1
2#include <linux/ceph/ceph_debug.h>
3
4#include <linux/fs.h>
5#include <linux/wait.h>
6#include <linux/slab.h>
7#include <linux/gfp.h>
8#include <linux/sched.h>
9#include <linux/debugfs.h>
10#include <linux/seq_file.h>
11#include <linux/ratelimit.h>
12#include <linux/bits.h>
13#include <linux/ktime.h>
14
15#include "super.h"
16#include "mds_client.h"
17
18#include <linux/ceph/ceph_features.h>
19#include <linux/ceph/messenger.h>
20#include <linux/ceph/decode.h>
21#include <linux/ceph/pagelist.h>
22#include <linux/ceph/auth.h>
23#include <linux/ceph/debugfs.h>
24
25#define RECONNECT_MAX_SIZE (INT_MAX - PAGE_SIZE)
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52struct ceph_reconnect_state {
53 struct ceph_mds_session *session;
54 int nr_caps, nr_realms;
55 struct ceph_pagelist *pagelist;
56 unsigned msg_version;
57 bool allow_multi;
58};
59
60static void __wake_requests(struct ceph_mds_client *mdsc,
61 struct list_head *head);
62static void ceph_cap_release_work(struct work_struct *work);
63static void ceph_cap_reclaim_work(struct work_struct *work);
64
65static const struct ceph_connection_operations mds_con_ops;
66
67
68
69
70
71
72static int parse_reply_info_quota(void **p, void *end,
73 struct ceph_mds_reply_info_in *info)
74{
75 u8 struct_v, struct_compat;
76 u32 struct_len;
77
78 ceph_decode_8_safe(p, end, struct_v, bad);
79 ceph_decode_8_safe(p, end, struct_compat, bad);
80
81
82 if (!struct_v || struct_compat != 1)
83 goto bad;
84 ceph_decode_32_safe(p, end, struct_len, bad);
85 ceph_decode_need(p, end, struct_len, bad);
86 end = *p + struct_len;
87 ceph_decode_64_safe(p, end, info->max_bytes, bad);
88 ceph_decode_64_safe(p, end, info->max_files, bad);
89 *p = end;
90 return 0;
91bad:
92 return -EIO;
93}
94
95
96
97
98static int parse_reply_info_in(void **p, void *end,
99 struct ceph_mds_reply_info_in *info,
100 u64 features)
101{
102 int err = 0;
103 u8 struct_v = 0;
104
105 if (features == (u64)-1) {
106 u32 struct_len;
107 u8 struct_compat;
108 ceph_decode_8_safe(p, end, struct_v, bad);
109 ceph_decode_8_safe(p, end, struct_compat, bad);
110
111
112 if (!struct_v || struct_compat != 1)
113 goto bad;
114 ceph_decode_32_safe(p, end, struct_len, bad);
115 ceph_decode_need(p, end, struct_len, bad);
116 end = *p + struct_len;
117 }
118
119 ceph_decode_need(p, end, sizeof(struct ceph_mds_reply_inode), bad);
120 info->in = *p;
121 *p += sizeof(struct ceph_mds_reply_inode) +
122 sizeof(*info->in->fragtree.splits) *
123 le32_to_cpu(info->in->fragtree.nsplits);
124
125 ceph_decode_32_safe(p, end, info->symlink_len, bad);
126 ceph_decode_need(p, end, info->symlink_len, bad);
127 info->symlink = *p;
128 *p += info->symlink_len;
129
130 ceph_decode_copy_safe(p, end, &info->dir_layout,
131 sizeof(info->dir_layout), bad);
132 ceph_decode_32_safe(p, end, info->xattr_len, bad);
133 ceph_decode_need(p, end, info->xattr_len, bad);
134 info->xattr_data = *p;
135 *p += info->xattr_len;
136
137 if (features == (u64)-1) {
138
139 ceph_decode_64_safe(p, end, info->inline_version, bad);
140 ceph_decode_32_safe(p, end, info->inline_len, bad);
141 ceph_decode_need(p, end, info->inline_len, bad);
142 info->inline_data = *p;
143 *p += info->inline_len;
144
145 err = parse_reply_info_quota(p, end, info);
146 if (err < 0)
147 goto out_bad;
148
149 ceph_decode_32_safe(p, end, info->pool_ns_len, bad);
150 if (info->pool_ns_len > 0) {
151 ceph_decode_need(p, end, info->pool_ns_len, bad);
152 info->pool_ns_data = *p;
153 *p += info->pool_ns_len;
154 }
155
156
157 ceph_decode_need(p, end, sizeof(info->btime), bad);
158 ceph_decode_copy(p, &info->btime, sizeof(info->btime));
159
160
161 ceph_decode_64_safe(p, end, info->change_attr, bad);
162
163
164 if (struct_v >= 2) {
165 ceph_decode_32_safe(p, end, info->dir_pin, bad);
166 } else {
167 info->dir_pin = -ENODATA;
168 }
169
170
171 if (struct_v >= 3) {
172 ceph_decode_need(p, end, sizeof(info->snap_btime), bad);
173 ceph_decode_copy(p, &info->snap_btime,
174 sizeof(info->snap_btime));
175 } else {
176 memset(&info->snap_btime, 0, sizeof(info->snap_btime));
177 }
178
179
180 if (struct_v >= 4) {
181 ceph_decode_64_safe(p, end, info->rsnaps, bad);
182 } else {
183 info->rsnaps = 0;
184 }
185
186 *p = end;
187 } else {
188 if (features & CEPH_FEATURE_MDS_INLINE_DATA) {
189 ceph_decode_64_safe(p, end, info->inline_version, bad);
190 ceph_decode_32_safe(p, end, info->inline_len, bad);
191 ceph_decode_need(p, end, info->inline_len, bad);
192 info->inline_data = *p;
193 *p += info->inline_len;
194 } else
195 info->inline_version = CEPH_INLINE_NONE;
196
197 if (features & CEPH_FEATURE_MDS_QUOTA) {
198 err = parse_reply_info_quota(p, end, info);
199 if (err < 0)
200 goto out_bad;
201 } else {
202 info->max_bytes = 0;
203 info->max_files = 0;
204 }
205
206 info->pool_ns_len = 0;
207 info->pool_ns_data = NULL;
208 if (features & CEPH_FEATURE_FS_FILE_LAYOUT_V2) {
209 ceph_decode_32_safe(p, end, info->pool_ns_len, bad);
210 if (info->pool_ns_len > 0) {
211 ceph_decode_need(p, end, info->pool_ns_len, bad);
212 info->pool_ns_data = *p;
213 *p += info->pool_ns_len;
214 }
215 }
216
217 if (features & CEPH_FEATURE_FS_BTIME) {
218 ceph_decode_need(p, end, sizeof(info->btime), bad);
219 ceph_decode_copy(p, &info->btime, sizeof(info->btime));
220 ceph_decode_64_safe(p, end, info->change_attr, bad);
221 }
222
223 info->dir_pin = -ENODATA;
224
225 }
226 return 0;
227bad:
228 err = -EIO;
229out_bad:
230 return err;
231}
232
233static int parse_reply_info_dir(void **p, void *end,
234 struct ceph_mds_reply_dirfrag **dirfrag,
235 u64 features)
236{
237 if (features == (u64)-1) {
238 u8 struct_v, struct_compat;
239 u32 struct_len;
240 ceph_decode_8_safe(p, end, struct_v, bad);
241 ceph_decode_8_safe(p, end, struct_compat, bad);
242
243
244 if (!struct_v || struct_compat != 1)
245 goto bad;
246 ceph_decode_32_safe(p, end, struct_len, bad);
247 ceph_decode_need(p, end, struct_len, bad);
248 end = *p + struct_len;
249 }
250
251 ceph_decode_need(p, end, sizeof(**dirfrag), bad);
252 *dirfrag = *p;
253 *p += sizeof(**dirfrag) + sizeof(u32) * le32_to_cpu((*dirfrag)->ndist);
254 if (unlikely(*p > end))
255 goto bad;
256 if (features == (u64)-1)
257 *p = end;
258 return 0;
259bad:
260 return -EIO;
261}
262
263static int parse_reply_info_lease(void **p, void *end,
264 struct ceph_mds_reply_lease **lease,
265 u64 features)
266{
267 if (features == (u64)-1) {
268 u8 struct_v, struct_compat;
269 u32 struct_len;
270 ceph_decode_8_safe(p, end, struct_v, bad);
271 ceph_decode_8_safe(p, end, struct_compat, bad);
272
273
274 if (!struct_v || struct_compat != 1)
275 goto bad;
276 ceph_decode_32_safe(p, end, struct_len, bad);
277 ceph_decode_need(p, end, struct_len, bad);
278 end = *p + struct_len;
279 }
280
281 ceph_decode_need(p, end, sizeof(**lease), bad);
282 *lease = *p;
283 *p += sizeof(**lease);
284 if (features == (u64)-1)
285 *p = end;
286 return 0;
287bad:
288 return -EIO;
289}
290
291
292
293
294
295static int parse_reply_info_trace(void **p, void *end,
296 struct ceph_mds_reply_info_parsed *info,
297 u64 features)
298{
299 int err;
300
301 if (info->head->is_dentry) {
302 err = parse_reply_info_in(p, end, &info->diri, features);
303 if (err < 0)
304 goto out_bad;
305
306 err = parse_reply_info_dir(p, end, &info->dirfrag, features);
307 if (err < 0)
308 goto out_bad;
309
310 ceph_decode_32_safe(p, end, info->dname_len, bad);
311 ceph_decode_need(p, end, info->dname_len, bad);
312 info->dname = *p;
313 *p += info->dname_len;
314
315 err = parse_reply_info_lease(p, end, &info->dlease, features);
316 if (err < 0)
317 goto out_bad;
318 }
319
320 if (info->head->is_target) {
321 err = parse_reply_info_in(p, end, &info->targeti, features);
322 if (err < 0)
323 goto out_bad;
324 }
325
326 if (unlikely(*p != end))
327 goto bad;
328 return 0;
329
330bad:
331 err = -EIO;
332out_bad:
333 pr_err("problem parsing mds trace %d\n", err);
334 return err;
335}
336
337
338
339
340static int parse_reply_info_readdir(void **p, void *end,
341 struct ceph_mds_reply_info_parsed *info,
342 u64 features)
343{
344 u32 num, i = 0;
345 int err;
346
347 err = parse_reply_info_dir(p, end, &info->dir_dir, features);
348 if (err < 0)
349 goto out_bad;
350
351 ceph_decode_need(p, end, sizeof(num) + 2, bad);
352 num = ceph_decode_32(p);
353 {
354 u16 flags = ceph_decode_16(p);
355 info->dir_end = !!(flags & CEPH_READDIR_FRAG_END);
356 info->dir_complete = !!(flags & CEPH_READDIR_FRAG_COMPLETE);
357 info->hash_order = !!(flags & CEPH_READDIR_HASH_ORDER);
358 info->offset_hash = !!(flags & CEPH_READDIR_OFFSET_HASH);
359 }
360 if (num == 0)
361 goto done;
362
363 BUG_ON(!info->dir_entries);
364 if ((unsigned long)(info->dir_entries + num) >
365 (unsigned long)info->dir_entries + info->dir_buf_size) {
366 pr_err("dir contents are larger than expected\n");
367 WARN_ON(1);
368 goto bad;
369 }
370
371 info->dir_nr = num;
372 while (num) {
373 struct ceph_mds_reply_dir_entry *rde = info->dir_entries + i;
374
375 ceph_decode_32_safe(p, end, rde->name_len, bad);
376 ceph_decode_need(p, end, rde->name_len, bad);
377 rde->name = *p;
378 *p += rde->name_len;
379 dout("parsed dir dname '%.*s'\n", rde->name_len, rde->name);
380
381
382 err = parse_reply_info_lease(p, end, &rde->lease, features);
383 if (err)
384 goto out_bad;
385
386 err = parse_reply_info_in(p, end, &rde->inode, features);
387 if (err < 0)
388 goto out_bad;
389
390 rde->offset = 0;
391 i++;
392 num--;
393 }
394
395done:
396
397 *p = end;
398 return 0;
399
400bad:
401 err = -EIO;
402out_bad:
403 pr_err("problem parsing dir contents %d\n", err);
404 return err;
405}
406
407
408
409
410static int parse_reply_info_filelock(void **p, void *end,
411 struct ceph_mds_reply_info_parsed *info,
412 u64 features)
413{
414 if (*p + sizeof(*info->filelock_reply) > end)
415 goto bad;
416
417 info->filelock_reply = *p;
418
419
420 *p = end;
421 return 0;
422bad:
423 return -EIO;
424}
425
426
427#if BITS_PER_LONG == 64
428
429#define DELEGATED_INO_AVAILABLE xa_mk_value(1)
430
431static int ceph_parse_deleg_inos(void **p, void *end,
432 struct ceph_mds_session *s)
433{
434 u32 sets;
435
436 ceph_decode_32_safe(p, end, sets, bad);
437 dout("got %u sets of delegated inodes\n", sets);
438 while (sets--) {
439 u64 start, len, ino;
440
441 ceph_decode_64_safe(p, end, start, bad);
442 ceph_decode_64_safe(p, end, len, bad);
443
444
445 if (start < CEPH_INO_SYSTEM_BASE) {
446 pr_warn_ratelimited("ceph: ignoring reserved inode range delegation (start=0x%llx len=0x%llx)\n",
447 start, len);
448 continue;
449 }
450 while (len--) {
451 int err = xa_insert(&s->s_delegated_inos, ino = start++,
452 DELEGATED_INO_AVAILABLE,
453 GFP_KERNEL);
454 if (!err) {
455 dout("added delegated inode 0x%llx\n",
456 start - 1);
457 } else if (err == -EBUSY) {
458 pr_warn("ceph: MDS delegated inode 0x%llx more than once.\n",
459 start - 1);
460 } else {
461 return err;
462 }
463 }
464 }
465 return 0;
466bad:
467 return -EIO;
468}
469
470u64 ceph_get_deleg_ino(struct ceph_mds_session *s)
471{
472 unsigned long ino;
473 void *val;
474
475 xa_for_each(&s->s_delegated_inos, ino, val) {
476 val = xa_erase(&s->s_delegated_inos, ino);
477 if (val == DELEGATED_INO_AVAILABLE)
478 return ino;
479 }
480 return 0;
481}
482
483int ceph_restore_deleg_ino(struct ceph_mds_session *s, u64 ino)
484{
485 return xa_insert(&s->s_delegated_inos, ino, DELEGATED_INO_AVAILABLE,
486 GFP_KERNEL);
487}
488#else
489
490
491
492
493
494static int ceph_parse_deleg_inos(void **p, void *end,
495 struct ceph_mds_session *s)
496{
497 u32 sets;
498
499 ceph_decode_32_safe(p, end, sets, bad);
500 if (sets)
501 ceph_decode_skip_n(p, end, sets * 2 * sizeof(__le64), bad);
502 return 0;
503bad:
504 return -EIO;
505}
506
507u64 ceph_get_deleg_ino(struct ceph_mds_session *s)
508{
509 return 0;
510}
511
512int ceph_restore_deleg_ino(struct ceph_mds_session *s, u64 ino)
513{
514 return 0;
515}
516#endif
517
518
519
520
521static int parse_reply_info_create(void **p, void *end,
522 struct ceph_mds_reply_info_parsed *info,
523 u64 features, struct ceph_mds_session *s)
524{
525 int ret;
526
527 if (features == (u64)-1 ||
528 (features & CEPH_FEATURE_REPLY_CREATE_INODE)) {
529 if (*p == end) {
530
531 info->has_create_ino = false;
532 } else if (test_bit(CEPHFS_FEATURE_DELEG_INO, &s->s_features)) {
533 info->has_create_ino = true;
534
535 ceph_decode_skip_n(p, end, 2 + sizeof(u32), bad);
536 ceph_decode_64_safe(p, end, info->ino, bad);
537 ret = ceph_parse_deleg_inos(p, end, s);
538 if (ret)
539 return ret;
540 } else {
541
542 ceph_decode_64_safe(p, end, info->ino, bad);
543 info->has_create_ino = true;
544 }
545 } else {
546 if (*p != end)
547 goto bad;
548 }
549
550
551 *p = end;
552 return 0;
553bad:
554 return -EIO;
555}
556
557
558
559
560static int parse_reply_info_extra(void **p, void *end,
561 struct ceph_mds_reply_info_parsed *info,
562 u64 features, struct ceph_mds_session *s)
563{
564 u32 op = le32_to_cpu(info->head->op);
565
566 if (op == CEPH_MDS_OP_GETFILELOCK)
567 return parse_reply_info_filelock(p, end, info, features);
568 else if (op == CEPH_MDS_OP_READDIR || op == CEPH_MDS_OP_LSSNAP)
569 return parse_reply_info_readdir(p, end, info, features);
570 else if (op == CEPH_MDS_OP_CREATE)
571 return parse_reply_info_create(p, end, info, features, s);
572 else
573 return -EIO;
574}
575
576
577
578
579static int parse_reply_info(struct ceph_mds_session *s, struct ceph_msg *msg,
580 struct ceph_mds_reply_info_parsed *info,
581 u64 features)
582{
583 void *p, *end;
584 u32 len;
585 int err;
586
587 info->head = msg->front.iov_base;
588 p = msg->front.iov_base + sizeof(struct ceph_mds_reply_head);
589 end = p + msg->front.iov_len - sizeof(struct ceph_mds_reply_head);
590
591
592 ceph_decode_32_safe(&p, end, len, bad);
593 if (len > 0) {
594 ceph_decode_need(&p, end, len, bad);
595 err = parse_reply_info_trace(&p, p+len, info, features);
596 if (err < 0)
597 goto out_bad;
598 }
599
600
601 ceph_decode_32_safe(&p, end, len, bad);
602 if (len > 0) {
603 ceph_decode_need(&p, end, len, bad);
604 err = parse_reply_info_extra(&p, p+len, info, features, s);
605 if (err < 0)
606 goto out_bad;
607 }
608
609
610 ceph_decode_32_safe(&p, end, len, bad);
611 info->snapblob_len = len;
612 info->snapblob = p;
613 p += len;
614
615 if (p != end)
616 goto bad;
617 return 0;
618
619bad:
620 err = -EIO;
621out_bad:
622 pr_err("mds parse_reply err %d\n", err);
623 return err;
624}
625
626static void destroy_reply_info(struct ceph_mds_reply_info_parsed *info)
627{
628 if (!info->dir_entries)
629 return;
630 free_pages((unsigned long)info->dir_entries, get_order(info->dir_buf_size));
631}
632
633
634
635
636
637const char *ceph_session_state_name(int s)
638{
639 switch (s) {
640 case CEPH_MDS_SESSION_NEW: return "new";
641 case CEPH_MDS_SESSION_OPENING: return "opening";
642 case CEPH_MDS_SESSION_OPEN: return "open";
643 case CEPH_MDS_SESSION_HUNG: return "hung";
644 case CEPH_MDS_SESSION_CLOSING: return "closing";
645 case CEPH_MDS_SESSION_CLOSED: return "closed";
646 case CEPH_MDS_SESSION_RESTARTING: return "restarting";
647 case CEPH_MDS_SESSION_RECONNECTING: return "reconnecting";
648 case CEPH_MDS_SESSION_REJECTED: return "rejected";
649 default: return "???";
650 }
651}
652
653struct ceph_mds_session *ceph_get_mds_session(struct ceph_mds_session *s)
654{
655 if (refcount_inc_not_zero(&s->s_ref)) {
656 dout("mdsc get_session %p %d -> %d\n", s,
657 refcount_read(&s->s_ref)-1, refcount_read(&s->s_ref));
658 return s;
659 } else {
660 dout("mdsc get_session %p 0 -- FAIL\n", s);
661 return NULL;
662 }
663}
664
665void ceph_put_mds_session(struct ceph_mds_session *s)
666{
667 if (IS_ERR_OR_NULL(s))
668 return;
669
670 dout("mdsc put_session %p %d -> %d\n", s,
671 refcount_read(&s->s_ref), refcount_read(&s->s_ref)-1);
672 if (refcount_dec_and_test(&s->s_ref)) {
673 if (s->s_auth.authorizer)
674 ceph_auth_destroy_authorizer(s->s_auth.authorizer);
675 WARN_ON(mutex_is_locked(&s->s_mutex));
676 xa_destroy(&s->s_delegated_inos);
677 kfree(s);
678 }
679}
680
681
682
683
684struct ceph_mds_session *__ceph_lookup_mds_session(struct ceph_mds_client *mdsc,
685 int mds)
686{
687 if (mds >= mdsc->max_sessions || !mdsc->sessions[mds])
688 return NULL;
689 return ceph_get_mds_session(mdsc->sessions[mds]);
690}
691
692static bool __have_session(struct ceph_mds_client *mdsc, int mds)
693{
694 if (mds >= mdsc->max_sessions || !mdsc->sessions[mds])
695 return false;
696 else
697 return true;
698}
699
700static int __verify_registered_session(struct ceph_mds_client *mdsc,
701 struct ceph_mds_session *s)
702{
703 if (s->s_mds >= mdsc->max_sessions ||
704 mdsc->sessions[s->s_mds] != s)
705 return -ENOENT;
706 return 0;
707}
708
709
710
711
712
713static struct ceph_mds_session *register_session(struct ceph_mds_client *mdsc,
714 int mds)
715{
716 struct ceph_mds_session *s;
717
718 if (mds >= mdsc->mdsmap->possible_max_rank)
719 return ERR_PTR(-EINVAL);
720
721 s = kzalloc(sizeof(*s), GFP_NOFS);
722 if (!s)
723 return ERR_PTR(-ENOMEM);
724
725 if (mds >= mdsc->max_sessions) {
726 int newmax = 1 << get_count_order(mds + 1);
727 struct ceph_mds_session **sa;
728
729 dout("%s: realloc to %d\n", __func__, newmax);
730 sa = kcalloc(newmax, sizeof(void *), GFP_NOFS);
731 if (!sa)
732 goto fail_realloc;
733 if (mdsc->sessions) {
734 memcpy(sa, mdsc->sessions,
735 mdsc->max_sessions * sizeof(void *));
736 kfree(mdsc->sessions);
737 }
738 mdsc->sessions = sa;
739 mdsc->max_sessions = newmax;
740 }
741
742 dout("%s: mds%d\n", __func__, mds);
743 s->s_mdsc = mdsc;
744 s->s_mds = mds;
745 s->s_state = CEPH_MDS_SESSION_NEW;
746 s->s_ttl = 0;
747 s->s_seq = 0;
748 mutex_init(&s->s_mutex);
749
750 ceph_con_init(&s->s_con, s, &mds_con_ops, &mdsc->fsc->client->msgr);
751
752 atomic_set(&s->s_cap_gen, 1);
753 s->s_cap_ttl = jiffies - 1;
754
755 spin_lock_init(&s->s_cap_lock);
756 s->s_renew_requested = 0;
757 s->s_renew_seq = 0;
758 INIT_LIST_HEAD(&s->s_caps);
759 s->s_nr_caps = 0;
760 refcount_set(&s->s_ref, 1);
761 INIT_LIST_HEAD(&s->s_waiting);
762 INIT_LIST_HEAD(&s->s_unsafe);
763 xa_init(&s->s_delegated_inos);
764 s->s_num_cap_releases = 0;
765 s->s_cap_reconnect = 0;
766 s->s_cap_iterator = NULL;
767 INIT_LIST_HEAD(&s->s_cap_releases);
768 INIT_WORK(&s->s_cap_release_work, ceph_cap_release_work);
769
770 INIT_LIST_HEAD(&s->s_cap_dirty);
771 INIT_LIST_HEAD(&s->s_cap_flushing);
772
773 mdsc->sessions[mds] = s;
774 atomic_inc(&mdsc->num_sessions);
775 refcount_inc(&s->s_ref);
776
777 ceph_con_open(&s->s_con, CEPH_ENTITY_TYPE_MDS, mds,
778 ceph_mdsmap_get_addr(mdsc->mdsmap, mds));
779
780 return s;
781
782fail_realloc:
783 kfree(s);
784 return ERR_PTR(-ENOMEM);
785}
786
787
788
789
790static void __unregister_session(struct ceph_mds_client *mdsc,
791 struct ceph_mds_session *s)
792{
793 dout("__unregister_session mds%d %p\n", s->s_mds, s);
794 BUG_ON(mdsc->sessions[s->s_mds] != s);
795 mdsc->sessions[s->s_mds] = NULL;
796 ceph_con_close(&s->s_con);
