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ceph: don't use ->d_time
[linux-2.6-block.git] / fs / ceph / mds_client.c
CommitLineData
3d14c5d2 1#include <linux/ceph/ceph_debug.h>
2f2dc053 2
496e5955 3#include <linux/fs.h>
2f2dc053 4#include <linux/wait.h>
5a0e3ad6 5#include <linux/slab.h>
54008399 6#include <linux/gfp.h>
2f2dc053 7#include <linux/sched.h>
3d14c5d2
YS		 8#include <linux/debugfs.h>
9#include <linux/seq_file.h>
dbd0c8bf 10#include <linux/utsname.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45 * are no longer valid.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
SW		 50 struct ceph_pagelist *pagelist;
51 bool flock;
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);
956d39d6 192 }
2f2dc053
SW		 193 if (num == 0)
194 goto done;
195
2a5beea3
YZ		 196 BUG_ON(!info->dir_entries);
197 if ((unsigned long)(info->dir_entries + num) >
198 (unsigned long)info->dir_entries + info->dir_buf_size) {
54008399
YZ		 199 pr_err("dir contents are larger than expected\n");
200 WARN_ON(1);
201 goto bad;
202 }
2f2dc053 203
54008399 204 info->dir_nr = num;
2f2dc053 205 while (num) {
2a5beea3 206 struct ceph_mds_reply_dir_entry *rde = info->dir_entries + i;
2f2dc053
SW		 207 /* dentry */
208 ceph_decode_need(p, end, sizeof(u32)*2, bad);
2a5beea3
YZ		 209 rde->name_len = ceph_decode_32(p);
210 ceph_decode_need(p, end, rde->name_len, bad);
211 rde->name = *p;
212 *p += rde->name_len;
213 dout("parsed dir dname '%.*s'\n", rde->name_len, rde->name);
214 rde->lease = *p;
2f2dc053
SW		 215 *p += sizeof(struct ceph_mds_reply_lease);
216
217 /* inode */
2a5beea3 218 err = parse_reply_info_in(p, end, &rde->inode, features);
2f2dc053
SW		 219 if (err < 0)
220 goto out_bad;
8974eebd
YZ		 221 /* ceph_readdir_prepopulate() will update it */
222 rde->offset = 0;
2f2dc053
SW		 223 i++;
224 num--;
225 }
226
227done:
228 if (*p != end)
229 goto bad;
230 return 0;
231
232bad:
233 err = -EIO;
234out_bad:
235 pr_err("problem parsing dir contents %d\n", err);
236 return err;
237}
238
25933abd
HS		 239/*
240 * parse fcntl F_GETLK results
241 */
242static int parse_reply_info_filelock(void **p, void *end,
14303d20 243 struct ceph_mds_reply_info_parsed *info,
12b4629a 244 u64 features)
25933abd
HS		 245{
246 if (*p + sizeof(*info->filelock_reply) > end)
247 goto bad;
248
249 info->filelock_reply = *p;
250 *p += sizeof(*info->filelock_reply);
251
252 if (unlikely(*p != end))
253 goto bad;
254 return 0;
255
256bad:
257 return -EIO;
258}
259
6e8575fa
SL		 260/*
261 * parse create results
262 */
263static int parse_reply_info_create(void **p, void *end,
264 struct ceph_mds_reply_info_parsed *info,
12b4629a 265 u64 features)
6e8575fa
SL		 266{
267 if (features & CEPH_FEATURE_REPLY_CREATE_INODE) {
268 if (*p == end) {
269 info->has_create_ino = false;
270 } else {
271 info->has_create_ino = true;
272 info->ino = ceph_decode_64(p);
273 }
274 }
275
276 if (unlikely(*p != end))
277 goto bad;
278 return 0;
279
280bad:
281 return -EIO;
282}
283
25933abd
HS		 284/*
285 * parse extra results
286 */
287static int parse_reply_info_extra(void **p, void *end,
14303d20 288 struct ceph_mds_reply_info_parsed *info,
12b4629a 289 u64 features)
25933abd
HS		 290{
291 if (info->head->op == CEPH_MDS_OP_GETFILELOCK)
14303d20 292 return parse_reply_info_filelock(p, end, info, features);
8a034497
YZ		 293 else if (info->head->op == CEPH_MDS_OP_READDIR ||
294 info->head->op == CEPH_MDS_OP_LSSNAP)
14303d20 295 return parse_reply_info_dir(p, end, info, features);
6e8575fa
SL		 296 else if (info->head->op == CEPH_MDS_OP_CREATE)
297 return parse_reply_info_create(p, end, info, features);
298 else
299 return -EIO;
25933abd
HS		 300}
301
2f2dc053
SW		 302/*
303 * parse entire mds reply
304 */
305static int parse_reply_info(struct ceph_msg *msg,
14303d20 306 struct ceph_mds_reply_info_parsed *info,
12b4629a 307 u64 features)
2f2dc053
SW		 308{
309 void *p, *end;
310 u32 len;
311 int err;
312
313 info->head = msg->front.iov_base;
314 p = msg->front.iov_base + sizeof(struct ceph_mds_reply_head);
315 end = p + msg->front.iov_len - sizeof(struct ceph_mds_reply_head);
316
317 /* trace */
318 ceph_decode_32_safe(&p, end, len, bad);
319 if (len > 0) {
32852a81 320 ceph_decode_need(&p, end, len, bad);
14303d20 321 err = parse_reply_info_trace(&p, p+len, info, features);
2f2dc053
SW		 322 if (err < 0)
323 goto out_bad;
324 }
325
25933abd 326 /* extra */
2f2dc053
SW		 327 ceph_decode_32_safe(&p, end, len, bad);
328 if (len > 0) {
32852a81 329 ceph_decode_need(&p, end, len, bad);
14303d20 330 err = parse_reply_info_extra(&p, p+len, info, features);
2f2dc053
SW		 331 if (err < 0)
332 goto out_bad;
333 }
334
335 /* snap blob */
336 ceph_decode_32_safe(&p, end, len, bad);
337 info->snapblob_len = len;
338 info->snapblob = p;
339 p += len;
340
341 if (p != end)
342 goto bad;
343 return 0;
344
345bad:
346 err = -EIO;
347out_bad:
348 pr_err("mds parse_reply err %d\n", err);
349 return err;
350}
351
352static void destroy_reply_info(struct ceph_mds_reply_info_parsed *info)
353{
2a5beea3 354 if (!info->dir_entries)
54008399 355 return;
2a5beea3 356 free_pages((unsigned long)info->dir_entries, get_order(info->dir_buf_size));
2f2dc053
SW		 357}
358
359
360/*
361 * sessions
362 */
a687ecaf 363const char *ceph_session_state_name(int s)
2f2dc053
SW		 364{
365 switch (s) {
366 case CEPH_MDS_SESSION_NEW: return "new";
367 case CEPH_MDS_SESSION_OPENING: return "opening";
368 case CEPH_MDS_SESSION_OPEN: return "open";
369 case CEPH_MDS_SESSION_HUNG: return "hung";
370 case CEPH_MDS_SESSION_CLOSING: return "closing";
44ca18f2 371 case CEPH_MDS_SESSION_RESTARTING: return "restarting";
2f2dc053
SW		 372 case CEPH_MDS_SESSION_RECONNECTING: return "reconnecting";
373 default: return "???";
374 }
375}
376
377static struct ceph_mds_session *get_session(struct ceph_mds_session *s)
378{
379 if (atomic_inc_not_zero(&s->s_ref)) {
380 dout("mdsc get_session %p %d -> %d\n", s,
381 atomic_read(&s->s_ref)-1, atomic_read(&s->s_ref));
382 return s;
383 } else {
384 dout("mdsc get_session %p 0 -- FAIL", s);
385 return NULL;
386 }
387}
388
389void ceph_put_mds_session(struct ceph_mds_session *s)
390{
391 dout("mdsc put_session %p %d -> %d\n", s,
392 atomic_read(&s->s_ref), atomic_read(&s->s_ref)-1);
4e7a5dcd 393 if (atomic_dec_and_test(&s->s_ref)) {
6c4a1915 394 if (s->s_auth.authorizer)
6c1ea260 395 ceph_auth_destroy_authorizer(s->s_auth.authorizer);
2f2dc053 396 kfree(s);
4e7a5dcd 397 }
2f2dc053
SW		 398}
399
400/*
401 * called under mdsc->mutex
402 */
403struct ceph_mds_session *__ceph_lookup_mds_session(struct ceph_mds_client *mdsc,
404 int mds)
405{
406 struct ceph_mds_session *session;
407
408 if (mds >= mdsc->max_sessions || mdsc->sessions[mds] == NULL)
409 return NULL;
410 session = mdsc->sessions[mds];
411 dout("lookup_mds_session %p %d\n", session,
412 atomic_read(&session->s_ref));
413 get_session(session);
414 return session;
415}
416
417static bool __have_session(struct ceph_mds_client *mdsc, int mds)
418{
419 if (mds >= mdsc->max_sessions)
420 return false;
421 return mdsc->sessions[mds];
422}
423
2600d2dd
SW		 424static int __verify_registered_session(struct ceph_mds_client *mdsc,
425 struct ceph_mds_session *s)
426{
427 if (s->s_mds >= mdsc->max_sessions ||
428 mdsc->sessions[s->s_mds] != s)
429 return -ENOENT;
430 return 0;
431}
432
2f2dc053
SW		 433/*
434 * create+register a new session for given mds.
435 * called under mdsc->mutex.
436 */
437static struct ceph_mds_session *register_session(struct ceph_mds_client *mdsc,
438 int mds)
439{
440 struct ceph_mds_session *s;
441
c338c07c
NY		 442 if (mds >= mdsc->mdsmap->m_max_mds)
443 return ERR_PTR(-EINVAL);
444
2f2dc053 445 s = kzalloc(sizeof(*s), GFP_NOFS);
4736b009
DC		 446 if (!s)
447 return ERR_PTR(-ENOMEM);
2f2dc053
SW		 448 s->s_mdsc = mdsc;
449 s->s_mds = mds;
450 s->s_state = CEPH_MDS_SESSION_NEW;
451 s->s_ttl = 0;
452 s->s_seq = 0;
453 mutex_init(&s->s_mutex);
454
b7a9e5dd 455 ceph_con_init(&s->s_con, s, &mds_con_ops, &mdsc->fsc->client->msgr);
2f2dc053 456
d8fb02ab 457 spin_lock_init(&s->s_gen_ttl_lock);
2f2dc053 458 s->s_cap_gen = 0;
1ce208a6 459 s->s_cap_ttl = jiffies - 1;
d8fb02ab
AE		 460
461 spin_lock_init(&s->s_cap_lock);
2f2dc053
SW		 462 s->s_renew_requested = 0;
463 s->s_renew_seq = 0;
464 INIT_LIST_HEAD(&s->s_caps);
465 s->s_nr_caps = 0;
5dacf091 466 s->s_trim_caps = 0;
2f2dc053
SW		 467 atomic_set(&s->s_ref, 1);
468 INIT_LIST_HEAD(&s->s_waiting);
469 INIT_LIST_HEAD(&s->s_unsafe);
470 s->s_num_cap_releases = 0;
99a9c273 471 s->s_cap_reconnect = 0;
7c1332b8 472 s->s_cap_iterator = NULL;
2f2dc053 473 INIT_LIST_HEAD(&s->s_cap_releases);
2f2dc053
SW		 474 INIT_LIST_HEAD(&s->s_cap_flushing);
475 INIT_LIST_HEAD(&s->s_cap_snaps_flushing);
476
477 dout("register_session mds%d\n", mds);
478 if (mds >= mdsc->max_sessions) {
479 int newmax = 1 << get_count_order(mds+1);
480 struct ceph_mds_session **sa;
481
482 dout("register_session realloc to %d\n", newmax);
483 sa = kcalloc(newmax, sizeof(void *), GFP_NOFS);
484 if (sa == NULL)
42ce56e5 485 goto fail_realloc;
2f2dc053
SW		 486 if (mdsc->sessions) {
487 memcpy(sa, mdsc->sessions,
488 mdsc->max_sessions * sizeof(void *));
489 kfree(mdsc->sessions);
490 }
491 mdsc->sessions = sa;
492 mdsc->max_sessions = newmax;
493 }
494 mdsc->sessions[mds] = s;
86d8f67b 495 atomic_inc(&mdsc->num_sessions);
2f2dc053 496 atomic_inc(&s->s_ref); /* one ref to sessions[], one to caller */
42ce56e5 497
b7a9e5dd
SW		 498 ceph_con_open(&s->s_con, CEPH_ENTITY_TYPE_MDS, mds,
499 ceph_mdsmap_get_addr(mdsc->mdsmap, mds));
42ce56e5 500
2f2dc053 501 return s;
42ce56e5
SW		 502
503fail_realloc:
504 kfree(s);
505 return ERR_PTR(-ENOMEM);
2f2dc053
SW		 506}
507
508/*
509 * called under mdsc->mutex
510 */
2600d2dd 511static void __unregister_session(struct ceph_mds_client *mdsc,
42ce56e5 512 struct ceph_mds_session *s)
2f2dc053 513{
2600d2dd
SW		 514 dout("__unregister_session mds%d %p\n", s->s_mds, s);
515 BUG_ON(mdsc->sessions[s->s_mds] != s);
42ce56e5
SW		 516 mdsc->sessions[s->s_mds] = NULL;
517 ceph_con_close(&s->s_con);
518 ceph_put_mds_session(s);
86d8f67b 519 atomic_dec(&mdsc->num_sessions);
2f2dc053
SW		 520}
521
522/*
523 * drop session refs in request.
524 *
525 * should be last request ref, or hold mdsc->mutex
526 */
527static void put_request_session(struct ceph_mds_request *req)
528{
529 if (req->r_session) {
530 ceph_put_mds_session(req->r_session);
531 req->r_session = NULL;
532 }
533}
534
153c8e6b 535void ceph_mdsc_release_request(struct kref *kref)
2f2dc053 536{
153c8e6b
SW		 537 struct ceph_mds_request *req = container_of(kref,
538 struct ceph_mds_request,
539 r_kref);
54008399 540 destroy_reply_info(&req->r_reply_info);
153c8e6b
SW		 541 if (req->r_request)
542 ceph_msg_put(req->r_request);
54008399 543 if (req->r_reply)
153c8e6b 544 ceph_msg_put(req->r_reply);
153c8e6b 545 if (req->r_inode) {
41b02e1f 546 ceph_put_cap_refs(ceph_inode(req->r_inode), CEPH_CAP_PIN);
153c8e6b
SW		 547 iput(req->r_inode);
548 }
549 if (req->r_locked_dir)
41b02e1f 550 ceph_put_cap_refs(ceph_inode(req->r_locked_dir), CEPH_CAP_PIN);
e96a650a 551 iput(req->r_target_inode);
153c8e6b
SW		 552 if (req->r_dentry)
553 dput(req->r_dentry);
844d87c3
SW		 554 if (req->r_old_dentry)
555 dput(req->r_old_dentry);
556 if (req->r_old_dentry_dir) {
41b02e1f
SW		 557 /*
558 * track (and drop pins for) r_old_dentry_dir
559 * separately, since r_old_dentry's d_parent may have
560 * changed between the dir mutex being dropped and
561 * this request being freed.
562 */
563 ceph_put_cap_refs(ceph_inode(req->r_old_dentry_dir),
564 CEPH_CAP_PIN);
41b02e1f 565 iput(req->r_old_dentry_dir);
2f2dc053 566 }
153c8e6b
SW		 567 kfree(req->r_path1);
568 kfree(req->r_path2);
25e6bae3
YZ		 569 if (req->r_pagelist)
570 ceph_pagelist_release(req->r_pagelist);
153c8e6b 571 put_request_session(req);
37151668 572 ceph_unreserve_caps(req->r_mdsc, &req->r_caps_reservation);
153c8e6b 573 kfree(req);
2f2dc053
SW		 574}
575
fcd00b68
ID		 576DEFINE_RB_FUNCS(request, struct ceph_mds_request, r_tid, r_node)
577
2f2dc053
SW		 578/*
579 * lookup session, bump ref if found.
580 *
581 * called under mdsc->mutex.
582 */
fcd00b68
ID		 583static struct ceph_mds_request *
584lookup_get_request(struct ceph_mds_client *mdsc, u64 tid)
2f2dc053
SW		 585{
586 struct ceph_mds_request *req;
44ca18f2 587
fcd00b68
ID		 588 req = lookup_request(&mdsc->request_tree, tid);
589 if (req)
590 ceph_mdsc_get_request(req);
44ca18f2 591
fcd00b68 592 return req;
2f2dc053
SW		 593}
594
595/*
596 * Register an in-flight request, and assign a tid. Link to directory
597 * are modifying (if any).
598 *
599 * Called under mdsc->mutex.
600 */
601static void __register_request(struct ceph_mds_client *mdsc,
602 struct ceph_mds_request *req,
603 struct inode *dir)
604{
605 req->r_tid = ++mdsc->last_tid;
606 if (req->r_num_caps)
37151668
YS		 607 ceph_reserve_caps(mdsc, &req->r_caps_reservation,
608 req->r_num_caps);
2f2dc053
SW		 609 dout("__register_request %p tid %lld\n", req, req->r_tid);
610 ceph_mdsc_get_request(req);
fcd00b68 611 insert_request(&mdsc->request_tree, req);
2f2dc053 612
cb4276cc
SW		 613 req->r_uid = current_fsuid();
614 req->r_gid = current_fsgid();
615
e8a7b8b1
YZ		 616 if (mdsc->oldest_tid == 0 && req->r_op != CEPH_MDS_OP_SETFILELOCK)
617 mdsc->oldest_tid = req->r_tid;
618
2f2dc053 619 if (dir) {
3b663780 620 ihold(dir);
2f2dc053 621 req->r_unsafe_dir = dir;
2f2dc053
SW		 622 }
623}
624
625static void __unregister_request(struct ceph_mds_client *mdsc,
626 struct ceph_mds_request *req)
627{
628 dout("__unregister_request %p tid %lld\n", req, req->r_tid);
e8a7b8b1
YZ		 629
630 if (req->r_tid == mdsc->oldest_tid) {
631 struct rb_node *p = rb_next(&req->r_node);
632 mdsc->oldest_tid = 0;
633 while (p) {
634 struct ceph_mds_request *next_req =
635 rb_entry(p, struct ceph_mds_request, r_node);
636 if (next_req->r_op != CEPH_MDS_OP_SETFILELOCK) {
637 mdsc->oldest_tid = next_req->r_tid;
638 break;
639 }
640 p = rb_next(p);
641 }
642 }
643
fcd00b68 644 erase_request(&mdsc->request_tree, req);
2f2dc053 645
4c06ace8 646 if (req->r_unsafe_dir && req->r_got_unsafe) {
2f2dc053 647 struct ceph_inode_info *ci = ceph_inode(req->r_unsafe_dir);
2f2dc053
SW		 648 spin_lock(&ci->i_unsafe_lock);
649 list_del_init(&req->r_unsafe_dir_item);
650 spin_unlock(&ci->i_unsafe_lock);
4c06ace8 651 }
68cd5b4b
YZ		 652 if (req->r_target_inode && req->r_got_unsafe) {
653 struct ceph_inode_info *ci = ceph_inode(req->r_target_inode);
654 spin_lock(&ci->i_unsafe_lock);
655 list_del_init(&req->r_unsafe_target_item);
656 spin_unlock(&ci->i_unsafe_lock);
657 }
3b663780 658
4c06ace8 659 if (req->r_unsafe_dir) {
3b663780
SW		 660 iput(req->r_unsafe_dir);
661 req->r_unsafe_dir = NULL;
2f2dc053 662 }
94aa8ae1 663
fc55d2c9
YZ		 664 complete_all(&req->r_safe_completion);
665
94aa8ae1 666 ceph_mdsc_put_request(req);
2f2dc053
SW		 667}
668
669/*
670 * Choose mds to send request to next. If there is a hint set in the
671 * request (e.g., due to a prior forward hint from the mds), use that.
672 * Otherwise, consult frag tree and/or caps to identify the
673 * appropriate mds. If all else fails, choose randomly.
674 *
675 * Called under mdsc->mutex.
676 */
7fd7d101 677static struct dentry *get_nonsnap_parent(struct dentry *dentry)
eb6bb1c5 678{
d79698da
SW		 679 /*
680 * we don't need to worry about protecting the d_parent access
681 * here because we never renaming inside the snapped namespace
682 * except to resplice to another snapdir, and either the old or new
683 * result is a valid result.
