projects / linux-2.6-block.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
ceph: don't show symlink target in debugfs/mdsc
[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45 * are no longer valid.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
5ea5c5e0
YZ		 103 if (features & CEPH_FEATURE_FS_FILE_LAYOUT_V2) {
104 ceph_decode_32_safe(p, end, info->pool_ns_len, bad);
105 ceph_decode_need(p, end, info->pool_ns_len, bad);
106 *p += info->pool_ns_len;
107 } else {
108 info->pool_ns_len = 0;
109 }
110
2f2dc053
SW		 111 return 0;
112bad:
113 return err;
114}
115
116/*
117 * parse a normal reply, which may contain a (dir+)dentry and/or a
118 * target inode.
119 */
120static int parse_reply_info_trace(void **p, void *end,
14303d20 121 struct ceph_mds_reply_info_parsed *info,
12b4629a 122 u64 features)
2f2dc053
SW		 123{
124 int err;
125
126 if (info->head->is_dentry) {
14303d20 127 err = parse_reply_info_in(p, end, &info->diri, features);
2f2dc053
SW		 128 if (err < 0)
129 goto out_bad;
130
131 if (unlikely(*p + sizeof(*info->dirfrag) > end))
132 goto bad;
133 info->dirfrag = *p;
134 *p += sizeof(*info->dirfrag) +
135 sizeof(u32)*le32_to_cpu(info->dirfrag->ndist);
136 if (unlikely(*p > end))
137 goto bad;
138
139 ceph_decode_32_safe(p, end, info->dname_len, bad);
140 ceph_decode_need(p, end, info->dname_len, bad);
141 info->dname = *p;
142 *p += info->dname_len;
143 info->dlease = *p;
144 *p += sizeof(*info->dlease);
145 }
146
147 if (info->head->is_target) {
14303d20 148 err = parse_reply_info_in(p, end, &info->targeti, features);
2f2dc053
SW		 149 if (err < 0)
150 goto out_bad;
151 }
152
153 if (unlikely(*p != end))
154 goto bad;
155 return 0;
156
157bad:
158 err = -EIO;
159out_bad:
160 pr_err("problem parsing mds trace %d\n", err);
161 return err;
162}
163
164/*
165 * parse readdir results
166 */
167static int parse_reply_info_dir(void **p, void *end,
14303d20 168 struct ceph_mds_reply_info_parsed *info,
12b4629a 169 u64 features)
2f2dc053
SW		 170{
171 u32 num, i = 0;
172 int err;
173
174 info->dir_dir = *p;
175 if (*p + sizeof(*info->dir_dir) > end)
176 goto bad;
177 *p += sizeof(*info->dir_dir) +
178 sizeof(u32)*le32_to_cpu(info->dir_dir->ndist);
179 if (*p > end)
180 goto bad;
181
182 ceph_decode_need(p, end, sizeof(num) + 2, bad);
c89136ea
SW		 183 num = ceph_decode_32(p);
184 info->dir_end = ceph_decode_8(p);
185 info->dir_complete = ceph_decode_8(p);
2f2dc053
SW		 186 if (num == 0)
187 goto done;
188
54008399 189 BUG_ON(!info->dir_in);
2f2dc053
SW		 190 info->dir_dname = (void *)(info->dir_in + num);
191 info->dir_dname_len = (void *)(info->dir_dname + num);
192 info->dir_dlease = (void *)(info->dir_dname_len + num);
54008399
YZ		 193 if ((unsigned long)(info->dir_dlease + num) >
194 (unsigned long)info->dir_in + info->dir_buf_size) {
195 pr_err("dir contents are larger than expected\n");
196 WARN_ON(1);
197 goto bad;
198 }
2f2dc053 199
54008399 200 info->dir_nr = num;
2f2dc053
SW		 201 while (num) {
202 /* dentry */
203 ceph_decode_need(p, end, sizeof(u32)*2, bad);
c89136ea 204 info->dir_dname_len[i] = ceph_decode_32(p);
2f2dc053
SW		 205 ceph_decode_need(p, end, info->dir_dname_len[i], bad);
206 info->dir_dname[i] = *p;
207 *p += info->dir_dname_len[i];
208 dout("parsed dir dname '%.*s'\n", info->dir_dname_len[i],
209 info->dir_dname[i]);
210 info->dir_dlease[i] = *p;
211 *p += sizeof(struct ceph_mds_reply_lease);
212
213 /* inode */
14303d20 214 err = parse_reply_info_in(p, end, &info->dir_in[i], features);
2f2dc053
SW		 215 if (err < 0)
216 goto out_bad;
217 i++;
218 num--;
219 }
220
221done:
222 if (*p != end)
223 goto bad;
224 return 0;
225
226bad:
227 err = -EIO;
228out_bad:
229 pr_err("problem parsing dir contents %d\n", err);
230 return err;
231}
232
25933abd
HS		 233/*
234 * parse fcntl F_GETLK results
235 */
236static int parse_reply_info_filelock(void **p, void *end,
14303d20 237 struct ceph_mds_reply_info_parsed *info,
12b4629a 238 u64 features)
25933abd
HS		 239{
240 if (*p + sizeof(*info->filelock_reply) > end)
241 goto bad;
242
243 info->filelock_reply = *p;
244 *p += sizeof(*info->filelock_reply);
245
246 if (unlikely(*p != end))
247 goto bad;
248 return 0;
249
250bad:
251 return -EIO;
252}
253
6e8575fa
SL		 254/*
255 * parse create results
256 */
257static int parse_reply_info_create(void **p, void *end,
258 struct ceph_mds_reply_info_parsed *info,
12b4629a 259 u64 features)
6e8575fa
SL		 260{
261 if (features & CEPH_FEATURE_REPLY_CREATE_INODE) {
262 if (*p == end) {
263 info->has_create_ino = false;
264 } else {
265 info->has_create_ino = true;
266 info->ino = ceph_decode_64(p);
267 }
268 }
269
270 if (unlikely(*p != end))
271 goto bad;
272 return 0;
273
274bad:
275 return -EIO;
276}
277
25933abd
HS		 278/*
279 * parse extra results
280 */
281static int parse_reply_info_extra(void **p, void *end,
14303d20 282 struct ceph_mds_reply_info_parsed *info,
12b4629a 283 u64 features)
25933abd
HS		 284{
285 if (info->head->op == CEPH_MDS_OP_GETFILELOCK)
14303d20 286 return parse_reply_info_filelock(p, end, info, features);
8a034497
YZ		 287 else if (info->head->op == CEPH_MDS_OP_READDIR ||
288 info->head->op == CEPH_MDS_OP_LSSNAP)
14303d20 289 return parse_reply_info_dir(p, end, info, features);
6e8575fa
SL		 290 else if (info->head->op == CEPH_MDS_OP_CREATE)
291 return parse_reply_info_create(p, end, info, features);
292 else
293 return -EIO;
25933abd
HS		 294}
295
2f2dc053
SW		 296/*
297 * parse entire mds reply
298 */
299static int parse_reply_info(struct ceph_msg *msg,
14303d20 300 struct ceph_mds_reply_info_parsed *info,
12b4629a 301 u64 features)
2f2dc053
SW		 302{
303 void *p, *end;
304 u32 len;
305 int err;
306
307 info->head = msg->front.iov_base;
308 p = msg->front.iov_base + sizeof(struct ceph_mds_reply_head);
309 end = p + msg->front.iov_len - sizeof(struct ceph_mds_reply_head);
310
311 /* trace */
312 ceph_decode_32_safe(&p, end, len, bad);
313 if (len > 0) {
32852a81 314 ceph_decode_need(&p, end, len, bad);
14303d20 315 err = parse_reply_info_trace(&p, p+len, info, features);
2f2dc053
SW		 316 if (err < 0)
317 goto out_bad;
318 }
319
25933abd 320 /* extra */
2f2dc053
SW		 321 ceph_decode_32_safe(&p, end, len, bad);
322 if (len > 0) {
32852a81 323 ceph_decode_need(&p, end, len, bad);
14303d20 324 err = parse_reply_info_extra(&p, p+len, info, features);
2f2dc053
SW		 325 if (err < 0)
326 goto out_bad;
327 }
328
329 /* snap blob */
330 ceph_decode_32_safe(&p, end, len, bad);
331 info->snapblob_len = len;
332 info->snapblob = p;
333 p += len;
334
335 if (p != end)
336 goto bad;
337 return 0;
338
339bad:
340 err = -EIO;
341out_bad:
342 pr_err("mds parse_reply err %d\n", err);
343 return err;
344}
345
346static void destroy_reply_info(struct ceph_mds_reply_info_parsed *info)
347{
54008399
YZ		 348 if (!info->dir_in)
349 return;
350 free_pages((unsigned long)info->dir_in, get_order(info->dir_buf_size));
2f2dc053
SW		 351}
352
353
354/*
355 * sessions
356 */
a687ecaf 357const char *ceph_session_state_name(int s)
2f2dc053
SW		 358{
359 switch (s) {
360 case CEPH_MDS_SESSION_NEW: return "new";
361 case CEPH_MDS_SESSION_OPENING: return "opening";
362 case CEPH_MDS_SESSION_OPEN: return "open";
363 case CEPH_MDS_SESSION_HUNG: return "hung";
364 case CEPH_MDS_SESSION_CLOSING: return "closing";
44ca18f2 365 case CEPH_MDS_SESSION_RESTARTING: return "restarting";
2f2dc053
SW		 366 case CEPH_MDS_SESSION_RECONNECTING: return "reconnecting";
367 default: return "???";
368 }
369}
370
371static struct ceph_mds_session *get_session(struct ceph_mds_session *s)
372{
373 if (atomic_inc_not_zero(&s->s_ref)) {
374 dout("mdsc get_session %p %d -> %d\n", s,
375 atomic_read(&s->s_ref)-1, atomic_read(&s->s_ref));
376 return s;
377 } else {
378 dout("mdsc get_session %p 0 -- FAIL", s);
379 return NULL;
380 }
381}
382
383void ceph_put_mds_session(struct ceph_mds_session *s)
384{
385 dout("mdsc put_session %p %d -> %d\n", s,
386 atomic_read(&s->s_ref), atomic_read(&s->s_ref)-1);
4e7a5dcd 387 if (atomic_dec_and_test(&s->s_ref)) {
6c4a1915 388 if (s->s_auth.authorizer)
6c1ea260 389 ceph_auth_destroy_authorizer(s->s_auth.authorizer);
2f2dc053 390 kfree(s);
4e7a5dcd 391 }
2f2dc053
SW		 392}
393
394/*
395 * called under mdsc->mutex
396 */
397struct ceph_mds_session *__ceph_lookup_mds_session(struct ceph_mds_client *mdsc,
398 int mds)
399{
400 struct ceph_mds_session *session;
401
402 if (mds >= mdsc->max_sessions || mdsc->sessions[mds] == NULL)
403 return NULL;
404 session = mdsc->sessions[mds];
405 dout("lookup_mds_session %p %d\n", session,
406 atomic_read(&session->s_ref));
407 get_session(session);
408 return session;
409}
410
411static bool __have_session(struct ceph_mds_client *mdsc, int mds)
412{
413 if (mds >= mdsc->max_sessions)
414 return false;
415 return mdsc->sessions[mds];
416}
417
2600d2dd
SW		 418static int __verify_registered_session(struct ceph_mds_client *mdsc,
419 struct ceph_mds_session *s)
420{
421 if (s->s_mds >= mdsc->max_sessions ||
422 mdsc->sessions[s->s_mds] != s)
423 return -ENOENT;
424 return 0;
425}
426
2f2dc053
SW		 427/*
428 * create+register a new session for given mds.
429 * called under mdsc->mutex.
430 */
431static struct ceph_mds_session *register_session(struct ceph_mds_client *mdsc,
432 int mds)
433{
434 struct ceph_mds_session *s;
435
c338c07c
NY		 436 if (mds >= mdsc->mdsmap->m_max_mds)
437 return ERR_PTR(-EINVAL);
438
2f2dc053 439 s = kzalloc(sizeof(*s), GFP_NOFS);
4736b009
DC		 440 if (!s)
441 return ERR_PTR(-ENOMEM);
2f2dc053
SW		 442 s->s_mdsc = mdsc;
443 s->s_mds = mds;
444 s->s_state = CEPH_MDS_SESSION_NEW;
445 s->s_ttl = 0;
446 s->s_seq = 0;
447 mutex_init(&s->s_mutex);
448
b7a9e5dd 449 ceph_con_init(&s->s_con, s, &mds_con_ops, &mdsc->fsc->client->msgr);
2f2dc053 450
d8fb02ab 451 spin_lock_init(&s->s_gen_ttl_lock);
2f2dc053 452 s->s_cap_gen = 0;
1ce208a6 453 s->s_cap_ttl = jiffies - 1;
d8fb02ab
AE		 454
455 spin_lock_init(&s->s_cap_lock);
2f2dc053
SW		 456 s->s_renew_requested = 0;
457 s->s_renew_seq = 0;
458 INIT_LIST_HEAD(&s->s_caps);
459 s->s_nr_caps = 0;
5dacf091 460 s->s_trim_caps = 0;
2f2dc053
SW		 461 atomic_set(&s->s_ref, 1);
462 INIT_LIST_HEAD(&s->s_waiting);
463 INIT_LIST_HEAD(&s->s_unsafe);
464 s->s_num_cap_releases = 0;
99a9c273 465 s->s_cap_reconnect = 0;
7c1332b8 466 s->s_cap_iterator = NULL;
2f2dc053 467 INIT_LIST_HEAD(&s->s_cap_releases);
2f2dc053
SW		 468 INIT_LIST_HEAD(&s->s_cap_flushing);
469 INIT_LIST_HEAD(&s->s_cap_snaps_flushing);
470
471 dout("register_session mds%d\n", mds);
472 if (mds >= mdsc->max_sessions) {
473 int newmax = 1 << get_count_order(mds+1);
474 struct ceph_mds_session **sa;
475
476 dout("register_session realloc to %d\n", newmax);
477 sa = kcalloc(newmax, sizeof(void *), GFP_NOFS);
478 if (sa == NULL)
42ce56e5 479 goto fail_realloc;
2f2dc053
SW		 480 if (mdsc->sessions) {
481 memcpy(sa, mdsc->sessions,
482 mdsc->max_sessions * sizeof(void *));
483 kfree(mdsc->sessions);
484 }
485 mdsc->sessions = sa;
486 mdsc->max_sessions = newmax;
487 }
488 mdsc->sessions[mds] = s;
86d8f67b 489 atomic_inc(&mdsc->num_sessions);
2f2dc053 490 atomic_inc(&s->s_ref); /* one ref to sessions[], one to caller */
42ce56e5 491
b7a9e5dd
SW		 492 ceph_con_open(&s->s_con, CEPH_ENTITY_TYPE_MDS, mds,
493 ceph_mdsmap_get_addr(mdsc->mdsmap, mds));
42ce56e5 494
2f2dc053 495 return s;
42ce56e5
SW		 496
497fail_realloc:
498 kfree(s);
499 return ERR_PTR(-ENOMEM);
2f2dc053
SW		 500}
501
502/*
503 * called under mdsc->mutex
504 */
2600d2dd 505static void __unregister_session(struct ceph_mds_client *mdsc,
42ce56e5 506 struct ceph_mds_session *s)
2f2dc053 507{
2600d2dd
SW		 508 dout("__unregister_session mds%d %p\n", s->s_mds, s);
509 BUG_ON(mdsc->sessions[s->s_mds] != s);
42ce56e5
SW		 510 mdsc->sessions[s->s_mds] = NULL;
511 ceph_con_close(&s->s_con);
512 ceph_put_mds_session(s);
86d8f67b 513 atomic_dec(&mdsc->num_sessions);
2f2dc053
SW		 514}
515
516/*
517 * drop session refs in request.
518 *
519 * should be last request ref, or hold mdsc->mutex
520 */
521static void put_request_session(struct ceph_mds_request *req)
522{
523 if (req->r_session) {
524 ceph_put_mds_session(req->r_session);
525 req->r_session = NULL;
526 }
527}
528
153c8e6b 529void ceph_mdsc_release_request(struct kref *kref)
2f2dc053 530{
153c8e6b
SW		 531 struct ceph_mds_request *req = container_of(kref,
532 struct ceph_mds_request,
533 r_kref);
54008399 534 destroy_reply_info(&req->r_reply_info);
153c8e6b
SW		 535 if (req->r_request)
536 ceph_msg_put(req->r_request);
54008399 537 if (req->r_reply)
153c8e6b 538 ceph_msg_put(req->r_reply);
153c8e6b 539 if (req->r_inode) {
41b02e1f 540 ceph_put_cap_refs(ceph_inode(req->r_inode), CEPH_CAP_PIN);
153c8e6b
SW		 541 iput(req->r_inode);
542 }
543 if (req->r_locked_dir)
41b02e1f 544 ceph_put_cap_refs(ceph_inode(req->r_locked_dir), CEPH_CAP_PIN);
e96a650a 545 iput(req->r_target_inode);
153c8e6b
SW		 546 if (req->r_dentry)
547 dput(req->r_dentry);
844d87c3
SW		 548 if (req->r_old_dentry)
549 dput(req->r_old_dentry);
550 if (req->r_old_dentry_dir) {
41b02e1f
SW		 551 /*
552 * track (and drop pins for) r_old_dentry_dir
553 * separately, since r_old_dentry's d_parent may have
554 * changed between the dir mutex being dropped and
555 * this request being freed.
556 */
557 ceph_put_cap_refs(ceph_inode(req->r_old_dentry_dir),
558 CEPH_CAP_PIN);
41b02e1f 559 iput(req->r_old_dentry_dir);
2f2dc053 560 }
153c8e6b
SW		 561 kfree(req->r_path1);
562 kfree(req->r_path2);
25e6bae3
YZ		 563 if (req->r_pagelist)
564 ceph_pagelist_release(req->r_pagelist);
153c8e6b 565 put_request_session(req);
37151668 566 ceph_unreserve_caps(req->r_mdsc, &req->r_caps_reservation);
153c8e6b 567 kfree(req);
2f2dc053
SW		 568}
569
fcd00b68
ID		 570DEFINE_RB_FUNCS(request, struct ceph_mds_request, r_tid, r_node)
571
2f2dc053
SW		 572/*
573 * lookup session, bump ref if found.
574 *
575 * called under mdsc->mutex.
576 */
fcd00b68
ID		 577static struct ceph_mds_request *
578lookup_get_request(struct ceph_mds_client *mdsc, u64 tid)
2f2dc053
SW		 579{
580 struct ceph_mds_request *req;
44ca18f2 581
fcd00b68
ID		 582 req = lookup_request(&mdsc->request_tree, tid);
583 if (req)
584 ceph_mdsc_get_request(req);
44ca18f2 585
fcd00b68 586 return req;
2f2dc053
SW		 587}
588
589/*
590 * Register an in-flight request, and assign a tid. Link to directory
591 * are modifying (if any).
592 *
593 * Called under mdsc->mutex.
594 */
595static void __register_request(struct ceph_mds_client *mdsc,
596 struct ceph_mds_request *req,
597 struct inode *dir)
598{
599 req->r_tid = ++mdsc->last_tid;
600 if (req->r_num_caps)
37151668
YS		 601 ceph_reserve_caps(mdsc, &req->r_caps_reservation,
602 req->r_num_caps);
2f2dc053
SW		 603 dout("__register_request %p tid %lld\n", req, req->r_tid);
604 ceph_mdsc_get_request(req);
fcd00b68 605 insert_request(&mdsc->request_tree, req);
2f2dc053 606
cb4276cc
SW		 607 req->r_uid = current_fsuid();
608 req->r_gid = current_fsgid();
609
e8a7b8b1
YZ		 610 if (mdsc->oldest_tid == 0 && req->r_op != CEPH_MDS_OP_SETFILELOCK)
611 mdsc->oldest_tid = req->r_tid;
612
2f2dc053 613 if (dir) {
3b663780 614 ihold(dir);
2f2dc053 615 req->r_unsafe_dir = dir;
2f2dc053
SW		 616 }
617}
618
619static void __unregister_request(struct ceph_mds_client *mdsc,
620 struct ceph_mds_request *req)
621{
622 dout("__unregister_request %p tid %lld\n", req, req->r_tid);
e8a7b8b1
YZ		 623
624 if (req->r_tid == mdsc->oldest_tid) {
625 struct rb_node *p = rb_next(&req->r_node);
626 mdsc->oldest_tid = 0;
627 while (p) {
628 struct ceph_mds_request *next_req =
629 rb_entry(p, struct ceph_mds_request, r_node);
630 if (next_req->r_op != CEPH_MDS_OP_SETFILELOCK) {
631 mdsc->oldest_tid = next_req->r_tid;
632 break;
633 }
634 p = rb_next(p);
635 }
636 }
637
fcd00b68 638 erase_request(&mdsc->request_tree, req);
2f2dc053 639
4c06ace8 640 if (req->r_unsafe_dir && req->r_got_unsafe) {
2f2dc053 641 struct ceph_inode_info *ci = ceph_inode(req->r_unsafe_dir);
2f2dc053
SW		 642 spin_lock(&ci->i_unsafe_lock);
643 list_del_init(&req->r_unsafe_dir_item);
644 spin_unlock(&ci->i_unsafe_lock);
4c06ace8 645 }
68cd5b4b
YZ		 646 if (req->r_target_inode && req->r_got_unsafe) {
647 struct ceph_inode_info *ci = ceph_inode(req->r_target_inode);
648 spin_lock(&ci->i_unsafe_lock);
649 list_del_init(&req->r_unsafe_target_item);
650 spin_unlock(&ci->i_unsafe_lock);
651 }
3b663780 652
4c06ace8 653 if (req->r_unsafe_dir) {
3b663780
SW		 654 iput(req->r_unsafe_dir);
655 req->r_unsafe_dir = NULL;
2f2dc053 656 }
94aa8ae1 657
fc55d2c9
YZ		 658 complete_all(&req->r_safe_completion);
659
94aa8ae1 660 ceph_mdsc_put_request(req);
2f2dc053
SW		 661}
662
663/*
664 * Choose mds to send request to next. If there is a hint set in the
665 * request (e.g., due to a prior forward hint from the mds), use that.
