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Merge tag 'pm-6.16-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm
[linux-2.6-block.git] / fs / ceph / mds_client.c
... / ...
CommitLineData
1// SPDX-License-Identifier: GPL-2.0
2#include <linux/ceph/ceph_debug.h>
3
4#include <linux/fs.h>
5#include <linux/wait.h>
6#include <linux/slab.h>
7#include <linux/gfp.h>
8#include <linux/sched.h>
9#include <linux/debugfs.h>
10#include <linux/seq_file.h>
11#include <linux/ratelimit.h>
12#include <linux/bits.h>
13#include <linux/ktime.h>
14#include <linux/bitmap.h>
15#include <linux/mnt_idmapping.h>
16
17#include "super.h"
18#include "mds_client.h"
19#include "crypto.h"
20
21#include <linux/ceph/ceph_features.h>
22#include <linux/ceph/messenger.h>
23#include <linux/ceph/decode.h>
24#include <linux/ceph/pagelist.h>
25#include <linux/ceph/auth.h>
26#include <linux/ceph/debugfs.h>
27
28#define RECONNECT_MAX_SIZE (INT_MAX - PAGE_SIZE)
29
30/*
31 * A cluster of MDS (metadata server) daemons is responsible for
32 * managing the file system namespace (the directory hierarchy and
33 * inodes) and for coordinating shared access to storage. Metadata is
34 * partitioning hierarchically across a number of servers, and that
35 * partition varies over time as the cluster adjusts the distribution
36 * in order to balance load.
37 *
38 * The MDS client is primarily responsible to managing synchronous
39 * metadata requests for operations like open, unlink, and so forth.
40 * If there is a MDS failure, we find out about it when we (possibly
41 * request and) receive a new MDS map, and can resubmit affected
42 * requests.
43 *
44 * For the most part, though, we take advantage of a lossless
45 * communications channel to the MDS, and do not need to worry about
46 * timing out or resubmitting requests.
47 *
48 * We maintain a stateful "session" with each MDS we interact with.
49 * Within each session, we sent periodic heartbeat messages to ensure
50 * any capabilities or leases we have been issues remain valid. If
51 * the session times out and goes stale, our leases and capabilities
52 * are no longer valid.
53 */
54
55struct ceph_reconnect_state {
56 struct ceph_mds_session *session;
57 int nr_caps, nr_realms;
58 struct ceph_pagelist *pagelist;
59 unsigned msg_version;
60 bool allow_multi;
61};
62
63static void __wake_requests(struct ceph_mds_client *mdsc,
64 struct list_head *head);
65static void ceph_cap_release_work(struct work_struct *work);
66static void ceph_cap_reclaim_work(struct work_struct *work);
67
68static const struct ceph_connection_operations mds_con_ops;
69
70
71/*
72 * mds reply parsing
73 */
74
75static int parse_reply_info_quota(void **p, void *end,
76 struct ceph_mds_reply_info_in *info)
77{
78 u8 struct_v, struct_compat;
79 u32 struct_len;
80
81 ceph_decode_8_safe(p, end, struct_v, bad);
82 ceph_decode_8_safe(p, end, struct_compat, bad);
83 /* struct_v is expected to be >= 1. we only
84 * understand encoding with struct_compat == 1. */
85 if (!struct_v || struct_compat != 1)
86 goto bad;
87 ceph_decode_32_safe(p, end, struct_len, bad);
88 ceph_decode_need(p, end, struct_len, bad);
89 end = *p + struct_len;
90 ceph_decode_64_safe(p, end, info->max_bytes, bad);
91 ceph_decode_64_safe(p, end, info->max_files, bad);
92 *p = end;
93 return 0;
94bad:
95 return -EIO;
96}
97
98/*
99 * parse individual inode info
100 */
101static int parse_reply_info_in(void **p, void *end,
102 struct ceph_mds_reply_info_in *info,
103 u64 features)
104{
105 int err = 0;
106 u8 struct_v = 0;
107
108 if (features == (u64)-1) {
109 u32 struct_len;
110 u8 struct_compat;
111 ceph_decode_8_safe(p, end, struct_v, bad);
112 ceph_decode_8_safe(p, end, struct_compat, bad);
113 /* struct_v is expected to be >= 1. we only understand
114 * encoding with struct_compat == 1. */
115 if (!struct_v || struct_compat != 1)
116 goto bad;
117 ceph_decode_32_safe(p, end, struct_len, bad);
118 ceph_decode_need(p, end, struct_len, bad);
119 end = *p + struct_len;
120 }
121
122 ceph_decode_need(p, end, sizeof(struct ceph_mds_reply_inode), bad);
123 info->in = *p;
124 *p += sizeof(struct ceph_mds_reply_inode) +
125 sizeof(*info->in->fragtree.splits) *
126 le32_to_cpu(info->in->fragtree.nsplits);
127
128 ceph_decode_32_safe(p, end, info->symlink_len, bad);
129 ceph_decode_need(p, end, info->symlink_len, bad);
130 info->symlink = *p;
131 *p += info->symlink_len;
132
133 ceph_decode_copy_safe(p, end, &info->dir_layout,
134 sizeof(info->dir_layout), bad);
135 ceph_decode_32_safe(p, end, info->xattr_len, bad);
136 ceph_decode_need(p, end, info->xattr_len, bad);
137 info->xattr_data = *p;
138 *p += info->xattr_len;
139
140 if (features == (u64)-1) {
141 /* inline data */
142 ceph_decode_64_safe(p, end, info->inline_version, bad);
143 ceph_decode_32_safe(p, end, info->inline_len, bad);
144 ceph_decode_need(p, end, info->inline_len, bad);
145 info->inline_data = *p;
146 *p += info->inline_len;
147 /* quota */
148 err = parse_reply_info_quota(p, end, info);
149 if (err < 0)
150 goto out_bad;
151 /* pool namespace */
152 ceph_decode_32_safe(p, end, info->pool_ns_len, bad);
153 if (info->pool_ns_len > 0) {
154 ceph_decode_need(p, end, info->pool_ns_len, bad);
155 info->pool_ns_data = *p;
156 *p += info->pool_ns_len;
157 }
158
159 /* btime */
160 ceph_decode_need(p, end, sizeof(info->btime), bad);
161 ceph_decode_copy(p, &info->btime, sizeof(info->btime));
162
163 /* change attribute */
164 ceph_decode_64_safe(p, end, info->change_attr, bad);
165
166 /* dir pin */
167 if (struct_v >= 2) {
168 ceph_decode_32_safe(p, end, info->dir_pin, bad);
169 } else {
170 info->dir_pin = -ENODATA;
171 }
172
173 /* snapshot birth time, remains zero for v<=2 */
174 if (struct_v >= 3) {
175 ceph_decode_need(p, end, sizeof(info->snap_btime), bad);
176 ceph_decode_copy(p, &info->snap_btime,
177 sizeof(info->snap_btime));
178 } else {
179 memset(&info->snap_btime, 0, sizeof(info->snap_btime));
180 }
181
182 /* snapshot count, remains zero for v<=3 */
183 if (struct_v >= 4) {
184 ceph_decode_64_safe(p, end, info->rsnaps, bad);
185 } else {
186 info->rsnaps = 0;
187 }
188
189 if (struct_v >= 5) {
190 u32 alen;
191
192 ceph_decode_32_safe(p, end, alen, bad);
193
194 while (alen--) {
195 u32 len;
196
197 /* key */
198 ceph_decode_32_safe(p, end, len, bad);
199 ceph_decode_skip_n(p, end, len, bad);
200 /* value */
201 ceph_decode_32_safe(p, end, len, bad);
202 ceph_decode_skip_n(p, end, len, bad);
203 }
204 }
205
206 /* fscrypt flag -- ignore */
207 if (struct_v >= 6)
208 ceph_decode_skip_8(p, end, bad);
209
210 info->fscrypt_auth = NULL;
211 info->fscrypt_auth_len = 0;
212 info->fscrypt_file = NULL;
213 info->fscrypt_file_len = 0;
214 if (struct_v >= 7) {
215 ceph_decode_32_safe(p, end, info->fscrypt_auth_len, bad);
216 if (info->fscrypt_auth_len) {
217 info->fscrypt_auth = kmalloc(info->fscrypt_auth_len,
218 GFP_KERNEL);
219 if (!info->fscrypt_auth)
220 return -ENOMEM;
221 ceph_decode_copy_safe(p, end, info->fscrypt_auth,
222 info->fscrypt_auth_len, bad);
223 }
224 ceph_decode_32_safe(p, end, info->fscrypt_file_len, bad);
225 if (info->fscrypt_file_len) {
226 info->fscrypt_file = kmalloc(info->fscrypt_file_len,
227 GFP_KERNEL);
228 if (!info->fscrypt_file)
229 return -ENOMEM;
230 ceph_decode_copy_safe(p, end, info->fscrypt_file,
231 info->fscrypt_file_len, bad);
232 }
233 }
234 *p = end;
235 } else {
236 /* legacy (unversioned) struct */
237 if (features & CEPH_FEATURE_MDS_INLINE_DATA) {
238 ceph_decode_64_safe(p, end, info->inline_version, bad);
239 ceph_decode_32_safe(p, end, info->inline_len, bad);
240 ceph_decode_need(p, end, info->inline_len, bad);
241 info->inline_data = *p;
242 *p += info->inline_len;
243 } else
244 info->inline_version = CEPH_INLINE_NONE;
245
246 if (features & CEPH_FEATURE_MDS_QUOTA) {
247 err = parse_reply_info_quota(p, end, info);
248 if (err < 0)
249 goto out_bad;
250 } else {
251 info->max_bytes = 0;
252 info->max_files = 0;
253 }
254
255 info->pool_ns_len = 0;
256 info->pool_ns_data = NULL;
257 if (features & CEPH_FEATURE_FS_FILE_LAYOUT_V2) {
258 ceph_decode_32_safe(p, end, info->pool_ns_len, bad);
259 if (info->pool_ns_len > 0) {
260 ceph_decode_need(p, end, info->pool_ns_len, bad);
261 info->pool_ns_data = *p;
262 *p += info->pool_ns_len;
263 }
264 }
265
266 if (features & CEPH_FEATURE_FS_BTIME) {
267 ceph_decode_need(p, end, sizeof(info->btime), bad);
268 ceph_decode_copy(p, &info->btime, sizeof(info->btime));
269 ceph_decode_64_safe(p, end, info->change_attr, bad);
270 }
271
272 info->dir_pin = -ENODATA;
273 /* info->snap_btime and info->rsnaps remain zero */
274 }
275 return 0;
276bad:
277 err = -EIO;
278out_bad:
279 return err;
280}
281
282static int parse_reply_info_dir(void **p, void *end,
283 struct ceph_mds_reply_dirfrag **dirfrag,
284 u64 features)
285{
286 if (features == (u64)-1) {
287 u8 struct_v, struct_compat;
288 u32 struct_len;
289 ceph_decode_8_safe(p, end, struct_v, bad);
290 ceph_decode_8_safe(p, end, struct_compat, bad);
291 /* struct_v is expected to be >= 1. we only understand
292 * encoding whose struct_compat == 1. */
293 if (!struct_v || struct_compat != 1)
294 goto bad;
295 ceph_decode_32_safe(p, end, struct_len, bad);
296 ceph_decode_need(p, end, struct_len, bad);
297 end = *p + struct_len;
298 }
299
300 ceph_decode_need(p, end, sizeof(**dirfrag), bad);
301 *dirfrag = *p;
302 *p += sizeof(**dirfrag) + sizeof(u32) * le32_to_cpu((*dirfrag)->ndist);
303 if (unlikely(*p > end))
304 goto bad;
305 if (features == (u64)-1)
306 *p = end;
307 return 0;
308bad:
309 return -EIO;
310}
311
312static int parse_reply_info_lease(void **p, void *end,
313 struct ceph_mds_reply_lease **lease,
314 u64 features, u32 *altname_len, u8 **altname)
315{
316 u8 struct_v;
317 u32 struct_len;
318 void *lend;
319
320 if (features == (u64)-1) {
321 u8 struct_compat;
322
323 ceph_decode_8_safe(p, end, struct_v, bad);
324 ceph_decode_8_safe(p, end, struct_compat, bad);
325
326 /* struct_v is expected to be >= 1. we only understand
327 * encoding whose struct_compat == 1. */
328 if (!struct_v || struct_compat != 1)
329 goto bad;
330
331 ceph_decode_32_safe(p, end, struct_len, bad);
332 } else {
333 struct_len = sizeof(**lease);
334 *altname_len = 0;
335 *altname = NULL;
336 }
337
338 lend = *p + struct_len;
339 ceph_decode_need(p, end, struct_len, bad);
340 *lease = *p;
341 *p += sizeof(**lease);
342
343 if (features == (u64)-1) {
344 if (struct_v >= 2) {
345 ceph_decode_32_safe(p, end, *altname_len, bad);
346 ceph_decode_need(p, end, *altname_len, bad);
347 *altname = *p;
348 *p += *altname_len;
349 } else {
350 *altname = NULL;
351 *altname_len = 0;
352 }
353 }
354 *p = lend;
355 return 0;
356bad:
357 return -EIO;
358}
359
360/*
361 * parse a normal reply, which may contain a (dir+)dentry and/or a
362 * target inode.
363 */
364static int parse_reply_info_trace(void **p, void *end,
365 struct ceph_mds_reply_info_parsed *info,
366 u64 features)
367{
368 int err;
369
370 if (info->head->is_dentry) {
371 err = parse_reply_info_in(p, end, &info->diri, features);
372 if (err < 0)
373 goto out_bad;
374
375 err = parse_reply_info_dir(p, end, &info->dirfrag, features);
376 if (err < 0)
377 goto out_bad;
378
379 ceph_decode_32_safe(p, end, info->dname_len, bad);
380 ceph_decode_need(p, end, info->dname_len, bad);
381 info->dname = *p;
382 *p += info->dname_len;
383
384 err = parse_reply_info_lease(p, end, &info->dlease, features,
385 &info->altname_len, &info->altname);
386 if (err < 0)
387 goto out_bad;
388 }
389
390 if (info->head->is_target) {
391 err = parse_reply_info_in(p, end, &info->targeti, features);
392 if (err < 0)
393 goto out_bad;
394 }
395
396 if (unlikely(*p != end))
397 goto bad;
398 return 0;
399
400bad:
401 err = -EIO;
402out_bad:
403 pr_err("problem parsing mds trace %d\n", err);
404 return err;
405}
406
407/*
408 * parse readdir results
409 */
410static int parse_reply_info_readdir(void **p, void *end,
411 struct ceph_mds_request *req,
412 u64 features)
413{
414 struct ceph_mds_reply_info_parsed *info = &req->r_reply_info;
415 struct ceph_client *cl = req->r_mdsc->fsc->client;
416 u32 num, i = 0;
417 int err;
418
419 err = parse_reply_info_dir(p, end, &info->dir_dir, features);
420 if (err < 0)
421 goto out_bad;
422
423 ceph_decode_need(p, end, sizeof(num) + 2, bad);
424 num = ceph_decode_32(p);
425 {
426 u16 flags = ceph_decode_16(p);
427 info->dir_end = !!(flags & CEPH_READDIR_FRAG_END);
428 info->dir_complete = !!(flags & CEPH_READDIR_FRAG_COMPLETE);
429 info->hash_order = !!(flags & CEPH_READDIR_HASH_ORDER);
430 info->offset_hash = !!(flags & CEPH_READDIR_OFFSET_HASH);
431 }
432 if (num == 0)
433 goto done;
434
435 BUG_ON(!info->dir_entries);
436 if ((unsigned long)(info->dir_entries + num) >
437 (unsigned long)info->dir_entries + info->dir_buf_size) {
438 pr_err_client(cl, "dir contents are larger than expected\n");
439 WARN_ON(1);
440 goto bad;
441 }
442
443 info->dir_nr = num;
444 while (num) {
445 struct inode *inode = d_inode(req->r_dentry);
446 struct ceph_inode_info *ci = ceph_inode(inode);
447 struct ceph_mds_reply_dir_entry *rde = info->dir_entries + i;
448 struct fscrypt_str tname = FSTR_INIT(NULL, 0);
449 struct fscrypt_str oname = FSTR_INIT(NULL, 0);
450 struct ceph_fname fname;
451 u32 altname_len, _name_len;
452 u8 *altname, *_name;
453
454 /* dentry */
455 ceph_decode_32_safe(p, end, _name_len, bad);
456 ceph_decode_need(p, end, _name_len, bad);
457 _name = *p;
458 *p += _name_len;
459 doutc(cl, "parsed dir dname '%.*s'\n", _name_len, _name);
460
461 if (info->hash_order)
462 rde->raw_hash = ceph_str_hash(ci->i_dir_layout.dl_dir_hash,
463 _name, _name_len);
464
465 /* dentry lease */
466 err = parse_reply_info_lease(p, end, &rde->lease, features,
467 &altname_len, &altname);
468 if (err)
469 goto out_bad;
470
471 /*
472 * Try to dencrypt the dentry names and update them
473 * in the ceph_mds_reply_dir_entry struct.
474 */
475 fname.dir = inode;
476 fname.name = _name;
477 fname.name_len = _name_len;
478 fname.ctext = altname;
479 fname.ctext_len = altname_len;
480 /*
481 * The _name_len maybe larger than altname_len, such as
482 * when the human readable name length is in range of
483 * (CEPH_NOHASH_NAME_MAX, CEPH_NOHASH_NAME_MAX + SHA256_DIGEST_SIZE),
484 * then the copy in ceph_fname_to_usr will corrupt the
485 * data if there has no encryption key.
486 *
487 * Just set the no_copy flag and then if there has no
488 * encryption key the oname.name will be assigned to
489 * _name always.
490 */
491 fname.no_copy = true;
492 if (altname_len == 0) {
493 /*
494 * Set tname to _name, and this will be used
495 * to do the base64_decode in-place. It's
496 * safe because the decoded string should
497 * always be shorter, which is 3/4 of origin
498 * string.
499 */
500 tname.name = _name;
501
502 /*
503 * Set oname to _name too, and this will be
504 * used to do the dencryption in-place.
505 */
506 oname.name = _name;
507 oname.len = _name_len;
508 } else {
509 /*
510 * This will do the decryption only in-place
511 * from altname cryptext directly.
512 */
513 oname.name = altname;
514 oname.len = altname_len;
515 }
516 rde->is_nokey = false;
517 err = ceph_fname_to_usr(&fname, &tname, &oname, &rde->is_nokey);
518 if (err) {
519 pr_err_client(cl, "unable to decode %.*s, got %d\n",
520 _name_len, _name, err);
521 goto out_bad;
522 }
523 rde->name = oname.name;
524 rde->name_len = oname.len;
525
526 /* inode */
527 err = parse_reply_info_in(p, end, &rde->inode, features);
528 if (err < 0)
529 goto out_bad;
530 /* ceph_readdir_prepopulate() will update it */
531 rde->offset = 0;
532 i++;
533 num--;
534 }
535
536done:
537 /* Skip over any unrecognized fields */
538 *p = end;
539 return 0;
540
541bad:
542 err = -EIO;
543out_bad:
544 pr_err_client(cl, "problem parsing dir contents %d\n", err);
545 return err;
546}
547
548/*
549 * parse fcntl F_GETLK results
550 */
551static int parse_reply_info_filelock(void **p, void *end,
552 struct ceph_mds_reply_info_parsed *info,
553 u64 features)
554{
555 if (*p + sizeof(*info->filelock_reply) > end)
556 goto bad;
557
558 info->filelock_reply = *p;
559
560 /* Skip over any unrecognized fields */
561 *p = end;
562 return 0;
563bad:
564 return -EIO;
565}
566
567
568#if BITS_PER_LONG == 64
569
570#define DELEGATED_INO_AVAILABLE xa_mk_value(1)
571
572static int ceph_parse_deleg_inos(void **p, void *end,
573 struct ceph_mds_session *s)
574{
575 struct ceph_client *cl = s->s_mdsc->fsc->client;
576 u32 sets;
577
578 ceph_decode_32_safe(p, end, sets, bad);
579 doutc(cl, "got %u sets of delegated inodes\n", sets);
580 while (sets--) {
581 u64 start, len;
582
583 ceph_decode_64_safe(p, end, start, bad);
584 ceph_decode_64_safe(p, end, len, bad);
585
586 /* Don't accept a delegation of system inodes */
587 if (start < CEPH_INO_SYSTEM_BASE) {
588 pr_warn_ratelimited_client(cl,
589 "ignoring reserved inode range delegation (start=0x%llx len=0x%llx)\n",
590 start, len);
591 continue;
592 }
593 while (len--) {
594 int err = xa_insert(&s->s_delegated_inos, start++,
595 DELEGATED_INO_AVAILABLE,
596 GFP_KERNEL);
597 if (!err) {
598 doutc(cl, "added delegated inode 0x%llx\n", start - 1);
599 } else if (err == -EBUSY) {
600 pr_warn_client(cl,
601 "MDS delegated inode 0x%llx more than once.\n",
602 start - 1);
603 } else {
604 return err;
605 }
606 }
607 }
608 return 0;
609bad:
610 return -EIO;
611}
612
613u64 ceph_get_deleg_ino(struct ceph_mds_session *s)
614{
615 unsigned long ino;
616 void *val;
617
618 xa_for_each(&s->s_delegated_inos, ino, val) {
619 val = xa_erase(&s->s_delegated_inos, ino);
620 if (val == DELEGATED_INO_AVAILABLE)
621 return ino;
622 }
623 return 0;
624}
625
626int ceph_restore_deleg_ino(struct ceph_mds_session *s, u64 ino)
627{
628 return xa_insert(&s->s_delegated_inos, ino, DELEGATED_INO_AVAILABLE,
629 GFP_KERNEL);
630}
631#else /* BITS_PER_LONG == 64 */
632/*
633 * FIXME: xarrays can't handle 64-bit indexes on a 32-bit arch. For now, just
634 * ignore delegated_inos on 32 bit arch. Maybe eventually add xarrays for top
635 * and bottom words?
636 */
637static int ceph_parse_deleg_inos(void **p, void *end,
638 struct ceph_mds_session *s)
639{
640 u32 sets;
641
642 ceph_decode_32_safe(p, end, sets, bad);
643 if (sets)
644 ceph_decode_skip_n(p, end, sets * 2 * sizeof(__le64), bad);
645 return 0;
646bad:
647 return -EIO;
648}
649
650u64 ceph_get_deleg_ino(struct ceph_mds_session *s)
651{
652 return 0;
653}
654
655int ceph_restore_deleg_ino(struct ceph_mds_session *s, u64 ino)
656{
657 return 0;
658}
659#endif /* BITS_PER_LONG == 64 */
660
661/*
662 * parse create results
663 */
664static int parse_reply_info_create(void **p, void *end,
665 struct ceph_mds_reply_info_parsed *info,
666 u64 features, struct ceph_mds_session *s)
667{
668 int ret;
669
670 if (features == (u64)-1 ||
671 (features & CEPH_FEATURE_REPLY_CREATE_INODE)) {
672 if (*p == end) {
673 /* Malformed reply? */
674 info->has_create_ino = false;
675 } else if (test_bit(CEPHFS_FEATURE_DELEG_INO, &s->s_features)) {
676 info->has_create_ino = true;
677 /* struct_v, struct_compat, and len */
678 ceph_decode_skip_n(p, end, 2 + sizeof(u32), bad);
679 ceph_decode_64_safe(p, end, info->ino, bad);
680 ret = ceph_parse_deleg_inos(p, end, s);
681 if (ret)
682 return ret;
683 } else {
684 /* legacy */
685 ceph_decode_64_safe(p, end, info->ino, bad);
686 info->has_create_ino = true;
687 }
688 } else {
689 if (*p != end)
690 goto bad;
691 }
692
693 /* Skip over any unrecognized fields */
694 *p = end;
695 return 0;
696bad:
697 return -EIO;
698}
699
700static int parse_reply_info_getvxattr(void **p, void *end,
701 struct ceph_mds_reply_info_parsed *info,
702 u64 features)
703{
704 u32 value_len;
705
706 ceph_decode_skip_8(p, end, bad); /* skip current version: 1 */
707 ceph_decode_skip_8(p, end, bad); /* skip first version: 1 */
708 ceph_decode_skip_32(p, end, bad); /* skip payload length */
709
710 ceph_decode_32_safe(p, end, value_len, bad);
711
712 if (value_len == end - *p) {
713 info->xattr_info.xattr_value = *p;
714 info->xattr_info.xattr_value_len = value_len;
715 *p = end;
716 return value_len;
717 }
718bad:
719 return -EIO;
720}
721
722/*
723 * parse extra results
724 */
725static int parse_reply_info_extra(void **p, void *end,
726 struct ceph_mds_request *req,
727 u64 features, struct ceph_mds_session *s)
728{
729 struct ceph_mds_reply_info_parsed *info = &req->r_reply_info;
730 u32 op = le32_to_cpu(info->head->op);
731
732 if (op == CEPH_MDS_OP_GETFILELOCK)
733 return parse_reply_info_filelock(p, end, info, features);
734 else if (op == CEPH_MDS_OP_READDIR || op == CEPH_MDS_OP_LSSNAP)
735 return parse_reply_info_readdir(p, end, req, features);
736 else if (op == CEPH_MDS_OP_CREATE)
737 return parse_reply_info_create(p, end, info, features, s);
738 else if (op == CEPH_MDS_OP_GETVXATTR)
739 return parse_reply_info_getvxattr(p, end, info, features);
740 else
741 return -EIO;
742}
743
744/*
745 * parse entire mds reply
746 */
747static int parse_reply_info(struct ceph_mds_session *s, struct ceph_msg *msg,
748 struct ceph_mds_request *req, u64 features)
749{
750 struct ceph_mds_reply_info_parsed *info = &req->r_reply_info;
751 struct ceph_client *cl = s->s_mdsc->fsc->client;
752 void *p, *end;
753 u32 len;
754 int err;
755
756 info->head = msg->front.iov_base;
757 p = msg->front.iov_base + sizeof(struct ceph_mds_reply_head);
758 end = p + msg->front.iov_len - sizeof(struct ceph_mds_reply_head);
759
760 /* trace */
761 ceph_decode_32_safe(&p, end, len, bad);
762 if (len > 0) {
763 ceph_decode_need(&p, end, len, bad);
764 err = parse_reply_info_trace(&p, p+len, info, features);
765 if (err < 0)
766 goto out_bad;
767 }
768
769 /* extra */
770 ceph_decode_32_safe(&p, end, len, bad);
771 if (len > 0) {
772 ceph_decode_need(&p, end, len, bad);
773 err = parse_reply_info_extra(&p, p+len, req, features, s);
774 if (err < 0)
775 goto out_bad;
776 }
777
778 /* snap blob */
779 ceph_decode_32_safe(&p, end, len, bad);
780 info->snapblob_len = len;
781 info->snapblob = p;
782 p += len;
783
784 if (p != end)
785 goto bad;
786 return 0;
787
788bad:
789 err = -EIO;
790out_bad:
791 pr_err_client(cl, "mds parse_reply err %d\n", err);
792 ceph_msg_dump(msg);
793 return err;
794}
795
796static void destroy_reply_info(struct ceph_mds_reply_info_parsed *info)
797{
798 int i;
799
800 kfree(info->diri.fscrypt_auth);
801 kfree(info->diri.fscrypt_file);
802 kfree(info->targeti.fscrypt_auth);
803 kfree(info->targeti.fscrypt_file);
804 if (!info->dir_entries)
805 return;
806
807 for (i = 0; i < info->dir_nr; i++) {
808 struct ceph_mds_reply_dir_entry *rde = info->dir_entries + i;
809
810 kfree(rde->inode.fscrypt_auth);
811 kfree(rde->inode.fscrypt_file);
812 }
813 free_pages((unsigned long)info->dir_entries, get_order(info->dir_buf_size));
814}
815
816/*
817 * In async unlink case the kclient won't wait for the first reply
818 * from MDS and just drop all the links and unhash the dentry and then
819 * succeeds immediately.
820 *
821 * For any new create/link/rename,etc requests followed by using the
822 * same file names we must wait for the first reply of the inflight
823 * unlink request, or the MDS possibly will fail these following
824 * requests with -EEXIST if the inflight async unlink request was
825 * delayed for some reasons.
826 *
827 * And the worst case is that for the none async openc request it will
828 * successfully open the file if the CDentry hasn't been unlinked yet,
829 * but later the previous delayed async unlink request will remove the
830 * CDentry. That means the just created file is possibly deleted later
831 * by accident.
832 *
833 * We need to wait for the inflight async unlink requests to finish
834 * when creating new files/directories by using the same file names.
835 */
836int ceph_wait_on_conflict_unlink(struct dentry *dentry)
837{
838 struct ceph_fs_client *fsc = ceph_sb_to_fs_client(dentry->d_sb);
839 struct ceph_client *cl = fsc->client;
840 struct dentry *pdentry = dentry->d_parent;
841 struct dentry *udentry, *found = NULL;
842 struct ceph_dentry_info *di;
843 struct qstr dname;
844 u32 hash = dentry->d_name.hash;
845 int err;
846
847 dname.name = dentry->d_name.name;
848 dname.len = dentry->d_name.len;
849
850 rcu_read_lock();
851 hash_for_each_possible_rcu(fsc->async_unlink_conflict, di,
852 hnode, hash) {
853 udentry = di->dentry;
854
855 spin_lock(&udentry->d_lock);
856 if (udentry->d_name.hash != hash)
857 goto next;
858 if (unlikely(udentry->d_parent != pdentry))
859 goto next;
860 if (!hash_hashed(&di->hnode))
861 goto next;
862
863 if (!test_bit(CEPH_DENTRY_ASYNC_UNLINK_BIT, &di->flags))
864 pr_warn_client(cl, "dentry %p:%pd async unlink bit is not set\n",
865 dentry, dentry);
866
867 if (!d_same_name(udentry, pdentry, &dname))
868 goto next;
869
870 found = dget_dlock(udentry);
871 spin_unlock(&udentry->d_lock);
872 break;
873next:
874 spin_unlock(&udentry->d_lock);
875 }
876 rcu_read_unlock();
877
878 if (likely(!found))
879 return 0;
880
881 doutc(cl, "dentry %p:%pd conflict with old %p:%pd\n", dentry, dentry,
882 found, found);
883
884 err = wait_on_bit(&di->flags, CEPH_DENTRY_ASYNC_UNLINK_BIT,
885 TASK_KILLABLE);
886 dput(found);
887 return err;
888}
889
890
891/*
892 * sessions
893 */
894const char *ceph_session_state_name(int s)
895{
896 switch (s) {
897 case CEPH_MDS_SESSION_NEW: return "new";
898 case CEPH_MDS_SESSION_OPENING: return "opening";
899 case CEPH_MDS_SESSION_OPEN: return "open";
900 case CEPH_MDS_SESSION_HUNG: return "hung";
901 case CEPH_MDS_SESSION_CLOSING: return "closing";
902 case CEPH_MDS_SESSION_CLOSED: return "closed";
903 case CEPH_MDS_SESSION_RESTARTING: return "restarting";
904 case CEPH_MDS_SESSION_RECONNECTING: return "reconnecting";
905 case CEPH_MDS_SESSION_REJECTED: return "rejected";
906 default: return "???";
907 }
908}
909
910struct ceph_mds_session *ceph_get_mds_session(struct ceph_mds_session *s)
911{
912 if (refcount_inc_not_zero(&s->s_ref))
913 return s;
914 return NULL;
915}
916
917void ceph_put_mds_session(struct ceph_mds_session *s)
918{
919 if (IS_ERR_OR_NULL(s))
920 return;
921
922 if (refcount_dec_and_test(&s->s_ref)) {
923 if (s->s_auth.authorizer)
924 ceph_auth_destroy_authorizer(s->s_auth.authorizer);
925 WARN_ON(mutex_is_locked(&s->s_mutex));
926 xa_destroy(&s->s_delegated_inos);
927 kfree(s);
928 }
929}
930
931/*
932 * called under mdsc->mutex
933 */
934struct ceph_mds_session *__ceph_lookup_mds_session(struct ceph_mds_client *mdsc,
935 int mds)
936{
937 if (mds >= mdsc->max_sessions || !mdsc->sessions[mds])
938 return NULL;
939 return ceph_get_mds_session(mdsc->sessions[mds]);
940}
941
942static bool __have_session(struct ceph_mds_client *mdsc, int mds)
943{
944 if (mds >= mdsc->max_sessions || !mdsc->sessions[mds])
945 return false;
946 else
947 return true;
948}
949
950static int __verify_registered_session(struct ceph_mds_client *mdsc,
951 struct ceph_mds_session *s)
952{
953 if (s->s_mds >= mdsc->max_sessions ||
954 mdsc->sessions[s->s_mds] != s)
955 return -ENOENT;
956 return 0;
957}
958
959/*
960 * create+register a new session for given mds.