797 ceph_put_mds_session(s);
798 atomic_dec(&mdsc->num_sessions);
799}
800
801
802
803
804
805
806static void put_request_session(struct ceph_mds_request *req)
807{
808 if (req->r_session) {
809 ceph_put_mds_session(req->r_session);
810 req->r_session = NULL;
811 }
812}
813
814void ceph_mdsc_release_request(struct kref *kref)
815{
816 struct ceph_mds_request *req = container_of(kref,
817 struct ceph_mds_request,
818 r_kref);
819 ceph_mdsc_release_dir_caps_no_check(req);
820 destroy_reply_info(&req->r_reply_info);
821 if (req->r_request)
822 ceph_msg_put(req->r_request);
823 if (req->r_reply)
824 ceph_msg_put(req->r_reply);
825 if (req->r_inode) {
826 ceph_put_cap_refs(ceph_inode(req->r_inode), CEPH_CAP_PIN);
827 iput(req->r_inode);
828 }
829 if (req->r_parent) {
830 ceph_put_cap_refs(ceph_inode(req->r_parent), CEPH_CAP_PIN);
831 iput(req->r_parent);
832 }
833 iput(req->r_target_inode);
834 if (req->r_dentry)
835 dput(req->r_dentry);
836 if (req->r_old_dentry)
837 dput(req->r_old_dentry);
838 if (req->r_old_dentry_dir) {
839
840
841
842
843
844
845 ceph_put_cap_refs(ceph_inode(req->r_old_dentry_dir),
846 CEPH_CAP_PIN);
847 iput(req->r_old_dentry_dir);
848 }
849 kfree(req->r_path1);
850 kfree(req->r_path2);
851 put_cred(req->r_cred);
852 if (req->r_pagelist)
853 ceph_pagelist_release(req->r_pagelist);
854 put_request_session(req);
855 ceph_unreserve_caps(req->r_mdsc, &req->r_caps_reservation);
856 WARN_ON_ONCE(!list_empty(&req->r_wait));
857 kmem_cache_free(ceph_mds_request_cachep, req);
858}
859
860DEFINE_RB_FUNCS(request, struct ceph_mds_request, r_tid, r_node)
861
862
863
864
865
866
867static struct ceph_mds_request *
868lookup_get_request(struct ceph_mds_client *mdsc, u64 tid)
869{
870 struct ceph_mds_request *req;
871
872 req = lookup_request(&mdsc->request_tree, tid);
873 if (req)
874 ceph_mdsc_get_request(req);
875
876 return req;
877}
878
879
880
881
882
883
884
885static void __register_request(struct ceph_mds_client *mdsc,
886 struct ceph_mds_request *req,
887 struct inode *dir)
888{
889 int ret = 0;
890
891 req->r_tid = ++mdsc->last_tid;
892 if (req->r_num_caps) {
893 ret = ceph_reserve_caps(mdsc, &req->r_caps_reservation,
894 req->r_num_caps);
895 if (ret < 0) {
896 pr_err("__register_request %p "
897 "failed to reserve caps: %d\n", req, ret);
898
899 req->r_err = ret;
900 return;
901 }
902 }
903 dout("__register_request %p tid %lld\n", req, req->r_tid);
904 ceph_mdsc_get_request(req);
905 insert_request(&mdsc->request_tree, req);
906
907 req->r_cred = get_current_cred();
908
909 if (mdsc->oldest_tid == 0 && req->r_op != CEPH_MDS_OP_SETFILELOCK)
910 mdsc->oldest_tid = req->r_tid;
911
912 if (dir) {
913 struct ceph_inode_info *ci = ceph_inode(dir);
914
915 ihold(dir);
916 req->r_unsafe_dir = dir;
917 spin_lock(&ci->i_unsafe_lock);
918 list_add_tail(&req->r_unsafe_dir_item, &ci->i_unsafe_dirops);
919 spin_unlock(&ci->i_unsafe_lock);
920 }
921}
922
923static void __unregister_request(struct ceph_mds_client *mdsc,
924 struct ceph_mds_request *req)
925{
926 dout("__unregister_request %p tid %lld\n", req, req->r_tid);
927
928
929 list_del_init(&req->r_unsafe_item);
930
931 if (req->r_tid == mdsc->oldest_tid) {
932 struct rb_node *p = rb_next(&req->r_node);
933 mdsc->oldest_tid = 0;
934 while (p) {
935 struct ceph_mds_request *next_req =
936 rb_entry(p, struct ceph_mds_request, r_node);
937 if (next_req->r_op != CEPH_MDS_OP_SETFILELOCK) {
938 mdsc->oldest_tid = next_req->r_tid;
939 break;
940 }
941 p = rb_next(p);
942 }
943 }
944
945 erase_request(&mdsc->request_tree, req);
946
947 if (req->r_unsafe_dir) {
948 struct ceph_inode_info *ci = ceph_inode(req->r_unsafe_dir);
949 spin_lock(&ci->i_unsafe_lock);
950 list_del_init(&req->r_unsafe_dir_item);
951 spin_unlock(&ci->i_unsafe_lock);
952 }
953 if (req->r_target_inode &&
954 test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) {
955 struct ceph_inode_info *ci = ceph_inode(req->r_target_inode);
956 spin_lock(&ci->i_unsafe_lock);
957 list_del_init(&req->r_unsafe_target_item);
958 spin_unlock(&ci->i_unsafe_lock);
959 }
960
961 if (req->r_unsafe_dir) {
962 iput(req->r_unsafe_dir);
963 req->r_unsafe_dir = NULL;
964 }
965
966 complete_all(&req->r_safe_completion);
967
968 ceph_mdsc_put_request(req);
969}
970
971
972
973
974
975
976
977
978static struct inode *get_nonsnap_parent(struct dentry *dentry)
979{
980 struct inode *inode = NULL;
981
982 while (dentry && !IS_ROOT(dentry)) {
983 inode = d_inode_rcu(dentry);
984 if (!inode || ceph_snap(inode) == CEPH_NOSNAP)
985 break;
986 dentry = dentry->d_parent;
987 }
988 if (inode)
989 inode = igrab(inode);
990 return inode;
991}
992
993
994
995
996
997
998
999
1000
1001static int __choose_mds(struct ceph_mds_client *mdsc,
1002 struct ceph_mds_request *req,
1003 bool *random)
1004{
1005 struct inode *inode;
1006 struct ceph_inode_info *ci;
1007 struct ceph_cap *cap;
1008 int mode = req->r_direct_mode;
1009 int mds = -1;
1010 u32 hash = req->r_direct_hash;
1011 bool is_hash = test_bit(CEPH_MDS_R_DIRECT_IS_HASH, &req->r_req_flags);
1012
1013 if (random)
1014 *random = false;
1015
1016
1017
1018
1019
1020 if (req->r_resend_mds >= 0 &&
1021 (__have_session(mdsc, req->r_resend_mds) ||
1022 ceph_mdsmap_get_state(mdsc->mdsmap, req->r_resend_mds) > 0)) {
1023 dout("%s using resend_mds mds%d\n", __func__,
1024 req->r_resend_mds);
1025 return req->r_resend_mds;
1026 }
1027
1028 if (mode == USE_RANDOM_MDS)
1029 goto random;
1030
1031 inode = NULL;
1032 if (req->r_inode) {
1033 if (ceph_snap(req->r_inode) != CEPH_SNAPDIR) {
1034 inode = req->r_inode;
1035 ihold(inode);
1036 } else {
1037
1038 rcu_read_lock();
1039 inode = get_nonsnap_parent(req->r_dentry);
1040 rcu_read_unlock();
1041 dout("%s using snapdir's parent %p\n", __func__, inode);
1042 }
1043 } else if (req->r_dentry) {
1044
1045 struct dentry *parent;
1046 struct inode *dir;
1047
1048 rcu_read_lock();
1049 parent = READ_ONCE(req->r_dentry->d_parent);
1050 dir = req->r_parent ? : d_inode_rcu(parent);
1051
1052 if (!dir || dir->i_sb != mdsc->fsc->sb) {
1053
1054 inode = d_inode(req->r_dentry);
1055 if (inode)
1056 ihold(inode);
1057 } else if (ceph_snap(dir) != CEPH_NOSNAP) {
1058
1059
1060 inode = get_nonsnap_parent(parent);
1061 dout("%s using nonsnap parent %p\n", __func__, inode);
1062 } else {
1063
1064 inode = d_inode(req->r_dentry);
1065 if (!inode || mode == USE_AUTH_MDS) {
1066
1067 inode = igrab(dir);
1068 hash = ceph_dentry_hash(dir, req->r_dentry);
1069 is_hash = true;
1070 } else {
1071 ihold(inode);
1072 }
1073 }
1074 rcu_read_unlock();
1075 }
1076
1077 dout("%s %p is_hash=%d (0x%x) mode %d\n", __func__, inode, (int)is_hash,
1078 hash, mode);
1079 if (!inode)
1080 goto random;
1081 ci = ceph_inode(inode);
1082
1083 if (is_hash && S_ISDIR(inode->i_mode)) {
1084 struct ceph_inode_frag frag;
1085 int found;
1086
1087 ceph_choose_frag(ci, hash, &frag, &found);
1088 if (found) {
1089 if (mode == USE_ANY_MDS && frag.ndist > 0) {
1090 u8 r;
1091
1092
1093 get_random_bytes(&r, 1);
1094 r %= frag.ndist;
1095 mds = frag.dist[r];
1096 dout("%s %p %llx.%llx frag %u mds%d (%d/%d)\n",
1097 __func__, inode, ceph_vinop(inode),
1098 frag.frag, mds, (int)r, frag.ndist);
1099 if (ceph_mdsmap_get_state(mdsc->mdsmap, mds) >=
1100 CEPH_MDS_STATE_ACTIVE &&
1101 !ceph_mdsmap_is_laggy(mdsc->mdsmap, mds))
1102 goto out;
1103 }
1104
1105
1106
1107
1108 if (frag.mds >= 0) {
1109
1110 mds = frag.mds;
1111 dout("%s %p %llx.%llx frag %u mds%d (auth)\n",
1112 __func__, inode, ceph_vinop(inode),
1113 frag.frag, mds);
1114 if (ceph_mdsmap_get_state(mdsc->mdsmap, mds) >=
1115 CEPH_MDS_STATE_ACTIVE) {
1116 if (!ceph_mdsmap_is_laggy(mdsc->mdsmap,
1117 mds))
1118 goto out;
1119 }
1120 }
1121 mode = USE_AUTH_MDS;
1122 }
1123 }
1124
1125 spin_lock(&ci->i_ceph_lock);
1126 cap = NULL;
1127 if (mode == USE_AUTH_MDS)
1128 cap = ci->i_auth_cap;
1129 if (!cap && !RB_EMPTY_ROOT(&ci->i_caps))
1130 cap = rb_entry(rb_first(&ci->i_caps), struct ceph_cap, ci_node);
1131 if (!cap) {
1132 spin_unlock(&ci->i_ceph_lock);
1133 iput(inode);
1134 goto random;
1135 }
1136 mds = cap->session->s_mds;
1137 dout("%s %p %llx.%llx mds%d (%scap %p)\n", __func__,
1138 inode, ceph_vinop(inode), mds,
1139 cap == ci->i_auth_cap ? "auth " : "", cap);
1140 spin_unlock(&ci->i_ceph_lock);
1141out:
1142 iput(inode);
1143 return mds;
1144
1145random:
1146 if (random)
1147 *random = true;
1148
1149 mds = ceph_mdsmap_get_random_mds(mdsc->mdsmap);
1150 dout("%s chose random mds%d\n", __func__, mds);
1151 return mds;
1152}
1153
1154
1155
1156
1157
1158static struct ceph_msg *create_session_msg(u32 op, u64 seq)
1159{
1160 struct ceph_msg *msg;
1161 struct ceph_mds_session_head *h;
1162
1163 msg = ceph_msg_new(CEPH_MSG_CLIENT_SESSION, sizeof(*h), GFP_NOFS,
1164 false);
1165 if (!msg) {
1166 pr_err("create_session_msg ENOMEM creating msg\n");
1167 return NULL;
1168 }
1169 h = msg->front.iov_base;
1170 h->op = cpu_to_le32(op);
1171 h->seq = cpu_to_le64(seq);
1172
1173 return msg;
1174}
1175
1176static const unsigned char feature_bits[] = CEPHFS_FEATURES_CLIENT_SUPPORTED;
1177#define FEATURE_BYTES(c) (DIV_ROUND_UP((size_t)feature_bits[c - 1] + 1, 64) * 8)
1178static int encode_supported_features(void **p, void *end)
1179{
1180 static const size_t count = ARRAY_SIZE(feature_bits);
1181
1182 if (count > 0) {
1183 size_t i;
1184 size_t size = FEATURE_BYTES(count);
1185
1186 if (WARN_ON_ONCE(*p + 4 + size > end))
1187 return -ERANGE;
1188
1189 ceph_encode_32(p, size);
1190 memset(*p, 0, size);
1191 for (i = 0; i < count; i++)
1192 ((unsigned char*)(*p))[i / 8] |= BIT(feature_bits[i] % 8);
1193 *p += size;
1194 } else {
1195 if (WARN_ON_ONCE(*p + 4 > end))
1196 return -ERANGE;
1197
1198 ceph_encode_32(p, 0);
1199 }
1200
1201 return 0;
1202}
1203
1204static const unsigned char metric_bits[] = CEPHFS_METRIC_SPEC_CLIENT_SUPPORTED;
1205#define METRIC_BYTES(cnt) (DIV_ROUND_UP((size_t)metric_bits[cnt - 1] + 1, 64) * 8)
1206static int encode_metric_spec(void **p, void *end)
1207{
1208 static const size_t count = ARRAY_SIZE(metric_bits);
1209
1210
1211 if (WARN_ON_ONCE(*p + 2 > end))
1212 return -ERANGE;
1213
1214 ceph_encode_8(p, 1);
1215 ceph_encode_8(p, 1);
1216
1217 if (count > 0) {
1218 size_t i;
1219 size_t size = METRIC_BYTES(count);
1220
1221 if (WARN_ON_ONCE(*p + 4 + 4 + size > end))
1222 return -ERANGE;
1223
1224
1225 ceph_encode_32(p, 4 + size);
1226
1227
1228 ceph_encode_32(p, size);
1229 memset(*p, 0, size);
1230 for (i = 0; i < count; i++)
1231 ((unsigned char *)(*p))[i / 8] |= BIT(metric_bits[i] % 8);
1232 *p += size;
1233 } else {
1234 if (WARN_ON_ONCE(*p + 4 + 4 > end))
1235 return -ERANGE;
1236
1237
1238 ceph_encode_32(p, 4);
1239
1240 ceph_encode_32(p, 0);
1241 }
1242
1243 return 0;
1244}
1245
1246
1247
1248
1249
1250static struct ceph_msg *create_session_open_msg(struct ceph_mds_client *mdsc, u64 seq)
1251{
1252 struct ceph_msg *msg;
1253 struct ceph_mds_session_head *h;
1254 int i;
1255 int extra_bytes = 0;
1256 int metadata_key_count = 0;
1257 struct ceph_options *opt = mdsc->fsc->client->options;
1258 struct ceph_mount_options *fsopt = mdsc->fsc->mount_options;
1259 size_t size, count;
1260 void *p, *end;
1261 int ret;
1262
1263 const char* metadata[][2] = {
1264 {"hostname", mdsc->nodename},
1265 {"kernel_version", init_utsname()->release},
1266 {"entity_id", opt->name ? : ""},
1267 {"root", fsopt->server_path ? : "/"},
1268 {NULL, NULL}
1269 };
1270
1271
1272 extra_bytes = 4;
1273 for (i = 0; metadata[i][0]; ++i) {
1274 extra_bytes += 8 + strlen(metadata[i][0]) +
1275 strlen(metadata[i][1]);
1276 metadata_key_count++;
1277 }
1278
1279
1280 size = 0;
1281 count = ARRAY_SIZE(feature_bits);
1282 if (count > 0)
1283 size = FEATURE_BYTES(count);
1284 extra_bytes += 4 + size;
1285
1286
1287 size = 0;
1288 count = ARRAY_SIZE(metric_bits);
1289 if (count > 0)
1290 size = METRIC_BYTES(count);
1291 extra_bytes += 2 + 4 + 4 + size;
1292
1293
1294 msg = ceph_msg_new(CEPH_MSG_CLIENT_SESSION, sizeof(*h) + extra_bytes,
1295 GFP_NOFS, false);
1296 if (!msg) {
1297 pr_err("create_session_msg ENOMEM creating msg\n");
1298 return ERR_PTR(-ENOMEM);
1299 }
1300 p = msg->front.iov_base;
1301 end = p + msg->front.iov_len;
1302
1303 h = p;
1304 h->op = cpu_to_le32(CEPH_SESSION_REQUEST_OPEN);
1305 h->seq = cpu_to_le64(seq);
1306
1307
1308
1309
1310
1311
1312
1313 msg->hdr.version = cpu_to_le16(4);
1314 msg->hdr.compat_version = cpu_to_le16(1);
1315
1316
1317 p += sizeof(*h);
1318
1319
1320 ceph_encode_32(&p, metadata_key_count);
1321
1322
1323 for (i = 0; metadata[i][0]; ++i) {
1324 size_t const key_len = strlen(metadata[i][0]);
1325 size_t const val_len = strlen(metadata[i][1]);
1326
1327 ceph_encode_32(&p, key_len);
1328 memcpy(p, metadata[i][0], key_len);
1329 p += key_len;
1330 ceph_encode_32(&p, val_len);
1331 memcpy(p, metadata[i][1], val_len);
1332 p += val_len;
1333 }
1334
1335 ret = encode_supported_features(&p, end);
1336 if (ret) {
1337 pr_err("encode_supported_features failed!\n");
1338 ceph_msg_put(msg);
1339 return ERR_PTR(ret);
1340 }
1341
1342 ret = encode_metric_spec(&p, end);
1343 if (ret) {
1344 pr_err("encode_metric_spec failed!\n");
1345 ceph_msg_put(msg);
1346 return ERR_PTR(ret);
1347 }
1348
1349 msg->front.iov_len = p - msg->front.iov_base;
1350 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
1351
1352 return msg;
1353}
1354
1355
1356
1357
1358
1359
1360static int __open_session(struct ceph_mds_client *mdsc,
1361 struct ceph_mds_session *session)
1362{
1363 struct ceph_msg *msg;
1364 int mstate;
1365 int mds = session->s_mds;
1366
1367
1368 mstate = ceph_mdsmap_get_state(mdsc->mdsmap, mds);
1369 dout("open_session to mds%d (%s)\n", mds,
1370 ceph_mds_state_name(mstate));
1371 session->s_state = CEPH_MDS_SESSION_OPENING;
1372 session->s_renew_requested = jiffies;
1373
1374
1375 msg = create_session_open_msg(mdsc, session->s_seq);
1376 if (IS_ERR(msg))
1377 return PTR_ERR(msg);
1378 ceph_con_send(&session->s_con, msg);
1379 return 0;
1380}
1381
1382
1383
1384
1385
1386
1387static struct ceph_mds_session *
1388__open_export_target_session(struct ceph_mds_client *mdsc, int target)
1389{
1390 struct ceph_mds_session *session;
1391 int ret;
1392
1393 session = __ceph_lookup_mds_session(mdsc, target);
1394 if (!session) {
1395 session = register_session(mdsc, target);
1396 if (IS_ERR(session))
1397 return session;
1398 }
1399 if (session->s_state == CEPH_MDS_SESSION_NEW ||
1400 session->s_state == CEPH_MDS_SESSION_CLOSING) {
1401 ret = __open_session(mdsc, session);
1402 if (ret)
1403 return ERR_PTR(ret);
1404 }
1405
1406 return session;
1407}
1408
1409struct ceph_mds_session *
1410ceph_mdsc_open_export_target_session(struct ceph_mds_client *mdsc, int target)
1411{
1412 struct ceph_mds_session *session;
1413
1414 dout("open_export_target_session to mds%d\n", target);
1415
1416 mutex_lock(&mdsc->mutex);
1417 session = __open_export_target_session(mdsc, target);
1418 mutex_unlock(&mdsc->mutex);
1419
1420 return session;
1421}
1422
1423static void __open_export_target_sessions(struct ceph_mds_client *mdsc,
1424 struct ceph_mds_session *session)
1425{
1426 struct ceph_mds_info *mi;
1427 struct ceph_mds_session *ts;
1428 int i, mds = session->s_mds;
1429
1430 if (mds >= mdsc->mdsmap->possible_max_rank)
1431 return;
1432
1433 mi = &mdsc->mdsmap->m_info[mds];
1434 dout("open_export_target_sessions for mds%d (%d targets)\n",
1435 session->s_mds, mi->num_export_targets);
1436
1437 for (i = 0; i < mi->num_export_targets; i++) {
1438 ts = __open_export_target_session(mdsc, mi->export_targets[i]);
1439 ceph_put_mds_session(ts);
1440 }
1441}
1442
1443void ceph_mdsc_open_export_target_sessions(struct ceph_mds_client *mdsc,
1444 struct ceph_mds_session *session)
1445{
1446 mutex_lock(&mdsc->mutex);
1447 __open_export_target_sessions(mdsc, session);
1448 mutex_unlock(&mdsc->mutex);
1449}
1450
1451
1452
1453
1454
1455static void detach_cap_releases(struct ceph_mds_session *session,
1456 struct list_head *target)
1457{
1458 lockdep_assert_held(&session->s_cap_lock);
1459
1460 list_splice_init(&session->s_cap_releases, target);
1461 session->s_num_cap_releases = 0;
1462 dout("dispose_cap_releases mds%d\n", session->s_mds);
1463}
1464
1465static void dispose_cap_releases(struct ceph_mds_client *mdsc,
1466 struct list_head *dispose)
1467{
1468 while (!list_empty(dispose)) {
1469 struct ceph_cap *cap;
1470
1471 cap = list_first_entry(dispose, struct ceph_cap, session_caps);
1472 list_del(&cap->session_caps);
1473 ceph_put_cap(mdsc, cap);
1474 }
1475}
1476
1477static void cleanup_session_requests(struct ceph_mds_client *mdsc,
1478 struct ceph_mds_session *session)
1479{
1480 struct ceph_mds_request *req;
1481 struct rb_node *p;
1482 struct ceph_inode_info *ci;
1483
1484 dout("cleanup_session_requests mds%d\n", session->s_mds);
1485 mutex_lock(&mdsc->mutex);
1486 while (!list_empty(&session->s_unsafe)) {
1487 req = list_first_entry(&session->s_unsafe,
1488 struct ceph_mds_request, r_unsafe_item);
1489 pr_warn_ratelimited(" dropping unsafe request %llu\n",
1490 req->r_tid);
1491 if (req->r_target_inode) {
1492
1493 ci = ceph_inode(req->r_target_inode);
1494 errseq_set(&ci->i_meta_err, -EIO);
1495 }
1496 if (req->r_unsafe_dir) {
1497
1498 ci = ceph_inode(req->r_unsafe_dir);
1499 errseq_set(&ci->i_meta_err, -EIO);
1500 }
1501 __unregister_request(mdsc, req);
1502 }
1503
1504 p = rb_first(&mdsc->request_tree);
1505 while (p) {
1506 req = rb_entry(p, struct ceph_mds_request, r_node);
1507 p = rb_next(p);
1508 if (req->r_session &&
1509 req->r_session->s_mds == session->s_mds)
1510 req->r_attempts = 0;
1511 }
1512 mutex_unlock(&mdsc->mutex);
1513}
1514
1515
1516
1517
1518
1519
1520
1521int ceph_iterate_session_caps(struct ceph_mds_session *session,
1522 int (*cb)(struct inode *, struct ceph_cap *,
1523 void *), void *arg)
1524{
1525 struct list_head *p;
1526 struct ceph_cap *cap;
1527 struct inode *inode, *last_inode = NULL;
1528 struct ceph_cap *old_cap = NULL;
1529 int ret;
1530
1531 dout("iterate_session_caps %p mds%d\n", session, session->s_mds);
1532 spin_lock(&session->s_cap_lock);
1533 p = session->s_caps.next;
1534 while (p != &session->s_caps) {
1535 cap = list_entry(p, struct ceph_cap, session_caps);
1536 inode = igrab(&cap->ci->vfs_inode);
1537 if (!inode) {
1538 p = p->next;
1539 continue;
1540 }
1541 session->s_cap_iterator = cap;
1542 spin_unlock(&session->s_cap_lock);
1543
1544 if (last_inode) {
1545 iput(last_inode);
1546 last_inode = NULL;
1547 }
1548 if (old_cap) {
1549 ceph_put_cap(session->s_mdsc, old_cap);
1550 old_cap = NULL;
1551 }
1552
1553 ret = cb(inode, cap, arg);
1554 last_inode = inode;
1555
1556 spin_lock(&session->s_cap_lock);
1557 p = p->next;
1558 if (!cap->ci) {
1559 dout("iterate_session_caps finishing cap %p removal\n",
1560 cap);
1561 BUG_ON(cap->session != session);
1562 cap->session = NULL;
1563 list_del_init(&cap->session_caps);
1564 session->s_nr_caps--;
1565 atomic64_dec(&session->s_mdsc->metric.total_caps);
1566 if (cap->queue_release)
