projects / linux-block.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
[linux-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
SW		 22
23/*
24 * A cluster of MDS (metadata server) daemons is responsible for
25 * managing the file system namespace (the directory hierarchy and
26 * inodes) and for coordinating shared access to storage. Metadata is
27 * partitioning hierarchically across a number of servers, and that
28 * partition varies over time as the cluster adjusts the distribution
29 * in order to balance load.
30 *
31 * The MDS client is primarily responsible to managing synchronous
32 * metadata requests for operations like open, unlink, and so forth.
33 * If there is a MDS failure, we find out about it when we (possibly
34 * request and) receive a new MDS map, and can resubmit affected
35 * requests.
36 *
37 * For the most part, though, we take advantage of a lossless
38 * communications channel to the MDS, and do not need to worry about
39 * timing out or resubmitting requests.
40 *
41 * We maintain a stateful "session" with each MDS we interact with.
42 * Within each session, we sent periodic heartbeat messages to ensure
43 * any capabilities or leases we have been issues remain valid. If
44 * the session times out and goes stale, our leases and capabilities
45 * are no longer valid.
46 */
47
20cb34ae 48struct ceph_reconnect_state {
44c99757 49 int nr_caps;
20cb34ae 50 struct ceph_pagelist *pagelist;
121f22a1 51 unsigned msg_version;
20cb34ae
SW		 52};
53
2f2dc053
SW		 54static void __wake_requests(struct ceph_mds_client *mdsc,
55 struct list_head *head);
56
9e32789f 57static const struct ceph_connection_operations mds_con_ops;
2f2dc053
SW		 58
59
60/*
61 * mds reply parsing
62 */
63
64/*
65 * parse individual inode info
66 */
67static int parse_reply_info_in(void **p, void *end,
14303d20 68 struct ceph_mds_reply_info_in *info,
12b4629a 69 u64 features)
2f2dc053
SW		 70{
71 int err = -EIO;
72
73 info->in = *p;
74 *p += sizeof(struct ceph_mds_reply_inode) +
75 sizeof(*info->in->fragtree.splits) *
76 le32_to_cpu(info->in->fragtree.nsplits);
77
78 ceph_decode_32_safe(p, end, info->symlink_len, bad);
79 ceph_decode_need(p, end, info->symlink_len, bad);
80 info->symlink = *p;
81 *p += info->symlink_len;
82
14303d20
SW		 83 if (features & CEPH_FEATURE_DIRLAYOUTHASH)
84 ceph_decode_copy_safe(p, end, &info->dir_layout,
85 sizeof(info->dir_layout), bad);
86 else
87 memset(&info->dir_layout, 0, sizeof(info->dir_layout));
88
2f2dc053
SW		 89 ceph_decode_32_safe(p, end, info->xattr_len, bad);
90 ceph_decode_need(p, end, info->xattr_len, bad);
91 info->xattr_data = *p;
92 *p += info->xattr_len;
fb01d1f8
YZ		 93
94 if (features & CEPH_FEATURE_MDS_INLINE_DATA) {
95 ceph_decode_64_safe(p, end, info->inline_version, bad);
96 ceph_decode_32_safe(p, end, info->inline_len, bad);
97 ceph_decode_need(p, end, info->inline_len, bad);
98 info->inline_data = *p;
99 *p += info->inline_len;
100 } else
101 info->inline_version = CEPH_INLINE_NONE;
102
779fe0fb
YZ		 103 info->pool_ns_len = 0;
104 info->pool_ns_data = NULL;
5ea5c5e0
YZ		 105 if (features & CEPH_FEATURE_FS_FILE_LAYOUT_V2) {
106 ceph_decode_32_safe(p, end, info->pool_ns_len, bad);
779fe0fb
YZ		 107 if (info->pool_ns_len > 0) {
108 ceph_decode_need(p, end, info->pool_ns_len, bad);
109 info->pool_ns_data = *p;
110 *p += info->pool_ns_len;
111 }
5ea5c5e0
YZ		 112 }
113
2f2dc053
SW		 114 return 0;
115bad:
116 return err;
117}
118
119/*
120 * parse a normal reply, which may contain a (dir+)dentry and/or a
121 * target inode.
122 */
123static int parse_reply_info_trace(void **p, void *end,
14303d20 124 struct ceph_mds_reply_info_parsed *info,
12b4629a 125 u64 features)
2f2dc053
SW		 126{
127 int err;
128
129 if (info->head->is_dentry) {
14303d20 130 err = parse_reply_info_in(p, end, &info->diri, features);
2f2dc053
SW		 131 if (err < 0)
132 goto out_bad;
133
134 if (unlikely(*p + sizeof(*info->dirfrag) > end))
135 goto bad;
136 info->dirfrag = *p;
137 *p += sizeof(*info->dirfrag) +
138 sizeof(u32)*le32_to_cpu(info->dirfrag->ndist);
139 if (unlikely(*p > end))
140 goto bad;
141
142 ceph_decode_32_safe(p, end, info->dname_len, bad);
143 ceph_decode_need(p, end, info->dname_len, bad);
144 info->dname = *p;
145 *p += info->dname_len;
146 info->dlease = *p;
147 *p += sizeof(*info->dlease);
148 }
149
150 if (info->head->is_target) {
14303d20 151 err = parse_reply_info_in(p, end, &info->targeti, features);
2f2dc053
SW		 152 if (err < 0)
153 goto out_bad;
154 }
155
156 if (unlikely(*p != end))
157 goto bad;
158 return 0;
159
160bad:
161 err = -EIO;
162out_bad:
163 pr_err("problem parsing mds trace %d\n", err);
164 return err;
165}
166
167/*
168 * parse readdir results
169 */
170static int parse_reply_info_dir(void **p, void *end,
14303d20 171 struct ceph_mds_reply_info_parsed *info,
12b4629a 172 u64 features)
2f2dc053
SW		 173{
174 u32 num, i = 0;
175 int err;
176
177 info->dir_dir = *p;
178 if (*p + sizeof(*info->dir_dir) > end)
179 goto bad;
180 *p += sizeof(*info->dir_dir) +
181 sizeof(u32)*le32_to_cpu(info->dir_dir->ndist);
182 if (*p > end)
183 goto bad;
184
185 ceph_decode_need(p, end, sizeof(num) + 2, bad);
c89136ea 186 num = ceph_decode_32(p);
956d39d6
YZ		 187 {
188 u16 flags = ceph_decode_16(p);
189 info->dir_end = !!(flags & CEPH_READDIR_FRAG_END);
190 info->dir_complete = !!(flags & CEPH_READDIR_FRAG_COMPLETE);
f3c4ebe6 191 info->hash_order = !!(flags & CEPH_READDIR_HASH_ORDER);
79162547 192 info->offset_hash = !!(flags & CEPH_READDIR_OFFSET_HASH);
956d39d6 193 }
2f2dc053
SW		 194 if (num == 0)
195 goto done;
196
2a5beea3
YZ		 197 BUG_ON(!info->dir_entries);
198 if ((unsigned long)(info->dir_entries + num) >
199 (unsigned long)info->dir_entries + info->dir_buf_size) {
54008399
YZ		 200 pr_err("dir contents are larger than expected\n");
201 WARN_ON(1);
202 goto bad;
203 }
2f2dc053 204
54008399 205 info->dir_nr = num;
2f2dc053 206 while (num) {
2a5beea3 207 struct ceph_mds_reply_dir_entry *rde = info->dir_entries + i;
2f2dc053
SW		 208 /* dentry */
209 ceph_decode_need(p, end, sizeof(u32)*2, bad);
2a5beea3
YZ		 210 rde->name_len = ceph_decode_32(p);
211 ceph_decode_need(p, end, rde->name_len, bad);
212 rde->name = *p;
213 *p += rde->name_len;
214 dout("parsed dir dname '%.*s'\n", rde->name_len, rde->name);
215 rde->lease = *p;
2f2dc053
SW		 216 *p += sizeof(struct ceph_mds_reply_lease);
217
218 /* inode */
2a5beea3 219 err = parse_reply_info_in(p, end, &rde->inode, features);
2f2dc053
SW		 220 if (err < 0)
221 goto out_bad;
8974eebd
YZ		 222 /* ceph_readdir_prepopulate() will update it */
223 rde->offset = 0;
2f2dc053
SW		 224 i++;
225 num--;
226 }
227
228done:
229 if (*p != end)
230 goto bad;
231 return 0;
232
233bad:
234 err = -EIO;
235out_bad:
236 pr_err("problem parsing dir contents %d\n", err);
237 return err;
238}
239
25933abd
HS		 240/*
241 * parse fcntl F_GETLK results
242 */
243static int parse_reply_info_filelock(void **p, void *end,
14303d20 244 struct ceph_mds_reply_info_parsed *info,
12b4629a 245 u64 features)
25933abd
HS		 246{
247 if (*p + sizeof(*info->filelock_reply) > end)
248 goto bad;
249
250 info->filelock_reply = *p;
251 *p += sizeof(*info->filelock_reply);
252
253 if (unlikely(*p != end))
254 goto bad;
255 return 0;
256
257bad:
258 return -EIO;
259}
260
6e8575fa
SL		 261/*
262 * parse create results
263 */
264static int parse_reply_info_create(void **p, void *end,
265 struct ceph_mds_reply_info_parsed *info,
12b4629a 266 u64 features)
6e8575fa
SL		 267{
268 if (features & CEPH_FEATURE_REPLY_CREATE_INODE) {
269 if (*p == end) {
270 info->has_create_ino = false;
271 } else {
272 info->has_create_ino = true;
273 info->ino = ceph_decode_64(p);
274 }
275 }
276
277 if (unlikely(*p != end))
278 goto bad;
279 return 0;
280
281bad:
282 return -EIO;
283}
284
25933abd
HS		 285/*
286 * parse extra results
287 */
288static int parse_reply_info_extra(void **p, void *end,
14303d20 289 struct ceph_mds_reply_info_parsed *info,
12b4629a 290 u64 features)
25933abd 291{
6df8c9d8
JL		 292 u32 op = le32_to_cpu(info->head->op);
293
294 if (op == CEPH_MDS_OP_GETFILELOCK)
14303d20 295 return parse_reply_info_filelock(p, end, info, features);
6df8c9d8 296 else if (op == CEPH_MDS_OP_READDIR || op == CEPH_MDS_OP_LSSNAP)
14303d20 297 return parse_reply_info_dir(p, end, info, features);
6df8c9d8 298 else if (op == CEPH_MDS_OP_CREATE)
6e8575fa
SL		 299 return parse_reply_info_create(p, end, info, features);
300 else
301 return -EIO;
25933abd
HS		 302}
303
2f2dc053
SW		 304/*
305 * parse entire mds reply
306 */
307static int parse_reply_info(struct ceph_msg *msg,
14303d20 308 struct ceph_mds_reply_info_parsed *info,
12b4629a 309 u64 features)
2f2dc053
SW		 310{
311 void *p, *end;
312 u32 len;
313 int err;
314
315 info->head = msg->front.iov_base;
316 p = msg->front.iov_base + sizeof(struct ceph_mds_reply_head);
317 end = p + msg->front.iov_len - sizeof(struct ceph_mds_reply_head);
318
319 /* trace */
320 ceph_decode_32_safe(&p, end, len, bad);
321 if (len > 0) {
32852a81 322 ceph_decode_need(&p, end, len, bad);
14303d20 323 err = parse_reply_info_trace(&p, p+len, info, features);
2f2dc053
SW		 324 if (err < 0)
325 goto out_bad;
326 }
327
25933abd 328 /* extra */
2f2dc053
SW		 329 ceph_decode_32_safe(&p, end, len, bad);
330 if (len > 0) {
32852a81 331 ceph_decode_need(&p, end, len, bad);
14303d20 332 err = parse_reply_info_extra(&p, p+len, info, features);
2f2dc053
SW		 333 if (err < 0)
334 goto out_bad;
335 }
336
337 /* snap blob */
338 ceph_decode_32_safe(&p, end, len, bad);
339 info->snapblob_len = len;
340 info->snapblob = p;
341 p += len;
342
343 if (p != end)
344 goto bad;
345 return 0;
346
347bad:
348 err = -EIO;
349out_bad:
350 pr_err("mds parse_reply err %d\n", err);
351 return err;
352}
353
354static void destroy_reply_info(struct ceph_mds_reply_info_parsed *info)
355{
2a5beea3 356 if (!info->dir_entries)
54008399 357 return;
2a5beea3 358 free_pages((unsigned long)info->dir_entries, get_order(info->dir_buf_size));
2f2dc053
SW		 359}
360
361
362/*
363 * sessions
364 */
a687ecaf 365const char *ceph_session_state_name(int s)
2f2dc053
SW		 366{
367 switch (s) {
368 case CEPH_MDS_SESSION_NEW: return "new";
369 case CEPH_MDS_SESSION_OPENING: return "opening";
370 case CEPH_MDS_SESSION_OPEN: return "open";
371 case CEPH_MDS_SESSION_HUNG: return "hung";
372 case CEPH_MDS_SESSION_CLOSING: return "closing";
44ca18f2 373 case CEPH_MDS_SESSION_RESTARTING: return "restarting";
2f2dc053 374 case CEPH_MDS_SESSION_RECONNECTING: return "reconnecting";
fcff415c 375 case CEPH_MDS_SESSION_REJECTED: return "rejected";
2f2dc053
SW		 376 default: return "???";
377 }
378}
379
380static struct ceph_mds_session *get_session(struct ceph_mds_session *s)
381{
3997c01d 382 if (refcount_inc_not_zero(&s->s_ref)) {
2f2dc053 383 dout("mdsc get_session %p %d -> %d\n", s,
3997c01d 384 refcount_read(&s->s_ref)-1, refcount_read(&s->s_ref));
2f2dc053
SW		 385 return s;
386 } else {
387 dout("mdsc get_session %p 0 -- FAIL", s);
388 return NULL;
389 }
390}
391
392void ceph_put_mds_session(struct ceph_mds_session *s)
393{
394 dout("mdsc put_session %p %d -> %d\n", s,
3997c01d
ER		 395 refcount_read(&s->s_ref), refcount_read(&s->s_ref)-1);
396 if (refcount_dec_and_test(&s->s_ref)) {
6c4a1915 397 if (s->s_auth.authorizer)
6c1ea260 398 ceph_auth_destroy_authorizer(s->s_auth.authorizer);
2f2dc053 399 kfree(s);
4e7a5dcd 400 }
2f2dc053
SW		 401}
402
403/*
404 * called under mdsc->mutex
405 */
406struct ceph_mds_session *__ceph_lookup_mds_session(struct ceph_mds_client *mdsc,
407 int mds)
408{
409 struct ceph_mds_session *session;
410
d37b1d99 411 if (mds >= mdsc->max_sessions || !mdsc->sessions[mds])
2f2dc053
SW		 412 return NULL;
413 session = mdsc->sessions[mds];
414 dout("lookup_mds_session %p %d\n", session,
3997c01d 415 refcount_read(&session->s_ref));
2f2dc053
SW		 416 get_session(session);
417 return session;
418}
419
420static bool __have_session(struct ceph_mds_client *mdsc, int mds)
421{
422 if (mds >= mdsc->max_sessions)
423 return false;
424 return mdsc->sessions[mds];
425}
426
2600d2dd
SW		 427static int __verify_registered_session(struct ceph_mds_client *mdsc,
428 struct ceph_mds_session *s)
429{
430 if (s->s_mds >= mdsc->max_sessions ||
431 mdsc->sessions[s->s_mds] != s)
432 return -ENOENT;
433 return 0;
434}
435
2f2dc053
SW		 436/*
437 * create+register a new session for given mds.
438 * called under mdsc->mutex.
439 */
440static struct ceph_mds_session *register_session(struct ceph_mds_client *mdsc,
441 int mds)
442{
443 struct ceph_mds_session *s;
444
76201b63 445 if (mds >= mdsc->mdsmap->m_num_mds)
c338c07c
NY		 446 return ERR_PTR(-EINVAL);
447
2f2dc053 448 s = kzalloc(sizeof(*s), GFP_NOFS);
4736b009
DC		 449 if (!s)
450 return ERR_PTR(-ENOMEM);
2f2dc053
SW		 451 s->s_mdsc = mdsc;
452 s->s_mds = mds;
453 s->s_state = CEPH_MDS_SESSION_NEW;
454 s->s_ttl = 0;
455 s->s_seq = 0;
456 mutex_init(&s->s_mutex);
457
b7a9e5dd 458 ceph_con_init(&s->s_con, s, &mds_con_ops, &mdsc->fsc->client->msgr);
2f2dc053 459
d8fb02ab 460 spin_lock_init(&s->s_gen_ttl_lock);
2f2dc053 461 s->s_cap_gen = 0;
1ce208a6 462 s->s_cap_ttl = jiffies - 1;
d8fb02ab
AE		 463
464 spin_lock_init(&s->s_cap_lock);
2f2dc053
SW		 465 s->s_renew_requested = 0;
466 s->s_renew_seq = 0;
467 INIT_LIST_HEAD(&s->s_caps);
468 s->s_nr_caps = 0;
5dacf091 469 s->s_trim_caps = 0;
3997c01d 470 refcount_set(&s->s_ref, 1);
2f2dc053
SW		 471 INIT_LIST_HEAD(&s->s_waiting);
472 INIT_LIST_HEAD(&s->s_unsafe);
473 s->s_num_cap_releases = 0;
99a9c273 474 s->s_cap_reconnect = 0;
7c1332b8 475 s->s_cap_iterator = NULL;
2f2dc053 476 INIT_LIST_HEAD(&s->s_cap_releases);
2f2dc053 477 INIT_LIST_HEAD(&s->s_cap_flushing);
2f2dc053
SW		 478
479 dout("register_session mds%d\n", mds);
480 if (mds >= mdsc->max_sessions) {
481 int newmax = 1 << get_count_order(mds+1);
482 struct ceph_mds_session **sa;
483
484 dout("register_session realloc to %d\n", newmax);
485 sa = kcalloc(newmax, sizeof(void *), GFP_NOFS);
d37b1d99 486 if (!sa)
42ce56e5 487 goto fail_realloc;
2f2dc053
SW		 488 if (mdsc->sessions) {
489 memcpy(sa, mdsc->sessions,
490 mdsc->max_sessions * sizeof(void *));
491 kfree(mdsc->sessions);
492 }
493 mdsc->sessions = sa;
494 mdsc->max_sessions = newmax;
495 }
496 mdsc->sessions[mds] = s;
86d8f67b 497 atomic_inc(&mdsc->num_sessions);
3997c01d 498 refcount_inc(&s->s_ref); /* one ref to sessions[], one to caller */
42ce56e5 499
b7a9e5dd
SW		 500 ceph_con_open(&s->s_con, CEPH_ENTITY_TYPE_MDS, mds,
501 ceph_mdsmap_get_addr(mdsc->mdsmap, mds));
42ce56e5 502
2f2dc053 503 return s;
42ce56e5
SW		 504
505fail_realloc:
506 kfree(s);
507 return ERR_PTR(-ENOMEM);
2f2dc053
SW		 508}
509
510/*
511 * called under mdsc->mutex
512 */
2600d2dd 513static void __unregister_session(struct ceph_mds_client *mdsc,
42ce56e5 514 struct ceph_mds_session *s)
2f2dc053 515{
2600d2dd
SW		 516 dout("__unregister_session mds%d %p\n", s->s_mds, s);
517 BUG_ON(mdsc->sessions[s->s_mds] != s);
42ce56e5
SW		 518 mdsc->sessions[s->s_mds] = NULL;
519 ceph_con_close(&s->s_con);
520 ceph_put_mds_session(s);
86d8f67b 521 atomic_dec(&mdsc->num_sessions);
2f2dc053
SW		 522}
523
524/*
525 * drop session refs in request.
526 *
527 * should be last request ref, or hold mdsc->mutex
528 */
529static void put_request_session(struct ceph_mds_request *req)
530{
531 if (req->r_session) {
532 ceph_put_mds_session(req->r_session);
533 req->r_session = NULL;
534 }
535}
536
153c8e6b 537void ceph_mdsc_release_request(struct kref *kref)
2f2dc053 538{
153c8e6b
SW		 539 struct ceph_mds_request *req = container_of(kref,
540 struct ceph_mds_request,
541 r_kref);
54008399 542 destroy_reply_info(&req->r_reply_info);
153c8e6b
SW		 543 if (req->r_request)
544 ceph_msg_put(req->r_request);
54008399 545 if (req->r_reply)
153c8e6b 546 ceph_msg_put(req->r_reply);
153c8e6b 547 if (req->r_inode) {
41b02e1f 548 ceph_put_cap_refs(ceph_inode(req->r_inode), CEPH_CAP_PIN);
153c8e6b
SW		 549 iput(req->r_inode);
550 }
3dd69aab
JL		 551 if (req->r_parent)
552 ceph_put_cap_refs(ceph_inode(req->r_parent), CEPH_CAP_PIN);
e96a650a 553 iput(req->r_target_inode);
153c8e6b
SW		 554 if (req->r_dentry)
555 dput(req->r_dentry);
844d87c3
SW		 556 if (req->r_old_dentry)
557 dput(req->r_old_dentry);
558 if (req->r_old_dentry_dir) {
41b02e1f
SW		 559 /*
560 * track (and drop pins for) r_old_dentry_dir
561 * separately, since r_old_dentry's d_parent may have
562 * changed between the dir mutex being dropped and
563 * this request being freed.
564 */
565 ceph_put_cap_refs(ceph_inode(req->r_old_dentry_dir),
566 CEPH_CAP_PIN);
41b02e1f 567 iput(req->r_old_dentry_dir);
2f2dc053 568 }
153c8e6b
SW		 569 kfree(req->r_path1);
570 kfree(req->r_path2);
25e6bae3
YZ		 571 if (req->r_pagelist)
572 ceph_pagelist_release(req->r_pagelist);
153c8e6b 573 put_request_session(req);
37151668 574 ceph_unreserve_caps(req->r_mdsc, &req->r_caps_reservation);
153c8e6b 575 kfree(req);
2f2dc053
SW		 576}
577
fcd00b68
ID		 578DEFINE_RB_FUNCS(request, struct ceph_mds_request, r_tid, r_node)
579
2f2dc053
SW		 580/*
581 * lookup session, bump ref if found.
582 *
583 * called under mdsc->mutex.
584 */
fcd00b68
ID		 585static struct ceph_mds_request *
586lookup_get_request(struct ceph_mds_client *mdsc, u64 tid)
2f2dc053
SW		 587{
588 struct ceph_mds_request *req;
44ca18f2 589
fcd00b68
ID		 590 req = lookup_request(&mdsc->request_tree, tid);
591 if (req)
592 ceph_mdsc_get_request(req);
44ca18f2 593
fcd00b68 594 return req;
2f2dc053
SW		 595}
596
597/*
598 * Register an in-flight request, and assign a tid. Link to directory
599 * are modifying (if any).