961 * called under mdsc->mutex.
962 */
963static struct ceph_mds_session *register_session(struct ceph_mds_client *mdsc,
964 int mds)
965{
966 struct ceph_client *cl = mdsc->fsc->client;
967 struct ceph_mds_session *s;
968
969 if (READ_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_FENCE_IO)
970 return ERR_PTR(-EIO);
971
972 if (mds >= mdsc->mdsmap->possible_max_rank)
973 return ERR_PTR(-EINVAL);
974
975 s = kzalloc(sizeof(*s), GFP_NOFS);
976 if (!s)
977 return ERR_PTR(-ENOMEM);
978
979 if (mds >= mdsc->max_sessions) {
980 int newmax = 1 << get_count_order(mds + 1);
981 struct ceph_mds_session **sa;
982
983 doutc(cl, "realloc to %d\n", newmax);
984 sa = kcalloc(newmax, sizeof(void *), GFP_NOFS);
985 if (!sa)
986 goto fail_realloc;
987 if (mdsc->sessions) {
988 memcpy(sa, mdsc->sessions,
989 mdsc->max_sessions * sizeof(void *));
990 kfree(mdsc->sessions);
991 }
992 mdsc->sessions = sa;
993 mdsc->max_sessions = newmax;
994 }
995
996 doutc(cl, "mds%d\n", mds);
997 s->s_mdsc = mdsc;
998 s->s_mds = mds;
999 s->s_state = CEPH_MDS_SESSION_NEW;
1000 mutex_init(&s->s_mutex);
1001
1002 ceph_con_init(&s->s_con, s, &mds_con_ops, &mdsc->fsc->client->msgr);
1003
1004 atomic_set(&s->s_cap_gen, 1);
1005 s->s_cap_ttl = jiffies - 1;
1006
1007 spin_lock_init(&s->s_cap_lock);
1008 INIT_LIST_HEAD(&s->s_caps);
1009 refcount_set(&s->s_ref, 1);
1010 INIT_LIST_HEAD(&s->s_waiting);
1011 INIT_LIST_HEAD(&s->s_unsafe);
1012 xa_init(&s->s_delegated_inos);
1013 INIT_LIST_HEAD(&s->s_cap_releases);
1014 INIT_WORK(&s->s_cap_release_work, ceph_cap_release_work);
1015
1016 INIT_LIST_HEAD(&s->s_cap_dirty);
1017 INIT_LIST_HEAD(&s->s_cap_flushing);
1018
1019 mdsc->sessions[mds] = s;
1020 atomic_inc(&mdsc->num_sessions);
1021 refcount_inc(&s->s_ref); /* one ref to sessions[], one to caller */
1022
1023 ceph_con_open(&s->s_con, CEPH_ENTITY_TYPE_MDS, mds,
1024 ceph_mdsmap_get_addr(mdsc->mdsmap, mds));
1025
1026 return s;
1027
1028fail_realloc:
1029 kfree(s);
1030 return ERR_PTR(-ENOMEM);
1031}
1032
1033/*
1034 * called under mdsc->mutex
1035 */
1036static void __unregister_session(struct ceph_mds_client *mdsc,
1037 struct ceph_mds_session *s)
1038{
1039 doutc(mdsc->fsc->client, "mds%d %p\n", s->s_mds, s);
1040 BUG_ON(mdsc->sessions[s->s_mds] != s);
1041 mdsc->sessions[s->s_mds] = NULL;
1042 ceph_con_close(&s->s_con);
1043 ceph_put_mds_session(s);
1044 atomic_dec(&mdsc->num_sessions);
1045}
1046
1047/*
1048 * drop session refs in request.
1049 *
1050 * should be last request ref, or hold mdsc->mutex
1051 */
1052static void put_request_session(struct ceph_mds_request *req)
1053{
1054 if (req->r_session) {
1055 ceph_put_mds_session(req->r_session);
1056 req->r_session = NULL;
1057 }
1058}
1059
1060void ceph_mdsc_iterate_sessions(struct ceph_mds_client *mdsc,
1061 void (*cb)(struct ceph_mds_session *),
1062 bool check_state)
1063{
1064 int mds;
1065
1066 mutex_lock(&mdsc->mutex);
1067 for (mds = 0; mds < mdsc->max_sessions; ++mds) {
1068 struct ceph_mds_session *s;
1069
1070 s = __ceph_lookup_mds_session(mdsc, mds);
1071 if (!s)
1072 continue;
1073
1074 if (check_state && !check_session_state(s)) {
1075 ceph_put_mds_session(s);
1076 continue;
1077 }
1078
1079 mutex_unlock(&mdsc->mutex);
1080 cb(s);
1081 ceph_put_mds_session(s);
1082 mutex_lock(&mdsc->mutex);
1083 }
1084 mutex_unlock(&mdsc->mutex);
1085}
1086
1087void ceph_mdsc_release_request(struct kref *kref)
1088{
1089 struct ceph_mds_request *req = container_of(kref,
1090 struct ceph_mds_request,
1091 r_kref);
1092 ceph_mdsc_release_dir_caps_async(req);
1093 destroy_reply_info(&req->r_reply_info);
1094 if (req->r_request)
1095 ceph_msg_put(req->r_request);
1096 if (req->r_reply)
1097 ceph_msg_put(req->r_reply);
1098 if (req->r_inode) {
1099 ceph_put_cap_refs(ceph_inode(req->r_inode), CEPH_CAP_PIN);
1100 iput(req->r_inode);
1101 }
1102 if (req->r_parent) {
1103 ceph_put_cap_refs(ceph_inode(req->r_parent), CEPH_CAP_PIN);
1104 iput(req->r_parent);
1105 }
1106 iput(req->r_target_inode);
1107 iput(req->r_new_inode);
1108 if (req->r_dentry)
1109 dput(req->r_dentry);
1110 if (req->r_old_dentry)
1111 dput(req->r_old_dentry);
1112 if (req->r_old_dentry_dir) {
1113 /*
1114 * track (and drop pins for) r_old_dentry_dir
1115 * separately, since r_old_dentry's d_parent may have
1116 * changed between the dir mutex being dropped and
1117 * this request being freed.
1118 */
1119 ceph_put_cap_refs(ceph_inode(req->r_old_dentry_dir),
1120 CEPH_CAP_PIN);
1121 iput(req->r_old_dentry_dir);
1122 }
1123 kfree(req->r_path1);
1124 kfree(req->r_path2);
1125 put_cred(req->r_cred);
1126 if (req->r_mnt_idmap)
1127 mnt_idmap_put(req->r_mnt_idmap);
1128 if (req->r_pagelist)
1129 ceph_pagelist_release(req->r_pagelist);
1130 kfree(req->r_fscrypt_auth);
1131 kfree(req->r_altname);
1132 put_request_session(req);
1133 ceph_unreserve_caps(req->r_mdsc, &req->r_caps_reservation);
1134 WARN_ON_ONCE(!list_empty(&req->r_wait));
1135 kmem_cache_free(ceph_mds_request_cachep, req);
1136}
1137
1138DEFINE_RB_FUNCS(request, struct ceph_mds_request, r_tid, r_node)
1139
1140/*
1141 * lookup session, bump ref if found.
1142 *
1143 * called under mdsc->mutex.
1144 */
1145static struct ceph_mds_request *
1146lookup_get_request(struct ceph_mds_client *mdsc, u64 tid)
1147{
1148 struct ceph_mds_request *req;
1149
1150 req = lookup_request(&mdsc->request_tree, tid);
1151 if (req)
1152 ceph_mdsc_get_request(req);
1153
1154 return req;
1155}
1156
1157/*
1158 * Register an in-flight request, and assign a tid. Link to directory
1159 * are modifying (if any).
1160 *
1161 * Called under mdsc->mutex.
1162 */
1163static void __register_request(struct ceph_mds_client *mdsc,
1164 struct ceph_mds_request *req,
1165 struct inode *dir)
1166{
1167 struct ceph_client *cl = mdsc->fsc->client;
1168 int ret = 0;
1169
1170 req->r_tid = ++mdsc->last_tid;
1171 if (req->r_num_caps) {
1172 ret = ceph_reserve_caps(mdsc, &req->r_caps_reservation,
1173 req->r_num_caps);
1174 if (ret < 0) {
1175 pr_err_client(cl, "%p failed to reserve caps: %d\n",
1176 req, ret);
1177 /* set req->r_err to fail early from __do_request */
1178 req->r_err = ret;
1179 return;
1180 }
1181 }
1182 doutc(cl, "%p tid %lld\n", req, req->r_tid);
1183 ceph_mdsc_get_request(req);
1184 insert_request(&mdsc->request_tree, req);
1185
1186 req->r_cred = get_current_cred();
1187 if (!req->r_mnt_idmap)
1188 req->r_mnt_idmap = &nop_mnt_idmap;
1189
1190 if (mdsc->oldest_tid == 0 && req->r_op != CEPH_MDS_OP_SETFILELOCK)
1191 mdsc->oldest_tid = req->r_tid;
1192
1193 if (dir) {
1194 struct ceph_inode_info *ci = ceph_inode(dir);
1195
1196 ihold(dir);
1197 req->r_unsafe_dir = dir;
1198 spin_lock(&ci->i_unsafe_lock);
1199 list_add_tail(&req->r_unsafe_dir_item, &ci->i_unsafe_dirops);
1200 spin_unlock(&ci->i_unsafe_lock);
1201 }
1202}
1203
1204static void __unregister_request(struct ceph_mds_client *mdsc,
1205 struct ceph_mds_request *req)
1206{
1207 doutc(mdsc->fsc->client, "%p tid %lld\n", req, req->r_tid);
1208
1209 /* Never leave an unregistered request on an unsafe list! */
1210 list_del_init(&req->r_unsafe_item);
1211
1212 if (req->r_tid == mdsc->oldest_tid) {
1213 struct rb_node *p = rb_next(&req->r_node);
1214 mdsc->oldest_tid = 0;
1215 while (p) {
1216 struct ceph_mds_request *next_req =
1217 rb_entry(p, struct ceph_mds_request, r_node);
1218 if (next_req->r_op != CEPH_MDS_OP_SETFILELOCK) {
1219 mdsc->oldest_tid = next_req->r_tid;
1220 break;
1221 }
1222 p = rb_next(p);
1223 }
1224 }
1225
1226 erase_request(&mdsc->request_tree, req);
1227
1228 if (req->r_unsafe_dir) {
1229 struct ceph_inode_info *ci = ceph_inode(req->r_unsafe_dir);
1230 spin_lock(&ci->i_unsafe_lock);
1231 list_del_init(&req->r_unsafe_dir_item);
1232 spin_unlock(&ci->i_unsafe_lock);
1233 }
1234 if (req->r_target_inode &&
1235 test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) {
1236 struct ceph_inode_info *ci = ceph_inode(req->r_target_inode);
1237 spin_lock(&ci->i_unsafe_lock);
1238 list_del_init(&req->r_unsafe_target_item);
1239 spin_unlock(&ci->i_unsafe_lock);
1240 }
1241
1242 if (req->r_unsafe_dir) {
1243 iput(req->r_unsafe_dir);
1244 req->r_unsafe_dir = NULL;
1245 }
1246
1247 complete_all(&req->r_safe_completion);
1248
1249 ceph_mdsc_put_request(req);
1250}
1251
1252/*
1253 * Walk back up the dentry tree until we hit a dentry representing a
1254 * non-snapshot inode. We do this using the rcu_read_lock (which must be held
1255 * when calling this) to ensure that the objects won't disappear while we're
1256 * working with them. Once we hit a candidate dentry, we attempt to take a
1257 * reference to it, and return that as the result.
1258 */
1259static struct inode *get_nonsnap_parent(struct dentry *dentry)
1260{
1261 struct inode *inode = NULL;
1262
1263 while (dentry && !IS_ROOT(dentry)) {
1264 inode = d_inode_rcu(dentry);
1265 if (!inode || ceph_snap(inode) == CEPH_NOSNAP)
1266 break;
1267 dentry = dentry->d_parent;
1268 }
1269 if (inode)
1270 inode = igrab(inode);
1271 return inode;
1272}
1273
1274/*
1275 * Choose mds to send request to next. If there is a hint set in the
1276 * request (e.g., due to a prior forward hint from the mds), use that.
1277 * Otherwise, consult frag tree and/or caps to identify the
1278 * appropriate mds. If all else fails, choose randomly.
1279 *
1280 * Called under mdsc->mutex.
1281 */
1282static int __choose_mds(struct ceph_mds_client *mdsc,
1283 struct ceph_mds_request *req,
1284 bool *random)
1285{
1286 struct inode *inode;
1287 struct ceph_inode_info *ci;
1288 struct ceph_cap *cap;
1289 int mode = req->r_direct_mode;
1290 int mds = -1;
1291 u32 hash = req->r_direct_hash;
1292 bool is_hash = test_bit(CEPH_MDS_R_DIRECT_IS_HASH, &req->r_req_flags);
1293 struct ceph_client *cl = mdsc->fsc->client;
1294
1295 if (random)
1296 *random = false;
1297
1298 /*
1299 * is there a specific mds we should try? ignore hint if we have
1300 * no session and the mds is not up (active or recovering).
1301 */
1302 if (req->r_resend_mds >= 0 &&
1303 (__have_session(mdsc, req->r_resend_mds) ||
1304 ceph_mdsmap_get_state(mdsc->mdsmap, req->r_resend_mds) > 0)) {
1305 doutc(cl, "using resend_mds mds%d\n", req->r_resend_mds);
1306 return req->r_resend_mds;
1307 }
1308
1309 if (mode == USE_RANDOM_MDS)
1310 goto random;
1311
1312 inode = NULL;
1313 if (req->r_inode) {
1314 if (ceph_snap(req->r_inode) != CEPH_SNAPDIR) {
1315 inode = req->r_inode;
1316 ihold(inode);
1317 } else {
1318 /* req->r_dentry is non-null for LSSNAP request */
1319 rcu_read_lock();
1320 inode = get_nonsnap_parent(req->r_dentry);
1321 rcu_read_unlock();
1322 doutc(cl, "using snapdir's parent %p %llx.%llx\n",
1323 inode, ceph_vinop(inode));
1324 }
1325 } else if (req->r_dentry) {
1326 /* ignore race with rename; old or new d_parent is okay */
1327 struct dentry *parent;
1328 struct inode *dir;
1329
1330 rcu_read_lock();
1331 parent = READ_ONCE(req->r_dentry->d_parent);
1332 dir = req->r_parent ? : d_inode_rcu(parent);
1333
1334 if (!dir || dir->i_sb != mdsc->fsc->sb) {
1335 /* not this fs or parent went negative */
1336 inode = d_inode(req->r_dentry);
1337 if (inode)
1338 ihold(inode);
1339 } else if (ceph_snap(dir) != CEPH_NOSNAP) {
1340 /* direct snapped/virtual snapdir requests
1341 * based on parent dir inode */
1342 inode = get_nonsnap_parent(parent);
1343 doutc(cl, "using nonsnap parent %p %llx.%llx\n",
1344 inode, ceph_vinop(inode));
1345 } else {
1346 /* dentry target */
1347 inode = d_inode(req->r_dentry);
1348 if (!inode || mode == USE_AUTH_MDS) {
1349 /* dir + name */
1350 inode = igrab(dir);
1351 hash = ceph_dentry_hash(dir, req->r_dentry);
1352 is_hash = true;
1353 } else {
1354 ihold(inode);
1355 }
1356 }
1357 rcu_read_unlock();
1358 }
1359
1360 if (!inode)
1361 goto random;
1362
1363 doutc(cl, "%p %llx.%llx is_hash=%d (0x%x) mode %d\n", inode,
1364 ceph_vinop(inode), (int)is_hash, hash, mode);
1365 ci = ceph_inode(inode);
1366
1367 if (is_hash && S_ISDIR(inode->i_mode)) {
1368 struct ceph_inode_frag frag;
1369 int found;
1370
1371 ceph_choose_frag(ci, hash, &frag, &found);
1372 if (found) {
1373 if (mode == USE_ANY_MDS && frag.ndist > 0) {
1374 u8 r;
1375
1376 /* choose a random replica */
1377 get_random_bytes(&r, 1);
1378 r %= frag.ndist;
1379 mds = frag.dist[r];
1380 doutc(cl, "%p %llx.%llx frag %u mds%d (%d/%d)\n",
1381 inode, ceph_vinop(inode), frag.frag,
1382 mds, (int)r, frag.ndist);
1383 if (ceph_mdsmap_get_state(mdsc->mdsmap, mds) >=
1384 CEPH_MDS_STATE_ACTIVE &&
1385 !ceph_mdsmap_is_laggy(mdsc->mdsmap, mds))
1386 goto out;
1387 }
1388
1389 /* since this file/dir wasn't known to be
1390 * replicated, then we want to look for the
1391 * authoritative mds. */
1392 if (frag.mds >= 0) {
1393 /* choose auth mds */
1394 mds = frag.mds;
1395 doutc(cl, "%p %llx.%llx frag %u mds%d (auth)\n",
1396 inode, ceph_vinop(inode), frag.frag, mds);
1397 if (ceph_mdsmap_get_state(mdsc->mdsmap, mds) >=
1398 CEPH_MDS_STATE_ACTIVE) {
1399 if (!ceph_mdsmap_is_laggy(mdsc->mdsmap,
1400 mds))
1401 goto out;
1402 }
1403 }
1404 mode = USE_AUTH_MDS;
1405 }
1406 }
1407
1408 spin_lock(&ci->i_ceph_lock);
1409 cap = NULL;
1410 if (mode == USE_AUTH_MDS)
1411 cap = ci->i_auth_cap;
1412 if (!cap && !RB_EMPTY_ROOT(&ci->i_caps))
1413 cap = rb_entry(rb_first(&ci->i_caps), struct ceph_cap, ci_node);
1414 if (!cap) {
1415 spin_unlock(&ci->i_ceph_lock);
1416 iput(inode);
1417 goto random;
1418 }
1419 mds = cap->session->s_mds;
1420 doutc(cl, "%p %llx.%llx mds%d (%scap %p)\n", inode,
1421 ceph_vinop(inode), mds,
1422 cap == ci->i_auth_cap ? "auth " : "", cap);
1423 spin_unlock(&ci->i_ceph_lock);
1424out:
1425 iput(inode);
1426 return mds;
1427
1428random:
1429 if (random)
1430 *random = true;
1431
1432 mds = ceph_mdsmap_get_random_mds(mdsc->mdsmap);
1433 doutc(cl, "chose random mds%d\n", mds);
1434 return mds;
1435}
1436
1437
1438/*
1439 * session messages
1440 */
1441struct ceph_msg *ceph_create_session_msg(u32 op, u64 seq)
1442{
1443 struct ceph_msg *msg;
1444 struct ceph_mds_session_head *h;
1445
1446 msg = ceph_msg_new(CEPH_MSG_CLIENT_SESSION, sizeof(*h), GFP_NOFS,
1447 false);
1448 if (!msg) {
1449 pr_err("ENOMEM creating session %s msg\n",
1450 ceph_session_op_name(op));
1451 return NULL;
1452 }
1453 h = msg->front.iov_base;
1454 h->op = cpu_to_le32(op);
1455 h->seq = cpu_to_le64(seq);
1456
1457 return msg;
1458}
1459
1460static const unsigned char feature_bits[] = CEPHFS_FEATURES_CLIENT_SUPPORTED;
1461#define FEATURE_BYTES(c) (DIV_ROUND_UP((size_t)feature_bits[c - 1] + 1, 64) * 8)
1462static int encode_supported_features(void **p, void *end)
1463{
1464 static const size_t count = ARRAY_SIZE(feature_bits);
1465
1466 if (count > 0) {
1467 size_t i;
1468 size_t size = FEATURE_BYTES(count);
1469 unsigned long bit;
1470
1471 if (WARN_ON_ONCE(*p + 4 + size > end))
1472 return -ERANGE;
1473
1474 ceph_encode_32(p, size);
1475 memset(*p, 0, size);
1476 for (i = 0; i < count; i++) {
1477 bit = feature_bits[i];
1478 ((unsigned char *)(*p))[bit / 8] |= BIT(bit % 8);
1479 }
1480 *p += size;
1481 } else {
1482 if (WARN_ON_ONCE(*p + 4 > end))
1483 return -ERANGE;
1484
1485 ceph_encode_32(p, 0);
1486 }
1487
1488 return 0;
1489}
1490
1491static const unsigned char metric_bits[] = CEPHFS_METRIC_SPEC_CLIENT_SUPPORTED;
1492#define METRIC_BYTES(cnt) (DIV_ROUND_UP((size_t)metric_bits[cnt - 1] + 1, 64) * 8)
1493static int encode_metric_spec(void **p, void *end)
1494{
1495 static const size_t count = ARRAY_SIZE(metric_bits);
1496
1497 /* header */
1498 if (WARN_ON_ONCE(*p + 2 > end))
1499 return -ERANGE;
1500
1501 ceph_encode_8(p, 1); /* version */
1502 ceph_encode_8(p, 1); /* compat */
1503
1504 if (count > 0) {
1505 size_t i;
1506 size_t size = METRIC_BYTES(count);
1507
1508 if (WARN_ON_ONCE(*p + 4 + 4 + size > end))
1509 return -ERANGE;
1510
1511 /* metric spec info length */
1512 ceph_encode_32(p, 4 + size);
1513
1514 /* metric spec */
1515 ceph_encode_32(p, size);
1516 memset(*p, 0, size);
1517 for (i = 0; i < count; i++)
1518 ((unsigned char *)(*p))[i / 8] |= BIT(metric_bits[i] % 8);
1519 *p += size;
1520 } else {
1521 if (WARN_ON_ONCE(*p + 4 + 4 > end))
1522 return -ERANGE;
1523
1524 /* metric spec info length */
1525 ceph_encode_32(p, 4);
1526 /* metric spec */
1527 ceph_encode_32(p, 0);
1528 }
1529
1530 return 0;
1531}
1532
1533/*
1534 * session message, specialization for CEPH_SESSION_REQUEST_OPEN
1535 * to include additional client metadata fields.
1536 */
1537static struct ceph_msg *
1538create_session_full_msg(struct ceph_mds_client *mdsc, int op, u64 seq)
1539{
1540 struct ceph_msg *msg;
1541 struct ceph_mds_session_head *h;
1542 int i;
1543 int extra_bytes = 0;
1544 int metadata_key_count = 0;
1545 struct ceph_options *opt = mdsc->fsc->client->options;
1546 struct ceph_mount_options *fsopt = mdsc->fsc->mount_options;
1547 struct ceph_client *cl = mdsc->fsc->client;
1548 size_t size, count;
1549 void *p, *end;
1550 int ret;
1551
1552 const char* metadata[][2] = {
1553 {"hostname", mdsc->nodename},
1554 {"kernel_version", init_utsname()->release},
1555 {"entity_id", opt->name ? : ""},
1556 {"root", fsopt->server_path ? : "/"},
1557 {NULL, NULL}
1558 };
1559
1560 /* Calculate serialized length of metadata */
1561 extra_bytes = 4; /* map length */
1562 for (i = 0; metadata[i][0]; ++i) {
1563 extra_bytes += 8 + strlen(metadata[i][0]) +
1564 strlen(metadata[i][1]);
1565 metadata_key_count++;
1566 }
1567
1568 /* supported feature */
1569 size = 0;
1570 count = ARRAY_SIZE(feature_bits);
1571 if (count > 0)
1572 size = FEATURE_BYTES(count);
1573 extra_bytes += 4 + size;
1574
1575 /* metric spec */
1576 size = 0;
1577 count = ARRAY_SIZE(metric_bits);
1578 if (count > 0)
1579 size = METRIC_BYTES(count);
1580 extra_bytes += 2 + 4 + 4 + size;
1581
1582 /* flags, mds auth caps and oldest_client_tid */
1583 extra_bytes += 4 + 4 + 8;
1584
1585 /* Allocate the message */
1586 msg = ceph_msg_new(CEPH_MSG_CLIENT_SESSION, sizeof(*h) + extra_bytes,
1587 GFP_NOFS, false);
1588 if (!msg) {
1589 pr_err_client(cl, "ENOMEM creating session open msg\n");
1590 return ERR_PTR(-ENOMEM);
1591 }
1592 p = msg->front.iov_base;
1593 end = p + msg->front.iov_len;
1594
1595 h = p;
1596 h->op = cpu_to_le32(op);
1597 h->seq = cpu_to_le64(seq);
1598
1599 /*
1600 * Serialize client metadata into waiting buffer space, using
1601 * the format that userspace expects for map<string, string>
1602 *
1603 * ClientSession messages with metadata are v7
1604 */
1605 msg->hdr.version = cpu_to_le16(7);
1606 msg->hdr.compat_version = cpu_to_le16(1);
1607
1608 /* The write pointer, following the session_head structure */
1609 p += sizeof(*h);
1610
1611 /* Number of entries in the map */
1612 ceph_encode_32(&p, metadata_key_count);
1613
1614 /* Two length-prefixed strings for each entry in the map */
1615 for (i = 0; metadata[i][0]; ++i) {
1616 size_t const key_len = strlen(metadata[i][0]);
1617 size_t const val_len = strlen(metadata[i][1]);
1618
1619 ceph_encode_32(&p, key_len);
1620 memcpy(p, metadata[i][0], key_len);
1621 p += key_len;
1622 ceph_encode_32(&p, val_len);
1623 memcpy(p, metadata[i][1], val_len);
1624 p += val_len;
1625 }
1626
1627 ret = encode_supported_features(&p, end);
1628 if (ret) {
1629 pr_err_client(cl, "encode_supported_features failed!\n");
1630 ceph_msg_put(msg);
1631 return ERR_PTR(ret);
1632 }
1633
1634 ret = encode_metric_spec(&p, end);
1635 if (ret) {
1636 pr_err_client(cl, "encode_metric_spec failed!\n");
1637 ceph_msg_put(msg);
1638 return ERR_PTR(ret);
1639 }
1640
1641 /* version == 5, flags */
1642 ceph_encode_32(&p, 0);
1643
1644 /* version == 6, mds auth caps */
1645 ceph_encode_32(&p, 0);
1646
1647 /* version == 7, oldest_client_tid */
1648 ceph_encode_64(&p, mdsc->oldest_tid);
1649
1650 msg->front.iov_len = p - msg->front.iov_base;
1651 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
1652
1653 return msg;
1654}
1655
1656/*
1657 * send session open request.