684 */
2b0143b5 685 while (!IS_ROOT(dentry) && ceph_snap(d_inode(dentry)) != CEPH_NOSNAP)
eb6bb1c5
SW		 686 dentry = dentry->d_parent;
687 return dentry;
688}
689
2f2dc053
SW		 690static int __choose_mds(struct ceph_mds_client *mdsc,
691 struct ceph_mds_request *req)
692{
693 struct inode *inode;
694 struct ceph_inode_info *ci;
695 struct ceph_cap *cap;
696 int mode = req->r_direct_mode;
697 int mds = -1;
698 u32 hash = req->r_direct_hash;
699 bool is_hash = req->r_direct_is_hash;
700
701 /*
702 * is there a specific mds we should try? ignore hint if we have
703 * no session and the mds is not up (active or recovering).
704 */
705 if (req->r_resend_mds >= 0 &&
706 (__have_session(mdsc, req->r_resend_mds) ||
707 ceph_mdsmap_get_state(mdsc->mdsmap, req->r_resend_mds) > 0)) {
708 dout("choose_mds using resend_mds mds%d\n",
709 req->r_resend_mds);
710 return req->r_resend_mds;
711 }
712
713 if (mode == USE_RANDOM_MDS)
714 goto random;
715
716 inode = NULL;
717 if (req->r_inode) {
718 inode = req->r_inode;
719 } else if (req->r_dentry) {
d79698da
SW		 720 /* ignore race with rename; old or new d_parent is okay */
721 struct dentry *parent = req->r_dentry->d_parent;
2b0143b5 722 struct inode *dir = d_inode(parent);
eb6bb1c5 723
3d14c5d2 724 if (dir->i_sb != mdsc->fsc->sb) {
eb6bb1c5 725 /* not this fs! */
2b0143b5 726 inode = d_inode(req->r_dentry);
eb6bb1c5
SW		 727 } else if (ceph_snap(dir) != CEPH_NOSNAP) {
728 /* direct snapped/virtual snapdir requests
729 * based on parent dir inode */
d79698da 730 struct dentry *dn = get_nonsnap_parent(parent);
2b0143b5 731 inode = d_inode(dn);
eb6bb1c5 732 dout("__choose_mds using nonsnap parent %p\n", inode);
ca18bede 733 } else {
eb6bb1c5 734 /* dentry target */
2b0143b5 735 inode = d_inode(req->r_dentry);
ca18bede
YZ		 736 if (!inode || mode == USE_AUTH_MDS) {
737 /* dir + name */
738 inode = dir;
739 hash = ceph_dentry_hash(dir, req->r_dentry);
740 is_hash = true;
741 }
2f2dc053
SW		 742 }
743 }
eb6bb1c5 744
2f2dc053
SW		 745 dout("__choose_mds %p is_hash=%d (%d) mode %d\n", inode, (int)is_hash,
746 (int)hash, mode);
747 if (!inode)
748 goto random;
749 ci = ceph_inode(inode);
750
751 if (is_hash && S_ISDIR(inode->i_mode)) {
752 struct ceph_inode_frag frag;
753 int found;
754
755 ceph_choose_frag(ci, hash, &frag, &found);
756 if (found) {
757 if (mode == USE_ANY_MDS && frag.ndist > 0) {
758 u8 r;
759
760 /* choose a random replica */
761 get_random_bytes(&r, 1);
762 r %= frag.ndist;
763 mds = frag.dist[r];
764 dout("choose_mds %p %llx.%llx "
765 "frag %u mds%d (%d/%d)\n",
766 inode, ceph_vinop(inode),
d66bbd44 767 frag.frag, mds,
2f2dc053 768 (int)r, frag.ndist);
d66bbd44
SW		 769 if (ceph_mdsmap_get_state(mdsc->mdsmap, mds) >=
770 CEPH_MDS_STATE_ACTIVE)
771 return mds;
2f2dc053
SW		 772 }
773
774 /* since this file/dir wasn't known to be
775 * replicated, then we want to look for the
776 * authoritative mds. */
777 mode = USE_AUTH_MDS;
778 if (frag.mds >= 0) {
779 /* choose auth mds */
780 mds = frag.mds;
781 dout("choose_mds %p %llx.%llx "
782 "frag %u mds%d (auth)\n",
783 inode, ceph_vinop(inode), frag.frag, mds);
d66bbd44
SW		 784 if (ceph_mdsmap_get_state(mdsc->mdsmap, mds) >=
785 CEPH_MDS_STATE_ACTIVE)
786 return mds;
2f2dc053
SW		 787 }
788 }
789 }
790
be655596 791 spin_lock(&ci->i_ceph_lock);
2f2dc053
SW		 792 cap = NULL;
793 if (mode == USE_AUTH_MDS)
794 cap = ci->i_auth_cap;
795 if (!cap && !RB_EMPTY_ROOT(&ci->i_caps))
796 cap = rb_entry(rb_first(&ci->i_caps), struct ceph_cap, ci_node);
797 if (!cap) {
be655596 798 spin_unlock(&ci->i_ceph_lock);
2f2dc053
SW		 799 goto random;
800 }
801 mds = cap->session->s_mds;
802 dout("choose_mds %p %llx.%llx mds%d (%scap %p)\n",
803 inode, ceph_vinop(inode), mds,
804 cap == ci->i_auth_cap ? "auth " : "", cap);
be655596 805 spin_unlock(&ci->i_ceph_lock);
2f2dc053
SW		 806 return mds;
807
808random:
809 mds = ceph_mdsmap_get_random_mds(mdsc->mdsmap);
810 dout("choose_mds chose random mds%d\n", mds);
811 return mds;
812}
813
814
815/*
816 * session messages
817 */
818static struct ceph_msg *create_session_msg(u32 op, u64 seq)
819{
820 struct ceph_msg *msg;
821 struct ceph_mds_session_head *h;
822
b61c2763
SW		 823 msg = ceph_msg_new(CEPH_MSG_CLIENT_SESSION, sizeof(*h), GFP_NOFS,
824 false);
a79832f2 825 if (!msg) {
2f2dc053 826 pr_err("create_session_msg ENOMEM creating msg\n");
a79832f2 827 return NULL;
2f2dc053
SW		 828 }
829 h = msg->front.iov_base;
830 h->op = cpu_to_le32(op);
831 h->seq = cpu_to_le64(seq);
dbd0c8bf
JS		 832
833 return msg;
834}
835
836/*
837 * session message, specialization for CEPH_SESSION_REQUEST_OPEN
838 * to include additional client metadata fields.
839 */
840static struct ceph_msg *create_session_open_msg(struct ceph_mds_client *mdsc, u64 seq)
841{
842 struct ceph_msg *msg;
843 struct ceph_mds_session_head *h;
844 int i = -1;
845 int metadata_bytes = 0;
846 int metadata_key_count = 0;
847 struct ceph_options *opt = mdsc->fsc->client->options;
3f384954 848 struct ceph_mount_options *fsopt = mdsc->fsc->mount_options;
dbd0c8bf
JS		 849 void *p;
850
a6a5ce4f 851 const char* metadata[][2] = {
dbd0c8bf 852 {"hostname", utsname()->nodename},
a6a5ce4f 853 {"kernel_version", utsname()->release},
3f384954
YZ		 854 {"entity_id", opt->name ? : ""},
855 {"root", fsopt->server_path ? : "/"},
dbd0c8bf
JS		 856 {NULL, NULL}
857 };
858
859 /* Calculate serialized length of metadata */
860 metadata_bytes = 4; /* map length */
861 for (i = 0; metadata[i][0] != NULL; ++i) {
862 metadata_bytes += 8 + strlen(metadata[i][0]) +
863 strlen(metadata[i][1]);
864 metadata_key_count++;
865 }
866
867 /* Allocate the message */
868 msg = ceph_msg_new(CEPH_MSG_CLIENT_SESSION, sizeof(*h) + metadata_bytes,
869 GFP_NOFS, false);
870 if (!msg) {
871 pr_err("create_session_msg ENOMEM creating msg\n");
872 return NULL;
873 }
874 h = msg->front.iov_base;
875 h->op = cpu_to_le32(CEPH_SESSION_REQUEST_OPEN);
876 h->seq = cpu_to_le64(seq);
877
878 /*
879 * Serialize client metadata into waiting buffer space, using
880 * the format that userspace expects for map<string, string>
7cfa0313
JS		 881 *
882 * ClientSession messages with metadata are v2
dbd0c8bf 883 */
7cfa0313
JS		 884 msg->hdr.version = cpu_to_le16(2);
885 msg->hdr.compat_version = cpu_to_le16(1);
dbd0c8bf
JS		 886
887 /* The write pointer, following the session_head structure */
888 p = msg->front.iov_base + sizeof(*h);
889
890 /* Number of entries in the map */
891 ceph_encode_32(&p, metadata_key_count);
892
893 /* Two length-prefixed strings for each entry in the map */
894 for (i = 0; metadata[i][0] != NULL; ++i) {
895 size_t const key_len = strlen(metadata[i][0]);
896 size_t const val_len = strlen(metadata[i][1]);
897
898 ceph_encode_32(&p, key_len);
899 memcpy(p, metadata[i][0], key_len);
900 p += key_len;
901 ceph_encode_32(&p, val_len);
902 memcpy(p, metadata[i][1], val_len);
903 p += val_len;
904 }
905
2f2dc053
SW		 906 return msg;
907}
908
909/*
910 * send session open request.
911 *
912 * called under mdsc->mutex
913 */
914static int __open_session(struct ceph_mds_client *mdsc,
915 struct ceph_mds_session *session)
916{
917 struct ceph_msg *msg;
918 int mstate;
919 int mds = session->s_mds;
2f2dc053
SW		 920
921 /* wait for mds to go active? */
922 mstate = ceph_mdsmap_get_state(mdsc->mdsmap, mds);
923 dout("open_session to mds%d (%s)\n", mds,
924 ceph_mds_state_name(mstate));
925 session->s_state = CEPH_MDS_SESSION_OPENING;
926 session->s_renew_requested = jiffies;
927
928 /* send connect message */
dbd0c8bf 929 msg = create_session_open_msg(mdsc, session->s_seq);
a79832f2
SW		 930 if (!msg)
931 return -ENOMEM;
2f2dc053 932 ceph_con_send(&session->s_con, msg);
2f2dc053
SW		 933 return 0;
934}
935
ed0552a1
SW		 936/*
937 * open sessions for any export targets for the given mds
938 *
939 * called under mdsc->mutex
940 */
5d72d13c
YZ		 941static struct ceph_mds_session *
942__open_export_target_session(struct ceph_mds_client *mdsc, int target)
943{
944 struct ceph_mds_session *session;
945
946 session = __ceph_lookup_mds_session(mdsc, target);
947 if (!session) {
948 session = register_session(mdsc, target);
949 if (IS_ERR(session))
950 return session;
951 }
952 if (session->s_state == CEPH_MDS_SESSION_NEW ||
953 session->s_state == CEPH_MDS_SESSION_CLOSING)
954 __open_session(mdsc, session);
955
956 return session;
957}
958
959struct ceph_mds_session *
960ceph_mdsc_open_export_target_session(struct ceph_mds_client *mdsc, int target)
961{
962 struct ceph_mds_session *session;
963
964 dout("open_export_target_session to mds%d\n", target);
965
966 mutex_lock(&mdsc->mutex);
967 session = __open_export_target_session(mdsc, target);
968 mutex_unlock(&mdsc->mutex);
969
970 return session;
971}
972
ed0552a1
SW		 973static void __open_export_target_sessions(struct ceph_mds_client *mdsc,
974 struct ceph_mds_session *session)
975{
976 struct ceph_mds_info *mi;
977 struct ceph_mds_session *ts;
978 int i, mds = session->s_mds;
ed0552a1
SW		 979
980 if (mds >= mdsc->mdsmap->m_max_mds)
981 return;
5d72d13c 982
ed0552a1
SW		 983 mi = &mdsc->mdsmap->m_info[mds];
984 dout("open_export_target_sessions for mds%d (%d targets)\n",
985 session->s_mds, mi->num_export_targets);
986
987 for (i = 0; i < mi->num_export_targets; i++) {
5d72d13c
YZ		 988 ts = __open_export_target_session(mdsc, mi->export_targets[i]);
989 if (!IS_ERR(ts))
990 ceph_put_mds_session(ts);
ed0552a1
SW		 991 }
992}
993
154f42c2
SW		 994void ceph_mdsc_open_export_target_sessions(struct ceph_mds_client *mdsc,
995 struct ceph_mds_session *session)
996{
997 mutex_lock(&mdsc->mutex);
998 __open_export_target_sessions(mdsc, session);
999 mutex_unlock(&mdsc->mutex);
1000}
1001
2f2dc053
SW		 1002/*
1003 * session caps
1004 */
1005
745a8e3b
YZ		 1006/* caller holds s_cap_lock, we drop it */
1007static void cleanup_cap_releases(struct ceph_mds_client *mdsc,
1008 struct ceph_mds_session *session)
1009 __releases(session->s_cap_lock)
2f2dc053 1010{
745a8e3b
YZ		 1011 LIST_HEAD(tmp_list);
1012 list_splice_init(&session->s_cap_releases, &tmp_list);
1013 session->s_num_cap_releases = 0;
1014 spin_unlock(&session->s_cap_lock);
2f2dc053 1015
745a8e3b
YZ		 1016 dout("cleanup_cap_releases mds%d\n", session->s_mds);
1017 while (!list_empty(&tmp_list)) {
1018 struct ceph_cap *cap;
1019 /* zero out the in-progress message */
1020 cap = list_first_entry(&tmp_list,
1021 struct ceph_cap, session_caps);
1022 list_del(&cap->session_caps);
1023 ceph_put_cap(mdsc, cap);
2f2dc053 1024 }
2f2dc053
SW		 1025}
1026
1c841a96
YZ		 1027static void cleanup_session_requests(struct ceph_mds_client *mdsc,
1028 struct ceph_mds_session *session)
1029{
1030 struct ceph_mds_request *req;
1031 struct rb_node *p;
1032
1033 dout("cleanup_session_requests mds%d\n", session->s_mds);
1034 mutex_lock(&mdsc->mutex);
1035 while (!list_empty(&session->s_unsafe)) {
1036 req = list_first_entry(&session->s_unsafe,
1037 struct ceph_mds_request, r_unsafe_item);
1038 list_del_init(&req->r_unsafe_item);
3e0708b9
YZ		 1039 pr_warn_ratelimited(" dropping unsafe request %llu\n",
1040 req->r_tid);
1c841a96
YZ		 1041 __unregister_request(mdsc, req);
1042 }
1043 /* zero r_attempts, so kick_requests() will re-send requests */
1044 p = rb_first(&mdsc->request_tree);
1045 while (p) {
1046 req = rb_entry(p, struct ceph_mds_request, r_node);
1047 p = rb_next(p);
1048 if (req->r_session &&
1049 req->r_session->s_mds == session->s_mds)
1050 req->r_attempts = 0;
1051 }
1052 mutex_unlock(&mdsc->mutex);
1053}
1054
2f2dc053 1055/*
f818a736
SW		 1056 * Helper to safely iterate over all caps associated with a session, with
1057 * special care taken to handle a racing __ceph_remove_cap().
2f2dc053 1058 *
f818a736 1059 * Caller must hold session s_mutex.
2f2dc053
SW		 1060 */
1061static int iterate_session_caps(struct ceph_mds_session *session,
1062 int (*cb)(struct inode *, struct ceph_cap *,
1063 void *), void *arg)
1064{
7c1332b8
SW		 1065 struct list_head *p;
1066 struct ceph_cap *cap;
1067 struct inode *inode, *last_inode = NULL;
1068 struct ceph_cap *old_cap = NULL;
2f2dc053
SW		 1069 int ret;
1070
1071 dout("iterate_session_caps %p mds%d\n", session, session->s_mds);
1072 spin_lock(&session->s_cap_lock);
7c1332b8
SW		 1073 p = session->s_caps.next;
1074 while (p != &session->s_caps) {
1075 cap = list_entry(p, struct ceph_cap, session_caps);
2f2dc053 1076 inode = igrab(&cap->ci->vfs_inode);
7c1332b8
SW		 1077 if (!inode) {
1078 p = p->next;
2f2dc053 1079 continue;
7c1332b8
SW		 1080 }
1081 session->s_cap_iterator = cap;
2f2dc053 1082 spin_unlock(&session->s_cap_lock);
7c1332b8
SW		 1083
1084 if (last_inode) {
1085 iput(last_inode);
1086 last_inode = NULL;
1087 }
1088 if (old_cap) {
37151668 1089 ceph_put_cap(session->s_mdsc, old_cap);
7c1332b8
SW		 1090 old_cap = NULL;
1091 }
1092
2f2dc053 1093 ret = cb(inode, cap, arg);
7c1332b8
SW		 1094 last_inode = inode;
1095
2f2dc053 1096 spin_lock(&session->s_cap_lock);
7c1332b8
SW		 1097 p = p->next;
1098 if (cap->ci == NULL) {
1099 dout("iterate_session_caps finishing cap %p removal\n",
1100 cap);
1101 BUG_ON(cap->session != session);
745a8e3b 1102 cap->session = NULL;
7c1332b8
SW		 1103 list_del_init(&cap->session_caps);
1104 session->s_nr_caps--;
745a8e3b
YZ		 1105 if (cap->queue_release) {
1106 list_add_tail(&cap->session_caps,
1107 &session->s_cap_releases);
1108 session->s_num_cap_releases++;
1109 } else {
1110 old_cap = cap; /* put_cap it w/o locks held */
1111 }
7c1332b8 1112 }
5dacf091
SW		 1113 if (ret < 0)
1114 goto out;
2f2dc053 1115 }
5dacf091
SW		 1116 ret = 0;
1117out:
7c1332b8 1118 session->s_cap_iterator = NULL;
2f2dc053 1119 spin_unlock(&session->s_cap_lock);
7c1332b8 1120
e96a650a 1121 iput(last_inode);
7c1332b8 1122 if (old_cap)
37151668 1123 ceph_put_cap(session->s_mdsc, old_cap);
7c1332b8 1124
5dacf091 1125 return ret;
2f2dc053
SW		 1126}
1127
1128static int remove_session_caps_cb(struct inode *inode, struct ceph_cap *cap,
6c99f254 1129 void *arg)
2f2dc053 1130{
6c93df5d 1131 struct ceph_fs_client *fsc = (struct ceph_fs_client *)arg;
2f2dc053 1132 struct ceph_inode_info *ci = ceph_inode(inode);
553adfd9 1133 LIST_HEAD(to_remove);
6c93df5d
YZ		 1134 bool drop = false;
1135 bool invalidate = false;
6c99f254 1136
2f2dc053
SW		 1137 dout("removing cap %p, ci is %p, inode is %p\n",
1138 cap, ci, &ci->vfs_inode);
be655596 1139 spin_lock(&ci->i_ceph_lock);
a096b09a 1140 __ceph_remove_cap(cap, false);
571ade33 1141 if (!ci->i_auth_cap) {
553adfd9 1142 struct ceph_cap_flush *cf;
6c93df5d 1143 struct ceph_mds_client *mdsc = fsc->mdsc;
6c99f254 1144
77310320
YZ		 1145 ci->i_ceph_flags |= CEPH_I_CAP_DROPPED;
1146
6c93df5d
YZ		 1147 if (ci->i_wrbuffer_ref > 0 &&
1148 ACCESS_ONCE(fsc->mount_state) == CEPH_MOUNT_SHUTDOWN)
1149 invalidate = true;
1150
553adfd9
YZ		 1151 while (true) {
1152 struct rb_node *n = rb_first(&ci->i_cap_flush_tree);
1153 if (!n)
1154 break;
1155 cf = rb_entry(n, struct ceph_cap_flush, i_node);
1156 rb_erase(&cf->i_node, &ci->i_cap_flush_tree);
1157 list_add(&cf->list, &to_remove);
1158 }
1159
6c99f254 1160 spin_lock(&mdsc->cap_dirty_lock);
8310b089
YZ		 1161
1162 list_for_each_entry(cf, &to_remove, list)
1163 rb_erase(&cf->g_node, &mdsc->cap_flush_tree);
1164
6c99f254 1165 if (!list_empty(&ci->i_dirty_item)) {
3e0708b9
YZ		 1166 pr_warn_ratelimited(
1167 " dropping dirty %s state for %p %lld\n",
6c99f254
SW		 1168 ceph_cap_string(ci->i_dirty_caps),
1169 inode, ceph_ino(inode));
1170 ci->i_dirty_caps = 0;
1171 list_del_init(&ci->i_dirty_item);
6c93df5d 1172 drop = true;
6c99f254
SW		 1173 }
1174 if (!list_empty(&ci->i_flushing_item)) {
3e0708b9
YZ		 1175 pr_warn_ratelimited(
1176 " dropping dirty+flushing %s state for %p %lld\n",
6c99f254
SW		 1177 ceph_cap_string(ci->i_flushing_caps),
1178 inode, ceph_ino(inode));
1179 ci->i_flushing_caps = 0;
1180 list_del_init(&ci->i_flushing_item);
1181 mdsc->num_cap_flushing--;
6c93df5d 1182 drop = true;
6c99f254 1183 }
6c99f254 1184 spin_unlock(&mdsc->cap_dirty_lock);
553adfd9 1185
f66fd9f0
YZ		 1186 if (!ci->i_dirty_caps && ci->i_prealloc_cap_flush) {
1187 list_add(&ci->i_prealloc_cap_flush->list, &to_remove);
1188 ci->i_prealloc_cap_flush = NULL;
1189 }
6c99f254 1190 }
be655596 1191 spin_unlock(&ci->i_ceph_lock);
553adfd9
YZ		 1192 while (!list_empty(&to_remove)) {
1193 struct ceph_cap_flush *cf;
1194 cf = list_first_entry(&to_remove,
1195 struct ceph_cap_flush, list);
1196 list_del(&cf->list);
f66fd9f0 1197 ceph_free_cap_flush(cf);
553adfd9 1198 }
77310320
YZ		 1199
1200 wake_up_all(&ci->i_cap_wq);
6c93df5d
YZ		 1201 if (invalidate)
1202 ceph_queue_invalidate(inode);
77310320 1203 if (drop)
6c99f254 1204 iput(inode);
2f2dc053
SW		 1205 return 0;
1206}
1207
1208/*
1209 * caller must hold session s_mutex
1210 */
1211static void remove_session_caps(struct ceph_mds_session *session)
1212{
6c93df5d
YZ		 1213 struct ceph_fs_client *fsc = session->s_mdsc->fsc;
1214 struct super_block *sb = fsc->sb;
2f2dc053 1215 dout("remove_session_caps on %p\n", session);
6c93df5d 1216 iterate_session_caps(session, remove_session_caps_cb, fsc);
6f60f889
YZ		 1217
1218 spin_lock(&session->s_cap_lock);
1219 if (session->s_nr_caps > 0) {
6f60f889
YZ		 1220 struct inode *inode;
1221 struct ceph_cap *cap, *prev = NULL;
1222 struct ceph_vino vino;
1223 /*
1224 * iterate_session_caps() skips inodes that are being
1225 * deleted, we need to wait until deletions are complete.
