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libceph: add an epoch_barrier field to struct ceph_osd_client
[mirror_ubuntu-bionic-kernel.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45 * are no longer valid.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 50 struct ceph_pagelist *pagelist;
121f22a1 51 unsigned msg_version;
20cb34ae
SW		 52};
53
2f2dc053
SW		 54static void __wake_requests(struct ceph_mds_client *mdsc,
55 struct list_head *head);
56
9e32789f 57static const struct ceph_connection_operations mds_con_ops;
2f2dc053
SW		 58
59
60/*
61 * mds reply parsing
62 */
63
64/*
65 * parse individual inode info
66 */
67static int parse_reply_info_in(void **p, void *end,
14303d20 68 struct ceph_mds_reply_info_in *info,
12b4629a 69 u64 features)
2f2dc053
SW		 70{
71 int err = -EIO;
72
73 info->in = *p;
74 *p += sizeof(struct ceph_mds_reply_inode) +
75 sizeof(*info->in->fragtree.splits) *
76 le32_to_cpu(info->in->fragtree.nsplits);
77
78 ceph_decode_32_safe(p, end, info->symlink_len, bad);
79 ceph_decode_need(p, end, info->symlink_len, bad);
80 info->symlink = *p;
81 *p += info->symlink_len;
82
14303d20
SW		 83 if (features & CEPH_FEATURE_DIRLAYOUTHASH)
84 ceph_decode_copy_safe(p, end, &info->dir_layout,
85 sizeof(info->dir_layout), bad);
86 else
87 memset(&info->dir_layout, 0, sizeof(info->dir_layout));
88
2f2dc053
SW		 89 ceph_decode_32_safe(p, end, info->xattr_len, bad);
90 ceph_decode_need(p, end, info->xattr_len, bad);
91 info->xattr_data = *p;
92 *p += info->xattr_len;
fb01d1f8
YZ		 93
94 if (features & CEPH_FEATURE_MDS_INLINE_DATA) {
95 ceph_decode_64_safe(p, end, info->inline_version, bad);
96 ceph_decode_32_safe(p, end, info->inline_len, bad);
97 ceph_decode_need(p, end, info->inline_len, bad);
98 info->inline_data = *p;
99 *p += info->inline_len;
100 } else
101 info->inline_version = CEPH_INLINE_NONE;
102
779fe0fb
YZ		 103 info->pool_ns_len = 0;
104 info->pool_ns_data = NULL;
5ea5c5e0
YZ		 105 if (features & CEPH_FEATURE_FS_FILE_LAYOUT_V2) {
106 ceph_decode_32_safe(p, end, info->pool_ns_len, bad);
779fe0fb
YZ		 107 if (info->pool_ns_len > 0) {
108 ceph_decode_need(p, end, info->pool_ns_len, bad);
109 info->pool_ns_data = *p;
110 *p += info->pool_ns_len;
111 }
5ea5c5e0
YZ		 112 }
113
2f2dc053
SW		 114 return 0;
115bad:
116 return err;
117}
118
119/*
120 * parse a normal reply, which may contain a (dir+)dentry and/or a
121 * target inode.
122 */
123static int parse_reply_info_trace(void **p, void *end,
14303d20 124 struct ceph_mds_reply_info_parsed *info,
12b4629a 125 u64 features)
2f2dc053
SW		 126{
127 int err;
128
129 if (info->head->is_dentry) {
14303d20 130 err = parse_reply_info_in(p, end, &info->diri, features);
2f2dc053
SW		 131 if (err < 0)
132 goto out_bad;
133
134 if (unlikely(*p + sizeof(*info->dirfrag) > end))
135 goto bad;
136 info->dirfrag = *p;
137 *p += sizeof(*info->dirfrag) +
138 sizeof(u32)*le32_to_cpu(info->dirfrag->ndist);
139 if (unlikely(*p > end))
140 goto bad;
141
142 ceph_decode_32_safe(p, end, info->dname_len, bad);
143 ceph_decode_need(p, end, info->dname_len, bad);
144 info->dname = *p;
145 *p += info->dname_len;
146 info->dlease = *p;
147 *p += sizeof(*info->dlease);
148 }
149
150 if (info->head->is_target) {
14303d20 151 err = parse_reply_info_in(p, end, &info->targeti, features);
2f2dc053
SW		 152 if (err < 0)
153 goto out_bad;
154 }
155
156 if (unlikely(*p != end))
157 goto bad;
158 return 0;
159
160bad:
161 err = -EIO;
162out_bad:
163 pr_err("problem parsing mds trace %d\n", err);
164 return err;
165}
166
167/*
168 * parse readdir results
169 */
170static int parse_reply_info_dir(void **p, void *end,
14303d20 171 struct ceph_mds_reply_info_parsed *info,
12b4629a 172 u64 features)
2f2dc053
SW		 173{
174 u32 num, i = 0;
175 int err;
176
177 info->dir_dir = *p;
178 if (*p + sizeof(*info->dir_dir) > end)
179 goto bad;
180 *p += sizeof(*info->dir_dir) +
181 sizeof(u32)*le32_to_cpu(info->dir_dir->ndist);
182 if (*p > end)
183 goto bad;
184
185 ceph_decode_need(p, end, sizeof(num) + 2, bad);
c89136ea 186 num = ceph_decode_32(p);
956d39d6
YZ		 187 {
188 u16 flags = ceph_decode_16(p);
189 info->dir_end = !!(flags & CEPH_READDIR_FRAG_END);
190 info->dir_complete = !!(flags & CEPH_READDIR_FRAG_COMPLETE);
f3c4ebe6 191 info->hash_order = !!(flags & CEPH_READDIR_HASH_ORDER);
79162547 192 info->offset_hash = !!(flags & CEPH_READDIR_OFFSET_HASH);
956d39d6 193 }
2f2dc053
SW		 194 if (num == 0)
195 goto done;
196
2a5beea3
YZ		 197 BUG_ON(!info->dir_entries);
198 if ((unsigned long)(info->dir_entries + num) >
199 (unsigned long)info->dir_entries + info->dir_buf_size) {
54008399
YZ		 200 pr_err("dir contents are larger than expected\n");
201 WARN_ON(1);
202 goto bad;
203 }
2f2dc053 204
54008399 205 info->dir_nr = num;
2f2dc053 206 while (num) {
2a5beea3 207 struct ceph_mds_reply_dir_entry *rde = info->dir_entries + i;
2f2dc053
SW		 208 /* dentry */
209 ceph_decode_need(p, end, sizeof(u32)*2, bad);
2a5beea3
YZ		 210 rde->name_len = ceph_decode_32(p);
211 ceph_decode_need(p, end, rde->name_len, bad);
212 rde->name = *p;
213 *p += rde->name_len;
214 dout("parsed dir dname '%.*s'\n", rde->name_len, rde->name);
215 rde->lease = *p;
2f2dc053
SW		 216 *p += sizeof(struct ceph_mds_reply_lease);
217
218 /* inode */
2a5beea3 219 err = parse_reply_info_in(p, end, &rde->inode, features);
2f2dc053
SW		 220 if (err < 0)
221 goto out_bad;
8974eebd
YZ		 222 /* ceph_readdir_prepopulate() will update it */
223 rde->offset = 0;
2f2dc053
SW		 224 i++;
225 num--;
226 }
227
228done:
229 if (*p != end)
230 goto bad;
231 return 0;
232
233bad:
234 err = -EIO;
235out_bad:
236 pr_err("problem parsing dir contents %d\n", err);
237 return err;
238}
239
25933abd
HS		 240/*
241 * parse fcntl F_GETLK results
242 */
243static int parse_reply_info_filelock(void **p, void *end,
14303d20 244 struct ceph_mds_reply_info_parsed *info,
12b4629a 245 u64 features)
25933abd
HS		 246{
247 if (*p + sizeof(*info->filelock_reply) > end)
248 goto bad;
249
250 info->filelock_reply = *p;
251 *p += sizeof(*info->filelock_reply);
252
253 if (unlikely(*p != end))
254 goto bad;
255 return 0;
256
257bad:
258 return -EIO;
259}
260
6e8575fa
SL		 261/*
262 * parse create results
263 */
264static int parse_reply_info_create(void **p, void *end,
265 struct ceph_mds_reply_info_parsed *info,
12b4629a 266 u64 features)
6e8575fa
SL		 267{
268 if (features & CEPH_FEATURE_REPLY_CREATE_INODE) {
269 if (*p == end) {
270 info->has_create_ino = false;
271 } else {
272 info->has_create_ino = true;
273 info->ino = ceph_decode_64(p);
274 }
275 }
276
277 if (unlikely(*p != end))
278 goto bad;
279 return 0;
280
281bad:
282 return -EIO;
283}
284
25933abd
HS		 285/*
286 * parse extra results
287 */
288static int parse_reply_info_extra(void **p, void *end,
14303d20 289 struct ceph_mds_reply_info_parsed *info,
12b4629a 290 u64 features)
25933abd 291{
6df8c9d8
JL		 292 u32 op = le32_to_cpu(info->head->op);
293
294 if (op == CEPH_MDS_OP_GETFILELOCK)
14303d20 295 return parse_reply_info_filelock(p, end, info, features);
6df8c9d8 296 else if (op == CEPH_MDS_OP_READDIR || op == CEPH_MDS_OP_LSSNAP)
14303d20 297 return parse_reply_info_dir(p, end, info, features);
6df8c9d8 298 else if (op == CEPH_MDS_OP_CREATE)
6e8575fa
SL		 299 return parse_reply_info_create(p, end, info, features);
300 else
301 return -EIO;
25933abd
HS		 302}
303
2f2dc053
SW		 304/*
305 * parse entire mds reply
306 */
307static int parse_reply_info(struct ceph_msg *msg,
14303d20 308 struct ceph_mds_reply_info_parsed *info,
12b4629a 309 u64 features)
2f2dc053
SW		 310{
311 void *p, *end;
312 u32 len;
313 int err;
314
315 info->head = msg->front.iov_base;
316 p = msg->front.iov_base + sizeof(struct ceph_mds_reply_head);
317 end = p + msg->front.iov_len - sizeof(struct ceph_mds_reply_head);
318
319 /* trace */
320 ceph_decode_32_safe(&p, end, len, bad);
321 if (len > 0) {
32852a81 322 ceph_decode_need(&p, end, len, bad);
14303d20 323 err = parse_reply_info_trace(&p, p+len, info, features);
2f2dc053
SW		 324 if (err < 0)
325 goto out_bad;
326 }
327
25933abd 328 /* extra */
2f2dc053
SW		 329 ceph_decode_32_safe(&p, end, len, bad);
330 if (len > 0) {
32852a81 331 ceph_decode_need(&p, end, len, bad);
14303d20 332 err = parse_reply_info_extra(&p, p+len, info, features);
2f2dc053
SW		 333 if (err < 0)
334 goto out_bad;
335 }
336
337 /* snap blob */
338 ceph_decode_32_safe(&p, end, len, bad);
339 info->snapblob_len = len;
340 info->snapblob = p;
341 p += len;
342
343 if (p != end)
344 goto bad;
345 return 0;
346
347bad:
348 err = -EIO;
349out_bad:
350 pr_err("mds parse_reply err %d\n", err);
351 return err;
352}
353
354static void destroy_reply_info(struct ceph_mds_reply_info_parsed *info)
355{
2a5beea3 356 if (!info->dir_entries)
54008399 357 return;
2a5beea3 358 free_pages((unsigned long)info->dir_entries, get_order(info->dir_buf_size));
2f2dc053
SW		 359}
360
361
362/*
363 * sessions
364 */
a687ecaf 365const char *ceph_session_state_name(int s)
2f2dc053
SW		 366{
367 switch (s) {
368 case CEPH_MDS_SESSION_NEW: return "new";
369 case CEPH_MDS_SESSION_OPENING: return "opening";
370 case CEPH_MDS_SESSION_OPEN: return "open";
371 case CEPH_MDS_SESSION_HUNG: return "hung";
372 case CEPH_MDS_SESSION_CLOSING: return "closing";
44ca18f2 373 case CEPH_MDS_SESSION_RESTARTING: return "restarting";
2f2dc053 374 case CEPH_MDS_SESSION_RECONNECTING: return "reconnecting";
fcff415c 375 case CEPH_MDS_SESSION_REJECTED: return "rejected";
2f2dc053
SW		 376 default: return "???";
377 }
378}
379
380static struct ceph_mds_session *get_session(struct ceph_mds_session *s)
381{
3997c01d 382 if (refcount_inc_not_zero(&s->s_ref)) {
2f2dc053 383 dout("mdsc get_session %p %d -> %d\n", s,
3997c01d 384 refcount_read(&s->s_ref)-1, refcount_read(&s->s_ref));
2f2dc053
SW		 385 return s;
386 } else {
387 dout("mdsc get_session %p 0 -- FAIL", s);
388 return NULL;
389 }
390}
391
392void ceph_put_mds_session(struct ceph_mds_session *s)
393{
394 dout("mdsc put_session %p %d -> %d\n", s,
3997c01d
ER		 395 refcount_read(&s->s_ref), refcount_read(&s->s_ref)-1);
396 if (refcount_dec_and_test(&s->s_ref)) {
6c4a1915 397 if (s->s_auth.authorizer)
6c1ea260 398 ceph_auth_destroy_authorizer(s->s_auth.authorizer);
2f2dc053 399 kfree(s);
4e7a5dcd 400 }
2f2dc053
SW		 401}
402
403/*
404 * called under mdsc->mutex
405 */
406struct ceph_mds_session *__ceph_lookup_mds_session(struct ceph_mds_client *mdsc,
407 int mds)
408{
409 struct ceph_mds_session *session;
410
411 if (mds >= mdsc->max_sessions || mdsc->sessions[mds] == NULL)
412 return NULL;
413 session = mdsc->sessions[mds];
414 dout("lookup_mds_session %p %d\n", session,
3997c01d 415 refcount_read(&session->s_ref));
2f2dc053
SW		 416 get_session(session);
417 return session;
418}
419
420static bool __have_session(struct ceph_mds_client *mdsc, int mds)
421{
422 if (mds >= mdsc->max_sessions)
423 return false;
424 return mdsc->sessions[mds];
425}
426
2600d2dd
SW		 427static int __verify_registered_session(struct ceph_mds_client *mdsc,
428 struct ceph_mds_session *s)
429{
430 if (s->s_mds >= mdsc->max_sessions ||
431 mdsc->sessions[s->s_mds] != s)
432 return -ENOENT;
433 return 0;
434}
435
2f2dc053
SW		 436/*
437 * create+register a new session for given mds.
438 * called under mdsc->mutex.
439 */
440static struct ceph_mds_session *register_session(struct ceph_mds_client *mdsc,
441 int mds)
442{
443 struct ceph_mds_session *s;
444
76201b63 445 if (mds >= mdsc->mdsmap->m_num_mds)
c338c07c
NY		 446 return ERR_PTR(-EINVAL);
447
2f2dc053 448 s = kzalloc(sizeof(*s), GFP_NOFS);
4736b009
DC		 449 if (!s)
450 return ERR_PTR(-ENOMEM);
2f2dc053
SW		 451 s->s_mdsc = mdsc;
452 s->s_mds = mds;
453 s->s_state = CEPH_MDS_SESSION_NEW;
454 s->s_ttl = 0;
455 s->s_seq = 0;
456 mutex_init(&s->s_mutex);
457
b7a9e5dd 458 ceph_con_init(&s->s_con, s, &mds_con_ops, &mdsc->fsc->client->msgr);
2f2dc053 459
d8fb02ab 460 spin_lock_init(&s->s_gen_ttl_lock);
2f2dc053 461 s->s_cap_gen = 0;
1ce208a6 462 s->s_cap_ttl = jiffies - 1;
d8fb02ab
AE		 463
464 spin_lock_init(&s->s_cap_lock);
2f2dc053
SW		 465 s->s_renew_requested = 0;
466 s->s_renew_seq = 0;
467 INIT_LIST_HEAD(&s->s_caps);
468 s->s_nr_caps = 0;
5dacf091 469 s->s_trim_caps = 0;
3997c01d 470 refcount_set(&s->s_ref, 1);
2f2dc053
SW		 471 INIT_LIST_HEAD(&s->s_waiting);
472 INIT_LIST_HEAD(&s->s_unsafe);
473 s->s_num_cap_releases = 0;
99a9c273 474 s->s_cap_reconnect = 0;
7c1332b8 475 s->s_cap_iterator = NULL;
2f2dc053 476 INIT_LIST_HEAD(&s->s_cap_releases);
2f2dc053 477 INIT_LIST_HEAD(&s->s_cap_flushing);
2f2dc053
SW		 478
479 dout("register_session mds%d\n", mds);
480 if (mds >= mdsc->max_sessions) {
481 int newmax = 1 << get_count_order(mds+1);
482 struct ceph_mds_session **sa;
483
484 dout("register_session realloc to %d\n", newmax);
485 sa = kcalloc(newmax, sizeof(void *), GFP_NOFS);
486 if (sa == NULL)
42ce56e5 487 goto fail_realloc;
2f2dc053
SW		 488 if (mdsc->sessions) {
489 memcpy(sa, mdsc->sessions,
490 mdsc->max_sessions * sizeof(void *));
491 kfree(mdsc->sessions);
492 }
493 mdsc->sessions = sa;
494 mdsc->max_sessions = newmax;
495 }
496 mdsc->sessions[mds] = s;
86d8f67b 497 atomic_inc(&mdsc->num_sessions);
3997c01d 498 refcount_inc(&s->s_ref); /* one ref to sessions[], one to caller */
42ce56e5 499
b7a9e5dd
SW		 500 ceph_con_open(&s->s_con, CEPH_ENTITY_TYPE_MDS, mds,
501 ceph_mdsmap_get_addr(mdsc->mdsmap, mds));
42ce56e5 502
2f2dc053 503 return s;
42ce56e5
SW		 504
505fail_realloc:
506 kfree(s);
507 return ERR_PTR(-ENOMEM);
2f2dc053
SW		 508}
509
510/*
511 * called under mdsc->mutex
512 */
2600d2dd 513static void __unregister_session(struct ceph_mds_client *mdsc,
42ce56e5 514 struct ceph_mds_session *s)
2f2dc053 515{
2600d2dd
SW		 516 dout("__unregister_session mds%d %p\n", s->s_mds, s);
517 BUG_ON(mdsc->sessions[s->s_mds] != s);
42ce56e5
SW		 518 mdsc->sessions[s->s_mds] = NULL;
519 ceph_con_close(&s->s_con);
520 ceph_put_mds_session(s);
86d8f67b 521 atomic_dec(&mdsc->num_sessions);
2f2dc053
SW		 522}
523
524/*
525 * drop session refs in request.
526 *
527 * should be last request ref, or hold mdsc->mutex
528 */
529static void put_request_session(struct ceph_mds_request *req)
530{
531 if (req->r_session) {
532 ceph_put_mds_session(req->r_session);
533 req->r_session = NULL;
534 }
535}
536
153c8e6b 537void ceph_mdsc_release_request(struct kref *kref)
2f2dc053 538{
153c8e6b
SW		 539 struct ceph_mds_request *req = container_of(kref,
540 struct ceph_mds_request,
541 r_kref);
54008399 542 destroy_reply_info(&req->r_reply_info);
153c8e6b
SW		 543 if (req->r_request)
544 ceph_msg_put(req->r_request);
54008399 545 if (req->r_reply)
153c8e6b 546 ceph_msg_put(req->r_reply);
153c8e6b 547 if (req->r_inode) {
41b02e1f 548 ceph_put_cap_refs(ceph_inode(req->r_inode), CEPH_CAP_PIN);
153c8e6b
SW		 549 iput(req->r_inode);
550 }
3dd69aab
JL		 551 if (req->r_parent)
552 ceph_put_cap_refs(ceph_inode(req->r_parent), CEPH_CAP_PIN);
e96a650a 553 iput(req->r_target_inode);
153c8e6b
SW		 554 if (req->r_dentry)
555 dput(req->r_dentry);
844d87c3
SW		 556 if (req->r_old_dentry)
557 dput(req->r_old_dentry);
558 if (req->r_old_dentry_dir) {
41b02e1f
SW		 559 /*
560 * track (and drop pins for) r_old_dentry_dir
561 * separately, since r_old_dentry's d_parent may have
562 * changed between the dir mutex being dropped and
563 * this request being freed.
564 */
565 ceph_put_cap_refs(ceph_inode(req->r_old_dentry_dir),
566 CEPH_CAP_PIN);
41b02e1f 567 iput(req->r_old_dentry_dir);
2f2dc053 568 }
153c8e6b
SW		 569 kfree(req->r_path1);
570 kfree(req->r_path2);
25e6bae3
YZ		 571 if (req->r_pagelist)
572 ceph_pagelist_release(req->r_pagelist);
153c8e6b 573 put_request_session(req);
37151668 574 ceph_unreserve_caps(req->r_mdsc, &req->r_caps_reservation);
153c8e6b 575 kfree(req);
2f2dc053
SW		 576}
577
fcd00b68
ID		 578DEFINE_RB_FUNCS(request, struct ceph_mds_request, r_tid, r_node)
579
2f2dc053
SW		 580/*
581 * lookup session, bump ref if found.
582 *
583 * called under mdsc->mutex.
584 */
fcd00b68
ID		 585static struct ceph_mds_request *
586lookup_get_request(struct ceph_mds_client *mdsc, u64 tid)
2f2dc053
SW		 587{
588 struct ceph_mds_request *req;
44ca18f2 589
fcd00b68
ID		 590 req = lookup_request(&mdsc->request_tree, tid);
591 if (req)
592 ceph_mdsc_get_request(req);
44ca18f2 593
fcd00b68 594 return req;
2f2dc053
SW		 595}
596
597/*
598 * Register an in-flight request, and assign a tid. Link to directory
599 * are modifying (if any).
600 *
601 * Called under mdsc->mutex.
