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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50 * are no longer valid.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 ceph_decode_need(&p, end, len, bad);
266 err = parse_reply_info_trace(&p, p+len, info, features);
267 if (err < 0)
268 goto out_bad;
269 }
270
271 /* extra */
272 ceph_decode_32_safe(&p, end, len, bad);
273 if (len > 0) {
274 ceph_decode_need(&p, end, len, bad);
275 err = parse_reply_info_extra(&p, p+len, info, features);
276 if (err < 0)
277 goto out_bad;
278 }
279
280 /* snap blob */
281 ceph_decode_32_safe(&p, end, len, bad);
282 info->snapblob_len = len;
283 info->snapblob = p;
284 p += len;
285
286 if (p != end)
287 goto bad;
288 return 0;
289
290bad:
291 err = -EIO;
292out_bad:
293 pr_err("mds parse_reply err %d\n", err);
294 return err;
295}
296
297static void destroy_reply_info(struct ceph_mds_reply_info_parsed *info)
298{
299 kfree(info->dir_in);
300}
301
302
303/*
304 * sessions
305 */
306static const char *session_state_name(int s)
307{
308 switch (s) {
309 case CEPH_MDS_SESSION_NEW: return "new";
310 case CEPH_MDS_SESSION_OPENING: return "opening";
311 case CEPH_MDS_SESSION_OPEN: return "open";
312 case CEPH_MDS_SESSION_HUNG: return "hung";
313 case CEPH_MDS_SESSION_CLOSING: return "closing";
314 case CEPH_MDS_SESSION_RESTARTING: return "restarting";
315 case CEPH_MDS_SESSION_RECONNECTING: return "reconnecting";
316 default: return "???";
317 }
318}
319
320static struct ceph_mds_session *get_session(struct ceph_mds_session *s)
321{
322 if (atomic_inc_not_zero(&s->s_ref)) {
323 dout("mdsc get_session %p %d -> %d\n", s,
324 atomic_read(&s->s_ref)-1, atomic_read(&s->s_ref));
325 return s;
326 } else {
327 dout("mdsc get_session %p 0 -- FAIL", s);
328 return NULL;
329 }
330}
331
332void ceph_put_mds_session(struct ceph_mds_session *s)
333{
334 dout("mdsc put_session %p %d -> %d\n", s,
335 atomic_read(&s->s_ref), atomic_read(&s->s_ref)-1);
336 if (atomic_dec_and_test(&s->s_ref)) {
337 if (s->s_auth.authorizer)
338 s->s_mdsc->fsc->client->monc.auth->ops->destroy_authorizer(
339 s->s_mdsc->fsc->client->monc.auth,
340 s->s_auth.authorizer);
341 kfree(s);
342 }
343}
344
345/*
346 * called under mdsc->mutex
347 */
348struct ceph_mds_session *__ceph_lookup_mds_session(struct ceph_mds_client *mdsc,
349 int mds)
350{
351 struct ceph_mds_session *session;
352
353 if (mds >= mdsc->max_sessions || mdsc->sessions[mds] == NULL)
354 return NULL;
355 session = mdsc->sessions[mds];
356 dout("lookup_mds_session %p %d\n", session,
357 atomic_read(&session->s_ref));
358 get_session(session);
359 return session;
360}
361
362static bool __have_session(struct ceph_mds_client *mdsc, int mds)
363{
364 if (mds >= mdsc->max_sessions)
365 return false;
366 return mdsc->sessions[mds];
367}
368
369static int __verify_registered_session(struct ceph_mds_client *mdsc,
370 struct ceph_mds_session *s)
371{
372 if (s->s_mds >= mdsc->max_sessions ||
373 mdsc->sessions[s->s_mds] != s)
374 return -ENOENT;
375 return 0;
376}
377
378/*
379 * create+register a new session for given mds.
380 * called under mdsc->mutex.
381 */
382static struct ceph_mds_session *register_session(struct ceph_mds_client *mdsc,
383 int mds)
384{
385 struct ceph_mds_session *s;
386
387 s = kzalloc(sizeof(*s), GFP_NOFS);
388 if (!s)
389 return ERR_PTR(-ENOMEM);
390 s->s_mdsc = mdsc;
391 s->s_mds = mds;
392 s->s_state = CEPH_MDS_SESSION_NEW;
393 s->s_ttl = 0;
394 s->s_seq = 0;
395 mutex_init(&s->s_mutex);
396
397 ceph_con_init(mdsc->fsc->client->msgr, &s->s_con);
398 s->s_con.private = s;
399 s->s_con.ops = &mds_con_ops;
400 s->s_con.peer_name.type = CEPH_ENTITY_TYPE_MDS;
401 s->s_con.peer_name.num = cpu_to_le64(mds);
402
403 spin_lock_init(&s->s_gen_ttl_lock);
404 s->s_cap_gen = 0;
405 s->s_cap_ttl = jiffies - 1;
406
407 spin_lock_init(&s->s_cap_lock);
408 s->s_renew_requested = 0;
409 s->s_renew_seq = 0;
410 INIT_LIST_HEAD(&s->s_caps);
411 s->s_nr_caps = 0;
412 s->s_trim_caps = 0;
413 atomic_set(&s->s_ref, 1);
414 INIT_LIST_HEAD(&s->s_waiting);
415 INIT_LIST_HEAD(&s->s_unsafe);
416 s->s_num_cap_releases = 0;
417 s->s_cap_iterator = NULL;
418 INIT_LIST_HEAD(&s->s_cap_releases);
419 INIT_LIST_HEAD(&s->s_cap_releases_done);
420 INIT_LIST_HEAD(&s->s_cap_flushing);
421 INIT_LIST_HEAD(&s->s_cap_snaps_flushing);
422
423 dout("register_session mds%d\n", mds);
424 if (mds >= mdsc->max_sessions) {
425 int newmax = 1 << get_count_order(mds+1);
426 struct ceph_mds_session **sa;
427
428 dout("register_session realloc to %d\n", newmax);
429 sa = kcalloc(newmax, sizeof(void *), GFP_NOFS);
430 if (sa == NULL)
431 goto fail_realloc;
432 if (mdsc->sessions) {
433 memcpy(sa, mdsc->sessions,
434 mdsc->max_sessions * sizeof(void *));
435 kfree(mdsc->sessions);
436 }
437 mdsc->sessions = sa;
438 mdsc->max_sessions = newmax;
439 }
440 mdsc->sessions[mds] = s;
441 atomic_inc(&s->s_ref); /* one ref to sessions[], one to caller */
442
443 ceph_con_open(&s->s_con, ceph_mdsmap_get_addr(mdsc->mdsmap, mds));
444
445 return s;
446
447fail_realloc:
448 kfree(s);
449 return ERR_PTR(-ENOMEM);
450}
451
452/*
453 * called under mdsc->mutex
454 */
455static void __unregister_session(struct ceph_mds_client *mdsc,
456 struct ceph_mds_session *s)
457{
458 dout("__unregister_session mds%d %p\n", s->s_mds, s);
459 BUG_ON(mdsc->sessions[s->s_mds] != s);
460 mdsc->sessions[s->s_mds] = NULL;
461 ceph_con_close(&s->s_con);
462 ceph_put_mds_session(s);
463}
464
465/*
466 * drop session refs in request.
467 *
468 * should be last request ref, or hold mdsc->mutex
469 */
470static void put_request_session(struct ceph_mds_request *req)
471{
472 if (req->r_session) {
473 ceph_put_mds_session(req->r_session);
474 req->r_session = NULL;
475 }
476}
477
478void ceph_mdsc_release_request(struct kref *kref)
479{
480 struct ceph_mds_request *req = container_of(kref,
481 struct ceph_mds_request,
482 r_kref);
483 if (req->r_request)
484 ceph_msg_put(req->r_request);
485 if (req->r_reply) {
486 ceph_msg_put(req->r_reply);
487 destroy_reply_info(&req->r_reply_info);
488 }
489 if (req->r_inode) {
490 ceph_put_cap_refs(ceph_inode(req->r_inode), CEPH_CAP_PIN);
491 iput(req->r_inode);
492 }
493 if (req->r_locked_dir)
494 ceph_put_cap_refs(ceph_inode(req->r_locked_dir), CEPH_CAP_PIN);
495 if (req->r_target_inode)
496 iput(req->r_target_inode);
497 if (req->r_dentry)
498 dput(req->r_dentry);
499 if (req->r_old_dentry) {
500 /*
501 * track (and drop pins for) r_old_dentry_dir
502 * separately, since r_old_dentry's d_parent may have
503 * changed between the dir mutex being dropped and
504 * this request being freed.
505 */
506 ceph_put_cap_refs(ceph_inode(req->r_old_dentry_dir),
507 CEPH_CAP_PIN);
508 dput(req->r_old_dentry);
509 iput(req->r_old_dentry_dir);
510 }
511 kfree(req->r_path1);
512 kfree(req->r_path2);
513 put_request_session(req);
514 ceph_unreserve_caps(req->r_mdsc, &req->r_caps_reservation);
515 kfree(req);
516}
517
518/*
519 * lookup session, bump ref if found.
520 *
521 * called under mdsc->mutex.
522 */
523static struct ceph_mds_request *__lookup_request(struct ceph_mds_client *mdsc,
524 u64 tid)
525{
526 struct ceph_mds_request *req;
527 struct rb_node *n = mdsc->request_tree.rb_node;
528
529 while (n) {
530 req = rb_entry(n, struct ceph_mds_request, r_node);
531 if (tid < req->r_tid)
532 n = n->rb_left;
533 else if (tid > req->r_tid)
534 n = n->rb_right;
535 else {
536 ceph_mdsc_get_request(req);
537 return req;
538 }
539 }
540 return NULL;
541}
542
543static void __insert_request(struct ceph_mds_client *mdsc,
544 struct ceph_mds_request *new)
545{
546 struct rb_node **p = &mdsc->request_tree.rb_node;
547 struct rb_node *parent = NULL;
548 struct ceph_mds_request *req = NULL;
549
550 while (*p) {
551 parent = *p;
552 req = rb_entry(parent, struct ceph_mds_request, r_node);
553 if (new->r_tid < req->r_tid)
554 p = &(*p)->rb_left;
555 else if (new->r_tid > req->r_tid)
556 p = &(*p)->rb_right;
557 else
558 BUG();
559 }
560
561 rb_link_node(&new->r_node, parent, p);
562 rb_insert_color(&new->r_node, &mdsc->request_tree);
563}
564
565/*
566 * Register an in-flight request, and assign a tid. Link to directory
567 * are modifying (if any).
568 *
569 * Called under mdsc->mutex.
570 */
571static void __register_request(struct ceph_mds_client *mdsc,
572 struct ceph_mds_request *req,
573 struct inode *dir)
574{
575 req->r_tid = ++mdsc->last_tid;
576 if (req->r_num_caps)
577 ceph_reserve_caps(mdsc, &req->r_caps_reservation,
578 req->r_num_caps);
579 dout("__register_request %p tid %lld\n", req, req->r_tid);
580 ceph_mdsc_get_request(req);
581 __insert_request(mdsc, req);
582
583 req->r_uid = current_fsuid();
584 req->r_gid = current_fsgid();
585
586 if (dir) {
587 struct ceph_inode_info *ci = ceph_inode(dir);
588
589 ihold(dir);
590 spin_lock(&ci->i_unsafe_lock);
591 req->r_unsafe_dir = dir;
592 list_add_tail(&req->r_unsafe_dir_item, &ci->i_unsafe_dirops);
593 spin_unlock(&ci->i_unsafe_lock);
594 }
595}
596
597static void __unregister_request(struct ceph_mds_client *mdsc,
598 struct ceph_mds_request *req)
599{
600 dout("__unregister_request %p tid %lld\n", req, req->r_tid);
601 rb_erase(&req->r_node, &mdsc->request_tree);
602 RB_CLEAR_NODE(&req->r_node);
603
604 if (req->r_unsafe_dir) {
605 struct ceph_inode_info *ci = ceph_inode(req->r_unsafe_dir);
606
607 spin_lock(&ci->i_unsafe_lock);
608 list_del_init(&req->r_unsafe_dir_item);
609 spin_unlock(&ci->i_unsafe_lock);
610
611 iput(req->r_unsafe_dir);
612 req->r_unsafe_dir = NULL;
613 }
614
615 ceph_mdsc_put_request(req);
616}
617
618/*
619 * Choose mds to send request to next. If there is a hint set in the
620 * request (e.g., due to a prior forward hint from the mds), use that.
621 * Otherwise, consult frag tree and/or caps to identify the
622 * appropriate mds. If all else fails, choose randomly.
623 *
624 * Called under mdsc->mutex.
625 */
626static struct dentry *get_nonsnap_parent(struct dentry *dentry)
627{
628 /*
629 * we don't need to worry about protecting the d_parent access
630 * here because we never renaming inside the snapped namespace
631 * except to resplice to another snapdir, and either the old or new
632 * result is a valid result.
633 */
634 while (!IS_ROOT(dentry) && ceph_snap(dentry->d_inode) != CEPH_NOSNAP)
635 dentry = dentry->d_parent;
636 return dentry;
637}
638
639static int __choose_mds(struct ceph_mds_client *mdsc,
640 struct ceph_mds_request *req)
641{
642 struct inode *inode;
643 struct ceph_inode_info *ci;
644 struct ceph_cap *cap;
645 int mode = req->r_direct_mode;
646 int mds = -1;
647 u32 hash = req->r_direct_hash;
648 bool is_hash = req->r_direct_is_hash;
649
650 /*
651 * is there a specific mds we should try? ignore hint if we have
652 * no session and the mds is not up (active or recovering).