666 * Otherwise, consult frag tree and/or caps to identify the
667 * appropriate mds. If all else fails, choose randomly.
668 *
669 * Called under mdsc->mutex.
670 */
7fd7d101 671static struct dentry *get_nonsnap_parent(struct dentry *dentry)
eb6bb1c5 672{
d79698da
SW		 673 /*
674 * we don't need to worry about protecting the d_parent access
675 * here because we never renaming inside the snapped namespace
676 * except to resplice to another snapdir, and either the old or new
677 * result is a valid result.
678 */
2b0143b5 679 while (!IS_ROOT(dentry) && ceph_snap(d_inode(dentry)) != CEPH_NOSNAP)
eb6bb1c5
SW		 680 dentry = dentry->d_parent;
681 return dentry;
682}
683
2f2dc053
SW		 684static int __choose_mds(struct ceph_mds_client *mdsc,
685 struct ceph_mds_request *req)
686{
687 struct inode *inode;
688 struct ceph_inode_info *ci;
689 struct ceph_cap *cap;
690 int mode = req->r_direct_mode;
691 int mds = -1;
692 u32 hash = req->r_direct_hash;
693 bool is_hash = req->r_direct_is_hash;
694
695 /*
696 * is there a specific mds we should try? ignore hint if we have
697 * no session and the mds is not up (active or recovering).
698 */
699 if (req->r_resend_mds >= 0 &&
700 (__have_session(mdsc, req->r_resend_mds) ||
701 ceph_mdsmap_get_state(mdsc->mdsmap, req->r_resend_mds) > 0)) {
702 dout("choose_mds using resend_mds mds%d\n",
703 req->r_resend_mds);
704 return req->r_resend_mds;
705 }
706
707 if (mode == USE_RANDOM_MDS)
708 goto random;
709
710 inode = NULL;
711 if (req->r_inode) {
712 inode = req->r_inode;
713 } else if (req->r_dentry) {
d79698da
SW		 714 /* ignore race with rename; old or new d_parent is okay */
715 struct dentry *parent = req->r_dentry->d_parent;
2b0143b5 716 struct inode *dir = d_inode(parent);
eb6bb1c5 717
3d14c5d2 718 if (dir->i_sb != mdsc->fsc->sb) {
eb6bb1c5 719 /* not this fs! */
2b0143b5 720 inode = d_inode(req->r_dentry);
eb6bb1c5
SW		 721 } else if (ceph_snap(dir) != CEPH_NOSNAP) {
722 /* direct snapped/virtual snapdir requests
723 * based on parent dir inode */
d79698da 724 struct dentry *dn = get_nonsnap_parent(parent);
2b0143b5 725 inode = d_inode(dn);
eb6bb1c5 726 dout("__choose_mds using nonsnap parent %p\n", inode);
ca18bede 727 } else {
eb6bb1c5 728 /* dentry target */
2b0143b5 729 inode = d_inode(req->r_dentry);
ca18bede
YZ		 730 if (!inode || mode == USE_AUTH_MDS) {
731 /* dir + name */
732 inode = dir;
733 hash = ceph_dentry_hash(dir, req->r_dentry);
734 is_hash = true;
735 }
2f2dc053
SW		 736 }
737 }
eb6bb1c5 738
2f2dc053
SW		 739 dout("__choose_mds %p is_hash=%d (%d) mode %d\n", inode, (int)is_hash,
740 (int)hash, mode);
741 if (!inode)
742 goto random;
743 ci = ceph_inode(inode);
744
745 if (is_hash && S_ISDIR(inode->i_mode)) {
746 struct ceph_inode_frag frag;
747 int found;
748
749 ceph_choose_frag(ci, hash, &frag, &found);
750 if (found) {
751 if (mode == USE_ANY_MDS && frag.ndist > 0) {
752 u8 r;
753
754 /* choose a random replica */
755 get_random_bytes(&r, 1);
756 r %= frag.ndist;
757 mds = frag.dist[r];
758 dout("choose_mds %p %llx.%llx "
759 "frag %u mds%d (%d/%d)\n",
760 inode, ceph_vinop(inode),
d66bbd44 761 frag.frag, mds,
2f2dc053 762 (int)r, frag.ndist);
d66bbd44
SW		 763 if (ceph_mdsmap_get_state(mdsc->mdsmap, mds) >=
764 CEPH_MDS_STATE_ACTIVE)
765 return mds;
2f2dc053
SW		 766 }
767
768 /* since this file/dir wasn't known to be
769 * replicated, then we want to look for the
770 * authoritative mds. */
771 mode = USE_AUTH_MDS;
772 if (frag.mds >= 0) {
773 /* choose auth mds */
774 mds = frag.mds;
775 dout("choose_mds %p %llx.%llx "
776 "frag %u mds%d (auth)\n",
777 inode, ceph_vinop(inode), frag.frag, mds);
d66bbd44
SW		 778 if (ceph_mdsmap_get_state(mdsc->mdsmap, mds) >=
779 CEPH_MDS_STATE_ACTIVE)
780 return mds;
2f2dc053
SW		 781 }
782 }
783 }
784
be655596 785 spin_lock(&ci->i_ceph_lock);
2f2dc053
SW		 786 cap = NULL;
787 if (mode == USE_AUTH_MDS)
788 cap = ci->i_auth_cap;
789 if (!cap && !RB_EMPTY_ROOT(&ci->i_caps))
790 cap = rb_entry(rb_first(&ci->i_caps), struct ceph_cap, ci_node);
791 if (!cap) {
be655596 792 spin_unlock(&ci->i_ceph_lock);
2f2dc053
SW		 793 goto random;
794 }
795 mds = cap->session->s_mds;
796 dout("choose_mds %p %llx.%llx mds%d (%scap %p)\n",
797 inode, ceph_vinop(inode), mds,
798 cap == ci->i_auth_cap ? "auth " : "", cap);
be655596 799 spin_unlock(&ci->i_ceph_lock);
2f2dc053
SW		 800 return mds;
801
802random:
803 mds = ceph_mdsmap_get_random_mds(mdsc->mdsmap);
804 dout("choose_mds chose random mds%d\n", mds);
805 return mds;
806}
807
808
809/*
810 * session messages
811 */
812static struct ceph_msg *create_session_msg(u32 op, u64 seq)
813{
814 struct ceph_msg *msg;
815 struct ceph_mds_session_head *h;
816
b61c2763
SW		 817 msg = ceph_msg_new(CEPH_MSG_CLIENT_SESSION, sizeof(*h), GFP_NOFS,
818 false);
a79832f2 819 if (!msg) {
2f2dc053 820 pr_err("create_session_msg ENOMEM creating msg\n");
a79832f2 821 return NULL;
2f2dc053
SW		 822 }
823 h = msg->front.iov_base;
824 h->op = cpu_to_le32(op);
825 h->seq = cpu_to_le64(seq);
dbd0c8bf
JS		 826
827 return msg;
828}
829
830/*
831 * session message, specialization for CEPH_SESSION_REQUEST_OPEN
832 * to include additional client metadata fields.
833 */
834static struct ceph_msg *create_session_open_msg(struct ceph_mds_client *mdsc, u64 seq)
835{
836 struct ceph_msg *msg;
837 struct ceph_mds_session_head *h;
838 int i = -1;
839 int metadata_bytes = 0;
840 int metadata_key_count = 0;
841 struct ceph_options *opt = mdsc->fsc->client->options;
842 void *p;
843
a6a5ce4f 844 const char* metadata[][2] = {
dbd0c8bf 845 {"hostname", utsname()->nodename},
a6a5ce4f 846 {"kernel_version", utsname()->release},
dbd0c8bf
JS		 847 {"entity_id", opt->name ? opt->name : ""},
848 {NULL, NULL}
849 };
850
851 /* Calculate serialized length of metadata */
852 metadata_bytes = 4; /* map length */
853 for (i = 0; metadata[i][0] != NULL; ++i) {
854 metadata_bytes += 8 + strlen(metadata[i][0]) +
855 strlen(metadata[i][1]);
856 metadata_key_count++;
857 }
858
859 /* Allocate the message */
860 msg = ceph_msg_new(CEPH_MSG_CLIENT_SESSION, sizeof(*h) + metadata_bytes,
861 GFP_NOFS, false);
862 if (!msg) {
863 pr_err("create_session_msg ENOMEM creating msg\n");
864 return NULL;
865 }
866 h = msg->front.iov_base;
867 h->op = cpu_to_le32(CEPH_SESSION_REQUEST_OPEN);
868 h->seq = cpu_to_le64(seq);
869
870 /*
871 * Serialize client metadata into waiting buffer space, using
872 * the format that userspace expects for map<string, string>
7cfa0313
JS		 873 *
874 * ClientSession messages with metadata are v2
dbd0c8bf 875 */
7cfa0313
JS		 876 msg->hdr.version = cpu_to_le16(2);
877 msg->hdr.compat_version = cpu_to_le16(1);
dbd0c8bf
JS		 878
879 /* The write pointer, following the session_head structure */
880 p = msg->front.iov_base + sizeof(*h);
881
882 /* Number of entries in the map */
883 ceph_encode_32(&p, metadata_key_count);
884
885 /* Two length-prefixed strings for each entry in the map */
886 for (i = 0; metadata[i][0] != NULL; ++i) {
887 size_t const key_len = strlen(metadata[i][0]);
888 size_t const val_len = strlen(metadata[i][1]);
889
890 ceph_encode_32(&p, key_len);
891 memcpy(p, metadata[i][0], key_len);
892 p += key_len;
893 ceph_encode_32(&p, val_len);
894 memcpy(p, metadata[i][1], val_len);
895 p += val_len;
896 }
897
2f2dc053
SW		 898 return msg;
899}
900
901/*
902 * send session open request.
903 *
904 * called under mdsc->mutex
905 */
906static int __open_session(struct ceph_mds_client *mdsc,
907 struct ceph_mds_session *session)
908{
909 struct ceph_msg *msg;
910 int mstate;
911 int mds = session->s_mds;
2f2dc053
SW		 912
913 /* wait for mds to go active? */
914 mstate = ceph_mdsmap_get_state(mdsc->mdsmap, mds);
915 dout("open_session to mds%d (%s)\n", mds,
916 ceph_mds_state_name(mstate));
917 session->s_state = CEPH_MDS_SESSION_OPENING;
918 session->s_renew_requested = jiffies;
919
920 /* send connect message */
dbd0c8bf 921 msg = create_session_open_msg(mdsc, session->s_seq);
a79832f2
SW		 922 if (!msg)
923 return -ENOMEM;
2f2dc053 924 ceph_con_send(&session->s_con, msg);
2f2dc053
SW		 925 return 0;
926}
927
ed0552a1
SW		 928/*
929 * open sessions for any export targets for the given mds
930 *
931 * called under mdsc->mutex
932 */
5d72d13c
YZ		 933static struct ceph_mds_session *
934__open_export_target_session(struct ceph_mds_client *mdsc, int target)
935{
936 struct ceph_mds_session *session;
937
938 session = __ceph_lookup_mds_session(mdsc, target);
939 if (!session) {
940 session = register_session(mdsc, target);
941 if (IS_ERR(session))
942 return session;
943 }
944 if (session->s_state == CEPH_MDS_SESSION_NEW ||
945 session->s_state == CEPH_MDS_SESSION_CLOSING)
946 __open_session(mdsc, session);
947
948 return session;
949}
950
951struct ceph_mds_session *
952ceph_mdsc_open_export_target_session(struct ceph_mds_client *mdsc, int target)
953{
954 struct ceph_mds_session *session;
955
956 dout("open_export_target_session to mds%d\n", target);
957
958 mutex_lock(&mdsc->mutex);
959 session = __open_export_target_session(mdsc, target);
960 mutex_unlock(&mdsc->mutex);
961
962 return session;
963}
964
ed0552a1
SW		 965static void __open_export_target_sessions(struct ceph_mds_client *mdsc,
966 struct ceph_mds_session *session)
967{
968 struct ceph_mds_info *mi;
969 struct ceph_mds_session *ts;
970 int i, mds = session->s_mds;
ed0552a1
SW		 971
972 if (mds >= mdsc->mdsmap->m_max_mds)
973 return;
5d72d13c 974
ed0552a1
SW		 975 mi = &mdsc->mdsmap->m_info[mds];
976 dout("open_export_target_sessions for mds%d (%d targets)\n",
977 session->s_mds, mi->num_export_targets);
978
979 for (i = 0; i < mi->num_export_targets; i++) {
5d72d13c
YZ		 980 ts = __open_export_target_session(mdsc, mi->export_targets[i]);
981 if (!IS_ERR(ts))
982 ceph_put_mds_session(ts);
ed0552a1
SW		 983 }
984}
985
154f42c2
SW		 986void ceph_mdsc_open_export_target_sessions(struct ceph_mds_client *mdsc,
987 struct ceph_mds_session *session)
988{
989 mutex_lock(&mdsc->mutex);
990 __open_export_target_sessions(mdsc, session);
991 mutex_unlock(&mdsc->mutex);
992}
993
2f2dc053
SW		 994/*
995 * session caps
996 */
997
745a8e3b
YZ		 998/* caller holds s_cap_lock, we drop it */
999static void cleanup_cap_releases(struct ceph_mds_client *mdsc,
1000 struct ceph_mds_session *session)
1001 __releases(session->s_cap_lock)
2f2dc053 1002{
745a8e3b
YZ		 1003 LIST_HEAD(tmp_list);
1004 list_splice_init(&session->s_cap_releases, &tmp_list);
1005 session->s_num_cap_releases = 0;
1006 spin_unlock(&session->s_cap_lock);
2f2dc053 1007
745a8e3b
YZ		 1008 dout("cleanup_cap_releases mds%d\n", session->s_mds);
1009 while (!list_empty(&tmp_list)) {
1010 struct ceph_cap *cap;
1011 /* zero out the in-progress message */
1012 cap = list_first_entry(&tmp_list,
1013 struct ceph_cap, session_caps);
1014 list_del(&cap->session_caps);
1015 ceph_put_cap(mdsc, cap);
2f2dc053 1016 }
2f2dc053
SW		 1017}
1018
1c841a96
YZ		 1019static void cleanup_session_requests(struct ceph_mds_client *mdsc,
1020 struct ceph_mds_session *session)
1021{
1022 struct ceph_mds_request *req;
1023 struct rb_node *p;
1024
1025 dout("cleanup_session_requests mds%d\n", session->s_mds);
1026 mutex_lock(&mdsc->mutex);
1027 while (!list_empty(&session->s_unsafe)) {
1028 req = list_first_entry(&session->s_unsafe,
1029 struct ceph_mds_request, r_unsafe_item);
1030 list_del_init(&req->r_unsafe_item);
3e0708b9
YZ		 1031 pr_warn_ratelimited(" dropping unsafe request %llu\n",
1032 req->r_tid);
1c841a96
YZ		 1033 __unregister_request(mdsc, req);
1034 }
1035 /* zero r_attempts, so kick_requests() will re-send requests */
1036 p = rb_first(&mdsc->request_tree);
1037 while (p) {
1038 req = rb_entry(p, struct ceph_mds_request, r_node);
1039 p = rb_next(p);
1040 if (req->r_session &&
1041 req->r_session->s_mds == session->s_mds)
1042 req->r_attempts = 0;
1043 }
1044 mutex_unlock(&mdsc->mutex);
1045}
1046
2f2dc053 1047/*
f818a736
SW		 1048 * Helper to safely iterate over all caps associated with a session, with
1049 * special care taken to handle a racing __ceph_remove_cap().
2f2dc053 1050 *
f818a736 1051 * Caller must hold session s_mutex.
2f2dc053
SW		 1052 */
1053static int iterate_session_caps(struct ceph_mds_session *session,
1054 int (*cb)(struct inode *, struct ceph_cap *,
1055 void *), void *arg)
1056{
7c1332b8
SW		 1057 struct list_head *p;
1058 struct ceph_cap *cap;
1059 struct inode *inode, *last_inode = NULL;
1060 struct ceph_cap *old_cap = NULL;
2f2dc053
SW		 1061 int ret;
1062
1063 dout("iterate_session_caps %p mds%d\n", session, session->s_mds);
1064 spin_lock(&session->s_cap_lock);
7c1332b8
SW		 1065 p = session->s_caps.next;
1066 while (p != &session->s_caps) {
1067 cap = list_entry(p, struct ceph_cap, session_caps);
2f2dc053 1068 inode = igrab(&cap->ci->vfs_inode);
7c1332b8
SW		 1069 if (!inode) {
1070 p = p->next;
2f2dc053 1071 continue;
7c1332b8
SW		 1072 }
1073 session->s_cap_iterator = cap;
2f2dc053 1074 spin_unlock(&session->s_cap_lock);
7c1332b8
SW		 1075
1076 if (last_inode) {
1077 iput(last_inode);
1078 last_inode = NULL;
1079 }
1080 if (old_cap) {
37151668 1081 ceph_put_cap(session->s_mdsc, old_cap);
7c1332b8
SW		 1082 old_cap = NULL;
1083 }
1084
2f2dc053 1085 ret = cb(inode, cap, arg);
7c1332b8
SW		 1086 last_inode = inode;
1087
2f2dc053 1088 spin_lock(&session->s_cap_lock);
7c1332b8
SW		 1089 p = p->next;
1090 if (cap->ci == NULL) {
1091 dout("iterate_session_caps finishing cap %p removal\n",
1092 cap);
1093 BUG_ON(cap->session != session);
745a8e3b 1094 cap->session = NULL;
7c1332b8
SW		 1095 list_del_init(&cap->session_caps);
1096 session->s_nr_caps--;
745a8e3b
YZ		 1097 if (cap->queue_release) {
1098 list_add_tail(&cap->session_caps,
1099 &session->s_cap_releases);
1100 session->s_num_cap_releases++;
1101 } else {
1102 old_cap = cap; /* put_cap it w/o locks held */
1103 }
7c1332b8 1104 }
5dacf091
SW		 1105 if (ret < 0)
1106 goto out;
2f2dc053 1107 }
5dacf091
SW		 1108 ret = 0;
1109out:
7c1332b8 1110 session->s_cap_iterator = NULL;
2f2dc053 1111 spin_unlock(&session->s_cap_lock);
7c1332b8 1112
e96a650a 1113 iput(last_inode);
7c1332b8 1114 if (old_cap)
37151668 1115 ceph_put_cap(session->s_mdsc, old_cap);
7c1332b8 1116
5dacf091 1117 return ret;
2f2dc053
SW		 1118}
1119
1120static int remove_session_caps_cb(struct inode *inode, struct ceph_cap *cap,
6c99f254 1121 void *arg)
2f2dc053 1122{
6c93df5d 1123 struct ceph_fs_client *fsc = (struct ceph_fs_client *)arg;
2f2dc053 1124 struct ceph_inode_info *ci = ceph_inode(inode);
553adfd9 1125 LIST_HEAD(to_remove);
6c93df5d
YZ		 1126 bool drop = false;
1127 bool invalidate = false;
6c99f254 1128
2f2dc053
SW		 1129 dout("removing cap %p, ci is %p, inode is %p\n",
1130 cap, ci, &ci->vfs_inode);
be655596 1131 spin_lock(&ci->i_ceph_lock);
a096b09a 1132 __ceph_remove_cap(cap, false);
571ade33 1133 if (!ci->i_auth_cap) {
553adfd9 1134 struct ceph_cap_flush *cf;
6c93df5d 1135 struct ceph_mds_client *mdsc = fsc->mdsc;
6c99f254 1136
77310320
YZ		 1137 ci->i_ceph_flags |= CEPH_I_CAP_DROPPED;
1138
6c93df5d
YZ		 1139 if (ci->i_wrbuffer_ref > 0 &&
1140 ACCESS_ONCE(fsc->mount_state) == CEPH_MOUNT_SHUTDOWN)
1141 invalidate = true;
1142
553adfd9
YZ		 1143 while (true) {
1144 struct rb_node *n = rb_first(&ci->i_cap_flush_tree);
1145 if (!n)
1146 break;
1147 cf = rb_entry(n, struct ceph_cap_flush, i_node);
1148 rb_erase(&cf->i_node, &ci->i_cap_flush_tree);
1149 list_add(&cf->list, &to_remove);
1150 }
1151
6c99f254 1152 spin_lock(&mdsc->cap_dirty_lock);
8310b089
YZ		 1153
1154 list_for_each_entry(cf, &to_remove, list)
1155 rb_erase(&cf->g_node, &mdsc->cap_flush_tree);
1156
6c99f254 1157 if (!list_empty(&ci->i_dirty_item)) {
3e0708b9
YZ		 1158 pr_warn_ratelimited(
1159 " dropping dirty %s state for %p %lld\n",
6c99f254
SW		 1160 ceph_cap_string(ci->i_dirty_caps),
1161 inode, ceph_ino(inode));
1162 ci->i_dirty_caps = 0;
1163 list_del_init(&ci->i_dirty_item);
6c93df5d 1164 drop = true;
6c99f254
SW		 1165 }
1166 if (!list_empty(&ci->i_flushing_item)) {
3e0708b9
YZ		 1167 pr_warn_ratelimited(
1168 " dropping dirty+flushing %s state for %p %lld\n",
6c99f254
SW		 1169 ceph_cap_string(ci->i_flushing_caps),
1170 inode, ceph_ino(inode));
1171 ci->i_flushing_caps = 0;
1172 list_del_init(&ci->i_flushing_item);
1173 mdsc->num_cap_flushing--;
6c93df5d 1174 drop = true;
6c99f254 1175 }
6c99f254 1176 spin_unlock(&mdsc->cap_dirty_lock);
553adfd9 1177
f66fd9f0
YZ		 1178 if (!ci->i_dirty_caps && ci->i_prealloc_cap_flush) {
1179 list_add(&ci->i_prealloc_cap_flush->list, &to_remove);
1180 ci->i_prealloc_cap_flush = NULL;
1181 }
6c99f254 1182 }
be655596 1183 spin_unlock(&ci->i_ceph_lock);
553adfd9
YZ		 1184 while (!list_empty(&to_remove)) {
1185 struct ceph_cap_flush *cf;
1186 cf = list_first_entry(&to_remove,
1187 struct ceph_cap_flush, list);
1188 list_del(&cf->list);
f66fd9f0 1189 ceph_free_cap_flush(cf);
553adfd9 1190 }
77310320
YZ		 1191
1192 wake_up_all(&ci->i_cap_wq);
6c93df5d
YZ		 1193 if (invalidate)
1194 ceph_queue_invalidate(inode);
77310320 1195 if (drop)
6c99f254 1196 iput(inode);
2f2dc053
SW		 1197 return 0;
1198}
1199
1200/*
1201 * caller must hold session s_mutex
1202 */
1203static void remove_session_caps(struct ceph_mds_session *session)
1204{
6c93df5d
YZ		 1205 struct ceph_fs_client *fsc = session->s_mdsc->fsc;
1206 struct super_block *sb = fsc->sb;
2f2dc053 1207 dout("remove_session_caps on %p\n", session);
6c93df5d 1208 iterate_session_caps(session, remove_session_caps_cb, fsc);
6f60f889
YZ		 1209
1210 spin_lock(&session->s_cap_lock);
1211 if (session->s_nr_caps > 0) {
6f60f889
YZ		 1212 struct inode *inode;
1213 struct ceph_cap *cap, *prev = NULL;
1214 struct ceph_vino vino;
1215 /*
1216 * iterate_session_caps() skips inodes that are being
1217 * deleted, we need to wait until deletions are complete.