602 */
603static void __register_request(struct ceph_mds_client *mdsc,
604 struct ceph_mds_request *req,
605 struct inode *dir)
606{
607 req->r_tid = ++mdsc->last_tid;
608 if (req->r_num_caps)
37151668
YS		 609 ceph_reserve_caps(mdsc, &req->r_caps_reservation,
610 req->r_num_caps);
2f2dc053
SW		 611 dout("__register_request %p tid %lld\n", req, req->r_tid);
612 ceph_mdsc_get_request(req);
fcd00b68 613 insert_request(&mdsc->request_tree, req);
2f2dc053 614
cb4276cc
SW		 615 req->r_uid = current_fsuid();
616 req->r_gid = current_fsgid();
617
e8a7b8b1
YZ		 618 if (mdsc->oldest_tid == 0 && req->r_op != CEPH_MDS_OP_SETFILELOCK)
619 mdsc->oldest_tid = req->r_tid;
620
2f2dc053 621 if (dir) {
3b663780 622 ihold(dir);
2f2dc053 623 req->r_unsafe_dir = dir;
2f2dc053
SW		 624 }
625}
626
627static void __unregister_request(struct ceph_mds_client *mdsc,
628 struct ceph_mds_request *req)
629{
630 dout("__unregister_request %p tid %lld\n", req, req->r_tid);
e8a7b8b1 631
df963ea8
JL		 632 /* Never leave an unregistered request on an unsafe list! */
633 list_del_init(&req->r_unsafe_item);
634
e8a7b8b1
YZ		 635 if (req->r_tid == mdsc->oldest_tid) {
636 struct rb_node *p = rb_next(&req->r_node);
637 mdsc->oldest_tid = 0;
638 while (p) {
639 struct ceph_mds_request *next_req =
640 rb_entry(p, struct ceph_mds_request, r_node);
641 if (next_req->r_op != CEPH_MDS_OP_SETFILELOCK) {
642 mdsc->oldest_tid = next_req->r_tid;
643 break;
644 }
645 p = rb_next(p);
646 }
647 }
648
fcd00b68 649 erase_request(&mdsc->request_tree, req);
2f2dc053 650
bc2de10d
JL		 651 if (req->r_unsafe_dir &&
652 test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) {
2f2dc053 653 struct ceph_inode_info *ci = ceph_inode(req->r_unsafe_dir);
2f2dc053
SW		 654 spin_lock(&ci->i_unsafe_lock);
655 list_del_init(&req->r_unsafe_dir_item);
656 spin_unlock(&ci->i_unsafe_lock);
4c06ace8 657 }
bc2de10d
JL		 658 if (req->r_target_inode &&
659 test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) {
68cd5b4b
YZ		 660 struct ceph_inode_info *ci = ceph_inode(req->r_target_inode);
661 spin_lock(&ci->i_unsafe_lock);
662 list_del_init(&req->r_unsafe_target_item);
663 spin_unlock(&ci->i_unsafe_lock);
664 }
3b663780 665
4c06ace8 666 if (req->r_unsafe_dir) {
3b663780
SW		 667 iput(req->r_unsafe_dir);
668 req->r_unsafe_dir = NULL;
2f2dc053 669 }
94aa8ae1 670
fc55d2c9
YZ		 671 complete_all(&req->r_safe_completion);
672
94aa8ae1 673 ceph_mdsc_put_request(req);
2f2dc053
SW		 674}
675
30c71233
JL		 676/*
677 * Walk back up the dentry tree until we hit a dentry representing a
678 * non-snapshot inode. We do this using the rcu_read_lock (which must be held
679 * when calling this) to ensure that the objects won't disappear while we're
680 * working with them. Once we hit a candidate dentry, we attempt to take a
681 * reference to it, and return that as the result.
682 */
f1075480
DC		 683static struct inode *get_nonsnap_parent(struct dentry *dentry)
684{
685 struct inode *inode = NULL;
30c71233
JL		 686
687 while (dentry && !IS_ROOT(dentry)) {
688 inode = d_inode_rcu(dentry);
689 if (!inode || ceph_snap(inode) == CEPH_NOSNAP)
690 break;
691 dentry = dentry->d_parent;
692 }
693 if (inode)
694 inode = igrab(inode);
695 return inode;
696}
697
2f2dc053
SW		 698/*
699 * Choose mds to send request to next. If there is a hint set in the
700 * request (e.g., due to a prior forward hint from the mds), use that.
701 * Otherwise, consult frag tree and/or caps to identify the
702 * appropriate mds. If all else fails, choose randomly.
703 *
704 * Called under mdsc->mutex.
705 */
706static int __choose_mds(struct ceph_mds_client *mdsc,
707 struct ceph_mds_request *req)
708{
709 struct inode *inode;
710 struct ceph_inode_info *ci;
711 struct ceph_cap *cap;
712 int mode = req->r_direct_mode;
713 int mds = -1;
714 u32 hash = req->r_direct_hash;
bc2de10d 715 bool is_hash = test_bit(CEPH_MDS_R_DIRECT_IS_HASH, &req->r_req_flags);
2f2dc053
SW		 716
717 /*
718 * is there a specific mds we should try? ignore hint if we have
719 * no session and the mds is not up (active or recovering).
720 */
721 if (req->r_resend_mds >= 0 &&
722 (__have_session(mdsc, req->r_resend_mds) ||
723 ceph_mdsmap_get_state(mdsc->mdsmap, req->r_resend_mds) > 0)) {
724 dout("choose_mds using resend_mds mds%d\n",
725 req->r_resend_mds);
726 return req->r_resend_mds;
727 }
728
729 if (mode == USE_RANDOM_MDS)
730 goto random;
731
732 inode = NULL;
733 if (req->r_inode) {
734 inode = req->r_inode;
30c71233 735 ihold(inode);
2f2dc053 736 } else if (req->r_dentry) {
d79698da 737 /* ignore race with rename; old or new d_parent is okay */
30c71233
JL		 738 struct dentry *parent;
739 struct inode *dir;
740
741 rcu_read_lock();
742 parent = req->r_dentry->d_parent;
3dd69aab 743 dir = req->r_parent ? : d_inode_rcu(parent);
eb6bb1c5 744
30c71233
JL		 745 if (!dir || dir->i_sb != mdsc->fsc->sb) {
746 /* not this fs or parent went negative */
2b0143b5 747 inode = d_inode(req->r_dentry);
30c71233
JL		 748 if (inode)
749 ihold(inode);
eb6bb1c5
SW		 750 } else if (ceph_snap(dir) != CEPH_NOSNAP) {
751 /* direct snapped/virtual snapdir requests
752 * based on parent dir inode */
30c71233 753 inode = get_nonsnap_parent(parent);
eb6bb1c5 754 dout("__choose_mds using nonsnap parent %p\n", inode);
ca18bede 755 } else {
eb6bb1c5 756 /* dentry target */
2b0143b5 757 inode = d_inode(req->r_dentry);
ca18bede
YZ		 758 if (!inode || mode == USE_AUTH_MDS) {
759 /* dir + name */
30c71233 760 inode = igrab(dir);
ca18bede
YZ		 761 hash = ceph_dentry_hash(dir, req->r_dentry);
762 is_hash = true;
30c71233
JL		 763 } else {
764 ihold(inode);
ca18bede 765 }
2f2dc053 766 }
30c71233 767 rcu_read_unlock();
2f2dc053 768 }
eb6bb1c5 769
2f2dc053
SW		 770 dout("__choose_mds %p is_hash=%d (%d) mode %d\n", inode, (int)is_hash,
771 (int)hash, mode);
772 if (!inode)
773 goto random;
774 ci = ceph_inode(inode);
775
776 if (is_hash && S_ISDIR(inode->i_mode)) {
777 struct ceph_inode_frag frag;
778 int found;
779
780 ceph_choose_frag(ci, hash, &frag, &found);
781 if (found) {
782 if (mode == USE_ANY_MDS && frag.ndist > 0) {
783 u8 r;
784
785 /* choose a random replica */
786 get_random_bytes(&r, 1);
787 r %= frag.ndist;
788 mds = frag.dist[r];
789 dout("choose_mds %p %llx.%llx "
790 "frag %u mds%d (%d/%d)\n",
791 inode, ceph_vinop(inode),
d66bbd44 792 frag.frag, mds,
2f2dc053 793 (int)r, frag.ndist);
d66bbd44
SW		 794 if (ceph_mdsmap_get_state(mdsc->mdsmap, mds) >=
795 CEPH_MDS_STATE_ACTIVE)
30c71233 796 goto out;
2f2dc053
SW		 797 }
798
799 /* since this file/dir wasn't known to be
800 * replicated, then we want to look for the
801 * authoritative mds. */
802 mode = USE_AUTH_MDS;
803 if (frag.mds >= 0) {
804 /* choose auth mds */
805 mds = frag.mds;
806 dout("choose_mds %p %llx.%llx "
807 "frag %u mds%d (auth)\n",
808 inode, ceph_vinop(inode), frag.frag, mds);
d66bbd44
SW		 809 if (ceph_mdsmap_get_state(mdsc->mdsmap, mds) >=
810 CEPH_MDS_STATE_ACTIVE)
30c71233 811 goto out;
2f2dc053
SW		 812 }
813 }
814 }
815
be655596 816 spin_lock(&ci->i_ceph_lock);
2f2dc053
SW		 817 cap = NULL;
818 if (mode == USE_AUTH_MDS)
819 cap = ci->i_auth_cap;
820 if (!cap && !RB_EMPTY_ROOT(&ci->i_caps))
821 cap = rb_entry(rb_first(&ci->i_caps), struct ceph_cap, ci_node);
822 if (!cap) {
be655596 823 spin_unlock(&ci->i_ceph_lock);
30c71233 824 iput(inode);
2f2dc053
SW		 825 goto random;
826 }
827 mds = cap->session->s_mds;
828 dout("choose_mds %p %llx.%llx mds%d (%scap %p)\n",
829 inode, ceph_vinop(inode), mds,
830 cap == ci->i_auth_cap ? "auth " : "", cap);
be655596 831 spin_unlock(&ci->i_ceph_lock);
30c71233
JL		 832out:
833 iput(inode);
2f2dc053
SW		 834 return mds;
835
836random:
837 mds = ceph_mdsmap_get_random_mds(mdsc->mdsmap);
838 dout("choose_mds chose random mds%d\n", mds);
839 return mds;
840}
841
842
843/*
844 * session messages
845 */
846static struct ceph_msg *create_session_msg(u32 op, u64 seq)
847{
848 struct ceph_msg *msg;
849 struct ceph_mds_session_head *h;
850
b61c2763
SW		 851 msg = ceph_msg_new(CEPH_MSG_CLIENT_SESSION, sizeof(*h), GFP_NOFS,
852 false);
a79832f2 853 if (!msg) {
2f2dc053 854 pr_err("create_session_msg ENOMEM creating msg\n");
a79832f2 855 return NULL;
2f2dc053
SW		 856 }
857 h = msg->front.iov_base;
858 h->op = cpu_to_le32(op);
859 h->seq = cpu_to_le64(seq);
dbd0c8bf
JS		 860
861 return msg;
862}
863
864/*
865 * session message, specialization for CEPH_SESSION_REQUEST_OPEN
866 * to include additional client metadata fields.
867 */
868static struct ceph_msg *create_session_open_msg(struct ceph_mds_client *mdsc, u64 seq)
869{
870 struct ceph_msg *msg;
871 struct ceph_mds_session_head *h;
872 int i = -1;
873 int metadata_bytes = 0;
874 int metadata_key_count = 0;
875 struct ceph_options *opt = mdsc->fsc->client->options;
3f384954 876 struct ceph_mount_options *fsopt = mdsc->fsc->mount_options;
dbd0c8bf
JS		 877 void *p;
878
a6a5ce4f 879 const char* metadata[][2] = {
dbd0c8bf 880 {"hostname", utsname()->nodename},
a6a5ce4f 881 {"kernel_version", utsname()->release},
3f384954
YZ		 882 {"entity_id", opt->name ? : ""},
883 {"root", fsopt->server_path ? : "/"},
dbd0c8bf
JS		 884 {NULL, NULL}
885 };
886
887 /* Calculate serialized length of metadata */
888 metadata_bytes = 4; /* map length */
889 for (i = 0; metadata[i][0] != NULL; ++i) {
890 metadata_bytes += 8 + strlen(metadata[i][0]) +
891 strlen(metadata[i][1]);
892 metadata_key_count++;
893 }
894
895 /* Allocate the message */
896 msg = ceph_msg_new(CEPH_MSG_CLIENT_SESSION, sizeof(*h) + metadata_bytes,
897 GFP_NOFS, false);
898 if (!msg) {
899 pr_err("create_session_msg ENOMEM creating msg\n");
900 return NULL;
901 }
902 h = msg->front.iov_base;
903 h->op = cpu_to_le32(CEPH_SESSION_REQUEST_OPEN);
904 h->seq = cpu_to_le64(seq);
905
906 /*
907 * Serialize client metadata into waiting buffer space, using
908 * the format that userspace expects for map<string, string>
7cfa0313
JS		 909 *
910 * ClientSession messages with metadata are v2
dbd0c8bf 911 */
7cfa0313
JS		 912 msg->hdr.version = cpu_to_le16(2);
913 msg->hdr.compat_version = cpu_to_le16(1);
dbd0c8bf
JS		 914
915 /* The write pointer, following the session_head structure */
916 p = msg->front.iov_base + sizeof(*h);
917
918 /* Number of entries in the map */
919 ceph_encode_32(&p, metadata_key_count);
920
921 /* Two length-prefixed strings for each entry in the map */
922 for (i = 0; metadata[i][0] != NULL; ++i) {
923 size_t const key_len = strlen(metadata[i][0]);
924 size_t const val_len = strlen(metadata[i][1]);
925
926 ceph_encode_32(&p, key_len);
927 memcpy(p, metadata[i][0], key_len);
928 p += key_len;
929 ceph_encode_32(&p, val_len);
930 memcpy(p, metadata[i][1], val_len);
931 p += val_len;
932 }
933
2f2dc053
SW		 934 return msg;
935}
936
937/*
938 * send session open request.
939 *
940 * called under mdsc->mutex
941 */
942static int __open_session(struct ceph_mds_client *mdsc,
943 struct ceph_mds_session *session)
944{
945 struct ceph_msg *msg;
946 int mstate;
947 int mds = session->s_mds;
2f2dc053
SW		 948
949 /* wait for mds to go active? */
950 mstate = ceph_mdsmap_get_state(mdsc->mdsmap, mds);
951 dout("open_session to mds%d (%s)\n", mds,
952 ceph_mds_state_name(mstate));
953 session->s_state = CEPH_MDS_SESSION_OPENING;
954 session->s_renew_requested = jiffies;
955
956 /* send connect message */
dbd0c8bf 957 msg = create_session_open_msg(mdsc, session->s_seq);
a79832f2
SW		 958 if (!msg)
959 return -ENOMEM;
2f2dc053 960 ceph_con_send(&session->s_con, msg);
2f2dc053
SW		 961 return 0;
962}
963
ed0552a1
SW		 964/*
965 * open sessions for any export targets for the given mds
966 *
967 * called under mdsc->mutex
968 */
5d72d13c
YZ		 969static struct ceph_mds_session *
970__open_export_target_session(struct ceph_mds_client *mdsc, int target)
971{
972 struct ceph_mds_session *session;
973
974 session = __ceph_lookup_mds_session(mdsc, target);
975 if (!session) {
976 session = register_session(mdsc, target);
977 if (IS_ERR(session))
978 return session;
979 }
980 if (session->s_state == CEPH_MDS_SESSION_NEW ||
981 session->s_state == CEPH_MDS_SESSION_CLOSING)
982 __open_session(mdsc, session);
983
984 return session;
985}
986
987struct ceph_mds_session *
988ceph_mdsc_open_export_target_session(struct ceph_mds_client *mdsc, int target)
989{
990 struct ceph_mds_session *session;
991
992 dout("open_export_target_session to mds%d\n", target);
993
994 mutex_lock(&mdsc->mutex);
995 session = __open_export_target_session(mdsc, target);
996 mutex_unlock(&mdsc->mutex);
997
998 return session;
999}
1000
ed0552a1
SW		 1001static void __open_export_target_sessions(struct ceph_mds_client *mdsc,
1002 struct ceph_mds_session *session)
1003{
1004 struct ceph_mds_info *mi;
1005 struct ceph_mds_session *ts;
1006 int i, mds = session->s_mds;
ed0552a1 1007
76201b63 1008 if (mds >= mdsc->mdsmap->m_num_mds)
ed0552a1 1009 return;
5d72d13c 1010
ed0552a1
SW		 1011 mi = &mdsc->mdsmap->m_info[mds];
1012 dout("open_export_target_sessions for mds%d (%d targets)\n",
1013 session->s_mds, mi->num_export_targets);
1014
1015 for (i = 0; i < mi->num_export_targets; i++) {
5d72d13c
YZ		 1016 ts = __open_export_target_session(mdsc, mi->export_targets[i]);
1017 if (!IS_ERR(ts))
1018 ceph_put_mds_session(ts);
ed0552a1
SW		 1019 }
1020}
1021
154f42c2
SW		 1022void ceph_mdsc_open_export_target_sessions(struct ceph_mds_client *mdsc,
1023 struct ceph_mds_session *session)
1024{
1025 mutex_lock(&mdsc->mutex);
1026 __open_export_target_sessions(mdsc, session);
1027 mutex_unlock(&mdsc->mutex);
1028}
1029
2f2dc053
SW		 1030/*
1031 * session caps
1032 */
1033
745a8e3b
YZ		 1034/* caller holds s_cap_lock, we drop it */
1035static void cleanup_cap_releases(struct ceph_mds_client *mdsc,
1036 struct ceph_mds_session *session)
1037 __releases(session->s_cap_lock)
2f2dc053 1038{
745a8e3b
YZ		 1039 LIST_HEAD(tmp_list);
1040 list_splice_init(&session->s_cap_releases, &tmp_list);
1041 session->s_num_cap_releases = 0;
1042 spin_unlock(&session->s_cap_lock);
2f2dc053 1043
745a8e3b
YZ		 1044 dout("cleanup_cap_releases mds%d\n", session->s_mds);
1045 while (!list_empty(&tmp_list)) {
1046 struct ceph_cap *cap;
1047 /* zero out the in-progress message */
1048 cap = list_first_entry(&tmp_list,
1049 struct ceph_cap, session_caps);
1050 list_del(&cap->session_caps);
1051 ceph_put_cap(mdsc, cap);
2f2dc053 1052 }
2f2dc053
SW		 1053}
1054
1c841a96
YZ		 1055static void cleanup_session_requests(struct ceph_mds_client *mdsc,
1056 struct ceph_mds_session *session)
1057{
1058 struct ceph_mds_request *req;
1059 struct rb_node *p;
1060
1061 dout("cleanup_session_requests mds%d\n", session->s_mds);
1062 mutex_lock(&mdsc->mutex);
1063 while (!list_empty(&session->s_unsafe)) {
1064 req = list_first_entry(&session->s_unsafe,
1065 struct ceph_mds_request, r_unsafe_item);
3e0708b9
YZ		 1066 pr_warn_ratelimited(" dropping unsafe request %llu\n",
1067 req->r_tid);
1c841a96
YZ		 1068 __unregister_request(mdsc, req);
1069 }
1070 /* zero r_attempts, so kick_requests() will re-send requests */
1071 p = rb_first(&mdsc->request_tree);
1072 while (p) {
1073 req = rb_entry(p, struct ceph_mds_request, r_node);
1074 p = rb_next(p);
1075 if (req->r_session &&
1076 req->r_session->s_mds == session->s_mds)
1077 req->r_attempts = 0;
1078 }
1079 mutex_unlock(&mdsc->mutex);
1080}
1081
2f2dc053 1082/*
f818a736
SW		 1083 * Helper to safely iterate over all caps associated with a session, with
1084 * special care taken to handle a racing __ceph_remove_cap().
2f2dc053 1085 *
f818a736 1086 * Caller must hold session s_mutex.