1226 * __wait_on_freeing_inode() is designed for the job,
1227 * but it is not exported, so use lookup inode function
1228 * to access it.
1229 */
1230 while (!list_empty(&session->s_caps)) {
1231 cap = list_entry(session->s_caps.next,
1232 struct ceph_cap, session_caps);
1233 if (cap == prev)
1234 break;
1235 prev = cap;
1236 vino = cap->ci->i_vino;
1237 spin_unlock(&session->s_cap_lock);
1238
ed284c49 1239 inode = ceph_find_inode(sb, vino);
6f60f889
YZ		 1240 iput(inode);
1241
1242 spin_lock(&session->s_cap_lock);
1243 }
1244 }
745a8e3b
YZ		 1245
1246 // drop cap expires and unlock s_cap_lock
1247 cleanup_cap_releases(session->s_mdsc, session);
6f60f889 1248
2f2dc053 1249 BUG_ON(session->s_nr_caps > 0);
6c99f254 1250 BUG_ON(!list_empty(&session->s_cap_flushing));
2f2dc053
SW		 1251}
1252
1253/*
1254 * wake up any threads waiting on this session's caps. if the cap is
1255 * old (didn't get renewed on the client reconnect), remove it now.
1256 *
1257 * caller must hold s_mutex.
1258 */
1259static int wake_up_session_cb(struct inode *inode, struct ceph_cap *cap,
1260 void *arg)
1261{
0dc2570f
SW		 1262 struct ceph_inode_info *ci = ceph_inode(inode);
1263
0dc2570f 1264 if (arg) {
be655596 1265 spin_lock(&ci->i_ceph_lock);
0dc2570f
SW		 1266 ci->i_wanted_max_size = 0;
1267 ci->i_requested_max_size = 0;
be655596 1268 spin_unlock(&ci->i_ceph_lock);
0dc2570f 1269 }
e5360309 1270 wake_up_all(&ci->i_cap_wq);
2f2dc053
SW		 1271 return 0;
1272}
1273
0dc2570f
SW		 1274static void wake_up_session_caps(struct ceph_mds_session *session,
1275 int reconnect)
2f2dc053
SW		 1276{
1277 dout("wake_up_session_caps %p mds%d\n", session, session->s_mds);
0dc2570f
SW		 1278 iterate_session_caps(session, wake_up_session_cb,
1279 (void *)(unsigned long)reconnect);
2f2dc053
SW		 1280}
1281
1282/*
1283 * Send periodic message to MDS renewing all currently held caps. The
1284 * ack will reset the expiration for all caps from this session.
1285 *
1286 * caller holds s_mutex
1287 */
1288static int send_renew_caps(struct ceph_mds_client *mdsc,
1289 struct ceph_mds_session *session)
1290{
1291 struct ceph_msg *msg;
1292 int state;
1293
1294 if (time_after_eq(jiffies, session->s_cap_ttl) &&
1295 time_after_eq(session->s_cap_ttl, session->s_renew_requested))
1296 pr_info("mds%d caps stale\n", session->s_mds);
e4cb4cb8 1297 session->s_renew_requested = jiffies;
2f2dc053
SW		 1298
1299 /* do not try to renew caps until a recovering mds has reconnected
1300 * with its clients. */
1301 state = ceph_mdsmap_get_state(mdsc->mdsmap, session->s_mds);
1302 if (state < CEPH_MDS_STATE_RECONNECT) {
1303 dout("send_renew_caps ignoring mds%d (%s)\n",
1304 session->s_mds, ceph_mds_state_name(state));
1305 return 0;
1306 }
1307
1308 dout("send_renew_caps to mds%d (%s)\n", session->s_mds,
1309 ceph_mds_state_name(state));
2f2dc053
SW		 1310 msg = create_session_msg(CEPH_SESSION_REQUEST_RENEWCAPS,
1311 ++session->s_renew_seq);
a79832f2
SW		 1312 if (!msg)
1313 return -ENOMEM;
2f2dc053
SW		 1314 ceph_con_send(&session->s_con, msg);
1315 return 0;
1316}
1317
186e4f7a
YZ		 1318static int send_flushmsg_ack(struct ceph_mds_client *mdsc,
1319 struct ceph_mds_session *session, u64 seq)
1320{
1321 struct ceph_msg *msg;
1322
1323 dout("send_flushmsg_ack to mds%d (%s)s seq %lld\n",
a687ecaf 1324 session->s_mds, ceph_session_state_name(session->s_state), seq);
186e4f7a
YZ		 1325 msg = create_session_msg(CEPH_SESSION_FLUSHMSG_ACK, seq);
1326 if (!msg)
1327 return -ENOMEM;
1328 ceph_con_send(&session->s_con, msg);
1329 return 0;
1330}
1331
1332
2f2dc053
SW		 1333/*
1334 * Note new cap ttl, and any transition from stale -> not stale (fresh?).
0dc2570f
SW		 1335 *
1336 * Called under session->s_mutex
2f2dc053
SW		 1337 */
1338static void renewed_caps(struct ceph_mds_client *mdsc,
1339 struct ceph_mds_session *session, int is_renew)
1340{
1341 int was_stale;
1342 int wake = 0;
1343
1344 spin_lock(&session->s_cap_lock);
1ce208a6 1345 was_stale = is_renew && time_after_eq(jiffies, session->s_cap_ttl);
2f2dc053
SW		 1346
1347 session->s_cap_ttl = session->s_renew_requested +
1348 mdsc->mdsmap->m_session_timeout*HZ;
1349
1350 if (was_stale) {
1351 if (time_before(jiffies, session->s_cap_ttl)) {
1352 pr_info("mds%d caps renewed\n", session->s_mds);
1353 wake = 1;
1354 } else {
1355 pr_info("mds%d caps still stale\n", session->s_mds);
1356 }
1357 }
1358 dout("renewed_caps mds%d ttl now %lu, was %s, now %s\n",
1359 session->s_mds, session->s_cap_ttl, was_stale ? "stale" : "fresh",
1360 time_before(jiffies, session->s_cap_ttl) ? "stale" : "fresh");
1361 spin_unlock(&session->s_cap_lock);
1362
1363 if (wake)
0dc2570f 1364 wake_up_session_caps(session, 0);
2f2dc053
SW		 1365}
1366
1367/*
1368 * send a session close request
1369 */
1370static int request_close_session(struct ceph_mds_client *mdsc,
1371 struct ceph_mds_session *session)
1372{
1373 struct ceph_msg *msg;
2f2dc053
SW		 1374
1375 dout("request_close_session mds%d state %s seq %lld\n",
a687ecaf 1376 session->s_mds, ceph_session_state_name(session->s_state),
2f2dc053
SW		 1377 session->s_seq);
1378 msg = create_session_msg(CEPH_SESSION_REQUEST_CLOSE, session->s_seq);
a79832f2
SW		 1379 if (!msg)
1380 return -ENOMEM;
1381 ceph_con_send(&session->s_con, msg);
1382 return 0;
2f2dc053
SW		 1383}
1384
1385/*
1386 * Called with s_mutex held.
1387 */
1388static int __close_session(struct ceph_mds_client *mdsc,
1389 struct ceph_mds_session *session)
1390{
1391 if (session->s_state >= CEPH_MDS_SESSION_CLOSING)
1392 return 0;
1393 session->s_state = CEPH_MDS_SESSION_CLOSING;
1394 return request_close_session(mdsc, session);
1395}
1396
1397/*
1398 * Trim old(er) caps.
1399 *
1400 * Because we can't cache an inode without one or more caps, we do
1401 * this indirectly: if a cap is unused, we prune its aliases, at which
1402 * point the inode will hopefully get dropped to.
1403 *
1404 * Yes, this is a bit sloppy. Our only real goal here is to respond to
1405 * memory pressure from the MDS, though, so it needn't be perfect.
1406 */
1407static int trim_caps_cb(struct inode *inode, struct ceph_cap *cap, void *arg)
1408{
1409 struct ceph_mds_session *session = arg;
1410 struct ceph_inode_info *ci = ceph_inode(inode);
979abfdd 1411 int used, wanted, oissued, mine;
2f2dc053
SW		 1412
1413 if (session->s_trim_caps <= 0)
1414 return -1;
1415
be655596 1416 spin_lock(&ci->i_ceph_lock);
2f2dc053
SW		 1417 mine = cap->issued | cap->implemented;
1418 used = __ceph_caps_used(ci);
979abfdd 1419 wanted = __ceph_caps_file_wanted(ci);
2f2dc053
SW		 1420 oissued = __ceph_caps_issued_other(ci, cap);
1421
979abfdd 1422 dout("trim_caps_cb %p cap %p mine %s oissued %s used %s wanted %s\n",
2f2dc053 1423 inode, cap, ceph_cap_string(mine), ceph_cap_string(oissued),
979abfdd
YZ		 1424 ceph_cap_string(used), ceph_cap_string(wanted));
1425 if (cap == ci->i_auth_cap) {
622f3e25
YZ		 1426 if (ci->i_dirty_caps || ci->i_flushing_caps ||
1427 !list_empty(&ci->i_cap_snaps))
979abfdd
YZ		 1428 goto out;
1429 if ((used | wanted) & CEPH_CAP_ANY_WR)
1430 goto out;
1431 }
5e804ac4
YZ		 1432 /* The inode has cached pages, but it's no longer used.
1433 * we can safely drop it */
1434 if (wanted == 0 && used == CEPH_CAP_FILE_CACHE &&
1435 !(oissued & CEPH_CAP_FILE_CACHE)) {
1436 used = 0;
1437 oissued = 0;
1438 }
979abfdd 1439 if ((used | wanted) & ~oissued & mine)
2f2dc053
SW		 1440 goto out; /* we need these caps */
1441
1442 session->s_trim_caps--;
1443 if (oissued) {
1444 /* we aren't the only cap.. just remove us */
a096b09a 1445 __ceph_remove_cap(cap, true);
2f2dc053 1446 } else {
5e804ac4 1447 /* try dropping referring dentries */
be655596 1448 spin_unlock(&ci->i_ceph_lock);
2f2dc053
SW		 1449 d_prune_aliases(inode);
1450 dout("trim_caps_cb %p cap %p pruned, count now %d\n",
1451 inode, cap, atomic_read(&inode->i_count));
1452 return 0;
1453 }
1454
1455out:
be655596 1456 spin_unlock(&ci->i_ceph_lock);
2f2dc053
SW		 1457 return 0;
1458}
1459
1460/*
1461 * Trim session cap count down to some max number.
1462 */
1463static int trim_caps(struct ceph_mds_client *mdsc,
1464 struct ceph_mds_session *session,
1465 int max_caps)
1466{
1467 int trim_caps = session->s_nr_caps - max_caps;
1468
1469 dout("trim_caps mds%d start: %d / %d, trim %d\n",
1470 session->s_mds, session->s_nr_caps, max_caps, trim_caps);
1471 if (trim_caps > 0) {
1472 session->s_trim_caps = trim_caps;
1473 iterate_session_caps(session, trim_caps_cb, session);
1474 dout("trim_caps mds%d done: %d / %d, trimmed %d\n",
1475 session->s_mds, session->s_nr_caps, max_caps,
1476 trim_caps - session->s_trim_caps);
5dacf091 1477 session->s_trim_caps = 0;
2f2dc053 1478 }
a56371d9 1479
a56371d9 1480 ceph_send_cap_releases(mdsc, session);
2f2dc053
SW		 1481 return 0;
1482}
1483
8310b089
YZ		 1484static int check_capsnap_flush(struct ceph_inode_info *ci,
1485 u64 want_snap_seq)
d3383a8e 1486{
8310b089 1487 int ret = 1;
d3383a8e 1488 spin_lock(&ci->i_ceph_lock);
affbc19a
YZ		 1489 if (want_snap_seq > 0 && !list_empty(&ci->i_cap_snaps)) {
1490 struct ceph_cap_snap *capsnap =
1491 list_first_entry(&ci->i_cap_snaps,
1492 struct ceph_cap_snap, ci_item);
8310b089 1493 ret = capsnap->follows >= want_snap_seq;
affbc19a 1494 }
d3383a8e 1495 spin_unlock(&ci->i_ceph_lock);
8310b089
YZ		 1496 return ret;
1497}
1498
1499static int check_caps_flush(struct ceph_mds_client *mdsc,
1500 u64 want_flush_tid)
1501{
1502 struct rb_node *n;
1503 struct ceph_cap_flush *cf;
1504 int ret = 1;
1505
1506 spin_lock(&mdsc->cap_dirty_lock);
1507 n = rb_first(&mdsc->cap_flush_tree);
1508 cf = n ? rb_entry(n, struct ceph_cap_flush, g_node) : NULL;
1509 if (cf && cf->tid <= want_flush_tid) {
1510 dout("check_caps_flush still flushing tid %llu <= %llu\n",
1511 cf->tid, want_flush_tid);
1512 ret = 0;
1513 }
1514 spin_unlock(&mdsc->cap_dirty_lock);
1515 return ret;
d3383a8e
YZ		 1516}
1517
2f2dc053
SW		 1518/*
1519 * flush all dirty inode data to disk.
1520 *
8310b089 1521 * returns true if we've flushed through want_flush_tid
2f2dc053 1522 */
affbc19a 1523static void wait_caps_flush(struct ceph_mds_client *mdsc,
8310b089 1524 u64 want_flush_tid, u64 want_snap_seq)
2f2dc053 1525{
d3383a8e 1526 int mds;
2f2dc053 1527
8310b089
YZ		 1528 dout("check_caps_flush want %llu snap want %llu\n",
1529 want_flush_tid, want_snap_seq);
2f2dc053 1530 mutex_lock(&mdsc->mutex);
affbc19a 1531 for (mds = 0; mds < mdsc->max_sessions; ) {
2f2dc053 1532 struct ceph_mds_session *session = mdsc->sessions[mds];
8310b089 1533 struct inode *inode = NULL;
2f2dc053 1534
affbc19a
YZ		 1535 if (!session) {
1536 mds++;
2f2dc053 1537 continue;
affbc19a 1538 }
2f2dc053
SW		 1539 get_session(session);
1540 mutex_unlock(&mdsc->mutex);
1541
1542 mutex_lock(&session->s_mutex);
affbc19a
YZ		 1543 if (!list_empty(&session->s_cap_snaps_flushing)) {
1544 struct ceph_cap_snap *capsnap =
1545 list_first_entry(&session->s_cap_snaps_flushing,
1546 struct ceph_cap_snap,
1547 flushing_item);
1548 struct ceph_inode_info *ci = capsnap->ci;
8310b089 1549 if (!check_capsnap_flush(ci, want_snap_seq)) {
affbc19a
YZ		 1550 dout("check_cap_flush still flushing snap %p "
1551 "follows %lld <= %lld to mds%d\n",
1552 &ci->vfs_inode, capsnap->follows,
1553 want_snap_seq, mds);
8310b089 1554 inode = igrab(&ci->vfs_inode);
2f2dc053 1555 }
2f2dc053
SW		 1556 }
1557 mutex_unlock(&session->s_mutex);
1558 ceph_put_mds_session(session);
1559
8310b089 1560 if (inode) {
affbc19a 1561 wait_event(mdsc->cap_flushing_wq,
8310b089
YZ		 1562 check_capsnap_flush(ceph_inode(inode),
1563 want_snap_seq));
1564 iput(inode);
1565 } else {
affbc19a 1566 mds++;
8310b089 1567 }
affbc19a 1568
2f2dc053
SW		 1569 mutex_lock(&mdsc->mutex);
1570 }
2f2dc053 1571 mutex_unlock(&mdsc->mutex);
8310b089
YZ		 1572
1573 wait_event(mdsc->cap_flushing_wq,
1574 check_caps_flush(mdsc, want_flush_tid));
1575
1576 dout("check_caps_flush ok, flushed thru %llu\n", want_flush_tid);
2f2dc053
SW		 1577}
1578
1579/*
1580 * called under s_mutex
1581 */
3d7ded4d
SW		 1582void ceph_send_cap_releases(struct ceph_mds_client *mdsc,
1583 struct ceph_mds_session *session)
2f2dc053 1584{
745a8e3b
YZ		 1585 struct ceph_msg *msg = NULL;
1586 struct ceph_mds_cap_release *head;
1587 struct ceph_mds_cap_item *item;
1588 struct ceph_cap *cap;
1589 LIST_HEAD(tmp_list);
1590 int num_cap_releases;
2f2dc053 1591
0f8605f2 1592 spin_lock(&session->s_cap_lock);
745a8e3b
YZ		 1593again:
1594 list_splice_init(&session->s_cap_releases, &tmp_list);
1595 num_cap_releases = session->s_num_cap_releases;
1596 session->s_num_cap_releases = 0;
2f2dc053 1597 spin_unlock(&session->s_cap_lock);
e01a5946 1598
745a8e3b
YZ		 1599 while (!list_empty(&tmp_list)) {
1600 if (!msg) {
1601 msg = ceph_msg_new(CEPH_MSG_CLIENT_CAPRELEASE,
09cbfeaf 1602 PAGE_SIZE, GFP_NOFS, false);
745a8e3b
YZ		 1603 if (!msg)
1604 goto out_err;
1605 head = msg->front.iov_base;
1606 head->num = cpu_to_le32(0);
1607 msg->front.iov_len = sizeof(*head);
1608 }
1609 cap = list_first_entry(&tmp_list, struct ceph_cap,
1610 session_caps);
1611 list_del(&cap->session_caps);
1612 num_cap_releases--;
e01a5946 1613
00bd8edb 1614 head = msg->front.iov_base;
745a8e3b
YZ		 1615 le32_add_cpu(&head->num, 1);
1616 item = msg->front.iov_base + msg->front.iov_len;
1617 item->ino = cpu_to_le64(cap->cap_ino);
1618 item->cap_id = cpu_to_le64(cap->cap_id);
1619 item->migrate_seq = cpu_to_le32(cap->mseq);
1620 item->seq = cpu_to_le32(cap->issue_seq);
1621 msg->front.iov_len += sizeof(*item);
1622
1623 ceph_put_cap(mdsc, cap);
1624
1625 if (le32_to_cpu(head->num) == CEPH_CAPS_PER_RELEASE) {
1626 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
1627 dout("send_cap_releases mds%d %p\n", session->s_mds, msg);
1628 ceph_con_send(&session->s_con, msg);
1629 msg = NULL;
1630 }
00bd8edb 1631 }
e01a5946 1632
745a8e3b 1633 BUG_ON(num_cap_releases != 0);
e01a5946 1634
745a8e3b
YZ		 1635 spin_lock(&session->s_cap_lock);
1636 if (!list_empty(&session->s_cap_releases))
1637 goto again;
1638 spin_unlock(&session->s_cap_lock);
1639
1640 if (msg) {
1641 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
1642 dout("send_cap_releases mds%d %p\n", session->s_mds, msg);
1643 ceph_con_send(&session->s_con, msg);
e01a5946 1644 }
745a8e3b
YZ		 1645 return;
1646out_err:
1647 pr_err("send_cap_releases mds%d, failed to allocate message\n",
1648 session->s_mds);
1649 spin_lock(&session->s_cap_lock);
1650 list_splice(&tmp_list, &session->s_cap_releases);
1651 session->s_num_cap_releases += num_cap_releases;
1652 spin_unlock(&session->s_cap_lock);
e01a5946
SW		 1653}
1654
2f2dc053
SW		 1655/*
1656 * requests
1657 */
1658
54008399
YZ		 1659int ceph_alloc_readdir_reply_buffer(struct ceph_mds_request *req,
1660 struct inode *dir)
1661{
1662 struct ceph_inode_info *ci = ceph_inode(dir);
1663 struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1664 struct ceph_mount_options *opt = req->r_mdsc->fsc->mount_options;
2a5beea3 1665 size_t size = sizeof(struct ceph_mds_reply_dir_entry);
54008399
YZ		 1666 int order, num_entries;
1667
1668 spin_lock(&ci->i_ceph_lock);
1669 num_entries = ci->i_files + ci->i_subdirs;
1670 spin_unlock(&ci->i_ceph_lock);
1671 num_entries = max(num_entries, 1);
1672 num_entries = min(num_entries, opt->max_readdir);
1673
1674 order = get_order(size * num_entries);
1675 while (order >= 0) {
2a5beea3
YZ		 1676 rinfo->dir_entries = (void*)__get_free_pages(GFP_KERNEL |
1677 __GFP_NOWARN,
1678 order);
1679 if (rinfo->dir_entries)
54008399
YZ		 1680 break;
1681 order--;
1682 }
2a5beea3 1683 if (!rinfo->dir_entries)
54008399
YZ		 1684 return -ENOMEM;
1685
1686 num_entries = (PAGE_SIZE << order) / size;
1687 num_entries = min(num_entries, opt->max_readdir);
1688
1689 rinfo->dir_buf_size = PAGE_SIZE << order;
1690 req->r_num_caps = num_entries + 1;
1691 req->r_args.readdir.max_entries = cpu_to_le32(num_entries);
1692 req->r_args.readdir.max_bytes = cpu_to_le32(opt->max_readdir_bytes);
1693 return 0;
1694}
1695
2f2dc053
SW		 1696/*
1697 * Create an mds request.
