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Merge tag 'block-5.11-2021-01-10' of git://git.kernel.dk/linux-block
[linux/fpc-iii.git] / fs / ceph / mds_client.c
blob840587037b59bcceefd8a715482c05249c3d3e88
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
15 #include "super.h"
16 #include "mds_client.h"
17
18 #include <linux/ceph/ceph_features.h>
19 #include <linux/ceph/messenger.h>
20 #include <linux/ceph/decode.h>
21 #include <linux/ceph/pagelist.h>
22 #include <linux/ceph/auth.h>
23 #include <linux/ceph/debugfs.h>
24
25 #define RECONNECT_MAX_SIZE (INT_MAX - PAGE_SIZE)
26
27 /*
28 * A cluster of MDS (metadata server) daemons is responsible for
29 * managing the file system namespace (the directory hierarchy and
30 * inodes) and for coordinating shared access to storage. Metadata is
31 * partitioning hierarchically across a number of servers, and that
32 * partition varies over time as the cluster adjusts the distribution
33 * in order to balance load.
34 *
35 * The MDS client is primarily responsible to managing synchronous
36 * metadata requests for operations like open, unlink, and so forth.
37 * If there is a MDS failure, we find out about it when we (possibly
38 * request and) receive a new MDS map, and can resubmit affected
39 * requests.
40 *
41 * For the most part, though, we take advantage of a lossless
42 * communications channel to the MDS, and do not need to worry about
43 * timing out or resubmitting requests.
44 *
45 * We maintain a stateful "session" with each MDS we interact with.
46 * Within each session, we sent periodic heartbeat messages to ensure
47 * any capabilities or leases we have been issues remain valid. If
48 * the session times out and goes stale, our leases and capabilities
49 * are no longer valid.
50 */
51
52 struct ceph_reconnect_state {
53 struct ceph_mds_session *session;
54 int nr_caps, nr_realms;
55 struct ceph_pagelist *pagelist;
56 unsigned msg_version;
57 bool allow_multi;
58 };
59
60 static void __wake_requests(struct ceph_mds_client *mdsc,
61 struct list_head *head);
62 static void ceph_cap_release_work(struct work_struct *work);
63 static void ceph_cap_reclaim_work(struct work_struct *work);
64
65 static const struct ceph_connection_operations mds_con_ops;
66
67
68 /*
69 * mds reply parsing
70 */
71
72 static int parse_reply_info_quota(void **p, void *end,
73 struct ceph_mds_reply_info_in *info)
74 {
75 u8 struct_v, struct_compat;
76 u32 struct_len;
77
78 ceph_decode_8_safe(p, end, struct_v, bad);
79 ceph_decode_8_safe(p, end, struct_compat, bad);
80 /* struct_v is expected to be >= 1. we only
81 * understand encoding with struct_compat == 1. */
82 if (!struct_v || struct_compat != 1)
83 goto bad;
84 ceph_decode_32_safe(p, end, struct_len, bad);
85 ceph_decode_need(p, end, struct_len, bad);
86 end = *p + struct_len;
87 ceph_decode_64_safe(p, end, info->max_bytes, bad);
88 ceph_decode_64_safe(p, end, info->max_files, bad);
89 *p = end;
90 return 0;
91 bad:
92 return -EIO;
93 }
94
95 /*
96 * parse individual inode info
97 */
98 static int parse_reply_info_in(void **p, void *end,
99 struct ceph_mds_reply_info_in *info,
100 u64 features)
101 {
102 int err = 0;
103 u8 struct_v = 0;
104
105 if (features == (u64)-1) {
106 u32 struct_len;
107 u8 struct_compat;
108 ceph_decode_8_safe(p, end, struct_v, bad);
109 ceph_decode_8_safe(p, end, struct_compat, bad);
110 /* struct_v is expected to be >= 1. we only understand
111 * encoding with struct_compat == 1. */
112 if (!struct_v || struct_compat != 1)
113 goto bad;
114 ceph_decode_32_safe(p, end, struct_len, bad);
115 ceph_decode_need(p, end, struct_len, bad);
116 end = *p + struct_len;
117 }
118
119 ceph_decode_need(p, end, sizeof(struct ceph_mds_reply_inode), bad);
120 info->in = *p;
121 *p += sizeof(struct ceph_mds_reply_inode) +
122 sizeof(*info->in->fragtree.splits) *
123 le32_to_cpu(info->in->fragtree.nsplits);
124
125 ceph_decode_32_safe(p, end, info->symlink_len, bad);
126 ceph_decode_need(p, end, info->symlink_len, bad);
127 info->symlink = *p;
128 *p += info->symlink_len;
129
130 ceph_decode_copy_safe(p, end, &info->dir_layout,
131 sizeof(info->dir_layout), bad);
132 ceph_decode_32_safe(p, end, info->xattr_len, bad);
133 ceph_decode_need(p, end, info->xattr_len, bad);
134 info->xattr_data = *p;
135 *p += info->xattr_len;
136
137 if (features == (u64)-1) {
138 /* inline data */
139 ceph_decode_64_safe(p, end, info->inline_version, bad);
140 ceph_decode_32_safe(p, end, info->inline_len, bad);
141 ceph_decode_need(p, end, info->inline_len, bad);
142 info->inline_data = *p;
143 *p += info->inline_len;
144 /* quota */
145 err = parse_reply_info_quota(p, end, info);
146 if (err < 0)
147 goto out_bad;
148 /* pool namespace */
149 ceph_decode_32_safe(p, end, info->pool_ns_len, bad);
150 if (info->pool_ns_len > 0) {
151 ceph_decode_need(p, end, info->pool_ns_len, bad);
152 info->pool_ns_data = *p;
153 *p += info->pool_ns_len;
154 }
155
156 /* btime */
157 ceph_decode_need(p, end, sizeof(info->btime), bad);
158 ceph_decode_copy(p, &info->btime, sizeof(info->btime));
159
160 /* change attribute */
161 ceph_decode_64_safe(p, end, info->change_attr, bad);
162
163 /* dir pin */
164 if (struct_v >= 2) {
165 ceph_decode_32_safe(p, end, info->dir_pin, bad);
166 } else {
167 info->dir_pin = -ENODATA;
168 }
169
170 /* snapshot birth time, remains zero for v<=2 */
171 if (struct_v >= 3) {
172 ceph_decode_need(p, end, sizeof(info->snap_btime), bad);
173 ceph_decode_copy(p, &info->snap_btime,
174 sizeof(info->snap_btime));
175 } else {
176 memset(&info->snap_btime, 0, sizeof(info->snap_btime));
177 }
178
179 *p = end;
180 } else {
181 if (features & CEPH_FEATURE_MDS_INLINE_DATA) {
182 ceph_decode_64_safe(p, end, info->inline_version, bad);
183 ceph_decode_32_safe(p, end, info->inline_len, bad);
184 ceph_decode_need(p, end, info->inline_len, bad);
185 info->inline_data = *p;
186 *p += info->inline_len;
187 } else
188 info->inline_version = CEPH_INLINE_NONE;
189
190 if (features & CEPH_FEATURE_MDS_QUOTA) {
191 err = parse_reply_info_quota(p, end, info);
192 if (err < 0)
193 goto out_bad;
194 } else {
195 info->max_bytes = 0;
196 info->max_files = 0;
197 }
198
199 info->pool_ns_len = 0;
200 info->pool_ns_data = NULL;
201 if (features & CEPH_FEATURE_FS_FILE_LAYOUT_V2) {
202 ceph_decode_32_safe(p, end, info->pool_ns_len, bad);
203 if (info->pool_ns_len > 0) {
204 ceph_decode_need(p, end, info->pool_ns_len, bad);
205 info->pool_ns_data = *p;
206 *p += info->pool_ns_len;
207 }
208 }
209
210 if (features & CEPH_FEATURE_FS_BTIME) {
211 ceph_decode_need(p, end, sizeof(info->btime), bad);
212 ceph_decode_copy(p, &info->btime, sizeof(info->btime));
213 ceph_decode_64_safe(p, end, info->change_attr, bad);
214 }
215
216 info->dir_pin = -ENODATA;
217 /* info->snap_btime remains zero */
218 }
219 return 0;
220 bad:
221 err = -EIO;
222 out_bad:
223 return err;
224 }
225
226 static int parse_reply_info_dir(void **p, void *end,
227 struct ceph_mds_reply_dirfrag **dirfrag,
228 u64 features)
229 {
230 if (features == (u64)-1) {
231 u8 struct_v, struct_compat;
232 u32 struct_len;
233 ceph_decode_8_safe(p, end, struct_v, bad);
234 ceph_decode_8_safe(p, end, struct_compat, bad);
235 /* struct_v is expected to be >= 1. we only understand
236 * encoding whose struct_compat == 1. */
237 if (!struct_v || struct_compat != 1)
238 goto bad;
239 ceph_decode_32_safe(p, end, struct_len, bad);
240 ceph_decode_need(p, end, struct_len, bad);
241 end = *p + struct_len;
242 }
243
244 ceph_decode_need(p, end, sizeof(**dirfrag), bad);
245 *dirfrag = *p;
246 *p += sizeof(**dirfrag) + sizeof(u32) * le32_to_cpu((*dirfrag)->ndist);
247 if (unlikely(*p > end))
248 goto bad;
249 if (features == (u64)-1)
250 *p = end;
251 return 0;
252 bad:
253 return -EIO;
254 }
255
256 static int parse_reply_info_lease(void **p, void *end,
257 struct ceph_mds_reply_lease **lease,
258 u64 features)
259 {
260 if (features == (u64)-1) {
261 u8 struct_v, struct_compat;
262 u32 struct_len;
263 ceph_decode_8_safe(p, end, struct_v, bad);
264 ceph_decode_8_safe(p, end, struct_compat, bad);
265 /* struct_v is expected to be >= 1. we only understand
266 * encoding whose struct_compat == 1. */
267 if (!struct_v || struct_compat != 1)
268 goto bad;
269 ceph_decode_32_safe(p, end, struct_len, bad);
270 ceph_decode_need(p, end, struct_len, bad);
271 end = *p + struct_len;
272 }
273
274 ceph_decode_need(p, end, sizeof(**lease), bad);
275 *lease = *p;
276 *p += sizeof(**lease);
277 if (features == (u64)-1)
278 *p = end;
279 return 0;
280 bad:
281 return -EIO;
282 }
283
284 /*
285 * parse a normal reply, which may contain a (dir+)dentry and/or a
286 * target inode.
287 */
288 static int parse_reply_info_trace(void **p, void *end,
289 struct ceph_mds_reply_info_parsed *info,
290 u64 features)
291 {
292 int err;
293
294 if (info->head->is_dentry) {
295 err = parse_reply_info_in(p, end, &info->diri, features);
296 if (err < 0)
297 goto out_bad;
298
299 err = parse_reply_info_dir(p, end, &info->dirfrag, features);
300 if (err < 0)
301 goto out_bad;
302
303 ceph_decode_32_safe(p, end, info->dname_len, bad);
304 ceph_decode_need(p, end, info->dname_len, bad);
305 info->dname = *p;
306 *p += info->dname_len;
307
308 err = parse_reply_info_lease(p, end, &info->dlease, features);
309 if (err < 0)
310 goto out_bad;
311 }
312
313 if (info->head->is_target) {
314 err = parse_reply_info_in(p, end, &info->targeti, features);
315 if (err < 0)
316 goto out_bad;
317 }
318
319 if (unlikely(*p != end))
320 goto bad;
321 return 0;
322
323 bad:
324 err = -EIO;
325 out_bad:
326 pr_err("problem parsing mds trace %d\n", err);
327 return err;
328 }
329
330 /*
331 * parse readdir results
332 */
333 static int parse_reply_info_readdir(void **p, void *end,
334 struct ceph_mds_reply_info_parsed *info,
335 u64 features)
336 {
337 u32 num, i = 0;
338 int err;
339
340 err = parse_reply_info_dir(p, end, &info->dir_dir, features);
341 if (err < 0)
342 goto out_bad;
343
344 ceph_decode_need(p, end, sizeof(num) + 2, bad);
345 num = ceph_decode_32(p);
346 {
347 u16 flags = ceph_decode_16(p);
348 info->dir_end = !!(flags & CEPH_READDIR_FRAG_END);
349 info->dir_complete = !!(flags & CEPH_READDIR_FRAG_COMPLETE);
350 info->hash_order = !!(flags & CEPH_READDIR_HASH_ORDER);
351 info->offset_hash = !!(flags & CEPH_READDIR_OFFSET_HASH);
352 }
353 if (num == 0)
354 goto done;
355
356 BUG_ON(!info->dir_entries);
357 if ((unsigned long)(info->dir_entries + num) >
358 (unsigned long)info->dir_entries + info->dir_buf_size) {
359 pr_err("dir contents are larger than expected\n");
360 WARN_ON(1);
361 goto bad;
362 }
363
364 info->dir_nr = num;
365 while (num) {
366 struct ceph_mds_reply_dir_entry *rde = info->dir_entries + i;
367 /* dentry */
368 ceph_decode_32_safe(p, end, rde->name_len, bad);
369 ceph_decode_need(p, end, rde->name_len, bad);
370 rde->name = *p;
371 *p += rde->name_len;
372 dout("parsed dir dname '%.*s'\n", rde->name_len, rde->name);
373
374 /* dentry lease */
375 err = parse_reply_info_lease(p, end, &rde->lease, features);
376 if (err)
377 goto out_bad;
378 /* inode */
379 err = parse_reply_info_in(p, end, &rde->inode, features);
380 if (err < 0)
381 goto out_bad;
382 /* ceph_readdir_prepopulate() will update it */
383 rde->offset = 0;
384 i++;
385 num--;
386 }
387
388 done:
389 /* Skip over any unrecognized fields */
390 *p = end;
391 return 0;
392
393 bad:
394 err = -EIO;
395 out_bad:
396 pr_err("problem parsing dir contents %d\n", err);
397 return err;
398 }
399
400 /*
401 * parse fcntl F_GETLK results
402 */
403 static int parse_reply_info_filelock(void **p, void *end,
404 struct ceph_mds_reply_info_parsed *info,
405 u64 features)
406 {
407 if (*p + sizeof(*info->filelock_reply) > end)
408 goto bad;
409
410 info->filelock_reply = *p;
411
412 /* Skip over any unrecognized fields */
413 *p = end;
414 return 0;
415 bad:
416 return -EIO;
417 }
418
419
420 #if BITS_PER_LONG == 64
421
422 #define DELEGATED_INO_AVAILABLE xa_mk_value(1)
423
424 static int ceph_parse_deleg_inos(void **p, void *end,
425 struct ceph_mds_session *s)
426 {
427 u32 sets;
428
429 ceph_decode_32_safe(p, end, sets, bad);
430 dout("got %u sets of delegated inodes\n", sets);
431 while (sets--) {
432 u64 start, len, ino;
433
434 ceph_decode_64_safe(p, end, start, bad);
435 ceph_decode_64_safe(p, end, len, bad);
436 while (len--) {
437 int err = xa_insert(&s->s_delegated_inos, ino = start++,
438 DELEGATED_INO_AVAILABLE,
439 GFP_KERNEL);
440 if (!err) {
441 dout("added delegated inode 0x%llx\n",
442 start - 1);
443 } else if (err == -EBUSY) {
444 pr_warn("ceph: MDS delegated inode 0x%llx more than once.\n",
445 start - 1);
446 } else {
447 return err;
448 }
449 }
450 }
451 return 0;
452 bad:
453 return -EIO;
454 }
455
456 u64 ceph_get_deleg_ino(struct ceph_mds_session *s)
457 {
458 unsigned long ino;
459 void *val;
460
461 xa_for_each(&s->s_delegated_inos, ino, val) {
462 val = xa_erase(&s->s_delegated_inos, ino);
463 if (val == DELEGATED_INO_AVAILABLE)
464 return ino;
465 }
466 return 0;
467 }
468
469 int ceph_restore_deleg_ino(struct ceph_mds_session *s, u64 ino)
470 {
471 return xa_insert(&s->s_delegated_inos, ino, DELEGATED_INO_AVAILABLE,
472 GFP_KERNEL);
473 }
474 #else /* BITS_PER_LONG == 64 */
475 /*
476 * FIXME: xarrays can't handle 64-bit indexes on a 32-bit arch. For now, just
477 * ignore delegated_inos on 32 bit arch. Maybe eventually add xarrays for top
478 * and bottom words?
479 */
480 static int ceph_parse_deleg_inos(void **p, void *end,
481 struct ceph_mds_session *s)
482 {
483 u32 sets;
484
485 ceph_decode_32_safe(p, end, sets, bad);
486 if (sets)
487 ceph_decode_skip_n(p, end, sets * 2 * sizeof(__le64), bad);
488 return 0;
489 bad:
490 return -EIO;
491 }
492
493 u64 ceph_get_deleg_ino(struct ceph_mds_session *s)
494 {
495 return 0;
496 }
497
498 int ceph_restore_deleg_ino(struct ceph_mds_session *s, u64 ino)
499 {
500 return 0;
501 }
502 #endif /* BITS_PER_LONG == 64 */
503
504 /*
505 * parse create results
506 */
507 static int parse_reply_info_create(void **p, void *end,
508 struct ceph_mds_reply_info_parsed *info,
509 u64 features, struct ceph_mds_session *s)
510 {
511 int ret;
512
513 if (features == (u64)-1 ||
514 (features & CEPH_FEATURE_REPLY_CREATE_INODE)) {
515 if (*p == end) {
516 /* Malformed reply? */
517 info->has_create_ino = false;
518 } else if (test_bit(CEPHFS_FEATURE_DELEG_INO, &s->s_features)) {
519 info->has_create_ino = true;
520 /* struct_v, struct_compat, and len */
521 ceph_decode_skip_n(p, end, 2 + sizeof(u32), bad);
522 ceph_decode_64_safe(p, end, info->ino, bad);
523 ret = ceph_parse_deleg_inos(p, end, s);
524 if (ret)
525 return ret;
526 } else {
527 /* legacy */
528 ceph_decode_64_safe(p, end, info->ino, bad);
529 info->has_create_ino = true;
530 }
531 } else {
532 if (*p != end)
533 goto bad;
534 }
535
536 /* Skip over any unrecognized fields */
537 *p = end;
538 return 0;
539 bad:
540 return -EIO;
541 }
542
543 /*
544 * parse extra results
545 */
546 static int parse_reply_info_extra(void **p, void *end,
547 struct ceph_mds_reply_info_parsed *info,
548 u64 features, struct ceph_mds_session *s)
549 {
550 u32 op = le32_to_cpu(info->head->op);
551
552 if (op == CEPH_MDS_OP_GETFILELOCK)
553 return parse_reply_info_filelock(p, end, info, features);
554 else if (op == CEPH_MDS_OP_READDIR || op == CEPH_MDS_OP_LSSNAP)
555 return parse_reply_info_readdir(p, end, info, features);
556 else if (op == CEPH_MDS_OP_CREATE)
557 return parse_reply_info_create(p, end, info, features, s);
558 else
559 return -EIO;
560 }
561
562 /*
563 * parse entire mds reply
564 */
565 static int parse_reply_info(struct ceph_mds_session *s, struct ceph_msg *msg,
566 struct ceph_mds_reply_info_parsed *info,
567 u64 features)
568 {
569 void *p, *end;
570 u32 len;
571 int err;
572
573 info->head = msg->front.iov_base;
574 p = msg->front.iov_base + sizeof(struct ceph_mds_reply_head);
575 end = p + msg->front.iov_len - sizeof(struct ceph_mds_reply_head);
576
577 /* trace */
578 ceph_decode_32_safe(&p, end, len, bad);
579 if (len > 0) {
580 ceph_decode_need(&p, end, len, bad);
581 err = parse_reply_info_trace(&p, p+len, info, features);
582 if (err < 0)
583 goto out_bad;
584 }
585
586 /* extra */
587 ceph_decode_32_safe(&p, end, len, bad);
588 if (len > 0) {
589 ceph_decode_need(&p, end, len, bad);
590 err = parse_reply_info_extra(&p, p+len, info, features, s);
591 if (err < 0)
592 goto out_bad;
593 }
594
595 /* snap blob */
596 ceph_decode_32_safe(&p, end, len, bad);
597 info->snapblob_len = len;
598 info->snapblob = p;
599 p += len;
600
601 if (p != end)
602 goto bad;
603 return 0;
604
605 bad:
606 err = -EIO;
607 out_bad:
608 pr_err("mds parse_reply err %d\n", err);
609 return err;
610 }
611
612 static void destroy_reply_info(struct ceph_mds_reply_info_parsed *info)
613 {
614 if (!info->dir_entries)
615 return;
616 free_pages((unsigned long)info->dir_entries, get_order(info->dir_buf_size));
617 }
618
619
620 /*
621 * sessions
622 */
623 const char *ceph_session_state_name(int s)
624 {
625 switch (s) {
626 case CEPH_MDS_SESSION_NEW: return "new";
627 case CEPH_MDS_SESSION_OPENING: return "opening";
628 case CEPH_MDS_SESSION_OPEN: return "open";
629 case CEPH_MDS_SESSION_HUNG: return "hung";
630 case CEPH_MDS_SESSION_CLOSING: return "closing";
631 case CEPH_MDS_SESSION_CLOSED: return "closed";
632 case CEPH_MDS_SESSION_RESTARTING: return "restarting";
633 case CEPH_MDS_SESSION_RECONNECTING: return "reconnecting";
634 case CEPH_MDS_SESSION_REJECTED: return "rejected";
635 default: return "???";
636 }
637 }
638
639 struct ceph_mds_session *ceph_get_mds_session(struct ceph_mds_session *s)
640 {
641 if (refcount_inc_not_zero(&s->s_ref)) {
642 dout("mdsc get_session %p %d -> %d\n", s,
643 refcount_read(&s->s_ref)-1, refcount_read(&s->s_ref));
644 return s;
645 } else {
646 dout("mdsc get_session %p 0 -- FAIL\n", s);
647 return NULL;
648 }
649 }
650
651 void ceph_put_mds_session(struct ceph_mds_session *s)
652 {
653 dout("mdsc put_session %p %d -> %d\n", s,
654 refcount_read(&s->s_ref), refcount_read(&s->s_ref)-1);
655 if (refcount_dec_and_test(&s->s_ref)) {
656 if (s->s_auth.authorizer)
657 ceph_auth_destroy_authorizer(s->s_auth.authorizer);
658 WARN_ON(mutex_is_locked(&s->s_mutex));
659 xa_destroy(&s->s_delegated_inos);
660 kfree(s);
661 }
662 }
663
664 /*
665 * called under mdsc->mutex
666 */
667 struct ceph_mds_session *__ceph_lookup_mds_session(struct ceph_mds_client *mdsc,
668 int mds)
669 {
670 if (mds >= mdsc->max_sessions || !mdsc->sessions[mds])
671 return NULL;
672 return ceph_get_mds_session(mdsc->sessions[mds]);
673 }
674
675 static bool __have_session(struct ceph_mds_client *mdsc, int mds)
676 {
677 if (mds >= mdsc->max_sessions || !mdsc->sessions[mds])
678 return false;
679 else
680 return true;
681 }
682
683 static int __verify_registered_session(struct ceph_mds_client *mdsc,
684 struct ceph_mds_session *s)
685 {
686 if (s->s_mds >= mdsc->max_sessions ||
687 mdsc->sessions[s->s_mds] != s)
688 return -ENOENT;
689 return 0;
690 }
691
692 /*
693 * create+register a new session for given mds.
694 * called under mdsc->mutex.