600 *
601 * Called under mdsc->mutex.
602 */
603static void __register_request(struct ceph_mds_client *mdsc,
604 struct ceph_mds_request *req,
605 struct inode *dir)
606{
607 req->r_tid = ++mdsc->last_tid;
608 if (req->r_num_caps)
37151668
YS		 609 ceph_reserve_caps(mdsc, &req->r_caps_reservation,
610 req->r_num_caps);
2f2dc053
SW		 611 dout("__register_request %p tid %lld\n", req, req->r_tid);
612 ceph_mdsc_get_request(req);
fcd00b68 613 insert_request(&mdsc->request_tree, req);
2f2dc053 614
cb4276cc
SW		 615 req->r_uid = current_fsuid();
616 req->r_gid = current_fsgid();
617
e8a7b8b1
YZ		 618 if (mdsc->oldest_tid == 0 && req->r_op != CEPH_MDS_OP_SETFILELOCK)
619 mdsc->oldest_tid = req->r_tid;
620
2f2dc053 621 if (dir) {
3b663780 622 ihold(dir);
2f2dc053 623 req->r_unsafe_dir = dir;
2f2dc053
SW		 624 }
625}
626
627static void __unregister_request(struct ceph_mds_client *mdsc,
628 struct ceph_mds_request *req)
629{
630 dout("__unregister_request %p tid %lld\n", req, req->r_tid);
e8a7b8b1 631
df963ea8
JL		 632 /* Never leave an unregistered request on an unsafe list! */
633 list_del_init(&req->r_unsafe_item);
634
e8a7b8b1
YZ		 635 if (req->r_tid == mdsc->oldest_tid) {
636 struct rb_node *p = rb_next(&req->r_node);
637 mdsc->oldest_tid = 0;
638 while (p) {
639 struct ceph_mds_request *next_req =
640 rb_entry(p, struct ceph_mds_request, r_node);
641 if (next_req->r_op != CEPH_MDS_OP_SETFILELOCK) {
642 mdsc->oldest_tid = next_req->r_tid;
643 break;
644 }
645 p = rb_next(p);
646 }
647 }
648
fcd00b68 649 erase_request(&mdsc->request_tree, req);
2f2dc053 650
bc2de10d
JL		 651 if (req->r_unsafe_dir &&
652 test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) {
2f2dc053 653 struct ceph_inode_info *ci = ceph_inode(req->r_unsafe_dir);
2f2dc053
SW		 654 spin_lock(&ci->i_unsafe_lock);
655 list_del_init(&req->r_unsafe_dir_item);
656 spin_unlock(&ci->i_unsafe_lock);
4c06ace8 657 }
bc2de10d
JL		 658 if (req->r_target_inode &&
659 test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) {
68cd5b4b
YZ		 660 struct ceph_inode_info *ci = ceph_inode(req->r_target_inode);
661 spin_lock(&ci->i_unsafe_lock);
662 list_del_init(&req->r_unsafe_target_item);
663 spin_unlock(&ci->i_unsafe_lock);
664 }
3b663780 665
4c06ace8 666 if (req->r_unsafe_dir) {
3b663780
SW		 667 iput(req->r_unsafe_dir);
668 req->r_unsafe_dir = NULL;
2f2dc053 669 }
94aa8ae1 670
fc55d2c9
YZ		 671 complete_all(&req->r_safe_completion);
672
94aa8ae1 673 ceph_mdsc_put_request(req);
2f2dc053
SW		 674}
675
30c71233
JL		 676/*
677 * Walk back up the dentry tree until we hit a dentry representing a
678 * non-snapshot inode. We do this using the rcu_read_lock (which must be held
679 * when calling this) to ensure that the objects won't disappear while we're
680 * working with them. Once we hit a candidate dentry, we attempt to take a
681 * reference to it, and return that as the result.
682 */
f1075480
DC		 683static struct inode *get_nonsnap_parent(struct dentry *dentry)
684{
685 struct inode *inode = NULL;
30c71233
JL		 686
687 while (dentry && !IS_ROOT(dentry)) {
688 inode = d_inode_rcu(dentry);
689 if (!inode || ceph_snap(inode) == CEPH_NOSNAP)
690 break;
691 dentry = dentry->d_parent;
692 }
693 if (inode)
694 inode = igrab(inode);
695 return inode;
696}
697
2f2dc053
SW		 698/*
699 * Choose mds to send request to next. If there is a hint set in the
700 * request (e.g., due to a prior forward hint from the mds), use that.
701 * Otherwise, consult frag tree and/or caps to identify the
702 * appropriate mds. If all else fails, choose randomly.
703 *
704 * Called under mdsc->mutex.
705 */
706static int __choose_mds(struct ceph_mds_client *mdsc,
707 struct ceph_mds_request *req)
708{
709 struct inode *inode;
710 struct ceph_inode_info *ci;
711 struct ceph_cap *cap;
712 int mode = req->r_direct_mode;
713 int mds = -1;
714 u32 hash = req->r_direct_hash;
bc2de10d 715 bool is_hash = test_bit(CEPH_MDS_R_DIRECT_IS_HASH, &req->r_req_flags);
2f2dc053
SW		 716
717 /*
718 * is there a specific mds we should try? ignore hint if we have
719 * no session and the mds is not up (active or recovering).
720 */
721 if (req->r_resend_mds >= 0 &&
722 (__have_session(mdsc, req->r_resend_mds) ||
723 ceph_mdsmap_get_state(mdsc->mdsmap, req->r_resend_mds) > 0)) {
724 dout("choose_mds using resend_mds mds%d\n",
725 req->r_resend_mds);
726 return req->r_resend_mds;
727 }
728
729 if (mode == USE_RANDOM_MDS)
730 goto random;
731
732 inode = NULL;
733 if (req->r_inode) {
5d37ca14
YZ		 734 if (ceph_snap(req->r_inode) != CEPH_SNAPDIR) {
735 inode = req->r_inode;
736 ihold(inode);
737 } else {
38f340cc
YZ		 738 /* req->r_dentry is non-null for LSSNAP request */
739 rcu_read_lock();
740 inode = get_nonsnap_parent(req->r_dentry);
741 rcu_read_unlock();
742 dout("__choose_mds using snapdir's parent %p\n", inode);
5d37ca14 743 }
38f340cc 744 } else if (req->r_dentry) {
d79698da 745 /* ignore race with rename; old or new d_parent is okay */
30c71233
JL		 746 struct dentry *parent;
747 struct inode *dir;
748
749 rcu_read_lock();
750 parent = req->r_dentry->d_parent;
3dd69aab 751 dir = req->r_parent ? : d_inode_rcu(parent);
eb6bb1c5 752
30c71233
JL		 753 if (!dir || dir->i_sb != mdsc->fsc->sb) {
754 /* not this fs or parent went negative */
2b0143b5 755 inode = d_inode(req->r_dentry);
30c71233
JL		 756 if (inode)
757 ihold(inode);
eb6bb1c5
SW		 758 } else if (ceph_snap(dir) != CEPH_NOSNAP) {
759 /* direct snapped/virtual snapdir requests
760 * based on parent dir inode */
30c71233 761 inode = get_nonsnap_parent(parent);
eb6bb1c5 762 dout("__choose_mds using nonsnap parent %p\n", inode);
ca18bede 763 } else {
eb6bb1c5 764 /* dentry target */
2b0143b5 765 inode = d_inode(req->r_dentry);
ca18bede
YZ		 766 if (!inode || mode == USE_AUTH_MDS) {
767 /* dir + name */
30c71233 768 inode = igrab(dir);
ca18bede
YZ		 769 hash = ceph_dentry_hash(dir, req->r_dentry);
770 is_hash = true;
30c71233
JL		 771 } else {
772 ihold(inode);
ca18bede 773 }
2f2dc053 774 }
30c71233 775 rcu_read_unlock();
2f2dc053 776 }
eb6bb1c5 777
2f2dc053
SW		 778 dout("__choose_mds %p is_hash=%d (%d) mode %d\n", inode, (int)is_hash,
779 (int)hash, mode);
780 if (!inode)
781 goto random;
782 ci = ceph_inode(inode);
783
784 if (is_hash && S_ISDIR(inode->i_mode)) {
785 struct ceph_inode_frag frag;
786 int found;
787
788 ceph_choose_frag(ci, hash, &frag, &found);
789 if (found) {
790 if (mode == USE_ANY_MDS && frag.ndist > 0) {
791 u8 r;
792
793 /* choose a random replica */
794 get_random_bytes(&r, 1);
795 r %= frag.ndist;
796 mds = frag.dist[r];
797 dout("choose_mds %p %llx.%llx "
798 "frag %u mds%d (%d/%d)\n",
799 inode, ceph_vinop(inode),
d66bbd44 800 frag.frag, mds,
2f2dc053 801 (int)r, frag.ndist);
d66bbd44
SW		 802 if (ceph_mdsmap_get_state(mdsc->mdsmap, mds) >=
803 CEPH_MDS_STATE_ACTIVE)
30c71233 804 goto out;
2f2dc053
SW		 805 }
806
807 /* since this file/dir wasn't known to be
808 * replicated, then we want to look for the
809 * authoritative mds. */
810 mode = USE_AUTH_MDS;
811 if (frag.mds >= 0) {
812 /* choose auth mds */
813 mds = frag.mds;
814 dout("choose_mds %p %llx.%llx "
815 "frag %u mds%d (auth)\n",
816 inode, ceph_vinop(inode), frag.frag, mds);
d66bbd44
SW		 817 if (ceph_mdsmap_get_state(mdsc->mdsmap, mds) >=
818 CEPH_MDS_STATE_ACTIVE)
30c71233 819 goto out;
2f2dc053
SW		 820 }
821 }
822 }
823
be655596 824 spin_lock(&ci->i_ceph_lock);
2f2dc053
SW		 825 cap = NULL;
826 if (mode == USE_AUTH_MDS)
827 cap = ci->i_auth_cap;
828 if (!cap && !RB_EMPTY_ROOT(&ci->i_caps))
829 cap = rb_entry(rb_first(&ci->i_caps), struct ceph_cap, ci_node);
830 if (!cap) {
be655596 831 spin_unlock(&ci->i_ceph_lock);
30c71233 832 iput(inode);
2f2dc053
SW		 833 goto random;
834 }
835 mds = cap->session->s_mds;
836 dout("choose_mds %p %llx.%llx mds%d (%scap %p)\n",
837 inode, ceph_vinop(inode), mds,
838 cap == ci->i_auth_cap ? "auth " : "", cap);
be655596 839 spin_unlock(&ci->i_ceph_lock);
30c71233
JL		 840out:
841 iput(inode);
2f2dc053
SW		 842 return mds;
843
844random:
845 mds = ceph_mdsmap_get_random_mds(mdsc->mdsmap);
846 dout("choose_mds chose random mds%d\n", mds);
847 return mds;
848}
849
850
851/*
852 * session messages
853 */
854static struct ceph_msg *create_session_msg(u32 op, u64 seq)
855{
856 struct ceph_msg *msg;
857 struct ceph_mds_session_head *h;
858
b61c2763
SW		 859 msg = ceph_msg_new(CEPH_MSG_CLIENT_SESSION, sizeof(*h), GFP_NOFS,
860 false);
a79832f2 861 if (!msg) {
2f2dc053 862 pr_err("create_session_msg ENOMEM creating msg\n");
a79832f2 863 return NULL;
2f2dc053
SW		 864 }
865 h = msg->front.iov_base;
866 h->op = cpu_to_le32(op);
867 h->seq = cpu_to_le64(seq);
dbd0c8bf
JS		 868
869 return msg;
870}
871
872/*
873 * session message, specialization for CEPH_SESSION_REQUEST_OPEN
874 * to include additional client metadata fields.
875 */
876static struct ceph_msg *create_session_open_msg(struct ceph_mds_client *mdsc, u64 seq)
877{
878 struct ceph_msg *msg;
879 struct ceph_mds_session_head *h;
880 int i = -1;
881 int metadata_bytes = 0;
882 int metadata_key_count = 0;
883 struct ceph_options *opt = mdsc->fsc->client->options;
3f384954 884 struct ceph_mount_options *fsopt = mdsc->fsc->mount_options;
dbd0c8bf
JS		 885 void *p;
886
a6a5ce4f 887 const char* metadata[][2] = {
717e6f28
YZ		 888 {"hostname", mdsc->nodename},
889 {"kernel_version", init_utsname()->release},
3f384954
YZ		 890 {"entity_id", opt->name ? : ""},
891 {"root", fsopt->server_path ? : "/"},
dbd0c8bf
JS		 892 {NULL, NULL}
893 };
894
895 /* Calculate serialized length of metadata */
896 metadata_bytes = 4; /* map length */
d37b1d99 897 for (i = 0; metadata[i][0]; ++i) {
dbd0c8bf
JS		 898 metadata_bytes += 8 + strlen(metadata[i][0]) +
899 strlen(metadata[i][1]);
900 metadata_key_count++;
901 }
902
903 /* Allocate the message */
904 msg = ceph_msg_new(CEPH_MSG_CLIENT_SESSION, sizeof(*h) + metadata_bytes,
905 GFP_NOFS, false);
906 if (!msg) {
907 pr_err("create_session_msg ENOMEM creating msg\n");
908 return NULL;
909 }
910 h = msg->front.iov_base;
911 h->op = cpu_to_le32(CEPH_SESSION_REQUEST_OPEN);
912 h->seq = cpu_to_le64(seq);
913
914 /*
915 * Serialize client metadata into waiting buffer space, using
916 * the format that userspace expects for map<string, string>
7cfa0313
JS		 917 *
918 * ClientSession messages with metadata are v2
dbd0c8bf 919 */
7cfa0313
JS		 920 msg->hdr.version = cpu_to_le16(2);
921 msg->hdr.compat_version = cpu_to_le16(1);
dbd0c8bf
JS		 922
923 /* The write pointer, following the session_head structure */
924 p = msg->front.iov_base + sizeof(*h);
925
926 /* Number of entries in the map */
927 ceph_encode_32(&p, metadata_key_count);
928
929 /* Two length-prefixed strings for each entry in the map */
d37b1d99 930 for (i = 0; metadata[i][0]; ++i) {
dbd0c8bf
JS		 931 size_t const key_len = strlen(metadata[i][0]);
932 size_t const val_len = strlen(metadata[i][1]);
933
934 ceph_encode_32(&p, key_len);
935 memcpy(p, metadata[i][0], key_len);
936 p += key_len;
937 ceph_encode_32(&p, val_len);
938 memcpy(p, metadata[i][1], val_len);
939 p += val_len;
940 }
941
2f2dc053
SW		 942 return msg;
943}
944
945/*
946 * send session open request.
947 *
948 * called under mdsc->mutex
949 */
950static int __open_session(struct ceph_mds_client *mdsc,
951 struct ceph_mds_session *session)
952{
953 struct ceph_msg *msg;
954 int mstate;
955 int mds = session->s_mds;
2f2dc053
SW		 956
957 /* wait for mds to go active? */
958 mstate = ceph_mdsmap_get_state(mdsc->mdsmap, mds);
959 dout("open_session to mds%d (%s)\n", mds,
960 ceph_mds_state_name(mstate));
961 session->s_state = CEPH_MDS_SESSION_OPENING;
962 session->s_renew_requested = jiffies;
963
964 /* send connect message */
dbd0c8bf 965 msg = create_session_open_msg(mdsc, session->s_seq);
a79832f2
SW		 966 if (!msg)
967 return -ENOMEM;
2f2dc053 968 ceph_con_send(&session->s_con, msg);
2f2dc053
SW		 969 return 0;
970}
971
ed0552a1
SW		 972/*
973 * open sessions for any export targets for the given mds
974 *
975 * called under mdsc->mutex
976 */
5d72d13c
YZ		 977static struct ceph_mds_session *
978__open_export_target_session(struct ceph_mds_client *mdsc, int target)
979{
980 struct ceph_mds_session *session;
981
982 session = __ceph_lookup_mds_session(mdsc, target);
983 if (!session) {
984 session = register_session(mdsc, target);
985 if (IS_ERR(session))
986 return session;
987 }
988 if (session->s_state == CEPH_MDS_SESSION_NEW ||
989 session->s_state == CEPH_MDS_SESSION_CLOSING)
990 __open_session(mdsc, session);
991
992 return session;
993}
994
995struct ceph_mds_session *
996ceph_mdsc_open_export_target_session(struct ceph_mds_client *mdsc, int target)
997{
998 struct ceph_mds_session *session;
999
1000 dout("open_export_target_session to mds%d\n", target);
1001
1002 mutex_lock(&mdsc->mutex);
1003 session = __open_export_target_session(mdsc, target);
1004 mutex_unlock(&mdsc->mutex);
1005
1006 return session;
1007}
1008
ed0552a1
SW		 1009static void __open_export_target_sessions(struct ceph_mds_client *mdsc,
1010 struct ceph_mds_session *session)
1011{
1012 struct ceph_mds_info *mi;
1013 struct ceph_mds_session *ts;
1014 int i, mds = session->s_mds;
ed0552a1 1015
76201b63 1016 if (mds >= mdsc->mdsmap->m_num_mds)
ed0552a1 1017 return;
5d72d13c 1018
ed0552a1
SW		 1019 mi = &mdsc->mdsmap->m_info[mds];
1020 dout("open_export_target_sessions for mds%d (%d targets)\n",
1021 session->s_mds, mi->num_export_targets);
1022
1023 for (i = 0; i < mi->num_export_targets; i++) {
5d72d13c
YZ		 1024 ts = __open_export_target_session(mdsc, mi->export_targets[i]);
1025 if (!IS_ERR(ts))
1026 ceph_put_mds_session(ts);
ed0552a1
SW		 1027 }
1028}
1029
154f42c2
SW		 1030void ceph_mdsc_open_export_target_sessions(struct ceph_mds_client *mdsc,
1031 struct ceph_mds_session *session)
1032{
1033 mutex_lock(&mdsc->mutex);
1034 __open_export_target_sessions(mdsc, session);
1035 mutex_unlock(&mdsc->mutex);
1036}
1037
2f2dc053
SW		 1038/*
1039 * session caps
1040 */
1041
745a8e3b
YZ		 1042/* caller holds s_cap_lock, we drop it */
1043static void cleanup_cap_releases(struct ceph_mds_client *mdsc,
1044 struct ceph_mds_session *session)
1045 __releases(session->s_cap_lock)
2f2dc053 1046{
745a8e3b
YZ		 1047 LIST_HEAD(tmp_list);
1048 list_splice_init(&session->s_cap_releases, &tmp_list);
1049 session->s_num_cap_releases = 0;
1050 spin_unlock(&session->s_cap_lock);
2f2dc053 1051
745a8e3b
YZ		 1052 dout("cleanup_cap_releases mds%d\n", session->s_mds);
1053 while (!list_empty(&tmp_list)) {
1054 struct ceph_cap *cap;
1055 /* zero out the in-progress message */
1056 cap = list_first_entry(&tmp_list,
1057 struct ceph_cap, session_caps);
1058 list_del(&cap->session_caps);
1059 ceph_put_cap(mdsc, cap);
2f2dc053 1060 }
2f2dc053
SW		 1061}
1062
1c841a96
YZ		 1063static void cleanup_session_requests(struct ceph_mds_client *mdsc,
1064 struct ceph_mds_session *session)
1065{
1066 struct ceph_mds_request *req;
1067 struct rb_node *p;
1068
1069 dout("cleanup_session_requests mds%d\n", session->s_mds);
1070 mutex_lock(&mdsc->mutex);
1071 while (!list_empty(&session->s_unsafe)) {
1072 req = list_first_entry(&session->s_unsafe,
1073 struct ceph_mds_request, r_unsafe_item);
3e0708b9
YZ		 1074 pr_warn_ratelimited(" dropping unsafe request %llu\n",
1075 req->r_tid);
1c841a96
YZ		 1076 __unregister_request(mdsc, req);
1077 }
1078 /* zero r_attempts, so kick_requests() will re-send requests */
1079 p = rb_first(&mdsc->request_tree);
1080 while (p) {
1081 req = rb_entry(p, struct ceph_mds_request, r_node);
1082 p = rb_next(p);
1083 if (req->r_session &&
1084 req->r_session->s_mds == session->s_mds)
1085 req->r_attempts = 0;
1086 }
1087 mutex_unlock(&mdsc->mutex);
1088}
1089
2f2dc053 1090/*
f818a736
SW		 1091 * Helper to safely iterate over all caps associated with a session, with
1092 * special care taken to handle a racing __ceph_remove_cap().
2f2dc053 1093 *
f818a736 1094 * Caller must hold session s_mutex.
