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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#include <linux/ktime.h>
14#include <linux/bitmap.h>
15
16#include "super.h"
17#include "mds_client.h"
18
19#include <linux/ceph/ceph_features.h>
20#include <linux/ceph/messenger.h>
21#include <linux/ceph/decode.h>
22#include <linux/ceph/pagelist.h>
23#include <linux/ceph/auth.h>
24#include <linux/ceph/debugfs.h>
25
26#define RECONNECT_MAX_SIZE (INT_MAX - PAGE_SIZE)
27
28/*
29 * A cluster of MDS (metadata server) daemons is responsible for
30 * managing the file system namespace (the directory hierarchy and
31 * inodes) and for coordinating shared access to storage. Metadata is
32 * partitioning hierarchically across a number of servers, and that
33 * partition varies over time as the cluster adjusts the distribution
34 * in order to balance load.
35 *
36 * The MDS client is primarily responsible to managing synchronous
37 * metadata requests for operations like open, unlink, and so forth.
38 * If there is a MDS failure, we find out about it when we (possibly
39 * request and) receive a new MDS map, and can resubmit affected
40 * requests.
41 *
42 * For the most part, though, we take advantage of a lossless
43 * communications channel to the MDS, and do not need to worry about
44 * timing out or resubmitting requests.
45 *
46 * We maintain a stateful "session" with each MDS we interact with.
47 * Within each session, we sent periodic heartbeat messages to ensure
48 * any capabilities or leases we have been issues remain valid. If
49 * the session times out and goes stale, our leases and capabilities
50 * are no longer valid.
51 */
52
53struct ceph_reconnect_state {
54 struct ceph_mds_session *session;
55 int nr_caps, nr_realms;
56 struct ceph_pagelist *pagelist;
57 unsigned msg_version;
58 bool allow_multi;
59};
60
61static void __wake_requests(struct ceph_mds_client *mdsc,
62 struct list_head *head);
63static void ceph_cap_release_work(struct work_struct *work);
64static void ceph_cap_reclaim_work(struct work_struct *work);
65
66static const struct ceph_connection_operations mds_con_ops;
67
68
69/*
70 * mds reply parsing
71 */
72
73static int parse_reply_info_quota(void **p, void *end,
74 struct ceph_mds_reply_info_in *info)
75{
76 u8 struct_v, struct_compat;
77 u32 struct_len;
78
79 ceph_decode_8_safe(p, end, struct_v, bad);
80 ceph_decode_8_safe(p, end, struct_compat, bad);
81 /* struct_v is expected to be >= 1. we only
82 * understand encoding with struct_compat == 1. */
83 if (!struct_v || struct_compat != 1)
84 goto bad;
85 ceph_decode_32_safe(p, end, struct_len, bad);
86 ceph_decode_need(p, end, struct_len, bad);
87 end = *p + struct_len;
88 ceph_decode_64_safe(p, end, info->max_bytes, bad);
89 ceph_decode_64_safe(p, end, info->max_files, bad);
90 *p = end;
91 return 0;
92bad:
93 return -EIO;
94}
95
96/*
97 * parse individual inode info
98 */
99static int parse_reply_info_in(void **p, void *end,
100 struct ceph_mds_reply_info_in *info,
101 u64 features)
102{
103 int err = 0;
104 u8 struct_v = 0;
105
106 if (features == (u64)-1) {
107 u32 struct_len;
108 u8 struct_compat;
109 ceph_decode_8_safe(p, end, struct_v, bad);
110 ceph_decode_8_safe(p, end, struct_compat, bad);
111 /* struct_v is expected to be >= 1. we only understand
112 * encoding with struct_compat == 1. */
113 if (!struct_v || struct_compat != 1)
114 goto bad;
115 ceph_decode_32_safe(p, end, struct_len, bad);
116 ceph_decode_need(p, end, struct_len, bad);
117 end = *p + struct_len;
118 }
119
120 ceph_decode_need(p, end, sizeof(struct ceph_mds_reply_inode), bad);
121 info->in = *p;
122 *p += sizeof(struct ceph_mds_reply_inode) +
123 sizeof(*info->in->fragtree.splits) *
124 le32_to_cpu(info->in->fragtree.nsplits);
125
126 ceph_decode_32_safe(p, end, info->symlink_len, bad);
127 ceph_decode_need(p, end, info->symlink_len, bad);
128 info->symlink = *p;
129 *p += info->symlink_len;
130
131 ceph_decode_copy_safe(p, end, &info->dir_layout,
132 sizeof(info->dir_layout), bad);
133 ceph_decode_32_safe(p, end, info->xattr_len, bad);
134 ceph_decode_need(p, end, info->xattr_len, bad);
135 info->xattr_data = *p;
136 *p += info->xattr_len;
137
138 if (features == (u64)-1) {
139 /* inline data */
140 ceph_decode_64_safe(p, end, info->inline_version, bad);
141 ceph_decode_32_safe(p, end, info->inline_len, bad);
142 ceph_decode_need(p, end, info->inline_len, bad);
143 info->inline_data = *p;
144 *p += info->inline_len;
145 /* quota */
146 err = parse_reply_info_quota(p, end, info);
147 if (err < 0)
148 goto out_bad;
149 /* pool namespace */
150 ceph_decode_32_safe(p, end, info->pool_ns_len, bad);
151 if (info->pool_ns_len > 0) {
152 ceph_decode_need(p, end, info->pool_ns_len, bad);
153 info->pool_ns_data = *p;
154 *p += info->pool_ns_len;
155 }
156
157 /* btime */
158 ceph_decode_need(p, end, sizeof(info->btime), bad);
159 ceph_decode_copy(p, &info->btime, sizeof(info->btime));
160
161 /* change attribute */
162 ceph_decode_64_safe(p, end, info->change_attr, bad);
163
164 /* dir pin */
165 if (struct_v >= 2) {
166 ceph_decode_32_safe(p, end, info->dir_pin, bad);
167 } else {
168 info->dir_pin = -ENODATA;
169 }
170
171 /* snapshot birth time, remains zero for v<=2 */
172 if (struct_v >= 3) {
173 ceph_decode_need(p, end, sizeof(info->snap_btime), bad);
174 ceph_decode_copy(p, &info->snap_btime,
175 sizeof(info->snap_btime));
176 } else {
177 memset(&info->snap_btime, 0, sizeof(info->snap_btime));
178 }
179
180 /* snapshot count, remains zero for v<=3 */
181 if (struct_v >= 4) {
182 ceph_decode_64_safe(p, end, info->rsnaps, bad);
183 } else {
184 info->rsnaps = 0;
185 }
186
187 *p = end;
188 } else {
189 if (features & CEPH_FEATURE_MDS_INLINE_DATA) {
190 ceph_decode_64_safe(p, end, info->inline_version, bad);
191 ceph_decode_32_safe(p, end, info->inline_len, bad);
192 ceph_decode_need(p, end, info->inline_len, bad);
193 info->inline_data = *p;
194 *p += info->inline_len;
195 } else
196 info->inline_version = CEPH_INLINE_NONE;
197
198 if (features & CEPH_FEATURE_MDS_QUOTA) {
199 err = parse_reply_info_quota(p, end, info);
200 if (err < 0)
201 goto out_bad;
202 } else {
203 info->max_bytes = 0;
204 info->max_files = 0;
205 }
206
207 info->pool_ns_len = 0;
208 info->pool_ns_data = NULL;
209 if (features & CEPH_FEATURE_FS_FILE_LAYOUT_V2) {
210 ceph_decode_32_safe(p, end, info->pool_ns_len, bad);
211 if (info->pool_ns_len > 0) {
212 ceph_decode_need(p, end, info->pool_ns_len, bad);
213 info->pool_ns_data = *p;
214 *p += info->pool_ns_len;
215 }
216 }
217
218 if (features & CEPH_FEATURE_FS_BTIME) {
219 ceph_decode_need(p, end, sizeof(info->btime), bad);
220 ceph_decode_copy(p, &info->btime, sizeof(info->btime));
221 ceph_decode_64_safe(p, end, info->change_attr, bad);
222 }
223
224 info->dir_pin = -ENODATA;
225 /* info->snap_btime and info->rsnaps remain zero */
226 }
227 return 0;
228bad:
229 err = -EIO;
230out_bad:
231 return err;
232}
233
234static int parse_reply_info_dir(void **p, void *end,
235 struct ceph_mds_reply_dirfrag **dirfrag,
236 u64 features)
237{
238 if (features == (u64)-1) {
239 u8 struct_v, struct_compat;
240 u32 struct_len;
241 ceph_decode_8_safe(p, end, struct_v, bad);
242 ceph_decode_8_safe(p, end, struct_compat, bad);
243 /* struct_v is expected to be >= 1. we only understand
244 * encoding whose struct_compat == 1. */
245 if (!struct_v || struct_compat != 1)
246 goto bad;
247 ceph_decode_32_safe(p, end, struct_len, bad);
248 ceph_decode_need(p, end, struct_len, bad);
249 end = *p + struct_len;
250 }
251
252 ceph_decode_need(p, end, sizeof(**dirfrag), bad);
253 *dirfrag = *p;
254 *p += sizeof(**dirfrag) + sizeof(u32) * le32_to_cpu((*dirfrag)->ndist);
255 if (unlikely(*p > end))
256 goto bad;
257 if (features == (u64)-1)
258 *p = end;
259 return 0;
260bad:
261 return -EIO;
262}
263
264static int parse_reply_info_lease(void **p, void *end,
265 struct ceph_mds_reply_lease **lease,
266 u64 features)
267{
268 if (features == (u64)-1) {
269 u8 struct_v, struct_compat;
270 u32 struct_len;
271 ceph_decode_8_safe(p, end, struct_v, bad);
272 ceph_decode_8_safe(p, end, struct_compat, bad);
273 /* struct_v is expected to be >= 1. we only understand
274 * encoding whose struct_compat == 1. */
275 if (!struct_v || struct_compat != 1)
276 goto bad;
277 ceph_decode_32_safe(p, end, struct_len, bad);
278 ceph_decode_need(p, end, struct_len, bad);
279 end = *p + struct_len;
280 }
281
282 ceph_decode_need(p, end, sizeof(**lease), bad);
283 *lease = *p;
284 *p += sizeof(**lease);
285 if (features == (u64)-1)
286 *p = end;
287 return 0;
288bad:
289 return -EIO;
290}
291
292/*
293 * parse a normal reply, which may contain a (dir+)dentry and/or a
294 * target inode.
295 */
296static int parse_reply_info_trace(void **p, void *end,
297 struct ceph_mds_reply_info_parsed *info,
298 u64 features)
299{
300 int err;
301
302 if (info->head->is_dentry) {
303 err = parse_reply_info_in(p, end, &info->diri, features);
304 if (err < 0)
305 goto out_bad;
306
307 err = parse_reply_info_dir(p, end, &info->dirfrag, features);
308 if (err < 0)
309 goto out_bad;
310
311 ceph_decode_32_safe(p, end, info->dname_len, bad);
312 ceph_decode_need(p, end, info->dname_len, bad);
313 info->dname = *p;
314 *p += info->dname_len;
315
316 err = parse_reply_info_lease(p, end, &info->dlease, features);
317 if (err < 0)
318 goto out_bad;
319 }
320
321 if (info->head->is_target) {
322 err = parse_reply_info_in(p, end, &info->targeti, features);
323 if (err < 0)
324 goto out_bad;
325 }
326
327 if (unlikely(*p != end))
328 goto bad;
329 return 0;
330
331bad:
332 err = -EIO;
333out_bad:
334 pr_err("problem parsing mds trace %d\n", err);
335 return err;
336}
337
338/*
339 * parse readdir results
340 */
341static int parse_reply_info_readdir(void **p, void *end,
342 struct ceph_mds_reply_info_parsed *info,
343 u64 features)
344{
345 u32 num, i = 0;
346 int err;
347
348 err = parse_reply_info_dir(p, end, &info->dir_dir, features);
349 if (err < 0)
350 goto out_bad;
351
352 ceph_decode_need(p, end, sizeof(num) + 2, bad);
353 num = ceph_decode_32(p);
354 {
355 u16 flags = ceph_decode_16(p);
356 info->dir_end = !!(flags & CEPH_READDIR_FRAG_END);
357 info->dir_complete = !!(flags & CEPH_READDIR_FRAG_COMPLETE);
358 info->hash_order = !!(flags & CEPH_READDIR_HASH_ORDER);
359 info->offset_hash = !!(flags & CEPH_READDIR_OFFSET_HASH);
360 }
361 if (num == 0)
362 goto done;
363
364 BUG_ON(!info->dir_entries);
365 if ((unsigned long)(info->dir_entries + num) >
366 (unsigned long)info->dir_entries + info->dir_buf_size) {
367 pr_err("dir contents are larger than expected\n");
368 WARN_ON(1);
369 goto bad;
370 }
371
372 info->dir_nr = num;
373 while (num) {
374 struct ceph_mds_reply_dir_entry *rde = info->dir_entries + i;
375 /* dentry */
376 ceph_decode_32_safe(p, end, rde->name_len, bad);
377 ceph_decode_need(p, end, rde->name_len, bad);
378 rde->name = *p;
379 *p += rde->name_len;
380 dout("parsed dir dname '%.*s'\n", rde->name_len, rde->name);
381
382 /* dentry lease */
383 err = parse_reply_info_lease(p, end, &rde->lease, features);
384 if (err)
385 goto out_bad;
386 /* inode */
387 err = parse_reply_info_in(p, end, &rde->inode, features);
388 if (err < 0)
389 goto out_bad;
390 /* ceph_readdir_prepopulate() will update it */
391 rde->offset = 0;
392 i++;
393 num--;
394 }
395
396done:
397 /* Skip over any unrecognized fields */
398 *p = end;
399 return 0;
400
401bad:
402 err = -EIO;
403out_bad:
404 pr_err("problem parsing dir contents %d\n", err);
405 return err;
406}
407
408/*
409 * parse fcntl F_GETLK results
410 */
411static int parse_reply_info_filelock(void **p, void *end,
412 struct ceph_mds_reply_info_parsed *info,
413 u64 features)
414{
415 if (*p + sizeof(*info->filelock_reply) > end)
416 goto bad;
417
418 info->filelock_reply = *p;
419
420 /* Skip over any unrecognized fields */
421 *p = end;
422 return 0;
423bad:
424 return -EIO;
425}
426
427
428#if BITS_PER_LONG == 64
429
430#define DELEGATED_INO_AVAILABLE xa_mk_value(1)
431
432static int ceph_parse_deleg_inos(void **p, void *end,
433 struct ceph_mds_session *s)
434{
435 u32 sets;
436
437 ceph_decode_32_safe(p, end, sets, bad);
438 dout("got %u sets of delegated inodes\n", sets);
439 while (sets--) {
440 u64 start, len;
441
442 ceph_decode_64_safe(p, end, start, bad);
443 ceph_decode_64_safe(p, end, len, bad);
444
445 /* Don't accept a delegation of system inodes */
446 if (start < CEPH_INO_SYSTEM_BASE) {
447 pr_warn_ratelimited("ceph: ignoring reserved inode range delegation (start=0x%llx len=0x%llx)\n",
448 start, len);
449 continue;
450 }
451 while (len--) {
452 int err = xa_insert(&s->s_delegated_inos, start++,
453 DELEGATED_INO_AVAILABLE,
454 GFP_KERNEL);
455 if (!err) {
456 dout("added delegated inode 0x%llx\n",
457 start - 1);
458 } else if (err == -EBUSY) {
459 pr_warn("MDS delegated inode 0x%llx more than once.\n",
460 start - 1);
461 } else {
462 return err;
463 }
464 }
465 }
466 return 0;
467bad:
468 return -EIO;
469}
470
471u64 ceph_get_deleg_ino(struct ceph_mds_session *s)
472{
473 unsigned long ino;
474 void *val;
475
476 xa_for_each(&s->s_delegated_inos, ino, val) {
477 val = xa_erase(&s->s_delegated_inos, ino);
478 if (val == DELEGATED_INO_AVAILABLE)
479 return ino;
480 }
481 return 0;
482}
483
484int ceph_restore_deleg_ino(struct ceph_mds_session *s, u64 ino)
485{
486 return xa_insert(&s->s_delegated_inos, ino, DELEGATED_INO_AVAILABLE,
487 GFP_KERNEL);
488}
489#else /* BITS_PER_LONG == 64 */
490/*
491 * FIXME: xarrays can't handle 64-bit indexes on a 32-bit arch. For now, just
492 * ignore delegated_inos on 32 bit arch. Maybe eventually add xarrays for top
493 * and bottom words?
494 */
495static int ceph_parse_deleg_inos(void **p, void *end,
496 struct ceph_mds_session *s)
497{
498 u32 sets;
499
500 ceph_decode_32_safe(p, end, sets, bad);
501 if (sets)
502 ceph_decode_skip_n(p, end, sets * 2 * sizeof(__le64), bad);
503 return 0;
504bad:
505 return -EIO;
506}
507
508u64 ceph_get_deleg_ino(struct ceph_mds_session *s)
509{
510 return 0;
511}
512
513int ceph_restore_deleg_ino(struct ceph_mds_session *s, u64 ino)
514{
515 return 0;
516}
517#endif /* BITS_PER_LONG == 64 */
518
519/*
520 * parse create results
521 */
522static int parse_reply_info_create(void **p, void *end,
523 struct ceph_mds_reply_info_parsed *info,
524 u64 features, struct ceph_mds_session *s)
525{
526 int ret;
527
528 if (features == (u64)-1 ||
529 (features & CEPH_FEATURE_REPLY_CREATE_INODE)) {
530 if (*p == end) {
531 /* Malformed reply? */
532 info->has_create_ino = false;
533 } else if (test_bit(CEPHFS_FEATURE_DELEG_INO, &s->s_features)) {
534 info->has_create_ino = true;
535 /* struct_v, struct_compat, and len */
536 ceph_decode_skip_n(p, end, 2 + sizeof(u32), bad);
537 ceph_decode_64_safe(p, end, info->ino, bad);
538 ret = ceph_parse_deleg_inos(p, end, s);
539 if (ret)
540 return ret;
541 } else {
542 /* legacy */
543 ceph_decode_64_safe(p, end, info->ino, bad);
544 info->has_create_ino = true;
545 }
546 } else {
547 if (*p != end)
548 goto bad;
549 }
550
551 /* Skip over any unrecognized fields */
552 *p = end;
553 return 0;
554bad:
555 return -EIO;
556}
557
558static int parse_reply_info_getvxattr(void **p, void *end,
559 struct ceph_mds_reply_info_parsed *info,
560 u64 features)
561{
562 u32 value_len;
563
564 ceph_decode_skip_8(p, end, bad); /* skip current version: 1 */
565 ceph_decode_skip_8(p, end, bad); /* skip first version: 1 */
566 ceph_decode_skip_32(p, end, bad); /* skip payload length */
567
568 ceph_decode_32_safe(p, end, value_len, bad);
569
570 if (value_len == end - *p) {
571 info->xattr_info.xattr_value = *p;
572 info->xattr_info.xattr_value_len = value_len;
573 *p = end;
574 return value_len;
575 }
576bad:
577 return -EIO;
578}
579
580/*
581 * parse extra results
582 */
583static int parse_reply_info_extra(void **p, void *end,
584 struct ceph_mds_reply_info_parsed *info,
585 u64 features, struct ceph_mds_session *s)
586{
587 u32 op = le32_to_cpu(info->head->op);
588
589 if (op == CEPH_MDS_OP_GETFILELOCK)
590 return parse_reply_info_filelock(p, end, info, features);
591 else if (op == CEPH_MDS_OP_READDIR || op == CEPH_MDS_OP_LSSNAP)
592 return parse_reply_info_readdir(p, end, info, features);
593 else if (op == CEPH_MDS_OP_CREATE)
594 return parse_reply_info_create(p, end, info, features, s);
595 else if (op == CEPH_MDS_OP_GETVXATTR)
596 return parse_reply_info_getvxattr(p, end, info, features);
597 else
598 return -EIO;
599}
600
601/*
602 * parse entire mds reply
603 */
604static int parse_reply_info(struct ceph_mds_session *s, struct ceph_msg *msg,
605 struct ceph_mds_reply_info_parsed *info,
606 u64 features)
607{
608 void *p, *end;
609 u32 len;
610 int err;
611
612 info->head = msg->front.iov_base;
613 p = msg->front.iov_base + sizeof(struct ceph_mds_reply_head);
614 end = p + msg->front.iov_len - sizeof(struct ceph_mds_reply_head);
615
616 /* trace */
617 ceph_decode_32_safe(&p, end, len, bad);
618 if (len > 0) {
619 ceph_decode_need(&p, end, len, bad);
620 err = parse_reply_info_trace(&p, p+len, info, features);
621 if (err < 0)
622 goto out_bad;
623 }
624
625 /* extra */
626 ceph_decode_32_safe(&p, end, len, bad);
627 if (len > 0) {
628 ceph_decode_need(&p, end, len, bad);
629 err = parse_reply_info_extra(&p, p+len, info, features, s);
630 if (err < 0)
631 goto out_bad;
632 }
633
634 /* snap blob */
635 ceph_decode_32_safe(&p, end, len, bad);
636 info->snapblob_len = len;
637 info->snapblob = p;
638 p += len;
639
640 if (p != end)
641 goto bad;
642 return 0;
643
644bad:
645 err = -EIO;
646out_bad:
647 pr_err("mds parse_reply err %d\n", err);
648 return err;
649}
650
651static void destroy_reply_info(struct ceph_mds_reply_info_parsed *info)
652{
653 if (!info->dir_entries)
654 return;
655 free_pages((unsigned long)info->dir_entries, get_order(info->dir_buf_size));
656}
657
658/*
659 * In async unlink case the kclient won't wait for the first reply
660 * from MDS and just drop all the links and unhash the dentry and then
661 * succeeds immediately.
662 *
663 * For any new create/link/rename,etc requests followed by using the
664 * same file names we must wait for the first reply of the inflight
665 * unlink request, or the MDS possibly will fail these following
666 * requests with -EEXIST if the inflight async unlink request was
667 * delayed for some reasons.
668 *
669 * And the worst case is that for the none async openc request it will
670 * successfully open the file if the CDentry hasn't been unlinked yet,
671 * but later the previous delayed async unlink request will remove the
672 * CDenty. That means the just created file is possiblly deleted later
673 * by accident.
674 *
675 * We need to wait for the inflight async unlink requests to finish
676 * when creating new files/directories by using the same file names.
677 */
678int ceph_wait_on_conflict_unlink(struct dentry *dentry)
679{
680 struct ceph_fs_client *fsc = ceph_sb_to_client(dentry->d_sb);
681 struct dentry *pdentry = dentry->d_parent;
682 struct dentry *udentry, *found = NULL;
683 struct ceph_dentry_info *di;
684 struct qstr dname;
685 u32 hash = dentry->d_name.hash;
686 int err;
687
688 dname.name = dentry->d_name.name;
689 dname.len = dentry->d_name.len;
690
691 rcu_read_lock();
692 hash_for_each_possible_rcu(fsc->async_unlink_conflict, di,
693 hnode, hash) {
694 udentry = di->dentry;
695
696 spin_lock(&udentry->d_lock);
697 if (udentry->d_name.hash != hash)
698 goto next;
699 if (unlikely(udentry->d_parent != pdentry))
700 goto next;
701 if (!hash_hashed(&di->hnode))
702 goto next;
703
704 if (!test_bit(CEPH_DENTRY_ASYNC_UNLINK_BIT, &di->flags))
705 pr_warn("%s dentry %p:%pd async unlink bit is not set\n",
706 __func__, dentry, dentry);
707
708 if (!d_same_name(udentry, pdentry, &dname))
709 goto next;
710
711 spin_unlock(&udentry->d_lock);
712 found = dget(udentry);
713 break;
714next:
715 spin_unlock(&udentry->d_lock);
716 }
717 rcu_read_unlock();
718
719 if (likely(!found))
720 return 0;
721
722 dout("%s dentry %p:%pd conflict with old %p:%pd\n", __func__,
723 dentry, dentry, found, found);
724
725 err = wait_on_bit(&di->flags, CEPH_DENTRY_ASYNC_UNLINK_BIT,
726 TASK_KILLABLE);
727 dput(found);
728 return err;
729}
730
731
732/*
733 * sessions
734 */
735const char *ceph_session_state_name(int s)
736{
737 switch (s) {
738 case CEPH_MDS_SESSION_NEW: return "new";
739 case CEPH_MDS_SESSION_OPENING: return "opening";
740 case CEPH_MDS_SESSION_OPEN: return "open";
741 case CEPH_MDS_SESSION_HUNG: return "hung";
742 case CEPH_MDS_SESSION_CLOSING: return "closing";
743 case CEPH_MDS_SESSION_CLOSED: return "closed";
744 case CEPH_MDS_SESSION_RESTARTING: return "restarting";
745 case CEPH_MDS_SESSION_RECONNECTING: return "reconnecting";
746 case CEPH_MDS_SESSION_REJECTED: return "rejected";
747 default: return "???";
748 }
749}
750
751struct ceph_mds_session *ceph_get_mds_session(struct ceph_mds_session *s)
752{
753 if (refcount_inc_not_zero(&s->s_ref))
754 return s;
755 return NULL;
756}
757
758void ceph_put_mds_session(struct ceph_mds_session *s)
759{
760 if (IS_ERR_OR_NULL(s))
761 return;
762
763 if (refcount_dec_and_test(&s->s_ref)) {
764 if (s->s_auth.authorizer)
765 ceph_auth_destroy_authorizer(s->s_auth.authorizer);
766 WARN_ON(mutex_is_locked(&s->s_mutex));
767 xa_destroy(&s->s_delegated_inos);
768 kfree(s);
769 }
770}
771
772/*
773 * called under mdsc->mutex
774 */
775struct ceph_mds_session *__ceph_lookup_mds_session(struct ceph_mds_client *mdsc,
776 int mds)
777{
778 if (mds >= mdsc->max_sessions || !mdsc->sessions[mds])
779 return NULL;
780 return ceph_get_mds_session(mdsc->sessions[mds]);
781}
782
783static bool __have_session(struct ceph_mds_client *mdsc, int mds)
784{
785 if (mds >= mdsc->max_sessions || !mdsc->sessions[mds])
786 return false;
787 else
788 return true;
789}
790
791static int __verify_registered_session(struct ceph_mds_client *mdsc,
792 struct ceph_mds_session *s)
793{
794 if (s->s_mds >= mdsc->max_sessions ||
795 mdsc->sessions[s->s_mds] != s)
796 return -ENOENT;
797 return 0;
798}
799
800/*
801 * create+register a new session for given mds.
802 * called under mdsc->mutex.
803 */
804static struct ceph_mds_session *register_session(struct ceph_mds_client *mdsc,
805 int mds)
806{
807 struct ceph_mds_session *s;
808
809 if (READ_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_FENCE_IO)
810 return ERR_PTR(-EIO);
811
812 if (mds >= mdsc->mdsmap->possible_max_rank)
813 return ERR_PTR(-EINVAL);
814
815 s = kzalloc(sizeof(*s), GFP_NOFS);
816 if (!s)
817 return ERR_PTR(-ENOMEM);
818
819 if (mds >= mdsc->max_sessions) {
820 int newmax = 1 << get_count_order(mds + 1);
821 struct ceph_mds_session **sa;
822
823 dout("%s: realloc to %d\n", __func__, newmax);
824 sa = kcalloc(newmax, sizeof(void *), GFP_NOFS);
825 if (!sa)
826 goto fail_realloc;
827 if (mdsc->sessions) {
828 memcpy(sa, mdsc->sessions,
829 mdsc->max_sessions * sizeof(void *));
830 kfree(mdsc->sessions);
831 }
832 mdsc->sessions = sa;
833 mdsc->max_sessions = newmax;
834 }
835
836 dout("%s: mds%d\n", __func__, mds);
837 s->s_mdsc = mdsc;
838 s->s_mds = mds;
839 s->s_state = CEPH_MDS_SESSION_NEW;
840 mutex_init(&s->s_mutex);
841
842 ceph_con_init(&s->s_con, s, &mds_con_ops, &mdsc->fsc->client->msgr);
843
844 atomic_set(&s->s_cap_gen, 1);
845 s->s_cap_ttl = jiffies - 1;
846
847 spin_lock_init(&s->s_cap_lock);
848 INIT_LIST_HEAD(&s->s_caps);
849 refcount_set(&s->s_ref, 1);
850 INIT_LIST_HEAD(&s->s_waiting);
851 INIT_LIST_HEAD(&s->s_unsafe);
852 xa_init(&s->s_delegated_inos);
853 INIT_LIST_HEAD(&s->s_cap_releases);
854 INIT_WORK(&s->s_cap_release_work, ceph_cap_release_work);
855
856 INIT_LIST_HEAD(&s->s_cap_dirty);
857 INIT_LIST_HEAD(&s->s_cap_flushing);
858
859 mdsc->sessions[mds] = s;
860 atomic_inc(&mdsc->num_sessions);
861 refcount_inc(&s->s_ref); /* one ref to sessions[], one to caller */
862
863 ceph_con_open(&s->s_con, CEPH_ENTITY_TYPE_MDS, mds,
864 ceph_mdsmap_get_addr(mdsc->mdsmap, mds));
865
866 return s;
867
868fail_realloc:
869 kfree(s);
870 return ERR_PTR(-ENOMEM);
871}
872
873/*
874 * called under mdsc->mutex
875 */
876static void __unregister_session(struct ceph_mds_client *mdsc,
877 struct ceph_mds_session *s)
878{
879 dout("__unregister_session mds%d %p\n", s->s_mds, s);
880 BUG_ON(mdsc->sessions[s->s_mds] != s);
881 mdsc->sessions[s->s_mds] = NULL;
882 ceph_con_close(&s->s_con);
883 ceph_put_mds_session(s);
884 atomic_dec(&mdsc->num_sessions);
885}
886
887/*
888 * drop session refs in request.
889 *
890 * should be last request ref, or hold mdsc->mutex
891 */
892static void put_request_session(struct ceph_mds_request *req)
893{
894 if (req->r_session) {
895 ceph_put_mds_session(req->r_session);
896 req->r_session = NULL;
897 }
898}
899
900void ceph_mdsc_iterate_sessions(struct ceph_mds_client *mdsc,
901 void (*cb)(struct ceph_mds_session *),
902 bool check_state)
903{
904 int mds;
905
906 mutex_lock(&mdsc->mutex);
907 for (mds = 0; mds < mdsc->max_sessions; ++mds) {
908 struct ceph_mds_session *s;
909
910 s = __ceph_lookup_mds_session(mdsc, mds);
911 if (!s)
912 continue;
913
914 if (check_state && !check_session_state(s)) {
915 ceph_put_mds_session(s);
916 continue;
917 }
918
919 mutex_unlock(&mdsc->mutex);
920 cb(s);
921 ceph_put_mds_session(s);
922 mutex_lock(&mdsc->mutex);
923 }
924 mutex_unlock(&mdsc->mutex);
925}
926
927void ceph_mdsc_release_request(struct kref *kref)
928{
929 struct ceph_mds_request *req = container_of(kref,
930 struct ceph_mds_request,
931 r_kref);
932 ceph_mdsc_release_dir_caps_no_check(req);
933 destroy_reply_info(&req->r_reply_info);
934 if (req->r_request)
935 ceph_msg_put(req->r_request);
936 if (req->r_reply)
937 ceph_msg_put(req->r_reply);
938 if (req->r_inode) {
939 ceph_put_cap_refs(ceph_inode(req->r_inode), CEPH_CAP_PIN);
940 iput(req->r_inode);
941 }
942 if (req->r_parent) {
943 ceph_put_cap_refs(ceph_inode(req->r_parent), CEPH_CAP_PIN);
944 iput(req->r_parent);
945 }
946 iput(req->r_target_inode);
947 if (req->r_dentry)
948 dput(req->r_dentry);
949 if (req->r_old_dentry)
950 dput(req->r_old_dentry);
951 if (req->r_old_dentry_dir) {
952 /*
953 * track (and drop pins for) r_old_dentry_dir
954 * separately, since r_old_dentry's d_parent may have
955 * changed between the dir mutex being dropped and
956 * this request being freed.
957 */
958 ceph_put_cap_refs(ceph_inode(req->r_old_dentry_dir),
959 CEPH_CAP_PIN);
960 iput(req->r_old_dentry_dir);
961 }
962 kfree(req->r_path1);
963 kfree(req->r_path2);
964 put_cred(req->r_cred);
965 if (req->r_pagelist)
966 ceph_pagelist_release(req->r_pagelist);
967 put_request_session(req);
968 ceph_unreserve_caps(req->r_mdsc, &req->r_caps_reservation);
969 WARN_ON_ONCE(!list_empty(&req->r_wait));
970 kmem_cache_free(ceph_mds_request_cachep, req);
971}
972
973DEFINE_RB_FUNCS(request, struct ceph_mds_request, r_tid, r_node)
974
975/*
976 * lookup session, bump ref if found.
977 *
978 * called under mdsc->mutex.
979 */
980static struct ceph_mds_request *
981lookup_get_request(struct ceph_mds_client *mdsc, u64 tid)
982{
983 struct ceph_mds_request *req;
984
985 req = lookup_request(&mdsc->request_tree, tid);
986 if (req)
987 ceph_mdsc_get_request(req);
988
989 return req;
990}
991
992/*
993 * Register an in-flight request, and assign a tid. Link to directory
994 * are modifying (if any).
995 *
996 * Called under mdsc->mutex.
997 */
998static void __register_request(struct ceph_mds_client *mdsc,
999 struct ceph_mds_request *req,
1000 struct inode *dir)
1001{
1002 int ret = 0;
1003
1004 req->r_tid = ++mdsc->last_tid;
1005 if (req->r_num_caps) {
1006 ret = ceph_reserve_caps(mdsc, &req->r_caps_reservation,
1007 req->r_num_caps);
1008 if (ret < 0) {
1009 pr_err("__register_request %p "
1010 "failed to reserve caps: %d\n", req, ret);
1011 /* set req->r_err to fail early from __do_request */
1012 req->r_err = ret;
1013 return;
1014 }
1015 }
1016 dout("__register_request %p tid %lld\n", req, req->r_tid);
1017 ceph_mdsc_get_request(req);
1018 insert_request(&mdsc->request_tree, req);
1019
1020 req->r_cred = get_current_cred();
1021
1022 if (mdsc->oldest_tid == 0 && req->r_op != CEPH_MDS_OP_SETFILELOCK)
1023 mdsc->oldest_tid = req->r_tid;
1024
1025 if (dir) {
1026 struct ceph_inode_info *ci = ceph_inode(dir);
1027
1028 ihold(dir);
1029 req->r_unsafe_dir = dir;
1030 spin_lock(&ci->i_unsafe_lock);
1031 list_add_tail(&req->r_unsafe_dir_item, &ci->i_unsafe_dirops);
1032 spin_unlock(&ci->i_unsafe_lock);
1033 }
1034}
1035
1036static void __unregister_request(struct ceph_mds_client *mdsc,
1037 struct ceph_mds_request *req)
1038{
1039 dout("__unregister_request %p tid %lld\n", req, req->r_tid);
1040
1041 /* Never leave an unregistered request on an unsafe list! */
1042 list_del_init(&req->r_unsafe_item);
1043
1044 if (req->r_tid == mdsc->oldest_tid) {
1045 struct rb_node *p = rb_next(&req->r_node);
1046 mdsc->oldest_tid = 0;
1047 while (p) {
1048 struct ceph_mds_request *next_req =
1049 rb_entry(p, struct ceph_mds_request, r_node);
1050 if (next_req->r_op != CEPH_MDS_OP_SETFILELOCK) {
1051 mdsc->oldest_tid = next_req->r_tid;
1052 break;
1053 }
1054 p = rb_next(p);
1055 }
1056 }
1057
1058 erase_request(&mdsc->request_tree, req);
1059
1060 if (req->r_unsafe_dir) {
1061 struct ceph_inode_info *ci = ceph_inode(req->r_unsafe_dir);
1062 spin_lock(&ci->i_unsafe_lock);
1063 list_del_init(&req->r_unsafe_dir_item);
1064 spin_unlock(&ci->i_unsafe_lock);
1065 }
1066 if (req->r_target_inode &&
1067 test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) {
1068 struct ceph_inode_info *ci = ceph_inode(req->r_target_inode);
1069 spin_lock(&ci->i_unsafe_lock);
1070 list_del_init(&req->r_unsafe_target_item);
1071 spin_unlock(&ci->i_unsafe_lock);
1072 }
1073
1074 if (req->r_unsafe_dir) {
1075 iput(req->r_unsafe_dir);
1076 req->r_unsafe_dir = NULL;
1077 }
1078
1079 complete_all(&req->r_safe_completion);
1080
1081 ceph_mdsc_put_request(req);
1082}
1083
1084/*
1085 * Walk back up the dentry tree until we hit a dentry representing a
1086 * non-snapshot inode. We do this using the rcu_read_lock (which must be held
1087 * when calling this) to ensure that the objects won't disappear while we're
1088 * working with them. Once we hit a candidate dentry, we attempt to take a
1089 * reference to it, and return that as the result.
1090 */
1091static struct inode *get_nonsnap_parent(struct dentry *dentry)
1092{
1093 struct inode *inode = NULL;
1094
1095 while (dentry && !IS_ROOT(dentry)) {
1096 inode = d_inode_rcu(dentry);
1097 if (!inode || ceph_snap(inode) == CEPH_NOSNAP)
1098 break;
1099 dentry = dentry->d_parent;
1100 }
1101 if (inode)
1102 inode = igrab(inode);
1103 return inode;
1104}
1105
1106/*
1107 * Choose mds to send request to next. If there is a hint set in the
1108 * request (e.g., due to a prior forward hint from the mds), use that.
1109 * Otherwise, consult frag tree and/or caps to identify the
1110 * appropriate mds. If all else fails, choose randomly.
1111 *
1112 * Called under mdsc->mutex.
1113 */
1114static int __choose_mds(struct ceph_mds_client *mdsc,
1115 struct ceph_mds_request *req,
1116 bool *random)
1117{
1118 struct inode *inode;
1119 struct ceph_inode_info *ci;
1120 struct ceph_cap *cap;
1121 int mode = req->r_direct_mode;
1122 int mds = -1;
1123 u32 hash = req->r_direct_hash;
1124 bool is_hash = test_bit(CEPH_MDS_R_DIRECT_IS_HASH, &req->r_req_flags);
1125
1126 if (random)
1127 *random = false;
1128
1129 /*
1130 * is there a specific mds we should try? ignore hint if we have
1131 * no session and the mds is not up (active or recovering).
