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ceph: re-send flushing caps (which are revoked) in reconnect stage
[mirror_ubuntu-eoan-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45 * are no longer valid.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
SW		 50 struct ceph_pagelist *pagelist;
51 bool flock;
52};
53
2f2dc053
SW		 54static void __wake_requests(struct ceph_mds_client *mdsc,
55 struct list_head *head);
56
9e32789f 57static const struct ceph_connection_operations mds_con_ops;
2f2dc053
SW		 58
59
60/*
61 * mds reply parsing
62 */
63
64/*
65 * parse individual inode info
66 */
67static int parse_reply_info_in(void **p, void *end,
14303d20 68 struct ceph_mds_reply_info_in *info,
12b4629a 69 u64 features)
2f2dc053
SW		 70{
71 int err = -EIO;
72
73 info->in = *p;
74 *p += sizeof(struct ceph_mds_reply_inode) +
75 sizeof(*info->in->fragtree.splits) *
76 le32_to_cpu(info->in->fragtree.nsplits);
77
78 ceph_decode_32_safe(p, end, info->symlink_len, bad);
79 ceph_decode_need(p, end, info->symlink_len, bad);
80 info->symlink = *p;
81 *p += info->symlink_len;
82
14303d20
SW		 83 if (features & CEPH_FEATURE_DIRLAYOUTHASH)
84 ceph_decode_copy_safe(p, end, &info->dir_layout,
85 sizeof(info->dir_layout), bad);
86 else
87 memset(&info->dir_layout, 0, sizeof(info->dir_layout));
88
2f2dc053
SW		 89 ceph_decode_32_safe(p, end, info->xattr_len, bad);
90 ceph_decode_need(p, end, info->xattr_len, bad);
91 info->xattr_data = *p;
92 *p += info->xattr_len;
fb01d1f8
YZ		 93
94 if (features & CEPH_FEATURE_MDS_INLINE_DATA) {
95 ceph_decode_64_safe(p, end, info->inline_version, bad);
96 ceph_decode_32_safe(p, end, info->inline_len, bad);
97 ceph_decode_need(p, end, info->inline_len, bad);
98 info->inline_data = *p;
99 *p += info->inline_len;
100 } else
101 info->inline_version = CEPH_INLINE_NONE;
102
2f2dc053
SW		 103 return 0;
104bad:
105 return err;
106}
107
108/*
109 * parse a normal reply, which may contain a (dir+)dentry and/or a
110 * target inode.
111 */
112static int parse_reply_info_trace(void **p, void *end,
14303d20 113 struct ceph_mds_reply_info_parsed *info,
12b4629a 114 u64 features)
2f2dc053
SW		 115{
116 int err;
117
118 if (info->head->is_dentry) {
14303d20 119 err = parse_reply_info_in(p, end, &info->diri, features);
2f2dc053
SW		 120 if (err < 0)
121 goto out_bad;
122
123 if (unlikely(*p + sizeof(*info->dirfrag) > end))
124 goto bad;
125 info->dirfrag = *p;
126 *p += sizeof(*info->dirfrag) +
127 sizeof(u32)*le32_to_cpu(info->dirfrag->ndist);
128 if (unlikely(*p > end))
129 goto bad;
130
131 ceph_decode_32_safe(p, end, info->dname_len, bad);
132 ceph_decode_need(p, end, info->dname_len, bad);
133 info->dname = *p;
134 *p += info->dname_len;
135 info->dlease = *p;
136 *p += sizeof(*info->dlease);
137 }
138
139 if (info->head->is_target) {
14303d20 140 err = parse_reply_info_in(p, end, &info->targeti, features);
2f2dc053
SW		 141 if (err < 0)
142 goto out_bad;
143 }
144
145 if (unlikely(*p != end))
146 goto bad;
147 return 0;
148
149bad:
150 err = -EIO;
151out_bad:
152 pr_err("problem parsing mds trace %d\n", err);
153 return err;
154}
155
156/*
157 * parse readdir results
158 */
159static int parse_reply_info_dir(void **p, void *end,
14303d20 160 struct ceph_mds_reply_info_parsed *info,
12b4629a 161 u64 features)
2f2dc053
SW		 162{
163 u32 num, i = 0;
164 int err;
165
166 info->dir_dir = *p;
167 if (*p + sizeof(*info->dir_dir) > end)
168 goto bad;
169 *p += sizeof(*info->dir_dir) +
170 sizeof(u32)*le32_to_cpu(info->dir_dir->ndist);
171 if (*p > end)
172 goto bad;
173
174 ceph_decode_need(p, end, sizeof(num) + 2, bad);
c89136ea
SW		 175 num = ceph_decode_32(p);
176 info->dir_end = ceph_decode_8(p);
177 info->dir_complete = ceph_decode_8(p);
2f2dc053
SW		 178 if (num == 0)
179 goto done;
180
54008399 181 BUG_ON(!info->dir_in);
2f2dc053
SW		 182 info->dir_dname = (void *)(info->dir_in + num);
183 info->dir_dname_len = (void *)(info->dir_dname + num);
184 info->dir_dlease = (void *)(info->dir_dname_len + num);
54008399
YZ		 185 if ((unsigned long)(info->dir_dlease + num) >
186 (unsigned long)info->dir_in + info->dir_buf_size) {
187 pr_err("dir contents are larger than expected\n");
188 WARN_ON(1);
189 goto bad;
190 }
2f2dc053 191
54008399 192 info->dir_nr = num;
2f2dc053
SW		 193 while (num) {
194 /* dentry */
195 ceph_decode_need(p, end, sizeof(u32)*2, bad);
c89136ea 196 info->dir_dname_len[i] = ceph_decode_32(p);
2f2dc053
SW		 197 ceph_decode_need(p, end, info->dir_dname_len[i], bad);
198 info->dir_dname[i] = *p;
199 *p += info->dir_dname_len[i];
200 dout("parsed dir dname '%.*s'\n", info->dir_dname_len[i],
201 info->dir_dname[i]);
202 info->dir_dlease[i] = *p;
203 *p += sizeof(struct ceph_mds_reply_lease);
204
205 /* inode */
14303d20 206 err = parse_reply_info_in(p, end, &info->dir_in[i], features);
2f2dc053
SW		 207 if (err < 0)
208 goto out_bad;
209 i++;
210 num--;
211 }
212
213done:
214 if (*p != end)
215 goto bad;
216 return 0;
217
218bad:
219 err = -EIO;
220out_bad:
221 pr_err("problem parsing dir contents %d\n", err);
222 return err;
223}
224
25933abd
HS		 225/*
226 * parse fcntl F_GETLK results
227 */
228static int parse_reply_info_filelock(void **p, void *end,
14303d20 229 struct ceph_mds_reply_info_parsed *info,
12b4629a 230 u64 features)
25933abd
HS		 231{
232 if (*p + sizeof(*info->filelock_reply) > end)
233 goto bad;
234
235 info->filelock_reply = *p;
236 *p += sizeof(*info->filelock_reply);
237
238 if (unlikely(*p != end))
239 goto bad;
240 return 0;
241
242bad:
243 return -EIO;
244}
245
6e8575fa
SL		 246/*
247 * parse create results
248 */
249static int parse_reply_info_create(void **p, void *end,
250 struct ceph_mds_reply_info_parsed *info,
12b4629a 251 u64 features)
6e8575fa
SL		 252{
253 if (features & CEPH_FEATURE_REPLY_CREATE_INODE) {
254 if (*p == end) {
255 info->has_create_ino = false;
256 } else {
257 info->has_create_ino = true;
258 info->ino = ceph_decode_64(p);
259 }
260 }
261
262 if (unlikely(*p != end))
263 goto bad;
264 return 0;
265
266bad:
267 return -EIO;
268}
269
25933abd
HS		 270/*
271 * parse extra results
272 */
273static int parse_reply_info_extra(void **p, void *end,
14303d20 274 struct ceph_mds_reply_info_parsed *info,
12b4629a 275 u64 features)
25933abd
HS		 276{
277 if (info->head->op == CEPH_MDS_OP_GETFILELOCK)
14303d20 278 return parse_reply_info_filelock(p, end, info, features);
8a034497
YZ		 279 else if (info->head->op == CEPH_MDS_OP_READDIR ||
280 info->head->op == CEPH_MDS_OP_LSSNAP)
14303d20 281 return parse_reply_info_dir(p, end, info, features);
6e8575fa
SL		 282 else if (info->head->op == CEPH_MDS_OP_CREATE)
283 return parse_reply_info_create(p, end, info, features);
284 else
285 return -EIO;
25933abd
HS		 286}
287
2f2dc053
SW		 288/*
289 * parse entire mds reply
290 */
291static int parse_reply_info(struct ceph_msg *msg,
14303d20 292 struct ceph_mds_reply_info_parsed *info,
12b4629a 293 u64 features)
2f2dc053
SW		 294{
295 void *p, *end;
296 u32 len;
297 int err;
298
299 info->head = msg->front.iov_base;
300 p = msg->front.iov_base + sizeof(struct ceph_mds_reply_head);
301 end = p + msg->front.iov_len - sizeof(struct ceph_mds_reply_head);
302
303 /* trace */
304 ceph_decode_32_safe(&p, end, len, bad);
305 if (len > 0) {
32852a81 306 ceph_decode_need(&p, end, len, bad);
14303d20 307 err = parse_reply_info_trace(&p, p+len, info, features);
2f2dc053
SW		 308 if (err < 0)
309 goto out_bad;
310 }
311
25933abd 312 /* extra */
2f2dc053
SW		 313 ceph_decode_32_safe(&p, end, len, bad);
314 if (len > 0) {
32852a81 315 ceph_decode_need(&p, end, len, bad);
14303d20 316 err = parse_reply_info_extra(&p, p+len, info, features);
2f2dc053
SW		 317 if (err < 0)
318 goto out_bad;
319 }
320
321 /* snap blob */
322 ceph_decode_32_safe(&p, end, len, bad);
323 info->snapblob_len = len;
324 info->snapblob = p;
325 p += len;
326
327 if (p != end)
328 goto bad;
329 return 0;
330
331bad:
332 err = -EIO;
333out_bad:
334 pr_err("mds parse_reply err %d\n", err);
335 return err;
336}
337
338static void destroy_reply_info(struct ceph_mds_reply_info_parsed *info)
339{
54008399
YZ		 340 if (!info->dir_in)
341 return;
342 free_pages((unsigned long)info->dir_in, get_order(info->dir_buf_size));
2f2dc053
SW		 343}
344
345
346/*
347 * sessions
348 */
a687ecaf 349const char *ceph_session_state_name(int s)
2f2dc053
SW		 350{
351 switch (s) {
352 case CEPH_MDS_SESSION_NEW: return "new";
353 case CEPH_MDS_SESSION_OPENING: return "opening";
354 case CEPH_MDS_SESSION_OPEN: return "open";
355 case CEPH_MDS_SESSION_HUNG: return "hung";
356 case CEPH_MDS_SESSION_CLOSING: return "closing";
44ca18f2 357 case CEPH_MDS_SESSION_RESTARTING: return "restarting";
2f2dc053
SW		 358 case CEPH_MDS_SESSION_RECONNECTING: return "reconnecting";
359 default: return "???";
360 }
361}
362
363static struct ceph_mds_session *get_session(struct ceph_mds_session *s)
364{
365 if (atomic_inc_not_zero(&s->s_ref)) {
366 dout("mdsc get_session %p %d -> %d\n", s,
367 atomic_read(&s->s_ref)-1, atomic_read(&s->s_ref));
368 return s;
369 } else {
370 dout("mdsc get_session %p 0 -- FAIL", s);
371 return NULL;
372 }
373}
374
375void ceph_put_mds_session(struct ceph_mds_session *s)
376{
377 dout("mdsc put_session %p %d -> %d\n", s,
378 atomic_read(&s->s_ref), atomic_read(&s->s_ref)-1);
4e7a5dcd 379 if (atomic_dec_and_test(&s->s_ref)) {
6c4a1915 380 if (s->s_auth.authorizer)
27859f97
SW		 381 ceph_auth_destroy_authorizer(
382 s->s_mdsc->fsc->client->monc.auth,
383 s->s_auth.authorizer);
2f2dc053 384 kfree(s);
4e7a5dcd 385 }
2f2dc053
SW		 386}
387
388/*
389 * called under mdsc->mutex
390 */
391struct ceph_mds_session *__ceph_lookup_mds_session(struct ceph_mds_client *mdsc,
392 int mds)
393{
394 struct ceph_mds_session *session;
395
396 if (mds >= mdsc->max_sessions || mdsc->sessions[mds] == NULL)
397 return NULL;
398 session = mdsc->sessions[mds];
399 dout("lookup_mds_session %p %d\n", session,
400 atomic_read(&session->s_ref));
401 get_session(session);
402 return session;
403}
404
405static bool __have_session(struct ceph_mds_client *mdsc, int mds)
406{
407 if (mds >= mdsc->max_sessions)
408 return false;
409 return mdsc->sessions[mds];
410}
411
2600d2dd
SW		 412static int __verify_registered_session(struct ceph_mds_client *mdsc,
413 struct ceph_mds_session *s)
414{
415 if (s->s_mds >= mdsc->max_sessions ||
416 mdsc->sessions[s->s_mds] != s)
417 return -ENOENT;
418 return 0;
419}
420
2f2dc053
SW		 421/*
422 * create+register a new session for given mds.
423 * called under mdsc->mutex.
424 */
425static struct ceph_mds_session *register_session(struct ceph_mds_client *mdsc,
426 int mds)
427{
428 struct ceph_mds_session *s;
429
c338c07c
NY		 430 if (mds >= mdsc->mdsmap->m_max_mds)
431 return ERR_PTR(-EINVAL);
432
2f2dc053 433 s = kzalloc(sizeof(*s), GFP_NOFS);
4736b009
DC		 434 if (!s)
435 return ERR_PTR(-ENOMEM);
2f2dc053
SW		 436 s->s_mdsc = mdsc;
437 s->s_mds = mds;
438 s->s_state = CEPH_MDS_SESSION_NEW;
439 s->s_ttl = 0;
440 s->s_seq = 0;
441 mutex_init(&s->s_mutex);
442
b7a9e5dd 443 ceph_con_init(&s->s_con, s, &mds_con_ops, &mdsc->fsc->client->msgr);
2f2dc053 444
d8fb02ab 445 spin_lock_init(&s->s_gen_ttl_lock);
2f2dc053 446 s->s_cap_gen = 0;
1ce208a6 447 s->s_cap_ttl = jiffies - 1;
d8fb02ab
AE		 448
449 spin_lock_init(&s->s_cap_lock);
2f2dc053
SW		 450 s->s_renew_requested = 0;
451 s->s_renew_seq = 0;
452 INIT_LIST_HEAD(&s->s_caps);
453 s->s_nr_caps = 0;
5dacf091 454 s->s_trim_caps = 0;
2f2dc053
SW		 455 atomic_set(&s->s_ref, 1);
456 INIT_LIST_HEAD(&s->s_waiting);
457 INIT_LIST_HEAD(&s->s_unsafe);
458 s->s_num_cap_releases = 0;
99a9c273 459 s->s_cap_reconnect = 0;
7c1332b8 460 s->s_cap_iterator = NULL;
2f2dc053 461 INIT_LIST_HEAD(&s->s_cap_releases);
2f2dc053
SW		 462 INIT_LIST_HEAD(&s->s_cap_flushing);
463 INIT_LIST_HEAD(&s->s_cap_snaps_flushing);
464
465 dout("register_session mds%d\n", mds);
466 if (mds >= mdsc->max_sessions) {
467 int newmax = 1 << get_count_order(mds+1);
468 struct ceph_mds_session **sa;
469
470 dout("register_session realloc to %d\n", newmax);
471 sa = kcalloc(newmax, sizeof(void *), GFP_NOFS);
472 if (sa == NULL)
42ce56e5 473 goto fail_realloc;
2f2dc053
SW		 474 if (mdsc->sessions) {
475 memcpy(sa, mdsc->sessions,
476 mdsc->max_sessions * sizeof(void *));
477 kfree(mdsc->sessions);
478 }
479 mdsc->sessions = sa;
480 mdsc->max_sessions = newmax;
481 }
482 mdsc->sessions[mds] = s;
86d8f67b 483 atomic_inc(&mdsc->num_sessions);
2f2dc053 484 atomic_inc(&s->s_ref); /* one ref to sessions[], one to caller */
42ce56e5 485
b7a9e5dd
SW		 486 ceph_con_open(&s->s_con, CEPH_ENTITY_TYPE_MDS, mds,
487 ceph_mdsmap_get_addr(mdsc->mdsmap, mds));
42ce56e5 488
2f2dc053 489 return s;
42ce56e5
SW		 490
491fail_realloc:
492 kfree(s);
493 return ERR_PTR(-ENOMEM);
2f2dc053
SW		 494}
495
496/*
497 * called under mdsc->mutex
498 */
2600d2dd 499static void __unregister_session(struct ceph_mds_client *mdsc,
42ce56e5 500 struct ceph_mds_session *s)
2f2dc053 501{
2600d2dd
SW		 502 dout("__unregister_session mds%d %p\n", s->s_mds, s);
503 BUG_ON(mdsc->sessions[s->s_mds] != s);
42ce56e5
SW		 504 mdsc->sessions[s->s_mds] = NULL;
505 ceph_con_close(&s->s_con);
506 ceph_put_mds_session(s);
86d8f67b 507 atomic_dec(&mdsc->num_sessions);
2f2dc053
SW		 508}
509
510/*
511 * drop session refs in request.
512 *
513 * should be last request ref, or hold mdsc->mutex
514 */
515static void put_request_session(struct ceph_mds_request *req)
516{
517 if (req->r_session) {
518 ceph_put_mds_session(req->r_session);
519 req->r_session = NULL;
520 }
521}
522
153c8e6b 523void ceph_mdsc_release_request(struct kref *kref)
2f2dc053 524{
153c8e6b
SW		 525 struct ceph_mds_request *req = container_of(kref,
526 struct ceph_mds_request,
527 r_kref);
54008399 528 destroy_reply_info(&req->r_reply_info);
153c8e6b
SW		 529 if (req->r_request)
530 ceph_msg_put(req->r_request);
54008399 531 if (req->r_reply)
153c8e6b 532 ceph_msg_put(req->r_reply);
153c8e6b 533 if (req->r_inode) {
41b02e1f 534 ceph_put_cap_refs(ceph_inode(req->r_inode), CEPH_CAP_PIN);
153c8e6b
SW		 535 iput(req->r_inode);
536 }
537 if (req->r_locked_dir)
41b02e1f 538 ceph_put_cap_refs(ceph_inode(req->r_locked_dir), CEPH_CAP_PIN);
e96a650a 539 iput(req->r_target_inode);
153c8e6b
SW		 540 if (req->r_dentry)
541 dput(req->r_dentry);
844d87c3
SW		 542 if (req->r_old_dentry)
543 dput(req->r_old_dentry);
544 if (req->r_old_dentry_dir) {
41b02e1f
SW		 545 /*
546 * track (and drop pins for) r_old_dentry_dir
547 * separately, since r_old_dentry's d_parent may have
548 * changed between the dir mutex being dropped and
549 * this request being freed.
550 */
551 ceph_put_cap_refs(ceph_inode(req->r_old_dentry_dir),
552 CEPH_CAP_PIN);
41b02e1f 553 iput(req->r_old_dentry_dir);
2f2dc053 554 }
153c8e6b
SW		 555 kfree(req->r_path1);
556 kfree(req->r_path2);
25e6bae3
YZ		 557 if (req->r_pagelist)
558 ceph_pagelist_release(req->r_pagelist);
153c8e6b 559 put_request_session(req);
37151668 560 ceph_unreserve_caps(req->r_mdsc, &req->r_caps_reservation);
153c8e6b 561 kfree(req);
2f2dc053
SW		 562}
563
564/*
565 * lookup session, bump ref if found.
566 *
567 * called under mdsc->mutex.
568 */
569static struct ceph_mds_request *__lookup_request(struct ceph_mds_client *mdsc,
570 u64 tid)
571{
572 struct ceph_mds_request *req;
44ca18f2
SW		 573 struct rb_node *n = mdsc->request_tree.rb_node;
574
575 while (n) {
576 req = rb_entry(n, struct ceph_mds_request, r_node);
577 if (tid < req->r_tid)
578 n = n->rb_left;
579 else if (tid > req->r_tid)
580 n = n->rb_right;
581 else {
582 ceph_mdsc_get_request(req);
583 return req;
584 }
585 }
586 return NULL;
587}
588
589static void __insert_request(struct ceph_mds_client *mdsc,
590 struct ceph_mds_request *new)
591{
592 struct rb_node **p = &mdsc->request_tree.rb_node;
593 struct rb_node *parent = NULL;
594 struct ceph_mds_request *req = NULL;
595
596 while (*p) {
597 parent = *p;
598 req = rb_entry(parent, struct ceph_mds_request, r_node);
599 if (new->r_tid < req->r_tid)
600 p = &(*p)->rb_left;
601 else if (new->r_tid > req->r_tid)
602 p = &(*p)->rb_right;
603 else
604 BUG();
605 }
606
607 rb_link_node(&new->r_node, parent, p);
608 rb_insert_color(&new->r_node, &mdsc->request_tree);
2f2dc053
SW		 609}
610
611/*
612 * Register an in-flight request, and assign a tid. Link to directory
613 * are modifying (if any).
