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ALSA: hda - Fix pending unsol events at shutdown
[linux-2.6-block.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>
2f2dc053 12
2f2dc053 13#include "super.h"
3d14c5d2
YS		 14#include "mds_client.h"
15
1fe60e51 16#include <linux/ceph/ceph_features.h>
3d14c5d2
YS		 17#include <linux/ceph/messenger.h>
18#include <linux/ceph/decode.h>
19#include <linux/ceph/pagelist.h>
20#include <linux/ceph/auth.h>
21#include <linux/ceph/debugfs.h>
2f2dc053 22
81c5a148
YZ		 23#define RECONNECT_MAX_SIZE (INT_MAX - PAGE_SIZE)
24
2f2dc053
SW		 25/*
26 * A cluster of MDS (metadata server) daemons is responsible for
27 * managing the file system namespace (the directory hierarchy and
28 * inodes) and for coordinating shared access to storage. Metadata is
29 * partitioning hierarchically across a number of servers, and that
30 * partition varies over time as the cluster adjusts the distribution
31 * in order to balance load.
32 *
33 * The MDS client is primarily responsible to managing synchronous
34 * metadata requests for operations like open, unlink, and so forth.
35 * If there is a MDS failure, we find out about it when we (possibly
36 * request and) receive a new MDS map, and can resubmit affected
37 * requests.
38 *
39 * For the most part, though, we take advantage of a lossless
40 * communications channel to the MDS, and do not need to worry about
41 * timing out or resubmitting requests.
42 *
43 * We maintain a stateful "session" with each MDS we interact with.
44 * Within each session, we sent periodic heartbeat messages to ensure
45 * any capabilities or leases we have been issues remain valid. If
46 * the session times out and goes stale, our leases and capabilities
47 * are no longer valid.
48 */
49
20cb34ae 50struct ceph_reconnect_state {
81c5a148
YZ		 51 struct ceph_mds_session *session;
52 int nr_caps, nr_realms;
20cb34ae 53 struct ceph_pagelist *pagelist;
121f22a1 54 unsigned msg_version;
81c5a148 55 bool allow_multi;
20cb34ae
SW		 56};
57
2f2dc053
SW		 58static void __wake_requests(struct ceph_mds_client *mdsc,
59 struct list_head *head);
e3ec8d68 60static void ceph_cap_release_work(struct work_struct *work);
37c4efc1 61static void ceph_cap_reclaim_work(struct work_struct *work);
2f2dc053 62
9e32789f 63static const struct ceph_connection_operations mds_con_ops;
2f2dc053
SW		 64
65
66/*
67 * mds reply parsing
68 */
69
b37fe1f9
YZ		 70static int parse_reply_info_quota(void **p, void *end,
71 struct ceph_mds_reply_info_in *info)
72{
73 u8 struct_v, struct_compat;
74 u32 struct_len;
75
76 ceph_decode_8_safe(p, end, struct_v, bad);
77 ceph_decode_8_safe(p, end, struct_compat, bad);
78 /* struct_v is expected to be >= 1. we only
79 * understand encoding with struct_compat == 1. */
80 if (!struct_v || struct_compat != 1)
81 goto bad;
82 ceph_decode_32_safe(p, end, struct_len, bad);
83 ceph_decode_need(p, end, struct_len, bad);
84 end = *p + struct_len;
85 ceph_decode_64_safe(p, end, info->max_bytes, bad);
86 ceph_decode_64_safe(p, end, info->max_files, bad);
87 *p = end;
88 return 0;
89bad:
90 return -EIO;
91}
92
2f2dc053
SW		 93/*
94 * parse individual inode info
95 */
96static int parse_reply_info_in(void **p, void *end,
14303d20 97 struct ceph_mds_reply_info_in *info,
12b4629a 98 u64 features)
2f2dc053 99{
b37fe1f9
YZ		 100 int err = 0;
101 u8 struct_v = 0;
2f2dc053 102
b37fe1f9
YZ		 103 if (features == (u64)-1) {
104 u32 struct_len;
105 u8 struct_compat;
106 ceph_decode_8_safe(p, end, struct_v, bad);
107 ceph_decode_8_safe(p, end, struct_compat, bad);
108 /* struct_v is expected to be >= 1. we only understand
109 * encoding with struct_compat == 1. */
110 if (!struct_v || struct_compat != 1)
111 goto bad;
112 ceph_decode_32_safe(p, end, struct_len, bad);
113 ceph_decode_need(p, end, struct_len, bad);
114 end = *p + struct_len;
115 }
116
117 ceph_decode_need(p, end, sizeof(struct ceph_mds_reply_inode), bad);
2f2dc053
SW		 118 info->in = *p;
119 *p += sizeof(struct ceph_mds_reply_inode) +
120 sizeof(*info->in->fragtree.splits) *
121 le32_to_cpu(info->in->fragtree.nsplits);
122
123 ceph_decode_32_safe(p, end, info->symlink_len, bad);
124 ceph_decode_need(p, end, info->symlink_len, bad);
125 info->symlink = *p;
126 *p += info->symlink_len;
127
23c625ce
ID		 128 ceph_decode_copy_safe(p, end, &info->dir_layout,
129 sizeof(info->dir_layout), bad);
2f2dc053
SW		 130 ceph_decode_32_safe(p, end, info->xattr_len, bad);
131 ceph_decode_need(p, end, info->xattr_len, bad);
132 info->xattr_data = *p;
133 *p += info->xattr_len;
fb01d1f8 134
b37fe1f9
YZ		 135 if (features == (u64)-1) {
136 /* inline data */
fb01d1f8
YZ		 137 ceph_decode_64_safe(p, end, info->inline_version, bad);
138 ceph_decode_32_safe(p, end, info->inline_len, bad);
139 ceph_decode_need(p, end, info->inline_len, bad);
140 info->inline_data = *p;
141 *p += info->inline_len;
b37fe1f9
YZ		 142 /* quota */
143 err = parse_reply_info_quota(p, end, info);
144 if (err < 0)
145 goto out_bad;
146 /* pool namespace */
147 ceph_decode_32_safe(p, end, info->pool_ns_len, bad);
148 if (info->pool_ns_len > 0) {
149 ceph_decode_need(p, end, info->pool_ns_len, bad);
150 info->pool_ns_data = *p;
151 *p += info->pool_ns_len;
152 }
245ce991
JL		 153
154 /* btime */
155 ceph_decode_need(p, end, sizeof(info->btime), bad);
156 ceph_decode_copy(p, &info->btime, sizeof(info->btime));
157
158 /* change attribute */
a35ead31 159 ceph_decode_64_safe(p, end, info->change_attr, bad);
fb01d1f8 160
08796873
YZ		 161 /* dir pin */
162 if (struct_v >= 2) {
163 ceph_decode_32_safe(p, end, info->dir_pin, bad);
164 } else {
165 info->dir_pin = -ENODATA;
166 }
167
193e7b37
DD		 168 /* snapshot birth time, remains zero for v<=2 */
169 if (struct_v >= 3) {
170 ceph_decode_need(p, end, sizeof(info->snap_btime), bad);
171 ceph_decode_copy(p, &info->snap_btime,
172 sizeof(info->snap_btime));
173 } else {
174 memset(&info->snap_btime, 0, sizeof(info->snap_btime));
175 }
176
b37fe1f9
YZ		 177 *p = end;
178 } else {
179 if (features & CEPH_FEATURE_MDS_INLINE_DATA) {
180 ceph_decode_64_safe(p, end, info->inline_version, bad);
181 ceph_decode_32_safe(p, end, info->inline_len, bad);
182 ceph_decode_need(p, end, info->inline_len, bad);
183 info->inline_data = *p;
184 *p += info->inline_len;
185 } else
186 info->inline_version = CEPH_INLINE_NONE;
187
188 if (features & CEPH_FEATURE_MDS_QUOTA) {
189 err = parse_reply_info_quota(p, end, info);
190 if (err < 0)
191 goto out_bad;
192 } else {
193 info->max_bytes = 0;
194 info->max_files = 0;
195 }
196
197 info->pool_ns_len = 0;
198 info->pool_ns_data = NULL;
199 if (features & CEPH_FEATURE_FS_FILE_LAYOUT_V2) {
200 ceph_decode_32_safe(p, end, info->pool_ns_len, bad);
201 if (info->pool_ns_len > 0) {
202 ceph_decode_need(p, end, info->pool_ns_len, bad);
203 info->pool_ns_data = *p;
204 *p += info->pool_ns_len;
205 }
206 }
08796873 207
245ce991
JL		 208 if (features & CEPH_FEATURE_FS_BTIME) {
209 ceph_decode_need(p, end, sizeof(info->btime), bad);
210 ceph_decode_copy(p, &info->btime, sizeof(info->btime));
a35ead31 211 ceph_decode_64_safe(p, end, info->change_attr, bad);
245ce991
JL		 212 }
213
08796873 214 info->dir_pin = -ENODATA;
193e7b37 215 /* info->snap_btime remains zero */
b37fe1f9
YZ		 216 }
217 return 0;
218bad:
219 err = -EIO;
220out_bad:
221 return err;
222}
223
224static int parse_reply_info_dir(void **p, void *end,
225 struct ceph_mds_reply_dirfrag **dirfrag,
226 u64 features)
227{
228 if (features == (u64)-1) {
fb18a575
LH		 229 u8 struct_v, struct_compat;
230 u32 struct_len;
fb18a575
LH		 231 ceph_decode_8_safe(p, end, struct_v, bad);
232 ceph_decode_8_safe(p, end, struct_compat, bad);
b37fe1f9
YZ		 233 /* struct_v is expected to be >= 1. we only understand
234 * encoding whose struct_compat == 1. */
235 if (!struct_v || struct_compat != 1)
fb18a575
LH		 236 goto bad;
237 ceph_decode_32_safe(p, end, struct_len, bad);
238 ceph_decode_need(p, end, struct_len, bad);
b37fe1f9 239 end = *p + struct_len;
fb18a575
LH		 240 }
241
b37fe1f9
YZ		 242 ceph_decode_need(p, end, sizeof(**dirfrag), bad);
243 *dirfrag = *p;
244 *p += sizeof(**dirfrag) + sizeof(u32) * le32_to_cpu((*dirfrag)->ndist);
245 if (unlikely(*p > end))
246 goto bad;
247 if (features == (u64)-1)
248 *p = end;
249 return 0;
250bad:
251 return -EIO;
252}
253
254static int parse_reply_info_lease(void **p, void *end,
255 struct ceph_mds_reply_lease **lease,
256 u64 features)
257{
258 if (features == (u64)-1) {
259 u8 struct_v, struct_compat;
260 u32 struct_len;
261 ceph_decode_8_safe(p, end, struct_v, bad);
262 ceph_decode_8_safe(p, end, struct_compat, bad);
263 /* struct_v is expected to be >= 1. we only understand
264 * encoding whose struct_compat == 1. */
265 if (!struct_v || struct_compat != 1)
266 goto bad;
267 ceph_decode_32_safe(p, end, struct_len, bad);
268 ceph_decode_need(p, end, struct_len, bad);
269 end = *p + struct_len;
5ea5c5e0
YZ		 270 }
271
b37fe1f9
YZ		 272 ceph_decode_need(p, end, sizeof(**lease), bad);
273 *lease = *p;
274 *p += sizeof(**lease);
275 if (features == (u64)-1)
276 *p = end;
2f2dc053
SW		 277 return 0;
278bad:
b37fe1f9 279 return -EIO;
2f2dc053
SW		 280}
281
282/*
283 * parse a normal reply, which may contain a (dir+)dentry and/or a
284 * target inode.
285 */
286static int parse_reply_info_trace(void **p, void *end,
14303d20 287 struct ceph_mds_reply_info_parsed *info,
12b4629a 288 u64 features)
2f2dc053
SW		 289{
290 int err;
291
292 if (info->head->is_dentry) {
14303d20 293 err = parse_reply_info_in(p, end, &info->diri, features);
2f2dc053
SW		 294 if (err < 0)
295 goto out_bad;
296
b37fe1f9
YZ		 297 err = parse_reply_info_dir(p, end, &info->dirfrag, features);
298 if (err < 0)
299 goto out_bad;
2f2dc053
SW		 300
301 ceph_decode_32_safe(p, end, info->dname_len, bad);
302 ceph_decode_need(p, end, info->dname_len, bad);
303 info->dname = *p;
304 *p += info->dname_len;
b37fe1f9
YZ		 305
306 err = parse_reply_info_lease(p, end, &info->dlease, features);
307 if (err < 0)
308 goto out_bad;
2f2dc053
SW		 309 }
310
311 if (info->head->is_target) {
14303d20 312 err = parse_reply_info_in(p, end, &info->targeti, features);
2f2dc053
SW		 313 if (err < 0)
314 goto out_bad;
315 }
316
317 if (unlikely(*p != end))
318 goto bad;
319 return 0;
320
321bad:
322 err = -EIO;
323out_bad:
324 pr_err("problem parsing mds trace %d\n", err);
325 return err;
326}
327
328/*
329 * parse readdir results
330 */
b37fe1f9 331static int parse_reply_info_readdir(void **p, void *end,
14303d20 332 struct ceph_mds_reply_info_parsed *info,
12b4629a 333 u64 features)
2f2dc053
SW		 334{
335 u32 num, i = 0;
336 int err;
337
b37fe1f9
YZ		 338 err = parse_reply_info_dir(p, end, &info->dir_dir, features);
339 if (err < 0)
340 goto out_bad;
2f2dc053
SW		 341
342 ceph_decode_need(p, end, sizeof(num) + 2, bad);
c89136ea 343 num = ceph_decode_32(p);
956d39d6
YZ		 344 {
345 u16 flags = ceph_decode_16(p);
346 info->dir_end = !!(flags & CEPH_READDIR_FRAG_END);
347 info->dir_complete = !!(flags & CEPH_READDIR_FRAG_COMPLETE);
f3c4ebe6 348 info->hash_order = !!(flags & CEPH_READDIR_HASH_ORDER);
79162547 349 info->offset_hash = !!(flags & CEPH_READDIR_OFFSET_HASH);
956d39d6 350 }
2f2dc053
SW		 351 if (num == 0)
352 goto done;
353
2a5beea3
YZ		 354 BUG_ON(!info->dir_entries);
355 if ((unsigned long)(info->dir_entries + num) >
356 (unsigned long)info->dir_entries + info->dir_buf_size) {
54008399
YZ		 357 pr_err("dir contents are larger than expected\n");
358 WARN_ON(1);
359 goto bad;
360 }
2f2dc053 361
54008399 362 info->dir_nr = num;
2f2dc053 363 while (num) {
2a5beea3 364 struct ceph_mds_reply_dir_entry *rde = info->dir_entries + i;
2f2dc053 365 /* dentry */
b37fe1f9 366 ceph_decode_32_safe(p, end, rde->name_len, bad);
2a5beea3
YZ		 367 ceph_decode_need(p, end, rde->name_len, bad);
368 rde->name = *p;
369 *p += rde->name_len;
370 dout("parsed dir dname '%.*s'\n", rde->name_len, rde->name);
2f2dc053 371
b37fe1f9
YZ		 372 /* dentry lease */
373 err = parse_reply_info_lease(p, end, &rde->lease, features);
374 if (err)
375 goto out_bad;
2f2dc053 376 /* inode */
2a5beea3 377 err = parse_reply_info_in(p, end, &rde->inode, features);
2f2dc053
SW		 378 if (err < 0)
379 goto out_bad;
8974eebd
YZ		 380 /* ceph_readdir_prepopulate() will update it */
381 rde->offset = 0;
2f2dc053
SW		 382 i++;
383 num--;
384 }
385
386done:
387 if (*p != end)
388 goto bad;
389 return 0;
390
391bad:
392 err = -EIO;
393out_bad:
394 pr_err("problem parsing dir contents %d\n", err);
395 return err;
396}
397
25933abd
HS		 398/*
399 * parse fcntl F_GETLK results
400 */
401static int parse_reply_info_filelock(void **p, void *end,
14303d20 402 struct ceph_mds_reply_info_parsed *info,
12b4629a 403 u64 features)
25933abd
HS		 404{
405 if (*p + sizeof(*info->filelock_reply) > end)
406 goto bad;
407
408 info->filelock_reply = *p;
409 *p += sizeof(*info->filelock_reply);
410
411 if (unlikely(*p != end))
412 goto bad;
413 return 0;
414
415bad:
416 return -EIO;
417}
418
6e8575fa
SL		 419/*
420 * parse create results
421 */
422static int parse_reply_info_create(void **p, void *end,
423 struct ceph_mds_reply_info_parsed *info,
12b4629a 424 u64 features)
6e8575fa 425{
b37fe1f9
YZ		 426 if (features == (u64)-1 ||
427 (features & CEPH_FEATURE_REPLY_CREATE_INODE)) {
6e8575fa
SL		 428 if (*p == end) {
429 info->has_create_ino = false;
430 } else {
431 info->has_create_ino = true;
432 info->ino = ceph_decode_64(p);
433 }
434 }
435
436 if (unlikely(*p != end))
437 goto bad;
438 return 0;
439
440bad:
441 return -EIO;
442}
443
25933abd
HS		 444/*
445 * parse extra results
446 */
447static int parse_reply_info_extra(void **p, void *end,
14303d20 448 struct ceph_mds_reply_info_parsed *info,
12b4629a 449 u64 features)
25933abd 450{
6df8c9d8
JL		 451 u32 op = le32_to_cpu(info->head->op);
452
453 if (op == CEPH_MDS_OP_GETFILELOCK)
14303d20 454 return parse_reply_info_filelock(p, end, info, features);
6df8c9d8 455 else if (op == CEPH_MDS_OP_READDIR || op == CEPH_MDS_OP_LSSNAP)
b37fe1f9 456 return parse_reply_info_readdir(p, end, info, features);
6df8c9d8 457 else if (op == CEPH_MDS_OP_CREATE)
6e8575fa
SL		 458 return parse_reply_info_create(p, end, info, features);
459 else
460 return -EIO;
25933abd
HS		 461}
462
2f2dc053
SW		 463/*
464 * parse entire mds reply
465 */
466static int parse_reply_info(struct ceph_msg *msg,
14303d20 467 struct ceph_mds_reply_info_parsed *info,
12b4629a 468 u64 features)
2f2dc053
SW		 469{
470 void *p, *end;
471 u32 len;
472 int err;
473
474 info->head = msg->front.iov_base;
475 p = msg->front.iov_base + sizeof(struct ceph_mds_reply_head);
476 end = p + msg->front.iov_len - sizeof(struct ceph_mds_reply_head);
477
478 /* trace */
479 ceph_decode_32_safe(&p, end, len, bad);
480 if (len > 0) {
32852a81 481 ceph_decode_need(&p, end, len, bad);
14303d20 482 err = parse_reply_info_trace(&p, p+len, info, features);
2f2dc053
SW		 483 if (err < 0)
484 goto out_bad;
485 }
486
25933abd 487 /* extra */
2f2dc053
SW		 488 ceph_decode_32_safe(&p, end, len, bad);
489 if (len > 0) {
32852a81 490 ceph_decode_need(&p, end, len, bad);
14303d20 491 err = parse_reply_info_extra(&p, p+len, info, features);
2f2dc053
SW		 492 if (err < 0)
493 goto out_bad;
494 }
495
496 /* snap blob */
497 ceph_decode_32_safe(&p, end, len, bad);
498 info->snapblob_len = len;
499 info->snapblob = p;
500 p += len;
501
502 if (p != end)
503 goto bad;
504 return 0;
505
506bad:
507 err = -EIO;
508out_bad:
509 pr_err("mds parse_reply err %d\n", err);
510 return err;
511}
512
513static void destroy_reply_info(struct ceph_mds_reply_info_parsed *info)
514{
2a5beea3 515 if (!info->dir_entries)
54008399 516 return;
2a5beea3 517 free_pages((unsigned long)info->dir_entries, get_order(info->dir_buf_size));
2f2dc053
SW		 518}
519
520
521/*
522 * sessions
523 */
a687ecaf 524const char *ceph_session_state_name(int s)
2f2dc053
SW		 525{
526 switch (s) {
527 case CEPH_MDS_SESSION_NEW: return "new";
528 case CEPH_MDS_SESSION_OPENING: return "opening";
529 case CEPH_MDS_SESSION_OPEN: return "open";
530 case CEPH_MDS_SESSION_HUNG: return "hung";
531 case CEPH_MDS_SESSION_CLOSING: return "closing";
44ca18f2 532 case CEPH_MDS_SESSION_RESTARTING: return "restarting";
2f2dc053 533 case CEPH_MDS_SESSION_RECONNECTING: return "reconnecting";
fcff415c 534 case CEPH_MDS_SESSION_REJECTED: return "rejected";
2f2dc053
SW		 535 default: return "???";
536 }
537}
538
539static struct ceph_mds_session *get_session(struct ceph_mds_session *s)
540{
3997c01d 541 if (refcount_inc_not_zero(&s->s_ref)) {
2f2dc053 542 dout("mdsc get_session %p %d -> %d\n", s,
3997c01d 543 refcount_read(&s->s_ref)-1, refcount_read(&s->s_ref));
2f2dc053
SW		 544 return s;
545 } else {
4c069a58 546 dout("mdsc get_session %p 0 -- FAIL\n", s);
2f2dc053
SW		 547 return NULL;
548 }
549}
550
551void ceph_put_mds_session(struct ceph_mds_session *s)
552{
553 dout("mdsc put_session %p %d -> %d\n", s,
3997c01d
ER		 554 refcount_read(&s->s_ref), refcount_read(&s->s_ref)-1);
555 if (refcount_dec_and_test(&s->s_ref)) {
6c4a1915 556 if (s->s_auth.authorizer)
6c1ea260 557 ceph_auth_destroy_authorizer(s->s_auth.authorizer);
2f2dc053 558 kfree(s);
4e7a5dcd 559 }
2f2dc053
SW		 560}
561
562/*
563 * called under mdsc->mutex
564 */
565struct ceph_mds_session *__ceph_lookup_mds_session(struct ceph_mds_client *mdsc,
566 int mds)
567{
d37b1d99 568 if (mds >= mdsc->max_sessions || !mdsc->sessions[mds])
2f2dc053 569 return NULL;
488f5284 570 return get_session(mdsc->sessions[mds]);
2f2dc053
SW		 571}
572
573static bool __have_session(struct ceph_mds_client *mdsc, int mds)
574{
98cfda81 575 if (mds >= mdsc->max_sessions || !mdsc->sessions[mds])
2f2dc053 576 return false;
98cfda81
CX		 577 else
578 return true;
2f2dc053
SW		 579}
580
2600d2dd
SW		 581static int __verify_registered_session(struct ceph_mds_client *mdsc,
582 struct ceph_mds_session *s)
583{
584 if (s->s_mds >= mdsc->max_sessions ||
585 mdsc->sessions[s->s_mds] != s)
586 return -ENOENT;
587 return 0;
588}
589
2f2dc053
SW		 590/*
591 * create+register a new session for given mds.
592 * called under mdsc->mutex.
593 */
594static struct ceph_mds_session *register_session(struct ceph_mds_client *mdsc,
595 int mds)
596{
597 struct ceph_mds_session *s;
598
76201b63 599 if (mds >= mdsc->mdsmap->m_num_mds)
c338c07c
NY		 600 return ERR_PTR(-EINVAL);
601
2f2dc053 602 s = kzalloc(sizeof(*s), GFP_NOFS);
4736b009
DC		 603 if (!s)
604 return ERR_PTR(-ENOMEM);
47474d0b
CX		 605
606 if (mds >= mdsc->max_sessions) {
607 int newmax = 1 << get_count_order(mds + 1);
608 struct ceph_mds_session **sa;
609
610 dout("%s: realloc to %d\n", __func__, newmax);
611 sa = kcalloc(newmax, sizeof(void *), GFP_NOFS);
612 if (!sa)
613 goto fail_realloc;
614 if (mdsc->sessions) {
615 memcpy(sa, mdsc->sessions,
616 mdsc->max_sessions * sizeof(void *));
617 kfree(mdsc->sessions);
618 }
619 mdsc->sessions = sa;
620 mdsc->max_sessions = newmax;
621 }
622
623 dout("%s: mds%d\n", __func__, mds);
2f2dc053
SW		 624 s->s_mdsc = mdsc;
625 s->s_mds = mds;
626 s->s_state = CEPH_MDS_SESSION_NEW;
627 s->s_ttl = 0;
628 s->s_seq = 0;
629 mutex_init(&s->s_mutex);
630
b7a9e5dd 631 ceph_con_init(&s->s_con, s, &mds_con_ops, &mdsc->fsc->client->msgr);
2f2dc053 632
d8fb02ab 633 spin_lock_init(&s->s_gen_ttl_lock);
1e9c2eb6 634 s->s_cap_gen = 1;
1ce208a6 635 s->s_cap_ttl = jiffies - 1;
d8fb02ab
AE		 636
637 spin_lock_init(&s->s_cap_lock);
2f2dc053
SW		 638 s->s_renew_requested = 0;
639 s->s_renew_seq = 0;
640 INIT_LIST_HEAD(&s->s_caps);
641 s->s_nr_caps = 0;
3997c01d 642 refcount_set(&s->s_ref, 1);
2f2dc053
SW		 643 INIT_LIST_HEAD(&s->s_waiting);
644 INIT_LIST_HEAD(&s->s_unsafe);
645 s->s_num_cap_releases = 0;
99a9c273 646 s->s_cap_reconnect = 0;
7c1332b8 647 s->s_cap_iterator = NULL;
2f2dc053 648 INIT_LIST_HEAD(&s->s_cap_releases);
e3ec8d68
YZ		 649 INIT_WORK(&s->s_cap_release_work, ceph_cap_release_work);
650
2f2dc053 651 INIT_LIST_HEAD(&s->s_cap_flushing);
2f2dc053 652
2f2dc053 653 mdsc->sessions[mds] = s;
86d8f67b 654 atomic_inc(&mdsc->num_sessions);
3997c01d 655 refcount_inc(&s->s_ref); /* one ref to sessions[], one to caller */
42ce56e5 656
b7a9e5dd
SW		 657 ceph_con_open(&s->s_con, CEPH_ENTITY_TYPE_MDS, mds,
658 ceph_mdsmap_get_addr(mdsc->mdsmap, mds));
42ce56e5 659
2f2dc053 660 return s;
42ce56e5
SW		 661
662fail_realloc:
663 kfree(s);
664 return ERR_PTR(-ENOMEM);
2f2dc053
SW		 665}
666
667/*
668 * called under mdsc->mutex
669 */
2600d2dd 670static void __unregister_session(struct ceph_mds_client *mdsc,
42ce56e5 671 struct ceph_mds_session *s)
2f2dc053 672{
2600d2dd
SW		 673 dout("__unregister_session mds%d %p\n", s->s_mds, s);
674 BUG_ON(mdsc->sessions[s->s_mds] != s);
42ce56e5 675 mdsc->sessions[s->s_mds] = NULL;
e3ec8d68 676 s->s_state = 0;
42ce56e5
SW		 677 ceph_con_close(&s->s_con);
678 ceph_put_mds_session(s);
86d8f67b 679 atomic_dec(&mdsc->num_sessions);
2f2dc053
SW		 680}
681
682/*
683 * drop session refs in request.