653 */
654 if (req->r_resend_mds >= 0 &&
655 (__have_session(mdsc, req->r_resend_mds) ||
656 ceph_mdsmap_get_state(mdsc->mdsmap, req->r_resend_mds) > 0)) {
657 dout("choose_mds using resend_mds mds%d\n",
658 req->r_resend_mds);
659 return req->r_resend_mds;
660 }
661
662 if (mode == USE_RANDOM_MDS)
663 goto random;
664
665 inode = NULL;
666 if (req->r_inode) {
667 inode = req->r_inode;
668 } else if (req->r_dentry) {
669 /* ignore race with rename; old or new d_parent is okay */
670 struct dentry *parent = req->r_dentry->d_parent;
671 struct inode *dir = parent->d_inode;
672
673 if (dir->i_sb != mdsc->fsc->sb) {
674 /* not this fs! */
675 inode = req->r_dentry->d_inode;
676 } else if (ceph_snap(dir) != CEPH_NOSNAP) {
677 /* direct snapped/virtual snapdir requests
678 * based on parent dir inode */
679 struct dentry *dn = get_nonsnap_parent(parent);
680 inode = dn->d_inode;
681 dout("__choose_mds using nonsnap parent %p\n", inode);
682 } else if (req->r_dentry->d_inode) {
683 /* dentry target */
684 inode = req->r_dentry->d_inode;
685 } else {
686 /* dir + name */
687 inode = dir;
688 hash = ceph_dentry_hash(dir, req->r_dentry);
689 is_hash = true;
690 }
691 }
692
693 dout("__choose_mds %p is_hash=%d (%d) mode %d\n", inode, (int)is_hash,
694 (int)hash, mode);
695 if (!inode)
696 goto random;
697 ci = ceph_inode(inode);
698
699 if (is_hash && S_ISDIR(inode->i_mode)) {
700 struct ceph_inode_frag frag;
701 int found;
702
703 ceph_choose_frag(ci, hash, &frag, &found);
704 if (found) {
705 if (mode == USE_ANY_MDS && frag.ndist > 0) {
706 u8 r;
707
708 /* choose a random replica */
709 get_random_bytes(&r, 1);
710 r %= frag.ndist;
711 mds = frag.dist[r];
712 dout("choose_mds %p %llx.%llx "
713 "frag %u mds%d (%d/%d)\n",
714 inode, ceph_vinop(inode),
715 frag.frag, mds,
716 (int)r, frag.ndist);
717 if (ceph_mdsmap_get_state(mdsc->mdsmap, mds) >=
718 CEPH_MDS_STATE_ACTIVE)
719 return mds;
720 }
721
722 /* since this file/dir wasn't known to be
723 * replicated, then we want to look for the
724 * authoritative mds. */
725 mode = USE_AUTH_MDS;
726 if (frag.mds >= 0) {
727 /* choose auth mds */
728 mds = frag.mds;
729 dout("choose_mds %p %llx.%llx "
730 "frag %u mds%d (auth)\n",
731 inode, ceph_vinop(inode), frag.frag, mds);
732 if (ceph_mdsmap_get_state(mdsc->mdsmap, mds) >=
733 CEPH_MDS_STATE_ACTIVE)
734 return mds;
735 }
736 }
737 }
738
739 spin_lock(&ci->i_ceph_lock);
740 cap = NULL;
741 if (mode == USE_AUTH_MDS)
742 cap = ci->i_auth_cap;
743 if (!cap && !RB_EMPTY_ROOT(&ci->i_caps))
744 cap = rb_entry(rb_first(&ci->i_caps), struct ceph_cap, ci_node);
745 if (!cap) {
746 spin_unlock(&ci->i_ceph_lock);
747 goto random;
748 }
749 mds = cap->session->s_mds;
750 dout("choose_mds %p %llx.%llx mds%d (%scap %p)\n",
751 inode, ceph_vinop(inode), mds,
752 cap == ci->i_auth_cap ? "auth " : "", cap);
753 spin_unlock(&ci->i_ceph_lock);
754 return mds;
755
756random:
757 mds = ceph_mdsmap_get_random_mds(mdsc->mdsmap);
758 dout("choose_mds chose random mds%d\n", mds);
759 return mds;
760}
761
762
763/*
764 * session messages
765 */
766static struct ceph_msg *create_session_msg(u32 op, u64 seq)
767{
768 struct ceph_msg *msg;
769 struct ceph_mds_session_head *h;
770
771 msg = ceph_msg_new(CEPH_MSG_CLIENT_SESSION, sizeof(*h), GFP_NOFS,
772 false);
773 if (!msg) {
774 pr_err("create_session_msg ENOMEM creating msg\n");
775 return NULL;
776 }
777 h = msg->front.iov_base;
778 h->op = cpu_to_le32(op);
779 h->seq = cpu_to_le64(seq);
780 return msg;
781}
782
783/*
784 * send session open request.
785 *
786 * called under mdsc->mutex
787 */
788static int __open_session(struct ceph_mds_client *mdsc,
789 struct ceph_mds_session *session)
790{
791 struct ceph_msg *msg;
792 int mstate;
793 int mds = session->s_mds;
794
795 /* wait for mds to go active? */
796 mstate = ceph_mdsmap_get_state(mdsc->mdsmap, mds);
797 dout("open_session to mds%d (%s)\n", mds,
798 ceph_mds_state_name(mstate));
799 session->s_state = CEPH_MDS_SESSION_OPENING;
800 session->s_renew_requested = jiffies;
801
802 /* send connect message */
803 msg = create_session_msg(CEPH_SESSION_REQUEST_OPEN, session->s_seq);
804 if (!msg)
805 return -ENOMEM;
806 ceph_con_send(&session->s_con, msg);
807 return 0;
808}
809
810/*
811 * open sessions for any export targets for the given mds
812 *
813 * called under mdsc->mutex
814 */
815static void __open_export_target_sessions(struct ceph_mds_client *mdsc,
816 struct ceph_mds_session *session)
817{
818 struct ceph_mds_info *mi;
819 struct ceph_mds_session *ts;
820 int i, mds = session->s_mds;
821 int target;
822
823 if (mds >= mdsc->mdsmap->m_max_mds)
824 return;
825 mi = &mdsc->mdsmap->m_info[mds];
826 dout("open_export_target_sessions for mds%d (%d targets)\n",
827 session->s_mds, mi->num_export_targets);
828
829 for (i = 0; i < mi->num_export_targets; i++) {
830 target = mi->export_targets[i];
831 ts = __ceph_lookup_mds_session(mdsc, target);
832 if (!ts) {
833 ts = register_session(mdsc, target);
834 if (IS_ERR(ts))
835 return;
836 }
837 if (session->s_state == CEPH_MDS_SESSION_NEW ||
838 session->s_state == CEPH_MDS_SESSION_CLOSING)
839 __open_session(mdsc, session);
840 else
841 dout(" mds%d target mds%d %p is %s\n", session->s_mds,
842 i, ts, session_state_name(ts->s_state));
843 ceph_put_mds_session(ts);
844 }
845}
846
847void ceph_mdsc_open_export_target_sessions(struct ceph_mds_client *mdsc,
848 struct ceph_mds_session *session)
849{
850 mutex_lock(&mdsc->mutex);
851 __open_export_target_sessions(mdsc, session);
852 mutex_unlock(&mdsc->mutex);
853}
854
855/*
856 * session caps
857 */
858
859/*
860 * Free preallocated cap messages assigned to this session
861 */
862static void cleanup_cap_releases(struct ceph_mds_session *session)
863{
864 struct ceph_msg *msg;
865
866 spin_lock(&session->s_cap_lock);
867 while (!list_empty(&session->s_cap_releases)) {
868 msg = list_first_entry(&session->s_cap_releases,
869 struct ceph_msg, list_head);
870 list_del_init(&msg->list_head);
871 ceph_msg_put(msg);
872 }
873 while (!list_empty(&session->s_cap_releases_done)) {
874 msg = list_first_entry(&session->s_cap_releases_done,
875 struct ceph_msg, list_head);
876 list_del_init(&msg->list_head);
877 ceph_msg_put(msg);
878 }
879 spin_unlock(&session->s_cap_lock);
880}
881
882/*
883 * Helper to safely iterate over all caps associated with a session, with
884 * special care taken to handle a racing __ceph_remove_cap().
885 *
886 * Caller must hold session s_mutex.
887 */
888static int iterate_session_caps(struct ceph_mds_session *session,
889 int (*cb)(struct inode *, struct ceph_cap *,
890 void *), void *arg)
891{
892 struct list_head *p;
893 struct ceph_cap *cap;
894 struct inode *inode, *last_inode = NULL;
895 struct ceph_cap *old_cap = NULL;
896 int ret;
897
898 dout("iterate_session_caps %p mds%d\n", session, session->s_mds);
899 spin_lock(&session->s_cap_lock);
900 p = session->s_caps.next;
901 while (p != &session->s_caps) {
902 cap = list_entry(p, struct ceph_cap, session_caps);
903 inode = igrab(&cap->ci->vfs_inode);
904 if (!inode) {
905 p = p->next;
906 continue;
907 }
908 session->s_cap_iterator = cap;
909 spin_unlock(&session->s_cap_lock);
910
911 if (last_inode) {
912 iput(last_inode);
913 last_inode = NULL;
914 }
915 if (old_cap) {
916 ceph_put_cap(session->s_mdsc, old_cap);
917 old_cap = NULL;
918 }
919
920 ret = cb(inode, cap, arg);
921 last_inode = inode;
922
923 spin_lock(&session->s_cap_lock);
924 p = p->next;
925 if (cap->ci == NULL) {
926 dout("iterate_session_caps finishing cap %p removal\n",
927 cap);
928 BUG_ON(cap->session != session);
929 list_del_init(&cap->session_caps);
930 session->s_nr_caps--;
931 cap->session = NULL;
932 old_cap = cap; /* put_cap it w/o locks held */
933 }
934 if (ret < 0)
935 goto out;
936 }
937 ret = 0;
938out:
939 session->s_cap_iterator = NULL;
940 spin_unlock(&session->s_cap_lock);
941
942 if (last_inode)
943 iput(last_inode);
944 if (old_cap)
945 ceph_put_cap(session->s_mdsc, old_cap);
946
947 return ret;
948}
949
950static int remove_session_caps_cb(struct inode *inode, struct ceph_cap *cap,
951 void *arg)
952{
953 struct ceph_inode_info *ci = ceph_inode(inode);
954 int drop = 0;
955
956 dout("removing cap %p, ci is %p, inode is %p\n",
957 cap, ci, &ci->vfs_inode);
958 spin_lock(&ci->i_ceph_lock);
959 __ceph_remove_cap(cap);
960 if (!__ceph_is_any_real_caps(ci)) {
961 struct ceph_mds_client *mdsc =
962 ceph_sb_to_client(inode->i_sb)->mdsc;
963
964 spin_lock(&mdsc->cap_dirty_lock);
965 if (!list_empty(&ci->i_dirty_item)) {
966 pr_info(" dropping dirty %s state for %p %lld\n",
967 ceph_cap_string(ci->i_dirty_caps),
968 inode, ceph_ino(inode));
969 ci->i_dirty_caps = 0;
970 list_del_init(&ci->i_dirty_item);
971 drop = 1;
972 }
973 if (!list_empty(&ci->i_flushing_item)) {
974 pr_info(" dropping dirty+flushing %s state for %p %lld\n",
975 ceph_cap_string(ci->i_flushing_caps),
976 inode, ceph_ino(inode));
977 ci->i_flushing_caps = 0;
978 list_del_init(&ci->i_flushing_item);
979 mdsc->num_cap_flushing--;
980 drop = 1;
981 }
982 if (drop && ci->i_wrbuffer_ref) {
983 pr_info(" dropping dirty data for %p %lld\n",
984 inode, ceph_ino(inode));
985 ci->i_wrbuffer_ref = 0;
986 ci->i_wrbuffer_ref_head = 0;
987 drop++;
988 }
989 spin_unlock(&mdsc->cap_dirty_lock);
990 }
991 spin_unlock(&ci->i_ceph_lock);
992 while (drop--)
993 iput(inode);
994 return 0;
995}
996
997/*
998 * caller must hold session s_mutex
999 */
1000static void remove_session_caps(struct ceph_mds_session *session)
1001{
1002 dout("remove_session_caps on %p\n", session);
1003 iterate_session_caps(session, remove_session_caps_cb, NULL);
1004 BUG_ON(session->s_nr_caps > 0);
1005 BUG_ON(!list_empty(&session->s_cap_flushing));
1006 cleanup_cap_releases(session);
1007}
1008
1009/*
1010 * wake up any threads waiting on this session's caps. if the cap is
1011 * old (didn't get renewed on the client reconnect), remove it now.
1012 *
1013 * caller must hold s_mutex.
1014 */
1015static int wake_up_session_cb(struct inode *inode, struct ceph_cap *cap,
1016 void *arg)
1017{
1018 struct ceph_inode_info *ci = ceph_inode(inode);
1019
1020 wake_up_all(&ci->i_cap_wq);
1021 if (arg) {
1022 spin_lock(&ci->i_ceph_lock);
1023 ci->i_wanted_max_size = 0;
1024 ci->i_requested_max_size = 0;
1025 spin_unlock(&ci->i_ceph_lock);
1026 }
1027 return 0;
1028}
1029
1030static void wake_up_session_caps(struct ceph_mds_session *session,
1031 int reconnect)
1032{
1033 dout("wake_up_session_caps %p mds%d\n", session, session->s_mds);
1034 iterate_session_caps(session, wake_up_session_cb,
1035 (void *)(unsigned long)reconnect);
1036}
1037
1038/*
1039 * Send periodic message to MDS renewing all currently held caps. The
1040 * ack will reset the expiration for all caps from this session.
1041 *
1042 * caller holds s_mutex
1043 */
1044static int send_renew_caps(struct ceph_mds_client *mdsc,
1045 struct ceph_mds_session *session)
1046{
1047 struct ceph_msg *msg;
1048 int state;
1049
1050 if (time_after_eq(jiffies, session->s_cap_ttl) &&
1051 time_after_eq(session->s_cap_ttl, session->s_renew_requested))
1052 pr_info("mds%d caps stale\n", session->s_mds);
1053 session->s_renew_requested = jiffies;
1054
1055 /* do not try to renew caps until a recovering mds has reconnected
1056 * with its clients. */
1057 state = ceph_mdsmap_get_state(mdsc->mdsmap, session->s_mds);
1058 if (state < CEPH_MDS_STATE_RECONNECT) {
1059 dout("send_renew_caps ignoring mds%d (%s)\n",
1060 session->s_mds, ceph_mds_state_name(state));
1061 return 0;
1062 }
1063
1064 dout("send_renew_caps to mds%d (%s)\n", session->s_mds,
1065 ceph_mds_state_name(state));
1066 msg = create_session_msg(CEPH_SESSION_REQUEST_RENEWCAPS,
1067 ++session->s_renew_seq);
1068 if (!msg)
1069 return -ENOMEM;
1070 ceph_con_send(&session->s_con, msg);
1071 return 0;
1072}
1073
1074/*
1075 * Note new cap ttl, and any transition from stale -> not stale (fresh?).
1076 *
1077 * Called under session->s_mutex
1078 */
1079static void renewed_caps(struct ceph_mds_client *mdsc,
1080 struct ceph_mds_session *session, int is_renew)
1081{
1082 int was_stale;
1083 int wake = 0;
1084
1085 spin_lock(&session->s_cap_lock);
1086 was_stale = is_renew && time_after_eq(jiffies, session->s_cap_ttl);
1087
1088 session->s_cap_ttl = session->s_renew_requested +
1089 mdsc->mdsmap->m_session_timeout*HZ;
1090
1091 if (was_stale) {
1092 if (time_before(jiffies, session->s_cap_ttl)) {
1093 pr_info("mds%d caps renewed\n", session->s_mds);
1094 wake = 1;
1095 } else {
1096 pr_info("mds%d caps still stale\n", session->s_mds);
1097 }
1098 }
1099 dout("renewed_caps mds%d ttl now %lu, was %s, now %s\n",
1100 session->s_mds, session->s_cap_ttl, was_stale ? "stale" : "fresh",
1101 time_before(jiffies, session->s_cap_ttl) ? "stale" : "fresh");
1102 spin_unlock(&session->s_cap_lock);
1103
1104 if (wake)
1105 wake_up_session_caps(session, 0);
1106}
1107
1108/*
1109 * send a session close request
1110 */
1111static int request_close_session(struct ceph_mds_client *mdsc,
1112 struct ceph_mds_session *session)
1113{
1114 struct ceph_msg *msg;
1115
1116 dout("request_close_session mds%d state %s seq %lld\n",
1117 session->s_mds, session_state_name(session->s_state),
1118 session->s_seq);
1119 msg = create_session_msg(CEPH_SESSION_REQUEST_CLOSE, session->s_seq);
1120 if (!msg)
1121 return -ENOMEM;
1122 ceph_con_send(&session->s_con, msg);
1123 return 0;
1124}
1125
1126/*
1127 * Called with s_mutex held.