614 *
615 * Called under mdsc->mutex.
616 */
617static void __register_request(struct ceph_mds_client *mdsc,
618 struct ceph_mds_request *req,
619 struct inode *dir)
620{
621 req->r_tid = ++mdsc->last_tid;
622 if (req->r_num_caps)
37151668
YS		 623 ceph_reserve_caps(mdsc, &req->r_caps_reservation,
624 req->r_num_caps);
2f2dc053
SW		 625 dout("__register_request %p tid %lld\n", req, req->r_tid);
626 ceph_mdsc_get_request(req);
44ca18f2 627 __insert_request(mdsc, req);
2f2dc053 628
cb4276cc
SW		 629 req->r_uid = current_fsuid();
630 req->r_gid = current_fsgid();
631
e8a7b8b1
YZ		 632 if (mdsc->oldest_tid == 0 && req->r_op != CEPH_MDS_OP_SETFILELOCK)
633 mdsc->oldest_tid = req->r_tid;
634
2f2dc053
SW		 635 if (dir) {
636 struct ceph_inode_info *ci = ceph_inode(dir);
637
3b663780 638 ihold(dir);
2f2dc053
SW		 639 spin_lock(&ci->i_unsafe_lock);
640 req->r_unsafe_dir = dir;
641 list_add_tail(&req->r_unsafe_dir_item, &ci->i_unsafe_dirops);
642 spin_unlock(&ci->i_unsafe_lock);
643 }
644}
645
646static void __unregister_request(struct ceph_mds_client *mdsc,
647 struct ceph_mds_request *req)
648{
649 dout("__unregister_request %p tid %lld\n", req, req->r_tid);
e8a7b8b1
YZ		 650
651 if (req->r_tid == mdsc->oldest_tid) {
652 struct rb_node *p = rb_next(&req->r_node);
653 mdsc->oldest_tid = 0;
654 while (p) {
655 struct ceph_mds_request *next_req =
656 rb_entry(p, struct ceph_mds_request, r_node);
657 if (next_req->r_op != CEPH_MDS_OP_SETFILELOCK) {
658 mdsc->oldest_tid = next_req->r_tid;
659 break;
660 }
661 p = rb_next(p);
662 }
663 }
664
44ca18f2 665 rb_erase(&req->r_node, &mdsc->request_tree);
80fc7314 666 RB_CLEAR_NODE(&req->r_node);
2f2dc053
SW		 667
668 if (req->r_unsafe_dir) {
669 struct ceph_inode_info *ci = ceph_inode(req->r_unsafe_dir);
670
671 spin_lock(&ci->i_unsafe_lock);
672 list_del_init(&req->r_unsafe_dir_item);
673 spin_unlock(&ci->i_unsafe_lock);
3b663780
SW		 674
675 iput(req->r_unsafe_dir);
676 req->r_unsafe_dir = NULL;
2f2dc053 677 }
94aa8ae1 678
fc55d2c9
YZ		 679 complete_all(&req->r_safe_completion);
680
94aa8ae1 681 ceph_mdsc_put_request(req);
2f2dc053
SW		 682}
683
684/*
685 * Choose mds to send request to next. If there is a hint set in the
686 * request (e.g., due to a prior forward hint from the mds), use that.
687 * Otherwise, consult frag tree and/or caps to identify the
688 * appropriate mds. If all else fails, choose randomly.
689 *
690 * Called under mdsc->mutex.
691 */
7fd7d101 692static struct dentry *get_nonsnap_parent(struct dentry *dentry)
eb6bb1c5 693{
d79698da
SW		 694 /*
695 * we don't need to worry about protecting the d_parent access
696 * here because we never renaming inside the snapped namespace
697 * except to resplice to another snapdir, and either the old or new
698 * result is a valid result.
699 */
2b0143b5 700 while (!IS_ROOT(dentry) && ceph_snap(d_inode(dentry)) != CEPH_NOSNAP)
eb6bb1c5
SW		 701 dentry = dentry->d_parent;
702 return dentry;
703}
704
2f2dc053
SW		 705static int __choose_mds(struct ceph_mds_client *mdsc,
706 struct ceph_mds_request *req)
707{
708 struct inode *inode;
709 struct ceph_inode_info *ci;
710 struct ceph_cap *cap;
711 int mode = req->r_direct_mode;
712 int mds = -1;
713 u32 hash = req->r_direct_hash;
714 bool is_hash = req->r_direct_is_hash;
715
716 /*
717 * is there a specific mds we should try? ignore hint if we have
718 * no session and the mds is not up (active or recovering).
719 */
720 if (req->r_resend_mds >= 0 &&
721 (__have_session(mdsc, req->r_resend_mds) ||
722 ceph_mdsmap_get_state(mdsc->mdsmap, req->r_resend_mds) > 0)) {
723 dout("choose_mds using resend_mds mds%d\n",
724 req->r_resend_mds);
725 return req->r_resend_mds;
726 }
727
728 if (mode == USE_RANDOM_MDS)
729 goto random;
730
731 inode = NULL;
732 if (req->r_inode) {
733 inode = req->r_inode;
734 } else if (req->r_dentry) {
d79698da
SW		 735 /* ignore race with rename; old or new d_parent is okay */
736 struct dentry *parent = req->r_dentry->d_parent;
2b0143b5 737 struct inode *dir = d_inode(parent);
eb6bb1c5 738
3d14c5d2 739 if (dir->i_sb != mdsc->fsc->sb) {
eb6bb1c5 740 /* not this fs! */
2b0143b5 741 inode = d_inode(req->r_dentry);
eb6bb1c5
SW		 742 } else if (ceph_snap(dir) != CEPH_NOSNAP) {
743 /* direct snapped/virtual snapdir requests
744 * based on parent dir inode */
d79698da 745 struct dentry *dn = get_nonsnap_parent(parent);
2b0143b5 746 inode = d_inode(dn);
eb6bb1c5 747 dout("__choose_mds using nonsnap parent %p\n", inode);
ca18bede 748 } else {
eb6bb1c5 749 /* dentry target */
2b0143b5 750 inode = d_inode(req->r_dentry);
ca18bede
YZ		 751 if (!inode || mode == USE_AUTH_MDS) {
752 /* dir + name */
753 inode = dir;
754 hash = ceph_dentry_hash(dir, req->r_dentry);
755 is_hash = true;
756 }
2f2dc053
SW		 757 }
758 }
eb6bb1c5 759
2f2dc053
SW		 760 dout("__choose_mds %p is_hash=%d (%d) mode %d\n", inode, (int)is_hash,
761 (int)hash, mode);
762 if (!inode)
763 goto random;
764 ci = ceph_inode(inode);
765
766 if (is_hash && S_ISDIR(inode->i_mode)) {
767 struct ceph_inode_frag frag;
768 int found;
769
770 ceph_choose_frag(ci, hash, &frag, &found);
771 if (found) {
772 if (mode == USE_ANY_MDS && frag.ndist > 0) {
773 u8 r;
774
775 /* choose a random replica */
776 get_random_bytes(&r, 1);
777 r %= frag.ndist;
778 mds = frag.dist[r];
779 dout("choose_mds %p %llx.%llx "
780 "frag %u mds%d (%d/%d)\n",
781 inode, ceph_vinop(inode),
d66bbd44 782 frag.frag, mds,
2f2dc053 783 (int)r, frag.ndist);
d66bbd44
SW		 784 if (ceph_mdsmap_get_state(mdsc->mdsmap, mds) >=
785 CEPH_MDS_STATE_ACTIVE)
786 return mds;
2f2dc053
SW		 787 }
788
789 /* since this file/dir wasn't known to be
790 * replicated, then we want to look for the
791 * authoritative mds. */
792 mode = USE_AUTH_MDS;
793 if (frag.mds >= 0) {
794 /* choose auth mds */
795 mds = frag.mds;
796 dout("choose_mds %p %llx.%llx "
797 "frag %u mds%d (auth)\n",
798 inode, ceph_vinop(inode), frag.frag, mds);
d66bbd44
SW		 799 if (ceph_mdsmap_get_state(mdsc->mdsmap, mds) >=
800 CEPH_MDS_STATE_ACTIVE)
801 return mds;
2f2dc053
SW		 802 }
803 }
804 }
805
be655596 806 spin_lock(&ci->i_ceph_lock);
2f2dc053
SW		 807 cap = NULL;
808 if (mode == USE_AUTH_MDS)
809 cap = ci->i_auth_cap;
810 if (!cap && !RB_EMPTY_ROOT(&ci->i_caps))
811 cap = rb_entry(rb_first(&ci->i_caps), struct ceph_cap, ci_node);
812 if (!cap) {
be655596 813 spin_unlock(&ci->i_ceph_lock);
2f2dc053
SW		 814 goto random;
815 }
816 mds = cap->session->s_mds;
817 dout("choose_mds %p %llx.%llx mds%d (%scap %p)\n",
818 inode, ceph_vinop(inode), mds,
819 cap == ci->i_auth_cap ? "auth " : "", cap);
be655596 820 spin_unlock(&ci->i_ceph_lock);
2f2dc053
SW		 821 return mds;
822
823random:
824 mds = ceph_mdsmap_get_random_mds(mdsc->mdsmap);
825 dout("choose_mds chose random mds%d\n", mds);
826 return mds;
827}
828
829
830/*
831 * session messages
832 */
833static struct ceph_msg *create_session_msg(u32 op, u64 seq)
834{
835 struct ceph_msg *msg;
836 struct ceph_mds_session_head *h;
837
b61c2763
SW		 838 msg = ceph_msg_new(CEPH_MSG_CLIENT_SESSION, sizeof(*h), GFP_NOFS,
839 false);
a79832f2 840 if (!msg) {
2f2dc053 841 pr_err("create_session_msg ENOMEM creating msg\n");
a79832f2 842 return NULL;
2f2dc053
SW		 843 }
844 h = msg->front.iov_base;
845 h->op = cpu_to_le32(op);
846 h->seq = cpu_to_le64(seq);
dbd0c8bf
JS		 847
848 return msg;
849}
850
851/*
852 * session message, specialization for CEPH_SESSION_REQUEST_OPEN
853 * to include additional client metadata fields.
854 */
855static struct ceph_msg *create_session_open_msg(struct ceph_mds_client *mdsc, u64 seq)
856{
857 struct ceph_msg *msg;
858 struct ceph_mds_session_head *h;
859 int i = -1;
860 int metadata_bytes = 0;
861 int metadata_key_count = 0;
862 struct ceph_options *opt = mdsc->fsc->client->options;
863 void *p;
864
a6a5ce4f 865 const char* metadata[][2] = {
dbd0c8bf 866 {"hostname", utsname()->nodename},
a6a5ce4f 867 {"kernel_version", utsname()->release},
dbd0c8bf
JS		 868 {"entity_id", opt->name ? opt->name : ""},
869 {NULL, NULL}
870 };
871
872 /* Calculate serialized length of metadata */
873 metadata_bytes = 4; /* map length */
874 for (i = 0; metadata[i][0] != NULL; ++i) {
875 metadata_bytes += 8 + strlen(metadata[i][0]) +
876 strlen(metadata[i][1]);
877 metadata_key_count++;
878 }
879
880 /* Allocate the message */
881 msg = ceph_msg_new(CEPH_MSG_CLIENT_SESSION, sizeof(*h) + metadata_bytes,
882 GFP_NOFS, false);
883 if (!msg) {
884 pr_err("create_session_msg ENOMEM creating msg\n");
885 return NULL;
886 }
887 h = msg->front.iov_base;
888 h->op = cpu_to_le32(CEPH_SESSION_REQUEST_OPEN);
889 h->seq = cpu_to_le64(seq);
890
891 /*
892 * Serialize client metadata into waiting buffer space, using
893 * the format that userspace expects for map<string, string>
7cfa0313
JS		 894 *
895 * ClientSession messages with metadata are v2
dbd0c8bf 896 */
7cfa0313
JS		 897 msg->hdr.version = cpu_to_le16(2);
898 msg->hdr.compat_version = cpu_to_le16(1);
dbd0c8bf
JS		 899
900 /* The write pointer, following the session_head structure */
901 p = msg->front.iov_base + sizeof(*h);
902
903 /* Number of entries in the map */
904 ceph_encode_32(&p, metadata_key_count);
905
906 /* Two length-prefixed strings for each entry in the map */
907 for (i = 0; metadata[i][0] != NULL; ++i) {
908 size_t const key_len = strlen(metadata[i][0]);
909 size_t const val_len = strlen(metadata[i][1]);
910
911 ceph_encode_32(&p, key_len);
912 memcpy(p, metadata[i][0], key_len);
913 p += key_len;
914 ceph_encode_32(&p, val_len);
915 memcpy(p, metadata[i][1], val_len);
916 p += val_len;
917 }
918
2f2dc053
SW		 919 return msg;
920}
921
922/*
923 * send session open request.
924 *
925 * called under mdsc->mutex
926 */
927static int __open_session(struct ceph_mds_client *mdsc,
928 struct ceph_mds_session *session)
929{
930 struct ceph_msg *msg;
931 int mstate;
932 int mds = session->s_mds;
2f2dc053
SW		 933
934 /* wait for mds to go active? */
935 mstate = ceph_mdsmap_get_state(mdsc->mdsmap, mds);
936 dout("open_session to mds%d (%s)\n", mds,
937 ceph_mds_state_name(mstate));
938 session->s_state = CEPH_MDS_SESSION_OPENING;
939 session->s_renew_requested = jiffies;
940
941 /* send connect message */
dbd0c8bf 942 msg = create_session_open_msg(mdsc, session->s_seq);
a79832f2
SW		 943 if (!msg)
944 return -ENOMEM;
2f2dc053 945 ceph_con_send(&session->s_con, msg);
2f2dc053
SW		 946 return 0;
947}
948
ed0552a1
SW		 949/*
950 * open sessions for any export targets for the given mds
951 *
952 * called under mdsc->mutex
953 */
5d72d13c
YZ		 954static struct ceph_mds_session *
955__open_export_target_session(struct ceph_mds_client *mdsc, int target)
956{
957 struct ceph_mds_session *session;
958
959 session = __ceph_lookup_mds_session(mdsc, target);
960 if (!session) {
961 session = register_session(mdsc, target);
962 if (IS_ERR(session))
963 return session;
964 }
965 if (session->s_state == CEPH_MDS_SESSION_NEW ||
966 session->s_state == CEPH_MDS_SESSION_CLOSING)
967 __open_session(mdsc, session);
968
969 return session;
970}
971
972struct ceph_mds_session *
973ceph_mdsc_open_export_target_session(struct ceph_mds_client *mdsc, int target)
974{
975 struct ceph_mds_session *session;
976
977 dout("open_export_target_session to mds%d\n", target);
978
979 mutex_lock(&mdsc->mutex);
980 session = __open_export_target_session(mdsc, target);
981 mutex_unlock(&mdsc->mutex);
982
983 return session;
984}
985
ed0552a1
SW		 986static void __open_export_target_sessions(struct ceph_mds_client *mdsc,
987 struct ceph_mds_session *session)
988{
989 struct ceph_mds_info *mi;
990 struct ceph_mds_session *ts;
991 int i, mds = session->s_mds;
ed0552a1
SW		 992
993 if (mds >= mdsc->mdsmap->m_max_mds)
994 return;
5d72d13c 995
ed0552a1
SW		 996 mi = &mdsc->mdsmap->m_info[mds];
997 dout("open_export_target_sessions for mds%d (%d targets)\n",
998 session->s_mds, mi->num_export_targets);
999
1000 for (i = 0; i < mi->num_export_targets; i++) {
5d72d13c
YZ		 1001 ts = __open_export_target_session(mdsc, mi->export_targets[i]);
1002 if (!IS_ERR(ts))
1003 ceph_put_mds_session(ts);
ed0552a1
SW		 1004 }
1005}
1006
154f42c2
SW		 1007void ceph_mdsc_open_export_target_sessions(struct ceph_mds_client *mdsc,
1008 struct ceph_mds_session *session)
1009{
1010 mutex_lock(&mdsc->mutex);
1011 __open_export_target_sessions(mdsc, session);
1012 mutex_unlock(&mdsc->mutex);
1013}
1014
2f2dc053
SW		 1015/*
1016 * session caps
1017 */
1018
745a8e3b
YZ		 1019/* caller holds s_cap_lock, we drop it */
1020static void cleanup_cap_releases(struct ceph_mds_client *mdsc,
1021 struct ceph_mds_session *session)
1022 __releases(session->s_cap_lock)
2f2dc053 1023{
745a8e3b
YZ		 1024 LIST_HEAD(tmp_list);
1025 list_splice_init(&session->s_cap_releases, &tmp_list);
1026 session->s_num_cap_releases = 0;
1027 spin_unlock(&session->s_cap_lock);
2f2dc053 1028
745a8e3b
YZ		 1029 dout("cleanup_cap_releases mds%d\n", session->s_mds);
1030 while (!list_empty(&tmp_list)) {
1031 struct ceph_cap *cap;
1032 /* zero out the in-progress message */
1033 cap = list_first_entry(&tmp_list,
1034 struct ceph_cap, session_caps);
1035 list_del(&cap->session_caps);
1036 ceph_put_cap(mdsc, cap);
2f2dc053 1037 }
2f2dc053
SW		 1038}
1039
1c841a96
YZ		 1040static void cleanup_session_requests(struct ceph_mds_client *mdsc,
1041 struct ceph_mds_session *session)
1042{
1043 struct ceph_mds_request *req;
1044 struct rb_node *p;
1045
1046 dout("cleanup_session_requests mds%d\n", session->s_mds);
1047 mutex_lock(&mdsc->mutex);
1048 while (!list_empty(&session->s_unsafe)) {
1049 req = list_first_entry(&session->s_unsafe,
1050 struct ceph_mds_request, r_unsafe_item);
1051 list_del_init(&req->r_unsafe_item);
3e0708b9
YZ		 1052 pr_warn_ratelimited(" dropping unsafe request %llu\n",
1053 req->r_tid);
1c841a96
YZ		 1054 __unregister_request(mdsc, req);
1055 }
1056 /* zero r_attempts, so kick_requests() will re-send requests */
1057 p = rb_first(&mdsc->request_tree);
1058 while (p) {
1059 req = rb_entry(p, struct ceph_mds_request, r_node);
1060 p = rb_next(p);
1061 if (req->r_session &&
1062 req->r_session->s_mds == session->s_mds)
1063 req->r_attempts = 0;
1064 }
1065 mutex_unlock(&mdsc->mutex);
1066}
1067
2f2dc053 1068/*
f818a736
SW		 1069 * Helper to safely iterate over all caps associated with a session, with
1070 * special care taken to handle a racing __ceph_remove_cap().
2f2dc053 1071 *
f818a736 1072 * Caller must hold session s_mutex.
