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ceph: define struct for dir entry in readdir reply
[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45 * are no longer valid.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
2a5beea3
YZ		 189 BUG_ON(!info->dir_entries);
190 if ((unsigned long)(info->dir_entries + num) >
191 (unsigned long)info->dir_entries + info->dir_buf_size) {
54008399
YZ		 192 pr_err("dir contents are larger than expected\n");
193 WARN_ON(1);
194 goto bad;
195 }
2f2dc053 196
54008399 197 info->dir_nr = num;
2f2dc053 198 while (num) {
2a5beea3 199 struct ceph_mds_reply_dir_entry *rde = info->dir_entries + i;
2f2dc053
SW		 200 /* dentry */
201 ceph_decode_need(p, end, sizeof(u32)*2, bad);
2a5beea3
YZ		 202 rde->name_len = ceph_decode_32(p);
203 ceph_decode_need(p, end, rde->name_len, bad);
204 rde->name = *p;
205 *p += rde->name_len;
206 dout("parsed dir dname '%.*s'\n", rde->name_len, rde->name);
207 rde->lease = *p;
2f2dc053
SW		 208 *p += sizeof(struct ceph_mds_reply_lease);
209
210 /* inode */
2a5beea3 211 err = parse_reply_info_in(p, end, &rde->inode, features);
2f2dc053
SW		 212 if (err < 0)
213 goto out_bad;
214 i++;
215 num--;
216 }
217
218done:
219 if (*p != end)
220 goto bad;
221 return 0;
222
223bad:
224 err = -EIO;
225out_bad:
226 pr_err("problem parsing dir contents %d\n", err);
227 return err;
228}
229
25933abd
HS		 230/*
231 * parse fcntl F_GETLK results
232 */
233static int parse_reply_info_filelock(void **p, void *end,
14303d20 234 struct ceph_mds_reply_info_parsed *info,
12b4629a 235 u64 features)
25933abd
HS		 236{
237 if (*p + sizeof(*info->filelock_reply) > end)
238 goto bad;
239
240 info->filelock_reply = *p;
241 *p += sizeof(*info->filelock_reply);
242
243 if (unlikely(*p != end))
244 goto bad;
245 return 0;
246
247bad:
248 return -EIO;
249}
250
6e8575fa
SL		 251/*
252 * parse create results
253 */
254static int parse_reply_info_create(void **p, void *end,
255 struct ceph_mds_reply_info_parsed *info,
12b4629a 256 u64 features)
6e8575fa
SL		 257{
258 if (features & CEPH_FEATURE_REPLY_CREATE_INODE) {
259 if (*p == end) {
260 info->has_create_ino = false;
261 } else {
262 info->has_create_ino = true;
263 info->ino = ceph_decode_64(p);
264 }
265 }
266
267 if (unlikely(*p != end))
268 goto bad;
269 return 0;
270
271bad:
272 return -EIO;
273}
274
25933abd
HS		 275/*
276 * parse extra results
277 */
278static int parse_reply_info_extra(void **p, void *end,
14303d20 279 struct ceph_mds_reply_info_parsed *info,
12b4629a 280 u64 features)
25933abd
HS		 281{
282 if (info->head->op == CEPH_MDS_OP_GETFILELOCK)
14303d20 283 return parse_reply_info_filelock(p, end, info, features);
8a034497
YZ		 284 else if (info->head->op == CEPH_MDS_OP_READDIR ||
285 info->head->op == CEPH_MDS_OP_LSSNAP)
14303d20 286 return parse_reply_info_dir(p, end, info, features);
6e8575fa
SL		 287 else if (info->head->op == CEPH_MDS_OP_CREATE)
288 return parse_reply_info_create(p, end, info, features);
289 else
290 return -EIO;
25933abd
HS		 291}
292
2f2dc053
SW		 293/*
294 * parse entire mds reply
295 */
296static int parse_reply_info(struct ceph_msg *msg,
14303d20 297 struct ceph_mds_reply_info_parsed *info,
12b4629a 298 u64 features)
2f2dc053
SW		 299{
300 void *p, *end;
301 u32 len;
302 int err;
303
304 info->head = msg->front.iov_base;
305 p = msg->front.iov_base + sizeof(struct ceph_mds_reply_head);
306 end = p + msg->front.iov_len - sizeof(struct ceph_mds_reply_head);
307
308 /* trace */
309 ceph_decode_32_safe(&p, end, len, bad);
310 if (len > 0) {
32852a81 311 ceph_decode_need(&p, end, len, bad);
14303d20 312 err = parse_reply_info_trace(&p, p+len, info, features);
2f2dc053
SW		 313 if (err < 0)
314 goto out_bad;
315 }
316
25933abd 317 /* extra */
2f2dc053
SW		 318 ceph_decode_32_safe(&p, end, len, bad);
319 if (len > 0) {
32852a81 320 ceph_decode_need(&p, end, len, bad);
14303d20 321 err = parse_reply_info_extra(&p, p+len, info, features);
2f2dc053
SW		 322 if (err < 0)
323 goto out_bad;
324 }
325
326 /* snap blob */
327 ceph_decode_32_safe(&p, end, len, bad);
328 info->snapblob_len = len;
329 info->snapblob = p;
330 p += len;
331
332 if (p != end)
333 goto bad;
334 return 0;
335
336bad:
337 err = -EIO;
338out_bad:
339 pr_err("mds parse_reply err %d\n", err);
340 return err;
341}
342
343static void destroy_reply_info(struct ceph_mds_reply_info_parsed *info)
344{
2a5beea3 345 if (!info->dir_entries)
54008399 346 return;
2a5beea3 347 free_pages((unsigned long)info->dir_entries, get_order(info->dir_buf_size));
2f2dc053
SW		 348}
349
350
351/*
352 * sessions
353 */
a687ecaf 354const char *ceph_session_state_name(int s)
2f2dc053
SW		 355{
356 switch (s) {
357 case CEPH_MDS_SESSION_NEW: return "new";
358 case CEPH_MDS_SESSION_OPENING: return "opening";
359 case CEPH_MDS_SESSION_OPEN: return "open";
360 case CEPH_MDS_SESSION_HUNG: return "hung";
361 case CEPH_MDS_SESSION_CLOSING: return "closing";
44ca18f2 362 case CEPH_MDS_SESSION_RESTARTING: return "restarting";
2f2dc053
SW		 363 case CEPH_MDS_SESSION_RECONNECTING: return "reconnecting";
364 default: return "???";
365 }
366}
367
368static struct ceph_mds_session *get_session(struct ceph_mds_session *s)
369{
370 if (atomic_inc_not_zero(&s->s_ref)) {
371 dout("mdsc get_session %p %d -> %d\n", s,
372 atomic_read(&s->s_ref)-1, atomic_read(&s->s_ref));
373 return s;
374 } else {
375 dout("mdsc get_session %p 0 -- FAIL", s);
376 return NULL;
377 }
378}
379
380void ceph_put_mds_session(struct ceph_mds_session *s)
381{
382 dout("mdsc put_session %p %d -> %d\n", s,
383 atomic_read(&s->s_ref), atomic_read(&s->s_ref)-1);
4e7a5dcd 384 if (atomic_dec_and_test(&s->s_ref)) {
6c4a1915 385 if (s->s_auth.authorizer)
6c1ea260 386 ceph_auth_destroy_authorizer(s->s_auth.authorizer);
2f2dc053 387 kfree(s);
4e7a5dcd 388 }
2f2dc053
SW		 389}
390
391/*
392 * called under mdsc->mutex
393 */
394struct ceph_mds_session *__ceph_lookup_mds_session(struct ceph_mds_client *mdsc,
395 int mds)
396{
397 struct ceph_mds_session *session;
398
399 if (mds >= mdsc->max_sessions || mdsc->sessions[mds] == NULL)
400 return NULL;
401 session = mdsc->sessions[mds];
402 dout("lookup_mds_session %p %d\n", session,
403 atomic_read(&session->s_ref));
404 get_session(session);
405 return session;
406}
407
408static bool __have_session(struct ceph_mds_client *mdsc, int mds)
409{
410 if (mds >= mdsc->max_sessions)
411 return false;
412 return mdsc->sessions[mds];
413}
414
2600d2dd
SW		 415static int __verify_registered_session(struct ceph_mds_client *mdsc,
416 struct ceph_mds_session *s)
417{
418 if (s->s_mds >= mdsc->max_sessions ||
419 mdsc->sessions[s->s_mds] != s)
420 return -ENOENT;
421 return 0;
422}
423
2f2dc053
SW		 424/*
425 * create+register a new session for given mds.
426 * called under mdsc->mutex.
427 */
428static struct ceph_mds_session *register_session(struct ceph_mds_client *mdsc,
429 int mds)
430{
431 struct ceph_mds_session *s;
432
c338c07c
NY		 433 if (mds >= mdsc->mdsmap->m_max_mds)
434 return ERR_PTR(-EINVAL);
435
2f2dc053 436 s = kzalloc(sizeof(*s), GFP_NOFS);
4736b009
DC		 437 if (!s)
438 return ERR_PTR(-ENOMEM);
2f2dc053
SW		 439 s->s_mdsc = mdsc;
440 s->s_mds = mds;
441 s->s_state = CEPH_MDS_SESSION_NEW;
442 s->s_ttl = 0;
443 s->s_seq = 0;
444 mutex_init(&s->s_mutex);
445
b7a9e5dd 446 ceph_con_init(&s->s_con, s, &mds_con_ops, &mdsc->fsc->client->msgr);
2f2dc053 447
d8fb02ab 448 spin_lock_init(&s->s_gen_ttl_lock);
2f2dc053 449 s->s_cap_gen = 0;
1ce208a6 450 s->s_cap_ttl = jiffies - 1;
d8fb02ab
AE		 451
452 spin_lock_init(&s->s_cap_lock);
2f2dc053
SW		 453 s->s_renew_requested = 0;
454 s->s_renew_seq = 0;
455 INIT_LIST_HEAD(&s->s_caps);
456 s->s_nr_caps = 0;
5dacf091 457 s->s_trim_caps = 0;
2f2dc053
SW		 458 atomic_set(&s->s_ref, 1);
459 INIT_LIST_HEAD(&s->s_waiting);
460 INIT_LIST_HEAD(&s->s_unsafe);
461 s->s_num_cap_releases = 0;
99a9c273 462 s->s_cap_reconnect = 0;
7c1332b8 463 s->s_cap_iterator = NULL;
2f2dc053 464 INIT_LIST_HEAD(&s->s_cap_releases);
2f2dc053
SW		 465 INIT_LIST_HEAD(&s->s_cap_flushing);
466 INIT_LIST_HEAD(&s->s_cap_snaps_flushing);
467
468 dout("register_session mds%d\n", mds);
469 if (mds >= mdsc->max_sessions) {
470 int newmax = 1 << get_count_order(mds+1);
471 struct ceph_mds_session **sa;
472
473 dout("register_session realloc to %d\n", newmax);
474 sa = kcalloc(newmax, sizeof(void *), GFP_NOFS);
475 if (sa == NULL)
42ce56e5 476 goto fail_realloc;
2f2dc053
SW		 477 if (mdsc->sessions) {
478 memcpy(sa, mdsc->sessions,
479 mdsc->max_sessions * sizeof(void *));
480 kfree(mdsc->sessions);
481 }
482 mdsc->sessions = sa;
483 mdsc->max_sessions = newmax;
484 }
485 mdsc->sessions[mds] = s;
86d8f67b 486 atomic_inc(&mdsc->num_sessions);
2f2dc053 487 atomic_inc(&s->s_ref); /* one ref to sessions[], one to caller */
42ce56e5 488
b7a9e5dd
SW		 489 ceph_con_open(&s->s_con, CEPH_ENTITY_TYPE_MDS, mds,
490 ceph_mdsmap_get_addr(mdsc->mdsmap, mds));
42ce56e5 491
2f2dc053 492 return s;
42ce56e5
SW		 493
494fail_realloc:
495 kfree(s);
496 return ERR_PTR(-ENOMEM);
2f2dc053
SW		 497}
498
499/*
500 * called under mdsc->mutex
501 */
2600d2dd 502static void __unregister_session(struct ceph_mds_client *mdsc,
42ce56e5 503 struct ceph_mds_session *s)
2f2dc053 504{
2600d2dd
SW		 505 dout("__unregister_session mds%d %p\n", s->s_mds, s);
506 BUG_ON(mdsc->sessions[s->s_mds] != s);
42ce56e5
SW		 507 mdsc->sessions[s->s_mds] = NULL;
508 ceph_con_close(&s->s_con);
509 ceph_put_mds_session(s);
86d8f67b 510 atomic_dec(&mdsc->num_sessions);
2f2dc053
SW		 511}
512
513/*
514 * drop session refs in request.
515 *
516 * should be last request ref, or hold mdsc->mutex
517 */
518static void put_request_session(struct ceph_mds_request *req)
519{
520 if (req->r_session) {
521 ceph_put_mds_session(req->r_session);
522 req->r_session = NULL;
523 }
524}
525
153c8e6b 526void ceph_mdsc_release_request(struct kref *kref)
2f2dc053 527{
153c8e6b
SW		 528 struct ceph_mds_request *req = container_of(kref,
529 struct ceph_mds_request,
530 r_kref);
54008399 531 destroy_reply_info(&req->r_reply_info);
153c8e6b
SW		 532 if (req->r_request)
533 ceph_msg_put(req->r_request);
54008399 534 if (req->r_reply)
153c8e6b 535 ceph_msg_put(req->r_reply);
153c8e6b 536 if (req->r_inode) {
41b02e1f 537 ceph_put_cap_refs(ceph_inode(req->r_inode), CEPH_CAP_PIN);
153c8e6b
SW		 538 iput(req->r_inode);
539 }
540 if (req->r_locked_dir)
41b02e1f 541 ceph_put_cap_refs(ceph_inode(req->r_locked_dir), CEPH_CAP_PIN);
e96a650a 542 iput(req->r_target_inode);
153c8e6b
SW		 543 if (req->r_dentry)
544 dput(req->r_dentry);
844d87c3
SW		 545 if (req->r_old_dentry)
546 dput(req->r_old_dentry);
547 if (req->r_old_dentry_dir) {
41b02e1f
SW		 548 /*
549 * track (and drop pins for) r_old_dentry_dir
550 * separately, since r_old_dentry's d_parent may have
551 * changed between the dir mutex being dropped and
552 * this request being freed.
553 */
554 ceph_put_cap_refs(ceph_inode(req->r_old_dentry_dir),
555 CEPH_CAP_PIN);
41b02e1f 556 iput(req->r_old_dentry_dir);
2f2dc053 557 }
153c8e6b
SW		 558 kfree(req->r_path1);
559 kfree(req->r_path2);
25e6bae3
YZ		 560 if (req->r_pagelist)
561 ceph_pagelist_release(req->r_pagelist);
153c8e6b 562 put_request_session(req);
37151668 563 ceph_unreserve_caps(req->r_mdsc, &req->r_caps_reservation);
153c8e6b 564 kfree(req);
2f2dc053
SW		 565}
566
fcd00b68
ID		 567DEFINE_RB_FUNCS(request, struct ceph_mds_request, r_tid, r_node)
568
2f2dc053
SW		 569/*
570 * lookup session, bump ref if found.
571 *
572 * called under mdsc->mutex.
573 */
fcd00b68
ID		 574static struct ceph_mds_request *
575lookup_get_request(struct ceph_mds_client *mdsc, u64 tid)
2f2dc053
SW		 576{
577 struct ceph_mds_request *req;
44ca18f2 578
fcd00b68
ID		 579 req = lookup_request(&mdsc->request_tree, tid);
580 if (req)
581 ceph_mdsc_get_request(req);
44ca18f2 582
fcd00b68 583 return req;
2f2dc053
SW		 584}
585
586/*
587 * Register an in-flight request, and assign a tid. Link to directory
588 * are modifying (if any).
589 *
590 * Called under mdsc->mutex.
591 */
592static void __register_request(struct ceph_mds_client *mdsc,
593 struct ceph_mds_request *req,
594 struct inode *dir)
595{
596 req->r_tid = ++mdsc->last_tid;
597 if (req->r_num_caps)
37151668
YS		 598 ceph_reserve_caps(mdsc, &req->r_caps_reservation,
599 req->r_num_caps);
2f2dc053
SW		 600 dout("__register_request %p tid %lld\n", req, req->r_tid);
601 ceph_mdsc_get_request(req);
fcd00b68 602 insert_request(&mdsc->request_tree, req);
2f2dc053 603
cb4276cc
SW		 604 req->r_uid = current_fsuid();
605 req->r_gid = current_fsgid();
606
e8a7b8b1
YZ		 607 if (mdsc->oldest_tid == 0 && req->r_op != CEPH_MDS_OP_SETFILELOCK)
608 mdsc->oldest_tid = req->r_tid;
609
2f2dc053 610 if (dir) {
3b663780 611 ihold(dir);
2f2dc053 612 req->r_unsafe_dir = dir;
2f2dc053
SW		 613 }
614}
615
616static void __unregister_request(struct ceph_mds_client *mdsc,
617 struct ceph_mds_request *req)
618{
619 dout("__unregister_request %p tid %lld\n", req, req->r_tid);
e8a7b8b1
YZ		 620
621 if (req->r_tid == mdsc->oldest_tid) {
622 struct rb_node *p = rb_next(&req->r_node);
623 mdsc->oldest_tid = 0;
624 while (p) {
625 struct ceph_mds_request *next_req =
626 rb_entry(p, struct ceph_mds_request, r_node);
627 if (next_req->r_op != CEPH_MDS_OP_SETFILELOCK) {
628 mdsc->oldest_tid = next_req->r_tid;
629 break;
630 }
631 p = rb_next(p);
632 }
633 }
634
fcd00b68 635 erase_request(&mdsc->request_tree, req);
2f2dc053 636
4c06ace8 637 if (req->r_unsafe_dir && req->r_got_unsafe) {
2f2dc053 638 struct ceph_inode_info *ci = ceph_inode(req->r_unsafe_dir);
2f2dc053
SW		 639 spin_lock(&ci->i_unsafe_lock);
640 list_del_init(&req->r_unsafe_dir_item);
641 spin_unlock(&ci->i_unsafe_lock);
4c06ace8 642 }
68cd5b4b
YZ		 643 if (req->r_target_inode && req->r_got_unsafe) {
644 struct ceph_inode_info *ci = ceph_inode(req->r_target_inode);
645 spin_lock(&ci->i_unsafe_lock);
646 list_del_init(&req->r_unsafe_target_item);
647 spin_unlock(&ci->i_unsafe_lock);
648 }
3b663780 649
4c06ace8 650 if (req->r_unsafe_dir) {
3b663780
SW		 651 iput(req->r_unsafe_dir);
652 req->r_unsafe_dir = NULL;
2f2dc053 653 }
94aa8ae1 654
fc55d2c9
YZ		 655 complete_all(&req->r_safe_completion);
656
94aa8ae1 657 ceph_mdsc_put_request(req);
2f2dc053
SW		 658}
659
660/*
661 * Choose mds to send request to next. If there is a hint set in the
662 * request (e.g., due to a prior forward hint from the mds), use that.
663 * Otherwise, consult frag tree and/or caps to identify the
664 * appropriate mds. If all else fails, choose randomly.
665 *
666 * Called under mdsc->mutex.
667 */
7fd7d101 668static struct dentry *get_nonsnap_parent(struct dentry *dentry)
eb6bb1c5 669{
d79698da
SW		 670 /*
671 * we don't need to worry about protecting the d_parent access
672 * here because we never renaming inside the snapped namespace
673 * except to resplice to another snapdir, and either the old or new
674 * result is a valid result.
675 */
2b0143b5 676 while (!IS_ROOT(dentry) && ceph_snap(d_inode(dentry)) != CEPH_NOSNAP)
eb6bb1c5
SW		 677 dentry = dentry->d_parent;
678 return dentry;
679}
680
2f2dc053
SW		 681static int __choose_mds(struct ceph_mds_client *mdsc,
682 struct ceph_mds_request *req)
683{
684 struct inode *inode;
685 struct ceph_inode_info *ci;
686 struct ceph_cap *cap;
687 int mode = req->r_direct_mode;
688 int mds = -1;
689 u32 hash = req->r_direct_hash;
690 bool is_hash = req->r_direct_is_hash;
691
692 /*
693 * is there a specific mds we should try? ignore hint if we have
694 * no session and the mds is not up (active or recovering).