2f2dc053
SW		 1087 */
1088static int iterate_session_caps(struct ceph_mds_session *session,
1089 int (*cb)(struct inode *, struct ceph_cap *,
1090 void *), void *arg)
1091{
7c1332b8
SW		 1092 struct list_head *p;
1093 struct ceph_cap *cap;
1094 struct inode *inode, *last_inode = NULL;
1095 struct ceph_cap *old_cap = NULL;
2f2dc053
SW		 1096 int ret;
1097
1098 dout("iterate_session_caps %p mds%d\n", session, session->s_mds);
1099 spin_lock(&session->s_cap_lock);
7c1332b8
SW		 1100 p = session->s_caps.next;
1101 while (p != &session->s_caps) {
1102 cap = list_entry(p, struct ceph_cap, session_caps);
2f2dc053 1103 inode = igrab(&cap->ci->vfs_inode);
7c1332b8
SW		 1104 if (!inode) {
1105 p = p->next;
2f2dc053 1106 continue;
7c1332b8
SW		 1107 }
1108 session->s_cap_iterator = cap;
2f2dc053 1109 spin_unlock(&session->s_cap_lock);
7c1332b8
SW		 1110
1111 if (last_inode) {
1112 iput(last_inode);
1113 last_inode = NULL;
1114 }
1115 if (old_cap) {
37151668 1116 ceph_put_cap(session->s_mdsc, old_cap);
7c1332b8
SW		 1117 old_cap = NULL;
1118 }
1119
2f2dc053 1120 ret = cb(inode, cap, arg);
7c1332b8
SW		 1121 last_inode = inode;
1122
2f2dc053 1123 spin_lock(&session->s_cap_lock);
7c1332b8
SW		 1124 p = p->next;
1125 if (cap->ci == NULL) {
1126 dout("iterate_session_caps finishing cap %p removal\n",
1127 cap);
1128 BUG_ON(cap->session != session);
745a8e3b 1129 cap->session = NULL;
7c1332b8
SW		 1130 list_del_init(&cap->session_caps);
1131 session->s_nr_caps--;
745a8e3b
YZ		 1132 if (cap->queue_release) {
1133 list_add_tail(&cap->session_caps,
1134 &session->s_cap_releases);
1135 session->s_num_cap_releases++;
1136 } else {
1137 old_cap = cap; /* put_cap it w/o locks held */
1138 }
7c1332b8 1139 }
5dacf091
SW		 1140 if (ret < 0)
1141 goto out;
2f2dc053 1142 }
5dacf091
SW		 1143 ret = 0;
1144out:
7c1332b8 1145 session->s_cap_iterator = NULL;
2f2dc053 1146 spin_unlock(&session->s_cap_lock);
7c1332b8 1147
e96a650a 1148 iput(last_inode);
7c1332b8 1149 if (old_cap)
37151668 1150 ceph_put_cap(session->s_mdsc, old_cap);
7c1332b8 1151
5dacf091 1152 return ret;
2f2dc053
SW		 1153}
1154
1155static int remove_session_caps_cb(struct inode *inode, struct ceph_cap *cap,
6c99f254 1156 void *arg)
2f2dc053 1157{
6c93df5d 1158 struct ceph_fs_client *fsc = (struct ceph_fs_client *)arg;
2f2dc053 1159 struct ceph_inode_info *ci = ceph_inode(inode);
553adfd9 1160 LIST_HEAD(to_remove);
6c93df5d
YZ		 1161 bool drop = false;
1162 bool invalidate = false;
6c99f254 1163
2f2dc053
SW		 1164 dout("removing cap %p, ci is %p, inode is %p\n",
1165 cap, ci, &ci->vfs_inode);
be655596 1166 spin_lock(&ci->i_ceph_lock);
a096b09a 1167 __ceph_remove_cap(cap, false);
571ade33 1168 if (!ci->i_auth_cap) {
553adfd9 1169 struct ceph_cap_flush *cf;
6c93df5d 1170 struct ceph_mds_client *mdsc = fsc->mdsc;
6c99f254 1171
77310320
YZ		 1172 ci->i_ceph_flags |= CEPH_I_CAP_DROPPED;
1173
6c93df5d 1174 if (ci->i_wrbuffer_ref > 0 &&
52953d55 1175 READ_ONCE(fsc->mount_state) == CEPH_MOUNT_SHUTDOWN)
6c93df5d
YZ		 1176 invalidate = true;
1177
e4500b5e
YZ		 1178 while (!list_empty(&ci->i_cap_flush_list)) {
1179 cf = list_first_entry(&ci->i_cap_flush_list,
1180 struct ceph_cap_flush, i_list);
8cdcc07d 1181 list_move(&cf->i_list, &to_remove);
553adfd9
YZ		 1182 }
1183
6c99f254 1184 spin_lock(&mdsc->cap_dirty_lock);
8310b089 1185
e4500b5e
YZ		 1186 list_for_each_entry(cf, &to_remove, i_list)
1187 list_del(&cf->g_list);
8310b089 1188
6c99f254 1189 if (!list_empty(&ci->i_dirty_item)) {
3e0708b9
YZ		 1190 pr_warn_ratelimited(
1191 " dropping dirty %s state for %p %lld\n",
6c99f254
SW		 1192 ceph_cap_string(ci->i_dirty_caps),
1193 inode, ceph_ino(inode));
1194 ci->i_dirty_caps = 0;
1195 list_del_init(&ci->i_dirty_item);
6c93df5d 1196 drop = true;
6c99f254
SW		 1197 }
1198 if (!list_empty(&ci->i_flushing_item)) {
3e0708b9
YZ		 1199 pr_warn_ratelimited(
1200 " dropping dirty+flushing %s state for %p %lld\n",
6c99f254
SW		 1201 ceph_cap_string(ci->i_flushing_caps),
1202 inode, ceph_ino(inode));
1203 ci->i_flushing_caps = 0;
1204 list_del_init(&ci->i_flushing_item);
1205 mdsc->num_cap_flushing--;
6c93df5d 1206 drop = true;
6c99f254 1207 }
6c99f254 1208 spin_unlock(&mdsc->cap_dirty_lock);
553adfd9 1209
f66fd9f0 1210 if (!ci->i_dirty_caps && ci->i_prealloc_cap_flush) {
e4500b5e 1211 list_add(&ci->i_prealloc_cap_flush->i_list, &to_remove);
f66fd9f0
YZ		 1212 ci->i_prealloc_cap_flush = NULL;
1213 }
6c99f254 1214 }
be655596 1215 spin_unlock(&ci->i_ceph_lock);
553adfd9
YZ		 1216 while (!list_empty(&to_remove)) {
1217 struct ceph_cap_flush *cf;
1218 cf = list_first_entry(&to_remove,
e4500b5e
YZ		 1219 struct ceph_cap_flush, i_list);
1220 list_del(&cf->i_list);
f66fd9f0 1221 ceph_free_cap_flush(cf);
553adfd9 1222 }
77310320
YZ		 1223
1224 wake_up_all(&ci->i_cap_wq);
6c93df5d
YZ		 1225 if (invalidate)
1226 ceph_queue_invalidate(inode);
77310320 1227 if (drop)
6c99f254 1228 iput(inode);
2f2dc053
SW		 1229 return 0;
1230}
1231
1232/*
1233 * caller must hold session s_mutex
1234 */
1235static void remove_session_caps(struct ceph_mds_session *session)
1236{
6c93df5d
YZ		 1237 struct ceph_fs_client *fsc = session->s_mdsc->fsc;
1238 struct super_block *sb = fsc->sb;
2f2dc053 1239 dout("remove_session_caps on %p\n", session);
6c93df5d 1240 iterate_session_caps(session, remove_session_caps_cb, fsc);
6f60f889 1241
c8799fc4
YZ		 1242 wake_up_all(&fsc->mdsc->cap_flushing_wq);
1243
6f60f889
YZ		 1244 spin_lock(&session->s_cap_lock);
1245 if (session->s_nr_caps > 0) {
6f60f889
YZ		 1246 struct inode *inode;
1247 struct ceph_cap *cap, *prev = NULL;
1248 struct ceph_vino vino;
1249 /*
1250 * iterate_session_caps() skips inodes that are being
1251 * deleted, we need to wait until deletions are complete.
1252 * __wait_on_freeing_inode() is designed for the job,
1253 * but it is not exported, so use lookup inode function
1254 * to access it.
1255 */
1256 while (!list_empty(&session->s_caps)) {
1257 cap = list_entry(session->s_caps.next,
1258 struct ceph_cap, session_caps);
1259 if (cap == prev)
1260 break;
1261 prev = cap;
1262 vino = cap->ci->i_vino;
1263 spin_unlock(&session->s_cap_lock);
1264
ed284c49 1265 inode = ceph_find_inode(sb, vino);
6f60f889
YZ		 1266 iput(inode);
1267
1268 spin_lock(&session->s_cap_lock);
1269 }
1270 }
745a8e3b
YZ		 1271
1272 // drop cap expires and unlock s_cap_lock
1273 cleanup_cap_releases(session->s_mdsc, session);
6f60f889 1274
2f2dc053 1275 BUG_ON(session->s_nr_caps > 0);
6c99f254 1276 BUG_ON(!list_empty(&session->s_cap_flushing));
2f2dc053
SW		 1277}
1278
1279/*
1280 * wake up any threads waiting on this session's caps. if the cap is
1281 * old (didn't get renewed on the client reconnect), remove it now.
1282 *
1283 * caller must hold s_mutex.
1284 */
1285static int wake_up_session_cb(struct inode *inode, struct ceph_cap *cap,
1286 void *arg)
1287{
0dc2570f
SW		 1288 struct ceph_inode_info *ci = ceph_inode(inode);
1289
0dc2570f 1290 if (arg) {
be655596 1291 spin_lock(&ci->i_ceph_lock);
0dc2570f
SW		 1292 ci->i_wanted_max_size = 0;
1293 ci->i_requested_max_size = 0;
be655596 1294 spin_unlock(&ci->i_ceph_lock);
0dc2570f 1295 }
e5360309 1296 wake_up_all(&ci->i_cap_wq);
2f2dc053
SW		 1297 return 0;
1298}
1299
0dc2570f
SW		 1300static void wake_up_session_caps(struct ceph_mds_session *session,
1301 int reconnect)
2f2dc053
SW		 1302{
1303 dout("wake_up_session_caps %p mds%d\n", session, session->s_mds);
0dc2570f
SW		 1304 iterate_session_caps(session, wake_up_session_cb,
1305 (void *)(unsigned long)reconnect);
2f2dc053
SW		 1306}
1307
1308/*
1309 * Send periodic message to MDS renewing all currently held caps. The
1310 * ack will reset the expiration for all caps from this session.
1311 *
1312 * caller holds s_mutex
1313 */
1314static int send_renew_caps(struct ceph_mds_client *mdsc,
1315 struct ceph_mds_session *session)
1316{
1317 struct ceph_msg *msg;
1318 int state;
1319
1320 if (time_after_eq(jiffies, session->s_cap_ttl) &&
1321 time_after_eq(session->s_cap_ttl, session->s_renew_requested))
1322 pr_info("mds%d caps stale\n", session->s_mds);
e4cb4cb8 1323 session->s_renew_requested = jiffies;
2f2dc053
SW		 1324
1325 /* do not try to renew caps until a recovering mds has reconnected
1326 * with its clients. */
1327 state = ceph_mdsmap_get_state(mdsc->mdsmap, session->s_mds);
1328 if (state < CEPH_MDS_STATE_RECONNECT) {
1329 dout("send_renew_caps ignoring mds%d (%s)\n",
1330 session->s_mds, ceph_mds_state_name(state));
1331 return 0;
1332 }
1333
1334 dout("send_renew_caps to mds%d (%s)\n", session->s_mds,
1335 ceph_mds_state_name(state));
2f2dc053
SW		 1336 msg = create_session_msg(CEPH_SESSION_REQUEST_RENEWCAPS,
1337 ++session->s_renew_seq);
a79832f2
SW		 1338 if (!msg)
1339 return -ENOMEM;
2f2dc053
SW		 1340 ceph_con_send(&session->s_con, msg);
1341 return 0;
1342}
1343
186e4f7a
YZ		 1344static int send_flushmsg_ack(struct ceph_mds_client *mdsc,
1345 struct ceph_mds_session *session, u64 seq)
1346{
1347 struct ceph_msg *msg;
1348
1349 dout("send_flushmsg_ack to mds%d (%s)s seq %lld\n",
a687ecaf 1350 session->s_mds, ceph_session_state_name(session->s_state), seq);
186e4f7a
YZ		 1351 msg = create_session_msg(CEPH_SESSION_FLUSHMSG_ACK, seq);
1352 if (!msg)
1353 return -ENOMEM;
1354 ceph_con_send(&session->s_con, msg);
1355 return 0;
1356}
1357
1358
2f2dc053
SW		 1359/*
1360 * Note new cap ttl, and any transition from stale -> not stale (fresh?).
0dc2570f
SW		 1361 *
1362 * Called under session->s_mutex
2f2dc053
SW		 1363 */
1364static void renewed_caps(struct ceph_mds_client *mdsc,
1365 struct ceph_mds_session *session, int is_renew)
1366{
1367 int was_stale;
1368 int wake = 0;
1369
1370 spin_lock(&session->s_cap_lock);
1ce208a6 1371 was_stale = is_renew && time_after_eq(jiffies, session->s_cap_ttl);
2f2dc053
SW		 1372
1373 session->s_cap_ttl = session->s_renew_requested +
1374 mdsc->mdsmap->m_session_timeout*HZ;
1375
1376 if (was_stale) {
1377 if (time_before(jiffies, session->s_cap_ttl)) {
1378 pr_info("mds%d caps renewed\n", session->s_mds);
1379 wake = 1;
1380 } else {
1381 pr_info("mds%d caps still stale\n", session->s_mds);
1382 }
1383 }
1384 dout("renewed_caps mds%d ttl now %lu, was %s, now %s\n",
1385 session->s_mds, session->s_cap_ttl, was_stale ? "stale" : "fresh",
1386 time_before(jiffies, session->s_cap_ttl) ? "stale" : "fresh");
1387 spin_unlock(&session->s_cap_lock);
1388
1389 if (wake)
0dc2570f 1390 wake_up_session_caps(session, 0);
2f2dc053
SW		 1391}
1392
1393/*
1394 * send a session close request
1395 */
1396static int request_close_session(struct ceph_mds_client *mdsc,
1397 struct ceph_mds_session *session)
1398{
1399 struct ceph_msg *msg;
2f2dc053
SW		 1400
1401 dout("request_close_session mds%d state %s seq %lld\n",
a687ecaf 1402 session->s_mds, ceph_session_state_name(session->s_state),
2f2dc053
SW		 1403 session->s_seq);
1404 msg = create_session_msg(CEPH_SESSION_REQUEST_CLOSE, session->s_seq);
a79832f2
SW		 1405 if (!msg)
1406 return -ENOMEM;
1407 ceph_con_send(&session->s_con, msg);
fcff415c 1408 return 1;
2f2dc053
SW		 1409}
1410
1411/*
1412 * Called with s_mutex held.
1413 */
1414static int __close_session(struct ceph_mds_client *mdsc,
1415 struct ceph_mds_session *session)
1416{
1417 if (session->s_state >= CEPH_MDS_SESSION_CLOSING)
1418 return 0;
1419 session->s_state = CEPH_MDS_SESSION_CLOSING;
1420 return request_close_session(mdsc, session);
1421}
1422
1423/*
1424 * Trim old(er) caps.
1425 *
1426 * Because we can't cache an inode without one or more caps, we do
1427 * this indirectly: if a cap is unused, we prune its aliases, at which
1428 * point the inode will hopefully get dropped to.
1429 *
1430 * Yes, this is a bit sloppy. Our only real goal here is to respond to
1431 * memory pressure from the MDS, though, so it needn't be perfect.
1432 */
1433static int trim_caps_cb(struct inode *inode, struct ceph_cap *cap, void *arg)
1434{
1435 struct ceph_mds_session *session = arg;
1436 struct ceph_inode_info *ci = ceph_inode(inode);
979abfdd 1437 int used, wanted, oissued, mine;
2f2dc053
SW		 1438
1439 if (session->s_trim_caps <= 0)
1440 return -1;
1441
be655596 1442 spin_lock(&ci->i_ceph_lock);
2f2dc053
SW		 1443 mine = cap->issued | cap->implemented;
1444 used = __ceph_caps_used(ci);
979abfdd 1445 wanted = __ceph_caps_file_wanted(ci);
2f2dc053
SW		 1446 oissued = __ceph_caps_issued_other(ci, cap);
1447
979abfdd 1448 dout("trim_caps_cb %p cap %p mine %s oissued %s used %s wanted %s\n",
2f2dc053 1449 inode, cap, ceph_cap_string(mine), ceph_cap_string(oissued),
979abfdd
YZ		 1450 ceph_cap_string(used), ceph_cap_string(wanted));
1451 if (cap == ci->i_auth_cap) {
622f3e25
YZ		 1452 if (ci->i_dirty_caps || ci->i_flushing_caps ||
1453 !list_empty(&ci->i_cap_snaps))
979abfdd
YZ		 1454 goto out;
1455 if ((used | wanted) & CEPH_CAP_ANY_WR)
1456 goto out;
1457 }
5e804ac4
YZ		 1458 /* The inode has cached pages, but it's no longer used.
1459 * we can safely drop it */
1460 if (wanted == 0 && used == CEPH_CAP_FILE_CACHE &&
1461 !(oissued & CEPH_CAP_FILE_CACHE)) {
1462 used = 0;
1463 oissued = 0;
1464 }
979abfdd 1465 if ((used | wanted) & ~oissued & mine)
2f2dc053
SW		 1466 goto out; /* we need these caps */
1467
1468 session->s_trim_caps--;
1469 if (oissued) {
1470 /* we aren't the only cap.. just remove us */
a096b09a 1471 __ceph_remove_cap(cap, true);
2f2dc053 1472 } else {
5e804ac4 1473 /* try dropping referring dentries */
be655596 1474 spin_unlock(&ci->i_ceph_lock);
2f2dc053
SW		 1475 d_prune_aliases(inode);
1476 dout("trim_caps_cb %p cap %p pruned, count now %d\n",
1477 inode, cap, atomic_read(&inode->i_count));
1478 return 0;
1479 }
1480
1481out:
be655596 1482 spin_unlock(&ci->i_ceph_lock);
2f2dc053
SW		 1483 return 0;
1484}
1485
1486/*
1487 * Trim session cap count down to some max number.
1488 */
1489static int trim_caps(struct ceph_mds_client *mdsc,
1490 struct ceph_mds_session *session,
1491 int max_caps)
1492{
1493 int trim_caps = session->s_nr_caps - max_caps;
1494
1495 dout("trim_caps mds%d start: %d / %d, trim %d\n",
1496 session->s_mds, session->s_nr_caps, max_caps, trim_caps);
1497 if (trim_caps > 0) {
1498 session->s_trim_caps = trim_caps;
1499 iterate_session_caps(session, trim_caps_cb, session);
1500 dout("trim_caps mds%d done: %d / %d, trimmed %d\n",
1501 session->s_mds, session->s_nr_caps, max_caps,
1502 trim_caps - session->s_trim_caps);
5dacf091 1503 session->s_trim_caps = 0;
2f2dc053 1504 }
a56371d9 1505
a56371d9 1506 ceph_send_cap_releases(mdsc, session);
2f2dc053
SW		 1507 return 0;
1508}
1509
8310b089
YZ		 1510static int check_caps_flush(struct ceph_mds_client *mdsc,
1511 u64 want_flush_tid)
1512{
8310b089
YZ		 1513 int ret = 1;
1514
1515 spin_lock(&mdsc->cap_dirty_lock);
e4500b5e
YZ		 1516 if (!list_empty(&mdsc->cap_flush_list)) {
1517 struct ceph_cap_flush *cf =
1518 list_first_entry(&mdsc->cap_flush_list,
1519 struct ceph_cap_flush, g_list);
1520 if (cf->tid <= want_flush_tid) {
1521 dout("check_caps_flush still flushing tid "
1522 "%llu <= %llu\n", cf->tid, want_flush_tid);
1523 ret = 0;
1524 }
8310b089
YZ		 1525 }
1526 spin_unlock(&mdsc->cap_dirty_lock);
1527 return ret;
d3383a8e
YZ		 1528}
1529
2f2dc053
SW		 1530/*
1531 * flush all dirty inode data to disk.
1532 *
8310b089 1533 * returns true if we've flushed through want_flush_tid
2f2dc053 1534 */
affbc19a 1535static void wait_caps_flush(struct ceph_mds_client *mdsc,
0e294387 1536 u64 want_flush_tid)
2f2dc053 1537{
0e294387 1538 dout("check_caps_flush want %llu\n", want_flush_tid);
8310b089
YZ		 1539
1540 wait_event(mdsc->cap_flushing_wq,
1541 check_caps_flush(mdsc, want_flush_tid));
1542
1543 dout("check_caps_flush ok, flushed thru %llu\n", want_flush_tid);
2f2dc053
SW		 1544}
1545
1546/*
1547 * called under s_mutex
1548 */
3d7ded4d
SW		 1549void ceph_send_cap_releases(struct ceph_mds_client *mdsc,
1550 struct ceph_mds_session *session)
2f2dc053 1551{
745a8e3b
YZ		 1552 struct ceph_msg *msg = NULL;
1553 struct ceph_mds_cap_release *head;
1554 struct ceph_mds_cap_item *item;
1555 struct ceph_cap *cap;
1556 LIST_HEAD(tmp_list);
1557 int num_cap_releases;
2f2dc053 1558
0f8605f2 1559 spin_lock(&session->s_cap_lock);
745a8e3b
YZ		 1560again:
1561 list_splice_init(&session->s_cap_releases, &tmp_list);
1562 num_cap_releases = session->s_num_cap_releases;
1563 session->s_num_cap_releases = 0;
2f2dc053 1564 spin_unlock(&session->s_cap_lock);
e01a5946 1565
745a8e3b
YZ		 1566 while (!list_empty(&tmp_list)) {
1567 if (!msg) {
1568 msg = ceph_msg_new(CEPH_MSG_CLIENT_CAPRELEASE,
09cbfeaf 1569 PAGE_SIZE, GFP_NOFS, false);
745a8e3b
YZ		 1570 if (!msg)
1571 goto out_err;
1572 head = msg->front.iov_base;
1573 head->num = cpu_to_le32(0);
1574 msg->front.iov_len = sizeof(*head);
1575 }
1576 cap = list_first_entry(&tmp_list, struct ceph_cap,
1577 session_caps);
1578 list_del(&cap->session_caps);
1579 num_cap_releases--;
e01a5946 1580
00bd8edb 1581 head = msg->front.iov_base;
745a8e3b
YZ		 1582 le32_add_cpu(&head->num, 1);
1583 item = msg->front.iov_base + msg->front.iov_len;
1584 item->ino = cpu_to_le64(cap->cap_ino);
1585 item->cap_id = cpu_to_le64(cap->cap_id);
1586 item->migrate_seq = cpu_to_le32(cap->mseq);
1587 item->seq = cpu_to_le32(cap->issue_seq);
1588 msg->front.iov_len += sizeof(*item);
1589
1590 ceph_put_cap(mdsc, cap);
1591
1592 if (le32_to_cpu(head->num) == CEPH_CAPS_PER_RELEASE) {
1593 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
1594 dout("send_cap_releases mds%d %p\n", session->s_mds, msg);
1595 ceph_con_send(&session->s_con, msg);
1596 msg = NULL;
1597 }
00bd8edb 1598 }
e01a5946 1599
745a8e3b 1600 BUG_ON(num_cap_releases != 0);
e01a5946 1601
745a8e3b
YZ		 1602 spin_lock(&session->s_cap_lock);
1603 if (!list_empty(&session->s_cap_releases))
1604 goto again;
1605 spin_unlock(&session->s_cap_lock);
1606
1607 if (msg) {
1608 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
1609 dout("send_cap_releases mds%d %p\n", session->s_mds, msg);
1610 ceph_con_send(&session->s_con, msg);
e01a5946 1611 }
745a8e3b
YZ		 1612 return;
1613out_err:
1614 pr_err("send_cap_releases mds%d, failed to allocate message\n",
1615 session->s_mds);
1616 spin_lock(&session->s_cap_lock);
1617 list_splice(&tmp_list, &session->s_cap_releases);
1618 session->s_num_cap_releases += num_cap_releases;
1619 spin_unlock(&session->s_cap_lock);
e01a5946
SW		 1620}
1621
2f2dc053
SW		 1622/*
1623 * requests
1624 */
1625
54008399
YZ		 1626int ceph_alloc_readdir_reply_buffer(struct ceph_mds_request *req,
1627 struct inode *dir)
1628{
1629 struct ceph_inode_info *ci = ceph_inode(dir);
1630 struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1631 struct ceph_mount_options *opt = req->r_mdsc->fsc->mount_options;
2a5beea3 1632 size_t size = sizeof(struct ceph_mds_reply_dir_entry);
54008399
YZ		 1633 int order, num_entries;
1634
1635 spin_lock(&ci->i_ceph_lock);
1636 num_entries = ci->i_files + ci->i_subdirs;
1637 spin_unlock(&ci->i_ceph_lock);
1638 num_entries = max(num_entries, 1);
1639 num_entries = min(num_entries, opt->max_readdir);
1640
1641 order = get_order(size * num_entries);
1642 while (order >= 0) {
2a5beea3
YZ		 1643 rinfo->dir_entries = (void*)__get_free_pages(GFP_KERNEL |
1644 __GFP_NOWARN,
1645 order);
1646 if (rinfo->dir_entries)
54008399
YZ		 1647 break;
1648 order--;
1649 }
2a5beea3 1650 if (!rinfo->dir_entries)
54008399
YZ		 1651 return -ENOMEM;
1652
1653 num_entries = (PAGE_SIZE << order) / size;
1654 num_entries = min(num_entries, opt->max_readdir);
1655
1656 rinfo->dir_buf_size = PAGE_SIZE << order;
1657 req->r_num_caps = num_entries + 1;
1658 req->r_args.readdir.max_entries = cpu_to_le32(num_entries);
1659 req->r_args.readdir.max_bytes = cpu_to_le32(opt->max_readdir_bytes);
1660 return 0;
1661}
1662
2f2dc053
SW		 1663/*
1664 * Create an mds request.