695 */
696 static struct ceph_mds_session *register_session(struct ceph_mds_client *mdsc,
697 int mds)
698 {
699 struct ceph_mds_session *s;
700
701 if (mds >= mdsc->mdsmap->possible_max_rank)
702 return ERR_PTR(-EINVAL);
703
704 s = kzalloc(sizeof(*s), GFP_NOFS);
705 if (!s)
706 return ERR_PTR(-ENOMEM);
707
708 if (mds >= mdsc->max_sessions) {
709 int newmax = 1 << get_count_order(mds + 1);
710 struct ceph_mds_session **sa;
711
712 dout("%s: realloc to %d\n", __func__, newmax);
713 sa = kcalloc(newmax, sizeof(void *), GFP_NOFS);
714 if (!sa)
715 goto fail_realloc;
716 if (mdsc->sessions) {
717 memcpy(sa, mdsc->sessions,
718 mdsc->max_sessions * sizeof(void *));
719 kfree(mdsc->sessions);
720 }
721 mdsc->sessions = sa;
722 mdsc->max_sessions = newmax;
723 }
724
725 dout("%s: mds%d\n", __func__, mds);
726 s->s_mdsc = mdsc;
727 s->s_mds = mds;
728 s->s_state = CEPH_MDS_SESSION_NEW;
729 s->s_ttl = 0;
730 s->s_seq = 0;
731 mutex_init(&s->s_mutex);
732
733 ceph_con_init(&s->s_con, s, &mds_con_ops, &mdsc->fsc->client->msgr);
734
735 spin_lock_init(&s->s_gen_ttl_lock);
736 s->s_cap_gen = 1;
737 s->s_cap_ttl = jiffies - 1;
738
739 spin_lock_init(&s->s_cap_lock);
740 s->s_renew_requested = 0;
741 s->s_renew_seq = 0;
742 INIT_LIST_HEAD(&s->s_caps);
743 s->s_nr_caps = 0;
744 refcount_set(&s->s_ref, 1);
745 INIT_LIST_HEAD(&s->s_waiting);
746 INIT_LIST_HEAD(&s->s_unsafe);
747 xa_init(&s->s_delegated_inos);
748 s->s_num_cap_releases = 0;
749 s->s_cap_reconnect = 0;
750 s->s_cap_iterator = NULL;
751 INIT_LIST_HEAD(&s->s_cap_releases);
752 INIT_WORK(&s->s_cap_release_work, ceph_cap_release_work);
753
754 INIT_LIST_HEAD(&s->s_cap_dirty);
755 INIT_LIST_HEAD(&s->s_cap_flushing);
756
757 mdsc->sessions[mds] = s;
758 atomic_inc(&mdsc->num_sessions);
759 refcount_inc(&s->s_ref); /* one ref to sessions[], one to caller */
760
761 ceph_con_open(&s->s_con, CEPH_ENTITY_TYPE_MDS, mds,
762 ceph_mdsmap_get_addr(mdsc->mdsmap, mds));
763
764 return s;
765
766 fail_realloc:
767 kfree(s);
768 return ERR_PTR(-ENOMEM);
769 }
770
771 /*
772 * called under mdsc->mutex
773 */
774 static void __unregister_session(struct ceph_mds_client *mdsc,
775 struct ceph_mds_session *s)
776 {
777 dout("__unregister_session mds%d %p\n", s->s_mds, s);
778 BUG_ON(mdsc->sessions[s->s_mds] != s);
779 mdsc->sessions[s->s_mds] = NULL;
780 ceph_con_close(&s->s_con);
781 ceph_put_mds_session(s);
782 atomic_dec(&mdsc->num_sessions);
783 }
784
785 /*
786 * drop session refs in request.
787 *
788 * should be last request ref, or hold mdsc->mutex
789 */
790 static void put_request_session(struct ceph_mds_request *req)
791 {
792 if (req->r_session) {
793 ceph_put_mds_session(req->r_session);
794 req->r_session = NULL;
795 }
796 }
797
798 void ceph_mdsc_release_request(struct kref *kref)
799 {
800 struct ceph_mds_request *req = container_of(kref,
801 struct ceph_mds_request,
802 r_kref);
803 ceph_mdsc_release_dir_caps_no_check(req);
804 destroy_reply_info(&req->r_reply_info);
805 if (req->r_request)
806 ceph_msg_put(req->r_request);
807 if (req->r_reply)
808 ceph_msg_put(req->r_reply);
809 if (req->r_inode) {
810 ceph_put_cap_refs(ceph_inode(req->r_inode), CEPH_CAP_PIN);
811 /* avoid calling iput_final() in mds dispatch threads */
812 ceph_async_iput(req->r_inode);
813 }
814 if (req->r_parent) {
815 ceph_put_cap_refs(ceph_inode(req->r_parent), CEPH_CAP_PIN);
816 ceph_async_iput(req->r_parent);
817 }
818 ceph_async_iput(req->r_target_inode);
819 if (req->r_dentry)
820 dput(req->r_dentry);
821 if (req->r_old_dentry)
822 dput(req->r_old_dentry);
823 if (req->r_old_dentry_dir) {
824 /*
825 * track (and drop pins for) r_old_dentry_dir
826 * separately, since r_old_dentry's d_parent may have
827 * changed between the dir mutex being dropped and
828 * this request being freed.
829 */
830 ceph_put_cap_refs(ceph_inode(req->r_old_dentry_dir),
831 CEPH_CAP_PIN);
832 ceph_async_iput(req->r_old_dentry_dir);
833 }
834 kfree(req->r_path1);
835 kfree(req->r_path2);
836 put_cred(req->r_cred);
837 if (req->r_pagelist)
838 ceph_pagelist_release(req->r_pagelist);
839 put_request_session(req);
840 ceph_unreserve_caps(req->r_mdsc, &req->r_caps_reservation);
841 WARN_ON_ONCE(!list_empty(&req->r_wait));
842 kmem_cache_free(ceph_mds_request_cachep, req);
843 }
844
845 DEFINE_RB_FUNCS(request, struct ceph_mds_request, r_tid, r_node)
846
847 /*
848 * lookup session, bump ref if found.
849 *
850 * called under mdsc->mutex.
851 */
852 static struct ceph_mds_request *
853 lookup_get_request(struct ceph_mds_client *mdsc, u64 tid)
854 {
855 struct ceph_mds_request *req;
856
857 req = lookup_request(&mdsc->request_tree, tid);
858 if (req)
859 ceph_mdsc_get_request(req);
860
861 return req;
862 }
863
864 /*
865 * Register an in-flight request, and assign a tid. Link to directory
866 * are modifying (if any).
867 *
868 * Called under mdsc->mutex.
869 */
870 static void __register_request(struct ceph_mds_client *mdsc,
871 struct ceph_mds_request *req,
872 struct inode *dir)
873 {
874 int ret = 0;
875
876 req->r_tid = ++mdsc->last_tid;
877 if (req->r_num_caps) {
878 ret = ceph_reserve_caps(mdsc, &req->r_caps_reservation,
879 req->r_num_caps);
880 if (ret < 0) {
881 pr_err("__register_request %p "
882 "failed to reserve caps: %d\n", req, ret);
883 /* set req->r_err to fail early from __do_request */
884 req->r_err = ret;
885 return;
886 }
887 }
888 dout("__register_request %p tid %lld\n", req, req->r_tid);
889 ceph_mdsc_get_request(req);
890 insert_request(&mdsc->request_tree, req);
891
892 req->r_cred = get_current_cred();
893
894 if (mdsc->oldest_tid == 0 && req->r_op != CEPH_MDS_OP_SETFILELOCK)
895 mdsc->oldest_tid = req->r_tid;
896
897 if (dir) {
898 struct ceph_inode_info *ci = ceph_inode(dir);
899
900 ihold(dir);
901 req->r_unsafe_dir = dir;
902 spin_lock(&ci->i_unsafe_lock);
903 list_add_tail(&req->r_unsafe_dir_item, &ci->i_unsafe_dirops);
904 spin_unlock(&ci->i_unsafe_lock);
905 }
906 }
907
908 static void __unregister_request(struct ceph_mds_client *mdsc,
909 struct ceph_mds_request *req)
910 {
911 dout("__unregister_request %p tid %lld\n", req, req->r_tid);
912
913 /* Never leave an unregistered request on an unsafe list! */
914 list_del_init(&req->r_unsafe_item);
915
916 if (req->r_tid == mdsc->oldest_tid) {
917 struct rb_node *p = rb_next(&req->r_node);
918 mdsc->oldest_tid = 0;
919 while (p) {
920 struct ceph_mds_request *next_req =
921 rb_entry(p, struct ceph_mds_request, r_node);
922 if (next_req->r_op != CEPH_MDS_OP_SETFILELOCK) {
923 mdsc->oldest_tid = next_req->r_tid;
924 break;
925 }
926 p = rb_next(p);
927 }
928 }
929
930 erase_request(&mdsc->request_tree, req);
931
932 if (req->r_unsafe_dir) {
933 struct ceph_inode_info *ci = ceph_inode(req->r_unsafe_dir);
934 spin_lock(&ci->i_unsafe_lock);
935 list_del_init(&req->r_unsafe_dir_item);
936 spin_unlock(&ci->i_unsafe_lock);
937 }
938 if (req->r_target_inode &&
939 test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) {
940 struct ceph_inode_info *ci = ceph_inode(req->r_target_inode);
941 spin_lock(&ci->i_unsafe_lock);
942 list_del_init(&req->r_unsafe_target_item);
943 spin_unlock(&ci->i_unsafe_lock);
944 }
945
946 if (req->r_unsafe_dir) {
947 /* avoid calling iput_final() in mds dispatch threads */
948 ceph_async_iput(req->r_unsafe_dir);
949 req->r_unsafe_dir = NULL;
950 }
951
952 complete_all(&req->r_safe_completion);
953
954 ceph_mdsc_put_request(req);
955 }
956
957 /*
958 * Walk back up the dentry tree until we hit a dentry representing a
959 * non-snapshot inode. We do this using the rcu_read_lock (which must be held
960 * when calling this) to ensure that the objects won't disappear while we're
961 * working with them. Once we hit a candidate dentry, we attempt to take a
962 * reference to it, and return that as the result.
963 */
964 static struct inode *get_nonsnap_parent(struct dentry *dentry)
965 {
966 struct inode *inode = NULL;
967
968 while (dentry && !IS_ROOT(dentry)) {
969 inode = d_inode_rcu(dentry);
970 if (!inode || ceph_snap(inode) == CEPH_NOSNAP)
971 break;
972 dentry = dentry->d_parent;
973 }
974 if (inode)
975 inode = igrab(inode);
976 return inode;
977 }
978
979 /*
980 * Choose mds to send request to next. If there is a hint set in the
981 * request (e.g., due to a prior forward hint from the mds), use that.
982 * Otherwise, consult frag tree and/or caps to identify the
983 * appropriate mds. If all else fails, choose randomly.
984 *
985 * Called under mdsc->mutex.
986 */
987 static int __choose_mds(struct ceph_mds_client *mdsc,
988 struct ceph_mds_request *req,
989 bool *random)
990 {
991 struct inode *inode;
992 struct ceph_inode_info *ci;
993 struct ceph_cap *cap;
994 int mode = req->r_direct_mode;
995 int mds = -1;
996 u32 hash = req->r_direct_hash;
997 bool is_hash = test_bit(CEPH_MDS_R_DIRECT_IS_HASH, &req->r_req_flags);
998
999 if (random)
1000 *random = false;
1001
1002 /*
1003 * is there a specific mds we should try? ignore hint if we have
1004 * no session and the mds is not up (active or recovering).
1005 */
1006 if (req->r_resend_mds >= 0 &&
1007 (__have_session(mdsc, req->r_resend_mds) ||
1008 ceph_mdsmap_get_state(mdsc->mdsmap, req->r_resend_mds) > 0)) {
1009 dout("%s using resend_mds mds%d\n", __func__,
1010 req->r_resend_mds);
1011 return req->r_resend_mds;
1012 }
1013
1014 if (mode == USE_RANDOM_MDS)
1015 goto random;
1016
1017 inode = NULL;
1018 if (req->r_inode) {
1019 if (ceph_snap(req->r_inode) != CEPH_SNAPDIR) {
1020 inode = req->r_inode;
1021 ihold(inode);
1022 } else {
1023 /* req->r_dentry is non-null for LSSNAP request */
1024 rcu_read_lock();
1025 inode = get_nonsnap_parent(req->r_dentry);
1026 rcu_read_unlock();
1027 dout("%s using snapdir's parent %p\n", __func__, inode);
1028 }
1029 } else if (req->r_dentry) {
1030 /* ignore race with rename; old or new d_parent is okay */
1031 struct dentry *parent;
1032 struct inode *dir;
1033
1034 rcu_read_lock();
1035 parent = READ_ONCE(req->r_dentry->d_parent);
1036 dir = req->r_parent ? : d_inode_rcu(parent);
1037
1038 if (!dir || dir->i_sb != mdsc->fsc->sb) {
1039 /* not this fs or parent went negative */
1040 inode = d_inode(req->r_dentry);
1041 if (inode)
1042 ihold(inode);
1043 } else if (ceph_snap(dir) != CEPH_NOSNAP) {
1044 /* direct snapped/virtual snapdir requests
1045 * based on parent dir inode */
1046 inode = get_nonsnap_parent(parent);
1047 dout("%s using nonsnap parent %p\n", __func__, inode);
1048 } else {
1049 /* dentry target */
1050 inode = d_inode(req->r_dentry);
1051 if (!inode || mode == USE_AUTH_MDS) {
1052 /* dir + name */
1053 inode = igrab(dir);
1054 hash = ceph_dentry_hash(dir, req->r_dentry);
1055 is_hash = true;
1056 } else {
1057 ihold(inode);
1058 }
1059 }
1060 rcu_read_unlock();
1061 }
1062
1063 dout("%s %p is_hash=%d (0x%x) mode %d\n", __func__, inode, (int)is_hash,
1064 hash, mode);
1065 if (!inode)
1066 goto random;
1067 ci = ceph_inode(inode);
1068
1069 if (is_hash && S_ISDIR(inode->i_mode)) {
1070 struct ceph_inode_frag frag;
1071 int found;
1072
1073 ceph_choose_frag(ci, hash, &frag, &found);
1074 if (found) {
1075 if (mode == USE_ANY_MDS && frag.ndist > 0) {
1076 u8 r;
1077
1078 /* choose a random replica */
1079 get_random_bytes(&r, 1);
1080 r %= frag.ndist;
1081 mds = frag.dist[r];
1082 dout("%s %p %llx.%llx frag %u mds%d (%d/%d)\n",
1083 __func__, inode, ceph_vinop(inode),
1084 frag.frag, mds, (int)r, frag.ndist);
1085 if (ceph_mdsmap_get_state(mdsc->mdsmap, mds) >=
1086 CEPH_MDS_STATE_ACTIVE &&
1087 !ceph_mdsmap_is_laggy(mdsc->mdsmap, mds))
1088 goto out;
1089 }
1090
1091 /* since this file/dir wasn't known to be
1092 * replicated, then we want to look for the
1093 * authoritative mds. */
1094 if (frag.mds >= 0) {
1095 /* choose auth mds */
1096 mds = frag.mds;
1097 dout("%s %p %llx.%llx frag %u mds%d (auth)\n",
1098 __func__, inode, ceph_vinop(inode),
1099 frag.frag, mds);
1100 if (ceph_mdsmap_get_state(mdsc->mdsmap, mds) >=
1101 CEPH_MDS_STATE_ACTIVE) {
1102 if (!ceph_mdsmap_is_laggy(mdsc->mdsmap,
1103 mds))
1104 goto out;
1105 }
1106 }
1107 mode = USE_AUTH_MDS;
1108 }
1109 }
1110
1111 spin_lock(&ci->i_ceph_lock);
1112 cap = NULL;
1113 if (mode == USE_AUTH_MDS)
1114 cap = ci->i_auth_cap;
1115 if (!cap && !RB_EMPTY_ROOT(&ci->i_caps))
1116 cap = rb_entry(rb_first(&ci->i_caps), struct ceph_cap, ci_node);
1117 if (!cap) {
1118 spin_unlock(&ci->i_ceph_lock);
1119 ceph_async_iput(inode);
1120 goto random;
1121 }
1122 mds = cap->session->s_mds;
1123 dout("%s %p %llx.%llx mds%d (%scap %p)\n", __func__,
1124 inode, ceph_vinop(inode), mds,
1125 cap == ci->i_auth_cap ? "auth " : "", cap);
1126 spin_unlock(&ci->i_ceph_lock);
1127 out:
1128 /* avoid calling iput_final() while holding mdsc->mutex or
1129 * in mds dispatch threads */
1130 ceph_async_iput(inode);
1131 return mds;
1132
1133 random:
1134 if (random)
1135 *random = true;
1136
1137 mds = ceph_mdsmap_get_random_mds(mdsc->mdsmap);
1138 dout("%s chose random mds%d\n", __func__, mds);
1139 return mds;
1140 }
1141
1142
1143 /*
1144 * session messages
1145 */
1146 static struct ceph_msg *create_session_msg(u32 op, u64 seq)
1147 {
1148 struct ceph_msg *msg;
1149 struct ceph_mds_session_head *h;
1150
1151 msg = ceph_msg_new(CEPH_MSG_CLIENT_SESSION, sizeof(*h), GFP_NOFS,
1152 false);
1153 if (!msg) {
1154 pr_err("create_session_msg ENOMEM creating msg\n");
1155 return NULL;
1156 }
1157 h = msg->front.iov_base;
1158 h->op = cpu_to_le32(op);
1159 h->seq = cpu_to_le64(seq);
1160
1161 return msg;
1162 }
1163
1164 static const unsigned char feature_bits[] = CEPHFS_FEATURES_CLIENT_SUPPORTED;
1165 #define FEATURE_BYTES(c) (DIV_ROUND_UP((size_t)feature_bits[c - 1] + 1, 64) * 8)
1166 static int encode_supported_features(void **p, void *end)
1167 {
1168 static const size_t count = ARRAY_SIZE(feature_bits);
1169
1170 if (count > 0) {
1171 size_t i;
1172 size_t size = FEATURE_BYTES(count);
1173
1174 if (WARN_ON_ONCE(*p + 4 + size > end))
1175 return -ERANGE;
1176
1177 ceph_encode_32(p, size);
1178 memset(*p, 0, size);
1179 for (i = 0; i < count; i++)
1180 ((unsigned char*)(*p))[i / 8] |= BIT(feature_bits[i] % 8);
1181 *p += size;
1182 } else {
1183 if (WARN_ON_ONCE(*p + 4 > end))
1184 return -ERANGE;
1185
1186 ceph_encode_32(p, 0);
1187 }
1188
1189 return 0;
1190 }
1191
1192 static const unsigned char metric_bits[] = CEPHFS_METRIC_SPEC_CLIENT_SUPPORTED;
1193 #define METRIC_BYTES(cnt) (DIV_ROUND_UP((size_t)metric_bits[cnt - 1] + 1, 64) * 8)
1194 static int encode_metric_spec(void **p, void *end)
1195 {
1196 static const size_t count = ARRAY_SIZE(metric_bits);
1197
1198 /* header */
1199 if (WARN_ON_ONCE(*p + 2 > end))
1200 return -ERANGE;
1201
1202 ceph_encode_8(p, 1); /* version */
1203 ceph_encode_8(p, 1); /* compat */
1204
1205 if (count > 0) {
1206 size_t i;
1207 size_t size = METRIC_BYTES(count);
1208
1209 if (WARN_ON_ONCE(*p + 4 + 4 + size > end))
1210 return -ERANGE;
1211
1212 /* metric spec info length */
1213 ceph_encode_32(p, 4 + size);
1214
1215 /* metric spec */
1216 ceph_encode_32(p, size);
1217 memset(*p, 0, size);
1218 for (i = 0; i < count; i++)
1219 ((unsigned char *)(*p))[i / 8] |= BIT(metric_bits[i] % 8);
1220 *p += size;
1221 } else {
1222 if (WARN_ON_ONCE(*p + 4 + 4 > end))
1223 return -ERANGE;
1224
1225 /* metric spec info length */
1226 ceph_encode_32(p, 4);
1227 /* metric spec */
1228 ceph_encode_32(p, 0);
1229 }
1230
1231 return 0;
1232 }
1233
1234 /*
1235 * session message, specialization for CEPH_SESSION_REQUEST_OPEN
1236 * to include additional client metadata fields.
1237 */
1238 static struct ceph_msg *create_session_open_msg(struct ceph_mds_client *mdsc, u64 seq)
1239 {
1240 struct ceph_msg *msg;
1241 struct ceph_mds_session_head *h;
1242 int i;
1243 int extra_bytes = 0;
1244 int metadata_key_count = 0;
1245 struct ceph_options *opt = mdsc->fsc->client->options;
1246 struct ceph_mount_options *fsopt = mdsc->fsc->mount_options;
1247 size_t size, count;
1248 void *p, *end;
1249 int ret;
1250
1251 const char* metadata[][2] = {
1252 {"hostname", mdsc->nodename},
1253 {"kernel_version", init_utsname()->release},
1254 {"entity_id", opt->name ? : ""},
1255 {"root", fsopt->server_path ? : "/"},
1256 {NULL, NULL}
1257 };
1258
1259 /* Calculate serialized length of metadata */
1260 extra_bytes = 4; /* map length */
1261 for (i = 0; metadata[i][0]; ++i) {
1262 extra_bytes += 8 + strlen(metadata[i][0]) +
1263 strlen(metadata[i][1]);
1264 metadata_key_count++;
1265 }
1266
1267 /* supported feature */
1268 size = 0;
1269 count = ARRAY_SIZE(feature_bits);
1270 if (count > 0)
1271 size = FEATURE_BYTES(count);
1272 extra_bytes += 4 + size;
1273
1274 /* metric spec */
1275 size = 0;
1276 count = ARRAY_SIZE(metric_bits);
1277 if (count > 0)
1278 size = METRIC_BYTES(count);
1279 extra_bytes += 2 + 4 + 4 + size;
1280
1281 /* Allocate the message */
1282 msg = ceph_msg_new(CEPH_MSG_CLIENT_SESSION, sizeof(*h) + extra_bytes,
1283 GFP_NOFS, false);
1284 if (!msg) {
1285 pr_err("create_session_msg ENOMEM creating msg\n");
1286 return ERR_PTR(-ENOMEM);
1287 }
1288 p = msg->front.iov_base;
1289 end = p + msg->front.iov_len;
1290
1291 h = p;
1292 h->op = cpu_to_le32(CEPH_SESSION_REQUEST_OPEN);
1293 h->seq = cpu_to_le64(seq);
1294
1295 /*
1296 * Serialize client metadata into waiting buffer space, using
1297 * the format that userspace expects for map<string, string>
1298 *
1299 * ClientSession messages with metadata are v4
1300 */
1301 msg->hdr.version = cpu_to_le16(4);
1302 msg->hdr.compat_version = cpu_to_le16(1);
1303
1304 /* The write pointer, following the session_head structure */
1305 p += sizeof(*h);
1306
1307 /* Number of entries in the map */
1308 ceph_encode_32(&p, metadata_key_count);
1309
1310 /* Two length-prefixed strings for each entry in the map */
1311 for (i = 0; metadata[i][0]; ++i) {
1312 size_t const key_len = strlen(metadata[i][0]);
1313 size_t const val_len = strlen(metadata[i][1]);
1314
1315 ceph_encode_32(&p, key_len);
1316 memcpy(p, metadata[i][0], key_len);
1317 p += key_len;
1318 ceph_encode_32(&p, val_len);
1319 memcpy(p, metadata[i][1], val_len);
1320 p += val_len;
1321 }
1322
1323 ret = encode_supported_features(&p, end);
1324 if (ret) {
1325 pr_err("encode_supported_features failed!\n");
1326 ceph_msg_put(msg);
1327 return ERR_PTR(ret);
1328 }
1329
1330 ret = encode_metric_spec(&p, end);
1331 if (ret) {
1332 pr_err("encode_metric_spec failed!\n");
1333 ceph_msg_put(msg);
1334 return ERR_PTR(ret);
1335 }
1336
1337 msg->front.iov_len = p - msg->front.iov_base;
1338 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
1339
1340 return msg;
1341 }
1342
1343 /*
1344 * send session open request.
