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52 * are no longer valid.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
55 struct 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
63 static void __wake_requests(struct ceph_mds_client *mdsc,
64 struct list_head *head);
65 static void ceph_cap_release_work(struct work_struct *work);
66 static void ceph_cap_reclaim_work(struct work_struct *work);
67
68 static const struct ceph_connection_operations mds_con_ops;
69
70
71 /*
72 * mds reply parsing
73 */
74
75 static 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;
94 bad:
95 return -EIO;
96 }
97
98 /*
99 * parse individual inode info
100 */
101 static 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;
276 bad:
277 err = -EIO;
278 out_bad:
279 return err;
280 }
281
282 static 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;
308 bad:
309 return -EIO;
310 }
311
312 static 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;
356 bad:
357 return -EIO;
358 }
359
360 /*
361 * parse a normal reply, which may contain a (dir+)dentry and/or a
362 * target inode.
363 */
364 static 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
400 bad:
401 err = -EIO;
402 out_bad:
403 pr_err("problem parsing mds trace %d\n", err);
404 return err;
405 }
406
407 /*
408 * parse readdir results
409 */
410 static 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
536 done:
537 /* Skip over any unrecognized fields */
538 *p = end;
539 return 0;
540
541 bad:
542 err = -EIO;
543 out_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 */
551 static 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;
563 bad:
564 return -EIO;
565 }
566
567
568 #if BITS_PER_LONG == 64
569
570 #define DELEGATED_INO_AVAILABLE xa_mk_value(1)
571
572 static 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;
609 bad:
610 return -EIO;
611 }
612
613 u64 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
626 int 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 */
637 static 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;
646 bad:
647 return -EIO;
648 }
649
650 u64 ceph_get_deleg_ino(struct ceph_mds_session *s)
651 {
652 return 0;
653 }
654
655 int 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 */
664 static 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;
696 bad:
697 return -EIO;
698 }
699
700 static 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 }
718 bad:
719 return -EIO;
720 }
721
722 /*
723 * parse extra results
724 */
725 static 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 */
747 static 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
788 bad:
789 err = -EIO;
790 out_bad:
791 pr_err_client(cl, "mds parse_reply err %d\n", err);
792 ceph_msg_dump(msg);
793 return err;
794 }
795
796 static 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 * CDenty. That means the just created file is possiblly 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 */
836 int 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;
873 next:
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 */
894 const 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
910 struct 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
917 void 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 */
934 struct 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
942 static 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
950 static 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 */
963 static 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
1028 fail_realloc:
1029 kfree(s);
1030 return ERR_PTR(-ENOMEM);
1031 }
1032
1033 /*
1034 * called under mdsc->mutex
1035 */
1036 static 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 */
1052 static 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
1060 void 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
1087 void 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
1138 DEFINE_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 */
1145 static struct ceph_mds_request *
1146 lookup_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 */
1163 static 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
1204 static 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 */
1259 static 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 */
1282 static 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);
1424 out:
1425 iput(inode);
1426 return mds;
1427
1428 random:
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 */
1441 struct 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
1460 static 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)
1462 static 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
1491 static 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)
1493 static 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 */
1537 static struct ceph_msg *
1538 create_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 */
1661 static 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 */
1692 static 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
1714 struct ceph_mds_session *
1715 ceph_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
1729 static 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 void ceph_mdsc_open_export_target_sessions(struct ceph_mds_client *mdsc,
1751 struct ceph_mds_session *session)
1752 {
1753 mutex_lock(&mdsc->mutex);
1754 __open_export_target_sessions(mdsc, session);
1755 mutex_unlock(&mdsc->mutex);
1756 }
1757
1758 /*
1759 * session caps
1760 */
1761
1762 static void detach_cap_releases(struct ceph_mds_session *session,
1763 struct list_head *target)
1764 {
1765 struct ceph_client *cl = session->s_mdsc->fsc->client;
1766
1767 lockdep_assert_held(&session->s_cap_lock);
1768
1769 list_splice_init(&session->s_cap_releases, target);
1770 session->s_num_cap_releases = 0;
1771 doutc(cl, "mds%d\n", session->s_mds);
1772 }
1773
1774 static void dispose_cap_releases(struct ceph_mds_client *mdsc,
1775 struct list_head *dispose)
1776 {
1777 while (!list_empty(dispose)) {
1778 struct ceph_cap *cap;
1779 /* zero out the in-progress message */
1780 cap = list_first_entry(dispose, struct ceph_cap, session_caps);
1781 list_del(&cap->session_caps);
1782 ceph_put_cap(mdsc, cap);
1783 }
1784 }
1785
1786 static void cleanup_session_requests(struct ceph_mds_client *mdsc,
1787 struct ceph_mds_session *session)
1788 {
1789 struct ceph_client *cl = mdsc->fsc->client;
1790 struct ceph_mds_request *req;
1791 struct rb_node *p;
1792
1793 doutc(cl, "mds%d\n", session->s_mds);
1794 mutex_lock(&mdsc->mutex);
1795 while (!list_empty(&session->s_unsafe)) {
1796 req = list_first_entry(&session->s_unsafe,
1797 struct ceph_mds_request, r_unsafe_item);
1798 pr_warn_ratelimited_client(cl, " dropping unsafe request %llu\n",
1799 req->r_tid);
1800 if (req->r_target_inode)
1801 mapping_set_error(req->r_target_inode->i_mapping, -EIO);
1802 if (req->r_unsafe_dir)
1803 mapping_set_error(req->r_unsafe_dir->i_mapping, -EIO);
1804 __unregister_request(mdsc, req);
1805 }
1806 /* zero r_attempts, so kick_requests() will re-send requests */
1807 p = rb_first(&mdsc->request_tree);
1808 while (p) {
1809 req = rb_entry(p, struct ceph_mds_request, r_node);
1810 p = rb_next(p);
1811 if (req->r_session &&
1812 req->r_session->s_mds == session->s_mds)
1813 req->r_attempts = 0;
1814 }
1815 mutex_unlock(&mdsc->mutex);
1816 }
1817
1818 /*
1819 * Helper to safely iterate over all caps associated with a session, with
1820 * special care taken to handle a racing __ceph_remove_cap().
1821 *
1822 * Caller must hold session s_mutex.
1823 */
1824 int ceph_iterate_session_caps(struct ceph_mds_session *session,
1825 int (*cb)(struct inode *, int mds, void *),
1826 void *arg)
1827 {
1828 struct ceph_client *cl = session->s_mdsc->fsc->client;
1829 struct list_head *p;
1830 struct ceph_cap *cap;
1831 struct inode *inode, *last_inode = NULL;
1832 struct ceph_cap *old_cap = NULL;
1833 int ret;
1834
1835 doutc(cl, "%p mds%d\n", session, session->s_mds);
1836 spin_lock(&session->s_cap_lock);
1837 p = session->s_caps.next;
1838 while (p != &session->s_caps) {
1839 int mds;
1840
1841 cap = list_entry(p, struct ceph_cap, session_caps);
1842 inode = igrab(&cap->ci->netfs.inode);
1843 if (!inode) {
1844 p = p->next;
1845 continue;
1846 }
1847 session->s_cap_iterator = cap;
1848 mds = cap->mds;
1849 spin_unlock(&session->s_cap_lock);
1850
1851 if (last_inode) {
1852 iput(last_inode);
1853 last_inode = NULL;
1854 }
1855 if (old_cap) {
1856 ceph_put_cap(session->s_mdsc, old_cap);
1857 old_cap = NULL;
1858 }
1859
1860 ret = cb(inode, mds, arg);
1861 last_inode = inode;
1862
1863 spin_lock(&session->s_cap_lock);
1864 p = p->next;
1865 if (!cap->ci) {
1866 doutc(cl, "finishing cap %p removal\n", cap);
1867 BUG_ON(cap->session != session);
1868 cap->session = NULL;
1869 list_del_init(&cap->session_caps);
1870 session->s_nr_caps--;
1871 atomic64_dec(&session->s_mdsc->metric.total_caps);
1872 if (cap->queue_release)
1873 __ceph_queue_cap_release(session, cap);
1874 else
1875 old_cap = cap; /* put_cap it w/o locks held */
1876 }
1877 if (ret < 0)
1878 goto out;
1879 }
1880 ret = 0;
1881 out:
1882 session->s_cap_iterator = NULL;
1883 spin_unlock(&session->s_cap_lock);
1884
1885 iput(last_inode);
1886 if (old_cap)
1887 ceph_put_cap(session->s_mdsc, old_cap);
1888
1889 return ret;
1890 }
1891
1892 static int remove_session_caps_cb(struct inode *inode, int mds, void *arg)
1893 {
1894 struct ceph_inode_info *ci = ceph_inode(inode);
1895 struct ceph_client *cl = ceph_inode_to_client(inode);
1896 bool invalidate = false;
1897 struct ceph_cap *cap;
1898 int iputs = 0;
1899
1900 spin_lock(&ci->i_ceph_lock);
1901 cap = __get_cap_for_mds(ci, mds);
1902 if (cap) {
1903 doutc(cl, " removing cap %p, ci is %p, inode is %p\n",
1904 cap, ci, &ci->netfs.inode);
1905
1906 iputs = ceph_purge_inode_cap(inode, cap, &invalidate);
1907 }
1908 spin_unlock(&ci->i_ceph_lock);
1909
1910 if (cap)
1911 wake_up_all(&ci->i_cap_wq);
1912 if (invalidate)
1913 ceph_queue_invalidate(inode);
1914 while (iputs--)
1915 iput(inode);
1916 return 0;
1917 }
1918
1919 /*
1920 * caller must hold session s_mutex
1921 */
1922 static void remove_session_caps(struct ceph_mds_session *session)
1923 {
1924 struct ceph_fs_client *fsc = session->s_mdsc->fsc;
1925 struct super_block *sb = fsc->sb;
1926 LIST_HEAD(dispose);
1927
1928 doutc(fsc->client, "on %p\n", session);
1929 ceph_iterate_session_caps(session, remove_session_caps_cb, fsc);
1930
1931 wake_up_all(&fsc->mdsc->cap_flushing_wq);
1932
1933 spin_lock(&session->s_cap_lock);
1934 if (session->s_nr_caps > 0) {
1935 struct inode *inode;
1936 struct ceph_cap *cap, *prev = NULL;
1937 struct ceph_vino vino;
1938 /*
1939 * iterate_session_caps() skips inodes that are being
1940 * deleted, we need to wait until deletions are complete.
1941 * __wait_on_freeing_inode() is designed for the job,
1942 * but it is not exported, so use lookup inode function
1943 * to access it.
1944 */
1945 while (!list_empty(&session->s_caps)) {
1946 cap = list_entry(session->s_caps.next,
1947 struct ceph_cap, session_caps);
1948 if (cap == prev)
1949 break;
1950 prev = cap;
1951 vino = cap->ci->i_vino;
1952 spin_unlock(&session->s_cap_lock);
1953
1954 inode = ceph_find_inode(sb, vino);
1955 iput(inode);
1956
1957 spin_lock(&session->s_cap_lock);
1958 }
1959 }
1960
1961 // drop cap expires and unlock s_cap_lock
1962 detach_cap_releases(session, &dispose);
1963
1964 BUG_ON(session->s_nr_caps > 0);
1965 BUG_ON(!list_empty(&session->s_cap_flushing));
1966 spin_unlock(&session->s_cap_lock);
1967 dispose_cap_releases(session->s_mdsc, &dispose);
1968 }
1969
1970 enum {
1971 RECONNECT,
1972 RENEWCAPS,
1973 FORCE_RO,
1974 };
1975
1976 /*
1977 * wake up any threads waiting on this session's caps. if the cap is
1978 * old (didn't get renewed on the client reconnect), remove it now.
1979 *
1980 * caller must hold s_mutex.
1981 */
1982 static int wake_up_session_cb(struct inode *inode, int mds, void *arg)
1983 {
1984 struct ceph_inode_info *ci = ceph_inode(inode);
1985 unsigned long ev = (unsigned long)arg;
1986
1987 if (ev == RECONNECT) {
1988 spin_lock(&ci->i_ceph_lock);
1989 ci->i_wanted_max_size = 0;
1990 ci->i_requested_max_size = 0;
1991 spin_unlock(&ci->i_ceph_lock);
1992 } else if (ev == RENEWCAPS) {
1993 struct ceph_cap *cap;
1994
1995 spin_lock(&ci->i_ceph_lock);
1996 cap = __get_cap_for_mds(ci, mds);
1997 /* mds did not re-issue stale cap */
1998 if (cap && cap->cap_gen < atomic_read(&cap->session->s_cap_gen))
1999 cap->issued = cap->implemented = CEPH_CAP_PIN;
2000 spin_unlock(&ci->i_ceph_lock);
2001 } else if (ev == FORCE_RO) {
2002 }
2003 wake_up_all(&ci->i_cap_wq);
2004 return 0;
2005 }
2006
2007 static void wake_up_session_caps(struct ceph_mds_session *session, int ev)
2008 {
2009 struct ceph_client *cl = session->s_mdsc->fsc->client;
2010
2011 doutc(cl, "session %p mds%d\n", session, session->s_mds);
2012 ceph_iterate_session_caps(session, wake_up_session_cb,
2013 (void *)(unsigned long)ev);
2014 }
2015
2016 /*
2017 * Send periodic message to MDS renewing all currently held caps. The
2018 * ack will reset the expiration for all caps from this session.
2019 *
2020 * caller holds s_mutex
2021 */
2022 static int send_renew_caps(struct ceph_mds_client *mdsc,
2023 struct ceph_mds_session *session)
2024 {
2025 struct ceph_client *cl = mdsc->fsc->client;
2026 struct ceph_msg *msg;
2027 int state;
2028
2029 if (time_after_eq(jiffies, session->s_cap_ttl) &&
2030 time_after_eq(session->s_cap_ttl, session->s_renew_requested))
2031 pr_info_client(cl, "mds%d caps stale\n", session->s_mds);
2032 session->s_renew_requested = jiffies;
2033
2034 /* do not try to renew caps until a recovering mds has reconnected
2035 * with its clients. */
2036 state = ceph_mdsmap_get_state(mdsc->mdsmap, session->s_mds);
2037 if (state < CEPH_MDS_STATE_RECONNECT) {
2038 doutc(cl, "ignoring mds%d (%s)\n", session->s_mds,
2039 ceph_mds_state_name(state));
2040 return 0;
2041 }
2042
2043 doutc(cl, "to mds%d (%s)\n", session->s_mds,
2044 ceph_mds_state_name(state));
2045 msg = create_session_full_msg(mdsc, CEPH_SESSION_REQUEST_RENEWCAPS,
2046 ++session->s_renew_seq);
2047 if (IS_ERR(msg))
2048 return PTR_ERR(msg);
2049 ceph_con_send(&session->s_con, msg);
2050 return 0;
2051 }
2052
2053 static int send_flushmsg_ack(struct ceph_mds_client *mdsc,
2054 struct ceph_mds_session *session, u64 seq)
2055 {
2056 struct ceph_client *cl = mdsc->fsc->client;
2057 struct ceph_msg *msg;
2058
2059 doutc(cl, "to mds%d (%s)s seq %lld\n", session->s_mds,
2060 ceph_session_state_name(session->s_state), seq);
2061 msg = ceph_create_session_msg(CEPH_SESSION_FLUSHMSG_ACK, seq);
2062 if (!msg)
2063 return -ENOMEM;
2064 ceph_con_send(&session->s_con, msg);
2065 return 0;
2066 }
2067
2068
2069 /*
2070 * Note new cap ttl, and any transition from stale -> not stale (fresh?).
2071 *
2072 * Called under session->s_mutex
2073 */
2074 static void renewed_caps(struct ceph_mds_client *mdsc,
2075 struct ceph_mds_session *session, int is_renew)
2076 {
2077 struct ceph_client *cl = mdsc->fsc->client;
2078 int was_stale;
2079 int wake = 0;
2080
2081 spin_lock(&session->s_cap_lock);
2082 was_stale = is_renew && time_after_eq(jiffies, session->s_cap_ttl);
2083
2084 session->s_cap_ttl = session->s_renew_requested +
2085 mdsc->mdsmap->m_session_timeout*HZ;
2086
2087 if (was_stale) {
2088 if (time_before(jiffies, session->s_cap_ttl)) {
2089 pr_info_client(cl, "mds%d caps renewed\n",
2090 session->s_mds);
2091 wake = 1;
2092 } else {
2093 pr_info_client(cl, "mds%d caps still stale\n",
2094 session->s_mds);
2095 }
2096 }
2097 doutc(cl, "mds%d ttl now %lu, was %s, now %s\n", session->s_mds,
2098 session->s_cap_ttl, was_stale ? "stale" : "fresh",
2099 time_before(jiffies, session->s_cap_ttl) ? "stale" : "fresh");
2100 spin_unlock(&session->s_cap_lock);
2101
2102 if (wake)
2103 wake_up_session_caps(session, RENEWCAPS);
2104 }
2105
2106 /*
2107 * send a session close request
2108 */
2109 static int request_close_session(struct ceph_mds_session *session)
2110 {
2111 struct ceph_client *cl = session->s_mdsc->fsc->client;
2112 struct ceph_msg *msg;
2113
2114 doutc(cl, "mds%d state %s seq %lld\n", session->s_mds,
2115 ceph_session_state_name(session->s_state), session->s_seq);
2116 msg = ceph_create_session_msg(CEPH_SESSION_REQUEST_CLOSE,
2117 session->s_seq);
2118 if (!msg)
2119 return -ENOMEM;
2120 ceph_con_send(&session->s_con, msg);
2121 return 1;
2122 }
2123
2124 /*
2125 * Called with s_mutex held.
2126 */
2127 static int __close_session(struct ceph_mds_client *mdsc,
2128 struct ceph_mds_session *session)
2129 {
2130 if (session->s_state >= CEPH_MDS_SESSION_CLOSING)
2131 return 0;
2132 session->s_state = CEPH_MDS_SESSION_CLOSING;
2133 return request_close_session(session);
2134 }
2135
2136 static bool drop_negative_children(struct dentry *dentry)
2137 {
2138 struct dentry *child;
2139 bool all_negative = true;
2140
2141 if (!d_is_dir(dentry))
2142 goto out;
2143
2144 spin_lock(&dentry->d_lock);
2145 hlist_for_each_entry(child, &dentry->d_children, d_sib) {
2146 if (d_really_is_positive(child)) {
2147 all_negative = false;
2148 break;
2149 }
2150 }
2151 spin_unlock(&dentry->d_lock);
2152
2153 if (all_negative)
2154 shrink_dcache_parent(dentry);
2155 out:
2156 return all_negative;
2157 }
2158
2159 /*
2160 * Trim old(er) caps.
2161 *
2162 * Because we can't cache an inode without one or more caps, we do
2163 * this indirectly: if a cap is unused, we prune its aliases, at which
2164 * point the inode will hopefully get dropped to.
2165 *
2166 * Yes, this is a bit sloppy. Our only real goal here is to respond to
2167 * memory pressure from the MDS, though, so it needn't be perfect.
2168 */
2169 static int trim_caps_cb(struct inode *inode, int mds, void *arg)
2170 {
2171 struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(inode->i_sb);
2172 struct ceph_client *cl = mdsc->fsc->client;
2173 int *remaining = arg;
2174 struct ceph_inode_info *ci = ceph_inode(inode);
2175 int used, wanted, oissued, mine;
2176 struct ceph_cap *cap;
2177
2178 if (*remaining <= 0)
2179 return -1;
2180
2181 spin_lock(&ci->i_ceph_lock);
2182 cap = __get_cap_for_mds(ci, mds);
2183 if (!cap) {
2184 spin_unlock(&ci->i_ceph_lock);
2185 return 0;
2186 }
2187 mine = cap->issued | cap->implemented;
2188 used = __ceph_caps_used(ci);
2189 wanted = __ceph_caps_file_wanted(ci);
2190 oissued = __ceph_caps_issued_other(ci, cap);
2191
2192 doutc(cl, "%p %llx.%llx cap %p mine %s oissued %s used %s wanted %s\n",
2193 inode, ceph_vinop(inode), cap, ceph_cap_string(mine),
2194 ceph_cap_string(oissued), ceph_cap_string(used),
2195 ceph_cap_string(wanted));
2196 if (cap == ci->i_auth_cap) {
2197 if (ci->i_dirty_caps || ci->i_flushing_caps ||
2198 !list_empty(&ci->i_cap_snaps))
2199 goto out;
2200 if ((used | wanted) & CEPH_CAP_ANY_WR)
2201 goto out;
2202 /* Note: it's possible that i_filelock_ref becomes non-zero
2203 * after dropping auth caps. It doesn't hurt because reply
2204 * of lock mds request will re-add auth caps. */
2205 if (atomic_read(&ci->i_filelock_ref) > 0)
2206 goto out;
2207 }
2208 /* The inode has cached pages, but it's no longer used.
2209 * we can safely drop it */
2210 if (S_ISREG(inode->i_mode) &&
2211 wanted == 0 && used == CEPH_CAP_FILE_CACHE &&
2212 !(oissued & CEPH_CAP_FILE_CACHE)) {
2213 used = 0;
2214 oissued = 0;
2215 }
2216 if ((used | wanted) & ~oissued & mine)
2217 goto out; /* we need these caps */
2218
2219 if (oissued) {
2220 /* we aren't the only cap.. just remove us */
2221 ceph_remove_cap(mdsc, cap, true);
2222 (*remaining)--;
2223 } else {
2224 struct dentry *dentry;
2225 /* try dropping referring dentries */
2226 spin_unlock(&ci->i_ceph_lock);
2227 dentry = d_find_any_alias(inode);
2228 if (dentry && drop_negative_children(dentry)) {
2229 int count;
2230 dput(dentry);
2231 d_prune_aliases(inode);
2232 count = atomic_read(&inode->i_count);
2233 if (count == 1)
2234 (*remaining)--;
2235 doutc(cl, "%p %llx.%llx cap %p pruned, count now %d\n",
2236 inode, ceph_vinop(inode), cap, count);
2237 } else {
2238 dput(dentry);
2239 }
2240 return 0;
2241 }
2242
2243 out:
2244 spin_unlock(&ci->i_ceph_lock);
2245 return 0;
2246 }
2247
2248 /*
2249 * Trim session cap count down to some max number.