1665 */
1666struct ceph_mds_request *
1667ceph_mdsc_create_request(struct ceph_mds_client *mdsc, int op, int mode)
1668{
1669 struct ceph_mds_request *req = kzalloc(sizeof(*req), GFP_NOFS);
1670
1671 if (!req)
1672 return ERR_PTR(-ENOMEM);
1673
b4556396 1674 mutex_init(&req->r_fill_mutex);
37151668 1675 req->r_mdsc = mdsc;
2f2dc053
SW		 1676 req->r_started = jiffies;
1677 req->r_resend_mds = -1;
1678 INIT_LIST_HEAD(&req->r_unsafe_dir_item);
68cd5b4b 1679 INIT_LIST_HEAD(&req->r_unsafe_target_item);
2f2dc053 1680 req->r_fmode = -1;
153c8e6b 1681 kref_init(&req->r_kref);
fcd00b68 1682 RB_CLEAR_NODE(&req->r_node);
2f2dc053
SW		 1683 INIT_LIST_HEAD(&req->r_wait);
1684 init_completion(&req->r_completion);
1685 init_completion(&req->r_safe_completion);
1686 INIT_LIST_HEAD(&req->r_unsafe_item);
1687
8bbd4714 1688 req->r_stamp = current_fs_time(mdsc->fsc->sb);
b8e69066 1689
2f2dc053
SW		 1690 req->r_op = op;
1691 req->r_direct_mode = mode;
1692 return req;
1693}
1694
1695/*
44ca18f2 1696 * return oldest (lowest) request, tid in request tree, 0 if none.
2f2dc053
SW		 1697 *
1698 * called under mdsc->mutex.
1699 */
44ca18f2
SW		 1700static struct ceph_mds_request *__get_oldest_req(struct ceph_mds_client *mdsc)
1701{
1702 if (RB_EMPTY_ROOT(&mdsc->request_tree))
1703 return NULL;
1704 return rb_entry(rb_first(&mdsc->request_tree),
1705 struct ceph_mds_request, r_node);
1706}
1707
e8a7b8b1 1708static inline u64 __get_oldest_tid(struct ceph_mds_client *mdsc)
2f2dc053 1709{
e8a7b8b1 1710 return mdsc->oldest_tid;
2f2dc053
SW		 1711}
1712
1713/*
1714 * Build a dentry's path. Allocate on heap; caller must kfree. Based
1715 * on build_path_from_dentry in fs/cifs/dir.c.
1716 *
1717 * If @stop_on_nosnap, generate path relative to the first non-snapped
1718 * inode.
1719 *
1720 * Encode hidden .snap dirs as a double /, i.e.
1721 * foo/.snap/bar -> foo//bar
1722 */
1723char *ceph_mdsc_build_path(struct dentry *dentry, int *plen, u64 *base,
1724 int stop_on_nosnap)
1725{
1726 struct dentry *temp;
1727 char *path;
1728 int len, pos;
1b71fe2e 1729 unsigned seq;
2f2dc053
SW		 1730
1731 if (dentry == NULL)
1732 return ERR_PTR(-EINVAL);
1733
1734retry:
1735 len = 0;
1b71fe2e
AV		 1736 seq = read_seqbegin(&rename_lock);
1737 rcu_read_lock();
2f2dc053 1738 for (temp = dentry; !IS_ROOT(temp);) {
2b0143b5 1739 struct inode *inode = d_inode(temp);
2f2dc053
SW		 1740 if (inode && ceph_snap(inode) == CEPH_SNAPDIR)
1741 len++; /* slash only */
1742 else if (stop_on_nosnap && inode &&
1743 ceph_snap(inode) == CEPH_NOSNAP)
1744 break;
1745 else
1746 len += 1 + temp->d_name.len;
1747 temp = temp->d_parent;
2f2dc053 1748 }
1b71fe2e 1749 rcu_read_unlock();
2f2dc053
SW		 1750 if (len)
1751 len--; /* no leading '/' */
1752
1753 path = kmalloc(len+1, GFP_NOFS);
1754 if (path == NULL)
1755 return ERR_PTR(-ENOMEM);
1756 pos = len;
1757 path[pos] = 0; /* trailing null */
1b71fe2e 1758 rcu_read_lock();
2f2dc053 1759 for (temp = dentry; !IS_ROOT(temp) && pos != 0; ) {
1b71fe2e 1760 struct inode *inode;
2f2dc053 1761
1b71fe2e 1762 spin_lock(&temp->d_lock);
2b0143b5 1763 inode = d_inode(temp);
2f2dc053 1764 if (inode && ceph_snap(inode) == CEPH_SNAPDIR) {
104648ad 1765 dout("build_path path+%d: %p SNAPDIR\n",
2f2dc053
SW		 1766 pos, temp);
1767 } else if (stop_on_nosnap && inode &&
1768 ceph_snap(inode) == CEPH_NOSNAP) {
9d5a09e6 1769 spin_unlock(&temp->d_lock);
2f2dc053
SW		 1770 break;
1771 } else {
1772 pos -= temp->d_name.len;
1b71fe2e
AV		 1773 if (pos < 0) {
1774 spin_unlock(&temp->d_lock);
2f2dc053 1775 break;
1b71fe2e 1776 }
2f2dc053
SW		 1777 strncpy(path + pos, temp->d_name.name,
1778 temp->d_name.len);
2f2dc053 1779 }
1b71fe2e 1780 spin_unlock(&temp->d_lock);
2f2dc053
SW		 1781 if (pos)
1782 path[--pos] = '/';
1783 temp = temp->d_parent;
2f2dc053 1784 }
1b71fe2e
AV		 1785 rcu_read_unlock();
1786 if (pos != 0 || read_seqretry(&rename_lock, seq)) {
104648ad 1787 pr_err("build_path did not end path lookup where "
2f2dc053
SW		 1788 "expected, namelen is %d, pos is %d\n", len, pos);
1789 /* presumably this is only possible if racing with a
1790 rename of one of the parent directories (we can not
1791 lock the dentries above us to prevent this, but
1792 retrying should be harmless) */
1793 kfree(path);
1794 goto retry;
1795 }
1796
2b0143b5 1797 *base = ceph_ino(d_inode(temp));
2f2dc053 1798 *plen = len;
104648ad 1799 dout("build_path on %p %d built %llx '%.*s'\n",
84d08fa8 1800 dentry, d_count(dentry), *base, len, path);
2f2dc053
SW		 1801 return path;
1802}
1803
fd36a717 1804static int build_dentry_path(struct dentry *dentry, struct inode *dir,
2f2dc053
SW		 1805 const char **ppath, int *ppathlen, u64 *pino,
1806 int *pfreepath)
1807{
1808 char *path;
1809
c6b0b656 1810 rcu_read_lock();
fd36a717
JL		 1811 if (!dir)
1812 dir = d_inode_rcu(dentry->d_parent);
c6b0b656
JL		 1813 if (dir && ceph_snap(dir) == CEPH_NOSNAP) {
1814 *pino = ceph_ino(dir);
1815 rcu_read_unlock();
2f2dc053
SW		 1816 *ppath = dentry->d_name.name;
1817 *ppathlen = dentry->d_name.len;
1818 return 0;
1819 }
c6b0b656 1820 rcu_read_unlock();
2f2dc053
SW		 1821 path = ceph_mdsc_build_path(dentry, ppathlen, pino, 1);
1822 if (IS_ERR(path))
1823 return PTR_ERR(path);
1824 *ppath = path;
1825 *pfreepath = 1;
1826 return 0;
1827}
1828
1829static int build_inode_path(struct inode *inode,
1830 const char **ppath, int *ppathlen, u64 *pino,
1831 int *pfreepath)
1832{
1833 struct dentry *dentry;
1834 char *path;
1835
1836 if (ceph_snap(inode) == CEPH_NOSNAP) {
1837 *pino = ceph_ino(inode);
1838 *ppathlen = 0;
1839 return 0;
1840 }
1841 dentry = d_find_alias(inode);
1842 path = ceph_mdsc_build_path(dentry, ppathlen, pino, 1);
1843 dput(dentry);
1844 if (IS_ERR(path))
1845 return PTR_ERR(path);
1846 *ppath = path;
1847 *pfreepath = 1;
1848 return 0;
1849}
1850
1851/*
1852 * request arguments may be specified via an inode *, a dentry *, or
1853 * an explicit ino+path.
1854 */
1855static int set_request_path_attr(struct inode *rinode, struct dentry *rdentry,
fd36a717
JL		 1856 struct inode *rdiri, const char *rpath,
1857 u64 rino, const char **ppath, int *pathlen,
2f2dc053
SW		 1858 u64 *ino, int *freepath)
1859{
1860 int r = 0;
1861
1862 if (rinode) {
1863 r = build_inode_path(rinode, ppath, pathlen, ino, freepath);
1864 dout(" inode %p %llx.%llx\n", rinode, ceph_ino(rinode),
1865 ceph_snap(rinode));
1866 } else if (rdentry) {
fd36a717
JL		 1867 r = build_dentry_path(rdentry, rdiri, ppath, pathlen, ino,
1868 freepath);
2f2dc053
SW		 1869 dout(" dentry %p %llx/%.*s\n", rdentry, *ino, *pathlen,
1870 *ppath);
795858db 1871 } else if (rpath || rino) {
2f2dc053
SW		 1872 *ino = rino;
1873 *ppath = rpath;
b000056a 1874 *pathlen = rpath ? strlen(rpath) : 0;
2f2dc053
SW		 1875 dout(" path %.*s\n", *pathlen, rpath);
1876 }
1877
1878 return r;
1879}
1880
1881/*
1882 * called under mdsc->mutex
1883 */
1884static struct ceph_msg *create_request_message(struct ceph_mds_client *mdsc,
1885 struct ceph_mds_request *req,
6e6f0923 1886 int mds, bool drop_cap_releases)
2f2dc053
SW		 1887{
1888 struct ceph_msg *msg;
1889 struct ceph_mds_request_head *head;
1890 const char *path1 = NULL;
1891 const char *path2 = NULL;
1892 u64 ino1 = 0, ino2 = 0;
1893 int pathlen1 = 0, pathlen2 = 0;
1894 int freepath1 = 0, freepath2 = 0;
1895 int len;
1896 u16 releases;
1897 void *p, *end;
1898 int ret;
1899
1900 ret = set_request_path_attr(req->r_inode, req->r_dentry,
3dd69aab 1901 req->r_parent, req->r_path1, req->r_ino1.ino,
2f2dc053
SW		 1902 &path1, &pathlen1, &ino1, &freepath1);
1903 if (ret < 0) {
1904 msg = ERR_PTR(ret);
1905 goto out;
1906 }
1907
1908 ret = set_request_path_attr(NULL, req->r_old_dentry,
fd36a717 1909 req->r_old_dentry_dir,
2f2dc053
SW		 1910 req->r_path2, req->r_ino2.ino,
1911 &path2, &pathlen2, &ino2, &freepath2);
1912 if (ret < 0) {
1913 msg = ERR_PTR(ret);
1914 goto out_free1;
1915 }
1916
1917 len = sizeof(*head) +
b8e69066 1918 pathlen1 + pathlen2 + 2*(1 + sizeof(u32) + sizeof(u64)) +
777d738a 1919 sizeof(struct ceph_timespec);
2f2dc053
SW		 1920
1921 /* calculate (max) length for cap releases */
1922 len += sizeof(struct ceph_mds_request_release) *
1923 (!!req->r_inode_drop + !!req->r_dentry_drop +
1924 !!req->r_old_inode_drop + !!req->r_old_dentry_drop);
1925 if (req->r_dentry_drop)
1926 len += req->r_dentry->d_name.len;
1927 if (req->r_old_dentry_drop)
1928 len += req->r_old_dentry->d_name.len;
1929
b61c2763 1930 msg = ceph_msg_new(CEPH_MSG_CLIENT_REQUEST, len, GFP_NOFS, false);
a79832f2
SW		 1931 if (!msg) {
1932 msg = ERR_PTR(-ENOMEM);
2f2dc053 1933 goto out_free2;
a79832f2 1934 }
2f2dc053 1935
7cfa0313 1936 msg->hdr.version = cpu_to_le16(2);
6df058c0
SW		 1937 msg->hdr.tid = cpu_to_le64(req->r_tid);
1938
2f2dc053
SW		 1939 head = msg->front.iov_base;
1940 p = msg->front.iov_base + sizeof(*head);
1941 end = msg->front.iov_base + msg->front.iov_len;
1942
1943 head->mdsmap_epoch = cpu_to_le32(mdsc->mdsmap->m_epoch);
1944 head->op = cpu_to_le32(req->r_op);
ff3d0046
EB		 1945 head->caller_uid = cpu_to_le32(from_kuid(&init_user_ns, req->r_uid));
1946 head->caller_gid = cpu_to_le32(from_kgid(&init_user_ns, req->r_gid));
2f2dc053
SW		 1947 head->args = req->r_args;
1948
1949 ceph_encode_filepath(&p, end, ino1, path1);
1950 ceph_encode_filepath(&p, end, ino2, path2);
1951
e979cf50
SW		 1952 /* make note of release offset, in case we need to replay */
1953 req->r_request_release_offset = p - msg->front.iov_base;
1954
2f2dc053
SW		 1955 /* cap releases */
1956 releases = 0;
1957 if (req->r_inode_drop)
1958 releases += ceph_encode_inode_release(&p,
2b0143b5 1959 req->r_inode ? req->r_inode : d_inode(req->r_dentry),
2f2dc053
SW		 1960 mds, req->r_inode_drop, req->r_inode_unless, 0);
1961 if (req->r_dentry_drop)
1962 releases += ceph_encode_dentry_release(&p, req->r_dentry,
3dd69aab 1963 req->r_parent, mds, req->r_dentry_drop,
ca6c8ae0 1964 req->r_dentry_unless);
2f2dc053
SW		 1965 if (req->r_old_dentry_drop)
1966 releases += ceph_encode_dentry_release(&p, req->r_old_dentry,
ca6c8ae0
JL		 1967 req->r_old_dentry_dir, mds,
1968 req->r_old_dentry_drop,
1969 req->r_old_dentry_unless);
2f2dc053
SW		 1970 if (req->r_old_inode_drop)
1971 releases += ceph_encode_inode_release(&p,
2b0143b5 1972 d_inode(req->r_old_dentry),
2f2dc053 1973 mds, req->r_old_inode_drop, req->r_old_inode_unless, 0);
6e6f0923
YZ		 1974
1975 if (drop_cap_releases) {
1976 releases = 0;
1977 p = msg->front.iov_base + req->r_request_release_offset;
1978 }
1979
2f2dc053
SW		 1980 head->num_releases = cpu_to_le16(releases);
1981
b8e69066 1982 /* time stamp */
1f041a89
YZ		 1983 {
1984 struct ceph_timespec ts;
1985 ceph_encode_timespec(&ts, &req->r_stamp);
1986 ceph_encode_copy(&p, &ts, sizeof(ts));
1987 }
b8e69066 1988
2f2dc053
SW		 1989 BUG_ON(p > end);
1990 msg->front.iov_len = p - msg->front.iov_base;
1991 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
1992
25e6bae3
YZ		 1993 if (req->r_pagelist) {
1994 struct ceph_pagelist *pagelist = req->r_pagelist;
0e1a5ee6 1995 refcount_inc(&pagelist->refcnt);
25e6bae3
YZ		 1996 ceph_msg_data_add_pagelist(msg, pagelist);
1997 msg->hdr.data_len = cpu_to_le32(pagelist->length);
1998 } else {
1999 msg->hdr.data_len = 0;
ebf18f47 2000 }
02afca6c 2001
2f2dc053
SW		 2002 msg->hdr.data_off = cpu_to_le16(0);
2003
2004out_free2:
2005 if (freepath2)
2006 kfree((char *)path2);
2007out_free1:
2008 if (freepath1)
2009 kfree((char *)path1);
2010out:
2011 return msg;
2012}
2013
2014/*
2015 * called under mdsc->mutex if error, under no mutex if
2016 * success.
2017 */
2018static void complete_request(struct ceph_mds_client *mdsc,
2019 struct ceph_mds_request *req)
2020{
2021 if (req->r_callback)
2022 req->r_callback(mdsc, req);
2023 else
03066f23 2024 complete_all(&req->r_completion);
2f2dc053
SW		 2025}
2026
2027/*
2028 * called under mdsc->mutex
2029 */
2030static int __prepare_send_request(struct ceph_mds_client *mdsc,
2031 struct ceph_mds_request *req,
6e6f0923 2032 int mds, bool drop_cap_releases)
2f2dc053
SW		 2033{
2034 struct ceph_mds_request_head *rhead;
2035 struct ceph_msg *msg;
2036 int flags = 0;
2037
2f2dc053 2038 req->r_attempts++;
e55b71f8
GF		 2039 if (req->r_inode) {
2040 struct ceph_cap *cap =
2041 ceph_get_cap_for_mds(ceph_inode(req->r_inode), mds);
2042
2043 if (cap)
2044 req->r_sent_on_mseq = cap->mseq;
2045 else
2046 req->r_sent_on_mseq = -1;
2047 }
2f2dc053
SW		 2048 dout("prepare_send_request %p tid %lld %s (attempt %d)\n", req,
2049 req->r_tid, ceph_mds_op_name(req->r_op), req->r_attempts);
2050
bc2de10d 2051 if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) {
c5c9a0bf 2052 void *p;
01a92f17
SW		 2053 /*
2054 * Replay. Do not regenerate message (and rebuild
2055 * paths, etc.); just use the original message.
2056 * Rebuilding paths will break for renames because
2057 * d_move mangles the src name.
2058 */
2059 msg = req->r_request;
2060 rhead = msg->front.iov_base;
2061
2062 flags = le32_to_cpu(rhead->flags);
2063 flags |= CEPH_MDS_FLAG_REPLAY;
2064 rhead->flags = cpu_to_le32(flags);
2065
2066 if (req->r_target_inode)
2067 rhead->ino = cpu_to_le64(ceph_ino(req->r_target_inode));
2068
2069 rhead->num_retry = req->r_attempts - 1;
e979cf50
SW		 2070
2071 /* remove cap/dentry releases from message */
2072 rhead->num_releases = 0;
c5c9a0bf
YZ		 2073
2074 /* time stamp */
2075 p = msg->front.iov_base + req->r_request_release_offset;
1f041a89
YZ		 2076 {
2077 struct ceph_timespec ts;
2078 ceph_encode_timespec(&ts, &req->r_stamp);
2079 ceph_encode_copy(&p, &ts, sizeof(ts));
2080 }
c5c9a0bf
YZ		 2081
2082 msg->front.iov_len = p - msg->front.iov_base;
2083 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
01a92f17
SW		 2084 return 0;
2085 }
2086
2f2dc053
SW		 2087 if (req->r_request) {
2088 ceph_msg_put(req->r_request);
2089 req->r_request = NULL;
2090 }
6e6f0923 2091 msg = create_request_message(mdsc, req, mds, drop_cap_releases);
2f2dc053 2092 if (IS_ERR(msg)) {
e1518c7c 2093 req->r_err = PTR_ERR(msg);
a79832f2 2094 return PTR_ERR(msg);
2f2dc053
SW		 2095 }
2096 req->r_request = msg;
2097
2098 rhead = msg->front.iov_base;
2f2dc053 2099 rhead->oldest_client_tid = cpu_to_le64(__get_oldest_tid(mdsc));
bc2de10d 2100 if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags))
2f2dc053 2101 flags |= CEPH_MDS_FLAG_REPLAY;
3dd69aab 2102 if (req->r_parent)
2f2dc053
SW		 2103 flags |= CEPH_MDS_FLAG_WANT_DENTRY;
2104 rhead->flags = cpu_to_le32(flags);
2105 rhead->num_fwd = req->r_num_fwd;
2106 rhead->num_retry = req->r_attempts - 1;
01a92f17 2107 rhead->ino = 0;
2f2dc053 2108
3dd69aab 2109 dout(" r_parent = %p\n", req->r_parent);
2f2dc053
SW		 2110 return 0;
2111}
2112
2113/*
2114 * send request, or put it on the appropriate wait list.