684 *
685 * should be last request ref, or hold mdsc->mutex
686 */
687static void put_request_session(struct ceph_mds_request *req)
688{
689 if (req->r_session) {
690 ceph_put_mds_session(req->r_session);
691 req->r_session = NULL;
692 }
693}
694
153c8e6b 695void ceph_mdsc_release_request(struct kref *kref)
2f2dc053 696{
153c8e6b
SW		 697 struct ceph_mds_request *req = container_of(kref,
698 struct ceph_mds_request,
699 r_kref);
54008399 700 destroy_reply_info(&req->r_reply_info);
153c8e6b
SW		 701 if (req->r_request)
702 ceph_msg_put(req->r_request);
54008399 703 if (req->r_reply)
153c8e6b 704 ceph_msg_put(req->r_reply);
153c8e6b 705 if (req->r_inode) {
41b02e1f 706 ceph_put_cap_refs(ceph_inode(req->r_inode), CEPH_CAP_PIN);
3e1d0452
YZ		 707 /* avoid calling iput_final() in mds dispatch threads */
708 ceph_async_iput(req->r_inode);
153c8e6b 709 }
3dd69aab
JL		 710 if (req->r_parent)
711 ceph_put_cap_refs(ceph_inode(req->r_parent), CEPH_CAP_PIN);
3e1d0452 712 ceph_async_iput(req->r_target_inode);
153c8e6b
SW		 713 if (req->r_dentry)
714 dput(req->r_dentry);
844d87c3
SW		 715 if (req->r_old_dentry)
716 dput(req->r_old_dentry);
717 if (req->r_old_dentry_dir) {
41b02e1f
SW		 718 /*
719 * track (and drop pins for) r_old_dentry_dir
720 * separately, since r_old_dentry's d_parent may have
721 * changed between the dir mutex being dropped and
722 * this request being freed.
723 */
724 ceph_put_cap_refs(ceph_inode(req->r_old_dentry_dir),
725 CEPH_CAP_PIN);
3e1d0452 726 ceph_async_iput(req->r_old_dentry_dir);
2f2dc053 727 }
153c8e6b
SW		 728 kfree(req->r_path1);
729 kfree(req->r_path2);
25e6bae3
YZ		 730 if (req->r_pagelist)
731 ceph_pagelist_release(req->r_pagelist);
153c8e6b 732 put_request_session(req);
37151668 733 ceph_unreserve_caps(req->r_mdsc, &req->r_caps_reservation);
428138c9 734 WARN_ON_ONCE(!list_empty(&req->r_wait));
153c8e6b 735 kfree(req);
2f2dc053
SW		 736}
737
fcd00b68
ID		 738DEFINE_RB_FUNCS(request, struct ceph_mds_request, r_tid, r_node)
739
2f2dc053
SW		 740/*
741 * lookup session, bump ref if found.
742 *
743 * called under mdsc->mutex.
744 */
fcd00b68
ID		 745static struct ceph_mds_request *
746lookup_get_request(struct ceph_mds_client *mdsc, u64 tid)
2f2dc053
SW		 747{
748 struct ceph_mds_request *req;
44ca18f2 749
fcd00b68
ID		 750 req = lookup_request(&mdsc->request_tree, tid);
751 if (req)
752 ceph_mdsc_get_request(req);
44ca18f2 753
fcd00b68 754 return req;
2f2dc053
SW		 755}
756
757/*
758 * Register an in-flight request, and assign a tid. Link to directory
759 * are modifying (if any).
760 *
761 * Called under mdsc->mutex.
762 */
763static void __register_request(struct ceph_mds_client *mdsc,
764 struct ceph_mds_request *req,
765 struct inode *dir)
766{
e30ee581
ZZ		 767 int ret = 0;
768
2f2dc053 769 req->r_tid = ++mdsc->last_tid;
e30ee581
ZZ		 770 if (req->r_num_caps) {
771 ret = ceph_reserve_caps(mdsc, &req->r_caps_reservation,
772 req->r_num_caps);
773 if (ret < 0) {
774 pr_err("__register_request %p "
775 "failed to reserve caps: %d\n", req, ret);
776 /* set req->r_err to fail early from __do_request */
777 req->r_err = ret;
778 return;
779 }
780 }
2f2dc053
SW		 781 dout("__register_request %p tid %lld\n", req, req->r_tid);
782 ceph_mdsc_get_request(req);
fcd00b68 783 insert_request(&mdsc->request_tree, req);
2f2dc053 784
cb4276cc
SW		 785 req->r_uid = current_fsuid();
786 req->r_gid = current_fsgid();
787
e8a7b8b1
YZ		 788 if (mdsc->oldest_tid == 0 && req->r_op != CEPH_MDS_OP_SETFILELOCK)
789 mdsc->oldest_tid = req->r_tid;
790
2f2dc053 791 if (dir) {
3b663780 792 ihold(dir);
2f2dc053 793 req->r_unsafe_dir = dir;
2f2dc053
SW		 794 }
795}
796
797static void __unregister_request(struct ceph_mds_client *mdsc,
798 struct ceph_mds_request *req)
799{
800 dout("__unregister_request %p tid %lld\n", req, req->r_tid);
e8a7b8b1 801
df963ea8
JL		 802 /* Never leave an unregistered request on an unsafe list! */
803 list_del_init(&req->r_unsafe_item);
804
e8a7b8b1
YZ		 805 if (req->r_tid == mdsc->oldest_tid) {
806 struct rb_node *p = rb_next(&req->r_node);
807 mdsc->oldest_tid = 0;
808 while (p) {
809 struct ceph_mds_request *next_req =
810 rb_entry(p, struct ceph_mds_request, r_node);
811 if (next_req->r_op != CEPH_MDS_OP_SETFILELOCK) {
812 mdsc->oldest_tid = next_req->r_tid;
813 break;
814 }
815 p = rb_next(p);
816 }
817 }
818
fcd00b68 819 erase_request(&mdsc->request_tree, req);
2f2dc053 820
bc2de10d
JL		 821 if (req->r_unsafe_dir &&
822 test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) {
2f2dc053 823 struct ceph_inode_info *ci = ceph_inode(req->r_unsafe_dir);
2f2dc053
SW		 824 spin_lock(&ci->i_unsafe_lock);
825 list_del_init(&req->r_unsafe_dir_item);
826 spin_unlock(&ci->i_unsafe_lock);
4c06ace8 827 }
bc2de10d
JL		 828 if (req->r_target_inode &&
829 test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) {
68cd5b4b
YZ		 830 struct ceph_inode_info *ci = ceph_inode(req->r_target_inode);
831 spin_lock(&ci->i_unsafe_lock);
832 list_del_init(&req->r_unsafe_target_item);
833 spin_unlock(&ci->i_unsafe_lock);
834 }
3b663780 835
4c06ace8 836 if (req->r_unsafe_dir) {
3e1d0452
YZ		 837 /* avoid calling iput_final() in mds dispatch threads */
838 ceph_async_iput(req->r_unsafe_dir);
3b663780 839 req->r_unsafe_dir = NULL;
2f2dc053 840 }
94aa8ae1 841
fc55d2c9
YZ		 842 complete_all(&req->r_safe_completion);
843
94aa8ae1 844 ceph_mdsc_put_request(req);
2f2dc053
SW		 845}
846
30c71233
JL		 847/*
848 * Walk back up the dentry tree until we hit a dentry representing a
849 * non-snapshot inode. We do this using the rcu_read_lock (which must be held
850 * when calling this) to ensure that the objects won't disappear while we're
851 * working with them. Once we hit a candidate dentry, we attempt to take a
852 * reference to it, and return that as the result.
853 */
f1075480
DC		 854static struct inode *get_nonsnap_parent(struct dentry *dentry)
855{
856 struct inode *inode = NULL;
30c71233
JL		 857
858 while (dentry && !IS_ROOT(dentry)) {
859 inode = d_inode_rcu(dentry);
860 if (!inode || ceph_snap(inode) == CEPH_NOSNAP)
861 break;
862 dentry = dentry->d_parent;
863 }
864 if (inode)
865 inode = igrab(inode);
866 return inode;
867}
868
2f2dc053
SW		 869/*
870 * Choose mds to send request to next. If there is a hint set in the
871 * request (e.g., due to a prior forward hint from the mds), use that.
872 * Otherwise, consult frag tree and/or caps to identify the
873 * appropriate mds. If all else fails, choose randomly.
874 *
875 * Called under mdsc->mutex.
876 */
877static int __choose_mds(struct ceph_mds_client *mdsc,
878 struct ceph_mds_request *req)
879{
880 struct inode *inode;
881 struct ceph_inode_info *ci;
882 struct ceph_cap *cap;
883 int mode = req->r_direct_mode;
884 int mds = -1;
885 u32 hash = req->r_direct_hash;
bc2de10d 886 bool is_hash = test_bit(CEPH_MDS_R_DIRECT_IS_HASH, &req->r_req_flags);
2f2dc053
SW		 887
888 /*
889 * is there a specific mds we should try? ignore hint if we have
890 * no session and the mds is not up (active or recovering).
891 */
892 if (req->r_resend_mds >= 0 &&
893 (__have_session(mdsc, req->r_resend_mds) ||
894 ceph_mdsmap_get_state(mdsc->mdsmap, req->r_resend_mds) > 0)) {
895 dout("choose_mds using resend_mds mds%d\n",
896 req->r_resend_mds);
897 return req->r_resend_mds;
898 }
899
900 if (mode == USE_RANDOM_MDS)
901 goto random;
902
903 inode = NULL;
904 if (req->r_inode) {
5d37ca14
YZ		 905 if (ceph_snap(req->r_inode) != CEPH_SNAPDIR) {
906 inode = req->r_inode;
907 ihold(inode);
908 } else {
38f340cc
YZ		 909 /* req->r_dentry is non-null for LSSNAP request */
910 rcu_read_lock();
911 inode = get_nonsnap_parent(req->r_dentry);
912 rcu_read_unlock();
913 dout("__choose_mds using snapdir's parent %p\n", inode);
5d37ca14 914 }
38f340cc 915 } else if (req->r_dentry) {
d79698da 916 /* ignore race with rename; old or new d_parent is okay */
30c71233
JL		 917 struct dentry *parent;
918 struct inode *dir;
919
920 rcu_read_lock();
41883ba8 921 parent = READ_ONCE(req->r_dentry->d_parent);
3dd69aab 922 dir = req->r_parent ? : d_inode_rcu(parent);
eb6bb1c5 923
30c71233
JL		 924 if (!dir || dir->i_sb != mdsc->fsc->sb) {
925 /* not this fs or parent went negative */
2b0143b5 926 inode = d_inode(req->r_dentry);
30c71233
JL		 927 if (inode)
928 ihold(inode);
eb6bb1c5
SW		 929 } else if (ceph_snap(dir) != CEPH_NOSNAP) {
930 /* direct snapped/virtual snapdir requests
931 * based on parent dir inode */
30c71233 932 inode = get_nonsnap_parent(parent);
eb6bb1c5 933 dout("__choose_mds using nonsnap parent %p\n", inode);
ca18bede 934 } else {
eb6bb1c5 935 /* dentry target */
2b0143b5 936 inode = d_inode(req->r_dentry);
ca18bede
YZ		 937 if (!inode || mode == USE_AUTH_MDS) {
938 /* dir + name */
30c71233 939 inode = igrab(dir);
ca18bede
YZ		 940 hash = ceph_dentry_hash(dir, req->r_dentry);
941 is_hash = true;
30c71233
JL		 942 } else {
943 ihold(inode);
ca18bede 944 }
2f2dc053 945 }
30c71233 946 rcu_read_unlock();
2f2dc053 947 }
eb6bb1c5 948
2f2dc053
SW		 949 dout("__choose_mds %p is_hash=%d (%d) mode %d\n", inode, (int)is_hash,
950 (int)hash, mode);
951 if (!inode)
952 goto random;
953 ci = ceph_inode(inode);
954
955 if (is_hash && S_ISDIR(inode->i_mode)) {
956 struct ceph_inode_frag frag;
957 int found;
958
959 ceph_choose_frag(ci, hash, &frag, &found);
960 if (found) {
961 if (mode == USE_ANY_MDS && frag.ndist > 0) {
962 u8 r;
963
964 /* choose a random replica */
965 get_random_bytes(&r, 1);
966 r %= frag.ndist;
967 mds = frag.dist[r];
968 dout("choose_mds %p %llx.%llx "
969 "frag %u mds%d (%d/%d)\n",
970 inode, ceph_vinop(inode),
d66bbd44 971 frag.frag, mds,
2f2dc053 972 (int)r, frag.ndist);
d66bbd44
SW		 973 if (ceph_mdsmap_get_state(mdsc->mdsmap, mds) >=
974 CEPH_MDS_STATE_ACTIVE)
30c71233 975 goto out;
2f2dc053
SW		 976 }
977
978 /* since this file/dir wasn't known to be
979 * replicated, then we want to look for the
980 * authoritative mds. */
981 mode = USE_AUTH_MDS;
982 if (frag.mds >= 0) {
983 /* choose auth mds */
984 mds = frag.mds;
985 dout("choose_mds %p %llx.%llx "
986 "frag %u mds%d (auth)\n",
987 inode, ceph_vinop(inode), frag.frag, mds);
d66bbd44
SW		 988 if (ceph_mdsmap_get_state(mdsc->mdsmap, mds) >=
989 CEPH_MDS_STATE_ACTIVE)
30c71233 990 goto out;
2f2dc053
SW		 991 }
992 }
993 }
994
be655596 995 spin_lock(&ci->i_ceph_lock);
2f2dc053
SW		 996 cap = NULL;
997 if (mode == USE_AUTH_MDS)
998 cap = ci->i_auth_cap;
999 if (!cap && !RB_EMPTY_ROOT(&ci->i_caps))
1000 cap = rb_entry(rb_first(&ci->i_caps), struct ceph_cap, ci_node);
1001 if (!cap) {
be655596 1002 spin_unlock(&ci->i_ceph_lock);
3e1d0452 1003 ceph_async_iput(inode);
2f2dc053
SW		 1004 goto random;
1005 }
1006 mds = cap->session->s_mds;
1007 dout("choose_mds %p %llx.%llx mds%d (%scap %p)\n",
1008 inode, ceph_vinop(inode), mds,
1009 cap == ci->i_auth_cap ? "auth " : "", cap);
be655596 1010 spin_unlock(&ci->i_ceph_lock);
30c71233 1011out:
3e1d0452
YZ		 1012 /* avoid calling iput_final() while holding mdsc->mutex or
1013 * in mds dispatch threads */
1014 ceph_async_iput(inode);
2f2dc053
SW		 1015 return mds;
1016
1017random:
1018 mds = ceph_mdsmap_get_random_mds(mdsc->mdsmap);
1019 dout("choose_mds chose random mds%d\n", mds);
1020 return mds;
1021}
1022
1023
1024/*
1025 * session messages
1026 */
1027static struct ceph_msg *create_session_msg(u32 op, u64 seq)
1028{
1029 struct ceph_msg *msg;
1030 struct ceph_mds_session_head *h;
1031
b61c2763
SW		 1032 msg = ceph_msg_new(CEPH_MSG_CLIENT_SESSION, sizeof(*h), GFP_NOFS,
1033 false);
a79832f2 1034 if (!msg) {
2f2dc053 1035 pr_err("create_session_msg ENOMEM creating msg\n");
a79832f2 1036 return NULL;
2f2dc053
SW		 1037 }
1038 h = msg->front.iov_base;
1039 h->op = cpu_to_le32(op);
1040 h->seq = cpu_to_le64(seq);
dbd0c8bf
JS		 1041
1042 return msg;
1043}
1044
342ce182
YZ		 1045static void encode_supported_features(void **p, void *end)
1046{
1047 static const unsigned char bits[] = CEPHFS_FEATURES_CLIENT_SUPPORTED;
1048 static const size_t count = ARRAY_SIZE(bits);
1049
1050 if (count > 0) {
1051 size_t i;
1052 size_t size = ((size_t)bits[count - 1] + 64) / 64 * 8;
1053
1054 BUG_ON(*p + 4 + size > end);
1055 ceph_encode_32(p, size);
1056 memset(*p, 0, size);
1057 for (i = 0; i < count; i++)
1058 ((unsigned char*)(*p))[i / 8] |= 1 << (bits[i] % 8);
1059 *p += size;
1060 } else {
1061 BUG_ON(*p + 4 > end);
1062 ceph_encode_32(p, 0);
1063 }
1064}
1065
dbd0c8bf
JS		 1066/*
1067 * session message, specialization for CEPH_SESSION_REQUEST_OPEN
1068 * to include additional client metadata fields.
1069 */
1070static struct ceph_msg *create_session_open_msg(struct ceph_mds_client *mdsc, u64 seq)
1071{
1072 struct ceph_msg *msg;
1073 struct ceph_mds_session_head *h;
1074 int i = -1;
342ce182 1075 int extra_bytes = 0;
dbd0c8bf
JS		 1076 int metadata_key_count = 0;
1077 struct ceph_options *opt = mdsc->fsc->client->options;
3f384954 1078 struct ceph_mount_options *fsopt = mdsc->fsc->mount_options;
342ce182 1079 void *p, *end;
dbd0c8bf 1080
a6a5ce4f 1081 const char* metadata[][2] = {
717e6f28
YZ		 1082 {"hostname", mdsc->nodename},
1083 {"kernel_version", init_utsname()->release},
3f384954
YZ		 1084 {"entity_id", opt->name ? : ""},
1085 {"root", fsopt->server_path ? : "/"},
dbd0c8bf
JS		 1086 {NULL, NULL}
1087 };
1088
1089 /* Calculate serialized length of metadata */
342ce182 1090 extra_bytes = 4; /* map length */
d37b1d99 1091 for (i = 0; metadata[i][0]; ++i) {
342ce182 1092 extra_bytes += 8 + strlen(metadata[i][0]) +
dbd0c8bf
JS		 1093 strlen(metadata[i][1]);
1094 metadata_key_count++;
1095 }
342ce182
YZ		 1096 /* supported feature */
1097 extra_bytes += 4 + 8;
dbd0c8bf
JS		 1098
1099 /* Allocate the message */
342ce182 1100 msg = ceph_msg_new(CEPH_MSG_CLIENT_SESSION, sizeof(*h) + extra_bytes,
dbd0c8bf
JS		 1101 GFP_NOFS, false);
1102 if (!msg) {
1103 pr_err("create_session_msg ENOMEM creating msg\n");
1104 return NULL;
1105 }
342ce182
YZ		 1106 p = msg->front.iov_base;
1107 end = p + msg->front.iov_len;
1108
1109 h = p;
dbd0c8bf
JS		 1110 h->op = cpu_to_le32(CEPH_SESSION_REQUEST_OPEN);
1111 h->seq = cpu_to_le64(seq);
1112
1113 /*
1114 * Serialize client metadata into waiting buffer space, using
1115 * the format that userspace expects for map<string, string>
7cfa0313
JS		 1116 *
1117 * ClientSession messages with metadata are v2
dbd0c8bf 1118 */
342ce182 1119 msg->hdr.version = cpu_to_le16(3);
7cfa0313 1120 msg->hdr.compat_version = cpu_to_le16(1);
dbd0c8bf
JS		 1121
1122 /* The write pointer, following the session_head structure */
342ce182 1123 p += sizeof(*h);
dbd0c8bf
JS		 1124
1125 /* Number of entries in the map */
1126 ceph_encode_32(&p, metadata_key_count);
1127
1128 /* Two length-prefixed strings for each entry in the map */
d37b1d99 1129 for (i = 0; metadata[i][0]; ++i) {
dbd0c8bf
JS		 1130 size_t const key_len = strlen(metadata[i][0]);
1131 size_t const val_len = strlen(metadata[i][1]);
1132
1133 ceph_encode_32(&p, key_len);
1134 memcpy(p, metadata[i][0], key_len);
1135 p += key_len;
1136 ceph_encode_32(&p, val_len);
1137 memcpy(p, metadata[i][1], val_len);
1138 p += val_len;
1139 }
1140
342ce182
YZ		 1141 encode_supported_features(&p, end);
1142 msg->front.iov_len = p - msg->front.iov_base;
1143 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
1144
2f2dc053
SW		 1145 return msg;
1146}
1147
1148/*
1149 * send session open request.
1150 *
1151 * called under mdsc->mutex
1152 */
1153static int __open_session(struct ceph_mds_client *mdsc,
1154 struct ceph_mds_session *session)
1155{
1156 struct ceph_msg *msg;
1157 int mstate;
1158 int mds = session->s_mds;
2f2dc053
SW		 1159
1160 /* wait for mds to go active? */
1161 mstate = ceph_mdsmap_get_state(mdsc->mdsmap, mds);
1162 dout("open_session to mds%d (%s)\n", mds,
1163 ceph_mds_state_name(mstate));
1164 session->s_state = CEPH_MDS_SESSION_OPENING;
1165 session->s_renew_requested = jiffies;
1166
1167 /* send connect message */
dbd0c8bf 1168 msg = create_session_open_msg(mdsc, session->s_seq);
a79832f2
SW		 1169 if (!msg)
1170 return -ENOMEM;
2f2dc053 1171 ceph_con_send(&session->s_con, msg);
2f2dc053
SW		 1172 return 0;
1173}
1174
ed0552a1
SW		 1175/*
1176 * open sessions for any export targets for the given mds
1177 *
1178 * called under mdsc->mutex
1179 */
5d72d13c
YZ		 1180static struct ceph_mds_session *
1181__open_export_target_session(struct ceph_mds_client *mdsc, int target)
1182{
1183 struct ceph_mds_session *session;
1184
1185 session = __ceph_lookup_mds_session(mdsc, target);
1186 if (!session) {
1187 session = register_session(mdsc, target);
1188 if (IS_ERR(session))
1189 return session;
1190 }
1191 if (session->s_state == CEPH_MDS_SESSION_NEW ||
1192 session->s_state == CEPH_MDS_SESSION_CLOSING)
1193 __open_session(mdsc, session);
1194
1195 return session;
1196}
1197
1198struct ceph_mds_session *
1199ceph_mdsc_open_export_target_session(struct ceph_mds_client *mdsc, int target)
1200{
1201 struct ceph_mds_session *session;
1202
1203 dout("open_export_target_session to mds%d\n", target);
1204
1205 mutex_lock(&mdsc->mutex);
1206 session = __open_export_target_session(mdsc, target);
1207 mutex_unlock(&mdsc->mutex);
1208
1209 return session;
1210}
1211
ed0552a1
SW		 1212static void __open_export_target_sessions(struct ceph_mds_client *mdsc,
1213 struct ceph_mds_session *session)
1214{
1215 struct ceph_mds_info *mi;
1216 struct ceph_mds_session *ts;
1217 int i, mds = session->s_mds;
ed0552a1 1218
76201b63 1219 if (mds >= mdsc->mdsmap->m_num_mds)
ed0552a1 1220 return;
5d72d13c 1221
ed0552a1
SW		 1222 mi = &mdsc->mdsmap->m_info[mds];
1223 dout("open_export_target_sessions for mds%d (%d targets)\n",
1224 session->s_mds, mi->num_export_targets);
1225
1226 for (i = 0; i < mi->num_export_targets; i++) {
5d72d13c
YZ		 1227 ts = __open_export_target_session(mdsc, mi->export_targets[i]);
1228 if (!IS_ERR(ts))
1229 ceph_put_mds_session(ts);
ed0552a1
SW		 1230 }
1231}
1232
154f42c2
SW		 1233void ceph_mdsc_open_export_target_sessions(struct ceph_mds_client *mdsc,
1234 struct ceph_mds_session *session)
1235{
1236 mutex_lock(&mdsc->mutex);
1237 __open_export_target_sessions(mdsc, session);
1238 mutex_unlock(&mdsc->mutex);
1239}
1240
2f2dc053
SW		 1241/*
1242 * session caps
1243 */
1244
c8a96a31
JL		 1245static void detach_cap_releases(struct ceph_mds_session *session,
1246 struct list_head *target)
2f2dc053 1247{
c8a96a31
JL		 1248 lockdep_assert_held(&session->s_cap_lock);
1249
1250 list_splice_init(&session->s_cap_releases, target);
745a8e3b 1251 session->s_num_cap_releases = 0;
c8a96a31
JL		 1252 dout("dispose_cap_releases mds%d\n", session->s_mds);
1253}
2f2dc053 1254
c8a96a31
JL		 1255static void dispose_cap_releases(struct ceph_mds_client *mdsc,
1256 struct list_head *dispose)
1257{
1258 while (!list_empty(dispose)) {
745a8e3b
YZ		 1259 struct ceph_cap *cap;
1260 /* zero out the in-progress message */
c8a96a31 1261 cap = list_first_entry(dispose, struct ceph_cap, session_caps);
745a8e3b
YZ		 1262 list_del(&cap->session_caps);
1263 ceph_put_cap(mdsc, cap);
2f2dc053 1264 }
2f2dc053
SW		 1265}
1266
1c841a96
YZ		 1267static void cleanup_session_requests(struct ceph_mds_client *mdsc,
1268 struct ceph_mds_session *session)
1269{
1270 struct ceph_mds_request *req;
1271 struct rb_node *p;
f4b97866 1272 struct ceph_inode_info *ci;
1c841a96
YZ		 1273
1274 dout("cleanup_session_requests mds%d\n", session->s_mds);
1275 mutex_lock(&mdsc->mutex);
1276 while (!list_empty(&session->s_unsafe)) {
1277 req = list_first_entry(&session->s_unsafe,
1278 struct ceph_mds_request, r_unsafe_item);
3e0708b9
YZ		 1279 pr_warn_ratelimited(" dropping unsafe request %llu\n",
1280 req->r_tid);
f4b97866
YZ		 1281 if (req->r_target_inode) {
1282 /* dropping unsafe change of inode's attributes */
1283 ci = ceph_inode(req->r_target_inode);
1284 errseq_set(&ci->i_meta_err, -EIO);
1285 }
1286 if (req->r_unsafe_dir) {
1287 /* dropping unsafe directory operation */
1288 ci = ceph_inode(req->r_unsafe_dir);
1289 errseq_set(&ci->i_meta_err, -EIO);
1290 }
1c841a96
YZ		 1291 __unregister_request(mdsc, req);
1292 }
1293 /* zero r_attempts, so kick_requests() will re-send requests */
1294 p = rb_first(&mdsc->request_tree);
1295 while (p) {
1296 req = rb_entry(p, struct ceph_mds_request, r_node);
1297 p = rb_next(p);
1298 if (req->r_session &&
1299 req->r_session->s_mds == session->s_mds)
1300 req->r_attempts = 0;
1301 }
1302 mutex_unlock(&mdsc->mutex);
1303}
1304
2f2dc053 1305/*
f818a736
SW		 1306 * Helper to safely iterate over all caps associated with a session, with
1307 * special care taken to handle a racing __ceph_remove_cap().