2f2dc053
SW		 1073 */
1074static int iterate_session_caps(struct ceph_mds_session *session,
1075 int (*cb)(struct inode *, struct ceph_cap *,
1076 void *), void *arg)
1077{
7c1332b8
SW		 1078 struct list_head *p;
1079 struct ceph_cap *cap;
1080 struct inode *inode, *last_inode = NULL;
1081 struct ceph_cap *old_cap = NULL;
2f2dc053
SW		 1082 int ret;
1083
1084 dout("iterate_session_caps %p mds%d\n", session, session->s_mds);
1085 spin_lock(&session->s_cap_lock);
7c1332b8
SW		 1086 p = session->s_caps.next;
1087 while (p != &session->s_caps) {
1088 cap = list_entry(p, struct ceph_cap, session_caps);
2f2dc053 1089 inode = igrab(&cap->ci->vfs_inode);
7c1332b8
SW		 1090 if (!inode) {
1091 p = p->next;
2f2dc053 1092 continue;
7c1332b8
SW		 1093 }
1094 session->s_cap_iterator = cap;
2f2dc053 1095 spin_unlock(&session->s_cap_lock);
7c1332b8
SW		 1096
1097 if (last_inode) {
1098 iput(last_inode);
1099 last_inode = NULL;
1100 }
1101 if (old_cap) {
37151668 1102 ceph_put_cap(session->s_mdsc, old_cap);
7c1332b8
SW		 1103 old_cap = NULL;
1104 }
1105
2f2dc053 1106 ret = cb(inode, cap, arg);
7c1332b8
SW		 1107 last_inode = inode;
1108
2f2dc053 1109 spin_lock(&session->s_cap_lock);
7c1332b8
SW		 1110 p = p->next;
1111 if (cap->ci == NULL) {
1112 dout("iterate_session_caps finishing cap %p removal\n",
1113 cap);
1114 BUG_ON(cap->session != session);
745a8e3b 1115 cap->session = NULL;
7c1332b8
SW		 1116 list_del_init(&cap->session_caps);
1117 session->s_nr_caps--;
745a8e3b
YZ		 1118 if (cap->queue_release) {
1119 list_add_tail(&cap->session_caps,
1120 &session->s_cap_releases);
1121 session->s_num_cap_releases++;
1122 } else {
1123 old_cap = cap; /* put_cap it w/o locks held */
1124 }
7c1332b8 1125 }
5dacf091
SW		 1126 if (ret < 0)
1127 goto out;
2f2dc053 1128 }
5dacf091
SW		 1129 ret = 0;
1130out:
7c1332b8 1131 session->s_cap_iterator = NULL;
2f2dc053 1132 spin_unlock(&session->s_cap_lock);
7c1332b8 1133
e96a650a 1134 iput(last_inode);
7c1332b8 1135 if (old_cap)
37151668 1136 ceph_put_cap(session->s_mdsc, old_cap);
7c1332b8 1137
5dacf091 1138 return ret;
2f2dc053
SW		 1139}
1140
1141static int remove_session_caps_cb(struct inode *inode, struct ceph_cap *cap,
6c99f254 1142 void *arg)
2f2dc053
SW		 1143{
1144 struct ceph_inode_info *ci = ceph_inode(inode);
553adfd9 1145 LIST_HEAD(to_remove);
6c99f254
SW		 1146 int drop = 0;
1147
2f2dc053
SW		 1148 dout("removing cap %p, ci is %p, inode is %p\n",
1149 cap, ci, &ci->vfs_inode);
be655596 1150 spin_lock(&ci->i_ceph_lock);
a096b09a 1151 __ceph_remove_cap(cap, false);
571ade33 1152 if (!ci->i_auth_cap) {
553adfd9 1153 struct ceph_cap_flush *cf;
6c99f254 1154 struct ceph_mds_client *mdsc =
3d14c5d2 1155 ceph_sb_to_client(inode->i_sb)->mdsc;
6c99f254 1156
553adfd9
YZ		 1157 while (true) {
1158 struct rb_node *n = rb_first(&ci->i_cap_flush_tree);
1159 if (!n)
1160 break;
1161 cf = rb_entry(n, struct ceph_cap_flush, i_node);
1162 rb_erase(&cf->i_node, &ci->i_cap_flush_tree);
1163 list_add(&cf->list, &to_remove);
1164 }
1165
6c99f254 1166 spin_lock(&mdsc->cap_dirty_lock);
8310b089
YZ		 1167
1168 list_for_each_entry(cf, &to_remove, list)
1169 rb_erase(&cf->g_node, &mdsc->cap_flush_tree);
1170
6c99f254 1171 if (!list_empty(&ci->i_dirty_item)) {
3e0708b9
YZ		 1172 pr_warn_ratelimited(
1173 " dropping dirty %s state for %p %lld\n",
6c99f254
SW		 1174 ceph_cap_string(ci->i_dirty_caps),
1175 inode, ceph_ino(inode));
1176 ci->i_dirty_caps = 0;
1177 list_del_init(&ci->i_dirty_item);
1178 drop = 1;
1179 }
1180 if (!list_empty(&ci->i_flushing_item)) {
3e0708b9
YZ		 1181 pr_warn_ratelimited(
1182 " dropping dirty+flushing %s state for %p %lld\n",
6c99f254
SW		 1183 ceph_cap_string(ci->i_flushing_caps),
1184 inode, ceph_ino(inode));
1185 ci->i_flushing_caps = 0;
1186 list_del_init(&ci->i_flushing_item);
1187 mdsc->num_cap_flushing--;
1188 drop = 1;
1189 }
6c99f254 1190 spin_unlock(&mdsc->cap_dirty_lock);
553adfd9 1191
6c99f254 1192 }
be655596 1193 spin_unlock(&ci->i_ceph_lock);
553adfd9
YZ		 1194 while (!list_empty(&to_remove)) {
1195 struct ceph_cap_flush *cf;
1196 cf = list_first_entry(&to_remove,
1197 struct ceph_cap_flush, list);
1198 list_del(&cf->list);
1199 kfree(cf);
1200 }
6c99f254
SW		 1201 while (drop--)
1202 iput(inode);
2f2dc053
SW		 1203 return 0;
1204}
1205
1206/*
1207 * caller must hold session s_mutex
1208 */
1209static void remove_session_caps(struct ceph_mds_session *session)
1210{
1211 dout("remove_session_caps on %p\n", session);
1212 iterate_session_caps(session, remove_session_caps_cb, NULL);
6f60f889
YZ		 1213
1214 spin_lock(&session->s_cap_lock);
1215 if (session->s_nr_caps > 0) {
1216 struct super_block *sb = session->s_mdsc->fsc->sb;
1217 struct inode *inode;
1218 struct ceph_cap *cap, *prev = NULL;
1219 struct ceph_vino vino;
1220 /*
1221 * iterate_session_caps() skips inodes that are being
1222 * deleted, we need to wait until deletions are complete.
1223 * __wait_on_freeing_inode() is designed for the job,
1224 * but it is not exported, so use lookup inode function
1225 * to access it.
1226 */
1227 while (!list_empty(&session->s_caps)) {
1228 cap = list_entry(session->s_caps.next,
1229 struct ceph_cap, session_caps);
1230 if (cap == prev)
1231 break;
1232 prev = cap;
1233 vino = cap->ci->i_vino;
1234 spin_unlock(&session->s_cap_lock);
1235
ed284c49 1236 inode = ceph_find_inode(sb, vino);
6f60f889
YZ		 1237 iput(inode);
1238
1239 spin_lock(&session->s_cap_lock);
1240 }
1241 }
745a8e3b
YZ		 1242
1243 // drop cap expires and unlock s_cap_lock
1244 cleanup_cap_releases(session->s_mdsc, session);
6f60f889 1245
2f2dc053 1246 BUG_ON(session->s_nr_caps > 0);
6c99f254 1247 BUG_ON(!list_empty(&session->s_cap_flushing));
2f2dc053
SW		 1248}
1249
1250/*
1251 * wake up any threads waiting on this session's caps. if the cap is
1252 * old (didn't get renewed on the client reconnect), remove it now.
1253 *
1254 * caller must hold s_mutex.
1255 */
1256static int wake_up_session_cb(struct inode *inode, struct ceph_cap *cap,
1257 void *arg)
1258{
0dc2570f
SW		 1259 struct ceph_inode_info *ci = ceph_inode(inode);
1260
03066f23 1261 wake_up_all(&ci->i_cap_wq);
0dc2570f 1262 if (arg) {
be655596 1263 spin_lock(&ci->i_ceph_lock);
0dc2570f
SW		 1264 ci->i_wanted_max_size = 0;
1265 ci->i_requested_max_size = 0;
be655596 1266 spin_unlock(&ci->i_ceph_lock);
0dc2570f 1267 }
2f2dc053
SW		 1268 return 0;
1269}
1270
0dc2570f
SW		 1271static void wake_up_session_caps(struct ceph_mds_session *session,
1272 int reconnect)
2f2dc053
SW		 1273{
1274 dout("wake_up_session_caps %p mds%d\n", session, session->s_mds);
0dc2570f
SW		 1275 iterate_session_caps(session, wake_up_session_cb,
1276 (void *)(unsigned long)reconnect);
2f2dc053
SW		 1277}
1278
1279/*
1280 * Send periodic message to MDS renewing all currently held caps. The
1281 * ack will reset the expiration for all caps from this session.
1282 *
1283 * caller holds s_mutex
1284 */
1285static int send_renew_caps(struct ceph_mds_client *mdsc,
1286 struct ceph_mds_session *session)
1287{
1288 struct ceph_msg *msg;
1289 int state;
1290
1291 if (time_after_eq(jiffies, session->s_cap_ttl) &&
1292 time_after_eq(session->s_cap_ttl, session->s_renew_requested))
1293 pr_info("mds%d caps stale\n", session->s_mds);
e4cb4cb8 1294 session->s_renew_requested = jiffies;
2f2dc053
SW		 1295
1296 /* do not try to renew caps until a recovering mds has reconnected
1297 * with its clients. */
1298 state = ceph_mdsmap_get_state(mdsc->mdsmap, session->s_mds);
1299 if (state < CEPH_MDS_STATE_RECONNECT) {
1300 dout("send_renew_caps ignoring mds%d (%s)\n",
1301 session->s_mds, ceph_mds_state_name(state));
1302 return 0;
1303 }
1304
1305 dout("send_renew_caps to mds%d (%s)\n", session->s_mds,
1306 ceph_mds_state_name(state));
2f2dc053
SW		 1307 msg = create_session_msg(CEPH_SESSION_REQUEST_RENEWCAPS,
1308 ++session->s_renew_seq);
a79832f2
SW		 1309 if (!msg)
1310 return -ENOMEM;
2f2dc053
SW		 1311 ceph_con_send(&session->s_con, msg);
1312 return 0;
1313}
1314
186e4f7a
YZ		 1315static int send_flushmsg_ack(struct ceph_mds_client *mdsc,
1316 struct ceph_mds_session *session, u64 seq)
1317{
1318 struct ceph_msg *msg;
1319
1320 dout("send_flushmsg_ack to mds%d (%s)s seq %lld\n",
a687ecaf 1321 session->s_mds, ceph_session_state_name(session->s_state), seq);
186e4f7a
YZ		 1322 msg = create_session_msg(CEPH_SESSION_FLUSHMSG_ACK, seq);
1323 if (!msg)
1324 return -ENOMEM;
1325 ceph_con_send(&session->s_con, msg);
1326 return 0;
1327}
1328
1329
2f2dc053
SW		 1330/*
1331 * Note new cap ttl, and any transition from stale -> not stale (fresh?).
0dc2570f
SW		 1332 *
1333 * Called under session->s_mutex
2f2dc053
SW		 1334 */
1335static void renewed_caps(struct ceph_mds_client *mdsc,
1336 struct ceph_mds_session *session, int is_renew)
1337{
1338 int was_stale;
1339 int wake = 0;
1340
1341 spin_lock(&session->s_cap_lock);
1ce208a6 1342 was_stale = is_renew && time_after_eq(jiffies, session->s_cap_ttl);
2f2dc053
SW		 1343
1344 session->s_cap_ttl = session->s_renew_requested +
1345 mdsc->mdsmap->m_session_timeout*HZ;
1346
1347 if (was_stale) {
1348 if (time_before(jiffies, session->s_cap_ttl)) {
1349 pr_info("mds%d caps renewed\n", session->s_mds);
1350 wake = 1;
1351 } else {
1352 pr_info("mds%d caps still stale\n", session->s_mds);
1353 }
1354 }
1355 dout("renewed_caps mds%d ttl now %lu, was %s, now %s\n",
1356 session->s_mds, session->s_cap_ttl, was_stale ? "stale" : "fresh",
1357 time_before(jiffies, session->s_cap_ttl) ? "stale" : "fresh");
1358 spin_unlock(&session->s_cap_lock);
1359
1360 if (wake)
0dc2570f 1361 wake_up_session_caps(session, 0);
2f2dc053
SW		 1362}
1363
1364/*
1365 * send a session close request
1366 */
1367static int request_close_session(struct ceph_mds_client *mdsc,
1368 struct ceph_mds_session *session)
1369{
1370 struct ceph_msg *msg;
2f2dc053
SW		 1371
1372 dout("request_close_session mds%d state %s seq %lld\n",
a687ecaf 1373 session->s_mds, ceph_session_state_name(session->s_state),
2f2dc053
SW		 1374 session->s_seq);
1375 msg = create_session_msg(CEPH_SESSION_REQUEST_CLOSE, session->s_seq);
a79832f2
SW		 1376 if (!msg)
1377 return -ENOMEM;
1378 ceph_con_send(&session->s_con, msg);
1379 return 0;
2f2dc053
SW		 1380}
1381
1382/*
1383 * Called with s_mutex held.
1384 */
1385static int __close_session(struct ceph_mds_client *mdsc,
1386 struct ceph_mds_session *session)
1387{
1388 if (session->s_state >= CEPH_MDS_SESSION_CLOSING)
1389 return 0;
1390 session->s_state = CEPH_MDS_SESSION_CLOSING;
1391 return request_close_session(mdsc, session);
1392}
1393
1394/*
1395 * Trim old(er) caps.
1396 *
1397 * Because we can't cache an inode without one or more caps, we do
1398 * this indirectly: if a cap is unused, we prune its aliases, at which
1399 * point the inode will hopefully get dropped to.
1400 *
1401 * Yes, this is a bit sloppy. Our only real goal here is to respond to
1402 * memory pressure from the MDS, though, so it needn't be perfect.
1403 */
1404static int trim_caps_cb(struct inode *inode, struct ceph_cap *cap, void *arg)
1405{
1406 struct ceph_mds_session *session = arg;
1407 struct ceph_inode_info *ci = ceph_inode(inode);
979abfdd 1408 int used, wanted, oissued, mine;
2f2dc053
SW		 1409
1410 if (session->s_trim_caps <= 0)
1411 return -1;
1412
be655596 1413 spin_lock(&ci->i_ceph_lock);
2f2dc053
SW		 1414 mine = cap->issued | cap->implemented;
1415 used = __ceph_caps_used(ci);
979abfdd 1416 wanted = __ceph_caps_file_wanted(ci);
2f2dc053
SW		 1417 oissued = __ceph_caps_issued_other(ci, cap);
1418
979abfdd 1419 dout("trim_caps_cb %p cap %p mine %s oissued %s used %s wanted %s\n",
2f2dc053 1420 inode, cap, ceph_cap_string(mine), ceph_cap_string(oissued),
979abfdd
YZ		 1421 ceph_cap_string(used), ceph_cap_string(wanted));
1422 if (cap == ci->i_auth_cap) {
622f3e25
YZ		 1423 if (ci->i_dirty_caps || ci->i_flushing_caps ||
1424 !list_empty(&ci->i_cap_snaps))
979abfdd
YZ		 1425 goto out;
1426 if ((used | wanted) & CEPH_CAP_ANY_WR)
1427 goto out;
1428 }
1429 if ((used | wanted) & ~oissued & mine)
2f2dc053
SW		 1430 goto out; /* we need these caps */
1431
1432 session->s_trim_caps--;
1433 if (oissued) {
1434 /* we aren't the only cap.. just remove us */
a096b09a 1435 __ceph_remove_cap(cap, true);
2f2dc053
SW		 1436 } else {
1437 /* try to drop referring dentries */
be655596 1438 spin_unlock(&ci->i_ceph_lock);
2f2dc053
SW		 1439 d_prune_aliases(inode);
1440 dout("trim_caps_cb %p cap %p pruned, count now %d\n",
1441 inode, cap, atomic_read(&inode->i_count));
1442 return 0;
1443 }
1444
1445out:
be655596 1446 spin_unlock(&ci->i_ceph_lock);
2f2dc053
SW		 1447 return 0;
1448}
1449
1450/*
1451 * Trim session cap count down to some max number.
1452 */
1453static int trim_caps(struct ceph_mds_client *mdsc,
1454 struct ceph_mds_session *session,
1455 int max_caps)
1456{
1457 int trim_caps = session->s_nr_caps - max_caps;
1458
1459 dout("trim_caps mds%d start: %d / %d, trim %d\n",
1460 session->s_mds, session->s_nr_caps, max_caps, trim_caps);
1461 if (trim_caps > 0) {
1462 session->s_trim_caps = trim_caps;
1463 iterate_session_caps(session, trim_caps_cb, session);
1464 dout("trim_caps mds%d done: %d / %d, trimmed %d\n",
1465 session->s_mds, session->s_nr_caps, max_caps,
1466 trim_caps - session->s_trim_caps);
5dacf091 1467 session->s_trim_caps = 0;
2f2dc053 1468 }
a56371d9 1469
a56371d9 1470 ceph_send_cap_releases(mdsc, session);
2f2dc053
SW		 1471 return 0;
1472}
1473
8310b089
YZ		 1474static int check_capsnap_flush(struct ceph_inode_info *ci,
1475 u64 want_snap_seq)
d3383a8e 1476{
8310b089 1477 int ret = 1;
d3383a8e 1478 spin_lock(&ci->i_ceph_lock);
affbc19a
YZ		 1479 if (want_snap_seq > 0 && !list_empty(&ci->i_cap_snaps)) {
1480 struct ceph_cap_snap *capsnap =
1481 list_first_entry(&ci->i_cap_snaps,
1482 struct ceph_cap_snap, ci_item);
8310b089 1483 ret = capsnap->follows >= want_snap_seq;
affbc19a 1484 }
d3383a8e 1485 spin_unlock(&ci->i_ceph_lock);
8310b089
YZ		 1486 return ret;
1487}
1488
1489static int check_caps_flush(struct ceph_mds_client *mdsc,
1490 u64 want_flush_tid)
1491{
1492 struct rb_node *n;
1493 struct ceph_cap_flush *cf;
1494 int ret = 1;
1495
1496 spin_lock(&mdsc->cap_dirty_lock);
1497 n = rb_first(&mdsc->cap_flush_tree);
1498 cf = n ? rb_entry(n, struct ceph_cap_flush, g_node) : NULL;
1499 if (cf && cf->tid <= want_flush_tid) {
1500 dout("check_caps_flush still flushing tid %llu <= %llu\n",
1501 cf->tid, want_flush_tid);
1502 ret = 0;
1503 }
1504 spin_unlock(&mdsc->cap_dirty_lock);
1505 return ret;
d3383a8e
YZ		 1506}
1507
2f2dc053
SW		 1508/*
1509 * flush all dirty inode data to disk.