1345 *
1346 * called under mdsc->mutex
1347 */
1348 static int __open_session(struct ceph_mds_client *mdsc,
1349 struct ceph_mds_session *session)
1350 {
1351 struct ceph_msg *msg;
1352 int mstate;
1353 int mds = session->s_mds;
1354
1355 /* wait for mds to go active? */
1356 mstate = ceph_mdsmap_get_state(mdsc->mdsmap, mds);
1357 dout("open_session to mds%d (%s)\n", mds,
1358 ceph_mds_state_name(mstate));
1359 session->s_state = CEPH_MDS_SESSION_OPENING;
1360 session->s_renew_requested = jiffies;
1361
1362 /* send connect message */
1363 msg = create_session_open_msg(mdsc, session->s_seq);
1364 if (IS_ERR(msg))
1365 return PTR_ERR(msg);
1366 ceph_con_send(&session->s_con, msg);
1367 return 0;
1368 }
1369
1370 /*
1371 * open sessions for any export targets for the given mds
1372 *
1373 * called under mdsc->mutex
1374 */
1375 static struct ceph_mds_session *
1376 __open_export_target_session(struct ceph_mds_client *mdsc, int target)
1377 {
1378 struct ceph_mds_session *session;
1379 int ret;
1380
1381 session = __ceph_lookup_mds_session(mdsc, target);
1382 if (!session) {
1383 session = register_session(mdsc, target);
1384 if (IS_ERR(session))
1385 return session;
1386 }
1387 if (session->s_state == CEPH_MDS_SESSION_NEW ||
1388 session->s_state == CEPH_MDS_SESSION_CLOSING) {
1389 ret = __open_session(mdsc, session);
1390 if (ret)
1391 return ERR_PTR(ret);
1392 }
1393
1394 return session;
1395 }
1396
1397 struct ceph_mds_session *
1398 ceph_mdsc_open_export_target_session(struct ceph_mds_client *mdsc, int target)
1399 {
1400 struct ceph_mds_session *session;
1401
1402 dout("open_export_target_session to mds%d\n", target);
1403
1404 mutex_lock(&mdsc->mutex);
1405 session = __open_export_target_session(mdsc, target);
1406 mutex_unlock(&mdsc->mutex);
1407
1408 return session;
1409 }
1410
1411 static void __open_export_target_sessions(struct ceph_mds_client *mdsc,
1412 struct ceph_mds_session *session)
1413 {
1414 struct ceph_mds_info *mi;
1415 struct ceph_mds_session *ts;
1416 int i, mds = session->s_mds;
1417
1418 if (mds >= mdsc->mdsmap->possible_max_rank)
1419 return;
1420
1421 mi = &mdsc->mdsmap->m_info[mds];
1422 dout("open_export_target_sessions for mds%d (%d targets)\n",
1423 session->s_mds, mi->num_export_targets);
1424
1425 for (i = 0; i < mi->num_export_targets; i++) {
1426 ts = __open_export_target_session(mdsc, mi->export_targets[i]);
1427 if (!IS_ERR(ts))
1428 ceph_put_mds_session(ts);
1429 }
1430 }
1431
1432 void ceph_mdsc_open_export_target_sessions(struct ceph_mds_client *mdsc,
1433 struct ceph_mds_session *session)
1434 {
1435 mutex_lock(&mdsc->mutex);
1436 __open_export_target_sessions(mdsc, session);
1437 mutex_unlock(&mdsc->mutex);
1438 }
1439
1440 /*
1441 * session caps
1442 */
1443
1444 static void detach_cap_releases(struct ceph_mds_session *session,
1445 struct list_head *target)
1446 {
1447 lockdep_assert_held(&session->s_cap_lock);
1448
1449 list_splice_init(&session->s_cap_releases, target);
1450 session->s_num_cap_releases = 0;
1451 dout("dispose_cap_releases mds%d\n", session->s_mds);
1452 }
1453
1454 static void dispose_cap_releases(struct ceph_mds_client *mdsc,
1455 struct list_head *dispose)
1456 {
1457 while (!list_empty(dispose)) {
1458 struct ceph_cap *cap;
1459 /* zero out the in-progress message */
1460 cap = list_first_entry(dispose, struct ceph_cap, session_caps);
1461 list_del(&cap->session_caps);
1462 ceph_put_cap(mdsc, cap);
1463 }
1464 }
1465
1466 static void cleanup_session_requests(struct ceph_mds_client *mdsc,
1467 struct ceph_mds_session *session)
1468 {
1469 struct ceph_mds_request *req;
1470 struct rb_node *p;
1471 struct ceph_inode_info *ci;
1472
1473 dout("cleanup_session_requests mds%d\n", session->s_mds);
1474 mutex_lock(&mdsc->mutex);
1475 while (!list_empty(&session->s_unsafe)) {
1476 req = list_first_entry(&session->s_unsafe,
1477 struct ceph_mds_request, r_unsafe_item);
1478 pr_warn_ratelimited(" dropping unsafe request %llu\n",
1479 req->r_tid);
1480 if (req->r_target_inode) {
1481 /* dropping unsafe change of inode's attributes */
1482 ci = ceph_inode(req->r_target_inode);
1483 errseq_set(&ci->i_meta_err, -EIO);
1484 }
1485 if (req->r_unsafe_dir) {
1486 /* dropping unsafe directory operation */
1487 ci = ceph_inode(req->r_unsafe_dir);
1488 errseq_set(&ci->i_meta_err, -EIO);
1489 }
1490 __unregister_request(mdsc, req);
1491 }
1492 /* zero r_attempts, so kick_requests() will re-send requests */
1493 p = rb_first(&mdsc->request_tree);
1494 while (p) {
1495 req = rb_entry(p, struct ceph_mds_request, r_node);
1496 p = rb_next(p);
1497 if (req->r_session &&
1498 req->r_session->s_mds == session->s_mds)
1499 req->r_attempts = 0;
1500 }
1501 mutex_unlock(&mdsc->mutex);
1502 }
1503
1504 /*
1505 * Helper to safely iterate over all caps associated with a session, with
1506 * special care taken to handle a racing __ceph_remove_cap().
1507 *
1508 * Caller must hold session s_mutex.
1509 */
1510 int ceph_iterate_session_caps(struct ceph_mds_session *session,
1511 int (*cb)(struct inode *, struct ceph_cap *,
1512 void *), void *arg)
1513 {
1514 struct list_head *p;
1515 struct ceph_cap *cap;
1516 struct inode *inode, *last_inode = NULL;
1517 struct ceph_cap *old_cap = NULL;
1518 int ret;
1519
1520 dout("iterate_session_caps %p mds%d\n", session, session->s_mds);
1521 spin_lock(&session->s_cap_lock);
1522 p = session->s_caps.next;
1523 while (p != &session->s_caps) {
1524 cap = list_entry(p, struct ceph_cap, session_caps);
1525 inode = igrab(&cap->ci->vfs_inode);
1526 if (!inode) {
1527 p = p->next;
1528 continue;
1529 }
1530 session->s_cap_iterator = cap;
1531 spin_unlock(&session->s_cap_lock);
1532
1533 if (last_inode) {
1534 /* avoid calling iput_final() while holding
1535 * s_mutex or in mds dispatch threads */
1536 ceph_async_iput(last_inode);
1537 last_inode = NULL;
1538 }
1539 if (old_cap) {
1540 ceph_put_cap(session->s_mdsc, old_cap);
1541 old_cap = NULL;
1542 }
1543
1544 ret = cb(inode, cap, arg);
1545 last_inode = inode;
1546
1547 spin_lock(&session->s_cap_lock);
1548 p = p->next;
1549 if (!cap->ci) {
1550 dout("iterate_session_caps finishing cap %p removal\n",
1551 cap);
1552 BUG_ON(cap->session != session);
1553 cap->session = NULL;
1554 list_del_init(&cap->session_caps);
1555 session->s_nr_caps--;
1556 atomic64_dec(&session->s_mdsc->metric.total_caps);
1557 if (cap->queue_release)
1558 __ceph_queue_cap_release(session, cap);
1559 else
1560 old_cap = cap; /* put_cap it w/o locks held */
1561 }
1562 if (ret < 0)
1563 goto out;
1564 }
1565 ret = 0;
1566 out:
1567 session->s_cap_iterator = NULL;
1568 spin_unlock(&session->s_cap_lock);
1569
1570 ceph_async_iput(last_inode);
1571 if (old_cap)
1572 ceph_put_cap(session->s_mdsc, old_cap);
1573
1574 return ret;
1575 }
1576
1577 static int remove_session_caps_cb(struct inode *inode, struct ceph_cap *cap,
1578 void *arg)
1579 {
1580 struct ceph_fs_client *fsc = (struct ceph_fs_client *)arg;
1581 struct ceph_inode_info *ci = ceph_inode(inode);
1582 LIST_HEAD(to_remove);
1583 bool dirty_dropped = false;
1584 bool invalidate = false;
1585
1586 dout("removing cap %p, ci is %p, inode is %p\n",
1587 cap, ci, &ci->vfs_inode);
1588 spin_lock(&ci->i_ceph_lock);
1589 __ceph_remove_cap(cap, false);
1590 if (!ci->i_auth_cap) {
1591 struct ceph_cap_flush *cf;
1592 struct ceph_mds_client *mdsc = fsc->mdsc;
1593
1594 if (READ_ONCE(fsc->mount_state) >= CEPH_MOUNT_SHUTDOWN) {
1595 if (inode->i_data.nrpages > 0)
1596 invalidate = true;
1597 if (ci->i_wrbuffer_ref > 0)
1598 mapping_set_error(&inode->i_data, -EIO);
1599 }
1600
1601 while (!list_empty(&ci->i_cap_flush_list)) {
1602 cf = list_first_entry(&ci->i_cap_flush_list,
1603 struct ceph_cap_flush, i_list);
1604 list_move(&cf->i_list, &to_remove);
1605 }
1606
1607 spin_lock(&mdsc->cap_dirty_lock);
1608
1609 list_for_each_entry(cf, &to_remove, i_list)
1610 list_del(&cf->g_list);
1611
1612 if (!list_empty(&ci->i_dirty_item)) {
1613 pr_warn_ratelimited(
1614 " dropping dirty %s state for %p %lld\n",
1615 ceph_cap_string(ci->i_dirty_caps),
1616 inode, ceph_ino(inode));
1617 ci->i_dirty_caps = 0;
1618 list_del_init(&ci->i_dirty_item);
1619 dirty_dropped = true;
1620 }
1621 if (!list_empty(&ci->i_flushing_item)) {
1622 pr_warn_ratelimited(
1623 " dropping dirty+flushing %s state for %p %lld\n",
1624 ceph_cap_string(ci->i_flushing_caps),
1625 inode, ceph_ino(inode));
1626 ci->i_flushing_caps = 0;
1627 list_del_init(&ci->i_flushing_item);
1628 mdsc->num_cap_flushing--;
1629 dirty_dropped = true;
1630 }
1631 spin_unlock(&mdsc->cap_dirty_lock);
1632
1633 if (dirty_dropped) {
1634 errseq_set(&ci->i_meta_err, -EIO);
1635
1636 if (ci->i_wrbuffer_ref_head == 0 &&
1637 ci->i_wr_ref == 0 &&
1638 ci->i_dirty_caps == 0 &&
1639 ci->i_flushing_caps == 0) {
1640 ceph_put_snap_context(ci->i_head_snapc);
1641 ci->i_head_snapc = NULL;
1642 }
1643 }
1644
1645 if (atomic_read(&ci->i_filelock_ref) > 0) {
1646 /* make further file lock syscall return -EIO */
1647 ci->i_ceph_flags |= CEPH_I_ERROR_FILELOCK;
1648 pr_warn_ratelimited(" dropping file locks for %p %lld\n",
1649 inode, ceph_ino(inode));
1650 }
1651
1652 if (!ci->i_dirty_caps && ci->i_prealloc_cap_flush) {
1653 list_add(&ci->i_prealloc_cap_flush->i_list, &to_remove);
1654 ci->i_prealloc_cap_flush = NULL;
1655 }
1656 }
1657 spin_unlock(&ci->i_ceph_lock);
1658 while (!list_empty(&to_remove)) {
1659 struct ceph_cap_flush *cf;
1660 cf = list_first_entry(&to_remove,
1661 struct ceph_cap_flush, i_list);
1662 list_del(&cf->i_list);
1663 ceph_free_cap_flush(cf);
1664 }
1665
1666 wake_up_all(&ci->i_cap_wq);
1667 if (invalidate)
1668 ceph_queue_invalidate(inode);
1669 if (dirty_dropped)
1670 iput(inode);
1671 return 0;
1672 }
1673
1674 /*
1675 * caller must hold session s_mutex
1676 */
1677 static void remove_session_caps(struct ceph_mds_session *session)
1678 {
1679 struct ceph_fs_client *fsc = session->s_mdsc->fsc;
1680 struct super_block *sb = fsc->sb;
1681 LIST_HEAD(dispose);
1682
1683 dout("remove_session_caps on %p\n", session);
1684 ceph_iterate_session_caps(session, remove_session_caps_cb, fsc);
1685
1686 wake_up_all(&fsc->mdsc->cap_flushing_wq);
1687
1688 spin_lock(&session->s_cap_lock);
1689 if (session->s_nr_caps > 0) {
1690 struct inode *inode;
1691 struct ceph_cap *cap, *prev = NULL;
1692 struct ceph_vino vino;
1693 /*
1694 * iterate_session_caps() skips inodes that are being
1695 * deleted, we need to wait until deletions are complete.
1696 * __wait_on_freeing_inode() is designed for the job,
1697 * but it is not exported, so use lookup inode function
1698 * to access it.
1699 */
1700 while (!list_empty(&session->s_caps)) {
1701 cap = list_entry(session->s_caps.next,
1702 struct ceph_cap, session_caps);
1703 if (cap == prev)
1704 break;
1705 prev = cap;
1706 vino = cap->ci->i_vino;
1707 spin_unlock(&session->s_cap_lock);
1708
1709 inode = ceph_find_inode(sb, vino);
1710 /* avoid calling iput_final() while holding s_mutex */
1711 ceph_async_iput(inode);
1712
1713 spin_lock(&session->s_cap_lock);
1714 }
1715 }
1716
1717 // drop cap expires and unlock s_cap_lock
1718 detach_cap_releases(session, &dispose);
1719
1720 BUG_ON(session->s_nr_caps > 0);
1721 BUG_ON(!list_empty(&session->s_cap_flushing));
1722 spin_unlock(&session->s_cap_lock);
1723 dispose_cap_releases(session->s_mdsc, &dispose);
1724 }
1725
1726 enum {
1727 RECONNECT,
1728 RENEWCAPS,
1729 FORCE_RO,
1730 };
1731
1732 /*
1733 * wake up any threads waiting on this session's caps. if the cap is
1734 * old (didn't get renewed on the client reconnect), remove it now.
1735 *
1736 * caller must hold s_mutex.
1737 */
1738 static int wake_up_session_cb(struct inode *inode, struct ceph_cap *cap,
1739 void *arg)
1740 {
1741 struct ceph_inode_info *ci = ceph_inode(inode);
1742 unsigned long ev = (unsigned long)arg;
1743
1744 if (ev == RECONNECT) {
1745 spin_lock(&ci->i_ceph_lock);
1746 ci->i_wanted_max_size = 0;
1747 ci->i_requested_max_size = 0;
1748 spin_unlock(&ci->i_ceph_lock);
1749 } else if (ev == RENEWCAPS) {
1750 if (cap->cap_gen < cap->session->s_cap_gen) {
1751 /* mds did not re-issue stale cap */
1752 spin_lock(&ci->i_ceph_lock);
1753 cap->issued = cap->implemented = CEPH_CAP_PIN;
1754 spin_unlock(&ci->i_ceph_lock);
1755 }
1756 } else if (ev == FORCE_RO) {
1757 }
1758 wake_up_all(&ci->i_cap_wq);
1759 return 0;
1760 }
1761
1762 static void wake_up_session_caps(struct ceph_mds_session *session, int ev)
1763 {
1764 dout("wake_up_session_caps %p mds%d\n", session, session->s_mds);
1765 ceph_iterate_session_caps(session, wake_up_session_cb,
1766 (void *)(unsigned long)ev);
1767 }
1768
1769 /*
1770 * Send periodic message to MDS renewing all currently held caps. The
1771 * ack will reset the expiration for all caps from this session.
1772 *
1773 * caller holds s_mutex
1774 */
1775 static int send_renew_caps(struct ceph_mds_client *mdsc,
1776 struct ceph_mds_session *session)
1777 {
1778 struct ceph_msg *msg;
1779 int state;
1780
1781 if (time_after_eq(jiffies, session->s_cap_ttl) &&
1782 time_after_eq(session->s_cap_ttl, session->s_renew_requested))
1783 pr_info("mds%d caps stale\n", session->s_mds);
1784 session->s_renew_requested = jiffies;
1785
1786 /* do not try to renew caps until a recovering mds has reconnected
1787 * with its clients. */
1788 state = ceph_mdsmap_get_state(mdsc->mdsmap, session->s_mds);
1789 if (state < CEPH_MDS_STATE_RECONNECT) {
1790 dout("send_renew_caps ignoring mds%d (%s)\n",
1791 session->s_mds, ceph_mds_state_name(state));
1792 return 0;
1793 }
1794
1795 dout("send_renew_caps to mds%d (%s)\n", session->s_mds,
1796 ceph_mds_state_name(state));
1797 msg = create_session_msg(CEPH_SESSION_REQUEST_RENEWCAPS,
1798 ++session->s_renew_seq);
1799 if (!msg)
1800 return -ENOMEM;
1801 ceph_con_send(&session->s_con, msg);
1802 return 0;
1803 }
1804
1805 static int send_flushmsg_ack(struct ceph_mds_client *mdsc,
1806 struct ceph_mds_session *session, u64 seq)
1807 {
1808 struct ceph_msg *msg;
1809
1810 dout("send_flushmsg_ack to mds%d (%s)s seq %lld\n",
1811 session->s_mds, ceph_session_state_name(session->s_state), seq);
1812 msg = create_session_msg(CEPH_SESSION_FLUSHMSG_ACK, seq);
1813 if (!msg)
1814 return -ENOMEM;
1815 ceph_con_send(&session->s_con, msg);
1816 return 0;
1817 }
1818
1819
1820 /*
1821 * Note new cap ttl, and any transition from stale -> not stale (fresh?).
1822 *
1823 * Called under session->s_mutex
1824 */
1825 static void renewed_caps(struct ceph_mds_client *mdsc,
1826 struct ceph_mds_session *session, int is_renew)
1827 {
1828 int was_stale;
1829 int wake = 0;
1830
1831 spin_lock(&session->s_cap_lock);
1832 was_stale = is_renew && time_after_eq(jiffies, session->s_cap_ttl);
1833
1834 session->s_cap_ttl = session->s_renew_requested +
1835 mdsc->mdsmap->m_session_timeout*HZ;
1836
1837 if (was_stale) {
1838 if (time_before(jiffies, session->s_cap_ttl)) {
1839 pr_info("mds%d caps renewed\n", session->s_mds);
1840 wake = 1;
1841 } else {
1842 pr_info("mds%d caps still stale\n", session->s_mds);
1843 }
1844 }
1845 dout("renewed_caps mds%d ttl now %lu, was %s, now %s\n",
1846 session->s_mds, session->s_cap_ttl, was_stale ? "stale" : "fresh",
1847 time_before(jiffies, session->s_cap_ttl) ? "stale" : "fresh");
1848 spin_unlock(&session->s_cap_lock);
1849
1850 if (wake)
1851 wake_up_session_caps(session, RENEWCAPS);
1852 }
1853
1854 /*
1855 * send a session close request
1856 */
1857 static int request_close_session(struct ceph_mds_session *session)
1858 {
1859 struct ceph_msg *msg;
1860
1861 dout("request_close_session mds%d state %s seq %lld\n",
1862 session->s_mds, ceph_session_state_name(session->s_state),
1863 session->s_seq);
1864 msg = create_session_msg(CEPH_SESSION_REQUEST_CLOSE, session->s_seq);
1865 if (!msg)
1866 return -ENOMEM;
1867 ceph_con_send(&session->s_con, msg);
1868 return 1;
1869 }
1870
1871 /*
1872 * Called with s_mutex held.
1873 */
1874 static int __close_session(struct ceph_mds_client *mdsc,
1875 struct ceph_mds_session *session)
1876 {
1877 if (session->s_state >= CEPH_MDS_SESSION_CLOSING)
1878 return 0;
1879 session->s_state = CEPH_MDS_SESSION_CLOSING;
1880 return request_close_session(session);
1881 }
1882
1883 static bool drop_negative_children(struct dentry *dentry)
1884 {
1885 struct dentry *child;
1886 bool all_negative = true;
1887
1888 if (!d_is_dir(dentry))
1889 goto out;
1890
1891 spin_lock(&dentry->d_lock);
1892 list_for_each_entry(child, &dentry->d_subdirs, d_child) {
1893 if (d_really_is_positive(child)) {
1894 all_negative = false;
1895 break;
1896 }
1897 }
1898 spin_unlock(&dentry->d_lock);
1899
1900 if (all_negative)
1901 shrink_dcache_parent(dentry);
1902 out:
1903 return all_negative;
1904 }
1905
1906 /*
1907 * Trim old(er) caps.
1908 *
1909 * Because we can't cache an inode without one or more caps, we do
1910 * this indirectly: if a cap is unused, we prune its aliases, at which
1911 * point the inode will hopefully get dropped to.
1912 *
1913 * Yes, this is a bit sloppy. Our only real goal here is to respond to
1914 * memory pressure from the MDS, though, so it needn't be perfect.
1915 */
1916 static int trim_caps_cb(struct inode *inode, struct ceph_cap *cap, void *arg)
1917 {
1918 int *remaining = arg;
1919 struct ceph_inode_info *ci = ceph_inode(inode);
1920 int used, wanted, oissued, mine;
1921
1922 if (*remaining <= 0)
1923 return -1;
1924
1925 spin_lock(&ci->i_ceph_lock);
1926 mine = cap->issued | cap->implemented;
1927 used = __ceph_caps_used(ci);
1928 wanted = __ceph_caps_file_wanted(ci);
1929 oissued = __ceph_caps_issued_other(ci, cap);
1930
1931 dout("trim_caps_cb %p cap %p mine %s oissued %s used %s wanted %s\n",
1932 inode, cap, ceph_cap_string(mine), ceph_cap_string(oissued),
1933 ceph_cap_string(used), ceph_cap_string(wanted));
1934 if (cap == ci->i_auth_cap) {
1935 if (ci->i_dirty_caps || ci->i_flushing_caps ||
1936 !list_empty(&ci->i_cap_snaps))
1937 goto out;
1938 if ((used | wanted) & CEPH_CAP_ANY_WR)
1939 goto out;
1940 /* Note: it's possible that i_filelock_ref becomes non-zero
1941 * after dropping auth caps. It doesn't hurt because reply
1942 * of lock mds request will re-add auth caps. */
1943 if (atomic_read(&ci->i_filelock_ref) > 0)
1944 goto out;
1945 }
1946 /* The inode has cached pages, but it's no longer used.
1947 * we can safely drop it */
1948 if (S_ISREG(inode->i_mode) &&
1949 wanted == 0 && used == CEPH_CAP_FILE_CACHE &&
1950 !(oissued & CEPH_CAP_FILE_CACHE)) {
1951 used = 0;
1952 oissued = 0;
1953 }
1954 if ((used | wanted) & ~oissued & mine)
1955 goto out; /* we need these caps */
1956
1957 if (oissued) {
1958 /* we aren't the only cap.. just remove us */
1959 __ceph_remove_cap(cap, true);
1960 (*remaining)--;
1961 } else {
1962 struct dentry *dentry;
1963 /* try dropping referring dentries */
1964 spin_unlock(&ci->i_ceph_lock);
1965 dentry = d_find_any_alias(inode);
1966 if (dentry && drop_negative_children(dentry)) {
1967 int count;
1968 dput(dentry);
1969 d_prune_aliases(inode);
1970 count = atomic_read(&inode->i_count);
1971 if (count == 1)
1972 (*remaining)--;
1973 dout("trim_caps_cb %p cap %p pruned, count now %d\n",
1974 inode, cap, count);
1975 } else {
1976 dput(dentry);
1977 }
1978 return 0;
1979 }
1980
1981 out:
1982 spin_unlock(&ci->i_ceph_lock);
1983 return 0;
1984 }
1985
1986 /*
1987 * Trim session cap count down to some max number.
1988 */
1989 int ceph_trim_caps(struct ceph_mds_client *mdsc,
1990 struct ceph_mds_session *session,
1991 int max_caps)
1992 {
1993 int trim_caps = session->s_nr_caps - max_caps;
1994
1995 dout("trim_caps mds%d start: %d / %d, trim %d\n",
1996 session->s_mds, session->s_nr_caps, max_caps, trim_caps);
1997 if (trim_caps > 0) {
1998 int remaining = trim_caps;
1999
2000 ceph_iterate_session_caps(session, trim_caps_cb, &remaining);
2001 dout("trim_caps mds%d done: %d / %d, trimmed %d\n",
2002 session->s_mds, session->s_nr_caps, max_caps,
2003 trim_caps - remaining);
2004 }
2005
2006 ceph_flush_cap_releases(mdsc, session);
2007 return 0;
2008 }
2009
2010 static int check_caps_flush(struct ceph_mds_client *mdsc,
2011 u64 want_flush_tid)
2012 {
2013 int ret = 1;
2014
2015 spin_lock(&mdsc->cap_dirty_lock);
2016 if (!list_empty(&mdsc->cap_flush_list)) {
2017 struct ceph_cap_flush *cf =
2018 list_first_entry(&mdsc->cap_flush_list,
2019 struct ceph_cap_flush, g_list);
2020 if (cf->tid <= want_flush_tid) {
2021 dout("check_caps_flush still flushing tid "
2022 "%llu <= %llu\n", cf->tid, want_flush_tid);
2023 ret = 0;
2024 }
2025 }
2026 spin_unlock(&mdsc->cap_dirty_lock);
2027 return ret;
2028 }
2029
2030 /*
2031 * flush all dirty inode data to disk.