1132 */
1133 if (req->r_resend_mds >= 0 &&
1134 (__have_session(mdsc, req->r_resend_mds) ||
1135 ceph_mdsmap_get_state(mdsc->mdsmap, req->r_resend_mds) > 0)) {
1136 dout("%s using resend_mds mds%d\n", __func__,
1137 req->r_resend_mds);
1138 return req->r_resend_mds;
1139 }
1140
1141 if (mode == USE_RANDOM_MDS)
1142 goto random;
1143
1144 inode = NULL;
1145 if (req->r_inode) {
1146 if (ceph_snap(req->r_inode) != CEPH_SNAPDIR) {
1147 inode = req->r_inode;
1148 ihold(inode);
1149 } else {
1150 /* req->r_dentry is non-null for LSSNAP request */
1151 rcu_read_lock();
1152 inode = get_nonsnap_parent(req->r_dentry);
1153 rcu_read_unlock();
1154 dout("%s using snapdir's parent %p\n", __func__, inode);
1155 }
1156 } else if (req->r_dentry) {
1157 /* ignore race with rename; old or new d_parent is okay */
1158 struct dentry *parent;
1159 struct inode *dir;
1160
1161 rcu_read_lock();
1162 parent = READ_ONCE(req->r_dentry->d_parent);
1163 dir = req->r_parent ? : d_inode_rcu(parent);
1164
1165 if (!dir || dir->i_sb != mdsc->fsc->sb) {
1166 /* not this fs or parent went negative */
1167 inode = d_inode(req->r_dentry);
1168 if (inode)
1169 ihold(inode);
1170 } else if (ceph_snap(dir) != CEPH_NOSNAP) {
1171 /* direct snapped/virtual snapdir requests
1172 * based on parent dir inode */
1173 inode = get_nonsnap_parent(parent);
1174 dout("%s using nonsnap parent %p\n", __func__, inode);
1175 } else {
1176 /* dentry target */
1177 inode = d_inode(req->r_dentry);
1178 if (!inode || mode == USE_AUTH_MDS) {
1179 /* dir + name */
1180 inode = igrab(dir);
1181 hash = ceph_dentry_hash(dir, req->r_dentry);
1182 is_hash = true;
1183 } else {
1184 ihold(inode);
1185 }
1186 }
1187 rcu_read_unlock();
1188 }
1189
1190 dout("%s %p is_hash=%d (0x%x) mode %d\n", __func__, inode, (int)is_hash,
1191 hash, mode);
1192 if (!inode)
1193 goto random;
1194 ci = ceph_inode(inode);
1195
1196 if (is_hash && S_ISDIR(inode->i_mode)) {
1197 struct ceph_inode_frag frag;
1198 int found;
1199
1200 ceph_choose_frag(ci, hash, &frag, &found);
1201 if (found) {
1202 if (mode == USE_ANY_MDS && frag.ndist > 0) {
1203 u8 r;
1204
1205 /* choose a random replica */
1206 get_random_bytes(&r, 1);
1207 r %= frag.ndist;
1208 mds = frag.dist[r];
1209 dout("%s %p %llx.%llx frag %u mds%d (%d/%d)\n",
1210 __func__, inode, ceph_vinop(inode),
1211 frag.frag, mds, (int)r, frag.ndist);
1212 if (ceph_mdsmap_get_state(mdsc->mdsmap, mds) >=
1213 CEPH_MDS_STATE_ACTIVE &&
1214 !ceph_mdsmap_is_laggy(mdsc->mdsmap, mds))
1215 goto out;
1216 }
1217
1218 /* since this file/dir wasn't known to be
1219 * replicated, then we want to look for the
1220 * authoritative mds. */
1221 if (frag.mds >= 0) {
1222 /* choose auth mds */
1223 mds = frag.mds;
1224 dout("%s %p %llx.%llx frag %u mds%d (auth)\n",
1225 __func__, inode, ceph_vinop(inode),
1226 frag.frag, mds);
1227 if (ceph_mdsmap_get_state(mdsc->mdsmap, mds) >=
1228 CEPH_MDS_STATE_ACTIVE) {
1229 if (!ceph_mdsmap_is_laggy(mdsc->mdsmap,
1230 mds))
1231 goto out;
1232 }
1233 }
1234 mode = USE_AUTH_MDS;
1235 }
1236 }
1237
1238 spin_lock(&ci->i_ceph_lock);
1239 cap = NULL;
1240 if (mode == USE_AUTH_MDS)
1241 cap = ci->i_auth_cap;
1242 if (!cap && !RB_EMPTY_ROOT(&ci->i_caps))
1243 cap = rb_entry(rb_first(&ci->i_caps), struct ceph_cap, ci_node);
1244 if (!cap) {
1245 spin_unlock(&ci->i_ceph_lock);
1246 iput(inode);
1247 goto random;
1248 }
1249 mds = cap->session->s_mds;
1250 dout("%s %p %llx.%llx mds%d (%scap %p)\n", __func__,
1251 inode, ceph_vinop(inode), mds,
1252 cap == ci->i_auth_cap ? "auth " : "", cap);
1253 spin_unlock(&ci->i_ceph_lock);
1254out:
1255 iput(inode);
1256 return mds;
1257
1258random:
1259 if (random)
1260 *random = true;
1261
1262 mds = ceph_mdsmap_get_random_mds(mdsc->mdsmap);
1263 dout("%s chose random mds%d\n", __func__, mds);
1264 return mds;
1265}
1266
1267
1268/*
1269 * session messages
1270 */
1271struct ceph_msg *ceph_create_session_msg(u32 op, u64 seq)
1272{
1273 struct ceph_msg *msg;
1274 struct ceph_mds_session_head *h;
1275
1276 msg = ceph_msg_new(CEPH_MSG_CLIENT_SESSION, sizeof(*h), GFP_NOFS,
1277 false);
1278 if (!msg) {
1279 pr_err("ENOMEM creating session %s msg\n",
1280 ceph_session_op_name(op));
1281 return NULL;
1282 }
1283 h = msg->front.iov_base;
1284 h->op = cpu_to_le32(op);
1285 h->seq = cpu_to_le64(seq);
1286
1287 return msg;
1288}
1289
1290static const unsigned char feature_bits[] = CEPHFS_FEATURES_CLIENT_SUPPORTED;
1291#define FEATURE_BYTES(c) (DIV_ROUND_UP((size_t)feature_bits[c - 1] + 1, 64) * 8)
1292static int encode_supported_features(void **p, void *end)
1293{
1294 static const size_t count = ARRAY_SIZE(feature_bits);
1295
1296 if (count > 0) {
1297 size_t i;
1298 size_t size = FEATURE_BYTES(count);
1299 unsigned long bit;
1300
1301 if (WARN_ON_ONCE(*p + 4 + size > end))
1302 return -ERANGE;
1303
1304 ceph_encode_32(p, size);
1305 memset(*p, 0, size);
1306 for (i = 0; i < count; i++) {
1307 bit = feature_bits[i];
1308 ((unsigned char *)(*p))[bit / 8] |= BIT(bit % 8);
1309 }
1310 *p += size;
1311 } else {
1312 if (WARN_ON_ONCE(*p + 4 > end))
1313 return -ERANGE;
1314
1315 ceph_encode_32(p, 0);
1316 }
1317
1318 return 0;
1319}
1320
1321static const unsigned char metric_bits[] = CEPHFS_METRIC_SPEC_CLIENT_SUPPORTED;
1322#define METRIC_BYTES(cnt) (DIV_ROUND_UP((size_t)metric_bits[cnt - 1] + 1, 64) * 8)
1323static int encode_metric_spec(void **p, void *end)
1324{
1325 static const size_t count = ARRAY_SIZE(metric_bits);
1326
1327 /* header */
1328 if (WARN_ON_ONCE(*p + 2 > end))
1329 return -ERANGE;
1330
1331 ceph_encode_8(p, 1); /* version */
1332 ceph_encode_8(p, 1); /* compat */
1333
1334 if (count > 0) {
1335 size_t i;
1336 size_t size = METRIC_BYTES(count);
1337
1338 if (WARN_ON_ONCE(*p + 4 + 4 + size > end))
1339 return -ERANGE;
1340
1341 /* metric spec info length */
1342 ceph_encode_32(p, 4 + size);
1343
1344 /* metric spec */
1345 ceph_encode_32(p, size);
1346 memset(*p, 0, size);
1347 for (i = 0; i < count; i++)
1348 ((unsigned char *)(*p))[i / 8] |= BIT(metric_bits[i] % 8);
1349 *p += size;
1350 } else {
1351 if (WARN_ON_ONCE(*p + 4 + 4 > end))
1352 return -ERANGE;
1353
1354 /* metric spec info length */
1355 ceph_encode_32(p, 4);
1356 /* metric spec */
1357 ceph_encode_32(p, 0);
1358 }
1359
1360 return 0;
1361}
1362
1363/*
1364 * session message, specialization for CEPH_SESSION_REQUEST_OPEN
1365 * to include additional client metadata fields.
1366 */
1367static struct ceph_msg *create_session_open_msg(struct ceph_mds_client *mdsc, u64 seq)
1368{
1369 struct ceph_msg *msg;
1370 struct ceph_mds_session_head *h;
1371 int i;
1372 int extra_bytes = 0;
1373 int metadata_key_count = 0;
1374 struct ceph_options *opt = mdsc->fsc->client->options;
1375 struct ceph_mount_options *fsopt = mdsc->fsc->mount_options;
1376 size_t size, count;
1377 void *p, *end;
1378 int ret;
1379
1380 const char* metadata[][2] = {
1381 {"hostname", mdsc->nodename},
1382 {"kernel_version", init_utsname()->release},
1383 {"entity_id", opt->name ? : ""},
1384 {"root", fsopt->server_path ? : "/"},
1385 {NULL, NULL}
1386 };
1387
1388 /* Calculate serialized length of metadata */
1389 extra_bytes = 4; /* map length */
1390 for (i = 0; metadata[i][0]; ++i) {
1391 extra_bytes += 8 + strlen(metadata[i][0]) +
1392 strlen(metadata[i][1]);
1393 metadata_key_count++;
1394 }
1395
1396 /* supported feature */
1397 size = 0;
1398 count = ARRAY_SIZE(feature_bits);
1399 if (count > 0)
1400 size = FEATURE_BYTES(count);
1401 extra_bytes += 4 + size;
1402
1403 /* metric spec */
1404 size = 0;
1405 count = ARRAY_SIZE(metric_bits);
1406 if (count > 0)
1407 size = METRIC_BYTES(count);
1408 extra_bytes += 2 + 4 + 4 + size;
1409
1410 /* Allocate the message */
1411 msg = ceph_msg_new(CEPH_MSG_CLIENT_SESSION, sizeof(*h) + extra_bytes,
1412 GFP_NOFS, false);
1413 if (!msg) {
1414 pr_err("ENOMEM creating session open msg\n");
1415 return ERR_PTR(-ENOMEM);
1416 }
1417 p = msg->front.iov_base;
1418 end = p + msg->front.iov_len;
1419
1420 h = p;
1421 h->op = cpu_to_le32(CEPH_SESSION_REQUEST_OPEN);
1422 h->seq = cpu_to_le64(seq);
1423
1424 /*
1425 * Serialize client metadata into waiting buffer space, using
1426 * the format that userspace expects for map<string, string>
1427 *
1428 * ClientSession messages with metadata are v4
1429 */
1430 msg->hdr.version = cpu_to_le16(4);
1431 msg->hdr.compat_version = cpu_to_le16(1);
1432
1433 /* The write pointer, following the session_head structure */
1434 p += sizeof(*h);
1435
1436 /* Number of entries in the map */
1437 ceph_encode_32(&p, metadata_key_count);
1438
1439 /* Two length-prefixed strings for each entry in the map */
1440 for (i = 0; metadata[i][0]; ++i) {
1441 size_t const key_len = strlen(metadata[i][0]);
1442 size_t const val_len = strlen(metadata[i][1]);
1443
1444 ceph_encode_32(&p, key_len);
1445 memcpy(p, metadata[i][0], key_len);
1446 p += key_len;
1447 ceph_encode_32(&p, val_len);
1448 memcpy(p, metadata[i][1], val_len);
1449 p += val_len;
1450 }
1451
1452 ret = encode_supported_features(&p, end);
1453 if (ret) {
1454 pr_err("encode_supported_features failed!\n");
1455 ceph_msg_put(msg);
1456 return ERR_PTR(ret);
1457 }
1458
1459 ret = encode_metric_spec(&p, end);
1460 if (ret) {
1461 pr_err("encode_metric_spec failed!\n");
1462 ceph_msg_put(msg);
1463 return ERR_PTR(ret);
1464 }
1465
1466 msg->front.iov_len = p - msg->front.iov_base;
1467 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
1468
1469 return msg;
1470}
1471
1472/*
1473 * send session open request.
1474 *
1475 * called under mdsc->mutex
1476 */
1477static int __open_session(struct ceph_mds_client *mdsc,
1478 struct ceph_mds_session *session)
1479{
1480 struct ceph_msg *msg;
1481 int mstate;
1482 int mds = session->s_mds;
1483
1484 if (READ_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_FENCE_IO)
1485 return -EIO;
1486
1487 /* wait for mds to go active? */
1488 mstate = ceph_mdsmap_get_state(mdsc->mdsmap, mds);
1489 dout("open_session to mds%d (%s)\n", mds,
1490 ceph_mds_state_name(mstate));
1491 session->s_state = CEPH_MDS_SESSION_OPENING;
1492 session->s_renew_requested = jiffies;
1493
1494 /* send connect message */
1495 msg = create_session_open_msg(mdsc, session->s_seq);
1496 if (IS_ERR(msg))
1497 return PTR_ERR(msg);
1498 ceph_con_send(&session->s_con, msg);
1499 return 0;
1500}
1501
1502/*
1503 * open sessions for any export targets for the given mds
1504 *
1505 * called under mdsc->mutex
1506 */
1507static struct ceph_mds_session *
1508__open_export_target_session(struct ceph_mds_client *mdsc, int target)
1509{
1510 struct ceph_mds_session *session;
1511 int ret;
1512
1513 session = __ceph_lookup_mds_session(mdsc, target);
1514 if (!session) {
1515 session = register_session(mdsc, target);
1516 if (IS_ERR(session))
1517 return session;
1518 }
1519 if (session->s_state == CEPH_MDS_SESSION_NEW ||
1520 session->s_state == CEPH_MDS_SESSION_CLOSING) {
1521 ret = __open_session(mdsc, session);
1522 if (ret)
1523 return ERR_PTR(ret);
1524 }
1525
1526 return session;
1527}
1528
1529struct ceph_mds_session *
1530ceph_mdsc_open_export_target_session(struct ceph_mds_client *mdsc, int target)
1531{
1532 struct ceph_mds_session *session;
1533
1534 dout("open_export_target_session to mds%d\n", target);
1535
1536 mutex_lock(&mdsc->mutex);
1537 session = __open_export_target_session(mdsc, target);
1538 mutex_unlock(&mdsc->mutex);
1539
1540 return session;
1541}
1542
1543static void __open_export_target_sessions(struct ceph_mds_client *mdsc,
1544 struct ceph_mds_session *session)
1545{
1546 struct ceph_mds_info *mi;
1547 struct ceph_mds_session *ts;
1548 int i, mds = session->s_mds;
1549
1550 if (mds >= mdsc->mdsmap->possible_max_rank)
1551 return;
1552
1553 mi = &mdsc->mdsmap->m_info[mds];
1554 dout("open_export_target_sessions for mds%d (%d targets)\n",
1555 session->s_mds, mi->num_export_targets);
1556
1557 for (i = 0; i < mi->num_export_targets; i++) {
1558 ts = __open_export_target_session(mdsc, mi->export_targets[i]);
1559 ceph_put_mds_session(ts);
1560 }
1561}
1562
1563void ceph_mdsc_open_export_target_sessions(struct ceph_mds_client *mdsc,
1564 struct ceph_mds_session *session)
1565{
1566 mutex_lock(&mdsc->mutex);
1567 __open_export_target_sessions(mdsc, session);
1568 mutex_unlock(&mdsc->mutex);
1569}
1570
1571/*
1572 * session caps
1573 */
1574
1575static void detach_cap_releases(struct ceph_mds_session *session,
1576 struct list_head *target)
1577{
1578 lockdep_assert_held(&session->s_cap_lock);
1579
1580 list_splice_init(&session->s_cap_releases, target);
1581 session->s_num_cap_releases = 0;
1582 dout("dispose_cap_releases mds%d\n", session->s_mds);
1583}
1584
1585static void dispose_cap_releases(struct ceph_mds_client *mdsc,
1586 struct list_head *dispose)
1587{
1588 while (!list_empty(dispose)) {
1589 struct ceph_cap *cap;
1590 /* zero out the in-progress message */
1591 cap = list_first_entry(dispose, struct ceph_cap, session_caps);
1592 list_del(&cap->session_caps);
1593 ceph_put_cap(mdsc, cap);
1594 }
1595}
1596
1597static void cleanup_session_requests(struct ceph_mds_client *mdsc,
1598 struct ceph_mds_session *session)
1599{
1600 struct ceph_mds_request *req;
1601 struct rb_node *p;
1602
1603 dout("cleanup_session_requests mds%d\n", session->s_mds);
1604 mutex_lock(&mdsc->mutex);
1605 while (!list_empty(&session->s_unsafe)) {
1606 req = list_first_entry(&session->s_unsafe,
1607 struct ceph_mds_request, r_unsafe_item);
1608 pr_warn_ratelimited(" dropping unsafe request %llu\n",
1609 req->r_tid);
1610 if (req->r_target_inode)
1611 mapping_set_error(req->r_target_inode->i_mapping, -EIO);
1612 if (req->r_unsafe_dir)
1613 mapping_set_error(req->r_unsafe_dir->i_mapping, -EIO);
1614 __unregister_request(mdsc, req);
1615 }
1616 /* zero r_attempts, so kick_requests() will re-send requests */
1617 p = rb_first(&mdsc->request_tree);
1618 while (p) {
1619 req = rb_entry(p, struct ceph_mds_request, r_node);
1620 p = rb_next(p);
1621 if (req->r_session &&
1622 req->r_session->s_mds == session->s_mds)
1623 req->r_attempts = 0;
1624 }
1625 mutex_unlock(&mdsc->mutex);
1626}
1627
1628/*
1629 * Helper to safely iterate over all caps associated with a session, with
1630 * special care taken to handle a racing __ceph_remove_cap().
1631 *
1632 * Caller must hold session s_mutex.
1633 */
1634int ceph_iterate_session_caps(struct ceph_mds_session *session,
1635 int (*cb)(struct inode *, struct ceph_cap *,
1636 void *), void *arg)
1637{
1638 struct list_head *p;
1639 struct ceph_cap *cap;
1640 struct inode *inode, *last_inode = NULL;
1641 struct ceph_cap *old_cap = NULL;
1642 int ret;
1643
1644 dout("iterate_session_caps %p mds%d\n", session, session->s_mds);
1645 spin_lock(&session->s_cap_lock);
1646 p = session->s_caps.next;
1647 while (p != &session->s_caps) {
1648 cap = list_entry(p, struct ceph_cap, session_caps);
1649 inode = igrab(&cap->ci->netfs.inode);
1650 if (!inode) {
1651 p = p->next;
1652 continue;
1653 }
1654 session->s_cap_iterator = cap;
1655 spin_unlock(&session->s_cap_lock);
1656
1657 if (last_inode) {
1658 iput(last_inode);
1659 last_inode = NULL;
1660 }
1661 if (old_cap) {
1662 ceph_put_cap(session->s_mdsc, old_cap);
1663 old_cap = NULL;
1664 }
1665
1666 ret = cb(inode, cap, arg);
1667 last_inode = inode;
1668
1669 spin_lock(&session->s_cap_lock);
1670 p = p->next;
1671 if (!cap->ci) {
1672 dout("iterate_session_caps finishing cap %p removal\n",
1673 cap);
1674 BUG_ON(cap->session != session);
1675 cap->session = NULL;
1676 list_del_init(&cap->session_caps);
1677 session->s_nr_caps--;
1678 atomic64_dec(&session->s_mdsc->metric.total_caps);
1679 if (cap->queue_release)
1680 __ceph_queue_cap_release(session, cap);
1681 else
1682 old_cap = cap; /* put_cap it w/o locks held */
1683 }
1684 if (ret < 0)
1685 goto out;
1686 }
1687 ret = 0;
1688out:
1689 session->s_cap_iterator = NULL;
1690 spin_unlock(&session->s_cap_lock);
1691
1692 iput(last_inode);
1693 if (old_cap)
1694 ceph_put_cap(session->s_mdsc, old_cap);
1695
1696 return ret;
1697}
1698
1699static int remove_session_caps_cb(struct inode *inode, struct ceph_cap *cap,
1700 void *arg)
1701{
1702 struct ceph_inode_info *ci = ceph_inode(inode);
1703 bool invalidate = false;
1704 int iputs;
1705
1706 dout("removing cap %p, ci is %p, inode is %p\n",
1707 cap, ci, &ci->netfs.inode);
1708 spin_lock(&ci->i_ceph_lock);
1709 iputs = ceph_purge_inode_cap(inode, cap, &invalidate);
1710 spin_unlock(&ci->i_ceph_lock);
1711
1712 wake_up_all(&ci->i_cap_wq);
1713 if (invalidate)
1714 ceph_queue_invalidate(inode);
1715 while (iputs--)
1716 iput(inode);
1717 return 0;
1718}
1719
1720/*
1721 * caller must hold session s_mutex
1722 */
1723static void remove_session_caps(struct ceph_mds_session *session)
1724{
1725 struct ceph_fs_client *fsc = session->s_mdsc->fsc;
1726 struct super_block *sb = fsc->sb;
1727 LIST_HEAD(dispose);
1728
1729 dout("remove_session_caps on %p\n", session);
1730 ceph_iterate_session_caps(session, remove_session_caps_cb, fsc);
1731
1732 wake_up_all(&fsc->mdsc->cap_flushing_wq);
1733
1734 spin_lock(&session->s_cap_lock);
1735 if (session->s_nr_caps > 0) {
1736 struct inode *inode;
1737 struct ceph_cap *cap, *prev = NULL;
1738 struct ceph_vino vino;
1739 /*
1740 * iterate_session_caps() skips inodes that are being
1741 * deleted, we need to wait until deletions are complete.
1742 * __wait_on_freeing_inode() is designed for the job,
1743 * but it is not exported, so use lookup inode function
1744 * to access it.
1745 */
1746 while (!list_empty(&session->s_caps)) {
1747 cap = list_entry(session->s_caps.next,
1748 struct ceph_cap, session_caps);
1749 if (cap == prev)
1750 break;
1751 prev = cap;
1752 vino = cap->ci->i_vino;
1753 spin_unlock(&session->s_cap_lock);
1754
1755 inode = ceph_find_inode(sb, vino);
1756 iput(inode);
1757
1758 spin_lock(&session->s_cap_lock);
1759 }
1760 }
1761
1762 // drop cap expires and unlock s_cap_lock
1763 detach_cap_releases(session, &dispose);
1764
1765 BUG_ON(session->s_nr_caps > 0);
1766 BUG_ON(!list_empty(&session->s_cap_flushing));
1767 spin_unlock(&session->s_cap_lock);
1768 dispose_cap_releases(session->s_mdsc, &dispose);
1769}
1770
1771enum {
1772 RECONNECT,
1773 RENEWCAPS,
1774 FORCE_RO,
1775};
1776
1777/*
1778 * wake up any threads waiting on this session's caps. if the cap is
1779 * old (didn't get renewed on the client reconnect), remove it now.
1780 *
1781 * caller must hold s_mutex.
1782 */
1783static int wake_up_session_cb(struct inode *inode, struct ceph_cap *cap,
1784 void *arg)
1785{
1786 struct ceph_inode_info *ci = ceph_inode(inode);
1787 unsigned long ev = (unsigned long)arg;
1788
1789 if (ev == RECONNECT) {
1790 spin_lock(&ci->i_ceph_lock);
1791 ci->i_wanted_max_size = 0;
1792 ci->i_requested_max_size = 0;
1793 spin_unlock(&ci->i_ceph_lock);
1794 } else if (ev == RENEWCAPS) {
1795 if (cap->cap_gen < atomic_read(&cap->session->s_cap_gen)) {
1796 /* mds did not re-issue stale cap */
1797 spin_lock(&ci->i_ceph_lock);
1798 cap->issued = cap->implemented = CEPH_CAP_PIN;
1799 spin_unlock(&ci->i_ceph_lock);
1800 }
1801 } else if (ev == FORCE_RO) {
1802 }
1803 wake_up_all(&ci->i_cap_wq);
1804 return 0;
1805}
1806
1807static void wake_up_session_caps(struct ceph_mds_session *session, int ev)
1808{
1809 dout("wake_up_session_caps %p mds%d\n", session, session->s_mds);
1810 ceph_iterate_session_caps(session, wake_up_session_cb,
1811 (void *)(unsigned long)ev);
1812}
1813
1814/*
1815 * Send periodic message to MDS renewing all currently held caps. The
1816 * ack will reset the expiration for all caps from this session.
1817 *
1818 * caller holds s_mutex
1819 */
1820static int send_renew_caps(struct ceph_mds_client *mdsc,
1821 struct ceph_mds_session *session)
1822{
1823 struct ceph_msg *msg;
1824 int state;
1825
1826 if (time_after_eq(jiffies, session->s_cap_ttl) &&
1827 time_after_eq(session->s_cap_ttl, session->s_renew_requested))
1828 pr_info("mds%d caps stale\n", session->s_mds);
1829 session->s_renew_requested = jiffies;
1830
1831 /* do not try to renew caps until a recovering mds has reconnected
1832 * with its clients. */
1833 state = ceph_mdsmap_get_state(mdsc->mdsmap, session->s_mds);
1834 if (state < CEPH_MDS_STATE_RECONNECT) {
1835 dout("send_renew_caps ignoring mds%d (%s)\n",
1836 session->s_mds, ceph_mds_state_name(state));
1837 return 0;
1838 }
1839
1840 dout("send_renew_caps to mds%d (%s)\n", session->s_mds,
1841 ceph_mds_state_name(state));
1842 msg = ceph_create_session_msg(CEPH_SESSION_REQUEST_RENEWCAPS,
1843 ++session->s_renew_seq);
1844 if (!msg)
1845 return -ENOMEM;
1846 ceph_con_send(&session->s_con, msg);
1847 return 0;
1848}
1849
1850static int send_flushmsg_ack(struct ceph_mds_client *mdsc,
1851 struct ceph_mds_session *session, u64 seq)
1852{
1853 struct ceph_msg *msg;
1854
1855 dout("send_flushmsg_ack to mds%d (%s)s seq %lld\n",
1856 session->s_mds, ceph_session_state_name(session->s_state), seq);
1857 msg = ceph_create_session_msg(CEPH_SESSION_FLUSHMSG_ACK, seq);
1858 if (!msg)
1859 return -ENOMEM;
1860 ceph_con_send(&session->s_con, msg);
1861 return 0;
1862}
1863
1864
1865/*
1866 * Note new cap ttl, and any transition from stale -> not stale (fresh?).
1867 *
1868 * Called under session->s_mutex
1869 */
1870static void renewed_caps(struct ceph_mds_client *mdsc,
1871 struct ceph_mds_session *session, int is_renew)
1872{
1873 int was_stale;
1874 int wake = 0;
1875
1876 spin_lock(&session->s_cap_lock);
1877 was_stale = is_renew && time_after_eq(jiffies, session->s_cap_ttl);
1878
1879 session->s_cap_ttl = session->s_renew_requested +
1880 mdsc->mdsmap->m_session_timeout*HZ;
1881
1882 if (was_stale) {
1883 if (time_before(jiffies, session->s_cap_ttl)) {
1884 pr_info("mds%d caps renewed\n", session->s_mds);
1885 wake = 1;
1886 } else {
1887 pr_info("mds%d caps still stale\n", session->s_mds);
1888 }
1889 }
1890 dout("renewed_caps mds%d ttl now %lu, was %s, now %s\n",
1891 session->s_mds, session->s_cap_ttl, was_stale ? "stale" : "fresh",
1892 time_before(jiffies, session->s_cap_ttl) ? "stale" : "fresh");
1893 spin_unlock(&session->s_cap_lock);
1894
1895 if (wake)
1896 wake_up_session_caps(session, RENEWCAPS);
1897}
1898
1899/*
1900 * send a session close request
1901 */
1902static int request_close_session(struct ceph_mds_session *session)
1903{
1904 struct ceph_msg *msg;
1905
1906 dout("request_close_session mds%d state %s seq %lld\n",
1907 session->s_mds, ceph_session_state_name(session->s_state),
1908 session->s_seq);
1909 msg = ceph_create_session_msg(CEPH_SESSION_REQUEST_CLOSE,
1910 session->s_seq);
1911 if (!msg)
1912 return -ENOMEM;
1913 ceph_con_send(&session->s_con, msg);
1914 return 1;
1915}
1916
1917/*
1918 * Called with s_mutex held.
1919 */
1920static int __close_session(struct ceph_mds_client *mdsc,
1921 struct ceph_mds_session *session)
1922{
1923 if (session->s_state >= CEPH_MDS_SESSION_CLOSING)
1924 return 0;
1925 session->s_state = CEPH_MDS_SESSION_CLOSING;
1926 return request_close_session(session);
1927}
1928
1929static bool drop_negative_children(struct dentry *dentry)
1930{
1931 struct dentry *child;
1932 bool all_negative = true;
1933
1934 if (!d_is_dir(dentry))
1935 goto out;
1936
1937 spin_lock(&dentry->d_lock);
1938 list_for_each_entry(child, &dentry->d_subdirs, d_child) {
1939 if (d_really_is_positive(child)) {
1940 all_negative = false;
1941 break;
1942 }
1943 }
1944 spin_unlock(&dentry->d_lock);
1945
1946 if (all_negative)
1947 shrink_dcache_parent(dentry);
1948out:
1949 return all_negative;
1950}
1951
1952/*
1953 * Trim old(er) caps.
1954 *
1955 * Because we can't cache an inode without one or more caps, we do
1956 * this indirectly: if a cap is unused, we prune its aliases, at which
1957 * point the inode will hopefully get dropped to.
1958 *
1959 * Yes, this is a bit sloppy. Our only real goal here is to respond to
1960 * memory pressure from the MDS, though, so it needn't be perfect.
1961 */
1962static int trim_caps_cb(struct inode *inode, struct ceph_cap *cap, void *arg)
1963{
1964 int *remaining = arg;
1965 struct ceph_inode_info *ci = ceph_inode(inode);
1966 int used, wanted, oissued, mine;
1967
1968 if (*remaining <= 0)
1969 return -1;
1970
1971 spin_lock(&ci->i_ceph_lock);
1972 mine = cap->issued | cap->implemented;
1973 used = __ceph_caps_used(ci);
1974 wanted = __ceph_caps_file_wanted(ci);
1975 oissued = __ceph_caps_issued_other(ci, cap);
1976
1977 dout("trim_caps_cb %p cap %p mine %s oissued %s used %s wanted %s\n",
1978 inode, cap, ceph_cap_string(mine), ceph_cap_string(oissued),
1979 ceph_cap_string(used), ceph_cap_string(wanted));
1980 if (cap == ci->i_auth_cap) {
1981 if (ci->i_dirty_caps || ci->i_flushing_caps ||
1982 !list_empty(&ci->i_cap_snaps))
1983 goto out;
1984 if ((used | wanted) & CEPH_CAP_ANY_WR)
1985 goto out;
1986 /* Note: it's possible that i_filelock_ref becomes non-zero
1987 * after dropping auth caps. It doesn't hurt because reply
1988 * of lock mds request will re-add auth caps. */
1989 if (atomic_read(&ci->i_filelock_ref) > 0)
1990 goto out;
1991 }
1992 /* The inode has cached pages, but it's no longer used.
1993 * we can safely drop it */
1994 if (S_ISREG(inode->i_mode) &&
1995 wanted == 0 && used == CEPH_CAP_FILE_CACHE &&
1996 !(oissued & CEPH_CAP_FILE_CACHE)) {
1997 used = 0;
1998 oissued = 0;
1999 }
2000 if ((used | wanted) & ~oissued & mine)
2001 goto out; /* we need these caps */
2002
2003 if (oissued) {
2004 /* we aren't the only cap.. just remove us */
2005 ceph_remove_cap(cap, true);
2006 (*remaining)--;
2007 } else {
2008 struct dentry *dentry;
2009 /* try dropping referring dentries */
2010 spin_unlock(&ci->i_ceph_lock);
2011 dentry = d_find_any_alias(inode);
2012 if (dentry && drop_negative_children(dentry)) {
2013 int count;
2014 dput(dentry);
2015 d_prune_aliases(inode);
2016 count = atomic_read(&inode->i_count);
2017 if (count == 1)
2018 (*remaining)--;
2019 dout("trim_caps_cb %p cap %p pruned, count now %d\n",
2020 inode, cap, count);
2021 } else {
2022 dput(dentry);
2023 }
2024 return 0;
2025 }
2026
2027out:
2028 spin_unlock(&ci->i_ceph_lock);
2029 return 0;
2030}
2031
2032/*
2033 * Trim session cap count down to some max number.
2034 */
2035int ceph_trim_caps(struct ceph_mds_client *mdsc,
2036 struct ceph_mds_session *session,
2037 int max_caps)
2038{
2039 int trim_caps = session->s_nr_caps - max_caps;
2040
2041 dout("trim_caps mds%d start: %d / %d, trim %d\n",
2042 session->s_mds, session->s_nr_caps, max_caps, trim_caps);
2043 if (trim_caps > 0) {
2044 int remaining = trim_caps;
2045
2046 ceph_iterate_session_caps(session, trim_caps_cb, &remaining);
2047 dout("trim_caps mds%d done: %d / %d, trimmed %d\n",
2048 session->s_mds, session->s_nr_caps, max_caps,
2049 trim_caps - remaining);
2050 }
2051
2052 ceph_flush_cap_releases(mdsc, session);
2053 return 0;
2054}
2055
2056static int check_caps_flush(struct ceph_mds_client *mdsc,
2057 u64 want_flush_tid)
2058{
2059 int ret = 1;
2060
2061 spin_lock(&mdsc->cap_dirty_lock);
2062 if (!list_empty(&mdsc->cap_flush_list)) {
2063 struct ceph_cap_flush *cf =
2064 list_first_entry(&mdsc->cap_flush_list,
2065 struct ceph_cap_flush, g_list);
2066 if (cf->tid <= want_flush_tid) {
2067 dout("check_caps_flush still flushing tid "
2068 "%llu <= %llu\n", cf->tid, want_flush_tid);
2069 ret = 0;
2070 }
2071 }
2072 spin_unlock(&mdsc->cap_dirty_lock);
2073 return ret;
2074}
2075
2076/*
2077 * flush all dirty inode data to disk.
2078 *
2079 * returns true if we've flushed through want_flush_tid
2080 */
2081static void wait_caps_flush(struct ceph_mds_client *mdsc,
2082 u64 want_flush_tid)
2083{
2084 dout("check_caps_flush want %llu\n", want_flush_tid);
2085
2086 wait_event(mdsc->cap_flushing_wq,
2087 check_caps_flush(mdsc, want_flush_tid));
2088
2089 dout("check_caps_flush ok, flushed thru %llu\n", want_flush_tid);
2090}
2091
2092/*
2093 * called under s_mutex
2094 */
2095static void ceph_send_cap_releases(struct ceph_mds_client *mdsc,
2096 struct ceph_mds_session *session)
2097{
2098 struct ceph_msg *msg = NULL;
2099 struct ceph_mds_cap_release *head;
2100 struct ceph_mds_cap_item *item;
2101 struct ceph_osd_client *osdc = &mdsc->fsc->client->osdc;
2102 struct ceph_cap *cap;
2103 LIST_HEAD(tmp_list);
2104 int num_cap_releases;
2105 __le32 barrier, *cap_barrier;
2106
2107 down_read(&osdc->lock);
2108 barrier = cpu_to_le32(osdc->epoch_barrier);
2109 up_read(&osdc->lock);
2110
2111 spin_lock(&session->s_cap_lock);
2112again:
2113 list_splice_init(&session->s_cap_releases, &tmp_list);
2114 num_cap_releases = session->s_num_cap_releases;
2115 session->s_num_cap_releases = 0;
2116 spin_unlock(&session->s_cap_lock);
2117
2118 while (!list_empty(&tmp_list)) {
2119 if (!msg) {
2120 msg = ceph_msg_new(CEPH_MSG_CLIENT_CAPRELEASE,
2121 PAGE_SIZE, GFP_NOFS, false);
2122 if (!msg)
2123 goto out_err;
2124 head = msg->front.iov_base;
2125 head->num = cpu_to_le32(0);
2126 msg->front.iov_len = sizeof(*head);
2127
2128 msg->hdr.version = cpu_to_le16(2);
2129 msg->hdr.compat_version = cpu_to_le16(1);
2130 }
2131
2132 cap = list_first_entry(&tmp_list, struct ceph_cap,
2133 session_caps);
2134 list_del(&cap->session_caps);
2135 num_cap_releases--;
2136
2137 head = msg->front.iov_base;
2138 put_unaligned_le32(get_unaligned_le32(&head->num) + 1,
2139 &head->num);
2140 item = msg->front.iov_base + msg->front.iov_len;
2141 item->ino = cpu_to_le64(cap->cap_ino);
2142 item->cap_id = cpu_to_le64(cap->cap_id);
2143 item->migrate_seq = cpu_to_le32(cap->mseq);
2144 item->seq = cpu_to_le32(cap->issue_seq);
2145 msg->front.iov_len += sizeof(*item);
2146
2147 ceph_put_cap(mdsc, cap);
2148
2149 if (le32_to_cpu(head->num) == CEPH_CAPS_PER_RELEASE) {
2150 // Append cap_barrier field
2151 cap_barrier = msg->front.iov_base + msg->front.iov_len;
2152 *cap_barrier = barrier;
2153 msg->front.iov_len += sizeof(*cap_barrier);
2154
2155 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
2156 dout("send_cap_releases mds%d %p\n", session->s_mds, msg);
2157 ceph_con_send(&session->s_con, msg);
2158 msg = NULL;
2159 }
2160 }
2161
2162 BUG_ON(num_cap_releases != 0);
2163
2164 spin_lock(&session->s_cap_lock);
2165 if (!list_empty(&session->s_cap_releases))
2166 goto again;
2167 spin_unlock(&session->s_cap_lock);
2168
2169 if (msg) {
2170 // Append cap_barrier field
2171 cap_barrier = msg->front.iov_base + msg->front.iov_len;
2172 *cap_barrier = barrier;
2173 msg->front.iov_len += sizeof(*cap_barrier);
2174
2175 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
2176 dout("send_cap_releases mds%d %p\n", session->s_mds, msg);
2177 ceph_con_send(&session->s_con, msg);
2178 }
2179 return;
2180out_err:
2181 pr_err("send_cap_releases mds%d, failed to allocate message\n",
2182 session->s_mds);
2183 spin_lock(&session->s_cap_lock);
2184 list_splice(&tmp_list, &session->s_cap_releases);
2185 session->s_num_cap_releases += num_cap_releases;
2186 spin_unlock(&session->s_cap_lock);
2187}
2188
2189static void ceph_cap_release_work(struct work_struct *work)
2190{
2191 struct ceph_mds_session *session =
2192 container_of(work, struct ceph_mds_session, s_cap_release_work);
2193
2194 mutex_lock(&session->s_mutex);
2195 if (session->s_state == CEPH_MDS_SESSION_OPEN ||
2196 session->s_state == CEPH_MDS_SESSION_HUNG)
2197 ceph_send_cap_releases(session->s_mdsc, session);
2198 mutex_unlock(&session->s_mutex);
2199 ceph_put_mds_session(session);
2200}
2201
2202void ceph_flush_cap_releases(struct ceph_mds_client *mdsc,
2203 struct ceph_mds_session *session)
2204{
2205 if (mdsc->stopping)
2206 return;
2207
2208 ceph_get_mds_session(session);
2209 if (queue_work(mdsc->fsc->cap_wq,
2210 &session->s_cap_release_work)) {
2211 dout("cap release work queued\n");
2212 } else {
2213 ceph_put_mds_session(session);
2214 dout("failed to queue cap release work\n");
2215 }
2216}
2217
2218/*
2219 * caller holds session->s_cap_lock
2220 */
2221void __ceph_queue_cap_release(struct ceph_mds_session *session,
2222 struct ceph_cap *cap)
2223{
2224 list_add_tail(&cap->session_caps, &session->s_cap_releases);
2225 session->s_num_cap_releases++;
2226
2227 if (!(session->s_num_cap_releases % CEPH_CAPS_PER_RELEASE))
2228 ceph_flush_cap_releases(session->s_mdsc, session);
2229}
2230
2231static void ceph_cap_reclaim_work(struct work_struct *work)
2232{
2233 struct ceph_mds_client *mdsc =
2234 container_of(work, struct ceph_mds_client, cap_reclaim_work);
2235 int ret = ceph_trim_dentries(mdsc);
2236 if (ret == -EAGAIN)
2237 ceph_queue_cap_reclaim_work(mdsc);
2238}
2239
2240void ceph_queue_cap_reclaim_work(struct ceph_mds_client *mdsc)
2241{
2242 if (mdsc->stopping)
2243 return;
2244
2245 if (queue_work(mdsc->fsc->cap_wq, &mdsc->cap_reclaim_work)) {
2246 dout("caps reclaim work queued\n");
2247 } else {
2248 dout("failed to queue caps release work\n");
2249 }
2250}
2251
2252void ceph_reclaim_caps_nr(struct ceph_mds_client *mdsc, int nr)
2253{
2254 int val;
2255 if (!nr)
2256 return;
2257 val = atomic_add_return(nr, &mdsc->cap_reclaim_pending);
2258 if ((val % CEPH_CAPS_PER_RELEASE) < nr) {
2259 atomic_set(&mdsc->cap_reclaim_pending, 0);
2260 ceph_queue_cap_reclaim_work(mdsc);
2261 }
2262}
2263
2264/*
2265 * requests
2266 */
2267
2268int ceph_alloc_readdir_reply_buffer(struct ceph_mds_request *req,
2269 struct inode *dir)
2270{
2271 struct ceph_inode_info *ci = ceph_inode(dir);
2272 struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
2273 struct ceph_mount_options *opt = req->r_mdsc->fsc->mount_options;
2274 size_t size = sizeof(struct ceph_mds_reply_dir_entry);
2275 unsigned int num_entries;
2276 int order;
2277
2278 spin_lock(&ci->i_ceph_lock);
2279 num_entries = ci->i_files + ci->i_subdirs;
2280 spin_unlock(&ci->i_ceph_lock);
2281 num_entries = max(num_entries, 1U);
2282 num_entries = min(num_entries, opt->max_readdir);
2283
2284 order = get_order(size * num_entries);
2285 while (order >= 0) {
2286 rinfo->dir_entries = (void*)__get_free_pages(GFP_KERNEL |
2287 __GFP_NOWARN |
2288 __GFP_ZERO,
2289 order);
2290 if (rinfo->dir_entries)
2291 break;
2292 order--;
2293 }
2294 if (!rinfo->dir_entries)
2295 return -ENOMEM;
2296
2297 num_entries = (PAGE_SIZE << order) / size;
2298 num_entries = min(num_entries, opt->max_readdir);
2299
2300 rinfo->dir_buf_size = PAGE_SIZE << order;
2301 req->r_num_caps = num_entries + 1;
2302 req->r_args.readdir.max_entries = cpu_to_le32(num_entries);
2303 req->r_args.readdir.max_bytes = cpu_to_le32(opt->max_readdir_bytes);
2304 return 0;
2305}
2306
2307/*
2308 * Create an mds request.
2309 */
2310struct ceph_mds_request *
2311ceph_mdsc_create_request(struct ceph_mds_client *mdsc, int op, int mode)
2312{
2313 struct ceph_mds_request *req;
2314
2315 req = kmem_cache_zalloc(ceph_mds_request_cachep, GFP_NOFS);
2316 if (!req)
2317 return ERR_PTR(-ENOMEM);
2318
2319 mutex_init(&req->r_fill_mutex);
2320 req->r_mdsc = mdsc;
2321 req->r_started = jiffies;
2322 req->r_start_latency = ktime_get();
2323 req->r_resend_mds = -1;
2324 INIT_LIST_HEAD(&req->r_unsafe_dir_item);
2325 INIT_LIST_HEAD(&req->r_unsafe_target_item);
2326 req->r_fmode = -1;
2327 req->r_feature_needed = -1;
2328 kref_init(&req->r_kref);
2329 RB_CLEAR_NODE(&req->r_node);
2330 INIT_LIST_HEAD(&req->r_wait);
2331 init_completion(&req->r_completion);
2332 init_completion(&req->r_safe_completion);
2333 INIT_LIST_HEAD(&req->r_unsafe_item);
2334
2335 ktime_get_coarse_real_ts64(&req->r_stamp);
2336
2337 req->r_op = op;
2338 req->r_direct_mode = mode;
2339 return req;
2340}
2341
2342/*
2343 * return oldest (lowest) request, tid in request tree, 0 if none.
2344 *
2345 * called under mdsc->mutex.