1698 */
1699struct ceph_mds_request *
1700ceph_mdsc_create_request(struct ceph_mds_client *mdsc, int op, int mode)
1701{
1702 struct ceph_mds_request *req = kzalloc(sizeof(*req), GFP_NOFS);
1703
1704 if (!req)
1705 return ERR_PTR(-ENOMEM);
1706
b4556396 1707 mutex_init(&req->r_fill_mutex);
37151668 1708 req->r_mdsc = mdsc;
2f2dc053
SW		 1709 req->r_started = jiffies;
1710 req->r_resend_mds = -1;
1711 INIT_LIST_HEAD(&req->r_unsafe_dir_item);
68cd5b4b 1712 INIT_LIST_HEAD(&req->r_unsafe_target_item);
2f2dc053 1713 req->r_fmode = -1;
153c8e6b 1714 kref_init(&req->r_kref);
fcd00b68 1715 RB_CLEAR_NODE(&req->r_node);
2f2dc053
SW		 1716 INIT_LIST_HEAD(&req->r_wait);
1717 init_completion(&req->r_completion);
1718 init_completion(&req->r_safe_completion);
1719 INIT_LIST_HEAD(&req->r_unsafe_item);
1720
8bbd4714 1721 req->r_stamp = current_fs_time(mdsc->fsc->sb);
b8e69066 1722
2f2dc053
SW		 1723 req->r_op = op;
1724 req->r_direct_mode = mode;
1725 return req;
1726}
1727
1728/*
44ca18f2 1729 * return oldest (lowest) request, tid in request tree, 0 if none.
2f2dc053
SW		 1730 *
1731 * called under mdsc->mutex.
1732 */
44ca18f2
SW		 1733static struct ceph_mds_request *__get_oldest_req(struct ceph_mds_client *mdsc)
1734{
1735 if (RB_EMPTY_ROOT(&mdsc->request_tree))
1736 return NULL;
1737 return rb_entry(rb_first(&mdsc->request_tree),
1738 struct ceph_mds_request, r_node);
1739}
1740
e8a7b8b1 1741static inline u64 __get_oldest_tid(struct ceph_mds_client *mdsc)
2f2dc053 1742{
e8a7b8b1 1743 return mdsc->oldest_tid;
2f2dc053
SW		 1744}
1745
1746/*
1747 * Build a dentry's path. Allocate on heap; caller must kfree. Based
1748 * on build_path_from_dentry in fs/cifs/dir.c.
1749 *
1750 * If @stop_on_nosnap, generate path relative to the first non-snapped
1751 * inode.
1752 *
1753 * Encode hidden .snap dirs as a double /, i.e.
1754 * foo/.snap/bar -> foo//bar
1755 */
1756char *ceph_mdsc_build_path(struct dentry *dentry, int *plen, u64 *base,
1757 int stop_on_nosnap)
1758{
1759 struct dentry *temp;
1760 char *path;
1761 int len, pos;
1b71fe2e 1762 unsigned seq;
2f2dc053
SW		 1763
1764 if (dentry == NULL)
1765 return ERR_PTR(-EINVAL);
1766
1767retry:
1768 len = 0;
1b71fe2e
AV		 1769 seq = read_seqbegin(&rename_lock);
1770 rcu_read_lock();
2f2dc053 1771 for (temp = dentry; !IS_ROOT(temp);) {
2b0143b5 1772 struct inode *inode = d_inode(temp);
2f2dc053
SW		 1773 if (inode && ceph_snap(inode) == CEPH_SNAPDIR)
1774 len++; /* slash only */
1775 else if (stop_on_nosnap && inode &&
1776 ceph_snap(inode) == CEPH_NOSNAP)
1777 break;
1778 else
1779 len += 1 + temp->d_name.len;
1780 temp = temp->d_parent;
2f2dc053 1781 }
1b71fe2e 1782 rcu_read_unlock();
2f2dc053
SW		 1783 if (len)
1784 len--; /* no leading '/' */
1785
1786 path = kmalloc(len+1, GFP_NOFS);
1787 if (path == NULL)
1788 return ERR_PTR(-ENOMEM);
1789 pos = len;
1790 path[pos] = 0; /* trailing null */
1b71fe2e 1791 rcu_read_lock();
2f2dc053 1792 for (temp = dentry; !IS_ROOT(temp) && pos != 0; ) {
1b71fe2e 1793 struct inode *inode;
2f2dc053 1794
1b71fe2e 1795 spin_lock(&temp->d_lock);
2b0143b5 1796 inode = d_inode(temp);
2f2dc053 1797 if (inode && ceph_snap(inode) == CEPH_SNAPDIR) {
104648ad 1798 dout("build_path path+%d: %p SNAPDIR\n",
2f2dc053
SW		 1799 pos, temp);
1800 } else if (stop_on_nosnap && inode &&
1801 ceph_snap(inode) == CEPH_NOSNAP) {
9d5a09e6 1802 spin_unlock(&temp->d_lock);
2f2dc053
SW		 1803 break;
1804 } else {
1805 pos -= temp->d_name.len;
1b71fe2e
AV		 1806 if (pos < 0) {
1807 spin_unlock(&temp->d_lock);
2f2dc053 1808 break;
1b71fe2e 1809 }
2f2dc053
SW		 1810 strncpy(path + pos, temp->d_name.name,
1811 temp->d_name.len);
2f2dc053 1812 }
1b71fe2e 1813 spin_unlock(&temp->d_lock);
2f2dc053
SW		 1814 if (pos)
1815 path[--pos] = '/';
1816 temp = temp->d_parent;
2f2dc053 1817 }
1b71fe2e
AV		 1818 rcu_read_unlock();
1819 if (pos != 0 || read_seqretry(&rename_lock, seq)) {
104648ad 1820 pr_err("build_path did not end path lookup where "
2f2dc053
SW		 1821 "expected, namelen is %d, pos is %d\n", len, pos);
1822 /* presumably this is only possible if racing with a
1823 rename of one of the parent directories (we can not
1824 lock the dentries above us to prevent this, but
1825 retrying should be harmless) */
1826 kfree(path);
1827 goto retry;
1828 }
1829
2b0143b5 1830 *base = ceph_ino(d_inode(temp));
2f2dc053 1831 *plen = len;
104648ad 1832 dout("build_path on %p %d built %llx '%.*s'\n",
84d08fa8 1833 dentry, d_count(dentry), *base, len, path);
2f2dc053
SW		 1834 return path;
1835}
1836
1837static int build_dentry_path(struct dentry *dentry,
1838 const char **ppath, int *ppathlen, u64 *pino,
1839 int *pfreepath)
1840{
1841 char *path;
1842
2b0143b5
DH		 1843 if (ceph_snap(d_inode(dentry->d_parent)) == CEPH_NOSNAP) {
1844 *pino = ceph_ino(d_inode(dentry->d_parent));
2f2dc053
SW		 1845 *ppath = dentry->d_name.name;
1846 *ppathlen = dentry->d_name.len;
1847 return 0;
1848 }
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,
1884 const char *rpath, u64 rino,
1885 const char **ppath, int *pathlen,
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) {
1895 r = build_dentry_path(rdentry, ppath, pathlen, ino, freepath);
1896 dout(" dentry %p %llx/%.*s\n", rdentry, *ino, *pathlen,
1897 *ppath);
795858db 1898 } else if (rpath || rino) {
2f2dc053
SW		 1899 *ino = rino;
1900 *ppath = rpath;
b000056a 1901 *pathlen = rpath ? strlen(rpath) : 0;
2f2dc053
SW		 1902 dout(" path %.*s\n", *pathlen, rpath);
1903 }
1904
1905 return r;
1906}
1907
1908/*
1909 * called under mdsc->mutex
1910 */
1911static struct ceph_msg *create_request_message(struct ceph_mds_client *mdsc,
1912 struct ceph_mds_request *req,
6e6f0923 1913 int mds, bool drop_cap_releases)
2f2dc053
SW		 1914{
1915 struct ceph_msg *msg;
1916 struct ceph_mds_request_head *head;
1917 const char *path1 = NULL;
1918 const char *path2 = NULL;
1919 u64 ino1 = 0, ino2 = 0;
1920 int pathlen1 = 0, pathlen2 = 0;
1921 int freepath1 = 0, freepath2 = 0;
1922 int len;
1923 u16 releases;
1924 void *p, *end;
1925 int ret;
1926
1927 ret = set_request_path_attr(req->r_inode, req->r_dentry,
1928 req->r_path1, req->r_ino1.ino,
1929 &path1, &pathlen1, &ino1, &freepath1);
1930 if (ret < 0) {
1931 msg = ERR_PTR(ret);
1932 goto out;
1933 }
1934
1935 ret = set_request_path_attr(NULL, req->r_old_dentry,
1936 req->r_path2, req->r_ino2.ino,
1937 &path2, &pathlen2, &ino2, &freepath2);
1938 if (ret < 0) {
1939 msg = ERR_PTR(ret);
1940 goto out_free1;
1941 }
1942
1943 len = sizeof(*head) +
b8e69066 1944 pathlen1 + pathlen2 + 2*(1 + sizeof(u32) + sizeof(u64)) +
777d738a 1945 sizeof(struct ceph_timespec);
2f2dc053
SW		 1946
1947 /* calculate (max) length for cap releases */
1948 len += sizeof(struct ceph_mds_request_release) *
1949 (!!req->r_inode_drop + !!req->r_dentry_drop +
1950 !!req->r_old_inode_drop + !!req->r_old_dentry_drop);
1951 if (req->r_dentry_drop)
1952 len += req->r_dentry->d_name.len;
1953 if (req->r_old_dentry_drop)
1954 len += req->r_old_dentry->d_name.len;
1955
b61c2763 1956 msg = ceph_msg_new(CEPH_MSG_CLIENT_REQUEST, len, GFP_NOFS, false);
a79832f2
SW		 1957 if (!msg) {
1958 msg = ERR_PTR(-ENOMEM);
2f2dc053 1959 goto out_free2;
a79832f2 1960 }
2f2dc053 1961
7cfa0313 1962 msg->hdr.version = cpu_to_le16(2);
6df058c0
SW		 1963 msg->hdr.tid = cpu_to_le64(req->r_tid);
1964
2f2dc053
SW		 1965 head = msg->front.iov_base;
1966 p = msg->front.iov_base + sizeof(*head);
1967 end = msg->front.iov_base + msg->front.iov_len;
1968
1969 head->mdsmap_epoch = cpu_to_le32(mdsc->mdsmap->m_epoch);
1970 head->op = cpu_to_le32(req->r_op);
ff3d0046
EB		 1971 head->caller_uid = cpu_to_le32(from_kuid(&init_user_ns, req->r_uid));
1972 head->caller_gid = cpu_to_le32(from_kgid(&init_user_ns, req->r_gid));
2f2dc053
SW		 1973 head->args = req->r_args;
1974
1975 ceph_encode_filepath(&p, end, ino1, path1);
1976 ceph_encode_filepath(&p, end, ino2, path2);
1977
e979cf50
SW		 1978 /* make note of release offset, in case we need to replay */
1979 req->r_request_release_offset = p - msg->front.iov_base;
1980
2f2dc053
SW		 1981 /* cap releases */
1982 releases = 0;
1983 if (req->r_inode_drop)
1984 releases += ceph_encode_inode_release(&p,
2b0143b5 1985 req->r_inode ? req->r_inode : d_inode(req->r_dentry),
2f2dc053
SW		 1986 mds, req->r_inode_drop, req->r_inode_unless, 0);
1987 if (req->r_dentry_drop)
1988 releases += ceph_encode_dentry_release(&p, req->r_dentry,
1989 mds, req->r_dentry_drop, req->r_dentry_unless);
1990 if (req->r_old_dentry_drop)
1991 releases += ceph_encode_dentry_release(&p, req->r_old_dentry,
1992 mds, req->r_old_dentry_drop, req->r_old_dentry_unless);
1993 if (req->r_old_inode_drop)
1994 releases += ceph_encode_inode_release(&p,
2b0143b5 1995 d_inode(req->r_old_dentry),
2f2dc053 1996 mds, req->r_old_inode_drop, req->r_old_inode_unless, 0);
6e6f0923
YZ		 1997
1998 if (drop_cap_releases) {
1999 releases = 0;
2000 p = msg->front.iov_base + req->r_request_release_offset;
2001 }
2002
2f2dc053
SW		 2003 head->num_releases = cpu_to_le16(releases);
2004
b8e69066 2005 /* time stamp */
1f041a89
YZ		 2006 {
2007 struct ceph_timespec ts;
2008 ceph_encode_timespec(&ts, &req->r_stamp);
2009 ceph_encode_copy(&p, &ts, sizeof(ts));
2010 }
b8e69066 2011
2f2dc053
SW		 2012 BUG_ON(p > end);
2013 msg->front.iov_len = p - msg->front.iov_base;
2014 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
2015
25e6bae3
YZ		 2016 if (req->r_pagelist) {
2017 struct ceph_pagelist *pagelist = req->r_pagelist;
2018 atomic_inc(&pagelist->refcnt);
2019 ceph_msg_data_add_pagelist(msg, pagelist);
2020 msg->hdr.data_len = cpu_to_le32(pagelist->length);
2021 } else {
2022 msg->hdr.data_len = 0;
ebf18f47 2023 }
02afca6c 2024
2f2dc053
SW		 2025 msg->hdr.data_off = cpu_to_le16(0);
2026
2027out_free2:
2028 if (freepath2)
2029 kfree((char *)path2);
2030out_free1:
2031 if (freepath1)
2032 kfree((char *)path1);
2033out:
2034 return msg;
2035}
2036
2037/*
2038 * called under mdsc->mutex if error, under no mutex if
2039 * success.
2040 */
2041static void complete_request(struct ceph_mds_client *mdsc,
2042 struct ceph_mds_request *req)
2043{
2044 if (req->r_callback)
2045 req->r_callback(mdsc, req);
2046 else
03066f23 2047 complete_all(&req->r_completion);
2f2dc053
SW		 2048}
2049
2050/*
2051 * called under mdsc->mutex
2052 */
2053static int __prepare_send_request(struct ceph_mds_client *mdsc,
2054 struct ceph_mds_request *req,
6e6f0923 2055 int mds, bool drop_cap_releases)
2f2dc053
SW		 2056{
2057 struct ceph_mds_request_head *rhead;
2058 struct ceph_msg *msg;
2059 int flags = 0;
2060
2f2dc053 2061 req->r_attempts++;
e55b71f8
GF		 2062 if (req->r_inode) {
2063 struct ceph_cap *cap =
2064 ceph_get_cap_for_mds(ceph_inode(req->r_inode), mds);
2065
2066 if (cap)
2067 req->r_sent_on_mseq = cap->mseq;
2068 else
2069 req->r_sent_on_mseq = -1;
2070 }
2f2dc053
SW		 2071 dout("prepare_send_request %p tid %lld %s (attempt %d)\n", req,
2072 req->r_tid, ceph_mds_op_name(req->r_op), req->r_attempts);
2073
01a92f17 2074 if (req->r_got_unsafe) {
c5c9a0bf 2075 void *p;
01a92f17
SW		 2076 /*
2077 * Replay. Do not regenerate message (and rebuild
2078 * paths, etc.); just use the original message.
2079 * Rebuilding paths will break for renames because
2080 * d_move mangles the src name.
2081 */
2082 msg = req->r_request;
2083 rhead = msg->front.iov_base;
2084
2085 flags = le32_to_cpu(rhead->flags);
2086 flags |= CEPH_MDS_FLAG_REPLAY;
2087 rhead->flags = cpu_to_le32(flags);
2088
2089 if (req->r_target_inode)
2090 rhead->ino = cpu_to_le64(ceph_ino(req->r_target_inode));
2091
2092 rhead->num_retry = req->r_attempts - 1;
e979cf50
SW		 2093
2094 /* remove cap/dentry releases from message */
2095 rhead->num_releases = 0;
c5c9a0bf
YZ		 2096
2097 /* time stamp */
2098 p = msg->front.iov_base + req->r_request_release_offset;
1f041a89
YZ		 2099 {
2100 struct ceph_timespec ts;
2101 ceph_encode_timespec(&ts, &req->r_stamp);
2102 ceph_encode_copy(&p, &ts, sizeof(ts));
2103 }
c5c9a0bf
YZ		 2104
2105 msg->front.iov_len = p - msg->front.iov_base;
2106 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
01a92f17
SW		 2107 return 0;
2108 }
2109
2f2dc053
SW		 2110 if (req->r_request) {
2111 ceph_msg_put(req->r_request);
2112 req->r_request = NULL;
2113 }
6e6f0923 2114 msg = create_request_message(mdsc, req, mds, drop_cap_releases);
2f2dc053 2115 if (IS_ERR(msg)) {
e1518c7c 2116 req->r_err = PTR_ERR(msg);
a79832f2 2117 return PTR_ERR(msg);
2f2dc053
SW		 2118 }
2119 req->r_request = msg;
2120
2121 rhead = msg->front.iov_base;
2f2dc053
SW		 2122 rhead->oldest_client_tid = cpu_to_le64(__get_oldest_tid(mdsc));
2123 if (req->r_got_unsafe)
2124 flags |= CEPH_MDS_FLAG_REPLAY;
2125 if (req->r_locked_dir)
2126 flags |= CEPH_MDS_FLAG_WANT_DENTRY;
2127 rhead->flags = cpu_to_le32(flags);
2128 rhead->num_fwd = req->r_num_fwd;
2129 rhead->num_retry = req->r_attempts - 1;
01a92f17 2130 rhead->ino = 0;
2f2dc053
SW		 2131
2132 dout(" r_locked_dir = %p\n", req->r_locked_dir);
2f2dc053
SW		 2133 return 0;
2134}
2135
2136/*
2137 * send request, or put it on the appropriate wait list.