1128 */
1129static int __close_session(struct ceph_mds_client *mdsc,
1130 struct ceph_mds_session *session)
1131{
1132 if (session->s_state >= CEPH_MDS_SESSION_CLOSING)
1133 return 0;
1134 session->s_state = CEPH_MDS_SESSION_CLOSING;
1135 return request_close_session(mdsc, session);
1136}
1137
1138/*
1139 * Trim old(er) caps.
1140 *
1141 * Because we can't cache an inode without one or more caps, we do
1142 * this indirectly: if a cap is unused, we prune its aliases, at which
1143 * point the inode will hopefully get dropped to.
1144 *
1145 * Yes, this is a bit sloppy. Our only real goal here is to respond to
1146 * memory pressure from the MDS, though, so it needn't be perfect.
1147 */
1148static int trim_caps_cb(struct inode *inode, struct ceph_cap *cap, void *arg)
1149{
1150 struct ceph_mds_session *session = arg;
1151 struct ceph_inode_info *ci = ceph_inode(inode);
1152 int used, oissued, mine;
1153
1154 if (session->s_trim_caps <= 0)
1155 return -1;
1156
1157 spin_lock(&ci->i_ceph_lock);
1158 mine = cap->issued | cap->implemented;
1159 used = __ceph_caps_used(ci);
1160 oissued = __ceph_caps_issued_other(ci, cap);
1161
1162 dout("trim_caps_cb %p cap %p mine %s oissued %s used %s\n",
1163 inode, cap, ceph_cap_string(mine), ceph_cap_string(oissued),
1164 ceph_cap_string(used));
1165 if (ci->i_dirty_caps)
1166 goto out; /* dirty caps */
1167 if ((used & ~oissued) & mine)
1168 goto out; /* we need these caps */
1169
1170 session->s_trim_caps--;
1171 if (oissued) {
1172 /* we aren't the only cap.. just remove us */
1173 __ceph_remove_cap(cap);
1174 } else {
1175 /* try to drop referring dentries */
1176 spin_unlock(&ci->i_ceph_lock);
1177 d_prune_aliases(inode);
1178 dout("trim_caps_cb %p cap %p pruned, count now %d\n",
1179 inode, cap, atomic_read(&inode->i_count));
1180 return 0;
1181 }
1182
1183out:
1184 spin_unlock(&ci->i_ceph_lock);
1185 return 0;
1186}
1187
1188/*
1189 * Trim session cap count down to some max number.
1190 */
1191static int trim_caps(struct ceph_mds_client *mdsc,
1192 struct ceph_mds_session *session,
1193 int max_caps)
1194{
1195 int trim_caps = session->s_nr_caps - max_caps;
1196
1197 dout("trim_caps mds%d start: %d / %d, trim %d\n",
1198 session->s_mds, session->s_nr_caps, max_caps, trim_caps);
1199 if (trim_caps > 0) {
1200 session->s_trim_caps = trim_caps;
1201 iterate_session_caps(session, trim_caps_cb, session);
1202 dout("trim_caps mds%d done: %d / %d, trimmed %d\n",
1203 session->s_mds, session->s_nr_caps, max_caps,
1204 trim_caps - session->s_trim_caps);
1205 session->s_trim_caps = 0;
1206 }
1207 return 0;
1208}
1209
1210/*
1211 * Allocate cap_release messages. If there is a partially full message
1212 * in the queue, try to allocate enough to cover it's remainder, so that
1213 * we can send it immediately.
1214 *
1215 * Called under s_mutex.
1216 */
1217int ceph_add_cap_releases(struct ceph_mds_client *mdsc,
1218 struct ceph_mds_session *session)
1219{
1220 struct ceph_msg *msg, *partial = NULL;
1221 struct ceph_mds_cap_release *head;
1222 int err = -ENOMEM;
1223 int extra = mdsc->fsc->mount_options->cap_release_safety;
1224 int num;
1225
1226 dout("add_cap_releases %p mds%d extra %d\n", session, session->s_mds,
1227 extra);
1228
1229 spin_lock(&session->s_cap_lock);
1230
1231 if (!list_empty(&session->s_cap_releases)) {
1232 msg = list_first_entry(&session->s_cap_releases,
1233 struct ceph_msg,
1234 list_head);
1235 head = msg->front.iov_base;
1236 num = le32_to_cpu(head->num);
1237 if (num) {
1238 dout(" partial %p with (%d/%d)\n", msg, num,
1239 (int)CEPH_CAPS_PER_RELEASE);
1240 extra += CEPH_CAPS_PER_RELEASE - num;
1241 partial = msg;
1242 }
1243 }
1244 while (session->s_num_cap_releases < session->s_nr_caps + extra) {
1245 spin_unlock(&session->s_cap_lock);
1246 msg = ceph_msg_new(CEPH_MSG_CLIENT_CAPRELEASE, PAGE_CACHE_SIZE,
1247 GFP_NOFS, false);
1248 if (!msg)
1249 goto out_unlocked;
1250 dout("add_cap_releases %p msg %p now %d\n", session, msg,
1251 (int)msg->front.iov_len);
1252 head = msg->front.iov_base;
1253 head->num = cpu_to_le32(0);
1254 msg->front.iov_len = sizeof(*head);
1255 spin_lock(&session->s_cap_lock);
1256 list_add(&msg->list_head, &session->s_cap_releases);
1257 session->s_num_cap_releases += CEPH_CAPS_PER_RELEASE;
1258 }
1259
1260 if (partial) {
1261 head = partial->front.iov_base;
1262 num = le32_to_cpu(head->num);
1263 dout(" queueing partial %p with %d/%d\n", partial, num,
1264 (int)CEPH_CAPS_PER_RELEASE);
1265 list_move_tail(&partial->list_head,
1266 &session->s_cap_releases_done);
1267 session->s_num_cap_releases -= CEPH_CAPS_PER_RELEASE - num;
1268 }
1269 err = 0;
1270 spin_unlock(&session->s_cap_lock);
1271out_unlocked:
1272 return err;
1273}
1274
1275/*
1276 * flush all dirty inode data to disk.
1277 *
1278 * returns true if we've flushed through want_flush_seq
1279 */
1280static int check_cap_flush(struct ceph_mds_client *mdsc, u64 want_flush_seq)
1281{
1282 int mds, ret = 1;
1283
1284 dout("check_cap_flush want %lld\n", want_flush_seq);
1285 mutex_lock(&mdsc->mutex);
1286 for (mds = 0; ret && mds < mdsc->max_sessions; mds++) {
1287 struct ceph_mds_session *session = mdsc->sessions[mds];
1288
1289 if (!session)
1290 continue;
1291 get_session(session);
1292 mutex_unlock(&mdsc->mutex);
1293
1294 mutex_lock(&session->s_mutex);
1295 if (!list_empty(&session->s_cap_flushing)) {
1296 struct ceph_inode_info *ci =
1297 list_entry(session->s_cap_flushing.next,
1298 struct ceph_inode_info,
1299 i_flushing_item);
1300 struct inode *inode = &ci->vfs_inode;
1301
1302 spin_lock(&ci->i_ceph_lock);
1303 if (ci->i_cap_flush_seq <= want_flush_seq) {
1304 dout("check_cap_flush still flushing %p "
1305 "seq %lld <= %lld to mds%d\n", inode,
1306 ci->i_cap_flush_seq, want_flush_seq,
1307 session->s_mds);
1308 ret = 0;
1309 }
1310 spin_unlock(&ci->i_ceph_lock);
1311 }
1312 mutex_unlock(&session->s_mutex);
1313 ceph_put_mds_session(session);
1314
1315 if (!ret)
1316 return ret;
1317 mutex_lock(&mdsc->mutex);
1318 }
1319
1320 mutex_unlock(&mdsc->mutex);
1321 dout("check_cap_flush ok, flushed thru %lld\n", want_flush_seq);
1322 return ret;
1323}
1324
1325/*
1326 * called under s_mutex
1327 */
1328void ceph_send_cap_releases(struct ceph_mds_client *mdsc,
1329 struct ceph_mds_session *session)
1330{
1331 struct ceph_msg *msg;
1332
1333 dout("send_cap_releases mds%d\n", session->s_mds);
1334 spin_lock(&session->s_cap_lock);
1335 while (!list_empty(&session->s_cap_releases_done)) {
1336 msg = list_first_entry(&session->s_cap_releases_done,
1337 struct ceph_msg, list_head);
1338 list_del_init(&msg->list_head);
1339 spin_unlock(&session->s_cap_lock);
1340 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
1341 dout("send_cap_releases mds%d %p\n", session->s_mds, msg);
1342 ceph_con_send(&session->s_con, msg);
1343 spin_lock(&session->s_cap_lock);
1344 }
1345 spin_unlock(&session->s_cap_lock);
1346}
1347
1348static void discard_cap_releases(struct ceph_mds_client *mdsc,
1349 struct ceph_mds_session *session)
1350{
1351 struct ceph_msg *msg;
1352 struct ceph_mds_cap_release *head;
1353 unsigned num;
1354
1355 dout("discard_cap_releases mds%d\n", session->s_mds);
1356 spin_lock(&session->s_cap_lock);
1357
1358 /* zero out the in-progress message */
1359 msg = list_first_entry(&session->s_cap_releases,
1360 struct ceph_msg, list_head);
1361 head = msg->front.iov_base;
1362 num = le32_to_cpu(head->num);
1363 dout("discard_cap_releases mds%d %p %u\n", session->s_mds, msg, num);
1364 head->num = cpu_to_le32(0);
1365 session->s_num_cap_releases += num;
1366
1367 /* requeue completed messages */
1368 while (!list_empty(&session->s_cap_releases_done)) {
1369 msg = list_first_entry(&session->s_cap_releases_done,
1370 struct ceph_msg, list_head);
1371 list_del_init(&msg->list_head);
1372
1373 head = msg->front.iov_base;
1374 num = le32_to_cpu(head->num);
1375 dout("discard_cap_releases mds%d %p %u\n", session->s_mds, msg,
1376 num);
1377 session->s_num_cap_releases += num;
1378 head->num = cpu_to_le32(0);
1379 msg->front.iov_len = sizeof(*head);
1380 list_add(&msg->list_head, &session->s_cap_releases);
1381 }
1382
1383 spin_unlock(&session->s_cap_lock);
1384}
1385
1386/*
1387 * requests
1388 */
1389
1390/*
1391 * Create an mds request.
1392 */
1393struct ceph_mds_request *
1394ceph_mdsc_create_request(struct ceph_mds_client *mdsc, int op, int mode)
1395{
1396 struct ceph_mds_request *req = kzalloc(sizeof(*req), GFP_NOFS);
1397
1398 if (!req)
1399 return ERR_PTR(-ENOMEM);
1400
1401 mutex_init(&req->r_fill_mutex);
1402 req->r_mdsc = mdsc;
1403 req->r_started = jiffies;
1404 req->r_resend_mds = -1;
1405 INIT_LIST_HEAD(&req->r_unsafe_dir_item);
1406 req->r_fmode = -1;
1407 kref_init(&req->r_kref);
1408 INIT_LIST_HEAD(&req->r_wait);
1409 init_completion(&req->r_completion);
1410 init_completion(&req->r_safe_completion);
1411 INIT_LIST_HEAD(&req->r_unsafe_item);
1412
1413 req->r_op = op;
1414 req->r_direct_mode = mode;
1415 return req;
1416}
1417
1418/*
1419 * return oldest (lowest) request, tid in request tree, 0 if none.
1420 *
1421 * called under mdsc->mutex.
1422 */
1423static struct ceph_mds_request *__get_oldest_req(struct ceph_mds_client *mdsc)
1424{
1425 if (RB_EMPTY_ROOT(&mdsc->request_tree))
1426 return NULL;
1427 return rb_entry(rb_first(&mdsc->request_tree),
1428 struct ceph_mds_request, r_node);
1429}
1430
1431static u64 __get_oldest_tid(struct ceph_mds_client *mdsc)
1432{
1433 struct ceph_mds_request *req = __get_oldest_req(mdsc);
1434
1435 if (req)
1436 return req->r_tid;
1437 return 0;
1438}
1439
1440/*
1441 * Build a dentry's path. Allocate on heap; caller must kfree. Based
1442 * on build_path_from_dentry in fs/cifs/dir.c.
1443 *
1444 * If @stop_on_nosnap, generate path relative to the first non-snapped
1445 * inode.
1446 *
1447 * Encode hidden .snap dirs as a double /, i.e.