2346 */
2347static struct ceph_mds_request *__get_oldest_req(struct ceph_mds_client *mdsc)
2348{
2349 if (RB_EMPTY_ROOT(&mdsc->request_tree))
2350 return NULL;
2351 return rb_entry(rb_first(&mdsc->request_tree),
2352 struct ceph_mds_request, r_node);
2353}
2354
2355static inline u64 __get_oldest_tid(struct ceph_mds_client *mdsc)
2356{
2357 return mdsc->oldest_tid;
2358}
2359
2360/*
2361 * Build a dentry's path. Allocate on heap; caller must kfree. Based
2362 * on build_path_from_dentry in fs/cifs/dir.c.
2363 *
2364 * If @stop_on_nosnap, generate path relative to the first non-snapped
2365 * inode.
2366 *
2367 * Encode hidden .snap dirs as a double /, i.e.
2368 * foo/.snap/bar -> foo//bar
2369 */
2370char *ceph_mdsc_build_path(struct dentry *dentry, int *plen, u64 *pbase,
2371 int stop_on_nosnap)
2372{
2373 struct dentry *temp;
2374 char *path;
2375 int pos;
2376 unsigned seq;
2377 u64 base;
2378
2379 if (!dentry)
2380 return ERR_PTR(-EINVAL);
2381
2382 path = __getname();
2383 if (!path)
2384 return ERR_PTR(-ENOMEM);
2385retry:
2386 pos = PATH_MAX - 1;
2387 path[pos] = '\0';
2388
2389 seq = read_seqbegin(&rename_lock);
2390 rcu_read_lock();
2391 temp = dentry;
2392 for (;;) {
2393 struct inode *inode;
2394
2395 spin_lock(&temp->d_lock);
2396 inode = d_inode(temp);
2397 if (inode && ceph_snap(inode) == CEPH_SNAPDIR) {
2398 dout("build_path path+%d: %p SNAPDIR\n",
2399 pos, temp);
2400 } else if (stop_on_nosnap && inode && dentry != temp &&
2401 ceph_snap(inode) == CEPH_NOSNAP) {
2402 spin_unlock(&temp->d_lock);
2403 pos++; /* get rid of any prepended '/' */
2404 break;
2405 } else {
2406 pos -= temp->d_name.len;
2407 if (pos < 0) {
2408 spin_unlock(&temp->d_lock);
2409 break;
2410 }
2411 memcpy(path + pos, temp->d_name.name, temp->d_name.len);
2412 }
2413 spin_unlock(&temp->d_lock);
2414 temp = READ_ONCE(temp->d_parent);
2415
2416 /* Are we at the root? */
2417 if (IS_ROOT(temp))
2418 break;
2419
2420 /* Are we out of buffer? */
2421 if (--pos < 0)
2422 break;
2423
2424 path[pos] = '/';
2425 }
2426 base = ceph_ino(d_inode(temp));
2427 rcu_read_unlock();
2428
2429 if (read_seqretry(&rename_lock, seq))
2430 goto retry;
2431
2432 if (pos < 0) {
2433 /*
2434 * A rename didn't occur, but somehow we didn't end up where
2435 * we thought we would. Throw a warning and try again.
2436 */
2437 pr_warn("build_path did not end path lookup where "
2438 "expected, pos is %d\n", pos);
2439 goto retry;
2440 }
2441
2442 *pbase = base;
2443 *plen = PATH_MAX - 1 - pos;
2444 dout("build_path on %p %d built %llx '%.*s'\n",
2445 dentry, d_count(dentry), base, *plen, path + pos);
2446 return path + pos;
2447}
2448
2449static int build_dentry_path(struct dentry *dentry, struct inode *dir,
2450 const char **ppath, int *ppathlen, u64 *pino,
2451 bool *pfreepath, bool parent_locked)
2452{
2453 char *path;
2454
2455 rcu_read_lock();
2456 if (!dir)
2457 dir = d_inode_rcu(dentry->d_parent);
2458 if (dir && parent_locked && ceph_snap(dir) == CEPH_NOSNAP) {
2459 *pino = ceph_ino(dir);
2460 rcu_read_unlock();
2461 *ppath = dentry->d_name.name;
2462 *ppathlen = dentry->d_name.len;
2463 return 0;
2464 }
2465 rcu_read_unlock();
2466 path = ceph_mdsc_build_path(dentry, ppathlen, pino, 1);
2467 if (IS_ERR(path))
2468 return PTR_ERR(path);
2469 *ppath = path;
2470 *pfreepath = true;
2471 return 0;
2472}
2473
2474static int build_inode_path(struct inode *inode,
2475 const char **ppath, int *ppathlen, u64 *pino,
2476 bool *pfreepath)
2477{
2478 struct dentry *dentry;
2479 char *path;
2480
2481 if (ceph_snap(inode) == CEPH_NOSNAP) {
2482 *pino = ceph_ino(inode);
2483 *ppathlen = 0;
2484 return 0;
2485 }
2486 dentry = d_find_alias(inode);
2487 path = ceph_mdsc_build_path(dentry, ppathlen, pino, 1);
2488 dput(dentry);
2489 if (IS_ERR(path))
2490 return PTR_ERR(path);
2491 *ppath = path;
2492 *pfreepath = true;
2493 return 0;
2494}
2495
2496/*
2497 * request arguments may be specified via an inode *, a dentry *, or
2498 * an explicit ino+path.
2499 */
2500static int set_request_path_attr(struct inode *rinode, struct dentry *rdentry,
2501 struct inode *rdiri, const char *rpath,
2502 u64 rino, const char **ppath, int *pathlen,
2503 u64 *ino, bool *freepath, bool parent_locked)
2504{
2505 int r = 0;
2506
2507 if (rinode) {
2508 r = build_inode_path(rinode, ppath, pathlen, ino, freepath);
2509 dout(" inode %p %llx.%llx\n", rinode, ceph_ino(rinode),
2510 ceph_snap(rinode));
2511 } else if (rdentry) {
2512 r = build_dentry_path(rdentry, rdiri, ppath, pathlen, ino,
2513 freepath, parent_locked);
2514 dout(" dentry %p %llx/%.*s\n", rdentry, *ino, *pathlen,
2515 *ppath);
2516 } else if (rpath || rino) {
2517 *ino = rino;
2518 *ppath = rpath;
2519 *pathlen = rpath ? strlen(rpath) : 0;
2520 dout(" path %.*s\n", *pathlen, rpath);
2521 }
2522
2523 return r;
2524}
2525
2526static void encode_timestamp_and_gids(void **p,
2527 const struct ceph_mds_request *req)
2528{
2529 struct ceph_timespec ts;
2530 int i;
2531
2532 ceph_encode_timespec64(&ts, &req->r_stamp);
2533 ceph_encode_copy(p, &ts, sizeof(ts));
2534
2535 /* gid_list */
2536 ceph_encode_32(p, req->r_cred->group_info->ngroups);
2537 for (i = 0; i < req->r_cred->group_info->ngroups; i++)
2538 ceph_encode_64(p, from_kgid(&init_user_ns,
2539 req->r_cred->group_info->gid[i]));
2540}
2541
2542/*
2543 * called under mdsc->mutex
2544 */
2545static struct ceph_msg *create_request_message(struct ceph_mds_session *session,
2546 struct ceph_mds_request *req,
2547 bool drop_cap_releases)
2548{
2549 int mds = session->s_mds;
2550 struct ceph_mds_client *mdsc = session->s_mdsc;
2551 struct ceph_msg *msg;
2552 struct ceph_mds_request_head_old *head;
2553 const char *path1 = NULL;
2554 const char *path2 = NULL;
2555 u64 ino1 = 0, ino2 = 0;
2556 int pathlen1 = 0, pathlen2 = 0;
2557 bool freepath1 = false, freepath2 = false;
2558 int len;
2559 u16 releases;
2560 void *p, *end;
2561 int ret;
2562 bool legacy = !(session->s_con.peer_features & CEPH_FEATURE_FS_BTIME);
2563
2564 ret = set_request_path_attr(req->r_inode, req->r_dentry,
2565 req->r_parent, req->r_path1, req->r_ino1.ino,
2566 &path1, &pathlen1, &ino1, &freepath1,
2567 test_bit(CEPH_MDS_R_PARENT_LOCKED,
2568 &req->r_req_flags));
2569 if (ret < 0) {
2570 msg = ERR_PTR(ret);
2571 goto out;
2572 }
2573
2574 /* If r_old_dentry is set, then assume that its parent is locked */
2575 ret = set_request_path_attr(NULL, req->r_old_dentry,
2576 req->r_old_dentry_dir,
2577 req->r_path2, req->r_ino2.ino,
2578 &path2, &pathlen2, &ino2, &freepath2, true);
2579 if (ret < 0) {
2580 msg = ERR_PTR(ret);
2581 goto out_free1;
2582 }
2583
2584 len = legacy ? sizeof(*head) : sizeof(struct ceph_mds_request_head);
2585 len += pathlen1 + pathlen2 + 2*(1 + sizeof(u32) + sizeof(u64)) +
2586 sizeof(struct ceph_timespec);
2587 len += sizeof(u32) + (sizeof(u64) * req->r_cred->group_info->ngroups);
2588
2589 /* calculate (max) length for cap releases */
2590 len += sizeof(struct ceph_mds_request_release) *
2591 (!!req->r_inode_drop + !!req->r_dentry_drop +
2592 !!req->r_old_inode_drop + !!req->r_old_dentry_drop);
2593
2594 if (req->r_dentry_drop)
2595 len += pathlen1;
2596 if (req->r_old_dentry_drop)
2597 len += pathlen2;
2598
2599 msg = ceph_msg_new2(CEPH_MSG_CLIENT_REQUEST, len, 1, GFP_NOFS, false);
2600 if (!msg) {
2601 msg = ERR_PTR(-ENOMEM);
2602 goto out_free2;
2603 }
2604
2605 msg->hdr.tid = cpu_to_le64(req->r_tid);
2606
2607 /*
2608 * The old ceph_mds_request_head didn't contain a version field, and
2609 * one was added when we moved the message version from 3->4.
2610 */
2611 if (legacy) {
2612 msg->hdr.version = cpu_to_le16(3);
2613 head = msg->front.iov_base;
2614 p = msg->front.iov_base + sizeof(*head);
2615 } else {
2616 struct ceph_mds_request_head *new_head = msg->front.iov_base;
2617
2618 msg->hdr.version = cpu_to_le16(4);
2619 new_head->version = cpu_to_le16(CEPH_MDS_REQUEST_HEAD_VERSION);
2620 head = (struct ceph_mds_request_head_old *)&new_head->oldest_client_tid;
2621 p = msg->front.iov_base + sizeof(*new_head);
2622 }
2623
2624 end = msg->front.iov_base + msg->front.iov_len;
2625
2626 head->mdsmap_epoch = cpu_to_le32(mdsc->mdsmap->m_epoch);
2627 head->op = cpu_to_le32(req->r_op);
2628 head->caller_uid = cpu_to_le32(from_kuid(&init_user_ns,
2629 req->r_cred->fsuid));
2630 head->caller_gid = cpu_to_le32(from_kgid(&init_user_ns,
2631 req->r_cred->fsgid));
2632 head->ino = cpu_to_le64(req->r_deleg_ino);
2633 head->args = req->r_args;
2634
2635 ceph_encode_filepath(&p, end, ino1, path1);
2636 ceph_encode_filepath(&p, end, ino2, path2);
2637
2638 /* make note of release offset, in case we need to replay */
2639 req->r_request_release_offset = p - msg->front.iov_base;
2640
2641 /* cap releases */
2642 releases = 0;
2643 if (req->r_inode_drop)
2644 releases += ceph_encode_inode_release(&p,
2645 req->r_inode ? req->r_inode : d_inode(req->r_dentry),
2646 mds, req->r_inode_drop, req->r_inode_unless,
2647 req->r_op == CEPH_MDS_OP_READDIR);
2648 if (req->r_dentry_drop)
2649 releases += ceph_encode_dentry_release(&p, req->r_dentry,
2650 req->r_parent, mds, req->r_dentry_drop,
2651 req->r_dentry_unless);
2652 if (req->r_old_dentry_drop)
2653 releases += ceph_encode_dentry_release(&p, req->r_old_dentry,
2654 req->r_old_dentry_dir, mds,
2655 req->r_old_dentry_drop,
2656 req->r_old_dentry_unless);
2657 if (req->r_old_inode_drop)
2658 releases += ceph_encode_inode_release(&p,
2659 d_inode(req->r_old_dentry),
2660 mds, req->r_old_inode_drop, req->r_old_inode_unless, 0);
2661
2662 if (drop_cap_releases) {
2663 releases = 0;
2664 p = msg->front.iov_base + req->r_request_release_offset;
2665 }
2666
2667 head->num_releases = cpu_to_le16(releases);
2668
2669 encode_timestamp_and_gids(&p, req);
2670
2671 if (WARN_ON_ONCE(p > end)) {
2672 ceph_msg_put(msg);
2673 msg = ERR_PTR(-ERANGE);
2674 goto out_free2;
2675 }
2676
2677 msg->front.iov_len = p - msg->front.iov_base;
2678 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
2679
2680 if (req->r_pagelist) {
2681 struct ceph_pagelist *pagelist = req->r_pagelist;
2682 ceph_msg_data_add_pagelist(msg, pagelist);
2683 msg->hdr.data_len = cpu_to_le32(pagelist->length);
2684 } else {
2685 msg->hdr.data_len = 0;
2686 }
2687
2688 msg->hdr.data_off = cpu_to_le16(0);
2689
2690out_free2:
2691 if (freepath2)
2692 ceph_mdsc_free_path((char *)path2, pathlen2);
2693out_free1:
2694 if (freepath1)
2695 ceph_mdsc_free_path((char *)path1, pathlen1);
2696out:
2697 return msg;
2698}
2699
2700/*
2701 * called under mdsc->mutex if error, under no mutex if
2702 * success.
2703 */
2704static void complete_request(struct ceph_mds_client *mdsc,
2705 struct ceph_mds_request *req)
2706{
2707 req->r_end_latency = ktime_get();
2708
2709 if (req->r_callback)
2710 req->r_callback(mdsc, req);
2711 complete_all(&req->r_completion);
2712}
2713
2714static struct ceph_mds_request_head_old *
2715find_old_request_head(void *p, u64 features)
2716{
2717 bool legacy = !(features & CEPH_FEATURE_FS_BTIME);
2718 struct ceph_mds_request_head *new_head;
2719
2720 if (legacy)
2721 return (struct ceph_mds_request_head_old *)p;
2722 new_head = (struct ceph_mds_request_head *)p;
2723 return (struct ceph_mds_request_head_old *)&new_head->oldest_client_tid;
2724}
2725
2726/*
2727 * called under mdsc->mutex
2728 */
2729static int __prepare_send_request(struct ceph_mds_session *session,
2730 struct ceph_mds_request *req,
2731 bool drop_cap_releases)
2732{
2733 int mds = session->s_mds;
2734 struct ceph_mds_client *mdsc = session->s_mdsc;
2735 struct ceph_mds_request_head_old *rhead;
2736 struct ceph_msg *msg;
2737 int flags = 0, max_retry;
2738
2739 /*
2740 * The type of 'r_attempts' in kernel 'ceph_mds_request'
2741 * is 'int', while in 'ceph_mds_request_head' the type of
2742 * 'num_retry' is '__u8'. So in case the request retries
2743 * exceeding 256 times, the MDS will receive a incorrect
2744 * retry seq.
2745 *
2746 * In this case it's ususally a bug in MDS and continue
2747 * retrying the request makes no sense.
2748 *
2749 * In future this could be fixed in ceph code, so avoid
2750 * using the hardcode here.
2751 */
2752 max_retry = sizeof_field(struct ceph_mds_request_head, num_retry);
2753 max_retry = 1 << (max_retry * BITS_PER_BYTE);
2754 if (req->r_attempts >= max_retry) {
2755 pr_warn_ratelimited("%s request tid %llu seq overflow\n",
2756 __func__, req->r_tid);
2757 return -EMULTIHOP;
2758 }
2759
2760 req->r_attempts++;
2761 if (req->r_inode) {
2762 struct ceph_cap *cap =
2763 ceph_get_cap_for_mds(ceph_inode(req->r_inode), mds);
2764
2765 if (cap)
2766 req->r_sent_on_mseq = cap->mseq;
2767 else
2768 req->r_sent_on_mseq = -1;
2769 }
2770 dout("%s %p tid %lld %s (attempt %d)\n", __func__, req,
2771 req->r_tid, ceph_mds_op_name(req->r_op), req->r_attempts);
2772
2773 if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) {
2774 void *p;
2775
2776 /*
2777 * Replay. Do not regenerate message (and rebuild
2778 * paths, etc.); just use the original message.
2779 * Rebuilding paths will break for renames because
2780 * d_move mangles the src name.
2781 */
2782 msg = req->r_request;
2783 rhead = find_old_request_head(msg->front.iov_base,
2784 session->s_con.peer_features);
2785
2786 flags = le32_to_cpu(rhead->flags);
2787 flags |= CEPH_MDS_FLAG_REPLAY;
2788 rhead->flags = cpu_to_le32(flags);
2789
2790 if (req->r_target_inode)
2791 rhead->ino = cpu_to_le64(ceph_ino(req->r_target_inode));
2792
2793 rhead->num_retry = req->r_attempts - 1;
2794
2795 /* remove cap/dentry releases from message */
2796 rhead->num_releases = 0;
2797
2798 p = msg->front.iov_base + req->r_request_release_offset;
2799 encode_timestamp_and_gids(&p, req);
2800
2801 msg->front.iov_len = p - msg->front.iov_base;
2802 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
2803 return 0;
2804 }
2805
2806 if (req->r_request) {
2807 ceph_msg_put(req->r_request);
2808 req->r_request = NULL;
2809 }
2810 msg = create_request_message(session, req, drop_cap_releases);
2811 if (IS_ERR(msg)) {
2812 req->r_err = PTR_ERR(msg);
2813 return PTR_ERR(msg);
2814 }
2815 req->r_request = msg;
2816
2817 rhead = find_old_request_head(msg->front.iov_base,
2818 session->s_con.peer_features);
2819 rhead->oldest_client_tid = cpu_to_le64(__get_oldest_tid(mdsc));
2820 if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags))
2821 flags |= CEPH_MDS_FLAG_REPLAY;
2822 if (test_bit(CEPH_MDS_R_ASYNC, &req->r_req_flags))
2823 flags |= CEPH_MDS_FLAG_ASYNC;
2824 if (req->r_parent)
2825 flags |= CEPH_MDS_FLAG_WANT_DENTRY;
2826 rhead->flags = cpu_to_le32(flags);
2827 rhead->num_fwd = req->r_num_fwd;
2828 rhead->num_retry = req->r_attempts - 1;
2829
2830 dout(" r_parent = %p\n", req->r_parent);
2831 return 0;
2832}
2833
2834/*
2835 * called under mdsc->mutex
2836 */
2837static int __send_request(struct ceph_mds_session *session,
2838 struct ceph_mds_request *req,
2839 bool drop_cap_releases)
2840{
2841 int err;
2842
2843 err = __prepare_send_request(session, req, drop_cap_releases);
2844 if (!err) {
2845 ceph_msg_get(req->r_request);
2846 ceph_con_send(&session->s_con, req->r_request);
2847 }
2848
2849 return err;
2850}
2851
2852/*
2853 * send request, or put it on the appropriate wait list.
2854 */
2855static void __do_request(struct ceph_mds_client *mdsc,
2856 struct ceph_mds_request *req)
2857{
2858 struct ceph_mds_session *session = NULL;
2859 int mds = -1;
2860 int err = 0;
2861 bool random;
2862
2863 if (req->r_err || test_bit(CEPH_MDS_R_GOT_RESULT, &req->r_req_flags)) {
2864 if (test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags))
2865 __unregister_request(mdsc, req);
2866 return;
2867 }
2868
2869 if (READ_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_FENCE_IO) {
2870 dout("do_request metadata corrupted\n");
2871 err = -EIO;
2872 goto finish;
2873 }
2874 if (req->r_timeout &&
2875 time_after_eq(jiffies, req->r_started + req->r_timeout)) {
2876 dout("do_request timed out\n");
2877 err = -ETIMEDOUT;
2878 goto finish;
2879 }
2880 if (READ_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_SHUTDOWN) {
2881 dout("do_request forced umount\n");
2882 err = -EIO;
2883 goto finish;
2884 }
2885 if (READ_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_MOUNTING) {
2886 if (mdsc->mdsmap_err) {
2887 err = mdsc->mdsmap_err;
2888 dout("do_request mdsmap err %d\n", err);
2889 goto finish;
2890 }
2891 if (mdsc->mdsmap->m_epoch == 0) {
2892 dout("do_request no mdsmap, waiting for map\n");
2893 list_add(&req->r_wait, &mdsc->waiting_for_map);
2894 return;
2895 }
2896 if (!(mdsc->fsc->mount_options->flags &
2897 CEPH_MOUNT_OPT_MOUNTWAIT) &&
2898 !ceph_mdsmap_is_cluster_available(mdsc->mdsmap)) {
2899 err = -EHOSTUNREACH;
2900 goto finish;
2901 }
2902 }
2903
2904 put_request_session(req);
2905
2906 mds = __choose_mds(mdsc, req, &random);
2907 if (mds < 0 ||
2908 ceph_mdsmap_get_state(mdsc->mdsmap, mds) < CEPH_MDS_STATE_ACTIVE) {
2909 if (test_bit(CEPH_MDS_R_ASYNC, &req->r_req_flags)) {
2910 err = -EJUKEBOX;
2911 goto finish;
2912 }
2913 dout("do_request no mds or not active, waiting for map\n");
2914 list_add(&req->r_wait, &mdsc->waiting_for_map);
2915 return;
2916 }
2917
2918 /* get, open session */
2919 session = __ceph_lookup_mds_session(mdsc, mds);
2920 if (!session) {
2921 session = register_session(mdsc, mds);
2922 if (IS_ERR(session)) {
2923 err = PTR_ERR(session);
2924 goto finish;
2925 }
2926 }
2927 req->r_session = ceph_get_mds_session(session);
2928
2929 dout("do_request mds%d session %p state %s\n", mds, session,
2930 ceph_session_state_name(session->s_state));
2931
2932 /*
2933 * The old ceph will crash the MDSs when see unknown OPs
2934 */
2935 if (req->r_feature_needed > 0 &&
2936 !test_bit(req->r_feature_needed, &session->s_features)) {
2937 err = -EOPNOTSUPP;
2938 goto out_session;
2939 }
2940
2941 if (session->s_state != CEPH_MDS_SESSION_OPEN &&
2942 session->s_state != CEPH_MDS_SESSION_HUNG) {
2943 /*
2944 * We cannot queue async requests since the caps and delegated
2945 * inodes are bound to the session. Just return -EJUKEBOX and
2946 * let the caller retry a sync request in that case.
2947 */
2948 if (test_bit(CEPH_MDS_R_ASYNC, &req->r_req_flags)) {
2949 err = -EJUKEBOX;
2950 goto out_session;
2951 }
2952
2953 /*
2954 * If the session has been REJECTED, then return a hard error,
2955 * unless it's a CLEANRECOVER mount, in which case we'll queue
2956 * it to the mdsc queue.
2957 */
2958 if (session->s_state == CEPH_MDS_SESSION_REJECTED) {
2959 if (ceph_test_mount_opt(mdsc->fsc, CLEANRECOVER))
2960 list_add(&req->r_wait, &mdsc->waiting_for_map);
2961 else
2962 err = -EACCES;
2963 goto out_session;
2964 }
2965
2966 if (session->s_state == CEPH_MDS_SESSION_NEW ||
2967 session->s_state == CEPH_MDS_SESSION_CLOSING) {
2968 err = __open_session(mdsc, session);
2969 if (err)
2970 goto out_session;
2971 /* retry the same mds later */
2972 if (random)
2973 req->r_resend_mds = mds;
2974 }
2975 list_add(&req->r_wait, &session->s_waiting);
2976 goto out_session;
2977 }
2978
2979 /* send request */
2980 req->r_resend_mds = -1; /* forget any previous mds hint */
2981
2982 if (req->r_request_started == 0) /* note request start time */
2983 req->r_request_started = jiffies;
2984
2985 /*
2986 * For async create we will choose the auth MDS of frag in parent
2987 * directory to send the request and ususally this works fine, but
2988 * if the migrated the dirtory to another MDS before it could handle
2989 * it the request will be forwarded.
2990 *
2991 * And then the auth cap will be changed.
2992 */
2993 if (test_bit(CEPH_MDS_R_ASYNC, &req->r_req_flags) && req->r_num_fwd) {
2994 struct ceph_dentry_info *di = ceph_dentry(req->r_dentry);
2995 struct ceph_inode_info *ci;
2996 struct ceph_cap *cap;
2997
2998 /*
2999 * The request maybe handled very fast and the new inode
3000 * hasn't been linked to the dentry yet. We need to wait
3001 * for the ceph_finish_async_create(), which shouldn't be
3002 * stuck too long or fail in thoery, to finish when forwarding
3003 * the request.
3004 */
3005 if (!d_inode(req->r_dentry)) {
3006 err = wait_on_bit(&di->flags, CEPH_DENTRY_ASYNC_CREATE_BIT,
3007 TASK_KILLABLE);
3008 if (err) {
3009 mutex_lock(&req->r_fill_mutex);
3010 set_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags);
3011 mutex_unlock(&req->r_fill_mutex);
3012 goto out_session;
3013 }
3014 }
3015
3016 ci = ceph_inode(d_inode(req->r_dentry));
3017
3018 spin_lock(&ci->i_ceph_lock);
3019 cap = ci->i_auth_cap;
3020 if (ci->i_ceph_flags & CEPH_I_ASYNC_CREATE && mds != cap->mds) {
3021 dout("do_request session changed for auth cap %d -> %d\n",
3022 cap->session->s_mds, session->s_mds);
3023
3024 /* Remove the auth cap from old session */
3025 spin_lock(&cap->session->s_cap_lock);
3026 cap->session->s_nr_caps--;
3027 list_del_init(&cap->session_caps);
3028 spin_unlock(&cap->session->s_cap_lock);
3029
3030 /* Add the auth cap to the new session */
3031 cap->mds = mds;
3032 cap->session = session;
3033 spin_lock(&session->s_cap_lock);
3034 session->s_nr_caps++;
3035 list_add_tail(&cap->session_caps, &session->s_caps);
3036 spin_unlock(&session->s_cap_lock);
3037
3038 change_auth_cap_ses(ci, session);
3039 }
3040 spin_unlock(&ci->i_ceph_lock);
3041 }
3042
3043 err = __send_request(session, req, false);
3044
3045out_session:
3046 ceph_put_mds_session(session);
3047finish:
3048 if (err) {
3049 dout("__do_request early error %d\n", err);
3050 req->r_err = err;
3051 complete_request(mdsc, req);
3052 __unregister_request(mdsc, req);
3053 }
3054 return;
3055}
3056
3057/*
3058 * called under mdsc->mutex
3059 */
3060static void __wake_requests(struct ceph_mds_client *mdsc,
3061 struct list_head *head)
3062{
3063 struct ceph_mds_request *req;
3064 LIST_HEAD(tmp_list);
3065
3066 list_splice_init(head, &tmp_list);
3067
3068 while (!list_empty(&tmp_list)) {
3069 req = list_entry(tmp_list.next,
3070 struct ceph_mds_request, r_wait);
3071 list_del_init(&req->r_wait);
3072 dout(" wake request %p tid %llu\n", req, req->r_tid);
3073 __do_request(mdsc, req);
3074 }
3075}
3076
3077/*
3078 * Wake up threads with requests pending for @mds, so that they can
3079 * resubmit their requests to a possibly different mds.
3080 */
3081static void kick_requests(struct ceph_mds_client *mdsc, int mds)
3082{
3083 struct ceph_mds_request *req;
3084 struct rb_node *p = rb_first(&mdsc->request_tree);
3085
3086 dout("kick_requests mds%d\n", mds);
3087 while (p) {
3088 req = rb_entry(p, struct ceph_mds_request, r_node);
3089 p = rb_next(p);
3090 if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags))
3091 continue;
3092 if (req->r_attempts > 0)
3093 continue; /* only new requests */
3094 if (req->r_session &&
3095 req->r_session->s_mds == mds) {
3096 dout(" kicking tid %llu\n", req->r_tid);
3097 list_del_init(&req->r_wait);
3098 __do_request(mdsc, req);
3099 }
3100 }
3101}
3102
3103int ceph_mdsc_submit_request(struct ceph_mds_client *mdsc, struct inode *dir,
3104 struct ceph_mds_request *req)
3105{
3106 int err = 0;
3107
3108 /* take CAP_PIN refs for r_inode, r_parent, r_old_dentry */
3109 if (req->r_inode)
3110 ceph_get_cap_refs(ceph_inode(req->r_inode), CEPH_CAP_PIN);
3111 if (req->r_parent) {
3112 struct ceph_inode_info *ci = ceph_inode(req->r_parent);
3113 int fmode = (req->r_op & CEPH_MDS_OP_WRITE) ?
3114 CEPH_FILE_MODE_WR : CEPH_FILE_MODE_RD;
3115 spin_lock(&ci->i_ceph_lock);
3116 ceph_take_cap_refs(ci, CEPH_CAP_PIN, false);
3117 __ceph_touch_fmode(ci, mdsc, fmode);
3118 spin_unlock(&ci->i_ceph_lock);
3119 }
3120 if (req->r_old_dentry_dir)
3121 ceph_get_cap_refs(ceph_inode(req->r_old_dentry_dir),
3122 CEPH_CAP_PIN);
3123
3124 if (req->r_inode) {
3125 err = ceph_wait_on_async_create(req->r_inode);
3126 if (err) {
3127 dout("%s: wait for async create returned: %d\n",
3128 __func__, err);
3129 return err;
3130 }
3131 }
3132
3133 if (!err && req->r_old_inode) {
3134 err = ceph_wait_on_async_create(req->r_old_inode);
3135 if (err) {
3136 dout("%s: wait for async create returned: %d\n",
3137 __func__, err);
3138 return err;
3139 }
3140 }
3141
3142 dout("submit_request on %p for inode %p\n", req, dir);
3143 mutex_lock(&mdsc->mutex);
3144 __register_request(mdsc, req, dir);
3145 __do_request(mdsc, req);
3146 err = req->r_err;
3147 mutex_unlock(&mdsc->mutex);
3148 return err;
3149}
3150
3151int ceph_mdsc_wait_request(struct ceph_mds_client *mdsc,
3152 struct ceph_mds_request *req,
3153 ceph_mds_request_wait_callback_t wait_func)
3154{
3155 int err;
3156
3157 /* wait */
3158 dout("do_request waiting\n");
3159 if (wait_func) {
3160 err = wait_func(mdsc, req);
3161 } else {
3162 long timeleft = wait_for_completion_killable_timeout(
3163 &req->r_completion,
3164 ceph_timeout_jiffies(req->r_timeout));
3165 if (timeleft > 0)
3166 err = 0;
3167 else if (!timeleft)
3168 err = -ETIMEDOUT; /* timed out */
3169 else
3170 err = timeleft; /* killed */
3171 }
3172 dout("do_request waited, got %d\n", err);
3173 mutex_lock(&mdsc->mutex);
3174
3175 /* only abort if we didn't race with a real reply */
3176 if (test_bit(CEPH_MDS_R_GOT_RESULT, &req->r_req_flags)) {
3177 err = le32_to_cpu(req->r_reply_info.head->result);
3178 } else if (err < 0) {
3179 dout("aborted request %lld with %d\n", req->r_tid, err);
3180
3181 /*
3182 * ensure we aren't running concurrently with
3183 * ceph_fill_trace or ceph_readdir_prepopulate, which
3184 * rely on locks (dir mutex) held by our caller.
3185 */
3186 mutex_lock(&req->r_fill_mutex);
3187 req->r_err = err;
3188 set_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags);
3189 mutex_unlock(&req->r_fill_mutex);
3190
3191 if (req->r_parent &&
3192 (req->r_op & CEPH_MDS_OP_WRITE))
3193 ceph_invalidate_dir_request(req);
3194 } else {
3195 err = req->r_err;
3196 }
3197
3198 mutex_unlock(&mdsc->mutex);
3199 return err;
3200}
3201
3202/*
3203 * Synchrously perform an mds request. Take care of all of the
3204 * session setup, forwarding, retry details.
3205 */
3206int ceph_mdsc_do_request(struct ceph_mds_client *mdsc,
3207 struct inode *dir,
3208 struct ceph_mds_request *req)
3209{
3210 int err;
3211
3212 dout("do_request on %p\n", req);
3213
3214 /* issue */
3215 err = ceph_mdsc_submit_request(mdsc, dir, req);
3216 if (!err)
3217 err = ceph_mdsc_wait_request(mdsc, req, NULL);
3218 dout("do_request %p done, result %d\n", req, err);
3219 return err;
3220}
3221
3222/*
3223 * Invalidate dir's completeness, dentry lease state on an aborted MDS
3224 * namespace request.
3225 */
3226void ceph_invalidate_dir_request(struct ceph_mds_request *req)
3227{
3228 struct inode *dir = req->r_parent;
3229 struct inode *old_dir = req->r_old_dentry_dir;
3230
3231 dout("invalidate_dir_request %p %p (complete, lease(s))\n", dir, old_dir);
3232
3233 ceph_dir_clear_complete(dir);
3234 if (old_dir)
3235 ceph_dir_clear_complete(old_dir);
3236 if (req->r_dentry)
3237 ceph_invalidate_dentry_lease(req->r_dentry);
3238 if (req->r_old_dentry)
3239 ceph_invalidate_dentry_lease(req->r_old_dentry);
3240}
3241
3242/*
3243 * Handle mds reply.
3244 *
3245 * We take the session mutex and parse and process the reply immediately.
3246 * This preserves the logical ordering of replies, capabilities, etc., sent
3247 * by the MDS as they are applied to our local cache.
3248 */
3249static void handle_reply(struct ceph_mds_session *session, struct ceph_msg *msg)
3250{
3251 struct ceph_mds_client *mdsc = session->s_mdsc;
3252 struct ceph_mds_request *req;
3253 struct ceph_mds_reply_head *head = msg->front.iov_base;
3254 struct ceph_mds_reply_info_parsed *rinfo; /* parsed reply info */
3255 struct ceph_snap_realm *realm;
3256 u64 tid;
3257 int err, result;
3258 int mds = session->s_mds;
3259 bool close_sessions = false;
3260
3261 if (msg->front.iov_len < sizeof(*head)) {
3262 pr_err("mdsc_handle_reply got corrupt (short) reply\n");
3263 ceph_msg_dump(msg);
3264 return;
3265 }
3266
3267 /* get request, session */
3268 tid = le64_to_cpu(msg->hdr.tid);
3269 mutex_lock(&mdsc->mutex);
3270 req = lookup_get_request(mdsc, tid);
3271 if (!req) {
3272 dout("handle_reply on unknown tid %llu\n", tid);
3273 mutex_unlock(&mdsc->mutex);
3274 return;
3275 }
3276 dout("handle_reply %p\n", req);
3277
3278 /* correct session? */
3279 if (req->r_session != session) {
3280 pr_err("mdsc_handle_reply got %llu on session mds%d"
3281 " not mds%d\n", tid, session->s_mds,
3282 req->r_session ? req->r_session->s_mds : -1);
3283 mutex_unlock(&mdsc->mutex);
3284 goto out;
3285 }
3286
3287 /* dup? */
3288 if ((test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags) && !head->safe) ||
3289 (test_bit(CEPH_MDS_R_GOT_SAFE, &req->r_req_flags) && head->safe)) {
3290 pr_warn("got a dup %s reply on %llu from mds%d\n",
3291 head->safe ? "safe" : "unsafe", tid, mds);
3292 mutex_unlock(&mdsc->mutex);
3293 goto out;
3294 }
3295 if (test_bit(CEPH_MDS_R_GOT_SAFE, &req->r_req_flags)) {
3296 pr_warn("got unsafe after safe on %llu from mds%d\n",
3297 tid, mds);
3298 mutex_unlock(&mdsc->mutex);
3299 goto out;
3300 }
3301
3302 result = le32_to_cpu(head->result);
3303
3304 if (head->safe) {
3305 set_bit(CEPH_MDS_R_GOT_SAFE, &req->r_req_flags);
3306 __unregister_request(mdsc, req);
3307
3308 /* last request during umount? */
3309 if (mdsc->stopping && !__get_oldest_req(mdsc))
3310 complete_all(&mdsc->safe_umount_waiters);
3311
3312 if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) {
3313 /*
3314 * We already handled the unsafe response, now do the
3315 * cleanup. No need to examine the response; the MDS
3316 * doesn't include any result info in the safe
3317 * response. And even if it did, there is nothing
3318 * useful we could do with a revised return value.
3319 */
3320 dout("got safe reply %llu, mds%d\n", tid, mds);
3321
3322 mutex_unlock(&mdsc->mutex);
3323 goto out;
3324 }
3325 } else {
3326 set_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags);
3327 list_add_tail(&req->r_unsafe_item, &req->r_session->s_unsafe);
3328 }
3329
3330 dout("handle_reply tid %lld result %d\n", tid, result);
3331 rinfo = &req->r_reply_info;
3332 if (test_bit(CEPHFS_FEATURE_REPLY_ENCODING, &session->s_features))
3333 err = parse_reply_info(session, msg, rinfo, (u64)-1);
3334 else
3335 err = parse_reply_info(session, msg, rinfo, session->s_con.peer_features);
3336 mutex_unlock(&mdsc->mutex);
3337
3338 /* Must find target inode outside of mutexes to avoid deadlocks */
3339 if ((err >= 0) && rinfo->head->is_target) {
3340 struct inode *in;
3341 struct ceph_vino tvino = {
3342 .ino = le64_to_cpu(rinfo->targeti.in->ino),
3343 .snap = le64_to_cpu(rinfo->targeti.in->snapid)
3344 };
3345
3346 in = ceph_get_inode(mdsc->fsc->sb, tvino);
3347 if (IS_ERR(in)) {
3348 err = PTR_ERR(in);
3349 mutex_lock(&session->s_mutex);
3350 goto out_err;
3351 }
3352 req->r_target_inode = in;
3353 }
3354
3355 mutex_lock(&session->s_mutex);
3356 if (err < 0) {
3357 pr_err("mdsc_handle_reply got corrupt reply mds%d(tid:%lld)\n", mds, tid);
3358 ceph_msg_dump(msg);
3359 goto out_err;
3360 }
3361
3362 /* snap trace */
3363 realm = NULL;
3364 if (rinfo->snapblob_len) {
3365 down_write(&mdsc->snap_rwsem);
3366 err = ceph_update_snap_trace(mdsc, rinfo->snapblob,
3367 rinfo->snapblob + rinfo->snapblob_len,
3368 le32_to_cpu(head->op) == CEPH_MDS_OP_RMSNAP,
3369 &realm);
3370 if (err) {
3371 up_write(&mdsc->snap_rwsem);
3372 close_sessions = true;
3373 if (err == -EIO)
3374 ceph_msg_dump(msg);
3375 goto out_err;
3376 }
3377 downgrade_write(&mdsc->snap_rwsem);
3378 } else {
3379 down_read(&mdsc->snap_rwsem);
3380 }
3381
3382 /* insert trace into our cache */
3383 mutex_lock(&req->r_fill_mutex);
3384 current->journal_info = req;
3385 err = ceph_fill_trace(mdsc->fsc->sb, req);
3386 if (err == 0) {
3387 if (result == 0 && (req->r_op == CEPH_MDS_OP_READDIR ||
3388 req->r_op == CEPH_MDS_OP_LSSNAP))
3389 ceph_readdir_prepopulate(req, req->r_session);
3390 }
3391 current->journal_info = NULL;
3392 mutex_unlock(&req->r_fill_mutex);
3393
3394 up_read(&mdsc->snap_rwsem);
3395 if (realm)
3396 ceph_put_snap_realm(mdsc, realm);
3397
3398 if (err == 0) {
3399 if (req->r_target_inode &&
3400 test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) {
3401 struct ceph_inode_info *ci =
3402 ceph_inode(req->r_target_inode);
3403 spin_lock(&ci->i_unsafe_lock);
3404 list_add_tail(&req->r_unsafe_target_item,
3405 &ci->i_unsafe_iops);
3406 spin_unlock(&ci->i_unsafe_lock);
3407 }
3408
3409 ceph_unreserve_caps(mdsc, &req->r_caps_reservation);
3410 }
3411out_err:
3412 mutex_lock(&mdsc->mutex);
3413 if (!test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags)) {
3414 if (err) {
3415 req->r_err = err;
3416 } else {
3417 req->r_reply = ceph_msg_get(msg);
3418 set_bit(CEPH_MDS_R_GOT_RESULT, &req->r_req_flags);
3419 }
3420 } else {
3421 dout("reply arrived after request %lld was aborted\n", tid);
3422 }
3423 mutex_unlock(&mdsc->mutex);
3424
3425 mutex_unlock(&session->s_mutex);
3426
3427 /* kick calling process */
3428 complete_request(mdsc, req);
3429
3430 ceph_update_metadata_metrics(&mdsc->metric, req->r_start_latency,
3431 req->r_end_latency, err);
3432out:
3433 ceph_mdsc_put_request(req);
3434
3435 /* Defer closing the sessions after s_mutex lock being released */
3436 if (close_sessions)
3437 ceph_mdsc_close_sessions(mdsc);
3438 return;
3439}
3440
3441
3442
3443/*
3444 * handle mds notification that our request has been forwarded.
3445 */
3446static void handle_forward(struct ceph_mds_client *mdsc,
3447 struct ceph_mds_session *session,
3448 struct ceph_msg *msg)
3449{
3450 struct ceph_mds_request *req;
3451 u64 tid = le64_to_cpu(msg->hdr.tid);
3452 u32 next_mds;
3453 u32 fwd_seq;
3454 int err = -EINVAL;
3455 void *p = msg->front.iov_base;
3456 void *end = p + msg->front.iov_len;
3457 bool aborted = false;
3458
3459 ceph_decode_need(&p, end, 2*sizeof(u32), bad);
3460 next_mds = ceph_decode_32(&p);
3461 fwd_seq = ceph_decode_32(&p);
3462
3463 mutex_lock(&mdsc->mutex);
3464 req = lookup_get_request(mdsc, tid);
3465 if (!req) {
3466 mutex_unlock(&mdsc->mutex);
3467 dout("forward tid %llu to mds%d - req dne\n", tid, next_mds);
3468 return; /* dup reply? */
3469 }
3470
3471 if (test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags)) {
3472 dout("forward tid %llu aborted, unregistering\n", tid);
3473 __unregister_request(mdsc, req);
3474 } else if (fwd_seq <= req->r_num_fwd) {
3475 /*
3476 * The type of 'num_fwd' in ceph 'MClientRequestForward'
3477 * is 'int32_t', while in 'ceph_mds_request_head' the
3478 * type is '__u8'. So in case the request bounces between
3479 * MDSes exceeding 256 times, the client will get stuck.