2138 */
2139static int __do_request(struct ceph_mds_client *mdsc,
2140 struct ceph_mds_request *req)
2141{
2142 struct ceph_mds_session *session = NULL;
2143 int mds = -1;
48fec5d0 2144 int err = 0;
2f2dc053 2145
eb1b8af3
YZ		 2146 if (req->r_err || req->r_got_result) {
2147 if (req->r_aborted)
2148 __unregister_request(mdsc, req);
2f2dc053 2149 goto out;
eb1b8af3 2150 }
2f2dc053
SW		 2151
2152 if (req->r_timeout &&
2153 time_after_eq(jiffies, req->r_started + req->r_timeout)) {
2154 dout("do_request timed out\n");
2155 err = -EIO;
2156 goto finish;
2157 }
48fec5d0
YZ		 2158 if (ACCESS_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_SHUTDOWN) {
2159 dout("do_request forced umount\n");
2160 err = -EIO;
2161 goto finish;
2162 }
2f2dc053 2163
dc69e2e9
SW		 2164 put_request_session(req);
2165
2f2dc053
SW		 2166 mds = __choose_mds(mdsc, req);
2167 if (mds < 0 ||
2168 ceph_mdsmap_get_state(mdsc->mdsmap, mds) < CEPH_MDS_STATE_ACTIVE) {
2169 dout("do_request no mds or not active, waiting for map\n");
2170 list_add(&req->r_wait, &mdsc->waiting_for_map);
2171 goto out;
2172 }
2173
2174 /* get, open session */
2175 session = __ceph_lookup_mds_session(mdsc, mds);
9c423956 2176 if (!session) {
2f2dc053 2177 session = register_session(mdsc, mds);
9c423956
SW		 2178 if (IS_ERR(session)) {
2179 err = PTR_ERR(session);
2180 goto finish;
2181 }
2182 }
dc69e2e9
SW		 2183 req->r_session = get_session(session);
2184
2f2dc053 2185 dout("do_request mds%d session %p state %s\n", mds, session,
a687ecaf 2186 ceph_session_state_name(session->s_state));
2f2dc053
SW		 2187 if (session->s_state != CEPH_MDS_SESSION_OPEN &&
2188 session->s_state != CEPH_MDS_SESSION_HUNG) {
2189 if (session->s_state == CEPH_MDS_SESSION_NEW ||
2190 session->s_state == CEPH_MDS_SESSION_CLOSING)
2191 __open_session(mdsc, session);
2192 list_add(&req->r_wait, &session->s_waiting);
2193 goto out_session;
2194 }
2195
2196 /* send request */
2f2dc053
SW		 2197 req->r_resend_mds = -1; /* forget any previous mds hint */
2198
2199 if (req->r_request_started == 0) /* note request start time */
2200 req->r_request_started = jiffies;
2201
6e6f0923 2202 err = __prepare_send_request(mdsc, req, mds, false);
2f2dc053
SW		 2203 if (!err) {
2204 ceph_msg_get(req->r_request);
2205 ceph_con_send(&session->s_con, req->r_request);
2206 }
2207
2208out_session:
2209 ceph_put_mds_session(session);
48fec5d0
YZ		 2210finish:
2211 if (err) {
2212 dout("__do_request early error %d\n", err);
2213 req->r_err = err;
2214 complete_request(mdsc, req);
2215 __unregister_request(mdsc, req);
2216 }
2f2dc053
SW		 2217out:
2218 return err;
2f2dc053
SW		 2219}
2220
2221/*
2222 * called under mdsc->mutex
2223 */
2224static void __wake_requests(struct ceph_mds_client *mdsc,
2225 struct list_head *head)
2226{
ed75ec2c
YZ		 2227 struct ceph_mds_request *req;
2228 LIST_HEAD(tmp_list);
2229
2230 list_splice_init(head, &tmp_list);
2f2dc053 2231
ed75ec2c
YZ		 2232 while (!list_empty(&tmp_list)) {
2233 req = list_entry(tmp_list.next,
2234 struct ceph_mds_request, r_wait);
2f2dc053 2235 list_del_init(&req->r_wait);
7971bd92 2236 dout(" wake request %p tid %llu\n", req, req->r_tid);
2f2dc053
SW		 2237 __do_request(mdsc, req);
2238 }
2239}
2240
2241/*
2242 * Wake up threads with requests pending for @mds, so that they can
29790f26 2243 * resubmit their requests to a possibly different mds.
2f2dc053 2244 */
29790f26 2245static void kick_requests(struct ceph_mds_client *mdsc, int mds)
2f2dc053 2246{
44ca18f2 2247 struct ceph_mds_request *req;
282c1052 2248 struct rb_node *p = rb_first(&mdsc->request_tree);
2f2dc053
SW		 2249
2250 dout("kick_requests mds%d\n", mds);
282c1052 2251 while (p) {
44ca18f2 2252 req = rb_entry(p, struct ceph_mds_request, r_node);
282c1052 2253 p = rb_next(p);
44ca18f2
SW		 2254 if (req->r_got_unsafe)
2255 continue;
3de22be6
YZ		 2256 if (req->r_attempts > 0)
2257 continue; /* only new requests */
44ca18f2
SW		 2258 if (req->r_session &&
2259 req->r_session->s_mds == mds) {
2260 dout(" kicking tid %llu\n", req->r_tid);
03974e81 2261 list_del_init(&req->r_wait);
44ca18f2 2262 __do_request(mdsc, req);
2f2dc053
SW		 2263 }
2264 }
2265}
2266
2267void ceph_mdsc_submit_request(struct ceph_mds_client *mdsc,
2268 struct ceph_mds_request *req)
2269{
2270 dout("submit_request on %p\n", req);
2271 mutex_lock(&mdsc->mutex);
2272 __register_request(mdsc, req, NULL);
2273 __do_request(mdsc, req);
2274 mutex_unlock(&mdsc->mutex);
2275}
2276
2277/*
2278 * Synchrously perform an mds request. Take care of all of the
2279 * session setup, forwarding, retry details.
2280 */
2281int ceph_mdsc_do_request(struct ceph_mds_client *mdsc,
2282 struct inode *dir,
2283 struct ceph_mds_request *req)
2284{
2285 int err;
2286
2287 dout("do_request on %p\n", req);
2288
2289 /* take CAP_PIN refs for r_inode, r_locked_dir, r_old_dentry */
2290 if (req->r_inode)
2291 ceph_get_cap_refs(ceph_inode(req->r_inode), CEPH_CAP_PIN);
2292 if (req->r_locked_dir)
2293 ceph_get_cap_refs(ceph_inode(req->r_locked_dir), CEPH_CAP_PIN);
844d87c3 2294 if (req->r_old_dentry_dir)
41b02e1f
SW		 2295 ceph_get_cap_refs(ceph_inode(req->r_old_dentry_dir),
2296 CEPH_CAP_PIN);
2f2dc053
SW		 2297
2298 /* issue */
2299 mutex_lock(&mdsc->mutex);
2300 __register_request(mdsc, req, dir);
2301 __do_request(mdsc, req);
2302
e1518c7c
SW		 2303 if (req->r_err) {
2304 err = req->r_err;
e1518c7c 2305 goto out;
2f2dc053
SW		 2306 }
2307
e1518c7c
SW		 2308 /* wait */
2309 mutex_unlock(&mdsc->mutex);
2310 dout("do_request waiting\n");
5be73034 2311 if (!req->r_timeout && req->r_wait_for_completion) {
9280be24 2312 err = req->r_wait_for_completion(mdsc, req);
e1518c7c 2313 } else {
5be73034
ID		 2314 long timeleft = wait_for_completion_killable_timeout(
2315 &req->r_completion,
2316 ceph_timeout_jiffies(req->r_timeout));
2317 if (timeleft > 0)
2318 err = 0;
2319 else if (!timeleft)
2320 err = -EIO; /* timed out */
2321 else
2322 err = timeleft; /* killed */
e1518c7c
SW		 2323 }
2324 dout("do_request waited, got %d\n", err);
2325 mutex_lock(&mdsc->mutex);
5b1daecd 2326
e1518c7c
SW		 2327 /* only abort if we didn't race with a real reply */
2328 if (req->r_got_result) {
2329 err = le32_to_cpu(req->r_reply_info.head->result);
2330 } else if (err < 0) {
2331 dout("aborted request %lld with %d\n", req->r_tid, err);
b4556396
SW		 2332
2333 /*
2334 * ensure we aren't running concurrently with
2335 * ceph_fill_trace or ceph_readdir_prepopulate, which
2336 * rely on locks (dir mutex) held by our caller.
2337 */
2338 mutex_lock(&req->r_fill_mutex);
e1518c7c
SW		 2339 req->r_err = err;
2340 req->r_aborted = true;
b4556396 2341 mutex_unlock(&req->r_fill_mutex);
5b1daecd 2342
e1518c7c 2343 if (req->r_locked_dir &&
167c9e35
SW		 2344 (req->r_op & CEPH_MDS_OP_WRITE))
2345 ceph_invalidate_dir_request(req);
2f2dc053 2346 } else {
e1518c7c 2347 err = req->r_err;
2f2dc053 2348 }
2f2dc053 2349
e1518c7c
SW		 2350out:
2351 mutex_unlock(&mdsc->mutex);
2f2dc053
SW		 2352 dout("do_request %p done, result %d\n", req, err);
2353 return err;
2354}
2355
167c9e35 2356/*
2f276c51 2357 * Invalidate dir's completeness, dentry lease state on an aborted MDS
167c9e35
SW		 2358 * namespace request.
2359 */
2360void ceph_invalidate_dir_request(struct ceph_mds_request *req)
2361{
2362 struct inode *inode = req->r_locked_dir;
167c9e35 2363
2f276c51 2364 dout("invalidate_dir_request %p (complete, lease(s))\n", inode);
167c9e35 2365
2f276c51 2366 ceph_dir_clear_complete(inode);
167c9e35
SW		 2367 if (req->r_dentry)
2368 ceph_invalidate_dentry_lease(req->r_dentry);
2369 if (req->r_old_dentry)
2370 ceph_invalidate_dentry_lease(req->r_old_dentry);
2371}
2372
2f2dc053
SW		 2373/*
2374 * Handle mds reply.
2375 *
2376 * We take the session mutex and parse and process the reply immediately.
2377 * This preserves the logical ordering of replies, capabilities, etc., sent
2378 * by the MDS as they are applied to our local cache.
2379 */
2380static void handle_reply(struct ceph_mds_session *session, struct ceph_msg *msg)
2381{
2382 struct ceph_mds_client *mdsc = session->s_mdsc;
2383 struct ceph_mds_request *req;
2384 struct ceph_mds_reply_head *head = msg->front.iov_base;
2385 struct ceph_mds_reply_info_parsed *rinfo; /* parsed reply info */
982d6011 2386 struct ceph_snap_realm *realm;
2f2dc053
SW		 2387 u64 tid;
2388 int err, result;
2600d2dd 2389 int mds = session->s_mds;
2f2dc053 2390
2f2dc053
SW		 2391 if (msg->front.iov_len < sizeof(*head)) {
2392 pr_err("mdsc_handle_reply got corrupt (short) reply\n");
9ec7cab1 2393 ceph_msg_dump(msg);
2f2dc053
SW		 2394 return;
2395 }
2396
2397 /* get request, session */
6df058c0 2398 tid = le64_to_cpu(msg->hdr.tid);
2f2dc053 2399 mutex_lock(&mdsc->mutex);
fcd00b68 2400 req = lookup_get_request(mdsc, tid);
2f2dc053
SW		 2401 if (!req) {
2402 dout("handle_reply on unknown tid %llu\n", tid);
2403 mutex_unlock(&mdsc->mutex);
2404 return;
2405 }
2406 dout("handle_reply %p\n", req);
2f2dc053
SW		 2407
2408 /* correct session? */
d96d6049 2409 if (req->r_session != session) {
2f2dc053
SW		 2410 pr_err("mdsc_handle_reply got %llu on session mds%d"
2411 " not mds%d\n", tid, session->s_mds,
2412 req->r_session ? req->r_session->s_mds : -1);
2413 mutex_unlock(&mdsc->mutex);
2414 goto out;
2415 }
2416
2417 /* dup? */
2418 if ((req->r_got_unsafe && !head->safe) ||
2419 (req->r_got_safe && head->safe)) {
f3ae1b97 2420 pr_warn("got a dup %s reply on %llu from mds%d\n",
2f2dc053
SW		 2421 head->safe ? "safe" : "unsafe", tid, mds);
2422 mutex_unlock(&mdsc->mutex);
2423 goto out;
2424 }
1550d34e 2425 if (req->r_got_safe) {
f3ae1b97 2426 pr_warn("got unsafe after safe on %llu from mds%d\n",
85792d0d
SW		 2427 tid, mds);
2428 mutex_unlock(&mdsc->mutex);
2429 goto out;
2430 }
2f2dc053
SW		 2431
2432 result = le32_to_cpu(head->result);
2433
2434 /*
e55b71f8
GF		 2435 * Handle an ESTALE
2436 * if we're not talking to the authority, send to them
2437 * if the authority has changed while we weren't looking,
2438 * send to new authority
2439 * Otherwise we just have to return an ESTALE
2f2dc053
SW		 2440 */
2441 if (result == -ESTALE) {
e55b71f8 2442 dout("got ESTALE on request %llu", req->r_tid);
51da8e8c 2443 req->r_resend_mds = -1;
ca18bede 2444 if (req->r_direct_mode != USE_AUTH_MDS) {
e55b71f8
GF		 2445 dout("not using auth, setting for that now");
2446 req->r_direct_mode = USE_AUTH_MDS;
2f2dc053
SW		 2447 __do_request(mdsc, req);
2448 mutex_unlock(&mdsc->mutex);
2449 goto out;
e55b71f8 2450 } else {
ca18bede
YZ		 2451 int mds = __choose_mds(mdsc, req);
2452 if (mds >= 0 && mds != req->r_session->s_mds) {
2453 dout("but auth changed, so resending");
e55b71f8
GF		 2454 __do_request(mdsc, req);
2455 mutex_unlock(&mdsc->mutex);
2456 goto out;
2457 }
2f2dc053 2458 }
e55b71f8 2459 dout("have to return ESTALE on request %llu", req->r_tid);
2f2dc053
SW		 2460 }
2461
e55b71f8 2462
2f2dc053
SW		 2463 if (head->safe) {
2464 req->r_got_safe = true;
2465 __unregister_request(mdsc, req);
2f2dc053
SW		 2466
2467 if (req->r_got_unsafe) {
2468 /*
2469 * We already handled the unsafe response, now do the
2470 * cleanup. No need to examine the response; the MDS
2471 * doesn't include any result info in the safe
2472 * response. And even if it did, there is nothing
2473 * useful we could do with a revised return value.
2474 */
2475 dout("got safe reply %llu, mds%d\n", tid, mds);
2476 list_del_init(&req->r_unsafe_item);
2477
2478 /* last unsafe request during umount? */
44ca18f2 2479 if (mdsc->stopping && !__get_oldest_req(mdsc))
03066f23 2480 complete_all(&mdsc->safe_umount_waiters);
2f2dc053
SW		 2481 mutex_unlock(&mdsc->mutex);
2482 goto out;
2483 }
e1518c7c 2484 } else {
2f2dc053
SW		 2485 req->r_got_unsafe = true;
2486 list_add_tail(&req->r_unsafe_item, &req->r_session->s_unsafe);
4c06ace8
YZ		 2487 if (req->r_unsafe_dir) {
2488 struct ceph_inode_info *ci =
2489 ceph_inode(req->r_unsafe_dir);
2490 spin_lock(&ci->i_unsafe_lock);
2491 list_add_tail(&req->r_unsafe_dir_item,
2492 &ci->i_unsafe_dirops);
2493 spin_unlock(&ci->i_unsafe_lock);
2494 }
2f2dc053
SW		 2495 }
2496
2497 dout("handle_reply tid %lld result %d\n", tid, result);
2498 rinfo = &req->r_reply_info;
14303d20 2499 err = parse_reply_info(msg, rinfo, session->s_con.peer_features);
2f2dc053
SW		 2500 mutex_unlock(&mdsc->mutex);
2501
2502 mutex_lock(&session->s_mutex);
2503 if (err < 0) {
25933abd 2504 pr_err("mdsc_handle_reply got corrupt reply mds%d(tid:%lld)\n", mds, tid);
9ec7cab1 2505 ceph_msg_dump(msg);
2f2dc053
SW		 2506 goto out_err;
2507 }
2508
2509 /* snap trace */
982d6011 2510 realm = NULL;
2f2dc053
SW		 2511 if (rinfo->snapblob_len) {
2512 down_write(&mdsc->snap_rwsem);
2513 ceph_update_snap_trace(mdsc, rinfo->snapblob,
982d6011
YZ		 2514 rinfo->snapblob + rinfo->snapblob_len,
2515 le32_to_cpu(head->op) == CEPH_MDS_OP_RMSNAP,
2516 &realm);
2f2dc053
SW		 2517 downgrade_write(&mdsc->snap_rwsem);
2518 } else {
2519 down_read(&mdsc->snap_rwsem);
2520 }
2521
2522 /* insert trace into our cache */
b4556396 2523 mutex_lock(&req->r_fill_mutex);
315f2408 2524 current->journal_info = req;
3d14c5d2 2525 err = ceph_fill_trace(mdsc->fsc->sb, req, req->r_session);
2f2dc053 2526 if (err == 0) {
6e8575fa 2527 if (result == 0 && (req->r_op == CEPH_MDS_OP_READDIR ||
81c6aea5 2528 req->r_op == CEPH_MDS_OP_LSSNAP))
2f2dc053 2529 ceph_readdir_prepopulate(req, req->r_session);
37151668 2530 ceph_unreserve_caps(mdsc, &req->r_caps_reservation);
2f2dc053 2531 }
315f2408 2532 current->journal_info = NULL;
b4556396 2533 mutex_unlock(&req->r_fill_mutex);
2f2dc053
SW		 2534
2535 up_read(&mdsc->snap_rwsem);
982d6011
YZ		 2536 if (realm)
2537 ceph_put_snap_realm(mdsc, realm);
68cd5b4b
YZ		 2538
2539 if (err == 0 && req->r_got_unsafe && req->r_target_inode) {
2540 struct ceph_inode_info *ci = ceph_inode(req->r_target_inode);
2541 spin_lock(&ci->i_unsafe_lock);
2542 list_add_tail(&req->r_unsafe_target_item, &ci->i_unsafe_iops);
2543 spin_unlock(&ci->i_unsafe_lock);
2544 }
2f2dc053 2545out_err:
e1518c7c
SW		 2546 mutex_lock(&mdsc->mutex);
2547 if (!req->r_aborted) {
2548 if (err) {
2549 req->r_err = err;
2550 } else {
5fdb1389 2551 req->r_reply = ceph_msg_get(msg);
e1518c7c
SW		 2552 req->r_got_result = true;
2553 }
2f2dc053 2554 } else {
e1518c7c 2555 dout("reply arrived after request %lld was aborted\n", tid);
2f2dc053 2556 }
e1518c7c 2557 mutex_unlock(&mdsc->mutex);
2f2dc053 2558
2f2dc053
SW		 2559 mutex_unlock(&session->s_mutex);
2560
2561 /* kick calling process */
2562 complete_request(mdsc, req);
2563out:
2564 ceph_mdsc_put_request(req);
2565 return;
2566}
2567
2568
2569
2570/*
2571 * handle mds notification that our request has been forwarded.