2250 */
2251 int ceph_trim_caps(struct ceph_mds_client *mdsc,
2252 struct ceph_mds_session *session,
2253 int max_caps)
2254 {
2255 struct ceph_client *cl = mdsc->fsc->client;
2256 int trim_caps = session->s_nr_caps - max_caps;
2257
2258 doutc(cl, "mds%d start: %d / %d, trim %d\n", session->s_mds,
2259 session->s_nr_caps, max_caps, trim_caps);
2260 if (trim_caps > 0) {
2261 int remaining = trim_caps;
2262
2263 ceph_iterate_session_caps(session, trim_caps_cb, &remaining);
2264 doutc(cl, "mds%d done: %d / %d, trimmed %d\n",
2265 session->s_mds, session->s_nr_caps, max_caps,
2266 trim_caps - remaining);
2267 }
2268
2269 ceph_flush_cap_releases(mdsc, session);
2270 return 0;
2271 }
2272
2273 static int check_caps_flush(struct ceph_mds_client *mdsc,
2274 u64 want_flush_tid)
2275 {
2276 struct ceph_client *cl = mdsc->fsc->client;
2277 int ret = 1;
2278
2279 spin_lock(&mdsc->cap_dirty_lock);
2280 if (!list_empty(&mdsc->cap_flush_list)) {
2281 struct ceph_cap_flush *cf =
2282 list_first_entry(&mdsc->cap_flush_list,
2283 struct ceph_cap_flush, g_list);
2284 if (cf->tid <= want_flush_tid) {
2285 doutc(cl, "still flushing tid %llu <= %llu\n",
2286 cf->tid, want_flush_tid);
2287 ret = 0;
2288 }
2289 }
2290 spin_unlock(&mdsc->cap_dirty_lock);
2291 return ret;
2292 }
2293
2294 /*
2295 * flush all dirty inode data to disk.
2296 *
2297 * returns true if we've flushed through want_flush_tid
2298 */
2299 static void wait_caps_flush(struct ceph_mds_client *mdsc,
2300 u64 want_flush_tid)
2301 {
2302 struct ceph_client *cl = mdsc->fsc->client;
2303
2304 doutc(cl, "want %llu\n", want_flush_tid);
2305
2306 wait_event(mdsc->cap_flushing_wq,
2307 check_caps_flush(mdsc, want_flush_tid));
2308
2309 doutc(cl, "ok, flushed thru %llu\n", want_flush_tid);
2310 }
2311
2312 /*
2313 * called under s_mutex
2314 */
2315 static void ceph_send_cap_releases(struct ceph_mds_client *mdsc,
2316 struct ceph_mds_session *session)
2317 {
2318 struct ceph_client *cl = mdsc->fsc->client;
2319 struct ceph_msg *msg = NULL;
2320 struct ceph_mds_cap_release *head;
2321 struct ceph_mds_cap_item *item;
2322 struct ceph_osd_client *osdc = &mdsc->fsc->client->osdc;
2323 struct ceph_cap *cap;
2324 LIST_HEAD(tmp_list);
2325 int num_cap_releases;
2326 __le32 barrier, *cap_barrier;
2327
2328 down_read(&osdc->lock);
2329 barrier = cpu_to_le32(osdc->epoch_barrier);
2330 up_read(&osdc->lock);
2331
2332 spin_lock(&session->s_cap_lock);
2333 again:
2334 list_splice_init(&session->s_cap_releases, &tmp_list);
2335 num_cap_releases = session->s_num_cap_releases;
2336 session->s_num_cap_releases = 0;
2337 spin_unlock(&session->s_cap_lock);
2338
2339 while (!list_empty(&tmp_list)) {
2340 if (!msg) {
2341 msg = ceph_msg_new(CEPH_MSG_CLIENT_CAPRELEASE,
2342 PAGE_SIZE, GFP_NOFS, false);
2343 if (!msg)
2344 goto out_err;
2345 head = msg->front.iov_base;
2346 head->num = cpu_to_le32(0);
2347 msg->front.iov_len = sizeof(*head);
2348
2349 msg->hdr.version = cpu_to_le16(2);
2350 msg->hdr.compat_version = cpu_to_le16(1);
2351 }
2352
2353 cap = list_first_entry(&tmp_list, struct ceph_cap,
2354 session_caps);
2355 list_del(&cap->session_caps);
2356 num_cap_releases--;
2357
2358 head = msg->front.iov_base;
2359 put_unaligned_le32(get_unaligned_le32(&head->num) + 1,
2360 &head->num);
2361 item = msg->front.iov_base + msg->front.iov_len;
2362 item->ino = cpu_to_le64(cap->cap_ino);
2363 item->cap_id = cpu_to_le64(cap->cap_id);
2364 item->migrate_seq = cpu_to_le32(cap->mseq);
2365 item->seq = cpu_to_le32(cap->issue_seq);
2366 msg->front.iov_len += sizeof(*item);
2367
2368 ceph_put_cap(mdsc, cap);
2369
2370 if (le32_to_cpu(head->num) == CEPH_CAPS_PER_RELEASE) {
2371 // Append cap_barrier field
2372 cap_barrier = msg->front.iov_base + msg->front.iov_len;
2373 *cap_barrier = barrier;
2374 msg->front.iov_len += sizeof(*cap_barrier);
2375
2376 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
2377 doutc(cl, "mds%d %p\n", session->s_mds, msg);
2378 ceph_con_send(&session->s_con, msg);
2379 msg = NULL;
2380 }
2381 }
2382
2383 BUG_ON(num_cap_releases != 0);
2384
2385 spin_lock(&session->s_cap_lock);
2386 if (!list_empty(&session->s_cap_releases))
2387 goto again;
2388 spin_unlock(&session->s_cap_lock);
2389
2390 if (msg) {
2391 // Append cap_barrier field
2392 cap_barrier = msg->front.iov_base + msg->front.iov_len;
2393 *cap_barrier = barrier;
2394 msg->front.iov_len += sizeof(*cap_barrier);
2395
2396 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
2397 doutc(cl, "mds%d %p\n", session->s_mds, msg);
2398 ceph_con_send(&session->s_con, msg);
2399 }
2400 return;
2401 out_err:
2402 pr_err_client(cl, "mds%d, failed to allocate message\n",
2403 session->s_mds);
2404 spin_lock(&session->s_cap_lock);
2405 list_splice(&tmp_list, &session->s_cap_releases);
2406 session->s_num_cap_releases += num_cap_releases;
2407 spin_unlock(&session->s_cap_lock);
2408 }
2409
2410 static void ceph_cap_release_work(struct work_struct *work)
2411 {
2412 struct ceph_mds_session *session =
2413 container_of(work, struct ceph_mds_session, s_cap_release_work);
2414
2415 mutex_lock(&session->s_mutex);
2416 if (session->s_state == CEPH_MDS_SESSION_OPEN ||
2417 session->s_state == CEPH_MDS_SESSION_HUNG)
2418 ceph_send_cap_releases(session->s_mdsc, session);
2419 mutex_unlock(&session->s_mutex);
2420 ceph_put_mds_session(session);
2421 }
2422
2423 void ceph_flush_cap_releases(struct ceph_mds_client *mdsc,
2424 struct ceph_mds_session *session)
2425 {
2426 struct ceph_client *cl = mdsc->fsc->client;
2427 if (mdsc->stopping)
2428 return;
2429
2430 ceph_get_mds_session(session);
2431 if (queue_work(mdsc->fsc->cap_wq,
2432 &session->s_cap_release_work)) {
2433 doutc(cl, "cap release work queued\n");
2434 } else {
2435 ceph_put_mds_session(session);
2436 doutc(cl, "failed to queue cap release work\n");
2437 }
2438 }
2439
2440 /*
2441 * caller holds session->s_cap_lock
2442 */
2443 void __ceph_queue_cap_release(struct ceph_mds_session *session,
2444 struct ceph_cap *cap)
2445 {
2446 list_add_tail(&cap->session_caps, &session->s_cap_releases);
2447 session->s_num_cap_releases++;
2448
2449 if (!(session->s_num_cap_releases % CEPH_CAPS_PER_RELEASE))
2450 ceph_flush_cap_releases(session->s_mdsc, session);
2451 }
2452
2453 static void ceph_cap_reclaim_work(struct work_struct *work)
2454 {
2455 struct ceph_mds_client *mdsc =
2456 container_of(work, struct ceph_mds_client, cap_reclaim_work);
2457 int ret = ceph_trim_dentries(mdsc);
2458 if (ret == -EAGAIN)
2459 ceph_queue_cap_reclaim_work(mdsc);
2460 }
2461
2462 void ceph_queue_cap_reclaim_work(struct ceph_mds_client *mdsc)
2463 {
2464 struct ceph_client *cl = mdsc->fsc->client;
2465 if (mdsc->stopping)
2466 return;
2467
2468 if (queue_work(mdsc->fsc->cap_wq, &mdsc->cap_reclaim_work)) {
2469 doutc(cl, "caps reclaim work queued\n");
2470 } else {
2471 doutc(cl, "failed to queue caps release work\n");
2472 }
2473 }
2474
2475 void ceph_reclaim_caps_nr(struct ceph_mds_client *mdsc, int nr)
2476 {
2477 int val;
2478 if (!nr)
2479 return;
2480 val = atomic_add_return(nr, &mdsc->cap_reclaim_pending);
2481 if ((val % CEPH_CAPS_PER_RELEASE) < nr) {
2482 atomic_set(&mdsc->cap_reclaim_pending, 0);
2483 ceph_queue_cap_reclaim_work(mdsc);
2484 }
2485 }
2486
2487 void ceph_queue_cap_unlink_work(struct ceph_mds_client *mdsc)
2488 {
2489 struct ceph_client *cl = mdsc->fsc->client;
2490 if (mdsc->stopping)
2491 return;
2492
2493 if (queue_work(mdsc->fsc->cap_wq, &mdsc->cap_unlink_work)) {
2494 doutc(cl, "caps unlink work queued\n");
2495 } else {
2496 doutc(cl, "failed to queue caps unlink work\n");
2497 }
2498 }
2499
2500 static void ceph_cap_unlink_work(struct work_struct *work)
2501 {
2502 struct ceph_mds_client *mdsc =
2503 container_of(work, struct ceph_mds_client, cap_unlink_work);
2504 struct ceph_client *cl = mdsc->fsc->client;
2505
2506 doutc(cl, "begin\n");
2507 spin_lock(&mdsc->cap_delay_lock);
2508 while (!list_empty(&mdsc->cap_unlink_delay_list)) {
2509 struct ceph_inode_info *ci;
2510 struct inode *inode;
2511
2512 ci = list_first_entry(&mdsc->cap_unlink_delay_list,
2513 struct ceph_inode_info,
2514 i_cap_delay_list);
2515 list_del_init(&ci->i_cap_delay_list);
2516
2517 inode = igrab(&ci->netfs.inode);
2518 if (inode) {
2519 spin_unlock(&mdsc->cap_delay_lock);
2520 doutc(cl, "on %p %llx.%llx\n", inode,
2521 ceph_vinop(inode));
2522 ceph_check_caps(ci, CHECK_CAPS_FLUSH);
2523 iput(inode);
2524 spin_lock(&mdsc->cap_delay_lock);
2525 }
2526 }
2527 spin_unlock(&mdsc->cap_delay_lock);
2528 doutc(cl, "done\n");
2529 }
2530
2531 /*
2532 * requests
2533 */
2534
2535 int ceph_alloc_readdir_reply_buffer(struct ceph_mds_request *req,
2536 struct inode *dir)
2537 {
2538 struct ceph_inode_info *ci = ceph_inode(dir);
2539 struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
2540 struct ceph_mount_options *opt = req->r_mdsc->fsc->mount_options;
2541 size_t size = sizeof(struct ceph_mds_reply_dir_entry);
2542 unsigned int num_entries;
2543 int order;
2544
2545 spin_lock(&ci->i_ceph_lock);
2546 num_entries = ci->i_files + ci->i_subdirs;
2547 spin_unlock(&ci->i_ceph_lock);
2548 num_entries = max(num_entries, 1U);
2549 num_entries = min(num_entries, opt->max_readdir);
2550
2551 order = get_order(size * num_entries);
2552 while (order >= 0) {
2553 rinfo->dir_entries = (void*)__get_free_pages(GFP_KERNEL |
2554 __GFP_NOWARN |
2555 __GFP_ZERO,
2556 order);
2557 if (rinfo->dir_entries)
2558 break;
2559 order--;
2560 }
2561 if (!rinfo->dir_entries)
2562 return -ENOMEM;
2563
2564 num_entries = (PAGE_SIZE << order) / size;
2565 num_entries = min(num_entries, opt->max_readdir);
2566
2567 rinfo->dir_buf_size = PAGE_SIZE << order;
2568 req->r_num_caps = num_entries + 1;
2569 req->r_args.readdir.max_entries = cpu_to_le32(num_entries);
2570 req->r_args.readdir.max_bytes = cpu_to_le32(opt->max_readdir_bytes);
2571 return 0;
2572 }
2573
2574 /*
2575 * Create an mds request.
2576 */
2577 struct ceph_mds_request *
2578 ceph_mdsc_create_request(struct ceph_mds_client *mdsc, int op, int mode)
2579 {
2580 struct ceph_mds_request *req;
2581
2582 req = kmem_cache_zalloc(ceph_mds_request_cachep, GFP_NOFS);
2583 if (!req)
2584 return ERR_PTR(-ENOMEM);
2585
2586 mutex_init(&req->r_fill_mutex);
2587 req->r_mdsc = mdsc;
2588 req->r_started = jiffies;
2589 req->r_start_latency = ktime_get();
2590 req->r_resend_mds = -1;
2591 INIT_LIST_HEAD(&req->r_unsafe_dir_item);
2592 INIT_LIST_HEAD(&req->r_unsafe_target_item);
2593 req->r_fmode = -1;
2594 req->r_feature_needed = -1;
2595 kref_init(&req->r_kref);
2596 RB_CLEAR_NODE(&req->r_node);
2597 INIT_LIST_HEAD(&req->r_wait);
2598 init_completion(&req->r_completion);
2599 init_completion(&req->r_safe_completion);
2600 INIT_LIST_HEAD(&req->r_unsafe_item);
2601
2602 ktime_get_coarse_real_ts64(&req->r_stamp);
2603
2604 req->r_op = op;
2605 req->r_direct_mode = mode;
2606 return req;
2607 }
2608
2609 /*
2610 * return oldest (lowest) request, tid in request tree, 0 if none.
2611 *
2612 * called under mdsc->mutex.
2613 */
2614 static struct ceph_mds_request *__get_oldest_req(struct ceph_mds_client *mdsc)
2615 {
2616 if (RB_EMPTY_ROOT(&mdsc->request_tree))
2617 return NULL;
2618 return rb_entry(rb_first(&mdsc->request_tree),
2619 struct ceph_mds_request, r_node);
2620 }
2621
2622 static inline u64 __get_oldest_tid(struct ceph_mds_client *mdsc)
2623 {
2624 return mdsc->oldest_tid;
2625 }
2626
2627 #if IS_ENABLED(CONFIG_FS_ENCRYPTION)
2628 static u8 *get_fscrypt_altname(const struct ceph_mds_request *req, u32 *plen)
2629 {
2630 struct inode *dir = req->r_parent;
2631 struct dentry *dentry = req->r_dentry;
2632 u8 *cryptbuf = NULL;
2633 u32 len = 0;
2634 int ret = 0;
2635
2636 /* only encode if we have parent and dentry */
2637 if (!dir || !dentry)
2638 goto success;
2639
2640 /* No-op unless this is encrypted */
2641 if (!IS_ENCRYPTED(dir))
2642 goto success;
2643
2644 ret = ceph_fscrypt_prepare_readdir(dir);
2645 if (ret < 0)
2646 return ERR_PTR(ret);
2647
2648 /* No key? Just ignore it. */
2649 if (!fscrypt_has_encryption_key(dir))
2650 goto success;
2651
2652 if (!fscrypt_fname_encrypted_size(dir, dentry->d_name.len, NAME_MAX,
2653 &len)) {
2654 WARN_ON_ONCE(1);
2655 return ERR_PTR(-ENAMETOOLONG);
2656 }
2657
2658 /* No need to append altname if name is short enough */
2659 if (len <= CEPH_NOHASH_NAME_MAX) {
2660 len = 0;
2661 goto success;
2662 }
2663
2664 cryptbuf = kmalloc(len, GFP_KERNEL);
2665 if (!cryptbuf)
2666 return ERR_PTR(-ENOMEM);
2667
2668 ret = fscrypt_fname_encrypt(dir, &dentry->d_name, cryptbuf, len);
2669 if (ret) {
2670 kfree(cryptbuf);
2671 return ERR_PTR(ret);
2672 }
2673 success:
2674 *plen = len;
2675 return cryptbuf;
2676 }
2677 #else
2678 static u8 *get_fscrypt_altname(const struct ceph_mds_request *req, u32 *plen)
2679 {
2680 *plen = 0;
2681 return NULL;
2682 }
2683 #endif
2684
2685 /**
2686 * ceph_mdsc_build_path - build a path string to a given dentry
2687 * @mdsc: mds client
2688 * @dentry: dentry to which path should be built
2689 * @plen: returned length of string
2690 * @pbase: returned base inode number
2691 * @for_wire: is this path going to be sent to the MDS?
2692 *
2693 * Build a string that represents the path to the dentry. This is mostly called
2694 * for two different purposes:
2695 *
2696 * 1) we need to build a path string to send to the MDS (for_wire == true)
2697 * 2) we need a path string for local presentation (e.g. debugfs)
2698 * (for_wire == false)
2699 *
2700 * The path is built in reverse, starting with the dentry. Walk back up toward
2701 * the root, building the path until the first non-snapped inode is reached
2702 * (for_wire) or the root inode is reached (!for_wire).
2703 *
2704 * Encode hidden .snap dirs as a double /, i.e.
2705 * foo/.snap/bar -> foo//bar
2706 */
2707 char *ceph_mdsc_build_path(struct ceph_mds_client *mdsc, struct dentry *dentry,
2708 int *plen, u64 *pbase, int for_wire)
2709 {
2710 struct ceph_client *cl = mdsc->fsc->client;
2711 struct dentry *cur;
2712 struct inode *inode;
2713 char *path;
2714 int pos;
2715 unsigned seq;
2716 u64 base;
2717
2718 if (!dentry)
2719 return ERR_PTR(-EINVAL);
2720
2721 path = __getname();
2722 if (!path)
2723 return ERR_PTR(-ENOMEM);
2724 retry:
2725 pos = PATH_MAX - 1;
2726 path[pos] = '\0';
2727
2728 seq = read_seqbegin(&rename_lock);
2729 cur = dget(dentry);
2730 for (;;) {
2731 struct dentry *parent;
2732
2733 spin_lock(&cur->d_lock);
2734 inode = d_inode(cur);
2735 if (inode && ceph_snap(inode) == CEPH_SNAPDIR) {
2736 doutc(cl, "path+%d: %p SNAPDIR\n", pos, cur);
2737 spin_unlock(&cur->d_lock);
2738 parent = dget_parent(cur);
2739 } else if (for_wire && inode && dentry != cur &&
2740 ceph_snap(inode) == CEPH_NOSNAP) {
2741 spin_unlock(&cur->d_lock);
2742 pos++; /* get rid of any prepended '/' */
2743 break;
2744 } else if (!for_wire || !IS_ENCRYPTED(d_inode(cur->d_parent))) {
2745 pos -= cur->d_name.len;
2746 if (pos < 0) {
2747 spin_unlock(&cur->d_lock);
2748 break;
2749 }
2750 memcpy(path + pos, cur->d_name.name, cur->d_name.len);
2751 spin_unlock(&cur->d_lock);
2752 parent = dget_parent(cur);
2753 } else {
2754 int len, ret;
2755 char buf[NAME_MAX];
2756
2757 /*
2758 * Proactively copy name into buf, in case we need to
2759 * present it as-is.
2760 */
2761 memcpy(buf, cur->d_name.name, cur->d_name.len);
2762 len = cur->d_name.len;
2763 spin_unlock(&cur->d_lock);
2764 parent = dget_parent(cur);
2765
2766 ret = ceph_fscrypt_prepare_readdir(d_inode(parent));
2767 if (ret < 0) {
2768 dput(parent);
2769 dput(cur);
2770 return ERR_PTR(ret);
2771 }
2772
2773 if (fscrypt_has_encryption_key(d_inode(parent))) {
2774 len = ceph_encode_encrypted_fname(d_inode(parent),
2775 cur, buf);
2776 if (len < 0) {
2777 dput(parent);
2778 dput(cur);
2779 return ERR_PTR(len);
2780 }
2781 }
2782 pos -= len;
2783 if (pos < 0) {
2784 dput(parent);
2785 break;
2786 }
2787 memcpy(path + pos, buf, len);
2788 }
2789 dput(cur);
2790 cur = parent;
2791
2792 /* Are we at the root? */
2793 if (IS_ROOT(cur))
2794 break;
2795
2796 /* Are we out of buffer? */
2797 if (--pos < 0)
2798 break;
2799
2800 path[pos] = '/';
2801 }
2802 inode = d_inode(cur);
2803 base = inode ? ceph_ino(inode) : 0;
2804 dput(cur);
2805
2806 if (read_seqretry(&rename_lock, seq))
2807 goto retry;
2808
2809 if (pos < 0) {
2810 /*
2811 * A rename didn't occur, but somehow we didn't end up where
2812 * we thought we would. Throw a warning and try again.
2813 */
2814 pr_warn_client(cl, "did not end path lookup where expected (pos = %d)\n",
2815 pos);
2816 goto retry;
2817 }
2818
2819 *pbase = base;
2820 *plen = PATH_MAX - 1 - pos;
2821 doutc(cl, "on %p %d built %llx '%.*s'\n", dentry, d_count(dentry),
2822 base, *plen, path + pos);
2823 return path + pos;
2824 }
2825
2826 static int build_dentry_path(struct ceph_mds_client *mdsc, struct dentry *dentry,
2827 struct inode *dir, const char **ppath, int *ppathlen,
2828 u64 *pino, bool *pfreepath, bool parent_locked)
2829 {
2830 char *path;
2831
2832 rcu_read_lock();
2833 if (!dir)
2834 dir = d_inode_rcu(dentry->d_parent);
2835 if (dir && parent_locked && ceph_snap(dir) == CEPH_NOSNAP &&
2836 !IS_ENCRYPTED(dir)) {
2837 *pino = ceph_ino(dir);
2838 rcu_read_unlock();
2839 *ppath = dentry->d_name.name;
2840 *ppathlen = dentry->d_name.len;
2841 return 0;
2842 }
2843 rcu_read_unlock();
2844 path = ceph_mdsc_build_path(mdsc, dentry, ppathlen, pino, 1);
2845 if (IS_ERR(path))
2846 return PTR_ERR(path);
2847 *ppath = path;
2848 *pfreepath = true;
2849 return 0;
2850 }
2851
2852 static int build_inode_path(struct inode *inode,
2853 const char **ppath, int *ppathlen, u64 *pino,
2854 bool *pfreepath)
2855 {
2856 struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(inode->i_sb);
2857 struct dentry *dentry;
2858 char *path;
2859
2860 if (ceph_snap(inode) == CEPH_NOSNAP) {
2861 *pino = ceph_ino(inode);
2862 *ppathlen = 0;
2863 return 0;
2864 }
2865 dentry = d_find_alias(inode);
2866 path = ceph_mdsc_build_path(mdsc, dentry, ppathlen, pino, 1);
2867 dput(dentry);
2868 if (IS_ERR(path))
2869 return PTR_ERR(path);
2870 *ppath = path;
2871 *pfreepath = true;
2872 return 0;
2873 }
2874
2875 /*
2876 * request arguments may be specified via an inode *, a dentry *, or
2877 * an explicit ino+path.
