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Merge tag 'mmc-v5.15-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/ulfh/mmc
[mirror_ubuntu-jammy-kernel.git] / fs / ceph / mds_client.c
CommitLineData
b2441318 1// SPDX-License-Identifier: GPL-2.0
3d14c5d2 2#include <linux/ceph/ceph_debug.h>
2f2dc053 3
496e5955 4#include <linux/fs.h>
2f2dc053 5#include <linux/wait.h>
5a0e3ad6 6#include <linux/slab.h>
54008399 7#include <linux/gfp.h>
2f2dc053 8#include <linux/sched.h>
3d14c5d2
YS		 9#include <linux/debugfs.h>
10#include <linux/seq_file.h>
3e0708b9 11#include <linux/ratelimit.h>
9ba1e224 12#include <linux/bits.h>
70c94820 13#include <linux/ktime.h>
d517b398 14#include <linux/bitmap.h>
2f2dc053 15
2f2dc053 16#include "super.h"
3d14c5d2
YS		 17#include "mds_client.h"
18
1fe60e51 19#include <linux/ceph/ceph_features.h>
3d14c5d2
YS		 20#include <linux/ceph/messenger.h>
21#include <linux/ceph/decode.h>
22#include <linux/ceph/pagelist.h>
23#include <linux/ceph/auth.h>
24#include <linux/ceph/debugfs.h>
2f2dc053 25
81c5a148
YZ		 26#define RECONNECT_MAX_SIZE (INT_MAX - PAGE_SIZE)
27
2f2dc053
SW		 28/*
29 * A cluster of MDS (metadata server) daemons is responsible for
30 * managing the file system namespace (the directory hierarchy and
31 * inodes) and for coordinating shared access to storage. Metadata is
32 * partitioning hierarchically across a number of servers, and that
33 * partition varies over time as the cluster adjusts the distribution
34 * in order to balance load.
35 *
36 * The MDS client is primarily responsible to managing synchronous
37 * metadata requests for operations like open, unlink, and so forth.
38 * If there is a MDS failure, we find out about it when we (possibly
39 * request and) receive a new MDS map, and can resubmit affected
40 * requests.
41 *
42 * For the most part, though, we take advantage of a lossless
43 * communications channel to the MDS, and do not need to worry about
44 * timing out or resubmitting requests.
45 *
46 * We maintain a stateful "session" with each MDS we interact with.
47 * Within each session, we sent periodic heartbeat messages to ensure
48 * any capabilities or leases we have been issues remain valid. If
49 * the session times out and goes stale, our leases and capabilities
50 * are no longer valid.
51 */
52
20cb34ae 53struct ceph_reconnect_state {
81c5a148
YZ		 54 struct ceph_mds_session *session;
55 int nr_caps, nr_realms;
20cb34ae 56 struct ceph_pagelist *pagelist;
121f22a1 57 unsigned msg_version;
81c5a148 58 bool allow_multi;
20cb34ae
SW		 59};
60
2f2dc053
SW		 61static void __wake_requests(struct ceph_mds_client *mdsc,
62 struct list_head *head);
e3ec8d68 63static void ceph_cap_release_work(struct work_struct *work);
37c4efc1 64static void ceph_cap_reclaim_work(struct work_struct *work);
2f2dc053 65
9e32789f 66static const struct ceph_connection_operations mds_con_ops;
2f2dc053
SW		 67
68
69/*
70 * mds reply parsing
71 */
72
b37fe1f9
YZ		 73static int parse_reply_info_quota(void **p, void *end,
74 struct ceph_mds_reply_info_in *info)
75{
76 u8 struct_v, struct_compat;
77 u32 struct_len;
78
79 ceph_decode_8_safe(p, end, struct_v, bad);
80 ceph_decode_8_safe(p, end, struct_compat, bad);
81 /* struct_v is expected to be >= 1. we only
82 * understand encoding with struct_compat == 1. */
83 if (!struct_v || struct_compat != 1)
84 goto bad;
85 ceph_decode_32_safe(p, end, struct_len, bad);
86 ceph_decode_need(p, end, struct_len, bad);
87 end = *p + struct_len;
88 ceph_decode_64_safe(p, end, info->max_bytes, bad);
89 ceph_decode_64_safe(p, end, info->max_files, bad);
90 *p = end;
91 return 0;
92bad:
93 return -EIO;
94}
95
2f2dc053
SW		 96/*
97 * parse individual inode info
98 */
99static int parse_reply_info_in(void **p, void *end,
14303d20 100 struct ceph_mds_reply_info_in *info,
12b4629a 101 u64 features)
2f2dc053 102{
b37fe1f9
YZ		 103 int err = 0;
104 u8 struct_v = 0;
2f2dc053 105
b37fe1f9
YZ		 106 if (features == (u64)-1) {
107 u32 struct_len;
108 u8 struct_compat;
109 ceph_decode_8_safe(p, end, struct_v, bad);
110 ceph_decode_8_safe(p, end, struct_compat, bad);
111 /* struct_v is expected to be >= 1. we only understand
112 * encoding with struct_compat == 1. */
113 if (!struct_v || struct_compat != 1)
114 goto bad;
115 ceph_decode_32_safe(p, end, struct_len, bad);
116 ceph_decode_need(p, end, struct_len, bad);
117 end = *p + struct_len;
118 }
119
120 ceph_decode_need(p, end, sizeof(struct ceph_mds_reply_inode), bad);
2f2dc053
SW		 121 info->in = *p;
122 *p += sizeof(struct ceph_mds_reply_inode) +
123 sizeof(*info->in->fragtree.splits) *
124 le32_to_cpu(info->in->fragtree.nsplits);
125
126 ceph_decode_32_safe(p, end, info->symlink_len, bad);
127 ceph_decode_need(p, end, info->symlink_len, bad);
128 info->symlink = *p;
129 *p += info->symlink_len;
130
23c625ce
ID		 131 ceph_decode_copy_safe(p, end, &info->dir_layout,
132 sizeof(info->dir_layout), bad);
2f2dc053
SW		 133 ceph_decode_32_safe(p, end, info->xattr_len, bad);
134 ceph_decode_need(p, end, info->xattr_len, bad);
135 info->xattr_data = *p;
136 *p += info->xattr_len;
fb01d1f8 137
b37fe1f9
YZ		 138 if (features == (u64)-1) {
139 /* inline data */
fb01d1f8
YZ		 140 ceph_decode_64_safe(p, end, info->inline_version, bad);
141 ceph_decode_32_safe(p, end, info->inline_len, bad);
142 ceph_decode_need(p, end, info->inline_len, bad);
143 info->inline_data = *p;
144 *p += info->inline_len;
b37fe1f9
YZ		 145 /* quota */
146 err = parse_reply_info_quota(p, end, info);
147 if (err < 0)
148 goto out_bad;
149 /* pool namespace */
150 ceph_decode_32_safe(p, end, info->pool_ns_len, bad);
151 if (info->pool_ns_len > 0) {
152 ceph_decode_need(p, end, info->pool_ns_len, bad);
153 info->pool_ns_data = *p;
154 *p += info->pool_ns_len;
155 }
245ce991
JL		 156
157 /* btime */
158 ceph_decode_need(p, end, sizeof(info->btime), bad);
159 ceph_decode_copy(p, &info->btime, sizeof(info->btime));
160
161 /* change attribute */
a35ead31 162 ceph_decode_64_safe(p, end, info->change_attr, bad);
fb01d1f8 163
08796873
YZ		 164 /* dir pin */
165 if (struct_v >= 2) {
166 ceph_decode_32_safe(p, end, info->dir_pin, bad);
167 } else {
168 info->dir_pin = -ENODATA;
169 }
170
193e7b37
DD		 171 /* snapshot birth time, remains zero for v<=2 */
172 if (struct_v >= 3) {
173 ceph_decode_need(p, end, sizeof(info->snap_btime), bad);
174 ceph_decode_copy(p, &info->snap_btime,
175 sizeof(info->snap_btime));
176 } else {
177 memset(&info->snap_btime, 0, sizeof(info->snap_btime));
178 }
179
e7f72952
YC		 180 /* snapshot count, remains zero for v<=3 */
181 if (struct_v >= 4) {
182 ceph_decode_64_safe(p, end, info->rsnaps, bad);
183 } else {
184 info->rsnaps = 0;
185 }
186
b37fe1f9
YZ		 187 *p = end;
188 } else {
189 if (features & CEPH_FEATURE_MDS_INLINE_DATA) {
190 ceph_decode_64_safe(p, end, info->inline_version, bad);
191 ceph_decode_32_safe(p, end, info->inline_len, bad);
192 ceph_decode_need(p, end, info->inline_len, bad);
193 info->inline_data = *p;
194 *p += info->inline_len;
195 } else
196 info->inline_version = CEPH_INLINE_NONE;
197
198 if (features & CEPH_FEATURE_MDS_QUOTA) {
199 err = parse_reply_info_quota(p, end, info);
200 if (err < 0)
201 goto out_bad;
202 } else {
203 info->max_bytes = 0;
204 info->max_files = 0;
205 }
206
207 info->pool_ns_len = 0;
208 info->pool_ns_data = NULL;
209 if (features & CEPH_FEATURE_FS_FILE_LAYOUT_V2) {
210 ceph_decode_32_safe(p, end, info->pool_ns_len, bad);
211 if (info->pool_ns_len > 0) {
212 ceph_decode_need(p, end, info->pool_ns_len, bad);
213 info->pool_ns_data = *p;
214 *p += info->pool_ns_len;
215 }
216 }
08796873 217
245ce991
JL		 218 if (features & CEPH_FEATURE_FS_BTIME) {
219 ceph_decode_need(p, end, sizeof(info->btime), bad);
220 ceph_decode_copy(p, &info->btime, sizeof(info->btime));
a35ead31 221 ceph_decode_64_safe(p, end, info->change_attr, bad);
245ce991
JL		 222 }
223
08796873 224 info->dir_pin = -ENODATA;
e7f72952 225 /* info->snap_btime and info->rsnaps remain zero */
b37fe1f9
YZ		 226 }
227 return 0;
228bad:
229 err = -EIO;
230out_bad:
231 return err;
232}
233
234static int parse_reply_info_dir(void **p, void *end,
235 struct ceph_mds_reply_dirfrag **dirfrag,
236 u64 features)
237{
238 if (features == (u64)-1) {
fb18a575
LH		 239 u8 struct_v, struct_compat;
240 u32 struct_len;
fb18a575
LH		 241 ceph_decode_8_safe(p, end, struct_v, bad);
242 ceph_decode_8_safe(p, end, struct_compat, bad);
b37fe1f9
YZ		 243 /* struct_v is expected to be >= 1. we only understand
244 * encoding whose struct_compat == 1. */
245 if (!struct_v || struct_compat != 1)
fb18a575
LH		 246 goto bad;
247 ceph_decode_32_safe(p, end, struct_len, bad);
248 ceph_decode_need(p, end, struct_len, bad);
b37fe1f9 249 end = *p + struct_len;
fb18a575
LH		 250 }
251
b37fe1f9
YZ		 252 ceph_decode_need(p, end, sizeof(**dirfrag), bad);
253 *dirfrag = *p;
254 *p += sizeof(**dirfrag) + sizeof(u32) * le32_to_cpu((*dirfrag)->ndist);
255 if (unlikely(*p > end))
256 goto bad;
257 if (features == (u64)-1)
258 *p = end;
259 return 0;
260bad:
261 return -EIO;
262}
263
264static int parse_reply_info_lease(void **p, void *end,
265 struct ceph_mds_reply_lease **lease,
266 u64 features)
267{
268 if (features == (u64)-1) {
269 u8 struct_v, struct_compat;
270 u32 struct_len;
271 ceph_decode_8_safe(p, end, struct_v, bad);
272 ceph_decode_8_safe(p, end, struct_compat, bad);
273 /* struct_v is expected to be >= 1. we only understand
274 * encoding whose struct_compat == 1. */
275 if (!struct_v || struct_compat != 1)
276 goto bad;
277 ceph_decode_32_safe(p, end, struct_len, bad);
278 ceph_decode_need(p, end, struct_len, bad);
279 end = *p + struct_len;
5ea5c5e0
YZ		 280 }
281
b37fe1f9
YZ		 282 ceph_decode_need(p, end, sizeof(**lease), bad);
283 *lease = *p;
284 *p += sizeof(**lease);
285 if (features == (u64)-1)
286 *p = end;
2f2dc053
SW		 287 return 0;
288bad:
b37fe1f9 289 return -EIO;
2f2dc053
SW		 290}
291
292/*
293 * parse a normal reply, which may contain a (dir+)dentry and/or a
294 * target inode.
295 */
296static int parse_reply_info_trace(void **p, void *end,
14303d20 297 struct ceph_mds_reply_info_parsed *info,
12b4629a 298 u64 features)
2f2dc053
SW		 299{
300 int err;
301
302 if (info->head->is_dentry) {
14303d20 303 err = parse_reply_info_in(p, end, &info->diri, features);
2f2dc053
SW		 304 if (err < 0)
305 goto out_bad;
306
b37fe1f9
YZ		 307 err = parse_reply_info_dir(p, end, &info->dirfrag, features);
308 if (err < 0)
309 goto out_bad;
2f2dc053
SW		 310
311 ceph_decode_32_safe(p, end, info->dname_len, bad);
312 ceph_decode_need(p, end, info->dname_len, bad);
313 info->dname = *p;
314 *p += info->dname_len;
b37fe1f9
YZ		 315
316 err = parse_reply_info_lease(p, end, &info->dlease, features);
317 if (err < 0)
318 goto out_bad;
2f2dc053
SW		 319 }
320
321 if (info->head->is_target) {
14303d20 322 err = parse_reply_info_in(p, end, &info->targeti, features);
2f2dc053
SW		 323 if (err < 0)
324 goto out_bad;
325 }
326
327 if (unlikely(*p != end))
328 goto bad;
329 return 0;
330
331bad:
332 err = -EIO;
333out_bad:
334 pr_err("problem parsing mds trace %d\n", err);
335 return err;
336}
337
338/*
339 * parse readdir results
340 */
b37fe1f9 341static int parse_reply_info_readdir(void **p, void *end,
14303d20 342 struct ceph_mds_reply_info_parsed *info,
12b4629a 343 u64 features)
2f2dc053
SW		 344{
345 u32 num, i = 0;
346 int err;
347
b37fe1f9
YZ		 348 err = parse_reply_info_dir(p, end, &info->dir_dir, features);
349 if (err < 0)
350 goto out_bad;
2f2dc053
SW		 351
352 ceph_decode_need(p, end, sizeof(num) + 2, bad);
c89136ea 353 num = ceph_decode_32(p);
956d39d6
YZ		 354 {
355 u16 flags = ceph_decode_16(p);
356 info->dir_end = !!(flags & CEPH_READDIR_FRAG_END);
357 info->dir_complete = !!(flags & CEPH_READDIR_FRAG_COMPLETE);
f3c4ebe6 358 info->hash_order = !!(flags & CEPH_READDIR_HASH_ORDER);
79162547 359 info->offset_hash = !!(flags & CEPH_READDIR_OFFSET_HASH);
956d39d6 360 }
2f2dc053
SW		 361 if (num == 0)
362 goto done;
363
2a5beea3
YZ		 364 BUG_ON(!info->dir_entries);
365 if ((unsigned long)(info->dir_entries + num) >
366 (unsigned long)info->dir_entries + info->dir_buf_size) {
54008399
YZ		 367 pr_err("dir contents are larger than expected\n");
368 WARN_ON(1);
369 goto bad;
370 }
2f2dc053 371
54008399 372 info->dir_nr = num;
2f2dc053 373 while (num) {
2a5beea3 374 struct ceph_mds_reply_dir_entry *rde = info->dir_entries + i;
2f2dc053 375 /* dentry */
b37fe1f9 376 ceph_decode_32_safe(p, end, rde->name_len, bad);
2a5beea3
YZ		 377 ceph_decode_need(p, end, rde->name_len, bad);
378 rde->name = *p;
379 *p += rde->name_len;
380 dout("parsed dir dname '%.*s'\n", rde->name_len, rde->name);
2f2dc053 381
b37fe1f9
YZ		 382 /* dentry lease */
383 err = parse_reply_info_lease(p, end, &rde->lease, features);
384 if (err)
385 goto out_bad;
2f2dc053 386 /* inode */
2a5beea3 387 err = parse_reply_info_in(p, end, &rde->inode, features);
2f2dc053
SW		 388 if (err < 0)
389 goto out_bad;
8974eebd
YZ		 390 /* ceph_readdir_prepopulate() will update it */
391 rde->offset = 0;
2f2dc053
SW		 392 i++;
393 num--;
394 }
395
396done:
1d3f8723
JL		 397 /* Skip over any unrecognized fields */
398 *p = end;
2f2dc053
SW		 399 return 0;
400
401bad:
402 err = -EIO;
403out_bad:
404 pr_err("problem parsing dir contents %d\n", err);
405 return err;
406}
407
25933abd
HS		 408/*
409 * parse fcntl F_GETLK results
410 */
411static int parse_reply_info_filelock(void **p, void *end,
14303d20 412 struct ceph_mds_reply_info_parsed *info,
12b4629a 413 u64 features)
25933abd
HS		 414{
415 if (*p + sizeof(*info->filelock_reply) > end)
416 goto bad;
417
418 info->filelock_reply = *p;
25933abd 419
1d3f8723
JL		 420 /* Skip over any unrecognized fields */
421 *p = end;
25933abd 422 return 0;
25933abd
HS		 423bad:
424 return -EIO;
425}
426
d4846487
JL		 427
428#if BITS_PER_LONG == 64
429
430#define DELEGATED_INO_AVAILABLE xa_mk_value(1)
431
432static int ceph_parse_deleg_inos(void **p, void *end,
433 struct ceph_mds_session *s)
434{
435 u32 sets;
436
437 ceph_decode_32_safe(p, end, sets, bad);
438 dout("got %u sets of delegated inodes\n", sets);
439 while (sets--) {
440 u64 start, len, ino;
441
442 ceph_decode_64_safe(p, end, start, bad);
443 ceph_decode_64_safe(p, end, len, bad);
d4f6b31d
JL		 444
445 /* Don't accept a delegation of system inodes */
446 if (start < CEPH_INO_SYSTEM_BASE) {
447 pr_warn_ratelimited("ceph: ignoring reserved inode range delegation (start=0x%llx len=0x%llx)\n",
448 start, len);
449 continue;
450 }
d4846487
JL		 451 while (len--) {
452 int err = xa_insert(&s->s_delegated_inos, ino = start++,
453 DELEGATED_INO_AVAILABLE,
454 GFP_KERNEL);
455 if (!err) {
456 dout("added delegated inode 0x%llx\n",
457 start - 1);
458 } else if (err == -EBUSY) {
459 pr_warn("ceph: MDS delegated inode 0x%llx more than once.\n",
460 start - 1);
461 } else {
462 return err;
463 }
464 }
465 }
466 return 0;
467bad:
468 return -EIO;
469}
470
471u64 ceph_get_deleg_ino(struct ceph_mds_session *s)
472{
473 unsigned long ino;
474 void *val;
475
476 xa_for_each(&s->s_delegated_inos, ino, val) {
477 val = xa_erase(&s->s_delegated_inos, ino);
478 if (val == DELEGATED_INO_AVAILABLE)
479 return ino;
480 }
481 return 0;
482}
483
484int ceph_restore_deleg_ino(struct ceph_mds_session *s, u64 ino)
485{
486 return xa_insert(&s->s_delegated_inos, ino, DELEGATED_INO_AVAILABLE,
487 GFP_KERNEL);
488}
489#else /* BITS_PER_LONG == 64 */
490/*
491 * FIXME: xarrays can't handle 64-bit indexes on a 32-bit arch. For now, just
492 * ignore delegated_inos on 32 bit arch. Maybe eventually add xarrays for top
493 * and bottom words?
494 */
495static int ceph_parse_deleg_inos(void **p, void *end,
496 struct ceph_mds_session *s)
497{
498 u32 sets;
499
500 ceph_decode_32_safe(p, end, sets, bad);
501 if (sets)
502 ceph_decode_skip_n(p, end, sets * 2 * sizeof(__le64), bad);
503 return 0;
504bad:
505 return -EIO;
506}
507
508u64 ceph_get_deleg_ino(struct ceph_mds_session *s)
509{
510 return 0;
511}
512
513int ceph_restore_deleg_ino(struct ceph_mds_session *s, u64 ino)
514{
515 return 0;
516}
517#endif /* BITS_PER_LONG == 64 */
518
6e8575fa
SL		 519/*
520 * parse create results
521 */
522static int parse_reply_info_create(void **p, void *end,
523 struct ceph_mds_reply_info_parsed *info,
d4846487 524 u64 features, struct ceph_mds_session *s)
6e8575fa 525{
d4846487
JL		 526 int ret;
527
b37fe1f9
YZ		 528 if (features == (u64)-1 ||
529 (features & CEPH_FEATURE_REPLY_CREATE_INODE)) {
6e8575fa 530 if (*p == end) {
d4846487 531 /* Malformed reply? */
6e8575fa 532 info->has_create_ino = false;
d4846487 533 } else if (test_bit(CEPHFS_FEATURE_DELEG_INO, &s->s_features)) {
6e8575fa 534 info->has_create_ino = true;
06a1ad43
JL		 535 /* struct_v, struct_compat, and len */
536 ceph_decode_skip_n(p, end, 2 + sizeof(u32), bad);
d4846487
JL		 537 ceph_decode_64_safe(p, end, info->ino, bad);
538 ret = ceph_parse_deleg_inos(p, end, s);
539 if (ret)
540 return ret;
541 } else {
542 /* legacy */
1d3f8723 543 ceph_decode_64_safe(p, end, info->ino, bad);
d4846487 544 info->has_create_ino = true;
6e8575fa 545 }
1d3f8723
JL		 546 } else {
547 if (*p != end)
548 goto bad;
6e8575fa
SL		 549 }
550
1d3f8723
JL		 551 /* Skip over any unrecognized fields */
552 *p = end;
6e8575fa 553 return 0;
6e8575fa
SL		 554bad:
555 return -EIO;
556}
557
25933abd
HS		 558/*
559 * parse extra results
560 */
561static int parse_reply_info_extra(void **p, void *end,
14303d20 562 struct ceph_mds_reply_info_parsed *info,
d4846487 563 u64 features, struct ceph_mds_session *s)
25933abd 564{
6df8c9d8
JL		 565 u32 op = le32_to_cpu(info->head->op);
566
567 if (op == CEPH_MDS_OP_GETFILELOCK)
14303d20 568 return parse_reply_info_filelock(p, end, info, features);
6df8c9d8 569 else if (op == CEPH_MDS_OP_READDIR || op == CEPH_MDS_OP_LSSNAP)
b37fe1f9 570 return parse_reply_info_readdir(p, end, info, features);
6df8c9d8 571 else if (op == CEPH_MDS_OP_CREATE)
d4846487 572 return parse_reply_info_create(p, end, info, features, s);
6e8575fa
SL		 573 else
574 return -EIO;
25933abd
HS		 575}
576
2f2dc053
SW		 577/*
578 * parse entire mds reply
579 */
d4846487 580static int parse_reply_info(struct ceph_mds_session *s, struct ceph_msg *msg,
14303d20 581 struct ceph_mds_reply_info_parsed *info,
12b4629a 582 u64 features)
2f2dc053
SW		 583{
584 void *p, *end;
585 u32 len;
586 int err;
587
588 info->head = msg->front.iov_base;
589 p = msg->front.iov_base + sizeof(struct ceph_mds_reply_head);
590 end = p + msg->front.iov_len - sizeof(struct ceph_mds_reply_head);
591
592 /* trace */
593 ceph_decode_32_safe(&p, end, len, bad);
594 if (len > 0) {
32852a81 595 ceph_decode_need(&p, end, len, bad);
14303d20 596 err = parse_reply_info_trace(&p, p+len, info, features);
2f2dc053
SW		 597 if (err < 0)
598 goto out_bad;
599 }
600
25933abd 601 /* extra */
2f2dc053
SW		 602 ceph_decode_32_safe(&p, end, len, bad);
603 if (len > 0) {
32852a81 604 ceph_decode_need(&p, end, len, bad);
d4846487 605 err = parse_reply_info_extra(&p, p+len, info, features, s);
2f2dc053
SW		 606 if (err < 0)
607 goto out_bad;
608 }
609
610 /* snap blob */
611 ceph_decode_32_safe(&p, end, len, bad);
612 info->snapblob_len = len;
613 info->snapblob = p;
614 p += len;
615
616 if (p != end)
617 goto bad;
618 return 0;
619
620bad:
621 err = -EIO;
622out_bad:
623 pr_err("mds parse_reply err %d\n", err);
624 return err;
625}
626
627static void destroy_reply_info(struct ceph_mds_reply_info_parsed *info)
628{
2a5beea3 629 if (!info->dir_entries)
54008399 630 return;
2a5beea3 631 free_pages((unsigned long)info->dir_entries, get_order(info->dir_buf_size));
2f2dc053
SW		 632}
633
634
635/*
636 * sessions
637 */
a687ecaf 638const char *ceph_session_state_name(int s)
2f2dc053
SW		 639{
640 switch (s) {
641 case CEPH_MDS_SESSION_NEW: return "new";
642 case CEPH_MDS_SESSION_OPENING: return "opening";
643 case CEPH_MDS_SESSION_OPEN: return "open";
644 case CEPH_MDS_SESSION_HUNG: return "hung";
645 case CEPH_MDS_SESSION_CLOSING: return "closing";
4d681c2f 646 case CEPH_MDS_SESSION_CLOSED: return "closed";
44ca18f2 647 case CEPH_MDS_SESSION_RESTARTING: return "restarting";
2f2dc053 648 case CEPH_MDS_SESSION_RECONNECTING: return "reconnecting";
fcff415c 649 case CEPH_MDS_SESSION_REJECTED: return "rejected";
2f2dc053
SW		 650 default: return "???";
651 }
652}
653
5b3248c6 654struct ceph_mds_session *ceph_get_mds_session(struct ceph_mds_session *s)
2f2dc053 655{
9f358999 656 if (refcount_inc_not_zero(&s->s_ref))
2f2dc053 657 return s;
9f358999 658 return NULL;
2f2dc053
SW		 659}
660
661void ceph_put_mds_session(struct ceph_mds_session *s)
662{
7e65624d
JL		 663 if (IS_ERR_OR_NULL(s))
664 return;
665
3997c01d 666 if (refcount_dec_and_test(&s->s_ref)) {
6c4a1915 667 if (s->s_auth.authorizer)
6c1ea260 668 ceph_auth_destroy_authorizer(s->s_auth.authorizer);
88828190 669 WARN_ON(mutex_is_locked(&s->s_mutex));
d4846487 670 xa_destroy(&s->s_delegated_inos);
2f2dc053 671 kfree(s);
4e7a5dcd 672 }
2f2dc053
SW		 673}
674
675/*
676 * called under mdsc->mutex
677 */
678struct ceph_mds_session *__ceph_lookup_mds_session(struct ceph_mds_client *mdsc,
679 int mds)
680{
d37b1d99 681 if (mds >= mdsc->max_sessions || !mdsc->sessions[mds])
2f2dc053 682 return NULL;
5b3248c6 683 return ceph_get_mds_session(mdsc->sessions[mds]);
2f2dc053
SW		 684}
685
686static bool __have_session(struct ceph_mds_client *mdsc, int mds)
687{
98cfda81 688 if (mds >= mdsc->max_sessions || !mdsc->sessions[mds])
2f2dc053 689 return false;
98cfda81
CX		 690 else
691 return true;
2f2dc053
SW		 692}
693
2600d2dd
SW		 694static int __verify_registered_session(struct ceph_mds_client *mdsc,
695 struct ceph_mds_session *s)
696{
697 if (s->s_mds >= mdsc->max_sessions ||
698 mdsc->sessions[s->s_mds] != s)
699 return -ENOENT;
700 return 0;
701}
702
2f2dc053
SW		 703/*
704 * create+register a new session for given mds.
705 * called under mdsc->mutex.
706 */
707static struct ceph_mds_session *register_session(struct ceph_mds_client *mdsc,
708 int mds)
709{
710 struct ceph_mds_session *s;
711
b38c9eb4 712 if (mds >= mdsc->mdsmap->possible_max_rank)
c338c07c
NY		 713 return ERR_PTR(-EINVAL);
714
2f2dc053 715 s = kzalloc(sizeof(*s), GFP_NOFS);
4736b009
DC		 716 if (!s)
717 return ERR_PTR(-ENOMEM);
47474d0b
CX		 718
719 if (mds >= mdsc->max_sessions) {
720 int newmax = 1 << get_count_order(mds + 1);
721 struct ceph_mds_session **sa;
722
723 dout("%s: realloc to %d\n", __func__, newmax);
724 sa = kcalloc(newmax, sizeof(void *), GFP_NOFS);
725 if (!sa)
726 goto fail_realloc;
727 if (mdsc->sessions) {
728 memcpy(sa, mdsc->sessions,
729 mdsc->max_sessions * sizeof(void *));
730 kfree(mdsc->sessions);
731 }
732 mdsc->sessions = sa;
733 mdsc->max_sessions = newmax;
734 }
735
736 dout("%s: mds%d\n", __func__, mds);
2f2dc053
SW		 737 s->s_mdsc = mdsc;
738 s->s_mds = mds;
739 s->s_state = CEPH_MDS_SESSION_NEW;
2f2dc053
SW		 740 mutex_init(&s->s_mutex);
741
b7a9e5dd 742 ceph_con_init(&s->s_con, s, &mds_con_ops, &mdsc->fsc->client->msgr);
2f2dc053 743
52d60f8e 744 atomic_set(&s->s_cap_gen, 1);
1ce208a6 745 s->s_cap_ttl = jiffies - 1;
d8fb02ab
AE		 746
747 spin_lock_init(&s->s_cap_lock);
2f2dc053 748 INIT_LIST_HEAD(&s->s_caps);
3997c01d 749 refcount_set(&s->s_ref, 1);
2f2dc053
SW		 750 INIT_LIST_HEAD(&s->s_waiting);
751 INIT_LIST_HEAD(&s->s_unsafe);
d4846487 752 xa_init(&s->s_delegated_inos);
2f2dc053 753 INIT_LIST_HEAD(&s->s_cap_releases);
e3ec8d68
YZ		 754 INIT_WORK(&s->s_cap_release_work, ceph_cap_release_work);
755
1cf03a68 756 INIT_LIST_HEAD(&s->s_cap_dirty);
2f2dc053 757 INIT_LIST_HEAD(&s->s_cap_flushing);
2f2dc053 758
2f2dc053 759 mdsc->sessions[mds] = s;
86d8f67b 760 atomic_inc(&mdsc->num_sessions);
3997c01d 761 refcount_inc(&s->s_ref); /* one ref to sessions[], one to caller */
42ce56e5 762
b7a9e5dd
SW		 763 ceph_con_open(&s->s_con, CEPH_ENTITY_TYPE_MDS, mds,
764 ceph_mdsmap_get_addr(mdsc->mdsmap, mds));
42ce56e5 765
2f2dc053 766 return s;
42ce56e5
SW		 767
768fail_realloc:
769 kfree(s);
770 return ERR_PTR(-ENOMEM);
2f2dc053
SW		 771}
772
773/*
774 * called under mdsc->mutex
775 */
2600d2dd 776static void __unregister_session(struct ceph_mds_client *mdsc,
42ce56e5 777 struct ceph_mds_session *s)
2f2dc053 778{
2600d2dd
SW		 779 dout("__unregister_session mds%d %p\n", s->s_mds, s);
780 BUG_ON(mdsc->sessions[s->s_mds] != s);
42ce56e5
SW		 781 mdsc->sessions[s->s_mds] = NULL;
782 ceph_con_close(&s->s_con);
783 ceph_put_mds_session(s);
86d8f67b 784 atomic_dec(&mdsc->num_sessions);
2f2dc053
SW		 785}
786
787/*
788 * drop session refs in request.