1218 * __wait_on_freeing_inode() is designed for the job,
1219 * but it is not exported, so use lookup inode function
1220 * to access it.
1221 */
1222 while (!list_empty(&session->s_caps)) {
1223 cap = list_entry(session->s_caps.next,
1224 struct ceph_cap, session_caps);
1225 if (cap == prev)
1226 break;
1227 prev = cap;
1228 vino = cap->ci->i_vino;
1229 spin_unlock(&session->s_cap_lock);
1230
ed284c49 1231 inode = ceph_find_inode(sb, vino);
6f60f889
YZ		 1232 iput(inode);
1233
1234 spin_lock(&session->s_cap_lock);
1235 }
1236 }
745a8e3b
YZ		 1237
1238 // drop cap expires and unlock s_cap_lock
1239 cleanup_cap_releases(session->s_mdsc, session);
6f60f889 1240
2f2dc053 1241 BUG_ON(session->s_nr_caps > 0);
6c99f254 1242 BUG_ON(!list_empty(&session->s_cap_flushing));
2f2dc053
SW		 1243}
1244
1245/*
1246 * wake up any threads waiting on this session's caps. if the cap is
1247 * old (didn't get renewed on the client reconnect), remove it now.
1248 *
1249 * caller must hold s_mutex.
1250 */
1251static int wake_up_session_cb(struct inode *inode, struct ceph_cap *cap,
1252 void *arg)
1253{
0dc2570f
SW		 1254 struct ceph_inode_info *ci = ceph_inode(inode);
1255
03066f23 1256 wake_up_all(&ci->i_cap_wq);
0dc2570f 1257 if (arg) {
be655596 1258 spin_lock(&ci->i_ceph_lock);
0dc2570f
SW		 1259 ci->i_wanted_max_size = 0;
1260 ci->i_requested_max_size = 0;
be655596 1261 spin_unlock(&ci->i_ceph_lock);
0dc2570f 1262 }
2f2dc053
SW		 1263 return 0;
1264}
1265
0dc2570f
SW		 1266static void wake_up_session_caps(struct ceph_mds_session *session,
1267 int reconnect)
2f2dc053
SW		 1268{
1269 dout("wake_up_session_caps %p mds%d\n", session, session->s_mds);
0dc2570f
SW		 1270 iterate_session_caps(session, wake_up_session_cb,
1271 (void *)(unsigned long)reconnect);
2f2dc053
SW		 1272}
1273
1274/*
1275 * Send periodic message to MDS renewing all currently held caps. The
1276 * ack will reset the expiration for all caps from this session.
1277 *
1278 * caller holds s_mutex
1279 */
1280static int send_renew_caps(struct ceph_mds_client *mdsc,
1281 struct ceph_mds_session *session)
1282{
1283 struct ceph_msg *msg;
1284 int state;
1285
1286 if (time_after_eq(jiffies, session->s_cap_ttl) &&
1287 time_after_eq(session->s_cap_ttl, session->s_renew_requested))
1288 pr_info("mds%d caps stale\n", session->s_mds);
e4cb4cb8 1289 session->s_renew_requested = jiffies;
2f2dc053
SW		 1290
1291 /* do not try to renew caps until a recovering mds has reconnected
1292 * with its clients. */
1293 state = ceph_mdsmap_get_state(mdsc->mdsmap, session->s_mds);
1294 if (state < CEPH_MDS_STATE_RECONNECT) {
1295 dout("send_renew_caps ignoring mds%d (%s)\n",
1296 session->s_mds, ceph_mds_state_name(state));
1297 return 0;
1298 }
1299
1300 dout("send_renew_caps to mds%d (%s)\n", session->s_mds,
1301 ceph_mds_state_name(state));
2f2dc053
SW		 1302 msg = create_session_msg(CEPH_SESSION_REQUEST_RENEWCAPS,
1303 ++session->s_renew_seq);
a79832f2
SW		 1304 if (!msg)
1305 return -ENOMEM;
2f2dc053
SW		 1306 ceph_con_send(&session->s_con, msg);
1307 return 0;
1308}
1309
186e4f7a
YZ		 1310static int send_flushmsg_ack(struct ceph_mds_client *mdsc,
1311 struct ceph_mds_session *session, u64 seq)
1312{
1313 struct ceph_msg *msg;
1314
1315 dout("send_flushmsg_ack to mds%d (%s)s seq %lld\n",
a687ecaf 1316 session->s_mds, ceph_session_state_name(session->s_state), seq);
186e4f7a
YZ		 1317 msg = create_session_msg(CEPH_SESSION_FLUSHMSG_ACK, seq);
1318 if (!msg)
1319 return -ENOMEM;
1320 ceph_con_send(&session->s_con, msg);
1321 return 0;
1322}
1323
1324
2f2dc053
SW		 1325/*
1326 * Note new cap ttl, and any transition from stale -> not stale (fresh?).
0dc2570f
SW		 1327 *
1328 * Called under session->s_mutex
2f2dc053
SW		 1329 */
1330static void renewed_caps(struct ceph_mds_client *mdsc,
1331 struct ceph_mds_session *session, int is_renew)
1332{
1333 int was_stale;
1334 int wake = 0;
1335
1336 spin_lock(&session->s_cap_lock);
1ce208a6 1337 was_stale = is_renew && time_after_eq(jiffies, session->s_cap_ttl);
2f2dc053
SW		 1338
1339 session->s_cap_ttl = session->s_renew_requested +
1340 mdsc->mdsmap->m_session_timeout*HZ;
1341
1342 if (was_stale) {
1343 if (time_before(jiffies, session->s_cap_ttl)) {
1344 pr_info("mds%d caps renewed\n", session->s_mds);
1345 wake = 1;
1346 } else {
1347 pr_info("mds%d caps still stale\n", session->s_mds);
1348 }
1349 }
1350 dout("renewed_caps mds%d ttl now %lu, was %s, now %s\n",
1351 session->s_mds, session->s_cap_ttl, was_stale ? "stale" : "fresh",
1352 time_before(jiffies, session->s_cap_ttl) ? "stale" : "fresh");
1353 spin_unlock(&session->s_cap_lock);
1354
1355 if (wake)
0dc2570f 1356 wake_up_session_caps(session, 0);
2f2dc053
SW		 1357}
1358
1359/*
1360 * send a session close request
1361 */
1362static int request_close_session(struct ceph_mds_client *mdsc,
1363 struct ceph_mds_session *session)
1364{
1365 struct ceph_msg *msg;
2f2dc053
SW		 1366
1367 dout("request_close_session mds%d state %s seq %lld\n",
a687ecaf 1368 session->s_mds, ceph_session_state_name(session->s_state),
2f2dc053
SW		 1369 session->s_seq);
1370 msg = create_session_msg(CEPH_SESSION_REQUEST_CLOSE, session->s_seq);
a79832f2
SW		 1371 if (!msg)
1372 return -ENOMEM;
1373 ceph_con_send(&session->s_con, msg);
1374 return 0;
2f2dc053
SW		 1375}
1376
1377/*
1378 * Called with s_mutex held.
1379 */
1380static int __close_session(struct ceph_mds_client *mdsc,
1381 struct ceph_mds_session *session)
1382{
1383 if (session->s_state >= CEPH_MDS_SESSION_CLOSING)
1384 return 0;
1385 session->s_state = CEPH_MDS_SESSION_CLOSING;
1386 return request_close_session(mdsc, session);
1387}
1388
1389/*
1390 * Trim old(er) caps.
1391 *
1392 * Because we can't cache an inode without one or more caps, we do
1393 * this indirectly: if a cap is unused, we prune its aliases, at which
1394 * point the inode will hopefully get dropped to.
1395 *
1396 * Yes, this is a bit sloppy. Our only real goal here is to respond to
1397 * memory pressure from the MDS, though, so it needn't be perfect.
1398 */
1399static int trim_caps_cb(struct inode *inode, struct ceph_cap *cap, void *arg)
1400{
1401 struct ceph_mds_session *session = arg;
1402 struct ceph_inode_info *ci = ceph_inode(inode);
979abfdd 1403 int used, wanted, oissued, mine;
2f2dc053
SW		 1404
1405 if (session->s_trim_caps <= 0)
1406 return -1;
1407
be655596 1408 spin_lock(&ci->i_ceph_lock);
2f2dc053
SW		 1409 mine = cap->issued | cap->implemented;
1410 used = __ceph_caps_used(ci);
979abfdd 1411 wanted = __ceph_caps_file_wanted(ci);
2f2dc053
SW		 1412 oissued = __ceph_caps_issued_other(ci, cap);
1413
979abfdd 1414 dout("trim_caps_cb %p cap %p mine %s oissued %s used %s wanted %s\n",
2f2dc053 1415 inode, cap, ceph_cap_string(mine), ceph_cap_string(oissued),
979abfdd
YZ		 1416 ceph_cap_string(used), ceph_cap_string(wanted));
1417 if (cap == ci->i_auth_cap) {
622f3e25
YZ		 1418 if (ci->i_dirty_caps || ci->i_flushing_caps ||
1419 !list_empty(&ci->i_cap_snaps))
979abfdd
YZ		 1420 goto out;
1421 if ((used | wanted) & CEPH_CAP_ANY_WR)
1422 goto out;
1423 }
5e804ac4
YZ		 1424 /* The inode has cached pages, but it's no longer used.
1425 * we can safely drop it */
1426 if (wanted == 0 && used == CEPH_CAP_FILE_CACHE &&
1427 !(oissued & CEPH_CAP_FILE_CACHE)) {
1428 used = 0;
1429 oissued = 0;
1430 }
979abfdd 1431 if ((used | wanted) & ~oissued & mine)
2f2dc053
SW		 1432 goto out; /* we need these caps */
1433
1434 session->s_trim_caps--;
1435 if (oissued) {
1436 /* we aren't the only cap.. just remove us */
a096b09a 1437 __ceph_remove_cap(cap, true);
2f2dc053 1438 } else {
5e804ac4 1439 /* try dropping referring dentries */
be655596 1440 spin_unlock(&ci->i_ceph_lock);
2f2dc053
SW		 1441 d_prune_aliases(inode);
1442 dout("trim_caps_cb %p cap %p pruned, count now %d\n",
1443 inode, cap, atomic_read(&inode->i_count));
1444 return 0;
1445 }
1446
1447out:
be655596 1448 spin_unlock(&ci->i_ceph_lock);
2f2dc053
SW		 1449 return 0;
1450}
1451
1452/*
1453 * Trim session cap count down to some max number.
1454 */
1455static int trim_caps(struct ceph_mds_client *mdsc,
1456 struct ceph_mds_session *session,
1457 int max_caps)
1458{
1459 int trim_caps = session->s_nr_caps - max_caps;
1460
1461 dout("trim_caps mds%d start: %d / %d, trim %d\n",
1462 session->s_mds, session->s_nr_caps, max_caps, trim_caps);
1463 if (trim_caps > 0) {
1464 session->s_trim_caps = trim_caps;
1465 iterate_session_caps(session, trim_caps_cb, session);
1466 dout("trim_caps mds%d done: %d / %d, trimmed %d\n",
1467 session->s_mds, session->s_nr_caps, max_caps,
1468 trim_caps - session->s_trim_caps);
5dacf091 1469 session->s_trim_caps = 0;
2f2dc053 1470 }
a56371d9 1471
a56371d9 1472 ceph_send_cap_releases(mdsc, session);
2f2dc053
SW		 1473 return 0;
1474}
1475
8310b089
YZ		 1476static int check_capsnap_flush(struct ceph_inode_info *ci,
1477 u64 want_snap_seq)
d3383a8e 1478{
8310b089 1479 int ret = 1;
d3383a8e 1480 spin_lock(&ci->i_ceph_lock);
affbc19a
YZ		 1481 if (want_snap_seq > 0 && !list_empty(&ci->i_cap_snaps)) {
1482 struct ceph_cap_snap *capsnap =
1483 list_first_entry(&ci->i_cap_snaps,
1484 struct ceph_cap_snap, ci_item);
8310b089 1485 ret = capsnap->follows >= want_snap_seq;
affbc19a 1486 }
d3383a8e 1487 spin_unlock(&ci->i_ceph_lock);
8310b089
YZ		 1488 return ret;
1489}
1490
1491static int check_caps_flush(struct ceph_mds_client *mdsc,
1492 u64 want_flush_tid)
1493{
1494 struct rb_node *n;
1495 struct ceph_cap_flush *cf;
1496 int ret = 1;
1497
1498 spin_lock(&mdsc->cap_dirty_lock);
1499 n = rb_first(&mdsc->cap_flush_tree);
1500 cf = n ? rb_entry(n, struct ceph_cap_flush, g_node) : NULL;
1501 if (cf && cf->tid <= want_flush_tid) {
1502 dout("check_caps_flush still flushing tid %llu <= %llu\n",
1503 cf->tid, want_flush_tid);
1504 ret = 0;
1505 }
1506 spin_unlock(&mdsc->cap_dirty_lock);
1507 return ret;
d3383a8e
YZ		 1508}
1509
2f2dc053
SW		 1510/*
1511 * flush all dirty inode data to disk.
1512 *
8310b089 1513 * returns true if we've flushed through want_flush_tid
2f2dc053 1514 */
affbc19a 1515static void wait_caps_flush(struct ceph_mds_client *mdsc,
8310b089 1516 u64 want_flush_tid, u64 want_snap_seq)
2f2dc053 1517{
d3383a8e 1518 int mds;
2f2dc053 1519
8310b089
YZ		 1520 dout("check_caps_flush want %llu snap want %llu\n",
1521 want_flush_tid, want_snap_seq);
2f2dc053 1522 mutex_lock(&mdsc->mutex);
affbc19a 1523 for (mds = 0; mds < mdsc->max_sessions; ) {
2f2dc053 1524 struct ceph_mds_session *session = mdsc->sessions[mds];
8310b089 1525 struct inode *inode = NULL;
2f2dc053 1526
affbc19a
YZ		 1527 if (!session) {
1528 mds++;
2f2dc053 1529 continue;
affbc19a 1530 }
2f2dc053
SW		 1531 get_session(session);
1532 mutex_unlock(&mdsc->mutex);
1533
1534 mutex_lock(&session->s_mutex);
affbc19a
YZ		 1535 if (!list_empty(&session->s_cap_snaps_flushing)) {
1536 struct ceph_cap_snap *capsnap =
1537 list_first_entry(&session->s_cap_snaps_flushing,
1538 struct ceph_cap_snap,
1539 flushing_item);
1540 struct ceph_inode_info *ci = capsnap->ci;
8310b089 1541 if (!check_capsnap_flush(ci, want_snap_seq)) {
affbc19a
YZ		 1542 dout("check_cap_flush still flushing snap %p "
1543 "follows %lld <= %lld to mds%d\n",
1544 &ci->vfs_inode, capsnap->follows,
1545 want_snap_seq, mds);
8310b089 1546 inode = igrab(&ci->vfs_inode);
2f2dc053 1547 }
2f2dc053
SW		 1548 }
1549 mutex_unlock(&session->s_mutex);
1550 ceph_put_mds_session(session);
1551
8310b089 1552 if (inode) {
affbc19a 1553 wait_event(mdsc->cap_flushing_wq,
8310b089
YZ		 1554 check_capsnap_flush(ceph_inode(inode),
1555 want_snap_seq));
1556 iput(inode);
1557 } else {
affbc19a 1558 mds++;
8310b089 1559 }
affbc19a 1560
2f2dc053
SW		 1561 mutex_lock(&mdsc->mutex);
1562 }
2f2dc053 1563 mutex_unlock(&mdsc->mutex);
8310b089
YZ		 1564
1565 wait_event(mdsc->cap_flushing_wq,
1566 check_caps_flush(mdsc, want_flush_tid));
1567
1568 dout("check_caps_flush ok, flushed thru %llu\n", want_flush_tid);
2f2dc053
SW		 1569}
1570
1571/*
1572 * called under s_mutex
1573 */
3d7ded4d
SW		 1574void ceph_send_cap_releases(struct ceph_mds_client *mdsc,
1575 struct ceph_mds_session *session)
2f2dc053 1576{
745a8e3b
YZ		 1577 struct ceph_msg *msg = NULL;
1578 struct ceph_mds_cap_release *head;
1579 struct ceph_mds_cap_item *item;
1580 struct ceph_cap *cap;
1581 LIST_HEAD(tmp_list);
1582 int num_cap_releases;
2f2dc053 1583
0f8605f2 1584 spin_lock(&session->s_cap_lock);
745a8e3b
YZ		 1585again:
1586 list_splice_init(&session->s_cap_releases, &tmp_list);
1587 num_cap_releases = session->s_num_cap_releases;
1588 session->s_num_cap_releases = 0;
2f2dc053 1589 spin_unlock(&session->s_cap_lock);
e01a5946 1590
745a8e3b
YZ		 1591 while (!list_empty(&tmp_list)) {
1592 if (!msg) {
1593 msg = ceph_msg_new(CEPH_MSG_CLIENT_CAPRELEASE,
09cbfeaf 1594 PAGE_SIZE, GFP_NOFS, false);
745a8e3b
YZ		 1595 if (!msg)
1596 goto out_err;
1597 head = msg->front.iov_base;
1598 head->num = cpu_to_le32(0);
1599 msg->front.iov_len = sizeof(*head);
1600 }
1601 cap = list_first_entry(&tmp_list, struct ceph_cap,
1602 session_caps);
1603 list_del(&cap->session_caps);
1604 num_cap_releases--;
e01a5946 1605
00bd8edb 1606 head = msg->front.iov_base;
745a8e3b
YZ		 1607 le32_add_cpu(&head->num, 1);
1608 item = msg->front.iov_base + msg->front.iov_len;
1609 item->ino = cpu_to_le64(cap->cap_ino);
1610 item->cap_id = cpu_to_le64(cap->cap_id);
1611 item->migrate_seq = cpu_to_le32(cap->mseq);
1612 item->seq = cpu_to_le32(cap->issue_seq);
1613 msg->front.iov_len += sizeof(*item);
1614
1615 ceph_put_cap(mdsc, cap);
1616
1617 if (le32_to_cpu(head->num) == CEPH_CAPS_PER_RELEASE) {
1618 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
1619 dout("send_cap_releases mds%d %p\n", session->s_mds, msg);
1620 ceph_con_send(&session->s_con, msg);
1621 msg = NULL;
1622 }
00bd8edb 1623 }
e01a5946 1624
745a8e3b 1625 BUG_ON(num_cap_releases != 0);
e01a5946 1626
745a8e3b
YZ		 1627 spin_lock(&session->s_cap_lock);
1628 if (!list_empty(&session->s_cap_releases))
1629 goto again;
1630 spin_unlock(&session->s_cap_lock);
1631
1632 if (msg) {
1633 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
1634 dout("send_cap_releases mds%d %p\n", session->s_mds, msg);
1635 ceph_con_send(&session->s_con, msg);
e01a5946 1636 }
745a8e3b
YZ		 1637 return;
1638out_err:
1639 pr_err("send_cap_releases mds%d, failed to allocate message\n",
1640 session->s_mds);
1641 spin_lock(&session->s_cap_lock);
1642 list_splice(&tmp_list, &session->s_cap_releases);
1643 session->s_num_cap_releases += num_cap_releases;
1644 spin_unlock(&session->s_cap_lock);
e01a5946
SW		 1645}
1646
2f2dc053
SW		 1647/*
1648 * requests
1649 */
1650
54008399
YZ		 1651int ceph_alloc_readdir_reply_buffer(struct ceph_mds_request *req,
1652 struct inode *dir)
1653{
1654 struct ceph_inode_info *ci = ceph_inode(dir);
1655 struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1656 struct ceph_mount_options *opt = req->r_mdsc->fsc->mount_options;
1657 size_t size = sizeof(*rinfo->dir_in) + sizeof(*rinfo->dir_dname_len) +
1658 sizeof(*rinfo->dir_dname) + sizeof(*rinfo->dir_dlease);
1659 int order, num_entries;
1660
1661 spin_lock(&ci->i_ceph_lock);
1662 num_entries = ci->i_files + ci->i_subdirs;
1663 spin_unlock(&ci->i_ceph_lock);
1664 num_entries = max(num_entries, 1);
1665 num_entries = min(num_entries, opt->max_readdir);
1666
1667 order = get_order(size * num_entries);
1668 while (order >= 0) {
687265e5
YZ		 1669 rinfo->dir_in = (void*)__get_free_pages(GFP_KERNEL |
1670 __GFP_NOWARN,
54008399
YZ		 1671 order);
1672 if (rinfo->dir_in)
1673 break;
1674 order--;
1675 }
1676 if (!rinfo->dir_in)
1677 return -ENOMEM;
1678
1679 num_entries = (PAGE_SIZE << order) / size;
1680 num_entries = min(num_entries, opt->max_readdir);
1681
1682 rinfo->dir_buf_size = PAGE_SIZE << order;
1683 req->r_num_caps = num_entries + 1;
1684 req->r_args.readdir.max_entries = cpu_to_le32(num_entries);
1685 req->r_args.readdir.max_bytes = cpu_to_le32(opt->max_readdir_bytes);
1686 return 0;
1687}
1688
2f2dc053
SW		 1689/*
1690 * Create an mds request.
