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arm64: dts: allwinner: pinebook: Remove unused AXP803 regulators
[linux/fpc-iii.git] / fs / ceph / mds_client.c
blobbbbbddf71326b1cf59ff589c9dcc2ddd93e854f0
1 // SPDX-License-Identifier: GPL-2.0
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
14 #include "super.h"
15 #include "mds_client.h"
16
17 #include <linux/ceph/ceph_features.h>
18 #include <linux/ceph/messenger.h>
19 #include <linux/ceph/decode.h>
20 #include <linux/ceph/pagelist.h>
21 #include <linux/ceph/auth.h>
22 #include <linux/ceph/debugfs.h>
23
24 #define RECONNECT_MAX_SIZE (INT_MAX - PAGE_SIZE)
25
26 /*
27 * A cluster of MDS (metadata server) daemons is responsible for
28 * managing the file system namespace (the directory hierarchy and
29 * inodes) and for coordinating shared access to storage. Metadata is
30 * partitioning hierarchically across a number of servers, and that
31 * partition varies over time as the cluster adjusts the distribution
32 * in order to balance load.
33 *
34 * The MDS client is primarily responsible to managing synchronous
35 * metadata requests for operations like open, unlink, and so forth.
36 * If there is a MDS failure, we find out about it when we (possibly
37 * request and) receive a new MDS map, and can resubmit affected
38 * requests.
39 *
40 * For the most part, though, we take advantage of a lossless
41 * communications channel to the MDS, and do not need to worry about
42 * timing out or resubmitting requests.
43 *
44 * We maintain a stateful "session" with each MDS we interact with.
45 * Within each session, we sent periodic heartbeat messages to ensure
46 * any capabilities or leases we have been issues remain valid. If
47 * the session times out and goes stale, our leases and capabilities
48 * are no longer valid.
49 */
50
51 struct ceph_reconnect_state {
52 struct ceph_mds_session *session;
53 int nr_caps, nr_realms;
54 struct ceph_pagelist *pagelist;
55 unsigned msg_version;
56 bool allow_multi;
57 };
58
59 static void __wake_requests(struct ceph_mds_client *mdsc,
60 struct list_head *head);
61 static void ceph_cap_release_work(struct work_struct *work);
62 static void ceph_cap_reclaim_work(struct work_struct *work);
63
64 static const struct ceph_connection_operations mds_con_ops;
65
66
67 /*
68 * mds reply parsing
69 */
70
71 static int parse_reply_info_quota(void **p, void *end,
72 struct ceph_mds_reply_info_in *info)
73 {
74 u8 struct_v, struct_compat;
75 u32 struct_len;
76
77 ceph_decode_8_safe(p, end, struct_v, bad);
78 ceph_decode_8_safe(p, end, struct_compat, bad);
79 /* struct_v is expected to be >= 1. we only
80 * understand encoding with struct_compat == 1. */
81 if (!struct_v || struct_compat != 1)
82 goto bad;
83 ceph_decode_32_safe(p, end, struct_len, bad);
84 ceph_decode_need(p, end, struct_len, bad);
85 end = *p + struct_len;
86 ceph_decode_64_safe(p, end, info->max_bytes, bad);
87 ceph_decode_64_safe(p, end, info->max_files, bad);
88 *p = end;
89 return 0;
90 bad:
91 return -EIO;
92 }
93
94 /*
95 * parse individual inode info
96 */
97 static int parse_reply_info_in(void **p, void *end,
98 struct ceph_mds_reply_info_in *info,
99 u64 features)
100 {
101 int err = 0;
102 u8 struct_v = 0;
103
104 if (features == (u64)-1) {
105 u32 struct_len;
106 u8 struct_compat;
107 ceph_decode_8_safe(p, end, struct_v, bad);
108 ceph_decode_8_safe(p, end, struct_compat, bad);
109 /* struct_v is expected to be >= 1. we only understand
110 * encoding with struct_compat == 1. */
111 if (!struct_v || struct_compat != 1)
112 goto bad;
113 ceph_decode_32_safe(p, end, struct_len, bad);
114 ceph_decode_need(p, end, struct_len, bad);
115 end = *p + struct_len;
116 }
117
118 ceph_decode_need(p, end, sizeof(struct ceph_mds_reply_inode), bad);
119 info->in = *p;
120 *p += sizeof(struct ceph_mds_reply_inode) +
121 sizeof(*info->in->fragtree.splits) *
122 le32_to_cpu(info->in->fragtree.nsplits);
123
124 ceph_decode_32_safe(p, end, info->symlink_len, bad);
125 ceph_decode_need(p, end, info->symlink_len, bad);
126 info->symlink = *p;
127 *p += info->symlink_len;
128
129 ceph_decode_copy_safe(p, end, &info->dir_layout,
130 sizeof(info->dir_layout), bad);
131 ceph_decode_32_safe(p, end, info->xattr_len, bad);
132 ceph_decode_need(p, end, info->xattr_len, bad);
133 info->xattr_data = *p;
134 *p += info->xattr_len;
135
136 if (features == (u64)-1) {
137 /* inline data */
138 ceph_decode_64_safe(p, end, info->inline_version, bad);
139 ceph_decode_32_safe(p, end, info->inline_len, bad);
140 ceph_decode_need(p, end, info->inline_len, bad);
141 info->inline_data = *p;
142 *p += info->inline_len;
143 /* quota */
144 err = parse_reply_info_quota(p, end, info);
145 if (err < 0)
146 goto out_bad;
147 /* pool namespace */
148 ceph_decode_32_safe(p, end, info->pool_ns_len, bad);
149 if (info->pool_ns_len > 0) {
150 ceph_decode_need(p, end, info->pool_ns_len, bad);
151 info->pool_ns_data = *p;
152 *p += info->pool_ns_len;
153 }
154
155 /* btime */
156 ceph_decode_need(p, end, sizeof(info->btime), bad);
157 ceph_decode_copy(p, &info->btime, sizeof(info->btime));
158
159 /* change attribute */
160 ceph_decode_64_safe(p, end, info->change_attr, bad);
161
162 /* dir pin */
163 if (struct_v >= 2) {
164 ceph_decode_32_safe(p, end, info->dir_pin, bad);
165 } else {
166 info->dir_pin = -ENODATA;
167 }
168
169 /* snapshot birth time, remains zero for v<=2 */
170 if (struct_v >= 3) {
171 ceph_decode_need(p, end, sizeof(info->snap_btime), bad);
172 ceph_decode_copy(p, &info->snap_btime,
173 sizeof(info->snap_btime));
174 } else {
175 memset(&info->snap_btime, 0, sizeof(info->snap_btime));
176 }
177
178 *p = end;
179 } else {
180 if (features & CEPH_FEATURE_MDS_INLINE_DATA) {
181 ceph_decode_64_safe(p, end, info->inline_version, bad);
182 ceph_decode_32_safe(p, end, info->inline_len, bad);
183 ceph_decode_need(p, end, info->inline_len, bad);
184 info->inline_data = *p;
185 *p += info->inline_len;
186 } else
187 info->inline_version = CEPH_INLINE_NONE;
188
189 if (features & CEPH_FEATURE_MDS_QUOTA) {
190 err = parse_reply_info_quota(p, end, info);
191 if (err < 0)
192 goto out_bad;
193 } else {
194 info->max_bytes = 0;
195 info->max_files = 0;
196 }
197
198 info->pool_ns_len = 0;
199 info->pool_ns_data = NULL;
200 if (features & CEPH_FEATURE_FS_FILE_LAYOUT_V2) {
201 ceph_decode_32_safe(p, end, info->pool_ns_len, bad);
202 if (info->pool_ns_len > 0) {
203 ceph_decode_need(p, end, info->pool_ns_len, bad);
204 info->pool_ns_data = *p;
205 *p += info->pool_ns_len;
206 }
207 }
208
209 if (features & CEPH_FEATURE_FS_BTIME) {
210 ceph_decode_need(p, end, sizeof(info->btime), bad);
211 ceph_decode_copy(p, &info->btime, sizeof(info->btime));
212 ceph_decode_64_safe(p, end, info->change_attr, bad);
213 }
214
215 info->dir_pin = -ENODATA;
216 /* info->snap_btime remains zero */
217 }
218 return 0;
219 bad:
220 err = -EIO;
221 out_bad:
222 return err;
223 }
224
225 static int parse_reply_info_dir(void **p, void *end,
226 struct ceph_mds_reply_dirfrag **dirfrag,
227 u64 features)
228 {
229 if (features == (u64)-1) {
230 u8 struct_v, struct_compat;
231 u32 struct_len;
232 ceph_decode_8_safe(p, end, struct_v, bad);
233 ceph_decode_8_safe(p, end, struct_compat, bad);
234 /* struct_v is expected to be >= 1. we only understand
235 * encoding whose struct_compat == 1. */
236 if (!struct_v || struct_compat != 1)
237 goto bad;
238 ceph_decode_32_safe(p, end, struct_len, bad);
239 ceph_decode_need(p, end, struct_len, bad);
240 end = *p + struct_len;
241 }
242
243 ceph_decode_need(p, end, sizeof(**dirfrag), bad);
244 *dirfrag = *p;
245 *p += sizeof(**dirfrag) + sizeof(u32) * le32_to_cpu((*dirfrag)->ndist);
246 if (unlikely(*p > end))
247 goto bad;
248 if (features == (u64)-1)
249 *p = end;
250 return 0;
251 bad:
252 return -EIO;
253 }
254
255 static int parse_reply_info_lease(void **p, void *end,
256 struct ceph_mds_reply_lease **lease,
257 u64 features)
258 {
259 if (features == (u64)-1) {
260 u8 struct_v, struct_compat;
261 u32 struct_len;
262 ceph_decode_8_safe(p, end, struct_v, bad);
263 ceph_decode_8_safe(p, end, struct_compat, bad);
264 /* struct_v is expected to be >= 1. we only understand
265 * encoding whose struct_compat == 1. */
266 if (!struct_v || struct_compat != 1)
267 goto bad;
268 ceph_decode_32_safe(p, end, struct_len, bad);
269 ceph_decode_need(p, end, struct_len, bad);
270 end = *p + struct_len;
271 }
272
273 ceph_decode_need(p, end, sizeof(**lease), bad);
274 *lease = *p;
275 *p += sizeof(**lease);
276 if (features == (u64)-1)
277 *p = end;
278 return 0;
279 bad:
280 return -EIO;
281 }
282
283 /*
284 * parse a normal reply, which may contain a (dir+)dentry and/or a
285 * target inode.
286 */
287 static int parse_reply_info_trace(void **p, void *end,
288 struct ceph_mds_reply_info_parsed *info,
289 u64 features)
290 {
291 int err;
292
293 if (info->head->is_dentry) {
294 err = parse_reply_info_in(p, end, &info->diri, features);
295 if (err < 0)
296 goto out_bad;
297
298 err = parse_reply_info_dir(p, end, &info->dirfrag, features);
299 if (err < 0)
300 goto out_bad;
301
302 ceph_decode_32_safe(p, end, info->dname_len, bad);
303 ceph_decode_need(p, end, info->dname_len, bad);
304 info->dname = *p;
305 *p += info->dname_len;
306
307 err = parse_reply_info_lease(p, end, &info->dlease, features);
308 if (err < 0)
309 goto out_bad;
310 }
311
312 if (info->head->is_target) {
313 err = parse_reply_info_in(p, end, &info->targeti, features);
314 if (err < 0)
315 goto out_bad;
316 }
317
318 if (unlikely(*p != end))
319 goto bad;
320 return 0;
321
322 bad:
323 err = -EIO;
324 out_bad:
325 pr_err("problem parsing mds trace %d\n", err);
326 return err;
327 }
328
329 /*
330 * parse readdir results
331 */
332 static int parse_reply_info_readdir(void **p, void *end,
333 struct ceph_mds_reply_info_parsed *info,
334 u64 features)
335 {
336 u32 num, i = 0;
337 int err;
338
339 err = parse_reply_info_dir(p, end, &info->dir_dir, features);
340 if (err < 0)
341 goto out_bad;
342
343 ceph_decode_need(p, end, sizeof(num) + 2, bad);
344 num = ceph_decode_32(p);
345 {
346 u16 flags = ceph_decode_16(p);
347 info->dir_end = !!(flags & CEPH_READDIR_FRAG_END);
348 info->dir_complete = !!(flags & CEPH_READDIR_FRAG_COMPLETE);
349 info->hash_order = !!(flags & CEPH_READDIR_HASH_ORDER);
350 info->offset_hash = !!(flags & CEPH_READDIR_OFFSET_HASH);
351 }
352 if (num == 0)
353 goto done;
354
355 BUG_ON(!info->dir_entries);
356 if ((unsigned long)(info->dir_entries + num) >
357 (unsigned long)info->dir_entries + info->dir_buf_size) {
358 pr_err("dir contents are larger than expected\n");
359 WARN_ON(1);
360 goto bad;
361 }
362
363 info->dir_nr = num;
364 while (num) {
365 struct ceph_mds_reply_dir_entry *rde = info->dir_entries + i;
366 /* dentry */
367 ceph_decode_32_safe(p, end, rde->name_len, bad);
368 ceph_decode_need(p, end, rde->name_len, bad);
369 rde->name = *p;
370 *p += rde->name_len;
371 dout("parsed dir dname '%.*s'\n", rde->name_len, rde->name);
372
373 /* dentry lease */
374 err = parse_reply_info_lease(p, end, &rde->lease, features);
375 if (err)
376 goto out_bad;
377 /* inode */
378 err = parse_reply_info_in(p, end, &rde->inode, features);
379 if (err < 0)
380 goto out_bad;
381 /* ceph_readdir_prepopulate() will update it */
382 rde->offset = 0;
383 i++;
384 num--;
385 }
386
387 done:
388 /* Skip over any unrecognized fields */
389 *p = end;
390 return 0;
391
392 bad:
393 err = -EIO;
394 out_bad:
395 pr_err("problem parsing dir contents %d\n", err);
396 return err;
397 }
398
399 /*
400 * parse fcntl F_GETLK results
401 */
402 static int parse_reply_info_filelock(void **p, void *end,
403 struct ceph_mds_reply_info_parsed *info,
404 u64 features)
405 {
406 if (*p + sizeof(*info->filelock_reply) > end)
407 goto bad;
408
409 info->filelock_reply = *p;
410
411 /* Skip over any unrecognized fields */
412 *p = end;
413 return 0;
414 bad:
415 return -EIO;
416 }
417
418 /*
419 * parse create results
420 */
421 static int parse_reply_info_create(void **p, void *end,
422 struct ceph_mds_reply_info_parsed *info,
423 u64 features)
424 {
425 if (features == (u64)-1 ||
426 (features & CEPH_FEATURE_REPLY_CREATE_INODE)) {
427 /* Malformed reply? */
428 if (*p == end) {
429 info->has_create_ino = false;
430 } else {
431 info->has_create_ino = true;
432 ceph_decode_64_safe(p, end, info->ino, bad);
433 }
434 } else {
435 if (*p != end)
436 goto bad;
437 }
438
439 /* Skip over any unrecognized fields */
440 *p = end;
441 return 0;
442 bad:
443 return -EIO;
444 }
445
446 /*
447 * parse extra results
448 */
449 static int parse_reply_info_extra(void **p, void *end,
450 struct ceph_mds_reply_info_parsed *info,
451 u64 features)
452 {
453 u32 op = le32_to_cpu(info->head->op);
454
455 if (op == CEPH_MDS_OP_GETFILELOCK)
456 return parse_reply_info_filelock(p, end, info, features);
457 else if (op == CEPH_MDS_OP_READDIR || op == CEPH_MDS_OP_LSSNAP)
458 return parse_reply_info_readdir(p, end, info, features);
459 else if (op == CEPH_MDS_OP_CREATE)
460 return parse_reply_info_create(p, end, info, features);
461 else
462 return -EIO;
463 }
464
465 /*
466 * parse entire mds reply
467 */
468 static int parse_reply_info(struct ceph_msg *msg,
469 struct ceph_mds_reply_info_parsed *info,
470 u64 features)
471 {
472 void *p, *end;
473 u32 len;
474 int err;
475
476 info->head = msg->front.iov_base;
477 p = msg->front.iov_base + sizeof(struct ceph_mds_reply_head);
478 end = p + msg->front.iov_len - sizeof(struct ceph_mds_reply_head);
479
480 /* trace */
481 ceph_decode_32_safe(&p, end, len, bad);
482 if (len > 0) {
483 ceph_decode_need(&p, end, len, bad);
484 err = parse_reply_info_trace(&p, p+len, info, features);
485 if (err < 0)
486 goto out_bad;
487 }
488
489 /* extra */
490 ceph_decode_32_safe(&p, end, len, bad);
491 if (len > 0) {
492 ceph_decode_need(&p, end, len, bad);
493 err = parse_reply_info_extra(&p, p+len, info, features);
494 if (err < 0)
495 goto out_bad;
496 }
497
498 /* snap blob */
499 ceph_decode_32_safe(&p, end, len, bad);
500 info->snapblob_len = len;
501 info->snapblob = p;
502 p += len;
503
504 if (p != end)
505 goto bad;
506 return 0;
507
508 bad:
509 err = -EIO;
510 out_bad:
511 pr_err("mds parse_reply err %d\n", err);
512 return err;
513 }
514
515 static void destroy_reply_info(struct ceph_mds_reply_info_parsed *info)
516 {
517 if (!info->dir_entries)
518 return;
519 free_pages((unsigned long)info->dir_entries, get_order(info->dir_buf_size));
520 }
521
522
523 /*
524 * sessions
525 */
526 const char *ceph_session_state_name(int s)
527 {
528 switch (s) {
529 case CEPH_MDS_SESSION_NEW: return "new";
530 case CEPH_MDS_SESSION_OPENING: return "opening";
531 case CEPH_MDS_SESSION_OPEN: return "open";
532 case CEPH_MDS_SESSION_HUNG: return "hung";
533 case CEPH_MDS_SESSION_CLOSING: return "closing";
534 case CEPH_MDS_SESSION_CLOSED: return "closed";
535 case CEPH_MDS_SESSION_RESTARTING: return "restarting";
536 case CEPH_MDS_SESSION_RECONNECTING: return "reconnecting";
537 case CEPH_MDS_SESSION_REJECTED: return "rejected";
538 default: return "???";
539 }
540 }
541
542 struct ceph_mds_session *ceph_get_mds_session(struct ceph_mds_session *s)
543 {
544 if (refcount_inc_not_zero(&s->s_ref)) {
545 dout("mdsc get_session %p %d -> %d\n", s,
546 refcount_read(&s->s_ref)-1, refcount_read(&s->s_ref));
547 return s;
548 } else {
549 dout("mdsc get_session %p 0 -- FAIL\n", s);
550 return NULL;
551 }
552 }
553
554 void ceph_put_mds_session(struct ceph_mds_session *s)
555 {
556 dout("mdsc put_session %p %d -> %d\n", s,
557 refcount_read(&s->s_ref), refcount_read(&s->s_ref)-1);
558 if (refcount_dec_and_test(&s->s_ref)) {
559 if (s->s_auth.authorizer)
560 ceph_auth_destroy_authorizer(s->s_auth.authorizer);
561 kfree(s);
562 }
563 }
564
565 /*
566 * called under mdsc->mutex
567 */
568 struct ceph_mds_session *__ceph_lookup_mds_session(struct ceph_mds_client *mdsc,
569 int mds)
570 {
571 if (mds >= mdsc->max_sessions || !mdsc->sessions[mds])
572 return NULL;
573 return ceph_get_mds_session(mdsc->sessions[mds]);
574 }
575
576 static bool __have_session(struct ceph_mds_client *mdsc, int mds)
577 {
578 if (mds >= mdsc->max_sessions || !mdsc->sessions[mds])
579 return false;
580 else
581 return true;
582 }
583
584 static int __verify_registered_session(struct ceph_mds_client *mdsc,
585 struct ceph_mds_session *s)
586 {
587 if (s->s_mds >= mdsc->max_sessions ||
588 mdsc->sessions[s->s_mds] != s)
589 return -ENOENT;
590 return 0;
591 }
592
593 /*
594 * create+register a new session for given mds.
595 * called under mdsc->mutex.
596 */
597 static struct ceph_mds_session *register_session(struct ceph_mds_client *mdsc,
598 int mds)
599 {
600 struct ceph_mds_session *s;
601
602 if (mds >= mdsc->mdsmap->possible_max_rank)
603 return ERR_PTR(-EINVAL);
604
605 s = kzalloc(sizeof(*s), GFP_NOFS);
606 if (!s)
607 return ERR_PTR(-ENOMEM);
608
609 if (mds >= mdsc->max_sessions) {
610 int newmax = 1 << get_count_order(mds + 1);
611 struct ceph_mds_session **sa;
612
613 dout("%s: realloc to %d\n", __func__, newmax);
614 sa = kcalloc(newmax, sizeof(void *), GFP_NOFS);
615 if (!sa)
616 goto fail_realloc;
617 if (mdsc->sessions) {
618 memcpy(sa, mdsc->sessions,
619 mdsc->max_sessions * sizeof(void *));
620 kfree(mdsc->sessions);
621 }
622 mdsc->sessions = sa;
623 mdsc->max_sessions = newmax;
624 }
625
626 dout("%s: mds%d\n", __func__, mds);
627 s->s_mdsc = mdsc;
628 s->s_mds = mds;
629 s->s_state = CEPH_MDS_SESSION_NEW;
630 s->s_ttl = 0;
631 s->s_seq = 0;
632 mutex_init(&s->s_mutex);
633
634 ceph_con_init(&s->s_con, s, &mds_con_ops, &mdsc->fsc->client->msgr);
635
636 spin_lock_init(&s->s_gen_ttl_lock);
637 s->s_cap_gen = 1;
638 s->s_cap_ttl = jiffies - 1;
639
640 spin_lock_init(&s->s_cap_lock);
641 s->s_renew_requested = 0;
642 s->s_renew_seq = 0;
643 INIT_LIST_HEAD(&s->s_caps);
644 s->s_nr_caps = 0;
645 refcount_set(&s->s_ref, 1);
646 INIT_LIST_HEAD(&s->s_waiting);
647 INIT_LIST_HEAD(&s->s_unsafe);
648 s->s_num_cap_releases = 0;
649 s->s_cap_reconnect = 0;
650 s->s_cap_iterator = NULL;
651 INIT_LIST_HEAD(&s->s_cap_releases);
652 INIT_WORK(&s->s_cap_release_work, ceph_cap_release_work);
653
654 INIT_LIST_HEAD(&s->s_cap_flushing);
655
656 mdsc->sessions[mds] = s;
657 atomic_inc(&mdsc->num_sessions);
658 refcount_inc(&s->s_ref); /* one ref to sessions[], one to caller */
659
660 ceph_con_open(&s->s_con, CEPH_ENTITY_TYPE_MDS, mds,
661 ceph_mdsmap_get_addr(mdsc->mdsmap, mds));
662
663 return s;
664
665 fail_realloc:
666 kfree(s);
667 return ERR_PTR(-ENOMEM);
668 }
669
670 /*
671 * called under mdsc->mutex
672 */
673 static void __unregister_session(struct ceph_mds_client *mdsc,
674 struct ceph_mds_session *s)
675 {
676 dout("__unregister_session mds%d %p\n", s->s_mds, s);
677 BUG_ON(mdsc->sessions[s->s_mds] != s);
678 mdsc->sessions[s->s_mds] = NULL;
679 ceph_con_close(&s->s_con);
680 ceph_put_mds_session(s);
681 atomic_dec(&mdsc->num_sessions);
682 }
683
684 /*
685 * drop session refs in request.