2f2dc053
SW		 1095 */
1096static int iterate_session_caps(struct ceph_mds_session *session,
1097 int (*cb)(struct inode *, struct ceph_cap *,
1098 void *), void *arg)
1099{
7c1332b8
SW		 1100 struct list_head *p;
1101 struct ceph_cap *cap;
1102 struct inode *inode, *last_inode = NULL;
1103 struct ceph_cap *old_cap = NULL;
2f2dc053
SW		 1104 int ret;
1105
1106 dout("iterate_session_caps %p mds%d\n", session, session->s_mds);
1107 spin_lock(&session->s_cap_lock);
7c1332b8
SW		 1108 p = session->s_caps.next;
1109 while (p != &session->s_caps) {
1110 cap = list_entry(p, struct ceph_cap, session_caps);
2f2dc053 1111 inode = igrab(&cap->ci->vfs_inode);
7c1332b8
SW		 1112 if (!inode) {
1113 p = p->next;
2f2dc053 1114 continue;
7c1332b8
SW		 1115 }
1116 session->s_cap_iterator = cap;
2f2dc053 1117 spin_unlock(&session->s_cap_lock);
7c1332b8
SW		 1118
1119 if (last_inode) {
1120 iput(last_inode);
1121 last_inode = NULL;
1122 }
1123 if (old_cap) {
37151668 1124 ceph_put_cap(session->s_mdsc, old_cap);
7c1332b8
SW		 1125 old_cap = NULL;
1126 }
1127
2f2dc053 1128 ret = cb(inode, cap, arg);
7c1332b8
SW		 1129 last_inode = inode;
1130
2f2dc053 1131 spin_lock(&session->s_cap_lock);
7c1332b8 1132 p = p->next;
d37b1d99 1133 if (!cap->ci) {
7c1332b8
SW		 1134 dout("iterate_session_caps finishing cap %p removal\n",
1135 cap);
1136 BUG_ON(cap->session != session);
745a8e3b 1137 cap->session = NULL;
7c1332b8
SW		 1138 list_del_init(&cap->session_caps);
1139 session->s_nr_caps--;
745a8e3b
YZ		 1140 if (cap->queue_release) {
1141 list_add_tail(&cap->session_caps,
1142 &session->s_cap_releases);
1143 session->s_num_cap_releases++;
1144 } else {
1145 old_cap = cap; /* put_cap it w/o locks held */
1146 }
7c1332b8 1147 }
5dacf091
SW		 1148 if (ret < 0)
1149 goto out;
2f2dc053 1150 }
5dacf091
SW		 1151 ret = 0;
1152out:
7c1332b8 1153 session->s_cap_iterator = NULL;
2f2dc053 1154 spin_unlock(&session->s_cap_lock);
7c1332b8 1155
e96a650a 1156 iput(last_inode);
7c1332b8 1157 if (old_cap)
37151668 1158 ceph_put_cap(session->s_mdsc, old_cap);
7c1332b8 1159
5dacf091 1160 return ret;
2f2dc053
SW		 1161}
1162
1163static int remove_session_caps_cb(struct inode *inode, struct ceph_cap *cap,
6c99f254 1164 void *arg)
2f2dc053 1165{
6c93df5d 1166 struct ceph_fs_client *fsc = (struct ceph_fs_client *)arg;
2f2dc053 1167 struct ceph_inode_info *ci = ceph_inode(inode);
553adfd9 1168 LIST_HEAD(to_remove);
6c93df5d
YZ		 1169 bool drop = false;
1170 bool invalidate = false;
6c99f254 1171
2f2dc053
SW		 1172 dout("removing cap %p, ci is %p, inode is %p\n",
1173 cap, ci, &ci->vfs_inode);
be655596 1174 spin_lock(&ci->i_ceph_lock);
a096b09a 1175 __ceph_remove_cap(cap, false);
571ade33 1176 if (!ci->i_auth_cap) {
553adfd9 1177 struct ceph_cap_flush *cf;
6c93df5d 1178 struct ceph_mds_client *mdsc = fsc->mdsc;
6c99f254 1179
77310320
YZ		 1180 ci->i_ceph_flags |= CEPH_I_CAP_DROPPED;
1181
6c93df5d 1182 if (ci->i_wrbuffer_ref > 0 &&
52953d55 1183 READ_ONCE(fsc->mount_state) == CEPH_MOUNT_SHUTDOWN)
6c93df5d
YZ		 1184 invalidate = true;
1185
e4500b5e
YZ		 1186 while (!list_empty(&ci->i_cap_flush_list)) {
1187 cf = list_first_entry(&ci->i_cap_flush_list,
1188 struct ceph_cap_flush, i_list);
8cdcc07d 1189 list_move(&cf->i_list, &to_remove);
553adfd9
YZ		 1190 }
1191
6c99f254 1192 spin_lock(&mdsc->cap_dirty_lock);
8310b089 1193
e4500b5e
YZ		 1194 list_for_each_entry(cf, &to_remove, i_list)
1195 list_del(&cf->g_list);
8310b089 1196
6c99f254 1197 if (!list_empty(&ci->i_dirty_item)) {
3e0708b9
YZ		 1198 pr_warn_ratelimited(
1199 " dropping dirty %s state for %p %lld\n",
6c99f254
SW		 1200 ceph_cap_string(ci->i_dirty_caps),
1201 inode, ceph_ino(inode));
1202 ci->i_dirty_caps = 0;
1203 list_del_init(&ci->i_dirty_item);
6c93df5d 1204 drop = true;
6c99f254
SW		 1205 }
1206 if (!list_empty(&ci->i_flushing_item)) {
3e0708b9
YZ		 1207 pr_warn_ratelimited(
1208 " dropping dirty+flushing %s state for %p %lld\n",
6c99f254
SW		 1209 ceph_cap_string(ci->i_flushing_caps),
1210 inode, ceph_ino(inode));
1211 ci->i_flushing_caps = 0;
1212 list_del_init(&ci->i_flushing_item);
1213 mdsc->num_cap_flushing--;
6c93df5d 1214 drop = true;
6c99f254 1215 }
6c99f254 1216 spin_unlock(&mdsc->cap_dirty_lock);
553adfd9 1217
f66fd9f0 1218 if (!ci->i_dirty_caps && ci->i_prealloc_cap_flush) {
e4500b5e 1219 list_add(&ci->i_prealloc_cap_flush->i_list, &to_remove);
f66fd9f0
YZ		 1220 ci->i_prealloc_cap_flush = NULL;
1221 }
6c99f254 1222 }
be655596 1223 spin_unlock(&ci->i_ceph_lock);
553adfd9
YZ		 1224 while (!list_empty(&to_remove)) {
1225 struct ceph_cap_flush *cf;
1226 cf = list_first_entry(&to_remove,
e4500b5e
YZ		 1227 struct ceph_cap_flush, i_list);
1228 list_del(&cf->i_list);
f66fd9f0 1229 ceph_free_cap_flush(cf);
553adfd9 1230 }
77310320
YZ		 1231
1232 wake_up_all(&ci->i_cap_wq);
6c93df5d
YZ		 1233 if (invalidate)
1234 ceph_queue_invalidate(inode);
77310320 1235 if (drop)
6c99f254 1236 iput(inode);
2f2dc053
SW		 1237 return 0;
1238}
1239
1240/*
1241 * caller must hold session s_mutex
1242 */
1243static void remove_session_caps(struct ceph_mds_session *session)
1244{
6c93df5d
YZ		 1245 struct ceph_fs_client *fsc = session->s_mdsc->fsc;
1246 struct super_block *sb = fsc->sb;
2f2dc053 1247 dout("remove_session_caps on %p\n", session);
6c93df5d 1248 iterate_session_caps(session, remove_session_caps_cb, fsc);
6f60f889 1249
c8799fc4
YZ		 1250 wake_up_all(&fsc->mdsc->cap_flushing_wq);
1251
6f60f889
YZ		 1252 spin_lock(&session->s_cap_lock);
1253 if (session->s_nr_caps > 0) {
6f60f889
YZ		 1254 struct inode *inode;
1255 struct ceph_cap *cap, *prev = NULL;
1256 struct ceph_vino vino;
1257 /*
1258 * iterate_session_caps() skips inodes that are being
1259 * deleted, we need to wait until deletions are complete.
1260 * __wait_on_freeing_inode() is designed for the job,
1261 * but it is not exported, so use lookup inode function
1262 * to access it.
1263 */
1264 while (!list_empty(&session->s_caps)) {
1265 cap = list_entry(session->s_caps.next,
1266 struct ceph_cap, session_caps);
1267 if (cap == prev)
1268 break;
1269 prev = cap;
1270 vino = cap->ci->i_vino;
1271 spin_unlock(&session->s_cap_lock);
1272
ed284c49 1273 inode = ceph_find_inode(sb, vino);
6f60f889
YZ		 1274 iput(inode);
1275
1276 spin_lock(&session->s_cap_lock);
1277 }
1278 }
745a8e3b
YZ		 1279
1280 // drop cap expires and unlock s_cap_lock
1281 cleanup_cap_releases(session->s_mdsc, session);
6f60f889 1282
2f2dc053 1283 BUG_ON(session->s_nr_caps > 0);
6c99f254 1284 BUG_ON(!list_empty(&session->s_cap_flushing));
2f2dc053
SW		 1285}
1286
1287/*
1288 * wake up any threads waiting on this session's caps. if the cap is
1289 * old (didn't get renewed on the client reconnect), remove it now.
1290 *
1291 * caller must hold s_mutex.
1292 */
1293static int wake_up_session_cb(struct inode *inode, struct ceph_cap *cap,
1294 void *arg)
1295{
0dc2570f
SW		 1296 struct ceph_inode_info *ci = ceph_inode(inode);
1297
0dc2570f 1298 if (arg) {
be655596 1299 spin_lock(&ci->i_ceph_lock);
0dc2570f
SW		 1300 ci->i_wanted_max_size = 0;
1301 ci->i_requested_max_size = 0;
be655596 1302 spin_unlock(&ci->i_ceph_lock);
0dc2570f 1303 }
e5360309 1304 wake_up_all(&ci->i_cap_wq);
2f2dc053
SW		 1305 return 0;
1306}
1307
0dc2570f
SW		 1308static void wake_up_session_caps(struct ceph_mds_session *session,
1309 int reconnect)
2f2dc053
SW		 1310{
1311 dout("wake_up_session_caps %p mds%d\n", session, session->s_mds);
0dc2570f
SW		 1312 iterate_session_caps(session, wake_up_session_cb,
1313 (void *)(unsigned long)reconnect);
2f2dc053
SW		 1314}
1315
1316/*
1317 * Send periodic message to MDS renewing all currently held caps. The
1318 * ack will reset the expiration for all caps from this session.
1319 *
1320 * caller holds s_mutex
1321 */
1322static int send_renew_caps(struct ceph_mds_client *mdsc,
1323 struct ceph_mds_session *session)
1324{
1325 struct ceph_msg *msg;
1326 int state;
1327
1328 if (time_after_eq(jiffies, session->s_cap_ttl) &&
1329 time_after_eq(session->s_cap_ttl, session->s_renew_requested))
1330 pr_info("mds%d caps stale\n", session->s_mds);
e4cb4cb8 1331 session->s_renew_requested = jiffies;
2f2dc053
SW		 1332
1333 /* do not try to renew caps until a recovering mds has reconnected
1334 * with its clients. */
1335 state = ceph_mdsmap_get_state(mdsc->mdsmap, session->s_mds);
1336 if (state < CEPH_MDS_STATE_RECONNECT) {
1337 dout("send_renew_caps ignoring mds%d (%s)\n",
1338 session->s_mds, ceph_mds_state_name(state));
1339 return 0;
1340 }
1341
1342 dout("send_renew_caps to mds%d (%s)\n", session->s_mds,
1343 ceph_mds_state_name(state));
2f2dc053
SW		 1344 msg = create_session_msg(CEPH_SESSION_REQUEST_RENEWCAPS,
1345 ++session->s_renew_seq);
a79832f2
SW		 1346 if (!msg)
1347 return -ENOMEM;
2f2dc053
SW		 1348 ceph_con_send(&session->s_con, msg);
1349 return 0;
1350}
1351
186e4f7a
YZ		 1352static int send_flushmsg_ack(struct ceph_mds_client *mdsc,
1353 struct ceph_mds_session *session, u64 seq)
1354{
1355 struct ceph_msg *msg;
1356
1357 dout("send_flushmsg_ack to mds%d (%s)s seq %lld\n",
a687ecaf 1358 session->s_mds, ceph_session_state_name(session->s_state), seq);
186e4f7a
YZ		 1359 msg = create_session_msg(CEPH_SESSION_FLUSHMSG_ACK, seq);
1360 if (!msg)
1361 return -ENOMEM;
1362 ceph_con_send(&session->s_con, msg);
1363 return 0;
1364}
1365
1366
2f2dc053
SW		 1367/*
1368 * Note new cap ttl, and any transition from stale -> not stale (fresh?).
0dc2570f
SW		 1369 *
1370 * Called under session->s_mutex
2f2dc053
SW		 1371 */
1372static void renewed_caps(struct ceph_mds_client *mdsc,
1373 struct ceph_mds_session *session, int is_renew)
1374{
1375 int was_stale;
1376 int wake = 0;
1377
1378 spin_lock(&session->s_cap_lock);
1ce208a6 1379 was_stale = is_renew && time_after_eq(jiffies, session->s_cap_ttl);
2f2dc053
SW		 1380
1381 session->s_cap_ttl = session->s_renew_requested +
1382 mdsc->mdsmap->m_session_timeout*HZ;
1383
1384 if (was_stale) {
1385 if (time_before(jiffies, session->s_cap_ttl)) {
1386 pr_info("mds%d caps renewed\n", session->s_mds);
1387 wake = 1;
1388 } else {
1389 pr_info("mds%d caps still stale\n", session->s_mds);
1390 }
1391 }
1392 dout("renewed_caps mds%d ttl now %lu, was %s, now %s\n",
1393 session->s_mds, session->s_cap_ttl, was_stale ? "stale" : "fresh",
1394 time_before(jiffies, session->s_cap_ttl) ? "stale" : "fresh");
1395 spin_unlock(&session->s_cap_lock);
1396
1397 if (wake)
0dc2570f 1398 wake_up_session_caps(session, 0);
2f2dc053
SW		 1399}
1400
1401/*
1402 * send a session close request
1403 */
1404static int request_close_session(struct ceph_mds_client *mdsc,
1405 struct ceph_mds_session *session)
1406{
1407 struct ceph_msg *msg;
2f2dc053
SW		 1408
1409 dout("request_close_session mds%d state %s seq %lld\n",
a687ecaf 1410 session->s_mds, ceph_session_state_name(session->s_state),
2f2dc053
SW		 1411 session->s_seq);
1412 msg = create_session_msg(CEPH_SESSION_REQUEST_CLOSE, session->s_seq);
a79832f2
SW		 1413 if (!msg)
1414 return -ENOMEM;
1415 ceph_con_send(&session->s_con, msg);
fcff415c 1416 return 1;
2f2dc053
SW		 1417}
1418
1419/*
1420 * Called with s_mutex held.
1421 */
1422static int __close_session(struct ceph_mds_client *mdsc,
1423 struct ceph_mds_session *session)
1424{
1425 if (session->s_state >= CEPH_MDS_SESSION_CLOSING)
1426 return 0;
1427 session->s_state = CEPH_MDS_SESSION_CLOSING;
1428 return request_close_session(mdsc, session);
1429}
1430
1431/*
1432 * Trim old(er) caps.
1433 *
1434 * Because we can't cache an inode without one or more caps, we do
1435 * this indirectly: if a cap is unused, we prune its aliases, at which
1436 * point the inode will hopefully get dropped to.
1437 *
1438 * Yes, this is a bit sloppy. Our only real goal here is to respond to
1439 * memory pressure from the MDS, though, so it needn't be perfect.
1440 */
1441static int trim_caps_cb(struct inode *inode, struct ceph_cap *cap, void *arg)
1442{
1443 struct ceph_mds_session *session = arg;
1444 struct ceph_inode_info *ci = ceph_inode(inode);
979abfdd 1445 int used, wanted, oissued, mine;
2f2dc053
SW		 1446
1447 if (session->s_trim_caps <= 0)
1448 return -1;
1449
be655596 1450 spin_lock(&ci->i_ceph_lock);
2f2dc053
SW		 1451 mine = cap->issued | cap->implemented;
1452 used = __ceph_caps_used(ci);
979abfdd 1453 wanted = __ceph_caps_file_wanted(ci);
2f2dc053
SW		 1454 oissued = __ceph_caps_issued_other(ci, cap);
1455
979abfdd 1456 dout("trim_caps_cb %p cap %p mine %s oissued %s used %s wanted %s\n",
2f2dc053 1457 inode, cap, ceph_cap_string(mine), ceph_cap_string(oissued),
979abfdd
YZ		 1458 ceph_cap_string(used), ceph_cap_string(wanted));
1459 if (cap == ci->i_auth_cap) {
622f3e25
YZ		 1460 if (ci->i_dirty_caps || ci->i_flushing_caps ||
1461 !list_empty(&ci->i_cap_snaps))
979abfdd
YZ		 1462 goto out;
1463 if ((used | wanted) & CEPH_CAP_ANY_WR)
1464 goto out;
1465 }
5e804ac4
YZ		 1466 /* The inode has cached pages, but it's no longer used.
1467 * we can safely drop it */
1468 if (wanted == 0 && used == CEPH_CAP_FILE_CACHE &&
1469 !(oissued & CEPH_CAP_FILE_CACHE)) {
1470 used = 0;
1471 oissued = 0;
1472 }
979abfdd 1473 if ((used | wanted) & ~oissued & mine)
2f2dc053
SW		 1474 goto out; /* we need these caps */
1475
1476 session->s_trim_caps--;
1477 if (oissued) {
1478 /* we aren't the only cap.. just remove us */
a096b09a 1479 __ceph_remove_cap(cap, true);
2f2dc053 1480 } else {
5e804ac4 1481 /* try dropping referring dentries */
be655596 1482 spin_unlock(&ci->i_ceph_lock);
2f2dc053
SW		 1483 d_prune_aliases(inode);
1484 dout("trim_caps_cb %p cap %p pruned, count now %d\n",
1485 inode, cap, atomic_read(&inode->i_count));
1486 return 0;
1487 }
1488
1489out:
be655596 1490 spin_unlock(&ci->i_ceph_lock);
2f2dc053
SW		 1491 return 0;
1492}
1493
1494/*
1495 * Trim session cap count down to some max number.
1496 */
1497static int trim_caps(struct ceph_mds_client *mdsc,
1498 struct ceph_mds_session *session,
1499 int max_caps)
1500{
1501 int trim_caps = session->s_nr_caps - max_caps;
1502
1503 dout("trim_caps mds%d start: %d / %d, trim %d\n",
1504 session->s_mds, session->s_nr_caps, max_caps, trim_caps);
1505 if (trim_caps > 0) {
1506 session->s_trim_caps = trim_caps;
1507 iterate_session_caps(session, trim_caps_cb, session);
1508 dout("trim_caps mds%d done: %d / %d, trimmed %d\n",
1509 session->s_mds, session->s_nr_caps, max_caps,
1510 trim_caps - session->s_trim_caps);
5dacf091 1511 session->s_trim_caps = 0;
2f2dc053 1512 }
a56371d9 1513
a56371d9 1514 ceph_send_cap_releases(mdsc, session);
2f2dc053
SW		 1515 return 0;
1516}
1517
8310b089
YZ		 1518static int check_caps_flush(struct ceph_mds_client *mdsc,
1519 u64 want_flush_tid)
1520{
8310b089
YZ		 1521 int ret = 1;
1522
1523 spin_lock(&mdsc->cap_dirty_lock);
e4500b5e
YZ		 1524 if (!list_empty(&mdsc->cap_flush_list)) {
1525 struct ceph_cap_flush *cf =
1526 list_first_entry(&mdsc->cap_flush_list,
1527 struct ceph_cap_flush, g_list);
1528 if (cf->tid <= want_flush_tid) {
1529 dout("check_caps_flush still flushing tid "
1530 "%llu <= %llu\n", cf->tid, want_flush_tid);
1531 ret = 0;
1532 }
8310b089
YZ		 1533 }
1534 spin_unlock(&mdsc->cap_dirty_lock);
1535 return ret;
d3383a8e
YZ		 1536}
1537
2f2dc053
SW		 1538/*
1539 * flush all dirty inode data to disk.
1540 *
8310b089 1541 * returns true if we've flushed through want_flush_tid
2f2dc053 1542 */
affbc19a 1543static void wait_caps_flush(struct ceph_mds_client *mdsc,
0e294387 1544 u64 want_flush_tid)
2f2dc053 1545{
0e294387 1546 dout("check_caps_flush want %llu\n", want_flush_tid);
8310b089
YZ		 1547
1548 wait_event(mdsc->cap_flushing_wq,
1549 check_caps_flush(mdsc, want_flush_tid));
1550
1551 dout("check_caps_flush ok, flushed thru %llu\n", want_flush_tid);
2f2dc053
SW		 1552}
1553
1554/*
1555 * called under s_mutex
1556 */
3d7ded4d
SW		 1557void ceph_send_cap_releases(struct ceph_mds_client *mdsc,
1558 struct ceph_mds_session *session)
2f2dc053 1559{
745a8e3b
YZ		 1560 struct ceph_msg *msg = NULL;
1561 struct ceph_mds_cap_release *head;
1562 struct ceph_mds_cap_item *item;
92475f05 1563 struct ceph_osd_client *osdc = &mdsc->fsc->client->osdc;
745a8e3b
YZ		 1564 struct ceph_cap *cap;
1565 LIST_HEAD(tmp_list);
1566 int num_cap_releases;
92475f05
JL		 1567 __le32 barrier, *cap_barrier;
1568
1569 down_read(&osdc->lock);
1570 barrier = cpu_to_le32(osdc->epoch_barrier);
1571 up_read(&osdc->lock);
2f2dc053 1572
0f8605f2 1573 spin_lock(&session->s_cap_lock);
745a8e3b
YZ		 1574again:
1575 list_splice_init(&session->s_cap_releases, &tmp_list);
1576 num_cap_releases = session->s_num_cap_releases;
1577 session->s_num_cap_releases = 0;
2f2dc053 1578 spin_unlock(&session->s_cap_lock);
e01a5946 1579
745a8e3b
YZ		 1580 while (!list_empty(&tmp_list)) {
1581 if (!msg) {
1582 msg = ceph_msg_new(CEPH_MSG_CLIENT_CAPRELEASE,
09cbfeaf 1583 PAGE_SIZE, GFP_NOFS, false);
745a8e3b
YZ		 1584 if (!msg)
1585 goto out_err;
1586 head = msg->front.iov_base;
1587 head->num = cpu_to_le32(0);
1588 msg->front.iov_len = sizeof(*head);
92475f05
JL		 1589
1590 msg->hdr.version = cpu_to_le16(2);
1591 msg->hdr.compat_version = cpu_to_le16(1);
745a8e3b 1592 }
92475f05 1593
745a8e3b
YZ		 1594 cap = list_first_entry(&tmp_list, struct ceph_cap,
1595 session_caps);
1596 list_del(&cap->session_caps);
1597 num_cap_releases--;
e01a5946 1598
00bd8edb 1599 head = msg->front.iov_base;
745a8e3b
YZ		 1600 le32_add_cpu(&head->num, 1);
1601 item = msg->front.iov_base + msg->front.iov_len;
1602 item->ino = cpu_to_le64(cap->cap_ino);
1603 item->cap_id = cpu_to_le64(cap->cap_id);
1604 item->migrate_seq = cpu_to_le32(cap->mseq);
1605 item->seq = cpu_to_le32(cap->issue_seq);
1606 msg->front.iov_len += sizeof(*item);
1607
1608 ceph_put_cap(mdsc, cap);
1609
1610 if (le32_to_cpu(head->num) == CEPH_CAPS_PER_RELEASE) {
92475f05
JL		 1611 // Append cap_barrier field
1612 cap_barrier = msg->front.iov_base + msg->front.iov_len;
1613 *cap_barrier = barrier;
1614 msg->front.iov_len += sizeof(*cap_barrier);
1615
745a8e3b
YZ		 1616 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
1617 dout("send_cap_releases mds%d %p\n", session->s_mds, msg);
1618 ceph_con_send(&session->s_con, msg);
1619 msg = NULL;
1620 }
00bd8edb 1621 }
e01a5946 1622
745a8e3b 1623 BUG_ON(num_cap_releases != 0);
e01a5946 1624
745a8e3b
YZ		 1625 spin_lock(&session->s_cap_lock);
1626 if (!list_empty(&session->s_cap_releases))
1627 goto again;
1628 spin_unlock(&session->s_cap_lock);
1629
1630 if (msg) {
92475f05
JL		 1631 // Append cap_barrier field
1632 cap_barrier = msg->front.iov_base + msg->front.iov_len;
1633 *cap_barrier = barrier;
1634 msg->front.iov_len += sizeof(*cap_barrier);
1635
745a8e3b
YZ		 1636 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
1637 dout("send_cap_releases mds%d %p\n", session->s_mds, msg);
1638 ceph_con_send(&session->s_con, msg);
e01a5946 1639 }
745a8e3b
YZ		 1640 return;
1641out_err:
1642 pr_err("send_cap_releases mds%d, failed to allocate message\n",
1643 session->s_mds);
1644 spin_lock(&session->s_cap_lock);
1645 list_splice(&tmp_list, &session->s_cap_releases);
1646 session->s_num_cap_releases += num_cap_releases;
1647 spin_unlock(&session->s_cap_lock);
e01a5946
SW		 1648}
1649
2f2dc053
SW		 1650/*
1651 * requests
1652 */
1653
54008399
YZ		 1654int ceph_alloc_readdir_reply_buffer(struct ceph_mds_request *req,
1655 struct inode *dir)
1656{
1657 struct ceph_inode_info *ci = ceph_inode(dir);
1658 struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1659 struct ceph_mount_options *opt = req->r_mdsc->fsc->mount_options;
2a5beea3 1660 size_t size = sizeof(struct ceph_mds_reply_dir_entry);
54008399
YZ		 1661 int order, num_entries;
1662
1663 spin_lock(&ci->i_ceph_lock);
1664 num_entries = ci->i_files + ci->i_subdirs;
1665 spin_unlock(&ci->i_ceph_lock);
1666 num_entries = max(num_entries, 1);
1667 num_entries = min(num_entries, opt->max_readdir);
1668
1669 order = get_order(size * num_entries);
1670 while (order >= 0) {
2a5beea3
YZ		 1671 rinfo->dir_entries = (void*)__get_free_pages(GFP_KERNEL |
1672 __GFP_NOWARN,
1673 order);
1674 if (rinfo->dir_entries)
54008399
YZ		 1675 break;
1676 order--;
1677 }
2a5beea3 1678 if (!rinfo->dir_entries)
54008399
YZ		 1679 return -ENOMEM;
1680
1681 num_entries = (PAGE_SIZE << order) / size;
1682 num_entries = min(num_entries, opt->max_readdir);
1683
1684 rinfo->dir_buf_size = PAGE_SIZE << order;
1685 req->r_num_caps = num_entries + 1;
1686 req->r_args.readdir.max_entries = cpu_to_le32(num_entries);
1687 req->r_args.readdir.max_bytes = cpu_to_le32(opt->max_readdir_bytes);
1688 return 0;
1689}
1690
2f2dc053
SW		 1691/*
1692 * Create an mds request.