1691 */
1692struct ceph_mds_request *
1693ceph_mdsc_create_request(struct ceph_mds_client *mdsc, int op, int mode)
1694{
1695 struct ceph_mds_request *req = kzalloc(sizeof(*req), GFP_NOFS);
1696
1697 if (!req)
1698 return ERR_PTR(-ENOMEM);
1699
b4556396 1700 mutex_init(&req->r_fill_mutex);
37151668 1701 req->r_mdsc = mdsc;
2f2dc053
SW		 1702 req->r_started = jiffies;
1703 req->r_resend_mds = -1;
1704 INIT_LIST_HEAD(&req->r_unsafe_dir_item);
68cd5b4b 1705 INIT_LIST_HEAD(&req->r_unsafe_target_item);
2f2dc053 1706 req->r_fmode = -1;
153c8e6b 1707 kref_init(&req->r_kref);
fcd00b68 1708 RB_CLEAR_NODE(&req->r_node);
2f2dc053
SW		 1709 INIT_LIST_HEAD(&req->r_wait);
1710 init_completion(&req->r_completion);
1711 init_completion(&req->r_safe_completion);
1712 INIT_LIST_HEAD(&req->r_unsafe_item);
1713
8bbd4714 1714 req->r_stamp = current_fs_time(mdsc->fsc->sb);
b8e69066 1715
2f2dc053
SW		 1716 req->r_op = op;
1717 req->r_direct_mode = mode;
1718 return req;
1719}
1720
1721/*
44ca18f2 1722 * return oldest (lowest) request, tid in request tree, 0 if none.
2f2dc053
SW		 1723 *
1724 * called under mdsc->mutex.
1725 */
44ca18f2
SW		 1726static struct ceph_mds_request *__get_oldest_req(struct ceph_mds_client *mdsc)
1727{
1728 if (RB_EMPTY_ROOT(&mdsc->request_tree))
1729 return NULL;
1730 return rb_entry(rb_first(&mdsc->request_tree),
1731 struct ceph_mds_request, r_node);
1732}
1733
e8a7b8b1 1734static inline u64 __get_oldest_tid(struct ceph_mds_client *mdsc)
2f2dc053 1735{
e8a7b8b1 1736 return mdsc->oldest_tid;
2f2dc053
SW		 1737}
1738
1739/*
1740 * Build a dentry's path. Allocate on heap; caller must kfree. Based
1741 * on build_path_from_dentry in fs/cifs/dir.c.
1742 *
1743 * If @stop_on_nosnap, generate path relative to the first non-snapped
1744 * inode.
1745 *
1746 * Encode hidden .snap dirs as a double /, i.e.
1747 * foo/.snap/bar -> foo//bar
1748 */
1749char *ceph_mdsc_build_path(struct dentry *dentry, int *plen, u64 *base,
1750 int stop_on_nosnap)
1751{
1752 struct dentry *temp;
1753 char *path;
1754 int len, pos;
1b71fe2e 1755 unsigned seq;
2f2dc053
SW		 1756
1757 if (dentry == NULL)
1758 return ERR_PTR(-EINVAL);
1759
1760retry:
1761 len = 0;
1b71fe2e
AV		 1762 seq = read_seqbegin(&rename_lock);
1763 rcu_read_lock();
2f2dc053 1764 for (temp = dentry; !IS_ROOT(temp);) {
2b0143b5 1765 struct inode *inode = d_inode(temp);
2f2dc053
SW		 1766 if (inode && ceph_snap(inode) == CEPH_SNAPDIR)
1767 len++; /* slash only */
1768 else if (stop_on_nosnap && inode &&
1769 ceph_snap(inode) == CEPH_NOSNAP)
1770 break;
1771 else
1772 len += 1 + temp->d_name.len;
1773 temp = temp->d_parent;
2f2dc053 1774 }
1b71fe2e 1775 rcu_read_unlock();
2f2dc053
SW		 1776 if (len)
1777 len--; /* no leading '/' */
1778
1779 path = kmalloc(len+1, GFP_NOFS);
1780 if (path == NULL)
1781 return ERR_PTR(-ENOMEM);
1782 pos = len;
1783 path[pos] = 0; /* trailing null */
1b71fe2e 1784 rcu_read_lock();
2f2dc053 1785 for (temp = dentry; !IS_ROOT(temp) && pos != 0; ) {
1b71fe2e 1786 struct inode *inode;
2f2dc053 1787
1b71fe2e 1788 spin_lock(&temp->d_lock);
2b0143b5 1789 inode = d_inode(temp);
2f2dc053 1790 if (inode && ceph_snap(inode) == CEPH_SNAPDIR) {
104648ad 1791 dout("build_path path+%d: %p SNAPDIR\n",
2f2dc053
SW		 1792 pos, temp);
1793 } else if (stop_on_nosnap && inode &&
1794 ceph_snap(inode) == CEPH_NOSNAP) {
9d5a09e6 1795 spin_unlock(&temp->d_lock);
2f2dc053
SW		 1796 break;
1797 } else {
1798 pos -= temp->d_name.len;
1b71fe2e
AV		 1799 if (pos < 0) {
1800 spin_unlock(&temp->d_lock);
2f2dc053 1801 break;
1b71fe2e 1802 }
2f2dc053
SW		 1803 strncpy(path + pos, temp->d_name.name,
1804 temp->d_name.len);
2f2dc053 1805 }
1b71fe2e 1806 spin_unlock(&temp->d_lock);
2f2dc053
SW		 1807 if (pos)
1808 path[--pos] = '/';
1809 temp = temp->d_parent;
2f2dc053 1810 }
1b71fe2e
AV		 1811 rcu_read_unlock();
1812 if (pos != 0 || read_seqretry(&rename_lock, seq)) {
104648ad 1813 pr_err("build_path did not end path lookup where "
2f2dc053
SW		 1814 "expected, namelen is %d, pos is %d\n", len, pos);
1815 /* presumably this is only possible if racing with a
1816 rename of one of the parent directories (we can not
1817 lock the dentries above us to prevent this, but
1818 retrying should be harmless) */
1819 kfree(path);
1820 goto retry;
1821 }
1822
2b0143b5 1823 *base = ceph_ino(d_inode(temp));
2f2dc053 1824 *plen = len;
104648ad 1825 dout("build_path on %p %d built %llx '%.*s'\n",
84d08fa8 1826 dentry, d_count(dentry), *base, len, path);
2f2dc053
SW		 1827 return path;
1828}
1829
1830static int build_dentry_path(struct dentry *dentry,
1831 const char **ppath, int *ppathlen, u64 *pino,
1832 int *pfreepath)
1833{
1834 char *path;
1835
2b0143b5
DH		 1836 if (ceph_snap(d_inode(dentry->d_parent)) == CEPH_NOSNAP) {
1837 *pino = ceph_ino(d_inode(dentry->d_parent));
2f2dc053
SW		 1838 *ppath = dentry->d_name.name;
1839 *ppathlen = dentry->d_name.len;
1840 return 0;
1841 }
1842 path = ceph_mdsc_build_path(dentry, ppathlen, pino, 1);
1843 if (IS_ERR(path))
1844 return PTR_ERR(path);
1845 *ppath = path;
1846 *pfreepath = 1;
1847 return 0;
1848}
1849
1850static int build_inode_path(struct inode *inode,
1851 const char **ppath, int *ppathlen, u64 *pino,
1852 int *pfreepath)
1853{
1854 struct dentry *dentry;
1855 char *path;
1856
1857 if (ceph_snap(inode) == CEPH_NOSNAP) {
1858 *pino = ceph_ino(inode);
1859 *ppathlen = 0;
1860 return 0;
1861 }
1862 dentry = d_find_alias(inode);
1863 path = ceph_mdsc_build_path(dentry, ppathlen, pino, 1);
1864 dput(dentry);
1865 if (IS_ERR(path))
1866 return PTR_ERR(path);
1867 *ppath = path;
1868 *pfreepath = 1;
1869 return 0;
1870}
1871
1872/*
1873 * request arguments may be specified via an inode *, a dentry *, or
1874 * an explicit ino+path.
1875 */
1876static int set_request_path_attr(struct inode *rinode, struct dentry *rdentry,
1877 const char *rpath, u64 rino,
1878 const char **ppath, int *pathlen,
1879 u64 *ino, int *freepath)
1880{
1881 int r = 0;
1882
1883 if (rinode) {
1884 r = build_inode_path(rinode, ppath, pathlen, ino, freepath);
1885 dout(" inode %p %llx.%llx\n", rinode, ceph_ino(rinode),
1886 ceph_snap(rinode));
1887 } else if (rdentry) {
1888 r = build_dentry_path(rdentry, ppath, pathlen, ino, freepath);
1889 dout(" dentry %p %llx/%.*s\n", rdentry, *ino, *pathlen,
1890 *ppath);
795858db 1891 } else if (rpath || rino) {
2f2dc053
SW		 1892 *ino = rino;
1893 *ppath = rpath;
b000056a 1894 *pathlen = rpath ? strlen(rpath) : 0;
2f2dc053
SW		 1895 dout(" path %.*s\n", *pathlen, rpath);
1896 }
1897
1898 return r;
1899}
1900
1901/*
1902 * called under mdsc->mutex
1903 */
1904static struct ceph_msg *create_request_message(struct ceph_mds_client *mdsc,
1905 struct ceph_mds_request *req,
6e6f0923 1906 int mds, bool drop_cap_releases)
2f2dc053
SW		 1907{
1908 struct ceph_msg *msg;
1909 struct ceph_mds_request_head *head;
1910 const char *path1 = NULL;
1911 const char *path2 = NULL;
1912 u64 ino1 = 0, ino2 = 0;
1913 int pathlen1 = 0, pathlen2 = 0;
1914 int freepath1 = 0, freepath2 = 0;
1915 int len;
1916 u16 releases;
1917 void *p, *end;
1918 int ret;
1919
1920 ret = set_request_path_attr(req->r_inode, req->r_dentry,
1921 req->r_path1, req->r_ino1.ino,
1922 &path1, &pathlen1, &ino1, &freepath1);
1923 if (ret < 0) {
1924 msg = ERR_PTR(ret);
1925 goto out;
1926 }
1927
1928 ret = set_request_path_attr(NULL, req->r_old_dentry,
1929 req->r_path2, req->r_ino2.ino,
1930 &path2, &pathlen2, &ino2, &freepath2);
1931 if (ret < 0) {
1932 msg = ERR_PTR(ret);
1933 goto out_free1;
1934 }
1935
1936 len = sizeof(*head) +
b8e69066 1937 pathlen1 + pathlen2 + 2*(1 + sizeof(u32) + sizeof(u64)) +
777d738a 1938 sizeof(struct ceph_timespec);
2f2dc053
SW		 1939
1940 /* calculate (max) length for cap releases */
1941 len += sizeof(struct ceph_mds_request_release) *
1942 (!!req->r_inode_drop + !!req->r_dentry_drop +
1943 !!req->r_old_inode_drop + !!req->r_old_dentry_drop);
1944 if (req->r_dentry_drop)
1945 len += req->r_dentry->d_name.len;
1946 if (req->r_old_dentry_drop)
1947 len += req->r_old_dentry->d_name.len;
1948
b61c2763 1949 msg = ceph_msg_new(CEPH_MSG_CLIENT_REQUEST, len, GFP_NOFS, false);
a79832f2
SW		 1950 if (!msg) {
1951 msg = ERR_PTR(-ENOMEM);
2f2dc053 1952 goto out_free2;
a79832f2 1953 }
2f2dc053 1954
7cfa0313 1955 msg->hdr.version = cpu_to_le16(2);
6df058c0
SW		 1956 msg->hdr.tid = cpu_to_le64(req->r_tid);
1957
2f2dc053
SW		 1958 head = msg->front.iov_base;
1959 p = msg->front.iov_base + sizeof(*head);
1960 end = msg->front.iov_base + msg->front.iov_len;
1961
1962 head->mdsmap_epoch = cpu_to_le32(mdsc->mdsmap->m_epoch);
1963 head->op = cpu_to_le32(req->r_op);
ff3d0046
EB		 1964 head->caller_uid = cpu_to_le32(from_kuid(&init_user_ns, req->r_uid));
1965 head->caller_gid = cpu_to_le32(from_kgid(&init_user_ns, req->r_gid));
2f2dc053
SW		 1966 head->args = req->r_args;
1967
1968 ceph_encode_filepath(&p, end, ino1, path1);
1969 ceph_encode_filepath(&p, end, ino2, path2);
1970
e979cf50
SW		 1971 /* make note of release offset, in case we need to replay */
1972 req->r_request_release_offset = p - msg->front.iov_base;
1973
2f2dc053
SW		 1974 /* cap releases */
1975 releases = 0;
1976 if (req->r_inode_drop)
1977 releases += ceph_encode_inode_release(&p,
2b0143b5 1978 req->r_inode ? req->r_inode : d_inode(req->r_dentry),
2f2dc053
SW		 1979 mds, req->r_inode_drop, req->r_inode_unless, 0);
1980 if (req->r_dentry_drop)
1981 releases += ceph_encode_dentry_release(&p, req->r_dentry,
1982 mds, req->r_dentry_drop, req->r_dentry_unless);
1983 if (req->r_old_dentry_drop)
1984 releases += ceph_encode_dentry_release(&p, req->r_old_dentry,
1985 mds, req->r_old_dentry_drop, req->r_old_dentry_unless);
1986 if (req->r_old_inode_drop)
1987 releases += ceph_encode_inode_release(&p,
2b0143b5 1988 d_inode(req->r_old_dentry),
2f2dc053 1989 mds, req->r_old_inode_drop, req->r_old_inode_unless, 0);
6e6f0923
YZ		 1990
1991 if (drop_cap_releases) {
1992 releases = 0;
1993 p = msg->front.iov_base + req->r_request_release_offset;
1994 }
1995
2f2dc053
SW		 1996 head->num_releases = cpu_to_le16(releases);
1997
b8e69066 1998 /* time stamp */
1f041a89
YZ		 1999 {
2000 struct ceph_timespec ts;
2001 ceph_encode_timespec(&ts, &req->r_stamp);
2002 ceph_encode_copy(&p, &ts, sizeof(ts));
2003 }
b8e69066 2004
2f2dc053
SW		 2005 BUG_ON(p > end);
2006 msg->front.iov_len = p - msg->front.iov_base;
2007 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
2008
25e6bae3
YZ		 2009 if (req->r_pagelist) {
2010 struct ceph_pagelist *pagelist = req->r_pagelist;
2011 atomic_inc(&pagelist->refcnt);
2012 ceph_msg_data_add_pagelist(msg, pagelist);
2013 msg->hdr.data_len = cpu_to_le32(pagelist->length);
2014 } else {
2015 msg->hdr.data_len = 0;
ebf18f47 2016 }
02afca6c 2017
2f2dc053
SW		 2018 msg->hdr.data_off = cpu_to_le16(0);
2019
2020out_free2:
2021 if (freepath2)
2022 kfree((char *)path2);
2023out_free1:
2024 if (freepath1)
2025 kfree((char *)path1);
2026out:
2027 return msg;
2028}
2029
2030/*
2031 * called under mdsc->mutex if error, under no mutex if
2032 * success.
2033 */
2034static void complete_request(struct ceph_mds_client *mdsc,
2035 struct ceph_mds_request *req)
2036{
2037 if (req->r_callback)
2038 req->r_callback(mdsc, req);
2039 else
03066f23 2040 complete_all(&req->r_completion);
2f2dc053
SW		 2041}
2042
2043/*
2044 * called under mdsc->mutex
2045 */
2046static int __prepare_send_request(struct ceph_mds_client *mdsc,
2047 struct ceph_mds_request *req,
6e6f0923 2048 int mds, bool drop_cap_releases)
2f2dc053
SW		 2049{
2050 struct ceph_mds_request_head *rhead;
2051 struct ceph_msg *msg;
2052 int flags = 0;
2053
2f2dc053 2054 req->r_attempts++;
e55b71f8
GF		 2055 if (req->r_inode) {
2056 struct ceph_cap *cap =
2057 ceph_get_cap_for_mds(ceph_inode(req->r_inode), mds);
2058
2059 if (cap)
2060 req->r_sent_on_mseq = cap->mseq;
2061 else
2062 req->r_sent_on_mseq = -1;
2063 }
2f2dc053
SW		 2064 dout("prepare_send_request %p tid %lld %s (attempt %d)\n", req,
2065 req->r_tid, ceph_mds_op_name(req->r_op), req->r_attempts);
2066
01a92f17 2067 if (req->r_got_unsafe) {
c5c9a0bf 2068 void *p;
01a92f17
SW		 2069 /*
2070 * Replay. Do not regenerate message (and rebuild
2071 * paths, etc.); just use the original message.
2072 * Rebuilding paths will break for renames because
2073 * d_move mangles the src name.
2074 */
2075 msg = req->r_request;
2076 rhead = msg->front.iov_base;
2077
2078 flags = le32_to_cpu(rhead->flags);
2079 flags |= CEPH_MDS_FLAG_REPLAY;
2080 rhead->flags = cpu_to_le32(flags);
2081
2082 if (req->r_target_inode)
2083 rhead->ino = cpu_to_le64(ceph_ino(req->r_target_inode));
2084
2085 rhead->num_retry = req->r_attempts - 1;
e979cf50
SW		 2086
2087 /* remove cap/dentry releases from message */
2088 rhead->num_releases = 0;
c5c9a0bf
YZ		 2089
2090 /* time stamp */
2091 p = msg->front.iov_base + req->r_request_release_offset;
1f041a89
YZ		 2092 {
2093 struct ceph_timespec ts;
2094 ceph_encode_timespec(&ts, &req->r_stamp);
2095 ceph_encode_copy(&p, &ts, sizeof(ts));
2096 }
c5c9a0bf
YZ		 2097
2098 msg->front.iov_len = p - msg->front.iov_base;
2099 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
01a92f17
SW		 2100 return 0;
2101 }
2102
2f2dc053
SW		 2103 if (req->r_request) {
2104 ceph_msg_put(req->r_request);
2105 req->r_request = NULL;
2106 }
6e6f0923 2107 msg = create_request_message(mdsc, req, mds, drop_cap_releases);
2f2dc053 2108 if (IS_ERR(msg)) {
e1518c7c 2109 req->r_err = PTR_ERR(msg);
a79832f2 2110 return PTR_ERR(msg);
2f2dc053
SW		 2111 }
2112 req->r_request = msg;
2113
2114 rhead = msg->front.iov_base;
2f2dc053
SW		 2115 rhead->oldest_client_tid = cpu_to_le64(__get_oldest_tid(mdsc));
2116 if (req->r_got_unsafe)
2117 flags |= CEPH_MDS_FLAG_REPLAY;
2118 if (req->r_locked_dir)
2119 flags |= CEPH_MDS_FLAG_WANT_DENTRY;
2120 rhead->flags = cpu_to_le32(flags);
2121 rhead->num_fwd = req->r_num_fwd;
2122 rhead->num_retry = req->r_attempts - 1;
01a92f17 2123 rhead->ino = 0;
2f2dc053
SW		 2124
2125 dout(" r_locked_dir = %p\n", req->r_locked_dir);
2f2dc053
SW		 2126 return 0;
2127}
2128
2129/*
2130 * send request, or put it on the appropriate wait list.