789 *
790 * should be last request ref, or hold mdsc->mutex
791 */
792static void put_request_session(struct ceph_mds_request *req)
793{
794 if (req->r_session) {
795 ceph_put_mds_session(req->r_session);
796 req->r_session = NULL;
797 }
798}
799
59b312f3
XL		 800void ceph_mdsc_iterate_sessions(struct ceph_mds_client *mdsc,
801 void (*cb)(struct ceph_mds_session *),
802 bool check_state)
803{
804 int mds;
805
806 mutex_lock(&mdsc->mutex);
807 for (mds = 0; mds < mdsc->max_sessions; ++mds) {
808 struct ceph_mds_session *s;
809
810 s = __ceph_lookup_mds_session(mdsc, mds);
811 if (!s)
812 continue;
813
814 if (check_state && !check_session_state(s)) {
815 ceph_put_mds_session(s);
816 continue;
817 }
818
819 mutex_unlock(&mdsc->mutex);
820 cb(s);
821 ceph_put_mds_session(s);
822 mutex_lock(&mdsc->mutex);
823 }
824 mutex_unlock(&mdsc->mutex);
825}
826
153c8e6b 827void ceph_mdsc_release_request(struct kref *kref)
2f2dc053 828{
153c8e6b
SW		 829 struct ceph_mds_request *req = container_of(kref,
830 struct ceph_mds_request,
831 r_kref);
e64f44a8 832 ceph_mdsc_release_dir_caps_no_check(req);
54008399 833 destroy_reply_info(&req->r_reply_info);
153c8e6b
SW		 834 if (req->r_request)
835 ceph_msg_put(req->r_request);
54008399 836 if (req->r_reply)
153c8e6b 837 ceph_msg_put(req->r_reply);
153c8e6b 838 if (req->r_inode) {
41b02e1f 839 ceph_put_cap_refs(ceph_inode(req->r_inode), CEPH_CAP_PIN);
23c2c76e 840 iput(req->r_inode);
153c8e6b 841 }
9c1c2b35 842 if (req->r_parent) {
3dd69aab 843 ceph_put_cap_refs(ceph_inode(req->r_parent), CEPH_CAP_PIN);
23c2c76e 844 iput(req->r_parent);
9c1c2b35 845 }
23c2c76e 846 iput(req->r_target_inode);
153c8e6b
SW		 847 if (req->r_dentry)
848 dput(req->r_dentry);
844d87c3
SW		 849 if (req->r_old_dentry)
850 dput(req->r_old_dentry);
851 if (req->r_old_dentry_dir) {
41b02e1f
SW		 852 /*
853 * track (and drop pins for) r_old_dentry_dir
854 * separately, since r_old_dentry's d_parent may have
855 * changed between the dir mutex being dropped and
856 * this request being freed.
857 */
858 ceph_put_cap_refs(ceph_inode(req->r_old_dentry_dir),
859 CEPH_CAP_PIN);
23c2c76e 860 iput(req->r_old_dentry_dir);
2f2dc053 861 }
153c8e6b
SW		 862 kfree(req->r_path1);
863 kfree(req->r_path2);
7fe0cdeb 864 put_cred(req->r_cred);
25e6bae3
YZ		 865 if (req->r_pagelist)
866 ceph_pagelist_release(req->r_pagelist);
153c8e6b 867 put_request_session(req);
37151668 868 ceph_unreserve_caps(req->r_mdsc, &req->r_caps_reservation);
428138c9 869 WARN_ON_ONCE(!list_empty(&req->r_wait));
058daab7 870 kmem_cache_free(ceph_mds_request_cachep, req);
2f2dc053
SW		 871}
872
fcd00b68
ID		 873DEFINE_RB_FUNCS(request, struct ceph_mds_request, r_tid, r_node)
874
2f2dc053
SW		 875/*
876 * lookup session, bump ref if found.
877 *
878 * called under mdsc->mutex.
879 */
fcd00b68
ID		 880static struct ceph_mds_request *
881lookup_get_request(struct ceph_mds_client *mdsc, u64 tid)
2f2dc053
SW		 882{
883 struct ceph_mds_request *req;
44ca18f2 884
fcd00b68
ID		 885 req = lookup_request(&mdsc->request_tree, tid);
886 if (req)
887 ceph_mdsc_get_request(req);
44ca18f2 888
fcd00b68 889 return req;
2f2dc053
SW		 890}
891
892/*
893 * Register an in-flight request, and assign a tid. Link to directory
894 * are modifying (if any).
895 *
896 * Called under mdsc->mutex.
897 */
898static void __register_request(struct ceph_mds_client *mdsc,
899 struct ceph_mds_request *req,
900 struct inode *dir)
901{
e30ee581
ZZ		 902 int ret = 0;
903
2f2dc053 904 req->r_tid = ++mdsc->last_tid;
e30ee581
ZZ		 905 if (req->r_num_caps) {
906 ret = ceph_reserve_caps(mdsc, &req->r_caps_reservation,
907 req->r_num_caps);
908 if (ret < 0) {
909 pr_err("__register_request %p "
910 "failed to reserve caps: %d\n", req, ret);
911 /* set req->r_err to fail early from __do_request */
912 req->r_err = ret;
913 return;
914 }
915 }
2f2dc053
SW		 916 dout("__register_request %p tid %lld\n", req, req->r_tid);
917 ceph_mdsc_get_request(req);
fcd00b68 918 insert_request(&mdsc->request_tree, req);
2f2dc053 919
7fe0cdeb 920 req->r_cred = get_current_cred();
cb4276cc 921
e8a7b8b1
YZ		 922 if (mdsc->oldest_tid == 0 && req->r_op != CEPH_MDS_OP_SETFILELOCK)
923 mdsc->oldest_tid = req->r_tid;
924
2f2dc053 925 if (dir) {
3db0a2fc
JL		 926 struct ceph_inode_info *ci = ceph_inode(dir);
927
3b663780 928 ihold(dir);
2f2dc053 929 req->r_unsafe_dir = dir;
3db0a2fc
JL		 930 spin_lock(&ci->i_unsafe_lock);
931 list_add_tail(&req->r_unsafe_dir_item, &ci->i_unsafe_dirops);
932 spin_unlock(&ci->i_unsafe_lock);
2f2dc053
SW		 933 }
934}
935
936static void __unregister_request(struct ceph_mds_client *mdsc,
937 struct ceph_mds_request *req)
938{
939 dout("__unregister_request %p tid %lld\n", req, req->r_tid);
e8a7b8b1 940
df963ea8
JL		 941 /* Never leave an unregistered request on an unsafe list! */
942 list_del_init(&req->r_unsafe_item);
943
e8a7b8b1
YZ		 944 if (req->r_tid == mdsc->oldest_tid) {
945 struct rb_node *p = rb_next(&req->r_node);
946 mdsc->oldest_tid = 0;
947 while (p) {
948 struct ceph_mds_request *next_req =
949 rb_entry(p, struct ceph_mds_request, r_node);
950 if (next_req->r_op != CEPH_MDS_OP_SETFILELOCK) {
951 mdsc->oldest_tid = next_req->r_tid;
952 break;
953 }
954 p = rb_next(p);
955 }
956 }
957
fcd00b68 958 erase_request(&mdsc->request_tree, req);
2f2dc053 959
3db0a2fc 960 if (req->r_unsafe_dir) {
2f2dc053 961 struct ceph_inode_info *ci = ceph_inode(req->r_unsafe_dir);
2f2dc053
SW		 962 spin_lock(&ci->i_unsafe_lock);
963 list_del_init(&req->r_unsafe_dir_item);
964 spin_unlock(&ci->i_unsafe_lock);
4c06ace8 965 }
bc2de10d
JL		 966 if (req->r_target_inode &&
967 test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) {
68cd5b4b
YZ		 968 struct ceph_inode_info *ci = ceph_inode(req->r_target_inode);
969 spin_lock(&ci->i_unsafe_lock);
970 list_del_init(&req->r_unsafe_target_item);
971 spin_unlock(&ci->i_unsafe_lock);
972 }
3b663780 973
4c06ace8 974 if (req->r_unsafe_dir) {
23c2c76e 975 iput(req->r_unsafe_dir);
3b663780 976 req->r_unsafe_dir = NULL;
2f2dc053 977 }
94aa8ae1 978
fc55d2c9
YZ		 979 complete_all(&req->r_safe_completion);
980
94aa8ae1 981 ceph_mdsc_put_request(req);
2f2dc053
SW		 982}
983
30c71233
JL		 984/*
985 * Walk back up the dentry tree until we hit a dentry representing a
986 * non-snapshot inode. We do this using the rcu_read_lock (which must be held
987 * when calling this) to ensure that the objects won't disappear while we're
988 * working with them. Once we hit a candidate dentry, we attempt to take a
989 * reference to it, and return that as the result.
990 */
f1075480
DC		 991static struct inode *get_nonsnap_parent(struct dentry *dentry)
992{
993 struct inode *inode = NULL;
30c71233
JL		 994
995 while (dentry && !IS_ROOT(dentry)) {
996 inode = d_inode_rcu(dentry);
997 if (!inode || ceph_snap(inode) == CEPH_NOSNAP)
998 break;
999 dentry = dentry->d_parent;
1000 }
1001 if (inode)
1002 inode = igrab(inode);
1003 return inode;
1004}
1005
2f2dc053
SW		 1006/*
1007 * Choose mds to send request to next. If there is a hint set in the
1008 * request (e.g., due to a prior forward hint from the mds), use that.
1009 * Otherwise, consult frag tree and/or caps to identify the
1010 * appropriate mds. If all else fails, choose randomly.
1011 *
1012 * Called under mdsc->mutex.
1013 */
1014static int __choose_mds(struct ceph_mds_client *mdsc,
c4853e97
XL		 1015 struct ceph_mds_request *req,
1016 bool *random)
2f2dc053
SW		 1017{
1018 struct inode *inode;
1019 struct ceph_inode_info *ci;
1020 struct ceph_cap *cap;
1021 int mode = req->r_direct_mode;
1022 int mds = -1;
1023 u32 hash = req->r_direct_hash;
bc2de10d 1024 bool is_hash = test_bit(CEPH_MDS_R_DIRECT_IS_HASH, &req->r_req_flags);
2f2dc053 1025
c4853e97
XL		 1026 if (random)
1027 *random = false;
1028
2f2dc053
SW		 1029 /*
1030 * is there a specific mds we should try? ignore hint if we have
1031 * no session and the mds is not up (active or recovering).
1032 */
1033 if (req->r_resend_mds >= 0 &&
1034 (__have_session(mdsc, req->r_resend_mds) ||
1035 ceph_mdsmap_get_state(mdsc->mdsmap, req->r_resend_mds) > 0)) {
3c802092 1036 dout("%s using resend_mds mds%d\n", __func__,
2f2dc053
SW		 1037 req->r_resend_mds);
1038 return req->r_resend_mds;
1039 }
1040
1041 if (mode == USE_RANDOM_MDS)
1042 goto random;
1043
1044 inode = NULL;
1045 if (req->r_inode) {
5d37ca14
YZ		 1046 if (ceph_snap(req->r_inode) != CEPH_SNAPDIR) {
1047 inode = req->r_inode;
1048 ihold(inode);
1049 } else {
38f340cc
YZ		 1050 /* req->r_dentry is non-null for LSSNAP request */
1051 rcu_read_lock();
1052 inode = get_nonsnap_parent(req->r_dentry);
1053 rcu_read_unlock();
3c802092 1054 dout("%s using snapdir's parent %p\n", __func__, inode);
5d37ca14 1055 }
38f340cc 1056 } else if (req->r_dentry) {
d79698da 1057 /* ignore race with rename; old or new d_parent is okay */
30c71233
JL		 1058 struct dentry *parent;
1059 struct inode *dir;
1060
1061 rcu_read_lock();
41883ba8 1062 parent = READ_ONCE(req->r_dentry->d_parent);
3dd69aab 1063 dir = req->r_parent ? : d_inode_rcu(parent);
eb6bb1c5 1064
30c71233
JL		 1065 if (!dir || dir->i_sb != mdsc->fsc->sb) {
1066 /* not this fs or parent went negative */
2b0143b5 1067 inode = d_inode(req->r_dentry);
30c71233
JL		 1068 if (inode)
1069 ihold(inode);
eb6bb1c5
SW		 1070 } else if (ceph_snap(dir) != CEPH_NOSNAP) {
1071 /* direct snapped/virtual snapdir requests
1072 * based on parent dir inode */
30c71233 1073 inode = get_nonsnap_parent(parent);
3c802092 1074 dout("%s using nonsnap parent %p\n", __func__, inode);
ca18bede 1075 } else {
eb6bb1c5 1076 /* dentry target */
2b0143b5 1077 inode = d_inode(req->r_dentry);
ca18bede
YZ		 1078 if (!inode || mode == USE_AUTH_MDS) {
1079 /* dir + name */
30c71233 1080 inode = igrab(dir);
ca18bede
YZ		 1081 hash = ceph_dentry_hash(dir, req->r_dentry);
1082 is_hash = true;
30c71233
JL		 1083 } else {
1084 ihold(inode);
ca18bede 1085 }
2f2dc053 1086 }
30c71233 1087 rcu_read_unlock();
2f2dc053 1088 }
eb6bb1c5 1089
3c802092
XL		 1090 dout("%s %p is_hash=%d (0x%x) mode %d\n", __func__, inode, (int)is_hash,
1091 hash, mode);
2f2dc053
SW		 1092 if (!inode)
1093 goto random;
1094 ci = ceph_inode(inode);
1095
1096 if (is_hash && S_ISDIR(inode->i_mode)) {
1097 struct ceph_inode_frag frag;
1098 int found;
1099
1100 ceph_choose_frag(ci, hash, &frag, &found);
1101 if (found) {
1102 if (mode == USE_ANY_MDS && frag.ndist > 0) {
1103 u8 r;
1104
1105 /* choose a random replica */
1106 get_random_bytes(&r, 1);
1107 r %= frag.ndist;
1108 mds = frag.dist[r];
3c802092
XL		 1109 dout("%s %p %llx.%llx frag %u mds%d (%d/%d)\n",
1110 __func__, inode, ceph_vinop(inode),
1111 frag.frag, mds, (int)r, frag.ndist);
d66bbd44 1112 if (ceph_mdsmap_get_state(mdsc->mdsmap, mds) >=
5d47648f
XL		 1113 CEPH_MDS_STATE_ACTIVE &&
1114 !ceph_mdsmap_is_laggy(mdsc->mdsmap, mds))
30c71233 1115 goto out;
2f2dc053
SW		 1116 }
1117
1118 /* since this file/dir wasn't known to be
1119 * replicated, then we want to look for the
1120 * authoritative mds. */
2f2dc053
SW		 1121 if (frag.mds >= 0) {
1122 /* choose auth mds */
1123 mds = frag.mds;
3c802092
XL		 1124 dout("%s %p %llx.%llx frag %u mds%d (auth)\n",
1125 __func__, inode, ceph_vinop(inode),
1126 frag.frag, mds);
d66bbd44 1127 if (ceph_mdsmap_get_state(mdsc->mdsmap, mds) >=
5d47648f 1128 CEPH_MDS_STATE_ACTIVE) {
224c7b67 1129 if (!ceph_mdsmap_is_laggy(mdsc->mdsmap,
5d47648f
XL		 1130 mds))
1131 goto out;
1132 }
2f2dc053 1133 }
5d47648f 1134 mode = USE_AUTH_MDS;
2f2dc053
SW		 1135 }
1136 }
1137
be655596 1138 spin_lock(&ci->i_ceph_lock);
2f2dc053
SW		 1139 cap = NULL;
1140 if (mode == USE_AUTH_MDS)
1141 cap = ci->i_auth_cap;
1142 if (!cap && !RB_EMPTY_ROOT(&ci->i_caps))
1143 cap = rb_entry(rb_first(&ci->i_caps), struct ceph_cap, ci_node);
1144 if (!cap) {
be655596 1145 spin_unlock(&ci->i_ceph_lock);
23c2c76e 1146 iput(inode);
2f2dc053
SW		 1147 goto random;
1148 }
1149 mds = cap->session->s_mds;
3c802092 1150 dout("%s %p %llx.%llx mds%d (%scap %p)\n", __func__,
2f2dc053
SW		 1151 inode, ceph_vinop(inode), mds,
1152 cap == ci->i_auth_cap ? "auth " : "", cap);
be655596 1153 spin_unlock(&ci->i_ceph_lock);
30c71233 1154out:
23c2c76e 1155 iput(inode);
2f2dc053
SW		 1156 return mds;
1157
1158random:
c4853e97
XL		 1159 if (random)
1160 *random = true;
1161
2f2dc053 1162 mds = ceph_mdsmap_get_random_mds(mdsc->mdsmap);
3c802092 1163 dout("%s chose random mds%d\n", __func__, mds);
2f2dc053
SW		 1164 return mds;
1165}
1166
1167
1168/*
1169 * session messages
1170 */
fba97e80 1171struct ceph_msg *ceph_create_session_msg(u32 op, u64 seq)
2f2dc053
SW		 1172{
1173 struct ceph_msg *msg;
1174 struct ceph_mds_session_head *h;
1175
b61c2763
SW		 1176 msg = ceph_msg_new(CEPH_MSG_CLIENT_SESSION, sizeof(*h), GFP_NOFS,
1177 false);
a79832f2 1178 if (!msg) {
fba97e80
XL		 1179 pr_err("ENOMEM creating session %s msg\n",
1180 ceph_session_op_name(op));
a79832f2 1181 return NULL;
2f2dc053
SW		 1182 }
1183 h = msg->front.iov_base;
1184 h->op = cpu_to_le32(op);
1185 h->seq = cpu_to_le64(seq);
dbd0c8bf
JS		 1186
1187 return msg;
1188}
1189
9ba1e224
XL		 1190static const unsigned char feature_bits[] = CEPHFS_FEATURES_CLIENT_SUPPORTED;
1191#define FEATURE_BYTES(c) (DIV_ROUND_UP((size_t)feature_bits[c - 1] + 1, 64) * 8)
b682c6d4 1192static int encode_supported_features(void **p, void *end)
342ce182 1193{
9ba1e224 1194 static const size_t count = ARRAY_SIZE(feature_bits);
342ce182
YZ		 1195
1196 if (count > 0) {
1197 size_t i;
9ba1e224 1198 size_t size = FEATURE_BYTES(count);
342ce182 1199
b682c6d4
XL		 1200 if (WARN_ON_ONCE(*p + 4 + size > end))
1201 return -ERANGE;
1202
342ce182
YZ		 1203 ceph_encode_32(p, size);
1204 memset(*p, 0, size);
1205 for (i = 0; i < count; i++)
9ba1e224 1206 ((unsigned char*)(*p))[i / 8] |= BIT(feature_bits[i] % 8);
342ce182
YZ		 1207 *p += size;
1208 } else {
b682c6d4
XL		 1209 if (WARN_ON_ONCE(*p + 4 > end))
1210 return -ERANGE;
1211
342ce182
YZ		 1212 ceph_encode_32(p, 0);
1213 }
b682c6d4
XL		 1214
1215 return 0;
342ce182
YZ		 1216}
1217
3b4168dd
XL		 1218static const unsigned char metric_bits[] = CEPHFS_METRIC_SPEC_CLIENT_SUPPORTED;
1219#define METRIC_BYTES(cnt) (DIV_ROUND_UP((size_t)metric_bits[cnt - 1] + 1, 64) * 8)
1220static int encode_metric_spec(void **p, void *end)
1221{
1222 static const size_t count = ARRAY_SIZE(metric_bits);
1223
1224 /* header */
1225 if (WARN_ON_ONCE(*p + 2 > end))
1226 return -ERANGE;
1227
1228 ceph_encode_8(p, 1); /* version */
1229 ceph_encode_8(p, 1); /* compat */
1230
1231 if (count > 0) {
1232 size_t i;
1233 size_t size = METRIC_BYTES(count);
1234
1235 if (WARN_ON_ONCE(*p + 4 + 4 + size > end))
1236 return -ERANGE;
1237
1238 /* metric spec info length */
1239 ceph_encode_32(p, 4 + size);
1240
1241 /* metric spec */
1242 ceph_encode_32(p, size);
1243 memset(*p, 0, size);
1244 for (i = 0; i < count; i++)
1245 ((unsigned char *)(*p))[i / 8] |= BIT(metric_bits[i] % 8);
1246 *p += size;
1247 } else {
1248 if (WARN_ON_ONCE(*p + 4 + 4 > end))
1249 return -ERANGE;
1250
1251 /* metric spec info length */
1252 ceph_encode_32(p, 4);
1253 /* metric spec */
1254 ceph_encode_32(p, 0);
1255 }
1256
1257 return 0;
1258}
1259
dbd0c8bf
JS		 1260/*
1261 * session message, specialization for CEPH_SESSION_REQUEST_OPEN
1262 * to include additional client metadata fields.
1263 */
1264static struct ceph_msg *create_session_open_msg(struct ceph_mds_client *mdsc, u64 seq)
1265{
1266 struct ceph_msg *msg;
1267 struct ceph_mds_session_head *h;
4a756db2 1268 int i;
342ce182 1269 int extra_bytes = 0;
dbd0c8bf
JS		 1270 int metadata_key_count = 0;
1271 struct ceph_options *opt = mdsc->fsc->client->options;
3f384954 1272 struct ceph_mount_options *fsopt = mdsc->fsc->mount_options;
9ba1e224 1273 size_t size, count;
342ce182 1274 void *p, *end;
b682c6d4 1275 int ret;
dbd0c8bf 1276
a6a5ce4f 1277 const char* metadata[][2] = {
717e6f28
YZ		 1278 {"hostname", mdsc->nodename},
1279 {"kernel_version", init_utsname()->release},
3f384954
YZ		 1280 {"entity_id", opt->name ? : ""},
1281 {"root", fsopt->server_path ? : "/"},
dbd0c8bf
JS		 1282 {NULL, NULL}
1283 };
1284
1285 /* Calculate serialized length of metadata */
342ce182 1286 extra_bytes = 4; /* map length */
d37b1d99 1287 for (i = 0; metadata[i][0]; ++i) {
342ce182 1288 extra_bytes += 8 + strlen(metadata[i][0]) +
dbd0c8bf
JS		 1289 strlen(metadata[i][1]);
1290 metadata_key_count++;
1291 }
9ba1e224 1292
342ce182 1293 /* supported feature */
9ba1e224
XL		 1294 size = 0;
1295 count = ARRAY_SIZE(feature_bits);
1296 if (count > 0)
1297 size = FEATURE_BYTES(count);
1298 extra_bytes += 4 + size;
dbd0c8bf 1299
3b4168dd
XL		 1300 /* metric spec */
1301 size = 0;
1302 count = ARRAY_SIZE(metric_bits);
1303 if (count > 0)
1304 size = METRIC_BYTES(count);
1305 extra_bytes += 2 + 4 + 4 + size;
1306
dbd0c8bf 1307 /* Allocate the message */
342ce182 1308 msg = ceph_msg_new(CEPH_MSG_CLIENT_SESSION, sizeof(*h) + extra_bytes,
dbd0c8bf
JS		 1309 GFP_NOFS, false);
1310 if (!msg) {
fba97e80 1311 pr_err("ENOMEM creating session open msg\n");
b682c6d4 1312 return ERR_PTR(-ENOMEM);
dbd0c8bf 1313 }
342ce182
YZ		 1314 p = msg->front.iov_base;
1315 end = p + msg->front.iov_len;
1316
1317 h = p;
dbd0c8bf
JS		 1318 h->op = cpu_to_le32(CEPH_SESSION_REQUEST_OPEN);
1319 h->seq = cpu_to_le64(seq);
1320
1321 /*
1322 * Serialize client metadata into waiting buffer space, using
1323 * the format that userspace expects for map<string, string>
7cfa0313 1324 *
3b4168dd 1325 * ClientSession messages with metadata are v4
dbd0c8bf 1326 */
3b4168dd 1327 msg->hdr.version = cpu_to_le16(4);
7cfa0313 1328 msg->hdr.compat_version = cpu_to_le16(1);
dbd0c8bf
JS		 1329
1330 /* The write pointer, following the session_head structure */
342ce182 1331 p += sizeof(*h);
dbd0c8bf
JS		 1332
1333 /* Number of entries in the map */
1334 ceph_encode_32(&p, metadata_key_count);
1335
1336 /* Two length-prefixed strings for each entry in the map */
d37b1d99 1337 for (i = 0; metadata[i][0]; ++i) {
dbd0c8bf
JS		 1338 size_t const key_len = strlen(metadata[i][0]);
1339 size_t const val_len = strlen(metadata[i][1]);
1340
1341 ceph_encode_32(&p, key_len);
1342 memcpy(p, metadata[i][0], key_len);
1343 p += key_len;
1344 ceph_encode_32(&p, val_len);
1345 memcpy(p, metadata[i][1], val_len);
1346 p += val_len;
1347 }
1348
b682c6d4
XL		 1349 ret = encode_supported_features(&p, end);
1350 if (ret) {
1351 pr_err("encode_supported_features failed!\n");
1352 ceph_msg_put(msg);
1353 return ERR_PTR(ret);
1354 }
1355
3b4168dd
XL		 1356 ret = encode_metric_spec(&p, end);
1357 if (ret) {
1358 pr_err("encode_metric_spec failed!\n");
1359 ceph_msg_put(msg);
1360 return ERR_PTR(ret);
1361 }
1362
342ce182
YZ		 1363 msg->front.iov_len = p - msg->front.iov_base;
1364 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
1365
2f2dc053
SW		 1366 return msg;
1367}
1368
1369/*
1370 * send session open request.
1371 *
1372 * called under mdsc->mutex
1373 */
1374static int __open_session(struct ceph_mds_client *mdsc,
1375 struct ceph_mds_session *session)
1376{
1377 struct ceph_msg *msg;
1378 int mstate;
1379 int mds = session->s_mds;
2f2dc053
SW		 1380
1381 /* wait for mds to go active? */
1382 mstate = ceph_mdsmap_get_state(mdsc->mdsmap, mds);
1383 dout("open_session to mds%d (%s)\n", mds,
1384 ceph_mds_state_name(mstate));
1385 session->s_state = CEPH_MDS_SESSION_OPENING;
1386 session->s_renew_requested = jiffies;
1387
1388 /* send connect message */
dbd0c8bf 1389 msg = create_session_open_msg(mdsc, session->s_seq);
b682c6d4
XL		 1390 if (IS_ERR(msg))
1391 return PTR_ERR(msg);
2f2dc053 1392 ceph_con_send(&session->s_con, msg);
2f2dc053
SW		 1393 return 0;
1394}
1395
ed0552a1
SW		 1396/*
1397 * open sessions for any export targets for the given mds
1398 *
1399 * called under mdsc->mutex
1400 */
5d72d13c
YZ		 1401static struct ceph_mds_session *
1402__open_export_target_session(struct ceph_mds_client *mdsc, int target)
1403{
1404 struct ceph_mds_session *session;
b682c6d4 1405 int ret;
5d72d13c
YZ		 1406
1407 session = __ceph_lookup_mds_session(mdsc, target);
1408 if (!session) {
1409 session = register_session(mdsc, target);
1410 if (IS_ERR(session))
1411 return session;
1412 }
1413 if (session->s_state == CEPH_MDS_SESSION_NEW ||
b682c6d4
XL		 1414 session->s_state == CEPH_MDS_SESSION_CLOSING) {
1415 ret = __open_session(mdsc, session);
1416 if (ret)
1417 return ERR_PTR(ret);
1418 }
5d72d13c
YZ		 1419
1420 return session;
1421}
1422
1423struct ceph_mds_session *
1424ceph_mdsc_open_export_target_session(struct ceph_mds_client *mdsc, int target)
1425{
1426 struct ceph_mds_session *session;
1427
1428 dout("open_export_target_session to mds%d\n", target);
1429
1430 mutex_lock(&mdsc->mutex);
1431 session = __open_export_target_session(mdsc, target);
1432 mutex_unlock(&mdsc->mutex);
1433
1434 return session;
1435}
1436
ed0552a1
SW		 1437static void __open_export_target_sessions(struct ceph_mds_client *mdsc,
1438 struct ceph_mds_session *session)
1439{
1440 struct ceph_mds_info *mi;
1441 struct ceph_mds_session *ts;
1442 int i, mds = session->s_mds;
ed0552a1 1443
b38c9eb4 1444 if (mds >= mdsc->mdsmap->possible_max_rank)
ed0552a1 1445 return;
5d72d13c 1446
ed0552a1
SW		 1447 mi = &mdsc->mdsmap->m_info[mds];
1448 dout("open_export_target_sessions for mds%d (%d targets)\n",
1449 session->s_mds, mi->num_export_targets);
1450
1451 for (i = 0; i < mi->num_export_targets; i++) {
5d72d13c 1452 ts = __open_export_target_session(mdsc, mi->export_targets[i]);
7e65624d 1453 ceph_put_mds_session(ts);
ed0552a1
SW		 1454 }
1455}
1456
154f42c2
SW		 1457void ceph_mdsc_open_export_target_sessions(struct ceph_mds_client *mdsc,
1458 struct ceph_mds_session *session)
1459{
1460 mutex_lock(&mdsc->mutex);
1461 __open_export_target_sessions(mdsc, session);
1462 mutex_unlock(&mdsc->mutex);
1463}
1464
2f2dc053
SW		 1465/*
1466 * session caps
1467 */
1468
c8a96a31
JL		 1469static void detach_cap_releases(struct ceph_mds_session *session,
1470 struct list_head *target)
2f2dc053 1471{
c8a96a31
JL		 1472 lockdep_assert_held(&session->s_cap_lock);
1473
1474 list_splice_init(&session->s_cap_releases, target);
745a8e3b 1475 session->s_num_cap_releases = 0;
c8a96a31
JL		 1476 dout("dispose_cap_releases mds%d\n", session->s_mds);
1477}
2f2dc053 1478
c8a96a31
JL		 1479static void dispose_cap_releases(struct ceph_mds_client *mdsc,
1480 struct list_head *dispose)
1481{
1482 while (!list_empty(dispose)) {
745a8e3b
YZ		 1483 struct ceph_cap *cap;
1484 /* zero out the in-progress message */
c8a96a31 1485 cap = list_first_entry(dispose, struct ceph_cap, session_caps);
745a8e3b
YZ		 1486 list_del(&cap->session_caps);
1487 ceph_put_cap(mdsc, cap);
2f2dc053 1488 }
2f2dc053
SW		 1489}
1490
1c841a96
YZ		 1491static void cleanup_session_requests(struct ceph_mds_client *mdsc,
1492 struct ceph_mds_session *session)
1493{
1494 struct ceph_mds_request *req;
1495 struct rb_node *p;
1496
1497 dout("cleanup_session_requests mds%d\n", session->s_mds);
1498 mutex_lock(&mdsc->mutex);
1499 while (!list_empty(&session->s_unsafe)) {
1500 req = list_first_entry(&session->s_unsafe,
1501 struct ceph_mds_request, r_unsafe_item);
3e0708b9
YZ		 1502 pr_warn_ratelimited(" dropping unsafe request %llu\n",
1503 req->r_tid);
1bd85aa6
JL		 1504 if (req->r_target_inode)
1505 mapping_set_error(req->r_target_inode->i_mapping, -EIO);
1506 if (req->r_unsafe_dir)
1507 mapping_set_error(req->r_unsafe_dir->i_mapping, -EIO);
1c841a96
YZ		 1508 __unregister_request(mdsc, req);
1509 }
1510 /* zero r_attempts, so kick_requests() will re-send requests */
1511 p = rb_first(&mdsc->request_tree);
1512 while (p) {
1513 req = rb_entry(p, struct ceph_mds_request, r_node);
1514 p = rb_next(p);
1515 if (req->r_session &&
1516 req->r_session->s_mds == session->s_mds)
1517 req->r_attempts = 0;
1518 }
1519 mutex_unlock(&mdsc->mutex);
1520}
1521
2f2dc053 1522/*
f818a736
SW		 1523 * Helper to safely iterate over all caps associated with a session, with
1524 * special care taken to handle a racing __ceph_remove_cap().
