1841 caps_are_flushed(inode, flush_tid));
1842 }
1843
1844 dout("fsync %p%s done\n", inode, datasync ? " datasync" : "");
1845 mutex_unlock(&inode->i_mutex);
1846 return ret;
1847}
1848
1849/*
1850 * Flush any dirty caps back to the mds. If we aren't asked to wait,
1851 * queue inode for flush but don't do so immediately, because we can
1852 * get by with fewer MDS messages if we wait for data writeback to
1853 * complete first.
1854 */
1855int ceph_write_inode(struct inode *inode, struct writeback_control *wbc)
1856{
1857 struct ceph_inode_info *ci = ceph_inode(inode);
1858 unsigned flush_tid;
1859 int err = 0;
1860 int dirty;
1861 int wait = wbc->sync_mode == WB_SYNC_ALL;
1862
1863 dout("write_inode %p wait=%d\n", inode, wait);
1864 if (wait) {
1865 dirty = try_flush_caps(inode, NULL, &flush_tid);
1866 if (dirty)
1867 err = wait_event_interruptible(ci->i_cap_wq,
1868 caps_are_flushed(inode, flush_tid));
1869 } else {
1870 struct ceph_mds_client *mdsc =
1871 ceph_sb_to_client(inode->i_sb)->mdsc;
1872
1873 spin_lock(&inode->i_lock);
1874 if (__ceph_caps_dirty(ci))
1875 __cap_delay_requeue_front(mdsc, ci);
1876 spin_unlock(&inode->i_lock);
1877 }
1878 return err;
1879}
1880
1881/*
1882 * After a recovering MDS goes active, we need to resend any caps
1883 * we were flushing.
1884 *
1885 * Caller holds session->s_mutex.
1886 */
1887static void kick_flushing_capsnaps(struct ceph_mds_client *mdsc,
1888 struct ceph_mds_session *session)
1889{
1890 struct ceph_cap_snap *capsnap;
1891
1892 dout("kick_flushing_capsnaps mds%d\n", session->s_mds);
1893 list_for_each_entry(capsnap, &session->s_cap_snaps_flushing,
1894 flushing_item) {
1895 struct ceph_inode_info *ci = capsnap->ci;
1896 struct inode *inode = &ci->vfs_inode;
1897 struct ceph_cap *cap;
1898
1899 spin_lock(&inode->i_lock);
1900 cap = ci->i_auth_cap;
1901 if (cap && cap->session == session) {
1902 dout("kick_flushing_caps %p cap %p capsnap %p\n", inode,
1903 cap, capsnap);
1904 __ceph_flush_snaps(ci, &session, 1);
1905 } else {
1906 pr_err("%p auth cap %p not mds%d ???\n", inode,
1907 cap, session->s_mds);
1908 }
1909 spin_unlock(&inode->i_lock);
1910 }
1911}
1912
1913void ceph_kick_flushing_caps(struct ceph_mds_client *mdsc,
1914 struct ceph_mds_session *session)
1915{
1916 struct ceph_inode_info *ci;
1917
1918 kick_flushing_capsnaps(mdsc, session);
1919
1920 dout("kick_flushing_caps mds%d\n", session->s_mds);
1921 list_for_each_entry(ci, &session->s_cap_flushing, i_flushing_item) {
1922 struct inode *inode = &ci->vfs_inode;
1923 struct ceph_cap *cap;
1924 int delayed = 0;
1925
1926 spin_lock(&inode->i_lock);
1927 cap = ci->i_auth_cap;
1928 if (cap && cap->session == session) {
1929 dout("kick_flushing_caps %p cap %p %s\n", inode,
1930 cap, ceph_cap_string(ci->i_flushing_caps));
1931 delayed = __send_cap(mdsc, cap, CEPH_CAP_OP_FLUSH,
1932 __ceph_caps_used(ci),
1933 __ceph_caps_wanted(ci),
1934 cap->issued | cap->implemented,
1935 ci->i_flushing_caps, NULL);
1936 if (delayed) {
1937 spin_lock(&inode->i_lock);
1938 __cap_delay_requeue(mdsc, ci);
1939 spin_unlock(&inode->i_lock);
1940 }
1941 } else {
1942 pr_err("%p auth cap %p not mds%d ???\n", inode,
1943 cap, session->s_mds);
1944 spin_unlock(&inode->i_lock);
1945 }
1946 }
1947}
1948
1949static void kick_flushing_inode_caps(struct ceph_mds_client *mdsc,
1950 struct ceph_mds_session *session,
1951 struct inode *inode)
1952{
1953 struct ceph_inode_info *ci = ceph_inode(inode);
1954 struct ceph_cap *cap;
1955 int delayed = 0;
1956
1957 spin_lock(&inode->i_lock);
1958 cap = ci->i_auth_cap;
1959 dout("kick_flushing_inode_caps %p flushing %s flush_seq %lld\n", inode,
1960 ceph_cap_string(ci->i_flushing_caps), ci->i_cap_flush_seq);
1961 __ceph_flush_snaps(ci, &session, 1);
1962 if (ci->i_flushing_caps) {
1963 delayed = __send_cap(mdsc, cap, CEPH_CAP_OP_FLUSH,
1964 __ceph_caps_used(ci),
1965 __ceph_caps_wanted(ci),
1966 cap->issued | cap->implemented,
1967 ci->i_flushing_caps, NULL);
1968 if (delayed) {
1969 spin_lock(&inode->i_lock);
1970 __cap_delay_requeue(mdsc, ci);
1971 spin_unlock(&inode->i_lock);
1972 }
1973 } else {
1974 spin_unlock(&inode->i_lock);
1975 }
1976}
1977
1978
1979/*
1980 * Take references to capabilities we hold, so that we don't release
1981 * them to the MDS prematurely.
1982 *
1983 * Protected by i_lock.
1984 */
1985static void __take_cap_refs(struct ceph_inode_info *ci, int got)
1986{
1987 if (got & CEPH_CAP_PIN)
1988 ci->i_pin_ref++;
1989 if (got & CEPH_CAP_FILE_RD)
1990 ci->i_rd_ref++;
1991 if (got & CEPH_CAP_FILE_CACHE)
1992 ci->i_rdcache_ref++;
1993 if (got & CEPH_CAP_FILE_WR)
1994 ci->i_wr_ref++;
1995 if (got & CEPH_CAP_FILE_BUFFER) {
1996 if (ci->i_wb_ref == 0)
1997 ihold(&ci->vfs_inode);
1998 ci->i_wb_ref++;
1999 dout("__take_cap_refs %p wb %d -> %d (?)\n",
2000 &ci->vfs_inode, ci->i_wb_ref-1, ci->i_wb_ref);
2001 }
2002}
2003
2004/*
2005 * Try to grab cap references. Specify those refs we @want, and the
2006 * minimal set we @need. Also include the larger offset we are writing
2007 * to (when applicable), and check against max_size here as well.
2008 * Note that caller is responsible for ensuring max_size increases are
2009 * requested from the MDS.
2010 */
2011static int try_get_cap_refs(struct ceph_inode_info *ci, int need, int want,
2012 int *got, loff_t endoff, int *check_max, int *err)
2013{
2014 struct inode *inode = &ci->vfs_inode;
2015 int ret = 0;
2016 int have, implemented;
2017 int file_wanted;
2018
2019 dout("get_cap_refs %p need %s want %s\n", inode,
2020 ceph_cap_string(need), ceph_cap_string(want));
2021 spin_lock(&inode->i_lock);
2022
2023 /* make sure file is actually open */
2024 file_wanted = __ceph_caps_file_wanted(ci);
2025 if ((file_wanted & need) == 0) {
2026 dout("try_get_cap_refs need %s file_wanted %s, EBADF\n",
2027 ceph_cap_string(need), ceph_cap_string(file_wanted));
2028 *err = -EBADF;
2029 ret = 1;
2030 goto out;
2031 }
2032
2033 if (need & CEPH_CAP_FILE_WR) {
2034 if (endoff >= 0 && endoff > (loff_t)ci->i_max_size) {
2035 dout("get_cap_refs %p endoff %llu > maxsize %llu\n",
2036 inode, endoff, ci->i_max_size);
2037 if (endoff > ci->i_wanted_max_size) {
2038 *check_max = 1;
2039 ret = 1;
2040 }
2041 goto out;
2042 }
2043 /*
2044 * If a sync write is in progress, we must wait, so that we
2045 * can get a final snapshot value for size+mtime.
2046 */
2047 if (__ceph_have_pending_cap_snap(ci)) {
2048 dout("get_cap_refs %p cap_snap_pending\n", inode);
2049 goto out;
2050 }
2051 }
2052 have = __ceph_caps_issued(ci, &implemented);
2053
2054 /*
2055 * disallow writes while a truncate is pending
2056 */
2057 if (ci->i_truncate_pending)
2058 have &= ~CEPH_CAP_FILE_WR;
2059
2060 if ((have & need) == need) {
2061 /*
2062 * Look at (implemented & ~have & not) so that we keep waiting
2063 * on transition from wanted -> needed caps. This is needed
2064 * for WRBUFFER|WR -> WR to avoid a new WR sync write from
2065 * going before a prior buffered writeback happens.
2066 */
2067 int not = want & ~(have & need);
2068 int revoking = implemented & ~have;
2069 dout("get_cap_refs %p have %s but not %s (revoking %s)\n",
2070 inode, ceph_cap_string(have), ceph_cap_string(not),
2071 ceph_cap_string(revoking));
2072 if ((revoking & not) == 0) {
2073 *got = need | (have & want);
2074 __take_cap_refs(ci, *got);
2075 ret = 1;
2076 }
2077 } else {
2078 dout("get_cap_refs %p have %s needed %s\n", inode,
2079 ceph_cap_string(have), ceph_cap_string(need));
2080 }
2081out:
2082 spin_unlock(&inode->i_lock);
2083 dout("get_cap_refs %p ret %d got %s\n", inode,
2084 ret, ceph_cap_string(*got));
2085 return ret;
2086}
2087
2088/*
2089 * Check the offset we are writing up to against our current
2090 * max_size. If necessary, tell the MDS we want to write to
2091 * a larger offset.
2092 */
2093static void check_max_size(struct inode *inode, loff_t endoff)
2094{
2095 struct ceph_inode_info *ci = ceph_inode(inode);
2096 int check = 0;
2097
2098 /* do we need to explicitly request a larger max_size? */
2099 spin_lock(&inode->i_lock);
2100 if ((endoff >= ci->i_max_size ||
2101 endoff > (inode->i_size << 1)) &&
2102 endoff > ci->i_wanted_max_size) {
2103 dout("write %p at large endoff %llu, req max_size\n",
2104 inode, endoff);
2105 ci->i_wanted_max_size = endoff;
2106 check = 1;
2107 }
2108 spin_unlock(&inode->i_lock);
2109 if (check)
2110 ceph_check_caps(ci, CHECK_CAPS_AUTHONLY, NULL);
2111}
2112
2113/*
2114 * Wait for caps, and take cap references. If we can't get a WR cap
2115 * due to a small max_size, make sure we check_max_size (and possibly
2116 * ask the mds) so we don't get hung up indefinitely.
2117 */
2118int ceph_get_caps(struct ceph_inode_info *ci, int need, int want, int *got,
2119 loff_t endoff)
2120{
2121 int check_max, ret, err;
2122
2123retry:
2124 if (endoff > 0)
2125 check_max_size(&ci->vfs_inode, endoff);
2126 check_max = 0;
2127 err = 0;
2128 ret = wait_event_interruptible(ci->i_cap_wq,
2129 try_get_cap_refs(ci, need, want,
2130 got, endoff,
2131 &check_max, &err));
2132 if (err)
2133 ret = err;
2134 if (check_max)
2135 goto retry;
2136 return ret;
2137}
2138
2139/*
2140 * Take cap refs. Caller must already know we hold at least one ref
2141 * on the caps in question or we don't know this is safe.
2142 */
2143void ceph_get_cap_refs(struct ceph_inode_info *ci, int caps)
2144{
2145 spin_lock(&ci->vfs_inode.i_lock);
2146 __take_cap_refs(ci, caps);
2147 spin_unlock(&ci->vfs_inode.i_lock);
2148}
2149
2150/*
2151 * Release cap refs.
2152 *
2153 * If we released the last ref on any given cap, call ceph_check_caps
2154 * to release (or schedule a release).
2155 *
2156 * If we are releasing a WR cap (from a sync write), finalize any affected
2157 * cap_snap, and wake up any waiters.
2158 */
2159void ceph_put_cap_refs(struct ceph_inode_info *ci, int had)
2160{
2161 struct inode *inode = &ci->vfs_inode;
2162 int last = 0, put = 0, flushsnaps = 0, wake = 0;
2163 struct ceph_cap_snap *capsnap;
2164
2165 spin_lock(&inode->i_lock);
2166 if (had & CEPH_CAP_PIN)
2167 --ci->i_pin_ref;
2168 if (had & CEPH_CAP_FILE_RD)
2169 if (--ci->i_rd_ref == 0)
2170 last++;
2171 if (had & CEPH_CAP_FILE_CACHE)
2172 if (--ci->i_rdcache_ref == 0)
2173 last++;
2174 if (had & CEPH_CAP_FILE_BUFFER) {
2175 if (--ci->i_wb_ref == 0) {
2176 last++;
2177 put++;
2178 }
2179 dout("put_cap_refs %p wb %d -> %d (?)\n",
2180 inode, ci->i_wb_ref+1, ci->i_wb_ref);
2181 }
2182 if (had & CEPH_CAP_FILE_WR)
2183 if (--ci->i_wr_ref == 0) {
2184 last++;
2185 if (!list_empty(&ci->i_cap_snaps)) {
2186 capsnap = list_first_entry(&ci->i_cap_snaps,
2187 struct ceph_cap_snap,
2188 ci_item);
2189 if (capsnap->writing) {
2190 capsnap->writing = 0;
2191 flushsnaps =
2192 __ceph_finish_cap_snap(ci,
2193 capsnap);
2194 wake = 1;
2195 }
2196 }
2197 }
2198 spin_unlock(&inode->i_lock);
2199
2200 dout("put_cap_refs %p had %s%s%s\n", inode, ceph_cap_string(had),
2201 last ? " last" : "", put ? " put" : "");
2202
2203 if (last && !flushsnaps)
2204 ceph_check_caps(ci, 0, NULL);
2205 else if (flushsnaps)
2206 ceph_flush_snaps(ci);
2207 if (wake)
2208 wake_up_all(&ci->i_cap_wq);
2209 if (put)
2210 iput(inode);
2211}
2212
2213/*
2214 * Release @nr WRBUFFER refs on dirty pages for the given @snapc snap
2215 * context. Adjust per-snap dirty page accounting as appropriate.
2216 * Once all dirty data for a cap_snap is flushed, flush snapped file
2217 * metadata back to the MDS. If we dropped the last ref, call
2218 * ceph_check_caps.
2219 */
2220void ceph_put_wrbuffer_cap_refs(struct ceph_inode_info *ci, int nr,
2221 struct ceph_snap_context *snapc)
2222{
2223 struct inode *inode = &ci->vfs_inode;
2224 int last = 0;
2225 int complete_capsnap = 0;
2226 int drop_capsnap = 0;
2227 int found = 0;
2228 struct ceph_cap_snap *capsnap = NULL;
2229
2230 spin_lock(&inode->i_lock);
2231 ci->i_wrbuffer_ref -= nr;
2232 last = !ci->i_wrbuffer_ref;
2233
2234 if (ci->i_head_snapc == snapc) {
2235 ci->i_wrbuffer_ref_head -= nr;
2236 if (ci->i_wrbuffer_ref_head == 0 &&
2237 ci->i_dirty_caps == 0 && ci->i_flushing_caps == 0) {
2238 BUG_ON(!ci->i_head_snapc);
2239 ceph_put_snap_context(ci->i_head_snapc);
2240 ci->i_head_snapc = NULL;
2241 }
2242 dout("put_wrbuffer_cap_refs on %p head %d/%d -> %d/%d %s\n",
2243 inode,
2244 ci->i_wrbuffer_ref+nr, ci->i_wrbuffer_ref_head+nr,
2245 ci->i_wrbuffer_ref, ci->i_wrbuffer_ref_head,
2246 last ? " LAST" : "");
2247 } else {
2248 list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) {
2249 if (capsnap->context == snapc) {
2250 found = 1;
2251 break;
2252 }
2253 }
2254 BUG_ON(!found);
2255 capsnap->dirty_pages -= nr;
2256 if (capsnap->dirty_pages == 0) {
2257 complete_capsnap = 1;
2258 if (capsnap->dirty == 0)
2259 /* cap writeback completed before we created
2260 * the cap_snap; no FLUSHSNAP is needed */
2261 drop_capsnap = 1;
2262 }
2263 dout("put_wrbuffer_cap_refs on %p cap_snap %p "
2264 " snap %lld %d/%d -> %d/%d %s%s%s\n",
2265 inode, capsnap, capsnap->context->seq,
2266 ci->i_wrbuffer_ref+nr, capsnap->dirty_pages + nr,
2267 ci->i_wrbuffer_ref, capsnap->dirty_pages,
2268 last ? " (wrbuffer last)" : "",
2269 complete_capsnap ? " (complete capsnap)" : "",
2270 drop_capsnap ? " (drop capsnap)" : "");
2271 if (drop_capsnap) {
2272 ceph_put_snap_context(capsnap->context);
2273 list_del(&capsnap->ci_item);
2274 list_del(&capsnap->flushing_item);
2275 ceph_put_cap_snap(capsnap);
2276 }
2277 }
2278
2279 spin_unlock(&inode->i_lock);
2280
2281 if (last) {
2282 ceph_check_caps(ci, CHECK_CAPS_AUTHONLY, NULL);
2283 iput(inode);
2284 } else if (complete_capsnap) {
2285 ceph_flush_snaps(ci);
2286 wake_up_all(&ci->i_cap_wq);
2287 }
2288 if (drop_capsnap)
2289 iput(inode);
2290}
2291
2292/*
2293 * Handle a cap GRANT message from the MDS. (Note that a GRANT may
2294 * actually be a revocation if it specifies a smaller cap set.)
2295 *
2296 * caller holds s_mutex and i_lock, we drop both.
2297 *
2298 * return value:
2299 * 0 - ok
2300 * 1 - check_caps on auth cap only (writeback)
2301 * 2 - check_caps (ack revoke)
2302 */
2303static void handle_cap_grant(struct inode *inode, struct ceph_mds_caps *grant,
2304 struct ceph_mds_session *session,
2305 struct ceph_cap *cap,
2306 struct ceph_buffer *xattr_buf)
2307 __releases(inode->i_lock)
2308{
2309 struct ceph_inode_info *ci = ceph_inode(inode);
2310 int mds = session->s_mds;
2311 int seq = le32_to_cpu(grant->seq);
2312 int newcaps = le32_to_cpu(grant->caps);
2313 int issued, implemented, used, wanted, dirty;
2314 u64 size = le64_to_cpu(grant->size);
2315 u64 max_size = le64_to_cpu(grant->max_size);
2316 struct timespec mtime, atime, ctime;
2317 int check_caps = 0;
2318 int wake = 0;
2319 int writeback = 0;
2320 int revoked_rdcache = 0;
2321 int queue_invalidate = 0;
2322
2323 dout("handle_cap_grant inode %p cap %p mds%d seq %d %s\n",
2324 inode, cap, mds, seq, ceph_cap_string(newcaps));
2325 dout(" size %llu max_size %llu, i_size %llu\n", size, max_size,
2326 inode->i_size);
2327
2328 /*
2329 * If CACHE is being revoked, and we have no dirty buffers,
2330 * try to invalidate (once). (If there are dirty buffers, we
2331 * will invalidate _after_ writeback.)
2332 */
2333 if (((cap->issued & ~newcaps) & CEPH_CAP_FILE_CACHE) &&
2334 (newcaps & CEPH_CAP_FILE_LAZYIO) == 0 &&
2335 !ci->i_wrbuffer_ref) {
2336 if (try_nonblocking_invalidate(inode) == 0) {
2337 revoked_rdcache = 1;
2338 } else {
2339 /* there were locked pages.. invalidate later
2340 in a separate thread. */
2341 if (ci->i_rdcache_revoking != ci->i_rdcache_gen) {
2342 queue_invalidate = 1;
2343 ci->i_rdcache_revoking = ci->i_rdcache_gen;
2344 }
2345 }
2346 }
2347
2348 /* side effects now are allowed */
2349
2350 issued = __ceph_caps_issued(ci, &implemented);
2351 issued |= implemented | __ceph_caps_dirty(ci);
2352
2353 cap->cap_gen = session->s_cap_gen;
2354
2355 __check_cap_issue(ci, cap, newcaps);
2356
2357 if ((issued & CEPH_CAP_AUTH_EXCL) == 0) {
2358 inode->i_mode = le32_to_cpu(grant->mode);
2359 inode->i_uid = le32_to_cpu(grant->uid);
2360 inode->i_gid = le32_to_cpu(grant->gid);
2361 dout("%p mode 0%o uid.gid %d.%d\n", inode, inode->i_mode,
2362 inode->i_uid, inode->i_gid);
2363 }
2364
2365 if ((issued & CEPH_CAP_LINK_EXCL) == 0)
2366 inode->i_nlink = le32_to_cpu(grant->nlink);
2367
2368 if ((issued & CEPH_CAP_XATTR_EXCL) == 0 && grant->xattr_len) {
2369 int len = le32_to_cpu(grant->xattr_len);
2370 u64 version = le64_to_cpu(grant->xattr_version);
2371
2372 if (version > ci->i_xattrs.version) {
2373 dout(" got new xattrs v%llu on %p len %d\n",
2374 version, inode, len);
2375 if (ci->i_xattrs.blob)
2376 ceph_buffer_put(ci->i_xattrs.blob);
2377 ci->i_xattrs.blob = ceph_buffer_get(xattr_buf);
2378 ci->i_xattrs.version = version;
2379 }
2380 }
2381
2382 /* size/ctime/mtime/atime? */
2383 ceph_fill_file_size(inode, issued,
2384 le32_to_cpu(grant->truncate_seq),
2385 le64_to_cpu(grant->truncate_size), size);
2386 ceph_decode_timespec(&mtime, &grant->mtime);
2387 ceph_decode_timespec(&atime, &grant->atime);
2388 ceph_decode_timespec(&ctime, &grant->ctime);
2389 ceph_fill_file_time(inode, issued,
2390 le32_to_cpu(grant->time_warp_seq), &ctime, &mtime,
2391 &atime);
2392
2393 /* max size increase? */
2394 if (max_size != ci->i_max_size) {
2395 dout("max_size %lld -> %llu\n", ci->i_max_size, max_size);
2396 ci->i_max_size = max_size;
2397 if (max_size >= ci->i_wanted_max_size) {
2398 ci->i_wanted_max_size = 0; /* reset */
2399 ci->i_requested_max_size = 0;
2400 }
2401 wake = 1;
2402 }
2403
2404 /* check cap bits */
2405 wanted = __ceph_caps_wanted(ci);
2406 used = __ceph_caps_used(ci);
2407 dirty = __ceph_caps_dirty(ci);
2408 dout(" my wanted = %s, used = %s, dirty %s\n",
2409 ceph_cap_string(wanted),
2410 ceph_cap_string(used),
2411 ceph_cap_string(dirty));
2412 if (wanted != le32_to_cpu(grant->wanted)) {
2413 dout("mds wanted %s -> %s\n",
2414 ceph_cap_string(le32_to_cpu(grant->wanted)),
2415 ceph_cap_string(wanted));
2416 grant->wanted = cpu_to_le32(wanted);
2417 }
2418
2419 cap->seq = seq;
2420
2421 /* file layout may have changed */
2422 ci->i_layout = grant->layout;
2423
2424 /* revocation, grant, or no-op? */
2425 if (cap->issued & ~newcaps) {
2426 int revoking = cap->issued & ~newcaps;
2427
2428 dout("revocation: %s -> %s (revoking %s)\n",
2429 ceph_cap_string(cap->issued),
2430 ceph_cap_string(newcaps),
2431 ceph_cap_string(revoking));
2432 if (revoking & used & CEPH_CAP_FILE_BUFFER)
2433 writeback = 1; /* initiate writeback; will delay ack */
2434 else if (revoking == CEPH_CAP_FILE_CACHE &&
2435 (newcaps & CEPH_CAP_FILE_LAZYIO) == 0 &&
2436 queue_invalidate)
2437 ; /* do nothing yet, invalidation will be queued */
2438 else if (cap == ci->i_auth_cap)
2439 check_caps = 1; /* check auth cap only */
2440 else
2441 check_caps = 2; /* check all caps */
2442 cap->issued = newcaps;
2443 cap->implemented |= newcaps;
2444 } else if (cap->issued == newcaps) {
2445 dout("caps unchanged: %s -> %s\n",
2446 ceph_cap_string(cap->issued), ceph_cap_string(newcaps));
2447 } else {
2448 dout("grant: %s -> %s\n", ceph_cap_string(cap->issued),
2449 ceph_cap_string(newcaps));
2450 cap->issued = newcaps;
2451 cap->implemented |= newcaps; /* add bits only, to
2452 * avoid stepping on a
2453 * pending revocation */
2454 wake = 1;
2455 }
2456 BUG_ON(cap->issued & ~cap->implemented);
2457
2458 spin_unlock(&inode->i_lock);
2459 if (writeback)
2460 /*
2461 * queue inode for writeback: we can't actually call
2462 * filemap_write_and_wait, etc. from message handler
2463 * context.
2464 */
2465 ceph_queue_writeback(inode);
2466 if (queue_invalidate)
2467 ceph_queue_invalidate(inode);
2468 if (wake)
2469 wake_up_all(&ci->i_cap_wq);
2470
2471 if (check_caps == 1)
2472 ceph_check_caps(ci, CHECK_CAPS_NODELAY|CHECK_CAPS_AUTHONLY,
2473 session);
2474 else if (check_caps == 2)
2475 ceph_check_caps(ci, CHECK_CAPS_NODELAY, session);
2476 else
2477 mutex_unlock(&session->s_mutex);
2478}
2479
2480/*
2481 * Handle FLUSH_ACK from MDS, indicating that metadata we sent to the
2482 * MDS has been safely committed.
2483 */
2484static void handle_cap_flush_ack(struct inode *inode, u64 flush_tid,
2485 struct ceph_mds_caps *m,
2486 struct ceph_mds_session *session,
2487 struct ceph_cap *cap)
2488 __releases(inode->i_lock)
2489{
2490 struct ceph_inode_info *ci = ceph_inode(inode);
2491 struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
2492 unsigned seq = le32_to_cpu(m->seq);
2493 int dirty = le32_to_cpu(m->dirty);
2494 int cleaned = 0;
2495 int drop = 0;
2496 int i;
2497
2498 for (i = 0; i < CEPH_CAP_BITS; i++)
2499 if ((dirty & (1 << i)) &&
2500 flush_tid == ci->i_cap_flush_tid[i])
2501 cleaned |= 1 << i;
2502
2503 dout("handle_cap_flush_ack inode %p mds%d seq %d on %s cleaned %s,"
2504 " flushing %s -> %s\n",
2505 inode, session->s_mds, seq, ceph_cap_string(dirty),
2506 ceph_cap_string(cleaned), ceph_cap_string(ci->i_flushing_caps),
2507 ceph_cap_string(ci->i_flushing_caps & ~cleaned));
2508
2509 if (ci->i_flushing_caps == (ci->i_flushing_caps & ~cleaned))
2510 goto out;
2511
2512 ci->i_flushing_caps &= ~cleaned;
2513
2514 spin_lock(&mdsc->cap_dirty_lock);
2515 if (ci->i_flushing_caps == 0) {
2516 list_del_init(&ci->i_flushing_item);
2517 if (!list_empty(&session->s_cap_flushing))
2518 dout(" mds%d still flushing cap on %p\n",
2519 session->s_mds,
2520 &list_entry(session->s_cap_flushing.next,
2521 struct ceph_inode_info,
2522 i_flushing_item)->vfs_inode);
2523 mdsc->num_cap_flushing--;
2524 wake_up_all(&mdsc->cap_flushing_wq);
2525 dout(" inode %p now !flushing\n", inode);
2526
2527 if (ci->i_dirty_caps == 0) {
2528 dout(" inode %p now clean\n", inode);
2529 BUG_ON(!list_empty(&ci->i_dirty_item));
2530 drop = 1;
2531 if (ci->i_wrbuffer_ref_head == 0) {
2532 BUG_ON(!ci->i_head_snapc);
2533 ceph_put_snap_context(ci->i_head_snapc);
2534 ci->i_head_snapc = NULL;
2535 }
2536 } else {
2537 BUG_ON(list_empty(&ci->i_dirty_item));
2538 }
2539 }
2540 spin_unlock(&mdsc->cap_dirty_lock);
2541 wake_up_all(&ci->i_cap_wq);
2542
2543out:
2544 spin_unlock(&inode->i_lock);
2545 if (drop)
2546 iput(inode);
2547}
2548
2549/*
2550 * Handle FLUSHSNAP_ACK. MDS has flushed snap data to disk and we can
2551 * throw away our cap_snap.
2552 *
2553 * Caller hold s_mutex.
2554 */
2555static void handle_cap_flushsnap_ack(struct inode *inode, u64 flush_tid,
2556 struct ceph_mds_caps *m,
2557 struct ceph_mds_session *session)
2558{
2559 struct ceph_inode_info *ci = ceph_inode(inode);
2560 u64 follows = le64_to_cpu(m->snap_follows);
2561 struct ceph_cap_snap *capsnap;
2562 int drop = 0;
2563
2564 dout("handle_cap_flushsnap_ack inode %p ci %p mds%d follows %lld\n",
2565 inode, ci, session->s_mds, follows);
2566
2567 spin_lock(&inode->i_lock);
2568 list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) {
2569 if (capsnap->follows == follows) {
2570 if (capsnap->flush_tid != flush_tid) {
2571 dout(" cap_snap %p follows %lld tid %lld !="
2572 " %lld\n", capsnap, follows,
2573 flush_tid, capsnap->flush_tid);
2574 break;
2575 }
2576 WARN_ON(capsnap->dirty_pages || capsnap->writing);
2577 dout(" removing %p cap_snap %p follows %lld\n",
2578 inode, capsnap, follows);
2579 ceph_put_snap_context(capsnap->context);
2580 list_del(&capsnap->ci_item);
2581 list_del(&capsnap->flushing_item);
2582 ceph_put_cap_snap(capsnap);
2583 drop = 1;
2584 break;
2585 } else {
2586 dout(" skipping cap_snap %p follows %lld\n",
2587 capsnap, capsnap->follows);
2588 }
2589 }
2590 spin_unlock(&inode->i_lock);
2591 if (drop)
2592 iput(inode);
2593}
2594
2595/*
2596 * Handle TRUNC from MDS, indicating file truncation.
2597 *
2598 * caller hold s_mutex.
2599 */
2600static void handle_cap_trunc(struct inode *inode,
2601 struct ceph_mds_caps *trunc,
2602 struct ceph_mds_session *session)
2603 __releases(inode->i_lock)
2604{
2605 struct ceph_inode_info *ci = ceph_inode(inode);
2606 int mds = session->s_mds;
2607 int seq = le32_to_cpu(trunc->seq);
2608 u32 truncate_seq = le32_to_cpu(trunc->truncate_seq);
2609 u64 truncate_size = le64_to_cpu(trunc->truncate_size);
2610 u64 size = le64_to_cpu(trunc->size);
2611 int implemented = 0;
2612 int dirty = __ceph_caps_dirty(ci);
2613 int issued = __ceph_caps_issued(ceph_inode(inode), &implemented);
2614 int queue_trunc = 0;
2615
2616 issued |= implemented | dirty;
2617
2618 dout("handle_cap_trunc inode %p mds%d seq %d to %lld seq %d\n",
2619 inode, mds, seq, truncate_size, truncate_seq);
2620 queue_trunc = ceph_fill_file_size(inode, issued,
2621 truncate_seq, truncate_size, size);
2622 spin_unlock(&inode->i_lock);
2623
2624 if (queue_trunc)
2625 ceph_queue_vmtruncate(inode);
2626}
2627
2628/*
2629 * Handle EXPORT from MDS. Cap is being migrated _from_ this mds to a
2630 * different one. If we are the most recent migration we've seen (as
2631 * indicated by mseq), make note of the migrating cap bits for the
2632 * duration (until we see the corresponding IMPORT).