2878 */
2879 static int set_request_path_attr(struct ceph_mds_client *mdsc, struct inode *rinode,
2880 struct dentry *rdentry, struct inode *rdiri,
2881 const char *rpath, u64 rino, const char **ppath,
2882 int *pathlen, u64 *ino, bool *freepath,
2883 bool parent_locked)
2884 {
2885 struct ceph_client *cl = mdsc->fsc->client;
2886 int r = 0;
2887
2888 if (rinode) {
2889 r = build_inode_path(rinode, ppath, pathlen, ino, freepath);
2890 doutc(cl, " inode %p %llx.%llx\n", rinode, ceph_ino(rinode),
2891 ceph_snap(rinode));
2892 } else if (rdentry) {
2893 r = build_dentry_path(mdsc, rdentry, rdiri, ppath, pathlen, ino,
2894 freepath, parent_locked);
2895 doutc(cl, " dentry %p %llx/%.*s\n", rdentry, *ino, *pathlen, *ppath);
2896 } else if (rpath || rino) {
2897 *ino = rino;
2898 *ppath = rpath;
2899 *pathlen = rpath ? strlen(rpath) : 0;
2900 doutc(cl, " path %.*s\n", *pathlen, rpath);
2901 }
2902
2903 return r;
2904 }
2905
2906 static void encode_mclientrequest_tail(void **p,
2907 const struct ceph_mds_request *req)
2908 {
2909 struct ceph_timespec ts;
2910 int i;
2911
2912 ceph_encode_timespec64(&ts, &req->r_stamp);
2913 ceph_encode_copy(p, &ts, sizeof(ts));
2914
2915 /* v4: gid_list */
2916 ceph_encode_32(p, req->r_cred->group_info->ngroups);
2917 for (i = 0; i < req->r_cred->group_info->ngroups; i++)
2918 ceph_encode_64(p, from_kgid(&init_user_ns,
2919 req->r_cred->group_info->gid[i]));
2920
2921 /* v5: altname */
2922 ceph_encode_32(p, req->r_altname_len);
2923 ceph_encode_copy(p, req->r_altname, req->r_altname_len);
2924
2925 /* v6: fscrypt_auth and fscrypt_file */
2926 if (req->r_fscrypt_auth) {
2927 u32 authlen = ceph_fscrypt_auth_len(req->r_fscrypt_auth);
2928
2929 ceph_encode_32(p, authlen);
2930 ceph_encode_copy(p, req->r_fscrypt_auth, authlen);
2931 } else {
2932 ceph_encode_32(p, 0);
2933 }
2934 if (test_bit(CEPH_MDS_R_FSCRYPT_FILE, &req->r_req_flags)) {
2935 ceph_encode_32(p, sizeof(__le64));
2936 ceph_encode_64(p, req->r_fscrypt_file);
2937 } else {
2938 ceph_encode_32(p, 0);
2939 }
2940 }
2941
2942 static inline u16 mds_supported_head_version(struct ceph_mds_session *session)
2943 {
2944 if (!test_bit(CEPHFS_FEATURE_32BITS_RETRY_FWD, &session->s_features))
2945 return 1;
2946
2947 if (!test_bit(CEPHFS_FEATURE_HAS_OWNER_UIDGID, &session->s_features))
2948 return 2;
2949
2950 return CEPH_MDS_REQUEST_HEAD_VERSION;
2951 }
2952
2953 static struct ceph_mds_request_head_legacy *
2954 find_legacy_request_head(void *p, u64 features)
2955 {
2956 bool legacy = !(features & CEPH_FEATURE_FS_BTIME);
2957 struct ceph_mds_request_head_old *ohead;
2958
2959 if (legacy)
2960 return (struct ceph_mds_request_head_legacy *)p;
2961 ohead = (struct ceph_mds_request_head_old *)p;
2962 return (struct ceph_mds_request_head_legacy *)&ohead->oldest_client_tid;
2963 }
2964
2965 /*
2966 * called under mdsc->mutex
2967 */
2968 static struct ceph_msg *create_request_message(struct ceph_mds_session *session,
2969 struct ceph_mds_request *req,
2970 bool drop_cap_releases)
2971 {
2972 int mds = session->s_mds;
2973 struct ceph_mds_client *mdsc = session->s_mdsc;
2974 struct ceph_client *cl = mdsc->fsc->client;
2975 struct ceph_msg *msg;
2976 struct ceph_mds_request_head_legacy *lhead;
2977 const char *path1 = NULL;
2978 const char *path2 = NULL;
2979 u64 ino1 = 0, ino2 = 0;
2980 int pathlen1 = 0, pathlen2 = 0;
2981 bool freepath1 = false, freepath2 = false;
2982 struct dentry *old_dentry = NULL;
2983 int len;
2984 u16 releases;
2985 void *p, *end;
2986 int ret;
2987 bool legacy = !(session->s_con.peer_features & CEPH_FEATURE_FS_BTIME);
2988 u16 request_head_version = mds_supported_head_version(session);
2989 kuid_t caller_fsuid = req->r_cred->fsuid;
2990 kgid_t caller_fsgid = req->r_cred->fsgid;
2991
2992 ret = set_request_path_attr(mdsc, req->r_inode, req->r_dentry,
2993 req->r_parent, req->r_path1, req->r_ino1.ino,
2994 &path1, &pathlen1, &ino1, &freepath1,
2995 test_bit(CEPH_MDS_R_PARENT_LOCKED,
2996 &req->r_req_flags));
2997 if (ret < 0) {
2998 msg = ERR_PTR(ret);
2999 goto out;
3000 }
3001
3002 /* If r_old_dentry is set, then assume that its parent is locked */
3003 if (req->r_old_dentry &&
3004 !(req->r_old_dentry->d_flags & DCACHE_DISCONNECTED))
3005 old_dentry = req->r_old_dentry;
3006 ret = set_request_path_attr(mdsc, NULL, old_dentry,
3007 req->r_old_dentry_dir,
3008 req->r_path2, req->r_ino2.ino,
3009 &path2, &pathlen2, &ino2, &freepath2, true);
3010 if (ret < 0) {
3011 msg = ERR_PTR(ret);
3012 goto out_free1;
3013 }
3014
3015 req->r_altname = get_fscrypt_altname(req, &req->r_altname_len);
3016 if (IS_ERR(req->r_altname)) {
3017 msg = ERR_CAST(req->r_altname);
3018 req->r_altname = NULL;
3019 goto out_free2;
3020 }
3021
3022 /*
3023 * For old cephs without supporting the 32bit retry/fwd feature
3024 * it will copy the raw memories directly when decoding the
3025 * requests. While new cephs will decode the head depending the
3026 * version member, so we need to make sure it will be compatible
3027 * with them both.
3028 */
3029 if (legacy)
3030 len = sizeof(struct ceph_mds_request_head_legacy);
3031 else if (request_head_version == 1)
3032 len = sizeof(struct ceph_mds_request_head_old);
3033 else if (request_head_version == 2)
3034 len = offsetofend(struct ceph_mds_request_head, ext_num_fwd);
3035 else
3036 len = sizeof(struct ceph_mds_request_head);
3037
3038 /* filepaths */
3039 len += 2 * (1 + sizeof(u32) + sizeof(u64));
3040 len += pathlen1 + pathlen2;
3041
3042 /* cap releases */
3043 len += sizeof(struct ceph_mds_request_release) *
3044 (!!req->r_inode_drop + !!req->r_dentry_drop +
3045 !!req->r_old_inode_drop + !!req->r_old_dentry_drop);
3046
3047 if (req->r_dentry_drop)
3048 len += pathlen1;
3049 if (req->r_old_dentry_drop)
3050 len += pathlen2;
3051
3052 /* MClientRequest tail */
3053
3054 /* req->r_stamp */
3055 len += sizeof(struct ceph_timespec);
3056
3057 /* gid list */
3058 len += sizeof(u32) + (sizeof(u64) * req->r_cred->group_info->ngroups);
3059
3060 /* alternate name */
3061 len += sizeof(u32) + req->r_altname_len;
3062
3063 /* fscrypt_auth */
3064 len += sizeof(u32); // fscrypt_auth
3065 if (req->r_fscrypt_auth)
3066 len += ceph_fscrypt_auth_len(req->r_fscrypt_auth);
3067
3068 /* fscrypt_file */
3069 len += sizeof(u32);
3070 if (test_bit(CEPH_MDS_R_FSCRYPT_FILE, &req->r_req_flags))
3071 len += sizeof(__le64);
3072
3073 msg = ceph_msg_new2(CEPH_MSG_CLIENT_REQUEST, len, 1, GFP_NOFS, false);
3074 if (!msg) {
3075 msg = ERR_PTR(-ENOMEM);
3076 goto out_free2;
3077 }
3078
3079 msg->hdr.tid = cpu_to_le64(req->r_tid);
3080
3081 lhead = find_legacy_request_head(msg->front.iov_base,
3082 session->s_con.peer_features);
3083
3084 if ((req->r_mnt_idmap != &nop_mnt_idmap) &&
3085 !test_bit(CEPHFS_FEATURE_HAS_OWNER_UIDGID, &session->s_features)) {
3086 WARN_ON_ONCE(!IS_CEPH_MDS_OP_NEWINODE(req->r_op));
3087
3088 if (enable_unsafe_idmap) {
3089 pr_warn_once_client(cl,
3090 "idmapped mount is used and CEPHFS_FEATURE_HAS_OWNER_UIDGID"
3091 " is not supported by MDS. UID/GID-based restrictions may"
3092 " not work properly.\n");
3093
3094 caller_fsuid = from_vfsuid(req->r_mnt_idmap, &init_user_ns,
3095 VFSUIDT_INIT(req->r_cred->fsuid));
3096 caller_fsgid = from_vfsgid(req->r_mnt_idmap, &init_user_ns,
3097 VFSGIDT_INIT(req->r_cred->fsgid));
3098 } else {
3099 pr_err_ratelimited_client(cl,
3100 "idmapped mount is used and CEPHFS_FEATURE_HAS_OWNER_UIDGID"
3101 " is not supported by MDS. Fail request with -EIO.\n");
3102
3103 ret = -EIO;
3104 goto out_err;
3105 }
3106 }
3107
3108 /*
3109 * The ceph_mds_request_head_legacy didn't contain a version field, and
3110 * one was added when we moved the message version from 3->4.
3111 */
3112 if (legacy) {
3113 msg->hdr.version = cpu_to_le16(3);
3114 p = msg->front.iov_base + sizeof(*lhead);
3115 } else if (request_head_version == 1) {
3116 struct ceph_mds_request_head_old *ohead = msg->front.iov_base;
3117
3118 msg->hdr.version = cpu_to_le16(4);
3119 ohead->version = cpu_to_le16(1);
3120 p = msg->front.iov_base + sizeof(*ohead);
3121 } else if (request_head_version == 2) {
3122 struct ceph_mds_request_head *nhead = msg->front.iov_base;
3123
3124 msg->hdr.version = cpu_to_le16(6);
3125 nhead->version = cpu_to_le16(2);
3126
3127 p = msg->front.iov_base + offsetofend(struct ceph_mds_request_head, ext_num_fwd);
3128 } else {
3129 struct ceph_mds_request_head *nhead = msg->front.iov_base;
3130 kuid_t owner_fsuid;
3131 kgid_t owner_fsgid;
3132
3133 msg->hdr.version = cpu_to_le16(6);
3134 nhead->version = cpu_to_le16(CEPH_MDS_REQUEST_HEAD_VERSION);
3135 nhead->struct_len = cpu_to_le32(sizeof(struct ceph_mds_request_head));
3136
3137 if (IS_CEPH_MDS_OP_NEWINODE(req->r_op)) {
3138 owner_fsuid = from_vfsuid(req->r_mnt_idmap, &init_user_ns,
3139 VFSUIDT_INIT(req->r_cred->fsuid));
3140 owner_fsgid = from_vfsgid(req->r_mnt_idmap, &init_user_ns,
3141 VFSGIDT_INIT(req->r_cred->fsgid));
3142 nhead->owner_uid = cpu_to_le32(from_kuid(&init_user_ns, owner_fsuid));
3143 nhead->owner_gid = cpu_to_le32(from_kgid(&init_user_ns, owner_fsgid));
3144 } else {
3145 nhead->owner_uid = cpu_to_le32(-1);
3146 nhead->owner_gid = cpu_to_le32(-1);
3147 }
3148
3149 p = msg->front.iov_base + sizeof(*nhead);
3150 }
3151
3152 end = msg->front.iov_base + msg->front.iov_len;
3153
3154 lhead->mdsmap_epoch = cpu_to_le32(mdsc->mdsmap->m_epoch);
3155 lhead->op = cpu_to_le32(req->r_op);
3156 lhead->caller_uid = cpu_to_le32(from_kuid(&init_user_ns,
3157 caller_fsuid));
3158 lhead->caller_gid = cpu_to_le32(from_kgid(&init_user_ns,
3159 caller_fsgid));
3160 lhead->ino = cpu_to_le64(req->r_deleg_ino);
3161 lhead->args = req->r_args;
3162
3163 ceph_encode_filepath(&p, end, ino1, path1);
3164 ceph_encode_filepath(&p, end, ino2, path2);
3165
3166 /* make note of release offset, in case we need to replay */
3167 req->r_request_release_offset = p - msg->front.iov_base;
3168
3169 /* cap releases */
3170 releases = 0;
3171 if (req->r_inode_drop)
3172 releases += ceph_encode_inode_release(&p,
3173 req->r_inode ? req->r_inode : d_inode(req->r_dentry),
3174 mds, req->r_inode_drop, req->r_inode_unless,
3175 req->r_op == CEPH_MDS_OP_READDIR);
3176 if (req->r_dentry_drop) {
3177 ret = ceph_encode_dentry_release(&p, req->r_dentry,
3178 req->r_parent, mds, req->r_dentry_drop,
3179 req->r_dentry_unless);
3180 if (ret < 0)
3181 goto out_err;
3182 releases += ret;
3183 }
3184 if (req->r_old_dentry_drop) {
3185 ret = ceph_encode_dentry_release(&p, req->r_old_dentry,
3186 req->r_old_dentry_dir, mds,
3187 req->r_old_dentry_drop,
3188 req->r_old_dentry_unless);
3189 if (ret < 0)
3190 goto out_err;
3191 releases += ret;
3192 }
3193 if (req->r_old_inode_drop)
3194 releases += ceph_encode_inode_release(&p,
3195 d_inode(req->r_old_dentry),
3196 mds, req->r_old_inode_drop, req->r_old_inode_unless, 0);
3197
3198 if (drop_cap_releases) {
3199 releases = 0;
3200 p = msg->front.iov_base + req->r_request_release_offset;
3201 }
3202
3203 lhead->num_releases = cpu_to_le16(releases);
3204
3205 encode_mclientrequest_tail(&p, req);
3206
3207 if (WARN_ON_ONCE(p > end)) {
3208 ceph_msg_put(msg);
3209 msg = ERR_PTR(-ERANGE);
3210 goto out_free2;
3211 }
3212
3213 msg->front.iov_len = p - msg->front.iov_base;
3214 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
3215
3216 if (req->r_pagelist) {
3217 struct ceph_pagelist *pagelist = req->r_pagelist;
3218 ceph_msg_data_add_pagelist(msg, pagelist);
3219 msg->hdr.data_len = cpu_to_le32(pagelist->length);
3220 } else {
3221 msg->hdr.data_len = 0;
3222 }
3223
3224 msg->hdr.data_off = cpu_to_le16(0);
3225
3226 out_free2:
3227 if (freepath2)
3228 ceph_mdsc_free_path((char *)path2, pathlen2);
3229 out_free1:
3230 if (freepath1)
3231 ceph_mdsc_free_path((char *)path1, pathlen1);
3232 out:
3233 return msg;
3234 out_err:
3235 ceph_msg_put(msg);
3236 msg = ERR_PTR(ret);
3237 goto out_free2;
3238 }
3239
3240 /*
3241 * called under mdsc->mutex if error, under no mutex if
3242 * success.
3243 */
3244 static void complete_request(struct ceph_mds_client *mdsc,
3245 struct ceph_mds_request *req)
3246 {
3247 req->r_end_latency = ktime_get();
3248
3249 if (req->r_callback)
3250 req->r_callback(mdsc, req);
3251 complete_all(&req->r_completion);
3252 }
3253
3254 /*
3255 * called under mdsc->mutex
3256 */
3257 static int __prepare_send_request(struct ceph_mds_session *session,
3258 struct ceph_mds_request *req,
3259 bool drop_cap_releases)
3260 {
3261 int mds = session->s_mds;
3262 struct ceph_mds_client *mdsc = session->s_mdsc;
3263 struct ceph_client *cl = mdsc->fsc->client;
3264 struct ceph_mds_request_head_legacy *lhead;
3265 struct ceph_mds_request_head *nhead;
3266 struct ceph_msg *msg;
3267 int flags = 0, old_max_retry;
3268 bool old_version = !test_bit(CEPHFS_FEATURE_32BITS_RETRY_FWD,
3269 &session->s_features);
3270
3271 /*
3272 * Avoid inifinite retrying after overflow. The client will
3273 * increase the retry count and if the MDS is old version,
3274 * so we limit to retry at most 256 times.
3275 */
3276 if (req->r_attempts) {
3277 old_max_retry = sizeof_field(struct ceph_mds_request_head_old,
3278 num_retry);
3279 old_max_retry = 1 << (old_max_retry * BITS_PER_BYTE);
3280 if ((old_version && req->r_attempts >= old_max_retry) ||
3281 ((uint32_t)req->r_attempts >= U32_MAX)) {
3282 pr_warn_ratelimited_client(cl, "request tid %llu seq overflow\n",
3283 req->r_tid);
3284 return -EMULTIHOP;
3285 }
3286 }
3287
3288 req->r_attempts++;
3289 if (req->r_inode) {
3290 struct ceph_cap *cap =
3291 ceph_get_cap_for_mds(ceph_inode(req->r_inode), mds);
3292
3293 if (cap)
3294 req->r_sent_on_mseq = cap->mseq;
3295 else
3296 req->r_sent_on_mseq = -1;
3297 }
3298 doutc(cl, "%p tid %lld %s (attempt %d)\n", req, req->r_tid,
3299 ceph_mds_op_name(req->r_op), req->r_attempts);
3300
3301 if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) {
3302 void *p;
3303
3304 /*
3305 * Replay. Do not regenerate message (and rebuild
3306 * paths, etc.); just use the original message.
3307 * Rebuilding paths will break for renames because
3308 * d_move mangles the src name.
3309 */
3310 msg = req->r_request;
3311 lhead = find_legacy_request_head(msg->front.iov_base,
3312 session->s_con.peer_features);
3313
3314 flags = le32_to_cpu(lhead->flags);
3315 flags |= CEPH_MDS_FLAG_REPLAY;
3316 lhead->flags = cpu_to_le32(flags);
3317
3318 if (req->r_target_inode)
3319 lhead->ino = cpu_to_le64(ceph_ino(req->r_target_inode));
3320
3321 lhead->num_retry = req->r_attempts - 1;
3322 if (!old_version) {
3323 nhead = (struct ceph_mds_request_head*)msg->front.iov_base;
3324 nhead->ext_num_retry = cpu_to_le32(req->r_attempts - 1);
3325 }
3326
3327 /* remove cap/dentry releases from message */
3328 lhead->num_releases = 0;
3329
3330 p = msg->front.iov_base + req->r_request_release_offset;
3331 encode_mclientrequest_tail(&p, req);
3332
3333 msg->front.iov_len = p - msg->front.iov_base;
3334 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
3335 return 0;
3336 }
3337
3338 if (req->r_request) {
3339 ceph_msg_put(req->r_request);
3340 req->r_request = NULL;
3341 }
3342 msg = create_request_message(session, req, drop_cap_releases);
3343 if (IS_ERR(msg)) {
3344 req->r_err = PTR_ERR(msg);
3345 return PTR_ERR(msg);
3346 }
3347 req->r_request = msg;
3348
3349 lhead = find_legacy_request_head(msg->front.iov_base,
3350 session->s_con.peer_features);
3351 lhead->oldest_client_tid = cpu_to_le64(__get_oldest_tid(mdsc));
3352 if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags))
3353 flags |= CEPH_MDS_FLAG_REPLAY;
3354 if (test_bit(CEPH_MDS_R_ASYNC, &req->r_req_flags))
3355 flags |= CEPH_MDS_FLAG_ASYNC;
3356 if (req->r_parent)
3357 flags |= CEPH_MDS_FLAG_WANT_DENTRY;
3358 lhead->flags = cpu_to_le32(flags);
3359 lhead->num_fwd = req->r_num_fwd;
3360 lhead->num_retry = req->r_attempts - 1;
3361 if (!old_version) {
3362 nhead = (struct ceph_mds_request_head*)msg->front.iov_base;
3363 nhead->ext_num_fwd = cpu_to_le32(req->r_num_fwd);
3364 nhead->ext_num_retry = cpu_to_le32(req->r_attempts - 1);
3365 }
3366
3367 doutc(cl, " r_parent = %p\n", req->r_parent);
3368 return 0;
3369 }
3370
3371 /*
3372 * called under mdsc->mutex
3373 */
3374 static int __send_request(struct ceph_mds_session *session,
3375 struct ceph_mds_request *req,
3376 bool drop_cap_releases)
3377 {
3378 int err;
3379
3380 err = __prepare_send_request(session, req, drop_cap_releases);
3381 if (!err) {
3382 ceph_msg_get(req->r_request);
3383 ceph_con_send(&session->s_con, req->r_request);
3384 }
3385
3386 return err;
3387 }
3388
3389 /*
3390 * send request, or put it on the appropriate wait list.