1693 */
1694struct ceph_mds_request *
1695ceph_mdsc_create_request(struct ceph_mds_client *mdsc, int op, int mode)
1696{
1697 struct ceph_mds_request *req = kzalloc(sizeof(*req), GFP_NOFS);
1698
1699 if (!req)
1700 return ERR_PTR(-ENOMEM);
1701
b4556396 1702 mutex_init(&req->r_fill_mutex);
37151668 1703 req->r_mdsc = mdsc;
2f2dc053
SW		 1704 req->r_started = jiffies;
1705 req->r_resend_mds = -1;
1706 INIT_LIST_HEAD(&req->r_unsafe_dir_item);
68cd5b4b 1707 INIT_LIST_HEAD(&req->r_unsafe_target_item);
2f2dc053 1708 req->r_fmode = -1;
153c8e6b 1709 kref_init(&req->r_kref);
fcd00b68 1710 RB_CLEAR_NODE(&req->r_node);
2f2dc053
SW		 1711 INIT_LIST_HEAD(&req->r_wait);
1712 init_completion(&req->r_completion);
1713 init_completion(&req->r_safe_completion);
1714 INIT_LIST_HEAD(&req->r_unsafe_item);
1715
56199016 1716 req->r_stamp = timespec_trunc(current_kernel_time(), mdsc->fsc->sb->s_time_gran);
b8e69066 1717
2f2dc053
SW		 1718 req->r_op = op;
1719 req->r_direct_mode = mode;
1720 return req;
1721}
1722
1723/*
44ca18f2 1724 * return oldest (lowest) request, tid in request tree, 0 if none.
2f2dc053
SW		 1725 *
1726 * called under mdsc->mutex.
1727 */
44ca18f2
SW		 1728static struct ceph_mds_request *__get_oldest_req(struct ceph_mds_client *mdsc)
1729{
1730 if (RB_EMPTY_ROOT(&mdsc->request_tree))
1731 return NULL;
1732 return rb_entry(rb_first(&mdsc->request_tree),
1733 struct ceph_mds_request, r_node);
1734}
1735
e8a7b8b1 1736static inline u64 __get_oldest_tid(struct ceph_mds_client *mdsc)
2f2dc053 1737{
e8a7b8b1 1738 return mdsc->oldest_tid;
2f2dc053
SW		 1739}
1740
1741/*
1742 * Build a dentry's path. Allocate on heap; caller must kfree. Based
1743 * on build_path_from_dentry in fs/cifs/dir.c.
1744 *
1745 * If @stop_on_nosnap, generate path relative to the first non-snapped
1746 * inode.
1747 *
1748 * Encode hidden .snap dirs as a double /, i.e.
1749 * foo/.snap/bar -> foo//bar
1750 */
1751char *ceph_mdsc_build_path(struct dentry *dentry, int *plen, u64 *base,
1752 int stop_on_nosnap)
1753{
1754 struct dentry *temp;
1755 char *path;
1756 int len, pos;
1b71fe2e 1757 unsigned seq;
2f2dc053 1758
d37b1d99 1759 if (!dentry)
2f2dc053
SW		 1760 return ERR_PTR(-EINVAL);
1761
1762retry:
1763 len = 0;
1b71fe2e
AV		 1764 seq = read_seqbegin(&rename_lock);
1765 rcu_read_lock();
2f2dc053 1766 for (temp = dentry; !IS_ROOT(temp);) {
2b0143b5 1767 struct inode *inode = d_inode(temp);
2f2dc053
SW		 1768 if (inode && ceph_snap(inode) == CEPH_SNAPDIR)
1769 len++; /* slash only */
1770 else if (stop_on_nosnap && inode &&
1771 ceph_snap(inode) == CEPH_NOSNAP)
1772 break;
1773 else
1774 len += 1 + temp->d_name.len;
1775 temp = temp->d_parent;
2f2dc053 1776 }
1b71fe2e 1777 rcu_read_unlock();
2f2dc053
SW		 1778 if (len)
1779 len--; /* no leading '/' */
1780
1781 path = kmalloc(len+1, GFP_NOFS);
d37b1d99 1782 if (!path)
2f2dc053
SW		 1783 return ERR_PTR(-ENOMEM);
1784 pos = len;
1785 path[pos] = 0; /* trailing null */
1b71fe2e 1786 rcu_read_lock();
2f2dc053 1787 for (temp = dentry; !IS_ROOT(temp) && pos != 0; ) {
1b71fe2e 1788 struct inode *inode;
2f2dc053 1789
1b71fe2e 1790 spin_lock(&temp->d_lock);
2b0143b5 1791 inode = d_inode(temp);
2f2dc053 1792 if (inode && ceph_snap(inode) == CEPH_SNAPDIR) {
104648ad 1793 dout("build_path path+%d: %p SNAPDIR\n",
2f2dc053
SW		 1794 pos, temp);
1795 } else if (stop_on_nosnap && inode &&
1796 ceph_snap(inode) == CEPH_NOSNAP) {
9d5a09e6 1797 spin_unlock(&temp->d_lock);
2f2dc053
SW		 1798 break;
1799 } else {
1800 pos -= temp->d_name.len;
1b71fe2e
AV		 1801 if (pos < 0) {
1802 spin_unlock(&temp->d_lock);
2f2dc053 1803 break;
1b71fe2e 1804 }
2f2dc053
SW		 1805 strncpy(path + pos, temp->d_name.name,
1806 temp->d_name.len);
2f2dc053 1807 }
1b71fe2e 1808 spin_unlock(&temp->d_lock);
2f2dc053
SW		 1809 if (pos)
1810 path[--pos] = '/';
1811 temp = temp->d_parent;
2f2dc053 1812 }
1b71fe2e
AV		 1813 rcu_read_unlock();
1814 if (pos != 0 || read_seqretry(&rename_lock, seq)) {
104648ad 1815 pr_err("build_path did not end path lookup where "
2f2dc053
SW		 1816 "expected, namelen is %d, pos is %d\n", len, pos);
1817 /* presumably this is only possible if racing with a
1818 rename of one of the parent directories (we can not
1819 lock the dentries above us to prevent this, but
1820 retrying should be harmless) */
1821 kfree(path);
1822 goto retry;
1823 }
1824
2b0143b5 1825 *base = ceph_ino(d_inode(temp));
2f2dc053 1826 *plen = len;
104648ad 1827 dout("build_path on %p %d built %llx '%.*s'\n",
84d08fa8 1828 dentry, d_count(dentry), *base, len, path);
2f2dc053
SW		 1829 return path;
1830}
1831
fd36a717 1832static int build_dentry_path(struct dentry *dentry, struct inode *dir,
2f2dc053
SW		 1833 const char **ppath, int *ppathlen, u64 *pino,
1834 int *pfreepath)
1835{
1836 char *path;
1837
c6b0b656 1838 rcu_read_lock();
fd36a717
JL		 1839 if (!dir)
1840 dir = d_inode_rcu(dentry->d_parent);
c6b0b656
JL		 1841 if (dir && ceph_snap(dir) == CEPH_NOSNAP) {
1842 *pino = ceph_ino(dir);
1843 rcu_read_unlock();
2f2dc053
SW		 1844 *ppath = dentry->d_name.name;
1845 *ppathlen = dentry->d_name.len;
1846 return 0;
1847 }
c6b0b656 1848 rcu_read_unlock();
2f2dc053
SW		 1849 path = ceph_mdsc_build_path(dentry, ppathlen, pino, 1);
1850 if (IS_ERR(path))
1851 return PTR_ERR(path);
1852 *ppath = path;
1853 *pfreepath = 1;
1854 return 0;
1855}
1856
1857static int build_inode_path(struct inode *inode,
1858 const char **ppath, int *ppathlen, u64 *pino,
1859 int *pfreepath)
1860{
1861 struct dentry *dentry;
1862 char *path;
1863
1864 if (ceph_snap(inode) == CEPH_NOSNAP) {
1865 *pino = ceph_ino(inode);
1866 *ppathlen = 0;
1867 return 0;
1868 }
1869 dentry = d_find_alias(inode);
1870 path = ceph_mdsc_build_path(dentry, ppathlen, pino, 1);
1871 dput(dentry);
1872 if (IS_ERR(path))
1873 return PTR_ERR(path);
1874 *ppath = path;
1875 *pfreepath = 1;
1876 return 0;
1877}
1878
1879/*
1880 * request arguments may be specified via an inode *, a dentry *, or
1881 * an explicit ino+path.
1882 */
1883static int set_request_path_attr(struct inode *rinode, struct dentry *rdentry,
fd36a717
JL		 1884 struct inode *rdiri, const char *rpath,
1885 u64 rino, const char **ppath, int *pathlen,
2f2dc053
SW		 1886 u64 *ino, int *freepath)
1887{
1888 int r = 0;
1889
1890 if (rinode) {
1891 r = build_inode_path(rinode, ppath, pathlen, ino, freepath);
1892 dout(" inode %p %llx.%llx\n", rinode, ceph_ino(rinode),
1893 ceph_snap(rinode));
1894 } else if (rdentry) {
fd36a717
JL		 1895 r = build_dentry_path(rdentry, rdiri, ppath, pathlen, ino,
1896 freepath);
2f2dc053
SW		 1897 dout(" dentry %p %llx/%.*s\n", rdentry, *ino, *pathlen,
1898 *ppath);
795858db 1899 } else if (rpath || rino) {
2f2dc053
SW		 1900 *ino = rino;
1901 *ppath = rpath;
b000056a 1902 *pathlen = rpath ? strlen(rpath) : 0;
2f2dc053
SW		 1903 dout(" path %.*s\n", *pathlen, rpath);
1904 }
1905
1906 return r;
1907}
1908
1909/*
1910 * called under mdsc->mutex
1911 */
1912static struct ceph_msg *create_request_message(struct ceph_mds_client *mdsc,
1913 struct ceph_mds_request *req,
6e6f0923 1914 int mds, bool drop_cap_releases)
2f2dc053
SW		 1915{
1916 struct ceph_msg *msg;
1917 struct ceph_mds_request_head *head;
1918 const char *path1 = NULL;
1919 const char *path2 = NULL;
1920 u64 ino1 = 0, ino2 = 0;
1921 int pathlen1 = 0, pathlen2 = 0;
1922 int freepath1 = 0, freepath2 = 0;
1923 int len;
1924 u16 releases;
1925 void *p, *end;
1926 int ret;
1927
1928 ret = set_request_path_attr(req->r_inode, req->r_dentry,
3dd69aab 1929 req->r_parent, req->r_path1, req->r_ino1.ino,
2f2dc053
SW		 1930 &path1, &pathlen1, &ino1, &freepath1);
1931 if (ret < 0) {
1932 msg = ERR_PTR(ret);
1933 goto out;
1934 }
1935
1936 ret = set_request_path_attr(NULL, req->r_old_dentry,
fd36a717 1937 req->r_old_dentry_dir,
2f2dc053
SW		 1938 req->r_path2, req->r_ino2.ino,
1939 &path2, &pathlen2, &ino2, &freepath2);
1940 if (ret < 0) {
1941 msg = ERR_PTR(ret);
1942 goto out_free1;
1943 }
1944
1945 len = sizeof(*head) +
b8e69066 1946 pathlen1 + pathlen2 + 2*(1 + sizeof(u32) + sizeof(u64)) +
777d738a 1947 sizeof(struct ceph_timespec);
2f2dc053
SW		 1948
1949 /* calculate (max) length for cap releases */
1950 len += sizeof(struct ceph_mds_request_release) *
1951 (!!req->r_inode_drop + !!req->r_dentry_drop +
1952 !!req->r_old_inode_drop + !!req->r_old_dentry_drop);
1953 if (req->r_dentry_drop)
1954 len += req->r_dentry->d_name.len;
1955 if (req->r_old_dentry_drop)
1956 len += req->r_old_dentry->d_name.len;
1957
b61c2763 1958 msg = ceph_msg_new(CEPH_MSG_CLIENT_REQUEST, len, GFP_NOFS, false);
a79832f2
SW		 1959 if (!msg) {
1960 msg = ERR_PTR(-ENOMEM);
2f2dc053 1961 goto out_free2;
a79832f2 1962 }
2f2dc053 1963
7cfa0313 1964 msg->hdr.version = cpu_to_le16(2);
6df058c0
SW		 1965 msg->hdr.tid = cpu_to_le64(req->r_tid);
1966
2f2dc053
SW		 1967 head = msg->front.iov_base;
1968 p = msg->front.iov_base + sizeof(*head);
1969 end = msg->front.iov_base + msg->front.iov_len;
1970
1971 head->mdsmap_epoch = cpu_to_le32(mdsc->mdsmap->m_epoch);
1972 head->op = cpu_to_le32(req->r_op);
ff3d0046
EB		 1973 head->caller_uid = cpu_to_le32(from_kuid(&init_user_ns, req->r_uid));
1974 head->caller_gid = cpu_to_le32(from_kgid(&init_user_ns, req->r_gid));
2f2dc053
SW		 1975 head->args = req->r_args;
1976
1977 ceph_encode_filepath(&p, end, ino1, path1);
1978 ceph_encode_filepath(&p, end, ino2, path2);
1979
e979cf50
SW		 1980 /* make note of release offset, in case we need to replay */
1981 req->r_request_release_offset = p - msg->front.iov_base;
1982
2f2dc053
SW		 1983 /* cap releases */
1984 releases = 0;
1985 if (req->r_inode_drop)
1986 releases += ceph_encode_inode_release(&p,
2b0143b5 1987 req->r_inode ? req->r_inode : d_inode(req->r_dentry),
2f2dc053
SW		 1988 mds, req->r_inode_drop, req->r_inode_unless, 0);
1989 if (req->r_dentry_drop)
1990 releases += ceph_encode_dentry_release(&p, req->r_dentry,
3dd69aab 1991 req->r_parent, mds, req->r_dentry_drop,
ca6c8ae0 1992 req->r_dentry_unless);
2f2dc053
SW		 1993 if (req->r_old_dentry_drop)
1994 releases += ceph_encode_dentry_release(&p, req->r_old_dentry,
ca6c8ae0
JL		 1995 req->r_old_dentry_dir, mds,
1996 req->r_old_dentry_drop,
1997 req->r_old_dentry_unless);
2f2dc053
SW		 1998 if (req->r_old_inode_drop)
1999 releases += ceph_encode_inode_release(&p,
2b0143b5 2000 d_inode(req->r_old_dentry),
2f2dc053 2001 mds, req->r_old_inode_drop, req->r_old_inode_unless, 0);
6e6f0923
YZ		 2002
2003 if (drop_cap_releases) {
2004 releases = 0;
2005 p = msg->front.iov_base + req->r_request_release_offset;
2006 }
2007
2f2dc053
SW		 2008 head->num_releases = cpu_to_le16(releases);
2009
b8e69066 2010 /* time stamp */
1f041a89
YZ		 2011 {
2012 struct ceph_timespec ts;
2013 ceph_encode_timespec(&ts, &req->r_stamp);
2014 ceph_encode_copy(&p, &ts, sizeof(ts));
2015 }
b8e69066 2016
2f2dc053
SW		 2017 BUG_ON(p > end);
2018 msg->front.iov_len = p - msg->front.iov_base;
2019 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
2020
25e6bae3
YZ		 2021 if (req->r_pagelist) {
2022 struct ceph_pagelist *pagelist = req->r_pagelist;
0e1a5ee6 2023 refcount_inc(&pagelist->refcnt);
25e6bae3
YZ		 2024 ceph_msg_data_add_pagelist(msg, pagelist);
2025 msg->hdr.data_len = cpu_to_le32(pagelist->length);
2026 } else {
2027 msg->hdr.data_len = 0;
ebf18f47 2028 }
02afca6c 2029
2f2dc053
SW		 2030 msg->hdr.data_off = cpu_to_le16(0);
2031
2032out_free2:
2033 if (freepath2)
2034 kfree((char *)path2);
2035out_free1:
2036 if (freepath1)
2037 kfree((char *)path1);
2038out:
2039 return msg;
2040}
2041
2042/*
2043 * called under mdsc->mutex if error, under no mutex if
2044 * success.
2045 */
2046static void complete_request(struct ceph_mds_client *mdsc,
2047 struct ceph_mds_request *req)
2048{
2049 if (req->r_callback)
2050 req->r_callback(mdsc, req);
2051 else
03066f23 2052 complete_all(&req->r_completion);
2f2dc053
SW		 2053}
2054
2055/*
2056 * called under mdsc->mutex
2057 */
2058static int __prepare_send_request(struct ceph_mds_client *mdsc,
2059 struct ceph_mds_request *req,
6e6f0923 2060 int mds, bool drop_cap_releases)
2f2dc053
SW		 2061{
2062 struct ceph_mds_request_head *rhead;
2063 struct ceph_msg *msg;
2064 int flags = 0;
2065
2f2dc053 2066 req->r_attempts++;
e55b71f8
GF		 2067 if (req->r_inode) {
2068 struct ceph_cap *cap =
2069 ceph_get_cap_for_mds(ceph_inode(req->r_inode), mds);
2070
2071 if (cap)
2072 req->r_sent_on_mseq = cap->mseq;
2073 else
2074 req->r_sent_on_mseq = -1;
2075 }
2f2dc053
SW		 2076 dout("prepare_send_request %p tid %lld %s (attempt %d)\n", req,
2077 req->r_tid, ceph_mds_op_name(req->r_op), req->r_attempts);
2078
bc2de10d 2079 if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) {
c5c9a0bf 2080 void *p;
01a92f17
SW		 2081 /*
2082 * Replay. Do not regenerate message (and rebuild
2083 * paths, etc.); just use the original message.
2084 * Rebuilding paths will break for renames because
2085 * d_move mangles the src name.
2086 */
2087 msg = req->r_request;
2088 rhead = msg->front.iov_base;
2089
2090 flags = le32_to_cpu(rhead->flags);
2091 flags |= CEPH_MDS_FLAG_REPLAY;
2092 rhead->flags = cpu_to_le32(flags);
2093
2094 if (req->r_target_inode)
2095 rhead->ino = cpu_to_le64(ceph_ino(req->r_target_inode));
2096
2097 rhead->num_retry = req->r_attempts - 1;
e979cf50
SW		 2098
2099 /* remove cap/dentry releases from message */
2100 rhead->num_releases = 0;
c5c9a0bf
YZ		 2101
2102 /* time stamp */
2103 p = msg->front.iov_base + req->r_request_release_offset;
1f041a89
YZ		 2104 {
2105 struct ceph_timespec ts;
2106 ceph_encode_timespec(&ts, &req->r_stamp);
2107 ceph_encode_copy(&p, &ts, sizeof(ts));
2108 }
c5c9a0bf
YZ		 2109
2110 msg->front.iov_len = p - msg->front.iov_base;
2111 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
01a92f17
SW		 2112 return 0;
2113 }
2114
2f2dc053
SW		 2115 if (req->r_request) {
2116 ceph_msg_put(req->r_request);
2117 req->r_request = NULL;
2118 }
6e6f0923 2119 msg = create_request_message(mdsc, req, mds, drop_cap_releases);
2f2dc053 2120 if (IS_ERR(msg)) {
e1518c7c 2121 req->r_err = PTR_ERR(msg);
a79832f2 2122 return PTR_ERR(msg);
2f2dc053
SW		 2123 }
2124 req->r_request = msg;
2125
2126 rhead = msg->front.iov_base;
2f2dc053 2127 rhead->oldest_client_tid = cpu_to_le64(__get_oldest_tid(mdsc));
bc2de10d 2128 if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags))
2f2dc053 2129 flags |= CEPH_MDS_FLAG_REPLAY;
3dd69aab 2130 if (req->r_parent)
2f2dc053
SW		 2131 flags |= CEPH_MDS_FLAG_WANT_DENTRY;
2132 rhead->flags = cpu_to_le32(flags);
2133 rhead->num_fwd = req->r_num_fwd;
2134 rhead->num_retry = req->r_attempts - 1;
01a92f17 2135 rhead->ino = 0;
2f2dc053 2136
3dd69aab 2137 dout(" r_parent = %p\n", req->r_parent);
2f2dc053
SW		 2138 return 0;
2139}
2140
2141/*
2142 * send request, or put it on the appropriate wait list.