1448 * foo/.snap/bar -> foo//bar
1449 */
1450char *ceph_mdsc_build_path(struct dentry *dentry, int *plen, u64 *base,
1451 int stop_on_nosnap)
1452{
1453 struct dentry *temp;
1454 char *path;
1455 int len, pos;
1456 unsigned seq;
1457
1458 if (dentry == NULL)
1459 return ERR_PTR(-EINVAL);
1460
1461retry:
1462 len = 0;
1463 seq = read_seqbegin(&rename_lock);
1464 rcu_read_lock();
1465 for (temp = dentry; !IS_ROOT(temp);) {
1466 struct inode *inode = temp->d_inode;
1467 if (inode && ceph_snap(inode) == CEPH_SNAPDIR)
1468 len++; /* slash only */
1469 else if (stop_on_nosnap && inode &&
1470 ceph_snap(inode) == CEPH_NOSNAP)
1471 break;
1472 else
1473 len += 1 + temp->d_name.len;
1474 temp = temp->d_parent;
1475 if (temp == NULL) {
1476 rcu_read_unlock();
1477 pr_err("build_path corrupt dentry %p\n", dentry);
1478 return ERR_PTR(-EINVAL);
1479 }
1480 }
1481 rcu_read_unlock();
1482 if (len)
1483 len--; /* no leading '/' */
1484
1485 path = kmalloc(len+1, GFP_NOFS);
1486 if (path == NULL)
1487 return ERR_PTR(-ENOMEM);
1488 pos = len;
1489 path[pos] = 0; /* trailing null */
1490 rcu_read_lock();
1491 for (temp = dentry; !IS_ROOT(temp) && pos != 0; ) {
1492 struct inode *inode;
1493
1494 spin_lock(&temp->d_lock);
1495 inode = temp->d_inode;
1496 if (inode && ceph_snap(inode) == CEPH_SNAPDIR) {
1497 dout("build_path path+%d: %p SNAPDIR\n",
1498 pos, temp);
1499 } else if (stop_on_nosnap && inode &&
1500 ceph_snap(inode) == CEPH_NOSNAP) {
1501 spin_unlock(&temp->d_lock);
1502 break;
1503 } else {
1504 pos -= temp->d_name.len;
1505 if (pos < 0) {
1506 spin_unlock(&temp->d_lock);
1507 break;
1508 }
1509 strncpy(path + pos, temp->d_name.name,
1510 temp->d_name.len);
1511 }
1512 spin_unlock(&temp->d_lock);
1513 if (pos)
1514 path[--pos] = '/';
1515 temp = temp->d_parent;
1516 if (temp == NULL) {
1517 rcu_read_unlock();
1518 pr_err("build_path corrupt dentry\n");
1519 kfree(path);
1520 return ERR_PTR(-EINVAL);
1521 }
1522 }
1523 rcu_read_unlock();
1524 if (pos != 0 || read_seqretry(&rename_lock, seq)) {
1525 pr_err("build_path did not end path lookup where "
1526 "expected, namelen is %d, pos is %d\n", len, pos);
1527 /* presumably this is only possible if racing with a
1528 rename of one of the parent directories (we can not
1529 lock the dentries above us to prevent this, but
1530 retrying should be harmless) */
1531 kfree(path);
1532 goto retry;
1533 }
1534
1535 *base = ceph_ino(temp->d_inode);
1536 *plen = len;
1537 dout("build_path on %p %d built %llx '%.*s'\n",
1538 dentry, dentry->d_count, *base, len, path);
1539 return path;
1540}
1541
1542static int build_dentry_path(struct dentry *dentry,
1543 const char **ppath, int *ppathlen, u64 *pino,
1544 int *pfreepath)
1545{
1546 char *path;
1547
1548 if (ceph_snap(dentry->d_parent->d_inode) == CEPH_NOSNAP) {
1549 *pino = ceph_ino(dentry->d_parent->d_inode);
1550 *ppath = dentry->d_name.name;
1551 *ppathlen = dentry->d_name.len;
1552 return 0;
1553 }
1554 path = ceph_mdsc_build_path(dentry, ppathlen, pino, 1);
1555 if (IS_ERR(path))
1556 return PTR_ERR(path);
1557 *ppath = path;
1558 *pfreepath = 1;
1559 return 0;
1560}
1561
1562static int build_inode_path(struct inode *inode,
1563 const char **ppath, int *ppathlen, u64 *pino,
1564 int *pfreepath)
1565{
1566 struct dentry *dentry;
1567 char *path;
1568
1569 if (ceph_snap(inode) == CEPH_NOSNAP) {
1570 *pino = ceph_ino(inode);
1571 *ppathlen = 0;
1572 return 0;
1573 }
1574 dentry = d_find_alias(inode);
1575 path = ceph_mdsc_build_path(dentry, ppathlen, pino, 1);
1576 dput(dentry);
1577 if (IS_ERR(path))
1578 return PTR_ERR(path);
1579 *ppath = path;
1580 *pfreepath = 1;
1581 return 0;
1582}
1583
1584/*
1585 * request arguments may be specified via an inode *, a dentry *, or
1586 * an explicit ino+path.
1587 */
1588static int set_request_path_attr(struct inode *rinode, struct dentry *rdentry,
1589 const char *rpath, u64 rino,
1590 const char **ppath, int *pathlen,
1591 u64 *ino, int *freepath)
1592{
1593 int r = 0;
1594
1595 if (rinode) {
1596 r = build_inode_path(rinode, ppath, pathlen, ino, freepath);
1597 dout(" inode %p %llx.%llx\n", rinode, ceph_ino(rinode),
1598 ceph_snap(rinode));
1599 } else if (rdentry) {
1600 r = build_dentry_path(rdentry, ppath, pathlen, ino, freepath);
1601 dout(" dentry %p %llx/%.*s\n", rdentry, *ino, *pathlen,
1602 *ppath);
1603 } else if (rpath || rino) {
1604 *ino = rino;
1605 *ppath = rpath;
1606 *pathlen = strlen(rpath);
1607 dout(" path %.*s\n", *pathlen, rpath);
1608 }
1609
1610 return r;
1611}
1612
1613/*
1614 * called under mdsc->mutex
1615 */
1616static struct ceph_msg *create_request_message(struct ceph_mds_client *mdsc,
1617 struct ceph_mds_request *req,
1618 int mds)
1619{
1620 struct ceph_msg *msg;
1621 struct ceph_mds_request_head *head;
1622 const char *path1 = NULL;
1623 const char *path2 = NULL;
1624 u64 ino1 = 0, ino2 = 0;
1625 int pathlen1 = 0, pathlen2 = 0;
1626 int freepath1 = 0, freepath2 = 0;
1627 int len;
1628 u16 releases;
1629 void *p, *end;
1630 int ret;
1631
1632 ret = set_request_path_attr(req->r_inode, req->r_dentry,
1633 req->r_path1, req->r_ino1.ino,
1634 &path1, &pathlen1, &ino1, &freepath1);
1635 if (ret < 0) {
1636 msg = ERR_PTR(ret);
1637 goto out;
1638 }
1639
1640 ret = set_request_path_attr(NULL, req->r_old_dentry,
1641 req->r_path2, req->r_ino2.ino,
1642 &path2, &pathlen2, &ino2, &freepath2);
1643 if (ret < 0) {
1644 msg = ERR_PTR(ret);
1645 goto out_free1;
1646 }
1647
1648 len = sizeof(*head) +
1649 pathlen1 + pathlen2 + 2*(1 + sizeof(u32) + sizeof(u64));
1650
1651 /* calculate (max) length for cap releases */
1652 len += sizeof(struct ceph_mds_request_release) *
1653 (!!req->r_inode_drop + !!req->r_dentry_drop +
1654 !!req->r_old_inode_drop + !!req->r_old_dentry_drop);
1655 if (req->r_dentry_drop)
1656 len += req->r_dentry->d_name.len;
1657 if (req->r_old_dentry_drop)
1658 len += req->r_old_dentry->d_name.len;
1659
1660 msg = ceph_msg_new(CEPH_MSG_CLIENT_REQUEST, len, GFP_NOFS, false);
1661 if (!msg) {
1662 msg = ERR_PTR(-ENOMEM);
1663 goto out_free2;
1664 }
1665
1666 msg->hdr.tid = cpu_to_le64(req->r_tid);
1667
1668 head = msg->front.iov_base;
1669 p = msg->front.iov_base + sizeof(*head);
1670 end = msg->front.iov_base + msg->front.iov_len;
1671
1672 head->mdsmap_epoch = cpu_to_le32(mdsc->mdsmap->m_epoch);
1673 head->op = cpu_to_le32(req->r_op);
1674 head->caller_uid = cpu_to_le32(req->r_uid);
1675 head->caller_gid = cpu_to_le32(req->r_gid);
1676 head->args = req->r_args;
1677
1678 ceph_encode_filepath(&p, end, ino1, path1);
1679 ceph_encode_filepath(&p, end, ino2, path2);
1680
1681 /* make note of release offset, in case we need to replay */
1682 req->r_request_release_offset = p - msg->front.iov_base;
1683
1684 /* cap releases */
1685 releases = 0;
1686 if (req->r_inode_drop)
1687 releases += ceph_encode_inode_release(&p,
1688 req->r_inode ? req->r_inode : req->r_dentry->d_inode,
1689 mds, req->r_inode_drop, req->r_inode_unless, 0);
1690 if (req->r_dentry_drop)
1691 releases += ceph_encode_dentry_release(&p, req->r_dentry,
1692 mds, req->r_dentry_drop, req->r_dentry_unless);
1693 if (req->r_old_dentry_drop)
1694 releases += ceph_encode_dentry_release(&p, req->r_old_dentry,
1695 mds, req->r_old_dentry_drop, req->r_old_dentry_unless);
1696 if (req->r_old_inode_drop)
1697 releases += ceph_encode_inode_release(&p,
1698 req->r_old_dentry->d_inode,
1699 mds, req->r_old_inode_drop, req->r_old_inode_unless, 0);
1700 head->num_releases = cpu_to_le16(releases);
1701
1702 BUG_ON(p > end);
1703 msg->front.iov_len = p - msg->front.iov_base;
1704 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
1705
1706 msg->pages = req->r_pages;
1707 msg->nr_pages = req->r_num_pages;
1708 msg->hdr.data_len = cpu_to_le32(req->r_data_len);
1709 msg->hdr.data_off = cpu_to_le16(0);
1710
1711out_free2:
1712 if (freepath2)
1713 kfree((char *)path2);
1714out_free1:
1715 if (freepath1)
1716 kfree((char *)path1);
1717out:
1718 return msg;
1719}
1720
1721/*
1722 * called under mdsc->mutex if error, under no mutex if
1723 * success.
1724 */
1725static void complete_request(struct ceph_mds_client *mdsc,
1726 struct ceph_mds_request *req)
1727{
1728 if (req->r_callback)
1729 req->r_callback(mdsc, req);
1730 else
1731 complete_all(&req->r_completion);
1732}
1733
1734/*
1735 * called under mdsc->mutex
1736 */
1737static int __prepare_send_request(struct ceph_mds_client *mdsc,
1738 struct ceph_mds_request *req,
1739 int mds)
1740{
1741 struct ceph_mds_request_head *rhead;
1742 struct ceph_msg *msg;
1743 int flags = 0;
1744
1745 req->r_attempts++;
1746 if (req->r_inode) {
1747 struct ceph_cap *cap =
1748 ceph_get_cap_for_mds(ceph_inode(req->r_inode), mds);
1749
1750 if (cap)
1751 req->r_sent_on_mseq = cap->mseq;
1752 else
1753 req->r_sent_on_mseq = -1;
1754 }
1755 dout("prepare_send_request %p tid %lld %s (attempt %d)\n", req,
1756 req->r_tid, ceph_mds_op_name(req->r_op), req->r_attempts);
1757
1758 if (req->r_got_unsafe) {
1759 /*
1760 * Replay. Do not regenerate message (and rebuild
1761 * paths, etc.); just use the original message.
1762 * Rebuilding paths will break for renames because
1763 * d_move mangles the src name.
1764 */
1765 msg = req->r_request;
1766 rhead = msg->front.iov_base;
1767
1768 flags = le32_to_cpu(rhead->flags);
1769 flags |= CEPH_MDS_FLAG_REPLAY;
1770 rhead->flags = cpu_to_le32(flags);
1771
1772 if (req->r_target_inode)
1773 rhead->ino = cpu_to_le64(ceph_ino(req->r_target_inode));
1774
1775 rhead->num_retry = req->r_attempts - 1;
1776
1777 /* remove cap/dentry releases from message */
1778 rhead->num_releases = 0;
1779 msg->hdr.front_len = cpu_to_le32(req->r_request_release_offset);
1780 msg->front.iov_len = req->r_request_release_offset;
1781 return 0;
1782 }
1783
1784 if (req->r_request) {
1785 ceph_msg_put(req->r_request);
1786 req->r_request = NULL;
1787 }
1788 msg = create_request_message(mdsc, req, mds);
1789 if (IS_ERR(msg)) {
1790 req->r_err = PTR_ERR(msg);
1791 complete_request(mdsc, req);
1792 return PTR_ERR(msg);
1793 }
1794 req->r_request = msg;
1795
1796 rhead = msg->front.iov_base;
1797 rhead->oldest_client_tid = cpu_to_le64(__get_oldest_tid(mdsc));
1798 if (req->r_got_unsafe)
1799 flags |= CEPH_MDS_FLAG_REPLAY;
1800 if (req->r_locked_dir)
1801 flags |= CEPH_MDS_FLAG_WANT_DENTRY;
1802 rhead->flags = cpu_to_le32(flags);
1803 rhead->num_fwd = req->r_num_fwd;
1804 rhead->num_retry = req->r_attempts - 1;
1805 rhead->ino = 0;
1806
1807 dout(" r_locked_dir = %p\n", req->r_locked_dir);
1808 return 0;
1809}
1810
1811/*
1812 * send request, or put it on the appropriate wait list.
1813 */
1814static int __do_request(struct ceph_mds_client *mdsc,
1815 struct ceph_mds_request *req)
1816{
1817 struct ceph_mds_session *session = NULL;
1818 int mds = -1;
1819 int err = -EAGAIN;
1820
1821 if (req->r_err || req->r_got_result)
1822 goto out;
1823
1824 if (req->r_timeout &&
1825 time_after_eq(jiffies, req->r_started + req->r_timeout)) {
1826 dout("do_request timed out\n");
1827 err = -EIO;
1828 goto finish;
1829 }
1830
1831 put_request_session(req);
1832
1833 mds = __choose_mds(mdsc, req);
1834 if (mds < 0 ||
1835 ceph_mdsmap_get_state(mdsc->mdsmap, mds) < CEPH_MDS_STATE_ACTIVE) {
1836 dout("do_request no mds or not active, waiting for map\n");
1837 list_add(&req->r_wait, &mdsc->waiting_for_map);
1838 goto out;
1839 }
1840
1841 /* get, open session */
1842 session = __ceph_lookup_mds_session(mdsc, mds);
1843 if (!session) {
1844 session = register_session(mdsc, mds);
1845 if (IS_ERR(session)) {
1846 err = PTR_ERR(session);
1847 goto finish;
1848 }
1849 }
1850 req->r_session = get_session(session);
1851
1852 dout("do_request mds%d session %p state %s\n", mds, session,
1853 session_state_name(session->s_state));
1854 if (session->s_state != CEPH_MDS_SESSION_OPEN &&
1855 session->s_state != CEPH_MDS_SESSION_HUNG) {
1856 if (session->s_state == CEPH_MDS_SESSION_NEW ||
1857 session->s_state == CEPH_MDS_SESSION_CLOSING)
1858 __open_session(mdsc, session);
1859 list_add(&req->r_wait, &session->s_waiting);
1860 goto out_session;
1861 }
1862
1863 /* send request */
1864 req->r_resend_mds = -1; /* forget any previous mds hint */
1865
1866 if (req->r_request_started == 0) /* note request start time */
1867 req->r_request_started = jiffies;
1868
1869 err = __prepare_send_request(mdsc, req, mds);
1870 if (!err) {
1871 ceph_msg_get(req->r_request);
1872 ceph_con_send(&session->s_con, req->r_request);
1873 }
1874
1875out_session:
1876 ceph_put_mds_session(session);
1877out:
1878 return err;
1879
1880finish:
1881 req->r_err = err;
1882 complete_request(mdsc, req);
1883 goto out;
1884}
1885
1886/*
1887 * called under mdsc->mutex
1888 */
1889static void __wake_requests(struct ceph_mds_client *mdsc,
1890 struct list_head *head)
1891{
1892 struct ceph_mds_request *req, *nreq;
1893
1894 list_for_each_entry_safe(req, nreq, head, r_wait) {
1895 list_del_init(&req->r_wait);
1896 __do_request(mdsc, req);
1897 }
1898}
1899
1900/*
1901 * Wake up threads with requests pending for @mds, so that they can
1902 * resubmit their requests to a possibly different mds.