1658 *
1659 * called under mdsc->mutex
1660 */
1661static int __open_session(struct ceph_mds_client *mdsc,
1662 struct ceph_mds_session *session)
1663{
1664 struct ceph_msg *msg;
1665 int mstate;
1666 int mds = session->s_mds;
1667
1668 if (READ_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_FENCE_IO)
1669 return -EIO;
1670
1671 /* wait for mds to go active? */
1672 mstate = ceph_mdsmap_get_state(mdsc->mdsmap, mds);
1673 doutc(mdsc->fsc->client, "open_session to mds%d (%s)\n", mds,
1674 ceph_mds_state_name(mstate));
1675 session->s_state = CEPH_MDS_SESSION_OPENING;
1676 session->s_renew_requested = jiffies;
1677
1678 /* send connect message */
1679 msg = create_session_full_msg(mdsc, CEPH_SESSION_REQUEST_OPEN,
1680 session->s_seq);
1681 if (IS_ERR(msg))
1682 return PTR_ERR(msg);
1683 ceph_con_send(&session->s_con, msg);
1684 return 0;
1685}
1686
1687/*
1688 * open sessions for any export targets for the given mds
1689 *
1690 * called under mdsc->mutex
1691 */
1692static struct ceph_mds_session *
1693__open_export_target_session(struct ceph_mds_client *mdsc, int target)
1694{
1695 struct ceph_mds_session *session;
1696 int ret;
1697
1698 session = __ceph_lookup_mds_session(mdsc, target);
1699 if (!session) {
1700 session = register_session(mdsc, target);
1701 if (IS_ERR(session))
1702 return session;
1703 }
1704 if (session->s_state == CEPH_MDS_SESSION_NEW ||
1705 session->s_state == CEPH_MDS_SESSION_CLOSING) {
1706 ret = __open_session(mdsc, session);
1707 if (ret)
1708 return ERR_PTR(ret);
1709 }
1710
1711 return session;
1712}
1713
1714struct ceph_mds_session *
1715ceph_mdsc_open_export_target_session(struct ceph_mds_client *mdsc, int target)
1716{
1717 struct ceph_mds_session *session;
1718 struct ceph_client *cl = mdsc->fsc->client;
1719
1720 doutc(cl, "to mds%d\n", target);
1721
1722 mutex_lock(&mdsc->mutex);
1723 session = __open_export_target_session(mdsc, target);
1724 mutex_unlock(&mdsc->mutex);
1725
1726 return session;
1727}
1728
1729static void __open_export_target_sessions(struct ceph_mds_client *mdsc,
1730 struct ceph_mds_session *session)
1731{
1732 struct ceph_mds_info *mi;
1733 struct ceph_mds_session *ts;
1734 int i, mds = session->s_mds;
1735 struct ceph_client *cl = mdsc->fsc->client;
1736
1737 if (mds >= mdsc->mdsmap->possible_max_rank)
1738 return;
1739
1740 mi = &mdsc->mdsmap->m_info[mds];
1741 doutc(cl, "for mds%d (%d targets)\n", session->s_mds,
1742 mi->num_export_targets);
1743
1744 for (i = 0; i < mi->num_export_targets; i++) {
1745 ts = __open_export_target_session(mdsc, mi->export_targets[i]);
1746 ceph_put_mds_session(ts);
1747 }
1748}
1749
1750/*
1751 * session caps
1752 */
1753
1754static void detach_cap_releases(struct ceph_mds_session *session,
1755 struct list_head *target)
1756{
1757 struct ceph_client *cl = session->s_mdsc->fsc->client;
1758
1759 lockdep_assert_held(&session->s_cap_lock);
1760
1761 list_splice_init(&session->s_cap_releases, target);
1762 session->s_num_cap_releases = 0;
1763 doutc(cl, "mds%d\n", session->s_mds);
1764}
1765
1766static void dispose_cap_releases(struct ceph_mds_client *mdsc,
1767 struct list_head *dispose)
1768{
1769 while (!list_empty(dispose)) {
1770 struct ceph_cap *cap;
1771 /* zero out the in-progress message */
1772 cap = list_first_entry(dispose, struct ceph_cap, session_caps);
1773 list_del(&cap->session_caps);
1774 ceph_put_cap(mdsc, cap);
1775 }
1776}
1777
1778static void cleanup_session_requests(struct ceph_mds_client *mdsc,
1779 struct ceph_mds_session *session)
1780{
1781 struct ceph_client *cl = mdsc->fsc->client;
1782 struct ceph_mds_request *req;
1783 struct rb_node *p;
1784
1785 doutc(cl, "mds%d\n", session->s_mds);
1786 mutex_lock(&mdsc->mutex);
1787 while (!list_empty(&session->s_unsafe)) {
1788 req = list_first_entry(&session->s_unsafe,
1789 struct ceph_mds_request, r_unsafe_item);
1790 pr_warn_ratelimited_client(cl, " dropping unsafe request %llu\n",
1791 req->r_tid);
1792 if (req->r_target_inode)
1793 mapping_set_error(req->r_target_inode->i_mapping, -EIO);
1794 if (req->r_unsafe_dir)
1795 mapping_set_error(req->r_unsafe_dir->i_mapping, -EIO);
1796 __unregister_request(mdsc, req);
1797 }
1798 /* zero r_attempts, so kick_requests() will re-send requests */
1799 p = rb_first(&mdsc->request_tree);
1800 while (p) {
1801 req = rb_entry(p, struct ceph_mds_request, r_node);
1802 p = rb_next(p);
1803 if (req->r_session &&
1804 req->r_session->s_mds == session->s_mds)
1805 req->r_attempts = 0;
1806 }
1807 mutex_unlock(&mdsc->mutex);
1808}
1809
1810/*
1811 * Helper to safely iterate over all caps associated with a session, with
1812 * special care taken to handle a racing __ceph_remove_cap().
1813 *
1814 * Caller must hold session s_mutex.
1815 */
1816int ceph_iterate_session_caps(struct ceph_mds_session *session,
1817 int (*cb)(struct inode *, int mds, void *),
1818 void *arg)
1819{
1820 struct ceph_client *cl = session->s_mdsc->fsc->client;
1821 struct list_head *p;
1822 struct ceph_cap *cap;
1823 struct inode *inode, *last_inode = NULL;
1824 struct ceph_cap *old_cap = NULL;
1825 int ret;
1826
1827 doutc(cl, "%p mds%d\n", session, session->s_mds);
1828 spin_lock(&session->s_cap_lock);
1829 p = session->s_caps.next;
1830 while (p != &session->s_caps) {
1831 int mds;
1832
1833 cap = list_entry(p, struct ceph_cap, session_caps);
1834 inode = igrab(&cap->ci->netfs.inode);
1835 if (!inode) {
1836 p = p->next;
1837 continue;
1838 }
1839 session->s_cap_iterator = cap;
1840 mds = cap->mds;
1841 spin_unlock(&session->s_cap_lock);
1842
1843 if (last_inode) {
1844 iput(last_inode);
1845 last_inode = NULL;
1846 }
1847 if (old_cap) {
1848 ceph_put_cap(session->s_mdsc, old_cap);
1849 old_cap = NULL;
1850 }
1851
1852 ret = cb(inode, mds, arg);
1853 last_inode = inode;
1854
1855 spin_lock(&session->s_cap_lock);
1856 p = p->next;
1857 if (!cap->ci) {
1858 doutc(cl, "finishing cap %p removal\n", cap);
1859 BUG_ON(cap->session != session);
1860 cap->session = NULL;
1861 list_del_init(&cap->session_caps);
1862 session->s_nr_caps--;
1863 atomic64_dec(&session->s_mdsc->metric.total_caps);
1864 if (cap->queue_release)
1865 __ceph_queue_cap_release(session, cap);
1866 else
1867 old_cap = cap; /* put_cap it w/o locks held */
1868 }
1869 if (ret < 0)
1870 goto out;
1871 }
1872 ret = 0;
1873out:
1874 session->s_cap_iterator = NULL;
1875 spin_unlock(&session->s_cap_lock);
1876
1877 iput(last_inode);
1878 if (old_cap)
1879 ceph_put_cap(session->s_mdsc, old_cap);
1880
1881 return ret;
1882}
1883
1884static int remove_session_caps_cb(struct inode *inode, int mds, void *arg)
1885{
1886 struct ceph_inode_info *ci = ceph_inode(inode);
1887 struct ceph_client *cl = ceph_inode_to_client(inode);
1888 bool invalidate = false;
1889 struct ceph_cap *cap;
1890 int iputs = 0;
1891
1892 spin_lock(&ci->i_ceph_lock);
1893 cap = __get_cap_for_mds(ci, mds);
1894 if (cap) {
1895 doutc(cl, " removing cap %p, ci is %p, inode is %p\n",
1896 cap, ci, &ci->netfs.inode);
1897
1898 iputs = ceph_purge_inode_cap(inode, cap, &invalidate);
1899 }
1900 spin_unlock(&ci->i_ceph_lock);
1901
1902 if (cap)
1903 wake_up_all(&ci->i_cap_wq);
1904 if (invalidate)
1905 ceph_queue_invalidate(inode);
1906 while (iputs--)
1907 iput(inode);
1908 return 0;
1909}
1910
1911/*
1912 * caller must hold session s_mutex
1913 */
1914static void remove_session_caps(struct ceph_mds_session *session)
1915{
1916 struct ceph_fs_client *fsc = session->s_mdsc->fsc;
1917 struct super_block *sb = fsc->sb;
1918 LIST_HEAD(dispose);
1919
1920 doutc(fsc->client, "on %p\n", session);
1921 ceph_iterate_session_caps(session, remove_session_caps_cb, fsc);
1922
1923 wake_up_all(&fsc->mdsc->cap_flushing_wq);
1924
1925 spin_lock(&session->s_cap_lock);
1926 if (session->s_nr_caps > 0) {
1927 struct inode *inode;
1928 struct ceph_cap *cap, *prev = NULL;
1929 struct ceph_vino vino;
1930 /*
1931 * iterate_session_caps() skips inodes that are being
1932 * deleted, we need to wait until deletions are complete.
1933 * __wait_on_freeing_inode() is designed for the job,
1934 * but it is not exported, so use lookup inode function
1935 * to access it.
1936 */
1937 while (!list_empty(&session->s_caps)) {
1938 cap = list_entry(session->s_caps.next,
1939 struct ceph_cap, session_caps);
1940 if (cap == prev)
1941 break;
1942 prev = cap;
1943 vino = cap->ci->i_vino;
1944 spin_unlock(&session->s_cap_lock);
1945
1946 inode = ceph_find_inode(sb, vino);
1947 iput(inode);
1948
1949 spin_lock(&session->s_cap_lock);
1950 }
1951 }
1952
1953 // drop cap expires and unlock s_cap_lock
1954 detach_cap_releases(session, &dispose);
1955
1956 BUG_ON(session->s_nr_caps > 0);
1957 BUG_ON(!list_empty(&session->s_cap_flushing));
1958 spin_unlock(&session->s_cap_lock);
1959 dispose_cap_releases(session->s_mdsc, &dispose);
1960}
1961
1962enum {
1963 RECONNECT,
1964 RENEWCAPS,
1965 FORCE_RO,
1966};
1967
1968/*
1969 * wake up any threads waiting on this session's caps. if the cap is
1970 * old (didn't get renewed on the client reconnect), remove it now.
1971 *
1972 * caller must hold s_mutex.
1973 */
1974static int wake_up_session_cb(struct inode *inode, int mds, void *arg)
1975{
1976 struct ceph_inode_info *ci = ceph_inode(inode);
1977 unsigned long ev = (unsigned long)arg;
1978
1979 if (ev == RECONNECT) {
1980 spin_lock(&ci->i_ceph_lock);
1981 ci->i_wanted_max_size = 0;
1982 ci->i_requested_max_size = 0;
1983 spin_unlock(&ci->i_ceph_lock);
1984 } else if (ev == RENEWCAPS) {
1985 struct ceph_cap *cap;
1986
1987 spin_lock(&ci->i_ceph_lock);
1988 cap = __get_cap_for_mds(ci, mds);
1989 /* mds did not re-issue stale cap */
1990 if (cap && cap->cap_gen < atomic_read(&cap->session->s_cap_gen))
1991 cap->issued = cap->implemented = CEPH_CAP_PIN;
1992 spin_unlock(&ci->i_ceph_lock);
1993 } else if (ev == FORCE_RO) {
1994 }
1995 wake_up_all(&ci->i_cap_wq);
1996 return 0;
1997}
1998
1999static void wake_up_session_caps(struct ceph_mds_session *session, int ev)
2000{
2001 struct ceph_client *cl = session->s_mdsc->fsc->client;
2002
2003 doutc(cl, "session %p mds%d\n", session, session->s_mds);
2004 ceph_iterate_session_caps(session, wake_up_session_cb,
2005 (void *)(unsigned long)ev);
2006}
2007
2008/*
2009 * Send periodic message to MDS renewing all currently held caps. The
2010 * ack will reset the expiration for all caps from this session.
2011 *
2012 * caller holds s_mutex
2013 */
2014static int send_renew_caps(struct ceph_mds_client *mdsc,
2015 struct ceph_mds_session *session)
2016{
2017 struct ceph_client *cl = mdsc->fsc->client;
2018 struct ceph_msg *msg;
2019 int state;
2020
2021 if (time_after_eq(jiffies, session->s_cap_ttl) &&
2022 time_after_eq(session->s_cap_ttl, session->s_renew_requested))
2023 pr_info_client(cl, "mds%d caps stale\n", session->s_mds);
2024 session->s_renew_requested = jiffies;
2025
2026 /* do not try to renew caps until a recovering mds has reconnected
2027 * with its clients. */
2028 state = ceph_mdsmap_get_state(mdsc->mdsmap, session->s_mds);
2029 if (state < CEPH_MDS_STATE_RECONNECT) {
2030 doutc(cl, "ignoring mds%d (%s)\n", session->s_mds,
2031 ceph_mds_state_name(state));
2032 return 0;
2033 }
2034
2035 doutc(cl, "to mds%d (%s)\n", session->s_mds,
2036 ceph_mds_state_name(state));
2037 msg = create_session_full_msg(mdsc, CEPH_SESSION_REQUEST_RENEWCAPS,
2038 ++session->s_renew_seq);
2039 if (IS_ERR(msg))
2040 return PTR_ERR(msg);
2041 ceph_con_send(&session->s_con, msg);
2042 return 0;
2043}
2044
2045static int send_flushmsg_ack(struct ceph_mds_client *mdsc,
2046 struct ceph_mds_session *session, u64 seq)
2047{
2048 struct ceph_client *cl = mdsc->fsc->client;
2049 struct ceph_msg *msg;
2050
2051 doutc(cl, "to mds%d (%s)s seq %lld\n", session->s_mds,
2052 ceph_session_state_name(session->s_state), seq);
2053 msg = ceph_create_session_msg(CEPH_SESSION_FLUSHMSG_ACK, seq);
2054 if (!msg)
2055 return -ENOMEM;
2056 ceph_con_send(&session->s_con, msg);
2057 return 0;
2058}
2059
2060
2061/*
2062 * Note new cap ttl, and any transition from stale -> not stale (fresh?).
2063 *
2064 * Called under session->s_mutex
2065 */
2066static void renewed_caps(struct ceph_mds_client *mdsc,
2067 struct ceph_mds_session *session, int is_renew)
2068{
2069 struct ceph_client *cl = mdsc->fsc->client;
2070 int was_stale;
2071 int wake = 0;
2072
2073 spin_lock(&session->s_cap_lock);
2074 was_stale = is_renew && time_after_eq(jiffies, session->s_cap_ttl);
2075
2076 session->s_cap_ttl = session->s_renew_requested +
2077 mdsc->mdsmap->m_session_timeout*HZ;
2078
2079 if (was_stale) {
2080 if (time_before(jiffies, session->s_cap_ttl)) {
2081 pr_info_client(cl, "mds%d caps renewed\n",
2082 session->s_mds);
2083 wake = 1;
2084 } else {
2085 pr_info_client(cl, "mds%d caps still stale\n",
2086 session->s_mds);
2087 }
2088 }
2089 doutc(cl, "mds%d ttl now %lu, was %s, now %s\n", session->s_mds,
2090 session->s_cap_ttl, was_stale ? "stale" : "fresh",
2091 time_before(jiffies, session->s_cap_ttl) ? "stale" : "fresh");
2092 spin_unlock(&session->s_cap_lock);
2093
2094 if (wake)
2095 wake_up_session_caps(session, RENEWCAPS);
2096}
2097
2098/*
2099 * send a session close request
2100 */
2101static int request_close_session(struct ceph_mds_session *session)
2102{
2103 struct ceph_client *cl = session->s_mdsc->fsc->client;
2104 struct ceph_msg *msg;
2105
2106 doutc(cl, "mds%d state %s seq %lld\n", session->s_mds,
2107 ceph_session_state_name(session->s_state), session->s_seq);
2108 msg = ceph_create_session_msg(CEPH_SESSION_REQUEST_CLOSE,
2109 session->s_seq);
2110 if (!msg)
2111 return -ENOMEM;
2112 ceph_con_send(&session->s_con, msg);
2113 return 1;
2114}
2115
2116/*
2117 * Called with s_mutex held.
2118 */
2119static int __close_session(struct ceph_mds_client *mdsc,
2120 struct ceph_mds_session *session)
2121{
2122 if (session->s_state >= CEPH_MDS_SESSION_CLOSING)
2123 return 0;
2124 session->s_state = CEPH_MDS_SESSION_CLOSING;
2125 return request_close_session(session);
2126}
2127
2128static bool drop_negative_children(struct dentry *dentry)
2129{
2130 struct dentry *child;
2131 bool all_negative = true;
2132
2133 if (!d_is_dir(dentry))
2134 goto out;
2135
2136 spin_lock(&dentry->d_lock);
2137 hlist_for_each_entry(child, &dentry->d_children, d_sib) {
2138 if (d_really_is_positive(child)) {
2139 all_negative = false;
2140 break;
2141 }
2142 }
2143 spin_unlock(&dentry->d_lock);
2144
2145 if (all_negative)
2146 shrink_dcache_parent(dentry);
2147out:
2148 return all_negative;
2149}
2150
2151/*
2152 * Trim old(er) caps.
2153 *
2154 * Because we can't cache an inode without one or more caps, we do
2155 * this indirectly: if a cap is unused, we prune its aliases, at which
2156 * point the inode will hopefully get dropped to.
2157 *
2158 * Yes, this is a bit sloppy. Our only real goal here is to respond to
2159 * memory pressure from the MDS, though, so it needn't be perfect.
2160 */
2161static int trim_caps_cb(struct inode *inode, int mds, void *arg)
2162{
2163 struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(inode->i_sb);
2164 struct ceph_client *cl = mdsc->fsc->client;
2165 int *remaining = arg;
2166 struct ceph_inode_info *ci = ceph_inode(inode);
2167 int used, wanted, oissued, mine;
2168 struct ceph_cap *cap;
2169
2170 if (*remaining <= 0)
2171 return -1;
2172
2173 spin_lock(&ci->i_ceph_lock);
2174 cap = __get_cap_for_mds(ci, mds);
2175 if (!cap) {
2176 spin_unlock(&ci->i_ceph_lock);
2177 return 0;
2178 }
2179 mine = cap->issued | cap->implemented;
2180 used = __ceph_caps_used(ci);
2181 wanted = __ceph_caps_file_wanted(ci);
2182 oissued = __ceph_caps_issued_other(ci, cap);
2183
2184 doutc(cl, "%p %llx.%llx cap %p mine %s oissued %s used %s wanted %s\n",
2185 inode, ceph_vinop(inode), cap, ceph_cap_string(mine),
2186 ceph_cap_string(oissued), ceph_cap_string(used),
2187 ceph_cap_string(wanted));
2188 if (cap == ci->i_auth_cap) {
2189 if (ci->i_dirty_caps || ci->i_flushing_caps ||
2190 !list_empty(&ci->i_cap_snaps))
2191 goto out;
2192 if ((used | wanted) & CEPH_CAP_ANY_WR)
2193 goto out;
2194 /* Note: it's possible that i_filelock_ref becomes non-zero
2195 * after dropping auth caps. It doesn't hurt because reply
2196 * of lock mds request will re-add auth caps. */
2197 if (atomic_read(&ci->i_filelock_ref) > 0)
2198 goto out;
2199 }
2200 /* The inode has cached pages, but it's no longer used.
2201 * we can safely drop it */
2202 if (S_ISREG(inode->i_mode) &&
2203 wanted == 0 && used == CEPH_CAP_FILE_CACHE &&
2204 !(oissued & CEPH_CAP_FILE_CACHE)) {
2205 used = 0;
2206 oissued = 0;
2207 }
2208 if ((used | wanted) & ~oissued & mine)
2209 goto out; /* we need these caps */
2210
2211 if (oissued) {
2212 /* we aren't the only cap.. just remove us */
2213 ceph_remove_cap(mdsc, cap, true);
2214 (*remaining)--;
2215 } else {
2216 struct dentry *dentry;
2217 /* try dropping referring dentries */
2218 spin_unlock(&ci->i_ceph_lock);
2219 dentry = d_find_any_alias(inode);
2220 if (dentry && drop_negative_children(dentry)) {
2221 int count;
2222 dput(dentry);
2223 d_prune_aliases(inode);
2224 count = atomic_read(&inode->i_count);
2225 if (count == 1)
2226 (*remaining)--;
2227 doutc(cl, "%p %llx.%llx cap %p pruned, count now %d\n",
2228 inode, ceph_vinop(inode), cap, count);
2229 } else {
2230 dput(dentry);
2231 }
2232 return 0;
2233 }
2234
2235out:
2236 spin_unlock(&ci->i_ceph_lock);
2237 return 0;
2238}
2239
2240/*
2241 * Trim session cap count down to some max number.
2242 */
2243int ceph_trim_caps(struct ceph_mds_client *mdsc,
2244 struct ceph_mds_session *session,
2245 int max_caps)
2246{
2247 struct ceph_client *cl = mdsc->fsc->client;
2248 int trim_caps = session->s_nr_caps - max_caps;
2249
2250 doutc(cl, "mds%d start: %d / %d, trim %d\n", session->s_mds,
2251 session->s_nr_caps, max_caps, trim_caps);
2252 if (trim_caps > 0) {
2253 int remaining = trim_caps;
2254
2255 ceph_iterate_session_caps(session, trim_caps_cb, &remaining);
2256 doutc(cl, "mds%d done: %d / %d, trimmed %d\n",
2257 session->s_mds, session->s_nr_caps, max_caps,
2258 trim_caps - remaining);
2259 }
2260
2261 ceph_flush_session_cap_releases(mdsc, session);
2262 return 0;
2263}
2264
2265static int check_caps_flush(struct ceph_mds_client *mdsc,
2266 u64 want_flush_tid)
2267{
2268 struct ceph_client *cl = mdsc->fsc->client;
2269 int ret = 1;
2270
2271 spin_lock(&mdsc->cap_dirty_lock);
2272 if (!list_empty(&mdsc->cap_flush_list)) {
2273 struct ceph_cap_flush *cf =
2274 list_first_entry(&mdsc->cap_flush_list,
2275 struct ceph_cap_flush, g_list);
2276 if (cf->tid <= want_flush_tid) {
2277 doutc(cl, "still flushing tid %llu <= %llu\n",
2278 cf->tid, want_flush_tid);
2279 ret = 0;
2280 }
2281 }
2282 spin_unlock(&mdsc->cap_dirty_lock);
2283 return ret;
2284}
2285
2286/*
2287 * flush all dirty inode data to disk.
2288 *
2289 * returns true if we've flushed through want_flush_tid
2290 */
2291static void wait_caps_flush(struct ceph_mds_client *mdsc,
2292 u64 want_flush_tid)
2293{
2294 struct ceph_client *cl = mdsc->fsc->client;
2295
2296 doutc(cl, "want %llu\n", want_flush_tid);
2297
2298 wait_event(mdsc->cap_flushing_wq,
2299 check_caps_flush(mdsc, want_flush_tid));
2300
2301 doutc(cl, "ok, flushed thru %llu\n", want_flush_tid);
2302}
2303
2304/*
2305 * called under s_mutex
2306 */
2307static void ceph_send_cap_releases(struct ceph_mds_client *mdsc,
2308 struct ceph_mds_session *session)
2309{
2310 struct ceph_client *cl = mdsc->fsc->client;
2311 struct ceph_msg *msg = NULL;
2312 struct ceph_mds_cap_release *head;
2313 struct ceph_mds_cap_item *item;
2314 struct ceph_osd_client *osdc = &mdsc->fsc->client->osdc;
2315 struct ceph_cap *cap;
2316 LIST_HEAD(tmp_list);
2317 int num_cap_releases;
2318 __le32 barrier, *cap_barrier;
2319
2320 down_read(&osdc->lock);
2321 barrier = cpu_to_le32(osdc->epoch_barrier);
2322 up_read(&osdc->lock);
2323
2324 spin_lock(&session->s_cap_lock);
2325again:
2326 list_splice_init(&session->s_cap_releases, &tmp_list);
2327 num_cap_releases = session->s_num_cap_releases;
2328 session->s_num_cap_releases = 0;
2329 spin_unlock(&session->s_cap_lock);
2330
2331 while (!list_empty(&tmp_list)) {
2332 if (!msg) {
2333 msg = ceph_msg_new(CEPH_MSG_CLIENT_CAPRELEASE,
2334 PAGE_SIZE, GFP_NOFS, false);
2335 if (!msg)
2336 goto out_err;
2337 head = msg->front.iov_base;
2338 head->num = cpu_to_le32(0);
2339 msg->front.iov_len = sizeof(*head);
2340
2341 msg->hdr.version = cpu_to_le16(2);
2342 msg->hdr.compat_version = cpu_to_le16(1);
2343 }
2344
2345 cap = list_first_entry(&tmp_list, struct ceph_cap,
2346 session_caps);
2347 list_del(&cap->session_caps);
2348 num_cap_releases--;
2349
2350 head = msg->front.iov_base;
2351 put_unaligned_le32(get_unaligned_le32(&head->num) + 1,
2352 &head->num);
2353 item = msg->front.iov_base + msg->front.iov_len;
2354 item->ino = cpu_to_le64(cap->cap_ino);
2355 item->cap_id = cpu_to_le64(cap->cap_id);
2356 item->migrate_seq = cpu_to_le32(cap->mseq);
2357 item->issue_seq = cpu_to_le32(cap->issue_seq);
2358 msg->front.iov_len += sizeof(*item);
2359
2360 ceph_put_cap(mdsc, cap);
2361
2362 if (le32_to_cpu(head->num) == CEPH_CAPS_PER_RELEASE) {
2363 // Append cap_barrier field
2364 cap_barrier = msg->front.iov_base + msg->front.iov_len;
2365 *cap_barrier = barrier;
2366 msg->front.iov_len += sizeof(*cap_barrier);
2367
2368 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
2369 doutc(cl, "mds%d %p\n", session->s_mds, msg);
2370 ceph_con_send(&session->s_con, msg);
2371 msg = NULL;
2372 }
2373 }
2374
2375 BUG_ON(num_cap_releases != 0);
2376
2377 spin_lock(&session->s_cap_lock);
2378 if (!list_empty(&session->s_cap_releases))
2379 goto again;
2380 spin_unlock(&session->s_cap_lock);
2381
2382 if (msg) {
2383 // Append cap_barrier field
2384 cap_barrier = msg->front.iov_base + msg->front.iov_len;
2385 *cap_barrier = barrier;
2386 msg->front.iov_len += sizeof(*cap_barrier);
2387
2388 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
2389 doutc(cl, "mds%d %p\n", session->s_mds, msg);
2390 ceph_con_send(&session->s_con, msg);
2391 }
2392 return;
2393out_err:
2394 pr_err_client(cl, "mds%d, failed to allocate message\n",
2395 session->s_mds);
2396 spin_lock(&session->s_cap_lock);
2397 list_splice(&tmp_list, &session->s_cap_releases);
2398 session->s_num_cap_releases += num_cap_releases;
2399 spin_unlock(&session->s_cap_lock);
2400}
2401
2402static void ceph_cap_release_work(struct work_struct *work)
2403{
2404 struct ceph_mds_session *session =
2405 container_of(work, struct ceph_mds_session, s_cap_release_work);
2406
2407 mutex_lock(&session->s_mutex);
2408 if (session->s_state == CEPH_MDS_SESSION_OPEN ||
2409 session->s_state == CEPH_MDS_SESSION_HUNG)
2410 ceph_send_cap_releases(session->s_mdsc, session);
2411 mutex_unlock(&session->s_mutex);
2412 ceph_put_mds_session(session);
2413}
2414
2415void ceph_flush_session_cap_releases(struct ceph_mds_client *mdsc,
2416 struct ceph_mds_session *session)
2417{
2418 struct ceph_client *cl = mdsc->fsc->client;
2419 if (mdsc->stopping)
2420 return;
2421
2422 ceph_get_mds_session(session);
2423 if (queue_work(mdsc->fsc->cap_wq,
2424 &session->s_cap_release_work)) {
2425 doutc(cl, "cap release work queued\n");
2426 } else {
2427 ceph_put_mds_session(session);
2428 doutc(cl, "failed to queue cap release work\n");
2429 }
2430}
2431
2432/*
2433 * caller holds session->s_cap_lock
2434 */
2435void __ceph_queue_cap_release(struct ceph_mds_session *session,
2436 struct ceph_cap *cap)
2437{
2438 list_add_tail(&cap->session_caps, &session->s_cap_releases);
2439 session->s_num_cap_releases++;
2440
2441 if (!(session->s_num_cap_releases % CEPH_CAPS_PER_RELEASE))
2442 ceph_flush_session_cap_releases(session->s_mdsc, session);
2443}
2444
2445static void ceph_cap_reclaim_work(struct work_struct *work)
2446{
2447 struct ceph_mds_client *mdsc =
2448 container_of(work, struct ceph_mds_client, cap_reclaim_work);
2449 int ret = ceph_trim_dentries(mdsc);
2450 if (ret == -EAGAIN)
2451 ceph_queue_cap_reclaim_work(mdsc);
2452}
2453
2454void ceph_queue_cap_reclaim_work(struct ceph_mds_client *mdsc)
2455{
2456 struct ceph_client *cl = mdsc->fsc->client;
2457 if (mdsc->stopping)
2458 return;
2459
2460 if (queue_work(mdsc->fsc->cap_wq, &mdsc->cap_reclaim_work)) {
2461 doutc(cl, "caps reclaim work queued\n");
2462 } else {
2463 doutc(cl, "failed to queue caps release work\n");
2464 }
2465}
2466
2467void ceph_reclaim_caps_nr(struct ceph_mds_client *mdsc, int nr)
2468{
2469 int val;
2470 if (!nr)
2471 return;
2472 val = atomic_add_return(nr, &mdsc->cap_reclaim_pending);
2473 if ((val % CEPH_CAPS_PER_RELEASE) < nr) {
2474 atomic_set(&mdsc->cap_reclaim_pending, 0);
2475 ceph_queue_cap_reclaim_work(mdsc);
2476 }
2477}
2478
2479void ceph_queue_cap_unlink_work(struct ceph_mds_client *mdsc)
2480{
2481 struct ceph_client *cl = mdsc->fsc->client;
2482 if (mdsc->stopping)
2483 return;
2484
2485 if (queue_work(mdsc->fsc->cap_wq, &mdsc->cap_unlink_work)) {
2486 doutc(cl, "caps unlink work queued\n");
2487 } else {
2488 doutc(cl, "failed to queue caps unlink work\n");
2489 }
2490}
2491
2492static void ceph_cap_unlink_work(struct work_struct *work)
2493{
2494 struct ceph_mds_client *mdsc =
2495 container_of(work, struct ceph_mds_client, cap_unlink_work);
2496 struct ceph_client *cl = mdsc->fsc->client;
2497
2498 doutc(cl, "begin\n");
2499 spin_lock(&mdsc->cap_delay_lock);
2500 while (!list_empty(&mdsc->cap_unlink_delay_list)) {
2501 struct ceph_inode_info *ci;
2502 struct inode *inode;
2503
2504 ci = list_first_entry(&mdsc->cap_unlink_delay_list,
2505 struct ceph_inode_info,
2506 i_cap_delay_list);
2507 list_del_init(&ci->i_cap_delay_list);
2508
2509 inode = igrab(&ci->netfs.inode);
2510 if (inode) {
2511 spin_unlock(&mdsc->cap_delay_lock);
2512 doutc(cl, "on %p %llx.%llx\n", inode,
2513 ceph_vinop(inode));
2514 ceph_check_caps(ci, CHECK_CAPS_FLUSH);
2515 iput(inode);
2516 spin_lock(&mdsc->cap_delay_lock);
2517 }
2518 }
2519 spin_unlock(&mdsc->cap_delay_lock);
2520 doutc(cl, "done\n");
2521}
2522
2523/*
2524 * requests
2525 */
2526
2527int ceph_alloc_readdir_reply_buffer(struct ceph_mds_request *req,
2528 struct inode *dir)
2529{
2530 struct ceph_inode_info *ci = ceph_inode(dir);
2531 struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
2532 struct ceph_mount_options *opt = req->r_mdsc->fsc->mount_options;
2533 size_t size = sizeof(struct ceph_mds_reply_dir_entry);
2534 unsigned int num_entries;
2535 int order;
2536
2537 spin_lock(&ci->i_ceph_lock);
2538 num_entries = ci->i_files + ci->i_subdirs;
2539 spin_unlock(&ci->i_ceph_lock);
2540 num_entries = max(num_entries, 1U);
2541 num_entries = min(num_entries, opt->max_readdir);
2542
2543 order = get_order(size * num_entries);
2544 while (order >= 0) {
2545 rinfo->dir_entries = (void*)__get_free_pages(GFP_KERNEL |
2546 __GFP_NOWARN |
2547 __GFP_ZERO,
2548 order);
2549 if (rinfo->dir_entries)
2550 break;
2551 order--;
2552 }
2553 if (!rinfo->dir_entries)
2554 return -ENOMEM;
2555
2556 num_entries = (PAGE_SIZE << order) / size;
2557 num_entries = min(num_entries, opt->max_readdir);
2558
2559 rinfo->dir_buf_size = PAGE_SIZE << order;
2560 req->r_num_caps = num_entries + 1;
2561 req->r_args.readdir.max_entries = cpu_to_le32(num_entries);
2562 req->r_args.readdir.max_bytes = cpu_to_le32(opt->max_readdir_bytes);
2563 return 0;
2564}
2565
2566/*
2567 * Create an mds request.