695 */
696 if (req->r_resend_mds >= 0 &&
697 (__have_session(mdsc, req->r_resend_mds) ||
698 ceph_mdsmap_get_state(mdsc->mdsmap, req->r_resend_mds) > 0)) {
699 dout("choose_mds using resend_mds mds%d\n",
700 req->r_resend_mds);
701 return req->r_resend_mds;
702 }
703
704 if (mode == USE_RANDOM_MDS)
705 goto random;
706
707 inode = NULL;
708 if (req->r_inode) {
709 inode = req->r_inode;
710 } else if (req->r_dentry) {
d79698da
SW		 711 /* ignore race with rename; old or new d_parent is okay */
712 struct dentry *parent = req->r_dentry->d_parent;
2b0143b5 713 struct inode *dir = d_inode(parent);
eb6bb1c5 714
3d14c5d2 715 if (dir->i_sb != mdsc->fsc->sb) {
eb6bb1c5 716 /* not this fs! */
2b0143b5 717 inode = d_inode(req->r_dentry);
eb6bb1c5
SW		 718 } else if (ceph_snap(dir) != CEPH_NOSNAP) {
719 /* direct snapped/virtual snapdir requests
720 * based on parent dir inode */
d79698da 721 struct dentry *dn = get_nonsnap_parent(parent);
2b0143b5 722 inode = d_inode(dn);
eb6bb1c5 723 dout("__choose_mds using nonsnap parent %p\n", inode);
ca18bede 724 } else {
eb6bb1c5 725 /* dentry target */
2b0143b5 726 inode = d_inode(req->r_dentry);
ca18bede
YZ		 727 if (!inode || mode == USE_AUTH_MDS) {
728 /* dir + name */
729 inode = dir;
730 hash = ceph_dentry_hash(dir, req->r_dentry);
731 is_hash = true;
732 }
2f2dc053
SW		 733 }
734 }
eb6bb1c5 735
2f2dc053
SW		 736 dout("__choose_mds %p is_hash=%d (%d) mode %d\n", inode, (int)is_hash,
737 (int)hash, mode);
738 if (!inode)
739 goto random;
740 ci = ceph_inode(inode);
741
742 if (is_hash && S_ISDIR(inode->i_mode)) {
743 struct ceph_inode_frag frag;
744 int found;
745
746 ceph_choose_frag(ci, hash, &frag, &found);
747 if (found) {
748 if (mode == USE_ANY_MDS && frag.ndist > 0) {
749 u8 r;
750
751 /* choose a random replica */
752 get_random_bytes(&r, 1);
753 r %= frag.ndist;
754 mds = frag.dist[r];
755 dout("choose_mds %p %llx.%llx "
756 "frag %u mds%d (%d/%d)\n",
757 inode, ceph_vinop(inode),
d66bbd44 758 frag.frag, mds,
2f2dc053 759 (int)r, frag.ndist);
d66bbd44
SW		 760 if (ceph_mdsmap_get_state(mdsc->mdsmap, mds) >=
761 CEPH_MDS_STATE_ACTIVE)
762 return mds;
2f2dc053
SW		 763 }
764
765 /* since this file/dir wasn't known to be
766 * replicated, then we want to look for the
767 * authoritative mds. */
768 mode = USE_AUTH_MDS;
769 if (frag.mds >= 0) {
770 /* choose auth mds */
771 mds = frag.mds;
772 dout("choose_mds %p %llx.%llx "
773 "frag %u mds%d (auth)\n",
774 inode, ceph_vinop(inode), frag.frag, mds);
d66bbd44
SW		 775 if (ceph_mdsmap_get_state(mdsc->mdsmap, mds) >=
776 CEPH_MDS_STATE_ACTIVE)
777 return mds;
2f2dc053
SW		 778 }
779 }
780 }
781
be655596 782 spin_lock(&ci->i_ceph_lock);
2f2dc053
SW		 783 cap = NULL;
784 if (mode == USE_AUTH_MDS)
785 cap = ci->i_auth_cap;
786 if (!cap && !RB_EMPTY_ROOT(&ci->i_caps))
787 cap = rb_entry(rb_first(&ci->i_caps), struct ceph_cap, ci_node);
788 if (!cap) {
be655596 789 spin_unlock(&ci->i_ceph_lock);
2f2dc053
SW		 790 goto random;
791 }
792 mds = cap->session->s_mds;
793 dout("choose_mds %p %llx.%llx mds%d (%scap %p)\n",
794 inode, ceph_vinop(inode), mds,
795 cap == ci->i_auth_cap ? "auth " : "", cap);
be655596 796 spin_unlock(&ci->i_ceph_lock);
2f2dc053
SW		 797 return mds;
798
799random:
800 mds = ceph_mdsmap_get_random_mds(mdsc->mdsmap);
801 dout("choose_mds chose random mds%d\n", mds);
802 return mds;
803}
804
805
806/*
807 * session messages
808 */
809static struct ceph_msg *create_session_msg(u32 op, u64 seq)
810{
811 struct ceph_msg *msg;
812 struct ceph_mds_session_head *h;
813
b61c2763
SW		 814 msg = ceph_msg_new(CEPH_MSG_CLIENT_SESSION, sizeof(*h), GFP_NOFS,
815 false);
a79832f2 816 if (!msg) {
2f2dc053 817 pr_err("create_session_msg ENOMEM creating msg\n");
a79832f2 818 return NULL;
2f2dc053
SW		 819 }
820 h = msg->front.iov_base;
821 h->op = cpu_to_le32(op);
822 h->seq = cpu_to_le64(seq);
dbd0c8bf
JS		 823
824 return msg;
825}
826
827/*
828 * session message, specialization for CEPH_SESSION_REQUEST_OPEN
829 * to include additional client metadata fields.
830 */
831static struct ceph_msg *create_session_open_msg(struct ceph_mds_client *mdsc, u64 seq)
832{
833 struct ceph_msg *msg;
834 struct ceph_mds_session_head *h;
835 int i = -1;
836 int metadata_bytes = 0;
837 int metadata_key_count = 0;
838 struct ceph_options *opt = mdsc->fsc->client->options;
3f384954 839 struct ceph_mount_options *fsopt = mdsc->fsc->mount_options;
dbd0c8bf
JS		 840 void *p;
841
a6a5ce4f 842 const char* metadata[][2] = {
dbd0c8bf 843 {"hostname", utsname()->nodename},
a6a5ce4f 844 {"kernel_version", utsname()->release},
3f384954
YZ		 845 {"entity_id", opt->name ? : ""},
846 {"root", fsopt->server_path ? : "/"},
dbd0c8bf
JS		 847 {NULL, NULL}
848 };
849
850 /* Calculate serialized length of metadata */
851 metadata_bytes = 4; /* map length */
852 for (i = 0; metadata[i][0] != NULL; ++i) {
853 metadata_bytes += 8 + strlen(metadata[i][0]) +
854 strlen(metadata[i][1]);
855 metadata_key_count++;
856 }
857
858 /* Allocate the message */
859 msg = ceph_msg_new(CEPH_MSG_CLIENT_SESSION, sizeof(*h) + metadata_bytes,
860 GFP_NOFS, false);
861 if (!msg) {
862 pr_err("create_session_msg ENOMEM creating msg\n");
863 return NULL;
864 }
865 h = msg->front.iov_base;
866 h->op = cpu_to_le32(CEPH_SESSION_REQUEST_OPEN);
867 h->seq = cpu_to_le64(seq);
868
869 /*
870 * Serialize client metadata into waiting buffer space, using
871 * the format that userspace expects for map<string, string>
7cfa0313
JS		 872 *
873 * ClientSession messages with metadata are v2
dbd0c8bf 874 */
7cfa0313
JS		 875 msg->hdr.version = cpu_to_le16(2);
876 msg->hdr.compat_version = cpu_to_le16(1);
dbd0c8bf
JS		 877
878 /* The write pointer, following the session_head structure */
879 p = msg->front.iov_base + sizeof(*h);
880
881 /* Number of entries in the map */
882 ceph_encode_32(&p, metadata_key_count);
883
884 /* Two length-prefixed strings for each entry in the map */
885 for (i = 0; metadata[i][0] != NULL; ++i) {
886 size_t const key_len = strlen(metadata[i][0]);
887 size_t const val_len = strlen(metadata[i][1]);
888
889 ceph_encode_32(&p, key_len);
890 memcpy(p, metadata[i][0], key_len);
891 p += key_len;
892 ceph_encode_32(&p, val_len);
893 memcpy(p, metadata[i][1], val_len);
894 p += val_len;
895 }
896
2f2dc053
SW		 897 return msg;
898}
899
900/*
901 * send session open request.
902 *
903 * called under mdsc->mutex
904 */
905static int __open_session(struct ceph_mds_client *mdsc,
906 struct ceph_mds_session *session)
907{
908 struct ceph_msg *msg;
909 int mstate;
910 int mds = session->s_mds;
2f2dc053
SW		 911
912 /* wait for mds to go active? */
913 mstate = ceph_mdsmap_get_state(mdsc->mdsmap, mds);
914 dout("open_session to mds%d (%s)\n", mds,
915 ceph_mds_state_name(mstate));
916 session->s_state = CEPH_MDS_SESSION_OPENING;
917 session->s_renew_requested = jiffies;
918
919 /* send connect message */
dbd0c8bf 920 msg = create_session_open_msg(mdsc, session->s_seq);
a79832f2
SW		 921 if (!msg)
922 return -ENOMEM;
2f2dc053 923 ceph_con_send(&session->s_con, msg);
2f2dc053
SW		 924 return 0;
925}
926
ed0552a1
SW		 927/*
928 * open sessions for any export targets for the given mds
929 *
930 * called under mdsc->mutex
931 */
5d72d13c
YZ		 932static struct ceph_mds_session *
933__open_export_target_session(struct ceph_mds_client *mdsc, int target)
934{
935 struct ceph_mds_session *session;
936
937 session = __ceph_lookup_mds_session(mdsc, target);
938 if (!session) {
939 session = register_session(mdsc, target);
940 if (IS_ERR(session))
941 return session;
942 }
943 if (session->s_state == CEPH_MDS_SESSION_NEW ||
944 session->s_state == CEPH_MDS_SESSION_CLOSING)
945 __open_session(mdsc, session);
946
947 return session;
948}
949
950struct ceph_mds_session *
951ceph_mdsc_open_export_target_session(struct ceph_mds_client *mdsc, int target)
952{
953 struct ceph_mds_session *session;
954
955 dout("open_export_target_session to mds%d\n", target);
956
957 mutex_lock(&mdsc->mutex);
958 session = __open_export_target_session(mdsc, target);
959 mutex_unlock(&mdsc->mutex);
960
961 return session;
962}
963
ed0552a1
SW		 964static void __open_export_target_sessions(struct ceph_mds_client *mdsc,
965 struct ceph_mds_session *session)
966{
967 struct ceph_mds_info *mi;
968 struct ceph_mds_session *ts;
969 int i, mds = session->s_mds;
ed0552a1
SW		 970
971 if (mds >= mdsc->mdsmap->m_max_mds)
972 return;
5d72d13c 973
ed0552a1
SW		 974 mi = &mdsc->mdsmap->m_info[mds];
975 dout("open_export_target_sessions for mds%d (%d targets)\n",
976 session->s_mds, mi->num_export_targets);
977
978 for (i = 0; i < mi->num_export_targets; i++) {
5d72d13c
YZ		 979 ts = __open_export_target_session(mdsc, mi->export_targets[i]);
980 if (!IS_ERR(ts))
981 ceph_put_mds_session(ts);
ed0552a1
SW		 982 }
983}
984
154f42c2
SW		 985void ceph_mdsc_open_export_target_sessions(struct ceph_mds_client *mdsc,
986 struct ceph_mds_session *session)
987{
988 mutex_lock(&mdsc->mutex);
989 __open_export_target_sessions(mdsc, session);
990 mutex_unlock(&mdsc->mutex);
991}
992
2f2dc053
SW		 993/*
994 * session caps
995 */
996
745a8e3b
YZ		 997/* caller holds s_cap_lock, we drop it */
998static void cleanup_cap_releases(struct ceph_mds_client *mdsc,
999 struct ceph_mds_session *session)
1000 __releases(session->s_cap_lock)
2f2dc053 1001{
745a8e3b
YZ		 1002 LIST_HEAD(tmp_list);
1003 list_splice_init(&session->s_cap_releases, &tmp_list);
1004 session->s_num_cap_releases = 0;
1005 spin_unlock(&session->s_cap_lock);
2f2dc053 1006
745a8e3b
YZ		 1007 dout("cleanup_cap_releases mds%d\n", session->s_mds);
1008 while (!list_empty(&tmp_list)) {
1009 struct ceph_cap *cap;
1010 /* zero out the in-progress message */
1011 cap = list_first_entry(&tmp_list,
1012 struct ceph_cap, session_caps);
1013 list_del(&cap->session_caps);
1014 ceph_put_cap(mdsc, cap);
2f2dc053 1015 }
2f2dc053
SW		 1016}
1017
1c841a96
YZ		 1018static void cleanup_session_requests(struct ceph_mds_client *mdsc,
1019 struct ceph_mds_session *session)
1020{
1021 struct ceph_mds_request *req;
1022 struct rb_node *p;
1023
1024 dout("cleanup_session_requests mds%d\n", session->s_mds);
1025 mutex_lock(&mdsc->mutex);
1026 while (!list_empty(&session->s_unsafe)) {
1027 req = list_first_entry(&session->s_unsafe,
1028 struct ceph_mds_request, r_unsafe_item);
1029 list_del_init(&req->r_unsafe_item);
3e0708b9
YZ		 1030 pr_warn_ratelimited(" dropping unsafe request %llu\n",
1031 req->r_tid);
1c841a96
YZ		 1032 __unregister_request(mdsc, req);
1033 }
1034 /* zero r_attempts, so kick_requests() will re-send requests */
1035 p = rb_first(&mdsc->request_tree);
1036 while (p) {
1037 req = rb_entry(p, struct ceph_mds_request, r_node);
1038 p = rb_next(p);
1039 if (req->r_session &&
1040 req->r_session->s_mds == session->s_mds)
1041 req->r_attempts = 0;
1042 }
1043 mutex_unlock(&mdsc->mutex);
1044}
1045
2f2dc053 1046/*
f818a736
SW		 1047 * Helper to safely iterate over all caps associated with a session, with
1048 * special care taken to handle a racing __ceph_remove_cap().
2f2dc053 1049 *
f818a736 1050 * Caller must hold session s_mutex.
2f2dc053
SW		 1051 */
1052static int iterate_session_caps(struct ceph_mds_session *session,
1053 int (*cb)(struct inode *, struct ceph_cap *,
1054 void *), void *arg)
1055{
7c1332b8
SW		 1056 struct list_head *p;
1057 struct ceph_cap *cap;
1058 struct inode *inode, *last_inode = NULL;
1059 struct ceph_cap *old_cap = NULL;
2f2dc053
SW		 1060 int ret;
1061
1062 dout("iterate_session_caps %p mds%d\n", session, session->s_mds);
1063 spin_lock(&session->s_cap_lock);
7c1332b8
SW		 1064 p = session->s_caps.next;
1065 while (p != &session->s_caps) {
1066 cap = list_entry(p, struct ceph_cap, session_caps);
2f2dc053 1067 inode = igrab(&cap->ci->vfs_inode);
7c1332b8
SW		 1068 if (!inode) {
1069 p = p->next;
2f2dc053 1070 continue;
7c1332b8
SW		 1071 }
1072 session->s_cap_iterator = cap;
2f2dc053 1073 spin_unlock(&session->s_cap_lock);
7c1332b8
SW		 1074
1075 if (last_inode) {
1076 iput(last_inode);
1077 last_inode = NULL;
1078 }
1079 if (old_cap) {
37151668 1080 ceph_put_cap(session->s_mdsc, old_cap);
7c1332b8
SW		 1081 old_cap = NULL;
1082 }
1083
2f2dc053 1084 ret = cb(inode, cap, arg);
7c1332b8
SW		 1085 last_inode = inode;
1086
2f2dc053 1087 spin_lock(&session->s_cap_lock);
7c1332b8
SW		 1088 p = p->next;
1089 if (cap->ci == NULL) {
1090 dout("iterate_session_caps finishing cap %p removal\n",
1091 cap);
1092 BUG_ON(cap->session != session);
745a8e3b 1093 cap->session = NULL;
7c1332b8
SW		 1094 list_del_init(&cap->session_caps);
1095 session->s_nr_caps--;
745a8e3b
YZ		 1096 if (cap->queue_release) {
1097 list_add_tail(&cap->session_caps,
1098 &session->s_cap_releases);
1099 session->s_num_cap_releases++;
1100 } else {
1101 old_cap = cap; /* put_cap it w/o locks held */
1102 }
7c1332b8 1103 }
5dacf091
SW		 1104 if (ret < 0)
1105 goto out;
2f2dc053 1106 }
5dacf091
SW		 1107 ret = 0;
1108out:
7c1332b8 1109 session->s_cap_iterator = NULL;
2f2dc053 1110 spin_unlock(&session->s_cap_lock);
7c1332b8 1111
e96a650a 1112 iput(last_inode);
7c1332b8 1113 if (old_cap)
37151668 1114 ceph_put_cap(session->s_mdsc, old_cap);
7c1332b8 1115
5dacf091 1116 return ret;
2f2dc053
SW		 1117}
1118
1119static int remove_session_caps_cb(struct inode *inode, struct ceph_cap *cap,
6c99f254 1120 void *arg)
2f2dc053 1121{
6c93df5d 1122 struct ceph_fs_client *fsc = (struct ceph_fs_client *)arg;
2f2dc053 1123 struct ceph_inode_info *ci = ceph_inode(inode);
553adfd9 1124 LIST_HEAD(to_remove);
6c93df5d
YZ		 1125 bool drop = false;
1126 bool invalidate = false;
6c99f254 1127
2f2dc053
SW		 1128 dout("removing cap %p, ci is %p, inode is %p\n",
1129 cap, ci, &ci->vfs_inode);
be655596 1130 spin_lock(&ci->i_ceph_lock);
a096b09a 1131 __ceph_remove_cap(cap, false);
571ade33 1132 if (!ci->i_auth_cap) {
553adfd9 1133 struct ceph_cap_flush *cf;
6c93df5d 1134 struct ceph_mds_client *mdsc = fsc->mdsc;
6c99f254 1135
77310320
YZ		 1136 ci->i_ceph_flags |= CEPH_I_CAP_DROPPED;
1137
6c93df5d
YZ		 1138 if (ci->i_wrbuffer_ref > 0 &&
1139 ACCESS_ONCE(fsc->mount_state) == CEPH_MOUNT_SHUTDOWN)
1140 invalidate = true;
1141
553adfd9
YZ		 1142 while (true) {
1143 struct rb_node *n = rb_first(&ci->i_cap_flush_tree);
1144 if (!n)
1145 break;
1146 cf = rb_entry(n, struct ceph_cap_flush, i_node);
1147 rb_erase(&cf->i_node, &ci->i_cap_flush_tree);
1148 list_add(&cf->list, &to_remove);
1149 }
1150
6c99f254 1151 spin_lock(&mdsc->cap_dirty_lock);
8310b089
YZ		 1152
1153 list_for_each_entry(cf, &to_remove, list)
1154 rb_erase(&cf->g_node, &mdsc->cap_flush_tree);
1155
6c99f254 1156 if (!list_empty(&ci->i_dirty_item)) {
3e0708b9
YZ		 1157 pr_warn_ratelimited(
1158 " dropping dirty %s state for %p %lld\n",
6c99f254
SW		 1159 ceph_cap_string(ci->i_dirty_caps),
1160 inode, ceph_ino(inode));
1161 ci->i_dirty_caps = 0;
1162 list_del_init(&ci->i_dirty_item);
6c93df5d 1163 drop = true;
6c99f254
SW		 1164 }
1165 if (!list_empty(&ci->i_flushing_item)) {
3e0708b9
YZ		 1166 pr_warn_ratelimited(
1167 " dropping dirty+flushing %s state for %p %lld\n",
6c99f254
SW		 1168 ceph_cap_string(ci->i_flushing_caps),
1169 inode, ceph_ino(inode));
1170 ci->i_flushing_caps = 0;
1171 list_del_init(&ci->i_flushing_item);
1172 mdsc->num_cap_flushing--;
6c93df5d 1173 drop = true;
6c99f254 1174 }
6c99f254 1175 spin_unlock(&mdsc->cap_dirty_lock);
553adfd9 1176
f66fd9f0
YZ		 1177 if (!ci->i_dirty_caps && ci->i_prealloc_cap_flush) {
1178 list_add(&ci->i_prealloc_cap_flush->list, &to_remove);
1179 ci->i_prealloc_cap_flush = NULL;
1180 }
6c99f254 1181 }
be655596 1182 spin_unlock(&ci->i_ceph_lock);
553adfd9
YZ		 1183 while (!list_empty(&to_remove)) {
1184 struct ceph_cap_flush *cf;
1185 cf = list_first_entry(&to_remove,
1186 struct ceph_cap_flush, list);
1187 list_del(&cf->list);
f66fd9f0 1188 ceph_free_cap_flush(cf);
553adfd9 1189 }
77310320
YZ		 1190
1191 wake_up_all(&ci->i_cap_wq);
6c93df5d
YZ		 1192 if (invalidate)
1193 ceph_queue_invalidate(inode);
77310320 1194 if (drop)
6c99f254 1195 iput(inode);
2f2dc053
SW		 1196 return 0;
1197}
1198
1199/*
1200 * caller must hold session s_mutex
1201 */
1202static void remove_session_caps(struct ceph_mds_session *session)
1203{
6c93df5d
YZ		 1204 struct ceph_fs_client *fsc = session->s_mdsc->fsc;
1205 struct super_block *sb = fsc->sb;
2f2dc053 1206 dout("remove_session_caps on %p\n", session);
6c93df5d 1207 iterate_session_caps(session, remove_session_caps_cb, fsc);
6f60f889
YZ		 1208
1209 spin_lock(&session->s_cap_lock);
1210 if (session->s_nr_caps > 0) {
6f60f889
YZ		 1211 struct inode *inode;
1212 struct ceph_cap *cap, *prev = NULL;
1213 struct ceph_vino vino;
1214 /*
1215 * iterate_session_caps() skips inodes that are being
1216 * deleted, we need to wait until deletions are complete.