2f2dc053 1308 *
f818a736 1309 * Caller must hold session s_mutex.
2f2dc053 1310 */
f5d77269
JL		 1311int ceph_iterate_session_caps(struct ceph_mds_session *session,
1312 int (*cb)(struct inode *, struct ceph_cap *,
1313 void *), void *arg)
2f2dc053 1314{
7c1332b8
SW		 1315 struct list_head *p;
1316 struct ceph_cap *cap;
1317 struct inode *inode, *last_inode = NULL;
1318 struct ceph_cap *old_cap = NULL;
2f2dc053
SW		 1319 int ret;
1320
1321 dout("iterate_session_caps %p mds%d\n", session, session->s_mds);
1322 spin_lock(&session->s_cap_lock);
7c1332b8
SW		 1323 p = session->s_caps.next;
1324 while (p != &session->s_caps) {
1325 cap = list_entry(p, struct ceph_cap, session_caps);
2f2dc053 1326 inode = igrab(&cap->ci->vfs_inode);
7c1332b8
SW		 1327 if (!inode) {
1328 p = p->next;
2f2dc053 1329 continue;
7c1332b8
SW		 1330 }
1331 session->s_cap_iterator = cap;
2f2dc053 1332 spin_unlock(&session->s_cap_lock);
7c1332b8
SW		 1333
1334 if (last_inode) {
3e1d0452
YZ		 1335 /* avoid calling iput_final() while holding
1336 * s_mutex or in mds dispatch threads */
1337 ceph_async_iput(last_inode);
7c1332b8
SW		 1338 last_inode = NULL;
1339 }
1340 if (old_cap) {
37151668 1341 ceph_put_cap(session->s_mdsc, old_cap);
7c1332b8
SW		 1342 old_cap = NULL;
1343 }
1344
2f2dc053 1345 ret = cb(inode, cap, arg);
7c1332b8
SW		 1346 last_inode = inode;
1347
2f2dc053 1348 spin_lock(&session->s_cap_lock);
7c1332b8 1349 p = p->next;
d37b1d99 1350 if (!cap->ci) {
7c1332b8
SW		 1351 dout("iterate_session_caps finishing cap %p removal\n",
1352 cap);
1353 BUG_ON(cap->session != session);
745a8e3b 1354 cap->session = NULL;
7c1332b8
SW		 1355 list_del_init(&cap->session_caps);
1356 session->s_nr_caps--;
e3ec8d68
YZ		 1357 if (cap->queue_release)
1358 __ceph_queue_cap_release(session, cap);
1359 else
745a8e3b 1360 old_cap = cap; /* put_cap it w/o locks held */
7c1332b8 1361 }
5dacf091
SW		 1362 if (ret < 0)
1363 goto out;
2f2dc053 1364 }
5dacf091
SW		 1365 ret = 0;
1366out:
7c1332b8 1367 session->s_cap_iterator = NULL;
2f2dc053 1368 spin_unlock(&session->s_cap_lock);
7c1332b8 1369
3e1d0452 1370 ceph_async_iput(last_inode);
7c1332b8 1371 if (old_cap)
37151668 1372 ceph_put_cap(session->s_mdsc, old_cap);
7c1332b8 1373
5dacf091 1374 return ret;
2f2dc053
SW		 1375}
1376
1377static int remove_session_caps_cb(struct inode *inode, struct ceph_cap *cap,
6c99f254 1378 void *arg)
2f2dc053 1379{
6c93df5d 1380 struct ceph_fs_client *fsc = (struct ceph_fs_client *)arg;
2f2dc053 1381 struct ceph_inode_info *ci = ceph_inode(inode);
553adfd9 1382 LIST_HEAD(to_remove);
f4b97866 1383 bool dirty_dropped = false;
6c93df5d 1384 bool invalidate = false;
6c99f254 1385
2f2dc053
SW		 1386 dout("removing cap %p, ci is %p, inode is %p\n",
1387 cap, ci, &ci->vfs_inode);
be655596 1388 spin_lock(&ci->i_ceph_lock);
d2f8bb27
YZ		 1389 if (cap->mds_wanted | cap->issued)
1390 ci->i_ceph_flags |= CEPH_I_CAP_DROPPED;
a096b09a 1391 __ceph_remove_cap(cap, false);
571ade33 1392 if (!ci->i_auth_cap) {
553adfd9 1393 struct ceph_cap_flush *cf;
6c93df5d 1394 struct ceph_mds_client *mdsc = fsc->mdsc;
6c99f254 1395
d468e729
YZ		 1396 if (READ_ONCE(fsc->mount_state) == CEPH_MOUNT_SHUTDOWN) {
1397 if (inode->i_data.nrpages > 0)
1398 invalidate = true;
1399 if (ci->i_wrbuffer_ref > 0)
1400 mapping_set_error(&inode->i_data, -EIO);
1401 }
6c93df5d 1402
e4500b5e
YZ		 1403 while (!list_empty(&ci->i_cap_flush_list)) {
1404 cf = list_first_entry(&ci->i_cap_flush_list,
1405 struct ceph_cap_flush, i_list);
8cdcc07d 1406 list_move(&cf->i_list, &to_remove);
553adfd9
YZ		 1407 }
1408
6c99f254 1409 spin_lock(&mdsc->cap_dirty_lock);
8310b089 1410
e4500b5e
YZ		 1411 list_for_each_entry(cf, &to_remove, i_list)
1412 list_del(&cf->g_list);
8310b089 1413
6c99f254 1414 if (!list_empty(&ci->i_dirty_item)) {
3e0708b9
YZ		 1415 pr_warn_ratelimited(
1416 " dropping dirty %s state for %p %lld\n",
6c99f254
SW		 1417 ceph_cap_string(ci->i_dirty_caps),
1418 inode, ceph_ino(inode));
1419 ci->i_dirty_caps = 0;
1420 list_del_init(&ci->i_dirty_item);
f4b97866 1421 dirty_dropped = true;
6c99f254
SW		 1422 }
1423 if (!list_empty(&ci->i_flushing_item)) {
3e0708b9
YZ		 1424 pr_warn_ratelimited(
1425 " dropping dirty+flushing %s state for %p %lld\n",
6c99f254
SW		 1426 ceph_cap_string(ci->i_flushing_caps),
1427 inode, ceph_ino(inode));
1428 ci->i_flushing_caps = 0;
1429 list_del_init(&ci->i_flushing_item);
1430 mdsc->num_cap_flushing--;
f4b97866 1431 dirty_dropped = true;
6c99f254 1432 }
6c99f254 1433 spin_unlock(&mdsc->cap_dirty_lock);
553adfd9 1434
f4b97866
YZ		 1435 if (dirty_dropped) {
1436 errseq_set(&ci->i_meta_err, -EIO);
1437
1438 if (ci->i_wrbuffer_ref_head == 0 &&
1439 ci->i_wr_ref == 0 &&
1440 ci->i_dirty_caps == 0 &&
1441 ci->i_flushing_caps == 0) {
1442 ceph_put_snap_context(ci->i_head_snapc);
1443 ci->i_head_snapc = NULL;
1444 }
1445 }
1446
b3f8d68f
YZ		 1447 if (atomic_read(&ci->i_filelock_ref) > 0) {
1448 /* make further file lock syscall return -EIO */
1449 ci->i_ceph_flags |= CEPH_I_ERROR_FILELOCK;
1450 pr_warn_ratelimited(" dropping file locks for %p %lld\n",
1451 inode, ceph_ino(inode));
1452 }
1453
f66fd9f0 1454 if (!ci->i_dirty_caps && ci->i_prealloc_cap_flush) {
e4500b5e 1455 list_add(&ci->i_prealloc_cap_flush->i_list, &to_remove);
f66fd9f0
YZ		 1456 ci->i_prealloc_cap_flush = NULL;
1457 }
6c99f254 1458 }
be655596 1459 spin_unlock(&ci->i_ceph_lock);
553adfd9
YZ		 1460 while (!list_empty(&to_remove)) {
1461 struct ceph_cap_flush *cf;
1462 cf = list_first_entry(&to_remove,
e4500b5e
YZ		 1463 struct ceph_cap_flush, i_list);
1464 list_del(&cf->i_list);
f66fd9f0 1465 ceph_free_cap_flush(cf);
553adfd9 1466 }
77310320
YZ		 1467
1468 wake_up_all(&ci->i_cap_wq);
6c93df5d
YZ		 1469 if (invalidate)
1470 ceph_queue_invalidate(inode);
f4b97866 1471 if (dirty_dropped)
6c99f254 1472 iput(inode);
2f2dc053
SW		 1473 return 0;
1474}
1475
1476/*
1477 * caller must hold session s_mutex
1478 */
1479static void remove_session_caps(struct ceph_mds_session *session)
1480{
6c93df5d
YZ		 1481 struct ceph_fs_client *fsc = session->s_mdsc->fsc;
1482 struct super_block *sb = fsc->sb;
c8a96a31
JL		 1483 LIST_HEAD(dispose);
1484
2f2dc053 1485 dout("remove_session_caps on %p\n", session);
f5d77269 1486 ceph_iterate_session_caps(session, remove_session_caps_cb, fsc);
6f60f889 1487
c8799fc4
YZ		 1488 wake_up_all(&fsc->mdsc->cap_flushing_wq);
1489
6f60f889
YZ		 1490 spin_lock(&session->s_cap_lock);
1491 if (session->s_nr_caps > 0) {
6f60f889
YZ		 1492 struct inode *inode;
1493 struct ceph_cap *cap, *prev = NULL;
1494 struct ceph_vino vino;
1495 /*
1496 * iterate_session_caps() skips inodes that are being
1497 * deleted, we need to wait until deletions are complete.
1498 * __wait_on_freeing_inode() is designed for the job,
1499 * but it is not exported, so use lookup inode function
1500 * to access it.
1501 */
1502 while (!list_empty(&session->s_caps)) {
1503 cap = list_entry(session->s_caps.next,
1504 struct ceph_cap, session_caps);
1505 if (cap == prev)
1506 break;
1507 prev = cap;
1508 vino = cap->ci->i_vino;
1509 spin_unlock(&session->s_cap_lock);
1510
ed284c49 1511 inode = ceph_find_inode(sb, vino);
3e1d0452
YZ		 1512 /* avoid calling iput_final() while holding s_mutex */
1513 ceph_async_iput(inode);
6f60f889
YZ		 1514
1515 spin_lock(&session->s_cap_lock);
1516 }
1517 }
745a8e3b
YZ		 1518
1519 // drop cap expires and unlock s_cap_lock
c8a96a31 1520 detach_cap_releases(session, &dispose);
6f60f889 1521
2f2dc053 1522 BUG_ON(session->s_nr_caps > 0);
6c99f254 1523 BUG_ON(!list_empty(&session->s_cap_flushing));
c8a96a31
JL		 1524 spin_unlock(&session->s_cap_lock);
1525 dispose_cap_releases(session->s_mdsc, &dispose);
2f2dc053
SW		 1526}
1527
d2f8bb27
YZ		 1528enum {
1529 RECONNECT,
1530 RENEWCAPS,
1531 FORCE_RO,
1532};
1533
2f2dc053
SW		 1534/*
1535 * wake up any threads waiting on this session's caps. if the cap is
1536 * old (didn't get renewed on the client reconnect), remove it now.
1537 *
1538 * caller must hold s_mutex.
1539 */
1540static int wake_up_session_cb(struct inode *inode, struct ceph_cap *cap,
1541 void *arg)
1542{
0dc2570f 1543 struct ceph_inode_info *ci = ceph_inode(inode);
d2f8bb27 1544 unsigned long ev = (unsigned long)arg;
0dc2570f 1545
d2f8bb27 1546 if (ev == RECONNECT) {
be655596 1547 spin_lock(&ci->i_ceph_lock);
0dc2570f
SW		 1548 ci->i_wanted_max_size = 0;
1549 ci->i_requested_max_size = 0;
be655596 1550 spin_unlock(&ci->i_ceph_lock);
d2f8bb27
YZ		 1551 } else if (ev == RENEWCAPS) {
1552 if (cap->cap_gen < cap->session->s_cap_gen) {
1553 /* mds did not re-issue stale cap */
1554 spin_lock(&ci->i_ceph_lock);
1555 cap->issued = cap->implemented = CEPH_CAP_PIN;
1556 /* make sure mds knows what we want */
1557 if (__ceph_caps_file_wanted(ci) & ~cap->mds_wanted)
1558 ci->i_ceph_flags |= CEPH_I_CAP_DROPPED;
1559 spin_unlock(&ci->i_ceph_lock);
1560 }
1561 } else if (ev == FORCE_RO) {
0dc2570f 1562 }
e5360309 1563 wake_up_all(&ci->i_cap_wq);
2f2dc053
SW		 1564 return 0;
1565}
1566
d2f8bb27 1567static void wake_up_session_caps(struct ceph_mds_session *session, int ev)
2f2dc053
SW		 1568{
1569 dout("wake_up_session_caps %p mds%d\n", session, session->s_mds);
f5d77269
JL		 1570 ceph_iterate_session_caps(session, wake_up_session_cb,
1571 (void *)(unsigned long)ev);
2f2dc053
SW		 1572}
1573
1574/*
1575 * Send periodic message to MDS renewing all currently held caps. The
1576 * ack will reset the expiration for all caps from this session.
1577 *
1578 * caller holds s_mutex
1579 */
1580static int send_renew_caps(struct ceph_mds_client *mdsc,
1581 struct ceph_mds_session *session)
1582{
1583 struct ceph_msg *msg;
1584 int state;
1585
1586 if (time_after_eq(jiffies, session->s_cap_ttl) &&
1587 time_after_eq(session->s_cap_ttl, session->s_renew_requested))
1588 pr_info("mds%d caps stale\n", session->s_mds);
e4cb4cb8 1589 session->s_renew_requested = jiffies;
2f2dc053
SW		 1590
1591 /* do not try to renew caps until a recovering mds has reconnected
1592 * with its clients. */
1593 state = ceph_mdsmap_get_state(mdsc->mdsmap, session->s_mds);
1594 if (state < CEPH_MDS_STATE_RECONNECT) {
1595 dout("send_renew_caps ignoring mds%d (%s)\n",
1596 session->s_mds, ceph_mds_state_name(state));
1597 return 0;
1598 }
1599
1600 dout("send_renew_caps to mds%d (%s)\n", session->s_mds,
1601 ceph_mds_state_name(state));
2f2dc053
SW		 1602 msg = create_session_msg(CEPH_SESSION_REQUEST_RENEWCAPS,
1603 ++session->s_renew_seq);
a79832f2
SW		 1604 if (!msg)
1605 return -ENOMEM;
2f2dc053
SW		 1606 ceph_con_send(&session->s_con, msg);
1607 return 0;
1608}
1609
186e4f7a
YZ		 1610static int send_flushmsg_ack(struct ceph_mds_client *mdsc,
1611 struct ceph_mds_session *session, u64 seq)
1612{
1613 struct ceph_msg *msg;
1614
1615 dout("send_flushmsg_ack to mds%d (%s)s seq %lld\n",
a687ecaf 1616 session->s_mds, ceph_session_state_name(session->s_state), seq);
186e4f7a
YZ		 1617 msg = create_session_msg(CEPH_SESSION_FLUSHMSG_ACK, seq);
1618 if (!msg)
1619 return -ENOMEM;
1620 ceph_con_send(&session->s_con, msg);
1621 return 0;
1622}
1623
1624
2f2dc053
SW		 1625/*
1626 * Note new cap ttl, and any transition from stale -> not stale (fresh?).
0dc2570f
SW		 1627 *
1628 * Called under session->s_mutex
2f2dc053
SW		 1629 */
1630static void renewed_caps(struct ceph_mds_client *mdsc,
1631 struct ceph_mds_session *session, int is_renew)
1632{
1633 int was_stale;
1634 int wake = 0;
1635
1636 spin_lock(&session->s_cap_lock);
1ce208a6 1637 was_stale = is_renew && time_after_eq(jiffies, session->s_cap_ttl);
2f2dc053
SW		 1638
1639 session->s_cap_ttl = session->s_renew_requested +
1640 mdsc->mdsmap->m_session_timeout*HZ;
1641
1642 if (was_stale) {
1643 if (time_before(jiffies, session->s_cap_ttl)) {
1644 pr_info("mds%d caps renewed\n", session->s_mds);
1645 wake = 1;
1646 } else {
1647 pr_info("mds%d caps still stale\n", session->s_mds);
1648 }
1649 }
1650 dout("renewed_caps mds%d ttl now %lu, was %s, now %s\n",
1651 session->s_mds, session->s_cap_ttl, was_stale ? "stale" : "fresh",
1652 time_before(jiffies, session->s_cap_ttl) ? "stale" : "fresh");
1653 spin_unlock(&session->s_cap_lock);
1654
1655 if (wake)
d2f8bb27 1656 wake_up_session_caps(session, RENEWCAPS);
2f2dc053
SW		 1657}
1658
1659/*
1660 * send a session close request
1661 */
1662static int request_close_session(struct ceph_mds_client *mdsc,
1663 struct ceph_mds_session *session)
1664{
1665 struct ceph_msg *msg;
2f2dc053
SW		 1666
1667 dout("request_close_session mds%d state %s seq %lld\n",
a687ecaf 1668 session->s_mds, ceph_session_state_name(session->s_state),
2f2dc053
SW		 1669 session->s_seq);
1670 msg = create_session_msg(CEPH_SESSION_REQUEST_CLOSE, session->s_seq);
a79832f2
SW		 1671 if (!msg)
1672 return -ENOMEM;
1673 ceph_con_send(&session->s_con, msg);
fcff415c 1674 return 1;
2f2dc053
SW		 1675}
1676
1677/*
1678 * Called with s_mutex held.
1679 */
1680static int __close_session(struct ceph_mds_client *mdsc,
1681 struct ceph_mds_session *session)
1682{
1683 if (session->s_state >= CEPH_MDS_SESSION_CLOSING)
1684 return 0;
1685 session->s_state = CEPH_MDS_SESSION_CLOSING;
1686 return request_close_session(mdsc, session);
1687}
1688
040d7860
YZ		 1689static bool drop_negative_children(struct dentry *dentry)
1690{
1691 struct dentry *child;
1692 bool all_negative = true;
1693
1694 if (!d_is_dir(dentry))
1695 goto out;
1696
1697 spin_lock(&dentry->d_lock);
1698 list_for_each_entry(child, &dentry->d_subdirs, d_child) {
1699 if (d_really_is_positive(child)) {
1700 all_negative = false;
1701 break;
1702 }
1703 }
1704 spin_unlock(&dentry->d_lock);
1705
1706 if (all_negative)
1707 shrink_dcache_parent(dentry);
1708out:
1709 return all_negative;
1710}
1711
2f2dc053
SW		 1712/*
1713 * Trim old(er) caps.
1714 *
1715 * Because we can't cache an inode without one or more caps, we do
1716 * this indirectly: if a cap is unused, we prune its aliases, at which
1717 * point the inode will hopefully get dropped to.
1718 *
1719 * Yes, this is a bit sloppy. Our only real goal here is to respond to
1720 * memory pressure from the MDS, though, so it needn't be perfect.
1721 */
1722static int trim_caps_cb(struct inode *inode, struct ceph_cap *cap, void *arg)
1723{
533a2818 1724 int *remaining = arg;
2f2dc053 1725 struct ceph_inode_info *ci = ceph_inode(inode);
979abfdd 1726 int used, wanted, oissued, mine;
2f2dc053 1727
533a2818 1728 if (*remaining <= 0)
2f2dc053
SW		 1729 return -1;
1730
be655596 1731 spin_lock(&ci->i_ceph_lock);
2f2dc053
SW		 1732 mine = cap->issued | cap->implemented;
1733 used = __ceph_caps_used(ci);
979abfdd 1734 wanted = __ceph_caps_file_wanted(ci);
2f2dc053
SW		 1735 oissued = __ceph_caps_issued_other(ci, cap);
1736
979abfdd 1737 dout("trim_caps_cb %p cap %p mine %s oissued %s used %s wanted %s\n",
2f2dc053 1738 inode, cap, ceph_cap_string(mine), ceph_cap_string(oissued),
979abfdd
YZ		 1739 ceph_cap_string(used), ceph_cap_string(wanted));
1740 if (cap == ci->i_auth_cap) {
622f3e25
YZ		 1741 if (ci->i_dirty_caps || ci->i_flushing_caps ||
1742 !list_empty(&ci->i_cap_snaps))
979abfdd
YZ		 1743 goto out;
1744 if ((used | wanted) & CEPH_CAP_ANY_WR)
1745 goto out;
89aa5930
YZ		 1746 /* Note: it's possible that i_filelock_ref becomes non-zero
1747 * after dropping auth caps. It doesn't hurt because reply
1748 * of lock mds request will re-add auth caps. */
1749 if (atomic_read(&ci->i_filelock_ref) > 0)
1750 goto out;
979abfdd 1751 }
5e804ac4
YZ		 1752 /* The inode has cached pages, but it's no longer used.
1753 * we can safely drop it */
1754 if (wanted == 0 && used == CEPH_CAP_FILE_CACHE &&
1755 !(oissued & CEPH_CAP_FILE_CACHE)) {
1756 used = 0;
1757 oissued = 0;
1758 }
979abfdd 1759 if ((used | wanted) & ~oissued & mine)
2f2dc053
SW		 1760 goto out; /* we need these caps */
1761
2f2dc053
SW		 1762 if (oissued) {
1763 /* we aren't the only cap.. just remove us */
a096b09a 1764 __ceph_remove_cap(cap, true);
533a2818 1765 (*remaining)--;
2f2dc053 1766 } else {
040d7860 1767 struct dentry *dentry;
5e804ac4 1768 /* try dropping referring dentries */
be655596 1769 spin_unlock(&ci->i_ceph_lock);
040d7860
YZ		 1770 dentry = d_find_any_alias(inode);
1771 if (dentry && drop_negative_children(dentry)) {
1772 int count;
1773 dput(dentry);
1774 d_prune_aliases(inode);
1775 count = atomic_read(&inode->i_count);
1776 if (count == 1)
533a2818 1777 (*remaining)--;
040d7860
YZ		 1778 dout("trim_caps_cb %p cap %p pruned, count now %d\n",
1779 inode, cap, count);
1780 } else {
1781 dput(dentry);
1782 }
2f2dc053
SW		 1783 return 0;
1784 }
1785
1786out:
be655596 1787 spin_unlock(&ci->i_ceph_lock);
2f2dc053
SW		 1788 return 0;
1789}
1790
1791/*
1792 * Trim session cap count down to some max number.
1793 */
e30ee581
ZZ		 1794int ceph_trim_caps(struct ceph_mds_client *mdsc,
1795 struct ceph_mds_session *session,
1796 int max_caps)
2f2dc053
SW		 1797{
1798 int trim_caps = session->s_nr_caps - max_caps;
1799
1800 dout("trim_caps mds%d start: %d / %d, trim %d\n",
1801 session->s_mds, session->s_nr_caps, max_caps, trim_caps);
1802 if (trim_caps > 0) {
533a2818
JL		 1803 int remaining = trim_caps;
1804
1805 ceph_iterate_session_caps(session, trim_caps_cb, &remaining);
2f2dc053
SW		 1806 dout("trim_caps mds%d done: %d / %d, trimmed %d\n",
1807 session->s_mds, session->s_nr_caps, max_caps,
533a2818 1808 trim_caps - remaining);
2f2dc053 1809 }
a56371d9 1810
e3ec8d68 1811 ceph_flush_cap_releases(mdsc, session);
2f2dc053
SW		 1812 return 0;
1813}
1814
8310b089
YZ		 1815static int check_caps_flush(struct ceph_mds_client *mdsc,
1816 u64 want_flush_tid)
1817{
8310b089
YZ		 1818 int ret = 1;
1819
1820 spin_lock(&mdsc->cap_dirty_lock);
e4500b5e
YZ		 1821 if (!list_empty(&mdsc->cap_flush_list)) {
1822 struct ceph_cap_flush *cf =
1823 list_first_entry(&mdsc->cap_flush_list,
1824 struct ceph_cap_flush, g_list);
1825 if (cf->tid <= want_flush_tid) {
1826 dout("check_caps_flush still flushing tid "
1827 "%llu <= %llu\n", cf->tid, want_flush_tid);
1828 ret = 0;
1829 }
8310b089
YZ		 1830 }
1831 spin_unlock(&mdsc->cap_dirty_lock);
1832 return ret;
d3383a8e
YZ		 1833}
1834
2f2dc053
SW		 1835/*
1836 * flush all dirty inode data to disk.