2f2dc053 1525 *
f818a736 1526 * Caller must hold session s_mutex.
2f2dc053 1527 */
f5d77269
JL		 1528int ceph_iterate_session_caps(struct ceph_mds_session *session,
1529 int (*cb)(struct inode *, struct ceph_cap *,
1530 void *), void *arg)
2f2dc053 1531{
7c1332b8
SW		 1532 struct list_head *p;
1533 struct ceph_cap *cap;
1534 struct inode *inode, *last_inode = NULL;
1535 struct ceph_cap *old_cap = NULL;
2f2dc053
SW		 1536 int ret;
1537
1538 dout("iterate_session_caps %p mds%d\n", session, session->s_mds);
1539 spin_lock(&session->s_cap_lock);
7c1332b8
SW		 1540 p = session->s_caps.next;
1541 while (p != &session->s_caps) {
1542 cap = list_entry(p, struct ceph_cap, session_caps);
2f2dc053 1543 inode = igrab(&cap->ci->vfs_inode);
7c1332b8
SW		 1544 if (!inode) {
1545 p = p->next;
2f2dc053 1546 continue;
7c1332b8
SW		 1547 }
1548 session->s_cap_iterator = cap;
2f2dc053 1549 spin_unlock(&session->s_cap_lock);
7c1332b8
SW		 1550
1551 if (last_inode) {
23c2c76e 1552 iput(last_inode);
7c1332b8
SW		 1553 last_inode = NULL;
1554 }
1555 if (old_cap) {
37151668 1556 ceph_put_cap(session->s_mdsc, old_cap);
7c1332b8
SW		 1557 old_cap = NULL;
1558 }
1559
2f2dc053 1560 ret = cb(inode, cap, arg);
7c1332b8
SW		 1561 last_inode = inode;
1562
2f2dc053 1563 spin_lock(&session->s_cap_lock);
7c1332b8 1564 p = p->next;
d37b1d99 1565 if (!cap->ci) {
7c1332b8
SW		 1566 dout("iterate_session_caps finishing cap %p removal\n",
1567 cap);
1568 BUG_ON(cap->session != session);
745a8e3b 1569 cap->session = NULL;
7c1332b8
SW		 1570 list_del_init(&cap->session_caps);
1571 session->s_nr_caps--;
4f1d756d 1572 atomic64_dec(&session->s_mdsc->metric.total_caps);
e3ec8d68
YZ		 1573 if (cap->queue_release)
1574 __ceph_queue_cap_release(session, cap);
1575 else
745a8e3b 1576 old_cap = cap; /* put_cap it w/o locks held */
7c1332b8 1577 }
5dacf091
SW		 1578 if (ret < 0)
1579 goto out;
2f2dc053 1580 }
5dacf091
SW		 1581 ret = 0;
1582out:
7c1332b8 1583 session->s_cap_iterator = NULL;
2f2dc053 1584 spin_unlock(&session->s_cap_lock);
7c1332b8 1585
23c2c76e 1586 iput(last_inode);
7c1332b8 1587 if (old_cap)
37151668 1588 ceph_put_cap(session->s_mdsc, old_cap);
7c1332b8 1589
5dacf091 1590 return ret;
2f2dc053
SW		 1591}
1592
a6d37ccd
XL		 1593static int remove_capsnaps(struct ceph_mds_client *mdsc, struct inode *inode)
1594{
1595 struct ceph_inode_info *ci = ceph_inode(inode);
1596 struct ceph_cap_snap *capsnap;
1597 int capsnap_release = 0;
1598
1599 lockdep_assert_held(&ci->i_ceph_lock);
1600
1601 dout("removing capsnaps, ci is %p, inode is %p\n", ci, inode);
1602
1603 while (!list_empty(&ci->i_cap_snaps)) {
1604 capsnap = list_first_entry(&ci->i_cap_snaps,
1605 struct ceph_cap_snap, ci_item);
1606 __ceph_remove_capsnap(inode, capsnap, NULL, NULL);
1607 ceph_put_snap_context(capsnap->context);
1608 ceph_put_cap_snap(capsnap);
1609 capsnap_release++;
1610 }
1611 wake_up_all(&ci->i_cap_wq);
1612 wake_up_all(&mdsc->cap_flushing_wq);
1613 return capsnap_release;
1614}
1615
2f2dc053 1616static int remove_session_caps_cb(struct inode *inode, struct ceph_cap *cap,
6c99f254 1617 void *arg)
2f2dc053 1618{
6c93df5d 1619 struct ceph_fs_client *fsc = (struct ceph_fs_client *)arg;
a6d37ccd 1620 struct ceph_mds_client *mdsc = fsc->mdsc;
2f2dc053 1621 struct ceph_inode_info *ci = ceph_inode(inode);
553adfd9 1622 LIST_HEAD(to_remove);
f4b97866 1623 bool dirty_dropped = false;
6c93df5d 1624 bool invalidate = false;
a6d37ccd 1625 int capsnap_release = 0;
6c99f254 1626
2f2dc053
SW		 1627 dout("removing cap %p, ci is %p, inode is %p\n",
1628 cap, ci, &ci->vfs_inode);
be655596 1629 spin_lock(&ci->i_ceph_lock);
a096b09a 1630 __ceph_remove_cap(cap, false);
571ade33 1631 if (!ci->i_auth_cap) {
553adfd9 1632 struct ceph_cap_flush *cf;
6c99f254 1633
50c9132d 1634 if (READ_ONCE(fsc->mount_state) >= CEPH_MOUNT_SHUTDOWN) {
d468e729
YZ		 1635 if (inode->i_data.nrpages > 0)
1636 invalidate = true;
1637 if (ci->i_wrbuffer_ref > 0)
1638 mapping_set_error(&inode->i_data, -EIO);
1639 }
6c93df5d 1640
e4500b5e
YZ		 1641 while (!list_empty(&ci->i_cap_flush_list)) {
1642 cf = list_first_entry(&ci->i_cap_flush_list,
1643 struct ceph_cap_flush, i_list);
8cdcc07d 1644 list_move(&cf->i_list, &to_remove);
553adfd9
YZ		 1645 }
1646
6c99f254 1647 spin_lock(&mdsc->cap_dirty_lock);
8310b089 1648
e4500b5e 1649 list_for_each_entry(cf, &to_remove, i_list)
b2f9fa1f 1650 list_del_init(&cf->g_list);
8310b089 1651
6c99f254 1652 if (!list_empty(&ci->i_dirty_item)) {
3e0708b9
YZ		 1653 pr_warn_ratelimited(
1654 " dropping dirty %s state for %p %lld\n",
6c99f254
SW		 1655 ceph_cap_string(ci->i_dirty_caps),
1656 inode, ceph_ino(inode));
1657 ci->i_dirty_caps = 0;
1658 list_del_init(&ci->i_dirty_item);
f4b97866 1659 dirty_dropped = true;
6c99f254
SW		 1660 }
1661 if (!list_empty(&ci->i_flushing_item)) {
3e0708b9
YZ		 1662 pr_warn_ratelimited(
1663 " dropping dirty+flushing %s state for %p %lld\n",
6c99f254
SW		 1664 ceph_cap_string(ci->i_flushing_caps),
1665 inode, ceph_ino(inode));
1666 ci->i_flushing_caps = 0;
1667 list_del_init(&ci->i_flushing_item);
1668 mdsc->num_cap_flushing--;
f4b97866 1669 dirty_dropped = true;
6c99f254 1670 }
6c99f254 1671 spin_unlock(&mdsc->cap_dirty_lock);
553adfd9 1672
f4b97866 1673 if (dirty_dropped) {
1bd85aa6 1674 mapping_set_error(inode->i_mapping, -EIO);
f4b97866
YZ		 1675
1676 if (ci->i_wrbuffer_ref_head == 0 &&
1677 ci->i_wr_ref == 0 &&
1678 ci->i_dirty_caps == 0 &&
1679 ci->i_flushing_caps == 0) {
1680 ceph_put_snap_context(ci->i_head_snapc);
1681 ci->i_head_snapc = NULL;
1682 }
1683 }
1684
b3f8d68f
YZ		 1685 if (atomic_read(&ci->i_filelock_ref) > 0) {
1686 /* make further file lock syscall return -EIO */
1687 ci->i_ceph_flags |= CEPH_I_ERROR_FILELOCK;
1688 pr_warn_ratelimited(" dropping file locks for %p %lld\n",
1689 inode, ceph_ino(inode));
1690 }
1691
f66fd9f0 1692 if (!ci->i_dirty_caps && ci->i_prealloc_cap_flush) {
e4500b5e 1693 list_add(&ci->i_prealloc_cap_flush->i_list, &to_remove);
f66fd9f0
YZ		 1694 ci->i_prealloc_cap_flush = NULL;
1695 }
a6d37ccd
XL		 1696
1697 if (!list_empty(&ci->i_cap_snaps))
1698 capsnap_release = remove_capsnaps(mdsc, inode);
6c99f254 1699 }
be655596 1700 spin_unlock(&ci->i_ceph_lock);
553adfd9
YZ		 1701 while (!list_empty(&to_remove)) {
1702 struct ceph_cap_flush *cf;
1703 cf = list_first_entry(&to_remove,
e4500b5e 1704 struct ceph_cap_flush, i_list);
b2f9fa1f
XL		 1705 list_del_init(&cf->i_list);
1706 if (!cf->is_capsnap)
1707 ceph_free_cap_flush(cf);
553adfd9 1708 }
77310320
YZ		 1709
1710 wake_up_all(&ci->i_cap_wq);
6c93df5d
YZ		 1711 if (invalidate)
1712 ceph_queue_invalidate(inode);
f4b97866 1713 if (dirty_dropped)
6c99f254 1714 iput(inode);
a6d37ccd
XL		 1715 while (capsnap_release--)
1716 iput(inode);
2f2dc053
SW		 1717 return 0;
1718}
1719
1720/*
1721 * caller must hold session s_mutex
1722 */
1723static void remove_session_caps(struct ceph_mds_session *session)
1724{
6c93df5d
YZ		 1725 struct ceph_fs_client *fsc = session->s_mdsc->fsc;
1726 struct super_block *sb = fsc->sb;
c8a96a31
JL		 1727 LIST_HEAD(dispose);
1728
2f2dc053 1729 dout("remove_session_caps on %p\n", session);
f5d77269 1730 ceph_iterate_session_caps(session, remove_session_caps_cb, fsc);
6f60f889 1731
c8799fc4
YZ		 1732 wake_up_all(&fsc->mdsc->cap_flushing_wq);
1733
6f60f889
YZ		 1734 spin_lock(&session->s_cap_lock);
1735 if (session->s_nr_caps > 0) {
6f60f889
YZ		 1736 struct inode *inode;
1737 struct ceph_cap *cap, *prev = NULL;
1738 struct ceph_vino vino;
1739 /*
1740 * iterate_session_caps() skips inodes that are being
1741 * deleted, we need to wait until deletions are complete.
1742 * __wait_on_freeing_inode() is designed for the job,
1743 * but it is not exported, so use lookup inode function
1744 * to access it.
1745 */
1746 while (!list_empty(&session->s_caps)) {
1747 cap = list_entry(session->s_caps.next,
1748 struct ceph_cap, session_caps);
1749 if (cap == prev)
1750 break;
1751 prev = cap;
1752 vino = cap->ci->i_vino;
1753 spin_unlock(&session->s_cap_lock);
1754
ed284c49 1755 inode = ceph_find_inode(sb, vino);
23c2c76e 1756 iput(inode);
6f60f889
YZ		 1757
1758 spin_lock(&session->s_cap_lock);
1759 }
1760 }
745a8e3b
YZ		 1761
1762 // drop cap expires and unlock s_cap_lock
c8a96a31 1763 detach_cap_releases(session, &dispose);
6f60f889 1764
2f2dc053 1765 BUG_ON(session->s_nr_caps > 0);
6c99f254 1766 BUG_ON(!list_empty(&session->s_cap_flushing));
c8a96a31
JL		 1767 spin_unlock(&session->s_cap_lock);
1768 dispose_cap_releases(session->s_mdsc, &dispose);
2f2dc053
SW		 1769}
1770
d2f8bb27
YZ		 1771enum {
1772 RECONNECT,
1773 RENEWCAPS,
1774 FORCE_RO,
1775};
1776
2f2dc053
SW		 1777/*
1778 * wake up any threads waiting on this session's caps. if the cap is
1779 * old (didn't get renewed on the client reconnect), remove it now.
1780 *
1781 * caller must hold s_mutex.
1782 */
1783static int wake_up_session_cb(struct inode *inode, struct ceph_cap *cap,
1784 void *arg)
1785{
0dc2570f 1786 struct ceph_inode_info *ci = ceph_inode(inode);
d2f8bb27 1787 unsigned long ev = (unsigned long)arg;
0dc2570f 1788
d2f8bb27 1789 if (ev == RECONNECT) {
be655596 1790 spin_lock(&ci->i_ceph_lock);
0dc2570f
SW		 1791 ci->i_wanted_max_size = 0;
1792 ci->i_requested_max_size = 0;
be655596 1793 spin_unlock(&ci->i_ceph_lock);
d2f8bb27 1794 } else if (ev == RENEWCAPS) {
52d60f8e 1795 if (cap->cap_gen < atomic_read(&cap->session->s_cap_gen)) {
d2f8bb27
YZ		 1796 /* mds did not re-issue stale cap */
1797 spin_lock(&ci->i_ceph_lock);
1798 cap->issued = cap->implemented = CEPH_CAP_PIN;
d2f8bb27
YZ		 1799 spin_unlock(&ci->i_ceph_lock);
1800 }
1801 } else if (ev == FORCE_RO) {
0dc2570f 1802 }
e5360309 1803 wake_up_all(&ci->i_cap_wq);
2f2dc053
SW		 1804 return 0;
1805}
1806
d2f8bb27 1807static void wake_up_session_caps(struct ceph_mds_session *session, int ev)
2f2dc053
SW		 1808{
1809 dout("wake_up_session_caps %p mds%d\n", session, session->s_mds);
f5d77269
JL		 1810 ceph_iterate_session_caps(session, wake_up_session_cb,
1811 (void *)(unsigned long)ev);
2f2dc053
SW		 1812}
1813
1814/*
1815 * Send periodic message to MDS renewing all currently held caps. The
1816 * ack will reset the expiration for all caps from this session.
1817 *
1818 * caller holds s_mutex
1819 */
1820static int send_renew_caps(struct ceph_mds_client *mdsc,
1821 struct ceph_mds_session *session)
1822{
1823 struct ceph_msg *msg;
1824 int state;
1825
1826 if (time_after_eq(jiffies, session->s_cap_ttl) &&
1827 time_after_eq(session->s_cap_ttl, session->s_renew_requested))
1828 pr_info("mds%d caps stale\n", session->s_mds);
e4cb4cb8 1829 session->s_renew_requested = jiffies;
2f2dc053
SW		 1830
1831 /* do not try to renew caps until a recovering mds has reconnected
1832 * with its clients. */
1833 state = ceph_mdsmap_get_state(mdsc->mdsmap, session->s_mds);
1834 if (state < CEPH_MDS_STATE_RECONNECT) {
1835 dout("send_renew_caps ignoring mds%d (%s)\n",
1836 session->s_mds, ceph_mds_state_name(state));
1837 return 0;
1838 }
1839
1840 dout("send_renew_caps to mds%d (%s)\n", session->s_mds,
1841 ceph_mds_state_name(state));
fba97e80
XL		 1842 msg = ceph_create_session_msg(CEPH_SESSION_REQUEST_RENEWCAPS,
1843 ++session->s_renew_seq);
a79832f2
SW		 1844 if (!msg)
1845 return -ENOMEM;
2f2dc053
SW		 1846 ceph_con_send(&session->s_con, msg);
1847 return 0;
1848}
1849
186e4f7a
YZ		 1850static int send_flushmsg_ack(struct ceph_mds_client *mdsc,
1851 struct ceph_mds_session *session, u64 seq)
1852{
1853 struct ceph_msg *msg;
1854
1855 dout("send_flushmsg_ack to mds%d (%s)s seq %lld\n",
a687ecaf 1856 session->s_mds, ceph_session_state_name(session->s_state), seq);
fba97e80 1857 msg = ceph_create_session_msg(CEPH_SESSION_FLUSHMSG_ACK, seq);
186e4f7a
YZ		 1858 if (!msg)
1859 return -ENOMEM;
1860 ceph_con_send(&session->s_con, msg);
1861 return 0;
1862}
1863
1864
2f2dc053
SW		 1865/*
1866 * Note new cap ttl, and any transition from stale -> not stale (fresh?).
0dc2570f
SW		 1867 *
1868 * Called under session->s_mutex
2f2dc053
SW		 1869 */
1870static void renewed_caps(struct ceph_mds_client *mdsc,
1871 struct ceph_mds_session *session, int is_renew)
1872{
1873 int was_stale;
1874 int wake = 0;
1875
1876 spin_lock(&session->s_cap_lock);
1ce208a6 1877 was_stale = is_renew && time_after_eq(jiffies, session->s_cap_ttl);
2f2dc053
SW		 1878
1879 session->s_cap_ttl = session->s_renew_requested +
1880 mdsc->mdsmap->m_session_timeout*HZ;
1881
1882 if (was_stale) {
1883 if (time_before(jiffies, session->s_cap_ttl)) {
1884 pr_info("mds%d caps renewed\n", session->s_mds);
1885 wake = 1;
1886 } else {
1887 pr_info("mds%d caps still stale\n", session->s_mds);
1888 }
1889 }
1890 dout("renewed_caps mds%d ttl now %lu, was %s, now %s\n",
1891 session->s_mds, session->s_cap_ttl, was_stale ? "stale" : "fresh",
1892 time_before(jiffies, session->s_cap_ttl) ? "stale" : "fresh");
1893 spin_unlock(&session->s_cap_lock);
1894
1895 if (wake)
d2f8bb27 1896 wake_up_session_caps(session, RENEWCAPS);
2f2dc053
SW		 1897}
1898
1899/*
1900 * send a session close request
1901 */
3e699bd8 1902static int request_close_session(struct ceph_mds_session *session)
2f2dc053
SW		 1903{
1904 struct ceph_msg *msg;
2f2dc053
SW		 1905
1906 dout("request_close_session mds%d state %s seq %lld\n",
a687ecaf 1907 session->s_mds, ceph_session_state_name(session->s_state),
2f2dc053 1908 session->s_seq);
fba97e80
XL		 1909 msg = ceph_create_session_msg(CEPH_SESSION_REQUEST_CLOSE,
1910 session->s_seq);
a79832f2
SW		 1911 if (!msg)
1912 return -ENOMEM;
1913 ceph_con_send(&session->s_con, msg);
fcff415c 1914 return 1;
2f2dc053
SW		 1915}
1916
1917/*
1918 * Called with s_mutex held.
1919 */
1920static int __close_session(struct ceph_mds_client *mdsc,
1921 struct ceph_mds_session *session)
1922{
1923 if (session->s_state >= CEPH_MDS_SESSION_CLOSING)
1924 return 0;
1925 session->s_state = CEPH_MDS_SESSION_CLOSING;
3e699bd8 1926 return request_close_session(session);
2f2dc053
SW		 1927}
1928
040d7860
YZ		 1929static bool drop_negative_children(struct dentry *dentry)
1930{
1931 struct dentry *child;
1932 bool all_negative = true;
1933
1934 if (!d_is_dir(dentry))
1935 goto out;
1936
1937 spin_lock(&dentry->d_lock);
1938 list_for_each_entry(child, &dentry->d_subdirs, d_child) {
1939 if (d_really_is_positive(child)) {
1940 all_negative = false;
1941 break;
1942 }
1943 }
1944 spin_unlock(&dentry->d_lock);
1945
1946 if (all_negative)
1947 shrink_dcache_parent(dentry);
1948out:
1949 return all_negative;
1950}
1951
2f2dc053
SW		 1952/*
1953 * Trim old(er) caps.
1954 *
1955 * Because we can't cache an inode without one or more caps, we do
1956 * this indirectly: if a cap is unused, we prune its aliases, at which
1957 * point the inode will hopefully get dropped to.
1958 *
1959 * Yes, this is a bit sloppy. Our only real goal here is to respond to
1960 * memory pressure from the MDS, though, so it needn't be perfect.
1961 */
1962static int trim_caps_cb(struct inode *inode, struct ceph_cap *cap, void *arg)
1963{
533a2818 1964 int *remaining = arg;
2f2dc053 1965 struct ceph_inode_info *ci = ceph_inode(inode);
979abfdd 1966 int used, wanted, oissued, mine;
2f2dc053 1967
533a2818 1968 if (*remaining <= 0)
2f2dc053
SW		 1969 return -1;
1970
be655596 1971 spin_lock(&ci->i_ceph_lock);
2f2dc053
SW		 1972 mine = cap->issued | cap->implemented;
1973 used = __ceph_caps_used(ci);
979abfdd 1974 wanted = __ceph_caps_file_wanted(ci);
2f2dc053
SW		 1975 oissued = __ceph_caps_issued_other(ci, cap);
1976
979abfdd 1977 dout("trim_caps_cb %p cap %p mine %s oissued %s used %s wanted %s\n",
2f2dc053 1978 inode, cap, ceph_cap_string(mine), ceph_cap_string(oissued),
979abfdd
YZ		 1979 ceph_cap_string(used), ceph_cap_string(wanted));
1980 if (cap == ci->i_auth_cap) {
622f3e25
YZ		 1981 if (ci->i_dirty_caps || ci->i_flushing_caps ||
1982 !list_empty(&ci->i_cap_snaps))
979abfdd
YZ		 1983 goto out;
1984 if ((used | wanted) & CEPH_CAP_ANY_WR)
1985 goto out;
89aa5930
YZ		 1986 /* Note: it's possible that i_filelock_ref becomes non-zero
1987 * after dropping auth caps. It doesn't hurt because reply
1988 * of lock mds request will re-add auth caps. */
1989 if (atomic_read(&ci->i_filelock_ref) > 0)
1990 goto out;
979abfdd 1991 }
5e804ac4
YZ		 1992 /* The inode has cached pages, but it's no longer used.
1993 * we can safely drop it */
525d15e8
YZ		 1994 if (S_ISREG(inode->i_mode) &&
1995 wanted == 0 && used == CEPH_CAP_FILE_CACHE &&
5e804ac4
YZ		 1996 !(oissued & CEPH_CAP_FILE_CACHE)) {
1997 used = 0;
1998 oissued = 0;
1999 }
979abfdd 2000 if ((used | wanted) & ~oissued & mine)
2f2dc053
SW		 2001 goto out; /* we need these caps */
2002
2f2dc053
SW		 2003 if (oissued) {
2004 /* we aren't the only cap.. just remove us */
a76d0a9c 2005 ceph_remove_cap(cap, true);
533a2818 2006 (*remaining)--;
2f2dc053 2007 } else {
040d7860 2008 struct dentry *dentry;
5e804ac4 2009 /* try dropping referring dentries */
be655596 2010 spin_unlock(&ci->i_ceph_lock);
040d7860
YZ		 2011 dentry = d_find_any_alias(inode);
2012 if (dentry && drop_negative_children(dentry)) {
2013 int count;
2014 dput(dentry);
2015 d_prune_aliases(inode);
2016 count = atomic_read(&inode->i_count);
2017 if (count == 1)
533a2818 2018 (*remaining)--;
040d7860
YZ		 2019 dout("trim_caps_cb %p cap %p pruned, count now %d\n",
2020 inode, cap, count);
2021 } else {
2022 dput(dentry);
2023 }
2f2dc053
SW		 2024 return 0;
2025 }
2026
2027out:
be655596 2028 spin_unlock(&ci->i_ceph_lock);
2f2dc053
SW		 2029 return 0;
2030}
2031
2032/*
2033 * Trim session cap count down to some max number.
2034 */
e30ee581
ZZ		 2035int ceph_trim_caps(struct ceph_mds_client *mdsc,
2036 struct ceph_mds_session *session,
2037 int max_caps)
2f2dc053
SW		 2038{
2039 int trim_caps = session->s_nr_caps - max_caps;
2040
2041 dout("trim_caps mds%d start: %d / %d, trim %d\n",
2042 session->s_mds, session->s_nr_caps, max_caps, trim_caps);
2043 if (trim_caps > 0) {
533a2818
JL		 2044 int remaining = trim_caps;
2045
2046 ceph_iterate_session_caps(session, trim_caps_cb, &remaining);
2f2dc053
SW		 2047 dout("trim_caps mds%d done: %d / %d, trimmed %d\n",
2048 session->s_mds, session->s_nr_caps, max_caps,
533a2818 2049 trim_caps - remaining);
2f2dc053 2050 }
a56371d9 2051
e3ec8d68 2052 ceph_flush_cap_releases(mdsc, session);
2f2dc053
SW		 2053 return 0;
2054}
2055
8310b089
YZ		 2056static int check_caps_flush(struct ceph_mds_client *mdsc,
2057 u64 want_flush_tid)
2058{
8310b089
YZ		 2059 int ret = 1;
2060
2061 spin_lock(&mdsc->cap_dirty_lock);
e4500b5e
YZ		 2062 if (!list_empty(&mdsc->cap_flush_list)) {
2063 struct ceph_cap_flush *cf =
2064 list_first_entry(&mdsc->cap_flush_list,
2065 struct ceph_cap_flush, g_list);
2066 if (cf->tid <= want_flush_tid) {
2067 dout("check_caps_flush still flushing tid "
2068 "%llu <= %llu\n", cf->tid, want_flush_tid);
2069 ret = 0;
2070 }
8310b089
YZ		 2071 }
2072 spin_unlock(&mdsc->cap_dirty_lock);
2073 return ret;
d3383a8e
YZ		 2074}
2075
2f2dc053
SW		 2076/*
2077 * flush all dirty inode data to disk.