1567 __ceph_queue_cap_release(session, cap);
1568 else
1569 old_cap = cap;
1570 }
1571 if (ret < 0)
1572 goto out;
1573 }
1574 ret = 0;
1575out:
1576 session->s_cap_iterator = NULL;
1577 spin_unlock(&session->s_cap_lock);
1578
1579 iput(last_inode);
1580 if (old_cap)
1581 ceph_put_cap(session->s_mdsc, old_cap);
1582
1583 return ret;
1584}
1585
1586static int remove_session_caps_cb(struct inode *inode, struct ceph_cap *cap,
1587 void *arg)
1588{
1589 struct ceph_fs_client *fsc = (struct ceph_fs_client *)arg;
1590 struct ceph_inode_info *ci = ceph_inode(inode);
1591 LIST_HEAD(to_remove);
1592 bool dirty_dropped = false;
1593 bool invalidate = false;
1594
1595 dout("removing cap %p, ci is %p, inode is %p\n",
1596 cap, ci, &ci->vfs_inode);
1597 spin_lock(&ci->i_ceph_lock);
1598 __ceph_remove_cap(cap, false);
1599 if (!ci->i_auth_cap) {
1600 struct ceph_cap_flush *cf;
1601 struct ceph_mds_client *mdsc = fsc->mdsc;
1602
1603 if (READ_ONCE(fsc->mount_state) >= CEPH_MOUNT_SHUTDOWN) {
1604 if (inode->i_data.nrpages > 0)
1605 invalidate = true;
1606 if (ci->i_wrbuffer_ref > 0)
1607 mapping_set_error(&inode->i_data, -EIO);
1608 }
1609
1610 while (!list_empty(&ci->i_cap_flush_list)) {
1611 cf = list_first_entry(&ci->i_cap_flush_list,
1612 struct ceph_cap_flush, i_list);
1613 list_move(&cf->i_list, &to_remove);
1614 }
1615
1616 spin_lock(&mdsc->cap_dirty_lock);
1617
1618 list_for_each_entry(cf, &to_remove, i_list)
1619 list_del_init(&cf->g_list);
1620
1621 if (!list_empty(&ci->i_dirty_item)) {
1622 pr_warn_ratelimited(
1623 " dropping dirty %s state for %p %lld\n",
1624 ceph_cap_string(ci->i_dirty_caps),
1625 inode, ceph_ino(inode));
1626 ci->i_dirty_caps = 0;
1627 list_del_init(&ci->i_dirty_item);
1628 dirty_dropped = true;
1629 }
1630 if (!list_empty(&ci->i_flushing_item)) {
1631 pr_warn_ratelimited(
1632 " dropping dirty+flushing %s state for %p %lld\n",
1633 ceph_cap_string(ci->i_flushing_caps),
1634 inode, ceph_ino(inode));
1635 ci->i_flushing_caps = 0;
1636 list_del_init(&ci->i_flushing_item);
1637 mdsc->num_cap_flushing--;
1638 dirty_dropped = true;
1639 }
1640 spin_unlock(&mdsc->cap_dirty_lock);
1641
1642 if (dirty_dropped) {
1643 errseq_set(&ci->i_meta_err, -EIO);
1644
1645 if (ci->i_wrbuffer_ref_head == 0 &&
1646 ci->i_wr_ref == 0 &&
1647 ci->i_dirty_caps == 0 &&
1648 ci->i_flushing_caps == 0) {
1649 ceph_put_snap_context(ci->i_head_snapc);
1650 ci->i_head_snapc = NULL;
1651 }
1652 }
1653
1654 if (atomic_read(&ci->i_filelock_ref) > 0) {
1655
1656 ci->i_ceph_flags |= CEPH_I_ERROR_FILELOCK;
1657 pr_warn_ratelimited(" dropping file locks for %p %lld\n",
1658 inode, ceph_ino(inode));
1659 }
1660
1661 if (!ci->i_dirty_caps && ci->i_prealloc_cap_flush) {
1662 list_add(&ci->i_prealloc_cap_flush->i_list, &to_remove);
1663 ci->i_prealloc_cap_flush = NULL;
1664 }
1665 }
1666 spin_unlock(&ci->i_ceph_lock);
1667 while (!list_empty(&to_remove)) {
1668 struct ceph_cap_flush *cf;
1669 cf = list_first_entry(&to_remove,
1670 struct ceph_cap_flush, i_list);
1671 list_del_init(&cf->i_list);
1672 if (!cf->is_capsnap)
1673 ceph_free_cap_flush(cf);
1674 }
1675
1676 wake_up_all(&ci->i_cap_wq);
1677 if (invalidate)
1678 ceph_queue_invalidate(inode);
1679 if (dirty_dropped)
1680 iput(inode);
1681 return 0;
1682}
1683
1684
1685
1686
1687static void remove_session_caps(struct ceph_mds_session *session)
1688{
1689 struct ceph_fs_client *fsc = session->s_mdsc->fsc;
1690 struct super_block *sb = fsc->sb;
1691 LIST_HEAD(dispose);
1692
1693 dout("remove_session_caps on %p\n", session);
1694 ceph_iterate_session_caps(session, remove_session_caps_cb, fsc);
1695
1696 wake_up_all(&fsc->mdsc->cap_flushing_wq);
1697
1698 spin_lock(&session->s_cap_lock);
1699 if (session->s_nr_caps > 0) {
1700 struct inode *inode;
1701 struct ceph_cap *cap, *prev = NULL;
1702 struct ceph_vino vino;
1703
1704
1705
1706
1707
1708
1709
1710 while (!list_empty(&session->s_caps)) {
1711 cap = list_entry(session->s_caps.next,
1712 struct ceph_cap, session_caps);
1713 if (cap == prev)
1714 break;
1715 prev = cap;
1716 vino = cap->ci->i_vino;
1717 spin_unlock(&session->s_cap_lock);
1718
1719 inode = ceph_find_inode(sb, vino);
1720 iput(inode);
1721
1722 spin_lock(&session->s_cap_lock);
1723 }
1724 }
1725
1726
1727 detach_cap_releases(session, &dispose);
1728
1729 BUG_ON(session->s_nr_caps > 0);
1730 BUG_ON(!list_empty(&session->s_cap_flushing));
1731 spin_unlock(&session->s_cap_lock);
1732 dispose_cap_releases(session->s_mdsc, &dispose);
1733}
1734
1735enum {
1736 RECONNECT,
1737 RENEWCAPS,
1738 FORCE_RO,
1739};
1740
1741
1742
1743
1744
1745
1746
1747static int wake_up_session_cb(struct inode *inode, struct ceph_cap *cap,
1748 void *arg)
1749{
1750 struct ceph_inode_info *ci = ceph_inode(inode);
1751 unsigned long ev = (unsigned long)arg;
1752
1753 if (ev == RECONNECT) {
1754 spin_lock(&ci->i_ceph_lock);
1755 ci->i_wanted_max_size = 0;
1756 ci->i_requested_max_size = 0;
1757 spin_unlock(&ci->i_ceph_lock);
1758 } else if (ev == RENEWCAPS) {
1759 if (cap->cap_gen < atomic_read(&cap->session->s_cap_gen)) {
1760
1761 spin_lock(&ci->i_ceph_lock);
1762 cap->issued = cap->implemented = CEPH_CAP_PIN;
1763 spin_unlock(&ci->i_ceph_lock);
1764 }
1765 } else if (ev == FORCE_RO) {
1766 }
1767 wake_up_all(&ci->i_cap_wq);
1768 return 0;
1769}
1770
1771static void wake_up_session_caps(struct ceph_mds_session *session, int ev)
1772{
1773 dout("wake_up_session_caps %p mds%d\n", session, session->s_mds);
1774 ceph_iterate_session_caps(session, wake_up_session_cb,
1775 (void *)(unsigned long)ev);
1776}
1777
1778
1779
1780
1781
1782
1783
1784static int send_renew_caps(struct ceph_mds_client *mdsc,
1785 struct ceph_mds_session *session)
1786{
1787 struct ceph_msg *msg;
1788 int state;
1789
1790 if (time_after_eq(jiffies, session->s_cap_ttl) &&
1791 time_after_eq(session->s_cap_ttl, session->s_renew_requested))
1792 pr_info("mds%d caps stale\n", session->s_mds);
1793 session->s_renew_requested = jiffies;
1794
1795
1796
1797 state = ceph_mdsmap_get_state(mdsc->mdsmap, session->s_mds);
1798 if (state < CEPH_MDS_STATE_RECONNECT) {
1799 dout("send_renew_caps ignoring mds%d (%s)\n",
1800 session->s_mds, ceph_mds_state_name(state));
1801 return 0;
1802 }
1803
1804 dout("send_renew_caps to mds%d (%s)\n", session->s_mds,
1805 ceph_mds_state_name(state));
1806 msg = create_session_msg(CEPH_SESSION_REQUEST_RENEWCAPS,
1807 ++session->s_renew_seq);
1808 if (!msg)
1809 return -ENOMEM;
1810 ceph_con_send(&session->s_con, msg);
1811 return 0;
1812}
1813
1814static int send_flushmsg_ack(struct ceph_mds_client *mdsc,
1815 struct ceph_mds_session *session, u64 seq)
1816{
1817 struct ceph_msg *msg;
1818
1819 dout("send_flushmsg_ack to mds%d (%s)s seq %lld\n",
1820 session->s_mds, ceph_session_state_name(session->s_state), seq);
1821 msg = create_session_msg(CEPH_SESSION_FLUSHMSG_ACK, seq);
1822 if (!msg)
1823 return -ENOMEM;
1824 ceph_con_send(&session->s_con, msg);
1825 return 0;
1826}
1827
1828
1829
1830
1831
1832
1833
1834static void renewed_caps(struct ceph_mds_client *mdsc,
1835 struct ceph_mds_session *session, int is_renew)
1836{
1837 int was_stale;
1838 int wake = 0;
1839
1840 spin_lock(&session->s_cap_lock);
1841 was_stale = is_renew && time_after_eq(jiffies, session->s_cap_ttl);
1842
1843 session->s_cap_ttl = session->s_renew_requested +
1844 mdsc->mdsmap->m_session_timeout*HZ;
1845
1846 if (was_stale) {
1847 if (time_before(jiffies, session->s_cap_ttl)) {
1848 pr_info("mds%d caps renewed\n", session->s_mds);
1849 wake = 1;
1850 } else {
1851 pr_info("mds%d caps still stale\n", session->s_mds);
1852 }
1853 }
1854 dout("renewed_caps mds%d ttl now %lu, was %s, now %s\n",
1855 session->s_mds, session->s_cap_ttl, was_stale ? "stale" : "fresh",
1856 time_before(jiffies, session->s_cap_ttl) ? "stale" : "fresh");
1857 spin_unlock(&session->s_cap_lock);
1858
1859 if (wake)
1860 wake_up_session_caps(session, RENEWCAPS);
1861}
1862
1863
1864
1865
1866static int request_close_session(struct ceph_mds_session *session)
1867{
1868 struct ceph_msg *msg;
1869
1870 dout("request_close_session mds%d state %s seq %lld\n",
1871 session->s_mds, ceph_session_state_name(session->s_state),
1872 session->s_seq);
1873 msg = create_session_msg(CEPH_SESSION_REQUEST_CLOSE, session->s_seq);
1874 if (!msg)
1875 return -ENOMEM;
1876 ceph_con_send(&session->s_con, msg);
1877 return 1;
1878}
1879
1880
1881
1882
1883static int __close_session(struct ceph_mds_client *mdsc,
1884 struct ceph_mds_session *session)
1885{
1886 if (session->s_state >= CEPH_MDS_SESSION_CLOSING)
1887 return 0;
1888 session->s_state = CEPH_MDS_SESSION_CLOSING;
1889 return request_close_session(session);
1890}
1891
1892static bool drop_negative_children(struct dentry *dentry)
1893{
1894 struct dentry *child;
1895 bool all_negative = true;
1896
1897 if (!d_is_dir(dentry))
1898 goto out;
1899
1900 spin_lock(&dentry->d_lock);
1901 list_for_each_entry(child, &dentry->d_subdirs, d_child) {
1902 if (d_really_is_positive(child)) {
1903 all_negative = false;
1904 break;
1905 }
1906 }
1907 spin_unlock(&dentry->d_lock);
1908
1909 if (all_negative)
1910 shrink_dcache_parent(dentry);
1911out:
1912 return all_negative;
1913}
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925static int trim_caps_cb(struct inode *inode, struct ceph_cap *cap, void *arg)
1926{
1927 int *remaining = arg;
1928 struct ceph_inode_info *ci = ceph_inode(inode);
1929 int used, wanted, oissued, mine;
1930
1931 if (*remaining <= 0)
1932 return -1;
1933
1934 spin_lock(&ci->i_ceph_lock);
1935 mine = cap->issued | cap->implemented;
1936 used = __ceph_caps_used(ci);
1937 wanted = __ceph_caps_file_wanted(ci);
1938 oissued = __ceph_caps_issued_other(ci, cap);
1939
1940 dout("trim_caps_cb %p cap %p mine %s oissued %s used %s wanted %s\n",
1941 inode, cap, ceph_cap_string(mine), ceph_cap_string(oissued),
1942 ceph_cap_string(used), ceph_cap_string(wanted));
1943 if (cap == ci->i_auth_cap) {
1944 if (ci->i_dirty_caps || ci->i_flushing_caps ||
1945 !list_empty(&ci->i_cap_snaps))
1946 goto out;
1947 if ((used | wanted) & CEPH_CAP_ANY_WR)
1948 goto out;
1949
1950
1951
1952 if (atomic_read(&ci->i_filelock_ref) > 0)
1953 goto out;
1954 }
1955
1956
1957 if (S_ISREG(inode->i_mode) &&
1958 wanted == 0 && used == CEPH_CAP_FILE_CACHE &&
1959 !(oissued & CEPH_CAP_FILE_CACHE)) {
1960 used = 0;
1961 oissued = 0;
1962 }
1963 if ((used | wanted) & ~oissued & mine)
1964 goto out;
1965
1966 if (oissued) {
1967
1968 __ceph_remove_cap(cap, true);
1969 (*remaining)--;
1970 } else {
1971 struct dentry *dentry;
1972
1973 spin_unlock(&ci->i_ceph_lock);
1974 dentry = d_find_any_alias(inode);
1975 if (dentry && drop_negative_children(dentry)) {
1976 int count;
1977 dput(dentry);
1978 d_prune_aliases(inode);
1979 count = atomic_read(&inode->i_count);
1980 if (count == 1)
1981 (*remaining)--;
1982 dout("trim_caps_cb %p cap %p pruned, count now %d\n",
1983 inode, cap, count);
1984 } else {
1985 dput(dentry);
1986 }
1987 return 0;
1988 }
1989
1990out:
1991 spin_unlock(&ci->i_ceph_lock);
1992 return 0;
1993}
1994
1995
1996
1997
1998int ceph_trim_caps(struct ceph_mds_client *mdsc,
1999 struct ceph_mds_session *session,
2000 int max_caps)
2001{
2002 int trim_caps = session->s_nr_caps - max_caps;
2003
2004 dout("trim_caps mds%d start: %d / %d, trim %d\n",
2005 session->s_mds, session->s_nr_caps, max_caps, trim_caps);
2006 if (trim_caps > 0) {
2007 int remaining = trim_caps;
2008
2009 ceph_iterate_session_caps(session, trim_caps_cb, &remaining);
2010 dout("trim_caps mds%d done: %d / %d, trimmed %d\n",
2011 session->s_mds, session->s_nr_caps, max_caps,
2012 trim_caps - remaining);
2013 }
2014
2015 ceph_flush_cap_releases(mdsc, session);
2016 return 0;
2017}
2018
2019static int check_caps_flush(struct ceph_mds_client *mdsc,
2020 u64 want_flush_tid)
2021{
2022 int ret = 1;
2023
2024 spin_lock(&mdsc->cap_dirty_lock);
2025 if (!list_empty(&mdsc->cap_flush_list)) {
2026 struct ceph_cap_flush *cf =
2027 list_first_entry(&mdsc->cap_flush_list,
2028 struct ceph_cap_flush, g_list);
2029 if (cf->tid <= want_flush_tid) {
2030 dout("check_caps_flush still flushing tid "
2031 "%llu <= %llu\n", cf->tid, want_flush_tid);
2032 ret = 0;
2033 }
2034 }
2035 spin_unlock(&mdsc->cap_dirty_lock);
2036 return ret;
2037}
2038
2039
2040
2041
2042
2043
2044static void wait_caps_flush(struct ceph_mds_client *mdsc,
2045 u64 want_flush_tid)
2046{
2047 dout("check_caps_flush want %llu\n", want_flush_tid);
2048
2049 wait_event(mdsc->cap_flushing_wq,
2050 check_caps_flush(mdsc, want_flush_tid));
2051
2052 dout("check_caps_flush ok, flushed thru %llu\n", want_flush_tid);
2053}
2054
2055
2056
2057
2058static void ceph_send_cap_releases(struct ceph_mds_client *mdsc,
2059 struct ceph_mds_session *session)
2060{
2061 struct ceph_msg *msg = NULL;
2062 struct ceph_mds_cap_release *head;
2063 struct ceph_mds_cap_item *item;
2064 struct ceph_osd_client *osdc = &mdsc->fsc->client->osdc;
2065 struct ceph_cap *cap;
2066 LIST_HEAD(tmp_list);
2067 int num_cap_releases;
2068 __le32 barrier, *cap_barrier;
2069
2070 down_read(&osdc->lock);
2071 barrier = cpu_to_le32(osdc->epoch_barrier);
2072 up_read(&osdc->lock);
2073
2074 spin_lock(&session->s_cap_lock);
2075again:
2076 list_splice_init(&session->s_cap_releases, &tmp_list);
2077 num_cap_releases = session->s_num_cap_releases;
2078 session->s_num_cap_releases = 0;
2079 spin_unlock(&session->s_cap_lock);
2080
2081 while (!list_empty(&tmp_list)) {
2082 if (!msg) {
2083 msg = ceph_msg_new(CEPH_MSG_CLIENT_CAPRELEASE,
2084 PAGE_SIZE, GFP_NOFS, false);
2085 if (!msg)
2086 goto out_err;
2087 head = msg->front.iov_base;
2088 head->num = cpu_to_le32(0);
2089 msg->front.iov_len = sizeof(*head);
2090
2091 msg->hdr.version = cpu_to_le16(2);
2092 msg->hdr.compat_version = cpu_to_le16(1);
2093 }
2094
2095 cap = list_first_entry(&tmp_list, struct ceph_cap,
2096 session_caps);
2097 list_del(&cap->session_caps);
2098 num_cap_releases--;
2099
2100 head = msg->front.iov_base;
2101 put_unaligned_le32(get_unaligned_le32(&head->num) + 1,
2102 &head->num);
2103 item = msg->front.iov_base + msg->front.iov_len;
2104 item->ino = cpu_to_le64(cap->cap_ino);
2105 item->cap_id = cpu_to_le64(cap->cap_id);
2106 item->migrate_seq = cpu_to_le32(cap->mseq);
2107 item->seq = cpu_to_le32(cap->issue_seq);
2108 msg->front.iov_len += sizeof(*item);
2109
2110 ceph_put_cap(mdsc, cap);
2111
2112 if (le32_to_cpu(head->num) == CEPH_CAPS_PER_RELEASE) {
2113
2114 cap_barrier = msg->front.iov_base + msg->front.iov_len;
2115 *cap_barrier = barrier;
2116 msg->front.iov_len += sizeof(*cap_barrier);
2117
2118 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
2119 dout("send_cap_releases mds%d %p\n", session->s_mds, msg);
2120 ceph_con_send(&session->s_con, msg);
2121 msg = NULL;
2122 }
2123 }
2124
2125 BUG_ON(num_cap_releases != 0);
2126
2127 spin_lock(&session->s_cap_lock);
2128 if (!list_empty(&session->s_cap_releases))
2129 goto again;
2130 spin_unlock(&session->s_cap_lock);
2131
2132 if (msg) {
2133
2134 cap_barrier = msg->front.iov_base + msg->front.iov_len;
2135 *cap_barrier = barrier;
2136 msg->front.iov_len += sizeof(*cap_barrier);
2137
2138 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
2139 dout("send_cap_releases mds%d %p\n", session->s_mds, msg);
2140 ceph_con_send(&session->s_con, msg);
2141 }
2142 return;
2143out_err:
2144 pr_err("send_cap_releases mds%d, failed to allocate message\n",
2145 session->s_mds);
2146 spin_lock(&session->s_cap_lock);
2147 list_splice(&tmp_list, &session->s_cap_releases);
2148 session->s_num_cap_releases += num_cap_releases;
2149 spin_unlock(&session->s_cap_lock);
2150}
2151
2152static void ceph_cap_release_work(struct work_struct *work)
2153{
2154 struct ceph_mds_session *session =
2155 container_of(work, struct ceph_mds_session, s_cap_release_work);
2156
2157 mutex_lock(&session->s_mutex);
2158 if (session->s_state == CEPH_MDS_SESSION_OPEN ||
2159 session->s_state == CEPH_MDS_SESSION_HUNG)
2160 ceph_send_cap_releases(session->s_mdsc, session);
2161 mutex_unlock(&session->s_mutex);
2162 ceph_put_mds_session(session);
2163}
2164
2165void ceph_flush_cap_releases(struct ceph_mds_client *mdsc,
2166 struct ceph_mds_session *session)
2167{
2168 if (mdsc->stopping)
2169 return;
2170
2171 ceph_get_mds_session(session);
2172 if (queue_work(mdsc->fsc->cap_wq,
2173 &session->s_cap_release_work)) {
2174 dout("cap release work queued\n");
2175 } else {
2176 ceph_put_mds_session(session);
2177 dout("failed to queue cap release work\n");
2178 }
2179}
2180
2181
2182
2183
2184void __ceph_queue_cap_release(struct ceph_mds_session *session,
2185 struct ceph_cap *cap)
2186{
2187 list_add_tail(&cap->session_caps, &session->s_cap_releases);
2188 session->s_num_cap_releases++;
2189
2190 if (!(session->s_num_cap_releases % CEPH_CAPS_PER_RELEASE))
2191 ceph_flush_cap_releases(session->s_mdsc, session);
2192}
2193
2194static void ceph_cap_reclaim_work(struct work_struct *work)
2195{
2196 struct ceph_mds_client *mdsc =
2197 container_of(work, struct ceph_mds_client, cap_reclaim_work);
2198 int ret = ceph_trim_dentries(mdsc);
2199 if (ret == -EAGAIN)
2200 ceph_queue_cap_reclaim_work(mdsc);
2201}
2202
2203void ceph_queue_cap_reclaim_work(struct ceph_mds_client *mdsc)
2204{
2205 if (mdsc->stopping)
2206 return;
2207
2208 if (queue_work(mdsc->fsc->cap_wq, &mdsc->cap_reclaim_work)) {
2209 dout("caps reclaim work queued\n");
2210 } else {
2211 dout("failed to queue caps release work\n");
2212 }
2213}
2214
2215void ceph_reclaim_caps_nr(struct ceph_mds_client *mdsc, int nr)
2216{
2217 int val;
2218 if (!nr)
2219 return;
2220 val = atomic_add_return(nr, &mdsc->cap_reclaim_pending);
2221 if ((val % CEPH_CAPS_PER_RELEASE) < nr) {
2222 atomic_set(&mdsc->cap_reclaim_pending, 0);
2223 ceph_queue_cap_reclaim_work(mdsc);
2224 }
2225}
2226
2227
2228
2229
2230
2231int ceph_alloc_readdir_reply_buffer(struct ceph_mds_request *req,
2232 struct inode *dir)
2233{
2234 struct ceph_inode_info *ci = ceph_inode(dir);
2235 struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
2236 struct ceph_mount_options *opt = req->r_mdsc->fsc->mount_options;
2237 size_t size = sizeof(struct ceph_mds_reply_dir_entry);
2238 unsigned int num_entries;
2239 int order;
2240
2241 spin_lock(&ci->i_ceph_lock);
2242 num_entries = ci->i_files + ci->i_subdirs;
2243 spin_unlock(&ci->i_ceph_lock);
2244 num_entries = max(num_entries, 1U);
2245 num_entries = min(num_entries, opt->max_readdir);
2246
2247 order = get_order(size * num_entries);
2248 while (order >= 0) {
2249 rinfo->dir_entries = (void*)__get_free_pages(GFP_KERNEL |
2250 __GFP_NOWARN,
2251 order);
2252 if (rinfo->dir_entries)
2253 break;
2254 order--;
2255 }
2256 if (!rinfo->dir_entries)
2257 return -ENOMEM;
2258
2259 num_entries = (PAGE_SIZE << order) / size;
2260 num_entries = min(num_entries, opt->max_readdir);
2261
2262 rinfo->dir_buf_size = PAGE_SIZE << order;
2263 req->r_num_caps = num_entries + 1;
2264 req->r_args.readdir.max_entries = cpu_to_le32(num_entries);