1837 *
8310b089 1838 * returns true if we've flushed through want_flush_tid
2f2dc053 1839 */
affbc19a 1840static void wait_caps_flush(struct ceph_mds_client *mdsc,
0e294387 1841 u64 want_flush_tid)
2f2dc053 1842{
0e294387 1843 dout("check_caps_flush want %llu\n", want_flush_tid);
8310b089
YZ		 1844
1845 wait_event(mdsc->cap_flushing_wq,
1846 check_caps_flush(mdsc, want_flush_tid));
1847
1848 dout("check_caps_flush ok, flushed thru %llu\n", want_flush_tid);
2f2dc053
SW		 1849}
1850
1851/*
1852 * called under s_mutex
1853 */
e3ec8d68
YZ		 1854static void ceph_send_cap_releases(struct ceph_mds_client *mdsc,
1855 struct ceph_mds_session *session)
2f2dc053 1856{
745a8e3b
YZ		 1857 struct ceph_msg *msg = NULL;
1858 struct ceph_mds_cap_release *head;
1859 struct ceph_mds_cap_item *item;
92475f05 1860 struct ceph_osd_client *osdc = &mdsc->fsc->client->osdc;
745a8e3b
YZ		 1861 struct ceph_cap *cap;
1862 LIST_HEAD(tmp_list);
1863 int num_cap_releases;
92475f05
JL		 1864 __le32 barrier, *cap_barrier;
1865
1866 down_read(&osdc->lock);
1867 barrier = cpu_to_le32(osdc->epoch_barrier);
1868 up_read(&osdc->lock);
2f2dc053 1869
0f8605f2 1870 spin_lock(&session->s_cap_lock);
745a8e3b
YZ		 1871again:
1872 list_splice_init(&session->s_cap_releases, &tmp_list);
1873 num_cap_releases = session->s_num_cap_releases;
1874 session->s_num_cap_releases = 0;
2f2dc053 1875 spin_unlock(&session->s_cap_lock);
e01a5946 1876
745a8e3b
YZ		 1877 while (!list_empty(&tmp_list)) {
1878 if (!msg) {
1879 msg = ceph_msg_new(CEPH_MSG_CLIENT_CAPRELEASE,
09cbfeaf 1880 PAGE_SIZE, GFP_NOFS, false);
745a8e3b
YZ		 1881 if (!msg)
1882 goto out_err;
1883 head = msg->front.iov_base;
1884 head->num = cpu_to_le32(0);
1885 msg->front.iov_len = sizeof(*head);
92475f05
JL		 1886
1887 msg->hdr.version = cpu_to_le16(2);
1888 msg->hdr.compat_version = cpu_to_le16(1);
745a8e3b 1889 }
92475f05 1890
745a8e3b
YZ		 1891 cap = list_first_entry(&tmp_list, struct ceph_cap,
1892 session_caps);
1893 list_del(&cap->session_caps);
1894 num_cap_releases--;
e01a5946 1895
00bd8edb 1896 head = msg->front.iov_base;
4198aba4
JL		 1897 put_unaligned_le32(get_unaligned_le32(&head->num) + 1,
1898 &head->num);
745a8e3b
YZ		 1899 item = msg->front.iov_base + msg->front.iov_len;
1900 item->ino = cpu_to_le64(cap->cap_ino);
1901 item->cap_id = cpu_to_le64(cap->cap_id);
1902 item->migrate_seq = cpu_to_le32(cap->mseq);
1903 item->seq = cpu_to_le32(cap->issue_seq);
1904 msg->front.iov_len += sizeof(*item);
1905
1906 ceph_put_cap(mdsc, cap);
1907
1908 if (le32_to_cpu(head->num) == CEPH_CAPS_PER_RELEASE) {
92475f05
JL		 1909 // Append cap_barrier field
1910 cap_barrier = msg->front.iov_base + msg->front.iov_len;
1911 *cap_barrier = barrier;
1912 msg->front.iov_len += sizeof(*cap_barrier);
1913
745a8e3b
YZ		 1914 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
1915 dout("send_cap_releases mds%d %p\n", session->s_mds, msg);
1916 ceph_con_send(&session->s_con, msg);
1917 msg = NULL;
1918 }
00bd8edb 1919 }
e01a5946 1920
745a8e3b 1921 BUG_ON(num_cap_releases != 0);
e01a5946 1922
745a8e3b
YZ		 1923 spin_lock(&session->s_cap_lock);
1924 if (!list_empty(&session->s_cap_releases))
1925 goto again;
1926 spin_unlock(&session->s_cap_lock);
1927
1928 if (msg) {
92475f05
JL		 1929 // Append cap_barrier field
1930 cap_barrier = msg->front.iov_base + msg->front.iov_len;
1931 *cap_barrier = barrier;
1932 msg->front.iov_len += sizeof(*cap_barrier);
1933
745a8e3b
YZ		 1934 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
1935 dout("send_cap_releases mds%d %p\n", session->s_mds, msg);
1936 ceph_con_send(&session->s_con, msg);
e01a5946 1937 }
745a8e3b
YZ		 1938 return;
1939out_err:
1940 pr_err("send_cap_releases mds%d, failed to allocate message\n",
1941 session->s_mds);
1942 spin_lock(&session->s_cap_lock);
1943 list_splice(&tmp_list, &session->s_cap_releases);
1944 session->s_num_cap_releases += num_cap_releases;
1945 spin_unlock(&session->s_cap_lock);
e01a5946
SW		 1946}
1947
e3ec8d68
YZ		 1948static void ceph_cap_release_work(struct work_struct *work)
1949{
1950 struct ceph_mds_session *session =
1951 container_of(work, struct ceph_mds_session, s_cap_release_work);
1952
1953 mutex_lock(&session->s_mutex);
1954 if (session->s_state == CEPH_MDS_SESSION_OPEN ||
1955 session->s_state == CEPH_MDS_SESSION_HUNG)
1956 ceph_send_cap_releases(session->s_mdsc, session);
1957 mutex_unlock(&session->s_mutex);
1958 ceph_put_mds_session(session);
1959}
1960
1961void ceph_flush_cap_releases(struct ceph_mds_client *mdsc,
1962 struct ceph_mds_session *session)
1963{
1964 if (mdsc->stopping)
1965 return;
1966
1967 get_session(session);
1968 if (queue_work(mdsc->fsc->cap_wq,
1969 &session->s_cap_release_work)) {
1970 dout("cap release work queued\n");
1971 } else {
1972 ceph_put_mds_session(session);
1973 dout("failed to queue cap release work\n");
1974 }
1975}
1976
1977/*
1978 * caller holds session->s_cap_lock
1979 */
1980void __ceph_queue_cap_release(struct ceph_mds_session *session,
1981 struct ceph_cap *cap)
1982{
1983 list_add_tail(&cap->session_caps, &session->s_cap_releases);
1984 session->s_num_cap_releases++;
1985
1986 if (!(session->s_num_cap_releases % CEPH_CAPS_PER_RELEASE))
1987 ceph_flush_cap_releases(session->s_mdsc, session);
1988}
1989
37c4efc1
YZ		 1990static void ceph_cap_reclaim_work(struct work_struct *work)
1991{
1992 struct ceph_mds_client *mdsc =
1993 container_of(work, struct ceph_mds_client, cap_reclaim_work);
1994 int ret = ceph_trim_dentries(mdsc);
1995 if (ret == -EAGAIN)
1996 ceph_queue_cap_reclaim_work(mdsc);
1997}
1998
1999void ceph_queue_cap_reclaim_work(struct ceph_mds_client *mdsc)
2000{
2001 if (mdsc->stopping)
2002 return;
2003
2004 if (queue_work(mdsc->fsc->cap_wq, &mdsc->cap_reclaim_work)) {
2005 dout("caps reclaim work queued\n");
2006 } else {
2007 dout("failed to queue caps release work\n");
2008 }
2009}
2010
fe33032d
YZ		 2011void ceph_reclaim_caps_nr(struct ceph_mds_client *mdsc, int nr)
2012{
2013 int val;
2014 if (!nr)
2015 return;
2016 val = atomic_add_return(nr, &mdsc->cap_reclaim_pending);
2017 if (!(val % CEPH_CAPS_PER_RELEASE)) {
2018 atomic_set(&mdsc->cap_reclaim_pending, 0);
2019 ceph_queue_cap_reclaim_work(mdsc);
2020 }
2021}
2022
2f2dc053
SW		 2023/*
2024 * requests
2025 */
2026
54008399
YZ		 2027int ceph_alloc_readdir_reply_buffer(struct ceph_mds_request *req,
2028 struct inode *dir)
2029{
2030 struct ceph_inode_info *ci = ceph_inode(dir);
2031 struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
2032 struct ceph_mount_options *opt = req->r_mdsc->fsc->mount_options;
2a5beea3 2033 size_t size = sizeof(struct ceph_mds_reply_dir_entry);
54008399
YZ		 2034 int order, num_entries;
2035
2036 spin_lock(&ci->i_ceph_lock);
2037 num_entries = ci->i_files + ci->i_subdirs;
2038 spin_unlock(&ci->i_ceph_lock);
2039 num_entries = max(num_entries, 1);
2040 num_entries = min(num_entries, opt->max_readdir);
2041
2042 order = get_order(size * num_entries);
2043 while (order >= 0) {
2a5beea3
YZ		 2044 rinfo->dir_entries = (void*)__get_free_pages(GFP_KERNEL |
2045 __GFP_NOWARN,
2046 order);
2047 if (rinfo->dir_entries)
54008399
YZ		 2048 break;
2049 order--;
2050 }
2a5beea3 2051 if (!rinfo->dir_entries)
54008399
YZ		 2052 return -ENOMEM;
2053
2054 num_entries = (PAGE_SIZE << order) / size;
2055 num_entries = min(num_entries, opt->max_readdir);
2056
2057 rinfo->dir_buf_size = PAGE_SIZE << order;
2058 req->r_num_caps = num_entries + 1;
2059 req->r_args.readdir.max_entries = cpu_to_le32(num_entries);
2060 req->r_args.readdir.max_bytes = cpu_to_le32(opt->max_readdir_bytes);
2061 return 0;
2062}
2063
2f2dc053
SW		 2064/*
2065 * Create an mds request.
2066 */
2067struct ceph_mds_request *
2068ceph_mdsc_create_request(struct ceph_mds_client *mdsc, int op, int mode)
2069{
2070 struct ceph_mds_request *req = kzalloc(sizeof(*req), GFP_NOFS);
63ecae7e 2071 struct timespec64 ts;
2f2dc053
SW		 2072
2073 if (!req)
2074 return ERR_PTR(-ENOMEM);
2075
b4556396 2076 mutex_init(&req->r_fill_mutex);
37151668 2077 req->r_mdsc = mdsc;
2f2dc053
SW		 2078 req->r_started = jiffies;
2079 req->r_resend_mds = -1;
2080 INIT_LIST_HEAD(&req->r_unsafe_dir_item);
68cd5b4b 2081 INIT_LIST_HEAD(&req->r_unsafe_target_item);
2f2dc053 2082 req->r_fmode = -1;
153c8e6b 2083 kref_init(&req->r_kref);
fcd00b68 2084 RB_CLEAR_NODE(&req->r_node);
2f2dc053
SW		 2085 INIT_LIST_HEAD(&req->r_wait);
2086 init_completion(&req->r_completion);
2087 init_completion(&req->r_safe_completion);
2088 INIT_LIST_HEAD(&req->r_unsafe_item);
2089
63ecae7e 2090 ktime_get_coarse_real_ts64(&ts);
0ed1e90a 2091 req->r_stamp = timespec64_trunc(ts, mdsc->fsc->sb->s_time_gran);
b8e69066 2092
2f2dc053
SW		 2093 req->r_op = op;
2094 req->r_direct_mode = mode;
2095 return req;
2096}
2097
2098/*
44ca18f2 2099 * return oldest (lowest) request, tid in request tree, 0 if none.
2f2dc053
SW		 2100 *
2101 * called under mdsc->mutex.
2102 */
44ca18f2
SW		 2103static struct ceph_mds_request *__get_oldest_req(struct ceph_mds_client *mdsc)
2104{
2105 if (RB_EMPTY_ROOT(&mdsc->request_tree))
2106 return NULL;
2107 return rb_entry(rb_first(&mdsc->request_tree),
2108 struct ceph_mds_request, r_node);
2109}
2110
e8a7b8b1 2111static inline u64 __get_oldest_tid(struct ceph_mds_client *mdsc)
2f2dc053 2112{
e8a7b8b1 2113 return mdsc->oldest_tid;
2f2dc053
SW		 2114}
2115
2116/*
2117 * Build a dentry's path. Allocate on heap; caller must kfree. Based
2118 * on build_path_from_dentry in fs/cifs/dir.c.
2119 *
2120 * If @stop_on_nosnap, generate path relative to the first non-snapped
2121 * inode.
2122 *
2123 * Encode hidden .snap dirs as a double /, i.e.
2124 * foo/.snap/bar -> foo//bar
2125 */
69a10fb3 2126char *ceph_mdsc_build_path(struct dentry *dentry, int *plen, u64 *pbase,
2f2dc053
SW		 2127 int stop_on_nosnap)
2128{
2129 struct dentry *temp;
2130 char *path;
f77f21bb 2131 int pos;
1b71fe2e 2132 unsigned seq;
69a10fb3 2133 u64 base;
2f2dc053 2134
d37b1d99 2135 if (!dentry)
2f2dc053
SW		 2136 return ERR_PTR(-EINVAL);
2137
f77f21bb 2138 path = __getname();
d37b1d99 2139 if (!path)
2f2dc053 2140 return ERR_PTR(-ENOMEM);
f77f21bb
JL		 2141retry:
2142 pos = PATH_MAX - 1;
2143 path[pos] = '\0';
2144
2145 seq = read_seqbegin(&rename_lock);
1b71fe2e 2146 rcu_read_lock();
f77f21bb
JL		 2147 temp = dentry;
2148 for (;;) {
1b71fe2e 2149 struct inode *inode;
2f2dc053 2150
1b71fe2e 2151 spin_lock(&temp->d_lock);
2b0143b5 2152 inode = d_inode(temp);
2f2dc053 2153 if (inode && ceph_snap(inode) == CEPH_SNAPDIR) {
104648ad 2154 dout("build_path path+%d: %p SNAPDIR\n",
2f2dc053 2155 pos, temp);
d6b8bd67 2156 } else if (stop_on_nosnap && inode && dentry != temp &&
2f2dc053 2157 ceph_snap(inode) == CEPH_NOSNAP) {
9d5a09e6 2158 spin_unlock(&temp->d_lock);
d6b8bd67 2159 pos++; /* get rid of any prepended '/' */
2f2dc053
SW		 2160 break;
2161 } else {
2162 pos -= temp->d_name.len;
1b71fe2e
AV		 2163 if (pos < 0) {
2164 spin_unlock(&temp->d_lock);
2f2dc053 2165 break;
1b71fe2e 2166 }
f77f21bb 2167 memcpy(path + pos, temp->d_name.name, temp->d_name.len);
2f2dc053 2168 }
1b71fe2e 2169 spin_unlock(&temp->d_lock);
41883ba8 2170 temp = READ_ONCE(temp->d_parent);
f77f21bb
JL		 2171
2172 /* Are we at the root? */
2173 if (IS_ROOT(temp))
2174 break;
2175
2176 /* Are we out of buffer? */
2177 if (--pos < 0)
2178 break;
2179
2180 path[pos] = '/';
2f2dc053 2181 }
69a10fb3 2182 base = ceph_ino(d_inode(temp));
1b71fe2e 2183 rcu_read_unlock();
f77f21bb 2184 if (pos < 0 || read_seqretry(&rename_lock, seq)) {
104648ad 2185 pr_err("build_path did not end path lookup where "
f77f21bb 2186 "expected, pos is %d\n", pos);
2f2dc053
SW		 2187 /* presumably this is only possible if racing with a
2188 rename of one of the parent directories (we can not
2189 lock the dentries above us to prevent this, but
2190 retrying should be harmless) */
2f2dc053
SW		 2191 goto retry;
2192 }
2193
69a10fb3 2194 *pbase = base;
f77f21bb 2195 *plen = PATH_MAX - 1 - pos;
104648ad 2196 dout("build_path on %p %d built %llx '%.*s'\n",
f77f21bb
JL		 2197 dentry, d_count(dentry), base, *plen, path + pos);
2198 return path + pos;
2f2dc053
SW		 2199}
2200
fd36a717 2201static int build_dentry_path(struct dentry *dentry, struct inode *dir,
2f2dc053 2202 const char **ppath, int *ppathlen, u64 *pino,
1bcb3440 2203 bool *pfreepath, bool parent_locked)
2f2dc053
SW		 2204{
2205 char *path;
2206
c6b0b656 2207 rcu_read_lock();
fd36a717
JL		 2208 if (!dir)
2209 dir = d_inode_rcu(dentry->d_parent);
964fff74 2210 if (dir && parent_locked && ceph_snap(dir) == CEPH_NOSNAP) {
c6b0b656
JL		 2211 *pino = ceph_ino(dir);
2212 rcu_read_unlock();
964fff74
JL		 2213 *ppath = dentry->d_name.name;
2214 *ppathlen = dentry->d_name.len;
2f2dc053
SW		 2215 return 0;
2216 }
c6b0b656 2217 rcu_read_unlock();
2f2dc053
SW		 2218 path = ceph_mdsc_build_path(dentry, ppathlen, pino, 1);
2219 if (IS_ERR(path))
2220 return PTR_ERR(path);
2221 *ppath = path;
1bcb3440 2222 *pfreepath = true;
2f2dc053
SW		 2223 return 0;
2224}
2225
2226static int build_inode_path(struct inode *inode,
2227 const char **ppath, int *ppathlen, u64 *pino,
1bcb3440 2228 bool *pfreepath)
2f2dc053
SW		 2229{
2230 struct dentry *dentry;
2231 char *path;
2232
2233 if (ceph_snap(inode) == CEPH_NOSNAP) {
2234 *pino = ceph_ino(inode);
2235 *ppathlen = 0;
2236 return 0;
2237 }
2238 dentry = d_find_alias(inode);
2239 path = ceph_mdsc_build_path(dentry, ppathlen, pino, 1);
2240 dput(dentry);
2241 if (IS_ERR(path))
2242 return PTR_ERR(path);
2243 *ppath = path;
1bcb3440 2244 *pfreepath = true;
2f2dc053
SW		 2245 return 0;
2246}
2247
2248/*
2249 * request arguments may be specified via an inode *, a dentry *, or
2250 * an explicit ino+path.
2251 */
2252static int set_request_path_attr(struct inode *rinode, struct dentry *rdentry,
fd36a717
JL		 2253 struct inode *rdiri, const char *rpath,
2254 u64 rino, const char **ppath, int *pathlen,
1bcb3440 2255 u64 *ino, bool *freepath, bool parent_locked)
2f2dc053
SW		 2256{
2257 int r = 0;
2258
2259 if (rinode) {
2260 r = build_inode_path(rinode, ppath, pathlen, ino, freepath);
2261 dout(" inode %p %llx.%llx\n", rinode, ceph_ino(rinode),
2262 ceph_snap(rinode));
2263 } else if (rdentry) {
fd36a717 2264 r = build_dentry_path(rdentry, rdiri, ppath, pathlen, ino,
1bcb3440 2265 freepath, parent_locked);
2f2dc053
SW		 2266 dout(" dentry %p %llx/%.*s\n", rdentry, *ino, *pathlen,
2267 *ppath);
795858db 2268 } else if (rpath || rino) {
2f2dc053
SW		 2269 *ino = rino;
2270 *ppath = rpath;
b000056a 2271 *pathlen = rpath ? strlen(rpath) : 0;
2f2dc053
SW		 2272 dout(" path %.*s\n", *pathlen, rpath);
2273 }
2274
2275 return r;
2276}
2277
2278/*
2279 * called under mdsc->mutex
2280 */
2281static struct ceph_msg *create_request_message(struct ceph_mds_client *mdsc,
2282 struct ceph_mds_request *req,
6e6f0923 2283 int mds, bool drop_cap_releases)
2f2dc053
SW		 2284{
2285 struct ceph_msg *msg;
2286 struct ceph_mds_request_head *head;
2287 const char *path1 = NULL;
2288 const char *path2 = NULL;
2289 u64 ino1 = 0, ino2 = 0;
2290 int pathlen1 = 0, pathlen2 = 0;
1bcb3440 2291 bool freepath1 = false, freepath2 = false;
2f2dc053
SW		 2292 int len;
2293 u16 releases;
2294 void *p, *end;
2295 int ret;
2296
2297 ret = set_request_path_attr(req->r_inode, req->r_dentry,
3dd69aab 2298 req->r_parent, req->r_path1, req->r_ino1.ino,
1bcb3440
JL		 2299 &path1, &pathlen1, &ino1, &freepath1,
2300 test_bit(CEPH_MDS_R_PARENT_LOCKED,
2301 &req->r_req_flags));
2f2dc053
SW		 2302 if (ret < 0) {
2303 msg = ERR_PTR(ret);
2304 goto out;
2305 }
2306
1bcb3440 2307 /* If r_old_dentry is set, then assume that its parent is locked */
2f2dc053 2308 ret = set_request_path_attr(NULL, req->r_old_dentry,
fd36a717 2309 req->r_old_dentry_dir,
2f2dc053 2310 req->r_path2, req->r_ino2.ino,
1bcb3440 2311 &path2, &pathlen2, &ino2, &freepath2, true);
2f2dc053
SW		 2312 if (ret < 0) {
2313 msg = ERR_PTR(ret);
2314 goto out_free1;
2315 }
2316
2317 len = sizeof(*head) +
b8e69066 2318 pathlen1 + pathlen2 + 2*(1 + sizeof(u32) + sizeof(u64)) +
777d738a 2319 sizeof(struct ceph_timespec);
2f2dc053
SW		 2320
2321 /* calculate (max) length for cap releases */
2322 len += sizeof(struct ceph_mds_request_release) *
2323 (!!req->r_inode_drop + !!req->r_dentry_drop +
2324 !!req->r_old_inode_drop + !!req->r_old_dentry_drop);
2325 if (req->r_dentry_drop)
c1dfc277 2326 len += pathlen1;
2f2dc053 2327 if (req->r_old_dentry_drop)
c1dfc277 2328 len += pathlen2;
2f2dc053 2329
0d9c1ab3 2330 msg = ceph_msg_new2(CEPH_MSG_CLIENT_REQUEST, len, 1, GFP_NOFS, false);
a79832f2
SW		 2331 if (!msg) {
2332 msg = ERR_PTR(-ENOMEM);
2f2dc053 2333 goto out_free2;
a79832f2 2334 }
2f2dc053 2335
7cfa0313 2336 msg->hdr.version = cpu_to_le16(2);
6df058c0
SW		 2337 msg->hdr.tid = cpu_to_le64(req->r_tid);
2338
2f2dc053
SW		 2339 head = msg->front.iov_base;
2340 p = msg->front.iov_base + sizeof(*head);
2341 end = msg->front.iov_base + msg->front.iov_len;
2342
2343 head->mdsmap_epoch = cpu_to_le32(mdsc->mdsmap->m_epoch);
2344 head->op = cpu_to_le32(req->r_op);
ff3d0046
EB		 2345 head->caller_uid = cpu_to_le32(from_kuid(&init_user_ns, req->r_uid));
2346 head->caller_gid = cpu_to_le32(from_kgid(&init_user_ns, req->r_gid));
2f2dc053
SW		 2347 head->args = req->r_args;
2348
2349 ceph_encode_filepath(&p, end, ino1, path1);
2350 ceph_encode_filepath(&p, end, ino2, path2);
2351
e979cf50
SW		 2352 /* make note of release offset, in case we need to replay */
2353 req->r_request_release_offset = p - msg->front.iov_base;
2354
2f2dc053
SW		 2355 /* cap releases */
2356 releases = 0;
2357 if (req->r_inode_drop)
2358 releases += ceph_encode_inode_release(&p,
2b0143b5 2359 req->r_inode ? req->r_inode : d_inode(req->r_dentry),
2f2dc053
SW		 2360 mds, req->r_inode_drop, req->r_inode_unless, 0);
2361 if (req->r_dentry_drop)
2362 releases += ceph_encode_dentry_release(&p, req->r_dentry,
3dd69aab 2363 req->r_parent, mds, req->r_dentry_drop,
ca6c8ae0 2364 req->r_dentry_unless);
2f2dc053
SW		 2365 if (req->r_old_dentry_drop)
2366 releases += ceph_encode_dentry_release(&p, req->r_old_dentry,
ca6c8ae0
JL		 2367 req->r_old_dentry_dir, mds,
2368 req->r_old_dentry_drop,
2369 req->r_old_dentry_unless);
2f2dc053
SW		 2370 if (req->r_old_inode_drop)
2371 releases += ceph_encode_inode_release(&p,
2b0143b5 2372 d_inode(req->r_old_dentry),
2f2dc053 2373 mds, req->r_old_inode_drop, req->r_old_inode_unless, 0);
6e6f0923
YZ		 2374
2375 if (drop_cap_releases) {
2376 releases = 0;
2377 p = msg->front.iov_base + req->r_request_release_offset;
2378 }
2379
2f2dc053
SW		 2380 head->num_releases = cpu_to_le16(releases);
2381
b8e69066 2382 /* time stamp */
1f041a89
YZ		 2383 {
2384 struct ceph_timespec ts;
0ed1e90a 2385 ceph_encode_timespec64(&ts, &req->r_stamp);
1f041a89
YZ		 2386 ceph_encode_copy(&p, &ts, sizeof(ts));
2387 }
b8e69066 2388
2f2dc053
SW		 2389 BUG_ON(p > end);
2390 msg->front.iov_len = p - msg->front.iov_base;
2391 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
2392
25e6bae3
YZ		 2393 if (req->r_pagelist) {
2394 struct ceph_pagelist *pagelist = req->r_pagelist;
25e6bae3
YZ		 2395 ceph_msg_data_add_pagelist(msg, pagelist);
2396 msg->hdr.data_len = cpu_to_le32(pagelist->length);
2397 } else {
2398 msg->hdr.data_len = 0;
ebf18f47 2399 }
02afca6c 2400
2f2dc053
SW		 2401 msg->hdr.data_off = cpu_to_le16(0);
2402
2403out_free2:
2404 if (freepath2)
f77f21bb 2405 ceph_mdsc_free_path((char *)path2, pathlen2);
2f2dc053
SW		 2406out_free1:
2407 if (freepath1)
f77f21bb 2408 ceph_mdsc_free_path((char *)path1, pathlen1);
2f2dc053
SW		 2409out:
2410 return msg;
2411}
2412
2413/*
2414 * called under mdsc->mutex if error, under no mutex if
2415 * success.
2416 */
2417static void complete_request(struct ceph_mds_client *mdsc,
2418 struct ceph_mds_request *req)
2419{
2420 if (req->r_callback)
2421 req->r_callback(mdsc, req);
111c7081 2422 complete_all(&req->r_completion);
2f2dc053
SW		 2423}
2424
2425/*
2426 * called under mdsc->mutex
2427 */
2428static int __prepare_send_request(struct ceph_mds_client *mdsc,
2429 struct ceph_mds_request *req,
6e6f0923 2430 int mds, bool drop_cap_releases)
2f2dc053
SW		 2431{
2432 struct ceph_mds_request_head *rhead;
2433 struct ceph_msg *msg;
2434 int flags = 0;
2435
2f2dc053 2436 req->r_attempts++;
e55b71f8
GF		 2437 if (req->r_inode) {
2438 struct ceph_cap *cap =
2439 ceph_get_cap_for_mds(ceph_inode(req->r_inode), mds);
2440
2441 if (cap)
2442 req->r_sent_on_mseq = cap->mseq;
2443 else
2444 req->r_sent_on_mseq = -1;
2445 }
2f2dc053
SW		 2446 dout("prepare_send_request %p tid %lld %s (attempt %d)\n", req,
2447 req->r_tid, ceph_mds_op_name(req->r_op), req->r_attempts);
2448
bc2de10d 2449 if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) {
c5c9a0bf 2450 void *p;
01a92f17
SW		 2451 /*
2452 * Replay. Do not regenerate message (and rebuild
2453 * paths, etc.); just use the original message.
2454 * Rebuilding paths will break for renames because
2455 * d_move mangles the src name.