2078 *
8310b089 2079 * returns true if we've flushed through want_flush_tid
2f2dc053 2080 */
affbc19a 2081static void wait_caps_flush(struct ceph_mds_client *mdsc,
0e294387 2082 u64 want_flush_tid)
2f2dc053 2083{
0e294387 2084 dout("check_caps_flush want %llu\n", want_flush_tid);
8310b089
YZ		 2085
2086 wait_event(mdsc->cap_flushing_wq,
2087 check_caps_flush(mdsc, want_flush_tid));
2088
2089 dout("check_caps_flush ok, flushed thru %llu\n", want_flush_tid);
2f2dc053
SW		 2090}
2091
2092/*
2093 * called under s_mutex
2094 */
e3ec8d68
YZ		 2095static void ceph_send_cap_releases(struct ceph_mds_client *mdsc,
2096 struct ceph_mds_session *session)
2f2dc053 2097{
745a8e3b
YZ		 2098 struct ceph_msg *msg = NULL;
2099 struct ceph_mds_cap_release *head;
2100 struct ceph_mds_cap_item *item;
92475f05 2101 struct ceph_osd_client *osdc = &mdsc->fsc->client->osdc;
745a8e3b
YZ		 2102 struct ceph_cap *cap;
2103 LIST_HEAD(tmp_list);
2104 int num_cap_releases;
92475f05
JL		 2105 __le32 barrier, *cap_barrier;
2106
2107 down_read(&osdc->lock);
2108 barrier = cpu_to_le32(osdc->epoch_barrier);
2109 up_read(&osdc->lock);
2f2dc053 2110
0f8605f2 2111 spin_lock(&session->s_cap_lock);
745a8e3b
YZ		 2112again:
2113 list_splice_init(&session->s_cap_releases, &tmp_list);
2114 num_cap_releases = session->s_num_cap_releases;
2115 session->s_num_cap_releases = 0;
2f2dc053 2116 spin_unlock(&session->s_cap_lock);
e01a5946 2117
745a8e3b
YZ		 2118 while (!list_empty(&tmp_list)) {
2119 if (!msg) {
2120 msg = ceph_msg_new(CEPH_MSG_CLIENT_CAPRELEASE,
09cbfeaf 2121 PAGE_SIZE, GFP_NOFS, false);
745a8e3b
YZ		 2122 if (!msg)
2123 goto out_err;
2124 head = msg->front.iov_base;
2125 head->num = cpu_to_le32(0);
2126 msg->front.iov_len = sizeof(*head);
92475f05
JL		 2127
2128 msg->hdr.version = cpu_to_le16(2);
2129 msg->hdr.compat_version = cpu_to_le16(1);
745a8e3b 2130 }
92475f05 2131
745a8e3b
YZ		 2132 cap = list_first_entry(&tmp_list, struct ceph_cap,
2133 session_caps);
2134 list_del(&cap->session_caps);
2135 num_cap_releases--;
e01a5946 2136
00bd8edb 2137 head = msg->front.iov_base;
4198aba4
JL		 2138 put_unaligned_le32(get_unaligned_le32(&head->num) + 1,
2139 &head->num);
745a8e3b
YZ		 2140 item = msg->front.iov_base + msg->front.iov_len;
2141 item->ino = cpu_to_le64(cap->cap_ino);
2142 item->cap_id = cpu_to_le64(cap->cap_id);
2143 item->migrate_seq = cpu_to_le32(cap->mseq);
2144 item->seq = cpu_to_le32(cap->issue_seq);
2145 msg->front.iov_len += sizeof(*item);
2146
2147 ceph_put_cap(mdsc, cap);
2148
2149 if (le32_to_cpu(head->num) == CEPH_CAPS_PER_RELEASE) {
92475f05
JL		 2150 // Append cap_barrier field
2151 cap_barrier = msg->front.iov_base + msg->front.iov_len;
2152 *cap_barrier = barrier;
2153 msg->front.iov_len += sizeof(*cap_barrier);
2154
745a8e3b
YZ		 2155 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
2156 dout("send_cap_releases mds%d %p\n", session->s_mds, msg);
2157 ceph_con_send(&session->s_con, msg);
2158 msg = NULL;
2159 }
00bd8edb 2160 }
e01a5946 2161
745a8e3b 2162 BUG_ON(num_cap_releases != 0);
e01a5946 2163
745a8e3b
YZ		 2164 spin_lock(&session->s_cap_lock);
2165 if (!list_empty(&session->s_cap_releases))
2166 goto again;
2167 spin_unlock(&session->s_cap_lock);
2168
2169 if (msg) {
92475f05
JL		 2170 // Append cap_barrier field
2171 cap_barrier = msg->front.iov_base + msg->front.iov_len;
2172 *cap_barrier = barrier;
2173 msg->front.iov_len += sizeof(*cap_barrier);
2174
745a8e3b
YZ		 2175 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
2176 dout("send_cap_releases mds%d %p\n", session->s_mds, msg);
2177 ceph_con_send(&session->s_con, msg);
e01a5946 2178 }
745a8e3b
YZ		 2179 return;
2180out_err:
2181 pr_err("send_cap_releases mds%d, failed to allocate message\n",
2182 session->s_mds);
2183 spin_lock(&session->s_cap_lock);
2184 list_splice(&tmp_list, &session->s_cap_releases);
2185 session->s_num_cap_releases += num_cap_releases;
2186 spin_unlock(&session->s_cap_lock);
e01a5946
SW		 2187}
2188
e3ec8d68
YZ		 2189static void ceph_cap_release_work(struct work_struct *work)
2190{
2191 struct ceph_mds_session *session =
2192 container_of(work, struct ceph_mds_session, s_cap_release_work);
2193
2194 mutex_lock(&session->s_mutex);
2195 if (session->s_state == CEPH_MDS_SESSION_OPEN ||
2196 session->s_state == CEPH_MDS_SESSION_HUNG)
2197 ceph_send_cap_releases(session->s_mdsc, session);
2198 mutex_unlock(&session->s_mutex);
2199 ceph_put_mds_session(session);
2200}
2201
2202void ceph_flush_cap_releases(struct ceph_mds_client *mdsc,
2203 struct ceph_mds_session *session)
2204{
2205 if (mdsc->stopping)
2206 return;
2207
5b3248c6 2208 ceph_get_mds_session(session);
e3ec8d68
YZ		 2209 if (queue_work(mdsc->fsc->cap_wq,
2210 &session->s_cap_release_work)) {
2211 dout("cap release work queued\n");
2212 } else {
2213 ceph_put_mds_session(session);
2214 dout("failed to queue cap release work\n");
2215 }
2216}
2217
2218/*
2219 * caller holds session->s_cap_lock
2220 */
2221void __ceph_queue_cap_release(struct ceph_mds_session *session,
2222 struct ceph_cap *cap)
2223{
2224 list_add_tail(&cap->session_caps, &session->s_cap_releases);
2225 session->s_num_cap_releases++;
2226
2227 if (!(session->s_num_cap_releases % CEPH_CAPS_PER_RELEASE))
2228 ceph_flush_cap_releases(session->s_mdsc, session);
2229}
2230
37c4efc1
YZ		 2231static void ceph_cap_reclaim_work(struct work_struct *work)
2232{
2233 struct ceph_mds_client *mdsc =
2234 container_of(work, struct ceph_mds_client, cap_reclaim_work);
2235 int ret = ceph_trim_dentries(mdsc);
2236 if (ret == -EAGAIN)
2237 ceph_queue_cap_reclaim_work(mdsc);
2238}
2239
2240void ceph_queue_cap_reclaim_work(struct ceph_mds_client *mdsc)
2241{
2242 if (mdsc->stopping)
2243 return;
2244
2245 if (queue_work(mdsc->fsc->cap_wq, &mdsc->cap_reclaim_work)) {
2246 dout("caps reclaim work queued\n");
2247 } else {
2248 dout("failed to queue caps release work\n");
2249 }
2250}
2251
fe33032d
YZ		 2252void ceph_reclaim_caps_nr(struct ceph_mds_client *mdsc, int nr)
2253{
2254 int val;
2255 if (!nr)
2256 return;
2257 val = atomic_add_return(nr, &mdsc->cap_reclaim_pending);
bba1560b 2258 if ((val % CEPH_CAPS_PER_RELEASE) < nr) {
fe33032d
YZ		 2259 atomic_set(&mdsc->cap_reclaim_pending, 0);
2260 ceph_queue_cap_reclaim_work(mdsc);
2261 }
2262}
2263
2f2dc053
SW		 2264/*
2265 * requests
2266 */
2267
54008399
YZ		 2268int ceph_alloc_readdir_reply_buffer(struct ceph_mds_request *req,
2269 struct inode *dir)
2270{
2271 struct ceph_inode_info *ci = ceph_inode(dir);
2272 struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
2273 struct ceph_mount_options *opt = req->r_mdsc->fsc->mount_options;
2a5beea3 2274 size_t size = sizeof(struct ceph_mds_reply_dir_entry);
ad8c28a9
JL		 2275 unsigned int num_entries;
2276 int order;
54008399
YZ		 2277
2278 spin_lock(&ci->i_ceph_lock);
2279 num_entries = ci->i_files + ci->i_subdirs;
2280 spin_unlock(&ci->i_ceph_lock);
ad8c28a9 2281 num_entries = max(num_entries, 1U);
54008399
YZ		 2282 num_entries = min(num_entries, opt->max_readdir);
2283
2284 order = get_order(size * num_entries);
2285 while (order >= 0) {
2a5beea3
YZ		 2286 rinfo->dir_entries = (void*)__get_free_pages(GFP_KERNEL |
2287 __GFP_NOWARN,
2288 order);
2289 if (rinfo->dir_entries)
54008399
YZ		 2290 break;
2291 order--;
2292 }
2a5beea3 2293 if (!rinfo->dir_entries)
54008399
YZ		 2294 return -ENOMEM;
2295
2296 num_entries = (PAGE_SIZE << order) / size;
2297 num_entries = min(num_entries, opt->max_readdir);
2298
2299 rinfo->dir_buf_size = PAGE_SIZE << order;
2300 req->r_num_caps = num_entries + 1;
2301 req->r_args.readdir.max_entries = cpu_to_le32(num_entries);
2302 req->r_args.readdir.max_bytes = cpu_to_le32(opt->max_readdir_bytes);
2303 return 0;
2304}
2305
2f2dc053
SW		 2306/*
2307 * Create an mds request.
2308 */
2309struct ceph_mds_request *
2310ceph_mdsc_create_request(struct ceph_mds_client *mdsc, int op, int mode)
2311{
058daab7 2312 struct ceph_mds_request *req;
2f2dc053 2313
058daab7 2314 req = kmem_cache_zalloc(ceph_mds_request_cachep, GFP_NOFS);
2f2dc053
SW		 2315 if (!req)
2316 return ERR_PTR(-ENOMEM);
2317
b4556396 2318 mutex_init(&req->r_fill_mutex);
37151668 2319 req->r_mdsc = mdsc;
2f2dc053 2320 req->r_started = jiffies;
70c94820 2321 req->r_start_latency = ktime_get();
2f2dc053
SW		 2322 req->r_resend_mds = -1;
2323 INIT_LIST_HEAD(&req->r_unsafe_dir_item);
68cd5b4b 2324 INIT_LIST_HEAD(&req->r_unsafe_target_item);
2f2dc053 2325 req->r_fmode = -1;
153c8e6b 2326 kref_init(&req->r_kref);
fcd00b68 2327 RB_CLEAR_NODE(&req->r_node);
2f2dc053
SW		 2328 INIT_LIST_HEAD(&req->r_wait);
2329 init_completion(&req->r_completion);
2330 init_completion(&req->r_safe_completion);
2331 INIT_LIST_HEAD(&req->r_unsafe_item);
2332
668c9a61 2333 ktime_get_coarse_real_ts64(&req->r_stamp);
b8e69066 2334
2f2dc053
SW		 2335 req->r_op = op;
2336 req->r_direct_mode = mode;
2337 return req;
2338}
2339
2340/*
44ca18f2 2341 * return oldest (lowest) request, tid in request tree, 0 if none.
2f2dc053
SW		 2342 *
2343 * called under mdsc->mutex.
2344 */
44ca18f2
SW		 2345static struct ceph_mds_request *__get_oldest_req(struct ceph_mds_client *mdsc)
2346{
2347 if (RB_EMPTY_ROOT(&mdsc->request_tree))
2348 return NULL;
2349 return rb_entry(rb_first(&mdsc->request_tree),
2350 struct ceph_mds_request, r_node);
2351}
2352
e8a7b8b1 2353static inline u64 __get_oldest_tid(struct ceph_mds_client *mdsc)
2f2dc053 2354{
e8a7b8b1 2355 return mdsc->oldest_tid;
2f2dc053
SW		 2356}
2357
2358/*
2359 * Build a dentry's path. Allocate on heap; caller must kfree. Based
2360 * on build_path_from_dentry in fs/cifs/dir.c.
2361 *
2362 * If @stop_on_nosnap, generate path relative to the first non-snapped
2363 * inode.
2364 *
2365 * Encode hidden .snap dirs as a double /, i.e.
2366 * foo/.snap/bar -> foo//bar
2367 */
69a10fb3 2368char *ceph_mdsc_build_path(struct dentry *dentry, int *plen, u64 *pbase,
2f2dc053
SW		 2369 int stop_on_nosnap)
2370{
2371 struct dentry *temp;
2372 char *path;
f77f21bb 2373 int pos;
1b71fe2e 2374 unsigned seq;
69a10fb3 2375 u64 base;
2f2dc053 2376
d37b1d99 2377 if (!dentry)
2f2dc053
SW		 2378 return ERR_PTR(-EINVAL);
2379
f77f21bb 2380 path = __getname();
d37b1d99 2381 if (!path)
2f2dc053 2382 return ERR_PTR(-ENOMEM);
f77f21bb
JL		 2383retry:
2384 pos = PATH_MAX - 1;
2385 path[pos] = '\0';
2386
2387 seq = read_seqbegin(&rename_lock);
1b71fe2e 2388 rcu_read_lock();
f77f21bb
JL		 2389 temp = dentry;
2390 for (;;) {
1b71fe2e 2391 struct inode *inode;
2f2dc053 2392
1b71fe2e 2393 spin_lock(&temp->d_lock);
2b0143b5 2394 inode = d_inode(temp);
2f2dc053 2395 if (inode && ceph_snap(inode) == CEPH_SNAPDIR) {
104648ad 2396 dout("build_path path+%d: %p SNAPDIR\n",
2f2dc053 2397 pos, temp);
d6b8bd67 2398 } else if (stop_on_nosnap && inode && dentry != temp &&
2f2dc053 2399 ceph_snap(inode) == CEPH_NOSNAP) {
9d5a09e6 2400 spin_unlock(&temp->d_lock);
d6b8bd67 2401 pos++; /* get rid of any prepended '/' */
2f2dc053
SW		 2402 break;
2403 } else {
2404 pos -= temp->d_name.len;
1b71fe2e
AV		 2405 if (pos < 0) {
2406 spin_unlock(&temp->d_lock);
2f2dc053 2407 break;
1b71fe2e 2408 }
f77f21bb 2409 memcpy(path + pos, temp->d_name.name, temp->d_name.len);
2f2dc053 2410 }
1b71fe2e 2411 spin_unlock(&temp->d_lock);
41883ba8 2412 temp = READ_ONCE(temp->d_parent);
f77f21bb
JL		 2413
2414 /* Are we at the root? */
2415 if (IS_ROOT(temp))
2416 break;
2417
2418 /* Are we out of buffer? */
2419 if (--pos < 0)
2420 break;
2421
2422 path[pos] = '/';
2f2dc053 2423 }
69a10fb3 2424 base = ceph_ino(d_inode(temp));
1b71fe2e 2425 rcu_read_unlock();
f5946bcc
JL		 2426
2427 if (read_seqretry(&rename_lock, seq))
2428 goto retry;
2429
2430 if (pos < 0) {
2431 /*
2432 * A rename didn't occur, but somehow we didn't end up where
2433 * we thought we would. Throw a warning and try again.
2434 */
2435 pr_warn("build_path did not end path lookup where "
2436 "expected, pos is %d\n", pos);
2f2dc053
SW		 2437 goto retry;
2438 }
2439
69a10fb3 2440 *pbase = base;
f77f21bb 2441 *plen = PATH_MAX - 1 - pos;
104648ad 2442 dout("build_path on %p %d built %llx '%.*s'\n",
f77f21bb
JL		 2443 dentry, d_count(dentry), base, *plen, path + pos);
2444 return path + pos;
2f2dc053
SW		 2445}
2446
fd36a717 2447static int build_dentry_path(struct dentry *dentry, struct inode *dir,
2f2dc053 2448 const char **ppath, int *ppathlen, u64 *pino,
1bcb3440 2449 bool *pfreepath, bool parent_locked)
2f2dc053
SW		 2450{
2451 char *path;
2452
c6b0b656 2453 rcu_read_lock();
fd36a717
JL		 2454 if (!dir)
2455 dir = d_inode_rcu(dentry->d_parent);
964fff74 2456 if (dir && parent_locked && ceph_snap(dir) == CEPH_NOSNAP) {
c6b0b656
JL		 2457 *pino = ceph_ino(dir);
2458 rcu_read_unlock();
964fff74
JL		 2459 *ppath = dentry->d_name.name;
2460 *ppathlen = dentry->d_name.len;
2f2dc053
SW		 2461 return 0;
2462 }
c6b0b656 2463 rcu_read_unlock();
2f2dc053
SW		 2464 path = ceph_mdsc_build_path(dentry, ppathlen, pino, 1);
2465 if (IS_ERR(path))
2466 return PTR_ERR(path);
2467 *ppath = path;
1bcb3440 2468 *pfreepath = true;
2f2dc053
SW		 2469 return 0;
2470}
2471
2472static int build_inode_path(struct inode *inode,
2473 const char **ppath, int *ppathlen, u64 *pino,
1bcb3440 2474 bool *pfreepath)
2f2dc053
SW		 2475{
2476 struct dentry *dentry;
2477 char *path;
2478
2479 if (ceph_snap(inode) == CEPH_NOSNAP) {
2480 *pino = ceph_ino(inode);
2481 *ppathlen = 0;
2482 return 0;
2483 }
2484 dentry = d_find_alias(inode);
2485 path = ceph_mdsc_build_path(dentry, ppathlen, pino, 1);
2486 dput(dentry);
2487 if (IS_ERR(path))
2488 return PTR_ERR(path);
2489 *ppath = path;
1bcb3440 2490 *pfreepath = true;
2f2dc053
SW		 2491 return 0;
2492}
2493
2494/*
2495 * request arguments may be specified via an inode *, a dentry *, or
2496 * an explicit ino+path.
2497 */
2498static int set_request_path_attr(struct inode *rinode, struct dentry *rdentry,
fd36a717
JL		 2499 struct inode *rdiri, const char *rpath,
2500 u64 rino, const char **ppath, int *pathlen,
1bcb3440 2501 u64 *ino, bool *freepath, bool parent_locked)
2f2dc053
SW		 2502{
2503 int r = 0;
2504
2505 if (rinode) {
2506 r = build_inode_path(rinode, ppath, pathlen, ino, freepath);
2507 dout(" inode %p %llx.%llx\n", rinode, ceph_ino(rinode),
2508 ceph_snap(rinode));
2509 } else if (rdentry) {
fd36a717 2510 r = build_dentry_path(rdentry, rdiri, ppath, pathlen, ino,
1bcb3440 2511 freepath, parent_locked);
2f2dc053
SW		 2512 dout(" dentry %p %llx/%.*s\n", rdentry, *ino, *pathlen,
2513 *ppath);
795858db 2514 } else if (rpath || rino) {
2f2dc053
SW		 2515 *ino = rino;
2516 *ppath = rpath;
b000056a 2517 *pathlen = rpath ? strlen(rpath) : 0;
2f2dc053
SW		 2518 dout(" path %.*s\n", *pathlen, rpath);
2519 }
2520
2521 return r;
2522}
2523
60267ba3
ID		 2524static void encode_timestamp_and_gids(void **p,
2525 const struct ceph_mds_request *req)
2526{
2527 struct ceph_timespec ts;
2528 int i;
2529
2530 ceph_encode_timespec64(&ts, &req->r_stamp);
2531 ceph_encode_copy(p, &ts, sizeof(ts));
2532
2533 /* gid_list */
2534 ceph_encode_32(p, req->r_cred->group_info->ngroups);
2535 for (i = 0; i < req->r_cred->group_info->ngroups; i++)
2536 ceph_encode_64(p, from_kgid(&init_user_ns,
2537 req->r_cred->group_info->gid[i]));
2538}
2539
2f2dc053
SW		 2540/*
2541 * called under mdsc->mutex
2542 */
4f1ddb1e 2543static struct ceph_msg *create_request_message(struct ceph_mds_session *session,
2f2dc053 2544 struct ceph_mds_request *req,
4f1ddb1e 2545 bool drop_cap_releases)
2f2dc053 2546{
4f1ddb1e
JL		 2547 int mds = session->s_mds;
2548 struct ceph_mds_client *mdsc = session->s_mdsc;
2f2dc053 2549 struct ceph_msg *msg;
4f1ddb1e 2550 struct ceph_mds_request_head_old *head;
2f2dc053
SW		 2551 const char *path1 = NULL;
2552 const char *path2 = NULL;
2553 u64 ino1 = 0, ino2 = 0;
2554 int pathlen1 = 0, pathlen2 = 0;
1bcb3440 2555 bool freepath1 = false, freepath2 = false;
60267ba3 2556 int len;
2f2dc053
SW		 2557 u16 releases;
2558 void *p, *end;
2559 int ret;
4f1ddb1e 2560 bool legacy = !(session->s_con.peer_features & CEPH_FEATURE_FS_BTIME);
2f2dc053
SW		 2561
2562 ret = set_request_path_attr(req->r_inode, req->r_dentry,
3dd69aab 2563 req->r_parent, req->r_path1, req->r_ino1.ino,
1bcb3440
JL		 2564 &path1, &pathlen1, &ino1, &freepath1,
2565 test_bit(CEPH_MDS_R_PARENT_LOCKED,
2566 &req->r_req_flags));
2f2dc053
SW		 2567 if (ret < 0) {
2568 msg = ERR_PTR(ret);
2569 goto out;
2570 }
2571
1bcb3440 2572 /* If r_old_dentry is set, then assume that its parent is locked */
2f2dc053 2573 ret = set_request_path_attr(NULL, req->r_old_dentry,
fd36a717 2574 req->r_old_dentry_dir,
2f2dc053 2575 req->r_path2, req->r_ino2.ino,
1bcb3440 2576 &path2, &pathlen2, &ino2, &freepath2, true);
2f2dc053
SW		 2577 if (ret < 0) {
2578 msg = ERR_PTR(ret);
2579 goto out_free1;
2580 }
2581
60267ba3 2582 len = legacy ? sizeof(*head) : sizeof(struct ceph_mds_request_head);
4f1ddb1e 2583 len += pathlen1 + pathlen2 + 2*(1 + sizeof(u32) + sizeof(u64)) +
777d738a 2584 sizeof(struct ceph_timespec);
60267ba3 2585 len += sizeof(u32) + (sizeof(u64) * req->r_cred->group_info->ngroups);
2f2dc053
SW		 2586
2587 /* calculate (max) length for cap releases */
2588 len += sizeof(struct ceph_mds_request_release) *
2589 (!!req->r_inode_drop + !!req->r_dentry_drop +
2590 !!req->r_old_inode_drop + !!req->r_old_dentry_drop);
4f1ddb1e 2591
2f2dc053 2592 if (req->r_dentry_drop)
c1dfc277 2593 len += pathlen1;
2f2dc053 2594 if (req->r_old_dentry_drop)
c1dfc277 2595 len += pathlen2;
2f2dc053 2596
0d9c1ab3 2597 msg = ceph_msg_new2(CEPH_MSG_CLIENT_REQUEST, len, 1, GFP_NOFS, false);
a79832f2
SW		 2598 if (!msg) {
2599 msg = ERR_PTR(-ENOMEM);
2f2dc053 2600 goto out_free2;
a79832f2 2601 }
2f2dc053 2602
6df058c0
SW		 2603 msg->hdr.tid = cpu_to_le64(req->r_tid);
2604
4f1ddb1e 2605 /*
60267ba3 2606 * The old ceph_mds_request_head didn't contain a version field, and
4f1ddb1e
JL		 2607 * one was added when we moved the message version from 3->4.
2608 */
2609 if (legacy) {
2610 msg->hdr.version = cpu_to_le16(3);
2611 head = msg->front.iov_base;
2612 p = msg->front.iov_base + sizeof(*head);
2613 } else {
2614 struct ceph_mds_request_head *new_head = msg->front.iov_base;
2615
2616 msg->hdr.version = cpu_to_le16(4);
2617 new_head->version = cpu_to_le16(CEPH_MDS_REQUEST_HEAD_VERSION);
2618 head = (struct ceph_mds_request_head_old *)&new_head->oldest_client_tid;
2619 p = msg->front.iov_base + sizeof(*new_head);
2620 }
2621
2f2dc053
SW		 2622 end = msg->front.iov_base + msg->front.iov_len;
2623
2624 head->mdsmap_epoch = cpu_to_le32(mdsc->mdsmap->m_epoch);
2625 head->op = cpu_to_le32(req->r_op);
7fe0cdeb
JL		 2626 head->caller_uid = cpu_to_le32(from_kuid(&init_user_ns,
2627 req->r_cred->fsuid));
2628 head->caller_gid = cpu_to_le32(from_kgid(&init_user_ns,
2629 req->r_cred->fsgid));
6deb8008 2630 head->ino = cpu_to_le64(req->r_deleg_ino);
2f2dc053
SW		 2631 head->args = req->r_args;
2632
2633 ceph_encode_filepath(&p, end, ino1, path1);
2634 ceph_encode_filepath(&p, end, ino2, path2);
2635
e979cf50
SW		 2636 /* make note of release offset, in case we need to replay */
2637 req->r_request_release_offset = p - msg->front.iov_base;
2638
2f2dc053
SW		 2639 /* cap releases */
2640 releases = 0;
2641 if (req->r_inode_drop)
2642 releases += ceph_encode_inode_release(&p,
2b0143b5 2643 req->r_inode ? req->r_inode : d_inode(req->r_dentry),
719a2514
YZ		 2644 mds, req->r_inode_drop, req->r_inode_unless,
2645 req->r_op == CEPH_MDS_OP_READDIR);
2f2dc053
SW		 2646 if (req->r_dentry_drop)
2647 releases += ceph_encode_dentry_release(&p, req->r_dentry,
3dd69aab 2648 req->r_parent, mds, req->r_dentry_drop,
ca6c8ae0 2649 req->r_dentry_unless);
2f2dc053
SW		 2650 if (req->r_old_dentry_drop)
2651 releases += ceph_encode_dentry_release(&p, req->r_old_dentry,
ca6c8ae0
JL		 2652 req->r_old_dentry_dir, mds,
2653 req->r_old_dentry_drop,
2654 req->r_old_dentry_unless);
2f2dc053
SW		 2655 if (req->r_old_inode_drop)
2656 releases += ceph_encode_inode_release(&p,
2b0143b5 2657 d_inode(req->r_old_dentry),
2f2dc053 2658 mds, req->r_old_inode_drop, req->r_old_inode_unless, 0);
6e6f0923
YZ		 2659
2660 if (drop_cap_releases) {
2661 releases = 0;
2662 p = msg->front.iov_base + req->r_request_release_offset;
2663 }
2664
2f2dc053
SW		 2665 head->num_releases = cpu_to_le16(releases);
2666
60267ba3 2667 encode_timestamp_and_gids(&p, req);
4f1ddb1e 2668
b682c6d4
XL		 2669 if (WARN_ON_ONCE(p > end)) {
2670 ceph_msg_put(msg);
2671 msg = ERR_PTR(-ERANGE);
2672 goto out_free2;
2673 }
2674
2f2dc053
SW		 2675 msg->front.iov_len = p - msg->front.iov_base;
2676 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
2677
25e6bae3
YZ		 2678 if (req->r_pagelist) {
2679 struct ceph_pagelist *pagelist = req->r_pagelist;
25e6bae3
YZ		 2680 ceph_msg_data_add_pagelist(msg, pagelist);
2681 msg->hdr.data_len = cpu_to_le32(pagelist->length);
2682 } else {
2683 msg->hdr.data_len = 0;
ebf18f47 2684 }
02afca6c 2685
2f2dc053
SW		 2686 msg->hdr.data_off = cpu_to_le16(0);
2687
2688out_free2:
2689 if (freepath2)
f77f21bb 2690 ceph_mdsc_free_path((char *)path2, pathlen2);
2f2dc053
SW		 2691out_free1:
2692 if (freepath1)
f77f21bb 2693 ceph_mdsc_free_path((char *)path1, pathlen1);
2f2dc053
SW		 2694out:
2695 return msg;
2696}
2697
2698/*
2699 * called under mdsc->mutex if error, under no mutex if
2700 * success.
2701 */
2702static void complete_request(struct ceph_mds_client *mdsc,
2703 struct ceph_mds_request *req)
2704{
70c94820
XL		 2705 req->r_end_latency = ktime_get();
2706
2f2dc053
SW		 2707 if (req->r_callback)
2708 req->r_callback(mdsc, req);
111c7081 2709 complete_all(&req->r_completion);
2f2dc053
SW		 2710}
2711
4f1ddb1e
JL		 2712static struct ceph_mds_request_head_old *
2713find_old_request_head(void *p, u64 features)
2714{
2715 bool legacy = !(features & CEPH_FEATURE_FS_BTIME);
2716 struct ceph_mds_request_head *new_head;
2717
2718 if (legacy)
2719 return (struct ceph_mds_request_head_old *)p;
2720 new_head = (struct ceph_mds_request_head *)p;
2721 return (struct ceph_mds_request_head_old *)&new_head->oldest_client_tid;
2722}
2723
2f2dc053
SW		 2724/*
2725 * called under mdsc->mutex
2726 */
396bd62c 2727static int __prepare_send_request(struct ceph_mds_session *session,
2f2dc053 2728 struct ceph_mds_request *req,
396bd62c 2729 bool drop_cap_releases)
2f2dc053 2730{
396bd62c
JL		 2731 int mds = session->s_mds;
2732 struct ceph_mds_client *mdsc = session->s_mdsc;
4f1ddb1e 2733 struct ceph_mds_request_head_old *rhead;
2f2dc053
SW		 2734 struct ceph_msg *msg;
2735 int flags = 0;
2736
2f2dc053 2737 req->r_attempts++;
e55b71f8
GF		 2738 if (req->r_inode) {
2739 struct ceph_cap *cap =
2740 ceph_get_cap_for_mds(ceph_inode(req->r_inode), mds);
2741
2742 if (cap)
2743 req->r_sent_on_mseq = cap->mseq;
2744 else
2745 req->r_sent_on_mseq = -1;
2746 }
2f2dc053
SW		 2747 dout("prepare_send_request %p tid %lld %s (attempt %d)\n", req,
2748 req->r_tid, ceph_mds_op_name(req->r_op), req->r_attempts);
2749
bc2de10d 2750 if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) {
c5c9a0bf 2751 void *p;
4f1ddb1e 2752
01a92f17
SW		 2753 /*
2754 * Replay. Do not regenerate message (and rebuild
2755 * paths, etc.); just use the original message.
2756 * Rebuilding paths will break for renames because
2757 * d_move mangles the src name.