686 *
687 * should be last request ref, or hold mdsc->mutex
688 */
689 static void put_request_session(struct ceph_mds_request *req)
690 {
691 if (req->r_session) {
692 ceph_put_mds_session(req->r_session);
693 req->r_session = NULL;
694 }
695 }
696
697 void ceph_mdsc_release_request(struct kref *kref)
698 {
699 struct ceph_mds_request *req = container_of(kref,
700 struct ceph_mds_request,
701 r_kref);
702 destroy_reply_info(&req->r_reply_info);
703 if (req->r_request)
704 ceph_msg_put(req->r_request);
705 if (req->r_reply)
706 ceph_msg_put(req->r_reply);
707 if (req->r_inode) {
708 ceph_put_cap_refs(ceph_inode(req->r_inode), CEPH_CAP_PIN);
709 /* avoid calling iput_final() in mds dispatch threads */
710 ceph_async_iput(req->r_inode);
711 }
712 if (req->r_parent) {
713 ceph_put_cap_refs(ceph_inode(req->r_parent), CEPH_CAP_PIN);
714 ceph_async_iput(req->r_parent);
715 }
716 ceph_async_iput(req->r_target_inode);
717 if (req->r_dentry)
718 dput(req->r_dentry);
719 if (req->r_old_dentry)
720 dput(req->r_old_dentry);
721 if (req->r_old_dentry_dir) {
722 /*
723 * track (and drop pins for) r_old_dentry_dir
724 * separately, since r_old_dentry's d_parent may have
725 * changed between the dir mutex being dropped and
726 * this request being freed.
727 */
728 ceph_put_cap_refs(ceph_inode(req->r_old_dentry_dir),
729 CEPH_CAP_PIN);
730 ceph_async_iput(req->r_old_dentry_dir);
731 }
732 kfree(req->r_path1);
733 kfree(req->r_path2);
734 if (req->r_pagelist)
735 ceph_pagelist_release(req->r_pagelist);
736 put_request_session(req);
737 ceph_unreserve_caps(req->r_mdsc, &req->r_caps_reservation);
738 WARN_ON_ONCE(!list_empty(&req->r_wait));
739 kfree(req);
740 }
741
742 DEFINE_RB_FUNCS(request, struct ceph_mds_request, r_tid, r_node)
743
744 /*
745 * lookup session, bump ref if found.
746 *
747 * called under mdsc->mutex.
748 */
749 static struct ceph_mds_request *
750 lookup_get_request(struct ceph_mds_client *mdsc, u64 tid)
751 {
752 struct ceph_mds_request *req;
753
754 req = lookup_request(&mdsc->request_tree, tid);
755 if (req)
756 ceph_mdsc_get_request(req);
757
758 return req;
759 }
760
761 /*
762 * Register an in-flight request, and assign a tid. Link to directory
763 * are modifying (if any).
764 *
765 * Called under mdsc->mutex.
766 */
767 static void __register_request(struct ceph_mds_client *mdsc,
768 struct ceph_mds_request *req,
769 struct inode *dir)
770 {
771 int ret = 0;
772
773 req->r_tid = ++mdsc->last_tid;
774 if (req->r_num_caps) {
775 ret = ceph_reserve_caps(mdsc, &req->r_caps_reservation,
776 req->r_num_caps);
777 if (ret < 0) {
778 pr_err("__register_request %p "
779 "failed to reserve caps: %d\n", req, ret);
780 /* set req->r_err to fail early from __do_request */
781 req->r_err = ret;
782 return;
783 }
784 }
785 dout("__register_request %p tid %lld\n", req, req->r_tid);
786 ceph_mdsc_get_request(req);
787 insert_request(&mdsc->request_tree, req);
788
789 req->r_uid = current_fsuid();
790 req->r_gid = current_fsgid();
791
792 if (mdsc->oldest_tid == 0 && req->r_op != CEPH_MDS_OP_SETFILELOCK)
793 mdsc->oldest_tid = req->r_tid;
794
795 if (dir) {
796 ihold(dir);
797 req->r_unsafe_dir = dir;
798 }
799 }
800
801 static void __unregister_request(struct ceph_mds_client *mdsc,
802 struct ceph_mds_request *req)
803 {
804 dout("__unregister_request %p tid %lld\n", req, req->r_tid);
805
806 /* Never leave an unregistered request on an unsafe list! */
807 list_del_init(&req->r_unsafe_item);
808
809 if (req->r_tid == mdsc->oldest_tid) {
810 struct rb_node *p = rb_next(&req->r_node);
811 mdsc->oldest_tid = 0;
812 while (p) {
813 struct ceph_mds_request *next_req =
814 rb_entry(p, struct ceph_mds_request, r_node);
815 if (next_req->r_op != CEPH_MDS_OP_SETFILELOCK) {
816 mdsc->oldest_tid = next_req->r_tid;
817 break;
818 }
819 p = rb_next(p);
820 }
821 }
822
823 erase_request(&mdsc->request_tree, req);
824
825 if (req->r_unsafe_dir &&
826 test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) {
827 struct ceph_inode_info *ci = ceph_inode(req->r_unsafe_dir);
828 spin_lock(&ci->i_unsafe_lock);
829 list_del_init(&req->r_unsafe_dir_item);
830 spin_unlock(&ci->i_unsafe_lock);
831 }
832 if (req->r_target_inode &&
833 test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) {
834 struct ceph_inode_info *ci = ceph_inode(req->r_target_inode);
835 spin_lock(&ci->i_unsafe_lock);
836 list_del_init(&req->r_unsafe_target_item);
837 spin_unlock(&ci->i_unsafe_lock);
838 }
839
840 if (req->r_unsafe_dir) {
841 /* avoid calling iput_final() in mds dispatch threads */
842 ceph_async_iput(req->r_unsafe_dir);
843 req->r_unsafe_dir = NULL;
844 }
845
846 complete_all(&req->r_safe_completion);
847
848 ceph_mdsc_put_request(req);
849 }
850
851 /*
852 * Walk back up the dentry tree until we hit a dentry representing a
853 * non-snapshot inode. We do this using the rcu_read_lock (which must be held
854 * when calling this) to ensure that the objects won't disappear while we're
855 * working with them. Once we hit a candidate dentry, we attempt to take a
856 * reference to it, and return that as the result.
857 */
858 static struct inode *get_nonsnap_parent(struct dentry *dentry)
859 {
860 struct inode *inode = NULL;
861
862 while (dentry && !IS_ROOT(dentry)) {
863 inode = d_inode_rcu(dentry);
864 if (!inode || ceph_snap(inode) == CEPH_NOSNAP)
865 break;
866 dentry = dentry->d_parent;
867 }
868 if (inode)
869 inode = igrab(inode);
870 return inode;
871 }
872
873 /*
874 * Choose mds to send request to next. If there is a hint set in the
875 * request (e.g., due to a prior forward hint from the mds), use that.
876 * Otherwise, consult frag tree and/or caps to identify the
877 * appropriate mds. If all else fails, choose randomly.
878 *
879 * Called under mdsc->mutex.
880 */
881 static int __choose_mds(struct ceph_mds_client *mdsc,
882 struct ceph_mds_request *req,
883 bool *random)
884 {
885 struct inode *inode;
886 struct ceph_inode_info *ci;
887 struct ceph_cap *cap;
888 int mode = req->r_direct_mode;
889 int mds = -1;
890 u32 hash = req->r_direct_hash;
891 bool is_hash = test_bit(CEPH_MDS_R_DIRECT_IS_HASH, &req->r_req_flags);
892
893 if (random)
894 *random = false;
895
896 /*
897 * is there a specific mds we should try? ignore hint if we have
898 * no session and the mds is not up (active or recovering).
899 */
900 if (req->r_resend_mds >= 0 &&
901 (__have_session(mdsc, req->r_resend_mds) ||
902 ceph_mdsmap_get_state(mdsc->mdsmap, req->r_resend_mds) > 0)) {
903 dout("%s using resend_mds mds%d\n", __func__,
904 req->r_resend_mds);
905 return req->r_resend_mds;
906 }
907
908 if (mode == USE_RANDOM_MDS)
909 goto random;
910
911 inode = NULL;
912 if (req->r_inode) {
913 if (ceph_snap(req->r_inode) != CEPH_SNAPDIR) {
914 inode = req->r_inode;
915 ihold(inode);
916 } else {
917 /* req->r_dentry is non-null for LSSNAP request */
918 rcu_read_lock();
919 inode = get_nonsnap_parent(req->r_dentry);
920 rcu_read_unlock();
921 dout("%s using snapdir's parent %p\n", __func__, inode);
922 }
923 } else if (req->r_dentry) {
924 /* ignore race with rename; old or new d_parent is okay */
925 struct dentry *parent;
926 struct inode *dir;
927
928 rcu_read_lock();
929 parent = READ_ONCE(req->r_dentry->d_parent);
930 dir = req->r_parent ? : d_inode_rcu(parent);
931
932 if (!dir || dir->i_sb != mdsc->fsc->sb) {
933 /* not this fs or parent went negative */
934 inode = d_inode(req->r_dentry);
935 if (inode)
936 ihold(inode);
937 } else if (ceph_snap(dir) != CEPH_NOSNAP) {
938 /* direct snapped/virtual snapdir requests
939 * based on parent dir inode */
940 inode = get_nonsnap_parent(parent);
941 dout("%s using nonsnap parent %p\n", __func__, inode);
942 } else {
943 /* dentry target */
944 inode = d_inode(req->r_dentry);
945 if (!inode || mode == USE_AUTH_MDS) {
946 /* dir + name */
947 inode = igrab(dir);
948 hash = ceph_dentry_hash(dir, req->r_dentry);
949 is_hash = true;
950 } else {
951 ihold(inode);
952 }
953 }
954 rcu_read_unlock();
955 }
956
957 dout("%s %p is_hash=%d (0x%x) mode %d\n", __func__, inode, (int)is_hash,
958 hash, mode);
959 if (!inode)
960 goto random;
961 ci = ceph_inode(inode);
962
963 if (is_hash && S_ISDIR(inode->i_mode)) {
964 struct ceph_inode_frag frag;
965 int found;
966
967 ceph_choose_frag(ci, hash, &frag, &found);
968 if (found) {
969 if (mode == USE_ANY_MDS && frag.ndist > 0) {
970 u8 r;
971
972 /* choose a random replica */
973 get_random_bytes(&r, 1);
974 r %= frag.ndist;
975 mds = frag.dist[r];
976 dout("%s %p %llx.%llx frag %u mds%d (%d/%d)\n",
977 __func__, inode, ceph_vinop(inode),
978 frag.frag, mds, (int)r, frag.ndist);
979 if (ceph_mdsmap_get_state(mdsc->mdsmap, mds) >=
980 CEPH_MDS_STATE_ACTIVE &&
981 !ceph_mdsmap_is_laggy(mdsc->mdsmap, mds))
982 goto out;
983 }
984
985 /* since this file/dir wasn't known to be
986 * replicated, then we want to look for the
987 * authoritative mds. */
988 if (frag.mds >= 0) {
989 /* choose auth mds */
990 mds = frag.mds;
991 dout("%s %p %llx.%llx frag %u mds%d (auth)\n",
992 __func__, inode, ceph_vinop(inode),
993 frag.frag, mds);
994 if (ceph_mdsmap_get_state(mdsc->mdsmap, mds) >=
995 CEPH_MDS_STATE_ACTIVE) {
996 if (mode == USE_ANY_MDS &&
997 !ceph_mdsmap_is_laggy(mdsc->mdsmap,
998 mds))
999 goto out;
1000 }
1001 }
1002 mode = USE_AUTH_MDS;
1003 }
1004 }
1005
1006 spin_lock(&ci->i_ceph_lock);
1007 cap = NULL;
1008 if (mode == USE_AUTH_MDS)
1009 cap = ci->i_auth_cap;
1010 if (!cap && !RB_EMPTY_ROOT(&ci->i_caps))
1011 cap = rb_entry(rb_first(&ci->i_caps), struct ceph_cap, ci_node);
1012 if (!cap) {
1013 spin_unlock(&ci->i_ceph_lock);
1014 ceph_async_iput(inode);
1015 goto random;
1016 }
1017 mds = cap->session->s_mds;
1018 dout("%s %p %llx.%llx mds%d (%scap %p)\n", __func__,
1019 inode, ceph_vinop(inode), mds,
1020 cap == ci->i_auth_cap ? "auth " : "", cap);
1021 spin_unlock(&ci->i_ceph_lock);
1022 out:
1023 /* avoid calling iput_final() while holding mdsc->mutex or
1024 * in mds dispatch threads */
1025 ceph_async_iput(inode);
1026 return mds;
1027
1028 random:
1029 if (random)
1030 *random = true;
1031
1032 mds = ceph_mdsmap_get_random_mds(mdsc->mdsmap);
1033 dout("%s chose random mds%d\n", __func__, mds);
1034 return mds;
1035 }
1036
1037
1038 /*
1039 * session messages
1040 */
1041 static struct ceph_msg *create_session_msg(u32 op, u64 seq)
1042 {
1043 struct ceph_msg *msg;
1044 struct ceph_mds_session_head *h;
1045
1046 msg = ceph_msg_new(CEPH_MSG_CLIENT_SESSION, sizeof(*h), GFP_NOFS,
1047 false);
1048 if (!msg) {
1049 pr_err("create_session_msg ENOMEM creating msg\n");
1050 return NULL;
1051 }
1052 h = msg->front.iov_base;
1053 h->op = cpu_to_le32(op);
1054 h->seq = cpu_to_le64(seq);
1055
1056 return msg;
1057 }
1058
1059 static const unsigned char feature_bits[] = CEPHFS_FEATURES_CLIENT_SUPPORTED;
1060 #define FEATURE_BYTES(c) (DIV_ROUND_UP((size_t)feature_bits[c - 1] + 1, 64) * 8)
1061 static void encode_supported_features(void **p, void *end)
1062 {
1063 static const size_t count = ARRAY_SIZE(feature_bits);
1064
1065 if (count > 0) {
1066 size_t i;
1067 size_t size = FEATURE_BYTES(count);
1068
1069 BUG_ON(*p + 4 + size > end);
1070 ceph_encode_32(p, size);
1071 memset(*p, 0, size);
1072 for (i = 0; i < count; i++)
1073 ((unsigned char*)(*p))[i / 8] |= BIT(feature_bits[i] % 8);
1074 *p += size;
1075 } else {
1076 BUG_ON(*p + 4 > end);
1077 ceph_encode_32(p, 0);
1078 }
1079 }
1080
1081 /*
1082 * session message, specialization for CEPH_SESSION_REQUEST_OPEN
1083 * to include additional client metadata fields.
1084 */
1085 static struct ceph_msg *create_session_open_msg(struct ceph_mds_client *mdsc, u64 seq)
1086 {
1087 struct ceph_msg *msg;
1088 struct ceph_mds_session_head *h;
1089 int i = -1;
1090 int extra_bytes = 0;
1091 int metadata_key_count = 0;
1092 struct ceph_options *opt = mdsc->fsc->client->options;
1093 struct ceph_mount_options *fsopt = mdsc->fsc->mount_options;
1094 size_t size, count;
1095 void *p, *end;
1096
1097 const char* metadata[][2] = {
1098 {"hostname", mdsc->nodename},
1099 {"kernel_version", init_utsname()->release},
1100 {"entity_id", opt->name ? : ""},
1101 {"root", fsopt->server_path ? : "/"},
1102 {NULL, NULL}
1103 };
1104
1105 /* Calculate serialized length of metadata */
1106 extra_bytes = 4; /* map length */
1107 for (i = 0; metadata[i][0]; ++i) {
1108 extra_bytes += 8 + strlen(metadata[i][0]) +
1109 strlen(metadata[i][1]);
1110 metadata_key_count++;
1111 }
1112
1113 /* supported feature */
1114 size = 0;
1115 count = ARRAY_SIZE(feature_bits);
1116 if (count > 0)
1117 size = FEATURE_BYTES(count);
1118 extra_bytes += 4 + size;
1119
1120 /* Allocate the message */
1121 msg = ceph_msg_new(CEPH_MSG_CLIENT_SESSION, sizeof(*h) + extra_bytes,
1122 GFP_NOFS, false);
1123 if (!msg) {
1124 pr_err("create_session_msg ENOMEM creating msg\n");
1125 return NULL;
1126 }
1127 p = msg->front.iov_base;
1128 end = p + msg->front.iov_len;
1129
1130 h = p;
1131 h->op = cpu_to_le32(CEPH_SESSION_REQUEST_OPEN);
1132 h->seq = cpu_to_le64(seq);
1133
1134 /*
1135 * Serialize client metadata into waiting buffer space, using
1136 * the format that userspace expects for map<string, string>
1137 *
1138 * ClientSession messages with metadata are v3
1139 */
1140 msg->hdr.version = cpu_to_le16(3);
1141 msg->hdr.compat_version = cpu_to_le16(1);
1142
1143 /* The write pointer, following the session_head structure */
1144 p += sizeof(*h);
1145
1146 /* Number of entries in the map */
1147 ceph_encode_32(&p, metadata_key_count);
1148
1149 /* Two length-prefixed strings for each entry in the map */
1150 for (i = 0; metadata[i][0]; ++i) {
1151 size_t const key_len = strlen(metadata[i][0]);
1152 size_t const val_len = strlen(metadata[i][1]);
1153
1154 ceph_encode_32(&p, key_len);
1155 memcpy(p, metadata[i][0], key_len);
1156 p += key_len;
1157 ceph_encode_32(&p, val_len);
1158 memcpy(p, metadata[i][1], val_len);
1159 p += val_len;
1160 }
1161
1162 encode_supported_features(&p, end);
1163 msg->front.iov_len = p - msg->front.iov_base;
1164 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
1165
1166 return msg;
1167 }
1168
1169 /*
1170 * send session open request.
1171 *
1172 * called under mdsc->mutex
1173 */
1174 static int __open_session(struct ceph_mds_client *mdsc,
1175 struct ceph_mds_session *session)
1176 {
1177 struct ceph_msg *msg;
1178 int mstate;
1179 int mds = session->s_mds;
1180
1181 /* wait for mds to go active? */
1182 mstate = ceph_mdsmap_get_state(mdsc->mdsmap, mds);
1183 dout("open_session to mds%d (%s)\n", mds,
1184 ceph_mds_state_name(mstate));
1185 session->s_state = CEPH_MDS_SESSION_OPENING;
1186 session->s_renew_requested = jiffies;
1187
1188 /* send connect message */
1189 msg = create_session_open_msg(mdsc, session->s_seq);
1190 if (!msg)
1191 return -ENOMEM;
1192 ceph_con_send(&session->s_con, msg);
1193 return 0;
1194 }
1195
1196 /*
1197 * open sessions for any export targets for the given mds
1198 *
1199 * called under mdsc->mutex
1200 */
1201 static struct ceph_mds_session *
1202 __open_export_target_session(struct ceph_mds_client *mdsc, int target)
1203 {
1204 struct ceph_mds_session *session;
1205
1206 session = __ceph_lookup_mds_session(mdsc, target);
1207 if (!session) {
1208 session = register_session(mdsc, target);
1209 if (IS_ERR(session))
1210 return session;
1211 }
1212 if (session->s_state == CEPH_MDS_SESSION_NEW ||
1213 session->s_state == CEPH_MDS_SESSION_CLOSING)
1214 __open_session(mdsc, session);
1215
1216 return session;
1217 }
1218
1219 struct ceph_mds_session *
1220 ceph_mdsc_open_export_target_session(struct ceph_mds_client *mdsc, int target)
1221 {
1222 struct ceph_mds_session *session;
1223
1224 dout("open_export_target_session to mds%d\n", target);
1225
1226 mutex_lock(&mdsc->mutex);
1227 session = __open_export_target_session(mdsc, target);
1228 mutex_unlock(&mdsc->mutex);
1229
1230 return session;
1231 }
1232
1233 static void __open_export_target_sessions(struct ceph_mds_client *mdsc,
1234 struct ceph_mds_session *session)
1235 {
1236 struct ceph_mds_info *mi;
1237 struct ceph_mds_session *ts;
1238 int i, mds = session->s_mds;
1239
1240 if (mds >= mdsc->mdsmap->possible_max_rank)
1241 return;
1242
1243 mi = &mdsc->mdsmap->m_info[mds];
1244 dout("open_export_target_sessions for mds%d (%d targets)\n",
1245 session->s_mds, mi->num_export_targets);
1246
1247 for (i = 0; i < mi->num_export_targets; i++) {
1248 ts = __open_export_target_session(mdsc, mi->export_targets[i]);
1249 if (!IS_ERR(ts))
1250 ceph_put_mds_session(ts);
1251 }
1252 }
1253
1254 void ceph_mdsc_open_export_target_sessions(struct ceph_mds_client *mdsc,
1255 struct ceph_mds_session *session)
1256 {
1257 mutex_lock(&mdsc->mutex);
1258 __open_export_target_sessions(mdsc, session);
1259 mutex_unlock(&mdsc->mutex);
1260 }
1261
1262 /*
1263 * session caps
1264 */
1265
1266 static void detach_cap_releases(struct ceph_mds_session *session,
1267 struct list_head *target)
1268 {
1269 lockdep_assert_held(&session->s_cap_lock);
1270
1271 list_splice_init(&session->s_cap_releases, target);
1272 session->s_num_cap_releases = 0;
1273 dout("dispose_cap_releases mds%d\n", session->s_mds);
1274 }
1275
1276 static void dispose_cap_releases(struct ceph_mds_client *mdsc,
1277 struct list_head *dispose)
1278 {
1279 while (!list_empty(dispose)) {
1280 struct ceph_cap *cap;
1281 /* zero out the in-progress message */
1282 cap = list_first_entry(dispose, struct ceph_cap, session_caps);
1283 list_del(&cap->session_caps);
1284 ceph_put_cap(mdsc, cap);
1285 }
1286 }
1287
1288 static void cleanup_session_requests(struct ceph_mds_client *mdsc,
1289 struct ceph_mds_session *session)
1290 {
1291 struct ceph_mds_request *req;
1292 struct rb_node *p;
1293 struct ceph_inode_info *ci;
1294
1295 dout("cleanup_session_requests mds%d\n", session->s_mds);
1296 mutex_lock(&mdsc->mutex);
1297 while (!list_empty(&session->s_unsafe)) {
1298 req = list_first_entry(&session->s_unsafe,
1299 struct ceph_mds_request, r_unsafe_item);
1300 pr_warn_ratelimited(" dropping unsafe request %llu\n",
1301 req->r_tid);
1302 if (req->r_target_inode) {
1303 /* dropping unsafe change of inode's attributes */
1304 ci = ceph_inode(req->r_target_inode);
1305 errseq_set(&ci->i_meta_err, -EIO);
1306 }
1307 if (req->r_unsafe_dir) {
1308 /* dropping unsafe directory operation */
1309 ci = ceph_inode(req->r_unsafe_dir);
1310 errseq_set(&ci->i_meta_err, -EIO);
1311 }
1312 __unregister_request(mdsc, req);
1313 }
1314 /* zero r_attempts, so kick_requests() will re-send requests */
1315 p = rb_first(&mdsc->request_tree);
1316 while (p) {
1317 req = rb_entry(p, struct ceph_mds_request, r_node);
1318 p = rb_next(p);
1319 if (req->r_session &&
1320 req->r_session->s_mds == session->s_mds)
1321 req->r_attempts = 0;
1322 }
1323 mutex_unlock(&mdsc->mutex);
1324 }
1325
1326 /*
1327 * Helper to safely iterate over all caps associated with a session, with
1328 * special care taken to handle a racing __ceph_remove_cap().