2572 */
2600d2dd
SW		 2573static void handle_forward(struct ceph_mds_client *mdsc,
2574 struct ceph_mds_session *session,
2575 struct ceph_msg *msg)
2f2dc053
SW		 2576{
2577 struct ceph_mds_request *req;
a1ea787c 2578 u64 tid = le64_to_cpu(msg->hdr.tid);
2f2dc053
SW		 2579 u32 next_mds;
2580 u32 fwd_seq;
2f2dc053
SW		 2581 int err = -EINVAL;
2582 void *p = msg->front.iov_base;
2583 void *end = p + msg->front.iov_len;
2f2dc053 2584
a1ea787c 2585 ceph_decode_need(&p, end, 2*sizeof(u32), bad);
c89136ea
SW		 2586 next_mds = ceph_decode_32(&p);
2587 fwd_seq = ceph_decode_32(&p);
2f2dc053
SW		 2588
2589 mutex_lock(&mdsc->mutex);
fcd00b68 2590 req = lookup_get_request(mdsc, tid);
2f2dc053 2591 if (!req) {
2a8e5e36 2592 dout("forward tid %llu to mds%d - req dne\n", tid, next_mds);
2f2dc053
SW		 2593 goto out; /* dup reply? */
2594 }
2595
2a8e5e36
SW		 2596 if (req->r_aborted) {
2597 dout("forward tid %llu aborted, unregistering\n", tid);
2598 __unregister_request(mdsc, req);
2599 } else if (fwd_seq <= req->r_num_fwd) {
2600 dout("forward tid %llu to mds%d - old seq %d <= %d\n",
2f2dc053
SW		 2601 tid, next_mds, req->r_num_fwd, fwd_seq);
2602 } else {
2603 /* resend. forward race not possible; mds would drop */
2a8e5e36
SW		 2604 dout("forward tid %llu to mds%d (we resend)\n", tid, next_mds);
2605 BUG_ON(req->r_err);
2606 BUG_ON(req->r_got_result);
3de22be6 2607 req->r_attempts = 0;
2f2dc053
SW		 2608 req->r_num_fwd = fwd_seq;
2609 req->r_resend_mds = next_mds;
2610 put_request_session(req);
2611 __do_request(mdsc, req);
2612 }
2613 ceph_mdsc_put_request(req);
2614out:
2615 mutex_unlock(&mdsc->mutex);
2616 return;
2617
2618bad:
2619 pr_err("mdsc_handle_forward decode error err=%d\n", err);
2620}
2621
2622/*
2623 * handle a mds session control message
2624 */
2625static void handle_session(struct ceph_mds_session *session,
2626 struct ceph_msg *msg)
2627{
2628 struct ceph_mds_client *mdsc = session->s_mdsc;
2629 u32 op;
2630 u64 seq;
2600d2dd 2631 int mds = session->s_mds;
2f2dc053
SW		 2632 struct ceph_mds_session_head *h = msg->front.iov_base;
2633 int wake = 0;
2634
2f2dc053
SW		 2635 /* decode */
2636 if (msg->front.iov_len != sizeof(*h))
2637 goto bad;
2638 op = le32_to_cpu(h->op);
2639 seq = le64_to_cpu(h->seq);
2640
2641 mutex_lock(&mdsc->mutex);
2600d2dd
SW		 2642 if (op == CEPH_SESSION_CLOSE)
2643 __unregister_session(mdsc, session);
2f2dc053
SW		 2644 /* FIXME: this ttl calculation is generous */
2645 session->s_ttl = jiffies + HZ*mdsc->mdsmap->m_session_autoclose;
2646 mutex_unlock(&mdsc->mutex);
2647
2648 mutex_lock(&session->s_mutex);
2649
2650 dout("handle_session mds%d %s %p state %s seq %llu\n",
2651 mds, ceph_session_op_name(op), session,
a687ecaf 2652 ceph_session_state_name(session->s_state), seq);
2f2dc053
SW		 2653
2654 if (session->s_state == CEPH_MDS_SESSION_HUNG) {
2655 session->s_state = CEPH_MDS_SESSION_OPEN;
2656 pr_info("mds%d came back\n", session->s_mds);
2657 }
2658
2659 switch (op) {
2660 case CEPH_SESSION_OPEN:
29790f26
SW		 2661 if (session->s_state == CEPH_MDS_SESSION_RECONNECTING)
2662 pr_info("mds%d reconnect success\n", session->s_mds);
2f2dc053
SW		 2663 session->s_state = CEPH_MDS_SESSION_OPEN;
2664 renewed_caps(mdsc, session, 0);
2665 wake = 1;
2666 if (mdsc->stopping)
2667 __close_session(mdsc, session);
2668 break;
2669
2670 case CEPH_SESSION_RENEWCAPS:
2671 if (session->s_renew_seq == seq)
2672 renewed_caps(mdsc, session, 1);
2673 break;
2674
2675 case CEPH_SESSION_CLOSE:
29790f26
SW		 2676 if (session->s_state == CEPH_MDS_SESSION_RECONNECTING)
2677 pr_info("mds%d reconnect denied\n", session->s_mds);
1c841a96 2678 cleanup_session_requests(mdsc, session);
2f2dc053 2679 remove_session_caps(session);
656e4382 2680 wake = 2; /* for good measure */
f3c60c59 2681 wake_up_all(&mdsc->session_close_wq);
2f2dc053
SW		 2682 break;
2683
2684 case CEPH_SESSION_STALE:
2685 pr_info("mds%d caps went stale, renewing\n",
2686 session->s_mds);
d8fb02ab 2687 spin_lock(&session->s_gen_ttl_lock);
2f2dc053 2688 session->s_cap_gen++;
1ce208a6 2689 session->s_cap_ttl = jiffies - 1;
d8fb02ab 2690 spin_unlock(&session->s_gen_ttl_lock);
2f2dc053
SW		 2691 send_renew_caps(mdsc, session);
2692 break;
2693
2694 case CEPH_SESSION_RECALL_STATE:
2695 trim_caps(mdsc, session, le32_to_cpu(h->max_caps));
2696 break;
2697
186e4f7a
YZ		 2698 case CEPH_SESSION_FLUSHMSG:
2699 send_flushmsg_ack(mdsc, session, seq);
2700 break;
2701
03f4fcb0
YZ		 2702 case CEPH_SESSION_FORCE_RO:
2703 dout("force_session_readonly %p\n", session);
2704 spin_lock(&session->s_cap_lock);
2705 session->s_readonly = true;
2706 spin_unlock(&session->s_cap_lock);
2707 wake_up_session_caps(session, 0);
2708 break;
2709
2f2dc053
SW		 2710 default:
2711 pr_err("mdsc_handle_session bad op %d mds%d\n", op, mds);
2712 WARN_ON(1);
2713 }
2714
2715 mutex_unlock(&session->s_mutex);
2716 if (wake) {
2717 mutex_lock(&mdsc->mutex);
2718 __wake_requests(mdsc, &session->s_waiting);
656e4382
YZ		 2719 if (wake == 2)
2720 kick_requests(mdsc, mds);
2f2dc053
SW		 2721 mutex_unlock(&mdsc->mutex);
2722 }
2723 return;
2724
2725bad:
2726 pr_err("mdsc_handle_session corrupt message mds%d len %d\n", mds,
2727 (int)msg->front.iov_len);
9ec7cab1 2728 ceph_msg_dump(msg);
2f2dc053
SW		 2729 return;
2730}
2731
2732
2733/*
2734 * called under session->mutex.
2735 */
2736static void replay_unsafe_requests(struct ceph_mds_client *mdsc,
2737 struct ceph_mds_session *session)
2738{
2739 struct ceph_mds_request *req, *nreq;
3de22be6 2740 struct rb_node *p;
2f2dc053
SW		 2741 int err;
2742
2743 dout("replay_unsafe_requests mds%d\n", session->s_mds);
2744
2745 mutex_lock(&mdsc->mutex);
2746 list_for_each_entry_safe(req, nreq, &session->s_unsafe, r_unsafe_item) {
6e6f0923 2747 err = __prepare_send_request(mdsc, req, session->s_mds, true);
2f2dc053
SW		 2748 if (!err) {
2749 ceph_msg_get(req->r_request);
2750 ceph_con_send(&session->s_con, req->r_request);
2751 }
2752 }
3de22be6
YZ		 2753
2754 /*
2755 * also re-send old requests when MDS enters reconnect stage. So that MDS
2756 * can process completed request in clientreplay stage.
2757 */
2758 p = rb_first(&mdsc->request_tree);
2759 while (p) {
2760 req = rb_entry(p, struct ceph_mds_request, r_node);
2761 p = rb_next(p);
2762 if (req->r_got_unsafe)
2763 continue;
2764 if (req->r_attempts == 0)
2765 continue; /* only old requests */
2766 if (req->r_session &&
2767 req->r_session->s_mds == session->s_mds) {
6e6f0923
YZ		 2768 err = __prepare_send_request(mdsc, req,
2769 session->s_mds, true);
3de22be6
YZ		 2770 if (!err) {
2771 ceph_msg_get(req->r_request);
2772 ceph_con_send(&session->s_con, req->r_request);
2773 }
2774 }
2775 }
2f2dc053
SW		 2776 mutex_unlock(&mdsc->mutex);
2777}
2778
2779/*
2780 * Encode information about a cap for a reconnect with the MDS.
2781 */
2f2dc053
SW		 2782static int encode_caps_cb(struct inode *inode, struct ceph_cap *cap,
2783 void *arg)
2784{
20cb34ae
SW		 2785 union {
2786 struct ceph_mds_cap_reconnect v2;
2787 struct ceph_mds_cap_reconnect_v1 v1;
2788 } rec;
2789 size_t reclen;
2f2dc053 2790 struct ceph_inode_info *ci;
20cb34ae
SW		 2791 struct ceph_reconnect_state *recon_state = arg;
2792 struct ceph_pagelist *pagelist = recon_state->pagelist;
2f2dc053
SW		 2793 char *path;
2794 int pathlen, err;
2795 u64 pathbase;
2796 struct dentry *dentry;
2797
2798 ci = cap->ci;
2799
2800 dout(" adding %p ino %llx.%llx cap %p %lld %s\n",
2801 inode, ceph_vinop(inode), cap, cap->cap_id,
2802 ceph_cap_string(cap->issued));
93cea5be
SW		 2803 err = ceph_pagelist_encode_64(pagelist, ceph_ino(inode));
2804 if (err)
2805 return err;
2f2dc053
SW		 2806
2807 dentry = d_find_alias(inode);
2808 if (dentry) {
2809 path = ceph_mdsc_build_path(dentry, &pathlen, &pathbase, 0);
2810 if (IS_ERR(path)) {
2811 err = PTR_ERR(path);
e072f8aa 2812 goto out_dput;
2f2dc053
SW		 2813 }
2814 } else {
2815 path = NULL;
2816 pathlen = 0;
2817 }
93cea5be
SW		 2818 err = ceph_pagelist_encode_string(pagelist, path, pathlen);
2819 if (err)
e072f8aa 2820 goto out_free;
2f2dc053 2821
be655596 2822 spin_lock(&ci->i_ceph_lock);
2f2dc053
SW		 2823 cap->seq = 0; /* reset cap seq */
2824 cap->issue_seq = 0; /* and issue_seq */
667ca05c 2825 cap->mseq = 0; /* and migrate_seq */
99a9c273 2826 cap->cap_gen = cap->session->s_cap_gen;
20cb34ae
SW		 2827
2828 if (recon_state->flock) {
2829 rec.v2.cap_id = cpu_to_le64(cap->cap_id);
2830 rec.v2.wanted = cpu_to_le32(__ceph_caps_wanted(ci));
2831 rec.v2.issued = cpu_to_le32(cap->issued);
2832 rec.v2.snaprealm = cpu_to_le64(ci->i_snap_realm->ino);
2833 rec.v2.pathbase = cpu_to_le64(pathbase);
2834 rec.v2.flock_len = 0;
2835 reclen = sizeof(rec.v2);
2836 } else {
2837 rec.v1.cap_id = cpu_to_le64(cap->cap_id);
2838 rec.v1.wanted = cpu_to_le32(__ceph_caps_wanted(ci));
2839 rec.v1.issued = cpu_to_le32(cap->issued);
2840 rec.v1.size = cpu_to_le64(inode->i_size);
2841 ceph_encode_timespec(&rec.v1.mtime, &inode->i_mtime);
2842 ceph_encode_timespec(&rec.v1.atime, &inode->i_atime);
2843 rec.v1.snaprealm = cpu_to_le64(ci->i_snap_realm->ino);
2844 rec.v1.pathbase = cpu_to_le64(pathbase);
2845 reclen = sizeof(rec.v1);
2846 }
be655596 2847 spin_unlock(&ci->i_ceph_lock);
2f2dc053 2848
40819f6f
GF		 2849 if (recon_state->flock) {
2850 int num_fcntl_locks, num_flock_locks;
39be95e9
JS		 2851 struct ceph_filelock *flocks;
2852
2853encode_again:
39be95e9 2854 ceph_count_locks(inode, &num_fcntl_locks, &num_flock_locks);
39be95e9
JS		 2855 flocks = kmalloc((num_fcntl_locks+num_flock_locks) *
2856 sizeof(struct ceph_filelock), GFP_NOFS);
2857 if (!flocks) {
2858 err = -ENOMEM;
2859 goto out_free;
2860 }
39be95e9
JS		 2861 err = ceph_encode_locks_to_buffer(inode, flocks,
2862 num_fcntl_locks,
2863 num_flock_locks);
39be95e9
JS		 2864 if (err) {
2865 kfree(flocks);
2866 if (err == -ENOSPC)
2867 goto encode_again;
2868 goto out_free;
2869 }
2870 /*
2871 * number of encoded locks is stable, so copy to pagelist
2872 */
2873 rec.v2.flock_len = cpu_to_le32(2*sizeof(u32) +
2874 (num_fcntl_locks+num_flock_locks) *
2875 sizeof(struct ceph_filelock));
2876 err = ceph_pagelist_append(pagelist, &rec, reclen);
2877 if (!err)
2878 err = ceph_locks_to_pagelist(flocks, pagelist,
2879 num_fcntl_locks,
2880 num_flock_locks);
2881 kfree(flocks);
3612abbd
SW		 2882 } else {
2883 err = ceph_pagelist_append(pagelist, &rec, reclen);
40819f6f 2884 }
44c99757
YZ		 2885
2886 recon_state->nr_caps++;
e072f8aa 2887out_free:
2f2dc053 2888 kfree(path);
e072f8aa 2889out_dput:
2f2dc053 2890 dput(dentry);
93cea5be 2891 return err;
2f2dc053
SW		 2892}
2893
2894
2895/*
2896 * If an MDS fails and recovers, clients need to reconnect in order to
2897 * reestablish shared state. This includes all caps issued through
2898 * this session _and_ the snap_realm hierarchy. Because it's not
2899 * clear which snap realms the mds cares about, we send everything we
2900 * know about.. that ensures we'll then get any new info the
2901 * recovering MDS might have.
2902 *
2903 * This is a relatively heavyweight operation, but it's rare.
2904 *
2905 * called with mdsc->mutex held.
2906 */
34b6c855
SW		 2907static void send_mds_reconnect(struct ceph_mds_client *mdsc,
2908 struct ceph_mds_session *session)
2f2dc053 2909{
2f2dc053 2910 struct ceph_msg *reply;
a105f00c 2911 struct rb_node *p;
34b6c855 2912 int mds = session->s_mds;
9abf82b8 2913 int err = -ENOMEM;
44c99757 2914 int s_nr_caps;
93cea5be 2915 struct ceph_pagelist *pagelist;
20cb34ae 2916 struct ceph_reconnect_state recon_state;
2f2dc053 2917
34b6c855 2918 pr_info("mds%d reconnect start\n", mds);
2f2dc053 2919
93cea5be
SW		 2920 pagelist = kmalloc(sizeof(*pagelist), GFP_NOFS);
2921 if (!pagelist)
2922 goto fail_nopagelist;
2923 ceph_pagelist_init(pagelist);
2924
b61c2763 2925 reply = ceph_msg_new(CEPH_MSG_CLIENT_RECONNECT, 0, GFP_NOFS, false);
a79832f2 2926 if (!reply)
93cea5be 2927 goto fail_nomsg;
93cea5be 2928
34b6c855
SW		 2929 mutex_lock(&session->s_mutex);
2930 session->s_state = CEPH_MDS_SESSION_RECONNECTING;
2931 session->s_seq = 0;
2f2dc053 2932
2f2dc053 2933 dout("session %p state %s\n", session,
a687ecaf 2934 ceph_session_state_name(session->s_state));
2f2dc053 2935
99a9c273
YZ		 2936 spin_lock(&session->s_gen_ttl_lock);
2937 session->s_cap_gen++;
2938 spin_unlock(&session->s_gen_ttl_lock);
2939
2940 spin_lock(&session->s_cap_lock);
03f4fcb0
YZ		 2941 /* don't know if session is readonly */
2942 session->s_readonly = 0;
99a9c273
YZ		 2943 /*
2944 * notify __ceph_remove_cap() that we are composing cap reconnect.
2945 * If a cap get released before being added to the cap reconnect,
2946 * __ceph_remove_cap() should skip queuing cap release.
2947 */
2948 session->s_cap_reconnect = 1;
e01a5946 2949 /* drop old cap expires; we're about to reestablish that state */
745a8e3b 2950 cleanup_cap_releases(mdsc, session);
e01a5946 2951
5d23371f 2952 /* trim unused caps to reduce MDS's cache rejoin time */
c0bd50e2
YZ		 2953 if (mdsc->fsc->sb->s_root)
2954 shrink_dcache_parent(mdsc->fsc->sb->s_root);
5d23371f
YZ		 2955
2956 ceph_con_close(&session->s_con);
2957 ceph_con_open(&session->s_con,
2958 CEPH_ENTITY_TYPE_MDS, mds,
2959 ceph_mdsmap_get_addr(mdsc->mdsmap, mds));
2960
2961 /* replay unsafe requests */
2962 replay_unsafe_requests(mdsc, session);
2963
2964 down_read(&mdsc->snap_rwsem);
2965
2f2dc053 2966 /* traverse this session's caps */
44c99757
YZ		 2967 s_nr_caps = session->s_nr_caps;
2968 err = ceph_pagelist_encode_32(pagelist, s_nr_caps);
93cea5be
SW		 2969 if (err)
2970 goto fail;
20cb34ae 2971
44c99757 2972 recon_state.nr_caps = 0;
20cb34ae
SW		 2973 recon_state.pagelist = pagelist;
2974 recon_state.flock = session->s_con.peer_features & CEPH_FEATURE_FLOCK;
2975 err = iterate_session_caps(session, encode_caps_cb, &recon_state);
2f2dc053 2976 if (err < 0)
9abf82b8 2977 goto fail;
2f2dc053 2978
99a9c273
YZ		 2979 spin_lock(&session->s_cap_lock);
2980 session->s_cap_reconnect = 0;
2981 spin_unlock(&session->s_cap_lock);
2982
2f2dc053
SW		 2983 /*
2984 * snaprealms. we provide mds with the ino, seq (version), and
2985 * parent for all of our realms. If the mds has any newer info,
2986 * it will tell us.
2987 */
a105f00c
SW		 2988 for (p = rb_first(&mdsc->snap_realms); p; p = rb_next(p)) {
2989 struct ceph_snap_realm *realm =
2990 rb_entry(p, struct ceph_snap_realm, node);
93cea5be 2991 struct ceph_mds_snaprealm_reconnect sr_rec;
2f2dc053
SW		 2992
2993 dout(" adding snap realm %llx seq %lld parent %llx\n",
2994 realm->ino, realm->seq, realm->parent_ino);
93cea5be
SW		 2995 sr_rec.ino = cpu_to_le64(realm->ino);
2996 sr_rec.seq = cpu_to_le64(realm->seq);
2997 sr_rec.parent = cpu_to_le64(realm->parent_ino);
2998 err = ceph_pagelist_append(pagelist, &sr_rec, sizeof(sr_rec));
2999 if (err)
3000 goto fail;
2f2dc053 3001 }
2f2dc053 3002
20cb34ae
SW		 3003 if (recon_state.flock)
3004 reply->hdr.version = cpu_to_le16(2);
44c99757
YZ		 3005
3006 /* raced with cap release? */
3007 if (s_nr_caps != recon_state.nr_caps) {
3008 struct page *page = list_first_entry(&pagelist->head,
3009 struct page, lru);
3010 __le32 *addr = kmap_atomic(page);
3011 *addr = cpu_to_le32(recon_state.nr_caps);
3012 kunmap_atomic(addr);
ebf18f47 3013 }
44c99757
YZ		 3014
3015 reply->hdr.data_len = cpu_to_le32(pagelist->length);
3016 ceph_msg_data_add_pagelist(reply, pagelist);
e548e9b9
YZ		 3017
3018 ceph_early_kick_flushing_caps(mdsc, session);
3019
2f2dc053
SW		 3020 ceph_con_send(&session->s_con, reply);
3021
9abf82b8
SW		 3022 mutex_unlock(&session->s_mutex);
3023
3024 mutex_lock(&mdsc->mutex);
3025 __wake_requests(mdsc, &session->s_waiting);
3026 mutex_unlock(&mdsc->mutex);
3027
2f2dc053 3028 up_read(&mdsc->snap_rwsem);
2f2dc053
SW		 3029 return;
3030
93cea5be 3031fail:
2f2dc053 3032 ceph_msg_put(reply);
9abf82b8
SW		 3033 up_read(&mdsc->snap_rwsem);
3034 mutex_unlock(&session->s_mutex);
93cea5be
SW		 3035fail_nomsg:
3036 ceph_pagelist_release(pagelist);
93cea5be 3037fail_nopagelist:
9abf82b8 3038 pr_err("error %d preparing reconnect for mds%d\n", err, mds);
9abf82b8 3039 return;
2f2dc053
SW		 3040}
3041
3042
3043/*
3044 * compare old and new mdsmaps, kicking requests
3045 * and closing out old connections as necessary
3046 *
3047 * called under mdsc->mutex.