3480 *
3481 * In this case it's ususally a bug in MDS and continue
3482 * bouncing the request makes no sense.
3483 *
3484 * In future this could be fixed in ceph code, so avoid
3485 * using the hardcode here.
3486 */
3487 int max = sizeof_field(struct ceph_mds_request_head, num_fwd);
3488 max = 1 << (max * BITS_PER_BYTE);
3489 if (req->r_num_fwd >= max) {
3490 mutex_lock(&req->r_fill_mutex);
3491 req->r_err = -EMULTIHOP;
3492 set_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags);
3493 mutex_unlock(&req->r_fill_mutex);
3494 aborted = true;
3495 pr_warn_ratelimited("forward tid %llu seq overflow\n",
3496 tid);
3497 } else {
3498 dout("forward tid %llu to mds%d - old seq %d <= %d\n",
3499 tid, next_mds, req->r_num_fwd, fwd_seq);
3500 }
3501 } else {
3502 /* resend. forward race not possible; mds would drop */
3503 dout("forward tid %llu to mds%d (we resend)\n", tid, next_mds);
3504 BUG_ON(req->r_err);
3505 BUG_ON(test_bit(CEPH_MDS_R_GOT_RESULT, &req->r_req_flags));
3506 req->r_attempts = 0;
3507 req->r_num_fwd = fwd_seq;
3508 req->r_resend_mds = next_mds;
3509 put_request_session(req);
3510 __do_request(mdsc, req);
3511 }
3512 mutex_unlock(&mdsc->mutex);
3513
3514 /* kick calling process */
3515 if (aborted)
3516 complete_request(mdsc, req);
3517 ceph_mdsc_put_request(req);
3518 return;
3519
3520bad:
3521 pr_err("mdsc_handle_forward decode error err=%d\n", err);
3522}
3523
3524static int __decode_session_metadata(void **p, void *end,
3525 bool *blocklisted)
3526{
3527 /* map<string,string> */
3528 u32 n;
3529 bool err_str;
3530 ceph_decode_32_safe(p, end, n, bad);
3531 while (n-- > 0) {
3532 u32 len;
3533 ceph_decode_32_safe(p, end, len, bad);
3534 ceph_decode_need(p, end, len, bad);
3535 err_str = !strncmp(*p, "error_string", len);
3536 *p += len;
3537 ceph_decode_32_safe(p, end, len, bad);
3538 ceph_decode_need(p, end, len, bad);
3539 /*
3540 * Match "blocklisted (blacklisted)" from newer MDSes,
3541 * or "blacklisted" from older MDSes.
3542 */
3543 if (err_str && strnstr(*p, "blacklisted", len))
3544 *blocklisted = true;
3545 *p += len;
3546 }
3547 return 0;
3548bad:
3549 return -1;
3550}
3551
3552/*
3553 * handle a mds session control message
3554 */
3555static void handle_session(struct ceph_mds_session *session,
3556 struct ceph_msg *msg)
3557{
3558 struct ceph_mds_client *mdsc = session->s_mdsc;
3559 int mds = session->s_mds;
3560 int msg_version = le16_to_cpu(msg->hdr.version);
3561 void *p = msg->front.iov_base;
3562 void *end = p + msg->front.iov_len;
3563 struct ceph_mds_session_head *h;
3564 u32 op;
3565 u64 seq, features = 0;
3566 int wake = 0;
3567 bool blocklisted = false;
3568
3569 /* decode */
3570 ceph_decode_need(&p, end, sizeof(*h), bad);
3571 h = p;
3572 p += sizeof(*h);
3573
3574 op = le32_to_cpu(h->op);
3575 seq = le64_to_cpu(h->seq);
3576
3577 if (msg_version >= 3) {
3578 u32 len;
3579 /* version >= 2 and < 5, decode metadata, skip otherwise
3580 * as it's handled via flags.
3581 */
3582 if (msg_version >= 5)
3583 ceph_decode_skip_map(&p, end, string, string, bad);
3584 else if (__decode_session_metadata(&p, end, &blocklisted) < 0)
3585 goto bad;
3586
3587 /* version >= 3, feature bits */
3588 ceph_decode_32_safe(&p, end, len, bad);
3589 if (len) {
3590 ceph_decode_64_safe(&p, end, features, bad);
3591 p += len - sizeof(features);
3592 }
3593 }
3594
3595 if (msg_version >= 5) {
3596 u32 flags, len;
3597
3598 /* version >= 4 */
3599 ceph_decode_skip_16(&p, end, bad); /* struct_v, struct_cv */
3600 ceph_decode_32_safe(&p, end, len, bad); /* len */
3601 ceph_decode_skip_n(&p, end, len, bad); /* metric_spec */
3602
3603 /* version >= 5, flags */
3604 ceph_decode_32_safe(&p, end, flags, bad);
3605 if (flags & CEPH_SESSION_BLOCKLISTED) {
3606 pr_warn("mds%d session blocklisted\n", session->s_mds);
3607 blocklisted = true;
3608 }
3609 }
3610
3611 mutex_lock(&mdsc->mutex);
3612 if (op == CEPH_SESSION_CLOSE) {
3613 ceph_get_mds_session(session);
3614 __unregister_session(mdsc, session);
3615 }
3616 /* FIXME: this ttl calculation is generous */
3617 session->s_ttl = jiffies + HZ*mdsc->mdsmap->m_session_autoclose;
3618 mutex_unlock(&mdsc->mutex);
3619
3620 mutex_lock(&session->s_mutex);
3621
3622 dout("handle_session mds%d %s %p state %s seq %llu\n",
3623 mds, ceph_session_op_name(op), session,
3624 ceph_session_state_name(session->s_state), seq);
3625
3626 if (session->s_state == CEPH_MDS_SESSION_HUNG) {
3627 session->s_state = CEPH_MDS_SESSION_OPEN;
3628 pr_info("mds%d came back\n", session->s_mds);
3629 }
3630
3631 switch (op) {
3632 case CEPH_SESSION_OPEN:
3633 if (session->s_state == CEPH_MDS_SESSION_RECONNECTING)
3634 pr_info("mds%d reconnect success\n", session->s_mds);
3635
3636 if (session->s_state == CEPH_MDS_SESSION_OPEN) {
3637 pr_notice("mds%d is already opened\n", session->s_mds);
3638 } else {
3639 session->s_state = CEPH_MDS_SESSION_OPEN;
3640 session->s_features = features;
3641 renewed_caps(mdsc, session, 0);
3642 if (test_bit(CEPHFS_FEATURE_METRIC_COLLECT,
3643 &session->s_features))
3644 metric_schedule_delayed(&mdsc->metric);
3645 }
3646
3647 /*
3648 * The connection maybe broken and the session in client
3649 * side has been reinitialized, need to update the seq
3650 * anyway.
3651 */
3652 if (!session->s_seq && seq)
3653 session->s_seq = seq;
3654
3655 wake = 1;
3656 if (mdsc->stopping)
3657 __close_session(mdsc, session);
3658 break;
3659
3660 case CEPH_SESSION_RENEWCAPS:
3661 if (session->s_renew_seq == seq)
3662 renewed_caps(mdsc, session, 1);
3663 break;
3664
3665 case CEPH_SESSION_CLOSE:
3666 if (session->s_state == CEPH_MDS_SESSION_RECONNECTING)
3667 pr_info("mds%d reconnect denied\n", session->s_mds);
3668 session->s_state = CEPH_MDS_SESSION_CLOSED;
3669 cleanup_session_requests(mdsc, session);
3670 remove_session_caps(session);
3671 wake = 2; /* for good measure */
3672 wake_up_all(&mdsc->session_close_wq);
3673 break;
3674
3675 case CEPH_SESSION_STALE:
3676 pr_info("mds%d caps went stale, renewing\n",
3677 session->s_mds);
3678 atomic_inc(&session->s_cap_gen);
3679 session->s_cap_ttl = jiffies - 1;
3680 send_renew_caps(mdsc, session);
3681 break;
3682
3683 case CEPH_SESSION_RECALL_STATE:
3684 ceph_trim_caps(mdsc, session, le32_to_cpu(h->max_caps));
3685 break;
3686
3687 case CEPH_SESSION_FLUSHMSG:
3688 /* flush cap releases */
3689 spin_lock(&session->s_cap_lock);
3690 if (session->s_num_cap_releases)
3691 ceph_flush_cap_releases(mdsc, session);
3692 spin_unlock(&session->s_cap_lock);
3693
3694 send_flushmsg_ack(mdsc, session, seq);
3695 break;
3696
3697 case CEPH_SESSION_FORCE_RO:
3698 dout("force_session_readonly %p\n", session);
3699 spin_lock(&session->s_cap_lock);
3700 session->s_readonly = true;
3701 spin_unlock(&session->s_cap_lock);
3702 wake_up_session_caps(session, FORCE_RO);
3703 break;
3704
3705 case CEPH_SESSION_REJECT:
3706 WARN_ON(session->s_state != CEPH_MDS_SESSION_OPENING);
3707 pr_info("mds%d rejected session\n", session->s_mds);
3708 session->s_state = CEPH_MDS_SESSION_REJECTED;
3709 cleanup_session_requests(mdsc, session);
3710 remove_session_caps(session);
3711 if (blocklisted)
3712 mdsc->fsc->blocklisted = true;
3713 wake = 2; /* for good measure */
3714 break;
3715
3716 default:
3717 pr_err("mdsc_handle_session bad op %d mds%d\n", op, mds);
3718 WARN_ON(1);
3719 }
3720
3721 mutex_unlock(&session->s_mutex);
3722 if (wake) {
3723 mutex_lock(&mdsc->mutex);
3724 __wake_requests(mdsc, &session->s_waiting);
3725 if (wake == 2)
3726 kick_requests(mdsc, mds);
3727 mutex_unlock(&mdsc->mutex);
3728 }
3729 if (op == CEPH_SESSION_CLOSE)
3730 ceph_put_mds_session(session);
3731 return;
3732
3733bad:
3734 pr_err("mdsc_handle_session corrupt message mds%d len %d\n", mds,
3735 (int)msg->front.iov_len);
3736 ceph_msg_dump(msg);
3737 return;
3738}
3739
3740void ceph_mdsc_release_dir_caps(struct ceph_mds_request *req)
3741{
3742 int dcaps;
3743
3744 dcaps = xchg(&req->r_dir_caps, 0);
3745 if (dcaps) {
3746 dout("releasing r_dir_caps=%s\n", ceph_cap_string(dcaps));
3747 ceph_put_cap_refs(ceph_inode(req->r_parent), dcaps);
3748 }
3749}
3750
3751void ceph_mdsc_release_dir_caps_no_check(struct ceph_mds_request *req)
3752{
3753 int dcaps;
3754
3755 dcaps = xchg(&req->r_dir_caps, 0);
3756 if (dcaps) {
3757 dout("releasing r_dir_caps=%s\n", ceph_cap_string(dcaps));
3758 ceph_put_cap_refs_no_check_caps(ceph_inode(req->r_parent),
3759 dcaps);
3760 }
3761}
3762
3763/*
3764 * called under session->mutex.
3765 */
3766static void replay_unsafe_requests(struct ceph_mds_client *mdsc,
3767 struct ceph_mds_session *session)
3768{
3769 struct ceph_mds_request *req, *nreq;
3770 struct rb_node *p;
3771
3772 dout("replay_unsafe_requests mds%d\n", session->s_mds);
3773
3774 mutex_lock(&mdsc->mutex);
3775 list_for_each_entry_safe(req, nreq, &session->s_unsafe, r_unsafe_item)
3776 __send_request(session, req, true);
3777
3778 /*
3779 * also re-send old requests when MDS enters reconnect stage. So that MDS
3780 * can process completed request in clientreplay stage.
3781 */
3782 p = rb_first(&mdsc->request_tree);
3783 while (p) {
3784 req = rb_entry(p, struct ceph_mds_request, r_node);
3785 p = rb_next(p);
3786 if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags))
3787 continue;
3788 if (req->r_attempts == 0)
3789 continue; /* only old requests */
3790 if (!req->r_session)
3791 continue;
3792 if (req->r_session->s_mds != session->s_mds)
3793 continue;
3794
3795 ceph_mdsc_release_dir_caps_no_check(req);
3796
3797 __send_request(session, req, true);
3798 }
3799 mutex_unlock(&mdsc->mutex);
3800}
3801
3802static int send_reconnect_partial(struct ceph_reconnect_state *recon_state)
3803{
3804 struct ceph_msg *reply;
3805 struct ceph_pagelist *_pagelist;
3806 struct page *page;
3807 __le32 *addr;
3808 int err = -ENOMEM;
3809
3810 if (!recon_state->allow_multi)
3811 return -ENOSPC;
3812
3813 /* can't handle message that contains both caps and realm */
3814 BUG_ON(!recon_state->nr_caps == !recon_state->nr_realms);
3815
3816 /* pre-allocate new pagelist */
3817 _pagelist = ceph_pagelist_alloc(GFP_NOFS);
3818 if (!_pagelist)
3819 return -ENOMEM;
3820
3821 reply = ceph_msg_new2(CEPH_MSG_CLIENT_RECONNECT, 0, 1, GFP_NOFS, false);
3822 if (!reply)
3823 goto fail_msg;
3824
3825 /* placeholder for nr_caps */
3826 err = ceph_pagelist_encode_32(_pagelist, 0);
3827 if (err < 0)
3828 goto fail;
3829
3830 if (recon_state->nr_caps) {
3831 /* currently encoding caps */
3832 err = ceph_pagelist_encode_32(recon_state->pagelist, 0);
3833 if (err)
3834 goto fail;
3835 } else {
3836 /* placeholder for nr_realms (currently encoding relams) */
3837 err = ceph_pagelist_encode_32(_pagelist, 0);
3838 if (err < 0)
3839 goto fail;
3840 }
3841
3842 err = ceph_pagelist_encode_8(recon_state->pagelist, 1);
3843 if (err)
3844 goto fail;
3845
3846 page = list_first_entry(&recon_state->pagelist->head, struct page, lru);
3847 addr = kmap_atomic(page);
3848 if (recon_state->nr_caps) {
3849 /* currently encoding caps */
3850 *addr = cpu_to_le32(recon_state->nr_caps);
3851 } else {
3852 /* currently encoding relams */
3853 *(addr + 1) = cpu_to_le32(recon_state->nr_realms);
3854 }
3855 kunmap_atomic(addr);
3856
3857 reply->hdr.version = cpu_to_le16(5);
3858 reply->hdr.compat_version = cpu_to_le16(4);
3859
3860 reply->hdr.data_len = cpu_to_le32(recon_state->pagelist->length);
3861 ceph_msg_data_add_pagelist(reply, recon_state->pagelist);
3862
3863 ceph_con_send(&recon_state->session->s_con, reply);
3864 ceph_pagelist_release(recon_state->pagelist);
3865
3866 recon_state->pagelist = _pagelist;
3867 recon_state->nr_caps = 0;
3868 recon_state->nr_realms = 0;
3869 recon_state->msg_version = 5;
3870 return 0;
3871fail:
3872 ceph_msg_put(reply);
3873fail_msg:
3874 ceph_pagelist_release(_pagelist);
3875 return err;
3876}
3877
3878static struct dentry* d_find_primary(struct inode *inode)
3879{
3880 struct dentry *alias, *dn = NULL;
3881
3882 if (hlist_empty(&inode->i_dentry))
3883 return NULL;
3884
3885 spin_lock(&inode->i_lock);
3886 if (hlist_empty(&inode->i_dentry))
3887 goto out_unlock;
3888
3889 if (S_ISDIR(inode->i_mode)) {
3890 alias = hlist_entry(inode->i_dentry.first, struct dentry, d_u.d_alias);
3891 if (!IS_ROOT(alias))
3892 dn = dget(alias);
3893 goto out_unlock;
3894 }
3895
3896 hlist_for_each_entry(alias, &inode->i_dentry, d_u.d_alias) {
3897 spin_lock(&alias->d_lock);
3898 if (!d_unhashed(alias) &&
3899 (ceph_dentry(alias)->flags & CEPH_DENTRY_PRIMARY_LINK)) {
3900 dn = dget_dlock(alias);
3901 }
3902 spin_unlock(&alias->d_lock);
3903 if (dn)
3904 break;
3905 }
3906out_unlock:
3907 spin_unlock(&inode->i_lock);
3908 return dn;
3909}
3910
3911/*
3912 * Encode information about a cap for a reconnect with the MDS.
3913 */
3914static int reconnect_caps_cb(struct inode *inode, struct ceph_cap *cap,
3915 void *arg)
3916{
3917 union {
3918 struct ceph_mds_cap_reconnect v2;
3919 struct ceph_mds_cap_reconnect_v1 v1;
3920 } rec;
3921 struct ceph_inode_info *ci = cap->ci;
3922 struct ceph_reconnect_state *recon_state = arg;
3923 struct ceph_pagelist *pagelist = recon_state->pagelist;
3924 struct dentry *dentry;
3925 char *path;
3926 int pathlen = 0, err;
3927 u64 pathbase;
3928 u64 snap_follows;
3929
3930 dout(" adding %p ino %llx.%llx cap %p %lld %s\n",
3931 inode, ceph_vinop(inode), cap, cap->cap_id,
3932 ceph_cap_string(cap->issued));
3933
3934 dentry = d_find_primary(inode);
3935 if (dentry) {
3936 /* set pathbase to parent dir when msg_version >= 2 */
3937 path = ceph_mdsc_build_path(dentry, &pathlen, &pathbase,
3938 recon_state->msg_version >= 2);
3939 dput(dentry);
3940 if (IS_ERR(path)) {
3941 err = PTR_ERR(path);
3942 goto out_err;
3943 }
3944 } else {
3945 path = NULL;
3946 pathbase = 0;
3947 }
3948
3949 spin_lock(&ci->i_ceph_lock);
3950 cap->seq = 0; /* reset cap seq */
3951 cap->issue_seq = 0; /* and issue_seq */
3952 cap->mseq = 0; /* and migrate_seq */
3953 cap->cap_gen = atomic_read(&cap->session->s_cap_gen);
3954
3955 /* These are lost when the session goes away */
3956 if (S_ISDIR(inode->i_mode)) {
3957 if (cap->issued & CEPH_CAP_DIR_CREATE) {
3958 ceph_put_string(rcu_dereference_raw(ci->i_cached_layout.pool_ns));
3959 memset(&ci->i_cached_layout, 0, sizeof(ci->i_cached_layout));
3960 }
3961 cap->issued &= ~CEPH_CAP_ANY_DIR_OPS;
3962 }
3963
3964 if (recon_state->msg_version >= 2) {
3965 rec.v2.cap_id = cpu_to_le64(cap->cap_id);
3966 rec.v2.wanted = cpu_to_le32(__ceph_caps_wanted(ci));
3967 rec.v2.issued = cpu_to_le32(cap->issued);
3968 rec.v2.snaprealm = cpu_to_le64(ci->i_snap_realm->ino);
3969 rec.v2.pathbase = cpu_to_le64(pathbase);
3970 rec.v2.flock_len = (__force __le32)
3971 ((ci->i_ceph_flags & CEPH_I_ERROR_FILELOCK) ? 0 : 1);
3972 } else {
3973 rec.v1.cap_id = cpu_to_le64(cap->cap_id);
3974 rec.v1.wanted = cpu_to_le32(__ceph_caps_wanted(ci));
3975 rec.v1.issued = cpu_to_le32(cap->issued);
3976 rec.v1.size = cpu_to_le64(i_size_read(inode));
3977 ceph_encode_timespec64(&rec.v1.mtime, &inode->i_mtime);
3978 ceph_encode_timespec64(&rec.v1.atime, &inode->i_atime);
3979 rec.v1.snaprealm = cpu_to_le64(ci->i_snap_realm->ino);
3980 rec.v1.pathbase = cpu_to_le64(pathbase);
3981 }
3982
3983 if (list_empty(&ci->i_cap_snaps)) {
3984 snap_follows = ci->i_head_snapc ? ci->i_head_snapc->seq : 0;
3985 } else {
3986 struct ceph_cap_snap *capsnap =
3987 list_first_entry(&ci->i_cap_snaps,
3988 struct ceph_cap_snap, ci_item);
3989 snap_follows = capsnap->follows;
3990 }
3991 spin_unlock(&ci->i_ceph_lock);
3992
3993 if (recon_state->msg_version >= 2) {
3994 int num_fcntl_locks, num_flock_locks;
3995 struct ceph_filelock *flocks = NULL;
3996 size_t struct_len, total_len = sizeof(u64);
3997 u8 struct_v = 0;
3998
3999encode_again:
4000 if (rec.v2.flock_len) {
4001 ceph_count_locks(inode, &num_fcntl_locks, &num_flock_locks);
4002 } else {
4003 num_fcntl_locks = 0;
4004 num_flock_locks = 0;
4005 }
4006 if (num_fcntl_locks + num_flock_locks > 0) {
4007 flocks = kmalloc_array(num_fcntl_locks + num_flock_locks,
4008 sizeof(struct ceph_filelock),
4009 GFP_NOFS);
4010 if (!flocks) {
4011 err = -ENOMEM;
4012 goto out_err;
4013 }
4014 err = ceph_encode_locks_to_buffer(inode, flocks,
4015 num_fcntl_locks,
4016 num_flock_locks);
4017 if (err) {
4018 kfree(flocks);
4019 flocks = NULL;
4020 if (err == -ENOSPC)
4021 goto encode_again;
4022 goto out_err;
4023 }
4024 } else {
4025 kfree(flocks);
4026 flocks = NULL;
4027 }
4028
4029 if (recon_state->msg_version >= 3) {
4030 /* version, compat_version and struct_len */
4031 total_len += 2 * sizeof(u8) + sizeof(u32);
4032 struct_v = 2;
4033 }
4034 /*
4035 * number of encoded locks is stable, so copy to pagelist
4036 */
4037 struct_len = 2 * sizeof(u32) +
4038 (num_fcntl_locks + num_flock_locks) *
4039 sizeof(struct ceph_filelock);
4040 rec.v2.flock_len = cpu_to_le32(struct_len);
4041
4042 struct_len += sizeof(u32) + pathlen + sizeof(rec.v2);
4043
4044 if (struct_v >= 2)
4045 struct_len += sizeof(u64); /* snap_follows */
4046
4047 total_len += struct_len;
4048
4049 if (pagelist->length + total_len > RECONNECT_MAX_SIZE) {
4050 err = send_reconnect_partial(recon_state);
4051 if (err)
4052 goto out_freeflocks;
4053 pagelist = recon_state->pagelist;
4054 }
4055
4056 err = ceph_pagelist_reserve(pagelist, total_len);
4057 if (err)
4058 goto out_freeflocks;
4059
4060 ceph_pagelist_encode_64(pagelist, ceph_ino(inode));
4061 if (recon_state->msg_version >= 3) {
4062 ceph_pagelist_encode_8(pagelist, struct_v);
4063 ceph_pagelist_encode_8(pagelist, 1);
4064 ceph_pagelist_encode_32(pagelist, struct_len);
4065 }
4066 ceph_pagelist_encode_string(pagelist, path, pathlen);
4067 ceph_pagelist_append(pagelist, &rec, sizeof(rec.v2));
4068 ceph_locks_to_pagelist(flocks, pagelist,
4069 num_fcntl_locks, num_flock_locks);
4070 if (struct_v >= 2)
4071 ceph_pagelist_encode_64(pagelist, snap_follows);
4072out_freeflocks:
4073 kfree(flocks);
4074 } else {
4075 err = ceph_pagelist_reserve(pagelist,
4076 sizeof(u64) + sizeof(u32) +
4077 pathlen + sizeof(rec.v1));
4078 if (err)
4079 goto out_err;
4080
4081 ceph_pagelist_encode_64(pagelist, ceph_ino(inode));
4082 ceph_pagelist_encode_string(pagelist, path, pathlen);
4083 ceph_pagelist_append(pagelist, &rec, sizeof(rec.v1));
4084 }
4085
4086out_err:
4087 ceph_mdsc_free_path(path, pathlen);
4088 if (!err)
4089 recon_state->nr_caps++;
4090 return err;
4091}
4092
4093static int encode_snap_realms(struct ceph_mds_client *mdsc,
4094 struct ceph_reconnect_state *recon_state)
4095{
4096 struct rb_node *p;
4097 struct ceph_pagelist *pagelist = recon_state->pagelist;
4098 int err = 0;
4099
4100 if (recon_state->msg_version >= 4) {
4101 err = ceph_pagelist_encode_32(pagelist, mdsc->num_snap_realms);
4102 if (err < 0)
4103 goto fail;
4104 }
4105
4106 /*
4107 * snaprealms. we provide mds with the ino, seq (version), and
4108 * parent for all of our realms. If the mds has any newer info,
4109 * it will tell us.
4110 */
4111 for (p = rb_first(&mdsc->snap_realms); p; p = rb_next(p)) {
4112 struct ceph_snap_realm *realm =
4113 rb_entry(p, struct ceph_snap_realm, node);
4114 struct ceph_mds_snaprealm_reconnect sr_rec;
4115
4116 if (recon_state->msg_version >= 4) {
4117 size_t need = sizeof(u8) * 2 + sizeof(u32) +
4118 sizeof(sr_rec);
4119
4120 if (pagelist->length + need > RECONNECT_MAX_SIZE) {
4121 err = send_reconnect_partial(recon_state);
4122 if (err)
4123 goto fail;
4124 pagelist = recon_state->pagelist;
4125 }
4126
4127 err = ceph_pagelist_reserve(pagelist, need);
4128 if (err)
4129 goto fail;
4130
4131 ceph_pagelist_encode_8(pagelist, 1);
4132 ceph_pagelist_encode_8(pagelist, 1);
4133 ceph_pagelist_encode_32(pagelist, sizeof(sr_rec));
4134 }
4135
4136 dout(" adding snap realm %llx seq %lld parent %llx\n",
4137 realm->ino, realm->seq, realm->parent_ino);
4138 sr_rec.ino = cpu_to_le64(realm->ino);
4139 sr_rec.seq = cpu_to_le64(realm->seq);
4140 sr_rec.parent = cpu_to_le64(realm->parent_ino);
4141
4142 err = ceph_pagelist_append(pagelist, &sr_rec, sizeof(sr_rec));
4143 if (err)
4144 goto fail;
4145
4146 recon_state->nr_realms++;
4147 }
4148fail:
4149 return err;
4150}
4151
4152
4153/*
4154 * If an MDS fails and recovers, clients need to reconnect in order to
4155 * reestablish shared state. This includes all caps issued through
4156 * this session _and_ the snap_realm hierarchy. Because it's not
4157 * clear which snap realms the mds cares about, we send everything we
4158 * know about.. that ensures we'll then get any new info the
4159 * recovering MDS might have.
4160 *
4161 * This is a relatively heavyweight operation, but it's rare.
4162 */
4163static void send_mds_reconnect(struct ceph_mds_client *mdsc,
4164 struct ceph_mds_session *session)
4165{
4166 struct ceph_msg *reply;
4167 int mds = session->s_mds;
4168 int err = -ENOMEM;
4169 struct ceph_reconnect_state recon_state = {
4170 .session = session,
4171 };
4172 LIST_HEAD(dispose);
4173
4174 pr_info("mds%d reconnect start\n", mds);
4175
4176 recon_state.pagelist = ceph_pagelist_alloc(GFP_NOFS);
4177 if (!recon_state.pagelist)
4178 goto fail_nopagelist;
4179
4180 reply = ceph_msg_new2(CEPH_MSG_CLIENT_RECONNECT, 0, 1, GFP_NOFS, false);
4181 if (!reply)
4182 goto fail_nomsg;
4183
4184 xa_destroy(&session->s_delegated_inos);
4185
4186 mutex_lock(&session->s_mutex);
4187 session->s_state = CEPH_MDS_SESSION_RECONNECTING;
4188 session->s_seq = 0;
4189
4190 dout("session %p state %s\n", session,
4191 ceph_session_state_name(session->s_state));
4192
4193 atomic_inc(&session->s_cap_gen);
4194
4195 spin_lock(&session->s_cap_lock);
4196 /* don't know if session is readonly */
4197 session->s_readonly = 0;
4198 /*
4199 * notify __ceph_remove_cap() that we are composing cap reconnect.
4200 * If a cap get released before being added to the cap reconnect,
4201 * __ceph_remove_cap() should skip queuing cap release.
4202 */
4203 session->s_cap_reconnect = 1;
4204 /* drop old cap expires; we're about to reestablish that state */
4205 detach_cap_releases(session, &dispose);
4206 spin_unlock(&session->s_cap_lock);
4207 dispose_cap_releases(mdsc, &dispose);
4208
4209 /* trim unused caps to reduce MDS's cache rejoin time */
4210 if (mdsc->fsc->sb->s_root)
4211 shrink_dcache_parent(mdsc->fsc->sb->s_root);
4212
4213 ceph_con_close(&session->s_con);
4214 ceph_con_open(&session->s_con,
4215 CEPH_ENTITY_TYPE_MDS, mds,
4216 ceph_mdsmap_get_addr(mdsc->mdsmap, mds));
4217
4218 /* replay unsafe requests */
4219 replay_unsafe_requests(mdsc, session);
4220
4221 ceph_early_kick_flushing_caps(mdsc, session);
4222
4223 down_read(&mdsc->snap_rwsem);
4224
4225 /* placeholder for nr_caps */
4226 err = ceph_pagelist_encode_32(recon_state.pagelist, 0);
4227 if (err)
4228 goto fail;
4229
4230 if (test_bit(CEPHFS_FEATURE_MULTI_RECONNECT, &session->s_features)) {
4231 recon_state.msg_version = 3;
4232 recon_state.allow_multi = true;
4233 } else if (session->s_con.peer_features & CEPH_FEATURE_MDSENC) {
4234 recon_state.msg_version = 3;
4235 } else {
4236 recon_state.msg_version = 2;
4237 }
4238 /* trsaverse this session's caps */
4239 err = ceph_iterate_session_caps(session, reconnect_caps_cb, &recon_state);
4240
4241 spin_lock(&session->s_cap_lock);
4242 session->s_cap_reconnect = 0;
4243 spin_unlock(&session->s_cap_lock);
4244
4245 if (err < 0)
4246 goto fail;
4247
4248 /* check if all realms can be encoded into current message */
4249 if (mdsc->num_snap_realms) {
4250 size_t total_len =
4251 recon_state.pagelist->length +
4252 mdsc->num_snap_realms *
4253 sizeof(struct ceph_mds_snaprealm_reconnect);
4254 if (recon_state.msg_version >= 4) {
4255 /* number of realms */
4256 total_len += sizeof(u32);
4257 /* version, compat_version and struct_len */
4258 total_len += mdsc->num_snap_realms *
4259 (2 * sizeof(u8) + sizeof(u32));
4260 }
4261 if (total_len > RECONNECT_MAX_SIZE) {
4262 if (!recon_state.allow_multi) {
4263 err = -ENOSPC;
4264 goto fail;
4265 }
4266 if (recon_state.nr_caps) {
4267 err = send_reconnect_partial(&recon_state);
4268 if (err)
4269 goto fail;
4270 }
4271 recon_state.msg_version = 5;
4272 }
4273 }
4274
4275 err = encode_snap_realms(mdsc, &recon_state);
4276 if (err < 0)
4277 goto fail;
4278
4279 if (recon_state.msg_version >= 5) {
4280 err = ceph_pagelist_encode_8(recon_state.pagelist, 0);
4281 if (err < 0)
4282 goto fail;
4283 }
4284
4285 if (recon_state.nr_caps || recon_state.nr_realms) {
4286 struct page *page =
4287 list_first_entry(&recon_state.pagelist->head,
4288 struct page, lru);
4289 __le32 *addr = kmap_atomic(page);
4290 if (recon_state.nr_caps) {
4291 WARN_ON(recon_state.nr_realms != mdsc->num_snap_realms);
4292 *addr = cpu_to_le32(recon_state.nr_caps);
4293 } else if (recon_state.msg_version >= 4) {
4294 *(addr + 1) = cpu_to_le32(recon_state.nr_realms);
4295 }
4296 kunmap_atomic(addr);
4297 }
4298
4299 reply->hdr.version = cpu_to_le16(recon_state.msg_version);
4300 if (recon_state.msg_version >= 4)
4301 reply->hdr.compat_version = cpu_to_le16(4);
4302
4303 reply->hdr.data_len = cpu_to_le32(recon_state.pagelist->length);
4304 ceph_msg_data_add_pagelist(reply, recon_state.pagelist);
4305
4306 ceph_con_send(&session->s_con, reply);
4307
4308 mutex_unlock(&session->s_mutex);
4309
4310 mutex_lock(&mdsc->mutex);
4311 __wake_requests(mdsc, &session->s_waiting);
4312 mutex_unlock(&mdsc->mutex);
4313
4314 up_read(&mdsc->snap_rwsem);
4315 ceph_pagelist_release(recon_state.pagelist);
4316 return;
4317
4318fail:
4319 ceph_msg_put(reply);
4320 up_read(&mdsc->snap_rwsem);
4321 mutex_unlock(&session->s_mutex);
4322fail_nomsg:
4323 ceph_pagelist_release(recon_state.pagelist);
4324fail_nopagelist:
4325 pr_err("error %d preparing reconnect for mds%d\n", err, mds);
4326 return;
4327}
4328
4329
4330/*
4331 * compare old and new mdsmaps, kicking requests
4332 * and closing out old connections as necessary
4333 *
4334 * called under mdsc->mutex.
4335 */
4336static void check_new_map(struct ceph_mds_client *mdsc,
4337 struct ceph_mdsmap *newmap,
4338 struct ceph_mdsmap *oldmap)
4339{
4340 int i, j, err;
4341 int oldstate, newstate;
4342 struct ceph_mds_session *s;
4343 unsigned long targets[DIV_ROUND_UP(CEPH_MAX_MDS, sizeof(unsigned long))] = {0};
4344
4345 dout("check_new_map new %u old %u\n",
4346 newmap->m_epoch, oldmap->m_epoch);
4347
4348 if (newmap->m_info) {
4349 for (i = 0; i < newmap->possible_max_rank; i++) {
4350 for (j = 0; j < newmap->m_info[i].num_export_targets; j++)
4351 set_bit(newmap->m_info[i].export_targets[j], targets);
4352 }
4353 }
4354
4355 for (i = 0; i < oldmap->possible_max_rank && i < mdsc->max_sessions; i++) {
4356 if (!mdsc->sessions[i])
4357 continue;
4358 s = mdsc->sessions[i];
4359 oldstate = ceph_mdsmap_get_state(oldmap, i);
4360 newstate = ceph_mdsmap_get_state(newmap, i);
4361
4362 dout("check_new_map mds%d state %s%s -> %s%s (session %s)\n",
4363 i, ceph_mds_state_name(oldstate),
4364 ceph_mdsmap_is_laggy(oldmap, i) ? " (laggy)" : "",
4365 ceph_mds_state_name(newstate),
4366 ceph_mdsmap_is_laggy(newmap, i) ? " (laggy)" : "",
4367 ceph_session_state_name(s->s_state));
4368
4369 if (i >= newmap->possible_max_rank) {
4370 /* force close session for stopped mds */
4371 ceph_get_mds_session(s);
4372 __unregister_session(mdsc, s);
4373 __wake_requests(mdsc, &s->s_waiting);
4374 mutex_unlock(&mdsc->mutex);
4375
4376 mutex_lock(&s->s_mutex);
4377 cleanup_session_requests(mdsc, s);
4378 remove_session_caps(s);
4379 mutex_unlock(&s->s_mutex);
4380
4381 ceph_put_mds_session(s);
4382
4383 mutex_lock(&mdsc->mutex);
4384 kick_requests(mdsc, i);
4385 continue;
4386 }
4387
4388 if (memcmp(ceph_mdsmap_get_addr(oldmap, i),
4389 ceph_mdsmap_get_addr(newmap, i),
4390 sizeof(struct ceph_entity_addr))) {
4391 /* just close it */
4392 mutex_unlock(&mdsc->mutex);
4393 mutex_lock(&s->s_mutex);
4394 mutex_lock(&mdsc->mutex);
4395 ceph_con_close(&s->s_con);
4396 mutex_unlock(&s->s_mutex);
4397 s->s_state = CEPH_MDS_SESSION_RESTARTING;
4398 } else if (oldstate == newstate) {
4399 continue; /* nothing new with this mds */
4400 }
4401
4402 /*
4403 * send reconnect?
4404 */
4405 if (s->s_state == CEPH_MDS_SESSION_RESTARTING &&
4406 newstate >= CEPH_MDS_STATE_RECONNECT) {
4407 mutex_unlock(&mdsc->mutex);
4408 clear_bit(i, targets);
4409 send_mds_reconnect(mdsc, s);
4410 mutex_lock(&mdsc->mutex);
4411 }
4412
4413 /*
4414 * kick request on any mds that has gone active.
4415 */
4416 if (oldstate < CEPH_MDS_STATE_ACTIVE &&
4417 newstate >= CEPH_MDS_STATE_ACTIVE) {
4418 if (oldstate != CEPH_MDS_STATE_CREATING &&
4419 oldstate != CEPH_MDS_STATE_STARTING)
4420 pr_info("mds%d recovery completed\n", s->s_mds);
4421 kick_requests(mdsc, i);
4422 mutex_unlock(&mdsc->mutex);
4423 mutex_lock(&s->s_mutex);
4424 mutex_lock(&mdsc->mutex);
4425 ceph_kick_flushing_caps(mdsc, s);
4426 mutex_unlock(&s->s_mutex);
4427 wake_up_session_caps(s, RECONNECT);
4428 }
4429 }
4430
4431 /*
4432 * Only open and reconnect sessions that don't exist yet.
4433 */
4434 for (i = 0; i < newmap->possible_max_rank; i++) {
4435 /*
4436 * In case the import MDS is crashed just after
4437 * the EImportStart journal is flushed, so when
4438 * a standby MDS takes over it and is replaying
4439 * the EImportStart journal the new MDS daemon
4440 * will wait the client to reconnect it, but the
4441 * client may never register/open the session yet.
4442 *
4443 * Will try to reconnect that MDS daemon if the
4444 * rank number is in the export targets array and
4445 * is the up:reconnect state.
4446 */
4447 newstate = ceph_mdsmap_get_state(newmap, i);
4448 if (!test_bit(i, targets) || newstate != CEPH_MDS_STATE_RECONNECT)
4449 continue;
4450
4451 /*
4452 * The session maybe registered and opened by some
4453 * requests which were choosing random MDSes during
4454 * the mdsc->mutex's unlock/lock gap below in rare
4455 * case. But the related MDS daemon will just queue
4456 * that requests and be still waiting for the client's
4457 * reconnection request in up:reconnect state.