2568 */
2569struct ceph_mds_request *
2570ceph_mdsc_create_request(struct ceph_mds_client *mdsc, int op, int mode)
2571{
2572 struct ceph_mds_request *req;
2573
2574 req = kmem_cache_zalloc(ceph_mds_request_cachep, GFP_NOFS);
2575 if (!req)
2576 return ERR_PTR(-ENOMEM);
2577
2578 mutex_init(&req->r_fill_mutex);
2579 req->r_mdsc = mdsc;
2580 req->r_started = jiffies;
2581 req->r_start_latency = ktime_get();
2582 req->r_resend_mds = -1;
2583 INIT_LIST_HEAD(&req->r_unsafe_dir_item);
2584 INIT_LIST_HEAD(&req->r_unsafe_target_item);
2585 req->r_fmode = -1;
2586 req->r_feature_needed = -1;
2587 kref_init(&req->r_kref);
2588 RB_CLEAR_NODE(&req->r_node);
2589 INIT_LIST_HEAD(&req->r_wait);
2590 init_completion(&req->r_completion);
2591 init_completion(&req->r_safe_completion);
2592 INIT_LIST_HEAD(&req->r_unsafe_item);
2593
2594 ktime_get_coarse_real_ts64(&req->r_stamp);
2595
2596 req->r_op = op;
2597 req->r_direct_mode = mode;
2598 return req;
2599}
2600
2601/*
2602 * return oldest (lowest) request, tid in request tree, 0 if none.
2603 *
2604 * called under mdsc->mutex.
2605 */
2606static struct ceph_mds_request *__get_oldest_req(struct ceph_mds_client *mdsc)
2607{
2608 if (RB_EMPTY_ROOT(&mdsc->request_tree))
2609 return NULL;
2610 return rb_entry(rb_first(&mdsc->request_tree),
2611 struct ceph_mds_request, r_node);
2612}
2613
2614static inline u64 __get_oldest_tid(struct ceph_mds_client *mdsc)
2615{
2616 return mdsc->oldest_tid;
2617}
2618
2619#if IS_ENABLED(CONFIG_FS_ENCRYPTION)
2620static u8 *get_fscrypt_altname(const struct ceph_mds_request *req, u32 *plen)
2621{
2622 struct inode *dir = req->r_parent;
2623 struct dentry *dentry = req->r_dentry;
2624 const struct qstr *name = req->r_dname;
2625 u8 *cryptbuf = NULL;
2626 u32 len = 0;
2627 int ret = 0;
2628
2629 /* only encode if we have parent and dentry */
2630 if (!dir || !dentry)
2631 goto success;
2632
2633 /* No-op unless this is encrypted */
2634 if (!IS_ENCRYPTED(dir))
2635 goto success;
2636
2637 ret = ceph_fscrypt_prepare_readdir(dir);
2638 if (ret < 0)
2639 return ERR_PTR(ret);
2640
2641 /* No key? Just ignore it. */
2642 if (!fscrypt_has_encryption_key(dir))
2643 goto success;
2644
2645 if (!name)
2646 name = &dentry->d_name;
2647
2648 if (!fscrypt_fname_encrypted_size(dir, name->len, NAME_MAX, &len)) {
2649 WARN_ON_ONCE(1);
2650 return ERR_PTR(-ENAMETOOLONG);
2651 }
2652
2653 /* No need to append altname if name is short enough */
2654 if (len <= CEPH_NOHASH_NAME_MAX) {
2655 len = 0;
2656 goto success;
2657 }
2658
2659 cryptbuf = kmalloc(len, GFP_KERNEL);
2660 if (!cryptbuf)
2661 return ERR_PTR(-ENOMEM);
2662
2663 ret = fscrypt_fname_encrypt(dir, name, cryptbuf, len);
2664 if (ret) {
2665 kfree(cryptbuf);
2666 return ERR_PTR(ret);
2667 }
2668success:
2669 *plen = len;
2670 return cryptbuf;
2671}
2672#else
2673static u8 *get_fscrypt_altname(const struct ceph_mds_request *req, u32 *plen)
2674{
2675 *plen = 0;
2676 return NULL;
2677}
2678#endif
2679
2680/**
2681 * ceph_mdsc_build_path - build a path string to a given dentry
2682 * @mdsc: mds client
2683 * @dentry: dentry to which path should be built
2684 * @plen: returned length of string
2685 * @pbase: returned base inode number
2686 * @for_wire: is this path going to be sent to the MDS?
2687 *
2688 * Build a string that represents the path to the dentry. This is mostly called
2689 * for two different purposes:
2690 *
2691 * 1) we need to build a path string to send to the MDS (for_wire == true)
2692 * 2) we need a path string for local presentation (e.g. debugfs)
2693 * (for_wire == false)
2694 *
2695 * The path is built in reverse, starting with the dentry. Walk back up toward
2696 * the root, building the path until the first non-snapped inode is reached
2697 * (for_wire) or the root inode is reached (!for_wire).
2698 *
2699 * Encode hidden .snap dirs as a double /, i.e.
2700 * foo/.snap/bar -> foo//bar
2701 */
2702char *ceph_mdsc_build_path(struct ceph_mds_client *mdsc, struct dentry *dentry,
2703 int *plen, u64 *pbase, int for_wire)
2704{
2705 struct ceph_client *cl = mdsc->fsc->client;
2706 struct dentry *cur;
2707 struct inode *inode;
2708 char *path;
2709 int pos;
2710 unsigned seq;
2711 u64 base;
2712
2713 if (!dentry)
2714 return ERR_PTR(-EINVAL);
2715
2716 path = __getname();
2717 if (!path)
2718 return ERR_PTR(-ENOMEM);
2719retry:
2720 pos = PATH_MAX - 1;
2721 path[pos] = '\0';
2722
2723 seq = read_seqbegin(&rename_lock);
2724 cur = dget(dentry);
2725 for (;;) {
2726 struct dentry *parent;
2727
2728 spin_lock(&cur->d_lock);
2729 inode = d_inode(cur);
2730 if (inode && ceph_snap(inode) == CEPH_SNAPDIR) {
2731 doutc(cl, "path+%d: %p SNAPDIR\n", pos, cur);
2732 spin_unlock(&cur->d_lock);
2733 parent = dget_parent(cur);
2734 } else if (for_wire && inode && dentry != cur &&
2735 ceph_snap(inode) == CEPH_NOSNAP) {
2736 spin_unlock(&cur->d_lock);
2737 pos++; /* get rid of any prepended '/' */
2738 break;
2739 } else if (!for_wire || !IS_ENCRYPTED(d_inode(cur->d_parent))) {
2740 pos -= cur->d_name.len;
2741 if (pos < 0) {
2742 spin_unlock(&cur->d_lock);
2743 break;
2744 }
2745 memcpy(path + pos, cur->d_name.name, cur->d_name.len);
2746 spin_unlock(&cur->d_lock);
2747 parent = dget_parent(cur);
2748 } else {
2749 int len, ret;
2750 char buf[NAME_MAX];
2751
2752 /*
2753 * Proactively copy name into buf, in case we need to
2754 * present it as-is.
2755 */
2756 memcpy(buf, cur->d_name.name, cur->d_name.len);
2757 len = cur->d_name.len;
2758 spin_unlock(&cur->d_lock);
2759 parent = dget_parent(cur);
2760
2761 ret = ceph_fscrypt_prepare_readdir(d_inode(parent));
2762 if (ret < 0) {
2763 dput(parent);
2764 dput(cur);
2765 return ERR_PTR(ret);
2766 }
2767
2768 if (fscrypt_has_encryption_key(d_inode(parent))) {
2769 len = ceph_encode_encrypted_fname(d_inode(parent),
2770 cur, buf);
2771 if (len < 0) {
2772 dput(parent);
2773 dput(cur);
2774 return ERR_PTR(len);
2775 }
2776 }
2777 pos -= len;
2778 if (pos < 0) {
2779 dput(parent);
2780 break;
2781 }
2782 memcpy(path + pos, buf, len);
2783 }
2784 dput(cur);
2785 cur = parent;
2786
2787 /* Are we at the root? */
2788 if (IS_ROOT(cur))
2789 break;
2790
2791 /* Are we out of buffer? */
2792 if (--pos < 0)
2793 break;
2794
2795 path[pos] = '/';
2796 }
2797 inode = d_inode(cur);
2798 base = inode ? ceph_ino(inode) : 0;
2799 dput(cur);
2800
2801 if (read_seqretry(&rename_lock, seq))
2802 goto retry;
2803
2804 if (pos < 0) {
2805 /*
2806 * The path is longer than PATH_MAX and this function
2807 * cannot ever succeed. Creating paths that long is
2808 * possible with Ceph, but Linux cannot use them.
2809 */
2810 return ERR_PTR(-ENAMETOOLONG);
2811 }
2812
2813 *pbase = base;
2814 *plen = PATH_MAX - 1 - pos;
2815 doutc(cl, "on %p %d built %llx '%.*s'\n", dentry, d_count(dentry),
2816 base, *plen, path + pos);
2817 return path + pos;
2818}
2819
2820static int build_dentry_path(struct ceph_mds_client *mdsc, struct dentry *dentry,
2821 struct inode *dir, const char **ppath, int *ppathlen,
2822 u64 *pino, bool *pfreepath, bool parent_locked)
2823{
2824 char *path;
2825
2826 rcu_read_lock();
2827 if (!dir)
2828 dir = d_inode_rcu(dentry->d_parent);
2829 if (dir && parent_locked && ceph_snap(dir) == CEPH_NOSNAP &&
2830 !IS_ENCRYPTED(dir)) {
2831 *pino = ceph_ino(dir);
2832 rcu_read_unlock();
2833 *ppath = dentry->d_name.name;
2834 *ppathlen = dentry->d_name.len;
2835 return 0;
2836 }
2837 rcu_read_unlock();
2838 path = ceph_mdsc_build_path(mdsc, dentry, ppathlen, pino, 1);
2839 if (IS_ERR(path))
2840 return PTR_ERR(path);
2841 *ppath = path;
2842 *pfreepath = true;
2843 return 0;
2844}
2845
2846static int build_inode_path(struct inode *inode,
2847 const char **ppath, int *ppathlen, u64 *pino,
2848 bool *pfreepath)
2849{
2850 struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(inode->i_sb);
2851 struct dentry *dentry;
2852 char *path;
2853
2854 if (ceph_snap(inode) == CEPH_NOSNAP) {
2855 *pino = ceph_ino(inode);
2856 *ppathlen = 0;
2857 return 0;
2858 }
2859 dentry = d_find_alias(inode);
2860 path = ceph_mdsc_build_path(mdsc, dentry, ppathlen, pino, 1);
2861 dput(dentry);
2862 if (IS_ERR(path))
2863 return PTR_ERR(path);
2864 *ppath = path;
2865 *pfreepath = true;
2866 return 0;
2867}
2868
2869/*
2870 * request arguments may be specified via an inode *, a dentry *, or
2871 * an explicit ino+path.
2872 */
2873static int set_request_path_attr(struct ceph_mds_client *mdsc, struct inode *rinode,
2874 struct dentry *rdentry, struct inode *rdiri,
2875 const char *rpath, u64 rino, const char **ppath,
2876 int *pathlen, u64 *ino, bool *freepath,
2877 bool parent_locked)
2878{
2879 struct ceph_client *cl = mdsc->fsc->client;
2880 int r = 0;
2881
2882 if (rinode) {
2883 r = build_inode_path(rinode, ppath, pathlen, ino, freepath);
2884 doutc(cl, " inode %p %llx.%llx\n", rinode, ceph_ino(rinode),
2885 ceph_snap(rinode));
2886 } else if (rdentry) {
2887 r = build_dentry_path(mdsc, rdentry, rdiri, ppath, pathlen, ino,
2888 freepath, parent_locked);
2889 doutc(cl, " dentry %p %llx/%.*s\n", rdentry, *ino, *pathlen, *ppath);
2890 } else if (rpath || rino) {
2891 *ino = rino;
2892 *ppath = rpath;
2893 *pathlen = rpath ? strlen(rpath) : 0;
2894 doutc(cl, " path %.*s\n", *pathlen, rpath);
2895 }
2896
2897 return r;
2898}
2899
2900static void encode_mclientrequest_tail(void **p,
2901 const struct ceph_mds_request *req)
2902{
2903 struct ceph_timespec ts;
2904 int i;
2905
2906 ceph_encode_timespec64(&ts, &req->r_stamp);
2907 ceph_encode_copy(p, &ts, sizeof(ts));
2908
2909 /* v4: gid_list */
2910 ceph_encode_32(p, req->r_cred->group_info->ngroups);
2911 for (i = 0; i < req->r_cred->group_info->ngroups; i++)
2912 ceph_encode_64(p, from_kgid(&init_user_ns,
2913 req->r_cred->group_info->gid[i]));
2914
2915 /* v5: altname */
2916 ceph_encode_32(p, req->r_altname_len);
2917 ceph_encode_copy(p, req->r_altname, req->r_altname_len);
2918
2919 /* v6: fscrypt_auth and fscrypt_file */
2920 if (req->r_fscrypt_auth) {
2921 u32 authlen = ceph_fscrypt_auth_len(req->r_fscrypt_auth);
2922
2923 ceph_encode_32(p, authlen);
2924 ceph_encode_copy(p, req->r_fscrypt_auth, authlen);
2925 } else {
2926 ceph_encode_32(p, 0);
2927 }
2928 if (test_bit(CEPH_MDS_R_FSCRYPT_FILE, &req->r_req_flags)) {
2929 ceph_encode_32(p, sizeof(__le64));
2930 ceph_encode_64(p, req->r_fscrypt_file);
2931 } else {
2932 ceph_encode_32(p, 0);
2933 }
2934}
2935
2936static inline u16 mds_supported_head_version(struct ceph_mds_session *session)
2937{
2938 if (!test_bit(CEPHFS_FEATURE_32BITS_RETRY_FWD, &session->s_features))
2939 return 1;
2940
2941 if (!test_bit(CEPHFS_FEATURE_HAS_OWNER_UIDGID, &session->s_features))
2942 return 2;
2943
2944 return CEPH_MDS_REQUEST_HEAD_VERSION;
2945}
2946
2947static struct ceph_mds_request_head_legacy *
2948find_legacy_request_head(void *p, u64 features)
2949{
2950 bool legacy = !(features & CEPH_FEATURE_FS_BTIME);
2951 struct ceph_mds_request_head *head;
2952
2953 if (legacy)
2954 return (struct ceph_mds_request_head_legacy *)p;
2955 head = (struct ceph_mds_request_head *)p;
2956 return (struct ceph_mds_request_head_legacy *)&head->oldest_client_tid;
2957}
2958
2959/*
2960 * called under mdsc->mutex
2961 */
2962static struct ceph_msg *create_request_message(struct ceph_mds_session *session,
2963 struct ceph_mds_request *req,
2964 bool drop_cap_releases)
2965{
2966 int mds = session->s_mds;
2967 struct ceph_mds_client *mdsc = session->s_mdsc;
2968 struct ceph_client *cl = mdsc->fsc->client;
2969 struct ceph_msg *msg;
2970 struct ceph_mds_request_head_legacy *lhead;
2971 const char *path1 = NULL;
2972 const char *path2 = NULL;
2973 u64 ino1 = 0, ino2 = 0;
2974 int pathlen1 = 0, pathlen2 = 0;
2975 bool freepath1 = false, freepath2 = false;
2976 struct dentry *old_dentry = NULL;
2977 int len;
2978 u16 releases;
2979 void *p, *end;
2980 int ret;
2981 bool legacy = !(session->s_con.peer_features & CEPH_FEATURE_FS_BTIME);
2982 u16 request_head_version = mds_supported_head_version(session);
2983 kuid_t caller_fsuid = req->r_cred->fsuid;
2984 kgid_t caller_fsgid = req->r_cred->fsgid;
2985
2986 ret = set_request_path_attr(mdsc, req->r_inode, req->r_dentry,
2987 req->r_parent, req->r_path1, req->r_ino1.ino,
2988 &path1, &pathlen1, &ino1, &freepath1,
2989 test_bit(CEPH_MDS_R_PARENT_LOCKED,
2990 &req->r_req_flags));
2991 if (ret < 0) {
2992 msg = ERR_PTR(ret);
2993 goto out;
2994 }
2995
2996 /* If r_old_dentry is set, then assume that its parent is locked */
2997 if (req->r_old_dentry &&
2998 !(req->r_old_dentry->d_flags & DCACHE_DISCONNECTED))
2999 old_dentry = req->r_old_dentry;
3000 ret = set_request_path_attr(mdsc, NULL, old_dentry,
3001 req->r_old_dentry_dir,
3002 req->r_path2, req->r_ino2.ino,
3003 &path2, &pathlen2, &ino2, &freepath2, true);
3004 if (ret < 0) {
3005 msg = ERR_PTR(ret);
3006 goto out_free1;
3007 }
3008
3009 req->r_altname = get_fscrypt_altname(req, &req->r_altname_len);
3010 if (IS_ERR(req->r_altname)) {
3011 msg = ERR_CAST(req->r_altname);
3012 req->r_altname = NULL;
3013 goto out_free2;
3014 }
3015
3016 /*
3017 * For old cephs without supporting the 32bit retry/fwd feature
3018 * it will copy the raw memories directly when decoding the
3019 * requests. While new cephs will decode the head depending the
3020 * version member, so we need to make sure it will be compatible
3021 * with them both.
3022 */
3023 if (legacy)
3024 len = sizeof(struct ceph_mds_request_head_legacy);
3025 else if (request_head_version == 1)
3026 len = offsetofend(struct ceph_mds_request_head, args);
3027 else if (request_head_version == 2)
3028 len = offsetofend(struct ceph_mds_request_head, ext_num_fwd);
3029 else
3030 len = sizeof(struct ceph_mds_request_head);
3031
3032 /* filepaths */
3033 len += 2 * (1 + sizeof(u32) + sizeof(u64));
3034 len += pathlen1 + pathlen2;
3035
3036 /* cap releases */
3037 len += sizeof(struct ceph_mds_request_release) *
3038 (!!req->r_inode_drop + !!req->r_dentry_drop +
3039 !!req->r_old_inode_drop + !!req->r_old_dentry_drop);
3040
3041 if (req->r_dentry_drop)
3042 len += pathlen1;
3043 if (req->r_old_dentry_drop)
3044 len += pathlen2;
3045
3046 /* MClientRequest tail */
3047
3048 /* req->r_stamp */
3049 len += sizeof(struct ceph_timespec);
3050
3051 /* gid list */
3052 len += sizeof(u32) + (sizeof(u64) * req->r_cred->group_info->ngroups);
3053
3054 /* alternate name */
3055 len += sizeof(u32) + req->r_altname_len;
3056
3057 /* fscrypt_auth */
3058 len += sizeof(u32); // fscrypt_auth
3059 if (req->r_fscrypt_auth)
3060 len += ceph_fscrypt_auth_len(req->r_fscrypt_auth);
3061
3062 /* fscrypt_file */
3063 len += sizeof(u32);
3064 if (test_bit(CEPH_MDS_R_FSCRYPT_FILE, &req->r_req_flags))
3065 len += sizeof(__le64);
3066
3067 msg = ceph_msg_new2(CEPH_MSG_CLIENT_REQUEST, len, 1, GFP_NOFS, false);
3068 if (!msg) {
3069 msg = ERR_PTR(-ENOMEM);
3070 goto out_free2;
3071 }
3072
3073 msg->hdr.tid = cpu_to_le64(req->r_tid);
3074
3075 lhead = find_legacy_request_head(msg->front.iov_base,
3076 session->s_con.peer_features);
3077
3078 if ((req->r_mnt_idmap != &nop_mnt_idmap) &&
3079 !test_bit(CEPHFS_FEATURE_HAS_OWNER_UIDGID, &session->s_features)) {
3080 WARN_ON_ONCE(!IS_CEPH_MDS_OP_NEWINODE(req->r_op));
3081
3082 if (enable_unsafe_idmap) {
3083 pr_warn_once_client(cl,
3084 "idmapped mount is used and CEPHFS_FEATURE_HAS_OWNER_UIDGID"
3085 " is not supported by MDS. UID/GID-based restrictions may"
3086 " not work properly.\n");
3087
3088 caller_fsuid = from_vfsuid(req->r_mnt_idmap, &init_user_ns,
3089 VFSUIDT_INIT(req->r_cred->fsuid));
3090 caller_fsgid = from_vfsgid(req->r_mnt_idmap, &init_user_ns,
3091 VFSGIDT_INIT(req->r_cred->fsgid));
3092 } else {
3093 pr_err_ratelimited_client(cl,
3094 "idmapped mount is used and CEPHFS_FEATURE_HAS_OWNER_UIDGID"
3095 " is not supported by MDS. Fail request with -EIO.\n");
3096
3097 ret = -EIO;
3098 goto out_err;
3099 }
3100 }
3101
3102 /*
3103 * The ceph_mds_request_head_legacy didn't contain a version field, and
3104 * one was added when we moved the message version from 3->4.
3105 */
3106 if (legacy) {
3107 msg->hdr.version = cpu_to_le16(3);
3108 p = msg->front.iov_base + sizeof(*lhead);
3109 } else if (request_head_version == 1) {
3110 struct ceph_mds_request_head *nhead = msg->front.iov_base;
3111
3112 msg->hdr.version = cpu_to_le16(4);
3113 nhead->version = cpu_to_le16(1);
3114 p = msg->front.iov_base + offsetofend(struct ceph_mds_request_head, args);
3115 } else if (request_head_version == 2) {
3116 struct ceph_mds_request_head *nhead = msg->front.iov_base;
3117
3118 msg->hdr.version = cpu_to_le16(6);
3119 nhead->version = cpu_to_le16(2);
3120
3121 p = msg->front.iov_base + offsetofend(struct ceph_mds_request_head, ext_num_fwd);
3122 } else {
3123 struct ceph_mds_request_head *nhead = msg->front.iov_base;
3124 kuid_t owner_fsuid;
3125 kgid_t owner_fsgid;
3126
3127 msg->hdr.version = cpu_to_le16(6);
3128 nhead->version = cpu_to_le16(CEPH_MDS_REQUEST_HEAD_VERSION);
3129 nhead->struct_len = cpu_to_le32(sizeof(struct ceph_mds_request_head));
3130
3131 if (IS_CEPH_MDS_OP_NEWINODE(req->r_op)) {
3132 owner_fsuid = from_vfsuid(req->r_mnt_idmap, &init_user_ns,
3133 VFSUIDT_INIT(req->r_cred->fsuid));
3134 owner_fsgid = from_vfsgid(req->r_mnt_idmap, &init_user_ns,
3135 VFSGIDT_INIT(req->r_cred->fsgid));
3136 nhead->owner_uid = cpu_to_le32(from_kuid(&init_user_ns, owner_fsuid));
3137 nhead->owner_gid = cpu_to_le32(from_kgid(&init_user_ns, owner_fsgid));
3138 } else {
3139 nhead->owner_uid = cpu_to_le32(-1);
3140 nhead->owner_gid = cpu_to_le32(-1);
3141 }
3142
3143 p = msg->front.iov_base + sizeof(*nhead);
3144 }
3145
3146 end = msg->front.iov_base + msg->front.iov_len;
3147
3148 lhead->mdsmap_epoch = cpu_to_le32(mdsc->mdsmap->m_epoch);
3149 lhead->op = cpu_to_le32(req->r_op);
3150 lhead->caller_uid = cpu_to_le32(from_kuid(&init_user_ns,
3151 caller_fsuid));
3152 lhead->caller_gid = cpu_to_le32(from_kgid(&init_user_ns,
3153 caller_fsgid));
3154 lhead->ino = cpu_to_le64(req->r_deleg_ino);
3155 lhead->args = req->r_args;
3156
3157 ceph_encode_filepath(&p, end, ino1, path1);
3158 ceph_encode_filepath(&p, end, ino2, path2);
3159
3160 /* make note of release offset, in case we need to replay */
3161 req->r_request_release_offset = p - msg->front.iov_base;
3162
3163 /* cap releases */
3164 releases = 0;
3165 if (req->r_inode_drop)
3166 releases += ceph_encode_inode_release(&p,
3167 req->r_inode ? req->r_inode : d_inode(req->r_dentry),
3168 mds, req->r_inode_drop, req->r_inode_unless,
3169 req->r_op == CEPH_MDS_OP_READDIR);
3170 if (req->r_dentry_drop) {
3171 ret = ceph_encode_dentry_release(&p, req->r_dentry,
3172 req->r_parent, mds, req->r_dentry_drop,
3173 req->r_dentry_unless);
3174 if (ret < 0)
3175 goto out_err;
3176 releases += ret;
3177 }
3178 if (req->r_old_dentry_drop) {
3179 ret = ceph_encode_dentry_release(&p, req->r_old_dentry,
3180 req->r_old_dentry_dir, mds,
3181 req->r_old_dentry_drop,
3182 req->r_old_dentry_unless);
3183 if (ret < 0)
3184 goto out_err;
3185 releases += ret;
3186 }
3187 if (req->r_old_inode_drop)
3188 releases += ceph_encode_inode_release(&p,
3189 d_inode(req->r_old_dentry),
3190 mds, req->r_old_inode_drop, req->r_old_inode_unless, 0);
3191
3192 if (drop_cap_releases) {
3193 releases = 0;
3194 p = msg->front.iov_base + req->r_request_release_offset;
3195 }
3196
3197 lhead->num_releases = cpu_to_le16(releases);
3198
3199 encode_mclientrequest_tail(&p, req);
3200
3201 if (WARN_ON_ONCE(p > end)) {
3202 ceph_msg_put(msg);
3203 msg = ERR_PTR(-ERANGE);
3204 goto out_free2;
3205 }
3206
3207 msg->front.iov_len = p - msg->front.iov_base;
3208 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
3209
3210 if (req->r_pagelist) {
3211 struct ceph_pagelist *pagelist = req->r_pagelist;
3212 ceph_msg_data_add_pagelist(msg, pagelist);
3213 msg->hdr.data_len = cpu_to_le32(pagelist->length);
3214 } else {
3215 msg->hdr.data_len = 0;
3216 }
3217
3218 msg->hdr.data_off = cpu_to_le16(0);
3219
3220out_free2:
3221 if (freepath2)
3222 ceph_mdsc_free_path((char *)path2, pathlen2);
3223out_free1:
3224 if (freepath1)
3225 ceph_mdsc_free_path((char *)path1, pathlen1);
3226out:
3227 return msg;
3228out_err:
3229 ceph_msg_put(msg);
3230 msg = ERR_PTR(ret);
3231 goto out_free2;
3232}
3233
3234/*
3235 * called under mdsc->mutex if error, under no mutex if
3236 * success.
3237 */
3238static void complete_request(struct ceph_mds_client *mdsc,
3239 struct ceph_mds_request *req)
3240{
3241 req->r_end_latency = ktime_get();
3242
3243 if (req->r_callback)
3244 req->r_callback(mdsc, req);
3245 complete_all(&req->r_completion);
3246}
3247
3248/*
3249 * called under mdsc->mutex
3250 */
3251static int __prepare_send_request(struct ceph_mds_session *session,
3252 struct ceph_mds_request *req,
3253 bool drop_cap_releases)
3254{
3255 int mds = session->s_mds;
3256 struct ceph_mds_client *mdsc = session->s_mdsc;
3257 struct ceph_client *cl = mdsc->fsc->client;
3258 struct ceph_mds_request_head_legacy *lhead;
3259 struct ceph_mds_request_head *nhead;
3260 struct ceph_msg *msg;
3261 int flags = 0, old_max_retry;
3262 bool old_version = !test_bit(CEPHFS_FEATURE_32BITS_RETRY_FWD,
3263 &session->s_features);
3264
3265 /*
3266 * Avoid infinite retrying after overflow. The client will
3267 * increase the retry count and if the MDS is old version,
3268 * so we limit to retry at most 256 times.
3269 */
3270 if (req->r_attempts) {
3271 old_max_retry = sizeof_field(struct ceph_mds_request_head,
3272 num_retry);
3273 old_max_retry = 1 << (old_max_retry * BITS_PER_BYTE);
3274 if ((old_version && req->r_attempts >= old_max_retry) ||
3275 ((uint32_t)req->r_attempts >= U32_MAX)) {
3276 pr_warn_ratelimited_client(cl, "request tid %llu seq overflow\n",
3277 req->r_tid);
3278 return -EMULTIHOP;
3279 }
3280 }
3281
3282 req->r_attempts++;
3283 if (req->r_inode) {
3284 struct ceph_cap *cap =
3285 ceph_get_cap_for_mds(ceph_inode(req->r_inode), mds);
3286
3287 if (cap)
3288 req->r_sent_on_mseq = cap->mseq;
3289 else
3290 req->r_sent_on_mseq = -1;
3291 }
3292 doutc(cl, "%p tid %lld %s (attempt %d)\n", req, req->r_tid,
3293 ceph_mds_op_name(req->r_op), req->r_attempts);
3294
3295 if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) {
3296 void *p;
3297
3298 /*
3299 * Replay. Do not regenerate message (and rebuild
3300 * paths, etc.); just use the original message.
3301 * Rebuilding paths will break for renames because
3302 * d_move mangles the src name.