2633 *
2634 * caller holds s_mutex
2635 */
2636static void handle_cap_export(struct inode *inode, struct ceph_mds_caps *ex,
2637 struct ceph_mds_session *session,
2638 int *open_target_sessions)
2639{
2640 struct ceph_mds_client *mdsc = ceph_inode_to_client(inode)->mdsc;
2641 struct ceph_inode_info *ci = ceph_inode(inode);
2642 int mds = session->s_mds;
2643 unsigned mseq = le32_to_cpu(ex->migrate_seq);
2644 struct ceph_cap *cap = NULL, *t;
2645 struct rb_node *p;
2646 int remember = 1;
2647
2648 dout("handle_cap_export inode %p ci %p mds%d mseq %d\n",
2649 inode, ci, mds, mseq);
2650
2651 spin_lock(&inode->i_lock);
2652
2653 /* make sure we haven't seen a higher mseq */
2654 for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
2655 t = rb_entry(p, struct ceph_cap, ci_node);
2656 if (ceph_seq_cmp(t->mseq, mseq) > 0) {
2657 dout(" higher mseq on cap from mds%d\n",
2658 t->session->s_mds);
2659 remember = 0;
2660 }
2661 if (t->session->s_mds == mds)
2662 cap = t;
2663 }
2664
2665 if (cap) {
2666 if (remember) {
2667 /* make note */
2668 ci->i_cap_exporting_mds = mds;
2669 ci->i_cap_exporting_mseq = mseq;
2670 ci->i_cap_exporting_issued = cap->issued;
2671
2672 /*
2673 * make sure we have open sessions with all possible
2674 * export targets, so that we get the matching IMPORT
2675 */
2676 *open_target_sessions = 1;
2677
2678 /*
2679 * we can't flush dirty caps that we've seen the
2680 * EXPORT but no IMPORT for
2681 */
2682 spin_lock(&mdsc->cap_dirty_lock);
2683 if (!list_empty(&ci->i_dirty_item)) {
2684 dout(" moving %p to cap_dirty_migrating\n",
2685 inode);
2686 list_move(&ci->i_dirty_item,
2687 &mdsc->cap_dirty_migrating);
2688 }
2689 spin_unlock(&mdsc->cap_dirty_lock);
2690 }
2691 __ceph_remove_cap(cap);
2692 }
2693 /* else, we already released it */
2694
2695 spin_unlock(&inode->i_lock);
2696}
2697
2698/*
2699 * Handle cap IMPORT. If there are temp bits from an older EXPORT,
2700 * clean them up.
2701 *
2702 * caller holds s_mutex.
2703 */
2704static void handle_cap_import(struct ceph_mds_client *mdsc,
2705 struct inode *inode, struct ceph_mds_caps *im,
2706 struct ceph_mds_session *session,
2707 void *snaptrace, int snaptrace_len)
2708{
2709 struct ceph_inode_info *ci = ceph_inode(inode);
2710 int mds = session->s_mds;
2711 unsigned issued = le32_to_cpu(im->caps);
2712 unsigned wanted = le32_to_cpu(im->wanted);
2713 unsigned seq = le32_to_cpu(im->seq);
2714 unsigned mseq = le32_to_cpu(im->migrate_seq);
2715 u64 realmino = le64_to_cpu(im->realm);
2716 u64 cap_id = le64_to_cpu(im->cap_id);
2717
2718 if (ci->i_cap_exporting_mds >= 0 &&
2719 ceph_seq_cmp(ci->i_cap_exporting_mseq, mseq) < 0) {
2720 dout("handle_cap_import inode %p ci %p mds%d mseq %d"
2721 " - cleared exporting from mds%d\n",
2722 inode, ci, mds, mseq,
2723 ci->i_cap_exporting_mds);
2724 ci->i_cap_exporting_issued = 0;
2725 ci->i_cap_exporting_mseq = 0;
2726 ci->i_cap_exporting_mds = -1;
2727
2728 spin_lock(&mdsc->cap_dirty_lock);
2729 if (!list_empty(&ci->i_dirty_item)) {
2730 dout(" moving %p back to cap_dirty\n", inode);
2731 list_move(&ci->i_dirty_item, &mdsc->cap_dirty);
2732 }
2733 spin_unlock(&mdsc->cap_dirty_lock);
2734 } else {
2735 dout("handle_cap_import inode %p ci %p mds%d mseq %d\n",
2736 inode, ci, mds, mseq);
2737 }
2738
2739 down_write(&mdsc->snap_rwsem);
2740 ceph_update_snap_trace(mdsc, snaptrace, snaptrace+snaptrace_len,
2741 false);
2742 downgrade_write(&mdsc->snap_rwsem);
2743 ceph_add_cap(inode, session, cap_id, -1,
2744 issued, wanted, seq, mseq, realmino, CEPH_CAP_FLAG_AUTH,
2745 NULL /* no caps context */);
2746 kick_flushing_inode_caps(mdsc, session, inode);
2747 up_read(&mdsc->snap_rwsem);
2748
2749 /* make sure we re-request max_size, if necessary */
2750 spin_lock(&inode->i_lock);
2751 ci->i_requested_max_size = 0;
2752 spin_unlock(&inode->i_lock);
2753}
2754
2755/*
2756 * Handle a caps message from the MDS.
2757 *
2758 * Identify the appropriate session, inode, and call the right handler
2759 * based on the cap op.
2760 */
2761void ceph_handle_caps(struct ceph_mds_session *session,
2762 struct ceph_msg *msg)
2763{
2764 struct ceph_mds_client *mdsc = session->s_mdsc;
2765 struct super_block *sb = mdsc->fsc->sb;
2766 struct inode *inode;
2767 struct ceph_cap *cap;
2768 struct ceph_mds_caps *h;
2769 int mds = session->s_mds;
2770 int op;
2771 u32 seq, mseq;
2772 struct ceph_vino vino;
2773 u64 cap_id;
2774 u64 size, max_size;
2775 u64 tid;
2776 void *snaptrace;
2777 size_t snaptrace_len;
2778 void *flock;
2779 u32 flock_len;
2780 int open_target_sessions = 0;
2781
2782 dout("handle_caps from mds%d\n", mds);
2783
2784 /* decode */
2785 tid = le64_to_cpu(msg->hdr.tid);
2786 if (msg->front.iov_len < sizeof(*h))
2787 goto bad;
2788 h = msg->front.iov_base;
2789 op = le32_to_cpu(h->op);
2790 vino.ino = le64_to_cpu(h->ino);
2791 vino.snap = CEPH_NOSNAP;
2792 cap_id = le64_to_cpu(h->cap_id);
2793 seq = le32_to_cpu(h->seq);
2794 mseq = le32_to_cpu(h->migrate_seq);
2795 size = le64_to_cpu(h->size);
2796 max_size = le64_to_cpu(h->max_size);
2797
2798 snaptrace = h + 1;
2799 snaptrace_len = le32_to_cpu(h->snap_trace_len);
2800
2801 if (le16_to_cpu(msg->hdr.version) >= 2) {
2802 void *p, *end;
2803
2804 p = snaptrace + snaptrace_len;
2805 end = msg->front.iov_base + msg->front.iov_len;
2806 ceph_decode_32_safe(&p, end, flock_len, bad);
2807 flock = p;
2808 } else {
2809 flock = NULL;
2810 flock_len = 0;
2811 }
2812
2813 mutex_lock(&session->s_mutex);
2814 session->s_seq++;
2815 dout(" mds%d seq %lld cap seq %u\n", session->s_mds, session->s_seq,
2816 (unsigned)seq);
2817
2818 /* lookup ino */
2819 inode = ceph_find_inode(sb, vino);
2820 dout(" op %s ino %llx.%llx inode %p\n", ceph_cap_op_name(op), vino.ino,
2821 vino.snap, inode);
2822 if (!inode) {
2823 dout(" i don't have ino %llx\n", vino.ino);
2824
2825 if (op == CEPH_CAP_OP_IMPORT)
2826 __queue_cap_release(session, vino.ino, cap_id,
2827 mseq, seq);
2828 goto flush_cap_releases;
2829 }
2830
2831 /* these will work even if we don't have a cap yet */
2832 switch (op) {
2833 case CEPH_CAP_OP_FLUSHSNAP_ACK:
2834 handle_cap_flushsnap_ack(inode, tid, h, session);
2835 goto done;
2836
2837 case CEPH_CAP_OP_EXPORT:
2838 handle_cap_export(inode, h, session, &open_target_sessions);
2839 goto done;
2840
2841 case CEPH_CAP_OP_IMPORT:
2842 handle_cap_import(mdsc, inode, h, session,
2843 snaptrace, snaptrace_len);
2844 ceph_check_caps(ceph_inode(inode), 0, session);
2845 goto done_unlocked;
2846 }
2847
2848 /* the rest require a cap */
2849 spin_lock(&inode->i_lock);
2850 cap = __get_cap_for_mds(ceph_inode(inode), mds);
2851 if (!cap) {
2852 dout(" no cap on %p ino %llx.%llx from mds%d\n",
2853 inode, ceph_ino(inode), ceph_snap(inode), mds);
2854 spin_unlock(&inode->i_lock);
2855 goto flush_cap_releases;
2856 }
2857
2858 /* note that each of these drops i_lock for us */
2859 switch (op) {
2860 case CEPH_CAP_OP_REVOKE:
2861 case CEPH_CAP_OP_GRANT:
2862 handle_cap_grant(inode, h, session, cap, msg->middle);
2863 goto done_unlocked;
2864
2865 case CEPH_CAP_OP_FLUSH_ACK:
2866 handle_cap_flush_ack(inode, tid, h, session, cap);
2867 break;
2868
2869 case CEPH_CAP_OP_TRUNC:
2870 handle_cap_trunc(inode, h, session);
2871 break;
2872
2873 default:
2874 spin_unlock(&inode->i_lock);
2875 pr_err("ceph_handle_caps: unknown cap op %d %s\n", op,
2876 ceph_cap_op_name(op));
2877 }
2878
2879 goto done;
2880
2881flush_cap_releases:
2882 /*
2883 * send any full release message to try to move things
2884 * along for the mds (who clearly thinks we still have this
2885 * cap).
2886 */
2887 ceph_add_cap_releases(mdsc, session);
2888 ceph_send_cap_releases(mdsc, session);
2889
2890done:
2891 mutex_unlock(&session->s_mutex);
2892done_unlocked:
2893 if (inode)
2894 iput(inode);
2895 if (open_target_sessions)
2896 ceph_mdsc_open_export_target_sessions(mdsc, session);
2897 return;
2898
2899bad:
2900 pr_err("ceph_handle_caps: corrupt message\n");
2901 ceph_msg_dump(msg);
2902 return;
2903}
2904
2905/*
2906 * Delayed work handler to process end of delayed cap release LRU list.
2907 */
2908void ceph_check_delayed_caps(struct ceph_mds_client *mdsc)
2909{
2910 struct ceph_inode_info *ci;
2911 int flags = CHECK_CAPS_NODELAY;
2912
2913 dout("check_delayed_caps\n");
2914 while (1) {
2915 spin_lock(&mdsc->cap_delay_lock);
2916 if (list_empty(&mdsc->cap_delay_list))
2917 break;
2918 ci = list_first_entry(&mdsc->cap_delay_list,
2919 struct ceph_inode_info,
2920 i_cap_delay_list);
2921 if ((ci->i_ceph_flags & CEPH_I_FLUSH) == 0 &&
2922 time_before(jiffies, ci->i_hold_caps_max))
2923 break;
2924 list_del_init(&ci->i_cap_delay_list);
2925 spin_unlock(&mdsc->cap_delay_lock);
2926 dout("check_delayed_caps on %p\n", &ci->vfs_inode);
2927 ceph_check_caps(ci, flags, NULL);
2928 }
2929 spin_unlock(&mdsc->cap_delay_lock);
2930}
2931
2932/*
2933 * Flush all dirty caps to the mds
2934 */
2935void ceph_flush_dirty_caps(struct ceph_mds_client *mdsc)
2936{
2937 struct ceph_inode_info *ci;
2938 struct inode *inode;
2939
2940 dout("flush_dirty_caps\n");
2941 spin_lock(&mdsc->cap_dirty_lock);
2942 while (!list_empty(&mdsc->cap_dirty)) {
2943 ci = list_first_entry(&mdsc->cap_dirty, struct ceph_inode_info,
2944 i_dirty_item);
2945 inode = &ci->vfs_inode;
2946 ihold(inode);
2947 dout("flush_dirty_caps %p\n", inode);
2948 spin_unlock(&mdsc->cap_dirty_lock);
2949 ceph_check_caps(ci, CHECK_CAPS_NODELAY|CHECK_CAPS_FLUSH, NULL);
2950 iput(inode);
2951 spin_lock(&mdsc->cap_dirty_lock);
2952 }
2953 spin_unlock(&mdsc->cap_dirty_lock);
2954 dout("flush_dirty_caps done\n");
2955}
2956
2957/*
2958 * Drop open file reference. If we were the last open file,
2959 * we may need to release capabilities to the MDS (or schedule
2960 * their delayed release).
2961 */
2962void ceph_put_fmode(struct ceph_inode_info *ci, int fmode)
2963{
2964 struct inode *inode = &ci->vfs_inode;
2965 int last = 0;
2966
2967 spin_lock(&inode->i_lock);
2968 dout("put_fmode %p fmode %d %d -> %d\n", inode, fmode,
2969 ci->i_nr_by_mode[fmode], ci->i_nr_by_mode[fmode]-1);
2970 BUG_ON(ci->i_nr_by_mode[fmode] == 0);
2971 if (--ci->i_nr_by_mode[fmode] == 0)
2972 last++;
2973 spin_unlock(&inode->i_lock);
2974
2975 if (last && ci->i_vino.snap == CEPH_NOSNAP)
2976 ceph_check_caps(ci, 0, NULL);
2977}
2978
2979/*
2980 * Helpers for embedding cap and dentry lease releases into mds
2981 * requests.
2982 *
2983 * @force is used by dentry_release (below) to force inclusion of a
2984 * record for the directory inode, even when there aren't any caps to
2985 * drop.
2986 */
2987int ceph_encode_inode_release(void **p, struct inode *inode,
2988 int mds, int drop, int unless, int force)
2989{
2990 struct ceph_inode_info *ci = ceph_inode(inode);
2991 struct ceph_cap *cap;
2992 struct ceph_mds_request_release *rel = *p;
2993 int used, dirty;
2994 int ret = 0;
2995
2996 spin_lock(&inode->i_lock);
2997 used = __ceph_caps_used(ci);
2998 dirty = __ceph_caps_dirty(ci);
2999
3000 dout("encode_inode_release %p mds%d used|dirty %s drop %s unless %s\n",
3001 inode, mds, ceph_cap_string(used|dirty), ceph_cap_string(drop),
3002 ceph_cap_string(unless));
3003
3004 /* only drop unused, clean caps */
3005 drop &= ~(used | dirty);
3006
3007 cap = __get_cap_for_mds(ci, mds);
3008 if (cap && __cap_is_valid(cap)) {
3009 if (force ||
3010 ((cap->issued & drop) &&
3011 (cap->issued & unless) == 0)) {
3012 if ((cap->issued & drop) &&
3013 (cap->issued & unless) == 0) {
3014 dout("encode_inode_release %p cap %p %s -> "
3015 "%s\n", inode, cap,
3016 ceph_cap_string(cap->issued),
3017 ceph_cap_string(cap->issued & ~drop));
3018 cap->issued &= ~drop;
3019 cap->implemented &= ~drop;
3020 if (ci->i_ceph_flags & CEPH_I_NODELAY) {
3021 int wanted = __ceph_caps_wanted(ci);
3022 dout(" wanted %s -> %s (act %s)\n",
3023 ceph_cap_string(cap->mds_wanted),
3024 ceph_cap_string(cap->mds_wanted &
3025 ~wanted),
3026 ceph_cap_string(wanted));
3027 cap->mds_wanted &= wanted;
3028 }
3029 } else {
3030 dout("encode_inode_release %p cap %p %s"
3031 " (force)\n", inode, cap,
3032 ceph_cap_string(cap->issued));
3033 }
3034
3035 rel->ino = cpu_to_le64(ceph_ino(inode));
3036 rel->cap_id = cpu_to_le64(cap->cap_id);
3037 rel->seq = cpu_to_le32(cap->seq);
3038 rel->issue_seq = cpu_to_le32(cap->issue_seq),
3039 rel->mseq = cpu_to_le32(cap->mseq);
3040 rel->caps = cpu_to_le32(cap->issued);
3041 rel->wanted = cpu_to_le32(cap->mds_wanted);
3042 rel->dname_len = 0;
3043 rel->dname_seq = 0;
3044 *p += sizeof(*rel);
3045 ret = 1;
3046 } else {
3047 dout("encode_inode_release %p cap %p %s\n",
3048 inode, cap, ceph_cap_string(cap->issued));
3049 }
3050 }
3051 spin_unlock(&inode->i_lock);
3052 return ret;
3053}
3054
3055int ceph_encode_dentry_release(void **p, struct dentry *dentry,
3056 int mds, int drop, int unless)
3057{
3058 struct inode *dir = dentry->d_parent->d_inode;
3059 struct ceph_mds_request_release *rel = *p;
3060 struct ceph_dentry_info *di = ceph_dentry(dentry);
3061 int force = 0;
3062 int ret;
3063
3064 /*
3065 * force an record for the directory caps if we have a dentry lease.
3066 * this is racy (can't take i_lock and d_lock together), but it
3067 * doesn't have to be perfect; the mds will revoke anything we don't
3068 * release.
3069 */
3070 spin_lock(&dentry->d_lock);
3071 if (di->lease_session && di->lease_session->s_mds == mds)
3072 force = 1;
3073 spin_unlock(&dentry->d_lock);
3074
3075 ret = ceph_encode_inode_release(p, dir, mds, drop, unless, force);
3076
3077 spin_lock(&dentry->d_lock);
3078 if (ret && di->lease_session && di->lease_session->s_mds == mds) {
3079 dout("encode_dentry_release %p mds%d seq %d\n",
3080 dentry, mds, (int)di->lease_seq);
3081 rel->dname_len = cpu_to_le32(dentry->d_name.len);
3082 memcpy(*p, dentry->d_name.name, dentry->d_name.len);
3083 *p += dentry->d_name.len;
3084 rel->dname_seq = cpu_to_le32(di->lease_seq);
3085 __ceph_mdsc_drop_dentry_lease(dentry);
3086 }
3087 spin_unlock(&dentry->d_lock);
3088 return ret;
3089}
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#include <linux/filelock.h>
13#include <linux/jiffies.h>
14
15#include "super.h"
16#include "mds_client.h"
17#include "cache.h"
18#include "crypto.h"
19#include <linux/ceph/decode.h>
20#include <linux/ceph/messenger.h>
21
22/*
23 * Capability management
24 *
25 * The Ceph metadata servers control client access to inode metadata
26 * and file data by issuing capabilities, granting clients permission
27 * to read and/or write both inode field and file data to OSDs
28 * (storage nodes). Each capability consists of a set of bits
29 * indicating which operations are allowed.
30 *
31 * If the client holds a *_SHARED cap, the client has a coherent value
32 * that can be safely read from the cached inode.
33 *
34 * In the case of a *_EXCL (exclusive) or FILE_WR capabilities, the
35 * client is allowed to change inode attributes (e.g., file size,
36 * mtime), note its dirty state in the ceph_cap, and asynchronously
37 * flush that metadata change to the MDS.
38 *
39 * In the event of a conflicting operation (perhaps by another
40 * client), the MDS will revoke the conflicting client capabilities.
41 *
42 * In order for a client to cache an inode, it must hold a capability
43 * with at least one MDS server. When inodes are released, release
44 * notifications are batched and periodically sent en masse to the MDS
45 * cluster to release server state.
46 */
47
48static u64 __get_oldest_flush_tid(struct ceph_mds_client *mdsc);
49static void __kick_flushing_caps(struct ceph_mds_client *mdsc,
50 struct ceph_mds_session *session,
51 struct ceph_inode_info *ci,
52 u64 oldest_flush_tid);
53
54/*
55 * Generate readable cap strings for debugging output.
56 */
57#define MAX_CAP_STR 20
58static char cap_str[MAX_CAP_STR][40];
59static DEFINE_SPINLOCK(cap_str_lock);
60static int last_cap_str;
61
62static char *gcap_string(char *s, int c)
63{
64 if (c & CEPH_CAP_GSHARED)
65 *s++ = 's';
66 if (c & CEPH_CAP_GEXCL)
67 *s++ = 'x';
68 if (c & CEPH_CAP_GCACHE)
69 *s++ = 'c';
70 if (c & CEPH_CAP_GRD)
71 *s++ = 'r';
72 if (c & CEPH_CAP_GWR)
73 *s++ = 'w';
74 if (c & CEPH_CAP_GBUFFER)
75 *s++ = 'b';
76 if (c & CEPH_CAP_GWREXTEND)
77 *s++ = 'a';
78 if (c & CEPH_CAP_GLAZYIO)
79 *s++ = 'l';
80 return s;
81}
82
83const char *ceph_cap_string(int caps)
84{
85 int i;
86 char *s;
87 int c;
88
89 spin_lock(&cap_str_lock);
90 i = last_cap_str++;
91 if (last_cap_str == MAX_CAP_STR)
92 last_cap_str = 0;
93 spin_unlock(&cap_str_lock);
94
95 s = cap_str[i];
96
97 if (caps & CEPH_CAP_PIN)
98 *s++ = 'p';
99
100 c = (caps >> CEPH_CAP_SAUTH) & 3;
101 if (c) {
102 *s++ = 'A';
103 s = gcap_string(s, c);
104 }
105
106 c = (caps >> CEPH_CAP_SLINK) & 3;
107 if (c) {
108 *s++ = 'L';
109 s = gcap_string(s, c);
110 }
111
112 c = (caps >> CEPH_CAP_SXATTR) & 3;
113 if (c) {
114 *s++ = 'X';
115 s = gcap_string(s, c);
116 }
117
118 c = caps >> CEPH_CAP_SFILE;
119 if (c) {
120 *s++ = 'F';
121 s = gcap_string(s, c);
122 }
123
124 if (s == cap_str[i])
125 *s++ = '-';
126 *s = 0;
127 return cap_str[i];
128}
129
130void ceph_caps_init(struct ceph_mds_client *mdsc)
131{
132 INIT_LIST_HEAD(&mdsc->caps_list);
133 spin_lock_init(&mdsc->caps_list_lock);
134}
135
136void ceph_caps_finalize(struct ceph_mds_client *mdsc)
137{
138 struct ceph_cap *cap;
139
140 spin_lock(&mdsc->caps_list_lock);
141 while (!list_empty(&mdsc->caps_list)) {
142 cap = list_first_entry(&mdsc->caps_list,
143 struct ceph_cap, caps_item);
144 list_del(&cap->caps_item);
145 kmem_cache_free(ceph_cap_cachep, cap);
146 }
147 mdsc->caps_total_count = 0;
148 mdsc->caps_avail_count = 0;
149 mdsc->caps_use_count = 0;
150 mdsc->caps_reserve_count = 0;
151 mdsc->caps_min_count = 0;
152 spin_unlock(&mdsc->caps_list_lock);
153}
154
155void ceph_adjust_caps_max_min(struct ceph_mds_client *mdsc,
156 struct ceph_mount_options *fsopt)
157{
158 spin_lock(&mdsc->caps_list_lock);
159 mdsc->caps_min_count = fsopt->max_readdir;
160 if (mdsc->caps_min_count < 1024)
161 mdsc->caps_min_count = 1024;
162 mdsc->caps_use_max = fsopt->caps_max;
163 if (mdsc->caps_use_max > 0 &&
164 mdsc->caps_use_max < mdsc->caps_min_count)
165 mdsc->caps_use_max = mdsc->caps_min_count;
166 spin_unlock(&mdsc->caps_list_lock);
167}
168
169static void __ceph_unreserve_caps(struct ceph_mds_client *mdsc, int nr_caps)
170{
171 struct ceph_cap *cap;
172 int i;
173
174 if (nr_caps) {
175 BUG_ON(mdsc->caps_reserve_count < nr_caps);
176 mdsc->caps_reserve_count -= nr_caps;
177 if (mdsc->caps_avail_count >=
178 mdsc->caps_reserve_count + mdsc->caps_min_count) {
179 mdsc->caps_total_count -= nr_caps;
180 for (i = 0; i < nr_caps; i++) {
181 cap = list_first_entry(&mdsc->caps_list,
182 struct ceph_cap, caps_item);
183 list_del(&cap->caps_item);
184 kmem_cache_free(ceph_cap_cachep, cap);
185 }
186 } else {
187 mdsc->caps_avail_count += nr_caps;
188 }
189
190 doutc(mdsc->fsc->client,
191 "caps %d = %d used + %d resv + %d avail\n",
192 mdsc->caps_total_count, mdsc->caps_use_count,
193 mdsc->caps_reserve_count, mdsc->caps_avail_count);
194 BUG_ON(mdsc->caps_total_count != mdsc->caps_use_count +
195 mdsc->caps_reserve_count +
196 mdsc->caps_avail_count);
197 }
198}
199
200/*
201 * Called under mdsc->mutex.
202 */
203int ceph_reserve_caps(struct ceph_mds_client *mdsc,
204 struct ceph_cap_reservation *ctx, int need)
205{
206 struct ceph_client *cl = mdsc->fsc->client;
207 int i, j;
208 struct ceph_cap *cap;
209 int have;
210 int alloc = 0;
211 int max_caps;
212 int err = 0;
213 bool trimmed = false;
214 struct ceph_mds_session *s;
215 LIST_HEAD(newcaps);
216
217 doutc(cl, "ctx=%p need=%d\n", ctx, need);
218
219 /* first reserve any caps that are already allocated */
220 spin_lock(&mdsc->caps_list_lock);
221 if (mdsc->caps_avail_count >= need)
222 have = need;
223 else
224 have = mdsc->caps_avail_count;
225 mdsc->caps_avail_count -= have;
226 mdsc->caps_reserve_count += have;
227 BUG_ON(mdsc->caps_total_count != mdsc->caps_use_count +
228 mdsc->caps_reserve_count +
229 mdsc->caps_avail_count);
230 spin_unlock(&mdsc->caps_list_lock);
231
232 for (i = have; i < need; ) {
233 cap = kmem_cache_alloc(ceph_cap_cachep, GFP_NOFS);
234 if (cap) {
235 list_add(&cap->caps_item, &newcaps);
236 alloc++;
237 i++;
238 continue;
239 }
240
241 if (!trimmed) {
242 for (j = 0; j < mdsc->max_sessions; j++) {
243 s = __ceph_lookup_mds_session(mdsc, j);
244 if (!s)
245 continue;
246 mutex_unlock(&mdsc->mutex);
247
248 mutex_lock(&s->s_mutex);
249 max_caps = s->s_nr_caps - (need - i);
250 ceph_trim_caps(mdsc, s, max_caps);
251 mutex_unlock(&s->s_mutex);
252
253 ceph_put_mds_session(s);
254 mutex_lock(&mdsc->mutex);
255 }
256 trimmed = true;
257
258 spin_lock(&mdsc->caps_list_lock);
259 if (mdsc->caps_avail_count) {
260 int more_have;
261 if (mdsc->caps_avail_count >= need - i)
262 more_have = need - i;
263 else
264 more_have = mdsc->caps_avail_count;
265
266 i += more_have;
267 have += more_have;
268 mdsc->caps_avail_count -= more_have;
269 mdsc->caps_reserve_count += more_have;
270
271 }
272 spin_unlock(&mdsc->caps_list_lock);
273
274 continue;
275 }
276
277 pr_warn_client(cl, "ctx=%p ENOMEM need=%d got=%d\n", ctx, need,
278 have + alloc);
279 err = -ENOMEM;
280 break;
281 }
282
283 if (!err) {
284 BUG_ON(have + alloc != need);
285 ctx->count = need;
286 ctx->used = 0;
287 }
288
289 spin_lock(&mdsc->caps_list_lock);
290 mdsc->caps_total_count += alloc;
291 mdsc->caps_reserve_count += alloc;
292 list_splice(&newcaps, &mdsc->caps_list);
293
294 BUG_ON(mdsc->caps_total_count != mdsc->caps_use_count +
295 mdsc->caps_reserve_count +
296 mdsc->caps_avail_count);
297
298 if (err)
299 __ceph_unreserve_caps(mdsc, have + alloc);
300
301 spin_unlock(&mdsc->caps_list_lock);
302
303 doutc(cl, "ctx=%p %d = %d used + %d resv + %d avail\n", ctx,
304 mdsc->caps_total_count, mdsc->caps_use_count,
305 mdsc->caps_reserve_count, mdsc->caps_avail_count);
306 return err;
307}
308
309void ceph_unreserve_caps(struct ceph_mds_client *mdsc,
310 struct ceph_cap_reservation *ctx)
311{
312 struct ceph_client *cl = mdsc->fsc->client;
313 bool reclaim = false;
314 if (!ctx->count)
315 return;
316
317 doutc(cl, "ctx=%p count=%d\n", ctx, ctx->count);
318 spin_lock(&mdsc->caps_list_lock);
319 __ceph_unreserve_caps(mdsc, ctx->count);
320 ctx->count = 0;
321
322 if (mdsc->caps_use_max > 0 &&
323 mdsc->caps_use_count > mdsc->caps_use_max)
324 reclaim = true;
325 spin_unlock(&mdsc->caps_list_lock);
326
327 if (reclaim)
328 ceph_reclaim_caps_nr(mdsc, ctx->used);
329}
330
331struct ceph_cap *ceph_get_cap(struct ceph_mds_client *mdsc,
332 struct ceph_cap_reservation *ctx)
333{
334 struct ceph_client *cl = mdsc->fsc->client;
335 struct ceph_cap *cap = NULL;
336
337 /* temporary, until we do something about cap import/export */
338 if (!ctx) {
339 cap = kmem_cache_alloc(ceph_cap_cachep, GFP_NOFS);
340 if (cap) {
341 spin_lock(&mdsc->caps_list_lock);
342 mdsc->caps_use_count++;
343 mdsc->caps_total_count++;
344 spin_unlock(&mdsc->caps_list_lock);
345 } else {
346 spin_lock(&mdsc->caps_list_lock);
347 if (mdsc->caps_avail_count) {
348 BUG_ON(list_empty(&mdsc->caps_list));
349
350 mdsc->caps_avail_count--;
351 mdsc->caps_use_count++;
352 cap = list_first_entry(&mdsc->caps_list,
353 struct ceph_cap, caps_item);
354 list_del(&cap->caps_item);
355
356 BUG_ON(mdsc->caps_total_count != mdsc->caps_use_count +
357 mdsc->caps_reserve_count + mdsc->caps_avail_count);
358 }
359 spin_unlock(&mdsc->caps_list_lock);
360 }
361
362 return cap;
363 }
364
365 spin_lock(&mdsc->caps_list_lock);
366 doutc(cl, "ctx=%p (%d) %d = %d used + %d resv + %d avail\n", ctx,
367 ctx->count, mdsc->caps_total_count, mdsc->caps_use_count,
368 mdsc->caps_reserve_count, mdsc->caps_avail_count);
369 BUG_ON(!ctx->count);
370 BUG_ON(ctx->count > mdsc->caps_reserve_count);
371 BUG_ON(list_empty(&mdsc->caps_list));
372
373 ctx->count--;
374 ctx->used++;
375 mdsc->caps_reserve_count--;
376 mdsc->caps_use_count++;
377
378 cap = list_first_entry(&mdsc->caps_list, struct ceph_cap, caps_item);
379 list_del(&cap->caps_item);
380
381 BUG_ON(mdsc->caps_total_count != mdsc->caps_use_count +
382 mdsc->caps_reserve_count + mdsc->caps_avail_count);
383 spin_unlock(&mdsc->caps_list_lock);
384 return cap;
385}
386
387void ceph_put_cap(struct ceph_mds_client *mdsc, struct ceph_cap *cap)
388{
389 struct ceph_client *cl = mdsc->fsc->client;
390
391 spin_lock(&mdsc->caps_list_lock);
392 doutc(cl, "%p %d = %d used + %d resv + %d avail\n", cap,
393 mdsc->caps_total_count, mdsc->caps_use_count,
394 mdsc->caps_reserve_count, mdsc->caps_avail_count);
395 mdsc->caps_use_count--;
396 /*
397 * Keep some preallocated caps around (ceph_min_count), to
398 * avoid lots of free/alloc churn.