1903 */
1904static void kick_requests(struct ceph_mds_client *mdsc, int mds)
1905{
1906 struct ceph_mds_request *req;
1907 struct rb_node *p;
1908
1909 dout("kick_requests mds%d\n", mds);
1910 for (p = rb_first(&mdsc->request_tree); p; p = rb_next(p)) {
1911 req = rb_entry(p, struct ceph_mds_request, r_node);
1912 if (req->r_got_unsafe)
1913 continue;
1914 if (req->r_session &&
1915 req->r_session->s_mds == mds) {
1916 dout(" kicking tid %llu\n", req->r_tid);
1917 __do_request(mdsc, req);
1918 }
1919 }
1920}
1921
1922void ceph_mdsc_submit_request(struct ceph_mds_client *mdsc,
1923 struct ceph_mds_request *req)
1924{
1925 dout("submit_request on %p\n", req);
1926 mutex_lock(&mdsc->mutex);
1927 __register_request(mdsc, req, NULL);
1928 __do_request(mdsc, req);
1929 mutex_unlock(&mdsc->mutex);
1930}
1931
1932/*
1933 * Synchrously perform an mds request. Take care of all of the
1934 * session setup, forwarding, retry details.
1935 */
1936int ceph_mdsc_do_request(struct ceph_mds_client *mdsc,
1937 struct inode *dir,
1938 struct ceph_mds_request *req)
1939{
1940 int err;
1941
1942 dout("do_request on %p\n", req);
1943
1944 /* take CAP_PIN refs for r_inode, r_locked_dir, r_old_dentry */
1945 if (req->r_inode)
1946 ceph_get_cap_refs(ceph_inode(req->r_inode), CEPH_CAP_PIN);
1947 if (req->r_locked_dir)
1948 ceph_get_cap_refs(ceph_inode(req->r_locked_dir), CEPH_CAP_PIN);
1949 if (req->r_old_dentry)
1950 ceph_get_cap_refs(ceph_inode(req->r_old_dentry_dir),
1951 CEPH_CAP_PIN);
1952
1953 /* issue */
1954 mutex_lock(&mdsc->mutex);
1955 __register_request(mdsc, req, dir);
1956 __do_request(mdsc, req);
1957
1958 if (req->r_err) {
1959 err = req->r_err;
1960 __unregister_request(mdsc, req);
1961 dout("do_request early error %d\n", err);
1962 goto out;
1963 }
1964
1965 /* wait */
1966 mutex_unlock(&mdsc->mutex);
1967 dout("do_request waiting\n");
1968 if (req->r_timeout) {
1969 err = (long)wait_for_completion_killable_timeout(
1970 &req->r_completion, req->r_timeout);
1971 if (err == 0)
1972 err = -EIO;
1973 } else {
1974 err = wait_for_completion_killable(&req->r_completion);
1975 }
1976 dout("do_request waited, got %d\n", err);
1977 mutex_lock(&mdsc->mutex);
1978
1979 /* only abort if we didn't race with a real reply */
1980 if (req->r_got_result) {
1981 err = le32_to_cpu(req->r_reply_info.head->result);
1982 } else if (err < 0) {
1983 dout("aborted request %lld with %d\n", req->r_tid, err);
1984
1985 /*
1986 * ensure we aren't running concurrently with
1987 * ceph_fill_trace or ceph_readdir_prepopulate, which
1988 * rely on locks (dir mutex) held by our caller.
1989 */
1990 mutex_lock(&req->r_fill_mutex);
1991 req->r_err = err;
1992 req->r_aborted = true;
1993 mutex_unlock(&req->r_fill_mutex);
1994
1995 if (req->r_locked_dir &&
1996 (req->r_op & CEPH_MDS_OP_WRITE))
1997 ceph_invalidate_dir_request(req);
1998 } else {
1999 err = req->r_err;
2000 }
2001
2002out:
2003 mutex_unlock(&mdsc->mutex);
2004 dout("do_request %p done, result %d\n", req, err);
2005 return err;
2006}
2007
2008/*
2009 * Invalidate dir D_COMPLETE, dentry lease state on an aborted MDS
2010 * namespace request.
2011 */
2012void ceph_invalidate_dir_request(struct ceph_mds_request *req)
2013{
2014 struct inode *inode = req->r_locked_dir;
2015 struct ceph_inode_info *ci = ceph_inode(inode);
2016
2017 dout("invalidate_dir_request %p (D_COMPLETE, lease(s))\n", inode);
2018 spin_lock(&ci->i_ceph_lock);
2019 ceph_dir_clear_complete(inode);
2020 ci->i_release_count++;
2021 spin_unlock(&ci->i_ceph_lock);
2022
2023 if (req->r_dentry)
2024 ceph_invalidate_dentry_lease(req->r_dentry);
2025 if (req->r_old_dentry)
2026 ceph_invalidate_dentry_lease(req->r_old_dentry);
2027}
2028
2029/*
2030 * Handle mds reply.
2031 *
2032 * We take the session mutex and parse and process the reply immediately.
2033 * This preserves the logical ordering of replies, capabilities, etc., sent
2034 * by the MDS as they are applied to our local cache.
2035 */
2036static void handle_reply(struct ceph_mds_session *session, struct ceph_msg *msg)
2037{
2038 struct ceph_mds_client *mdsc = session->s_mdsc;
2039 struct ceph_mds_request *req;
2040 struct ceph_mds_reply_head *head = msg->front.iov_base;
2041 struct ceph_mds_reply_info_parsed *rinfo; /* parsed reply info */
2042 u64 tid;
2043 int err, result;
2044 int mds = session->s_mds;
2045
2046 if (msg->front.iov_len < sizeof(*head)) {
2047 pr_err("mdsc_handle_reply got corrupt (short) reply\n");
2048 ceph_msg_dump(msg);
2049 return;
2050 }
2051
2052 /* get request, session */
2053 tid = le64_to_cpu(msg->hdr.tid);
2054 mutex_lock(&mdsc->mutex);
2055 req = __lookup_request(mdsc, tid);
2056 if (!req) {
2057 dout("handle_reply on unknown tid %llu\n", tid);
2058 mutex_unlock(&mdsc->mutex);
2059 return;
2060 }
2061 dout("handle_reply %p\n", req);
2062
2063 /* correct session? */
2064 if (req->r_session != session) {
2065 pr_err("mdsc_handle_reply got %llu on session mds%d"
2066 " not mds%d\n", tid, session->s_mds,
2067 req->r_session ? req->r_session->s_mds : -1);
2068 mutex_unlock(&mdsc->mutex);
2069 goto out;
2070 }
2071
2072 /* dup? */
2073 if ((req->r_got_unsafe && !head->safe) ||
2074 (req->r_got_safe && head->safe)) {
2075 pr_warning("got a dup %s reply on %llu from mds%d\n",
2076 head->safe ? "safe" : "unsafe", tid, mds);
2077 mutex_unlock(&mdsc->mutex);
2078 goto out;
2079 }
2080 if (req->r_got_safe && !head->safe) {
2081 pr_warning("got unsafe after safe on %llu from mds%d\n",
2082 tid, mds);
2083 mutex_unlock(&mdsc->mutex);
2084 goto out;
2085 }
2086
2087 result = le32_to_cpu(head->result);
2088
2089 /*
2090 * Handle an ESTALE
2091 * if we're not talking to the authority, send to them
2092 * if the authority has changed while we weren't looking,
2093 * send to new authority
2094 * Otherwise we just have to return an ESTALE
2095 */
2096 if (result == -ESTALE) {
2097 dout("got ESTALE on request %llu", req->r_tid);
2098 if (!req->r_inode) {
2099 /* do nothing; not an authority problem */
2100 } else if (req->r_direct_mode != USE_AUTH_MDS) {
2101 dout("not using auth, setting for that now");
2102 req->r_direct_mode = USE_AUTH_MDS;
2103 __do_request(mdsc, req);
2104 mutex_unlock(&mdsc->mutex);
2105 goto out;
2106 } else {
2107 struct ceph_inode_info *ci = ceph_inode(req->r_inode);
2108 struct ceph_cap *cap = NULL;
2109
2110 if (req->r_session)
2111 cap = ceph_get_cap_for_mds(ci,
2112 req->r_session->s_mds);
2113
2114 dout("already using auth");
2115 if ((!cap || cap != ci->i_auth_cap) ||
2116 (cap->mseq != req->r_sent_on_mseq)) {
2117 dout("but cap changed, so resending");
2118 __do_request(mdsc, req);
2119 mutex_unlock(&mdsc->mutex);
2120 goto out;
2121 }
2122 }
2123 dout("have to return ESTALE on request %llu", req->r_tid);
2124 }
2125
2126
2127 if (head->safe) {
2128 req->r_got_safe = true;
2129 __unregister_request(mdsc, req);
2130 complete_all(&req->r_safe_completion);
2131
2132 if (req->r_got_unsafe) {
2133 /*
2134 * We already handled the unsafe response, now do the
2135 * cleanup. No need to examine the response; the MDS
2136 * doesn't include any result info in the safe
2137 * response. And even if it did, there is nothing
2138 * useful we could do with a revised return value.
2139 */
2140 dout("got safe reply %llu, mds%d\n", tid, mds);
2141 list_del_init(&req->r_unsafe_item);
2142
2143 /* last unsafe request during umount? */
2144 if (mdsc->stopping && !__get_oldest_req(mdsc))
2145 complete_all(&mdsc->safe_umount_waiters);
2146 mutex_unlock(&mdsc->mutex);
2147 goto out;
2148 }
2149 } else {
2150 req->r_got_unsafe = true;
2151 list_add_tail(&req->r_unsafe_item, &req->r_session->s_unsafe);
2152 }
2153
2154 dout("handle_reply tid %lld result %d\n", tid, result);
2155 rinfo = &req->r_reply_info;
2156 err = parse_reply_info(msg, rinfo, session->s_con.peer_features);
2157 mutex_unlock(&mdsc->mutex);
2158
2159 mutex_lock(&session->s_mutex);
2160 if (err < 0) {
2161 pr_err("mdsc_handle_reply got corrupt reply mds%d(tid:%lld)\n", mds, tid);
2162 ceph_msg_dump(msg);
2163 goto out_err;
2164 }
2165
2166 /* snap trace */
2167 if (rinfo->snapblob_len) {
2168 down_write(&mdsc->snap_rwsem);
2169 ceph_update_snap_trace(mdsc, rinfo->snapblob,
2170 rinfo->snapblob + rinfo->snapblob_len,
2171 le32_to_cpu(head->op) == CEPH_MDS_OP_RMSNAP);
2172 downgrade_write(&mdsc->snap_rwsem);
2173 } else {
2174 down_read(&mdsc->snap_rwsem);
2175 }
2176
2177 /* insert trace into our cache */
2178 mutex_lock(&req->r_fill_mutex);
2179 err = ceph_fill_trace(mdsc->fsc->sb, req, req->r_session);
2180 if (err == 0) {
2181 if (result == 0 && req->r_op != CEPH_MDS_OP_GETFILELOCK &&
2182 rinfo->dir_nr)
2183 ceph_readdir_prepopulate(req, req->r_session);
2184 ceph_unreserve_caps(mdsc, &req->r_caps_reservation);
2185 }
2186 mutex_unlock(&req->r_fill_mutex);
2187
2188 up_read(&mdsc->snap_rwsem);
2189out_err:
2190 mutex_lock(&mdsc->mutex);
2191 if (!req->r_aborted) {
2192 if (err) {
2193 req->r_err = err;
2194 } else {
2195 req->r_reply = msg;
2196 ceph_msg_get(msg);
2197 req->r_got_result = true;
2198 }
2199 } else {
2200 dout("reply arrived after request %lld was aborted\n", tid);
2201 }
2202 mutex_unlock(&mdsc->mutex);
2203
2204 ceph_add_cap_releases(mdsc, req->r_session);
2205 mutex_unlock(&session->s_mutex);
2206
2207 /* kick calling process */
2208 complete_request(mdsc, req);
2209out:
2210 ceph_mdsc_put_request(req);
2211 return;
2212}
2213
2214
2215
2216/*
2217 * handle mds notification that our request has been forwarded.
2218 */
2219static void handle_forward(struct ceph_mds_client *mdsc,
2220 struct ceph_mds_session *session,
2221 struct ceph_msg *msg)
2222{
2223 struct ceph_mds_request *req;
2224 u64 tid = le64_to_cpu(msg->hdr.tid);
2225 u32 next_mds;
2226 u32 fwd_seq;
2227 int err = -EINVAL;
2228 void *p = msg->front.iov_base;
2229 void *end = p + msg->front.iov_len;
2230
2231 ceph_decode_need(&p, end, 2*sizeof(u32), bad);
2232 next_mds = ceph_decode_32(&p);
2233 fwd_seq = ceph_decode_32(&p);
2234
2235 mutex_lock(&mdsc->mutex);
2236 req = __lookup_request(mdsc, tid);
2237 if (!req) {
2238 dout("forward tid %llu to mds%d - req dne\n", tid, next_mds);
2239 goto out; /* dup reply? */
2240 }
2241
2242 if (req->r_aborted) {
2243 dout("forward tid %llu aborted, unregistering\n", tid);
2244 __unregister_request(mdsc, req);
2245 } else if (fwd_seq <= req->r_num_fwd) {
2246 dout("forward tid %llu to mds%d - old seq %d <= %d\n",
2247 tid, next_mds, req->r_num_fwd, fwd_seq);
2248 } else {
2249 /* resend. forward race not possible; mds would drop */
2250 dout("forward tid %llu to mds%d (we resend)\n", tid, next_mds);
2251 BUG_ON(req->r_err);
2252 BUG_ON(req->r_got_result);
2253 req->r_num_fwd = fwd_seq;
2254 req->r_resend_mds = next_mds;
2255 put_request_session(req);
2256 __do_request(mdsc, req);
2257 }
2258 ceph_mdsc_put_request(req);
2259out:
2260 mutex_unlock(&mdsc->mutex);
2261 return;
2262
2263bad:
2264 pr_err("mdsc_handle_forward decode error err=%d\n", err);
2265}
2266
2267/*
2268 * handle a mds session control message
2269 */
2270static void handle_session(struct ceph_mds_session *session,
2271 struct ceph_msg *msg)
2272{
2273 struct ceph_mds_client *mdsc = session->s_mdsc;
2274 u32 op;
2275 u64 seq;
2276 int mds = session->s_mds;
2277 struct ceph_mds_session_head *h = msg->front.iov_base;
2278 int wake = 0;
2279
2280 /* decode */
2281 if (msg->front.iov_len != sizeof(*h))
2282 goto bad;
2283 op = le32_to_cpu(h->op);
2284 seq = le64_to_cpu(h->seq);
2285
2286 mutex_lock(&mdsc->mutex);
2287 if (op == CEPH_SESSION_CLOSE)
2288 __unregister_session(mdsc, session);
2289 /* FIXME: this ttl calculation is generous */
2290 session->s_ttl = jiffies + HZ*mdsc->mdsmap->m_session_autoclose;
2291 mutex_unlock(&mdsc->mutex);
2292
2293 mutex_lock(&session->s_mutex);
2294
2295 dout("handle_session mds%d %s %p state %s seq %llu\n",
2296 mds, ceph_session_op_name(op), session,
2297 session_state_name(session->s_state), seq);
2298
2299 if (session->s_state == CEPH_MDS_SESSION_HUNG) {
2300 session->s_state = CEPH_MDS_SESSION_OPEN;
2301 pr_info("mds%d came back\n", session->s_mds);
2302 }
2303
2304 switch (op) {
2305 case CEPH_SESSION_OPEN:
2306 if (session->s_state == CEPH_MDS_SESSION_RECONNECTING)
2307 pr_info("mds%d reconnect success\n", session->s_mds);
2308 session->s_state = CEPH_MDS_SESSION_OPEN;
2309 renewed_caps(mdsc, session, 0);
2310 wake = 1;
2311 if (mdsc->stopping)
2312 __close_session(mdsc, session);
2313 break;
2314
2315 case CEPH_SESSION_RENEWCAPS:
2316 if (session->s_renew_seq == seq)
2317 renewed_caps(mdsc, session, 1);
2318 break;
2319
2320 case CEPH_SESSION_CLOSE:
2321 if (session->s_state == CEPH_MDS_SESSION_RECONNECTING)
2322 pr_info("mds%d reconnect denied\n", session->s_mds);
2323 remove_session_caps(session);
2324 wake = 1; /* for good measure */
2325 wake_up_all(&mdsc->session_close_wq);
2326 kick_requests(mdsc, mds);
2327 break;
2328
2329 case CEPH_SESSION_STALE:
2330 pr_info("mds%d caps went stale, renewing\n",
2331 session->s_mds);
2332 spin_lock(&session->s_gen_ttl_lock);
2333 session->s_cap_gen++;
2334 session->s_cap_ttl = jiffies - 1;
2335 spin_unlock(&session->s_gen_ttl_lock);
2336 send_renew_caps(mdsc, session);
2337 break;
2338
2339 case CEPH_SESSION_RECALL_STATE:
2340 trim_caps(mdsc, session, le32_to_cpu(h->max_caps));
2341 break;
2342
2343 default:
2344 pr_err("mdsc_handle_session bad op %d mds%d\n", op, mds);
2345 WARN_ON(1);
2346 }
2347
2348 mutex_unlock(&session->s_mutex);
2349 if (wake) {
2350 mutex_lock(&mdsc->mutex);
2351 __wake_requests(mdsc, &session->s_waiting);
2352 mutex_unlock(&mdsc->mutex);
2353 }
2354 return;
2355
2356bad:
2357 pr_err("mdsc_handle_session corrupt message mds%d len %d\n", mds,
2358 (int)msg->front.iov_len);
2359 ceph_msg_dump(msg);
2360 return;
2361}
2362
2363
2364/*
2365 * called under session->mutex.