2143 */
2144static int __do_request(struct ceph_mds_client *mdsc,
2145 struct ceph_mds_request *req)
2146{
2147 struct ceph_mds_session *session = NULL;
2148 int mds = -1;
48fec5d0 2149 int err = 0;
2f2dc053 2150
bc2de10d
JL		 2151 if (req->r_err || test_bit(CEPH_MDS_R_GOT_RESULT, &req->r_req_flags)) {
2152 if (test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags))
eb1b8af3 2153 __unregister_request(mdsc, req);
2f2dc053 2154 goto out;
eb1b8af3 2155 }
2f2dc053
SW		 2156
2157 if (req->r_timeout &&
2158 time_after_eq(jiffies, req->r_started + req->r_timeout)) {
2159 dout("do_request timed out\n");
2160 err = -EIO;
2161 goto finish;
2162 }
52953d55 2163 if (READ_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_SHUTDOWN) {
48fec5d0
YZ		 2164 dout("do_request forced umount\n");
2165 err = -EIO;
2166 goto finish;
2167 }
52953d55 2168 if (READ_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_MOUNTING) {
e9e427f0
YZ		 2169 if (mdsc->mdsmap_err) {
2170 err = mdsc->mdsmap_err;
2171 dout("do_request mdsmap err %d\n", err);
2172 goto finish;
2173 }
cc8e8342
YZ		 2174 if (mdsc->mdsmap->m_epoch == 0) {
2175 dout("do_request no mdsmap, waiting for map\n");
2176 list_add(&req->r_wait, &mdsc->waiting_for_map);
2177 goto finish;
2178 }
e9e427f0
YZ		 2179 if (!(mdsc->fsc->mount_options->flags &
2180 CEPH_MOUNT_OPT_MOUNTWAIT) &&
2181 !ceph_mdsmap_is_cluster_available(mdsc->mdsmap)) {
2182 err = -ENOENT;
2183 pr_info("probably no mds server is up\n");
2184 goto finish;
2185 }
2186 }
2f2dc053 2187
dc69e2e9
SW		 2188 put_request_session(req);
2189
2f2dc053
SW		 2190 mds = __choose_mds(mdsc, req);
2191 if (mds < 0 ||
2192 ceph_mdsmap_get_state(mdsc->mdsmap, mds) < CEPH_MDS_STATE_ACTIVE) {
2193 dout("do_request no mds or not active, waiting for map\n");
2194 list_add(&req->r_wait, &mdsc->waiting_for_map);
2195 goto out;
2196 }
2197
2198 /* get, open session */
2199 session = __ceph_lookup_mds_session(mdsc, mds);
9c423956 2200 if (!session) {
2f2dc053 2201 session = register_session(mdsc, mds);
9c423956
SW		 2202 if (IS_ERR(session)) {
2203 err = PTR_ERR(session);
2204 goto finish;
2205 }
2206 }
dc69e2e9
SW		 2207 req->r_session = get_session(session);
2208
2f2dc053 2209 dout("do_request mds%d session %p state %s\n", mds, session,
a687ecaf 2210 ceph_session_state_name(session->s_state));
2f2dc053
SW		 2211 if (session->s_state != CEPH_MDS_SESSION_OPEN &&
2212 session->s_state != CEPH_MDS_SESSION_HUNG) {
fcff415c
YZ		 2213 if (session->s_state == CEPH_MDS_SESSION_REJECTED) {
2214 err = -EACCES;
2215 goto out_session;
2216 }
2f2dc053
SW		 2217 if (session->s_state == CEPH_MDS_SESSION_NEW ||
2218 session->s_state == CEPH_MDS_SESSION_CLOSING)
2219 __open_session(mdsc, session);
2220 list_add(&req->r_wait, &session->s_waiting);
2221 goto out_session;
2222 }
2223
2224 /* send request */
2f2dc053
SW		 2225 req->r_resend_mds = -1; /* forget any previous mds hint */
2226
2227 if (req->r_request_started == 0) /* note request start time */
2228 req->r_request_started = jiffies;
2229
6e6f0923 2230 err = __prepare_send_request(mdsc, req, mds, false);
2f2dc053
SW		 2231 if (!err) {
2232 ceph_msg_get(req->r_request);
2233 ceph_con_send(&session->s_con, req->r_request);
2234 }
2235
2236out_session:
2237 ceph_put_mds_session(session);
48fec5d0
YZ		 2238finish:
2239 if (err) {
2240 dout("__do_request early error %d\n", err);
2241 req->r_err = err;
2242 complete_request(mdsc, req);
2243 __unregister_request(mdsc, req);
2244 }
2f2dc053
SW		 2245out:
2246 return err;
2f2dc053
SW		 2247}
2248
2249/*
2250 * called under mdsc->mutex
2251 */
2252static void __wake_requests(struct ceph_mds_client *mdsc,
2253 struct list_head *head)
2254{
ed75ec2c
YZ		 2255 struct ceph_mds_request *req;
2256 LIST_HEAD(tmp_list);
2257
2258 list_splice_init(head, &tmp_list);
2f2dc053 2259
ed75ec2c
YZ		 2260 while (!list_empty(&tmp_list)) {
2261 req = list_entry(tmp_list.next,
2262 struct ceph_mds_request, r_wait);
2f2dc053 2263 list_del_init(&req->r_wait);
7971bd92 2264 dout(" wake request %p tid %llu\n", req, req->r_tid);
2f2dc053
SW		 2265 __do_request(mdsc, req);
2266 }
2267}
2268
2269/*
2270 * Wake up threads with requests pending for @mds, so that they can
29790f26 2271 * resubmit their requests to a possibly different mds.
2f2dc053 2272 */
29790f26 2273static void kick_requests(struct ceph_mds_client *mdsc, int mds)
2f2dc053 2274{
44ca18f2 2275 struct ceph_mds_request *req;
282c1052 2276 struct rb_node *p = rb_first(&mdsc->request_tree);
2f2dc053
SW		 2277
2278 dout("kick_requests mds%d\n", mds);
282c1052 2279 while (p) {
44ca18f2 2280 req = rb_entry(p, struct ceph_mds_request, r_node);
282c1052 2281 p = rb_next(p);
bc2de10d 2282 if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags))
44ca18f2 2283 continue;
3de22be6
YZ		 2284 if (req->r_attempts > 0)
2285 continue; /* only new requests */
44ca18f2
SW		 2286 if (req->r_session &&
2287 req->r_session->s_mds == mds) {
2288 dout(" kicking tid %llu\n", req->r_tid);
03974e81 2289 list_del_init(&req->r_wait);
44ca18f2 2290 __do_request(mdsc, req);
2f2dc053
SW		 2291 }
2292 }
2293}
2294
2295void ceph_mdsc_submit_request(struct ceph_mds_client *mdsc,
2296 struct ceph_mds_request *req)
2297{
2298 dout("submit_request on %p\n", req);
2299 mutex_lock(&mdsc->mutex);
2300 __register_request(mdsc, req, NULL);
2301 __do_request(mdsc, req);
2302 mutex_unlock(&mdsc->mutex);
2303}
2304
2305/*
2306 * Synchrously perform an mds request. Take care of all of the
2307 * session setup, forwarding, retry details.
2308 */
2309int ceph_mdsc_do_request(struct ceph_mds_client *mdsc,
2310 struct inode *dir,
2311 struct ceph_mds_request *req)
2312{
2313 int err;
2314
2315 dout("do_request on %p\n", req);
2316
3dd69aab 2317 /* take CAP_PIN refs for r_inode, r_parent, r_old_dentry */
2f2dc053
SW		 2318 if (req->r_inode)
2319 ceph_get_cap_refs(ceph_inode(req->r_inode), CEPH_CAP_PIN);
3dd69aab
JL		 2320 if (req->r_parent)
2321 ceph_get_cap_refs(ceph_inode(req->r_parent), CEPH_CAP_PIN);
844d87c3 2322 if (req->r_old_dentry_dir)
41b02e1f
SW		 2323 ceph_get_cap_refs(ceph_inode(req->r_old_dentry_dir),
2324 CEPH_CAP_PIN);
2f2dc053
SW		 2325
2326 /* issue */
2327 mutex_lock(&mdsc->mutex);
2328 __register_request(mdsc, req, dir);
2329 __do_request(mdsc, req);
2330
e1518c7c
SW		 2331 if (req->r_err) {
2332 err = req->r_err;
e1518c7c 2333 goto out;
2f2dc053
SW		 2334 }
2335
e1518c7c
SW		 2336 /* wait */
2337 mutex_unlock(&mdsc->mutex);
2338 dout("do_request waiting\n");
5be73034 2339 if (!req->r_timeout && req->r_wait_for_completion) {
9280be24 2340 err = req->r_wait_for_completion(mdsc, req);
e1518c7c 2341 } else {
5be73034
ID		 2342 long timeleft = wait_for_completion_killable_timeout(
2343 &req->r_completion,
2344 ceph_timeout_jiffies(req->r_timeout));
2345 if (timeleft > 0)
2346 err = 0;
2347 else if (!timeleft)
2348 err = -EIO; /* timed out */
2349 else
2350 err = timeleft; /* killed */
e1518c7c
SW		 2351 }
2352 dout("do_request waited, got %d\n", err);
2353 mutex_lock(&mdsc->mutex);
5b1daecd 2354
e1518c7c 2355 /* only abort if we didn't race with a real reply */
bc2de10d 2356 if (test_bit(CEPH_MDS_R_GOT_RESULT, &req->r_req_flags)) {
e1518c7c
SW		 2357 err = le32_to_cpu(req->r_reply_info.head->result);
2358 } else if (err < 0) {
2359 dout("aborted request %lld with %d\n", req->r_tid, err);
b4556396
SW		 2360
2361 /*
2362 * ensure we aren't running concurrently with
2363 * ceph_fill_trace or ceph_readdir_prepopulate, which
2364 * rely on locks (dir mutex) held by our caller.
2365 */
2366 mutex_lock(&req->r_fill_mutex);
e1518c7c 2367 req->r_err = err;
bc2de10d 2368 set_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags);
b4556396 2369 mutex_unlock(&req->r_fill_mutex);
5b1daecd 2370
3dd69aab 2371 if (req->r_parent &&
167c9e35
SW		 2372 (req->r_op & CEPH_MDS_OP_WRITE))
2373 ceph_invalidate_dir_request(req);
2f2dc053 2374 } else {
e1518c7c 2375 err = req->r_err;
2f2dc053 2376 }
2f2dc053 2377
e1518c7c
SW		 2378out:
2379 mutex_unlock(&mdsc->mutex);
2f2dc053
SW		 2380 dout("do_request %p done, result %d\n", req, err);
2381 return err;
2382}
2383
167c9e35 2384/*
2f276c51 2385 * Invalidate dir's completeness, dentry lease state on an aborted MDS
167c9e35
SW		 2386 * namespace request.
2387 */
2388void ceph_invalidate_dir_request(struct ceph_mds_request *req)
2389{
3dd69aab 2390 struct inode *inode = req->r_parent;
167c9e35 2391
2f276c51 2392 dout("invalidate_dir_request %p (complete, lease(s))\n", inode);
167c9e35 2393
2f276c51 2394 ceph_dir_clear_complete(inode);
167c9e35
SW		 2395 if (req->r_dentry)
2396 ceph_invalidate_dentry_lease(req->r_dentry);
2397 if (req->r_old_dentry)
2398 ceph_invalidate_dentry_lease(req->r_old_dentry);
2399}
2400
2f2dc053
SW		 2401/*
2402 * Handle mds reply.
2403 *
2404 * We take the session mutex and parse and process the reply immediately.
2405 * This preserves the logical ordering of replies, capabilities, etc., sent
2406 * by the MDS as they are applied to our local cache.
2407 */
2408static void handle_reply(struct ceph_mds_session *session, struct ceph_msg *msg)
2409{
2410 struct ceph_mds_client *mdsc = session->s_mdsc;
2411 struct ceph_mds_request *req;
2412 struct ceph_mds_reply_head *head = msg->front.iov_base;
2413 struct ceph_mds_reply_info_parsed *rinfo; /* parsed reply info */
982d6011 2414 struct ceph_snap_realm *realm;
2f2dc053
SW		 2415 u64 tid;
2416 int err, result;
2600d2dd 2417 int mds = session->s_mds;
2f2dc053 2418
2f2dc053
SW		 2419 if (msg->front.iov_len < sizeof(*head)) {
2420 pr_err("mdsc_handle_reply got corrupt (short) reply\n");
9ec7cab1 2421 ceph_msg_dump(msg);
2f2dc053
SW		 2422 return;
2423 }
2424
2425 /* get request, session */
6df058c0 2426 tid = le64_to_cpu(msg->hdr.tid);
2f2dc053 2427 mutex_lock(&mdsc->mutex);
fcd00b68 2428 req = lookup_get_request(mdsc, tid);
2f2dc053
SW		 2429 if (!req) {
2430 dout("handle_reply on unknown tid %llu\n", tid);
2431 mutex_unlock(&mdsc->mutex);
2432 return;
2433 }
2434 dout("handle_reply %p\n", req);
2f2dc053
SW		 2435
2436 /* correct session? */
d96d6049 2437 if (req->r_session != session) {
2f2dc053
SW		 2438 pr_err("mdsc_handle_reply got %llu on session mds%d"
2439 " not mds%d\n", tid, session->s_mds,
2440 req->r_session ? req->r_session->s_mds : -1);
2441 mutex_unlock(&mdsc->mutex);
2442 goto out;
2443 }
2444
2445 /* dup? */
bc2de10d
JL		 2446 if ((test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags) && !head->safe) ||
2447 (test_bit(CEPH_MDS_R_GOT_SAFE, &req->r_req_flags) && head->safe)) {
f3ae1b97 2448 pr_warn("got a dup %s reply on %llu from mds%d\n",
2f2dc053
SW		 2449 head->safe ? "safe" : "unsafe", tid, mds);
2450 mutex_unlock(&mdsc->mutex);
2451 goto out;
2452 }
bc2de10d 2453 if (test_bit(CEPH_MDS_R_GOT_SAFE, &req->r_req_flags)) {
f3ae1b97 2454 pr_warn("got unsafe after safe on %llu from mds%d\n",
85792d0d
SW		 2455 tid, mds);
2456 mutex_unlock(&mdsc->mutex);
2457 goto out;
2458 }
2f2dc053
SW		 2459
2460 result = le32_to_cpu(head->result);
2461
2462 /*
e55b71f8
GF		 2463 * Handle an ESTALE
2464 * if we're not talking to the authority, send to them
2465 * if the authority has changed while we weren't looking,
2466 * send to new authority
2467 * Otherwise we just have to return an ESTALE
2f2dc053
SW		 2468 */
2469 if (result == -ESTALE) {
e55b71f8 2470 dout("got ESTALE on request %llu", req->r_tid);
51da8e8c 2471 req->r_resend_mds = -1;
ca18bede 2472 if (req->r_direct_mode != USE_AUTH_MDS) {
e55b71f8
GF		 2473 dout("not using auth, setting for that now");
2474 req->r_direct_mode = USE_AUTH_MDS;
2f2dc053
SW		 2475 __do_request(mdsc, req);
2476 mutex_unlock(&mdsc->mutex);
2477 goto out;
e55b71f8 2478 } else {
ca18bede
YZ		 2479 int mds = __choose_mds(mdsc, req);
2480 if (mds >= 0 && mds != req->r_session->s_mds) {
2481 dout("but auth changed, so resending");
e55b71f8
GF		 2482 __do_request(mdsc, req);
2483 mutex_unlock(&mdsc->mutex);
2484 goto out;
2485 }
2f2dc053 2486 }
e55b71f8 2487 dout("have to return ESTALE on request %llu", req->r_tid);
2f2dc053
SW		 2488 }
2489
e55b71f8 2490
2f2dc053 2491 if (head->safe) {
bc2de10d 2492 set_bit(CEPH_MDS_R_GOT_SAFE, &req->r_req_flags);
2f2dc053 2493 __unregister_request(mdsc, req);
2f2dc053 2494
bc2de10d 2495 if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) {
2f2dc053
SW		 2496 /*
2497 * We already handled the unsafe response, now do the
2498 * cleanup. No need to examine the response; the MDS
2499 * doesn't include any result info in the safe
2500 * response. And even if it did, there is nothing
2501 * useful we could do with a revised return value.
2502 */
2503 dout("got safe reply %llu, mds%d\n", tid, mds);
2f2dc053
SW		 2504
2505 /* last unsafe request during umount? */
44ca18f2 2506 if (mdsc->stopping && !__get_oldest_req(mdsc))
03066f23 2507 complete_all(&mdsc->safe_umount_waiters);
2f2dc053
SW		 2508 mutex_unlock(&mdsc->mutex);
2509 goto out;
2510 }
e1518c7c 2511 } else {
bc2de10d 2512 set_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags);
2f2dc053 2513 list_add_tail(&req->r_unsafe_item, &req->r_session->s_unsafe);
4c06ace8
YZ		 2514 if (req->r_unsafe_dir) {
2515 struct ceph_inode_info *ci =
2516 ceph_inode(req->r_unsafe_dir);
2517 spin_lock(&ci->i_unsafe_lock);
2518 list_add_tail(&req->r_unsafe_dir_item,
2519 &ci->i_unsafe_dirops);
2520 spin_unlock(&ci->i_unsafe_lock);
2521 }
2f2dc053
SW		 2522 }
2523
2524 dout("handle_reply tid %lld result %d\n", tid, result);
2525 rinfo = &req->r_reply_info;
14303d20 2526 err = parse_reply_info(msg, rinfo, session->s_con.peer_features);
2f2dc053
SW		 2527 mutex_unlock(&mdsc->mutex);
2528
2529 mutex_lock(&session->s_mutex);
2530 if (err < 0) {
25933abd 2531 pr_err("mdsc_handle_reply got corrupt reply mds%d(tid:%lld)\n", mds, tid);
9ec7cab1 2532 ceph_msg_dump(msg);
2f2dc053
SW		 2533 goto out_err;
2534 }
2535
2536 /* snap trace */
982d6011 2537 realm = NULL;
2f2dc053
SW		 2538 if (rinfo->snapblob_len) {
2539 down_write(&mdsc->snap_rwsem);
2540 ceph_update_snap_trace(mdsc, rinfo->snapblob,
982d6011
YZ		 2541 rinfo->snapblob + rinfo->snapblob_len,
2542 le32_to_cpu(head->op) == CEPH_MDS_OP_RMSNAP,
2543 &realm);
2f2dc053
SW		 2544 downgrade_write(&mdsc->snap_rwsem);
2545 } else {
2546 down_read(&mdsc->snap_rwsem);
2547 }
2548
2549 /* insert trace into our cache */
b4556396 2550 mutex_lock(&req->r_fill_mutex);
315f2408 2551 current->journal_info = req;
f5a03b08 2552 err = ceph_fill_trace(mdsc->fsc->sb, req);
2f2dc053 2553 if (err == 0) {
6e8575fa 2554 if (result == 0 && (req->r_op == CEPH_MDS_OP_READDIR ||
81c6aea5 2555 req->r_op == CEPH_MDS_OP_LSSNAP))
2f2dc053 2556 ceph_readdir_prepopulate(req, req->r_session);
37151668 2557 ceph_unreserve_caps(mdsc, &req->r_caps_reservation);
2f2dc053 2558 }
315f2408 2559 current->journal_info = NULL;
b4556396 2560 mutex_unlock(&req->r_fill_mutex);
2f2dc053
SW		 2561
2562 up_read(&mdsc->snap_rwsem);
982d6011
YZ		 2563 if (realm)
2564 ceph_put_snap_realm(mdsc, realm);
68cd5b4b 2565
bc2de10d
JL		 2566 if (err == 0 && req->r_target_inode &&
2567 test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) {
68cd5b4b
YZ		 2568 struct ceph_inode_info *ci = ceph_inode(req->r_target_inode);
2569 spin_lock(&ci->i_unsafe_lock);
2570 list_add_tail(&req->r_unsafe_target_item, &ci->i_unsafe_iops);
2571 spin_unlock(&ci->i_unsafe_lock);
2572 }
2f2dc053 2573out_err:
e1518c7c 2574 mutex_lock(&mdsc->mutex);
bc2de10d 2575 if (!test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags)) {
e1518c7c
SW		 2576 if (err) {
2577 req->r_err = err;
2578 } else {
5fdb1389 2579 req->r_reply = ceph_msg_get(msg);
bc2de10d 2580 set_bit(CEPH_MDS_R_GOT_RESULT, &req->r_req_flags);
e1518c7c 2581 }
2f2dc053 2582 } else {
e1518c7c 2583 dout("reply arrived after request %lld was aborted\n", tid);
2f2dc053 2584 }
e1518c7c 2585 mutex_unlock(&mdsc->mutex);
2f2dc053 2586
2f2dc053
SW		 2587 mutex_unlock(&session->s_mutex);
2588
2589 /* kick calling process */
2590 complete_request(mdsc, req);
2591out:
2592 ceph_mdsc_put_request(req);
2593 return;
2594}
2595
2596
2597
2598/*
2599 * handle mds notification that our request has been forwarded.