399 */
400 if (mdsc->caps_avail_count >= mdsc->caps_reserve_count +
401 mdsc->caps_min_count) {
402 mdsc->caps_total_count--;
403 kmem_cache_free(ceph_cap_cachep, cap);
404 } else {
405 mdsc->caps_avail_count++;
406 list_add(&cap->caps_item, &mdsc->caps_list);
407 }
408
409 BUG_ON(mdsc->caps_total_count != mdsc->caps_use_count +
410 mdsc->caps_reserve_count + mdsc->caps_avail_count);
411 spin_unlock(&mdsc->caps_list_lock);
412}
413
414void ceph_reservation_status(struct ceph_fs_client *fsc,
415 int *total, int *avail, int *used, int *reserved,
416 int *min)
417{
418 struct ceph_mds_client *mdsc = fsc->mdsc;
419
420 spin_lock(&mdsc->caps_list_lock);
421
422 if (total)
423 *total = mdsc->caps_total_count;
424 if (avail)
425 *avail = mdsc->caps_avail_count;
426 if (used)
427 *used = mdsc->caps_use_count;
428 if (reserved)
429 *reserved = mdsc->caps_reserve_count;
430 if (min)
431 *min = mdsc->caps_min_count;
432
433 spin_unlock(&mdsc->caps_list_lock);
434}
435
436/*
437 * Find ceph_cap for given mds, if any.
438 *
439 * Called with i_ceph_lock held.
440 */
441struct ceph_cap *__get_cap_for_mds(struct ceph_inode_info *ci, int mds)
442{
443 struct ceph_cap *cap;
444 struct rb_node *n = ci->i_caps.rb_node;
445
446 while (n) {
447 cap = rb_entry(n, struct ceph_cap, ci_node);
448 if (mds < cap->mds)
449 n = n->rb_left;
450 else if (mds > cap->mds)
451 n = n->rb_right;
452 else
453 return cap;
454 }
455 return NULL;
456}
457
458struct ceph_cap *ceph_get_cap_for_mds(struct ceph_inode_info *ci, int mds)
459{
460 struct ceph_cap *cap;
461
462 spin_lock(&ci->i_ceph_lock);
463 cap = __get_cap_for_mds(ci, mds);
464 spin_unlock(&ci->i_ceph_lock);
465 return cap;
466}
467
468/*
469 * Called under i_ceph_lock.
470 */
471static void __insert_cap_node(struct ceph_inode_info *ci,
472 struct ceph_cap *new)
473{
474 struct rb_node **p = &ci->i_caps.rb_node;
475 struct rb_node *parent = NULL;
476 struct ceph_cap *cap = NULL;
477
478 while (*p) {
479 parent = *p;
480 cap = rb_entry(parent, struct ceph_cap, ci_node);
481 if (new->mds < cap->mds)
482 p = &(*p)->rb_left;
483 else if (new->mds > cap->mds)
484 p = &(*p)->rb_right;
485 else
486 BUG();
487 }
488
489 rb_link_node(&new->ci_node, parent, p);
490 rb_insert_color(&new->ci_node, &ci->i_caps);
491}
492
493/*
494 * (re)set cap hold timeouts, which control the delayed release
495 * of unused caps back to the MDS. Should be called on cap use.
496 */
497static void __cap_set_timeouts(struct ceph_mds_client *mdsc,
498 struct ceph_inode_info *ci)
499{
500 struct inode *inode = &ci->netfs.inode;
501 struct ceph_mount_options *opt = mdsc->fsc->mount_options;
502
503 ci->i_hold_caps_max = round_jiffies(jiffies +
504 opt->caps_wanted_delay_max * HZ);
505 doutc(mdsc->fsc->client, "%p %llx.%llx %lu\n", inode,
506 ceph_vinop(inode), ci->i_hold_caps_max - jiffies);
507}
508
509/*
510 * (Re)queue cap at the end of the delayed cap release list.
511 *
512 * If I_FLUSH is set, leave the inode at the front of the list.
513 *
514 * Caller holds i_ceph_lock
515 * -> we take mdsc->cap_delay_lock
516 */
517static void __cap_delay_requeue(struct ceph_mds_client *mdsc,
518 struct ceph_inode_info *ci)
519{
520 struct inode *inode = &ci->netfs.inode;
521
522 doutc(mdsc->fsc->client, "%p %llx.%llx flags 0x%lx at %lu\n",
523 inode, ceph_vinop(inode), ci->i_ceph_flags,
524 ci->i_hold_caps_max);
525 if (!mdsc->stopping) {
526 spin_lock(&mdsc->cap_delay_lock);
527 if (!list_empty(&ci->i_cap_delay_list)) {
528 if (ci->i_ceph_flags & CEPH_I_FLUSH)
529 goto no_change;
530 list_del_init(&ci->i_cap_delay_list);
531 }
532 __cap_set_timeouts(mdsc, ci);
533 list_add_tail(&ci->i_cap_delay_list, &mdsc->cap_delay_list);
534no_change:
535 spin_unlock(&mdsc->cap_delay_lock);
536 }
537}
538
539/*
540 * Queue an inode for immediate writeback. Mark inode with I_FLUSH,
541 * indicating we should send a cap message to flush dirty metadata
542 * asap, and move to the front of the delayed cap list.
543 */
544static void __cap_delay_requeue_front(struct ceph_mds_client *mdsc,
545 struct ceph_inode_info *ci)
546{
547 struct inode *inode = &ci->netfs.inode;
548
549 doutc(mdsc->fsc->client, "%p %llx.%llx\n", inode, ceph_vinop(inode));
550 spin_lock(&mdsc->cap_delay_lock);
551 ci->i_ceph_flags |= CEPH_I_FLUSH;
552 if (!list_empty(&ci->i_cap_delay_list))
553 list_del_init(&ci->i_cap_delay_list);
554 list_add(&ci->i_cap_delay_list, &mdsc->cap_delay_list);
555 spin_unlock(&mdsc->cap_delay_lock);
556}
557
558/*
559 * Cancel delayed work on cap.
560 *
561 * Caller must hold i_ceph_lock.
562 */
563static void __cap_delay_cancel(struct ceph_mds_client *mdsc,
564 struct ceph_inode_info *ci)
565{
566 struct inode *inode = &ci->netfs.inode;
567
568 doutc(mdsc->fsc->client, "%p %llx.%llx\n", inode, ceph_vinop(inode));
569 if (list_empty(&ci->i_cap_delay_list))
570 return;
571 spin_lock(&mdsc->cap_delay_lock);
572 list_del_init(&ci->i_cap_delay_list);
573 spin_unlock(&mdsc->cap_delay_lock);
574}
575
576/* Common issue checks for add_cap, handle_cap_grant. */
577static void __check_cap_issue(struct ceph_inode_info *ci, struct ceph_cap *cap,
578 unsigned issued)
579{
580 struct inode *inode = &ci->netfs.inode;
581 struct ceph_client *cl = ceph_inode_to_client(inode);
582
583 unsigned had = __ceph_caps_issued(ci, NULL);
584
585 lockdep_assert_held(&ci->i_ceph_lock);
586
587 /*
588 * Each time we receive FILE_CACHE anew, we increment
589 * i_rdcache_gen.
590 */
591 if (S_ISREG(ci->netfs.inode.i_mode) &&
592 (issued & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) &&
593 (had & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) == 0) {
594 ci->i_rdcache_gen++;
595 }
596
597 /*
598 * If FILE_SHARED is newly issued, mark dir not complete. We don't
599 * know what happened to this directory while we didn't have the cap.
600 * If FILE_SHARED is being revoked, also mark dir not complete. It
601 * stops on-going cached readdir.
602 */
603 if ((issued & CEPH_CAP_FILE_SHARED) != (had & CEPH_CAP_FILE_SHARED)) {
604 if (issued & CEPH_CAP_FILE_SHARED)
605 atomic_inc(&ci->i_shared_gen);
606 if (S_ISDIR(ci->netfs.inode.i_mode)) {
607 doutc(cl, " marking %p NOT complete\n", inode);
608 __ceph_dir_clear_complete(ci);
609 }
610 }
611
612 /* Wipe saved layout if we're losing DIR_CREATE caps */
613 if (S_ISDIR(ci->netfs.inode.i_mode) && (had & CEPH_CAP_DIR_CREATE) &&
614 !(issued & CEPH_CAP_DIR_CREATE)) {
615 ceph_put_string(rcu_dereference_raw(ci->i_cached_layout.pool_ns));
616 memset(&ci->i_cached_layout, 0, sizeof(ci->i_cached_layout));
617 }
618}
619
620/**
621 * change_auth_cap_ses - move inode to appropriate lists when auth caps change
622 * @ci: inode to be moved
623 * @session: new auth caps session
624 */
625void change_auth_cap_ses(struct ceph_inode_info *ci,
626 struct ceph_mds_session *session)
627{
628 lockdep_assert_held(&ci->i_ceph_lock);
629
630 if (list_empty(&ci->i_dirty_item) && list_empty(&ci->i_flushing_item))
631 return;
632
633 spin_lock(&session->s_mdsc->cap_dirty_lock);
634 if (!list_empty(&ci->i_dirty_item))
635 list_move(&ci->i_dirty_item, &session->s_cap_dirty);
636 if (!list_empty(&ci->i_flushing_item))
637 list_move_tail(&ci->i_flushing_item, &session->s_cap_flushing);
638 spin_unlock(&session->s_mdsc->cap_dirty_lock);
639}
640
641/*
642 * Add a capability under the given MDS session.
643 *
644 * Caller should hold session snap_rwsem (read) and ci->i_ceph_lock
645 *
646 * @fmode is the open file mode, if we are opening a file, otherwise
647 * it is < 0. (This is so we can atomically add the cap and add an
648 * open file reference to it.)
649 */
650void ceph_add_cap(struct inode *inode,
651 struct ceph_mds_session *session, u64 cap_id,
652 unsigned issued, unsigned wanted,
653 unsigned seq, unsigned mseq, u64 realmino, int flags,
654 struct ceph_cap **new_cap)
655{
656 struct ceph_mds_client *mdsc = ceph_inode_to_fs_client(inode)->mdsc;
657 struct ceph_client *cl = ceph_inode_to_client(inode);
658 struct ceph_inode_info *ci = ceph_inode(inode);
659 struct ceph_cap *cap;
660 int mds = session->s_mds;
661 int actual_wanted;
662 u32 gen;
663
664 lockdep_assert_held(&ci->i_ceph_lock);
665
666 doutc(cl, "%p %llx.%llx mds%d cap %llx %s seq %d\n", inode,
667 ceph_vinop(inode), session->s_mds, cap_id,
668 ceph_cap_string(issued), seq);
669
670 gen = atomic_read(&session->s_cap_gen);
671
672 cap = __get_cap_for_mds(ci, mds);
673 if (!cap) {
674 cap = *new_cap;
675 *new_cap = NULL;
676
677 cap->issued = 0;
678 cap->implemented = 0;
679 cap->mds = mds;
680 cap->mds_wanted = 0;
681 cap->mseq = 0;
682
683 cap->ci = ci;
684 __insert_cap_node(ci, cap);
685
686 /* add to session cap list */
687 cap->session = session;
688 spin_lock(&session->s_cap_lock);
689 list_add_tail(&cap->session_caps, &session->s_caps);
690 session->s_nr_caps++;
691 atomic64_inc(&mdsc->metric.total_caps);
692 spin_unlock(&session->s_cap_lock);
693 } else {
694 spin_lock(&session->s_cap_lock);
695 list_move_tail(&cap->session_caps, &session->s_caps);
696 spin_unlock(&session->s_cap_lock);
697
698 if (cap->cap_gen < gen)
699 cap->issued = cap->implemented = CEPH_CAP_PIN;
700
701 /*
702 * auth mds of the inode changed. we received the cap export
703 * message, but still haven't received the cap import message.
704 * handle_cap_export() updated the new auth MDS' cap.
705 *
706 * "ceph_seq_cmp(seq, cap->seq) <= 0" means we are processing
707 * a message that was send before the cap import message. So
708 * don't remove caps.
709 */
710 if (ceph_seq_cmp(seq, cap->seq) <= 0) {
711 WARN_ON(cap != ci->i_auth_cap);
712 WARN_ON(cap->cap_id != cap_id);
713 seq = cap->seq;
714 mseq = cap->mseq;
715 issued |= cap->issued;
716 flags |= CEPH_CAP_FLAG_AUTH;
717 }
718 }
719
720 if (!ci->i_snap_realm ||
721 ((flags & CEPH_CAP_FLAG_AUTH) &&
722 realmino != (u64)-1 && ci->i_snap_realm->ino != realmino)) {
723 /*
724 * add this inode to the appropriate snap realm
725 */
726 struct ceph_snap_realm *realm = ceph_lookup_snap_realm(mdsc,
727 realmino);
728 if (realm)
729 ceph_change_snap_realm(inode, realm);
730 else
731 WARN(1, "%s: couldn't find snap realm 0x%llx (ino 0x%llx oldrealm 0x%llx)\n",
732 __func__, realmino, ci->i_vino.ino,
733 ci->i_snap_realm ? ci->i_snap_realm->ino : 0);
734 }
735
736 __check_cap_issue(ci, cap, issued);
737
738 /*
739 * If we are issued caps we don't want, or the mds' wanted
740 * value appears to be off, queue a check so we'll release
741 * later and/or update the mds wanted value.
742 */
743 actual_wanted = __ceph_caps_wanted(ci);
744 if ((wanted & ~actual_wanted) ||
745 (issued & ~actual_wanted & CEPH_CAP_ANY_WR)) {
746 doutc(cl, "issued %s, mds wanted %s, actual %s, queueing\n",
747 ceph_cap_string(issued), ceph_cap_string(wanted),
748 ceph_cap_string(actual_wanted));
749 __cap_delay_requeue(mdsc, ci);
750 }
751
752 if (flags & CEPH_CAP_FLAG_AUTH) {
753 if (!ci->i_auth_cap ||
754 ceph_seq_cmp(ci->i_auth_cap->mseq, mseq) < 0) {
755 if (ci->i_auth_cap &&
756 ci->i_auth_cap->session != cap->session)
757 change_auth_cap_ses(ci, cap->session);
758 ci->i_auth_cap = cap;
759 cap->mds_wanted = wanted;
760 }
761 } else {
762 WARN_ON(ci->i_auth_cap == cap);
763 }
764
765 doutc(cl, "inode %p %llx.%llx cap %p %s now %s seq %d mds%d\n",
766 inode, ceph_vinop(inode), cap, ceph_cap_string(issued),
767 ceph_cap_string(issued|cap->issued), seq, mds);
768 cap->cap_id = cap_id;
769 cap->issued = issued;
770 cap->implemented |= issued;
771 if (ceph_seq_cmp(mseq, cap->mseq) > 0)
772 cap->mds_wanted = wanted;
773 else
774 cap->mds_wanted |= wanted;
775 cap->seq = seq;
776 cap->issue_seq = seq;
777 cap->mseq = mseq;
778 cap->cap_gen = gen;
779 wake_up_all(&ci->i_cap_wq);
780}
781
782/*
783 * Return true if cap has not timed out and belongs to the current
784 * generation of the MDS session (i.e. has not gone 'stale' due to
785 * us losing touch with the mds).
786 */
787static int __cap_is_valid(struct ceph_cap *cap)
788{
789 struct inode *inode = &cap->ci->netfs.inode;
790 struct ceph_client *cl = cap->session->s_mdsc->fsc->client;
791 unsigned long ttl;
792 u32 gen;
793
794 gen = atomic_read(&cap->session->s_cap_gen);
795 ttl = cap->session->s_cap_ttl;
796
797 if (cap->cap_gen < gen || time_after_eq(jiffies, ttl)) {
798 doutc(cl, "%p %llx.%llx cap %p issued %s but STALE (gen %u vs %u)\n",
799 inode, ceph_vinop(inode), cap,
800 ceph_cap_string(cap->issued), cap->cap_gen, gen);
801 return 0;
802 }
803
804 return 1;
805}
806
807/*
808 * Return set of valid cap bits issued to us. Note that caps time
809 * out, and may be invalidated in bulk if the client session times out
810 * and session->s_cap_gen is bumped.
811 */
812int __ceph_caps_issued(struct ceph_inode_info *ci, int *implemented)
813{
814 struct inode *inode = &ci->netfs.inode;
815 struct ceph_client *cl = ceph_inode_to_client(inode);
816 int have = ci->i_snap_caps;
817 struct ceph_cap *cap;
818 struct rb_node *p;
819
820 if (implemented)
821 *implemented = 0;
822 for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
823 cap = rb_entry(p, struct ceph_cap, ci_node);
824 if (!__cap_is_valid(cap))
825 continue;
826 doutc(cl, "%p %llx.%llx cap %p issued %s\n", inode,
827 ceph_vinop(inode), cap, ceph_cap_string(cap->issued));
828 have |= cap->issued;
829 if (implemented)
830 *implemented |= cap->implemented;
831 }
832 /*
833 * exclude caps issued by non-auth MDS, but are been revoking
834 * by the auth MDS. The non-auth MDS should be revoking/exporting
835 * these caps, but the message is delayed.
836 */
837 if (ci->i_auth_cap) {
838 cap = ci->i_auth_cap;
839 have &= ~cap->implemented | cap->issued;
840 }
841 return have;
842}
843
844/*
845 * Get cap bits issued by caps other than @ocap
846 */
847int __ceph_caps_issued_other(struct ceph_inode_info *ci, struct ceph_cap *ocap)
848{
849 int have = ci->i_snap_caps;
850 struct ceph_cap *cap;
851 struct rb_node *p;
852
853 for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
854 cap = rb_entry(p, struct ceph_cap, ci_node);
855 if (cap == ocap)
856 continue;
857 if (!__cap_is_valid(cap))
858 continue;
859 have |= cap->issued;
860 }
861 return have;
862}
863
864/*
865 * Move a cap to the end of the LRU (oldest caps at list head, newest
866 * at list tail).
867 */
868static void __touch_cap(struct ceph_cap *cap)
869{
870 struct inode *inode = &cap->ci->netfs.inode;
871 struct ceph_mds_session *s = cap->session;
872 struct ceph_client *cl = s->s_mdsc->fsc->client;
873
874 spin_lock(&s->s_cap_lock);
875 if (!s->s_cap_iterator) {
876 doutc(cl, "%p %llx.%llx cap %p mds%d\n", inode,
877 ceph_vinop(inode), cap, s->s_mds);
878 list_move_tail(&cap->session_caps, &s->s_caps);
879 } else {
880 doutc(cl, "%p %llx.%llx cap %p mds%d NOP, iterating over caps\n",
881 inode, ceph_vinop(inode), cap, s->s_mds);
882 }
883 spin_unlock(&s->s_cap_lock);
884}
885
886/*
887 * Check if we hold the given mask. If so, move the cap(s) to the
888 * front of their respective LRUs. (This is the preferred way for
889 * callers to check for caps they want.)
890 */
891int __ceph_caps_issued_mask(struct ceph_inode_info *ci, int mask, int touch)
892{
893 struct inode *inode = &ci->netfs.inode;
894 struct ceph_client *cl = ceph_inode_to_client(inode);
895 struct ceph_cap *cap;
896 struct rb_node *p;
897 int have = ci->i_snap_caps;
898
899 if ((have & mask) == mask) {
900 doutc(cl, "mask %p %llx.%llx snap issued %s (mask %s)\n",
901 inode, ceph_vinop(inode), ceph_cap_string(have),
902 ceph_cap_string(mask));
903 return 1;
904 }
905
906 for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
907 cap = rb_entry(p, struct ceph_cap, ci_node);
908 if (!__cap_is_valid(cap))
909 continue;
910 if ((cap->issued & mask) == mask) {
911 doutc(cl, "mask %p %llx.%llx cap %p issued %s (mask %s)\n",
912 inode, ceph_vinop(inode), cap,
913 ceph_cap_string(cap->issued),
914 ceph_cap_string(mask));
915 if (touch)
916 __touch_cap(cap);
917 return 1;
918 }
919
920 /* does a combination of caps satisfy mask? */
921 have |= cap->issued;
922 if ((have & mask) == mask) {
923 doutc(cl, "mask %p %llx.%llx combo issued %s (mask %s)\n",
924 inode, ceph_vinop(inode),
925 ceph_cap_string(cap->issued),
926 ceph_cap_string(mask));
927 if (touch) {
928 struct rb_node *q;
929
930 /* touch this + preceding caps */
931 __touch_cap(cap);
932 for (q = rb_first(&ci->i_caps); q != p;
933 q = rb_next(q)) {
934 cap = rb_entry(q, struct ceph_cap,
935 ci_node);
936 if (!__cap_is_valid(cap))
937 continue;
938 if (cap->issued & mask)
939 __touch_cap(cap);
940 }
941 }
942 return 1;
943 }
944 }
945
946 return 0;
947}
948
949int __ceph_caps_issued_mask_metric(struct ceph_inode_info *ci, int mask,
950 int touch)
951{
952 struct ceph_fs_client *fsc = ceph_sb_to_fs_client(ci->netfs.inode.i_sb);
953 int r;
954
955 r = __ceph_caps_issued_mask(ci, mask, touch);
956 if (r)
957 ceph_update_cap_hit(&fsc->mdsc->metric);
958 else
959 ceph_update_cap_mis(&fsc->mdsc->metric);
960 return r;
961}
962
963/*
964 * Return true if mask caps are currently being revoked by an MDS.
965 */
966int __ceph_caps_revoking_other(struct ceph_inode_info *ci,
967 struct ceph_cap *ocap, int mask)
968{
969 struct ceph_cap *cap;
970 struct rb_node *p;
971
972 for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
973 cap = rb_entry(p, struct ceph_cap, ci_node);
974 if (cap != ocap &&
975 (cap->implemented & ~cap->issued & mask))
976 return 1;
977 }
978 return 0;
979}
980
981int __ceph_caps_used(struct ceph_inode_info *ci)
982{
983 int used = 0;
984 if (ci->i_pin_ref)
985 used |= CEPH_CAP_PIN;
986 if (ci->i_rd_ref)
987 used |= CEPH_CAP_FILE_RD;
988 if (ci->i_rdcache_ref ||
989 (S_ISREG(ci->netfs.inode.i_mode) &&
990 ci->netfs.inode.i_data.nrpages))
991 used |= CEPH_CAP_FILE_CACHE;
992 if (ci->i_wr_ref)
993 used |= CEPH_CAP_FILE_WR;
994 if (ci->i_wb_ref || ci->i_wrbuffer_ref)
995 used |= CEPH_CAP_FILE_BUFFER;
996 if (ci->i_fx_ref)
997 used |= CEPH_CAP_FILE_EXCL;
998 return used;
999}
1000
1001#define FMODE_WAIT_BIAS 1000
1002
1003/*
1004 * wanted, by virtue of open file modes
1005 */
1006int __ceph_caps_file_wanted(struct ceph_inode_info *ci)
1007{
1008 const int PIN_SHIFT = ffs(CEPH_FILE_MODE_PIN);
1009 const int RD_SHIFT = ffs(CEPH_FILE_MODE_RD);
1010 const int WR_SHIFT = ffs(CEPH_FILE_MODE_WR);
1011 const int LAZY_SHIFT = ffs(CEPH_FILE_MODE_LAZY);
1012 struct ceph_mount_options *opt =
1013 ceph_inode_to_fs_client(&ci->netfs.inode)->mount_options;
1014 unsigned long used_cutoff = jiffies - opt->caps_wanted_delay_max * HZ;
1015 unsigned long idle_cutoff = jiffies - opt->caps_wanted_delay_min * HZ;
1016
1017 if (S_ISDIR(ci->netfs.inode.i_mode)) {
1018 int want = 0;
1019
1020 /* use used_cutoff here, to keep dir's wanted caps longer */
1021 if (ci->i_nr_by_mode[RD_SHIFT] > 0 ||
1022 time_after(ci->i_last_rd, used_cutoff))
1023 want |= CEPH_CAP_ANY_SHARED;
1024
1025 if (ci->i_nr_by_mode[WR_SHIFT] > 0 ||
1026 time_after(ci->i_last_wr, used_cutoff)) {
1027 want |= CEPH_CAP_ANY_SHARED | CEPH_CAP_FILE_EXCL;
1028 if (opt->flags & CEPH_MOUNT_OPT_ASYNC_DIROPS)
1029 want |= CEPH_CAP_ANY_DIR_OPS;
1030 }
1031
1032 if (want || ci->i_nr_by_mode[PIN_SHIFT] > 0)
1033 want |= CEPH_CAP_PIN;
1034
1035 return want;
1036 } else {
1037 int bits = 0;
1038
1039 if (ci->i_nr_by_mode[RD_SHIFT] > 0) {
1040 if (ci->i_nr_by_mode[RD_SHIFT] >= FMODE_WAIT_BIAS ||
1041 time_after(ci->i_last_rd, used_cutoff))
1042 bits |= 1 << RD_SHIFT;
1043 } else if (time_after(ci->i_last_rd, idle_cutoff)) {
1044 bits |= 1 << RD_SHIFT;
1045 }
1046
1047 if (ci->i_nr_by_mode[WR_SHIFT] > 0) {
1048 if (ci->i_nr_by_mode[WR_SHIFT] >= FMODE_WAIT_BIAS ||
1049 time_after(ci->i_last_wr, used_cutoff))
1050 bits |= 1 << WR_SHIFT;
1051 } else if (time_after(ci->i_last_wr, idle_cutoff)) {
1052 bits |= 1 << WR_SHIFT;
1053 }
1054
1055 /* check lazyio only when read/write is wanted */
1056 if ((bits & (CEPH_FILE_MODE_RDWR << 1)) &&
1057 ci->i_nr_by_mode[LAZY_SHIFT] > 0)
1058 bits |= 1 << LAZY_SHIFT;
1059
1060 return bits ? ceph_caps_for_mode(bits >> 1) : 0;
1061 }
1062}
1063
1064/*
1065 * wanted, by virtue of open file modes AND cap refs (buffered/cached data)
1066 */
1067int __ceph_caps_wanted(struct ceph_inode_info *ci)
1068{
1069 int w = __ceph_caps_file_wanted(ci) | __ceph_caps_used(ci);
1070 if (S_ISDIR(ci->netfs.inode.i_mode)) {
1071 /* we want EXCL if holding caps of dir ops */
1072 if (w & CEPH_CAP_ANY_DIR_OPS)
1073 w |= CEPH_CAP_FILE_EXCL;
1074 } else {
1075 /* we want EXCL if dirty data */
1076 if (w & CEPH_CAP_FILE_BUFFER)
1077 w |= CEPH_CAP_FILE_EXCL;
1078 }
1079 return w;
1080}
1081
1082/*
1083 * Return caps we have registered with the MDS(s) as 'wanted'.
1084 */
1085int __ceph_caps_mds_wanted(struct ceph_inode_info *ci, bool check)
1086{
1087 struct ceph_cap *cap;
1088 struct rb_node *p;
1089 int mds_wanted = 0;
1090
1091 for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
1092 cap = rb_entry(p, struct ceph_cap, ci_node);
1093 if (check && !__cap_is_valid(cap))
1094 continue;
1095 if (cap == ci->i_auth_cap)
1096 mds_wanted |= cap->mds_wanted;
1097 else
1098 mds_wanted |= (cap->mds_wanted & ~CEPH_CAP_ANY_FILE_WR);
1099 }
1100 return mds_wanted;
1101}
1102
1103int ceph_is_any_caps(struct inode *inode)
1104{
1105 struct ceph_inode_info *ci = ceph_inode(inode);
1106 int ret;
1107
1108 spin_lock(&ci->i_ceph_lock);
1109 ret = __ceph_is_any_real_caps(ci);
1110 spin_unlock(&ci->i_ceph_lock);
1111
1112 return ret;
1113}
1114
1115/*
1116 * Remove a cap. Take steps to deal with a racing iterate_session_caps.
1117 *
1118 * caller should hold i_ceph_lock.
1119 * caller will not hold session s_mutex if called from destroy_inode.
1120 */
1121void __ceph_remove_cap(struct ceph_cap *cap, bool queue_release)
1122{
1123 struct ceph_mds_session *session = cap->session;
1124 struct ceph_client *cl = session->s_mdsc->fsc->client;
1125 struct ceph_inode_info *ci = cap->ci;
1126 struct inode *inode = &ci->netfs.inode;
1127 struct ceph_mds_client *mdsc;
1128 int removed = 0;
1129
1130 /* 'ci' being NULL means the remove have already occurred */
1131 if (!ci) {
1132 doutc(cl, "inode is NULL\n");
1133 return;
1134 }
1135
1136 lockdep_assert_held(&ci->i_ceph_lock);
1137
1138 doutc(cl, "%p from %p %llx.%llx\n", cap, inode, ceph_vinop(inode));
1139
1140 mdsc = ceph_inode_to_fs_client(&ci->netfs.inode)->mdsc;
1141
1142 /* remove from inode's cap rbtree, and clear auth cap */
1143 rb_erase(&cap->ci_node, &ci->i_caps);
1144 if (ci->i_auth_cap == cap)
1145 ci->i_auth_cap = NULL;
1146
1147 /* remove from session list */
1148 spin_lock(&session->s_cap_lock);
1149 if (session->s_cap_iterator == cap) {
1150 /* not yet, we are iterating over this very cap */
1151 doutc(cl, "delaying %p removal from session %p\n", cap,
1152 cap->session);
1153 } else {
1154 list_del_init(&cap->session_caps);
1155 session->s_nr_caps--;
1156 atomic64_dec(&mdsc->metric.total_caps);
1157 cap->session = NULL;
1158 removed = 1;
1159 }
1160 /* protect backpointer with s_cap_lock: see iterate_session_caps */
1161 cap->ci = NULL;
1162
1163 /*
1164 * s_cap_reconnect is protected by s_cap_lock. no one changes
1165 * s_cap_gen while session is in the reconnect state.
1166 */
1167 if (queue_release &&
1168 (!session->s_cap_reconnect ||
1169 cap->cap_gen == atomic_read(&session->s_cap_gen))) {
1170 cap->queue_release = 1;
1171 if (removed) {
1172 __ceph_queue_cap_release(session, cap);
1173 removed = 0;
1174 }
1175 } else {
1176 cap->queue_release = 0;
1177 }
1178 cap->cap_ino = ci->i_vino.ino;
1179
1180 spin_unlock(&session->s_cap_lock);
1181
1182 if (removed)
1183 ceph_put_cap(mdsc, cap);
1184
1185 if (!__ceph_is_any_real_caps(ci)) {
1186 /* when reconnect denied, we remove session caps forcibly,
1187 * i_wr_ref can be non-zero. If there are ongoing write,
1188 * keep i_snap_realm.