3391 */
3392 static void __do_request(struct ceph_mds_client *mdsc,
3393 struct ceph_mds_request *req)
3394 {
3395 struct ceph_client *cl = mdsc->fsc->client;
3396 struct ceph_mds_session *session = NULL;
3397 int mds = -1;
3398 int err = 0;
3399 bool random;
3400
3401 if (req->r_err || test_bit(CEPH_MDS_R_GOT_RESULT, &req->r_req_flags)) {
3402 if (test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags))
3403 __unregister_request(mdsc, req);
3404 return;
3405 }
3406
3407 if (READ_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_FENCE_IO) {
3408 doutc(cl, "metadata corrupted\n");
3409 err = -EIO;
3410 goto finish;
3411 }
3412 if (req->r_timeout &&
3413 time_after_eq(jiffies, req->r_started + req->r_timeout)) {
3414 doutc(cl, "timed out\n");
3415 err = -ETIMEDOUT;
3416 goto finish;
3417 }
3418 if (READ_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_SHUTDOWN) {
3419 doutc(cl, "forced umount\n");
3420 err = -EIO;
3421 goto finish;
3422 }
3423 if (READ_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_MOUNTING) {
3424 if (mdsc->mdsmap_err) {
3425 err = mdsc->mdsmap_err;
3426 doutc(cl, "mdsmap err %d\n", err);
3427 goto finish;
3428 }
3429 if (mdsc->mdsmap->m_epoch == 0) {
3430 doutc(cl, "no mdsmap, waiting for map\n");
3431 list_add(&req->r_wait, &mdsc->waiting_for_map);
3432 return;
3433 }
3434 if (!(mdsc->fsc->mount_options->flags &
3435 CEPH_MOUNT_OPT_MOUNTWAIT) &&
3436 !ceph_mdsmap_is_cluster_available(mdsc->mdsmap)) {
3437 err = -EHOSTUNREACH;
3438 goto finish;
3439 }
3440 }
3441
3442 put_request_session(req);
3443
3444 mds = __choose_mds(mdsc, req, &random);
3445 if (mds < 0 ||
3446 ceph_mdsmap_get_state(mdsc->mdsmap, mds) < CEPH_MDS_STATE_ACTIVE) {
3447 if (test_bit(CEPH_MDS_R_ASYNC, &req->r_req_flags)) {
3448 err = -EJUKEBOX;
3449 goto finish;
3450 }
3451 doutc(cl, "no mds or not active, waiting for map\n");
3452 list_add(&req->r_wait, &mdsc->waiting_for_map);
3453 return;
3454 }
3455
3456 /* get, open session */
3457 session = __ceph_lookup_mds_session(mdsc, mds);
3458 if (!session) {
3459 session = register_session(mdsc, mds);
3460 if (IS_ERR(session)) {
3461 err = PTR_ERR(session);
3462 goto finish;
3463 }
3464 }
3465 req->r_session = ceph_get_mds_session(session);
3466
3467 doutc(cl, "mds%d session %p state %s\n", mds, session,
3468 ceph_session_state_name(session->s_state));
3469
3470 /*
3471 * The old ceph will crash the MDSs when see unknown OPs
3472 */
3473 if (req->r_feature_needed > 0 &&
3474 !test_bit(req->r_feature_needed, &session->s_features)) {
3475 err = -EOPNOTSUPP;
3476 goto out_session;
3477 }
3478
3479 if (session->s_state != CEPH_MDS_SESSION_OPEN &&
3480 session->s_state != CEPH_MDS_SESSION_HUNG) {
3481 /*
3482 * We cannot queue async requests since the caps and delegated
3483 * inodes are bound to the session. Just return -EJUKEBOX and
3484 * let the caller retry a sync request in that case.
3485 */
3486 if (test_bit(CEPH_MDS_R_ASYNC, &req->r_req_flags)) {
3487 err = -EJUKEBOX;
3488 goto out_session;
3489 }
3490
3491 /*
3492 * If the session has been REJECTED, then return a hard error,
3493 * unless it's a CLEANRECOVER mount, in which case we'll queue
3494 * it to the mdsc queue.
3495 */
3496 if (session->s_state == CEPH_MDS_SESSION_REJECTED) {
3497 if (ceph_test_mount_opt(mdsc->fsc, CLEANRECOVER))
3498 list_add(&req->r_wait, &mdsc->waiting_for_map);
3499 else
3500 err = -EACCES;
3501 goto out_session;
3502 }
3503
3504 if (session->s_state == CEPH_MDS_SESSION_NEW ||
3505 session->s_state == CEPH_MDS_SESSION_CLOSING) {
3506 err = __open_session(mdsc, session);
3507 if (err)
3508 goto out_session;
3509 /* retry the same mds later */
3510 if (random)
3511 req->r_resend_mds = mds;
3512 }
3513 list_add(&req->r_wait, &session->s_waiting);
3514 goto out_session;
3515 }
3516
3517 /* send request */
3518 req->r_resend_mds = -1; /* forget any previous mds hint */
3519
3520 if (req->r_request_started == 0) /* note request start time */
3521 req->r_request_started = jiffies;
3522
3523 /*
3524 * For async create we will choose the auth MDS of frag in parent
3525 * directory to send the request and ususally this works fine, but
3526 * if the migrated the dirtory to another MDS before it could handle
3527 * it the request will be forwarded.
3528 *
3529 * And then the auth cap will be changed.
3530 */
3531 if (test_bit(CEPH_MDS_R_ASYNC, &req->r_req_flags) && req->r_num_fwd) {
3532 struct ceph_dentry_info *di = ceph_dentry(req->r_dentry);
3533 struct ceph_inode_info *ci;
3534 struct ceph_cap *cap;
3535
3536 /*
3537 * The request maybe handled very fast and the new inode
3538 * hasn't been linked to the dentry yet. We need to wait
3539 * for the ceph_finish_async_create(), which shouldn't be
3540 * stuck too long or fail in thoery, to finish when forwarding
3541 * the request.
3542 */
3543 if (!d_inode(req->r_dentry)) {
3544 err = wait_on_bit(&di->flags, CEPH_DENTRY_ASYNC_CREATE_BIT,
3545 TASK_KILLABLE);
3546 if (err) {
3547 mutex_lock(&req->r_fill_mutex);
3548 set_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags);
3549 mutex_unlock(&req->r_fill_mutex);
3550 goto out_session;
3551 }
3552 }
3553
3554 ci = ceph_inode(d_inode(req->r_dentry));
3555
3556 spin_lock(&ci->i_ceph_lock);
3557 cap = ci->i_auth_cap;
3558 if (ci->i_ceph_flags & CEPH_I_ASYNC_CREATE && mds != cap->mds) {
3559 doutc(cl, "session changed for auth cap %d -> %d\n",
3560 cap->session->s_mds, session->s_mds);
3561
3562 /* Remove the auth cap from old session */
3563 spin_lock(&cap->session->s_cap_lock);
3564 cap->session->s_nr_caps--;
3565 list_del_init(&cap->session_caps);
3566 spin_unlock(&cap->session->s_cap_lock);
3567
3568 /* Add the auth cap to the new session */
3569 cap->mds = mds;
3570 cap->session = session;
3571 spin_lock(&session->s_cap_lock);
3572 session->s_nr_caps++;
3573 list_add_tail(&cap->session_caps, &session->s_caps);
3574 spin_unlock(&session->s_cap_lock);
3575
3576 change_auth_cap_ses(ci, session);
3577 }
3578 spin_unlock(&ci->i_ceph_lock);
3579 }
3580
3581 err = __send_request(session, req, false);
3582
3583 out_session:
3584 ceph_put_mds_session(session);
3585 finish:
3586 if (err) {
3587 doutc(cl, "early error %d\n", err);
3588 req->r_err = err;
3589 complete_request(mdsc, req);
3590 __unregister_request(mdsc, req);
3591 }
3592 return;
3593 }
3594
3595 /*
3596 * called under mdsc->mutex
3597 */
3598 static void __wake_requests(struct ceph_mds_client *mdsc,
3599 struct list_head *head)
3600 {
3601 struct ceph_client *cl = mdsc->fsc->client;
3602 struct ceph_mds_request *req;
3603 LIST_HEAD(tmp_list);
3604
3605 list_splice_init(head, &tmp_list);
3606
3607 while (!list_empty(&tmp_list)) {
3608 req = list_entry(tmp_list.next,
3609 struct ceph_mds_request, r_wait);
3610 list_del_init(&req->r_wait);
3611 doutc(cl, " wake request %p tid %llu\n", req,
3612 req->r_tid);
3613 __do_request(mdsc, req);
3614 }
3615 }
3616
3617 /*
3618 * Wake up threads with requests pending for @mds, so that they can
3619 * resubmit their requests to a possibly different mds.
3620 */
3621 static void kick_requests(struct ceph_mds_client *mdsc, int mds)
3622 {
3623 struct ceph_client *cl = mdsc->fsc->client;
3624 struct ceph_mds_request *req;
3625 struct rb_node *p = rb_first(&mdsc->request_tree);
3626
3627 doutc(cl, "kick_requests mds%d\n", mds);
3628 while (p) {
3629 req = rb_entry(p, struct ceph_mds_request, r_node);
3630 p = rb_next(p);
3631 if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags))
3632 continue;
3633 if (req->r_attempts > 0)
3634 continue; /* only new requests */
3635 if (req->r_session &&
3636 req->r_session->s_mds == mds) {
3637 doutc(cl, " kicking tid %llu\n", req->r_tid);
3638 list_del_init(&req->r_wait);
3639 __do_request(mdsc, req);
3640 }
3641 }
3642 }
3643
3644 int ceph_mdsc_submit_request(struct ceph_mds_client *mdsc, struct inode *dir,
3645 struct ceph_mds_request *req)
3646 {
3647 struct ceph_client *cl = mdsc->fsc->client;
3648 int err = 0;
3649
3650 /* take CAP_PIN refs for r_inode, r_parent, r_old_dentry */
3651 if (req->r_inode)
3652 ceph_get_cap_refs(ceph_inode(req->r_inode), CEPH_CAP_PIN);
3653 if (req->r_parent) {
3654 struct ceph_inode_info *ci = ceph_inode(req->r_parent);
3655 int fmode = (req->r_op & CEPH_MDS_OP_WRITE) ?
3656 CEPH_FILE_MODE_WR : CEPH_FILE_MODE_RD;
3657 spin_lock(&ci->i_ceph_lock);
3658 ceph_take_cap_refs(ci, CEPH_CAP_PIN, false);
3659 __ceph_touch_fmode(ci, mdsc, fmode);
3660 spin_unlock(&ci->i_ceph_lock);
3661 }
3662 if (req->r_old_dentry_dir)
3663 ceph_get_cap_refs(ceph_inode(req->r_old_dentry_dir),
3664 CEPH_CAP_PIN);
3665
3666 if (req->r_inode) {
3667 err = ceph_wait_on_async_create(req->r_inode);
3668 if (err) {
3669 doutc(cl, "wait for async create returned: %d\n", err);
3670 return err;
3671 }
3672 }
3673
3674 if (!err && req->r_old_inode) {
3675 err = ceph_wait_on_async_create(req->r_old_inode);
3676 if (err) {
3677 doutc(cl, "wait for async create returned: %d\n", err);
3678 return err;
3679 }
3680 }
3681
3682 doutc(cl, "submit_request on %p for inode %p\n", req, dir);
3683 mutex_lock(&mdsc->mutex);
3684 __register_request(mdsc, req, dir);
3685 __do_request(mdsc, req);
3686 err = req->r_err;
3687 mutex_unlock(&mdsc->mutex);
3688 return err;
3689 }
3690
3691 int ceph_mdsc_wait_request(struct ceph_mds_client *mdsc,
3692 struct ceph_mds_request *req,
3693 ceph_mds_request_wait_callback_t wait_func)
3694 {
3695 struct ceph_client *cl = mdsc->fsc->client;
3696 int err;
3697
3698 /* wait */
3699 doutc(cl, "do_request waiting\n");
3700 if (wait_func) {
3701 err = wait_func(mdsc, req);
3702 } else {
3703 long timeleft = wait_for_completion_killable_timeout(
3704 &req->r_completion,
3705 ceph_timeout_jiffies(req->r_timeout));
3706 if (timeleft > 0)
3707 err = 0;
3708 else if (!timeleft)
3709 err = -ETIMEDOUT; /* timed out */
3710 else
3711 err = timeleft; /* killed */
3712 }
3713 doutc(cl, "do_request waited, got %d\n", err);
3714 mutex_lock(&mdsc->mutex);
3715
3716 /* only abort if we didn't race with a real reply */
3717 if (test_bit(CEPH_MDS_R_GOT_RESULT, &req->r_req_flags)) {
3718 err = le32_to_cpu(req->r_reply_info.head->result);
3719 } else if (err < 0) {
3720 doutc(cl, "aborted request %lld with %d\n", req->r_tid, err);
3721
3722 /*
3723 * ensure we aren't running concurrently with
3724 * ceph_fill_trace or ceph_readdir_prepopulate, which
3725 * rely on locks (dir mutex) held by our caller.
3726 */
3727 mutex_lock(&req->r_fill_mutex);
3728 req->r_err = err;
3729 set_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags);
3730 mutex_unlock(&req->r_fill_mutex);
3731
3732 if (req->r_parent &&
3733 (req->r_op & CEPH_MDS_OP_WRITE))
3734 ceph_invalidate_dir_request(req);
3735 } else {
3736 err = req->r_err;
3737 }
3738
3739 mutex_unlock(&mdsc->mutex);
3740 return err;
3741 }
3742
3743 /*
3744 * Synchrously perform an mds request. Take care of all of the
3745 * session setup, forwarding, retry details.
3746 */
3747 int ceph_mdsc_do_request(struct ceph_mds_client *mdsc,
3748 struct inode *dir,
3749 struct ceph_mds_request *req)
3750 {
3751 struct ceph_client *cl = mdsc->fsc->client;
3752 int err;
3753
3754 doutc(cl, "do_request on %p\n", req);
3755
3756 /* issue */
3757 err = ceph_mdsc_submit_request(mdsc, dir, req);
3758 if (!err)
3759 err = ceph_mdsc_wait_request(mdsc, req, NULL);
3760 doutc(cl, "do_request %p done, result %d\n", req, err);
3761 return err;
3762 }
3763
3764 /*
3765 * Invalidate dir's completeness, dentry lease state on an aborted MDS
3766 * namespace request.
3767 */
3768 void ceph_invalidate_dir_request(struct ceph_mds_request *req)
3769 {
3770 struct inode *dir = req->r_parent;
3771 struct inode *old_dir = req->r_old_dentry_dir;
3772 struct ceph_client *cl = req->r_mdsc->fsc->client;
3773
3774 doutc(cl, "invalidate_dir_request %p %p (complete, lease(s))\n",
3775 dir, old_dir);
3776
3777 ceph_dir_clear_complete(dir);
3778 if (old_dir)
3779 ceph_dir_clear_complete(old_dir);
3780 if (req->r_dentry)
3781 ceph_invalidate_dentry_lease(req->r_dentry);
3782 if (req->r_old_dentry)
3783 ceph_invalidate_dentry_lease(req->r_old_dentry);
3784 }
3785
3786 /*
3787 * Handle mds reply.
3788 *
3789 * We take the session mutex and parse and process the reply immediately.
3790 * This preserves the logical ordering of replies, capabilities, etc., sent
3791 * by the MDS as they are applied to our local cache.
3792 */
3793 static void handle_reply(struct ceph_mds_session *session, struct ceph_msg *msg)
3794 {
3795 struct ceph_mds_client *mdsc = session->s_mdsc;
3796 struct ceph_client *cl = mdsc->fsc->client;
3797 struct ceph_mds_request *req;
3798 struct ceph_mds_reply_head *head = msg->front.iov_base;
3799 struct ceph_mds_reply_info_parsed *rinfo; /* parsed reply info */
3800 struct ceph_snap_realm *realm;
3801 u64 tid;
3802 int err, result;
3803 int mds = session->s_mds;
3804 bool close_sessions = false;
3805
3806 if (msg->front.iov_len < sizeof(*head)) {
3807 pr_err_client(cl, "got corrupt (short) reply\n");
3808 ceph_msg_dump(msg);
3809 return;
3810 }
3811
3812 /* get request, session */
3813 tid = le64_to_cpu(msg->hdr.tid);
3814 mutex_lock(&mdsc->mutex);
3815 req = lookup_get_request(mdsc, tid);
3816 if (!req) {
3817 doutc(cl, "on unknown tid %llu\n", tid);
3818 mutex_unlock(&mdsc->mutex);
3819 return;
3820 }
3821 doutc(cl, "handle_reply %p\n", req);
3822
3823 /* correct session? */
3824 if (req->r_session != session) {
3825 pr_err_client(cl, "got %llu on session mds%d not mds%d\n",
3826 tid, session->s_mds,
3827 req->r_session ? req->r_session->s_mds : -1);
3828 mutex_unlock(&mdsc->mutex);
3829 goto out;
3830 }
3831
3832 /* dup? */
3833 if ((test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags) && !head->safe) ||
3834 (test_bit(CEPH_MDS_R_GOT_SAFE, &req->r_req_flags) && head->safe)) {
3835 pr_warn_client(cl, "got a dup %s reply on %llu from mds%d\n",
3836 head->safe ? "safe" : "unsafe", tid, mds);
3837 mutex_unlock(&mdsc->mutex);
3838 goto out;
3839 }
3840 if (test_bit(CEPH_MDS_R_GOT_SAFE, &req->r_req_flags)) {
3841 pr_warn_client(cl, "got unsafe after safe on %llu from mds%d\n",
3842 tid, mds);
3843 mutex_unlock(&mdsc->mutex);
3844 goto out;
3845 }
3846
3847 result = le32_to_cpu(head->result);
3848
3849 if (head->safe) {
3850 set_bit(CEPH_MDS_R_GOT_SAFE, &req->r_req_flags);
3851 __unregister_request(mdsc, req);
3852
3853 /* last request during umount? */
3854 if (mdsc->stopping && !__get_oldest_req(mdsc))
3855 complete_all(&mdsc->safe_umount_waiters);
3856
3857 if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) {
3858 /*
3859 * We already handled the unsafe response, now do the
3860 * cleanup. No need to examine the response; the MDS
3861 * doesn't include any result info in the safe
3862 * response. And even if it did, there is nothing
3863 * useful we could do with a revised return value.
3864 */
3865 doutc(cl, "got safe reply %llu, mds%d\n", tid, mds);
3866
3867 mutex_unlock(&mdsc->mutex);
3868 goto out;
3869 }
3870 } else {
3871 set_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags);
3872 list_add_tail(&req->r_unsafe_item, &req->r_session->s_unsafe);
3873 }
3874
3875 doutc(cl, "tid %lld result %d\n", tid, result);
3876 if (test_bit(CEPHFS_FEATURE_REPLY_ENCODING, &session->s_features))
3877 err = parse_reply_info(session, msg, req, (u64)-1);
3878 else
3879 err = parse_reply_info(session, msg, req,
3880 session->s_con.peer_features);
3881 mutex_unlock(&mdsc->mutex);
3882
3883 /* Must find target inode outside of mutexes to avoid deadlocks */
3884 rinfo = &req->r_reply_info;
3885 if ((err >= 0) && rinfo->head->is_target) {
3886 struct inode *in = xchg(&req->r_new_inode, NULL);
3887 struct ceph_vino tvino = {
3888 .ino = le64_to_cpu(rinfo->targeti.in->ino),
3889 .snap = le64_to_cpu(rinfo->targeti.in->snapid)
3890 };
3891
3892 /*
3893 * If we ended up opening an existing inode, discard
3894 * r_new_inode
3895 */
3896 if (req->r_op == CEPH_MDS_OP_CREATE &&
3897 !req->r_reply_info.has_create_ino) {
3898 /* This should never happen on an async create */
3899 WARN_ON_ONCE(req->r_deleg_ino);
3900 iput(in);
3901 in = NULL;
3902 }
3903
3904 in = ceph_get_inode(mdsc->fsc->sb, tvino, in);
3905 if (IS_ERR(in)) {
3906 err = PTR_ERR(in);
3907 mutex_lock(&session->s_mutex);
3908 goto out_err;
3909 }
3910 req->r_target_inode = in;
3911 }
3912
3913 mutex_lock(&session->s_mutex);
3914 if (err < 0) {
3915 pr_err_client(cl, "got corrupt reply mds%d(tid:%lld)\n",
3916 mds, tid);
3917 ceph_msg_dump(msg);
3918 goto out_err;
3919 }
3920
3921 /* snap trace */
3922 realm = NULL;
3923 if (rinfo->snapblob_len) {
3924 down_write(&mdsc->snap_rwsem);
3925 err = ceph_update_snap_trace(mdsc, rinfo->snapblob,
3926 rinfo->snapblob + rinfo->snapblob_len,
3927 le32_to_cpu(head->op) == CEPH_MDS_OP_RMSNAP,
3928 &realm);
3929 if (err) {
3930 up_write(&mdsc->snap_rwsem);
3931 close_sessions = true;
3932 if (err == -EIO)
3933 ceph_msg_dump(msg);
3934 goto out_err;
3935 }
3936 downgrade_write(&mdsc->snap_rwsem);
3937 } else {
3938 down_read(&mdsc->snap_rwsem);
3939 }
3940
3941 /* insert trace into our cache */
3942 mutex_lock(&req->r_fill_mutex);
3943 current->journal_info = req;
3944 err = ceph_fill_trace(mdsc->fsc->sb, req);
3945 if (err == 0) {
3946 if (result == 0 && (req->r_op == CEPH_MDS_OP_READDIR ||
3947 req->r_op == CEPH_MDS_OP_LSSNAP))
3948 err = ceph_readdir_prepopulate(req, req->r_session);
3949 }
3950 current->journal_info = NULL;
3951 mutex_unlock(&req->r_fill_mutex);
3952
3953 up_read(&mdsc->snap_rwsem);
3954 if (realm)
3955 ceph_put_snap_realm(mdsc, realm);
3956
3957 if (err == 0) {
3958 if (req->r_target_inode &&
3959 test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) {
3960 struct ceph_inode_info *ci =
3961 ceph_inode(req->r_target_inode);
3962 spin_lock(&ci->i_unsafe_lock);
3963 list_add_tail(&req->r_unsafe_target_item,
3964 &ci->i_unsafe_iops);
3965 spin_unlock(&ci->i_unsafe_lock);
3966 }
3967
3968 ceph_unreserve_caps(mdsc, &req->r_caps_reservation);
3969 }
3970 out_err:
3971 mutex_lock(&mdsc->mutex);
3972 if (!test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags)) {
3973 if (err) {
3974 req->r_err = err;
3975 } else {
3976 req->r_reply = ceph_msg_get(msg);
3977 set_bit(CEPH_MDS_R_GOT_RESULT, &req->r_req_flags);
3978 }
3979 } else {
3980 doutc(cl, "reply arrived after request %lld was aborted\n", tid);
3981 }
3982 mutex_unlock(&mdsc->mutex);
3983
3984 mutex_unlock(&session->s_mutex);
3985
3986 /* kick calling process */
3987 complete_request(mdsc, req);
3988
3989 ceph_update_metadata_metrics(&mdsc->metric, req->r_start_latency,
3990 req->r_end_latency, err);
3991 out:
3992 ceph_mdsc_put_request(req);
3993
3994 /* Defer closing the sessions after s_mutex lock being released */
3995 if (close_sessions)
3996 ceph_mdsc_close_sessions(mdsc);
3997 return;
3998 }
3999
4000
4001
4002 /*
4003 * handle mds notification that our request has been forwarded.