2115 */
2116static int __do_request(struct ceph_mds_client *mdsc,
2117 struct ceph_mds_request *req)
2118{
2119 struct ceph_mds_session *session = NULL;
2120 int mds = -1;
48fec5d0 2121 int err = 0;
2f2dc053 2122
bc2de10d
JL		 2123 if (req->r_err || test_bit(CEPH_MDS_R_GOT_RESULT, &req->r_req_flags)) {
2124 if (test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags))
eb1b8af3 2125 __unregister_request(mdsc, req);
2f2dc053 2126 goto out;
eb1b8af3 2127 }
2f2dc053
SW		 2128
2129 if (req->r_timeout &&
2130 time_after_eq(jiffies, req->r_started + req->r_timeout)) {
2131 dout("do_request timed out\n");
2132 err = -EIO;
2133 goto finish;
2134 }
52953d55 2135 if (READ_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_SHUTDOWN) {
48fec5d0
YZ		 2136 dout("do_request forced umount\n");
2137 err = -EIO;
2138 goto finish;
2139 }
52953d55 2140 if (READ_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_MOUNTING) {
e9e427f0
YZ		 2141 if (mdsc->mdsmap_err) {
2142 err = mdsc->mdsmap_err;
2143 dout("do_request mdsmap err %d\n", err);
2144 goto finish;
2145 }
cc8e8342
YZ		 2146 if (mdsc->mdsmap->m_epoch == 0) {
2147 dout("do_request no mdsmap, waiting for map\n");
2148 list_add(&req->r_wait, &mdsc->waiting_for_map);
2149 goto finish;
2150 }
e9e427f0
YZ		 2151 if (!(mdsc->fsc->mount_options->flags &
2152 CEPH_MOUNT_OPT_MOUNTWAIT) &&
2153 !ceph_mdsmap_is_cluster_available(mdsc->mdsmap)) {
2154 err = -ENOENT;
2155 pr_info("probably no mds server is up\n");
2156 goto finish;
2157 }
2158 }
2f2dc053 2159
dc69e2e9
SW		 2160 put_request_session(req);
2161
2f2dc053
SW		 2162 mds = __choose_mds(mdsc, req);
2163 if (mds < 0 ||
2164 ceph_mdsmap_get_state(mdsc->mdsmap, mds) < CEPH_MDS_STATE_ACTIVE) {
2165 dout("do_request no mds or not active, waiting for map\n");
2166 list_add(&req->r_wait, &mdsc->waiting_for_map);
2167 goto out;
2168 }
2169
2170 /* get, open session */
2171 session = __ceph_lookup_mds_session(mdsc, mds);
9c423956 2172 if (!session) {
2f2dc053 2173 session = register_session(mdsc, mds);
9c423956
SW		 2174 if (IS_ERR(session)) {
2175 err = PTR_ERR(session);
2176 goto finish;
2177 }
2178 }
dc69e2e9
SW		 2179 req->r_session = get_session(session);
2180
2f2dc053 2181 dout("do_request mds%d session %p state %s\n", mds, session,
a687ecaf 2182 ceph_session_state_name(session->s_state));
2f2dc053
SW		 2183 if (session->s_state != CEPH_MDS_SESSION_OPEN &&
2184 session->s_state != CEPH_MDS_SESSION_HUNG) {
fcff415c
YZ		 2185 if (session->s_state == CEPH_MDS_SESSION_REJECTED) {
2186 err = -EACCES;
2187 goto out_session;
2188 }
2f2dc053
SW		 2189 if (session->s_state == CEPH_MDS_SESSION_NEW ||
2190 session->s_state == CEPH_MDS_SESSION_CLOSING)
2191 __open_session(mdsc, session);
2192 list_add(&req->r_wait, &session->s_waiting);
2193 goto out_session;
2194 }
2195
2196 /* send request */
2f2dc053
SW		 2197 req->r_resend_mds = -1; /* forget any previous mds hint */
2198
2199 if (req->r_request_started == 0) /* note request start time */
2200 req->r_request_started = jiffies;
2201
6e6f0923 2202 err = __prepare_send_request(mdsc, req, mds, false);
2f2dc053
SW		 2203 if (!err) {
2204 ceph_msg_get(req->r_request);
2205 ceph_con_send(&session->s_con, req->r_request);
2206 }
2207
2208out_session:
2209 ceph_put_mds_session(session);
48fec5d0
YZ		 2210finish:
2211 if (err) {
2212 dout("__do_request early error %d\n", err);
2213 req->r_err = err;
2214 complete_request(mdsc, req);
2215 __unregister_request(mdsc, req);
2216 }
2f2dc053
SW		 2217out:
2218 return err;
2f2dc053
SW		 2219}
2220
2221/*
2222 * called under mdsc->mutex
2223 */
2224static void __wake_requests(struct ceph_mds_client *mdsc,
2225 struct list_head *head)
2226{
ed75ec2c
YZ		 2227 struct ceph_mds_request *req;
2228 LIST_HEAD(tmp_list);
2229
2230 list_splice_init(head, &tmp_list);
2f2dc053 2231
ed75ec2c
YZ		 2232 while (!list_empty(&tmp_list)) {
2233 req = list_entry(tmp_list.next,
2234 struct ceph_mds_request, r_wait);
2f2dc053 2235 list_del_init(&req->r_wait);
7971bd92 2236 dout(" wake request %p tid %llu\n", req, req->r_tid);
2f2dc053
SW		 2237 __do_request(mdsc, req);
2238 }
2239}
2240
2241/*
2242 * Wake up threads with requests pending for @mds, so that they can
29790f26 2243 * resubmit their requests to a possibly different mds.
2f2dc053 2244 */
29790f26 2245static void kick_requests(struct ceph_mds_client *mdsc, int mds)
2f2dc053 2246{
44ca18f2 2247 struct ceph_mds_request *req;
282c1052 2248 struct rb_node *p = rb_first(&mdsc->request_tree);
2f2dc053
SW		 2249
2250 dout("kick_requests mds%d\n", mds);
282c1052 2251 while (p) {
44ca18f2 2252 req = rb_entry(p, struct ceph_mds_request, r_node);
282c1052 2253 p = rb_next(p);
bc2de10d 2254 if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags))
44ca18f2 2255 continue;
3de22be6
YZ		 2256 if (req->r_attempts > 0)
2257 continue; /* only new requests */
44ca18f2
SW		 2258 if (req->r_session &&
2259 req->r_session->s_mds == mds) {
2260 dout(" kicking tid %llu\n", req->r_tid);
03974e81 2261 list_del_init(&req->r_wait);
44ca18f2 2262 __do_request(mdsc, req);
2f2dc053
SW		 2263 }
2264 }
2265}
2266
2267void ceph_mdsc_submit_request(struct ceph_mds_client *mdsc,
2268 struct ceph_mds_request *req)
2269{
2270 dout("submit_request on %p\n", req);
2271 mutex_lock(&mdsc->mutex);
2272 __register_request(mdsc, req, NULL);
2273 __do_request(mdsc, req);
2274 mutex_unlock(&mdsc->mutex);
2275}
2276
2277/*
2278 * Synchrously perform an mds request. Take care of all of the
2279 * session setup, forwarding, retry details.
2280 */
2281int ceph_mdsc_do_request(struct ceph_mds_client *mdsc,
2282 struct inode *dir,
2283 struct ceph_mds_request *req)
2284{
2285 int err;
2286
2287 dout("do_request on %p\n", req);
2288
3dd69aab 2289 /* take CAP_PIN refs for r_inode, r_parent, r_old_dentry */
2f2dc053
SW		 2290 if (req->r_inode)
2291 ceph_get_cap_refs(ceph_inode(req->r_inode), CEPH_CAP_PIN);
3dd69aab
JL		 2292 if (req->r_parent)
2293 ceph_get_cap_refs(ceph_inode(req->r_parent), CEPH_CAP_PIN);
844d87c3 2294 if (req->r_old_dentry_dir)
41b02e1f
SW		 2295 ceph_get_cap_refs(ceph_inode(req->r_old_dentry_dir),
2296 CEPH_CAP_PIN);
2f2dc053
SW		 2297
2298 /* issue */
2299 mutex_lock(&mdsc->mutex);
2300 __register_request(mdsc, req, dir);
2301 __do_request(mdsc, req);
2302
e1518c7c
SW		 2303 if (req->r_err) {
2304 err = req->r_err;
e1518c7c 2305 goto out;
2f2dc053
SW		 2306 }
2307
e1518c7c
SW		 2308 /* wait */
2309 mutex_unlock(&mdsc->mutex);
2310 dout("do_request waiting\n");
5be73034 2311 if (!req->r_timeout && req->r_wait_for_completion) {
9280be24 2312 err = req->r_wait_for_completion(mdsc, req);
e1518c7c 2313 } else {
5be73034
ID		 2314 long timeleft = wait_for_completion_killable_timeout(
2315 &req->r_completion,
2316 ceph_timeout_jiffies(req->r_timeout));
2317 if (timeleft > 0)
2318 err = 0;
2319 else if (!timeleft)
2320 err = -EIO; /* timed out */
2321 else
2322 err = timeleft; /* killed */
e1518c7c
SW		 2323 }
2324 dout("do_request waited, got %d\n", err);
2325 mutex_lock(&mdsc->mutex);
5b1daecd 2326
e1518c7c 2327 /* only abort if we didn't race with a real reply */
bc2de10d 2328 if (test_bit(CEPH_MDS_R_GOT_RESULT, &req->r_req_flags)) {
e1518c7c
SW		 2329 err = le32_to_cpu(req->r_reply_info.head->result);
2330 } else if (err < 0) {
2331 dout("aborted request %lld with %d\n", req->r_tid, err);
b4556396
SW		 2332
2333 /*
2334 * ensure we aren't running concurrently with
2335 * ceph_fill_trace or ceph_readdir_prepopulate, which
2336 * rely on locks (dir mutex) held by our caller.
2337 */
2338 mutex_lock(&req->r_fill_mutex);
e1518c7c 2339 req->r_err = err;
bc2de10d 2340 set_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags);
b4556396 2341 mutex_unlock(&req->r_fill_mutex);
5b1daecd 2342
3dd69aab 2343 if (req->r_parent &&
167c9e35
SW		 2344 (req->r_op & CEPH_MDS_OP_WRITE))
2345 ceph_invalidate_dir_request(req);
2f2dc053 2346 } else {
e1518c7c 2347 err = req->r_err;
2f2dc053 2348 }
2f2dc053 2349
e1518c7c
SW		 2350out:
2351 mutex_unlock(&mdsc->mutex);
2f2dc053
SW		 2352 dout("do_request %p done, result %d\n", req, err);
2353 return err;
2354}
2355
167c9e35 2356/*
2f276c51 2357 * Invalidate dir's completeness, dentry lease state on an aborted MDS
167c9e35
SW		 2358 * namespace request.
2359 */
2360void ceph_invalidate_dir_request(struct ceph_mds_request *req)
2361{
3dd69aab 2362 struct inode *inode = req->r_parent;
167c9e35 2363
2f276c51 2364 dout("invalidate_dir_request %p (complete, lease(s))\n", inode);
167c9e35 2365
2f276c51 2366 ceph_dir_clear_complete(inode);
167c9e35
SW		 2367 if (req->r_dentry)
2368 ceph_invalidate_dentry_lease(req->r_dentry);
2369 if (req->r_old_dentry)
2370 ceph_invalidate_dentry_lease(req->r_old_dentry);
2371}
2372
2f2dc053
SW		 2373/*
2374 * Handle mds reply.
2375 *
2376 * We take the session mutex and parse and process the reply immediately.
2377 * This preserves the logical ordering of replies, capabilities, etc., sent
2378 * by the MDS as they are applied to our local cache.
2379 */
2380static void handle_reply(struct ceph_mds_session *session, struct ceph_msg *msg)
2381{
2382 struct ceph_mds_client *mdsc = session->s_mdsc;
2383 struct ceph_mds_request *req;
2384 struct ceph_mds_reply_head *head = msg->front.iov_base;
2385 struct ceph_mds_reply_info_parsed *rinfo; /* parsed reply info */
982d6011 2386 struct ceph_snap_realm *realm;
2f2dc053
SW		 2387 u64 tid;
2388 int err, result;
2600d2dd 2389 int mds = session->s_mds;
2f2dc053 2390
2f2dc053
SW		 2391 if (msg->front.iov_len < sizeof(*head)) {
2392 pr_err("mdsc_handle_reply got corrupt (short) reply\n");
9ec7cab1 2393 ceph_msg_dump(msg);
2f2dc053
SW		 2394 return;
2395 }
2396
2397 /* get request, session */
6df058c0 2398 tid = le64_to_cpu(msg->hdr.tid);
2f2dc053 2399 mutex_lock(&mdsc->mutex);
fcd00b68 2400 req = lookup_get_request(mdsc, tid);
2f2dc053
SW		 2401 if (!req) {
2402 dout("handle_reply on unknown tid %llu\n", tid);
2403 mutex_unlock(&mdsc->mutex);
2404 return;
2405 }
2406 dout("handle_reply %p\n", req);
2f2dc053
SW		 2407
2408 /* correct session? */
d96d6049 2409 if (req->r_session != session) {
2f2dc053
SW		 2410 pr_err("mdsc_handle_reply got %llu on session mds%d"
2411 " not mds%d\n", tid, session->s_mds,
2412 req->r_session ? req->r_session->s_mds : -1);
2413 mutex_unlock(&mdsc->mutex);
2414 goto out;
2415 }
2416
2417 /* dup? */
bc2de10d
JL		 2418 if ((test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags) && !head->safe) ||
2419 (test_bit(CEPH_MDS_R_GOT_SAFE, &req->r_req_flags) && head->safe)) {
f3ae1b97 2420 pr_warn("got a dup %s reply on %llu from mds%d\n",
2f2dc053
SW		 2421 head->safe ? "safe" : "unsafe", tid, mds);
2422 mutex_unlock(&mdsc->mutex);
2423 goto out;
2424 }
bc2de10d 2425 if (test_bit(CEPH_MDS_R_GOT_SAFE, &req->r_req_flags)) {
f3ae1b97 2426 pr_warn("got unsafe after safe on %llu from mds%d\n",
85792d0d
SW		 2427 tid, mds);
2428 mutex_unlock(&mdsc->mutex);
2429 goto out;
2430 }
2f2dc053
SW		 2431
2432 result = le32_to_cpu(head->result);
2433
2434 /*
e55b71f8
GF		 2435 * Handle an ESTALE
2436 * if we're not talking to the authority, send to them
2437 * if the authority has changed while we weren't looking,
2438 * send to new authority
2439 * Otherwise we just have to return an ESTALE
2f2dc053
SW		 2440 */
2441 if (result == -ESTALE) {
e55b71f8 2442 dout("got ESTALE on request %llu", req->r_tid);
51da8e8c 2443 req->r_resend_mds = -1;
ca18bede 2444 if (req->r_direct_mode != USE_AUTH_MDS) {
e55b71f8
GF		 2445 dout("not using auth, setting for that now");
2446 req->r_direct_mode = USE_AUTH_MDS;
2f2dc053
SW		 2447 __do_request(mdsc, req);
2448 mutex_unlock(&mdsc->mutex);
2449 goto out;
e55b71f8 2450 } else {
ca18bede
YZ		 2451 int mds = __choose_mds(mdsc, req);
2452 if (mds >= 0 && mds != req->r_session->s_mds) {
2453 dout("but auth changed, so resending");
e55b71f8
GF		 2454 __do_request(mdsc, req);
2455 mutex_unlock(&mdsc->mutex);
2456 goto out;
2457 }
2f2dc053 2458 }
e55b71f8 2459 dout("have to return ESTALE on request %llu", req->r_tid);
2f2dc053
SW		 2460 }
2461
e55b71f8 2462
2f2dc053 2463 if (head->safe) {
bc2de10d 2464 set_bit(CEPH_MDS_R_GOT_SAFE, &req->r_req_flags);
2f2dc053 2465 __unregister_request(mdsc, req);
2f2dc053 2466
bc2de10d 2467 if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) {
2f2dc053
SW		 2468 /*
2469 * We already handled the unsafe response, now do the
2470 * cleanup. No need to examine the response; the MDS
2471 * doesn't include any result info in the safe
2472 * response. And even if it did, there is nothing
2473 * useful we could do with a revised return value.
2474 */
2475 dout("got safe reply %llu, mds%d\n", tid, mds);
2f2dc053
SW		 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 {
bc2de10d 2484 set_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags);
2f2dc053 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;
f5a03b08 2524 err = ceph_fill_trace(mdsc->fsc->sb, req);
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 2537
bc2de10d
JL		 2538 if (err == 0 && req->r_target_inode &&
2539 test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) {
68cd5b4b
YZ		 2540 struct ceph_inode_info *ci = ceph_inode(req->r_target_inode);
2541 spin_lock(&ci->i_unsafe_lock);
2542 list_add_tail(&req->r_unsafe_target_item, &ci->i_unsafe_iops);
2543 spin_unlock(&ci->i_unsafe_lock);
2544 }
2f2dc053 2545out_err:
e1518c7c 2546 mutex_lock(&mdsc->mutex);
bc2de10d 2547 if (!test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags)) {
e1518c7c
SW		 2548 if (err) {
2549 req->r_err = err;
2550 } else {
5fdb1389 2551 req->r_reply = ceph_msg_get(msg);
bc2de10d 2552 set_bit(CEPH_MDS_R_GOT_RESULT, &req->r_req_flags);
e1518c7c 2553 }
2f2dc053 2554 } else {
e1518c7c 2555 dout("reply arrived after request %lld was aborted\n", tid);
2f2dc053 2556 }
e1518c7c 2557 mutex_unlock(&mdsc->mutex);
2f2dc053 2558
2f2dc053
SW		 2559 mutex_unlock(&session->s_mutex);
2560
2561 /* kick calling process */
2562 complete_request(mdsc, req);
2563out:
2564 ceph_mdsc_put_request(req);
2565 return;
2566}
2567
2568
2569
2570/*
2571 * handle mds notification that our request has been forwarded.