1189 */
1190 if (ci->i_wr_ref == 0 && ci->i_snap_realm)
1191 ceph_change_snap_realm(&ci->netfs.inode, NULL);
1192
1193 __cap_delay_cancel(mdsc, ci);
1194 }
1195}
1196
1197void ceph_remove_cap(struct ceph_mds_client *mdsc, struct ceph_cap *cap,
1198 bool queue_release)
1199{
1200 struct ceph_inode_info *ci = cap->ci;
1201 struct ceph_fs_client *fsc;
1202
1203 /* 'ci' being NULL means the remove have already occurred */
1204 if (!ci) {
1205 doutc(mdsc->fsc->client, "inode is NULL\n");
1206 return;
1207 }
1208
1209 lockdep_assert_held(&ci->i_ceph_lock);
1210
1211 fsc = ceph_inode_to_fs_client(&ci->netfs.inode);
1212 WARN_ON_ONCE(ci->i_auth_cap == cap &&
1213 !list_empty(&ci->i_dirty_item) &&
1214 !fsc->blocklisted &&
1215 !ceph_inode_is_shutdown(&ci->netfs.inode));
1216
1217 __ceph_remove_cap(cap, queue_release);
1218}
1219
1220struct cap_msg_args {
1221 struct ceph_mds_session *session;
1222 u64 ino, cid, follows;
1223 u64 flush_tid, oldest_flush_tid, size, max_size;
1224 u64 xattr_version;
1225 u64 change_attr;
1226 struct ceph_buffer *xattr_buf;
1227 struct ceph_buffer *old_xattr_buf;
1228 struct timespec64 atime, mtime, ctime, btime;
1229 int op, caps, wanted, dirty;
1230 u32 seq, issue_seq, mseq, time_warp_seq;
1231 u32 flags;
1232 kuid_t uid;
1233 kgid_t gid;
1234 umode_t mode;
1235 bool inline_data;
1236 bool wake;
1237 bool encrypted;
1238 u32 fscrypt_auth_len;
1239 u8 fscrypt_auth[sizeof(struct ceph_fscrypt_auth)]; // for context
1240};
1241
1242/* Marshal up the cap msg to the MDS */
1243static void encode_cap_msg(struct ceph_msg *msg, struct cap_msg_args *arg)
1244{
1245 struct ceph_mds_caps *fc;
1246 void *p;
1247 struct ceph_mds_client *mdsc = arg->session->s_mdsc;
1248 struct ceph_osd_client *osdc = &mdsc->fsc->client->osdc;
1249
1250 doutc(mdsc->fsc->client,
1251 "%s %llx %llx caps %s wanted %s dirty %s seq %u/%u"
1252 " tid %llu/%llu mseq %u follows %lld size %llu/%llu"
1253 " xattr_ver %llu xattr_len %d\n",
1254 ceph_cap_op_name(arg->op), arg->cid, arg->ino,
1255 ceph_cap_string(arg->caps), ceph_cap_string(arg->wanted),
1256 ceph_cap_string(arg->dirty), arg->seq, arg->issue_seq,
1257 arg->flush_tid, arg->oldest_flush_tid, arg->mseq, arg->follows,
1258 arg->size, arg->max_size, arg->xattr_version,
1259 arg->xattr_buf ? (int)arg->xattr_buf->vec.iov_len : 0);
1260
1261 msg->hdr.version = cpu_to_le16(12);
1262 msg->hdr.tid = cpu_to_le64(arg->flush_tid);
1263
1264 fc = msg->front.iov_base;
1265 memset(fc, 0, sizeof(*fc));
1266
1267 fc->cap_id = cpu_to_le64(arg->cid);
1268 fc->op = cpu_to_le32(arg->op);
1269 fc->seq = cpu_to_le32(arg->seq);
1270 fc->issue_seq = cpu_to_le32(arg->issue_seq);
1271 fc->migrate_seq = cpu_to_le32(arg->mseq);
1272 fc->caps = cpu_to_le32(arg->caps);
1273 fc->wanted = cpu_to_le32(arg->wanted);
1274 fc->dirty = cpu_to_le32(arg->dirty);
1275 fc->ino = cpu_to_le64(arg->ino);
1276 fc->snap_follows = cpu_to_le64(arg->follows);
1277
1278#if IS_ENABLED(CONFIG_FS_ENCRYPTION)
1279 if (arg->encrypted)
1280 fc->size = cpu_to_le64(round_up(arg->size,
1281 CEPH_FSCRYPT_BLOCK_SIZE));
1282 else
1283#endif
1284 fc->size = cpu_to_le64(arg->size);
1285 fc->max_size = cpu_to_le64(arg->max_size);
1286 ceph_encode_timespec64(&fc->mtime, &arg->mtime);
1287 ceph_encode_timespec64(&fc->atime, &arg->atime);
1288 ceph_encode_timespec64(&fc->ctime, &arg->ctime);
1289 fc->time_warp_seq = cpu_to_le32(arg->time_warp_seq);
1290
1291 fc->uid = cpu_to_le32(from_kuid(&init_user_ns, arg->uid));
1292 fc->gid = cpu_to_le32(from_kgid(&init_user_ns, arg->gid));
1293 fc->mode = cpu_to_le32(arg->mode);
1294
1295 fc->xattr_version = cpu_to_le64(arg->xattr_version);
1296 if (arg->xattr_buf) {
1297 msg->middle = ceph_buffer_get(arg->xattr_buf);
1298 fc->xattr_len = cpu_to_le32(arg->xattr_buf->vec.iov_len);
1299 msg->hdr.middle_len = cpu_to_le32(arg->xattr_buf->vec.iov_len);
1300 }
1301
1302 p = fc + 1;
1303 /* flock buffer size (version 2) */
1304 ceph_encode_32(&p, 0);
1305 /* inline version (version 4) */
1306 ceph_encode_64(&p, arg->inline_data ? 0 : CEPH_INLINE_NONE);
1307 /* inline data size */
1308 ceph_encode_32(&p, 0);
1309 /*
1310 * osd_epoch_barrier (version 5)
1311 * The epoch_barrier is protected osdc->lock, so READ_ONCE here in
1312 * case it was recently changed
1313 */
1314 ceph_encode_32(&p, READ_ONCE(osdc->epoch_barrier));
1315 /* oldest_flush_tid (version 6) */
1316 ceph_encode_64(&p, arg->oldest_flush_tid);
1317
1318 /*
1319 * caller_uid/caller_gid (version 7)
1320 *
1321 * Currently, we don't properly track which caller dirtied the caps
1322 * last, and force a flush of them when there is a conflict. For now,
1323 * just set this to 0:0, to emulate how the MDS has worked up to now.
1324 */
1325 ceph_encode_32(&p, 0);
1326 ceph_encode_32(&p, 0);
1327
1328 /* pool namespace (version 8) (mds always ignores this) */
1329 ceph_encode_32(&p, 0);
1330
1331 /* btime and change_attr (version 9) */
1332 ceph_encode_timespec64(p, &arg->btime);
1333 p += sizeof(struct ceph_timespec);
1334 ceph_encode_64(&p, arg->change_attr);
1335
1336 /* Advisory flags (version 10) */
1337 ceph_encode_32(&p, arg->flags);
1338
1339 /* dirstats (version 11) - these are r/o on the client */
1340 ceph_encode_64(&p, 0);
1341 ceph_encode_64(&p, 0);
1342
1343#if IS_ENABLED(CONFIG_FS_ENCRYPTION)
1344 /*
1345 * fscrypt_auth and fscrypt_file (version 12)
1346 *
1347 * fscrypt_auth holds the crypto context (if any). fscrypt_file
1348 * tracks the real i_size as an __le64 field (and we use a rounded-up
1349 * i_size in the traditional size field).
1350 */
1351 ceph_encode_32(&p, arg->fscrypt_auth_len);
1352 ceph_encode_copy(&p, arg->fscrypt_auth, arg->fscrypt_auth_len);
1353 ceph_encode_32(&p, sizeof(__le64));
1354 ceph_encode_64(&p, arg->size);
1355#else /* CONFIG_FS_ENCRYPTION */
1356 ceph_encode_32(&p, 0);
1357 ceph_encode_32(&p, 0);
1358#endif /* CONFIG_FS_ENCRYPTION */
1359}
1360
1361/*
1362 * Queue cap releases when an inode is dropped from our cache.
1363 */
1364void __ceph_remove_caps(struct ceph_inode_info *ci)
1365{
1366 struct inode *inode = &ci->netfs.inode;
1367 struct ceph_mds_client *mdsc = ceph_inode_to_fs_client(inode)->mdsc;
1368 struct rb_node *p;
1369
1370 /* lock i_ceph_lock, because ceph_d_revalidate(..., LOOKUP_RCU)
1371 * may call __ceph_caps_issued_mask() on a freeing inode. */
1372 spin_lock(&ci->i_ceph_lock);
1373 p = rb_first(&ci->i_caps);
1374 while (p) {
1375 struct ceph_cap *cap = rb_entry(p, struct ceph_cap, ci_node);
1376 p = rb_next(p);
1377 ceph_remove_cap(mdsc, cap, true);
1378 }
1379 spin_unlock(&ci->i_ceph_lock);
1380}
1381
1382/*
1383 * Prepare to send a cap message to an MDS. Update the cap state, and populate
1384 * the arg struct with the parameters that will need to be sent. This should
1385 * be done under the i_ceph_lock to guard against changes to cap state.
1386 *
1387 * Make note of max_size reported/requested from mds, revoked caps
1388 * that have now been implemented.
1389 */
1390static void __prep_cap(struct cap_msg_args *arg, struct ceph_cap *cap,
1391 int op, int flags, int used, int want, int retain,
1392 int flushing, u64 flush_tid, u64 oldest_flush_tid)
1393{
1394 struct ceph_inode_info *ci = cap->ci;
1395 struct inode *inode = &ci->netfs.inode;
1396 struct ceph_client *cl = ceph_inode_to_client(inode);
1397 int held, revoking;
1398
1399 lockdep_assert_held(&ci->i_ceph_lock);
1400
1401 held = cap->issued | cap->implemented;
1402 revoking = cap->implemented & ~cap->issued;
1403 retain &= ~revoking;
1404
1405 doutc(cl, "%p %llx.%llx cap %p session %p %s -> %s (revoking %s)\n",
1406 inode, ceph_vinop(inode), cap, cap->session,
1407 ceph_cap_string(held), ceph_cap_string(held & retain),
1408 ceph_cap_string(revoking));
1409 BUG_ON((retain & CEPH_CAP_PIN) == 0);
1410
1411 ci->i_ceph_flags &= ~CEPH_I_FLUSH;
1412
1413 cap->issued &= retain; /* drop bits we don't want */
1414 /*
1415 * Wake up any waiters on wanted -> needed transition. This is due to
1416 * the weird transition from buffered to sync IO... we need to flush
1417 * dirty pages _before_ allowing sync writes to avoid reordering.
1418 */
1419 arg->wake = cap->implemented & ~cap->issued;
1420 cap->implemented &= cap->issued | used;
1421 cap->mds_wanted = want;
1422
1423 arg->session = cap->session;
1424 arg->ino = ceph_vino(inode).ino;
1425 arg->cid = cap->cap_id;
1426 arg->follows = flushing ? ci->i_head_snapc->seq : 0;
1427 arg->flush_tid = flush_tid;
1428 arg->oldest_flush_tid = oldest_flush_tid;
1429 arg->size = i_size_read(inode);
1430 ci->i_reported_size = arg->size;
1431 arg->max_size = ci->i_wanted_max_size;
1432 if (cap == ci->i_auth_cap) {
1433 if (want & CEPH_CAP_ANY_FILE_WR)
1434 ci->i_requested_max_size = arg->max_size;
1435 else
1436 ci->i_requested_max_size = 0;
1437 }
1438
1439 if (flushing & CEPH_CAP_XATTR_EXCL) {
1440 arg->old_xattr_buf = __ceph_build_xattrs_blob(ci);
1441 arg->xattr_version = ci->i_xattrs.version;
1442 arg->xattr_buf = ceph_buffer_get(ci->i_xattrs.blob);
1443 } else {
1444 arg->xattr_buf = NULL;
1445 arg->old_xattr_buf = NULL;
1446 }
1447
1448 arg->mtime = inode_get_mtime(inode);
1449 arg->atime = inode_get_atime(inode);
1450 arg->ctime = inode_get_ctime(inode);
1451 arg->btime = ci->i_btime;
1452 arg->change_attr = inode_peek_iversion_raw(inode);
1453
1454 arg->op = op;
1455 arg->caps = cap->implemented;
1456 arg->wanted = want;
1457 arg->dirty = flushing;
1458
1459 arg->seq = cap->seq;
1460 arg->issue_seq = cap->issue_seq;
1461 arg->mseq = cap->mseq;
1462 arg->time_warp_seq = ci->i_time_warp_seq;
1463
1464 arg->uid = inode->i_uid;
1465 arg->gid = inode->i_gid;
1466 arg->mode = inode->i_mode;
1467
1468 arg->inline_data = ci->i_inline_version != CEPH_INLINE_NONE;
1469 if (!(flags & CEPH_CLIENT_CAPS_PENDING_CAPSNAP) &&
1470 !list_empty(&ci->i_cap_snaps)) {
1471 struct ceph_cap_snap *capsnap;
1472 list_for_each_entry_reverse(capsnap, &ci->i_cap_snaps, ci_item) {
1473 if (capsnap->cap_flush.tid)
1474 break;
1475 if (capsnap->need_flush) {
1476 flags |= CEPH_CLIENT_CAPS_PENDING_CAPSNAP;
1477 break;
1478 }
1479 }
1480 }
1481 arg->flags = flags;
1482 arg->encrypted = IS_ENCRYPTED(inode);
1483#if IS_ENABLED(CONFIG_FS_ENCRYPTION)
1484 if (ci->fscrypt_auth_len &&
1485 WARN_ON_ONCE(ci->fscrypt_auth_len > sizeof(struct ceph_fscrypt_auth))) {
1486 /* Don't set this if it's too big */
1487 arg->fscrypt_auth_len = 0;
1488 } else {
1489 arg->fscrypt_auth_len = ci->fscrypt_auth_len;
1490 memcpy(arg->fscrypt_auth, ci->fscrypt_auth,
1491 min_t(size_t, ci->fscrypt_auth_len,
1492 sizeof(arg->fscrypt_auth)));
1493 }
1494#endif /* CONFIG_FS_ENCRYPTION */
1495}
1496
1497#if IS_ENABLED(CONFIG_FS_ENCRYPTION)
1498#define CAP_MSG_FIXED_FIELDS (sizeof(struct ceph_mds_caps) + \
1499 4 + 8 + 4 + 4 + 8 + 4 + 4 + 4 + 8 + 8 + 4 + 8 + 8 + 4 + 4 + 8)
1500
1501static inline int cap_msg_size(struct cap_msg_args *arg)
1502{
1503 return CAP_MSG_FIXED_FIELDS + arg->fscrypt_auth_len;
1504}
1505#else
1506#define CAP_MSG_FIXED_FIELDS (sizeof(struct ceph_mds_caps) + \
1507 4 + 8 + 4 + 4 + 8 + 4 + 4 + 4 + 8 + 8 + 4 + 8 + 8 + 4 + 4)
1508
1509static inline int cap_msg_size(struct cap_msg_args *arg)
1510{
1511 return CAP_MSG_FIXED_FIELDS;
1512}
1513#endif /* CONFIG_FS_ENCRYPTION */
1514
1515/*
1516 * Send a cap msg on the given inode.
1517 *
1518 * Caller should hold snap_rwsem (read), s_mutex.
1519 */
1520static void __send_cap(struct cap_msg_args *arg, struct ceph_inode_info *ci)
1521{
1522 struct ceph_msg *msg;
1523 struct inode *inode = &ci->netfs.inode;
1524 struct ceph_client *cl = ceph_inode_to_client(inode);
1525
1526 msg = ceph_msg_new(CEPH_MSG_CLIENT_CAPS, cap_msg_size(arg), GFP_NOFS,
1527 false);
1528 if (!msg) {
1529 pr_err_client(cl,
1530 "error allocating cap msg: ino (%llx.%llx)"
1531 " flushing %s tid %llu, requeuing cap.\n",
1532 ceph_vinop(inode), ceph_cap_string(arg->dirty),
1533 arg->flush_tid);
1534 spin_lock(&ci->i_ceph_lock);
1535 __cap_delay_requeue(arg->session->s_mdsc, ci);
1536 spin_unlock(&ci->i_ceph_lock);
1537 return;
1538 }
1539
1540 encode_cap_msg(msg, arg);
1541 ceph_con_send(&arg->session->s_con, msg);
1542 ceph_buffer_put(arg->old_xattr_buf);
1543 ceph_buffer_put(arg->xattr_buf);
1544 if (arg->wake)
1545 wake_up_all(&ci->i_cap_wq);
1546}
1547
1548static inline int __send_flush_snap(struct inode *inode,
1549 struct ceph_mds_session *session,
1550 struct ceph_cap_snap *capsnap,
1551 u32 mseq, u64 oldest_flush_tid)
1552{
1553 struct cap_msg_args arg;
1554 struct ceph_msg *msg;
1555
1556 arg.session = session;
1557 arg.ino = ceph_vino(inode).ino;
1558 arg.cid = 0;
1559 arg.follows = capsnap->follows;
1560 arg.flush_tid = capsnap->cap_flush.tid;
1561 arg.oldest_flush_tid = oldest_flush_tid;
1562
1563 arg.size = capsnap->size;
1564 arg.max_size = 0;
1565 arg.xattr_version = capsnap->xattr_version;
1566 arg.xattr_buf = capsnap->xattr_blob;
1567 arg.old_xattr_buf = NULL;
1568
1569 arg.atime = capsnap->atime;
1570 arg.mtime = capsnap->mtime;
1571 arg.ctime = capsnap->ctime;
1572 arg.btime = capsnap->btime;
1573 arg.change_attr = capsnap->change_attr;
1574
1575 arg.op = CEPH_CAP_OP_FLUSHSNAP;
1576 arg.caps = capsnap->issued;
1577 arg.wanted = 0;
1578 arg.dirty = capsnap->dirty;
1579
1580 arg.seq = 0;
1581 arg.issue_seq = 0;
1582 arg.mseq = mseq;
1583 arg.time_warp_seq = capsnap->time_warp_seq;
1584
1585 arg.uid = capsnap->uid;
1586 arg.gid = capsnap->gid;
1587 arg.mode = capsnap->mode;
1588
1589 arg.inline_data = capsnap->inline_data;
1590 arg.flags = 0;
1591 arg.wake = false;
1592 arg.encrypted = IS_ENCRYPTED(inode);
1593
1594 /* No fscrypt_auth changes from a capsnap.*/
1595 arg.fscrypt_auth_len = 0;
1596
1597 msg = ceph_msg_new(CEPH_MSG_CLIENT_CAPS, cap_msg_size(&arg),
1598 GFP_NOFS, false);
1599 if (!msg)
1600 return -ENOMEM;
1601
1602 encode_cap_msg(msg, &arg);
1603 ceph_con_send(&arg.session->s_con, msg);
1604 return 0;
1605}
1606
1607/*
1608 * When a snapshot is taken, clients accumulate dirty metadata on
1609 * inodes with capabilities in ceph_cap_snaps to describe the file
1610 * state at the time the snapshot was taken. This must be flushed
1611 * asynchronously back to the MDS once sync writes complete and dirty
1612 * data is written out.
1613 *
1614 * Called under i_ceph_lock.
1615 */
1616static void __ceph_flush_snaps(struct ceph_inode_info *ci,
1617 struct ceph_mds_session *session)
1618 __releases(ci->i_ceph_lock)
1619 __acquires(ci->i_ceph_lock)
1620{
1621 struct inode *inode = &ci->netfs.inode;
1622 struct ceph_mds_client *mdsc = session->s_mdsc;
1623 struct ceph_client *cl = mdsc->fsc->client;
1624 struct ceph_cap_snap *capsnap;
1625 u64 oldest_flush_tid = 0;
1626 u64 first_tid = 1, last_tid = 0;
1627
1628 doutc(cl, "%p %llx.%llx session %p\n", inode, ceph_vinop(inode),
1629 session);
1630
1631 list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) {
1632 /*
1633 * we need to wait for sync writes to complete and for dirty
1634 * pages to be written out.
1635 */
1636 if (capsnap->dirty_pages || capsnap->writing)
1637 break;
1638
1639 /* should be removed by ceph_try_drop_cap_snap() */
1640 BUG_ON(!capsnap->need_flush);
1641
1642 /* only flush each capsnap once */
1643 if (capsnap->cap_flush.tid > 0) {
1644 doutc(cl, "already flushed %p, skipping\n", capsnap);
1645 continue;
1646 }
1647
1648 spin_lock(&mdsc->cap_dirty_lock);
1649 capsnap->cap_flush.tid = ++mdsc->last_cap_flush_tid;
1650 list_add_tail(&capsnap->cap_flush.g_list,
1651 &mdsc->cap_flush_list);
1652 if (oldest_flush_tid == 0)
1653 oldest_flush_tid = __get_oldest_flush_tid(mdsc);
1654 if (list_empty(&ci->i_flushing_item)) {
1655 list_add_tail(&ci->i_flushing_item,
1656 &session->s_cap_flushing);
1657 }
1658 spin_unlock(&mdsc->cap_dirty_lock);
1659
1660 list_add_tail(&capsnap->cap_flush.i_list,
1661 &ci->i_cap_flush_list);
1662
1663 if (first_tid == 1)
1664 first_tid = capsnap->cap_flush.tid;
1665 last_tid = capsnap->cap_flush.tid;
1666 }
1667
1668 ci->i_ceph_flags &= ~CEPH_I_FLUSH_SNAPS;
1669
1670 while (first_tid <= last_tid) {
1671 struct ceph_cap *cap = ci->i_auth_cap;
1672 struct ceph_cap_flush *cf = NULL, *iter;
1673 int ret;
1674
1675 if (!(cap && cap->session == session)) {
1676 doutc(cl, "%p %llx.%llx auth cap %p not mds%d, stop\n",
1677 inode, ceph_vinop(inode), cap, session->s_mds);
1678 break;
1679 }
1680
1681 ret = -ENOENT;
1682 list_for_each_entry(iter, &ci->i_cap_flush_list, i_list) {
1683 if (iter->tid >= first_tid) {
1684 cf = iter;
1685 ret = 0;
1686 break;
1687 }
1688 }
1689 if (ret < 0)
1690 break;
1691
1692 first_tid = cf->tid + 1;
1693
1694 capsnap = container_of(cf, struct ceph_cap_snap, cap_flush);
1695 refcount_inc(&capsnap->nref);
1696 spin_unlock(&ci->i_ceph_lock);
1697
1698 doutc(cl, "%p %llx.%llx capsnap %p tid %llu %s\n", inode,
1699 ceph_vinop(inode), capsnap, cf->tid,
1700 ceph_cap_string(capsnap->dirty));
1701
1702 ret = __send_flush_snap(inode, session, capsnap, cap->mseq,
1703 oldest_flush_tid);
1704 if (ret < 0) {
1705 pr_err_client(cl, "error sending cap flushsnap, "
1706 "ino (%llx.%llx) tid %llu follows %llu\n",
1707 ceph_vinop(inode), cf->tid,
1708 capsnap->follows);
1709 }
1710
1711 ceph_put_cap_snap(capsnap);
1712 spin_lock(&ci->i_ceph_lock);
1713 }
1714}
1715
1716void ceph_flush_snaps(struct ceph_inode_info *ci,
1717 struct ceph_mds_session **psession)
1718{
1719 struct inode *inode = &ci->netfs.inode;
1720 struct ceph_mds_client *mdsc = ceph_inode_to_fs_client(inode)->mdsc;
1721 struct ceph_client *cl = ceph_inode_to_client(inode);
1722 struct ceph_mds_session *session = NULL;
1723 bool need_put = false;
1724 int mds;
1725
1726 doutc(cl, "%p %llx.%llx\n", inode, ceph_vinop(inode));
1727 if (psession)
1728 session = *psession;
1729retry:
1730 spin_lock(&ci->i_ceph_lock);
1731 if (!(ci->i_ceph_flags & CEPH_I_FLUSH_SNAPS)) {
1732 doutc(cl, " no capsnap needs flush, doing nothing\n");
1733 goto out;
1734 }
1735 if (!ci->i_auth_cap) {
1736 doutc(cl, " no auth cap (migrating?), doing nothing\n");
1737 goto out;
1738 }
1739
1740 mds = ci->i_auth_cap->session->s_mds;
1741 if (session && session->s_mds != mds) {
1742 doutc(cl, " oops, wrong session %p mutex\n", session);
1743 ceph_put_mds_session(session);
1744 session = NULL;
1745 }
1746 if (!session) {
1747 spin_unlock(&ci->i_ceph_lock);
1748 mutex_lock(&mdsc->mutex);
1749 session = __ceph_lookup_mds_session(mdsc, mds);
1750 mutex_unlock(&mdsc->mutex);
1751 goto retry;
1752 }
1753
1754 // make sure flushsnap messages are sent in proper order.
1755 if (ci->i_ceph_flags & CEPH_I_KICK_FLUSH)
1756 __kick_flushing_caps(mdsc, session, ci, 0);
1757
1758 __ceph_flush_snaps(ci, session);
1759out:
1760 spin_unlock(&ci->i_ceph_lock);
1761
1762 if (psession)
1763 *psession = session;
1764 else
1765 ceph_put_mds_session(session);
1766 /* we flushed them all; remove this inode from the queue */
1767 spin_lock(&mdsc->snap_flush_lock);
1768 if (!list_empty(&ci->i_snap_flush_item))
1769 need_put = true;
1770 list_del_init(&ci->i_snap_flush_item);
1771 spin_unlock(&mdsc->snap_flush_lock);
1772
1773 if (need_put)
1774 iput(inode);
1775}
1776
1777/*
1778 * Mark caps dirty. If inode is newly dirty, return the dirty flags.
1779 * Caller is then responsible for calling __mark_inode_dirty with the
1780 * returned flags value.
1781 */
1782int __ceph_mark_dirty_caps(struct ceph_inode_info *ci, int mask,
1783 struct ceph_cap_flush **pcf)
1784{
1785 struct ceph_mds_client *mdsc =
1786 ceph_sb_to_fs_client(ci->netfs.inode.i_sb)->mdsc;
1787 struct inode *inode = &ci->netfs.inode;
1788 struct ceph_client *cl = ceph_inode_to_client(inode);
1789 int was = ci->i_dirty_caps;
1790 int dirty = 0;
1791
1792 lockdep_assert_held(&ci->i_ceph_lock);
1793
1794 if (!ci->i_auth_cap) {
1795 pr_warn_client(cl, "%p %llx.%llx mask %s, "
1796 "but no auth cap (session was closed?)\n",
1797 inode, ceph_vinop(inode),
1798 ceph_cap_string(mask));
1799 return 0;
1800 }
1801
1802 doutc(cl, "%p %llx.%llx %s dirty %s -> %s\n", inode,
1803 ceph_vinop(inode), ceph_cap_string(mask),
1804 ceph_cap_string(was), ceph_cap_string(was | mask));
1805 ci->i_dirty_caps |= mask;
1806 if (was == 0) {
1807 struct ceph_mds_session *session = ci->i_auth_cap->session;
1808
1809 WARN_ON_ONCE(ci->i_prealloc_cap_flush);
1810 swap(ci->i_prealloc_cap_flush, *pcf);
1811
1812 if (!ci->i_head_snapc) {
1813 WARN_ON_ONCE(!rwsem_is_locked(&mdsc->snap_rwsem));
1814 ci->i_head_snapc = ceph_get_snap_context(
1815 ci->i_snap_realm->cached_context);
1816 }
1817 doutc(cl, "%p %llx.%llx now dirty snapc %p auth cap %p\n",
1818 inode, ceph_vinop(inode), ci->i_head_snapc,
1819 ci->i_auth_cap);
1820 BUG_ON(!list_empty(&ci->i_dirty_item));
1821 spin_lock(&mdsc->cap_dirty_lock);
1822 list_add(&ci->i_dirty_item, &session->s_cap_dirty);
1823 spin_unlock(&mdsc->cap_dirty_lock);
1824 if (ci->i_flushing_caps == 0) {
1825 ihold(inode);
1826 dirty |= I_DIRTY_SYNC;
1827 }
1828 } else {
1829 WARN_ON_ONCE(!ci->i_prealloc_cap_flush);
1830 }
1831 BUG_ON(list_empty(&ci->i_dirty_item));
1832 if (((was | ci->i_flushing_caps) & CEPH_CAP_FILE_BUFFER) &&
1833 (mask & CEPH_CAP_FILE_BUFFER))
1834 dirty |= I_DIRTY_DATASYNC;
1835 __cap_delay_requeue(mdsc, ci);
1836 return dirty;
1837}
1838
1839struct ceph_cap_flush *ceph_alloc_cap_flush(void)
1840{
1841 struct ceph_cap_flush *cf;
1842
1843 cf = kmem_cache_alloc(ceph_cap_flush_cachep, GFP_KERNEL);
1844 if (!cf)
1845 return NULL;
1846
1847 cf->is_capsnap = false;
1848 return cf;
1849}
1850
1851void ceph_free_cap_flush(struct ceph_cap_flush *cf)
1852{
1853 if (cf)
1854 kmem_cache_free(ceph_cap_flush_cachep, cf);
1855}
1856
1857static u64 __get_oldest_flush_tid(struct ceph_mds_client *mdsc)
1858{
1859 if (!list_empty(&mdsc->cap_flush_list)) {
1860 struct ceph_cap_flush *cf =
1861 list_first_entry(&mdsc->cap_flush_list,
1862 struct ceph_cap_flush, g_list);
1863 return cf->tid;
1864 }
1865 return 0;
1866}
1867
1868/*
1869 * Remove cap_flush from the mdsc's or inode's flushing cap list.
1870 * Return true if caller needs to wake up flush waiters.
1871 */
1872static bool __detach_cap_flush_from_mdsc(struct ceph_mds_client *mdsc,
1873 struct ceph_cap_flush *cf)
1874{
1875 struct ceph_cap_flush *prev;
1876 bool wake = cf->wake;
1877
1878 if (wake && cf->g_list.prev != &mdsc->cap_flush_list) {
1879 prev = list_prev_entry(cf, g_list);
1880 prev->wake = true;
1881 wake = false;
1882 }
1883 list_del_init(&cf->g_list);
1884 return wake;
1885}
1886
1887static bool __detach_cap_flush_from_ci(struct ceph_inode_info *ci,
1888 struct ceph_cap_flush *cf)
1889{
1890 struct ceph_cap_flush *prev;
1891 bool wake = cf->wake;
1892
1893 if (wake && cf->i_list.prev != &ci->i_cap_flush_list) {
1894 prev = list_prev_entry(cf, i_list);
1895 prev->wake = true;
1896 wake = false;
1897 }
1898 list_del_init(&cf->i_list);
1899 return wake;
1900}
1901
1902/*
1903 * Add dirty inode to the flushing list. Assigned a seq number so we
1904 * can wait for caps to flush without starving.
1905 *
1906 * Called under i_ceph_lock. Returns the flush tid.
1907 */
1908static u64 __mark_caps_flushing(struct inode *inode,
1909 struct ceph_mds_session *session, bool wake,
1910 u64 *oldest_flush_tid)
1911{
1912 struct ceph_mds_client *mdsc = ceph_sb_to_fs_client(inode->i_sb)->mdsc;
1913 struct ceph_client *cl = ceph_inode_to_client(inode);
1914 struct ceph_inode_info *ci = ceph_inode(inode);
1915 struct ceph_cap_flush *cf = NULL;
1916 int flushing;
1917
1918 lockdep_assert_held(&ci->i_ceph_lock);
1919 BUG_ON(ci->i_dirty_caps == 0);
1920 BUG_ON(list_empty(&ci->i_dirty_item));
1921 BUG_ON(!ci->i_prealloc_cap_flush);
1922
1923 flushing = ci->i_dirty_caps;
1924 doutc(cl, "flushing %s, flushing_caps %s -> %s\n",
1925 ceph_cap_string(flushing),
1926 ceph_cap_string(ci->i_flushing_caps),
1927 ceph_cap_string(ci->i_flushing_caps | flushing));
1928 ci->i_flushing_caps |= flushing;
1929 ci->i_dirty_caps = 0;
1930 doutc(cl, "%p %llx.%llx now !dirty\n", inode, ceph_vinop(inode));
1931
1932 swap(cf, ci->i_prealloc_cap_flush);
1933 cf->caps = flushing;
1934 cf->wake = wake;
1935
1936 spin_lock(&mdsc->cap_dirty_lock);
1937 list_del_init(&ci->i_dirty_item);
1938
1939 cf->tid = ++mdsc->last_cap_flush_tid;
1940 list_add_tail(&cf->g_list, &mdsc->cap_flush_list);
1941 *oldest_flush_tid = __get_oldest_flush_tid(mdsc);
1942
1943 if (list_empty(&ci->i_flushing_item)) {
1944 list_add_tail(&ci->i_flushing_item, &session->s_cap_flushing);
1945 mdsc->num_cap_flushing++;
1946 }
1947 spin_unlock(&mdsc->cap_dirty_lock);
1948
1949 list_add_tail(&cf->i_list, &ci->i_cap_flush_list);
1950
1951 return cf->tid;
1952}
1953
1954/*
1955 * try to invalidate mapping pages without blocking.