1217 * __wait_on_freeing_inode() is designed for the job,
1218 * but it is not exported, so use lookup inode function
1219 * to access it.
1220 */
1221 while (!list_empty(&session->s_caps)) {
1222 cap = list_entry(session->s_caps.next,
1223 struct ceph_cap, session_caps);
1224 if (cap == prev)
1225 break;
1226 prev = cap;
1227 vino = cap->ci->i_vino;
1228 spin_unlock(&session->s_cap_lock);
1229
ed284c49 1230 inode = ceph_find_inode(sb, vino);
6f60f889
YZ		 1231 iput(inode);
1232
1233 spin_lock(&session->s_cap_lock);
1234 }
1235 }
745a8e3b
YZ		 1236
1237 // drop cap expires and unlock s_cap_lock
1238 cleanup_cap_releases(session->s_mdsc, session);
6f60f889 1239
2f2dc053 1240 BUG_ON(session->s_nr_caps > 0);
6c99f254 1241 BUG_ON(!list_empty(&session->s_cap_flushing));
2f2dc053
SW		 1242}
1243
1244/*
1245 * wake up any threads waiting on this session's caps. if the cap is
1246 * old (didn't get renewed on the client reconnect), remove it now.
1247 *
1248 * caller must hold s_mutex.
1249 */
1250static int wake_up_session_cb(struct inode *inode, struct ceph_cap *cap,
1251 void *arg)
1252{
0dc2570f
SW		 1253 struct ceph_inode_info *ci = ceph_inode(inode);
1254
03066f23 1255 wake_up_all(&ci->i_cap_wq);
0dc2570f 1256 if (arg) {
be655596 1257 spin_lock(&ci->i_ceph_lock);
0dc2570f
SW		 1258 ci->i_wanted_max_size = 0;
1259 ci->i_requested_max_size = 0;
be655596 1260 spin_unlock(&ci->i_ceph_lock);
0dc2570f 1261 }
2f2dc053
SW		 1262 return 0;
1263}
1264
0dc2570f
SW		 1265static void wake_up_session_caps(struct ceph_mds_session *session,
1266 int reconnect)
2f2dc053
SW		 1267{
1268 dout("wake_up_session_caps %p mds%d\n", session, session->s_mds);
0dc2570f
SW		 1269 iterate_session_caps(session, wake_up_session_cb,
1270 (void *)(unsigned long)reconnect);
2f2dc053
SW		 1271}
1272
1273/*
1274 * Send periodic message to MDS renewing all currently held caps. The
1275 * ack will reset the expiration for all caps from this session.
1276 *
1277 * caller holds s_mutex
1278 */
1279static int send_renew_caps(struct ceph_mds_client *mdsc,
1280 struct ceph_mds_session *session)
1281{
1282 struct ceph_msg *msg;
1283 int state;
1284
1285 if (time_after_eq(jiffies, session->s_cap_ttl) &&
1286 time_after_eq(session->s_cap_ttl, session->s_renew_requested))
1287 pr_info("mds%d caps stale\n", session->s_mds);
e4cb4cb8 1288 session->s_renew_requested = jiffies;
2f2dc053
SW		 1289
1290 /* do not try to renew caps until a recovering mds has reconnected
1291 * with its clients. */
1292 state = ceph_mdsmap_get_state(mdsc->mdsmap, session->s_mds);
1293 if (state < CEPH_MDS_STATE_RECONNECT) {
1294 dout("send_renew_caps ignoring mds%d (%s)\n",
1295 session->s_mds, ceph_mds_state_name(state));
1296 return 0;
1297 }
1298
1299 dout("send_renew_caps to mds%d (%s)\n", session->s_mds,
1300 ceph_mds_state_name(state));
2f2dc053
SW		 1301 msg = create_session_msg(CEPH_SESSION_REQUEST_RENEWCAPS,
1302 ++session->s_renew_seq);
a79832f2
SW		 1303 if (!msg)
1304 return -ENOMEM;
2f2dc053
SW		 1305 ceph_con_send(&session->s_con, msg);
1306 return 0;
1307}
1308
186e4f7a
YZ		 1309static int send_flushmsg_ack(struct ceph_mds_client *mdsc,
1310 struct ceph_mds_session *session, u64 seq)
1311{
1312 struct ceph_msg *msg;
1313
1314 dout("send_flushmsg_ack to mds%d (%s)s seq %lld\n",
a687ecaf 1315 session->s_mds, ceph_session_state_name(session->s_state), seq);
186e4f7a
YZ		 1316 msg = create_session_msg(CEPH_SESSION_FLUSHMSG_ACK, seq);
1317 if (!msg)
1318 return -ENOMEM;
1319 ceph_con_send(&session->s_con, msg);
1320 return 0;
1321}
1322
1323
2f2dc053
SW		 1324/*
1325 * Note new cap ttl, and any transition from stale -> not stale (fresh?).
0dc2570f
SW		 1326 *
1327 * Called under session->s_mutex
2f2dc053
SW		 1328 */
1329static void renewed_caps(struct ceph_mds_client *mdsc,
1330 struct ceph_mds_session *session, int is_renew)
1331{
1332 int was_stale;
1333 int wake = 0;
1334
1335 spin_lock(&session->s_cap_lock);
1ce208a6 1336 was_stale = is_renew && time_after_eq(jiffies, session->s_cap_ttl);
2f2dc053
SW		 1337
1338 session->s_cap_ttl = session->s_renew_requested +
1339 mdsc->mdsmap->m_session_timeout*HZ;
1340
1341 if (was_stale) {
1342 if (time_before(jiffies, session->s_cap_ttl)) {
1343 pr_info("mds%d caps renewed\n", session->s_mds);
1344 wake = 1;
1345 } else {
1346 pr_info("mds%d caps still stale\n", session->s_mds);
1347 }
1348 }
1349 dout("renewed_caps mds%d ttl now %lu, was %s, now %s\n",
1350 session->s_mds, session->s_cap_ttl, was_stale ? "stale" : "fresh",
1351 time_before(jiffies, session->s_cap_ttl) ? "stale" : "fresh");
1352 spin_unlock(&session->s_cap_lock);
1353
1354 if (wake)
0dc2570f 1355 wake_up_session_caps(session, 0);
2f2dc053
SW		 1356}
1357
1358/*
1359 * send a session close request
1360 */
1361static int request_close_session(struct ceph_mds_client *mdsc,
1362 struct ceph_mds_session *session)
1363{
1364 struct ceph_msg *msg;
2f2dc053
SW		 1365
1366 dout("request_close_session mds%d state %s seq %lld\n",
a687ecaf 1367 session->s_mds, ceph_session_state_name(session->s_state),
2f2dc053
SW		 1368 session->s_seq);
1369 msg = create_session_msg(CEPH_SESSION_REQUEST_CLOSE, session->s_seq);
a79832f2
SW		 1370 if (!msg)
1371 return -ENOMEM;
1372 ceph_con_send(&session->s_con, msg);
1373 return 0;
2f2dc053
SW		 1374}
1375
1376/*
1377 * Called with s_mutex held.
1378 */
1379static int __close_session(struct ceph_mds_client *mdsc,
1380 struct ceph_mds_session *session)
1381{
1382 if (session->s_state >= CEPH_MDS_SESSION_CLOSING)
1383 return 0;
1384 session->s_state = CEPH_MDS_SESSION_CLOSING;
1385 return request_close_session(mdsc, session);
1386}
1387
1388/*
1389 * Trim old(er) caps.
1390 *
1391 * Because we can't cache an inode without one or more caps, we do
1392 * this indirectly: if a cap is unused, we prune its aliases, at which
1393 * point the inode will hopefully get dropped to.
1394 *
1395 * Yes, this is a bit sloppy. Our only real goal here is to respond to
1396 * memory pressure from the MDS, though, so it needn't be perfect.
1397 */
1398static int trim_caps_cb(struct inode *inode, struct ceph_cap *cap, void *arg)
1399{
1400 struct ceph_mds_session *session = arg;
1401 struct ceph_inode_info *ci = ceph_inode(inode);
979abfdd 1402 int used, wanted, oissued, mine;
2f2dc053
SW		 1403
1404 if (session->s_trim_caps <= 0)
1405 return -1;
1406
be655596 1407 spin_lock(&ci->i_ceph_lock);
2f2dc053
SW		 1408 mine = cap->issued | cap->implemented;
1409 used = __ceph_caps_used(ci);
979abfdd 1410 wanted = __ceph_caps_file_wanted(ci);
2f2dc053
SW		 1411 oissued = __ceph_caps_issued_other(ci, cap);
1412
979abfdd 1413 dout("trim_caps_cb %p cap %p mine %s oissued %s used %s wanted %s\n",
2f2dc053 1414 inode, cap, ceph_cap_string(mine), ceph_cap_string(oissued),
979abfdd
YZ		 1415 ceph_cap_string(used), ceph_cap_string(wanted));
1416 if (cap == ci->i_auth_cap) {
622f3e25
YZ		 1417 if (ci->i_dirty_caps || ci->i_flushing_caps ||
1418 !list_empty(&ci->i_cap_snaps))
979abfdd
YZ		 1419 goto out;
1420 if ((used | wanted) & CEPH_CAP_ANY_WR)
1421 goto out;
1422 }
5e804ac4
YZ		 1423 /* The inode has cached pages, but it's no longer used.
1424 * we can safely drop it */
1425 if (wanted == 0 && used == CEPH_CAP_FILE_CACHE &&
1426 !(oissued & CEPH_CAP_FILE_CACHE)) {
1427 used = 0;
1428 oissued = 0;
1429 }
979abfdd 1430 if ((used | wanted) & ~oissued & mine)
2f2dc053
SW		 1431 goto out; /* we need these caps */
1432
1433 session->s_trim_caps--;
1434 if (oissued) {
1435 /* we aren't the only cap.. just remove us */
a096b09a 1436 __ceph_remove_cap(cap, true);
2f2dc053 1437 } else {
5e804ac4 1438 /* try dropping referring dentries */
be655596 1439 spin_unlock(&ci->i_ceph_lock);
2f2dc053
SW		 1440 d_prune_aliases(inode);
1441 dout("trim_caps_cb %p cap %p pruned, count now %d\n",
1442 inode, cap, atomic_read(&inode->i_count));
1443 return 0;
1444 }
1445
1446out:
be655596 1447 spin_unlock(&ci->i_ceph_lock);
2f2dc053
SW		 1448 return 0;
1449}
1450
1451/*
1452 * Trim session cap count down to some max number.
1453 */
1454static int trim_caps(struct ceph_mds_client *mdsc,
1455 struct ceph_mds_session *session,
1456 int max_caps)
1457{
1458 int trim_caps = session->s_nr_caps - max_caps;
1459
1460 dout("trim_caps mds%d start: %d / %d, trim %d\n",
1461 session->s_mds, session->s_nr_caps, max_caps, trim_caps);
1462 if (trim_caps > 0) {
1463 session->s_trim_caps = trim_caps;
1464 iterate_session_caps(session, trim_caps_cb, session);
1465 dout("trim_caps mds%d done: %d / %d, trimmed %d\n",
1466 session->s_mds, session->s_nr_caps, max_caps,
1467 trim_caps - session->s_trim_caps);
5dacf091 1468 session->s_trim_caps = 0;
2f2dc053 1469 }
a56371d9 1470
a56371d9 1471 ceph_send_cap_releases(mdsc, session);
2f2dc053
SW		 1472 return 0;
1473}
1474
8310b089
YZ		 1475static int check_capsnap_flush(struct ceph_inode_info *ci,
1476 u64 want_snap_seq)
d3383a8e 1477{
8310b089 1478 int ret = 1;
d3383a8e 1479 spin_lock(&ci->i_ceph_lock);
affbc19a
YZ		 1480 if (want_snap_seq > 0 && !list_empty(&ci->i_cap_snaps)) {
1481 struct ceph_cap_snap *capsnap =
1482 list_first_entry(&ci->i_cap_snaps,
1483 struct ceph_cap_snap, ci_item);
8310b089 1484 ret = capsnap->follows >= want_snap_seq;
affbc19a 1485 }
d3383a8e 1486 spin_unlock(&ci->i_ceph_lock);
8310b089
YZ		 1487 return ret;
1488}
1489
1490static int check_caps_flush(struct ceph_mds_client *mdsc,
1491 u64 want_flush_tid)
1492{
1493 struct rb_node *n;
1494 struct ceph_cap_flush *cf;
1495 int ret = 1;
1496
1497 spin_lock(&mdsc->cap_dirty_lock);
1498 n = rb_first(&mdsc->cap_flush_tree);
1499 cf = n ? rb_entry(n, struct ceph_cap_flush, g_node) : NULL;
1500 if (cf && cf->tid <= want_flush_tid) {
1501 dout("check_caps_flush still flushing tid %llu <= %llu\n",
1502 cf->tid, want_flush_tid);
1503 ret = 0;
1504 }
1505 spin_unlock(&mdsc->cap_dirty_lock);
1506 return ret;
d3383a8e
YZ		 1507}
1508
2f2dc053
SW		 1509/*
1510 * flush all dirty inode data to disk.
1511 *
8310b089 1512 * returns true if we've flushed through want_flush_tid
2f2dc053 1513 */
affbc19a 1514static void wait_caps_flush(struct ceph_mds_client *mdsc,
8310b089 1515 u64 want_flush_tid, u64 want_snap_seq)
2f2dc053 1516{
d3383a8e 1517 int mds;
2f2dc053 1518
8310b089
YZ		 1519 dout("check_caps_flush want %llu snap want %llu\n",
1520 want_flush_tid, want_snap_seq);
2f2dc053 1521 mutex_lock(&mdsc->mutex);
affbc19a 1522 for (mds = 0; mds < mdsc->max_sessions; ) {
2f2dc053 1523 struct ceph_mds_session *session = mdsc->sessions[mds];
8310b089 1524 struct inode *inode = NULL;
2f2dc053 1525
affbc19a
YZ		 1526 if (!session) {
1527 mds++;
2f2dc053 1528 continue;
affbc19a 1529 }
2f2dc053
SW		 1530 get_session(session);
1531 mutex_unlock(&mdsc->mutex);
1532
1533 mutex_lock(&session->s_mutex);
affbc19a
YZ		 1534 if (!list_empty(&session->s_cap_snaps_flushing)) {
1535 struct ceph_cap_snap *capsnap =
1536 list_first_entry(&session->s_cap_snaps_flushing,
1537 struct ceph_cap_snap,
1538 flushing_item);
1539 struct ceph_inode_info *ci = capsnap->ci;
8310b089 1540 if (!check_capsnap_flush(ci, want_snap_seq)) {
affbc19a
YZ		 1541 dout("check_cap_flush still flushing snap %p "
1542 "follows %lld <= %lld to mds%d\n",
1543 &ci->vfs_inode, capsnap->follows,
1544 want_snap_seq, mds);
8310b089 1545 inode = igrab(&ci->vfs_inode);
2f2dc053 1546 }
2f2dc053
SW		 1547 }
1548 mutex_unlock(&session->s_mutex);
1549 ceph_put_mds_session(session);
1550
8310b089 1551 if (inode) {
affbc19a 1552 wait_event(mdsc->cap_flushing_wq,
8310b089
YZ		 1553 check_capsnap_flush(ceph_inode(inode),
1554 want_snap_seq));
1555 iput(inode);
1556 } else {
affbc19a 1557 mds++;
8310b089 1558 }
affbc19a 1559
2f2dc053
SW		 1560 mutex_lock(&mdsc->mutex);
1561 }
2f2dc053 1562 mutex_unlock(&mdsc->mutex);
8310b089
YZ		 1563
1564 wait_event(mdsc->cap_flushing_wq,
1565 check_caps_flush(mdsc, want_flush_tid));
1566
1567 dout("check_caps_flush ok, flushed thru %llu\n", want_flush_tid);
2f2dc053
SW		 1568}
1569
1570/*
1571 * called under s_mutex
1572 */
3d7ded4d
SW		 1573void ceph_send_cap_releases(struct ceph_mds_client *mdsc,
1574 struct ceph_mds_session *session)
2f2dc053 1575{
745a8e3b
YZ		 1576 struct ceph_msg *msg = NULL;
1577 struct ceph_mds_cap_release *head;
1578 struct ceph_mds_cap_item *item;
1579 struct ceph_cap *cap;
1580 LIST_HEAD(tmp_list);
1581 int num_cap_releases;
2f2dc053 1582
0f8605f2 1583 spin_lock(&session->s_cap_lock);
745a8e3b
YZ		 1584again:
1585 list_splice_init(&session->s_cap_releases, &tmp_list);
1586 num_cap_releases = session->s_num_cap_releases;
1587 session->s_num_cap_releases = 0;
2f2dc053 1588 spin_unlock(&session->s_cap_lock);
e01a5946 1589
745a8e3b
YZ		 1590 while (!list_empty(&tmp_list)) {
1591 if (!msg) {
1592 msg = ceph_msg_new(CEPH_MSG_CLIENT_CAPRELEASE,
09cbfeaf 1593 PAGE_SIZE, GFP_NOFS, false);
745a8e3b
YZ		 1594 if (!msg)
1595 goto out_err;
1596 head = msg->front.iov_base;
1597 head->num = cpu_to_le32(0);
1598 msg->front.iov_len = sizeof(*head);
1599 }
1600 cap = list_first_entry(&tmp_list, struct ceph_cap,
1601 session_caps);
1602 list_del(&cap->session_caps);
1603 num_cap_releases--;
e01a5946 1604
00bd8edb 1605 head = msg->front.iov_base;
745a8e3b
YZ		 1606 le32_add_cpu(&head->num, 1);
1607 item = msg->front.iov_base + msg->front.iov_len;
1608 item->ino = cpu_to_le64(cap->cap_ino);
1609 item->cap_id = cpu_to_le64(cap->cap_id);
1610 item->migrate_seq = cpu_to_le32(cap->mseq);
1611 item->seq = cpu_to_le32(cap->issue_seq);
1612 msg->front.iov_len += sizeof(*item);
1613
1614 ceph_put_cap(mdsc, cap);
1615
1616 if (le32_to_cpu(head->num) == CEPH_CAPS_PER_RELEASE) {
1617 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
1618 dout("send_cap_releases mds%d %p\n", session->s_mds, msg);
1619 ceph_con_send(&session->s_con, msg);
1620 msg = NULL;
1621 }
00bd8edb 1622 }
e01a5946 1623
745a8e3b 1624 BUG_ON(num_cap_releases != 0);
e01a5946 1625
745a8e3b
YZ		 1626 spin_lock(&session->s_cap_lock);
1627 if (!list_empty(&session->s_cap_releases))
1628 goto again;
1629 spin_unlock(&session->s_cap_lock);
1630
1631 if (msg) {
1632 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
1633 dout("send_cap_releases mds%d %p\n", session->s_mds, msg);
1634 ceph_con_send(&session->s_con, msg);
e01a5946 1635 }
745a8e3b
YZ		 1636 return;
1637out_err:
1638 pr_err("send_cap_releases mds%d, failed to allocate message\n",
1639 session->s_mds);
1640 spin_lock(&session->s_cap_lock);
1641 list_splice(&tmp_list, &session->s_cap_releases);
1642 session->s_num_cap_releases += num_cap_releases;
1643 spin_unlock(&session->s_cap_lock);
e01a5946
SW		 1644}
1645
2f2dc053
SW		 1646/*
1647 * requests
1648 */
1649
54008399
YZ		 1650int ceph_alloc_readdir_reply_buffer(struct ceph_mds_request *req,
1651 struct inode *dir)
1652{
1653 struct ceph_inode_info *ci = ceph_inode(dir);
1654 struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1655 struct ceph_mount_options *opt = req->r_mdsc->fsc->mount_options;
2a5beea3 1656 size_t size = sizeof(struct ceph_mds_reply_dir_entry);
54008399
YZ		 1657 int order, num_entries;
1658
1659 spin_lock(&ci->i_ceph_lock);
1660 num_entries = ci->i_files + ci->i_subdirs;
1661 spin_unlock(&ci->i_ceph_lock);
1662 num_entries = max(num_entries, 1);
1663 num_entries = min(num_entries, opt->max_readdir);
1664
1665 order = get_order(size * num_entries);
1666 while (order >= 0) {
2a5beea3
YZ		 1667 rinfo->dir_entries = (void*)__get_free_pages(GFP_KERNEL |
1668 __GFP_NOWARN,
1669 order);
1670 if (rinfo->dir_entries)
54008399
YZ		 1671 break;
1672 order--;
1673 }
2a5beea3 1674 if (!rinfo->dir_entries)
54008399
YZ		 1675 return -ENOMEM;
1676
1677 num_entries = (PAGE_SIZE << order) / size;
1678 num_entries = min(num_entries, opt->max_readdir);
1679
1680 rinfo->dir_buf_size = PAGE_SIZE << order;
1681 req->r_num_caps = num_entries + 1;
1682 req->r_args.readdir.max_entries = cpu_to_le32(num_entries);
1683 req->r_args.readdir.max_bytes = cpu_to_le32(opt->max_readdir_bytes);
1684 return 0;
1685}
1686
2f2dc053
SW		 1687/*
1688 * Create an mds request.