3303 */
3304 msg = req->r_request;
3305 lhead = find_legacy_request_head(msg->front.iov_base,
3306 session->s_con.peer_features);
3307
3308 flags = le32_to_cpu(lhead->flags);
3309 flags |= CEPH_MDS_FLAG_REPLAY;
3310 lhead->flags = cpu_to_le32(flags);
3311
3312 if (req->r_target_inode)
3313 lhead->ino = cpu_to_le64(ceph_ino(req->r_target_inode));
3314
3315 lhead->num_retry = req->r_attempts - 1;
3316 if (!old_version) {
3317 nhead = (struct ceph_mds_request_head*)msg->front.iov_base;
3318 nhead->ext_num_retry = cpu_to_le32(req->r_attempts - 1);
3319 }
3320
3321 /* remove cap/dentry releases from message */
3322 lhead->num_releases = 0;
3323
3324 p = msg->front.iov_base + req->r_request_release_offset;
3325 encode_mclientrequest_tail(&p, req);
3326
3327 msg->front.iov_len = p - msg->front.iov_base;
3328 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
3329 return 0;
3330 }
3331
3332 if (req->r_request) {
3333 ceph_msg_put(req->r_request);
3334 req->r_request = NULL;
3335 }
3336 msg = create_request_message(session, req, drop_cap_releases);
3337 if (IS_ERR(msg)) {
3338 req->r_err = PTR_ERR(msg);
3339 return PTR_ERR(msg);
3340 }
3341 req->r_request = msg;
3342
3343 lhead = find_legacy_request_head(msg->front.iov_base,
3344 session->s_con.peer_features);
3345 lhead->oldest_client_tid = cpu_to_le64(__get_oldest_tid(mdsc));
3346 if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags))
3347 flags |= CEPH_MDS_FLAG_REPLAY;
3348 if (test_bit(CEPH_MDS_R_ASYNC, &req->r_req_flags))
3349 flags |= CEPH_MDS_FLAG_ASYNC;
3350 if (req->r_parent)
3351 flags |= CEPH_MDS_FLAG_WANT_DENTRY;
3352 lhead->flags = cpu_to_le32(flags);
3353 lhead->num_fwd = req->r_num_fwd;
3354 lhead->num_retry = req->r_attempts - 1;
3355 if (!old_version) {
3356 nhead = (struct ceph_mds_request_head*)msg->front.iov_base;
3357 nhead->ext_num_fwd = cpu_to_le32(req->r_num_fwd);
3358 nhead->ext_num_retry = cpu_to_le32(req->r_attempts - 1);
3359 }
3360
3361 doutc(cl, " r_parent = %p\n", req->r_parent);
3362 return 0;
3363}
3364
3365/*
3366 * called under mdsc->mutex
3367 */
3368static int __send_request(struct ceph_mds_session *session,
3369 struct ceph_mds_request *req,
3370 bool drop_cap_releases)
3371{
3372 int err;
3373
3374 err = __prepare_send_request(session, req, drop_cap_releases);
3375 if (!err) {
3376 ceph_msg_get(req->r_request);
3377 ceph_con_send(&session->s_con, req->r_request);
3378 }
3379
3380 return err;
3381}
3382
3383/*
3384 * send request, or put it on the appropriate wait list.
3385 */
3386static void __do_request(struct ceph_mds_client *mdsc,
3387 struct ceph_mds_request *req)
3388{
3389 struct ceph_client *cl = mdsc->fsc->client;
3390 struct ceph_mds_session *session = NULL;
3391 int mds = -1;
3392 int err = 0;
3393 bool random;
3394
3395 if (req->r_err || test_bit(CEPH_MDS_R_GOT_RESULT, &req->r_req_flags)) {
3396 if (test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags))
3397 __unregister_request(mdsc, req);
3398 return;
3399 }
3400
3401 if (READ_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_FENCE_IO) {
3402 doutc(cl, "metadata corrupted\n");
3403 err = -EIO;
3404 goto finish;
3405 }
3406 if (req->r_timeout &&
3407 time_after_eq(jiffies, req->r_started + req->r_timeout)) {
3408 doutc(cl, "timed out\n");
3409 err = -ETIMEDOUT;
3410 goto finish;
3411 }
3412 if (READ_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_SHUTDOWN) {
3413 doutc(cl, "forced umount\n");
3414 err = -EIO;
3415 goto finish;
3416 }
3417 if (READ_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_MOUNTING) {
3418 if (mdsc->mdsmap_err) {
3419 err = mdsc->mdsmap_err;
3420 doutc(cl, "mdsmap err %d\n", err);
3421 goto finish;
3422 }
3423 if (mdsc->mdsmap->m_epoch == 0) {
3424 doutc(cl, "no mdsmap, waiting for map\n");
3425 list_add(&req->r_wait, &mdsc->waiting_for_map);
3426 return;
3427 }
3428 if (!(mdsc->fsc->mount_options->flags &
3429 CEPH_MOUNT_OPT_MOUNTWAIT) &&
3430 !ceph_mdsmap_is_cluster_available(mdsc->mdsmap)) {
3431 err = -EHOSTUNREACH;
3432 goto finish;
3433 }
3434 }
3435
3436 put_request_session(req);
3437
3438 mds = __choose_mds(mdsc, req, &random);
3439 if (mds < 0 ||
3440 ceph_mdsmap_get_state(mdsc->mdsmap, mds) < CEPH_MDS_STATE_ACTIVE) {
3441 if (test_bit(CEPH_MDS_R_ASYNC, &req->r_req_flags)) {
3442 err = -EJUKEBOX;
3443 goto finish;
3444 }
3445 doutc(cl, "no mds or not active, waiting for map\n");
3446 list_add(&req->r_wait, &mdsc->waiting_for_map);
3447 return;
3448 }
3449
3450 /* get, open session */
3451 session = __ceph_lookup_mds_session(mdsc, mds);
3452 if (!session) {
3453 session = register_session(mdsc, mds);
3454 if (IS_ERR(session)) {
3455 err = PTR_ERR(session);
3456 goto finish;
3457 }
3458 }
3459 req->r_session = ceph_get_mds_session(session);
3460
3461 doutc(cl, "mds%d session %p state %s\n", mds, session,
3462 ceph_session_state_name(session->s_state));
3463
3464 /*
3465 * The old ceph will crash the MDSs when see unknown OPs
3466 */
3467 if (req->r_feature_needed > 0 &&
3468 !test_bit(req->r_feature_needed, &session->s_features)) {
3469 err = -EOPNOTSUPP;
3470 goto out_session;
3471 }
3472
3473 if (session->s_state != CEPH_MDS_SESSION_OPEN &&
3474 session->s_state != CEPH_MDS_SESSION_HUNG) {
3475 /*
3476 * We cannot queue async requests since the caps and delegated
3477 * inodes are bound to the session. Just return -EJUKEBOX and
3478 * let the caller retry a sync request in that case.
3479 */
3480 if (test_bit(CEPH_MDS_R_ASYNC, &req->r_req_flags)) {
3481 err = -EJUKEBOX;
3482 goto out_session;
3483 }
3484
3485 /*
3486 * If the session has been REJECTED, then return a hard error,
3487 * unless it's a CLEANRECOVER mount, in which case we'll queue
3488 * it to the mdsc queue.
3489 */
3490 if (session->s_state == CEPH_MDS_SESSION_REJECTED) {
3491 if (ceph_test_mount_opt(mdsc->fsc, CLEANRECOVER))
3492 list_add(&req->r_wait, &mdsc->waiting_for_map);
3493 else
3494 err = -EACCES;
3495 goto out_session;
3496 }
3497
3498 if (session->s_state == CEPH_MDS_SESSION_NEW ||
3499 session->s_state == CEPH_MDS_SESSION_CLOSING) {
3500 err = __open_session(mdsc, session);
3501 if (err)
3502 goto out_session;
3503 /* retry the same mds later */
3504 if (random)
3505 req->r_resend_mds = mds;
3506 }
3507 list_add(&req->r_wait, &session->s_waiting);
3508 goto out_session;
3509 }
3510
3511 /* send request */
3512 req->r_resend_mds = -1; /* forget any previous mds hint */
3513
3514 if (req->r_request_started == 0) /* note request start time */
3515 req->r_request_started = jiffies;
3516
3517 /*
3518 * For async create we will choose the auth MDS of frag in parent
3519 * directory to send the request and usually this works fine, but
3520 * if the migrated the dirtory to another MDS before it could handle
3521 * it the request will be forwarded.
3522 *
3523 * And then the auth cap will be changed.
3524 */
3525 if (test_bit(CEPH_MDS_R_ASYNC, &req->r_req_flags) && req->r_num_fwd) {
3526 struct ceph_dentry_info *di = ceph_dentry(req->r_dentry);
3527 struct ceph_inode_info *ci;
3528 struct ceph_cap *cap;
3529
3530 /*
3531 * The request maybe handled very fast and the new inode
3532 * hasn't been linked to the dentry yet. We need to wait
3533 * for the ceph_finish_async_create(), which shouldn't be
3534 * stuck too long or fail in thoery, to finish when forwarding
3535 * the request.
3536 */
3537 if (!d_inode(req->r_dentry)) {
3538 err = wait_on_bit(&di->flags, CEPH_DENTRY_ASYNC_CREATE_BIT,
3539 TASK_KILLABLE);
3540 if (err) {
3541 mutex_lock(&req->r_fill_mutex);
3542 set_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags);
3543 mutex_unlock(&req->r_fill_mutex);
3544 goto out_session;
3545 }
3546 }
3547
3548 ci = ceph_inode(d_inode(req->r_dentry));
3549
3550 spin_lock(&ci->i_ceph_lock);
3551 cap = ci->i_auth_cap;
3552 if (ci->i_ceph_flags & CEPH_I_ASYNC_CREATE && mds != cap->mds) {
3553 doutc(cl, "session changed for auth cap %d -> %d\n",
3554 cap->session->s_mds, session->s_mds);
3555
3556 /* Remove the auth cap from old session */
3557 spin_lock(&cap->session->s_cap_lock);
3558 cap->session->s_nr_caps--;
3559 list_del_init(&cap->session_caps);
3560 spin_unlock(&cap->session->s_cap_lock);
3561
3562 /* Add the auth cap to the new session */
3563 cap->mds = mds;
3564 cap->session = session;
3565 spin_lock(&session->s_cap_lock);
3566 session->s_nr_caps++;
3567 list_add_tail(&cap->session_caps, &session->s_caps);
3568 spin_unlock(&session->s_cap_lock);
3569
3570 change_auth_cap_ses(ci, session);
3571 }
3572 spin_unlock(&ci->i_ceph_lock);
3573 }
3574
3575 err = __send_request(session, req, false);
3576
3577out_session:
3578 ceph_put_mds_session(session);
3579finish:
3580 if (err) {
3581 doutc(cl, "early error %d\n", err);
3582 req->r_err = err;
3583 complete_request(mdsc, req);
3584 __unregister_request(mdsc, req);
3585 }
3586 return;
3587}
3588
3589/*
3590 * called under mdsc->mutex
3591 */
3592static void __wake_requests(struct ceph_mds_client *mdsc,
3593 struct list_head *head)
3594{
3595 struct ceph_client *cl = mdsc->fsc->client;
3596 struct ceph_mds_request *req;
3597 LIST_HEAD(tmp_list);
3598
3599 list_splice_init(head, &tmp_list);
3600
3601 while (!list_empty(&tmp_list)) {
3602 req = list_entry(tmp_list.next,
3603 struct ceph_mds_request, r_wait);
3604 list_del_init(&req->r_wait);
3605 doutc(cl, " wake request %p tid %llu\n", req,
3606 req->r_tid);
3607 __do_request(mdsc, req);
3608 }
3609}
3610
3611/*
3612 * Wake up threads with requests pending for @mds, so that they can
3613 * resubmit their requests to a possibly different mds.
3614 */
3615static void kick_requests(struct ceph_mds_client *mdsc, int mds)
3616{
3617 struct ceph_client *cl = mdsc->fsc->client;
3618 struct ceph_mds_request *req;
3619 struct rb_node *p = rb_first(&mdsc->request_tree);
3620
3621 doutc(cl, "kick_requests mds%d\n", mds);
3622 while (p) {
3623 req = rb_entry(p, struct ceph_mds_request, r_node);
3624 p = rb_next(p);
3625 if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags))
3626 continue;
3627 if (req->r_attempts > 0)
3628 continue; /* only new requests */
3629 if (req->r_session &&
3630 req->r_session->s_mds == mds) {
3631 doutc(cl, " kicking tid %llu\n", req->r_tid);
3632 list_del_init(&req->r_wait);
3633 __do_request(mdsc, req);
3634 }
3635 }
3636}
3637
3638int ceph_mdsc_submit_request(struct ceph_mds_client *mdsc, struct inode *dir,
3639 struct ceph_mds_request *req)
3640{
3641 struct ceph_client *cl = mdsc->fsc->client;
3642 int err = 0;
3643
3644 /* take CAP_PIN refs for r_inode, r_parent, r_old_dentry */
3645 if (req->r_inode)
3646 ceph_get_cap_refs(ceph_inode(req->r_inode), CEPH_CAP_PIN);
3647 if (req->r_parent) {
3648 struct ceph_inode_info *ci = ceph_inode(req->r_parent);
3649 int fmode = (req->r_op & CEPH_MDS_OP_WRITE) ?
3650 CEPH_FILE_MODE_WR : CEPH_FILE_MODE_RD;
3651 spin_lock(&ci->i_ceph_lock);
3652 ceph_take_cap_refs(ci, CEPH_CAP_PIN, false);
3653 __ceph_touch_fmode(ci, mdsc, fmode);
3654 spin_unlock(&ci->i_ceph_lock);
3655 }
3656 if (req->r_old_dentry_dir)
3657 ceph_get_cap_refs(ceph_inode(req->r_old_dentry_dir),
3658 CEPH_CAP_PIN);
3659
3660 if (req->r_inode) {
3661 err = ceph_wait_on_async_create(req->r_inode);
3662 if (err) {
3663 doutc(cl, "wait for async create returned: %d\n", err);
3664 return err;
3665 }
3666 }
3667
3668 if (!err && req->r_old_inode) {
3669 err = ceph_wait_on_async_create(req->r_old_inode);
3670 if (err) {
3671 doutc(cl, "wait for async create returned: %d\n", err);
3672 return err;
3673 }
3674 }
3675
3676 doutc(cl, "submit_request on %p for inode %p\n", req, dir);
3677 mutex_lock(&mdsc->mutex);
3678 __register_request(mdsc, req, dir);
3679 __do_request(mdsc, req);
3680 err = req->r_err;
3681 mutex_unlock(&mdsc->mutex);
3682 return err;
3683}
3684
3685int ceph_mdsc_wait_request(struct ceph_mds_client *mdsc,
3686 struct ceph_mds_request *req,
3687 ceph_mds_request_wait_callback_t wait_func)
3688{
3689 struct ceph_client *cl = mdsc->fsc->client;
3690 int err;
3691
3692 /* wait */
3693 doutc(cl, "do_request waiting\n");
3694 if (wait_func) {
3695 err = wait_func(mdsc, req);
3696 } else {
3697 long timeleft = wait_for_completion_killable_timeout(
3698 &req->r_completion,
3699 ceph_timeout_jiffies(req->r_timeout));
3700 if (timeleft > 0)
3701 err = 0;
3702 else if (!timeleft)
3703 err = -ETIMEDOUT; /* timed out */
3704 else
3705 err = timeleft; /* killed */
3706 }
3707 doutc(cl, "do_request waited, got %d\n", err);
3708 mutex_lock(&mdsc->mutex);
3709
3710 /* only abort if we didn't race with a real reply */
3711 if (test_bit(CEPH_MDS_R_GOT_RESULT, &req->r_req_flags)) {
3712 err = le32_to_cpu(req->r_reply_info.head->result);
3713 } else if (err < 0) {
3714 doutc(cl, "aborted request %lld with %d\n", req->r_tid, err);
3715
3716 /*
3717 * ensure we aren't running concurrently with
3718 * ceph_fill_trace or ceph_readdir_prepopulate, which
3719 * rely on locks (dir mutex) held by our caller.
3720 */
3721 mutex_lock(&req->r_fill_mutex);
3722 req->r_err = err;
3723 set_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags);
3724 mutex_unlock(&req->r_fill_mutex);
3725
3726 if (req->r_parent &&
3727 (req->r_op & CEPH_MDS_OP_WRITE))
3728 ceph_invalidate_dir_request(req);
3729 } else {
3730 err = req->r_err;
3731 }
3732
3733 mutex_unlock(&mdsc->mutex);
3734 return err;
3735}
3736
3737/*
3738 * Synchrously perform an mds request. Take care of all of the
3739 * session setup, forwarding, retry details.
3740 */
3741int ceph_mdsc_do_request(struct ceph_mds_client *mdsc,
3742 struct inode *dir,
3743 struct ceph_mds_request *req)
3744{
3745 struct ceph_client *cl = mdsc->fsc->client;
3746 int err;
3747
3748 doutc(cl, "do_request on %p\n", req);
3749
3750 /* issue */
3751 err = ceph_mdsc_submit_request(mdsc, dir, req);
3752 if (!err)
3753 err = ceph_mdsc_wait_request(mdsc, req, NULL);
3754 doutc(cl, "do_request %p done, result %d\n", req, err);
3755 return err;
3756}
3757
3758/*
3759 * Invalidate dir's completeness, dentry lease state on an aborted MDS
3760 * namespace request.
3761 */
3762void ceph_invalidate_dir_request(struct ceph_mds_request *req)
3763{
3764 struct inode *dir = req->r_parent;
3765 struct inode *old_dir = req->r_old_dentry_dir;
3766 struct ceph_client *cl = req->r_mdsc->fsc->client;
3767
3768 doutc(cl, "invalidate_dir_request %p %p (complete, lease(s))\n",
3769 dir, old_dir);
3770
3771 ceph_dir_clear_complete(dir);
3772 if (old_dir)
3773 ceph_dir_clear_complete(old_dir);
3774 if (req->r_dentry)
3775 ceph_invalidate_dentry_lease(req->r_dentry);
3776 if (req->r_old_dentry)
3777 ceph_invalidate_dentry_lease(req->r_old_dentry);
3778}
3779
3780/*
3781 * Handle mds reply.
3782 *
3783 * We take the session mutex and parse and process the reply immediately.
3784 * This preserves the logical ordering of replies, capabilities, etc., sent
3785 * by the MDS as they are applied to our local cache.
3786 */
3787static void handle_reply(struct ceph_mds_session *session, struct ceph_msg *msg)
3788{
3789 struct ceph_mds_client *mdsc = session->s_mdsc;
3790 struct ceph_client *cl = mdsc->fsc->client;
3791 struct ceph_mds_request *req;
3792 struct ceph_mds_reply_head *head = msg->front.iov_base;
3793 struct ceph_mds_reply_info_parsed *rinfo; /* parsed reply info */
3794 struct ceph_snap_realm *realm;
3795 u64 tid;
3796 int err, result;
3797 int mds = session->s_mds;
3798 bool close_sessions = false;
3799
3800 if (msg->front.iov_len < sizeof(*head)) {
3801 pr_err_client(cl, "got corrupt (short) reply\n");
3802 ceph_msg_dump(msg);
3803 return;
3804 }
3805
3806 /* get request, session */
3807 tid = le64_to_cpu(msg->hdr.tid);
3808 mutex_lock(&mdsc->mutex);
3809 req = lookup_get_request(mdsc, tid);
3810 if (!req) {
3811 doutc(cl, "on unknown tid %llu\n", tid);
3812 mutex_unlock(&mdsc->mutex);
3813 return;
3814 }
3815 doutc(cl, "handle_reply %p\n", req);
3816
3817 /* correct session? */
3818 if (req->r_session != session) {
3819 pr_err_client(cl, "got %llu on session mds%d not mds%d\n",
3820 tid, session->s_mds,
3821 req->r_session ? req->r_session->s_mds : -1);
3822 mutex_unlock(&mdsc->mutex);
3823 goto out;
3824 }
3825
3826 /* dup? */
3827 if ((test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags) && !head->safe) ||
3828 (test_bit(CEPH_MDS_R_GOT_SAFE, &req->r_req_flags) && head->safe)) {
3829 pr_warn_client(cl, "got a dup %s reply on %llu from mds%d\n",
3830 head->safe ? "safe" : "unsafe", tid, mds);
3831 mutex_unlock(&mdsc->mutex);
3832 goto out;
3833 }
3834 if (test_bit(CEPH_MDS_R_GOT_SAFE, &req->r_req_flags)) {
3835 pr_warn_client(cl, "got unsafe after safe on %llu from mds%d\n",
3836 tid, mds);
3837 mutex_unlock(&mdsc->mutex);
3838 goto out;
3839 }
3840
3841 result = le32_to_cpu(head->result);
3842
3843 if (head->safe) {
3844 set_bit(CEPH_MDS_R_GOT_SAFE, &req->r_req_flags);
3845 __unregister_request(mdsc, req);
3846
3847 /* last request during umount? */
3848 if (mdsc->stopping && !__get_oldest_req(mdsc))
3849 complete_all(&mdsc->safe_umount_waiters);
3850
3851 if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) {
3852 /*
3853 * We already handled the unsafe response, now do the
3854 * cleanup. No need to examine the response; the MDS
3855 * doesn't include any result info in the safe
3856 * response. And even if it did, there is nothing
3857 * useful we could do with a revised return value.
3858 */
3859 doutc(cl, "got safe reply %llu, mds%d\n", tid, mds);
3860
3861 mutex_unlock(&mdsc->mutex);
3862 goto out;
3863 }
3864 } else {
3865 set_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags);
3866 list_add_tail(&req->r_unsafe_item, &req->r_session->s_unsafe);
3867 }
3868
3869 doutc(cl, "tid %lld result %d\n", tid, result);
3870 if (test_bit(CEPHFS_FEATURE_REPLY_ENCODING, &session->s_features))
3871 err = parse_reply_info(session, msg, req, (u64)-1);
3872 else
3873 err = parse_reply_info(session, msg, req,
3874 session->s_con.peer_features);
3875 mutex_unlock(&mdsc->mutex);
3876
3877 /* Must find target inode outside of mutexes to avoid deadlocks */
3878 rinfo = &req->r_reply_info;
3879 if ((err >= 0) && rinfo->head->is_target) {
3880 struct inode *in = xchg(&req->r_new_inode, NULL);
3881 struct ceph_vino tvino = {
3882 .ino = le64_to_cpu(rinfo->targeti.in->ino),
3883 .snap = le64_to_cpu(rinfo->targeti.in->snapid)
3884 };
3885
3886 /*
3887 * If we ended up opening an existing inode, discard
3888 * r_new_inode
3889 */
3890 if (req->r_op == CEPH_MDS_OP_CREATE &&
3891 !req->r_reply_info.has_create_ino) {
3892 /* This should never happen on an async create */
3893 WARN_ON_ONCE(req->r_deleg_ino);
3894 iput(in);
3895 in = NULL;
3896 }
3897
3898 in = ceph_get_inode(mdsc->fsc->sb, tvino, in);
3899 if (IS_ERR(in)) {
3900 err = PTR_ERR(in);
3901 mutex_lock(&session->s_mutex);
3902 goto out_err;
3903 }
3904 req->r_target_inode = in;
3905 }
3906
3907 mutex_lock(&session->s_mutex);
3908 if (err < 0) {
3909 pr_err_client(cl, "got corrupt reply mds%d(tid:%lld)\n",
3910 mds, tid);
3911 ceph_msg_dump(msg);
3912 goto out_err;
3913 }
3914
3915 /* snap trace */
3916 realm = NULL;
3917 if (rinfo->snapblob_len) {
3918 down_write(&mdsc->snap_rwsem);
3919 err = ceph_update_snap_trace(mdsc, rinfo->snapblob,
3920 rinfo->snapblob + rinfo->snapblob_len,
3921 le32_to_cpu(head->op) == CEPH_MDS_OP_RMSNAP,
3922 &realm);
3923 if (err) {
3924 up_write(&mdsc->snap_rwsem);
3925 close_sessions = true;
3926 if (err == -EIO)
3927 ceph_msg_dump(msg);
3928 goto out_err;
3929 }
3930 downgrade_write(&mdsc->snap_rwsem);
3931 } else {
3932 down_read(&mdsc->snap_rwsem);
3933 }
3934
3935 /* insert trace into our cache */
3936 mutex_lock(&req->r_fill_mutex);
3937 current->journal_info = req;
3938 err = ceph_fill_trace(mdsc->fsc->sb, req);
3939 if (err == 0) {
3940 if (result == 0 && (req->r_op == CEPH_MDS_OP_READDIR ||
3941 req->r_op == CEPH_MDS_OP_LSSNAP))
3942 err = ceph_readdir_prepopulate(req, req->r_session);
3943 }
3944 current->journal_info = NULL;
3945 mutex_unlock(&req->r_fill_mutex);
3946
3947 up_read(&mdsc->snap_rwsem);
3948 if (realm)
3949 ceph_put_snap_realm(mdsc, realm);
3950
3951 if (err == 0) {
3952 if (req->r_target_inode &&
3953 test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) {
3954 struct ceph_inode_info *ci =
3955 ceph_inode(req->r_target_inode);
3956 spin_lock(&ci->i_unsafe_lock);
3957 list_add_tail(&req->r_unsafe_target_item,
3958 &ci->i_unsafe_iops);
3959 spin_unlock(&ci->i_unsafe_lock);
3960 }
3961
3962 ceph_unreserve_caps(mdsc, &req->r_caps_reservation);
3963 }
3964out_err:
3965 mutex_lock(&mdsc->mutex);
3966 if (!test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags)) {
3967 if (err) {
3968 req->r_err = err;
3969 } else {
3970 req->r_reply = ceph_msg_get(msg);
3971 set_bit(CEPH_MDS_R_GOT_RESULT, &req->r_req_flags);
3972 }
3973 } else {
3974 doutc(cl, "reply arrived after request %lld was aborted\n", tid);
3975 }
3976 mutex_unlock(&mdsc->mutex);
3977
3978 mutex_unlock(&session->s_mutex);
3979
3980 /* kick calling process */
3981 complete_request(mdsc, req);
3982
3983 ceph_update_metadata_metrics(&mdsc->metric, req->r_start_latency,
3984 req->r_end_latency, err);
3985out:
3986 ceph_mdsc_put_request(req);
3987
3988 /* Defer closing the sessions after s_mutex lock being released */
3989 if (close_sessions)
3990 ceph_mdsc_close_sessions(mdsc);
3991 return;
3992}
3993
3994
3995
3996/*
3997 * handle mds notification that our request has been forwarded.
3998 */
3999static void handle_forward(struct ceph_mds_client *mdsc,
4000 struct ceph_mds_session *session,
4001 struct ceph_msg *msg)
4002{
4003 struct ceph_client *cl = mdsc->fsc->client;
4004 struct ceph_mds_request *req;
4005 u64 tid = le64_to_cpu(msg->hdr.tid);
4006 u32 next_mds;
4007 u32 fwd_seq;
4008 int err = -EINVAL;
4009 void *p = msg->front.iov_base;
4010 void *end = p + msg->front.iov_len;
4011 bool aborted = false;
4012
4013 ceph_decode_need(&p, end, 2*sizeof(u32), bad);
4014 next_mds = ceph_decode_32(&p);
4015 fwd_seq = ceph_decode_32(&p);
4016
4017 mutex_lock(&mdsc->mutex);
4018 req = lookup_get_request(mdsc, tid);
4019 if (!req) {
4020 mutex_unlock(&mdsc->mutex);
4021 doutc(cl, "forward tid %llu to mds%d - req dne\n", tid, next_mds);
4022 return; /* dup reply? */
4023 }
4024
4025 if (test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags)) {
4026 doutc(cl, "forward tid %llu aborted, unregistering\n", tid);
4027 __unregister_request(mdsc, req);
4028 } else if (fwd_seq <= req->r_num_fwd || (uint32_t)fwd_seq >= U32_MAX) {
4029 /*
4030 * Avoid infinite retrying after overflow.
4031 *
4032 * The MDS will increase the fwd count and in client side
4033 * if the num_fwd is less than the one saved in request
4034 * that means the MDS is an old version and overflowed of
4035 * 8 bits.
4036 */
4037 mutex_lock(&req->r_fill_mutex);
4038 req->r_err = -EMULTIHOP;
4039 set_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags);
4040 mutex_unlock(&req->r_fill_mutex);
4041 aborted = true;
4042 pr_warn_ratelimited_client(cl, "forward tid %llu seq overflow\n",
4043 tid);
4044 } else {
4045 /* resend. forward race not possible; mds would drop */
4046 doutc(cl, "forward tid %llu to mds%d (we resend)\n", tid, next_mds);
4047 BUG_ON(req->r_err);
4048 BUG_ON(test_bit(CEPH_MDS_R_GOT_RESULT, &req->r_req_flags));
4049 req->r_attempts = 0;
4050 req->r_num_fwd = fwd_seq;
4051 req->r_resend_mds = next_mds;
4052 put_request_session(req);
4053 __do_request(mdsc, req);
4054 }
4055 mutex_unlock(&mdsc->mutex);
4056
4057 /* kick calling process */
4058 if (aborted)
4059 complete_request(mdsc, req);
4060 ceph_mdsc_put_request(req);
4061 return;
4062
4063bad:
4064 pr_err_client(cl, "decode error err=%d\n", err);
4065 ceph_msg_dump(msg);
4066}
4067
4068static int __decode_session_metadata(void **p, void *end,
4069 bool *blocklisted)
4070{
4071 /* map<string,string> */
4072 u32 n;
4073 bool err_str;
4074 ceph_decode_32_safe(p, end, n, bad);
4075 while (n-- > 0) {
4076 u32 len;
4077 ceph_decode_32_safe(p, end, len, bad);
4078 ceph_decode_need(p, end, len, bad);
4079 err_str = !strncmp(*p, "error_string", len);
4080 *p += len;
4081 ceph_decode_32_safe(p, end, len, bad);
4082 ceph_decode_need(p, end, len, bad);
4083 /*
4084 * Match "blocklisted (blacklisted)" from newer MDSes,
4085 * or "blacklisted" from older MDSes.
4086 */
4087 if (err_str && strnstr(*p, "blacklisted", len))
4088 *blocklisted = true;
4089 *p += len;
4090 }
4091 return 0;
4092bad:
4093 return -1;
4094}
4095
4096/*
4097 * handle a mds session control message
4098 */
4099static void handle_session(struct ceph_mds_session *session,
4100 struct ceph_msg *msg)
4101{
4102 struct ceph_mds_client *mdsc = session->s_mdsc;
4103 struct ceph_client *cl = mdsc->fsc->client;
4104 int mds = session->s_mds;
4105 int msg_version = le16_to_cpu(msg->hdr.version);
4106 void *p = msg->front.iov_base;
4107 void *end = p + msg->front.iov_len;
4108 struct ceph_mds_session_head *h;
4109 struct ceph_mds_cap_auth *cap_auths = NULL;
4110 u32 op, cap_auths_num = 0;
4111 u64 seq, features = 0;
4112 int wake = 0;
4113 bool blocklisted = false;
4114 u32 i;
4115
4116
4117 /* decode */
4118 ceph_decode_need(&p, end, sizeof(*h), bad);
4119 h = p;
4120 p += sizeof(*h);
4121
4122 op = le32_to_cpu(h->op);
4123 seq = le64_to_cpu(h->seq);
4124
4125 if (msg_version >= 3) {
4126 u32 len;
4127 /* version >= 2 and < 5, decode metadata, skip otherwise
4128 * as it's handled via flags.