1956 */
1957static int try_nonblocking_invalidate(struct inode *inode)
1958 __releases(ci->i_ceph_lock)
1959 __acquires(ci->i_ceph_lock)
1960{
1961 struct ceph_client *cl = ceph_inode_to_client(inode);
1962 struct ceph_inode_info *ci = ceph_inode(inode);
1963 u32 invalidating_gen = ci->i_rdcache_gen;
1964
1965 spin_unlock(&ci->i_ceph_lock);
1966 ceph_fscache_invalidate(inode, false);
1967 invalidate_mapping_pages(&inode->i_data, 0, -1);
1968 spin_lock(&ci->i_ceph_lock);
1969
1970 if (inode->i_data.nrpages == 0 &&
1971 invalidating_gen == ci->i_rdcache_gen) {
1972 /* success. */
1973 doutc(cl, "%p %llx.%llx success\n", inode,
1974 ceph_vinop(inode));
1975 /* save any racing async invalidate some trouble */
1976 ci->i_rdcache_revoking = ci->i_rdcache_gen - 1;
1977 return 0;
1978 }
1979 doutc(cl, "%p %llx.%llx failed\n", inode, ceph_vinop(inode));
1980 return -1;
1981}
1982
1983bool __ceph_should_report_size(struct ceph_inode_info *ci)
1984{
1985 loff_t size = i_size_read(&ci->netfs.inode);
1986 /* mds will adjust max size according to the reported size */
1987 if (ci->i_flushing_caps & CEPH_CAP_FILE_WR)
1988 return false;
1989 if (size >= ci->i_max_size)
1990 return true;
1991 /* half of previous max_size increment has been used */
1992 if (ci->i_max_size > ci->i_reported_size &&
1993 (size << 1) >= ci->i_max_size + ci->i_reported_size)
1994 return true;
1995 return false;
1996}
1997
1998/*
1999 * Swiss army knife function to examine currently used and wanted
2000 * versus held caps. Release, flush, ack revoked caps to mds as
2001 * appropriate.
2002 *
2003 * CHECK_CAPS_AUTHONLY - we should only check the auth cap
2004 * CHECK_CAPS_FLUSH - we should flush any dirty caps immediately, without
2005 * further delay.
2006 * CHECK_CAPS_FLUSH_FORCE - we should flush any caps immediately, without
2007 * further delay.
2008 */
2009void ceph_check_caps(struct ceph_inode_info *ci, int flags)
2010{
2011 struct inode *inode = &ci->netfs.inode;
2012 struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(inode->i_sb);
2013 struct ceph_client *cl = ceph_inode_to_client(inode);
2014 struct ceph_cap *cap;
2015 u64 flush_tid, oldest_flush_tid;
2016 int file_wanted, used, cap_used;
2017 int issued, implemented, want, retain, revoking, flushing = 0;
2018 int mds = -1; /* keep track of how far we've gone through i_caps list
2019 to avoid an infinite loop on retry */
2020 struct rb_node *p;
2021 bool queue_invalidate = false;
2022 bool tried_invalidate = false;
2023 bool queue_writeback = false;
2024 struct ceph_mds_session *session = NULL;
2025
2026 spin_lock(&ci->i_ceph_lock);
2027 if (ci->i_ceph_flags & CEPH_I_ASYNC_CREATE) {
2028 ci->i_ceph_flags |= CEPH_I_ASYNC_CHECK_CAPS;
2029
2030 /* Don't send messages until we get async create reply */
2031 spin_unlock(&ci->i_ceph_lock);
2032 return;
2033 }
2034
2035 if (ci->i_ceph_flags & CEPH_I_FLUSH)
2036 flags |= CHECK_CAPS_FLUSH;
2037retry:
2038 /* Caps wanted by virtue of active open files. */
2039 file_wanted = __ceph_caps_file_wanted(ci);
2040
2041 /* Caps which have active references against them */
2042 used = __ceph_caps_used(ci);
2043
2044 /*
2045 * "issued" represents the current caps that the MDS wants us to have.
2046 * "implemented" is the set that we have been granted, and includes the
2047 * ones that have not yet been returned to the MDS (the "revoking" set,
2048 * usually because they have outstanding references).
2049 */
2050 issued = __ceph_caps_issued(ci, &implemented);
2051 revoking = implemented & ~issued;
2052
2053 want = file_wanted;
2054
2055 /* The ones we currently want to retain (may be adjusted below) */
2056 retain = file_wanted | used | CEPH_CAP_PIN;
2057 if (!mdsc->stopping && inode->i_nlink > 0) {
2058 if (file_wanted) {
2059 retain |= CEPH_CAP_ANY; /* be greedy */
2060 } else if (S_ISDIR(inode->i_mode) &&
2061 (issued & CEPH_CAP_FILE_SHARED) &&
2062 __ceph_dir_is_complete(ci)) {
2063 /*
2064 * If a directory is complete, we want to keep
2065 * the exclusive cap. So that MDS does not end up
2066 * revoking the shared cap on every create/unlink
2067 * operation.
2068 */
2069 if (IS_RDONLY(inode)) {
2070 want = CEPH_CAP_ANY_SHARED;
2071 } else {
2072 want |= CEPH_CAP_ANY_SHARED | CEPH_CAP_FILE_EXCL;
2073 }
2074 retain |= want;
2075 } else {
2076
2077 retain |= CEPH_CAP_ANY_SHARED;
2078 /*
2079 * keep RD only if we didn't have the file open RW,
2080 * because then the mds would revoke it anyway to
2081 * journal max_size=0.
2082 */
2083 if (ci->i_max_size == 0)
2084 retain |= CEPH_CAP_ANY_RD;
2085 }
2086 }
2087
2088 doutc(cl, "%p %llx.%llx file_want %s used %s dirty %s "
2089 "flushing %s issued %s revoking %s retain %s %s%s%s%s\n",
2090 inode, ceph_vinop(inode), ceph_cap_string(file_wanted),
2091 ceph_cap_string(used), ceph_cap_string(ci->i_dirty_caps),
2092 ceph_cap_string(ci->i_flushing_caps),
2093 ceph_cap_string(issued), ceph_cap_string(revoking),
2094 ceph_cap_string(retain),
2095 (flags & CHECK_CAPS_AUTHONLY) ? " AUTHONLY" : "",
2096 (flags & CHECK_CAPS_FLUSH) ? " FLUSH" : "",
2097 (flags & CHECK_CAPS_NOINVAL) ? " NOINVAL" : "",
2098 (flags & CHECK_CAPS_FLUSH_FORCE) ? " FLUSH_FORCE" : "");
2099
2100 /*
2101 * If we no longer need to hold onto old our caps, and we may
2102 * have cached pages, but don't want them, then try to invalidate.
2103 * If we fail, it's because pages are locked.... try again later.
2104 */
2105 if ((!(flags & CHECK_CAPS_NOINVAL) || mdsc->stopping) &&
2106 S_ISREG(inode->i_mode) &&
2107 !(ci->i_wb_ref || ci->i_wrbuffer_ref) && /* no dirty pages... */
2108 inode->i_data.nrpages && /* have cached pages */
2109 (revoking & (CEPH_CAP_FILE_CACHE|
2110 CEPH_CAP_FILE_LAZYIO)) && /* or revoking cache */
2111 !tried_invalidate) {
2112 doutc(cl, "trying to invalidate on %p %llx.%llx\n",
2113 inode, ceph_vinop(inode));
2114 if (try_nonblocking_invalidate(inode) < 0) {
2115 doutc(cl, "queuing invalidate\n");
2116 queue_invalidate = true;
2117 ci->i_rdcache_revoking = ci->i_rdcache_gen;
2118 }
2119 tried_invalidate = true;
2120 goto retry;
2121 }
2122
2123 for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
2124 int mflags = 0;
2125 struct cap_msg_args arg;
2126
2127 cap = rb_entry(p, struct ceph_cap, ci_node);
2128
2129 /* avoid looping forever */
2130 if (mds >= cap->mds ||
2131 ((flags & CHECK_CAPS_AUTHONLY) && cap != ci->i_auth_cap))
2132 continue;
2133
2134 /*
2135 * If we have an auth cap, we don't need to consider any
2136 * overlapping caps as used.
2137 */
2138 cap_used = used;
2139 if (ci->i_auth_cap && cap != ci->i_auth_cap)
2140 cap_used &= ~ci->i_auth_cap->issued;
2141
2142 revoking = cap->implemented & ~cap->issued;
2143 doutc(cl, " mds%d cap %p used %s issued %s implemented %s revoking %s\n",
2144 cap->mds, cap, ceph_cap_string(cap_used),
2145 ceph_cap_string(cap->issued),
2146 ceph_cap_string(cap->implemented),
2147 ceph_cap_string(revoking));
2148
2149 /* completed revocation? going down and there are no caps? */
2150 if (revoking) {
2151 if ((revoking & cap_used) == 0) {
2152 doutc(cl, "completed revocation of %s\n",
2153 ceph_cap_string(cap->implemented & ~cap->issued));
2154 goto ack;
2155 }
2156
2157 /*
2158 * If the "i_wrbuffer_ref" was increased by mmap or generic
2159 * cache write just before the ceph_check_caps() is called,
2160 * the Fb capability revoking will fail this time. Then we
2161 * must wait for the BDI's delayed work to flush the dirty
2162 * pages and to release the "i_wrbuffer_ref", which will cost
2163 * at most 5 seconds. That means the MDS needs to wait at
2164 * most 5 seconds to finished the Fb capability's revocation.
2165 *
2166 * Let's queue a writeback for it.
2167 */
2168 if (S_ISREG(inode->i_mode) && ci->i_wrbuffer_ref &&
2169 (revoking & CEPH_CAP_FILE_BUFFER))
2170 queue_writeback = true;
2171 }
2172
2173 if (flags & CHECK_CAPS_FLUSH_FORCE) {
2174 doutc(cl, "force to flush caps\n");
2175 goto ack;
2176 }
2177
2178 if (cap == ci->i_auth_cap &&
2179 (cap->issued & CEPH_CAP_FILE_WR)) {
2180 /* request larger max_size from MDS? */
2181 if (ci->i_wanted_max_size > ci->i_max_size &&
2182 ci->i_wanted_max_size > ci->i_requested_max_size) {
2183 doutc(cl, "requesting new max_size\n");
2184 goto ack;
2185 }
2186
2187 /* approaching file_max? */
2188 if (__ceph_should_report_size(ci)) {
2189 doutc(cl, "i_size approaching max_size\n");
2190 goto ack;
2191 }
2192 }
2193 /* flush anything dirty? */
2194 if (cap == ci->i_auth_cap) {
2195 if ((flags & CHECK_CAPS_FLUSH) && ci->i_dirty_caps) {
2196 doutc(cl, "flushing dirty caps\n");
2197 goto ack;
2198 }
2199 if (ci->i_ceph_flags & CEPH_I_FLUSH_SNAPS) {
2200 doutc(cl, "flushing snap caps\n");
2201 goto ack;
2202 }
2203 }
2204
2205 /* want more caps from mds? */
2206 if (want & ~cap->mds_wanted) {
2207 if (want & ~(cap->mds_wanted | cap->issued))
2208 goto ack;
2209 if (!__cap_is_valid(cap))
2210 goto ack;
2211 }
2212
2213 /* things we might delay */
2214 if ((cap->issued & ~retain) == 0)
2215 continue; /* nope, all good */
2216
2217ack:
2218 ceph_put_mds_session(session);
2219 session = ceph_get_mds_session(cap->session);
2220
2221 /* kick flushing and flush snaps before sending normal
2222 * cap message */
2223 if (cap == ci->i_auth_cap &&
2224 (ci->i_ceph_flags &
2225 (CEPH_I_KICK_FLUSH | CEPH_I_FLUSH_SNAPS))) {
2226 if (ci->i_ceph_flags & CEPH_I_KICK_FLUSH)
2227 __kick_flushing_caps(mdsc, session, ci, 0);
2228 if (ci->i_ceph_flags & CEPH_I_FLUSH_SNAPS)
2229 __ceph_flush_snaps(ci, session);
2230
2231 goto retry;
2232 }
2233
2234 if (cap == ci->i_auth_cap && ci->i_dirty_caps) {
2235 flushing = ci->i_dirty_caps;
2236 flush_tid = __mark_caps_flushing(inode, session, false,
2237 &oldest_flush_tid);
2238 if (flags & CHECK_CAPS_FLUSH &&
2239 list_empty(&session->s_cap_dirty))
2240 mflags |= CEPH_CLIENT_CAPS_SYNC;
2241 } else {
2242 flushing = 0;
2243 flush_tid = 0;
2244 spin_lock(&mdsc->cap_dirty_lock);
2245 oldest_flush_tid = __get_oldest_flush_tid(mdsc);
2246 spin_unlock(&mdsc->cap_dirty_lock);
2247 }
2248
2249 mds = cap->mds; /* remember mds, so we don't repeat */
2250
2251 __prep_cap(&arg, cap, CEPH_CAP_OP_UPDATE, mflags, cap_used,
2252 want, retain, flushing, flush_tid, oldest_flush_tid);
2253
2254 spin_unlock(&ci->i_ceph_lock);
2255 __send_cap(&arg, ci);
2256 spin_lock(&ci->i_ceph_lock);
2257
2258 goto retry; /* retake i_ceph_lock and restart our cap scan. */
2259 }
2260
2261 /* periodically re-calculate caps wanted by open files */
2262 if (__ceph_is_any_real_caps(ci) &&
2263 list_empty(&ci->i_cap_delay_list) &&
2264 (file_wanted & ~CEPH_CAP_PIN) &&
2265 !(used & (CEPH_CAP_FILE_RD | CEPH_CAP_ANY_FILE_WR))) {
2266 __cap_delay_requeue(mdsc, ci);
2267 }
2268
2269 spin_unlock(&ci->i_ceph_lock);
2270
2271 ceph_put_mds_session(session);
2272 if (queue_writeback)
2273 ceph_queue_writeback(inode);
2274 if (queue_invalidate)
2275 ceph_queue_invalidate(inode);
2276}
2277
2278/*
2279 * Try to flush dirty caps back to the auth mds.
2280 */
2281static int try_flush_caps(struct inode *inode, u64 *ptid)
2282{
2283 struct ceph_mds_client *mdsc = ceph_sb_to_fs_client(inode->i_sb)->mdsc;
2284 struct ceph_inode_info *ci = ceph_inode(inode);
2285 int flushing = 0;
2286 u64 flush_tid = 0, oldest_flush_tid = 0;
2287
2288 spin_lock(&ci->i_ceph_lock);
2289retry_locked:
2290 if (ci->i_dirty_caps && ci->i_auth_cap) {
2291 struct ceph_cap *cap = ci->i_auth_cap;
2292 struct cap_msg_args arg;
2293 struct ceph_mds_session *session = cap->session;
2294
2295 if (session->s_state < CEPH_MDS_SESSION_OPEN) {
2296 spin_unlock(&ci->i_ceph_lock);
2297 goto out;
2298 }
2299
2300 if (ci->i_ceph_flags &
2301 (CEPH_I_KICK_FLUSH | CEPH_I_FLUSH_SNAPS)) {
2302 if (ci->i_ceph_flags & CEPH_I_KICK_FLUSH)
2303 __kick_flushing_caps(mdsc, session, ci, 0);
2304 if (ci->i_ceph_flags & CEPH_I_FLUSH_SNAPS)
2305 __ceph_flush_snaps(ci, session);
2306 goto retry_locked;
2307 }
2308
2309 flushing = ci->i_dirty_caps;
2310 flush_tid = __mark_caps_flushing(inode, session, true,
2311 &oldest_flush_tid);
2312
2313 __prep_cap(&arg, cap, CEPH_CAP_OP_FLUSH, CEPH_CLIENT_CAPS_SYNC,
2314 __ceph_caps_used(ci), __ceph_caps_wanted(ci),
2315 (cap->issued | cap->implemented),
2316 flushing, flush_tid, oldest_flush_tid);
2317 spin_unlock(&ci->i_ceph_lock);
2318
2319 __send_cap(&arg, ci);
2320 } else {
2321 if (!list_empty(&ci->i_cap_flush_list)) {
2322 struct ceph_cap_flush *cf =
2323 list_last_entry(&ci->i_cap_flush_list,
2324 struct ceph_cap_flush, i_list);
2325 cf->wake = true;
2326 flush_tid = cf->tid;
2327 }
2328 flushing = ci->i_flushing_caps;
2329 spin_unlock(&ci->i_ceph_lock);
2330 }
2331out:
2332 *ptid = flush_tid;
2333 return flushing;
2334}
2335
2336/*
2337 * Return true if we've flushed caps through the given flush_tid.
2338 */
2339static int caps_are_flushed(struct inode *inode, u64 flush_tid)
2340{
2341 struct ceph_inode_info *ci = ceph_inode(inode);
2342 int ret = 1;
2343
2344 spin_lock(&ci->i_ceph_lock);
2345 if (!list_empty(&ci->i_cap_flush_list)) {
2346 struct ceph_cap_flush * cf =
2347 list_first_entry(&ci->i_cap_flush_list,
2348 struct ceph_cap_flush, i_list);
2349 if (cf->tid <= flush_tid)
2350 ret = 0;
2351 }
2352 spin_unlock(&ci->i_ceph_lock);
2353 return ret;
2354}
2355
2356/*
2357 * flush the mdlog and wait for any unsafe requests to complete.
2358 */
2359static int flush_mdlog_and_wait_inode_unsafe_requests(struct inode *inode)
2360{
2361 struct ceph_mds_client *mdsc = ceph_sb_to_fs_client(inode->i_sb)->mdsc;
2362 struct ceph_client *cl = ceph_inode_to_client(inode);
2363 struct ceph_inode_info *ci = ceph_inode(inode);
2364 struct ceph_mds_request *req1 = NULL, *req2 = NULL;
2365 int ret, err = 0;
2366
2367 spin_lock(&ci->i_unsafe_lock);
2368 if (S_ISDIR(inode->i_mode) && !list_empty(&ci->i_unsafe_dirops)) {
2369 req1 = list_last_entry(&ci->i_unsafe_dirops,
2370 struct ceph_mds_request,
2371 r_unsafe_dir_item);
2372 ceph_mdsc_get_request(req1);
2373 }
2374 if (!list_empty(&ci->i_unsafe_iops)) {
2375 req2 = list_last_entry(&ci->i_unsafe_iops,
2376 struct ceph_mds_request,
2377 r_unsafe_target_item);
2378 ceph_mdsc_get_request(req2);
2379 }
2380 spin_unlock(&ci->i_unsafe_lock);
2381
2382 /*
2383 * Trigger to flush the journal logs in all the relevant MDSes
2384 * manually, or in the worst case we must wait at most 5 seconds
2385 * to wait the journal logs to be flushed by the MDSes periodically.
2386 */
2387 if (req1 || req2) {
2388 struct ceph_mds_request *req;
2389 struct ceph_mds_session **sessions;
2390 struct ceph_mds_session *s;
2391 unsigned int max_sessions;
2392 int i;
2393
2394 mutex_lock(&mdsc->mutex);
2395 max_sessions = mdsc->max_sessions;
2396
2397 sessions = kcalloc(max_sessions, sizeof(s), GFP_KERNEL);
2398 if (!sessions) {
2399 mutex_unlock(&mdsc->mutex);
2400 err = -ENOMEM;
2401 goto out;
2402 }
2403
2404 spin_lock(&ci->i_unsafe_lock);
2405 if (req1) {
2406 list_for_each_entry(req, &ci->i_unsafe_dirops,
2407 r_unsafe_dir_item) {
2408 s = req->r_session;
2409 if (!s)
2410 continue;
2411 if (!sessions[s->s_mds]) {
2412 s = ceph_get_mds_session(s);
2413 sessions[s->s_mds] = s;
2414 }
2415 }
2416 }
2417 if (req2) {
2418 list_for_each_entry(req, &ci->i_unsafe_iops,
2419 r_unsafe_target_item) {
2420 s = req->r_session;
2421 if (!s)
2422 continue;
2423 if (!sessions[s->s_mds]) {
2424 s = ceph_get_mds_session(s);
2425 sessions[s->s_mds] = s;
2426 }
2427 }
2428 }
2429 spin_unlock(&ci->i_unsafe_lock);
2430
2431 /* the auth MDS */
2432 spin_lock(&ci->i_ceph_lock);
2433 if (ci->i_auth_cap) {
2434 s = ci->i_auth_cap->session;
2435 if (!sessions[s->s_mds])
2436 sessions[s->s_mds] = ceph_get_mds_session(s);
2437 }
2438 spin_unlock(&ci->i_ceph_lock);
2439 mutex_unlock(&mdsc->mutex);
2440
2441 /* send flush mdlog request to MDSes */
2442 for (i = 0; i < max_sessions; i++) {
2443 s = sessions[i];
2444 if (s) {
2445 send_flush_mdlog(s);
2446 ceph_put_mds_session(s);
2447 }
2448 }
2449 kfree(sessions);
2450 }
2451
2452 doutc(cl, "%p %llx.%llx wait on tid %llu %llu\n", inode,
2453 ceph_vinop(inode), req1 ? req1->r_tid : 0ULL,
2454 req2 ? req2->r_tid : 0ULL);
2455 if (req1) {
2456 ret = !wait_for_completion_timeout(&req1->r_safe_completion,
2457 ceph_timeout_jiffies(req1->r_timeout));
2458 if (ret)
2459 err = -EIO;
2460 }
2461 if (req2) {
2462 ret = !wait_for_completion_timeout(&req2->r_safe_completion,
2463 ceph_timeout_jiffies(req2->r_timeout));
2464 if (ret)
2465 err = -EIO;
2466 }
2467
2468out:
2469 if (req1)
2470 ceph_mdsc_put_request(req1);
2471 if (req2)
2472 ceph_mdsc_put_request(req2);
2473 return err;
2474}
2475
2476int ceph_fsync(struct file *file, loff_t start, loff_t end, int datasync)
2477{
2478 struct inode *inode = file->f_mapping->host;
2479 struct ceph_inode_info *ci = ceph_inode(inode);
2480 struct ceph_client *cl = ceph_inode_to_client(inode);
2481 u64 flush_tid;
2482 int ret, err;
2483 int dirty;
2484
2485 doutc(cl, "%p %llx.%llx%s\n", inode, ceph_vinop(inode),
2486 datasync ? " datasync" : "");
2487
2488 ret = file_write_and_wait_range(file, start, end);
2489 if (datasync)
2490 goto out;
2491
2492 ret = ceph_wait_on_async_create(inode);
2493 if (ret)
2494 goto out;
2495
2496 dirty = try_flush_caps(inode, &flush_tid);
2497 doutc(cl, "dirty caps are %s\n", ceph_cap_string(dirty));
2498
2499 err = flush_mdlog_and_wait_inode_unsafe_requests(inode);
2500
2501 /*
2502 * only wait on non-file metadata writeback (the mds
2503 * can recover size and mtime, so we don't need to
2504 * wait for that)
2505 */
2506 if (!err && (dirty & ~CEPH_CAP_ANY_FILE_WR)) {
2507 err = wait_event_interruptible(ci->i_cap_wq,
2508 caps_are_flushed(inode, flush_tid));
2509 }
2510
2511 if (err < 0)
2512 ret = err;
2513
2514 err = file_check_and_advance_wb_err(file);
2515 if (err < 0)
2516 ret = err;
2517out:
2518 doutc(cl, "%p %llx.%llx%s result=%d\n", inode, ceph_vinop(inode),
2519 datasync ? " datasync" : "", ret);
2520 return ret;
2521}
2522
2523/*
2524 * Flush any dirty caps back to the mds. If we aren't asked to wait,
2525 * queue inode for flush but don't do so immediately, because we can
2526 * get by with fewer MDS messages if we wait for data writeback to
2527 * complete first.
2528 */
2529int ceph_write_inode(struct inode *inode, struct writeback_control *wbc)
2530{
2531 struct ceph_inode_info *ci = ceph_inode(inode);
2532 struct ceph_client *cl = ceph_inode_to_client(inode);
2533 u64 flush_tid;
2534 int err = 0;
2535 int dirty;
2536 int wait = (wbc->sync_mode == WB_SYNC_ALL && !wbc->for_sync);
2537
2538 doutc(cl, "%p %llx.%llx wait=%d\n", inode, ceph_vinop(inode), wait);
2539 ceph_fscache_unpin_writeback(inode, wbc);
2540 if (wait) {
2541 err = ceph_wait_on_async_create(inode);
2542 if (err)
2543 return err;
2544 dirty = try_flush_caps(inode, &flush_tid);
2545 if (dirty)
2546 err = wait_event_interruptible(ci->i_cap_wq,
2547 caps_are_flushed(inode, flush_tid));
2548 } else {
2549 struct ceph_mds_client *mdsc =
2550 ceph_sb_to_fs_client(inode->i_sb)->mdsc;
2551
2552 spin_lock(&ci->i_ceph_lock);
2553 if (__ceph_caps_dirty(ci))
2554 __cap_delay_requeue_front(mdsc, ci);
2555 spin_unlock(&ci->i_ceph_lock);
2556 }
2557 return err;
2558}
2559
2560static void __kick_flushing_caps(struct ceph_mds_client *mdsc,
2561 struct ceph_mds_session *session,
2562 struct ceph_inode_info *ci,
2563 u64 oldest_flush_tid)
2564 __releases(ci->i_ceph_lock)
2565 __acquires(ci->i_ceph_lock)
2566{
2567 struct inode *inode = &ci->netfs.inode;
2568 struct ceph_client *cl = mdsc->fsc->client;
2569 struct ceph_cap *cap;
2570 struct ceph_cap_flush *cf;
2571 int ret;
2572 u64 first_tid = 0;
2573 u64 last_snap_flush = 0;
2574
2575 /* Don't do anything until create reply comes in */
2576 if (ci->i_ceph_flags & CEPH_I_ASYNC_CREATE)
2577 return;
2578
2579 ci->i_ceph_flags &= ~CEPH_I_KICK_FLUSH;
2580
2581 list_for_each_entry_reverse(cf, &ci->i_cap_flush_list, i_list) {
2582 if (cf->is_capsnap) {
2583 last_snap_flush = cf->tid;
2584 break;
2585 }
2586 }
2587
2588 list_for_each_entry(cf, &ci->i_cap_flush_list, i_list) {
2589 if (cf->tid < first_tid)
2590 continue;
2591
2592 cap = ci->i_auth_cap;
2593 if (!(cap && cap->session == session)) {
2594 pr_err_client(cl, "%p auth cap %p not mds%d ???\n",
2595 inode, cap, session->s_mds);
2596 break;
2597 }
2598
2599 first_tid = cf->tid + 1;
2600
2601 if (!cf->is_capsnap) {
2602 struct cap_msg_args arg;
2603
2604 doutc(cl, "%p %llx.%llx cap %p tid %llu %s\n",
2605 inode, ceph_vinop(inode), cap, cf->tid,
2606 ceph_cap_string(cf->caps));
2607 __prep_cap(&arg, cap, CEPH_CAP_OP_FLUSH,
2608 (cf->tid < last_snap_flush ?
2609 CEPH_CLIENT_CAPS_PENDING_CAPSNAP : 0),
2610 __ceph_caps_used(ci),
2611 __ceph_caps_wanted(ci),
2612 (cap->issued | cap->implemented),
2613 cf->caps, cf->tid, oldest_flush_tid);
2614 spin_unlock(&ci->i_ceph_lock);
2615 __send_cap(&arg, ci);
2616 } else {
2617 struct ceph_cap_snap *capsnap =
2618 container_of(cf, struct ceph_cap_snap,
2619 cap_flush);
2620 doutc(cl, "%p %llx.%llx capsnap %p tid %llu %s\n",
2621 inode, ceph_vinop(inode), capsnap, cf->tid,
2622 ceph_cap_string(capsnap->dirty));
2623
2624 refcount_inc(&capsnap->nref);
2625 spin_unlock(&ci->i_ceph_lock);
2626
2627 ret = __send_flush_snap(inode, session, capsnap, cap->mseq,
2628 oldest_flush_tid);
2629 if (ret < 0) {
2630 pr_err_client(cl, "error sending cap flushsnap,"
2631 " %p %llx.%llx tid %llu follows %llu\n",
2632 inode, ceph_vinop(inode), cf->tid,
2633 capsnap->follows);
2634 }
2635
2636 ceph_put_cap_snap(capsnap);
2637 }
2638
2639 spin_lock(&ci->i_ceph_lock);
2640 }
2641}
2642
2643void ceph_early_kick_flushing_caps(struct ceph_mds_client *mdsc,
2644 struct ceph_mds_session *session)
2645{
2646 struct ceph_client *cl = mdsc->fsc->client;
2647 struct ceph_inode_info *ci;
2648 struct ceph_cap *cap;
2649 u64 oldest_flush_tid;
2650
2651 doutc(cl, "mds%d\n", session->s_mds);
2652
2653 spin_lock(&mdsc->cap_dirty_lock);
2654 oldest_flush_tid = __get_oldest_flush_tid(mdsc);
2655 spin_unlock(&mdsc->cap_dirty_lock);
2656
2657 list_for_each_entry(ci, &session->s_cap_flushing, i_flushing_item) {
2658 struct inode *inode = &ci->netfs.inode;
2659
2660 spin_lock(&ci->i_ceph_lock);
2661 cap = ci->i_auth_cap;
2662 if (!(cap && cap->session == session)) {
2663 pr_err_client(cl, "%p %llx.%llx auth cap %p not mds%d ???\n",
2664 inode, ceph_vinop(inode), cap,
2665 session->s_mds);
2666 spin_unlock(&ci->i_ceph_lock);
2667 continue;
2668 }
2669
2670
2671 /*
2672 * if flushing caps were revoked, we re-send the cap flush
2673 * in client reconnect stage. This guarantees MDS * processes
2674 * the cap flush message before issuing the flushing caps to
2675 * other client.
2676 */
2677 if ((cap->issued & ci->i_flushing_caps) !=
2678 ci->i_flushing_caps) {
2679 /* encode_caps_cb() also will reset these sequence
2680 * numbers. make sure sequence numbers in cap flush
2681 * message match later reconnect message */
2682 cap->seq = 0;
2683 cap->issue_seq = 0;
2684 cap->mseq = 0;
2685 __kick_flushing_caps(mdsc, session, ci,
2686 oldest_flush_tid);
2687 } else {
2688 ci->i_ceph_flags |= CEPH_I_KICK_FLUSH;
2689 }
2690
2691 spin_unlock(&ci->i_ceph_lock);
2692 }
2693}
2694
2695void ceph_kick_flushing_caps(struct ceph_mds_client *mdsc,
2696 struct ceph_mds_session *session)
2697{
2698 struct ceph_client *cl = mdsc->fsc->client;
2699 struct ceph_inode_info *ci;
2700 struct ceph_cap *cap;
2701 u64 oldest_flush_tid;
2702
2703 lockdep_assert_held(&session->s_mutex);
2704
2705 doutc(cl, "mds%d\n", session->s_mds);
2706
2707 spin_lock(&mdsc->cap_dirty_lock);
2708 oldest_flush_tid = __get_oldest_flush_tid(mdsc);
2709 spin_unlock(&mdsc->cap_dirty_lock);
2710
2711 list_for_each_entry(ci, &session->s_cap_flushing, i_flushing_item) {
2712 struct inode *inode = &ci->netfs.inode;
2713
2714 spin_lock(&ci->i_ceph_lock);
2715 cap = ci->i_auth_cap;
2716 if (!(cap && cap->session == session)) {
2717 pr_err_client(cl, "%p %llx.%llx auth cap %p not mds%d ???\n",
2718 inode, ceph_vinop(inode), cap,
2719 session->s_mds);
2720 spin_unlock(&ci->i_ceph_lock);
2721 continue;
2722 }
2723 if (ci->i_ceph_flags & CEPH_I_KICK_FLUSH) {
2724 __kick_flushing_caps(mdsc, session, ci,
2725 oldest_flush_tid);
2726 }
2727 spin_unlock(&ci->i_ceph_lock);
2728 }
2729}
2730
2731void ceph_kick_flushing_inode_caps(struct ceph_mds_session *session,
2732 struct ceph_inode_info *ci)
2733{
2734 struct ceph_mds_client *mdsc = session->s_mdsc;
2735 struct ceph_cap *cap = ci->i_auth_cap;
2736 struct inode *inode = &ci->netfs.inode;
2737
2738 lockdep_assert_held(&ci->i_ceph_lock);
2739
2740 doutc(mdsc->fsc->client, "%p %llx.%llx flushing %s\n",
2741 inode, ceph_vinop(inode),
2742 ceph_cap_string(ci->i_flushing_caps));
2743
2744 if (!list_empty(&ci->i_cap_flush_list)) {
2745 u64 oldest_flush_tid;
2746 spin_lock(&mdsc->cap_dirty_lock);
2747 list_move_tail(&ci->i_flushing_item,
2748 &cap->session->s_cap_flushing);
2749 oldest_flush_tid = __get_oldest_flush_tid(mdsc);
2750 spin_unlock(&mdsc->cap_dirty_lock);
2751
2752 __kick_flushing_caps(mdsc, session, ci, oldest_flush_tid);
2753 }
2754}
2755
2756
2757/*
2758 * Take references to capabilities we hold, so that we don't release
2759 * them to the MDS prematurely.