4004 */
4005 static void handle_forward(struct ceph_mds_client *mdsc,
4006 struct ceph_mds_session *session,
4007 struct ceph_msg *msg)
4008 {
4009 struct ceph_client *cl = mdsc->fsc->client;
4010 struct ceph_mds_request *req;
4011 u64 tid = le64_to_cpu(msg->hdr.tid);
4012 u32 next_mds;
4013 u32 fwd_seq;
4014 int err = -EINVAL;
4015 void *p = msg->front.iov_base;
4016 void *end = p + msg->front.iov_len;
4017 bool aborted = false;
4018
4019 ceph_decode_need(&p, end, 2*sizeof(u32), bad);
4020 next_mds = ceph_decode_32(&p);
4021 fwd_seq = ceph_decode_32(&p);
4022
4023 mutex_lock(&mdsc->mutex);
4024 req = lookup_get_request(mdsc, tid);
4025 if (!req) {
4026 mutex_unlock(&mdsc->mutex);
4027 doutc(cl, "forward tid %llu to mds%d - req dne\n", tid, next_mds);
4028 return; /* dup reply? */
4029 }
4030
4031 if (test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags)) {
4032 doutc(cl, "forward tid %llu aborted, unregistering\n", tid);
4033 __unregister_request(mdsc, req);
4034 } else if (fwd_seq <= req->r_num_fwd || (uint32_t)fwd_seq >= U32_MAX) {
4035 /*
4036 * Avoid inifinite retrying after overflow.
4037 *
4038 * The MDS will increase the fwd count and in client side
4039 * if the num_fwd is less than the one saved in request
4040 * that means the MDS is an old version and overflowed of
4041 * 8 bits.
4042 */
4043 mutex_lock(&req->r_fill_mutex);
4044 req->r_err = -EMULTIHOP;
4045 set_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags);
4046 mutex_unlock(&req->r_fill_mutex);
4047 aborted = true;
4048 pr_warn_ratelimited_client(cl, "forward tid %llu seq overflow\n",
4049 tid);
4050 } else {
4051 /* resend. forward race not possible; mds would drop */
4052 doutc(cl, "forward tid %llu to mds%d (we resend)\n", tid, next_mds);
4053 BUG_ON(req->r_err);
4054 BUG_ON(test_bit(CEPH_MDS_R_GOT_RESULT, &req->r_req_flags));
4055 req->r_attempts = 0;
4056 req->r_num_fwd = fwd_seq;
4057 req->r_resend_mds = next_mds;
4058 put_request_session(req);
4059 __do_request(mdsc, req);
4060 }
4061 mutex_unlock(&mdsc->mutex);
4062
4063 /* kick calling process */
4064 if (aborted)
4065 complete_request(mdsc, req);
4066 ceph_mdsc_put_request(req);
4067 return;
4068
4069 bad:
4070 pr_err_client(cl, "decode error err=%d\n", err);
4071 ceph_msg_dump(msg);
4072 }
4073
4074 static int __decode_session_metadata(void **p, void *end,
4075 bool *blocklisted)
4076 {
4077 /* map<string,string> */
4078 u32 n;
4079 bool err_str;
4080 ceph_decode_32_safe(p, end, n, bad);
4081 while (n-- > 0) {
4082 u32 len;
4083 ceph_decode_32_safe(p, end, len, bad);
4084 ceph_decode_need(p, end, len, bad);
4085 err_str = !strncmp(*p, "error_string", len);
4086 *p += len;
4087 ceph_decode_32_safe(p, end, len, bad);
4088 ceph_decode_need(p, end, len, bad);
4089 /*
4090 * Match "blocklisted (blacklisted)" from newer MDSes,
4091 * or "blacklisted" from older MDSes.
4092 */
4093 if (err_str && strnstr(*p, "blacklisted", len))
4094 *blocklisted = true;
4095 *p += len;
4096 }
4097 return 0;
4098 bad:
4099 return -1;
4100 }
4101
4102 /*
4103 * handle a mds session control message
4104 */
4105 static void handle_session(struct ceph_mds_session *session,
4106 struct ceph_msg *msg)
4107 {
4108 struct ceph_mds_client *mdsc = session->s_mdsc;
4109 struct ceph_client *cl = mdsc->fsc->client;
4110 int mds = session->s_mds;
4111 int msg_version = le16_to_cpu(msg->hdr.version);
4112 void *p = msg->front.iov_base;
4113 void *end = p + msg->front.iov_len;
4114 struct ceph_mds_session_head *h;
4115 struct ceph_mds_cap_auth *cap_auths = NULL;
4116 u32 op, cap_auths_num = 0;
4117 u64 seq, features = 0;
4118 int wake = 0;
4119 bool blocklisted = false;
4120 u32 i;
4121
4122
4123 /* decode */
4124 ceph_decode_need(&p, end, sizeof(*h), bad);
4125 h = p;
4126 p += sizeof(*h);
4127
4128 op = le32_to_cpu(h->op);
4129 seq = le64_to_cpu(h->seq);
4130
4131 if (msg_version >= 3) {
4132 u32 len;
4133 /* version >= 2 and < 5, decode metadata, skip otherwise
4134 * as it's handled via flags.
4135 */
4136 if (msg_version >= 5)
4137 ceph_decode_skip_map(&p, end, string, string, bad);
4138 else if (__decode_session_metadata(&p, end, &blocklisted) < 0)
4139 goto bad;
4140
4141 /* version >= 3, feature bits */
4142 ceph_decode_32_safe(&p, end, len, bad);
4143 if (len) {
4144 ceph_decode_64_safe(&p, end, features, bad);
4145 p += len - sizeof(features);
4146 }
4147 }
4148
4149 if (msg_version >= 5) {
4150 u32 flags, len;
4151
4152 /* version >= 4 */
4153 ceph_decode_skip_16(&p, end, bad); /* struct_v, struct_cv */
4154 ceph_decode_32_safe(&p, end, len, bad); /* len */
4155 ceph_decode_skip_n(&p, end, len, bad); /* metric_spec */
4156
4157 /* version >= 5, flags */
4158 ceph_decode_32_safe(&p, end, flags, bad);
4159 if (flags & CEPH_SESSION_BLOCKLISTED) {
4160 pr_warn_client(cl, "mds%d session blocklisted\n",
4161 session->s_mds);
4162 blocklisted = true;
4163 }
4164 }
4165
4166 if (msg_version >= 6) {
4167 ceph_decode_32_safe(&p, end, cap_auths_num, bad);
4168 doutc(cl, "cap_auths_num %d\n", cap_auths_num);
4169
4170 if (cap_auths_num && op != CEPH_SESSION_OPEN) {
4171 WARN_ON_ONCE(op != CEPH_SESSION_OPEN);
4172 goto skip_cap_auths;
4173 }
4174
4175 cap_auths = kcalloc(cap_auths_num,
4176 sizeof(struct ceph_mds_cap_auth),
4177 GFP_KERNEL);
4178 if (!cap_auths) {
4179 pr_err_client(cl, "No memory for cap_auths\n");
4180 return;
4181 }
4182
4183 for (i = 0; i < cap_auths_num; i++) {
4184 u32 _len, j;
4185
4186 /* struct_v, struct_compat, and struct_len in MDSCapAuth */
4187 ceph_decode_skip_n(&p, end, 2 + sizeof(u32), bad);
4188
4189 /* struct_v, struct_compat, and struct_len in MDSCapMatch */
4190 ceph_decode_skip_n(&p, end, 2 + sizeof(u32), bad);
4191 ceph_decode_64_safe(&p, end, cap_auths[i].match.uid, bad);
4192 ceph_decode_32_safe(&p, end, _len, bad);
4193 if (_len) {
4194 cap_auths[i].match.gids = kcalloc(_len, sizeof(u32),
4195 GFP_KERNEL);
4196 if (!cap_auths[i].match.gids) {
4197 pr_err_client(cl, "No memory for gids\n");
4198 goto fail;
4199 }
4200
4201 cap_auths[i].match.num_gids = _len;
4202 for (j = 0; j < _len; j++)
4203 ceph_decode_32_safe(&p, end,
4204 cap_auths[i].match.gids[j],
4205 bad);
4206 }
4207
4208 ceph_decode_32_safe(&p, end, _len, bad);
4209 if (_len) {
4210 cap_auths[i].match.path = kcalloc(_len + 1, sizeof(char),
4211 GFP_KERNEL);
4212 if (!cap_auths[i].match.path) {
4213 pr_err_client(cl, "No memory for path\n");
4214 goto fail;
4215 }
4216 ceph_decode_copy(&p, cap_auths[i].match.path, _len);
4217
4218 /* Remove the tailing '/' */
4219 while (_len && cap_auths[i].match.path[_len - 1] == '/') {
4220 cap_auths[i].match.path[_len - 1] = '\0';
4221 _len -= 1;
4222 }
4223 }
4224
4225 ceph_decode_32_safe(&p, end, _len, bad);
4226 if (_len) {
4227 cap_auths[i].match.fs_name = kcalloc(_len + 1, sizeof(char),
4228 GFP_KERNEL);
4229 if (!cap_auths[i].match.fs_name) {
4230 pr_err_client(cl, "No memory for fs_name\n");
4231 goto fail;
4232 }
4233 ceph_decode_copy(&p, cap_auths[i].match.fs_name, _len);
4234 }
4235
4236 ceph_decode_8_safe(&p, end, cap_auths[i].match.root_squash, bad);
4237 ceph_decode_8_safe(&p, end, cap_auths[i].readable, bad);
4238 ceph_decode_8_safe(&p, end, cap_auths[i].writeable, bad);
4239 doutc(cl, "uid %lld, num_gids %u, path %s, fs_name %s, root_squash %d, readable %d, writeable %d\n",
4240 cap_auths[i].match.uid, cap_auths[i].match.num_gids,
4241 cap_auths[i].match.path, cap_auths[i].match.fs_name,
4242 cap_auths[i].match.root_squash,
4243 cap_auths[i].readable, cap_auths[i].writeable);
4244 }
4245 }
4246
4247 skip_cap_auths:
4248 mutex_lock(&mdsc->mutex);
4249 if (op == CEPH_SESSION_OPEN) {
4250 if (mdsc->s_cap_auths) {
4251 for (i = 0; i < mdsc->s_cap_auths_num; i++) {
4252 kfree(mdsc->s_cap_auths[i].match.gids);
4253 kfree(mdsc->s_cap_auths[i].match.path);
4254 kfree(mdsc->s_cap_auths[i].match.fs_name);
4255 }
4256 kfree(mdsc->s_cap_auths);
4257 }
4258 mdsc->s_cap_auths_num = cap_auths_num;
4259 mdsc->s_cap_auths = cap_auths;
4260 }
4261 if (op == CEPH_SESSION_CLOSE) {
4262 ceph_get_mds_session(session);
4263 __unregister_session(mdsc, session);
4264 }
4265 /* FIXME: this ttl calculation is generous */
4266 session->s_ttl = jiffies + HZ*mdsc->mdsmap->m_session_autoclose;
4267 mutex_unlock(&mdsc->mutex);
4268
4269 mutex_lock(&session->s_mutex);
4270
4271 doutc(cl, "mds%d %s %p state %s seq %llu\n", mds,
4272 ceph_session_op_name(op), session,
4273 ceph_session_state_name(session->s_state), seq);
4274
4275 if (session->s_state == CEPH_MDS_SESSION_HUNG) {
4276 session->s_state = CEPH_MDS_SESSION_OPEN;
4277 pr_info_client(cl, "mds%d came back\n", session->s_mds);
4278 }
4279
4280 switch (op) {
4281 case CEPH_SESSION_OPEN:
4282 if (session->s_state == CEPH_MDS_SESSION_RECONNECTING)
4283 pr_info_client(cl, "mds%d reconnect success\n",
4284 session->s_mds);
4285
4286 session->s_features = features;
4287 if (session->s_state == CEPH_MDS_SESSION_OPEN) {
4288 pr_notice_client(cl, "mds%d is already opened\n",
4289 session->s_mds);
4290 } else {
4291 session->s_state = CEPH_MDS_SESSION_OPEN;
4292 renewed_caps(mdsc, session, 0);
4293 if (test_bit(CEPHFS_FEATURE_METRIC_COLLECT,
4294 &session->s_features))
4295 metric_schedule_delayed(&mdsc->metric);
4296 }
4297
4298 /*
4299 * The connection maybe broken and the session in client
4300 * side has been reinitialized, need to update the seq
4301 * anyway.
4302 */
4303 if (!session->s_seq && seq)
4304 session->s_seq = seq;
4305
4306 wake = 1;
4307 if (mdsc->stopping)
4308 __close_session(mdsc, session);
4309 break;
4310
4311 case CEPH_SESSION_RENEWCAPS:
4312 if (session->s_renew_seq == seq)
4313 renewed_caps(mdsc, session, 1);
4314 break;
4315
4316 case CEPH_SESSION_CLOSE:
4317 if (session->s_state == CEPH_MDS_SESSION_RECONNECTING)
4318 pr_info_client(cl, "mds%d reconnect denied\n",
4319 session->s_mds);
4320 session->s_state = CEPH_MDS_SESSION_CLOSED;
4321 cleanup_session_requests(mdsc, session);
4322 remove_session_caps(session);
4323 wake = 2; /* for good measure */
4324 wake_up_all(&mdsc->session_close_wq);
4325 break;
4326
4327 case CEPH_SESSION_STALE:
4328 pr_info_client(cl, "mds%d caps went stale, renewing\n",
4329 session->s_mds);
4330 atomic_inc(&session->s_cap_gen);
4331 session->s_cap_ttl = jiffies - 1;
4332 send_renew_caps(mdsc, session);
4333 break;
4334
4335 case CEPH_SESSION_RECALL_STATE:
4336 ceph_trim_caps(mdsc, session, le32_to_cpu(h->max_caps));
4337 break;
4338
4339 case CEPH_SESSION_FLUSHMSG:
4340 /* flush cap releases */
4341 spin_lock(&session->s_cap_lock);
4342 if (session->s_num_cap_releases)
4343 ceph_flush_cap_releases(mdsc, session);
4344 spin_unlock(&session->s_cap_lock);
4345
4346 send_flushmsg_ack(mdsc, session, seq);
4347 break;
4348
4349 case CEPH_SESSION_FORCE_RO:
4350 doutc(cl, "force_session_readonly %p\n", session);
4351 spin_lock(&session->s_cap_lock);
4352 session->s_readonly = true;
4353 spin_unlock(&session->s_cap_lock);
4354 wake_up_session_caps(session, FORCE_RO);
4355 break;
4356
4357 case CEPH_SESSION_REJECT:
4358 WARN_ON(session->s_state != CEPH_MDS_SESSION_OPENING);
4359 pr_info_client(cl, "mds%d rejected session\n",
4360 session->s_mds);
4361 session->s_state = CEPH_MDS_SESSION_REJECTED;
4362 cleanup_session_requests(mdsc, session);
4363 remove_session_caps(session);
4364 if (blocklisted)
4365 mdsc->fsc->blocklisted = true;
4366 wake = 2; /* for good measure */
4367 break;
4368
4369 default:
4370 pr_err_client(cl, "bad op %d mds%d\n", op, mds);
4371 WARN_ON(1);
4372 }
4373
4374 mutex_unlock(&session->s_mutex);
4375 if (wake) {
4376 mutex_lock(&mdsc->mutex);
4377 __wake_requests(mdsc, &session->s_waiting);
4378 if (wake == 2)
4379 kick_requests(mdsc, mds);
4380 mutex_unlock(&mdsc->mutex);
4381 }
4382 if (op == CEPH_SESSION_CLOSE)
4383 ceph_put_mds_session(session);
4384 return;
4385
4386 bad:
4387 pr_err_client(cl, "corrupt message mds%d len %d\n", mds,
4388 (int)msg->front.iov_len);
4389 ceph_msg_dump(msg);
4390 fail:
4391 for (i = 0; i < cap_auths_num; i++) {
4392 kfree(cap_auths[i].match.gids);
4393 kfree(cap_auths[i].match.path);
4394 kfree(cap_auths[i].match.fs_name);
4395 }
4396 kfree(cap_auths);
4397 return;
4398 }
4399
4400 void ceph_mdsc_release_dir_caps(struct ceph_mds_request *req)
4401 {
4402 struct ceph_client *cl = req->r_mdsc->fsc->client;
4403 int dcaps;
4404
4405 dcaps = xchg(&req->r_dir_caps, 0);
4406 if (dcaps) {
4407 doutc(cl, "releasing r_dir_caps=%s\n", ceph_cap_string(dcaps));
4408 ceph_put_cap_refs(ceph_inode(req->r_parent), dcaps);
4409 }
4410 }
4411
4412 void ceph_mdsc_release_dir_caps_async(struct ceph_mds_request *req)
4413 {
4414 struct ceph_client *cl = req->r_mdsc->fsc->client;
4415 int dcaps;
4416
4417 dcaps = xchg(&req->r_dir_caps, 0);
4418 if (dcaps) {
4419 doutc(cl, "releasing r_dir_caps=%s\n", ceph_cap_string(dcaps));
4420 ceph_put_cap_refs_async(ceph_inode(req->r_parent), dcaps);
4421 }
4422 }
4423
4424 /*
4425 * called under session->mutex.
4426 */
4427 static void replay_unsafe_requests(struct ceph_mds_client *mdsc,
4428 struct ceph_mds_session *session)
4429 {
4430 struct ceph_mds_request *req, *nreq;
4431 struct rb_node *p;
4432
4433 doutc(mdsc->fsc->client, "mds%d\n", session->s_mds);
4434
4435 mutex_lock(&mdsc->mutex);
4436 list_for_each_entry_safe(req, nreq, &session->s_unsafe, r_unsafe_item)
4437 __send_request(session, req, true);
4438
4439 /*
4440 * also re-send old requests when MDS enters reconnect stage. So that MDS
4441 * can process completed request in clientreplay stage.
4442 */
4443 p = rb_first(&mdsc->request_tree);
4444 while (p) {
4445 req = rb_entry(p, struct ceph_mds_request, r_node);
4446 p = rb_next(p);
4447 if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags))
4448 continue;
4449 if (req->r_attempts == 0)
4450 continue; /* only old requests */
4451 if (!req->r_session)
4452 continue;
4453 if (req->r_session->s_mds != session->s_mds)
4454 continue;
4455
4456 ceph_mdsc_release_dir_caps_async(req);
4457
4458 __send_request(session, req, true);
4459 }
4460 mutex_unlock(&mdsc->mutex);
4461 }
4462
4463 static int send_reconnect_partial(struct ceph_reconnect_state *recon_state)
4464 {
4465 struct ceph_msg *reply;
4466 struct ceph_pagelist *_pagelist;
4467 struct page *page;
4468 __le32 *addr;
4469 int err = -ENOMEM;
4470
4471 if (!recon_state->allow_multi)
4472 return -ENOSPC;
4473
4474 /* can't handle message that contains both caps and realm */
4475 BUG_ON(!recon_state->nr_caps == !recon_state->nr_realms);
4476
4477 /* pre-allocate new pagelist */
4478 _pagelist = ceph_pagelist_alloc(GFP_NOFS);
4479 if (!_pagelist)
4480 return -ENOMEM;
4481
4482 reply = ceph_msg_new2(CEPH_MSG_CLIENT_RECONNECT, 0, 1, GFP_NOFS, false);
4483 if (!reply)
4484 goto fail_msg;
4485
4486 /* placeholder for nr_caps */
4487 err = ceph_pagelist_encode_32(_pagelist, 0);
4488 if (err < 0)
4489 goto fail;
4490
4491 if (recon_state->nr_caps) {
4492 /* currently encoding caps */
4493 err = ceph_pagelist_encode_32(recon_state->pagelist, 0);
4494 if (err)
4495 goto fail;
4496 } else {
4497 /* placeholder for nr_realms (currently encoding relams) */
4498 err = ceph_pagelist_encode_32(_pagelist, 0);
4499 if (err < 0)
4500 goto fail;
4501 }
4502
4503 err = ceph_pagelist_encode_8(recon_state->pagelist, 1);
4504 if (err)
4505 goto fail;
4506
4507 page = list_first_entry(&recon_state->pagelist->head, struct page, lru);
4508 addr = kmap_atomic(page);
4509 if (recon_state->nr_caps) {
4510 /* currently encoding caps */
4511 *addr = cpu_to_le32(recon_state->nr_caps);
4512 } else {
4513 /* currently encoding relams */
4514 *(addr + 1) = cpu_to_le32(recon_state->nr_realms);
4515 }
4516 kunmap_atomic(addr);
4517
4518 reply->hdr.version = cpu_to_le16(5);
4519 reply->hdr.compat_version = cpu_to_le16(4);
4520
4521 reply->hdr.data_len = cpu_to_le32(recon_state->pagelist->length);
4522 ceph_msg_data_add_pagelist(reply, recon_state->pagelist);
4523
4524 ceph_con_send(&recon_state->session->s_con, reply);
4525 ceph_pagelist_release(recon_state->pagelist);
4526
4527 recon_state->pagelist = _pagelist;
4528 recon_state->nr_caps = 0;
4529 recon_state->nr_realms = 0;
4530 recon_state->msg_version = 5;
4531 return 0;
4532 fail:
4533 ceph_msg_put(reply);
4534 fail_msg:
4535 ceph_pagelist_release(_pagelist);
4536 return err;
4537 }
4538
4539 static struct dentry* d_find_primary(struct inode *inode)
4540 {
4541 struct dentry *alias, *dn = NULL;
4542
4543 if (hlist_empty(&inode->i_dentry))
4544 return NULL;
4545
4546 spin_lock(&inode->i_lock);
4547 if (hlist_empty(&inode->i_dentry))
4548 goto out_unlock;
4549
4550 if (S_ISDIR(inode->i_mode)) {
4551 alias = hlist_entry(inode->i_dentry.first, struct dentry, d_u.d_alias);
4552 if (!IS_ROOT(alias))
4553 dn = dget(alias);
4554 goto out_unlock;
4555 }
4556
4557 hlist_for_each_entry(alias, &inode->i_dentry, d_u.d_alias) {
4558 spin_lock(&alias->d_lock);
4559 if (!d_unhashed(alias) &&
4560 (ceph_dentry(alias)->flags & CEPH_DENTRY_PRIMARY_LINK)) {
4561 dn = dget_dlock(alias);
4562 }
4563 spin_unlock(&alias->d_lock);
4564 if (dn)
4565 break;
4566 }
4567 out_unlock:
4568 spin_unlock(&inode->i_lock);
4569 return dn;
4570 }
4571
4572 /*
4573 * Encode information about a cap for a reconnect with the MDS.