2265 req->r_args.readdir.max_bytes = cpu_to_le32(opt->max_readdir_bytes);
2266 return 0;
2267}
2268
2269
2270
2271
2272struct ceph_mds_request *
2273ceph_mdsc_create_request(struct ceph_mds_client *mdsc, int op, int mode)
2274{
2275 struct ceph_mds_request *req;
2276
2277 req = kmem_cache_zalloc(ceph_mds_request_cachep, GFP_NOFS);
2278 if (!req)
2279 return ERR_PTR(-ENOMEM);
2280
2281 mutex_init(&req->r_fill_mutex);
2282 req->r_mdsc = mdsc;
2283 req->r_started = jiffies;
2284 req->r_start_latency = ktime_get();
2285 req->r_resend_mds = -1;
2286 INIT_LIST_HEAD(&req->r_unsafe_dir_item);
2287 INIT_LIST_HEAD(&req->r_unsafe_target_item);
2288 req->r_fmode = -1;
2289 kref_init(&req->r_kref);
2290 RB_CLEAR_NODE(&req->r_node);
2291 INIT_LIST_HEAD(&req->r_wait);
2292 init_completion(&req->r_completion);
2293 init_completion(&req->r_safe_completion);
2294 INIT_LIST_HEAD(&req->r_unsafe_item);
2295
2296 ktime_get_coarse_real_ts64(&req->r_stamp);
2297
2298 req->r_op = op;
2299 req->r_direct_mode = mode;
2300 return req;
2301}
2302
2303
2304
2305
2306
2307
2308static struct ceph_mds_request *__get_oldest_req(struct ceph_mds_client *mdsc)
2309{
2310 if (RB_EMPTY_ROOT(&mdsc->request_tree))
2311 return NULL;
2312 return rb_entry(rb_first(&mdsc->request_tree),
2313 struct ceph_mds_request, r_node);
2314}
2315
2316static inline u64 __get_oldest_tid(struct ceph_mds_client *mdsc)
2317{
2318 return mdsc->oldest_tid;
2319}
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331char *ceph_mdsc_build_path(struct dentry *dentry, int *plen, u64 *pbase,
2332 int stop_on_nosnap)
2333{
2334 struct dentry *temp;
2335 char *path;
2336 int pos;
2337 unsigned seq;
2338 u64 base;
2339
2340 if (!dentry)
2341 return ERR_PTR(-EINVAL);
2342
2343 path = __getname();
2344 if (!path)
2345 return ERR_PTR(-ENOMEM);
2346retry:
2347 pos = PATH_MAX - 1;
2348 path[pos] = '\0';
2349
2350 seq = read_seqbegin(&rename_lock);
2351 rcu_read_lock();
2352 temp = dentry;
2353 for (;;) {
2354 struct inode *inode;
2355
2356 spin_lock(&temp->d_lock);
2357 inode = d_inode(temp);
2358 if (inode && ceph_snap(inode) == CEPH_SNAPDIR) {
2359 dout("build_path path+%d: %p SNAPDIR\n",
2360 pos, temp);
2361 } else if (stop_on_nosnap && inode && dentry != temp &&
2362 ceph_snap(inode) == CEPH_NOSNAP) {
2363 spin_unlock(&temp->d_lock);
2364 pos++;
2365 break;
2366 } else {
2367 pos -= temp->d_name.len;
2368 if (pos < 0) {
2369 spin_unlock(&temp->d_lock);
2370 break;
2371 }
2372 memcpy(path + pos, temp->d_name.name, temp->d_name.len);
2373 }
2374 spin_unlock(&temp->d_lock);
2375 temp = READ_ONCE(temp->d_parent);
2376
2377
2378 if (IS_ROOT(temp))
2379 break;
2380
2381
2382 if (--pos < 0)
2383 break;
2384
2385 path[pos] = '/';
2386 }
2387 base = ceph_ino(d_inode(temp));
2388 rcu_read_unlock();
2389
2390 if (read_seqretry(&rename_lock, seq))
2391 goto retry;
2392
2393 if (pos < 0) {
2394
2395
2396
2397
2398 pr_warn("build_path did not end path lookup where "
2399 "expected, pos is %d\n", pos);
2400 goto retry;
2401 }
2402
2403 *pbase = base;
2404 *plen = PATH_MAX - 1 - pos;
2405 dout("build_path on %p %d built %llx '%.*s'\n",
2406 dentry, d_count(dentry), base, *plen, path + pos);
2407 return path + pos;
2408}
2409
2410static int build_dentry_path(struct dentry *dentry, struct inode *dir,
2411 const char **ppath, int *ppathlen, u64 *pino,
2412 bool *pfreepath, bool parent_locked)
2413{
2414 char *path;
2415
2416 rcu_read_lock();
2417 if (!dir)
2418 dir = d_inode_rcu(dentry->d_parent);
2419 if (dir && parent_locked && ceph_snap(dir) == CEPH_NOSNAP) {
2420 *pino = ceph_ino(dir);
2421 rcu_read_unlock();
2422 *ppath = dentry->d_name.name;
2423 *ppathlen = dentry->d_name.len;
2424 return 0;
2425 }
2426 rcu_read_unlock();
2427 path = ceph_mdsc_build_path(dentry, ppathlen, pino, 1);
2428 if (IS_ERR(path))
2429 return PTR_ERR(path);
2430 *ppath = path;
2431 *pfreepath = true;
2432 return 0;
2433}
2434
2435static int build_inode_path(struct inode *inode,
2436 const char **ppath, int *ppathlen, u64 *pino,
2437 bool *pfreepath)
2438{
2439 struct dentry *dentry;
2440 char *path;
2441
2442 if (ceph_snap(inode) == CEPH_NOSNAP) {
2443 *pino = ceph_ino(inode);
2444 *ppathlen = 0;
2445 return 0;
2446 }
2447 dentry = d_find_alias(inode);
2448 path = ceph_mdsc_build_path(dentry, ppathlen, pino, 1);
2449 dput(dentry);
2450 if (IS_ERR(path))
2451 return PTR_ERR(path);
2452 *ppath = path;
2453 *pfreepath = true;
2454 return 0;
2455}
2456
2457
2458
2459
2460
2461static int set_request_path_attr(struct inode *rinode, struct dentry *rdentry,
2462 struct inode *rdiri, const char *rpath,
2463 u64 rino, const char **ppath, int *pathlen,
2464 u64 *ino, bool *freepath, bool parent_locked)
2465{
2466 int r = 0;
2467
2468 if (rinode) {
2469 r = build_inode_path(rinode, ppath, pathlen, ino, freepath);
2470 dout(" inode %p %llx.%llx\n", rinode, ceph_ino(rinode),
2471 ceph_snap(rinode));
2472 } else if (rdentry) {
2473 r = build_dentry_path(rdentry, rdiri, ppath, pathlen, ino,
2474 freepath, parent_locked);
2475 dout(" dentry %p %llx/%.*s\n", rdentry, *ino, *pathlen,
2476 *ppath);
2477 } else if (rpath || rino) {
2478 *ino = rino;
2479 *ppath = rpath;
2480 *pathlen = rpath ? strlen(rpath) : 0;
2481 dout(" path %.*s\n", *pathlen, rpath);
2482 }
2483
2484 return r;
2485}
2486
2487static void encode_timestamp_and_gids(void **p,
2488 const struct ceph_mds_request *req)
2489{
2490 struct ceph_timespec ts;
2491 int i;
2492
2493 ceph_encode_timespec64(&ts, &req->r_stamp);
2494 ceph_encode_copy(p, &ts, sizeof(ts));
2495
2496
2497 ceph_encode_32(p, req->r_cred->group_info->ngroups);
2498 for (i = 0; i < req->r_cred->group_info->ngroups; i++)
2499 ceph_encode_64(p, from_kgid(&init_user_ns,
2500 req->r_cred->group_info->gid[i]));
2501}
2502
2503
2504
2505
2506static struct ceph_msg *create_request_message(struct ceph_mds_session *session,
2507 struct ceph_mds_request *req,
2508 bool drop_cap_releases)
2509{
2510 int mds = session->s_mds;
2511 struct ceph_mds_client *mdsc = session->s_mdsc;
2512 struct ceph_msg *msg;
2513 struct ceph_mds_request_head_old *head;
2514 const char *path1 = NULL;
2515 const char *path2 = NULL;
2516 u64 ino1 = 0, ino2 = 0;
2517 int pathlen1 = 0, pathlen2 = 0;
2518 bool freepath1 = false, freepath2 = false;
2519 int len;
2520 u16 releases;
2521 void *p, *end;
2522 int ret;
2523 bool legacy = !(session->s_con.peer_features & CEPH_FEATURE_FS_BTIME);
2524
2525 ret = set_request_path_attr(req->r_inode, req->r_dentry,
2526 req->r_parent, req->r_path1, req->r_ino1.ino,
2527 &path1, &pathlen1, &ino1, &freepath1,
2528 test_bit(CEPH_MDS_R_PARENT_LOCKED,
2529 &req->r_req_flags));
2530 if (ret < 0) {
2531 msg = ERR_PTR(ret);
2532 goto out;
2533 }
2534
2535
2536 ret = set_request_path_attr(NULL, req->r_old_dentry,
2537 req->r_old_dentry_dir,
2538 req->r_path2, req->r_ino2.ino,
2539 &path2, &pathlen2, &ino2, &freepath2, true);
2540 if (ret < 0) {
2541 msg = ERR_PTR(ret);
2542 goto out_free1;
2543 }
2544
2545 len = legacy ? sizeof(*head) : sizeof(struct ceph_mds_request_head);
2546 len += pathlen1 + pathlen2 + 2*(1 + sizeof(u32) + sizeof(u64)) +
2547 sizeof(struct ceph_timespec);
2548 len += sizeof(u32) + (sizeof(u64) * req->r_cred->group_info->ngroups);
2549
2550
2551 len += sizeof(struct ceph_mds_request_release) *
2552 (!!req->r_inode_drop + !!req->r_dentry_drop +
2553 !!req->r_old_inode_drop + !!req->r_old_dentry_drop);
2554
2555 if (req->r_dentry_drop)
2556 len += pathlen1;
2557 if (req->r_old_dentry_drop)
2558 len += pathlen2;
2559
2560 msg = ceph_msg_new2(CEPH_MSG_CLIENT_REQUEST, len, 1, GFP_NOFS, false);
2561 if (!msg) {
2562 msg = ERR_PTR(-ENOMEM);
2563 goto out_free2;
2564 }
2565
2566 msg->hdr.tid = cpu_to_le64(req->r_tid);
2567
2568
2569
2570
2571
2572 if (legacy) {
2573 msg->hdr.version = cpu_to_le16(3);
2574 head = msg->front.iov_base;
2575 p = msg->front.iov_base + sizeof(*head);
2576 } else {
2577 struct ceph_mds_request_head *new_head = msg->front.iov_base;
2578
2579 msg->hdr.version = cpu_to_le16(4);
2580 new_head->version = cpu_to_le16(CEPH_MDS_REQUEST_HEAD_VERSION);
2581 head = (struct ceph_mds_request_head_old *)&new_head->oldest_client_tid;
2582 p = msg->front.iov_base + sizeof(*new_head);
2583 }
2584
2585 end = msg->front.iov_base + msg->front.iov_len;
2586
2587 head->mdsmap_epoch = cpu_to_le32(mdsc->mdsmap->m_epoch);
2588 head->op = cpu_to_le32(req->r_op);
2589 head->caller_uid = cpu_to_le32(from_kuid(&init_user_ns,
2590 req->r_cred->fsuid));
2591 head->caller_gid = cpu_to_le32(from_kgid(&init_user_ns,
2592 req->r_cred->fsgid));
2593 head->ino = cpu_to_le64(req->r_deleg_ino);
2594 head->args = req->r_args;
2595
2596 ceph_encode_filepath(&p, end, ino1, path1);
2597 ceph_encode_filepath(&p, end, ino2, path2);
2598
2599
2600 req->r_request_release_offset = p - msg->front.iov_base;
2601
2602
2603 releases = 0;
2604 if (req->r_inode_drop)
2605 releases += ceph_encode_inode_release(&p,
2606 req->r_inode ? req->r_inode : d_inode(req->r_dentry),
2607 mds, req->r_inode_drop, req->r_inode_unless,
2608 req->r_op == CEPH_MDS_OP_READDIR);
2609 if (req->r_dentry_drop)
2610 releases += ceph_encode_dentry_release(&p, req->r_dentry,
2611 req->r_parent, mds, req->r_dentry_drop,
2612 req->r_dentry_unless);
2613 if (req->r_old_dentry_drop)
2614 releases += ceph_encode_dentry_release(&p, req->r_old_dentry,
2615 req->r_old_dentry_dir, mds,
2616 req->r_old_dentry_drop,
2617 req->r_old_dentry_unless);
2618 if (req->r_old_inode_drop)
2619 releases += ceph_encode_inode_release(&p,
2620 d_inode(req->r_old_dentry),
2621 mds, req->r_old_inode_drop, req->r_old_inode_unless, 0);
2622
2623 if (drop_cap_releases) {
2624 releases = 0;
2625 p = msg->front.iov_base + req->r_request_release_offset;
2626 }
2627
2628 head->num_releases = cpu_to_le16(releases);
2629
2630 encode_timestamp_and_gids(&p, req);
2631
2632 if (WARN_ON_ONCE(p > end)) {
2633 ceph_msg_put(msg);
2634 msg = ERR_PTR(-ERANGE);
2635 goto out_free2;
2636 }
2637
2638 msg->front.iov_len = p - msg->front.iov_base;
2639 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
2640
2641 if (req->r_pagelist) {
2642 struct ceph_pagelist *pagelist = req->r_pagelist;
2643 ceph_msg_data_add_pagelist(msg, pagelist);
2644 msg->hdr.data_len = cpu_to_le32(pagelist->length);
2645 } else {
2646 msg->hdr.data_len = 0;
2647 }
2648
2649 msg->hdr.data_off = cpu_to_le16(0);
2650
2651out_free2:
2652 if (freepath2)
2653 ceph_mdsc_free_path((char *)path2, pathlen2);
2654out_free1:
2655 if (freepath1)
2656 ceph_mdsc_free_path((char *)path1, pathlen1);
2657out:
2658 return msg;
2659}
2660
2661
2662
2663
2664
2665static void complete_request(struct ceph_mds_client *mdsc,
2666 struct ceph_mds_request *req)
2667{
2668 req->r_end_latency = ktime_get();
2669
2670 if (req->r_callback)
2671 req->r_callback(mdsc, req);
2672 complete_all(&req->r_completion);
2673}
2674
2675static struct ceph_mds_request_head_old *
2676find_old_request_head(void *p, u64 features)
2677{
2678 bool legacy = !(features & CEPH_FEATURE_FS_BTIME);
2679 struct ceph_mds_request_head *new_head;
2680
2681 if (legacy)
2682 return (struct ceph_mds_request_head_old *)p;
2683 new_head = (struct ceph_mds_request_head *)p;
2684 return (struct ceph_mds_request_head_old *)&new_head->oldest_client_tid;
2685}
2686
2687
2688
2689
2690static int __prepare_send_request(struct ceph_mds_session *session,
2691 struct ceph_mds_request *req,
2692 bool drop_cap_releases)
2693{
2694 int mds = session->s_mds;
2695 struct ceph_mds_client *mdsc = session->s_mdsc;
2696 struct ceph_mds_request_head_old *rhead;
2697 struct ceph_msg *msg;
2698 int flags = 0;
2699
2700 req->r_attempts++;
2701 if (req->r_inode) {
2702 struct ceph_cap *cap =
2703 ceph_get_cap_for_mds(ceph_inode(req->r_inode), mds);
2704
2705 if (cap)
2706 req->r_sent_on_mseq = cap->mseq;
2707 else
2708 req->r_sent_on_mseq = -1;
2709 }
2710 dout("prepare_send_request %p tid %lld %s (attempt %d)\n", req,
2711 req->r_tid, ceph_mds_op_name(req->r_op), req->r_attempts);
2712
2713 if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) {
2714 void *p;
2715
2716
2717
2718
2719
2720
2721
2722 msg = req->r_request;
2723 rhead = find_old_request_head(msg->front.iov_base,
2724 session->s_con.peer_features);
2725
2726 flags = le32_to_cpu(rhead->flags);
2727 flags |= CEPH_MDS_FLAG_REPLAY;
2728 rhead->flags = cpu_to_le32(flags);
2729
2730 if (req->r_target_inode)
2731 rhead->ino = cpu_to_le64(ceph_ino(req->r_target_inode));
2732
2733 rhead->num_retry = req->r_attempts - 1;
2734
2735
2736 rhead->num_releases = 0;
2737
2738 p = msg->front.iov_base + req->r_request_release_offset;
2739 encode_timestamp_and_gids(&p, req);
2740
2741 msg->front.iov_len = p - msg->front.iov_base;
2742 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
2743 return 0;
2744 }
2745
2746 if (req->r_request) {
2747 ceph_msg_put(req->r_request);
2748 req->r_request = NULL;
2749 }
2750 msg = create_request_message(session, req, drop_cap_releases);
2751 if (IS_ERR(msg)) {
2752 req->r_err = PTR_ERR(msg);
2753 return PTR_ERR(msg);
2754 }
2755 req->r_request = msg;
2756
2757 rhead = find_old_request_head(msg->front.iov_base,
2758 session->s_con.peer_features);
2759 rhead->oldest_client_tid = cpu_to_le64(__get_oldest_tid(mdsc));
2760 if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags))
2761 flags |= CEPH_MDS_FLAG_REPLAY;
2762 if (test_bit(CEPH_MDS_R_ASYNC, &req->r_req_flags))
2763 flags |= CEPH_MDS_FLAG_ASYNC;
2764 if (req->r_parent)
2765 flags |= CEPH_MDS_FLAG_WANT_DENTRY;
2766 rhead->flags = cpu_to_le32(flags);
2767 rhead->num_fwd = req->r_num_fwd;
2768 rhead->num_retry = req->r_attempts - 1;
2769
2770 dout(" r_parent = %p\n", req->r_parent);
2771 return 0;
2772}
2773
2774
2775
2776
2777static int __send_request(struct ceph_mds_session *session,
2778 struct ceph_mds_request *req,
2779 bool drop_cap_releases)
2780{
2781 int err;
2782
2783 err = __prepare_send_request(session, req, drop_cap_releases);
2784 if (!err) {
2785 ceph_msg_get(req->r_request);
2786 ceph_con_send(&session->s_con, req->r_request);
2787 }
2788
2789 return err;
2790}
2791
2792
2793
2794
2795static void __do_request(struct ceph_mds_client *mdsc,
2796 struct ceph_mds_request *req)
2797{
2798 struct ceph_mds_session *session = NULL;
2799 int mds = -1;
2800 int err = 0;
2801 bool random;
2802
2803 if (req->r_err || test_bit(CEPH_MDS_R_GOT_RESULT, &req->r_req_flags)) {
2804 if (test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags))
2805 __unregister_request(mdsc, req);
2806 return;
2807 }
2808
2809 if (req->r_timeout &&
2810 time_after_eq(jiffies, req->r_started + req->r_timeout)) {
2811 dout("do_request timed out\n");
2812 err = -ETIMEDOUT;
2813 goto finish;
2814 }
2815 if (READ_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_SHUTDOWN) {
2816 dout("do_request forced umount\n");
2817 err = -EIO;
2818 goto finish;
2819 }
2820 if (READ_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_MOUNTING) {
2821 if (mdsc->mdsmap_err) {
2822 err = mdsc->mdsmap_err;
2823 dout("do_request mdsmap err %d\n", err);
2824 goto finish;
2825 }
2826 if (mdsc->mdsmap->m_epoch == 0) {
2827 dout("do_request no mdsmap, waiting for map\n");
2828 list_add(&req->r_wait, &mdsc->waiting_for_map);
2829 return;
2830 }
2831 if (!(mdsc->fsc->mount_options->flags &
2832 CEPH_MOUNT_OPT_MOUNTWAIT) &&
2833 !ceph_mdsmap_is_cluster_available(mdsc->mdsmap)) {
2834 err = -EHOSTUNREACH;
2835 goto finish;
2836 }
2837 }
2838
2839 put_request_session(req);
2840
2841 mds = __choose_mds(mdsc, req, &random);
2842 if (mds < 0 ||
2843 ceph_mdsmap_get_state(mdsc->mdsmap, mds) < CEPH_MDS_STATE_ACTIVE) {
2844 if (test_bit(CEPH_MDS_R_ASYNC, &req->r_req_flags)) {
2845 err = -EJUKEBOX;
2846 goto finish;
2847 }
2848 dout("do_request no mds or not active, waiting for map\n");
2849 list_add(&req->r_wait, &mdsc->waiting_for_map);
2850 return;
2851 }
2852
2853
2854 session = __ceph_lookup_mds_session(mdsc, mds);
2855 if (!session) {
2856 session = register_session(mdsc, mds);
2857 if (IS_ERR(session)) {
2858 err = PTR_ERR(session);
2859 goto finish;
2860 }
2861 }
2862 req->r_session = ceph_get_mds_session(session);
2863
2864 dout("do_request mds%d session %p state %s\n", mds, session,
2865 ceph_session_state_name(session->s_state));
2866 if (session->s_state != CEPH_MDS_SESSION_OPEN &&
2867 session->s_state != CEPH_MDS_SESSION_HUNG) {
2868
2869
2870
2871
2872
2873 if (test_bit(CEPH_MDS_R_ASYNC, &req->r_req_flags)) {
2874 err = -EJUKEBOX;
2875 goto out_session;
2876 }
2877
2878
2879
2880
2881
2882
2883 if (session->s_state == CEPH_MDS_SESSION_REJECTED) {
2884 if (ceph_test_mount_opt(mdsc->fsc, CLEANRECOVER))
2885 list_add(&req->r_wait, &mdsc->waiting_for_map);
2886 else
2887 err = -EACCES;
2888 goto out_session;
2889 }
2890
2891 if (session->s_state == CEPH_MDS_SESSION_NEW ||
2892 session->s_state == CEPH_MDS_SESSION_CLOSING) {
2893 err = __open_session(mdsc, session);
2894 if (err)
2895 goto out_session;
2896
2897 if (random)
2898 req->r_resend_mds = mds;
2899 }
2900 list_add(&req->r_wait, &session->s_waiting);
2901 goto out_session;
2902 }
2903
2904
2905 req->r_resend_mds = -1;
2906
2907 if (req->r_request_started == 0)
2908 req->r_request_started = jiffies;
2909
2910 err = __send_request(session, req, false);
2911
2912out_session:
2913 ceph_put_mds_session(session);
2914finish:
2915 if (err) {
2916 dout("__do_request early error %d\n", err);
2917 req->r_err = err;
2918 complete_request(mdsc, req);
2919 __unregister_request(mdsc, req);
2920 }
2921 return;
2922}
2923
2924
2925
2926
2927static void __wake_requests(struct ceph_mds_client *mdsc,
2928 struct list_head *head)
2929{
2930 struct ceph_mds_request *req;
2931 LIST_HEAD(tmp_list);
2932
2933 list_splice_init(head, &tmp_list);
2934
2935 while (!list_empty(&tmp_list)) {
2936 req = list_entry(tmp_list.next,
2937 struct ceph_mds_request, r_wait);
2938 list_del_init(&req->r_wait);
2939 dout(" wake request %p tid %llu\n", req, req->r_tid);
2940 __do_request(mdsc, req);
2941 }
2942}
2943
2944
2945
2946
2947
2948static void kick_requests(struct ceph_mds_client *mdsc, int mds)
2949{
2950 struct ceph_mds_request *req;
2951 struct rb_node *p = rb_first(&mdsc->request_tree);
2952
2953 dout("kick_requests mds%d\n", mds);
2954 while (p) {
2955 req = rb_entry(p, struct ceph_mds_request, r_node);
2956 p = rb_next(p);
2957 if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags))
2958 continue;
2959 if (req->r_attempts > 0)
2960 continue;
2961 if (req->r_session &&
2962 req->r_session->s_mds == mds) {
2963 dout(" kicking tid %llu\n", req->r_tid);
2964 list_del_init(&req->r_wait);
2965 __do_request(mdsc, req);
2966 }
2967 }
2968}
2969
2970int ceph_mdsc_submit_request(struct ceph_mds_client *mdsc, struct inode *dir,
2971 struct ceph_mds_request *req)
2972{
2973 int err = 0;
2974
2975
2976 if (req->r_inode)
2977 ceph_get_cap_refs(ceph_inode(req->r_inode), CEPH_CAP_PIN);
2978 if (req->r_parent) {
2979 struct ceph_inode_info *ci = ceph_inode(req->r_parent);
2980 int fmode = (req->r_op & CEPH_MDS_OP_WRITE) ?