1510 *
8310b089 1511 * returns true if we've flushed through want_flush_tid
2f2dc053 1512 */
affbc19a 1513static void wait_caps_flush(struct ceph_mds_client *mdsc,
8310b089 1514 u64 want_flush_tid, u64 want_snap_seq)
2f2dc053 1515{
d3383a8e 1516 int mds;
2f2dc053 1517
8310b089
YZ		 1518 dout("check_caps_flush want %llu snap want %llu\n",
1519 want_flush_tid, want_snap_seq);
2f2dc053 1520 mutex_lock(&mdsc->mutex);
affbc19a 1521 for (mds = 0; mds < mdsc->max_sessions; ) {
2f2dc053 1522 struct ceph_mds_session *session = mdsc->sessions[mds];
8310b089 1523 struct inode *inode = NULL;
2f2dc053 1524
affbc19a
YZ		 1525 if (!session) {
1526 mds++;
2f2dc053 1527 continue;
affbc19a 1528 }
2f2dc053
SW		 1529 get_session(session);
1530 mutex_unlock(&mdsc->mutex);
1531
1532 mutex_lock(&session->s_mutex);
affbc19a
YZ		 1533 if (!list_empty(&session->s_cap_snaps_flushing)) {
1534 struct ceph_cap_snap *capsnap =
1535 list_first_entry(&session->s_cap_snaps_flushing,
1536 struct ceph_cap_snap,
1537 flushing_item);
1538 struct ceph_inode_info *ci = capsnap->ci;
8310b089 1539 if (!check_capsnap_flush(ci, want_snap_seq)) {
affbc19a
YZ		 1540 dout("check_cap_flush still flushing snap %p "
1541 "follows %lld <= %lld to mds%d\n",
1542 &ci->vfs_inode, capsnap->follows,
1543 want_snap_seq, mds);
8310b089 1544 inode = igrab(&ci->vfs_inode);
2f2dc053 1545 }
2f2dc053
SW		 1546 }
1547 mutex_unlock(&session->s_mutex);
1548 ceph_put_mds_session(session);
1549
8310b089 1550 if (inode) {
affbc19a 1551 wait_event(mdsc->cap_flushing_wq,
8310b089
YZ		 1552 check_capsnap_flush(ceph_inode(inode),
1553 want_snap_seq));
1554 iput(inode);
1555 } else {
affbc19a 1556 mds++;
8310b089 1557 }
affbc19a 1558
2f2dc053
SW		 1559 mutex_lock(&mdsc->mutex);
1560 }
2f2dc053 1561 mutex_unlock(&mdsc->mutex);
8310b089
YZ		 1562
1563 wait_event(mdsc->cap_flushing_wq,
1564 check_caps_flush(mdsc, want_flush_tid));
1565
1566 dout("check_caps_flush ok, flushed thru %llu\n", want_flush_tid);
2f2dc053
SW		 1567}
1568
1569/*
1570 * called under s_mutex
1571 */
3d7ded4d
SW		 1572void ceph_send_cap_releases(struct ceph_mds_client *mdsc,
1573 struct ceph_mds_session *session)
2f2dc053 1574{
745a8e3b
YZ		 1575 struct ceph_msg *msg = NULL;
1576 struct ceph_mds_cap_release *head;
1577 struct ceph_mds_cap_item *item;
1578 struct ceph_cap *cap;
1579 LIST_HEAD(tmp_list);
1580 int num_cap_releases;
2f2dc053 1581
0f8605f2 1582 spin_lock(&session->s_cap_lock);
745a8e3b
YZ		 1583again:
1584 list_splice_init(&session->s_cap_releases, &tmp_list);
1585 num_cap_releases = session->s_num_cap_releases;
1586 session->s_num_cap_releases = 0;
2f2dc053 1587 spin_unlock(&session->s_cap_lock);
e01a5946 1588
745a8e3b
YZ		 1589 while (!list_empty(&tmp_list)) {
1590 if (!msg) {
1591 msg = ceph_msg_new(CEPH_MSG_CLIENT_CAPRELEASE,
1592 PAGE_CACHE_SIZE, GFP_NOFS, false);
1593 if (!msg)
1594 goto out_err;
1595 head = msg->front.iov_base;
1596 head->num = cpu_to_le32(0);
1597 msg->front.iov_len = sizeof(*head);
1598 }
1599 cap = list_first_entry(&tmp_list, struct ceph_cap,
1600 session_caps);
1601 list_del(&cap->session_caps);
1602 num_cap_releases--;
e01a5946 1603
00bd8edb 1604 head = msg->front.iov_base;
745a8e3b
YZ		 1605 le32_add_cpu(&head->num, 1);
1606 item = msg->front.iov_base + msg->front.iov_len;
1607 item->ino = cpu_to_le64(cap->cap_ino);
1608 item->cap_id = cpu_to_le64(cap->cap_id);
1609 item->migrate_seq = cpu_to_le32(cap->mseq);
1610 item->seq = cpu_to_le32(cap->issue_seq);
1611 msg->front.iov_len += sizeof(*item);
1612
1613 ceph_put_cap(mdsc, cap);
1614
1615 if (le32_to_cpu(head->num) == CEPH_CAPS_PER_RELEASE) {
1616 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
1617 dout("send_cap_releases mds%d %p\n", session->s_mds, msg);
1618 ceph_con_send(&session->s_con, msg);
1619 msg = NULL;
1620 }
00bd8edb 1621 }
e01a5946 1622
745a8e3b 1623 BUG_ON(num_cap_releases != 0);
e01a5946 1624
745a8e3b
YZ		 1625 spin_lock(&session->s_cap_lock);
1626 if (!list_empty(&session->s_cap_releases))
1627 goto again;
1628 spin_unlock(&session->s_cap_lock);
1629
1630 if (msg) {
1631 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
1632 dout("send_cap_releases mds%d %p\n", session->s_mds, msg);
1633 ceph_con_send(&session->s_con, msg);
e01a5946 1634 }
745a8e3b
YZ		 1635 return;
1636out_err:
1637 pr_err("send_cap_releases mds%d, failed to allocate message\n",
1638 session->s_mds);
1639 spin_lock(&session->s_cap_lock);
1640 list_splice(&tmp_list, &session->s_cap_releases);
1641 session->s_num_cap_releases += num_cap_releases;
1642 spin_unlock(&session->s_cap_lock);
e01a5946
SW		 1643}
1644
2f2dc053
SW		 1645/*
1646 * requests
1647 */
1648
54008399
YZ		 1649int ceph_alloc_readdir_reply_buffer(struct ceph_mds_request *req,
1650 struct inode *dir)
1651{
1652 struct ceph_inode_info *ci = ceph_inode(dir);
1653 struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1654 struct ceph_mount_options *opt = req->r_mdsc->fsc->mount_options;
1655 size_t size = sizeof(*rinfo->dir_in) + sizeof(*rinfo->dir_dname_len) +
1656 sizeof(*rinfo->dir_dname) + sizeof(*rinfo->dir_dlease);
1657 int order, num_entries;
1658
1659 spin_lock(&ci->i_ceph_lock);
1660 num_entries = ci->i_files + ci->i_subdirs;
1661 spin_unlock(&ci->i_ceph_lock);
1662 num_entries = max(num_entries, 1);
1663 num_entries = min(num_entries, opt->max_readdir);
1664
1665 order = get_order(size * num_entries);
1666 while (order >= 0) {
1667 rinfo->dir_in = (void*)__get_free_pages(GFP_NOFS | __GFP_NOWARN,
1668 order);
1669 if (rinfo->dir_in)
1670 break;
1671 order--;
1672 }
1673 if (!rinfo->dir_in)
1674 return -ENOMEM;
1675
1676 num_entries = (PAGE_SIZE << order) / size;
1677 num_entries = min(num_entries, opt->max_readdir);
1678
1679 rinfo->dir_buf_size = PAGE_SIZE << order;
1680 req->r_num_caps = num_entries + 1;
1681 req->r_args.readdir.max_entries = cpu_to_le32(num_entries);
1682 req->r_args.readdir.max_bytes = cpu_to_le32(opt->max_readdir_bytes);
1683 return 0;
1684}
1685
2f2dc053
SW		 1686/*
1687 * Create an mds request.
1688 */
1689struct ceph_mds_request *
1690ceph_mdsc_create_request(struct ceph_mds_client *mdsc, int op, int mode)
1691{
1692 struct ceph_mds_request *req = kzalloc(sizeof(*req), GFP_NOFS);
1693
1694 if (!req)
1695 return ERR_PTR(-ENOMEM);
1696
b4556396 1697 mutex_init(&req->r_fill_mutex);
37151668 1698 req->r_mdsc = mdsc;
2f2dc053
SW		 1699 req->r_started = jiffies;
1700 req->r_resend_mds = -1;
1701 INIT_LIST_HEAD(&req->r_unsafe_dir_item);
1702 req->r_fmode = -1;
153c8e6b 1703 kref_init(&req->r_kref);
2f2dc053
SW		 1704 INIT_LIST_HEAD(&req->r_wait);
1705 init_completion(&req->r_completion);
1706 init_completion(&req->r_safe_completion);
1707 INIT_LIST_HEAD(&req->r_unsafe_item);
1708
b8e69066
SW		 1709 req->r_stamp = CURRENT_TIME;
1710
2f2dc053
SW		 1711 req->r_op = op;
1712 req->r_direct_mode = mode;
1713 return req;
1714}
1715
1716/*
44ca18f2 1717 * return oldest (lowest) request, tid in request tree, 0 if none.
2f2dc053
SW		 1718 *
1719 * called under mdsc->mutex.
1720 */
44ca18f2
SW		 1721static struct ceph_mds_request *__get_oldest_req(struct ceph_mds_client *mdsc)
1722{
1723 if (RB_EMPTY_ROOT(&mdsc->request_tree))
1724 return NULL;
1725 return rb_entry(rb_first(&mdsc->request_tree),
1726 struct ceph_mds_request, r_node);
1727}
1728
e8a7b8b1 1729static inline u64 __get_oldest_tid(struct ceph_mds_client *mdsc)
2f2dc053 1730{
e8a7b8b1 1731 return mdsc->oldest_tid;
2f2dc053
SW		 1732}
1733
1734/*
1735 * Build a dentry's path. Allocate on heap; caller must kfree. Based
1736 * on build_path_from_dentry in fs/cifs/dir.c.
1737 *
1738 * If @stop_on_nosnap, generate path relative to the first non-snapped
1739 * inode.
1740 *
1741 * Encode hidden .snap dirs as a double /, i.e.
1742 * foo/.snap/bar -> foo//bar
1743 */
1744char *ceph_mdsc_build_path(struct dentry *dentry, int *plen, u64 *base,
1745 int stop_on_nosnap)
1746{
1747 struct dentry *temp;
1748 char *path;
1749 int len, pos;
1b71fe2e 1750 unsigned seq;
2f2dc053
SW		 1751
1752 if (dentry == NULL)
1753 return ERR_PTR(-EINVAL);
1754
1755retry:
1756 len = 0;
1b71fe2e
AV		 1757 seq = read_seqbegin(&rename_lock);
1758 rcu_read_lock();
2f2dc053 1759 for (temp = dentry; !IS_ROOT(temp);) {
2b0143b5 1760 struct inode *inode = d_inode(temp);
2f2dc053
SW		 1761 if (inode && ceph_snap(inode) == CEPH_SNAPDIR)
1762 len++; /* slash only */
1763 else if (stop_on_nosnap && inode &&
1764 ceph_snap(inode) == CEPH_NOSNAP)
1765 break;
1766 else
1767 len += 1 + temp->d_name.len;
1768 temp = temp->d_parent;
2f2dc053 1769 }
1b71fe2e 1770 rcu_read_unlock();
2f2dc053
SW		 1771 if (len)
1772 len--; /* no leading '/' */
1773
1774 path = kmalloc(len+1, GFP_NOFS);
1775 if (path == NULL)
1776 return ERR_PTR(-ENOMEM);
1777 pos = len;
1778 path[pos] = 0; /* trailing null */
1b71fe2e 1779 rcu_read_lock();
2f2dc053 1780 for (temp = dentry; !IS_ROOT(temp) && pos != 0; ) {
1b71fe2e 1781 struct inode *inode;
2f2dc053 1782
1b71fe2e 1783 spin_lock(&temp->d_lock);
2b0143b5 1784 inode = d_inode(temp);
2f2dc053 1785 if (inode && ceph_snap(inode) == CEPH_SNAPDIR) {
104648ad 1786 dout("build_path path+%d: %p SNAPDIR\n",
2f2dc053
SW		 1787 pos, temp);
1788 } else if (stop_on_nosnap && inode &&
1789 ceph_snap(inode) == CEPH_NOSNAP) {
9d5a09e6 1790 spin_unlock(&temp->d_lock);
2f2dc053
SW		 1791 break;
1792 } else {
1793 pos -= temp->d_name.len;
1b71fe2e
AV		 1794 if (pos < 0) {
1795 spin_unlock(&temp->d_lock);
2f2dc053 1796 break;
1b71fe2e 1797 }
2f2dc053
SW		 1798 strncpy(path + pos, temp->d_name.name,
1799 temp->d_name.len);
2f2dc053 1800 }
1b71fe2e 1801 spin_unlock(&temp->d_lock);
2f2dc053
SW		 1802 if (pos)
1803 path[--pos] = '/';
1804 temp = temp->d_parent;
2f2dc053 1805 }
1b71fe2e
AV		 1806 rcu_read_unlock();
1807 if (pos != 0 || read_seqretry(&rename_lock, seq)) {
104648ad 1808 pr_err("build_path did not end path lookup where "
2f2dc053
SW		 1809 "expected, namelen is %d, pos is %d\n", len, pos);
1810 /* presumably this is only possible if racing with a
1811 rename of one of the parent directories (we can not
1812 lock the dentries above us to prevent this, but
1813 retrying should be harmless) */
1814 kfree(path);
1815 goto retry;
1816 }
1817
2b0143b5 1818 *base = ceph_ino(d_inode(temp));
2f2dc053 1819 *plen = len;
104648ad 1820 dout("build_path on %p %d built %llx '%.*s'\n",
84d08fa8 1821 dentry, d_count(dentry), *base, len, path);
2f2dc053
SW		 1822 return path;
1823}
1824
1825static int build_dentry_path(struct dentry *dentry,
1826 const char **ppath, int *ppathlen, u64 *pino,
1827 int *pfreepath)
1828{
1829 char *path;
1830
2b0143b5
DH		 1831 if (ceph_snap(d_inode(dentry->d_parent)) == CEPH_NOSNAP) {
1832 *pino = ceph_ino(d_inode(dentry->d_parent));
2f2dc053
SW		 1833 *ppath = dentry->d_name.name;
1834 *ppathlen = dentry->d_name.len;
1835 return 0;
1836 }
1837 path = ceph_mdsc_build_path(dentry, ppathlen, pino, 1);
1838 if (IS_ERR(path))
1839 return PTR_ERR(path);
1840 *ppath = path;
1841 *pfreepath = 1;
1842 return 0;
1843}
1844
1845static int build_inode_path(struct inode *inode,
1846 const char **ppath, int *ppathlen, u64 *pino,
1847 int *pfreepath)
1848{
1849 struct dentry *dentry;
1850 char *path;
1851
1852 if (ceph_snap(inode) == CEPH_NOSNAP) {
1853 *pino = ceph_ino(inode);
1854 *ppathlen = 0;
1855 return 0;
1856 }
1857 dentry = d_find_alias(inode);
1858 path = ceph_mdsc_build_path(dentry, ppathlen, pino, 1);
1859 dput(dentry);
1860 if (IS_ERR(path))
1861 return PTR_ERR(path);
1862 *ppath = path;
1863 *pfreepath = 1;
1864 return 0;
1865}
1866
1867/*
1868 * request arguments may be specified via an inode *, a dentry *, or
1869 * an explicit ino+path.
1870 */
1871static int set_request_path_attr(struct inode *rinode, struct dentry *rdentry,
1872 const char *rpath, u64 rino,
1873 const char **ppath, int *pathlen,
1874 u64 *ino, int *freepath)
1875{
1876 int r = 0;
1877
1878 if (rinode) {
1879 r = build_inode_path(rinode, ppath, pathlen, ino, freepath);
1880 dout(" inode %p %llx.%llx\n", rinode, ceph_ino(rinode),
1881 ceph_snap(rinode));
1882 } else if (rdentry) {
1883 r = build_dentry_path(rdentry, ppath, pathlen, ino, freepath);
1884 dout(" dentry %p %llx/%.*s\n", rdentry, *ino, *pathlen,
1885 *ppath);
795858db 1886 } else if (rpath || rino) {
2f2dc053
SW		 1887 *ino = rino;
1888 *ppath = rpath;
b000056a 1889 *pathlen = rpath ? strlen(rpath) : 0;
2f2dc053
SW		 1890 dout(" path %.*s\n", *pathlen, rpath);
1891 }
1892
1893 return r;
1894}
1895
1896/*
1897 * called under mdsc->mutex
1898 */
1899static struct ceph_msg *create_request_message(struct ceph_mds_client *mdsc,
1900 struct ceph_mds_request *req,
6e6f0923 1901 int mds, bool drop_cap_releases)
2f2dc053
SW		 1902{
1903 struct ceph_msg *msg;
1904 struct ceph_mds_request_head *head;
1905 const char *path1 = NULL;
1906 const char *path2 = NULL;
1907 u64 ino1 = 0, ino2 = 0;
1908 int pathlen1 = 0, pathlen2 = 0;
1909 int freepath1 = 0, freepath2 = 0;
1910 int len;
1911 u16 releases;
1912 void *p, *end;
1913 int ret;
1914
1915 ret = set_request_path_attr(req->r_inode, req->r_dentry,
1916 req->r_path1, req->r_ino1.ino,
1917 &path1, &pathlen1, &ino1, &freepath1);
1918 if (ret < 0) {
1919 msg = ERR_PTR(ret);
1920 goto out;
1921 }
1922
1923 ret = set_request_path_attr(NULL, req->r_old_dentry,
1924 req->r_path2, req->r_ino2.ino,
1925 &path2, &pathlen2, &ino2, &freepath2);
1926 if (ret < 0) {
1927 msg = ERR_PTR(ret);
1928 goto out_free1;
1929 }
1930
1931 len = sizeof(*head) +
b8e69066
SW		 1932 pathlen1 + pathlen2 + 2*(1 + sizeof(u32) + sizeof(u64)) +
1933 sizeof(struct timespec);
2f2dc053
SW		 1934
1935 /* calculate (max) length for cap releases */
1936 len += sizeof(struct ceph_mds_request_release) *
1937 (!!req->r_inode_drop + !!req->r_dentry_drop +
1938 !!req->r_old_inode_drop + !!req->r_old_dentry_drop);
1939 if (req->r_dentry_drop)
1940 len += req->r_dentry->d_name.len;
1941 if (req->r_old_dentry_drop)
1942 len += req->r_old_dentry->d_name.len;
1943
b61c2763 1944 msg = ceph_msg_new(CEPH_MSG_CLIENT_REQUEST, len, GFP_NOFS, false);
a79832f2
SW		 1945 if (!msg) {
1946 msg = ERR_PTR(-ENOMEM);
2f2dc053 1947 goto out_free2;
a79832f2 1948 }
2f2dc053 1949
7cfa0313 1950 msg->hdr.version = cpu_to_le16(2);
6df058c0
SW		 1951 msg->hdr.tid = cpu_to_le64(req->r_tid);
1952
2f2dc053
SW		 1953 head = msg->front.iov_base;
1954 p = msg->front.iov_base + sizeof(*head);
1955 end = msg->front.iov_base + msg->front.iov_len;
1956
1957 head->mdsmap_epoch = cpu_to_le32(mdsc->mdsmap->m_epoch);
1958 head->op = cpu_to_le32(req->r_op);
ff3d0046
EB		 1959 head->caller_uid = cpu_to_le32(from_kuid(&init_user_ns, req->r_uid));
1960 head->caller_gid = cpu_to_le32(from_kgid(&init_user_ns, req->r_gid));
2f2dc053
SW		 1961 head->args = req->r_args;
1962
1963 ceph_encode_filepath(&p, end, ino1, path1);
1964 ceph_encode_filepath(&p, end, ino2, path2);
1965
e979cf50
SW		 1966 /* make note of release offset, in case we need to replay */
1967 req->r_request_release_offset = p - msg->front.iov_base;
1968
2f2dc053
SW		 1969 /* cap releases */
1970 releases = 0;
1971 if (req->r_inode_drop)
1972 releases += ceph_encode_inode_release(&p,
2b0143b5 1973 req->r_inode ? req->r_inode : d_inode(req->r_dentry),
2f2dc053
SW		 1974 mds, req->r_inode_drop, req->r_inode_unless, 0);
1975 if (req->r_dentry_drop)
1976 releases += ceph_encode_dentry_release(&p, req->r_dentry,
1977 mds, req->r_dentry_drop, req->r_dentry_unless);
1978 if (req->r_old_dentry_drop)
1979 releases += ceph_encode_dentry_release(&p, req->r_old_dentry,
1980 mds, req->r_old_dentry_drop, req->r_old_dentry_unless);
1981 if (req->r_old_inode_drop)
1982 releases += ceph_encode_inode_release(&p,
2b0143b5 1983 d_inode(req->r_old_dentry),
2f2dc053 1984 mds, req->r_old_inode_drop, req->r_old_inode_unless, 0);
6e6f0923
YZ		 1985
1986 if (drop_cap_releases) {
1987 releases = 0;
1988 p = msg->front.iov_base + req->r_request_release_offset;
1989 }
1990
2f2dc053
SW		 1991 head->num_releases = cpu_to_le16(releases);
1992
b8e69066 1993 /* time stamp */
1f041a89
YZ		 1994 {
1995 struct ceph_timespec ts;
1996 ceph_encode_timespec(&ts, &req->r_stamp);
1997 ceph_encode_copy(&p, &ts, sizeof(ts));
1998 }
b8e69066 1999
2f2dc053
SW		 2000 BUG_ON(p > end);
2001 msg->front.iov_len = p - msg->front.iov_base;
2002 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
2003
25e6bae3
YZ		 2004 if (req->r_pagelist) {
2005 struct ceph_pagelist *pagelist = req->r_pagelist;
2006 atomic_inc(&pagelist->refcnt);
2007 ceph_msg_data_add_pagelist(msg, pagelist);
2008 msg->hdr.data_len = cpu_to_le32(pagelist->length);
2009 } else {
2010 msg->hdr.data_len = 0;
ebf18f47 2011 }
02afca6c 2012
2f2dc053
SW		 2013 msg->hdr.data_off = cpu_to_le16(0);
2014
2015out_free2:
2016 if (freepath2)
2017 kfree((char *)path2);
2018out_free1:
2019 if (freepath1)
2020 kfree((char *)path1);
2021out:
2022 return msg;
2023}
2024
2025/*
2026 * called under mdsc->mutex if error, under no mutex if
2027 * success.
2028 */
2029static void complete_request(struct ceph_mds_client *mdsc,
2030 struct ceph_mds_request *req)
2031{
2032 if (req->r_callback)
2033 req->r_callback(mdsc, req);
2034 else
03066f23 2035 complete_all(&req->r_completion);
2f2dc053
SW		 2036}
2037
2038/*
2039 * called under mdsc->mutex
2040 */
2041static int __prepare_send_request(struct ceph_mds_client *mdsc,
2042 struct ceph_mds_request *req,
6e6f0923 2043 int mds, bool drop_cap_releases)
2f2dc053
SW		 2044{
2045 struct ceph_mds_request_head *rhead;
2046 struct ceph_msg *msg;
2047 int flags = 0;
2048
2f2dc053 2049 req->r_attempts++;
e55b71f8
GF		 2050 if (req->r_inode) {
2051 struct ceph_cap *cap =
2052 ceph_get_cap_for_mds(ceph_inode(req->r_inode), mds);
2053
2054 if (cap)
2055 req->r_sent_on_mseq = cap->mseq;
2056 else
2057 req->r_sent_on_mseq = -1;
2058 }
2f2dc053
SW		 2059 dout("prepare_send_request %p tid %lld %s (attempt %d)\n", req,
2060 req->r_tid, ceph_mds_op_name(req->r_op), req->r_attempts);
2061
01a92f17 2062 if (req->r_got_unsafe) {
c5c9a0bf 2063 void *p;
01a92f17
SW		 2064 /*
2065 * Replay. Do not regenerate message (and rebuild
2066 * paths, etc.); just use the original message.