1329 *
1330 * Caller must hold session s_mutex.
1331 */
1332 int ceph_iterate_session_caps(struct ceph_mds_session *session,
1333 int (*cb)(struct inode *, struct ceph_cap *,
1334 void *), void *arg)
1335 {
1336 struct list_head *p;
1337 struct ceph_cap *cap;
1338 struct inode *inode, *last_inode = NULL;
1339 struct ceph_cap *old_cap = NULL;
1340 int ret;
1341
1342 dout("iterate_session_caps %p mds%d\n", session, session->s_mds);
1343 spin_lock(&session->s_cap_lock);
1344 p = session->s_caps.next;
1345 while (p != &session->s_caps) {
1346 cap = list_entry(p, struct ceph_cap, session_caps);
1347 inode = igrab(&cap->ci->vfs_inode);
1348 if (!inode) {
1349 p = p->next;
1350 continue;
1351 }
1352 session->s_cap_iterator = cap;
1353 spin_unlock(&session->s_cap_lock);
1354
1355 if (last_inode) {
1356 /* avoid calling iput_final() while holding
1357 * s_mutex or in mds dispatch threads */
1358 ceph_async_iput(last_inode);
1359 last_inode = NULL;
1360 }
1361 if (old_cap) {
1362 ceph_put_cap(session->s_mdsc, old_cap);
1363 old_cap = NULL;
1364 }
1365
1366 ret = cb(inode, cap, arg);
1367 last_inode = inode;
1368
1369 spin_lock(&session->s_cap_lock);
1370 p = p->next;
1371 if (!cap->ci) {
1372 dout("iterate_session_caps finishing cap %p removal\n",
1373 cap);
1374 BUG_ON(cap->session != session);
1375 cap->session = NULL;
1376 list_del_init(&cap->session_caps);
1377 session->s_nr_caps--;
1378 if (cap->queue_release)
1379 __ceph_queue_cap_release(session, cap);
1380 else
1381 old_cap = cap; /* put_cap it w/o locks held */
1382 }
1383 if (ret < 0)
1384 goto out;
1385 }
1386 ret = 0;
1387 out:
1388 session->s_cap_iterator = NULL;
1389 spin_unlock(&session->s_cap_lock);
1390
1391 ceph_async_iput(last_inode);
1392 if (old_cap)
1393 ceph_put_cap(session->s_mdsc, old_cap);
1394
1395 return ret;
1396 }
1397
1398 static int remove_session_caps_cb(struct inode *inode, struct ceph_cap *cap,
1399 void *arg)
1400 {
1401 struct ceph_fs_client *fsc = (struct ceph_fs_client *)arg;
1402 struct ceph_inode_info *ci = ceph_inode(inode);
1403 LIST_HEAD(to_remove);
1404 bool dirty_dropped = false;
1405 bool invalidate = false;
1406
1407 dout("removing cap %p, ci is %p, inode is %p\n",
1408 cap, ci, &ci->vfs_inode);
1409 spin_lock(&ci->i_ceph_lock);
1410 if (cap->mds_wanted | cap->issued)
1411 ci->i_ceph_flags |= CEPH_I_CAP_DROPPED;
1412 __ceph_remove_cap(cap, false);
1413 if (!ci->i_auth_cap) {
1414 struct ceph_cap_flush *cf;
1415 struct ceph_mds_client *mdsc = fsc->mdsc;
1416
1417 if (READ_ONCE(fsc->mount_state) == CEPH_MOUNT_SHUTDOWN) {
1418 if (inode->i_data.nrpages > 0)
1419 invalidate = true;
1420 if (ci->i_wrbuffer_ref > 0)
1421 mapping_set_error(&inode->i_data, -EIO);
1422 }
1423
1424 while (!list_empty(&ci->i_cap_flush_list)) {
1425 cf = list_first_entry(&ci->i_cap_flush_list,
1426 struct ceph_cap_flush, i_list);
1427 list_move(&cf->i_list, &to_remove);
1428 }
1429
1430 spin_lock(&mdsc->cap_dirty_lock);
1431
1432 list_for_each_entry(cf, &to_remove, i_list)
1433 list_del(&cf->g_list);
1434
1435 if (!list_empty(&ci->i_dirty_item)) {
1436 pr_warn_ratelimited(
1437 " dropping dirty %s state for %p %lld\n",
1438 ceph_cap_string(ci->i_dirty_caps),
1439 inode, ceph_ino(inode));
1440 ci->i_dirty_caps = 0;
1441 list_del_init(&ci->i_dirty_item);
1442 dirty_dropped = true;
1443 }
1444 if (!list_empty(&ci->i_flushing_item)) {
1445 pr_warn_ratelimited(
1446 " dropping dirty+flushing %s state for %p %lld\n",
1447 ceph_cap_string(ci->i_flushing_caps),
1448 inode, ceph_ino(inode));
1449 ci->i_flushing_caps = 0;
1450 list_del_init(&ci->i_flushing_item);
1451 mdsc->num_cap_flushing--;
1452 dirty_dropped = true;
1453 }
1454 spin_unlock(&mdsc->cap_dirty_lock);
1455
1456 if (dirty_dropped) {
1457 errseq_set(&ci->i_meta_err, -EIO);
1458
1459 if (ci->i_wrbuffer_ref_head == 0 &&
1460 ci->i_wr_ref == 0 &&
1461 ci->i_dirty_caps == 0 &&
1462 ci->i_flushing_caps == 0) {
1463 ceph_put_snap_context(ci->i_head_snapc);
1464 ci->i_head_snapc = NULL;
1465 }
1466 }
1467
1468 if (atomic_read(&ci->i_filelock_ref) > 0) {
1469 /* make further file lock syscall return -EIO */
1470 ci->i_ceph_flags |= CEPH_I_ERROR_FILELOCK;
1471 pr_warn_ratelimited(" dropping file locks for %p %lld\n",
1472 inode, ceph_ino(inode));
1473 }
1474
1475 if (!ci->i_dirty_caps && ci->i_prealloc_cap_flush) {
1476 list_add(&ci->i_prealloc_cap_flush->i_list, &to_remove);
1477 ci->i_prealloc_cap_flush = NULL;
1478 }
1479 }
1480 spin_unlock(&ci->i_ceph_lock);
1481 while (!list_empty(&to_remove)) {
1482 struct ceph_cap_flush *cf;
1483 cf = list_first_entry(&to_remove,
1484 struct ceph_cap_flush, i_list);
1485 list_del(&cf->i_list);
1486 ceph_free_cap_flush(cf);
1487 }
1488
1489 wake_up_all(&ci->i_cap_wq);
1490 if (invalidate)
1491 ceph_queue_invalidate(inode);
1492 if (dirty_dropped)
1493 iput(inode);
1494 return 0;
1495 }
1496
1497 /*
1498 * caller must hold session s_mutex
1499 */
1500 static void remove_session_caps(struct ceph_mds_session *session)
1501 {
1502 struct ceph_fs_client *fsc = session->s_mdsc->fsc;
1503 struct super_block *sb = fsc->sb;
1504 LIST_HEAD(dispose);
1505
1506 dout("remove_session_caps on %p\n", session);
1507 ceph_iterate_session_caps(session, remove_session_caps_cb, fsc);
1508
1509 wake_up_all(&fsc->mdsc->cap_flushing_wq);
1510
1511 spin_lock(&session->s_cap_lock);
1512 if (session->s_nr_caps > 0) {
1513 struct inode *inode;
1514 struct ceph_cap *cap, *prev = NULL;
1515 struct ceph_vino vino;
1516 /*
1517 * iterate_session_caps() skips inodes that are being
1518 * deleted, we need to wait until deletions are complete.
1519 * __wait_on_freeing_inode() is designed for the job,
1520 * but it is not exported, so use lookup inode function
1521 * to access it.
1522 */
1523 while (!list_empty(&session->s_caps)) {
1524 cap = list_entry(session->s_caps.next,
1525 struct ceph_cap, session_caps);
1526 if (cap == prev)
1527 break;
1528 prev = cap;
1529 vino = cap->ci->i_vino;
1530 spin_unlock(&session->s_cap_lock);
1531
1532 inode = ceph_find_inode(sb, vino);
1533 /* avoid calling iput_final() while holding s_mutex */
1534 ceph_async_iput(inode);
1535
1536 spin_lock(&session->s_cap_lock);
1537 }
1538 }
1539
1540 // drop cap expires and unlock s_cap_lock
1541 detach_cap_releases(session, &dispose);
1542
1543 BUG_ON(session->s_nr_caps > 0);
1544 BUG_ON(!list_empty(&session->s_cap_flushing));
1545 spin_unlock(&session->s_cap_lock);
1546 dispose_cap_releases(session->s_mdsc, &dispose);
1547 }
1548
1549 enum {
1550 RECONNECT,
1551 RENEWCAPS,
1552 FORCE_RO,
1553 };
1554
1555 /*
1556 * wake up any threads waiting on this session's caps. if the cap is
1557 * old (didn't get renewed on the client reconnect), remove it now.
1558 *
1559 * caller must hold s_mutex.
1560 */
1561 static int wake_up_session_cb(struct inode *inode, struct ceph_cap *cap,
1562 void *arg)
1563 {
1564 struct ceph_inode_info *ci = ceph_inode(inode);
1565 unsigned long ev = (unsigned long)arg;
1566
1567 if (ev == RECONNECT) {
1568 spin_lock(&ci->i_ceph_lock);
1569 ci->i_wanted_max_size = 0;
1570 ci->i_requested_max_size = 0;
1571 spin_unlock(&ci->i_ceph_lock);
1572 } else if (ev == RENEWCAPS) {
1573 if (cap->cap_gen < cap->session->s_cap_gen) {
1574 /* mds did not re-issue stale cap */
1575 spin_lock(&ci->i_ceph_lock);
1576 cap->issued = cap->implemented = CEPH_CAP_PIN;
1577 /* make sure mds knows what we want */
1578 if (__ceph_caps_file_wanted(ci) & ~cap->mds_wanted)
1579 ci->i_ceph_flags |= CEPH_I_CAP_DROPPED;
1580 spin_unlock(&ci->i_ceph_lock);
1581 }
1582 } else if (ev == FORCE_RO) {
1583 }
1584 wake_up_all(&ci->i_cap_wq);
1585 return 0;
1586 }
1587
1588 static void wake_up_session_caps(struct ceph_mds_session *session, int ev)
1589 {
1590 dout("wake_up_session_caps %p mds%d\n", session, session->s_mds);
1591 ceph_iterate_session_caps(session, wake_up_session_cb,
1592 (void *)(unsigned long)ev);
1593 }
1594
1595 /*
1596 * Send periodic message to MDS renewing all currently held caps. The
1597 * ack will reset the expiration for all caps from this session.
1598 *
1599 * caller holds s_mutex
1600 */
1601 static int send_renew_caps(struct ceph_mds_client *mdsc,
1602 struct ceph_mds_session *session)
1603 {
1604 struct ceph_msg *msg;
1605 int state;
1606
1607 if (time_after_eq(jiffies, session->s_cap_ttl) &&
1608 time_after_eq(session->s_cap_ttl, session->s_renew_requested))
1609 pr_info("mds%d caps stale\n", session->s_mds);
1610 session->s_renew_requested = jiffies;
1611
1612 /* do not try to renew caps until a recovering mds has reconnected
1613 * with its clients. */
1614 state = ceph_mdsmap_get_state(mdsc->mdsmap, session->s_mds);
1615 if (state < CEPH_MDS_STATE_RECONNECT) {
1616 dout("send_renew_caps ignoring mds%d (%s)\n",
1617 session->s_mds, ceph_mds_state_name(state));
1618 return 0;
1619 }
1620
1621 dout("send_renew_caps to mds%d (%s)\n", session->s_mds,
1622 ceph_mds_state_name(state));
1623 msg = create_session_msg(CEPH_SESSION_REQUEST_RENEWCAPS,
1624 ++session->s_renew_seq);
1625 if (!msg)
1626 return -ENOMEM;
1627 ceph_con_send(&session->s_con, msg);
1628 return 0;
1629 }
1630
1631 static int send_flushmsg_ack(struct ceph_mds_client *mdsc,
1632 struct ceph_mds_session *session, u64 seq)
1633 {
1634 struct ceph_msg *msg;
1635
1636 dout("send_flushmsg_ack to mds%d (%s)s seq %lld\n",
1637 session->s_mds, ceph_session_state_name(session->s_state), seq);
1638 msg = create_session_msg(CEPH_SESSION_FLUSHMSG_ACK, seq);
1639 if (!msg)
1640 return -ENOMEM;
1641 ceph_con_send(&session->s_con, msg);
1642 return 0;
1643 }
1644
1645
1646 /*
1647 * Note new cap ttl, and any transition from stale -> not stale (fresh?).
1648 *
1649 * Called under session->s_mutex
1650 */
1651 static void renewed_caps(struct ceph_mds_client *mdsc,
1652 struct ceph_mds_session *session, int is_renew)
1653 {
1654 int was_stale;
1655 int wake = 0;
1656
1657 spin_lock(&session->s_cap_lock);
1658 was_stale = is_renew && time_after_eq(jiffies, session->s_cap_ttl);
1659
1660 session->s_cap_ttl = session->s_renew_requested +
1661 mdsc->mdsmap->m_session_timeout*HZ;
1662
1663 if (was_stale) {
1664 if (time_before(jiffies, session->s_cap_ttl)) {
1665 pr_info("mds%d caps renewed\n", session->s_mds);
1666 wake = 1;
1667 } else {
1668 pr_info("mds%d caps still stale\n", session->s_mds);
1669 }
1670 }
1671 dout("renewed_caps mds%d ttl now %lu, was %s, now %s\n",
1672 session->s_mds, session->s_cap_ttl, was_stale ? "stale" : "fresh",
1673 time_before(jiffies, session->s_cap_ttl) ? "stale" : "fresh");
1674 spin_unlock(&session->s_cap_lock);
1675
1676 if (wake)
1677 wake_up_session_caps(session, RENEWCAPS);
1678 }
1679
1680 /*
1681 * send a session close request
1682 */
1683 static int request_close_session(struct ceph_mds_client *mdsc,
1684 struct ceph_mds_session *session)
1685 {
1686 struct ceph_msg *msg;
1687
1688 dout("request_close_session mds%d state %s seq %lld\n",
1689 session->s_mds, ceph_session_state_name(session->s_state),
1690 session->s_seq);
1691 msg = create_session_msg(CEPH_SESSION_REQUEST_CLOSE, session->s_seq);
1692 if (!msg)
1693 return -ENOMEM;
1694 ceph_con_send(&session->s_con, msg);
1695 return 1;
1696 }
1697
1698 /*
1699 * Called with s_mutex held.
1700 */
1701 static int __close_session(struct ceph_mds_client *mdsc,
1702 struct ceph_mds_session *session)
1703 {
1704 if (session->s_state >= CEPH_MDS_SESSION_CLOSING)
1705 return 0;
1706 session->s_state = CEPH_MDS_SESSION_CLOSING;
1707 return request_close_session(mdsc, session);
1708 }
1709
1710 static bool drop_negative_children(struct dentry *dentry)
1711 {
1712 struct dentry *child;
1713 bool all_negative = true;
1714
1715 if (!d_is_dir(dentry))
1716 goto out;
1717
1718 spin_lock(&dentry->d_lock);
1719 list_for_each_entry(child, &dentry->d_subdirs, d_child) {
1720 if (d_really_is_positive(child)) {
1721 all_negative = false;
1722 break;
1723 }
1724 }
1725 spin_unlock(&dentry->d_lock);
1726
1727 if (all_negative)
1728 shrink_dcache_parent(dentry);
1729 out:
1730 return all_negative;
1731 }
1732
1733 /*
1734 * Trim old(er) caps.
1735 *
1736 * Because we can't cache an inode without one or more caps, we do
1737 * this indirectly: if a cap is unused, we prune its aliases, at which
1738 * point the inode will hopefully get dropped to.
1739 *
1740 * Yes, this is a bit sloppy. Our only real goal here is to respond to
1741 * memory pressure from the MDS, though, so it needn't be perfect.
1742 */
1743 static int trim_caps_cb(struct inode *inode, struct ceph_cap *cap, void *arg)
1744 {
1745 int *remaining = arg;
1746 struct ceph_inode_info *ci = ceph_inode(inode);
1747 int used, wanted, oissued, mine;
1748
1749 if (*remaining <= 0)
1750 return -1;
1751
1752 spin_lock(&ci->i_ceph_lock);
1753 mine = cap->issued | cap->implemented;
1754 used = __ceph_caps_used(ci);
1755 wanted = __ceph_caps_file_wanted(ci);
1756 oissued = __ceph_caps_issued_other(ci, cap);
1757
1758 dout("trim_caps_cb %p cap %p mine %s oissued %s used %s wanted %s\n",
1759 inode, cap, ceph_cap_string(mine), ceph_cap_string(oissued),
1760 ceph_cap_string(used), ceph_cap_string(wanted));
1761 if (cap == ci->i_auth_cap) {
1762 if (ci->i_dirty_caps || ci->i_flushing_caps ||
1763 !list_empty(&ci->i_cap_snaps))
1764 goto out;
1765 if ((used | wanted) & CEPH_CAP_ANY_WR)
1766 goto out;
1767 /* Note: it's possible that i_filelock_ref becomes non-zero
1768 * after dropping auth caps. It doesn't hurt because reply
1769 * of lock mds request will re-add auth caps. */
1770 if (atomic_read(&ci->i_filelock_ref) > 0)
1771 goto out;
1772 }
1773 /* The inode has cached pages, but it's no longer used.
1774 * we can safely drop it */
1775 if (wanted == 0 && used == CEPH_CAP_FILE_CACHE &&
1776 !(oissued & CEPH_CAP_FILE_CACHE)) {
1777 used = 0;
1778 oissued = 0;
1779 }
1780 if ((used | wanted) & ~oissued & mine)
1781 goto out; /* we need these caps */
1782
1783 if (oissued) {
1784 /* we aren't the only cap.. just remove us */
1785 __ceph_remove_cap(cap, true);
1786 (*remaining)--;
1787 } else {
1788 struct dentry *dentry;
1789 /* try dropping referring dentries */
1790 spin_unlock(&ci->i_ceph_lock);
1791 dentry = d_find_any_alias(inode);
1792 if (dentry && drop_negative_children(dentry)) {
1793 int count;
1794 dput(dentry);
1795 d_prune_aliases(inode);
1796 count = atomic_read(&inode->i_count);
1797 if (count == 1)
1798 (*remaining)--;
1799 dout("trim_caps_cb %p cap %p pruned, count now %d\n",
1800 inode, cap, count);
1801 } else {
1802 dput(dentry);
1803 }
1804 return 0;
1805 }
1806
1807 out:
1808 spin_unlock(&ci->i_ceph_lock);
1809 return 0;
1810 }
1811
1812 /*
1813 * Trim session cap count down to some max number.
1814 */
1815 int ceph_trim_caps(struct ceph_mds_client *mdsc,
1816 struct ceph_mds_session *session,
1817 int max_caps)
1818 {
1819 int trim_caps = session->s_nr_caps - max_caps;
1820
1821 dout("trim_caps mds%d start: %d / %d, trim %d\n",
1822 session->s_mds, session->s_nr_caps, max_caps, trim_caps);
1823 if (trim_caps > 0) {
1824 int remaining = trim_caps;
1825
1826 ceph_iterate_session_caps(session, trim_caps_cb, &remaining);
1827 dout("trim_caps mds%d done: %d / %d, trimmed %d\n",
1828 session->s_mds, session->s_nr_caps, max_caps,
1829 trim_caps - remaining);
1830 }
1831
1832 ceph_flush_cap_releases(mdsc, session);
1833 return 0;
1834 }
1835
1836 static int check_caps_flush(struct ceph_mds_client *mdsc,
1837 u64 want_flush_tid)
1838 {
1839 int ret = 1;
1840
1841 spin_lock(&mdsc->cap_dirty_lock);
1842 if (!list_empty(&mdsc->cap_flush_list)) {
1843 struct ceph_cap_flush *cf =
1844 list_first_entry(&mdsc->cap_flush_list,
1845 struct ceph_cap_flush, g_list);
1846 if (cf->tid <= want_flush_tid) {
1847 dout("check_caps_flush still flushing tid "
1848 "%llu <= %llu\n", cf->tid, want_flush_tid);
1849 ret = 0;
1850 }
1851 }
1852 spin_unlock(&mdsc->cap_dirty_lock);
1853 return ret;
1854 }
1855
1856 /*
1857 * flush all dirty inode data to disk.