2981 CEPH_FILE_MODE_WR : CEPH_FILE_MODE_RD;
2982 spin_lock(&ci->i_ceph_lock);
2983 ceph_take_cap_refs(ci, CEPH_CAP_PIN, false);
2984 __ceph_touch_fmode(ci, mdsc, fmode);
2985 spin_unlock(&ci->i_ceph_lock);
2986 }
2987 if (req->r_old_dentry_dir)
2988 ceph_get_cap_refs(ceph_inode(req->r_old_dentry_dir),
2989 CEPH_CAP_PIN);
2990
2991 if (req->r_inode) {
2992 err = ceph_wait_on_async_create(req->r_inode);
2993 if (err) {
2994 dout("%s: wait for async create returned: %d\n",
2995 __func__, err);
2996 return err;
2997 }
2998 }
2999
3000 if (!err && req->r_old_inode) {
3001 err = ceph_wait_on_async_create(req->r_old_inode);
3002 if (err) {
3003 dout("%s: wait for async create returned: %d\n",
3004 __func__, err);
3005 return err;
3006 }
3007 }
3008
3009 dout("submit_request on %p for inode %p\n", req, dir);
3010 mutex_lock(&mdsc->mutex);
3011 __register_request(mdsc, req, dir);
3012 __do_request(mdsc, req);
3013 err = req->r_err;
3014 mutex_unlock(&mdsc->mutex);
3015 return err;
3016}
3017
3018static int ceph_mdsc_wait_request(struct ceph_mds_client *mdsc,
3019 struct ceph_mds_request *req)
3020{
3021 int err;
3022
3023
3024 dout("do_request waiting\n");
3025 if (!req->r_timeout && req->r_wait_for_completion) {
3026 err = req->r_wait_for_completion(mdsc, req);
3027 } else {
3028 long timeleft = wait_for_completion_killable_timeout(
3029 &req->r_completion,
3030 ceph_timeout_jiffies(req->r_timeout));
3031 if (timeleft > 0)
3032 err = 0;
3033 else if (!timeleft)
3034 err = -ETIMEDOUT;
3035 else
3036 err = timeleft;
3037 }
3038 dout("do_request waited, got %d\n", err);
3039 mutex_lock(&mdsc->mutex);
3040
3041
3042 if (test_bit(CEPH_MDS_R_GOT_RESULT, &req->r_req_flags)) {
3043 err = le32_to_cpu(req->r_reply_info.head->result);
3044 } else if (err < 0) {
3045 dout("aborted request %lld with %d\n", req->r_tid, err);
3046
3047
3048
3049
3050
3051
3052 mutex_lock(&req->r_fill_mutex);
3053 req->r_err = err;
3054 set_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags);
3055 mutex_unlock(&req->r_fill_mutex);
3056
3057 if (req->r_parent &&
3058 (req->r_op & CEPH_MDS_OP_WRITE))
3059 ceph_invalidate_dir_request(req);
3060 } else {
3061 err = req->r_err;
3062 }
3063
3064 mutex_unlock(&mdsc->mutex);
3065 return err;
3066}
3067
3068
3069
3070
3071
3072int ceph_mdsc_do_request(struct ceph_mds_client *mdsc,
3073 struct inode *dir,
3074 struct ceph_mds_request *req)
3075{
3076 int err;
3077
3078 dout("do_request on %p\n", req);
3079
3080
3081 err = ceph_mdsc_submit_request(mdsc, dir, req);
3082 if (!err)
3083 err = ceph_mdsc_wait_request(mdsc, req);
3084 dout("do_request %p done, result %d\n", req, err);
3085 return err;
3086}
3087
3088
3089
3090
3091
3092void ceph_invalidate_dir_request(struct ceph_mds_request *req)
3093{
3094 struct inode *dir = req->r_parent;
3095 struct inode *old_dir = req->r_old_dentry_dir;
3096
3097 dout("invalidate_dir_request %p %p (complete, lease(s))\n", dir, old_dir);
3098
3099 ceph_dir_clear_complete(dir);
3100 if (old_dir)
3101 ceph_dir_clear_complete(old_dir);
3102 if (req->r_dentry)
3103 ceph_invalidate_dentry_lease(req->r_dentry);
3104 if (req->r_old_dentry)
3105 ceph_invalidate_dentry_lease(req->r_old_dentry);
3106}
3107
3108
3109
3110
3111
3112
3113
3114
3115static void handle_reply(struct ceph_mds_session *session, struct ceph_msg *msg)
3116{
3117 struct ceph_mds_client *mdsc = session->s_mdsc;
3118 struct ceph_mds_request *req;
3119 struct ceph_mds_reply_head *head = msg->front.iov_base;
3120 struct ceph_mds_reply_info_parsed *rinfo;
3121 struct ceph_snap_realm *realm;
3122 u64 tid;
3123 int err, result;
3124 int mds = session->s_mds;
3125
3126 if (msg->front.iov_len < sizeof(*head)) {
3127 pr_err("mdsc_handle_reply got corrupt (short) reply\n");
3128 ceph_msg_dump(msg);
3129 return;
3130 }
3131
3132
3133 tid = le64_to_cpu(msg->hdr.tid);
3134 mutex_lock(&mdsc->mutex);
3135 req = lookup_get_request(mdsc, tid);
3136 if (!req) {
3137 dout("handle_reply on unknown tid %llu\n", tid);
3138 mutex_unlock(&mdsc->mutex);
3139 return;
3140 }
3141 dout("handle_reply %p\n", req);
3142
3143
3144 if (req->r_session != session) {
3145 pr_err("mdsc_handle_reply got %llu on session mds%d"
3146 " not mds%d\n", tid, session->s_mds,
3147 req->r_session ? req->r_session->s_mds : -1);
3148 mutex_unlock(&mdsc->mutex);
3149 goto out;
3150 }
3151
3152
3153 if ((test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags) && !head->safe) ||
3154 (test_bit(CEPH_MDS_R_GOT_SAFE, &req->r_req_flags) && head->safe)) {
3155 pr_warn("got a dup %s reply on %llu from mds%d\n",
3156 head->safe ? "safe" : "unsafe", tid, mds);
3157 mutex_unlock(&mdsc->mutex);
3158 goto out;
3159 }
3160 if (test_bit(CEPH_MDS_R_GOT_SAFE, &req->r_req_flags)) {
3161 pr_warn("got unsafe after safe on %llu from mds%d\n",
3162 tid, mds);
3163 mutex_unlock(&mdsc->mutex);
3164 goto out;
3165 }
3166
3167 result = le32_to_cpu(head->result);
3168
3169
3170
3171
3172
3173
3174
3175
3176 if (result == -ESTALE) {
3177 dout("got ESTALE on request %llu\n", req->r_tid);
3178 req->r_resend_mds = -1;
3179 if (req->r_direct_mode != USE_AUTH_MDS) {
3180 dout("not using auth, setting for that now\n");
3181 req->r_direct_mode = USE_AUTH_MDS;
3182 __do_request(mdsc, req);
3183 mutex_unlock(&mdsc->mutex);
3184 goto out;
3185 } else {
3186 int mds = __choose_mds(mdsc, req, NULL);
3187 if (mds >= 0 && mds != req->r_session->s_mds) {
3188 dout("but auth changed, so resending\n");
3189 __do_request(mdsc, req);
3190 mutex_unlock(&mdsc->mutex);
3191 goto out;
3192 }
3193 }
3194 dout("have to return ESTALE on request %llu\n", req->r_tid);
3195 }
3196
3197
3198 if (head->safe) {
3199 set_bit(CEPH_MDS_R_GOT_SAFE, &req->r_req_flags);
3200 __unregister_request(mdsc, req);
3201
3202
3203 if (mdsc->stopping && !__get_oldest_req(mdsc))
3204 complete_all(&mdsc->safe_umount_waiters);
3205
3206 if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) {
3207
3208
3209
3210
3211
3212
3213
3214 dout("got safe reply %llu, mds%d\n", tid, mds);
3215
3216 mutex_unlock(&mdsc->mutex);
3217 goto out;
3218 }
3219 } else {
3220 set_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags);
3221 list_add_tail(&req->r_unsafe_item, &req->r_session->s_unsafe);
3222 }
3223
3224 dout("handle_reply tid %lld result %d\n", tid, result);
3225 rinfo = &req->r_reply_info;
3226 if (test_bit(CEPHFS_FEATURE_REPLY_ENCODING, &session->s_features))
3227 err = parse_reply_info(session, msg, rinfo, (u64)-1);
3228 else
3229 err = parse_reply_info(session, msg, rinfo, session->s_con.peer_features);
3230 mutex_unlock(&mdsc->mutex);
3231
3232
3233 if ((err >= 0) && rinfo->head->is_target) {
3234 struct inode *in;
3235 struct ceph_vino tvino = {
3236 .ino = le64_to_cpu(rinfo->targeti.in->ino),
3237 .snap = le64_to_cpu(rinfo->targeti.in->snapid)
3238 };
3239
3240 in = ceph_get_inode(mdsc->fsc->sb, tvino);
3241 if (IS_ERR(in)) {
3242 err = PTR_ERR(in);
3243 mutex_lock(&session->s_mutex);
3244 goto out_err;
3245 }
3246 req->r_target_inode = in;
3247 }
3248
3249 mutex_lock(&session->s_mutex);
3250 if (err < 0) {
3251 pr_err("mdsc_handle_reply got corrupt reply mds%d(tid:%lld)\n", mds, tid);
3252 ceph_msg_dump(msg);
3253 goto out_err;
3254 }
3255
3256
3257 realm = NULL;
3258 if (rinfo->snapblob_len) {
3259 down_write(&mdsc->snap_rwsem);
3260 ceph_update_snap_trace(mdsc, rinfo->snapblob,
3261 rinfo->snapblob + rinfo->snapblob_len,
3262 le32_to_cpu(head->op) == CEPH_MDS_OP_RMSNAP,
3263 &realm);
3264 downgrade_write(&mdsc->snap_rwsem);
3265 } else {
3266 down_read(&mdsc->snap_rwsem);
3267 }
3268
3269
3270 mutex_lock(&req->r_fill_mutex);
3271 current->journal_info = req;
3272 err = ceph_fill_trace(mdsc->fsc->sb, req);
3273 if (err == 0) {
3274 if (result == 0 && (req->r_op == CEPH_MDS_OP_READDIR ||
3275 req->r_op == CEPH_MDS_OP_LSSNAP))
3276 ceph_readdir_prepopulate(req, req->r_session);
3277 }
3278 current->journal_info = NULL;
3279 mutex_unlock(&req->r_fill_mutex);
3280
3281 up_read(&mdsc->snap_rwsem);
3282 if (realm)
3283 ceph_put_snap_realm(mdsc, realm);
3284
3285 if (err == 0) {
3286 if (req->r_target_inode &&
3287 test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) {
3288 struct ceph_inode_info *ci =
3289 ceph_inode(req->r_target_inode);
3290 spin_lock(&ci->i_unsafe_lock);
3291 list_add_tail(&req->r_unsafe_target_item,
3292 &ci->i_unsafe_iops);
3293 spin_unlock(&ci->i_unsafe_lock);
3294 }
3295
3296 ceph_unreserve_caps(mdsc, &req->r_caps_reservation);
3297 }
3298out_err:
3299 mutex_lock(&mdsc->mutex);
3300 if (!test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags)) {
3301 if (err) {
3302 req->r_err = err;
3303 } else {
3304 req->r_reply = ceph_msg_get(msg);
3305 set_bit(CEPH_MDS_R_GOT_RESULT, &req->r_req_flags);
3306 }
3307 } else {
3308 dout("reply arrived after request %lld was aborted\n", tid);
3309 }
3310 mutex_unlock(&mdsc->mutex);
3311
3312 mutex_unlock(&session->s_mutex);
3313
3314
3315 complete_request(mdsc, req);
3316
3317 ceph_update_metadata_metrics(&mdsc->metric, req->r_start_latency,
3318 req->r_end_latency, err);
3319out:
3320 ceph_mdsc_put_request(req);
3321 return;
3322}
3323
3324
3325
3326
3327
3328
3329static void handle_forward(struct ceph_mds_client *mdsc,
3330 struct ceph_mds_session *session,
3331 struct ceph_msg *msg)
3332{
3333 struct ceph_mds_request *req;
3334 u64 tid = le64_to_cpu(msg->hdr.tid);
3335 u32 next_mds;
3336 u32 fwd_seq;
3337 int err = -EINVAL;
3338 void *p = msg->front.iov_base;
3339 void *end = p + msg->front.iov_len;
3340
3341 ceph_decode_need(&p, end, 2*sizeof(u32), bad);
3342 next_mds = ceph_decode_32(&p);
3343 fwd_seq = ceph_decode_32(&p);
3344
3345 mutex_lock(&mdsc->mutex);
3346 req = lookup_get_request(mdsc, tid);
3347 if (!req) {
3348 dout("forward tid %llu to mds%d - req dne\n", tid, next_mds);
3349 goto out;
3350 }
3351
3352 if (test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags)) {
3353 dout("forward tid %llu aborted, unregistering\n", tid);
3354 __unregister_request(mdsc, req);
3355 } else if (fwd_seq <= req->r_num_fwd) {
3356 dout("forward tid %llu to mds%d - old seq %d <= %d\n",
3357 tid, next_mds, req->r_num_fwd, fwd_seq);
3358 } else {
3359
3360 dout("forward tid %llu to mds%d (we resend)\n", tid, next_mds);
3361 BUG_ON(req->r_err);
3362 BUG_ON(test_bit(CEPH_MDS_R_GOT_RESULT, &req->r_req_flags));
3363 req->r_attempts = 0;
3364 req->r_num_fwd = fwd_seq;
3365 req->r_resend_mds = next_mds;
3366 put_request_session(req);
3367 __do_request(mdsc, req);
3368 }
3369 ceph_mdsc_put_request(req);
3370out:
3371 mutex_unlock(&mdsc->mutex);
3372 return;
3373
3374bad:
3375 pr_err("mdsc_handle_forward decode error err=%d\n", err);
3376}
3377
3378static int __decode_session_metadata(void **p, void *end,
3379 bool *blocklisted)
3380{
3381
3382 u32 n;
3383 bool err_str;
3384 ceph_decode_32_safe(p, end, n, bad);
3385 while (n-- > 0) {
3386 u32 len;
3387 ceph_decode_32_safe(p, end, len, bad);
3388 ceph_decode_need(p, end, len, bad);
3389 err_str = !strncmp(*p, "error_string", len);
3390 *p += len;
3391 ceph_decode_32_safe(p, end, len, bad);
3392 ceph_decode_need(p, end, len, bad);
3393
3394
3395
3396
3397 if (err_str && strnstr(*p, "blacklisted", len))
3398 *blocklisted = true;
3399 *p += len;
3400 }
3401 return 0;
3402bad:
3403 return -1;
3404}
3405
3406
3407
3408
3409static void handle_session(struct ceph_mds_session *session,
3410 struct ceph_msg *msg)
3411{
3412 struct ceph_mds_client *mdsc = session->s_mdsc;
3413 int mds = session->s_mds;
3414 int msg_version = le16_to_cpu(msg->hdr.version);
3415 void *p = msg->front.iov_base;
3416 void *end = p + msg->front.iov_len;
3417 struct ceph_mds_session_head *h;
3418 u32 op;
3419 u64 seq, features = 0;
3420 int wake = 0;
3421 bool blocklisted = false;
3422
3423
3424 ceph_decode_need(&p, end, sizeof(*h), bad);
3425 h = p;
3426 p += sizeof(*h);
3427
3428 op = le32_to_cpu(h->op);
3429 seq = le64_to_cpu(h->seq);
3430
3431 if (msg_version >= 3) {
3432 u32 len;
3433
3434 if (__decode_session_metadata(&p, end, &blocklisted) < 0)
3435 goto bad;
3436
3437 ceph_decode_32_safe(&p, end, len, bad);
3438 if (len) {
3439 ceph_decode_64_safe(&p, end, features, bad);
3440 p += len - sizeof(features);
3441 }
3442 }
3443
3444 mutex_lock(&mdsc->mutex);
3445 if (op == CEPH_SESSION_CLOSE) {
3446 ceph_get_mds_session(session);
3447 __unregister_session(mdsc, session);
3448 }
3449
3450 session->s_ttl = jiffies + HZ*mdsc->mdsmap->m_session_autoclose;
3451 mutex_unlock(&mdsc->mutex);
3452
3453 mutex_lock(&session->s_mutex);
3454
3455 dout("handle_session mds%d %s %p state %s seq %llu\n",
3456 mds, ceph_session_op_name(op), session,
3457 ceph_session_state_name(session->s_state), seq);
3458
3459 if (session->s_state == CEPH_MDS_SESSION_HUNG) {
3460 session->s_state = CEPH_MDS_SESSION_OPEN;
3461 pr_info("mds%d came back\n", session->s_mds);
3462 }
3463
3464 switch (op) {
3465 case CEPH_SESSION_OPEN:
3466 if (session->s_state == CEPH_MDS_SESSION_RECONNECTING)
3467 pr_info("mds%d reconnect success\n", session->s_mds);
3468 session->s_state = CEPH_MDS_SESSION_OPEN;
3469 session->s_features = features;
3470 renewed_caps(mdsc, session, 0);
3471 if (test_bit(CEPHFS_FEATURE_METRIC_COLLECT, &session->s_features))
3472 metric_schedule_delayed(&mdsc->metric);
3473 wake = 1;
3474 if (mdsc->stopping)
3475 __close_session(mdsc, session);
3476 break;
3477
3478 case CEPH_SESSION_RENEWCAPS:
3479 if (session->s_renew_seq == seq)
3480 renewed_caps(mdsc, session, 1);
3481 break;
3482
3483 case CEPH_SESSION_CLOSE:
3484 if (session->s_state == CEPH_MDS_SESSION_RECONNECTING)
3485 pr_info("mds%d reconnect denied\n", session->s_mds);
3486 session->s_state = CEPH_MDS_SESSION_CLOSED;
3487 cleanup_session_requests(mdsc, session);
3488 remove_session_caps(session);
3489 wake = 2;
3490 wake_up_all(&mdsc->session_close_wq);
3491 break;
3492
3493 case CEPH_SESSION_STALE:
3494 pr_info("mds%d caps went stale, renewing\n",
3495 session->s_mds);
3496 atomic_inc(&session->s_cap_gen);
3497 session->s_cap_ttl = jiffies - 1;
3498 send_renew_caps(mdsc, session);
3499 break;
3500
3501 case CEPH_SESSION_RECALL_STATE:
3502 ceph_trim_caps(mdsc, session, le32_to_cpu(h->max_caps));
3503 break;
3504
3505 case CEPH_SESSION_FLUSHMSG:
3506 send_flushmsg_ack(mdsc, session, seq);
3507 break;
3508
3509 case CEPH_SESSION_FORCE_RO:
3510 dout("force_session_readonly %p\n", session);
3511 spin_lock(&session->s_cap_lock);
3512 session->s_readonly = true;
3513 spin_unlock(&session->s_cap_lock);
3514 wake_up_session_caps(session, FORCE_RO);
3515 break;
3516
3517 case CEPH_SESSION_REJECT:
3518 WARN_ON(session->s_state != CEPH_MDS_SESSION_OPENING);
3519 pr_info("mds%d rejected session\n", session->s_mds);
3520 session->s_state = CEPH_MDS_SESSION_REJECTED;
3521 cleanup_session_requests(mdsc, session);
3522 remove_session_caps(session);
3523 if (blocklisted)
3524 mdsc->fsc->blocklisted = true;
3525 wake = 2;
3526 break;
3527
3528 default:
3529 pr_err("mdsc_handle_session bad op %d mds%d\n", op, mds);
3530 WARN_ON(1);
3531 }
3532
3533 mutex_unlock(&session->s_mutex);
3534 if (wake) {
3535 mutex_lock(&mdsc->mutex);
3536 __wake_requests(mdsc, &session->s_waiting);
3537 if (wake == 2)
3538 kick_requests(mdsc, mds);
3539 mutex_unlock(&mdsc->mutex);
3540 }
3541 if (op == CEPH_SESSION_CLOSE)
3542 ceph_put_mds_session(session);
3543 return;
3544
3545bad:
3546 pr_err("mdsc_handle_session corrupt message mds%d len %d\n", mds,
3547 (int)msg->front.iov_len);
3548 ceph_msg_dump(msg);
3549 return;
3550}
3551
3552void ceph_mdsc_release_dir_caps(struct ceph_mds_request *req)
3553{
3554 int dcaps;
3555
3556 dcaps = xchg(&req->r_dir_caps, 0);
3557 if (dcaps) {
3558 dout("releasing r_dir_caps=%s\n", ceph_cap_string(dcaps));
3559 ceph_put_cap_refs(ceph_inode(req->r_parent), dcaps);
3560 }
3561}
3562
3563void ceph_mdsc_release_dir_caps_no_check(struct ceph_mds_request *req)