2600 */
2600d2dd
SW		 2601static void handle_forward(struct ceph_mds_client *mdsc,
2602 struct ceph_mds_session *session,
2603 struct ceph_msg *msg)
2f2dc053
SW		 2604{
2605 struct ceph_mds_request *req;
a1ea787c 2606 u64 tid = le64_to_cpu(msg->hdr.tid);
2f2dc053
SW		 2607 u32 next_mds;
2608 u32 fwd_seq;
2f2dc053
SW		 2609 int err = -EINVAL;
2610 void *p = msg->front.iov_base;
2611 void *end = p + msg->front.iov_len;
2f2dc053 2612
a1ea787c 2613 ceph_decode_need(&p, end, 2*sizeof(u32), bad);
c89136ea
SW		 2614 next_mds = ceph_decode_32(&p);
2615 fwd_seq = ceph_decode_32(&p);
2f2dc053
SW		 2616
2617 mutex_lock(&mdsc->mutex);
fcd00b68 2618 req = lookup_get_request(mdsc, tid);
2f2dc053 2619 if (!req) {
2a8e5e36 2620 dout("forward tid %llu to mds%d - req dne\n", tid, next_mds);
2f2dc053
SW		 2621 goto out; /* dup reply? */
2622 }
2623
bc2de10d 2624 if (test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags)) {
2a8e5e36
SW		 2625 dout("forward tid %llu aborted, unregistering\n", tid);
2626 __unregister_request(mdsc, req);
2627 } else if (fwd_seq <= req->r_num_fwd) {
2628 dout("forward tid %llu to mds%d - old seq %d <= %d\n",
2f2dc053
SW		 2629 tid, next_mds, req->r_num_fwd, fwd_seq);
2630 } else {
2631 /* resend. forward race not possible; mds would drop */
2a8e5e36
SW		 2632 dout("forward tid %llu to mds%d (we resend)\n", tid, next_mds);
2633 BUG_ON(req->r_err);
bc2de10d 2634 BUG_ON(test_bit(CEPH_MDS_R_GOT_RESULT, &req->r_req_flags));
3de22be6 2635 req->r_attempts = 0;
2f2dc053
SW		 2636 req->r_num_fwd = fwd_seq;
2637 req->r_resend_mds = next_mds;
2638 put_request_session(req);
2639 __do_request(mdsc, req);
2640 }
2641 ceph_mdsc_put_request(req);
2642out:
2643 mutex_unlock(&mdsc->mutex);
2644 return;
2645
2646bad:
2647 pr_err("mdsc_handle_forward decode error err=%d\n", err);
2648}
2649
2650/*
2651 * handle a mds session control message
2652 */
2653static void handle_session(struct ceph_mds_session *session,
2654 struct ceph_msg *msg)
2655{
2656 struct ceph_mds_client *mdsc = session->s_mdsc;
2657 u32 op;
2658 u64 seq;
2600d2dd 2659 int mds = session->s_mds;
2f2dc053
SW		 2660 struct ceph_mds_session_head *h = msg->front.iov_base;
2661 int wake = 0;
2662
2f2dc053
SW		 2663 /* decode */
2664 if (msg->front.iov_len != sizeof(*h))
2665 goto bad;
2666 op = le32_to_cpu(h->op);
2667 seq = le64_to_cpu(h->seq);
2668
2669 mutex_lock(&mdsc->mutex);
0a07fc8c
YZ		 2670 if (op == CEPH_SESSION_CLOSE) {
2671 get_session(session);
2600d2dd 2672 __unregister_session(mdsc, session);
0a07fc8c 2673 }
2f2dc053
SW		 2674 /* FIXME: this ttl calculation is generous */
2675 session->s_ttl = jiffies + HZ*mdsc->mdsmap->m_session_autoclose;
2676 mutex_unlock(&mdsc->mutex);
2677
2678 mutex_lock(&session->s_mutex);
2679
2680 dout("handle_session mds%d %s %p state %s seq %llu\n",
2681 mds, ceph_session_op_name(op), session,
a687ecaf 2682 ceph_session_state_name(session->s_state), seq);
2f2dc053
SW		 2683
2684 if (session->s_state == CEPH_MDS_SESSION_HUNG) {
2685 session->s_state = CEPH_MDS_SESSION_OPEN;
2686 pr_info("mds%d came back\n", session->s_mds);
2687 }
2688
2689 switch (op) {
2690 case CEPH_SESSION_OPEN:
29790f26
SW		 2691 if (session->s_state == CEPH_MDS_SESSION_RECONNECTING)
2692 pr_info("mds%d reconnect success\n", session->s_mds);
2f2dc053
SW		 2693 session->s_state = CEPH_MDS_SESSION_OPEN;
2694 renewed_caps(mdsc, session, 0);
2695 wake = 1;
2696 if (mdsc->stopping)
2697 __close_session(mdsc, session);
2698 break;
2699
2700 case CEPH_SESSION_RENEWCAPS:
2701 if (session->s_renew_seq == seq)
2702 renewed_caps(mdsc, session, 1);
2703 break;
2704
2705 case CEPH_SESSION_CLOSE:
29790f26
SW		 2706 if (session->s_state == CEPH_MDS_SESSION_RECONNECTING)
2707 pr_info("mds%d reconnect denied\n", session->s_mds);
1c841a96 2708 cleanup_session_requests(mdsc, session);
2f2dc053 2709 remove_session_caps(session);
656e4382 2710 wake = 2; /* for good measure */
f3c60c59 2711 wake_up_all(&mdsc->session_close_wq);
2f2dc053
SW		 2712 break;
2713
2714 case CEPH_SESSION_STALE:
2715 pr_info("mds%d caps went stale, renewing\n",
2716 session->s_mds);
d8fb02ab 2717 spin_lock(&session->s_gen_ttl_lock);
2f2dc053 2718 session->s_cap_gen++;
1ce208a6 2719 session->s_cap_ttl = jiffies - 1;
d8fb02ab 2720 spin_unlock(&session->s_gen_ttl_lock);
2f2dc053
SW		 2721 send_renew_caps(mdsc, session);
2722 break;
2723
2724 case CEPH_SESSION_RECALL_STATE:
2725 trim_caps(mdsc, session, le32_to_cpu(h->max_caps));
2726 break;
2727
186e4f7a
YZ		 2728 case CEPH_SESSION_FLUSHMSG:
2729 send_flushmsg_ack(mdsc, session, seq);
2730 break;
2731
03f4fcb0
YZ		 2732 case CEPH_SESSION_FORCE_RO:
2733 dout("force_session_readonly %p\n", session);
2734 spin_lock(&session->s_cap_lock);
2735 session->s_readonly = true;
2736 spin_unlock(&session->s_cap_lock);
2737 wake_up_session_caps(session, 0);
2738 break;
2739
fcff415c
YZ		 2740 case CEPH_SESSION_REJECT:
2741 WARN_ON(session->s_state != CEPH_MDS_SESSION_OPENING);
2742 pr_info("mds%d rejected session\n", session->s_mds);
2743 session->s_state = CEPH_MDS_SESSION_REJECTED;
2744 cleanup_session_requests(mdsc, session);
2745 remove_session_caps(session);
2746 wake = 2; /* for good measure */
2747 break;
2748
2f2dc053
SW		 2749 default:
2750 pr_err("mdsc_handle_session bad op %d mds%d\n", op, mds);
2751 WARN_ON(1);
2752 }
2753
2754 mutex_unlock(&session->s_mutex);
2755 if (wake) {
2756 mutex_lock(&mdsc->mutex);
2757 __wake_requests(mdsc, &session->s_waiting);
656e4382
YZ		 2758 if (wake == 2)
2759 kick_requests(mdsc, mds);
2f2dc053
SW		 2760 mutex_unlock(&mdsc->mutex);
2761 }
0a07fc8c
YZ		 2762 if (op == CEPH_SESSION_CLOSE)
2763 ceph_put_mds_session(session);
2f2dc053
SW		 2764 return;
2765
2766bad:
2767 pr_err("mdsc_handle_session corrupt message mds%d len %d\n", mds,
2768 (int)msg->front.iov_len);
9ec7cab1 2769 ceph_msg_dump(msg);
2f2dc053
SW		 2770 return;
2771}
2772
2773
2774/*
2775 * called under session->mutex.
2776 */
2777static void replay_unsafe_requests(struct ceph_mds_client *mdsc,
2778 struct ceph_mds_session *session)
2779{
2780 struct ceph_mds_request *req, *nreq;
3de22be6 2781 struct rb_node *p;
2f2dc053
SW		 2782 int err;
2783
2784 dout("replay_unsafe_requests mds%d\n", session->s_mds);
2785
2786 mutex_lock(&mdsc->mutex);
2787 list_for_each_entry_safe(req, nreq, &session->s_unsafe, r_unsafe_item) {
6e6f0923 2788 err = __prepare_send_request(mdsc, req, session->s_mds, true);
2f2dc053
SW		 2789 if (!err) {
2790 ceph_msg_get(req->r_request);
2791 ceph_con_send(&session->s_con, req->r_request);
2792 }
2793 }
3de22be6
YZ		 2794
2795 /*
2796 * also re-send old requests when MDS enters reconnect stage. So that MDS
2797 * can process completed request in clientreplay stage.
2798 */
2799 p = rb_first(&mdsc->request_tree);
2800 while (p) {
2801 req = rb_entry(p, struct ceph_mds_request, r_node);
2802 p = rb_next(p);
bc2de10d 2803 if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags))
3de22be6
YZ		 2804 continue;
2805 if (req->r_attempts == 0)
2806 continue; /* only old requests */
2807 if (req->r_session &&
2808 req->r_session->s_mds == session->s_mds) {
6e6f0923
YZ		 2809 err = __prepare_send_request(mdsc, req,
2810 session->s_mds, true);
3de22be6
YZ		 2811 if (!err) {
2812 ceph_msg_get(req->r_request);
2813 ceph_con_send(&session->s_con, req->r_request);
2814 }
2815 }
2816 }
2f2dc053
SW		 2817 mutex_unlock(&mdsc->mutex);
2818}
2819
2820/*
2821 * Encode information about a cap for a reconnect with the MDS.
2822 */
2f2dc053
SW		 2823static int encode_caps_cb(struct inode *inode, struct ceph_cap *cap,
2824 void *arg)
2825{
20cb34ae
SW		 2826 union {
2827 struct ceph_mds_cap_reconnect v2;
2828 struct ceph_mds_cap_reconnect_v1 v1;
2829 } rec;
2f2dc053 2830 struct ceph_inode_info *ci;
20cb34ae
SW		 2831 struct ceph_reconnect_state *recon_state = arg;
2832 struct ceph_pagelist *pagelist = recon_state->pagelist;
2f2dc053
SW		 2833 char *path;
2834 int pathlen, err;
2835 u64 pathbase;
3469ed0d 2836 u64 snap_follows;
2f2dc053
SW		 2837 struct dentry *dentry;
2838
2839 ci = cap->ci;
2840
2841 dout(" adding %p ino %llx.%llx cap %p %lld %s\n",
2842 inode, ceph_vinop(inode), cap, cap->cap_id,
2843 ceph_cap_string(cap->issued));
93cea5be
SW		 2844 err = ceph_pagelist_encode_64(pagelist, ceph_ino(inode));
2845 if (err)
2846 return err;
2f2dc053
SW		 2847
2848 dentry = d_find_alias(inode);
2849 if (dentry) {
2850 path = ceph_mdsc_build_path(dentry, &pathlen, &pathbase, 0);
2851 if (IS_ERR(path)) {
2852 err = PTR_ERR(path);
e072f8aa 2853 goto out_dput;
2f2dc053
SW		 2854 }
2855 } else {
2856 path = NULL;
2857 pathlen = 0;
4eacd4cb 2858 pathbase = 0;
2f2dc053 2859 }
2f2dc053 2860
be655596 2861 spin_lock(&ci->i_ceph_lock);
2f2dc053
SW		 2862 cap->seq = 0; /* reset cap seq */
2863 cap->issue_seq = 0; /* and issue_seq */
667ca05c 2864 cap->mseq = 0; /* and migrate_seq */
99a9c273 2865 cap->cap_gen = cap->session->s_cap_gen;
20cb34ae 2866
121f22a1 2867 if (recon_state->msg_version >= 2) {
20cb34ae
SW		 2868 rec.v2.cap_id = cpu_to_le64(cap->cap_id);
2869 rec.v2.wanted = cpu_to_le32(__ceph_caps_wanted(ci));
2870 rec.v2.issued = cpu_to_le32(cap->issued);
2871 rec.v2.snaprealm = cpu_to_le64(ci->i_snap_realm->ino);
2872 rec.v2.pathbase = cpu_to_le64(pathbase);
2873 rec.v2.flock_len = 0;
20cb34ae
SW		 2874 } else {
2875 rec.v1.cap_id = cpu_to_le64(cap->cap_id);
2876 rec.v1.wanted = cpu_to_le32(__ceph_caps_wanted(ci));
2877 rec.v1.issued = cpu_to_le32(cap->issued);
2878 rec.v1.size = cpu_to_le64(inode->i_size);
2879 ceph_encode_timespec(&rec.v1.mtime, &inode->i_mtime);
2880 ceph_encode_timespec(&rec.v1.atime, &inode->i_atime);
2881 rec.v1.snaprealm = cpu_to_le64(ci->i_snap_realm->ino);
2882 rec.v1.pathbase = cpu_to_le64(pathbase);
20cb34ae 2883 }
3469ed0d
YZ		 2884
2885 if (list_empty(&ci->i_cap_snaps)) {
92776fd2 2886 snap_follows = ci->i_head_snapc ? ci->i_head_snapc->seq : 0;
3469ed0d
YZ		 2887 } else {
2888 struct ceph_cap_snap *capsnap =
2889 list_first_entry(&ci->i_cap_snaps,
2890 struct ceph_cap_snap, ci_item);
2891 snap_follows = capsnap->follows;
20cb34ae 2892 }
be655596 2893 spin_unlock(&ci->i_ceph_lock);
2f2dc053 2894
121f22a1 2895 if (recon_state->msg_version >= 2) {
40819f6f 2896 int num_fcntl_locks, num_flock_locks;
39be95e9 2897 struct ceph_filelock *flocks;
121f22a1
YZ		 2898 size_t struct_len, total_len = 0;
2899 u8 struct_v = 0;
39be95e9
JS		 2900
2901encode_again:
39be95e9 2902 ceph_count_locks(inode, &num_fcntl_locks, &num_flock_locks);
39be95e9
JS		 2903 flocks = kmalloc((num_fcntl_locks+num_flock_locks) *
2904 sizeof(struct ceph_filelock), GFP_NOFS);
2905 if (!flocks) {
2906 err = -ENOMEM;
2907 goto out_free;
2908 }
39be95e9
JS		 2909 err = ceph_encode_locks_to_buffer(inode, flocks,
2910 num_fcntl_locks,
2911 num_flock_locks);
39be95e9
JS		 2912 if (err) {
2913 kfree(flocks);
2914 if (err == -ENOSPC)
2915 goto encode_again;
2916 goto out_free;
2917 }
121f22a1
YZ		 2918
2919 if (recon_state->msg_version >= 3) {
2920 /* version, compat_version and struct_len */
2921 total_len = 2 * sizeof(u8) + sizeof(u32);
3469ed0d 2922 struct_v = 2;
121f22a1 2923 }
39be95e9
JS		 2924 /*
2925 * number of encoded locks is stable, so copy to pagelist
2926 */
121f22a1
YZ		 2927 struct_len = 2 * sizeof(u32) +
2928 (num_fcntl_locks + num_flock_locks) *
2929 sizeof(struct ceph_filelock);
2930 rec.v2.flock_len = cpu_to_le32(struct_len);
2931
2932 struct_len += sizeof(rec.v2);
2933 struct_len += sizeof(u32) + pathlen;
2934
3469ed0d
YZ		 2935 if (struct_v >= 2)
2936 struct_len += sizeof(u64); /* snap_follows */
2937
121f22a1
YZ		 2938 total_len += struct_len;
2939 err = ceph_pagelist_reserve(pagelist, total_len);
2940
2941 if (!err) {
2942 if (recon_state->msg_version >= 3) {
2943 ceph_pagelist_encode_8(pagelist, struct_v);
2944 ceph_pagelist_encode_8(pagelist, 1);
2945 ceph_pagelist_encode_32(pagelist, struct_len);
2946 }
2947 ceph_pagelist_encode_string(pagelist, path, pathlen);
2948 ceph_pagelist_append(pagelist, &rec, sizeof(rec.v2));
2949 ceph_locks_to_pagelist(flocks, pagelist,
2950 num_fcntl_locks,
2951 num_flock_locks);
3469ed0d
YZ		 2952 if (struct_v >= 2)
2953 ceph_pagelist_encode_64(pagelist, snap_follows);
121f22a1 2954 }
39be95e9 2955 kfree(flocks);
3612abbd 2956 } else {
121f22a1
YZ		 2957 size_t size = sizeof(u32) + pathlen + sizeof(rec.v1);
2958 err = ceph_pagelist_reserve(pagelist, size);
2959 if (!err) {
2960 ceph_pagelist_encode_string(pagelist, path, pathlen);
2961 ceph_pagelist_append(pagelist, &rec, sizeof(rec.v1));
2962 }
40819f6f 2963 }
44c99757
YZ		 2964
2965 recon_state->nr_caps++;
e072f8aa 2966out_free:
2f2dc053 2967 kfree(path);
e072f8aa 2968out_dput:
2f2dc053 2969 dput(dentry);
93cea5be 2970 return err;
2f2dc053
SW		 2971}
2972
2973
2974/*
2975 * If an MDS fails and recovers, clients need to reconnect in order to
2976 * reestablish shared state. This includes all caps issued through
2977 * this session _and_ the snap_realm hierarchy. Because it's not
2978 * clear which snap realms the mds cares about, we send everything we
2979 * know about.. that ensures we'll then get any new info the
2980 * recovering MDS might have.
2981 *
2982 * This is a relatively heavyweight operation, but it's rare.
2983 *
2984 * called with mdsc->mutex held.
2985 */
34b6c855
SW		 2986static void send_mds_reconnect(struct ceph_mds_client *mdsc,
2987 struct ceph_mds_session *session)
2f2dc053 2988{
2f2dc053 2989 struct ceph_msg *reply;
a105f00c 2990 struct rb_node *p;
34b6c855 2991 int mds = session->s_mds;
9abf82b8 2992 int err = -ENOMEM;
44c99757 2993 int s_nr_caps;
93cea5be 2994 struct ceph_pagelist *pagelist;
20cb34ae 2995 struct ceph_reconnect_state recon_state;
2f2dc053 2996
34b6c855 2997 pr_info("mds%d reconnect start\n", mds);
2f2dc053 2998
93cea5be
SW		 2999 pagelist = kmalloc(sizeof(*pagelist), GFP_NOFS);
3000 if (!pagelist)
3001 goto fail_nopagelist;
3002 ceph_pagelist_init(pagelist);
3003
b61c2763 3004 reply = ceph_msg_new(CEPH_MSG_CLIENT_RECONNECT, 0, GFP_NOFS, false);
a79832f2 3005 if (!reply)
93cea5be 3006 goto fail_nomsg;
93cea5be 3007
34b6c855
SW		 3008 mutex_lock(&session->s_mutex);
3009 session->s_state = CEPH_MDS_SESSION_RECONNECTING;
3010 session->s_seq = 0;
2f2dc053 3011
2f2dc053 3012 dout("session %p state %s\n", session,
a687ecaf 3013 ceph_session_state_name(session->s_state));
2f2dc053 3014
99a9c273
YZ		 3015 spin_lock(&session->s_gen_ttl_lock);
3016 session->s_cap_gen++;
3017 spin_unlock(&session->s_gen_ttl_lock);
3018
3019 spin_lock(&session->s_cap_lock);
03f4fcb0
YZ		 3020 /* don't know if session is readonly */
3021 session->s_readonly = 0;
99a9c273
YZ		 3022 /*
3023 * notify __ceph_remove_cap() that we are composing cap reconnect.
3024 * If a cap get released before being added to the cap reconnect,
3025 * __ceph_remove_cap() should skip queuing cap release.
3026 */
3027 session->s_cap_reconnect = 1;
e01a5946 3028 /* drop old cap expires; we're about to reestablish that state */
745a8e3b 3029 cleanup_cap_releases(mdsc, session);
e01a5946 3030
5d23371f 3031 /* trim unused caps to reduce MDS's cache rejoin time */
c0bd50e2
YZ		 3032 if (mdsc->fsc->sb->s_root)
3033 shrink_dcache_parent(mdsc->fsc->sb->s_root);
5d23371f
YZ		 3034
3035 ceph_con_close(&session->s_con);
3036 ceph_con_open(&session->s_con,
3037 CEPH_ENTITY_TYPE_MDS, mds,
3038 ceph_mdsmap_get_addr(mdsc->mdsmap, mds));
3039
3040 /* replay unsafe requests */
3041 replay_unsafe_requests(mdsc, session);
3042
3043 down_read(&mdsc->snap_rwsem);
3044
2f2dc053 3045 /* traverse this session's caps */
44c99757
YZ		 3046 s_nr_caps = session->s_nr_caps;
3047 err = ceph_pagelist_encode_32(pagelist, s_nr_caps);
93cea5be
SW		 3048 if (err)
3049 goto fail;
20cb34ae 3050
44c99757 3051 recon_state.nr_caps = 0;
20cb34ae 3052 recon_state.pagelist = pagelist;
121f22a1
YZ		 3053 if (session->s_con.peer_features & CEPH_FEATURE_MDSENC)
3054 recon_state.msg_version = 3;
3055 else if (session->s_con.peer_features & CEPH_FEATURE_FLOCK)
3056 recon_state.msg_version = 2;
3057 else
3058 recon_state.msg_version = 1;
20cb34ae 3059 err = iterate_session_caps(session, encode_caps_cb, &recon_state);
2f2dc053 3060 if (err < 0)
9abf82b8 3061 goto fail;
2f2dc053 3062
99a9c273
YZ		 3063 spin_lock(&session->s_cap_lock);
3064 session->s_cap_reconnect = 0;
3065 spin_unlock(&session->s_cap_lock);
3066
2f2dc053
SW		 3067 /*
3068 * snaprealms. we provide mds with the ino, seq (version), and
3069 * parent for all of our realms. If the mds has any newer info,
3070 * it will tell us.
3071 */
a105f00c
SW		 3072 for (p = rb_first(&mdsc->snap_realms); p; p = rb_next(p)) {
3073 struct ceph_snap_realm *realm =
3074 rb_entry(p, struct ceph_snap_realm, node);
93cea5be 3075 struct ceph_mds_snaprealm_reconnect sr_rec;
2f2dc053
SW		 3076
3077 dout(" adding snap realm %llx seq %lld parent %llx\n",
3078 realm->ino, realm->seq, realm->parent_ino);
93cea5be
SW		 3079 sr_rec.ino = cpu_to_le64(realm->ino);
3080 sr_rec.seq = cpu_to_le64(realm->seq);
3081 sr_rec.parent = cpu_to_le64(realm->parent_ino);
3082 err = ceph_pagelist_append(pagelist, &sr_rec, sizeof(sr_rec));
3083 if (err)
3084 goto fail;
2f2dc053 3085 }
2f2dc053 3086
121f22a1 3087 reply->hdr.version = cpu_to_le16(recon_state.msg_version);
44c99757
YZ		 3088
3089 /* raced with cap release? */
3090 if (s_nr_caps != recon_state.nr_caps) {
3091 struct page *page = list_first_entry(&pagelist->head,
3092 struct page, lru);
3093 __le32 *addr = kmap_atomic(page);
3094 *addr = cpu_to_le32(recon_state.nr_caps);
3095 kunmap_atomic(addr);
ebf18f47 3096 }
44c99757
YZ		 3097
3098 reply->hdr.data_len = cpu_to_le32(pagelist->length);
3099 ceph_msg_data_add_pagelist(reply, pagelist);
e548e9b9
YZ		 3100
3101 ceph_early_kick_flushing_caps(mdsc, session);
3102
2f2dc053
SW		 3103 ceph_con_send(&session->s_con, reply);
3104
9abf82b8
SW		 3105 mutex_unlock(&session->s_mutex);
3106
3107 mutex_lock(&mdsc->mutex);
3108 __wake_requests(mdsc, &session->s_waiting);
3109 mutex_unlock(&mdsc->mutex);
3110
2f2dc053 3111 up_read(&mdsc->snap_rwsem);
2f2dc053
SW		 3112 return;
3113
93cea5be 3114fail:
2f2dc053 3115 ceph_msg_put(reply);
9abf82b8
SW		 3116 up_read(&mdsc->snap_rwsem);
3117 mutex_unlock(&session->s_mutex);
93cea5be
SW		 3118fail_nomsg:
3119 ceph_pagelist_release(pagelist);
93cea5be 3120fail_nopagelist:
9abf82b8 3121 pr_err("error %d preparing reconnect for mds%d\n", err, mds);
9abf82b8 3122 return;
2f2dc053
SW		 3123}
3124
3125
3126/*
3127 * compare old and new mdsmaps, kicking requests
3128 * and closing out old connections as necessary
3129 *
3130 * called under mdsc->mutex.