1689 */
1690struct ceph_mds_request *
1691ceph_mdsc_create_request(struct ceph_mds_client *mdsc, int op, int mode)
1692{
1693 struct ceph_mds_request *req = kzalloc(sizeof(*req), GFP_NOFS);
1694
1695 if (!req)
1696 return ERR_PTR(-ENOMEM);
1697
b4556396 1698 mutex_init(&req->r_fill_mutex);
37151668 1699 req->r_mdsc = mdsc;
2f2dc053
SW		 1700 req->r_started = jiffies;
1701 req->r_resend_mds = -1;
1702 INIT_LIST_HEAD(&req->r_unsafe_dir_item);
68cd5b4b 1703 INIT_LIST_HEAD(&req->r_unsafe_target_item);
2f2dc053 1704 req->r_fmode = -1;
153c8e6b 1705 kref_init(&req->r_kref);
fcd00b68 1706 RB_CLEAR_NODE(&req->r_node);
2f2dc053
SW		 1707 INIT_LIST_HEAD(&req->r_wait);
1708 init_completion(&req->r_completion);
1709 init_completion(&req->r_safe_completion);
1710 INIT_LIST_HEAD(&req->r_unsafe_item);
1711
8bbd4714 1712 req->r_stamp = current_fs_time(mdsc->fsc->sb);
b8e69066 1713
2f2dc053
SW		 1714 req->r_op = op;
1715 req->r_direct_mode = mode;
1716 return req;
1717}
1718
1719/*
44ca18f2 1720 * return oldest (lowest) request, tid in request tree, 0 if none.
2f2dc053
SW		 1721 *
1722 * called under mdsc->mutex.
1723 */
44ca18f2
SW		 1724static struct ceph_mds_request *__get_oldest_req(struct ceph_mds_client *mdsc)
1725{
1726 if (RB_EMPTY_ROOT(&mdsc->request_tree))
1727 return NULL;
1728 return rb_entry(rb_first(&mdsc->request_tree),
1729 struct ceph_mds_request, r_node);
1730}
1731
e8a7b8b1 1732static inline u64 __get_oldest_tid(struct ceph_mds_client *mdsc)
2f2dc053 1733{
e8a7b8b1 1734 return mdsc->oldest_tid;
2f2dc053
SW		 1735}
1736
1737/*
1738 * Build a dentry's path. Allocate on heap; caller must kfree. Based
1739 * on build_path_from_dentry in fs/cifs/dir.c.
1740 *
1741 * If @stop_on_nosnap, generate path relative to the first non-snapped
1742 * inode.
1743 *
1744 * Encode hidden .snap dirs as a double /, i.e.
1745 * foo/.snap/bar -> foo//bar
1746 */
1747char *ceph_mdsc_build_path(struct dentry *dentry, int *plen, u64 *base,
1748 int stop_on_nosnap)
1749{
1750 struct dentry *temp;
1751 char *path;
1752 int len, pos;
1b71fe2e 1753 unsigned seq;
2f2dc053
SW		 1754
1755 if (dentry == NULL)
1756 return ERR_PTR(-EINVAL);
1757
1758retry:
1759 len = 0;
1b71fe2e
AV		 1760 seq = read_seqbegin(&rename_lock);
1761 rcu_read_lock();
2f2dc053 1762 for (temp = dentry; !IS_ROOT(temp);) {
2b0143b5 1763 struct inode *inode = d_inode(temp);
2f2dc053
SW		 1764 if (inode && ceph_snap(inode) == CEPH_SNAPDIR)
1765 len++; /* slash only */
1766 else if (stop_on_nosnap && inode &&
1767 ceph_snap(inode) == CEPH_NOSNAP)
1768 break;
1769 else
1770 len += 1 + temp->d_name.len;
1771 temp = temp->d_parent;
2f2dc053 1772 }
1b71fe2e 1773 rcu_read_unlock();
2f2dc053
SW		 1774 if (len)
1775 len--; /* no leading '/' */
1776
1777 path = kmalloc(len+1, GFP_NOFS);
1778 if (path == NULL)
1779 return ERR_PTR(-ENOMEM);
1780 pos = len;
1781 path[pos] = 0; /* trailing null */
1b71fe2e 1782 rcu_read_lock();
2f2dc053 1783 for (temp = dentry; !IS_ROOT(temp) && pos != 0; ) {
1b71fe2e 1784 struct inode *inode;
2f2dc053 1785
1b71fe2e 1786 spin_lock(&temp->d_lock);
2b0143b5 1787 inode = d_inode(temp);
2f2dc053 1788 if (inode && ceph_snap(inode) == CEPH_SNAPDIR) {
104648ad 1789 dout("build_path path+%d: %p SNAPDIR\n",
2f2dc053
SW		 1790 pos, temp);
1791 } else if (stop_on_nosnap && inode &&
1792 ceph_snap(inode) == CEPH_NOSNAP) {
9d5a09e6 1793 spin_unlock(&temp->d_lock);
2f2dc053
SW		 1794 break;
1795 } else {
1796 pos -= temp->d_name.len;
1b71fe2e
AV		 1797 if (pos < 0) {
1798 spin_unlock(&temp->d_lock);
2f2dc053 1799 break;
1b71fe2e 1800 }
2f2dc053
SW		 1801 strncpy(path + pos, temp->d_name.name,
1802 temp->d_name.len);
2f2dc053 1803 }
1b71fe2e 1804 spin_unlock(&temp->d_lock);
2f2dc053
SW		 1805 if (pos)
1806 path[--pos] = '/';
1807 temp = temp->d_parent;
2f2dc053 1808 }
1b71fe2e
AV		 1809 rcu_read_unlock();
1810 if (pos != 0 || read_seqretry(&rename_lock, seq)) {
104648ad 1811 pr_err("build_path did not end path lookup where "
2f2dc053
SW		 1812 "expected, namelen is %d, pos is %d\n", len, pos);
1813 /* presumably this is only possible if racing with a
1814 rename of one of the parent directories (we can not
1815 lock the dentries above us to prevent this, but
1816 retrying should be harmless) */
1817 kfree(path);
1818 goto retry;
1819 }
1820
2b0143b5 1821 *base = ceph_ino(d_inode(temp));
2f2dc053 1822 *plen = len;
104648ad 1823 dout("build_path on %p %d built %llx '%.*s'\n",
84d08fa8 1824 dentry, d_count(dentry), *base, len, path);
2f2dc053
SW		 1825 return path;
1826}
1827
1828static int build_dentry_path(struct dentry *dentry,
1829 const char **ppath, int *ppathlen, u64 *pino,
1830 int *pfreepath)
1831{
1832 char *path;
1833
2b0143b5
DH		 1834 if (ceph_snap(d_inode(dentry->d_parent)) == CEPH_NOSNAP) {
1835 *pino = ceph_ino(d_inode(dentry->d_parent));
2f2dc053
SW		 1836 *ppath = dentry->d_name.name;
1837 *ppathlen = dentry->d_name.len;
1838 return 0;
1839 }
1840 path = ceph_mdsc_build_path(dentry, ppathlen, pino, 1);
1841 if (IS_ERR(path))
1842 return PTR_ERR(path);
1843 *ppath = path;
1844 *pfreepath = 1;
1845 return 0;
1846}
1847
1848static int build_inode_path(struct inode *inode,
1849 const char **ppath, int *ppathlen, u64 *pino,
1850 int *pfreepath)
1851{
1852 struct dentry *dentry;
1853 char *path;
1854
1855 if (ceph_snap(inode) == CEPH_NOSNAP) {
1856 *pino = ceph_ino(inode);
1857 *ppathlen = 0;
1858 return 0;
1859 }
1860 dentry = d_find_alias(inode);
1861 path = ceph_mdsc_build_path(dentry, ppathlen, pino, 1);
1862 dput(dentry);
1863 if (IS_ERR(path))
1864 return PTR_ERR(path);
1865 *ppath = path;
1866 *pfreepath = 1;
1867 return 0;
1868}
1869
1870/*
1871 * request arguments may be specified via an inode *, a dentry *, or
1872 * an explicit ino+path.
1873 */
1874static int set_request_path_attr(struct inode *rinode, struct dentry *rdentry,
1875 const char *rpath, u64 rino,
1876 const char **ppath, int *pathlen,
1877 u64 *ino, int *freepath)
1878{
1879 int r = 0;
1880
1881 if (rinode) {
1882 r = build_inode_path(rinode, ppath, pathlen, ino, freepath);
1883 dout(" inode %p %llx.%llx\n", rinode, ceph_ino(rinode),
1884 ceph_snap(rinode));
1885 } else if (rdentry) {
1886 r = build_dentry_path(rdentry, ppath, pathlen, ino, freepath);
1887 dout(" dentry %p %llx/%.*s\n", rdentry, *ino, *pathlen,
1888 *ppath);
795858db 1889 } else if (rpath || rino) {
2f2dc053
SW		 1890 *ino = rino;
1891 *ppath = rpath;
b000056a 1892 *pathlen = rpath ? strlen(rpath) : 0;
2f2dc053
SW		 1893 dout(" path %.*s\n", *pathlen, rpath);
1894 }
1895
1896 return r;
1897}
1898
1899/*
1900 * called under mdsc->mutex
1901 */
1902static struct ceph_msg *create_request_message(struct ceph_mds_client *mdsc,
1903 struct ceph_mds_request *req,
6e6f0923 1904 int mds, bool drop_cap_releases)
2f2dc053
SW		 1905{
1906 struct ceph_msg *msg;
1907 struct ceph_mds_request_head *head;
1908 const char *path1 = NULL;
1909 const char *path2 = NULL;
1910 u64 ino1 = 0, ino2 = 0;
1911 int pathlen1 = 0, pathlen2 = 0;
1912 int freepath1 = 0, freepath2 = 0;
1913 int len;
1914 u16 releases;
1915 void *p, *end;
1916 int ret;
1917
1918 ret = set_request_path_attr(req->r_inode, req->r_dentry,
1919 req->r_path1, req->r_ino1.ino,
1920 &path1, &pathlen1, &ino1, &freepath1);
1921 if (ret < 0) {
1922 msg = ERR_PTR(ret);
1923 goto out;
1924 }
1925
1926 ret = set_request_path_attr(NULL, req->r_old_dentry,
1927 req->r_path2, req->r_ino2.ino,
1928 &path2, &pathlen2, &ino2, &freepath2);
1929 if (ret < 0) {
1930 msg = ERR_PTR(ret);
1931 goto out_free1;
1932 }
1933
1934 len = sizeof(*head) +
b8e69066 1935 pathlen1 + pathlen2 + 2*(1 + sizeof(u32) + sizeof(u64)) +
777d738a 1936 sizeof(struct ceph_timespec);
2f2dc053
SW		 1937
1938 /* calculate (max) length for cap releases */
1939 len += sizeof(struct ceph_mds_request_release) *
1940 (!!req->r_inode_drop + !!req->r_dentry_drop +
1941 !!req->r_old_inode_drop + !!req->r_old_dentry_drop);
1942 if (req->r_dentry_drop)
1943 len += req->r_dentry->d_name.len;
1944 if (req->r_old_dentry_drop)
1945 len += req->r_old_dentry->d_name.len;
1946
b61c2763 1947 msg = ceph_msg_new(CEPH_MSG_CLIENT_REQUEST, len, GFP_NOFS, false);
a79832f2
SW		 1948 if (!msg) {
1949 msg = ERR_PTR(-ENOMEM);
2f2dc053 1950 goto out_free2;
a79832f2 1951 }
2f2dc053 1952
7cfa0313 1953 msg->hdr.version = cpu_to_le16(2);
6df058c0
SW		 1954 msg->hdr.tid = cpu_to_le64(req->r_tid);
1955
2f2dc053
SW		 1956 head = msg->front.iov_base;
1957 p = msg->front.iov_base + sizeof(*head);
1958 end = msg->front.iov_base + msg->front.iov_len;
1959
1960 head->mdsmap_epoch = cpu_to_le32(mdsc->mdsmap->m_epoch);
1961 head->op = cpu_to_le32(req->r_op);
ff3d0046
EB		 1962 head->caller_uid = cpu_to_le32(from_kuid(&init_user_ns, req->r_uid));
1963 head->caller_gid = cpu_to_le32(from_kgid(&init_user_ns, req->r_gid));
2f2dc053
SW		 1964 head->args = req->r_args;
1965
1966 ceph_encode_filepath(&p, end, ino1, path1);
1967 ceph_encode_filepath(&p, end, ino2, path2);
1968
e979cf50
SW		 1969 /* make note of release offset, in case we need to replay */
1970 req->r_request_release_offset = p - msg->front.iov_base;
1971
2f2dc053
SW		 1972 /* cap releases */
1973 releases = 0;
1974 if (req->r_inode_drop)
1975 releases += ceph_encode_inode_release(&p,
2b0143b5 1976 req->r_inode ? req->r_inode : d_inode(req->r_dentry),
2f2dc053
SW		 1977 mds, req->r_inode_drop, req->r_inode_unless, 0);
1978 if (req->r_dentry_drop)
1979 releases += ceph_encode_dentry_release(&p, req->r_dentry,
1980 mds, req->r_dentry_drop, req->r_dentry_unless);
1981 if (req->r_old_dentry_drop)
1982 releases += ceph_encode_dentry_release(&p, req->r_old_dentry,
1983 mds, req->r_old_dentry_drop, req->r_old_dentry_unless);
1984 if (req->r_old_inode_drop)
1985 releases += ceph_encode_inode_release(&p,
2b0143b5 1986 d_inode(req->r_old_dentry),
2f2dc053 1987 mds, req->r_old_inode_drop, req->r_old_inode_unless, 0);
6e6f0923
YZ		 1988
1989 if (drop_cap_releases) {
1990 releases = 0;
1991 p = msg->front.iov_base + req->r_request_release_offset;
1992 }
1993
2f2dc053
SW		 1994 head->num_releases = cpu_to_le16(releases);
1995
b8e69066 1996 /* time stamp */
1f041a89
YZ		 1997 {
1998 struct ceph_timespec ts;
1999 ceph_encode_timespec(&ts, &req->r_stamp);
2000 ceph_encode_copy(&p, &ts, sizeof(ts));
2001 }
b8e69066 2002
2f2dc053
SW		 2003 BUG_ON(p > end);
2004 msg->front.iov_len = p - msg->front.iov_base;
2005 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
2006
25e6bae3
YZ		 2007 if (req->r_pagelist) {
2008 struct ceph_pagelist *pagelist = req->r_pagelist;
2009 atomic_inc(&pagelist->refcnt);
2010 ceph_msg_data_add_pagelist(msg, pagelist);
2011 msg->hdr.data_len = cpu_to_le32(pagelist->length);
2012 } else {
2013 msg->hdr.data_len = 0;
ebf18f47 2014 }
02afca6c 2015
2f2dc053
SW		 2016 msg->hdr.data_off = cpu_to_le16(0);
2017
2018out_free2:
2019 if (freepath2)
2020 kfree((char *)path2);
2021out_free1:
2022 if (freepath1)
2023 kfree((char *)path1);
2024out:
2025 return msg;
2026}
2027
2028/*
2029 * called under mdsc->mutex if error, under no mutex if
2030 * success.
2031 */
2032static void complete_request(struct ceph_mds_client *mdsc,
2033 struct ceph_mds_request *req)
2034{
2035 if (req->r_callback)
2036 req->r_callback(mdsc, req);
2037 else
03066f23 2038 complete_all(&req->r_completion);
2f2dc053
SW		 2039}
2040
2041/*
2042 * called under mdsc->mutex
2043 */
2044static int __prepare_send_request(struct ceph_mds_client *mdsc,
2045 struct ceph_mds_request *req,
6e6f0923 2046 int mds, bool drop_cap_releases)
2f2dc053
SW		 2047{
2048 struct ceph_mds_request_head *rhead;
2049 struct ceph_msg *msg;
2050 int flags = 0;
2051
2f2dc053 2052 req->r_attempts++;
e55b71f8
GF		 2053 if (req->r_inode) {
2054 struct ceph_cap *cap =
2055 ceph_get_cap_for_mds(ceph_inode(req->r_inode), mds);
2056
2057 if (cap)
2058 req->r_sent_on_mseq = cap->mseq;
2059 else
2060 req->r_sent_on_mseq = -1;
2061 }
2f2dc053
SW		 2062 dout("prepare_send_request %p tid %lld %s (attempt %d)\n", req,
2063 req->r_tid, ceph_mds_op_name(req->r_op), req->r_attempts);
2064
01a92f17 2065 if (req->r_got_unsafe) {
c5c9a0bf 2066 void *p;
01a92f17
SW		 2067 /*
2068 * Replay. Do not regenerate message (and rebuild
2069 * paths, etc.); just use the original message.
2070 * Rebuilding paths will break for renames because
2071 * d_move mangles the src name.
2072 */
2073 msg = req->r_request;
2074 rhead = msg->front.iov_base;
2075
2076 flags = le32_to_cpu(rhead->flags);
2077 flags |= CEPH_MDS_FLAG_REPLAY;
2078 rhead->flags = cpu_to_le32(flags);
2079
2080 if (req->r_target_inode)
2081 rhead->ino = cpu_to_le64(ceph_ino(req->r_target_inode));
2082
2083 rhead->num_retry = req->r_attempts - 1;
e979cf50
SW		 2084
2085 /* remove cap/dentry releases from message */
2086 rhead->num_releases = 0;
c5c9a0bf
YZ		 2087
2088 /* time stamp */
2089 p = msg->front.iov_base + req->r_request_release_offset;
1f041a89
YZ		 2090 {
2091 struct ceph_timespec ts;
2092 ceph_encode_timespec(&ts, &req->r_stamp);
2093 ceph_encode_copy(&p, &ts, sizeof(ts));
2094 }
c5c9a0bf
YZ		 2095
2096 msg->front.iov_len = p - msg->front.iov_base;
2097 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
01a92f17
SW		 2098 return 0;
2099 }
2100
2f2dc053
SW		 2101 if (req->r_request) {
2102 ceph_msg_put(req->r_request);
2103 req->r_request = NULL;
2104 }
6e6f0923 2105 msg = create_request_message(mdsc, req, mds, drop_cap_releases);
2f2dc053 2106 if (IS_ERR(msg)) {
e1518c7c 2107 req->r_err = PTR_ERR(msg);
a79832f2 2108 return PTR_ERR(msg);
2f2dc053
SW		 2109 }
2110 req->r_request = msg;
2111
2112 rhead = msg->front.iov_base;
2f2dc053
SW		 2113 rhead->oldest_client_tid = cpu_to_le64(__get_oldest_tid(mdsc));
2114 if (req->r_got_unsafe)
2115 flags |= CEPH_MDS_FLAG_REPLAY;
2116 if (req->r_locked_dir)
2117 flags |= CEPH_MDS_FLAG_WANT_DENTRY;
2118 rhead->flags = cpu_to_le32(flags);
2119 rhead->num_fwd = req->r_num_fwd;
2120 rhead->num_retry = req->r_attempts - 1;
01a92f17 2121 rhead->ino = 0;
2f2dc053
SW		 2122
2123 dout(" r_locked_dir = %p\n", req->r_locked_dir);
2f2dc053
SW		 2124 return 0;
2125}
2126
2127/*
2128 * send request, or put it on the appropriate wait list.