2760 */
2761void ceph_take_cap_refs(struct ceph_inode_info *ci, int got,
2762 bool snap_rwsem_locked)
2763{
2764 struct inode *inode = &ci->netfs.inode;
2765 struct ceph_client *cl = ceph_inode_to_client(inode);
2766
2767 lockdep_assert_held(&ci->i_ceph_lock);
2768
2769 if (got & CEPH_CAP_PIN)
2770 ci->i_pin_ref++;
2771 if (got & CEPH_CAP_FILE_RD)
2772 ci->i_rd_ref++;
2773 if (got & CEPH_CAP_FILE_CACHE)
2774 ci->i_rdcache_ref++;
2775 if (got & CEPH_CAP_FILE_EXCL)
2776 ci->i_fx_ref++;
2777 if (got & CEPH_CAP_FILE_WR) {
2778 if (ci->i_wr_ref == 0 && !ci->i_head_snapc) {
2779 BUG_ON(!snap_rwsem_locked);
2780 ci->i_head_snapc = ceph_get_snap_context(
2781 ci->i_snap_realm->cached_context);
2782 }
2783 ci->i_wr_ref++;
2784 }
2785 if (got & CEPH_CAP_FILE_BUFFER) {
2786 if (ci->i_wb_ref == 0)
2787 ihold(inode);
2788 ci->i_wb_ref++;
2789 doutc(cl, "%p %llx.%llx wb %d -> %d (?)\n", inode,
2790 ceph_vinop(inode), ci->i_wb_ref-1, ci->i_wb_ref);
2791 }
2792}
2793
2794/*
2795 * Try to grab cap references. Specify those refs we @want, and the
2796 * minimal set we @need. Also include the larger offset we are writing
2797 * to (when applicable), and check against max_size here as well.
2798 * Note that caller is responsible for ensuring max_size increases are
2799 * requested from the MDS.
2800 *
2801 * Returns 0 if caps were not able to be acquired (yet), 1 if succeed,
2802 * or a negative error code. There are 3 special error codes:
2803 * -EAGAIN: need to sleep but non-blocking is specified
2804 * -EFBIG: ask caller to call check_max_size() and try again.
2805 * -EUCLEAN: ask caller to call ceph_renew_caps() and try again.
2806 */
2807enum {
2808 /* first 8 bits are reserved for CEPH_FILE_MODE_FOO */
2809 NON_BLOCKING = (1 << 8),
2810 CHECK_FILELOCK = (1 << 9),
2811};
2812
2813static int try_get_cap_refs(struct inode *inode, int need, int want,
2814 loff_t endoff, int flags, int *got)
2815{
2816 struct ceph_inode_info *ci = ceph_inode(inode);
2817 struct ceph_mds_client *mdsc = ceph_inode_to_fs_client(inode)->mdsc;
2818 struct ceph_client *cl = ceph_inode_to_client(inode);
2819 int ret = 0;
2820 int have, implemented;
2821 bool snap_rwsem_locked = false;
2822
2823 doutc(cl, "%p %llx.%llx need %s want %s\n", inode,
2824 ceph_vinop(inode), ceph_cap_string(need),
2825 ceph_cap_string(want));
2826
2827again:
2828 spin_lock(&ci->i_ceph_lock);
2829
2830 if ((flags & CHECK_FILELOCK) &&
2831 (ci->i_ceph_flags & CEPH_I_ERROR_FILELOCK)) {
2832 doutc(cl, "%p %llx.%llx error filelock\n", inode,
2833 ceph_vinop(inode));
2834 ret = -EIO;
2835 goto out_unlock;
2836 }
2837
2838 /* finish pending truncate */
2839 while (ci->i_truncate_pending) {
2840 spin_unlock(&ci->i_ceph_lock);
2841 if (snap_rwsem_locked) {
2842 up_read(&mdsc->snap_rwsem);
2843 snap_rwsem_locked = false;
2844 }
2845 __ceph_do_pending_vmtruncate(inode);
2846 spin_lock(&ci->i_ceph_lock);
2847 }
2848
2849 have = __ceph_caps_issued(ci, &implemented);
2850
2851 if (have & need & CEPH_CAP_FILE_WR) {
2852 if (endoff >= 0 && endoff > (loff_t)ci->i_max_size) {
2853 doutc(cl, "%p %llx.%llx endoff %llu > maxsize %llu\n",
2854 inode, ceph_vinop(inode), endoff, ci->i_max_size);
2855 if (endoff > ci->i_requested_max_size)
2856 ret = ci->i_auth_cap ? -EFBIG : -EUCLEAN;
2857 goto out_unlock;
2858 }
2859 /*
2860 * If a sync write is in progress, we must wait, so that we
2861 * can get a final snapshot value for size+mtime.
2862 */
2863 if (__ceph_have_pending_cap_snap(ci)) {
2864 doutc(cl, "%p %llx.%llx cap_snap_pending\n", inode,
2865 ceph_vinop(inode));
2866 goto out_unlock;
2867 }
2868 }
2869
2870 if ((have & need) == need) {
2871 /*
2872 * Look at (implemented & ~have & not) so that we keep waiting
2873 * on transition from wanted -> needed caps. This is needed
2874 * for WRBUFFER|WR -> WR to avoid a new WR sync write from
2875 * going before a prior buffered writeback happens.
2876 *
2877 * For RDCACHE|RD -> RD, there is not need to wait and we can
2878 * just exclude the revoking caps and force to sync read.
2879 */
2880 int not = want & ~(have & need);
2881 int revoking = implemented & ~have;
2882 int exclude = revoking & not;
2883 doutc(cl, "%p %llx.%llx have %s but not %s (revoking %s)\n",
2884 inode, ceph_vinop(inode), ceph_cap_string(have),
2885 ceph_cap_string(not), ceph_cap_string(revoking));
2886 if (!exclude || !(exclude & CEPH_CAP_FILE_BUFFER)) {
2887 if (!snap_rwsem_locked &&
2888 !ci->i_head_snapc &&
2889 (need & CEPH_CAP_FILE_WR)) {
2890 if (!down_read_trylock(&mdsc->snap_rwsem)) {
2891 /*
2892 * we can not call down_read() when
2893 * task isn't in TASK_RUNNING state
2894 */
2895 if (flags & NON_BLOCKING) {
2896 ret = -EAGAIN;
2897 goto out_unlock;
2898 }
2899
2900 spin_unlock(&ci->i_ceph_lock);
2901 down_read(&mdsc->snap_rwsem);
2902 snap_rwsem_locked = true;
2903 goto again;
2904 }
2905 snap_rwsem_locked = true;
2906 }
2907 if ((have & want) == want)
2908 *got = need | (want & ~exclude);
2909 else
2910 *got = need;
2911 ceph_take_cap_refs(ci, *got, true);
2912 ret = 1;
2913 }
2914 } else {
2915 int session_readonly = false;
2916 int mds_wanted;
2917 if (ci->i_auth_cap &&
2918 (need & (CEPH_CAP_FILE_WR | CEPH_CAP_FILE_EXCL))) {
2919 struct ceph_mds_session *s = ci->i_auth_cap->session;
2920 spin_lock(&s->s_cap_lock);
2921 session_readonly = s->s_readonly;
2922 spin_unlock(&s->s_cap_lock);
2923 }
2924 if (session_readonly) {
2925 doutc(cl, "%p %llx.%llx need %s but mds%d readonly\n",
2926 inode, ceph_vinop(inode), ceph_cap_string(need),
2927 ci->i_auth_cap->mds);
2928 ret = -EROFS;
2929 goto out_unlock;
2930 }
2931
2932 if (ceph_inode_is_shutdown(inode)) {
2933 doutc(cl, "%p %llx.%llx inode is shutdown\n",
2934 inode, ceph_vinop(inode));
2935 ret = -ESTALE;
2936 goto out_unlock;
2937 }
2938 mds_wanted = __ceph_caps_mds_wanted(ci, false);
2939 if (need & ~mds_wanted) {
2940 doutc(cl, "%p %llx.%llx need %s > mds_wanted %s\n",
2941 inode, ceph_vinop(inode), ceph_cap_string(need),
2942 ceph_cap_string(mds_wanted));
2943 ret = -EUCLEAN;
2944 goto out_unlock;
2945 }
2946
2947 doutc(cl, "%p %llx.%llx have %s need %s\n", inode,
2948 ceph_vinop(inode), ceph_cap_string(have),
2949 ceph_cap_string(need));
2950 }
2951out_unlock:
2952
2953 __ceph_touch_fmode(ci, mdsc, flags);
2954
2955 spin_unlock(&ci->i_ceph_lock);
2956 if (snap_rwsem_locked)
2957 up_read(&mdsc->snap_rwsem);
2958
2959 if (!ret)
2960 ceph_update_cap_mis(&mdsc->metric);
2961 else if (ret == 1)
2962 ceph_update_cap_hit(&mdsc->metric);
2963
2964 doutc(cl, "%p %llx.%llx ret %d got %s\n", inode,
2965 ceph_vinop(inode), ret, ceph_cap_string(*got));
2966 return ret;
2967}
2968
2969/*
2970 * Check the offset we are writing up to against our current
2971 * max_size. If necessary, tell the MDS we want to write to
2972 * a larger offset.
2973 */
2974static void check_max_size(struct inode *inode, loff_t endoff)
2975{
2976 struct ceph_inode_info *ci = ceph_inode(inode);
2977 struct ceph_client *cl = ceph_inode_to_client(inode);
2978 int check = 0;
2979
2980 /* do we need to explicitly request a larger max_size? */
2981 spin_lock(&ci->i_ceph_lock);
2982 if (endoff >= ci->i_max_size && endoff > ci->i_wanted_max_size) {
2983 doutc(cl, "write %p %llx.%llx at large endoff %llu, req max_size\n",
2984 inode, ceph_vinop(inode), endoff);
2985 ci->i_wanted_max_size = endoff;
2986 }
2987 /* duplicate ceph_check_caps()'s logic */
2988 if (ci->i_auth_cap &&
2989 (ci->i_auth_cap->issued & CEPH_CAP_FILE_WR) &&
2990 ci->i_wanted_max_size > ci->i_max_size &&
2991 ci->i_wanted_max_size > ci->i_requested_max_size)
2992 check = 1;
2993 spin_unlock(&ci->i_ceph_lock);
2994 if (check)
2995 ceph_check_caps(ci, CHECK_CAPS_AUTHONLY);
2996}
2997
2998static inline int get_used_fmode(int caps)
2999{
3000 int fmode = 0;
3001 if (caps & CEPH_CAP_FILE_RD)
3002 fmode |= CEPH_FILE_MODE_RD;
3003 if (caps & CEPH_CAP_FILE_WR)
3004 fmode |= CEPH_FILE_MODE_WR;
3005 return fmode;
3006}
3007
3008int ceph_try_get_caps(struct inode *inode, int need, int want,
3009 bool nonblock, int *got)
3010{
3011 int ret, flags;
3012
3013 BUG_ON(need & ~CEPH_CAP_FILE_RD);
3014 BUG_ON(want & ~(CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO |
3015 CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_EXCL |
3016 CEPH_CAP_ANY_DIR_OPS));
3017 if (need) {
3018 ret = ceph_pool_perm_check(inode, need);
3019 if (ret < 0)
3020 return ret;
3021 }
3022
3023 flags = get_used_fmode(need | want);
3024 if (nonblock)
3025 flags |= NON_BLOCKING;
3026
3027 ret = try_get_cap_refs(inode, need, want, 0, flags, got);
3028 /* three special error codes */
3029 if (ret == -EAGAIN || ret == -EFBIG || ret == -EUCLEAN)
3030 ret = 0;
3031 return ret;
3032}
3033
3034/*
3035 * Wait for caps, and take cap references. If we can't get a WR cap
3036 * due to a small max_size, make sure we check_max_size (and possibly
3037 * ask the mds) so we don't get hung up indefinitely.
3038 */
3039int __ceph_get_caps(struct inode *inode, struct ceph_file_info *fi, int need,
3040 int want, loff_t endoff, int *got)
3041{
3042 struct ceph_inode_info *ci = ceph_inode(inode);
3043 struct ceph_fs_client *fsc = ceph_inode_to_fs_client(inode);
3044 int ret, _got, flags;
3045
3046 ret = ceph_pool_perm_check(inode, need);
3047 if (ret < 0)
3048 return ret;
3049
3050 if (fi && (fi->fmode & CEPH_FILE_MODE_WR) &&
3051 fi->filp_gen != READ_ONCE(fsc->filp_gen))
3052 return -EBADF;
3053
3054 flags = get_used_fmode(need | want);
3055
3056 while (true) {
3057 flags &= CEPH_FILE_MODE_MASK;
3058 if (vfs_inode_has_locks(inode))
3059 flags |= CHECK_FILELOCK;
3060 _got = 0;
3061 ret = try_get_cap_refs(inode, need, want, endoff,
3062 flags, &_got);
3063 WARN_ON_ONCE(ret == -EAGAIN);
3064 if (!ret) {
3065#ifdef CONFIG_DEBUG_FS
3066 struct ceph_mds_client *mdsc = fsc->mdsc;
3067 struct cap_wait cw;
3068#endif
3069 DEFINE_WAIT_FUNC(wait, woken_wake_function);
3070
3071#ifdef CONFIG_DEBUG_FS
3072 cw.ino = ceph_ino(inode);
3073 cw.tgid = current->tgid;
3074 cw.need = need;
3075 cw.want = want;
3076
3077 spin_lock(&mdsc->caps_list_lock);
3078 list_add(&cw.list, &mdsc->cap_wait_list);
3079 spin_unlock(&mdsc->caps_list_lock);
3080#endif
3081
3082 /* make sure used fmode not timeout */
3083 ceph_get_fmode(ci, flags, FMODE_WAIT_BIAS);
3084 add_wait_queue(&ci->i_cap_wq, &wait);
3085
3086 flags |= NON_BLOCKING;
3087 while (!(ret = try_get_cap_refs(inode, need, want,
3088 endoff, flags, &_got))) {
3089 if (signal_pending(current)) {
3090 ret = -ERESTARTSYS;
3091 break;
3092 }
3093 wait_woken(&wait, TASK_INTERRUPTIBLE, MAX_SCHEDULE_TIMEOUT);
3094 }
3095
3096 remove_wait_queue(&ci->i_cap_wq, &wait);
3097 ceph_put_fmode(ci, flags, FMODE_WAIT_BIAS);
3098
3099#ifdef CONFIG_DEBUG_FS
3100 spin_lock(&mdsc->caps_list_lock);
3101 list_del(&cw.list);
3102 spin_unlock(&mdsc->caps_list_lock);
3103#endif
3104
3105 if (ret == -EAGAIN)
3106 continue;
3107 }
3108
3109 if (fi && (fi->fmode & CEPH_FILE_MODE_WR) &&
3110 fi->filp_gen != READ_ONCE(fsc->filp_gen)) {
3111 if (ret >= 0 && _got)
3112 ceph_put_cap_refs(ci, _got);
3113 return -EBADF;
3114 }
3115
3116 if (ret < 0) {
3117 if (ret == -EFBIG || ret == -EUCLEAN) {
3118 int ret2 = ceph_wait_on_async_create(inode);
3119 if (ret2 < 0)
3120 return ret2;
3121 }
3122 if (ret == -EFBIG) {
3123 check_max_size(inode, endoff);
3124 continue;
3125 }
3126 if (ret == -EUCLEAN) {
3127 /* session was killed, try renew caps */
3128 ret = ceph_renew_caps(inode, flags);
3129 if (ret == 0)
3130 continue;
3131 }
3132 return ret;
3133 }
3134
3135 if (S_ISREG(ci->netfs.inode.i_mode) &&
3136 ceph_has_inline_data(ci) &&
3137 (_got & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) &&
3138 i_size_read(inode) > 0) {
3139 struct page *page =
3140 find_get_page(inode->i_mapping, 0);
3141 if (page) {
3142 bool uptodate = PageUptodate(page);
3143
3144 put_page(page);
3145 if (uptodate)
3146 break;
3147 }
3148 /*
3149 * drop cap refs first because getattr while
3150 * holding * caps refs can cause deadlock.
3151 */
3152 ceph_put_cap_refs(ci, _got);
3153 _got = 0;
3154
3155 /*
3156 * getattr request will bring inline data into
3157 * page cache
3158 */
3159 ret = __ceph_do_getattr(inode, NULL,
3160 CEPH_STAT_CAP_INLINE_DATA,
3161 true);
3162 if (ret < 0)
3163 return ret;
3164 continue;
3165 }
3166 break;
3167 }
3168 *got = _got;
3169 return 0;
3170}
3171
3172int ceph_get_caps(struct file *filp, int need, int want, loff_t endoff,
3173 int *got)
3174{
3175 struct ceph_file_info *fi = filp->private_data;
3176 struct inode *inode = file_inode(filp);
3177
3178 return __ceph_get_caps(inode, fi, need, want, endoff, got);
3179}
3180
3181/*
3182 * Take cap refs. Caller must already know we hold at least one ref
3183 * on the caps in question or we don't know this is safe.
3184 */
3185void ceph_get_cap_refs(struct ceph_inode_info *ci, int caps)
3186{
3187 spin_lock(&ci->i_ceph_lock);
3188 ceph_take_cap_refs(ci, caps, false);
3189 spin_unlock(&ci->i_ceph_lock);
3190}
3191
3192
3193/*
3194 * drop cap_snap that is not associated with any snapshot.
3195 * we don't need to send FLUSHSNAP message for it.
3196 */
3197static int ceph_try_drop_cap_snap(struct ceph_inode_info *ci,
3198 struct ceph_cap_snap *capsnap)
3199{
3200 struct inode *inode = &ci->netfs.inode;
3201 struct ceph_client *cl = ceph_inode_to_client(inode);
3202
3203 if (!capsnap->need_flush &&
3204 !capsnap->writing && !capsnap->dirty_pages) {
3205 doutc(cl, "%p follows %llu\n", capsnap, capsnap->follows);
3206 BUG_ON(capsnap->cap_flush.tid > 0);
3207 ceph_put_snap_context(capsnap->context);
3208 if (!list_is_last(&capsnap->ci_item, &ci->i_cap_snaps))
3209 ci->i_ceph_flags |= CEPH_I_FLUSH_SNAPS;
3210
3211 list_del(&capsnap->ci_item);
3212 ceph_put_cap_snap(capsnap);
3213 return 1;
3214 }
3215 return 0;
3216}
3217
3218enum put_cap_refs_mode {
3219 PUT_CAP_REFS_SYNC = 0,
3220 PUT_CAP_REFS_ASYNC,
3221};
3222
3223/*
3224 * Release cap refs.
3225 *
3226 * If we released the last ref on any given cap, call ceph_check_caps
3227 * to release (or schedule a release).
3228 *
3229 * If we are releasing a WR cap (from a sync write), finalize any affected
3230 * cap_snap, and wake up any waiters.
3231 */
3232static void __ceph_put_cap_refs(struct ceph_inode_info *ci, int had,
3233 enum put_cap_refs_mode mode)
3234{
3235 struct inode *inode = &ci->netfs.inode;
3236 struct ceph_client *cl = ceph_inode_to_client(inode);
3237 int last = 0, put = 0, flushsnaps = 0, wake = 0;
3238 bool check_flushsnaps = false;
3239
3240 spin_lock(&ci->i_ceph_lock);
3241 if (had & CEPH_CAP_PIN)
3242 --ci->i_pin_ref;
3243 if (had & CEPH_CAP_FILE_RD)
3244 if (--ci->i_rd_ref == 0)
3245 last++;
3246 if (had & CEPH_CAP_FILE_CACHE)
3247 if (--ci->i_rdcache_ref == 0)
3248 last++;
3249 if (had & CEPH_CAP_FILE_EXCL)
3250 if (--ci->i_fx_ref == 0)
3251 last++;
3252 if (had & CEPH_CAP_FILE_BUFFER) {
3253 if (--ci->i_wb_ref == 0) {
3254 last++;
3255 /* put the ref held by ceph_take_cap_refs() */
3256 put++;
3257 check_flushsnaps = true;
3258 }
3259 doutc(cl, "%p %llx.%llx wb %d -> %d (?)\n", inode,
3260 ceph_vinop(inode), ci->i_wb_ref+1, ci->i_wb_ref);
3261 }
3262 if (had & CEPH_CAP_FILE_WR) {
3263 if (--ci->i_wr_ref == 0) {
3264 /*
3265 * The Fb caps will always be took and released
3266 * together with the Fw caps.
3267 */
3268 WARN_ON_ONCE(ci->i_wb_ref);
3269
3270 last++;
3271 check_flushsnaps = true;
3272 if (ci->i_wrbuffer_ref_head == 0 &&
3273 ci->i_dirty_caps == 0 &&
3274 ci->i_flushing_caps == 0) {
3275 BUG_ON(!ci->i_head_snapc);
3276 ceph_put_snap_context(ci->i_head_snapc);
3277 ci->i_head_snapc = NULL;
3278 }
3279 /* see comment in __ceph_remove_cap() */
3280 if (!__ceph_is_any_real_caps(ci) && ci->i_snap_realm)
3281 ceph_change_snap_realm(inode, NULL);
3282 }
3283 }
3284 if (check_flushsnaps && __ceph_have_pending_cap_snap(ci)) {
3285 struct ceph_cap_snap *capsnap =
3286 list_last_entry(&ci->i_cap_snaps,
3287 struct ceph_cap_snap,
3288 ci_item);
3289
3290 capsnap->writing = 0;
3291 if (ceph_try_drop_cap_snap(ci, capsnap))
3292 /* put the ref held by ceph_queue_cap_snap() */
3293 put++;
3294 else if (__ceph_finish_cap_snap(ci, capsnap))
3295 flushsnaps = 1;
3296 wake = 1;
3297 }
3298 spin_unlock(&ci->i_ceph_lock);
3299
3300 doutc(cl, "%p %llx.%llx had %s%s%s\n", inode, ceph_vinop(inode),
3301 ceph_cap_string(had), last ? " last" : "", put ? " put" : "");
3302
3303 switch (mode) {
3304 case PUT_CAP_REFS_SYNC:
3305 if (last)
3306 ceph_check_caps(ci, 0);
3307 else if (flushsnaps)
3308 ceph_flush_snaps(ci, NULL);
3309 break;
3310 case PUT_CAP_REFS_ASYNC:
3311 if (last)
3312 ceph_queue_check_caps(inode);
3313 else if (flushsnaps)
3314 ceph_queue_flush_snaps(inode);
3315 break;
3316 default:
3317 break;
3318 }
3319 if (wake)
3320 wake_up_all(&ci->i_cap_wq);
3321 while (put-- > 0)
3322 iput(inode);
3323}
3324
3325void ceph_put_cap_refs(struct ceph_inode_info *ci, int had)
3326{
3327 __ceph_put_cap_refs(ci, had, PUT_CAP_REFS_SYNC);
3328}
3329
3330void ceph_put_cap_refs_async(struct ceph_inode_info *ci, int had)
3331{
3332 __ceph_put_cap_refs(ci, had, PUT_CAP_REFS_ASYNC);
3333}
3334
3335/*
3336 * Release @nr WRBUFFER refs on dirty pages for the given @snapc snap
3337 * context. Adjust per-snap dirty page accounting as appropriate.
3338 * Once all dirty data for a cap_snap is flushed, flush snapped file
3339 * metadata back to the MDS. If we dropped the last ref, call
3340 * ceph_check_caps.
3341 */
3342void ceph_put_wrbuffer_cap_refs(struct ceph_inode_info *ci, int nr,
3343 struct ceph_snap_context *snapc)
3344{
3345 struct inode *inode = &ci->netfs.inode;
3346 struct ceph_client *cl = ceph_inode_to_client(inode);
3347 struct ceph_cap_snap *capsnap = NULL, *iter;
3348 int put = 0;
3349 bool last = false;
3350 bool flush_snaps = false;
3351 bool complete_capsnap = false;
3352
3353 spin_lock(&ci->i_ceph_lock);
3354 ci->i_wrbuffer_ref -= nr;
3355 if (ci->i_wrbuffer_ref == 0) {
3356 last = true;
3357 put++;
3358 }
3359
3360 if (ci->i_head_snapc == snapc) {
3361 ci->i_wrbuffer_ref_head -= nr;
3362 if (ci->i_wrbuffer_ref_head == 0 &&
3363 ci->i_wr_ref == 0 &&
3364 ci->i_dirty_caps == 0 &&
3365 ci->i_flushing_caps == 0) {
3366 BUG_ON(!ci->i_head_snapc);
3367 ceph_put_snap_context(ci->i_head_snapc);
3368 ci->i_head_snapc = NULL;
3369 }
3370 doutc(cl, "on %p %llx.%llx head %d/%d -> %d/%d %s\n",
3371 inode, ceph_vinop(inode), ci->i_wrbuffer_ref+nr,
3372 ci->i_wrbuffer_ref_head+nr, ci->i_wrbuffer_ref,
3373 ci->i_wrbuffer_ref_head, last ? " LAST" : "");
3374 } else {
3375 list_for_each_entry(iter, &ci->i_cap_snaps, ci_item) {
3376 if (iter->context == snapc) {
3377 capsnap = iter;
3378 break;
3379 }
3380 }
3381
3382 if (!capsnap) {
3383 /*
3384 * The capsnap should already be removed when removing
3385 * auth cap in the case of a forced unmount.
3386 */
3387 WARN_ON_ONCE(ci->i_auth_cap);
3388 goto unlock;
3389 }
3390
3391 capsnap->dirty_pages -= nr;
3392 if (capsnap->dirty_pages == 0) {
3393 complete_capsnap = true;
3394 if (!capsnap->writing) {
3395 if (ceph_try_drop_cap_snap(ci, capsnap)) {
3396 put++;
3397 } else {
3398 ci->i_ceph_flags |= CEPH_I_FLUSH_SNAPS;
3399 flush_snaps = true;
3400 }
3401 }
3402 }
3403 doutc(cl, "%p %llx.%llx cap_snap %p snap %lld %d/%d -> %d/%d %s%s\n",
3404 inode, ceph_vinop(inode), capsnap, capsnap->context->seq,
3405 ci->i_wrbuffer_ref+nr, capsnap->dirty_pages + nr,
3406 ci->i_wrbuffer_ref, capsnap->dirty_pages,
3407 last ? " (wrbuffer last)" : "",
3408 complete_capsnap ? " (complete capsnap)" : "");
3409 }
3410
3411unlock:
3412 spin_unlock(&ci->i_ceph_lock);
3413
3414 if (last) {
3415 ceph_check_caps(ci, 0);
3416 } else if (flush_snaps) {
3417 ceph_flush_snaps(ci, NULL);
3418 }
3419 if (complete_capsnap)
3420 wake_up_all(&ci->i_cap_wq);
3421 while (put-- > 0) {
3422 iput(inode);
3423 }
3424}
3425
3426/*
3427 * Invalidate unlinked inode's aliases, so we can drop the inode ASAP.
3428 */
3429static void invalidate_aliases(struct inode *inode)
3430{
3431 struct ceph_client *cl = ceph_inode_to_client(inode);
3432 struct dentry *dn, *prev = NULL;
3433
3434 doutc(cl, "%p %llx.%llx\n", inode, ceph_vinop(inode));
3435 d_prune_aliases(inode);
3436 /*
3437 * For non-directory inode, d_find_alias() only returns
3438 * hashed dentry. After calling d_invalidate(), the
3439 * dentry becomes unhashed.
3440 *
3441 * For directory inode, d_find_alias() can return
3442 * unhashed dentry. But directory inode should have
3443 * one alias at most.
3444 */
3445 while ((dn = d_find_alias(inode))) {
3446 if (dn == prev) {
3447 dput(dn);
3448 break;
3449 }
3450 d_invalidate(dn);
3451 if (prev)
3452 dput(prev);
3453 prev = dn;
3454 }
3455 if (prev)
3456 dput(prev);
3457}
3458
3459struct cap_extra_info {
3460 struct ceph_string *pool_ns;
3461 /* inline data */
3462 u64 inline_version;
3463 void *inline_data;
3464 u32 inline_len;
3465 /* dirstat */
3466 bool dirstat_valid;
3467 u64 nfiles;
3468 u64 nsubdirs;
3469 u64 change_attr;
3470 /* currently issued */
3471 int issued;
3472 struct timespec64 btime;
3473 u8 *fscrypt_auth;
3474 u32 fscrypt_auth_len;
3475 u64 fscrypt_file_size;
3476};
3477
3478/*
3479 * Handle a cap GRANT message from the MDS. (Note that a GRANT may
3480 * actually be a revocation if it specifies a smaller cap set.)
3481 *
3482 * caller holds s_mutex and i_ceph_lock, we drop both.
3483 */
3484static void handle_cap_grant(struct inode *inode,
3485 struct ceph_mds_session *session,
3486 struct ceph_cap *cap,
3487 struct ceph_mds_caps *grant,
3488 struct ceph_buffer *xattr_buf,
3489 struct cap_extra_info *extra_info)
3490 __releases(ci->i_ceph_lock)
3491 __releases(session->s_mdsc->snap_rwsem)
3492{
3493 struct ceph_client *cl = ceph_inode_to_client(inode);
3494 struct ceph_inode_info *ci = ceph_inode(inode);
3495 int seq = le32_to_cpu(grant->seq);
3496 int newcaps = le32_to_cpu(grant->caps);
3497 int used, wanted, dirty;
3498 u64 size = le64_to_cpu(grant->size);
3499 u64 max_size = le64_to_cpu(grant->max_size);
3500 unsigned char check_caps = 0;
3501 bool was_stale = cap->cap_gen < atomic_read(&session->s_cap_gen);
3502 bool wake = false;
3503 bool writeback = false;
3504 bool queue_trunc = false;
3505 bool queue_invalidate = false;
3506 bool deleted_inode = false;
3507 bool fill_inline = false;
3508 bool revoke_wait = false;
3509 int flags = 0;
3510
3511 /*
3512 * If there is at least one crypto block then we'll trust
3513 * fscrypt_file_size. If the real length of the file is 0, then
3514 * ignore it (it has probably been truncated down to 0 by the MDS).
3515 */
3516 if (IS_ENCRYPTED(inode) && size)
3517 size = extra_info->fscrypt_file_size;
3518
3519 doutc(cl, "%p %llx.%llx cap %p mds%d seq %d %s\n", inode,
3520 ceph_vinop(inode), cap, session->s_mds, seq,
3521 ceph_cap_string(newcaps));
3522 doutc(cl, " size %llu max_size %llu, i_size %llu\n", size,
3523 max_size, i_size_read(inode));
3524
3525
3526 /*
3527 * If CACHE is being revoked, and we have no dirty buffers,
3528 * try to invalidate (once). (If there are dirty buffers, we
3529 * will invalidate _after_ writeback.)
3530 */
3531 if (S_ISREG(inode->i_mode) && /* don't invalidate readdir cache */
3532 ((cap->issued & ~newcaps) & CEPH_CAP_FILE_CACHE) &&
3533 (newcaps & CEPH_CAP_FILE_LAZYIO) == 0 &&
3534 !(ci->i_wrbuffer_ref || ci->i_wb_ref)) {
3535 if (try_nonblocking_invalidate(inode)) {
3536 /* there were locked pages.. invalidate later
3537 in a separate thread. */
3538 if (ci->i_rdcache_revoking != ci->i_rdcache_gen) {
3539 queue_invalidate = true;
3540 ci->i_rdcache_revoking = ci->i_rdcache_gen;
3541 }
3542 }
3543 }
3544
3545 if (was_stale)
3546 cap->issued = cap->implemented = CEPH_CAP_PIN;
3547
3548 /*
3549 * auth mds of the inode changed. we received the cap export message,
3550 * but still haven't received the cap import message. handle_cap_export
3551 * updated the new auth MDS' cap.
3552 *
3553 * "ceph_seq_cmp(seq, cap->seq) <= 0" means we are processing a message
3554 * that was sent before the cap import message. So don't remove caps.