1858 *
1859 * returns true if we've flushed through want_flush_tid
1860 */
1861 static void wait_caps_flush(struct ceph_mds_client *mdsc,
1862 u64 want_flush_tid)
1863 {
1864 dout("check_caps_flush want %llu\n", want_flush_tid);
1865
1866 wait_event(mdsc->cap_flushing_wq,
1867 check_caps_flush(mdsc, want_flush_tid));
1868
1869 dout("check_caps_flush ok, flushed thru %llu\n", want_flush_tid);
1870 }
1871
1872 /*
1873 * called under s_mutex
1874 */
1875 static void ceph_send_cap_releases(struct ceph_mds_client *mdsc,
1876 struct ceph_mds_session *session)
1877 {
1878 struct ceph_msg *msg = NULL;
1879 struct ceph_mds_cap_release *head;
1880 struct ceph_mds_cap_item *item;
1881 struct ceph_osd_client *osdc = &mdsc->fsc->client->osdc;
1882 struct ceph_cap *cap;
1883 LIST_HEAD(tmp_list);
1884 int num_cap_releases;
1885 __le32 barrier, *cap_barrier;
1886
1887 down_read(&osdc->lock);
1888 barrier = cpu_to_le32(osdc->epoch_barrier);
1889 up_read(&osdc->lock);
1890
1891 spin_lock(&session->s_cap_lock);
1892 again:
1893 list_splice_init(&session->s_cap_releases, &tmp_list);
1894 num_cap_releases = session->s_num_cap_releases;
1895 session->s_num_cap_releases = 0;
1896 spin_unlock(&session->s_cap_lock);
1897
1898 while (!list_empty(&tmp_list)) {
1899 if (!msg) {
1900 msg = ceph_msg_new(CEPH_MSG_CLIENT_CAPRELEASE,
1901 PAGE_SIZE, GFP_NOFS, false);
1902 if (!msg)
1903 goto out_err;
1904 head = msg->front.iov_base;
1905 head->num = cpu_to_le32(0);
1906 msg->front.iov_len = sizeof(*head);
1907
1908 msg->hdr.version = cpu_to_le16(2);
1909 msg->hdr.compat_version = cpu_to_le16(1);
1910 }
1911
1912 cap = list_first_entry(&tmp_list, struct ceph_cap,
1913 session_caps);
1914 list_del(&cap->session_caps);
1915 num_cap_releases--;
1916
1917 head = msg->front.iov_base;
1918 put_unaligned_le32(get_unaligned_le32(&head->num) + 1,
1919 &head->num);
1920 item = msg->front.iov_base + msg->front.iov_len;
1921 item->ino = cpu_to_le64(cap->cap_ino);
1922 item->cap_id = cpu_to_le64(cap->cap_id);
1923 item->migrate_seq = cpu_to_le32(cap->mseq);
1924 item->seq = cpu_to_le32(cap->issue_seq);
1925 msg->front.iov_len += sizeof(*item);
1926
1927 ceph_put_cap(mdsc, cap);
1928
1929 if (le32_to_cpu(head->num) == CEPH_CAPS_PER_RELEASE) {
1930 // Append cap_barrier field
1931 cap_barrier = msg->front.iov_base + msg->front.iov_len;
1932 *cap_barrier = barrier;
1933 msg->front.iov_len += sizeof(*cap_barrier);
1934
1935 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
1936 dout("send_cap_releases mds%d %p\n", session->s_mds, msg);
1937 ceph_con_send(&session->s_con, msg);
1938 msg = NULL;
1939 }
1940 }
1941
1942 BUG_ON(num_cap_releases != 0);
1943
1944 spin_lock(&session->s_cap_lock);
1945 if (!list_empty(&session->s_cap_releases))
1946 goto again;
1947 spin_unlock(&session->s_cap_lock);
1948
1949 if (msg) {
1950 // Append cap_barrier field
1951 cap_barrier = msg->front.iov_base + msg->front.iov_len;
1952 *cap_barrier = barrier;
1953 msg->front.iov_len += sizeof(*cap_barrier);
1954
1955 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
1956 dout("send_cap_releases mds%d %p\n", session->s_mds, msg);
1957 ceph_con_send(&session->s_con, msg);
1958 }
1959 return;
1960 out_err:
1961 pr_err("send_cap_releases mds%d, failed to allocate message\n",
1962 session->s_mds);
1963 spin_lock(&session->s_cap_lock);
1964 list_splice(&tmp_list, &session->s_cap_releases);
1965 session->s_num_cap_releases += num_cap_releases;
1966 spin_unlock(&session->s_cap_lock);
1967 }
1968
1969 static void ceph_cap_release_work(struct work_struct *work)
1970 {
1971 struct ceph_mds_session *session =
1972 container_of(work, struct ceph_mds_session, s_cap_release_work);
1973
1974 mutex_lock(&session->s_mutex);
1975 if (session->s_state == CEPH_MDS_SESSION_OPEN ||
1976 session->s_state == CEPH_MDS_SESSION_HUNG)
1977 ceph_send_cap_releases(session->s_mdsc, session);
1978 mutex_unlock(&session->s_mutex);
1979 ceph_put_mds_session(session);
1980 }
1981
1982 void ceph_flush_cap_releases(struct ceph_mds_client *mdsc,
1983 struct ceph_mds_session *session)
1984 {
1985 if (mdsc->stopping)
1986 return;
1987
1988 ceph_get_mds_session(session);
1989 if (queue_work(mdsc->fsc->cap_wq,
1990 &session->s_cap_release_work)) {
1991 dout("cap release work queued\n");
1992 } else {
1993 ceph_put_mds_session(session);
1994 dout("failed to queue cap release work\n");
1995 }
1996 }
1997
1998 /*
1999 * caller holds session->s_cap_lock
2000 */
2001 void __ceph_queue_cap_release(struct ceph_mds_session *session,
2002 struct ceph_cap *cap)
2003 {
2004 list_add_tail(&cap->session_caps, &session->s_cap_releases);
2005 session->s_num_cap_releases++;
2006
2007 if (!(session->s_num_cap_releases % CEPH_CAPS_PER_RELEASE))
2008 ceph_flush_cap_releases(session->s_mdsc, session);
2009 }
2010
2011 static void ceph_cap_reclaim_work(struct work_struct *work)
2012 {
2013 struct ceph_mds_client *mdsc =
2014 container_of(work, struct ceph_mds_client, cap_reclaim_work);
2015 int ret = ceph_trim_dentries(mdsc);
2016 if (ret == -EAGAIN)
2017 ceph_queue_cap_reclaim_work(mdsc);
2018 }
2019
2020 void ceph_queue_cap_reclaim_work(struct ceph_mds_client *mdsc)
2021 {
2022 if (mdsc->stopping)
2023 return;
2024
2025 if (queue_work(mdsc->fsc->cap_wq, &mdsc->cap_reclaim_work)) {
2026 dout("caps reclaim work queued\n");
2027 } else {
2028 dout("failed to queue caps release work\n");
2029 }
2030 }
2031
2032 void ceph_reclaim_caps_nr(struct ceph_mds_client *mdsc, int nr)
2033 {
2034 int val;
2035 if (!nr)
2036 return;
2037 val = atomic_add_return(nr, &mdsc->cap_reclaim_pending);
2038 if ((val % CEPH_CAPS_PER_RELEASE) < nr) {
2039 atomic_set(&mdsc->cap_reclaim_pending, 0);
2040 ceph_queue_cap_reclaim_work(mdsc);
2041 }
2042 }
2043
2044 /*
2045 * requests
2046 */
2047
2048 int ceph_alloc_readdir_reply_buffer(struct ceph_mds_request *req,
2049 struct inode *dir)
2050 {
2051 struct ceph_inode_info *ci = ceph_inode(dir);
2052 struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
2053 struct ceph_mount_options *opt = req->r_mdsc->fsc->mount_options;
2054 size_t size = sizeof(struct ceph_mds_reply_dir_entry);
2055 unsigned int num_entries;
2056 int order;
2057
2058 spin_lock(&ci->i_ceph_lock);
2059 num_entries = ci->i_files + ci->i_subdirs;
2060 spin_unlock(&ci->i_ceph_lock);
2061 num_entries = max(num_entries, 1U);
2062 num_entries = min(num_entries, opt->max_readdir);
2063
2064 order = get_order(size * num_entries);
2065 while (order >= 0) {
2066 rinfo->dir_entries = (void*)__get_free_pages(GFP_KERNEL |
2067 __GFP_NOWARN,
2068 order);
2069 if (rinfo->dir_entries)
2070 break;
2071 order--;
2072 }
2073 if (!rinfo->dir_entries)
2074 return -ENOMEM;
2075
2076 num_entries = (PAGE_SIZE << order) / size;
2077 num_entries = min(num_entries, opt->max_readdir);
2078
2079 rinfo->dir_buf_size = PAGE_SIZE << order;
2080 req->r_num_caps = num_entries + 1;
2081 req->r_args.readdir.max_entries = cpu_to_le32(num_entries);
2082 req->r_args.readdir.max_bytes = cpu_to_le32(opt->max_readdir_bytes);
2083 return 0;
2084 }
2085
2086 /*
2087 * Create an mds request.
2088 */
2089 struct ceph_mds_request *
2090 ceph_mdsc_create_request(struct ceph_mds_client *mdsc, int op, int mode)
2091 {
2092 struct ceph_mds_request *req = kzalloc(sizeof(*req), GFP_NOFS);
2093
2094 if (!req)
2095 return ERR_PTR(-ENOMEM);
2096
2097 mutex_init(&req->r_fill_mutex);
2098 req->r_mdsc = mdsc;
2099 req->r_started = jiffies;
2100 req->r_resend_mds = -1;
2101 INIT_LIST_HEAD(&req->r_unsafe_dir_item);
2102 INIT_LIST_HEAD(&req->r_unsafe_target_item);
2103 req->r_fmode = -1;
2104 kref_init(&req->r_kref);
2105 RB_CLEAR_NODE(&req->r_node);
2106 INIT_LIST_HEAD(&req->r_wait);
2107 init_completion(&req->r_completion);
2108 init_completion(&req->r_safe_completion);
2109 INIT_LIST_HEAD(&req->r_unsafe_item);
2110
2111 ktime_get_coarse_real_ts64(&req->r_stamp);
2112
2113 req->r_op = op;
2114 req->r_direct_mode = mode;
2115 return req;
2116 }
2117
2118 /*
2119 * return oldest (lowest) request, tid in request tree, 0 if none.
2120 *
2121 * called under mdsc->mutex.
2122 */
2123 static struct ceph_mds_request *__get_oldest_req(struct ceph_mds_client *mdsc)
2124 {
2125 if (RB_EMPTY_ROOT(&mdsc->request_tree))
2126 return NULL;
2127 return rb_entry(rb_first(&mdsc->request_tree),
2128 struct ceph_mds_request, r_node);
2129 }
2130
2131 static inline u64 __get_oldest_tid(struct ceph_mds_client *mdsc)
2132 {
2133 return mdsc->oldest_tid;
2134 }
2135
2136 /*
2137 * Build a dentry's path. Allocate on heap; caller must kfree. Based
2138 * on build_path_from_dentry in fs/cifs/dir.c.
2139 *
2140 * If @stop_on_nosnap, generate path relative to the first non-snapped
2141 * inode.
2142 *
2143 * Encode hidden .snap dirs as a double /, i.e.
2144 * foo/.snap/bar -> foo//bar
2145 */
2146 char *ceph_mdsc_build_path(struct dentry *dentry, int *plen, u64 *pbase,
2147 int stop_on_nosnap)
2148 {
2149 struct dentry *temp;
2150 char *path;
2151 int pos;
2152 unsigned seq;
2153 u64 base;
2154
2155 if (!dentry)
2156 return ERR_PTR(-EINVAL);
2157
2158 path = __getname();
2159 if (!path)
2160 return ERR_PTR(-ENOMEM);
2161 retry:
2162 pos = PATH_MAX - 1;
2163 path[pos] = '\0';
2164
2165 seq = read_seqbegin(&rename_lock);
2166 rcu_read_lock();
2167 temp = dentry;
2168 for (;;) {
2169 struct inode *inode;
2170
2171 spin_lock(&temp->d_lock);
2172 inode = d_inode(temp);
2173 if (inode && ceph_snap(inode) == CEPH_SNAPDIR) {
2174 dout("build_path path+%d: %p SNAPDIR\n",
2175 pos, temp);
2176 } else if (stop_on_nosnap && inode && dentry != temp &&
2177 ceph_snap(inode) == CEPH_NOSNAP) {
2178 spin_unlock(&temp->d_lock);
2179 pos++; /* get rid of any prepended '/' */
2180 break;
2181 } else {
2182 pos -= temp->d_name.len;
2183 if (pos < 0) {
2184 spin_unlock(&temp->d_lock);
2185 break;
2186 }
2187 memcpy(path + pos, temp->d_name.name, temp->d_name.len);
2188 }
2189 spin_unlock(&temp->d_lock);
2190 temp = READ_ONCE(temp->d_parent);
2191
2192 /* Are we at the root? */
2193 if (IS_ROOT(temp))
2194 break;
2195
2196 /* Are we out of buffer? */
2197 if (--pos < 0)
2198 break;
2199
2200 path[pos] = '/';
2201 }
2202 base = ceph_ino(d_inode(temp));
2203 rcu_read_unlock();
2204
2205 if (read_seqretry(&rename_lock, seq))
2206 goto retry;
2207
2208 if (pos < 0) {
2209 /*
2210 * A rename didn't occur, but somehow we didn't end up where
2211 * we thought we would. Throw a warning and try again.
2212 */
2213 pr_warn("build_path did not end path lookup where "
2214 "expected, pos is %d\n", pos);
2215 goto retry;
2216 }
2217
2218 *pbase = base;
2219 *plen = PATH_MAX - 1 - pos;
2220 dout("build_path on %p %d built %llx '%.*s'\n",
2221 dentry, d_count(dentry), base, *plen, path + pos);
2222 return path + pos;
2223 }
2224
2225 static int build_dentry_path(struct dentry *dentry, struct inode *dir,
2226 const char **ppath, int *ppathlen, u64 *pino,
2227 bool *pfreepath, bool parent_locked)
2228 {
2229 char *path;
2230
2231 rcu_read_lock();
2232 if (!dir)
2233 dir = d_inode_rcu(dentry->d_parent);
2234 if (dir && parent_locked && ceph_snap(dir) == CEPH_NOSNAP) {
2235 *pino = ceph_ino(dir);
2236 rcu_read_unlock();
2237 *ppath = dentry->d_name.name;
2238 *ppathlen = dentry->d_name.len;
2239 return 0;
2240 }
2241 rcu_read_unlock();
2242 path = ceph_mdsc_build_path(dentry, ppathlen, pino, 1);
2243 if (IS_ERR(path))
2244 return PTR_ERR(path);
2245 *ppath = path;
2246 *pfreepath = true;
2247 return 0;
2248 }
2249
2250 static int build_inode_path(struct inode *inode,
2251 const char **ppath, int *ppathlen, u64 *pino,
2252 bool *pfreepath)
2253 {
2254 struct dentry *dentry;
2255 char *path;
2256
2257 if (ceph_snap(inode) == CEPH_NOSNAP) {
2258 *pino = ceph_ino(inode);
2259 *ppathlen = 0;
2260 return 0;
2261 }
2262 dentry = d_find_alias(inode);
2263 path = ceph_mdsc_build_path(dentry, ppathlen, pino, 1);
2264 dput(dentry);
2265 if (IS_ERR(path))
2266 return PTR_ERR(path);
2267 *ppath = path;
2268 *pfreepath = true;
2269 return 0;
2270 }
2271
2272 /*
2273 * request arguments may be specified via an inode *, a dentry *, or
2274 * an explicit ino+path.
2275 */
2276 static int set_request_path_attr(struct inode *rinode, struct dentry *rdentry,
2277 struct inode *rdiri, const char *rpath,
2278 u64 rino, const char **ppath, int *pathlen,
2279 u64 *ino, bool *freepath, bool parent_locked)
2280 {
2281 int r = 0;
2282
2283 if (rinode) {
2284 r = build_inode_path(rinode, ppath, pathlen, ino, freepath);
2285 dout(" inode %p %llx.%llx\n", rinode, ceph_ino(rinode),
2286 ceph_snap(rinode));
2287 } else if (rdentry) {
2288 r = build_dentry_path(rdentry, rdiri, ppath, pathlen, ino,
2289 freepath, parent_locked);
2290 dout(" dentry %p %llx/%.*s\n", rdentry, *ino, *pathlen,
2291 *ppath);
2292 } else if (rpath || rino) {
2293 *ino = rino;
2294 *ppath = rpath;
2295 *pathlen = rpath ? strlen(rpath) : 0;
2296 dout(" path %.*s\n", *pathlen, rpath);
2297 }
2298
2299 return r;
2300 }
2301
2302 /*
2303 * called under mdsc->mutex
2304 */
2305 static struct ceph_msg *create_request_message(struct ceph_mds_client *mdsc,
2306 struct ceph_mds_request *req,
2307 int mds, bool drop_cap_releases)
2308 {
2309 struct ceph_msg *msg;
2310 struct ceph_mds_request_head *head;
2311 const char *path1 = NULL;
2312 const char *path2 = NULL;
2313 u64 ino1 = 0, ino2 = 0;
2314 int pathlen1 = 0, pathlen2 = 0;
2315 bool freepath1 = false, freepath2 = false;
2316 int len;
2317 u16 releases;
2318 void *p, *end;
2319 int ret;
2320
2321 ret = set_request_path_attr(req->r_inode, req->r_dentry,
2322 req->r_parent, req->r_path1, req->r_ino1.ino,
2323 &path1, &pathlen1, &ino1, &freepath1,
2324 test_bit(CEPH_MDS_R_PARENT_LOCKED,
2325 &req->r_req_flags));
2326 if (ret < 0) {
2327 msg = ERR_PTR(ret);
2328 goto out;
2329 }
2330
2331 /* If r_old_dentry is set, then assume that its parent is locked */
2332 ret = set_request_path_attr(NULL, req->r_old_dentry,
2333 req->r_old_dentry_dir,
2334 req->r_path2, req->r_ino2.ino,
2335 &path2, &pathlen2, &ino2, &freepath2, true);
2336 if (ret < 0) {
2337 msg = ERR_PTR(ret);
2338 goto out_free1;
2339 }
2340
2341 len = sizeof(*head) +
2342 pathlen1 + pathlen2 + 2*(1 + sizeof(u32) + sizeof(u64)) +
2343 sizeof(struct ceph_timespec);
2344
2345 /* calculate (max) length for cap releases */
2346 len += sizeof(struct ceph_mds_request_release) *
2347 (!!req->r_inode_drop + !!req->r_dentry_drop +
2348 !!req->r_old_inode_drop + !!req->r_old_dentry_drop);
2349 if (req->r_dentry_drop)
2350 len += pathlen1;
2351 if (req->r_old_dentry_drop)
2352 len += pathlen2;
2353
2354 msg = ceph_msg_new2(CEPH_MSG_CLIENT_REQUEST, len, 1, GFP_NOFS, false);
2355 if (!msg) {
2356 msg = ERR_PTR(-ENOMEM);
2357 goto out_free2;
2358 }
2359
2360 msg->hdr.version = cpu_to_le16(2);
2361 msg->hdr.tid = cpu_to_le64(req->r_tid);
2362
2363 head = msg->front.iov_base;
2364 p = msg->front.iov_base + sizeof(*head);
2365 end = msg->front.iov_base + msg->front.iov_len;
2366
2367 head->mdsmap_epoch = cpu_to_le32(mdsc->mdsmap->m_epoch);
2368 head->op = cpu_to_le32(req->r_op);
2369 head->caller_uid = cpu_to_le32(from_kuid(&init_user_ns, req->r_uid));
2370 head->caller_gid = cpu_to_le32(from_kgid(&init_user_ns, req->r_gid));
2371 head->ino = 0;
2372 head->args = req->r_args;
2373
2374 ceph_encode_filepath(&p, end, ino1, path1);
2375 ceph_encode_filepath(&p, end, ino2, path2);
2376
2377 /* make note of release offset, in case we need to replay */
2378 req->r_request_release_offset = p - msg->front.iov_base;
2379
2380 /* cap releases */
2381 releases = 0;
2382 if (req->r_inode_drop)
2383 releases += ceph_encode_inode_release(&p,
2384 req->r_inode ? req->r_inode : d_inode(req->r_dentry),
2385 mds, req->r_inode_drop, req->r_inode_unless, 0);
2386 if (req->r_dentry_drop)
2387 releases += ceph_encode_dentry_release(&p, req->r_dentry,
2388 req->r_parent, mds, req->r_dentry_drop,
2389 req->r_dentry_unless);
2390 if (req->r_old_dentry_drop)
2391 releases += ceph_encode_dentry_release(&p, req->r_old_dentry,
2392 req->r_old_dentry_dir, mds,
2393 req->r_old_dentry_drop,
2394 req->r_old_dentry_unless);
2395 if (req->r_old_inode_drop)
2396 releases += ceph_encode_inode_release(&p,
2397 d_inode(req->r_old_dentry),
2398 mds, req->r_old_inode_drop, req->r_old_inode_unless, 0);
2399
2400 if (drop_cap_releases) {
2401 releases = 0;
2402 p = msg->front.iov_base + req->r_request_release_offset;
2403 }
2404
2405 head->num_releases = cpu_to_le16(releases);
2406
2407 /* time stamp */
2408 {
2409 struct ceph_timespec ts;
2410 ceph_encode_timespec64(&ts, &req->r_stamp);
2411 ceph_encode_copy(&p, &ts, sizeof(ts));
2412 }
2413
2414 BUG_ON(p > end);
2415 msg->front.iov_len = p - msg->front.iov_base;
2416 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
2417
2418 if (req->r_pagelist) {
2419 struct ceph_pagelist *pagelist = req->r_pagelist;
2420 ceph_msg_data_add_pagelist(msg, pagelist);
2421 msg->hdr.data_len = cpu_to_le32(pagelist->length);
2422 } else {
2423 msg->hdr.data_len = 0;
2424 }
2425
2426 msg->hdr.data_off = cpu_to_le16(0);
2427
2428 out_free2:
2429 if (freepath2)
2430 ceph_mdsc_free_path((char *)path2, pathlen2);
2431 out_free1:
2432 if (freepath1)
2433 ceph_mdsc_free_path((char *)path1, pathlen1);
2434 out:
2435 return msg;
2436 }
2437
2438 /*
2439 * called under mdsc->mutex if error, under no mutex if
2440 * success.
2441 */
2442 static void complete_request(struct ceph_mds_client *mdsc,
2443 struct ceph_mds_request *req)
2444 {
2445 if (req->r_callback)
2446 req->r_callback(mdsc, req);
2447 complete_all(&req->r_completion);
2448 }
2449
2450 /*
2451 * called under mdsc->mutex
2452 */
2453 static int __prepare_send_request(struct ceph_mds_client *mdsc,
2454 struct ceph_mds_request *req,
2455 int mds, bool drop_cap_releases)
2456 {
2457 struct ceph_mds_request_head *rhead;
2458 struct ceph_msg *msg;
2459 int flags = 0;
2460
2461 req->r_attempts++;
2462 if (req->r_inode) {
2463 struct ceph_cap *cap =
2464 ceph_get_cap_for_mds(ceph_inode(req->r_inode), mds);
2465
2466 if (cap)
2467 req->r_sent_on_mseq = cap->mseq;
2468 else
2469 req->r_sent_on_mseq = -1;
2470 }
2471 dout("prepare_send_request %p tid %lld %s (attempt %d)\n", req,
2472 req->r_tid, ceph_mds_op_name(req->r_op), req->r_attempts);
2473
2474 if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) {
2475 void *p;
2476 /*
2477 * Replay. Do not regenerate message (and rebuild
2478 * paths, etc.); just use the original message.
2479 * Rebuilding paths will break for renames because
2480 * d_move mangles the src name.