2129 */
2130static int __do_request(struct ceph_mds_client *mdsc,
2131 struct ceph_mds_request *req)
2132{
2133 struct ceph_mds_session *session = NULL;
2134 int mds = -1;
48fec5d0 2135 int err = 0;
2f2dc053 2136
eb1b8af3
YZ		 2137 if (req->r_err || req->r_got_result) {
2138 if (req->r_aborted)
2139 __unregister_request(mdsc, req);
2f2dc053 2140 goto out;
eb1b8af3 2141 }
2f2dc053
SW		 2142
2143 if (req->r_timeout &&
2144 time_after_eq(jiffies, req->r_started + req->r_timeout)) {
2145 dout("do_request timed out\n");
2146 err = -EIO;
2147 goto finish;
2148 }
48fec5d0
YZ		 2149 if (ACCESS_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_SHUTDOWN) {
2150 dout("do_request forced umount\n");
2151 err = -EIO;
2152 goto finish;
2153 }
2f2dc053 2154
dc69e2e9
SW		 2155 put_request_session(req);
2156
2f2dc053
SW		 2157 mds = __choose_mds(mdsc, req);
2158 if (mds < 0 ||
2159 ceph_mdsmap_get_state(mdsc->mdsmap, mds) < CEPH_MDS_STATE_ACTIVE) {
2160 dout("do_request no mds or not active, waiting for map\n");
2161 list_add(&req->r_wait, &mdsc->waiting_for_map);
2162 goto out;
2163 }
2164
2165 /* get, open session */
2166 session = __ceph_lookup_mds_session(mdsc, mds);
9c423956 2167 if (!session) {
2f2dc053 2168 session = register_session(mdsc, mds);
9c423956
SW		 2169 if (IS_ERR(session)) {
2170 err = PTR_ERR(session);
2171 goto finish;
2172 }
2173 }
dc69e2e9
SW		 2174 req->r_session = get_session(session);
2175
2f2dc053 2176 dout("do_request mds%d session %p state %s\n", mds, session,
a687ecaf 2177 ceph_session_state_name(session->s_state));
2f2dc053
SW		 2178 if (session->s_state != CEPH_MDS_SESSION_OPEN &&
2179 session->s_state != CEPH_MDS_SESSION_HUNG) {
2180 if (session->s_state == CEPH_MDS_SESSION_NEW ||
2181 session->s_state == CEPH_MDS_SESSION_CLOSING)
2182 __open_session(mdsc, session);
2183 list_add(&req->r_wait, &session->s_waiting);
2184 goto out_session;
2185 }
2186
2187 /* send request */
2f2dc053
SW		 2188 req->r_resend_mds = -1; /* forget any previous mds hint */
2189
2190 if (req->r_request_started == 0) /* note request start time */
2191 req->r_request_started = jiffies;
2192
6e6f0923 2193 err = __prepare_send_request(mdsc, req, mds, false);
2f2dc053
SW		 2194 if (!err) {
2195 ceph_msg_get(req->r_request);
2196 ceph_con_send(&session->s_con, req->r_request);
2197 }
2198
2199out_session:
2200 ceph_put_mds_session(session);
48fec5d0
YZ		 2201finish:
2202 if (err) {
2203 dout("__do_request early error %d\n", err);
2204 req->r_err = err;
2205 complete_request(mdsc, req);
2206 __unregister_request(mdsc, req);
2207 }
2f2dc053
SW		 2208out:
2209 return err;
2f2dc053
SW		 2210}
2211
2212/*
2213 * called under mdsc->mutex
2214 */
2215static void __wake_requests(struct ceph_mds_client *mdsc,
2216 struct list_head *head)
2217{
ed75ec2c
YZ		 2218 struct ceph_mds_request *req;
2219 LIST_HEAD(tmp_list);
2220
2221 list_splice_init(head, &tmp_list);
2f2dc053 2222
ed75ec2c
YZ		 2223 while (!list_empty(&tmp_list)) {
2224 req = list_entry(tmp_list.next,
2225 struct ceph_mds_request, r_wait);
2f2dc053 2226 list_del_init(&req->r_wait);
7971bd92 2227 dout(" wake request %p tid %llu\n", req, req->r_tid);
2f2dc053
SW		 2228 __do_request(mdsc, req);
2229 }
2230}
2231
2232/*
2233 * Wake up threads with requests pending for @mds, so that they can
29790f26 2234 * resubmit their requests to a possibly different mds.
2f2dc053 2235 */
29790f26 2236static void kick_requests(struct ceph_mds_client *mdsc, int mds)
2f2dc053 2237{
44ca18f2 2238 struct ceph_mds_request *req;
282c1052 2239 struct rb_node *p = rb_first(&mdsc->request_tree);
2f2dc053
SW		 2240
2241 dout("kick_requests mds%d\n", mds);
282c1052 2242 while (p) {
44ca18f2 2243 req = rb_entry(p, struct ceph_mds_request, r_node);
282c1052 2244 p = rb_next(p);
44ca18f2
SW		 2245 if (req->r_got_unsafe)
2246 continue;
3de22be6
YZ		 2247 if (req->r_attempts > 0)
2248 continue; /* only new requests */
44ca18f2
SW		 2249 if (req->r_session &&
2250 req->r_session->s_mds == mds) {
2251 dout(" kicking tid %llu\n", req->r_tid);
03974e81 2252 list_del_init(&req->r_wait);
44ca18f2 2253 __do_request(mdsc, req);
2f2dc053
SW		 2254 }
2255 }
2256}
2257
2258void ceph_mdsc_submit_request(struct ceph_mds_client *mdsc,
2259 struct ceph_mds_request *req)
2260{
2261 dout("submit_request on %p\n", req);
2262 mutex_lock(&mdsc->mutex);
2263 __register_request(mdsc, req, NULL);
2264 __do_request(mdsc, req);
2265 mutex_unlock(&mdsc->mutex);
2266}
2267
2268/*
2269 * Synchrously perform an mds request. Take care of all of the
2270 * session setup, forwarding, retry details.
2271 */
2272int ceph_mdsc_do_request(struct ceph_mds_client *mdsc,
2273 struct inode *dir,
2274 struct ceph_mds_request *req)
2275{
2276 int err;
2277
2278 dout("do_request on %p\n", req);
2279
2280 /* take CAP_PIN refs for r_inode, r_locked_dir, r_old_dentry */
2281 if (req->r_inode)
2282 ceph_get_cap_refs(ceph_inode(req->r_inode), CEPH_CAP_PIN);
2283 if (req->r_locked_dir)
2284 ceph_get_cap_refs(ceph_inode(req->r_locked_dir), CEPH_CAP_PIN);
844d87c3 2285 if (req->r_old_dentry_dir)
41b02e1f
SW		 2286 ceph_get_cap_refs(ceph_inode(req->r_old_dentry_dir),
2287 CEPH_CAP_PIN);
2f2dc053 2288
5ea5c5e0
YZ		 2289 /* deny access to directories with pool_ns layouts */
2290 if (req->r_inode && S_ISDIR(req->r_inode->i_mode) &&
2291 ceph_inode(req->r_inode)->i_pool_ns_len)
2292 return -EIO;
2293 if (req->r_locked_dir &&
2294 ceph_inode(req->r_locked_dir)->i_pool_ns_len)
2295 return -EIO;
2296
2f2dc053
SW		 2297 /* issue */
2298 mutex_lock(&mdsc->mutex);
2299 __register_request(mdsc, req, dir);
2300 __do_request(mdsc, req);
2301
e1518c7c
SW		 2302 if (req->r_err) {
2303 err = req->r_err;
e1518c7c 2304 goto out;
2f2dc053
SW		 2305 }
2306
e1518c7c
SW		 2307 /* wait */
2308 mutex_unlock(&mdsc->mutex);
2309 dout("do_request waiting\n");
5be73034 2310 if (!req->r_timeout && req->r_wait_for_completion) {
9280be24 2311 err = req->r_wait_for_completion(mdsc, req);
e1518c7c 2312 } else {
5be73034
ID		 2313 long timeleft = wait_for_completion_killable_timeout(
2314 &req->r_completion,
2315 ceph_timeout_jiffies(req->r_timeout));
2316 if (timeleft > 0)
2317 err = 0;
2318 else if (!timeleft)
2319 err = -EIO; /* timed out */
2320 else
2321 err = timeleft; /* killed */
e1518c7c
SW		 2322 }
2323 dout("do_request waited, got %d\n", err);
2324 mutex_lock(&mdsc->mutex);
5b1daecd 2325
e1518c7c
SW		 2326 /* only abort if we didn't race with a real reply */
2327 if (req->r_got_result) {
2328 err = le32_to_cpu(req->r_reply_info.head->result);
2329 } else if (err < 0) {
2330 dout("aborted request %lld with %d\n", req->r_tid, err);
b4556396
SW		 2331
2332 /*
2333 * ensure we aren't running concurrently with
2334 * ceph_fill_trace or ceph_readdir_prepopulate, which
2335 * rely on locks (dir mutex) held by our caller.
2336 */
2337 mutex_lock(&req->r_fill_mutex);
e1518c7c
SW		 2338 req->r_err = err;
2339 req->r_aborted = true;
b4556396 2340 mutex_unlock(&req->r_fill_mutex);
5b1daecd 2341
e1518c7c 2342 if (req->r_locked_dir &&
167c9e35
SW		 2343 (req->r_op & CEPH_MDS_OP_WRITE))
2344 ceph_invalidate_dir_request(req);
2f2dc053 2345 } else {
e1518c7c 2346 err = req->r_err;
2f2dc053 2347 }
2f2dc053 2348
e1518c7c
SW		 2349out:
2350 mutex_unlock(&mdsc->mutex);
2f2dc053
SW		 2351 dout("do_request %p done, result %d\n", req, err);
2352 return err;
2353}
2354
167c9e35 2355/*
2f276c51 2356 * Invalidate dir's completeness, dentry lease state on an aborted MDS
167c9e35
SW		 2357 * namespace request.
2358 */
2359void ceph_invalidate_dir_request(struct ceph_mds_request *req)
2360{
2361 struct inode *inode = req->r_locked_dir;
167c9e35 2362
2f276c51 2363 dout("invalidate_dir_request %p (complete, lease(s))\n", inode);
167c9e35 2364
2f276c51 2365 ceph_dir_clear_complete(inode);
167c9e35
SW		 2366 if (req->r_dentry)
2367 ceph_invalidate_dentry_lease(req->r_dentry);
2368 if (req->r_old_dentry)
2369 ceph_invalidate_dentry_lease(req->r_old_dentry);
2370}
2371
2f2dc053
SW		 2372/*
2373 * Handle mds reply.
2374 *
2375 * We take the session mutex and parse and process the reply immediately.
2376 * This preserves the logical ordering of replies, capabilities, etc., sent
2377 * by the MDS as they are applied to our local cache.
2378 */
2379static void handle_reply(struct ceph_mds_session *session, struct ceph_msg *msg)
2380{
2381 struct ceph_mds_client *mdsc = session->s_mdsc;
2382 struct ceph_mds_request *req;
2383 struct ceph_mds_reply_head *head = msg->front.iov_base;
2384 struct ceph_mds_reply_info_parsed *rinfo; /* parsed reply info */
982d6011 2385 struct ceph_snap_realm *realm;
2f2dc053
SW		 2386 u64 tid;
2387 int err, result;
2600d2dd 2388 int mds = session->s_mds;
2f2dc053 2389
2f2dc053
SW		 2390 if (msg->front.iov_len < sizeof(*head)) {
2391 pr_err("mdsc_handle_reply got corrupt (short) reply\n");
9ec7cab1 2392 ceph_msg_dump(msg);
2f2dc053
SW		 2393 return;
2394 }
2395
2396 /* get request, session */
6df058c0 2397 tid = le64_to_cpu(msg->hdr.tid);
2f2dc053 2398 mutex_lock(&mdsc->mutex);
fcd00b68 2399 req = lookup_get_request(mdsc, tid);
2f2dc053
SW		 2400 if (!req) {
2401 dout("handle_reply on unknown tid %llu\n", tid);
2402 mutex_unlock(&mdsc->mutex);
2403 return;
2404 }
2405 dout("handle_reply %p\n", req);
2f2dc053
SW		 2406
2407 /* correct session? */
d96d6049 2408 if (req->r_session != session) {
2f2dc053
SW		 2409 pr_err("mdsc_handle_reply got %llu on session mds%d"
2410 " not mds%d\n", tid, session->s_mds,
2411 req->r_session ? req->r_session->s_mds : -1);
2412 mutex_unlock(&mdsc->mutex);
2413 goto out;
2414 }
2415
2416 /* dup? */
2417 if ((req->r_got_unsafe && !head->safe) ||
2418 (req->r_got_safe && head->safe)) {
f3ae1b97 2419 pr_warn("got a dup %s reply on %llu from mds%d\n",
2f2dc053
SW		 2420 head->safe ? "safe" : "unsafe", tid, mds);
2421 mutex_unlock(&mdsc->mutex);
2422 goto out;
2423 }
1550d34e 2424 if (req->r_got_safe) {
f3ae1b97 2425 pr_warn("got unsafe after safe on %llu from mds%d\n",
85792d0d
SW		 2426 tid, mds);
2427 mutex_unlock(&mdsc->mutex);
2428 goto out;
2429 }
2f2dc053
SW		 2430
2431 result = le32_to_cpu(head->result);
2432
2433 /*
e55b71f8
GF		 2434 * Handle an ESTALE
2435 * if we're not talking to the authority, send to them
2436 * if the authority has changed while we weren't looking,
2437 * send to new authority
2438 * Otherwise we just have to return an ESTALE
2f2dc053
SW		 2439 */
2440 if (result == -ESTALE) {
e55b71f8 2441 dout("got ESTALE on request %llu", req->r_tid);
51da8e8c 2442 req->r_resend_mds = -1;
ca18bede 2443 if (req->r_direct_mode != USE_AUTH_MDS) {
e55b71f8
GF		 2444 dout("not using auth, setting for that now");
2445 req->r_direct_mode = USE_AUTH_MDS;
2f2dc053
SW		 2446 __do_request(mdsc, req);
2447 mutex_unlock(&mdsc->mutex);
2448 goto out;
e55b71f8 2449 } else {
ca18bede
YZ		 2450 int mds = __choose_mds(mdsc, req);
2451 if (mds >= 0 && mds != req->r_session->s_mds) {
2452 dout("but auth changed, so resending");
e55b71f8
GF		 2453 __do_request(mdsc, req);
2454 mutex_unlock(&mdsc->mutex);
2455 goto out;
2456 }
2f2dc053 2457 }
e55b71f8 2458 dout("have to return ESTALE on request %llu", req->r_tid);
2f2dc053
SW		 2459 }
2460
e55b71f8 2461
2f2dc053
SW		 2462 if (head->safe) {
2463 req->r_got_safe = true;
2464 __unregister_request(mdsc, req);
2f2dc053
SW		 2465
2466 if (req->r_got_unsafe) {
2467 /*
2468 * We already handled the unsafe response, now do the
2469 * cleanup. No need to examine the response; the MDS
2470 * doesn't include any result info in the safe
2471 * response. And even if it did, there is nothing
2472 * useful we could do with a revised return value.
2473 */
2474 dout("got safe reply %llu, mds%d\n", tid, mds);
2475 list_del_init(&req->r_unsafe_item);
2476
2477 /* last unsafe request during umount? */
44ca18f2 2478 if (mdsc->stopping && !__get_oldest_req(mdsc))
03066f23 2479 complete_all(&mdsc->safe_umount_waiters);
2f2dc053
SW		 2480 mutex_unlock(&mdsc->mutex);
2481 goto out;
2482 }
e1518c7c 2483 } else {
2f2dc053
SW		 2484 req->r_got_unsafe = true;
2485 list_add_tail(&req->r_unsafe_item, &req->r_session->s_unsafe);
4c06ace8
YZ		 2486 if (req->r_unsafe_dir) {
2487 struct ceph_inode_info *ci =
2488 ceph_inode(req->r_unsafe_dir);
2489 spin_lock(&ci->i_unsafe_lock);
2490 list_add_tail(&req->r_unsafe_dir_item,
2491 &ci->i_unsafe_dirops);
2492 spin_unlock(&ci->i_unsafe_lock);
2493 }
2f2dc053
SW		 2494 }
2495
2496 dout("handle_reply tid %lld result %d\n", tid, result);
2497 rinfo = &req->r_reply_info;
14303d20 2498 err = parse_reply_info(msg, rinfo, session->s_con.peer_features);
2f2dc053
SW		 2499 mutex_unlock(&mdsc->mutex);
2500
2501 mutex_lock(&session->s_mutex);
2502 if (err < 0) {
25933abd 2503 pr_err("mdsc_handle_reply got corrupt reply mds%d(tid:%lld)\n", mds, tid);
9ec7cab1 2504 ceph_msg_dump(msg);
2f2dc053
SW		 2505 goto out_err;
2506 }
2507
2508 /* snap trace */
982d6011 2509 realm = NULL;
2f2dc053
SW		 2510 if (rinfo->snapblob_len) {
2511 down_write(&mdsc->snap_rwsem);
2512 ceph_update_snap_trace(mdsc, rinfo->snapblob,
982d6011
YZ		 2513 rinfo->snapblob + rinfo->snapblob_len,
2514 le32_to_cpu(head->op) == CEPH_MDS_OP_RMSNAP,
2515 &realm);
2f2dc053
SW		 2516 downgrade_write(&mdsc->snap_rwsem);
2517 } else {
2518 down_read(&mdsc->snap_rwsem);
2519 }
2520
2521 /* insert trace into our cache */
b4556396 2522 mutex_lock(&req->r_fill_mutex);
315f2408 2523 current->journal_info = req;
3d14c5d2 2524 err = ceph_fill_trace(mdsc->fsc->sb, req, req->r_session);
2f2dc053 2525 if (err == 0) {
6e8575fa 2526 if (result == 0 && (req->r_op == CEPH_MDS_OP_READDIR ||
81c6aea5 2527 req->r_op == CEPH_MDS_OP_LSSNAP))
2f2dc053 2528 ceph_readdir_prepopulate(req, req->r_session);
37151668 2529 ceph_unreserve_caps(mdsc, &req->r_caps_reservation);
2f2dc053 2530 }
315f2408 2531 current->journal_info = NULL;
b4556396 2532 mutex_unlock(&req->r_fill_mutex);
2f2dc053
SW		 2533
2534 up_read(&mdsc->snap_rwsem);
982d6011
YZ		 2535 if (realm)
2536 ceph_put_snap_realm(mdsc, realm);
68cd5b4b
YZ		 2537
2538 if (err == 0 && req->r_got_unsafe && req->r_target_inode) {
2539 struct ceph_inode_info *ci = ceph_inode(req->r_target_inode);
2540 spin_lock(&ci->i_unsafe_lock);
2541 list_add_tail(&req->r_unsafe_target_item, &ci->i_unsafe_iops);
2542 spin_unlock(&ci->i_unsafe_lock);
2543 }
2f2dc053 2544out_err:
e1518c7c
SW		 2545 mutex_lock(&mdsc->mutex);
2546 if (!req->r_aborted) {
2547 if (err) {
2548 req->r_err = err;
2549 } else {
5fdb1389 2550 req->r_reply = ceph_msg_get(msg);
e1518c7c
SW		 2551 req->r_got_result = true;
2552 }
2f2dc053 2553 } else {
e1518c7c 2554 dout("reply arrived after request %lld was aborted\n", tid);
2f2dc053 2555 }
e1518c7c 2556 mutex_unlock(&mdsc->mutex);
2f2dc053 2557
2f2dc053
SW		 2558 mutex_unlock(&session->s_mutex);
2559
2560 /* kick calling process */
2561 complete_request(mdsc, req);
2562out:
2563 ceph_mdsc_put_request(req);
2564 return;
2565}
2566
2567
2568
2569/*
2570 * handle mds notification that our request has been forwarded.