4574 */
4575 static int reconnect_caps_cb(struct inode *inode, int mds, void *arg)
4576 {
4577 struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(inode->i_sb);
4578 struct ceph_client *cl = ceph_inode_to_client(inode);
4579 union {
4580 struct ceph_mds_cap_reconnect v2;
4581 struct ceph_mds_cap_reconnect_v1 v1;
4582 } rec;
4583 struct ceph_inode_info *ci = ceph_inode(inode);
4584 struct ceph_reconnect_state *recon_state = arg;
4585 struct ceph_pagelist *pagelist = recon_state->pagelist;
4586 struct dentry *dentry;
4587 struct ceph_cap *cap;
4588 char *path;
4589 int pathlen = 0, err;
4590 u64 pathbase;
4591 u64 snap_follows;
4592
4593 dentry = d_find_primary(inode);
4594 if (dentry) {
4595 /* set pathbase to parent dir when msg_version >= 2 */
4596 path = ceph_mdsc_build_path(mdsc, dentry, &pathlen, &pathbase,
4597 recon_state->msg_version >= 2);
4598 dput(dentry);
4599 if (IS_ERR(path)) {
4600 err = PTR_ERR(path);
4601 goto out_err;
4602 }
4603 } else {
4604 path = NULL;
4605 pathbase = 0;
4606 }
4607
4608 spin_lock(&ci->i_ceph_lock);
4609 cap = __get_cap_for_mds(ci, mds);
4610 if (!cap) {
4611 spin_unlock(&ci->i_ceph_lock);
4612 err = 0;
4613 goto out_err;
4614 }
4615 doutc(cl, " adding %p ino %llx.%llx cap %p %lld %s\n", inode,
4616 ceph_vinop(inode), cap, cap->cap_id,
4617 ceph_cap_string(cap->issued));
4618
4619 cap->seq = 0; /* reset cap seq */
4620 cap->issue_seq = 0; /* and issue_seq */
4621 cap->mseq = 0; /* and migrate_seq */
4622 cap->cap_gen = atomic_read(&cap->session->s_cap_gen);
4623
4624 /* These are lost when the session goes away */
4625 if (S_ISDIR(inode->i_mode)) {
4626 if (cap->issued & CEPH_CAP_DIR_CREATE) {
4627 ceph_put_string(rcu_dereference_raw(ci->i_cached_layout.pool_ns));
4628 memset(&ci->i_cached_layout, 0, sizeof(ci->i_cached_layout));
4629 }
4630 cap->issued &= ~CEPH_CAP_ANY_DIR_OPS;
4631 }
4632
4633 if (recon_state->msg_version >= 2) {
4634 rec.v2.cap_id = cpu_to_le64(cap->cap_id);
4635 rec.v2.wanted = cpu_to_le32(__ceph_caps_wanted(ci));
4636 rec.v2.issued = cpu_to_le32(cap->issued);
4637 rec.v2.snaprealm = cpu_to_le64(ci->i_snap_realm->ino);
4638 rec.v2.pathbase = cpu_to_le64(pathbase);
4639 rec.v2.flock_len = (__force __le32)
4640 ((ci->i_ceph_flags & CEPH_I_ERROR_FILELOCK) ? 0 : 1);
4641 } else {
4642 struct timespec64 ts;
4643
4644 rec.v1.cap_id = cpu_to_le64(cap->cap_id);
4645 rec.v1.wanted = cpu_to_le32(__ceph_caps_wanted(ci));
4646 rec.v1.issued = cpu_to_le32(cap->issued);
4647 rec.v1.size = cpu_to_le64(i_size_read(inode));
4648 ts = inode_get_mtime(inode);
4649 ceph_encode_timespec64(&rec.v1.mtime, &ts);
4650 ts = inode_get_atime(inode);
4651 ceph_encode_timespec64(&rec.v1.atime, &ts);
4652 rec.v1.snaprealm = cpu_to_le64(ci->i_snap_realm->ino);
4653 rec.v1.pathbase = cpu_to_le64(pathbase);
4654 }
4655
4656 if (list_empty(&ci->i_cap_snaps)) {
4657 snap_follows = ci->i_head_snapc ? ci->i_head_snapc->seq : 0;
4658 } else {
4659 struct ceph_cap_snap *capsnap =
4660 list_first_entry(&ci->i_cap_snaps,
4661 struct ceph_cap_snap, ci_item);
4662 snap_follows = capsnap->follows;
4663 }
4664 spin_unlock(&ci->i_ceph_lock);
4665
4666 if (recon_state->msg_version >= 2) {
4667 int num_fcntl_locks, num_flock_locks;
4668 struct ceph_filelock *flocks = NULL;
4669 size_t struct_len, total_len = sizeof(u64);
4670 u8 struct_v = 0;
4671
4672 encode_again:
4673 if (rec.v2.flock_len) {
4674 ceph_count_locks(inode, &num_fcntl_locks, &num_flock_locks);
4675 } else {
4676 num_fcntl_locks = 0;
4677 num_flock_locks = 0;
4678 }
4679 if (num_fcntl_locks + num_flock_locks > 0) {
4680 flocks = kmalloc_array(num_fcntl_locks + num_flock_locks,
4681 sizeof(struct ceph_filelock),
4682 GFP_NOFS);
4683 if (!flocks) {
4684 err = -ENOMEM;
4685 goto out_err;
4686 }
4687 err = ceph_encode_locks_to_buffer(inode, flocks,
4688 num_fcntl_locks,
4689 num_flock_locks);
4690 if (err) {
4691 kfree(flocks);
4692 flocks = NULL;
4693 if (err == -ENOSPC)
4694 goto encode_again;
4695 goto out_err;
4696 }
4697 } else {
4698 kfree(flocks);
4699 flocks = NULL;
4700 }
4701
4702 if (recon_state->msg_version >= 3) {
4703 /* version, compat_version and struct_len */
4704 total_len += 2 * sizeof(u8) + sizeof(u32);
4705 struct_v = 2;
4706 }
4707 /*
4708 * number of encoded locks is stable, so copy to pagelist
4709 */
4710 struct_len = 2 * sizeof(u32) +
4711 (num_fcntl_locks + num_flock_locks) *
4712 sizeof(struct ceph_filelock);
4713 rec.v2.flock_len = cpu_to_le32(struct_len);
4714
4715 struct_len += sizeof(u32) + pathlen + sizeof(rec.v2);
4716
4717 if (struct_v >= 2)
4718 struct_len += sizeof(u64); /* snap_follows */
4719
4720 total_len += struct_len;
4721
4722 if (pagelist->length + total_len > RECONNECT_MAX_SIZE) {
4723 err = send_reconnect_partial(recon_state);
4724 if (err)
4725 goto out_freeflocks;
4726 pagelist = recon_state->pagelist;
4727 }
4728
4729 err = ceph_pagelist_reserve(pagelist, total_len);
4730 if (err)
4731 goto out_freeflocks;
4732
4733 ceph_pagelist_encode_64(pagelist, ceph_ino(inode));
4734 if (recon_state->msg_version >= 3) {
4735 ceph_pagelist_encode_8(pagelist, struct_v);
4736 ceph_pagelist_encode_8(pagelist, 1);
4737 ceph_pagelist_encode_32(pagelist, struct_len);
4738 }
4739 ceph_pagelist_encode_string(pagelist, path, pathlen);
4740 ceph_pagelist_append(pagelist, &rec, sizeof(rec.v2));
4741 ceph_locks_to_pagelist(flocks, pagelist,
4742 num_fcntl_locks, num_flock_locks);
4743 if (struct_v >= 2)
4744 ceph_pagelist_encode_64(pagelist, snap_follows);
4745 out_freeflocks:
4746 kfree(flocks);
4747 } else {
4748 err = ceph_pagelist_reserve(pagelist,
4749 sizeof(u64) + sizeof(u32) +
4750 pathlen + sizeof(rec.v1));
4751 if (err)
4752 goto out_err;
4753
4754 ceph_pagelist_encode_64(pagelist, ceph_ino(inode));
4755 ceph_pagelist_encode_string(pagelist, path, pathlen);
4756 ceph_pagelist_append(pagelist, &rec, sizeof(rec.v1));
4757 }
4758
4759 out_err:
4760 ceph_mdsc_free_path(path, pathlen);
4761 if (!err)
4762 recon_state->nr_caps++;
4763 return err;
4764 }
4765
4766 static int encode_snap_realms(struct ceph_mds_client *mdsc,
4767 struct ceph_reconnect_state *recon_state)
4768 {
4769 struct rb_node *p;
4770 struct ceph_pagelist *pagelist = recon_state->pagelist;
4771 struct ceph_client *cl = mdsc->fsc->client;
4772 int err = 0;
4773
4774 if (recon_state->msg_version >= 4) {
4775 err = ceph_pagelist_encode_32(pagelist, mdsc->num_snap_realms);
4776 if (err < 0)
4777 goto fail;
4778 }
4779
4780 /*
4781 * snaprealms. we provide mds with the ino, seq (version), and
4782 * parent for all of our realms. If the mds has any newer info,
4783 * it will tell us.
4784 */
4785 for (p = rb_first(&mdsc->snap_realms); p; p = rb_next(p)) {
4786 struct ceph_snap_realm *realm =
4787 rb_entry(p, struct ceph_snap_realm, node);
4788 struct ceph_mds_snaprealm_reconnect sr_rec;
4789
4790 if (recon_state->msg_version >= 4) {
4791 size_t need = sizeof(u8) * 2 + sizeof(u32) +
4792 sizeof(sr_rec);
4793
4794 if (pagelist->length + need > RECONNECT_MAX_SIZE) {
4795 err = send_reconnect_partial(recon_state);
4796 if (err)
4797 goto fail;
4798 pagelist = recon_state->pagelist;
4799 }
4800
4801 err = ceph_pagelist_reserve(pagelist, need);
4802 if (err)
4803 goto fail;
4804
4805 ceph_pagelist_encode_8(pagelist, 1);
4806 ceph_pagelist_encode_8(pagelist, 1);
4807 ceph_pagelist_encode_32(pagelist, sizeof(sr_rec));
4808 }
4809
4810 doutc(cl, " adding snap realm %llx seq %lld parent %llx\n",
4811 realm->ino, realm->seq, realm->parent_ino);
4812 sr_rec.ino = cpu_to_le64(realm->ino);
4813 sr_rec.seq = cpu_to_le64(realm->seq);
4814 sr_rec.parent = cpu_to_le64(realm->parent_ino);
4815
4816 err = ceph_pagelist_append(pagelist, &sr_rec, sizeof(sr_rec));
4817 if (err)
4818 goto fail;
4819
4820 recon_state->nr_realms++;
4821 }
4822 fail:
4823 return err;
4824 }
4825
4826
4827 /*
4828 * If an MDS fails and recovers, clients need to reconnect in order to
4829 * reestablish shared state. This includes all caps issued through
4830 * this session _and_ the snap_realm hierarchy. Because it's not
4831 * clear which snap realms the mds cares about, we send everything we
4832 * know about.. that ensures we'll then get any new info the
4833 * recovering MDS might have.
4834 *
4835 * This is a relatively heavyweight operation, but it's rare.
4836 */
4837 static void send_mds_reconnect(struct ceph_mds_client *mdsc,
4838 struct ceph_mds_session *session)
4839 {
4840 struct ceph_client *cl = mdsc->fsc->client;
4841 struct ceph_msg *reply;
4842 int mds = session->s_mds;
4843 int err = -ENOMEM;
4844 struct ceph_reconnect_state recon_state = {
4845 .session = session,
4846 };
4847 LIST_HEAD(dispose);
4848
4849 pr_info_client(cl, "mds%d reconnect start\n", mds);
4850
4851 recon_state.pagelist = ceph_pagelist_alloc(GFP_NOFS);
4852 if (!recon_state.pagelist)
4853 goto fail_nopagelist;
4854
4855 reply = ceph_msg_new2(CEPH_MSG_CLIENT_RECONNECT, 0, 1, GFP_NOFS, false);
4856 if (!reply)
4857 goto fail_nomsg;
4858
4859 xa_destroy(&session->s_delegated_inos);
4860
4861 mutex_lock(&session->s_mutex);
4862 session->s_state = CEPH_MDS_SESSION_RECONNECTING;
4863 session->s_seq = 0;
4864
4865 doutc(cl, "session %p state %s\n", session,
4866 ceph_session_state_name(session->s_state));
4867
4868 atomic_inc(&session->s_cap_gen);
4869
4870 spin_lock(&session->s_cap_lock);
4871 /* don't know if session is readonly */
4872 session->s_readonly = 0;
4873 /*
4874 * notify __ceph_remove_cap() that we are composing cap reconnect.
4875 * If a cap get released before being added to the cap reconnect,
4876 * __ceph_remove_cap() should skip queuing cap release.
4877 */
4878 session->s_cap_reconnect = 1;
4879 /* drop old cap expires; we're about to reestablish that state */
4880 detach_cap_releases(session, &dispose);
4881 spin_unlock(&session->s_cap_lock);
4882 dispose_cap_releases(mdsc, &dispose);
4883
4884 /* trim unused caps to reduce MDS's cache rejoin time */
4885 if (mdsc->fsc->sb->s_root)
4886 shrink_dcache_parent(mdsc->fsc->sb->s_root);
4887
4888 ceph_con_close(&session->s_con);
4889 ceph_con_open(&session->s_con,
4890 CEPH_ENTITY_TYPE_MDS, mds,
4891 ceph_mdsmap_get_addr(mdsc->mdsmap, mds));
4892
4893 /* replay unsafe requests */
4894 replay_unsafe_requests(mdsc, session);
4895
4896 ceph_early_kick_flushing_caps(mdsc, session);
4897
4898 down_read(&mdsc->snap_rwsem);
4899
4900 /* placeholder for nr_caps */
4901 err = ceph_pagelist_encode_32(recon_state.pagelist, 0);
4902 if (err)
4903 goto fail;
4904
4905 if (test_bit(CEPHFS_FEATURE_MULTI_RECONNECT, &session->s_features)) {
4906 recon_state.msg_version = 3;
4907 recon_state.allow_multi = true;
4908 } else if (session->s_con.peer_features & CEPH_FEATURE_MDSENC) {
4909 recon_state.msg_version = 3;
4910 } else {
4911 recon_state.msg_version = 2;
4912 }
4913 /* trsaverse this session's caps */
4914 err = ceph_iterate_session_caps(session, reconnect_caps_cb, &recon_state);
4915
4916 spin_lock(&session->s_cap_lock);
4917 session->s_cap_reconnect = 0;
4918 spin_unlock(&session->s_cap_lock);
4919
4920 if (err < 0)
4921 goto fail;
4922
4923 /* check if all realms can be encoded into current message */
4924 if (mdsc->num_snap_realms) {
4925 size_t total_len =
4926 recon_state.pagelist->length +
4927 mdsc->num_snap_realms *
4928 sizeof(struct ceph_mds_snaprealm_reconnect);
4929 if (recon_state.msg_version >= 4) {
4930 /* number of realms */
4931 total_len += sizeof(u32);
4932 /* version, compat_version and struct_len */
4933 total_len += mdsc->num_snap_realms *
4934 (2 * sizeof(u8) + sizeof(u32));
4935 }
4936 if (total_len > RECONNECT_MAX_SIZE) {
4937 if (!recon_state.allow_multi) {
4938 err = -ENOSPC;
4939 goto fail;
4940 }
4941 if (recon_state.nr_caps) {
4942 err = send_reconnect_partial(&recon_state);
4943 if (err)
4944 goto fail;
4945 }
4946 recon_state.msg_version = 5;
4947 }
4948 }
4949
4950 err = encode_snap_realms(mdsc, &recon_state);
4951 if (err < 0)
4952 goto fail;
4953
4954 if (recon_state.msg_version >= 5) {
4955 err = ceph_pagelist_encode_8(recon_state.pagelist, 0);
4956 if (err < 0)
4957 goto fail;
4958 }
4959
4960 if (recon_state.nr_caps || recon_state.nr_realms) {
4961 struct page *page =
4962 list_first_entry(&recon_state.pagelist->head,
4963 struct page, lru);
4964 __le32 *addr = kmap_atomic(page);
4965 if (recon_state.nr_caps) {
4966 WARN_ON(recon_state.nr_realms != mdsc->num_snap_realms);
4967 *addr = cpu_to_le32(recon_state.nr_caps);
4968 } else if (recon_state.msg_version >= 4) {
4969 *(addr + 1) = cpu_to_le32(recon_state.nr_realms);
4970 }
4971 kunmap_atomic(addr);
4972 }
4973
4974 reply->hdr.version = cpu_to_le16(recon_state.msg_version);
4975 if (recon_state.msg_version >= 4)
4976 reply->hdr.compat_version = cpu_to_le16(4);
4977
4978 reply->hdr.data_len = cpu_to_le32(recon_state.pagelist->length);
4979 ceph_msg_data_add_pagelist(reply, recon_state.pagelist);
4980
4981 ceph_con_send(&session->s_con, reply);
4982
4983 mutex_unlock(&session->s_mutex);
4984
4985 mutex_lock(&mdsc->mutex);
4986 __wake_requests(mdsc, &session->s_waiting);
4987 mutex_unlock(&mdsc->mutex);
4988
4989 up_read(&mdsc->snap_rwsem);
4990 ceph_pagelist_release(recon_state.pagelist);
4991 return;
4992
4993 fail:
4994 ceph_msg_put(reply);
4995 up_read(&mdsc->snap_rwsem);
4996 mutex_unlock(&session->s_mutex);
4997 fail_nomsg:
4998 ceph_pagelist_release(recon_state.pagelist);
4999 fail_nopagelist:
5000 pr_err_client(cl, "error %d preparing reconnect for mds%d\n",
5001 err, mds);
5002 return;
5003 }
5004
5005
5006 /*
5007 * compare old and new mdsmaps, kicking requests
5008 * and closing out old connections as necessary
5009 *
5010 * called under mdsc->mutex.
5011 */
5012 static void check_new_map(struct ceph_mds_client *mdsc,
5013 struct ceph_mdsmap *newmap,
5014 struct ceph_mdsmap *oldmap)
5015 {
5016 int i, j, err;
5017 int oldstate, newstate;
5018 struct ceph_mds_session *s;
5019 unsigned long targets[DIV_ROUND_UP(CEPH_MAX_MDS, sizeof(unsigned long))] = {0};
5020 struct ceph_client *cl = mdsc->fsc->client;
5021
5022 doutc(cl, "new %u old %u\n", newmap->m_epoch, oldmap->m_epoch);
5023
5024 if (newmap->m_info) {
5025 for (i = 0; i < newmap->possible_max_rank; i++) {
5026 for (j = 0; j < newmap->m_info[i].num_export_targets; j++)
5027 set_bit(newmap->m_info[i].export_targets[j], targets);
5028 }
5029 }
5030
5031 for (i = 0; i < oldmap->possible_max_rank && i < mdsc->max_sessions; i++) {
5032 if (!mdsc->sessions[i])
5033 continue;
5034 s = mdsc->sessions[i];
5035 oldstate = ceph_mdsmap_get_state(oldmap, i);
5036 newstate = ceph_mdsmap_get_state(newmap, i);
5037
5038 doutc(cl, "mds%d state %s%s -> %s%s (session %s)\n",
5039 i, ceph_mds_state_name(oldstate),
5040 ceph_mdsmap_is_laggy(oldmap, i) ? " (laggy)" : "",
5041 ceph_mds_state_name(newstate),
5042 ceph_mdsmap_is_laggy(newmap, i) ? " (laggy)" : "",
5043 ceph_session_state_name(s->s_state));
5044
5045 if (i >= newmap->possible_max_rank) {
5046 /* force close session for stopped mds */
5047 ceph_get_mds_session(s);
5048 __unregister_session(mdsc, s);
5049 __wake_requests(mdsc, &s->s_waiting);
5050 mutex_unlock(&mdsc->mutex);
5051
5052 mutex_lock(&s->s_mutex);
5053 cleanup_session_requests(mdsc, s);
5054 remove_session_caps(s);
5055 mutex_unlock(&s->s_mutex);
5056
5057 ceph_put_mds_session(s);
5058
5059 mutex_lock(&mdsc->mutex);
5060 kick_requests(mdsc, i);
5061 continue;
5062 }
5063
5064 if (memcmp(ceph_mdsmap_get_addr(oldmap, i),
5065 ceph_mdsmap_get_addr(newmap, i),
5066 sizeof(struct ceph_entity_addr))) {
5067 /* just close it */
5068 mutex_unlock(&mdsc->mutex);
5069 mutex_lock(&s->s_mutex);
5070 mutex_lock(&mdsc->mutex);
5071 ceph_con_close(&s->s_con);
5072 mutex_unlock(&s->s_mutex);
5073 s->s_state = CEPH_MDS_SESSION_RESTARTING;
5074 } else if (oldstate == newstate) {
5075 continue; /* nothing new with this mds */
5076 }
5077
5078 /*
5079 * send reconnect?
5080 */
5081 if (s->s_state == CEPH_MDS_SESSION_RESTARTING &&
5082 newstate >= CEPH_MDS_STATE_RECONNECT) {
5083 mutex_unlock(&mdsc->mutex);
5084 clear_bit(i, targets);
5085 send_mds_reconnect(mdsc, s);
5086 mutex_lock(&mdsc->mutex);
5087 }
5088
5089 /*
5090 * kick request on any mds that has gone active.
5091 */
5092 if (oldstate < CEPH_MDS_STATE_ACTIVE &&
5093 newstate >= CEPH_MDS_STATE_ACTIVE) {
5094 if (oldstate != CEPH_MDS_STATE_CREATING &&
5095 oldstate != CEPH_MDS_STATE_STARTING)
5096 pr_info_client(cl, "mds%d recovery completed\n",
5097 s->s_mds);
5098 kick_requests(mdsc, i);
5099 mutex_unlock(&mdsc->mutex);
5100 mutex_lock(&s->s_mutex);
5101 mutex_lock(&mdsc->mutex);
5102 ceph_kick_flushing_caps(mdsc, s);
5103 mutex_unlock(&s->s_mutex);
5104 wake_up_session_caps(s, RECONNECT);
5105 }
5106 }
5107
5108 /*
5109 * Only open and reconnect sessions that don't exist yet.
5110 */
5111 for (i = 0; i < newmap->possible_max_rank; i++) {
5112 /*
5113 * In case the import MDS is crashed just after
5114 * the EImportStart journal is flushed, so when
5115 * a standby MDS takes over it and is replaying
5116 * the EImportStart journal the new MDS daemon
5117 * will wait the client to reconnect it, but the
5118 * client may never register/open the session yet.
5119 *
5120 * Will try to reconnect that MDS daemon if the
5121 * rank number is in the export targets array and
5122 * is the up:reconnect state.
5123 */
5124 newstate = ceph_mdsmap_get_state(newmap, i);
5125 if (!test_bit(i, targets) || newstate != CEPH_MDS_STATE_RECONNECT)
5126 continue;
5127
5128 /*
5129 * The session maybe registered and opened by some
5130 * requests which were choosing random MDSes during
5131 * the mdsc->mutex's unlock/lock gap below in rare
5132 * case. But the related MDS daemon will just queue
5133 * that requests and be still waiting for the client's
5134 * reconnection request in up:reconnect state.