2131 */
2132static int __do_request(struct ceph_mds_client *mdsc,
2133 struct ceph_mds_request *req)
2134{
2135 struct ceph_mds_session *session = NULL;
2136 int mds = -1;
48fec5d0 2137 int err = 0;
2f2dc053 2138
eb1b8af3
YZ		 2139 if (req->r_err || req->r_got_result) {
2140 if (req->r_aborted)
2141 __unregister_request(mdsc, req);
2f2dc053 2142 goto out;
eb1b8af3 2143 }
2f2dc053
SW		 2144
2145 if (req->r_timeout &&
2146 time_after_eq(jiffies, req->r_started + req->r_timeout)) {
2147 dout("do_request timed out\n");
2148 err = -EIO;
2149 goto finish;
2150 }
48fec5d0
YZ		 2151 if (ACCESS_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_SHUTDOWN) {
2152 dout("do_request forced umount\n");
2153 err = -EIO;
2154 goto finish;
2155 }
2f2dc053 2156
dc69e2e9
SW		 2157 put_request_session(req);
2158
2f2dc053
SW		 2159 mds = __choose_mds(mdsc, req);
2160 if (mds < 0 ||
2161 ceph_mdsmap_get_state(mdsc->mdsmap, mds) < CEPH_MDS_STATE_ACTIVE) {
2162 dout("do_request no mds or not active, waiting for map\n");
2163 list_add(&req->r_wait, &mdsc->waiting_for_map);
2164 goto out;
2165 }
2166
2167 /* get, open session */
2168 session = __ceph_lookup_mds_session(mdsc, mds);
9c423956 2169 if (!session) {
2f2dc053 2170 session = register_session(mdsc, mds);
9c423956
SW		 2171 if (IS_ERR(session)) {
2172 err = PTR_ERR(session);
2173 goto finish;
2174 }
2175 }
dc69e2e9
SW		 2176 req->r_session = get_session(session);
2177
2f2dc053 2178 dout("do_request mds%d session %p state %s\n", mds, session,
a687ecaf 2179 ceph_session_state_name(session->s_state));
2f2dc053
SW		 2180 if (session->s_state != CEPH_MDS_SESSION_OPEN &&
2181 session->s_state != CEPH_MDS_SESSION_HUNG) {
2182 if (session->s_state == CEPH_MDS_SESSION_NEW ||
2183 session->s_state == CEPH_MDS_SESSION_CLOSING)
2184 __open_session(mdsc, session);
2185 list_add(&req->r_wait, &session->s_waiting);
2186 goto out_session;
2187 }
2188
2189 /* send request */
2f2dc053
SW		 2190 req->r_resend_mds = -1; /* forget any previous mds hint */
2191
2192 if (req->r_request_started == 0) /* note request start time */
2193 req->r_request_started = jiffies;
2194
6e6f0923 2195 err = __prepare_send_request(mdsc, req, mds, false);
2f2dc053
SW		 2196 if (!err) {
2197 ceph_msg_get(req->r_request);
2198 ceph_con_send(&session->s_con, req->r_request);
2199 }
2200
2201out_session:
2202 ceph_put_mds_session(session);
48fec5d0
YZ		 2203finish:
2204 if (err) {
2205 dout("__do_request early error %d\n", err);
2206 req->r_err = err;
2207 complete_request(mdsc, req);
2208 __unregister_request(mdsc, req);
2209 }
2f2dc053
SW		 2210out:
2211 return err;
2f2dc053
SW		 2212}
2213
2214/*
2215 * called under mdsc->mutex
2216 */
2217static void __wake_requests(struct ceph_mds_client *mdsc,
2218 struct list_head *head)
2219{
ed75ec2c
YZ		 2220 struct ceph_mds_request *req;
2221 LIST_HEAD(tmp_list);
2222
2223 list_splice_init(head, &tmp_list);
2f2dc053 2224
ed75ec2c
YZ		 2225 while (!list_empty(&tmp_list)) {
2226 req = list_entry(tmp_list.next,
2227 struct ceph_mds_request, r_wait);
2f2dc053 2228 list_del_init(&req->r_wait);
7971bd92 2229 dout(" wake request %p tid %llu\n", req, req->r_tid);
2f2dc053
SW		 2230 __do_request(mdsc, req);
2231 }
2232}
2233
2234/*
2235 * Wake up threads with requests pending for @mds, so that they can
29790f26 2236 * resubmit their requests to a possibly different mds.
2f2dc053 2237 */
29790f26 2238static void kick_requests(struct ceph_mds_client *mdsc, int mds)
2f2dc053 2239{
44ca18f2 2240 struct ceph_mds_request *req;
282c1052 2241 struct rb_node *p = rb_first(&mdsc->request_tree);
2f2dc053
SW		 2242
2243 dout("kick_requests mds%d\n", mds);
282c1052 2244 while (p) {
44ca18f2 2245 req = rb_entry(p, struct ceph_mds_request, r_node);
282c1052 2246 p = rb_next(p);
44ca18f2
SW		 2247 if (req->r_got_unsafe)
2248 continue;
3de22be6
YZ		 2249 if (req->r_attempts > 0)
2250 continue; /* only new requests */
44ca18f2
SW		 2251 if (req->r_session &&
2252 req->r_session->s_mds == mds) {
2253 dout(" kicking tid %llu\n", req->r_tid);
03974e81 2254 list_del_init(&req->r_wait);
44ca18f2 2255 __do_request(mdsc, req);
2f2dc053
SW		 2256 }
2257 }
2258}
2259
2260void ceph_mdsc_submit_request(struct ceph_mds_client *mdsc,
2261 struct ceph_mds_request *req)
2262{
2263 dout("submit_request on %p\n", req);
2264 mutex_lock(&mdsc->mutex);
2265 __register_request(mdsc, req, NULL);
2266 __do_request(mdsc, req);
2267 mutex_unlock(&mdsc->mutex);
2268}
2269
2270/*
2271 * Synchrously perform an mds request. Take care of all of the
2272 * session setup, forwarding, retry details.
2273 */
2274int ceph_mdsc_do_request(struct ceph_mds_client *mdsc,
2275 struct inode *dir,
2276 struct ceph_mds_request *req)
2277{
2278 int err;
2279
2280 dout("do_request on %p\n", req);
2281
2282 /* take CAP_PIN refs for r_inode, r_locked_dir, r_old_dentry */
2283 if (req->r_inode)
2284 ceph_get_cap_refs(ceph_inode(req->r_inode), CEPH_CAP_PIN);
2285 if (req->r_locked_dir)
2286 ceph_get_cap_refs(ceph_inode(req->r_locked_dir), CEPH_CAP_PIN);
844d87c3 2287 if (req->r_old_dentry_dir)
41b02e1f
SW		 2288 ceph_get_cap_refs(ceph_inode(req->r_old_dentry_dir),
2289 CEPH_CAP_PIN);
2f2dc053 2290
5ea5c5e0
YZ		 2291 /* deny access to directories with pool_ns layouts */
2292 if (req->r_inode && S_ISDIR(req->r_inode->i_mode) &&
2293 ceph_inode(req->r_inode)->i_pool_ns_len)
2294 return -EIO;
2295 if (req->r_locked_dir &&
2296 ceph_inode(req->r_locked_dir)->i_pool_ns_len)
2297 return -EIO;
2298
2f2dc053
SW		 2299 /* issue */
2300 mutex_lock(&mdsc->mutex);
2301 __register_request(mdsc, req, dir);
2302 __do_request(mdsc, req);
2303
e1518c7c
SW		 2304 if (req->r_err) {
2305 err = req->r_err;
e1518c7c 2306 goto out;
2f2dc053
SW		 2307 }
2308
e1518c7c
SW		 2309 /* wait */
2310 mutex_unlock(&mdsc->mutex);
2311 dout("do_request waiting\n");
5be73034 2312 if (!req->r_timeout && req->r_wait_for_completion) {
9280be24 2313 err = req->r_wait_for_completion(mdsc, req);
e1518c7c 2314 } else {
5be73034
ID		 2315 long timeleft = wait_for_completion_killable_timeout(
2316 &req->r_completion,
2317 ceph_timeout_jiffies(req->r_timeout));
2318 if (timeleft > 0)
2319 err = 0;
2320 else if (!timeleft)
2321 err = -EIO; /* timed out */
2322 else
2323 err = timeleft; /* killed */
e1518c7c
SW		 2324 }
2325 dout("do_request waited, got %d\n", err);
2326 mutex_lock(&mdsc->mutex);
5b1daecd 2327
e1518c7c
SW		 2328 /* only abort if we didn't race with a real reply */
2329 if (req->r_got_result) {
2330 err = le32_to_cpu(req->r_reply_info.head->result);
2331 } else if (err < 0) {
2332 dout("aborted request %lld with %d\n", req->r_tid, err);
b4556396
SW		 2333
2334 /*
2335 * ensure we aren't running concurrently with
2336 * ceph_fill_trace or ceph_readdir_prepopulate, which
2337 * rely on locks (dir mutex) held by our caller.
2338 */
2339 mutex_lock(&req->r_fill_mutex);
e1518c7c
SW		 2340 req->r_err = err;
2341 req->r_aborted = true;
b4556396 2342 mutex_unlock(&req->r_fill_mutex);
5b1daecd 2343
e1518c7c 2344 if (req->r_locked_dir &&
167c9e35
SW		 2345 (req->r_op & CEPH_MDS_OP_WRITE))
2346 ceph_invalidate_dir_request(req);
2f2dc053 2347 } else {
e1518c7c 2348 err = req->r_err;
2f2dc053 2349 }
2f2dc053 2350
e1518c7c
SW		 2351out:
2352 mutex_unlock(&mdsc->mutex);
2f2dc053
SW		 2353 dout("do_request %p done, result %d\n", req, err);
2354 return err;
2355}
2356
167c9e35 2357/*
2f276c51 2358 * Invalidate dir's completeness, dentry lease state on an aborted MDS
167c9e35
SW		 2359 * namespace request.
2360 */
2361void ceph_invalidate_dir_request(struct ceph_mds_request *req)
2362{
2363 struct inode *inode = req->r_locked_dir;
167c9e35 2364
2f276c51 2365 dout("invalidate_dir_request %p (complete, lease(s))\n", inode);
167c9e35 2366
2f276c51 2367 ceph_dir_clear_complete(inode);
167c9e35
SW		 2368 if (req->r_dentry)
2369 ceph_invalidate_dentry_lease(req->r_dentry);
2370 if (req->r_old_dentry)
2371 ceph_invalidate_dentry_lease(req->r_old_dentry);
2372}
2373
2f2dc053
SW		 2374/*
2375 * Handle mds reply.
2376 *
2377 * We take the session mutex and parse and process the reply immediately.
2378 * This preserves the logical ordering of replies, capabilities, etc., sent
2379 * by the MDS as they are applied to our local cache.
2380 */
2381static void handle_reply(struct ceph_mds_session *session, struct ceph_msg *msg)
2382{
2383 struct ceph_mds_client *mdsc = session->s_mdsc;
2384 struct ceph_mds_request *req;
2385 struct ceph_mds_reply_head *head = msg->front.iov_base;
2386 struct ceph_mds_reply_info_parsed *rinfo; /* parsed reply info */
982d6011 2387 struct ceph_snap_realm *realm;
2f2dc053
SW		 2388 u64 tid;
2389 int err, result;
2600d2dd 2390 int mds = session->s_mds;
2f2dc053 2391
2f2dc053
SW		 2392 if (msg->front.iov_len < sizeof(*head)) {
2393 pr_err("mdsc_handle_reply got corrupt (short) reply\n");
9ec7cab1 2394 ceph_msg_dump(msg);
2f2dc053
SW		 2395 return;
2396 }
2397
2398 /* get request, session */
6df058c0 2399 tid = le64_to_cpu(msg->hdr.tid);
2f2dc053 2400 mutex_lock(&mdsc->mutex);
fcd00b68 2401 req = lookup_get_request(mdsc, tid);
2f2dc053
SW		 2402 if (!req) {
2403 dout("handle_reply on unknown tid %llu\n", tid);
2404 mutex_unlock(&mdsc->mutex);
2405 return;
2406 }
2407 dout("handle_reply %p\n", req);
2f2dc053
SW		 2408
2409 /* correct session? */
d96d6049 2410 if (req->r_session != session) {
2f2dc053
SW		 2411 pr_err("mdsc_handle_reply got %llu on session mds%d"
2412 " not mds%d\n", tid, session->s_mds,
2413 req->r_session ? req->r_session->s_mds : -1);
2414 mutex_unlock(&mdsc->mutex);
2415 goto out;
2416 }
2417
2418 /* dup? */
2419 if ((req->r_got_unsafe && !head->safe) ||
2420 (req->r_got_safe && head->safe)) {
f3ae1b97 2421 pr_warn("got a dup %s reply on %llu from mds%d\n",
2f2dc053
SW		 2422 head->safe ? "safe" : "unsafe", tid, mds);
2423 mutex_unlock(&mdsc->mutex);
2424 goto out;
2425 }
1550d34e 2426 if (req->r_got_safe) {
f3ae1b97 2427 pr_warn("got unsafe after safe on %llu from mds%d\n",
85792d0d
SW		 2428 tid, mds);
2429 mutex_unlock(&mdsc->mutex);
2430 goto out;
2431 }
2f2dc053
SW		 2432
2433 result = le32_to_cpu(head->result);
2434
2435 /*
e55b71f8
GF		 2436 * Handle an ESTALE
2437 * if we're not talking to the authority, send to them
2438 * if the authority has changed while we weren't looking,
2439 * send to new authority
2440 * Otherwise we just have to return an ESTALE
2f2dc053
SW		 2441 */
2442 if (result == -ESTALE) {
e55b71f8 2443 dout("got ESTALE on request %llu", req->r_tid);
51da8e8c 2444 req->r_resend_mds = -1;
ca18bede 2445 if (req->r_direct_mode != USE_AUTH_MDS) {
e55b71f8
GF		 2446 dout("not using auth, setting for that now");
2447 req->r_direct_mode = USE_AUTH_MDS;
2f2dc053
SW		 2448 __do_request(mdsc, req);
2449 mutex_unlock(&mdsc->mutex);
2450 goto out;
e55b71f8 2451 } else {
ca18bede
YZ		 2452 int mds = __choose_mds(mdsc, req);
2453 if (mds >= 0 && mds != req->r_session->s_mds) {
2454 dout("but auth changed, so resending");
e55b71f8
GF		 2455 __do_request(mdsc, req);
2456 mutex_unlock(&mdsc->mutex);
2457 goto out;
2458 }
2f2dc053 2459 }
e55b71f8 2460 dout("have to return ESTALE on request %llu", req->r_tid);
2f2dc053
SW		 2461 }
2462
e55b71f8 2463
2f2dc053
SW		 2464 if (head->safe) {
2465 req->r_got_safe = true;
2466 __unregister_request(mdsc, req);
2f2dc053
SW		 2467
2468 if (req->r_got_unsafe) {
2469 /*
2470 * We already handled the unsafe response, now do the
2471 * cleanup. No need to examine the response; the MDS
2472 * doesn't include any result info in the safe
2473 * response. And even if it did, there is nothing
2474 * useful we could do with a revised return value.
2475 */
2476 dout("got safe reply %llu, mds%d\n", tid, mds);
2477 list_del_init(&req->r_unsafe_item);
2478
2479 /* last unsafe request during umount? */
44ca18f2 2480 if (mdsc->stopping && !__get_oldest_req(mdsc))
03066f23 2481 complete_all(&mdsc->safe_umount_waiters);
2f2dc053
SW		 2482 mutex_unlock(&mdsc->mutex);
2483 goto out;
2484 }
e1518c7c 2485 } else {
2f2dc053
SW		 2486 req->r_got_unsafe = true;
2487 list_add_tail(&req->r_unsafe_item, &req->r_session->s_unsafe);
4c06ace8
YZ		 2488 if (req->r_unsafe_dir) {
2489 struct ceph_inode_info *ci =
2490 ceph_inode(req->r_unsafe_dir);
2491 spin_lock(&ci->i_unsafe_lock);
2492 list_add_tail(&req->r_unsafe_dir_item,
2493 &ci->i_unsafe_dirops);
2494 spin_unlock(&ci->i_unsafe_lock);
2495 }
2f2dc053
SW		 2496 }
2497
2498 dout("handle_reply tid %lld result %d\n", tid, result);
2499 rinfo = &req->r_reply_info;
14303d20 2500 err = parse_reply_info(msg, rinfo, session->s_con.peer_features);
2f2dc053
SW		 2501 mutex_unlock(&mdsc->mutex);
2502
2503 mutex_lock(&session->s_mutex);
2504 if (err < 0) {
25933abd 2505 pr_err("mdsc_handle_reply got corrupt reply mds%d(tid:%lld)\n", mds, tid);
9ec7cab1 2506 ceph_msg_dump(msg);
2f2dc053
SW		 2507 goto out_err;
2508 }
2509
2510 /* snap trace */
982d6011 2511 realm = NULL;
2f2dc053
SW		 2512 if (rinfo->snapblob_len) {
2513 down_write(&mdsc->snap_rwsem);
2514 ceph_update_snap_trace(mdsc, rinfo->snapblob,
982d6011
YZ		 2515 rinfo->snapblob + rinfo->snapblob_len,
2516 le32_to_cpu(head->op) == CEPH_MDS_OP_RMSNAP,
2517 &realm);
2f2dc053
SW		 2518 downgrade_write(&mdsc->snap_rwsem);
2519 } else {
2520 down_read(&mdsc->snap_rwsem);
2521 }
2522
2523 /* insert trace into our cache */
b4556396 2524 mutex_lock(&req->r_fill_mutex);
315f2408 2525 current->journal_info = req;
3d14c5d2 2526 err = ceph_fill_trace(mdsc->fsc->sb, req, req->r_session);
2f2dc053 2527 if (err == 0) {
6e8575fa 2528 if (result == 0 && (req->r_op == CEPH_MDS_OP_READDIR ||
81c6aea5 2529 req->r_op == CEPH_MDS_OP_LSSNAP))
2f2dc053 2530 ceph_readdir_prepopulate(req, req->r_session);
37151668 2531 ceph_unreserve_caps(mdsc, &req->r_caps_reservation);
2f2dc053 2532 }
315f2408 2533 current->journal_info = NULL;
b4556396 2534 mutex_unlock(&req->r_fill_mutex);
2f2dc053
SW		 2535
2536 up_read(&mdsc->snap_rwsem);
982d6011
YZ		 2537 if (realm)
2538 ceph_put_snap_realm(mdsc, realm);
68cd5b4b
YZ		 2539
2540 if (err == 0 && req->r_got_unsafe && req->r_target_inode) {
2541 struct ceph_inode_info *ci = ceph_inode(req->r_target_inode);
2542 spin_lock(&ci->i_unsafe_lock);
2543 list_add_tail(&req->r_unsafe_target_item, &ci->i_unsafe_iops);
2544 spin_unlock(&ci->i_unsafe_lock);
2545 }
2f2dc053 2546out_err:
e1518c7c
SW		 2547 mutex_lock(&mdsc->mutex);
2548 if (!req->r_aborted) {
2549 if (err) {
2550 req->r_err = err;
2551 } else {
5fdb1389 2552 req->r_reply = ceph_msg_get(msg);
e1518c7c
SW		 2553 req->r_got_result = true;
2554 }
2f2dc053 2555 } else {
e1518c7c 2556 dout("reply arrived after request %lld was aborted\n", tid);
2f2dc053 2557 }
e1518c7c 2558 mutex_unlock(&mdsc->mutex);
2f2dc053 2559
2f2dc053
SW		 2560 mutex_unlock(&session->s_mutex);
2561
2562 /* kick calling process */
2563 complete_request(mdsc, req);
2564out:
2565 ceph_mdsc_put_request(req);
2566 return;
2567}
2568
2569
2570
2571/*
2572 * handle mds notification that our request has been forwarded.