2456 */
2457 msg = req->r_request;
2458 rhead = msg->front.iov_base;
2459
2460 flags = le32_to_cpu(rhead->flags);
2461 flags |= CEPH_MDS_FLAG_REPLAY;
2462 rhead->flags = cpu_to_le32(flags);
2463
2464 if (req->r_target_inode)
2465 rhead->ino = cpu_to_le64(ceph_ino(req->r_target_inode));
2466
2467 rhead->num_retry = req->r_attempts - 1;
e979cf50
SW		 2468
2469 /* remove cap/dentry releases from message */
2470 rhead->num_releases = 0;
c5c9a0bf
YZ		 2471
2472 /* time stamp */
2473 p = msg->front.iov_base + req->r_request_release_offset;
1f041a89
YZ		 2474 {
2475 struct ceph_timespec ts;
0ed1e90a 2476 ceph_encode_timespec64(&ts, &req->r_stamp);
1f041a89
YZ		 2477 ceph_encode_copy(&p, &ts, sizeof(ts));
2478 }
c5c9a0bf
YZ		 2479
2480 msg->front.iov_len = p - msg->front.iov_base;
2481 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
01a92f17
SW		 2482 return 0;
2483 }
2484
2f2dc053
SW		 2485 if (req->r_request) {
2486 ceph_msg_put(req->r_request);
2487 req->r_request = NULL;
2488 }
6e6f0923 2489 msg = create_request_message(mdsc, req, mds, drop_cap_releases);
2f2dc053 2490 if (IS_ERR(msg)) {
e1518c7c 2491 req->r_err = PTR_ERR(msg);
a79832f2 2492 return PTR_ERR(msg);
2f2dc053
SW		 2493 }
2494 req->r_request = msg;
2495
2496 rhead = msg->front.iov_base;
2f2dc053 2497 rhead->oldest_client_tid = cpu_to_le64(__get_oldest_tid(mdsc));
bc2de10d 2498 if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags))
2f2dc053 2499 flags |= CEPH_MDS_FLAG_REPLAY;
3dd69aab 2500 if (req->r_parent)
2f2dc053
SW		 2501 flags |= CEPH_MDS_FLAG_WANT_DENTRY;
2502 rhead->flags = cpu_to_le32(flags);
2503 rhead->num_fwd = req->r_num_fwd;
2504 rhead->num_retry = req->r_attempts - 1;
01a92f17 2505 rhead->ino = 0;
2f2dc053 2506
3dd69aab 2507 dout(" r_parent = %p\n", req->r_parent);
2f2dc053
SW		 2508 return 0;
2509}
2510
2511/*
2512 * send request, or put it on the appropriate wait list.
2513 */
d5548492 2514static void __do_request(struct ceph_mds_client *mdsc,
2f2dc053
SW		 2515 struct ceph_mds_request *req)
2516{
2517 struct ceph_mds_session *session = NULL;
2518 int mds = -1;
48fec5d0 2519 int err = 0;
2f2dc053 2520
bc2de10d
JL		 2521 if (req->r_err || test_bit(CEPH_MDS_R_GOT_RESULT, &req->r_req_flags)) {
2522 if (test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags))
eb1b8af3 2523 __unregister_request(mdsc, req);
d5548492 2524 return;
eb1b8af3 2525 }
2f2dc053
SW		 2526
2527 if (req->r_timeout &&
2528 time_after_eq(jiffies, req->r_started + req->r_timeout)) {
2529 dout("do_request timed out\n");
2530 err = -EIO;
2531 goto finish;
2532 }
52953d55 2533 if (READ_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_SHUTDOWN) {
48fec5d0
YZ		 2534 dout("do_request forced umount\n");
2535 err = -EIO;
2536 goto finish;
2537 }
52953d55 2538 if (READ_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_MOUNTING) {
e9e427f0
YZ		 2539 if (mdsc->mdsmap_err) {
2540 err = mdsc->mdsmap_err;
2541 dout("do_request mdsmap err %d\n", err);
2542 goto finish;
2543 }
cc8e8342
YZ		 2544 if (mdsc->mdsmap->m_epoch == 0) {
2545 dout("do_request no mdsmap, waiting for map\n");
2546 list_add(&req->r_wait, &mdsc->waiting_for_map);
d5548492 2547 return;
cc8e8342 2548 }
e9e427f0
YZ		 2549 if (!(mdsc->fsc->mount_options->flags &
2550 CEPH_MOUNT_OPT_MOUNTWAIT) &&
2551 !ceph_mdsmap_is_cluster_available(mdsc->mdsmap)) {
2552 err = -ENOENT;
2553 pr_info("probably no mds server is up\n");
2554 goto finish;
2555 }
2556 }
2f2dc053 2557
dc69e2e9
SW		 2558 put_request_session(req);
2559
2f2dc053
SW		 2560 mds = __choose_mds(mdsc, req);
2561 if (mds < 0 ||
2562 ceph_mdsmap_get_state(mdsc->mdsmap, mds) < CEPH_MDS_STATE_ACTIVE) {
2563 dout("do_request no mds or not active, waiting for map\n");
2564 list_add(&req->r_wait, &mdsc->waiting_for_map);
d5548492 2565 return;
2f2dc053
SW		 2566 }
2567
2568 /* get, open session */
2569 session = __ceph_lookup_mds_session(mdsc, mds);
9c423956 2570 if (!session) {
2f2dc053 2571 session = register_session(mdsc, mds);
9c423956
SW		 2572 if (IS_ERR(session)) {
2573 err = PTR_ERR(session);
2574 goto finish;
2575 }
2576 }
dc69e2e9
SW		 2577 req->r_session = get_session(session);
2578
2f2dc053 2579 dout("do_request mds%d session %p state %s\n", mds, session,
a687ecaf 2580 ceph_session_state_name(session->s_state));
2f2dc053
SW		 2581 if (session->s_state != CEPH_MDS_SESSION_OPEN &&
2582 session->s_state != CEPH_MDS_SESSION_HUNG) {
fcff415c
YZ		 2583 if (session->s_state == CEPH_MDS_SESSION_REJECTED) {
2584 err = -EACCES;
2585 goto out_session;
2586 }
2f2dc053
SW		 2587 if (session->s_state == CEPH_MDS_SESSION_NEW ||
2588 session->s_state == CEPH_MDS_SESSION_CLOSING)
2589 __open_session(mdsc, session);
2590 list_add(&req->r_wait, &session->s_waiting);
2591 goto out_session;
2592 }
2593
2594 /* send request */
2f2dc053
SW		 2595 req->r_resend_mds = -1; /* forget any previous mds hint */
2596
2597 if (req->r_request_started == 0) /* note request start time */
2598 req->r_request_started = jiffies;
2599
6e6f0923 2600 err = __prepare_send_request(mdsc, req, mds, false);
2f2dc053
SW		 2601 if (!err) {
2602 ceph_msg_get(req->r_request);
2603 ceph_con_send(&session->s_con, req->r_request);
2604 }
2605
2606out_session:
2607 ceph_put_mds_session(session);
48fec5d0
YZ		 2608finish:
2609 if (err) {
2610 dout("__do_request early error %d\n", err);
2611 req->r_err = err;
2612 complete_request(mdsc, req);
2613 __unregister_request(mdsc, req);
2614 }
d5548492 2615 return;
2f2dc053
SW		 2616}
2617
2618/*
2619 * called under mdsc->mutex
2620 */
2621static void __wake_requests(struct ceph_mds_client *mdsc,
2622 struct list_head *head)
2623{
ed75ec2c
YZ		 2624 struct ceph_mds_request *req;
2625 LIST_HEAD(tmp_list);
2626
2627 list_splice_init(head, &tmp_list);
2f2dc053 2628
ed75ec2c
YZ		 2629 while (!list_empty(&tmp_list)) {
2630 req = list_entry(tmp_list.next,
2631 struct ceph_mds_request, r_wait);
2f2dc053 2632 list_del_init(&req->r_wait);
7971bd92 2633 dout(" wake request %p tid %llu\n", req, req->r_tid);
2f2dc053
SW		 2634 __do_request(mdsc, req);
2635 }
2636}
2637
2638/*
2639 * Wake up threads with requests pending for @mds, so that they can
29790f26 2640 * resubmit their requests to a possibly different mds.
2f2dc053 2641 */
29790f26 2642static void kick_requests(struct ceph_mds_client *mdsc, int mds)
2f2dc053 2643{
44ca18f2 2644 struct ceph_mds_request *req;
282c1052 2645 struct rb_node *p = rb_first(&mdsc->request_tree);
2f2dc053
SW		 2646
2647 dout("kick_requests mds%d\n", mds);
282c1052 2648 while (p) {
44ca18f2 2649 req = rb_entry(p, struct ceph_mds_request, r_node);
282c1052 2650 p = rb_next(p);
bc2de10d 2651 if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags))
44ca18f2 2652 continue;
3de22be6
YZ		 2653 if (req->r_attempts > 0)
2654 continue; /* only new requests */
44ca18f2
SW		 2655 if (req->r_session &&
2656 req->r_session->s_mds == mds) {
2657 dout(" kicking tid %llu\n", req->r_tid);
03974e81 2658 list_del_init(&req->r_wait);
44ca18f2 2659 __do_request(mdsc, req);
2f2dc053
SW		 2660 }
2661 }
2662}
2663
86bda539 2664int ceph_mdsc_submit_request(struct ceph_mds_client *mdsc, struct inode *dir,
2f2dc053
SW		 2665 struct ceph_mds_request *req)
2666{
86bda539
JL		 2667 int err;
2668
2669 /* take CAP_PIN refs for r_inode, r_parent, r_old_dentry */
2670 if (req->r_inode)
2671 ceph_get_cap_refs(ceph_inode(req->r_inode), CEPH_CAP_PIN);
2672 if (req->r_parent)
2673 ceph_get_cap_refs(ceph_inode(req->r_parent), CEPH_CAP_PIN);
2674 if (req->r_old_dentry_dir)
2675 ceph_get_cap_refs(ceph_inode(req->r_old_dentry_dir),
2676 CEPH_CAP_PIN);
2677
2678 dout("submit_request on %p for inode %p\n", req, dir);
2f2dc053 2679 mutex_lock(&mdsc->mutex);
86bda539 2680 __register_request(mdsc, req, dir);
2f2dc053 2681 __do_request(mdsc, req);
86bda539 2682 err = req->r_err;
2f2dc053 2683 mutex_unlock(&mdsc->mutex);
86bda539 2684 return err;
2f2dc053
SW		 2685}
2686
8340f22c
JL		 2687static int ceph_mdsc_wait_request(struct ceph_mds_client *mdsc,
2688 struct ceph_mds_request *req)
2f2dc053
SW		 2689{
2690 int err;
2691
e1518c7c 2692 /* wait */
e1518c7c 2693 dout("do_request waiting\n");
5be73034 2694 if (!req->r_timeout && req->r_wait_for_completion) {
9280be24 2695 err = req->r_wait_for_completion(mdsc, req);
e1518c7c 2696 } else {
5be73034
ID		 2697 long timeleft = wait_for_completion_killable_timeout(
2698 &req->r_completion,
2699 ceph_timeout_jiffies(req->r_timeout));
2700 if (timeleft > 0)
2701 err = 0;
2702 else if (!timeleft)
2703 err = -EIO; /* timed out */
2704 else
2705 err = timeleft; /* killed */
e1518c7c
SW		 2706 }
2707 dout("do_request waited, got %d\n", err);
2708 mutex_lock(&mdsc->mutex);
5b1daecd 2709
e1518c7c 2710 /* only abort if we didn't race with a real reply */
bc2de10d 2711 if (test_bit(CEPH_MDS_R_GOT_RESULT, &req->r_req_flags)) {
e1518c7c
SW		 2712 err = le32_to_cpu(req->r_reply_info.head->result);
2713 } else if (err < 0) {
2714 dout("aborted request %lld with %d\n", req->r_tid, err);
b4556396
SW		 2715
2716 /*
2717 * ensure we aren't running concurrently with
2718 * ceph_fill_trace or ceph_readdir_prepopulate, which
2719 * rely on locks (dir mutex) held by our caller.
2720 */
2721 mutex_lock(&req->r_fill_mutex);
e1518c7c 2722 req->r_err = err;
bc2de10d 2723 set_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags);
b4556396 2724 mutex_unlock(&req->r_fill_mutex);
5b1daecd 2725
3dd69aab 2726 if (req->r_parent &&
167c9e35
SW		 2727 (req->r_op & CEPH_MDS_OP_WRITE))
2728 ceph_invalidate_dir_request(req);
2f2dc053 2729 } else {
e1518c7c 2730 err = req->r_err;
2f2dc053 2731 }
2f2dc053 2732
e1518c7c 2733 mutex_unlock(&mdsc->mutex);
8340f22c
JL		 2734 return err;
2735}
2736
2737/*
2738 * Synchrously perform an mds request. Take care of all of the
2739 * session setup, forwarding, retry details.
2740 */
2741int ceph_mdsc_do_request(struct ceph_mds_client *mdsc,
2742 struct inode *dir,
2743 struct ceph_mds_request *req)
2744{
2745 int err;
2746
2747 dout("do_request on %p\n", req);
2748
2749 /* issue */
2750 err = ceph_mdsc_submit_request(mdsc, dir, req);
2751 if (!err)
2752 err = ceph_mdsc_wait_request(mdsc, req);
2f2dc053
SW		 2753 dout("do_request %p done, result %d\n", req, err);
2754 return err;
2755}
2756
167c9e35 2757/*
2f276c51 2758 * Invalidate dir's completeness, dentry lease state on an aborted MDS
167c9e35
SW		 2759 * namespace request.
2760 */
2761void ceph_invalidate_dir_request(struct ceph_mds_request *req)
2762{
8d8f371c
YZ		 2763 struct inode *dir = req->r_parent;
2764 struct inode *old_dir = req->r_old_dentry_dir;
167c9e35 2765
8d8f371c 2766 dout("invalidate_dir_request %p %p (complete, lease(s))\n", dir, old_dir);
167c9e35 2767
8d8f371c
YZ		 2768 ceph_dir_clear_complete(dir);
2769 if (old_dir)
2770 ceph_dir_clear_complete(old_dir);
167c9e35
SW		 2771 if (req->r_dentry)
2772 ceph_invalidate_dentry_lease(req->r_dentry);
2773 if (req->r_old_dentry)
2774 ceph_invalidate_dentry_lease(req->r_old_dentry);
2775}
2776
2f2dc053
SW		 2777/*
2778 * Handle mds reply.
2779 *
2780 * We take the session mutex and parse and process the reply immediately.
2781 * This preserves the logical ordering of replies, capabilities, etc., sent
2782 * by the MDS as they are applied to our local cache.
2783 */
2784static void handle_reply(struct ceph_mds_session *session, struct ceph_msg *msg)
2785{
2786 struct ceph_mds_client *mdsc = session->s_mdsc;
2787 struct ceph_mds_request *req;
2788 struct ceph_mds_reply_head *head = msg->front.iov_base;
2789 struct ceph_mds_reply_info_parsed *rinfo; /* parsed reply info */
982d6011 2790 struct ceph_snap_realm *realm;
2f2dc053
SW		 2791 u64 tid;
2792 int err, result;
2600d2dd 2793 int mds = session->s_mds;
2f2dc053 2794
2f2dc053
SW		 2795 if (msg->front.iov_len < sizeof(*head)) {
2796 pr_err("mdsc_handle_reply got corrupt (short) reply\n");
9ec7cab1 2797 ceph_msg_dump(msg);
2f2dc053
SW		 2798 return;
2799 }
2800
2801 /* get request, session */
6df058c0 2802 tid = le64_to_cpu(msg->hdr.tid);
2f2dc053 2803 mutex_lock(&mdsc->mutex);
fcd00b68 2804 req = lookup_get_request(mdsc, tid);
2f2dc053
SW		 2805 if (!req) {
2806 dout("handle_reply on unknown tid %llu\n", tid);
2807 mutex_unlock(&mdsc->mutex);
2808 return;
2809 }
2810 dout("handle_reply %p\n", req);
2f2dc053
SW		 2811
2812 /* correct session? */
d96d6049 2813 if (req->r_session != session) {
2f2dc053
SW		 2814 pr_err("mdsc_handle_reply got %llu on session mds%d"
2815 " not mds%d\n", tid, session->s_mds,
2816 req->r_session ? req->r_session->s_mds : -1);
2817 mutex_unlock(&mdsc->mutex);
2818 goto out;
2819 }
2820
2821 /* dup? */
bc2de10d
JL		 2822 if ((test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags) && !head->safe) ||
2823 (test_bit(CEPH_MDS_R_GOT_SAFE, &req->r_req_flags) && head->safe)) {
f3ae1b97 2824 pr_warn("got a dup %s reply on %llu from mds%d\n",
2f2dc053
SW		 2825 head->safe ? "safe" : "unsafe", tid, mds);
2826 mutex_unlock(&mdsc->mutex);
2827 goto out;
2828 }
bc2de10d 2829 if (test_bit(CEPH_MDS_R_GOT_SAFE, &req->r_req_flags)) {
f3ae1b97 2830 pr_warn("got unsafe after safe on %llu from mds%d\n",
85792d0d
SW		 2831 tid, mds);
2832 mutex_unlock(&mdsc->mutex);
2833 goto out;
2834 }
2f2dc053
SW		 2835
2836 result = le32_to_cpu(head->result);
2837
2838 /*
e55b71f8
GF		 2839 * Handle an ESTALE
2840 * if we're not talking to the authority, send to them
2841 * if the authority has changed while we weren't looking,
2842 * send to new authority
2843 * Otherwise we just have to return an ESTALE
2f2dc053
SW		 2844 */
2845 if (result == -ESTALE) {
4c069a58 2846 dout("got ESTALE on request %llu\n", req->r_tid);
51da8e8c 2847 req->r_resend_mds = -1;
ca18bede 2848 if (req->r_direct_mode != USE_AUTH_MDS) {
4c069a58 2849 dout("not using auth, setting for that now\n");
e55b71f8 2850 req->r_direct_mode = USE_AUTH_MDS;
2f2dc053
SW		 2851 __do_request(mdsc, req);
2852 mutex_unlock(&mdsc->mutex);
2853 goto out;
e55b71f8 2854 } else {
ca18bede
YZ		 2855 int mds = __choose_mds(mdsc, req);
2856 if (mds >= 0 && mds != req->r_session->s_mds) {
4c069a58 2857 dout("but auth changed, so resending\n");
e55b71f8
GF		 2858 __do_request(mdsc, req);
2859 mutex_unlock(&mdsc->mutex);
2860 goto out;
2861 }
2f2dc053 2862 }
4c069a58 2863 dout("have to return ESTALE on request %llu\n", req->r_tid);
2f2dc053
SW		 2864 }
2865
e55b71f8 2866
2f2dc053 2867 if (head->safe) {
bc2de10d 2868 set_bit(CEPH_MDS_R_GOT_SAFE, &req->r_req_flags);
2f2dc053 2869 __unregister_request(mdsc, req);
2f2dc053 2870
bc2de10d 2871 if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) {
2f2dc053
SW		 2872 /*
2873 * We already handled the unsafe response, now do the
2874 * cleanup. No need to examine the response; the MDS
2875 * doesn't include any result info in the safe
2876 * response. And even if it did, there is nothing
2877 * useful we could do with a revised return value.
2878 */
2879 dout("got safe reply %llu, mds%d\n", tid, mds);
2f2dc053
SW		 2880
2881 /* last unsafe request during umount? */
44ca18f2 2882 if (mdsc->stopping && !__get_oldest_req(mdsc))
03066f23 2883 complete_all(&mdsc->safe_umount_waiters);
2f2dc053
SW		 2884 mutex_unlock(&mdsc->mutex);
2885 goto out;
2886 }
e1518c7c 2887 } else {
bc2de10d 2888 set_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags);
2f2dc053 2889 list_add_tail(&req->r_unsafe_item, &req->r_session->s_unsafe);
4c06ace8
YZ		 2890 if (req->r_unsafe_dir) {
2891 struct ceph_inode_info *ci =
2892 ceph_inode(req->r_unsafe_dir);
2893 spin_lock(&ci->i_unsafe_lock);
2894 list_add_tail(&req->r_unsafe_dir_item,
2895 &ci->i_unsafe_dirops);
2896 spin_unlock(&ci->i_unsafe_lock);
2897 }
2f2dc053
SW		 2898 }
2899
2900 dout("handle_reply tid %lld result %d\n", tid, result);
2901 rinfo = &req->r_reply_info;
b37fe1f9
YZ		 2902 if (test_bit(CEPHFS_FEATURE_REPLY_ENCODING, &session->s_features))
2903 err = parse_reply_info(msg, rinfo, (u64)-1);
2904 else
2905 err = parse_reply_info(msg, rinfo, session->s_con.peer_features);
2f2dc053
SW		 2906 mutex_unlock(&mdsc->mutex);
2907
2908 mutex_lock(&session->s_mutex);
2909 if (err < 0) {
25933abd 2910 pr_err("mdsc_handle_reply got corrupt reply mds%d(tid:%lld)\n", mds, tid);
9ec7cab1 2911 ceph_msg_dump(msg);
2f2dc053
SW		 2912 goto out_err;
2913 }
2914
2915 /* snap trace */
982d6011 2916 realm = NULL;
2f2dc053
SW		 2917 if (rinfo->snapblob_len) {
2918 down_write(&mdsc->snap_rwsem);
2919 ceph_update_snap_trace(mdsc, rinfo->snapblob,
982d6011
YZ		 2920 rinfo->snapblob + rinfo->snapblob_len,
2921 le32_to_cpu(head->op) == CEPH_MDS_OP_RMSNAP,
2922 &realm);
2f2dc053
SW		 2923 downgrade_write(&mdsc->snap_rwsem);
2924 } else {
2925 down_read(&mdsc->snap_rwsem);
2926 }
2927
2928 /* insert trace into our cache */
b4556396 2929 mutex_lock(&req->r_fill_mutex);
315f2408 2930 current->journal_info = req;
f5a03b08 2931 err = ceph_fill_trace(mdsc->fsc->sb, req);
2f2dc053 2932 if (err == 0) {
6e8575fa 2933 if (result == 0 && (req->r_op == CEPH_MDS_OP_READDIR ||
81c6aea5 2934 req->r_op == CEPH_MDS_OP_LSSNAP))
2f2dc053 2935 ceph_readdir_prepopulate(req, req->r_session);
2f2dc053 2936 }
315f2408 2937 current->journal_info = NULL;
b4556396 2938 mutex_unlock(&req->r_fill_mutex);
2f2dc053
SW		 2939
2940 up_read(&mdsc->snap_rwsem);
982d6011
YZ		 2941 if (realm)
2942 ceph_put_snap_realm(mdsc, realm);
68cd5b4b 2943
fe33032d
YZ		 2944 if (err == 0) {
2945 if (req->r_target_inode &&
2946 test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) {
2947 struct ceph_inode_info *ci =
2948 ceph_inode(req->r_target_inode);
2949 spin_lock(&ci->i_unsafe_lock);
2950 list_add_tail(&req->r_unsafe_target_item,
2951 &ci->i_unsafe_iops);
2952 spin_unlock(&ci->i_unsafe_lock);
2953 }
2954
2955 ceph_unreserve_caps(mdsc, &req->r_caps_reservation);
68cd5b4b 2956 }
2f2dc053 2957out_err:
e1518c7c 2958 mutex_lock(&mdsc->mutex);
bc2de10d 2959 if (!test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags)) {
e1518c7c
SW		 2960 if (err) {
2961 req->r_err = err;
2962 } else {
5fdb1389 2963 req->r_reply = ceph_msg_get(msg);
bc2de10d 2964 set_bit(CEPH_MDS_R_GOT_RESULT, &req->r_req_flags);
e1518c7c 2965 }
2f2dc053 2966 } else {
e1518c7c 2967 dout("reply arrived after request %lld was aborted\n", tid);
2f2dc053 2968 }
e1518c7c 2969 mutex_unlock(&mdsc->mutex);
2f2dc053 2970
2f2dc053
SW		 2971 mutex_unlock(&session->s_mutex);
2972
2973 /* kick calling process */
2974 complete_request(mdsc, req);
2975out:
2976 ceph_mdsc_put_request(req);
2977 return;
2978}
2979
2980
2981
2982/*
2983 * handle mds notification that our request has been forwarded.