5135 */
5136 s = __ceph_lookup_mds_session(mdsc, i);
5137 if (likely(!s)) {
5138 s = __open_export_target_session(mdsc, i);
5139 if (IS_ERR(s)) {
5140 err = PTR_ERR(s);
5141 pr_err_client(cl,
5142 "failed to open export target session, err %d\n",
5143 err);
5144 continue;
5145 }
5146 }
5147 doutc(cl, "send reconnect to export target mds.%d\n", i);
5148 mutex_unlock(&mdsc->mutex);
5149 send_mds_reconnect(mdsc, s);
5150 ceph_put_mds_session(s);
5151 mutex_lock(&mdsc->mutex);
5152 }
5153
5154 for (i = 0; i < newmap->possible_max_rank && i < mdsc->max_sessions; i++) {
5155 s = mdsc->sessions[i];
5156 if (!s)
5157 continue;
5158 if (!ceph_mdsmap_is_laggy(newmap, i))
5159 continue;
5160 if (s->s_state == CEPH_MDS_SESSION_OPEN ||
5161 s->s_state == CEPH_MDS_SESSION_HUNG ||
5162 s->s_state == CEPH_MDS_SESSION_CLOSING) {
5163 doutc(cl, " connecting to export targets of laggy mds%d\n", i);
5164 __open_export_target_sessions(mdsc, s);
5165 }
5166 }
5167 }
5168
5169
5170
5171 /*
5172 * leases
5173 */
5174
5175 /*
5176 * caller must hold session s_mutex, dentry->d_lock
5177 */
5178 void __ceph_mdsc_drop_dentry_lease(struct dentry *dentry)
5179 {
5180 struct ceph_dentry_info *di = ceph_dentry(dentry);
5181
5182 ceph_put_mds_session(di->lease_session);
5183 di->lease_session = NULL;
5184 }
5185
5186 static void handle_lease(struct ceph_mds_client *mdsc,
5187 struct ceph_mds_session *session,
5188 struct ceph_msg *msg)
5189 {
5190 struct ceph_client *cl = mdsc->fsc->client;
5191 struct super_block *sb = mdsc->fsc->sb;
5192 struct inode *inode;
5193 struct dentry *parent, *dentry;
5194 struct ceph_dentry_info *di;
5195 int mds = session->s_mds;
5196 struct ceph_mds_lease *h = msg->front.iov_base;
5197 u32 seq;
5198 struct ceph_vino vino;
5199 struct qstr dname;
5200 int release = 0;
5201
5202 doutc(cl, "from mds%d\n", mds);
5203
5204 if (!ceph_inc_mds_stopping_blocker(mdsc, session))
5205 return;
5206
5207 /* decode */
5208 if (msg->front.iov_len < sizeof(*h) + sizeof(u32))
5209 goto bad;
5210 vino.ino = le64_to_cpu(h->ino);
5211 vino.snap = CEPH_NOSNAP;
5212 seq = le32_to_cpu(h->seq);
5213 dname.len = get_unaligned_le32(h + 1);
5214 if (msg->front.iov_len < sizeof(*h) + sizeof(u32) + dname.len)
5215 goto bad;
5216 dname.name = (void *)(h + 1) + sizeof(u32);
5217
5218 /* lookup inode */
5219 inode = ceph_find_inode(sb, vino);
5220 doutc(cl, "%s, ino %llx %p %.*s\n", ceph_lease_op_name(h->action),
5221 vino.ino, inode, dname.len, dname.name);
5222
5223 mutex_lock(&session->s_mutex);
5224 if (!inode) {
5225 doutc(cl, "no inode %llx\n", vino.ino);
5226 goto release;
5227 }
5228
5229 /* dentry */
5230 parent = d_find_alias(inode);
5231 if (!parent) {
5232 doutc(cl, "no parent dentry on inode %p\n", inode);
5233 WARN_ON(1);
5234 goto release; /* hrm... */
5235 }
5236 dname.hash = full_name_hash(parent, dname.name, dname.len);
5237 dentry = d_lookup(parent, &dname);
5238 dput(parent);
5239 if (!dentry)
5240 goto release;
5241
5242 spin_lock(&dentry->d_lock);
5243 di = ceph_dentry(dentry);
5244 switch (h->action) {
5245 case CEPH_MDS_LEASE_REVOKE:
5246 if (di->lease_session == session) {
5247 if (ceph_seq_cmp(di->lease_seq, seq) > 0)
5248 h->seq = cpu_to_le32(di->lease_seq);
5249 __ceph_mdsc_drop_dentry_lease(dentry);
5250 }
5251 release = 1;
5252 break;
5253
5254 case CEPH_MDS_LEASE_RENEW:
5255 if (di->lease_session == session &&
5256 di->lease_gen == atomic_read(&session->s_cap_gen) &&
5257 di->lease_renew_from &&
5258 di->lease_renew_after == 0) {
5259 unsigned long duration =
5260 msecs_to_jiffies(le32_to_cpu(h->duration_ms));
5261
5262 di->lease_seq = seq;
5263 di->time = di->lease_renew_from + duration;
5264 di->lease_renew_after = di->lease_renew_from +
5265 (duration >> 1);
5266 di->lease_renew_from = 0;
5267 }
5268 break;
5269 }
5270 spin_unlock(&dentry->d_lock);
5271 dput(dentry);
5272
5273 if (!release)
5274 goto out;
5275
5276 release:
5277 /* let's just reuse the same message */
5278 h->action = CEPH_MDS_LEASE_REVOKE_ACK;
5279 ceph_msg_get(msg);
5280 ceph_con_send(&session->s_con, msg);
5281
5282 out:
5283 mutex_unlock(&session->s_mutex);
5284 iput(inode);
5285
5286 ceph_dec_mds_stopping_blocker(mdsc);
5287 return;
5288
5289 bad:
5290 ceph_dec_mds_stopping_blocker(mdsc);
5291
5292 pr_err_client(cl, "corrupt lease message\n");
5293 ceph_msg_dump(msg);
5294 }
5295
5296 void ceph_mdsc_lease_send_msg(struct ceph_mds_session *session,
5297 struct dentry *dentry, char action,
5298 u32 seq)
5299 {
5300 struct ceph_client *cl = session->s_mdsc->fsc->client;
5301 struct ceph_msg *msg;
5302 struct ceph_mds_lease *lease;
5303 struct inode *dir;
5304 int len = sizeof(*lease) + sizeof(u32) + NAME_MAX;
5305
5306 doutc(cl, "identry %p %s to mds%d\n", dentry, ceph_lease_op_name(action),
5307 session->s_mds);
5308
5309 msg = ceph_msg_new(CEPH_MSG_CLIENT_LEASE, len, GFP_NOFS, false);
5310 if (!msg)
5311 return;
5312 lease = msg->front.iov_base;
5313 lease->action = action;
5314 lease->seq = cpu_to_le32(seq);
5315
5316 spin_lock(&dentry->d_lock);
5317 dir = d_inode(dentry->d_parent);
5318 lease->ino = cpu_to_le64(ceph_ino(dir));
5319 lease->first = lease->last = cpu_to_le64(ceph_snap(dir));
5320
5321 put_unaligned_le32(dentry->d_name.len, lease + 1);
5322 memcpy((void *)(lease + 1) + 4,
5323 dentry->d_name.name, dentry->d_name.len);
5324 spin_unlock(&dentry->d_lock);
5325
5326 ceph_con_send(&session->s_con, msg);
5327 }
5328
5329 /*
5330 * lock unlock the session, to wait ongoing session activities
5331 */
5332 static void lock_unlock_session(struct ceph_mds_session *s)
5333 {
5334 mutex_lock(&s->s_mutex);
5335 mutex_unlock(&s->s_mutex);
5336 }
5337
5338 static void maybe_recover_session(struct ceph_mds_client *mdsc)
5339 {
5340 struct ceph_client *cl = mdsc->fsc->client;
5341 struct ceph_fs_client *fsc = mdsc->fsc;
5342
5343 if (!ceph_test_mount_opt(fsc, CLEANRECOVER))
5344 return;
5345
5346 if (READ_ONCE(fsc->mount_state) != CEPH_MOUNT_MOUNTED)
5347 return;
5348
5349 if (!READ_ONCE(fsc->blocklisted))
5350 return;
5351
5352 pr_info_client(cl, "auto reconnect after blocklisted\n");
5353 ceph_force_reconnect(fsc->sb);
5354 }
5355
5356 bool check_session_state(struct ceph_mds_session *s)
5357 {
5358 struct ceph_client *cl = s->s_mdsc->fsc->client;
5359
5360 switch (s->s_state) {
5361 case CEPH_MDS_SESSION_OPEN:
5362 if (s->s_ttl && time_after(jiffies, s->s_ttl)) {
5363 s->s_state = CEPH_MDS_SESSION_HUNG;
5364 pr_info_client(cl, "mds%d hung\n", s->s_mds);
5365 }
5366 break;
5367 case CEPH_MDS_SESSION_CLOSING:
5368 case CEPH_MDS_SESSION_NEW:
5369 case CEPH_MDS_SESSION_RESTARTING:
5370 case CEPH_MDS_SESSION_CLOSED:
5371 case CEPH_MDS_SESSION_REJECTED:
5372 return false;
5373 }
5374
5375 return true;
5376 }
5377
5378 /*
5379 * If the sequence is incremented while we're waiting on a REQUEST_CLOSE reply,
5380 * then we need to retransmit that request.
5381 */
5382 void inc_session_sequence(struct ceph_mds_session *s)
5383 {
5384 struct ceph_client *cl = s->s_mdsc->fsc->client;
5385
5386 lockdep_assert_held(&s->s_mutex);
5387
5388 s->s_seq++;
5389
5390 if (s->s_state == CEPH_MDS_SESSION_CLOSING) {
5391 int ret;
5392
5393 doutc(cl, "resending session close request for mds%d\n", s->s_mds);
5394 ret = request_close_session(s);
5395 if (ret < 0)
5396 pr_err_client(cl, "unable to close session to mds%d: %d\n",
5397 s->s_mds, ret);
5398 }
5399 }
5400
5401 /*
5402 * delayed work -- periodically trim expired leases, renew caps with mds. If
5403 * the @delay parameter is set to 0 or if it's more than 5 secs, the default
5404 * workqueue delay value of 5 secs will be used.
5405 */
5406 static void schedule_delayed(struct ceph_mds_client *mdsc, unsigned long delay)
5407 {
5408 unsigned long max_delay = HZ * 5;
5409
5410 /* 5 secs default delay */
5411 if (!delay || (delay > max_delay))
5412 delay = max_delay;
5413 schedule_delayed_work(&mdsc->delayed_work,
5414 round_jiffies_relative(delay));
5415 }
5416
5417 static void delayed_work(struct work_struct *work)
5418 {
5419 struct ceph_mds_client *mdsc =
5420 container_of(work, struct ceph_mds_client, delayed_work.work);
5421 unsigned long delay;
5422 int renew_interval;
5423 int renew_caps;
5424 int i;
5425
5426 doutc(mdsc->fsc->client, "mdsc delayed_work\n");
5427
5428 if (mdsc->stopping >= CEPH_MDSC_STOPPING_FLUSHED)
5429 return;
5430
5431 mutex_lock(&mdsc->mutex);
5432 renew_interval = mdsc->mdsmap->m_session_timeout >> 2;
5433 renew_caps = time_after_eq(jiffies, HZ*renew_interval +
5434 mdsc->last_renew_caps);
5435 if (renew_caps)
5436 mdsc->last_renew_caps = jiffies;
5437
5438 for (i = 0; i < mdsc->max_sessions; i++) {
5439 struct ceph_mds_session *s = __ceph_lookup_mds_session(mdsc, i);
5440 if (!s)
5441 continue;
5442
5443 if (!check_session_state(s)) {
5444 ceph_put_mds_session(s);
5445 continue;
5446 }
5447 mutex_unlock(&mdsc->mutex);
5448
5449 ceph_flush_cap_releases(mdsc, s);
5450
5451 mutex_lock(&s->s_mutex);
5452 if (renew_caps)
5453 send_renew_caps(mdsc, s);
5454 else
5455 ceph_con_keepalive(&s->s_con);
5456 if (s->s_state == CEPH_MDS_SESSION_OPEN ||
5457 s->s_state == CEPH_MDS_SESSION_HUNG)
5458 ceph_send_cap_releases(mdsc, s);
5459 mutex_unlock(&s->s_mutex);
5460 ceph_put_mds_session(s);
5461
5462 mutex_lock(&mdsc->mutex);
5463 }
5464 mutex_unlock(&mdsc->mutex);
5465
5466 delay = ceph_check_delayed_caps(mdsc);
5467
5468 ceph_queue_cap_reclaim_work(mdsc);
5469
5470 ceph_trim_snapid_map(mdsc);
5471
5472 maybe_recover_session(mdsc);
5473
5474 schedule_delayed(mdsc, delay);
5475 }
5476
5477 int ceph_mdsc_init(struct ceph_fs_client *fsc)
5478
5479 {
5480 struct ceph_mds_client *mdsc;
5481 int err;
5482
5483 mdsc = kzalloc(sizeof(struct ceph_mds_client), GFP_NOFS);
5484 if (!mdsc)
5485 return -ENOMEM;
5486 mdsc->fsc = fsc;
5487 mutex_init(&mdsc->mutex);
5488 mdsc->mdsmap = kzalloc(sizeof(*mdsc->mdsmap), GFP_NOFS);
5489 if (!mdsc->mdsmap) {
5490 err = -ENOMEM;
5491 goto err_mdsc;
5492 }
5493
5494 init_completion(&mdsc->safe_umount_waiters);
5495 spin_lock_init(&mdsc->stopping_lock);
5496 atomic_set(&mdsc->stopping_blockers, 0);
5497 init_completion(&mdsc->stopping_waiter);
5498 init_waitqueue_head(&mdsc->session_close_wq);
5499 INIT_LIST_HEAD(&mdsc->waiting_for_map);
5500 mdsc->quotarealms_inodes = RB_ROOT;
5501 mutex_init(&mdsc->quotarealms_inodes_mutex);
5502 init_rwsem(&mdsc->snap_rwsem);
5503 mdsc->snap_realms = RB_ROOT;
5504 INIT_LIST_HEAD(&mdsc->snap_empty);
5505 spin_lock_init(&mdsc->snap_empty_lock);
5506 mdsc->request_tree = RB_ROOT;
5507 INIT_DELAYED_WORK(&mdsc->delayed_work, delayed_work);
5508 mdsc->last_renew_caps = jiffies;
5509 INIT_LIST_HEAD(&mdsc->cap_delay_list);
5510 #ifdef CONFIG_DEBUG_FS
5511 INIT_LIST_HEAD(&mdsc->cap_wait_list);
5512 #endif
5513 spin_lock_init(&mdsc->cap_delay_lock);
5514 INIT_LIST_HEAD(&mdsc->cap_unlink_delay_list);
5515 INIT_LIST_HEAD(&mdsc->snap_flush_list);
5516 spin_lock_init(&mdsc->snap_flush_lock);
5517 mdsc->last_cap_flush_tid = 1;
5518 INIT_LIST_HEAD(&mdsc->cap_flush_list);
5519 INIT_LIST_HEAD(&mdsc->cap_dirty_migrating);
5520 spin_lock_init(&mdsc->cap_dirty_lock);
5521 init_waitqueue_head(&mdsc->cap_flushing_wq);
5522 INIT_WORK(&mdsc->cap_reclaim_work, ceph_cap_reclaim_work);
5523 INIT_WORK(&mdsc->cap_unlink_work, ceph_cap_unlink_work);
5524 err = ceph_metric_init(&mdsc->metric);
5525 if (err)
5526 goto err_mdsmap;
5527
5528 spin_lock_init(&mdsc->dentry_list_lock);
5529 INIT_LIST_HEAD(&mdsc->dentry_leases);
5530 INIT_LIST_HEAD(&mdsc->dentry_dir_leases);
5531
5532 ceph_caps_init(mdsc);
5533 ceph_adjust_caps_max_min(mdsc, fsc->mount_options);
5534
5535 spin_lock_init(&mdsc->snapid_map_lock);
5536 mdsc->snapid_map_tree = RB_ROOT;
5537 INIT_LIST_HEAD(&mdsc->snapid_map_lru);
5538
5539 init_rwsem(&mdsc->pool_perm_rwsem);
5540 mdsc->pool_perm_tree = RB_ROOT;
5541
5542 strscpy(mdsc->nodename, utsname()->nodename,
5543 sizeof(mdsc->nodename));
5544
5545 fsc->mdsc = mdsc;
5546 return 0;
5547
5548 err_mdsmap:
5549 kfree(mdsc->mdsmap);
5550 err_mdsc:
5551 kfree(mdsc);
5552 return err;
5553 }
5554
5555 /*
5556 * Wait for safe replies on open mds requests. If we time out, drop
5557 * all requests from the tree to avoid dangling dentry refs.
5558 */
5559 static void wait_requests(struct ceph_mds_client *mdsc)
5560 {
5561 struct ceph_client *cl = mdsc->fsc->client;
5562 struct ceph_options *opts = mdsc->fsc->client->options;
5563 struct ceph_mds_request *req;
5564
5565 mutex_lock(&mdsc->mutex);
5566 if (__get_oldest_req(mdsc)) {
5567 mutex_unlock(&mdsc->mutex);
5568
5569 doutc(cl, "waiting for requests\n");
5570 wait_for_completion_timeout(&mdsc->safe_umount_waiters,
5571 ceph_timeout_jiffies(opts->mount_timeout));
5572
5573 /* tear down remaining requests */
5574 mutex_lock(&mdsc->mutex);
5575 while ((req = __get_oldest_req(mdsc))) {
5576 doutc(cl, "timed out on tid %llu\n", req->r_tid);
5577 list_del_init(&req->r_wait);
5578 __unregister_request(mdsc, req);
5579 }
5580 }
5581 mutex_unlock(&mdsc->mutex);
5582 doutc(cl, "done\n");
5583 }
5584
5585 void send_flush_mdlog(struct ceph_mds_session *s)
5586 {
5587 struct ceph_client *cl = s->s_mdsc->fsc->client;
5588 struct ceph_msg *msg;
5589
5590 /*
5591 * Pre-luminous MDS crashes when it sees an unknown session request
5592 */
5593 if (!CEPH_HAVE_FEATURE(s->s_con.peer_features, SERVER_LUMINOUS))
5594 return;
5595
5596 mutex_lock(&s->s_mutex);
5597 doutc(cl, "request mdlog flush to mds%d (%s)s seq %lld\n",
5598 s->s_mds, ceph_session_state_name(s->s_state), s->s_seq);
5599 msg = ceph_create_session_msg(CEPH_SESSION_REQUEST_FLUSH_MDLOG,
5600 s->s_seq);
5601 if (!msg) {
5602 pr_err_client(cl, "failed to request mdlog flush to mds%d (%s) seq %lld\n",
5603 s->s_mds, ceph_session_state_name(s->s_state), s->s_seq);
5604 } else {
5605 ceph_con_send(&s->s_con, msg);
5606 }
5607 mutex_unlock(&s->s_mutex);
5608 }
5609
5610 static int ceph_mds_auth_match(struct ceph_mds_client *mdsc,
5611 struct ceph_mds_cap_auth *auth,
5612 char *tpath)
5613 {
5614 const struct cred *cred = get_current_cred();
5615 u32 caller_uid = from_kuid(&init_user_ns, cred->fsuid);
5616 u32 caller_gid = from_kgid(&init_user_ns, cred->fsgid);
5617 struct ceph_client *cl = mdsc->fsc->client;
5618 const char *spath = mdsc->fsc->mount_options->server_path;
5619 bool gid_matched = false;
5620 u32 gid, tlen, len;
5621 int i, j;
5622
5623 doutc(cl, "match.uid %lld\n", auth->match.uid);
5624 if (auth->match.uid != MDS_AUTH_UID_ANY) {
5625 if (auth->match.uid != caller_uid)
5626 return 0;
5627 if (auth->match.num_gids) {
5628 for (i = 0; i < auth->match.num_gids; i++) {
5629 if (caller_gid == auth->match.gids[i])
5630 gid_matched = true;
5631 }
5632 if (!gid_matched && cred->group_info->ngroups) {
5633 for (i = 0; i < cred->group_info->ngroups; i++) {
5634 gid = from_kgid(&init_user_ns,
5635 cred->group_info->gid[i]);
5636 for (j = 0; j < auth->match.num_gids; j++) {
5637 if (gid == auth->match.gids[j]) {
5638 gid_matched = true;
5639 break;
5640 }
5641 }
5642 if (gid_matched)
5643 break;
5644 }
5645 }
5646 if (!gid_matched)
5647 return 0;
5648 }
5649 }
5650
5651 /* path match */
5652 if (auth->match.path) {
5653 if (!tpath)
5654 return 0;
5655
5656 tlen = strlen(tpath);
5657 len = strlen(auth->match.path);
5658 if (len) {
5659 char *_tpath = tpath;
5660 bool free_tpath = false;
5661 int m, n;
5662
5663 doutc(cl, "server path %s, tpath %s, match.path %s\n",
5664 spath, tpath, auth->match.path);
5665 if (spath && (m = strlen(spath)) != 1) {
5666 /* mount path + '/' + tpath + an extra space */
5667 n = m + 1 + tlen + 1;
5668 _tpath = kmalloc(n, GFP_NOFS);
5669 if (!_tpath)
5670 return -ENOMEM;
5671 /* remove the leading '/' */
5672 snprintf(_tpath, n, "%s/%s", spath + 1, tpath);
5673 free_tpath = true;
5674 tlen = strlen(_tpath);
5675 }
5676
5677 /*
5678 * Please note the tailing '/' for match.path has already
5679 * been removed when parsing.
5680 *
5681 * Remove the tailing '/' for the target path.
5682 */
5683 while (tlen && _tpath[tlen - 1] == '/') {
5684 _tpath[tlen - 1] = '\0';
5685 tlen -= 1;
5686 }
5687 doutc(cl, "_tpath %s\n", _tpath);
5688
5689 /*
5690 * In case first == _tpath && tlen == len:
5691 * match.path=/foo --> /foo _path=/foo --> match
5692 * match.path=/foo/ --> /foo _path=/foo --> match
5693 *
5694 * In case first == _tmatch.path && tlen > len:
5695 * match.path=/foo/ --> /foo _path=/foo/ --> match
5696 * match.path=/foo --> /foo _path=/foo/ --> match
5697 * match.path=/foo/ --> /foo _path=/foo/d --> match
5698 * match.path=/foo --> /foo _path=/food --> mismatch
5699 *
5700 * All the other cases --> mismatch
5701 */
5702 char *first = strstr(_tpath, auth->match.path);
5703 if (first != _tpath) {
5704 if (free_tpath)
5705 kfree(_tpath);
5706 return 0;
5707 }
5708
5709 if (tlen > len && _tpath[len] != '/') {
5710 if (free_tpath)
5711 kfree(_tpath);
5712 return 0;
5713 }
5714 }
5715 }
5716
5717 doutc(cl, "matched\n");
5718 return 1;
5719 }
5720
5721 int ceph_mds_check_access(struct ceph_mds_client *mdsc, char *tpath, int mask)
5722 {
5723 const struct cred *cred = get_current_cred();
5724 u32 caller_uid = from_kuid(&init_user_ns, cred->fsuid);
5725 u32 caller_gid = from_kgid(&init_user_ns, cred->fsgid);
5726 struct ceph_mds_cap_auth *rw_perms_s = NULL;
5727 struct ceph_client *cl = mdsc->fsc->client;
5728 bool root_squash_perms = true;
5729 int i, err;
5730
5731 doutc(cl, "tpath '%s', mask %d, caller_uid %d, caller_gid %d\n",
5732 tpath, mask, caller_uid, caller_gid);
5733
5734 for (i = 0; i < mdsc->s_cap_auths_num; i++) {
5735 struct ceph_mds_cap_auth *s = &mdsc->s_cap_auths[i];
5736
5737 err = ceph_mds_auth_match(mdsc, s, tpath);
5738 if (err < 0) {
5739 return err;
5740 } else if (err > 0) {
5741 /* always follow the last auth caps' permision */
5742 root_squash_perms = true;
5743 rw_perms_s = NULL;
5744 if ((mask & MAY_WRITE) && s->writeable &&
5745 s->match.root_squash && (!caller_uid || !caller_gid))
5746 root_squash_perms = false;
5747
5748 if (((mask & MAY_WRITE) && !s->writeable) ||
5749 ((mask & MAY_READ) && !s->readable))
5750 rw_perms_s = s;
5751 }
5752 }
5753
5754 doutc(cl, "root_squash_perms %d, rw_perms_s %p\n", root_squash_perms,
5755 rw_perms_s);
5756 if (root_squash_perms && rw_perms_s == NULL) {
5757 doutc(cl, "access allowed\n");
5758 return 0;
5759 }
5760
5761 if (!root_squash_perms) {
5762 doutc(cl, "root_squash is enabled and user(%d %d) isn't allowed to write",
5763 caller_uid, caller_gid);
5764 }
5765 if (rw_perms_s) {
5766 doutc(cl, "mds auth caps readable/writeable %d/%d while request r/w %d/%d",
5767 rw_perms_s->readable, rw_perms_s->writeable,
5768 !!(mask & MAY_READ), !!(mask & MAY_WRITE));
5769 }
5770 doutc(cl, "access denied\n");
5771 return -EACCES;
5772 }
5773
5774 /*
5775 * called before mount is ro, and before dentries are torn down.