2481 */
2482 msg = req->r_request;
2483 rhead = msg->front.iov_base;
2484
2485 flags = le32_to_cpu(rhead->flags);
2486 flags |= CEPH_MDS_FLAG_REPLAY;
2487 rhead->flags = cpu_to_le32(flags);
2488
2489 if (req->r_target_inode)
2490 rhead->ino = cpu_to_le64(ceph_ino(req->r_target_inode));
2491
2492 rhead->num_retry = req->r_attempts - 1;
2493
2494 /* remove cap/dentry releases from message */
2495 rhead->num_releases = 0;
2496
2497 /* time stamp */
2498 p = msg->front.iov_base + req->r_request_release_offset;
2499 {
2500 struct ceph_timespec ts;
2501 ceph_encode_timespec64(&ts, &req->r_stamp);
2502 ceph_encode_copy(&p, &ts, sizeof(ts));
2503 }
2504
2505 msg->front.iov_len = p - msg->front.iov_base;
2506 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
2507 return 0;
2508 }
2509
2510 if (req->r_request) {
2511 ceph_msg_put(req->r_request);
2512 req->r_request = NULL;
2513 }
2514 msg = create_request_message(mdsc, req, mds, drop_cap_releases);
2515 if (IS_ERR(msg)) {
2516 req->r_err = PTR_ERR(msg);
2517 return PTR_ERR(msg);
2518 }
2519 req->r_request = msg;
2520
2521 rhead = msg->front.iov_base;
2522 rhead->oldest_client_tid = cpu_to_le64(__get_oldest_tid(mdsc));
2523 if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags))
2524 flags |= CEPH_MDS_FLAG_REPLAY;
2525 if (req->r_parent)
2526 flags |= CEPH_MDS_FLAG_WANT_DENTRY;
2527 rhead->flags = cpu_to_le32(flags);
2528 rhead->num_fwd = req->r_num_fwd;
2529 rhead->num_retry = req->r_attempts - 1;
2530 rhead->ino = 0;
2531
2532 dout(" r_parent = %p\n", req->r_parent);
2533 return 0;
2534 }
2535
2536 /*
2537 * called under mdsc->mutex
2538 */
2539 static int __send_request(struct ceph_mds_client *mdsc,
2540 struct ceph_mds_session *session,
2541 struct ceph_mds_request *req,
2542 bool drop_cap_releases)
2543 {
2544 int err;
2545
2546 err = __prepare_send_request(mdsc, req, session->s_mds,
2547 drop_cap_releases);
2548 if (!err) {
2549 ceph_msg_get(req->r_request);
2550 ceph_con_send(&session->s_con, req->r_request);
2551 }
2552
2553 return err;
2554 }
2555
2556 /*
2557 * send request, or put it on the appropriate wait list.
2558 */
2559 static void __do_request(struct ceph_mds_client *mdsc,
2560 struct ceph_mds_request *req)
2561 {
2562 struct ceph_mds_session *session = NULL;
2563 int mds = -1;
2564 int err = 0;
2565 bool random;
2566
2567 if (req->r_err || test_bit(CEPH_MDS_R_GOT_RESULT, &req->r_req_flags)) {
2568 if (test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags))
2569 __unregister_request(mdsc, req);
2570 return;
2571 }
2572
2573 if (req->r_timeout &&
2574 time_after_eq(jiffies, req->r_started + req->r_timeout)) {
2575 dout("do_request timed out\n");
2576 err = -EIO;
2577 goto finish;
2578 }
2579 if (READ_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_SHUTDOWN) {
2580 dout("do_request forced umount\n");
2581 err = -EIO;
2582 goto finish;
2583 }
2584 if (READ_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_MOUNTING) {
2585 if (mdsc->mdsmap_err) {
2586 err = mdsc->mdsmap_err;
2587 dout("do_request mdsmap err %d\n", err);
2588 goto finish;
2589 }
2590 if (mdsc->mdsmap->m_epoch == 0) {
2591 dout("do_request no mdsmap, waiting for map\n");
2592 list_add(&req->r_wait, &mdsc->waiting_for_map);
2593 return;
2594 }
2595 if (!(mdsc->fsc->mount_options->flags &
2596 CEPH_MOUNT_OPT_MOUNTWAIT) &&
2597 !ceph_mdsmap_is_cluster_available(mdsc->mdsmap)) {
2598 err = -EHOSTUNREACH;
2599 goto finish;
2600 }
2601 }
2602
2603 put_request_session(req);
2604
2605 mds = __choose_mds(mdsc, req, &random);
2606 if (mds < 0 ||
2607 ceph_mdsmap_get_state(mdsc->mdsmap, mds) < CEPH_MDS_STATE_ACTIVE) {
2608 dout("do_request no mds or not active, waiting for map\n");
2609 list_add(&req->r_wait, &mdsc->waiting_for_map);
2610 return;
2611 }
2612
2613 /* get, open session */
2614 session = __ceph_lookup_mds_session(mdsc, mds);
2615 if (!session) {
2616 session = register_session(mdsc, mds);
2617 if (IS_ERR(session)) {
2618 err = PTR_ERR(session);
2619 goto finish;
2620 }
2621 }
2622 req->r_session = ceph_get_mds_session(session);
2623
2624 dout("do_request mds%d session %p state %s\n", mds, session,
2625 ceph_session_state_name(session->s_state));
2626 if (session->s_state != CEPH_MDS_SESSION_OPEN &&
2627 session->s_state != CEPH_MDS_SESSION_HUNG) {
2628 if (session->s_state == CEPH_MDS_SESSION_REJECTED) {
2629 err = -EACCES;
2630 goto out_session;
2631 }
2632 if (session->s_state == CEPH_MDS_SESSION_NEW ||
2633 session->s_state == CEPH_MDS_SESSION_CLOSING) {
2634 __open_session(mdsc, session);
2635 /* retry the same mds later */
2636 if (random)
2637 req->r_resend_mds = mds;
2638 }
2639 list_add(&req->r_wait, &session->s_waiting);
2640 goto out_session;
2641 }
2642
2643 /* send request */
2644 req->r_resend_mds = -1; /* forget any previous mds hint */
2645
2646 if (req->r_request_started == 0) /* note request start time */
2647 req->r_request_started = jiffies;
2648
2649 err = __send_request(mdsc, session, req, false);
2650
2651 out_session:
2652 ceph_put_mds_session(session);
2653 finish:
2654 if (err) {
2655 dout("__do_request early error %d\n", err);
2656 req->r_err = err;
2657 complete_request(mdsc, req);
2658 __unregister_request(mdsc, req);
2659 }
2660 return;
2661 }
2662
2663 /*
2664 * called under mdsc->mutex
2665 */
2666 static void __wake_requests(struct ceph_mds_client *mdsc,
2667 struct list_head *head)
2668 {
2669 struct ceph_mds_request *req;
2670 LIST_HEAD(tmp_list);
2671
2672 list_splice_init(head, &tmp_list);
2673
2674 while (!list_empty(&tmp_list)) {
2675 req = list_entry(tmp_list.next,
2676 struct ceph_mds_request, r_wait);
2677 list_del_init(&req->r_wait);
2678 dout(" wake request %p tid %llu\n", req, req->r_tid);
2679 __do_request(mdsc, req);
2680 }
2681 }
2682
2683 /*
2684 * Wake up threads with requests pending for @mds, so that they can
2685 * resubmit their requests to a possibly different mds.
2686 */
2687 static void kick_requests(struct ceph_mds_client *mdsc, int mds)
2688 {
2689 struct ceph_mds_request *req;
2690 struct rb_node *p = rb_first(&mdsc->request_tree);
2691
2692 dout("kick_requests mds%d\n", mds);
2693 while (p) {
2694 req = rb_entry(p, struct ceph_mds_request, r_node);
2695 p = rb_next(p);
2696 if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags))
2697 continue;
2698 if (req->r_attempts > 0)
2699 continue; /* only new requests */
2700 if (req->r_session &&
2701 req->r_session->s_mds == mds) {
2702 dout(" kicking tid %llu\n", req->r_tid);
2703 list_del_init(&req->r_wait);
2704 __do_request(mdsc, req);
2705 }
2706 }
2707 }
2708
2709 int ceph_mdsc_submit_request(struct ceph_mds_client *mdsc, struct inode *dir,
2710 struct ceph_mds_request *req)
2711 {
2712 int err;
2713
2714 /* take CAP_PIN refs for r_inode, r_parent, r_old_dentry */
2715 if (req->r_inode)
2716 ceph_get_cap_refs(ceph_inode(req->r_inode), CEPH_CAP_PIN);
2717 if (req->r_parent) {
2718 ceph_get_cap_refs(ceph_inode(req->r_parent), CEPH_CAP_PIN);
2719 ihold(req->r_parent);
2720 }
2721 if (req->r_old_dentry_dir)
2722 ceph_get_cap_refs(ceph_inode(req->r_old_dentry_dir),
2723 CEPH_CAP_PIN);
2724
2725 dout("submit_request on %p for inode %p\n", req, dir);
2726 mutex_lock(&mdsc->mutex);
2727 __register_request(mdsc, req, dir);
2728 __do_request(mdsc, req);
2729 err = req->r_err;
2730 mutex_unlock(&mdsc->mutex);
2731 return err;
2732 }
2733
2734 static int ceph_mdsc_wait_request(struct ceph_mds_client *mdsc,
2735 struct ceph_mds_request *req)
2736 {
2737 int err;
2738
2739 /* wait */
2740 dout("do_request waiting\n");
2741 if (!req->r_timeout && req->r_wait_for_completion) {
2742 err = req->r_wait_for_completion(mdsc, req);
2743 } else {
2744 long timeleft = wait_for_completion_killable_timeout(
2745 &req->r_completion,
2746 ceph_timeout_jiffies(req->r_timeout));
2747 if (timeleft > 0)
2748 err = 0;
2749 else if (!timeleft)
2750 err = -EIO; /* timed out */
2751 else
2752 err = timeleft; /* killed */
2753 }
2754 dout("do_request waited, got %d\n", err);
2755 mutex_lock(&mdsc->mutex);
2756
2757 /* only abort if we didn't race with a real reply */
2758 if (test_bit(CEPH_MDS_R_GOT_RESULT, &req->r_req_flags)) {
2759 err = le32_to_cpu(req->r_reply_info.head->result);
2760 } else if (err < 0) {
2761 dout("aborted request %lld with %d\n", req->r_tid, err);
2762
2763 /*
2764 * ensure we aren't running concurrently with
2765 * ceph_fill_trace or ceph_readdir_prepopulate, which
2766 * rely on locks (dir mutex) held by our caller.
2767 */
2768 mutex_lock(&req->r_fill_mutex);
2769 req->r_err = err;
2770 set_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags);
2771 mutex_unlock(&req->r_fill_mutex);
2772
2773 if (req->r_parent &&
2774 (req->r_op & CEPH_MDS_OP_WRITE))
2775 ceph_invalidate_dir_request(req);
2776 } else {
2777 err = req->r_err;
2778 }
2779
2780 mutex_unlock(&mdsc->mutex);
2781 return err;
2782 }
2783
2784 /*
2785 * Synchrously perform an mds request. Take care of all of the
2786 * session setup, forwarding, retry details.
2787 */
2788 int ceph_mdsc_do_request(struct ceph_mds_client *mdsc,
2789 struct inode *dir,
2790 struct ceph_mds_request *req)
2791 {
2792 int err;
2793
2794 dout("do_request on %p\n", req);
2795
2796 /* issue */
2797 err = ceph_mdsc_submit_request(mdsc, dir, req);
2798 if (!err)
2799 err = ceph_mdsc_wait_request(mdsc, req);
2800 dout("do_request %p done, result %d\n", req, err);
2801 return err;
2802 }
2803
2804 /*
2805 * Invalidate dir's completeness, dentry lease state on an aborted MDS
2806 * namespace request.
2807 */
2808 void ceph_invalidate_dir_request(struct ceph_mds_request *req)
2809 {
2810 struct inode *dir = req->r_parent;
2811 struct inode *old_dir = req->r_old_dentry_dir;
2812
2813 dout("invalidate_dir_request %p %p (complete, lease(s))\n", dir, old_dir);
2814
2815 ceph_dir_clear_complete(dir);
2816 if (old_dir)
2817 ceph_dir_clear_complete(old_dir);
2818 if (req->r_dentry)
2819 ceph_invalidate_dentry_lease(req->r_dentry);
2820 if (req->r_old_dentry)
2821 ceph_invalidate_dentry_lease(req->r_old_dentry);
2822 }
2823
2824 /*
2825 * Handle mds reply.
2826 *
2827 * We take the session mutex and parse and process the reply immediately.
2828 * This preserves the logical ordering of replies, capabilities, etc., sent
2829 * by the MDS as they are applied to our local cache.
2830 */
2831 static void handle_reply(struct ceph_mds_session *session, struct ceph_msg *msg)
2832 {
2833 struct ceph_mds_client *mdsc = session->s_mdsc;
2834 struct ceph_mds_request *req;
2835 struct ceph_mds_reply_head *head = msg->front.iov_base;
2836 struct ceph_mds_reply_info_parsed *rinfo; /* parsed reply info */
2837 struct ceph_snap_realm *realm;
2838 u64 tid;
2839 int err, result;
2840 int mds = session->s_mds;
2841
2842 if (msg->front.iov_len < sizeof(*head)) {
2843 pr_err("mdsc_handle_reply got corrupt (short) reply\n");
2844 ceph_msg_dump(msg);
2845 return;
2846 }
2847
2848 /* get request, session */
2849 tid = le64_to_cpu(msg->hdr.tid);
2850 mutex_lock(&mdsc->mutex);
2851 req = lookup_get_request(mdsc, tid);
2852 if (!req) {
2853 dout("handle_reply on unknown tid %llu\n", tid);
2854 mutex_unlock(&mdsc->mutex);
2855 return;
2856 }
2857 dout("handle_reply %p\n", req);
2858
2859 /* correct session? */
2860 if (req->r_session != session) {
2861 pr_err("mdsc_handle_reply got %llu on session mds%d"
2862 " not mds%d\n", tid, session->s_mds,
2863 req->r_session ? req->r_session->s_mds : -1);
2864 mutex_unlock(&mdsc->mutex);
2865 goto out;
2866 }
2867
2868 /* dup? */
2869 if ((test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags) && !head->safe) ||
2870 (test_bit(CEPH_MDS_R_GOT_SAFE, &req->r_req_flags) && head->safe)) {
2871 pr_warn("got a dup %s reply on %llu from mds%d\n",
2872 head->safe ? "safe" : "unsafe", tid, mds);
2873 mutex_unlock(&mdsc->mutex);
2874 goto out;
2875 }
2876 if (test_bit(CEPH_MDS_R_GOT_SAFE, &req->r_req_flags)) {
2877 pr_warn("got unsafe after safe on %llu from mds%d\n",
2878 tid, mds);
2879 mutex_unlock(&mdsc->mutex);
2880 goto out;
2881 }
2882
2883 result = le32_to_cpu(head->result);
2884
2885 /*
2886 * Handle an ESTALE
2887 * if we're not talking to the authority, send to them
2888 * if the authority has changed while we weren't looking,
2889 * send to new authority
2890 * Otherwise we just have to return an ESTALE
2891 */
2892 if (result == -ESTALE) {
2893 dout("got ESTALE on request %llu\n", req->r_tid);
2894 req->r_resend_mds = -1;
2895 if (req->r_direct_mode != USE_AUTH_MDS) {
2896 dout("not using auth, setting for that now\n");
2897 req->r_direct_mode = USE_AUTH_MDS;
2898 __do_request(mdsc, req);
2899 mutex_unlock(&mdsc->mutex);
2900 goto out;
2901 } else {
2902 int mds = __choose_mds(mdsc, req, NULL);
2903 if (mds >= 0 && mds != req->r_session->s_mds) {
2904 dout("but auth changed, so resending\n");
2905 __do_request(mdsc, req);
2906 mutex_unlock(&mdsc->mutex);
2907 goto out;
2908 }
2909 }
2910 dout("have to return ESTALE on request %llu\n", req->r_tid);
2911 }
2912
2913
2914 if (head->safe) {
2915 set_bit(CEPH_MDS_R_GOT_SAFE, &req->r_req_flags);
2916 __unregister_request(mdsc, req);
2917
2918 /* last request during umount? */
2919 if (mdsc->stopping && !__get_oldest_req(mdsc))
2920 complete_all(&mdsc->safe_umount_waiters);
2921
2922 if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) {
2923 /*
2924 * We already handled the unsafe response, now do the
2925 * cleanup. No need to examine the response; the MDS
2926 * doesn't include any result info in the safe
2927 * response. And even if it did, there is nothing
2928 * useful we could do with a revised return value.
2929 */
2930 dout("got safe reply %llu, mds%d\n", tid, mds);
2931
2932 mutex_unlock(&mdsc->mutex);
2933 goto out;
2934 }
2935 } else {
2936 set_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags);
2937 list_add_tail(&req->r_unsafe_item, &req->r_session->s_unsafe);
2938 if (req->r_unsafe_dir) {
2939 struct ceph_inode_info *ci =
2940 ceph_inode(req->r_unsafe_dir);
2941 spin_lock(&ci->i_unsafe_lock);
2942 list_add_tail(&req->r_unsafe_dir_item,
2943 &ci->i_unsafe_dirops);
2944 spin_unlock(&ci->i_unsafe_lock);
2945 }
2946 }
2947
2948 dout("handle_reply tid %lld result %d\n", tid, result);
2949 rinfo = &req->r_reply_info;
2950 if (test_bit(CEPHFS_FEATURE_REPLY_ENCODING, &session->s_features))
2951 err = parse_reply_info(msg, rinfo, (u64)-1);
2952 else
2953 err = parse_reply_info(msg, rinfo, session->s_con.peer_features);
2954 mutex_unlock(&mdsc->mutex);
2955
2956 mutex_lock(&session->s_mutex);
2957 if (err < 0) {
2958 pr_err("mdsc_handle_reply got corrupt reply mds%d(tid:%lld)\n", mds, tid);
2959 ceph_msg_dump(msg);
2960 goto out_err;
2961 }
2962
2963 /* snap trace */
2964 realm = NULL;
2965 if (rinfo->snapblob_len) {
2966 down_write(&mdsc->snap_rwsem);
2967 ceph_update_snap_trace(mdsc, rinfo->snapblob,
2968 rinfo->snapblob + rinfo->snapblob_len,
2969 le32_to_cpu(head->op) == CEPH_MDS_OP_RMSNAP,
2970 &realm);
2971 downgrade_write(&mdsc->snap_rwsem);
2972 } else {
2973 down_read(&mdsc->snap_rwsem);
2974 }
2975
2976 /* insert trace into our cache */
2977 mutex_lock(&req->r_fill_mutex);
2978 current->journal_info = req;
2979 err = ceph_fill_trace(mdsc->fsc->sb, req);
2980 if (err == 0) {
2981 if (result == 0 && (req->r_op == CEPH_MDS_OP_READDIR ||
2982 req->r_op == CEPH_MDS_OP_LSSNAP))
2983 ceph_readdir_prepopulate(req, req->r_session);
2984 }
2985 current->journal_info = NULL;
2986 mutex_unlock(&req->r_fill_mutex);
2987
2988 up_read(&mdsc->snap_rwsem);
2989 if (realm)
2990 ceph_put_snap_realm(mdsc, realm);
2991
2992 if (err == 0) {
2993 if (req->r_target_inode &&
2994 test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) {
2995 struct ceph_inode_info *ci =
2996 ceph_inode(req->r_target_inode);
2997 spin_lock(&ci->i_unsafe_lock);
2998 list_add_tail(&req->r_unsafe_target_item,
2999 &ci->i_unsafe_iops);
3000 spin_unlock(&ci->i_unsafe_lock);
3001 }
3002
3003 ceph_unreserve_caps(mdsc, &req->r_caps_reservation);
3004 }
3005 out_err:
3006 mutex_lock(&mdsc->mutex);
3007 if (!test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags)) {
3008 if (err) {
3009 req->r_err = err;
3010 } else {
3011 req->r_reply = ceph_msg_get(msg);
3012 set_bit(CEPH_MDS_R_GOT_RESULT, &req->r_req_flags);
3013 }
3014 } else {
3015 dout("reply arrived after request %lld was aborted\n", tid);
3016 }
3017 mutex_unlock(&mdsc->mutex);
3018
3019 mutex_unlock(&session->s_mutex);
3020
3021 /* kick calling process */
3022 complete_request(mdsc, req);
3023 out:
3024 ceph_mdsc_put_request(req);
3025 return;
3026 }
3027
3028
3029
3030 /*
3031 * handle mds notification that our request has been forwarded.