2984 */
2600d2dd
SW		 2985static void handle_forward(struct ceph_mds_client *mdsc,
2986 struct ceph_mds_session *session,
2987 struct ceph_msg *msg)
2f2dc053
SW		 2988{
2989 struct ceph_mds_request *req;
a1ea787c 2990 u64 tid = le64_to_cpu(msg->hdr.tid);
2f2dc053
SW		 2991 u32 next_mds;
2992 u32 fwd_seq;
2f2dc053
SW		 2993 int err = -EINVAL;
2994 void *p = msg->front.iov_base;
2995 void *end = p + msg->front.iov_len;
2f2dc053 2996
a1ea787c 2997 ceph_decode_need(&p, end, 2*sizeof(u32), bad);
c89136ea
SW		 2998 next_mds = ceph_decode_32(&p);
2999 fwd_seq = ceph_decode_32(&p);
2f2dc053
SW		 3000
3001 mutex_lock(&mdsc->mutex);
fcd00b68 3002 req = lookup_get_request(mdsc, tid);
2f2dc053 3003 if (!req) {
2a8e5e36 3004 dout("forward tid %llu to mds%d - req dne\n", tid, next_mds);
2f2dc053
SW		 3005 goto out; /* dup reply? */
3006 }
3007
bc2de10d 3008 if (test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags)) {
2a8e5e36
SW		 3009 dout("forward tid %llu aborted, unregistering\n", tid);
3010 __unregister_request(mdsc, req);
3011 } else if (fwd_seq <= req->r_num_fwd) {
3012 dout("forward tid %llu to mds%d - old seq %d <= %d\n",
2f2dc053
SW		 3013 tid, next_mds, req->r_num_fwd, fwd_seq);
3014 } else {
3015 /* resend. forward race not possible; mds would drop */
2a8e5e36
SW		 3016 dout("forward tid %llu to mds%d (we resend)\n", tid, next_mds);
3017 BUG_ON(req->r_err);
bc2de10d 3018 BUG_ON(test_bit(CEPH_MDS_R_GOT_RESULT, &req->r_req_flags));
3de22be6 3019 req->r_attempts = 0;
2f2dc053
SW		 3020 req->r_num_fwd = fwd_seq;
3021 req->r_resend_mds = next_mds;
3022 put_request_session(req);
3023 __do_request(mdsc, req);
3024 }
3025 ceph_mdsc_put_request(req);
3026out:
3027 mutex_unlock(&mdsc->mutex);
3028 return;
3029
3030bad:
3031 pr_err("mdsc_handle_forward decode error err=%d\n", err);
3032}
3033
131d7eb4
YZ		 3034static int __decode_session_metadata(void **p, void *end,
3035 bool *blacklisted)
84bf3950
YZ		 3036{
3037 /* map<string,string> */
3038 u32 n;
131d7eb4 3039 bool err_str;
84bf3950
YZ		 3040 ceph_decode_32_safe(p, end, n, bad);
3041 while (n-- > 0) {
3042 u32 len;
3043 ceph_decode_32_safe(p, end, len, bad);
3044 ceph_decode_need(p, end, len, bad);
131d7eb4 3045 err_str = !strncmp(*p, "error_string", len);
84bf3950
YZ		 3046 *p += len;
3047 ceph_decode_32_safe(p, end, len, bad);
3048 ceph_decode_need(p, end, len, bad);
131d7eb4
YZ		 3049 if (err_str && strnstr(*p, "blacklisted", len))
3050 *blacklisted = true;
84bf3950
YZ		 3051 *p += len;
3052 }
3053 return 0;
3054bad:
3055 return -1;
3056}
3057
2f2dc053
SW		 3058/*
3059 * handle a mds session control message
3060 */
3061static void handle_session(struct ceph_mds_session *session,
3062 struct ceph_msg *msg)
3063{
3064 struct ceph_mds_client *mdsc = session->s_mdsc;
84bf3950
YZ		 3065 int mds = session->s_mds;
3066 int msg_version = le16_to_cpu(msg->hdr.version);
3067 void *p = msg->front.iov_base;
3068 void *end = p + msg->front.iov_len;
3069 struct ceph_mds_session_head *h;
2f2dc053
SW		 3070 u32 op;
3071 u64 seq;
84bf3950 3072 unsigned long features = 0;
2f2dc053 3073 int wake = 0;
131d7eb4 3074 bool blacklisted = false;
2f2dc053 3075
2f2dc053 3076 /* decode */
84bf3950
YZ		 3077 ceph_decode_need(&p, end, sizeof(*h), bad);
3078 h = p;
3079 p += sizeof(*h);
3080
2f2dc053
SW		 3081 op = le32_to_cpu(h->op);
3082 seq = le64_to_cpu(h->seq);
3083
84bf3950
YZ		 3084 if (msg_version >= 3) {
3085 u32 len;
3086 /* version >= 2, metadata */
131d7eb4 3087 if (__decode_session_metadata(&p, end, &blacklisted) < 0)
84bf3950
YZ		 3088 goto bad;
3089 /* version >= 3, feature bits */
3090 ceph_decode_32_safe(&p, end, len, bad);
3091 ceph_decode_need(&p, end, len, bad);
3092 memcpy(&features, p, min_t(size_t, len, sizeof(features)));
3093 p += len;
3094 }
3095
2f2dc053 3096 mutex_lock(&mdsc->mutex);
0a07fc8c
YZ		 3097 if (op == CEPH_SESSION_CLOSE) {
3098 get_session(session);
2600d2dd 3099 __unregister_session(mdsc, session);
0a07fc8c 3100 }
2f2dc053
SW		 3101 /* FIXME: this ttl calculation is generous */
3102 session->s_ttl = jiffies + HZ*mdsc->mdsmap->m_session_autoclose;
3103 mutex_unlock(&mdsc->mutex);
3104
3105 mutex_lock(&session->s_mutex);
3106
3107 dout("handle_session mds%d %s %p state %s seq %llu\n",
3108 mds, ceph_session_op_name(op), session,
a687ecaf 3109 ceph_session_state_name(session->s_state), seq);
2f2dc053
SW		 3110
3111 if (session->s_state == CEPH_MDS_SESSION_HUNG) {
3112 session->s_state = CEPH_MDS_SESSION_OPEN;
3113 pr_info("mds%d came back\n", session->s_mds);
3114 }
3115
3116 switch (op) {
3117 case CEPH_SESSION_OPEN:
29790f26
SW		 3118 if (session->s_state == CEPH_MDS_SESSION_RECONNECTING)
3119 pr_info("mds%d reconnect success\n", session->s_mds);
2f2dc053 3120 session->s_state = CEPH_MDS_SESSION_OPEN;
84bf3950 3121 session->s_features = features;
2f2dc053
SW		 3122 renewed_caps(mdsc, session, 0);
3123 wake = 1;
3124 if (mdsc->stopping)
3125 __close_session(mdsc, session);
3126 break;
3127
3128 case CEPH_SESSION_RENEWCAPS:
3129 if (session->s_renew_seq == seq)
3130 renewed_caps(mdsc, session, 1);
3131 break;
3132
3133 case CEPH_SESSION_CLOSE:
29790f26
SW		 3134 if (session->s_state == CEPH_MDS_SESSION_RECONNECTING)
3135 pr_info("mds%d reconnect denied\n", session->s_mds);
1c841a96 3136 cleanup_session_requests(mdsc, session);
2f2dc053 3137 remove_session_caps(session);
656e4382 3138 wake = 2; /* for good measure */
f3c60c59 3139 wake_up_all(&mdsc->session_close_wq);
2f2dc053
SW		 3140 break;
3141
3142 case CEPH_SESSION_STALE:
3143 pr_info("mds%d caps went stale, renewing\n",
3144 session->s_mds);
d8fb02ab 3145 spin_lock(&session->s_gen_ttl_lock);
2f2dc053 3146 session->s_cap_gen++;
1ce208a6 3147 session->s_cap_ttl = jiffies - 1;
d8fb02ab 3148 spin_unlock(&session->s_gen_ttl_lock);
2f2dc053
SW		 3149 send_renew_caps(mdsc, session);
3150 break;
3151
3152 case CEPH_SESSION_RECALL_STATE:
e30ee581 3153 ceph_trim_caps(mdsc, session, le32_to_cpu(h->max_caps));
2f2dc053
SW		 3154 break;
3155
186e4f7a
YZ		 3156 case CEPH_SESSION_FLUSHMSG:
3157 send_flushmsg_ack(mdsc, session, seq);
3158 break;
3159
03f4fcb0
YZ		 3160 case CEPH_SESSION_FORCE_RO:
3161 dout("force_session_readonly %p\n", session);
3162 spin_lock(&session->s_cap_lock);
3163 session->s_readonly = true;
3164 spin_unlock(&session->s_cap_lock);
d2f8bb27 3165 wake_up_session_caps(session, FORCE_RO);
03f4fcb0
YZ		 3166 break;
3167
fcff415c
YZ		 3168 case CEPH_SESSION_REJECT:
3169 WARN_ON(session->s_state != CEPH_MDS_SESSION_OPENING);
3170 pr_info("mds%d rejected session\n", session->s_mds);
3171 session->s_state = CEPH_MDS_SESSION_REJECTED;
3172 cleanup_session_requests(mdsc, session);
3173 remove_session_caps(session);
131d7eb4
YZ		 3174 if (blacklisted)
3175 mdsc->fsc->blacklisted = true;
fcff415c
YZ		 3176 wake = 2; /* for good measure */
3177 break;
3178
2f2dc053
SW		 3179 default:
3180 pr_err("mdsc_handle_session bad op %d mds%d\n", op, mds);
3181 WARN_ON(1);
3182 }
3183
3184 mutex_unlock(&session->s_mutex);
3185 if (wake) {
3186 mutex_lock(&mdsc->mutex);
3187 __wake_requests(mdsc, &session->s_waiting);
656e4382
YZ		 3188 if (wake == 2)
3189 kick_requests(mdsc, mds);
2f2dc053
SW		 3190 mutex_unlock(&mdsc->mutex);
3191 }
0a07fc8c
YZ		 3192 if (op == CEPH_SESSION_CLOSE)
3193 ceph_put_mds_session(session);
2f2dc053
SW		 3194 return;
3195
3196bad:
3197 pr_err("mdsc_handle_session corrupt message mds%d len %d\n", mds,
3198 (int)msg->front.iov_len);
9ec7cab1 3199 ceph_msg_dump(msg);
2f2dc053
SW		 3200 return;
3201}
3202
3203
3204/*
3205 * called under session->mutex.
3206 */
3207static void replay_unsafe_requests(struct ceph_mds_client *mdsc,
3208 struct ceph_mds_session *session)
3209{
3210 struct ceph_mds_request *req, *nreq;
3de22be6 3211 struct rb_node *p;
2f2dc053
SW		 3212 int err;
3213
3214 dout("replay_unsafe_requests mds%d\n", session->s_mds);
3215
3216 mutex_lock(&mdsc->mutex);
3217 list_for_each_entry_safe(req, nreq, &session->s_unsafe, r_unsafe_item) {
6e6f0923 3218 err = __prepare_send_request(mdsc, req, session->s_mds, true);
2f2dc053
SW		 3219 if (!err) {
3220 ceph_msg_get(req->r_request);
3221 ceph_con_send(&session->s_con, req->r_request);
3222 }
3223 }
3de22be6
YZ		 3224
3225 /*
3226 * also re-send old requests when MDS enters reconnect stage. So that MDS
3227 * can process completed request in clientreplay stage.
3228 */
3229 p = rb_first(&mdsc->request_tree);
3230 while (p) {
3231 req = rb_entry(p, struct ceph_mds_request, r_node);
3232 p = rb_next(p);
bc2de10d 3233 if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags))
3de22be6
YZ		 3234 continue;
3235 if (req->r_attempts == 0)
3236 continue; /* only old requests */
3237 if (req->r_session &&
3238 req->r_session->s_mds == session->s_mds) {
6e6f0923
YZ		 3239 err = __prepare_send_request(mdsc, req,
3240 session->s_mds, true);
3de22be6
YZ		 3241 if (!err) {
3242 ceph_msg_get(req->r_request);
3243 ceph_con_send(&session->s_con, req->r_request);
3244 }
3245 }
3246 }
2f2dc053
SW		 3247 mutex_unlock(&mdsc->mutex);
3248}
3249
81c5a148
YZ		 3250static int send_reconnect_partial(struct ceph_reconnect_state *recon_state)
3251{
3252 struct ceph_msg *reply;
3253 struct ceph_pagelist *_pagelist;
3254 struct page *page;
3255 __le32 *addr;
3256 int err = -ENOMEM;
3257
3258 if (!recon_state->allow_multi)
3259 return -ENOSPC;
3260
3261 /* can't handle message that contains both caps and realm */
3262 BUG_ON(!recon_state->nr_caps == !recon_state->nr_realms);
3263
3264 /* pre-allocate new pagelist */
3265 _pagelist = ceph_pagelist_alloc(GFP_NOFS);
3266 if (!_pagelist)
3267 return -ENOMEM;
3268
3269 reply = ceph_msg_new2(CEPH_MSG_CLIENT_RECONNECT, 0, 1, GFP_NOFS, false);
3270 if (!reply)
3271 goto fail_msg;
3272
3273 /* placeholder for nr_caps */
3274 err = ceph_pagelist_encode_32(_pagelist, 0);
3275 if (err < 0)
3276 goto fail;
3277
3278 if (recon_state->nr_caps) {
3279 /* currently encoding caps */
3280 err = ceph_pagelist_encode_32(recon_state->pagelist, 0);
3281 if (err)
3282 goto fail;
3283 } else {
3284 /* placeholder for nr_realms (currently encoding relams) */
3285 err = ceph_pagelist_encode_32(_pagelist, 0);
3286 if (err < 0)
3287 goto fail;
3288 }
3289
3290 err = ceph_pagelist_encode_8(recon_state->pagelist, 1);
3291 if (err)
3292 goto fail;
3293
3294 page = list_first_entry(&recon_state->pagelist->head, struct page, lru);
3295 addr = kmap_atomic(page);
3296 if (recon_state->nr_caps) {
3297 /* currently encoding caps */
3298 *addr = cpu_to_le32(recon_state->nr_caps);
3299 } else {
3300 /* currently encoding relams */
3301 *(addr + 1) = cpu_to_le32(recon_state->nr_realms);
3302 }
3303 kunmap_atomic(addr);
3304
3305 reply->hdr.version = cpu_to_le16(5);
3306 reply->hdr.compat_version = cpu_to_le16(4);
3307
3308 reply->hdr.data_len = cpu_to_le32(recon_state->pagelist->length);
3309 ceph_msg_data_add_pagelist(reply, recon_state->pagelist);
3310
3311 ceph_con_send(&recon_state->session->s_con, reply);
3312 ceph_pagelist_release(recon_state->pagelist);
3313
3314 recon_state->pagelist = _pagelist;
3315 recon_state->nr_caps = 0;
3316 recon_state->nr_realms = 0;
3317 recon_state->msg_version = 5;
3318 return 0;
3319fail:
3320 ceph_msg_put(reply);
3321fail_msg:
3322 ceph_pagelist_release(_pagelist);
3323 return err;
3324}
3325
2f2dc053
SW		 3326/*
3327 * Encode information about a cap for a reconnect with the MDS.
3328 */
2f2dc053
SW		 3329static int encode_caps_cb(struct inode *inode, struct ceph_cap *cap,
3330 void *arg)
3331{
20cb34ae
SW		 3332 union {
3333 struct ceph_mds_cap_reconnect v2;
3334 struct ceph_mds_cap_reconnect_v1 v1;
3335 } rec;
b3f8d68f 3336 struct ceph_inode_info *ci = cap->ci;
20cb34ae
SW		 3337 struct ceph_reconnect_state *recon_state = arg;
3338 struct ceph_pagelist *pagelist = recon_state->pagelist;
5ccedf1c 3339 int err;
3469ed0d 3340 u64 snap_follows;
2f2dc053 3341
2f2dc053
SW		 3342 dout(" adding %p ino %llx.%llx cap %p %lld %s\n",
3343 inode, ceph_vinop(inode), cap, cap->cap_id,
3344 ceph_cap_string(cap->issued));
2f2dc053 3345
be655596 3346 spin_lock(&ci->i_ceph_lock);
2f2dc053
SW		 3347 cap->seq = 0; /* reset cap seq */
3348 cap->issue_seq = 0; /* and issue_seq */
667ca05c 3349 cap->mseq = 0; /* and migrate_seq */
99a9c273 3350 cap->cap_gen = cap->session->s_cap_gen;
20cb34ae 3351
121f22a1 3352 if (recon_state->msg_version >= 2) {
20cb34ae
SW		 3353 rec.v2.cap_id = cpu_to_le64(cap->cap_id);
3354 rec.v2.wanted = cpu_to_le32(__ceph_caps_wanted(ci));
3355 rec.v2.issued = cpu_to_le32(cap->issued);
3356 rec.v2.snaprealm = cpu_to_le64(ci->i_snap_realm->ino);
5ccedf1c 3357 rec.v2.pathbase = 0;
ec1dff25
JL		 3358 rec.v2.flock_len = (__force __le32)
3359 ((ci->i_ceph_flags & CEPH_I_ERROR_FILELOCK) ? 0 : 1);
20cb34ae
SW		 3360 } else {
3361 rec.v1.cap_id = cpu_to_le64(cap->cap_id);
3362 rec.v1.wanted = cpu_to_le32(__ceph_caps_wanted(ci));
3363 rec.v1.issued = cpu_to_le32(cap->issued);
3364 rec.v1.size = cpu_to_le64(inode->i_size);
9bbeab41
AB		 3365 ceph_encode_timespec64(&rec.v1.mtime, &inode->i_mtime);
3366 ceph_encode_timespec64(&rec.v1.atime, &inode->i_atime);
20cb34ae 3367 rec.v1.snaprealm = cpu_to_le64(ci->i_snap_realm->ino);
5ccedf1c 3368 rec.v1.pathbase = 0;
20cb34ae 3369 }
3469ed0d
YZ		 3370
3371 if (list_empty(&ci->i_cap_snaps)) {
92776fd2 3372 snap_follows = ci->i_head_snapc ? ci->i_head_snapc->seq : 0;
3469ed0d
YZ		 3373 } else {
3374 struct ceph_cap_snap *capsnap =
3375 list_first_entry(&ci->i_cap_snaps,
3376 struct ceph_cap_snap, ci_item);
3377 snap_follows = capsnap->follows;
20cb34ae 3378 }
be655596 3379 spin_unlock(&ci->i_ceph_lock);
2f2dc053 3380
121f22a1 3381 if (recon_state->msg_version >= 2) {
40819f6f 3382 int num_fcntl_locks, num_flock_locks;
4deb14a2 3383 struct ceph_filelock *flocks = NULL;
81c5a148 3384 size_t struct_len, total_len = sizeof(u64);
121f22a1 3385 u8 struct_v = 0;
39be95e9
JS		 3386
3387encode_again:
b3f8d68f
YZ		 3388 if (rec.v2.flock_len) {
3389 ceph_count_locks(inode, &num_fcntl_locks, &num_flock_locks);
3390 } else {
3391 num_fcntl_locks = 0;
3392 num_flock_locks = 0;
3393 }
4deb14a2 3394 if (num_fcntl_locks + num_flock_locks > 0) {
6da2ec56
KC		 3395 flocks = kmalloc_array(num_fcntl_locks + num_flock_locks,
3396 sizeof(struct ceph_filelock),
3397 GFP_NOFS);
4deb14a2
YZ		 3398 if (!flocks) {
3399 err = -ENOMEM;
5ccedf1c 3400 goto out_err;
4deb14a2
YZ		 3401 }
3402 err = ceph_encode_locks_to_buffer(inode, flocks,
3403 num_fcntl_locks,
3404 num_flock_locks);
3405 if (err) {
3406 kfree(flocks);
3407 flocks = NULL;
3408 if (err == -ENOSPC)
3409 goto encode_again;
5ccedf1c 3410 goto out_err;
4deb14a2
YZ		 3411 }
3412 } else {
39be95e9 3413 kfree(flocks);
4deb14a2 3414 flocks = NULL;
39be95e9 3415 }
121f22a1
YZ		 3416
3417 if (recon_state->msg_version >= 3) {
3418 /* version, compat_version and struct_len */
81c5a148 3419 total_len += 2 * sizeof(u8) + sizeof(u32);
3469ed0d 3420 struct_v = 2;
121f22a1 3421 }
39be95e9
JS		 3422 /*
3423 * number of encoded locks is stable, so copy to pagelist
3424 */
121f22a1
YZ		 3425 struct_len = 2 * sizeof(u32) +
3426 (num_fcntl_locks + num_flock_locks) *
3427 sizeof(struct ceph_filelock);
3428 rec.v2.flock_len = cpu_to_le32(struct_len);
3429
5ccedf1c 3430 struct_len += sizeof(u32) + sizeof(rec.v2);
121f22a1 3431
3469ed0d
YZ		 3432 if (struct_v >= 2)
3433 struct_len += sizeof(u64); /* snap_follows */
3434
121f22a1 3435 total_len += struct_len;
81c5a148
YZ		 3436
3437 if (pagelist->length + total_len > RECONNECT_MAX_SIZE) {
3438 err = send_reconnect_partial(recon_state);
3439 if (err)
3440 goto out_freeflocks;
3441 pagelist = recon_state->pagelist;
5ccedf1c 3442 }
121f22a1 3443
81c5a148
YZ		 3444 err = ceph_pagelist_reserve(pagelist, total_len);
3445 if (err)
3446 goto out_freeflocks;
3447
3448 ceph_pagelist_encode_64(pagelist, ceph_ino(inode));
5ccedf1c
YZ		 3449 if (recon_state->msg_version >= 3) {
3450 ceph_pagelist_encode_8(pagelist, struct_v);
3451 ceph_pagelist_encode_8(pagelist, 1);
3452 ceph_pagelist_encode_32(pagelist, struct_len);
121f22a1 3453 }
5ccedf1c
YZ		 3454 ceph_pagelist_encode_string(pagelist, NULL, 0);
3455 ceph_pagelist_append(pagelist, &rec, sizeof(rec.v2));
3456 ceph_locks_to_pagelist(flocks, pagelist,
3457 num_fcntl_locks, num_flock_locks);
3458 if (struct_v >= 2)
3459 ceph_pagelist_encode_64(pagelist, snap_follows);
81c5a148 3460out_freeflocks:
39be95e9 3461 kfree(flocks);
3612abbd 3462 } else {
5ccedf1c
YZ		 3463 u64 pathbase = 0;
3464 int pathlen = 0;
3465 char *path = NULL;
3466 struct dentry *dentry;
3467
3468 dentry = d_find_alias(inode);
3469 if (dentry) {
3470 path = ceph_mdsc_build_path(dentry,
3471 &pathlen, &pathbase, 0);
3472 dput(dentry);
3473 if (IS_ERR(path)) {
3474 err = PTR_ERR(path);
3475 goto out_err;
3476 }
3477 rec.v1.pathbase = cpu_to_le64(pathbase);
121f22a1 3478 }
5ccedf1c
YZ		 3479
3480 err = ceph_pagelist_reserve(pagelist,
81c5a148
YZ		 3481 sizeof(u64) + sizeof(u32) +
3482 pathlen + sizeof(rec.v1));
5ccedf1c 3483 if (err) {
81c5a148 3484 goto out_freepath;
5ccedf1c
YZ		 3485 }
3486
81c5a148 3487 ceph_pagelist_encode_64(pagelist, ceph_ino(inode));
5ccedf1c
YZ		 3488 ceph_pagelist_encode_string(pagelist, path, pathlen);
3489 ceph_pagelist_append(pagelist, &rec, sizeof(rec.v1));
81c5a148 3490out_freepath:
f77f21bb 3491 ceph_mdsc_free_path(path, pathlen);
40819f6f 3492 }
44c99757 3493
5ccedf1c 3494out_err:
81c5a148
YZ		 3495 if (err >= 0)
3496 recon_state->nr_caps++;
3497 return err;
3498}
3499
3500static int encode_snap_realms(struct ceph_mds_client *mdsc,
3501 struct ceph_reconnect_state *recon_state)
3502{
3503 struct rb_node *p;
3504 struct ceph_pagelist *pagelist = recon_state->pagelist;
3505 int err = 0;
3506
3507 if (recon_state->msg_version >= 4) {
3508 err = ceph_pagelist_encode_32(pagelist, mdsc->num_snap_realms);
3509 if (err < 0)
3510 goto fail;
3511 }
3512
3513 /*
3514 * snaprealms. we provide mds with the ino, seq (version), and
3515 * parent for all of our realms. If the mds has any newer info,
3516 * it will tell us.
3517 */
3518 for (p = rb_first(&mdsc->snap_realms); p; p = rb_next(p)) {
3519 struct ceph_snap_realm *realm =
3520 rb_entry(p, struct ceph_snap_realm, node);
3521 struct ceph_mds_snaprealm_reconnect sr_rec;
3522
3523 if (recon_state->msg_version >= 4) {
3524 size_t need = sizeof(u8) * 2 + sizeof(u32) +
3525 sizeof(sr_rec);
3526
3527 if (pagelist->length + need > RECONNECT_MAX_SIZE) {
3528 err = send_reconnect_partial(recon_state);
3529 if (err)
3530 goto fail;
3531 pagelist = recon_state->pagelist;
3532 }
3533
3534 err = ceph_pagelist_reserve(pagelist, need);
3535 if (err)
3536 goto fail;
3537
3538 ceph_pagelist_encode_8(pagelist, 1);
3539 ceph_pagelist_encode_8(pagelist, 1);
3540 ceph_pagelist_encode_32(pagelist, sizeof(sr_rec));
3541 }
3542
3543 dout(" adding snap realm %llx seq %lld parent %llx\n",
3544 realm->ino, realm->seq, realm->parent_ino);
3545 sr_rec.ino = cpu_to_le64(realm->ino);
3546 sr_rec.seq = cpu_to_le64(realm->seq);
3547 sr_rec.parent = cpu_to_le64(realm->parent_ino);
3548
3549 err = ceph_pagelist_append(pagelist, &sr_rec, sizeof(sr_rec));
3550 if (err)
3551 goto fail;
3552
3553 recon_state->nr_realms++;
3554 }
3555fail:
93cea5be 3556 return err;
2f2dc053
SW		 3557}
3558
3559
3560/*
3561 * If an MDS fails and recovers, clients need to reconnect in order to
3562 * reestablish shared state. This includes all caps issued through
3563 * this session _and_ the snap_realm hierarchy. Because it's not
3564 * clear which snap realms the mds cares about, we send everything we
3565 * know about.. that ensures we'll then get any new info the
3566 * recovering MDS might have.
3567 *
3568 * This is a relatively heavyweight operation, but it's rare.
3569 *
3570 * called with mdsc->mutex held.
3571 */
34b6c855
SW		 3572static void send_mds_reconnect(struct ceph_mds_client *mdsc,
3573 struct ceph_mds_session *session)
2f2dc053 3574{
2f2dc053 3575 struct ceph_msg *reply;
34b6c855 3576 int mds = session->s_mds;
9abf82b8 3577 int err = -ENOMEM;
81c5a148
YZ		 3578 struct ceph_reconnect_state recon_state = {
3579 .session = session,
3580 };
c8a96a31 3581 LIST_HEAD(dispose);
2f2dc053 3582
34b6c855 3583 pr_info("mds%d reconnect start\n", mds);
2f2dc053 3584
81c5a148
YZ		 3585 recon_state.pagelist = ceph_pagelist_alloc(GFP_NOFS);
3586 if (!recon_state.pagelist)
93cea5be 3587 goto fail_nopagelist;
93cea5be 3588
0d9c1ab3 3589 reply = ceph_msg_new2(CEPH_MSG_CLIENT_RECONNECT, 0, 1, GFP_NOFS, false);
a79832f2 3590 if (!reply)
93cea5be 3591 goto fail_nomsg;
93cea5be 3592
34b6c855
SW		 3593 mutex_lock(&session->s_mutex);
3594 session->s_state = CEPH_MDS_SESSION_RECONNECTING;
3595 session->s_seq = 0;
2f2dc053 3596
2f2dc053 3597 dout("session %p state %s\n", session,
a687ecaf 3598 ceph_session_state_name(session->s_state));
2f2dc053 3599
99a9c273
YZ		 3600 spin_lock(&session->s_gen_ttl_lock);
3601 session->s_cap_gen++;
3602 spin_unlock(&session->s_gen_ttl_lock);
3603
3604 spin_lock(&session->s_cap_lock);
03f4fcb0
YZ		 3605 /* don't know if session is readonly */
3606 session->s_readonly = 0;
99a9c273
YZ		 3607 /*
3608 * notify __ceph_remove_cap() that we are composing cap reconnect.
3609 * If a cap get released before being added to the cap reconnect,
3610 * __ceph_remove_cap() should skip queuing cap release.