5776 * (hmm, does this still race with new lookups?)
5777 */
5778 void ceph_mdsc_pre_umount(struct ceph_mds_client *mdsc)
5779 {
5780 doutc(mdsc->fsc->client, "begin\n");
5781 mdsc->stopping = CEPH_MDSC_STOPPING_BEGIN;
5782
5783 ceph_mdsc_iterate_sessions(mdsc, send_flush_mdlog, true);
5784 ceph_mdsc_iterate_sessions(mdsc, lock_unlock_session, false);
5785 ceph_flush_dirty_caps(mdsc);
5786 wait_requests(mdsc);
5787
5788 /*
5789 * wait for reply handlers to drop their request refs and
5790 * their inode/dcache refs
5791 */
5792 ceph_msgr_flush();
5793
5794 ceph_cleanup_quotarealms_inodes(mdsc);
5795 doutc(mdsc->fsc->client, "done\n");
5796 }
5797
5798 /*
5799 * flush the mdlog and wait for all write mds requests to flush.
5800 */
5801 static void flush_mdlog_and_wait_mdsc_unsafe_requests(struct ceph_mds_client *mdsc,
5802 u64 want_tid)
5803 {
5804 struct ceph_client *cl = mdsc->fsc->client;
5805 struct ceph_mds_request *req = NULL, *nextreq;
5806 struct ceph_mds_session *last_session = NULL;
5807 struct rb_node *n;
5808
5809 mutex_lock(&mdsc->mutex);
5810 doutc(cl, "want %lld\n", want_tid);
5811 restart:
5812 req = __get_oldest_req(mdsc);
5813 while (req && req->r_tid <= want_tid) {
5814 /* find next request */
5815 n = rb_next(&req->r_node);
5816 if (n)
5817 nextreq = rb_entry(n, struct ceph_mds_request, r_node);
5818 else
5819 nextreq = NULL;
5820 if (req->r_op != CEPH_MDS_OP_SETFILELOCK &&
5821 (req->r_op & CEPH_MDS_OP_WRITE)) {
5822 struct ceph_mds_session *s = req->r_session;
5823
5824 if (!s) {
5825 req = nextreq;
5826 continue;
5827 }
5828
5829 /* write op */
5830 ceph_mdsc_get_request(req);
5831 if (nextreq)
5832 ceph_mdsc_get_request(nextreq);
5833 s = ceph_get_mds_session(s);
5834 mutex_unlock(&mdsc->mutex);
5835
5836 /* send flush mdlog request to MDS */
5837 if (last_session != s) {
5838 send_flush_mdlog(s);
5839 ceph_put_mds_session(last_session);
5840 last_session = s;
5841 } else {
5842 ceph_put_mds_session(s);
5843 }
5844 doutc(cl, "wait on %llu (want %llu)\n",
5845 req->r_tid, want_tid);
5846 wait_for_completion(&req->r_safe_completion);
5847
5848 mutex_lock(&mdsc->mutex);
5849 ceph_mdsc_put_request(req);
5850 if (!nextreq)
5851 break; /* next dne before, so we're done! */
5852 if (RB_EMPTY_NODE(&nextreq->r_node)) {
5853 /* next request was removed from tree */
5854 ceph_mdsc_put_request(nextreq);
5855 goto restart;
5856 }
5857 ceph_mdsc_put_request(nextreq); /* won't go away */
5858 }
5859 req = nextreq;
5860 }
5861 mutex_unlock(&mdsc->mutex);
5862 ceph_put_mds_session(last_session);
5863 doutc(cl, "done\n");
5864 }
5865
5866 void ceph_mdsc_sync(struct ceph_mds_client *mdsc)
5867 {
5868 struct ceph_client *cl = mdsc->fsc->client;
5869 u64 want_tid, want_flush;
5870
5871 if (READ_ONCE(mdsc->fsc->mount_state) >= CEPH_MOUNT_SHUTDOWN)
5872 return;
5873
5874 doutc(cl, "sync\n");
5875 mutex_lock(&mdsc->mutex);
5876 want_tid = mdsc->last_tid;
5877 mutex_unlock(&mdsc->mutex);
5878
5879 ceph_flush_dirty_caps(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 */
5899 static 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 */
5909 void 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
5967 void 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
6001 static 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 ceph_pool_perm_destroy(mdsc);
6019 }
6020
6021 void ceph_mdsc_destroy(struct ceph_fs_client *fsc)
6022 {
6023 struct ceph_mds_client *mdsc = fsc->mdsc;
6024 doutc(fsc->client, "%p\n", mdsc);
6025
6026 if (!mdsc)
6027 return;
6028
6029 /* flush out any connection work with references to us */
6030 ceph_msgr_flush();
6031
6032 ceph_mdsc_stop(mdsc);
6033
6034 ceph_metric_destroy(&mdsc->metric);
6035
6036 fsc->mdsc = NULL;
6037 kfree(mdsc);
6038 doutc(fsc->client, "%p done\n", mdsc);
6039 }
6040
6041 void ceph_mdsc_handle_fsmap(struct ceph_mds_client *mdsc, struct ceph_msg *msg)
6042 {
6043 struct ceph_fs_client *fsc = mdsc->fsc;
6044 struct ceph_client *cl = fsc->client;
6045 const char *mds_namespace = fsc->mount_options->mds_namespace;
6046 void *p = msg->front.iov_base;
6047 void *end = p + msg->front.iov_len;
6048 u32 epoch;
6049 u32 num_fs;
6050 u32 mount_fscid = (u32)-1;
6051 int err = -EINVAL;
6052
6053 ceph_decode_need(&p, end, sizeof(u32), bad);
6054 epoch = ceph_decode_32(&p);
6055
6056 doutc(cl, "epoch %u\n", epoch);
6057
6058 /* struct_v, struct_cv, map_len, epoch, legacy_client_fscid */
6059 ceph_decode_skip_n(&p, end, 2 + sizeof(u32) * 3, bad);
6060
6061 ceph_decode_32_safe(&p, end, num_fs, bad);
6062 while (num_fs-- > 0) {
6063 void *info_p, *info_end;
6064 u32 info_len;
6065 u32 fscid, namelen;
6066
6067 ceph_decode_need(&p, end, 2 + sizeof(u32), bad);
6068 p += 2; // info_v, info_cv
6069 info_len = ceph_decode_32(&p);
6070 ceph_decode_need(&p, end, info_len, bad);
6071 info_p = p;
6072 info_end = p + info_len;
6073 p = info_end;
6074
6075 ceph_decode_need(&info_p, info_end, sizeof(u32) * 2, bad);
6076 fscid = ceph_decode_32(&info_p);
6077 namelen = ceph_decode_32(&info_p);
6078 ceph_decode_need(&info_p, info_end, namelen, bad);
6079
6080 if (mds_namespace &&
6081 strlen(mds_namespace) == namelen &&
6082 !strncmp(mds_namespace, (char *)info_p, namelen)) {
6083 mount_fscid = fscid;
6084 break;
6085 }
6086 }
6087
6088 ceph_monc_got_map(&fsc->client->monc, CEPH_SUB_FSMAP, epoch);
6089 if (mount_fscid != (u32)-1) {
6090 fsc->client->monc.fs_cluster_id = mount_fscid;
6091 ceph_monc_want_map(&fsc->client->monc, CEPH_SUB_MDSMAP,
6092 0, true);
6093 ceph_monc_renew_subs(&fsc->client->monc);
6094 } else {
6095 err = -ENOENT;
6096 goto err_out;
6097 }
6098 return;
6099
6100 bad:
6101 pr_err_client(cl, "error decoding fsmap %d. Shutting down mount.\n",
6102 err);
6103 ceph_umount_begin(mdsc->fsc->sb);
6104 ceph_msg_dump(msg);
6105 err_out:
6106 mutex_lock(&mdsc->mutex);
6107 mdsc->mdsmap_err = err;
6108 __wake_requests(mdsc, &mdsc->waiting_for_map);
6109 mutex_unlock(&mdsc->mutex);
6110 }
6111
6112 /*
6113 * handle mds map update.
6114 */
6115 void ceph_mdsc_handle_mdsmap(struct ceph_mds_client *mdsc, struct ceph_msg *msg)
6116 {
6117 struct ceph_client *cl = mdsc->fsc->client;
6118 u32 epoch;
6119 u32 maplen;
6120 void *p = msg->front.iov_base;
6121 void *end = p + msg->front.iov_len;
6122 struct ceph_mdsmap *newmap, *oldmap;
6123 struct ceph_fsid fsid;
6124 int err = -EINVAL;
6125
6126 ceph_decode_need(&p, end, sizeof(fsid)+2*sizeof(u32), bad);
6127 ceph_decode_copy(&p, &fsid, sizeof(fsid));
6128 if (ceph_check_fsid(mdsc->fsc->client, &fsid) < 0)
6129 return;
6130 epoch = ceph_decode_32(&p);
6131 maplen = ceph_decode_32(&p);
6132 doutc(cl, "epoch %u len %d\n", epoch, (int)maplen);
6133
6134 /* do we need it? */
6135 mutex_lock(&mdsc->mutex);
6136 if (mdsc->mdsmap && epoch <= mdsc->mdsmap->m_epoch) {
6137 doutc(cl, "epoch %u <= our %u\n", epoch, mdsc->mdsmap->m_epoch);
6138 mutex_unlock(&mdsc->mutex);
6139 return;
6140 }
6141
6142 newmap = ceph_mdsmap_decode(mdsc, &p, end, ceph_msgr2(mdsc->fsc->client));
6143 if (IS_ERR(newmap)) {
6144 err = PTR_ERR(newmap);
6145 goto bad_unlock;
6146 }
6147
6148 /* swap into place */
6149 if (mdsc->mdsmap) {
6150 oldmap = mdsc->mdsmap;
6151 mdsc->mdsmap = newmap;
6152 check_new_map(mdsc, newmap, oldmap);
6153 ceph_mdsmap_destroy(oldmap);
6154 } else {
6155 mdsc->mdsmap = newmap; /* first mds map */
6156 }
6157 mdsc->fsc->max_file_size = min((loff_t)mdsc->mdsmap->m_max_file_size,
6158 MAX_LFS_FILESIZE);
6159
6160 __wake_requests(mdsc, &mdsc->waiting_for_map);
6161 ceph_monc_got_map(&mdsc->fsc->client->monc, CEPH_SUB_MDSMAP,
6162 mdsc->mdsmap->m_epoch);
6163
6164 mutex_unlock(&mdsc->mutex);
6165 schedule_delayed(mdsc, 0);
6166 return;
6167
6168 bad_unlock:
6169 mutex_unlock(&mdsc->mutex);
6170 bad:
6171 pr_err_client(cl, "error decoding mdsmap %d. Shutting down mount.\n",
6172 err);
6173 ceph_umount_begin(mdsc->fsc->sb);
6174 ceph_msg_dump(msg);
6175 return;
6176 }
6177
6178 static struct ceph_connection *mds_get_con(struct ceph_connection *con)
6179 {
6180 struct ceph_mds_session *s = con->private;
6181
6182 if (ceph_get_mds_session(s))
6183 return con;
6184 return NULL;
6185 }
6186
6187 static void mds_put_con(struct ceph_connection *con)
6188 {
6189 struct ceph_mds_session *s = con->private;
6190
6191 ceph_put_mds_session(s);
6192 }
6193
6194 /*
6195 * if the client is unresponsive for long enough, the mds will kill
6196 * the session entirely.
6197 */
6198 static void mds_peer_reset(struct ceph_connection *con)
6199 {
6200 struct ceph_mds_session *s = con->private;
6201 struct ceph_mds_client *mdsc = s->s_mdsc;
6202
6203 pr_warn_client(mdsc->fsc->client, "mds%d closed our session\n",
6204 s->s_mds);
6205 if (READ_ONCE(mdsc->fsc->mount_state) != CEPH_MOUNT_FENCE_IO &&
6206 ceph_mdsmap_get_state(mdsc->mdsmap, s->s_mds) >= CEPH_MDS_STATE_RECONNECT)
6207 send_mds_reconnect(mdsc, s);
6208 }
6209
6210 static void mds_dispatch(struct ceph_connection *con, struct ceph_msg *msg)
6211 {
6212 struct ceph_mds_session *s = con->private;
6213 struct ceph_mds_client *mdsc = s->s_mdsc;
6214 struct ceph_client *cl = mdsc->fsc->client;
6215 int type = le16_to_cpu(msg->hdr.type);
6216
6217 mutex_lock(&mdsc->mutex);
6218 if (__verify_registered_session(mdsc, s) < 0) {
6219 mutex_unlock(&mdsc->mutex);
6220 goto out;
6221 }
6222 mutex_unlock(&mdsc->mutex);
6223
6224 switch (type) {
6225 case CEPH_MSG_MDS_MAP:
6226 ceph_mdsc_handle_mdsmap(mdsc, msg);
6227 break;
6228 case CEPH_MSG_FS_MAP_USER:
6229 ceph_mdsc_handle_fsmap(mdsc, msg);
6230 break;
6231 case CEPH_MSG_CLIENT_SESSION:
6232 handle_session(s, msg);
6233 break;
6234 case CEPH_MSG_CLIENT_REPLY:
6235 handle_reply(s, msg);
6236 break;
6237 case CEPH_MSG_CLIENT_REQUEST_FORWARD:
6238 handle_forward(mdsc, s, msg);
6239 break;
6240 case CEPH_MSG_CLIENT_CAPS:
6241 ceph_handle_caps(s, msg);
6242 break;
6243 case CEPH_MSG_CLIENT_SNAP:
6244 ceph_handle_snap(mdsc, s, msg);
6245 break;
6246 case CEPH_MSG_CLIENT_LEASE:
6247 handle_lease(mdsc, s, msg);
6248 break;
6249 case CEPH_MSG_CLIENT_QUOTA:
6250 ceph_handle_quota(mdsc, s, msg);
6251 break;
6252
6253 default:
6254 pr_err_client(cl, "received unknown message type %d %s\n",
6255 type, ceph_msg_type_name(type));
6256 }
6257 out:
6258 ceph_msg_put(msg);
6259 }
6260
6261 /*
6262 * authentication
6263 */
6264
6265 /*
6266 * Note: returned pointer is the address of a structure that's
6267 * managed separately. Caller must *not* attempt to free it.
6268 */
6269 static struct ceph_auth_handshake *
6270 mds_get_authorizer(struct ceph_connection *con, int *proto, int force_new)
6271 {
6272 struct ceph_mds_session *s = con->private;
6273 struct ceph_mds_client *mdsc = s->s_mdsc;
6274 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
6275 struct ceph_auth_handshake *auth = &s->s_auth;
6276 int ret;
6277
6278 ret = __ceph_auth_get_authorizer(ac, auth, CEPH_ENTITY_TYPE_MDS,
6279 force_new, proto, NULL, NULL);
6280 if (ret)
6281 return ERR_PTR(ret);
6282
6283 return auth;
6284 }
6285
6286 static int mds_add_authorizer_challenge(struct ceph_connection *con,
6287 void *challenge_buf, int challenge_buf_len)
6288 {
6289 struct ceph_mds_session *s = con->private;
6290 struct ceph_mds_client *mdsc = s->s_mdsc;
6291 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
6292
6293 return ceph_auth_add_authorizer_challenge(ac, s->s_auth.authorizer,
6294 challenge_buf, challenge_buf_len);
6295 }
6296
6297 static int mds_verify_authorizer_reply(struct ceph_connection *con)
6298 {
6299 struct ceph_mds_session *s = con->private;
6300 struct ceph_mds_client *mdsc = s->s_mdsc;
6301 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
6302 struct ceph_auth_handshake *auth = &s->s_auth;
6303
6304 return ceph_auth_verify_authorizer_reply(ac, auth->authorizer,
6305 auth->authorizer_reply_buf, auth->authorizer_reply_buf_len,
6306 NULL, NULL, NULL, NULL);
6307 }
6308
6309 static int mds_invalidate_authorizer(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
6315 ceph_auth_invalidate_authorizer(ac, CEPH_ENTITY_TYPE_MDS);
6316
6317 return ceph_monc_validate_auth(&mdsc->fsc->client->monc);
6318 }
6319
6320 static int mds_get_auth_request(struct ceph_connection *con,
6321 void *buf, int *buf_len,
6322 void **authorizer, int *authorizer_len)
6323 {
6324 struct ceph_mds_session *s = con->private;
6325 struct ceph_auth_client *ac = s->s_mdsc->fsc->client->monc.auth;
6326 struct ceph_auth_handshake *auth = &s->s_auth;
6327 int ret;
6328
6329 ret = ceph_auth_get_authorizer(ac, auth, CEPH_ENTITY_TYPE_MDS,
6330 buf, buf_len);
6331 if (ret)
6332 return ret;
6333
6334 *authorizer = auth->authorizer_buf;
6335 *authorizer_len = auth->authorizer_buf_len;
6336 return 0;
6337 }
6338
6339 static int mds_handle_auth_reply_more(struct ceph_connection *con,
6340 void *reply, int reply_len,
6341 void *buf, int *buf_len,
6342 void **authorizer, int *authorizer_len)
6343 {
6344 struct ceph_mds_session *s = con->private;
6345 struct ceph_auth_client *ac = s->s_mdsc->fsc->client->monc.auth;
6346 struct ceph_auth_handshake *auth = &s->s_auth;
6347 int ret;
6348
6349 ret = ceph_auth_handle_svc_reply_more(ac, auth, reply, reply_len,
6350 buf, buf_len);
6351 if (ret)
6352 return ret;
6353
6354 *authorizer = auth->authorizer_buf;
6355 *authorizer_len = auth->authorizer_buf_len;
6356 return 0;
6357 }
6358
6359 static int mds_handle_auth_done(struct ceph_connection *con,
6360 u64 global_id, void *reply, int reply_len,
6361 u8 *session_key, int *session_key_len,
6362 u8 *con_secret, int *con_secret_len)
6363 {
6364 struct ceph_mds_session *s = con->private;
6365 struct ceph_auth_client *ac = s->s_mdsc->fsc->client->monc.auth;
6366 struct ceph_auth_handshake *auth = &s->s_auth;
6367
6368 return ceph_auth_handle_svc_reply_done(ac, auth, reply, reply_len,
6369 session_key, session_key_len,
6370 con_secret, con_secret_len);
6371 }
6372
6373 static int mds_handle_auth_bad_method(struct ceph_connection *con,
6374 int used_proto, int result,
6375 const int *allowed_protos, int proto_cnt,
6376 const int *allowed_modes, int mode_cnt)
6377 {
6378 struct ceph_mds_session *s = con->private;
6379 struct ceph_mon_client *monc = &s->s_mdsc->fsc->client->monc;
6380 int ret;
6381
6382 if (ceph_auth_handle_bad_authorizer(monc->auth, CEPH_ENTITY_TYPE_MDS,
6383 used_proto, result,
6384 allowed_protos, proto_cnt,
6385 allowed_modes, mode_cnt)) {
6386 ret = ceph_monc_validate_auth(monc);
6387 if (ret)
6388 return ret;
6389 }
6390
6391 return -EACCES;
6392 }
6393
6394 static struct ceph_msg *mds_alloc_msg(struct ceph_connection *con,
6395 struct ceph_msg_header *hdr, int *skip)
6396 {
6397 struct ceph_msg *msg;
6398 int type = (int) le16_to_cpu(hdr->type);
6399 int front_len = (int) le32_to_cpu(hdr->front_len);
6400
6401 if (con->in_msg)
6402 return con->in_msg;
6403
6404 *skip = 0;
6405 msg = ceph_msg_new(type, front_len, GFP_NOFS, false);
6406 if (!msg) {
6407 pr_err("unable to allocate msg type %d len %d\n",
6408 type, front_len);
6409 return NULL;
6410 }
6411
6412 return msg;
6413 }
6414
6415 static int mds_sign_message(struct ceph_msg *msg)
6416 {
6417 struct ceph_mds_session *s = msg->con->private;
6418 struct ceph_auth_handshake *auth = &s->s_auth;
6419
6420 return ceph_auth_sign_message(auth, msg);
6421 }
6422
6423 static int mds_check_message_signature(struct ceph_msg *msg)
6424 {
6425 struct ceph_mds_session *s = msg->con->private;
6426 struct ceph_auth_handshake *auth = &s->s_auth;
6427
6428 return ceph_auth_check_message_signature(auth, msg);
6429 }
6430
6431 static const struct ceph_connection_operations mds_con_ops = {
6432 .get = mds_get_con,
6433 .put = mds_put_con,
6434 .alloc_msg = mds_alloc_msg,
6435 .dispatch = mds_dispatch,
6436 .peer_reset = mds_peer_reset,
6437 .get_authorizer = mds_get_authorizer,
6438 .add_authorizer_challenge = mds_add_authorizer_challenge,
6439 .verify_authorizer_reply = mds_verify_authorizer_reply,
6440 .invalidate_authorizer = mds_invalidate_authorizer,
6441 .sign_message = mds_sign_message,
6442 .check_message_signature = mds_check_message_signature,
6443 .get_auth_request = mds_get_auth_request,
6444 .handle_auth_reply_more = mds_handle_auth_reply_more,
6445 .handle_auth_done = mds_handle_auth_done,
6446 .handle_auth_bad_method = mds_handle_auth_bad_method,
6447 };
6448
6449 /* eof */
6450
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