2571 */
2600d2dd
SW		 2572static void handle_forward(struct ceph_mds_client *mdsc,
2573 struct ceph_mds_session *session,
2574 struct ceph_msg *msg)
2f2dc053
SW		 2575{
2576 struct ceph_mds_request *req;
a1ea787c 2577 u64 tid = le64_to_cpu(msg->hdr.tid);
2f2dc053
SW		 2578 u32 next_mds;
2579 u32 fwd_seq;
2f2dc053
SW		 2580 int err = -EINVAL;
2581 void *p = msg->front.iov_base;
2582 void *end = p + msg->front.iov_len;
2f2dc053 2583
a1ea787c 2584 ceph_decode_need(&p, end, 2*sizeof(u32), bad);
c89136ea
SW		 2585 next_mds = ceph_decode_32(&p);
2586 fwd_seq = ceph_decode_32(&p);
2f2dc053
SW		 2587
2588 mutex_lock(&mdsc->mutex);
fcd00b68 2589 req = lookup_get_request(mdsc, tid);
2f2dc053 2590 if (!req) {
2a8e5e36 2591 dout("forward tid %llu to mds%d - req dne\n", tid, next_mds);
2f2dc053
SW		 2592 goto out; /* dup reply? */
2593 }
2594
2a8e5e36
SW		 2595 if (req->r_aborted) {
2596 dout("forward tid %llu aborted, unregistering\n", tid);
2597 __unregister_request(mdsc, req);
2598 } else if (fwd_seq <= req->r_num_fwd) {
2599 dout("forward tid %llu to mds%d - old seq %d <= %d\n",
2f2dc053
SW		 2600 tid, next_mds, req->r_num_fwd, fwd_seq);
2601 } else {
2602 /* resend. forward race not possible; mds would drop */
2a8e5e36
SW		 2603 dout("forward tid %llu to mds%d (we resend)\n", tid, next_mds);
2604 BUG_ON(req->r_err);
2605 BUG_ON(req->r_got_result);
3de22be6 2606 req->r_attempts = 0;
2f2dc053
SW		 2607 req->r_num_fwd = fwd_seq;
2608 req->r_resend_mds = next_mds;
2609 put_request_session(req);
2610 __do_request(mdsc, req);
2611 }
2612 ceph_mdsc_put_request(req);
2613out:
2614 mutex_unlock(&mdsc->mutex);
2615 return;
2616
2617bad:
2618 pr_err("mdsc_handle_forward decode error err=%d\n", err);
2619}
2620
2621/*
2622 * handle a mds session control message
2623 */
2624static void handle_session(struct ceph_mds_session *session,
2625 struct ceph_msg *msg)
2626{
2627 struct ceph_mds_client *mdsc = session->s_mdsc;
2628 u32 op;
2629 u64 seq;
2600d2dd 2630 int mds = session->s_mds;
2f2dc053
SW		 2631 struct ceph_mds_session_head *h = msg->front.iov_base;
2632 int wake = 0;
2633
2f2dc053
SW		 2634 /* decode */
2635 if (msg->front.iov_len != sizeof(*h))
2636 goto bad;
2637 op = le32_to_cpu(h->op);
2638 seq = le64_to_cpu(h->seq);
2639
2640 mutex_lock(&mdsc->mutex);
2600d2dd
SW		 2641 if (op == CEPH_SESSION_CLOSE)
2642 __unregister_session(mdsc, session);
2f2dc053
SW		 2643 /* FIXME: this ttl calculation is generous */
2644 session->s_ttl = jiffies + HZ*mdsc->mdsmap->m_session_autoclose;
2645 mutex_unlock(&mdsc->mutex);
2646
2647 mutex_lock(&session->s_mutex);
2648
2649 dout("handle_session mds%d %s %p state %s seq %llu\n",
2650 mds, ceph_session_op_name(op), session,
a687ecaf 2651 ceph_session_state_name(session->s_state), seq);
2f2dc053
SW		 2652
2653 if (session->s_state == CEPH_MDS_SESSION_HUNG) {
2654 session->s_state = CEPH_MDS_SESSION_OPEN;
2655 pr_info("mds%d came back\n", session->s_mds);
2656 }
2657
2658 switch (op) {
2659 case CEPH_SESSION_OPEN:
29790f26
SW		 2660 if (session->s_state == CEPH_MDS_SESSION_RECONNECTING)
2661 pr_info("mds%d reconnect success\n", session->s_mds);
2f2dc053
SW		 2662 session->s_state = CEPH_MDS_SESSION_OPEN;
2663 renewed_caps(mdsc, session, 0);
2664 wake = 1;
2665 if (mdsc->stopping)
2666 __close_session(mdsc, session);
2667 break;
2668
2669 case CEPH_SESSION_RENEWCAPS:
2670 if (session->s_renew_seq == seq)
2671 renewed_caps(mdsc, session, 1);
2672 break;
2673
2674 case CEPH_SESSION_CLOSE:
29790f26
SW		 2675 if (session->s_state == CEPH_MDS_SESSION_RECONNECTING)
2676 pr_info("mds%d reconnect denied\n", session->s_mds);
1c841a96 2677 cleanup_session_requests(mdsc, session);
2f2dc053 2678 remove_session_caps(session);
656e4382 2679 wake = 2; /* for good measure */
f3c60c59 2680 wake_up_all(&mdsc->session_close_wq);
2f2dc053
SW		 2681 break;
2682
2683 case CEPH_SESSION_STALE:
2684 pr_info("mds%d caps went stale, renewing\n",
2685 session->s_mds);
d8fb02ab 2686 spin_lock(&session->s_gen_ttl_lock);
2f2dc053 2687 session->s_cap_gen++;
1ce208a6 2688 session->s_cap_ttl = jiffies - 1;
d8fb02ab 2689 spin_unlock(&session->s_gen_ttl_lock);
2f2dc053
SW		 2690 send_renew_caps(mdsc, session);
2691 break;
2692
2693 case CEPH_SESSION_RECALL_STATE:
2694 trim_caps(mdsc, session, le32_to_cpu(h->max_caps));
2695 break;
2696
186e4f7a
YZ		 2697 case CEPH_SESSION_FLUSHMSG:
2698 send_flushmsg_ack(mdsc, session, seq);
2699 break;
2700
03f4fcb0
YZ		 2701 case CEPH_SESSION_FORCE_RO:
2702 dout("force_session_readonly %p\n", session);
2703 spin_lock(&session->s_cap_lock);
2704 session->s_readonly = true;
2705 spin_unlock(&session->s_cap_lock);
2706 wake_up_session_caps(session, 0);
2707 break;
2708
2f2dc053
SW		 2709 default:
2710 pr_err("mdsc_handle_session bad op %d mds%d\n", op, mds);
2711 WARN_ON(1);
2712 }
2713
2714 mutex_unlock(&session->s_mutex);
2715 if (wake) {
2716 mutex_lock(&mdsc->mutex);
2717 __wake_requests(mdsc, &session->s_waiting);
656e4382
YZ		 2718 if (wake == 2)
2719 kick_requests(mdsc, mds);
2f2dc053
SW		 2720 mutex_unlock(&mdsc->mutex);
2721 }
2722 return;
2723
2724bad:
2725 pr_err("mdsc_handle_session corrupt message mds%d len %d\n", mds,
2726 (int)msg->front.iov_len);
9ec7cab1 2727 ceph_msg_dump(msg);
2f2dc053
SW		 2728 return;
2729}
2730
2731
2732/*
2733 * called under session->mutex.
2734 */
2735static void replay_unsafe_requests(struct ceph_mds_client *mdsc,
2736 struct ceph_mds_session *session)
2737{
2738 struct ceph_mds_request *req, *nreq;
3de22be6 2739 struct rb_node *p;
2f2dc053
SW		 2740 int err;
2741
2742 dout("replay_unsafe_requests mds%d\n", session->s_mds);
2743
2744 mutex_lock(&mdsc->mutex);
2745 list_for_each_entry_safe(req, nreq, &session->s_unsafe, r_unsafe_item) {
6e6f0923 2746 err = __prepare_send_request(mdsc, req, session->s_mds, true);
2f2dc053
SW		 2747 if (!err) {
2748 ceph_msg_get(req->r_request);
2749 ceph_con_send(&session->s_con, req->r_request);
2750 }
2751 }
3de22be6
YZ		 2752
2753 /*
2754 * also re-send old requests when MDS enters reconnect stage. So that MDS
2755 * can process completed request in clientreplay stage.
2756 */
2757 p = rb_first(&mdsc->request_tree);
2758 while (p) {
2759 req = rb_entry(p, struct ceph_mds_request, r_node);
2760 p = rb_next(p);
2761 if (req->r_got_unsafe)
2762 continue;
2763 if (req->r_attempts == 0)
2764 continue; /* only old requests */
2765 if (req->r_session &&
2766 req->r_session->s_mds == session->s_mds) {
6e6f0923
YZ		 2767 err = __prepare_send_request(mdsc, req,
2768 session->s_mds, true);
3de22be6
YZ		 2769 if (!err) {
2770 ceph_msg_get(req->r_request);
2771 ceph_con_send(&session->s_con, req->r_request);
2772 }
2773 }
2774 }
2f2dc053
SW		 2775 mutex_unlock(&mdsc->mutex);
2776}
2777
2778/*
2779 * Encode information about a cap for a reconnect with the MDS.
2780 */
2f2dc053
SW		 2781static int encode_caps_cb(struct inode *inode, struct ceph_cap *cap,
2782 void *arg)
2783{
20cb34ae
SW		 2784 union {
2785 struct ceph_mds_cap_reconnect v2;
2786 struct ceph_mds_cap_reconnect_v1 v1;
2787 } rec;
2788 size_t reclen;
2f2dc053 2789 struct ceph_inode_info *ci;
20cb34ae
SW		 2790 struct ceph_reconnect_state *recon_state = arg;
2791 struct ceph_pagelist *pagelist = recon_state->pagelist;
2f2dc053
SW		 2792 char *path;
2793 int pathlen, err;
2794 u64 pathbase;
2795 struct dentry *dentry;
2796
2797 ci = cap->ci;
2798
2799 dout(" adding %p ino %llx.%llx cap %p %lld %s\n",
2800 inode, ceph_vinop(inode), cap, cap->cap_id,
2801 ceph_cap_string(cap->issued));
93cea5be
SW		 2802 err = ceph_pagelist_encode_64(pagelist, ceph_ino(inode));
2803 if (err)
2804 return err;
2f2dc053
SW		 2805
2806 dentry = d_find_alias(inode);
2807 if (dentry) {
2808 path = ceph_mdsc_build_path(dentry, &pathlen, &pathbase, 0);
2809 if (IS_ERR(path)) {
2810 err = PTR_ERR(path);
e072f8aa 2811 goto out_dput;
2f2dc053
SW		 2812 }
2813 } else {
2814 path = NULL;
2815 pathlen = 0;
2816 }
93cea5be
SW		 2817 err = ceph_pagelist_encode_string(pagelist, path, pathlen);
2818 if (err)
e072f8aa 2819 goto out_free;
2f2dc053 2820
be655596 2821 spin_lock(&ci->i_ceph_lock);
2f2dc053
SW		 2822 cap->seq = 0; /* reset cap seq */
2823 cap->issue_seq = 0; /* and issue_seq */
667ca05c 2824 cap->mseq = 0; /* and migrate_seq */
99a9c273 2825 cap->cap_gen = cap->session->s_cap_gen;
20cb34ae
SW		 2826
2827 if (recon_state->flock) {
2828 rec.v2.cap_id = cpu_to_le64(cap->cap_id);
2829 rec.v2.wanted = cpu_to_le32(__ceph_caps_wanted(ci));
2830 rec.v2.issued = cpu_to_le32(cap->issued);
2831 rec.v2.snaprealm = cpu_to_le64(ci->i_snap_realm->ino);
2832 rec.v2.pathbase = cpu_to_le64(pathbase);
2833 rec.v2.flock_len = 0;
2834 reclen = sizeof(rec.v2);
2835 } else {
2836 rec.v1.cap_id = cpu_to_le64(cap->cap_id);
2837 rec.v1.wanted = cpu_to_le32(__ceph_caps_wanted(ci));
2838 rec.v1.issued = cpu_to_le32(cap->issued);
2839 rec.v1.size = cpu_to_le64(inode->i_size);
2840 ceph_encode_timespec(&rec.v1.mtime, &inode->i_mtime);
2841 ceph_encode_timespec(&rec.v1.atime, &inode->i_atime);
2842 rec.v1.snaprealm = cpu_to_le64(ci->i_snap_realm->ino);
2843 rec.v1.pathbase = cpu_to_le64(pathbase);
2844 reclen = sizeof(rec.v1);
2845 }
be655596 2846 spin_unlock(&ci->i_ceph_lock);
2f2dc053 2847
40819f6f
GF		 2848 if (recon_state->flock) {
2849 int num_fcntl_locks, num_flock_locks;
39be95e9
JS		 2850 struct ceph_filelock *flocks;
2851
2852encode_again:
39be95e9 2853 ceph_count_locks(inode, &num_fcntl_locks, &num_flock_locks);
39be95e9
JS		 2854 flocks = kmalloc((num_fcntl_locks+num_flock_locks) *
2855 sizeof(struct ceph_filelock), GFP_NOFS);
2856 if (!flocks) {
2857 err = -ENOMEM;
2858 goto out_free;
2859 }
39be95e9
JS		 2860 err = ceph_encode_locks_to_buffer(inode, flocks,
2861 num_fcntl_locks,
2862 num_flock_locks);
39be95e9
JS		 2863 if (err) {
2864 kfree(flocks);
2865 if (err == -ENOSPC)
2866 goto encode_again;
2867 goto out_free;
2868 }
2869 /*
2870 * number of encoded locks is stable, so copy to pagelist
2871 */
2872 rec.v2.flock_len = cpu_to_le32(2*sizeof(u32) +
2873 (num_fcntl_locks+num_flock_locks) *
2874 sizeof(struct ceph_filelock));
2875 err = ceph_pagelist_append(pagelist, &rec, reclen);
2876 if (!err)
2877 err = ceph_locks_to_pagelist(flocks, pagelist,
2878 num_fcntl_locks,
2879 num_flock_locks);
2880 kfree(flocks);
3612abbd
SW		 2881 } else {
2882 err = ceph_pagelist_append(pagelist, &rec, reclen);
40819f6f 2883 }
44c99757
YZ		 2884
2885 recon_state->nr_caps++;
e072f8aa 2886out_free:
2f2dc053 2887 kfree(path);
e072f8aa 2888out_dput:
2f2dc053 2889 dput(dentry);
93cea5be 2890 return err;
2f2dc053
SW		 2891}
2892
2893
2894/*
2895 * If an MDS fails and recovers, clients need to reconnect in order to
2896 * reestablish shared state. This includes all caps issued through
2897 * this session _and_ the snap_realm hierarchy. Because it's not
2898 * clear which snap realms the mds cares about, we send everything we
2899 * know about.. that ensures we'll then get any new info the
2900 * recovering MDS might have.
2901 *
2902 * This is a relatively heavyweight operation, but it's rare.
2903 *
2904 * called with mdsc->mutex held.
2905 */
34b6c855
SW		 2906static void send_mds_reconnect(struct ceph_mds_client *mdsc,
2907 struct ceph_mds_session *session)
2f2dc053 2908{
2f2dc053 2909 struct ceph_msg *reply;
a105f00c 2910 struct rb_node *p;
34b6c855 2911 int mds = session->s_mds;
9abf82b8 2912 int err = -ENOMEM;
44c99757 2913 int s_nr_caps;
93cea5be 2914 struct ceph_pagelist *pagelist;
20cb34ae 2915 struct ceph_reconnect_state recon_state;
2f2dc053 2916
34b6c855 2917 pr_info("mds%d reconnect start\n", mds);
2f2dc053 2918
93cea5be
SW		 2919 pagelist = kmalloc(sizeof(*pagelist), GFP_NOFS);
2920 if (!pagelist)
2921 goto fail_nopagelist;
2922 ceph_pagelist_init(pagelist);
2923
b61c2763 2924 reply = ceph_msg_new(CEPH_MSG_CLIENT_RECONNECT, 0, GFP_NOFS, false);
a79832f2 2925 if (!reply)
93cea5be 2926 goto fail_nomsg;
93cea5be 2927
34b6c855
SW		 2928 mutex_lock(&session->s_mutex);
2929 session->s_state = CEPH_MDS_SESSION_RECONNECTING;
2930 session->s_seq = 0;
2f2dc053 2931
2f2dc053 2932 dout("session %p state %s\n", session,
a687ecaf 2933 ceph_session_state_name(session->s_state));
2f2dc053 2934
99a9c273
YZ		 2935 spin_lock(&session->s_gen_ttl_lock);
2936 session->s_cap_gen++;
2937 spin_unlock(&session->s_gen_ttl_lock);
2938
2939 spin_lock(&session->s_cap_lock);
03f4fcb0
YZ		 2940 /* don't know if session is readonly */
2941 session->s_readonly = 0;
99a9c273
YZ		 2942 /*
2943 * notify __ceph_remove_cap() that we are composing cap reconnect.
2944 * If a cap get released before being added to the cap reconnect,
2945 * __ceph_remove_cap() should skip queuing cap release.
2946 */
2947 session->s_cap_reconnect = 1;
e01a5946 2948 /* drop old cap expires; we're about to reestablish that state */
745a8e3b 2949 cleanup_cap_releases(mdsc, session);
e01a5946 2950
5d23371f 2951 /* trim unused caps to reduce MDS's cache rejoin time */
c0bd50e2
YZ		 2952 if (mdsc->fsc->sb->s_root)
2953 shrink_dcache_parent(mdsc->fsc->sb->s_root);
5d23371f
YZ		 2954
2955 ceph_con_close(&session->s_con);
2956 ceph_con_open(&session->s_con,
2957 CEPH_ENTITY_TYPE_MDS, mds,
2958 ceph_mdsmap_get_addr(mdsc->mdsmap, mds));
2959
2960 /* replay unsafe requests */
2961 replay_unsafe_requests(mdsc, session);
2962
2963 down_read(&mdsc->snap_rwsem);
2964
2f2dc053 2965 /* traverse this session's caps */
44c99757
YZ		 2966 s_nr_caps = session->s_nr_caps;
2967 err = ceph_pagelist_encode_32(pagelist, s_nr_caps);
93cea5be
SW		 2968 if (err)
2969 goto fail;
20cb34ae 2970
44c99757 2971 recon_state.nr_caps = 0;
20cb34ae
SW		 2972 recon_state.pagelist = pagelist;
2973 recon_state.flock = session->s_con.peer_features & CEPH_FEATURE_FLOCK;
2974 err = iterate_session_caps(session, encode_caps_cb, &recon_state);
2f2dc053 2975 if (err < 0)
9abf82b8 2976 goto fail;
2f2dc053 2977
99a9c273
YZ		 2978 spin_lock(&session->s_cap_lock);
2979 session->s_cap_reconnect = 0;
2980 spin_unlock(&session->s_cap_lock);
2981
2f2dc053
SW		 2982 /*
2983 * snaprealms. we provide mds with the ino, seq (version), and
2984 * parent for all of our realms. If the mds has any newer info,
2985 * it will tell us.
2986 */
a105f00c
SW		 2987 for (p = rb_first(&mdsc->snap_realms); p; p = rb_next(p)) {
2988 struct ceph_snap_realm *realm =
2989 rb_entry(p, struct ceph_snap_realm, node);
93cea5be 2990 struct ceph_mds_snaprealm_reconnect sr_rec;
2f2dc053
SW		 2991
2992 dout(" adding snap realm %llx seq %lld parent %llx\n",
2993 realm->ino, realm->seq, realm->parent_ino);
93cea5be
SW		 2994 sr_rec.ino = cpu_to_le64(realm->ino);
2995 sr_rec.seq = cpu_to_le64(realm->seq);
2996 sr_rec.parent = cpu_to_le64(realm->parent_ino);
2997 err = ceph_pagelist_append(pagelist, &sr_rec, sizeof(sr_rec));
2998 if (err)
2999 goto fail;
2f2dc053 3000 }
2f2dc053 3001
20cb34ae
SW		 3002 if (recon_state.flock)
3003 reply->hdr.version = cpu_to_le16(2);
44c99757
YZ		 3004
3005 /* raced with cap release? */
3006 if (s_nr_caps != recon_state.nr_caps) {
3007 struct page *page = list_first_entry(&pagelist->head,
3008 struct page, lru);
3009 __le32 *addr = kmap_atomic(page);
3010 *addr = cpu_to_le32(recon_state.nr_caps);
3011 kunmap_atomic(addr);
ebf18f47 3012 }
44c99757
YZ		 3013
3014 reply->hdr.data_len = cpu_to_le32(pagelist->length);
3015 ceph_msg_data_add_pagelist(reply, pagelist);
e548e9b9
YZ		 3016
3017 ceph_early_kick_flushing_caps(mdsc, session);
3018
2f2dc053
SW		 3019 ceph_con_send(&session->s_con, reply);
3020
9abf82b8
SW		 3021 mutex_unlock(&session->s_mutex);
3022
3023 mutex_lock(&mdsc->mutex);
3024 __wake_requests(mdsc, &session->s_waiting);
3025 mutex_unlock(&mdsc->mutex);
3026
2f2dc053 3027 up_read(&mdsc->snap_rwsem);
2f2dc053
SW		 3028 return;
3029
93cea5be 3030fail:
2f2dc053 3031 ceph_msg_put(reply);
9abf82b8
SW		 3032 up_read(&mdsc->snap_rwsem);
3033 mutex_unlock(&session->s_mutex);
93cea5be
SW		 3034fail_nomsg:
3035 ceph_pagelist_release(pagelist);
93cea5be 3036fail_nopagelist:
9abf82b8 3037 pr_err("error %d preparing reconnect for mds%d\n", err, mds);
9abf82b8 3038 return;
2f2dc053
SW		 3039}
3040
3041
3042/*
3043 * compare old and new mdsmaps, kicking requests
3044 * and closing out old connections as necessary
3045 *
3046 * called under mdsc->mutex.