2032 *
2033 * returns true if we've flushed through want_flush_tid
2034 */
2035 static void wait_caps_flush(struct ceph_mds_client *mdsc,
2036 u64 want_flush_tid)
2037 {
2038 dout("check_caps_flush want %llu\n", want_flush_tid);
2039
2040 wait_event(mdsc->cap_flushing_wq,
2041 check_caps_flush(mdsc, want_flush_tid));
2042
2043 dout("check_caps_flush ok, flushed thru %llu\n", want_flush_tid);
2044 }
2045
2046 /*
2047 * called under s_mutex
2048 */
2049 static void ceph_send_cap_releases(struct ceph_mds_client *mdsc,
2050 struct ceph_mds_session *session)
2051 {
2052 struct ceph_msg *msg = NULL;
2053 struct ceph_mds_cap_release *head;
2054 struct ceph_mds_cap_item *item;
2055 struct ceph_osd_client *osdc = &mdsc->fsc->client->osdc;
2056 struct ceph_cap *cap;
2057 LIST_HEAD(tmp_list);
2058 int num_cap_releases;
2059 __le32 barrier, *cap_barrier;
2060
2061 down_read(&osdc->lock);
2062 barrier = cpu_to_le32(osdc->epoch_barrier);
2063 up_read(&osdc->lock);
2064
2065 spin_lock(&session->s_cap_lock);
2066 again:
2067 list_splice_init(&session->s_cap_releases, &tmp_list);
2068 num_cap_releases = session->s_num_cap_releases;
2069 session->s_num_cap_releases = 0;
2070 spin_unlock(&session->s_cap_lock);
2071
2072 while (!list_empty(&tmp_list)) {
2073 if (!msg) {
2074 msg = ceph_msg_new(CEPH_MSG_CLIENT_CAPRELEASE,
2075 PAGE_SIZE, GFP_NOFS, false);
2076 if (!msg)
2077 goto out_err;
2078 head = msg->front.iov_base;
2079 head->num = cpu_to_le32(0);
2080 msg->front.iov_len = sizeof(*head);
2081
2082 msg->hdr.version = cpu_to_le16(2);
2083 msg->hdr.compat_version = cpu_to_le16(1);
2084 }
2085
2086 cap = list_first_entry(&tmp_list, struct ceph_cap,
2087 session_caps);
2088 list_del(&cap->session_caps);
2089 num_cap_releases--;
2090
2091 head = msg->front.iov_base;
2092 put_unaligned_le32(get_unaligned_le32(&head->num) + 1,
2093 &head->num);
2094 item = msg->front.iov_base + msg->front.iov_len;
2095 item->ino = cpu_to_le64(cap->cap_ino);
2096 item->cap_id = cpu_to_le64(cap->cap_id);
2097 item->migrate_seq = cpu_to_le32(cap->mseq);
2098 item->seq = cpu_to_le32(cap->issue_seq);
2099 msg->front.iov_len += sizeof(*item);
2100
2101 ceph_put_cap(mdsc, cap);
2102
2103 if (le32_to_cpu(head->num) == CEPH_CAPS_PER_RELEASE) {
2104 // Append cap_barrier field
2105 cap_barrier = msg->front.iov_base + msg->front.iov_len;
2106 *cap_barrier = barrier;
2107 msg->front.iov_len += sizeof(*cap_barrier);
2108
2109 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
2110 dout("send_cap_releases mds%d %p\n", session->s_mds, msg);
2111 ceph_con_send(&session->s_con, msg);
2112 msg = NULL;
2113 }
2114 }
2115
2116 BUG_ON(num_cap_releases != 0);
2117
2118 spin_lock(&session->s_cap_lock);
2119 if (!list_empty(&session->s_cap_releases))
2120 goto again;
2121 spin_unlock(&session->s_cap_lock);
2122
2123 if (msg) {
2124 // Append cap_barrier field
2125 cap_barrier = msg->front.iov_base + msg->front.iov_len;
2126 *cap_barrier = barrier;
2127 msg->front.iov_len += sizeof(*cap_barrier);
2128
2129 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
2130 dout("send_cap_releases mds%d %p\n", session->s_mds, msg);
2131 ceph_con_send(&session->s_con, msg);
2132 }
2133 return;
2134 out_err:
2135 pr_err("send_cap_releases mds%d, failed to allocate message\n",
2136 session->s_mds);
2137 spin_lock(&session->s_cap_lock);
2138 list_splice(&tmp_list, &session->s_cap_releases);
2139 session->s_num_cap_releases += num_cap_releases;
2140 spin_unlock(&session->s_cap_lock);
2141 }
2142
2143 static void ceph_cap_release_work(struct work_struct *work)
2144 {
2145 struct ceph_mds_session *session =
2146 container_of(work, struct ceph_mds_session, s_cap_release_work);
2147
2148 mutex_lock(&session->s_mutex);
2149 if (session->s_state == CEPH_MDS_SESSION_OPEN ||
2150 session->s_state == CEPH_MDS_SESSION_HUNG)
2151 ceph_send_cap_releases(session->s_mdsc, session);
2152 mutex_unlock(&session->s_mutex);
2153 ceph_put_mds_session(session);
2154 }
2155
2156 void ceph_flush_cap_releases(struct ceph_mds_client *mdsc,
2157 struct ceph_mds_session *session)
2158 {
2159 if (mdsc->stopping)
2160 return;
2161
2162 ceph_get_mds_session(session);
2163 if (queue_work(mdsc->fsc->cap_wq,
2164 &session->s_cap_release_work)) {
2165 dout("cap release work queued\n");
2166 } else {
2167 ceph_put_mds_session(session);
2168 dout("failed to queue cap release work\n");
2169 }
2170 }
2171
2172 /*
2173 * caller holds session->s_cap_lock
2174 */
2175 void __ceph_queue_cap_release(struct ceph_mds_session *session,
2176 struct ceph_cap *cap)
2177 {
2178 list_add_tail(&cap->session_caps, &session->s_cap_releases);
2179 session->s_num_cap_releases++;
2180
2181 if (!(session->s_num_cap_releases % CEPH_CAPS_PER_RELEASE))
2182 ceph_flush_cap_releases(session->s_mdsc, session);
2183 }
2184
2185 static void ceph_cap_reclaim_work(struct work_struct *work)
2186 {
2187 struct ceph_mds_client *mdsc =
2188 container_of(work, struct ceph_mds_client, cap_reclaim_work);
2189 int ret = ceph_trim_dentries(mdsc);
2190 if (ret == -EAGAIN)
2191 ceph_queue_cap_reclaim_work(mdsc);
2192 }
2193
2194 void ceph_queue_cap_reclaim_work(struct ceph_mds_client *mdsc)
2195 {
2196 if (mdsc->stopping)
2197 return;
2198
2199 if (queue_work(mdsc->fsc->cap_wq, &mdsc->cap_reclaim_work)) {
2200 dout("caps reclaim work queued\n");
2201 } else {
2202 dout("failed to queue caps release work\n");
2203 }
2204 }
2205
2206 void ceph_reclaim_caps_nr(struct ceph_mds_client *mdsc, int nr)
2207 {
2208 int val;
2209 if (!nr)
2210 return;
2211 val = atomic_add_return(nr, &mdsc->cap_reclaim_pending);
2212 if ((val % CEPH_CAPS_PER_RELEASE) < nr) {
2213 atomic_set(&mdsc->cap_reclaim_pending, 0);
2214 ceph_queue_cap_reclaim_work(mdsc);
2215 }
2216 }
2217
2218 /*
2219 * requests
2220 */
2221
2222 int ceph_alloc_readdir_reply_buffer(struct ceph_mds_request *req,
2223 struct inode *dir)
2224 {
2225 struct ceph_inode_info *ci = ceph_inode(dir);
2226 struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
2227 struct ceph_mount_options *opt = req->r_mdsc->fsc->mount_options;
2228 size_t size = sizeof(struct ceph_mds_reply_dir_entry);
2229 unsigned int num_entries;
2230 int order;
2231
2232 spin_lock(&ci->i_ceph_lock);
2233 num_entries = ci->i_files + ci->i_subdirs;
2234 spin_unlock(&ci->i_ceph_lock);
2235 num_entries = max(num_entries, 1U);
2236 num_entries = min(num_entries, opt->max_readdir);
2237
2238 order = get_order(size * num_entries);
2239 while (order >= 0) {
2240 rinfo->dir_entries = (void*)__get_free_pages(GFP_KERNEL |
2241 __GFP_NOWARN,
2242 order);
2243 if (rinfo->dir_entries)
2244 break;
2245 order--;
2246 }
2247 if (!rinfo->dir_entries)
2248 return -ENOMEM;
2249
2250 num_entries = (PAGE_SIZE << order) / size;
2251 num_entries = min(num_entries, opt->max_readdir);
2252
2253 rinfo->dir_buf_size = PAGE_SIZE << order;
2254 req->r_num_caps = num_entries + 1;
2255 req->r_args.readdir.max_entries = cpu_to_le32(num_entries);
2256 req->r_args.readdir.max_bytes = cpu_to_le32(opt->max_readdir_bytes);
2257 return 0;
2258 }
2259
2260 /*
2261 * Create an mds request.
2262 */
2263 struct ceph_mds_request *
2264 ceph_mdsc_create_request(struct ceph_mds_client *mdsc, int op, int mode)
2265 {
2266 struct ceph_mds_request *req;
2267
2268 req = kmem_cache_zalloc(ceph_mds_request_cachep, GFP_NOFS);
2269 if (!req)
2270 return ERR_PTR(-ENOMEM);
2271
2272 mutex_init(&req->r_fill_mutex);
2273 req->r_mdsc = mdsc;
2274 req->r_started = jiffies;
2275 req->r_start_latency = ktime_get();
2276 req->r_resend_mds = -1;
2277 INIT_LIST_HEAD(&req->r_unsafe_dir_item);
2278 INIT_LIST_HEAD(&req->r_unsafe_target_item);
2279 req->r_fmode = -1;
2280 kref_init(&req->r_kref);
2281 RB_CLEAR_NODE(&req->r_node);
2282 INIT_LIST_HEAD(&req->r_wait);
2283 init_completion(&req->r_completion);
2284 init_completion(&req->r_safe_completion);
2285 INIT_LIST_HEAD(&req->r_unsafe_item);
2286
2287 ktime_get_coarse_real_ts64(&req->r_stamp);
2288
2289 req->r_op = op;
2290 req->r_direct_mode = mode;
2291 return req;
2292 }
2293
2294 /*
2295 * return oldest (lowest) request, tid in request tree, 0 if none.
2296 *
2297 * called under mdsc->mutex.
2298 */
2299 static struct ceph_mds_request *__get_oldest_req(struct ceph_mds_client *mdsc)
2300 {
2301 if (RB_EMPTY_ROOT(&mdsc->request_tree))
2302 return NULL;
2303 return rb_entry(rb_first(&mdsc->request_tree),
2304 struct ceph_mds_request, r_node);
2305 }
2306
2307 static inline u64 __get_oldest_tid(struct ceph_mds_client *mdsc)
2308 {
2309 return mdsc->oldest_tid;
2310 }
2311
2312 /*
2313 * Build a dentry's path. Allocate on heap; caller must kfree. Based
2314 * on build_path_from_dentry in fs/cifs/dir.c.
2315 *
2316 * If @stop_on_nosnap, generate path relative to the first non-snapped
2317 * inode.
2318 *
2319 * Encode hidden .snap dirs as a double /, i.e.
2320 * foo/.snap/bar -> foo//bar
2321 */
2322 char *ceph_mdsc_build_path(struct dentry *dentry, int *plen, u64 *pbase,
2323 int stop_on_nosnap)
2324 {
2325 struct dentry *temp;
2326 char *path;
2327 int pos;
2328 unsigned seq;
2329 u64 base;
2330
2331 if (!dentry)
2332 return ERR_PTR(-EINVAL);
2333
2334 path = __getname();
2335 if (!path)
2336 return ERR_PTR(-ENOMEM);
2337 retry:
2338 pos = PATH_MAX - 1;
2339 path[pos] = '\0';
2340
2341 seq = read_seqbegin(&rename_lock);
2342 rcu_read_lock();
2343 temp = dentry;
2344 for (;;) {
2345 struct inode *inode;
2346
2347 spin_lock(&temp->d_lock);
2348 inode = d_inode(temp);
2349 if (inode && ceph_snap(inode) == CEPH_SNAPDIR) {
2350 dout("build_path path+%d: %p SNAPDIR\n",
2351 pos, temp);
2352 } else if (stop_on_nosnap && inode && dentry != temp &&
2353 ceph_snap(inode) == CEPH_NOSNAP) {
2354 spin_unlock(&temp->d_lock);
2355 pos++; /* get rid of any prepended '/' */
2356 break;
2357 } else {
2358 pos -= temp->d_name.len;
2359 if (pos < 0) {
2360 spin_unlock(&temp->d_lock);
2361 break;
2362 }
2363 memcpy(path + pos, temp->d_name.name, temp->d_name.len);
2364 }
2365 spin_unlock(&temp->d_lock);
2366 temp = READ_ONCE(temp->d_parent);
2367
2368 /* Are we at the root? */
2369 if (IS_ROOT(temp))
2370 break;
2371
2372 /* Are we out of buffer? */
2373 if (--pos < 0)
2374 break;
2375
2376 path[pos] = '/';
2377 }
2378 base = ceph_ino(d_inode(temp));
2379 rcu_read_unlock();
2380
2381 if (read_seqretry(&rename_lock, seq))
2382 goto retry;
2383
2384 if (pos < 0) {
2385 /*
2386 * A rename didn't occur, but somehow we didn't end up where
2387 * we thought we would. Throw a warning and try again.
2388 */
2389 pr_warn("build_path did not end path lookup where "
2390 "expected, pos is %d\n", pos);
2391 goto retry;
2392 }
2393
2394 *pbase = base;
2395 *plen = PATH_MAX - 1 - pos;
2396 dout("build_path on %p %d built %llx '%.*s'\n",
2397 dentry, d_count(dentry), base, *plen, path + pos);
2398 return path + pos;
2399 }
2400
2401 static int build_dentry_path(struct dentry *dentry, struct inode *dir,
2402 const char **ppath, int *ppathlen, u64 *pino,
2403 bool *pfreepath, bool parent_locked)
2404 {
2405 char *path;
2406
2407 rcu_read_lock();
2408 if (!dir)
2409 dir = d_inode_rcu(dentry->d_parent);
2410 if (dir && parent_locked && ceph_snap(dir) == CEPH_NOSNAP) {
2411 *pino = ceph_ino(dir);
2412 rcu_read_unlock();
2413 *ppath = dentry->d_name.name;
2414 *ppathlen = dentry->d_name.len;
2415 return 0;
2416 }
2417 rcu_read_unlock();
2418 path = ceph_mdsc_build_path(dentry, ppathlen, pino, 1);
2419 if (IS_ERR(path))
2420 return PTR_ERR(path);
2421 *ppath = path;
2422 *pfreepath = true;
2423 return 0;
2424 }
2425
2426 static int build_inode_path(struct inode *inode,
2427 const char **ppath, int *ppathlen, u64 *pino,
2428 bool *pfreepath)
2429 {
2430 struct dentry *dentry;
2431 char *path;
2432
2433 if (ceph_snap(inode) == CEPH_NOSNAP) {
2434 *pino = ceph_ino(inode);
2435 *ppathlen = 0;
2436 return 0;
2437 }
2438 dentry = d_find_alias(inode);
2439 path = ceph_mdsc_build_path(dentry, ppathlen, pino, 1);
2440 dput(dentry);
2441 if (IS_ERR(path))
2442 return PTR_ERR(path);
2443 *ppath = path;
2444 *pfreepath = true;
2445 return 0;
2446 }
2447
2448 /*
2449 * request arguments may be specified via an inode *, a dentry *, or
2450 * an explicit ino+path.
2451 */
2452 static int set_request_path_attr(struct inode *rinode, struct dentry *rdentry,
2453 struct inode *rdiri, const char *rpath,
2454 u64 rino, const char **ppath, int *pathlen,
2455 u64 *ino, bool *freepath, bool parent_locked)
2456 {
2457 int r = 0;
2458
2459 if (rinode) {
2460 r = build_inode_path(rinode, ppath, pathlen, ino, freepath);
2461 dout(" inode %p %llx.%llx\n", rinode, ceph_ino(rinode),
2462 ceph_snap(rinode));
2463 } else if (rdentry) {
2464 r = build_dentry_path(rdentry, rdiri, ppath, pathlen, ino,
2465 freepath, parent_locked);
2466 dout(" dentry %p %llx/%.*s\n", rdentry, *ino, *pathlen,
2467 *ppath);
2468 } else if (rpath || rino) {
2469 *ino = rino;
2470 *ppath = rpath;
2471 *pathlen = rpath ? strlen(rpath) : 0;
2472 dout(" path %.*s\n", *pathlen, rpath);
2473 }
2474
2475 return r;
2476 }
2477
2478 static void encode_timestamp_and_gids(void **p,
2479 const struct ceph_mds_request *req)
2480 {
2481 struct ceph_timespec ts;
2482 int i;
2483
2484 ceph_encode_timespec64(&ts, &req->r_stamp);
2485 ceph_encode_copy(p, &ts, sizeof(ts));
2486
2487 /* gid_list */
2488 ceph_encode_32(p, req->r_cred->group_info->ngroups);
2489 for (i = 0; i < req->r_cred->group_info->ngroups; i++)
2490 ceph_encode_64(p, from_kgid(&init_user_ns,
2491 req->r_cred->group_info->gid[i]));
2492 }
2493
2494 /*
2495 * called under mdsc->mutex
2496 */
2497 static struct ceph_msg *create_request_message(struct ceph_mds_session *session,
2498 struct ceph_mds_request *req,
2499 bool drop_cap_releases)
2500 {
2501 int mds = session->s_mds;
2502 struct ceph_mds_client *mdsc = session->s_mdsc;
2503 struct ceph_msg *msg;
2504 struct ceph_mds_request_head_old *head;
2505 const char *path1 = NULL;
2506 const char *path2 = NULL;
2507 u64 ino1 = 0, ino2 = 0;
2508 int pathlen1 = 0, pathlen2 = 0;
2509 bool freepath1 = false, freepath2 = false;
2510 int len;
2511 u16 releases;
2512 void *p, *end;
2513 int ret;
2514 bool legacy = !(session->s_con.peer_features & CEPH_FEATURE_FS_BTIME);
2515
2516 ret = set_request_path_attr(req->r_inode, req->r_dentry,
2517 req->r_parent, req->r_path1, req->r_ino1.ino,
2518 &path1, &pathlen1, &ino1, &freepath1,
2519 test_bit(CEPH_MDS_R_PARENT_LOCKED,
2520 &req->r_req_flags));
2521 if (ret < 0) {
2522 msg = ERR_PTR(ret);
2523 goto out;
2524 }
2525
2526 /* If r_old_dentry is set, then assume that its parent is locked */
2527 ret = set_request_path_attr(NULL, req->r_old_dentry,
2528 req->r_old_dentry_dir,
2529 req->r_path2, req->r_ino2.ino,
2530 &path2, &pathlen2, &ino2, &freepath2, true);
2531 if (ret < 0) {
2532 msg = ERR_PTR(ret);
2533 goto out_free1;
2534 }
2535
2536 len = legacy ? sizeof(*head) : sizeof(struct ceph_mds_request_head);
2537 len += pathlen1 + pathlen2 + 2*(1 + sizeof(u32) + sizeof(u64)) +
2538 sizeof(struct ceph_timespec);
2539 len += sizeof(u32) + (sizeof(u64) * req->r_cred->group_info->ngroups);
2540
2541 /* calculate (max) length for cap releases */
2542 len += sizeof(struct ceph_mds_request_release) *
2543 (!!req->r_inode_drop + !!req->r_dentry_drop +
2544 !!req->r_old_inode_drop + !!req->r_old_dentry_drop);
2545
2546 if (req->r_dentry_drop)
2547 len += pathlen1;
2548 if (req->r_old_dentry_drop)
2549 len += pathlen2;
2550
2551 msg = ceph_msg_new2(CEPH_MSG_CLIENT_REQUEST, len, 1, GFP_NOFS, false);
2552 if (!msg) {
2553 msg = ERR_PTR(-ENOMEM);
2554 goto out_free2;
2555 }
2556
2557 msg->hdr.tid = cpu_to_le64(req->r_tid);
2558
2559 /*
2560 * The old ceph_mds_request_head didn't contain a version field, and
2561 * one was added when we moved the message version from 3->4.
2562 */
2563 if (legacy) {
2564 msg->hdr.version = cpu_to_le16(3);
2565 head = msg->front.iov_base;
2566 p = msg->front.iov_base + sizeof(*head);
2567 } else {
2568 struct ceph_mds_request_head *new_head = msg->front.iov_base;
2569
2570 msg->hdr.version = cpu_to_le16(4);
2571 new_head->version = cpu_to_le16(CEPH_MDS_REQUEST_HEAD_VERSION);
2572 head = (struct ceph_mds_request_head_old *)&new_head->oldest_client_tid;
2573 p = msg->front.iov_base + sizeof(*new_head);
2574 }
2575
2576 end = msg->front.iov_base + msg->front.iov_len;
2577
2578 head->mdsmap_epoch = cpu_to_le32(mdsc->mdsmap->m_epoch);
2579 head->op = cpu_to_le32(req->r_op);
2580 head->caller_uid = cpu_to_le32(from_kuid(&init_user_ns,
2581 req->r_cred->fsuid));
2582 head->caller_gid = cpu_to_le32(from_kgid(&init_user_ns,
2583 req->r_cred->fsgid));
2584 head->ino = cpu_to_le64(req->r_deleg_ino);
2585 head->args = req->r_args;
2586
2587 ceph_encode_filepath(&p, end, ino1, path1);
2588 ceph_encode_filepath(&p, end, ino2, path2);
2589
2590 /* make note of release offset, in case we need to replay */
2591 req->r_request_release_offset = p - msg->front.iov_base;
2592
2593 /* cap releases */
2594 releases = 0;
2595 if (req->r_inode_drop)
2596 releases += ceph_encode_inode_release(&p,
2597 req->r_inode ? req->r_inode : d_inode(req->r_dentry),
2598 mds, req->r_inode_drop, req->r_inode_unless,
2599 req->r_op == CEPH_MDS_OP_READDIR);
2600 if (req->r_dentry_drop)
2601 releases += ceph_encode_dentry_release(&p, req->r_dentry,
2602 req->r_parent, mds, req->r_dentry_drop,
2603 req->r_dentry_unless);
2604 if (req->r_old_dentry_drop)
2605 releases += ceph_encode_dentry_release(&p, req->r_old_dentry,
2606 req->r_old_dentry_dir, mds,
2607 req->r_old_dentry_drop,
2608 req->r_old_dentry_unless);
2609 if (req->r_old_inode_drop)
2610 releases += ceph_encode_inode_release(&p,
2611 d_inode(req->r_old_dentry),
2612 mds, req->r_old_inode_drop, req->r_old_inode_unless, 0);
2613
2614 if (drop_cap_releases) {
2615 releases = 0;
2616 p = msg->front.iov_base + req->r_request_release_offset;
2617 }
2618
2619 head->num_releases = cpu_to_le16(releases);
2620
2621 encode_timestamp_and_gids(&p, req);
2622
2623 if (WARN_ON_ONCE(p > end)) {
2624 ceph_msg_put(msg);
2625 msg = ERR_PTR(-ERANGE);
2626 goto out_free2;
2627 }
2628
2629 msg->front.iov_len = p - msg->front.iov_base;
2630 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
2631
2632 if (req->r_pagelist) {
2633 struct ceph_pagelist *pagelist = req->r_pagelist;
2634 ceph_msg_data_add_pagelist(msg, pagelist);
2635 msg->hdr.data_len = cpu_to_le32(pagelist->length);
2636 } else {
2637 msg->hdr.data_len = 0;
2638 }
2639
2640 msg->hdr.data_off = cpu_to_le16(0);
2641
2642 out_free2:
2643 if (freepath2)
2644 ceph_mdsc_free_path((char *)path2, pathlen2);
2645 out_free1:
2646 if (freepath1)
2647 ceph_mdsc_free_path((char *)path1, pathlen1);
2648 out:
2649 return msg;
2650 }
2651
2652 /*
2653 * called under mdsc->mutex if error, under no mutex if
2654 * success.
2655 */
2656 static void complete_request(struct ceph_mds_client *mdsc,
2657 struct ceph_mds_request *req)
2658 {
2659 req->r_end_latency = ktime_get();
2660
2661 if (req->r_callback)
2662 req->r_callback(mdsc, req);
2663 complete_all(&req->r_completion);
2664 }
2665
2666 static struct ceph_mds_request_head_old *
2667 find_old_request_head(void *p, u64 features)
2668 {
2669 bool legacy = !(features & CEPH_FEATURE_FS_BTIME);
2670 struct ceph_mds_request_head *new_head;
2671
2672 if (legacy)
2673 return (struct ceph_mds_request_head_old *)p;
2674 new_head = (struct ceph_mds_request_head *)p;
2675 return (struct ceph_mds_request_head_old *)&new_head->oldest_client_tid;
2676 }
2677
2678 /*
2679 * called under mdsc->mutex
2680 */
2681 static int __prepare_send_request(struct ceph_mds_session *session,
2682 struct ceph_mds_request *req,
2683 bool drop_cap_releases)
2684 {
2685 int mds = session->s_mds;
2686 struct ceph_mds_client *mdsc = session->s_mdsc;
2687 struct ceph_mds_request_head_old *rhead;
2688 struct ceph_msg *msg;
2689 int flags = 0;
2690
2691 req->r_attempts++;
2692 if (req->r_inode) {
2693 struct ceph_cap *cap =
2694 ceph_get_cap_for_mds(ceph_inode(req->r_inode), mds);
2695
2696 if (cap)
2697 req->r_sent_on_mseq = cap->mseq;
2698 else
2699 req->r_sent_on_mseq = -1;
2700 }
2701 dout("prepare_send_request %p tid %lld %s (attempt %d)\n", req,
2702 req->r_tid, ceph_mds_op_name(req->r_op), req->r_attempts);
2703
2704 if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) {
2705 void *p;
2706
2707 /*
2708 * Replay. Do not regenerate message (and rebuild
2709 * paths, etc.); just use the original message.
2710 * Rebuilding paths will break for renames because
2711 * d_move mangles the src name.