4458 */
4459 s = __ceph_lookup_mds_session(mdsc, i);
4460 if (likely(!s)) {
4461 s = __open_export_target_session(mdsc, i);
4462 if (IS_ERR(s)) {
4463 err = PTR_ERR(s);
4464 pr_err("failed to open export target session, err %d\n",
4465 err);
4466 continue;
4467 }
4468 }
4469 dout("send reconnect to export target mds.%d\n", i);
4470 mutex_unlock(&mdsc->mutex);
4471 send_mds_reconnect(mdsc, s);
4472 ceph_put_mds_session(s);
4473 mutex_lock(&mdsc->mutex);
4474 }
4475
4476 for (i = 0; i < newmap->possible_max_rank && i < mdsc->max_sessions; i++) {
4477 s = mdsc->sessions[i];
4478 if (!s)
4479 continue;
4480 if (!ceph_mdsmap_is_laggy(newmap, i))
4481 continue;
4482 if (s->s_state == CEPH_MDS_SESSION_OPEN ||
4483 s->s_state == CEPH_MDS_SESSION_HUNG ||
4484 s->s_state == CEPH_MDS_SESSION_CLOSING) {
4485 dout(" connecting to export targets of laggy mds%d\n",
4486 i);
4487 __open_export_target_sessions(mdsc, s);
4488 }
4489 }
4490}
4491
4492
4493
4494/*
4495 * leases
4496 */
4497
4498/*
4499 * caller must hold session s_mutex, dentry->d_lock
4500 */
4501void __ceph_mdsc_drop_dentry_lease(struct dentry *dentry)
4502{
4503 struct ceph_dentry_info *di = ceph_dentry(dentry);
4504
4505 ceph_put_mds_session(di->lease_session);
4506 di->lease_session = NULL;
4507}
4508
4509static void handle_lease(struct ceph_mds_client *mdsc,
4510 struct ceph_mds_session *session,
4511 struct ceph_msg *msg)
4512{
4513 struct super_block *sb = mdsc->fsc->sb;
4514 struct inode *inode;
4515 struct dentry *parent, *dentry;
4516 struct ceph_dentry_info *di;
4517 int mds = session->s_mds;
4518 struct ceph_mds_lease *h = msg->front.iov_base;
4519 u32 seq;
4520 struct ceph_vino vino;
4521 struct qstr dname;
4522 int release = 0;
4523
4524 dout("handle_lease from mds%d\n", mds);
4525
4526 /* decode */
4527 if (msg->front.iov_len < sizeof(*h) + sizeof(u32))
4528 goto bad;
4529 vino.ino = le64_to_cpu(h->ino);
4530 vino.snap = CEPH_NOSNAP;
4531 seq = le32_to_cpu(h->seq);
4532 dname.len = get_unaligned_le32(h + 1);
4533 if (msg->front.iov_len < sizeof(*h) + sizeof(u32) + dname.len)
4534 goto bad;
4535 dname.name = (void *)(h + 1) + sizeof(u32);
4536
4537 /* lookup inode */
4538 inode = ceph_find_inode(sb, vino);
4539 dout("handle_lease %s, ino %llx %p %.*s\n",
4540 ceph_lease_op_name(h->action), vino.ino, inode,
4541 dname.len, dname.name);
4542
4543 mutex_lock(&session->s_mutex);
4544 inc_session_sequence(session);
4545
4546 if (!inode) {
4547 dout("handle_lease no inode %llx\n", vino.ino);
4548 goto release;
4549 }
4550
4551 /* dentry */
4552 parent = d_find_alias(inode);
4553 if (!parent) {
4554 dout("no parent dentry on inode %p\n", inode);
4555 WARN_ON(1);
4556 goto release; /* hrm... */
4557 }
4558 dname.hash = full_name_hash(parent, dname.name, dname.len);
4559 dentry = d_lookup(parent, &dname);
4560 dput(parent);
4561 if (!dentry)
4562 goto release;
4563
4564 spin_lock(&dentry->d_lock);
4565 di = ceph_dentry(dentry);
4566 switch (h->action) {
4567 case CEPH_MDS_LEASE_REVOKE:
4568 if (di->lease_session == session) {
4569 if (ceph_seq_cmp(di->lease_seq, seq) > 0)
4570 h->seq = cpu_to_le32(di->lease_seq);
4571 __ceph_mdsc_drop_dentry_lease(dentry);
4572 }
4573 release = 1;
4574 break;
4575
4576 case CEPH_MDS_LEASE_RENEW:
4577 if (di->lease_session == session &&
4578 di->lease_gen == atomic_read(&session->s_cap_gen) &&
4579 di->lease_renew_from &&
4580 di->lease_renew_after == 0) {
4581 unsigned long duration =
4582 msecs_to_jiffies(le32_to_cpu(h->duration_ms));
4583
4584 di->lease_seq = seq;
4585 di->time = di->lease_renew_from + duration;
4586 di->lease_renew_after = di->lease_renew_from +
4587 (duration >> 1);
4588 di->lease_renew_from = 0;
4589 }
4590 break;
4591 }
4592 spin_unlock(&dentry->d_lock);
4593 dput(dentry);
4594
4595 if (!release)
4596 goto out;
4597
4598release:
4599 /* let's just reuse the same message */
4600 h->action = CEPH_MDS_LEASE_REVOKE_ACK;
4601 ceph_msg_get(msg);
4602 ceph_con_send(&session->s_con, msg);
4603
4604out:
4605 mutex_unlock(&session->s_mutex);
4606 iput(inode);
4607 return;
4608
4609bad:
4610 pr_err("corrupt lease message\n");
4611 ceph_msg_dump(msg);
4612}
4613
4614void ceph_mdsc_lease_send_msg(struct ceph_mds_session *session,
4615 struct dentry *dentry, char action,
4616 u32 seq)
4617{
4618 struct ceph_msg *msg;
4619 struct ceph_mds_lease *lease;
4620 struct inode *dir;
4621 int len = sizeof(*lease) + sizeof(u32) + NAME_MAX;
4622
4623 dout("lease_send_msg identry %p %s to mds%d\n",
4624 dentry, ceph_lease_op_name(action), session->s_mds);
4625
4626 msg = ceph_msg_new(CEPH_MSG_CLIENT_LEASE, len, GFP_NOFS, false);
4627 if (!msg)
4628 return;
4629 lease = msg->front.iov_base;
4630 lease->action = action;
4631 lease->seq = cpu_to_le32(seq);
4632
4633 spin_lock(&dentry->d_lock);
4634 dir = d_inode(dentry->d_parent);
4635 lease->ino = cpu_to_le64(ceph_ino(dir));
4636 lease->first = lease->last = cpu_to_le64(ceph_snap(dir));
4637
4638 put_unaligned_le32(dentry->d_name.len, lease + 1);
4639 memcpy((void *)(lease + 1) + 4,
4640 dentry->d_name.name, dentry->d_name.len);
4641 spin_unlock(&dentry->d_lock);
4642
4643 ceph_con_send(&session->s_con, msg);
4644}
4645
4646/*
4647 * lock unlock the session, to wait ongoing session activities
4648 */
4649static void lock_unlock_session(struct ceph_mds_session *s)
4650{
4651 mutex_lock(&s->s_mutex);
4652 mutex_unlock(&s->s_mutex);
4653}
4654
4655static void maybe_recover_session(struct ceph_mds_client *mdsc)
4656{
4657 struct ceph_fs_client *fsc = mdsc->fsc;
4658
4659 if (!ceph_test_mount_opt(fsc, CLEANRECOVER))
4660 return;
4661
4662 if (READ_ONCE(fsc->mount_state) != CEPH_MOUNT_MOUNTED)
4663 return;
4664
4665 if (!READ_ONCE(fsc->blocklisted))
4666 return;
4667
4668 pr_info("auto reconnect after blocklisted\n");
4669 ceph_force_reconnect(fsc->sb);
4670}
4671
4672bool check_session_state(struct ceph_mds_session *s)
4673{
4674 switch (s->s_state) {
4675 case CEPH_MDS_SESSION_OPEN:
4676 if (s->s_ttl && time_after(jiffies, s->s_ttl)) {
4677 s->s_state = CEPH_MDS_SESSION_HUNG;
4678 pr_info("mds%d hung\n", s->s_mds);
4679 }
4680 break;
4681 case CEPH_MDS_SESSION_CLOSING:
4682 case CEPH_MDS_SESSION_NEW:
4683 case CEPH_MDS_SESSION_RESTARTING:
4684 case CEPH_MDS_SESSION_CLOSED:
4685 case CEPH_MDS_SESSION_REJECTED:
4686 return false;
4687 }
4688
4689 return true;
4690}
4691
4692/*
4693 * If the sequence is incremented while we're waiting on a REQUEST_CLOSE reply,
4694 * then we need to retransmit that request.
4695 */
4696void inc_session_sequence(struct ceph_mds_session *s)
4697{
4698 lockdep_assert_held(&s->s_mutex);
4699
4700 s->s_seq++;
4701
4702 if (s->s_state == CEPH_MDS_SESSION_CLOSING) {
4703 int ret;
4704
4705 dout("resending session close request for mds%d\n", s->s_mds);
4706 ret = request_close_session(s);
4707 if (ret < 0)
4708 pr_err("unable to close session to mds%d: %d\n",
4709 s->s_mds, ret);
4710 }
4711}
4712
4713/*
4714 * delayed work -- periodically trim expired leases, renew caps with mds. If
4715 * the @delay parameter is set to 0 or if it's more than 5 secs, the default
4716 * workqueue delay value of 5 secs will be used.
4717 */
4718static void schedule_delayed(struct ceph_mds_client *mdsc, unsigned long delay)
4719{
4720 unsigned long max_delay = HZ * 5;
4721
4722 /* 5 secs default delay */
4723 if (!delay || (delay > max_delay))
4724 delay = max_delay;
4725 schedule_delayed_work(&mdsc->delayed_work,
4726 round_jiffies_relative(delay));
4727}
4728
4729static void delayed_work(struct work_struct *work)
4730{
4731 struct ceph_mds_client *mdsc =
4732 container_of(work, struct ceph_mds_client, delayed_work.work);
4733 unsigned long delay;
4734 int renew_interval;
4735 int renew_caps;
4736 int i;
4737
4738 dout("mdsc delayed_work\n");
4739
4740 if (mdsc->stopping)
4741 return;
4742
4743 mutex_lock(&mdsc->mutex);
4744 renew_interval = mdsc->mdsmap->m_session_timeout >> 2;
4745 renew_caps = time_after_eq(jiffies, HZ*renew_interval +
4746 mdsc->last_renew_caps);
4747 if (renew_caps)
4748 mdsc->last_renew_caps = jiffies;
4749
4750 for (i = 0; i < mdsc->max_sessions; i++) {
4751 struct ceph_mds_session *s = __ceph_lookup_mds_session(mdsc, i);
4752 if (!s)
4753 continue;
4754
4755 if (!check_session_state(s)) {
4756 ceph_put_mds_session(s);
4757 continue;
4758 }
4759 mutex_unlock(&mdsc->mutex);
4760
4761 mutex_lock(&s->s_mutex);
4762 if (renew_caps)
4763 send_renew_caps(mdsc, s);
4764 else
4765 ceph_con_keepalive(&s->s_con);
4766 if (s->s_state == CEPH_MDS_SESSION_OPEN ||
4767 s->s_state == CEPH_MDS_SESSION_HUNG)
4768 ceph_send_cap_releases(mdsc, s);
4769 mutex_unlock(&s->s_mutex);
4770 ceph_put_mds_session(s);
4771
4772 mutex_lock(&mdsc->mutex);
4773 }
4774 mutex_unlock(&mdsc->mutex);
4775
4776 delay = ceph_check_delayed_caps(mdsc);
4777
4778 ceph_queue_cap_reclaim_work(mdsc);
4779
4780 ceph_trim_snapid_map(mdsc);
4781
4782 maybe_recover_session(mdsc);
4783
4784 schedule_delayed(mdsc, delay);
4785}
4786
4787int ceph_mdsc_init(struct ceph_fs_client *fsc)
4788
4789{
4790 struct ceph_mds_client *mdsc;
4791 int err;
4792
4793 mdsc = kzalloc(sizeof(struct ceph_mds_client), GFP_NOFS);
4794 if (!mdsc)
4795 return -ENOMEM;
4796 mdsc->fsc = fsc;
4797 mutex_init(&mdsc->mutex);
4798 mdsc->mdsmap = kzalloc(sizeof(*mdsc->mdsmap), GFP_NOFS);
4799 if (!mdsc->mdsmap) {
4800 err = -ENOMEM;
4801 goto err_mdsc;
4802 }
4803
4804 init_completion(&mdsc->safe_umount_waiters);
4805 init_waitqueue_head(&mdsc->session_close_wq);
4806 INIT_LIST_HEAD(&mdsc->waiting_for_map);
4807 mdsc->quotarealms_inodes = RB_ROOT;
4808 mutex_init(&mdsc->quotarealms_inodes_mutex);
4809 init_rwsem(&mdsc->snap_rwsem);
4810 mdsc->snap_realms = RB_ROOT;
4811 INIT_LIST_HEAD(&mdsc->snap_empty);
4812 spin_lock_init(&mdsc->snap_empty_lock);
4813 mdsc->request_tree = RB_ROOT;
4814 INIT_DELAYED_WORK(&mdsc->delayed_work, delayed_work);
4815 mdsc->last_renew_caps = jiffies;
4816 INIT_LIST_HEAD(&mdsc->cap_delay_list);
4817 INIT_LIST_HEAD(&mdsc->cap_wait_list);
4818 spin_lock_init(&mdsc->cap_delay_lock);
4819 INIT_LIST_HEAD(&mdsc->snap_flush_list);
4820 spin_lock_init(&mdsc->snap_flush_lock);
4821 mdsc->last_cap_flush_tid = 1;
4822 INIT_LIST_HEAD(&mdsc->cap_flush_list);
4823 INIT_LIST_HEAD(&mdsc->cap_dirty_migrating);
4824 spin_lock_init(&mdsc->cap_dirty_lock);
4825 init_waitqueue_head(&mdsc->cap_flushing_wq);
4826 INIT_WORK(&mdsc->cap_reclaim_work, ceph_cap_reclaim_work);
4827 err = ceph_metric_init(&mdsc->metric);
4828 if (err)
4829 goto err_mdsmap;
4830
4831 spin_lock_init(&mdsc->dentry_list_lock);
4832 INIT_LIST_HEAD(&mdsc->dentry_leases);
4833 INIT_LIST_HEAD(&mdsc->dentry_dir_leases);
4834
4835 ceph_caps_init(mdsc);
4836 ceph_adjust_caps_max_min(mdsc, fsc->mount_options);
4837
4838 spin_lock_init(&mdsc->snapid_map_lock);
4839 mdsc->snapid_map_tree = RB_ROOT;
4840 INIT_LIST_HEAD(&mdsc->snapid_map_lru);
4841
4842 init_rwsem(&mdsc->pool_perm_rwsem);
4843 mdsc->pool_perm_tree = RB_ROOT;
4844
4845 strscpy(mdsc->nodename, utsname()->nodename,
4846 sizeof(mdsc->nodename));
4847
4848 fsc->mdsc = mdsc;
4849 return 0;
4850
4851err_mdsmap:
4852 kfree(mdsc->mdsmap);
4853err_mdsc:
4854 kfree(mdsc);
4855 return err;
4856}
4857
4858/*
4859 * Wait for safe replies on open mds requests. If we time out, drop
4860 * all requests from the tree to avoid dangling dentry refs.
4861 */
4862static void wait_requests(struct ceph_mds_client *mdsc)
4863{
4864 struct ceph_options *opts = mdsc->fsc->client->options;
4865 struct ceph_mds_request *req;
4866
4867 mutex_lock(&mdsc->mutex);
4868 if (__get_oldest_req(mdsc)) {
4869 mutex_unlock(&mdsc->mutex);
4870
4871 dout("wait_requests waiting for requests\n");
4872 wait_for_completion_timeout(&mdsc->safe_umount_waiters,
4873 ceph_timeout_jiffies(opts->mount_timeout));
4874
4875 /* tear down remaining requests */
4876 mutex_lock(&mdsc->mutex);
4877 while ((req = __get_oldest_req(mdsc))) {
4878 dout("wait_requests timed out on tid %llu\n",
4879 req->r_tid);
4880 list_del_init(&req->r_wait);
4881 __unregister_request(mdsc, req);
4882 }
4883 }
4884 mutex_unlock(&mdsc->mutex);
4885 dout("wait_requests done\n");
4886}
4887
4888void send_flush_mdlog(struct ceph_mds_session *s)
4889{
4890 struct ceph_msg *msg;
4891
4892 /*
4893 * Pre-luminous MDS crashes when it sees an unknown session request
4894 */
4895 if (!CEPH_HAVE_FEATURE(s->s_con.peer_features, SERVER_LUMINOUS))
4896 return;
4897
4898 mutex_lock(&s->s_mutex);
4899 dout("request mdlog flush to mds%d (%s)s seq %lld\n", s->s_mds,
4900 ceph_session_state_name(s->s_state), s->s_seq);
4901 msg = ceph_create_session_msg(CEPH_SESSION_REQUEST_FLUSH_MDLOG,
4902 s->s_seq);
4903 if (!msg) {
4904 pr_err("failed to request mdlog flush to mds%d (%s) seq %lld\n",
4905 s->s_mds, ceph_session_state_name(s->s_state), s->s_seq);
4906 } else {
4907 ceph_con_send(&s->s_con, msg);
4908 }
4909 mutex_unlock(&s->s_mutex);
4910}
4911
4912/*
4913 * called before mount is ro, and before dentries are torn down.
4914 * (hmm, does this still race with new lookups?)
4915 */
4916void ceph_mdsc_pre_umount(struct ceph_mds_client *mdsc)
4917{
4918 dout("pre_umount\n");
4919 mdsc->stopping = 1;
4920
4921 ceph_mdsc_iterate_sessions(mdsc, send_flush_mdlog, true);
4922 ceph_mdsc_iterate_sessions(mdsc, lock_unlock_session, false);
4923 ceph_flush_dirty_caps(mdsc);
4924 wait_requests(mdsc);
4925
4926 /*
4927 * wait for reply handlers to drop their request refs and
4928 * their inode/dcache refs
4929 */
4930 ceph_msgr_flush();
4931
4932 ceph_cleanup_quotarealms_inodes(mdsc);
4933}
4934
4935/*
4936 * flush the mdlog and wait for all write mds requests to flush.
4937 */
4938static void flush_mdlog_and_wait_mdsc_unsafe_requests(struct ceph_mds_client *mdsc,
4939 u64 want_tid)
4940{
4941 struct ceph_mds_request *req = NULL, *nextreq;
4942 struct ceph_mds_session *last_session = NULL;
4943 struct rb_node *n;
4944
4945 mutex_lock(&mdsc->mutex);
4946 dout("%s want %lld\n", __func__, want_tid);
4947restart:
4948 req = __get_oldest_req(mdsc);
4949 while (req && req->r_tid <= want_tid) {
4950 /* find next request */
4951 n = rb_next(&req->r_node);
4952 if (n)
4953 nextreq = rb_entry(n, struct ceph_mds_request, r_node);
4954 else
4955 nextreq = NULL;
4956 if (req->r_op != CEPH_MDS_OP_SETFILELOCK &&
4957 (req->r_op & CEPH_MDS_OP_WRITE)) {
4958 struct ceph_mds_session *s = req->r_session;
4959
4960 if (!s) {
4961 req = nextreq;
4962 continue;
4963 }
4964
4965 /* write op */
4966 ceph_mdsc_get_request(req);
4967 if (nextreq)
4968 ceph_mdsc_get_request(nextreq);
4969 s = ceph_get_mds_session(s);
4970 mutex_unlock(&mdsc->mutex);
4971
4972 /* send flush mdlog request to MDS */
4973 if (last_session != s) {
4974 send_flush_mdlog(s);
4975 ceph_put_mds_session(last_session);
4976 last_session = s;
4977 } else {
4978 ceph_put_mds_session(s);
4979 }
4980 dout("%s wait on %llu (want %llu)\n", __func__,
4981 req->r_tid, want_tid);
4982 wait_for_completion(&req->r_safe_completion);
4983
4984 mutex_lock(&mdsc->mutex);
4985 ceph_mdsc_put_request(req);
4986 if (!nextreq)
4987 break; /* next dne before, so we're done! */
4988 if (RB_EMPTY_NODE(&nextreq->r_node)) {
4989 /* next request was removed from tree */
4990 ceph_mdsc_put_request(nextreq);
4991 goto restart;
4992 }
4993 ceph_mdsc_put_request(nextreq); /* won't go away */
4994 }
4995 req = nextreq;
4996 }
4997 mutex_unlock(&mdsc->mutex);
4998 ceph_put_mds_session(last_session);
4999 dout("%s done\n", __func__);
5000}
5001
5002void ceph_mdsc_sync(struct ceph_mds_client *mdsc)
5003{
5004 u64 want_tid, want_flush;
5005
5006 if (READ_ONCE(mdsc->fsc->mount_state) >= CEPH_MOUNT_SHUTDOWN)
5007 return;
5008
5009 dout("sync\n");
5010 mutex_lock(&mdsc->mutex);
5011 want_tid = mdsc->last_tid;
5012 mutex_unlock(&mdsc->mutex);
5013
5014 ceph_flush_dirty_caps(mdsc);
5015 spin_lock(&mdsc->cap_dirty_lock);
5016 want_flush = mdsc->last_cap_flush_tid;
5017 if (!list_empty(&mdsc->cap_flush_list)) {
5018 struct ceph_cap_flush *cf =
5019 list_last_entry(&mdsc->cap_flush_list,
5020 struct ceph_cap_flush, g_list);
5021 cf->wake = true;
5022 }
5023 spin_unlock(&mdsc->cap_dirty_lock);
5024
5025 dout("sync want tid %lld flush_seq %lld\n",
5026 want_tid, want_flush);
5027
5028 flush_mdlog_and_wait_mdsc_unsafe_requests(mdsc, want_tid);
5029 wait_caps_flush(mdsc, want_flush);
5030}
5031
5032/*
5033 * true if all sessions are closed, or we force unmount
5034 */
5035static bool done_closing_sessions(struct ceph_mds_client *mdsc, int skipped)
5036{
5037 if (READ_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_SHUTDOWN)
5038 return true;
5039 return atomic_read(&mdsc->num_sessions) <= skipped;
5040}
5041
5042/*
5043 * called after sb is ro or when metadata corrupted.
5044 */
5045void ceph_mdsc_close_sessions(struct ceph_mds_client *mdsc)
5046{
5047 struct ceph_options *opts = mdsc->fsc->client->options;
5048 struct ceph_mds_session *session;
5049 int i;
5050 int skipped = 0;
5051
5052 dout("close_sessions\n");
5053
5054 /* close sessions */
5055 mutex_lock(&mdsc->mutex);
5056 for (i = 0; i < mdsc->max_sessions; i++) {
5057 session = __ceph_lookup_mds_session(mdsc, i);
5058 if (!session)
5059 continue;
5060 mutex_unlock(&mdsc->mutex);
5061 mutex_lock(&session->s_mutex);
5062 if (__close_session(mdsc, session) <= 0)
5063 skipped++;
5064 mutex_unlock(&session->s_mutex);
5065 ceph_put_mds_session(session);
5066 mutex_lock(&mdsc->mutex);
5067 }
5068 mutex_unlock(&mdsc->mutex);
5069
5070 dout("waiting for sessions to close\n");
5071 wait_event_timeout(mdsc->session_close_wq,
5072 done_closing_sessions(mdsc, skipped),
5073 ceph_timeout_jiffies(opts->mount_timeout));
5074
5075 /* tear down remaining sessions */
5076 mutex_lock(&mdsc->mutex);
5077 for (i = 0; i < mdsc->max_sessions; i++) {
5078 if (mdsc->sessions[i]) {
5079 session = ceph_get_mds_session(mdsc->sessions[i]);
5080 __unregister_session(mdsc, session);
5081 mutex_unlock(&mdsc->mutex);
5082 mutex_lock(&session->s_mutex);
5083 remove_session_caps(session);
5084 mutex_unlock(&session->s_mutex);
5085 ceph_put_mds_session(session);
5086 mutex_lock(&mdsc->mutex);
5087 }
5088 }
5089 WARN_ON(!list_empty(&mdsc->cap_delay_list));
5090 mutex_unlock(&mdsc->mutex);
5091
5092 ceph_cleanup_snapid_map(mdsc);
5093 ceph_cleanup_global_and_empty_realms(mdsc);
5094
5095 cancel_work_sync(&mdsc->cap_reclaim_work);
5096 cancel_delayed_work_sync(&mdsc->delayed_work); /* cancel timer */
5097
5098 dout("stopped\n");
5099}
5100
5101void ceph_mdsc_force_umount(struct ceph_mds_client *mdsc)
5102{
5103 struct ceph_mds_session *session;
5104 int mds;
5105
5106 dout("force umount\n");
5107
5108 mutex_lock(&mdsc->mutex);
5109 for (mds = 0; mds < mdsc->max_sessions; mds++) {
5110 session = __ceph_lookup_mds_session(mdsc, mds);
5111 if (!session)
5112 continue;
5113
5114 if (session->s_state == CEPH_MDS_SESSION_REJECTED)
5115 __unregister_session(mdsc, session);
5116 __wake_requests(mdsc, &session->s_waiting);
5117 mutex_unlock(&mdsc->mutex);
5118
5119 mutex_lock(&session->s_mutex);
5120 __close_session(mdsc, session);
5121 if (session->s_state == CEPH_MDS_SESSION_CLOSING) {
5122 cleanup_session_requests(mdsc, session);
5123 remove_session_caps(session);
5124 }
5125 mutex_unlock(&session->s_mutex);
5126 ceph_put_mds_session(session);
5127
5128 mutex_lock(&mdsc->mutex);
5129 kick_requests(mdsc, mds);
5130 }
5131 __wake_requests(mdsc, &mdsc->waiting_for_map);
5132 mutex_unlock(&mdsc->mutex);
5133}
5134
5135static void ceph_mdsc_stop(struct ceph_mds_client *mdsc)
5136{
5137 dout("stop\n");
5138 /*
5139 * Make sure the delayed work stopped before releasing
5140 * the resources.
5141 *
5142 * Because the cancel_delayed_work_sync() will only
5143 * guarantee that the work finishes executing. But the
5144 * delayed work will re-arm itself again after that.
5145 */
5146 flush_delayed_work(&mdsc->delayed_work);
5147
5148 if (mdsc->mdsmap)
5149 ceph_mdsmap_destroy(mdsc->mdsmap);
5150 kfree(mdsc->sessions);
5151 ceph_caps_finalize(mdsc);
5152 ceph_pool_perm_destroy(mdsc);
5153}
5154
5155void ceph_mdsc_destroy(struct ceph_fs_client *fsc)
5156{
5157 struct ceph_mds_client *mdsc = fsc->mdsc;
5158 dout("mdsc_destroy %p\n", mdsc);
5159
5160 if (!mdsc)
5161 return;
5162
5163 /* flush out any connection work with references to us */
5164 ceph_msgr_flush();
5165
5166 ceph_mdsc_stop(mdsc);
5167
5168 ceph_metric_destroy(&mdsc->metric);
5169
5170 fsc->mdsc = NULL;
5171 kfree(mdsc);
5172 dout("mdsc_destroy %p done\n", mdsc);
5173}
5174
5175void ceph_mdsc_handle_fsmap(struct ceph_mds_client *mdsc, struct ceph_msg *msg)
5176{
5177 struct ceph_fs_client *fsc = mdsc->fsc;
5178 const char *mds_namespace = fsc->mount_options->mds_namespace;
5179 void *p = msg->front.iov_base;
5180 void *end = p + msg->front.iov_len;
5181 u32 epoch;
5182 u32 num_fs;
5183 u32 mount_fscid = (u32)-1;
5184 int err = -EINVAL;
5185
5186 ceph_decode_need(&p, end, sizeof(u32), bad);
5187 epoch = ceph_decode_32(&p);
5188
5189 dout("handle_fsmap epoch %u\n", epoch);
5190
5191 /* struct_v, struct_cv, map_len, epoch, legacy_client_fscid */
5192 ceph_decode_skip_n(&p, end, 2 + sizeof(u32) * 3, bad);
5193
5194 ceph_decode_32_safe(&p, end, num_fs, bad);
5195 while (num_fs-- > 0) {
5196 void *info_p, *info_end;
5197 u32 info_len;
5198 u32 fscid, namelen;
5199
5200 ceph_decode_need(&p, end, 2 + sizeof(u32), bad);
5201 p += 2; // info_v, info_cv
5202 info_len = ceph_decode_32(&p);
5203 ceph_decode_need(&p, end, info_len, bad);
5204 info_p = p;
5205 info_end = p + info_len;
5206 p = info_end;
5207
5208 ceph_decode_need(&info_p, info_end, sizeof(u32) * 2, bad);
5209 fscid = ceph_decode_32(&info_p);
5210 namelen = ceph_decode_32(&info_p);
5211 ceph_decode_need(&info_p, info_end, namelen, bad);
5212
5213 if (mds_namespace &&
5214 strlen(mds_namespace) == namelen &&
5215 !strncmp(mds_namespace, (char *)info_p, namelen)) {
5216 mount_fscid = fscid;
5217 break;
5218 }
5219 }
5220
5221 ceph_monc_got_map(&fsc->client->monc, CEPH_SUB_FSMAP, epoch);
5222 if (mount_fscid != (u32)-1) {
5223 fsc->client->monc.fs_cluster_id = mount_fscid;
5224 ceph_monc_want_map(&fsc->client->monc, CEPH_SUB_MDSMAP,
5225 0, true);
5226 ceph_monc_renew_subs(&fsc->client->monc);
5227 } else {
5228 err = -ENOENT;
5229 goto err_out;
5230 }
5231 return;
5232
5233bad:
5234 pr_err("error decoding fsmap %d. Shutting down mount.\n", err);
5235 ceph_umount_begin(mdsc->fsc->sb);
5236err_out:
5237 mutex_lock(&mdsc->mutex);
5238 mdsc->mdsmap_err = err;
5239 __wake_requests(mdsc, &mdsc->waiting_for_map);
5240 mutex_unlock(&mdsc->mutex);
5241}
5242
5243/*
5244 * handle mds map update.
5245 */
5246void ceph_mdsc_handle_mdsmap(struct ceph_mds_client *mdsc, struct ceph_msg *msg)
5247{
5248 u32 epoch;
5249 u32 maplen;
5250 void *p = msg->front.iov_base;
5251 void *end = p + msg->front.iov_len;
5252 struct ceph_mdsmap *newmap, *oldmap;
5253 struct ceph_fsid fsid;
5254 int err = -EINVAL;
5255
5256 ceph_decode_need(&p, end, sizeof(fsid)+2*sizeof(u32), bad);
5257 ceph_decode_copy(&p, &fsid, sizeof(fsid));
5258 if (ceph_check_fsid(mdsc->fsc->client, &fsid) < 0)
5259 return;
5260 epoch = ceph_decode_32(&p);
5261 maplen = ceph_decode_32(&p);
5262 dout("handle_map epoch %u len %d\n", epoch, (int)maplen);
5263
5264 /* do we need it? */
5265 mutex_lock(&mdsc->mutex);
5266 if (mdsc->mdsmap && epoch <= mdsc->mdsmap->m_epoch) {
5267 dout("handle_map epoch %u <= our %u\n",
5268 epoch, mdsc->mdsmap->m_epoch);
5269 mutex_unlock(&mdsc->mutex);
5270 return;
5271 }
5272
5273 newmap = ceph_mdsmap_decode(&p, end, ceph_msgr2(mdsc->fsc->client));
5274 if (IS_ERR(newmap)) {
5275 err = PTR_ERR(newmap);
5276 goto bad_unlock;
5277 }
5278
5279 /* swap into place */
5280 if (mdsc->mdsmap) {
5281 oldmap = mdsc->mdsmap;
5282 mdsc->mdsmap = newmap;
5283 check_new_map(mdsc, newmap, oldmap);
5284 ceph_mdsmap_destroy(oldmap);
5285 } else {
5286 mdsc->mdsmap = newmap; /* first mds map */
5287 }
5288 mdsc->fsc->max_file_size = min((loff_t)mdsc->mdsmap->m_max_file_size,
5289 MAX_LFS_FILESIZE);
5290
5291 __wake_requests(mdsc, &mdsc->waiting_for_map);
5292 ceph_monc_got_map(&mdsc->fsc->client->monc, CEPH_SUB_MDSMAP,
5293 mdsc->mdsmap->m_epoch);
5294
5295 mutex_unlock(&mdsc->mutex);
5296 schedule_delayed(mdsc, 0);
5297 return;
5298
5299bad_unlock:
5300 mutex_unlock(&mdsc->mutex);
5301bad:
5302 pr_err("error decoding mdsmap %d. Shutting down mount.\n", err);
5303 ceph_umount_begin(mdsc->fsc->sb);
5304 return;
5305}
5306
5307static struct ceph_connection *mds_get_con(struct ceph_connection *con)
5308{
5309 struct ceph_mds_session *s = con->private;
5310
5311 if (ceph_get_mds_session(s))
5312 return con;
5313 return NULL;
5314}
5315
5316static void mds_put_con(struct ceph_connection *con)
5317{
5318 struct ceph_mds_session *s = con->private;
5319
5320 ceph_put_mds_session(s);
5321}
5322
5323/*
5324 * if the client is unresponsive for long enough, the mds will kill
5325 * the session entirely.
5326 */
5327static void mds_peer_reset(struct ceph_connection *con)
5328{
5329 struct ceph_mds_session *s = con->private;
5330 struct ceph_mds_client *mdsc = s->s_mdsc;
5331
5332 pr_warn("mds%d closed our session\n", s->s_mds);
5333 if (READ_ONCE(mdsc->fsc->mount_state) != CEPH_MOUNT_FENCE_IO)
5334 send_mds_reconnect(mdsc, s);
5335}
5336
5337static void mds_dispatch(struct ceph_connection *con, struct ceph_msg *msg)
5338{
5339 struct ceph_mds_session *s = con->private;
5340 struct ceph_mds_client *mdsc = s->s_mdsc;
5341 int type = le16_to_cpu(msg->hdr.type);
5342
5343 mutex_lock(&mdsc->mutex);
5344 if (__verify_registered_session(mdsc, s) < 0) {
5345 mutex_unlock(&mdsc->mutex);
5346 goto out;
5347 }
5348 mutex_unlock(&mdsc->mutex);
5349
5350 switch (type) {
5351 case CEPH_MSG_MDS_MAP:
5352 ceph_mdsc_handle_mdsmap(mdsc, msg);
5353 break;
5354 case CEPH_MSG_FS_MAP_USER:
5355 ceph_mdsc_handle_fsmap(mdsc, msg);
5356 break;
5357 case CEPH_MSG_CLIENT_SESSION:
5358 handle_session(s, msg);
5359 break;
5360 case CEPH_MSG_CLIENT_REPLY:
5361 handle_reply(s, msg);
5362 break;
5363 case CEPH_MSG_CLIENT_REQUEST_FORWARD:
5364 handle_forward(mdsc, s, msg);
5365 break;
5366 case CEPH_MSG_CLIENT_CAPS:
5367 ceph_handle_caps(s, msg);
5368 break;
5369 case CEPH_MSG_CLIENT_SNAP:
5370 ceph_handle_snap(mdsc, s, msg);
5371 break;
5372 case CEPH_MSG_CLIENT_LEASE:
5373 handle_lease(mdsc, s, msg);
5374 break;
5375 case CEPH_MSG_CLIENT_QUOTA:
5376 ceph_handle_quota(mdsc, s, msg);
5377 break;
5378
5379 default:
5380 pr_err("received unknown message type %d %s\n", type,
5381 ceph_msg_type_name(type));
5382 }
5383out:
5384 ceph_msg_put(msg);
5385}
5386
5387/*
5388 * authentication
5389 */
5390
5391/*
5392 * Note: returned pointer is the address of a structure that's
5393 * managed separately. Caller must *not* attempt to free it.
5394 */
5395static struct ceph_auth_handshake *
5396mds_get_authorizer(struct ceph_connection *con, int *proto, int force_new)
5397{
5398 struct ceph_mds_session *s = con->private;
5399 struct ceph_mds_client *mdsc = s->s_mdsc;
5400 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
5401 struct ceph_auth_handshake *auth = &s->s_auth;
5402 int ret;
5403
5404 ret = __ceph_auth_get_authorizer(ac, auth, CEPH_ENTITY_TYPE_MDS,
5405 force_new, proto, NULL, NULL);
5406 if (ret)
5407 return ERR_PTR(ret);
5408
5409 return auth;
5410}
5411
5412static int mds_add_authorizer_challenge(struct ceph_connection *con,
5413 void *challenge_buf, int challenge_buf_len)
5414{
5415 struct ceph_mds_session *s = con->private;
5416 struct ceph_mds_client *mdsc = s->s_mdsc;
5417 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
5418
5419 return ceph_auth_add_authorizer_challenge(ac, s->s_auth.authorizer,
5420 challenge_buf, challenge_buf_len);
5421}
5422
5423static int mds_verify_authorizer_reply(struct ceph_connection *con)
5424{
5425 struct ceph_mds_session *s = con->private;
5426 struct ceph_mds_client *mdsc = s->s_mdsc;
5427 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
5428 struct ceph_auth_handshake *auth = &s->s_auth;
5429
5430 return ceph_auth_verify_authorizer_reply(ac, auth->authorizer,
5431 auth->authorizer_reply_buf, auth->authorizer_reply_buf_len,
5432 NULL, NULL, NULL, NULL);
5433}
5434
5435static int mds_invalidate_authorizer(struct ceph_connection *con)
5436{
5437 struct ceph_mds_session *s = con->private;
5438 struct ceph_mds_client *mdsc = s->s_mdsc;
5439 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
5440
5441 ceph_auth_invalidate_authorizer(ac, CEPH_ENTITY_TYPE_MDS);
5442
5443 return ceph_monc_validate_auth(&mdsc->fsc->client->monc);
5444}
5445
5446static int mds_get_auth_request(struct ceph_connection *con,
5447 void *buf, int *buf_len,
5448 void **authorizer, int *authorizer_len)
5449{
5450 struct ceph_mds_session *s = con->private;
5451 struct ceph_auth_client *ac = s->s_mdsc->fsc->client->monc.auth;
5452 struct ceph_auth_handshake *auth = &s->s_auth;
5453 int ret;
5454
5455 ret = ceph_auth_get_authorizer(ac, auth, CEPH_ENTITY_TYPE_MDS,
5456 buf, buf_len);
5457 if (ret)
5458 return ret;
5459
5460 *authorizer = auth->authorizer_buf;
5461 *authorizer_len = auth->authorizer_buf_len;
5462 return 0;
5463}
5464
5465static int mds_handle_auth_reply_more(struct ceph_connection *con,
5466 void *reply, int reply_len,
5467 void *buf, int *buf_len,
5468 void **authorizer, int *authorizer_len)
5469{
5470 struct ceph_mds_session *s = con->private;
5471 struct ceph_auth_client *ac = s->s_mdsc->fsc->client->monc.auth;
5472 struct ceph_auth_handshake *auth = &s->s_auth;
5473 int ret;
5474
5475 ret = ceph_auth_handle_svc_reply_more(ac, auth, reply, reply_len,
5476 buf, buf_len);
5477 if (ret)
5478 return ret;
5479
5480 *authorizer = auth->authorizer_buf;
5481 *authorizer_len = auth->authorizer_buf_len;
5482 return 0;
5483}
5484
5485static int mds_handle_auth_done(struct ceph_connection *con,
5486 u64 global_id, void *reply, int reply_len,
5487 u8 *session_key, int *session_key_len,
5488 u8 *con_secret, int *con_secret_len)
5489{
5490 struct ceph_mds_session *s = con->private;
5491 struct ceph_auth_client *ac = s->s_mdsc->fsc->client->monc.auth;
5492 struct ceph_auth_handshake *auth = &s->s_auth;
5493
5494 return ceph_auth_handle_svc_reply_done(ac, auth, reply, reply_len,
5495 session_key, session_key_len,
5496 con_secret, con_secret_len);
5497}
5498
5499static int mds_handle_auth_bad_method(struct ceph_connection *con,
5500 int used_proto, int result,
5501 const int *allowed_protos, int proto_cnt,
5502 const int *allowed_modes, int mode_cnt)
5503{
5504 struct ceph_mds_session *s = con->private;
5505 struct ceph_mon_client *monc = &s->s_mdsc->fsc->client->monc;
5506 int ret;
5507
5508 if (ceph_auth_handle_bad_authorizer(monc->auth, CEPH_ENTITY_TYPE_MDS,
5509 used_proto, result,
5510 allowed_protos, proto_cnt,
5511 allowed_modes, mode_cnt)) {
5512 ret = ceph_monc_validate_auth(monc);
5513 if (ret)
5514 return ret;
5515 }
5516
5517 return -EACCES;
5518}
5519
5520static struct ceph_msg *mds_alloc_msg(struct ceph_connection *con,
5521 struct ceph_msg_header *hdr, int *skip)
5522{
5523 struct ceph_msg *msg;
5524 int type = (int) le16_to_cpu(hdr->type);
5525 int front_len = (int) le32_to_cpu(hdr->front_len);
5526
5527 if (con->in_msg)
5528 return con->in_msg;
5529
5530 *skip = 0;
5531 msg = ceph_msg_new(type, front_len, GFP_NOFS, false);
5532 if (!msg) {
5533 pr_err("unable to allocate msg type %d len %d\n",
5534 type, front_len);
5535 return NULL;
5536 }
5537
5538 return msg;
5539}
5540
5541static int mds_sign_message(struct ceph_msg *msg)
5542{
5543 struct ceph_mds_session *s = msg->con->private;
5544 struct ceph_auth_handshake *auth = &s->s_auth;
5545
5546 return ceph_auth_sign_message(auth, msg);
5547}
5548
5549static int mds_check_message_signature(struct ceph_msg *msg)
5550{
5551 struct ceph_mds_session *s = msg->con->private;
5552 struct ceph_auth_handshake *auth = &s->s_auth;
5553
5554 return ceph_auth_check_message_signature(auth, msg);
5555}
5556
5557static const struct ceph_connection_operations mds_con_ops = {
5558 .get = mds_get_con,
5559 .put = mds_put_con,
5560 .alloc_msg = mds_alloc_msg,
5561 .dispatch = mds_dispatch,
5562 .peer_reset = mds_peer_reset,
5563 .get_authorizer = mds_get_authorizer,
5564 .add_authorizer_challenge = mds_add_authorizer_challenge,
5565 .verify_authorizer_reply = mds_verify_authorizer_reply,
5566 .invalidate_authorizer = mds_invalidate_authorizer,
5567 .sign_message = mds_sign_message,
5568 .check_message_signature = mds_check_message_signature,
5569 .get_auth_request = mds_get_auth_request,
5570 .handle_auth_reply_more = mds_handle_auth_reply_more,
5571 .handle_auth_done = mds_handle_auth_done,
5572 .handle_auth_bad_method = mds_handle_auth_bad_method,
5573};
5574
5575/* eof */
1#include <linux/ceph/ceph_debug.h>
2
3#include <linux/fs.h>
4#include <linux/wait.h>
5#include <linux/slab.h>
6#include <linux/sched.h>
7#include <linux/debugfs.h>
8#include <linux/seq_file.h>
9
10#include "super.h"
11#include "mds_client.h"
12
13#include <linux/ceph/messenger.h>
14#include <linux/ceph/decode.h>
15#include <linux/ceph/pagelist.h>
16#include <linux/ceph/auth.h>
17#include <linux/ceph/debugfs.h>
18
19/*
20 * A cluster of MDS (metadata server) daemons is responsible for
21 * managing the file system namespace (the directory hierarchy and
22 * inodes) and for coordinating shared access to storage. Metadata is
23 * partitioning hierarchically across a number of servers, and that
24 * partition varies over time as the cluster adjusts the distribution
25 * in order to balance load.
26 *
27 * The MDS client is primarily responsible to managing synchronous
28 * metadata requests for operations like open, unlink, and so forth.
29 * If there is a MDS failure, we find out about it when we (possibly
30 * request and) receive a new MDS map, and can resubmit affected
31 * requests.
32 *
33 * For the most part, though, we take advantage of a lossless
34 * communications channel to the MDS, and do not need to worry about
35 * timing out or resubmitting requests.
36 *
37 * We maintain a stateful "session" with each MDS we interact with.
38 * Within each session, we sent periodic heartbeat messages to ensure
39 * any capabilities or leases we have been issues remain valid. If
40 * the session times out and goes stale, our leases and capabilities
41 * are no longer valid.