2758 */
2759 msg = req->r_request;
4f1ddb1e
JL		 2760 rhead = find_old_request_head(msg->front.iov_base,
2761 session->s_con.peer_features);
01a92f17
SW		 2762
2763 flags = le32_to_cpu(rhead->flags);
2764 flags |= CEPH_MDS_FLAG_REPLAY;
2765 rhead->flags = cpu_to_le32(flags);
2766
2767 if (req->r_target_inode)
2768 rhead->ino = cpu_to_le64(ceph_ino(req->r_target_inode));
2769
2770 rhead->num_retry = req->r_attempts - 1;
e979cf50
SW		 2771
2772 /* remove cap/dentry releases from message */
2773 rhead->num_releases = 0;
c5c9a0bf 2774
c5c9a0bf 2775 p = msg->front.iov_base + req->r_request_release_offset;
60267ba3 2776 encode_timestamp_and_gids(&p, req);
c5c9a0bf
YZ		 2777
2778 msg->front.iov_len = p - msg->front.iov_base;
2779 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
01a92f17
SW		 2780 return 0;
2781 }
2782
2f2dc053
SW		 2783 if (req->r_request) {
2784 ceph_msg_put(req->r_request);
2785 req->r_request = NULL;
2786 }
4f1ddb1e 2787 msg = create_request_message(session, req, drop_cap_releases);
2f2dc053 2788 if (IS_ERR(msg)) {
e1518c7c 2789 req->r_err = PTR_ERR(msg);
a79832f2 2790 return PTR_ERR(msg);
2f2dc053
SW		 2791 }
2792 req->r_request = msg;
2793
4f1ddb1e
JL		 2794 rhead = find_old_request_head(msg->front.iov_base,
2795 session->s_con.peer_features);
2f2dc053 2796 rhead->oldest_client_tid = cpu_to_le64(__get_oldest_tid(mdsc));
bc2de10d 2797 if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags))
2f2dc053 2798 flags |= CEPH_MDS_FLAG_REPLAY;
3bb48b41
JL		 2799 if (test_bit(CEPH_MDS_R_ASYNC, &req->r_req_flags))
2800 flags |= CEPH_MDS_FLAG_ASYNC;
3dd69aab 2801 if (req->r_parent)
2f2dc053
SW		 2802 flags |= CEPH_MDS_FLAG_WANT_DENTRY;
2803 rhead->flags = cpu_to_le32(flags);
2804 rhead->num_fwd = req->r_num_fwd;
2805 rhead->num_retry = req->r_attempts - 1;
2806
3dd69aab 2807 dout(" r_parent = %p\n", req->r_parent);
2f2dc053
SW		 2808 return 0;
2809}
2810
9cf54563
XL		 2811/*
2812 * called under mdsc->mutex
2813 */
396bd62c 2814static int __send_request(struct ceph_mds_session *session,
9cf54563
XL		 2815 struct ceph_mds_request *req,
2816 bool drop_cap_releases)
2817{
2818 int err;
2819
396bd62c 2820 err = __prepare_send_request(session, req, drop_cap_releases);
9cf54563
XL		 2821 if (!err) {
2822 ceph_msg_get(req->r_request);
2823 ceph_con_send(&session->s_con, req->r_request);
2824 }
2825
2826 return err;
2827}
2828
2f2dc053
SW		 2829/*
2830 * send request, or put it on the appropriate wait list.
2831 */
d5548492 2832static void __do_request(struct ceph_mds_client *mdsc,
2f2dc053
SW		 2833 struct ceph_mds_request *req)
2834{
2835 struct ceph_mds_session *session = NULL;
2836 int mds = -1;
48fec5d0 2837 int err = 0;
c4853e97 2838 bool random;
2f2dc053 2839
bc2de10d
JL		 2840 if (req->r_err || test_bit(CEPH_MDS_R_GOT_RESULT, &req->r_req_flags)) {
2841 if (test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags))
eb1b8af3 2842 __unregister_request(mdsc, req);
d5548492 2843 return;
eb1b8af3 2844 }
2f2dc053
SW		 2845
2846 if (req->r_timeout &&
2847 time_after_eq(jiffies, req->r_started + req->r_timeout)) {
2848 dout("do_request timed out\n");
8ccf7fcc 2849 err = -ETIMEDOUT;
2f2dc053
SW		 2850 goto finish;
2851 }
52953d55 2852 if (READ_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_SHUTDOWN) {
48fec5d0
YZ		 2853 dout("do_request forced umount\n");
2854 err = -EIO;
2855 goto finish;
2856 }
52953d55 2857 if (READ_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_MOUNTING) {
e9e427f0
YZ		 2858 if (mdsc->mdsmap_err) {
2859 err = mdsc->mdsmap_err;
2860 dout("do_request mdsmap err %d\n", err);
2861 goto finish;
2862 }
cc8e8342
YZ		 2863 if (mdsc->mdsmap->m_epoch == 0) {
2864 dout("do_request no mdsmap, waiting for map\n");
2865 list_add(&req->r_wait, &mdsc->waiting_for_map);
d5548492 2866 return;
cc8e8342 2867 }
e9e427f0
YZ		 2868 if (!(mdsc->fsc->mount_options->flags &
2869 CEPH_MOUNT_OPT_MOUNTWAIT) &&
2870 !ceph_mdsmap_is_cluster_available(mdsc->mdsmap)) {
97820058 2871 err = -EHOSTUNREACH;
e9e427f0
YZ		 2872 goto finish;
2873 }
2874 }
2f2dc053 2875
dc69e2e9
SW		 2876 put_request_session(req);
2877
c4853e97 2878 mds = __choose_mds(mdsc, req, &random);
2f2dc053
SW		 2879 if (mds < 0 ||
2880 ceph_mdsmap_get_state(mdsc->mdsmap, mds) < CEPH_MDS_STATE_ACTIVE) {
3bb48b41
JL		 2881 if (test_bit(CEPH_MDS_R_ASYNC, &req->r_req_flags)) {
2882 err = -EJUKEBOX;
2883 goto finish;
2884 }
2f2dc053
SW		 2885 dout("do_request no mds or not active, waiting for map\n");
2886 list_add(&req->r_wait, &mdsc->waiting_for_map);
d5548492 2887 return;
2f2dc053
SW		 2888 }
2889
2890 /* get, open session */
2891 session = __ceph_lookup_mds_session(mdsc, mds);
9c423956 2892 if (!session) {
2f2dc053 2893 session = register_session(mdsc, mds);
9c423956
SW		 2894 if (IS_ERR(session)) {
2895 err = PTR_ERR(session);
2896 goto finish;
2897 }
2898 }
5b3248c6 2899 req->r_session = ceph_get_mds_session(session);
dc69e2e9 2900
2f2dc053 2901 dout("do_request mds%d session %p state %s\n", mds, session,
a687ecaf 2902 ceph_session_state_name(session->s_state));
2f2dc053
SW		 2903 if (session->s_state != CEPH_MDS_SESSION_OPEN &&
2904 session->s_state != CEPH_MDS_SESSION_HUNG) {
3bb48b41
JL		 2905 /*
2906 * We cannot queue async requests since the caps and delegated
2907 * inodes are bound to the session. Just return -EJUKEBOX and
2908 * let the caller retry a sync request in that case.
2909 */
2910 if (test_bit(CEPH_MDS_R_ASYNC, &req->r_req_flags)) {
2911 err = -EJUKEBOX;
2912 goto out_session;
2913 }
4ae3713f
JL		 2914
2915 /*
2916 * If the session has been REJECTED, then return a hard error,
2917 * unless it's a CLEANRECOVER mount, in which case we'll queue
2918 * it to the mdsc queue.
2919 */
2920 if (session->s_state == CEPH_MDS_SESSION_REJECTED) {
2921 if (ceph_test_mount_opt(mdsc->fsc, CLEANRECOVER))
2922 list_add(&req->r_wait, &mdsc->waiting_for_map);
2923 else
2924 err = -EACCES;
2925 goto out_session;
2926 }
2927
2f2dc053 2928 if (session->s_state == CEPH_MDS_SESSION_NEW ||
c4853e97 2929 session->s_state == CEPH_MDS_SESSION_CLOSING) {
b682c6d4
XL		 2930 err = __open_session(mdsc, session);
2931 if (err)
2932 goto out_session;
c4853e97
XL		 2933 /* retry the same mds later */
2934 if (random)
2935 req->r_resend_mds = mds;
2936 }
2f2dc053
SW		 2937 list_add(&req->r_wait, &session->s_waiting);
2938 goto out_session;
2939 }
2940
2941 /* send request */
2f2dc053
SW		 2942 req->r_resend_mds = -1; /* forget any previous mds hint */
2943
2944 if (req->r_request_started == 0) /* note request start time */
2945 req->r_request_started = jiffies;
2946
396bd62c 2947 err = __send_request(session, req, false);
2f2dc053
SW		 2948
2949out_session:
2950 ceph_put_mds_session(session);
48fec5d0
YZ		 2951finish:
2952 if (err) {
2953 dout("__do_request early error %d\n", err);
2954 req->r_err = err;
2955 complete_request(mdsc, req);
2956 __unregister_request(mdsc, req);
2957 }
d5548492 2958 return;
2f2dc053
SW		 2959}
2960
2961/*
2962 * called under mdsc->mutex
2963 */
2964static void __wake_requests(struct ceph_mds_client *mdsc,
2965 struct list_head *head)
2966{
ed75ec2c
YZ		 2967 struct ceph_mds_request *req;
2968 LIST_HEAD(tmp_list);
2969
2970 list_splice_init(head, &tmp_list);
2f2dc053 2971
ed75ec2c
YZ		 2972 while (!list_empty(&tmp_list)) {
2973 req = list_entry(tmp_list.next,
2974 struct ceph_mds_request, r_wait);
2f2dc053 2975 list_del_init(&req->r_wait);
7971bd92 2976 dout(" wake request %p tid %llu\n", req, req->r_tid);
2f2dc053
SW		 2977 __do_request(mdsc, req);
2978 }
2979}
2980
2981/*
2982 * Wake up threads with requests pending for @mds, so that they can
29790f26 2983 * resubmit their requests to a possibly different mds.
2f2dc053 2984 */
29790f26 2985static void kick_requests(struct ceph_mds_client *mdsc, int mds)
2f2dc053 2986{
44ca18f2 2987 struct ceph_mds_request *req;
282c1052 2988 struct rb_node *p = rb_first(&mdsc->request_tree);
2f2dc053
SW		 2989
2990 dout("kick_requests mds%d\n", mds);
282c1052 2991 while (p) {
44ca18f2 2992 req = rb_entry(p, struct ceph_mds_request, r_node);
282c1052 2993 p = rb_next(p);
bc2de10d 2994 if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags))
44ca18f2 2995 continue;
3de22be6
YZ		 2996 if (req->r_attempts > 0)
2997 continue; /* only new requests */
44ca18f2
SW		 2998 if (req->r_session &&
2999 req->r_session->s_mds == mds) {
3000 dout(" kicking tid %llu\n", req->r_tid);
03974e81 3001 list_del_init(&req->r_wait);
44ca18f2 3002 __do_request(mdsc, req);
2f2dc053
SW		 3003 }
3004 }
3005}
3006
86bda539 3007int ceph_mdsc_submit_request(struct ceph_mds_client *mdsc, struct inode *dir,
2f2dc053
SW		 3008 struct ceph_mds_request *req)
3009{
891f3f5a 3010 int err = 0;
86bda539
JL		 3011
3012 /* take CAP_PIN refs for r_inode, r_parent, r_old_dentry */
3013 if (req->r_inode)
3014 ceph_get_cap_refs(ceph_inode(req->r_inode), CEPH_CAP_PIN);
9c1c2b35 3015 if (req->r_parent) {
719a2514
YZ		 3016 struct ceph_inode_info *ci = ceph_inode(req->r_parent);
3017 int fmode = (req->r_op & CEPH_MDS_OP_WRITE) ?
3018 CEPH_FILE_MODE_WR : CEPH_FILE_MODE_RD;
3019 spin_lock(&ci->i_ceph_lock);
3020 ceph_take_cap_refs(ci, CEPH_CAP_PIN, false);
3021 __ceph_touch_fmode(ci, mdsc, fmode);
3022 spin_unlock(&ci->i_ceph_lock);
9c1c2b35 3023 }
86bda539
JL		 3024 if (req->r_old_dentry_dir)
3025 ceph_get_cap_refs(ceph_inode(req->r_old_dentry_dir),
3026 CEPH_CAP_PIN);
3027
891f3f5a
JL		 3028 if (req->r_inode) {
3029 err = ceph_wait_on_async_create(req->r_inode);
3030 if (err) {
3031 dout("%s: wait for async create returned: %d\n",
3032 __func__, err);
3033 return err;
3034 }
3035 }
3036
3037 if (!err && req->r_old_inode) {
3038 err = ceph_wait_on_async_create(req->r_old_inode);
3039 if (err) {
3040 dout("%s: wait for async create returned: %d\n",
3041 __func__, err);
3042 return err;
3043 }
3044 }
3045
86bda539 3046 dout("submit_request on %p for inode %p\n", req, dir);
2f2dc053 3047 mutex_lock(&mdsc->mutex);
86bda539 3048 __register_request(mdsc, req, dir);
2f2dc053 3049 __do_request(mdsc, req);
86bda539 3050 err = req->r_err;
2f2dc053 3051 mutex_unlock(&mdsc->mutex);
86bda539 3052 return err;
2f2dc053
SW		 3053}
3054
8340f22c
JL		 3055static int ceph_mdsc_wait_request(struct ceph_mds_client *mdsc,
3056 struct ceph_mds_request *req)
2f2dc053
SW		 3057{
3058 int err;
3059
e1518c7c 3060 /* wait */
e1518c7c 3061 dout("do_request waiting\n");
5be73034 3062 if (!req->r_timeout && req->r_wait_for_completion) {
9280be24 3063 err = req->r_wait_for_completion(mdsc, req);
e1518c7c 3064 } else {
5be73034
ID		 3065 long timeleft = wait_for_completion_killable_timeout(
3066 &req->r_completion,
3067 ceph_timeout_jiffies(req->r_timeout));
3068 if (timeleft > 0)
3069 err = 0;
3070 else if (!timeleft)
8ccf7fcc 3071 err = -ETIMEDOUT; /* timed out */
5be73034
ID		 3072 else
3073 err = timeleft; /* killed */
e1518c7c
SW		 3074 }
3075 dout("do_request waited, got %d\n", err);
3076 mutex_lock(&mdsc->mutex);
5b1daecd 3077
e1518c7c 3078 /* only abort if we didn't race with a real reply */
bc2de10d 3079 if (test_bit(CEPH_MDS_R_GOT_RESULT, &req->r_req_flags)) {
e1518c7c
SW		 3080 err = le32_to_cpu(req->r_reply_info.head->result);
3081 } else if (err < 0) {
3082 dout("aborted request %lld with %d\n", req->r_tid, err);
b4556396
SW		 3083
3084 /*
3085 * ensure we aren't running concurrently with
3086 * ceph_fill_trace or ceph_readdir_prepopulate, which
3087 * rely on locks (dir mutex) held by our caller.
3088 */
3089 mutex_lock(&req->r_fill_mutex);
e1518c7c 3090 req->r_err = err;
bc2de10d 3091 set_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags);
b4556396 3092 mutex_unlock(&req->r_fill_mutex);
5b1daecd 3093
3dd69aab 3094 if (req->r_parent &&
167c9e35
SW		 3095 (req->r_op & CEPH_MDS_OP_WRITE))
3096 ceph_invalidate_dir_request(req);
2f2dc053 3097 } else {
e1518c7c 3098 err = req->r_err;
2f2dc053 3099 }
2f2dc053 3100
e1518c7c 3101 mutex_unlock(&mdsc->mutex);
8340f22c
JL		 3102 return err;
3103}
3104
3105/*
3106 * Synchrously perform an mds request. Take care of all of the
3107 * session setup, forwarding, retry details.
3108 */
3109int ceph_mdsc_do_request(struct ceph_mds_client *mdsc,
3110 struct inode *dir,
3111 struct ceph_mds_request *req)
3112{
3113 int err;
3114
3115 dout("do_request on %p\n", req);
3116
3117 /* issue */
3118 err = ceph_mdsc_submit_request(mdsc, dir, req);
3119 if (!err)
3120 err = ceph_mdsc_wait_request(mdsc, req);
2f2dc053
SW		 3121 dout("do_request %p done, result %d\n", req, err);
3122 return err;
3123}
3124
167c9e35 3125/*
2f276c51 3126 * Invalidate dir's completeness, dentry lease state on an aborted MDS
167c9e35
SW		 3127 * namespace request.
3128 */
3129void ceph_invalidate_dir_request(struct ceph_mds_request *req)
3130{
8d8f371c
YZ		 3131 struct inode *dir = req->r_parent;
3132 struct inode *old_dir = req->r_old_dentry_dir;
167c9e35 3133
8d8f371c 3134 dout("invalidate_dir_request %p %p (complete, lease(s))\n", dir, old_dir);
167c9e35 3135
8d8f371c
YZ		 3136 ceph_dir_clear_complete(dir);
3137 if (old_dir)
3138 ceph_dir_clear_complete(old_dir);
167c9e35
SW		 3139 if (req->r_dentry)
3140 ceph_invalidate_dentry_lease(req->r_dentry);
3141 if (req->r_old_dentry)
3142 ceph_invalidate_dentry_lease(req->r_old_dentry);
3143}
3144
2f2dc053
SW		 3145/*
3146 * Handle mds reply.
3147 *
3148 * We take the session mutex and parse and process the reply immediately.
3149 * This preserves the logical ordering of replies, capabilities, etc., sent
3150 * by the MDS as they are applied to our local cache.
3151 */
3152static void handle_reply(struct ceph_mds_session *session, struct ceph_msg *msg)
3153{
3154 struct ceph_mds_client *mdsc = session->s_mdsc;
3155 struct ceph_mds_request *req;
3156 struct ceph_mds_reply_head *head = msg->front.iov_base;
3157 struct ceph_mds_reply_info_parsed *rinfo; /* parsed reply info */
982d6011 3158 struct ceph_snap_realm *realm;
2f2dc053
SW		 3159 u64 tid;
3160 int err, result;
2600d2dd 3161 int mds = session->s_mds;
2f2dc053 3162
2f2dc053
SW		 3163 if (msg->front.iov_len < sizeof(*head)) {
3164 pr_err("mdsc_handle_reply got corrupt (short) reply\n");
9ec7cab1 3165 ceph_msg_dump(msg);
2f2dc053
SW		 3166 return;
3167 }
3168
3169 /* get request, session */
6df058c0 3170 tid = le64_to_cpu(msg->hdr.tid);
2f2dc053 3171 mutex_lock(&mdsc->mutex);
fcd00b68 3172 req = lookup_get_request(mdsc, tid);
2f2dc053
SW		 3173 if (!req) {
3174 dout("handle_reply on unknown tid %llu\n", tid);
3175 mutex_unlock(&mdsc->mutex);
3176 return;
3177 }
3178 dout("handle_reply %p\n", req);
2f2dc053
SW		 3179
3180 /* correct session? */
d96d6049 3181 if (req->r_session != session) {
2f2dc053
SW		 3182 pr_err("mdsc_handle_reply got %llu on session mds%d"
3183 " not mds%d\n", tid, session->s_mds,
3184 req->r_session ? req->r_session->s_mds : -1);
3185 mutex_unlock(&mdsc->mutex);
3186 goto out;
3187 }
3188
3189 /* dup? */
bc2de10d
JL		 3190 if ((test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags) && !head->safe) ||
3191 (test_bit(CEPH_MDS_R_GOT_SAFE, &req->r_req_flags) && head->safe)) {
f3ae1b97 3192 pr_warn("got a dup %s reply on %llu from mds%d\n",
2f2dc053
SW		 3193 head->safe ? "safe" : "unsafe", tid, mds);
3194 mutex_unlock(&mdsc->mutex);
3195 goto out;
3196 }
bc2de10d 3197 if (test_bit(CEPH_MDS_R_GOT_SAFE, &req->r_req_flags)) {
f3ae1b97 3198 pr_warn("got unsafe after safe on %llu from mds%d\n",
85792d0d
SW		 3199 tid, mds);
3200 mutex_unlock(&mdsc->mutex);
3201 goto out;
3202 }
2f2dc053
SW		 3203
3204 result = le32_to_cpu(head->result);
3205
3206 /*
e55b71f8
GF		 3207 * Handle an ESTALE
3208 * if we're not talking to the authority, send to them
3209 * if the authority has changed while we weren't looking,
3210 * send to new authority
3211 * Otherwise we just have to return an ESTALE
2f2dc053
SW		 3212 */
3213 if (result == -ESTALE) {
4c069a58 3214 dout("got ESTALE on request %llu\n", req->r_tid);
51da8e8c 3215 req->r_resend_mds = -1;
ca18bede 3216 if (req->r_direct_mode != USE_AUTH_MDS) {
4c069a58 3217 dout("not using auth, setting for that now\n");
e55b71f8 3218 req->r_direct_mode = USE_AUTH_MDS;
2f2dc053
SW		 3219 __do_request(mdsc, req);
3220 mutex_unlock(&mdsc->mutex);
3221 goto out;
e55b71f8 3222 } else {
c4853e97 3223 int mds = __choose_mds(mdsc, req, NULL);
ca18bede 3224 if (mds >= 0 && mds != req->r_session->s_mds) {
4c069a58 3225 dout("but auth changed, so resending\n");
e55b71f8
GF		 3226 __do_request(mdsc, req);
3227 mutex_unlock(&mdsc->mutex);
3228 goto out;
3229 }
2f2dc053 3230 }
4c069a58 3231 dout("have to return ESTALE on request %llu\n", req->r_tid);
2f2dc053
SW		 3232 }
3233
e55b71f8 3234
2f2dc053 3235 if (head->safe) {
bc2de10d 3236 set_bit(CEPH_MDS_R_GOT_SAFE, &req->r_req_flags);
2f2dc053 3237 __unregister_request(mdsc, req);
2f2dc053 3238
07edc057
XL		 3239 /* last request during umount? */
3240 if (mdsc->stopping && !__get_oldest_req(mdsc))
3241 complete_all(&mdsc->safe_umount_waiters);
3242
bc2de10d 3243 if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) {
2f2dc053
SW		 3244 /*
3245 * We already handled the unsafe response, now do the
3246 * cleanup. No need to examine the response; the MDS
3247 * doesn't include any result info in the safe
3248 * response. And even if it did, there is nothing
3249 * useful we could do with a revised return value.
3250 */
3251 dout("got safe reply %llu, mds%d\n", tid, mds);
2f2dc053 3252
2f2dc053
SW		 3253 mutex_unlock(&mdsc->mutex);
3254 goto out;
3255 }
e1518c7c 3256 } else {
bc2de10d 3257 set_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags);
2f2dc053
SW		 3258 list_add_tail(&req->r_unsafe_item, &req->r_session->s_unsafe);
3259 }
3260
3261 dout("handle_reply tid %lld result %d\n", tid, result);
3262 rinfo = &req->r_reply_info;
b37fe1f9 3263 if (test_bit(CEPHFS_FEATURE_REPLY_ENCODING, &session->s_features))
d4846487 3264 err = parse_reply_info(session, msg, rinfo, (u64)-1);
b37fe1f9 3265 else
d4846487 3266 err = parse_reply_info(session, msg, rinfo, session->s_con.peer_features);
2f2dc053
SW		 3267 mutex_unlock(&mdsc->mutex);
3268
bca9fc14
JL		 3269 /* Must find target inode outside of mutexes to avoid deadlocks */
3270 if ((err >= 0) && rinfo->head->is_target) {
3271 struct inode *in;
3272 struct ceph_vino tvino = {
3273 .ino = le64_to_cpu(rinfo->targeti.in->ino),
3274 .snap = le64_to_cpu(rinfo->targeti.in->snapid)
3275 };
3276
3277 in = ceph_get_inode(mdsc->fsc->sb, tvino);
3278 if (IS_ERR(in)) {
3279 err = PTR_ERR(in);
3280 mutex_lock(&session->s_mutex);
3281 goto out_err;
3282 }
3283 req->r_target_inode = in;
3284 }
3285
2f2dc053
SW		 3286 mutex_lock(&session->s_mutex);
3287 if (err < 0) {
25933abd 3288 pr_err("mdsc_handle_reply got corrupt reply mds%d(tid:%lld)\n", mds, tid);
9ec7cab1 3289 ceph_msg_dump(msg);
2f2dc053
SW		 3290 goto out_err;
3291 }
3292
3293 /* snap trace */
982d6011 3294 realm = NULL;
2f2dc053
SW		 3295 if (rinfo->snapblob_len) {
3296 down_write(&mdsc->snap_rwsem);
3297 ceph_update_snap_trace(mdsc, rinfo->snapblob,
982d6011
YZ		 3298 rinfo->snapblob + rinfo->snapblob_len,
3299 le32_to_cpu(head->op) == CEPH_MDS_OP_RMSNAP,
3300 &realm);
2f2dc053
SW		 3301 downgrade_write(&mdsc->snap_rwsem);
3302 } else {
3303 down_read(&mdsc->snap_rwsem);
3304 }
3305
3306 /* insert trace into our cache */
b4556396 3307 mutex_lock(&req->r_fill_mutex);
315f2408 3308 current->journal_info = req;
f5a03b08 3309 err = ceph_fill_trace(mdsc->fsc->sb, req);
2f2dc053 3310 if (err == 0) {
6e8575fa 3311 if (result == 0 && (req->r_op == CEPH_MDS_OP_READDIR ||
81c6aea5 3312 req->r_op == CEPH_MDS_OP_LSSNAP))
2f2dc053 3313 ceph_readdir_prepopulate(req, req->r_session);
2f2dc053 3314 }
315f2408 3315 current->journal_info = NULL;
b4556396 3316 mutex_unlock(&req->r_fill_mutex);
2f2dc053
SW		 3317
3318 up_read(&mdsc->snap_rwsem);
982d6011
YZ		 3319 if (realm)
3320 ceph_put_snap_realm(mdsc, realm);
68cd5b4b 3321
fe33032d
YZ		 3322 if (err == 0) {
3323 if (req->r_target_inode &&
3324 test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) {
3325 struct ceph_inode_info *ci =
3326 ceph_inode(req->r_target_inode);
3327 spin_lock(&ci->i_unsafe_lock);
3328 list_add_tail(&req->r_unsafe_target_item,
3329 &ci->i_unsafe_iops);
3330 spin_unlock(&ci->i_unsafe_lock);
3331 }
3332
3333 ceph_unreserve_caps(mdsc, &req->r_caps_reservation);
68cd5b4b 3334 }
2f2dc053 3335out_err:
e1518c7c 3336 mutex_lock(&mdsc->mutex);
bc2de10d 3337 if (!test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags)) {
e1518c7c
SW		 3338 if (err) {
3339 req->r_err = err;
3340 } else {
5fdb1389 3341 req->r_reply = ceph_msg_get(msg);
bc2de10d 3342 set_bit(CEPH_MDS_R_GOT_RESULT, &req->r_req_flags);
e1518c7c 3343 }
2f2dc053 3344 } else {
e1518c7c 3345 dout("reply arrived after request %lld was aborted\n", tid);
2f2dc053 3346 }
e1518c7c 3347 mutex_unlock(&mdsc->mutex);
2f2dc053 3348
2f2dc053
SW		 3349 mutex_unlock(&session->s_mutex);
3350
3351 /* kick calling process */
3352 complete_request(mdsc, req);
70c94820 3353
8ae99ae2 3354 ceph_update_metadata_metrics(&mdsc->metric, req->r_start_latency,
70c94820 3355 req->r_end_latency, err);
2f2dc053
SW		 3356out:
3357 ceph_mdsc_put_request(req);
3358 return;
3359}
3360
3361
3362
3363/*
3364 * handle mds notification that our request has been forwarded.
3365 */
2600d2dd
SW		 3366static void handle_forward(struct ceph_mds_client *mdsc,
3367 struct ceph_mds_session *session,
3368 struct ceph_msg *msg)
2f2dc053
SW		 3369{
3370 struct ceph_mds_request *req;
a1ea787c 3371 u64 tid = le64_to_cpu(msg->hdr.tid);
2f2dc053
SW		 3372 u32 next_mds;
3373 u32 fwd_seq;
2f2dc053
SW		 3374 int err = -EINVAL;
3375 void *p = msg->front.iov_base;
3376 void *end = p + msg->front.iov_len;
2f2dc053 3377
a1ea787c 3378 ceph_decode_need(&p, end, 2*sizeof(u32), bad);
c89136ea
SW		 3379 next_mds = ceph_decode_32(&p);
3380 fwd_seq = ceph_decode_32(&p);
2f2dc053
SW		 3381
3382 mutex_lock(&mdsc->mutex);
fcd00b68 3383 req = lookup_get_request(mdsc, tid);
2f2dc053 3384 if (!req) {
2a8e5e36 3385 dout("forward tid %llu to mds%d - req dne\n", tid, next_mds);
2f2dc053
SW		 3386 goto out; /* dup reply? */
3387 }
3388
bc2de10d 3389 if (test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags)) {
2a8e5e36
SW		 3390 dout("forward tid %llu aborted, unregistering\n", tid);
3391 __unregister_request(mdsc, req);
3392 } else if (fwd_seq <= req->r_num_fwd) {
3393 dout("forward tid %llu to mds%d - old seq %d <= %d\n",
2f2dc053
SW		 3394 tid, next_mds, req->r_num_fwd, fwd_seq);
3395 } else {
3396 /* resend. forward race not possible; mds would drop */
2a8e5e36
SW		 3397 dout("forward tid %llu to mds%d (we resend)\n", tid, next_mds);
3398 BUG_ON(req->r_err);
bc2de10d 3399 BUG_ON(test_bit(CEPH_MDS_R_GOT_RESULT, &req->r_req_flags));
3de22be6 3400 req->r_attempts = 0;
2f2dc053
SW		 3401 req->r_num_fwd = fwd_seq;
3402 req->r_resend_mds = next_mds;
3403 put_request_session(req);
3404 __do_request(mdsc, req);
3405 }
3406 ceph_mdsc_put_request(req);
3407out:
3408 mutex_unlock(&mdsc->mutex);
3409 return;
3410
3411bad:
3412 pr_err("mdsc_handle_forward decode error err=%d\n", err);
3413}
3414
131d7eb4 3415static int __decode_session_metadata(void **p, void *end,
0b98acd6 3416 bool *blocklisted)
84bf3950
YZ		 3417{
3418 /* map<string,string> */
3419 u32 n;
131d7eb4 3420 bool err_str;
84bf3950
YZ		 3421 ceph_decode_32_safe(p, end, n, bad);
3422 while (n-- > 0) {
3423 u32 len;
3424 ceph_decode_32_safe(p, end, len, bad);
3425 ceph_decode_need(p, end, len, bad);
131d7eb4 3426 err_str = !strncmp(*p, "error_string", len);
84bf3950
YZ		 3427 *p += len;
3428 ceph_decode_32_safe(p, end, len, bad);
3429 ceph_decode_need(p, end, len, bad);
4bb926e8
ID		 3430 /*
3431 * Match "blocklisted (blacklisted)" from newer MDSes,
3432 * or "blacklisted" from older MDSes.