2572 */
2600d2dd
SW		 2573static void handle_forward(struct ceph_mds_client *mdsc,
2574 struct ceph_mds_session *session,
2575 struct ceph_msg *msg)
2f2dc053
SW		 2576{
2577 struct ceph_mds_request *req;
a1ea787c 2578 u64 tid = le64_to_cpu(msg->hdr.tid);
2f2dc053
SW		 2579 u32 next_mds;
2580 u32 fwd_seq;
2f2dc053
SW		 2581 int err = -EINVAL;
2582 void *p = msg->front.iov_base;
2583 void *end = p + msg->front.iov_len;
2f2dc053 2584
a1ea787c 2585 ceph_decode_need(&p, end, 2*sizeof(u32), bad);
c89136ea
SW		 2586 next_mds = ceph_decode_32(&p);
2587 fwd_seq = ceph_decode_32(&p);
2f2dc053
SW		 2588
2589 mutex_lock(&mdsc->mutex);
fcd00b68 2590 req = lookup_get_request(mdsc, tid);
2f2dc053 2591 if (!req) {
2a8e5e36 2592 dout("forward tid %llu to mds%d - req dne\n", tid, next_mds);
2f2dc053
SW		 2593 goto out; /* dup reply? */
2594 }
2595
bc2de10d 2596 if (test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags)) {
2a8e5e36
SW		 2597 dout("forward tid %llu aborted, unregistering\n", tid);
2598 __unregister_request(mdsc, req);
2599 } else if (fwd_seq <= req->r_num_fwd) {
2600 dout("forward tid %llu to mds%d - old seq %d <= %d\n",
2f2dc053
SW		 2601 tid, next_mds, req->r_num_fwd, fwd_seq);
2602 } else {
2603 /* resend. forward race not possible; mds would drop */
2a8e5e36
SW		 2604 dout("forward tid %llu to mds%d (we resend)\n", tid, next_mds);
2605 BUG_ON(req->r_err);
bc2de10d 2606 BUG_ON(test_bit(CEPH_MDS_R_GOT_RESULT, &req->r_req_flags));
3de22be6 2607 req->r_attempts = 0;
2f2dc053
SW		 2608 req->r_num_fwd = fwd_seq;
2609 req->r_resend_mds = next_mds;
2610 put_request_session(req);
2611 __do_request(mdsc, req);
2612 }
2613 ceph_mdsc_put_request(req);
2614out:
2615 mutex_unlock(&mdsc->mutex);
2616 return;
2617
2618bad:
2619 pr_err("mdsc_handle_forward decode error err=%d\n", err);
2620}
2621
2622/*
2623 * handle a mds session control message
2624 */
2625static void handle_session(struct ceph_mds_session *session,
2626 struct ceph_msg *msg)
2627{
2628 struct ceph_mds_client *mdsc = session->s_mdsc;
2629 u32 op;
2630 u64 seq;
2600d2dd 2631 int mds = session->s_mds;
2f2dc053
SW		 2632 struct ceph_mds_session_head *h = msg->front.iov_base;
2633 int wake = 0;
2634
2f2dc053
SW		 2635 /* decode */
2636 if (msg->front.iov_len != sizeof(*h))
2637 goto bad;
2638 op = le32_to_cpu(h->op);
2639 seq = le64_to_cpu(h->seq);
2640
2641 mutex_lock(&mdsc->mutex);
0a07fc8c
YZ		 2642 if (op == CEPH_SESSION_CLOSE) {
2643 get_session(session);
2600d2dd 2644 __unregister_session(mdsc, session);
0a07fc8c 2645 }
2f2dc053
SW		 2646 /* FIXME: this ttl calculation is generous */
2647 session->s_ttl = jiffies + HZ*mdsc->mdsmap->m_session_autoclose;
2648 mutex_unlock(&mdsc->mutex);
2649
2650 mutex_lock(&session->s_mutex);
2651
2652 dout("handle_session mds%d %s %p state %s seq %llu\n",
2653 mds, ceph_session_op_name(op), session,
a687ecaf 2654 ceph_session_state_name(session->s_state), seq);
2f2dc053
SW		 2655
2656 if (session->s_state == CEPH_MDS_SESSION_HUNG) {
2657 session->s_state = CEPH_MDS_SESSION_OPEN;
2658 pr_info("mds%d came back\n", session->s_mds);
2659 }
2660
2661 switch (op) {
2662 case CEPH_SESSION_OPEN:
29790f26
SW		 2663 if (session->s_state == CEPH_MDS_SESSION_RECONNECTING)
2664 pr_info("mds%d reconnect success\n", session->s_mds);
2f2dc053
SW		 2665 session->s_state = CEPH_MDS_SESSION_OPEN;
2666 renewed_caps(mdsc, session, 0);
2667 wake = 1;
2668 if (mdsc->stopping)
2669 __close_session(mdsc, session);
2670 break;
2671
2672 case CEPH_SESSION_RENEWCAPS:
2673 if (session->s_renew_seq == seq)
2674 renewed_caps(mdsc, session, 1);
2675 break;
2676
2677 case CEPH_SESSION_CLOSE:
29790f26
SW		 2678 if (session->s_state == CEPH_MDS_SESSION_RECONNECTING)
2679 pr_info("mds%d reconnect denied\n", session->s_mds);
1c841a96 2680 cleanup_session_requests(mdsc, session);
2f2dc053 2681 remove_session_caps(session);
656e4382 2682 wake = 2; /* for good measure */
f3c60c59 2683 wake_up_all(&mdsc->session_close_wq);
2f2dc053
SW		 2684 break;
2685
2686 case CEPH_SESSION_STALE:
2687 pr_info("mds%d caps went stale, renewing\n",
2688 session->s_mds);
d8fb02ab 2689 spin_lock(&session->s_gen_ttl_lock);
2f2dc053 2690 session->s_cap_gen++;
1ce208a6 2691 session->s_cap_ttl = jiffies - 1;
d8fb02ab 2692 spin_unlock(&session->s_gen_ttl_lock);
2f2dc053
SW		 2693 send_renew_caps(mdsc, session);
2694 break;
2695
2696 case CEPH_SESSION_RECALL_STATE:
2697 trim_caps(mdsc, session, le32_to_cpu(h->max_caps));
2698 break;
2699
186e4f7a
YZ		 2700 case CEPH_SESSION_FLUSHMSG:
2701 send_flushmsg_ack(mdsc, session, seq);
2702 break;
2703
03f4fcb0
YZ		 2704 case CEPH_SESSION_FORCE_RO:
2705 dout("force_session_readonly %p\n", session);
2706 spin_lock(&session->s_cap_lock);
2707 session->s_readonly = true;
2708 spin_unlock(&session->s_cap_lock);
2709 wake_up_session_caps(session, 0);
2710 break;
2711
fcff415c
YZ		 2712 case CEPH_SESSION_REJECT:
2713 WARN_ON(session->s_state != CEPH_MDS_SESSION_OPENING);
2714 pr_info("mds%d rejected session\n", session->s_mds);
2715 session->s_state = CEPH_MDS_SESSION_REJECTED;
2716 cleanup_session_requests(mdsc, session);
2717 remove_session_caps(session);
2718 wake = 2; /* for good measure */
2719 break;
2720
2f2dc053
SW		 2721 default:
2722 pr_err("mdsc_handle_session bad op %d mds%d\n", op, mds);
2723 WARN_ON(1);
2724 }
2725
2726 mutex_unlock(&session->s_mutex);
2727 if (wake) {
2728 mutex_lock(&mdsc->mutex);
2729 __wake_requests(mdsc, &session->s_waiting);
656e4382
YZ		 2730 if (wake == 2)
2731 kick_requests(mdsc, mds);
2f2dc053
SW		 2732 mutex_unlock(&mdsc->mutex);
2733 }
0a07fc8c
YZ		 2734 if (op == CEPH_SESSION_CLOSE)
2735 ceph_put_mds_session(session);
2f2dc053
SW		 2736 return;
2737
2738bad:
2739 pr_err("mdsc_handle_session corrupt message mds%d len %d\n", mds,
2740 (int)msg->front.iov_len);
9ec7cab1 2741 ceph_msg_dump(msg);
2f2dc053
SW		 2742 return;
2743}
2744
2745
2746/*
2747 * called under session->mutex.
2748 */
2749static void replay_unsafe_requests(struct ceph_mds_client *mdsc,
2750 struct ceph_mds_session *session)
2751{
2752 struct ceph_mds_request *req, *nreq;
3de22be6 2753 struct rb_node *p;
2f2dc053
SW		 2754 int err;
2755
2756 dout("replay_unsafe_requests mds%d\n", session->s_mds);
2757
2758 mutex_lock(&mdsc->mutex);
2759 list_for_each_entry_safe(req, nreq, &session->s_unsafe, r_unsafe_item) {
6e6f0923 2760 err = __prepare_send_request(mdsc, req, session->s_mds, true);
2f2dc053
SW		 2761 if (!err) {
2762 ceph_msg_get(req->r_request);
2763 ceph_con_send(&session->s_con, req->r_request);
2764 }
2765 }
3de22be6
YZ		 2766
2767 /*
2768 * also re-send old requests when MDS enters reconnect stage. So that MDS
2769 * can process completed request in clientreplay stage.
2770 */
2771 p = rb_first(&mdsc->request_tree);
2772 while (p) {
2773 req = rb_entry(p, struct ceph_mds_request, r_node);
2774 p = rb_next(p);
bc2de10d 2775 if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags))
3de22be6
YZ		 2776 continue;
2777 if (req->r_attempts == 0)
2778 continue; /* only old requests */
2779 if (req->r_session &&
2780 req->r_session->s_mds == session->s_mds) {
6e6f0923
YZ		 2781 err = __prepare_send_request(mdsc, req,
2782 session->s_mds, true);
3de22be6
YZ		 2783 if (!err) {
2784 ceph_msg_get(req->r_request);
2785 ceph_con_send(&session->s_con, req->r_request);
2786 }
2787 }
2788 }
2f2dc053
SW		 2789 mutex_unlock(&mdsc->mutex);
2790}
2791
2792/*
2793 * Encode information about a cap for a reconnect with the MDS.
2794 */
2f2dc053
SW		 2795static int encode_caps_cb(struct inode *inode, struct ceph_cap *cap,
2796 void *arg)
2797{
20cb34ae
SW		 2798 union {
2799 struct ceph_mds_cap_reconnect v2;
2800 struct ceph_mds_cap_reconnect_v1 v1;
2801 } rec;
2f2dc053 2802 struct ceph_inode_info *ci;
20cb34ae
SW		 2803 struct ceph_reconnect_state *recon_state = arg;
2804 struct ceph_pagelist *pagelist = recon_state->pagelist;
2f2dc053
SW		 2805 char *path;
2806 int pathlen, err;
2807 u64 pathbase;
3469ed0d 2808 u64 snap_follows;
2f2dc053
SW		 2809 struct dentry *dentry;
2810
2811 ci = cap->ci;
2812
2813 dout(" adding %p ino %llx.%llx cap %p %lld %s\n",
2814 inode, ceph_vinop(inode), cap, cap->cap_id,
2815 ceph_cap_string(cap->issued));
93cea5be
SW		 2816 err = ceph_pagelist_encode_64(pagelist, ceph_ino(inode));
2817 if (err)
2818 return err;
2f2dc053
SW		 2819
2820 dentry = d_find_alias(inode);
2821 if (dentry) {
2822 path = ceph_mdsc_build_path(dentry, &pathlen, &pathbase, 0);
2823 if (IS_ERR(path)) {
2824 err = PTR_ERR(path);
e072f8aa 2825 goto out_dput;
2f2dc053
SW		 2826 }
2827 } else {
2828 path = NULL;
2829 pathlen = 0;
4eacd4cb 2830 pathbase = 0;
2f2dc053 2831 }
2f2dc053 2832
be655596 2833 spin_lock(&ci->i_ceph_lock);
2f2dc053
SW		 2834 cap->seq = 0; /* reset cap seq */
2835 cap->issue_seq = 0; /* and issue_seq */
667ca05c 2836 cap->mseq = 0; /* and migrate_seq */
99a9c273 2837 cap->cap_gen = cap->session->s_cap_gen;
20cb34ae 2838
121f22a1 2839 if (recon_state->msg_version >= 2) {
20cb34ae
SW		 2840 rec.v2.cap_id = cpu_to_le64(cap->cap_id);
2841 rec.v2.wanted = cpu_to_le32(__ceph_caps_wanted(ci));
2842 rec.v2.issued = cpu_to_le32(cap->issued);
2843 rec.v2.snaprealm = cpu_to_le64(ci->i_snap_realm->ino);
2844 rec.v2.pathbase = cpu_to_le64(pathbase);
2845 rec.v2.flock_len = 0;
20cb34ae
SW		 2846 } else {
2847 rec.v1.cap_id = cpu_to_le64(cap->cap_id);
2848 rec.v1.wanted = cpu_to_le32(__ceph_caps_wanted(ci));
2849 rec.v1.issued = cpu_to_le32(cap->issued);
2850 rec.v1.size = cpu_to_le64(inode->i_size);
2851 ceph_encode_timespec(&rec.v1.mtime, &inode->i_mtime);
2852 ceph_encode_timespec(&rec.v1.atime, &inode->i_atime);
2853 rec.v1.snaprealm = cpu_to_le64(ci->i_snap_realm->ino);
2854 rec.v1.pathbase = cpu_to_le64(pathbase);
20cb34ae 2855 }
3469ed0d
YZ		 2856
2857 if (list_empty(&ci->i_cap_snaps)) {
2858 snap_follows = 0;
2859 } else {
2860 struct ceph_cap_snap *capsnap =
2861 list_first_entry(&ci->i_cap_snaps,
2862 struct ceph_cap_snap, ci_item);
2863 snap_follows = capsnap->follows;
20cb34ae 2864 }
be655596 2865 spin_unlock(&ci->i_ceph_lock);
2f2dc053 2866
121f22a1 2867 if (recon_state->msg_version >= 2) {
40819f6f 2868 int num_fcntl_locks, num_flock_locks;
39be95e9 2869 struct ceph_filelock *flocks;
121f22a1
YZ		 2870 size_t struct_len, total_len = 0;
2871 u8 struct_v = 0;
39be95e9
JS		 2872
2873encode_again:
39be95e9 2874 ceph_count_locks(inode, &num_fcntl_locks, &num_flock_locks);
39be95e9
JS		 2875 flocks = kmalloc((num_fcntl_locks+num_flock_locks) *
2876 sizeof(struct ceph_filelock), GFP_NOFS);
2877 if (!flocks) {
2878 err = -ENOMEM;
2879 goto out_free;
2880 }
39be95e9
JS		 2881 err = ceph_encode_locks_to_buffer(inode, flocks,
2882 num_fcntl_locks,
2883 num_flock_locks);
39be95e9
JS		 2884 if (err) {
2885 kfree(flocks);
2886 if (err == -ENOSPC)
2887 goto encode_again;
2888 goto out_free;
2889 }
121f22a1
YZ		 2890
2891 if (recon_state->msg_version >= 3) {
2892 /* version, compat_version and struct_len */
2893 total_len = 2 * sizeof(u8) + sizeof(u32);
3469ed0d 2894 struct_v = 2;
121f22a1 2895 }
39be95e9
JS		 2896 /*
2897 * number of encoded locks is stable, so copy to pagelist
2898 */
121f22a1
YZ		 2899 struct_len = 2 * sizeof(u32) +
2900 (num_fcntl_locks + num_flock_locks) *
2901 sizeof(struct ceph_filelock);
2902 rec.v2.flock_len = cpu_to_le32(struct_len);
2903
2904 struct_len += sizeof(rec.v2);
2905 struct_len += sizeof(u32) + pathlen;
2906
3469ed0d
YZ		 2907 if (struct_v >= 2)
2908 struct_len += sizeof(u64); /* snap_follows */
2909
121f22a1
YZ		 2910 total_len += struct_len;
2911 err = ceph_pagelist_reserve(pagelist, total_len);
2912
2913 if (!err) {
2914 if (recon_state->msg_version >= 3) {
2915 ceph_pagelist_encode_8(pagelist, struct_v);
2916 ceph_pagelist_encode_8(pagelist, 1);
2917 ceph_pagelist_encode_32(pagelist, struct_len);
2918 }
2919 ceph_pagelist_encode_string(pagelist, path, pathlen);
2920 ceph_pagelist_append(pagelist, &rec, sizeof(rec.v2));
2921 ceph_locks_to_pagelist(flocks, pagelist,
2922 num_fcntl_locks,
2923 num_flock_locks);
3469ed0d
YZ		 2924 if (struct_v >= 2)
2925 ceph_pagelist_encode_64(pagelist, snap_follows);
121f22a1 2926 }
39be95e9 2927 kfree(flocks);
3612abbd 2928 } else {
121f22a1
YZ		 2929 size_t size = sizeof(u32) + pathlen + sizeof(rec.v1);
2930 err = ceph_pagelist_reserve(pagelist, size);
2931 if (!err) {
2932 ceph_pagelist_encode_string(pagelist, path, pathlen);
2933 ceph_pagelist_append(pagelist, &rec, sizeof(rec.v1));
2934 }
40819f6f 2935 }
44c99757
YZ		 2936
2937 recon_state->nr_caps++;
e072f8aa 2938out_free:
2f2dc053 2939 kfree(path);
e072f8aa 2940out_dput:
2f2dc053 2941 dput(dentry);
93cea5be 2942 return err;
2f2dc053
SW		 2943}
2944
2945
2946/*
2947 * If an MDS fails and recovers, clients need to reconnect in order to
2948 * reestablish shared state. This includes all caps issued through
2949 * this session _and_ the snap_realm hierarchy. Because it's not
2950 * clear which snap realms the mds cares about, we send everything we
2951 * know about.. that ensures we'll then get any new info the
2952 * recovering MDS might have.
2953 *
2954 * This is a relatively heavyweight operation, but it's rare.
2955 *
2956 * called with mdsc->mutex held.
2957 */
34b6c855
SW		 2958static void send_mds_reconnect(struct ceph_mds_client *mdsc,
2959 struct ceph_mds_session *session)
2f2dc053 2960{
2f2dc053 2961 struct ceph_msg *reply;
a105f00c 2962 struct rb_node *p;
34b6c855 2963 int mds = session->s_mds;
9abf82b8 2964 int err = -ENOMEM;
44c99757 2965 int s_nr_caps;
93cea5be 2966 struct ceph_pagelist *pagelist;
20cb34ae 2967 struct ceph_reconnect_state recon_state;
2f2dc053 2968
34b6c855 2969 pr_info("mds%d reconnect start\n", mds);
2f2dc053 2970
93cea5be
SW		 2971 pagelist = kmalloc(sizeof(*pagelist), GFP_NOFS);
2972 if (!pagelist)
2973 goto fail_nopagelist;
2974 ceph_pagelist_init(pagelist);
2975
b61c2763 2976 reply = ceph_msg_new(CEPH_MSG_CLIENT_RECONNECT, 0, GFP_NOFS, false);
a79832f2 2977 if (!reply)
93cea5be 2978 goto fail_nomsg;
93cea5be 2979
34b6c855
SW		 2980 mutex_lock(&session->s_mutex);
2981 session->s_state = CEPH_MDS_SESSION_RECONNECTING;
2982 session->s_seq = 0;
2f2dc053 2983
2f2dc053 2984 dout("session %p state %s\n", session,
a687ecaf 2985 ceph_session_state_name(session->s_state));
2f2dc053 2986
99a9c273
YZ		 2987 spin_lock(&session->s_gen_ttl_lock);
2988 session->s_cap_gen++;
2989 spin_unlock(&session->s_gen_ttl_lock);
2990
2991 spin_lock(&session->s_cap_lock);
03f4fcb0
YZ		 2992 /* don't know if session is readonly */
2993 session->s_readonly = 0;
99a9c273
YZ		 2994 /*
2995 * notify __ceph_remove_cap() that we are composing cap reconnect.
2996 * If a cap get released before being added to the cap reconnect,
2997 * __ceph_remove_cap() should skip queuing cap release.
2998 */
2999 session->s_cap_reconnect = 1;
e01a5946 3000 /* drop old cap expires; we're about to reestablish that state */
745a8e3b 3001 cleanup_cap_releases(mdsc, session);
e01a5946 3002
5d23371f 3003 /* trim unused caps to reduce MDS's cache rejoin time */
c0bd50e2
YZ		 3004 if (mdsc->fsc->sb->s_root)
3005 shrink_dcache_parent(mdsc->fsc->sb->s_root);
5d23371f
YZ		 3006
3007 ceph_con_close(&session->s_con);
3008 ceph_con_open(&session->s_con,
3009 CEPH_ENTITY_TYPE_MDS, mds,
3010 ceph_mdsmap_get_addr(mdsc->mdsmap, mds));
3011
3012 /* replay unsafe requests */
3013 replay_unsafe_requests(mdsc, session);
3014
3015 down_read(&mdsc->snap_rwsem);
3016
2f2dc053 3017 /* traverse this session's caps */
44c99757
YZ		 3018 s_nr_caps = session->s_nr_caps;
3019 err = ceph_pagelist_encode_32(pagelist, s_nr_caps);
93cea5be
SW		 3020 if (err)
3021 goto fail;
20cb34ae 3022
44c99757 3023 recon_state.nr_caps = 0;
20cb34ae 3024 recon_state.pagelist = pagelist;
121f22a1
YZ		 3025 if (session->s_con.peer_features & CEPH_FEATURE_MDSENC)
3026 recon_state.msg_version = 3;
3027 else if (session->s_con.peer_features & CEPH_FEATURE_FLOCK)
3028 recon_state.msg_version = 2;
3029 else
3030 recon_state.msg_version = 1;
20cb34ae 3031 err = iterate_session_caps(session, encode_caps_cb, &recon_state);
2f2dc053 3032 if (err < 0)
9abf82b8 3033 goto fail;
2f2dc053 3034
99a9c273
YZ		 3035 spin_lock(&session->s_cap_lock);
3036 session->s_cap_reconnect = 0;
3037 spin_unlock(&session->s_cap_lock);
3038
2f2dc053
SW		 3039 /*
3040 * snaprealms. we provide mds with the ino, seq (version), and
3041 * parent for all of our realms. If the mds has any newer info,
3042 * it will tell us.
3043 */
a105f00c
SW		 3044 for (p = rb_first(&mdsc->snap_realms); p; p = rb_next(p)) {
3045 struct ceph_snap_realm *realm =
3046 rb_entry(p, struct ceph_snap_realm, node);
93cea5be 3047 struct ceph_mds_snaprealm_reconnect sr_rec;
2f2dc053
SW		 3048
3049 dout(" adding snap realm %llx seq %lld parent %llx\n",
3050 realm->ino, realm->seq, realm->parent_ino);
93cea5be
SW		 3051 sr_rec.ino = cpu_to_le64(realm->ino);
3052 sr_rec.seq = cpu_to_le64(realm->seq);
3053 sr_rec.parent = cpu_to_le64(realm->parent_ino);
3054 err = ceph_pagelist_append(pagelist, &sr_rec, sizeof(sr_rec));
3055 if (err)
3056 goto fail;
2f2dc053 3057 }
2f2dc053 3058
121f22a1 3059 reply->hdr.version = cpu_to_le16(recon_state.msg_version);
44c99757
YZ		 3060
3061 /* raced with cap release? */
3062 if (s_nr_caps != recon_state.nr_caps) {
3063 struct page *page = list_first_entry(&pagelist->head,
3064 struct page, lru);
3065 __le32 *addr = kmap_atomic(page);
3066 *addr = cpu_to_le32(recon_state.nr_caps);
3067 kunmap_atomic(addr);
ebf18f47 3068 }
44c99757
YZ		 3069
3070 reply->hdr.data_len = cpu_to_le32(pagelist->length);
3071 ceph_msg_data_add_pagelist(reply, pagelist);
e548e9b9
YZ		 3072
3073 ceph_early_kick_flushing_caps(mdsc, session);
3074
2f2dc053
SW		 3075 ceph_con_send(&session->s_con, reply);
3076
9abf82b8
SW		 3077 mutex_unlock(&session->s_mutex);
3078
3079 mutex_lock(&mdsc->mutex);
3080 __wake_requests(mdsc, &session->s_waiting);
3081 mutex_unlock(&mdsc->mutex);
3082
2f2dc053 3083 up_read(&mdsc->snap_rwsem);
2f2dc053
SW		 3084 return;
3085
93cea5be 3086fail:
2f2dc053 3087 ceph_msg_put(reply);
9abf82b8
SW		 3088 up_read(&mdsc->snap_rwsem);
3089 mutex_unlock(&session->s_mutex);
93cea5be
SW		 3090fail_nomsg:
3091 ceph_pagelist_release(pagelist);
93cea5be 3092fail_nopagelist:
9abf82b8 3093 pr_err("error %d preparing reconnect for mds%d\n", err, mds);
9abf82b8 3094 return;
2f2dc053
SW		 3095}
3096
3097
3098/*
3099 * compare old and new mdsmaps, kicking requests
3100 * and closing out old connections as necessary
3101 *
3102 * called under mdsc->mutex.