2573 */
2600d2dd
SW		 2574static void handle_forward(struct ceph_mds_client *mdsc,
2575 struct ceph_mds_session *session,
2576 struct ceph_msg *msg)
2f2dc053
SW		 2577{
2578 struct ceph_mds_request *req;
a1ea787c 2579 u64 tid = le64_to_cpu(msg->hdr.tid);
2f2dc053
SW		 2580 u32 next_mds;
2581 u32 fwd_seq;
2f2dc053
SW		 2582 int err = -EINVAL;
2583 void *p = msg->front.iov_base;
2584 void *end = p + msg->front.iov_len;
2f2dc053 2585
a1ea787c 2586 ceph_decode_need(&p, end, 2*sizeof(u32), bad);
c89136ea
SW		 2587 next_mds = ceph_decode_32(&p);
2588 fwd_seq = ceph_decode_32(&p);
2f2dc053
SW		 2589
2590 mutex_lock(&mdsc->mutex);
fcd00b68 2591 req = lookup_get_request(mdsc, tid);
2f2dc053 2592 if (!req) {
2a8e5e36 2593 dout("forward tid %llu to mds%d - req dne\n", tid, next_mds);
2f2dc053
SW		 2594 goto out; /* dup reply? */
2595 }
2596
2a8e5e36
SW		 2597 if (req->r_aborted) {
2598 dout("forward tid %llu aborted, unregistering\n", tid);
2599 __unregister_request(mdsc, req);
2600 } else if (fwd_seq <= req->r_num_fwd) {
2601 dout("forward tid %llu to mds%d - old seq %d <= %d\n",
2f2dc053
SW		 2602 tid, next_mds, req->r_num_fwd, fwd_seq);
2603 } else {
2604 /* resend. forward race not possible; mds would drop */
2a8e5e36
SW		 2605 dout("forward tid %llu to mds%d (we resend)\n", tid, next_mds);
2606 BUG_ON(req->r_err);
2607 BUG_ON(req->r_got_result);
3de22be6 2608 req->r_attempts = 0;
2f2dc053
SW		 2609 req->r_num_fwd = fwd_seq;
2610 req->r_resend_mds = next_mds;
2611 put_request_session(req);
2612 __do_request(mdsc, req);
2613 }
2614 ceph_mdsc_put_request(req);
2615out:
2616 mutex_unlock(&mdsc->mutex);
2617 return;
2618
2619bad:
2620 pr_err("mdsc_handle_forward decode error err=%d\n", err);
2621}
2622
2623/*
2624 * handle a mds session control message
2625 */
2626static void handle_session(struct ceph_mds_session *session,
2627 struct ceph_msg *msg)
2628{
2629 struct ceph_mds_client *mdsc = session->s_mdsc;
2630 u32 op;
2631 u64 seq;
2600d2dd 2632 int mds = session->s_mds;
2f2dc053
SW		 2633 struct ceph_mds_session_head *h = msg->front.iov_base;
2634 int wake = 0;
2635
2f2dc053
SW		 2636 /* decode */
2637 if (msg->front.iov_len != sizeof(*h))
2638 goto bad;
2639 op = le32_to_cpu(h->op);
2640 seq = le64_to_cpu(h->seq);
2641
2642 mutex_lock(&mdsc->mutex);
2600d2dd
SW		 2643 if (op == CEPH_SESSION_CLOSE)
2644 __unregister_session(mdsc, session);
2f2dc053
SW		 2645 /* FIXME: this ttl calculation is generous */
2646 session->s_ttl = jiffies + HZ*mdsc->mdsmap->m_session_autoclose;
2647 mutex_unlock(&mdsc->mutex);
2648
2649 mutex_lock(&session->s_mutex);
2650
2651 dout("handle_session mds%d %s %p state %s seq %llu\n",
2652 mds, ceph_session_op_name(op), session,
a687ecaf 2653 ceph_session_state_name(session->s_state), seq);
2f2dc053
SW		 2654
2655 if (session->s_state == CEPH_MDS_SESSION_HUNG) {
2656 session->s_state = CEPH_MDS_SESSION_OPEN;
2657 pr_info("mds%d came back\n", session->s_mds);
2658 }
2659
2660 switch (op) {
2661 case CEPH_SESSION_OPEN:
29790f26
SW		 2662 if (session->s_state == CEPH_MDS_SESSION_RECONNECTING)
2663 pr_info("mds%d reconnect success\n", session->s_mds);
2f2dc053
SW		 2664 session->s_state = CEPH_MDS_SESSION_OPEN;
2665 renewed_caps(mdsc, session, 0);
2666 wake = 1;
2667 if (mdsc->stopping)
2668 __close_session(mdsc, session);
2669 break;
2670
2671 case CEPH_SESSION_RENEWCAPS:
2672 if (session->s_renew_seq == seq)
2673 renewed_caps(mdsc, session, 1);
2674 break;
2675
2676 case CEPH_SESSION_CLOSE:
29790f26
SW		 2677 if (session->s_state == CEPH_MDS_SESSION_RECONNECTING)
2678 pr_info("mds%d reconnect denied\n", session->s_mds);
1c841a96 2679 cleanup_session_requests(mdsc, session);
2f2dc053 2680 remove_session_caps(session);
656e4382 2681 wake = 2; /* for good measure */
f3c60c59 2682 wake_up_all(&mdsc->session_close_wq);
2f2dc053
SW		 2683 break;
2684
2685 case CEPH_SESSION_STALE:
2686 pr_info("mds%d caps went stale, renewing\n",
2687 session->s_mds);
d8fb02ab 2688 spin_lock(&session->s_gen_ttl_lock);
2f2dc053 2689 session->s_cap_gen++;
1ce208a6 2690 session->s_cap_ttl = jiffies - 1;
d8fb02ab 2691 spin_unlock(&session->s_gen_ttl_lock);
2f2dc053
SW		 2692 send_renew_caps(mdsc, session);
2693 break;
2694
2695 case CEPH_SESSION_RECALL_STATE:
2696 trim_caps(mdsc, session, le32_to_cpu(h->max_caps));
2697 break;
2698
186e4f7a
YZ		 2699 case CEPH_SESSION_FLUSHMSG:
2700 send_flushmsg_ack(mdsc, session, seq);
2701 break;
2702
03f4fcb0
YZ		 2703 case CEPH_SESSION_FORCE_RO:
2704 dout("force_session_readonly %p\n", session);
2705 spin_lock(&session->s_cap_lock);
2706 session->s_readonly = true;
2707 spin_unlock(&session->s_cap_lock);
2708 wake_up_session_caps(session, 0);
2709 break;
2710
2f2dc053
SW		 2711 default:
2712 pr_err("mdsc_handle_session bad op %d mds%d\n", op, mds);
2713 WARN_ON(1);
2714 }
2715
2716 mutex_unlock(&session->s_mutex);
2717 if (wake) {
2718 mutex_lock(&mdsc->mutex);
2719 __wake_requests(mdsc, &session->s_waiting);
656e4382
YZ		 2720 if (wake == 2)
2721 kick_requests(mdsc, mds);
2f2dc053
SW		 2722 mutex_unlock(&mdsc->mutex);
2723 }
2724 return;
2725
2726bad:
2727 pr_err("mdsc_handle_session corrupt message mds%d len %d\n", mds,
2728 (int)msg->front.iov_len);
9ec7cab1 2729 ceph_msg_dump(msg);
2f2dc053
SW		 2730 return;
2731}
2732
2733
2734/*
2735 * called under session->mutex.
2736 */
2737static void replay_unsafe_requests(struct ceph_mds_client *mdsc,
2738 struct ceph_mds_session *session)
2739{
2740 struct ceph_mds_request *req, *nreq;
3de22be6 2741 struct rb_node *p;
2f2dc053
SW		 2742 int err;
2743
2744 dout("replay_unsafe_requests mds%d\n", session->s_mds);
2745
2746 mutex_lock(&mdsc->mutex);
2747 list_for_each_entry_safe(req, nreq, &session->s_unsafe, r_unsafe_item) {
6e6f0923 2748 err = __prepare_send_request(mdsc, req, session->s_mds, true);
2f2dc053
SW		 2749 if (!err) {
2750 ceph_msg_get(req->r_request);
2751 ceph_con_send(&session->s_con, req->r_request);
2752 }
2753 }
3de22be6
YZ		 2754
2755 /*
2756 * also re-send old requests when MDS enters reconnect stage. So that MDS
2757 * can process completed request in clientreplay stage.
2758 */
2759 p = rb_first(&mdsc->request_tree);
2760 while (p) {
2761 req = rb_entry(p, struct ceph_mds_request, r_node);
2762 p = rb_next(p);
2763 if (req->r_got_unsafe)
2764 continue;
2765 if (req->r_attempts == 0)
2766 continue; /* only old requests */
2767 if (req->r_session &&
2768 req->r_session->s_mds == session->s_mds) {
6e6f0923
YZ		 2769 err = __prepare_send_request(mdsc, req,
2770 session->s_mds, true);
3de22be6
YZ		 2771 if (!err) {
2772 ceph_msg_get(req->r_request);
2773 ceph_con_send(&session->s_con, req->r_request);
2774 }
2775 }
2776 }
2f2dc053
SW		 2777 mutex_unlock(&mdsc->mutex);
2778}
2779
2780/*
2781 * Encode information about a cap for a reconnect with the MDS.
2782 */
2f2dc053
SW		 2783static int encode_caps_cb(struct inode *inode, struct ceph_cap *cap,
2784 void *arg)
2785{
20cb34ae
SW		 2786 union {
2787 struct ceph_mds_cap_reconnect v2;
2788 struct ceph_mds_cap_reconnect_v1 v1;
2789 } rec;
2790 size_t reclen;
2f2dc053 2791 struct ceph_inode_info *ci;
20cb34ae
SW		 2792 struct ceph_reconnect_state *recon_state = arg;
2793 struct ceph_pagelist *pagelist = recon_state->pagelist;
2f2dc053
SW		 2794 char *path;
2795 int pathlen, err;
2796 u64 pathbase;
2797 struct dentry *dentry;
2798
2799 ci = cap->ci;
2800
2801 dout(" adding %p ino %llx.%llx cap %p %lld %s\n",
2802 inode, ceph_vinop(inode), cap, cap->cap_id,
2803 ceph_cap_string(cap->issued));
93cea5be
SW		 2804 err = ceph_pagelist_encode_64(pagelist, ceph_ino(inode));
2805 if (err)
2806 return err;
2f2dc053
SW		 2807
2808 dentry = d_find_alias(inode);
2809 if (dentry) {
2810 path = ceph_mdsc_build_path(dentry, &pathlen, &pathbase, 0);
2811 if (IS_ERR(path)) {
2812 err = PTR_ERR(path);
e072f8aa 2813 goto out_dput;
2f2dc053
SW		 2814 }
2815 } else {
2816 path = NULL;
2817 pathlen = 0;
2818 }
93cea5be
SW		 2819 err = ceph_pagelist_encode_string(pagelist, path, pathlen);
2820 if (err)
e072f8aa 2821 goto out_free;
2f2dc053 2822
be655596 2823 spin_lock(&ci->i_ceph_lock);
2f2dc053
SW		 2824 cap->seq = 0; /* reset cap seq */
2825 cap->issue_seq = 0; /* and issue_seq */
667ca05c 2826 cap->mseq = 0; /* and migrate_seq */
99a9c273 2827 cap->cap_gen = cap->session->s_cap_gen;
20cb34ae
SW		 2828
2829 if (recon_state->flock) {
2830 rec.v2.cap_id = cpu_to_le64(cap->cap_id);
2831 rec.v2.wanted = cpu_to_le32(__ceph_caps_wanted(ci));
2832 rec.v2.issued = cpu_to_le32(cap->issued);
2833 rec.v2.snaprealm = cpu_to_le64(ci->i_snap_realm->ino);
2834 rec.v2.pathbase = cpu_to_le64(pathbase);
2835 rec.v2.flock_len = 0;
2836 reclen = sizeof(rec.v2);
2837 } else {
2838 rec.v1.cap_id = cpu_to_le64(cap->cap_id);
2839 rec.v1.wanted = cpu_to_le32(__ceph_caps_wanted(ci));
2840 rec.v1.issued = cpu_to_le32(cap->issued);
2841 rec.v1.size = cpu_to_le64(inode->i_size);
2842 ceph_encode_timespec(&rec.v1.mtime, &inode->i_mtime);
2843 ceph_encode_timespec(&rec.v1.atime, &inode->i_atime);
2844 rec.v1.snaprealm = cpu_to_le64(ci->i_snap_realm->ino);
2845 rec.v1.pathbase = cpu_to_le64(pathbase);
2846 reclen = sizeof(rec.v1);
2847 }
be655596 2848 spin_unlock(&ci->i_ceph_lock);
2f2dc053 2849
40819f6f
GF		 2850 if (recon_state->flock) {
2851 int num_fcntl_locks, num_flock_locks;
39be95e9
JS		 2852 struct ceph_filelock *flocks;
2853
2854encode_again:
39be95e9 2855 ceph_count_locks(inode, &num_fcntl_locks, &num_flock_locks);
39be95e9
JS		 2856 flocks = kmalloc((num_fcntl_locks+num_flock_locks) *
2857 sizeof(struct ceph_filelock), GFP_NOFS);
2858 if (!flocks) {
2859 err = -ENOMEM;
2860 goto out_free;
2861 }
39be95e9
JS		 2862 err = ceph_encode_locks_to_buffer(inode, flocks,
2863 num_fcntl_locks,
2864 num_flock_locks);
39be95e9
JS		 2865 if (err) {
2866 kfree(flocks);
2867 if (err == -ENOSPC)
2868 goto encode_again;
2869 goto out_free;
2870 }
2871 /*
2872 * number of encoded locks is stable, so copy to pagelist
2873 */
2874 rec.v2.flock_len = cpu_to_le32(2*sizeof(u32) +
2875 (num_fcntl_locks+num_flock_locks) *
2876 sizeof(struct ceph_filelock));
2877 err = ceph_pagelist_append(pagelist, &rec, reclen);
2878 if (!err)
2879 err = ceph_locks_to_pagelist(flocks, pagelist,
2880 num_fcntl_locks,
2881 num_flock_locks);
2882 kfree(flocks);
3612abbd
SW		 2883 } else {
2884 err = ceph_pagelist_append(pagelist, &rec, reclen);
40819f6f 2885 }
44c99757
YZ		 2886
2887 recon_state->nr_caps++;
e072f8aa 2888out_free:
2f2dc053 2889 kfree(path);
e072f8aa 2890out_dput:
2f2dc053 2891 dput(dentry);
93cea5be 2892 return err;
2f2dc053
SW		 2893}
2894
2895
2896/*
2897 * If an MDS fails and recovers, clients need to reconnect in order to
2898 * reestablish shared state. This includes all caps issued through
2899 * this session _and_ the snap_realm hierarchy. Because it's not
2900 * clear which snap realms the mds cares about, we send everything we
2901 * know about.. that ensures we'll then get any new info the
2902 * recovering MDS might have.
2903 *
2904 * This is a relatively heavyweight operation, but it's rare.
2905 *
2906 * called with mdsc->mutex held.
2907 */
34b6c855
SW		 2908static void send_mds_reconnect(struct ceph_mds_client *mdsc,
2909 struct ceph_mds_session *session)
2f2dc053 2910{
2f2dc053 2911 struct ceph_msg *reply;
a105f00c 2912 struct rb_node *p;
34b6c855 2913 int mds = session->s_mds;
9abf82b8 2914 int err = -ENOMEM;
44c99757 2915 int s_nr_caps;
93cea5be 2916 struct ceph_pagelist *pagelist;
20cb34ae 2917 struct ceph_reconnect_state recon_state;
2f2dc053 2918
34b6c855 2919 pr_info("mds%d reconnect start\n", mds);
2f2dc053 2920
93cea5be
SW		 2921 pagelist = kmalloc(sizeof(*pagelist), GFP_NOFS);
2922 if (!pagelist)
2923 goto fail_nopagelist;
2924 ceph_pagelist_init(pagelist);
2925
b61c2763 2926 reply = ceph_msg_new(CEPH_MSG_CLIENT_RECONNECT, 0, GFP_NOFS, false);
a79832f2 2927 if (!reply)
93cea5be 2928 goto fail_nomsg;
93cea5be 2929
34b6c855
SW		 2930 mutex_lock(&session->s_mutex);
2931 session->s_state = CEPH_MDS_SESSION_RECONNECTING;
2932 session->s_seq = 0;
2f2dc053 2933
2f2dc053 2934 dout("session %p state %s\n", session,
a687ecaf 2935 ceph_session_state_name(session->s_state));
2f2dc053 2936
99a9c273
YZ		 2937 spin_lock(&session->s_gen_ttl_lock);
2938 session->s_cap_gen++;
2939 spin_unlock(&session->s_gen_ttl_lock);
2940
2941 spin_lock(&session->s_cap_lock);
03f4fcb0
YZ		 2942 /* don't know if session is readonly */
2943 session->s_readonly = 0;
99a9c273
YZ		 2944 /*
2945 * notify __ceph_remove_cap() that we are composing cap reconnect.
2946 * If a cap get released before being added to the cap reconnect,
2947 * __ceph_remove_cap() should skip queuing cap release.
2948 */
2949 session->s_cap_reconnect = 1;
e01a5946 2950 /* drop old cap expires; we're about to reestablish that state */
745a8e3b 2951 cleanup_cap_releases(mdsc, session);
e01a5946 2952
5d23371f 2953 /* trim unused caps to reduce MDS's cache rejoin time */
c0bd50e2
YZ		 2954 if (mdsc->fsc->sb->s_root)
2955 shrink_dcache_parent(mdsc->fsc->sb->s_root);
5d23371f
YZ		 2956
2957 ceph_con_close(&session->s_con);
2958 ceph_con_open(&session->s_con,
2959 CEPH_ENTITY_TYPE_MDS, mds,
2960 ceph_mdsmap_get_addr(mdsc->mdsmap, mds));
2961
2962 /* replay unsafe requests */
2963 replay_unsafe_requests(mdsc, session);
2964
2965 down_read(&mdsc->snap_rwsem);
2966
2f2dc053 2967 /* traverse this session's caps */
44c99757
YZ		 2968 s_nr_caps = session->s_nr_caps;
2969 err = ceph_pagelist_encode_32(pagelist, s_nr_caps);
93cea5be
SW		 2970 if (err)
2971 goto fail;
20cb34ae 2972
44c99757 2973 recon_state.nr_caps = 0;
20cb34ae
SW		 2974 recon_state.pagelist = pagelist;
2975 recon_state.flock = session->s_con.peer_features & CEPH_FEATURE_FLOCK;
2976 err = iterate_session_caps(session, encode_caps_cb, &recon_state);
2f2dc053 2977 if (err < 0)
9abf82b8 2978 goto fail;
2f2dc053 2979
99a9c273
YZ		 2980 spin_lock(&session->s_cap_lock);
2981 session->s_cap_reconnect = 0;
2982 spin_unlock(&session->s_cap_lock);
2983
2f2dc053
SW		 2984 /*
2985 * snaprealms. we provide mds with the ino, seq (version), and
2986 * parent for all of our realms. If the mds has any newer info,
2987 * it will tell us.
2988 */
a105f00c
SW		 2989 for (p = rb_first(&mdsc->snap_realms); p; p = rb_next(p)) {
2990 struct ceph_snap_realm *realm =
2991 rb_entry(p, struct ceph_snap_realm, node);
93cea5be 2992 struct ceph_mds_snaprealm_reconnect sr_rec;
2f2dc053
SW		 2993
2994 dout(" adding snap realm %llx seq %lld parent %llx\n",
2995 realm->ino, realm->seq, realm->parent_ino);
93cea5be
SW		 2996 sr_rec.ino = cpu_to_le64(realm->ino);
2997 sr_rec.seq = cpu_to_le64(realm->seq);
2998 sr_rec.parent = cpu_to_le64(realm->parent_ino);
2999 err = ceph_pagelist_append(pagelist, &sr_rec, sizeof(sr_rec));
3000 if (err)
3001 goto fail;
2f2dc053 3002 }
2f2dc053 3003
20cb34ae
SW		 3004 if (recon_state.flock)
3005 reply->hdr.version = cpu_to_le16(2);
44c99757
YZ		 3006
3007 /* raced with cap release? */
3008 if (s_nr_caps != recon_state.nr_caps) {
3009 struct page *page = list_first_entry(&pagelist->head,
3010 struct page, lru);
3011 __le32 *addr = kmap_atomic(page);
3012 *addr = cpu_to_le32(recon_state.nr_caps);
3013 kunmap_atomic(addr);
ebf18f47 3014 }
44c99757
YZ		 3015
3016 reply->hdr.data_len = cpu_to_le32(pagelist->length);
3017 ceph_msg_data_add_pagelist(reply, pagelist);
e548e9b9
YZ		 3018
3019 ceph_early_kick_flushing_caps(mdsc, session);
3020
2f2dc053
SW		 3021 ceph_con_send(&session->s_con, reply);
3022
9abf82b8
SW		 3023 mutex_unlock(&session->s_mutex);
3024
3025 mutex_lock(&mdsc->mutex);
3026 __wake_requests(mdsc, &session->s_waiting);
3027 mutex_unlock(&mdsc->mutex);
3028
2f2dc053 3029 up_read(&mdsc->snap_rwsem);
2f2dc053
SW		 3030 return;
3031
93cea5be 3032fail:
2f2dc053 3033 ceph_msg_put(reply);
9abf82b8
SW		 3034 up_read(&mdsc->snap_rwsem);
3035 mutex_unlock(&session->s_mutex);
93cea5be
SW		 3036fail_nomsg:
3037 ceph_pagelist_release(pagelist);
93cea5be 3038fail_nopagelist:
9abf82b8 3039 pr_err("error %d preparing reconnect for mds%d\n", err, mds);
9abf82b8 3040 return;
2f2dc053
SW		 3041}
3042
3043
3044/*
3045 * compare old and new mdsmaps, kicking requests
3046 * and closing out old connections as necessary
3047 *
3048 * called under mdsc->mutex.