3047 */
3048static void check_new_map(struct ceph_mds_client *mdsc,
3049 struct ceph_mdsmap *newmap,
3050 struct ceph_mdsmap *oldmap)
3051{
3052 int i;
3053 int oldstate, newstate;
3054 struct ceph_mds_session *s;
3055
3056 dout("check_new_map new %u old %u\n",
3057 newmap->m_epoch, oldmap->m_epoch);
3058
3059 for (i = 0; i < oldmap->m_max_mds && i < mdsc->max_sessions; i++) {
3060 if (mdsc->sessions[i] == NULL)
3061 continue;
3062 s = mdsc->sessions[i];
3063 oldstate = ceph_mdsmap_get_state(oldmap, i);
3064 newstate = ceph_mdsmap_get_state(newmap, i);
3065
0deb01c9 3066 dout("check_new_map mds%d state %s%s -> %s%s (session %s)\n",
2f2dc053 3067 i, ceph_mds_state_name(oldstate),
0deb01c9 3068 ceph_mdsmap_is_laggy(oldmap, i) ? " (laggy)" : "",
2f2dc053 3069 ceph_mds_state_name(newstate),
0deb01c9 3070 ceph_mdsmap_is_laggy(newmap, i) ? " (laggy)" : "",
a687ecaf 3071 ceph_session_state_name(s->s_state));
2f2dc053 3072
3e8f43a0
YZ		 3073 if (i >= newmap->m_max_mds ||
3074 memcmp(ceph_mdsmap_get_addr(oldmap, i),
2f2dc053
SW		 3075 ceph_mdsmap_get_addr(newmap, i),
3076 sizeof(struct ceph_entity_addr))) {
3077 if (s->s_state == CEPH_MDS_SESSION_OPENING) {
3078 /* the session never opened, just close it
3079 * out now */
3080 __wake_requests(mdsc, &s->s_waiting);
2600d2dd 3081 __unregister_session(mdsc, s);
2f2dc053
SW		 3082 } else {
3083 /* just close it */
3084 mutex_unlock(&mdsc->mutex);
3085 mutex_lock(&s->s_mutex);
3086 mutex_lock(&mdsc->mutex);
3087 ceph_con_close(&s->s_con);
3088 mutex_unlock(&s->s_mutex);
3089 s->s_state = CEPH_MDS_SESSION_RESTARTING;
3090 }
2f2dc053
SW		 3091 } else if (oldstate == newstate) {
3092 continue; /* nothing new with this mds */
3093 }
3094
3095 /*
3096 * send reconnect?
3097 */
3098 if (s->s_state == CEPH_MDS_SESSION_RESTARTING &&
34b6c855
SW		 3099 newstate >= CEPH_MDS_STATE_RECONNECT) {
3100 mutex_unlock(&mdsc->mutex);
3101 send_mds_reconnect(mdsc, s);
3102 mutex_lock(&mdsc->mutex);
3103 }
2f2dc053
SW		 3104
3105 /*
29790f26 3106 * kick request on any mds that has gone active.
2f2dc053
SW		 3107 */
3108 if (oldstate < CEPH_MDS_STATE_ACTIVE &&
3109 newstate >= CEPH_MDS_STATE_ACTIVE) {
29790f26
SW		 3110 if (oldstate != CEPH_MDS_STATE_CREATING &&
3111 oldstate != CEPH_MDS_STATE_STARTING)
3112 pr_info("mds%d recovery completed\n", s->s_mds);
3113 kick_requests(mdsc, i);
2f2dc053 3114 ceph_kick_flushing_caps(mdsc, s);
0dc2570f 3115 wake_up_session_caps(s, 1);
2f2dc053
SW		 3116 }
3117 }
cb170a22
SW		 3118
3119 for (i = 0; i < newmap->m_max_mds && i < mdsc->max_sessions; i++) {
3120 s = mdsc->sessions[i];
3121 if (!s)
3122 continue;
3123 if (!ceph_mdsmap_is_laggy(newmap, i))
3124 continue;
3125 if (s->s_state == CEPH_MDS_SESSION_OPEN ||
3126 s->s_state == CEPH_MDS_SESSION_HUNG ||
3127 s->s_state == CEPH_MDS_SESSION_CLOSING) {
3128 dout(" connecting to export targets of laggy mds%d\n",
3129 i);
3130 __open_export_target_sessions(mdsc, s);
3131 }
3132 }
2f2dc053
SW		 3133}
3134
3135
3136
3137/*
3138 * leases
3139 */
3140
3141/*
3142 * caller must hold session s_mutex, dentry->d_lock
3143 */
3144void __ceph_mdsc_drop_dentry_lease(struct dentry *dentry)
3145{
3146 struct ceph_dentry_info *di = ceph_dentry(dentry);
3147
3148 ceph_put_mds_session(di->lease_session);
3149 di->lease_session = NULL;
3150}
3151
2600d2dd
SW		 3152static void handle_lease(struct ceph_mds_client *mdsc,
3153 struct ceph_mds_session *session,
3154 struct ceph_msg *msg)
2f2dc053 3155{
3d14c5d2 3156 struct super_block *sb = mdsc->fsc->sb;
2f2dc053 3157 struct inode *inode;
2f2dc053
SW		 3158 struct dentry *parent, *dentry;
3159 struct ceph_dentry_info *di;
2600d2dd 3160 int mds = session->s_mds;
2f2dc053 3161 struct ceph_mds_lease *h = msg->front.iov_base;
1e5ea23d 3162 u32 seq;
2f2dc053 3163 struct ceph_vino vino;
2f2dc053
SW		 3164 struct qstr dname;
3165 int release = 0;
3166
2f2dc053
SW		 3167 dout("handle_lease from mds%d\n", mds);
3168
3169 /* decode */
3170 if (msg->front.iov_len < sizeof(*h) + sizeof(u32))
3171 goto bad;
3172 vino.ino = le64_to_cpu(h->ino);
3173 vino.snap = CEPH_NOSNAP;
1e5ea23d 3174 seq = le32_to_cpu(h->seq);
2f2dc053
SW		 3175 dname.name = (void *)h + sizeof(*h) + sizeof(u32);
3176 dname.len = msg->front.iov_len - sizeof(*h) - sizeof(u32);
3177 if (dname.len != get_unaligned_le32(h+1))
3178 goto bad;
3179
2f2dc053
SW		 3180 /* lookup inode */
3181 inode = ceph_find_inode(sb, vino);
2f90b852
SW		 3182 dout("handle_lease %s, ino %llx %p %.*s\n",
3183 ceph_lease_op_name(h->action), vino.ino, inode,
1e5ea23d 3184 dname.len, dname.name);
6cd3bcad
YZ		 3185
3186 mutex_lock(&session->s_mutex);
3187 session->s_seq++;
3188
2f2dc053
SW		 3189 if (inode == NULL) {
3190 dout("handle_lease no inode %llx\n", vino.ino);
3191 goto release;
3192 }
2f2dc053
SW		 3193
3194 /* dentry */
3195 parent = d_find_alias(inode);
3196 if (!parent) {
3197 dout("no parent dentry on inode %p\n", inode);
3198 WARN_ON(1);
3199 goto release; /* hrm... */
3200 }
3201 dname.hash = full_name_hash(dname.name, dname.len);
3202 dentry = d_lookup(parent, &dname);
3203 dput(parent);
3204 if (!dentry)
3205 goto release;
3206
3207 spin_lock(&dentry->d_lock);
3208 di = ceph_dentry(dentry);
3209 switch (h->action) {
3210 case CEPH_MDS_LEASE_REVOKE:
3d8eb7a9 3211 if (di->lease_session == session) {
1e5ea23d
SW		 3212 if (ceph_seq_cmp(di->lease_seq, seq) > 0)
3213 h->seq = cpu_to_le32(di->lease_seq);
2f2dc053
SW		 3214 __ceph_mdsc_drop_dentry_lease(dentry);
3215 }
3216 release = 1;
3217 break;
3218
3219 case CEPH_MDS_LEASE_RENEW:
3d8eb7a9 3220 if (di->lease_session == session &&
2f2dc053
SW		 3221 di->lease_gen == session->s_cap_gen &&
3222 di->lease_renew_from &&
3223 di->lease_renew_after == 0) {
3224 unsigned long duration =
3563dbdd 3225 msecs_to_jiffies(le32_to_cpu(h->duration_ms));
2f2dc053 3226
1e5ea23d 3227 di->lease_seq = seq;
2f2dc053
SW		 3228 dentry->d_time = di->lease_renew_from + duration;
3229 di->lease_renew_after = di->lease_renew_from +
3230 (duration >> 1);
3231 di->lease_renew_from = 0;
3232 }
3233 break;
3234 }
3235 spin_unlock(&dentry->d_lock);
3236 dput(dentry);
3237
3238 if (!release)
3239 goto out;
3240
3241release:
3242 /* let's just reuse the same message */
3243 h->action = CEPH_MDS_LEASE_REVOKE_ACK;
3244 ceph_msg_get(msg);
3245 ceph_con_send(&session->s_con, msg);
3246
3247out:
3248 iput(inode);
3249 mutex_unlock(&session->s_mutex);
2f2dc053
SW		 3250 return;
3251
3252bad:
3253 pr_err("corrupt lease message\n");
9ec7cab1 3254 ceph_msg_dump(msg);
2f2dc053
SW		 3255}
3256
3257void ceph_mdsc_lease_send_msg(struct ceph_mds_session *session,
3258 struct inode *inode,
3259 struct dentry *dentry, char action,
3260 u32 seq)
3261{
3262 struct ceph_msg *msg;
3263 struct ceph_mds_lease *lease;
3264 int len = sizeof(*lease) + sizeof(u32);
3265 int dnamelen = 0;
3266
3267 dout("lease_send_msg inode %p dentry %p %s to mds%d\n",
3268 inode, dentry, ceph_lease_op_name(action), session->s_mds);
3269 dnamelen = dentry->d_name.len;
3270 len += dnamelen;
3271
b61c2763 3272 msg = ceph_msg_new(CEPH_MSG_CLIENT_LEASE, len, GFP_NOFS, false);
a79832f2 3273 if (!msg)
2f2dc053
SW		 3274 return;
3275 lease = msg->front.iov_base;
3276 lease->action = action;
2f2dc053
SW		 3277 lease->ino = cpu_to_le64(ceph_vino(inode).ino);
3278 lease->first = lease->last = cpu_to_le64(ceph_vino(inode).snap);
3279 lease->seq = cpu_to_le32(seq);
3280 put_unaligned_le32(dnamelen, lease + 1);
3281 memcpy((void *)(lease + 1) + 4, dentry->d_name.name, dnamelen);
3282
3283 /*
3284 * if this is a preemptive lease RELEASE, no need to
3285 * flush request stream, since the actual request will
3286 * soon follow.
3287 */
3288 msg->more_to_follow = (action == CEPH_MDS_LEASE_RELEASE);
3289
3290 ceph_con_send(&session->s_con, msg);
3291}
3292
3293/*
3294 * Preemptively release a lease we expect to invalidate anyway.
3295 * Pass @inode always, @dentry is optional.
3296 */
3297void ceph_mdsc_lease_release(struct ceph_mds_client *mdsc, struct inode *inode,
2f90b852 3298 struct dentry *dentry)
2f2dc053
SW		 3299{
3300 struct ceph_dentry_info *di;
3301 struct ceph_mds_session *session;
3302 u32 seq;
3303
3304 BUG_ON(inode == NULL);
3305 BUG_ON(dentry == NULL);
2f2dc053
SW		 3306
3307 /* is dentry lease valid? */
3308 spin_lock(&dentry->d_lock);
3309 di = ceph_dentry(dentry);
3310 if (!di || !di->lease_session ||
3311 di->lease_session->s_mds < 0 ||
3312 di->lease_gen != di->lease_session->s_cap_gen ||
3313 !time_before(jiffies, dentry->d_time)) {
3314 dout("lease_release inode %p dentry %p -- "
2f90b852
SW		 3315 "no lease\n",
3316 inode, dentry);
2f2dc053
SW		 3317 spin_unlock(&dentry->d_lock);
3318 return;
3319 }
3320
3321 /* we do have a lease on this dentry; note mds and seq */
3322 session = ceph_get_mds_session(di->lease_session);
3323 seq = di->lease_seq;
3324 __ceph_mdsc_drop_dentry_lease(dentry);
3325 spin_unlock(&dentry->d_lock);
3326
2f90b852
SW		 3327 dout("lease_release inode %p dentry %p to mds%d\n",
3328 inode, dentry, session->s_mds);
2f2dc053
SW		 3329 ceph_mdsc_lease_send_msg(session, inode, dentry,
3330 CEPH_MDS_LEASE_RELEASE, seq);
3331 ceph_put_mds_session(session);
3332}
3333
3334/*
3335 * drop all leases (and dentry refs) in preparation for umount
3336 */
3337static void drop_leases(struct ceph_mds_client *mdsc)
3338{
3339 int i;
3340
3341 dout("drop_leases\n");
3342 mutex_lock(&mdsc->mutex);
3343 for (i = 0; i < mdsc->max_sessions; i++) {
3344 struct ceph_mds_session *s = __ceph_lookup_mds_session(mdsc, i);
3345 if (!s)
3346 continue;
3347 mutex_unlock(&mdsc->mutex);
3348 mutex_lock(&s->s_mutex);
3349 mutex_unlock(&s->s_mutex);
3350 ceph_put_mds_session(s);
3351 mutex_lock(&mdsc->mutex);
3352 }
3353 mutex_unlock(&mdsc->mutex);
3354}
3355
3356
3357
3358/*
3359 * delayed work -- periodically trim expired leases, renew caps with mds
3360 */
3361static void schedule_delayed(struct ceph_mds_client *mdsc)
3362{
3363 int delay = 5;
3364 unsigned hz = round_jiffies_relative(HZ * delay);
3365 schedule_delayed_work(&mdsc->delayed_work, hz);
3366}
3367
3368static void delayed_work(struct work_struct *work)
3369{
3370 int i;
3371 struct ceph_mds_client *mdsc =
3372 container_of(work, struct ceph_mds_client, delayed_work.work);
3373 int renew_interval;
3374 int renew_caps;
3375
3376 dout("mdsc delayed_work\n");
afcdaea3 3377 ceph_check_delayed_caps(mdsc);
2f2dc053
SW		 3378
3379 mutex_lock(&mdsc->mutex);
3380 renew_interval = mdsc->mdsmap->m_session_timeout >> 2;
3381 renew_caps = time_after_eq(jiffies, HZ*renew_interval +
3382 mdsc->last_renew_caps);
3383 if (renew_caps)
3384 mdsc->last_renew_caps = jiffies;
3385
3386 for (i = 0; i < mdsc->max_sessions; i++) {
3387 struct ceph_mds_session *s = __ceph_lookup_mds_session(mdsc, i);
3388 if (s == NULL)
3389 continue;
3390 if (s->s_state == CEPH_MDS_SESSION_CLOSING) {
3391 dout("resending session close request for mds%d\n",
3392 s->s_mds);
3393 request_close_session(mdsc, s);
3394 ceph_put_mds_session(s);
3395 continue;
3396 }
3397 if (s->s_ttl && time_after(jiffies, s->s_ttl)) {
3398 if (s->s_state == CEPH_MDS_SESSION_OPEN) {
3399 s->s_state = CEPH_MDS_SESSION_HUNG;
3400 pr_info("mds%d hung\n", s->s_mds);
3401 }
3402 }
3403 if (s->s_state < CEPH_MDS_SESSION_OPEN) {
3404 /* this mds is failed or recovering, just wait */
3405 ceph_put_mds_session(s);
3406 continue;
3407 }
3408 mutex_unlock(&mdsc->mutex);
3409
3410 mutex_lock(&s->s_mutex);
3411 if (renew_caps)
3412 send_renew_caps(mdsc, s);
3413 else
3414 ceph_con_keepalive(&s->s_con);
aab53dd9
SW		 3415 if (s->s_state == CEPH_MDS_SESSION_OPEN ||
3416 s->s_state == CEPH_MDS_SESSION_HUNG)
3d7ded4d 3417 ceph_send_cap_releases(mdsc, s);
2f2dc053
SW		 3418 mutex_unlock(&s->s_mutex);
3419 ceph_put_mds_session(s);
3420
3421 mutex_lock(&mdsc->mutex);
3422 }
3423 mutex_unlock(&mdsc->mutex);
3424
3425 schedule_delayed(mdsc);
3426}
3427
3d14c5d2 3428int ceph_mdsc_init(struct ceph_fs_client *fsc)
2f2dc053 3429
2f2dc053 3430{
3d14c5d2
YS		 3431 struct ceph_mds_client *mdsc;
3432
3433 mdsc = kzalloc(sizeof(struct ceph_mds_client), GFP_NOFS);
3434 if (!mdsc)
3435 return -ENOMEM;
3436 mdsc->fsc = fsc;
3437 fsc->mdsc = mdsc;
2f2dc053
SW		 3438 mutex_init(&mdsc->mutex);
3439 mdsc->mdsmap = kzalloc(sizeof(*mdsc->mdsmap), GFP_NOFS);
fb3101b6 3440 if (mdsc->mdsmap == NULL) {
3441 kfree(mdsc);
2d06eeb8 3442 return -ENOMEM;
fb3101b6 3443 }
2d06eeb8 3444
2f2dc053 3445 init_completion(&mdsc->safe_umount_waiters);
f3c60c59 3446 init_waitqueue_head(&mdsc->session_close_wq);
2f2dc053
SW		 3447 INIT_LIST_HEAD(&mdsc->waiting_for_map);
3448 mdsc->sessions = NULL;
86d8f67b 3449 atomic_set(&mdsc->num_sessions, 0);
2f2dc053
SW		 3450 mdsc->max_sessions = 0;
3451 mdsc->stopping = 0;
affbc19a 3452 mdsc->last_snap_seq = 0;
2f2dc053 3453 init_rwsem(&mdsc->snap_rwsem);
a105f00c 3454 mdsc->snap_realms = RB_ROOT;
2f2dc053
SW		 3455 INIT_LIST_HEAD(&mdsc->snap_empty);
3456 spin_lock_init(&mdsc->snap_empty_lock);
3457 mdsc->last_tid = 0;
e8a7b8b1 3458 mdsc->oldest_tid = 0;
44ca18f2 3459 mdsc->request_tree = RB_ROOT;
2f2dc053
SW		 3460 INIT_DELAYED_WORK(&mdsc->delayed_work, delayed_work);
3461 mdsc->last_renew_caps = jiffies;
3462 INIT_LIST_HEAD(&mdsc->cap_delay_list);
3463 spin_lock_init(&mdsc->cap_delay_lock);
3464 INIT_LIST_HEAD(&mdsc->snap_flush_list);
3465 spin_lock_init(&mdsc->snap_flush_lock);
553adfd9 3466 mdsc->last_cap_flush_tid = 1;
8310b089 3467 mdsc->cap_flush_tree = RB_ROOT;
2f2dc053 3468 INIT_LIST_HEAD(&mdsc->cap_dirty);
db354052 3469 INIT_LIST_HEAD(&mdsc->cap_dirty_migrating);
2f2dc053
SW		 3470 mdsc->num_cap_flushing = 0;
3471 spin_lock_init(&mdsc->cap_dirty_lock);
3472 init_waitqueue_head(&mdsc->cap_flushing_wq);
3473 spin_lock_init(&mdsc->dentry_lru_lock);
3474 INIT_LIST_HEAD(&mdsc->dentry_lru);
2d06eeb8 3475
37151668 3476 ceph_caps_init(mdsc);
3d14c5d2 3477 ceph_adjust_min_caps(mdsc, fsc->min_caps);
37151668 3478
10183a69
YZ		 3479 init_rwsem(&mdsc->pool_perm_rwsem);
3480 mdsc->pool_perm_tree = RB_ROOT;
3481
5f44f142 3482 return 0;
2f2dc053
SW		 3483}
3484
3485/*
3486 * Wait for safe replies on open mds requests. If we time out, drop
3487 * all requests from the tree to avoid dangling dentry refs.
3488 */
3489static void wait_requests(struct ceph_mds_client *mdsc)
3490{
a319bf56 3491 struct ceph_options *opts = mdsc->fsc->client->options;
2f2dc053 3492 struct ceph_mds_request *req;
2f2dc053
SW		 3493
3494 mutex_lock(&mdsc->mutex);
44ca18f2 3495 if (__get_oldest_req(mdsc)) {
2f2dc053 3496 mutex_unlock(&mdsc->mutex);
44ca18f2 3497
2f2dc053
SW		 3498 dout("wait_requests waiting for requests\n");
3499 wait_for_completion_timeout(&mdsc->safe_umount_waiters,
a319bf56 3500 ceph_timeout_jiffies(opts->mount_timeout));
2f2dc053
SW		 3501
3502 /* tear down remaining requests */
44ca18f2
SW		 3503 mutex_lock(&mdsc->mutex);
3504 while ((req = __get_oldest_req(mdsc))) {
2f2dc053
SW		 3505 dout("wait_requests timed out on tid %llu\n",
3506 req->r_tid);
44ca18f2 3507 __unregister_request(mdsc, req);
2f2dc053
SW		 3508 }
3509 }
3510 mutex_unlock(&mdsc->mutex);
3511 dout("wait_requests done\n");
3512}
3513
3514/*
3515 * called before mount is ro, and before dentries are torn down.