3611 */
3612 session->s_cap_reconnect = 1;
e01a5946 3613 /* drop old cap expires; we're about to reestablish that state */
c8a96a31
JL		 3614 detach_cap_releases(session, &dispose);
3615 spin_unlock(&session->s_cap_lock);
3616 dispose_cap_releases(mdsc, &dispose);
e01a5946 3617
5d23371f 3618 /* trim unused caps to reduce MDS's cache rejoin time */
c0bd50e2
YZ		 3619 if (mdsc->fsc->sb->s_root)
3620 shrink_dcache_parent(mdsc->fsc->sb->s_root);
5d23371f
YZ		 3621
3622 ceph_con_close(&session->s_con);
3623 ceph_con_open(&session->s_con,
3624 CEPH_ENTITY_TYPE_MDS, mds,
3625 ceph_mdsmap_get_addr(mdsc->mdsmap, mds));
3626
3627 /* replay unsafe requests */
3628 replay_unsafe_requests(mdsc, session);
3629
81c5a148
YZ		 3630 ceph_early_kick_flushing_caps(mdsc, session);
3631
5d23371f
YZ		 3632 down_read(&mdsc->snap_rwsem);
3633
81c5a148
YZ		 3634 /* placeholder for nr_caps */
3635 err = ceph_pagelist_encode_32(recon_state.pagelist, 0);
93cea5be
SW		 3636 if (err)
3637 goto fail;
20cb34ae 3638
81c5a148 3639 if (test_bit(CEPHFS_FEATURE_MULTI_RECONNECT, &session->s_features)) {
121f22a1 3640 recon_state.msg_version = 3;
81c5a148
YZ		 3641 recon_state.allow_multi = true;
3642 } else if (session->s_con.peer_features & CEPH_FEATURE_MDSENC) {
3643 recon_state.msg_version = 3;
3644 } else {
23c625ce 3645 recon_state.msg_version = 2;
81c5a148
YZ		 3646 }
3647 /* trsaverse this session's caps */
f5d77269 3648 err = ceph_iterate_session_caps(session, encode_caps_cb, &recon_state);
2f2dc053 3649
99a9c273
YZ		 3650 spin_lock(&session->s_cap_lock);
3651 session->s_cap_reconnect = 0;
3652 spin_unlock(&session->s_cap_lock);
3653
81c5a148
YZ		 3654 if (err < 0)
3655 goto fail;
2f2dc053 3656
81c5a148
YZ		 3657 /* check if all realms can be encoded into current message */
3658 if (mdsc->num_snap_realms) {
3659 size_t total_len =
3660 recon_state.pagelist->length +
3661 mdsc->num_snap_realms *
3662 sizeof(struct ceph_mds_snaprealm_reconnect);
3663 if (recon_state.msg_version >= 4) {
3664 /* number of realms */
3665 total_len += sizeof(u32);
3666 /* version, compat_version and struct_len */
3667 total_len += mdsc->num_snap_realms *
3668 (2 * sizeof(u8) + sizeof(u32));
3669 }
3670 if (total_len > RECONNECT_MAX_SIZE) {
3671 if (!recon_state.allow_multi) {
3672 err = -ENOSPC;
3673 goto fail;
3674 }
3675 if (recon_state.nr_caps) {
3676 err = send_reconnect_partial(&recon_state);
3677 if (err)
3678 goto fail;
3679 }
3680 recon_state.msg_version = 5;
3681 }
2f2dc053 3682 }
2f2dc053 3683
81c5a148
YZ		 3684 err = encode_snap_realms(mdsc, &recon_state);
3685 if (err < 0)
3686 goto fail;
3687
3688 if (recon_state.msg_version >= 5) {
3689 err = ceph_pagelist_encode_8(recon_state.pagelist, 0);
3690 if (err < 0)
3691 goto fail;
3692 }
44c99757 3693
81c5a148
YZ		 3694 if (recon_state.nr_caps || recon_state.nr_realms) {
3695 struct page *page =
3696 list_first_entry(&recon_state.pagelist->head,
3697 struct page, lru);
44c99757 3698 __le32 *addr = kmap_atomic(page);
81c5a148
YZ		 3699 if (recon_state.nr_caps) {
3700 WARN_ON(recon_state.nr_realms != mdsc->num_snap_realms);
3701 *addr = cpu_to_le32(recon_state.nr_caps);
3702 } else if (recon_state.msg_version >= 4) {
3703 *(addr + 1) = cpu_to_le32(recon_state.nr_realms);
3704 }
44c99757 3705 kunmap_atomic(addr);
ebf18f47 3706 }
44c99757 3707
81c5a148
YZ		 3708 reply->hdr.version = cpu_to_le16(recon_state.msg_version);
3709 if (recon_state.msg_version >= 4)
3710 reply->hdr.compat_version = cpu_to_le16(4);
e548e9b9 3711
81c5a148
YZ		 3712 reply->hdr.data_len = cpu_to_le32(recon_state.pagelist->length);
3713 ceph_msg_data_add_pagelist(reply, recon_state.pagelist);
e548e9b9 3714
2f2dc053
SW		 3715 ceph_con_send(&session->s_con, reply);
3716
9abf82b8
SW		 3717 mutex_unlock(&session->s_mutex);
3718
3719 mutex_lock(&mdsc->mutex);
3720 __wake_requests(mdsc, &session->s_waiting);
3721 mutex_unlock(&mdsc->mutex);
3722
2f2dc053 3723 up_read(&mdsc->snap_rwsem);
81c5a148 3724 ceph_pagelist_release(recon_state.pagelist);
2f2dc053
SW		 3725 return;
3726
93cea5be 3727fail:
2f2dc053 3728 ceph_msg_put(reply);
9abf82b8
SW		 3729 up_read(&mdsc->snap_rwsem);
3730 mutex_unlock(&session->s_mutex);
93cea5be 3731fail_nomsg:
81c5a148 3732 ceph_pagelist_release(recon_state.pagelist);
93cea5be 3733fail_nopagelist:
9abf82b8 3734 pr_err("error %d preparing reconnect for mds%d\n", err, mds);
9abf82b8 3735 return;
2f2dc053
SW		 3736}
3737
3738
3739/*
3740 * compare old and new mdsmaps, kicking requests
3741 * and closing out old connections as necessary
3742 *
3743 * called under mdsc->mutex.
3744 */
3745static void check_new_map(struct ceph_mds_client *mdsc,
3746 struct ceph_mdsmap *newmap,
3747 struct ceph_mdsmap *oldmap)
3748{
3749 int i;
3750 int oldstate, newstate;
3751 struct ceph_mds_session *s;
3752
3753 dout("check_new_map new %u old %u\n",
3754 newmap->m_epoch, oldmap->m_epoch);
3755
76201b63 3756 for (i = 0; i < oldmap->m_num_mds && i < mdsc->max_sessions; i++) {
d37b1d99 3757 if (!mdsc->sessions[i])
2f2dc053
SW		 3758 continue;
3759 s = mdsc->sessions[i];
3760 oldstate = ceph_mdsmap_get_state(oldmap, i);
3761 newstate = ceph_mdsmap_get_state(newmap, i);
3762
0deb01c9 3763 dout("check_new_map mds%d state %s%s -> %s%s (session %s)\n",
2f2dc053 3764 i, ceph_mds_state_name(oldstate),
0deb01c9 3765 ceph_mdsmap_is_laggy(oldmap, i) ? " (laggy)" : "",
2f2dc053 3766 ceph_mds_state_name(newstate),
0deb01c9 3767 ceph_mdsmap_is_laggy(newmap, i) ? " (laggy)" : "",
a687ecaf 3768 ceph_session_state_name(s->s_state));
2f2dc053 3769
6f0f597b
YZ		 3770 if (i >= newmap->m_num_mds) {
3771 /* force close session for stopped mds */
3772 get_session(s);
3773 __unregister_session(mdsc, s);
3774 __wake_requests(mdsc, &s->s_waiting);
3775 mutex_unlock(&mdsc->mutex);
2827528d 3776
6f0f597b
YZ		 3777 mutex_lock(&s->s_mutex);
3778 cleanup_session_requests(mdsc, s);
3779 remove_session_caps(s);
3780 mutex_unlock(&s->s_mutex);
2827528d 3781
6f0f597b 3782 ceph_put_mds_session(s);
2827528d 3783
6f0f597b
YZ		 3784 mutex_lock(&mdsc->mutex);
3785 kick_requests(mdsc, i);
3786 continue;
3787 }
3788
3789 if (memcmp(ceph_mdsmap_get_addr(oldmap, i),
3790 ceph_mdsmap_get_addr(newmap, i),
3791 sizeof(struct ceph_entity_addr))) {
3792 /* just close it */
3793 mutex_unlock(&mdsc->mutex);
3794 mutex_lock(&s->s_mutex);
3795 mutex_lock(&mdsc->mutex);
3796 ceph_con_close(&s->s_con);
3797 mutex_unlock(&s->s_mutex);
3798 s->s_state = CEPH_MDS_SESSION_RESTARTING;
2f2dc053
SW		 3799 } else if (oldstate == newstate) {
3800 continue; /* nothing new with this mds */
3801 }
3802
3803 /*
3804 * send reconnect?
3805 */
3806 if (s->s_state == CEPH_MDS_SESSION_RESTARTING &&
34b6c855
SW		 3807 newstate >= CEPH_MDS_STATE_RECONNECT) {
3808 mutex_unlock(&mdsc->mutex);
3809 send_mds_reconnect(mdsc, s);
3810 mutex_lock(&mdsc->mutex);
3811 }
2f2dc053
SW		 3812
3813 /*
29790f26 3814 * kick request on any mds that has gone active.
2f2dc053
SW		 3815 */
3816 if (oldstate < CEPH_MDS_STATE_ACTIVE &&
3817 newstate >= CEPH_MDS_STATE_ACTIVE) {
29790f26
SW		 3818 if (oldstate != CEPH_MDS_STATE_CREATING &&
3819 oldstate != CEPH_MDS_STATE_STARTING)
3820 pr_info("mds%d recovery completed\n", s->s_mds);
3821 kick_requests(mdsc, i);
2f2dc053 3822 ceph_kick_flushing_caps(mdsc, s);
d2f8bb27 3823 wake_up_session_caps(s, RECONNECT);
2f2dc053
SW		 3824 }
3825 }
cb170a22 3826
76201b63 3827 for (i = 0; i < newmap->m_num_mds && i < mdsc->max_sessions; i++) {
cb170a22
SW		 3828 s = mdsc->sessions[i];
3829 if (!s)
3830 continue;
3831 if (!ceph_mdsmap_is_laggy(newmap, i))
3832 continue;
3833 if (s->s_state == CEPH_MDS_SESSION_OPEN ||
3834 s->s_state == CEPH_MDS_SESSION_HUNG ||
3835 s->s_state == CEPH_MDS_SESSION_CLOSING) {
3836 dout(" connecting to export targets of laggy mds%d\n",
3837 i);
3838 __open_export_target_sessions(mdsc, s);
3839 }
3840 }
2f2dc053
SW		 3841}
3842
3843
3844
3845/*
3846 * leases
3847 */
3848
3849/*
3850 * caller must hold session s_mutex, dentry->d_lock
3851 */
3852void __ceph_mdsc_drop_dentry_lease(struct dentry *dentry)
3853{
3854 struct ceph_dentry_info *di = ceph_dentry(dentry);
3855
3856 ceph_put_mds_session(di->lease_session);
3857 di->lease_session = NULL;
3858}
3859
2600d2dd
SW		 3860static void handle_lease(struct ceph_mds_client *mdsc,
3861 struct ceph_mds_session *session,
3862 struct ceph_msg *msg)
2f2dc053 3863{
3d14c5d2 3864 struct super_block *sb = mdsc->fsc->sb;
2f2dc053 3865 struct inode *inode;
2f2dc053
SW		 3866 struct dentry *parent, *dentry;
3867 struct ceph_dentry_info *di;
2600d2dd 3868 int mds = session->s_mds;
2f2dc053 3869 struct ceph_mds_lease *h = msg->front.iov_base;
1e5ea23d 3870 u32 seq;
2f2dc053 3871 struct ceph_vino vino;
2f2dc053
SW		 3872 struct qstr dname;
3873 int release = 0;
3874
2f2dc053
SW		 3875 dout("handle_lease from mds%d\n", mds);
3876
3877 /* decode */
3878 if (msg->front.iov_len < sizeof(*h) + sizeof(u32))
3879 goto bad;
3880 vino.ino = le64_to_cpu(h->ino);
3881 vino.snap = CEPH_NOSNAP;
1e5ea23d 3882 seq = le32_to_cpu(h->seq);
0fcf6c02
YZ		 3883 dname.len = get_unaligned_le32(h + 1);
3884 if (msg->front.iov_len < sizeof(*h) + sizeof(u32) + dname.len)
2f2dc053 3885 goto bad;
0fcf6c02 3886 dname.name = (void *)(h + 1) + sizeof(u32);
2f2dc053 3887
2f2dc053
SW		 3888 /* lookup inode */
3889 inode = ceph_find_inode(sb, vino);
2f90b852
SW		 3890 dout("handle_lease %s, ino %llx %p %.*s\n",
3891 ceph_lease_op_name(h->action), vino.ino, inode,
1e5ea23d 3892 dname.len, dname.name);
6cd3bcad
YZ		 3893
3894 mutex_lock(&session->s_mutex);
3895 session->s_seq++;
3896
d37b1d99 3897 if (!inode) {
2f2dc053
SW		 3898 dout("handle_lease no inode %llx\n", vino.ino);
3899 goto release;
3900 }
2f2dc053
SW		 3901
3902 /* dentry */
3903 parent = d_find_alias(inode);
3904 if (!parent) {
3905 dout("no parent dentry on inode %p\n", inode);
3906 WARN_ON(1);
3907 goto release; /* hrm... */
3908 }
8387ff25 3909 dname.hash = full_name_hash(parent, dname.name, dname.len);
2f2dc053
SW		 3910 dentry = d_lookup(parent, &dname);
3911 dput(parent);
3912 if (!dentry)
3913 goto release;
3914
3915 spin_lock(&dentry->d_lock);
3916 di = ceph_dentry(dentry);
3917 switch (h->action) {
3918 case CEPH_MDS_LEASE_REVOKE:
3d8eb7a9 3919 if (di->lease_session == session) {
1e5ea23d
SW		 3920 if (ceph_seq_cmp(di->lease_seq, seq) > 0)
3921 h->seq = cpu_to_le32(di->lease_seq);
2f2dc053
SW		 3922 __ceph_mdsc_drop_dentry_lease(dentry);
3923 }
3924 release = 1;
3925 break;
3926
3927 case CEPH_MDS_LEASE_RENEW:
3d8eb7a9 3928 if (di->lease_session == session &&
2f2dc053
SW		 3929 di->lease_gen == session->s_cap_gen &&
3930 di->lease_renew_from &&
3931 di->lease_renew_after == 0) {
3932 unsigned long duration =
3563dbdd 3933 msecs_to_jiffies(le32_to_cpu(h->duration_ms));
2f2dc053 3934
1e5ea23d 3935 di->lease_seq = seq;
9b16f03c 3936 di->time = di->lease_renew_from + duration;
2f2dc053
SW		 3937 di->lease_renew_after = di->lease_renew_from +
3938 (duration >> 1);
3939 di->lease_renew_from = 0;
3940 }
3941 break;
3942 }
3943 spin_unlock(&dentry->d_lock);
3944 dput(dentry);
3945
3946 if (!release)
3947 goto out;
3948
3949release:
3950 /* let's just reuse the same message */
3951 h->action = CEPH_MDS_LEASE_REVOKE_ACK;
3952 ceph_msg_get(msg);
3953 ceph_con_send(&session->s_con, msg);
3954
3955out:
2f2dc053 3956 mutex_unlock(&session->s_mutex);
3e1d0452
YZ		 3957 /* avoid calling iput_final() in mds dispatch threads */
3958 ceph_async_iput(inode);
2f2dc053
SW		 3959 return;
3960
3961bad:
3962 pr_err("corrupt lease message\n");
9ec7cab1 3963 ceph_msg_dump(msg);
2f2dc053
SW		 3964}
3965
3966void ceph_mdsc_lease_send_msg(struct ceph_mds_session *session,
2f2dc053
SW		 3967 struct dentry *dentry, char action,
3968 u32 seq)
3969{
3970 struct ceph_msg *msg;
3971 struct ceph_mds_lease *lease;
8f2a98ef
YZ		 3972 struct inode *dir;
3973 int len = sizeof(*lease) + sizeof(u32) + NAME_MAX;
2f2dc053 3974
8f2a98ef
YZ		 3975 dout("lease_send_msg identry %p %s to mds%d\n",
3976 dentry, ceph_lease_op_name(action), session->s_mds);
2f2dc053 3977
b61c2763 3978 msg = ceph_msg_new(CEPH_MSG_CLIENT_LEASE, len, GFP_NOFS, false);
a79832f2 3979 if (!msg)
2f2dc053
SW		 3980 return;
3981 lease = msg->front.iov_base;
3982 lease->action = action;
2f2dc053 3983 lease->seq = cpu_to_le32(seq);
2f2dc053 3984
8f2a98ef
YZ		 3985 spin_lock(&dentry->d_lock);
3986 dir = d_inode(dentry->d_parent);
3987 lease->ino = cpu_to_le64(ceph_ino(dir));
3988 lease->first = lease->last = cpu_to_le64(ceph_snap(dir));
3989
3990 put_unaligned_le32(dentry->d_name.len, lease + 1);
3991 memcpy((void *)(lease + 1) + 4,
3992 dentry->d_name.name, dentry->d_name.len);
3993 spin_unlock(&dentry->d_lock);
2f2dc053
SW		 3994 /*
3995 * if this is a preemptive lease RELEASE, no need to
3996 * flush request stream, since the actual request will
3997 * soon follow.
3998 */
3999 msg->more_to_follow = (action == CEPH_MDS_LEASE_RELEASE);
4000
4001 ceph_con_send(&session->s_con, msg);
4002}
4003
2f2dc053 4004/*
7aac453a 4005 * lock unlock sessions, to wait ongoing session activities
2f2dc053 4006 */
7aac453a 4007static void lock_unlock_sessions(struct ceph_mds_client *mdsc)
2f2dc053
SW		 4008{
4009 int i;
4010
2f2dc053
SW		 4011 mutex_lock(&mdsc->mutex);
4012 for (i = 0; i < mdsc->max_sessions; i++) {
4013 struct ceph_mds_session *s = __ceph_lookup_mds_session(mdsc, i);
4014 if (!s)
4015 continue;
4016 mutex_unlock(&mdsc->mutex);
4017 mutex_lock(&s->s_mutex);
4018 mutex_unlock(&s->s_mutex);
4019 ceph_put_mds_session(s);
4020 mutex_lock(&mdsc->mutex);
4021 }
4022 mutex_unlock(&mdsc->mutex);
4023}
4024
131d7eb4
YZ		 4025static void maybe_recover_session(struct ceph_mds_client *mdsc)
4026{
4027 struct ceph_fs_client *fsc = mdsc->fsc;
4028
4029 if (!ceph_test_mount_opt(fsc, CLEANRECOVER))
4030 return;
2f2dc053 4031
131d7eb4
YZ		 4032 if (READ_ONCE(fsc->mount_state) != CEPH_MOUNT_MOUNTED)
4033 return;
4034
4035 if (!READ_ONCE(fsc->blacklisted))
4036 return;
4037
4038 if (fsc->last_auto_reconnect &&
4039 time_before(jiffies, fsc->last_auto_reconnect + HZ * 60 * 30))
4040 return;
4041
4042 pr_info("auto reconnect after blacklisted\n");
4043 fsc->last_auto_reconnect = jiffies;
4044 ceph_force_reconnect(fsc->sb);
4045}
2f2dc053
SW		 4046
4047/*
4048 * delayed work -- periodically trim expired leases, renew caps with mds
4049 */
4050static void schedule_delayed(struct ceph_mds_client *mdsc)
4051{
4052 int delay = 5;
4053 unsigned hz = round_jiffies_relative(HZ * delay);
4054 schedule_delayed_work(&mdsc->delayed_work, hz);
4055}
4056
4057static void delayed_work(struct work_struct *work)
4058{
4059 int i;
4060 struct ceph_mds_client *mdsc =
4061 container_of(work, struct ceph_mds_client, delayed_work.work);
4062 int renew_interval;
4063 int renew_caps;
4064
4065 dout("mdsc delayed_work\n");
75c9627e 4066
2f2dc053
SW		 4067 mutex_lock(&mdsc->mutex);
4068 renew_interval = mdsc->mdsmap->m_session_timeout >> 2;
4069 renew_caps = time_after_eq(jiffies, HZ*renew_interval +
4070 mdsc->last_renew_caps);
4071 if (renew_caps)
4072 mdsc->last_renew_caps = jiffies;
4073
4074 for (i = 0; i < mdsc->max_sessions; i++) {
4075 struct ceph_mds_session *s = __ceph_lookup_mds_session(mdsc, i);
d37b1d99 4076 if (!s)
2f2dc053
SW		 4077 continue;
4078 if (s->s_state == CEPH_MDS_SESSION_CLOSING) {
4079 dout("resending session close request for mds%d\n",
4080 s->s_mds);
4081 request_close_session(mdsc, s);
4082 ceph_put_mds_session(s);
4083 continue;
4084 }
4085 if (s->s_ttl && time_after(jiffies, s->s_ttl)) {
4086 if (s->s_state == CEPH_MDS_SESSION_OPEN) {
4087 s->s_state = CEPH_MDS_SESSION_HUNG;
4088 pr_info("mds%d hung\n", s->s_mds);
4089 }
4090 }
71a228bc
EC		 4091 if (s->s_state == CEPH_MDS_SESSION_NEW ||
4092 s->s_state == CEPH_MDS_SESSION_RESTARTING ||
4093 s->s_state == CEPH_MDS_SESSION_REJECTED) {
2f2dc053
SW		 4094 /* this mds is failed or recovering, just wait */
4095 ceph_put_mds_session(s);
4096 continue;
4097 }
4098 mutex_unlock(&mdsc->mutex);
4099
4100 mutex_lock(&s->s_mutex);
4101 if (renew_caps)
4102 send_renew_caps(mdsc, s);
4103 else
4104 ceph_con_keepalive(&s->s_con);
aab53dd9
SW		 4105 if (s->s_state == CEPH_MDS_SESSION_OPEN ||
4106 s->s_state == CEPH_MDS_SESSION_HUNG)
3d7ded4d 4107 ceph_send_cap_releases(mdsc, s);
2f2dc053
SW		 4108 mutex_unlock(&s->s_mutex);
4109 ceph_put_mds_session(s);
4110
4111 mutex_lock(&mdsc->mutex);
4112 }
4113 mutex_unlock(&mdsc->mutex);
4114
37c4efc1
YZ		 4115 ceph_check_delayed_caps(mdsc);
4116
4117 ceph_queue_cap_reclaim_work(mdsc);
4118
4119 ceph_trim_snapid_map(mdsc);
4120
131d7eb4
YZ		 4121 maybe_recover_session(mdsc);
4122
2f2dc053
SW		 4123 schedule_delayed(mdsc);
4124}
4125
3d14c5d2 4126int ceph_mdsc_init(struct ceph_fs_client *fsc)
2f2dc053 4127
2f2dc053 4128{
3d14c5d2
YS		 4129 struct ceph_mds_client *mdsc;
4130
4131 mdsc = kzalloc(sizeof(struct ceph_mds_client), GFP_NOFS);
4132 if (!mdsc)
4133 return -ENOMEM;
4134 mdsc->fsc = fsc;
2f2dc053
SW		 4135 mutex_init(&mdsc->mutex);
4136 mdsc->mdsmap = kzalloc(sizeof(*mdsc->mdsmap), GFP_NOFS);
d37b1d99 4137 if (!mdsc->mdsmap) {
fb3101b6 4138 kfree(mdsc);
2d06eeb8 4139 return -ENOMEM;
fb3101b6 4140 }
2d06eeb8 4141
50c55aec 4142 fsc->mdsc = mdsc;
2f2dc053 4143 init_completion(&mdsc->safe_umount_waiters);
f3c60c59 4144 init_waitqueue_head(&mdsc->session_close_wq);
2f2dc053
SW		 4145 INIT_LIST_HEAD(&mdsc->waiting_for_map);
4146 mdsc->sessions = NULL;
86d8f67b 4147 atomic_set(&mdsc->num_sessions, 0);
2f2dc053
SW		 4148 mdsc->max_sessions = 0;
4149 mdsc->stopping = 0;
d557c48d 4150 atomic64_set(&mdsc->quotarealms_count, 0);
0c44a8e0
LH		 4151 mdsc->quotarealms_inodes = RB_ROOT;
4152 mutex_init(&mdsc->quotarealms_inodes_mutex);
affbc19a 4153 mdsc->last_snap_seq = 0;
2f2dc053 4154 init_rwsem(&mdsc->snap_rwsem);
a105f00c 4155 mdsc->snap_realms = RB_ROOT;
2f2dc053 4156 INIT_LIST_HEAD(&mdsc->snap_empty);
81c5a148 4157 mdsc->num_snap_realms = 0;
2f2dc053
SW		 4158 spin_lock_init(&mdsc->snap_empty_lock);
4159 mdsc->last_tid = 0;
e8a7b8b1 4160 mdsc->oldest_tid = 0;
44ca18f2 4161 mdsc->request_tree = RB_ROOT;
2f2dc053
SW		 4162 INIT_DELAYED_WORK(&mdsc->delayed_work, delayed_work);
4163 mdsc->last_renew_caps = jiffies;
4164 INIT_LIST_HEAD(&mdsc->cap_delay_list);
4165 spin_lock_init(&mdsc->cap_delay_lock);
4166 INIT_LIST_HEAD(&mdsc->snap_flush_list);
4167 spin_lock_init(&mdsc->snap_flush_lock);
553adfd9 4168 mdsc->last_cap_flush_tid = 1;
e4500b5e 4169 INIT_LIST_HEAD(&mdsc->cap_flush_list);
2f2dc053 4170 INIT_LIST_HEAD(&mdsc->cap_dirty);
db354052 4171 INIT_LIST_HEAD(&mdsc->cap_dirty_migrating);
2f2dc053
SW		 4172 mdsc->num_cap_flushing = 0;
4173 spin_lock_init(&mdsc->cap_dirty_lock);
4174 init_waitqueue_head(&mdsc->cap_flushing_wq);
37c4efc1 4175 INIT_WORK(&mdsc->cap_reclaim_work, ceph_cap_reclaim_work);
fe33032d 4176 atomic_set(&mdsc->cap_reclaim_pending, 0);
37c4efc1
YZ		 4177
4178 spin_lock_init(&mdsc->dentry_list_lock);
4179 INIT_LIST_HEAD(&mdsc->dentry_leases);
4180 INIT_LIST_HEAD(&mdsc->dentry_dir_leases);
2d06eeb8 4181
37151668 4182 ceph_caps_init(mdsc);
fe33032d 4183 ceph_adjust_caps_max_min(mdsc, fsc->mount_options);
37151668 4184
75c9627e
YZ		 4185 spin_lock_init(&mdsc->snapid_map_lock);
4186 mdsc->snapid_map_tree = RB_ROOT;
4187 INIT_LIST_HEAD(&mdsc->snapid_map_lru);
4188
10183a69
YZ		 4189 init_rwsem(&mdsc->pool_perm_rwsem);
4190 mdsc->pool_perm_tree = RB_ROOT;
4191
dfeb84d4
YZ		 4192 strscpy(mdsc->nodename, utsname()->nodename,
4193 sizeof(mdsc->nodename));
5f44f142 4194 return 0;
2f2dc053
SW		 4195}
4196
4197/*
4198 * Wait for safe replies on open mds requests. If we time out, drop
4199 * all requests from the tree to avoid dangling dentry refs.