3049 */
3050static void check_new_map(struct ceph_mds_client *mdsc,
3051 struct ceph_mdsmap *newmap,
3052 struct ceph_mdsmap *oldmap)
3053{
3054 int i;
3055 int oldstate, newstate;
3056 struct ceph_mds_session *s;
3057
3058 dout("check_new_map new %u old %u\n",
3059 newmap->m_epoch, oldmap->m_epoch);
3060
3061 for (i = 0; i < oldmap->m_max_mds && i < mdsc->max_sessions; i++) {
3062 if (mdsc->sessions[i] == NULL)
3063 continue;
3064 s = mdsc->sessions[i];
3065 oldstate = ceph_mdsmap_get_state(oldmap, i);
3066 newstate = ceph_mdsmap_get_state(newmap, i);
3067
0deb01c9 3068 dout("check_new_map mds%d state %s%s -> %s%s (session %s)\n",
2f2dc053 3069 i, ceph_mds_state_name(oldstate),
0deb01c9 3070 ceph_mdsmap_is_laggy(oldmap, i) ? " (laggy)" : "",
2f2dc053 3071 ceph_mds_state_name(newstate),
0deb01c9 3072 ceph_mdsmap_is_laggy(newmap, i) ? " (laggy)" : "",
a687ecaf 3073 ceph_session_state_name(s->s_state));
2f2dc053 3074
3e8f43a0
YZ		 3075 if (i >= newmap->m_max_mds ||
3076 memcmp(ceph_mdsmap_get_addr(oldmap, i),
2f2dc053
SW		 3077 ceph_mdsmap_get_addr(newmap, i),
3078 sizeof(struct ceph_entity_addr))) {
3079 if (s->s_state == CEPH_MDS_SESSION_OPENING) {
3080 /* the session never opened, just close it
3081 * out now */
3082 __wake_requests(mdsc, &s->s_waiting);
2600d2dd 3083 __unregister_session(mdsc, s);
2f2dc053
SW		 3084 } else {
3085 /* just close it */
3086 mutex_unlock(&mdsc->mutex);
3087 mutex_lock(&s->s_mutex);
3088 mutex_lock(&mdsc->mutex);
3089 ceph_con_close(&s->s_con);
3090 mutex_unlock(&s->s_mutex);
3091 s->s_state = CEPH_MDS_SESSION_RESTARTING;
3092 }
2f2dc053
SW		 3093 } else if (oldstate == newstate) {
3094 continue; /* nothing new with this mds */
3095 }
3096
3097 /*
3098 * send reconnect?
3099 */
3100 if (s->s_state == CEPH_MDS_SESSION_RESTARTING &&
34b6c855
SW		 3101 newstate >= CEPH_MDS_STATE_RECONNECT) {
3102 mutex_unlock(&mdsc->mutex);
3103 send_mds_reconnect(mdsc, s);
3104 mutex_lock(&mdsc->mutex);
3105 }
2f2dc053
SW		 3106
3107 /*
29790f26 3108 * kick request on any mds that has gone active.
2f2dc053
SW		 3109 */
3110 if (oldstate < CEPH_MDS_STATE_ACTIVE &&
3111 newstate >= CEPH_MDS_STATE_ACTIVE) {
29790f26
SW		 3112 if (oldstate != CEPH_MDS_STATE_CREATING &&
3113 oldstate != CEPH_MDS_STATE_STARTING)
3114 pr_info("mds%d recovery completed\n", s->s_mds);
3115 kick_requests(mdsc, i);
2f2dc053 3116 ceph_kick_flushing_caps(mdsc, s);
0dc2570f 3117 wake_up_session_caps(s, 1);
2f2dc053
SW		 3118 }
3119 }
cb170a22
SW		 3120
3121 for (i = 0; i < newmap->m_max_mds && i < mdsc->max_sessions; i++) {
3122 s = mdsc->sessions[i];
3123 if (!s)
3124 continue;
3125 if (!ceph_mdsmap_is_laggy(newmap, i))
3126 continue;
3127 if (s->s_state == CEPH_MDS_SESSION_OPEN ||
3128 s->s_state == CEPH_MDS_SESSION_HUNG ||
3129 s->s_state == CEPH_MDS_SESSION_CLOSING) {
3130 dout(" connecting to export targets of laggy mds%d\n",
3131 i);
3132 __open_export_target_sessions(mdsc, s);
3133 }
3134 }
2f2dc053
SW		 3135}
3136
3137
3138
3139/*
3140 * leases
3141 */
3142
3143/*
3144 * caller must hold session s_mutex, dentry->d_lock
3145 */
3146void __ceph_mdsc_drop_dentry_lease(struct dentry *dentry)
3147{
3148 struct ceph_dentry_info *di = ceph_dentry(dentry);
3149
3150 ceph_put_mds_session(di->lease_session);
3151 di->lease_session = NULL;
3152}
3153
2600d2dd
SW		 3154static void handle_lease(struct ceph_mds_client *mdsc,
3155 struct ceph_mds_session *session,
3156 struct ceph_msg *msg)
2f2dc053 3157{
3d14c5d2 3158 struct super_block *sb = mdsc->fsc->sb;
2f2dc053 3159 struct inode *inode;
2f2dc053
SW		 3160 struct dentry *parent, *dentry;
3161 struct ceph_dentry_info *di;
2600d2dd 3162 int mds = session->s_mds;
2f2dc053 3163 struct ceph_mds_lease *h = msg->front.iov_base;
1e5ea23d 3164 u32 seq;
2f2dc053 3165 struct ceph_vino vino;
2f2dc053
SW		 3166 struct qstr dname;
3167 int release = 0;
3168
2f2dc053
SW		 3169 dout("handle_lease from mds%d\n", mds);
3170
3171 /* decode */
3172 if (msg->front.iov_len < sizeof(*h) + sizeof(u32))
3173 goto bad;
3174 vino.ino = le64_to_cpu(h->ino);
3175 vino.snap = CEPH_NOSNAP;
1e5ea23d 3176 seq = le32_to_cpu(h->seq);
2f2dc053
SW		 3177 dname.name = (void *)h + sizeof(*h) + sizeof(u32);
3178 dname.len = msg->front.iov_len - sizeof(*h) - sizeof(u32);
3179 if (dname.len != get_unaligned_le32(h+1))
3180 goto bad;
3181
2f2dc053
SW		 3182 /* lookup inode */
3183 inode = ceph_find_inode(sb, vino);
2f90b852
SW		 3184 dout("handle_lease %s, ino %llx %p %.*s\n",
3185 ceph_lease_op_name(h->action), vino.ino, inode,
1e5ea23d 3186 dname.len, dname.name);
6cd3bcad
YZ		 3187
3188 mutex_lock(&session->s_mutex);
3189 session->s_seq++;
3190
2f2dc053
SW		 3191 if (inode == NULL) {
3192 dout("handle_lease no inode %llx\n", vino.ino);
3193 goto release;
3194 }
2f2dc053
SW		 3195
3196 /* dentry */
3197 parent = d_find_alias(inode);
3198 if (!parent) {
3199 dout("no parent dentry on inode %p\n", inode);
3200 WARN_ON(1);
3201 goto release; /* hrm... */
3202 }
3203 dname.hash = full_name_hash(dname.name, dname.len);
3204 dentry = d_lookup(parent, &dname);
3205 dput(parent);
3206 if (!dentry)
3207 goto release;
3208
3209 spin_lock(&dentry->d_lock);
3210 di = ceph_dentry(dentry);
3211 switch (h->action) {
3212 case CEPH_MDS_LEASE_REVOKE:
3d8eb7a9 3213 if (di->lease_session == session) {
1e5ea23d
SW		 3214 if (ceph_seq_cmp(di->lease_seq, seq) > 0)
3215 h->seq = cpu_to_le32(di->lease_seq);
2f2dc053
SW		 3216 __ceph_mdsc_drop_dentry_lease(dentry);
3217 }
3218 release = 1;
3219 break;
3220
3221 case CEPH_MDS_LEASE_RENEW:
3d8eb7a9 3222 if (di->lease_session == session &&
2f2dc053
SW		 3223 di->lease_gen == session->s_cap_gen &&
3224 di->lease_renew_from &&
3225 di->lease_renew_after == 0) {
3226 unsigned long duration =
3563dbdd 3227 msecs_to_jiffies(le32_to_cpu(h->duration_ms));
2f2dc053 3228
1e5ea23d 3229 di->lease_seq = seq;
2f2dc053
SW		 3230 dentry->d_time = di->lease_renew_from + duration;
3231 di->lease_renew_after = di->lease_renew_from +
3232 (duration >> 1);
3233 di->lease_renew_from = 0;
3234 }
3235 break;
3236 }
3237 spin_unlock(&dentry->d_lock);
3238 dput(dentry);
3239
3240 if (!release)
3241 goto out;
3242
3243release:
3244 /* let's just reuse the same message */
3245 h->action = CEPH_MDS_LEASE_REVOKE_ACK;
3246 ceph_msg_get(msg);
3247 ceph_con_send(&session->s_con, msg);
3248
3249out:
3250 iput(inode);
3251 mutex_unlock(&session->s_mutex);
2f2dc053
SW		 3252 return;
3253
3254bad:
3255 pr_err("corrupt lease message\n");
9ec7cab1 3256 ceph_msg_dump(msg);
2f2dc053
SW		 3257}
3258
3259void ceph_mdsc_lease_send_msg(struct ceph_mds_session *session,
3260 struct inode *inode,
3261 struct dentry *dentry, char action,
3262 u32 seq)
3263{
3264 struct ceph_msg *msg;
3265 struct ceph_mds_lease *lease;
3266 int len = sizeof(*lease) + sizeof(u32);
3267 int dnamelen = 0;
3268
3269 dout("lease_send_msg inode %p dentry %p %s to mds%d\n",
3270 inode, dentry, ceph_lease_op_name(action), session->s_mds);
3271 dnamelen = dentry->d_name.len;
3272 len += dnamelen;
3273
b61c2763 3274 msg = ceph_msg_new(CEPH_MSG_CLIENT_LEASE, len, GFP_NOFS, false);
a79832f2 3275 if (!msg)
2f2dc053
SW		 3276 return;
3277 lease = msg->front.iov_base;
3278 lease->action = action;
2f2dc053
SW		 3279 lease->ino = cpu_to_le64(ceph_vino(inode).ino);
3280 lease->first = lease->last = cpu_to_le64(ceph_vino(inode).snap);
3281 lease->seq = cpu_to_le32(seq);
3282 put_unaligned_le32(dnamelen, lease + 1);
3283 memcpy((void *)(lease + 1) + 4, dentry->d_name.name, dnamelen);
3284
3285 /*
3286 * if this is a preemptive lease RELEASE, no need to
3287 * flush request stream, since the actual request will
3288 * soon follow.
3289 */
3290 msg->more_to_follow = (action == CEPH_MDS_LEASE_RELEASE);
3291
3292 ceph_con_send(&session->s_con, msg);
3293}
3294
3295/*
3296 * Preemptively release a lease we expect to invalidate anyway.
3297 * Pass @inode always, @dentry is optional.
3298 */
3299void ceph_mdsc_lease_release(struct ceph_mds_client *mdsc, struct inode *inode,
2f90b852 3300 struct dentry *dentry)
2f2dc053
SW		 3301{
3302 struct ceph_dentry_info *di;
3303 struct ceph_mds_session *session;
3304 u32 seq;
3305
3306 BUG_ON(inode == NULL);
3307 BUG_ON(dentry == NULL);
2f2dc053
SW		 3308
3309 /* is dentry lease valid? */
3310 spin_lock(&dentry->d_lock);
3311 di = ceph_dentry(dentry);
3312 if (!di || !di->lease_session ||
3313 di->lease_session->s_mds < 0 ||
3314 di->lease_gen != di->lease_session->s_cap_gen ||
3315 !time_before(jiffies, dentry->d_time)) {
3316 dout("lease_release inode %p dentry %p -- "
2f90b852
SW		 3317 "no lease\n",
3318 inode, dentry);
2f2dc053
SW		 3319 spin_unlock(&dentry->d_lock);
3320 return;
3321 }
3322
3323 /* we do have a lease on this dentry; note mds and seq */
3324 session = ceph_get_mds_session(di->lease_session);
3325 seq = di->lease_seq;
3326 __ceph_mdsc_drop_dentry_lease(dentry);
3327 spin_unlock(&dentry->d_lock);
3328
2f90b852
SW		 3329 dout("lease_release inode %p dentry %p to mds%d\n",
3330 inode, dentry, session->s_mds);
2f2dc053
SW		 3331 ceph_mdsc_lease_send_msg(session, inode, dentry,
3332 CEPH_MDS_LEASE_RELEASE, seq);
3333 ceph_put_mds_session(session);
3334}
3335
3336/*
3337 * drop all leases (and dentry refs) in preparation for umount
3338 */
3339static void drop_leases(struct ceph_mds_client *mdsc)
3340{
3341 int i;
3342
3343 dout("drop_leases\n");
3344 mutex_lock(&mdsc->mutex);
3345 for (i = 0; i < mdsc->max_sessions; i++) {
3346 struct ceph_mds_session *s = __ceph_lookup_mds_session(mdsc, i);
3347 if (!s)
3348 continue;
3349 mutex_unlock(&mdsc->mutex);
3350 mutex_lock(&s->s_mutex);
3351 mutex_unlock(&s->s_mutex);
3352 ceph_put_mds_session(s);
3353 mutex_lock(&mdsc->mutex);
3354 }
3355 mutex_unlock(&mdsc->mutex);
3356}
3357
3358
3359
3360/*
3361 * delayed work -- periodically trim expired leases, renew caps with mds
3362 */
3363static void schedule_delayed(struct ceph_mds_client *mdsc)
3364{
3365 int delay = 5;
3366 unsigned hz = round_jiffies_relative(HZ * delay);
3367 schedule_delayed_work(&mdsc->delayed_work, hz);
3368}
3369
3370static void delayed_work(struct work_struct *work)
3371{
3372 int i;
3373 struct ceph_mds_client *mdsc =
3374 container_of(work, struct ceph_mds_client, delayed_work.work);
3375 int renew_interval;
3376 int renew_caps;
3377
3378 dout("mdsc delayed_work\n");
afcdaea3 3379 ceph_check_delayed_caps(mdsc);
2f2dc053
SW		 3380
3381 mutex_lock(&mdsc->mutex);
3382 renew_interval = mdsc->mdsmap->m_session_timeout >> 2;
3383 renew_caps = time_after_eq(jiffies, HZ*renew_interval +
3384 mdsc->last_renew_caps);
3385 if (renew_caps)
3386 mdsc->last_renew_caps = jiffies;
3387
3388 for (i = 0; i < mdsc->max_sessions; i++) {
3389 struct ceph_mds_session *s = __ceph_lookup_mds_session(mdsc, i);
3390 if (s == NULL)
3391 continue;
3392 if (s->s_state == CEPH_MDS_SESSION_CLOSING) {
3393 dout("resending session close request for mds%d\n",
3394 s->s_mds);
3395 request_close_session(mdsc, s);
3396 ceph_put_mds_session(s);
3397 continue;
3398 }
3399 if (s->s_ttl && time_after(jiffies, s->s_ttl)) {
3400 if (s->s_state == CEPH_MDS_SESSION_OPEN) {
3401 s->s_state = CEPH_MDS_SESSION_HUNG;
3402 pr_info("mds%d hung\n", s->s_mds);
3403 }
3404 }
3405 if (s->s_state < CEPH_MDS_SESSION_OPEN) {
3406 /* this mds is failed or recovering, just wait */
3407 ceph_put_mds_session(s);
3408 continue;
3409 }
3410 mutex_unlock(&mdsc->mutex);
3411
3412 mutex_lock(&s->s_mutex);
3413 if (renew_caps)
3414 send_renew_caps(mdsc, s);
3415 else
3416 ceph_con_keepalive(&s->s_con);
aab53dd9
SW		 3417 if (s->s_state == CEPH_MDS_SESSION_OPEN ||
3418 s->s_state == CEPH_MDS_SESSION_HUNG)
3d7ded4d 3419 ceph_send_cap_releases(mdsc, s);
2f2dc053
SW		 3420 mutex_unlock(&s->s_mutex);
3421 ceph_put_mds_session(s);
3422
3423 mutex_lock(&mdsc->mutex);
3424 }
3425 mutex_unlock(&mdsc->mutex);
3426
3427 schedule_delayed(mdsc);
3428}
3429
3d14c5d2 3430int ceph_mdsc_init(struct ceph_fs_client *fsc)
2f2dc053 3431
2f2dc053 3432{
3d14c5d2
YS		 3433 struct ceph_mds_client *mdsc;
3434
3435 mdsc = kzalloc(sizeof(struct ceph_mds_client), GFP_NOFS);
3436 if (!mdsc)
3437 return -ENOMEM;
3438 mdsc->fsc = fsc;
3439 fsc->mdsc = mdsc;
2f2dc053
SW		 3440 mutex_init(&mdsc->mutex);
3441 mdsc->mdsmap = kzalloc(sizeof(*mdsc->mdsmap), GFP_NOFS);
fb3101b6 3442 if (mdsc->mdsmap == NULL) {
3443 kfree(mdsc);
2d06eeb8 3444 return -ENOMEM;
fb3101b6 3445 }
2d06eeb8 3446
2f2dc053 3447 init_completion(&mdsc->safe_umount_waiters);
f3c60c59 3448 init_waitqueue_head(&mdsc->session_close_wq);
2f2dc053
SW		 3449 INIT_LIST_HEAD(&mdsc->waiting_for_map);
3450 mdsc->sessions = NULL;
86d8f67b 3451 atomic_set(&mdsc->num_sessions, 0);
2f2dc053
SW		 3452 mdsc->max_sessions = 0;
3453 mdsc->stopping = 0;
affbc19a 3454 mdsc->last_snap_seq = 0;
2f2dc053 3455 init_rwsem(&mdsc->snap_rwsem);
a105f00c 3456 mdsc->snap_realms = RB_ROOT;
2f2dc053
SW		 3457 INIT_LIST_HEAD(&mdsc->snap_empty);
3458 spin_lock_init(&mdsc->snap_empty_lock);
3459 mdsc->last_tid = 0;
e8a7b8b1 3460 mdsc->oldest_tid = 0;
44ca18f2 3461 mdsc->request_tree = RB_ROOT;
2f2dc053
SW		 3462 INIT_DELAYED_WORK(&mdsc->delayed_work, delayed_work);
3463 mdsc->last_renew_caps = jiffies;
3464 INIT_LIST_HEAD(&mdsc->cap_delay_list);
3465 spin_lock_init(&mdsc->cap_delay_lock);
3466 INIT_LIST_HEAD(&mdsc->snap_flush_list);
3467 spin_lock_init(&mdsc->snap_flush_lock);
553adfd9 3468 mdsc->last_cap_flush_tid = 1;
8310b089 3469 mdsc->cap_flush_tree = RB_ROOT;
2f2dc053 3470 INIT_LIST_HEAD(&mdsc->cap_dirty);
db354052 3471 INIT_LIST_HEAD(&mdsc->cap_dirty_migrating);
2f2dc053
SW		 3472 mdsc->num_cap_flushing = 0;
3473 spin_lock_init(&mdsc->cap_dirty_lock);
3474 init_waitqueue_head(&mdsc->cap_flushing_wq);
3475 spin_lock_init(&mdsc->dentry_lru_lock);
3476 INIT_LIST_HEAD(&mdsc->dentry_lru);
2d06eeb8 3477
37151668 3478 ceph_caps_init(mdsc);
3d14c5d2 3479 ceph_adjust_min_caps(mdsc, fsc->min_caps);
37151668 3480
10183a69
YZ		 3481 init_rwsem(&mdsc->pool_perm_rwsem);
3482 mdsc->pool_perm_tree = RB_ROOT;
3483
5f44f142 3484 return 0;
2f2dc053
SW		 3485}
3486
3487/*
3488 * Wait for safe replies on open mds requests. If we time out, drop
3489 * all requests from the tree to avoid dangling dentry refs.
3490 */
3491static void wait_requests(struct ceph_mds_client *mdsc)
3492{
a319bf56 3493 struct ceph_options *opts = mdsc->fsc->client->options;
2f2dc053 3494 struct ceph_mds_request *req;
2f2dc053
SW		 3495
3496 mutex_lock(&mdsc->mutex);
44ca18f2 3497 if (__get_oldest_req(mdsc)) {
2f2dc053 3498 mutex_unlock(&mdsc->mutex);
44ca18f2 3499
2f2dc053
SW		 3500 dout("wait_requests waiting for requests\n");
3501 wait_for_completion_timeout(&mdsc->safe_umount_waiters,
a319bf56 3502 ceph_timeout_jiffies(opts->mount_timeout));
2f2dc053
SW		 3503
3504 /* tear down remaining requests */
44ca18f2
SW		 3505 mutex_lock(&mdsc->mutex);
3506 while ((req = __get_oldest_req(mdsc))) {
2f2dc053
SW		 3507 dout("wait_requests timed out on tid %llu\n",
3508 req->r_tid);
44ca18f2 3509 __unregister_request(mdsc, req);
2f2dc053
SW		 3510 }
3511 }
3512 mutex_unlock(&mdsc->mutex);
3513 dout("wait_requests done\n");
3514}
3515
3516/*
3517 * called before mount is ro, and before dentries are torn down.