42 */
43
44struct ceph_reconnect_state {
45 struct ceph_pagelist *pagelist;
46 bool flock;
47};
48
49static void __wake_requests(struct ceph_mds_client *mdsc,
50 struct list_head *head);
51
52static const struct ceph_connection_operations mds_con_ops;
53
54
55/*
56 * mds reply parsing
57 */
58
59/*
60 * parse individual inode info
61 */
62static int parse_reply_info_in(void **p, void *end,
63 struct ceph_mds_reply_info_in *info,
64 int features)
65{
66 int err = -EIO;
67
68 info->in = *p;
69 *p += sizeof(struct ceph_mds_reply_inode) +
70 sizeof(*info->in->fragtree.splits) *
71 le32_to_cpu(info->in->fragtree.nsplits);
72
73 ceph_decode_32_safe(p, end, info->symlink_len, bad);
74 ceph_decode_need(p, end, info->symlink_len, bad);
75 info->symlink = *p;
76 *p += info->symlink_len;
77
78 if (features & CEPH_FEATURE_DIRLAYOUTHASH)
79 ceph_decode_copy_safe(p, end, &info->dir_layout,
80 sizeof(info->dir_layout), bad);
81 else
82 memset(&info->dir_layout, 0, sizeof(info->dir_layout));
83
84 ceph_decode_32_safe(p, end, info->xattr_len, bad);
85 ceph_decode_need(p, end, info->xattr_len, bad);
86 info->xattr_data = *p;
87 *p += info->xattr_len;
88 return 0;
89bad:
90 return err;
91}
92
93/*
94 * parse a normal reply, which may contain a (dir+)dentry and/or a
95 * target inode.
96 */
97static int parse_reply_info_trace(void **p, void *end,
98 struct ceph_mds_reply_info_parsed *info,
99 int features)
100{
101 int err;
102
103 if (info->head->is_dentry) {
104 err = parse_reply_info_in(p, end, &info->diri, features);
105 if (err < 0)
106 goto out_bad;
107
108 if (unlikely(*p + sizeof(*info->dirfrag) > end))
109 goto bad;
110 info->dirfrag = *p;
111 *p += sizeof(*info->dirfrag) +
112 sizeof(u32)*le32_to_cpu(info->dirfrag->ndist);
113 if (unlikely(*p > end))
114 goto bad;
115
116 ceph_decode_32_safe(p, end, info->dname_len, bad);
117 ceph_decode_need(p, end, info->dname_len, bad);
118 info->dname = *p;
119 *p += info->dname_len;
120 info->dlease = *p;
121 *p += sizeof(*info->dlease);
122 }
123
124 if (info->head->is_target) {
125 err = parse_reply_info_in(p, end, &info->targeti, features);
126 if (err < 0)
127 goto out_bad;
128 }
129
130 if (unlikely(*p != end))
131 goto bad;
132 return 0;
133
134bad:
135 err = -EIO;
136out_bad:
137 pr_err("problem parsing mds trace %d\n", err);
138 return err;
139}
140
141/*
142 * parse readdir results
143 */
144static int parse_reply_info_dir(void **p, void *end,
145 struct ceph_mds_reply_info_parsed *info,
146 int features)
147{
148 u32 num, i = 0;
149 int err;
150
151 info->dir_dir = *p;
152 if (*p + sizeof(*info->dir_dir) > end)
153 goto bad;
154 *p += sizeof(*info->dir_dir) +
155 sizeof(u32)*le32_to_cpu(info->dir_dir->ndist);
156 if (*p > end)
157 goto bad;
158
159 ceph_decode_need(p, end, sizeof(num) + 2, bad);
160 num = ceph_decode_32(p);
161 info->dir_end = ceph_decode_8(p);
162 info->dir_complete = ceph_decode_8(p);
163 if (num == 0)
164 goto done;
165
166 /* alloc large array */
167 info->dir_nr = num;
168 info->dir_in = kcalloc(num, sizeof(*info->dir_in) +
169 sizeof(*info->dir_dname) +
170 sizeof(*info->dir_dname_len) +
171 sizeof(*info->dir_dlease),
172 GFP_NOFS);
173 if (info->dir_in == NULL) {
174 err = -ENOMEM;
175 goto out_bad;
176 }
177 info->dir_dname = (void *)(info->dir_in + num);
178 info->dir_dname_len = (void *)(info->dir_dname + num);
179 info->dir_dlease = (void *)(info->dir_dname_len + num);
180
181 while (num) {
182 /* dentry */
183 ceph_decode_need(p, end, sizeof(u32)*2, bad);
184 info->dir_dname_len[i] = ceph_decode_32(p);
185 ceph_decode_need(p, end, info->dir_dname_len[i], bad);
186 info->dir_dname[i] = *p;
187 *p += info->dir_dname_len[i];
188 dout("parsed dir dname '%.*s'\n", info->dir_dname_len[i],
189 info->dir_dname[i]);
190 info->dir_dlease[i] = *p;
191 *p += sizeof(struct ceph_mds_reply_lease);
192
193 /* inode */
194 err = parse_reply_info_in(p, end, &info->dir_in[i], features);
195 if (err < 0)
196 goto out_bad;
197 i++;
198 num--;
199 }
200
201done:
202 if (*p != end)
203 goto bad;
204 return 0;
205
206bad:
207 err = -EIO;
208out_bad:
209 pr_err("problem parsing dir contents %d\n", err);
210 return err;
211}
212
213/*
214 * parse fcntl F_GETLK results
215 */
216static int parse_reply_info_filelock(void **p, void *end,
217 struct ceph_mds_reply_info_parsed *info,
218 int features)
219{
220 if (*p + sizeof(*info->filelock_reply) > end)
221 goto bad;
222
223 info->filelock_reply = *p;
224 *p += sizeof(*info->filelock_reply);
225
226 if (unlikely(*p != end))
227 goto bad;
228 return 0;
229
230bad:
231 return -EIO;
232}
233
234/*
235 * parse extra results
236 */
237static int parse_reply_info_extra(void **p, void *end,
238 struct ceph_mds_reply_info_parsed *info,
239 int features)
240{
241 if (info->head->op == CEPH_MDS_OP_GETFILELOCK)
242 return parse_reply_info_filelock(p, end, info, features);
243 else
244 return parse_reply_info_dir(p, end, info, features);
245}
246
247/*
248 * parse entire mds reply
249 */
250static int parse_reply_info(struct ceph_msg *msg,
251 struct ceph_mds_reply_info_parsed *info,
252 int features)
253{
254 void *p, *end;
255 u32 len;
256 int err;
257
258 info->head = msg->front.iov_base;
259 p = msg->front.iov_base + sizeof(struct ceph_mds_reply_head);
260 end = p + msg->front.iov_len - sizeof(struct ceph_mds_reply_head);
261
262 /* trace */
263 ceph_decode_32_safe(&p, end, len, bad);
264 if (len > 0) {
265 err = parse_reply_info_trace(&p, p+len, info, features);
266 if (err < 0)
267 goto out_bad;
268 }
269
270 /* extra */
271 ceph_decode_32_safe(&p, end, len, bad);
272 if (len > 0) {
273 err = parse_reply_info_extra(&p, p+len, info, features);
274 if (err < 0)
275 goto out_bad;
276 }
277
278 /* snap blob */
279 ceph_decode_32_safe(&p, end, len, bad);
280 info->snapblob_len = len;
281 info->snapblob = p;
282 p += len;
283
284 if (p != end)
285 goto bad;
286 return 0;
287
288bad:
289 err = -EIO;
290out_bad:
291 pr_err("mds parse_reply err %d\n", err);
292 return err;
293}
294
295static void destroy_reply_info(struct ceph_mds_reply_info_parsed *info)
296{
297 kfree(info->dir_in);
298}
299
300
301/*
302 * sessions
303 */
304static const char *session_state_name(int s)
305{
306 switch (s) {
307 case CEPH_MDS_SESSION_NEW: return "new";
308 case CEPH_MDS_SESSION_OPENING: return "opening";
309 case CEPH_MDS_SESSION_OPEN: return "open";
310 case CEPH_MDS_SESSION_HUNG: return "hung";
311 case CEPH_MDS_SESSION_CLOSING: return "closing";
312 case CEPH_MDS_SESSION_RESTARTING: return "restarting";
313 case CEPH_MDS_SESSION_RECONNECTING: return "reconnecting";
314 default: return "???";
315 }
316}
317
318static struct ceph_mds_session *get_session(struct ceph_mds_session *s)
319{
320 if (atomic_inc_not_zero(&s->s_ref)) {
321 dout("mdsc get_session %p %d -> %d\n", s,
322 atomic_read(&s->s_ref)-1, atomic_read(&s->s_ref));
323 return s;
324 } else {
325 dout("mdsc get_session %p 0 -- FAIL", s);
326 return NULL;
327 }
328}
329
330void ceph_put_mds_session(struct ceph_mds_session *s)
331{
332 dout("mdsc put_session %p %d -> %d\n", s,
333 atomic_read(&s->s_ref), atomic_read(&s->s_ref)-1);
334 if (atomic_dec_and_test(&s->s_ref)) {
335 if (s->s_authorizer)
336 s->s_mdsc->fsc->client->monc.auth->ops->destroy_authorizer(
337 s->s_mdsc->fsc->client->monc.auth,
338 s->s_authorizer);
339 kfree(s);
340 }
341}
342
343/*
344 * called under mdsc->mutex
345 */
346struct ceph_mds_session *__ceph_lookup_mds_session(struct ceph_mds_client *mdsc,
347 int mds)
348{
349 struct ceph_mds_session *session;
350
351 if (mds >= mdsc->max_sessions || mdsc->sessions[mds] == NULL)
352 return NULL;
353 session = mdsc->sessions[mds];
354 dout("lookup_mds_session %p %d\n", session,
355 atomic_read(&session->s_ref));
356 get_session(session);
357 return session;
358}
359
360static bool __have_session(struct ceph_mds_client *mdsc, int mds)
361{
362 if (mds >= mdsc->max_sessions)
363 return false;
364 return mdsc->sessions[mds];
365}
366
367static int __verify_registered_session(struct ceph_mds_client *mdsc,
368 struct ceph_mds_session *s)
369{
370 if (s->s_mds >= mdsc->max_sessions ||
371 mdsc->sessions[s->s_mds] != s)
372 return -ENOENT;
373 return 0;
374}
375
376/*
377 * create+register a new session for given mds.
378 * called under mdsc->mutex.
379 */
380static struct ceph_mds_session *register_session(struct ceph_mds_client *mdsc,
381 int mds)
382{
383 struct ceph_mds_session *s;
384
385 s = kzalloc(sizeof(*s), GFP_NOFS);
386 if (!s)
387 return ERR_PTR(-ENOMEM);
388 s->s_mdsc = mdsc;
389 s->s_mds = mds;
390 s->s_state = CEPH_MDS_SESSION_NEW;
391 s->s_ttl = 0;
392 s->s_seq = 0;
393 mutex_init(&s->s_mutex);
394
395 ceph_con_init(mdsc->fsc->client->msgr, &s->s_con);
396 s->s_con.private = s;
397 s->s_con.ops = &mds_con_ops;
398 s->s_con.peer_name.type = CEPH_ENTITY_TYPE_MDS;
399 s->s_con.peer_name.num = cpu_to_le64(mds);
400
401 spin_lock_init(&s->s_cap_lock);
402 s->s_cap_gen = 0;
403 s->s_cap_ttl = 0;
404 s->s_renew_requested = 0;
405 s->s_renew_seq = 0;
406 INIT_LIST_HEAD(&s->s_caps);
407 s->s_nr_caps = 0;
408 s->s_trim_caps = 0;
409 atomic_set(&s->s_ref, 1);
410 INIT_LIST_HEAD(&s->s_waiting);
411 INIT_LIST_HEAD(&s->s_unsafe);
412 s->s_num_cap_releases = 0;
413 s->s_cap_iterator = NULL;
414 INIT_LIST_HEAD(&s->s_cap_releases);
415 INIT_LIST_HEAD(&s->s_cap_releases_done);
416 INIT_LIST_HEAD(&s->s_cap_flushing);
417 INIT_LIST_HEAD(&s->s_cap_snaps_flushing);
418
419 dout("register_session mds%d\n", mds);
420 if (mds >= mdsc->max_sessions) {
421 int newmax = 1 << get_count_order(mds+1);
422 struct ceph_mds_session **sa;
423
424 dout("register_session realloc to %d\n", newmax);
425 sa = kcalloc(newmax, sizeof(void *), GFP_NOFS);
426 if (sa == NULL)
427 goto fail_realloc;
428 if (mdsc->sessions) {
429 memcpy(sa, mdsc->sessions,
430 mdsc->max_sessions * sizeof(void *));
431 kfree(mdsc->sessions);
432 }
433 mdsc->sessions = sa;
434 mdsc->max_sessions = newmax;
435 }
436 mdsc->sessions[mds] = s;
437 atomic_inc(&s->s_ref); /* one ref to sessions[], one to caller */
438
439 ceph_con_open(&s->s_con, ceph_mdsmap_get_addr(mdsc->mdsmap, mds));
440
441 return s;
442
443fail_realloc:
444 kfree(s);
445 return ERR_PTR(-ENOMEM);
446}
447
448/*
449 * called under mdsc->mutex
450 */
451static void __unregister_session(struct ceph_mds_client *mdsc,
452 struct ceph_mds_session *s)
453{
454 dout("__unregister_session mds%d %p\n", s->s_mds, s);
455 BUG_ON(mdsc->sessions[s->s_mds] != s);
456 mdsc->sessions[s->s_mds] = NULL;
457 ceph_con_close(&s->s_con);
458 ceph_put_mds_session(s);
459}
460
461/*
462 * drop session refs in request.
463 *
464 * should be last request ref, or hold mdsc->mutex
465 */
466static void put_request_session(struct ceph_mds_request *req)
467{
468 if (req->r_session) {
469 ceph_put_mds_session(req->r_session);
470 req->r_session = NULL;
471 }
472}
473
474void ceph_mdsc_release_request(struct kref *kref)
475{
476 struct ceph_mds_request *req = container_of(kref,
477 struct ceph_mds_request,
478 r_kref);
479 if (req->r_request)
480 ceph_msg_put(req->r_request);
481 if (req->r_reply) {
482 ceph_msg_put(req->r_reply);
483 destroy_reply_info(&req->r_reply_info);
484 }
485 if (req->r_inode) {
486 ceph_put_cap_refs(ceph_inode(req->r_inode), CEPH_CAP_PIN);
487 iput(req->r_inode);
488 }
489 if (req->r_locked_dir)
490 ceph_put_cap_refs(ceph_inode(req->r_locked_dir), CEPH_CAP_PIN);
491 if (req->r_target_inode)
492 iput(req->r_target_inode);
493 if (req->r_dentry)
494 dput(req->r_dentry);
495 if (req->r_old_dentry) {
496 /*
497 * track (and drop pins for) r_old_dentry_dir
498 * separately, since r_old_dentry's d_parent may have
499 * changed between the dir mutex being dropped and
500 * this request being freed.
501 */
502 ceph_put_cap_refs(ceph_inode(req->r_old_dentry_dir),
503 CEPH_CAP_PIN);
504 dput(req->r_old_dentry);
505 iput(req->r_old_dentry_dir);
506 }
507 kfree(req->r_path1);
508 kfree(req->r_path2);
509 put_request_session(req);
510 ceph_unreserve_caps(req->r_mdsc, &req->r_caps_reservation);
511 kfree(req);
512}
513
514/*
515 * lookup session, bump ref if found.
516 *
517 * called under mdsc->mutex.
518 */
519static struct ceph_mds_request *__lookup_request(struct ceph_mds_client *mdsc,
520 u64 tid)
521{
522 struct ceph_mds_request *req;
523 struct rb_node *n = mdsc->request_tree.rb_node;
524
525 while (n) {
526 req = rb_entry(n, struct ceph_mds_request, r_node);
527 if (tid < req->r_tid)
528 n = n->rb_left;
529 else if (tid > req->r_tid)
530 n = n->rb_right;
531 else {
532 ceph_mdsc_get_request(req);
533 return req;
534 }
535 }
536 return NULL;
537}
538
539static void __insert_request(struct ceph_mds_client *mdsc,
540 struct ceph_mds_request *new)
541{
542 struct rb_node **p = &mdsc->request_tree.rb_node;
543 struct rb_node *parent = NULL;
544 struct ceph_mds_request *req = NULL;
545
546 while (*p) {
547 parent = *p;
548 req = rb_entry(parent, struct ceph_mds_request, r_node);
549 if (new->r_tid < req->r_tid)
550 p = &(*p)->rb_left;
551 else if (new->r_tid > req->r_tid)
552 p = &(*p)->rb_right;
553 else
554 BUG();
555 }
556
557 rb_link_node(&new->r_node, parent, p);
558 rb_insert_color(&new->r_node, &mdsc->request_tree);
559}
560
561/*
562 * Register an in-flight request, and assign a tid. Link to directory
563 * are modifying (if any).
564 *
565 * Called under mdsc->mutex.
566 */
567static void __register_request(struct ceph_mds_client *mdsc,
568 struct ceph_mds_request *req,
569 struct inode *dir)
570{
571 req->r_tid = ++mdsc->last_tid;
572 if (req->r_num_caps)
573 ceph_reserve_caps(mdsc, &req->r_caps_reservation,
574 req->r_num_caps);
575 dout("__register_request %p tid %lld\n", req, req->r_tid);
576 ceph_mdsc_get_request(req);
577 __insert_request(mdsc, req);
578
579 req->r_uid = current_fsuid();
580 req->r_gid = current_fsgid();
581
582 if (dir) {
583 struct ceph_inode_info *ci = ceph_inode(dir);
584
585 ihold(dir);
586 spin_lock(&ci->i_unsafe_lock);
587 req->r_unsafe_dir = dir;
588 list_add_tail(&req->r_unsafe_dir_item, &ci->i_unsafe_dirops);
589 spin_unlock(&ci->i_unsafe_lock);
590 }
591}
592
593static void __unregister_request(struct ceph_mds_client *mdsc,
594 struct ceph_mds_request *req)
595{
596 dout("__unregister_request %p tid %lld\n", req, req->r_tid);
597 rb_erase(&req->r_node, &mdsc->request_tree);
598 RB_CLEAR_NODE(&req->r_node);
599
600 if (req->r_unsafe_dir) {
601 struct ceph_inode_info *ci = ceph_inode(req->r_unsafe_dir);
602
603 spin_lock(&ci->i_unsafe_lock);
604 list_del_init(&req->r_unsafe_dir_item);
605 spin_unlock(&ci->i_unsafe_lock);
606
607 iput(req->r_unsafe_dir);
608 req->r_unsafe_dir = NULL;
609 }
610
611 ceph_mdsc_put_request(req);
612}
613
614/*
615 * Choose mds to send request to next. If there is a hint set in the
616 * request (e.g., due to a prior forward hint from the mds), use that.
617 * Otherwise, consult frag tree and/or caps to identify the
618 * appropriate mds. If all else fails, choose randomly.
619 *
620 * Called under mdsc->mutex.
621 */
622struct dentry *get_nonsnap_parent(struct dentry *dentry)
623{
624 /*
625 * we don't need to worry about protecting the d_parent access
626 * here because we never renaming inside the snapped namespace
627 * except to resplice to another snapdir, and either the old or new
628 * result is a valid result.
629 */
630 while (!IS_ROOT(dentry) && ceph_snap(dentry->d_inode) != CEPH_NOSNAP)
631 dentry = dentry->d_parent;
632 return dentry;
633}
634
635static int __choose_mds(struct ceph_mds_client *mdsc,
636 struct ceph_mds_request *req)
637{
638 struct inode *inode;
639 struct ceph_inode_info *ci;
640 struct ceph_cap *cap;
641 int mode = req->r_direct_mode;
642 int mds = -1;
643 u32 hash = req->r_direct_hash;
644 bool is_hash = req->r_direct_is_hash;
645
646 /*
647 * is there a specific mds we should try? ignore hint if we have
648 * no session and the mds is not up (active or recovering).
649 */
650 if (req->r_resend_mds >= 0 &&
651 (__have_session(mdsc, req->r_resend_mds) ||
652 ceph_mdsmap_get_state(mdsc->mdsmap, req->r_resend_mds) > 0)) {
653 dout("choose_mds using resend_mds mds%d\n",
654 req->r_resend_mds);
655 return req->r_resend_mds;
656 }
657
658 if (mode == USE_RANDOM_MDS)
659 goto random;
660
661 inode = NULL;
662 if (req->r_inode) {
663 inode = req->r_inode;
664 } else if (req->r_dentry) {
665 /* ignore race with rename; old or new d_parent is okay */
666 struct dentry *parent = req->r_dentry->d_parent;
667 struct inode *dir = parent->d_inode;
668
669 if (dir->i_sb != mdsc->fsc->sb) {
670 /* not this fs! */
671 inode = req->r_dentry->d_inode;
672 } else if (ceph_snap(dir) != CEPH_NOSNAP) {
673 /* direct snapped/virtual snapdir requests
674 * based on parent dir inode */
675 struct dentry *dn = get_nonsnap_parent(parent);
676 inode = dn->d_inode;
677 dout("__choose_mds using nonsnap parent %p\n", inode);
678 } else if (req->r_dentry->d_inode) {
679 /* dentry target */
680 inode = req->r_dentry->d_inode;
681 } else {
682 /* dir + name */
683 inode = dir;
684 hash = ceph_dentry_hash(dir, req->r_dentry);
685 is_hash = true;
686 }
687 }
688
689 dout("__choose_mds %p is_hash=%d (%d) mode %d\n", inode, (int)is_hash,
690 (int)hash, mode);
691 if (!inode)
692 goto random;
693 ci = ceph_inode(inode);
694
695 if (is_hash && S_ISDIR(inode->i_mode)) {
696 struct ceph_inode_frag frag;
697 int found;
698
699 ceph_choose_frag(ci, hash, &frag, &found);
700 if (found) {
701 if (mode == USE_ANY_MDS && frag.ndist > 0) {
702 u8 r;
703
704 /* choose a random replica */
705 get_random_bytes(&r, 1);
706 r %= frag.ndist;
707 mds = frag.dist[r];
708 dout("choose_mds %p %llx.%llx "
709 "frag %u mds%d (%d/%d)\n",
710 inode, ceph_vinop(inode),
711 frag.frag, mds,
712 (int)r, frag.ndist);
713 if (ceph_mdsmap_get_state(mdsc->mdsmap, mds) >=
714 CEPH_MDS_STATE_ACTIVE)
715 return mds;
716 }
717
718 /* since this file/dir wasn't known to be
719 * replicated, then we want to look for the
720 * authoritative mds. */
721 mode = USE_AUTH_MDS;
722 if (frag.mds >= 0) {
723 /* choose auth mds */
724 mds = frag.mds;
725 dout("choose_mds %p %llx.%llx "
726 "frag %u mds%d (auth)\n",
727 inode, ceph_vinop(inode), frag.frag, mds);
728 if (ceph_mdsmap_get_state(mdsc->mdsmap, mds) >=
729 CEPH_MDS_STATE_ACTIVE)
730 return mds;
731 }
732 }
733 }
734
735 spin_lock(&inode->i_lock);
736 cap = NULL;
737 if (mode == USE_AUTH_MDS)
738 cap = ci->i_auth_cap;
739 if (!cap && !RB_EMPTY_ROOT(&ci->i_caps))
740 cap = rb_entry(rb_first(&ci->i_caps), struct ceph_cap, ci_node);
741 if (!cap) {
742 spin_unlock(&inode->i_lock);
743 goto random;
744 }
745 mds = cap->session->s_mds;
746 dout("choose_mds %p %llx.%llx mds%d (%scap %p)\n",
747 inode, ceph_vinop(inode), mds,
748 cap == ci->i_auth_cap ? "auth " : "", cap);
749 spin_unlock(&inode->i_lock);
750 return mds;
751
752random:
753 mds = ceph_mdsmap_get_random_mds(mdsc->mdsmap);
754 dout("choose_mds chose random mds%d\n", mds);
755 return mds;
756}
757
758
759/*
760 * session messages
761 */
762static struct ceph_msg *create_session_msg(u32 op, u64 seq)
763{
764 struct ceph_msg *msg;
765 struct ceph_mds_session_head *h;
766
767 msg = ceph_msg_new(CEPH_MSG_CLIENT_SESSION, sizeof(*h), GFP_NOFS);
768 if (!msg) {
769 pr_err("create_session_msg ENOMEM creating msg\n");
770 return NULL;
771 }
772 h = msg->front.iov_base;
773 h->op = cpu_to_le32(op);
774 h->seq = cpu_to_le64(seq);
775 return msg;
776}
777
778/*
779 * send session open request.
780 *
781 * called under mdsc->mutex
782 */
783static int __open_session(struct ceph_mds_client *mdsc,
784 struct ceph_mds_session *session)
785{
786 struct ceph_msg *msg;
787 int mstate;
788 int mds = session->s_mds;
789
790 /* wait for mds to go active? */
791 mstate = ceph_mdsmap_get_state(mdsc->mdsmap, mds);
792 dout("open_session to mds%d (%s)\n", mds,
793 ceph_mds_state_name(mstate));
794 session->s_state = CEPH_MDS_SESSION_OPENING;
795 session->s_renew_requested = jiffies;
796
797 /* send connect message */
798 msg = create_session_msg(CEPH_SESSION_REQUEST_OPEN, session->s_seq);
799 if (!msg)
800 return -ENOMEM;
801 ceph_con_send(&session->s_con, msg);
802 return 0;
803}
804
805/*
806 * open sessions for any export targets for the given mds
807 *
808 * called under mdsc->mutex
809 */
810static void __open_export_target_sessions(struct ceph_mds_client *mdsc,
811 struct ceph_mds_session *session)
812{
813 struct ceph_mds_info *mi;
814 struct ceph_mds_session *ts;
815 int i, mds = session->s_mds;
816 int target;
817
818 if (mds >= mdsc->mdsmap->m_max_mds)
819 return;
820 mi = &mdsc->mdsmap->m_info[mds];
821 dout("open_export_target_sessions for mds%d (%d targets)\n",
822 session->s_mds, mi->num_export_targets);
823
824 for (i = 0; i < mi->num_export_targets; i++) {
825 target = mi->export_targets[i];
826 ts = __ceph_lookup_mds_session(mdsc, target);
827 if (!ts) {
828 ts = register_session(mdsc, target);
829 if (IS_ERR(ts))
830 return;
831 }
832 if (session->s_state == CEPH_MDS_SESSION_NEW ||
833 session->s_state == CEPH_MDS_SESSION_CLOSING)
834 __open_session(mdsc, session);
835 else
836 dout(" mds%d target mds%d %p is %s\n", session->s_mds,
837 i, ts, session_state_name(ts->s_state));
838 ceph_put_mds_session(ts);
839 }
840}
841
842void ceph_mdsc_open_export_target_sessions(struct ceph_mds_client *mdsc,
843 struct ceph_mds_session *session)
844{
845 mutex_lock(&mdsc->mutex);
846 __open_export_target_sessions(mdsc, session);
847 mutex_unlock(&mdsc->mutex);
848}
849
850/*
851 * session caps
852 */
853
854/*
855 * Free preallocated cap messages assigned to this session
856 */
857static void cleanup_cap_releases(struct ceph_mds_session *session)
858{
859 struct ceph_msg *msg;
860
861 spin_lock(&session->s_cap_lock);
862 while (!list_empty(&session->s_cap_releases)) {
863 msg = list_first_entry(&session->s_cap_releases,
864 struct ceph_msg, list_head);
865 list_del_init(&msg->list_head);
866 ceph_msg_put(msg);
867 }
868 while (!list_empty(&session->s_cap_releases_done)) {
869 msg = list_first_entry(&session->s_cap_releases_done,
870 struct ceph_msg, list_head);
871 list_del_init(&msg->list_head);
872 ceph_msg_put(msg);
873 }
874 spin_unlock(&session->s_cap_lock);
875}
876
877/*
878 * Helper to safely iterate over all caps associated with a session, with
879 * special care taken to handle a racing __ceph_remove_cap().
880 *
881 * Caller must hold session s_mutex.
882 */
883static int iterate_session_caps(struct ceph_mds_session *session,
884 int (*cb)(struct inode *, struct ceph_cap *,
885 void *), void *arg)
886{
887 struct list_head *p;
888 struct ceph_cap *cap;
889 struct inode *inode, *last_inode = NULL;
890 struct ceph_cap *old_cap = NULL;
891 int ret;
892
893 dout("iterate_session_caps %p mds%d\n", session, session->s_mds);
894 spin_lock(&session->s_cap_lock);
895 p = session->s_caps.next;
896 while (p != &session->s_caps) {
897 cap = list_entry(p, struct ceph_cap, session_caps);
898 inode = igrab(&cap->ci->vfs_inode);
899 if (!inode) {
900 p = p->next;
901 continue;
902 }
903 session->s_cap_iterator = cap;
904 spin_unlock(&session->s_cap_lock);
905
906 if (last_inode) {
907 iput(last_inode);
908 last_inode = NULL;
909 }
910 if (old_cap) {
911 ceph_put_cap(session->s_mdsc, old_cap);
912 old_cap = NULL;
913 }
914
915 ret = cb(inode, cap, arg);
916 last_inode = inode;
917
918 spin_lock(&session->s_cap_lock);
919 p = p->next;
920 if (cap->ci == NULL) {
921 dout("iterate_session_caps finishing cap %p removal\n",
922 cap);
923 BUG_ON(cap->session != session);
924 list_del_init(&cap->session_caps);
925 session->s_nr_caps--;
926 cap->session = NULL;
927 old_cap = cap; /* put_cap it w/o locks held */
928 }
929 if (ret < 0)
930 goto out;
931 }
932 ret = 0;
933out:
934 session->s_cap_iterator = NULL;
935 spin_unlock(&session->s_cap_lock);
936
937 if (last_inode)
938 iput(last_inode);
939 if (old_cap)
940 ceph_put_cap(session->s_mdsc, old_cap);
941
942 return ret;
943}
944
945static int remove_session_caps_cb(struct inode *inode, struct ceph_cap *cap,
946 void *arg)
947{
948 struct ceph_inode_info *ci = ceph_inode(inode);
949 int drop = 0;
950
951 dout("removing cap %p, ci is %p, inode is %p\n",
952 cap, ci, &ci->vfs_inode);
953 spin_lock(&inode->i_lock);
954 __ceph_remove_cap(cap);
955 if (!__ceph_is_any_real_caps(ci)) {
956 struct ceph_mds_client *mdsc =
957 ceph_sb_to_client(inode->i_sb)->mdsc;
958
959 spin_lock(&mdsc->cap_dirty_lock);
960 if (!list_empty(&ci->i_dirty_item)) {
961 pr_info(" dropping dirty %s state for %p %lld\n",
962 ceph_cap_string(ci->i_dirty_caps),
963 inode, ceph_ino(inode));
964 ci->i_dirty_caps = 0;
965 list_del_init(&ci->i_dirty_item);
966 drop = 1;
967 }
968 if (!list_empty(&ci->i_flushing_item)) {
969 pr_info(" dropping dirty+flushing %s state for %p %lld\n",
970 ceph_cap_string(ci->i_flushing_caps),
971 inode, ceph_ino(inode));
972 ci->i_flushing_caps = 0;
973 list_del_init(&ci->i_flushing_item);
974 mdsc->num_cap_flushing--;
975 drop = 1;
976 }
977 if (drop && ci->i_wrbuffer_ref) {
978 pr_info(" dropping dirty data for %p %lld\n",
979 inode, ceph_ino(inode));
980 ci->i_wrbuffer_ref = 0;
981 ci->i_wrbuffer_ref_head = 0;
982 drop++;
983 }
984 spin_unlock(&mdsc->cap_dirty_lock);
985 }
986 spin_unlock(&inode->i_lock);
987 while (drop--)
988 iput(inode);
989 return 0;
990}
991
992/*
993 * caller must hold session s_mutex
994 */
995static void remove_session_caps(struct ceph_mds_session *session)
996{
997 dout("remove_session_caps on %p\n", session);
998 iterate_session_caps(session, remove_session_caps_cb, NULL);
999 BUG_ON(session->s_nr_caps > 0);
1000 BUG_ON(!list_empty(&session->s_cap_flushing));
1001 cleanup_cap_releases(session);
1002}
1003
1004/*
1005 * wake up any threads waiting on this session's caps. if the cap is
1006 * old (didn't get renewed on the client reconnect), remove it now.
1007 *
1008 * caller must hold s_mutex.
1009 */
1010static int wake_up_session_cb(struct inode *inode, struct ceph_cap *cap,
1011 void *arg)
1012{
1013 struct ceph_inode_info *ci = ceph_inode(inode);
1014
1015 wake_up_all(&ci->i_cap_wq);
1016 if (arg) {
1017 spin_lock(&inode->i_lock);
1018 ci->i_wanted_max_size = 0;
1019 ci->i_requested_max_size = 0;
1020 spin_unlock(&inode->i_lock);
1021 }
1022 return 0;
1023}
1024
1025static void wake_up_session_caps(struct ceph_mds_session *session,
1026 int reconnect)
1027{
1028 dout("wake_up_session_caps %p mds%d\n", session, session->s_mds);
1029 iterate_session_caps(session, wake_up_session_cb,
1030 (void *)(unsigned long)reconnect);
1031}
1032
1033/*
1034 * Send periodic message to MDS renewing all currently held caps. The
1035 * ack will reset the expiration for all caps from this session.
1036 *
1037 * caller holds s_mutex
1038 */
1039static int send_renew_caps(struct ceph_mds_client *mdsc,
1040 struct ceph_mds_session *session)
1041{
1042 struct ceph_msg *msg;
1043 int state;
1044
1045 if (time_after_eq(jiffies, session->s_cap_ttl) &&
1046 time_after_eq(session->s_cap_ttl, session->s_renew_requested))
1047 pr_info("mds%d caps stale\n", session->s_mds);
1048 session->s_renew_requested = jiffies;
1049
1050 /* do not try to renew caps until a recovering mds has reconnected
1051 * with its clients. */
1052 state = ceph_mdsmap_get_state(mdsc->mdsmap, session->s_mds);
1053 if (state < CEPH_MDS_STATE_RECONNECT) {
1054 dout("send_renew_caps ignoring mds%d (%s)\n",
1055 session->s_mds, ceph_mds_state_name(state));
1056 return 0;
1057 }
1058
1059 dout("send_renew_caps to mds%d (%s)\n", session->s_mds,
1060 ceph_mds_state_name(state));
1061 msg = create_session_msg(CEPH_SESSION_REQUEST_RENEWCAPS,
1062 ++session->s_renew_seq);
1063 if (!msg)
1064 return -ENOMEM;
1065 ceph_con_send(&session->s_con, msg);
1066 return 0;
1067}
1068
1069/*
1070 * Note new cap ttl, and any transition from stale -> not stale (fresh?).
1071 *
1072 * Called under session->s_mutex
1073 */
1074static void renewed_caps(struct ceph_mds_client *mdsc,
1075 struct ceph_mds_session *session, int is_renew)
1076{
1077 int was_stale;
1078 int wake = 0;
1079
1080 spin_lock(&session->s_cap_lock);
1081 was_stale = is_renew && (session->s_cap_ttl == 0 ||
1082 time_after_eq(jiffies, session->s_cap_ttl));
1083
1084 session->s_cap_ttl = session->s_renew_requested +
1085 mdsc->mdsmap->m_session_timeout*HZ;
1086
1087 if (was_stale) {
1088 if (time_before(jiffies, session->s_cap_ttl)) {
1089 pr_info("mds%d caps renewed\n", session->s_mds);
1090 wake = 1;
1091 } else {
1092 pr_info("mds%d caps still stale\n", session->s_mds);
1093 }
1094 }
1095 dout("renewed_caps mds%d ttl now %lu, was %s, now %s\n",
1096 session->s_mds, session->s_cap_ttl, was_stale ? "stale" : "fresh",
1097 time_before(jiffies, session->s_cap_ttl) ? "stale" : "fresh");
1098 spin_unlock(&session->s_cap_lock);
1099
1100 if (wake)
1101 wake_up_session_caps(session, 0);
1102}
1103
1104/*
1105 * send a session close request
1106 */
1107static int request_close_session(struct ceph_mds_client *mdsc,
1108 struct ceph_mds_session *session)
1109{
1110 struct ceph_msg *msg;
1111
1112 dout("request_close_session mds%d state %s seq %lld\n",
1113 session->s_mds, session_state_name(session->s_state),
1114 session->s_seq);
1115 msg = create_session_msg(CEPH_SESSION_REQUEST_CLOSE, session->s_seq);
1116 if (!msg)
1117 return -ENOMEM;
1118 ceph_con_send(&session->s_con, msg);
1119 return 0;
1120}
1121
1122/*
1123 * Called with s_mutex held.
1124 */
1125static int __close_session(struct ceph_mds_client *mdsc,
1126 struct ceph_mds_session *session)
1127{
1128 if (session->s_state >= CEPH_MDS_SESSION_CLOSING)
1129 return 0;
1130 session->s_state = CEPH_MDS_SESSION_CLOSING;
1131 return request_close_session(mdsc, session);
1132}
1133
1134/*
1135 * Trim old(er) caps.
1136 *
1137 * Because we can't cache an inode without one or more caps, we do
1138 * this indirectly: if a cap is unused, we prune its aliases, at which
1139 * point the inode will hopefully get dropped to.
1140 *
1141 * Yes, this is a bit sloppy. Our only real goal here is to respond to
1142 * memory pressure from the MDS, though, so it needn't be perfect.
1143 */
1144static int trim_caps_cb(struct inode *inode, struct ceph_cap *cap, void *arg)
1145{
1146 struct ceph_mds_session *session = arg;
1147 struct ceph_inode_info *ci = ceph_inode(inode);
1148 int used, oissued, mine;
1149
1150 if (session->s_trim_caps <= 0)
1151 return -1;
1152
1153 spin_lock(&inode->i_lock);
1154 mine = cap->issued | cap->implemented;
1155 used = __ceph_caps_used(ci);
1156 oissued = __ceph_caps_issued_other(ci, cap);
1157
1158 dout("trim_caps_cb %p cap %p mine %s oissued %s used %s\n",
1159 inode, cap, ceph_cap_string(mine), ceph_cap_string(oissued),
1160 ceph_cap_string(used));
1161 if (ci->i_dirty_caps)
1162 goto out; /* dirty caps */
1163 if ((used & ~oissued) & mine)
1164 goto out; /* we need these caps */
1165
1166 session->s_trim_caps--;
1167 if (oissued) {
1168 /* we aren't the only cap.. just remove us */
1169 __ceph_remove_cap(cap);
1170 } else {
1171 /* try to drop referring dentries */
1172 spin_unlock(&inode->i_lock);
1173 d_prune_aliases(inode);
1174 dout("trim_caps_cb %p cap %p pruned, count now %d\n",
1175 inode, cap, atomic_read(&inode->i_count));
1176 return 0;
1177 }
1178
1179out:
1180 spin_unlock(&inode->i_lock);
1181 return 0;
1182}
1183
1184/*
1185 * Trim session cap count down to some max number.
1186 */
1187static int trim_caps(struct ceph_mds_client *mdsc,
1188 struct ceph_mds_session *session,
1189 int max_caps)
1190{
1191 int trim_caps = session->s_nr_caps - max_caps;
1192
1193 dout("trim_caps mds%d start: %d / %d, trim %d\n",
1194 session->s_mds, session->s_nr_caps, max_caps, trim_caps);
1195 if (trim_caps > 0) {
1196 session->s_trim_caps = trim_caps;
1197 iterate_session_caps(session, trim_caps_cb, session);
1198 dout("trim_caps mds%d done: %d / %d, trimmed %d\n",
1199 session->s_mds, session->s_nr_caps, max_caps,
1200 trim_caps - session->s_trim_caps);
1201 session->s_trim_caps = 0;
1202 }
1203 return 0;
1204}
1205
1206/*
1207 * Allocate cap_release messages. If there is a partially full message
1208 * in the queue, try to allocate enough to cover it's remainder, so that
1209 * we can send it immediately.
1210 *
1211 * Called under s_mutex.
1212 */
1213int ceph_add_cap_releases(struct ceph_mds_client *mdsc,
1214 struct ceph_mds_session *session)
1215{
1216 struct ceph_msg *msg, *partial = NULL;
1217 struct ceph_mds_cap_release *head;
1218 int err = -ENOMEM;
1219 int extra = mdsc->fsc->mount_options->cap_release_safety;
1220 int num;
1221
1222 dout("add_cap_releases %p mds%d extra %d\n", session, session->s_mds,
1223 extra);
1224
1225 spin_lock(&session->s_cap_lock);
1226
1227 if (!list_empty(&session->s_cap_releases)) {
1228 msg = list_first_entry(&session->s_cap_releases,
1229 struct ceph_msg,
1230 list_head);
1231 head = msg->front.iov_base;
1232 num = le32_to_cpu(head->num);
1233 if (num) {
1234 dout(" partial %p with (%d/%d)\n", msg, num,
1235 (int)CEPH_CAPS_PER_RELEASE);
1236 extra += CEPH_CAPS_PER_RELEASE - num;
1237 partial = msg;
1238 }
1239 }
1240 while (session->s_num_cap_releases < session->s_nr_caps + extra) {
1241 spin_unlock(&session->s_cap_lock);
1242 msg = ceph_msg_new(CEPH_MSG_CLIENT_CAPRELEASE, PAGE_CACHE_SIZE,
1243 GFP_NOFS);
1244 if (!msg)
1245 goto out_unlocked;
1246 dout("add_cap_releases %p msg %p now %d\n", session, msg,
1247 (int)msg->front.iov_len);
1248 head = msg->front.iov_base;
1249 head->num = cpu_to_le32(0);
1250 msg->front.iov_len = sizeof(*head);
1251 spin_lock(&session->s_cap_lock);
1252 list_add(&msg->list_head, &session->s_cap_releases);
1253 session->s_num_cap_releases += CEPH_CAPS_PER_RELEASE;
1254 }
1255
1256 if (partial) {
1257 head = partial->front.iov_base;
1258 num = le32_to_cpu(head->num);
1259 dout(" queueing partial %p with %d/%d\n", partial, num,
1260 (int)CEPH_CAPS_PER_RELEASE);
1261 list_move_tail(&partial->list_head,
1262 &session->s_cap_releases_done);
1263 session->s_num_cap_releases -= CEPH_CAPS_PER_RELEASE - num;
1264 }
1265 err = 0;
1266 spin_unlock(&session->s_cap_lock);
1267out_unlocked:
1268 return err;
1269}
1270
1271/*
1272 * flush all dirty inode data to disk.