3032 */
3033 static void handle_forward(struct ceph_mds_client *mdsc,
3034 struct ceph_mds_session *session,
3035 struct ceph_msg *msg)
3036 {
3037 struct ceph_mds_request *req;
3038 u64 tid = le64_to_cpu(msg->hdr.tid);
3039 u32 next_mds;
3040 u32 fwd_seq;
3041 int err = -EINVAL;
3042 void *p = msg->front.iov_base;
3043 void *end = p + msg->front.iov_len;
3044
3045 ceph_decode_need(&p, end, 2*sizeof(u32), bad);
3046 next_mds = ceph_decode_32(&p);
3047 fwd_seq = ceph_decode_32(&p);
3048
3049 mutex_lock(&mdsc->mutex);
3050 req = lookup_get_request(mdsc, tid);
3051 if (!req) {
3052 dout("forward tid %llu to mds%d - req dne\n", tid, next_mds);
3053 goto out; /* dup reply? */
3054 }
3055
3056 if (test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags)) {
3057 dout("forward tid %llu aborted, unregistering\n", tid);
3058 __unregister_request(mdsc, req);
3059 } else if (fwd_seq <= req->r_num_fwd) {
3060 dout("forward tid %llu to mds%d - old seq %d <= %d\n",
3061 tid, next_mds, req->r_num_fwd, fwd_seq);
3062 } else {
3063 /* resend. forward race not possible; mds would drop */
3064 dout("forward tid %llu to mds%d (we resend)\n", tid, next_mds);
3065 BUG_ON(req->r_err);
3066 BUG_ON(test_bit(CEPH_MDS_R_GOT_RESULT, &req->r_req_flags));
3067 req->r_attempts = 0;
3068 req->r_num_fwd = fwd_seq;
3069 req->r_resend_mds = next_mds;
3070 put_request_session(req);
3071 __do_request(mdsc, req);
3072 }
3073 ceph_mdsc_put_request(req);
3074 out:
3075 mutex_unlock(&mdsc->mutex);
3076 return;
3077
3078 bad:
3079 pr_err("mdsc_handle_forward decode error err=%d\n", err);
3080 }
3081
3082 static int __decode_session_metadata(void **p, void *end,
3083 bool *blacklisted)
3084 {
3085 /* map<string,string> */
3086 u32 n;
3087 bool err_str;
3088 ceph_decode_32_safe(p, end, n, bad);
3089 while (n-- > 0) {
3090 u32 len;
3091 ceph_decode_32_safe(p, end, len, bad);
3092 ceph_decode_need(p, end, len, bad);
3093 err_str = !strncmp(*p, "error_string", len);
3094 *p += len;
3095 ceph_decode_32_safe(p, end, len, bad);
3096 ceph_decode_need(p, end, len, bad);
3097 if (err_str && strnstr(*p, "blacklisted", len))
3098 *blacklisted = true;
3099 *p += len;
3100 }
3101 return 0;
3102 bad:
3103 return -1;
3104 }
3105
3106 /*
3107 * handle a mds session control message
3108 */
3109 static void handle_session(struct ceph_mds_session *session,
3110 struct ceph_msg *msg)
3111 {
3112 struct ceph_mds_client *mdsc = session->s_mdsc;
3113 int mds = session->s_mds;
3114 int msg_version = le16_to_cpu(msg->hdr.version);
3115 void *p = msg->front.iov_base;
3116 void *end = p + msg->front.iov_len;
3117 struct ceph_mds_session_head *h;
3118 u32 op;
3119 u64 seq;
3120 unsigned long features = 0;
3121 int wake = 0;
3122 bool blacklisted = false;
3123
3124 /* decode */
3125 ceph_decode_need(&p, end, sizeof(*h), bad);
3126 h = p;
3127 p += sizeof(*h);
3128
3129 op = le32_to_cpu(h->op);
3130 seq = le64_to_cpu(h->seq);
3131
3132 if (msg_version >= 3) {
3133 u32 len;
3134 /* version >= 2, metadata */
3135 if (__decode_session_metadata(&p, end, &blacklisted) < 0)
3136 goto bad;
3137 /* version >= 3, feature bits */
3138 ceph_decode_32_safe(&p, end, len, bad);
3139 ceph_decode_need(&p, end, len, bad);
3140 memcpy(&features, p, min_t(size_t, len, sizeof(features)));
3141 p += len;
3142 }
3143
3144 mutex_lock(&mdsc->mutex);
3145 if (op == CEPH_SESSION_CLOSE) {
3146 ceph_get_mds_session(session);
3147 __unregister_session(mdsc, session);
3148 }
3149 /* FIXME: this ttl calculation is generous */
3150 session->s_ttl = jiffies + HZ*mdsc->mdsmap->m_session_autoclose;
3151 mutex_unlock(&mdsc->mutex);
3152
3153 mutex_lock(&session->s_mutex);
3154
3155 dout("handle_session mds%d %s %p state %s seq %llu\n",
3156 mds, ceph_session_op_name(op), session,
3157 ceph_session_state_name(session->s_state), seq);
3158
3159 if (session->s_state == CEPH_MDS_SESSION_HUNG) {
3160 session->s_state = CEPH_MDS_SESSION_OPEN;
3161 pr_info("mds%d came back\n", session->s_mds);
3162 }
3163
3164 switch (op) {
3165 case CEPH_SESSION_OPEN:
3166 if (session->s_state == CEPH_MDS_SESSION_RECONNECTING)
3167 pr_info("mds%d reconnect success\n", session->s_mds);
3168 session->s_state = CEPH_MDS_SESSION_OPEN;
3169 session->s_features = features;
3170 renewed_caps(mdsc, session, 0);
3171 wake = 1;
3172 if (mdsc->stopping)
3173 __close_session(mdsc, session);
3174 break;
3175
3176 case CEPH_SESSION_RENEWCAPS:
3177 if (session->s_renew_seq == seq)
3178 renewed_caps(mdsc, session, 1);
3179 break;
3180
3181 case CEPH_SESSION_CLOSE:
3182 if (session->s_state == CEPH_MDS_SESSION_RECONNECTING)
3183 pr_info("mds%d reconnect denied\n", session->s_mds);
3184 session->s_state = CEPH_MDS_SESSION_CLOSED;
3185 cleanup_session_requests(mdsc, session);
3186 remove_session_caps(session);
3187 wake = 2; /* for good measure */
3188 wake_up_all(&mdsc->session_close_wq);
3189 break;
3190
3191 case CEPH_SESSION_STALE:
3192 pr_info("mds%d caps went stale, renewing\n",
3193 session->s_mds);
3194 spin_lock(&session->s_gen_ttl_lock);
3195 session->s_cap_gen++;
3196 session->s_cap_ttl = jiffies - 1;
3197 spin_unlock(&session->s_gen_ttl_lock);
3198 send_renew_caps(mdsc, session);
3199 break;
3200
3201 case CEPH_SESSION_RECALL_STATE:
3202 ceph_trim_caps(mdsc, session, le32_to_cpu(h->max_caps));
3203 break;
3204
3205 case CEPH_SESSION_FLUSHMSG:
3206 send_flushmsg_ack(mdsc, session, seq);
3207 break;
3208
3209 case CEPH_SESSION_FORCE_RO:
3210 dout("force_session_readonly %p\n", session);
3211 spin_lock(&session->s_cap_lock);
3212 session->s_readonly = true;
3213 spin_unlock(&session->s_cap_lock);
3214 wake_up_session_caps(session, FORCE_RO);
3215 break;
3216
3217 case CEPH_SESSION_REJECT:
3218 WARN_ON(session->s_state != CEPH_MDS_SESSION_OPENING);
3219 pr_info("mds%d rejected session\n", session->s_mds);
3220 session->s_state = CEPH_MDS_SESSION_REJECTED;
3221 cleanup_session_requests(mdsc, session);
3222 remove_session_caps(session);
3223 if (blacklisted)
3224 mdsc->fsc->blacklisted = true;
3225 wake = 2; /* for good measure */
3226 break;
3227
3228 default:
3229 pr_err("mdsc_handle_session bad op %d mds%d\n", op, mds);
3230 WARN_ON(1);
3231 }
3232
3233 mutex_unlock(&session->s_mutex);
3234 if (wake) {
3235 mutex_lock(&mdsc->mutex);
3236 __wake_requests(mdsc, &session->s_waiting);
3237 if (wake == 2)
3238 kick_requests(mdsc, mds);
3239 mutex_unlock(&mdsc->mutex);
3240 }
3241 if (op == CEPH_SESSION_CLOSE)
3242 ceph_put_mds_session(session);
3243 return;
3244
3245 bad:
3246 pr_err("mdsc_handle_session corrupt message mds%d len %d\n", mds,
3247 (int)msg->front.iov_len);
3248 ceph_msg_dump(msg);
3249 return;
3250 }
3251
3252 /*
3253 * called under session->mutex.
3254 */
3255 static void replay_unsafe_requests(struct ceph_mds_client *mdsc,
3256 struct ceph_mds_session *session)
3257 {
3258 struct ceph_mds_request *req, *nreq;
3259 struct rb_node *p;
3260
3261 dout("replay_unsafe_requests mds%d\n", session->s_mds);
3262
3263 mutex_lock(&mdsc->mutex);
3264 list_for_each_entry_safe(req, nreq, &session->s_unsafe, r_unsafe_item)
3265 __send_request(mdsc, session, req, true);
3266
3267 /*
3268 * also re-send old requests when MDS enters reconnect stage. So that MDS
3269 * can process completed request in clientreplay stage.
3270 */
3271 p = rb_first(&mdsc->request_tree);
3272 while (p) {
3273 req = rb_entry(p, struct ceph_mds_request, r_node);
3274 p = rb_next(p);
3275 if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags))
3276 continue;
3277 if (req->r_attempts == 0)
3278 continue; /* only old requests */
3279 if (req->r_session &&
3280 req->r_session->s_mds == session->s_mds)
3281 __send_request(mdsc, session, req, true);
3282 }
3283 mutex_unlock(&mdsc->mutex);
3284 }
3285
3286 static int send_reconnect_partial(struct ceph_reconnect_state *recon_state)
3287 {
3288 struct ceph_msg *reply;
3289 struct ceph_pagelist *_pagelist;
3290 struct page *page;
3291 __le32 *addr;
3292 int err = -ENOMEM;
3293
3294 if (!recon_state->allow_multi)
3295 return -ENOSPC;
3296
3297 /* can't handle message that contains both caps and realm */
3298 BUG_ON(!recon_state->nr_caps == !recon_state->nr_realms);
3299
3300 /* pre-allocate new pagelist */
3301 _pagelist = ceph_pagelist_alloc(GFP_NOFS);
3302 if (!_pagelist)
3303 return -ENOMEM;
3304
3305 reply = ceph_msg_new2(CEPH_MSG_CLIENT_RECONNECT, 0, 1, GFP_NOFS, false);
3306 if (!reply)
3307 goto fail_msg;
3308
3309 /* placeholder for nr_caps */
3310 err = ceph_pagelist_encode_32(_pagelist, 0);
3311 if (err < 0)
3312 goto fail;
3313
3314 if (recon_state->nr_caps) {
3315 /* currently encoding caps */
3316 err = ceph_pagelist_encode_32(recon_state->pagelist, 0);
3317 if (err)
3318 goto fail;
3319 } else {
3320 /* placeholder for nr_realms (currently encoding relams) */
3321 err = ceph_pagelist_encode_32(_pagelist, 0);
3322 if (err < 0)
3323 goto fail;
3324 }
3325
3326 err = ceph_pagelist_encode_8(recon_state->pagelist, 1);
3327 if (err)
3328 goto fail;
3329
3330 page = list_first_entry(&recon_state->pagelist->head, struct page, lru);
3331 addr = kmap_atomic(page);
3332 if (recon_state->nr_caps) {
3333 /* currently encoding caps */
3334 *addr = cpu_to_le32(recon_state->nr_caps);
3335 } else {
3336 /* currently encoding relams */
3337 *(addr + 1) = cpu_to_le32(recon_state->nr_realms);
3338 }
3339 kunmap_atomic(addr);
3340
3341 reply->hdr.version = cpu_to_le16(5);
3342 reply->hdr.compat_version = cpu_to_le16(4);
3343
3344 reply->hdr.data_len = cpu_to_le32(recon_state->pagelist->length);
3345 ceph_msg_data_add_pagelist(reply, recon_state->pagelist);
3346
3347 ceph_con_send(&recon_state->session->s_con, reply);
3348 ceph_pagelist_release(recon_state->pagelist);
3349
3350 recon_state->pagelist = _pagelist;
3351 recon_state->nr_caps = 0;
3352 recon_state->nr_realms = 0;
3353 recon_state->msg_version = 5;
3354 return 0;
3355 fail:
3356 ceph_msg_put(reply);
3357 fail_msg:
3358 ceph_pagelist_release(_pagelist);
3359 return err;
3360 }
3361
3362 /*
3363 * Encode information about a cap for a reconnect with the MDS.
3364 */
3365 static int encode_caps_cb(struct inode *inode, struct ceph_cap *cap,
3366 void *arg)
3367 {
3368 union {
3369 struct ceph_mds_cap_reconnect v2;
3370 struct ceph_mds_cap_reconnect_v1 v1;
3371 } rec;
3372 struct ceph_inode_info *ci = cap->ci;
3373 struct ceph_reconnect_state *recon_state = arg;
3374 struct ceph_pagelist *pagelist = recon_state->pagelist;
3375 int err;
3376 u64 snap_follows;
3377
3378 dout(" adding %p ino %llx.%llx cap %p %lld %s\n",
3379 inode, ceph_vinop(inode), cap, cap->cap_id,
3380 ceph_cap_string(cap->issued));
3381
3382 spin_lock(&ci->i_ceph_lock);
3383 cap->seq = 0; /* reset cap seq */
3384 cap->issue_seq = 0; /* and issue_seq */
3385 cap->mseq = 0; /* and migrate_seq */
3386 cap->cap_gen = cap->session->s_cap_gen;
3387
3388 if (recon_state->msg_version >= 2) {
3389 rec.v2.cap_id = cpu_to_le64(cap->cap_id);
3390 rec.v2.wanted = cpu_to_le32(__ceph_caps_wanted(ci));
3391 rec.v2.issued = cpu_to_le32(cap->issued);
3392 rec.v2.snaprealm = cpu_to_le64(ci->i_snap_realm->ino);
3393 rec.v2.pathbase = 0;
3394 rec.v2.flock_len = (__force __le32)
3395 ((ci->i_ceph_flags & CEPH_I_ERROR_FILELOCK) ? 0 : 1);
3396 } else {
3397 rec.v1.cap_id = cpu_to_le64(cap->cap_id);
3398 rec.v1.wanted = cpu_to_le32(__ceph_caps_wanted(ci));
3399 rec.v1.issued = cpu_to_le32(cap->issued);
3400 rec.v1.size = cpu_to_le64(inode->i_size);
3401 ceph_encode_timespec64(&rec.v1.mtime, &inode->i_mtime);
3402 ceph_encode_timespec64(&rec.v1.atime, &inode->i_atime);
3403 rec.v1.snaprealm = cpu_to_le64(ci->i_snap_realm->ino);
3404 rec.v1.pathbase = 0;
3405 }
3406
3407 if (list_empty(&ci->i_cap_snaps)) {
3408 snap_follows = ci->i_head_snapc ? ci->i_head_snapc->seq : 0;
3409 } else {
3410 struct ceph_cap_snap *capsnap =
3411 list_first_entry(&ci->i_cap_snaps,
3412 struct ceph_cap_snap, ci_item);
3413 snap_follows = capsnap->follows;
3414 }
3415 spin_unlock(&ci->i_ceph_lock);
3416
3417 if (recon_state->msg_version >= 2) {
3418 int num_fcntl_locks, num_flock_locks;
3419 struct ceph_filelock *flocks = NULL;
3420 size_t struct_len, total_len = sizeof(u64);
3421 u8 struct_v = 0;
3422
3423 encode_again:
3424 if (rec.v2.flock_len) {
3425 ceph_count_locks(inode, &num_fcntl_locks, &num_flock_locks);
3426 } else {
3427 num_fcntl_locks = 0;
3428 num_flock_locks = 0;
3429 }
3430 if (num_fcntl_locks + num_flock_locks > 0) {
3431 flocks = kmalloc_array(num_fcntl_locks + num_flock_locks,
3432 sizeof(struct ceph_filelock),
3433 GFP_NOFS);
3434 if (!flocks) {
3435 err = -ENOMEM;
3436 goto out_err;
3437 }
3438 err = ceph_encode_locks_to_buffer(inode, flocks,
3439 num_fcntl_locks,
3440 num_flock_locks);
3441 if (err) {
3442 kfree(flocks);
3443 flocks = NULL;
3444 if (err == -ENOSPC)
3445 goto encode_again;
3446 goto out_err;
3447 }
3448 } else {
3449 kfree(flocks);
3450 flocks = NULL;
3451 }
3452
3453 if (recon_state->msg_version >= 3) {
3454 /* version, compat_version and struct_len */
3455 total_len += 2 * sizeof(u8) + sizeof(u32);
3456 struct_v = 2;
3457 }
3458 /*
3459 * number of encoded locks is stable, so copy to pagelist
3460 */
3461 struct_len = 2 * sizeof(u32) +
3462 (num_fcntl_locks + num_flock_locks) *
3463 sizeof(struct ceph_filelock);
3464 rec.v2.flock_len = cpu_to_le32(struct_len);
3465
3466 struct_len += sizeof(u32) + sizeof(rec.v2);
3467
3468 if (struct_v >= 2)
3469 struct_len += sizeof(u64); /* snap_follows */
3470
3471 total_len += struct_len;
3472
3473 if (pagelist->length + total_len > RECONNECT_MAX_SIZE) {
3474 err = send_reconnect_partial(recon_state);
3475 if (err)
3476 goto out_freeflocks;
3477 pagelist = recon_state->pagelist;
3478 }
3479
3480 err = ceph_pagelist_reserve(pagelist, total_len);
3481 if (err)
3482 goto out_freeflocks;
3483
3484 ceph_pagelist_encode_64(pagelist, ceph_ino(inode));
3485 if (recon_state->msg_version >= 3) {
3486 ceph_pagelist_encode_8(pagelist, struct_v);
3487 ceph_pagelist_encode_8(pagelist, 1);
3488 ceph_pagelist_encode_32(pagelist, struct_len);
3489 }
3490 ceph_pagelist_encode_string(pagelist, NULL, 0);
3491 ceph_pagelist_append(pagelist, &rec, sizeof(rec.v2));
3492 ceph_locks_to_pagelist(flocks, pagelist,
3493 num_fcntl_locks, num_flock_locks);
3494 if (struct_v >= 2)
3495 ceph_pagelist_encode_64(pagelist, snap_follows);
3496 out_freeflocks:
3497 kfree(flocks);
3498 } else {
3499 u64 pathbase = 0;
3500 int pathlen = 0;
3501 char *path = NULL;
3502 struct dentry *dentry;
3503
3504 dentry = d_find_alias(inode);
3505 if (dentry) {
3506 path = ceph_mdsc_build_path(dentry,
3507 &pathlen, &pathbase, 0);
3508 dput(dentry);
3509 if (IS_ERR(path)) {
3510 err = PTR_ERR(path);
3511 goto out_err;
3512 }
3513 rec.v1.pathbase = cpu_to_le64(pathbase);
3514 }
3515
3516 err = ceph_pagelist_reserve(pagelist,
3517 sizeof(u64) + sizeof(u32) +
3518 pathlen + sizeof(rec.v1));
3519 if (err) {
3520 goto out_freepath;
3521 }
3522
3523 ceph_pagelist_encode_64(pagelist, ceph_ino(inode));
3524 ceph_pagelist_encode_string(pagelist, path, pathlen);
3525 ceph_pagelist_append(pagelist, &rec, sizeof(rec.v1));
3526 out_freepath:
3527 ceph_mdsc_free_path(path, pathlen);
3528 }
3529
3530 out_err:
3531 if (err >= 0)
3532 recon_state->nr_caps++;
3533 return err;
3534 }
3535
3536 static int encode_snap_realms(struct ceph_mds_client *mdsc,
3537 struct ceph_reconnect_state *recon_state)
3538 {
3539 struct rb_node *p;
3540 struct ceph_pagelist *pagelist = recon_state->pagelist;
3541 int err = 0;
3542
3543 if (recon_state->msg_version >= 4) {
3544 err = ceph_pagelist_encode_32(pagelist, mdsc->num_snap_realms);
3545 if (err < 0)
3546 goto fail;
3547 }
3548
3549 /*
3550 * snaprealms. we provide mds with the ino, seq (version), and
3551 * parent for all of our realms. If the mds has any newer info,
3552 * it will tell us.
3553 */
3554 for (p = rb_first(&mdsc->snap_realms); p; p = rb_next(p)) {
3555 struct ceph_snap_realm *realm =
3556 rb_entry(p, struct ceph_snap_realm, node);
3557 struct ceph_mds_snaprealm_reconnect sr_rec;
3558
3559 if (recon_state->msg_version >= 4) {
3560 size_t need = sizeof(u8) * 2 + sizeof(u32) +
3561 sizeof(sr_rec);
3562
3563 if (pagelist->length + need > RECONNECT_MAX_SIZE) {
3564 err = send_reconnect_partial(recon_state);
3565 if (err)
3566 goto fail;
3567 pagelist = recon_state->pagelist;
3568 }
3569
3570 err = ceph_pagelist_reserve(pagelist, need);
3571 if (err)
3572 goto fail;
3573
3574 ceph_pagelist_encode_8(pagelist, 1);
3575 ceph_pagelist_encode_8(pagelist, 1);
3576 ceph_pagelist_encode_32(pagelist, sizeof(sr_rec));
3577 }
3578
3579 dout(" adding snap realm %llx seq %lld parent %llx\n",
3580 realm->ino, realm->seq, realm->parent_ino);
3581 sr_rec.ino = cpu_to_le64(realm->ino);
3582 sr_rec.seq = cpu_to_le64(realm->seq);
3583 sr_rec.parent = cpu_to_le64(realm->parent_ino);
3584
3585 err = ceph_pagelist_append(pagelist, &sr_rec, sizeof(sr_rec));
3586 if (err)
3587 goto fail;
3588
3589 recon_state->nr_realms++;
3590 }
3591 fail:
3592 return err;
3593 }
3594
3595
3596 /*
3597 * If an MDS fails and recovers, clients need to reconnect in order to
3598 * reestablish shared state. This includes all caps issued through
3599 * this session _and_ the snap_realm hierarchy. Because it's not
3600 * clear which snap realms the mds cares about, we send everything we
3601 * know about.. that ensures we'll then get any new info the
3602 * recovering MDS might have.
3603 *
3604 * This is a relatively heavyweight operation, but it's rare.
3605 *
3606 * called with mdsc->mutex held.
3607 */
3608 static void send_mds_reconnect(struct ceph_mds_client *mdsc,
3609 struct ceph_mds_session *session)
3610 {
3611 struct ceph_msg *reply;
3612 int mds = session->s_mds;
3613 int err = -ENOMEM;
3614 struct ceph_reconnect_state recon_state = {
3615 .session = session,
3616 };
3617 LIST_HEAD(dispose);
3618
3619 pr_info("mds%d reconnect start\n", mds);
3620
3621 recon_state.pagelist = ceph_pagelist_alloc(GFP_NOFS);
3622 if (!recon_state.pagelist)
3623 goto fail_nopagelist;
3624
3625 reply = ceph_msg_new2(CEPH_MSG_CLIENT_RECONNECT, 0, 1, GFP_NOFS, false);
3626 if (!reply)
3627 goto fail_nomsg;
3628
3629 mutex_lock(&session->s_mutex);
3630 session->s_state = CEPH_MDS_SESSION_RECONNECTING;
3631 session->s_seq = 0;
3632
3633 dout("session %p state %s\n", session,
3634 ceph_session_state_name(session->s_state));
3635
3636 spin_lock(&session->s_gen_ttl_lock);
3637 session->s_cap_gen++;
3638 spin_unlock(&session->s_gen_ttl_lock);
3639
3640 spin_lock(&session->s_cap_lock);
3641 /* don't know if session is readonly */
3642 session->s_readonly = 0;
3643 /*
3644 * notify __ceph_remove_cap() that we are composing cap reconnect.
3645 * If a cap get released before being added to the cap reconnect,
3646 * __ceph_remove_cap() should skip queuing cap release.