4129 */
4130 if (msg_version >= 5)
4131 ceph_decode_skip_map(&p, end, string, string, bad);
4132 else if (__decode_session_metadata(&p, end, &blocklisted) < 0)
4133 goto bad;
4134
4135 /* version >= 3, feature bits */
4136 ceph_decode_32_safe(&p, end, len, bad);
4137 if (len) {
4138 ceph_decode_64_safe(&p, end, features, bad);
4139 p += len - sizeof(features);
4140 }
4141 }
4142
4143 if (msg_version >= 5) {
4144 u32 flags, len;
4145
4146 /* version >= 4 */
4147 ceph_decode_skip_16(&p, end, bad); /* struct_v, struct_cv */
4148 ceph_decode_32_safe(&p, end, len, bad); /* len */
4149 ceph_decode_skip_n(&p, end, len, bad); /* metric_spec */
4150
4151 /* version >= 5, flags */
4152 ceph_decode_32_safe(&p, end, flags, bad);
4153 if (flags & CEPH_SESSION_BLOCKLISTED) {
4154 pr_warn_client(cl, "mds%d session blocklisted\n",
4155 session->s_mds);
4156 blocklisted = true;
4157 }
4158 }
4159
4160 if (msg_version >= 6) {
4161 ceph_decode_32_safe(&p, end, cap_auths_num, bad);
4162 doutc(cl, "cap_auths_num %d\n", cap_auths_num);
4163
4164 if (cap_auths_num && op != CEPH_SESSION_OPEN) {
4165 WARN_ON_ONCE(op != CEPH_SESSION_OPEN);
4166 goto skip_cap_auths;
4167 }
4168
4169 cap_auths = kcalloc(cap_auths_num,
4170 sizeof(struct ceph_mds_cap_auth),
4171 GFP_KERNEL);
4172 if (!cap_auths) {
4173 pr_err_client(cl, "No memory for cap_auths\n");
4174 return;
4175 }
4176
4177 for (i = 0; i < cap_auths_num; i++) {
4178 u32 _len, j;
4179
4180 /* struct_v, struct_compat, and struct_len in MDSCapAuth */
4181 ceph_decode_skip_n(&p, end, 2 + sizeof(u32), bad);
4182
4183 /* struct_v, struct_compat, and struct_len in MDSCapMatch */
4184 ceph_decode_skip_n(&p, end, 2 + sizeof(u32), bad);
4185 ceph_decode_64_safe(&p, end, cap_auths[i].match.uid, bad);
4186 ceph_decode_32_safe(&p, end, _len, bad);
4187 if (_len) {
4188 cap_auths[i].match.gids = kcalloc(_len, sizeof(u32),
4189 GFP_KERNEL);
4190 if (!cap_auths[i].match.gids) {
4191 pr_err_client(cl, "No memory for gids\n");
4192 goto fail;
4193 }
4194
4195 cap_auths[i].match.num_gids = _len;
4196 for (j = 0; j < _len; j++)
4197 ceph_decode_32_safe(&p, end,
4198 cap_auths[i].match.gids[j],
4199 bad);
4200 }
4201
4202 ceph_decode_32_safe(&p, end, _len, bad);
4203 if (_len) {
4204 cap_auths[i].match.path = kcalloc(_len + 1, sizeof(char),
4205 GFP_KERNEL);
4206 if (!cap_auths[i].match.path) {
4207 pr_err_client(cl, "No memory for path\n");
4208 goto fail;
4209 }
4210 ceph_decode_copy(&p, cap_auths[i].match.path, _len);
4211
4212 /* Remove the tailing '/' */
4213 while (_len && cap_auths[i].match.path[_len - 1] == '/') {
4214 cap_auths[i].match.path[_len - 1] = '\0';
4215 _len -= 1;
4216 }
4217 }
4218
4219 ceph_decode_32_safe(&p, end, _len, bad);
4220 if (_len) {
4221 cap_auths[i].match.fs_name = kcalloc(_len + 1, sizeof(char),
4222 GFP_KERNEL);
4223 if (!cap_auths[i].match.fs_name) {
4224 pr_err_client(cl, "No memory for fs_name\n");
4225 goto fail;
4226 }
4227 ceph_decode_copy(&p, cap_auths[i].match.fs_name, _len);
4228 }
4229
4230 ceph_decode_8_safe(&p, end, cap_auths[i].match.root_squash, bad);
4231 ceph_decode_8_safe(&p, end, cap_auths[i].readable, bad);
4232 ceph_decode_8_safe(&p, end, cap_auths[i].writeable, bad);
4233 doutc(cl, "uid %lld, num_gids %u, path %s, fs_name %s, root_squash %d, readable %d, writeable %d\n",
4234 cap_auths[i].match.uid, cap_auths[i].match.num_gids,
4235 cap_auths[i].match.path, cap_auths[i].match.fs_name,
4236 cap_auths[i].match.root_squash,
4237 cap_auths[i].readable, cap_auths[i].writeable);
4238 }
4239 }
4240
4241skip_cap_auths:
4242 mutex_lock(&mdsc->mutex);
4243 if (op == CEPH_SESSION_OPEN) {
4244 if (mdsc->s_cap_auths) {
4245 for (i = 0; i < mdsc->s_cap_auths_num; i++) {
4246 kfree(mdsc->s_cap_auths[i].match.gids);
4247 kfree(mdsc->s_cap_auths[i].match.path);
4248 kfree(mdsc->s_cap_auths[i].match.fs_name);
4249 }
4250 kfree(mdsc->s_cap_auths);
4251 }
4252 mdsc->s_cap_auths_num = cap_auths_num;
4253 mdsc->s_cap_auths = cap_auths;
4254 }
4255 if (op == CEPH_SESSION_CLOSE) {
4256 ceph_get_mds_session(session);
4257 __unregister_session(mdsc, session);
4258 }
4259 /* FIXME: this ttl calculation is generous */
4260 session->s_ttl = jiffies + HZ*mdsc->mdsmap->m_session_autoclose;
4261 mutex_unlock(&mdsc->mutex);
4262
4263 mutex_lock(&session->s_mutex);
4264
4265 doutc(cl, "mds%d %s %p state %s seq %llu\n", mds,
4266 ceph_session_op_name(op), session,
4267 ceph_session_state_name(session->s_state), seq);
4268
4269 if (session->s_state == CEPH_MDS_SESSION_HUNG) {
4270 session->s_state = CEPH_MDS_SESSION_OPEN;
4271 pr_info_client(cl, "mds%d came back\n", session->s_mds);
4272 }
4273
4274 switch (op) {
4275 case CEPH_SESSION_OPEN:
4276 if (session->s_state == CEPH_MDS_SESSION_RECONNECTING)
4277 pr_info_client(cl, "mds%d reconnect success\n",
4278 session->s_mds);
4279
4280 session->s_features = features;
4281 if (session->s_state == CEPH_MDS_SESSION_OPEN) {
4282 pr_notice_client(cl, "mds%d is already opened\n",
4283 session->s_mds);
4284 } else {
4285 session->s_state = CEPH_MDS_SESSION_OPEN;
4286 renewed_caps(mdsc, session, 0);
4287 if (test_bit(CEPHFS_FEATURE_METRIC_COLLECT,
4288 &session->s_features))
4289 metric_schedule_delayed(&mdsc->metric);
4290 }
4291
4292 /*
4293 * The connection maybe broken and the session in client
4294 * side has been reinitialized, need to update the seq
4295 * anyway.
4296 */
4297 if (!session->s_seq && seq)
4298 session->s_seq = seq;
4299
4300 wake = 1;
4301 if (mdsc->stopping)
4302 __close_session(mdsc, session);
4303 break;
4304
4305 case CEPH_SESSION_RENEWCAPS:
4306 if (session->s_renew_seq == seq)
4307 renewed_caps(mdsc, session, 1);
4308 break;
4309
4310 case CEPH_SESSION_CLOSE:
4311 if (session->s_state == CEPH_MDS_SESSION_RECONNECTING)
4312 pr_info_client(cl, "mds%d reconnect denied\n",
4313 session->s_mds);
4314 session->s_state = CEPH_MDS_SESSION_CLOSED;
4315 cleanup_session_requests(mdsc, session);
4316 remove_session_caps(session);
4317 wake = 2; /* for good measure */
4318 wake_up_all(&mdsc->session_close_wq);
4319 break;
4320
4321 case CEPH_SESSION_STALE:
4322 pr_info_client(cl, "mds%d caps went stale, renewing\n",
4323 session->s_mds);
4324 atomic_inc(&session->s_cap_gen);
4325 session->s_cap_ttl = jiffies - 1;
4326 send_renew_caps(mdsc, session);
4327 break;
4328
4329 case CEPH_SESSION_RECALL_STATE:
4330 ceph_trim_caps(mdsc, session, le32_to_cpu(h->max_caps));
4331 break;
4332
4333 case CEPH_SESSION_FLUSHMSG:
4334 /* flush cap releases */
4335 spin_lock(&session->s_cap_lock);
4336 if (session->s_num_cap_releases)
4337 ceph_flush_session_cap_releases(mdsc, session);
4338 spin_unlock(&session->s_cap_lock);
4339
4340 send_flushmsg_ack(mdsc, session, seq);
4341 break;
4342
4343 case CEPH_SESSION_FORCE_RO:
4344 doutc(cl, "force_session_readonly %p\n", session);
4345 spin_lock(&session->s_cap_lock);
4346 session->s_readonly = true;
4347 spin_unlock(&session->s_cap_lock);
4348 wake_up_session_caps(session, FORCE_RO);
4349 break;
4350
4351 case CEPH_SESSION_REJECT:
4352 WARN_ON(session->s_state != CEPH_MDS_SESSION_OPENING);
4353 pr_info_client(cl, "mds%d rejected session\n",
4354 session->s_mds);
4355 session->s_state = CEPH_MDS_SESSION_REJECTED;
4356 cleanup_session_requests(mdsc, session);
4357 remove_session_caps(session);
4358 if (blocklisted)
4359 mdsc->fsc->blocklisted = true;
4360 wake = 2; /* for good measure */
4361 break;
4362
4363 default:
4364 pr_err_client(cl, "bad op %d mds%d\n", op, mds);
4365 WARN_ON(1);
4366 }
4367
4368 mutex_unlock(&session->s_mutex);
4369 if (wake) {
4370 mutex_lock(&mdsc->mutex);
4371 __wake_requests(mdsc, &session->s_waiting);
4372 if (wake == 2)
4373 kick_requests(mdsc, mds);
4374 mutex_unlock(&mdsc->mutex);
4375 }
4376 if (op == CEPH_SESSION_CLOSE)
4377 ceph_put_mds_session(session);
4378 return;
4379
4380bad:
4381 pr_err_client(cl, "corrupt message mds%d len %d\n", mds,
4382 (int)msg->front.iov_len);
4383 ceph_msg_dump(msg);
4384fail:
4385 for (i = 0; i < cap_auths_num; i++) {
4386 kfree(cap_auths[i].match.gids);
4387 kfree(cap_auths[i].match.path);
4388 kfree(cap_auths[i].match.fs_name);
4389 }
4390 kfree(cap_auths);
4391 return;
4392}
4393
4394void ceph_mdsc_release_dir_caps(struct ceph_mds_request *req)
4395{
4396 struct ceph_client *cl = req->r_mdsc->fsc->client;
4397 int dcaps;
4398
4399 dcaps = xchg(&req->r_dir_caps, 0);
4400 if (dcaps) {
4401 doutc(cl, "releasing r_dir_caps=%s\n", ceph_cap_string(dcaps));
4402 ceph_put_cap_refs(ceph_inode(req->r_parent), dcaps);
4403 }
4404}
4405
4406void ceph_mdsc_release_dir_caps_async(struct ceph_mds_request *req)
4407{
4408 struct ceph_client *cl = req->r_mdsc->fsc->client;
4409 int dcaps;
4410
4411 dcaps = xchg(&req->r_dir_caps, 0);
4412 if (dcaps) {
4413 doutc(cl, "releasing r_dir_caps=%s\n", ceph_cap_string(dcaps));
4414 ceph_put_cap_refs_async(ceph_inode(req->r_parent), dcaps);
4415 }
4416}
4417
4418/*
4419 * called under session->mutex.
4420 */
4421static void replay_unsafe_requests(struct ceph_mds_client *mdsc,
4422 struct ceph_mds_session *session)
4423{
4424 struct ceph_mds_request *req, *nreq;
4425 struct rb_node *p;
4426
4427 doutc(mdsc->fsc->client, "mds%d\n", session->s_mds);
4428
4429 mutex_lock(&mdsc->mutex);
4430 list_for_each_entry_safe(req, nreq, &session->s_unsafe, r_unsafe_item)
4431 __send_request(session, req, true);
4432
4433 /*
4434 * also re-send old requests when MDS enters reconnect stage. So that MDS
4435 * can process completed request in clientreplay stage.
4436 */
4437 p = rb_first(&mdsc->request_tree);
4438 while (p) {
4439 req = rb_entry(p, struct ceph_mds_request, r_node);
4440 p = rb_next(p);
4441 if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags))
4442 continue;
4443 if (req->r_attempts == 0)
4444 continue; /* only old requests */
4445 if (!req->r_session)
4446 continue;
4447 if (req->r_session->s_mds != session->s_mds)
4448 continue;
4449
4450 ceph_mdsc_release_dir_caps_async(req);
4451
4452 __send_request(session, req, true);
4453 }
4454 mutex_unlock(&mdsc->mutex);
4455}
4456
4457static int send_reconnect_partial(struct ceph_reconnect_state *recon_state)
4458{
4459 struct ceph_msg *reply;
4460 struct ceph_pagelist *_pagelist;
4461 struct page *page;
4462 __le32 *addr;
4463 int err = -ENOMEM;
4464
4465 if (!recon_state->allow_multi)
4466 return -ENOSPC;
4467
4468 /* can't handle message that contains both caps and realm */
4469 BUG_ON(!recon_state->nr_caps == !recon_state->nr_realms);
4470
4471 /* pre-allocate new pagelist */
4472 _pagelist = ceph_pagelist_alloc(GFP_NOFS);
4473 if (!_pagelist)
4474 return -ENOMEM;
4475
4476 reply = ceph_msg_new2(CEPH_MSG_CLIENT_RECONNECT, 0, 1, GFP_NOFS, false);
4477 if (!reply)
4478 goto fail_msg;
4479
4480 /* placeholder for nr_caps */
4481 err = ceph_pagelist_encode_32(_pagelist, 0);
4482 if (err < 0)
4483 goto fail;
4484
4485 if (recon_state->nr_caps) {
4486 /* currently encoding caps */
4487 err = ceph_pagelist_encode_32(recon_state->pagelist, 0);
4488 if (err)
4489 goto fail;
4490 } else {
4491 /* placeholder for nr_realms (currently encoding relams) */
4492 err = ceph_pagelist_encode_32(_pagelist, 0);
4493 if (err < 0)
4494 goto fail;
4495 }
4496
4497 err = ceph_pagelist_encode_8(recon_state->pagelist, 1);
4498 if (err)
4499 goto fail;
4500
4501 page = list_first_entry(&recon_state->pagelist->head, struct page, lru);
4502 addr = kmap_atomic(page);
4503 if (recon_state->nr_caps) {
4504 /* currently encoding caps */
4505 *addr = cpu_to_le32(recon_state->nr_caps);
4506 } else {
4507 /* currently encoding relams */
4508 *(addr + 1) = cpu_to_le32(recon_state->nr_realms);
4509 }
4510 kunmap_atomic(addr);
4511
4512 reply->hdr.version = cpu_to_le16(5);
4513 reply->hdr.compat_version = cpu_to_le16(4);
4514
4515 reply->hdr.data_len = cpu_to_le32(recon_state->pagelist->length);
4516 ceph_msg_data_add_pagelist(reply, recon_state->pagelist);
4517
4518 ceph_con_send(&recon_state->session->s_con, reply);
4519 ceph_pagelist_release(recon_state->pagelist);
4520
4521 recon_state->pagelist = _pagelist;
4522 recon_state->nr_caps = 0;
4523 recon_state->nr_realms = 0;
4524 recon_state->msg_version = 5;
4525 return 0;
4526fail:
4527 ceph_msg_put(reply);
4528fail_msg:
4529 ceph_pagelist_release(_pagelist);
4530 return err;
4531}
4532
4533static struct dentry* d_find_primary(struct inode *inode)
4534{
4535 struct dentry *alias, *dn = NULL;
4536
4537 if (hlist_empty(&inode->i_dentry))
4538 return NULL;
4539
4540 spin_lock(&inode->i_lock);
4541 if (hlist_empty(&inode->i_dentry))
4542 goto out_unlock;
4543
4544 if (S_ISDIR(inode->i_mode)) {
4545 alias = hlist_entry(inode->i_dentry.first, struct dentry, d_u.d_alias);
4546 if (!IS_ROOT(alias))
4547 dn = dget(alias);
4548 goto out_unlock;
4549 }
4550
4551 hlist_for_each_entry(alias, &inode->i_dentry, d_u.d_alias) {
4552 spin_lock(&alias->d_lock);
4553 if (!d_unhashed(alias) &&
4554 (ceph_dentry(alias)->flags & CEPH_DENTRY_PRIMARY_LINK)) {
4555 dn = dget_dlock(alias);
4556 }
4557 spin_unlock(&alias->d_lock);
4558 if (dn)
4559 break;
4560 }
4561out_unlock:
4562 spin_unlock(&inode->i_lock);
4563 return dn;
4564}
4565
4566/*
4567 * Encode information about a cap for a reconnect with the MDS.
4568 */
4569static int reconnect_caps_cb(struct inode *inode, int mds, void *arg)
4570{
4571 struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(inode->i_sb);
4572 struct ceph_client *cl = ceph_inode_to_client(inode);
4573 union {
4574 struct ceph_mds_cap_reconnect v2;
4575 struct ceph_mds_cap_reconnect_v1 v1;
4576 } rec;
4577 struct ceph_inode_info *ci = ceph_inode(inode);
4578 struct ceph_reconnect_state *recon_state = arg;
4579 struct ceph_pagelist *pagelist = recon_state->pagelist;
4580 struct dentry *dentry;
4581 struct ceph_cap *cap;
4582 char *path;
4583 int pathlen = 0, err;
4584 u64 pathbase;
4585 u64 snap_follows;
4586
4587 dentry = d_find_primary(inode);
4588 if (dentry) {
4589 /* set pathbase to parent dir when msg_version >= 2 */
4590 path = ceph_mdsc_build_path(mdsc, dentry, &pathlen, &pathbase,
4591 recon_state->msg_version >= 2);
4592 dput(dentry);
4593 if (IS_ERR(path)) {
4594 err = PTR_ERR(path);
4595 goto out_err;
4596 }
4597 } else {
4598 path = NULL;
4599 pathbase = 0;
4600 }
4601
4602 spin_lock(&ci->i_ceph_lock);
4603 cap = __get_cap_for_mds(ci, mds);
4604 if (!cap) {
4605 spin_unlock(&ci->i_ceph_lock);
4606 err = 0;
4607 goto out_err;
4608 }
4609 doutc(cl, " adding %p ino %llx.%llx cap %p %lld %s\n", inode,
4610 ceph_vinop(inode), cap, cap->cap_id,
4611 ceph_cap_string(cap->issued));
4612
4613 cap->seq = 0; /* reset cap seq */
4614 cap->issue_seq = 0; /* and issue_seq */
4615 cap->mseq = 0; /* and migrate_seq */
4616 cap->cap_gen = atomic_read(&cap->session->s_cap_gen);
4617
4618 /* These are lost when the session goes away */
4619 if (S_ISDIR(inode->i_mode)) {
4620 if (cap->issued & CEPH_CAP_DIR_CREATE) {
4621 ceph_put_string(rcu_dereference_raw(ci->i_cached_layout.pool_ns));
4622 memset(&ci->i_cached_layout, 0, sizeof(ci->i_cached_layout));
4623 }
4624 cap->issued &= ~CEPH_CAP_ANY_DIR_OPS;
4625 }
4626
4627 if (recon_state->msg_version >= 2) {
4628 rec.v2.cap_id = cpu_to_le64(cap->cap_id);
4629 rec.v2.wanted = cpu_to_le32(__ceph_caps_wanted(ci));
4630 rec.v2.issued = cpu_to_le32(cap->issued);
4631 rec.v2.snaprealm = cpu_to_le64(ci->i_snap_realm->ino);
4632 rec.v2.pathbase = cpu_to_le64(pathbase);
4633 rec.v2.flock_len = (__force __le32)
4634 ((ci->i_ceph_flags & CEPH_I_ERROR_FILELOCK) ? 0 : 1);
4635 } else {
4636 struct timespec64 ts;
4637
4638 rec.v1.cap_id = cpu_to_le64(cap->cap_id);
4639 rec.v1.wanted = cpu_to_le32(__ceph_caps_wanted(ci));
4640 rec.v1.issued = cpu_to_le32(cap->issued);
4641 rec.v1.size = cpu_to_le64(i_size_read(inode));
4642 ts = inode_get_mtime(inode);
4643 ceph_encode_timespec64(&rec.v1.mtime, &ts);
4644 ts = inode_get_atime(inode);
4645 ceph_encode_timespec64(&rec.v1.atime, &ts);
4646 rec.v1.snaprealm = cpu_to_le64(ci->i_snap_realm->ino);
4647 rec.v1.pathbase = cpu_to_le64(pathbase);
4648 }
4649
4650 if (list_empty(&ci->i_cap_snaps)) {
4651 snap_follows = ci->i_head_snapc ? ci->i_head_snapc->seq : 0;
4652 } else {
4653 struct ceph_cap_snap *capsnap =
4654 list_first_entry(&ci->i_cap_snaps,
4655 struct ceph_cap_snap, ci_item);
4656 snap_follows = capsnap->follows;
4657 }
4658 spin_unlock(&ci->i_ceph_lock);
4659
4660 if (recon_state->msg_version >= 2) {
4661 int num_fcntl_locks, num_flock_locks;
4662 struct ceph_filelock *flocks = NULL;
4663 size_t struct_len, total_len = sizeof(u64);
4664 u8 struct_v = 0;
4665
4666encode_again:
4667 if (rec.v2.flock_len) {
4668 ceph_count_locks(inode, &num_fcntl_locks, &num_flock_locks);
4669 } else {
4670 num_fcntl_locks = 0;
4671 num_flock_locks = 0;
4672 }
4673 if (num_fcntl_locks + num_flock_locks > 0) {
4674 flocks = kmalloc_array(num_fcntl_locks + num_flock_locks,
4675 sizeof(struct ceph_filelock),
4676 GFP_NOFS);
4677 if (!flocks) {
4678 err = -ENOMEM;
4679 goto out_err;
4680 }
4681 err = ceph_encode_locks_to_buffer(inode, flocks,
4682 num_fcntl_locks,
4683 num_flock_locks);
4684 if (err) {
4685 kfree(flocks);
4686 flocks = NULL;
4687 if (err == -ENOSPC)
4688 goto encode_again;
4689 goto out_err;
4690 }
4691 } else {
4692 kfree(flocks);
4693 flocks = NULL;
4694 }
4695
4696 if (recon_state->msg_version >= 3) {
4697 /* version, compat_version and struct_len */
4698 total_len += 2 * sizeof(u8) + sizeof(u32);
4699 struct_v = 2;
4700 }
4701 /*
4702 * number of encoded locks is stable, so copy to pagelist
4703 */
4704 struct_len = 2 * sizeof(u32) +
4705 (num_fcntl_locks + num_flock_locks) *
4706 sizeof(struct ceph_filelock);
4707 rec.v2.flock_len = cpu_to_le32(struct_len);
4708
4709 struct_len += sizeof(u32) + pathlen + sizeof(rec.v2);
4710
4711 if (struct_v >= 2)
4712 struct_len += sizeof(u64); /* snap_follows */
4713
4714 total_len += struct_len;
4715
4716 if (pagelist->length + total_len > RECONNECT_MAX_SIZE) {
4717 err = send_reconnect_partial(recon_state);
4718 if (err)
4719 goto out_freeflocks;
4720 pagelist = recon_state->pagelist;
4721 }
4722
4723 err = ceph_pagelist_reserve(pagelist, total_len);
4724 if (err)
4725 goto out_freeflocks;
4726
4727 ceph_pagelist_encode_64(pagelist, ceph_ino(inode));
4728 if (recon_state->msg_version >= 3) {
4729 ceph_pagelist_encode_8(pagelist, struct_v);
4730 ceph_pagelist_encode_8(pagelist, 1);
4731 ceph_pagelist_encode_32(pagelist, struct_len);
4732 }
4733 ceph_pagelist_encode_string(pagelist, path, pathlen);
4734 ceph_pagelist_append(pagelist, &rec, sizeof(rec.v2));
4735 ceph_locks_to_pagelist(flocks, pagelist,
4736 num_fcntl_locks, num_flock_locks);
4737 if (struct_v >= 2)
4738 ceph_pagelist_encode_64(pagelist, snap_follows);
4739out_freeflocks:
4740 kfree(flocks);
4741 } else {
4742 err = ceph_pagelist_reserve(pagelist,
4743 sizeof(u64) + sizeof(u32) +
4744 pathlen + sizeof(rec.v1));
4745 if (err)
4746 goto out_err;
4747
4748 ceph_pagelist_encode_64(pagelist, ceph_ino(inode));
4749 ceph_pagelist_encode_string(pagelist, path, pathlen);
4750 ceph_pagelist_append(pagelist, &rec, sizeof(rec.v1));
4751 }
4752
4753out_err:
4754 ceph_mdsc_free_path(path, pathlen);
4755 if (!err)
4756 recon_state->nr_caps++;
4757 return err;
4758}
4759
4760static int encode_snap_realms(struct ceph_mds_client *mdsc,
4761 struct ceph_reconnect_state *recon_state)
4762{
4763 struct rb_node *p;
4764 struct ceph_pagelist *pagelist = recon_state->pagelist;
4765 struct ceph_client *cl = mdsc->fsc->client;
4766 int err = 0;
4767
4768 if (recon_state->msg_version >= 4) {
4769 err = ceph_pagelist_encode_32(pagelist, mdsc->num_snap_realms);
4770 if (err < 0)
4771 goto fail;
4772 }
4773
4774 /*
4775 * snaprealms. we provide mds with the ino, seq (version), and
4776 * parent for all of our realms. If the mds has any newer info,
4777 * it will tell us.
4778 */
4779 for (p = rb_first(&mdsc->snap_realms); p; p = rb_next(p)) {
4780 struct ceph_snap_realm *realm =
4781 rb_entry(p, struct ceph_snap_realm, node);
4782 struct ceph_mds_snaprealm_reconnect sr_rec;
4783
4784 if (recon_state->msg_version >= 4) {
4785 size_t need = sizeof(u8) * 2 + sizeof(u32) +
4786 sizeof(sr_rec);
4787
4788 if (pagelist->length + need > RECONNECT_MAX_SIZE) {
4789 err = send_reconnect_partial(recon_state);
4790 if (err)
4791 goto fail;
4792 pagelist = recon_state->pagelist;
4793 }
4794
4795 err = ceph_pagelist_reserve(pagelist, need);
4796 if (err)
4797 goto fail;
4798
4799 ceph_pagelist_encode_8(pagelist, 1);
4800 ceph_pagelist_encode_8(pagelist, 1);
4801 ceph_pagelist_encode_32(pagelist, sizeof(sr_rec));
4802 }
4803
4804 doutc(cl, " adding snap realm %llx seq %lld parent %llx\n",
4805 realm->ino, realm->seq, realm->parent_ino);
4806 sr_rec.ino = cpu_to_le64(realm->ino);
4807 sr_rec.seq = cpu_to_le64(realm->seq);
4808 sr_rec.parent = cpu_to_le64(realm->parent_ino);
4809
4810 err = ceph_pagelist_append(pagelist, &sr_rec, sizeof(sr_rec));
4811 if (err)
4812 goto fail;
4813
4814 recon_state->nr_realms++;
4815 }
4816fail:
4817 return err;
4818}
4819
4820
4821/*
4822 * If an MDS fails and recovers, clients need to reconnect in order to
4823 * reestablish shared state. This includes all caps issued through
4824 * this session _and_ the snap_realm hierarchy. Because it's not
4825 * clear which snap realms the mds cares about, we send everything we
4826 * know about.. that ensures we'll then get any new info the
4827 * recovering MDS might have.
4828 *
4829 * This is a relatively heavyweight operation, but it's rare.
4830 */
4831static void send_mds_reconnect(struct ceph_mds_client *mdsc,
4832 struct ceph_mds_session *session)
4833{
4834 struct ceph_client *cl = mdsc->fsc->client;
4835 struct ceph_msg *reply;
4836 int mds = session->s_mds;
4837 int err = -ENOMEM;
4838 struct ceph_reconnect_state recon_state = {
4839 .session = session,
4840 };
4841 LIST_HEAD(dispose);
4842
4843 pr_info_client(cl, "mds%d reconnect start\n", mds);
4844
4845 recon_state.pagelist = ceph_pagelist_alloc(GFP_NOFS);
4846 if (!recon_state.pagelist)
4847 goto fail_nopagelist;
4848
4849 reply = ceph_msg_new2(CEPH_MSG_CLIENT_RECONNECT, 0, 1, GFP_NOFS, false);
4850 if (!reply)
4851 goto fail_nomsg;
4852
4853 xa_destroy(&session->s_delegated_inos);
4854
4855 mutex_lock(&session->s_mutex);
4856 session->s_state = CEPH_MDS_SESSION_RECONNECTING;
4857 session->s_seq = 0;
4858
4859 doutc(cl, "session %p state %s\n", session,
4860 ceph_session_state_name(session->s_state));
4861
4862 atomic_inc(&session->s_cap_gen);
4863
4864 spin_lock(&session->s_cap_lock);
4865 /* don't know if session is readonly */
4866 session->s_readonly = 0;
4867 /*
4868 * notify __ceph_remove_cap() that we are composing cap reconnect.
4869 * If a cap get released before being added to the cap reconnect,
4870 * __ceph_remove_cap() should skip queuing cap release.