1273 *
1274 * returns true if we've flushed through want_flush_seq
1275 */
1276static int check_cap_flush(struct ceph_mds_client *mdsc, u64 want_flush_seq)
1277{
1278 int mds, ret = 1;
1279
1280 dout("check_cap_flush want %lld\n", want_flush_seq);
1281 mutex_lock(&mdsc->mutex);
1282 for (mds = 0; ret && mds < mdsc->max_sessions; mds++) {
1283 struct ceph_mds_session *session = mdsc->sessions[mds];
1284
1285 if (!session)
1286 continue;
1287 get_session(session);
1288 mutex_unlock(&mdsc->mutex);
1289
1290 mutex_lock(&session->s_mutex);
1291 if (!list_empty(&session->s_cap_flushing)) {
1292 struct ceph_inode_info *ci =
1293 list_entry(session->s_cap_flushing.next,
1294 struct ceph_inode_info,
1295 i_flushing_item);
1296 struct inode *inode = &ci->vfs_inode;
1297
1298 spin_lock(&inode->i_lock);
1299 if (ci->i_cap_flush_seq <= want_flush_seq) {
1300 dout("check_cap_flush still flushing %p "
1301 "seq %lld <= %lld to mds%d\n", inode,
1302 ci->i_cap_flush_seq, want_flush_seq,
1303 session->s_mds);
1304 ret = 0;
1305 }
1306 spin_unlock(&inode->i_lock);
1307 }
1308 mutex_unlock(&session->s_mutex);
1309 ceph_put_mds_session(session);
1310
1311 if (!ret)
1312 return ret;
1313 mutex_lock(&mdsc->mutex);
1314 }
1315
1316 mutex_unlock(&mdsc->mutex);
1317 dout("check_cap_flush ok, flushed thru %lld\n", want_flush_seq);
1318 return ret;
1319}
1320
1321/*
1322 * called under s_mutex
1323 */
1324void ceph_send_cap_releases(struct ceph_mds_client *mdsc,
1325 struct ceph_mds_session *session)
1326{
1327 struct ceph_msg *msg;
1328
1329 dout("send_cap_releases mds%d\n", session->s_mds);
1330 spin_lock(&session->s_cap_lock);
1331 while (!list_empty(&session->s_cap_releases_done)) {
1332 msg = list_first_entry(&session->s_cap_releases_done,
1333 struct ceph_msg, list_head);
1334 list_del_init(&msg->list_head);
1335 spin_unlock(&session->s_cap_lock);
1336 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
1337 dout("send_cap_releases mds%d %p\n", session->s_mds, msg);
1338 ceph_con_send(&session->s_con, msg);
1339 spin_lock(&session->s_cap_lock);
1340 }
1341 spin_unlock(&session->s_cap_lock);
1342}
1343
1344static void discard_cap_releases(struct ceph_mds_client *mdsc,
1345 struct ceph_mds_session *session)
1346{
1347 struct ceph_msg *msg;
1348 struct ceph_mds_cap_release *head;
1349 unsigned num;
1350
1351 dout("discard_cap_releases mds%d\n", session->s_mds);
1352 spin_lock(&session->s_cap_lock);
1353
1354 /* zero out the in-progress message */
1355 msg = list_first_entry(&session->s_cap_releases,
1356 struct ceph_msg, list_head);
1357 head = msg->front.iov_base;
1358 num = le32_to_cpu(head->num);
1359 dout("discard_cap_releases mds%d %p %u\n", session->s_mds, msg, num);
1360 head->num = cpu_to_le32(0);
1361 session->s_num_cap_releases += num;
1362
1363 /* requeue completed messages */
1364 while (!list_empty(&session->s_cap_releases_done)) {
1365 msg = list_first_entry(&session->s_cap_releases_done,
1366 struct ceph_msg, list_head);
1367 list_del_init(&msg->list_head);
1368
1369 head = msg->front.iov_base;
1370 num = le32_to_cpu(head->num);
1371 dout("discard_cap_releases mds%d %p %u\n", session->s_mds, msg,
1372 num);
1373 session->s_num_cap_releases += num;
1374 head->num = cpu_to_le32(0);
1375 msg->front.iov_len = sizeof(*head);
1376 list_add(&msg->list_head, &session->s_cap_releases);
1377 }
1378
1379 spin_unlock(&session->s_cap_lock);
1380}
1381
1382/*
1383 * requests
1384 */
1385
1386/*
1387 * Create an mds request.
1388 */
1389struct ceph_mds_request *
1390ceph_mdsc_create_request(struct ceph_mds_client *mdsc, int op, int mode)
1391{
1392 struct ceph_mds_request *req = kzalloc(sizeof(*req), GFP_NOFS);
1393
1394 if (!req)
1395 return ERR_PTR(-ENOMEM);
1396
1397 mutex_init(&req->r_fill_mutex);
1398 req->r_mdsc = mdsc;
1399 req->r_started = jiffies;
1400 req->r_resend_mds = -1;
1401 INIT_LIST_HEAD(&req->r_unsafe_dir_item);
1402 req->r_fmode = -1;
1403 kref_init(&req->r_kref);
1404 INIT_LIST_HEAD(&req->r_wait);
1405 init_completion(&req->r_completion);
1406 init_completion(&req->r_safe_completion);
1407 INIT_LIST_HEAD(&req->r_unsafe_item);
1408
1409 req->r_op = op;
1410 req->r_direct_mode = mode;
1411 return req;
1412}
1413
1414/*
1415 * return oldest (lowest) request, tid in request tree, 0 if none.
1416 *
1417 * called under mdsc->mutex.
1418 */
1419static struct ceph_mds_request *__get_oldest_req(struct ceph_mds_client *mdsc)
1420{
1421 if (RB_EMPTY_ROOT(&mdsc->request_tree))
1422 return NULL;
1423 return rb_entry(rb_first(&mdsc->request_tree),
1424 struct ceph_mds_request, r_node);
1425}
1426
1427static u64 __get_oldest_tid(struct ceph_mds_client *mdsc)
1428{
1429 struct ceph_mds_request *req = __get_oldest_req(mdsc);
1430
1431 if (req)
1432 return req->r_tid;
1433 return 0;
1434}
1435
1436/*
1437 * Build a dentry's path. Allocate on heap; caller must kfree. Based
1438 * on build_path_from_dentry in fs/cifs/dir.c.
1439 *
1440 * If @stop_on_nosnap, generate path relative to the first non-snapped
1441 * inode.
1442 *
1443 * Encode hidden .snap dirs as a double /, i.e.
1444 * foo/.snap/bar -> foo//bar
1445 */
1446char *ceph_mdsc_build_path(struct dentry *dentry, int *plen, u64 *base,
1447 int stop_on_nosnap)
1448{
1449 struct dentry *temp;
1450 char *path;
1451 int len, pos;
1452 unsigned seq;
1453
1454 if (dentry == NULL)
1455 return ERR_PTR(-EINVAL);
1456
1457retry:
1458 len = 0;
1459 seq = read_seqbegin(&rename_lock);
1460 rcu_read_lock();
1461 for (temp = dentry; !IS_ROOT(temp);) {
1462 struct inode *inode = temp->d_inode;
1463 if (inode && ceph_snap(inode) == CEPH_SNAPDIR)
1464 len++; /* slash only */
1465 else if (stop_on_nosnap && inode &&
1466 ceph_snap(inode) == CEPH_NOSNAP)
1467 break;
1468 else
1469 len += 1 + temp->d_name.len;
1470 temp = temp->d_parent;
1471 if (temp == NULL) {
1472 rcu_read_unlock();
1473 pr_err("build_path corrupt dentry %p\n", dentry);
1474 return ERR_PTR(-EINVAL);
1475 }
1476 }
1477 rcu_read_unlock();
1478 if (len)
1479 len--; /* no leading '/' */
1480
1481 path = kmalloc(len+1, GFP_NOFS);
1482 if (path == NULL)
1483 return ERR_PTR(-ENOMEM);
1484 pos = len;
1485 path[pos] = 0; /* trailing null */
1486 rcu_read_lock();
1487 for (temp = dentry; !IS_ROOT(temp) && pos != 0; ) {
1488 struct inode *inode;
1489
1490 spin_lock(&temp->d_lock);
1491 inode = temp->d_inode;
1492 if (inode && ceph_snap(inode) == CEPH_SNAPDIR) {
1493 dout("build_path path+%d: %p SNAPDIR\n",
1494 pos, temp);
1495 } else if (stop_on_nosnap && inode &&
1496 ceph_snap(inode) == CEPH_NOSNAP) {
1497 break;
1498 } else {
1499 pos -= temp->d_name.len;
1500 if (pos < 0) {
1501 spin_unlock(&temp->d_lock);
1502 break;
1503 }
1504 strncpy(path + pos, temp->d_name.name,
1505 temp->d_name.len);
1506 }
1507 spin_unlock(&temp->d_lock);
1508 if (pos)
1509 path[--pos] = '/';
1510 temp = temp->d_parent;
1511 if (temp == NULL) {
1512 rcu_read_unlock();
1513 pr_err("build_path corrupt dentry\n");
1514 kfree(path);
1515 return ERR_PTR(-EINVAL);
1516 }
1517 }
1518 rcu_read_unlock();
1519 if (pos != 0 || read_seqretry(&rename_lock, seq)) {
1520 pr_err("build_path did not end path lookup where "
1521 "expected, namelen is %d, pos is %d\n", len, pos);
1522 /* presumably this is only possible if racing with a
1523 rename of one of the parent directories (we can not
1524 lock the dentries above us to prevent this, but
1525 retrying should be harmless) */
1526 kfree(path);
1527 goto retry;
1528 }
1529
1530 *base = ceph_ino(temp->d_inode);
1531 *plen = len;
1532 dout("build_path on %p %d built %llx '%.*s'\n",
1533 dentry, dentry->d_count, *base, len, path);
1534 return path;
1535}
1536
1537static int build_dentry_path(struct dentry *dentry,
1538 const char **ppath, int *ppathlen, u64 *pino,
1539 int *pfreepath)
1540{
1541 char *path;
1542
1543 if (ceph_snap(dentry->d_parent->d_inode) == CEPH_NOSNAP) {
1544 *pino = ceph_ino(dentry->d_parent->d_inode);
1545 *ppath = dentry->d_name.name;
1546 *ppathlen = dentry->d_name.len;
1547 return 0;
1548 }
1549 path = ceph_mdsc_build_path(dentry, ppathlen, pino, 1);
1550 if (IS_ERR(path))
1551 return PTR_ERR(path);
1552 *ppath = path;
1553 *pfreepath = 1;
1554 return 0;
1555}
1556
1557static int build_inode_path(struct inode *inode,
1558 const char **ppath, int *ppathlen, u64 *pino,
1559 int *pfreepath)
1560{
1561 struct dentry *dentry;
1562 char *path;
1563
1564 if (ceph_snap(inode) == CEPH_NOSNAP) {
1565 *pino = ceph_ino(inode);
1566 *ppathlen = 0;
1567 return 0;
1568 }
1569 dentry = d_find_alias(inode);
1570 path = ceph_mdsc_build_path(dentry, ppathlen, pino, 1);
1571 dput(dentry);
1572 if (IS_ERR(path))
1573 return PTR_ERR(path);
1574 *ppath = path;
1575 *pfreepath = 1;
1576 return 0;
1577}
1578
1579/*
1580 * request arguments may be specified via an inode *, a dentry *, or
1581 * an explicit ino+path.
1582 */
1583static int set_request_path_attr(struct inode *rinode, struct dentry *rdentry,
1584 const char *rpath, u64 rino,
1585 const char **ppath, int *pathlen,
1586 u64 *ino, int *freepath)
1587{
1588 int r = 0;
1589
1590 if (rinode) {
1591 r = build_inode_path(rinode, ppath, pathlen, ino, freepath);
1592 dout(" inode %p %llx.%llx\n", rinode, ceph_ino(rinode),
1593 ceph_snap(rinode));
1594 } else if (rdentry) {
1595 r = build_dentry_path(rdentry, ppath, pathlen, ino, freepath);
1596 dout(" dentry %p %llx/%.*s\n", rdentry, *ino, *pathlen,
1597 *ppath);
1598 } else if (rpath || rino) {
1599 *ino = rino;
1600 *ppath = rpath;
1601 *pathlen = strlen(rpath);
1602 dout(" path %.*s\n", *pathlen, rpath);
1603 }
1604
1605 return r;
1606}
1607
1608/*
1609 * called under mdsc->mutex
1610 */
1611static struct ceph_msg *create_request_message(struct ceph_mds_client *mdsc,
1612 struct ceph_mds_request *req,
1613 int mds)
1614{
1615 struct ceph_msg *msg;
1616 struct ceph_mds_request_head *head;
1617 const char *path1 = NULL;
1618 const char *path2 = NULL;
1619 u64 ino1 = 0, ino2 = 0;
1620 int pathlen1 = 0, pathlen2 = 0;
1621 int freepath1 = 0, freepath2 = 0;
1622 int len;
1623 u16 releases;
1624 void *p, *end;
1625 int ret;
1626
1627 ret = set_request_path_attr(req->r_inode, req->r_dentry,
1628 req->r_path1, req->r_ino1.ino,
1629 &path1, &pathlen1, &ino1, &freepath1);
1630 if (ret < 0) {
1631 msg = ERR_PTR(ret);
1632 goto out;
1633 }
1634
1635 ret = set_request_path_attr(NULL, req->r_old_dentry,
1636 req->r_path2, req->r_ino2.ino,
1637 &path2, &pathlen2, &ino2, &freepath2);
1638 if (ret < 0) {
1639 msg = ERR_PTR(ret);
1640 goto out_free1;
1641 }
1642
1643 len = sizeof(*head) +
1644 pathlen1 + pathlen2 + 2*(1 + sizeof(u32) + sizeof(u64));
1645
1646 /* calculate (max) length for cap releases */
1647 len += sizeof(struct ceph_mds_request_release) *
1648 (!!req->r_inode_drop + !!req->r_dentry_drop +
1649 !!req->r_old_inode_drop + !!req->r_old_dentry_drop);
1650 if (req->r_dentry_drop)
1651 len += req->r_dentry->d_name.len;
1652 if (req->r_old_dentry_drop)
1653 len += req->r_old_dentry->d_name.len;
1654
1655 msg = ceph_msg_new(CEPH_MSG_CLIENT_REQUEST, len, GFP_NOFS);
1656 if (!msg) {
1657 msg = ERR_PTR(-ENOMEM);
1658 goto out_free2;
1659 }
1660
1661 msg->hdr.tid = cpu_to_le64(req->r_tid);
1662
1663 head = msg->front.iov_base;
1664 p = msg->front.iov_base + sizeof(*head);
1665 end = msg->front.iov_base + msg->front.iov_len;
1666
1667 head->mdsmap_epoch = cpu_to_le32(mdsc->mdsmap->m_epoch);
1668 head->op = cpu_to_le32(req->r_op);
1669 head->caller_uid = cpu_to_le32(req->r_uid);
1670 head->caller_gid = cpu_to_le32(req->r_gid);
1671 head->args = req->r_args;
1672
1673 ceph_encode_filepath(&p, end, ino1, path1);
1674 ceph_encode_filepath(&p, end, ino2, path2);
1675
1676 /* make note of release offset, in case we need to replay */
1677 req->r_request_release_offset = p - msg->front.iov_base;
1678
1679 /* cap releases */
1680 releases = 0;
1681 if (req->r_inode_drop)
1682 releases += ceph_encode_inode_release(&p,
1683 req->r_inode ? req->r_inode : req->r_dentry->d_inode,
1684 mds, req->r_inode_drop, req->r_inode_unless, 0);
1685 if (req->r_dentry_drop)
1686 releases += ceph_encode_dentry_release(&p, req->r_dentry,
1687 mds, req->r_dentry_drop, req->r_dentry_unless);
1688 if (req->r_old_dentry_drop)
1689 releases += ceph_encode_dentry_release(&p, req->r_old_dentry,
1690 mds, req->r_old_dentry_drop, req->r_old_dentry_unless);
1691 if (req->r_old_inode_drop)
1692 releases += ceph_encode_inode_release(&p,
1693 req->r_old_dentry->d_inode,
1694 mds, req->r_old_inode_drop, req->r_old_inode_unless, 0);
1695 head->num_releases = cpu_to_le16(releases);
1696
1697 BUG_ON(p > end);
1698 msg->front.iov_len = p - msg->front.iov_base;
1699 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
1700
1701 msg->pages = req->r_pages;
1702 msg->nr_pages = req->r_num_pages;
1703 msg->hdr.data_len = cpu_to_le32(req->r_data_len);
1704 msg->hdr.data_off = cpu_to_le16(0);
1705
1706out_free2:
1707 if (freepath2)
1708 kfree((char *)path2);
1709out_free1:
1710 if (freepath1)
1711 kfree((char *)path1);
1712out:
1713 return msg;
1714}
1715
1716/*
1717 * called under mdsc->mutex if error, under no mutex if
1718 * success.
1719 */
1720static void complete_request(struct ceph_mds_client *mdsc,
1721 struct ceph_mds_request *req)
1722{
1723 if (req->r_callback)
1724 req->r_callback(mdsc, req);
1725 else
1726 complete_all(&req->r_completion);
1727}
1728
1729/*
1730 * called under mdsc->mutex
1731 */
1732static int __prepare_send_request(struct ceph_mds_client *mdsc,
1733 struct ceph_mds_request *req,
1734 int mds)
1735{
1736 struct ceph_mds_request_head *rhead;
1737 struct ceph_msg *msg;
1738 int flags = 0;
1739
1740 req->r_attempts++;
1741 if (req->r_inode) {
1742 struct ceph_cap *cap =
1743 ceph_get_cap_for_mds(ceph_inode(req->r_inode), mds);
1744
1745 if (cap)
1746 req->r_sent_on_mseq = cap->mseq;
1747 else
1748 req->r_sent_on_mseq = -1;
1749 }
1750 dout("prepare_send_request %p tid %lld %s (attempt %d)\n", req,
1751 req->r_tid, ceph_mds_op_name(req->r_op), req->r_attempts);
1752
1753 if (req->r_got_unsafe) {
1754 /*
1755 * Replay. Do not regenerate message (and rebuild
1756 * paths, etc.); just use the original message.
1757 * Rebuilding paths will break for renames because
1758 * d_move mangles the src name.
1759 */
1760 msg = req->r_request;
1761 rhead = msg->front.iov_base;
1762
1763 flags = le32_to_cpu(rhead->flags);
1764 flags |= CEPH_MDS_FLAG_REPLAY;
1765 rhead->flags = cpu_to_le32(flags);
1766
1767 if (req->r_target_inode)
1768 rhead->ino = cpu_to_le64(ceph_ino(req->r_target_inode));
1769
1770 rhead->num_retry = req->r_attempts - 1;
1771
1772 /* remove cap/dentry releases from message */
1773 rhead->num_releases = 0;
1774 msg->hdr.front_len = cpu_to_le32(req->r_request_release_offset);
1775 msg->front.iov_len = req->r_request_release_offset;
1776 return 0;
1777 }
1778
1779 if (req->r_request) {
1780 ceph_msg_put(req->r_request);
1781 req->r_request = NULL;
1782 }
1783 msg = create_request_message(mdsc, req, mds);
1784 if (IS_ERR(msg)) {
1785 req->r_err = PTR_ERR(msg);
1786 complete_request(mdsc, req);
1787 return PTR_ERR(msg);
1788 }
1789 req->r_request = msg;
1790
1791 rhead = msg->front.iov_base;
1792 rhead->oldest_client_tid = cpu_to_le64(__get_oldest_tid(mdsc));
1793 if (req->r_got_unsafe)
1794 flags |= CEPH_MDS_FLAG_REPLAY;
1795 if (req->r_locked_dir)
1796 flags |= CEPH_MDS_FLAG_WANT_DENTRY;
1797 rhead->flags = cpu_to_le32(flags);
1798 rhead->num_fwd = req->r_num_fwd;
1799 rhead->num_retry = req->r_attempts - 1;
1800 rhead->ino = 0;
1801
1802 dout(" r_locked_dir = %p\n", req->r_locked_dir);
1803 return 0;
1804}
1805
1806/*
1807 * send request, or put it on the appropriate wait list.
1808 */
1809static int __do_request(struct ceph_mds_client *mdsc,
1810 struct ceph_mds_request *req)
1811{
1812 struct ceph_mds_session *session = NULL;
1813 int mds = -1;
1814 int err = -EAGAIN;
1815
1816 if (req->r_err || req->r_got_result)
1817 goto out;
1818
1819 if (req->r_timeout &&
1820 time_after_eq(jiffies, req->r_started + req->r_timeout)) {
1821 dout("do_request timed out\n");
1822 err = -EIO;
1823 goto finish;
1824 }
1825
1826 put_request_session(req);
1827
1828 mds = __choose_mds(mdsc, req);
1829 if (mds < 0 ||
1830 ceph_mdsmap_get_state(mdsc->mdsmap, mds) < CEPH_MDS_STATE_ACTIVE) {
1831 dout("do_request no mds or not active, waiting for map\n");
1832 list_add(&req->r_wait, &mdsc->waiting_for_map);
1833 goto out;
1834 }
1835
1836 /* get, open session */
1837 session = __ceph_lookup_mds_session(mdsc, mds);
1838 if (!session) {
1839 session = register_session(mdsc, mds);
1840 if (IS_ERR(session)) {
1841 err = PTR_ERR(session);
1842 goto finish;
1843 }
1844 }
1845 req->r_session = get_session(session);
1846
1847 dout("do_request mds%d session %p state %s\n", mds, session,
1848 session_state_name(session->s_state));
1849 if (session->s_state != CEPH_MDS_SESSION_OPEN &&
1850 session->s_state != CEPH_MDS_SESSION_HUNG) {
1851 if (session->s_state == CEPH_MDS_SESSION_NEW ||
1852 session->s_state == CEPH_MDS_SESSION_CLOSING)
1853 __open_session(mdsc, session);
1854 list_add(&req->r_wait, &session->s_waiting);
1855 goto out_session;
1856 }
1857
1858 /* send request */
1859 req->r_resend_mds = -1; /* forget any previous mds hint */
1860
1861 if (req->r_request_started == 0) /* note request start time */
1862 req->r_request_started = jiffies;
1863
1864 err = __prepare_send_request(mdsc, req, mds);
1865 if (!err) {
1866 ceph_msg_get(req->r_request);
1867 ceph_con_send(&session->s_con, req->r_request);
1868 }
1869
1870out_session:
1871 ceph_put_mds_session(session);
1872out:
1873 return err;
1874
1875finish:
1876 req->r_err = err;
1877 complete_request(mdsc, req);
1878 goto out;
1879}
1880
1881/*
1882 * called under mdsc->mutex
1883 */
1884static void __wake_requests(struct ceph_mds_client *mdsc,
1885 struct list_head *head)
1886{
1887 struct ceph_mds_request *req, *nreq;
1888
1889 list_for_each_entry_safe(req, nreq, head, r_wait) {
1890 list_del_init(&req->r_wait);
1891 __do_request(mdsc, req);
1892 }
1893}
1894
1895/*
1896 * Wake up threads with requests pending for @mds, so that they can
1897 * resubmit their requests to a possibly different mds.
1898 */
1899static void kick_requests(struct ceph_mds_client *mdsc, int mds)
1900{
1901 struct ceph_mds_request *req;
1902 struct rb_node *p;
1903
1904 dout("kick_requests mds%d\n", mds);
1905 for (p = rb_first(&mdsc->request_tree); p; p = rb_next(p)) {
1906 req = rb_entry(p, struct ceph_mds_request, r_node);
1907 if (req->r_got_unsafe)
1908 continue;
1909 if (req->r_session &&
1910 req->r_session->s_mds == mds) {
1911 dout(" kicking tid %llu\n", req->r_tid);
1912 __do_request(mdsc, req);
1913 }
1914 }
1915}
1916
1917void ceph_mdsc_submit_request(struct ceph_mds_client *mdsc,
1918 struct ceph_mds_request *req)
1919{
1920 dout("submit_request on %p\n", req);
1921 mutex_lock(&mdsc->mutex);
1922 __register_request(mdsc, req, NULL);
1923 __do_request(mdsc, req);
1924 mutex_unlock(&mdsc->mutex);
1925}
1926
1927/*
1928 * Synchrously perform an mds request. Take care of all of the
1929 * session setup, forwarding, retry details.
1930 */
1931int ceph_mdsc_do_request(struct ceph_mds_client *mdsc,
1932 struct inode *dir,
1933 struct ceph_mds_request *req)
1934{
1935 int err;
1936
1937 dout("do_request on %p\n", req);
1938
1939 /* take CAP_PIN refs for r_inode, r_locked_dir, r_old_dentry */
1940 if (req->r_inode)
1941 ceph_get_cap_refs(ceph_inode(req->r_inode), CEPH_CAP_PIN);
1942 if (req->r_locked_dir)
1943 ceph_get_cap_refs(ceph_inode(req->r_locked_dir), CEPH_CAP_PIN);
1944 if (req->r_old_dentry)
1945 ceph_get_cap_refs(ceph_inode(req->r_old_dentry_dir),
1946 CEPH_CAP_PIN);
1947
1948 /* issue */
1949 mutex_lock(&mdsc->mutex);
1950 __register_request(mdsc, req, dir);
1951 __do_request(mdsc, req);
1952
1953 if (req->r_err) {
1954 err = req->r_err;
1955 __unregister_request(mdsc, req);
1956 dout("do_request early error %d\n", err);
1957 goto out;
1958 }
1959
1960 /* wait */
1961 mutex_unlock(&mdsc->mutex);
1962 dout("do_request waiting\n");
1963 if (req->r_timeout) {
1964 err = (long)wait_for_completion_killable_timeout(
1965 &req->r_completion, req->r_timeout);
1966 if (err == 0)
1967 err = -EIO;
1968 } else {
1969 err = wait_for_completion_killable(&req->r_completion);
1970 }
1971 dout("do_request waited, got %d\n", err);
1972 mutex_lock(&mdsc->mutex);
1973
1974 /* only abort if we didn't race with a real reply */
1975 if (req->r_got_result) {
1976 err = le32_to_cpu(req->r_reply_info.head->result);
1977 } else if (err < 0) {
1978 dout("aborted request %lld with %d\n", req->r_tid, err);
1979
1980 /*
1981 * ensure we aren't running concurrently with
1982 * ceph_fill_trace or ceph_readdir_prepopulate, which
1983 * rely on locks (dir mutex) held by our caller.
1984 */
1985 mutex_lock(&req->r_fill_mutex);
1986 req->r_err = err;
1987 req->r_aborted = true;
1988 mutex_unlock(&req->r_fill_mutex);
1989
1990 if (req->r_locked_dir &&
1991 (req->r_op & CEPH_MDS_OP_WRITE))
1992 ceph_invalidate_dir_request(req);
1993 } else {
1994 err = req->r_err;
1995 }
1996
1997out:
1998 mutex_unlock(&mdsc->mutex);
1999 dout("do_request %p done, result %d\n", req, err);
2000 return err;
2001}
2002
2003/*
2004 * Invalidate dir I_COMPLETE, dentry lease state on an aborted MDS
2005 * namespace request.
2006 */
2007void ceph_invalidate_dir_request(struct ceph_mds_request *req)
2008{
2009 struct inode *inode = req->r_locked_dir;
2010 struct ceph_inode_info *ci = ceph_inode(inode);
2011
2012 dout("invalidate_dir_request %p (I_COMPLETE, lease(s))\n", inode);
2013 spin_lock(&inode->i_lock);
2014 ci->i_ceph_flags &= ~CEPH_I_COMPLETE;
2015 ci->i_release_count++;
2016 spin_unlock(&inode->i_lock);
2017
2018 if (req->r_dentry)
2019 ceph_invalidate_dentry_lease(req->r_dentry);
2020 if (req->r_old_dentry)
2021 ceph_invalidate_dentry_lease(req->r_old_dentry);
2022}
2023
2024/*
2025 * Handle mds reply.
2026 *
2027 * We take the session mutex and parse and process the reply immediately.
2028 * This preserves the logical ordering of replies, capabilities, etc., sent
2029 * by the MDS as they are applied to our local cache.
2030 */
2031static void handle_reply(struct ceph_mds_session *session, struct ceph_msg *msg)
2032{
2033 struct ceph_mds_client *mdsc = session->s_mdsc;
2034 struct ceph_mds_request *req;
2035 struct ceph_mds_reply_head *head = msg->front.iov_base;
2036 struct ceph_mds_reply_info_parsed *rinfo; /* parsed reply info */
2037 u64 tid;
2038 int err, result;
2039 int mds = session->s_mds;
2040
2041 if (msg->front.iov_len < sizeof(*head)) {
2042 pr_err("mdsc_handle_reply got corrupt (short) reply\n");
2043 ceph_msg_dump(msg);
2044 return;
2045 }
2046
2047 /* get request, session */
2048 tid = le64_to_cpu(msg->hdr.tid);
2049 mutex_lock(&mdsc->mutex);
2050 req = __lookup_request(mdsc, tid);
2051 if (!req) {
2052 dout("handle_reply on unknown tid %llu\n", tid);
2053 mutex_unlock(&mdsc->mutex);
2054 return;
2055 }
2056 dout("handle_reply %p\n", req);
2057
2058 /* correct session? */
2059 if (req->r_session != session) {
2060 pr_err("mdsc_handle_reply got %llu on session mds%d"
2061 " not mds%d\n", tid, session->s_mds,
2062 req->r_session ? req->r_session->s_mds : -1);
2063 mutex_unlock(&mdsc->mutex);
2064 goto out;
2065 }
2066
2067 /* dup? */
2068 if ((req->r_got_unsafe && !head->safe) ||
2069 (req->r_got_safe && head->safe)) {
2070 pr_warning("got a dup %s reply on %llu from mds%d\n",
2071 head->safe ? "safe" : "unsafe", tid, mds);
2072 mutex_unlock(&mdsc->mutex);
2073 goto out;
2074 }
2075 if (req->r_got_safe && !head->safe) {
2076 pr_warning("got unsafe after safe on %llu from mds%d\n",
2077 tid, mds);
2078 mutex_unlock(&mdsc->mutex);
2079 goto out;
2080 }
2081
2082 result = le32_to_cpu(head->result);
2083
2084 /*
2085 * Handle an ESTALE
2086 * if we're not talking to the authority, send to them
2087 * if the authority has changed while we weren't looking,
2088 * send to new authority
2089 * Otherwise we just have to return an ESTALE
2090 */
2091 if (result == -ESTALE) {
2092 dout("got ESTALE on request %llu", req->r_tid);
2093 if (!req->r_inode) {
2094 /* do nothing; not an authority problem */
2095 } else if (req->r_direct_mode != USE_AUTH_MDS) {
2096 dout("not using auth, setting for that now");
2097 req->r_direct_mode = USE_AUTH_MDS;
2098 __do_request(mdsc, req);
2099 mutex_unlock(&mdsc->mutex);
2100 goto out;
2101 } else {
2102 struct ceph_inode_info *ci = ceph_inode(req->r_inode);
2103 struct ceph_cap *cap = NULL;
2104
2105 if (req->r_session)
2106 cap = ceph_get_cap_for_mds(ci,
2107 req->r_session->s_mds);
2108
2109 dout("already using auth");
2110 if ((!cap || cap != ci->i_auth_cap) ||
2111 (cap->mseq != req->r_sent_on_mseq)) {
2112 dout("but cap changed, so resending");
2113 __do_request(mdsc, req);
2114 mutex_unlock(&mdsc->mutex);
2115 goto out;
2116 }
2117 }
2118 dout("have to return ESTALE on request %llu", req->r_tid);
2119 }
2120
2121
2122 if (head->safe) {
2123 req->r_got_safe = true;
2124 __unregister_request(mdsc, req);
2125 complete_all(&req->r_safe_completion);
2126
2127 if (req->r_got_unsafe) {
2128 /*
2129 * We already handled the unsafe response, now do the
2130 * cleanup. No need to examine the response; the MDS
2131 * doesn't include any result info in the safe
2132 * response. And even if it did, there is nothing
2133 * useful we could do with a revised return value.
2134 */
2135 dout("got safe reply %llu, mds%d\n", tid, mds);
2136 list_del_init(&req->r_unsafe_item);
2137
2138 /* last unsafe request during umount? */
2139 if (mdsc->stopping && !__get_oldest_req(mdsc))
2140 complete_all(&mdsc->safe_umount_waiters);
2141 mutex_unlock(&mdsc->mutex);
2142 goto out;
2143 }
2144 } else {
2145 req->r_got_unsafe = true;
2146 list_add_tail(&req->r_unsafe_item, &req->r_session->s_unsafe);
2147 }
2148
2149 dout("handle_reply tid %lld result %d\n", tid, result);
2150 rinfo = &req->r_reply_info;
2151 err = parse_reply_info(msg, rinfo, session->s_con.peer_features);
2152 mutex_unlock(&mdsc->mutex);
2153
2154 mutex_lock(&session->s_mutex);
2155 if (err < 0) {
2156 pr_err("mdsc_handle_reply got corrupt reply mds%d(tid:%lld)\n", mds, tid);
2157 ceph_msg_dump(msg);
2158 goto out_err;
2159 }
2160
2161 /* snap trace */
2162 if (rinfo->snapblob_len) {
2163 down_write(&mdsc->snap_rwsem);
2164 ceph_update_snap_trace(mdsc, rinfo->snapblob,
2165 rinfo->snapblob + rinfo->snapblob_len,
2166 le32_to_cpu(head->op) == CEPH_MDS_OP_RMSNAP);
2167 downgrade_write(&mdsc->snap_rwsem);
2168 } else {
2169 down_read(&mdsc->snap_rwsem);
2170 }
2171
2172 /* insert trace into our cache */
2173 mutex_lock(&req->r_fill_mutex);
2174 err = ceph_fill_trace(mdsc->fsc->sb, req, req->r_session);
2175 if (err == 0) {
2176 if (result == 0 && req->r_op != CEPH_MDS_OP_GETFILELOCK &&
2177 rinfo->dir_nr)
2178 ceph_readdir_prepopulate(req, req->r_session);
2179 ceph_unreserve_caps(mdsc, &req->r_caps_reservation);
2180 }
2181 mutex_unlock(&req->r_fill_mutex);
2182
2183 up_read(&mdsc->snap_rwsem);
2184out_err:
2185 mutex_lock(&mdsc->mutex);
2186 if (!req->r_aborted) {
2187 if (err) {
2188 req->r_err = err;
2189 } else {
2190 req->r_reply = msg;
2191 ceph_msg_get(msg);
2192 req->r_got_result = true;
2193 }
2194 } else {
2195 dout("reply arrived after request %lld was aborted\n", tid);
2196 }
2197 mutex_unlock(&mdsc->mutex);
2198
2199 ceph_add_cap_releases(mdsc, req->r_session);
2200 mutex_unlock(&session->s_mutex);
2201
2202 /* kick calling process */
2203 complete_request(mdsc, req);
2204out:
2205 ceph_mdsc_put_request(req);
2206 return;
2207}
2208
2209
2210
2211/*
2212 * handle mds notification that our request has been forwarded.
2213 */
2214static void handle_forward(struct ceph_mds_client *mdsc,
2215 struct ceph_mds_session *session,
2216 struct ceph_msg *msg)
2217{
2218 struct ceph_mds_request *req;
2219 u64 tid = le64_to_cpu(msg->hdr.tid);
2220 u32 next_mds;
2221 u32 fwd_seq;
2222 int err = -EINVAL;
2223 void *p = msg->front.iov_base;
2224 void *end = p + msg->front.iov_len;
2225
2226 ceph_decode_need(&p, end, 2*sizeof(u32), bad);
2227 next_mds = ceph_decode_32(&p);
2228 fwd_seq = ceph_decode_32(&p);
2229
2230 mutex_lock(&mdsc->mutex);
2231 req = __lookup_request(mdsc, tid);
2232 if (!req) {
2233 dout("forward tid %llu to mds%d - req dne\n", tid, next_mds);
2234 goto out; /* dup reply? */
2235 }
2236
2237 if (req->r_aborted) {
2238 dout("forward tid %llu aborted, unregistering\n", tid);
2239 __unregister_request(mdsc, req);
2240 } else if (fwd_seq <= req->r_num_fwd) {
2241 dout("forward tid %llu to mds%d - old seq %d <= %d\n",
2242 tid, next_mds, req->r_num_fwd, fwd_seq);
2243 } else {
2244 /* resend. forward race not possible; mds would drop */
2245 dout("forward tid %llu to mds%d (we resend)\n", tid, next_mds);
2246 BUG_ON(req->r_err);
2247 BUG_ON(req->r_got_result);
2248 req->r_num_fwd = fwd_seq;
2249 req->r_resend_mds = next_mds;
2250 put_request_session(req);
2251 __do_request(mdsc, req);
2252 }
2253 ceph_mdsc_put_request(req);
2254out:
2255 mutex_unlock(&mdsc->mutex);
2256 return;
2257
2258bad:
2259 pr_err("mdsc_handle_forward decode error err=%d\n", err);
2260}
2261
2262/*
2263 * handle a mds session control message
2264 */
2265static void handle_session(struct ceph_mds_session *session,
2266 struct ceph_msg *msg)
2267{
2268 struct ceph_mds_client *mdsc = session->s_mdsc;
2269 u32 op;
2270 u64 seq;
2271 int mds = session->s_mds;
2272 struct ceph_mds_session_head *h = msg->front.iov_base;
2273 int wake = 0;
2274
2275 /* decode */
2276 if (msg->front.iov_len != sizeof(*h))
2277 goto bad;
2278 op = le32_to_cpu(h->op);
2279 seq = le64_to_cpu(h->seq);
2280
2281 mutex_lock(&mdsc->mutex);
2282 if (op == CEPH_SESSION_CLOSE)
2283 __unregister_session(mdsc, session);
2284 /* FIXME: this ttl calculation is generous */
2285 session->s_ttl = jiffies + HZ*mdsc->mdsmap->m_session_autoclose;
2286 mutex_unlock(&mdsc->mutex);
2287
2288 mutex_lock(&session->s_mutex);
2289
2290 dout("handle_session mds%d %s %p state %s seq %llu\n",
2291 mds, ceph_session_op_name(op), session,
2292 session_state_name(session->s_state), seq);
2293
2294 if (session->s_state == CEPH_MDS_SESSION_HUNG) {
2295 session->s_state = CEPH_MDS_SESSION_OPEN;
2296 pr_info("mds%d came back\n", session->s_mds);
2297 }
2298
2299 switch (op) {
2300 case CEPH_SESSION_OPEN:
2301 if (session->s_state == CEPH_MDS_SESSION_RECONNECTING)
2302 pr_info("mds%d reconnect success\n", session->s_mds);
2303 session->s_state = CEPH_MDS_SESSION_OPEN;
2304 renewed_caps(mdsc, session, 0);
2305 wake = 1;
2306 if (mdsc->stopping)
2307 __close_session(mdsc, session);
2308 break;
2309
2310 case CEPH_SESSION_RENEWCAPS:
2311 if (session->s_renew_seq == seq)
2312 renewed_caps(mdsc, session, 1);
2313 break;
2314
2315 case CEPH_SESSION_CLOSE:
2316 if (session->s_state == CEPH_MDS_SESSION_RECONNECTING)
2317 pr_info("mds%d reconnect denied\n", session->s_mds);
2318 remove_session_caps(session);
2319 wake = 1; /* for good measure */
2320 wake_up_all(&mdsc->session_close_wq);
2321 kick_requests(mdsc, mds);
2322 break;
2323
2324 case CEPH_SESSION_STALE:
2325 pr_info("mds%d caps went stale, renewing\n",
2326 session->s_mds);
2327 spin_lock(&session->s_cap_lock);
2328 session->s_cap_gen++;
2329 session->s_cap_ttl = 0;
2330 spin_unlock(&session->s_cap_lock);
2331 send_renew_caps(mdsc, session);
2332 break;
2333
2334 case CEPH_SESSION_RECALL_STATE:
2335 trim_caps(mdsc, session, le32_to_cpu(h->max_caps));
2336 break;
2337
2338 default:
2339 pr_err("mdsc_handle_session bad op %d mds%d\n", op, mds);
2340 WARN_ON(1);
2341 }
2342
2343 mutex_unlock(&session->s_mutex);
2344 if (wake) {
2345 mutex_lock(&mdsc->mutex);
2346 __wake_requests(mdsc, &session->s_waiting);
2347 mutex_unlock(&mdsc->mutex);
2348 }
2349 return;
2350
2351bad:
2352 pr_err("mdsc_handle_session corrupt message mds%d len %d\n", mds,
2353 (int)msg->front.iov_len);
2354 ceph_msg_dump(msg);
2355 return;
2356}
2357
2358
2359/*
2360 * called under session->mutex.
2361 */
2362static void replay_unsafe_requests(struct ceph_mds_client *mdsc,
2363 struct ceph_mds_session *session)
2364{
2365 struct ceph_mds_request *req, *nreq;
2366 int err;
2367
2368 dout("replay_unsafe_requests mds%d\n", session->s_mds);
2369
2370 mutex_lock(&mdsc->mutex);
2371 list_for_each_entry_safe(req, nreq, &session->s_unsafe, r_unsafe_item) {
2372 err = __prepare_send_request(mdsc, req, session->s_mds);
2373 if (!err) {
2374 ceph_msg_get(req->r_request);
2375 ceph_con_send(&session->s_con, req->r_request);
2376 }
2377 }
2378 mutex_unlock(&mdsc->mutex);
2379}
2380
2381/*
2382 * Encode information about a cap for a reconnect with the MDS.