2366 */
2367static void replay_unsafe_requests(struct ceph_mds_client *mdsc,
2368 struct ceph_mds_session *session)
2369{
2370 struct ceph_mds_request *req, *nreq;
2371 int err;
2372
2373 dout("replay_unsafe_requests mds%d\n", session->s_mds);
2374
2375 mutex_lock(&mdsc->mutex);
2376 list_for_each_entry_safe(req, nreq, &session->s_unsafe, r_unsafe_item) {
2377 err = __prepare_send_request(mdsc, req, session->s_mds);
2378 if (!err) {
2379 ceph_msg_get(req->r_request);
2380 ceph_con_send(&session->s_con, req->r_request);
2381 }
2382 }
2383 mutex_unlock(&mdsc->mutex);
2384}
2385
2386/*
2387 * Encode information about a cap for a reconnect with the MDS.
2388 */
2389static int encode_caps_cb(struct inode *inode, struct ceph_cap *cap,
2390 void *arg)
2391{
2392 union {
2393 struct ceph_mds_cap_reconnect v2;
2394 struct ceph_mds_cap_reconnect_v1 v1;
2395 } rec;
2396 size_t reclen;
2397 struct ceph_inode_info *ci;
2398 struct ceph_reconnect_state *recon_state = arg;
2399 struct ceph_pagelist *pagelist = recon_state->pagelist;
2400 char *path;
2401 int pathlen, err;
2402 u64 pathbase;
2403 struct dentry *dentry;
2404
2405 ci = cap->ci;
2406
2407 dout(" adding %p ino %llx.%llx cap %p %lld %s\n",
2408 inode, ceph_vinop(inode), cap, cap->cap_id,
2409 ceph_cap_string(cap->issued));
2410 err = ceph_pagelist_encode_64(pagelist, ceph_ino(inode));
2411 if (err)
2412 return err;
2413
2414 dentry = d_find_alias(inode);
2415 if (dentry) {
2416 path = ceph_mdsc_build_path(dentry, &pathlen, &pathbase, 0);
2417 if (IS_ERR(path)) {
2418 err = PTR_ERR(path);
2419 goto out_dput;
2420 }
2421 } else {
2422 path = NULL;
2423 pathlen = 0;
2424 }
2425 err = ceph_pagelist_encode_string(pagelist, path, pathlen);
2426 if (err)
2427 goto out_free;
2428
2429 spin_lock(&ci->i_ceph_lock);
2430 cap->seq = 0; /* reset cap seq */
2431 cap->issue_seq = 0; /* and issue_seq */
2432
2433 if (recon_state->flock) {
2434 rec.v2.cap_id = cpu_to_le64(cap->cap_id);
2435 rec.v2.wanted = cpu_to_le32(__ceph_caps_wanted(ci));
2436 rec.v2.issued = cpu_to_le32(cap->issued);
2437 rec.v2.snaprealm = cpu_to_le64(ci->i_snap_realm->ino);
2438 rec.v2.pathbase = cpu_to_le64(pathbase);
2439 rec.v2.flock_len = 0;
2440 reclen = sizeof(rec.v2);
2441 } else {
2442 rec.v1.cap_id = cpu_to_le64(cap->cap_id);
2443 rec.v1.wanted = cpu_to_le32(__ceph_caps_wanted(ci));
2444 rec.v1.issued = cpu_to_le32(cap->issued);
2445 rec.v1.size = cpu_to_le64(inode->i_size);
2446 ceph_encode_timespec(&rec.v1.mtime, &inode->i_mtime);
2447 ceph_encode_timespec(&rec.v1.atime, &inode->i_atime);
2448 rec.v1.snaprealm = cpu_to_le64(ci->i_snap_realm->ino);
2449 rec.v1.pathbase = cpu_to_le64(pathbase);
2450 reclen = sizeof(rec.v1);
2451 }
2452 spin_unlock(&ci->i_ceph_lock);
2453
2454 if (recon_state->flock) {
2455 int num_fcntl_locks, num_flock_locks;
2456 struct ceph_pagelist_cursor trunc_point;
2457
2458 ceph_pagelist_set_cursor(pagelist, &trunc_point);
2459 do {
2460 lock_flocks();
2461 ceph_count_locks(inode, &num_fcntl_locks,
2462 &num_flock_locks);
2463 rec.v2.flock_len = (2*sizeof(u32) +
2464 (num_fcntl_locks+num_flock_locks) *
2465 sizeof(struct ceph_filelock));
2466 unlock_flocks();
2467
2468 /* pre-alloc pagelist */
2469 ceph_pagelist_truncate(pagelist, &trunc_point);
2470 err = ceph_pagelist_append(pagelist, &rec, reclen);
2471 if (!err)
2472 err = ceph_pagelist_reserve(pagelist,
2473 rec.v2.flock_len);
2474
2475 /* encode locks */
2476 if (!err) {
2477 lock_flocks();
2478 err = ceph_encode_locks(inode,
2479 pagelist,
2480 num_fcntl_locks,
2481 num_flock_locks);
2482 unlock_flocks();
2483 }
2484 } while (err == -ENOSPC);
2485 } else {
2486 err = ceph_pagelist_append(pagelist, &rec, reclen);
2487 }
2488
2489out_free:
2490 kfree(path);
2491out_dput:
2492 dput(dentry);
2493 return err;
2494}
2495
2496
2497/*
2498 * If an MDS fails and recovers, clients need to reconnect in order to
2499 * reestablish shared state. This includes all caps issued through
2500 * this session _and_ the snap_realm hierarchy. Because it's not
2501 * clear which snap realms the mds cares about, we send everything we
2502 * know about.. that ensures we'll then get any new info the
2503 * recovering MDS might have.
2504 *
2505 * This is a relatively heavyweight operation, but it's rare.
2506 *
2507 * called with mdsc->mutex held.
2508 */
2509static void send_mds_reconnect(struct ceph_mds_client *mdsc,
2510 struct ceph_mds_session *session)
2511{
2512 struct ceph_msg *reply;
2513 struct rb_node *p;
2514 int mds = session->s_mds;
2515 int err = -ENOMEM;
2516 struct ceph_pagelist *pagelist;
2517 struct ceph_reconnect_state recon_state;
2518
2519 pr_info("mds%d reconnect start\n", mds);
2520
2521 pagelist = kmalloc(sizeof(*pagelist), GFP_NOFS);
2522 if (!pagelist)
2523 goto fail_nopagelist;
2524 ceph_pagelist_init(pagelist);
2525
2526 reply = ceph_msg_new(CEPH_MSG_CLIENT_RECONNECT, 0, GFP_NOFS, false);
2527 if (!reply)
2528 goto fail_nomsg;
2529
2530 mutex_lock(&session->s_mutex);
2531 session->s_state = CEPH_MDS_SESSION_RECONNECTING;
2532 session->s_seq = 0;
2533
2534 ceph_con_open(&session->s_con,
2535 ceph_mdsmap_get_addr(mdsc->mdsmap, mds));
2536
2537 /* replay unsafe requests */
2538 replay_unsafe_requests(mdsc, session);
2539
2540 down_read(&mdsc->snap_rwsem);
2541
2542 dout("session %p state %s\n", session,
2543 session_state_name(session->s_state));
2544
2545 /* drop old cap expires; we're about to reestablish that state */
2546 discard_cap_releases(mdsc, session);
2547
2548 /* traverse this session's caps */
2549 err = ceph_pagelist_encode_32(pagelist, session->s_nr_caps);
2550 if (err)
2551 goto fail;
2552
2553 recon_state.pagelist = pagelist;
2554 recon_state.flock = session->s_con.peer_features & CEPH_FEATURE_FLOCK;
2555 err = iterate_session_caps(session, encode_caps_cb, &recon_state);
2556 if (err < 0)
2557 goto fail;
2558
2559 /*
2560 * snaprealms. we provide mds with the ino, seq (version), and
2561 * parent for all of our realms. If the mds has any newer info,
2562 * it will tell us.
2563 */
2564 for (p = rb_first(&mdsc->snap_realms); p; p = rb_next(p)) {
2565 struct ceph_snap_realm *realm =
2566 rb_entry(p, struct ceph_snap_realm, node);
2567 struct ceph_mds_snaprealm_reconnect sr_rec;
2568
2569 dout(" adding snap realm %llx seq %lld parent %llx\n",
2570 realm->ino, realm->seq, realm->parent_ino);
2571 sr_rec.ino = cpu_to_le64(realm->ino);
2572 sr_rec.seq = cpu_to_le64(realm->seq);
2573 sr_rec.parent = cpu_to_le64(realm->parent_ino);
2574 err = ceph_pagelist_append(pagelist, &sr_rec, sizeof(sr_rec));
2575 if (err)
2576 goto fail;
2577 }
2578
2579 reply->pagelist = pagelist;
2580 if (recon_state.flock)
2581 reply->hdr.version = cpu_to_le16(2);
2582 reply->hdr.data_len = cpu_to_le32(pagelist->length);
2583 reply->nr_pages = calc_pages_for(0, pagelist->length);
2584 ceph_con_send(&session->s_con, reply);
2585
2586 mutex_unlock(&session->s_mutex);
2587
2588 mutex_lock(&mdsc->mutex);
2589 __wake_requests(mdsc, &session->s_waiting);
2590 mutex_unlock(&mdsc->mutex);
2591
2592 up_read(&mdsc->snap_rwsem);
2593 return;
2594
2595fail:
2596 ceph_msg_put(reply);
2597 up_read(&mdsc->snap_rwsem);
2598 mutex_unlock(&session->s_mutex);
2599fail_nomsg:
2600 ceph_pagelist_release(pagelist);
2601 kfree(pagelist);
2602fail_nopagelist:
2603 pr_err("error %d preparing reconnect for mds%d\n", err, mds);
2604 return;
2605}
2606
2607
2608/*
2609 * compare old and new mdsmaps, kicking requests
2610 * and closing out old connections as necessary
2611 *
2612 * called under mdsc->mutex.
2613 */
2614static void check_new_map(struct ceph_mds_client *mdsc,
2615 struct ceph_mdsmap *newmap,
2616 struct ceph_mdsmap *oldmap)
2617{
2618 int i;
2619 int oldstate, newstate;
2620 struct ceph_mds_session *s;
2621
2622 dout("check_new_map new %u old %u\n",
2623 newmap->m_epoch, oldmap->m_epoch);
2624
2625 for (i = 0; i < oldmap->m_max_mds && i < mdsc->max_sessions; i++) {
2626 if (mdsc->sessions[i] == NULL)
2627 continue;
2628 s = mdsc->sessions[i];
2629 oldstate = ceph_mdsmap_get_state(oldmap, i);
2630 newstate = ceph_mdsmap_get_state(newmap, i);
2631
2632 dout("check_new_map mds%d state %s%s -> %s%s (session %s)\n",
2633 i, ceph_mds_state_name(oldstate),
2634 ceph_mdsmap_is_laggy(oldmap, i) ? " (laggy)" : "",
2635 ceph_mds_state_name(newstate),
2636 ceph_mdsmap_is_laggy(newmap, i) ? " (laggy)" : "",
2637 session_state_name(s->s_state));
2638
2639 if (memcmp(ceph_mdsmap_get_addr(oldmap, i),
2640 ceph_mdsmap_get_addr(newmap, i),
2641 sizeof(struct ceph_entity_addr))) {
2642 if (s->s_state == CEPH_MDS_SESSION_OPENING) {
2643 /* the session never opened, just close it
2644 * out now */
2645 __wake_requests(mdsc, &s->s_waiting);
2646 __unregister_session(mdsc, s);
2647 } else {
2648 /* just close it */
2649 mutex_unlock(&mdsc->mutex);
2650 mutex_lock(&s->s_mutex);
2651 mutex_lock(&mdsc->mutex);
2652 ceph_con_close(&s->s_con);
2653 mutex_unlock(&s->s_mutex);
2654 s->s_state = CEPH_MDS_SESSION_RESTARTING;
2655 }
2656
2657 /* kick any requests waiting on the recovering mds */
2658 kick_requests(mdsc, i);
2659 } else if (oldstate == newstate) {
2660 continue; /* nothing new with this mds */
2661 }
2662
2663 /*
2664 * send reconnect?
2665 */
2666 if (s->s_state == CEPH_MDS_SESSION_RESTARTING &&
2667 newstate >= CEPH_MDS_STATE_RECONNECT) {
2668 mutex_unlock(&mdsc->mutex);
2669 send_mds_reconnect(mdsc, s);
2670 mutex_lock(&mdsc->mutex);
2671 }
2672
2673 /*
2674 * kick request on any mds that has gone active.