3433 */
131d7eb4 3434 if (err_str && strnstr(*p, "blacklisted", len))
0b98acd6 3435 *blocklisted = true;
84bf3950
YZ		 3436 *p += len;
3437 }
3438 return 0;
3439bad:
3440 return -1;
3441}
3442
2f2dc053
SW		 3443/*
3444 * handle a mds session control message
3445 */
3446static void handle_session(struct ceph_mds_session *session,
3447 struct ceph_msg *msg)
3448{
3449 struct ceph_mds_client *mdsc = session->s_mdsc;
84bf3950
YZ		 3450 int mds = session->s_mds;
3451 int msg_version = le16_to_cpu(msg->hdr.version);
3452 void *p = msg->front.iov_base;
3453 void *end = p + msg->front.iov_len;
3454 struct ceph_mds_session_head *h;
2f2dc053 3455 u32 op;
0fa82633 3456 u64 seq, features = 0;
2f2dc053 3457 int wake = 0;
0b98acd6 3458 bool blocklisted = false;
2f2dc053 3459
2f2dc053 3460 /* decode */
84bf3950
YZ		 3461 ceph_decode_need(&p, end, sizeof(*h), bad);
3462 h = p;
3463 p += sizeof(*h);
3464
2f2dc053
SW		 3465 op = le32_to_cpu(h->op);
3466 seq = le64_to_cpu(h->seq);
3467
84bf3950
YZ		 3468 if (msg_version >= 3) {
3469 u32 len;
3470 /* version >= 2, metadata */
0b98acd6 3471 if (__decode_session_metadata(&p, end, &blocklisted) < 0)
84bf3950
YZ		 3472 goto bad;
3473 /* version >= 3, feature bits */
3474 ceph_decode_32_safe(&p, end, len, bad);
02e37571
JL		 3475 if (len) {
3476 ceph_decode_64_safe(&p, end, features, bad);
3477 p += len - sizeof(features);
3478 }
84bf3950
YZ		 3479 }
3480
2f2dc053 3481 mutex_lock(&mdsc->mutex);
0a07fc8c 3482 if (op == CEPH_SESSION_CLOSE) {
5b3248c6 3483 ceph_get_mds_session(session);
2600d2dd 3484 __unregister_session(mdsc, session);
0a07fc8c 3485 }
2f2dc053
SW		 3486 /* FIXME: this ttl calculation is generous */
3487 session->s_ttl = jiffies + HZ*mdsc->mdsmap->m_session_autoclose;
3488 mutex_unlock(&mdsc->mutex);
3489
3490 mutex_lock(&session->s_mutex);
3491
3492 dout("handle_session mds%d %s %p state %s seq %llu\n",
3493 mds, ceph_session_op_name(op), session,
a687ecaf 3494 ceph_session_state_name(session->s_state), seq);
2f2dc053
SW		 3495
3496 if (session->s_state == CEPH_MDS_SESSION_HUNG) {
3497 session->s_state = CEPH_MDS_SESSION_OPEN;
3498 pr_info("mds%d came back\n", session->s_mds);
3499 }
3500
3501 switch (op) {
3502 case CEPH_SESSION_OPEN:
29790f26
SW		 3503 if (session->s_state == CEPH_MDS_SESSION_RECONNECTING)
3504 pr_info("mds%d reconnect success\n", session->s_mds);
2f2dc053 3505 session->s_state = CEPH_MDS_SESSION_OPEN;
84bf3950 3506 session->s_features = features;
2f2dc053 3507 renewed_caps(mdsc, session, 0);
18f473b3
XL		 3508 if (test_bit(CEPHFS_FEATURE_METRIC_COLLECT, &session->s_features))
3509 metric_schedule_delayed(&mdsc->metric);
2f2dc053
SW		 3510 wake = 1;
3511 if (mdsc->stopping)
3512 __close_session(mdsc, session);
3513 break;
3514
3515 case CEPH_SESSION_RENEWCAPS:
3516 if (session->s_renew_seq == seq)
3517 renewed_caps(mdsc, session, 1);
3518 break;
3519
3520 case CEPH_SESSION_CLOSE:
29790f26
SW		 3521 if (session->s_state == CEPH_MDS_SESSION_RECONNECTING)
3522 pr_info("mds%d reconnect denied\n", session->s_mds);
4d681c2f 3523 session->s_state = CEPH_MDS_SESSION_CLOSED;
1c841a96 3524 cleanup_session_requests(mdsc, session);
2f2dc053 3525 remove_session_caps(session);
656e4382 3526 wake = 2; /* for good measure */
f3c60c59 3527 wake_up_all(&mdsc->session_close_wq);
2f2dc053
SW		 3528 break;
3529
3530 case CEPH_SESSION_STALE:
3531 pr_info("mds%d caps went stale, renewing\n",
3532 session->s_mds);
52d60f8e 3533 atomic_inc(&session->s_cap_gen);
1ce208a6 3534 session->s_cap_ttl = jiffies - 1;
2f2dc053
SW		 3535 send_renew_caps(mdsc, session);
3536 break;
3537
3538 case CEPH_SESSION_RECALL_STATE:
e30ee581 3539 ceph_trim_caps(mdsc, session, le32_to_cpu(h->max_caps));
2f2dc053
SW		 3540 break;
3541
186e4f7a
YZ		 3542 case CEPH_SESSION_FLUSHMSG:
3543 send_flushmsg_ack(mdsc, session, seq);
3544 break;
3545
03f4fcb0
YZ		 3546 case CEPH_SESSION_FORCE_RO:
3547 dout("force_session_readonly %p\n", session);
3548 spin_lock(&session->s_cap_lock);
3549 session->s_readonly = true;
3550 spin_unlock(&session->s_cap_lock);
d2f8bb27 3551 wake_up_session_caps(session, FORCE_RO);
03f4fcb0
YZ		 3552 break;
3553
fcff415c
YZ		 3554 case CEPH_SESSION_REJECT:
3555 WARN_ON(session->s_state != CEPH_MDS_SESSION_OPENING);
3556 pr_info("mds%d rejected session\n", session->s_mds);
3557 session->s_state = CEPH_MDS_SESSION_REJECTED;
3558 cleanup_session_requests(mdsc, session);
3559 remove_session_caps(session);
0b98acd6
ID		 3560 if (blocklisted)
3561 mdsc->fsc->blocklisted = true;
fcff415c
YZ		 3562 wake = 2; /* for good measure */
3563 break;
3564
2f2dc053
SW		 3565 default:
3566 pr_err("mdsc_handle_session bad op %d mds%d\n", op, mds);
3567 WARN_ON(1);
3568 }
3569
3570 mutex_unlock(&session->s_mutex);
3571 if (wake) {
3572 mutex_lock(&mdsc->mutex);
3573 __wake_requests(mdsc, &session->s_waiting);
656e4382
YZ		 3574 if (wake == 2)
3575 kick_requests(mdsc, mds);
2f2dc053
SW		 3576 mutex_unlock(&mdsc->mutex);
3577 }
0a07fc8c
YZ		 3578 if (op == CEPH_SESSION_CLOSE)
3579 ceph_put_mds_session(session);
2f2dc053
SW		 3580 return;
3581
3582bad:
3583 pr_err("mdsc_handle_session corrupt message mds%d len %d\n", mds,
3584 (int)msg->front.iov_len);
9ec7cab1 3585 ceph_msg_dump(msg);
2f2dc053
SW		 3586 return;
3587}
3588
a25949b9
JL		 3589void ceph_mdsc_release_dir_caps(struct ceph_mds_request *req)
3590{
3591 int dcaps;
3592
3593 dcaps = xchg(&req->r_dir_caps, 0);
3594 if (dcaps) {
3595 dout("releasing r_dir_caps=%s\n", ceph_cap_string(dcaps));
3596 ceph_put_cap_refs(ceph_inode(req->r_parent), dcaps);
3597 }
3598}
3599
e64f44a8
XL		 3600void ceph_mdsc_release_dir_caps_no_check(struct ceph_mds_request *req)
3601{
3602 int dcaps;
3603
3604 dcaps = xchg(&req->r_dir_caps, 0);
3605 if (dcaps) {
3606 dout("releasing r_dir_caps=%s\n", ceph_cap_string(dcaps));
3607 ceph_put_cap_refs_no_check_caps(ceph_inode(req->r_parent),
3608 dcaps);
3609 }
3610}
3611
2f2dc053
SW		 3612/*
3613 * called under session->mutex.
3614 */
3615static void replay_unsafe_requests(struct ceph_mds_client *mdsc,
3616 struct ceph_mds_session *session)
3617{
3618 struct ceph_mds_request *req, *nreq;
3de22be6 3619 struct rb_node *p;
2f2dc053
SW		 3620
3621 dout("replay_unsafe_requests mds%d\n", session->s_mds);
3622
3623 mutex_lock(&mdsc->mutex);
9cf54563 3624 list_for_each_entry_safe(req, nreq, &session->s_unsafe, r_unsafe_item)
396bd62c 3625 __send_request(session, req, true);
3de22be6
YZ		 3626
3627 /*
3628 * also re-send old requests when MDS enters reconnect stage. So that MDS
3629 * can process completed request in clientreplay stage.
3630 */
3631 p = rb_first(&mdsc->request_tree);
3632 while (p) {
3633 req = rb_entry(p, struct ceph_mds_request, r_node);
3634 p = rb_next(p);
bc2de10d 3635 if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags))
3de22be6
YZ		 3636 continue;
3637 if (req->r_attempts == 0)
3638 continue; /* only old requests */
a25949b9
JL		 3639 if (!req->r_session)
3640 continue;
3641 if (req->r_session->s_mds != session->s_mds)
3642 continue;
3643
e64f44a8 3644 ceph_mdsc_release_dir_caps_no_check(req);
a25949b9 3645
396bd62c 3646 __send_request(session, req, true);
3de22be6 3647 }
2f2dc053
SW		 3648 mutex_unlock(&mdsc->mutex);
3649}
3650
81c5a148
YZ		 3651static int send_reconnect_partial(struct ceph_reconnect_state *recon_state)
3652{
3653 struct ceph_msg *reply;
3654 struct ceph_pagelist *_pagelist;
3655 struct page *page;
3656 __le32 *addr;
3657 int err = -ENOMEM;
3658
3659 if (!recon_state->allow_multi)
3660 return -ENOSPC;
3661
3662 /* can't handle message that contains both caps and realm */
3663 BUG_ON(!recon_state->nr_caps == !recon_state->nr_realms);
3664
3665 /* pre-allocate new pagelist */
3666 _pagelist = ceph_pagelist_alloc(GFP_NOFS);
3667 if (!_pagelist)
3668 return -ENOMEM;
3669
3670 reply = ceph_msg_new2(CEPH_MSG_CLIENT_RECONNECT, 0, 1, GFP_NOFS, false);
3671 if (!reply)
3672 goto fail_msg;
3673
3674 /* placeholder for nr_caps */
3675 err = ceph_pagelist_encode_32(_pagelist, 0);
3676 if (err < 0)
3677 goto fail;
3678
3679 if (recon_state->nr_caps) {
3680 /* currently encoding caps */
3681 err = ceph_pagelist_encode_32(recon_state->pagelist, 0);
3682 if (err)
3683 goto fail;
3684 } else {
3685 /* placeholder for nr_realms (currently encoding relams) */
3686 err = ceph_pagelist_encode_32(_pagelist, 0);
3687 if (err < 0)
3688 goto fail;
3689 }
3690
3691 err = ceph_pagelist_encode_8(recon_state->pagelist, 1);
3692 if (err)
3693 goto fail;
3694
3695 page = list_first_entry(&recon_state->pagelist->head, struct page, lru);
3696 addr = kmap_atomic(page);
3697 if (recon_state->nr_caps) {
3698 /* currently encoding caps */
3699 *addr = cpu_to_le32(recon_state->nr_caps);
3700 } else {
3701 /* currently encoding relams */
3702 *(addr + 1) = cpu_to_le32(recon_state->nr_realms);
3703 }
3704 kunmap_atomic(addr);
3705
3706 reply->hdr.version = cpu_to_le16(5);
3707 reply->hdr.compat_version = cpu_to_le16(4);
3708
3709 reply->hdr.data_len = cpu_to_le32(recon_state->pagelist->length);
3710 ceph_msg_data_add_pagelist(reply, recon_state->pagelist);
3711
3712 ceph_con_send(&recon_state->session->s_con, reply);
3713 ceph_pagelist_release(recon_state->pagelist);
3714
3715 recon_state->pagelist = _pagelist;
3716 recon_state->nr_caps = 0;
3717 recon_state->nr_realms = 0;
3718 recon_state->msg_version = 5;
3719 return 0;
3720fail:
3721 ceph_msg_put(reply);
3722fail_msg:
3723 ceph_pagelist_release(_pagelist);
3724 return err;
3725}
3726
a33f6432
YZ		 3727static struct dentry* d_find_primary(struct inode *inode)
3728{
3729 struct dentry *alias, *dn = NULL;
3730
3731 if (hlist_empty(&inode->i_dentry))
3732 return NULL;
3733
3734 spin_lock(&inode->i_lock);
3735 if (hlist_empty(&inode->i_dentry))
3736 goto out_unlock;
3737
3738 if (S_ISDIR(inode->i_mode)) {
3739 alias = hlist_entry(inode->i_dentry.first, struct dentry, d_u.d_alias);
3740 if (!IS_ROOT(alias))
3741 dn = dget(alias);
3742 goto out_unlock;
3743 }
3744
3745 hlist_for_each_entry(alias, &inode->i_dentry, d_u.d_alias) {
3746 spin_lock(&alias->d_lock);
3747 if (!d_unhashed(alias) &&
3748 (ceph_dentry(alias)->flags & CEPH_DENTRY_PRIMARY_LINK)) {
3749 dn = dget_dlock(alias);
3750 }
3751 spin_unlock(&alias->d_lock);
3752 if (dn)
3753 break;
3754 }
3755out_unlock:
3756 spin_unlock(&inode->i_lock);
3757 return dn;
3758}
3759
2f2dc053
SW		 3760/*
3761 * Encode information about a cap for a reconnect with the MDS.
3762 */
a25949b9 3763static int reconnect_caps_cb(struct inode *inode, struct ceph_cap *cap,
2f2dc053
SW		 3764 void *arg)
3765{
20cb34ae
SW		 3766 union {
3767 struct ceph_mds_cap_reconnect v2;
3768 struct ceph_mds_cap_reconnect_v1 v1;
3769 } rec;
b3f8d68f 3770 struct ceph_inode_info *ci = cap->ci;
20cb34ae
SW		 3771 struct ceph_reconnect_state *recon_state = arg;
3772 struct ceph_pagelist *pagelist = recon_state->pagelist;
a33f6432
YZ		 3773 struct dentry *dentry;
3774 char *path;
3775 int pathlen, err;
3776 u64 pathbase;
3469ed0d 3777 u64 snap_follows;
2f2dc053 3778
2f2dc053
SW		 3779 dout(" adding %p ino %llx.%llx cap %p %lld %s\n",
3780 inode, ceph_vinop(inode), cap, cap->cap_id,
3781 ceph_cap_string(cap->issued));
2f2dc053 3782
a33f6432
YZ		 3783 dentry = d_find_primary(inode);
3784 if (dentry) {
3785 /* set pathbase to parent dir when msg_version >= 2 */
3786 path = ceph_mdsc_build_path(dentry, &pathlen, &pathbase,
3787 recon_state->msg_version >= 2);
3788 dput(dentry);
3789 if (IS_ERR(path)) {
3790 err = PTR_ERR(path);
3791 goto out_err;
3792 }
3793 } else {
3794 path = NULL;
3795 pathlen = 0;
3796 pathbase = 0;
3797 }
3798
be655596 3799 spin_lock(&ci->i_ceph_lock);
2f2dc053
SW		 3800 cap->seq = 0; /* reset cap seq */
3801 cap->issue_seq = 0; /* and issue_seq */
667ca05c 3802 cap->mseq = 0; /* and migrate_seq */
52d60f8e 3803 cap->cap_gen = atomic_read(&cap->session->s_cap_gen);
20cb34ae 3804
a25949b9 3805 /* These are lost when the session goes away */
785892fe
JL		 3806 if (S_ISDIR(inode->i_mode)) {
3807 if (cap->issued & CEPH_CAP_DIR_CREATE) {
3808 ceph_put_string(rcu_dereference_raw(ci->i_cached_layout.pool_ns));
3809 memset(&ci->i_cached_layout, 0, sizeof(ci->i_cached_layout));
3810 }
a25949b9 3811 cap->issued &= ~CEPH_CAP_ANY_DIR_OPS;
785892fe 3812 }
a25949b9 3813
121f22a1 3814 if (recon_state->msg_version >= 2) {
20cb34ae
SW		 3815 rec.v2.cap_id = cpu_to_le64(cap->cap_id);
3816 rec.v2.wanted = cpu_to_le32(__ceph_caps_wanted(ci));
3817 rec.v2.issued = cpu_to_le32(cap->issued);
3818 rec.v2.snaprealm = cpu_to_le64(ci->i_snap_realm->ino);
a33f6432 3819 rec.v2.pathbase = cpu_to_le64(pathbase);
ec1dff25
JL		 3820 rec.v2.flock_len = (__force __le32)
3821 ((ci->i_ceph_flags & CEPH_I_ERROR_FILELOCK) ? 0 : 1);
20cb34ae
SW		 3822 } else {
3823 rec.v1.cap_id = cpu_to_le64(cap->cap_id);
3824 rec.v1.wanted = cpu_to_le32(__ceph_caps_wanted(ci));
3825 rec.v1.issued = cpu_to_le32(cap->issued);
2d6795fb 3826 rec.v1.size = cpu_to_le64(i_size_read(inode));
9bbeab41
AB		 3827 ceph_encode_timespec64(&rec.v1.mtime, &inode->i_mtime);
3828 ceph_encode_timespec64(&rec.v1.atime, &inode->i_atime);
20cb34ae 3829 rec.v1.snaprealm = cpu_to_le64(ci->i_snap_realm->ino);
a33f6432 3830 rec.v1.pathbase = cpu_to_le64(pathbase);
20cb34ae 3831 }
3469ed0d
YZ		 3832
3833 if (list_empty(&ci->i_cap_snaps)) {
92776fd2 3834 snap_follows = ci->i_head_snapc ? ci->i_head_snapc->seq : 0;
3469ed0d
YZ		 3835 } else {
3836 struct ceph_cap_snap *capsnap =
3837 list_first_entry(&ci->i_cap_snaps,
3838 struct ceph_cap_snap, ci_item);
3839 snap_follows = capsnap->follows;
20cb34ae 3840 }
be655596 3841 spin_unlock(&ci->i_ceph_lock);
2f2dc053 3842
121f22a1 3843 if (recon_state->msg_version >= 2) {
40819f6f 3844 int num_fcntl_locks, num_flock_locks;
4deb14a2 3845 struct ceph_filelock *flocks = NULL;
81c5a148 3846 size_t struct_len, total_len = sizeof(u64);
121f22a1 3847 u8 struct_v = 0;
39be95e9
JS		 3848
3849encode_again:
b3f8d68f
YZ		 3850 if (rec.v2.flock_len) {
3851 ceph_count_locks(inode, &num_fcntl_locks, &num_flock_locks);
3852 } else {
3853 num_fcntl_locks = 0;
3854 num_flock_locks = 0;
3855 }
4deb14a2 3856 if (num_fcntl_locks + num_flock_locks > 0) {
6da2ec56
KC		 3857 flocks = kmalloc_array(num_fcntl_locks + num_flock_locks,
3858 sizeof(struct ceph_filelock),
3859 GFP_NOFS);
4deb14a2
YZ		 3860 if (!flocks) {
3861 err = -ENOMEM;
5ccedf1c 3862 goto out_err;
4deb14a2
YZ		 3863 }
3864 err = ceph_encode_locks_to_buffer(inode, flocks,
3865 num_fcntl_locks,
3866 num_flock_locks);
3867 if (err) {
3868 kfree(flocks);
3869 flocks = NULL;
3870 if (err == -ENOSPC)
3871 goto encode_again;
5ccedf1c 3872 goto out_err;
4deb14a2
YZ		 3873 }
3874 } else {
39be95e9 3875 kfree(flocks);
4deb14a2 3876 flocks = NULL;
39be95e9 3877 }
121f22a1
YZ		 3878
3879 if (recon_state->msg_version >= 3) {
3880 /* version, compat_version and struct_len */
81c5a148 3881 total_len += 2 * sizeof(u8) + sizeof(u32);
3469ed0d 3882 struct_v = 2;
121f22a1 3883 }
39be95e9
JS		 3884 /*
3885 * number of encoded locks is stable, so copy to pagelist
3886 */
121f22a1
YZ		 3887 struct_len = 2 * sizeof(u32) +
3888 (num_fcntl_locks + num_flock_locks) *
3889 sizeof(struct ceph_filelock);
3890 rec.v2.flock_len = cpu_to_le32(struct_len);
3891
a33f6432 3892 struct_len += sizeof(u32) + pathlen + sizeof(rec.v2);
121f22a1 3893
3469ed0d
YZ		 3894 if (struct_v >= 2)
3895 struct_len += sizeof(u64); /* snap_follows */
3896
121f22a1 3897 total_len += struct_len;
81c5a148
YZ		 3898
3899 if (pagelist->length + total_len > RECONNECT_MAX_SIZE) {
3900 err = send_reconnect_partial(recon_state);
3901 if (err)
3902 goto out_freeflocks;
3903 pagelist = recon_state->pagelist;
5ccedf1c 3904 }
121f22a1 3905
81c5a148
YZ		 3906 err = ceph_pagelist_reserve(pagelist, total_len);
3907 if (err)
3908 goto out_freeflocks;
3909
3910 ceph_pagelist_encode_64(pagelist, ceph_ino(inode));
5ccedf1c
YZ		 3911 if (recon_state->msg_version >= 3) {
3912 ceph_pagelist_encode_8(pagelist, struct_v);
3913 ceph_pagelist_encode_8(pagelist, 1);
3914 ceph_pagelist_encode_32(pagelist, struct_len);
121f22a1 3915 }
a33f6432 3916 ceph_pagelist_encode_string(pagelist, path, pathlen);
5ccedf1c
YZ		 3917 ceph_pagelist_append(pagelist, &rec, sizeof(rec.v2));
3918 ceph_locks_to_pagelist(flocks, pagelist,
3919 num_fcntl_locks, num_flock_locks);
3920 if (struct_v >= 2)
3921 ceph_pagelist_encode_64(pagelist, snap_follows);
81c5a148 3922out_freeflocks:
39be95e9 3923 kfree(flocks);
3612abbd 3924 } else {
5ccedf1c 3925 err = ceph_pagelist_reserve(pagelist,
81c5a148
YZ		 3926 sizeof(u64) + sizeof(u32) +
3927 pathlen + sizeof(rec.v1));
a33f6432
YZ		 3928 if (err)
3929 goto out_err;
5ccedf1c 3930
81c5a148 3931 ceph_pagelist_encode_64(pagelist, ceph_ino(inode));
5ccedf1c
YZ		 3932 ceph_pagelist_encode_string(pagelist, path, pathlen);
3933 ceph_pagelist_append(pagelist, &rec, sizeof(rec.v1));
40819f6f 3934 }
44c99757 3935
5ccedf1c 3936out_err:
a33f6432
YZ		 3937 ceph_mdsc_free_path(path, pathlen);
3938 if (!err)
81c5a148
YZ		 3939 recon_state->nr_caps++;
3940 return err;
3941}
3942
3943static int encode_snap_realms(struct ceph_mds_client *mdsc,
3944 struct ceph_reconnect_state *recon_state)
3945{
3946 struct rb_node *p;
3947 struct ceph_pagelist *pagelist = recon_state->pagelist;
3948 int err = 0;
3949
3950 if (recon_state->msg_version >= 4) {
3951 err = ceph_pagelist_encode_32(pagelist, mdsc->num_snap_realms);
3952 if (err < 0)
3953 goto fail;
3954 }
3955
3956 /*
3957 * snaprealms. we provide mds with the ino, seq (version), and
3958 * parent for all of our realms. If the mds has any newer info,
3959 * it will tell us.
3960 */
3961 for (p = rb_first(&mdsc->snap_realms); p; p = rb_next(p)) {
3962 struct ceph_snap_realm *realm =
3963 rb_entry(p, struct ceph_snap_realm, node);
3964 struct ceph_mds_snaprealm_reconnect sr_rec;
3965
3966 if (recon_state->msg_version >= 4) {
3967 size_t need = sizeof(u8) * 2 + sizeof(u32) +
3968 sizeof(sr_rec);
3969
3970 if (pagelist->length + need > RECONNECT_MAX_SIZE) {
3971 err = send_reconnect_partial(recon_state);
3972 if (err)
3973 goto fail;
3974 pagelist = recon_state->pagelist;
3975 }
3976
3977 err = ceph_pagelist_reserve(pagelist, need);
3978 if (err)
3979 goto fail;
3980
3981 ceph_pagelist_encode_8(pagelist, 1);
3982 ceph_pagelist_encode_8(pagelist, 1);
3983 ceph_pagelist_encode_32(pagelist, sizeof(sr_rec));
3984 }
3985
3986 dout(" adding snap realm %llx seq %lld parent %llx\n",
3987 realm->ino, realm->seq, realm->parent_ino);
3988 sr_rec.ino = cpu_to_le64(realm->ino);
3989 sr_rec.seq = cpu_to_le64(realm->seq);
3990 sr_rec.parent = cpu_to_le64(realm->parent_ino);
3991
3992 err = ceph_pagelist_append(pagelist, &sr_rec, sizeof(sr_rec));
3993 if (err)
3994 goto fail;
3995
3996 recon_state->nr_realms++;
3997 }
3998fail:
93cea5be 3999 return err;
2f2dc053
SW		 4000}
4001
4002
4003/*
4004 * If an MDS fails and recovers, clients need to reconnect in order to
4005 * reestablish shared state. This includes all caps issued through
4006 * this session _and_ the snap_realm hierarchy. Because it's not
4007 * clear which snap realms the mds cares about, we send everything we
4008 * know about.. that ensures we'll then get any new info the
4009 * recovering MDS might have.
4010 *
4011 * This is a relatively heavyweight operation, but it's rare.
2f2dc053 4012 */
34b6c855
SW		 4013static void send_mds_reconnect(struct ceph_mds_client *mdsc,
4014 struct ceph_mds_session *session)
2f2dc053 4015{
2f2dc053 4016 struct ceph_msg *reply;
34b6c855 4017 int mds = session->s_mds;
9abf82b8 4018 int err = -ENOMEM;
81c5a148
YZ		 4019 struct ceph_reconnect_state recon_state = {
4020 .session = session,
4021 };
c8a96a31 4022 LIST_HEAD(dispose);
2f2dc053 4023
34b6c855 4024 pr_info("mds%d reconnect start\n", mds);
2f2dc053 4025
81c5a148
YZ		 4026 recon_state.pagelist = ceph_pagelist_alloc(GFP_NOFS);
4027 if (!recon_state.pagelist)
93cea5be 4028 goto fail_nopagelist;
93cea5be 4029
0d9c1ab3 4030 reply = ceph_msg_new2(CEPH_MSG_CLIENT_RECONNECT, 0, 1, GFP_NOFS, false);
a79832f2 4031 if (!reply)
93cea5be 4032 goto fail_nomsg;
93cea5be 4033
d4846487
JL		 4034 xa_destroy(&session->s_delegated_inos);
4035
34b6c855
SW		 4036 mutex_lock(&session->s_mutex);
4037 session->s_state = CEPH_MDS_SESSION_RECONNECTING;
4038 session->s_seq = 0;
2f2dc053 4039
2f2dc053 4040 dout("session %p state %s\n", session,
a687ecaf 4041 ceph_session_state_name(session->s_state));
2f2dc053 4042
52d60f8e 4043 atomic_inc(&session->s_cap_gen);
99a9c273
YZ		 4044
4045 spin_lock(&session->s_cap_lock);
03f4fcb0
YZ		 4046 /* don't know if session is readonly */
4047 session->s_readonly = 0;
99a9c273
YZ		 4048 /*
4049 * notify __ceph_remove_cap() that we are composing cap reconnect.
4050 * If a cap get released before being added to the cap reconnect,
4051 * __ceph_remove_cap() should skip queuing cap release.