2712 */
2713 msg = req->r_request;
2714 rhead = find_old_request_head(msg->front.iov_base,
2715 session->s_con.peer_features);
2716
2717 flags = le32_to_cpu(rhead->flags);
2718 flags |= CEPH_MDS_FLAG_REPLAY;
2719 rhead->flags = cpu_to_le32(flags);
2720
2721 if (req->r_target_inode)
2722 rhead->ino = cpu_to_le64(ceph_ino(req->r_target_inode));
2723
2724 rhead->num_retry = req->r_attempts - 1;
2725
2726 /* remove cap/dentry releases from message */
2727 rhead->num_releases = 0;
2728
2729 p = msg->front.iov_base + req->r_request_release_offset;
2730 encode_timestamp_and_gids(&p, req);
2731
2732 msg->front.iov_len = p - msg->front.iov_base;
2733 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
2734 return 0;
2735 }
2736
2737 if (req->r_request) {
2738 ceph_msg_put(req->r_request);
2739 req->r_request = NULL;
2740 }
2741 msg = create_request_message(session, req, drop_cap_releases);
2742 if (IS_ERR(msg)) {
2743 req->r_err = PTR_ERR(msg);
2744 return PTR_ERR(msg);
2745 }
2746 req->r_request = msg;
2747
2748 rhead = find_old_request_head(msg->front.iov_base,
2749 session->s_con.peer_features);
2750 rhead->oldest_client_tid = cpu_to_le64(__get_oldest_tid(mdsc));
2751 if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags))
2752 flags |= CEPH_MDS_FLAG_REPLAY;
2753 if (test_bit(CEPH_MDS_R_ASYNC, &req->r_req_flags))
2754 flags |= CEPH_MDS_FLAG_ASYNC;
2755 if (req->r_parent)
2756 flags |= CEPH_MDS_FLAG_WANT_DENTRY;
2757 rhead->flags = cpu_to_le32(flags);
2758 rhead->num_fwd = req->r_num_fwd;
2759 rhead->num_retry = req->r_attempts - 1;
2760
2761 dout(" r_parent = %p\n", req->r_parent);
2762 return 0;
2763 }
2764
2765 /*
2766 * called under mdsc->mutex
2767 */
2768 static int __send_request(struct ceph_mds_session *session,
2769 struct ceph_mds_request *req,
2770 bool drop_cap_releases)
2771 {
2772 int err;
2773
2774 err = __prepare_send_request(session, req, drop_cap_releases);
2775 if (!err) {
2776 ceph_msg_get(req->r_request);
2777 ceph_con_send(&session->s_con, req->r_request);
2778 }
2779
2780 return err;
2781 }
2782
2783 /*
2784 * send request, or put it on the appropriate wait list.
2785 */
2786 static void __do_request(struct ceph_mds_client *mdsc,
2787 struct ceph_mds_request *req)
2788 {
2789 struct ceph_mds_session *session = NULL;
2790 int mds = -1;
2791 int err = 0;
2792 bool random;
2793
2794 if (req->r_err || test_bit(CEPH_MDS_R_GOT_RESULT, &req->r_req_flags)) {
2795 if (test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags))
2796 __unregister_request(mdsc, req);
2797 return;
2798 }
2799
2800 if (req->r_timeout &&
2801 time_after_eq(jiffies, req->r_started + req->r_timeout)) {
2802 dout("do_request timed out\n");
2803 err = -ETIMEDOUT;
2804 goto finish;
2805 }
2806 if (READ_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_SHUTDOWN) {
2807 dout("do_request forced umount\n");
2808 err = -EIO;
2809 goto finish;
2810 }
2811 if (READ_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_MOUNTING) {
2812 if (mdsc->mdsmap_err) {
2813 err = mdsc->mdsmap_err;
2814 dout("do_request mdsmap err %d\n", err);
2815 goto finish;
2816 }
2817 if (mdsc->mdsmap->m_epoch == 0) {
2818 dout("do_request no mdsmap, waiting for map\n");
2819 list_add(&req->r_wait, &mdsc->waiting_for_map);
2820 return;
2821 }
2822 if (!(mdsc->fsc->mount_options->flags &
2823 CEPH_MOUNT_OPT_MOUNTWAIT) &&
2824 !ceph_mdsmap_is_cluster_available(mdsc->mdsmap)) {
2825 err = -EHOSTUNREACH;
2826 goto finish;
2827 }
2828 }
2829
2830 put_request_session(req);
2831
2832 mds = __choose_mds(mdsc, req, &random);
2833 if (mds < 0 ||
2834 ceph_mdsmap_get_state(mdsc->mdsmap, mds) < CEPH_MDS_STATE_ACTIVE) {
2835 if (test_bit(CEPH_MDS_R_ASYNC, &req->r_req_flags)) {
2836 err = -EJUKEBOX;
2837 goto finish;
2838 }
2839 dout("do_request no mds or not active, waiting for map\n");
2840 list_add(&req->r_wait, &mdsc->waiting_for_map);
2841 return;
2842 }
2843
2844 /* get, open session */
2845 session = __ceph_lookup_mds_session(mdsc, mds);
2846 if (!session) {
2847 session = register_session(mdsc, mds);
2848 if (IS_ERR(session)) {
2849 err = PTR_ERR(session);
2850 goto finish;
2851 }
2852 }
2853 req->r_session = ceph_get_mds_session(session);
2854
2855 dout("do_request mds%d session %p state %s\n", mds, session,
2856 ceph_session_state_name(session->s_state));
2857 if (session->s_state != CEPH_MDS_SESSION_OPEN &&
2858 session->s_state != CEPH_MDS_SESSION_HUNG) {
2859 /*
2860 * We cannot queue async requests since the caps and delegated
2861 * inodes are bound to the session. Just return -EJUKEBOX and
2862 * let the caller retry a sync request in that case.
2863 */
2864 if (test_bit(CEPH_MDS_R_ASYNC, &req->r_req_flags)) {
2865 err = -EJUKEBOX;
2866 goto out_session;
2867 }
2868
2869 /*
2870 * If the session has been REJECTED, then return a hard error,
2871 * unless it's a CLEANRECOVER mount, in which case we'll queue
2872 * it to the mdsc queue.
2873 */
2874 if (session->s_state == CEPH_MDS_SESSION_REJECTED) {
2875 if (ceph_test_mount_opt(mdsc->fsc, CLEANRECOVER))
2876 list_add(&req->r_wait, &mdsc->waiting_for_map);
2877 else
2878 err = -EACCES;
2879 goto out_session;
2880 }
2881
2882 if (session->s_state == CEPH_MDS_SESSION_NEW ||
2883 session->s_state == CEPH_MDS_SESSION_CLOSING) {
2884 err = __open_session(mdsc, session);
2885 if (err)
2886 goto out_session;
2887 /* retry the same mds later */
2888 if (random)
2889 req->r_resend_mds = mds;
2890 }
2891 list_add(&req->r_wait, &session->s_waiting);
2892 goto out_session;
2893 }
2894
2895 /* send request */
2896 req->r_resend_mds = -1; /* forget any previous mds hint */
2897
2898 if (req->r_request_started == 0) /* note request start time */
2899 req->r_request_started = jiffies;
2900
2901 err = __send_request(session, req, false);
2902
2903 out_session:
2904 ceph_put_mds_session(session);
2905 finish:
2906 if (err) {
2907 dout("__do_request early error %d\n", err);
2908 req->r_err = err;
2909 complete_request(mdsc, req);
2910 __unregister_request(mdsc, req);
2911 }
2912 return;
2913 }
2914
2915 /*
2916 * called under mdsc->mutex
2917 */
2918 static void __wake_requests(struct ceph_mds_client *mdsc,
2919 struct list_head *head)
2920 {
2921 struct ceph_mds_request *req;
2922 LIST_HEAD(tmp_list);
2923
2924 list_splice_init(head, &tmp_list);
2925
2926 while (!list_empty(&tmp_list)) {
2927 req = list_entry(tmp_list.next,
2928 struct ceph_mds_request, r_wait);
2929 list_del_init(&req->r_wait);
2930 dout(" wake request %p tid %llu\n", req, req->r_tid);
2931 __do_request(mdsc, req);
2932 }
2933 }
2934
2935 /*
2936 * Wake up threads with requests pending for @mds, so that they can
2937 * resubmit their requests to a possibly different mds.
2938 */
2939 static void kick_requests(struct ceph_mds_client *mdsc, int mds)
2940 {
2941 struct ceph_mds_request *req;
2942 struct rb_node *p = rb_first(&mdsc->request_tree);
2943
2944 dout("kick_requests mds%d\n", mds);
2945 while (p) {
2946 req = rb_entry(p, struct ceph_mds_request, r_node);
2947 p = rb_next(p);
2948 if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags))
2949 continue;
2950 if (req->r_attempts > 0)
2951 continue; /* only new requests */
2952 if (req->r_session &&
2953 req->r_session->s_mds == mds) {
2954 dout(" kicking tid %llu\n", req->r_tid);
2955 list_del_init(&req->r_wait);
2956 __do_request(mdsc, req);
2957 }
2958 }
2959 }
2960
2961 int ceph_mdsc_submit_request(struct ceph_mds_client *mdsc, struct inode *dir,
2962 struct ceph_mds_request *req)
2963 {
2964 int err = 0;
2965
2966 /* take CAP_PIN refs for r_inode, r_parent, r_old_dentry */
2967 if (req->r_inode)
2968 ceph_get_cap_refs(ceph_inode(req->r_inode), CEPH_CAP_PIN);
2969 if (req->r_parent) {
2970 struct ceph_inode_info *ci = ceph_inode(req->r_parent);
2971 int fmode = (req->r_op & CEPH_MDS_OP_WRITE) ?
2972 CEPH_FILE_MODE_WR : CEPH_FILE_MODE_RD;
2973 spin_lock(&ci->i_ceph_lock);
2974 ceph_take_cap_refs(ci, CEPH_CAP_PIN, false);
2975 __ceph_touch_fmode(ci, mdsc, fmode);
2976 spin_unlock(&ci->i_ceph_lock);
2977 ihold(req->r_parent);
2978 }
2979 if (req->r_old_dentry_dir)
2980 ceph_get_cap_refs(ceph_inode(req->r_old_dentry_dir),
2981 CEPH_CAP_PIN);
2982
2983 if (req->r_inode) {
2984 err = ceph_wait_on_async_create(req->r_inode);
2985 if (err) {
2986 dout("%s: wait for async create returned: %d\n",
2987 __func__, err);
2988 return err;
2989 }
2990 }
2991
2992 if (!err && req->r_old_inode) {
2993 err = ceph_wait_on_async_create(req->r_old_inode);
2994 if (err) {
2995 dout("%s: wait for async create returned: %d\n",
2996 __func__, err);
2997 return err;
2998 }
2999 }
3000
3001 dout("submit_request on %p for inode %p\n", req, dir);
3002 mutex_lock(&mdsc->mutex);
3003 __register_request(mdsc, req, dir);
3004 __do_request(mdsc, req);
3005 err = req->r_err;
3006 mutex_unlock(&mdsc->mutex);
3007 return err;
3008 }
3009
3010 static int ceph_mdsc_wait_request(struct ceph_mds_client *mdsc,
3011 struct ceph_mds_request *req)
3012 {
3013 int err;
3014
3015 /* wait */
3016 dout("do_request waiting\n");
3017 if (!req->r_timeout && req->r_wait_for_completion) {
3018 err = req->r_wait_for_completion(mdsc, req);
3019 } else {
3020 long timeleft = wait_for_completion_killable_timeout(
3021 &req->r_completion,
3022 ceph_timeout_jiffies(req->r_timeout));
3023 if (timeleft > 0)
3024 err = 0;
3025 else if (!timeleft)
3026 err = -ETIMEDOUT; /* timed out */
3027 else
3028 err = timeleft; /* killed */
3029 }
3030 dout("do_request waited, got %d\n", err);
3031 mutex_lock(&mdsc->mutex);
3032
3033 /* only abort if we didn't race with a real reply */
3034 if (test_bit(CEPH_MDS_R_GOT_RESULT, &req->r_req_flags)) {
3035 err = le32_to_cpu(req->r_reply_info.head->result);
3036 } else if (err < 0) {
3037 dout("aborted request %lld with %d\n", req->r_tid, err);
3038
3039 /*
3040 * ensure we aren't running concurrently with
3041 * ceph_fill_trace or ceph_readdir_prepopulate, which
3042 * rely on locks (dir mutex) held by our caller.
3043 */
3044 mutex_lock(&req->r_fill_mutex);
3045 req->r_err = err;
3046 set_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags);
3047 mutex_unlock(&req->r_fill_mutex);
3048
3049 if (req->r_parent &&
3050 (req->r_op & CEPH_MDS_OP_WRITE))
3051 ceph_invalidate_dir_request(req);
3052 } else {
3053 err = req->r_err;
3054 }
3055
3056 mutex_unlock(&mdsc->mutex);
3057 return err;
3058 }
3059
3060 /*
3061 * Synchrously perform an mds request. Take care of all of the
3062 * session setup, forwarding, retry details.
3063 */
3064 int ceph_mdsc_do_request(struct ceph_mds_client *mdsc,
3065 struct inode *dir,
3066 struct ceph_mds_request *req)
3067 {
3068 int err;
3069
3070 dout("do_request on %p\n", req);
3071
3072 /* issue */
3073 err = ceph_mdsc_submit_request(mdsc, dir, req);
3074 if (!err)
3075 err = ceph_mdsc_wait_request(mdsc, req);
3076 dout("do_request %p done, result %d\n", req, err);
3077 return err;
3078 }
3079
3080 /*
3081 * Invalidate dir's completeness, dentry lease state on an aborted MDS
3082 * namespace request.
3083 */
3084 void ceph_invalidate_dir_request(struct ceph_mds_request *req)
3085 {
3086 struct inode *dir = req->r_parent;
3087 struct inode *old_dir = req->r_old_dentry_dir;
3088
3089 dout("invalidate_dir_request %p %p (complete, lease(s))\n", dir, old_dir);
3090
3091 ceph_dir_clear_complete(dir);
3092 if (old_dir)
3093 ceph_dir_clear_complete(old_dir);
3094 if (req->r_dentry)
3095 ceph_invalidate_dentry_lease(req->r_dentry);
3096 if (req->r_old_dentry)
3097 ceph_invalidate_dentry_lease(req->r_old_dentry);
3098 }
3099
3100 /*
3101 * Handle mds reply.
3102 *
3103 * We take the session mutex and parse and process the reply immediately.
3104 * This preserves the logical ordering of replies, capabilities, etc., sent
3105 * by the MDS as they are applied to our local cache.
3106 */
3107 static void handle_reply(struct ceph_mds_session *session, struct ceph_msg *msg)
3108 {
3109 struct ceph_mds_client *mdsc = session->s_mdsc;
3110 struct ceph_mds_request *req;
3111 struct ceph_mds_reply_head *head = msg->front.iov_base;
3112 struct ceph_mds_reply_info_parsed *rinfo; /* parsed reply info */
3113 struct ceph_snap_realm *realm;
3114 u64 tid;
3115 int err, result;
3116 int mds = session->s_mds;
3117
3118 if (msg->front.iov_len < sizeof(*head)) {
3119 pr_err("mdsc_handle_reply got corrupt (short) reply\n");
3120 ceph_msg_dump(msg);
3121 return;
3122 }
3123
3124 /* get request, session */
3125 tid = le64_to_cpu(msg->hdr.tid);
3126 mutex_lock(&mdsc->mutex);
3127 req = lookup_get_request(mdsc, tid);
3128 if (!req) {
3129 dout("handle_reply on unknown tid %llu\n", tid);
3130 mutex_unlock(&mdsc->mutex);
3131 return;
3132 }
3133 dout("handle_reply %p\n", req);
3134
3135 /* correct session? */
3136 if (req->r_session != session) {
3137 pr_err("mdsc_handle_reply got %llu on session mds%d"
3138 " not mds%d\n", tid, session->s_mds,
3139 req->r_session ? req->r_session->s_mds : -1);
3140 mutex_unlock(&mdsc->mutex);
3141 goto out;
3142 }
3143
3144 /* dup? */
3145 if ((test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags) && !head->safe) ||
3146 (test_bit(CEPH_MDS_R_GOT_SAFE, &req->r_req_flags) && head->safe)) {
3147 pr_warn("got a dup %s reply on %llu from mds%d\n",
3148 head->safe ? "safe" : "unsafe", tid, mds);
3149 mutex_unlock(&mdsc->mutex);
3150 goto out;
3151 }
3152 if (test_bit(CEPH_MDS_R_GOT_SAFE, &req->r_req_flags)) {
3153 pr_warn("got unsafe after safe on %llu from mds%d\n",
3154 tid, mds);
3155 mutex_unlock(&mdsc->mutex);
3156 goto out;
3157 }
3158
3159 result = le32_to_cpu(head->result);
3160
3161 /*
3162 * Handle an ESTALE
3163 * if we're not talking to the authority, send to them
3164 * if the authority has changed while we weren't looking,
3165 * send to new authority
3166 * Otherwise we just have to return an ESTALE
3167 */
3168 if (result == -ESTALE) {
3169 dout("got ESTALE on request %llu\n", req->r_tid);
3170 req->r_resend_mds = -1;
3171 if (req->r_direct_mode != USE_AUTH_MDS) {
3172 dout("not using auth, setting for that now\n");
3173 req->r_direct_mode = USE_AUTH_MDS;
3174 __do_request(mdsc, req);
3175 mutex_unlock(&mdsc->mutex);
3176 goto out;
3177 } else {
3178 int mds = __choose_mds(mdsc, req, NULL);
3179 if (mds >= 0 && mds != req->r_session->s_mds) {
3180 dout("but auth changed, so resending\n");
3181 __do_request(mdsc, req);
3182 mutex_unlock(&mdsc->mutex);
3183 goto out;
3184 }
3185 }
3186 dout("have to return ESTALE on request %llu\n", req->r_tid);
3187 }
3188
3189
3190 if (head->safe) {
3191 set_bit(CEPH_MDS_R_GOT_SAFE, &req->r_req_flags);
3192 __unregister_request(mdsc, req);
3193
3194 /* last request during umount? */
3195 if (mdsc->stopping && !__get_oldest_req(mdsc))
3196 complete_all(&mdsc->safe_umount_waiters);
3197
3198 if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) {
3199 /*
3200 * We already handled the unsafe response, now do the
3201 * cleanup. No need to examine the response; the MDS
3202 * doesn't include any result info in the safe
3203 * response. And even if it did, there is nothing
3204 * useful we could do with a revised return value.
3205 */
3206 dout("got safe reply %llu, mds%d\n", tid, mds);
3207
3208 mutex_unlock(&mdsc->mutex);
3209 goto out;
3210 }
3211 } else {
3212 set_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags);
3213 list_add_tail(&req->r_unsafe_item, &req->r_session->s_unsafe);
3214 }
3215
3216 dout("handle_reply tid %lld result %d\n", tid, result);
3217 rinfo = &req->r_reply_info;
3218 if (test_bit(CEPHFS_FEATURE_REPLY_ENCODING, &session->s_features))
3219 err = parse_reply_info(session, msg, rinfo, (u64)-1);
3220 else
3221 err = parse_reply_info(session, msg, rinfo, session->s_con.peer_features);
3222 mutex_unlock(&mdsc->mutex);
3223
3224 /* Must find target inode outside of mutexes to avoid deadlocks */
3225 if ((err >= 0) && rinfo->head->is_target) {
3226 struct inode *in;
3227 struct ceph_vino tvino = {
3228 .ino = le64_to_cpu(rinfo->targeti.in->ino),
3229 .snap = le64_to_cpu(rinfo->targeti.in->snapid)
3230 };
3231
3232 in = ceph_get_inode(mdsc->fsc->sb, tvino);
3233 if (IS_ERR(in)) {
3234 err = PTR_ERR(in);
3235 mutex_lock(&session->s_mutex);
3236 goto out_err;
3237 }
3238 req->r_target_inode = in;
3239 }
3240
3241 mutex_lock(&session->s_mutex);
3242 if (err < 0) {
3243 pr_err("mdsc_handle_reply got corrupt reply mds%d(tid:%lld)\n", mds, tid);
3244 ceph_msg_dump(msg);
3245 goto out_err;
3246 }
3247
3248 /* snap trace */
3249 realm = NULL;
3250 if (rinfo->snapblob_len) {
3251 down_write(&mdsc->snap_rwsem);
3252 ceph_update_snap_trace(mdsc, rinfo->snapblob,
3253 rinfo->snapblob + rinfo->snapblob_len,
3254 le32_to_cpu(head->op) == CEPH_MDS_OP_RMSNAP,
3255 &realm);
3256 downgrade_write(&mdsc->snap_rwsem);
3257 } else {
3258 down_read(&mdsc->snap_rwsem);
3259 }
3260
3261 /* insert trace into our cache */
3262 mutex_lock(&req->r_fill_mutex);
3263 current->journal_info = req;
3264 err = ceph_fill_trace(mdsc->fsc->sb, req);
3265 if (err == 0) {
3266 if (result == 0 && (req->r_op == CEPH_MDS_OP_READDIR ||
3267 req->r_op == CEPH_MDS_OP_LSSNAP))
3268 ceph_readdir_prepopulate(req, req->r_session);
3269 }
3270 current->journal_info = NULL;
3271 mutex_unlock(&req->r_fill_mutex);
3272
3273 up_read(&mdsc->snap_rwsem);
3274 if (realm)
3275 ceph_put_snap_realm(mdsc, realm);
3276
3277 if (err == 0) {
3278 if (req->r_target_inode &&
3279 test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) {
3280 struct ceph_inode_info *ci =
3281 ceph_inode(req->r_target_inode);
3282 spin_lock(&ci->i_unsafe_lock);
3283 list_add_tail(&req->r_unsafe_target_item,
3284 &ci->i_unsafe_iops);
3285 spin_unlock(&ci->i_unsafe_lock);
3286 }
3287
3288 ceph_unreserve_caps(mdsc, &req->r_caps_reservation);
3289 }
3290 out_err:
3291 mutex_lock(&mdsc->mutex);
3292 if (!test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags)) {
3293 if (err) {
3294 req->r_err = err;
3295 } else {
3296 req->r_reply = ceph_msg_get(msg);
3297 set_bit(CEPH_MDS_R_GOT_RESULT, &req->r_req_flags);
3298 }
3299 } else {
3300 dout("reply arrived after request %lld was aborted\n", tid);
3301 }
3302 mutex_unlock(&mdsc->mutex);
3303
3304 mutex_unlock(&session->s_mutex);
3305
3306 /* kick calling process */
3307 complete_request(mdsc, req);
3308
3309 ceph_update_metadata_latency(&mdsc->metric, req->r_start_latency,
3310 req->r_end_latency, err);
3311 out:
3312 ceph_mdsc_put_request(req);
3313 return;
3314 }
3315
3316
3317
3318 /*
3319 * handle mds notification that our request has been forwarded.
3320 */
3321 static void handle_forward(struct ceph_mds_client *mdsc,
3322 struct ceph_mds_session *session,
3323 struct ceph_msg *msg)
3324 {
3325 struct ceph_mds_request *req;
3326 u64 tid = le64_to_cpu(msg->hdr.tid);
3327 u32 next_mds;
3328 u32 fwd_seq;
3329 int err = -EINVAL;
3330 void *p = msg->front.iov_base;
3331 void *end = p + msg->front.iov_len;
3332
3333 ceph_decode_need(&p, end, 2*sizeof(u32), bad);
3334 next_mds = ceph_decode_32(&p);
3335 fwd_seq = ceph_decode_32(&p);
3336
3337 mutex_lock(&mdsc->mutex);
3338 req = lookup_get_request(mdsc, tid);
3339 if (!req) {
3340 dout("forward tid %llu to mds%d - req dne\n", tid, next_mds);
3341 goto out; /* dup reply? */
3342 }
3343
3344 if (test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags)) {
3345 dout("forward tid %llu aborted, unregistering\n", tid);
3346 __unregister_request(mdsc, req);
3347 } else if (fwd_seq <= req->r_num_fwd) {
3348 dout("forward tid %llu to mds%d - old seq %d <= %d\n",
3349 tid, next_mds, req->r_num_fwd, fwd_seq);
3350 } else {
3351 /* resend. forward race not possible; mds would drop */
3352 dout("forward tid %llu to mds%d (we resend)\n", tid, next_mds);
3353 BUG_ON(req->r_err);
3354 BUG_ON(test_bit(CEPH_MDS_R_GOT_RESULT, &req->r_req_flags));
3355 req->r_attempts = 0;
3356 req->r_num_fwd = fwd_seq;
3357 req->r_resend_mds = next_mds;
3358 put_request_session(req);
3359 __do_request(mdsc, req);
3360 }
3361 ceph_mdsc_put_request(req);
3362 out:
3363 mutex_unlock(&mdsc->mutex);
3364 return;
3365
3366 bad:
3367 pr_err("mdsc_handle_forward decode error err=%d\n", err);
3368 }
3369
3370 static int __decode_session_metadata(void **p, void *end,
3371 bool *blocklisted)
3372 {
3373 /* map<string,string> */
3374 u32 n;
3375 bool err_str;
3376 ceph_decode_32_safe(p, end, n, bad);
3377 while (n-- > 0) {
3378 u32 len;
3379 ceph_decode_32_safe(p, end, len, bad);
3380 ceph_decode_need(p, end, len, bad);
3381 err_str = !strncmp(*p, "error_string", len);
3382 *p += len;
3383 ceph_decode_32_safe(p, end, len, bad);
3384 ceph_decode_need(p, end, len, bad);
3385 /*
3386 * Match "blocklisted (blacklisted)" from newer MDSes,
3387 * or "blacklisted" from older MDSes.