3555 */
3556 if (ceph_seq_cmp(seq, cap->seq) <= 0) {
3557 WARN_ON(cap != ci->i_auth_cap);
3558 WARN_ON(cap->cap_id != le64_to_cpu(grant->cap_id));
3559 seq = cap->seq;
3560 newcaps |= cap->issued;
3561 }
3562
3563 /* side effects now are allowed */
3564 cap->cap_gen = atomic_read(&session->s_cap_gen);
3565 cap->seq = seq;
3566
3567 __check_cap_issue(ci, cap, newcaps);
3568
3569 inode_set_max_iversion_raw(inode, extra_info->change_attr);
3570
3571 if ((newcaps & CEPH_CAP_AUTH_SHARED) &&
3572 (extra_info->issued & CEPH_CAP_AUTH_EXCL) == 0) {
3573 umode_t mode = le32_to_cpu(grant->mode);
3574
3575 if (inode_wrong_type(inode, mode))
3576 pr_warn_once("inode type changed! (ino %llx.%llx is 0%o, mds says 0%o)\n",
3577 ceph_vinop(inode), inode->i_mode, mode);
3578 else
3579 inode->i_mode = mode;
3580 inode->i_uid = make_kuid(&init_user_ns, le32_to_cpu(grant->uid));
3581 inode->i_gid = make_kgid(&init_user_ns, le32_to_cpu(grant->gid));
3582 ci->i_btime = extra_info->btime;
3583 doutc(cl, "%p %llx.%llx mode 0%o uid.gid %d.%d\n", inode,
3584 ceph_vinop(inode), inode->i_mode,
3585 from_kuid(&init_user_ns, inode->i_uid),
3586 from_kgid(&init_user_ns, inode->i_gid));
3587#if IS_ENABLED(CONFIG_FS_ENCRYPTION)
3588 if (ci->fscrypt_auth_len != extra_info->fscrypt_auth_len ||
3589 memcmp(ci->fscrypt_auth, extra_info->fscrypt_auth,
3590 ci->fscrypt_auth_len))
3591 pr_warn_ratelimited_client(cl,
3592 "cap grant attempt to change fscrypt_auth on non-I_NEW inode (old len %d new len %d)\n",
3593 ci->fscrypt_auth_len,
3594 extra_info->fscrypt_auth_len);
3595#endif
3596 }
3597
3598 if ((newcaps & CEPH_CAP_LINK_SHARED) &&
3599 (extra_info->issued & CEPH_CAP_LINK_EXCL) == 0) {
3600 set_nlink(inode, le32_to_cpu(grant->nlink));
3601 if (inode->i_nlink == 0)
3602 deleted_inode = true;
3603 }
3604
3605 if ((extra_info->issued & CEPH_CAP_XATTR_EXCL) == 0 &&
3606 grant->xattr_len) {
3607 int len = le32_to_cpu(grant->xattr_len);
3608 u64 version = le64_to_cpu(grant->xattr_version);
3609
3610 if (version > ci->i_xattrs.version) {
3611 doutc(cl, " got new xattrs v%llu on %p %llx.%llx len %d\n",
3612 version, inode, ceph_vinop(inode), len);
3613 if (ci->i_xattrs.blob)
3614 ceph_buffer_put(ci->i_xattrs.blob);
3615 ci->i_xattrs.blob = ceph_buffer_get(xattr_buf);
3616 ci->i_xattrs.version = version;
3617 ceph_forget_all_cached_acls(inode);
3618 ceph_security_invalidate_secctx(inode);
3619 }
3620 }
3621
3622 if (newcaps & CEPH_CAP_ANY_RD) {
3623 struct timespec64 mtime, atime, ctime;
3624 /* ctime/mtime/atime? */
3625 ceph_decode_timespec64(&mtime, &grant->mtime);
3626 ceph_decode_timespec64(&atime, &grant->atime);
3627 ceph_decode_timespec64(&ctime, &grant->ctime);
3628 ceph_fill_file_time(inode, extra_info->issued,
3629 le32_to_cpu(grant->time_warp_seq),
3630 &ctime, &mtime, &atime);
3631 }
3632
3633 if ((newcaps & CEPH_CAP_FILE_SHARED) && extra_info->dirstat_valid) {
3634 ci->i_files = extra_info->nfiles;
3635 ci->i_subdirs = extra_info->nsubdirs;
3636 }
3637
3638 if (newcaps & (CEPH_CAP_ANY_FILE_RD | CEPH_CAP_ANY_FILE_WR)) {
3639 /* file layout may have changed */
3640 s64 old_pool = ci->i_layout.pool_id;
3641 struct ceph_string *old_ns;
3642
3643 ceph_file_layout_from_legacy(&ci->i_layout, &grant->layout);
3644 old_ns = rcu_dereference_protected(ci->i_layout.pool_ns,
3645 lockdep_is_held(&ci->i_ceph_lock));
3646 rcu_assign_pointer(ci->i_layout.pool_ns, extra_info->pool_ns);
3647
3648 if (ci->i_layout.pool_id != old_pool ||
3649 extra_info->pool_ns != old_ns)
3650 ci->i_ceph_flags &= ~CEPH_I_POOL_PERM;
3651
3652 extra_info->pool_ns = old_ns;
3653
3654 /* size/truncate_seq? */
3655 queue_trunc = ceph_fill_file_size(inode, extra_info->issued,
3656 le32_to_cpu(grant->truncate_seq),
3657 le64_to_cpu(grant->truncate_size),
3658 size);
3659 }
3660
3661 if (ci->i_auth_cap == cap && (newcaps & CEPH_CAP_ANY_FILE_WR)) {
3662 if (max_size != ci->i_max_size) {
3663 doutc(cl, "max_size %lld -> %llu\n", ci->i_max_size,
3664 max_size);
3665 ci->i_max_size = max_size;
3666 if (max_size >= ci->i_wanted_max_size) {
3667 ci->i_wanted_max_size = 0; /* reset */
3668 ci->i_requested_max_size = 0;
3669 }
3670 wake = true;
3671 }
3672 }
3673
3674 /* check cap bits */
3675 wanted = __ceph_caps_wanted(ci);
3676 used = __ceph_caps_used(ci);
3677 dirty = __ceph_caps_dirty(ci);
3678 doutc(cl, " my wanted = %s, used = %s, dirty %s\n",
3679 ceph_cap_string(wanted), ceph_cap_string(used),
3680 ceph_cap_string(dirty));
3681
3682 if ((was_stale || le32_to_cpu(grant->op) == CEPH_CAP_OP_IMPORT) &&
3683 (wanted & ~(cap->mds_wanted | newcaps))) {
3684 /*
3685 * If mds is importing cap, prior cap messages that update
3686 * 'wanted' may get dropped by mds (migrate seq mismatch).
3687 *
3688 * We don't send cap message to update 'wanted' if what we
3689 * want are already issued. If mds revokes caps, cap message
3690 * that releases caps also tells mds what we want. But if
3691 * caps got revoked by mds forcedly (session stale). We may
3692 * haven't told mds what we want.
3693 */
3694 check_caps = 1;
3695 }
3696
3697 /* revocation, grant, or no-op? */
3698 if (cap->issued & ~newcaps) {
3699 int revoking = cap->issued & ~newcaps;
3700
3701 doutc(cl, "revocation: %s -> %s (revoking %s)\n",
3702 ceph_cap_string(cap->issued), ceph_cap_string(newcaps),
3703 ceph_cap_string(revoking));
3704 if (S_ISREG(inode->i_mode) &&
3705 (revoking & used & CEPH_CAP_FILE_BUFFER)) {
3706 writeback = true; /* initiate writeback; will delay ack */
3707 revoke_wait = true;
3708 } else if (queue_invalidate &&
3709 revoking == CEPH_CAP_FILE_CACHE &&
3710 (newcaps & CEPH_CAP_FILE_LAZYIO) == 0) {
3711 revoke_wait = true; /* do nothing yet, invalidation will be queued */
3712 } else if (cap == ci->i_auth_cap) {
3713 check_caps = 1; /* check auth cap only */
3714 } else {
3715 check_caps = 2; /* check all caps */
3716 }
3717 /* If there is new caps, try to wake up the waiters */
3718 if (~cap->issued & newcaps)
3719 wake = true;
3720 cap->issued = newcaps;
3721 cap->implemented |= newcaps;
3722 } else if (cap->issued == newcaps) {
3723 doutc(cl, "caps unchanged: %s -> %s\n",
3724 ceph_cap_string(cap->issued),
3725 ceph_cap_string(newcaps));
3726 } else {
3727 doutc(cl, "grant: %s -> %s\n", ceph_cap_string(cap->issued),
3728 ceph_cap_string(newcaps));
3729 /* non-auth MDS is revoking the newly grant caps ? */
3730 if (cap == ci->i_auth_cap &&
3731 __ceph_caps_revoking_other(ci, cap, newcaps))
3732 check_caps = 2;
3733
3734 cap->issued = newcaps;
3735 cap->implemented |= newcaps; /* add bits only, to
3736 * avoid stepping on a
3737 * pending revocation */
3738 wake = true;
3739 }
3740 BUG_ON(cap->issued & ~cap->implemented);
3741
3742 /* don't let check_caps skip sending a response to MDS for revoke msgs */
3743 if (!revoke_wait && le32_to_cpu(grant->op) == CEPH_CAP_OP_REVOKE) {
3744 cap->mds_wanted = 0;
3745 flags |= CHECK_CAPS_FLUSH_FORCE;
3746 if (cap == ci->i_auth_cap)
3747 check_caps = 1; /* check auth cap only */
3748 else
3749 check_caps = 2; /* check all caps */
3750 }
3751
3752 if (extra_info->inline_version > 0 &&
3753 extra_info->inline_version >= ci->i_inline_version) {
3754 ci->i_inline_version = extra_info->inline_version;
3755 if (ci->i_inline_version != CEPH_INLINE_NONE &&
3756 (newcaps & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)))
3757 fill_inline = true;
3758 }
3759
3760 if (le32_to_cpu(grant->op) == CEPH_CAP_OP_IMPORT) {
3761 if (ci->i_auth_cap == cap) {
3762 if (newcaps & ~extra_info->issued)
3763 wake = true;
3764
3765 if (ci->i_requested_max_size > max_size ||
3766 !(le32_to_cpu(grant->wanted) & CEPH_CAP_ANY_FILE_WR)) {
3767 /* re-request max_size if necessary */
3768 ci->i_requested_max_size = 0;
3769 wake = true;
3770 }
3771
3772 ceph_kick_flushing_inode_caps(session, ci);
3773 }
3774 up_read(&session->s_mdsc->snap_rwsem);
3775 }
3776 spin_unlock(&ci->i_ceph_lock);
3777
3778 if (fill_inline)
3779 ceph_fill_inline_data(inode, NULL, extra_info->inline_data,
3780 extra_info->inline_len);
3781
3782 if (queue_trunc)
3783 ceph_queue_vmtruncate(inode);
3784
3785 if (writeback)
3786 /*
3787 * queue inode for writeback: we can't actually call
3788 * filemap_write_and_wait, etc. from message handler
3789 * context.
3790 */
3791 ceph_queue_writeback(inode);
3792 if (queue_invalidate)
3793 ceph_queue_invalidate(inode);
3794 if (deleted_inode)
3795 invalidate_aliases(inode);
3796 if (wake)
3797 wake_up_all(&ci->i_cap_wq);
3798
3799 mutex_unlock(&session->s_mutex);
3800 if (check_caps == 1)
3801 ceph_check_caps(ci, flags | CHECK_CAPS_AUTHONLY | CHECK_CAPS_NOINVAL);
3802 else if (check_caps == 2)
3803 ceph_check_caps(ci, flags | CHECK_CAPS_NOINVAL);
3804}
3805
3806/*
3807 * Handle FLUSH_ACK from MDS, indicating that metadata we sent to the
3808 * MDS has been safely committed.
3809 */
3810static void handle_cap_flush_ack(struct inode *inode, u64 flush_tid,
3811 struct ceph_mds_caps *m,
3812 struct ceph_mds_session *session,
3813 struct ceph_cap *cap)
3814 __releases(ci->i_ceph_lock)
3815{
3816 struct ceph_inode_info *ci = ceph_inode(inode);
3817 struct ceph_mds_client *mdsc = ceph_sb_to_fs_client(inode->i_sb)->mdsc;
3818 struct ceph_client *cl = mdsc->fsc->client;
3819 struct ceph_cap_flush *cf, *tmp_cf;
3820 LIST_HEAD(to_remove);
3821 unsigned seq = le32_to_cpu(m->seq);
3822 int dirty = le32_to_cpu(m->dirty);
3823 int cleaned = 0;
3824 bool drop = false;
3825 bool wake_ci = false;
3826 bool wake_mdsc = false;
3827
3828 list_for_each_entry_safe(cf, tmp_cf, &ci->i_cap_flush_list, i_list) {
3829 /* Is this the one that was flushed? */
3830 if (cf->tid == flush_tid)
3831 cleaned = cf->caps;
3832
3833 /* Is this a capsnap? */
3834 if (cf->is_capsnap)
3835 continue;
3836
3837 if (cf->tid <= flush_tid) {
3838 /*
3839 * An earlier or current tid. The FLUSH_ACK should
3840 * represent a superset of this flush's caps.
3841 */
3842 wake_ci |= __detach_cap_flush_from_ci(ci, cf);
3843 list_add_tail(&cf->i_list, &to_remove);
3844 } else {
3845 /*
3846 * This is a later one. Any caps in it are still dirty
3847 * so don't count them as cleaned.
3848 */
3849 cleaned &= ~cf->caps;
3850 if (!cleaned)
3851 break;
3852 }
3853 }
3854
3855 doutc(cl, "%p %llx.%llx mds%d seq %d on %s cleaned %s, flushing %s -> %s\n",
3856 inode, ceph_vinop(inode), session->s_mds, seq,
3857 ceph_cap_string(dirty), ceph_cap_string(cleaned),
3858 ceph_cap_string(ci->i_flushing_caps),
3859 ceph_cap_string(ci->i_flushing_caps & ~cleaned));
3860
3861 if (list_empty(&to_remove) && !cleaned)
3862 goto out;
3863
3864 ci->i_flushing_caps &= ~cleaned;
3865
3866 spin_lock(&mdsc->cap_dirty_lock);
3867
3868 list_for_each_entry(cf, &to_remove, i_list)
3869 wake_mdsc |= __detach_cap_flush_from_mdsc(mdsc, cf);
3870
3871 if (ci->i_flushing_caps == 0) {
3872 if (list_empty(&ci->i_cap_flush_list)) {
3873 list_del_init(&ci->i_flushing_item);
3874 if (!list_empty(&session->s_cap_flushing)) {
3875 struct inode *inode =
3876 &list_first_entry(&session->s_cap_flushing,
3877 struct ceph_inode_info,
3878 i_flushing_item)->netfs.inode;
3879 doutc(cl, " mds%d still flushing cap on %p %llx.%llx\n",
3880 session->s_mds, inode, ceph_vinop(inode));
3881 }
3882 }
3883 mdsc->num_cap_flushing--;
3884 doutc(cl, " %p %llx.%llx now !flushing\n", inode,
3885 ceph_vinop(inode));
3886
3887 if (ci->i_dirty_caps == 0) {
3888 doutc(cl, " %p %llx.%llx now clean\n", inode,
3889 ceph_vinop(inode));
3890 BUG_ON(!list_empty(&ci->i_dirty_item));
3891 drop = true;
3892 if (ci->i_wr_ref == 0 &&
3893 ci->i_wrbuffer_ref_head == 0) {
3894 BUG_ON(!ci->i_head_snapc);
3895 ceph_put_snap_context(ci->i_head_snapc);
3896 ci->i_head_snapc = NULL;
3897 }
3898 } else {
3899 BUG_ON(list_empty(&ci->i_dirty_item));
3900 }
3901 }
3902 spin_unlock(&mdsc->cap_dirty_lock);
3903
3904out:
3905 spin_unlock(&ci->i_ceph_lock);
3906
3907 while (!list_empty(&to_remove)) {
3908 cf = list_first_entry(&to_remove,
3909 struct ceph_cap_flush, i_list);
3910 list_del_init(&cf->i_list);
3911 if (!cf->is_capsnap)
3912 ceph_free_cap_flush(cf);
3913 }
3914
3915 if (wake_ci)
3916 wake_up_all(&ci->i_cap_wq);
3917 if (wake_mdsc)
3918 wake_up_all(&mdsc->cap_flushing_wq);
3919 if (drop)
3920 iput(inode);
3921}
3922
3923void __ceph_remove_capsnap(struct inode *inode, struct ceph_cap_snap *capsnap,
3924 bool *wake_ci, bool *wake_mdsc)
3925{
3926 struct ceph_inode_info *ci = ceph_inode(inode);
3927 struct ceph_mds_client *mdsc = ceph_sb_to_fs_client(inode->i_sb)->mdsc;
3928 struct ceph_client *cl = mdsc->fsc->client;
3929 bool ret;
3930
3931 lockdep_assert_held(&ci->i_ceph_lock);
3932
3933 doutc(cl, "removing capsnap %p, %p %llx.%llx ci %p\n", capsnap,
3934 inode, ceph_vinop(inode), ci);
3935
3936 list_del_init(&capsnap->ci_item);
3937 ret = __detach_cap_flush_from_ci(ci, &capsnap->cap_flush);
3938 if (wake_ci)
3939 *wake_ci = ret;
3940
3941 spin_lock(&mdsc->cap_dirty_lock);
3942 if (list_empty(&ci->i_cap_flush_list))
3943 list_del_init(&ci->i_flushing_item);
3944
3945 ret = __detach_cap_flush_from_mdsc(mdsc, &capsnap->cap_flush);
3946 if (wake_mdsc)
3947 *wake_mdsc = ret;
3948 spin_unlock(&mdsc->cap_dirty_lock);
3949}
3950
3951void ceph_remove_capsnap(struct inode *inode, struct ceph_cap_snap *capsnap,
3952 bool *wake_ci, bool *wake_mdsc)
3953{
3954 struct ceph_inode_info *ci = ceph_inode(inode);
3955
3956 lockdep_assert_held(&ci->i_ceph_lock);
3957
3958 WARN_ON_ONCE(capsnap->dirty_pages || capsnap->writing);
3959 __ceph_remove_capsnap(inode, capsnap, wake_ci, wake_mdsc);
3960}
3961
3962/*
3963 * Handle FLUSHSNAP_ACK. MDS has flushed snap data to disk and we can
3964 * throw away our cap_snap.
3965 *
3966 * Caller hold s_mutex.
3967 */
3968static void handle_cap_flushsnap_ack(struct inode *inode, u64 flush_tid,
3969 struct ceph_mds_caps *m,
3970 struct ceph_mds_session *session)
3971{
3972 struct ceph_inode_info *ci = ceph_inode(inode);
3973 struct ceph_mds_client *mdsc = ceph_sb_to_fs_client(inode->i_sb)->mdsc;
3974 struct ceph_client *cl = mdsc->fsc->client;
3975 u64 follows = le64_to_cpu(m->snap_follows);
3976 struct ceph_cap_snap *capsnap = NULL, *iter;
3977 bool wake_ci = false;
3978 bool wake_mdsc = false;
3979
3980 doutc(cl, "%p %llx.%llx ci %p mds%d follows %lld\n", inode,
3981 ceph_vinop(inode), ci, session->s_mds, follows);
3982
3983 spin_lock(&ci->i_ceph_lock);
3984 list_for_each_entry(iter, &ci->i_cap_snaps, ci_item) {
3985 if (iter->follows == follows) {
3986 if (iter->cap_flush.tid != flush_tid) {
3987 doutc(cl, " cap_snap %p follows %lld "
3988 "tid %lld != %lld\n", iter,
3989 follows, flush_tid,
3990 iter->cap_flush.tid);
3991 break;
3992 }
3993 capsnap = iter;
3994 break;
3995 } else {
3996 doutc(cl, " skipping cap_snap %p follows %lld\n",
3997 iter, iter->follows);
3998 }
3999 }
4000 if (capsnap)
4001 ceph_remove_capsnap(inode, capsnap, &wake_ci, &wake_mdsc);
4002 spin_unlock(&ci->i_ceph_lock);
4003
4004 if (capsnap) {
4005 ceph_put_snap_context(capsnap->context);
4006 ceph_put_cap_snap(capsnap);
4007 if (wake_ci)
4008 wake_up_all(&ci->i_cap_wq);
4009 if (wake_mdsc)
4010 wake_up_all(&mdsc->cap_flushing_wq);
4011 iput(inode);
4012 }
4013}
4014
4015/*
4016 * Handle TRUNC from MDS, indicating file truncation.
4017 *
4018 * caller hold s_mutex.
4019 */
4020static bool handle_cap_trunc(struct inode *inode,
4021 struct ceph_mds_caps *trunc,
4022 struct ceph_mds_session *session,
4023 struct cap_extra_info *extra_info)
4024{
4025 struct ceph_inode_info *ci = ceph_inode(inode);
4026 struct ceph_client *cl = ceph_inode_to_client(inode);
4027 int mds = session->s_mds;
4028 int seq = le32_to_cpu(trunc->seq);
4029 u32 truncate_seq = le32_to_cpu(trunc->truncate_seq);
4030 u64 truncate_size = le64_to_cpu(trunc->truncate_size);
4031 u64 size = le64_to_cpu(trunc->size);
4032 int implemented = 0;
4033 int dirty = __ceph_caps_dirty(ci);
4034 int issued = __ceph_caps_issued(ceph_inode(inode), &implemented);
4035 bool queue_trunc = false;
4036
4037 lockdep_assert_held(&ci->i_ceph_lock);
4038
4039 issued |= implemented | dirty;
4040
4041 /*
4042 * If there is at least one crypto block then we'll trust
4043 * fscrypt_file_size. If the real length of the file is 0, then
4044 * ignore it (it has probably been truncated down to 0 by the MDS).
4045 */
4046 if (IS_ENCRYPTED(inode) && size)
4047 size = extra_info->fscrypt_file_size;
4048
4049 doutc(cl, "%p %llx.%llx mds%d seq %d to %lld truncate seq %d\n",
4050 inode, ceph_vinop(inode), mds, seq, truncate_size, truncate_seq);
4051 queue_trunc = ceph_fill_file_size(inode, issued,
4052 truncate_seq, truncate_size, size);
4053 return queue_trunc;
4054}
4055
4056/*
4057 * Handle EXPORT from MDS. Cap is being migrated _from_ this mds to a
4058 * different one. If we are the most recent migration we've seen (as
4059 * indicated by mseq), make note of the migrating cap bits for the
4060 * duration (until we see the corresponding IMPORT).
4061 *
4062 * caller holds s_mutex
4063 */
4064static void handle_cap_export(struct inode *inode, struct ceph_mds_caps *ex,
4065 struct ceph_mds_cap_peer *ph,
4066 struct ceph_mds_session *session)
4067{
4068 struct ceph_mds_client *mdsc = ceph_inode_to_fs_client(inode)->mdsc;
4069 struct ceph_client *cl = mdsc->fsc->client;
4070 struct ceph_mds_session *tsession = NULL;
4071 struct ceph_cap *cap, *tcap, *new_cap = NULL;
4072 struct ceph_inode_info *ci = ceph_inode(inode);
4073 u64 t_cap_id;
4074 u32 t_issue_seq, t_mseq;
4075 int target, issued;
4076 int mds = session->s_mds;
4077
4078 if (ph) {
4079 t_cap_id = le64_to_cpu(ph->cap_id);
4080 t_issue_seq = le32_to_cpu(ph->issue_seq);
4081 t_mseq = le32_to_cpu(ph->mseq);
4082 target = le32_to_cpu(ph->mds);
4083 } else {
4084 t_cap_id = t_issue_seq = t_mseq = 0;
4085 target = -1;
4086 }
4087
4088 doutc(cl, " cap %llx.%llx export to peer %d piseq %u pmseq %u\n",
4089 ceph_vinop(inode), target, t_issue_seq, t_mseq);
4090retry:
4091 down_read(&mdsc->snap_rwsem);
4092 spin_lock(&ci->i_ceph_lock);
4093 cap = __get_cap_for_mds(ci, mds);
4094 if (!cap || cap->cap_id != le64_to_cpu(ex->cap_id))
4095 goto out_unlock;
4096
4097 if (target < 0) {
4098 ceph_remove_cap(mdsc, cap, false);
4099 goto out_unlock;
4100 }
4101
4102 /*
4103 * now we know we haven't received the cap import message yet
4104 * because the exported cap still exist.
4105 */
4106
4107 issued = cap->issued;
4108 if (issued != cap->implemented)
4109 pr_err_ratelimited_client(cl, "issued != implemented: "
4110 "%p %llx.%llx mds%d seq %d mseq %d"
4111 " issued %s implemented %s\n",
4112 inode, ceph_vinop(inode), mds,
4113 cap->seq, cap->mseq,
4114 ceph_cap_string(issued),
4115 ceph_cap_string(cap->implemented));
4116
4117
4118 tcap = __get_cap_for_mds(ci, target);
4119 if (tcap) {
4120 /* already have caps from the target */
4121 if (tcap->cap_id == t_cap_id &&
4122 ceph_seq_cmp(tcap->seq, t_issue_seq) < 0) {
4123 doutc(cl, " updating import cap %p mds%d\n", tcap,
4124 target);
4125 tcap->cap_id = t_cap_id;
4126 tcap->seq = t_issue_seq - 1;
4127 tcap->issue_seq = t_issue_seq - 1;
4128 tcap->issued |= issued;
4129 tcap->implemented |= issued;
4130 if (cap == ci->i_auth_cap) {
4131 ci->i_auth_cap = tcap;
4132 change_auth_cap_ses(ci, tcap->session);
4133 }
4134 }
4135 ceph_remove_cap(mdsc, cap, false);
4136 goto out_unlock;
4137 } else if (tsession) {
4138 /* add placeholder for the export target */
4139 int flag = (cap == ci->i_auth_cap) ? CEPH_CAP_FLAG_AUTH : 0;
4140 tcap = new_cap;
4141 ceph_add_cap(inode, tsession, t_cap_id, issued, 0,
4142 t_issue_seq - 1, t_mseq, (u64)-1, flag, &new_cap);
4143
4144 if (!list_empty(&ci->i_cap_flush_list) &&
4145 ci->i_auth_cap == tcap) {
4146 spin_lock(&mdsc->cap_dirty_lock);
4147 list_move_tail(&ci->i_flushing_item,
4148 &tcap->session->s_cap_flushing);
4149 spin_unlock(&mdsc->cap_dirty_lock);
4150 }
4151
4152 ceph_remove_cap(mdsc, cap, false);
4153 goto out_unlock;
4154 }
4155
4156 spin_unlock(&ci->i_ceph_lock);
4157 up_read(&mdsc->snap_rwsem);
4158 mutex_unlock(&session->s_mutex);
4159
4160 /* open target session */
4161 tsession = ceph_mdsc_open_export_target_session(mdsc, target);
4162 if (!IS_ERR(tsession)) {
4163 if (mds > target) {
4164 mutex_lock(&session->s_mutex);
4165 mutex_lock_nested(&tsession->s_mutex,
4166 SINGLE_DEPTH_NESTING);
4167 } else {
4168 mutex_lock(&tsession->s_mutex);
4169 mutex_lock_nested(&session->s_mutex,
4170 SINGLE_DEPTH_NESTING);
4171 }
4172 new_cap = ceph_get_cap(mdsc, NULL);
4173 } else {
4174 WARN_ON(1);
4175 tsession = NULL;
4176 target = -1;
4177 mutex_lock(&session->s_mutex);
4178 }
4179 goto retry;
4180
4181out_unlock:
4182 spin_unlock(&ci->i_ceph_lock);
4183 up_read(&mdsc->snap_rwsem);
4184 mutex_unlock(&session->s_mutex);
4185 if (tsession) {
4186 mutex_unlock(&tsession->s_mutex);
4187 ceph_put_mds_session(tsession);
4188 }
4189 if (new_cap)
4190 ceph_put_cap(mdsc, new_cap);
4191}
4192
4193/*
4194 * Handle cap IMPORT.
4195 *
4196 * caller holds s_mutex. acquires i_ceph_lock
4197 */
4198static void handle_cap_import(struct ceph_mds_client *mdsc,
4199 struct inode *inode, struct ceph_mds_caps *im,
4200 struct ceph_mds_cap_peer *ph,
4201 struct ceph_mds_session *session,
4202 struct ceph_cap **target_cap, int *old_issued)
4203{
4204 struct ceph_inode_info *ci = ceph_inode(inode);
4205 struct ceph_client *cl = mdsc->fsc->client;
4206 struct ceph_cap *cap, *ocap, *new_cap = NULL;
4207 int mds = session->s_mds;
4208 int issued;
4209 unsigned caps = le32_to_cpu(im->caps);
4210 unsigned wanted = le32_to_cpu(im->wanted);
4211 unsigned seq = le32_to_cpu(im->seq);
4212 unsigned mseq = le32_to_cpu(im->migrate_seq);
4213 u64 realmino = le64_to_cpu(im->realm);
4214 u64 cap_id = le64_to_cpu(im->cap_id);
4215 u64 p_cap_id;
4216 u32 piseq = 0;
4217 u32 pmseq = 0;
4218 int peer;
4219
4220 if (ph) {
4221 p_cap_id = le64_to_cpu(ph->cap_id);
4222 peer = le32_to_cpu(ph->mds);
4223 piseq = le32_to_cpu(ph->issue_seq);
4224 pmseq = le32_to_cpu(ph->mseq);
4225 } else {
4226 p_cap_id = 0;
4227 peer = -1;
4228 }
4229
4230 doutc(cl, " cap %llx.%llx import from peer %d piseq %u pmseq %u\n",
4231 ceph_vinop(inode), peer, piseq, pmseq);
4232retry:
4233 cap = __get_cap_for_mds(ci, mds);
4234 if (!cap) {
4235 if (!new_cap) {
4236 spin_unlock(&ci->i_ceph_lock);
4237 new_cap = ceph_get_cap(mdsc, NULL);
4238 spin_lock(&ci->i_ceph_lock);
4239 goto retry;
4240 }
4241 cap = new_cap;
4242 } else {
4243 if (new_cap) {
4244 ceph_put_cap(mdsc, new_cap);
4245 new_cap = NULL;
4246 }
4247 }
4248
4249 __ceph_caps_issued(ci, &issued);
4250 issued |= __ceph_caps_dirty(ci);
4251
4252 ceph_add_cap(inode, session, cap_id, caps, wanted, seq, mseq,
4253 realmino, CEPH_CAP_FLAG_AUTH, &new_cap);
4254
4255 ocap = peer >= 0 ? __get_cap_for_mds(ci, peer) : NULL;
4256 if (ocap && ocap->cap_id == p_cap_id) {
4257 doutc(cl, " remove export cap %p mds%d flags %d\n",
4258 ocap, peer, ph->flags);
4259 if ((ph->flags & CEPH_CAP_FLAG_AUTH) &&
4260 (ocap->seq != piseq ||
4261 ocap->mseq != pmseq)) {
4262 pr_err_ratelimited_client(cl, "mismatched seq/mseq: "
4263 "%p %llx.%llx mds%d seq %d mseq %d"
4264 " importer mds%d has peer seq %d mseq %d\n",
4265 inode, ceph_vinop(inode), peer,
4266 ocap->seq, ocap->mseq, mds, piseq, pmseq);
4267 }
4268 ceph_remove_cap(mdsc, ocap, (ph->flags & CEPH_CAP_FLAG_RELEASE));
4269 }
4270
4271 *old_issued = issued;
4272 *target_cap = cap;
4273}
4274
4275#ifdef CONFIG_FS_ENCRYPTION
4276static int parse_fscrypt_fields(void **p, void *end,
4277 struct cap_extra_info *extra)
4278{
4279 u32 len;
4280
4281 ceph_decode_32_safe(p, end, extra->fscrypt_auth_len, bad);
4282 if (extra->fscrypt_auth_len) {
4283 ceph_decode_need(p, end, extra->fscrypt_auth_len, bad);
4284 extra->fscrypt_auth = kmalloc(extra->fscrypt_auth_len,
4285 GFP_KERNEL);
4286 if (!extra->fscrypt_auth)
4287 return -ENOMEM;
4288 ceph_decode_copy_safe(p, end, extra->fscrypt_auth,
4289 extra->fscrypt_auth_len, bad);
4290 }
4291
4292 ceph_decode_32_safe(p, end, len, bad);
4293 if (len >= sizeof(u64)) {
4294 ceph_decode_64_safe(p, end, extra->fscrypt_file_size, bad);
4295 len -= sizeof(u64);
4296 }
4297 ceph_decode_skip_n(p, end, len, bad);
4298 return 0;
4299bad:
4300 return -EIO;
4301}
4302#else
4303static int parse_fscrypt_fields(void **p, void *end,
4304 struct cap_extra_info *extra)
4305{
4306 u32 len;
4307
4308 /* Don't care about these fields unless we're encryption-capable */
4309 ceph_decode_32_safe(p, end, len, bad);
4310 if (len)
4311 ceph_decode_skip_n(p, end, len, bad);
4312 ceph_decode_32_safe(p, end, len, bad);
4313 if (len)
4314 ceph_decode_skip_n(p, end, len, bad);
4315 return 0;
4316bad:
4317 return -EIO;
4318}
4319#endif
4320
4321/*
4322 * Handle a caps message from the MDS.