3518 * (hmm, does this still race with new lookups?)
3519 */
3520void ceph_mdsc_pre_umount(struct ceph_mds_client *mdsc)
3521{
3522 dout("pre_umount\n");
3523 mdsc->stopping = 1;
3524
3525 drop_leases(mdsc);
afcdaea3 3526 ceph_flush_dirty_caps(mdsc);
2f2dc053 3527 wait_requests(mdsc);
17c688c3
SW		 3528
3529 /*
3530 * wait for reply handlers to drop their request refs and
3531 * their inode/dcache refs
3532 */
3533 ceph_msgr_flush();
2f2dc053
SW		 3534}
3535
3536/*
3537 * wait for all write mds requests to flush.
3538 */
3539static void wait_unsafe_requests(struct ceph_mds_client *mdsc, u64 want_tid)
3540{
80fc7314 3541 struct ceph_mds_request *req = NULL, *nextreq;
44ca18f2 3542 struct rb_node *n;
2f2dc053
SW		 3543
3544 mutex_lock(&mdsc->mutex);
3545 dout("wait_unsafe_requests want %lld\n", want_tid);
80fc7314 3546restart:
44ca18f2
SW		 3547 req = __get_oldest_req(mdsc);
3548 while (req && req->r_tid <= want_tid) {
80fc7314
SW		 3549 /* find next request */
3550 n = rb_next(&req->r_node);
3551 if (n)
3552 nextreq = rb_entry(n, struct ceph_mds_request, r_node);
3553 else
3554 nextreq = NULL;
e8a7b8b1
YZ		 3555 if (req->r_op != CEPH_MDS_OP_SETFILELOCK &&
3556 (req->r_op & CEPH_MDS_OP_WRITE)) {
44ca18f2
SW		 3557 /* write op */
3558 ceph_mdsc_get_request(req);
80fc7314
SW		 3559 if (nextreq)
3560 ceph_mdsc_get_request(nextreq);
44ca18f2
SW		 3561 mutex_unlock(&mdsc->mutex);
3562 dout("wait_unsafe_requests wait on %llu (want %llu)\n",
3563 req->r_tid, want_tid);
3564 wait_for_completion(&req->r_safe_completion);
3565 mutex_lock(&mdsc->mutex);
44ca18f2 3566 ceph_mdsc_put_request(req);
80fc7314
SW		 3567 if (!nextreq)
3568 break; /* next dne before, so we're done! */
3569 if (RB_EMPTY_NODE(&nextreq->r_node)) {
3570 /* next request was removed from tree */
3571 ceph_mdsc_put_request(nextreq);
3572 goto restart;
3573 }
3574 ceph_mdsc_put_request(nextreq); /* won't go away */
44ca18f2 3575 }
80fc7314 3576 req = nextreq;
2f2dc053
SW		 3577 }
3578 mutex_unlock(&mdsc->mutex);
3579 dout("wait_unsafe_requests done\n");
3580}
3581
3582void ceph_mdsc_sync(struct ceph_mds_client *mdsc)
3583{
affbc19a 3584 u64 want_tid, want_flush, want_snap;
2f2dc053 3585
48fec5d0 3586 if (ACCESS_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_SHUTDOWN)
56b7cf95
SW		 3587 return;
3588
2f2dc053
SW		 3589 dout("sync\n");
3590 mutex_lock(&mdsc->mutex);
3591 want_tid = mdsc->last_tid;
2f2dc053 3592 mutex_unlock(&mdsc->mutex);
2f2dc053 3593
afcdaea3 3594 ceph_flush_dirty_caps(mdsc);
d3383a8e 3595 spin_lock(&mdsc->cap_dirty_lock);
8310b089 3596 want_flush = mdsc->last_cap_flush_tid;
d3383a8e
YZ		 3597 spin_unlock(&mdsc->cap_dirty_lock);
3598
affbc19a
YZ		 3599 down_read(&mdsc->snap_rwsem);
3600 want_snap = mdsc->last_snap_seq;
3601 up_read(&mdsc->snap_rwsem);
3602
3603 dout("sync want tid %lld flush_seq %lld snap_seq %lld\n",
3604 want_tid, want_flush, want_snap);
2f2dc053
SW		 3605
3606 wait_unsafe_requests(mdsc, want_tid);
affbc19a 3607 wait_caps_flush(mdsc, want_flush, want_snap);
2f2dc053
SW		 3608}
3609
f3c60c59
SW		 3610/*
3611 * true if all sessions are closed, or we force unmount
3612 */
7fd7d101 3613static bool done_closing_sessions(struct ceph_mds_client *mdsc)
f3c60c59 3614{
48fec5d0 3615 if (ACCESS_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_SHUTDOWN)
f3c60c59 3616 return true;
86d8f67b 3617 return atomic_read(&mdsc->num_sessions) == 0;
f3c60c59 3618}
2f2dc053
SW		 3619
3620/*
3621 * called after sb is ro.
3622 */
3623void ceph_mdsc_close_sessions(struct ceph_mds_client *mdsc)
3624{
a319bf56 3625 struct ceph_options *opts = mdsc->fsc->client->options;
2f2dc053
SW		 3626 struct ceph_mds_session *session;
3627 int i;
2f2dc053
SW		 3628
3629 dout("close_sessions\n");
3630
2f2dc053 3631 /* close sessions */
f3c60c59
SW		 3632 mutex_lock(&mdsc->mutex);
3633 for (i = 0; i < mdsc->max_sessions; i++) {
3634 session = __ceph_lookup_mds_session(mdsc, i);
3635 if (!session)
3636 continue;
2f2dc053 3637 mutex_unlock(&mdsc->mutex);
f3c60c59
SW		 3638 mutex_lock(&session->s_mutex);
3639 __close_session(mdsc, session);
3640 mutex_unlock(&session->s_mutex);
3641 ceph_put_mds_session(session);
2f2dc053
SW		 3642 mutex_lock(&mdsc->mutex);
3643 }
f3c60c59
SW		 3644 mutex_unlock(&mdsc->mutex);
3645
3646 dout("waiting for sessions to close\n");
3647 wait_event_timeout(mdsc->session_close_wq, done_closing_sessions(mdsc),
a319bf56 3648 ceph_timeout_jiffies(opts->mount_timeout));
2f2dc053
SW		 3649
3650 /* tear down remaining sessions */
f3c60c59 3651 mutex_lock(&mdsc->mutex);
2f2dc053
SW		 3652 for (i = 0; i < mdsc->max_sessions; i++) {
3653 if (mdsc->sessions[i]) {
3654 session = get_session(mdsc->sessions[i]);
2600d2dd 3655 __unregister_session(mdsc, session);
2f2dc053
SW		 3656 mutex_unlock(&mdsc->mutex);
3657 mutex_lock(&session->s_mutex);
3658 remove_session_caps(session);
3659 mutex_unlock(&session->s_mutex);
3660 ceph_put_mds_session(session);
3661 mutex_lock(&mdsc->mutex);
3662 }
3663 }
2f2dc053 3664 WARN_ON(!list_empty(&mdsc->cap_delay_list));
2f2dc053
SW		 3665 mutex_unlock(&mdsc->mutex);
3666
3667 ceph_cleanup_empty_realms(mdsc);
3668
3669 cancel_delayed_work_sync(&mdsc->delayed_work); /* cancel timer */
3670
3671 dout("stopped\n");
3672}
3673
48fec5d0
YZ		 3674void ceph_mdsc_force_umount(struct ceph_mds_client *mdsc)
3675{
3676 struct ceph_mds_session *session;
3677 int mds;
3678
3679 dout("force umount\n");
3680
3681 mutex_lock(&mdsc->mutex);
3682 for (mds = 0; mds < mdsc->max_sessions; mds++) {
3683 session = __ceph_lookup_mds_session(mdsc, mds);
3684 if (!session)
3685 continue;
3686 mutex_unlock(&mdsc->mutex);
3687 mutex_lock(&session->s_mutex);
3688 __close_session(mdsc, session);
3689 if (session->s_state == CEPH_MDS_SESSION_CLOSING) {
3690 cleanup_session_requests(mdsc, session);
3691 remove_session_caps(session);
3692 }
3693 mutex_unlock(&session->s_mutex);
3694 ceph_put_mds_session(session);
3695 mutex_lock(&mdsc->mutex);
3696 kick_requests(mdsc, mds);
3697 }
3698 __wake_requests(mdsc, &mdsc->waiting_for_map);
3699 mutex_unlock(&mdsc->mutex);
3700}
3701
3d14c5d2 3702static void ceph_mdsc_stop(struct ceph_mds_client *mdsc)
2f2dc053
SW		 3703{
3704 dout("stop\n");
3705 cancel_delayed_work_sync(&mdsc->delayed_work); /* cancel timer */
3706 if (mdsc->mdsmap)
3707 ceph_mdsmap_destroy(mdsc->mdsmap);
3708 kfree(mdsc->sessions);
37151668 3709 ceph_caps_finalize(mdsc);
10183a69 3710 ceph_pool_perm_destroy(mdsc);
2f2dc053
SW		 3711}
3712
3d14c5d2
YS		 3713void ceph_mdsc_destroy(struct ceph_fs_client *fsc)
3714{
3715 struct ceph_mds_client *mdsc = fsc->mdsc;
3716
ef550f6f 3717 dout("mdsc_destroy %p\n", mdsc);
3d14c5d2 3718 ceph_mdsc_stop(mdsc);
ef550f6f
SW		 3719
3720 /* flush out any connection work with references to us */
3721 ceph_msgr_flush();
3722
3d14c5d2
YS		 3723 fsc->mdsc = NULL;
3724 kfree(mdsc);
ef550f6f 3725 dout("mdsc_destroy %p done\n", mdsc);
3d14c5d2
YS		 3726}
3727
2f2dc053
SW		 3728
3729/*
3730 * handle mds map update.
3731 */
3732void ceph_mdsc_handle_map(struct ceph_mds_client *mdsc, struct ceph_msg *msg)
3733{
3734 u32 epoch;
3735 u32 maplen;
3736 void *p = msg->front.iov_base;
3737 void *end = p + msg->front.iov_len;
3738 struct ceph_mdsmap *newmap, *oldmap;
3739 struct ceph_fsid fsid;
3740 int err = -EINVAL;
3741
3742 ceph_decode_need(&p, end, sizeof(fsid)+2*sizeof(u32), bad);
3743 ceph_decode_copy(&p, &fsid, sizeof(fsid));
3d14c5d2 3744 if (ceph_check_fsid(mdsc->fsc->client, &fsid) < 0)
0743304d 3745 return;
c89136ea
SW		 3746 epoch = ceph_decode_32(&p);
3747 maplen = ceph_decode_32(&p);
2f2dc053
SW		 3748 dout("handle_map epoch %u len %d\n", epoch, (int)maplen);
3749
3750 /* do we need it? */
2f2dc053
SW		 3751 mutex_lock(&mdsc->mutex);
3752 if (mdsc->mdsmap && epoch <= mdsc->mdsmap->m_epoch) {
3753 dout("handle_map epoch %u <= our %u\n",
3754 epoch, mdsc->mdsmap->m_epoch);
3755 mutex_unlock(&mdsc->mutex);
3756 return;
3757 }
3758
3759 newmap = ceph_mdsmap_decode(&p, end);
3760 if (IS_ERR(newmap)) {
3761 err = PTR_ERR(newmap);
3762 goto bad_unlock;
3763 }
3764
3765 /* swap into place */
3766 if (mdsc->mdsmap) {
3767 oldmap = mdsc->mdsmap;
3768 mdsc->mdsmap = newmap;
3769 check_new_map(mdsc, newmap, oldmap);
3770 ceph_mdsmap_destroy(oldmap);
3771 } else {
3772 mdsc->mdsmap = newmap; /* first mds map */
3773 }
3d14c5d2 3774 mdsc->fsc->sb->s_maxbytes = mdsc->mdsmap->m_max_file_size;
2f2dc053
SW		 3775
3776 __wake_requests(mdsc, &mdsc->waiting_for_map);
82dcabad
ID		 3777 ceph_monc_got_map(&mdsc->fsc->client->monc, CEPH_SUB_MDSMAP,
3778 mdsc->mdsmap->m_epoch);
2f2dc053
SW		 3779
3780 mutex_unlock(&mdsc->mutex);
3781 schedule_delayed(mdsc);
3782 return;
3783
3784bad_unlock:
3785 mutex_unlock(&mdsc->mutex);
3786bad:
3787 pr_err("error decoding mdsmap %d\n", err);
3788 return;
3789}
3790
3791static struct ceph_connection *con_get(struct ceph_connection *con)
3792{
3793 struct ceph_mds_session *s = con->private;
3794
3795 if (get_session(s)) {
2600d2dd 3796 dout("mdsc con_get %p ok (%d)\n", s, atomic_read(&s->s_ref));
2f2dc053
SW		 3797 return con;
3798 }
3799 dout("mdsc con_get %p FAIL\n", s);
3800 return NULL;
3801}
3802
3803static void con_put(struct ceph_connection *con)
3804{
3805 struct ceph_mds_session *s = con->private;
3806
7d8e18a6 3807 dout("mdsc con_put %p (%d)\n", s, atomic_read(&s->s_ref) - 1);
2f2dc053
SW		 3808 ceph_put_mds_session(s);
3809}
3810
3811/*
3812 * if the client is unresponsive for long enough, the mds will kill
3813 * the session entirely.
3814 */
3815static void peer_reset(struct ceph_connection *con)
3816{
3817 struct ceph_mds_session *s = con->private;
7e70f0ed 3818 struct ceph_mds_client *mdsc = s->s_mdsc;
2f2dc053 3819
f3ae1b97 3820 pr_warn("mds%d closed our session\n", s->s_mds);
7e70f0ed 3821 send_mds_reconnect(mdsc, s);
2f2dc053
SW		 3822}
3823
3824static void dispatch(struct ceph_connection *con, struct ceph_msg *msg)
3825{
3826 struct ceph_mds_session *s = con->private;
3827 struct ceph_mds_client *mdsc = s->s_mdsc;
3828 int type = le16_to_cpu(msg->hdr.type);
3829
2600d2dd
SW		 3830 mutex_lock(&mdsc->mutex);
3831 if (__verify_registered_session(mdsc, s) < 0) {
3832 mutex_unlock(&mdsc->mutex);
3833 goto out;
3834 }
3835 mutex_unlock(&mdsc->mutex);
3836
2f2dc053
SW		 3837 switch (type) {
3838 case CEPH_MSG_MDS_MAP:
3839 ceph_mdsc_handle_map(mdsc, msg);
3840 break;
3841 case CEPH_MSG_CLIENT_SESSION:
3842 handle_session(s, msg);
3843 break;
3844 case CEPH_MSG_CLIENT_REPLY:
3845 handle_reply(s, msg);
3846 break;
3847 case CEPH_MSG_CLIENT_REQUEST_FORWARD:
2600d2dd 3848 handle_forward(mdsc, s, msg);
2f2dc053
SW		 3849 break;
3850 case CEPH_MSG_CLIENT_CAPS:
3851 ceph_handle_caps(s, msg);
3852 break;
3853 case CEPH_MSG_CLIENT_SNAP:
2600d2dd 3854 ceph_handle_snap(mdsc, s, msg);
2f2dc053
SW		 3855 break;
3856 case CEPH_MSG_CLIENT_LEASE:
2600d2dd 3857 handle_lease(mdsc, s, msg);
2f2dc053
SW		 3858 break;
3859
3860 default:
3861 pr_err("received unknown message type %d %s\n", type,
3862 ceph_msg_type_name(type));
3863 }
2600d2dd 3864out:
2f2dc053
SW		 3865 ceph_msg_put(msg);
3866}
3867
4e7a5dcd
SW		 3868/*
3869 * authentication
3870 */
a3530df3
AE		 3871
3872/*
3873 * Note: returned pointer is the address of a structure that's
3874 * managed separately. Caller must *not* attempt to free it.
3875 */
3876static struct ceph_auth_handshake *get_authorizer(struct ceph_connection *con,
8f43fb53 3877 int *proto, int force_new)
4e7a5dcd
SW		 3878{
3879 struct ceph_mds_session *s = con->private;
3880 struct ceph_mds_client *mdsc = s->s_mdsc;
3d14c5d2 3881 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
74f1869f 3882 struct ceph_auth_handshake *auth = &s->s_auth;
4e7a5dcd 3883
74f1869f 3884 if (force_new && auth->authorizer) {
6c1ea260 3885 ceph_auth_destroy_authorizer(auth->authorizer);
74f1869f 3886 auth->authorizer = NULL;
4e7a5dcd 3887 }
27859f97
SW		 3888 if (!auth->authorizer) {
3889 int ret = ceph_auth_create_authorizer(ac, CEPH_ENTITY_TYPE_MDS,
3890 auth);
0bed9b5c
SW		 3891 if (ret)
3892 return ERR_PTR(ret);
27859f97
SW		 3893 } else {
3894 int ret = ceph_auth_update_authorizer(ac, CEPH_ENTITY_TYPE_MDS,
3895 auth);
a255651d 3896 if (ret)
a3530df3 3897 return ERR_PTR(ret);
4e7a5dcd 3898 }
4e7a5dcd 3899 *proto = ac->protocol;
74f1869f 3900
a3530df3 3901 return auth;
4e7a5dcd
SW		 3902}
3903
3904
3905static int verify_authorizer_reply(struct ceph_connection *con, int len)
3906{
3907 struct ceph_mds_session *s = con->private;
3908 struct ceph_mds_client *mdsc = s->s_mdsc;
3d14c5d2 3909 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
4e7a5dcd 3910
27859f97 3911 return ceph_auth_verify_authorizer_reply(ac, s->s_auth.authorizer, len);
4e7a5dcd
SW		 3912}
3913
9bd2e6f8
SW		 3914static int invalidate_authorizer(struct ceph_connection *con)
3915{
3916 struct ceph_mds_session *s = con->private;
3917 struct ceph_mds_client *mdsc = s->s_mdsc;
3d14c5d2 3918 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
9bd2e6f8 3919
27859f97 3920 ceph_auth_invalidate_authorizer(ac, CEPH_ENTITY_TYPE_MDS);
9bd2e6f8 3921
3d14c5d2 3922 return ceph_monc_validate_auth(&mdsc->fsc->client->monc);
9bd2e6f8
SW		 3923}
3924
53ded495
AE		 3925static struct ceph_msg *mds_alloc_msg(struct ceph_connection *con,
3926 struct ceph_msg_header *hdr, int *skip)
3927{
3928 struct ceph_msg *msg;
3929 int type = (int) le16_to_cpu(hdr->type);
3930 int front_len = (int) le32_to_cpu(hdr->front_len);
3931
3932 if (con->in_msg)
3933 return con->in_msg;
3934
3935 *skip = 0;
3936 msg = ceph_msg_new(type, front_len, GFP_NOFS, false);
3937 if (!msg) {
3938 pr_err("unable to allocate msg type %d len %d\n",
3939 type, front_len);
3940 return NULL;
3941 }
53ded495
AE		 3942
3943 return msg;
3944}
3945
79dbd1ba 3946static int mds_sign_message(struct ceph_msg *msg)
33d07337 3947{
79dbd1ba 3948 struct ceph_mds_session *s = msg->con->private;
33d07337 3949 struct ceph_auth_handshake *auth = &s->s_auth;
79dbd1ba 3950
33d07337
YZ		 3951 return ceph_auth_sign_message(auth, msg);
3952}
3953
79dbd1ba 3954static int mds_check_message_signature(struct ceph_msg *msg)
33d07337 3955{
79dbd1ba 3956 struct ceph_mds_session *s = msg->con->private;
33d07337 3957 struct ceph_auth_handshake *auth = &s->s_auth;
79dbd1ba 3958
33d07337
YZ		 3959 return ceph_auth_check_message_signature(auth, msg);
3960}
3961
9e32789f 3962static const struct ceph_connection_operations mds_con_ops = {
2f2dc053
SW		 3963 .get = con_get,
3964 .put = con_put,
3965 .dispatch = dispatch,
4e7a5dcd
SW		 3966 .get_authorizer = get_authorizer,
3967 .verify_authorizer_reply = verify_authorizer_reply,
9bd2e6f8 3968 .invalidate_authorizer = invalidate_authorizer,
2f2dc053 3969 .peer_reset = peer_reset,
53ded495 3970 .alloc_msg = mds_alloc_msg,
79dbd1ba
ID		 3971 .sign_message = mds_sign_message,
3972 .check_message_signature = mds_check_message_signature,
2f2dc053
SW		 3973};
3974
2f2dc053 3975/* eof */
Linux 6.x block layer and io_uring tree(s)