2383 */
2384static int encode_caps_cb(struct inode *inode, struct ceph_cap *cap,
2385 void *arg)
2386{
2387 union {
2388 struct ceph_mds_cap_reconnect v2;
2389 struct ceph_mds_cap_reconnect_v1 v1;
2390 } rec;
2391 size_t reclen;
2392 struct ceph_inode_info *ci;
2393 struct ceph_reconnect_state *recon_state = arg;
2394 struct ceph_pagelist *pagelist = recon_state->pagelist;
2395 char *path;
2396 int pathlen, err;
2397 u64 pathbase;
2398 struct dentry *dentry;
2399
2400 ci = cap->ci;
2401
2402 dout(" adding %p ino %llx.%llx cap %p %lld %s\n",
2403 inode, ceph_vinop(inode), cap, cap->cap_id,
2404 ceph_cap_string(cap->issued));
2405 err = ceph_pagelist_encode_64(pagelist, ceph_ino(inode));
2406 if (err)
2407 return err;
2408
2409 dentry = d_find_alias(inode);
2410 if (dentry) {
2411 path = ceph_mdsc_build_path(dentry, &pathlen, &pathbase, 0);
2412 if (IS_ERR(path)) {
2413 err = PTR_ERR(path);
2414 goto out_dput;
2415 }
2416 } else {
2417 path = NULL;
2418 pathlen = 0;
2419 }
2420 err = ceph_pagelist_encode_string(pagelist, path, pathlen);
2421 if (err)
2422 goto out_free;
2423
2424 spin_lock(&inode->i_lock);
2425 cap->seq = 0; /* reset cap seq */
2426 cap->issue_seq = 0; /* and issue_seq */
2427
2428 if (recon_state->flock) {
2429 rec.v2.cap_id = cpu_to_le64(cap->cap_id);
2430 rec.v2.wanted = cpu_to_le32(__ceph_caps_wanted(ci));
2431 rec.v2.issued = cpu_to_le32(cap->issued);
2432 rec.v2.snaprealm = cpu_to_le64(ci->i_snap_realm->ino);
2433 rec.v2.pathbase = cpu_to_le64(pathbase);
2434 rec.v2.flock_len = 0;
2435 reclen = sizeof(rec.v2);
2436 } else {
2437 rec.v1.cap_id = cpu_to_le64(cap->cap_id);
2438 rec.v1.wanted = cpu_to_le32(__ceph_caps_wanted(ci));
2439 rec.v1.issued = cpu_to_le32(cap->issued);
2440 rec.v1.size = cpu_to_le64(inode->i_size);
2441 ceph_encode_timespec(&rec.v1.mtime, &inode->i_mtime);
2442 ceph_encode_timespec(&rec.v1.atime, &inode->i_atime);
2443 rec.v1.snaprealm = cpu_to_le64(ci->i_snap_realm->ino);
2444 rec.v1.pathbase = cpu_to_le64(pathbase);
2445 reclen = sizeof(rec.v1);
2446 }
2447 spin_unlock(&inode->i_lock);
2448
2449 if (recon_state->flock) {
2450 int num_fcntl_locks, num_flock_locks;
2451 struct ceph_pagelist_cursor trunc_point;
2452
2453 ceph_pagelist_set_cursor(pagelist, &trunc_point);
2454 do {
2455 lock_flocks();
2456 ceph_count_locks(inode, &num_fcntl_locks,
2457 &num_flock_locks);
2458 rec.v2.flock_len = (2*sizeof(u32) +
2459 (num_fcntl_locks+num_flock_locks) *
2460 sizeof(struct ceph_filelock));
2461 unlock_flocks();
2462
2463 /* pre-alloc pagelist */
2464 ceph_pagelist_truncate(pagelist, &trunc_point);
2465 err = ceph_pagelist_append(pagelist, &rec, reclen);
2466 if (!err)
2467 err = ceph_pagelist_reserve(pagelist,
2468 rec.v2.flock_len);
2469
2470 /* encode locks */
2471 if (!err) {
2472 lock_flocks();
2473 err = ceph_encode_locks(inode,
2474 pagelist,
2475 num_fcntl_locks,
2476 num_flock_locks);
2477 unlock_flocks();
2478 }
2479 } while (err == -ENOSPC);
2480 } else {
2481 err = ceph_pagelist_append(pagelist, &rec, reclen);
2482 }
2483
2484out_free:
2485 kfree(path);
2486out_dput:
2487 dput(dentry);
2488 return err;
2489}
2490
2491
2492/*
2493 * If an MDS fails and recovers, clients need to reconnect in order to
2494 * reestablish shared state. This includes all caps issued through
2495 * this session _and_ the snap_realm hierarchy. Because it's not
2496 * clear which snap realms the mds cares about, we send everything we
2497 * know about.. that ensures we'll then get any new info the
2498 * recovering MDS might have.
2499 *
2500 * This is a relatively heavyweight operation, but it's rare.
2501 *
2502 * called with mdsc->mutex held.
2503 */
2504static void send_mds_reconnect(struct ceph_mds_client *mdsc,
2505 struct ceph_mds_session *session)
2506{
2507 struct ceph_msg *reply;
2508 struct rb_node *p;
2509 int mds = session->s_mds;
2510 int err = -ENOMEM;
2511 struct ceph_pagelist *pagelist;
2512 struct ceph_reconnect_state recon_state;
2513
2514 pr_info("mds%d reconnect start\n", mds);
2515
2516 pagelist = kmalloc(sizeof(*pagelist), GFP_NOFS);
2517 if (!pagelist)
2518 goto fail_nopagelist;
2519 ceph_pagelist_init(pagelist);
2520
2521 reply = ceph_msg_new(CEPH_MSG_CLIENT_RECONNECT, 0, GFP_NOFS);
2522 if (!reply)
2523 goto fail_nomsg;
2524
2525 mutex_lock(&session->s_mutex);
2526 session->s_state = CEPH_MDS_SESSION_RECONNECTING;
2527 session->s_seq = 0;
2528
2529 ceph_con_open(&session->s_con,
2530 ceph_mdsmap_get_addr(mdsc->mdsmap, mds));
2531
2532 /* replay unsafe requests */
2533 replay_unsafe_requests(mdsc, session);
2534
2535 down_read(&mdsc->snap_rwsem);
2536
2537 dout("session %p state %s\n", session,
2538 session_state_name(session->s_state));
2539
2540 /* drop old cap expires; we're about to reestablish that state */
2541 discard_cap_releases(mdsc, session);
2542
2543 /* traverse this session's caps */
2544 err = ceph_pagelist_encode_32(pagelist, session->s_nr_caps);
2545 if (err)
2546 goto fail;
2547
2548 recon_state.pagelist = pagelist;
2549 recon_state.flock = session->s_con.peer_features & CEPH_FEATURE_FLOCK;
2550 err = iterate_session_caps(session, encode_caps_cb, &recon_state);
2551 if (err < 0)
2552 goto fail;
2553
2554 /*
2555 * snaprealms. we provide mds with the ino, seq (version), and
2556 * parent for all of our realms. If the mds has any newer info,
2557 * it will tell us.
2558 */
2559 for (p = rb_first(&mdsc->snap_realms); p; p = rb_next(p)) {
2560 struct ceph_snap_realm *realm =
2561 rb_entry(p, struct ceph_snap_realm, node);
2562 struct ceph_mds_snaprealm_reconnect sr_rec;
2563
2564 dout(" adding snap realm %llx seq %lld parent %llx\n",
2565 realm->ino, realm->seq, realm->parent_ino);
2566 sr_rec.ino = cpu_to_le64(realm->ino);
2567 sr_rec.seq = cpu_to_le64(realm->seq);
2568 sr_rec.parent = cpu_to_le64(realm->parent_ino);
2569 err = ceph_pagelist_append(pagelist, &sr_rec, sizeof(sr_rec));
2570 if (err)
2571 goto fail;
2572 }
2573
2574 reply->pagelist = pagelist;
2575 if (recon_state.flock)
2576 reply->hdr.version = cpu_to_le16(2);
2577 reply->hdr.data_len = cpu_to_le32(pagelist->length);
2578 reply->nr_pages = calc_pages_for(0, pagelist->length);
2579 ceph_con_send(&session->s_con, reply);
2580
2581 mutex_unlock(&session->s_mutex);
2582
2583 mutex_lock(&mdsc->mutex);
2584 __wake_requests(mdsc, &session->s_waiting);
2585 mutex_unlock(&mdsc->mutex);
2586
2587 up_read(&mdsc->snap_rwsem);
2588 return;
2589
2590fail:
2591 ceph_msg_put(reply);
2592 up_read(&mdsc->snap_rwsem);
2593 mutex_unlock(&session->s_mutex);
2594fail_nomsg:
2595 ceph_pagelist_release(pagelist);
2596 kfree(pagelist);
2597fail_nopagelist:
2598 pr_err("error %d preparing reconnect for mds%d\n", err, mds);
2599 return;
2600}
2601
2602
2603/*
2604 * compare old and new mdsmaps, kicking requests
2605 * and closing out old connections as necessary
2606 *
2607 * called under mdsc->mutex.
2608 */
2609static void check_new_map(struct ceph_mds_client *mdsc,
2610 struct ceph_mdsmap *newmap,
2611 struct ceph_mdsmap *oldmap)
2612{
2613 int i;
2614 int oldstate, newstate;
2615 struct ceph_mds_session *s;
2616
2617 dout("check_new_map new %u old %u\n",
2618 newmap->m_epoch, oldmap->m_epoch);
2619
2620 for (i = 0; i < oldmap->m_max_mds && i < mdsc->max_sessions; i++) {
2621 if (mdsc->sessions[i] == NULL)
2622 continue;
2623 s = mdsc->sessions[i];
2624 oldstate = ceph_mdsmap_get_state(oldmap, i);
2625 newstate = ceph_mdsmap_get_state(newmap, i);
2626
2627 dout("check_new_map mds%d state %s%s -> %s%s (session %s)\n",
2628 i, ceph_mds_state_name(oldstate),
2629 ceph_mdsmap_is_laggy(oldmap, i) ? " (laggy)" : "",
2630 ceph_mds_state_name(newstate),
2631 ceph_mdsmap_is_laggy(newmap, i) ? " (laggy)" : "",
2632 session_state_name(s->s_state));
2633
2634 if (memcmp(ceph_mdsmap_get_addr(oldmap, i),
2635 ceph_mdsmap_get_addr(newmap, i),
2636 sizeof(struct ceph_entity_addr))) {
2637 if (s->s_state == CEPH_MDS_SESSION_OPENING) {
2638 /* the session never opened, just close it
2639 * out now */
2640 __wake_requests(mdsc, &s->s_waiting);
2641 __unregister_session(mdsc, s);
2642 } else {
2643 /* just close it */
2644 mutex_unlock(&mdsc->mutex);
2645 mutex_lock(&s->s_mutex);
2646 mutex_lock(&mdsc->mutex);
2647 ceph_con_close(&s->s_con);
2648 mutex_unlock(&s->s_mutex);
2649 s->s_state = CEPH_MDS_SESSION_RESTARTING;
2650 }
2651
2652 /* kick any requests waiting on the recovering mds */
2653 kick_requests(mdsc, i);
2654 } else if (oldstate == newstate) {
2655 continue; /* nothing new with this mds */
2656 }
2657
2658 /*
2659 * send reconnect?
2660 */
2661 if (s->s_state == CEPH_MDS_SESSION_RESTARTING &&
2662 newstate >= CEPH_MDS_STATE_RECONNECT) {
2663 mutex_unlock(&mdsc->mutex);
2664 send_mds_reconnect(mdsc, s);
2665 mutex_lock(&mdsc->mutex);
2666 }
2667
2668 /*
2669 * kick request on any mds that has gone active.
2670 */
2671 if (oldstate < CEPH_MDS_STATE_ACTIVE &&
2672 newstate >= CEPH_MDS_STATE_ACTIVE) {
2673 if (oldstate != CEPH_MDS_STATE_CREATING &&
2674 oldstate != CEPH_MDS_STATE_STARTING)
2675 pr_info("mds%d recovery completed\n", s->s_mds);
2676 kick_requests(mdsc, i);
2677 ceph_kick_flushing_caps(mdsc, s);
2678 wake_up_session_caps(s, 1);
2679 }
2680 }
2681
2682 for (i = 0; i < newmap->m_max_mds && i < mdsc->max_sessions; i++) {
2683 s = mdsc->sessions[i];
2684 if (!s)
2685 continue;
2686 if (!ceph_mdsmap_is_laggy(newmap, i))
2687 continue;
2688 if (s->s_state == CEPH_MDS_SESSION_OPEN ||
2689 s->s_state == CEPH_MDS_SESSION_HUNG ||
2690 s->s_state == CEPH_MDS_SESSION_CLOSING) {
2691 dout(" connecting to export targets of laggy mds%d\n",
2692 i);
2693 __open_export_target_sessions(mdsc, s);
2694 }
2695 }
2696}
2697
2698
2699
2700/*
2701 * leases
2702 */
2703
2704/*
2705 * caller must hold session s_mutex, dentry->d_lock
2706 */
2707void __ceph_mdsc_drop_dentry_lease(struct dentry *dentry)
2708{
2709 struct ceph_dentry_info *di = ceph_dentry(dentry);
2710
2711 ceph_put_mds_session(di->lease_session);
2712 di->lease_session = NULL;
2713}
2714
2715static void handle_lease(struct ceph_mds_client *mdsc,
2716 struct ceph_mds_session *session,
2717 struct ceph_msg *msg)
2718{
2719 struct super_block *sb = mdsc->fsc->sb;
2720 struct inode *inode;
2721 struct dentry *parent, *dentry;
2722 struct ceph_dentry_info *di;
2723 int mds = session->s_mds;
2724 struct ceph_mds_lease *h = msg->front.iov_base;
2725 u32 seq;
2726 struct ceph_vino vino;
2727 struct qstr dname;
2728 int release = 0;
2729
2730 dout("handle_lease from mds%d\n", mds);
2731
2732 /* decode */
2733 if (msg->front.iov_len < sizeof(*h) + sizeof(u32))
2734 goto bad;
2735 vino.ino = le64_to_cpu(h->ino);
2736 vino.snap = CEPH_NOSNAP;
2737 seq = le32_to_cpu(h->seq);
2738 dname.name = (void *)h + sizeof(*h) + sizeof(u32);
2739 dname.len = msg->front.iov_len - sizeof(*h) - sizeof(u32);
2740 if (dname.len != get_unaligned_le32(h+1))
2741 goto bad;
2742
2743 mutex_lock(&session->s_mutex);
2744 session->s_seq++;
2745
2746 /* lookup inode */
2747 inode = ceph_find_inode(sb, vino);
2748 dout("handle_lease %s, ino %llx %p %.*s\n",
2749 ceph_lease_op_name(h->action), vino.ino, inode,
2750 dname.len, dname.name);
2751 if (inode == NULL) {
2752 dout("handle_lease no inode %llx\n", vino.ino);
2753 goto release;
2754 }
2755
2756 /* dentry */
2757 parent = d_find_alias(inode);
2758 if (!parent) {
2759 dout("no parent dentry on inode %p\n", inode);
2760 WARN_ON(1);
2761 goto release; /* hrm... */
2762 }
2763 dname.hash = full_name_hash(dname.name, dname.len);
2764 dentry = d_lookup(parent, &dname);
2765 dput(parent);
2766 if (!dentry)
2767 goto release;
2768
2769 spin_lock(&dentry->d_lock);
2770 di = ceph_dentry(dentry);
2771 switch (h->action) {
2772 case CEPH_MDS_LEASE_REVOKE:
2773 if (di && di->lease_session == session) {
2774 if (ceph_seq_cmp(di->lease_seq, seq) > 0)
2775 h->seq = cpu_to_le32(di->lease_seq);
2776 __ceph_mdsc_drop_dentry_lease(dentry);
2777 }
2778 release = 1;
2779 break;
2780
2781 case CEPH_MDS_LEASE_RENEW:
2782 if (di && di->lease_session == session &&
2783 di->lease_gen == session->s_cap_gen &&
2784 di->lease_renew_from &&
2785 di->lease_renew_after == 0) {
2786 unsigned long duration =
2787 le32_to_cpu(h->duration_ms) * HZ / 1000;
2788
2789 di->lease_seq = seq;
2790 dentry->d_time = di->lease_renew_from + duration;
2791 di->lease_renew_after = di->lease_renew_from +
2792 (duration >> 1);
2793 di->lease_renew_from = 0;
2794 }
2795 break;
2796 }
2797 spin_unlock(&dentry->d_lock);
2798 dput(dentry);
2799
2800 if (!release)
2801 goto out;
2802
2803release:
2804 /* let's just reuse the same message */
2805 h->action = CEPH_MDS_LEASE_REVOKE_ACK;
2806 ceph_msg_get(msg);
2807 ceph_con_send(&session->s_con, msg);
2808
2809out:
2810 iput(inode);
2811 mutex_unlock(&session->s_mutex);
2812 return;
2813
2814bad:
2815 pr_err("corrupt lease message\n");
2816 ceph_msg_dump(msg);
2817}
2818
2819void ceph_mdsc_lease_send_msg(struct ceph_mds_session *session,
2820 struct inode *inode,
2821 struct dentry *dentry, char action,
2822 u32 seq)
2823{
2824 struct ceph_msg *msg;
2825 struct ceph_mds_lease *lease;
2826 int len = sizeof(*lease) + sizeof(u32);
2827 int dnamelen = 0;
2828
2829 dout("lease_send_msg inode %p dentry %p %s to mds%d\n",
2830 inode, dentry, ceph_lease_op_name(action), session->s_mds);
2831 dnamelen = dentry->d_name.len;
2832 len += dnamelen;
2833
2834 msg = ceph_msg_new(CEPH_MSG_CLIENT_LEASE, len, GFP_NOFS);
2835 if (!msg)
2836 return;
2837 lease = msg->front.iov_base;
2838 lease->action = action;
2839 lease->ino = cpu_to_le64(ceph_vino(inode).ino);
2840 lease->first = lease->last = cpu_to_le64(ceph_vino(inode).snap);
2841 lease->seq = cpu_to_le32(seq);
2842 put_unaligned_le32(dnamelen, lease + 1);
2843 memcpy((void *)(lease + 1) + 4, dentry->d_name.name, dnamelen);
2844
2845 /*
2846 * if this is a preemptive lease RELEASE, no need to
2847 * flush request stream, since the actual request will
2848 * soon follow.
2849 */
2850 msg->more_to_follow = (action == CEPH_MDS_LEASE_RELEASE);
2851
2852 ceph_con_send(&session->s_con, msg);
2853}
2854
2855/*
2856 * Preemptively release a lease we expect to invalidate anyway.
2857 * Pass @inode always, @dentry is optional.
2858 */
2859void ceph_mdsc_lease_release(struct ceph_mds_client *mdsc, struct inode *inode,
2860 struct dentry *dentry)
2861{
2862 struct ceph_dentry_info *di;
2863 struct ceph_mds_session *session;
2864 u32 seq;
2865
2866 BUG_ON(inode == NULL);
2867 BUG_ON(dentry == NULL);
2868
2869 /* is dentry lease valid? */
2870 spin_lock(&dentry->d_lock);
2871 di = ceph_dentry(dentry);
2872 if (!di || !di->lease_session ||
2873 di->lease_session->s_mds < 0 ||
2874 di->lease_gen != di->lease_session->s_cap_gen ||
2875 !time_before(jiffies, dentry->d_time)) {
2876 dout("lease_release inode %p dentry %p -- "
2877 "no lease\n",
2878 inode, dentry);
2879 spin_unlock(&dentry->d_lock);
2880 return;
2881 }
2882
2883 /* we do have a lease on this dentry; note mds and seq */
2884 session = ceph_get_mds_session(di->lease_session);
2885 seq = di->lease_seq;
2886 __ceph_mdsc_drop_dentry_lease(dentry);
2887 spin_unlock(&dentry->d_lock);
2888
2889 dout("lease_release inode %p dentry %p to mds%d\n",
2890 inode, dentry, session->s_mds);
2891 ceph_mdsc_lease_send_msg(session, inode, dentry,
2892 CEPH_MDS_LEASE_RELEASE, seq);
2893 ceph_put_mds_session(session);
2894}
2895
2896/*
2897 * drop all leases (and dentry refs) in preparation for umount
2898 */
2899static void drop_leases(struct ceph_mds_client *mdsc)
2900{
2901 int i;
2902
2903 dout("drop_leases\n");
2904 mutex_lock(&mdsc->mutex);
2905 for (i = 0; i < mdsc->max_sessions; i++) {
2906 struct ceph_mds_session *s = __ceph_lookup_mds_session(mdsc, i);
2907 if (!s)
2908 continue;
2909 mutex_unlock(&mdsc->mutex);
2910 mutex_lock(&s->s_mutex);
2911 mutex_unlock(&s->s_mutex);
2912 ceph_put_mds_session(s);
2913 mutex_lock(&mdsc->mutex);
2914 }
2915 mutex_unlock(&mdsc->mutex);
2916}
2917
2918
2919
2920/*
2921 * delayed work -- periodically trim expired leases, renew caps with mds
2922 */
2923static void schedule_delayed(struct ceph_mds_client *mdsc)
2924{
2925 int delay = 5;
2926 unsigned hz = round_jiffies_relative(HZ * delay);
2927 schedule_delayed_work(&mdsc->delayed_work, hz);
2928}
2929
2930static void delayed_work(struct work_struct *work)
2931{
2932 int i;
2933 struct ceph_mds_client *mdsc =
2934 container_of(work, struct ceph_mds_client, delayed_work.work);
2935 int renew_interval;
2936 int renew_caps;
2937
2938 dout("mdsc delayed_work\n");
2939 ceph_check_delayed_caps(mdsc);
2940
2941 mutex_lock(&mdsc->mutex);
2942 renew_interval = mdsc->mdsmap->m_session_timeout >> 2;
2943 renew_caps = time_after_eq(jiffies, HZ*renew_interval +
2944 mdsc->last_renew_caps);
2945 if (renew_caps)
2946 mdsc->last_renew_caps = jiffies;
2947
2948 for (i = 0; i < mdsc->max_sessions; i++) {
2949 struct ceph_mds_session *s = __ceph_lookup_mds_session(mdsc, i);
2950 if (s == NULL)
2951 continue;
2952 if (s->s_state == CEPH_MDS_SESSION_CLOSING) {
2953 dout("resending session close request for mds%d\n",
2954 s->s_mds);
2955 request_close_session(mdsc, s);
2956 ceph_put_mds_session(s);
2957 continue;
2958 }
2959 if (s->s_ttl && time_after(jiffies, s->s_ttl)) {
2960 if (s->s_state == CEPH_MDS_SESSION_OPEN) {
2961 s->s_state = CEPH_MDS_SESSION_HUNG;
2962 pr_info("mds%d hung\n", s->s_mds);
2963 }
2964 }
2965 if (s->s_state < CEPH_MDS_SESSION_OPEN) {
2966 /* this mds is failed or recovering, just wait */
2967 ceph_put_mds_session(s);
2968 continue;
2969 }
2970 mutex_unlock(&mdsc->mutex);
2971
2972 mutex_lock(&s->s_mutex);
2973 if (renew_caps)
2974 send_renew_caps(mdsc, s);
2975 else
2976 ceph_con_keepalive(&s->s_con);
2977 ceph_add_cap_releases(mdsc, s);
2978 if (s->s_state == CEPH_MDS_SESSION_OPEN ||
2979 s->s_state == CEPH_MDS_SESSION_HUNG)
2980 ceph_send_cap_releases(mdsc, s);
2981 mutex_unlock(&s->s_mutex);
2982 ceph_put_mds_session(s);
2983
2984 mutex_lock(&mdsc->mutex);
2985 }
2986 mutex_unlock(&mdsc->mutex);
2987
2988 schedule_delayed(mdsc);
2989}
2990
2991int ceph_mdsc_init(struct ceph_fs_client *fsc)
2992
2993{
2994 struct ceph_mds_client *mdsc;
2995
2996 mdsc = kzalloc(sizeof(struct ceph_mds_client), GFP_NOFS);
2997 if (!mdsc)
2998 return -ENOMEM;
2999 mdsc->fsc = fsc;
3000 fsc->mdsc = mdsc;
3001 mutex_init(&mdsc->mutex);
3002 mdsc->mdsmap = kzalloc(sizeof(*mdsc->mdsmap), GFP_NOFS);
3003 if (mdsc->mdsmap == NULL)
3004 return -ENOMEM;
3005
3006 init_completion(&mdsc->safe_umount_waiters);
3007 init_waitqueue_head(&mdsc->session_close_wq);
3008 INIT_LIST_HEAD(&mdsc->waiting_for_map);
3009 mdsc->sessions = NULL;
3010 mdsc->max_sessions = 0;
3011 mdsc->stopping = 0;
3012 init_rwsem(&mdsc->snap_rwsem);
3013 mdsc->snap_realms = RB_ROOT;
3014 INIT_LIST_HEAD(&mdsc->snap_empty);
3015 spin_lock_init(&mdsc->snap_empty_lock);
3016 mdsc->last_tid = 0;
3017 mdsc->request_tree = RB_ROOT;
3018 INIT_DELAYED_WORK(&mdsc->delayed_work, delayed_work);
3019 mdsc->last_renew_caps = jiffies;
3020 INIT_LIST_HEAD(&mdsc->cap_delay_list);
3021 spin_lock_init(&mdsc->cap_delay_lock);
3022 INIT_LIST_HEAD(&mdsc->snap_flush_list);
3023 spin_lock_init(&mdsc->snap_flush_lock);
3024 mdsc->cap_flush_seq = 0;
3025 INIT_LIST_HEAD(&mdsc->cap_dirty);
3026 INIT_LIST_HEAD(&mdsc->cap_dirty_migrating);
3027 mdsc->num_cap_flushing = 0;
3028 spin_lock_init(&mdsc->cap_dirty_lock);
3029 init_waitqueue_head(&mdsc->cap_flushing_wq);
3030 spin_lock_init(&mdsc->dentry_lru_lock);
3031 INIT_LIST_HEAD(&mdsc->dentry_lru);
3032
3033 ceph_caps_init(mdsc);
3034 ceph_adjust_min_caps(mdsc, fsc->min_caps);
3035
3036 return 0;
3037}
3038
3039/*
3040 * Wait for safe replies on open mds requests. If we time out, drop
3041 * all requests from the tree to avoid dangling dentry refs.
3042 */
3043static void wait_requests(struct ceph_mds_client *mdsc)
3044{
3045 struct ceph_mds_request *req;
3046 struct ceph_fs_client *fsc = mdsc->fsc;
3047
3048 mutex_lock(&mdsc->mutex);
3049 if (__get_oldest_req(mdsc)) {
3050 mutex_unlock(&mdsc->mutex);
3051
3052 dout("wait_requests waiting for requests\n");
3053 wait_for_completion_timeout(&mdsc->safe_umount_waiters,
3054 fsc->client->options->mount_timeout * HZ);
3055
3056 /* tear down remaining requests */
3057 mutex_lock(&mdsc->mutex);
3058 while ((req = __get_oldest_req(mdsc))) {
3059 dout("wait_requests timed out on tid %llu\n",
3060 req->r_tid);
3061 __unregister_request(mdsc, req);
3062 }
3063 }
3064 mutex_unlock(&mdsc->mutex);
3065 dout("wait_requests done\n");
3066}
3067
3068/*
3069 * called before mount is ro, and before dentries are torn down.
3070 * (hmm, does this still race with new lookups?)
3071 */
3072void ceph_mdsc_pre_umount(struct ceph_mds_client *mdsc)
3073{
3074 dout("pre_umount\n");
3075 mdsc->stopping = 1;
3076
3077 drop_leases(mdsc);
3078 ceph_flush_dirty_caps(mdsc);
3079 wait_requests(mdsc);
3080
3081 /*
3082 * wait for reply handlers to drop their request refs and
3083 * their inode/dcache refs
3084 */
3085 ceph_msgr_flush();
3086}
3087
3088/*
3089 * wait for all write mds requests to flush.
3090 */
3091static void wait_unsafe_requests(struct ceph_mds_client *mdsc, u64 want_tid)
3092{
3093 struct ceph_mds_request *req = NULL, *nextreq;
3094 struct rb_node *n;
3095
3096 mutex_lock(&mdsc->mutex);
3097 dout("wait_unsafe_requests want %lld\n", want_tid);
3098restart:
3099 req = __get_oldest_req(mdsc);
3100 while (req && req->r_tid <= want_tid) {
3101 /* find next request */
3102 n = rb_next(&req->r_node);
3103 if (n)
3104 nextreq = rb_entry(n, struct ceph_mds_request, r_node);
3105 else
3106 nextreq = NULL;
3107 if ((req->r_op & CEPH_MDS_OP_WRITE)) {
3108 /* write op */
3109 ceph_mdsc_get_request(req);
3110 if (nextreq)
3111 ceph_mdsc_get_request(nextreq);
3112 mutex_unlock(&mdsc->mutex);
3113 dout("wait_unsafe_requests wait on %llu (want %llu)\n",
3114 req->r_tid, want_tid);
3115 wait_for_completion(&req->r_safe_completion);
3116 mutex_lock(&mdsc->mutex);
3117 ceph_mdsc_put_request(req);
3118 if (!nextreq)
3119 break; /* next dne before, so we're done! */
3120 if (RB_EMPTY_NODE(&nextreq->r_node)) {
3121 /* next request was removed from tree */
3122 ceph_mdsc_put_request(nextreq);
3123 goto restart;
3124 }
3125 ceph_mdsc_put_request(nextreq); /* won't go away */
3126 }
3127 req = nextreq;
3128 }
3129 mutex_unlock(&mdsc->mutex);
3130 dout("wait_unsafe_requests done\n");
3131}
3132
3133void ceph_mdsc_sync(struct ceph_mds_client *mdsc)
3134{
3135 u64 want_tid, want_flush;
3136
3137 if (mdsc->fsc->mount_state == CEPH_MOUNT_SHUTDOWN)
3138 return;
3139
3140 dout("sync\n");
3141 mutex_lock(&mdsc->mutex);
3142 want_tid = mdsc->last_tid;
3143 want_flush = mdsc->cap_flush_seq;
3144 mutex_unlock(&mdsc->mutex);
3145 dout("sync want tid %lld flush_seq %lld\n", want_tid, want_flush);
3146
3147 ceph_flush_dirty_caps(mdsc);
3148
3149 wait_unsafe_requests(mdsc, want_tid);
3150 wait_event(mdsc->cap_flushing_wq, check_cap_flush(mdsc, want_flush));
3151}
3152
3153/*
3154 * true if all sessions are closed, or we force unmount
3155 */
3156bool done_closing_sessions(struct ceph_mds_client *mdsc)
3157{
3158 int i, n = 0;
3159
3160 if (mdsc->fsc->mount_state == CEPH_MOUNT_SHUTDOWN)
3161 return true;
3162
3163 mutex_lock(&mdsc->mutex);
3164 for (i = 0; i < mdsc->max_sessions; i++)
3165 if (mdsc->sessions[i])
3166 n++;
3167 mutex_unlock(&mdsc->mutex);
3168 return n == 0;
3169}
3170
3171/*
3172 * called after sb is ro.
3173 */
3174void ceph_mdsc_close_sessions(struct ceph_mds_client *mdsc)
3175{
3176 struct ceph_mds_session *session;
3177 int i;
3178 struct ceph_fs_client *fsc = mdsc->fsc;
3179 unsigned long timeout = fsc->client->options->mount_timeout * HZ;
3180
3181 dout("close_sessions\n");
3182
3183 /* close sessions */
3184 mutex_lock(&mdsc->mutex);
3185 for (i = 0; i < mdsc->max_sessions; i++) {
3186 session = __ceph_lookup_mds_session(mdsc, i);
3187 if (!session)
3188 continue;
3189 mutex_unlock(&mdsc->mutex);
3190 mutex_lock(&session->s_mutex);
3191 __close_session(mdsc, session);
3192 mutex_unlock(&session->s_mutex);
3193 ceph_put_mds_session(session);
3194 mutex_lock(&mdsc->mutex);
3195 }
3196 mutex_unlock(&mdsc->mutex);
3197
3198 dout("waiting for sessions to close\n");
3199 wait_event_timeout(mdsc->session_close_wq, done_closing_sessions(mdsc),
3200 timeout);
3201
3202 /* tear down remaining sessions */
3203 mutex_lock(&mdsc->mutex);
3204 for (i = 0; i < mdsc->max_sessions; i++) {
3205 if (mdsc->sessions[i]) {
3206 session = get_session(mdsc->sessions[i]);
3207 __unregister_session(mdsc, session);
3208 mutex_unlock(&mdsc->mutex);
3209 mutex_lock(&session->s_mutex);
3210 remove_session_caps(session);
3211 mutex_unlock(&session->s_mutex);
3212 ceph_put_mds_session(session);
3213 mutex_lock(&mdsc->mutex);
3214 }
3215 }
3216 WARN_ON(!list_empty(&mdsc->cap_delay_list));
3217 mutex_unlock(&mdsc->mutex);
3218
3219 ceph_cleanup_empty_realms(mdsc);
3220
3221 cancel_delayed_work_sync(&mdsc->delayed_work); /* cancel timer */
3222
3223 dout("stopped\n");
3224}
3225
3226static void ceph_mdsc_stop(struct ceph_mds_client *mdsc)
3227{
3228 dout("stop\n");
3229 cancel_delayed_work_sync(&mdsc->delayed_work); /* cancel timer */
3230 if (mdsc->mdsmap)
3231 ceph_mdsmap_destroy(mdsc->mdsmap);
3232 kfree(mdsc->sessions);
3233 ceph_caps_finalize(mdsc);
3234}
3235
3236void ceph_mdsc_destroy(struct ceph_fs_client *fsc)
3237{
3238 struct ceph_mds_client *mdsc = fsc->mdsc;
3239
3240 dout("mdsc_destroy %p\n", mdsc);
3241 ceph_mdsc_stop(mdsc);
3242
3243 /* flush out any connection work with references to us */
3244 ceph_msgr_flush();
3245
3246 fsc->mdsc = NULL;
3247 kfree(mdsc);
3248 dout("mdsc_destroy %p done\n", mdsc);
3249}
3250
3251
3252/*
3253 * handle mds map update.
3254 */
3255void ceph_mdsc_handle_map(struct ceph_mds_client *mdsc, struct ceph_msg *msg)
3256{
3257 u32 epoch;
3258 u32 maplen;
3259 void *p = msg->front.iov_base;
3260 void *end = p + msg->front.iov_len;
3261 struct ceph_mdsmap *newmap, *oldmap;
3262 struct ceph_fsid fsid;
3263 int err = -EINVAL;
3264
3265 ceph_decode_need(&p, end, sizeof(fsid)+2*sizeof(u32), bad);
3266 ceph_decode_copy(&p, &fsid, sizeof(fsid));
3267 if (ceph_check_fsid(mdsc->fsc->client, &fsid) < 0)
3268 return;
3269 epoch = ceph_decode_32(&p);
3270 maplen = ceph_decode_32(&p);
3271 dout("handle_map epoch %u len %d\n", epoch, (int)maplen);
3272
3273 /* do we need it? */
3274 ceph_monc_got_mdsmap(&mdsc->fsc->client->monc, epoch);
3275 mutex_lock(&mdsc->mutex);
3276 if (mdsc->mdsmap && epoch <= mdsc->mdsmap->m_epoch) {
3277 dout("handle_map epoch %u <= our %u\n",
3278 epoch, mdsc->mdsmap->m_epoch);
3279 mutex_unlock(&mdsc->mutex);
3280 return;
3281 }
3282
3283 newmap = ceph_mdsmap_decode(&p, end);
3284 if (IS_ERR(newmap)) {
3285 err = PTR_ERR(newmap);
3286 goto bad_unlock;
3287 }
3288
3289 /* swap into place */
3290 if (mdsc->mdsmap) {
3291 oldmap = mdsc->mdsmap;
3292 mdsc->mdsmap = newmap;
3293 check_new_map(mdsc, newmap, oldmap);
3294 ceph_mdsmap_destroy(oldmap);
3295 } else {
3296 mdsc->mdsmap = newmap; /* first mds map */
3297 }
3298 mdsc->fsc->sb->s_maxbytes = mdsc->mdsmap->m_max_file_size;
3299
3300 __wake_requests(mdsc, &mdsc->waiting_for_map);
3301
3302 mutex_unlock(&mdsc->mutex);
3303 schedule_delayed(mdsc);
3304 return;
3305
3306bad_unlock:
3307 mutex_unlock(&mdsc->mutex);
3308bad:
3309 pr_err("error decoding mdsmap %d\n", err);
3310 return;
3311}
3312
3313static struct ceph_connection *con_get(struct ceph_connection *con)
3314{
3315 struct ceph_mds_session *s = con->private;
3316
3317 if (get_session(s)) {
3318 dout("mdsc con_get %p ok (%d)\n", s, atomic_read(&s->s_ref));
3319 return con;
3320 }
3321 dout("mdsc con_get %p FAIL\n", s);
3322 return NULL;
3323}
3324
3325static void con_put(struct ceph_connection *con)
3326{
3327 struct ceph_mds_session *s = con->private;
3328
3329 dout("mdsc con_put %p (%d)\n", s, atomic_read(&s->s_ref) - 1);
3330 ceph_put_mds_session(s);
3331}
3332
3333/*
3334 * if the client is unresponsive for long enough, the mds will kill
3335 * the session entirely.
3336 */
3337static void peer_reset(struct ceph_connection *con)
3338{
3339 struct ceph_mds_session *s = con->private;
3340 struct ceph_mds_client *mdsc = s->s_mdsc;
3341
3342 pr_warning("mds%d closed our session\n", s->s_mds);
3343 send_mds_reconnect(mdsc, s);
3344}
3345
3346static void dispatch(struct ceph_connection *con, struct ceph_msg *msg)
3347{
3348 struct ceph_mds_session *s = con->private;
3349 struct ceph_mds_client *mdsc = s->s_mdsc;
3350 int type = le16_to_cpu(msg->hdr.type);
3351
3352 mutex_lock(&mdsc->mutex);
3353 if (__verify_registered_session(mdsc, s) < 0) {
3354 mutex_unlock(&mdsc->mutex);
3355 goto out;
3356 }
3357 mutex_unlock(&mdsc->mutex);
3358
3359 switch (type) {
3360 case CEPH_MSG_MDS_MAP:
3361 ceph_mdsc_handle_map(mdsc, msg);
3362 break;
3363 case CEPH_MSG_CLIENT_SESSION:
3364 handle_session(s, msg);
3365 break;
3366 case CEPH_MSG_CLIENT_REPLY:
3367 handle_reply(s, msg);
3368 break;
3369 case CEPH_MSG_CLIENT_REQUEST_FORWARD:
3370 handle_forward(mdsc, s, msg);
3371 break;
3372 case CEPH_MSG_CLIENT_CAPS:
3373 ceph_handle_caps(s, msg);
3374 break;
3375 case CEPH_MSG_CLIENT_SNAP:
3376 ceph_handle_snap(mdsc, s, msg);
3377 break;
3378 case CEPH_MSG_CLIENT_LEASE:
3379 handle_lease(mdsc, s, msg);
3380 break;
3381
3382 default:
3383 pr_err("received unknown message type %d %s\n", type,
3384 ceph_msg_type_name(type));
3385 }
3386out:
3387 ceph_msg_put(msg);
3388}
3389
3390/*
3391 * authentication
3392 */
3393static int get_authorizer(struct ceph_connection *con,
3394 void **buf, int *len, int *proto,
3395 void **reply_buf, int *reply_len, int force_new)
3396{
3397 struct ceph_mds_session *s = con->private;
3398 struct ceph_mds_client *mdsc = s->s_mdsc;
3399 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
3400 int ret = 0;
3401
3402 if (force_new && s->s_authorizer) {
3403 ac->ops->destroy_authorizer(ac, s->s_authorizer);
3404 s->s_authorizer = NULL;
3405 }
3406 if (s->s_authorizer == NULL) {
3407 if (ac->ops->create_authorizer) {
3408 ret = ac->ops->create_authorizer(
3409 ac, CEPH_ENTITY_TYPE_MDS,
3410 &s->s_authorizer,
3411 &s->s_authorizer_buf,
3412 &s->s_authorizer_buf_len,
3413 &s->s_authorizer_reply_buf,
3414 &s->s_authorizer_reply_buf_len);
3415 if (ret)
3416 return ret;
3417 }
3418 }
3419
3420 *proto = ac->protocol;
3421 *buf = s->s_authorizer_buf;
3422 *len = s->s_authorizer_buf_len;
3423 *reply_buf = s->s_authorizer_reply_buf;
3424 *reply_len = s->s_authorizer_reply_buf_len;
3425 return 0;
3426}
3427
3428
3429static int verify_authorizer_reply(struct ceph_connection *con, int len)
3430{
3431 struct ceph_mds_session *s = con->private;
3432 struct ceph_mds_client *mdsc = s->s_mdsc;
3433 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
3434
3435 return ac->ops->verify_authorizer_reply(ac, s->s_authorizer, len);
3436}
3437
3438static int invalidate_authorizer(struct ceph_connection *con)
3439{
3440 struct ceph_mds_session *s = con->private;
3441 struct ceph_mds_client *mdsc = s->s_mdsc;
3442 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
3443
3444 if (ac->ops->invalidate_authorizer)
3445 ac->ops->invalidate_authorizer(ac, CEPH_ENTITY_TYPE_MDS);
3446
3447 return ceph_monc_validate_auth(&mdsc->fsc->client->monc);
3448}
3449
3450static const struct ceph_connection_operations mds_con_ops = {
3451 .get = con_get,
3452 .put = con_put,
3453 .dispatch = dispatch,
3454 .get_authorizer = get_authorizer,
3455 .verify_authorizer_reply = verify_authorizer_reply,
3456 .invalidate_authorizer = invalidate_authorizer,
3457 .peer_reset = peer_reset,
3458};
3459
3460/* eof */