3516 * (hmm, does this still race with new lookups?)
3517 */
3518void ceph_mdsc_pre_umount(struct ceph_mds_client *mdsc)
3519{
3520 dout("pre_umount\n");
3521 mdsc->stopping = 1;
3522
3523 drop_leases(mdsc);
afcdaea3 3524 ceph_flush_dirty_caps(mdsc);
2f2dc053 3525 wait_requests(mdsc);
17c688c3
SW		 3526
3527 /*
3528 * wait for reply handlers to drop their request refs and
3529 * their inode/dcache refs
3530 */
3531 ceph_msgr_flush();
2f2dc053
SW		 3532}
3533
3534/*
3535 * wait for all write mds requests to flush.
3536 */
3537static void wait_unsafe_requests(struct ceph_mds_client *mdsc, u64 want_tid)
3538{
80fc7314 3539 struct ceph_mds_request *req = NULL, *nextreq;
44ca18f2 3540 struct rb_node *n;
2f2dc053
SW		 3541
3542 mutex_lock(&mdsc->mutex);
3543 dout("wait_unsafe_requests want %lld\n", want_tid);
80fc7314 3544restart:
44ca18f2
SW		 3545 req = __get_oldest_req(mdsc);
3546 while (req && req->r_tid <= want_tid) {
80fc7314
SW		 3547 /* find next request */
3548 n = rb_next(&req->r_node);
3549 if (n)
3550 nextreq = rb_entry(n, struct ceph_mds_request, r_node);
3551 else
3552 nextreq = NULL;
e8a7b8b1
YZ		 3553 if (req->r_op != CEPH_MDS_OP_SETFILELOCK &&
3554 (req->r_op & CEPH_MDS_OP_WRITE)) {
44ca18f2
SW		 3555 /* write op */
3556 ceph_mdsc_get_request(req);
80fc7314
SW		 3557 if (nextreq)
3558 ceph_mdsc_get_request(nextreq);
44ca18f2
SW		 3559 mutex_unlock(&mdsc->mutex);
3560 dout("wait_unsafe_requests wait on %llu (want %llu)\n",
3561 req->r_tid, want_tid);
3562 wait_for_completion(&req->r_safe_completion);
3563 mutex_lock(&mdsc->mutex);
44ca18f2 3564 ceph_mdsc_put_request(req);
80fc7314
SW		 3565 if (!nextreq)
3566 break; /* next dne before, so we're done! */
3567 if (RB_EMPTY_NODE(&nextreq->r_node)) {
3568 /* next request was removed from tree */
3569 ceph_mdsc_put_request(nextreq);
3570 goto restart;
3571 }
3572 ceph_mdsc_put_request(nextreq); /* won't go away */
44ca18f2 3573 }
80fc7314 3574 req = nextreq;
2f2dc053
SW		 3575 }
3576 mutex_unlock(&mdsc->mutex);
3577 dout("wait_unsafe_requests done\n");
3578}
3579
3580void ceph_mdsc_sync(struct ceph_mds_client *mdsc)
3581{
affbc19a 3582 u64 want_tid, want_flush, want_snap;
2f2dc053 3583
48fec5d0 3584 if (ACCESS_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_SHUTDOWN)
56b7cf95
SW		 3585 return;
3586
2f2dc053
SW		 3587 dout("sync\n");
3588 mutex_lock(&mdsc->mutex);
3589 want_tid = mdsc->last_tid;
2f2dc053 3590 mutex_unlock(&mdsc->mutex);
2f2dc053 3591
afcdaea3 3592 ceph_flush_dirty_caps(mdsc);
d3383a8e 3593 spin_lock(&mdsc->cap_dirty_lock);
8310b089 3594 want_flush = mdsc->last_cap_flush_tid;
d3383a8e
YZ		 3595 spin_unlock(&mdsc->cap_dirty_lock);
3596
affbc19a
YZ		 3597 down_read(&mdsc->snap_rwsem);
3598 want_snap = mdsc->last_snap_seq;
3599 up_read(&mdsc->snap_rwsem);
3600
3601 dout("sync want tid %lld flush_seq %lld snap_seq %lld\n",
3602 want_tid, want_flush, want_snap);
2f2dc053
SW		 3603
3604 wait_unsafe_requests(mdsc, want_tid);
affbc19a 3605 wait_caps_flush(mdsc, want_flush, want_snap);
2f2dc053
SW		 3606}
3607
f3c60c59
SW		 3608/*
3609 * true if all sessions are closed, or we force unmount
3610 */
7fd7d101 3611static bool done_closing_sessions(struct ceph_mds_client *mdsc)
f3c60c59 3612{
48fec5d0 3613 if (ACCESS_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_SHUTDOWN)
f3c60c59 3614 return true;
86d8f67b 3615 return atomic_read(&mdsc->num_sessions) == 0;
f3c60c59 3616}
2f2dc053
SW		 3617
3618/*
3619 * called after sb is ro.
3620 */
3621void ceph_mdsc_close_sessions(struct ceph_mds_client *mdsc)
3622{
a319bf56 3623 struct ceph_options *opts = mdsc->fsc->client->options;
2f2dc053
SW		 3624 struct ceph_mds_session *session;
3625 int i;
2f2dc053
SW		 3626
3627 dout("close_sessions\n");
3628
2f2dc053 3629 /* close sessions */
f3c60c59
SW		 3630 mutex_lock(&mdsc->mutex);
3631 for (i = 0; i < mdsc->max_sessions; i++) {
3632 session = __ceph_lookup_mds_session(mdsc, i);
3633 if (!session)
3634 continue;
2f2dc053 3635 mutex_unlock(&mdsc->mutex);
f3c60c59
SW		 3636 mutex_lock(&session->s_mutex);
3637 __close_session(mdsc, session);
3638 mutex_unlock(&session->s_mutex);
3639 ceph_put_mds_session(session);
2f2dc053
SW		 3640 mutex_lock(&mdsc->mutex);
3641 }
f3c60c59
SW		 3642 mutex_unlock(&mdsc->mutex);
3643
3644 dout("waiting for sessions to close\n");
3645 wait_event_timeout(mdsc->session_close_wq, done_closing_sessions(mdsc),
a319bf56 3646 ceph_timeout_jiffies(opts->mount_timeout));
2f2dc053
SW		 3647
3648 /* tear down remaining sessions */
f3c60c59 3649 mutex_lock(&mdsc->mutex);
2f2dc053
SW		 3650 for (i = 0; i < mdsc->max_sessions; i++) {
3651 if (mdsc->sessions[i]) {
3652 session = get_session(mdsc->sessions[i]);
2600d2dd 3653 __unregister_session(mdsc, session);
2f2dc053
SW		 3654 mutex_unlock(&mdsc->mutex);
3655 mutex_lock(&session->s_mutex);
3656 remove_session_caps(session);
3657 mutex_unlock(&session->s_mutex);
3658 ceph_put_mds_session(session);
3659 mutex_lock(&mdsc->mutex);
3660 }
3661 }
2f2dc053 3662 WARN_ON(!list_empty(&mdsc->cap_delay_list));
2f2dc053
SW		 3663 mutex_unlock(&mdsc->mutex);
3664
3665 ceph_cleanup_empty_realms(mdsc);
3666
3667 cancel_delayed_work_sync(&mdsc->delayed_work); /* cancel timer */
3668
3669 dout("stopped\n");
3670}
3671
48fec5d0
YZ		 3672void ceph_mdsc_force_umount(struct ceph_mds_client *mdsc)
3673{
3674 struct ceph_mds_session *session;
3675 int mds;
3676
3677 dout("force umount\n");
3678
3679 mutex_lock(&mdsc->mutex);
3680 for (mds = 0; mds < mdsc->max_sessions; mds++) {
3681 session = __ceph_lookup_mds_session(mdsc, mds);
3682 if (!session)
3683 continue;
3684 mutex_unlock(&mdsc->mutex);
3685 mutex_lock(&session->s_mutex);
3686 __close_session(mdsc, session);
3687 if (session->s_state == CEPH_MDS_SESSION_CLOSING) {
3688 cleanup_session_requests(mdsc, session);
3689 remove_session_caps(session);
3690 }
3691 mutex_unlock(&session->s_mutex);
3692 ceph_put_mds_session(session);
3693 mutex_lock(&mdsc->mutex);
3694 kick_requests(mdsc, mds);
3695 }
3696 __wake_requests(mdsc, &mdsc->waiting_for_map);
3697 mutex_unlock(&mdsc->mutex);
3698}
3699
3d14c5d2 3700static void ceph_mdsc_stop(struct ceph_mds_client *mdsc)
2f2dc053
SW		 3701{
3702 dout("stop\n");
3703 cancel_delayed_work_sync(&mdsc->delayed_work); /* cancel timer */
3704 if (mdsc->mdsmap)
3705 ceph_mdsmap_destroy(mdsc->mdsmap);
3706 kfree(mdsc->sessions);
37151668 3707 ceph_caps_finalize(mdsc);
10183a69 3708 ceph_pool_perm_destroy(mdsc);
2f2dc053
SW		 3709}
3710
3d14c5d2
YS		 3711void ceph_mdsc_destroy(struct ceph_fs_client *fsc)
3712{
3713 struct ceph_mds_client *mdsc = fsc->mdsc;
3714
ef550f6f 3715 dout("mdsc_destroy %p\n", mdsc);
3d14c5d2 3716 ceph_mdsc_stop(mdsc);
ef550f6f
SW		 3717
3718 /* flush out any connection work with references to us */
3719 ceph_msgr_flush();
3720
3d14c5d2
YS		 3721 fsc->mdsc = NULL;
3722 kfree(mdsc);
ef550f6f 3723 dout("mdsc_destroy %p done\n", mdsc);
3d14c5d2
YS		 3724}
3725
2f2dc053
SW		 3726
3727/*
3728 * handle mds map update.
3729 */
3730void ceph_mdsc_handle_map(struct ceph_mds_client *mdsc, struct ceph_msg *msg)
3731{
3732 u32 epoch;
3733 u32 maplen;
3734 void *p = msg->front.iov_base;
3735 void *end = p + msg->front.iov_len;
3736 struct ceph_mdsmap *newmap, *oldmap;
3737 struct ceph_fsid fsid;
3738 int err = -EINVAL;
3739
3740 ceph_decode_need(&p, end, sizeof(fsid)+2*sizeof(u32), bad);
3741 ceph_decode_copy(&p, &fsid, sizeof(fsid));
3d14c5d2 3742 if (ceph_check_fsid(mdsc->fsc->client, &fsid) < 0)
0743304d 3743 return;
c89136ea
SW		 3744 epoch = ceph_decode_32(&p);
3745 maplen = ceph_decode_32(&p);
2f2dc053
SW		 3746 dout("handle_map epoch %u len %d\n", epoch, (int)maplen);
3747
3748 /* do we need it? */
2f2dc053
SW		 3749 mutex_lock(&mdsc->mutex);
3750 if (mdsc->mdsmap && epoch <= mdsc->mdsmap->m_epoch) {
3751 dout("handle_map epoch %u <= our %u\n",
3752 epoch, mdsc->mdsmap->m_epoch);
3753 mutex_unlock(&mdsc->mutex);
3754 return;
3755 }
3756
3757 newmap = ceph_mdsmap_decode(&p, end);
3758 if (IS_ERR(newmap)) {
3759 err = PTR_ERR(newmap);
3760 goto bad_unlock;
3761 }
3762
3763 /* swap into place */
3764 if (mdsc->mdsmap) {
3765 oldmap = mdsc->mdsmap;
3766 mdsc->mdsmap = newmap;
3767 check_new_map(mdsc, newmap, oldmap);
3768 ceph_mdsmap_destroy(oldmap);
3769 } else {
3770 mdsc->mdsmap = newmap; /* first mds map */
3771 }
3d14c5d2 3772 mdsc->fsc->sb->s_maxbytes = mdsc->mdsmap->m_max_file_size;
2f2dc053
SW		 3773
3774 __wake_requests(mdsc, &mdsc->waiting_for_map);
82dcabad
ID		 3775 ceph_monc_got_map(&mdsc->fsc->client->monc, CEPH_SUB_MDSMAP,
3776 mdsc->mdsmap->m_epoch);
2f2dc053
SW		 3777
3778 mutex_unlock(&mdsc->mutex);
3779 schedule_delayed(mdsc);
3780 return;
3781
3782bad_unlock:
3783 mutex_unlock(&mdsc->mutex);
3784bad:
3785 pr_err("error decoding mdsmap %d\n", err);
3786 return;
3787}
3788
3789static struct ceph_connection *con_get(struct ceph_connection *con)
3790{
3791 struct ceph_mds_session *s = con->private;
3792
3793 if (get_session(s)) {
2600d2dd 3794 dout("mdsc con_get %p ok (%d)\n", s, atomic_read(&s->s_ref));
2f2dc053
SW		 3795 return con;
3796 }
3797 dout("mdsc con_get %p FAIL\n", s);
3798 return NULL;
3799}
3800
3801static void con_put(struct ceph_connection *con)
3802{
3803 struct ceph_mds_session *s = con->private;
3804
7d8e18a6 3805 dout("mdsc con_put %p (%d)\n", s, atomic_read(&s->s_ref) - 1);
2f2dc053
SW		 3806 ceph_put_mds_session(s);
3807}
3808
3809/*
3810 * if the client is unresponsive for long enough, the mds will kill
3811 * the session entirely.
3812 */
3813static void peer_reset(struct ceph_connection *con)
3814{
3815 struct ceph_mds_session *s = con->private;
7e70f0ed 3816 struct ceph_mds_client *mdsc = s->s_mdsc;
2f2dc053 3817
f3ae1b97 3818 pr_warn("mds%d closed our session\n", s->s_mds);
7e70f0ed 3819 send_mds_reconnect(mdsc, s);
2f2dc053
SW		 3820}
3821
3822static void dispatch(struct ceph_connection *con, struct ceph_msg *msg)
3823{
3824 struct ceph_mds_session *s = con->private;
3825 struct ceph_mds_client *mdsc = s->s_mdsc;
3826 int type = le16_to_cpu(msg->hdr.type);
3827
2600d2dd
SW		 3828 mutex_lock(&mdsc->mutex);
3829 if (__verify_registered_session(mdsc, s) < 0) {
3830 mutex_unlock(&mdsc->mutex);
3831 goto out;
3832 }
3833 mutex_unlock(&mdsc->mutex);
3834
2f2dc053
SW		 3835 switch (type) {
3836 case CEPH_MSG_MDS_MAP:
3837 ceph_mdsc_handle_map(mdsc, msg);
3838 break;
3839 case CEPH_MSG_CLIENT_SESSION:
3840 handle_session(s, msg);
3841 break;
3842 case CEPH_MSG_CLIENT_REPLY:
3843 handle_reply(s, msg);
3844 break;
3845 case CEPH_MSG_CLIENT_REQUEST_FORWARD:
2600d2dd 3846 handle_forward(mdsc, s, msg);
2f2dc053
SW		 3847 break;
3848 case CEPH_MSG_CLIENT_CAPS:
3849 ceph_handle_caps(s, msg);
3850 break;
3851 case CEPH_MSG_CLIENT_SNAP:
2600d2dd 3852 ceph_handle_snap(mdsc, s, msg);
2f2dc053
SW		 3853 break;
3854 case CEPH_MSG_CLIENT_LEASE:
2600d2dd 3855 handle_lease(mdsc, s, msg);
2f2dc053
SW		 3856 break;
3857
3858 default:
3859 pr_err("received unknown message type %d %s\n", type,
3860 ceph_msg_type_name(type));
3861 }
2600d2dd 3862out:
2f2dc053
SW		 3863 ceph_msg_put(msg);
3864}
3865
4e7a5dcd
SW		 3866/*
3867 * authentication
3868 */
a3530df3
AE		 3869
3870/*
3871 * Note: returned pointer is the address of a structure that's
3872 * managed separately. Caller must *not* attempt to free it.
3873 */
3874static struct ceph_auth_handshake *get_authorizer(struct ceph_connection *con,
8f43fb53 3875 int *proto, int force_new)
4e7a5dcd
SW		 3876{
3877 struct ceph_mds_session *s = con->private;
3878 struct ceph_mds_client *mdsc = s->s_mdsc;
3d14c5d2 3879 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
74f1869f 3880 struct ceph_auth_handshake *auth = &s->s_auth;
4e7a5dcd 3881
74f1869f 3882 if (force_new && auth->authorizer) {
6c1ea260 3883 ceph_auth_destroy_authorizer(auth->authorizer);
74f1869f 3884 auth->authorizer = NULL;
4e7a5dcd 3885 }
27859f97
SW		 3886 if (!auth->authorizer) {
3887 int ret = ceph_auth_create_authorizer(ac, CEPH_ENTITY_TYPE_MDS,
3888 auth);
0bed9b5c
SW		 3889 if (ret)
3890 return ERR_PTR(ret);
27859f97
SW		 3891 } else {
3892 int ret = ceph_auth_update_authorizer(ac, CEPH_ENTITY_TYPE_MDS,
3893 auth);
a255651d 3894 if (ret)
a3530df3 3895 return ERR_PTR(ret);
4e7a5dcd 3896 }
4e7a5dcd 3897 *proto = ac->protocol;
74f1869f 3898
a3530df3 3899 return auth;
4e7a5dcd
SW		 3900}
3901
3902
3903static int verify_authorizer_reply(struct ceph_connection *con, int len)
3904{
3905 struct ceph_mds_session *s = con->private;
3906 struct ceph_mds_client *mdsc = s->s_mdsc;
3d14c5d2 3907 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
4e7a5dcd 3908
27859f97 3909 return ceph_auth_verify_authorizer_reply(ac, s->s_auth.authorizer, len);
4e7a5dcd
SW		 3910}
3911
9bd2e6f8
SW		 3912static int invalidate_authorizer(struct ceph_connection *con)
3913{
3914 struct ceph_mds_session *s = con->private;
3915 struct ceph_mds_client *mdsc = s->s_mdsc;
3d14c5d2 3916 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
9bd2e6f8 3917
27859f97 3918 ceph_auth_invalidate_authorizer(ac, CEPH_ENTITY_TYPE_MDS);
9bd2e6f8 3919
3d14c5d2 3920 return ceph_monc_validate_auth(&mdsc->fsc->client->monc);
9bd2e6f8
SW		 3921}
3922
53ded495
AE		 3923static struct ceph_msg *mds_alloc_msg(struct ceph_connection *con,
3924 struct ceph_msg_header *hdr, int *skip)
3925{
3926 struct ceph_msg *msg;
3927 int type = (int) le16_to_cpu(hdr->type);
3928 int front_len = (int) le32_to_cpu(hdr->front_len);
3929
3930 if (con->in_msg)
3931 return con->in_msg;
3932
3933 *skip = 0;
3934 msg = ceph_msg_new(type, front_len, GFP_NOFS, false);
3935 if (!msg) {
3936 pr_err("unable to allocate msg type %d len %d\n",
3937 type, front_len);
3938 return NULL;
3939 }
53ded495
AE		 3940
3941 return msg;
3942}
3943
79dbd1ba 3944static int mds_sign_message(struct ceph_msg *msg)
33d07337 3945{
79dbd1ba 3946 struct ceph_mds_session *s = msg->con->private;
33d07337 3947 struct ceph_auth_handshake *auth = &s->s_auth;
79dbd1ba 3948
33d07337
YZ		 3949 return ceph_auth_sign_message(auth, msg);
3950}
3951
79dbd1ba 3952static int mds_check_message_signature(struct ceph_msg *msg)
33d07337 3953{
79dbd1ba 3954 struct ceph_mds_session *s = msg->con->private;
33d07337 3955 struct ceph_auth_handshake *auth = &s->s_auth;
79dbd1ba 3956
33d07337
YZ		 3957 return ceph_auth_check_message_signature(auth, msg);
3958}
3959
9e32789f 3960static const struct ceph_connection_operations mds_con_ops = {
2f2dc053
SW		 3961 .get = con_get,
3962 .put = con_put,
3963 .dispatch = dispatch,
4e7a5dcd
SW		 3964 .get_authorizer = get_authorizer,
3965 .verify_authorizer_reply = verify_authorizer_reply,
9bd2e6f8 3966 .invalidate_authorizer = invalidate_authorizer,
2f2dc053 3967 .peer_reset = peer_reset,
53ded495 3968 .alloc_msg = mds_alloc_msg,
79dbd1ba
ID		 3969 .sign_message = mds_sign_message,
3970 .check_message_signature = mds_check_message_signature,
2f2dc053
SW		 3971};
3972
2f2dc053 3973/* eof */
Linux 6.x block layer and io_uring tree(s)