3048 */
3049static void check_new_map(struct ceph_mds_client *mdsc,
3050 struct ceph_mdsmap *newmap,
3051 struct ceph_mdsmap *oldmap)
3052{
3053 int i;
3054 int oldstate, newstate;
3055 struct ceph_mds_session *s;
3056
3057 dout("check_new_map new %u old %u\n",
3058 newmap->m_epoch, oldmap->m_epoch);
3059
3060 for (i = 0; i < oldmap->m_max_mds && i < mdsc->max_sessions; i++) {
3061 if (mdsc->sessions[i] == NULL)
3062 continue;
3063 s = mdsc->sessions[i];
3064 oldstate = ceph_mdsmap_get_state(oldmap, i);
3065 newstate = ceph_mdsmap_get_state(newmap, i);
3066
0deb01c9 3067 dout("check_new_map mds%d state %s%s -> %s%s (session %s)\n",
2f2dc053 3068 i, ceph_mds_state_name(oldstate),
0deb01c9 3069 ceph_mdsmap_is_laggy(oldmap, i) ? " (laggy)" : "",
2f2dc053 3070 ceph_mds_state_name(newstate),
0deb01c9 3071 ceph_mdsmap_is_laggy(newmap, i) ? " (laggy)" : "",
a687ecaf 3072 ceph_session_state_name(s->s_state));
2f2dc053 3073
3e8f43a0
YZ		 3074 if (i >= newmap->m_max_mds ||
3075 memcmp(ceph_mdsmap_get_addr(oldmap, i),
2f2dc053
SW		 3076 ceph_mdsmap_get_addr(newmap, i),
3077 sizeof(struct ceph_entity_addr))) {
3078 if (s->s_state == CEPH_MDS_SESSION_OPENING) {
3079 /* the session never opened, just close it
3080 * out now */
3081 __wake_requests(mdsc, &s->s_waiting);
2600d2dd 3082 __unregister_session(mdsc, s);
2f2dc053
SW		 3083 } else {
3084 /* just close it */
3085 mutex_unlock(&mdsc->mutex);
3086 mutex_lock(&s->s_mutex);
3087 mutex_lock(&mdsc->mutex);
3088 ceph_con_close(&s->s_con);
3089 mutex_unlock(&s->s_mutex);
3090 s->s_state = CEPH_MDS_SESSION_RESTARTING;
3091 }
2f2dc053
SW		 3092 } else if (oldstate == newstate) {
3093 continue; /* nothing new with this mds */
3094 }
3095
3096 /*
3097 * send reconnect?
3098 */
3099 if (s->s_state == CEPH_MDS_SESSION_RESTARTING &&
34b6c855
SW		 3100 newstate >= CEPH_MDS_STATE_RECONNECT) {
3101 mutex_unlock(&mdsc->mutex);
3102 send_mds_reconnect(mdsc, s);
3103 mutex_lock(&mdsc->mutex);
3104 }
2f2dc053
SW		 3105
3106 /*
29790f26 3107 * kick request on any mds that has gone active.
2f2dc053
SW		 3108 */
3109 if (oldstate < CEPH_MDS_STATE_ACTIVE &&
3110 newstate >= CEPH_MDS_STATE_ACTIVE) {
29790f26
SW		 3111 if (oldstate != CEPH_MDS_STATE_CREATING &&
3112 oldstate != CEPH_MDS_STATE_STARTING)
3113 pr_info("mds%d recovery completed\n", s->s_mds);
3114 kick_requests(mdsc, i);
2f2dc053 3115 ceph_kick_flushing_caps(mdsc, s);
0dc2570f 3116 wake_up_session_caps(s, 1);
2f2dc053
SW		 3117 }
3118 }
cb170a22
SW		 3119
3120 for (i = 0; i < newmap->m_max_mds && i < mdsc->max_sessions; i++) {
3121 s = mdsc->sessions[i];
3122 if (!s)
3123 continue;
3124 if (!ceph_mdsmap_is_laggy(newmap, i))
3125 continue;
3126 if (s->s_state == CEPH_MDS_SESSION_OPEN ||
3127 s->s_state == CEPH_MDS_SESSION_HUNG ||
3128 s->s_state == CEPH_MDS_SESSION_CLOSING) {
3129 dout(" connecting to export targets of laggy mds%d\n",
3130 i);
3131 __open_export_target_sessions(mdsc, s);
3132 }
3133 }
2f2dc053
SW		 3134}
3135
3136
3137
3138/*
3139 * leases
3140 */
3141
3142/*
3143 * caller must hold session s_mutex, dentry->d_lock
3144 */
3145void __ceph_mdsc_drop_dentry_lease(struct dentry *dentry)
3146{
3147 struct ceph_dentry_info *di = ceph_dentry(dentry);
3148
3149 ceph_put_mds_session(di->lease_session);
3150 di->lease_session = NULL;
3151}
3152
2600d2dd
SW		 3153static void handle_lease(struct ceph_mds_client *mdsc,
3154 struct ceph_mds_session *session,
3155 struct ceph_msg *msg)
2f2dc053 3156{
3d14c5d2 3157 struct super_block *sb = mdsc->fsc->sb;
2f2dc053 3158 struct inode *inode;
2f2dc053
SW		 3159 struct dentry *parent, *dentry;
3160 struct ceph_dentry_info *di;
2600d2dd 3161 int mds = session->s_mds;
2f2dc053 3162 struct ceph_mds_lease *h = msg->front.iov_base;
1e5ea23d 3163 u32 seq;
2f2dc053 3164 struct ceph_vino vino;
2f2dc053
SW		 3165 struct qstr dname;
3166 int release = 0;
3167
2f2dc053
SW		 3168 dout("handle_lease from mds%d\n", mds);
3169
3170 /* decode */
3171 if (msg->front.iov_len < sizeof(*h) + sizeof(u32))
3172 goto bad;
3173 vino.ino = le64_to_cpu(h->ino);
3174 vino.snap = CEPH_NOSNAP;
1e5ea23d 3175 seq = le32_to_cpu(h->seq);
2f2dc053
SW		 3176 dname.name = (void *)h + sizeof(*h) + sizeof(u32);
3177 dname.len = msg->front.iov_len - sizeof(*h) - sizeof(u32);
3178 if (dname.len != get_unaligned_le32(h+1))
3179 goto bad;
3180
2f2dc053
SW		 3181 /* lookup inode */
3182 inode = ceph_find_inode(sb, vino);
2f90b852
SW		 3183 dout("handle_lease %s, ino %llx %p %.*s\n",
3184 ceph_lease_op_name(h->action), vino.ino, inode,
1e5ea23d 3185 dname.len, dname.name);
6cd3bcad
YZ		 3186
3187 mutex_lock(&session->s_mutex);
3188 session->s_seq++;
3189
2f2dc053
SW		 3190 if (inode == NULL) {
3191 dout("handle_lease no inode %llx\n", vino.ino);
3192 goto release;
3193 }
2f2dc053
SW		 3194
3195 /* dentry */
3196 parent = d_find_alias(inode);
3197 if (!parent) {
3198 dout("no parent dentry on inode %p\n", inode);
3199 WARN_ON(1);
3200 goto release; /* hrm... */
3201 }
3202 dname.hash = full_name_hash(dname.name, dname.len);
3203 dentry = d_lookup(parent, &dname);
3204 dput(parent);
3205 if (!dentry)
3206 goto release;
3207
3208 spin_lock(&dentry->d_lock);
3209 di = ceph_dentry(dentry);
3210 switch (h->action) {
3211 case CEPH_MDS_LEASE_REVOKE:
3d8eb7a9 3212 if (di->lease_session == session) {
1e5ea23d
SW		 3213 if (ceph_seq_cmp(di->lease_seq, seq) > 0)
3214 h->seq = cpu_to_le32(di->lease_seq);
2f2dc053
SW		 3215 __ceph_mdsc_drop_dentry_lease(dentry);
3216 }
3217 release = 1;
3218 break;
3219
3220 case CEPH_MDS_LEASE_RENEW:
3d8eb7a9 3221 if (di->lease_session == session &&
2f2dc053
SW		 3222 di->lease_gen == session->s_cap_gen &&
3223 di->lease_renew_from &&
3224 di->lease_renew_after == 0) {
3225 unsigned long duration =
3563dbdd 3226 msecs_to_jiffies(le32_to_cpu(h->duration_ms));
2f2dc053 3227
1e5ea23d 3228 di->lease_seq = seq;
9b16f03c 3229 di->time = di->lease_renew_from + duration;
2f2dc053
SW		 3230 di->lease_renew_after = di->lease_renew_from +
3231 (duration >> 1);
3232 di->lease_renew_from = 0;
3233 }
3234 break;
3235 }
3236 spin_unlock(&dentry->d_lock);
3237 dput(dentry);
3238
3239 if (!release)
3240 goto out;
3241
3242release:
3243 /* let's just reuse the same message */
3244 h->action = CEPH_MDS_LEASE_REVOKE_ACK;
3245 ceph_msg_get(msg);
3246 ceph_con_send(&session->s_con, msg);
3247
3248out:
3249 iput(inode);
3250 mutex_unlock(&session->s_mutex);
2f2dc053
SW		 3251 return;
3252
3253bad:
3254 pr_err("corrupt lease message\n");
9ec7cab1 3255 ceph_msg_dump(msg);
2f2dc053
SW		 3256}
3257
3258void ceph_mdsc_lease_send_msg(struct ceph_mds_session *session,
3259 struct inode *inode,
3260 struct dentry *dentry, char action,
3261 u32 seq)
3262{
3263 struct ceph_msg *msg;
3264 struct ceph_mds_lease *lease;
3265 int len = sizeof(*lease) + sizeof(u32);
3266 int dnamelen = 0;
3267
3268 dout("lease_send_msg inode %p dentry %p %s to mds%d\n",
3269 inode, dentry, ceph_lease_op_name(action), session->s_mds);
3270 dnamelen = dentry->d_name.len;
3271 len += dnamelen;
3272
b61c2763 3273 msg = ceph_msg_new(CEPH_MSG_CLIENT_LEASE, len, GFP_NOFS, false);
a79832f2 3274 if (!msg)
2f2dc053
SW		 3275 return;
3276 lease = msg->front.iov_base;
3277 lease->action = action;
2f2dc053
SW		 3278 lease->ino = cpu_to_le64(ceph_vino(inode).ino);
3279 lease->first = lease->last = cpu_to_le64(ceph_vino(inode).snap);
3280 lease->seq = cpu_to_le32(seq);
3281 put_unaligned_le32(dnamelen, lease + 1);
3282 memcpy((void *)(lease + 1) + 4, dentry->d_name.name, dnamelen);
3283
3284 /*
3285 * if this is a preemptive lease RELEASE, no need to
3286 * flush request stream, since the actual request will
3287 * soon follow.
3288 */
3289 msg->more_to_follow = (action == CEPH_MDS_LEASE_RELEASE);
3290
3291 ceph_con_send(&session->s_con, msg);
3292}
3293
3294/*
3295 * Preemptively release a lease we expect to invalidate anyway.
3296 * Pass @inode always, @dentry is optional.
3297 */
3298void ceph_mdsc_lease_release(struct ceph_mds_client *mdsc, struct inode *inode,
2f90b852 3299 struct dentry *dentry)
2f2dc053
SW		 3300{
3301 struct ceph_dentry_info *di;
3302 struct ceph_mds_session *session;
3303 u32 seq;
3304
3305 BUG_ON(inode == NULL);
3306 BUG_ON(dentry == NULL);
2f2dc053
SW		 3307
3308 /* is dentry lease valid? */
3309 spin_lock(&dentry->d_lock);
3310 di = ceph_dentry(dentry);
3311 if (!di || !di->lease_session ||
3312 di->lease_session->s_mds < 0 ||
3313 di->lease_gen != di->lease_session->s_cap_gen ||
9b16f03c 3314 !time_before(jiffies, di->time)) {
2f2dc053 3315 dout("lease_release inode %p dentry %p -- "
2f90b852
SW		 3316 "no lease\n",
3317 inode, dentry);
2f2dc053
SW		 3318 spin_unlock(&dentry->d_lock);
3319 return;
3320 }
3321
3322 /* we do have a lease on this dentry; note mds and seq */
3323 session = ceph_get_mds_session(di->lease_session);
3324 seq = di->lease_seq;
3325 __ceph_mdsc_drop_dentry_lease(dentry);
3326 spin_unlock(&dentry->d_lock);
3327
2f90b852
SW		 3328 dout("lease_release inode %p dentry %p to mds%d\n",
3329 inode, dentry, session->s_mds);
2f2dc053
SW		 3330 ceph_mdsc_lease_send_msg(session, inode, dentry,
3331 CEPH_MDS_LEASE_RELEASE, seq);
3332 ceph_put_mds_session(session);
3333}
3334
3335/*
3336 * drop all leases (and dentry refs) in preparation for umount
3337 */
3338static void drop_leases(struct ceph_mds_client *mdsc)
3339{
3340 int i;
3341
3342 dout("drop_leases\n");
3343 mutex_lock(&mdsc->mutex);
3344 for (i = 0; i < mdsc->max_sessions; i++) {
3345 struct ceph_mds_session *s = __ceph_lookup_mds_session(mdsc, i);
3346 if (!s)
3347 continue;
3348 mutex_unlock(&mdsc->mutex);
3349 mutex_lock(&s->s_mutex);
3350 mutex_unlock(&s->s_mutex);
3351 ceph_put_mds_session(s);
3352 mutex_lock(&mdsc->mutex);
3353 }
3354 mutex_unlock(&mdsc->mutex);
3355}
3356
3357
3358
3359/*
3360 * delayed work -- periodically trim expired leases, renew caps with mds
3361 */
3362static void schedule_delayed(struct ceph_mds_client *mdsc)
3363{
3364 int delay = 5;
3365 unsigned hz = round_jiffies_relative(HZ * delay);
3366 schedule_delayed_work(&mdsc->delayed_work, hz);
3367}
3368
3369static void delayed_work(struct work_struct *work)
3370{
3371 int i;
3372 struct ceph_mds_client *mdsc =
3373 container_of(work, struct ceph_mds_client, delayed_work.work);
3374 int renew_interval;
3375 int renew_caps;
3376
3377 dout("mdsc delayed_work\n");
afcdaea3 3378 ceph_check_delayed_caps(mdsc);
2f2dc053
SW		 3379
3380 mutex_lock(&mdsc->mutex);
3381 renew_interval = mdsc->mdsmap->m_session_timeout >> 2;
3382 renew_caps = time_after_eq(jiffies, HZ*renew_interval +
3383 mdsc->last_renew_caps);
3384 if (renew_caps)
3385 mdsc->last_renew_caps = jiffies;
3386
3387 for (i = 0; i < mdsc->max_sessions; i++) {
3388 struct ceph_mds_session *s = __ceph_lookup_mds_session(mdsc, i);
3389 if (s == NULL)
3390 continue;
3391 if (s->s_state == CEPH_MDS_SESSION_CLOSING) {
3392 dout("resending session close request for mds%d\n",
3393 s->s_mds);
3394 request_close_session(mdsc, s);
3395 ceph_put_mds_session(s);
3396 continue;
3397 }
3398 if (s->s_ttl && time_after(jiffies, s->s_ttl)) {
3399 if (s->s_state == CEPH_MDS_SESSION_OPEN) {
3400 s->s_state = CEPH_MDS_SESSION_HUNG;
3401 pr_info("mds%d hung\n", s->s_mds);
3402 }
3403 }
3404 if (s->s_state < CEPH_MDS_SESSION_OPEN) {
3405 /* this mds is failed or recovering, just wait */
3406 ceph_put_mds_session(s);
3407 continue;
3408 }
3409 mutex_unlock(&mdsc->mutex);
3410
3411 mutex_lock(&s->s_mutex);
3412 if (renew_caps)
3413 send_renew_caps(mdsc, s);
3414 else
3415 ceph_con_keepalive(&s->s_con);
aab53dd9
SW		 3416 if (s->s_state == CEPH_MDS_SESSION_OPEN ||
3417 s->s_state == CEPH_MDS_SESSION_HUNG)
3d7ded4d 3418 ceph_send_cap_releases(mdsc, s);
2f2dc053
SW		 3419 mutex_unlock(&s->s_mutex);
3420 ceph_put_mds_session(s);
3421
3422 mutex_lock(&mdsc->mutex);
3423 }
3424 mutex_unlock(&mdsc->mutex);
3425
3426 schedule_delayed(mdsc);
3427}
3428
3d14c5d2 3429int ceph_mdsc_init(struct ceph_fs_client *fsc)
2f2dc053 3430
2f2dc053 3431{
3d14c5d2
YS		 3432 struct ceph_mds_client *mdsc;
3433
3434 mdsc = kzalloc(sizeof(struct ceph_mds_client), GFP_NOFS);
3435 if (!mdsc)
3436 return -ENOMEM;
3437 mdsc->fsc = fsc;
3438 fsc->mdsc = mdsc;
2f2dc053
SW		 3439 mutex_init(&mdsc->mutex);
3440 mdsc->mdsmap = kzalloc(sizeof(*mdsc->mdsmap), GFP_NOFS);
fb3101b6 3441 if (mdsc->mdsmap == NULL) {
3442 kfree(mdsc);
2d06eeb8 3443 return -ENOMEM;
fb3101b6 3444 }
2d06eeb8 3445
2f2dc053 3446 init_completion(&mdsc->safe_umount_waiters);
f3c60c59 3447 init_waitqueue_head(&mdsc->session_close_wq);
2f2dc053
SW		 3448 INIT_LIST_HEAD(&mdsc->waiting_for_map);
3449 mdsc->sessions = NULL;
86d8f67b 3450 atomic_set(&mdsc->num_sessions, 0);
2f2dc053
SW		 3451 mdsc->max_sessions = 0;
3452 mdsc->stopping = 0;
affbc19a 3453 mdsc->last_snap_seq = 0;
2f2dc053 3454 init_rwsem(&mdsc->snap_rwsem);
a105f00c 3455 mdsc->snap_realms = RB_ROOT;
2f2dc053
SW		 3456 INIT_LIST_HEAD(&mdsc->snap_empty);
3457 spin_lock_init(&mdsc->snap_empty_lock);
3458 mdsc->last_tid = 0;
e8a7b8b1 3459 mdsc->oldest_tid = 0;
44ca18f2 3460 mdsc->request_tree = RB_ROOT;
2f2dc053
SW		 3461 INIT_DELAYED_WORK(&mdsc->delayed_work, delayed_work);
3462 mdsc->last_renew_caps = jiffies;
3463 INIT_LIST_HEAD(&mdsc->cap_delay_list);
3464 spin_lock_init(&mdsc->cap_delay_lock);
3465 INIT_LIST_HEAD(&mdsc->snap_flush_list);
3466 spin_lock_init(&mdsc->snap_flush_lock);
553adfd9 3467 mdsc->last_cap_flush_tid = 1;
8310b089 3468 mdsc->cap_flush_tree = RB_ROOT;
2f2dc053 3469 INIT_LIST_HEAD(&mdsc->cap_dirty);
db354052 3470 INIT_LIST_HEAD(&mdsc->cap_dirty_migrating);
2f2dc053
SW		 3471 mdsc->num_cap_flushing = 0;
3472 spin_lock_init(&mdsc->cap_dirty_lock);
3473 init_waitqueue_head(&mdsc->cap_flushing_wq);
3474 spin_lock_init(&mdsc->dentry_lru_lock);
3475 INIT_LIST_HEAD(&mdsc->dentry_lru);
2d06eeb8 3476
37151668 3477 ceph_caps_init(mdsc);
3d14c5d2 3478 ceph_adjust_min_caps(mdsc, fsc->min_caps);
37151668 3479
10183a69
YZ		 3480 init_rwsem(&mdsc->pool_perm_rwsem);
3481 mdsc->pool_perm_tree = RB_ROOT;
3482
5f44f142 3483 return 0;
2f2dc053
SW		 3484}
3485
3486/*
3487 * Wait for safe replies on open mds requests. If we time out, drop
3488 * all requests from the tree to avoid dangling dentry refs.
3489 */
3490static void wait_requests(struct ceph_mds_client *mdsc)
3491{
a319bf56 3492 struct ceph_options *opts = mdsc->fsc->client->options;
2f2dc053 3493 struct ceph_mds_request *req;
2f2dc053
SW		 3494
3495 mutex_lock(&mdsc->mutex);
44ca18f2 3496 if (__get_oldest_req(mdsc)) {
2f2dc053 3497 mutex_unlock(&mdsc->mutex);
44ca18f2 3498
2f2dc053
SW		 3499 dout("wait_requests waiting for requests\n");
3500 wait_for_completion_timeout(&mdsc->safe_umount_waiters,
a319bf56 3501 ceph_timeout_jiffies(opts->mount_timeout));
2f2dc053
SW		 3502
3503 /* tear down remaining requests */
44ca18f2
SW		 3504 mutex_lock(&mdsc->mutex);
3505 while ((req = __get_oldest_req(mdsc))) {
2f2dc053
SW		 3506 dout("wait_requests timed out on tid %llu\n",
3507 req->r_tid);
44ca18f2 3508 __unregister_request(mdsc, req);
2f2dc053
SW		 3509 }
3510 }
3511 mutex_unlock(&mdsc->mutex);
3512 dout("wait_requests done\n");
3513}
3514
3515/*
3516 * called before mount is ro, and before dentries are torn down.