4871 */
4872 session->s_cap_reconnect = 1;
4873 /* drop old cap expires; we're about to reestablish that state */
4874 detach_cap_releases(session, &dispose);
4875 spin_unlock(&session->s_cap_lock);
4876 dispose_cap_releases(mdsc, &dispose);
4877
4878 /* trim unused caps to reduce MDS's cache rejoin time */
4879 if (mdsc->fsc->sb->s_root)
4880 shrink_dcache_parent(mdsc->fsc->sb->s_root);
4881
4882 ceph_con_close(&session->s_con);
4883 ceph_con_open(&session->s_con,
4884 CEPH_ENTITY_TYPE_MDS, mds,
4885 ceph_mdsmap_get_addr(mdsc->mdsmap, mds));
4886
4887 /* replay unsafe requests */
4888 replay_unsafe_requests(mdsc, session);
4889
4890 ceph_early_kick_flushing_caps(mdsc, session);
4891
4892 down_read(&mdsc->snap_rwsem);
4893
4894 /* placeholder for nr_caps */
4895 err = ceph_pagelist_encode_32(recon_state.pagelist, 0);
4896 if (err)
4897 goto fail;
4898
4899 if (test_bit(CEPHFS_FEATURE_MULTI_RECONNECT, &session->s_features)) {
4900 recon_state.msg_version = 3;
4901 recon_state.allow_multi = true;
4902 } else if (session->s_con.peer_features & CEPH_FEATURE_MDSENC) {
4903 recon_state.msg_version = 3;
4904 } else {
4905 recon_state.msg_version = 2;
4906 }
4907 /* traverse this session's caps */
4908 err = ceph_iterate_session_caps(session, reconnect_caps_cb, &recon_state);
4909
4910 spin_lock(&session->s_cap_lock);
4911 session->s_cap_reconnect = 0;
4912 spin_unlock(&session->s_cap_lock);
4913
4914 if (err < 0)
4915 goto fail;
4916
4917 /* check if all realms can be encoded into current message */
4918 if (mdsc->num_snap_realms) {
4919 size_t total_len =
4920 recon_state.pagelist->length +
4921 mdsc->num_snap_realms *
4922 sizeof(struct ceph_mds_snaprealm_reconnect);
4923 if (recon_state.msg_version >= 4) {
4924 /* number of realms */
4925 total_len += sizeof(u32);
4926 /* version, compat_version and struct_len */
4927 total_len += mdsc->num_snap_realms *
4928 (2 * sizeof(u8) + sizeof(u32));
4929 }
4930 if (total_len > RECONNECT_MAX_SIZE) {
4931 if (!recon_state.allow_multi) {
4932 err = -ENOSPC;
4933 goto fail;
4934 }
4935 if (recon_state.nr_caps) {
4936 err = send_reconnect_partial(&recon_state);
4937 if (err)
4938 goto fail;
4939 }
4940 recon_state.msg_version = 5;
4941 }
4942 }
4943
4944 err = encode_snap_realms(mdsc, &recon_state);
4945 if (err < 0)
4946 goto fail;
4947
4948 if (recon_state.msg_version >= 5) {
4949 err = ceph_pagelist_encode_8(recon_state.pagelist, 0);
4950 if (err < 0)
4951 goto fail;
4952 }
4953
4954 if (recon_state.nr_caps || recon_state.nr_realms) {
4955 struct page *page =
4956 list_first_entry(&recon_state.pagelist->head,
4957 struct page, lru);
4958 __le32 *addr = kmap_atomic(page);
4959 if (recon_state.nr_caps) {
4960 WARN_ON(recon_state.nr_realms != mdsc->num_snap_realms);
4961 *addr = cpu_to_le32(recon_state.nr_caps);
4962 } else if (recon_state.msg_version >= 4) {
4963 *(addr + 1) = cpu_to_le32(recon_state.nr_realms);
4964 }
4965 kunmap_atomic(addr);
4966 }
4967
4968 reply->hdr.version = cpu_to_le16(recon_state.msg_version);
4969 if (recon_state.msg_version >= 4)
4970 reply->hdr.compat_version = cpu_to_le16(4);
4971
4972 reply->hdr.data_len = cpu_to_le32(recon_state.pagelist->length);
4973 ceph_msg_data_add_pagelist(reply, recon_state.pagelist);
4974
4975 ceph_con_send(&session->s_con, reply);
4976
4977 mutex_unlock(&session->s_mutex);
4978
4979 mutex_lock(&mdsc->mutex);
4980 __wake_requests(mdsc, &session->s_waiting);
4981 mutex_unlock(&mdsc->mutex);
4982
4983 up_read(&mdsc->snap_rwsem);
4984 ceph_pagelist_release(recon_state.pagelist);
4985 return;
4986
4987fail:
4988 ceph_msg_put(reply);
4989 up_read(&mdsc->snap_rwsem);
4990 mutex_unlock(&session->s_mutex);
4991fail_nomsg:
4992 ceph_pagelist_release(recon_state.pagelist);
4993fail_nopagelist:
4994 pr_err_client(cl, "error %d preparing reconnect for mds%d\n",
4995 err, mds);
4996 return;
4997}
4998
4999
5000/*
5001 * compare old and new mdsmaps, kicking requests
5002 * and closing out old connections as necessary
5003 *
5004 * called under mdsc->mutex.
5005 */
5006static void check_new_map(struct ceph_mds_client *mdsc,
5007 struct ceph_mdsmap *newmap,
5008 struct ceph_mdsmap *oldmap)
5009{
5010 int i, j, err;
5011 int oldstate, newstate;
5012 struct ceph_mds_session *s;
5013 unsigned long targets[DIV_ROUND_UP(CEPH_MAX_MDS, sizeof(unsigned long))] = {0};
5014 struct ceph_client *cl = mdsc->fsc->client;
5015
5016 doutc(cl, "new %u old %u\n", newmap->m_epoch, oldmap->m_epoch);
5017
5018 if (newmap->m_info) {
5019 for (i = 0; i < newmap->possible_max_rank; i++) {
5020 for (j = 0; j < newmap->m_info[i].num_export_targets; j++)
5021 set_bit(newmap->m_info[i].export_targets[j], targets);
5022 }
5023 }
5024
5025 for (i = 0; i < oldmap->possible_max_rank && i < mdsc->max_sessions; i++) {
5026 if (!mdsc->sessions[i])
5027 continue;
5028 s = mdsc->sessions[i];
5029 oldstate = ceph_mdsmap_get_state(oldmap, i);
5030 newstate = ceph_mdsmap_get_state(newmap, i);
5031
5032 doutc(cl, "mds%d state %s%s -> %s%s (session %s)\n",
5033 i, ceph_mds_state_name(oldstate),
5034 ceph_mdsmap_is_laggy(oldmap, i) ? " (laggy)" : "",
5035 ceph_mds_state_name(newstate),
5036 ceph_mdsmap_is_laggy(newmap, i) ? " (laggy)" : "",
5037 ceph_session_state_name(s->s_state));
5038
5039 if (i >= newmap->possible_max_rank) {
5040 /* force close session for stopped mds */
5041 ceph_get_mds_session(s);
5042 __unregister_session(mdsc, s);
5043 __wake_requests(mdsc, &s->s_waiting);
5044 mutex_unlock(&mdsc->mutex);
5045
5046 mutex_lock(&s->s_mutex);
5047 cleanup_session_requests(mdsc, s);
5048 remove_session_caps(s);
5049 mutex_unlock(&s->s_mutex);
5050
5051 ceph_put_mds_session(s);
5052
5053 mutex_lock(&mdsc->mutex);
5054 kick_requests(mdsc, i);
5055 continue;
5056 }
5057
5058 if (memcmp(ceph_mdsmap_get_addr(oldmap, i),
5059 ceph_mdsmap_get_addr(newmap, i),
5060 sizeof(struct ceph_entity_addr))) {
5061 /* just close it */
5062 mutex_unlock(&mdsc->mutex);
5063 mutex_lock(&s->s_mutex);
5064 mutex_lock(&mdsc->mutex);
5065 ceph_con_close(&s->s_con);
5066 mutex_unlock(&s->s_mutex);
5067 s->s_state = CEPH_MDS_SESSION_RESTARTING;
5068 } else if (oldstate == newstate) {
5069 continue; /* nothing new with this mds */
5070 }
5071
5072 /*
5073 * send reconnect?
5074 */
5075 if (s->s_state == CEPH_MDS_SESSION_RESTARTING &&
5076 newstate >= CEPH_MDS_STATE_RECONNECT) {
5077 mutex_unlock(&mdsc->mutex);
5078 clear_bit(i, targets);
5079 send_mds_reconnect(mdsc, s);
5080 mutex_lock(&mdsc->mutex);
5081 }
5082
5083 /*
5084 * kick request on any mds that has gone active.
5085 */
5086 if (oldstate < CEPH_MDS_STATE_ACTIVE &&
5087 newstate >= CEPH_MDS_STATE_ACTIVE) {
5088 if (oldstate != CEPH_MDS_STATE_CREATING &&
5089 oldstate != CEPH_MDS_STATE_STARTING)
5090 pr_info_client(cl, "mds%d recovery completed\n",
5091 s->s_mds);
5092 kick_requests(mdsc, i);
5093 mutex_unlock(&mdsc->mutex);
5094 mutex_lock(&s->s_mutex);
5095 mutex_lock(&mdsc->mutex);
5096 ceph_kick_flushing_caps(mdsc, s);
5097 mutex_unlock(&s->s_mutex);
5098 wake_up_session_caps(s, RECONNECT);
5099 }
5100 }
5101
5102 /*
5103 * Only open and reconnect sessions that don't exist yet.
5104 */
5105 for (i = 0; i < newmap->possible_max_rank; i++) {
5106 /*
5107 * In case the import MDS is crashed just after
5108 * the EImportStart journal is flushed, so when
5109 * a standby MDS takes over it and is replaying
5110 * the EImportStart journal the new MDS daemon
5111 * will wait the client to reconnect it, but the
5112 * client may never register/open the session yet.
5113 *
5114 * Will try to reconnect that MDS daemon if the
5115 * rank number is in the export targets array and
5116 * is the up:reconnect state.
5117 */
5118 newstate = ceph_mdsmap_get_state(newmap, i);
5119 if (!test_bit(i, targets) || newstate != CEPH_MDS_STATE_RECONNECT)
5120 continue;
5121
5122 /*
5123 * The session maybe registered and opened by some
5124 * requests which were choosing random MDSes during
5125 * the mdsc->mutex's unlock/lock gap below in rare
5126 * case. But the related MDS daemon will just queue
5127 * that requests and be still waiting for the client's
5128 * reconnection request in up:reconnect state.
5129 */
5130 s = __ceph_lookup_mds_session(mdsc, i);
5131 if (likely(!s)) {
5132 s = __open_export_target_session(mdsc, i);
5133 if (IS_ERR(s)) {
5134 err = PTR_ERR(s);
5135 pr_err_client(cl,
5136 "failed to open export target session, err %d\n",
5137 err);
5138 continue;
5139 }
5140 }
5141 doutc(cl, "send reconnect to export target mds.%d\n", i);
5142 mutex_unlock(&mdsc->mutex);
5143 send_mds_reconnect(mdsc, s);
5144 ceph_put_mds_session(s);
5145 mutex_lock(&mdsc->mutex);
5146 }
5147
5148 for (i = 0; i < newmap->possible_max_rank && i < mdsc->max_sessions; i++) {
5149 s = mdsc->sessions[i];
5150 if (!s)
5151 continue;
5152 if (!ceph_mdsmap_is_laggy(newmap, i))
5153 continue;
5154 if (s->s_state == CEPH_MDS_SESSION_OPEN ||
5155 s->s_state == CEPH_MDS_SESSION_HUNG ||
5156 s->s_state == CEPH_MDS_SESSION_CLOSING) {
5157 doutc(cl, " connecting to export targets of laggy mds%d\n", i);
5158 __open_export_target_sessions(mdsc, s);
5159 }
5160 }
5161}
5162
5163
5164
5165/*
5166 * leases
5167 */
5168
5169/*
5170 * caller must hold session s_mutex, dentry->d_lock
5171 */
5172void __ceph_mdsc_drop_dentry_lease(struct dentry *dentry)
5173{
5174 struct ceph_dentry_info *di = ceph_dentry(dentry);
5175
5176 ceph_put_mds_session(di->lease_session);
5177 di->lease_session = NULL;
5178}
5179
5180static void handle_lease(struct ceph_mds_client *mdsc,
5181 struct ceph_mds_session *session,
5182 struct ceph_msg *msg)
5183{
5184 struct ceph_client *cl = mdsc->fsc->client;
5185 struct super_block *sb = mdsc->fsc->sb;
5186 struct inode *inode;
5187 struct dentry *parent, *dentry;
5188 struct ceph_dentry_info *di;
5189 int mds = session->s_mds;
5190 struct ceph_mds_lease *h = msg->front.iov_base;
5191 u32 seq;
5192 struct ceph_vino vino;
5193 struct qstr dname;
5194 int release = 0;
5195
5196 doutc(cl, "from mds%d\n", mds);
5197
5198 if (!ceph_inc_mds_stopping_blocker(mdsc, session))
5199 return;
5200
5201 /* decode */
5202 if (msg->front.iov_len < sizeof(*h) + sizeof(u32))
5203 goto bad;
5204 vino.ino = le64_to_cpu(h->ino);
5205 vino.snap = CEPH_NOSNAP;
5206 seq = le32_to_cpu(h->seq);
5207 dname.len = get_unaligned_le32(h + 1);
5208 if (msg->front.iov_len < sizeof(*h) + sizeof(u32) + dname.len)
5209 goto bad;
5210 dname.name = (void *)(h + 1) + sizeof(u32);
5211
5212 /* lookup inode */
5213 inode = ceph_find_inode(sb, vino);
5214 doutc(cl, "%s, ino %llx %p %.*s\n", ceph_lease_op_name(h->action),
5215 vino.ino, inode, dname.len, dname.name);
5216
5217 mutex_lock(&session->s_mutex);
5218 if (!inode) {
5219 doutc(cl, "no inode %llx\n", vino.ino);
5220 goto release;
5221 }
5222
5223 /* dentry */
5224 parent = d_find_alias(inode);
5225 if (!parent) {
5226 doutc(cl, "no parent dentry on inode %p\n", inode);
5227 WARN_ON(1);
5228 goto release; /* hrm... */
5229 }
5230 dname.hash = full_name_hash(parent, dname.name, dname.len);
5231 dentry = d_lookup(parent, &dname);
5232 dput(parent);
5233 if (!dentry)
5234 goto release;
5235
5236 spin_lock(&dentry->d_lock);
5237 di = ceph_dentry(dentry);
5238 switch (h->action) {
5239 case CEPH_MDS_LEASE_REVOKE:
5240 if (di->lease_session == session) {
5241 if (ceph_seq_cmp(di->lease_seq, seq) > 0)
5242 h->seq = cpu_to_le32(di->lease_seq);
5243 __ceph_mdsc_drop_dentry_lease(dentry);
5244 }
5245 release = 1;
5246 break;
5247
5248 case CEPH_MDS_LEASE_RENEW:
5249 if (di->lease_session == session &&
5250 di->lease_gen == atomic_read(&session->s_cap_gen) &&
5251 di->lease_renew_from &&
5252 di->lease_renew_after == 0) {
5253 unsigned long duration =
5254 msecs_to_jiffies(le32_to_cpu(h->duration_ms));
5255
5256 di->lease_seq = seq;
5257 di->time = di->lease_renew_from + duration;
5258 di->lease_renew_after = di->lease_renew_from +
5259 (duration >> 1);
5260 di->lease_renew_from = 0;
5261 }
5262 break;
5263 }
5264 spin_unlock(&dentry->d_lock);
5265 dput(dentry);
5266
5267 if (!release)
5268 goto out;
5269
5270release:
5271 /* let's just reuse the same message */
5272 h->action = CEPH_MDS_LEASE_REVOKE_ACK;
5273 ceph_msg_get(msg);
5274 ceph_con_send(&session->s_con, msg);
5275
5276out:
5277 mutex_unlock(&session->s_mutex);
5278 iput(inode);
5279
5280 ceph_dec_mds_stopping_blocker(mdsc);
5281 return;
5282
5283bad:
5284 ceph_dec_mds_stopping_blocker(mdsc);
5285
5286 pr_err_client(cl, "corrupt lease message\n");
5287 ceph_msg_dump(msg);
5288}
5289
5290void ceph_mdsc_lease_send_msg(struct ceph_mds_session *session,
5291 struct dentry *dentry, char action,
5292 u32 seq)
5293{
5294 struct ceph_client *cl = session->s_mdsc->fsc->client;
5295 struct ceph_msg *msg;
5296 struct ceph_mds_lease *lease;
5297 struct inode *dir;
5298 int len = sizeof(*lease) + sizeof(u32) + NAME_MAX;
5299
5300 doutc(cl, "identry %p %s to mds%d\n", dentry, ceph_lease_op_name(action),
5301 session->s_mds);
5302
5303 msg = ceph_msg_new(CEPH_MSG_CLIENT_LEASE, len, GFP_NOFS, false);
5304 if (!msg)
5305 return;
5306 lease = msg->front.iov_base;
5307 lease->action = action;
5308 lease->seq = cpu_to_le32(seq);
5309
5310 spin_lock(&dentry->d_lock);
5311 dir = d_inode(dentry->d_parent);
5312 lease->ino = cpu_to_le64(ceph_ino(dir));
5313 lease->first = lease->last = cpu_to_le64(ceph_snap(dir));
5314
5315 put_unaligned_le32(dentry->d_name.len, lease + 1);
5316 memcpy((void *)(lease + 1) + 4,
5317 dentry->d_name.name, dentry->d_name.len);
5318 spin_unlock(&dentry->d_lock);
5319
5320 ceph_con_send(&session->s_con, msg);
5321}
5322
5323/*
5324 * lock unlock the session, to wait ongoing session activities
5325 */
5326static void lock_unlock_session(struct ceph_mds_session *s)
5327{
5328 mutex_lock(&s->s_mutex);
5329 mutex_unlock(&s->s_mutex);
5330}
5331
5332static void maybe_recover_session(struct ceph_mds_client *mdsc)
5333{
5334 struct ceph_client *cl = mdsc->fsc->client;
5335 struct ceph_fs_client *fsc = mdsc->fsc;
5336
5337 if (!ceph_test_mount_opt(fsc, CLEANRECOVER))
5338 return;
5339
5340 if (READ_ONCE(fsc->mount_state) != CEPH_MOUNT_MOUNTED)
5341 return;
5342
5343 if (!READ_ONCE(fsc->blocklisted))
5344 return;
5345
5346 pr_info_client(cl, "auto reconnect after blocklisted\n");
5347 ceph_force_reconnect(fsc->sb);
5348}
5349
5350bool check_session_state(struct ceph_mds_session *s)
5351{
5352 struct ceph_client *cl = s->s_mdsc->fsc->client;
5353
5354 switch (s->s_state) {
5355 case CEPH_MDS_SESSION_OPEN:
5356 if (s->s_ttl && time_after(jiffies, s->s_ttl)) {
5357 s->s_state = CEPH_MDS_SESSION_HUNG;
5358 pr_info_client(cl, "mds%d hung\n", s->s_mds);
5359 }
5360 break;
5361 case CEPH_MDS_SESSION_CLOSING:
5362 case CEPH_MDS_SESSION_NEW:
5363 case CEPH_MDS_SESSION_RESTARTING:
5364 case CEPH_MDS_SESSION_CLOSED:
5365 case CEPH_MDS_SESSION_REJECTED:
5366 return false;
5367 }
5368
5369 return true;
5370}
5371
5372/*
5373 * If the sequence is incremented while we're waiting on a REQUEST_CLOSE reply,
5374 * then we need to retransmit that request.
5375 */
5376void inc_session_sequence(struct ceph_mds_session *s)
5377{
5378 struct ceph_client *cl = s->s_mdsc->fsc->client;
5379
5380 lockdep_assert_held(&s->s_mutex);
5381
5382 s->s_seq++;
5383
5384 if (s->s_state == CEPH_MDS_SESSION_CLOSING) {
5385 int ret;
5386
5387 doutc(cl, "resending session close request for mds%d\n", s->s_mds);
5388 ret = request_close_session(s);
5389 if (ret < 0)
5390 pr_err_client(cl, "unable to close session to mds%d: %d\n",
5391 s->s_mds, ret);
5392 }
5393}
5394
5395/*
5396 * delayed work -- periodically trim expired leases, renew caps with mds. If
5397 * the @delay parameter is set to 0 or if it's more than 5 secs, the default
5398 * workqueue delay value of 5 secs will be used.
5399 */
5400static void schedule_delayed(struct ceph_mds_client *mdsc, unsigned long delay)
5401{
5402 unsigned long max_delay = HZ * 5;
5403
5404 /* 5 secs default delay */
5405 if (!delay || (delay > max_delay))
5406 delay = max_delay;
5407 schedule_delayed_work(&mdsc->delayed_work,
5408 round_jiffies_relative(delay));
5409}
5410
5411static void delayed_work(struct work_struct *work)
5412{
5413 struct ceph_mds_client *mdsc =
5414 container_of(work, struct ceph_mds_client, delayed_work.work);
5415 unsigned long delay;
5416 int renew_interval;
5417 int renew_caps;
5418 int i;
5419
5420 doutc(mdsc->fsc->client, "mdsc delayed_work\n");
5421
5422 if (mdsc->stopping >= CEPH_MDSC_STOPPING_FLUSHED)
5423 return;
5424
5425 mutex_lock(&mdsc->mutex);
5426 renew_interval = mdsc->mdsmap->m_session_timeout >> 2;
5427 renew_caps = time_after_eq(jiffies, HZ*renew_interval +
5428 mdsc->last_renew_caps);
5429 if (renew_caps)
5430 mdsc->last_renew_caps = jiffies;
5431
5432 for (i = 0; i < mdsc->max_sessions; i++) {
5433 struct ceph_mds_session *s = __ceph_lookup_mds_session(mdsc, i);
5434 if (!s)
5435 continue;
5436
5437 if (!check_session_state(s)) {
5438 ceph_put_mds_session(s);
5439 continue;
5440 }
5441 mutex_unlock(&mdsc->mutex);
5442
5443 ceph_flush_session_cap_releases(mdsc, s);
5444
5445 mutex_lock(&s->s_mutex);
5446 if (renew_caps)
5447 send_renew_caps(mdsc, s);
5448 else
5449 ceph_con_keepalive(&s->s_con);
5450 if (s->s_state == CEPH_MDS_SESSION_OPEN ||
5451 s->s_state == CEPH_MDS_SESSION_HUNG)
5452 ceph_send_cap_releases(mdsc, s);
5453 mutex_unlock(&s->s_mutex);
5454 ceph_put_mds_session(s);
5455
5456 mutex_lock(&mdsc->mutex);
5457 }
5458 mutex_unlock(&mdsc->mutex);
5459
5460 delay = ceph_check_delayed_caps(mdsc);
5461
5462 ceph_queue_cap_reclaim_work(mdsc);
5463
5464 ceph_trim_snapid_map(mdsc);
5465
5466 maybe_recover_session(mdsc);
5467
5468 schedule_delayed(mdsc, delay);
5469}
5470
5471int ceph_mdsc_init(struct ceph_fs_client *fsc)
5472
5473{
5474 struct ceph_mds_client *mdsc;
5475 int err;
5476
5477 mdsc = kzalloc(sizeof(struct ceph_mds_client), GFP_NOFS);
5478 if (!mdsc)
5479 return -ENOMEM;
5480 mdsc->fsc = fsc;
5481 mutex_init(&mdsc->mutex);
5482 mdsc->mdsmap = kzalloc(sizeof(*mdsc->mdsmap), GFP_NOFS);
5483 if (!mdsc->mdsmap) {
5484 err = -ENOMEM;
5485 goto err_mdsc;
5486 }
5487
5488 init_completion(&mdsc->safe_umount_waiters);
5489 spin_lock_init(&mdsc->stopping_lock);
5490 atomic_set(&mdsc->stopping_blockers, 0);
5491 init_completion(&mdsc->stopping_waiter);
5492 atomic64_set(&mdsc->dirty_folios, 0);
5493 init_waitqueue_head(&mdsc->flush_end_wq);
5494 init_waitqueue_head(&mdsc->session_close_wq);
5495 INIT_LIST_HEAD(&mdsc->waiting_for_map);
5496 mdsc->quotarealms_inodes = RB_ROOT;
5497 mutex_init(&mdsc->quotarealms_inodes_mutex);
5498 init_rwsem(&mdsc->snap_rwsem);
5499 mdsc->snap_realms = RB_ROOT;
5500 INIT_LIST_HEAD(&mdsc->snap_empty);
5501 spin_lock_init(&mdsc->snap_empty_lock);
5502 mdsc->request_tree = RB_ROOT;
5503 INIT_DELAYED_WORK(&mdsc->delayed_work, delayed_work);
5504 mdsc->last_renew_caps = jiffies;
5505 INIT_LIST_HEAD(&mdsc->cap_delay_list);
5506#ifdef CONFIG_DEBUG_FS
5507 INIT_LIST_HEAD(&mdsc->cap_wait_list);
5508#endif
5509 spin_lock_init(&mdsc->cap_delay_lock);
5510 INIT_LIST_HEAD(&mdsc->cap_unlink_delay_list);
5511 INIT_LIST_HEAD(&mdsc->snap_flush_list);
5512 spin_lock_init(&mdsc->snap_flush_lock);
5513 mdsc->last_cap_flush_tid = 1;
5514 INIT_LIST_HEAD(&mdsc->cap_flush_list);
5515 INIT_LIST_HEAD(&mdsc->cap_dirty_migrating);
5516 spin_lock_init(&mdsc->cap_dirty_lock);
5517 init_waitqueue_head(&mdsc->cap_flushing_wq);
5518 INIT_WORK(&mdsc->cap_reclaim_work, ceph_cap_reclaim_work);
5519 INIT_WORK(&mdsc->cap_unlink_work, ceph_cap_unlink_work);
5520 err = ceph_metric_init(&mdsc->metric);
5521 if (err)
5522 goto err_mdsmap;
5523
5524 spin_lock_init(&mdsc->dentry_list_lock);
5525 INIT_LIST_HEAD(&mdsc->dentry_leases);
5526 INIT_LIST_HEAD(&mdsc->dentry_dir_leases);
5527
5528 ceph_caps_init(mdsc);
5529 ceph_adjust_caps_max_min(mdsc, fsc->mount_options);
5530
5531 spin_lock_init(&mdsc->snapid_map_lock);
5532 mdsc->snapid_map_tree = RB_ROOT;
5533 INIT_LIST_HEAD(&mdsc->snapid_map_lru);
5534
5535 init_rwsem(&mdsc->pool_perm_rwsem);
5536 mdsc->pool_perm_tree = RB_ROOT;
5537
5538 strscpy(mdsc->nodename, utsname()->nodename,
5539 sizeof(mdsc->nodename));
5540
5541 fsc->mdsc = mdsc;
5542 return 0;
5543
5544err_mdsmap:
5545 kfree(mdsc->mdsmap);
5546err_mdsc:
5547 kfree(mdsc);
5548 return err;
5549}
5550
5551/*
5552 * Wait for safe replies on open mds requests. If we time out, drop
5553 * all requests from the tree to avoid dangling dentry refs.
5554 */
5555static void wait_requests(struct ceph_mds_client *mdsc)
5556{
5557 struct ceph_client *cl = mdsc->fsc->client;
5558 struct ceph_options *opts = mdsc->fsc->client->options;
5559 struct ceph_mds_request *req;
5560
5561 mutex_lock(&mdsc->mutex);
5562 if (__get_oldest_req(mdsc)) {
5563 mutex_unlock(&mdsc->mutex);
5564
5565 doutc(cl, "waiting for requests\n");
5566 wait_for_completion_timeout(&mdsc->safe_umount_waiters,
5567 ceph_timeout_jiffies(opts->mount_timeout));
5568
5569 /* tear down remaining requests */
5570 mutex_lock(&mdsc->mutex);
5571 while ((req = __get_oldest_req(mdsc))) {
5572 doutc(cl, "timed out on tid %llu\n", req->r_tid);
5573 list_del_init(&req->r_wait);
5574 __unregister_request(mdsc, req);
5575 }
5576 }
5577 mutex_unlock(&mdsc->mutex);
5578 doutc(cl, "done\n");
5579}
5580
5581void send_flush_mdlog(struct ceph_mds_session *s)
5582{
5583 struct ceph_client *cl = s->s_mdsc->fsc->client;
5584 struct ceph_msg *msg;
5585
5586 /*
5587 * Pre-luminous MDS crashes when it sees an unknown session request
5588 */
5589 if (!CEPH_HAVE_FEATURE(s->s_con.peer_features, SERVER_LUMINOUS))
5590 return;
5591
5592 mutex_lock(&s->s_mutex);
5593 doutc(cl, "request mdlog flush to mds%d (%s)s seq %lld\n",
5594 s->s_mds, ceph_session_state_name(s->s_state), s->s_seq);
5595 msg = ceph_create_session_msg(CEPH_SESSION_REQUEST_FLUSH_MDLOG,
5596 s->s_seq);
5597 if (!msg) {
5598 pr_err_client(cl, "failed to request mdlog flush to mds%d (%s) seq %lld\n",
5599 s->s_mds, ceph_session_state_name(s->s_state), s->s_seq);
5600 } else {
5601 ceph_con_send(&s->s_con, msg);
5602 }
5603 mutex_unlock(&s->s_mutex);
5604}
5605
5606static int ceph_mds_auth_match(struct ceph_mds_client *mdsc,
5607 struct ceph_mds_cap_auth *auth,
5608 const struct cred *cred,
5609 char *tpath)
5610{
5611 u32 caller_uid = from_kuid(&init_user_ns, cred->fsuid);
5612 u32 caller_gid = from_kgid(&init_user_ns, cred->fsgid);
5613 struct ceph_client *cl = mdsc->fsc->client;
5614 const char *spath = mdsc->fsc->mount_options->server_path;
5615 bool gid_matched = false;
5616 u32 gid, tlen, len;
5617 int i, j;
5618
5619 doutc(cl, "match.uid %lld\n", auth->match.uid);
5620 if (auth->match.uid != MDS_AUTH_UID_ANY) {
5621 if (auth->match.uid != caller_uid)
5622 return 0;
5623 if (auth->match.num_gids) {
5624 for (i = 0; i < auth->match.num_gids; i++) {
5625 if (caller_gid == auth->match.gids[i])
5626 gid_matched = true;
5627 }
5628 if (!gid_matched && cred->group_info->ngroups) {
5629 for (i = 0; i < cred->group_info->ngroups; i++) {
5630 gid = from_kgid(&init_user_ns,
5631 cred->group_info->gid[i]);
5632 for (j = 0; j < auth->match.num_gids; j++) {
5633 if (gid == auth->match.gids[j]) {
5634 gid_matched = true;
5635 break;
5636 }
5637 }
5638 if (gid_matched)
5639 break;
5640 }
5641 }
5642 if (!gid_matched)
5643 return 0;
5644 }
5645 }
5646
5647 /* path match */
5648 if (auth->match.path) {
5649 if (!tpath)
5650 return 0;
5651
5652 tlen = strlen(tpath);
5653 len = strlen(auth->match.path);
5654 if (len) {
5655 char *_tpath = tpath;
5656 bool free_tpath = false;
5657 int m, n;
5658
5659 doutc(cl, "server path %s, tpath %s, match.path %s\n",
5660 spath, tpath, auth->match.path);
5661 if (spath && (m = strlen(spath)) != 1) {
5662 /* mount path + '/' + tpath + an extra space */
5663 n = m + 1 + tlen + 1;
5664 _tpath = kmalloc(n, GFP_NOFS);
5665 if (!_tpath)
5666 return -ENOMEM;
5667 /* remove the leading '/' */
5668 snprintf(_tpath, n, "%s/%s", spath + 1, tpath);
5669 free_tpath = true;
5670 tlen = strlen(_tpath);
5671 }
5672
5673 /*
5674 * Please note the tailing '/' for match.path has already
5675 * been removed when parsing.
5676 *
5677 * Remove the tailing '/' for the target path.