3564{
3565 int dcaps;
3566
3567 dcaps = xchg(&req->r_dir_caps, 0);
3568 if (dcaps) {
3569 dout("releasing r_dir_caps=%s\n", ceph_cap_string(dcaps));
3570 ceph_put_cap_refs_no_check_caps(ceph_inode(req->r_parent),
3571 dcaps);
3572 }
3573}
3574
3575
3576
3577
3578static void replay_unsafe_requests(struct ceph_mds_client *mdsc,
3579 struct ceph_mds_session *session)
3580{
3581 struct ceph_mds_request *req, *nreq;
3582 struct rb_node *p;
3583
3584 dout("replay_unsafe_requests mds%d\n", session->s_mds);
3585
3586 mutex_lock(&mdsc->mutex);
3587 list_for_each_entry_safe(req, nreq, &session->s_unsafe, r_unsafe_item)
3588 __send_request(session, req, true);
3589
3590
3591
3592
3593
3594 p = rb_first(&mdsc->request_tree);
3595 while (p) {
3596 req = rb_entry(p, struct ceph_mds_request, r_node);
3597 p = rb_next(p);
3598 if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags))
3599 continue;
3600 if (req->r_attempts == 0)
3601 continue;
3602 if (!req->r_session)
3603 continue;
3604 if (req->r_session->s_mds != session->s_mds)
3605 continue;
3606
3607 ceph_mdsc_release_dir_caps_no_check(req);
3608
3609 __send_request(session, req, true);
3610 }
3611 mutex_unlock(&mdsc->mutex);
3612}
3613
3614static int send_reconnect_partial(struct ceph_reconnect_state *recon_state)
3615{
3616 struct ceph_msg *reply;
3617 struct ceph_pagelist *_pagelist;
3618 struct page *page;
3619 __le32 *addr;
3620 int err = -ENOMEM;
3621
3622 if (!recon_state->allow_multi)
3623 return -ENOSPC;
3624
3625
3626 BUG_ON(!recon_state->nr_caps == !recon_state->nr_realms);
3627
3628
3629 _pagelist = ceph_pagelist_alloc(GFP_NOFS);
3630 if (!_pagelist)
3631 return -ENOMEM;
3632
3633 reply = ceph_msg_new2(CEPH_MSG_CLIENT_RECONNECT, 0, 1, GFP_NOFS, false);
3634 if (!reply)
3635 goto fail_msg;
3636
3637
3638 err = ceph_pagelist_encode_32(_pagelist, 0);
3639 if (err < 0)
3640 goto fail;
3641
3642 if (recon_state->nr_caps) {
3643
3644 err = ceph_pagelist_encode_32(recon_state->pagelist, 0);
3645 if (err)
3646 goto fail;
3647 } else {
3648
3649 err = ceph_pagelist_encode_32(_pagelist, 0);
3650 if (err < 0)
3651 goto fail;
3652 }
3653
3654 err = ceph_pagelist_encode_8(recon_state->pagelist, 1);
3655 if (err)
3656 goto fail;
3657
3658 page = list_first_entry(&recon_state->pagelist->head, struct page, lru);
3659 addr = kmap_atomic(page);
3660 if (recon_state->nr_caps) {
3661
3662 *addr = cpu_to_le32(recon_state->nr_caps);
3663 } else {
3664
3665 *(addr + 1) = cpu_to_le32(recon_state->nr_realms);
3666 }
3667 kunmap_atomic(addr);
3668
3669 reply->hdr.version = cpu_to_le16(5);
3670 reply->hdr.compat_version = cpu_to_le16(4);
3671
3672 reply->hdr.data_len = cpu_to_le32(recon_state->pagelist->length);
3673 ceph_msg_data_add_pagelist(reply, recon_state->pagelist);
3674
3675 ceph_con_send(&recon_state->session->s_con, reply);
3676 ceph_pagelist_release(recon_state->pagelist);
3677
3678 recon_state->pagelist = _pagelist;
3679 recon_state->nr_caps = 0;
3680 recon_state->nr_realms = 0;
3681 recon_state->msg_version = 5;
3682 return 0;
3683fail:
3684 ceph_msg_put(reply);
3685fail_msg:
3686 ceph_pagelist_release(_pagelist);
3687 return err;
3688}
3689
3690static struct dentry* d_find_primary(struct inode *inode)
3691{
3692 struct dentry *alias, *dn = NULL;
3693
3694 if (hlist_empty(&inode->i_dentry))
3695 return NULL;
3696
3697 spin_lock(&inode->i_lock);
3698 if (hlist_empty(&inode->i_dentry))
3699 goto out_unlock;
3700
3701 if (S_ISDIR(inode->i_mode)) {
3702 alias = hlist_entry(inode->i_dentry.first, struct dentry, d_u.d_alias);
3703 if (!IS_ROOT(alias))
3704 dn = dget(alias);
3705 goto out_unlock;
3706 }
3707
3708 hlist_for_each_entry(alias, &inode->i_dentry, d_u.d_alias) {
3709 spin_lock(&alias->d_lock);
3710 if (!d_unhashed(alias) &&
3711 (ceph_dentry(alias)->flags & CEPH_DENTRY_PRIMARY_LINK)) {
3712 dn = dget_dlock(alias);
3713 }
3714 spin_unlock(&alias->d_lock);
3715 if (dn)
3716 break;
3717 }
3718out_unlock:
3719 spin_unlock(&inode->i_lock);
3720 return dn;
3721}
3722
3723
3724
3725
3726static int reconnect_caps_cb(struct inode *inode, struct ceph_cap *cap,
3727 void *arg)
3728{
3729 union {
3730 struct ceph_mds_cap_reconnect v2;
3731 struct ceph_mds_cap_reconnect_v1 v1;
3732 } rec;
3733 struct ceph_inode_info *ci = cap->ci;
3734 struct ceph_reconnect_state *recon_state = arg;
3735 struct ceph_pagelist *pagelist = recon_state->pagelist;
3736 struct dentry *dentry;
3737 char *path;
3738 int pathlen, err;
3739 u64 pathbase;
3740 u64 snap_follows;
3741
3742 dout(" adding %p ino %llx.%llx cap %p %lld %s\n",
3743 inode, ceph_vinop(inode), cap, cap->cap_id,
3744 ceph_cap_string(cap->issued));
3745
3746 dentry = d_find_primary(inode);
3747 if (dentry) {
3748
3749 path = ceph_mdsc_build_path(dentry, &pathlen, &pathbase,
3750 recon_state->msg_version >= 2);
3751 dput(dentry);
3752 if (IS_ERR(path)) {
3753 err = PTR_ERR(path);
3754 goto out_err;
3755 }
3756 } else {
3757 path = NULL;
3758 pathlen = 0;
3759 pathbase = 0;
3760 }
3761
3762 spin_lock(&ci->i_ceph_lock);
3763 cap->seq = 0;
3764 cap->issue_seq = 0;
3765 cap->mseq = 0;
3766 cap->cap_gen = atomic_read(&cap->session->s_cap_gen);
3767
3768
3769 if (S_ISDIR(inode->i_mode)) {
3770 if (cap->issued & CEPH_CAP_DIR_CREATE) {
3771 ceph_put_string(rcu_dereference_raw(ci->i_cached_layout.pool_ns));
3772 memset(&ci->i_cached_layout, 0, sizeof(ci->i_cached_layout));
3773 }
3774 cap->issued &= ~CEPH_CAP_ANY_DIR_OPS;
3775 }
3776
3777 if (recon_state->msg_version >= 2) {
3778 rec.v2.cap_id = cpu_to_le64(cap->cap_id);
3779 rec.v2.wanted = cpu_to_le32(__ceph_caps_wanted(ci));
3780 rec.v2.issued = cpu_to_le32(cap->issued);
3781 rec.v2.snaprealm = cpu_to_le64(ci->i_snap_realm->ino);
3782 rec.v2.pathbase = cpu_to_le64(pathbase);
3783 rec.v2.flock_len = (__force __le32)
3784 ((ci->i_ceph_flags & CEPH_I_ERROR_FILELOCK) ? 0 : 1);
3785 } else {
3786 rec.v1.cap_id = cpu_to_le64(cap->cap_id);
3787 rec.v1.wanted = cpu_to_le32(__ceph_caps_wanted(ci));
3788 rec.v1.issued = cpu_to_le32(cap->issued);
3789 rec.v1.size = cpu_to_le64(i_size_read(inode));
3790 ceph_encode_timespec64(&rec.v1.mtime, &inode->i_mtime);
3791 ceph_encode_timespec64(&rec.v1.atime, &inode->i_atime);
3792 rec.v1.snaprealm = cpu_to_le64(ci->i_snap_realm->ino);
3793 rec.v1.pathbase = cpu_to_le64(pathbase);
3794 }
3795
3796 if (list_empty(&ci->i_cap_snaps)) {
3797 snap_follows = ci->i_head_snapc ? ci->i_head_snapc->seq : 0;
3798 } else {
3799 struct ceph_cap_snap *capsnap =
3800 list_first_entry(&ci->i_cap_snaps,
3801 struct ceph_cap_snap, ci_item);
3802 snap_follows = capsnap->follows;
3803 }
3804 spin_unlock(&ci->i_ceph_lock);
3805
3806 if (recon_state->msg_version >= 2) {
3807 int num_fcntl_locks, num_flock_locks;
3808 struct ceph_filelock *flocks = NULL;
3809 size_t struct_len, total_len = sizeof(u64);
3810 u8 struct_v = 0;
3811
3812encode_again:
3813 if (rec.v2.flock_len) {
3814 ceph_count_locks(inode, &num_fcntl_locks, &num_flock_locks);
3815 } else {
3816 num_fcntl_locks = 0;
3817 num_flock_locks = 0;
3818 }
3819 if (num_fcntl_locks + num_flock_locks > 0) {
3820 flocks = kmalloc_array(num_fcntl_locks + num_flock_locks,
3821 sizeof(struct ceph_filelock),
3822 GFP_NOFS);
3823 if (!flocks) {
3824 err = -ENOMEM;
3825 goto out_err;
3826 }
3827 err = ceph_encode_locks_to_buffer(inode, flocks,
3828 num_fcntl_locks,
3829 num_flock_locks);
3830 if (err) {
3831 kfree(flocks);
3832 flocks = NULL;
3833 if (err == -ENOSPC)
3834 goto encode_again;
3835 goto out_err;
3836 }
3837 } else {
3838 kfree(flocks);
3839 flocks = NULL;
3840 }
3841
3842 if (recon_state->msg_version >= 3) {
3843
3844 total_len += 2 * sizeof(u8) + sizeof(u32);
3845 struct_v = 2;
3846 }
3847
3848
3849
3850 struct_len = 2 * sizeof(u32) +
3851 (num_fcntl_locks + num_flock_locks) *
3852 sizeof(struct ceph_filelock);
3853 rec.v2.flock_len = cpu_to_le32(struct_len);
3854
3855 struct_len += sizeof(u32) + pathlen + sizeof(rec.v2);
3856
3857 if (struct_v >= 2)
3858 struct_len += sizeof(u64);
3859
3860 total_len += struct_len;
3861
3862 if (pagelist->length + total_len > RECONNECT_MAX_SIZE) {
3863 err = send_reconnect_partial(recon_state);
3864 if (err)
3865 goto out_freeflocks;
3866 pagelist = recon_state->pagelist;
3867 }
3868
3869 err = ceph_pagelist_reserve(pagelist, total_len);
3870 if (err)
3871 goto out_freeflocks;
3872
3873 ceph_pagelist_encode_64(pagelist, ceph_ino(inode));
3874 if (recon_state->msg_version >= 3) {
3875 ceph_pagelist_encode_8(pagelist, struct_v);
3876 ceph_pagelist_encode_8(pagelist, 1);
3877 ceph_pagelist_encode_32(pagelist, struct_len);
3878 }
3879 ceph_pagelist_encode_string(pagelist, path, pathlen);
3880 ceph_pagelist_append(pagelist, &rec, sizeof(rec.v2));
3881 ceph_locks_to_pagelist(flocks, pagelist,
3882 num_fcntl_locks, num_flock_locks);
3883 if (struct_v >= 2)
3884 ceph_pagelist_encode_64(pagelist, snap_follows);
3885out_freeflocks:
3886 kfree(flocks);
3887 } else {
3888 err = ceph_pagelist_reserve(pagelist,
3889 sizeof(u64) + sizeof(u32) +
3890 pathlen + sizeof(rec.v1));
3891 if (err)
3892 goto out_err;
3893
3894 ceph_pagelist_encode_64(pagelist, ceph_ino(inode));
3895 ceph_pagelist_encode_string(pagelist, path, pathlen);
3896 ceph_pagelist_append(pagelist, &rec, sizeof(rec.v1));
3897 }
3898
3899out_err:
3900 ceph_mdsc_free_path(path, pathlen);
3901 if (!err)
3902 recon_state->nr_caps++;
3903 return err;
3904}
3905
3906static int encode_snap_realms(struct ceph_mds_client *mdsc,
3907 struct ceph_reconnect_state *recon_state)
3908{
3909 struct rb_node *p;
3910 struct ceph_pagelist *pagelist = recon_state->pagelist;
3911 int err = 0;
3912
3913 if (recon_state->msg_version >= 4) {
3914 err = ceph_pagelist_encode_32(pagelist, mdsc->num_snap_realms);
3915 if (err < 0)
3916 goto fail;
3917 }
3918
3919
3920
3921
3922
3923
3924 for (p = rb_first(&mdsc->snap_realms); p; p = rb_next(p)) {
3925 struct ceph_snap_realm *realm =
3926 rb_entry(p, struct ceph_snap_realm, node);
3927 struct ceph_mds_snaprealm_reconnect sr_rec;
3928
3929 if (recon_state->msg_version >= 4) {
3930 size_t need = sizeof(u8) * 2 + sizeof(u32) +
3931 sizeof(sr_rec);
3932
3933 if (pagelist->length + need > RECONNECT_MAX_SIZE) {
3934 err = send_reconnect_partial(recon_state);
3935 if (err)
3936 goto fail;
3937 pagelist = recon_state->pagelist;
3938 }
3939
3940 err = ceph_pagelist_reserve(pagelist, need);
3941 if (err)
3942 goto fail;
3943
3944 ceph_pagelist_encode_8(pagelist, 1);
3945 ceph_pagelist_encode_8(pagelist, 1);
3946 ceph_pagelist_encode_32(pagelist, sizeof(sr_rec));
3947 }
3948
3949 dout(" adding snap realm %llx seq %lld parent %llx\n",
3950 realm->ino, realm->seq, realm->parent_ino);
3951 sr_rec.ino = cpu_to_le64(realm->ino);
3952 sr_rec.seq = cpu_to_le64(realm->seq);
3953 sr_rec.parent = cpu_to_le64(realm->parent_ino);
3954
3955 err = ceph_pagelist_append(pagelist, &sr_rec, sizeof(sr_rec));
3956 if (err)
3957 goto fail;
3958
3959 recon_state->nr_realms++;
3960 }
3961fail:
3962 return err;
3963}
3964
3965
3966
3967
3968
3969
3970
3971
3972
3973
3974
3975
3976static void send_mds_reconnect(struct ceph_mds_client *mdsc,
3977 struct ceph_mds_session *session)
3978{
3979 struct ceph_msg *reply;
3980 int mds = session->s_mds;
3981 int err = -ENOMEM;
3982 struct ceph_reconnect_state recon_state = {
3983 .session = session,
3984 };
3985 LIST_HEAD(dispose);
3986
3987 pr_info("mds%d reconnect start\n", mds);
3988
3989 recon_state.pagelist = ceph_pagelist_alloc(GFP_NOFS);
3990 if (!recon_state.pagelist)
3991 goto fail_nopagelist;
3992
3993 reply = ceph_msg_new2(CEPH_MSG_CLIENT_RECONNECT, 0, 1, GFP_NOFS, false);
3994 if (!reply)
3995 goto fail_nomsg;
3996
3997 xa_destroy(&session->s_delegated_inos);
3998
3999 mutex_lock(&session->s_mutex);
4000 session->s_state = CEPH_MDS_SESSION_RECONNECTING;
4001 session->s_seq = 0;
4002
4003 dout("session %p state %s\n", session,
4004 ceph_session_state_name(session->s_state));
4005
4006 atomic_inc(&session->s_cap_gen);
4007
4008 spin_lock(&session->s_cap_lock);
4009
4010 session->s_readonly = 0;
4011
4012
4013
4014
4015
4016 session->s_cap_reconnect = 1;
4017
4018 detach_cap_releases(session, &dispose);
4019 spin_unlock(&session->s_cap_lock);
4020 dispose_cap_releases(mdsc, &dispose);
4021
4022
4023 if (mdsc->fsc->sb->s_root)
4024 shrink_dcache_parent(mdsc->fsc->sb->s_root);
4025
4026 ceph_con_close(&session->s_con);
4027 ceph_con_open(&session->s_con,
4028 CEPH_ENTITY_TYPE_MDS, mds,
4029 ceph_mdsmap_get_addr(mdsc->mdsmap, mds));
4030
4031
4032 replay_unsafe_requests(mdsc, session);
4033
4034 ceph_early_kick_flushing_caps(mdsc, session);
4035
4036 down_read(&mdsc->snap_rwsem);
4037
4038
4039 err = ceph_pagelist_encode_32(recon_state.pagelist, 0);
4040 if (err)
4041 goto fail;
4042
4043 if (test_bit(CEPHFS_FEATURE_MULTI_RECONNECT, &session->s_features)) {
4044 recon_state.msg_version = 3;
4045 recon_state.allow_multi = true;
4046 } else if (session->s_con.peer_features & CEPH_FEATURE_MDSENC) {
4047 recon_state.msg_version = 3;
4048 } else {
4049 recon_state.msg_version = 2;
4050 }
4051
4052 err = ceph_iterate_session_caps(session, reconnect_caps_cb, &recon_state);
4053
4054 spin_lock(&session->s_cap_lock);
4055 session->s_cap_reconnect = 0;
4056 spin_unlock(&session->s_cap_lock);
4057
4058 if (err < 0)
4059 goto fail;
4060
4061
4062 if (mdsc->num_snap_realms) {
4063 size_t total_len =
4064 recon_state.pagelist->length +
4065 mdsc->num_snap_realms *
4066 sizeof(struct ceph_mds_snaprealm_reconnect);
4067 if (recon_state.msg_version >= 4) {
4068
4069 total_len += sizeof(u32);
4070
4071 total_len += mdsc->num_snap_realms *
4072 (2 * sizeof(u8) + sizeof(u32));
4073 }
4074 if (total_len > RECONNECT_MAX_SIZE) {
4075 if (!recon_state.allow_multi) {
4076 err = -ENOSPC;
4077 goto fail;
4078 }
4079 if (recon_state.nr_caps) {
4080 err = send_reconnect_partial(&recon_state);
4081 if (err)
4082 goto fail;
4083 }
4084 recon_state.msg_version = 5;
4085 }
4086 }
4087
4088 err = encode_snap_realms(mdsc, &recon_state);
4089 if (err < 0)
4090 goto fail;
4091
4092 if (recon_state.msg_version >= 5) {
4093 err = ceph_pagelist_encode_8(recon_state.pagelist, 0);
4094 if (err < 0)
4095 goto fail;
4096 }
4097
4098 if (recon_state.nr_caps || recon_state.nr_realms) {
4099 struct page *page =
4100 list_first_entry(&recon_state.pagelist->head,
4101 struct page, lru);
4102 __le32 *addr = kmap_atomic(page);
4103 if (recon_state.nr_caps) {
4104 WARN_ON(recon_state.nr_realms != mdsc->num_snap_realms);
4105 *addr = cpu_to_le32(recon_state.nr_caps);
4106 } else if (recon_state.msg_version >= 4) {
4107 *(addr + 1) = cpu_to_le32(recon_state.nr_realms);
4108 }
4109 kunmap_atomic(addr);
4110 }
4111
4112 reply->hdr.version = cpu_to_le16(recon_state.msg_version);
4113 if (recon_state.msg_version >= 4)
4114 reply->hdr.compat_version = cpu_to_le16(4);
4115
4116 reply->hdr.data_len = cpu_to_le32(recon_state.pagelist->length);
4117 ceph_msg_data_add_pagelist(reply, recon_state.pagelist);
4118
4119 ceph_con_send(&session->s_con, reply);
4120
4121 mutex_unlock(&session->s_mutex);
4122
4123 mutex_lock(&mdsc->mutex);
4124 __wake_requests(mdsc, &session->s_waiting);
4125 mutex_unlock(&mdsc->mutex);
4126
4127 up_read(&mdsc->snap_rwsem);
4128 ceph_pagelist_release(recon_state.pagelist);
4129 return;
4130
4131fail:
4132 ceph_msg_put(reply);
4133 up_read(&mdsc->snap_rwsem);
4134 mutex_unlock(&session->s_mutex);
4135fail_nomsg:
4136 ceph_pagelist_release(recon_state.pagelist);
4137fail_nopagelist:
4138 pr_err("error %d preparing reconnect for mds%d\n", err, mds);
4139 return;
4140}
4141
4142
4143
4144
4145
4146
4147
4148
4149static void check_new_map(struct ceph_mds_client *mdsc,
4150 struct ceph_mdsmap *newmap,
4151 struct ceph_mdsmap *oldmap)
4152{
4153 int i;
4154 int oldstate, newstate;
4155 struct ceph_mds_session *s;
4156
4157 dout("check_new_map new %u old %u\n",