3647 */
3648 session->s_cap_reconnect = 1;
3649 /* drop old cap expires; we're about to reestablish that state */
3650 detach_cap_releases(session, &dispose);
3651 spin_unlock(&session->s_cap_lock);
3652 dispose_cap_releases(mdsc, &dispose);
3653
3654 /* trim unused caps to reduce MDS's cache rejoin time */
3655 if (mdsc->fsc->sb->s_root)
3656 shrink_dcache_parent(mdsc->fsc->sb->s_root);
3657
3658 ceph_con_close(&session->s_con);
3659 ceph_con_open(&session->s_con,
3660 CEPH_ENTITY_TYPE_MDS, mds,
3661 ceph_mdsmap_get_addr(mdsc->mdsmap, mds));
3662
3663 /* replay unsafe requests */
3664 replay_unsafe_requests(mdsc, session);
3665
3666 ceph_early_kick_flushing_caps(mdsc, session);
3667
3668 down_read(&mdsc->snap_rwsem);
3669
3670 /* placeholder for nr_caps */
3671 err = ceph_pagelist_encode_32(recon_state.pagelist, 0);
3672 if (err)
3673 goto fail;
3674
3675 if (test_bit(CEPHFS_FEATURE_MULTI_RECONNECT, &session->s_features)) {
3676 recon_state.msg_version = 3;
3677 recon_state.allow_multi = true;
3678 } else if (session->s_con.peer_features & CEPH_FEATURE_MDSENC) {
3679 recon_state.msg_version = 3;
3680 } else {
3681 recon_state.msg_version = 2;
3682 }
3683 /* trsaverse this session's caps */
3684 err = ceph_iterate_session_caps(session, encode_caps_cb, &recon_state);
3685
3686 spin_lock(&session->s_cap_lock);
3687 session->s_cap_reconnect = 0;
3688 spin_unlock(&session->s_cap_lock);
3689
3690 if (err < 0)
3691 goto fail;
3692
3693 /* check if all realms can be encoded into current message */
3694 if (mdsc->num_snap_realms) {
3695 size_t total_len =
3696 recon_state.pagelist->length +
3697 mdsc->num_snap_realms *
3698 sizeof(struct ceph_mds_snaprealm_reconnect);
3699 if (recon_state.msg_version >= 4) {
3700 /* number of realms */
3701 total_len += sizeof(u32);
3702 /* version, compat_version and struct_len */
3703 total_len += mdsc->num_snap_realms *
3704 (2 * sizeof(u8) + sizeof(u32));
3705 }
3706 if (total_len > RECONNECT_MAX_SIZE) {
3707 if (!recon_state.allow_multi) {
3708 err = -ENOSPC;
3709 goto fail;
3710 }
3711 if (recon_state.nr_caps) {
3712 err = send_reconnect_partial(&recon_state);
3713 if (err)
3714 goto fail;
3715 }
3716 recon_state.msg_version = 5;
3717 }
3718 }
3719
3720 err = encode_snap_realms(mdsc, &recon_state);
3721 if (err < 0)
3722 goto fail;
3723
3724 if (recon_state.msg_version >= 5) {
3725 err = ceph_pagelist_encode_8(recon_state.pagelist, 0);
3726 if (err < 0)
3727 goto fail;
3728 }
3729
3730 if (recon_state.nr_caps || recon_state.nr_realms) {
3731 struct page *page =
3732 list_first_entry(&recon_state.pagelist->head,
3733 struct page, lru);
3734 __le32 *addr = kmap_atomic(page);
3735 if (recon_state.nr_caps) {
3736 WARN_ON(recon_state.nr_realms != mdsc->num_snap_realms);
3737 *addr = cpu_to_le32(recon_state.nr_caps);
3738 } else if (recon_state.msg_version >= 4) {
3739 *(addr + 1) = cpu_to_le32(recon_state.nr_realms);
3740 }
3741 kunmap_atomic(addr);
3742 }
3743
3744 reply->hdr.version = cpu_to_le16(recon_state.msg_version);
3745 if (recon_state.msg_version >= 4)
3746 reply->hdr.compat_version = cpu_to_le16(4);
3747
3748 reply->hdr.data_len = cpu_to_le32(recon_state.pagelist->length);
3749 ceph_msg_data_add_pagelist(reply, recon_state.pagelist);
3750
3751 ceph_con_send(&session->s_con, reply);
3752
3753 mutex_unlock(&session->s_mutex);
3754
3755 mutex_lock(&mdsc->mutex);
3756 __wake_requests(mdsc, &session->s_waiting);
3757 mutex_unlock(&mdsc->mutex);
3758
3759 up_read(&mdsc->snap_rwsem);
3760 ceph_pagelist_release(recon_state.pagelist);
3761 return;
3762
3763 fail:
3764 ceph_msg_put(reply);
3765 up_read(&mdsc->snap_rwsem);
3766 mutex_unlock(&session->s_mutex);
3767 fail_nomsg:
3768 ceph_pagelist_release(recon_state.pagelist);
3769 fail_nopagelist:
3770 pr_err("error %d preparing reconnect for mds%d\n", err, mds);
3771 return;
3772 }
3773
3774
3775 /*
3776 * compare old and new mdsmaps, kicking requests
3777 * and closing out old connections as necessary
3778 *
3779 * called under mdsc->mutex.
3780 */
3781 static void check_new_map(struct ceph_mds_client *mdsc,
3782 struct ceph_mdsmap *newmap,
3783 struct ceph_mdsmap *oldmap)
3784 {
3785 int i;
3786 int oldstate, newstate;
3787 struct ceph_mds_session *s;
3788
3789 dout("check_new_map new %u old %u\n",
3790 newmap->m_epoch, oldmap->m_epoch);
3791
3792 for (i = 0; i < oldmap->possible_max_rank && i < mdsc->max_sessions; i++) {
3793 if (!mdsc->sessions[i])
3794 continue;
3795 s = mdsc->sessions[i];
3796 oldstate = ceph_mdsmap_get_state(oldmap, i);
3797 newstate = ceph_mdsmap_get_state(newmap, i);
3798
3799 dout("check_new_map mds%d state %s%s -> %s%s (session %s)\n",
3800 i, ceph_mds_state_name(oldstate),
3801 ceph_mdsmap_is_laggy(oldmap, i) ? " (laggy)" : "",
3802 ceph_mds_state_name(newstate),
3803 ceph_mdsmap_is_laggy(newmap, i) ? " (laggy)" : "",
3804 ceph_session_state_name(s->s_state));
3805
3806 if (i >= newmap->possible_max_rank) {
3807 /* force close session for stopped mds */
3808 ceph_get_mds_session(s);
3809 __unregister_session(mdsc, s);
3810 __wake_requests(mdsc, &s->s_waiting);
3811 mutex_unlock(&mdsc->mutex);
3812
3813 mutex_lock(&s->s_mutex);
3814 cleanup_session_requests(mdsc, s);
3815 remove_session_caps(s);
3816 mutex_unlock(&s->s_mutex);
3817
3818 ceph_put_mds_session(s);
3819
3820 mutex_lock(&mdsc->mutex);
3821 kick_requests(mdsc, i);
3822 continue;
3823 }
3824
3825 if (memcmp(ceph_mdsmap_get_addr(oldmap, i),
3826 ceph_mdsmap_get_addr(newmap, i),
3827 sizeof(struct ceph_entity_addr))) {
3828 /* just close it */
3829 mutex_unlock(&mdsc->mutex);
3830 mutex_lock(&s->s_mutex);
3831 mutex_lock(&mdsc->mutex);
3832 ceph_con_close(&s->s_con);
3833 mutex_unlock(&s->s_mutex);
3834 s->s_state = CEPH_MDS_SESSION_RESTARTING;
3835 } else if (oldstate == newstate) {
3836 continue; /* nothing new with this mds */
3837 }
3838
3839 /*
3840 * send reconnect?
3841 */
3842 if (s->s_state == CEPH_MDS_SESSION_RESTARTING &&
3843 newstate >= CEPH_MDS_STATE_RECONNECT) {
3844 mutex_unlock(&mdsc->mutex);
3845 send_mds_reconnect(mdsc, s);
3846 mutex_lock(&mdsc->mutex);
3847 }
3848
3849 /*
3850 * kick request on any mds that has gone active.
3851 */
3852 if (oldstate < CEPH_MDS_STATE_ACTIVE &&
3853 newstate >= CEPH_MDS_STATE_ACTIVE) {
3854 if (oldstate != CEPH_MDS_STATE_CREATING &&
3855 oldstate != CEPH_MDS_STATE_STARTING)
3856 pr_info("mds%d recovery completed\n", s->s_mds);
3857 kick_requests(mdsc, i);
3858 ceph_kick_flushing_caps(mdsc, s);
3859 wake_up_session_caps(s, RECONNECT);
3860 }
3861 }
3862
3863 for (i = 0; i < newmap->possible_max_rank && i < mdsc->max_sessions; i++) {
3864 s = mdsc->sessions[i];
3865 if (!s)
3866 continue;
3867 if (!ceph_mdsmap_is_laggy(newmap, i))
3868 continue;
3869 if (s->s_state == CEPH_MDS_SESSION_OPEN ||
3870 s->s_state == CEPH_MDS_SESSION_HUNG ||
3871 s->s_state == CEPH_MDS_SESSION_CLOSING) {
3872 dout(" connecting to export targets of laggy mds%d\n",
3873 i);
3874 __open_export_target_sessions(mdsc, s);
3875 }
3876 }
3877 }
3878
3879
3880
3881 /*
3882 * leases
3883 */
3884
3885 /*
3886 * caller must hold session s_mutex, dentry->d_lock
3887 */
3888 void __ceph_mdsc_drop_dentry_lease(struct dentry *dentry)
3889 {
3890 struct ceph_dentry_info *di = ceph_dentry(dentry);
3891
3892 ceph_put_mds_session(di->lease_session);
3893 di->lease_session = NULL;
3894 }
3895
3896 static void handle_lease(struct ceph_mds_client *mdsc,
3897 struct ceph_mds_session *session,
3898 struct ceph_msg *msg)
3899 {
3900 struct super_block *sb = mdsc->fsc->sb;
3901 struct inode *inode;
3902 struct dentry *parent, *dentry;
3903 struct ceph_dentry_info *di;
3904 int mds = session->s_mds;
3905 struct ceph_mds_lease *h = msg->front.iov_base;
3906 u32 seq;
3907 struct ceph_vino vino;
3908 struct qstr dname;
3909 int release = 0;
3910
3911 dout("handle_lease from mds%d\n", mds);
3912
3913 /* decode */
3914 if (msg->front.iov_len < sizeof(*h) + sizeof(u32))
3915 goto bad;
3916 vino.ino = le64_to_cpu(h->ino);
3917 vino.snap = CEPH_NOSNAP;
3918 seq = le32_to_cpu(h->seq);
3919 dname.len = get_unaligned_le32(h + 1);
3920 if (msg->front.iov_len < sizeof(*h) + sizeof(u32) + dname.len)
3921 goto bad;
3922 dname.name = (void *)(h + 1) + sizeof(u32);
3923
3924 /* lookup inode */
3925 inode = ceph_find_inode(sb, vino);
3926 dout("handle_lease %s, ino %llx %p %.*s\n",
3927 ceph_lease_op_name(h->action), vino.ino, inode,
3928 dname.len, dname.name);
3929
3930 mutex_lock(&session->s_mutex);
3931 session->s_seq++;
3932
3933 if (!inode) {
3934 dout("handle_lease no inode %llx\n", vino.ino);
3935 goto release;
3936 }
3937
3938 /* dentry */
3939 parent = d_find_alias(inode);
3940 if (!parent) {
3941 dout("no parent dentry on inode %p\n", inode);
3942 WARN_ON(1);
3943 goto release; /* hrm... */
3944 }
3945 dname.hash = full_name_hash(parent, dname.name, dname.len);
3946 dentry = d_lookup(parent, &dname);
3947 dput(parent);
3948 if (!dentry)
3949 goto release;
3950
3951 spin_lock(&dentry->d_lock);
3952 di = ceph_dentry(dentry);
3953 switch (h->action) {
3954 case CEPH_MDS_LEASE_REVOKE:
3955 if (di->lease_session == session) {
3956 if (ceph_seq_cmp(di->lease_seq, seq) > 0)
3957 h->seq = cpu_to_le32(di->lease_seq);
3958 __ceph_mdsc_drop_dentry_lease(dentry);
3959 }
3960 release = 1;
3961 break;
3962
3963 case CEPH_MDS_LEASE_RENEW:
3964 if (di->lease_session == session &&
3965 di->lease_gen == session->s_cap_gen &&
3966 di->lease_renew_from &&
3967 di->lease_renew_after == 0) {
3968 unsigned long duration =
3969 msecs_to_jiffies(le32_to_cpu(h->duration_ms));
3970
3971 di->lease_seq = seq;
3972 di->time = di->lease_renew_from + duration;
3973 di->lease_renew_after = di->lease_renew_from +
3974 (duration >> 1);
3975 di->lease_renew_from = 0;
3976 }
3977 break;
3978 }
3979 spin_unlock(&dentry->d_lock);
3980 dput(dentry);
3981
3982 if (!release)
3983 goto out;
3984
3985 release:
3986 /* let's just reuse the same message */
3987 h->action = CEPH_MDS_LEASE_REVOKE_ACK;
3988 ceph_msg_get(msg);
3989 ceph_con_send(&session->s_con, msg);
3990
3991 out:
3992 mutex_unlock(&session->s_mutex);
3993 /* avoid calling iput_final() in mds dispatch threads */
3994 ceph_async_iput(inode);
3995 return;
3996
3997 bad:
3998 pr_err("corrupt lease message\n");
3999 ceph_msg_dump(msg);
4000 }
4001
4002 void ceph_mdsc_lease_send_msg(struct ceph_mds_session *session,
4003 struct dentry *dentry, char action,
4004 u32 seq)
4005 {
4006 struct ceph_msg *msg;
4007 struct ceph_mds_lease *lease;
4008 struct inode *dir;
4009 int len = sizeof(*lease) + sizeof(u32) + NAME_MAX;
4010
4011 dout("lease_send_msg identry %p %s to mds%d\n",
4012 dentry, ceph_lease_op_name(action), session->s_mds);
4013
4014 msg = ceph_msg_new(CEPH_MSG_CLIENT_LEASE, len, GFP_NOFS, false);
4015 if (!msg)
4016 return;
4017 lease = msg->front.iov_base;
4018 lease->action = action;
4019 lease->seq = cpu_to_le32(seq);
4020
4021 spin_lock(&dentry->d_lock);
4022 dir = d_inode(dentry->d_parent);
4023 lease->ino = cpu_to_le64(ceph_ino(dir));
4024 lease->first = lease->last = cpu_to_le64(ceph_snap(dir));
4025
4026 put_unaligned_le32(dentry->d_name.len, lease + 1);
4027 memcpy((void *)(lease + 1) + 4,
4028 dentry->d_name.name, dentry->d_name.len);
4029 spin_unlock(&dentry->d_lock);
4030 /*
4031 * if this is a preemptive lease RELEASE, no need to
4032 * flush request stream, since the actual request will
4033 * soon follow.
4034 */
4035 msg->more_to_follow = (action == CEPH_MDS_LEASE_RELEASE);
4036
4037 ceph_con_send(&session->s_con, msg);
4038 }
4039
4040 /*
4041 * lock unlock sessions, to wait ongoing session activities
4042 */
4043 static void lock_unlock_sessions(struct ceph_mds_client *mdsc)
4044 {
4045 int i;
4046
4047 mutex_lock(&mdsc->mutex);
4048 for (i = 0; i < mdsc->max_sessions; i++) {
4049 struct ceph_mds_session *s = __ceph_lookup_mds_session(mdsc, i);
4050 if (!s)
4051 continue;
4052 mutex_unlock(&mdsc->mutex);
4053 mutex_lock(&s->s_mutex);
4054 mutex_unlock(&s->s_mutex);
4055 ceph_put_mds_session(s);
4056 mutex_lock(&mdsc->mutex);
4057 }
4058 mutex_unlock(&mdsc->mutex);
4059 }
4060
4061 static void maybe_recover_session(struct ceph_mds_client *mdsc)
4062 {
4063 struct ceph_fs_client *fsc = mdsc->fsc;
4064
4065 if (!ceph_test_mount_opt(fsc, CLEANRECOVER))
4066 return;
4067
4068 if (READ_ONCE(fsc->mount_state) != CEPH_MOUNT_MOUNTED)
4069 return;
4070
4071 if (!READ_ONCE(fsc->blacklisted))
4072 return;
4073
4074 if (fsc->last_auto_reconnect &&
4075 time_before(jiffies, fsc->last_auto_reconnect + HZ * 60 * 30))
4076 return;
4077
4078 pr_info("auto reconnect after blacklisted\n");
4079 fsc->last_auto_reconnect = jiffies;
4080 ceph_force_reconnect(fsc->sb);
4081 }
4082
4083 /*
4084 * delayed work -- periodically trim expired leases, renew caps with mds
4085 */
4086 static void schedule_delayed(struct ceph_mds_client *mdsc)
4087 {
4088 int delay = 5;
4089 unsigned hz = round_jiffies_relative(HZ * delay);
4090 schedule_delayed_work(&mdsc->delayed_work, hz);
4091 }
4092
4093 static void delayed_work(struct work_struct *work)
4094 {
4095 int i;
4096 struct ceph_mds_client *mdsc =
4097 container_of(work, struct ceph_mds_client, delayed_work.work);
4098 int renew_interval;
4099 int renew_caps;
4100
4101 dout("mdsc delayed_work\n");
4102
4103 mutex_lock(&mdsc->mutex);
4104 renew_interval = mdsc->mdsmap->m_session_timeout >> 2;
4105 renew_caps = time_after_eq(jiffies, HZ*renew_interval +
4106 mdsc->last_renew_caps);
4107 if (renew_caps)
4108 mdsc->last_renew_caps = jiffies;
4109
4110 for (i = 0; i < mdsc->max_sessions; i++) {
4111 struct ceph_mds_session *s = __ceph_lookup_mds_session(mdsc, i);
4112 if (!s)
4113 continue;
4114 if (s->s_state == CEPH_MDS_SESSION_CLOSING) {
4115 dout("resending session close request for mds%d\n",
4116 s->s_mds);
4117 request_close_session(mdsc, s);
4118 ceph_put_mds_session(s);
4119 continue;
4120 }
4121 if (s->s_ttl && time_after(jiffies, s->s_ttl)) {
4122 if (s->s_state == CEPH_MDS_SESSION_OPEN) {
4123 s->s_state = CEPH_MDS_SESSION_HUNG;
4124 pr_info("mds%d hung\n", s->s_mds);
4125 }
4126 }
4127 if (s->s_state == CEPH_MDS_SESSION_NEW ||
4128 s->s_state == CEPH_MDS_SESSION_RESTARTING ||
4129 s->s_state == CEPH_MDS_SESSION_REJECTED) {
4130 /* this mds is failed or recovering, just wait */
4131 ceph_put_mds_session(s);
4132 continue;
4133 }
4134 mutex_unlock(&mdsc->mutex);
4135
4136 mutex_lock(&s->s_mutex);
4137 if (renew_caps)
4138 send_renew_caps(mdsc, s);
4139 else
4140 ceph_con_keepalive(&s->s_con);
4141 if (s->s_state == CEPH_MDS_SESSION_OPEN ||
4142 s->s_state == CEPH_MDS_SESSION_HUNG)
4143 ceph_send_cap_releases(mdsc, s);
4144 mutex_unlock(&s->s_mutex);
4145 ceph_put_mds_session(s);
4146
4147 mutex_lock(&mdsc->mutex);
4148 }
4149 mutex_unlock(&mdsc->mutex);
4150
4151 ceph_check_delayed_caps(mdsc);
4152
4153 ceph_queue_cap_reclaim_work(mdsc);
4154
4155 ceph_trim_snapid_map(mdsc);
4156
4157 maybe_recover_session(mdsc);
4158
4159 schedule_delayed(mdsc);
4160 }
4161
4162 int ceph_mdsc_init(struct ceph_fs_client *fsc)
4163
4164 {
4165 struct ceph_mds_client *mdsc;
4166
4167 mdsc = kzalloc(sizeof(struct ceph_mds_client), GFP_NOFS);
4168 if (!mdsc)
4169 return -ENOMEM;
4170 mdsc->fsc = fsc;
4171 mutex_init(&mdsc->mutex);
4172 mdsc->mdsmap = kzalloc(sizeof(*mdsc->mdsmap), GFP_NOFS);
4173 if (!mdsc->mdsmap) {
4174 kfree(mdsc);
4175 return -ENOMEM;
4176 }
4177
4178 fsc->mdsc = mdsc;
4179 init_completion(&mdsc->safe_umount_waiters);
4180 init_waitqueue_head(&mdsc->session_close_wq);
4181 INIT_LIST_HEAD(&mdsc->waiting_for_map);
4182 mdsc->sessions = NULL;
4183 atomic_set(&mdsc->num_sessions, 0);
4184 mdsc->max_sessions = 0;
4185 mdsc->stopping = 0;
4186 atomic64_set(&mdsc->quotarealms_count, 0);
4187 mdsc->quotarealms_inodes = RB_ROOT;
4188 mutex_init(&mdsc->quotarealms_inodes_mutex);
4189 mdsc->last_snap_seq = 0;
4190 init_rwsem(&mdsc->snap_rwsem);
4191 mdsc->snap_realms = RB_ROOT;
4192 INIT_LIST_HEAD(&mdsc->snap_empty);
4193 mdsc->num_snap_realms = 0;
4194 spin_lock_init(&mdsc->snap_empty_lock);
4195 mdsc->last_tid = 0;
4196 mdsc->oldest_tid = 0;
4197 mdsc->request_tree = RB_ROOT;
4198 INIT_DELAYED_WORK(&mdsc->delayed_work, delayed_work);
4199 mdsc->last_renew_caps = jiffies;
4200 INIT_LIST_HEAD(&mdsc->cap_delay_list);
4201 INIT_LIST_HEAD(&mdsc->cap_wait_list);
4202 spin_lock_init(&mdsc->cap_delay_lock);
4203 INIT_LIST_HEAD(&mdsc->snap_flush_list);
4204 spin_lock_init(&mdsc->snap_flush_lock);
4205 mdsc->last_cap_flush_tid = 1;
4206 INIT_LIST_HEAD(&mdsc->cap_flush_list);
4207 INIT_LIST_HEAD(&mdsc->cap_dirty);
4208 INIT_LIST_HEAD(&mdsc->cap_dirty_migrating);
4209 mdsc->num_cap_flushing = 0;
4210 spin_lock_init(&mdsc->cap_dirty_lock);
4211 init_waitqueue_head(&mdsc->cap_flushing_wq);
4212 INIT_WORK(&mdsc->cap_reclaim_work, ceph_cap_reclaim_work);
4213 atomic_set(&mdsc->cap_reclaim_pending, 0);
4214
4215 spin_lock_init(&mdsc->dentry_list_lock);
4216 INIT_LIST_HEAD(&mdsc->dentry_leases);
4217 INIT_LIST_HEAD(&mdsc->dentry_dir_leases);
4218
4219 ceph_caps_init(mdsc);
4220 ceph_adjust_caps_max_min(mdsc, fsc->mount_options);
4221
4222 spin_lock_init(&mdsc->snapid_map_lock);
4223 mdsc->snapid_map_tree = RB_ROOT;
4224 INIT_LIST_HEAD(&mdsc->snapid_map_lru);
4225
4226 init_rwsem(&mdsc->pool_perm_rwsem);
4227 mdsc->pool_perm_tree = RB_ROOT;
4228
4229 strscpy(mdsc->nodename, utsname()->nodename,
4230 sizeof(mdsc->nodename));
4231 return 0;
4232 }
4233
4234 /*
4235 * Wait for safe replies on open mds requests. If we time out, drop
4236 * all requests from the tree to avoid dangling dentry refs.