5678 */
5679 while (tlen && _tpath[tlen - 1] == '/') {
5680 _tpath[tlen - 1] = '\0';
5681 tlen -= 1;
5682 }
5683 doutc(cl, "_tpath %s\n", _tpath);
5684
5685 /*
5686 * In case first == _tpath && tlen == len:
5687 * match.path=/foo --> /foo _path=/foo --> match
5688 * match.path=/foo/ --> /foo _path=/foo --> match
5689 *
5690 * In case first == _tmatch.path && tlen > len:
5691 * match.path=/foo/ --> /foo _path=/foo/ --> match
5692 * match.path=/foo --> /foo _path=/foo/ --> match
5693 * match.path=/foo/ --> /foo _path=/foo/d --> match
5694 * match.path=/foo --> /foo _path=/food --> mismatch
5695 *
5696 * All the other cases --> mismatch
5697 */
5698 bool path_matched = true;
5699 char *first = strstr(_tpath, auth->match.path);
5700 if (first != _tpath ||
5701 (tlen > len && _tpath[len] != '/')) {
5702 path_matched = false;
5703 }
5704
5705 if (free_tpath)
5706 kfree(_tpath);
5707
5708 if (!path_matched)
5709 return 0;
5710 }
5711 }
5712
5713 doutc(cl, "matched\n");
5714 return 1;
5715}
5716
5717int ceph_mds_check_access(struct ceph_mds_client *mdsc, char *tpath, int mask)
5718{
5719 const struct cred *cred = get_current_cred();
5720 u32 caller_uid = from_kuid(&init_user_ns, cred->fsuid);
5721 u32 caller_gid = from_kgid(&init_user_ns, cred->fsgid);
5722 struct ceph_mds_cap_auth *rw_perms_s = NULL;
5723 struct ceph_client *cl = mdsc->fsc->client;
5724 bool root_squash_perms = true;
5725 int i, err;
5726
5727 doutc(cl, "tpath '%s', mask %d, caller_uid %d, caller_gid %d\n",
5728 tpath, mask, caller_uid, caller_gid);
5729
5730 for (i = 0; i < mdsc->s_cap_auths_num; i++) {
5731 struct ceph_mds_cap_auth *s = &mdsc->s_cap_auths[i];
5732
5733 err = ceph_mds_auth_match(mdsc, s, cred, tpath);
5734 if (err < 0) {
5735 put_cred(cred);
5736 return err;
5737 } else if (err > 0) {
5738 /* always follow the last auth caps' permission */
5739 root_squash_perms = true;
5740 rw_perms_s = NULL;
5741 if ((mask & MAY_WRITE) && s->writeable &&
5742 s->match.root_squash && (!caller_uid || !caller_gid))
5743 root_squash_perms = false;
5744
5745 if (((mask & MAY_WRITE) && !s->writeable) ||
5746 ((mask & MAY_READ) && !s->readable))
5747 rw_perms_s = s;
5748 }
5749 }
5750
5751 put_cred(cred);
5752
5753 doutc(cl, "root_squash_perms %d, rw_perms_s %p\n", root_squash_perms,
5754 rw_perms_s);
5755 if (root_squash_perms && rw_perms_s == NULL) {
5756 doutc(cl, "access allowed\n");
5757 return 0;
5758 }
5759
5760 if (!root_squash_perms) {
5761 doutc(cl, "root_squash is enabled and user(%d %d) isn't allowed to write",
5762 caller_uid, caller_gid);
5763 }
5764 if (rw_perms_s) {
5765 doutc(cl, "mds auth caps readable/writeable %d/%d while request r/w %d/%d",
5766 rw_perms_s->readable, rw_perms_s->writeable,
5767 !!(mask & MAY_READ), !!(mask & MAY_WRITE));
5768 }
5769 doutc(cl, "access denied\n");
5770 return -EACCES;
5771}
5772
5773/*
5774 * called before mount is ro, and before dentries are torn down.
5775 * (hmm, does this still race with new lookups?)
5776 */
5777void ceph_mdsc_pre_umount(struct ceph_mds_client *mdsc)
5778{
5779 doutc(mdsc->fsc->client, "begin\n");
5780 mdsc->stopping = CEPH_MDSC_STOPPING_BEGIN;
5781
5782 ceph_mdsc_iterate_sessions(mdsc, send_flush_mdlog, true);
5783 ceph_mdsc_iterate_sessions(mdsc, lock_unlock_session, false);
5784 ceph_flush_dirty_caps(mdsc);
5785 wait_requests(mdsc);
5786
5787 /*
5788 * wait for reply handlers to drop their request refs and
5789 * their inode/dcache refs
5790 */
5791 ceph_msgr_flush();
5792
5793 ceph_cleanup_quotarealms_inodes(mdsc);
5794 doutc(mdsc->fsc->client, "done\n");
5795}
5796
5797/*
5798 * flush the mdlog and wait for all write mds requests to flush.
5799 */
5800static void flush_mdlog_and_wait_mdsc_unsafe_requests(struct ceph_mds_client *mdsc,
5801 u64 want_tid)
5802{
5803 struct ceph_client *cl = mdsc->fsc->client;
5804 struct ceph_mds_request *req = NULL, *nextreq;
5805 struct ceph_mds_session *last_session = NULL;
5806 struct rb_node *n;
5807
5808 mutex_lock(&mdsc->mutex);
5809 doutc(cl, "want %lld\n", want_tid);
5810restart:
5811 req = __get_oldest_req(mdsc);
5812 while (req && req->r_tid <= want_tid) {
5813 /* find next request */
5814 n = rb_next(&req->r_node);
5815 if (n)
5816 nextreq = rb_entry(n, struct ceph_mds_request, r_node);
5817 else
5818 nextreq = NULL;
5819 if (req->r_op != CEPH_MDS_OP_SETFILELOCK &&
5820 (req->r_op & CEPH_MDS_OP_WRITE)) {
5821 struct ceph_mds_session *s = req->r_session;
5822
5823 if (!s) {
5824 req = nextreq;
5825 continue;
5826 }
5827
5828 /* write op */
5829 ceph_mdsc_get_request(req);
5830 if (nextreq)
5831 ceph_mdsc_get_request(nextreq);
5832 s = ceph_get_mds_session(s);
5833 mutex_unlock(&mdsc->mutex);
5834
5835 /* send flush mdlog request to MDS */
5836 if (last_session != s) {
5837 send_flush_mdlog(s);
5838 ceph_put_mds_session(last_session);
5839 last_session = s;
5840 } else {
5841 ceph_put_mds_session(s);
5842 }
5843 doutc(cl, "wait on %llu (want %llu)\n",
5844 req->r_tid, want_tid);
5845 wait_for_completion(&req->r_safe_completion);
5846
5847 mutex_lock(&mdsc->mutex);
5848 ceph_mdsc_put_request(req);
5849 if (!nextreq)
5850 break; /* next dne before, so we're done! */
5851 if (RB_EMPTY_NODE(&nextreq->r_node)) {
5852 /* next request was removed from tree */
5853 ceph_mdsc_put_request(nextreq);
5854 goto restart;
5855 }
5856 ceph_mdsc_put_request(nextreq); /* won't go away */
5857 }
5858 req = nextreq;
5859 }
5860 mutex_unlock(&mdsc->mutex);
5861 ceph_put_mds_session(last_session);
5862 doutc(cl, "done\n");
5863}
5864
5865void ceph_mdsc_sync(struct ceph_mds_client *mdsc)
5866{
5867 struct ceph_client *cl = mdsc->fsc->client;
5868 u64 want_tid, want_flush;
5869
5870 if (READ_ONCE(mdsc->fsc->mount_state) >= CEPH_MOUNT_SHUTDOWN)
5871 return;
5872
5873 doutc(cl, "sync\n");
5874 mutex_lock(&mdsc->mutex);
5875 want_tid = mdsc->last_tid;
5876 mutex_unlock(&mdsc->mutex);
5877
5878 ceph_flush_dirty_caps(mdsc);
5879 ceph_flush_cap_releases(mdsc);
5880 spin_lock(&mdsc->cap_dirty_lock);
5881 want_flush = mdsc->last_cap_flush_tid;
5882 if (!list_empty(&mdsc->cap_flush_list)) {
5883 struct ceph_cap_flush *cf =
5884 list_last_entry(&mdsc->cap_flush_list,
5885 struct ceph_cap_flush, g_list);
5886 cf->wake = true;
5887 }
5888 spin_unlock(&mdsc->cap_dirty_lock);
5889
5890 doutc(cl, "sync want tid %lld flush_seq %lld\n", want_tid, want_flush);
5891
5892 flush_mdlog_and_wait_mdsc_unsafe_requests(mdsc, want_tid);
5893 wait_caps_flush(mdsc, want_flush);
5894}
5895
5896/*
5897 * true if all sessions are closed, or we force unmount
5898 */
5899static bool done_closing_sessions(struct ceph_mds_client *mdsc, int skipped)
5900{
5901 if (READ_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_SHUTDOWN)
5902 return true;
5903 return atomic_read(&mdsc->num_sessions) <= skipped;
5904}
5905
5906/*
5907 * called after sb is ro or when metadata corrupted.
5908 */
5909void ceph_mdsc_close_sessions(struct ceph_mds_client *mdsc)
5910{
5911 struct ceph_options *opts = mdsc->fsc->client->options;
5912 struct ceph_client *cl = mdsc->fsc->client;
5913 struct ceph_mds_session *session;
5914 int i;
5915 int skipped = 0;
5916
5917 doutc(cl, "begin\n");
5918
5919 /* close sessions */
5920 mutex_lock(&mdsc->mutex);
5921 for (i = 0; i < mdsc->max_sessions; i++) {
5922 session = __ceph_lookup_mds_session(mdsc, i);
5923 if (!session)
5924 continue;
5925 mutex_unlock(&mdsc->mutex);
5926 mutex_lock(&session->s_mutex);
5927 if (__close_session(mdsc, session) <= 0)
5928 skipped++;
5929 mutex_unlock(&session->s_mutex);
5930 ceph_put_mds_session(session);
5931 mutex_lock(&mdsc->mutex);
5932 }
5933 mutex_unlock(&mdsc->mutex);
5934
5935 doutc(cl, "waiting for sessions to close\n");
5936 wait_event_timeout(mdsc->session_close_wq,
5937 done_closing_sessions(mdsc, skipped),
5938 ceph_timeout_jiffies(opts->mount_timeout));
5939
5940 /* tear down remaining sessions */
5941 mutex_lock(&mdsc->mutex);
5942 for (i = 0; i < mdsc->max_sessions; i++) {
5943 if (mdsc->sessions[i]) {
5944 session = ceph_get_mds_session(mdsc->sessions[i]);
5945 __unregister_session(mdsc, session);
5946 mutex_unlock(&mdsc->mutex);
5947 mutex_lock(&session->s_mutex);
5948 remove_session_caps(session);
5949 mutex_unlock(&session->s_mutex);
5950 ceph_put_mds_session(session);
5951 mutex_lock(&mdsc->mutex);
5952 }
5953 }
5954 WARN_ON(!list_empty(&mdsc->cap_delay_list));
5955 mutex_unlock(&mdsc->mutex);
5956
5957 ceph_cleanup_snapid_map(mdsc);
5958 ceph_cleanup_global_and_empty_realms(mdsc);
5959
5960 cancel_work_sync(&mdsc->cap_reclaim_work);
5961 cancel_work_sync(&mdsc->cap_unlink_work);
5962 cancel_delayed_work_sync(&mdsc->delayed_work); /* cancel timer */
5963
5964 doutc(cl, "done\n");
5965}
5966
5967void ceph_mdsc_force_umount(struct ceph_mds_client *mdsc)
5968{
5969 struct ceph_mds_session *session;
5970 int mds;
5971
5972 doutc(mdsc->fsc->client, "force umount\n");
5973
5974 mutex_lock(&mdsc->mutex);
5975 for (mds = 0; mds < mdsc->max_sessions; mds++) {
5976 session = __ceph_lookup_mds_session(mdsc, mds);
5977 if (!session)
5978 continue;
5979
5980 if (session->s_state == CEPH_MDS_SESSION_REJECTED)
5981 __unregister_session(mdsc, session);
5982 __wake_requests(mdsc, &session->s_waiting);
5983 mutex_unlock(&mdsc->mutex);
5984
5985 mutex_lock(&session->s_mutex);
5986 __close_session(mdsc, session);
5987 if (session->s_state == CEPH_MDS_SESSION_CLOSING) {
5988 cleanup_session_requests(mdsc, session);
5989 remove_session_caps(session);
5990 }
5991 mutex_unlock(&session->s_mutex);
5992 ceph_put_mds_session(session);
5993
5994 mutex_lock(&mdsc->mutex);
5995 kick_requests(mdsc, mds);
5996 }
5997 __wake_requests(mdsc, &mdsc->waiting_for_map);
5998 mutex_unlock(&mdsc->mutex);
5999}
6000
6001static void ceph_mdsc_stop(struct ceph_mds_client *mdsc)
6002{
6003 doutc(mdsc->fsc->client, "stop\n");
6004 /*
6005 * Make sure the delayed work stopped before releasing
6006 * the resources.
6007 *
6008 * Because the cancel_delayed_work_sync() will only
6009 * guarantee that the work finishes executing. But the
6010 * delayed work will re-arm itself again after that.
6011 */
6012 flush_delayed_work(&mdsc->delayed_work);
6013
6014 if (mdsc->mdsmap)
6015 ceph_mdsmap_destroy(mdsc->mdsmap);
6016 kfree(mdsc->sessions);
6017 ceph_caps_finalize(mdsc);
6018
6019 if (mdsc->s_cap_auths) {
6020 int i;
6021
6022 for (i = 0; i < mdsc->s_cap_auths_num; i++) {
6023 kfree(mdsc->s_cap_auths[i].match.gids);
6024 kfree(mdsc->s_cap_auths[i].match.path);
6025 kfree(mdsc->s_cap_auths[i].match.fs_name);
6026 }
6027 kfree(mdsc->s_cap_auths);
6028 }
6029
6030 ceph_pool_perm_destroy(mdsc);
6031}
6032
6033void ceph_mdsc_destroy(struct ceph_fs_client *fsc)
6034{
6035 struct ceph_mds_client *mdsc = fsc->mdsc;
6036 doutc(fsc->client, "%p\n", mdsc);
6037
6038 if (!mdsc)
6039 return;
6040
6041 /* flush out any connection work with references to us */
6042 ceph_msgr_flush();
6043
6044 ceph_mdsc_stop(mdsc);
6045
6046 ceph_metric_destroy(&mdsc->metric);
6047
6048 fsc->mdsc = NULL;
6049 kfree(mdsc);
6050 doutc(fsc->client, "%p done\n", mdsc);
6051}
6052
6053void ceph_mdsc_handle_fsmap(struct ceph_mds_client *mdsc, struct ceph_msg *msg)
6054{
6055 struct ceph_fs_client *fsc = mdsc->fsc;
6056 struct ceph_client *cl = fsc->client;
6057 const char *mds_namespace = fsc->mount_options->mds_namespace;
6058 void *p = msg->front.iov_base;
6059 void *end = p + msg->front.iov_len;
6060 u32 epoch;
6061 u32 num_fs;
6062 u32 mount_fscid = (u32)-1;
6063 int err = -EINVAL;
6064
6065 ceph_decode_need(&p, end, sizeof(u32), bad);
6066 epoch = ceph_decode_32(&p);
6067
6068 doutc(cl, "epoch %u\n", epoch);
6069
6070 /* struct_v, struct_cv, map_len, epoch, legacy_client_fscid */
6071 ceph_decode_skip_n(&p, end, 2 + sizeof(u32) * 3, bad);
6072
6073 ceph_decode_32_safe(&p, end, num_fs, bad);
6074 while (num_fs-- > 0) {
6075 void *info_p, *info_end;
6076 u32 info_len;
6077 u32 fscid, namelen;
6078
6079 ceph_decode_need(&p, end, 2 + sizeof(u32), bad);
6080 p += 2; // info_v, info_cv
6081 info_len = ceph_decode_32(&p);
6082 ceph_decode_need(&p, end, info_len, bad);
6083 info_p = p;
6084 info_end = p + info_len;
6085 p = info_end;
6086
6087 ceph_decode_need(&info_p, info_end, sizeof(u32) * 2, bad);
6088 fscid = ceph_decode_32(&info_p);
6089 namelen = ceph_decode_32(&info_p);
6090 ceph_decode_need(&info_p, info_end, namelen, bad);
6091
6092 if (mds_namespace &&
6093 strlen(mds_namespace) == namelen &&
6094 !strncmp(mds_namespace, (char *)info_p, namelen)) {
6095 mount_fscid = fscid;
6096 break;
6097 }
6098 }
6099
6100 ceph_monc_got_map(&fsc->client->monc, CEPH_SUB_FSMAP, epoch);
6101 if (mount_fscid != (u32)-1) {
6102 fsc->client->monc.fs_cluster_id = mount_fscid;
6103 ceph_monc_want_map(&fsc->client->monc, CEPH_SUB_MDSMAP,
6104 0, true);
6105 ceph_monc_renew_subs(&fsc->client->monc);
6106 } else {
6107 err = -ENOENT;
6108 goto err_out;
6109 }
6110 return;
6111
6112bad:
6113 pr_err_client(cl, "error decoding fsmap %d. Shutting down mount.\n",
6114 err);
6115 ceph_umount_begin(mdsc->fsc->sb);
6116 ceph_msg_dump(msg);
6117err_out:
6118 mutex_lock(&mdsc->mutex);
6119 mdsc->mdsmap_err = err;
6120 __wake_requests(mdsc, &mdsc->waiting_for_map);
6121 mutex_unlock(&mdsc->mutex);
6122}
6123
6124/*
6125 * handle mds map update.
6126 */
6127void ceph_mdsc_handle_mdsmap(struct ceph_mds_client *mdsc, struct ceph_msg *msg)
6128{
6129 struct ceph_client *cl = mdsc->fsc->client;
6130 u32 epoch;
6131 u32 maplen;
6132 void *p = msg->front.iov_base;
6133 void *end = p + msg->front.iov_len;
6134 struct ceph_mdsmap *newmap, *oldmap;
6135 struct ceph_fsid fsid;
6136 int err = -EINVAL;
6137
6138 ceph_decode_need(&p, end, sizeof(fsid)+2*sizeof(u32), bad);
6139 ceph_decode_copy(&p, &fsid, sizeof(fsid));
6140 if (ceph_check_fsid(mdsc->fsc->client, &fsid) < 0)
6141 return;
6142 epoch = ceph_decode_32(&p);
6143 maplen = ceph_decode_32(&p);
6144 doutc(cl, "epoch %u len %d\n", epoch, (int)maplen);
6145
6146 /* do we need it? */
6147 mutex_lock(&mdsc->mutex);
6148 if (mdsc->mdsmap && epoch <= mdsc->mdsmap->m_epoch) {
6149 doutc(cl, "epoch %u <= our %u\n", epoch, mdsc->mdsmap->m_epoch);
6150 mutex_unlock(&mdsc->mutex);
6151 return;
6152 }
6153
6154 newmap = ceph_mdsmap_decode(mdsc, &p, end, ceph_msgr2(mdsc->fsc->client));
6155 if (IS_ERR(newmap)) {
6156 err = PTR_ERR(newmap);
6157 goto bad_unlock;
6158 }
6159
6160 /* swap into place */
6161 if (mdsc->mdsmap) {
6162 oldmap = mdsc->mdsmap;
6163 mdsc->mdsmap = newmap;
6164 check_new_map(mdsc, newmap, oldmap);
6165 ceph_mdsmap_destroy(oldmap);
6166 } else {
6167 mdsc->mdsmap = newmap; /* first mds map */
6168 }
6169 mdsc->fsc->max_file_size = min((loff_t)mdsc->mdsmap->m_max_file_size,
6170 MAX_LFS_FILESIZE);
6171
6172 __wake_requests(mdsc, &mdsc->waiting_for_map);
6173 ceph_monc_got_map(&mdsc->fsc->client->monc, CEPH_SUB_MDSMAP,
6174 mdsc->mdsmap->m_epoch);
6175
6176 mutex_unlock(&mdsc->mutex);
6177 schedule_delayed(mdsc, 0);
6178 return;
6179
6180bad_unlock:
6181 mutex_unlock(&mdsc->mutex);
6182bad:
6183 pr_err_client(cl, "error decoding mdsmap %d. Shutting down mount.\n",
6184 err);
6185 ceph_umount_begin(mdsc->fsc->sb);
6186 ceph_msg_dump(msg);
6187 return;
6188}
6189
6190static struct ceph_connection *mds_get_con(struct ceph_connection *con)
6191{
6192 struct ceph_mds_session *s = con->private;
6193
6194 if (ceph_get_mds_session(s))
6195 return con;
6196 return NULL;
6197}
6198
6199static void mds_put_con(struct ceph_connection *con)
6200{
6201 struct ceph_mds_session *s = con->private;
6202
6203 ceph_put_mds_session(s);
6204}
6205
6206/*
6207 * if the client is unresponsive for long enough, the mds will kill
6208 * the session entirely.
6209 */
6210static void mds_peer_reset(struct ceph_connection *con)
6211{
6212 struct ceph_mds_session *s = con->private;
6213 struct ceph_mds_client *mdsc = s->s_mdsc;
6214
6215 pr_warn_client(mdsc->fsc->client, "mds%d closed our session\n",
6216 s->s_mds);
6217 if (READ_ONCE(mdsc->fsc->mount_state) != CEPH_MOUNT_FENCE_IO &&
6218 ceph_mdsmap_get_state(mdsc->mdsmap, s->s_mds) >= CEPH_MDS_STATE_RECONNECT)
6219 send_mds_reconnect(mdsc, s);
6220}
6221
6222static void mds_dispatch(struct ceph_connection *con, struct ceph_msg *msg)
6223{
6224 struct ceph_mds_session *s = con->private;
6225 struct ceph_mds_client *mdsc = s->s_mdsc;
6226 struct ceph_client *cl = mdsc->fsc->client;
6227 int type = le16_to_cpu(msg->hdr.type);
6228
6229 mutex_lock(&mdsc->mutex);
6230 if (__verify_registered_session(mdsc, s) < 0) {
6231 mutex_unlock(&mdsc->mutex);
6232 goto out;
6233 }
6234 mutex_unlock(&mdsc->mutex);
6235
6236 switch (type) {
6237 case CEPH_MSG_MDS_MAP:
6238 ceph_mdsc_handle_mdsmap(mdsc, msg);
6239 break;
6240 case CEPH_MSG_FS_MAP_USER:
6241 ceph_mdsc_handle_fsmap(mdsc, msg);
6242 break;
6243 case CEPH_MSG_CLIENT_SESSION:
6244 handle_session(s, msg);
6245 break;
6246 case CEPH_MSG_CLIENT_REPLY:
6247 handle_reply(s, msg);
6248 break;
6249 case CEPH_MSG_CLIENT_REQUEST_FORWARD:
6250 handle_forward(mdsc, s, msg);
6251 break;
6252 case CEPH_MSG_CLIENT_CAPS:
6253 ceph_handle_caps(s, msg);
6254 break;
6255 case CEPH_MSG_CLIENT_SNAP:
6256 ceph_handle_snap(mdsc, s, msg);
6257 break;
6258 case CEPH_MSG_CLIENT_LEASE:
6259 handle_lease(mdsc, s, msg);
6260 break;
6261 case CEPH_MSG_CLIENT_QUOTA:
6262 ceph_handle_quota(mdsc, s, msg);
6263 break;
6264
6265 default:
6266 pr_err_client(cl, "received unknown message type %d %s\n",
6267 type, ceph_msg_type_name(type));
6268 }
6269out:
6270 ceph_msg_put(msg);
6271}
6272
6273/*
6274 * authentication
6275 */
6276
6277/*
6278 * Note: returned pointer is the address of a structure that's
6279 * managed separately. Caller must *not* attempt to free it.
6280 */
6281static struct ceph_auth_handshake *
6282mds_get_authorizer(struct ceph_connection *con, int *proto, int force_new)
6283{
6284 struct ceph_mds_session *s = con->private;
6285 struct ceph_mds_client *mdsc = s->s_mdsc;
6286 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
6287 struct ceph_auth_handshake *auth = &s->s_auth;
6288 int ret;
6289
6290 ret = __ceph_auth_get_authorizer(ac, auth, CEPH_ENTITY_TYPE_MDS,
6291 force_new, proto, NULL, NULL);
6292 if (ret)
6293 return ERR_PTR(ret);
6294
6295 return auth;
6296}
6297
6298static int mds_add_authorizer_challenge(struct ceph_connection *con,
6299 void *challenge_buf, int challenge_buf_len)
6300{
6301 struct ceph_mds_session *s = con->private;
6302 struct ceph_mds_client *mdsc = s->s_mdsc;
6303 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
6304
6305 return ceph_auth_add_authorizer_challenge(ac, s->s_auth.authorizer,
6306 challenge_buf, challenge_buf_len);
6307}
6308
6309static int mds_verify_authorizer_reply(struct ceph_connection *con)
6310{
6311 struct ceph_mds_session *s = con->private;
6312 struct ceph_mds_client *mdsc = s->s_mdsc;
6313 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
6314 struct ceph_auth_handshake *auth = &s->s_auth;
6315
6316 return ceph_auth_verify_authorizer_reply(ac, auth->authorizer,
6317 auth->authorizer_reply_buf, auth->authorizer_reply_buf_len,
6318 NULL, NULL, NULL, NULL);
6319}
6320
6321static int mds_invalidate_authorizer(struct ceph_connection *con)
6322{
6323 struct ceph_mds_session *s = con->private;
6324 struct ceph_mds_client *mdsc = s->s_mdsc;
6325 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
6326
6327 ceph_auth_invalidate_authorizer(ac, CEPH_ENTITY_TYPE_MDS);
6328
6329 return ceph_monc_validate_auth(&mdsc->fsc->client->monc);
6330}
6331
6332static int mds_get_auth_request(struct ceph_connection *con,
6333 void *buf, int *buf_len,
6334 void **authorizer, int *authorizer_len)
6335{
6336 struct ceph_mds_session *s = con->private;
6337 struct ceph_auth_client *ac = s->s_mdsc->fsc->client->monc.auth;
6338 struct ceph_auth_handshake *auth = &s->s_auth;
6339 int ret;
6340
6341 ret = ceph_auth_get_authorizer(ac, auth, CEPH_ENTITY_TYPE_MDS,
6342 buf, buf_len);
6343 if (ret)
6344 return ret;
6345
6346 *authorizer = auth->authorizer_buf;
6347 *authorizer_len = auth->authorizer_buf_len;
6348 return 0;
6349}
6350
6351static int mds_handle_auth_reply_more(struct ceph_connection *con,
6352 void *reply, int reply_len,
6353 void *buf, int *buf_len,
6354 void **authorizer, int *authorizer_len)
6355{
6356 struct ceph_mds_session *s = con->private;
6357 struct ceph_auth_client *ac = s->s_mdsc->fsc->client->monc.auth;
6358 struct ceph_auth_handshake *auth = &s->s_auth;
6359 int ret;
6360
6361 ret = ceph_auth_handle_svc_reply_more(ac, auth, reply, reply_len,
6362 buf, buf_len);
6363 if (ret)
6364 return ret;
6365
6366 *authorizer = auth->authorizer_buf;
6367 *authorizer_len = auth->authorizer_buf_len;
6368 return 0;
6369}
6370
6371static int mds_handle_auth_done(struct ceph_connection *con,
6372 u64 global_id, void *reply, int reply_len,
6373 u8 *session_key, int *session_key_len,
6374 u8 *con_secret, int *con_secret_len)
6375{
6376 struct ceph_mds_session *s = con->private;
6377 struct ceph_auth_client *ac = s->s_mdsc->fsc->client->monc.auth;
6378 struct ceph_auth_handshake *auth = &s->s_auth;
6379
6380 return ceph_auth_handle_svc_reply_done(ac, auth, reply, reply_len,
6381 session_key, session_key_len,
6382 con_secret, con_secret_len);
6383}
6384
6385static int mds_handle_auth_bad_method(struct ceph_connection *con,
6386 int used_proto, int result,
6387 const int *allowed_protos, int proto_cnt,
6388 const int *allowed_modes, int mode_cnt)
6389{
6390 struct ceph_mds_session *s = con->private;
6391 struct ceph_mon_client *monc = &s->s_mdsc->fsc->client->monc;
6392 int ret;
6393
6394 if (ceph_auth_handle_bad_authorizer(monc->auth, CEPH_ENTITY_TYPE_MDS,
6395 used_proto, result,
6396 allowed_protos, proto_cnt,
6397 allowed_modes, mode_cnt)) {
6398 ret = ceph_monc_validate_auth(monc);
6399 if (ret)
6400 return ret;
6401 }
6402
6403 return -EACCES;
6404}
6405
6406static struct ceph_msg *mds_alloc_msg(struct ceph_connection *con,
6407 struct ceph_msg_header *hdr, int *skip)
6408{
6409 struct ceph_msg *msg;
6410 int type = (int) le16_to_cpu(hdr->type);
6411 int front_len = (int) le32_to_cpu(hdr->front_len);
6412
6413 if (con->in_msg)
6414 return con->in_msg;
6415
6416 *skip = 0;
6417 msg = ceph_msg_new(type, front_len, GFP_NOFS, false);
6418 if (!msg) {
6419 pr_err("unable to allocate msg type %d len %d\n",
6420 type, front_len);
6421 return NULL;
6422 }
6423
6424 return msg;
6425}
6426
6427static int mds_sign_message(struct ceph_msg *msg)
6428{
6429 struct ceph_mds_session *s = msg->con->private;
6430 struct ceph_auth_handshake *auth = &s->s_auth;
6431
6432 return ceph_auth_sign_message(auth, msg);
6433}
6434
6435static int mds_check_message_signature(struct ceph_msg *msg)
6436{
6437 struct ceph_mds_session *s = msg->con->private;
6438 struct ceph_auth_handshake *auth = &s->s_auth;
6439
6440 return ceph_auth_check_message_signature(auth, msg);
6441}
6442
6443static const struct ceph_connection_operations mds_con_ops = {
6444 .get = mds_get_con,
6445 .put = mds_put_con,
6446 .alloc_msg = mds_alloc_msg,
6447 .dispatch = mds_dispatch,
6448 .peer_reset = mds_peer_reset,
6449 .get_authorizer = mds_get_authorizer,
6450 .add_authorizer_challenge = mds_add_authorizer_challenge,
6451 .verify_authorizer_reply = mds_verify_authorizer_reply,
6452 .invalidate_authorizer = mds_invalidate_authorizer,
6453 .sign_message = mds_sign_message,
6454 .check_message_signature = mds_check_message_signature,
6455 .get_auth_request = mds_get_auth_request,
6456 .handle_auth_reply_more = mds_handle_auth_reply_more,
6457 .handle_auth_done = mds_handle_auth_done,
6458 .handle_auth_bad_method = mds_handle_auth_bad_method,
6459};
6460
6461/* eof */
Linux 6.x block layer and io_uring tree(s)