2067 * Rebuilding paths will break for renames because
2068 * d_move mangles the src name.
2069 */
2070 msg = req->r_request;
2071 rhead = msg->front.iov_base;
2072
2073 flags = le32_to_cpu(rhead->flags);
2074 flags |= CEPH_MDS_FLAG_REPLAY;
2075 rhead->flags = cpu_to_le32(flags);
2076
2077 if (req->r_target_inode)
2078 rhead->ino = cpu_to_le64(ceph_ino(req->r_target_inode));
2079
2080 rhead->num_retry = req->r_attempts - 1;
e979cf50
SW		 2081
2082 /* remove cap/dentry releases from message */
2083 rhead->num_releases = 0;
c5c9a0bf
YZ		 2084
2085 /* time stamp */
2086 p = msg->front.iov_base + req->r_request_release_offset;
1f041a89
YZ		 2087 {
2088 struct ceph_timespec ts;
2089 ceph_encode_timespec(&ts, &req->r_stamp);
2090 ceph_encode_copy(&p, &ts, sizeof(ts));
2091 }
c5c9a0bf
YZ		 2092
2093 msg->front.iov_len = p - msg->front.iov_base;
2094 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
01a92f17
SW		 2095 return 0;
2096 }
2097
2f2dc053
SW		 2098 if (req->r_request) {
2099 ceph_msg_put(req->r_request);
2100 req->r_request = NULL;
2101 }
6e6f0923 2102 msg = create_request_message(mdsc, req, mds, drop_cap_releases);
2f2dc053 2103 if (IS_ERR(msg)) {
e1518c7c 2104 req->r_err = PTR_ERR(msg);
2f2dc053 2105 complete_request(mdsc, req);
a79832f2 2106 return PTR_ERR(msg);
2f2dc053
SW		 2107 }
2108 req->r_request = msg;
2109
2110 rhead = msg->front.iov_base;
2f2dc053
SW		 2111 rhead->oldest_client_tid = cpu_to_le64(__get_oldest_tid(mdsc));
2112 if (req->r_got_unsafe)
2113 flags |= CEPH_MDS_FLAG_REPLAY;
2114 if (req->r_locked_dir)
2115 flags |= CEPH_MDS_FLAG_WANT_DENTRY;
2116 rhead->flags = cpu_to_le32(flags);
2117 rhead->num_fwd = req->r_num_fwd;
2118 rhead->num_retry = req->r_attempts - 1;
01a92f17 2119 rhead->ino = 0;
2f2dc053
SW		 2120
2121 dout(" r_locked_dir = %p\n", req->r_locked_dir);
2f2dc053
SW		 2122 return 0;
2123}
2124
2125/*
2126 * send request, or put it on the appropriate wait list.
2127 */
2128static int __do_request(struct ceph_mds_client *mdsc,
2129 struct ceph_mds_request *req)
2130{
2131 struct ceph_mds_session *session = NULL;
2132 int mds = -1;
2133 int err = -EAGAIN;
2134
eb1b8af3
YZ		 2135 if (req->r_err || req->r_got_result) {
2136 if (req->r_aborted)
2137 __unregister_request(mdsc, req);
2f2dc053 2138 goto out;
eb1b8af3 2139 }
2f2dc053
SW		 2140
2141 if (req->r_timeout &&
2142 time_after_eq(jiffies, req->r_started + req->r_timeout)) {
2143 dout("do_request timed out\n");
2144 err = -EIO;
2145 goto finish;
2146 }
2147
dc69e2e9
SW		 2148 put_request_session(req);
2149
2f2dc053
SW		 2150 mds = __choose_mds(mdsc, req);
2151 if (mds < 0 ||
2152 ceph_mdsmap_get_state(mdsc->mdsmap, mds) < CEPH_MDS_STATE_ACTIVE) {
2153 dout("do_request no mds or not active, waiting for map\n");
2154 list_add(&req->r_wait, &mdsc->waiting_for_map);
2155 goto out;
2156 }
2157
2158 /* get, open session */
2159 session = __ceph_lookup_mds_session(mdsc, mds);
9c423956 2160 if (!session) {
2f2dc053 2161 session = register_session(mdsc, mds);
9c423956
SW		 2162 if (IS_ERR(session)) {
2163 err = PTR_ERR(session);
2164 goto finish;
2165 }
2166 }
dc69e2e9
SW		 2167 req->r_session = get_session(session);
2168
2f2dc053 2169 dout("do_request mds%d session %p state %s\n", mds, session,
a687ecaf 2170 ceph_session_state_name(session->s_state));
2f2dc053
SW		 2171 if (session->s_state != CEPH_MDS_SESSION_OPEN &&
2172 session->s_state != CEPH_MDS_SESSION_HUNG) {
2173 if (session->s_state == CEPH_MDS_SESSION_NEW ||
2174 session->s_state == CEPH_MDS_SESSION_CLOSING)
2175 __open_session(mdsc, session);
2176 list_add(&req->r_wait, &session->s_waiting);
2177 goto out_session;
2178 }
2179
2180 /* send request */
2f2dc053
SW		 2181 req->r_resend_mds = -1; /* forget any previous mds hint */
2182
2183 if (req->r_request_started == 0) /* note request start time */
2184 req->r_request_started = jiffies;
2185
6e6f0923 2186 err = __prepare_send_request(mdsc, req, mds, false);
2f2dc053
SW		 2187 if (!err) {
2188 ceph_msg_get(req->r_request);
2189 ceph_con_send(&session->s_con, req->r_request);
2190 }
2191
2192out_session:
2193 ceph_put_mds_session(session);
2194out:
2195 return err;
2196
2197finish:
e1518c7c 2198 req->r_err = err;
2f2dc053
SW		 2199 complete_request(mdsc, req);
2200 goto out;
2201}
2202
2203/*
2204 * called under mdsc->mutex
2205 */
2206static void __wake_requests(struct ceph_mds_client *mdsc,
2207 struct list_head *head)
2208{
ed75ec2c
YZ		 2209 struct ceph_mds_request *req;
2210 LIST_HEAD(tmp_list);
2211
2212 list_splice_init(head, &tmp_list);
2f2dc053 2213
ed75ec2c
YZ		 2214 while (!list_empty(&tmp_list)) {
2215 req = list_entry(tmp_list.next,
2216 struct ceph_mds_request, r_wait);
2f2dc053 2217 list_del_init(&req->r_wait);
7971bd92 2218 dout(" wake request %p tid %llu\n", req, req->r_tid);
2f2dc053
SW		 2219 __do_request(mdsc, req);
2220 }
2221}
2222
2223/*
2224 * Wake up threads with requests pending for @mds, so that they can
29790f26 2225 * resubmit their requests to a possibly different mds.
2f2dc053 2226 */
29790f26 2227static void kick_requests(struct ceph_mds_client *mdsc, int mds)
2f2dc053 2228{
44ca18f2 2229 struct ceph_mds_request *req;
282c1052 2230 struct rb_node *p = rb_first(&mdsc->request_tree);
2f2dc053
SW		 2231
2232 dout("kick_requests mds%d\n", mds);
282c1052 2233 while (p) {
44ca18f2 2234 req = rb_entry(p, struct ceph_mds_request, r_node);
282c1052 2235 p = rb_next(p);
44ca18f2
SW		 2236 if (req->r_got_unsafe)
2237 continue;
3de22be6
YZ		 2238 if (req->r_attempts > 0)
2239 continue; /* only new requests */
44ca18f2
SW		 2240 if (req->r_session &&
2241 req->r_session->s_mds == mds) {
2242 dout(" kicking tid %llu\n", req->r_tid);
03974e81 2243 list_del_init(&req->r_wait);
44ca18f2 2244 __do_request(mdsc, req);
2f2dc053
SW		 2245 }
2246 }
2247}
2248
2249void ceph_mdsc_submit_request(struct ceph_mds_client *mdsc,
2250 struct ceph_mds_request *req)
2251{
2252 dout("submit_request on %p\n", req);
2253 mutex_lock(&mdsc->mutex);
2254 __register_request(mdsc, req, NULL);
2255 __do_request(mdsc, req);
2256 mutex_unlock(&mdsc->mutex);
2257}
2258
2259/*
2260 * Synchrously perform an mds request. Take care of all of the
2261 * session setup, forwarding, retry details.
2262 */
2263int ceph_mdsc_do_request(struct ceph_mds_client *mdsc,
2264 struct inode *dir,
2265 struct ceph_mds_request *req)
2266{
2267 int err;
2268
2269 dout("do_request on %p\n", req);
2270
2271 /* take CAP_PIN refs for r_inode, r_locked_dir, r_old_dentry */
2272 if (req->r_inode)
2273 ceph_get_cap_refs(ceph_inode(req->r_inode), CEPH_CAP_PIN);
2274 if (req->r_locked_dir)
2275 ceph_get_cap_refs(ceph_inode(req->r_locked_dir), CEPH_CAP_PIN);
844d87c3 2276 if (req->r_old_dentry_dir)
41b02e1f
SW		 2277 ceph_get_cap_refs(ceph_inode(req->r_old_dentry_dir),
2278 CEPH_CAP_PIN);
2f2dc053
SW		 2279
2280 /* issue */
2281 mutex_lock(&mdsc->mutex);
2282 __register_request(mdsc, req, dir);
2283 __do_request(mdsc, req);
2284
e1518c7c
SW		 2285 if (req->r_err) {
2286 err = req->r_err;
2287 __unregister_request(mdsc, req);
2288 dout("do_request early error %d\n", err);
2289 goto out;
2f2dc053
SW		 2290 }
2291
e1518c7c
SW		 2292 /* wait */
2293 mutex_unlock(&mdsc->mutex);
2294 dout("do_request waiting\n");
5be73034 2295 if (!req->r_timeout && req->r_wait_for_completion) {
9280be24 2296 err = req->r_wait_for_completion(mdsc, req);
e1518c7c 2297 } else {
5be73034
ID		 2298 long timeleft = wait_for_completion_killable_timeout(
2299 &req->r_completion,
2300 ceph_timeout_jiffies(req->r_timeout));
2301 if (timeleft > 0)
2302 err = 0;
2303 else if (!timeleft)
2304 err = -EIO; /* timed out */
2305 else
2306 err = timeleft; /* killed */
e1518c7c
SW		 2307 }
2308 dout("do_request waited, got %d\n", err);
2309 mutex_lock(&mdsc->mutex);
5b1daecd 2310
e1518c7c
SW		 2311 /* only abort if we didn't race with a real reply */
2312 if (req->r_got_result) {
2313 err = le32_to_cpu(req->r_reply_info.head->result);
2314 } else if (err < 0) {
2315 dout("aborted request %lld with %d\n", req->r_tid, err);
b4556396
SW		 2316
2317 /*
2318 * ensure we aren't running concurrently with
2319 * ceph_fill_trace or ceph_readdir_prepopulate, which
2320 * rely on locks (dir mutex) held by our caller.
2321 */
2322 mutex_lock(&req->r_fill_mutex);
e1518c7c
SW		 2323 req->r_err = err;
2324 req->r_aborted = true;
b4556396 2325 mutex_unlock(&req->r_fill_mutex);
5b1daecd 2326
e1518c7c 2327 if (req->r_locked_dir &&
167c9e35
SW		 2328 (req->r_op & CEPH_MDS_OP_WRITE))
2329 ceph_invalidate_dir_request(req);
2f2dc053 2330 } else {
e1518c7c 2331 err = req->r_err;
2f2dc053 2332 }
2f2dc053 2333
e1518c7c
SW		 2334out:
2335 mutex_unlock(&mdsc->mutex);
2f2dc053
SW		 2336 dout("do_request %p done, result %d\n", req, err);
2337 return err;
2338}
2339
167c9e35 2340/*
2f276c51 2341 * Invalidate dir's completeness, dentry lease state on an aborted MDS
167c9e35
SW		 2342 * namespace request.
2343 */
2344void ceph_invalidate_dir_request(struct ceph_mds_request *req)
2345{
2346 struct inode *inode = req->r_locked_dir;
167c9e35 2347
2f276c51 2348 dout("invalidate_dir_request %p (complete, lease(s))\n", inode);
167c9e35 2349
2f276c51 2350 ceph_dir_clear_complete(inode);
167c9e35
SW		 2351 if (req->r_dentry)
2352 ceph_invalidate_dentry_lease(req->r_dentry);
2353 if (req->r_old_dentry)
2354 ceph_invalidate_dentry_lease(req->r_old_dentry);
2355}
2356
2f2dc053
SW		 2357/*
2358 * Handle mds reply.
2359 *
2360 * We take the session mutex and parse and process the reply immediately.
2361 * This preserves the logical ordering of replies, capabilities, etc., sent
2362 * by the MDS as they are applied to our local cache.
2363 */
2364static void handle_reply(struct ceph_mds_session *session, struct ceph_msg *msg)
2365{
2366 struct ceph_mds_client *mdsc = session->s_mdsc;
2367 struct ceph_mds_request *req;
2368 struct ceph_mds_reply_head *head = msg->front.iov_base;
2369 struct ceph_mds_reply_info_parsed *rinfo; /* parsed reply info */
982d6011 2370 struct ceph_snap_realm *realm;
2f2dc053
SW		 2371 u64 tid;
2372 int err, result;
2600d2dd 2373 int mds = session->s_mds;
2f2dc053 2374
2f2dc053
SW		 2375 if (msg->front.iov_len < sizeof(*head)) {
2376 pr_err("mdsc_handle_reply got corrupt (short) reply\n");
9ec7cab1 2377 ceph_msg_dump(msg);
2f2dc053
SW		 2378 return;
2379 }
2380
2381 /* get request, session */
6df058c0 2382 tid = le64_to_cpu(msg->hdr.tid);
2f2dc053
SW		 2383 mutex_lock(&mdsc->mutex);
2384 req = __lookup_request(mdsc, tid);
2385 if (!req) {
2386 dout("handle_reply on unknown tid %llu\n", tid);
2387 mutex_unlock(&mdsc->mutex);
2388 return;
2389 }
2390 dout("handle_reply %p\n", req);
2f2dc053
SW		 2391
2392 /* correct session? */
d96d6049 2393 if (req->r_session != session) {
2f2dc053
SW		 2394 pr_err("mdsc_handle_reply got %llu on session mds%d"
2395 " not mds%d\n", tid, session->s_mds,
2396 req->r_session ? req->r_session->s_mds : -1);
2397 mutex_unlock(&mdsc->mutex);
2398 goto out;
2399 }
2400
2401 /* dup? */
2402 if ((req->r_got_unsafe && !head->safe) ||
2403 (req->r_got_safe && head->safe)) {
f3ae1b97 2404 pr_warn("got a dup %s reply on %llu from mds%d\n",
2f2dc053
SW		 2405 head->safe ? "safe" : "unsafe", tid, mds);
2406 mutex_unlock(&mdsc->mutex);
2407 goto out;
2408 }
85792d0d 2409 if (req->r_got_safe && !head->safe) {
f3ae1b97 2410 pr_warn("got unsafe after safe on %llu from mds%d\n",
85792d0d
SW		 2411 tid, mds);
2412 mutex_unlock(&mdsc->mutex);
2413 goto out;
2414 }
2f2dc053
SW		 2415
2416 result = le32_to_cpu(head->result);
2417
2418 /*
e55b71f8
GF		 2419 * Handle an ESTALE
2420 * if we're not talking to the authority, send to them
2421 * if the authority has changed while we weren't looking,
2422 * send to new authority
2423 * Otherwise we just have to return an ESTALE
2f2dc053
SW		 2424 */
2425 if (result == -ESTALE) {
e55b71f8 2426 dout("got ESTALE on request %llu", req->r_tid);
51da8e8c 2427 req->r_resend_mds = -1;
ca18bede 2428 if (req->r_direct_mode != USE_AUTH_MDS) {
e55b71f8
GF		 2429 dout("not using auth, setting for that now");
2430 req->r_direct_mode = USE_AUTH_MDS;
2f2dc053
SW		 2431 __do_request(mdsc, req);
2432 mutex_unlock(&mdsc->mutex);
2433 goto out;
e55b71f8 2434 } else {
ca18bede
YZ		 2435 int mds = __choose_mds(mdsc, req);
2436 if (mds >= 0 && mds != req->r_session->s_mds) {
2437 dout("but auth changed, so resending");
e55b71f8
GF		 2438 __do_request(mdsc, req);
2439 mutex_unlock(&mdsc->mutex);
2440 goto out;
2441 }
2f2dc053 2442 }
e55b71f8 2443 dout("have to return ESTALE on request %llu", req->r_tid);
2f2dc053
SW		 2444 }
2445
e55b71f8 2446
2f2dc053
SW		 2447 if (head->safe) {
2448 req->r_got_safe = true;
2449 __unregister_request(mdsc, req);
2f2dc053
SW		 2450
2451 if (req->r_got_unsafe) {
2452 /*
2453 * We already handled the unsafe response, now do the
2454 * cleanup. No need to examine the response; the MDS
2455 * doesn't include any result info in the safe
2456 * response. And even if it did, there is nothing
2457 * useful we could do with a revised return value.
2458 */
2459 dout("got safe reply %llu, mds%d\n", tid, mds);
2460 list_del_init(&req->r_unsafe_item);
2461
2462 /* last unsafe request during umount? */
44ca18f2 2463 if (mdsc->stopping && !__get_oldest_req(mdsc))
03066f23 2464 complete_all(&mdsc->safe_umount_waiters);
2f2dc053
SW		 2465 mutex_unlock(&mdsc->mutex);
2466 goto out;
2467 }
e1518c7c 2468 } else {
2f2dc053
SW		 2469 req->r_got_unsafe = true;
2470 list_add_tail(&req->r_unsafe_item, &req->r_session->s_unsafe);
2471 }
2472
2473 dout("handle_reply tid %lld result %d\n", tid, result);
2474 rinfo = &req->r_reply_info;
14303d20 2475 err = parse_reply_info(msg, rinfo, session->s_con.peer_features);
2f2dc053
SW		 2476 mutex_unlock(&mdsc->mutex);
2477
2478 mutex_lock(&session->s_mutex);
2479 if (err < 0) {
25933abd 2480 pr_err("mdsc_handle_reply got corrupt reply mds%d(tid:%lld)\n", mds, tid);
9ec7cab1 2481 ceph_msg_dump(msg);
2f2dc053
SW		 2482 goto out_err;
2483 }
2484
2485 /* snap trace */
982d6011 2486 realm = NULL;
2f2dc053
SW		 2487 if (rinfo->snapblob_len) {
2488 down_write(&mdsc->snap_rwsem);
2489 ceph_update_snap_trace(mdsc, rinfo->snapblob,
982d6011
YZ		 2490 rinfo->snapblob + rinfo->snapblob_len,
2491 le32_to_cpu(head->op) == CEPH_MDS_OP_RMSNAP,
2492 &realm);
2f2dc053
SW		 2493 downgrade_write(&mdsc->snap_rwsem);
2494 } else {
2495 down_read(&mdsc->snap_rwsem);
2496 }
2497
2498 /* insert trace into our cache */
b4556396 2499 mutex_lock(&req->r_fill_mutex);
3d14c5d2 2500 err = ceph_fill_trace(mdsc->fsc->sb, req, req->r_session);
2f2dc053 2501 if (err == 0) {
6e8575fa 2502 if (result == 0 && (req->r_op == CEPH_MDS_OP_READDIR ||
81c6aea5 2503 req->r_op == CEPH_MDS_OP_LSSNAP))
2f2dc053 2504 ceph_readdir_prepopulate(req, req->r_session);
37151668 2505 ceph_unreserve_caps(mdsc, &req->r_caps_reservation);
2f2dc053 2506 }
b4556396 2507 mutex_unlock(&req->r_fill_mutex);
2f2dc053
SW		 2508
2509 up_read(&mdsc->snap_rwsem);
982d6011
YZ		 2510 if (realm)
2511 ceph_put_snap_realm(mdsc, realm);
2f2dc053 2512out_err:
e1518c7c
SW		 2513 mutex_lock(&mdsc->mutex);
2514 if (!req->r_aborted) {
2515 if (err) {
2516 req->r_err = err;
2517 } else {
2518 req->r_reply = msg;
2519 ceph_msg_get(msg);
2520 req->r_got_result = true;
2521 }
2f2dc053 2522 } else {
e1518c7c 2523 dout("reply arrived after request %lld was aborted\n", tid);
2f2dc053 2524 }
e1518c7c 2525 mutex_unlock(&mdsc->mutex);
2f2dc053 2526
2f2dc053
SW		 2527 mutex_unlock(&session->s_mutex);
2528
2529 /* kick calling process */
2530 complete_request(mdsc, req);
2531out:
2532 ceph_mdsc_put_request(req);
2533 return;
2534}
2535
2536
2537
2538/*
2539 * handle mds notification that our request has been forwarded.