3388 */
3389 if (err_str && strnstr(*p, "blacklisted", len))
3390 *blocklisted = true;
3391 *p += len;
3392 }
3393 return 0;
3394 bad:
3395 return -1;
3396 }
3397
3398 /*
3399 * handle a mds session control message
3400 */
3401 static void handle_session(struct ceph_mds_session *session,
3402 struct ceph_msg *msg)
3403 {
3404 struct ceph_mds_client *mdsc = session->s_mdsc;
3405 int mds = session->s_mds;
3406 int msg_version = le16_to_cpu(msg->hdr.version);
3407 void *p = msg->front.iov_base;
3408 void *end = p + msg->front.iov_len;
3409 struct ceph_mds_session_head *h;
3410 u32 op;
3411 u64 seq, features = 0;
3412 int wake = 0;
3413 bool blocklisted = false;
3414
3415 /* decode */
3416 ceph_decode_need(&p, end, sizeof(*h), bad);
3417 h = p;
3418 p += sizeof(*h);
3419
3420 op = le32_to_cpu(h->op);
3421 seq = le64_to_cpu(h->seq);
3422
3423 if (msg_version >= 3) {
3424 u32 len;
3425 /* version >= 2, metadata */
3426 if (__decode_session_metadata(&p, end, &blocklisted) < 0)
3427 goto bad;
3428 /* version >= 3, feature bits */
3429 ceph_decode_32_safe(&p, end, len, bad);
3430 if (len) {
3431 ceph_decode_64_safe(&p, end, features, bad);
3432 p += len - sizeof(features);
3433 }
3434 }
3435
3436 mutex_lock(&mdsc->mutex);
3437 if (op == CEPH_SESSION_CLOSE) {
3438 ceph_get_mds_session(session);
3439 __unregister_session(mdsc, session);
3440 }
3441 /* FIXME: this ttl calculation is generous */
3442 session->s_ttl = jiffies + HZ*mdsc->mdsmap->m_session_autoclose;
3443 mutex_unlock(&mdsc->mutex);
3444
3445 mutex_lock(&session->s_mutex);
3446
3447 dout("handle_session mds%d %s %p state %s seq %llu\n",
3448 mds, ceph_session_op_name(op), session,
3449 ceph_session_state_name(session->s_state), seq);
3450
3451 if (session->s_state == CEPH_MDS_SESSION_HUNG) {
3452 session->s_state = CEPH_MDS_SESSION_OPEN;
3453 pr_info("mds%d came back\n", session->s_mds);
3454 }
3455
3456 switch (op) {
3457 case CEPH_SESSION_OPEN:
3458 if (session->s_state == CEPH_MDS_SESSION_RECONNECTING)
3459 pr_info("mds%d reconnect success\n", session->s_mds);
3460 session->s_state = CEPH_MDS_SESSION_OPEN;
3461 session->s_features = features;
3462 renewed_caps(mdsc, session, 0);
3463 if (test_bit(CEPHFS_FEATURE_METRIC_COLLECT, &session->s_features))
3464 metric_schedule_delayed(&mdsc->metric);
3465 wake = 1;
3466 if (mdsc->stopping)
3467 __close_session(mdsc, session);
3468 break;
3469
3470 case CEPH_SESSION_RENEWCAPS:
3471 if (session->s_renew_seq == seq)
3472 renewed_caps(mdsc, session, 1);
3473 break;
3474
3475 case CEPH_SESSION_CLOSE:
3476 if (session->s_state == CEPH_MDS_SESSION_RECONNECTING)
3477 pr_info("mds%d reconnect denied\n", session->s_mds);
3478 session->s_state = CEPH_MDS_SESSION_CLOSED;
3479 cleanup_session_requests(mdsc, session);
3480 remove_session_caps(session);
3481 wake = 2; /* for good measure */
3482 wake_up_all(&mdsc->session_close_wq);
3483 break;
3484
3485 case CEPH_SESSION_STALE:
3486 pr_info("mds%d caps went stale, renewing\n",
3487 session->s_mds);
3488 spin_lock(&session->s_gen_ttl_lock);
3489 session->s_cap_gen++;
3490 session->s_cap_ttl = jiffies - 1;
3491 spin_unlock(&session->s_gen_ttl_lock);
3492 send_renew_caps(mdsc, session);
3493 break;
3494
3495 case CEPH_SESSION_RECALL_STATE:
3496 ceph_trim_caps(mdsc, session, le32_to_cpu(h->max_caps));
3497 break;
3498
3499 case CEPH_SESSION_FLUSHMSG:
3500 send_flushmsg_ack(mdsc, session, seq);
3501 break;
3502
3503 case CEPH_SESSION_FORCE_RO:
3504 dout("force_session_readonly %p\n", session);
3505 spin_lock(&session->s_cap_lock);
3506 session->s_readonly = true;
3507 spin_unlock(&session->s_cap_lock);
3508 wake_up_session_caps(session, FORCE_RO);
3509 break;
3510
3511 case CEPH_SESSION_REJECT:
3512 WARN_ON(session->s_state != CEPH_MDS_SESSION_OPENING);
3513 pr_info("mds%d rejected session\n", session->s_mds);
3514 session->s_state = CEPH_MDS_SESSION_REJECTED;
3515 cleanup_session_requests(mdsc, session);
3516 remove_session_caps(session);
3517 if (blocklisted)
3518 mdsc->fsc->blocklisted = true;
3519 wake = 2; /* for good measure */
3520 break;
3521
3522 default:
3523 pr_err("mdsc_handle_session bad op %d mds%d\n", op, mds);
3524 WARN_ON(1);
3525 }
3526
3527 mutex_unlock(&session->s_mutex);
3528 if (wake) {
3529 mutex_lock(&mdsc->mutex);
3530 __wake_requests(mdsc, &session->s_waiting);
3531 if (wake == 2)
3532 kick_requests(mdsc, mds);
3533 mutex_unlock(&mdsc->mutex);
3534 }
3535 if (op == CEPH_SESSION_CLOSE)
3536 ceph_put_mds_session(session);
3537 return;
3538
3539 bad:
3540 pr_err("mdsc_handle_session corrupt message mds%d len %d\n", mds,
3541 (int)msg->front.iov_len);
3542 ceph_msg_dump(msg);
3543 return;
3544 }
3545
3546 void ceph_mdsc_release_dir_caps(struct ceph_mds_request *req)
3547 {
3548 int dcaps;
3549
3550 dcaps = xchg(&req->r_dir_caps, 0);
3551 if (dcaps) {
3552 dout("releasing r_dir_caps=%s\n", ceph_cap_string(dcaps));
3553 ceph_put_cap_refs(ceph_inode(req->r_parent), dcaps);
3554 }
3555 }
3556
3557 void ceph_mdsc_release_dir_caps_no_check(struct ceph_mds_request *req)
3558 {
3559 int dcaps;
3560
3561 dcaps = xchg(&req->r_dir_caps, 0);
3562 if (dcaps) {
3563 dout("releasing r_dir_caps=%s\n", ceph_cap_string(dcaps));
3564 ceph_put_cap_refs_no_check_caps(ceph_inode(req->r_parent),
3565 dcaps);
3566 }
3567 }
3568
3569 /*
3570 * called under session->mutex.
3571 */
3572 static void replay_unsafe_requests(struct ceph_mds_client *mdsc,
3573 struct ceph_mds_session *session)
3574 {
3575 struct ceph_mds_request *req, *nreq;
3576 struct rb_node *p;
3577
3578 dout("replay_unsafe_requests mds%d\n", session->s_mds);
3579
3580 mutex_lock(&mdsc->mutex);
3581 list_for_each_entry_safe(req, nreq, &session->s_unsafe, r_unsafe_item)
3582 __send_request(session, req, true);
3583
3584 /*
3585 * also re-send old requests when MDS enters reconnect stage. So that MDS
3586 * can process completed request in clientreplay stage.
3587 */
3588 p = rb_first(&mdsc->request_tree);
3589 while (p) {
3590 req = rb_entry(p, struct ceph_mds_request, r_node);
3591 p = rb_next(p);
3592 if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags))
3593 continue;
3594 if (req->r_attempts == 0)
3595 continue; /* only old requests */
3596 if (!req->r_session)
3597 continue;
3598 if (req->r_session->s_mds != session->s_mds)
3599 continue;
3600
3601 ceph_mdsc_release_dir_caps_no_check(req);
3602
3603 __send_request(session, req, true);
3604 }
3605 mutex_unlock(&mdsc->mutex);
3606 }
3607
3608 static int send_reconnect_partial(struct ceph_reconnect_state *recon_state)
3609 {
3610 struct ceph_msg *reply;
3611 struct ceph_pagelist *_pagelist;
3612 struct page *page;
3613 __le32 *addr;
3614 int err = -ENOMEM;
3615
3616 if (!recon_state->allow_multi)
3617 return -ENOSPC;
3618
3619 /* can't handle message that contains both caps and realm */
3620 BUG_ON(!recon_state->nr_caps == !recon_state->nr_realms);
3621
3622 /* pre-allocate new pagelist */
3623 _pagelist = ceph_pagelist_alloc(GFP_NOFS);
3624 if (!_pagelist)
3625 return -ENOMEM;
3626
3627 reply = ceph_msg_new2(CEPH_MSG_CLIENT_RECONNECT, 0, 1, GFP_NOFS, false);
3628 if (!reply)
3629 goto fail_msg;
3630
3631 /* placeholder for nr_caps */
3632 err = ceph_pagelist_encode_32(_pagelist, 0);
3633 if (err < 0)
3634 goto fail;
3635
3636 if (recon_state->nr_caps) {
3637 /* currently encoding caps */
3638 err = ceph_pagelist_encode_32(recon_state->pagelist, 0);
3639 if (err)
3640 goto fail;
3641 } else {
3642 /* placeholder for nr_realms (currently encoding relams) */
3643 err = ceph_pagelist_encode_32(_pagelist, 0);
3644 if (err < 0)
3645 goto fail;
3646 }
3647
3648 err = ceph_pagelist_encode_8(recon_state->pagelist, 1);
3649 if (err)
3650 goto fail;
3651
3652 page = list_first_entry(&recon_state->pagelist->head, struct page, lru);
3653 addr = kmap_atomic(page);
3654 if (recon_state->nr_caps) {
3655 /* currently encoding caps */
3656 *addr = cpu_to_le32(recon_state->nr_caps);
3657 } else {
3658 /* currently encoding relams */
3659 *(addr + 1) = cpu_to_le32(recon_state->nr_realms);
3660 }
3661 kunmap_atomic(addr);
3662
3663 reply->hdr.version = cpu_to_le16(5);
3664 reply->hdr.compat_version = cpu_to_le16(4);
3665
3666 reply->hdr.data_len = cpu_to_le32(recon_state->pagelist->length);
3667 ceph_msg_data_add_pagelist(reply, recon_state->pagelist);
3668
3669 ceph_con_send(&recon_state->session->s_con, reply);
3670 ceph_pagelist_release(recon_state->pagelist);
3671
3672 recon_state->pagelist = _pagelist;
3673 recon_state->nr_caps = 0;
3674 recon_state->nr_realms = 0;
3675 recon_state->msg_version = 5;
3676 return 0;
3677 fail:
3678 ceph_msg_put(reply);
3679 fail_msg:
3680 ceph_pagelist_release(_pagelist);
3681 return err;
3682 }
3683
3684 static struct dentry* d_find_primary(struct inode *inode)
3685 {
3686 struct dentry *alias, *dn = NULL;
3687
3688 if (hlist_empty(&inode->i_dentry))
3689 return NULL;
3690
3691 spin_lock(&inode->i_lock);
3692 if (hlist_empty(&inode->i_dentry))
3693 goto out_unlock;
3694
3695 if (S_ISDIR(inode->i_mode)) {
3696 alias = hlist_entry(inode->i_dentry.first, struct dentry, d_u.d_alias);
3697 if (!IS_ROOT(alias))
3698 dn = dget(alias);
3699 goto out_unlock;
3700 }
3701
3702 hlist_for_each_entry(alias, &inode->i_dentry, d_u.d_alias) {
3703 spin_lock(&alias->d_lock);
3704 if (!d_unhashed(alias) &&
3705 (ceph_dentry(alias)->flags & CEPH_DENTRY_PRIMARY_LINK)) {
3706 dn = dget_dlock(alias);
3707 }
3708 spin_unlock(&alias->d_lock);
3709 if (dn)
3710 break;
3711 }
3712 out_unlock:
3713 spin_unlock(&inode->i_lock);
3714 return dn;
3715 }
3716
3717 /*
3718 * Encode information about a cap for a reconnect with the MDS.
3719 */
3720 static int reconnect_caps_cb(struct inode *inode, struct ceph_cap *cap,
3721 void *arg)
3722 {
3723 union {
3724 struct ceph_mds_cap_reconnect v2;
3725 struct ceph_mds_cap_reconnect_v1 v1;
3726 } rec;
3727 struct ceph_inode_info *ci = cap->ci;
3728 struct ceph_reconnect_state *recon_state = arg;
3729 struct ceph_pagelist *pagelist = recon_state->pagelist;
3730 struct dentry *dentry;
3731 char *path;
3732 int pathlen, err;
3733 u64 pathbase;
3734 u64 snap_follows;
3735
3736 dout(" adding %p ino %llx.%llx cap %p %lld %s\n",
3737 inode, ceph_vinop(inode), cap, cap->cap_id,
3738 ceph_cap_string(cap->issued));
3739
3740 dentry = d_find_primary(inode);
3741 if (dentry) {
3742 /* set pathbase to parent dir when msg_version >= 2 */
3743 path = ceph_mdsc_build_path(dentry, &pathlen, &pathbase,
3744 recon_state->msg_version >= 2);
3745 dput(dentry);
3746 if (IS_ERR(path)) {
3747 err = PTR_ERR(path);
3748 goto out_err;
3749 }
3750 } else {
3751 path = NULL;
3752 pathlen = 0;
3753 pathbase = 0;
3754 }
3755
3756 spin_lock(&ci->i_ceph_lock);
3757 cap->seq = 0; /* reset cap seq */
3758 cap->issue_seq = 0; /* and issue_seq */
3759 cap->mseq = 0; /* and migrate_seq */
3760 cap->cap_gen = cap->session->s_cap_gen;
3761
3762 /* These are lost when the session goes away */
3763 if (S_ISDIR(inode->i_mode)) {
3764 if (cap->issued & CEPH_CAP_DIR_CREATE) {
3765 ceph_put_string(rcu_dereference_raw(ci->i_cached_layout.pool_ns));
3766 memset(&ci->i_cached_layout, 0, sizeof(ci->i_cached_layout));
3767 }
3768 cap->issued &= ~CEPH_CAP_ANY_DIR_OPS;
3769 }
3770
3771 if (recon_state->msg_version >= 2) {
3772 rec.v2.cap_id = cpu_to_le64(cap->cap_id);
3773 rec.v2.wanted = cpu_to_le32(__ceph_caps_wanted(ci));
3774 rec.v2.issued = cpu_to_le32(cap->issued);
3775 rec.v2.snaprealm = cpu_to_le64(ci->i_snap_realm->ino);
3776 rec.v2.pathbase = cpu_to_le64(pathbase);
3777 rec.v2.flock_len = (__force __le32)
3778 ((ci->i_ceph_flags & CEPH_I_ERROR_FILELOCK) ? 0 : 1);
3779 } else {
3780 rec.v1.cap_id = cpu_to_le64(cap->cap_id);
3781 rec.v1.wanted = cpu_to_le32(__ceph_caps_wanted(ci));
3782 rec.v1.issued = cpu_to_le32(cap->issued);
3783 rec.v1.size = cpu_to_le64(inode->i_size);
3784 ceph_encode_timespec64(&rec.v1.mtime, &inode->i_mtime);
3785 ceph_encode_timespec64(&rec.v1.atime, &inode->i_atime);
3786 rec.v1.snaprealm = cpu_to_le64(ci->i_snap_realm->ino);
3787 rec.v1.pathbase = cpu_to_le64(pathbase);
3788 }
3789
3790 if (list_empty(&ci->i_cap_snaps)) {
3791 snap_follows = ci->i_head_snapc ? ci->i_head_snapc->seq : 0;
3792 } else {
3793 struct ceph_cap_snap *capsnap =
3794 list_first_entry(&ci->i_cap_snaps,
3795 struct ceph_cap_snap, ci_item);
3796 snap_follows = capsnap->follows;
3797 }
3798 spin_unlock(&ci->i_ceph_lock);
3799
3800 if (recon_state->msg_version >= 2) {
3801 int num_fcntl_locks, num_flock_locks;
3802 struct ceph_filelock *flocks = NULL;
3803 size_t struct_len, total_len = sizeof(u64);
3804 u8 struct_v = 0;
3805
3806 encode_again:
3807 if (rec.v2.flock_len) {
3808 ceph_count_locks(inode, &num_fcntl_locks, &num_flock_locks);
3809 } else {
3810 num_fcntl_locks = 0;
3811 num_flock_locks = 0;
3812 }
3813 if (num_fcntl_locks + num_flock_locks > 0) {
3814 flocks = kmalloc_array(num_fcntl_locks + num_flock_locks,
3815 sizeof(struct ceph_filelock),
3816 GFP_NOFS);
3817 if (!flocks) {
3818 err = -ENOMEM;
3819 goto out_err;
3820 }
3821 err = ceph_encode_locks_to_buffer(inode, flocks,
3822 num_fcntl_locks,
3823 num_flock_locks);
3824 if (err) {
3825 kfree(flocks);
3826 flocks = NULL;
3827 if (err == -ENOSPC)
3828 goto encode_again;
3829 goto out_err;
3830 }
3831 } else {
3832 kfree(flocks);
3833 flocks = NULL;
3834 }
3835
3836 if (recon_state->msg_version >= 3) {
3837 /* version, compat_version and struct_len */
3838 total_len += 2 * sizeof(u8) + sizeof(u32);
3839 struct_v = 2;
3840 }
3841 /*
3842 * number of encoded locks is stable, so copy to pagelist
3843 */
3844 struct_len = 2 * sizeof(u32) +
3845 (num_fcntl_locks + num_flock_locks) *
3846 sizeof(struct ceph_filelock);
3847 rec.v2.flock_len = cpu_to_le32(struct_len);
3848
3849 struct_len += sizeof(u32) + pathlen + sizeof(rec.v2);
3850
3851 if (struct_v >= 2)
3852 struct_len += sizeof(u64); /* snap_follows */
3853
3854 total_len += struct_len;
3855
3856 if (pagelist->length + total_len > RECONNECT_MAX_SIZE) {
3857 err = send_reconnect_partial(recon_state);
3858 if (err)
3859 goto out_freeflocks;
3860 pagelist = recon_state->pagelist;
3861 }
3862
3863 err = ceph_pagelist_reserve(pagelist, total_len);
3864 if (err)
3865 goto out_freeflocks;
3866
3867 ceph_pagelist_encode_64(pagelist, ceph_ino(inode));
3868 if (recon_state->msg_version >= 3) {
3869 ceph_pagelist_encode_8(pagelist, struct_v);
3870 ceph_pagelist_encode_8(pagelist, 1);
3871 ceph_pagelist_encode_32(pagelist, struct_len);
3872 }
3873 ceph_pagelist_encode_string(pagelist, path, pathlen);
3874 ceph_pagelist_append(pagelist, &rec, sizeof(rec.v2));
3875 ceph_locks_to_pagelist(flocks, pagelist,
3876 num_fcntl_locks, num_flock_locks);
3877 if (struct_v >= 2)
3878 ceph_pagelist_encode_64(pagelist, snap_follows);
3879 out_freeflocks:
3880 kfree(flocks);
3881 } else {
3882 err = ceph_pagelist_reserve(pagelist,
3883 sizeof(u64) + sizeof(u32) +
3884 pathlen + sizeof(rec.v1));
3885 if (err)
3886 goto out_err;
3887
3888 ceph_pagelist_encode_64(pagelist, ceph_ino(inode));
3889 ceph_pagelist_encode_string(pagelist, path, pathlen);
3890 ceph_pagelist_append(pagelist, &rec, sizeof(rec.v1));
3891 }
3892
3893 out_err:
3894 ceph_mdsc_free_path(path, pathlen);
3895 if (!err)
3896 recon_state->nr_caps++;
3897 return err;
3898 }
3899
3900 static int encode_snap_realms(struct ceph_mds_client *mdsc,
3901 struct ceph_reconnect_state *recon_state)
3902 {
3903 struct rb_node *p;
3904 struct ceph_pagelist *pagelist = recon_state->pagelist;
3905 int err = 0;
3906
3907 if (recon_state->msg_version >= 4) {
3908 err = ceph_pagelist_encode_32(pagelist, mdsc->num_snap_realms);
3909 if (err < 0)
3910 goto fail;
3911 }
3912
3913 /*
3914 * snaprealms. we provide mds with the ino, seq (version), and
3915 * parent for all of our realms. If the mds has any newer info,
3916 * it will tell us.
3917 */
3918 for (p = rb_first(&mdsc->snap_realms); p; p = rb_next(p)) {
3919 struct ceph_snap_realm *realm =
3920 rb_entry(p, struct ceph_snap_realm, node);
3921 struct ceph_mds_snaprealm_reconnect sr_rec;
3922
3923 if (recon_state->msg_version >= 4) {
3924 size_t need = sizeof(u8) * 2 + sizeof(u32) +
3925 sizeof(sr_rec);
3926
3927 if (pagelist->length + need > RECONNECT_MAX_SIZE) {
3928 err = send_reconnect_partial(recon_state);
3929 if (err)
3930 goto fail;
3931 pagelist = recon_state->pagelist;
3932 }
3933
3934 err = ceph_pagelist_reserve(pagelist, need);
3935 if (err)
3936 goto fail;
3937
3938 ceph_pagelist_encode_8(pagelist, 1);
3939 ceph_pagelist_encode_8(pagelist, 1);
3940 ceph_pagelist_encode_32(pagelist, sizeof(sr_rec));
3941 }
3942
3943 dout(" adding snap realm %llx seq %lld parent %llx\n",
3944 realm->ino, realm->seq, realm->parent_ino);
3945 sr_rec.ino = cpu_to_le64(realm->ino);
3946 sr_rec.seq = cpu_to_le64(realm->seq);
3947 sr_rec.parent = cpu_to_le64(realm->parent_ino);
3948
3949 err = ceph_pagelist_append(pagelist, &sr_rec, sizeof(sr_rec));
3950 if (err)
3951 goto fail;
3952
3953 recon_state->nr_realms++;
3954 }
3955 fail:
3956 return err;
3957 }
3958
3959
3960 /*
3961 * If an MDS fails and recovers, clients need to reconnect in order to
3962 * reestablish shared state. This includes all caps issued through
3963 * this session _and_ the snap_realm hierarchy. Because it's not
3964 * clear which snap realms the mds cares about, we send everything we
3965 * know about.. that ensures we'll then get any new info the
3966 * recovering MDS might have.
3967 *
3968 * This is a relatively heavyweight operation, but it's rare.
3969 */
3970 static void send_mds_reconnect(struct ceph_mds_client *mdsc,
3971 struct ceph_mds_session *session)
3972 {
3973 struct ceph_msg *reply;
3974 int mds = session->s_mds;
3975 int err = -ENOMEM;
3976 struct ceph_reconnect_state recon_state = {
3977 .session = session,
3978 };
3979 LIST_HEAD(dispose);
3980
3981 pr_info("mds%d reconnect start\n", mds);
3982
3983 recon_state.pagelist = ceph_pagelist_alloc(GFP_NOFS);
3984 if (!recon_state.pagelist)
3985 goto fail_nopagelist;
3986
3987 reply = ceph_msg_new2(CEPH_MSG_CLIENT_RECONNECT, 0, 1, GFP_NOFS, false);
3988 if (!reply)
3989 goto fail_nomsg;
3990
3991 xa_destroy(&session->s_delegated_inos);
3992
3993 mutex_lock(&session->s_mutex);
3994 session->s_state = CEPH_MDS_SESSION_RECONNECTING;
3995 session->s_seq = 0;
3996
3997 dout("session %p state %s\n", session,
3998 ceph_session_state_name(session->s_state));
3999
4000 spin_lock(&session->s_gen_ttl_lock);
4001 session->s_cap_gen++;
4002 spin_unlock(&session->s_gen_ttl_lock);
4003
4004 spin_lock(&session->s_cap_lock);
4005 /* don't know if session is readonly */
4006 session->s_readonly = 0;
4007 /*
4008 * notify __ceph_remove_cap() that we are composing cap reconnect.
4009 * If a cap get released before being added to the cap reconnect,
4010 * __ceph_remove_cap() should skip queuing cap release.