4052 */
4053 session->s_cap_reconnect = 1;
e01a5946 4054 /* drop old cap expires; we're about to reestablish that state */
c8a96a31
JL		 4055 detach_cap_releases(session, &dispose);
4056 spin_unlock(&session->s_cap_lock);
4057 dispose_cap_releases(mdsc, &dispose);
e01a5946 4058
5d23371f 4059 /* trim unused caps to reduce MDS's cache rejoin time */
c0bd50e2
YZ		 4060 if (mdsc->fsc->sb->s_root)
4061 shrink_dcache_parent(mdsc->fsc->sb->s_root);
5d23371f
YZ		 4062
4063 ceph_con_close(&session->s_con);
4064 ceph_con_open(&session->s_con,
4065 CEPH_ENTITY_TYPE_MDS, mds,
4066 ceph_mdsmap_get_addr(mdsc->mdsmap, mds));
4067
4068 /* replay unsafe requests */
4069 replay_unsafe_requests(mdsc, session);
4070
81c5a148
YZ		 4071 ceph_early_kick_flushing_caps(mdsc, session);
4072
5d23371f
YZ		 4073 down_read(&mdsc->snap_rwsem);
4074
81c5a148
YZ		 4075 /* placeholder for nr_caps */
4076 err = ceph_pagelist_encode_32(recon_state.pagelist, 0);
93cea5be
SW		 4077 if (err)
4078 goto fail;
20cb34ae 4079
81c5a148 4080 if (test_bit(CEPHFS_FEATURE_MULTI_RECONNECT, &session->s_features)) {
121f22a1 4081 recon_state.msg_version = 3;
81c5a148
YZ		 4082 recon_state.allow_multi = true;
4083 } else if (session->s_con.peer_features & CEPH_FEATURE_MDSENC) {
4084 recon_state.msg_version = 3;
4085 } else {
23c625ce 4086 recon_state.msg_version = 2;
81c5a148
YZ		 4087 }
4088 /* trsaverse this session's caps */
a25949b9 4089 err = ceph_iterate_session_caps(session, reconnect_caps_cb, &recon_state);
2f2dc053 4090
99a9c273
YZ		 4091 spin_lock(&session->s_cap_lock);
4092 session->s_cap_reconnect = 0;
4093 spin_unlock(&session->s_cap_lock);
4094
81c5a148
YZ		 4095 if (err < 0)
4096 goto fail;
2f2dc053 4097
81c5a148
YZ		 4098 /* check if all realms can be encoded into current message */
4099 if (mdsc->num_snap_realms) {
4100 size_t total_len =
4101 recon_state.pagelist->length +
4102 mdsc->num_snap_realms *
4103 sizeof(struct ceph_mds_snaprealm_reconnect);
4104 if (recon_state.msg_version >= 4) {
4105 /* number of realms */
4106 total_len += sizeof(u32);
4107 /* version, compat_version and struct_len */
4108 total_len += mdsc->num_snap_realms *
4109 (2 * sizeof(u8) + sizeof(u32));
4110 }
4111 if (total_len > RECONNECT_MAX_SIZE) {
4112 if (!recon_state.allow_multi) {
4113 err = -ENOSPC;
4114 goto fail;
4115 }
4116 if (recon_state.nr_caps) {
4117 err = send_reconnect_partial(&recon_state);
4118 if (err)
4119 goto fail;
4120 }
4121 recon_state.msg_version = 5;
4122 }
2f2dc053 4123 }
2f2dc053 4124
81c5a148
YZ		 4125 err = encode_snap_realms(mdsc, &recon_state);
4126 if (err < 0)
4127 goto fail;
4128
4129 if (recon_state.msg_version >= 5) {
4130 err = ceph_pagelist_encode_8(recon_state.pagelist, 0);
4131 if (err < 0)
4132 goto fail;
4133 }
44c99757 4134
81c5a148
YZ		 4135 if (recon_state.nr_caps || recon_state.nr_realms) {
4136 struct page *page =
4137 list_first_entry(&recon_state.pagelist->head,
4138 struct page, lru);
44c99757 4139 __le32 *addr = kmap_atomic(page);
81c5a148
YZ		 4140 if (recon_state.nr_caps) {
4141 WARN_ON(recon_state.nr_realms != mdsc->num_snap_realms);
4142 *addr = cpu_to_le32(recon_state.nr_caps);
4143 } else if (recon_state.msg_version >= 4) {
4144 *(addr + 1) = cpu_to_le32(recon_state.nr_realms);
4145 }
44c99757 4146 kunmap_atomic(addr);
ebf18f47 4147 }
44c99757 4148
81c5a148
YZ		 4149 reply->hdr.version = cpu_to_le16(recon_state.msg_version);
4150 if (recon_state.msg_version >= 4)
4151 reply->hdr.compat_version = cpu_to_le16(4);
e548e9b9 4152
81c5a148
YZ		 4153 reply->hdr.data_len = cpu_to_le32(recon_state.pagelist->length);
4154 ceph_msg_data_add_pagelist(reply, recon_state.pagelist);
e548e9b9 4155
2f2dc053
SW		 4156 ceph_con_send(&session->s_con, reply);
4157
9abf82b8
SW		 4158 mutex_unlock(&session->s_mutex);
4159
4160 mutex_lock(&mdsc->mutex);
4161 __wake_requests(mdsc, &session->s_waiting);
4162 mutex_unlock(&mdsc->mutex);
4163
2f2dc053 4164 up_read(&mdsc->snap_rwsem);
81c5a148 4165 ceph_pagelist_release(recon_state.pagelist);
2f2dc053
SW		 4166 return;
4167
93cea5be 4168fail:
2f2dc053 4169 ceph_msg_put(reply);
9abf82b8
SW		 4170 up_read(&mdsc->snap_rwsem);
4171 mutex_unlock(&session->s_mutex);
93cea5be 4172fail_nomsg:
81c5a148 4173 ceph_pagelist_release(recon_state.pagelist);
93cea5be 4174fail_nopagelist:
9abf82b8 4175 pr_err("error %d preparing reconnect for mds%d\n", err, mds);
9abf82b8 4176 return;
2f2dc053
SW		 4177}
4178
4179
4180/*
4181 * compare old and new mdsmaps, kicking requests
4182 * and closing out old connections as necessary
4183 *
4184 * called under mdsc->mutex.
4185 */
4186static void check_new_map(struct ceph_mds_client *mdsc,
4187 struct ceph_mdsmap *newmap,
4188 struct ceph_mdsmap *oldmap)
4189{
d517b398 4190 int i, j, err;
2f2dc053
SW		 4191 int oldstate, newstate;
4192 struct ceph_mds_session *s;
d517b398 4193 unsigned long targets[DIV_ROUND_UP(CEPH_MAX_MDS, sizeof(unsigned long))] = {0};
2f2dc053
SW		 4194
4195 dout("check_new_map new %u old %u\n",
4196 newmap->m_epoch, oldmap->m_epoch);
4197
d517b398
XL		 4198 if (newmap->m_info) {
4199 for (i = 0; i < newmap->possible_max_rank; i++) {
4200 for (j = 0; j < newmap->m_info[i].num_export_targets; j++)
4201 set_bit(newmap->m_info[i].export_targets[j], targets);
4202 }
4203 }
4204
b38c9eb4 4205 for (i = 0; i < oldmap->possible_max_rank && i < mdsc->max_sessions; i++) {
d37b1d99 4206 if (!mdsc->sessions[i])
2f2dc053
SW		 4207 continue;
4208 s = mdsc->sessions[i];
4209 oldstate = ceph_mdsmap_get_state(oldmap, i);
4210 newstate = ceph_mdsmap_get_state(newmap, i);
4211
0deb01c9 4212 dout("check_new_map mds%d state %s%s -> %s%s (session %s)\n",
2f2dc053 4213 i, ceph_mds_state_name(oldstate),
0deb01c9 4214 ceph_mdsmap_is_laggy(oldmap, i) ? " (laggy)" : "",
2f2dc053 4215 ceph_mds_state_name(newstate),
0deb01c9 4216 ceph_mdsmap_is_laggy(newmap, i) ? " (laggy)" : "",
a687ecaf 4217 ceph_session_state_name(s->s_state));
2f2dc053 4218
b38c9eb4 4219 if (i >= newmap->possible_max_rank) {
6f0f597b 4220 /* force close session for stopped mds */
5b3248c6 4221 ceph_get_mds_session(s);
6f0f597b
YZ		 4222 __unregister_session(mdsc, s);
4223 __wake_requests(mdsc, &s->s_waiting);
4224 mutex_unlock(&mdsc->mutex);
2827528d 4225
6f0f597b
YZ		 4226 mutex_lock(&s->s_mutex);
4227 cleanup_session_requests(mdsc, s);
4228 remove_session_caps(s);
4229 mutex_unlock(&s->s_mutex);
2827528d 4230
6f0f597b 4231 ceph_put_mds_session(s);
2827528d 4232
6f0f597b
YZ		 4233 mutex_lock(&mdsc->mutex);
4234 kick_requests(mdsc, i);
4235 continue;
4236 }
4237
4238 if (memcmp(ceph_mdsmap_get_addr(oldmap, i),
4239 ceph_mdsmap_get_addr(newmap, i),
4240 sizeof(struct ceph_entity_addr))) {
4241 /* just close it */
4242 mutex_unlock(&mdsc->mutex);
4243 mutex_lock(&s->s_mutex);
4244 mutex_lock(&mdsc->mutex);
4245 ceph_con_close(&s->s_con);
4246 mutex_unlock(&s->s_mutex);
4247 s->s_state = CEPH_MDS_SESSION_RESTARTING;
2f2dc053
SW		 4248 } else if (oldstate == newstate) {
4249 continue; /* nothing new with this mds */
4250 }
4251
4252 /*
4253 * send reconnect?
4254 */
4255 if (s->s_state == CEPH_MDS_SESSION_RESTARTING &&
34b6c855
SW		 4256 newstate >= CEPH_MDS_STATE_RECONNECT) {
4257 mutex_unlock(&mdsc->mutex);
d517b398 4258 clear_bit(i, targets);
34b6c855
SW		 4259 send_mds_reconnect(mdsc, s);
4260 mutex_lock(&mdsc->mutex);
4261 }
2f2dc053
SW		 4262
4263 /*
29790f26 4264 * kick request on any mds that has gone active.
2f2dc053
SW		 4265 */
4266 if (oldstate < CEPH_MDS_STATE_ACTIVE &&
4267 newstate >= CEPH_MDS_STATE_ACTIVE) {
29790f26
SW		 4268 if (oldstate != CEPH_MDS_STATE_CREATING &&
4269 oldstate != CEPH_MDS_STATE_STARTING)
4270 pr_info("mds%d recovery completed\n", s->s_mds);
4271 kick_requests(mdsc, i);
ea8412b2 4272 mutex_unlock(&mdsc->mutex);
829ad4db 4273 mutex_lock(&s->s_mutex);
ea8412b2 4274 mutex_lock(&mdsc->mutex);
2f2dc053 4275 ceph_kick_flushing_caps(mdsc, s);
829ad4db 4276 mutex_unlock(&s->s_mutex);
d2f8bb27 4277 wake_up_session_caps(s, RECONNECT);
2f2dc053
SW		 4278 }
4279 }
cb170a22 4280
d517b398
XL		 4281 /*
4282 * Only open and reconnect sessions that don't exist yet.
4283 */
4284 for (i = 0; i < newmap->possible_max_rank; i++) {
4285 /*
4286 * In case the import MDS is crashed just after
4287 * the EImportStart journal is flushed, so when
4288 * a standby MDS takes over it and is replaying
4289 * the EImportStart journal the new MDS daemon
4290 * will wait the client to reconnect it, but the
4291 * client may never register/open the session yet.
4292 *
4293 * Will try to reconnect that MDS daemon if the
4294 * rank number is in the export targets array and
4295 * is the up:reconnect state.
4296 */
4297 newstate = ceph_mdsmap_get_state(newmap, i);
4298 if (!test_bit(i, targets) || newstate != CEPH_MDS_STATE_RECONNECT)
4299 continue;
4300
4301 /*
4302 * The session maybe registered and opened by some
4303 * requests which were choosing random MDSes during
4304 * the mdsc->mutex's unlock/lock gap below in rare
4305 * case. But the related MDS daemon will just queue
4306 * that requests and be still waiting for the client's
4307 * reconnection request in up:reconnect state.
4308 */
4309 s = __ceph_lookup_mds_session(mdsc, i);
4310 if (likely(!s)) {
4311 s = __open_export_target_session(mdsc, i);
4312 if (IS_ERR(s)) {
4313 err = PTR_ERR(s);
4314 pr_err("failed to open export target session, err %d\n",
4315 err);
4316 continue;
4317 }
4318 }
4319 dout("send reconnect to export target mds.%d\n", i);
4320 mutex_unlock(&mdsc->mutex);
4321 send_mds_reconnect(mdsc, s);
4322 ceph_put_mds_session(s);
4323 mutex_lock(&mdsc->mutex);
4324 }
4325
b38c9eb4 4326 for (i = 0; i < newmap->possible_max_rank && i < mdsc->max_sessions; i++) {
cb170a22
SW		 4327 s = mdsc->sessions[i];
4328 if (!s)
4329 continue;
4330 if (!ceph_mdsmap_is_laggy(newmap, i))
4331 continue;
4332 if (s->s_state == CEPH_MDS_SESSION_OPEN ||
4333 s->s_state == CEPH_MDS_SESSION_HUNG ||
4334 s->s_state == CEPH_MDS_SESSION_CLOSING) {
4335 dout(" connecting to export targets of laggy mds%d\n",
4336 i);
4337 __open_export_target_sessions(mdsc, s);
4338 }
4339 }
2f2dc053
SW		 4340}
4341
4342
4343
4344/*
4345 * leases
4346 */
4347
4348/*
4349 * caller must hold session s_mutex, dentry->d_lock
4350 */
4351void __ceph_mdsc_drop_dentry_lease(struct dentry *dentry)
4352{
4353 struct ceph_dentry_info *di = ceph_dentry(dentry);
4354
4355 ceph_put_mds_session(di->lease_session);
4356 di->lease_session = NULL;
4357}
4358
2600d2dd
SW		 4359static void handle_lease(struct ceph_mds_client *mdsc,
4360 struct ceph_mds_session *session,
4361 struct ceph_msg *msg)
2f2dc053 4362{
3d14c5d2 4363 struct super_block *sb = mdsc->fsc->sb;
2f2dc053 4364 struct inode *inode;
2f2dc053
SW		 4365 struct dentry *parent, *dentry;
4366 struct ceph_dentry_info *di;
2600d2dd 4367 int mds = session->s_mds;
2f2dc053 4368 struct ceph_mds_lease *h = msg->front.iov_base;
1e5ea23d 4369 u32 seq;
2f2dc053 4370 struct ceph_vino vino;
2f2dc053
SW		 4371 struct qstr dname;
4372 int release = 0;
4373
2f2dc053
SW		 4374 dout("handle_lease from mds%d\n", mds);
4375
4376 /* decode */
4377 if (msg->front.iov_len < sizeof(*h) + sizeof(u32))
4378 goto bad;
4379 vino.ino = le64_to_cpu(h->ino);
4380 vino.snap = CEPH_NOSNAP;
1e5ea23d 4381 seq = le32_to_cpu(h->seq);
0fcf6c02
YZ		 4382 dname.len = get_unaligned_le32(h + 1);
4383 if (msg->front.iov_len < sizeof(*h) + sizeof(u32) + dname.len)
2f2dc053 4384 goto bad;
0fcf6c02 4385 dname.name = (void *)(h + 1) + sizeof(u32);
2f2dc053 4386
2f2dc053
SW		 4387 /* lookup inode */
4388 inode = ceph_find_inode(sb, vino);
2f90b852
SW		 4389 dout("handle_lease %s, ino %llx %p %.*s\n",
4390 ceph_lease_op_name(h->action), vino.ino, inode,
1e5ea23d 4391 dname.len, dname.name);
6cd3bcad
YZ		 4392
4393 mutex_lock(&session->s_mutex);
62575e27 4394 inc_session_sequence(session);
6cd3bcad 4395
d37b1d99 4396 if (!inode) {
2f2dc053
SW		 4397 dout("handle_lease no inode %llx\n", vino.ino);
4398 goto release;
4399 }
2f2dc053
SW		 4400
4401 /* dentry */
4402 parent = d_find_alias(inode);
4403 if (!parent) {
4404 dout("no parent dentry on inode %p\n", inode);
4405 WARN_ON(1);
4406 goto release; /* hrm... */
4407 }
8387ff25 4408 dname.hash = full_name_hash(parent, dname.name, dname.len);
2f2dc053
SW		 4409 dentry = d_lookup(parent, &dname);
4410 dput(parent);
4411 if (!dentry)
4412 goto release;
4413
4414 spin_lock(&dentry->d_lock);
4415 di = ceph_dentry(dentry);
4416 switch (h->action) {
4417 case CEPH_MDS_LEASE_REVOKE:
3d8eb7a9 4418 if (di->lease_session == session) {
1e5ea23d
SW		 4419 if (ceph_seq_cmp(di->lease_seq, seq) > 0)
4420 h->seq = cpu_to_le32(di->lease_seq);
2f2dc053
SW		 4421 __ceph_mdsc_drop_dentry_lease(dentry);
4422 }
4423 release = 1;
4424 break;
4425
4426 case CEPH_MDS_LEASE_RENEW:
3d8eb7a9 4427 if (di->lease_session == session &&
52d60f8e 4428 di->lease_gen == atomic_read(&session->s_cap_gen) &&
2f2dc053
SW		 4429 di->lease_renew_from &&
4430 di->lease_renew_after == 0) {
4431 unsigned long duration =
3563dbdd 4432 msecs_to_jiffies(le32_to_cpu(h->duration_ms));
2f2dc053 4433
1e5ea23d 4434 di->lease_seq = seq;
9b16f03c 4435 di->time = di->lease_renew_from + duration;
2f2dc053
SW		 4436 di->lease_renew_after = di->lease_renew_from +
4437 (duration >> 1);
4438 di->lease_renew_from = 0;
4439 }
4440 break;
4441 }
4442 spin_unlock(&dentry->d_lock);
4443 dput(dentry);
4444
4445 if (!release)
4446 goto out;
4447
4448release:
4449 /* let's just reuse the same message */
4450 h->action = CEPH_MDS_LEASE_REVOKE_ACK;
4451 ceph_msg_get(msg);
4452 ceph_con_send(&session->s_con, msg);
4453
4454out:
2f2dc053 4455 mutex_unlock(&session->s_mutex);
23c2c76e 4456 iput(inode);
2f2dc053
SW		 4457 return;
4458
4459bad:
4460 pr_err("corrupt lease message\n");
9ec7cab1 4461 ceph_msg_dump(msg);
2f2dc053
SW		 4462}
4463
4464void ceph_mdsc_lease_send_msg(struct ceph_mds_session *session,
2f2dc053
SW		 4465 struct dentry *dentry, char action,
4466 u32 seq)
4467{
4468 struct ceph_msg *msg;
4469 struct ceph_mds_lease *lease;
8f2a98ef
YZ		 4470 struct inode *dir;
4471 int len = sizeof(*lease) + sizeof(u32) + NAME_MAX;
2f2dc053 4472
8f2a98ef
YZ		 4473 dout("lease_send_msg identry %p %s to mds%d\n",
4474 dentry, ceph_lease_op_name(action), session->s_mds);
2f2dc053 4475
b61c2763 4476 msg = ceph_msg_new(CEPH_MSG_CLIENT_LEASE, len, GFP_NOFS, false);
a79832f2 4477 if (!msg)
2f2dc053
SW		 4478 return;
4479 lease = msg->front.iov_base;
4480 lease->action = action;
2f2dc053 4481 lease->seq = cpu_to_le32(seq);
2f2dc053 4482
8f2a98ef
YZ		 4483 spin_lock(&dentry->d_lock);
4484 dir = d_inode(dentry->d_parent);
4485 lease->ino = cpu_to_le64(ceph_ino(dir));
4486 lease->first = lease->last = cpu_to_le64(ceph_snap(dir));
4487
4488 put_unaligned_le32(dentry->d_name.len, lease + 1);
4489 memcpy((void *)(lease + 1) + 4,
4490 dentry->d_name.name, dentry->d_name.len);
4491 spin_unlock(&dentry->d_lock);
2f2dc053
SW		 4492 /*
4493 * if this is a preemptive lease RELEASE, no need to
4494 * flush request stream, since the actual request will
4495 * soon follow.
4496 */
4497 msg->more_to_follow = (action == CEPH_MDS_LEASE_RELEASE);
4498
4499 ceph_con_send(&session->s_con, msg);
4500}
4501
2f2dc053 4502/*
59b312f3 4503 * lock unlock the session, to wait ongoing session activities
2f2dc053 4504 */
59b312f3 4505static void lock_unlock_session(struct ceph_mds_session *s)
2f2dc053 4506{
59b312f3
XL		 4507 mutex_lock(&s->s_mutex);
4508 mutex_unlock(&s->s_mutex);
2f2dc053
SW		 4509}
4510
131d7eb4
YZ		 4511static void maybe_recover_session(struct ceph_mds_client *mdsc)
4512{
4513 struct ceph_fs_client *fsc = mdsc->fsc;
4514
4515 if (!ceph_test_mount_opt(fsc, CLEANRECOVER))
4516 return;
2f2dc053 4517
131d7eb4
YZ		 4518 if (READ_ONCE(fsc->mount_state) != CEPH_MOUNT_MOUNTED)
4519 return;
4520
0b98acd6 4521 if (!READ_ONCE(fsc->blocklisted))
131d7eb4
YZ		 4522 return;
4523
0b98acd6 4524 pr_info("auto reconnect after blocklisted\n");
131d7eb4
YZ		 4525 ceph_force_reconnect(fsc->sb);
4526}
2f2dc053 4527
3e699bd8
XL		 4528bool check_session_state(struct ceph_mds_session *s)
4529{
42ad631b
XL		 4530 struct ceph_fs_client *fsc = s->s_mdsc->fsc;
4531
62575e27
JL		 4532 switch (s->s_state) {
4533 case CEPH_MDS_SESSION_OPEN:
4534 if (s->s_ttl && time_after(jiffies, s->s_ttl)) {
3e699bd8
XL		 4535 s->s_state = CEPH_MDS_SESSION_HUNG;
4536 pr_info("mds%d hung\n", s->s_mds);
4537 }
62575e27
JL		 4538 break;
4539 case CEPH_MDS_SESSION_CLOSING:
42ad631b
XL		 4540 /* Should never reach this when not force unmounting */
4541 WARN_ON_ONCE(s->s_ttl &&
4542 READ_ONCE(fsc->mount_state) != CEPH_MOUNT_SHUTDOWN);
62575e27
JL		 4543 fallthrough;
4544 case CEPH_MDS_SESSION_NEW:
4545 case CEPH_MDS_SESSION_RESTARTING:
4546 case CEPH_MDS_SESSION_CLOSED:
4547 case CEPH_MDS_SESSION_REJECTED:
3e699bd8 4548 return false;
62575e27 4549 }
3e699bd8
XL		 4550
4551 return true;
4552}
4553
62575e27
JL		 4554/*
4555 * If the sequence is incremented while we're waiting on a REQUEST_CLOSE reply,
4556 * then we need to retransmit that request.
4557 */
4558void inc_session_sequence(struct ceph_mds_session *s)
4559{
4560 lockdep_assert_held(&s->s_mutex);
4561
4562 s->s_seq++;
4563
4564 if (s->s_state == CEPH_MDS_SESSION_CLOSING) {
4565 int ret;
4566
4567 dout("resending session close request for mds%d\n", s->s_mds);
4568 ret = request_close_session(s);
4569 if (ret < 0)
4570 pr_err("unable to close session to mds%d: %d\n",
4571 s->s_mds, ret);
4572 }
4573}
4574
2f2dc053 4575/*
bf2ba432
LH		 4576 * delayed work -- periodically trim expired leases, renew caps with mds. If
4577 * the @delay parameter is set to 0 or if it's more than 5 secs, the default
4578 * workqueue delay value of 5 secs will be used.
2f2dc053 4579 */
bf2ba432 4580static void schedule_delayed(struct ceph_mds_client *mdsc, unsigned long delay)
2f2dc053 4581{
bf2ba432
LH		 4582 unsigned long max_delay = HZ * 5;
4583
4584 /* 5 secs default delay */
4585 if (!delay || (delay > max_delay))
4586 delay = max_delay;
4587 schedule_delayed_work(&mdsc->delayed_work,
4588 round_jiffies_relative(delay));
2f2dc053
SW		 4589}
4590
4591static void delayed_work(struct work_struct *work)
4592{
2f2dc053
SW		 4593 struct ceph_mds_client *mdsc =
4594 container_of(work, struct ceph_mds_client, delayed_work.work);
bf2ba432 4595 unsigned long delay;
2f2dc053
SW		 4596 int renew_interval;
4597 int renew_caps;
bf2ba432 4598 int i;
2f2dc053
SW		 4599
4600 dout("mdsc delayed_work\n");
75c9627e 4601
fa996773
XL		 4602 if (mdsc->stopping)
4603 return;
4604
2f2dc053
SW		 4605 mutex_lock(&mdsc->mutex);
4606 renew_interval = mdsc->mdsmap->m_session_timeout >> 2;
4607 renew_caps = time_after_eq(jiffies, HZ*renew_interval +
4608 mdsc->last_renew_caps);
4609 if (renew_caps)
4610 mdsc->last_renew_caps = jiffies;
4611
4612 for (i = 0; i < mdsc->max_sessions; i++) {
4613 struct ceph_mds_session *s = __ceph_lookup_mds_session(mdsc, i);
d37b1d99 4614 if (!s)
2f2dc053 4615 continue;
3e699bd8
XL		 4616
4617 if (!check_session_state(s)) {
2f2dc053
SW		 4618 ceph_put_mds_session(s);
4619 continue;
4620 }
4621 mutex_unlock(&mdsc->mutex);
4622
4623 mutex_lock(&s->s_mutex);
4624 if (renew_caps)
4625 send_renew_caps(mdsc, s);
4626 else
4627 ceph_con_keepalive(&s->s_con);
aab53dd9
SW		 4628 if (s->s_state == CEPH_MDS_SESSION_OPEN ||
4629 s->s_state == CEPH_MDS_SESSION_HUNG)
3d7ded4d 4630 ceph_send_cap_releases(mdsc, s);
2f2dc053
SW		 4631 mutex_unlock(&s->s_mutex);
4632 ceph_put_mds_session(s);
4633
4634 mutex_lock(&mdsc->mutex);
4635 }
4636 mutex_unlock(&mdsc->mutex);
4637
bf2ba432 4638 delay = ceph_check_delayed_caps(mdsc);
37c4efc1
YZ		 4639
4640 ceph_queue_cap_reclaim_work(mdsc);
4641
4642 ceph_trim_snapid_map(mdsc);
4643
131d7eb4
YZ		 4644 maybe_recover_session(mdsc);
4645
bf2ba432 4646 schedule_delayed(mdsc, delay);
2f2dc053
SW		 4647}
4648
3d14c5d2 4649int ceph_mdsc_init(struct ceph_fs_client *fsc)
2f2dc053 4650
2f2dc053 4651{
3d14c5d2 4652 struct ceph_mds_client *mdsc;
f9009efa 4653 int err;
3d14c5d2
YS		 4654
4655 mdsc = kzalloc(sizeof(struct ceph_mds_client), GFP_NOFS);
4656 if (!mdsc)
4657 return -ENOMEM;
4658 mdsc->fsc = fsc;
2f2dc053
SW		 4659 mutex_init(&mdsc->mutex);
4660 mdsc->mdsmap = kzalloc(sizeof(*mdsc->mdsmap), GFP_NOFS);
d37b1d99 4661 if (!mdsc->mdsmap) {
f9009efa
XL		 4662 err = -ENOMEM;
4663 goto err_mdsc;
fb3101b6 4664 }
2d06eeb8 4665
2f2dc053 4666 init_completion(&mdsc->safe_umount_waiters);
f3c60c59 4667 init_waitqueue_head(&mdsc->session_close_wq);
2f2dc053 4668 INIT_LIST_HEAD(&mdsc->waiting_for_map);
0c44a8e0
LH		 4669 mdsc->quotarealms_inodes = RB_ROOT;
4670 mutex_init(&mdsc->quotarealms_inodes_mutex);
2f2dc053 4671 init_rwsem(&mdsc->snap_rwsem);
a105f00c 4672 mdsc->snap_realms = RB_ROOT;
2f2dc053
SW		 4673 INIT_LIST_HEAD(&mdsc->snap_empty);
4674 spin_lock_init(&mdsc->snap_empty_lock);
44ca18f2 4675 mdsc->request_tree = RB_ROOT;
2f2dc053
SW		 4676 INIT_DELAYED_WORK(&mdsc->delayed_work, delayed_work);
4677 mdsc->last_renew_caps = jiffies;
4678 INIT_LIST_HEAD(&mdsc->cap_delay_list);
3a3430af 4679 INIT_LIST_HEAD(&mdsc->cap_wait_list);
2f2dc053
SW		 4680 spin_lock_init(&mdsc->cap_delay_lock);
4681 INIT_LIST_HEAD(&mdsc->snap_flush_list);
4682 spin_lock_init(&mdsc->snap_flush_lock);
553adfd9 4683 mdsc->last_cap_flush_tid = 1;
e4500b5e 4684 INIT_LIST_HEAD(&mdsc->cap_flush_list);
db354052 4685 INIT_LIST_HEAD(&mdsc->cap_dirty_migrating);
2f2dc053
SW		 4686 spin_lock_init(&mdsc->cap_dirty_lock);
4687 init_waitqueue_head(&mdsc->cap_flushing_wq);
37c4efc1 4688 INIT_WORK(&mdsc->cap_reclaim_work, ceph_cap_reclaim_work);
f9009efa
XL		 4689 err = ceph_metric_init(&mdsc->metric);
4690 if (err)
4691 goto err_mdsmap;
37c4efc1
YZ		 4692
4693 spin_lock_init(&mdsc->dentry_list_lock);
4694 INIT_LIST_HEAD(&mdsc->dentry_leases);
4695 INIT_LIST_HEAD(&mdsc->dentry_dir_leases);
2d06eeb8 4696
37151668 4697 ceph_caps_init(mdsc);
fe33032d 4698 ceph_adjust_caps_max_min(mdsc, fsc->mount_options);
37151668 4699
75c9627e
YZ		 4700 spin_lock_init(&mdsc->snapid_map_lock);
4701 mdsc->snapid_map_tree = RB_ROOT;
4702 INIT_LIST_HEAD(&mdsc->snapid_map_lru);
4703
10183a69
YZ		 4704 init_rwsem(&mdsc->pool_perm_rwsem);
4705 mdsc->pool_perm_tree = RB_ROOT;
4706
dfeb84d4
YZ		 4707 strscpy(mdsc->nodename, utsname()->nodename,
4708 sizeof(mdsc->nodename));
a7caa88f
XL		 4709
4710 fsc->mdsc = mdsc;
5f44f142 4711 return 0;
f9009efa
XL		 4712
4713err_mdsmap:
4714 kfree(mdsc->mdsmap);
4715err_mdsc:
4716 kfree(mdsc);
4717 return err;
2f2dc053
SW		 4718}
4719
4720/*
4721 * Wait for safe replies on open mds requests. If we time out, drop
4722 * all requests from the tree to avoid dangling dentry refs.