3517 * (hmm, does this still race with new lookups?)
3518 */
3519void ceph_mdsc_pre_umount(struct ceph_mds_client *mdsc)
3520{
3521 dout("pre_umount\n");
3522 mdsc->stopping = 1;
3523
3524 drop_leases(mdsc);
afcdaea3 3525 ceph_flush_dirty_caps(mdsc);
2f2dc053 3526 wait_requests(mdsc);
17c688c3
SW		 3527
3528 /*
3529 * wait for reply handlers to drop their request refs and
3530 * their inode/dcache refs
3531 */
3532 ceph_msgr_flush();
2f2dc053
SW		 3533}
3534
3535/*
3536 * wait for all write mds requests to flush.
3537 */
3538static void wait_unsafe_requests(struct ceph_mds_client *mdsc, u64 want_tid)
3539{
80fc7314 3540 struct ceph_mds_request *req = NULL, *nextreq;
44ca18f2 3541 struct rb_node *n;
2f2dc053
SW		 3542
3543 mutex_lock(&mdsc->mutex);
3544 dout("wait_unsafe_requests want %lld\n", want_tid);
80fc7314 3545restart:
44ca18f2
SW		 3546 req = __get_oldest_req(mdsc);
3547 while (req && req->r_tid <= want_tid) {
80fc7314
SW		 3548 /* find next request */
3549 n = rb_next(&req->r_node);
3550 if (n)
3551 nextreq = rb_entry(n, struct ceph_mds_request, r_node);
3552 else
3553 nextreq = NULL;
e8a7b8b1
YZ		 3554 if (req->r_op != CEPH_MDS_OP_SETFILELOCK &&
3555 (req->r_op & CEPH_MDS_OP_WRITE)) {
44ca18f2
SW		 3556 /* write op */
3557 ceph_mdsc_get_request(req);
80fc7314
SW		 3558 if (nextreq)
3559 ceph_mdsc_get_request(nextreq);
44ca18f2
SW		 3560 mutex_unlock(&mdsc->mutex);
3561 dout("wait_unsafe_requests wait on %llu (want %llu)\n",
3562 req->r_tid, want_tid);
3563 wait_for_completion(&req->r_safe_completion);
3564 mutex_lock(&mdsc->mutex);
44ca18f2 3565 ceph_mdsc_put_request(req);
80fc7314
SW		 3566 if (!nextreq)
3567 break; /* next dne before, so we're done! */
3568 if (RB_EMPTY_NODE(&nextreq->r_node)) {
3569 /* next request was removed from tree */
3570 ceph_mdsc_put_request(nextreq);
3571 goto restart;
3572 }
3573 ceph_mdsc_put_request(nextreq); /* won't go away */
44ca18f2 3574 }
80fc7314 3575 req = nextreq;
2f2dc053
SW		 3576 }
3577 mutex_unlock(&mdsc->mutex);
3578 dout("wait_unsafe_requests done\n");
3579}
3580
3581void ceph_mdsc_sync(struct ceph_mds_client *mdsc)
3582{
affbc19a 3583 u64 want_tid, want_flush, want_snap;
2f2dc053 3584
48fec5d0 3585 if (ACCESS_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_SHUTDOWN)
56b7cf95
SW		 3586 return;
3587
2f2dc053
SW		 3588 dout("sync\n");
3589 mutex_lock(&mdsc->mutex);
3590 want_tid = mdsc->last_tid;
2f2dc053 3591 mutex_unlock(&mdsc->mutex);
2f2dc053 3592
afcdaea3 3593 ceph_flush_dirty_caps(mdsc);
d3383a8e 3594 spin_lock(&mdsc->cap_dirty_lock);
8310b089 3595 want_flush = mdsc->last_cap_flush_tid;
d3383a8e
YZ		 3596 spin_unlock(&mdsc->cap_dirty_lock);
3597
affbc19a
YZ		 3598 down_read(&mdsc->snap_rwsem);
3599 want_snap = mdsc->last_snap_seq;
3600 up_read(&mdsc->snap_rwsem);
3601
3602 dout("sync want tid %lld flush_seq %lld snap_seq %lld\n",
3603 want_tid, want_flush, want_snap);
2f2dc053
SW		 3604
3605 wait_unsafe_requests(mdsc, want_tid);
affbc19a 3606 wait_caps_flush(mdsc, want_flush, want_snap);
2f2dc053
SW		 3607}
3608
f3c60c59
SW		 3609/*
3610 * true if all sessions are closed, or we force unmount
3611 */
7fd7d101 3612static bool done_closing_sessions(struct ceph_mds_client *mdsc)
f3c60c59 3613{
48fec5d0 3614 if (ACCESS_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_SHUTDOWN)
f3c60c59 3615 return true;
86d8f67b 3616 return atomic_read(&mdsc->num_sessions) == 0;
f3c60c59 3617}
2f2dc053
SW		 3618
3619/*
3620 * called after sb is ro.
3621 */
3622void ceph_mdsc_close_sessions(struct ceph_mds_client *mdsc)
3623{
a319bf56 3624 struct ceph_options *opts = mdsc->fsc->client->options;
2f2dc053
SW		 3625 struct ceph_mds_session *session;
3626 int i;
2f2dc053
SW		 3627
3628 dout("close_sessions\n");
3629
2f2dc053 3630 /* close sessions */
f3c60c59
SW		 3631 mutex_lock(&mdsc->mutex);
3632 for (i = 0; i < mdsc->max_sessions; i++) {
3633 session = __ceph_lookup_mds_session(mdsc, i);
3634 if (!session)
3635 continue;
2f2dc053 3636 mutex_unlock(&mdsc->mutex);
f3c60c59
SW		 3637 mutex_lock(&session->s_mutex);
3638 __close_session(mdsc, session);
3639 mutex_unlock(&session->s_mutex);
3640 ceph_put_mds_session(session);
2f2dc053
SW		 3641 mutex_lock(&mdsc->mutex);
3642 }
f3c60c59
SW		 3643 mutex_unlock(&mdsc->mutex);
3644
3645 dout("waiting for sessions to close\n");
3646 wait_event_timeout(mdsc->session_close_wq, done_closing_sessions(mdsc),
a319bf56 3647 ceph_timeout_jiffies(opts->mount_timeout));
2f2dc053
SW		 3648
3649 /* tear down remaining sessions */
f3c60c59 3650 mutex_lock(&mdsc->mutex);
2f2dc053
SW		 3651 for (i = 0; i < mdsc->max_sessions; i++) {
3652 if (mdsc->sessions[i]) {
3653 session = get_session(mdsc->sessions[i]);
2600d2dd 3654 __unregister_session(mdsc, session);
2f2dc053
SW		 3655 mutex_unlock(&mdsc->mutex);
3656 mutex_lock(&session->s_mutex);
3657 remove_session_caps(session);
3658 mutex_unlock(&session->s_mutex);
3659 ceph_put_mds_session(session);
3660 mutex_lock(&mdsc->mutex);
3661 }
3662 }
2f2dc053 3663 WARN_ON(!list_empty(&mdsc->cap_delay_list));
2f2dc053
SW		 3664 mutex_unlock(&mdsc->mutex);
3665
3666 ceph_cleanup_empty_realms(mdsc);
3667
3668 cancel_delayed_work_sync(&mdsc->delayed_work); /* cancel timer */
3669
3670 dout("stopped\n");
3671}
3672
48fec5d0
YZ		 3673void ceph_mdsc_force_umount(struct ceph_mds_client *mdsc)
3674{
3675 struct ceph_mds_session *session;
3676 int mds;
3677
3678 dout("force umount\n");
3679
3680 mutex_lock(&mdsc->mutex);
3681 for (mds = 0; mds < mdsc->max_sessions; mds++) {
3682 session = __ceph_lookup_mds_session(mdsc, mds);
3683 if (!session)
3684 continue;
3685 mutex_unlock(&mdsc->mutex);
3686 mutex_lock(&session->s_mutex);
3687 __close_session(mdsc, session);
3688 if (session->s_state == CEPH_MDS_SESSION_CLOSING) {
3689 cleanup_session_requests(mdsc, session);
3690 remove_session_caps(session);
3691 }
3692 mutex_unlock(&session->s_mutex);
3693 ceph_put_mds_session(session);
3694 mutex_lock(&mdsc->mutex);
3695 kick_requests(mdsc, mds);
3696 }
3697 __wake_requests(mdsc, &mdsc->waiting_for_map);
3698 mutex_unlock(&mdsc->mutex);
3699}
3700
3d14c5d2 3701static void ceph_mdsc_stop(struct ceph_mds_client *mdsc)
2f2dc053
SW		 3702{
3703 dout("stop\n");
3704 cancel_delayed_work_sync(&mdsc->delayed_work); /* cancel timer */
3705 if (mdsc->mdsmap)
3706 ceph_mdsmap_destroy(mdsc->mdsmap);
3707 kfree(mdsc->sessions);
37151668 3708 ceph_caps_finalize(mdsc);
10183a69 3709 ceph_pool_perm_destroy(mdsc);
2f2dc053
SW		 3710}
3711
3d14c5d2
YS		 3712void ceph_mdsc_destroy(struct ceph_fs_client *fsc)
3713{
3714 struct ceph_mds_client *mdsc = fsc->mdsc;
3715
ef550f6f 3716 dout("mdsc_destroy %p\n", mdsc);
3d14c5d2 3717 ceph_mdsc_stop(mdsc);
ef550f6f
SW		 3718
3719 /* flush out any connection work with references to us */
3720 ceph_msgr_flush();
3721
3d14c5d2
YS		 3722 fsc->mdsc = NULL;
3723 kfree(mdsc);
ef550f6f 3724 dout("mdsc_destroy %p done\n", mdsc);
3d14c5d2
YS		 3725}
3726
2f2dc053
SW		 3727
3728/*
3729 * handle mds map update.
3730 */
3731void ceph_mdsc_handle_map(struct ceph_mds_client *mdsc, struct ceph_msg *msg)
3732{
3733 u32 epoch;
3734 u32 maplen;
3735 void *p = msg->front.iov_base;
3736 void *end = p + msg->front.iov_len;
3737 struct ceph_mdsmap *newmap, *oldmap;
3738 struct ceph_fsid fsid;
3739 int err = -EINVAL;
3740
3741 ceph_decode_need(&p, end, sizeof(fsid)+2*sizeof(u32), bad);
3742 ceph_decode_copy(&p, &fsid, sizeof(fsid));
3d14c5d2 3743 if (ceph_check_fsid(mdsc->fsc->client, &fsid) < 0)
0743304d 3744 return;
c89136ea
SW		 3745 epoch = ceph_decode_32(&p);
3746 maplen = ceph_decode_32(&p);
2f2dc053
SW		 3747 dout("handle_map epoch %u len %d\n", epoch, (int)maplen);
3748
3749 /* do we need it? */
2f2dc053
SW		 3750 mutex_lock(&mdsc->mutex);
3751 if (mdsc->mdsmap && epoch <= mdsc->mdsmap->m_epoch) {
3752 dout("handle_map epoch %u <= our %u\n",
3753 epoch, mdsc->mdsmap->m_epoch);
3754 mutex_unlock(&mdsc->mutex);
3755 return;
3756 }
3757
3758 newmap = ceph_mdsmap_decode(&p, end);
3759 if (IS_ERR(newmap)) {
3760 err = PTR_ERR(newmap);
3761 goto bad_unlock;
3762 }
3763
3764 /* swap into place */
3765 if (mdsc->mdsmap) {
3766 oldmap = mdsc->mdsmap;
3767 mdsc->mdsmap = newmap;
3768 check_new_map(mdsc, newmap, oldmap);
3769 ceph_mdsmap_destroy(oldmap);
3770 } else {
3771 mdsc->mdsmap = newmap; /* first mds map */
3772 }
3d14c5d2 3773 mdsc->fsc->sb->s_maxbytes = mdsc->mdsmap->m_max_file_size;
2f2dc053
SW		 3774
3775 __wake_requests(mdsc, &mdsc->waiting_for_map);
82dcabad
ID		 3776 ceph_monc_got_map(&mdsc->fsc->client->monc, CEPH_SUB_MDSMAP,
3777 mdsc->mdsmap->m_epoch);
2f2dc053
SW		 3778
3779 mutex_unlock(&mdsc->mutex);
3780 schedule_delayed(mdsc);
3781 return;
3782
3783bad_unlock:
3784 mutex_unlock(&mdsc->mutex);
3785bad:
3786 pr_err("error decoding mdsmap %d\n", err);
3787 return;
3788}
3789
3790static struct ceph_connection *con_get(struct ceph_connection *con)
3791{
3792 struct ceph_mds_session *s = con->private;
3793
3794 if (get_session(s)) {
2600d2dd 3795 dout("mdsc con_get %p ok (%d)\n", s, atomic_read(&s->s_ref));
2f2dc053
SW		 3796 return con;
3797 }
3798 dout("mdsc con_get %p FAIL\n", s);
3799 return NULL;
3800}
3801
3802static void con_put(struct ceph_connection *con)
3803{
3804 struct ceph_mds_session *s = con->private;
3805
7d8e18a6 3806 dout("mdsc con_put %p (%d)\n", s, atomic_read(&s->s_ref) - 1);
2f2dc053
SW		 3807 ceph_put_mds_session(s);
3808}
3809
3810/*
3811 * if the client is unresponsive for long enough, the mds will kill
3812 * the session entirely.
3813 */
3814static void peer_reset(struct ceph_connection *con)
3815{
3816 struct ceph_mds_session *s = con->private;
7e70f0ed 3817 struct ceph_mds_client *mdsc = s->s_mdsc;
2f2dc053 3818
f3ae1b97 3819 pr_warn("mds%d closed our session\n", s->s_mds);
7e70f0ed 3820 send_mds_reconnect(mdsc, s);
2f2dc053
SW		 3821}
3822
3823static void dispatch(struct ceph_connection *con, struct ceph_msg *msg)
3824{
3825 struct ceph_mds_session *s = con->private;
3826 struct ceph_mds_client *mdsc = s->s_mdsc;
3827 int type = le16_to_cpu(msg->hdr.type);
3828
2600d2dd
SW		 3829 mutex_lock(&mdsc->mutex);
3830 if (__verify_registered_session(mdsc, s) < 0) {
3831 mutex_unlock(&mdsc->mutex);
3832 goto out;
3833 }
3834 mutex_unlock(&mdsc->mutex);
3835
2f2dc053
SW		 3836 switch (type) {
3837 case CEPH_MSG_MDS_MAP:
3838 ceph_mdsc_handle_map(mdsc, msg);
3839 break;
3840 case CEPH_MSG_CLIENT_SESSION:
3841 handle_session(s, msg);
3842 break;
3843 case CEPH_MSG_CLIENT_REPLY:
3844 handle_reply(s, msg);
3845 break;
3846 case CEPH_MSG_CLIENT_REQUEST_FORWARD:
2600d2dd 3847 handle_forward(mdsc, s, msg);
2f2dc053
SW		 3848 break;
3849 case CEPH_MSG_CLIENT_CAPS:
3850 ceph_handle_caps(s, msg);
3851 break;
3852 case CEPH_MSG_CLIENT_SNAP:
2600d2dd 3853 ceph_handle_snap(mdsc, s, msg);
2f2dc053
SW		 3854 break;
3855 case CEPH_MSG_CLIENT_LEASE:
2600d2dd 3856 handle_lease(mdsc, s, msg);
2f2dc053
SW		 3857 break;
3858
3859 default:
3860 pr_err("received unknown message type %d %s\n", type,
3861 ceph_msg_type_name(type));
3862 }
2600d2dd 3863out:
2f2dc053
SW		 3864 ceph_msg_put(msg);
3865}
3866
4e7a5dcd
SW		 3867/*
3868 * authentication
3869 */
a3530df3
AE		 3870
3871/*
3872 * Note: returned pointer is the address of a structure that's
3873 * managed separately. Caller must *not* attempt to free it.
3874 */
3875static struct ceph_auth_handshake *get_authorizer(struct ceph_connection *con,
8f43fb53 3876 int *proto, int force_new)
4e7a5dcd
SW		 3877{
3878 struct ceph_mds_session *s = con->private;
3879 struct ceph_mds_client *mdsc = s->s_mdsc;
3d14c5d2 3880 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
74f1869f 3881 struct ceph_auth_handshake *auth = &s->s_auth;
4e7a5dcd 3882
74f1869f 3883 if (force_new && auth->authorizer) {
6c1ea260 3884 ceph_auth_destroy_authorizer(auth->authorizer);
74f1869f 3885 auth->authorizer = NULL;
4e7a5dcd 3886 }
27859f97
SW		 3887 if (!auth->authorizer) {
3888 int ret = ceph_auth_create_authorizer(ac, CEPH_ENTITY_TYPE_MDS,
3889 auth);
0bed9b5c
SW		 3890 if (ret)
3891 return ERR_PTR(ret);
27859f97
SW		 3892 } else {
3893 int ret = ceph_auth_update_authorizer(ac, CEPH_ENTITY_TYPE_MDS,
3894 auth);
a255651d 3895 if (ret)
a3530df3 3896 return ERR_PTR(ret);
4e7a5dcd 3897 }
4e7a5dcd 3898 *proto = ac->protocol;
74f1869f 3899
a3530df3 3900 return auth;
4e7a5dcd
SW		 3901}
3902
3903
3904static int verify_authorizer_reply(struct ceph_connection *con, int len)
3905{
3906 struct ceph_mds_session *s = con->private;
3907 struct ceph_mds_client *mdsc = s->s_mdsc;
3d14c5d2 3908 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
4e7a5dcd 3909
27859f97 3910 return ceph_auth_verify_authorizer_reply(ac, s->s_auth.authorizer, len);
4e7a5dcd
SW		 3911}
3912
9bd2e6f8
SW		 3913static int invalidate_authorizer(struct ceph_connection *con)
3914{
3915 struct ceph_mds_session *s = con->private;
3916 struct ceph_mds_client *mdsc = s->s_mdsc;
3d14c5d2 3917 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
9bd2e6f8 3918
27859f97 3919 ceph_auth_invalidate_authorizer(ac, CEPH_ENTITY_TYPE_MDS);
9bd2e6f8 3920
3d14c5d2 3921 return ceph_monc_validate_auth(&mdsc->fsc->client->monc);
9bd2e6f8
SW		 3922}
3923
53ded495
AE		 3924static struct ceph_msg *mds_alloc_msg(struct ceph_connection *con,
3925 struct ceph_msg_header *hdr, int *skip)
3926{
3927 struct ceph_msg *msg;
3928 int type = (int) le16_to_cpu(hdr->type);
3929 int front_len = (int) le32_to_cpu(hdr->front_len);
3930
3931 if (con->in_msg)
3932 return con->in_msg;
3933
3934 *skip = 0;
3935 msg = ceph_msg_new(type, front_len, GFP_NOFS, false);
3936 if (!msg) {
3937 pr_err("unable to allocate msg type %d len %d\n",
3938 type, front_len);
3939 return NULL;
3940 }
53ded495
AE		 3941
3942 return msg;
3943}
3944
79dbd1ba 3945static int mds_sign_message(struct ceph_msg *msg)
33d07337 3946{
79dbd1ba 3947 struct ceph_mds_session *s = msg->con->private;
33d07337 3948 struct ceph_auth_handshake *auth = &s->s_auth;
79dbd1ba 3949
33d07337
YZ		 3950 return ceph_auth_sign_message(auth, msg);
3951}
3952
79dbd1ba 3953static int mds_check_message_signature(struct ceph_msg *msg)
33d07337 3954{
79dbd1ba 3955 struct ceph_mds_session *s = msg->con->private;
33d07337 3956 struct ceph_auth_handshake *auth = &s->s_auth;
79dbd1ba 3957
33d07337
YZ		 3958 return ceph_auth_check_message_signature(auth, msg);
3959}
3960
9e32789f 3961static const struct ceph_connection_operations mds_con_ops = {
2f2dc053
SW		 3962 .get = con_get,
3963 .put = con_put,
3964 .dispatch = dispatch,
4e7a5dcd
SW		 3965 .get_authorizer = get_authorizer,
3966 .verify_authorizer_reply = verify_authorizer_reply,
9bd2e6f8 3967 .invalidate_authorizer = invalidate_authorizer,
2f2dc053 3968 .peer_reset = peer_reset,
53ded495 3969 .alloc_msg = mds_alloc_msg,
79dbd1ba
ID		 3970 .sign_message = mds_sign_message,
3971 .check_message_signature = mds_check_message_signature,
2f2dc053
SW		 3972};
3973
2f2dc053 3974/* eof */
Linux 6.x block layer and io_uring tree(s)