2540 */
2600d2dd
SW		 2541static void handle_forward(struct ceph_mds_client *mdsc,
2542 struct ceph_mds_session *session,
2543 struct ceph_msg *msg)
2f2dc053
SW		 2544{
2545 struct ceph_mds_request *req;
a1ea787c 2546 u64 tid = le64_to_cpu(msg->hdr.tid);
2f2dc053
SW		 2547 u32 next_mds;
2548 u32 fwd_seq;
2f2dc053
SW		 2549 int err = -EINVAL;
2550 void *p = msg->front.iov_base;
2551 void *end = p + msg->front.iov_len;
2f2dc053 2552
a1ea787c 2553 ceph_decode_need(&p, end, 2*sizeof(u32), bad);
c89136ea
SW		 2554 next_mds = ceph_decode_32(&p);
2555 fwd_seq = ceph_decode_32(&p);
2f2dc053
SW		 2556
2557 mutex_lock(&mdsc->mutex);
2558 req = __lookup_request(mdsc, tid);
2559 if (!req) {
2a8e5e36 2560 dout("forward tid %llu to mds%d - req dne\n", tid, next_mds);
2f2dc053
SW		 2561 goto out; /* dup reply? */
2562 }
2563
2a8e5e36
SW		 2564 if (req->r_aborted) {
2565 dout("forward tid %llu aborted, unregistering\n", tid);
2566 __unregister_request(mdsc, req);
2567 } else if (fwd_seq <= req->r_num_fwd) {
2568 dout("forward tid %llu to mds%d - old seq %d <= %d\n",
2f2dc053
SW		 2569 tid, next_mds, req->r_num_fwd, fwd_seq);
2570 } else {
2571 /* resend. forward race not possible; mds would drop */
2a8e5e36
SW		 2572 dout("forward tid %llu to mds%d (we resend)\n", tid, next_mds);
2573 BUG_ON(req->r_err);
2574 BUG_ON(req->r_got_result);
3de22be6 2575 req->r_attempts = 0;
2f2dc053
SW		 2576 req->r_num_fwd = fwd_seq;
2577 req->r_resend_mds = next_mds;
2578 put_request_session(req);
2579 __do_request(mdsc, req);
2580 }
2581 ceph_mdsc_put_request(req);
2582out:
2583 mutex_unlock(&mdsc->mutex);
2584 return;
2585
2586bad:
2587 pr_err("mdsc_handle_forward decode error err=%d\n", err);
2588}
2589
2590/*
2591 * handle a mds session control message
2592 */
2593static void handle_session(struct ceph_mds_session *session,
2594 struct ceph_msg *msg)
2595{
2596 struct ceph_mds_client *mdsc = session->s_mdsc;
2597 u32 op;
2598 u64 seq;
2600d2dd 2599 int mds = session->s_mds;
2f2dc053
SW		 2600 struct ceph_mds_session_head *h = msg->front.iov_base;
2601 int wake = 0;
2602
2f2dc053
SW		 2603 /* decode */
2604 if (msg->front.iov_len != sizeof(*h))
2605 goto bad;
2606 op = le32_to_cpu(h->op);
2607 seq = le64_to_cpu(h->seq);
2608
2609 mutex_lock(&mdsc->mutex);
2600d2dd
SW		 2610 if (op == CEPH_SESSION_CLOSE)
2611 __unregister_session(mdsc, session);
2f2dc053
SW		 2612 /* FIXME: this ttl calculation is generous */
2613 session->s_ttl = jiffies + HZ*mdsc->mdsmap->m_session_autoclose;
2614 mutex_unlock(&mdsc->mutex);
2615
2616 mutex_lock(&session->s_mutex);
2617
2618 dout("handle_session mds%d %s %p state %s seq %llu\n",
2619 mds, ceph_session_op_name(op), session,
a687ecaf 2620 ceph_session_state_name(session->s_state), seq);
2f2dc053
SW		 2621
2622 if (session->s_state == CEPH_MDS_SESSION_HUNG) {
2623 session->s_state = CEPH_MDS_SESSION_OPEN;
2624 pr_info("mds%d came back\n", session->s_mds);
2625 }
2626
2627 switch (op) {
2628 case CEPH_SESSION_OPEN:
29790f26
SW		 2629 if (session->s_state == CEPH_MDS_SESSION_RECONNECTING)
2630 pr_info("mds%d reconnect success\n", session->s_mds);
2f2dc053
SW		 2631 session->s_state = CEPH_MDS_SESSION_OPEN;
2632 renewed_caps(mdsc, session, 0);
2633 wake = 1;
2634 if (mdsc->stopping)
2635 __close_session(mdsc, session);
2636 break;
2637
2638 case CEPH_SESSION_RENEWCAPS:
2639 if (session->s_renew_seq == seq)
2640 renewed_caps(mdsc, session, 1);
2641 break;
2642
2643 case CEPH_SESSION_CLOSE:
29790f26
SW		 2644 if (session->s_state == CEPH_MDS_SESSION_RECONNECTING)
2645 pr_info("mds%d reconnect denied\n", session->s_mds);
1c841a96 2646 cleanup_session_requests(mdsc, session);
2f2dc053 2647 remove_session_caps(session);
656e4382 2648 wake = 2; /* for good measure */
f3c60c59 2649 wake_up_all(&mdsc->session_close_wq);
2f2dc053
SW		 2650 break;
2651
2652 case CEPH_SESSION_STALE:
2653 pr_info("mds%d caps went stale, renewing\n",
2654 session->s_mds);
d8fb02ab 2655 spin_lock(&session->s_gen_ttl_lock);
2f2dc053 2656 session->s_cap_gen++;
1ce208a6 2657 session->s_cap_ttl = jiffies - 1;
d8fb02ab 2658 spin_unlock(&session->s_gen_ttl_lock);
2f2dc053
SW		 2659 send_renew_caps(mdsc, session);
2660 break;
2661
2662 case CEPH_SESSION_RECALL_STATE:
2663 trim_caps(mdsc, session, le32_to_cpu(h->max_caps));
2664 break;
2665
186e4f7a
YZ		 2666 case CEPH_SESSION_FLUSHMSG:
2667 send_flushmsg_ack(mdsc, session, seq);
2668 break;
2669
03f4fcb0
YZ		 2670 case CEPH_SESSION_FORCE_RO:
2671 dout("force_session_readonly %p\n", session);
2672 spin_lock(&session->s_cap_lock);
2673 session->s_readonly = true;
2674 spin_unlock(&session->s_cap_lock);
2675 wake_up_session_caps(session, 0);
2676 break;
2677
2f2dc053
SW		 2678 default:
2679 pr_err("mdsc_handle_session bad op %d mds%d\n", op, mds);
2680 WARN_ON(1);
2681 }
2682
2683 mutex_unlock(&session->s_mutex);
2684 if (wake) {
2685 mutex_lock(&mdsc->mutex);
2686 __wake_requests(mdsc, &session->s_waiting);
656e4382
YZ		 2687 if (wake == 2)
2688 kick_requests(mdsc, mds);
2f2dc053
SW		 2689 mutex_unlock(&mdsc->mutex);
2690 }
2691 return;
2692
2693bad:
2694 pr_err("mdsc_handle_session corrupt message mds%d len %d\n", mds,
2695 (int)msg->front.iov_len);
9ec7cab1 2696 ceph_msg_dump(msg);
2f2dc053
SW		 2697 return;
2698}
2699
2700
2701/*
2702 * called under session->mutex.
2703 */
2704static void replay_unsafe_requests(struct ceph_mds_client *mdsc,
2705 struct ceph_mds_session *session)
2706{
2707 struct ceph_mds_request *req, *nreq;
3de22be6 2708 struct rb_node *p;
2f2dc053
SW		 2709 int err;
2710
2711 dout("replay_unsafe_requests mds%d\n", session->s_mds);
2712
2713 mutex_lock(&mdsc->mutex);
2714 list_for_each_entry_safe(req, nreq, &session->s_unsafe, r_unsafe_item) {
6e6f0923 2715 err = __prepare_send_request(mdsc, req, session->s_mds, true);
2f2dc053
SW		 2716 if (!err) {
2717 ceph_msg_get(req->r_request);
2718 ceph_con_send(&session->s_con, req->r_request);
2719 }
2720 }
3de22be6
YZ		 2721
2722 /*
2723 * also re-send old requests when MDS enters reconnect stage. So that MDS
2724 * can process completed request in clientreplay stage.
2725 */
2726 p = rb_first(&mdsc->request_tree);
2727 while (p) {
2728 req = rb_entry(p, struct ceph_mds_request, r_node);
2729 p = rb_next(p);
2730 if (req->r_got_unsafe)
2731 continue;
2732 if (req->r_attempts == 0)
2733 continue; /* only old requests */
2734 if (req->r_session &&
2735 req->r_session->s_mds == session->s_mds) {
6e6f0923
YZ		 2736 err = __prepare_send_request(mdsc, req,
2737 session->s_mds, true);
3de22be6
YZ		 2738 if (!err) {
2739 ceph_msg_get(req->r_request);
2740 ceph_con_send(&session->s_con, req->r_request);
2741 }
2742 }
2743 }
2f2dc053
SW		 2744 mutex_unlock(&mdsc->mutex);
2745}
2746
2747/*
2748 * Encode information about a cap for a reconnect with the MDS.
2749 */
2f2dc053
SW		 2750static int encode_caps_cb(struct inode *inode, struct ceph_cap *cap,
2751 void *arg)
2752{
20cb34ae
SW		 2753 union {
2754 struct ceph_mds_cap_reconnect v2;
2755 struct ceph_mds_cap_reconnect_v1 v1;
2756 } rec;
2757 size_t reclen;
2f2dc053 2758 struct ceph_inode_info *ci;
20cb34ae
SW		 2759 struct ceph_reconnect_state *recon_state = arg;
2760 struct ceph_pagelist *pagelist = recon_state->pagelist;
2f2dc053
SW		 2761 char *path;
2762 int pathlen, err;
2763 u64 pathbase;
2764 struct dentry *dentry;
2765
2766 ci = cap->ci;
2767
2768 dout(" adding %p ino %llx.%llx cap %p %lld %s\n",
2769 inode, ceph_vinop(inode), cap, cap->cap_id,
2770 ceph_cap_string(cap->issued));
93cea5be
SW		 2771 err = ceph_pagelist_encode_64(pagelist, ceph_ino(inode));
2772 if (err)
2773 return err;
2f2dc053
SW		 2774
2775 dentry = d_find_alias(inode);
2776 if (dentry) {
2777 path = ceph_mdsc_build_path(dentry, &pathlen, &pathbase, 0);
2778 if (IS_ERR(path)) {
2779 err = PTR_ERR(path);
e072f8aa 2780 goto out_dput;
2f2dc053
SW		 2781 }
2782 } else {
2783 path = NULL;
2784 pathlen = 0;
2785 }
93cea5be
SW		 2786 err = ceph_pagelist_encode_string(pagelist, path, pathlen);
2787 if (err)
e072f8aa 2788 goto out_free;
2f2dc053 2789
be655596 2790 spin_lock(&ci->i_ceph_lock);
2f2dc053
SW		 2791 cap->seq = 0; /* reset cap seq */
2792 cap->issue_seq = 0; /* and issue_seq */
667ca05c 2793 cap->mseq = 0; /* and migrate_seq */
99a9c273 2794 cap->cap_gen = cap->session->s_cap_gen;
20cb34ae
SW		 2795
2796 if (recon_state->flock) {
2797 rec.v2.cap_id = cpu_to_le64(cap->cap_id);
2798 rec.v2.wanted = cpu_to_le32(__ceph_caps_wanted(ci));
2799 rec.v2.issued = cpu_to_le32(cap->issued);
2800 rec.v2.snaprealm = cpu_to_le64(ci->i_snap_realm->ino);
2801 rec.v2.pathbase = cpu_to_le64(pathbase);
2802 rec.v2.flock_len = 0;
2803 reclen = sizeof(rec.v2);
2804 } else {
2805 rec.v1.cap_id = cpu_to_le64(cap->cap_id);
2806 rec.v1.wanted = cpu_to_le32(__ceph_caps_wanted(ci));
2807 rec.v1.issued = cpu_to_le32(cap->issued);
2808 rec.v1.size = cpu_to_le64(inode->i_size);
2809 ceph_encode_timespec(&rec.v1.mtime, &inode->i_mtime);
2810 ceph_encode_timespec(&rec.v1.atime, &inode->i_atime);
2811 rec.v1.snaprealm = cpu_to_le64(ci->i_snap_realm->ino);
2812 rec.v1.pathbase = cpu_to_le64(pathbase);
2813 reclen = sizeof(rec.v1);
2814 }
be655596 2815 spin_unlock(&ci->i_ceph_lock);
2f2dc053 2816
40819f6f
GF		 2817 if (recon_state->flock) {
2818 int num_fcntl_locks, num_flock_locks;
39be95e9
JS		 2819 struct ceph_filelock *flocks;
2820
2821encode_again:
39be95e9 2822 ceph_count_locks(inode, &num_fcntl_locks, &num_flock_locks);
39be95e9
JS		 2823 flocks = kmalloc((num_fcntl_locks+num_flock_locks) *
2824 sizeof(struct ceph_filelock), GFP_NOFS);
2825 if (!flocks) {
2826 err = -ENOMEM;
2827 goto out_free;
2828 }
39be95e9
JS		 2829 err = ceph_encode_locks_to_buffer(inode, flocks,
2830 num_fcntl_locks,
2831 num_flock_locks);
39be95e9
JS		 2832 if (err) {
2833 kfree(flocks);
2834 if (err == -ENOSPC)
2835 goto encode_again;
2836 goto out_free;
2837 }
2838 /*
2839 * number of encoded locks is stable, so copy to pagelist
2840 */
2841 rec.v2.flock_len = cpu_to_le32(2*sizeof(u32) +
2842 (num_fcntl_locks+num_flock_locks) *
2843 sizeof(struct ceph_filelock));
2844 err = ceph_pagelist_append(pagelist, &rec, reclen);
2845 if (!err)
2846 err = ceph_locks_to_pagelist(flocks, pagelist,
2847 num_fcntl_locks,
2848 num_flock_locks);
2849 kfree(flocks);
3612abbd
SW		 2850 } else {
2851 err = ceph_pagelist_append(pagelist, &rec, reclen);
40819f6f 2852 }
44c99757
YZ		 2853
2854 recon_state->nr_caps++;
e072f8aa 2855out_free:
2f2dc053 2856 kfree(path);
e072f8aa 2857out_dput:
2f2dc053 2858 dput(dentry);
93cea5be 2859 return err;
2f2dc053
SW		 2860}
2861
2862
2863/*
2864 * If an MDS fails and recovers, clients need to reconnect in order to
2865 * reestablish shared state. This includes all caps issued through
2866 * this session _and_ the snap_realm hierarchy. Because it's not
2867 * clear which snap realms the mds cares about, we send everything we
2868 * know about.. that ensures we'll then get any new info the
2869 * recovering MDS might have.
2870 *
2871 * This is a relatively heavyweight operation, but it's rare.
2872 *
2873 * called with mdsc->mutex held.
2874 */
34b6c855
SW		 2875static void send_mds_reconnect(struct ceph_mds_client *mdsc,
2876 struct ceph_mds_session *session)
2f2dc053 2877{
2f2dc053 2878 struct ceph_msg *reply;
a105f00c 2879 struct rb_node *p;
34b6c855 2880 int mds = session->s_mds;
9abf82b8 2881 int err = -ENOMEM;
44c99757 2882 int s_nr_caps;
93cea5be 2883 struct ceph_pagelist *pagelist;
20cb34ae 2884 struct ceph_reconnect_state recon_state;
2f2dc053 2885
34b6c855 2886 pr_info("mds%d reconnect start\n", mds);
2f2dc053 2887
93cea5be
SW		 2888 pagelist = kmalloc(sizeof(*pagelist), GFP_NOFS);
2889 if (!pagelist)
2890 goto fail_nopagelist;
2891 ceph_pagelist_init(pagelist);
2892
b61c2763 2893 reply = ceph_msg_new(CEPH_MSG_CLIENT_RECONNECT, 0, GFP_NOFS, false);
a79832f2 2894 if (!reply)
93cea5be 2895 goto fail_nomsg;
93cea5be 2896
34b6c855
SW		 2897 mutex_lock(&session->s_mutex);
2898 session->s_state = CEPH_MDS_SESSION_RECONNECTING;
2899 session->s_seq = 0;
2f2dc053 2900
2f2dc053 2901 dout("session %p state %s\n", session,
a687ecaf 2902 ceph_session_state_name(session->s_state));
2f2dc053 2903
99a9c273
YZ		 2904 spin_lock(&session->s_gen_ttl_lock);
2905 session->s_cap_gen++;
2906 spin_unlock(&session->s_gen_ttl_lock);
2907
2908 spin_lock(&session->s_cap_lock);
03f4fcb0
YZ		 2909 /* don't know if session is readonly */
2910 session->s_readonly = 0;
99a9c273
YZ		 2911 /*
2912 * notify __ceph_remove_cap() that we are composing cap reconnect.
2913 * If a cap get released before being added to the cap reconnect,
2914 * __ceph_remove_cap() should skip queuing cap release.
2915 */
2916 session->s_cap_reconnect = 1;
e01a5946 2917 /* drop old cap expires; we're about to reestablish that state */
745a8e3b 2918 cleanup_cap_releases(mdsc, session);
e01a5946 2919
5d23371f 2920 /* trim unused caps to reduce MDS's cache rejoin time */
c0bd50e2
YZ		 2921 if (mdsc->fsc->sb->s_root)
2922 shrink_dcache_parent(mdsc->fsc->sb->s_root);
5d23371f
YZ		 2923
2924 ceph_con_close(&session->s_con);
2925 ceph_con_open(&session->s_con,
2926 CEPH_ENTITY_TYPE_MDS, mds,
2927 ceph_mdsmap_get_addr(mdsc->mdsmap, mds));
2928
2929 /* replay unsafe requests */
2930 replay_unsafe_requests(mdsc, session);
2931
2932 down_read(&mdsc->snap_rwsem);
2933
2f2dc053 2934 /* traverse this session's caps */
44c99757
YZ		 2935 s_nr_caps = session->s_nr_caps;
2936 err = ceph_pagelist_encode_32(pagelist, s_nr_caps);
93cea5be
SW		 2937 if (err)
2938 goto fail;
20cb34ae 2939
44c99757 2940 recon_state.nr_caps = 0;
20cb34ae
SW		 2941 recon_state.pagelist = pagelist;
2942 recon_state.flock = session->s_con.peer_features & CEPH_FEATURE_FLOCK;
2943 err = iterate_session_caps(session, encode_caps_cb, &recon_state);
2f2dc053 2944 if (err < 0)
9abf82b8 2945 goto fail;
2f2dc053 2946
99a9c273
YZ		 2947 spin_lock(&session->s_cap_lock);
2948 session->s_cap_reconnect = 0;
2949 spin_unlock(&session->s_cap_lock);
2950
2f2dc053
SW		 2951 /*
2952 * snaprealms. we provide mds with the ino, seq (version), and
2953 * parent for all of our realms. If the mds has any newer info,
2954 * it will tell us.
2955 */
a105f00c
SW		 2956 for (p = rb_first(&mdsc->snap_realms); p; p = rb_next(p)) {
2957 struct ceph_snap_realm *realm =
2958 rb_entry(p, struct ceph_snap_realm, node);
93cea5be 2959 struct ceph_mds_snaprealm_reconnect sr_rec;
2f2dc053
SW		 2960
2961 dout(" adding snap realm %llx seq %lld parent %llx\n",
2962 realm->ino, realm->seq, realm->parent_ino);
93cea5be
SW		 2963 sr_rec.ino = cpu_to_le64(realm->ino);
2964 sr_rec.seq = cpu_to_le64(realm->seq);
2965 sr_rec.parent = cpu_to_le64(realm->parent_ino);
2966 err = ceph_pagelist_append(pagelist, &sr_rec, sizeof(sr_rec));
2967 if (err)
2968 goto fail;
2f2dc053 2969 }
2f2dc053 2970
20cb34ae
SW		 2971 if (recon_state.flock)
2972 reply->hdr.version = cpu_to_le16(2);
44c99757
YZ		 2973
2974 /* raced with cap release? */
2975 if (s_nr_caps != recon_state.nr_caps) {
2976 struct page *page = list_first_entry(&pagelist->head,
2977 struct page, lru);
2978 __le32 *addr = kmap_atomic(page);
2979 *addr = cpu_to_le32(recon_state.nr_caps);
2980 kunmap_atomic(addr);
ebf18f47 2981 }
44c99757
YZ		 2982
2983 reply->hdr.data_len = cpu_to_le32(pagelist->length);
2984 ceph_msg_data_add_pagelist(reply, pagelist);
e548e9b9
YZ		 2985
2986 ceph_early_kick_flushing_caps(mdsc, session);
2987
2f2dc053
SW		 2988 ceph_con_send(&session->s_con, reply);
2989
9abf82b8
SW		 2990 mutex_unlock(&session->s_mutex);
2991
2992 mutex_lock(&mdsc->mutex);
2993 __wake_requests(mdsc, &session->s_waiting);
2994 mutex_unlock(&mdsc->mutex);
2995
2f2dc053 2996 up_read(&mdsc->snap_rwsem);
2f2dc053
SW		 2997 return;
2998
93cea5be 2999fail:
2f2dc053 3000 ceph_msg_put(reply);
9abf82b8
SW		 3001 up_read(&mdsc->snap_rwsem);
3002 mutex_unlock(&session->s_mutex);
93cea5be
SW		 3003fail_nomsg:
3004 ceph_pagelist_release(pagelist);
93cea5be 3005fail_nopagelist:
9abf82b8 3006 pr_err("error %d preparing reconnect for mds%d\n", err, mds);
9abf82b8 3007 return;
2f2dc053
SW		 3008}
3009
3010
3011/*
3012 * compare old and new mdsmaps, kicking requests
3013 * and closing out old connections as necessary
3014 *
3015 * called under mdsc->mutex.