4200 */
4201static void wait_requests(struct ceph_mds_client *mdsc)
4202{
a319bf56 4203 struct ceph_options *opts = mdsc->fsc->client->options;
2f2dc053 4204 struct ceph_mds_request *req;
2f2dc053
SW		 4205
4206 mutex_lock(&mdsc->mutex);
44ca18f2 4207 if (__get_oldest_req(mdsc)) {
2f2dc053 4208 mutex_unlock(&mdsc->mutex);
44ca18f2 4209
2f2dc053
SW		 4210 dout("wait_requests waiting for requests\n");
4211 wait_for_completion_timeout(&mdsc->safe_umount_waiters,
a319bf56 4212 ceph_timeout_jiffies(opts->mount_timeout));
2f2dc053
SW		 4213
4214 /* tear down remaining requests */
44ca18f2
SW		 4215 mutex_lock(&mdsc->mutex);
4216 while ((req = __get_oldest_req(mdsc))) {
2f2dc053
SW		 4217 dout("wait_requests timed out on tid %llu\n",
4218 req->r_tid);
428138c9 4219 list_del_init(&req->r_wait);
44ca18f2 4220 __unregister_request(mdsc, req);
2f2dc053
SW		 4221 }
4222 }
4223 mutex_unlock(&mdsc->mutex);
4224 dout("wait_requests done\n");
4225}
4226
4227/*
4228 * called before mount is ro, and before dentries are torn down.
4229 * (hmm, does this still race with new lookups?)
4230 */
4231void ceph_mdsc_pre_umount(struct ceph_mds_client *mdsc)
4232{
4233 dout("pre_umount\n");
4234 mdsc->stopping = 1;
4235
7aac453a 4236 lock_unlock_sessions(mdsc);
afcdaea3 4237 ceph_flush_dirty_caps(mdsc);
2f2dc053 4238 wait_requests(mdsc);
17c688c3
SW		 4239
4240 /*
4241 * wait for reply handlers to drop their request refs and
4242 * their inode/dcache refs
4243 */
4244 ceph_msgr_flush();
0c44a8e0
LH		 4245
4246 ceph_cleanup_quotarealms_inodes(mdsc);
2f2dc053
SW		 4247}
4248
4249/*
4250 * wait for all write mds requests to flush.
4251 */
4252static void wait_unsafe_requests(struct ceph_mds_client *mdsc, u64 want_tid)
4253{
80fc7314 4254 struct ceph_mds_request *req = NULL, *nextreq;
44ca18f2 4255 struct rb_node *n;
2f2dc053
SW		 4256
4257 mutex_lock(&mdsc->mutex);
4258 dout("wait_unsafe_requests want %lld\n", want_tid);
80fc7314 4259restart:
44ca18f2
SW		 4260 req = __get_oldest_req(mdsc);
4261 while (req && req->r_tid <= want_tid) {
80fc7314
SW		 4262 /* find next request */
4263 n = rb_next(&req->r_node);
4264 if (n)
4265 nextreq = rb_entry(n, struct ceph_mds_request, r_node);
4266 else
4267 nextreq = NULL;
e8a7b8b1
YZ		 4268 if (req->r_op != CEPH_MDS_OP_SETFILELOCK &&
4269 (req->r_op & CEPH_MDS_OP_WRITE)) {
44ca18f2
SW		 4270 /* write op */
4271 ceph_mdsc_get_request(req);
80fc7314
SW		 4272 if (nextreq)
4273 ceph_mdsc_get_request(nextreq);
44ca18f2
SW		 4274 mutex_unlock(&mdsc->mutex);
4275 dout("wait_unsafe_requests wait on %llu (want %llu)\n",
4276 req->r_tid, want_tid);
4277 wait_for_completion(&req->r_safe_completion);
4278 mutex_lock(&mdsc->mutex);
44ca18f2 4279 ceph_mdsc_put_request(req);
80fc7314
SW		 4280 if (!nextreq)
4281 break; /* next dne before, so we're done! */
4282 if (RB_EMPTY_NODE(&nextreq->r_node)) {
4283 /* next request was removed from tree */
4284 ceph_mdsc_put_request(nextreq);
4285 goto restart;
4286 }
4287 ceph_mdsc_put_request(nextreq); /* won't go away */
44ca18f2 4288 }
80fc7314 4289 req = nextreq;
2f2dc053
SW		 4290 }
4291 mutex_unlock(&mdsc->mutex);
4292 dout("wait_unsafe_requests done\n");
4293}
4294
4295void ceph_mdsc_sync(struct ceph_mds_client *mdsc)
4296{
0e294387 4297 u64 want_tid, want_flush;
2f2dc053 4298
52953d55 4299 if (READ_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_SHUTDOWN)
56b7cf95
SW		 4300 return;
4301
2f2dc053
SW		 4302 dout("sync\n");
4303 mutex_lock(&mdsc->mutex);
4304 want_tid = mdsc->last_tid;
2f2dc053 4305 mutex_unlock(&mdsc->mutex);
2f2dc053 4306
afcdaea3 4307 ceph_flush_dirty_caps(mdsc);
d3383a8e 4308 spin_lock(&mdsc->cap_dirty_lock);
8310b089 4309 want_flush = mdsc->last_cap_flush_tid;
c8799fc4
YZ		 4310 if (!list_empty(&mdsc->cap_flush_list)) {
4311 struct ceph_cap_flush *cf =
4312 list_last_entry(&mdsc->cap_flush_list,
4313 struct ceph_cap_flush, g_list);
4314 cf->wake = true;
4315 }
d3383a8e
YZ		 4316 spin_unlock(&mdsc->cap_dirty_lock);
4317
0e294387
YZ		 4318 dout("sync want tid %lld flush_seq %lld\n",
4319 want_tid, want_flush);
2f2dc053
SW		 4320
4321 wait_unsafe_requests(mdsc, want_tid);
0e294387 4322 wait_caps_flush(mdsc, want_flush);
2f2dc053
SW		 4323}
4324
f3c60c59
SW		 4325/*
4326 * true if all sessions are closed, or we force unmount
4327 */
fcff415c 4328static bool done_closing_sessions(struct ceph_mds_client *mdsc, int skipped)
f3c60c59 4329{
52953d55 4330 if (READ_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_SHUTDOWN)
f3c60c59 4331 return true;
fcff415c 4332 return atomic_read(&mdsc->num_sessions) <= skipped;
f3c60c59 4333}
2f2dc053
SW		 4334
4335/*
4336 * called after sb is ro.
4337 */
4338void ceph_mdsc_close_sessions(struct ceph_mds_client *mdsc)
4339{
a319bf56 4340 struct ceph_options *opts = mdsc->fsc->client->options;
2f2dc053
SW		 4341 struct ceph_mds_session *session;
4342 int i;
fcff415c 4343 int skipped = 0;
2f2dc053
SW		 4344
4345 dout("close_sessions\n");
4346
2f2dc053 4347 /* close sessions */
f3c60c59
SW		 4348 mutex_lock(&mdsc->mutex);
4349 for (i = 0; i < mdsc->max_sessions; i++) {
4350 session = __ceph_lookup_mds_session(mdsc, i);
4351 if (!session)
4352 continue;
2f2dc053 4353 mutex_unlock(&mdsc->mutex);
f3c60c59 4354 mutex_lock(&session->s_mutex);
fcff415c
YZ		 4355 if (__close_session(mdsc, session) <= 0)
4356 skipped++;
f3c60c59
SW		 4357 mutex_unlock(&session->s_mutex);
4358 ceph_put_mds_session(session);
2f2dc053
SW		 4359 mutex_lock(&mdsc->mutex);
4360 }
f3c60c59
SW		 4361 mutex_unlock(&mdsc->mutex);
4362
4363 dout("waiting for sessions to close\n");
fcff415c
YZ		 4364 wait_event_timeout(mdsc->session_close_wq,
4365 done_closing_sessions(mdsc, skipped),
a319bf56 4366 ceph_timeout_jiffies(opts->mount_timeout));
2f2dc053
SW		 4367
4368 /* tear down remaining sessions */
f3c60c59 4369 mutex_lock(&mdsc->mutex);
2f2dc053
SW		 4370 for (i = 0; i < mdsc->max_sessions; i++) {
4371 if (mdsc->sessions[i]) {
4372 session = get_session(mdsc->sessions[i]);
2600d2dd 4373 __unregister_session(mdsc, session);
2f2dc053
SW		 4374 mutex_unlock(&mdsc->mutex);
4375 mutex_lock(&session->s_mutex);
4376 remove_session_caps(session);
4377 mutex_unlock(&session->s_mutex);
4378 ceph_put_mds_session(session);
4379 mutex_lock(&mdsc->mutex);
4380 }
4381 }
2f2dc053 4382 WARN_ON(!list_empty(&mdsc->cap_delay_list));
2f2dc053
SW		 4383 mutex_unlock(&mdsc->mutex);
4384
75c9627e 4385 ceph_cleanup_snapid_map(mdsc);
2f2dc053
SW		 4386 ceph_cleanup_empty_realms(mdsc);
4387
37c4efc1 4388 cancel_work_sync(&mdsc->cap_reclaim_work);
2f2dc053
SW		 4389 cancel_delayed_work_sync(&mdsc->delayed_work); /* cancel timer */
4390
4391 dout("stopped\n");
4392}
4393
48fec5d0
YZ		 4394void ceph_mdsc_force_umount(struct ceph_mds_client *mdsc)
4395{
4396 struct ceph_mds_session *session;
4397 int mds;
4398
4399 dout("force umount\n");
4400
4401 mutex_lock(&mdsc->mutex);
4402 for (mds = 0; mds < mdsc->max_sessions; mds++) {
4403 session = __ceph_lookup_mds_session(mdsc, mds);
4404 if (!session)
4405 continue;
d468e729
YZ		 4406
4407 if (session->s_state == CEPH_MDS_SESSION_REJECTED)
4408 __unregister_session(mdsc, session);
4409 __wake_requests(mdsc, &session->s_waiting);
48fec5d0 4410 mutex_unlock(&mdsc->mutex);
d468e729 4411
48fec5d0
YZ		 4412 mutex_lock(&session->s_mutex);
4413 __close_session(mdsc, session);
4414 if (session->s_state == CEPH_MDS_SESSION_CLOSING) {
4415 cleanup_session_requests(mdsc, session);
4416 remove_session_caps(session);
4417 }
4418 mutex_unlock(&session->s_mutex);
4419 ceph_put_mds_session(session);
d468e729 4420
48fec5d0
YZ		 4421 mutex_lock(&mdsc->mutex);
4422 kick_requests(mdsc, mds);
4423 }
4424 __wake_requests(mdsc, &mdsc->waiting_for_map);
4425 mutex_unlock(&mdsc->mutex);
4426}
4427
3d14c5d2 4428static void ceph_mdsc_stop(struct ceph_mds_client *mdsc)
2f2dc053
SW		 4429{
4430 dout("stop\n");
4431 cancel_delayed_work_sync(&mdsc->delayed_work); /* cancel timer */
4432 if (mdsc->mdsmap)
4433 ceph_mdsmap_destroy(mdsc->mdsmap);
4434 kfree(mdsc->sessions);
37151668 4435 ceph_caps_finalize(mdsc);
10183a69 4436 ceph_pool_perm_destroy(mdsc);
2f2dc053
SW		 4437}
4438
3d14c5d2
YS		 4439void ceph_mdsc_destroy(struct ceph_fs_client *fsc)
4440{
4441 struct ceph_mds_client *mdsc = fsc->mdsc;
ef550f6f 4442 dout("mdsc_destroy %p\n", mdsc);
ef550f6f 4443
50c55aec
CX		 4444 if (!mdsc)
4445 return;
4446
ef550f6f
SW		 4447 /* flush out any connection work with references to us */
4448 ceph_msgr_flush();
4449
62a65f36
YZ		 4450 ceph_mdsc_stop(mdsc);
4451
3d14c5d2
YS		 4452 fsc->mdsc = NULL;
4453 kfree(mdsc);
ef550f6f 4454 dout("mdsc_destroy %p done\n", mdsc);
3d14c5d2
YS		 4455}
4456
430afbad
YZ		 4457void ceph_mdsc_handle_fsmap(struct ceph_mds_client *mdsc, struct ceph_msg *msg)
4458{
4459 struct ceph_fs_client *fsc = mdsc->fsc;
4460 const char *mds_namespace = fsc->mount_options->mds_namespace;
4461 void *p = msg->front.iov_base;
4462 void *end = p + msg->front.iov_len;
4463 u32 epoch;
4464 u32 map_len;
4465 u32 num_fs;
4466 u32 mount_fscid = (u32)-1;
4467 u8 struct_v, struct_cv;
4468 int err = -EINVAL;
4469
4470 ceph_decode_need(&p, end, sizeof(u32), bad);
4471 epoch = ceph_decode_32(&p);
4472
4473 dout("handle_fsmap epoch %u\n", epoch);
4474
4475 ceph_decode_need(&p, end, 2 + sizeof(u32), bad);
4476 struct_v = ceph_decode_8(&p);
4477 struct_cv = ceph_decode_8(&p);
4478 map_len = ceph_decode_32(&p);
4479
4480 ceph_decode_need(&p, end, sizeof(u32) * 3, bad);
4481 p += sizeof(u32) * 2; /* skip epoch and legacy_client_fscid */
4482
4483 num_fs = ceph_decode_32(&p);
4484 while (num_fs-- > 0) {
4485 void *info_p, *info_end;
4486 u32 info_len;
4487 u8 info_v, info_cv;
4488 u32 fscid, namelen;
4489
4490 ceph_decode_need(&p, end, 2 + sizeof(u32), bad);
4491 info_v = ceph_decode_8(&p);
4492 info_cv = ceph_decode_8(&p);
4493 info_len = ceph_decode_32(&p);
4494 ceph_decode_need(&p, end, info_len, bad);
4495 info_p = p;
4496 info_end = p + info_len;
4497 p = info_end;
4498
4499 ceph_decode_need(&info_p, info_end, sizeof(u32) * 2, bad);
4500 fscid = ceph_decode_32(&info_p);
4501 namelen = ceph_decode_32(&info_p);
4502 ceph_decode_need(&info_p, info_end, namelen, bad);
4503
4504 if (mds_namespace &&
4505 strlen(mds_namespace) == namelen &&
4506 !strncmp(mds_namespace, (char *)info_p, namelen)) {
4507 mount_fscid = fscid;
4508 break;
4509 }
4510 }
4511
4512 ceph_monc_got_map(&fsc->client->monc, CEPH_SUB_FSMAP, epoch);
4513 if (mount_fscid != (u32)-1) {
4514 fsc->client->monc.fs_cluster_id = mount_fscid;
4515 ceph_monc_want_map(&fsc->client->monc, CEPH_SUB_MDSMAP,
4516 0, true);
4517 ceph_monc_renew_subs(&fsc->client->monc);
4518 } else {
4519 err = -ENOENT;
4520 goto err_out;
4521 }
4522 return;
76bd6ec4 4523
430afbad
YZ		 4524bad:
4525 pr_err("error decoding fsmap\n");
4526err_out:
4527 mutex_lock(&mdsc->mutex);
76bd6ec4 4528 mdsc->mdsmap_err = err;
430afbad
YZ		 4529 __wake_requests(mdsc, &mdsc->waiting_for_map);
4530 mutex_unlock(&mdsc->mutex);
430afbad 4531}
2f2dc053
SW		 4532
4533/*
4534 * handle mds map update.
4535 */
430afbad 4536void ceph_mdsc_handle_mdsmap(struct ceph_mds_client *mdsc, struct ceph_msg *msg)
2f2dc053
SW		 4537{
4538 u32 epoch;
4539 u32 maplen;
4540 void *p = msg->front.iov_base;
4541 void *end = p + msg->front.iov_len;
4542 struct ceph_mdsmap *newmap, *oldmap;
4543 struct ceph_fsid fsid;
4544 int err = -EINVAL;
4545
4546 ceph_decode_need(&p, end, sizeof(fsid)+2*sizeof(u32), bad);
4547 ceph_decode_copy(&p, &fsid, sizeof(fsid));
3d14c5d2 4548 if (ceph_check_fsid(mdsc->fsc->client, &fsid) < 0)
0743304d 4549 return;
c89136ea
SW		 4550 epoch = ceph_decode_32(&p);
4551 maplen = ceph_decode_32(&p);
2f2dc053
SW		 4552 dout("handle_map epoch %u len %d\n", epoch, (int)maplen);
4553
4554 /* do we need it? */
2f2dc053
SW		 4555 mutex_lock(&mdsc->mutex);
4556 if (mdsc->mdsmap && epoch <= mdsc->mdsmap->m_epoch) {
4557 dout("handle_map epoch %u <= our %u\n",
4558 epoch, mdsc->mdsmap->m_epoch);
4559 mutex_unlock(&mdsc->mutex);
4560 return;
4561 }
4562
4563 newmap = ceph_mdsmap_decode(&p, end);
4564 if (IS_ERR(newmap)) {
4565 err = PTR_ERR(newmap);
4566 goto bad_unlock;
4567 }
4568
4569 /* swap into place */
4570 if (mdsc->mdsmap) {
4571 oldmap = mdsc->mdsmap;
4572 mdsc->mdsmap = newmap;
4573 check_new_map(mdsc, newmap, oldmap);
4574 ceph_mdsmap_destroy(oldmap);
4575 } else {
4576 mdsc->mdsmap = newmap; /* first mds map */
4577 }
719784ba
CX		 4578 mdsc->fsc->max_file_size = min((loff_t)mdsc->mdsmap->m_max_file_size,
4579 MAX_LFS_FILESIZE);
2f2dc053
SW		 4580
4581 __wake_requests(mdsc, &mdsc->waiting_for_map);
82dcabad
ID		 4582 ceph_monc_got_map(&mdsc->fsc->client->monc, CEPH_SUB_MDSMAP,
4583 mdsc->mdsmap->m_epoch);
2f2dc053
SW		 4584
4585 mutex_unlock(&mdsc->mutex);
4586 schedule_delayed(mdsc);
4587 return;
4588
4589bad_unlock:
4590 mutex_unlock(&mdsc->mutex);
4591bad:
4592 pr_err("error decoding mdsmap %d\n", err);
4593 return;
4594}
4595
4596static struct ceph_connection *con_get(struct ceph_connection *con)
4597{
4598 struct ceph_mds_session *s = con->private;
4599
4600 if (get_session(s)) {
3997c01d 4601 dout("mdsc con_get %p ok (%d)\n", s, refcount_read(&s->s_ref));
2f2dc053
SW		 4602 return con;
4603 }
4604 dout("mdsc con_get %p FAIL\n", s);
4605 return NULL;
4606}
4607
4608static void con_put(struct ceph_connection *con)
4609{
4610 struct ceph_mds_session *s = con->private;
4611
3997c01d 4612 dout("mdsc con_put %p (%d)\n", s, refcount_read(&s->s_ref) - 1);
2f2dc053
SW		 4613 ceph_put_mds_session(s);
4614}
4615
4616/*
4617 * if the client is unresponsive for long enough, the mds will kill
4618 * the session entirely.
4619 */
4620static void peer_reset(struct ceph_connection *con)
4621{
4622 struct ceph_mds_session *s = con->private;
7e70f0ed 4623 struct ceph_mds_client *mdsc = s->s_mdsc;
2f2dc053 4624
f3ae1b97 4625 pr_warn("mds%d closed our session\n", s->s_mds);
7e70f0ed 4626 send_mds_reconnect(mdsc, s);
2f2dc053
SW		 4627}
4628
4629static void dispatch(struct ceph_connection *con, struct ceph_msg *msg)
4630{
4631 struct ceph_mds_session *s = con->private;
4632 struct ceph_mds_client *mdsc = s->s_mdsc;
4633 int type = le16_to_cpu(msg->hdr.type);
4634
2600d2dd
SW		 4635 mutex_lock(&mdsc->mutex);
4636 if (__verify_registered_session(mdsc, s) < 0) {
4637 mutex_unlock(&mdsc->mutex);
4638 goto out;
4639 }
4640 mutex_unlock(&mdsc->mutex);
4641
2f2dc053
SW		 4642 switch (type) {
4643 case CEPH_MSG_MDS_MAP:
430afbad
YZ		 4644 ceph_mdsc_handle_mdsmap(mdsc, msg);
4645 break;
4646 case CEPH_MSG_FS_MAP_USER:
4647 ceph_mdsc_handle_fsmap(mdsc, msg);
2f2dc053
SW		 4648 break;
4649 case CEPH_MSG_CLIENT_SESSION:
4650 handle_session(s, msg);
4651 break;
4652 case CEPH_MSG_CLIENT_REPLY:
4653 handle_reply(s, msg);
4654 break;
4655 case CEPH_MSG_CLIENT_REQUEST_FORWARD:
2600d2dd 4656 handle_forward(mdsc, s, msg);
2f2dc053
SW		 4657 break;
4658 case CEPH_MSG_CLIENT_CAPS:
4659 ceph_handle_caps(s, msg);
4660 break;
4661 case CEPH_MSG_CLIENT_SNAP:
2600d2dd 4662 ceph_handle_snap(mdsc, s, msg);
2f2dc053
SW		 4663 break;
4664 case CEPH_MSG_CLIENT_LEASE:
2600d2dd 4665 handle_lease(mdsc, s, msg);
2f2dc053 4666 break;
fb18a575
LH		 4667 case CEPH_MSG_CLIENT_QUOTA:
4668 ceph_handle_quota(mdsc, s, msg);
4669 break;
2f2dc053
SW		 4670
4671 default:
4672 pr_err("received unknown message type %d %s\n", type,
4673 ceph_msg_type_name(type));
4674 }
2600d2dd 4675out:
2f2dc053
SW		 4676 ceph_msg_put(msg);
4677}
4678
4e7a5dcd
SW		 4679/*
4680 * authentication
4681 */
a3530df3
AE		 4682
4683/*
4684 * Note: returned pointer is the address of a structure that's
4685 * managed separately. Caller must *not* attempt to free it.
4686 */
4687static struct ceph_auth_handshake *get_authorizer(struct ceph_connection *con,
8f43fb53 4688 int *proto, int force_new)
4e7a5dcd
SW		 4689{
4690 struct ceph_mds_session *s = con->private;
4691 struct ceph_mds_client *mdsc = s->s_mdsc;
3d14c5d2 4692 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
74f1869f 4693 struct ceph_auth_handshake *auth = &s->s_auth;
4e7a5dcd 4694
74f1869f 4695 if (force_new && auth->authorizer) {
6c1ea260 4696 ceph_auth_destroy_authorizer(auth->authorizer);
74f1869f 4697 auth->authorizer = NULL;
4e7a5dcd 4698 }
27859f97
SW		 4699 if (!auth->authorizer) {
4700 int ret = ceph_auth_create_authorizer(ac, CEPH_ENTITY_TYPE_MDS,
4701 auth);
0bed9b5c
SW		 4702 if (ret)
4703 return ERR_PTR(ret);
27859f97
SW		 4704 } else {
4705 int ret = ceph_auth_update_authorizer(ac, CEPH_ENTITY_TYPE_MDS,
4706 auth);
a255651d 4707 if (ret)
a3530df3 4708 return ERR_PTR(ret);
4e7a5dcd 4709 }
4e7a5dcd 4710 *proto = ac->protocol;
74f1869f 4711
a3530df3 4712 return auth;
4e7a5dcd
SW		 4713}
4714
6daca13d
ID		 4715static int add_authorizer_challenge(struct ceph_connection *con,
4716 void *challenge_buf, int challenge_buf_len)
4717{
4718 struct ceph_mds_session *s = con->private;
4719 struct ceph_mds_client *mdsc = s->s_mdsc;
4720 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
4721
4722 return ceph_auth_add_authorizer_challenge(ac, s->s_auth.authorizer,
4723 challenge_buf, challenge_buf_len);
4724}
4e7a5dcd 4725
0dde5848 4726static int verify_authorizer_reply(struct ceph_connection *con)
4e7a5dcd
SW		 4727{
4728 struct ceph_mds_session *s = con->private;
4729 struct ceph_mds_client *mdsc = s->s_mdsc;
3d14c5d2 4730 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
4e7a5dcd 4731
0dde5848 4732 return ceph_auth_verify_authorizer_reply(ac, s->s_auth.authorizer);
4e7a5dcd
SW		 4733}
4734
9bd2e6f8
SW		 4735static int invalidate_authorizer(struct ceph_connection *con)
4736{
4737 struct ceph_mds_session *s = con->private;
4738 struct ceph_mds_client *mdsc = s->s_mdsc;
3d14c5d2 4739 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
9bd2e6f8 4740
27859f97 4741 ceph_auth_invalidate_authorizer(ac, CEPH_ENTITY_TYPE_MDS);
9bd2e6f8 4742
3d14c5d2 4743 return ceph_monc_validate_auth(&mdsc->fsc->client->monc);
9bd2e6f8
SW		 4744}
4745
53ded495
AE		 4746static struct ceph_msg *mds_alloc_msg(struct ceph_connection *con,
4747 struct ceph_msg_header *hdr, int *skip)
4748{
4749 struct ceph_msg *msg;
4750 int type = (int) le16_to_cpu(hdr->type);
4751 int front_len = (int) le32_to_cpu(hdr->front_len);
4752
4753 if (con->in_msg)
4754 return con->in_msg;
4755
4756 *skip = 0;
4757 msg = ceph_msg_new(type, front_len, GFP_NOFS, false);
4758 if (!msg) {
4759 pr_err("unable to allocate msg type %d len %d\n",
4760 type, front_len);
4761 return NULL;
4762 }
53ded495
AE		 4763
4764 return msg;
4765}
4766
79dbd1ba 4767static int mds_sign_message(struct ceph_msg *msg)
33d07337 4768{
79dbd1ba 4769 struct ceph_mds_session *s = msg->con->private;
33d07337 4770 struct ceph_auth_handshake *auth = &s->s_auth;
79dbd1ba 4771
33d07337
YZ		 4772 return ceph_auth_sign_message(auth, msg);
4773}
4774
79dbd1ba 4775static int mds_check_message_signature(struct ceph_msg *msg)
33d07337 4776{
79dbd1ba 4777 struct ceph_mds_session *s = msg->con->private;
33d07337 4778 struct ceph_auth_handshake *auth = &s->s_auth;
79dbd1ba 4779
33d07337
YZ		 4780 return ceph_auth_check_message_signature(auth, msg);
4781}
4782
9e32789f 4783static const struct ceph_connection_operations mds_con_ops = {
2f2dc053
SW		 4784 .get = con_get,
4785 .put = con_put,
4786 .dispatch = dispatch,
4e7a5dcd 4787 .get_authorizer = get_authorizer,
6daca13d 4788 .add_authorizer_challenge = add_authorizer_challenge,
4e7a5dcd 4789 .verify_authorizer_reply = verify_authorizer_reply,
9bd2e6f8 4790 .invalidate_authorizer = invalidate_authorizer,
2f2dc053 4791 .peer_reset = peer_reset,
53ded495 4792 .alloc_msg = mds_alloc_msg,
79dbd1ba
ID		 4793 .sign_message = mds_sign_message,
4794 .check_message_signature = mds_check_message_signature,
2f2dc053
SW		 4795};
4796
2f2dc053 4797/* eof */
Linux 6.x block layer and io_uring tree(s)