3131 */
3132static void check_new_map(struct ceph_mds_client *mdsc,
3133 struct ceph_mdsmap *newmap,
3134 struct ceph_mdsmap *oldmap)
3135{
3136 int i;
3137 int oldstate, newstate;
3138 struct ceph_mds_session *s;
3139
3140 dout("check_new_map new %u old %u\n",
3141 newmap->m_epoch, oldmap->m_epoch);
3142
76201b63 3143 for (i = 0; i < oldmap->m_num_mds && i < mdsc->max_sessions; i++) {
d37b1d99 3144 if (!mdsc->sessions[i])
2f2dc053
SW		 3145 continue;
3146 s = mdsc->sessions[i];
3147 oldstate = ceph_mdsmap_get_state(oldmap, i);
3148 newstate = ceph_mdsmap_get_state(newmap, i);
3149
0deb01c9 3150 dout("check_new_map mds%d state %s%s -> %s%s (session %s)\n",
2f2dc053 3151 i, ceph_mds_state_name(oldstate),
0deb01c9 3152 ceph_mdsmap_is_laggy(oldmap, i) ? " (laggy)" : "",
2f2dc053 3153 ceph_mds_state_name(newstate),
0deb01c9 3154 ceph_mdsmap_is_laggy(newmap, i) ? " (laggy)" : "",
a687ecaf 3155 ceph_session_state_name(s->s_state));
2f2dc053 3156
76201b63 3157 if (i >= newmap->m_num_mds ||
3e8f43a0 3158 memcmp(ceph_mdsmap_get_addr(oldmap, i),
2f2dc053
SW		 3159 ceph_mdsmap_get_addr(newmap, i),
3160 sizeof(struct ceph_entity_addr))) {
3161 if (s->s_state == CEPH_MDS_SESSION_OPENING) {
3162 /* the session never opened, just close it
3163 * out now */
0a07fc8c 3164 get_session(s);
2600d2dd 3165 __unregister_session(mdsc, s);
2f2dc053 3166 __wake_requests(mdsc, &s->s_waiting);
0a07fc8c 3167 ceph_put_mds_session(s);
2827528d
YZ		 3168 } else if (i >= newmap->m_num_mds) {
3169 /* force close session for stopped mds */
3170 get_session(s);
2600d2dd 3171 __unregister_session(mdsc, s);
2827528d
YZ		 3172 __wake_requests(mdsc, &s->s_waiting);
3173 kick_requests(mdsc, i);
3174 mutex_unlock(&mdsc->mutex);
3175
3176 mutex_lock(&s->s_mutex);
3177 cleanup_session_requests(mdsc, s);
3178 remove_session_caps(s);
3179 mutex_unlock(&s->s_mutex);
3180
3181 ceph_put_mds_session(s);
3182
3183 mutex_lock(&mdsc->mutex);
2f2dc053
SW		 3184 } else {
3185 /* just close it */
3186 mutex_unlock(&mdsc->mutex);
3187 mutex_lock(&s->s_mutex);
3188 mutex_lock(&mdsc->mutex);
3189 ceph_con_close(&s->s_con);
3190 mutex_unlock(&s->s_mutex);
3191 s->s_state = CEPH_MDS_SESSION_RESTARTING;
3192 }
2f2dc053
SW		 3193 } else if (oldstate == newstate) {
3194 continue; /* nothing new with this mds */
3195 }
3196
3197 /*
3198 * send reconnect?
3199 */
3200 if (s->s_state == CEPH_MDS_SESSION_RESTARTING &&
34b6c855
SW		 3201 newstate >= CEPH_MDS_STATE_RECONNECT) {
3202 mutex_unlock(&mdsc->mutex);
3203 send_mds_reconnect(mdsc, s);
3204 mutex_lock(&mdsc->mutex);
3205 }
2f2dc053
SW		 3206
3207 /*
29790f26 3208 * kick request on any mds that has gone active.
2f2dc053
SW		 3209 */
3210 if (oldstate < CEPH_MDS_STATE_ACTIVE &&
3211 newstate >= CEPH_MDS_STATE_ACTIVE) {
29790f26
SW		 3212 if (oldstate != CEPH_MDS_STATE_CREATING &&
3213 oldstate != CEPH_MDS_STATE_STARTING)
3214 pr_info("mds%d recovery completed\n", s->s_mds);
3215 kick_requests(mdsc, i);
2f2dc053 3216 ceph_kick_flushing_caps(mdsc, s);
0dc2570f 3217 wake_up_session_caps(s, 1);
2f2dc053
SW		 3218 }
3219 }
cb170a22 3220
76201b63 3221 for (i = 0; i < newmap->m_num_mds && i < mdsc->max_sessions; i++) {
cb170a22
SW		 3222 s = mdsc->sessions[i];
3223 if (!s)
3224 continue;
3225 if (!ceph_mdsmap_is_laggy(newmap, i))
3226 continue;
3227 if (s->s_state == CEPH_MDS_SESSION_OPEN ||
3228 s->s_state == CEPH_MDS_SESSION_HUNG ||
3229 s->s_state == CEPH_MDS_SESSION_CLOSING) {
3230 dout(" connecting to export targets of laggy mds%d\n",
3231 i);
3232 __open_export_target_sessions(mdsc, s);
3233 }
3234 }
2f2dc053
SW		 3235}
3236
3237
3238
3239/*
3240 * leases
3241 */
3242
3243/*
3244 * caller must hold session s_mutex, dentry->d_lock
3245 */
3246void __ceph_mdsc_drop_dentry_lease(struct dentry *dentry)
3247{
3248 struct ceph_dentry_info *di = ceph_dentry(dentry);
3249
3250 ceph_put_mds_session(di->lease_session);
3251 di->lease_session = NULL;
3252}
3253
2600d2dd
SW		 3254static void handle_lease(struct ceph_mds_client *mdsc,
3255 struct ceph_mds_session *session,
3256 struct ceph_msg *msg)
2f2dc053 3257{
3d14c5d2 3258 struct super_block *sb = mdsc->fsc->sb;
2f2dc053 3259 struct inode *inode;
2f2dc053
SW		 3260 struct dentry *parent, *dentry;
3261 struct ceph_dentry_info *di;
2600d2dd 3262 int mds = session->s_mds;
2f2dc053 3263 struct ceph_mds_lease *h = msg->front.iov_base;
1e5ea23d 3264 u32 seq;
2f2dc053 3265 struct ceph_vino vino;
2f2dc053
SW		 3266 struct qstr dname;
3267 int release = 0;
3268
2f2dc053
SW		 3269 dout("handle_lease from mds%d\n", mds);
3270
3271 /* decode */
3272 if (msg->front.iov_len < sizeof(*h) + sizeof(u32))
3273 goto bad;
3274 vino.ino = le64_to_cpu(h->ino);
3275 vino.snap = CEPH_NOSNAP;
1e5ea23d 3276 seq = le32_to_cpu(h->seq);
2f2dc053
SW		 3277 dname.name = (void *)h + sizeof(*h) + sizeof(u32);
3278 dname.len = msg->front.iov_len - sizeof(*h) - sizeof(u32);
3279 if (dname.len != get_unaligned_le32(h+1))
3280 goto bad;
3281
2f2dc053
SW		 3282 /* lookup inode */
3283 inode = ceph_find_inode(sb, vino);
2f90b852
SW		 3284 dout("handle_lease %s, ino %llx %p %.*s\n",
3285 ceph_lease_op_name(h->action), vino.ino, inode,
1e5ea23d 3286 dname.len, dname.name);
6cd3bcad
YZ		 3287
3288 mutex_lock(&session->s_mutex);
3289 session->s_seq++;
3290
d37b1d99 3291 if (!inode) {
2f2dc053
SW		 3292 dout("handle_lease no inode %llx\n", vino.ino);
3293 goto release;
3294 }
2f2dc053
SW		 3295
3296 /* dentry */
3297 parent = d_find_alias(inode);
3298 if (!parent) {
3299 dout("no parent dentry on inode %p\n", inode);
3300 WARN_ON(1);
3301 goto release; /* hrm... */
3302 }
8387ff25 3303 dname.hash = full_name_hash(parent, dname.name, dname.len);
2f2dc053
SW		 3304 dentry = d_lookup(parent, &dname);
3305 dput(parent);
3306 if (!dentry)
3307 goto release;
3308
3309 spin_lock(&dentry->d_lock);
3310 di = ceph_dentry(dentry);
3311 switch (h->action) {
3312 case CEPH_MDS_LEASE_REVOKE:
3d8eb7a9 3313 if (di->lease_session == session) {
1e5ea23d
SW		 3314 if (ceph_seq_cmp(di->lease_seq, seq) > 0)
3315 h->seq = cpu_to_le32(di->lease_seq);
2f2dc053
SW		 3316 __ceph_mdsc_drop_dentry_lease(dentry);
3317 }
3318 release = 1;
3319 break;
3320
3321 case CEPH_MDS_LEASE_RENEW:
3d8eb7a9 3322 if (di->lease_session == session &&
2f2dc053
SW		 3323 di->lease_gen == session->s_cap_gen &&
3324 di->lease_renew_from &&
3325 di->lease_renew_after == 0) {
3326 unsigned long duration =
3563dbdd 3327 msecs_to_jiffies(le32_to_cpu(h->duration_ms));
2f2dc053 3328
1e5ea23d 3329 di->lease_seq = seq;
9b16f03c 3330 di->time = di->lease_renew_from + duration;
2f2dc053
SW		 3331 di->lease_renew_after = di->lease_renew_from +
3332 (duration >> 1);
3333 di->lease_renew_from = 0;
3334 }
3335 break;
3336 }
3337 spin_unlock(&dentry->d_lock);
3338 dput(dentry);
3339
3340 if (!release)
3341 goto out;
3342
3343release:
3344 /* let's just reuse the same message */
3345 h->action = CEPH_MDS_LEASE_REVOKE_ACK;
3346 ceph_msg_get(msg);
3347 ceph_con_send(&session->s_con, msg);
3348
3349out:
3350 iput(inode);
3351 mutex_unlock(&session->s_mutex);
2f2dc053
SW		 3352 return;
3353
3354bad:
3355 pr_err("corrupt lease message\n");
9ec7cab1 3356 ceph_msg_dump(msg);
2f2dc053
SW		 3357}
3358
3359void ceph_mdsc_lease_send_msg(struct ceph_mds_session *session,
3360 struct inode *inode,
3361 struct dentry *dentry, char action,
3362 u32 seq)
3363{
3364 struct ceph_msg *msg;
3365 struct ceph_mds_lease *lease;
3366 int len = sizeof(*lease) + sizeof(u32);
3367 int dnamelen = 0;
3368
3369 dout("lease_send_msg inode %p dentry %p %s to mds%d\n",
3370 inode, dentry, ceph_lease_op_name(action), session->s_mds);
3371 dnamelen = dentry->d_name.len;
3372 len += dnamelen;
3373
b61c2763 3374 msg = ceph_msg_new(CEPH_MSG_CLIENT_LEASE, len, GFP_NOFS, false);
a79832f2 3375 if (!msg)
2f2dc053
SW		 3376 return;
3377 lease = msg->front.iov_base;
3378 lease->action = action;
2f2dc053
SW		 3379 lease->ino = cpu_to_le64(ceph_vino(inode).ino);
3380 lease->first = lease->last = cpu_to_le64(ceph_vino(inode).snap);
3381 lease->seq = cpu_to_le32(seq);
3382 put_unaligned_le32(dnamelen, lease + 1);
3383 memcpy((void *)(lease + 1) + 4, dentry->d_name.name, dnamelen);
3384
3385 /*
3386 * if this is a preemptive lease RELEASE, no need to
3387 * flush request stream, since the actual request will
3388 * soon follow.
3389 */
3390 msg->more_to_follow = (action == CEPH_MDS_LEASE_RELEASE);
3391
3392 ceph_con_send(&session->s_con, msg);
3393}
3394
2f2dc053
SW		 3395/*
3396 * drop all leases (and dentry refs) in preparation for umount
3397 */
3398static void drop_leases(struct ceph_mds_client *mdsc)
3399{
3400 int i;
3401
3402 dout("drop_leases\n");
3403 mutex_lock(&mdsc->mutex);
3404 for (i = 0; i < mdsc->max_sessions; i++) {
3405 struct ceph_mds_session *s = __ceph_lookup_mds_session(mdsc, i);
3406 if (!s)
3407 continue;
3408 mutex_unlock(&mdsc->mutex);
3409 mutex_lock(&s->s_mutex);
3410 mutex_unlock(&s->s_mutex);
3411 ceph_put_mds_session(s);
3412 mutex_lock(&mdsc->mutex);
3413 }
3414 mutex_unlock(&mdsc->mutex);
3415}
3416
3417
3418
3419/*
3420 * delayed work -- periodically trim expired leases, renew caps with mds
3421 */
3422static void schedule_delayed(struct ceph_mds_client *mdsc)
3423{
3424 int delay = 5;
3425 unsigned hz = round_jiffies_relative(HZ * delay);
3426 schedule_delayed_work(&mdsc->delayed_work, hz);
3427}
3428
3429static void delayed_work(struct work_struct *work)
3430{
3431 int i;
3432 struct ceph_mds_client *mdsc =
3433 container_of(work, struct ceph_mds_client, delayed_work.work);
3434 int renew_interval;
3435 int renew_caps;
3436
3437 dout("mdsc delayed_work\n");
afcdaea3 3438 ceph_check_delayed_caps(mdsc);
2f2dc053
SW		 3439
3440 mutex_lock(&mdsc->mutex);
3441 renew_interval = mdsc->mdsmap->m_session_timeout >> 2;
3442 renew_caps = time_after_eq(jiffies, HZ*renew_interval +
3443 mdsc->last_renew_caps);
3444 if (renew_caps)
3445 mdsc->last_renew_caps = jiffies;
3446
3447 for (i = 0; i < mdsc->max_sessions; i++) {
3448 struct ceph_mds_session *s = __ceph_lookup_mds_session(mdsc, i);
d37b1d99 3449 if (!s)
2f2dc053
SW		 3450 continue;
3451 if (s->s_state == CEPH_MDS_SESSION_CLOSING) {
3452 dout("resending session close request for mds%d\n",
3453 s->s_mds);
3454 request_close_session(mdsc, s);
3455 ceph_put_mds_session(s);
3456 continue;
3457 }
3458 if (s->s_ttl && time_after(jiffies, s->s_ttl)) {
3459 if (s->s_state == CEPH_MDS_SESSION_OPEN) {
3460 s->s_state = CEPH_MDS_SESSION_HUNG;
3461 pr_info("mds%d hung\n", s->s_mds);
3462 }
3463 }
3464 if (s->s_state < CEPH_MDS_SESSION_OPEN) {
3465 /* this mds is failed or recovering, just wait */
3466 ceph_put_mds_session(s);
3467 continue;
3468 }
3469 mutex_unlock(&mdsc->mutex);
3470
3471 mutex_lock(&s->s_mutex);
3472 if (renew_caps)
3473 send_renew_caps(mdsc, s);
3474 else
3475 ceph_con_keepalive(&s->s_con);
aab53dd9
SW		 3476 if (s->s_state == CEPH_MDS_SESSION_OPEN ||
3477 s->s_state == CEPH_MDS_SESSION_HUNG)
3d7ded4d 3478 ceph_send_cap_releases(mdsc, s);
2f2dc053
SW		 3479 mutex_unlock(&s->s_mutex);
3480 ceph_put_mds_session(s);
3481
3482 mutex_lock(&mdsc->mutex);
3483 }
3484 mutex_unlock(&mdsc->mutex);
3485
3486 schedule_delayed(mdsc);
3487}
3488
3d14c5d2 3489int ceph_mdsc_init(struct ceph_fs_client *fsc)
2f2dc053 3490
2f2dc053 3491{
3d14c5d2
YS		 3492 struct ceph_mds_client *mdsc;
3493
3494 mdsc = kzalloc(sizeof(struct ceph_mds_client), GFP_NOFS);
3495 if (!mdsc)
3496 return -ENOMEM;
3497 mdsc->fsc = fsc;
3498 fsc->mdsc = mdsc;
2f2dc053
SW		 3499 mutex_init(&mdsc->mutex);
3500 mdsc->mdsmap = kzalloc(sizeof(*mdsc->mdsmap), GFP_NOFS);
d37b1d99 3501 if (!mdsc->mdsmap) {
fb3101b6 3502 kfree(mdsc);
2d06eeb8 3503 return -ENOMEM;
fb3101b6 3504 }
2d06eeb8 3505
2f2dc053 3506 init_completion(&mdsc->safe_umount_waiters);
f3c60c59 3507 init_waitqueue_head(&mdsc->session_close_wq);
2f2dc053
SW		 3508 INIT_LIST_HEAD(&mdsc->waiting_for_map);
3509 mdsc->sessions = NULL;
86d8f67b 3510 atomic_set(&mdsc->num_sessions, 0);
2f2dc053
SW		 3511 mdsc->max_sessions = 0;
3512 mdsc->stopping = 0;
affbc19a 3513 mdsc->last_snap_seq = 0;
2f2dc053 3514 init_rwsem(&mdsc->snap_rwsem);
a105f00c 3515 mdsc->snap_realms = RB_ROOT;
2f2dc053
SW		 3516 INIT_LIST_HEAD(&mdsc->snap_empty);
3517 spin_lock_init(&mdsc->snap_empty_lock);
3518 mdsc->last_tid = 0;
e8a7b8b1 3519 mdsc->oldest_tid = 0;
44ca18f2 3520 mdsc->request_tree = RB_ROOT;
2f2dc053
SW		 3521 INIT_DELAYED_WORK(&mdsc->delayed_work, delayed_work);
3522 mdsc->last_renew_caps = jiffies;
3523 INIT_LIST_HEAD(&mdsc->cap_delay_list);
3524 spin_lock_init(&mdsc->cap_delay_lock);
3525 INIT_LIST_HEAD(&mdsc->snap_flush_list);
3526 spin_lock_init(&mdsc->snap_flush_lock);
553adfd9 3527 mdsc->last_cap_flush_tid = 1;
e4500b5e 3528 INIT_LIST_HEAD(&mdsc->cap_flush_list);
2f2dc053 3529 INIT_LIST_HEAD(&mdsc->cap_dirty);
db354052 3530 INIT_LIST_HEAD(&mdsc->cap_dirty_migrating);
2f2dc053
SW		 3531 mdsc->num_cap_flushing = 0;
3532 spin_lock_init(&mdsc->cap_dirty_lock);
3533 init_waitqueue_head(&mdsc->cap_flushing_wq);
3534 spin_lock_init(&mdsc->dentry_lru_lock);
3535 INIT_LIST_HEAD(&mdsc->dentry_lru);
2d06eeb8 3536
37151668 3537 ceph_caps_init(mdsc);
3d14c5d2 3538 ceph_adjust_min_caps(mdsc, fsc->min_caps);
37151668 3539
10183a69
YZ		 3540 init_rwsem(&mdsc->pool_perm_rwsem);
3541 mdsc->pool_perm_tree = RB_ROOT;
3542
717e6f28
YZ		 3543 strncpy(mdsc->nodename, utsname()->nodename,
3544 sizeof(mdsc->nodename) - 1);
5f44f142 3545 return 0;
2f2dc053
SW		 3546}
3547
3548/*
3549 * Wait for safe replies on open mds requests. If we time out, drop
3550 * all requests from the tree to avoid dangling dentry refs.
3551 */
3552static void wait_requests(struct ceph_mds_client *mdsc)
3553{
a319bf56 3554 struct ceph_options *opts = mdsc->fsc->client->options;
2f2dc053 3555 struct ceph_mds_request *req;
2f2dc053
SW		 3556
3557 mutex_lock(&mdsc->mutex);
44ca18f2 3558 if (__get_oldest_req(mdsc)) {
2f2dc053 3559 mutex_unlock(&mdsc->mutex);
44ca18f2 3560
2f2dc053
SW		 3561 dout("wait_requests waiting for requests\n");
3562 wait_for_completion_timeout(&mdsc->safe_umount_waiters,
a319bf56 3563 ceph_timeout_jiffies(opts->mount_timeout));
2f2dc053
SW		 3564
3565 /* tear down remaining requests */
44ca18f2
SW		 3566 mutex_lock(&mdsc->mutex);
3567 while ((req = __get_oldest_req(mdsc))) {
2f2dc053
SW		 3568 dout("wait_requests timed out on tid %llu\n",
3569 req->r_tid);
44ca18f2 3570 __unregister_request(mdsc, req);
2f2dc053
SW		 3571 }
3572 }
3573 mutex_unlock(&mdsc->mutex);
3574 dout("wait_requests done\n");
3575}
3576
3577/*
3578 * called before mount is ro, and before dentries are torn down.
3579 * (hmm, does this still race with new lookups?)
3580 */
3581void ceph_mdsc_pre_umount(struct ceph_mds_client *mdsc)
3582{
3583 dout("pre_umount\n");
3584 mdsc->stopping = 1;
3585
3586 drop_leases(mdsc);
afcdaea3 3587 ceph_flush_dirty_caps(mdsc);
2f2dc053 3588 wait_requests(mdsc);
17c688c3
SW		 3589
3590 /*
3591 * wait for reply handlers to drop their request refs and
3592 * their inode/dcache refs
3593 */
3594 ceph_msgr_flush();
2f2dc053
SW		 3595}
3596
3597/*
3598 * wait for all write mds requests to flush.