4158 newmap->m_epoch, oldmap->m_epoch);
4159
4160 for (i = 0; i < oldmap->possible_max_rank && i < mdsc->max_sessions; i++) {
4161 if (!mdsc->sessions[i])
4162 continue;
4163 s = mdsc->sessions[i];
4164 oldstate = ceph_mdsmap_get_state(oldmap, i);
4165 newstate = ceph_mdsmap_get_state(newmap, i);
4166
4167 dout("check_new_map mds%d state %s%s -> %s%s (session %s)\n",
4168 i, ceph_mds_state_name(oldstate),
4169 ceph_mdsmap_is_laggy(oldmap, i) ? " (laggy)" : "",
4170 ceph_mds_state_name(newstate),
4171 ceph_mdsmap_is_laggy(newmap, i) ? " (laggy)" : "",
4172 ceph_session_state_name(s->s_state));
4173
4174 if (i >= newmap->possible_max_rank) {
4175
4176 ceph_get_mds_session(s);
4177 __unregister_session(mdsc, s);
4178 __wake_requests(mdsc, &s->s_waiting);
4179 mutex_unlock(&mdsc->mutex);
4180
4181 mutex_lock(&s->s_mutex);
4182 cleanup_session_requests(mdsc, s);
4183 remove_session_caps(s);
4184 mutex_unlock(&s->s_mutex);
4185
4186 ceph_put_mds_session(s);
4187
4188 mutex_lock(&mdsc->mutex);
4189 kick_requests(mdsc, i);
4190 continue;
4191 }
4192
4193 if (memcmp(ceph_mdsmap_get_addr(oldmap, i),
4194 ceph_mdsmap_get_addr(newmap, i),
4195 sizeof(struct ceph_entity_addr))) {
4196
4197 mutex_unlock(&mdsc->mutex);
4198 mutex_lock(&s->s_mutex);
4199 mutex_lock(&mdsc->mutex);
4200 ceph_con_close(&s->s_con);
4201 mutex_unlock(&s->s_mutex);
4202 s->s_state = CEPH_MDS_SESSION_RESTARTING;
4203 } else if (oldstate == newstate) {
4204 continue;
4205 }
4206
4207
4208
4209
4210 if (s->s_state == CEPH_MDS_SESSION_RESTARTING &&
4211 newstate >= CEPH_MDS_STATE_RECONNECT) {
4212 mutex_unlock(&mdsc->mutex);
4213 send_mds_reconnect(mdsc, s);
4214 mutex_lock(&mdsc->mutex);
4215 }
4216
4217
4218
4219
4220 if (oldstate < CEPH_MDS_STATE_ACTIVE &&
4221 newstate >= CEPH_MDS_STATE_ACTIVE) {
4222 if (oldstate != CEPH_MDS_STATE_CREATING &&
4223 oldstate != CEPH_MDS_STATE_STARTING)
4224 pr_info("mds%d recovery completed\n", s->s_mds);
4225 kick_requests(mdsc, i);
4226 mutex_unlock(&mdsc->mutex);
4227 mutex_lock(&s->s_mutex);
4228 mutex_lock(&mdsc->mutex);
4229 ceph_kick_flushing_caps(mdsc, s);
4230 mutex_unlock(&s->s_mutex);
4231 wake_up_session_caps(s, RECONNECT);
4232 }
4233 }
4234
4235 for (i = 0; i < newmap->possible_max_rank && i < mdsc->max_sessions; i++) {
4236 s = mdsc->sessions[i];
4237 if (!s)
4238 continue;
4239 if (!ceph_mdsmap_is_laggy(newmap, i))
4240 continue;
4241 if (s->s_state == CEPH_MDS_SESSION_OPEN ||
4242 s->s_state == CEPH_MDS_SESSION_HUNG ||
4243 s->s_state == CEPH_MDS_SESSION_CLOSING) {
4244 dout(" connecting to export targets of laggy mds%d\n",
4245 i);
4246 __open_export_target_sessions(mdsc, s);
4247 }
4248 }
4249}
4250
4251
4252
4253
4254
4255
4256
4257
4258
4259
4260void __ceph_mdsc_drop_dentry_lease(struct dentry *dentry)
4261{
4262 struct ceph_dentry_info *di = ceph_dentry(dentry);
4263
4264 ceph_put_mds_session(di->lease_session);
4265 di->lease_session = NULL;
4266}
4267
4268static void handle_lease(struct ceph_mds_client *mdsc,
4269 struct ceph_mds_session *session,
4270 struct ceph_msg *msg)
4271{
4272 struct super_block *sb = mdsc->fsc->sb;
4273 struct inode *inode;
4274 struct dentry *parent, *dentry;
4275 struct ceph_dentry_info *di;
4276 int mds = session->s_mds;
4277 struct ceph_mds_lease *h = msg->front.iov_base;
4278 u32 seq;
4279 struct ceph_vino vino;
4280 struct qstr dname;
4281 int release = 0;
4282
4283 dout("handle_lease from mds%d\n", mds);
4284
4285
4286 if (msg->front.iov_len < sizeof(*h) + sizeof(u32))
4287 goto bad;
4288 vino.ino = le64_to_cpu(h->ino);
4289 vino.snap = CEPH_NOSNAP;
4290 seq = le32_to_cpu(h->seq);
4291 dname.len = get_unaligned_le32(h + 1);
4292 if (msg->front.iov_len < sizeof(*h) + sizeof(u32) + dname.len)
4293 goto bad;
4294 dname.name = (void *)(h + 1) + sizeof(u32);
4295
4296
4297 inode = ceph_find_inode(sb, vino);
4298 dout("handle_lease %s, ino %llx %p %.*s\n",
4299 ceph_lease_op_name(h->action), vino.ino, inode,
4300 dname.len, dname.name);
4301
4302 mutex_lock(&session->s_mutex);
4303 inc_session_sequence(session);
4304
4305 if (!inode) {
4306 dout("handle_lease no inode %llx\n", vino.ino);
4307 goto release;
4308 }
4309
4310
4311 parent = d_find_alias(inode);
4312 if (!parent) {
4313 dout("no parent dentry on inode %p\n", inode);
4314 WARN_ON(1);
4315 goto release;
4316 }
4317 dname.hash = full_name_hash(parent, dname.name, dname.len);
4318 dentry = d_lookup(parent, &dname);
4319 dput(parent);
4320 if (!dentry)
4321 goto release;
4322
4323 spin_lock(&dentry->d_lock);
4324 di = ceph_dentry(dentry);
4325 switch (h->action) {
4326 case CEPH_MDS_LEASE_REVOKE:
4327 if (di->lease_session == session) {
4328 if (ceph_seq_cmp(di->lease_seq, seq) > 0)
4329 h->seq = cpu_to_le32(di->lease_seq);
4330 __ceph_mdsc_drop_dentry_lease(dentry);
4331 }
4332 release = 1;
4333 break;
4334
4335 case CEPH_MDS_LEASE_RENEW:
4336 if (di->lease_session == session &&
4337 di->lease_gen == atomic_read(&session->s_cap_gen) &&
4338 di->lease_renew_from &&
4339 di->lease_renew_after == 0) {
4340 unsigned long duration =
4341 msecs_to_jiffies(le32_to_cpu(h->duration_ms));
4342
4343 di->lease_seq = seq;
4344 di->time = di->lease_renew_from + duration;
4345 di->lease_renew_after = di->lease_renew_from +
4346 (duration >> 1);
4347 di->lease_renew_from = 0;
4348 }
4349 break;
4350 }
4351 spin_unlock(&dentry->d_lock);
4352 dput(dentry);
4353
4354 if (!release)
4355 goto out;
4356
4357release:
4358
4359 h->action = CEPH_MDS_LEASE_REVOKE_ACK;
4360 ceph_msg_get(msg);
4361 ceph_con_send(&session->s_con, msg);
4362
4363out:
4364 mutex_unlock(&session->s_mutex);
4365 iput(inode);
4366 return;
4367
4368bad:
4369 pr_err("corrupt lease message\n");
4370 ceph_msg_dump(msg);
4371}
4372
4373void ceph_mdsc_lease_send_msg(struct ceph_mds_session *session,
4374 struct dentry *dentry, char action,
4375 u32 seq)
4376{
4377 struct ceph_msg *msg;
4378 struct ceph_mds_lease *lease;
4379 struct inode *dir;
4380 int len = sizeof(*lease) + sizeof(u32) + NAME_MAX;
4381
4382 dout("lease_send_msg identry %p %s to mds%d\n",
4383 dentry, ceph_lease_op_name(action), session->s_mds);
4384
4385 msg = ceph_msg_new(CEPH_MSG_CLIENT_LEASE, len, GFP_NOFS, false);
4386 if (!msg)
4387 return;
4388 lease = msg->front.iov_base;
4389 lease->action = action;
4390 lease->seq = cpu_to_le32(seq);
4391
4392 spin_lock(&dentry->d_lock);
4393 dir = d_inode(dentry->d_parent);
4394 lease->ino = cpu_to_le64(ceph_ino(dir));
4395 lease->first = lease->last = cpu_to_le64(ceph_snap(dir));
4396
4397 put_unaligned_le32(dentry->d_name.len, lease + 1);
4398 memcpy((void *)(lease + 1) + 4,
4399 dentry->d_name.name, dentry->d_name.len);
4400 spin_unlock(&dentry->d_lock);
4401
4402
4403
4404
4405
4406 msg->more_to_follow = (action == CEPH_MDS_LEASE_RELEASE);
4407
4408 ceph_con_send(&session->s_con, msg);
4409}
4410
4411
4412
4413
4414static void lock_unlock_sessions(struct ceph_mds_client *mdsc)
4415{
4416 int i;
4417
4418 mutex_lock(&mdsc->mutex);
4419 for (i = 0; i < mdsc->max_sessions; i++) {
4420 struct ceph_mds_session *s = __ceph_lookup_mds_session(mdsc, i);
4421 if (!s)
4422 continue;
4423 mutex_unlock(&mdsc->mutex);
4424 mutex_lock(&s->s_mutex);
4425 mutex_unlock(&s->s_mutex);
4426 ceph_put_mds_session(s);
4427 mutex_lock(&mdsc->mutex);
4428 }
4429 mutex_unlock(&mdsc->mutex);
4430}
4431
4432static void maybe_recover_session(struct ceph_mds_client *mdsc)
4433{
4434 struct ceph_fs_client *fsc = mdsc->fsc;
4435
4436 if (!ceph_test_mount_opt(fsc, CLEANRECOVER))
4437 return;
4438
4439 if (READ_ONCE(fsc->mount_state) != CEPH_MOUNT_MOUNTED)
4440 return;
4441
4442 if (!READ_ONCE(fsc->blocklisted))
4443 return;
4444
4445 pr_info("auto reconnect after blocklisted\n");
4446 ceph_force_reconnect(fsc->sb);
4447}
4448
4449bool check_session_state(struct ceph_mds_session *s)
4450{
4451 switch (s->s_state) {
4452 case CEPH_MDS_SESSION_OPEN:
4453 if (s->s_ttl && time_after(jiffies, s->s_ttl)) {
4454 s->s_state = CEPH_MDS_SESSION_HUNG;
4455 pr_info("mds%d hung\n", s->s_mds);
4456 }
4457 break;
4458 case CEPH_MDS_SESSION_CLOSING:
4459
4460 WARN_ON_ONCE(s->s_ttl);
4461 fallthrough;
4462 case CEPH_MDS_SESSION_NEW:
4463 case CEPH_MDS_SESSION_RESTARTING:
4464 case CEPH_MDS_SESSION_CLOSED:
4465 case CEPH_MDS_SESSION_REJECTED:
4466 return false;
4467 }
4468
4469 return true;
4470}
4471
4472
4473
4474
4475
4476void inc_session_sequence(struct ceph_mds_session *s)
4477{
4478 lockdep_assert_held(&s->s_mutex);
4479
4480 s->s_seq++;
4481
4482 if (s->s_state == CEPH_MDS_SESSION_CLOSING) {
4483 int ret;
4484
4485 dout("resending session close request for mds%d\n", s->s_mds);
4486 ret = request_close_session(s);
4487 if (ret < 0)
4488 pr_err("unable to close session to mds%d: %d\n",
4489 s->s_mds, ret);
4490 }
4491}
4492
4493
4494
4495
4496
4497
4498static void schedule_delayed(struct ceph_mds_client *mdsc, unsigned long delay)
4499{
4500 unsigned long max_delay = HZ * 5;
4501
4502
4503 if (!delay || (delay > max_delay))
4504 delay = max_delay;
4505 schedule_delayed_work(&mdsc->delayed_work,
4506 round_jiffies_relative(delay));
4507}
4508
4509static void delayed_work(struct work_struct *work)
4510{
4511 struct ceph_mds_client *mdsc =
4512 container_of(work, struct ceph_mds_client, delayed_work.work);
4513 unsigned long delay;
4514 int renew_interval;
4515 int renew_caps;
4516 int i;
4517
4518 dout("mdsc delayed_work\n");
4519
4520 if (mdsc->stopping)
4521 return;
4522
4523 mutex_lock(&mdsc->mutex);
4524 renew_interval = mdsc->mdsmap->m_session_timeout >> 2;
4525 renew_caps = time_after_eq(jiffies, HZ*renew_interval +
4526 mdsc->last_renew_caps);
4527 if (renew_caps)
4528 mdsc->last_renew_caps = jiffies;
4529
4530 for (i = 0; i < mdsc->max_sessions; i++) {
4531 struct ceph_mds_session *s = __ceph_lookup_mds_session(mdsc, i);
4532 if (!s)
4533 continue;
4534
4535 if (!check_session_state(s)) {
4536 ceph_put_mds_session(s);
4537 continue;
4538 }
4539 mutex_unlock(&mdsc->mutex);
4540
4541 mutex_lock(&s->s_mutex);
4542 if (renew_caps)
4543 send_renew_caps(mdsc, s);
4544 else
4545 ceph_con_keepalive(&s->s_con);
4546 if (s->s_state == CEPH_MDS_SESSION_OPEN ||
4547 s->s_state == CEPH_MDS_SESSION_HUNG)
4548 ceph_send_cap_releases(mdsc, s);
4549 mutex_unlock(&s->s_mutex);
4550 ceph_put_mds_session(s);
4551
4552 mutex_lock(&mdsc->mutex);
4553 }
4554 mutex_unlock(&mdsc->mutex);
4555
4556 delay = ceph_check_delayed_caps(mdsc);
4557
4558 ceph_queue_cap_reclaim_work(mdsc);
4559
4560 ceph_trim_snapid_map(mdsc);
4561
4562 maybe_recover_session(mdsc);
4563
4564 schedule_delayed(mdsc, delay);
4565}
4566
4567int ceph_mdsc_init(struct ceph_fs_client *fsc)
4568
4569{
4570 struct ceph_mds_client *mdsc;
4571 int err;
4572
4573 mdsc = kzalloc(sizeof(struct ceph_mds_client), GFP_NOFS);
4574 if (!mdsc)
4575 return -ENOMEM;
4576 mdsc->fsc = fsc;
4577 mutex_init(&mdsc->mutex);
4578 mdsc->mdsmap = kzalloc(sizeof(*mdsc->mdsmap), GFP_NOFS);
4579 if (!mdsc->mdsmap) {
4580 err = -ENOMEM;
4581 goto err_mdsc;
4582 }
4583
4584 init_completion(&mdsc->safe_umount_waiters);
4585 init_waitqueue_head(&mdsc->session_close_wq);
4586 INIT_LIST_HEAD(&mdsc->waiting_for_map);
4587 mdsc->sessions = NULL;
4588 atomic_set(&mdsc->num_sessions, 0);
4589 mdsc->max_sessions = 0;
4590 mdsc->stopping = 0;
4591 atomic64_set(&mdsc->quotarealms_count, 0);
4592 mdsc->quotarealms_inodes = RB_ROOT;
4593 mutex_init(&mdsc->quotarealms_inodes_mutex);
4594 mdsc->last_snap_seq = 0;
4595 init_rwsem(&mdsc->snap_rwsem);
4596 mdsc->snap_realms = RB_ROOT;
4597 INIT_LIST_HEAD(&mdsc->snap_empty);
4598 mdsc->num_snap_realms = 0;
4599 spin_lock_init(&mdsc->snap_empty_lock);
4600 mdsc->last_tid = 0;
4601 mdsc->oldest_tid = 0;
4602 mdsc->request_tree = RB_ROOT;
4603 INIT_DELAYED_WORK(&mdsc->delayed_work, delayed_work);
4604 mdsc->last_renew_caps = jiffies;
4605 INIT_LIST_HEAD(&mdsc->cap_delay_list);
4606 INIT_LIST_HEAD(&mdsc->cap_wait_list);
4607 spin_lock_init(&mdsc->cap_delay_lock);
4608 INIT_LIST_HEAD(&mdsc->snap_flush_list);
4609 spin_lock_init(&mdsc->snap_flush_lock);
4610 mdsc->last_cap_flush_tid = 1;
4611 INIT_LIST_HEAD(&mdsc->cap_flush_list);
4612 INIT_LIST_HEAD(&mdsc->cap_dirty_migrating);
4613 mdsc->num_cap_flushing = 0;
4614 spin_lock_init(&mdsc->cap_dirty_lock);
4615 init_waitqueue_head(&mdsc->cap_flushing_wq);
4616 INIT_WORK(&mdsc->cap_reclaim_work, ceph_cap_reclaim_work);
4617 atomic_set(&mdsc->cap_reclaim_pending, 0);
4618 err = ceph_metric_init(&mdsc->metric);
4619 if (err)
4620 goto err_mdsmap;
4621
4622 spin_lock_init(&mdsc->dentry_list_lock);
4623 INIT_LIST_HEAD(&mdsc->dentry_leases);
4624 INIT_LIST_HEAD(&mdsc->dentry_dir_leases);
4625
4626 ceph_caps_init(mdsc);
4627 ceph_adjust_caps_max_min(mdsc, fsc->mount_options);
4628
4629 spin_lock_init(&mdsc->snapid_map_lock);
4630 mdsc->snapid_map_tree = RB_ROOT;
4631 INIT_LIST_HEAD(&mdsc->snapid_map_lru);
4632
4633 init_rwsem(&mdsc->pool_perm_rwsem);
4634 mdsc->pool_perm_tree = RB_ROOT;
4635
4636 strscpy(mdsc->nodename, utsname()->nodename,
4637 sizeof(mdsc->nodename));
4638
4639 fsc->mdsc = mdsc;
4640 return 0;
4641
4642err_mdsmap:
4643 kfree(mdsc->mdsmap);
4644err_mdsc:
4645 kfree(mdsc);
4646 return err;
4647}
4648
4649
4650
4651
4652
4653static void wait_requests(struct ceph_mds_client *mdsc)
4654{
4655 struct ceph_options *opts = mdsc->fsc->client->options;
4656 struct ceph_mds_request *req;
4657
4658 mutex_lock(&mdsc->mutex);
4659 if (__get_oldest_req(mdsc)) {
4660 mutex_unlock(&mdsc->mutex);
4661
4662 dout("wait_requests waiting for requests\n");
4663 wait_for_completion_timeout(&mdsc->safe_umount_waiters,
4664 ceph_timeout_jiffies(opts->mount_timeout));
4665
4666
4667 mutex_lock(&mdsc->mutex);
4668 while ((req = __get_oldest_req(mdsc))) {
4669 dout("wait_requests timed out on tid %llu\n",
4670 req->r_tid);
4671 list_del_init(&req->r_wait);
4672 __unregister_request(mdsc, req);
4673 }
4674 }
4675 mutex_unlock(&mdsc->mutex);
4676 dout("wait_requests done\n");
4677}
4678
4679
4680
4681
4682
4683void ceph_mdsc_pre_umount(struct ceph_mds_client *mdsc)
4684{
4685 dout("pre_umount\n");
4686 mdsc->stopping = 1;
4687
4688 lock_unlock_sessions(mdsc);
4689 ceph_flush_dirty_caps(mdsc);
4690 wait_requests(mdsc);
4691
4692
4693
4694
4695
4696 ceph_msgr_flush();
4697
4698 ceph_cleanup_quotarealms_inodes(mdsc);
4699}
4700
4701
4702
4703
4704static void wait_unsafe_requests(struct ceph_mds_client *mdsc, u64 want_tid)
4705{
4706 struct ceph_mds_request *req = NULL, *nextreq;
4707 struct rb_node *n;
4708
4709 mutex_lock(&mdsc->mutex);
4710 dout("wait_unsafe_requests want %lld\n", want_tid);
4711restart:
4712 req = __get_oldest_req(mdsc);
4713 while (req && req->r_tid <= want_tid) {
4714
4715 n = rb_next(&req->r_node);
4716 if (n)
4717 nextreq = rb_entry(n, struct ceph_mds_request, r_node);
4718 else
4719 nextreq = NULL;
4720 if (req->r_op != CEPH_MDS_OP_SETFILELOCK &&
4721 (req->r_op & CEPH_MDS_OP_WRITE)) {
4722
4723 ceph_mdsc_get_request(req);
4724 if (nextreq)
4725 ceph_mdsc_get_request(nextreq);
4726 mutex_unlock(&mdsc->mutex);
4727 dout("wait_unsafe_requests wait on %llu (want %llu)\n",
4728 req->r_tid, want_tid);
4729 wait_for_completion(&req->r_safe_completion);
4730 mutex_lock(&mdsc->mutex);
4731 ceph_mdsc_put_request(req);
4732 if (!nextreq)
4733 break;
4734 if (RB_EMPTY_NODE(&nextreq->r_node)) {
4735
4736 ceph_mdsc_put_request(nextreq);
4737 goto restart;
4738 }
4739 ceph_mdsc_put_request(nextreq);
4740 }
4741 req = nextreq;
4742 }
4743 mutex_unlock(&mdsc->mutex);
4744 dout("wait_unsafe_requests done\n");
4745}
4746
4747void ceph_mdsc_sync(struct ceph_mds_client *mdsc)
4748{
4749 u64 want_tid, want_flush;
4750
4751 if (READ_ONCE(mdsc->fsc->mount_state) >= CEPH_MOUNT_SHUTDOWN)
4752 return;
4753
4754 dout("sync\n");
4755 mutex_lock(&mdsc->mutex);
4756 want_tid = mdsc->last_tid;
4757 mutex_unlock(&mdsc->mutex);
4758
4759 ceph_flush_dirty_caps(mdsc);