3016 */
3017static void check_new_map(struct ceph_mds_client *mdsc,
3018 struct ceph_mdsmap *newmap,
3019 struct ceph_mdsmap *oldmap)
3020{
3021 int i;
3022 int oldstate, newstate;
3023 struct ceph_mds_session *s;
3024
3025 dout("check_new_map new %u old %u\n",
3026 newmap->m_epoch, oldmap->m_epoch);
3027
3028 for (i = 0; i < oldmap->m_max_mds && i < mdsc->max_sessions; i++) {
3029 if (mdsc->sessions[i] == NULL)
3030 continue;
3031 s = mdsc->sessions[i];
3032 oldstate = ceph_mdsmap_get_state(oldmap, i);
3033 newstate = ceph_mdsmap_get_state(newmap, i);
3034
0deb01c9 3035 dout("check_new_map mds%d state %s%s -> %s%s (session %s)\n",
2f2dc053 3036 i, ceph_mds_state_name(oldstate),
0deb01c9 3037 ceph_mdsmap_is_laggy(oldmap, i) ? " (laggy)" : "",
2f2dc053 3038 ceph_mds_state_name(newstate),
0deb01c9 3039 ceph_mdsmap_is_laggy(newmap, i) ? " (laggy)" : "",
a687ecaf 3040 ceph_session_state_name(s->s_state));
2f2dc053 3041
3e8f43a0
YZ		 3042 if (i >= newmap->m_max_mds ||
3043 memcmp(ceph_mdsmap_get_addr(oldmap, i),
2f2dc053
SW		 3044 ceph_mdsmap_get_addr(newmap, i),
3045 sizeof(struct ceph_entity_addr))) {
3046 if (s->s_state == CEPH_MDS_SESSION_OPENING) {
3047 /* the session never opened, just close it
3048 * out now */
3049 __wake_requests(mdsc, &s->s_waiting);
2600d2dd 3050 __unregister_session(mdsc, s);
2f2dc053
SW		 3051 } else {
3052 /* just close it */
3053 mutex_unlock(&mdsc->mutex);
3054 mutex_lock(&s->s_mutex);
3055 mutex_lock(&mdsc->mutex);
3056 ceph_con_close(&s->s_con);
3057 mutex_unlock(&s->s_mutex);
3058 s->s_state = CEPH_MDS_SESSION_RESTARTING;
3059 }
2f2dc053
SW		 3060 } else if (oldstate == newstate) {
3061 continue; /* nothing new with this mds */
3062 }
3063
3064 /*
3065 * send reconnect?
3066 */
3067 if (s->s_state == CEPH_MDS_SESSION_RESTARTING &&
34b6c855
SW		 3068 newstate >= CEPH_MDS_STATE_RECONNECT) {
3069 mutex_unlock(&mdsc->mutex);
3070 send_mds_reconnect(mdsc, s);
3071 mutex_lock(&mdsc->mutex);
3072 }
2f2dc053
SW		 3073
3074 /*
29790f26 3075 * kick request on any mds that has gone active.
2f2dc053
SW		 3076 */
3077 if (oldstate < CEPH_MDS_STATE_ACTIVE &&
3078 newstate >= CEPH_MDS_STATE_ACTIVE) {
29790f26
SW		 3079 if (oldstate != CEPH_MDS_STATE_CREATING &&
3080 oldstate != CEPH_MDS_STATE_STARTING)
3081 pr_info("mds%d recovery completed\n", s->s_mds);
3082 kick_requests(mdsc, i);
2f2dc053 3083 ceph_kick_flushing_caps(mdsc, s);
0dc2570f 3084 wake_up_session_caps(s, 1);
2f2dc053
SW		 3085 }
3086 }
cb170a22
SW		 3087
3088 for (i = 0; i < newmap->m_max_mds && i < mdsc->max_sessions; i++) {
3089 s = mdsc->sessions[i];
3090 if (!s)
3091 continue;
3092 if (!ceph_mdsmap_is_laggy(newmap, i))
3093 continue;
3094 if (s->s_state == CEPH_MDS_SESSION_OPEN ||
3095 s->s_state == CEPH_MDS_SESSION_HUNG ||
3096 s->s_state == CEPH_MDS_SESSION_CLOSING) {
3097 dout(" connecting to export targets of laggy mds%d\n",
3098 i);
3099 __open_export_target_sessions(mdsc, s);
3100 }
3101 }
2f2dc053
SW		 3102}
3103
3104
3105
3106/*
3107 * leases
3108 */
3109
3110/*
3111 * caller must hold session s_mutex, dentry->d_lock
3112 */
3113void __ceph_mdsc_drop_dentry_lease(struct dentry *dentry)
3114{
3115 struct ceph_dentry_info *di = ceph_dentry(dentry);
3116
3117 ceph_put_mds_session(di->lease_session);
3118 di->lease_session = NULL;
3119}
3120
2600d2dd
SW		 3121static void handle_lease(struct ceph_mds_client *mdsc,
3122 struct ceph_mds_session *session,
3123 struct ceph_msg *msg)
2f2dc053 3124{
3d14c5d2 3125 struct super_block *sb = mdsc->fsc->sb;
2f2dc053 3126 struct inode *inode;
2f2dc053
SW		 3127 struct dentry *parent, *dentry;
3128 struct ceph_dentry_info *di;
2600d2dd 3129 int mds = session->s_mds;
2f2dc053 3130 struct ceph_mds_lease *h = msg->front.iov_base;
1e5ea23d 3131 u32 seq;
2f2dc053 3132 struct ceph_vino vino;
2f2dc053
SW		 3133 struct qstr dname;
3134 int release = 0;
3135
2f2dc053
SW		 3136 dout("handle_lease from mds%d\n", mds);
3137
3138 /* decode */
3139 if (msg->front.iov_len < sizeof(*h) + sizeof(u32))
3140 goto bad;
3141 vino.ino = le64_to_cpu(h->ino);
3142 vino.snap = CEPH_NOSNAP;
1e5ea23d 3143 seq = le32_to_cpu(h->seq);
2f2dc053
SW		 3144 dname.name = (void *)h + sizeof(*h) + sizeof(u32);
3145 dname.len = msg->front.iov_len - sizeof(*h) - sizeof(u32);
3146 if (dname.len != get_unaligned_le32(h+1))
3147 goto bad;
3148
2f2dc053
SW		 3149 /* lookup inode */
3150 inode = ceph_find_inode(sb, vino);
2f90b852
SW		 3151 dout("handle_lease %s, ino %llx %p %.*s\n",
3152 ceph_lease_op_name(h->action), vino.ino, inode,
1e5ea23d 3153 dname.len, dname.name);
6cd3bcad
YZ		 3154
3155 mutex_lock(&session->s_mutex);
3156 session->s_seq++;
3157
2f2dc053
SW		 3158 if (inode == NULL) {
3159 dout("handle_lease no inode %llx\n", vino.ino);
3160 goto release;
3161 }
2f2dc053
SW		 3162
3163 /* dentry */
3164 parent = d_find_alias(inode);
3165 if (!parent) {
3166 dout("no parent dentry on inode %p\n", inode);
3167 WARN_ON(1);
3168 goto release; /* hrm... */
3169 }
3170 dname.hash = full_name_hash(dname.name, dname.len);
3171 dentry = d_lookup(parent, &dname);
3172 dput(parent);
3173 if (!dentry)
3174 goto release;
3175
3176 spin_lock(&dentry->d_lock);
3177 di = ceph_dentry(dentry);
3178 switch (h->action) {
3179 case CEPH_MDS_LEASE_REVOKE:
3d8eb7a9 3180 if (di->lease_session == session) {
1e5ea23d
SW		 3181 if (ceph_seq_cmp(di->lease_seq, seq) > 0)
3182 h->seq = cpu_to_le32(di->lease_seq);
2f2dc053
SW		 3183 __ceph_mdsc_drop_dentry_lease(dentry);
3184 }
3185 release = 1;
3186 break;
3187
3188 case CEPH_MDS_LEASE_RENEW:
3d8eb7a9 3189 if (di->lease_session == session &&
2f2dc053
SW		 3190 di->lease_gen == session->s_cap_gen &&
3191 di->lease_renew_from &&
3192 di->lease_renew_after == 0) {
3193 unsigned long duration =
3563dbdd 3194 msecs_to_jiffies(le32_to_cpu(h->duration_ms));
2f2dc053 3195
1e5ea23d 3196 di->lease_seq = seq;
2f2dc053
SW		 3197 dentry->d_time = di->lease_renew_from + duration;
3198 di->lease_renew_after = di->lease_renew_from +
3199 (duration >> 1);
3200 di->lease_renew_from = 0;
3201 }
3202 break;
3203 }
3204 spin_unlock(&dentry->d_lock);
3205 dput(dentry);
3206
3207 if (!release)
3208 goto out;
3209
3210release:
3211 /* let's just reuse the same message */
3212 h->action = CEPH_MDS_LEASE_REVOKE_ACK;
3213 ceph_msg_get(msg);
3214 ceph_con_send(&session->s_con, msg);
3215
3216out:
3217 iput(inode);
3218 mutex_unlock(&session->s_mutex);
2f2dc053
SW		 3219 return;
3220
3221bad:
3222 pr_err("corrupt lease message\n");
9ec7cab1 3223 ceph_msg_dump(msg);
2f2dc053
SW		 3224}
3225
3226void ceph_mdsc_lease_send_msg(struct ceph_mds_session *session,
3227 struct inode *inode,
3228 struct dentry *dentry, char action,
3229 u32 seq)
3230{
3231 struct ceph_msg *msg;
3232 struct ceph_mds_lease *lease;
3233 int len = sizeof(*lease) + sizeof(u32);
3234 int dnamelen = 0;
3235
3236 dout("lease_send_msg inode %p dentry %p %s to mds%d\n",
3237 inode, dentry, ceph_lease_op_name(action), session->s_mds);
3238 dnamelen = dentry->d_name.len;
3239 len += dnamelen;
3240
b61c2763 3241 msg = ceph_msg_new(CEPH_MSG_CLIENT_LEASE, len, GFP_NOFS, false);
a79832f2 3242 if (!msg)
2f2dc053
SW		 3243 return;
3244 lease = msg->front.iov_base;
3245 lease->action = action;
2f2dc053
SW		 3246 lease->ino = cpu_to_le64(ceph_vino(inode).ino);
3247 lease->first = lease->last = cpu_to_le64(ceph_vino(inode).snap);
3248 lease->seq = cpu_to_le32(seq);
3249 put_unaligned_le32(dnamelen, lease + 1);
3250 memcpy((void *)(lease + 1) + 4, dentry->d_name.name, dnamelen);
3251
3252 /*
3253 * if this is a preemptive lease RELEASE, no need to
3254 * flush request stream, since the actual request will
3255 * soon follow.
3256 */
3257 msg->more_to_follow = (action == CEPH_MDS_LEASE_RELEASE);
3258
3259 ceph_con_send(&session->s_con, msg);
3260}
3261
3262/*
3263 * Preemptively release a lease we expect to invalidate anyway.
3264 * Pass @inode always, @dentry is optional.
3265 */
3266void ceph_mdsc_lease_release(struct ceph_mds_client *mdsc, struct inode *inode,
2f90b852 3267 struct dentry *dentry)
2f2dc053
SW		 3268{
3269 struct ceph_dentry_info *di;
3270 struct ceph_mds_session *session;
3271 u32 seq;
3272
3273 BUG_ON(inode == NULL);
3274 BUG_ON(dentry == NULL);
2f2dc053
SW		 3275
3276 /* is dentry lease valid? */
3277 spin_lock(&dentry->d_lock);
3278 di = ceph_dentry(dentry);
3279 if (!di || !di->lease_session ||
3280 di->lease_session->s_mds < 0 ||
3281 di->lease_gen != di->lease_session->s_cap_gen ||
3282 !time_before(jiffies, dentry->d_time)) {
3283 dout("lease_release inode %p dentry %p -- "
2f90b852
SW		 3284 "no lease\n",
3285 inode, dentry);
2f2dc053
SW		 3286 spin_unlock(&dentry->d_lock);
3287 return;
3288 }
3289
3290 /* we do have a lease on this dentry; note mds and seq */
3291 session = ceph_get_mds_session(di->lease_session);
3292 seq = di->lease_seq;
3293 __ceph_mdsc_drop_dentry_lease(dentry);
3294 spin_unlock(&dentry->d_lock);
3295
2f90b852
SW		 3296 dout("lease_release inode %p dentry %p to mds%d\n",
3297 inode, dentry, session->s_mds);
2f2dc053
SW		 3298 ceph_mdsc_lease_send_msg(session, inode, dentry,
3299 CEPH_MDS_LEASE_RELEASE, seq);
3300 ceph_put_mds_session(session);
3301}
3302
3303/*
3304 * drop all leases (and dentry refs) in preparation for umount
3305 */
3306static void drop_leases(struct ceph_mds_client *mdsc)
3307{
3308 int i;
3309
3310 dout("drop_leases\n");
3311 mutex_lock(&mdsc->mutex);
3312 for (i = 0; i < mdsc->max_sessions; i++) {
3313 struct ceph_mds_session *s = __ceph_lookup_mds_session(mdsc, i);
3314 if (!s)
3315 continue;
3316 mutex_unlock(&mdsc->mutex);
3317 mutex_lock(&s->s_mutex);
3318 mutex_unlock(&s->s_mutex);
3319 ceph_put_mds_session(s);
3320 mutex_lock(&mdsc->mutex);
3321 }
3322 mutex_unlock(&mdsc->mutex);
3323}
3324
3325
3326
3327/*
3328 * delayed work -- periodically trim expired leases, renew caps with mds
3329 */
3330static void schedule_delayed(struct ceph_mds_client *mdsc)
3331{
3332 int delay = 5;
3333 unsigned hz = round_jiffies_relative(HZ * delay);
3334 schedule_delayed_work(&mdsc->delayed_work, hz);
3335}
3336
3337static void delayed_work(struct work_struct *work)
3338{
3339 int i;
3340 struct ceph_mds_client *mdsc =
3341 container_of(work, struct ceph_mds_client, delayed_work.work);
3342 int renew_interval;
3343 int renew_caps;
3344
3345 dout("mdsc delayed_work\n");
afcdaea3 3346 ceph_check_delayed_caps(mdsc);
2f2dc053
SW		 3347
3348 mutex_lock(&mdsc->mutex);
3349 renew_interval = mdsc->mdsmap->m_session_timeout >> 2;
3350 renew_caps = time_after_eq(jiffies, HZ*renew_interval +
3351 mdsc->last_renew_caps);
3352 if (renew_caps)
3353 mdsc->last_renew_caps = jiffies;
3354
3355 for (i = 0; i < mdsc->max_sessions; i++) {
3356 struct ceph_mds_session *s = __ceph_lookup_mds_session(mdsc, i);
3357 if (s == NULL)
3358 continue;
3359 if (s->s_state == CEPH_MDS_SESSION_CLOSING) {
3360 dout("resending session close request for mds%d\n",
3361 s->s_mds);
3362 request_close_session(mdsc, s);
3363 ceph_put_mds_session(s);
3364 continue;
3365 }
3366 if (s->s_ttl && time_after(jiffies, s->s_ttl)) {
3367 if (s->s_state == CEPH_MDS_SESSION_OPEN) {
3368 s->s_state = CEPH_MDS_SESSION_HUNG;
3369 pr_info("mds%d hung\n", s->s_mds);
3370 }
3371 }
3372 if (s->s_state < CEPH_MDS_SESSION_OPEN) {
3373 /* this mds is failed or recovering, just wait */
3374 ceph_put_mds_session(s);
3375 continue;
3376 }
3377 mutex_unlock(&mdsc->mutex);
3378
3379 mutex_lock(&s->s_mutex);
3380 if (renew_caps)
3381 send_renew_caps(mdsc, s);
3382 else
3383 ceph_con_keepalive(&s->s_con);
aab53dd9
SW		 3384 if (s->s_state == CEPH_MDS_SESSION_OPEN ||
3385 s->s_state == CEPH_MDS_SESSION_HUNG)
3d7ded4d 3386 ceph_send_cap_releases(mdsc, s);
2f2dc053
SW		 3387 mutex_unlock(&s->s_mutex);
3388 ceph_put_mds_session(s);
3389
3390 mutex_lock(&mdsc->mutex);
3391 }
3392 mutex_unlock(&mdsc->mutex);
3393
3394 schedule_delayed(mdsc);
3395}
3396
3d14c5d2 3397int ceph_mdsc_init(struct ceph_fs_client *fsc)
2f2dc053 3398
2f2dc053 3399{
3d14c5d2
YS		 3400 struct ceph_mds_client *mdsc;
3401
3402 mdsc = kzalloc(sizeof(struct ceph_mds_client), GFP_NOFS);
3403 if (!mdsc)
3404 return -ENOMEM;
3405 mdsc->fsc = fsc;
3406 fsc->mdsc = mdsc;
2f2dc053
SW		 3407 mutex_init(&mdsc->mutex);
3408 mdsc->mdsmap = kzalloc(sizeof(*mdsc->mdsmap), GFP_NOFS);
fb3101b6 3409 if (mdsc->mdsmap == NULL) {
3410 kfree(mdsc);
2d06eeb8 3411 return -ENOMEM;
fb3101b6 3412 }
2d06eeb8 3413
2f2dc053 3414 init_completion(&mdsc->safe_umount_waiters);
f3c60c59 3415 init_waitqueue_head(&mdsc->session_close_wq);
2f2dc053
SW		 3416 INIT_LIST_HEAD(&mdsc->waiting_for_map);
3417 mdsc->sessions = NULL;
86d8f67b 3418 atomic_set(&mdsc->num_sessions, 0);
2f2dc053
SW		 3419 mdsc->max_sessions = 0;
3420 mdsc->stopping = 0;
affbc19a 3421 mdsc->last_snap_seq = 0;
2f2dc053 3422 init_rwsem(&mdsc->snap_rwsem);
a105f00c 3423 mdsc->snap_realms = RB_ROOT;
2f2dc053
SW		 3424 INIT_LIST_HEAD(&mdsc->snap_empty);
3425 spin_lock_init(&mdsc->snap_empty_lock);
3426 mdsc->last_tid = 0;
e8a7b8b1 3427 mdsc->oldest_tid = 0;
44ca18f2 3428 mdsc->request_tree = RB_ROOT;
2f2dc053
SW		 3429 INIT_DELAYED_WORK(&mdsc->delayed_work, delayed_work);
3430 mdsc->last_renew_caps = jiffies;
3431 INIT_LIST_HEAD(&mdsc->cap_delay_list);
3432 spin_lock_init(&mdsc->cap_delay_lock);
3433 INIT_LIST_HEAD(&mdsc->snap_flush_list);
3434 spin_lock_init(&mdsc->snap_flush_lock);
553adfd9 3435 mdsc->last_cap_flush_tid = 1;
8310b089 3436 mdsc->cap_flush_tree = RB_ROOT;
2f2dc053 3437 INIT_LIST_HEAD(&mdsc->cap_dirty);
db354052 3438 INIT_LIST_HEAD(&mdsc->cap_dirty_migrating);
2f2dc053
SW		 3439 mdsc->num_cap_flushing = 0;
3440 spin_lock_init(&mdsc->cap_dirty_lock);
3441 init_waitqueue_head(&mdsc->cap_flushing_wq);
3442 spin_lock_init(&mdsc->dentry_lru_lock);
3443 INIT_LIST_HEAD(&mdsc->dentry_lru);
2d06eeb8 3444
37151668 3445 ceph_caps_init(mdsc);
3d14c5d2 3446 ceph_adjust_min_caps(mdsc, fsc->min_caps);
37151668 3447
10183a69
YZ		 3448 init_rwsem(&mdsc->pool_perm_rwsem);
3449 mdsc->pool_perm_tree = RB_ROOT;
3450
5f44f142 3451 return 0;
2f2dc053
SW		 3452}
3453
3454/*
3455 * Wait for safe replies on open mds requests. If we time out, drop
3456 * all requests from the tree to avoid dangling dentry refs.