3103 */
3104static void check_new_map(struct ceph_mds_client *mdsc,
3105 struct ceph_mdsmap *newmap,
3106 struct ceph_mdsmap *oldmap)
3107{
3108 int i;
3109 int oldstate, newstate;
3110 struct ceph_mds_session *s;
3111
3112 dout("check_new_map new %u old %u\n",
3113 newmap->m_epoch, oldmap->m_epoch);
3114
76201b63 3115 for (i = 0; i < oldmap->m_num_mds && i < mdsc->max_sessions; i++) {
2f2dc053
SW		 3116 if (mdsc->sessions[i] == NULL)
3117 continue;
3118 s = mdsc->sessions[i];
3119 oldstate = ceph_mdsmap_get_state(oldmap, i);
3120 newstate = ceph_mdsmap_get_state(newmap, i);
3121
0deb01c9 3122 dout("check_new_map mds%d state %s%s -> %s%s (session %s)\n",
2f2dc053 3123 i, ceph_mds_state_name(oldstate),
0deb01c9 3124 ceph_mdsmap_is_laggy(oldmap, i) ? " (laggy)" : "",
2f2dc053 3125 ceph_mds_state_name(newstate),
0deb01c9 3126 ceph_mdsmap_is_laggy(newmap, i) ? " (laggy)" : "",
a687ecaf 3127 ceph_session_state_name(s->s_state));
2f2dc053 3128
76201b63 3129 if (i >= newmap->m_num_mds ||
3e8f43a0 3130 memcmp(ceph_mdsmap_get_addr(oldmap, i),
2f2dc053
SW		 3131 ceph_mdsmap_get_addr(newmap, i),
3132 sizeof(struct ceph_entity_addr))) {
3133 if (s->s_state == CEPH_MDS_SESSION_OPENING) {
3134 /* the session never opened, just close it
3135 * out now */
0a07fc8c 3136 get_session(s);
2600d2dd 3137 __unregister_session(mdsc, s);
0a07fc8c
YZ		 3138 __wake_requests(mdsc, &s->s_waiting);
3139 ceph_put_mds_session(s);
2827528d
YZ		 3140 } else if (i >= newmap->m_num_mds) {
3141 /* force close session for stopped mds */
3142 get_session(s);
3143 __unregister_session(mdsc, s);
3144 __wake_requests(mdsc, &s->s_waiting);
3145 kick_requests(mdsc, i);
3146 mutex_unlock(&mdsc->mutex);
3147
3148 mutex_lock(&s->s_mutex);
3149 cleanup_session_requests(mdsc, s);
3150 remove_session_caps(s);
3151 mutex_unlock(&s->s_mutex);
3152
3153 ceph_put_mds_session(s);
3154
3155 mutex_lock(&mdsc->mutex);
2f2dc053
SW		 3156 } else {
3157 /* just close it */
3158 mutex_unlock(&mdsc->mutex);
3159 mutex_lock(&s->s_mutex);
3160 mutex_lock(&mdsc->mutex);
3161 ceph_con_close(&s->s_con);
3162 mutex_unlock(&s->s_mutex);
3163 s->s_state = CEPH_MDS_SESSION_RESTARTING;
3164 }
2f2dc053
SW		 3165 } else if (oldstate == newstate) {
3166 continue; /* nothing new with this mds */
3167 }
3168
3169 /*
3170 * send reconnect?
3171 */
3172 if (s->s_state == CEPH_MDS_SESSION_RESTARTING &&
34b6c855
SW		 3173 newstate >= CEPH_MDS_STATE_RECONNECT) {
3174 mutex_unlock(&mdsc->mutex);
3175 send_mds_reconnect(mdsc, s);
3176 mutex_lock(&mdsc->mutex);
3177 }
2f2dc053
SW		 3178
3179 /*
29790f26 3180 * kick request on any mds that has gone active.
2f2dc053
SW		 3181 */
3182 if (oldstate < CEPH_MDS_STATE_ACTIVE &&
3183 newstate >= CEPH_MDS_STATE_ACTIVE) {
29790f26
SW		 3184 if (oldstate != CEPH_MDS_STATE_CREATING &&
3185 oldstate != CEPH_MDS_STATE_STARTING)
3186 pr_info("mds%d recovery completed\n", s->s_mds);
3187 kick_requests(mdsc, i);
2f2dc053 3188 ceph_kick_flushing_caps(mdsc, s);
0dc2570f 3189 wake_up_session_caps(s, 1);
2f2dc053
SW		 3190 }
3191 }
cb170a22 3192
76201b63 3193 for (i = 0; i < newmap->m_num_mds && i < mdsc->max_sessions; i++) {
cb170a22
SW		 3194 s = mdsc->sessions[i];
3195 if (!s)
3196 continue;
3197 if (!ceph_mdsmap_is_laggy(newmap, i))
3198 continue;
3199 if (s->s_state == CEPH_MDS_SESSION_OPEN ||
3200 s->s_state == CEPH_MDS_SESSION_HUNG ||
3201 s->s_state == CEPH_MDS_SESSION_CLOSING) {
3202 dout(" connecting to export targets of laggy mds%d\n",
3203 i);
3204 __open_export_target_sessions(mdsc, s);
3205 }
3206 }
2f2dc053
SW		 3207}
3208
3209
3210
3211/*
3212 * leases
3213 */
3214
3215/*
3216 * caller must hold session s_mutex, dentry->d_lock
3217 */
3218void __ceph_mdsc_drop_dentry_lease(struct dentry *dentry)
3219{
3220 struct ceph_dentry_info *di = ceph_dentry(dentry);
3221
3222 ceph_put_mds_session(di->lease_session);
3223 di->lease_session = NULL;
3224}
3225
2600d2dd
SW		 3226static void handle_lease(struct ceph_mds_client *mdsc,
3227 struct ceph_mds_session *session,
3228 struct ceph_msg *msg)
2f2dc053 3229{
3d14c5d2 3230 struct super_block *sb = mdsc->fsc->sb;
2f2dc053 3231 struct inode *inode;
2f2dc053
SW		 3232 struct dentry *parent, *dentry;
3233 struct ceph_dentry_info *di;
2600d2dd 3234 int mds = session->s_mds;
2f2dc053 3235 struct ceph_mds_lease *h = msg->front.iov_base;
1e5ea23d 3236 u32 seq;
2f2dc053 3237 struct ceph_vino vino;
2f2dc053
SW		 3238 struct qstr dname;
3239 int release = 0;
3240
2f2dc053
SW		 3241 dout("handle_lease from mds%d\n", mds);
3242
3243 /* decode */
3244 if (msg->front.iov_len < sizeof(*h) + sizeof(u32))
3245 goto bad;
3246 vino.ino = le64_to_cpu(h->ino);
3247 vino.snap = CEPH_NOSNAP;
1e5ea23d 3248 seq = le32_to_cpu(h->seq);
2f2dc053
SW		 3249 dname.name = (void *)h + sizeof(*h) + sizeof(u32);
3250 dname.len = msg->front.iov_len - sizeof(*h) - sizeof(u32);
3251 if (dname.len != get_unaligned_le32(h+1))
3252 goto bad;
3253
2f2dc053
SW		 3254 /* lookup inode */
3255 inode = ceph_find_inode(sb, vino);
2f90b852
SW		 3256 dout("handle_lease %s, ino %llx %p %.*s\n",
3257 ceph_lease_op_name(h->action), vino.ino, inode,
1e5ea23d 3258 dname.len, dname.name);
6cd3bcad
YZ		 3259
3260 mutex_lock(&session->s_mutex);
3261 session->s_seq++;
3262
2f2dc053
SW		 3263 if (inode == NULL) {
3264 dout("handle_lease no inode %llx\n", vino.ino);
3265 goto release;
3266 }
2f2dc053
SW		 3267
3268 /* dentry */
3269 parent = d_find_alias(inode);
3270 if (!parent) {
3271 dout("no parent dentry on inode %p\n", inode);
3272 WARN_ON(1);
3273 goto release; /* hrm... */
3274 }
8387ff25 3275 dname.hash = full_name_hash(parent, dname.name, dname.len);
2f2dc053
SW		 3276 dentry = d_lookup(parent, &dname);
3277 dput(parent);
3278 if (!dentry)
3279 goto release;
3280
3281 spin_lock(&dentry->d_lock);
3282 di = ceph_dentry(dentry);
3283 switch (h->action) {
3284 case CEPH_MDS_LEASE_REVOKE:
3d8eb7a9 3285 if (di->lease_session == session) {
1e5ea23d
SW		 3286 if (ceph_seq_cmp(di->lease_seq, seq) > 0)
3287 h->seq = cpu_to_le32(di->lease_seq);
2f2dc053
SW		 3288 __ceph_mdsc_drop_dentry_lease(dentry);
3289 }
3290 release = 1;
3291 break;
3292
3293 case CEPH_MDS_LEASE_RENEW:
3d8eb7a9 3294 if (di->lease_session == session &&
2f2dc053
SW		 3295 di->lease_gen == session->s_cap_gen &&
3296 di->lease_renew_from &&
3297 di->lease_renew_after == 0) {
3298 unsigned long duration =
3563dbdd 3299 msecs_to_jiffies(le32_to_cpu(h->duration_ms));
2f2dc053 3300
1e5ea23d 3301 di->lease_seq = seq;
9b16f03c 3302 di->time = di->lease_renew_from + duration;
2f2dc053
SW		 3303 di->lease_renew_after = di->lease_renew_from +
3304 (duration >> 1);
3305 di->lease_renew_from = 0;
3306 }
3307 break;
3308 }
3309 spin_unlock(&dentry->d_lock);
3310 dput(dentry);
3311
3312 if (!release)
3313 goto out;
3314
3315release:
3316 /* let's just reuse the same message */
3317 h->action = CEPH_MDS_LEASE_REVOKE_ACK;
3318 ceph_msg_get(msg);
3319 ceph_con_send(&session->s_con, msg);
3320
3321out:
3322 iput(inode);
3323 mutex_unlock(&session->s_mutex);
2f2dc053
SW		 3324 return;
3325
3326bad:
3327 pr_err("corrupt lease message\n");
9ec7cab1 3328 ceph_msg_dump(msg);
2f2dc053
SW		 3329}
3330
3331void ceph_mdsc_lease_send_msg(struct ceph_mds_session *session,
3332 struct inode *inode,
3333 struct dentry *dentry, char action,
3334 u32 seq)
3335{
3336 struct ceph_msg *msg;
3337 struct ceph_mds_lease *lease;
3338 int len = sizeof(*lease) + sizeof(u32);
3339 int dnamelen = 0;
3340
3341 dout("lease_send_msg inode %p dentry %p %s to mds%d\n",
3342 inode, dentry, ceph_lease_op_name(action), session->s_mds);
3343 dnamelen = dentry->d_name.len;
3344 len += dnamelen;
3345
b61c2763 3346 msg = ceph_msg_new(CEPH_MSG_CLIENT_LEASE, len, GFP_NOFS, false);
a79832f2 3347 if (!msg)
2f2dc053
SW		 3348 return;
3349 lease = msg->front.iov_base;
3350 lease->action = action;
2f2dc053
SW		 3351 lease->ino = cpu_to_le64(ceph_vino(inode).ino);
3352 lease->first = lease->last = cpu_to_le64(ceph_vino(inode).snap);
3353 lease->seq = cpu_to_le32(seq);
3354 put_unaligned_le32(dnamelen, lease + 1);
3355 memcpy((void *)(lease + 1) + 4, dentry->d_name.name, dnamelen);
3356
3357 /*
3358 * if this is a preemptive lease RELEASE, no need to
3359 * flush request stream, since the actual request will
3360 * soon follow.
3361 */
3362 msg->more_to_follow = (action == CEPH_MDS_LEASE_RELEASE);
3363
3364 ceph_con_send(&session->s_con, msg);
3365}
3366
2f2dc053
SW		 3367/*
3368 * drop all leases (and dentry refs) in preparation for umount
3369 */
3370static void drop_leases(struct ceph_mds_client *mdsc)
3371{
3372 int i;
3373
3374 dout("drop_leases\n");
3375 mutex_lock(&mdsc->mutex);
3376 for (i = 0; i < mdsc->max_sessions; i++) {
3377 struct ceph_mds_session *s = __ceph_lookup_mds_session(mdsc, i);
3378 if (!s)
3379 continue;
3380 mutex_unlock(&mdsc->mutex);
3381 mutex_lock(&s->s_mutex);
3382 mutex_unlock(&s->s_mutex);
3383 ceph_put_mds_session(s);
3384 mutex_lock(&mdsc->mutex);
3385 }
3386 mutex_unlock(&mdsc->mutex);
3387}
3388
3389
3390
3391/*
3392 * delayed work -- periodically trim expired leases, renew caps with mds
3393 */
3394static void schedule_delayed(struct ceph_mds_client *mdsc)
3395{
3396 int delay = 5;
3397 unsigned hz = round_jiffies_relative(HZ * delay);
3398 schedule_delayed_work(&mdsc->delayed_work, hz);
3399}
3400
3401static void delayed_work(struct work_struct *work)
3402{
3403 int i;
3404 struct ceph_mds_client *mdsc =
3405 container_of(work, struct ceph_mds_client, delayed_work.work);
3406 int renew_interval;
3407 int renew_caps;
3408
3409 dout("mdsc delayed_work\n");
afcdaea3 3410 ceph_check_delayed_caps(mdsc);
2f2dc053
SW		 3411
3412 mutex_lock(&mdsc->mutex);
3413 renew_interval = mdsc->mdsmap->m_session_timeout >> 2;
3414 renew_caps = time_after_eq(jiffies, HZ*renew_interval +
3415 mdsc->last_renew_caps);
3416 if (renew_caps)
3417 mdsc->last_renew_caps = jiffies;
3418
3419 for (i = 0; i < mdsc->max_sessions; i++) {
3420 struct ceph_mds_session *s = __ceph_lookup_mds_session(mdsc, i);
3421 if (s == NULL)
3422 continue;
3423 if (s->s_state == CEPH_MDS_SESSION_CLOSING) {
3424 dout("resending session close request for mds%d\n",
3425 s->s_mds);
3426 request_close_session(mdsc, s);
3427 ceph_put_mds_session(s);
3428 continue;
3429 }
3430 if (s->s_ttl && time_after(jiffies, s->s_ttl)) {
3431 if (s->s_state == CEPH_MDS_SESSION_OPEN) {
3432 s->s_state = CEPH_MDS_SESSION_HUNG;
3433 pr_info("mds%d hung\n", s->s_mds);
3434 }
3435 }
3436 if (s->s_state < CEPH_MDS_SESSION_OPEN) {
3437 /* this mds is failed or recovering, just wait */
3438 ceph_put_mds_session(s);
3439 continue;
3440 }
3441 mutex_unlock(&mdsc->mutex);
3442
3443 mutex_lock(&s->s_mutex);
3444 if (renew_caps)
3445 send_renew_caps(mdsc, s);
3446 else
3447 ceph_con_keepalive(&s->s_con);
aab53dd9
SW		 3448 if (s->s_state == CEPH_MDS_SESSION_OPEN ||
3449 s->s_state == CEPH_MDS_SESSION_HUNG)
3d7ded4d 3450 ceph_send_cap_releases(mdsc, s);
2f2dc053
SW		 3451 mutex_unlock(&s->s_mutex);
3452 ceph_put_mds_session(s);
3453
3454 mutex_lock(&mdsc->mutex);
3455 }
3456 mutex_unlock(&mdsc->mutex);
3457
3458 schedule_delayed(mdsc);
3459}
3460
3d14c5d2 3461int ceph_mdsc_init(struct ceph_fs_client *fsc)
2f2dc053 3462
2f2dc053 3463{
3d14c5d2
YS		 3464 struct ceph_mds_client *mdsc;
3465
3466 mdsc = kzalloc(sizeof(struct ceph_mds_client), GFP_NOFS);
3467 if (!mdsc)
3468 return -ENOMEM;
3469 mdsc->fsc = fsc;
3470 fsc->mdsc = mdsc;
2f2dc053
SW		 3471 mutex_init(&mdsc->mutex);
3472 mdsc->mdsmap = kzalloc(sizeof(*mdsc->mdsmap), GFP_NOFS);
fb3101b6 3473 if (mdsc->mdsmap == NULL) {
3474 kfree(mdsc);
2d06eeb8 3475 return -ENOMEM;
fb3101b6 3476 }
2d06eeb8 3477
2f2dc053 3478 init_completion(&mdsc->safe_umount_waiters);
f3c60c59 3479 init_waitqueue_head(&mdsc->session_close_wq);
2f2dc053
SW		 3480 INIT_LIST_HEAD(&mdsc->waiting_for_map);
3481 mdsc->sessions = NULL;
86d8f67b 3482 atomic_set(&mdsc->num_sessions, 0);
2f2dc053
SW		 3483 mdsc->max_sessions = 0;
3484 mdsc->stopping = 0;
affbc19a 3485 mdsc->last_snap_seq = 0;
2f2dc053 3486 init_rwsem(&mdsc->snap_rwsem);
a105f00c 3487 mdsc->snap_realms = RB_ROOT;
2f2dc053
SW		 3488 INIT_LIST_HEAD(&mdsc->snap_empty);
3489 spin_lock_init(&mdsc->snap_empty_lock);
3490 mdsc->last_tid = 0;
e8a7b8b1 3491 mdsc->oldest_tid = 0;
44ca18f2 3492 mdsc->request_tree = RB_ROOT;
2f2dc053
SW		 3493 INIT_DELAYED_WORK(&mdsc->delayed_work, delayed_work);
3494 mdsc->last_renew_caps = jiffies;
3495 INIT_LIST_HEAD(&mdsc->cap_delay_list);
3496 spin_lock_init(&mdsc->cap_delay_lock);
3497 INIT_LIST_HEAD(&mdsc->snap_flush_list);
3498 spin_lock_init(&mdsc->snap_flush_lock);
553adfd9 3499 mdsc->last_cap_flush_tid = 1;
e4500b5e 3500 INIT_LIST_HEAD(&mdsc->cap_flush_list);
2f2dc053 3501 INIT_LIST_HEAD(&mdsc->cap_dirty);
db354052 3502 INIT_LIST_HEAD(&mdsc->cap_dirty_migrating);
2f2dc053
SW		 3503 mdsc->num_cap_flushing = 0;
3504 spin_lock_init(&mdsc->cap_dirty_lock);
3505 init_waitqueue_head(&mdsc->cap_flushing_wq);
3506 spin_lock_init(&mdsc->dentry_lru_lock);
3507 INIT_LIST_HEAD(&mdsc->dentry_lru);
2d06eeb8 3508
37151668 3509 ceph_caps_init(mdsc);
3d14c5d2 3510 ceph_adjust_min_caps(mdsc, fsc->min_caps);
37151668 3511
10183a69
YZ		 3512 init_rwsem(&mdsc->pool_perm_rwsem);
3513 mdsc->pool_perm_tree = RB_ROOT;
3514
5f44f142 3515 return 0;
2f2dc053
SW		 3516}
3517
3518/*
3519 * Wait for safe replies on open mds requests. If we time out, drop
3520 * all requests from the tree to avoid dangling dentry refs.
3521 */
3522static void wait_requests(struct ceph_mds_client *mdsc)
3523{
a319bf56 3524 struct ceph_options *opts = mdsc->fsc->client->options;
2f2dc053 3525 struct ceph_mds_request *req;
2f2dc053
SW		 3526
3527 mutex_lock(&mdsc->mutex);
44ca18f2 3528 if (__get_oldest_req(mdsc)) {
2f2dc053 3529 mutex_unlock(&mdsc->mutex);
44ca18f2 3530
2f2dc053
SW		 3531 dout("wait_requests waiting for requests\n");
3532 wait_for_completion_timeout(&mdsc->safe_umount_waiters,
a319bf56 3533 ceph_timeout_jiffies(opts->mount_timeout));
2f2dc053
SW		 3534
3535 /* tear down remaining requests */
44ca18f2
SW		 3536 mutex_lock(&mdsc->mutex);
3537 while ((req = __get_oldest_req(mdsc))) {
2f2dc053
SW		 3538 dout("wait_requests timed out on tid %llu\n",
3539 req->r_tid);
44ca18f2 3540 __unregister_request(mdsc, req);
2f2dc053
SW		 3541 }
3542 }
3543 mutex_unlock(&mdsc->mutex);
3544 dout("wait_requests done\n");
3545}
3546
3547/*
3548 * called before mount is ro, and before dentries are torn down.
3549 * (hmm, does this still race with new lookups?)
3550 */
3551void ceph_mdsc_pre_umount(struct ceph_mds_client *mdsc)
3552{
3553 dout("pre_umount\n");
3554 mdsc->stopping = 1;
3555
3556 drop_leases(mdsc);
afcdaea3 3557 ceph_flush_dirty_caps(mdsc);
2f2dc053 3558 wait_requests(mdsc);
17c688c3
SW		 3559
3560 /*
3561 * wait for reply handlers to drop their request refs and
3562 * their inode/dcache refs
3563 */
3564 ceph_msgr_flush();
2f2dc053
SW		 3565}
3566
3567/*
3568 * wait for all write mds requests to flush.