3599 */
3600static void wait_unsafe_requests(struct ceph_mds_client *mdsc, u64 want_tid)
3601{
80fc7314 3602 struct ceph_mds_request *req = NULL, *nextreq;
44ca18f2 3603 struct rb_node *n;
2f2dc053
SW		 3604
3605 mutex_lock(&mdsc->mutex);
3606 dout("wait_unsafe_requests want %lld\n", want_tid);
80fc7314 3607restart:
44ca18f2
SW		 3608 req = __get_oldest_req(mdsc);
3609 while (req && req->r_tid <= want_tid) {
80fc7314
SW		 3610 /* find next request */
3611 n = rb_next(&req->r_node);
3612 if (n)
3613 nextreq = rb_entry(n, struct ceph_mds_request, r_node);
3614 else
3615 nextreq = NULL;
e8a7b8b1
YZ		 3616 if (req->r_op != CEPH_MDS_OP_SETFILELOCK &&
3617 (req->r_op & CEPH_MDS_OP_WRITE)) {
44ca18f2
SW		 3618 /* write op */
3619 ceph_mdsc_get_request(req);
80fc7314
SW		 3620 if (nextreq)
3621 ceph_mdsc_get_request(nextreq);
44ca18f2
SW		 3622 mutex_unlock(&mdsc->mutex);
3623 dout("wait_unsafe_requests wait on %llu (want %llu)\n",
3624 req->r_tid, want_tid);
3625 wait_for_completion(&req->r_safe_completion);
3626 mutex_lock(&mdsc->mutex);
44ca18f2 3627 ceph_mdsc_put_request(req);
80fc7314
SW		 3628 if (!nextreq)
3629 break; /* next dne before, so we're done! */
3630 if (RB_EMPTY_NODE(&nextreq->r_node)) {
3631 /* next request was removed from tree */
3632 ceph_mdsc_put_request(nextreq);
3633 goto restart;
3634 }
3635 ceph_mdsc_put_request(nextreq); /* won't go away */
44ca18f2 3636 }
80fc7314 3637 req = nextreq;
2f2dc053
SW		 3638 }
3639 mutex_unlock(&mdsc->mutex);
3640 dout("wait_unsafe_requests done\n");
3641}
3642
3643void ceph_mdsc_sync(struct ceph_mds_client *mdsc)
3644{
0e294387 3645 u64 want_tid, want_flush;
2f2dc053 3646
52953d55 3647 if (READ_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_SHUTDOWN)
56b7cf95
SW		 3648 return;
3649
2f2dc053
SW		 3650 dout("sync\n");
3651 mutex_lock(&mdsc->mutex);
3652 want_tid = mdsc->last_tid;
2f2dc053 3653 mutex_unlock(&mdsc->mutex);
2f2dc053 3654
afcdaea3 3655 ceph_flush_dirty_caps(mdsc);
d3383a8e 3656 spin_lock(&mdsc->cap_dirty_lock);
8310b089 3657 want_flush = mdsc->last_cap_flush_tid;
c8799fc4
YZ		 3658 if (!list_empty(&mdsc->cap_flush_list)) {
3659 struct ceph_cap_flush *cf =
3660 list_last_entry(&mdsc->cap_flush_list,
3661 struct ceph_cap_flush, g_list);
3662 cf->wake = true;
3663 }
d3383a8e
YZ		 3664 spin_unlock(&mdsc->cap_dirty_lock);
3665
0e294387
YZ		 3666 dout("sync want tid %lld flush_seq %lld\n",
3667 want_tid, want_flush);
2f2dc053
SW		 3668
3669 wait_unsafe_requests(mdsc, want_tid);
0e294387 3670 wait_caps_flush(mdsc, want_flush);
2f2dc053
SW		 3671}
3672
f3c60c59
SW		 3673/*
3674 * true if all sessions are closed, or we force unmount
3675 */
fcff415c 3676static bool done_closing_sessions(struct ceph_mds_client *mdsc, int skipped)
f3c60c59 3677{
52953d55 3678 if (READ_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_SHUTDOWN)
f3c60c59 3679 return true;
fcff415c 3680 return atomic_read(&mdsc->num_sessions) <= skipped;
f3c60c59 3681}
2f2dc053
SW		 3682
3683/*
3684 * called after sb is ro.
3685 */
3686void ceph_mdsc_close_sessions(struct ceph_mds_client *mdsc)
3687{
a319bf56 3688 struct ceph_options *opts = mdsc->fsc->client->options;
2f2dc053
SW		 3689 struct ceph_mds_session *session;
3690 int i;
fcff415c 3691 int skipped = 0;
2f2dc053
SW		 3692
3693 dout("close_sessions\n");
3694
2f2dc053 3695 /* close sessions */
f3c60c59
SW		 3696 mutex_lock(&mdsc->mutex);
3697 for (i = 0; i < mdsc->max_sessions; i++) {
3698 session = __ceph_lookup_mds_session(mdsc, i);
3699 if (!session)
3700 continue;
2f2dc053 3701 mutex_unlock(&mdsc->mutex);
f3c60c59 3702 mutex_lock(&session->s_mutex);
fcff415c
YZ		 3703 if (__close_session(mdsc, session) <= 0)
3704 skipped++;
f3c60c59
SW		 3705 mutex_unlock(&session->s_mutex);
3706 ceph_put_mds_session(session);
2f2dc053
SW		 3707 mutex_lock(&mdsc->mutex);
3708 }
f3c60c59
SW		 3709 mutex_unlock(&mdsc->mutex);
3710
3711 dout("waiting for sessions to close\n");
fcff415c
YZ		 3712 wait_event_timeout(mdsc->session_close_wq,
3713 done_closing_sessions(mdsc, skipped),
a319bf56 3714 ceph_timeout_jiffies(opts->mount_timeout));
2f2dc053
SW		 3715
3716 /* tear down remaining sessions */
f3c60c59 3717 mutex_lock(&mdsc->mutex);
2f2dc053
SW		 3718 for (i = 0; i < mdsc->max_sessions; i++) {
3719 if (mdsc->sessions[i]) {
3720 session = get_session(mdsc->sessions[i]);
2600d2dd 3721 __unregister_session(mdsc, session);
2f2dc053
SW		 3722 mutex_unlock(&mdsc->mutex);
3723 mutex_lock(&session->s_mutex);
3724 remove_session_caps(session);
3725 mutex_unlock(&session->s_mutex);
3726 ceph_put_mds_session(session);
3727 mutex_lock(&mdsc->mutex);
3728 }
3729 }
2f2dc053 3730 WARN_ON(!list_empty(&mdsc->cap_delay_list));
2f2dc053
SW		 3731 mutex_unlock(&mdsc->mutex);
3732
3733 ceph_cleanup_empty_realms(mdsc);
3734
3735 cancel_delayed_work_sync(&mdsc->delayed_work); /* cancel timer */
3736
3737 dout("stopped\n");
3738}
3739
48fec5d0
YZ		 3740void ceph_mdsc_force_umount(struct ceph_mds_client *mdsc)
3741{
3742 struct ceph_mds_session *session;
3743 int mds;
3744
3745 dout("force umount\n");
3746
3747 mutex_lock(&mdsc->mutex);
3748 for (mds = 0; mds < mdsc->max_sessions; mds++) {
3749 session = __ceph_lookup_mds_session(mdsc, mds);
3750 if (!session)
3751 continue;
3752 mutex_unlock(&mdsc->mutex);
3753 mutex_lock(&session->s_mutex);
3754 __close_session(mdsc, session);
3755 if (session->s_state == CEPH_MDS_SESSION_CLOSING) {
3756 cleanup_session_requests(mdsc, session);
3757 remove_session_caps(session);
3758 }
3759 mutex_unlock(&session->s_mutex);
3760 ceph_put_mds_session(session);
3761 mutex_lock(&mdsc->mutex);
3762 kick_requests(mdsc, mds);
3763 }
3764 __wake_requests(mdsc, &mdsc->waiting_for_map);
3765 mutex_unlock(&mdsc->mutex);
3766}
3767
3d14c5d2 3768static void ceph_mdsc_stop(struct ceph_mds_client *mdsc)
2f2dc053
SW		 3769{
3770 dout("stop\n");
3771 cancel_delayed_work_sync(&mdsc->delayed_work); /* cancel timer */
3772 if (mdsc->mdsmap)
3773 ceph_mdsmap_destroy(mdsc->mdsmap);
3774 kfree(mdsc->sessions);
37151668 3775 ceph_caps_finalize(mdsc);
10183a69 3776 ceph_pool_perm_destroy(mdsc);
2f2dc053
SW		 3777}
3778
3d14c5d2
YS		 3779void ceph_mdsc_destroy(struct ceph_fs_client *fsc)
3780{
3781 struct ceph_mds_client *mdsc = fsc->mdsc;
ef550f6f 3782 dout("mdsc_destroy %p\n", mdsc);
ef550f6f
SW		 3783
3784 /* flush out any connection work with references to us */
3785 ceph_msgr_flush();
3786
62a65f36
YZ		 3787 ceph_mdsc_stop(mdsc);
3788
3d14c5d2
YS		 3789 fsc->mdsc = NULL;
3790 kfree(mdsc);
ef550f6f 3791 dout("mdsc_destroy %p done\n", mdsc);
3d14c5d2
YS		 3792}
3793
430afbad
YZ		 3794void ceph_mdsc_handle_fsmap(struct ceph_mds_client *mdsc, struct ceph_msg *msg)
3795{
3796 struct ceph_fs_client *fsc = mdsc->fsc;
3797 const char *mds_namespace = fsc->mount_options->mds_namespace;
3798 void *p = msg->front.iov_base;
3799 void *end = p + msg->front.iov_len;
3800 u32 epoch;
3801 u32 map_len;
3802 u32 num_fs;
3803 u32 mount_fscid = (u32)-1;
3804 u8 struct_v, struct_cv;
3805 int err = -EINVAL;
3806
3807 ceph_decode_need(&p, end, sizeof(u32), bad);
3808 epoch = ceph_decode_32(&p);
3809
3810 dout("handle_fsmap epoch %u\n", epoch);
3811
3812 ceph_decode_need(&p, end, 2 + sizeof(u32), bad);
3813 struct_v = ceph_decode_8(&p);
3814 struct_cv = ceph_decode_8(&p);
3815 map_len = ceph_decode_32(&p);
3816
3817 ceph_decode_need(&p, end, sizeof(u32) * 3, bad);
3818 p += sizeof(u32) * 2; /* skip epoch and legacy_client_fscid */
3819
3820 num_fs = ceph_decode_32(&p);
3821 while (num_fs-- > 0) {
3822 void *info_p, *info_end;
3823 u32 info_len;
3824 u8 info_v, info_cv;
3825 u32 fscid, namelen;
3826
3827 ceph_decode_need(&p, end, 2 + sizeof(u32), bad);
3828 info_v = ceph_decode_8(&p);
3829 info_cv = ceph_decode_8(&p);
3830 info_len = ceph_decode_32(&p);
3831 ceph_decode_need(&p, end, info_len, bad);
3832 info_p = p;
3833 info_end = p + info_len;
3834 p = info_end;
3835
3836 ceph_decode_need(&info_p, info_end, sizeof(u32) * 2, bad);
3837 fscid = ceph_decode_32(&info_p);
3838 namelen = ceph_decode_32(&info_p);
3839 ceph_decode_need(&info_p, info_end, namelen, bad);
3840
3841 if (mds_namespace &&
3842 strlen(mds_namespace) == namelen &&
3843 !strncmp(mds_namespace, (char *)info_p, namelen)) {
3844 mount_fscid = fscid;
3845 break;
3846 }
3847 }
3848
3849 ceph_monc_got_map(&fsc->client->monc, CEPH_SUB_FSMAP, epoch);
3850 if (mount_fscid != (u32)-1) {
3851 fsc->client->monc.fs_cluster_id = mount_fscid;
3852 ceph_monc_want_map(&fsc->client->monc, CEPH_SUB_MDSMAP,
3853 0, true);
3854 ceph_monc_renew_subs(&fsc->client->monc);
3855 } else {
3856 err = -ENOENT;
3857 goto err_out;
3858 }
3859 return;
3860bad:
3861 pr_err("error decoding fsmap\n");
3862err_out:
3863 mutex_lock(&mdsc->mutex);
3864 mdsc->mdsmap_err = -ENOENT;
3865 __wake_requests(mdsc, &mdsc->waiting_for_map);
3866 mutex_unlock(&mdsc->mutex);
3867 return;
3868}
2f2dc053
SW		 3869
3870/*
3871 * handle mds map update.
3872 */
430afbad 3873void ceph_mdsc_handle_mdsmap(struct ceph_mds_client *mdsc, struct ceph_msg *msg)
2f2dc053
SW		 3874{
3875 u32 epoch;
3876 u32 maplen;
3877 void *p = msg->front.iov_base;
3878 void *end = p + msg->front.iov_len;
3879 struct ceph_mdsmap *newmap, *oldmap;
3880 struct ceph_fsid fsid;
3881 int err = -EINVAL;
3882
3883 ceph_decode_need(&p, end, sizeof(fsid)+2*sizeof(u32), bad);
3884 ceph_decode_copy(&p, &fsid, sizeof(fsid));
3d14c5d2 3885 if (ceph_check_fsid(mdsc->fsc->client, &fsid) < 0)
0743304d 3886 return;
c89136ea
SW		 3887 epoch = ceph_decode_32(&p);
3888 maplen = ceph_decode_32(&p);
2f2dc053
SW		 3889 dout("handle_map epoch %u len %d\n", epoch, (int)maplen);
3890
3891 /* do we need it? */
2f2dc053
SW		 3892 mutex_lock(&mdsc->mutex);
3893 if (mdsc->mdsmap && epoch <= mdsc->mdsmap->m_epoch) {
3894 dout("handle_map epoch %u <= our %u\n",
3895 epoch, mdsc->mdsmap->m_epoch);
3896 mutex_unlock(&mdsc->mutex);
3897 return;
3898 }
3899
3900 newmap = ceph_mdsmap_decode(&p, end);
3901 if (IS_ERR(newmap)) {
3902 err = PTR_ERR(newmap);
3903 goto bad_unlock;
3904 }
3905
3906 /* swap into place */
3907 if (mdsc->mdsmap) {
3908 oldmap = mdsc->mdsmap;
3909 mdsc->mdsmap = newmap;
3910 check_new_map(mdsc, newmap, oldmap);
3911 ceph_mdsmap_destroy(oldmap);
3912 } else {
3913 mdsc->mdsmap = newmap; /* first mds map */
3914 }
3d14c5d2 3915 mdsc->fsc->sb->s_maxbytes = mdsc->mdsmap->m_max_file_size;
2f2dc053
SW		 3916
3917 __wake_requests(mdsc, &mdsc->waiting_for_map);
82dcabad
ID		 3918 ceph_monc_got_map(&mdsc->fsc->client->monc, CEPH_SUB_MDSMAP,
3919 mdsc->mdsmap->m_epoch);
2f2dc053
SW		 3920
3921 mutex_unlock(&mdsc->mutex);
3922 schedule_delayed(mdsc);
3923 return;
3924
3925bad_unlock:
3926 mutex_unlock(&mdsc->mutex);
3927bad:
3928 pr_err("error decoding mdsmap %d\n", err);
3929 return;
3930}
3931
3932static struct ceph_connection *con_get(struct ceph_connection *con)
3933{
3934 struct ceph_mds_session *s = con->private;
3935
3936 if (get_session(s)) {
3997c01d 3937 dout("mdsc con_get %p ok (%d)\n", s, refcount_read(&s->s_ref));
2f2dc053
SW		 3938 return con;
3939 }
3940 dout("mdsc con_get %p FAIL\n", s);
3941 return NULL;
3942}
3943
3944static void con_put(struct ceph_connection *con)
3945{
3946 struct ceph_mds_session *s = con->private;
3947
3997c01d 3948 dout("mdsc con_put %p (%d)\n", s, refcount_read(&s->s_ref) - 1);
2f2dc053
SW		 3949 ceph_put_mds_session(s);
3950}
3951
3952/*
3953 * if the client is unresponsive for long enough, the mds will kill
3954 * the session entirely.
3955 */
3956static void peer_reset(struct ceph_connection *con)
3957{
3958 struct ceph_mds_session *s = con->private;
7e70f0ed 3959 struct ceph_mds_client *mdsc = s->s_mdsc;
2f2dc053 3960
f3ae1b97 3961 pr_warn("mds%d closed our session\n", s->s_mds);
7e70f0ed 3962 send_mds_reconnect(mdsc, s);
2f2dc053
SW		 3963}
3964
3965static void dispatch(struct ceph_connection *con, struct ceph_msg *msg)
3966{
3967 struct ceph_mds_session *s = con->private;
3968 struct ceph_mds_client *mdsc = s->s_mdsc;
3969 int type = le16_to_cpu(msg->hdr.type);
3970
2600d2dd
SW		 3971 mutex_lock(&mdsc->mutex);
3972 if (__verify_registered_session(mdsc, s) < 0) {
3973 mutex_unlock(&mdsc->mutex);
3974 goto out;
3975 }
3976 mutex_unlock(&mdsc->mutex);
3977
2f2dc053
SW		 3978 switch (type) {
3979 case CEPH_MSG_MDS_MAP:
430afbad
YZ		 3980 ceph_mdsc_handle_mdsmap(mdsc, msg);
3981 break;
3982 case CEPH_MSG_FS_MAP_USER:
3983 ceph_mdsc_handle_fsmap(mdsc, msg);
2f2dc053
SW		 3984 break;
3985 case CEPH_MSG_CLIENT_SESSION:
3986 handle_session(s, msg);
3987 break;
3988 case CEPH_MSG_CLIENT_REPLY:
3989 handle_reply(s, msg);
3990 break;
3991 case CEPH_MSG_CLIENT_REQUEST_FORWARD:
2600d2dd 3992 handle_forward(mdsc, s, msg);
2f2dc053
SW		 3993 break;
3994 case CEPH_MSG_CLIENT_CAPS:
3995 ceph_handle_caps(s, msg);
3996 break;
3997 case CEPH_MSG_CLIENT_SNAP:
2600d2dd 3998 ceph_handle_snap(mdsc, s, msg);
2f2dc053
SW		 3999 break;
4000 case CEPH_MSG_CLIENT_LEASE:
2600d2dd 4001 handle_lease(mdsc, s, msg);
2f2dc053
SW		 4002 break;
4003
4004 default:
4005 pr_err("received unknown message type %d %s\n", type,
4006 ceph_msg_type_name(type));
4007 }
2600d2dd 4008out:
2f2dc053
SW		 4009 ceph_msg_put(msg);
4010}
4011
4e7a5dcd
SW		 4012/*
4013 * authentication
4014 */
a3530df3
AE		 4015
4016/*
4017 * Note: returned pointer is the address of a structure that's
4018 * managed separately. Caller must *not* attempt to free it.
4019 */
4020static struct ceph_auth_handshake *get_authorizer(struct ceph_connection *con,
8f43fb53 4021 int *proto, int force_new)
4e7a5dcd
SW		 4022{
4023 struct ceph_mds_session *s = con->private;
4024 struct ceph_mds_client *mdsc = s->s_mdsc;
3d14c5d2 4025 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
74f1869f 4026 struct ceph_auth_handshake *auth = &s->s_auth;
4e7a5dcd 4027
74f1869f 4028 if (force_new && auth->authorizer) {
6c1ea260 4029 ceph_auth_destroy_authorizer(auth->authorizer);
74f1869f 4030 auth->authorizer = NULL;
4e7a5dcd 4031 }
27859f97
SW		 4032 if (!auth->authorizer) {
4033 int ret = ceph_auth_create_authorizer(ac, CEPH_ENTITY_TYPE_MDS,
4034 auth);
0bed9b5c
SW		 4035 if (ret)
4036 return ERR_PTR(ret);
27859f97
SW		 4037 } else {
4038 int ret = ceph_auth_update_authorizer(ac, CEPH_ENTITY_TYPE_MDS,
4039 auth);
a255651d 4040 if (ret)
a3530df3 4041 return ERR_PTR(ret);
4e7a5dcd 4042 }
4e7a5dcd 4043 *proto = ac->protocol;
74f1869f 4044
a3530df3 4045 return auth;
4e7a5dcd
SW		 4046}
4047
4048
0dde5848 4049static int verify_authorizer_reply(struct ceph_connection *con)
4e7a5dcd
SW		 4050{
4051 struct ceph_mds_session *s = con->private;
4052 struct ceph_mds_client *mdsc = s->s_mdsc;
3d14c5d2 4053 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
4e7a5dcd 4054
0dde5848 4055 return ceph_auth_verify_authorizer_reply(ac, s->s_auth.authorizer);
4e7a5dcd
SW		 4056}
4057
9bd2e6f8
SW		 4058static int invalidate_authorizer(struct ceph_connection *con)
4059{
4060 struct ceph_mds_session *s = con->private;
4061 struct ceph_mds_client *mdsc = s->s_mdsc;
3d14c5d2 4062 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
9bd2e6f8 4063
27859f97 4064 ceph_auth_invalidate_authorizer(ac, CEPH_ENTITY_TYPE_MDS);
9bd2e6f8 4065
3d14c5d2 4066 return ceph_monc_validate_auth(&mdsc->fsc->client->monc);
9bd2e6f8
SW		 4067}
4068
53ded495
AE		 4069static struct ceph_msg *mds_alloc_msg(struct ceph_connection *con,
4070 struct ceph_msg_header *hdr, int *skip)
4071{
4072 struct ceph_msg *msg;
4073 int type = (int) le16_to_cpu(hdr->type);
4074 int front_len = (int) le32_to_cpu(hdr->front_len);
4075
4076 if (con->in_msg)
4077 return con->in_msg;
4078
4079 *skip = 0;
4080 msg = ceph_msg_new(type, front_len, GFP_NOFS, false);
4081 if (!msg) {
4082 pr_err("unable to allocate msg type %d len %d\n",
4083 type, front_len);
4084 return NULL;
4085 }
53ded495
AE		 4086
4087 return msg;
4088}
4089
79dbd1ba 4090static int mds_sign_message(struct ceph_msg *msg)
33d07337 4091{
79dbd1ba 4092 struct ceph_mds_session *s = msg->con->private;
33d07337 4093 struct ceph_auth_handshake *auth = &s->s_auth;
79dbd1ba 4094
33d07337
YZ		 4095 return ceph_auth_sign_message(auth, msg);
4096}
4097
79dbd1ba 4098static int mds_check_message_signature(struct ceph_msg *msg)
33d07337 4099{
79dbd1ba 4100 struct ceph_mds_session *s = msg->con->private;
33d07337 4101 struct ceph_auth_handshake *auth = &s->s_auth;
79dbd1ba 4102
33d07337
YZ		 4103 return ceph_auth_check_message_signature(auth, msg);
4104}
4105
9e32789f 4106static const struct ceph_connection_operations mds_con_ops = {
2f2dc053
SW		 4107 .get = con_get,
4108 .put = con_put,
4109 .dispatch = dispatch,
4e7a5dcd
SW		 4110 .get_authorizer = get_authorizer,
4111 .verify_authorizer_reply = verify_authorizer_reply,
9bd2e6f8 4112 .invalidate_authorizer = invalidate_authorizer,
2f2dc053 4113 .peer_reset = peer_reset,
53ded495 4114 .alloc_msg = mds_alloc_msg,
79dbd1ba
ID		 4115 .sign_message = mds_sign_message,
4116 .check_message_signature = mds_check_message_signature,
2f2dc053
SW		 4117};
4118
2f2dc053 4119/* eof */
Linux 6.x block layer and io_uring tree(s)