4760 spin_lock(&mdsc->cap_dirty_lock);
4761 want_flush = mdsc->last_cap_flush_tid;
4762 if (!list_empty(&mdsc->cap_flush_list)) {
4763 struct ceph_cap_flush *cf =
4764 list_last_entry(&mdsc->cap_flush_list,
4765 struct ceph_cap_flush, g_list);
4766 cf->wake = true;
4767 }
4768 spin_unlock(&mdsc->cap_dirty_lock);
4769
4770 dout("sync want tid %lld flush_seq %lld\n",
4771 want_tid, want_flush);
4772
4773 wait_unsafe_requests(mdsc, want_tid);
4774 wait_caps_flush(mdsc, want_flush);
4775}
4776
4777
4778
4779
4780static bool done_closing_sessions(struct ceph_mds_client *mdsc, int skipped)
4781{
4782 if (READ_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_SHUTDOWN)
4783 return true;
4784 return atomic_read(&mdsc->num_sessions) <= skipped;
4785}
4786
4787
4788
4789
4790void ceph_mdsc_close_sessions(struct ceph_mds_client *mdsc)
4791{
4792 struct ceph_options *opts = mdsc->fsc->client->options;
4793 struct ceph_mds_session *session;
4794 int i;
4795 int skipped = 0;
4796
4797 dout("close_sessions\n");
4798
4799
4800 mutex_lock(&mdsc->mutex);
4801 for (i = 0; i < mdsc->max_sessions; i++) {
4802 session = __ceph_lookup_mds_session(mdsc, i);
4803 if (!session)
4804 continue;
4805 mutex_unlock(&mdsc->mutex);
4806 mutex_lock(&session->s_mutex);
4807 if (__close_session(mdsc, session) <= 0)
4808 skipped++;
4809 mutex_unlock(&session->s_mutex);
4810 ceph_put_mds_session(session);
4811 mutex_lock(&mdsc->mutex);
4812 }
4813 mutex_unlock(&mdsc->mutex);
4814
4815 dout("waiting for sessions to close\n");
4816 wait_event_timeout(mdsc->session_close_wq,
4817 done_closing_sessions(mdsc, skipped),
4818 ceph_timeout_jiffies(opts->mount_timeout));
4819
4820
4821 mutex_lock(&mdsc->mutex);
4822 for (i = 0; i < mdsc->max_sessions; i++) {
4823 if (mdsc->sessions[i]) {
4824 session = ceph_get_mds_session(mdsc->sessions[i]);
4825 __unregister_session(mdsc, session);
4826 mutex_unlock(&mdsc->mutex);
4827 mutex_lock(&session->s_mutex);
4828 remove_session_caps(session);
4829 mutex_unlock(&session->s_mutex);
4830 ceph_put_mds_session(session);
4831 mutex_lock(&mdsc->mutex);
4832 }
4833 }
4834 WARN_ON(!list_empty(&mdsc->cap_delay_list));
4835 mutex_unlock(&mdsc->mutex);
4836
4837 ceph_cleanup_snapid_map(mdsc);
4838 ceph_cleanup_empty_realms(mdsc);
4839
4840 cancel_work_sync(&mdsc->cap_reclaim_work);
4841 cancel_delayed_work_sync(&mdsc->delayed_work);
4842
4843 dout("stopped\n");
4844}
4845
4846void ceph_mdsc_force_umount(struct ceph_mds_client *mdsc)
4847{
4848 struct ceph_mds_session *session;
4849 int mds;
4850
4851 dout("force umount\n");
4852
4853 mutex_lock(&mdsc->mutex);
4854 for (mds = 0; mds < mdsc->max_sessions; mds++) {
4855 session = __ceph_lookup_mds_session(mdsc, mds);
4856 if (!session)
4857 continue;
4858
4859 if (session->s_state == CEPH_MDS_SESSION_REJECTED)
4860 __unregister_session(mdsc, session);
4861 __wake_requests(mdsc, &session->s_waiting);
4862 mutex_unlock(&mdsc->mutex);
4863
4864 mutex_lock(&session->s_mutex);
4865 __close_session(mdsc, session);
4866 if (session->s_state == CEPH_MDS_SESSION_CLOSING) {
4867 cleanup_session_requests(mdsc, session);
4868 remove_session_caps(session);
4869 }
4870 mutex_unlock(&session->s_mutex);
4871 ceph_put_mds_session(session);
4872
4873 mutex_lock(&mdsc->mutex);
4874 kick_requests(mdsc, mds);
4875 }
4876 __wake_requests(mdsc, &mdsc->waiting_for_map);
4877 mutex_unlock(&mdsc->mutex);
4878}
4879
4880static void ceph_mdsc_stop(struct ceph_mds_client *mdsc)
4881{
4882 dout("stop\n");
4883
4884
4885
4886
4887
4888
4889
4890
4891 flush_delayed_work(&mdsc->delayed_work);
4892
4893 if (mdsc->mdsmap)
4894 ceph_mdsmap_destroy(mdsc->mdsmap);
4895 kfree(mdsc->sessions);
4896 ceph_caps_finalize(mdsc);
4897 ceph_pool_perm_destroy(mdsc);
4898}
4899
4900void ceph_mdsc_destroy(struct ceph_fs_client *fsc)
4901{
4902 struct ceph_mds_client *mdsc = fsc->mdsc;
4903 dout("mdsc_destroy %p\n", mdsc);
4904
4905 if (!mdsc)
4906 return;
4907
4908
4909 ceph_msgr_flush();
4910
4911 ceph_mdsc_stop(mdsc);
4912
4913 ceph_metric_destroy(&mdsc->metric);
4914
4915 flush_delayed_work(&mdsc->metric.delayed_work);
4916 fsc->mdsc = NULL;
4917 kfree(mdsc);
4918 dout("mdsc_destroy %p done\n", mdsc);
4919}
4920
4921void ceph_mdsc_handle_fsmap(struct ceph_mds_client *mdsc, struct ceph_msg *msg)
4922{
4923 struct ceph_fs_client *fsc = mdsc->fsc;
4924 const char *mds_namespace = fsc->mount_options->mds_namespace;
4925 void *p = msg->front.iov_base;
4926 void *end = p + msg->front.iov_len;
4927 u32 epoch;
4928 u32 num_fs;
4929 u32 mount_fscid = (u32)-1;
4930 int err = -EINVAL;
4931
4932 ceph_decode_need(&p, end, sizeof(u32), bad);
4933 epoch = ceph_decode_32(&p);
4934
4935 dout("handle_fsmap epoch %u\n", epoch);
4936
4937
4938 ceph_decode_skip_n(&p, end, 2 + sizeof(u32) * 3, bad);
4939
4940 ceph_decode_32_safe(&p, end, num_fs, bad);
4941 while (num_fs-- > 0) {
4942 void *info_p, *info_end;
4943 u32 info_len;
4944 u32 fscid, namelen;
4945
4946 ceph_decode_need(&p, end, 2 + sizeof(u32), bad);
4947 p += 2;
4948 info_len = ceph_decode_32(&p);
4949 ceph_decode_need(&p, end, info_len, bad);
4950 info_p = p;
4951 info_end = p + info_len;
4952 p = info_end;
4953
4954 ceph_decode_need(&info_p, info_end, sizeof(u32) * 2, bad);
4955 fscid = ceph_decode_32(&info_p);
4956 namelen = ceph_decode_32(&info_p);
4957 ceph_decode_need(&info_p, info_end, namelen, bad);
4958
4959 if (mds_namespace &&
4960 strlen(mds_namespace) == namelen &&
4961 !strncmp(mds_namespace, (char *)info_p, namelen)) {
4962 mount_fscid = fscid;
4963 break;
4964 }
4965 }
4966
4967 ceph_monc_got_map(&fsc->client->monc, CEPH_SUB_FSMAP, epoch);
4968 if (mount_fscid != (u32)-1) {
4969 fsc->client->monc.fs_cluster_id = mount_fscid;
4970 ceph_monc_want_map(&fsc->client->monc, CEPH_SUB_MDSMAP,
4971 0, true);
4972 ceph_monc_renew_subs(&fsc->client->monc);
4973 } else {
4974 err = -ENOENT;
4975 goto err_out;
4976 }
4977 return;
4978
4979bad:
4980 pr_err("error decoding fsmap\n");
4981err_out:
4982 mutex_lock(&mdsc->mutex);
4983 mdsc->mdsmap_err = err;
4984 __wake_requests(mdsc, &mdsc->waiting_for_map);
4985 mutex_unlock(&mdsc->mutex);
4986}
4987
4988
4989
4990
4991void ceph_mdsc_handle_mdsmap(struct ceph_mds_client *mdsc, struct ceph_msg *msg)
4992{
4993 u32 epoch;
4994 u32 maplen;
4995 void *p = msg->front.iov_base;
4996 void *end = p + msg->front.iov_len;
4997 struct ceph_mdsmap *newmap, *oldmap;
4998 struct ceph_fsid fsid;
4999 int err = -EINVAL;
5000
5001 ceph_decode_need(&p, end, sizeof(fsid)+2*sizeof(u32), bad);
5002 ceph_decode_copy(&p, &fsid, sizeof(fsid));
5003 if (ceph_check_fsid(mdsc->fsc->client, &fsid) < 0)
5004 return;
5005 epoch = ceph_decode_32(&p);
5006 maplen = ceph_decode_32(&p);
5007 dout("handle_map epoch %u len %d\n", epoch, (int)maplen);
5008
5009
5010 mutex_lock(&mdsc->mutex);
5011 if (mdsc->mdsmap && epoch <= mdsc->mdsmap->m_epoch) {
5012 dout("handle_map epoch %u <= our %u\n",
5013 epoch, mdsc->mdsmap->m_epoch);
5014 mutex_unlock(&mdsc->mutex);
5015 return;
5016 }
5017
5018 newmap = ceph_mdsmap_decode(&p, end, ceph_msgr2(mdsc->fsc->client));
5019 if (IS_ERR(newmap)) {
5020 err = PTR_ERR(newmap);
5021 goto bad_unlock;
5022 }
5023
5024
5025 if (mdsc->mdsmap) {
5026 oldmap = mdsc->mdsmap;
5027 mdsc->mdsmap = newmap;
5028 check_new_map(mdsc, newmap, oldmap);
5029 ceph_mdsmap_destroy(oldmap);
5030 } else {
5031 mdsc->mdsmap = newmap;
5032 }
5033 mdsc->fsc->max_file_size = min((loff_t)mdsc->mdsmap->m_max_file_size,
5034 MAX_LFS_FILESIZE);
5035
5036 __wake_requests(mdsc, &mdsc->waiting_for_map);
5037 ceph_monc_got_map(&mdsc->fsc->client->monc, CEPH_SUB_MDSMAP,
5038 mdsc->mdsmap->m_epoch);
5039
5040 mutex_unlock(&mdsc->mutex);
5041 schedule_delayed(mdsc, 0);
5042 return;
5043
5044bad_unlock:
5045 mutex_unlock(&mdsc->mutex);
5046bad:
5047 pr_err("error decoding mdsmap %d\n", err);
5048 return;
5049}
5050
5051static struct ceph_connection *mds_get_con(struct ceph_connection *con)
5052{
5053 struct ceph_mds_session *s = con->private;
5054
5055 if (ceph_get_mds_session(s))
5056 return con;
5057 return NULL;
5058}
5059
5060static void mds_put_con(struct ceph_connection *con)
5061{
5062 struct ceph_mds_session *s = con->private;
5063
5064 ceph_put_mds_session(s);
5065}
5066
5067
5068
5069
5070
5071static void mds_peer_reset(struct ceph_connection *con)
5072{
5073 struct ceph_mds_session *s = con->private;
5074 struct ceph_mds_client *mdsc = s->s_mdsc;
5075
5076 pr_warn("mds%d closed our session\n", s->s_mds);
5077 send_mds_reconnect(mdsc, s);
5078}
5079
5080static void mds_dispatch(struct ceph_connection *con, struct ceph_msg *msg)
5081{
5082 struct ceph_mds_session *s = con->private;
5083 struct ceph_mds_client *mdsc = s->s_mdsc;
5084 int type = le16_to_cpu(msg->hdr.type);
5085
5086 mutex_lock(&mdsc->mutex);
5087 if (__verify_registered_session(mdsc, s) < 0) {
5088 mutex_unlock(&mdsc->mutex);
5089 goto out;
5090 }
5091 mutex_unlock(&mdsc->mutex);
5092
5093 switch (type) {
5094 case CEPH_MSG_MDS_MAP:
5095 ceph_mdsc_handle_mdsmap(mdsc, msg);
5096 break;
5097 case CEPH_MSG_FS_MAP_USER:
5098 ceph_mdsc_handle_fsmap(mdsc, msg);
5099 break;
5100 case CEPH_MSG_CLIENT_SESSION:
5101 handle_session(s, msg);
5102 break;
5103 case CEPH_MSG_CLIENT_REPLY:
5104 handle_reply(s, msg);
5105 break;
5106 case CEPH_MSG_CLIENT_REQUEST_FORWARD:
5107 handle_forward(mdsc, s, msg);
5108 break;
5109 case CEPH_MSG_CLIENT_CAPS:
5110 ceph_handle_caps(s, msg);
5111 break;
5112 case CEPH_MSG_CLIENT_SNAP:
5113 ceph_handle_snap(mdsc, s, msg);
5114 break;
5115 case CEPH_MSG_CLIENT_LEASE:
5116 handle_lease(mdsc, s, msg);
5117 break;
5118 case CEPH_MSG_CLIENT_QUOTA:
5119 ceph_handle_quota(mdsc, s, msg);
5120 break;
5121
5122 default:
5123 pr_err("received unknown message type %d %s\n", type,
5124 ceph_msg_type_name(type));
5125 }
5126out:
5127 ceph_msg_put(msg);
5128}
5129
5130
5131
5132
5133
5134
5135
5136
5137
5138static struct ceph_auth_handshake *
5139mds_get_authorizer(struct ceph_connection *con, int *proto, int force_new)
5140{
5141 struct ceph_mds_session *s = con->private;
5142 struct ceph_mds_client *mdsc = s->s_mdsc;
5143 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
5144 struct ceph_auth_handshake *auth = &s->s_auth;
5145 int ret;
5146
5147 ret = __ceph_auth_get_authorizer(ac, auth, CEPH_ENTITY_TYPE_MDS,
5148 force_new, proto, NULL, NULL);
5149 if (ret)
5150 return ERR_PTR(ret);
5151
5152 return auth;
5153}
5154
5155static int mds_add_authorizer_challenge(struct ceph_connection *con,
5156 void *challenge_buf, int challenge_buf_len)
5157{
5158 struct ceph_mds_session *s = con->private;
5159 struct ceph_mds_client *mdsc = s->s_mdsc;
5160 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
5161
5162 return ceph_auth_add_authorizer_challenge(ac, s->s_auth.authorizer,
5163 challenge_buf, challenge_buf_len);
5164}
5165
5166static int mds_verify_authorizer_reply(struct ceph_connection *con)
5167{
5168 struct ceph_mds_session *s = con->private;
5169 struct ceph_mds_client *mdsc = s->s_mdsc;
5170 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
5171 struct ceph_auth_handshake *auth = &s->s_auth;
5172
5173 return ceph_auth_verify_authorizer_reply(ac, auth->authorizer,
5174 auth->authorizer_reply_buf, auth->authorizer_reply_buf_len,
5175 NULL, NULL, NULL, NULL);
5176}
5177
5178static int mds_invalidate_authorizer(struct ceph_connection *con)
5179{
5180 struct ceph_mds_session *s = con->private;
5181 struct ceph_mds_client *mdsc = s->s_mdsc;
5182 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
5183
5184 ceph_auth_invalidate_authorizer(ac, CEPH_ENTITY_TYPE_MDS);
5185
5186 return ceph_monc_validate_auth(&mdsc->fsc->client->monc);
5187}
5188
5189static int mds_get_auth_request(struct ceph_connection *con,
5190 void *buf, int *buf_len,
5191 void **authorizer, int *authorizer_len)
5192{
5193 struct ceph_mds_session *s = con->private;
5194 struct ceph_auth_client *ac = s->s_mdsc->fsc->client->monc.auth;
5195 struct ceph_auth_handshake *auth = &s->s_auth;
5196 int ret;
5197
5198 ret = ceph_auth_get_authorizer(ac, auth, CEPH_ENTITY_TYPE_MDS,
5199 buf, buf_len);
5200 if (ret)
5201 return ret;
5202
5203 *authorizer = auth->authorizer_buf;
5204 *authorizer_len = auth->authorizer_buf_len;
5205 return 0;
5206}
5207
5208static int mds_handle_auth_reply_more(struct ceph_connection *con,
5209 void *reply, int reply_len,
5210 void *buf, int *buf_len,
5211 void **authorizer, int *authorizer_len)
5212{
5213 struct ceph_mds_session *s = con->private;
5214 struct ceph_auth_client *ac = s->s_mdsc->fsc->client->monc.auth;
5215 struct ceph_auth_handshake *auth = &s->s_auth;
5216 int ret;
5217
5218 ret = ceph_auth_handle_svc_reply_more(ac, auth, reply, reply_len,
5219 buf, buf_len);
5220 if (ret)
5221 return ret;
5222
5223 *authorizer = auth->authorizer_buf;
5224 *authorizer_len = auth->authorizer_buf_len;
5225 return 0;
5226}
5227
5228static int mds_handle_auth_done(struct ceph_connection *con,
5229 u64 global_id, void *reply, int reply_len,
5230 u8 *session_key, int *session_key_len,
5231 u8 *con_secret, int *con_secret_len)
5232{
5233 struct ceph_mds_session *s = con->private;
5234 struct ceph_auth_client *ac = s->s_mdsc->fsc->client->monc.auth;
5235 struct ceph_auth_handshake *auth = &s->s_auth;
5236
5237 return ceph_auth_handle_svc_reply_done(ac, auth, reply, reply_len,
5238 session_key, session_key_len,
5239 con_secret, con_secret_len);
5240}
5241
5242static int mds_handle_auth_bad_method(struct ceph_connection *con,
5243 int used_proto, int result,
5244 const int *allowed_protos, int proto_cnt,
5245 const int *allowed_modes, int mode_cnt)
5246{
5247 struct ceph_mds_session *s = con->private;
5248 struct ceph_mon_client *monc = &s->s_mdsc->fsc->client->monc;
5249 int ret;
5250
5251 if (ceph_auth_handle_bad_authorizer(monc->auth, CEPH_ENTITY_TYPE_MDS,
5252 used_proto, result,
5253 allowed_protos, proto_cnt,
5254 allowed_modes, mode_cnt)) {
5255 ret = ceph_monc_validate_auth(monc);
5256 if (ret)
5257 return ret;
5258 }
5259
5260 return -EACCES;
5261}
5262
5263static struct ceph_msg *mds_alloc_msg(struct ceph_connection *con,
5264 struct ceph_msg_header *hdr, int *skip)
5265{
5266 struct ceph_msg *msg;
5267 int type = (int) le16_to_cpu(hdr->type);
5268 int front_len = (int) le32_to_cpu(hdr->front_len);
5269
5270 if (con->in_msg)
5271 return con->in_msg;
5272
5273 *skip = 0;
5274 msg = ceph_msg_new(type, front_len, GFP_NOFS, false);
5275 if (!msg) {
5276 pr_err("unable to allocate msg type %d len %d\n",
5277 type, front_len);
5278 return NULL;
5279 }
5280
5281 return msg;
5282}
5283
5284static int mds_sign_message(struct ceph_msg *msg)
5285{
5286 struct ceph_mds_session *s = msg->con->private;
5287 struct ceph_auth_handshake *auth = &s->s_auth;
5288
5289 return ceph_auth_sign_message(auth, msg);
5290}
5291
5292static int mds_check_message_signature(struct ceph_msg *msg)
5293{
5294 struct ceph_mds_session *s = msg->con->private;
5295 struct ceph_auth_handshake *auth = &s->s_auth;
5296
5297 return ceph_auth_check_message_signature(auth, msg);
5298}
5299
5300static const struct ceph_connection_operations mds_con_ops = {
5301 .get = mds_get_con,
5302 .put = mds_put_con,
5303 .alloc_msg = mds_alloc_msg,
5304 .dispatch = mds_dispatch,
5305 .peer_reset = mds_peer_reset,
5306 .get_authorizer = mds_get_authorizer,
5307 .add_authorizer_challenge = mds_add_authorizer_challenge,
5308 .verify_authorizer_reply = mds_verify_authorizer_reply,
5309 .invalidate_authorizer = mds_invalidate_authorizer,
5310 .sign_message = mds_sign_message,
5311 .check_message_signature = mds_check_message_signature,
5312 .get_auth_request = mds_get_auth_request,
5313 .handle_auth_reply_more = mds_handle_auth_reply_more,
5314 .handle_auth_done = mds_handle_auth_done,
5315 .handle_auth_bad_method = mds_handle_auth_bad_method,
5316};
5317
5318
5319