2675 */
2676 if (oldstate < CEPH_MDS_STATE_ACTIVE &&
2677 newstate >= CEPH_MDS_STATE_ACTIVE) {
2678 if (oldstate != CEPH_MDS_STATE_CREATING &&
2679 oldstate != CEPH_MDS_STATE_STARTING)
2680 pr_info("mds%d recovery completed\n", s->s_mds);
2681 kick_requests(mdsc, i);
2682 ceph_kick_flushing_caps(mdsc, s);
2683 wake_up_session_caps(s, 1);
2684 }
2685 }
2686
2687 for (i = 0; i < newmap->m_max_mds && i < mdsc->max_sessions; i++) {
2688 s = mdsc->sessions[i];
2689 if (!s)
2690 continue;
2691 if (!ceph_mdsmap_is_laggy(newmap, i))
2692 continue;
2693 if (s->s_state == CEPH_MDS_SESSION_OPEN ||
2694 s->s_state == CEPH_MDS_SESSION_HUNG ||
2695 s->s_state == CEPH_MDS_SESSION_CLOSING) {
2696 dout(" connecting to export targets of laggy mds%d\n",
2697 i);
2698 __open_export_target_sessions(mdsc, s);
2699 }
2700 }
2701}
2702
2703
2704
2705/*
2706 * leases
2707 */
2708
2709/*
2710 * caller must hold session s_mutex, dentry->d_lock
2711 */
2712void __ceph_mdsc_drop_dentry_lease(struct dentry *dentry)
2713{
2714 struct ceph_dentry_info *di = ceph_dentry(dentry);
2715
2716 ceph_put_mds_session(di->lease_session);
2717 di->lease_session = NULL;
2718}
2719
2720static void handle_lease(struct ceph_mds_client *mdsc,
2721 struct ceph_mds_session *session,
2722 struct ceph_msg *msg)
2723{
2724 struct super_block *sb = mdsc->fsc->sb;
2725 struct inode *inode;
2726 struct dentry *parent, *dentry;
2727 struct ceph_dentry_info *di;
2728 int mds = session->s_mds;
2729 struct ceph_mds_lease *h = msg->front.iov_base;
2730 u32 seq;
2731 struct ceph_vino vino;
2732 struct qstr dname;
2733 int release = 0;
2734
2735 dout("handle_lease from mds%d\n", mds);
2736
2737 /* decode */
2738 if (msg->front.iov_len < sizeof(*h) + sizeof(u32))
2739 goto bad;
2740 vino.ino = le64_to_cpu(h->ino);
2741 vino.snap = CEPH_NOSNAP;
2742 seq = le32_to_cpu(h->seq);
2743 dname.name = (void *)h + sizeof(*h) + sizeof(u32);
2744 dname.len = msg->front.iov_len - sizeof(*h) - sizeof(u32);
2745 if (dname.len != get_unaligned_le32(h+1))
2746 goto bad;
2747
2748 mutex_lock(&session->s_mutex);
2749 session->s_seq++;
2750
2751 /* lookup inode */
2752 inode = ceph_find_inode(sb, vino);
2753 dout("handle_lease %s, ino %llx %p %.*s\n",
2754 ceph_lease_op_name(h->action), vino.ino, inode,
2755 dname.len, dname.name);
2756 if (inode == NULL) {
2757 dout("handle_lease no inode %llx\n", vino.ino);
2758 goto release;
2759 }
2760
2761 /* dentry */
2762 parent = d_find_alias(inode);
2763 if (!parent) {
2764 dout("no parent dentry on inode %p\n", inode);
2765 WARN_ON(1);
2766 goto release; /* hrm... */
2767 }
2768 dname.hash = full_name_hash(dname.name, dname.len);
2769 dentry = d_lookup(parent, &dname);
2770 dput(parent);
2771 if (!dentry)
2772 goto release;
2773
2774 spin_lock(&dentry->d_lock);
2775 di = ceph_dentry(dentry);
2776 switch (h->action) {
2777 case CEPH_MDS_LEASE_REVOKE:
2778 if (di->lease_session == session) {
2779 if (ceph_seq_cmp(di->lease_seq, seq) > 0)
2780 h->seq = cpu_to_le32(di->lease_seq);
2781 __ceph_mdsc_drop_dentry_lease(dentry);
2782 }
2783 release = 1;
2784 break;
2785
2786 case CEPH_MDS_LEASE_RENEW:
2787 if (di->lease_session == session &&
2788 di->lease_gen == session->s_cap_gen &&
2789 di->lease_renew_from &&
2790 di->lease_renew_after == 0) {
2791 unsigned long duration =
2792 le32_to_cpu(h->duration_ms) * HZ / 1000;
2793
2794 di->lease_seq = seq;
2795 dentry->d_time = di->lease_renew_from + duration;
2796 di->lease_renew_after = di->lease_renew_from +
2797 (duration >> 1);
2798 di->lease_renew_from = 0;
2799 }
2800 break;
2801 }
2802 spin_unlock(&dentry->d_lock);
2803 dput(dentry);
2804
2805 if (!release)
2806 goto out;
2807
2808release:
2809 /* let's just reuse the same message */
2810 h->action = CEPH_MDS_LEASE_REVOKE_ACK;
2811 ceph_msg_get(msg);
2812 ceph_con_send(&session->s_con, msg);
2813
2814out:
2815 iput(inode);
2816 mutex_unlock(&session->s_mutex);
2817 return;
2818
2819bad:
2820 pr_err("corrupt lease message\n");
2821 ceph_msg_dump(msg);
2822}
2823
2824void ceph_mdsc_lease_send_msg(struct ceph_mds_session *session,
2825 struct inode *inode,
2826 struct dentry *dentry, char action,
2827 u32 seq)
2828{
2829 struct ceph_msg *msg;
2830 struct ceph_mds_lease *lease;
2831 int len = sizeof(*lease) + sizeof(u32);
2832 int dnamelen = 0;
2833
2834 dout("lease_send_msg inode %p dentry %p %s to mds%d\n",
2835 inode, dentry, ceph_lease_op_name(action), session->s_mds);
2836 dnamelen = dentry->d_name.len;
2837 len += dnamelen;
2838
2839 msg = ceph_msg_new(CEPH_MSG_CLIENT_LEASE, len, GFP_NOFS, false);
2840 if (!msg)
2841 return;
2842 lease = msg->front.iov_base;
2843 lease->action = action;
2844 lease->ino = cpu_to_le64(ceph_vino(inode).ino);
2845 lease->first = lease->last = cpu_to_le64(ceph_vino(inode).snap);
2846 lease->seq = cpu_to_le32(seq);
2847 put_unaligned_le32(dnamelen, lease + 1);
2848 memcpy((void *)(lease + 1) + 4, dentry->d_name.name, dnamelen);
2849
2850 /*
2851 * if this is a preemptive lease RELEASE, no need to
2852 * flush request stream, since the actual request will
2853 * soon follow.
2854 */
2855 msg->more_to_follow = (action == CEPH_MDS_LEASE_RELEASE);
2856
2857 ceph_con_send(&session->s_con, msg);
2858}
2859
2860/*
2861 * Preemptively release a lease we expect to invalidate anyway.
2862 * Pass @inode always, @dentry is optional.
2863 */
2864void ceph_mdsc_lease_release(struct ceph_mds_client *mdsc, struct inode *inode,
2865 struct dentry *dentry)
2866{
2867 struct ceph_dentry_info *di;
2868 struct ceph_mds_session *session;
2869 u32 seq;
2870
2871 BUG_ON(inode == NULL);
2872 BUG_ON(dentry == NULL);
2873
2874 /* is dentry lease valid? */
2875 spin_lock(&dentry->d_lock);
2876 di = ceph_dentry(dentry);
2877 if (!di || !di->lease_session ||
2878 di->lease_session->s_mds < 0 ||
2879 di->lease_gen != di->lease_session->s_cap_gen ||
2880 !time_before(jiffies, dentry->d_time)) {
2881 dout("lease_release inode %p dentry %p -- "
2882 "no lease\n",
2883 inode, dentry);
2884 spin_unlock(&dentry->d_lock);
2885 return;
2886 }
2887
2888 /* we do have a lease on this dentry; note mds and seq */
2889 session = ceph_get_mds_session(di->lease_session);
2890 seq = di->lease_seq;
2891 __ceph_mdsc_drop_dentry_lease(dentry);
2892 spin_unlock(&dentry->d_lock);
2893
2894 dout("lease_release inode %p dentry %p to mds%d\n",
2895 inode, dentry, session->s_mds);
2896 ceph_mdsc_lease_send_msg(session, inode, dentry,
2897 CEPH_MDS_LEASE_RELEASE, seq);
2898 ceph_put_mds_session(session);
2899}
2900
2901/*
2902 * drop all leases (and dentry refs) in preparation for umount
2903 */
2904static void drop_leases(struct ceph_mds_client *mdsc)
2905{
2906 int i;
2907
2908 dout("drop_leases\n");
2909 mutex_lock(&mdsc->mutex);
2910 for (i = 0; i < mdsc->max_sessions; i++) {
2911 struct ceph_mds_session *s = __ceph_lookup_mds_session(mdsc, i);
2912 if (!s)
2913 continue;
2914 mutex_unlock(&mdsc->mutex);
2915 mutex_lock(&s->s_mutex);
2916 mutex_unlock(&s->s_mutex);
2917 ceph_put_mds_session(s);
2918 mutex_lock(&mdsc->mutex);
2919 }
2920 mutex_unlock(&mdsc->mutex);
2921}
2922
2923
2924
2925/*
2926 * delayed work -- periodically trim expired leases, renew caps with mds
2927 */
2928static void schedule_delayed(struct ceph_mds_client *mdsc)
2929{
2930 int delay = 5;
2931 unsigned hz = round_jiffies_relative(HZ * delay);
2932 schedule_delayed_work(&mdsc->delayed_work, hz);
2933}
2934
2935static void delayed_work(struct work_struct *work)
2936{
2937 int i;
2938 struct ceph_mds_client *mdsc =
2939 container_of(work, struct ceph_mds_client, delayed_work.work);
2940 int renew_interval;
2941 int renew_caps;
2942
2943 dout("mdsc delayed_work\n");
2944 ceph_check_delayed_caps(mdsc);
2945
2946 mutex_lock(&mdsc->mutex);
2947 renew_interval = mdsc->mdsmap->m_session_timeout >> 2;
2948 renew_caps = time_after_eq(jiffies, HZ*renew_interval +
2949 mdsc->last_renew_caps);
2950 if (renew_caps)
2951 mdsc->last_renew_caps = jiffies;
2952
2953 for (i = 0; i < mdsc->max_sessions; i++) {
2954 struct ceph_mds_session *s = __ceph_lookup_mds_session(mdsc, i);
2955 if (s == NULL)
2956 continue;
2957 if (s->s_state == CEPH_MDS_SESSION_CLOSING) {
2958 dout("resending session close request for mds%d\n",
2959 s->s_mds);
2960 request_close_session(mdsc, s);
2961 ceph_put_mds_session(s);
2962 continue;
2963 }
2964 if (s->s_ttl && time_after(jiffies, s->s_ttl)) {
2965 if (s->s_state == CEPH_MDS_SESSION_OPEN) {
2966 s->s_state = CEPH_MDS_SESSION_HUNG;
2967 pr_info("mds%d hung\n", s->s_mds);
2968 }
2969 }
2970 if (s->s_state < CEPH_MDS_SESSION_OPEN) {
2971 /* this mds is failed or recovering, just wait */
2972 ceph_put_mds_session(s);
2973 continue;
2974 }
2975 mutex_unlock(&mdsc->mutex);
2976
2977 mutex_lock(&s->s_mutex);
2978 if (renew_caps)
2979 send_renew_caps(mdsc, s);
2980 else
2981 ceph_con_keepalive(&s->s_con);
2982 ceph_add_cap_releases(mdsc, s);
2983 if (s->s_state == CEPH_MDS_SESSION_OPEN ||
2984 s->s_state == CEPH_MDS_SESSION_HUNG)
2985 ceph_send_cap_releases(mdsc, s);
2986 mutex_unlock(&s->s_mutex);
2987 ceph_put_mds_session(s);
2988
2989 mutex_lock(&mdsc->mutex);
2990 }
2991 mutex_unlock(&mdsc->mutex);
2992
2993 schedule_delayed(mdsc);
2994}
2995
2996int ceph_mdsc_init(struct ceph_fs_client *fsc)
2997
2998{
2999 struct ceph_mds_client *mdsc;
3000
3001 mdsc = kzalloc(sizeof(struct ceph_mds_client), GFP_NOFS);
3002 if (!mdsc)
3003 return -ENOMEM;
3004 mdsc->fsc = fsc;
3005 fsc->mdsc = mdsc;
3006 mutex_init(&mdsc->mutex);
3007 mdsc->mdsmap = kzalloc(sizeof(*mdsc->mdsmap), GFP_NOFS);
3008 if (mdsc->mdsmap == NULL)
3009 return -ENOMEM;
3010
3011 init_completion(&mdsc->safe_umount_waiters);
3012 init_waitqueue_head(&mdsc->session_close_wq);
3013 INIT_LIST_HEAD(&mdsc->waiting_for_map);
3014 mdsc->sessions = NULL;
3015 mdsc->max_sessions = 0;
3016 mdsc->stopping = 0;
3017 init_rwsem(&mdsc->snap_rwsem);
3018 mdsc->snap_realms = RB_ROOT;
3019 INIT_LIST_HEAD(&mdsc->snap_empty);
3020 spin_lock_init(&mdsc->snap_empty_lock);
3021 mdsc->last_tid = 0;
3022 mdsc->request_tree = RB_ROOT;
3023 INIT_DELAYED_WORK(&mdsc->delayed_work, delayed_work);
3024 mdsc->last_renew_caps = jiffies;
3025 INIT_LIST_HEAD(&mdsc->cap_delay_list);
3026 spin_lock_init(&mdsc->cap_delay_lock);
3027 INIT_LIST_HEAD(&mdsc->snap_flush_list);
3028 spin_lock_init(&mdsc->snap_flush_lock);
3029 mdsc->cap_flush_seq = 0;
3030 INIT_LIST_HEAD(&mdsc->cap_dirty);
3031 INIT_LIST_HEAD(&mdsc->cap_dirty_migrating);
3032 mdsc->num_cap_flushing = 0;
3033 spin_lock_init(&mdsc->cap_dirty_lock);
3034 init_waitqueue_head(&mdsc->cap_flushing_wq);
3035 spin_lock_init(&mdsc->dentry_lru_lock);
3036 INIT_LIST_HEAD(&mdsc->dentry_lru);
3037
3038 ceph_caps_init(mdsc);
3039 ceph_adjust_min_caps(mdsc, fsc->min_caps);
3040
3041 return 0;
3042}
3043
3044/*
3045 * Wait for safe replies on open mds requests. If we time out, drop
3046 * all requests from the tree to avoid dangling dentry refs.