4011 */
4012 session->s_cap_reconnect = 1;
4013 /* drop old cap expires; we're about to reestablish that state */
4014 detach_cap_releases(session, &dispose);
4015 spin_unlock(&session->s_cap_lock);
4016 dispose_cap_releases(mdsc, &dispose);
4017
4018 /* trim unused caps to reduce MDS's cache rejoin time */
4019 if (mdsc->fsc->sb->s_root)
4020 shrink_dcache_parent(mdsc->fsc->sb->s_root);
4021
4022 ceph_con_close(&session->s_con);
4023 ceph_con_open(&session->s_con,
4024 CEPH_ENTITY_TYPE_MDS, mds,
4025 ceph_mdsmap_get_addr(mdsc->mdsmap, mds));
4026
4027 /* replay unsafe requests */
4028 replay_unsafe_requests(mdsc, session);
4029
4030 ceph_early_kick_flushing_caps(mdsc, session);
4031
4032 down_read(&mdsc->snap_rwsem);
4033
4034 /* placeholder for nr_caps */
4035 err = ceph_pagelist_encode_32(recon_state.pagelist, 0);
4036 if (err)
4037 goto fail;
4038
4039 if (test_bit(CEPHFS_FEATURE_MULTI_RECONNECT, &session->s_features)) {
4040 recon_state.msg_version = 3;
4041 recon_state.allow_multi = true;
4042 } else if (session->s_con.peer_features & CEPH_FEATURE_MDSENC) {
4043 recon_state.msg_version = 3;
4044 } else {
4045 recon_state.msg_version = 2;
4046 }
4047 /* trsaverse this session's caps */
4048 err = ceph_iterate_session_caps(session, reconnect_caps_cb, &recon_state);
4049
4050 spin_lock(&session->s_cap_lock);
4051 session->s_cap_reconnect = 0;
4052 spin_unlock(&session->s_cap_lock);
4053
4054 if (err < 0)
4055 goto fail;
4056
4057 /* check if all realms can be encoded into current message */
4058 if (mdsc->num_snap_realms) {
4059 size_t total_len =
4060 recon_state.pagelist->length +
4061 mdsc->num_snap_realms *
4062 sizeof(struct ceph_mds_snaprealm_reconnect);
4063 if (recon_state.msg_version >= 4) {
4064 /* number of realms */
4065 total_len += sizeof(u32);
4066 /* version, compat_version and struct_len */
4067 total_len += mdsc->num_snap_realms *
4068 (2 * sizeof(u8) + sizeof(u32));
4069 }
4070 if (total_len > RECONNECT_MAX_SIZE) {
4071 if (!recon_state.allow_multi) {
4072 err = -ENOSPC;
4073 goto fail;
4074 }
4075 if (recon_state.nr_caps) {
4076 err = send_reconnect_partial(&recon_state);
4077 if (err)
4078 goto fail;
4079 }
4080 recon_state.msg_version = 5;
4081 }
4082 }
4083
4084 err = encode_snap_realms(mdsc, &recon_state);
4085 if (err < 0)
4086 goto fail;
4087
4088 if (recon_state.msg_version >= 5) {
4089 err = ceph_pagelist_encode_8(recon_state.pagelist, 0);
4090 if (err < 0)
4091 goto fail;
4092 }
4093
4094 if (recon_state.nr_caps || recon_state.nr_realms) {
4095 struct page *page =
4096 list_first_entry(&recon_state.pagelist->head,
4097 struct page, lru);
4098 __le32 *addr = kmap_atomic(page);
4099 if (recon_state.nr_caps) {
4100 WARN_ON(recon_state.nr_realms != mdsc->num_snap_realms);
4101 *addr = cpu_to_le32(recon_state.nr_caps);
4102 } else if (recon_state.msg_version >= 4) {
4103 *(addr + 1) = cpu_to_le32(recon_state.nr_realms);
4104 }
4105 kunmap_atomic(addr);
4106 }
4107
4108 reply->hdr.version = cpu_to_le16(recon_state.msg_version);
4109 if (recon_state.msg_version >= 4)
4110 reply->hdr.compat_version = cpu_to_le16(4);
4111
4112 reply->hdr.data_len = cpu_to_le32(recon_state.pagelist->length);
4113 ceph_msg_data_add_pagelist(reply, recon_state.pagelist);
4114
4115 ceph_con_send(&session->s_con, reply);
4116
4117 mutex_unlock(&session->s_mutex);
4118
4119 mutex_lock(&mdsc->mutex);
4120 __wake_requests(mdsc, &session->s_waiting);
4121 mutex_unlock(&mdsc->mutex);
4122
4123 up_read(&mdsc->snap_rwsem);
4124 ceph_pagelist_release(recon_state.pagelist);
4125 return;
4126
4127 fail:
4128 ceph_msg_put(reply);
4129 up_read(&mdsc->snap_rwsem);
4130 mutex_unlock(&session->s_mutex);
4131 fail_nomsg:
4132 ceph_pagelist_release(recon_state.pagelist);
4133 fail_nopagelist:
4134 pr_err("error %d preparing reconnect for mds%d\n", err, mds);
4135 return;
4136 }
4137
4138
4139 /*
4140 * compare old and new mdsmaps, kicking requests
4141 * and closing out old connections as necessary
4142 *
4143 * called under mdsc->mutex.
4144 */
4145 static void check_new_map(struct ceph_mds_client *mdsc,
4146 struct ceph_mdsmap *newmap,
4147 struct ceph_mdsmap *oldmap)
4148 {
4149 int i;
4150 int oldstate, newstate;
4151 struct ceph_mds_session *s;
4152
4153 dout("check_new_map new %u old %u\n",
4154 newmap->m_epoch, oldmap->m_epoch);
4155
4156 for (i = 0; i < oldmap->possible_max_rank && i < mdsc->max_sessions; i++) {
4157 if (!mdsc->sessions[i])
4158 continue;
4159 s = mdsc->sessions[i];
4160 oldstate = ceph_mdsmap_get_state(oldmap, i);
4161 newstate = ceph_mdsmap_get_state(newmap, i);
4162
4163 dout("check_new_map mds%d state %s%s -> %s%s (session %s)\n",
4164 i, ceph_mds_state_name(oldstate),
4165 ceph_mdsmap_is_laggy(oldmap, i) ? " (laggy)" : "",
4166 ceph_mds_state_name(newstate),
4167 ceph_mdsmap_is_laggy(newmap, i) ? " (laggy)" : "",
4168 ceph_session_state_name(s->s_state));
4169
4170 if (i >= newmap->possible_max_rank) {
4171 /* force close session for stopped mds */
4172 ceph_get_mds_session(s);
4173 __unregister_session(mdsc, s);
4174 __wake_requests(mdsc, &s->s_waiting);
4175 mutex_unlock(&mdsc->mutex);
4176
4177 mutex_lock(&s->s_mutex);
4178 cleanup_session_requests(mdsc, s);
4179 remove_session_caps(s);
4180 mutex_unlock(&s->s_mutex);
4181
4182 ceph_put_mds_session(s);
4183
4184 mutex_lock(&mdsc->mutex);
4185 kick_requests(mdsc, i);
4186 continue;
4187 }
4188
4189 if (memcmp(ceph_mdsmap_get_addr(oldmap, i),
4190 ceph_mdsmap_get_addr(newmap, i),
4191 sizeof(struct ceph_entity_addr))) {
4192 /* just close it */
4193 mutex_unlock(&mdsc->mutex);
4194 mutex_lock(&s->s_mutex);
4195 mutex_lock(&mdsc->mutex);
4196 ceph_con_close(&s->s_con);
4197 mutex_unlock(&s->s_mutex);
4198 s->s_state = CEPH_MDS_SESSION_RESTARTING;
4199 } else if (oldstate == newstate) {
4200 continue; /* nothing new with this mds */
4201 }
4202
4203 /*
4204 * send reconnect?
4205 */
4206 if (s->s_state == CEPH_MDS_SESSION_RESTARTING &&
4207 newstate >= CEPH_MDS_STATE_RECONNECT) {
4208 mutex_unlock(&mdsc->mutex);
4209 send_mds_reconnect(mdsc, s);
4210 mutex_lock(&mdsc->mutex);
4211 }
4212
4213 /*
4214 * kick request on any mds that has gone active.
4215 */
4216 if (oldstate < CEPH_MDS_STATE_ACTIVE &&
4217 newstate >= CEPH_MDS_STATE_ACTIVE) {
4218 if (oldstate != CEPH_MDS_STATE_CREATING &&
4219 oldstate != CEPH_MDS_STATE_STARTING)
4220 pr_info("mds%d recovery completed\n", s->s_mds);
4221 kick_requests(mdsc, i);
4222 mutex_unlock(&mdsc->mutex);
4223 mutex_lock(&s->s_mutex);
4224 mutex_lock(&mdsc->mutex);
4225 ceph_kick_flushing_caps(mdsc, s);
4226 mutex_unlock(&s->s_mutex);
4227 wake_up_session_caps(s, RECONNECT);
4228 }
4229 }
4230
4231 for (i = 0; i < newmap->possible_max_rank && i < mdsc->max_sessions; i++) {
4232 s = mdsc->sessions[i];
4233 if (!s)
4234 continue;
4235 if (!ceph_mdsmap_is_laggy(newmap, i))
4236 continue;
4237 if (s->s_state == CEPH_MDS_SESSION_OPEN ||
4238 s->s_state == CEPH_MDS_SESSION_HUNG ||
4239 s->s_state == CEPH_MDS_SESSION_CLOSING) {
4240 dout(" connecting to export targets of laggy mds%d\n",
4241 i);
4242 __open_export_target_sessions(mdsc, s);
4243 }
4244 }
4245 }
4246
4247
4248
4249 /*
4250 * leases
4251 */
4252
4253 /*
4254 * caller must hold session s_mutex, dentry->d_lock
4255 */
4256 void __ceph_mdsc_drop_dentry_lease(struct dentry *dentry)
4257 {
4258 struct ceph_dentry_info *di = ceph_dentry(dentry);
4259
4260 ceph_put_mds_session(di->lease_session);
4261 di->lease_session = NULL;
4262 }
4263
4264 static void handle_lease(struct ceph_mds_client *mdsc,
4265 struct ceph_mds_session *session,
4266 struct ceph_msg *msg)
4267 {
4268 struct super_block *sb = mdsc->fsc->sb;
4269 struct inode *inode;
4270 struct dentry *parent, *dentry;
4271 struct ceph_dentry_info *di;
4272 int mds = session->s_mds;
4273 struct ceph_mds_lease *h = msg->front.iov_base;
4274 u32 seq;
4275 struct ceph_vino vino;
4276 struct qstr dname;
4277 int release = 0;
4278
4279 dout("handle_lease from mds%d\n", mds);
4280
4281 /* decode */
4282 if (msg->front.iov_len < sizeof(*h) + sizeof(u32))
4283 goto bad;
4284 vino.ino = le64_to_cpu(h->ino);
4285 vino.snap = CEPH_NOSNAP;
4286 seq = le32_to_cpu(h->seq);
4287 dname.len = get_unaligned_le32(h + 1);
4288 if (msg->front.iov_len < sizeof(*h) + sizeof(u32) + dname.len)
4289 goto bad;
4290 dname.name = (void *)(h + 1) + sizeof(u32);
4291
4292 /* lookup inode */
4293 inode = ceph_find_inode(sb, vino);
4294 dout("handle_lease %s, ino %llx %p %.*s\n",
4295 ceph_lease_op_name(h->action), vino.ino, inode,
4296 dname.len, dname.name);
4297
4298 mutex_lock(&session->s_mutex);
4299 inc_session_sequence(session);
4300
4301 if (!inode) {
4302 dout("handle_lease no inode %llx\n", vino.ino);
4303 goto release;
4304 }
4305
4306 /* dentry */
4307 parent = d_find_alias(inode);
4308 if (!parent) {
4309 dout("no parent dentry on inode %p\n", inode);
4310 WARN_ON(1);
4311 goto release; /* hrm... */
4312 }
4313 dname.hash = full_name_hash(parent, dname.name, dname.len);
4314 dentry = d_lookup(parent, &dname);
4315 dput(parent);
4316 if (!dentry)
4317 goto release;
4318
4319 spin_lock(&dentry->d_lock);
4320 di = ceph_dentry(dentry);
4321 switch (h->action) {
4322 case CEPH_MDS_LEASE_REVOKE:
4323 if (di->lease_session == session) {
4324 if (ceph_seq_cmp(di->lease_seq, seq) > 0)
4325 h->seq = cpu_to_le32(di->lease_seq);
4326 __ceph_mdsc_drop_dentry_lease(dentry);
4327 }
4328 release = 1;
4329 break;
4330
4331 case CEPH_MDS_LEASE_RENEW:
4332 if (di->lease_session == session &&
4333 di->lease_gen == session->s_cap_gen &&
4334 di->lease_renew_from &&
4335 di->lease_renew_after == 0) {
4336 unsigned long duration =
4337 msecs_to_jiffies(le32_to_cpu(h->duration_ms));
4338
4339 di->lease_seq = seq;
4340 di->time = di->lease_renew_from + duration;
4341 di->lease_renew_after = di->lease_renew_from +
4342 (duration >> 1);
4343 di->lease_renew_from = 0;
4344 }
4345 break;
4346 }
4347 spin_unlock(&dentry->d_lock);
4348 dput(dentry);
4349
4350 if (!release)
4351 goto out;
4352
4353 release:
4354 /* let's just reuse the same message */
4355 h->action = CEPH_MDS_LEASE_REVOKE_ACK;
4356 ceph_msg_get(msg);
4357 ceph_con_send(&session->s_con, msg);
4358
4359 out:
4360 mutex_unlock(&session->s_mutex);
4361 /* avoid calling iput_final() in mds dispatch threads */
4362 ceph_async_iput(inode);
4363 return;
4364
4365 bad:
4366 pr_err("corrupt lease message\n");
4367 ceph_msg_dump(msg);
4368 }
4369
4370 void ceph_mdsc_lease_send_msg(struct ceph_mds_session *session,
4371 struct dentry *dentry, char action,
4372 u32 seq)
4373 {
4374 struct ceph_msg *msg;
4375 struct ceph_mds_lease *lease;
4376 struct inode *dir;
4377 int len = sizeof(*lease) + sizeof(u32) + NAME_MAX;
4378
4379 dout("lease_send_msg identry %p %s to mds%d\n",
4380 dentry, ceph_lease_op_name(action), session->s_mds);
4381
4382 msg = ceph_msg_new(CEPH_MSG_CLIENT_LEASE, len, GFP_NOFS, false);
4383 if (!msg)
4384 return;
4385 lease = msg->front.iov_base;
4386 lease->action = action;
4387 lease->seq = cpu_to_le32(seq);
4388
4389 spin_lock(&dentry->d_lock);
4390 dir = d_inode(dentry->d_parent);
4391 lease->ino = cpu_to_le64(ceph_ino(dir));
4392 lease->first = lease->last = cpu_to_le64(ceph_snap(dir));
4393
4394 put_unaligned_le32(dentry->d_name.len, lease + 1);
4395 memcpy((void *)(lease + 1) + 4,
4396 dentry->d_name.name, dentry->d_name.len);
4397 spin_unlock(&dentry->d_lock);
4398 /*
4399 * if this is a preemptive lease RELEASE, no need to
4400 * flush request stream, since the actual request will
4401 * soon follow.
4402 */
4403 msg->more_to_follow = (action == CEPH_MDS_LEASE_RELEASE);
4404
4405 ceph_con_send(&session->s_con, msg);
4406 }
4407
4408 /*
4409 * lock unlock sessions, to wait ongoing session activities
4410 */
4411 static void lock_unlock_sessions(struct ceph_mds_client *mdsc)
4412 {
4413 int i;
4414
4415 mutex_lock(&mdsc->mutex);
4416 for (i = 0; i < mdsc->max_sessions; i++) {
4417 struct ceph_mds_session *s = __ceph_lookup_mds_session(mdsc, i);
4418 if (!s)
4419 continue;
4420 mutex_unlock(&mdsc->mutex);
4421 mutex_lock(&s->s_mutex);
4422 mutex_unlock(&s->s_mutex);
4423 ceph_put_mds_session(s);
4424 mutex_lock(&mdsc->mutex);
4425 }
4426 mutex_unlock(&mdsc->mutex);
4427 }
4428
4429 static void maybe_recover_session(struct ceph_mds_client *mdsc)
4430 {
4431 struct ceph_fs_client *fsc = mdsc->fsc;
4432
4433 if (!ceph_test_mount_opt(fsc, CLEANRECOVER))
4434 return;
4435
4436 if (READ_ONCE(fsc->mount_state) != CEPH_MOUNT_MOUNTED)
4437 return;
4438
4439 if (!READ_ONCE(fsc->blocklisted))
4440 return;
4441
4442 pr_info("auto reconnect after blocklisted\n");
4443 ceph_force_reconnect(fsc->sb);
4444 }
4445
4446 bool check_session_state(struct ceph_mds_session *s)
4447 {
4448 switch (s->s_state) {
4449 case CEPH_MDS_SESSION_OPEN:
4450 if (s->s_ttl && time_after(jiffies, s->s_ttl)) {
4451 s->s_state = CEPH_MDS_SESSION_HUNG;
4452 pr_info("mds%d hung\n", s->s_mds);
4453 }
4454 break;
4455 case CEPH_MDS_SESSION_CLOSING:
4456 /* Should never reach this when we're unmounting */
4457 WARN_ON_ONCE(true);
4458 fallthrough;
4459 case CEPH_MDS_SESSION_NEW:
4460 case CEPH_MDS_SESSION_RESTARTING:
4461 case CEPH_MDS_SESSION_CLOSED:
4462 case CEPH_MDS_SESSION_REJECTED:
4463 return false;
4464 }
4465
4466 return true;
4467 }
4468
4469 /*
4470 * If the sequence is incremented while we're waiting on a REQUEST_CLOSE reply,
4471 * then we need to retransmit that request.
4472 */
4473 void inc_session_sequence(struct ceph_mds_session *s)
4474 {
4475 lockdep_assert_held(&s->s_mutex);
4476
4477 s->s_seq++;
4478
4479 if (s->s_state == CEPH_MDS_SESSION_CLOSING) {
4480 int ret;
4481
4482 dout("resending session close request for mds%d\n", s->s_mds);
4483 ret = request_close_session(s);
4484 if (ret < 0)
4485 pr_err("unable to close session to mds%d: %d\n",
4486 s->s_mds, ret);
4487 }
4488 }
4489
4490 /*
4491 * delayed work -- periodically trim expired leases, renew caps with mds
4492 */
4493 static void schedule_delayed(struct ceph_mds_client *mdsc)
4494 {
4495 int delay = 5;
4496 unsigned hz = round_jiffies_relative(HZ * delay);
4497 schedule_delayed_work(&mdsc->delayed_work, hz);
4498 }
4499
4500 static void delayed_work(struct work_struct *work)
4501 {
4502 int i;
4503 struct ceph_mds_client *mdsc =
4504 container_of(work, struct ceph_mds_client, delayed_work.work);
4505 int renew_interval;
4506 int renew_caps;
4507
4508 dout("mdsc delayed_work\n");
4509
4510 if (mdsc->stopping)
4511 return;
4512
4513 mutex_lock(&mdsc->mutex);
4514 renew_interval = mdsc->mdsmap->m_session_timeout >> 2;
4515 renew_caps = time_after_eq(jiffies, HZ*renew_interval +
4516 mdsc->last_renew_caps);
4517 if (renew_caps)
4518 mdsc->last_renew_caps = jiffies;
4519
4520 for (i = 0; i < mdsc->max_sessions; i++) {
4521 struct ceph_mds_session *s = __ceph_lookup_mds_session(mdsc, i);
4522 if (!s)
4523 continue;
4524
4525 if (!check_session_state(s)) {
4526 ceph_put_mds_session(s);
4527 continue;
4528 }
4529 mutex_unlock(&mdsc->mutex);
4530
4531 mutex_lock(&s->s_mutex);
4532 if (renew_caps)
4533 send_renew_caps(mdsc, s);
4534 else
4535 ceph_con_keepalive(&s->s_con);
4536 if (s->s_state == CEPH_MDS_SESSION_OPEN ||
4537 s->s_state == CEPH_MDS_SESSION_HUNG)
4538 ceph_send_cap_releases(mdsc, s);
4539 mutex_unlock(&s->s_mutex);
4540 ceph_put_mds_session(s);
4541
4542 mutex_lock(&mdsc->mutex);
4543 }
4544 mutex_unlock(&mdsc->mutex);
4545
4546 ceph_check_delayed_caps(mdsc);
4547
4548 ceph_queue_cap_reclaim_work(mdsc);
4549
4550 ceph_trim_snapid_map(mdsc);
4551
4552 maybe_recover_session(mdsc);
4553
4554 schedule_delayed(mdsc);
4555 }
4556
4557 int ceph_mdsc_init(struct ceph_fs_client *fsc)
4558
4559 {
4560 struct ceph_mds_client *mdsc;
4561 int err;
4562
4563 mdsc = kzalloc(sizeof(struct ceph_mds_client), GFP_NOFS);
4564 if (!mdsc)
4565 return -ENOMEM;
4566 mdsc->fsc = fsc;
4567 mutex_init(&mdsc->mutex);
4568 mdsc->mdsmap = kzalloc(sizeof(*mdsc->mdsmap), GFP_NOFS);
4569 if (!mdsc->mdsmap) {
4570 err = -ENOMEM;
4571 goto err_mdsc;
4572 }
4573
4574 init_completion(&mdsc->safe_umount_waiters);
4575 init_waitqueue_head(&mdsc->session_close_wq);
4576 INIT_LIST_HEAD(&mdsc->waiting_for_map);
4577 mdsc->sessions = NULL;
4578 atomic_set(&mdsc->num_sessions, 0);
4579 mdsc->max_sessions = 0;
4580 mdsc->stopping = 0;
4581 atomic64_set(&mdsc->quotarealms_count, 0);
4582 mdsc->quotarealms_inodes = RB_ROOT;
4583 mutex_init(&mdsc->quotarealms_inodes_mutex);
4584 mdsc->last_snap_seq = 0;
4585 init_rwsem(&mdsc->snap_rwsem);
4586 mdsc->snap_realms = RB_ROOT;
4587 INIT_LIST_HEAD(&mdsc->snap_empty);
4588 mdsc->num_snap_realms = 0;
4589 spin_lock_init(&mdsc->snap_empty_lock);
4590 mdsc->last_tid = 0;
4591 mdsc->oldest_tid = 0;
4592 mdsc->request_tree = RB_ROOT;
4593 INIT_DELAYED_WORK(&mdsc->delayed_work, delayed_work);
4594 mdsc->last_renew_caps = jiffies;
4595 INIT_LIST_HEAD(&mdsc->cap_delay_list);
4596 INIT_LIST_HEAD(&mdsc->cap_wait_list);
4597 spin_lock_init(&mdsc->cap_delay_lock);
4598 INIT_LIST_HEAD(&mdsc->snap_flush_list);
4599 spin_lock_init(&mdsc->snap_flush_lock);
4600 mdsc->last_cap_flush_tid = 1;
4601 INIT_LIST_HEAD(&mdsc->cap_flush_list);
4602 INIT_LIST_HEAD(&mdsc->cap_dirty_migrating);
4603 mdsc->num_cap_flushing = 0;
4604 spin_lock_init(&mdsc->cap_dirty_lock);
4605 init_waitqueue_head(&mdsc->cap_flushing_wq);
4606 INIT_WORK(&mdsc->cap_reclaim_work, ceph_cap_reclaim_work);
4607 atomic_set(&mdsc->cap_reclaim_pending, 0);
4608 err = ceph_metric_init(&mdsc->metric);
4609 if (err)
4610 goto err_mdsmap;
4611
4612 spin_lock_init(&mdsc->dentry_list_lock);
4613 INIT_LIST_HEAD(&mdsc->dentry_leases);
4614 INIT_LIST_HEAD(&mdsc->dentry_dir_leases);
4615
4616 ceph_caps_init(mdsc);
4617 ceph_adjust_caps_max_min(mdsc, fsc->mount_options);
4618
4619 spin_lock_init(&mdsc->snapid_map_lock);
4620 mdsc->snapid_map_tree = RB_ROOT;
4621 INIT_LIST_HEAD(&mdsc->snapid_map_lru);
4622
4623 init_rwsem(&mdsc->pool_perm_rwsem);
4624 mdsc->pool_perm_tree = RB_ROOT;
4625
4626 strscpy(mdsc->nodename, utsname()->nodename,
4627 sizeof(mdsc->nodename));
4628
4629 fsc->mdsc = mdsc;
4630 return 0;
4631
4632 err_mdsmap:
4633 kfree(mdsc->mdsmap);
4634 err_mdsc:
4635 kfree(mdsc);
4636 return err;
4637 }
4638
4639 /*
4640 * Wait for safe replies on open mds requests. If we time out, drop
4641 * all requests from the tree to avoid dangling dentry refs.
4642 */
4643 static void wait_requests(struct ceph_mds_client *mdsc)
4644 {
4645 struct ceph_options *opts = mdsc->fsc->client->options;
4646 struct ceph_mds_request *req;
4647
4648 mutex_lock(&mdsc->mutex);
4649 if (__get_oldest_req(mdsc)) {
4650 mutex_unlock(&mdsc->mutex);
4651
4652 dout("wait_requests waiting for requests\n");
4653 wait_for_completion_timeout(&mdsc->safe_umount_waiters,
4654 ceph_timeout_jiffies(opts->mount_timeout));
4655
4656 /* tear down remaining requests */
4657 mutex_lock(&mdsc->mutex);
4658 while ((req = __get_oldest_req(mdsc))) {
4659 dout("wait_requests timed out on tid %llu\n",
4660 req->r_tid);
4661 list_del_init(&req->r_wait);
4662 __unregister_request(mdsc, req);
4663 }
4664 }
4665 mutex_unlock(&mdsc->mutex);
4666 dout("wait_requests done\n");
4667 }
4668
4669 /*
4670 * called before mount is ro, and before dentries are torn down.