3569 */
3570static void wait_unsafe_requests(struct ceph_mds_client *mdsc, u64 want_tid)
3571{
80fc7314 3572 struct ceph_mds_request *req = NULL, *nextreq;
44ca18f2 3573 struct rb_node *n;
2f2dc053
SW		 3574
3575 mutex_lock(&mdsc->mutex);
3576 dout("wait_unsafe_requests want %lld\n", want_tid);
80fc7314 3577restart:
44ca18f2
SW		 3578 req = __get_oldest_req(mdsc);
3579 while (req && req->r_tid <= want_tid) {
80fc7314
SW		 3580 /* find next request */
3581 n = rb_next(&req->r_node);
3582 if (n)
3583 nextreq = rb_entry(n, struct ceph_mds_request, r_node);
3584 else
3585 nextreq = NULL;
e8a7b8b1
YZ		 3586 if (req->r_op != CEPH_MDS_OP_SETFILELOCK &&
3587 (req->r_op & CEPH_MDS_OP_WRITE)) {
44ca18f2
SW		 3588 /* write op */
3589 ceph_mdsc_get_request(req);
80fc7314
SW		 3590 if (nextreq)
3591 ceph_mdsc_get_request(nextreq);
44ca18f2
SW		 3592 mutex_unlock(&mdsc->mutex);
3593 dout("wait_unsafe_requests wait on %llu (want %llu)\n",
3594 req->r_tid, want_tid);
3595 wait_for_completion(&req->r_safe_completion);
3596 mutex_lock(&mdsc->mutex);
44ca18f2 3597 ceph_mdsc_put_request(req);
80fc7314
SW		 3598 if (!nextreq)
3599 break; /* next dne before, so we're done! */
3600 if (RB_EMPTY_NODE(&nextreq->r_node)) {
3601 /* next request was removed from tree */
3602 ceph_mdsc_put_request(nextreq);
3603 goto restart;
3604 }
3605 ceph_mdsc_put_request(nextreq); /* won't go away */
44ca18f2 3606 }
80fc7314 3607 req = nextreq;
2f2dc053
SW		 3608 }
3609 mutex_unlock(&mdsc->mutex);
3610 dout("wait_unsafe_requests done\n");
3611}
3612
3613void ceph_mdsc_sync(struct ceph_mds_client *mdsc)
3614{
0e294387 3615 u64 want_tid, want_flush;
2f2dc053 3616
52953d55 3617 if (READ_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_SHUTDOWN)
56b7cf95
SW		 3618 return;
3619
2f2dc053
SW		 3620 dout("sync\n");
3621 mutex_lock(&mdsc->mutex);
3622 want_tid = mdsc->last_tid;
2f2dc053 3623 mutex_unlock(&mdsc->mutex);
2f2dc053 3624
afcdaea3 3625 ceph_flush_dirty_caps(mdsc);
d3383a8e 3626 spin_lock(&mdsc->cap_dirty_lock);
8310b089 3627 want_flush = mdsc->last_cap_flush_tid;
c8799fc4
YZ		 3628 if (!list_empty(&mdsc->cap_flush_list)) {
3629 struct ceph_cap_flush *cf =
3630 list_last_entry(&mdsc->cap_flush_list,
3631 struct ceph_cap_flush, g_list);
3632 cf->wake = true;
3633 }
d3383a8e
YZ		 3634 spin_unlock(&mdsc->cap_dirty_lock);
3635
0e294387
YZ		 3636 dout("sync want tid %lld flush_seq %lld\n",
3637 want_tid, want_flush);
2f2dc053
SW		 3638
3639 wait_unsafe_requests(mdsc, want_tid);
0e294387 3640 wait_caps_flush(mdsc, want_flush);
2f2dc053
SW		 3641}
3642
f3c60c59
SW		 3643/*
3644 * true if all sessions are closed, or we force unmount
3645 */
fcff415c 3646static bool done_closing_sessions(struct ceph_mds_client *mdsc, int skipped)
f3c60c59 3647{
52953d55 3648 if (READ_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_SHUTDOWN)
f3c60c59 3649 return true;
fcff415c 3650 return atomic_read(&mdsc->num_sessions) <= skipped;
f3c60c59 3651}
2f2dc053
SW		 3652
3653/*
3654 * called after sb is ro.
3655 */
3656void ceph_mdsc_close_sessions(struct ceph_mds_client *mdsc)
3657{
a319bf56 3658 struct ceph_options *opts = mdsc->fsc->client->options;
2f2dc053
SW		 3659 struct ceph_mds_session *session;
3660 int i;
fcff415c 3661 int skipped = 0;
2f2dc053
SW		 3662
3663 dout("close_sessions\n");
3664
2f2dc053 3665 /* close sessions */
f3c60c59
SW		 3666 mutex_lock(&mdsc->mutex);
3667 for (i = 0; i < mdsc->max_sessions; i++) {
3668 session = __ceph_lookup_mds_session(mdsc, i);
3669 if (!session)
3670 continue;
2f2dc053 3671 mutex_unlock(&mdsc->mutex);
f3c60c59 3672 mutex_lock(&session->s_mutex);
fcff415c
YZ		 3673 if (__close_session(mdsc, session) <= 0)
3674 skipped++;
f3c60c59
SW		 3675 mutex_unlock(&session->s_mutex);
3676 ceph_put_mds_session(session);
2f2dc053
SW		 3677 mutex_lock(&mdsc->mutex);
3678 }
f3c60c59
SW		 3679 mutex_unlock(&mdsc->mutex);
3680
3681 dout("waiting for sessions to close\n");
fcff415c
YZ		 3682 wait_event_timeout(mdsc->session_close_wq,
3683 done_closing_sessions(mdsc, skipped),
a319bf56 3684 ceph_timeout_jiffies(opts->mount_timeout));
2f2dc053
SW		 3685
3686 /* tear down remaining sessions */
f3c60c59 3687 mutex_lock(&mdsc->mutex);
2f2dc053
SW		 3688 for (i = 0; i < mdsc->max_sessions; i++) {
3689 if (mdsc->sessions[i]) {
3690 session = get_session(mdsc->sessions[i]);
2600d2dd 3691 __unregister_session(mdsc, session);
2f2dc053
SW		 3692 mutex_unlock(&mdsc->mutex);
3693 mutex_lock(&session->s_mutex);
3694 remove_session_caps(session);
3695 mutex_unlock(&session->s_mutex);
3696 ceph_put_mds_session(session);
3697 mutex_lock(&mdsc->mutex);
3698 }
3699 }
2f2dc053 3700 WARN_ON(!list_empty(&mdsc->cap_delay_list));
2f2dc053
SW		 3701 mutex_unlock(&mdsc->mutex);
3702
3703 ceph_cleanup_empty_realms(mdsc);
3704
3705 cancel_delayed_work_sync(&mdsc->delayed_work); /* cancel timer */
3706
3707 dout("stopped\n");
3708}
3709
48fec5d0
YZ		 3710void ceph_mdsc_force_umount(struct ceph_mds_client *mdsc)
3711{
3712 struct ceph_mds_session *session;
3713 int mds;
3714
3715 dout("force umount\n");
3716
3717 mutex_lock(&mdsc->mutex);
3718 for (mds = 0; mds < mdsc->max_sessions; mds++) {
3719 session = __ceph_lookup_mds_session(mdsc, mds);
3720 if (!session)
3721 continue;
3722 mutex_unlock(&mdsc->mutex);
3723 mutex_lock(&session->s_mutex);
3724 __close_session(mdsc, session);
3725 if (session->s_state == CEPH_MDS_SESSION_CLOSING) {
3726 cleanup_session_requests(mdsc, session);
3727 remove_session_caps(session);
3728 }
3729 mutex_unlock(&session->s_mutex);
3730 ceph_put_mds_session(session);
3731 mutex_lock(&mdsc->mutex);
3732 kick_requests(mdsc, mds);
3733 }
3734 __wake_requests(mdsc, &mdsc->waiting_for_map);
3735 mutex_unlock(&mdsc->mutex);
3736}
3737
3d14c5d2 3738static void ceph_mdsc_stop(struct ceph_mds_client *mdsc)
2f2dc053
SW		 3739{
3740 dout("stop\n");
3741 cancel_delayed_work_sync(&mdsc->delayed_work); /* cancel timer */
3742 if (mdsc->mdsmap)
3743 ceph_mdsmap_destroy(mdsc->mdsmap);
3744 kfree(mdsc->sessions);
37151668 3745 ceph_caps_finalize(mdsc);
10183a69 3746 ceph_pool_perm_destroy(mdsc);
2f2dc053
SW		 3747}
3748
3d14c5d2
YS		 3749void ceph_mdsc_destroy(struct ceph_fs_client *fsc)
3750{
3751 struct ceph_mds_client *mdsc = fsc->mdsc;
3752
ef550f6f 3753 dout("mdsc_destroy %p\n", mdsc);
3d14c5d2 3754 ceph_mdsc_stop(mdsc);
ef550f6f
SW		 3755
3756 /* flush out any connection work with references to us */
3757 ceph_msgr_flush();
3758
3d14c5d2
YS		 3759 fsc->mdsc = NULL;
3760 kfree(mdsc);
ef550f6f 3761 dout("mdsc_destroy %p done\n", mdsc);
3d14c5d2
YS		 3762}
3763
430afbad
YZ		 3764void ceph_mdsc_handle_fsmap(struct ceph_mds_client *mdsc, struct ceph_msg *msg)
3765{
3766 struct ceph_fs_client *fsc = mdsc->fsc;
3767 const char *mds_namespace = fsc->mount_options->mds_namespace;
3768 void *p = msg->front.iov_base;
3769 void *end = p + msg->front.iov_len;
3770 u32 epoch;
3771 u32 map_len;
3772 u32 num_fs;
3773 u32 mount_fscid = (u32)-1;
3774 u8 struct_v, struct_cv;
3775 int err = -EINVAL;
3776
3777 ceph_decode_need(&p, end, sizeof(u32), bad);
3778 epoch = ceph_decode_32(&p);
3779
3780 dout("handle_fsmap epoch %u\n", epoch);
3781
3782 ceph_decode_need(&p, end, 2 + sizeof(u32), bad);
3783 struct_v = ceph_decode_8(&p);
3784 struct_cv = ceph_decode_8(&p);
3785 map_len = ceph_decode_32(&p);
3786
3787 ceph_decode_need(&p, end, sizeof(u32) * 3, bad);
3788 p += sizeof(u32) * 2; /* skip epoch and legacy_client_fscid */
3789
3790 num_fs = ceph_decode_32(&p);
3791 while (num_fs-- > 0) {
3792 void *info_p, *info_end;
3793 u32 info_len;
3794 u8 info_v, info_cv;
3795 u32 fscid, namelen;
3796
3797 ceph_decode_need(&p, end, 2 + sizeof(u32), bad);
3798 info_v = ceph_decode_8(&p);
3799 info_cv = ceph_decode_8(&p);
3800 info_len = ceph_decode_32(&p);
3801 ceph_decode_need(&p, end, info_len, bad);
3802 info_p = p;
3803 info_end = p + info_len;
3804 p = info_end;
3805
3806 ceph_decode_need(&info_p, info_end, sizeof(u32) * 2, bad);
3807 fscid = ceph_decode_32(&info_p);
3808 namelen = ceph_decode_32(&info_p);
3809 ceph_decode_need(&info_p, info_end, namelen, bad);
3810
3811 if (mds_namespace &&
3812 strlen(mds_namespace) == namelen &&
3813 !strncmp(mds_namespace, (char *)info_p, namelen)) {
3814 mount_fscid = fscid;
3815 break;
3816 }
3817 }
3818
3819 ceph_monc_got_map(&fsc->client->monc, CEPH_SUB_FSMAP, epoch);
3820 if (mount_fscid != (u32)-1) {
3821 fsc->client->monc.fs_cluster_id = mount_fscid;
3822 ceph_monc_want_map(&fsc->client->monc, CEPH_SUB_MDSMAP,
3823 0, true);
3824 ceph_monc_renew_subs(&fsc->client->monc);
3825 } else {
3826 err = -ENOENT;
3827 goto err_out;
3828 }
3829 return;
3830bad:
3831 pr_err("error decoding fsmap\n");
3832err_out:
3833 mutex_lock(&mdsc->mutex);
3834 mdsc->mdsmap_err = -ENOENT;
3835 __wake_requests(mdsc, &mdsc->waiting_for_map);
3836 mutex_unlock(&mdsc->mutex);
3837 return;
3838}
2f2dc053
SW		 3839
3840/*
3841 * handle mds map update.
3842 */
430afbad 3843void ceph_mdsc_handle_mdsmap(struct ceph_mds_client *mdsc, struct ceph_msg *msg)
2f2dc053
SW		 3844{
3845 u32 epoch;
3846 u32 maplen;
3847 void *p = msg->front.iov_base;
3848 void *end = p + msg->front.iov_len;
3849 struct ceph_mdsmap *newmap, *oldmap;
3850 struct ceph_fsid fsid;
3851 int err = -EINVAL;
3852
3853 ceph_decode_need(&p, end, sizeof(fsid)+2*sizeof(u32), bad);
3854 ceph_decode_copy(&p, &fsid, sizeof(fsid));
3d14c5d2 3855 if (ceph_check_fsid(mdsc->fsc->client, &fsid) < 0)
0743304d 3856 return;
c89136ea
SW		 3857 epoch = ceph_decode_32(&p);
3858 maplen = ceph_decode_32(&p);
2f2dc053
SW		 3859 dout("handle_map epoch %u len %d\n", epoch, (int)maplen);
3860
3861 /* do we need it? */
2f2dc053
SW		 3862 mutex_lock(&mdsc->mutex);
3863 if (mdsc->mdsmap && epoch <= mdsc->mdsmap->m_epoch) {
3864 dout("handle_map epoch %u <= our %u\n",
3865 epoch, mdsc->mdsmap->m_epoch);
3866 mutex_unlock(&mdsc->mutex);
3867 return;
3868 }
3869
3870 newmap = ceph_mdsmap_decode(&p, end);
3871 if (IS_ERR(newmap)) {
3872 err = PTR_ERR(newmap);
3873 goto bad_unlock;
3874 }
3875
3876 /* swap into place */
3877 if (mdsc->mdsmap) {
3878 oldmap = mdsc->mdsmap;
3879 mdsc->mdsmap = newmap;
3880 check_new_map(mdsc, newmap, oldmap);
3881 ceph_mdsmap_destroy(oldmap);
3882 } else {
3883 mdsc->mdsmap = newmap; /* first mds map */
3884 }
3d14c5d2 3885 mdsc->fsc->sb->s_maxbytes = mdsc->mdsmap->m_max_file_size;
2f2dc053
SW		 3886
3887 __wake_requests(mdsc, &mdsc->waiting_for_map);
82dcabad
ID		 3888 ceph_monc_got_map(&mdsc->fsc->client->monc, CEPH_SUB_MDSMAP,
3889 mdsc->mdsmap->m_epoch);
2f2dc053
SW		 3890
3891 mutex_unlock(&mdsc->mutex);
3892 schedule_delayed(mdsc);
3893 return;
3894
3895bad_unlock:
3896 mutex_unlock(&mdsc->mutex);
3897bad:
3898 pr_err("error decoding mdsmap %d\n", err);
3899 return;
3900}
3901
3902static struct ceph_connection *con_get(struct ceph_connection *con)
3903{
3904 struct ceph_mds_session *s = con->private;
3905
3906 if (get_session(s)) {
3997c01d 3907 dout("mdsc con_get %p ok (%d)\n", s, refcount_read(&s->s_ref));
2f2dc053
SW		 3908 return con;
3909 }
3910 dout("mdsc con_get %p FAIL\n", s);
3911 return NULL;
3912}
3913
3914static void con_put(struct ceph_connection *con)
3915{
3916 struct ceph_mds_session *s = con->private;
3917
3997c01d 3918 dout("mdsc con_put %p (%d)\n", s, refcount_read(&s->s_ref) - 1);
2f2dc053
SW		 3919 ceph_put_mds_session(s);
3920}
3921
3922/*
3923 * if the client is unresponsive for long enough, the mds will kill
3924 * the session entirely.
3925 */
3926static void peer_reset(struct ceph_connection *con)
3927{
3928 struct ceph_mds_session *s = con->private;
7e70f0ed 3929 struct ceph_mds_client *mdsc = s->s_mdsc;
2f2dc053 3930
f3ae1b97 3931 pr_warn("mds%d closed our session\n", s->s_mds);
7e70f0ed 3932 send_mds_reconnect(mdsc, s);
2f2dc053
SW		 3933}
3934
3935static void dispatch(struct ceph_connection *con, struct ceph_msg *msg)
3936{
3937 struct ceph_mds_session *s = con->private;
3938 struct ceph_mds_client *mdsc = s->s_mdsc;
3939 int type = le16_to_cpu(msg->hdr.type);
3940
2600d2dd
SW		 3941 mutex_lock(&mdsc->mutex);
3942 if (__verify_registered_session(mdsc, s) < 0) {
3943 mutex_unlock(&mdsc->mutex);
3944 goto out;
3945 }
3946 mutex_unlock(&mdsc->mutex);
3947
2f2dc053
SW		 3948 switch (type) {
3949 case CEPH_MSG_MDS_MAP:
430afbad
YZ		 3950 ceph_mdsc_handle_mdsmap(mdsc, msg);
3951 break;
3952 case CEPH_MSG_FS_MAP_USER:
3953 ceph_mdsc_handle_fsmap(mdsc, msg);
2f2dc053
SW		 3954 break;
3955 case CEPH_MSG_CLIENT_SESSION:
3956 handle_session(s, msg);
3957 break;
3958 case CEPH_MSG_CLIENT_REPLY:
3959 handle_reply(s, msg);
3960 break;
3961 case CEPH_MSG_CLIENT_REQUEST_FORWARD:
2600d2dd 3962 handle_forward(mdsc, s, msg);
2f2dc053
SW		 3963 break;
3964 case CEPH_MSG_CLIENT_CAPS:
3965 ceph_handle_caps(s, msg);
3966 break;
3967 case CEPH_MSG_CLIENT_SNAP:
2600d2dd 3968 ceph_handle_snap(mdsc, s, msg);
2f2dc053
SW		 3969 break;
3970 case CEPH_MSG_CLIENT_LEASE:
2600d2dd 3971 handle_lease(mdsc, s, msg);
2f2dc053
SW		 3972 break;
3973
3974 default:
3975 pr_err("received unknown message type %d %s\n", type,
3976 ceph_msg_type_name(type));
3977 }
2600d2dd 3978out:
2f2dc053
SW		 3979 ceph_msg_put(msg);
3980}
3981
4e7a5dcd
SW		 3982/*
3983 * authentication
3984 */
a3530df3
AE		 3985
3986/*
3987 * Note: returned pointer is the address of a structure that's
3988 * managed separately. Caller must *not* attempt to free it.
3989 */
3990static struct ceph_auth_handshake *get_authorizer(struct ceph_connection *con,
8f43fb53 3991 int *proto, int force_new)
4e7a5dcd
SW		 3992{
3993 struct ceph_mds_session *s = con->private;
3994 struct ceph_mds_client *mdsc = s->s_mdsc;
3d14c5d2 3995 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
74f1869f 3996 struct ceph_auth_handshake *auth = &s->s_auth;
4e7a5dcd 3997
74f1869f 3998 if (force_new && auth->authorizer) {
6c1ea260 3999 ceph_auth_destroy_authorizer(auth->authorizer);
74f1869f 4000 auth->authorizer = NULL;
4e7a5dcd 4001 }
27859f97
SW		 4002 if (!auth->authorizer) {
4003 int ret = ceph_auth_create_authorizer(ac, CEPH_ENTITY_TYPE_MDS,
4004 auth);
0bed9b5c
SW		 4005 if (ret)
4006 return ERR_PTR(ret);
27859f97
SW		 4007 } else {
4008 int ret = ceph_auth_update_authorizer(ac, CEPH_ENTITY_TYPE_MDS,
4009 auth);
a255651d 4010 if (ret)
a3530df3 4011 return ERR_PTR(ret);
4e7a5dcd 4012 }
4e7a5dcd 4013 *proto = ac->protocol;
74f1869f 4014
a3530df3 4015 return auth;
4e7a5dcd
SW		 4016}
4017
4018
0dde5848 4019static int verify_authorizer_reply(struct ceph_connection *con)
4e7a5dcd
SW		 4020{
4021 struct ceph_mds_session *s = con->private;
4022 struct ceph_mds_client *mdsc = s->s_mdsc;
3d14c5d2 4023 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
4e7a5dcd 4024
0dde5848 4025 return ceph_auth_verify_authorizer_reply(ac, s->s_auth.authorizer);
4e7a5dcd
SW		 4026}
4027
9bd2e6f8
SW		 4028static int invalidate_authorizer(struct ceph_connection *con)
4029{
4030 struct ceph_mds_session *s = con->private;
4031 struct ceph_mds_client *mdsc = s->s_mdsc;
3d14c5d2 4032 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
9bd2e6f8 4033
27859f97 4034 ceph_auth_invalidate_authorizer(ac, CEPH_ENTITY_TYPE_MDS);
9bd2e6f8 4035
3d14c5d2 4036 return ceph_monc_validate_auth(&mdsc->fsc->client->monc);
9bd2e6f8
SW		 4037}
4038
53ded495
AE		 4039static struct ceph_msg *mds_alloc_msg(struct ceph_connection *con,
4040 struct ceph_msg_header *hdr, int *skip)
4041{
4042 struct ceph_msg *msg;
4043 int type = (int) le16_to_cpu(hdr->type);
4044 int front_len = (int) le32_to_cpu(hdr->front_len);
4045
4046 if (con->in_msg)
4047 return con->in_msg;
4048
4049 *skip = 0;
4050 msg = ceph_msg_new(type, front_len, GFP_NOFS, false);
4051 if (!msg) {
4052 pr_err("unable to allocate msg type %d len %d\n",
4053 type, front_len);
4054 return NULL;
4055 }
53ded495
AE		 4056
4057 return msg;
4058}
4059
79dbd1ba 4060static int mds_sign_message(struct ceph_msg *msg)
33d07337 4061{
79dbd1ba 4062 struct ceph_mds_session *s = msg->con->private;
33d07337 4063 struct ceph_auth_handshake *auth = &s->s_auth;
79dbd1ba 4064
33d07337
YZ		 4065 return ceph_auth_sign_message(auth, msg);
4066}
4067
79dbd1ba 4068static int mds_check_message_signature(struct ceph_msg *msg)
33d07337 4069{
79dbd1ba 4070 struct ceph_mds_session *s = msg->con->private;
33d07337 4071 struct ceph_auth_handshake *auth = &s->s_auth;
79dbd1ba 4072
33d07337
YZ		 4073 return ceph_auth_check_message_signature(auth, msg);
4074}
4075
9e32789f 4076static const struct ceph_connection_operations mds_con_ops = {
2f2dc053
SW		 4077 .get = con_get,
4078 .put = con_put,
4079 .dispatch = dispatch,
4e7a5dcd
SW		 4080 .get_authorizer = get_authorizer,
4081 .verify_authorizer_reply = verify_authorizer_reply,
9bd2e6f8 4082 .invalidate_authorizer = invalidate_authorizer,
2f2dc053 4083 .peer_reset = peer_reset,
53ded495 4084 .alloc_msg = mds_alloc_msg,
79dbd1ba
ID		 4085 .sign_message = mds_sign_message,
4086 .check_message_signature = mds_check_message_signature,
2f2dc053
SW		 4087};
4088
2f2dc053 4089/* eof */
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