3047 */
3048static void wait_requests(struct ceph_mds_client *mdsc)
3049{
3050 struct ceph_mds_request *req;
3051 struct ceph_fs_client *fsc = mdsc->fsc;
3052
3053 mutex_lock(&mdsc->mutex);
3054 if (__get_oldest_req(mdsc)) {
3055 mutex_unlock(&mdsc->mutex);
3056
3057 dout("wait_requests waiting for requests\n");
3058 wait_for_completion_timeout(&mdsc->safe_umount_waiters,
3059 fsc->client->options->mount_timeout * HZ);
3060
3061 /* tear down remaining requests */
3062 mutex_lock(&mdsc->mutex);
3063 while ((req = __get_oldest_req(mdsc))) {
3064 dout("wait_requests timed out on tid %llu\n",
3065 req->r_tid);
3066 __unregister_request(mdsc, req);
3067 }
3068 }
3069 mutex_unlock(&mdsc->mutex);
3070 dout("wait_requests done\n");
3071}
3072
3073/*
3074 * called before mount is ro, and before dentries are torn down.
3075 * (hmm, does this still race with new lookups?)
3076 */
3077void ceph_mdsc_pre_umount(struct ceph_mds_client *mdsc)
3078{
3079 dout("pre_umount\n");
3080 mdsc->stopping = 1;
3081
3082 drop_leases(mdsc);
3083 ceph_flush_dirty_caps(mdsc);
3084 wait_requests(mdsc);
3085
3086 /*
3087 * wait for reply handlers to drop their request refs and
3088 * their inode/dcache refs
3089 */
3090 ceph_msgr_flush();
3091}
3092
3093/*
3094 * wait for all write mds requests to flush.
3095 */
3096static void wait_unsafe_requests(struct ceph_mds_client *mdsc, u64 want_tid)
3097{
3098 struct ceph_mds_request *req = NULL, *nextreq;
3099 struct rb_node *n;
3100
3101 mutex_lock(&mdsc->mutex);
3102 dout("wait_unsafe_requests want %lld\n", want_tid);
3103restart:
3104 req = __get_oldest_req(mdsc);
3105 while (req && req->r_tid <= want_tid) {
3106 /* find next request */
3107 n = rb_next(&req->r_node);
3108 if (n)
3109 nextreq = rb_entry(n, struct ceph_mds_request, r_node);
3110 else
3111 nextreq = NULL;
3112 if ((req->r_op & CEPH_MDS_OP_WRITE)) {
3113 /* write op */
3114 ceph_mdsc_get_request(req);
3115 if (nextreq)
3116 ceph_mdsc_get_request(nextreq);
3117 mutex_unlock(&mdsc->mutex);
3118 dout("wait_unsafe_requests wait on %llu (want %llu)\n",
3119 req->r_tid, want_tid);
3120 wait_for_completion(&req->r_safe_completion);
3121 mutex_lock(&mdsc->mutex);
3122 ceph_mdsc_put_request(req);
3123 if (!nextreq)
3124 break; /* next dne before, so we're done! */
3125 if (RB_EMPTY_NODE(&nextreq->r_node)) {
3126 /* next request was removed from tree */
3127 ceph_mdsc_put_request(nextreq);
3128 goto restart;
3129 }
3130 ceph_mdsc_put_request(nextreq); /* won't go away */
3131 }
3132 req = nextreq;
3133 }
3134 mutex_unlock(&mdsc->mutex);
3135 dout("wait_unsafe_requests done\n");
3136}
3137
3138void ceph_mdsc_sync(struct ceph_mds_client *mdsc)
3139{
3140 u64 want_tid, want_flush;
3141
3142 if (mdsc->fsc->mount_state == CEPH_MOUNT_SHUTDOWN)
3143 return;
3144
3145 dout("sync\n");
3146 mutex_lock(&mdsc->mutex);
3147 want_tid = mdsc->last_tid;
3148 want_flush = mdsc->cap_flush_seq;
3149 mutex_unlock(&mdsc->mutex);
3150 dout("sync want tid %lld flush_seq %lld\n", want_tid, want_flush);
3151
3152 ceph_flush_dirty_caps(mdsc);
3153
3154 wait_unsafe_requests(mdsc, want_tid);
3155 wait_event(mdsc->cap_flushing_wq, check_cap_flush(mdsc, want_flush));
3156}
3157
3158/*
3159 * true if all sessions are closed, or we force unmount
3160 */
3161static bool done_closing_sessions(struct ceph_mds_client *mdsc)
3162{
3163 int i, n = 0;
3164
3165 if (mdsc->fsc->mount_state == CEPH_MOUNT_SHUTDOWN)
3166 return true;
3167
3168 mutex_lock(&mdsc->mutex);
3169 for (i = 0; i < mdsc->max_sessions; i++)
3170 if (mdsc->sessions[i])
3171 n++;
3172 mutex_unlock(&mdsc->mutex);
3173 return n == 0;
3174}
3175
3176/*
3177 * called after sb is ro.
3178 */
3179void ceph_mdsc_close_sessions(struct ceph_mds_client *mdsc)
3180{
3181 struct ceph_mds_session *session;
3182 int i;
3183 struct ceph_fs_client *fsc = mdsc->fsc;
3184 unsigned long timeout = fsc->client->options->mount_timeout * HZ;
3185
3186 dout("close_sessions\n");
3187
3188 /* close sessions */
3189 mutex_lock(&mdsc->mutex);
3190 for (i = 0; i < mdsc->max_sessions; i++) {
3191 session = __ceph_lookup_mds_session(mdsc, i);
3192 if (!session)
3193 continue;
3194 mutex_unlock(&mdsc->mutex);
3195 mutex_lock(&session->s_mutex);
3196 __close_session(mdsc, session);
3197 mutex_unlock(&session->s_mutex);
3198 ceph_put_mds_session(session);
3199 mutex_lock(&mdsc->mutex);
3200 }
3201 mutex_unlock(&mdsc->mutex);
3202
3203 dout("waiting for sessions to close\n");
3204 wait_event_timeout(mdsc->session_close_wq, done_closing_sessions(mdsc),
3205 timeout);
3206
3207 /* tear down remaining sessions */
3208 mutex_lock(&mdsc->mutex);
3209 for (i = 0; i < mdsc->max_sessions; i++) {
3210 if (mdsc->sessions[i]) {
3211 session = get_session(mdsc->sessions[i]);
3212 __unregister_session(mdsc, session);
3213 mutex_unlock(&mdsc->mutex);
3214 mutex_lock(&session->s_mutex);
3215 remove_session_caps(session);
3216 mutex_unlock(&session->s_mutex);
3217 ceph_put_mds_session(session);
3218 mutex_lock(&mdsc->mutex);
3219 }
3220 }
3221 WARN_ON(!list_empty(&mdsc->cap_delay_list));
3222 mutex_unlock(&mdsc->mutex);
3223
3224 ceph_cleanup_empty_realms(mdsc);
3225
3226 cancel_delayed_work_sync(&mdsc->delayed_work); /* cancel timer */
3227
3228 dout("stopped\n");
3229}
3230
3231static void ceph_mdsc_stop(struct ceph_mds_client *mdsc)
3232{
3233 dout("stop\n");
3234 cancel_delayed_work_sync(&mdsc->delayed_work); /* cancel timer */
3235 if (mdsc->mdsmap)
3236 ceph_mdsmap_destroy(mdsc->mdsmap);
3237 kfree(mdsc->sessions);
3238 ceph_caps_finalize(mdsc);
3239}
3240
3241void ceph_mdsc_destroy(struct ceph_fs_client *fsc)
3242{
3243 struct ceph_mds_client *mdsc = fsc->mdsc;
3244
3245 dout("mdsc_destroy %p\n", mdsc);
3246 ceph_mdsc_stop(mdsc);
3247
3248 /* flush out any connection work with references to us */
3249 ceph_msgr_flush();
3250
3251 fsc->mdsc = NULL;
3252 kfree(mdsc);
3253 dout("mdsc_destroy %p done\n", mdsc);
3254}
3255
3256
3257/*
3258 * handle mds map update.
3259 */
3260void ceph_mdsc_handle_map(struct ceph_mds_client *mdsc, struct ceph_msg *msg)
3261{
3262 u32 epoch;
3263 u32 maplen;
3264 void *p = msg->front.iov_base;
3265 void *end = p + msg->front.iov_len;
3266 struct ceph_mdsmap *newmap, *oldmap;
3267 struct ceph_fsid fsid;
3268 int err = -EINVAL;
3269
3270 ceph_decode_need(&p, end, sizeof(fsid)+2*sizeof(u32), bad);
3271 ceph_decode_copy(&p, &fsid, sizeof(fsid));
3272 if (ceph_check_fsid(mdsc->fsc->client, &fsid) < 0)
3273 return;
3274 epoch = ceph_decode_32(&p);
3275 maplen = ceph_decode_32(&p);
3276 dout("handle_map epoch %u len %d\n", epoch, (int)maplen);
3277
3278 /* do we need it? */
3279 ceph_monc_got_mdsmap(&mdsc->fsc->client->monc, epoch);
3280 mutex_lock(&mdsc->mutex);
3281 if (mdsc->mdsmap && epoch <= mdsc->mdsmap->m_epoch) {
3282 dout("handle_map epoch %u <= our %u\n",
3283 epoch, mdsc->mdsmap->m_epoch);
3284 mutex_unlock(&mdsc->mutex);
3285 return;
3286 }
3287
3288 newmap = ceph_mdsmap_decode(&p, end);
3289 if (IS_ERR(newmap)) {
3290 err = PTR_ERR(newmap);
3291 goto bad_unlock;
3292 }
3293
3294 /* swap into place */
3295 if (mdsc->mdsmap) {
3296 oldmap = mdsc->mdsmap;
3297 mdsc->mdsmap = newmap;
3298 check_new_map(mdsc, newmap, oldmap);
3299 ceph_mdsmap_destroy(oldmap);
3300 } else {
3301 mdsc->mdsmap = newmap; /* first mds map */
3302 }
3303 mdsc->fsc->sb->s_maxbytes = mdsc->mdsmap->m_max_file_size;
3304
3305 __wake_requests(mdsc, &mdsc->waiting_for_map);
3306
3307 mutex_unlock(&mdsc->mutex);
3308 schedule_delayed(mdsc);
3309 return;
3310
3311bad_unlock:
3312 mutex_unlock(&mdsc->mutex);
3313bad:
3314 pr_err("error decoding mdsmap %d\n", err);
3315 return;
3316}
3317
3318static struct ceph_connection *con_get(struct ceph_connection *con)
3319{
3320 struct ceph_mds_session *s = con->private;
3321
3322 if (get_session(s)) {
3323 dout("mdsc con_get %p ok (%d)\n", s, atomic_read(&s->s_ref));
3324 return con;
3325 }
3326 dout("mdsc con_get %p FAIL\n", s);
3327 return NULL;
3328}
3329
3330static void con_put(struct ceph_connection *con)
3331{
3332 struct ceph_mds_session *s = con->private;
3333
3334 dout("mdsc con_put %p (%d)\n", s, atomic_read(&s->s_ref) - 1);
3335 ceph_put_mds_session(s);
3336}
3337
3338/*
3339 * if the client is unresponsive for long enough, the mds will kill
3340 * the session entirely.
3341 */
3342static void peer_reset(struct ceph_connection *con)
3343{
3344 struct ceph_mds_session *s = con->private;
3345 struct ceph_mds_client *mdsc = s->s_mdsc;
3346
3347 pr_warning("mds%d closed our session\n", s->s_mds);
3348 send_mds_reconnect(mdsc, s);
3349}
3350
3351static void dispatch(struct ceph_connection *con, struct ceph_msg *msg)
3352{
3353 struct ceph_mds_session *s = con->private;
3354 struct ceph_mds_client *mdsc = s->s_mdsc;
3355 int type = le16_to_cpu(msg->hdr.type);
3356
3357 mutex_lock(&mdsc->mutex);
3358 if (__verify_registered_session(mdsc, s) < 0) {
3359 mutex_unlock(&mdsc->mutex);
3360 goto out;
3361 }
3362 mutex_unlock(&mdsc->mutex);
3363
3364 switch (type) {
3365 case CEPH_MSG_MDS_MAP:
3366 ceph_mdsc_handle_map(mdsc, msg);
3367 break;
3368 case CEPH_MSG_CLIENT_SESSION:
3369 handle_session(s, msg);
3370 break;
3371 case CEPH_MSG_CLIENT_REPLY:
3372 handle_reply(s, msg);
3373 break;
3374 case CEPH_MSG_CLIENT_REQUEST_FORWARD:
3375 handle_forward(mdsc, s, msg);
3376 break;
3377 case CEPH_MSG_CLIENT_CAPS:
3378 ceph_handle_caps(s, msg);
3379 break;
3380 case CEPH_MSG_CLIENT_SNAP:
3381 ceph_handle_snap(mdsc, s, msg);
3382 break;
3383 case CEPH_MSG_CLIENT_LEASE:
3384 handle_lease(mdsc, s, msg);
3385 break;
3386
3387 default:
3388 pr_err("received unknown message type %d %s\n", type,
3389 ceph_msg_type_name(type));
3390 }
3391out:
3392 ceph_msg_put(msg);
3393}
3394
3395/*
3396 * authentication
3397 */
3398
3399/*
3400 * Note: returned pointer is the address of a structure that's
3401 * managed separately. Caller must *not* attempt to free it.
3402 */
3403static struct ceph_auth_handshake *get_authorizer(struct ceph_connection *con,
3404 int *proto, int force_new)
3405{
3406 struct ceph_mds_session *s = con->private;
3407 struct ceph_mds_client *mdsc = s->s_mdsc;
3408 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
3409 struct ceph_auth_handshake *auth = &s->s_auth;
3410
3411 if (force_new && auth->authorizer) {
3412 if (ac->ops && ac->ops->destroy_authorizer)
3413 ac->ops->destroy_authorizer(ac, auth->authorizer);
3414 auth->authorizer = NULL;
3415 }
3416 if (!auth->authorizer && ac->ops && ac->ops->create_authorizer) {
3417 int ret = ac->ops->create_authorizer(ac, CEPH_ENTITY_TYPE_MDS,
3418 auth);
3419 if (ret)
3420 return ERR_PTR(ret);
3421 }
3422 *proto = ac->protocol;
3423
3424 return auth;
3425}
3426
3427
3428static int verify_authorizer_reply(struct ceph_connection *con, int len)
3429{
3430 struct ceph_mds_session *s = con->private;
3431 struct ceph_mds_client *mdsc = s->s_mdsc;
3432 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
3433
3434 return ac->ops->verify_authorizer_reply(ac, s->s_auth.authorizer, len);
3435}
3436
3437static int invalidate_authorizer(struct ceph_connection *con)
3438{
3439 struct ceph_mds_session *s = con->private;
3440 struct ceph_mds_client *mdsc = s->s_mdsc;
3441 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
3442
3443 if (ac->ops->invalidate_authorizer)
3444 ac->ops->invalidate_authorizer(ac, CEPH_ENTITY_TYPE_MDS);
3445
3446 return ceph_monc_validate_auth(&mdsc->fsc->client->monc);
3447}
3448
3449static const struct ceph_connection_operations mds_con_ops = {
3450 .get = con_get,
3451 .put = con_put,
3452 .dispatch = dispatch,
3453 .get_authorizer = get_authorizer,
3454 .verify_authorizer_reply = verify_authorizer_reply,
3455 .invalidate_authorizer = invalidate_authorizer,
3456 .peer_reset = peer_reset,
3457};
3458
3459/* eof */