4723 */
4724static void wait_requests(struct ceph_mds_client *mdsc)
4725{
a319bf56 4726 struct ceph_options *opts = mdsc->fsc->client->options;
2f2dc053 4727 struct ceph_mds_request *req;
2f2dc053
SW		 4728
4729 mutex_lock(&mdsc->mutex);
44ca18f2 4730 if (__get_oldest_req(mdsc)) {
2f2dc053 4731 mutex_unlock(&mdsc->mutex);
44ca18f2 4732
2f2dc053
SW		 4733 dout("wait_requests waiting for requests\n");
4734 wait_for_completion_timeout(&mdsc->safe_umount_waiters,
a319bf56 4735 ceph_timeout_jiffies(opts->mount_timeout));
2f2dc053
SW		 4736
4737 /* tear down remaining requests */
44ca18f2
SW		 4738 mutex_lock(&mdsc->mutex);
4739 while ((req = __get_oldest_req(mdsc))) {
2f2dc053
SW		 4740 dout("wait_requests timed out on tid %llu\n",
4741 req->r_tid);
428138c9 4742 list_del_init(&req->r_wait);
44ca18f2 4743 __unregister_request(mdsc, req);
2f2dc053
SW		 4744 }
4745 }
4746 mutex_unlock(&mdsc->mutex);
4747 dout("wait_requests done\n");
4748}
4749
d095559c
XL		 4750void send_flush_mdlog(struct ceph_mds_session *s)
4751{
4752 struct ceph_msg *msg;
4753
4754 /*
4755 * Pre-luminous MDS crashes when it sees an unknown session request
4756 */
4757 if (!CEPH_HAVE_FEATURE(s->s_con.peer_features, SERVER_LUMINOUS))
4758 return;
4759
4760 mutex_lock(&s->s_mutex);
4761 dout("request mdlog flush to mds%d (%s)s seq %lld\n", s->s_mds,
4762 ceph_session_state_name(s->s_state), s->s_seq);
4763 msg = ceph_create_session_msg(CEPH_SESSION_REQUEST_FLUSH_MDLOG,
4764 s->s_seq);
4765 if (!msg) {
4766 pr_err("failed to request mdlog flush to mds%d (%s) seq %lld\n",
4767 s->s_mds, ceph_session_state_name(s->s_state), s->s_seq);
4768 } else {
4769 ceph_con_send(&s->s_con, msg);
4770 }
4771 mutex_unlock(&s->s_mutex);
4772}
4773
2f2dc053
SW		 4774/*
4775 * called before mount is ro, and before dentries are torn down.
4776 * (hmm, does this still race with new lookups?)
4777 */
4778void ceph_mdsc_pre_umount(struct ceph_mds_client *mdsc)
4779{
4780 dout("pre_umount\n");
4781 mdsc->stopping = 1;
4782
d095559c 4783 ceph_mdsc_iterate_sessions(mdsc, send_flush_mdlog, true);
59b312f3 4784 ceph_mdsc_iterate_sessions(mdsc, lock_unlock_session, false);
afcdaea3 4785 ceph_flush_dirty_caps(mdsc);
2f2dc053 4786 wait_requests(mdsc);
17c688c3
SW		 4787
4788 /*
4789 * wait for reply handlers to drop their request refs and
4790 * their inode/dcache refs
4791 */
4792 ceph_msgr_flush();
0c44a8e0
LH		 4793
4794 ceph_cleanup_quotarealms_inodes(mdsc);
2f2dc053
SW		 4795}
4796
4797/*
4798 * wait for all write mds requests to flush.
4799 */
4800static void wait_unsafe_requests(struct ceph_mds_client *mdsc, u64 want_tid)
4801{
80fc7314 4802 struct ceph_mds_request *req = NULL, *nextreq;
44ca18f2 4803 struct rb_node *n;
2f2dc053
SW		 4804
4805 mutex_lock(&mdsc->mutex);
4806 dout("wait_unsafe_requests want %lld\n", want_tid);
80fc7314 4807restart:
44ca18f2
SW		 4808 req = __get_oldest_req(mdsc);
4809 while (req && req->r_tid <= want_tid) {
80fc7314
SW		 4810 /* find next request */
4811 n = rb_next(&req->r_node);
4812 if (n)
4813 nextreq = rb_entry(n, struct ceph_mds_request, r_node);
4814 else
4815 nextreq = NULL;
e8a7b8b1
YZ		 4816 if (req->r_op != CEPH_MDS_OP_SETFILELOCK &&
4817 (req->r_op & CEPH_MDS_OP_WRITE)) {
44ca18f2
SW		 4818 /* write op */
4819 ceph_mdsc_get_request(req);
80fc7314
SW		 4820 if (nextreq)
4821 ceph_mdsc_get_request(nextreq);
44ca18f2
SW		 4822 mutex_unlock(&mdsc->mutex);
4823 dout("wait_unsafe_requests wait on %llu (want %llu)\n",
4824 req->r_tid, want_tid);
4825 wait_for_completion(&req->r_safe_completion);
4826 mutex_lock(&mdsc->mutex);
44ca18f2 4827 ceph_mdsc_put_request(req);
80fc7314
SW		 4828 if (!nextreq)
4829 break; /* next dne before, so we're done! */
4830 if (RB_EMPTY_NODE(&nextreq->r_node)) {
4831 /* next request was removed from tree */
4832 ceph_mdsc_put_request(nextreq);
4833 goto restart;
4834 }
4835 ceph_mdsc_put_request(nextreq); /* won't go away */
44ca18f2 4836 }
80fc7314 4837 req = nextreq;
2f2dc053
SW		 4838 }
4839 mutex_unlock(&mdsc->mutex);
4840 dout("wait_unsafe_requests done\n");
4841}
4842
4843void ceph_mdsc_sync(struct ceph_mds_client *mdsc)
4844{
0e294387 4845 u64 want_tid, want_flush;
2f2dc053 4846
50c9132d 4847 if (READ_ONCE(mdsc->fsc->mount_state) >= CEPH_MOUNT_SHUTDOWN)
56b7cf95
SW		 4848 return;
4849
2f2dc053
SW		 4850 dout("sync\n");
4851 mutex_lock(&mdsc->mutex);
4852 want_tid = mdsc->last_tid;
2f2dc053 4853 mutex_unlock(&mdsc->mutex);
2f2dc053 4854
afcdaea3 4855 ceph_flush_dirty_caps(mdsc);
d3383a8e 4856 spin_lock(&mdsc->cap_dirty_lock);
8310b089 4857 want_flush = mdsc->last_cap_flush_tid;
c8799fc4
YZ		 4858 if (!list_empty(&mdsc->cap_flush_list)) {
4859 struct ceph_cap_flush *cf =
4860 list_last_entry(&mdsc->cap_flush_list,
4861 struct ceph_cap_flush, g_list);
4862 cf->wake = true;
4863 }
d3383a8e
YZ		 4864 spin_unlock(&mdsc->cap_dirty_lock);
4865
0e294387
YZ		 4866 dout("sync want tid %lld flush_seq %lld\n",
4867 want_tid, want_flush);
2f2dc053
SW		 4868
4869 wait_unsafe_requests(mdsc, want_tid);
0e294387 4870 wait_caps_flush(mdsc, want_flush);
2f2dc053
SW		 4871}
4872
f3c60c59
SW		 4873/*
4874 * true if all sessions are closed, or we force unmount
4875 */
fcff415c 4876static bool done_closing_sessions(struct ceph_mds_client *mdsc, int skipped)
f3c60c59 4877{
52953d55 4878 if (READ_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_SHUTDOWN)
f3c60c59 4879 return true;
fcff415c 4880 return atomic_read(&mdsc->num_sessions) <= skipped;
f3c60c59 4881}
2f2dc053
SW		 4882
4883/*
4884 * called after sb is ro.
4885 */
4886void ceph_mdsc_close_sessions(struct ceph_mds_client *mdsc)
4887{
a319bf56 4888 struct ceph_options *opts = mdsc->fsc->client->options;
2f2dc053
SW		 4889 struct ceph_mds_session *session;
4890 int i;
fcff415c 4891 int skipped = 0;
2f2dc053
SW		 4892
4893 dout("close_sessions\n");
4894
2f2dc053 4895 /* close sessions */
f3c60c59
SW		 4896 mutex_lock(&mdsc->mutex);
4897 for (i = 0; i < mdsc->max_sessions; i++) {
4898 session = __ceph_lookup_mds_session(mdsc, i);
4899 if (!session)
4900 continue;
2f2dc053 4901 mutex_unlock(&mdsc->mutex);
f3c60c59 4902 mutex_lock(&session->s_mutex);
fcff415c
YZ		 4903 if (__close_session(mdsc, session) <= 0)
4904 skipped++;
f3c60c59
SW		 4905 mutex_unlock(&session->s_mutex);
4906 ceph_put_mds_session(session);
2f2dc053
SW		 4907 mutex_lock(&mdsc->mutex);
4908 }
f3c60c59
SW		 4909 mutex_unlock(&mdsc->mutex);
4910
4911 dout("waiting for sessions to close\n");
fcff415c
YZ		 4912 wait_event_timeout(mdsc->session_close_wq,
4913 done_closing_sessions(mdsc, skipped),
a319bf56 4914 ceph_timeout_jiffies(opts->mount_timeout));
2f2dc053
SW		 4915
4916 /* tear down remaining sessions */
f3c60c59 4917 mutex_lock(&mdsc->mutex);
2f2dc053
SW		 4918 for (i = 0; i < mdsc->max_sessions; i++) {
4919 if (mdsc->sessions[i]) {
5b3248c6 4920 session = ceph_get_mds_session(mdsc->sessions[i]);
2600d2dd 4921 __unregister_session(mdsc, session);
2f2dc053
SW		 4922 mutex_unlock(&mdsc->mutex);
4923 mutex_lock(&session->s_mutex);
4924 remove_session_caps(session);
4925 mutex_unlock(&session->s_mutex);
4926 ceph_put_mds_session(session);
4927 mutex_lock(&mdsc->mutex);
4928 }
4929 }
2f2dc053 4930 WARN_ON(!list_empty(&mdsc->cap_delay_list));
2f2dc053
SW		 4931 mutex_unlock(&mdsc->mutex);
4932
75c9627e 4933 ceph_cleanup_snapid_map(mdsc);
2f2dc053
SW		 4934 ceph_cleanup_empty_realms(mdsc);
4935
37c4efc1 4936 cancel_work_sync(&mdsc->cap_reclaim_work);
2f2dc053
SW		 4937 cancel_delayed_work_sync(&mdsc->delayed_work); /* cancel timer */
4938
4939 dout("stopped\n");
4940}
4941
48fec5d0
YZ		 4942void ceph_mdsc_force_umount(struct ceph_mds_client *mdsc)
4943{
4944 struct ceph_mds_session *session;
4945 int mds;
4946
4947 dout("force umount\n");
4948
4949 mutex_lock(&mdsc->mutex);
4950 for (mds = 0; mds < mdsc->max_sessions; mds++) {
4951 session = __ceph_lookup_mds_session(mdsc, mds);
4952 if (!session)
4953 continue;
d468e729
YZ		 4954
4955 if (session->s_state == CEPH_MDS_SESSION_REJECTED)
4956 __unregister_session(mdsc, session);
4957 __wake_requests(mdsc, &session->s_waiting);
48fec5d0 4958 mutex_unlock(&mdsc->mutex);
d468e729 4959
48fec5d0
YZ		 4960 mutex_lock(&session->s_mutex);
4961 __close_session(mdsc, session);
4962 if (session->s_state == CEPH_MDS_SESSION_CLOSING) {
4963 cleanup_session_requests(mdsc, session);
4964 remove_session_caps(session);
4965 }
4966 mutex_unlock(&session->s_mutex);
4967 ceph_put_mds_session(session);
d468e729 4968
48fec5d0
YZ		 4969 mutex_lock(&mdsc->mutex);
4970 kick_requests(mdsc, mds);
4971 }
4972 __wake_requests(mdsc, &mdsc->waiting_for_map);
4973 mutex_unlock(&mdsc->mutex);
4974}
4975
3d14c5d2 4976static void ceph_mdsc_stop(struct ceph_mds_client *mdsc)
2f2dc053
SW		 4977{
4978 dout("stop\n");
fa996773
XL		 4979 /*
4980 * Make sure the delayed work stopped before releasing
4981 * the resources.
4982 *
4983 * Because the cancel_delayed_work_sync() will only
4984 * guarantee that the work finishes executing. But the
4985 * delayed work will re-arm itself again after that.
4986 */
4987 flush_delayed_work(&mdsc->delayed_work);
4988
2f2dc053
SW		 4989 if (mdsc->mdsmap)
4990 ceph_mdsmap_destroy(mdsc->mdsmap);
4991 kfree(mdsc->sessions);
37151668 4992 ceph_caps_finalize(mdsc);
10183a69 4993 ceph_pool_perm_destroy(mdsc);
2f2dc053
SW		 4994}
4995
3d14c5d2
YS		 4996void ceph_mdsc_destroy(struct ceph_fs_client *fsc)
4997{
4998 struct ceph_mds_client *mdsc = fsc->mdsc;
ef550f6f 4999 dout("mdsc_destroy %p\n", mdsc);
ef550f6f 5000
50c55aec
CX		 5001 if (!mdsc)
5002 return;
5003
ef550f6f
SW		 5004 /* flush out any connection work with references to us */
5005 ceph_msgr_flush();
5006
62a65f36
YZ		 5007 ceph_mdsc_stop(mdsc);
5008
f9009efa
XL		 5009 ceph_metric_destroy(&mdsc->metric);
5010
3d14c5d2
YS		 5011 fsc->mdsc = NULL;
5012 kfree(mdsc);
ef550f6f 5013 dout("mdsc_destroy %p done\n", mdsc);
3d14c5d2
YS		 5014}
5015
430afbad
YZ		 5016void ceph_mdsc_handle_fsmap(struct ceph_mds_client *mdsc, struct ceph_msg *msg)
5017{
5018 struct ceph_fs_client *fsc = mdsc->fsc;
5019 const char *mds_namespace = fsc->mount_options->mds_namespace;
5020 void *p = msg->front.iov_base;
5021 void *end = p + msg->front.iov_len;
5022 u32 epoch;
430afbad
YZ		 5023 u32 num_fs;
5024 u32 mount_fscid = (u32)-1;
430afbad
YZ		 5025 int err = -EINVAL;
5026
5027 ceph_decode_need(&p, end, sizeof(u32), bad);
5028 epoch = ceph_decode_32(&p);
5029
5030 dout("handle_fsmap epoch %u\n", epoch);
5031
06a1ad43
JL		 5032 /* struct_v, struct_cv, map_len, epoch, legacy_client_fscid */
5033 ceph_decode_skip_n(&p, end, 2 + sizeof(u32) * 3, bad);
430afbad 5034
06a1ad43 5035 ceph_decode_32_safe(&p, end, num_fs, bad);
430afbad
YZ		 5036 while (num_fs-- > 0) {
5037 void *info_p, *info_end;
5038 u32 info_len;
430afbad
YZ		 5039 u32 fscid, namelen;
5040
5041 ceph_decode_need(&p, end, 2 + sizeof(u32), bad);
06a1ad43 5042 p += 2; // info_v, info_cv
430afbad
YZ		 5043 info_len = ceph_decode_32(&p);
5044 ceph_decode_need(&p, end, info_len, bad);
5045 info_p = p;
5046 info_end = p + info_len;
5047 p = info_end;
5048
5049 ceph_decode_need(&info_p, info_end, sizeof(u32) * 2, bad);
5050 fscid = ceph_decode_32(&info_p);
5051 namelen = ceph_decode_32(&info_p);
5052 ceph_decode_need(&info_p, info_end, namelen, bad);
5053
5054 if (mds_namespace &&
5055 strlen(mds_namespace) == namelen &&
5056 !strncmp(mds_namespace, (char *)info_p, namelen)) {
5057 mount_fscid = fscid;
5058 break;
5059 }
5060 }
5061
5062 ceph_monc_got_map(&fsc->client->monc, CEPH_SUB_FSMAP, epoch);
5063 if (mount_fscid != (u32)-1) {
5064 fsc->client->monc.fs_cluster_id = mount_fscid;
5065 ceph_monc_want_map(&fsc->client->monc, CEPH_SUB_MDSMAP,
5066 0, true);
5067 ceph_monc_renew_subs(&fsc->client->monc);
5068 } else {
5069 err = -ENOENT;
5070 goto err_out;
5071 }
5072 return;
76bd6ec4 5073
430afbad
YZ		 5074bad:
5075 pr_err("error decoding fsmap\n");
5076err_out:
5077 mutex_lock(&mdsc->mutex);
76bd6ec4 5078 mdsc->mdsmap_err = err;
430afbad
YZ		 5079 __wake_requests(mdsc, &mdsc->waiting_for_map);
5080 mutex_unlock(&mdsc->mutex);
430afbad 5081}
2f2dc053
SW		 5082
5083/*
5084 * handle mds map update.
5085 */
430afbad 5086void ceph_mdsc_handle_mdsmap(struct ceph_mds_client *mdsc, struct ceph_msg *msg)
2f2dc053
SW		 5087{
5088 u32 epoch;
5089 u32 maplen;
5090 void *p = msg->front.iov_base;
5091 void *end = p + msg->front.iov_len;
5092 struct ceph_mdsmap *newmap, *oldmap;
5093 struct ceph_fsid fsid;
5094 int err = -EINVAL;
5095
5096 ceph_decode_need(&p, end, sizeof(fsid)+2*sizeof(u32), bad);
5097 ceph_decode_copy(&p, &fsid, sizeof(fsid));
3d14c5d2 5098 if (ceph_check_fsid(mdsc->fsc->client, &fsid) < 0)
0743304d 5099 return;
c89136ea
SW		 5100 epoch = ceph_decode_32(&p);
5101 maplen = ceph_decode_32(&p);
2f2dc053
SW		 5102 dout("handle_map epoch %u len %d\n", epoch, (int)maplen);
5103
5104 /* do we need it? */
2f2dc053
SW		 5105 mutex_lock(&mdsc->mutex);
5106 if (mdsc->mdsmap && epoch <= mdsc->mdsmap->m_epoch) {
5107 dout("handle_map epoch %u <= our %u\n",
5108 epoch, mdsc->mdsmap->m_epoch);
5109 mutex_unlock(&mdsc->mutex);
5110 return;
5111 }
5112
cd1a677c 5113 newmap = ceph_mdsmap_decode(&p, end, ceph_msgr2(mdsc->fsc->client));
2f2dc053
SW		 5114 if (IS_ERR(newmap)) {
5115 err = PTR_ERR(newmap);
5116 goto bad_unlock;
5117 }
5118
5119 /* swap into place */
5120 if (mdsc->mdsmap) {
5121 oldmap = mdsc->mdsmap;
5122 mdsc->mdsmap = newmap;
5123 check_new_map(mdsc, newmap, oldmap);
5124 ceph_mdsmap_destroy(oldmap);
5125 } else {
5126 mdsc->mdsmap = newmap; /* first mds map */
5127 }
719784ba
CX		 5128 mdsc->fsc->max_file_size = min((loff_t)mdsc->mdsmap->m_max_file_size,
5129 MAX_LFS_FILESIZE);
2f2dc053
SW		 5130
5131 __wake_requests(mdsc, &mdsc->waiting_for_map);
82dcabad
ID		 5132 ceph_monc_got_map(&mdsc->fsc->client->monc, CEPH_SUB_MDSMAP,
5133 mdsc->mdsmap->m_epoch);
2f2dc053
SW		 5134
5135 mutex_unlock(&mdsc->mutex);
bf2ba432 5136 schedule_delayed(mdsc, 0);
2f2dc053
SW		 5137 return;
5138
5139bad_unlock:
5140 mutex_unlock(&mdsc->mutex);
5141bad:
5142 pr_err("error decoding mdsmap %d\n", err);
5143 return;
5144}
5145
4972cf60 5146static struct ceph_connection *mds_get_con(struct ceph_connection *con)
2f2dc053
SW		 5147{
5148 struct ceph_mds_session *s = con->private;
5149
5b3248c6 5150 if (ceph_get_mds_session(s))
2f2dc053 5151 return con;
2f2dc053
SW		 5152 return NULL;
5153}
5154
4972cf60 5155static void mds_put_con(struct ceph_connection *con)
2f2dc053
SW		 5156{
5157 struct ceph_mds_session *s = con->private;
5158
2f2dc053
SW		 5159 ceph_put_mds_session(s);
5160}
5161
5162/*
5163 * if the client is unresponsive for long enough, the mds will kill
5164 * the session entirely.
5165 */
4972cf60 5166static void mds_peer_reset(struct ceph_connection *con)
2f2dc053
SW		 5167{
5168 struct ceph_mds_session *s = con->private;
7e70f0ed 5169 struct ceph_mds_client *mdsc = s->s_mdsc;
2f2dc053 5170
f3ae1b97 5171 pr_warn("mds%d closed our session\n", s->s_mds);
7e70f0ed 5172 send_mds_reconnect(mdsc, s);
2f2dc053
SW		 5173}
5174
4972cf60 5175static void mds_dispatch(struct ceph_connection *con, struct ceph_msg *msg)
2f2dc053
SW		 5176{
5177 struct ceph_mds_session *s = con->private;
5178 struct ceph_mds_client *mdsc = s->s_mdsc;
5179 int type = le16_to_cpu(msg->hdr.type);
5180
2600d2dd
SW		 5181 mutex_lock(&mdsc->mutex);
5182 if (__verify_registered_session(mdsc, s) < 0) {
5183 mutex_unlock(&mdsc->mutex);
5184 goto out;
5185 }
5186 mutex_unlock(&mdsc->mutex);
5187
2f2dc053
SW		 5188 switch (type) {
5189 case CEPH_MSG_MDS_MAP:
430afbad
YZ		 5190 ceph_mdsc_handle_mdsmap(mdsc, msg);
5191 break;
5192 case CEPH_MSG_FS_MAP_USER:
5193 ceph_mdsc_handle_fsmap(mdsc, msg);
2f2dc053
SW		 5194 break;
5195 case CEPH_MSG_CLIENT_SESSION:
5196 handle_session(s, msg);
5197 break;
5198 case CEPH_MSG_CLIENT_REPLY:
5199 handle_reply(s, msg);
5200 break;
5201 case CEPH_MSG_CLIENT_REQUEST_FORWARD:
2600d2dd 5202 handle_forward(mdsc, s, msg);
2f2dc053
SW		 5203 break;
5204 case CEPH_MSG_CLIENT_CAPS:
5205 ceph_handle_caps(s, msg);
5206 break;
5207 case CEPH_MSG_CLIENT_SNAP:
2600d2dd 5208 ceph_handle_snap(mdsc, s, msg);
2f2dc053
SW		 5209 break;
5210 case CEPH_MSG_CLIENT_LEASE:
2600d2dd 5211 handle_lease(mdsc, s, msg);
2f2dc053 5212 break;
fb18a575
LH		 5213 case CEPH_MSG_CLIENT_QUOTA:
5214 ceph_handle_quota(mdsc, s, msg);
5215 break;
2f2dc053
SW		 5216
5217 default:
5218 pr_err("received unknown message type %d %s\n", type,
5219 ceph_msg_type_name(type));
5220 }
2600d2dd 5221out:
2f2dc053
SW		 5222 ceph_msg_put(msg);
5223}
5224
4e7a5dcd
SW		 5225/*
5226 * authentication
5227 */
a3530df3
AE		 5228
5229/*
5230 * Note: returned pointer is the address of a structure that's
5231 * managed separately. Caller must *not* attempt to free it.
5232 */
4972cf60
ID		 5233static struct ceph_auth_handshake *
5234mds_get_authorizer(struct ceph_connection *con, int *proto, int force_new)
4e7a5dcd
SW		 5235{
5236 struct ceph_mds_session *s = con->private;
5237 struct ceph_mds_client *mdsc = s->s_mdsc;
3d14c5d2 5238 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
74f1869f 5239 struct ceph_auth_handshake *auth = &s->s_auth;
ce287162 5240 int ret;
4e7a5dcd 5241
ce287162
ID		 5242 ret = __ceph_auth_get_authorizer(ac, auth, CEPH_ENTITY_TYPE_MDS,
5243 force_new, proto, NULL, NULL);
5244 if (ret)
5245 return ERR_PTR(ret);
74f1869f 5246
a3530df3 5247 return auth;
4e7a5dcd
SW		 5248}
5249
4972cf60 5250static int mds_add_authorizer_challenge(struct ceph_connection *con,
6daca13d
ID		 5251 void *challenge_buf, int challenge_buf_len)
5252{
5253 struct ceph_mds_session *s = con->private;
5254 struct ceph_mds_client *mdsc = s->s_mdsc;
5255 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
5256
5257 return ceph_auth_add_authorizer_challenge(ac, s->s_auth.authorizer,
5258 challenge_buf, challenge_buf_len);
5259}
4e7a5dcd 5260
4972cf60 5261static int mds_verify_authorizer_reply(struct ceph_connection *con)
4e7a5dcd
SW		 5262{
5263 struct ceph_mds_session *s = con->private;
5264 struct ceph_mds_client *mdsc = s->s_mdsc;
3d14c5d2 5265 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
285ea34f 5266 struct ceph_auth_handshake *auth = &s->s_auth;
4e7a5dcd 5267
285ea34f
ID		 5268 return ceph_auth_verify_authorizer_reply(ac, auth->authorizer,
5269 auth->authorizer_reply_buf, auth->authorizer_reply_buf_len,
5270 NULL, NULL, NULL, NULL);
4e7a5dcd
SW		 5271}
5272
4972cf60 5273static int mds_invalidate_authorizer(struct ceph_connection *con)
9bd2e6f8
SW		 5274{
5275 struct ceph_mds_session *s = con->private;
5276 struct ceph_mds_client *mdsc = s->s_mdsc;
3d14c5d2 5277 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
9bd2e6f8 5278
27859f97 5279 ceph_auth_invalidate_authorizer(ac, CEPH_ENTITY_TYPE_MDS);
9bd2e6f8 5280
3d14c5d2 5281 return ceph_monc_validate_auth(&mdsc->fsc->client->monc);
9bd2e6f8
SW		 5282}
5283
cd1a677c
ID		 5284static int mds_get_auth_request(struct ceph_connection *con,
5285 void *buf, int *buf_len,
5286 void **authorizer, int *authorizer_len)
5287{
5288 struct ceph_mds_session *s = con->private;
5289 struct ceph_auth_client *ac = s->s_mdsc->fsc->client->monc.auth;
5290 struct ceph_auth_handshake *auth = &s->s_auth;
5291 int ret;
5292
5293 ret = ceph_auth_get_authorizer(ac, auth, CEPH_ENTITY_TYPE_MDS,
5294 buf, buf_len);
5295 if (ret)
5296 return ret;
5297
5298 *authorizer = auth->authorizer_buf;
5299 *authorizer_len = auth->authorizer_buf_len;
5300 return 0;
5301}
5302
5303static int mds_handle_auth_reply_more(struct ceph_connection *con,
5304 void *reply, int reply_len,
5305 void *buf, int *buf_len,
5306 void **authorizer, int *authorizer_len)
5307{
5308 struct ceph_mds_session *s = con->private;
5309 struct ceph_auth_client *ac = s->s_mdsc->fsc->client->monc.auth;
5310 struct ceph_auth_handshake *auth = &s->s_auth;
5311 int ret;
5312
5313 ret = ceph_auth_handle_svc_reply_more(ac, auth, reply, reply_len,
5314 buf, buf_len);
5315 if (ret)
5316 return ret;
5317
5318 *authorizer = auth->authorizer_buf;
5319 *authorizer_len = auth->authorizer_buf_len;
5320 return 0;
5321}
5322
5323static int mds_handle_auth_done(struct ceph_connection *con,
5324 u64 global_id, void *reply, int reply_len,
5325 u8 *session_key, int *session_key_len,
5326 u8 *con_secret, int *con_secret_len)
5327{
5328 struct ceph_mds_session *s = con->private;
5329 struct ceph_auth_client *ac = s->s_mdsc->fsc->client->monc.auth;
5330 struct ceph_auth_handshake *auth = &s->s_auth;
5331
5332 return ceph_auth_handle_svc_reply_done(ac, auth, reply, reply_len,
5333 session_key, session_key_len,
5334 con_secret, con_secret_len);
5335}
5336
5337static int mds_handle_auth_bad_method(struct ceph_connection *con,
5338 int used_proto, int result,
5339 const int *allowed_protos, int proto_cnt,
5340 const int *allowed_modes, int mode_cnt)
5341{
5342 struct ceph_mds_session *s = con->private;
5343 struct ceph_mon_client *monc = &s->s_mdsc->fsc->client->monc;
5344 int ret;
5345
5346 if (ceph_auth_handle_bad_authorizer(monc->auth, CEPH_ENTITY_TYPE_MDS,
5347 used_proto, result,
5348 allowed_protos, proto_cnt,
5349 allowed_modes, mode_cnt)) {
5350 ret = ceph_monc_validate_auth(monc);
5351 if (ret)
5352 return ret;
5353 }
5354
5355 return -EACCES;
5356}
5357
53ded495
AE		 5358static struct ceph_msg *mds_alloc_msg(struct ceph_connection *con,
5359 struct ceph_msg_header *hdr, int *skip)
5360{
5361 struct ceph_msg *msg;
5362 int type = (int) le16_to_cpu(hdr->type);
5363 int front_len = (int) le32_to_cpu(hdr->front_len);
5364
5365 if (con->in_msg)
5366 return con->in_msg;
5367
5368 *skip = 0;
5369 msg = ceph_msg_new(type, front_len, GFP_NOFS, false);
5370 if (!msg) {
5371 pr_err("unable to allocate msg type %d len %d\n",
5372 type, front_len);
5373 return NULL;
5374 }
53ded495
AE		 5375
5376 return msg;
5377}
5378
79dbd1ba 5379static int mds_sign_message(struct ceph_msg *msg)
33d07337 5380{
79dbd1ba 5381 struct ceph_mds_session *s = msg->con->private;
33d07337 5382 struct ceph_auth_handshake *auth = &s->s_auth;
79dbd1ba 5383
33d07337
YZ		 5384 return ceph_auth_sign_message(auth, msg);
5385}
5386
79dbd1ba 5387static int mds_check_message_signature(struct ceph_msg *msg)
33d07337 5388{
79dbd1ba 5389 struct ceph_mds_session *s = msg->con->private;
33d07337 5390 struct ceph_auth_handshake *auth = &s->s_auth;
79dbd1ba 5391
33d07337
YZ		 5392 return ceph_auth_check_message_signature(auth, msg);
5393}
5394
9e32789f 5395static const struct ceph_connection_operations mds_con_ops = {
4972cf60
ID		 5396 .get = mds_get_con,
5397 .put = mds_put_con,
53ded495 5398 .alloc_msg = mds_alloc_msg,
4972cf60
ID		 5399 .dispatch = mds_dispatch,
5400 .peer_reset = mds_peer_reset,
5401 .get_authorizer = mds_get_authorizer,
5402 .add_authorizer_challenge = mds_add_authorizer_challenge,
5403 .verify_authorizer_reply = mds_verify_authorizer_reply,
5404 .invalidate_authorizer = mds_invalidate_authorizer,
79dbd1ba
ID		 5405 .sign_message = mds_sign_message,
5406 .check_message_signature = mds_check_message_signature,
cd1a677c
ID		 5407 .get_auth_request = mds_get_auth_request,
5408 .handle_auth_reply_more = mds_handle_auth_reply_more,
5409 .handle_auth_done = mds_handle_auth_done,
5410 .handle_auth_bad_method = mds_handle_auth_bad_method,
2f2dc053
SW		 5411};
5412
2f2dc053 5413/* eof */
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