4671 * (hmm, does this still race with new lookups?)
4672 */
4673 void ceph_mdsc_pre_umount(struct ceph_mds_client *mdsc)
4674 {
4675 dout("pre_umount\n");
4676 mdsc->stopping = 1;
4677
4678 lock_unlock_sessions(mdsc);
4679 ceph_flush_dirty_caps(mdsc);
4680 wait_requests(mdsc);
4681
4682 /*
4683 * wait for reply handlers to drop their request refs and
4684 * their inode/dcache refs
4685 */
4686 ceph_msgr_flush();
4687
4688 ceph_cleanup_quotarealms_inodes(mdsc);
4689 }
4690
4691 /*
4692 * wait for all write mds requests to flush.
4693 */
4694 static void wait_unsafe_requests(struct ceph_mds_client *mdsc, u64 want_tid)
4695 {
4696 struct ceph_mds_request *req = NULL, *nextreq;
4697 struct rb_node *n;
4698
4699 mutex_lock(&mdsc->mutex);
4700 dout("wait_unsafe_requests want %lld\n", want_tid);
4701 restart:
4702 req = __get_oldest_req(mdsc);
4703 while (req && req->r_tid <= want_tid) {
4704 /* find next request */
4705 n = rb_next(&req->r_node);
4706 if (n)
4707 nextreq = rb_entry(n, struct ceph_mds_request, r_node);
4708 else
4709 nextreq = NULL;
4710 if (req->r_op != CEPH_MDS_OP_SETFILELOCK &&
4711 (req->r_op & CEPH_MDS_OP_WRITE)) {
4712 /* write op */
4713 ceph_mdsc_get_request(req);
4714 if (nextreq)
4715 ceph_mdsc_get_request(nextreq);
4716 mutex_unlock(&mdsc->mutex);
4717 dout("wait_unsafe_requests wait on %llu (want %llu)\n",
4718 req->r_tid, want_tid);
4719 wait_for_completion(&req->r_safe_completion);
4720 mutex_lock(&mdsc->mutex);
4721 ceph_mdsc_put_request(req);
4722 if (!nextreq)
4723 break; /* next dne before, so we're done! */
4724 if (RB_EMPTY_NODE(&nextreq->r_node)) {
4725 /* next request was removed from tree */
4726 ceph_mdsc_put_request(nextreq);
4727 goto restart;
4728 }
4729 ceph_mdsc_put_request(nextreq); /* won't go away */
4730 }
4731 req = nextreq;
4732 }
4733 mutex_unlock(&mdsc->mutex);
4734 dout("wait_unsafe_requests done\n");
4735 }
4736
4737 void ceph_mdsc_sync(struct ceph_mds_client *mdsc)
4738 {
4739 u64 want_tid, want_flush;
4740
4741 if (READ_ONCE(mdsc->fsc->mount_state) >= CEPH_MOUNT_SHUTDOWN)
4742 return;
4743
4744 dout("sync\n");
4745 mutex_lock(&mdsc->mutex);
4746 want_tid = mdsc->last_tid;
4747 mutex_unlock(&mdsc->mutex);
4748
4749 ceph_flush_dirty_caps(mdsc);
4750 spin_lock(&mdsc->cap_dirty_lock);
4751 want_flush = mdsc->last_cap_flush_tid;
4752 if (!list_empty(&mdsc->cap_flush_list)) {
4753 struct ceph_cap_flush *cf =
4754 list_last_entry(&mdsc->cap_flush_list,
4755 struct ceph_cap_flush, g_list);
4756 cf->wake = true;
4757 }
4758 spin_unlock(&mdsc->cap_dirty_lock);
4759
4760 dout("sync want tid %lld flush_seq %lld\n",
4761 want_tid, want_flush);
4762
4763 wait_unsafe_requests(mdsc, want_tid);
4764 wait_caps_flush(mdsc, want_flush);
4765 }
4766
4767 /*
4768 * true if all sessions are closed, or we force unmount
4769 */
4770 static bool done_closing_sessions(struct ceph_mds_client *mdsc, int skipped)
4771 {
4772 if (READ_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_SHUTDOWN)
4773 return true;
4774 return atomic_read(&mdsc->num_sessions) <= skipped;
4775 }
4776
4777 /*
4778 * called after sb is ro.
4779 */
4780 void ceph_mdsc_close_sessions(struct ceph_mds_client *mdsc)
4781 {
4782 struct ceph_options *opts = mdsc->fsc->client->options;
4783 struct ceph_mds_session *session;
4784 int i;
4785 int skipped = 0;
4786
4787 dout("close_sessions\n");
4788
4789 /* close sessions */
4790 mutex_lock(&mdsc->mutex);
4791 for (i = 0; i < mdsc->max_sessions; i++) {
4792 session = __ceph_lookup_mds_session(mdsc, i);
4793 if (!session)
4794 continue;
4795 mutex_unlock(&mdsc->mutex);
4796 mutex_lock(&session->s_mutex);
4797 if (__close_session(mdsc, session) <= 0)
4798 skipped++;
4799 mutex_unlock(&session->s_mutex);
4800 ceph_put_mds_session(session);
4801 mutex_lock(&mdsc->mutex);
4802 }
4803 mutex_unlock(&mdsc->mutex);
4804
4805 dout("waiting for sessions to close\n");
4806 wait_event_timeout(mdsc->session_close_wq,
4807 done_closing_sessions(mdsc, skipped),
4808 ceph_timeout_jiffies(opts->mount_timeout));
4809
4810 /* tear down remaining sessions */
4811 mutex_lock(&mdsc->mutex);
4812 for (i = 0; i < mdsc->max_sessions; i++) {
4813 if (mdsc->sessions[i]) {
4814 session = ceph_get_mds_session(mdsc->sessions[i]);
4815 __unregister_session(mdsc, session);
4816 mutex_unlock(&mdsc->mutex);
4817 mutex_lock(&session->s_mutex);
4818 remove_session_caps(session);
4819 mutex_unlock(&session->s_mutex);
4820 ceph_put_mds_session(session);
4821 mutex_lock(&mdsc->mutex);
4822 }
4823 }
4824 WARN_ON(!list_empty(&mdsc->cap_delay_list));
4825 mutex_unlock(&mdsc->mutex);
4826
4827 ceph_cleanup_snapid_map(mdsc);
4828 ceph_cleanup_empty_realms(mdsc);
4829
4830 cancel_work_sync(&mdsc->cap_reclaim_work);
4831 cancel_delayed_work_sync(&mdsc->delayed_work); /* cancel timer */
4832
4833 dout("stopped\n");
4834 }
4835
4836 void ceph_mdsc_force_umount(struct ceph_mds_client *mdsc)
4837 {
4838 struct ceph_mds_session *session;
4839 int mds;
4840
4841 dout("force umount\n");
4842
4843 mutex_lock(&mdsc->mutex);
4844 for (mds = 0; mds < mdsc->max_sessions; mds++) {
4845 session = __ceph_lookup_mds_session(mdsc, mds);
4846 if (!session)
4847 continue;
4848
4849 if (session->s_state == CEPH_MDS_SESSION_REJECTED)
4850 __unregister_session(mdsc, session);
4851 __wake_requests(mdsc, &session->s_waiting);
4852 mutex_unlock(&mdsc->mutex);
4853
4854 mutex_lock(&session->s_mutex);
4855 __close_session(mdsc, session);
4856 if (session->s_state == CEPH_MDS_SESSION_CLOSING) {
4857 cleanup_session_requests(mdsc, session);
4858 remove_session_caps(session);
4859 }
4860 mutex_unlock(&session->s_mutex);
4861 ceph_put_mds_session(session);
4862
4863 mutex_lock(&mdsc->mutex);
4864 kick_requests(mdsc, mds);
4865 }
4866 __wake_requests(mdsc, &mdsc->waiting_for_map);
4867 mutex_unlock(&mdsc->mutex);
4868 }
4869
4870 static void ceph_mdsc_stop(struct ceph_mds_client *mdsc)
4871 {
4872 dout("stop\n");
4873 /*
4874 * Make sure the delayed work stopped before releasing
4875 * the resources.
4876 *
4877 * Because the cancel_delayed_work_sync() will only
4878 * guarantee that the work finishes executing. But the
4879 * delayed work will re-arm itself again after that.
4880 */
4881 flush_delayed_work(&mdsc->delayed_work);
4882
4883 if (mdsc->mdsmap)
4884 ceph_mdsmap_destroy(mdsc->mdsmap);
4885 kfree(mdsc->sessions);
4886 ceph_caps_finalize(mdsc);
4887 ceph_pool_perm_destroy(mdsc);
4888 }
4889
4890 void ceph_mdsc_destroy(struct ceph_fs_client *fsc)
4891 {
4892 struct ceph_mds_client *mdsc = fsc->mdsc;
4893 dout("mdsc_destroy %p\n", mdsc);
4894
4895 if (!mdsc)
4896 return;
4897
4898 /* flush out any connection work with references to us */
4899 ceph_msgr_flush();
4900
4901 ceph_mdsc_stop(mdsc);
4902
4903 ceph_metric_destroy(&mdsc->metric);
4904
4905 flush_delayed_work(&mdsc->metric.delayed_work);
4906 fsc->mdsc = NULL;
4907 kfree(mdsc);
4908 dout("mdsc_destroy %p done\n", mdsc);
4909 }
4910
4911 void ceph_mdsc_handle_fsmap(struct ceph_mds_client *mdsc, struct ceph_msg *msg)
4912 {
4913 struct ceph_fs_client *fsc = mdsc->fsc;
4914 const char *mds_namespace = fsc->mount_options->mds_namespace;
4915 void *p = msg->front.iov_base;
4916 void *end = p + msg->front.iov_len;
4917 u32 epoch;
4918 u32 num_fs;
4919 u32 mount_fscid = (u32)-1;
4920 int err = -EINVAL;
4921
4922 ceph_decode_need(&p, end, sizeof(u32), bad);
4923 epoch = ceph_decode_32(&p);
4924
4925 dout("handle_fsmap epoch %u\n", epoch);
4926
4927 /* struct_v, struct_cv, map_len, epoch, legacy_client_fscid */
4928 ceph_decode_skip_n(&p, end, 2 + sizeof(u32) * 3, bad);
4929
4930 ceph_decode_32_safe(&p, end, num_fs, bad);
4931 while (num_fs-- > 0) {
4932 void *info_p, *info_end;
4933 u32 info_len;
4934 u32 fscid, namelen;
4935
4936 ceph_decode_need(&p, end, 2 + sizeof(u32), bad);
4937 p += 2; // info_v, info_cv
4938 info_len = ceph_decode_32(&p);
4939 ceph_decode_need(&p, end, info_len, bad);
4940 info_p = p;
4941 info_end = p + info_len;
4942 p = info_end;
4943
4944 ceph_decode_need(&info_p, info_end, sizeof(u32) * 2, bad);
4945 fscid = ceph_decode_32(&info_p);
4946 namelen = ceph_decode_32(&info_p);
4947 ceph_decode_need(&info_p, info_end, namelen, bad);
4948
4949 if (mds_namespace &&
4950 strlen(mds_namespace) == namelen &&
4951 !strncmp(mds_namespace, (char *)info_p, namelen)) {
4952 mount_fscid = fscid;
4953 break;
4954 }
4955 }
4956
4957 ceph_monc_got_map(&fsc->client->monc, CEPH_SUB_FSMAP, epoch);
4958 if (mount_fscid != (u32)-1) {
4959 fsc->client->monc.fs_cluster_id = mount_fscid;
4960 ceph_monc_want_map(&fsc->client->monc, CEPH_SUB_MDSMAP,
4961 0, true);
4962 ceph_monc_renew_subs(&fsc->client->monc);
4963 } else {
4964 err = -ENOENT;
4965 goto err_out;
4966 }
4967 return;
4968
4969 bad:
4970 pr_err("error decoding fsmap\n");
4971 err_out:
4972 mutex_lock(&mdsc->mutex);
4973 mdsc->mdsmap_err = err;
4974 __wake_requests(mdsc, &mdsc->waiting_for_map);
4975 mutex_unlock(&mdsc->mutex);
4976 }
4977
4978 /*
4979 * handle mds map update.
4980 */
4981 void ceph_mdsc_handle_mdsmap(struct ceph_mds_client *mdsc, struct ceph_msg *msg)
4982 {
4983 u32 epoch;
4984 u32 maplen;
4985 void *p = msg->front.iov_base;
4986 void *end = p + msg->front.iov_len;
4987 struct ceph_mdsmap *newmap, *oldmap;
4988 struct ceph_fsid fsid;
4989 int err = -EINVAL;
4990
4991 ceph_decode_need(&p, end, sizeof(fsid)+2*sizeof(u32), bad);
4992 ceph_decode_copy(&p, &fsid, sizeof(fsid));
4993 if (ceph_check_fsid(mdsc->fsc->client, &fsid) < 0)
4994 return;
4995 epoch = ceph_decode_32(&p);
4996 maplen = ceph_decode_32(&p);
4997 dout("handle_map epoch %u len %d\n", epoch, (int)maplen);
4998
4999 /* do we need it? */
5000 mutex_lock(&mdsc->mutex);
5001 if (mdsc->mdsmap && epoch <= mdsc->mdsmap->m_epoch) {
5002 dout("handle_map epoch %u <= our %u\n",
5003 epoch, mdsc->mdsmap->m_epoch);
5004 mutex_unlock(&mdsc->mutex);
5005 return;
5006 }
5007
5008 newmap = ceph_mdsmap_decode(&p, end, ceph_msgr2(mdsc->fsc->client));
5009 if (IS_ERR(newmap)) {
5010 err = PTR_ERR(newmap);
5011 goto bad_unlock;
5012 }
5013
5014 /* swap into place */
5015 if (mdsc->mdsmap) {
5016 oldmap = mdsc->mdsmap;
5017 mdsc->mdsmap = newmap;
5018 check_new_map(mdsc, newmap, oldmap);
5019 ceph_mdsmap_destroy(oldmap);
5020 } else {
5021 mdsc->mdsmap = newmap; /* first mds map */
5022 }
5023 mdsc->fsc->max_file_size = min((loff_t)mdsc->mdsmap->m_max_file_size,
5024 MAX_LFS_FILESIZE);
5025
5026 __wake_requests(mdsc, &mdsc->waiting_for_map);
5027 ceph_monc_got_map(&mdsc->fsc->client->monc, CEPH_SUB_MDSMAP,
5028 mdsc->mdsmap->m_epoch);
5029
5030 mutex_unlock(&mdsc->mutex);
5031 schedule_delayed(mdsc);
5032 return;
5033
5034 bad_unlock:
5035 mutex_unlock(&mdsc->mutex);
5036 bad:
5037 pr_err("error decoding mdsmap %d\n", err);
5038 return;
5039 }
5040
5041 static struct ceph_connection *con_get(struct ceph_connection *con)
5042 {
5043 struct ceph_mds_session *s = con->private;
5044
5045 if (ceph_get_mds_session(s))
5046 return con;
5047 return NULL;
5048 }
5049
5050 static void con_put(struct ceph_connection *con)
5051 {
5052 struct ceph_mds_session *s = con->private;
5053
5054 ceph_put_mds_session(s);
5055 }
5056
5057 /*
5058 * if the client is unresponsive for long enough, the mds will kill
5059 * the session entirely.
5060 */
5061 static void peer_reset(struct ceph_connection *con)
5062 {
5063 struct ceph_mds_session *s = con->private;
5064 struct ceph_mds_client *mdsc = s->s_mdsc;
5065
5066 pr_warn("mds%d closed our session\n", s->s_mds);
5067 send_mds_reconnect(mdsc, s);
5068 }
5069
5070 static void dispatch(struct ceph_connection *con, struct ceph_msg *msg)
5071 {
5072 struct ceph_mds_session *s = con->private;
5073 struct ceph_mds_client *mdsc = s->s_mdsc;
5074 int type = le16_to_cpu(msg->hdr.type);
5075
5076 mutex_lock(&mdsc->mutex);
5077 if (__verify_registered_session(mdsc, s) < 0) {
5078 mutex_unlock(&mdsc->mutex);
5079 goto out;
5080 }
5081 mutex_unlock(&mdsc->mutex);
5082
5083 switch (type) {
5084 case CEPH_MSG_MDS_MAP:
5085 ceph_mdsc_handle_mdsmap(mdsc, msg);
5086 break;
5087 case CEPH_MSG_FS_MAP_USER:
5088 ceph_mdsc_handle_fsmap(mdsc, msg);
5089 break;
5090 case CEPH_MSG_CLIENT_SESSION:
5091 handle_session(s, msg);
5092 break;
5093 case CEPH_MSG_CLIENT_REPLY:
5094 handle_reply(s, msg);
5095 break;
5096 case CEPH_MSG_CLIENT_REQUEST_FORWARD:
5097 handle_forward(mdsc, s, msg);
5098 break;
5099 case CEPH_MSG_CLIENT_CAPS:
5100 ceph_handle_caps(s, msg);
5101 break;
5102 case CEPH_MSG_CLIENT_SNAP:
5103 ceph_handle_snap(mdsc, s, msg);
5104 break;
5105 case CEPH_MSG_CLIENT_LEASE:
5106 handle_lease(mdsc, s, msg);
5107 break;
5108 case CEPH_MSG_CLIENT_QUOTA:
5109 ceph_handle_quota(mdsc, s, msg);
5110 break;
5111
5112 default:
5113 pr_err("received unknown message type %d %s\n", type,
5114 ceph_msg_type_name(type));
5115 }
5116 out:
5117 ceph_msg_put(msg);
5118 }
5119
5120 /*
5121 * authentication
5122 */
5123
5124 /*
5125 * Note: returned pointer is the address of a structure that's
5126 * managed separately. Caller must *not* attempt to free it.
5127 */
5128 static struct ceph_auth_handshake *get_authorizer(struct ceph_connection *con,
5129 int *proto, int force_new)
5130 {
5131 struct ceph_mds_session *s = con->private;
5132 struct ceph_mds_client *mdsc = s->s_mdsc;
5133 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
5134 struct ceph_auth_handshake *auth = &s->s_auth;
5135 int ret;
5136
5137 ret = __ceph_auth_get_authorizer(ac, auth, CEPH_ENTITY_TYPE_MDS,
5138 force_new, proto, NULL, NULL);
5139 if (ret)
5140 return ERR_PTR(ret);
5141
5142 return auth;
5143 }
5144
5145 static int add_authorizer_challenge(struct ceph_connection *con,
5146 void *challenge_buf, int challenge_buf_len)
5147 {
5148 struct ceph_mds_session *s = con->private;
5149 struct ceph_mds_client *mdsc = s->s_mdsc;
5150 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
5151
5152 return ceph_auth_add_authorizer_challenge(ac, s->s_auth.authorizer,
5153 challenge_buf, challenge_buf_len);
5154 }
5155
5156 static int verify_authorizer_reply(struct ceph_connection *con)
5157 {
5158 struct ceph_mds_session *s = con->private;
5159 struct ceph_mds_client *mdsc = s->s_mdsc;
5160 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
5161 struct ceph_auth_handshake *auth = &s->s_auth;
5162
5163 return ceph_auth_verify_authorizer_reply(ac, auth->authorizer,
5164 auth->authorizer_reply_buf, auth->authorizer_reply_buf_len,
5165 NULL, NULL, NULL, NULL);
5166 }
5167
5168 static int invalidate_authorizer(struct ceph_connection *con)
5169 {
5170 struct ceph_mds_session *s = con->private;
5171 struct ceph_mds_client *mdsc = s->s_mdsc;
5172 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
5173
5174 ceph_auth_invalidate_authorizer(ac, CEPH_ENTITY_TYPE_MDS);
5175
5176 return ceph_monc_validate_auth(&mdsc->fsc->client->monc);
5177 }
5178
5179 static int mds_get_auth_request(struct ceph_connection *con,
5180 void *buf, int *buf_len,
5181 void **authorizer, int *authorizer_len)
5182 {
5183 struct ceph_mds_session *s = con->private;
5184 struct ceph_auth_client *ac = s->s_mdsc->fsc->client->monc.auth;
5185 struct ceph_auth_handshake *auth = &s->s_auth;
5186 int ret;
5187
5188 ret = ceph_auth_get_authorizer(ac, auth, CEPH_ENTITY_TYPE_MDS,
5189 buf, buf_len);
5190 if (ret)
5191 return ret;
5192
5193 *authorizer = auth->authorizer_buf;
5194 *authorizer_len = auth->authorizer_buf_len;
5195 return 0;
5196 }
5197
5198 static int mds_handle_auth_reply_more(struct ceph_connection *con,
5199 void *reply, int reply_len,
5200 void *buf, int *buf_len,
5201 void **authorizer, int *authorizer_len)
5202 {
5203 struct ceph_mds_session *s = con->private;
5204 struct ceph_auth_client *ac = s->s_mdsc->fsc->client->monc.auth;
5205 struct ceph_auth_handshake *auth = &s->s_auth;
5206 int ret;
5207
5208 ret = ceph_auth_handle_svc_reply_more(ac, auth, reply, reply_len,
5209 buf, buf_len);
5210 if (ret)
5211 return ret;
5212
5213 *authorizer = auth->authorizer_buf;
5214 *authorizer_len = auth->authorizer_buf_len;
5215 return 0;
5216 }
5217
5218 static int mds_handle_auth_done(struct ceph_connection *con,
5219 u64 global_id, void *reply, int reply_len,
5220 u8 *session_key, int *session_key_len,
5221 u8 *con_secret, int *con_secret_len)
5222 {
5223 struct ceph_mds_session *s = con->private;
5224 struct ceph_auth_client *ac = s->s_mdsc->fsc->client->monc.auth;
5225 struct ceph_auth_handshake *auth = &s->s_auth;
5226
5227 return ceph_auth_handle_svc_reply_done(ac, auth, reply, reply_len,
5228 session_key, session_key_len,
5229 con_secret, con_secret_len);
5230 }
5231
5232 static int mds_handle_auth_bad_method(struct ceph_connection *con,
5233 int used_proto, int result,
5234 const int *allowed_protos, int proto_cnt,
5235 const int *allowed_modes, int mode_cnt)
5236 {
5237 struct ceph_mds_session *s = con->private;
5238 struct ceph_mon_client *monc = &s->s_mdsc->fsc->client->monc;
5239 int ret;
5240
5241 if (ceph_auth_handle_bad_authorizer(monc->auth, CEPH_ENTITY_TYPE_MDS,
5242 used_proto, result,
5243 allowed_protos, proto_cnt,
5244 allowed_modes, mode_cnt)) {
5245 ret = ceph_monc_validate_auth(monc);
5246 if (ret)
5247 return ret;
5248 }
5249
5250 return -EACCES;
5251 }
5252
5253 static struct ceph_msg *mds_alloc_msg(struct ceph_connection *con,
5254 struct ceph_msg_header *hdr, int *skip)
5255 {
5256 struct ceph_msg *msg;
5257 int type = (int) le16_to_cpu(hdr->type);
5258 int front_len = (int) le32_to_cpu(hdr->front_len);
5259
5260 if (con->in_msg)
5261 return con->in_msg;
5262
5263 *skip = 0;
5264 msg = ceph_msg_new(type, front_len, GFP_NOFS, false);
5265 if (!msg) {
5266 pr_err("unable to allocate msg type %d len %d\n",
5267 type, front_len);
5268 return NULL;
5269 }
5270
5271 return msg;
5272 }
5273
5274 static int mds_sign_message(struct ceph_msg *msg)
5275 {
5276 struct ceph_mds_session *s = msg->con->private;
5277 struct ceph_auth_handshake *auth = &s->s_auth;
5278
5279 return ceph_auth_sign_message(auth, msg);
5280 }
5281
5282 static int mds_check_message_signature(struct ceph_msg *msg)
5283 {
5284 struct ceph_mds_session *s = msg->con->private;
5285 struct ceph_auth_handshake *auth = &s->s_auth;
5286
5287 return ceph_auth_check_message_signature(auth, msg);
5288 }
5289
5290 static const struct ceph_connection_operations mds_con_ops = {
5291 .get = con_get,
5292 .put = con_put,
5293 .dispatch = dispatch,
5294 .get_authorizer = get_authorizer,
5295 .add_authorizer_challenge = add_authorizer_challenge,
5296 .verify_authorizer_reply = verify_authorizer_reply,
5297 .invalidate_authorizer = invalidate_authorizer,
5298 .peer_reset = peer_reset,
5299 .alloc_msg = mds_alloc_msg,
5300 .sign_message = mds_sign_message,
5301 .check_message_signature = mds_check_message_signature,
5302 .get_auth_request = mds_get_auth_request,
5303 .handle_auth_reply_more = mds_handle_auth_reply_more,
5304 .handle_auth_done = mds_handle_auth_done,
5305 .handle_auth_bad_method = mds_handle_auth_bad_method,
5306 };
5307
5308 /* eof */
Linux with added FPC-III support