4237 */
4238 static void wait_requests(struct ceph_mds_client *mdsc)
4239 {
4240 struct ceph_options *opts = mdsc->fsc->client->options;
4241 struct ceph_mds_request *req;
4242
4243 mutex_lock(&mdsc->mutex);
4244 if (__get_oldest_req(mdsc)) {
4245 mutex_unlock(&mdsc->mutex);
4246
4247 dout("wait_requests waiting for requests\n");
4248 wait_for_completion_timeout(&mdsc->safe_umount_waiters,
4249 ceph_timeout_jiffies(opts->mount_timeout));
4250
4251 /* tear down remaining requests */
4252 mutex_lock(&mdsc->mutex);
4253 while ((req = __get_oldest_req(mdsc))) {
4254 dout("wait_requests timed out on tid %llu\n",
4255 req->r_tid);
4256 list_del_init(&req->r_wait);
4257 __unregister_request(mdsc, req);
4258 }
4259 }
4260 mutex_unlock(&mdsc->mutex);
4261 dout("wait_requests done\n");
4262 }
4263
4264 /*
4265 * called before mount is ro, and before dentries are torn down.
4266 * (hmm, does this still race with new lookups?)
4267 */
4268 void ceph_mdsc_pre_umount(struct ceph_mds_client *mdsc)
4269 {
4270 dout("pre_umount\n");
4271 mdsc->stopping = 1;
4272
4273 lock_unlock_sessions(mdsc);
4274 ceph_flush_dirty_caps(mdsc);
4275 wait_requests(mdsc);
4276
4277 /*
4278 * wait for reply handlers to drop their request refs and
4279 * their inode/dcache refs
4280 */
4281 ceph_msgr_flush();
4282
4283 ceph_cleanup_quotarealms_inodes(mdsc);
4284 }
4285
4286 /*
4287 * wait for all write mds requests to flush.
4288 */
4289 static void wait_unsafe_requests(struct ceph_mds_client *mdsc, u64 want_tid)
4290 {
4291 struct ceph_mds_request *req = NULL, *nextreq;
4292 struct rb_node *n;
4293
4294 mutex_lock(&mdsc->mutex);
4295 dout("wait_unsafe_requests want %lld\n", want_tid);
4296 restart:
4297 req = __get_oldest_req(mdsc);
4298 while (req && req->r_tid <= want_tid) {
4299 /* find next request */
4300 n = rb_next(&req->r_node);
4301 if (n)
4302 nextreq = rb_entry(n, struct ceph_mds_request, r_node);
4303 else
4304 nextreq = NULL;
4305 if (req->r_op != CEPH_MDS_OP_SETFILELOCK &&
4306 (req->r_op & CEPH_MDS_OP_WRITE)) {
4307 /* write op */
4308 ceph_mdsc_get_request(req);
4309 if (nextreq)
4310 ceph_mdsc_get_request(nextreq);
4311 mutex_unlock(&mdsc->mutex);
4312 dout("wait_unsafe_requests wait on %llu (want %llu)\n",
4313 req->r_tid, want_tid);
4314 wait_for_completion(&req->r_safe_completion);
4315 mutex_lock(&mdsc->mutex);
4316 ceph_mdsc_put_request(req);
4317 if (!nextreq)
4318 break; /* next dne before, so we're done! */
4319 if (RB_EMPTY_NODE(&nextreq->r_node)) {
4320 /* next request was removed from tree */
4321 ceph_mdsc_put_request(nextreq);
4322 goto restart;
4323 }
4324 ceph_mdsc_put_request(nextreq); /* won't go away */
4325 }
4326 req = nextreq;
4327 }
4328 mutex_unlock(&mdsc->mutex);
4329 dout("wait_unsafe_requests done\n");
4330 }
4331
4332 void ceph_mdsc_sync(struct ceph_mds_client *mdsc)
4333 {
4334 u64 want_tid, want_flush;
4335
4336 if (READ_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_SHUTDOWN)
4337 return;
4338
4339 dout("sync\n");
4340 mutex_lock(&mdsc->mutex);
4341 want_tid = mdsc->last_tid;
4342 mutex_unlock(&mdsc->mutex);
4343
4344 ceph_flush_dirty_caps(mdsc);
4345 spin_lock(&mdsc->cap_dirty_lock);
4346 want_flush = mdsc->last_cap_flush_tid;
4347 if (!list_empty(&mdsc->cap_flush_list)) {
4348 struct ceph_cap_flush *cf =
4349 list_last_entry(&mdsc->cap_flush_list,
4350 struct ceph_cap_flush, g_list);
4351 cf->wake = true;
4352 }
4353 spin_unlock(&mdsc->cap_dirty_lock);
4354
4355 dout("sync want tid %lld flush_seq %lld\n",
4356 want_tid, want_flush);
4357
4358 wait_unsafe_requests(mdsc, want_tid);
4359 wait_caps_flush(mdsc, want_flush);
4360 }
4361
4362 /*
4363 * true if all sessions are closed, or we force unmount
4364 */
4365 static bool done_closing_sessions(struct ceph_mds_client *mdsc, int skipped)
4366 {
4367 if (READ_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_SHUTDOWN)
4368 return true;
4369 return atomic_read(&mdsc->num_sessions) <= skipped;
4370 }
4371
4372 /*
4373 * called after sb is ro.
4374 */
4375 void ceph_mdsc_close_sessions(struct ceph_mds_client *mdsc)
4376 {
4377 struct ceph_options *opts = mdsc->fsc->client->options;
4378 struct ceph_mds_session *session;
4379 int i;
4380 int skipped = 0;
4381
4382 dout("close_sessions\n");
4383
4384 /* close sessions */
4385 mutex_lock(&mdsc->mutex);
4386 for (i = 0; i < mdsc->max_sessions; i++) {
4387 session = __ceph_lookup_mds_session(mdsc, i);
4388 if (!session)
4389 continue;
4390 mutex_unlock(&mdsc->mutex);
4391 mutex_lock(&session->s_mutex);
4392 if (__close_session(mdsc, session) <= 0)
4393 skipped++;
4394 mutex_unlock(&session->s_mutex);
4395 ceph_put_mds_session(session);
4396 mutex_lock(&mdsc->mutex);
4397 }
4398 mutex_unlock(&mdsc->mutex);
4399
4400 dout("waiting for sessions to close\n");
4401 wait_event_timeout(mdsc->session_close_wq,
4402 done_closing_sessions(mdsc, skipped),
4403 ceph_timeout_jiffies(opts->mount_timeout));
4404
4405 /* tear down remaining sessions */
4406 mutex_lock(&mdsc->mutex);
4407 for (i = 0; i < mdsc->max_sessions; i++) {
4408 if (mdsc->sessions[i]) {
4409 session = ceph_get_mds_session(mdsc->sessions[i]);
4410 __unregister_session(mdsc, session);
4411 mutex_unlock(&mdsc->mutex);
4412 mutex_lock(&session->s_mutex);
4413 remove_session_caps(session);
4414 mutex_unlock(&session->s_mutex);
4415 ceph_put_mds_session(session);
4416 mutex_lock(&mdsc->mutex);
4417 }
4418 }
4419 WARN_ON(!list_empty(&mdsc->cap_delay_list));
4420 mutex_unlock(&mdsc->mutex);
4421
4422 ceph_cleanup_snapid_map(mdsc);
4423 ceph_cleanup_empty_realms(mdsc);
4424
4425 cancel_work_sync(&mdsc->cap_reclaim_work);
4426 cancel_delayed_work_sync(&mdsc->delayed_work); /* cancel timer */
4427
4428 dout("stopped\n");
4429 }
4430
4431 void ceph_mdsc_force_umount(struct ceph_mds_client *mdsc)
4432 {
4433 struct ceph_mds_session *session;
4434 int mds;
4435
4436 dout("force umount\n");
4437
4438 mutex_lock(&mdsc->mutex);
4439 for (mds = 0; mds < mdsc->max_sessions; mds++) {
4440 session = __ceph_lookup_mds_session(mdsc, mds);
4441 if (!session)
4442 continue;
4443
4444 if (session->s_state == CEPH_MDS_SESSION_REJECTED)
4445 __unregister_session(mdsc, session);
4446 __wake_requests(mdsc, &session->s_waiting);
4447 mutex_unlock(&mdsc->mutex);
4448
4449 mutex_lock(&session->s_mutex);
4450 __close_session(mdsc, session);
4451 if (session->s_state == CEPH_MDS_SESSION_CLOSING) {
4452 cleanup_session_requests(mdsc, session);
4453 remove_session_caps(session);
4454 }
4455 mutex_unlock(&session->s_mutex);
4456 ceph_put_mds_session(session);
4457
4458 mutex_lock(&mdsc->mutex);
4459 kick_requests(mdsc, mds);
4460 }
4461 __wake_requests(mdsc, &mdsc->waiting_for_map);
4462 mutex_unlock(&mdsc->mutex);
4463 }
4464
4465 static void ceph_mdsc_stop(struct ceph_mds_client *mdsc)
4466 {
4467 dout("stop\n");
4468 cancel_delayed_work_sync(&mdsc->delayed_work); /* cancel timer */
4469 if (mdsc->mdsmap)
4470 ceph_mdsmap_destroy(mdsc->mdsmap);
4471 kfree(mdsc->sessions);
4472 ceph_caps_finalize(mdsc);
4473 ceph_pool_perm_destroy(mdsc);
4474 }
4475
4476 void ceph_mdsc_destroy(struct ceph_fs_client *fsc)
4477 {
4478 struct ceph_mds_client *mdsc = fsc->mdsc;
4479 dout("mdsc_destroy %p\n", mdsc);
4480
4481 if (!mdsc)
4482 return;
4483
4484 /* flush out any connection work with references to us */
4485 ceph_msgr_flush();
4486
4487 ceph_mdsc_stop(mdsc);
4488
4489 fsc->mdsc = NULL;
4490 kfree(mdsc);
4491 dout("mdsc_destroy %p done\n", mdsc);
4492 }
4493
4494 void ceph_mdsc_handle_fsmap(struct ceph_mds_client *mdsc, struct ceph_msg *msg)
4495 {
4496 struct ceph_fs_client *fsc = mdsc->fsc;
4497 const char *mds_namespace = fsc->mount_options->mds_namespace;
4498 void *p = msg->front.iov_base;
4499 void *end = p + msg->front.iov_len;
4500 u32 epoch;
4501 u32 map_len;
4502 u32 num_fs;
4503 u32 mount_fscid = (u32)-1;
4504 u8 struct_v, struct_cv;
4505 int err = -EINVAL;
4506
4507 ceph_decode_need(&p, end, sizeof(u32), bad);
4508 epoch = ceph_decode_32(&p);
4509
4510 dout("handle_fsmap epoch %u\n", epoch);
4511
4512 ceph_decode_need(&p, end, 2 + sizeof(u32), bad);
4513 struct_v = ceph_decode_8(&p);
4514 struct_cv = ceph_decode_8(&p);
4515 map_len = ceph_decode_32(&p);
4516
4517 ceph_decode_need(&p, end, sizeof(u32) * 3, bad);
4518 p += sizeof(u32) * 2; /* skip epoch and legacy_client_fscid */
4519
4520 num_fs = ceph_decode_32(&p);
4521 while (num_fs-- > 0) {
4522 void *info_p, *info_end;
4523 u32 info_len;
4524 u8 info_v, info_cv;
4525 u32 fscid, namelen;
4526
4527 ceph_decode_need(&p, end, 2 + sizeof(u32), bad);
4528 info_v = ceph_decode_8(&p);
4529 info_cv = ceph_decode_8(&p);
4530 info_len = ceph_decode_32(&p);
4531 ceph_decode_need(&p, end, info_len, bad);
4532 info_p = p;
4533 info_end = p + info_len;
4534 p = info_end;
4535
4536 ceph_decode_need(&info_p, info_end, sizeof(u32) * 2, bad);
4537 fscid = ceph_decode_32(&info_p);
4538 namelen = ceph_decode_32(&info_p);
4539 ceph_decode_need(&info_p, info_end, namelen, bad);
4540
4541 if (mds_namespace &&
4542 strlen(mds_namespace) == namelen &&
4543 !strncmp(mds_namespace, (char *)info_p, namelen)) {
4544 mount_fscid = fscid;
4545 break;
4546 }
4547 }
4548
4549 ceph_monc_got_map(&fsc->client->monc, CEPH_SUB_FSMAP, epoch);
4550 if (mount_fscid != (u32)-1) {
4551 fsc->client->monc.fs_cluster_id = mount_fscid;
4552 ceph_monc_want_map(&fsc->client->monc, CEPH_SUB_MDSMAP,
4553 0, true);
4554 ceph_monc_renew_subs(&fsc->client->monc);
4555 } else {
4556 err = -ENOENT;
4557 goto err_out;
4558 }
4559 return;
4560
4561 bad:
4562 pr_err("error decoding fsmap\n");
4563 err_out:
4564 mutex_lock(&mdsc->mutex);
4565 mdsc->mdsmap_err = err;
4566 __wake_requests(mdsc, &mdsc->waiting_for_map);
4567 mutex_unlock(&mdsc->mutex);
4568 }
4569
4570 /*
4571 * handle mds map update.
4572 */
4573 void ceph_mdsc_handle_mdsmap(struct ceph_mds_client *mdsc, struct ceph_msg *msg)
4574 {
4575 u32 epoch;
4576 u32 maplen;
4577 void *p = msg->front.iov_base;
4578 void *end = p + msg->front.iov_len;
4579 struct ceph_mdsmap *newmap, *oldmap;
4580 struct ceph_fsid fsid;
4581 int err = -EINVAL;
4582
4583 ceph_decode_need(&p, end, sizeof(fsid)+2*sizeof(u32), bad);
4584 ceph_decode_copy(&p, &fsid, sizeof(fsid));
4585 if (ceph_check_fsid(mdsc->fsc->client, &fsid) < 0)
4586 return;
4587 epoch = ceph_decode_32(&p);
4588 maplen = ceph_decode_32(&p);
4589 dout("handle_map epoch %u len %d\n", epoch, (int)maplen);
4590
4591 /* do we need it? */
4592 mutex_lock(&mdsc->mutex);
4593 if (mdsc->mdsmap && epoch <= mdsc->mdsmap->m_epoch) {
4594 dout("handle_map epoch %u <= our %u\n",
4595 epoch, mdsc->mdsmap->m_epoch);
4596 mutex_unlock(&mdsc->mutex);
4597 return;
4598 }
4599
4600 newmap = ceph_mdsmap_decode(&p, end);
4601 if (IS_ERR(newmap)) {
4602 err = PTR_ERR(newmap);
4603 goto bad_unlock;
4604 }
4605
4606 /* swap into place */
4607 if (mdsc->mdsmap) {
4608 oldmap = mdsc->mdsmap;
4609 mdsc->mdsmap = newmap;
4610 check_new_map(mdsc, newmap, oldmap);
4611 ceph_mdsmap_destroy(oldmap);
4612 } else {
4613 mdsc->mdsmap = newmap; /* first mds map */
4614 }
4615 mdsc->fsc->max_file_size = min((loff_t)mdsc->mdsmap->m_max_file_size,
4616 MAX_LFS_FILESIZE);
4617
4618 __wake_requests(mdsc, &mdsc->waiting_for_map);
4619 ceph_monc_got_map(&mdsc->fsc->client->monc, CEPH_SUB_MDSMAP,
4620 mdsc->mdsmap->m_epoch);
4621
4622 mutex_unlock(&mdsc->mutex);
4623 schedule_delayed(mdsc);
4624 return;
4625
4626 bad_unlock:
4627 mutex_unlock(&mdsc->mutex);
4628 bad:
4629 pr_err("error decoding mdsmap %d\n", err);
4630 return;
4631 }
4632
4633 static struct ceph_connection *con_get(struct ceph_connection *con)
4634 {
4635 struct ceph_mds_session *s = con->private;
4636
4637 if (ceph_get_mds_session(s))
4638 return con;
4639 return NULL;
4640 }
4641
4642 static void con_put(struct ceph_connection *con)
4643 {
4644 struct ceph_mds_session *s = con->private;
4645
4646 ceph_put_mds_session(s);
4647 }
4648
4649 /*
4650 * if the client is unresponsive for long enough, the mds will kill
4651 * the session entirely.
4652 */
4653 static void peer_reset(struct ceph_connection *con)
4654 {
4655 struct ceph_mds_session *s = con->private;
4656 struct ceph_mds_client *mdsc = s->s_mdsc;
4657
4658 pr_warn("mds%d closed our session\n", s->s_mds);
4659 send_mds_reconnect(mdsc, s);
4660 }
4661
4662 static void dispatch(struct ceph_connection *con, struct ceph_msg *msg)
4663 {
4664 struct ceph_mds_session *s = con->private;
4665 struct ceph_mds_client *mdsc = s->s_mdsc;
4666 int type = le16_to_cpu(msg->hdr.type);
4667
4668 mutex_lock(&mdsc->mutex);
4669 if (__verify_registered_session(mdsc, s) < 0) {
4670 mutex_unlock(&mdsc->mutex);
4671 goto out;
4672 }
4673 mutex_unlock(&mdsc->mutex);
4674
4675 switch (type) {
4676 case CEPH_MSG_MDS_MAP:
4677 ceph_mdsc_handle_mdsmap(mdsc, msg);
4678 break;
4679 case CEPH_MSG_FS_MAP_USER:
4680 ceph_mdsc_handle_fsmap(mdsc, msg);
4681 break;
4682 case CEPH_MSG_CLIENT_SESSION:
4683 handle_session(s, msg);
4684 break;
4685 case CEPH_MSG_CLIENT_REPLY:
4686 handle_reply(s, msg);
4687 break;
4688 case CEPH_MSG_CLIENT_REQUEST_FORWARD:
4689 handle_forward(mdsc, s, msg);
4690 break;
4691 case CEPH_MSG_CLIENT_CAPS:
4692 ceph_handle_caps(s, msg);
4693 break;
4694 case CEPH_MSG_CLIENT_SNAP:
4695 ceph_handle_snap(mdsc, s, msg);
4696 break;
4697 case CEPH_MSG_CLIENT_LEASE:
4698 handle_lease(mdsc, s, msg);
4699 break;
4700 case CEPH_MSG_CLIENT_QUOTA:
4701 ceph_handle_quota(mdsc, s, msg);
4702 break;
4703
4704 default:
4705 pr_err("received unknown message type %d %s\n", type,
4706 ceph_msg_type_name(type));
4707 }
4708 out:
4709 ceph_msg_put(msg);
4710 }
4711
4712 /*
4713 * authentication
4714 */
4715
4716 /*
4717 * Note: returned pointer is the address of a structure that's
4718 * managed separately. Caller must *not* attempt to free it.
4719 */
4720 static struct ceph_auth_handshake *get_authorizer(struct ceph_connection *con,
4721 int *proto, int force_new)
4722 {
4723 struct ceph_mds_session *s = con->private;
4724 struct ceph_mds_client *mdsc = s->s_mdsc;
4725 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
4726 struct ceph_auth_handshake *auth = &s->s_auth;
4727
4728 if (force_new && auth->authorizer) {
4729 ceph_auth_destroy_authorizer(auth->authorizer);
4730 auth->authorizer = NULL;
4731 }
4732 if (!auth->authorizer) {
4733 int ret = ceph_auth_create_authorizer(ac, CEPH_ENTITY_TYPE_MDS,
4734 auth);
4735 if (ret)
4736 return ERR_PTR(ret);
4737 } else {
4738 int ret = ceph_auth_update_authorizer(ac, CEPH_ENTITY_TYPE_MDS,
4739 auth);
4740 if (ret)
4741 return ERR_PTR(ret);
4742 }
4743 *proto = ac->protocol;
4744
4745 return auth;
4746 }
4747
4748 static int add_authorizer_challenge(struct ceph_connection *con,
4749 void *challenge_buf, int challenge_buf_len)
4750 {
4751 struct ceph_mds_session *s = con->private;
4752 struct ceph_mds_client *mdsc = s->s_mdsc;
4753 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
4754
4755 return ceph_auth_add_authorizer_challenge(ac, s->s_auth.authorizer,
4756 challenge_buf, challenge_buf_len);
4757 }
4758
4759 static int verify_authorizer_reply(struct ceph_connection *con)
4760 {
4761 struct ceph_mds_session *s = con->private;
4762 struct ceph_mds_client *mdsc = s->s_mdsc;
4763 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
4764
4765 return ceph_auth_verify_authorizer_reply(ac, s->s_auth.authorizer);
4766 }
4767
4768 static int invalidate_authorizer(struct ceph_connection *con)
4769 {
4770 struct ceph_mds_session *s = con->private;
4771 struct ceph_mds_client *mdsc = s->s_mdsc;
4772 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
4773
4774 ceph_auth_invalidate_authorizer(ac, CEPH_ENTITY_TYPE_MDS);
4775
4776 return ceph_monc_validate_auth(&mdsc->fsc->client->monc);
4777 }
4778
4779 static struct ceph_msg *mds_alloc_msg(struct ceph_connection *con,
4780 struct ceph_msg_header *hdr, int *skip)
4781 {
4782 struct ceph_msg *msg;
4783 int type = (int) le16_to_cpu(hdr->type);
4784 int front_len = (int) le32_to_cpu(hdr->front_len);
4785
4786 if (con->in_msg)
4787 return con->in_msg;
4788
4789 *skip = 0;
4790 msg = ceph_msg_new(type, front_len, GFP_NOFS, false);
4791 if (!msg) {
4792 pr_err("unable to allocate msg type %d len %d\n",
4793 type, front_len);
4794 return NULL;
4795 }
4796
4797 return msg;
4798 }
4799
4800 static int mds_sign_message(struct ceph_msg *msg)
4801 {
4802 struct ceph_mds_session *s = msg->con->private;
4803 struct ceph_auth_handshake *auth = &s->s_auth;
4804
4805 return ceph_auth_sign_message(auth, msg);
4806 }
4807
4808 static int mds_check_message_signature(struct ceph_msg *msg)
4809 {
4810 struct ceph_mds_session *s = msg->con->private;
4811 struct ceph_auth_handshake *auth = &s->s_auth;
4812
4813 return ceph_auth_check_message_signature(auth, msg);
4814 }
4815
4816 static const struct ceph_connection_operations mds_con_ops = {
4817 .get = con_get,
4818 .put = con_put,
4819 .dispatch = dispatch,
4820 .get_authorizer = get_authorizer,
4821 .add_authorizer_challenge = add_authorizer_challenge,
4822 .verify_authorizer_reply = verify_authorizer_reply,
4823 .invalidate_authorizer = invalidate_authorizer,
4824 .peer_reset = peer_reset,
4825 .alloc_msg = mds_alloc_msg,
4826 .sign_message = mds_sign_message,
4827 .check_message_signature = mds_check_message_signature,
4828 };
4829
4830 /* eof */
Linux with added FPC-III support