4323 *
4324 * Identify the appropriate session, inode, and call the right handler
4325 * based on the cap op.
4326 */
4327void ceph_handle_caps(struct ceph_mds_session *session,
4328 struct ceph_msg *msg)
4329{
4330 struct ceph_mds_client *mdsc = session->s_mdsc;
4331 struct ceph_client *cl = mdsc->fsc->client;
4332 struct inode *inode;
4333 struct ceph_inode_info *ci;
4334 struct ceph_cap *cap;
4335 struct ceph_mds_caps *h;
4336 struct ceph_mds_cap_peer *peer = NULL;
4337 struct ceph_snap_realm *realm = NULL;
4338 int op;
4339 int msg_version = le16_to_cpu(msg->hdr.version);
4340 u32 seq, mseq, issue_seq;
4341 struct ceph_vino vino;
4342 void *snaptrace;
4343 size_t snaptrace_len;
4344 void *p, *end;
4345 struct cap_extra_info extra_info = {};
4346 bool queue_trunc;
4347 bool close_sessions = false;
4348 bool do_cap_release = false;
4349
4350 if (!ceph_inc_mds_stopping_blocker(mdsc, session))
4351 return;
4352
4353 /* decode */
4354 end = msg->front.iov_base + msg->front.iov_len;
4355 if (msg->front.iov_len < sizeof(*h))
4356 goto bad;
4357 h = msg->front.iov_base;
4358 op = le32_to_cpu(h->op);
4359 vino.ino = le64_to_cpu(h->ino);
4360 vino.snap = CEPH_NOSNAP;
4361 seq = le32_to_cpu(h->seq);
4362 mseq = le32_to_cpu(h->migrate_seq);
4363 issue_seq = le32_to_cpu(h->issue_seq);
4364
4365 snaptrace = h + 1;
4366 snaptrace_len = le32_to_cpu(h->snap_trace_len);
4367 p = snaptrace + snaptrace_len;
4368
4369 if (msg_version >= 2) {
4370 u32 flock_len;
4371 ceph_decode_32_safe(&p, end, flock_len, bad);
4372 if (p + flock_len > end)
4373 goto bad;
4374 p += flock_len;
4375 }
4376
4377 if (msg_version >= 3) {
4378 if (op == CEPH_CAP_OP_IMPORT) {
4379 if (p + sizeof(*peer) > end)
4380 goto bad;
4381 peer = p;
4382 p += sizeof(*peer);
4383 } else if (op == CEPH_CAP_OP_EXPORT) {
4384 /* recorded in unused fields */
4385 peer = (void *)&h->size;
4386 }
4387 }
4388
4389 if (msg_version >= 4) {
4390 ceph_decode_64_safe(&p, end, extra_info.inline_version, bad);
4391 ceph_decode_32_safe(&p, end, extra_info.inline_len, bad);
4392 if (p + extra_info.inline_len > end)
4393 goto bad;
4394 extra_info.inline_data = p;
4395 p += extra_info.inline_len;
4396 }
4397
4398 if (msg_version >= 5) {
4399 struct ceph_osd_client *osdc = &mdsc->fsc->client->osdc;
4400 u32 epoch_barrier;
4401
4402 ceph_decode_32_safe(&p, end, epoch_barrier, bad);
4403 ceph_osdc_update_epoch_barrier(osdc, epoch_barrier);
4404 }
4405
4406 if (msg_version >= 8) {
4407 u32 pool_ns_len;
4408
4409 /* version >= 6 */
4410 ceph_decode_skip_64(&p, end, bad); // flush_tid
4411 /* version >= 7 */
4412 ceph_decode_skip_32(&p, end, bad); // caller_uid
4413 ceph_decode_skip_32(&p, end, bad); // caller_gid
4414 /* version >= 8 */
4415 ceph_decode_32_safe(&p, end, pool_ns_len, bad);
4416 if (pool_ns_len > 0) {
4417 ceph_decode_need(&p, end, pool_ns_len, bad);
4418 extra_info.pool_ns =
4419 ceph_find_or_create_string(p, pool_ns_len);
4420 p += pool_ns_len;
4421 }
4422 }
4423
4424 if (msg_version >= 9) {
4425 struct ceph_timespec *btime;
4426
4427 if (p + sizeof(*btime) > end)
4428 goto bad;
4429 btime = p;
4430 ceph_decode_timespec64(&extra_info.btime, btime);
4431 p += sizeof(*btime);
4432 ceph_decode_64_safe(&p, end, extra_info.change_attr, bad);
4433 }
4434
4435 if (msg_version >= 11) {
4436 /* version >= 10 */
4437 ceph_decode_skip_32(&p, end, bad); // flags
4438 /* version >= 11 */
4439 extra_info.dirstat_valid = true;
4440 ceph_decode_64_safe(&p, end, extra_info.nfiles, bad);
4441 ceph_decode_64_safe(&p, end, extra_info.nsubdirs, bad);
4442 }
4443
4444 if (msg_version >= 12) {
4445 if (parse_fscrypt_fields(&p, end, &extra_info))
4446 goto bad;
4447 }
4448
4449 /* lookup ino */
4450 inode = ceph_find_inode(mdsc->fsc->sb, vino);
4451 doutc(cl, " caps mds%d op %s ino %llx.%llx inode %p seq %u iseq %u mseq %u\n",
4452 session->s_mds, ceph_cap_op_name(op), vino.ino, vino.snap, inode,
4453 seq, issue_seq, mseq);
4454
4455 mutex_lock(&session->s_mutex);
4456
4457 if (!inode) {
4458 doutc(cl, " i don't have ino %llx\n", vino.ino);
4459
4460 switch (op) {
4461 case CEPH_CAP_OP_IMPORT:
4462 case CEPH_CAP_OP_REVOKE:
4463 case CEPH_CAP_OP_GRANT:
4464 do_cap_release = true;
4465 break;
4466 default:
4467 break;
4468 }
4469 goto flush_cap_releases;
4470 }
4471 ci = ceph_inode(inode);
4472
4473 /* these will work even if we don't have a cap yet */
4474 switch (op) {
4475 case CEPH_CAP_OP_FLUSHSNAP_ACK:
4476 handle_cap_flushsnap_ack(inode, le64_to_cpu(msg->hdr.tid),
4477 h, session);
4478 goto done;
4479
4480 case CEPH_CAP_OP_EXPORT:
4481 handle_cap_export(inode, h, peer, session);
4482 goto done_unlocked;
4483
4484 case CEPH_CAP_OP_IMPORT:
4485 realm = NULL;
4486 if (snaptrace_len) {
4487 down_write(&mdsc->snap_rwsem);
4488 if (ceph_update_snap_trace(mdsc, snaptrace,
4489 snaptrace + snaptrace_len,
4490 false, &realm)) {
4491 up_write(&mdsc->snap_rwsem);
4492 close_sessions = true;
4493 goto done;
4494 }
4495 downgrade_write(&mdsc->snap_rwsem);
4496 } else {
4497 down_read(&mdsc->snap_rwsem);
4498 }
4499 spin_lock(&ci->i_ceph_lock);
4500 handle_cap_import(mdsc, inode, h, peer, session,
4501 &cap, &extra_info.issued);
4502 handle_cap_grant(inode, session, cap,
4503 h, msg->middle, &extra_info);
4504 if (realm)
4505 ceph_put_snap_realm(mdsc, realm);
4506 goto done_unlocked;
4507 }
4508
4509 /* the rest require a cap */
4510 spin_lock(&ci->i_ceph_lock);
4511 cap = __get_cap_for_mds(ceph_inode(inode), session->s_mds);
4512 if (!cap) {
4513 doutc(cl, " no cap on %p ino %llx.%llx from mds%d\n",
4514 inode, ceph_ino(inode), ceph_snap(inode),
4515 session->s_mds);
4516 spin_unlock(&ci->i_ceph_lock);
4517 switch (op) {
4518 case CEPH_CAP_OP_REVOKE:
4519 case CEPH_CAP_OP_GRANT:
4520 do_cap_release = true;
4521 break;
4522 default:
4523 break;
4524 }
4525 goto flush_cap_releases;
4526 }
4527
4528 /* note that each of these drops i_ceph_lock for us */
4529 switch (op) {
4530 case CEPH_CAP_OP_REVOKE:
4531 case CEPH_CAP_OP_GRANT:
4532 __ceph_caps_issued(ci, &extra_info.issued);
4533 extra_info.issued |= __ceph_caps_dirty(ci);
4534 handle_cap_grant(inode, session, cap,
4535 h, msg->middle, &extra_info);
4536 goto done_unlocked;
4537
4538 case CEPH_CAP_OP_FLUSH_ACK:
4539 handle_cap_flush_ack(inode, le64_to_cpu(msg->hdr.tid),
4540 h, session, cap);
4541 break;
4542
4543 case CEPH_CAP_OP_TRUNC:
4544 queue_trunc = handle_cap_trunc(inode, h, session,
4545 &extra_info);
4546 spin_unlock(&ci->i_ceph_lock);
4547 if (queue_trunc)
4548 ceph_queue_vmtruncate(inode);
4549 break;
4550
4551 default:
4552 spin_unlock(&ci->i_ceph_lock);
4553 pr_err_client(cl, "unknown cap op %d %s\n", op,
4554 ceph_cap_op_name(op));
4555 }
4556
4557done:
4558 mutex_unlock(&session->s_mutex);
4559done_unlocked:
4560 iput(inode);
4561out:
4562 ceph_dec_mds_stopping_blocker(mdsc);
4563
4564 ceph_put_string(extra_info.pool_ns);
4565
4566 /* Defer closing the sessions after s_mutex lock being released */
4567 if (close_sessions)
4568 ceph_mdsc_close_sessions(mdsc);
4569
4570 kfree(extra_info.fscrypt_auth);
4571 return;
4572
4573flush_cap_releases:
4574 /*
4575 * send any cap release message to try to move things
4576 * along for the mds (who clearly thinks we still have this
4577 * cap).
4578 */
4579 if (do_cap_release) {
4580 cap = ceph_get_cap(mdsc, NULL);
4581 cap->cap_ino = vino.ino;
4582 cap->queue_release = 1;
4583 cap->cap_id = le64_to_cpu(h->cap_id);
4584 cap->mseq = mseq;
4585 cap->seq = seq;
4586 cap->issue_seq = seq;
4587 spin_lock(&session->s_cap_lock);
4588 __ceph_queue_cap_release(session, cap);
4589 spin_unlock(&session->s_cap_lock);
4590 }
4591 ceph_flush_session_cap_releases(mdsc, session);
4592 goto done;
4593
4594bad:
4595 pr_err_client(cl, "corrupt message\n");
4596 ceph_msg_dump(msg);
4597 goto out;
4598}
4599
4600/*
4601 * Delayed work handler to process end of delayed cap release LRU list.
4602 *
4603 * If new caps are added to the list while processing it, these won't get
4604 * processed in this run. In this case, the ci->i_hold_caps_max will be
4605 * returned so that the work can be scheduled accordingly.
4606 */
4607unsigned long ceph_check_delayed_caps(struct ceph_mds_client *mdsc)
4608{
4609 struct ceph_client *cl = mdsc->fsc->client;
4610 struct inode *inode;
4611 struct ceph_inode_info *ci;
4612 struct ceph_mount_options *opt = mdsc->fsc->mount_options;
4613 unsigned long delay_max = opt->caps_wanted_delay_max * HZ;
4614 unsigned long loop_start = jiffies;
4615 unsigned long delay = 0;
4616
4617 doutc(cl, "begin\n");
4618 spin_lock(&mdsc->cap_delay_lock);
4619 while (!list_empty(&mdsc->cap_delay_list)) {
4620 ci = list_first_entry(&mdsc->cap_delay_list,
4621 struct ceph_inode_info,
4622 i_cap_delay_list);
4623 if (time_before(loop_start, ci->i_hold_caps_max - delay_max)) {
4624 doutc(cl, "caps added recently. Exiting loop");
4625 delay = ci->i_hold_caps_max;
4626 break;
4627 }
4628 if ((ci->i_ceph_flags & CEPH_I_FLUSH) == 0 &&
4629 time_before(jiffies, ci->i_hold_caps_max))
4630 break;
4631 list_del_init(&ci->i_cap_delay_list);
4632
4633 inode = igrab(&ci->netfs.inode);
4634 if (inode) {
4635 spin_unlock(&mdsc->cap_delay_lock);
4636 doutc(cl, "on %p %llx.%llx\n", inode,
4637 ceph_vinop(inode));
4638 ceph_check_caps(ci, 0);
4639 iput(inode);
4640 spin_lock(&mdsc->cap_delay_lock);
4641 }
4642
4643 /*
4644 * Make sure too many dirty caps or general
4645 * slowness doesn't block mdsc delayed work,
4646 * preventing send_renew_caps() from running.
4647 */
4648 if (time_after_eq(jiffies, loop_start + 5 * HZ))
4649 break;
4650 }
4651 spin_unlock(&mdsc->cap_delay_lock);
4652 doutc(cl, "done\n");
4653
4654 return delay;
4655}
4656
4657/*
4658 * Flush all dirty caps to the mds
4659 */
4660static void flush_dirty_session_caps(struct ceph_mds_session *s)
4661{
4662 struct ceph_mds_client *mdsc = s->s_mdsc;
4663 struct ceph_client *cl = mdsc->fsc->client;
4664 struct ceph_inode_info *ci;
4665 struct inode *inode;
4666
4667 doutc(cl, "begin\n");
4668 spin_lock(&mdsc->cap_dirty_lock);
4669 while (!list_empty(&s->s_cap_dirty)) {
4670 ci = list_first_entry(&s->s_cap_dirty, struct ceph_inode_info,
4671 i_dirty_item);
4672 inode = &ci->netfs.inode;
4673 ihold(inode);
4674 doutc(cl, "%p %llx.%llx\n", inode, ceph_vinop(inode));
4675 spin_unlock(&mdsc->cap_dirty_lock);
4676 ceph_wait_on_async_create(inode);
4677 ceph_check_caps(ci, CHECK_CAPS_FLUSH);
4678 iput(inode);
4679 spin_lock(&mdsc->cap_dirty_lock);
4680 }
4681 spin_unlock(&mdsc->cap_dirty_lock);
4682 doutc(cl, "done\n");
4683}
4684
4685void ceph_flush_dirty_caps(struct ceph_mds_client *mdsc)
4686{
4687 ceph_mdsc_iterate_sessions(mdsc, flush_dirty_session_caps, true);
4688}
4689
4690/*
4691 * Flush all cap releases to the mds
4692 */
4693static void flush_cap_releases(struct ceph_mds_session *s)
4694{
4695 struct ceph_mds_client *mdsc = s->s_mdsc;
4696 struct ceph_client *cl = mdsc->fsc->client;
4697
4698 doutc(cl, "begin\n");
4699 spin_lock(&s->s_cap_lock);
4700 if (s->s_num_cap_releases)
4701 ceph_flush_session_cap_releases(mdsc, s);
4702 spin_unlock(&s->s_cap_lock);
4703 doutc(cl, "done\n");
4704
4705}
4706
4707void ceph_flush_cap_releases(struct ceph_mds_client *mdsc)
4708{
4709 ceph_mdsc_iterate_sessions(mdsc, flush_cap_releases, true);
4710}
4711
4712void __ceph_touch_fmode(struct ceph_inode_info *ci,
4713 struct ceph_mds_client *mdsc, int fmode)
4714{
4715 unsigned long now = jiffies;
4716 if (fmode & CEPH_FILE_MODE_RD)
4717 ci->i_last_rd = now;
4718 if (fmode & CEPH_FILE_MODE_WR)
4719 ci->i_last_wr = now;
4720 /* queue periodic check */
4721 if (fmode &&
4722 __ceph_is_any_real_caps(ci) &&
4723 list_empty(&ci->i_cap_delay_list))
4724 __cap_delay_requeue(mdsc, ci);
4725}
4726
4727void ceph_get_fmode(struct ceph_inode_info *ci, int fmode, int count)
4728{
4729 struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(ci->netfs.inode.i_sb);
4730 int bits = (fmode << 1) | 1;
4731 bool already_opened = false;
4732 int i;
4733
4734 if (count == 1)
4735 atomic64_inc(&mdsc->metric.opened_files);
4736
4737 spin_lock(&ci->i_ceph_lock);
4738 for (i = 0; i < CEPH_FILE_MODE_BITS; i++) {
4739 /*
4740 * If any of the mode ref is larger than 0,
4741 * that means it has been already opened by
4742 * others. Just skip checking the PIN ref.
4743 */
4744 if (i && ci->i_nr_by_mode[i])
4745 already_opened = true;
4746
4747 if (bits & (1 << i))
4748 ci->i_nr_by_mode[i] += count;
4749 }
4750
4751 if (!already_opened)
4752 percpu_counter_inc(&mdsc->metric.opened_inodes);
4753 spin_unlock(&ci->i_ceph_lock);
4754}
4755
4756/*
4757 * Drop open file reference. If we were the last open file,
4758 * we may need to release capabilities to the MDS (or schedule
4759 * their delayed release).
4760 */
4761void ceph_put_fmode(struct ceph_inode_info *ci, int fmode, int count)
4762{
4763 struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(ci->netfs.inode.i_sb);
4764 int bits = (fmode << 1) | 1;
4765 bool is_closed = true;
4766 int i;
4767
4768 if (count == 1)
4769 atomic64_dec(&mdsc->metric.opened_files);
4770
4771 spin_lock(&ci->i_ceph_lock);
4772 for (i = 0; i < CEPH_FILE_MODE_BITS; i++) {
4773 if (bits & (1 << i)) {
4774 BUG_ON(ci->i_nr_by_mode[i] < count);
4775 ci->i_nr_by_mode[i] -= count;
4776 }
4777
4778 /*
4779 * If any of the mode ref is not 0 after
4780 * decreased, that means it is still opened
4781 * by others. Just skip checking the PIN ref.
4782 */
4783 if (i && ci->i_nr_by_mode[i])
4784 is_closed = false;
4785 }
4786
4787 if (is_closed)
4788 percpu_counter_dec(&mdsc->metric.opened_inodes);
4789 spin_unlock(&ci->i_ceph_lock);
4790}
4791
4792/*
4793 * For a soon-to-be unlinked file, drop the LINK caps. If it
4794 * looks like the link count will hit 0, drop any other caps (other
4795 * than PIN) we don't specifically want (due to the file still being
4796 * open).
4797 */
4798int ceph_drop_caps_for_unlink(struct inode *inode)
4799{
4800 struct ceph_inode_info *ci = ceph_inode(inode);
4801 int drop = CEPH_CAP_LINK_SHARED | CEPH_CAP_LINK_EXCL;
4802
4803 spin_lock(&ci->i_ceph_lock);
4804 if (inode->i_nlink == 1) {
4805 drop |= ~(__ceph_caps_wanted(ci) | CEPH_CAP_PIN);
4806
4807 if (__ceph_caps_dirty(ci)) {
4808 struct ceph_mds_client *mdsc =
4809 ceph_inode_to_fs_client(inode)->mdsc;
4810
4811 doutc(mdsc->fsc->client, "%p %llx.%llx\n", inode,
4812 ceph_vinop(inode));
4813 spin_lock(&mdsc->cap_delay_lock);
4814 ci->i_ceph_flags |= CEPH_I_FLUSH;
4815 if (!list_empty(&ci->i_cap_delay_list))
4816 list_del_init(&ci->i_cap_delay_list);
4817 list_add_tail(&ci->i_cap_delay_list,
4818 &mdsc->cap_unlink_delay_list);
4819 spin_unlock(&mdsc->cap_delay_lock);
4820
4821 /*
4822 * Fire the work immediately, because the MDS maybe
4823 * waiting for caps release.
4824 */
4825 ceph_queue_cap_unlink_work(mdsc);
4826 }
4827 }
4828 spin_unlock(&ci->i_ceph_lock);
4829 return drop;
4830}
4831
4832/*
4833 * Helpers for embedding cap and dentry lease releases into mds
4834 * requests.
4835 *
4836 * @force is used by dentry_release (below) to force inclusion of a
4837 * record for the directory inode, even when there aren't any caps to
4838 * drop.
4839 */
4840int ceph_encode_inode_release(void **p, struct inode *inode,
4841 int mds, int drop, int unless, int force)
4842{
4843 struct ceph_inode_info *ci = ceph_inode(inode);
4844 struct ceph_client *cl = ceph_inode_to_client(inode);
4845 struct ceph_cap *cap;
4846 struct ceph_mds_request_release *rel = *p;
4847 int used, dirty;
4848 int ret = 0;
4849
4850 spin_lock(&ci->i_ceph_lock);
4851 used = __ceph_caps_used(ci);
4852 dirty = __ceph_caps_dirty(ci);
4853
4854 doutc(cl, "%p %llx.%llx mds%d used|dirty %s drop %s unless %s\n",
4855 inode, ceph_vinop(inode), mds, ceph_cap_string(used|dirty),
4856 ceph_cap_string(drop), ceph_cap_string(unless));
4857
4858 /* only drop unused, clean caps */
4859 drop &= ~(used | dirty);
4860
4861 cap = __get_cap_for_mds(ci, mds);
4862 if (cap && __cap_is_valid(cap)) {
4863 unless &= cap->issued;
4864 if (unless) {
4865 if (unless & CEPH_CAP_AUTH_EXCL)
4866 drop &= ~CEPH_CAP_AUTH_SHARED;
4867 if (unless & CEPH_CAP_LINK_EXCL)
4868 drop &= ~CEPH_CAP_LINK_SHARED;
4869 if (unless & CEPH_CAP_XATTR_EXCL)
4870 drop &= ~CEPH_CAP_XATTR_SHARED;
4871 if (unless & CEPH_CAP_FILE_EXCL)
4872 drop &= ~CEPH_CAP_FILE_SHARED;
4873 }
4874
4875 if (force || (cap->issued & drop)) {
4876 if (cap->issued & drop) {
4877 int wanted = __ceph_caps_wanted(ci);
4878 doutc(cl, "%p %llx.%llx cap %p %s -> %s, "
4879 "wanted %s -> %s\n", inode,
4880 ceph_vinop(inode), cap,
4881 ceph_cap_string(cap->issued),
4882 ceph_cap_string(cap->issued & ~drop),
4883 ceph_cap_string(cap->mds_wanted),
4884 ceph_cap_string(wanted));
4885
4886 cap->issued &= ~drop;
4887 cap->implemented &= ~drop;
4888 cap->mds_wanted = wanted;
4889 if (cap == ci->i_auth_cap &&
4890 !(wanted & CEPH_CAP_ANY_FILE_WR))
4891 ci->i_requested_max_size = 0;
4892 } else {
4893 doutc(cl, "%p %llx.%llx cap %p %s (force)\n",
4894 inode, ceph_vinop(inode), cap,
4895 ceph_cap_string(cap->issued));
4896 }
4897
4898 rel->ino = cpu_to_le64(ceph_ino(inode));
4899 rel->cap_id = cpu_to_le64(cap->cap_id);
4900 rel->seq = cpu_to_le32(cap->seq);
4901 rel->issue_seq = cpu_to_le32(cap->issue_seq);
4902 rel->mseq = cpu_to_le32(cap->mseq);
4903 rel->caps = cpu_to_le32(cap->implemented);
4904 rel->wanted = cpu_to_le32(cap->mds_wanted);
4905 rel->dname_len = 0;
4906 rel->dname_seq = 0;
4907 *p += sizeof(*rel);
4908 ret = 1;
4909 } else {
4910 doutc(cl, "%p %llx.%llx cap %p %s (noop)\n",
4911 inode, ceph_vinop(inode), cap,
4912 ceph_cap_string(cap->issued));
4913 }
4914 }
4915 spin_unlock(&ci->i_ceph_lock);
4916 return ret;
4917}
4918
4919/**
4920 * ceph_encode_dentry_release - encode a dentry release into an outgoing request
4921 * @p: outgoing request buffer
4922 * @dentry: dentry to release
4923 * @dir: dir to release it from
4924 * @mds: mds that we're speaking to
4925 * @drop: caps being dropped
4926 * @unless: unless we have these caps
4927 *
4928 * Encode a dentry release into an outgoing request buffer. Returns 1 if the
4929 * thing was released, or a negative error code otherwise.
4930 */
4931int ceph_encode_dentry_release(void **p, struct dentry *dentry,
4932 struct inode *dir,
4933 int mds, int drop, int unless)
4934{
4935 struct ceph_mds_request_release *rel = *p;
4936 struct ceph_dentry_info *di = ceph_dentry(dentry);
4937 struct ceph_client *cl;
4938 int force = 0;
4939 int ret;
4940
4941 /* This shouldn't happen */
4942 BUG_ON(!dir);
4943
4944 /*
4945 * force an record for the directory caps if we have a dentry lease.
4946 * this is racy (can't take i_ceph_lock and d_lock together), but it
4947 * doesn't have to be perfect; the mds will revoke anything we don't
4948 * release.
4949 */
4950 spin_lock(&dentry->d_lock);
4951 if (di->lease_session && di->lease_session->s_mds == mds)
4952 force = 1;
4953 spin_unlock(&dentry->d_lock);
4954
4955 ret = ceph_encode_inode_release(p, dir, mds, drop, unless, force);
4956
4957 cl = ceph_inode_to_client(dir);
4958 spin_lock(&dentry->d_lock);
4959 if (ret && di->lease_session && di->lease_session->s_mds == mds) {
4960 doutc(cl, "%p mds%d seq %d\n", dentry, mds,
4961 (int)di->lease_seq);
4962 rel->dname_seq = cpu_to_le32(di->lease_seq);
4963 __ceph_mdsc_drop_dentry_lease(dentry);
4964 spin_unlock(&dentry->d_lock);
4965 if (IS_ENCRYPTED(dir) && fscrypt_has_encryption_key(dir)) {
4966 int ret2 = ceph_encode_encrypted_fname(dir, dentry, *p);
4967
4968 if (ret2 < 0)
4969 return ret2;
4970
4971 rel->dname_len = cpu_to_le32(ret2);
4972 *p += ret2;
4973 } else {
4974 rel->dname_len = cpu_to_le32(dentry->d_name.len);
4975 memcpy(*p, dentry->d_name.name, dentry->d_name.len);
4976 *p += dentry->d_name.len;
4977 }
4978 } else {
4979 spin_unlock(&dentry->d_lock);
4980 }
4981 return ret;
4982}
4983
4984static int remove_capsnaps(struct ceph_mds_client *mdsc, struct inode *inode)
4985{
4986 struct ceph_inode_info *ci = ceph_inode(inode);
4987 struct ceph_client *cl = mdsc->fsc->client;
4988 struct ceph_cap_snap *capsnap;
4989 int capsnap_release = 0;
4990
4991 lockdep_assert_held(&ci->i_ceph_lock);
4992
4993 doutc(cl, "removing capsnaps, ci is %p, %p %llx.%llx\n",
4994 ci, inode, ceph_vinop(inode));
4995
4996 while (!list_empty(&ci->i_cap_snaps)) {
4997 capsnap = list_first_entry(&ci->i_cap_snaps,
4998 struct ceph_cap_snap, ci_item);
4999 __ceph_remove_capsnap(inode, capsnap, NULL, NULL);
5000 ceph_put_snap_context(capsnap->context);
5001 ceph_put_cap_snap(capsnap);
5002 capsnap_release++;
5003 }
5004 wake_up_all(&ci->i_cap_wq);
5005 wake_up_all(&mdsc->cap_flushing_wq);
5006 return capsnap_release;
5007}
5008
5009int ceph_purge_inode_cap(struct inode *inode, struct ceph_cap *cap, bool *invalidate)
5010{
5011 struct ceph_fs_client *fsc = ceph_inode_to_fs_client(inode);
5012 struct ceph_mds_client *mdsc = fsc->mdsc;
5013 struct ceph_client *cl = fsc->client;
5014 struct ceph_inode_info *ci = ceph_inode(inode);
5015 bool is_auth;
5016 bool dirty_dropped = false;
5017 int iputs = 0;
5018
5019 lockdep_assert_held(&ci->i_ceph_lock);
5020
5021 doutc(cl, "removing cap %p, ci is %p, %p %llx.%llx\n",
5022 cap, ci, inode, ceph_vinop(inode));
5023
5024 is_auth = (cap == ci->i_auth_cap);
5025 __ceph_remove_cap(cap, false);
5026 if (is_auth) {
5027 struct ceph_cap_flush *cf;
5028
5029 if (ceph_inode_is_shutdown(inode)) {
5030 if (inode->i_data.nrpages > 0)
5031 *invalidate = true;
5032 if (ci->i_wrbuffer_ref > 0)
5033 mapping_set_error(&inode->i_data, -EIO);
5034 }
5035
5036 spin_lock(&mdsc->cap_dirty_lock);
5037
5038 /* trash all of the cap flushes for this inode */
5039 while (!list_empty(&ci->i_cap_flush_list)) {
5040 cf = list_first_entry(&ci->i_cap_flush_list,
5041 struct ceph_cap_flush, i_list);
5042 list_del_init(&cf->g_list);
5043 list_del_init(&cf->i_list);
5044 if (!cf->is_capsnap)
5045 ceph_free_cap_flush(cf);
5046 }
5047
5048 if (!list_empty(&ci->i_dirty_item)) {
5049 pr_warn_ratelimited_client(cl,
5050 " dropping dirty %s state for %p %llx.%llx\n",
5051 ceph_cap_string(ci->i_dirty_caps),
5052 inode, ceph_vinop(inode));
5053 ci->i_dirty_caps = 0;
5054 list_del_init(&ci->i_dirty_item);
5055 dirty_dropped = true;
5056 }
5057 if (!list_empty(&ci->i_flushing_item)) {
5058 pr_warn_ratelimited_client(cl,
5059 " dropping dirty+flushing %s state for %p %llx.%llx\n",
5060 ceph_cap_string(ci->i_flushing_caps),
5061 inode, ceph_vinop(inode));
5062 ci->i_flushing_caps = 0;
5063 list_del_init(&ci->i_flushing_item);
5064 mdsc->num_cap_flushing--;
5065 dirty_dropped = true;
5066 }
5067 spin_unlock(&mdsc->cap_dirty_lock);
5068
5069 if (dirty_dropped) {
5070 mapping_set_error(inode->i_mapping, -EIO);
5071
5072 if (ci->i_wrbuffer_ref_head == 0 &&
5073 ci->i_wr_ref == 0 &&
5074 ci->i_dirty_caps == 0 &&
5075 ci->i_flushing_caps == 0) {
5076 ceph_put_snap_context(ci->i_head_snapc);
5077 ci->i_head_snapc = NULL;
5078 }
5079 }
5080
5081 if (atomic_read(&ci->i_filelock_ref) > 0) {
5082 /* make further file lock syscall return -EIO */
5083 ci->i_ceph_flags |= CEPH_I_ERROR_FILELOCK;
5084 pr_warn_ratelimited_client(cl,
5085 " dropping file locks for %p %llx.%llx\n",
5086 inode, ceph_vinop(inode));
5087 }
5088
5089 if (!ci->i_dirty_caps && ci->i_prealloc_cap_flush) {
5090 cf = ci->i_prealloc_cap_flush;
5091 ci->i_prealloc_cap_flush = NULL;
5092 if (!cf->is_capsnap)
5093 ceph_free_cap_flush(cf);
5094 }
5095
5096 if (!list_empty(&ci->i_cap_snaps))
5097 iputs = remove_capsnaps(mdsc, inode);
5098 }
5099 if (dirty_dropped)
5100 ++iputs;
5101 return iputs;
5102}