3457 */
3458static void wait_requests(struct ceph_mds_client *mdsc)
3459{
a319bf56 3460 struct ceph_options *opts = mdsc->fsc->client->options;
2f2dc053 3461 struct ceph_mds_request *req;
2f2dc053
SW		 3462
3463 mutex_lock(&mdsc->mutex);
44ca18f2 3464 if (__get_oldest_req(mdsc)) {
2f2dc053 3465 mutex_unlock(&mdsc->mutex);
44ca18f2 3466
2f2dc053
SW		 3467 dout("wait_requests waiting for requests\n");
3468 wait_for_completion_timeout(&mdsc->safe_umount_waiters,
a319bf56 3469 ceph_timeout_jiffies(opts->mount_timeout));
2f2dc053
SW		 3470
3471 /* tear down remaining requests */
44ca18f2
SW		 3472 mutex_lock(&mdsc->mutex);
3473 while ((req = __get_oldest_req(mdsc))) {
2f2dc053
SW		 3474 dout("wait_requests timed out on tid %llu\n",
3475 req->r_tid);
44ca18f2 3476 __unregister_request(mdsc, req);
2f2dc053
SW		 3477 }
3478 }
3479 mutex_unlock(&mdsc->mutex);
3480 dout("wait_requests done\n");
3481}
3482
3483/*
3484 * called before mount is ro, and before dentries are torn down.
3485 * (hmm, does this still race with new lookups?)
3486 */
3487void ceph_mdsc_pre_umount(struct ceph_mds_client *mdsc)
3488{
3489 dout("pre_umount\n");
3490 mdsc->stopping = 1;
3491
3492 drop_leases(mdsc);
afcdaea3 3493 ceph_flush_dirty_caps(mdsc);
2f2dc053 3494 wait_requests(mdsc);
17c688c3
SW		 3495
3496 /*
3497 * wait for reply handlers to drop their request refs and
3498 * their inode/dcache refs
3499 */
3500 ceph_msgr_flush();
2f2dc053
SW		 3501}
3502
3503/*
3504 * wait for all write mds requests to flush.
3505 */
3506static void wait_unsafe_requests(struct ceph_mds_client *mdsc, u64 want_tid)
3507{
80fc7314 3508 struct ceph_mds_request *req = NULL, *nextreq;
44ca18f2 3509 struct rb_node *n;
2f2dc053
SW		 3510
3511 mutex_lock(&mdsc->mutex);
3512 dout("wait_unsafe_requests want %lld\n", want_tid);
80fc7314 3513restart:
44ca18f2
SW		 3514 req = __get_oldest_req(mdsc);
3515 while (req && req->r_tid <= want_tid) {
80fc7314
SW		 3516 /* find next request */
3517 n = rb_next(&req->r_node);
3518 if (n)
3519 nextreq = rb_entry(n, struct ceph_mds_request, r_node);
3520 else
3521 nextreq = NULL;
e8a7b8b1
YZ		 3522 if (req->r_op != CEPH_MDS_OP_SETFILELOCK &&
3523 (req->r_op & CEPH_MDS_OP_WRITE)) {
44ca18f2
SW		 3524 /* write op */
3525 ceph_mdsc_get_request(req);
80fc7314
SW		 3526 if (nextreq)
3527 ceph_mdsc_get_request(nextreq);
44ca18f2
SW		 3528 mutex_unlock(&mdsc->mutex);
3529 dout("wait_unsafe_requests wait on %llu (want %llu)\n",
3530 req->r_tid, want_tid);
3531 wait_for_completion(&req->r_safe_completion);
3532 mutex_lock(&mdsc->mutex);
44ca18f2 3533 ceph_mdsc_put_request(req);
80fc7314
SW		 3534 if (!nextreq)
3535 break; /* next dne before, so we're done! */
3536 if (RB_EMPTY_NODE(&nextreq->r_node)) {
3537 /* next request was removed from tree */
3538 ceph_mdsc_put_request(nextreq);
3539 goto restart;
3540 }
3541 ceph_mdsc_put_request(nextreq); /* won't go away */
44ca18f2 3542 }
80fc7314 3543 req = nextreq;
2f2dc053
SW		 3544 }
3545 mutex_unlock(&mdsc->mutex);
3546 dout("wait_unsafe_requests done\n");
3547}
3548
3549void ceph_mdsc_sync(struct ceph_mds_client *mdsc)
3550{
affbc19a 3551 u64 want_tid, want_flush, want_snap;
2f2dc053 3552
3d14c5d2 3553 if (mdsc->fsc->mount_state == CEPH_MOUNT_SHUTDOWN)
56b7cf95
SW		 3554 return;
3555
2f2dc053
SW		 3556 dout("sync\n");
3557 mutex_lock(&mdsc->mutex);
3558 want_tid = mdsc->last_tid;
2f2dc053 3559 mutex_unlock(&mdsc->mutex);
2f2dc053 3560
afcdaea3 3561 ceph_flush_dirty_caps(mdsc);
d3383a8e 3562 spin_lock(&mdsc->cap_dirty_lock);
8310b089 3563 want_flush = mdsc->last_cap_flush_tid;
d3383a8e
YZ		 3564 spin_unlock(&mdsc->cap_dirty_lock);
3565
affbc19a
YZ		 3566 down_read(&mdsc->snap_rwsem);
3567 want_snap = mdsc->last_snap_seq;
3568 up_read(&mdsc->snap_rwsem);
3569
3570 dout("sync want tid %lld flush_seq %lld snap_seq %lld\n",
3571 want_tid, want_flush, want_snap);
2f2dc053
SW		 3572
3573 wait_unsafe_requests(mdsc, want_tid);
affbc19a 3574 wait_caps_flush(mdsc, want_flush, want_snap);
2f2dc053
SW		 3575}
3576
f3c60c59
SW		 3577/*
3578 * true if all sessions are closed, or we force unmount
3579 */
7fd7d101 3580static bool done_closing_sessions(struct ceph_mds_client *mdsc)
f3c60c59 3581{
3d14c5d2 3582 if (mdsc->fsc->mount_state == CEPH_MOUNT_SHUTDOWN)
f3c60c59 3583 return true;
86d8f67b 3584 return atomic_read(&mdsc->num_sessions) == 0;
f3c60c59 3585}
2f2dc053
SW		 3586
3587/*
3588 * called after sb is ro.
3589 */
3590void ceph_mdsc_close_sessions(struct ceph_mds_client *mdsc)
3591{
a319bf56 3592 struct ceph_options *opts = mdsc->fsc->client->options;
2f2dc053
SW		 3593 struct ceph_mds_session *session;
3594 int i;
2f2dc053
SW		 3595
3596 dout("close_sessions\n");
3597
2f2dc053 3598 /* close sessions */
f3c60c59
SW		 3599 mutex_lock(&mdsc->mutex);
3600 for (i = 0; i < mdsc->max_sessions; i++) {
3601 session = __ceph_lookup_mds_session(mdsc, i);
3602 if (!session)
3603 continue;
2f2dc053 3604 mutex_unlock(&mdsc->mutex);
f3c60c59
SW		 3605 mutex_lock(&session->s_mutex);
3606 __close_session(mdsc, session);
3607 mutex_unlock(&session->s_mutex);
3608 ceph_put_mds_session(session);
2f2dc053
SW		 3609 mutex_lock(&mdsc->mutex);
3610 }
f3c60c59
SW		 3611 mutex_unlock(&mdsc->mutex);
3612
3613 dout("waiting for sessions to close\n");
3614 wait_event_timeout(mdsc->session_close_wq, done_closing_sessions(mdsc),
a319bf56 3615 ceph_timeout_jiffies(opts->mount_timeout));
2f2dc053
SW		 3616
3617 /* tear down remaining sessions */
f3c60c59 3618 mutex_lock(&mdsc->mutex);
2f2dc053
SW		 3619 for (i = 0; i < mdsc->max_sessions; i++) {
3620 if (mdsc->sessions[i]) {
3621 session = get_session(mdsc->sessions[i]);
2600d2dd 3622 __unregister_session(mdsc, session);
2f2dc053
SW		 3623 mutex_unlock(&mdsc->mutex);
3624 mutex_lock(&session->s_mutex);
3625 remove_session_caps(session);
3626 mutex_unlock(&session->s_mutex);
3627 ceph_put_mds_session(session);
3628 mutex_lock(&mdsc->mutex);
3629 }
3630 }
2f2dc053 3631 WARN_ON(!list_empty(&mdsc->cap_delay_list));
2f2dc053
SW		 3632 mutex_unlock(&mdsc->mutex);
3633
3634 ceph_cleanup_empty_realms(mdsc);
3635
3636 cancel_delayed_work_sync(&mdsc->delayed_work); /* cancel timer */
3637
3638 dout("stopped\n");
3639}
3640
3d14c5d2 3641static void ceph_mdsc_stop(struct ceph_mds_client *mdsc)
2f2dc053
SW		 3642{
3643 dout("stop\n");
3644 cancel_delayed_work_sync(&mdsc->delayed_work); /* cancel timer */
3645 if (mdsc->mdsmap)
3646 ceph_mdsmap_destroy(mdsc->mdsmap);
3647 kfree(mdsc->sessions);
37151668 3648 ceph_caps_finalize(mdsc);
10183a69 3649 ceph_pool_perm_destroy(mdsc);
2f2dc053
SW		 3650}
3651
3d14c5d2
YS		 3652void ceph_mdsc_destroy(struct ceph_fs_client *fsc)
3653{
3654 struct ceph_mds_client *mdsc = fsc->mdsc;
3655
ef550f6f 3656 dout("mdsc_destroy %p\n", mdsc);
3d14c5d2 3657 ceph_mdsc_stop(mdsc);
ef550f6f
SW		 3658
3659 /* flush out any connection work with references to us */
3660 ceph_msgr_flush();
3661
3d14c5d2
YS		 3662 fsc->mdsc = NULL;
3663 kfree(mdsc);
ef550f6f 3664 dout("mdsc_destroy %p done\n", mdsc);
3d14c5d2
YS		 3665}
3666
2f2dc053
SW		 3667
3668/*
3669 * handle mds map update.
3670 */
3671void ceph_mdsc_handle_map(struct ceph_mds_client *mdsc, struct ceph_msg *msg)
3672{
3673 u32 epoch;
3674 u32 maplen;
3675 void *p = msg->front.iov_base;
3676 void *end = p + msg->front.iov_len;
3677 struct ceph_mdsmap *newmap, *oldmap;
3678 struct ceph_fsid fsid;
3679 int err = -EINVAL;
3680
3681 ceph_decode_need(&p, end, sizeof(fsid)+2*sizeof(u32), bad);
3682 ceph_decode_copy(&p, &fsid, sizeof(fsid));
3d14c5d2 3683 if (ceph_check_fsid(mdsc->fsc->client, &fsid) < 0)
0743304d 3684 return;
c89136ea
SW		 3685 epoch = ceph_decode_32(&p);
3686 maplen = ceph_decode_32(&p);
2f2dc053
SW		 3687 dout("handle_map epoch %u len %d\n", epoch, (int)maplen);
3688
3689 /* do we need it? */
3d14c5d2 3690 ceph_monc_got_mdsmap(&mdsc->fsc->client->monc, epoch);
2f2dc053
SW		 3691 mutex_lock(&mdsc->mutex);
3692 if (mdsc->mdsmap && epoch <= mdsc->mdsmap->m_epoch) {
3693 dout("handle_map epoch %u <= our %u\n",
3694 epoch, mdsc->mdsmap->m_epoch);
3695 mutex_unlock(&mdsc->mutex);
3696 return;
3697 }
3698
3699 newmap = ceph_mdsmap_decode(&p, end);
3700 if (IS_ERR(newmap)) {
3701 err = PTR_ERR(newmap);
3702 goto bad_unlock;
3703 }
3704
3705 /* swap into place */
3706 if (mdsc->mdsmap) {
3707 oldmap = mdsc->mdsmap;
3708 mdsc->mdsmap = newmap;
3709 check_new_map(mdsc, newmap, oldmap);
3710 ceph_mdsmap_destroy(oldmap);
3711 } else {
3712 mdsc->mdsmap = newmap; /* first mds map */
3713 }
3d14c5d2 3714 mdsc->fsc->sb->s_maxbytes = mdsc->mdsmap->m_max_file_size;
2f2dc053
SW		 3715
3716 __wake_requests(mdsc, &mdsc->waiting_for_map);
3717
3718 mutex_unlock(&mdsc->mutex);
3719 schedule_delayed(mdsc);
3720 return;
3721
3722bad_unlock:
3723 mutex_unlock(&mdsc->mutex);
3724bad:
3725 pr_err("error decoding mdsmap %d\n", err);
3726 return;
3727}
3728
3729static struct ceph_connection *con_get(struct ceph_connection *con)
3730{
3731 struct ceph_mds_session *s = con->private;
3732
3733 if (get_session(s)) {
2600d2dd 3734 dout("mdsc con_get %p ok (%d)\n", s, atomic_read(&s->s_ref));
2f2dc053
SW		 3735 return con;
3736 }
3737 dout("mdsc con_get %p FAIL\n", s);
3738 return NULL;
3739}
3740
3741static void con_put(struct ceph_connection *con)
3742{
3743 struct ceph_mds_session *s = con->private;
3744
7d8e18a6 3745 dout("mdsc con_put %p (%d)\n", s, atomic_read(&s->s_ref) - 1);
2f2dc053
SW		 3746 ceph_put_mds_session(s);
3747}
3748
3749/*
3750 * if the client is unresponsive for long enough, the mds will kill
3751 * the session entirely.
3752 */
3753static void peer_reset(struct ceph_connection *con)
3754{
3755 struct ceph_mds_session *s = con->private;
7e70f0ed 3756 struct ceph_mds_client *mdsc = s->s_mdsc;
2f2dc053 3757
f3ae1b97 3758 pr_warn("mds%d closed our session\n", s->s_mds);
7e70f0ed 3759 send_mds_reconnect(mdsc, s);
2f2dc053
SW		 3760}
3761
3762static void dispatch(struct ceph_connection *con, struct ceph_msg *msg)
3763{
3764 struct ceph_mds_session *s = con->private;
3765 struct ceph_mds_client *mdsc = s->s_mdsc;
3766 int type = le16_to_cpu(msg->hdr.type);
3767
2600d2dd
SW		 3768 mutex_lock(&mdsc->mutex);
3769 if (__verify_registered_session(mdsc, s) < 0) {
3770 mutex_unlock(&mdsc->mutex);
3771 goto out;
3772 }
3773 mutex_unlock(&mdsc->mutex);
3774
2f2dc053
SW		 3775 switch (type) {
3776 case CEPH_MSG_MDS_MAP:
3777 ceph_mdsc_handle_map(mdsc, msg);
3778 break;
3779 case CEPH_MSG_CLIENT_SESSION:
3780 handle_session(s, msg);
3781 break;
3782 case CEPH_MSG_CLIENT_REPLY:
3783 handle_reply(s, msg);
3784 break;
3785 case CEPH_MSG_CLIENT_REQUEST_FORWARD:
2600d2dd 3786 handle_forward(mdsc, s, msg);
2f2dc053
SW		 3787 break;
3788 case CEPH_MSG_CLIENT_CAPS:
3789 ceph_handle_caps(s, msg);
3790 break;
3791 case CEPH_MSG_CLIENT_SNAP:
2600d2dd 3792 ceph_handle_snap(mdsc, s, msg);
2f2dc053
SW		 3793 break;
3794 case CEPH_MSG_CLIENT_LEASE:
2600d2dd 3795 handle_lease(mdsc, s, msg);
2f2dc053
SW		 3796 break;
3797
3798 default:
3799 pr_err("received unknown message type %d %s\n", type,
3800 ceph_msg_type_name(type));
3801 }
2600d2dd 3802out:
2f2dc053
SW		 3803 ceph_msg_put(msg);
3804}
3805
4e7a5dcd
SW		 3806/*
3807 * authentication
3808 */
a3530df3
AE		 3809
3810/*
3811 * Note: returned pointer is the address of a structure that's
3812 * managed separately. Caller must *not* attempt to free it.
3813 */
3814static struct ceph_auth_handshake *get_authorizer(struct ceph_connection *con,
8f43fb53 3815 int *proto, int force_new)
4e7a5dcd
SW		 3816{
3817 struct ceph_mds_session *s = con->private;
3818 struct ceph_mds_client *mdsc = s->s_mdsc;
3d14c5d2 3819 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
74f1869f 3820 struct ceph_auth_handshake *auth = &s->s_auth;
4e7a5dcd 3821
74f1869f 3822 if (force_new && auth->authorizer) {
27859f97 3823 ceph_auth_destroy_authorizer(ac, auth->authorizer);
74f1869f 3824 auth->authorizer = NULL;
4e7a5dcd 3825 }
27859f97
SW		 3826 if (!auth->authorizer) {
3827 int ret = ceph_auth_create_authorizer(ac, CEPH_ENTITY_TYPE_MDS,
3828 auth);
0bed9b5c
SW		 3829 if (ret)
3830 return ERR_PTR(ret);
27859f97
SW		 3831 } else {
3832 int ret = ceph_auth_update_authorizer(ac, CEPH_ENTITY_TYPE_MDS,
3833 auth);
a255651d 3834 if (ret)
a3530df3 3835 return ERR_PTR(ret);
4e7a5dcd 3836 }
4e7a5dcd 3837 *proto = ac->protocol;
74f1869f 3838
a3530df3 3839 return auth;
4e7a5dcd
SW		 3840}
3841
3842
3843static int verify_authorizer_reply(struct ceph_connection *con, int len)
3844{
3845 struct ceph_mds_session *s = con->private;
3846 struct ceph_mds_client *mdsc = s->s_mdsc;
3d14c5d2 3847 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
4e7a5dcd 3848
27859f97 3849 return ceph_auth_verify_authorizer_reply(ac, s->s_auth.authorizer, len);
4e7a5dcd
SW		 3850}
3851
9bd2e6f8
SW		 3852static int invalidate_authorizer(struct ceph_connection *con)
3853{
3854 struct ceph_mds_session *s = con->private;
3855 struct ceph_mds_client *mdsc = s->s_mdsc;
3d14c5d2 3856 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
9bd2e6f8 3857
27859f97 3858 ceph_auth_invalidate_authorizer(ac, CEPH_ENTITY_TYPE_MDS);
9bd2e6f8 3859
3d14c5d2 3860 return ceph_monc_validate_auth(&mdsc->fsc->client->monc);
9bd2e6f8
SW		 3861}
3862
53ded495
AE		 3863static struct ceph_msg *mds_alloc_msg(struct ceph_connection *con,
3864 struct ceph_msg_header *hdr, int *skip)
3865{
3866 struct ceph_msg *msg;
3867 int type = (int) le16_to_cpu(hdr->type);
3868 int front_len = (int) le32_to_cpu(hdr->front_len);
3869
3870 if (con->in_msg)
3871 return con->in_msg;
3872
3873 *skip = 0;
3874 msg = ceph_msg_new(type, front_len, GFP_NOFS, false);
3875 if (!msg) {
3876 pr_err("unable to allocate msg type %d len %d\n",
3877 type, front_len);
3878 return NULL;
3879 }
53ded495
AE		 3880
3881 return msg;
3882}
3883
33d07337
YZ		 3884static int sign_message(struct ceph_connection *con, struct ceph_msg *msg)
3885{
3886 struct ceph_mds_session *s = con->private;
3887 struct ceph_auth_handshake *auth = &s->s_auth;
3888 return ceph_auth_sign_message(auth, msg);
3889}
3890
3891static int check_message_signature(struct ceph_connection *con, struct ceph_msg *msg)
3892{
3893 struct ceph_mds_session *s = con->private;
3894 struct ceph_auth_handshake *auth = &s->s_auth;
3895 return ceph_auth_check_message_signature(auth, msg);
3896}
3897
9e32789f 3898static const struct ceph_connection_operations mds_con_ops = {
2f2dc053
SW		 3899 .get = con_get,
3900 .put = con_put,
3901 .dispatch = dispatch,
4e7a5dcd
SW		 3902 .get_authorizer = get_authorizer,
3903 .verify_authorizer_reply = verify_authorizer_reply,
9bd2e6f8 3904 .invalidate_authorizer = invalidate_authorizer,
2f2dc053 3905 .peer_reset = peer_reset,
53ded495 3906 .alloc_msg = mds_alloc_msg,
33d07337
YZ		 3907 .sign_message = sign_message,
3908 .check_message_signature = check_message_signature,
2f2dc053
SW		 3909};
3910
2f2dc053 3911/* eof */
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